[PATCH md-6.12 00/41] md/md-bitmap: introduce bitmap_operations and make structure internel

[PATCH md-6.12 00/41] md/md-bitmap: introduce bitmap_operations and make structure internel

[Yu Kuai]

From: Yu Kuai <yukuai3@huawei.com>

Changes from RFC v1:
 - add patch 1-8 to prevent dereference bitmap directly, and the last
 patch to make bitmap structure internel.
 - use plain function alls "bitmap_ops->xxx()" directly;

Changes from RFC v2:
 - some coding style.

The background is that currently bitmap is using a global spin_lock,
cauing lock contention and huge IO performance degration for all raid
levels.

However, it's impossible to implement a new lock free bitmap with
current situation that md-bitmap exposes the internal implementation
with lots of exported apis. Hence bitmap_operations is invented, to
describe bitmap core implementation, and a new bitmap can be introduced
with a new bitmap_operations, we only need to switch to the new one
during initialization.

And with this we can build bitmap as kernel module, but that's not
our concern for now.

This version was tested with mdadm tests. There are still few failed
tests in my VM, howerver, it's the test itself need to be fixed and
we're working on it.

Yu Kuai (41):
  md/raid1: use md_bitmap_wait_behind_writes() in raid1_read_request()
  md/md-bitmap: replace md_bitmap_status() with a new helper
    md_bitmap_get_stats()
  md: use new helper md_bitmap_get_stats() in update_array_info()
  md/md-bitmap: add 'events_cleared' into struct md_bitmap_stats
  md/md-bitmap: add 'sync_size' into struct md_bitmap_stats
  md/md-bitmap: add 'file_pages' into struct md_bitmap_stats
  md/md-bitmap: add 'behind_writes' and 'behind_wait' into struct
    md_bitmap_stats
  md/md-cluster: use helper md_bitmap_get_stats() to get pages in
    resize_bitmaps()
  md/md-bitmap: add a new helper md_bitmap_set_pages()
  md/md-bitmap: introduce struct bitmap_operations
  md/md-bitmap: simplify md_bitmap_create() + md_bitmap_load()
  md/md-bitmap: merge md_bitmap_create() into bitmap_operations
  md/md-bitmap: merge md_bitmap_load() into bitmap_operations
  md/md-bitmap: merge md_bitmap_destroy() into bitmap_operations
  md/md-bitmap: merge md_bitmap_flush() into bitmap_operations
  md/md-bitmap: make md_bitmap_print_sb() internal
  md/md-bitmap: merge md_bitmap_update_sb() into bitmap_operations
  md/md-bitmap: merge md_bitmap_status() into bitmap_operations
  md/md-bitmap: remove md_bitmap_setallbits()
  md/md-bitmap: merge bitmap_write_all() into bitmap_operations
  md/md-bitmap: merge md_bitmap_dirty_bits() into bitmap_operations
  md/md-bitmap: merge md_bitmap_startwrite() into bitmap_operations
  md/md-bitmap: merge md_bitmap_endwrite() into bitmap_operations
  md/md-bitmap: merge md_bitmap_start_sync() into bitmap_operations
  md/md-bitmap: remove the parameter 'aborted' for md_bitmap_end_sync()
  md/md-bitmap: merge md_bitmap_end_sync() into bitmap_operations
  md/md-bitmap: merge md_bitmap_close_sync() into bitmap_operations
  md/md-bitmap: mrege md_bitmap_cond_end_sync() into bitmap_operations
  md/md-bitmap: merge md_bitmap_sync_with_cluster() into
    bitmap_operations
  md/md-bitmap: merge md_bitmap_unplug_async() into md_bitmap_unplug()
  md/md-bitmap: merge bitmap_unplug() into bitmap_operations
  md/md-bitmap: merge md_bitmap_daemon_work() into bitmap_operations
  md/md-bitmap: pass in mddev directly for md_bitmap_resize()
  md/md-bitmap: merge md_bitmap_resize() into bitmap_operations
  md/md-bitmap: merge get_bitmap_from_slot() into bitmap_operations
  md/md-bitmap: merge md_bitmap_copy_from_slot() into struct
    bitmap_operation.
  md/md-bitmap: merge md_bitmap_set_pages() into struct
    bitmap_operations
  md/md-bitmap: merge md_bitmap_free() into bitmap_operations
  md/md-bitmap: merge md_bitmap_wait_behind_writes() into
    bitmap_operations
  md/md-bitmap: merge md_bitmap_enabled() into bitmap_operations
  md/md-bitmap: make in memory structure internal

 drivers/md/dm-raid.c     |   7 +-
 drivers/md/md-bitmap.c   | 560 +++++++++++++++++++++++++++++----------
 drivers/md/md-bitmap.h   | 268 ++++---------------
 drivers/md/md-cluster.c  |  91 ++++---
 drivers/md/md.c          | 155 +++++++----
 drivers/md/md.h          |   3 +-
 drivers/md/raid1-10.c    |   9 +-
 drivers/md/raid1.c       |  78 +++---
 drivers/md/raid10.c      |  73 ++---
 drivers/md/raid5-cache.c |   8 +-
 drivers/md/raid5.c       |  62 ++---
 11 files changed, 752 insertions(+), 562 deletions(-)

-- 
2.39.2

[PATCH md-6.12 01/41] md/raid1: use md_bitmap_wait_behind_writes() in raid1_read_request()

[Yu Kuai]

From: Yu Kuai <yukuai3@huawei.com>

Use the existed helper instead of open coding it to make the code cleaner.
There are no functional changes, and also avoid dereferencing bitmap
directly to prepare inventing a new bitmap.

Noted that this patch also export md_bitmap_wait_behind_writes(), which
is necessary for now, and the exported api will be removed in following
patches to convert bitmap apis into ops.

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
---
 drivers/md/md-bitmap.c | 1 +
 drivers/md/raid1.c     | 7 ++-----
 2 files changed, 3 insertions(+), 5 deletions(-)

diff --git a/drivers/md/md-bitmap.c b/drivers/md/md-bitmap.c
index 08232d8dc815..08743dcc70f1 100644
--- a/drivers/md/md-bitmap.c
+++ b/drivers/md/md-bitmap.c
@@ -1851,6 +1851,7 @@ void md_bitmap_wait_behind_writes(struct mddev *mddev)
 			   atomic_read(&bitmap->behind_writes) == 0);
 	}
 }
+EXPORT_SYMBOL_GPL(md_bitmap_wait_behind_writes);
 
 void md_bitmap_destroy(struct mddev *mddev)
 {
diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index 7acfe7c9dc8d..81fc100e7830 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -1311,7 +1311,6 @@ static void raid1_read_request(struct mddev *mddev, struct bio *bio,
 	struct r1conf *conf = mddev->private;
 	struct raid1_info *mirror;
 	struct bio *read_bio;
-	struct bitmap *bitmap = mddev->bitmap;
 	const enum req_op op = bio_op(bio);
 	const blk_opf_t do_sync = bio->bi_opf & REQ_SYNC;
 	int max_sectors;
@@ -1377,15 +1376,13 @@ static void raid1_read_request(struct mddev *mddev, struct bio *bio,
 				    (unsigned long long)r1_bio->sector,
 				    mirror->rdev->bdev);
 
-	if (test_bit(WriteMostly, &mirror->rdev->flags) &&
-	    bitmap) {
+	if (test_bit(WriteMostly, &mirror->rdev->flags)) {
 		/*
 		 * Reading from a write-mostly device must take care not to
 		 * over-take any writes that are 'behind'
 		 */
 		mddev_add_trace_msg(mddev, "raid1 wait behind writes");
-		wait_event(bitmap->behind_wait,
-			   atomic_read(&bitmap->behind_writes) == 0);
+		md_bitmap_wait_behind_writes(mddev);
 	}
 
 	if (max_sectors < bio_sectors(bio)) {
-- 
2.39.2

[PATCH md-6.12 02/41] md/md-bitmap: replace md_bitmap_status() with a new helper md_bitmap_get_stats()

[Yu Kuai]

From: Yu Kuai <yukuai3@huawei.com>

There are no functional changes, and the new helper will be used in
multiple places in following patches to avoid dereferencing bitmap
directly.

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
---
 drivers/md/md-bitmap.c | 25 ++++++-------------------
 drivers/md/md-bitmap.h |  8 +++++++-
 drivers/md/md.c        | 29 ++++++++++++++++++++++++++++-
 3 files changed, 41 insertions(+), 21 deletions(-)

diff --git a/drivers/md/md-bitmap.c b/drivers/md/md-bitmap.c
index 08743dcc70f1..66ebe12d80ae 100644
--- a/drivers/md/md-bitmap.c
+++ b/drivers/md/md-bitmap.c
@@ -2094,32 +2094,19 @@ int md_bitmap_copy_from_slot(struct mddev *mddev, int slot,
 }
 EXPORT_SYMBOL_GPL(md_bitmap_copy_from_slot);
 
-
-void md_bitmap_status(struct seq_file *seq, struct bitmap *bitmap)
+int md_bitmap_get_stats(struct bitmap *bitmap, struct md_bitmap_stats *stats)
 {
-	unsigned long chunk_kb;
 	struct bitmap_counts *counts;
 
 	if (!bitmap)
-		return;
+		return -ENOENT;
 
 	counts = &bitmap->counts;
+	stats->missing_pages = counts->missing_pages;
+	stats->pages = counts->pages;
+	stats->file = bitmap->storage.file;
 
-	chunk_kb = bitmap->mddev->bitmap_info.chunksize >> 10;
-	seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], "
-		   "%lu%s chunk",
-		   counts->pages - counts->missing_pages,
-		   counts->pages,
-		   (counts->pages - counts->missing_pages)
-		   << (PAGE_SHIFT - 10),
-		   chunk_kb ? chunk_kb : bitmap->mddev->bitmap_info.chunksize,
-		   chunk_kb ? "KB" : "B");
-	if (bitmap->storage.file) {
-		seq_printf(seq, ", file: ");
-		seq_file_path(seq, bitmap->storage.file, " \t\n");
-	}
-
-	seq_printf(seq, "\n");
+	return 0;
 }
 
 int md_bitmap_resize(struct bitmap *bitmap, sector_t blocks,
diff --git a/drivers/md/md-bitmap.h b/drivers/md/md-bitmap.h
index bb9eb418780a..b60418e3f573 100644
--- a/drivers/md/md-bitmap.h
+++ b/drivers/md/md-bitmap.h
@@ -234,6 +234,12 @@ struct bitmap {
 	int cluster_slot;		/* Slot offset for clustered env */
 };
 
+struct md_bitmap_stats {
+	unsigned long	missing_pages;
+	unsigned long	pages;
+	struct file	*file;
+};
+
 /* the bitmap API */
 
 /* these are used only by md/bitmap */
@@ -244,7 +250,7 @@ void md_bitmap_destroy(struct mddev *mddev);
 
 void md_bitmap_print_sb(struct bitmap *bitmap);
 void md_bitmap_update_sb(struct bitmap *bitmap);
-void md_bitmap_status(struct seq_file *seq, struct bitmap *bitmap);
+int md_bitmap_get_stats(struct bitmap *bitmap, struct md_bitmap_stats *stats);
 
 int  md_bitmap_setallbits(struct bitmap *bitmap);
 void md_bitmap_write_all(struct bitmap *bitmap);
diff --git a/drivers/md/md.c b/drivers/md/md.c
index d3a837506a36..b52d0cc773ae 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -8370,6 +8370,33 @@ static void md_seq_stop(struct seq_file *seq, void *v)
 	spin_unlock(&all_mddevs_lock);
 }
 
+static void md_bitmap_status(struct seq_file *seq, struct mddev *mddev)
+{
+	struct md_bitmap_stats stats;
+	unsigned long used_pages;
+	unsigned long chunk_kb;
+	int err;
+
+	err = md_bitmap_get_stats(mddev->bitmap, &stats);
+	if (err)
+		return;
+
+	chunk_kb = mddev->bitmap_info.chunksize >> 10;
+	used_pages = stats.pages - stats.missing_pages;
+
+	seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], %lu%s chunk",
+		   used_pages, stats.pages, used_pages << (PAGE_SHIFT - 10),
+		   chunk_kb ? chunk_kb : mddev->bitmap_info.chunksize,
+		   chunk_kb ? "KB" : "B");
+
+	if (stats.file) {
+		seq_puts(seq, ", file: ");
+		seq_file_path(seq, stats.file, " \t\n");
+	}
+
+	seq_putc(seq, '\n');
+}
+
 static int md_seq_show(struct seq_file *seq, void *v)
 {
 	struct mddev *mddev;
@@ -8453,7 +8480,7 @@ static int md_seq_show(struct seq_file *seq, void *v)
 		} else
 			seq_printf(seq, "\n       ");
 
-		md_bitmap_status(seq, mddev->bitmap);
+		md_bitmap_status(seq, mddev);
 
 		seq_printf(seq, "\n");
 	}
-- 
2.39.2

[PATCH md-6.12 03/41] md: use new helper md_bitmap_get_stats() in update_array_info()

[Yu Kuai]

From: Yu Kuai <yukuai3@huawei.com>

There are no functional changes, avoid dereferencing bitmap directly to
prepare inventing a new bitmap.

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
---
 drivers/md/md.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/drivers/md/md.c b/drivers/md/md.c
index b52d0cc773ae..92e7f05e6bc1 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -7577,15 +7577,17 @@ static int update_array_info(struct mddev *mddev, mdu_array_info_t *info)
 			if (rv)
 				md_bitmap_destroy(mddev);
 		} else {
-			/* remove the bitmap */
-			if (!mddev->bitmap) {
-				rv = -ENOENT;
+			struct md_bitmap_stats stats;
+
+			rv = md_bitmap_get_stats(mddev->bitmap, &stats);
+			if (rv)
 				goto err;
-			}
-			if (mddev->bitmap->storage.file) {
+
+			if (stats.file) {
 				rv = -EINVAL;
 				goto err;
 			}
+
 			if (mddev->bitmap_info.nodes) {
 				/* hold PW on all the bitmap lock */
 				if (md_cluster_ops->lock_all_bitmaps(mddev) <= 0) {
-- 
2.39.2

[PATCH md-6.12 04/41] md/md-bitmap: add 'events_cleared' into struct md_bitmap_stats

[Yu Kuai]

From: Yu Kuai <yukuai3@huawei.com>

Also add a new helper to get events_cleared to avoid dereferencing
bitmap directly to prepare inventing a new bitmap.

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
---
 drivers/md/md-bitmap.c |  2 ++
 drivers/md/md-bitmap.h |  1 +
 drivers/md/md.c        | 16 ++++++++++++++--
 3 files changed, 17 insertions(+), 2 deletions(-)

diff --git a/drivers/md/md-bitmap.c b/drivers/md/md-bitmap.c
index 66ebe12d80ae..95afc22bd255 100644
--- a/drivers/md/md-bitmap.c
+++ b/drivers/md/md-bitmap.c
@@ -2104,6 +2104,8 @@ int md_bitmap_get_stats(struct bitmap *bitmap, struct md_bitmap_stats *stats)
 	counts = &bitmap->counts;
 	stats->missing_pages = counts->missing_pages;
 	stats->pages = counts->pages;
+
+	stats->events_cleared = bitmap->events_cleared;
 	stats->file = bitmap->storage.file;
 
 	return 0;
diff --git a/drivers/md/md-bitmap.h b/drivers/md/md-bitmap.h
index b60418e3f573..751dca2366c3 100644
--- a/drivers/md/md-bitmap.h
+++ b/drivers/md/md-bitmap.h
@@ -235,6 +235,7 @@ struct bitmap {
 };
 
 struct md_bitmap_stats {
+	u64		events_cleared;
 	unsigned long	missing_pages;
 	unsigned long	pages;
 	struct file	*file;
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 92e7f05e6bc1..5e1dd3009092 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -1372,6 +1372,18 @@ static int super_90_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor
 	return ret;
 }
 
+static u64 md_bitmap_events_cleared(struct mddev *mddev)
+{
+	struct md_bitmap_stats stats;
+	int err;
+
+	err = md_bitmap_get_stats(mddev->bitmap, &stats);
+	if (err)
+		return 0;
+
+	return stats.events_cleared;
+}
+
 /*
  * validate_super for 0.90.0
  * note: we are not using "freshest" for 0.9 superblock
@@ -1464,7 +1476,7 @@ static int super_90_validate(struct mddev *mddev, struct md_rdev *freshest, stru
 		/* if adding to array with a bitmap, then we can accept an
 		 * older device ... but not too old.
 		 */
-		if (ev1 < mddev->bitmap->events_cleared)
+		if (ev1 < md_bitmap_events_cleared(mddev))
 			return 0;
 		if (ev1 < mddev->events)
 			set_bit(Bitmap_sync, &rdev->flags);
@@ -1991,7 +2003,7 @@ static int super_1_validate(struct mddev *mddev, struct md_rdev *freshest, struc
 		/* If adding to array with a bitmap, then we can accept an
 		 * older device, but not too old.
 		 */
-		if (ev1 < mddev->bitmap->events_cleared)
+		if (ev1 < md_bitmap_events_cleared(mddev))
 			return 0;
 		if (ev1 < mddev->events)
 			set_bit(Bitmap_sync, &rdev->flags);
-- 
2.39.2

[PATCH md-6.12 05/41] md/md-bitmap: add 'sync_size' into struct md_bitmap_stats

[Yu Kuai]

From: Yu Kuai <yukuai3@huawei.com>

To avoid dereferencing bitmap directly in md-cluster to prepare
inventing a new bitmap.

BTW, also fix following checkpatch warnings:

WARNING: Deprecated use of 'kmap_atomic', prefer 'kmap_local_page' instead
WARNING: Deprecated use of 'kunmap_atomic', prefer 'kunmap_local' instead

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
---
 drivers/md/md-bitmap.c  |  6 ++++++
 drivers/md/md-bitmap.h  |  1 +
 drivers/md/md-cluster.c | 34 ++++++++++++++++++++--------------
 3 files changed, 27 insertions(+), 14 deletions(-)

diff --git a/drivers/md/md-bitmap.c b/drivers/md/md-bitmap.c
index 95afc22bd255..105778cc34ed 100644
--- a/drivers/md/md-bitmap.c
+++ b/drivers/md/md-bitmap.c
@@ -2097,10 +2097,15 @@ EXPORT_SYMBOL_GPL(md_bitmap_copy_from_slot);
 int md_bitmap_get_stats(struct bitmap *bitmap, struct md_bitmap_stats *stats)
 {
 	struct bitmap_counts *counts;
+	bitmap_super_t *sb;
 
 	if (!bitmap)
 		return -ENOENT;
 
+	sb = kmap_local_page(bitmap->storage.sb_page);
+	stats->sync_size = sb->sync_size;
+	kunmap_local(sb);
+
 	counts = &bitmap->counts;
 	stats->missing_pages = counts->missing_pages;
 	stats->pages = counts->pages;
@@ -2110,6 +2115,7 @@ int md_bitmap_get_stats(struct bitmap *bitmap, struct md_bitmap_stats *stats)
 
 	return 0;
 }
+EXPORT_SYMBOL_GPL(md_bitmap_get_stats);
 
 int md_bitmap_resize(struct bitmap *bitmap, sector_t blocks,
 		  int chunksize, int init)
diff --git a/drivers/md/md-bitmap.h b/drivers/md/md-bitmap.h
index 751dca2366c3..a43a75575769 100644
--- a/drivers/md/md-bitmap.h
+++ b/drivers/md/md-bitmap.h
@@ -237,6 +237,7 @@ struct bitmap {
 struct md_bitmap_stats {
 	u64		events_cleared;
 	unsigned long	missing_pages;
+	unsigned long	sync_size;
 	unsigned long	pages;
 	struct file	*file;
 };
diff --git a/drivers/md/md-cluster.c b/drivers/md/md-cluster.c
index 1d0db62f0351..e3faf752f0b1 100644
--- a/drivers/md/md-cluster.c
+++ b/drivers/md/md-cluster.c
@@ -1207,18 +1207,21 @@ static int resize_bitmaps(struct mddev *mddev, sector_t newsize, sector_t oldsiz
  */
 static int cluster_check_sync_size(struct mddev *mddev)
 {
-	int i, rv;
-	bitmap_super_t *sb;
-	unsigned long my_sync_size, sync_size = 0;
-	int node_num = mddev->bitmap_info.nodes;
 	int current_slot = md_cluster_ops->slot_number(mddev);
+	int node_num = mddev->bitmap_info.nodes;
 	struct bitmap *bitmap = mddev->bitmap;
-	char str[64];
 	struct dlm_lock_resource *bm_lockres;
+	struct md_bitmap_stats stats;
+	unsigned long sync_size = 0;
+	unsigned long my_sync_size;
+	char str[64];
+	int i, rv;
 
-	sb = kmap_atomic(bitmap->storage.sb_page);
-	my_sync_size = sb->sync_size;
-	kunmap_atomic(sb);
+	rv = md_bitmap_get_stats(bitmap, &stats);
+	if (rv)
+		return rv;
+
+	my_sync_size = stats.sync_size;
 
 	for (i = 0; i < node_num; i++) {
 		if (i == current_slot)
@@ -1247,15 +1250,18 @@ static int cluster_check_sync_size(struct mddev *mddev)
 			md_bitmap_update_sb(bitmap);
 		lockres_free(bm_lockres);
 
-		sb = kmap_atomic(bitmap->storage.sb_page);
-		if (sync_size == 0)
-			sync_size = sb->sync_size;
-		else if (sync_size != sb->sync_size) {
-			kunmap_atomic(sb);
+		rv = md_bitmap_get_stats(bitmap, &stats);
+		if (rv) {
+			md_bitmap_free(bitmap);
+			return rv;
+		}
+
+		if (sync_size == 0) {
+			sync_size = stats.sync_size;
+		} else if (sync_size != stats.sync_size) {
 			md_bitmap_free(bitmap);
 			return -1;
 		}
-		kunmap_atomic(sb);
 		md_bitmap_free(bitmap);
 	}
 
-- 
2.39.2

[PATCH md-6.12 06/41] md/md-bitmap: add 'file_pages' into struct md_bitmap_stats

[Yu Kuai]

From: Yu Kuai <yukuai3@huawei.com>

There are no functional changes, avoid dereferencing bitmap directly to
prepare inventing a new bitmap.

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
---
 drivers/md/md-bitmap.c |  7 +++++--
 drivers/md/md-bitmap.h |  1 +
 drivers/md/md.c        | 17 +++++++++++------
 3 files changed, 17 insertions(+), 8 deletions(-)

diff --git a/drivers/md/md-bitmap.c b/drivers/md/md-bitmap.c
index 105778cc34ed..82b31a46caa1 100644
--- a/drivers/md/md-bitmap.c
+++ b/drivers/md/md-bitmap.c
@@ -2096,6 +2096,7 @@ EXPORT_SYMBOL_GPL(md_bitmap_copy_from_slot);
 
 int md_bitmap_get_stats(struct bitmap *bitmap, struct md_bitmap_stats *stats)
 {
+	struct bitmap_storage *storage;
 	struct bitmap_counts *counts;
 	bitmap_super_t *sb;
 
@@ -2110,9 +2111,11 @@ int md_bitmap_get_stats(struct bitmap *bitmap, struct md_bitmap_stats *stats)
 	stats->missing_pages = counts->missing_pages;
 	stats->pages = counts->pages;
 
-	stats->events_cleared = bitmap->events_cleared;
-	stats->file = bitmap->storage.file;
+	storage = &bitmap->storage;
+	stats->file_pages = storage->file_pages;
+	stats->file = storage->file;
 
+	stats->events_cleared = bitmap->events_cleared;
 	return 0;
 }
 EXPORT_SYMBOL_GPL(md_bitmap_get_stats);
diff --git a/drivers/md/md-bitmap.h b/drivers/md/md-bitmap.h
index a43a75575769..870125670087 100644
--- a/drivers/md/md-bitmap.h
+++ b/drivers/md/md-bitmap.h
@@ -237,6 +237,7 @@ struct bitmap {
 struct md_bitmap_stats {
 	u64		events_cleared;
 	unsigned long	missing_pages;
+	unsigned long	file_pages;
 	unsigned long	sync_size;
 	unsigned long	pages;
 	struct file	*file;
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 5e1dd3009092..53e10dc28f72 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -2335,7 +2335,6 @@ super_1_allow_new_offset(struct md_rdev *rdev,
 			 unsigned long long new_offset)
 {
 	/* All necessary checks on new >= old have been done */
-	struct bitmap *bitmap;
 	if (new_offset >= rdev->data_offset)
 		return 1;
 
@@ -2352,11 +2351,17 @@ super_1_allow_new_offset(struct md_rdev *rdev,
 	 */
 	if (rdev->sb_start + (32+4)*2 > new_offset)
 		return 0;
-	bitmap = rdev->mddev->bitmap;
-	if (bitmap && !rdev->mddev->bitmap_info.file &&
-	    rdev->sb_start + rdev->mddev->bitmap_info.offset +
-	    bitmap->storage.file_pages * (PAGE_SIZE>>9) > new_offset)
-		return 0;
+
+	if (!rdev->mddev->bitmap_info.file) {
+		struct md_bitmap_stats stats;
+		int err;
+
+		err = md_bitmap_get_stats(rdev->mddev->bitmap, &stats);
+		if (!err && rdev->sb_start + rdev->mddev->bitmap_info.offset +
+		    stats.file_pages * (PAGE_SIZE >> 9) > new_offset)
+			return 0;
+	}
+
 	if (rdev->badblocks.sector + rdev->badblocks.size > new_offset)
 		return 0;
 
-- 
2.39.2

[PATCH md-6.12 07/41] md/md-bitmap: add 'behind_writes' and 'behind_wait' into struct md_bitmap_stats

[Yu Kuai]

From: Yu Kuai <yukuai3@huawei.com>

There are no functional changes, avoid dereferencing bitmap directly to
prepare inventing a new bitmap.

Also fix following checkpatch warning by using wq_has_sleeper().

WARNING: waitqueue_active without comment

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
---
 drivers/md/md-bitmap.c |  2 ++
 drivers/md/md-bitmap.h |  3 +++
 drivers/md/raid1.c     | 13 ++++++++-----
 3 files changed, 13 insertions(+), 5 deletions(-)

diff --git a/drivers/md/md-bitmap.c b/drivers/md/md-bitmap.c
index 82b31a46caa1..ab349182e646 100644
--- a/drivers/md/md-bitmap.c
+++ b/drivers/md/md-bitmap.c
@@ -2115,6 +2115,8 @@ int md_bitmap_get_stats(struct bitmap *bitmap, struct md_bitmap_stats *stats)
 	stats->file_pages = storage->file_pages;
 	stats->file = storage->file;
 
+	stats->behind_writes = atomic_read(&bitmap->behind_writes);
+	stats->behind_wait = wq_has_sleeper(&bitmap->behind_wait);
 	stats->events_cleared = bitmap->events_cleared;
 	return 0;
 }
diff --git a/drivers/md/md-bitmap.h b/drivers/md/md-bitmap.h
index 870125670087..909a661383c6 100644
--- a/drivers/md/md-bitmap.h
+++ b/drivers/md/md-bitmap.h
@@ -236,6 +236,9 @@ struct bitmap {
 
 struct md_bitmap_stats {
 	u64		events_cleared;
+	int		behind_writes;
+	bool		behind_wait;
+
 	unsigned long	missing_pages;
 	unsigned long	file_pages;
 	unsigned long	sync_size;
diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index 81fc100e7830..f9861f9103c2 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -1603,16 +1603,19 @@ static void raid1_write_request(struct mddev *mddev, struct bio *bio,
 			continue;
 
 		if (first_clone) {
+			unsigned long max_write_behind =
+				mddev->bitmap_info.max_write_behind;
+			struct md_bitmap_stats stats;
+			int err;
+
 			/* do behind I/O ?
 			 * Not if there are too many, or cannot
 			 * allocate memory, or a reader on WriteMostly
 			 * is waiting for behind writes to flush */
-			if (bitmap && write_behind &&
-			    (atomic_read(&bitmap->behind_writes)
-			     < mddev->bitmap_info.max_write_behind) &&
-			    !waitqueue_active(&bitmap->behind_wait)) {
+			err = md_bitmap_get_stats(bitmap, &stats);
+			if (!err && write_behind && !stats.behind_wait &&
+			    stats.behind_writes < max_write_behind)
 				alloc_behind_master_bio(r1_bio, bio);
-			}
 
 			md_bitmap_startwrite(bitmap, r1_bio->sector, r1_bio->sectors,
 					     test_bit(R1BIO_BehindIO, &r1_bio->state));
-- 
2.39.2

[PATCH md-6.12 08/41] md/md-cluster: use helper md_bitmap_get_stats() to get pages in resize_bitmaps()

[Yu Kuai]

From: Yu Kuai <yukuai3@huawei.com>

Use the existed helper instead of open coding it, avoid dereferencing
bitmap directly to prepare inventing a new bitmap.

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
---
 drivers/md/md-cluster.c | 20 +++++++++++++++-----
 1 file changed, 15 insertions(+), 5 deletions(-)

diff --git a/drivers/md/md-cluster.c b/drivers/md/md-cluster.c
index e3faf752f0b1..76febdc5d7f6 100644
--- a/drivers/md/md-cluster.c
+++ b/drivers/md/md-cluster.c
@@ -1143,13 +1143,16 @@ static int update_bitmap_size(struct mddev *mddev, sector_t size)
 
 static int resize_bitmaps(struct mddev *mddev, sector_t newsize, sector_t oldsize)
 {
-	struct bitmap_counts *counts;
-	char str[64];
-	struct dlm_lock_resource *bm_lockres;
 	struct bitmap *bitmap = mddev->bitmap;
-	unsigned long my_pages = bitmap->counts.pages;
+	struct md_bitmap_stats stats;
+	unsigned long my_pages;
 	int i, rv;
 
+	rv = md_bitmap_get_stats(bitmap, &stats);
+	if (rv)
+		return rv;
+
+	my_pages = stats.pages;
 	/*
 	 * We need to ensure all the nodes can grow to a larger
 	 * bitmap size before make the reshaping.
@@ -1159,6 +1162,10 @@ static int resize_bitmaps(struct mddev *mddev, sector_t newsize, sector_t oldsiz
 		return rv;
 
 	for (i = 0; i < mddev->bitmap_info.nodes; i++) {
+		struct dlm_lock_resource *bm_lockres;
+		struct bitmap_counts *counts;
+		char str[64];
+
 		if (i == md_cluster_ops->slot_number(mddev))
 			continue;
 
@@ -1170,6 +1177,9 @@ static int resize_bitmaps(struct mddev *mddev, sector_t newsize, sector_t oldsiz
 		}
 		counts = &bitmap->counts;
 
+		rv = md_bitmap_get_stats(bitmap, &stats);
+		if (rv)
+			goto out;
 		/*
 		 * If we can hold the bitmap lock of one node then
 		 * the slot is not occupied, update the pages.
@@ -1186,7 +1196,7 @@ static int resize_bitmaps(struct mddev *mddev, sector_t newsize, sector_t oldsiz
 			counts->pages = my_pages;
 		lockres_free(bm_lockres);
 
-		if (my_pages != counts->pages)
+		if (my_pages != stats.pages)
 			/*
 			 * Let's revert the bitmap size if one node
 			 * can't resize bitmap
-- 
2.39.2

[PATCH md-6.12 09/41] md/md-bitmap: add a new helper md_bitmap_set_pages()

[Yu Kuai]

From: Yu Kuai <yukuai3@huawei.com>

Currently md-cluster will set bitmap->counts.pages directly, add a
helper to do this to avoid dereferencing bitmap directly.

Noted that after this patch bitmap is not dereferenced directly anymore
and following patches will move the structure inside md-bitmap.c.

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
---
 drivers/md/md-bitmap.c  | 6 ++++++
 drivers/md/md-bitmap.h  | 1 +
 drivers/md/md-cluster.c | 4 +---
 3 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/md/md-bitmap.c b/drivers/md/md-bitmap.c
index ab349182e646..61132c82add7 100644
--- a/drivers/md/md-bitmap.c
+++ b/drivers/md/md-bitmap.c
@@ -2094,6 +2094,12 @@ int md_bitmap_copy_from_slot(struct mddev *mddev, int slot,
 }
 EXPORT_SYMBOL_GPL(md_bitmap_copy_from_slot);
 
+void md_bitmap_set_pages(struct bitmap *bitmap, unsigned long pages)
+{
+	bitmap->counts.pages = pages;
+}
+EXPORT_SYMBOL_GPL(md_bitmap_set_pages);
+
 int md_bitmap_get_stats(struct bitmap *bitmap, struct md_bitmap_stats *stats)
 {
 	struct bitmap_storage *storage;
diff --git a/drivers/md/md-bitmap.h b/drivers/md/md-bitmap.h
index 909a661383c6..c4d64311c0e8 100644
--- a/drivers/md/md-bitmap.h
+++ b/drivers/md/md-bitmap.h
@@ -285,6 +285,7 @@ int md_bitmap_resize(struct bitmap *bitmap, sector_t blocks,
 struct bitmap *get_bitmap_from_slot(struct mddev *mddev, int slot);
 int md_bitmap_copy_from_slot(struct mddev *mddev, int slot,
 			     sector_t *lo, sector_t *hi, bool clear_bits);
+void md_bitmap_set_pages(struct bitmap *bitmap, unsigned long pages);
 void md_bitmap_free(struct bitmap *bitmap);
 void md_bitmap_wait_behind_writes(struct mddev *mddev);
 
diff --git a/drivers/md/md-cluster.c b/drivers/md/md-cluster.c
index 76febdc5d7f6..59f7fbca783b 100644
--- a/drivers/md/md-cluster.c
+++ b/drivers/md/md-cluster.c
@@ -1163,7 +1163,6 @@ static int resize_bitmaps(struct mddev *mddev, sector_t newsize, sector_t oldsiz
 
 	for (i = 0; i < mddev->bitmap_info.nodes; i++) {
 		struct dlm_lock_resource *bm_lockres;
-		struct bitmap_counts *counts;
 		char str[64];
 
 		if (i == md_cluster_ops->slot_number(mddev))
@@ -1175,7 +1174,6 @@ static int resize_bitmaps(struct mddev *mddev, sector_t newsize, sector_t oldsiz
 			bitmap = NULL;
 			goto out;
 		}
-		counts = &bitmap->counts;
 
 		rv = md_bitmap_get_stats(bitmap, &stats);
 		if (rv)
@@ -1193,7 +1191,7 @@ static int resize_bitmaps(struct mddev *mddev, sector_t newsize, sector_t oldsiz
 		bm_lockres->flags |= DLM_LKF_NOQUEUE;
 		rv = dlm_lock_sync(bm_lockres, DLM_LOCK_PW);
 		if (!rv)
-			counts->pages = my_pages;
+			md_bitmap_set_pages(bitmap, my_pages);
 		lockres_free(bm_lockres);
 
 		if (my_pages != stats.pages)
-- 
2.39.2

[PATCH md-6.12 10/41] md/md-bitmap: introduce struct bitmap_operations

[Yu Kuai]

From: Yu Kuai <yukuai3@huawei.com>

The structure is empty for now, and will be used in later patches to
merge in bitmap operations, so that bitmap implementation won't be
exposed.

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
---
 drivers/md/md-bitmap.c | 8 ++++++++
 drivers/md/md-bitmap.h | 4 ++++
 drivers/md/md.c        | 1 +
 drivers/md/md.h        | 1 +
 4 files changed, 14 insertions(+)

diff --git a/drivers/md/md-bitmap.c b/drivers/md/md-bitmap.c
index 61132c82add7..2d044e2d2df6 100644
--- a/drivers/md/md-bitmap.c
+++ b/drivers/md/md-bitmap.c
@@ -2714,3 +2714,11 @@ const struct attribute_group md_bitmap_group = {
 	.name = "bitmap",
 	.attrs = md_bitmap_attrs,
 };
+
+static struct bitmap_operations bitmap_ops = {
+};
+
+void mddev_set_bitmap_ops(struct mddev *mddev)
+{
+	mddev->bitmap_ops = &bitmap_ops;
+}
diff --git a/drivers/md/md-bitmap.h b/drivers/md/md-bitmap.h
index c4d64311c0e8..14c21ab42f9e 100644
--- a/drivers/md/md-bitmap.h
+++ b/drivers/md/md-bitmap.h
@@ -246,7 +246,11 @@ struct md_bitmap_stats {
 	struct file	*file;
 };
 
+struct bitmap_operations {
+};
+
 /* the bitmap API */
+void mddev_set_bitmap_ops(struct mddev *mddev);
 
 /* these are used only by md/bitmap */
 struct bitmap *md_bitmap_create(struct mddev *mddev, int slot);
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 53e10dc28f72..de2bc11783c2 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -772,6 +772,7 @@ int mddev_init(struct mddev *mddev)
 	mddev->resync_min = 0;
 	mddev->resync_max = MaxSector;
 	mddev->level = LEVEL_NONE;
+	mddev_set_bitmap_ops(mddev);
 
 	INIT_WORK(&mddev->sync_work, md_start_sync);
 	INIT_WORK(&mddev->del_work, mddev_delayed_delete);
diff --git a/drivers/md/md.h b/drivers/md/md.h
index a0d6827dced9..e56193f71ab4 100644
--- a/drivers/md/md.h
+++ b/drivers/md/md.h
@@ -536,6 +536,7 @@ struct mddev {
 	int				sync_checkers;	/* # of threads checking writes_pending */
 
 	struct bitmap			*bitmap; /* the bitmap for the device */
+	struct bitmap_operations	*bitmap_ops;
 	struct {
 		struct file		*file; /* the bitmap file */
 		loff_t			offset; /* offset from superblock of
-- 
2.39.2

[PATCH md-6.12 11/41] md/md-bitmap: simplify md_bitmap_create() + md_bitmap_load()

[Yu Kuai]

From: Yu Kuai <yukuai3@huawei.com>

Other than internal api get_bitmap_from_slot(), all other places will
set returned bitmap to mddev->bitmap. So move the setting of
mddev->bitmap into md_bitmap_create() to simplify code.

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
---
 drivers/md/md-bitmap.c | 23 +++++++++++++++--------
 drivers/md/md-bitmap.h |  2 +-
 drivers/md/md.c        | 30 +++++++++---------------------
 3 files changed, 25 insertions(+), 30 deletions(-)

diff --git a/drivers/md/md-bitmap.c b/drivers/md/md-bitmap.c
index 2d044e2d2df6..1241a10b7308 100644
--- a/drivers/md/md-bitmap.c
+++ b/drivers/md/md-bitmap.c
@@ -1879,7 +1879,7 @@ void md_bitmap_destroy(struct mddev *mddev)
  * if this returns an error, bitmap_destroy must be called to do clean up
  * once mddev->bitmap is set
  */
-struct bitmap *md_bitmap_create(struct mddev *mddev, int slot)
+static struct bitmap *__bitmap_create(struct mddev *mddev, int slot)
 {
 	struct bitmap *bitmap;
 	sector_t blocks = mddev->resync_max_sectors;
@@ -1966,6 +1966,17 @@ struct bitmap *md_bitmap_create(struct mddev *mddev, int slot)
 	return ERR_PTR(err);
 }
 
+int md_bitmap_create(struct mddev *mddev, int slot)
+{
+	struct bitmap *bitmap = __bitmap_create(mddev, slot);
+
+	if (IS_ERR(bitmap))
+		return PTR_ERR(bitmap);
+
+	mddev->bitmap = bitmap;
+	return 0;
+}
+
 int md_bitmap_load(struct mddev *mddev)
 {
 	int err = 0;
@@ -2030,7 +2041,7 @@ struct bitmap *get_bitmap_from_slot(struct mddev *mddev, int slot)
 	int rv = 0;
 	struct bitmap *bitmap;
 
-	bitmap = md_bitmap_create(mddev, slot);
+	bitmap = __bitmap_create(mddev, slot);
 	if (IS_ERR(bitmap)) {
 		rv = PTR_ERR(bitmap);
 		return ERR_PTR(rv);
@@ -2384,7 +2395,6 @@ location_store(struct mddev *mddev, const char *buf, size_t len)
 	} else {
 		/* No bitmap, OK to set a location */
 		long long offset;
-		struct bitmap *bitmap;
 
 		if (strncmp(buf, "none", 4) == 0)
 			/* nothing to be done */;
@@ -2411,13 +2421,10 @@ location_store(struct mddev *mddev, const char *buf, size_t len)
 			}
 
 			mddev->bitmap_info.offset = offset;
-			bitmap = md_bitmap_create(mddev, -1);
-			if (IS_ERR(bitmap)) {
-				rv = PTR_ERR(bitmap);
+			rv = md_bitmap_create(mddev, -1);
+			if (rv)
 				goto out;
-			}
 
-			mddev->bitmap = bitmap;
 			rv = md_bitmap_load(mddev);
 			if (rv) {
 				mddev->bitmap_info.offset = 0;
diff --git a/drivers/md/md-bitmap.h b/drivers/md/md-bitmap.h
index 14c21ab42f9e..d66f447f4be6 100644
--- a/drivers/md/md-bitmap.h
+++ b/drivers/md/md-bitmap.h
@@ -253,7 +253,7 @@ struct bitmap_operations {
 void mddev_set_bitmap_ops(struct mddev *mddev);
 
 /* these are used only by md/bitmap */
-struct bitmap *md_bitmap_create(struct mddev *mddev, int slot);
+int md_bitmap_create(struct mddev *mddev, int slot);
 int md_bitmap_load(struct mddev *mddev);
 void md_bitmap_flush(struct mddev *mddev);
 void md_bitmap_destroy(struct mddev *mddev);
diff --git a/drivers/md/md.c b/drivers/md/md.c
index de2bc11783c2..105faffaac54 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -6224,16 +6224,10 @@ int md_run(struct mddev *mddev)
 	}
 	if (err == 0 && pers->sync_request &&
 	    (mddev->bitmap_info.file || mddev->bitmap_info.offset)) {
-		struct bitmap *bitmap;
-
-		bitmap = md_bitmap_create(mddev, -1);
-		if (IS_ERR(bitmap)) {
-			err = PTR_ERR(bitmap);
+		err = md_bitmap_create(mddev, -1);
+		if (err)
 			pr_warn("%s: failed to create bitmap (%d)\n",
 				mdname(mddev), err);
-		} else
-			mddev->bitmap = bitmap;
-
 	}
 	if (err)
 		goto bitmap_abort;
@@ -7288,14 +7282,10 @@ static int set_bitmap_file(struct mddev *mddev, int fd)
 	err = 0;
 	if (mddev->pers) {
 		if (fd >= 0) {
-			struct bitmap *bitmap;
-
-			bitmap = md_bitmap_create(mddev, -1);
-			if (!IS_ERR(bitmap)) {
-				mddev->bitmap = bitmap;
+			err = md_bitmap_create(mddev, -1);
+			if (!err)
 				err = md_bitmap_load(mddev);
-			} else
-				err = PTR_ERR(bitmap);
+
 			if (err) {
 				md_bitmap_destroy(mddev);
 				fd = -1;
@@ -7304,6 +7294,7 @@ static int set_bitmap_file(struct mddev *mddev, int fd)
 			md_bitmap_destroy(mddev);
 		}
 	}
+
 	if (fd < 0) {
 		struct file *f = mddev->bitmap_info.file;
 		if (f) {
@@ -7572,7 +7563,6 @@ static int update_array_info(struct mddev *mddev, mdu_array_info_t *info)
 			goto err;
 		}
 		if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
-			struct bitmap *bitmap;
 			/* add the bitmap */
 			if (mddev->bitmap) {
 				rv = -EEXIST;
@@ -7586,12 +7576,10 @@ static int update_array_info(struct mddev *mddev, mdu_array_info_t *info)
 				mddev->bitmap_info.default_offset;
 			mddev->bitmap_info.space =
 				mddev->bitmap_info.default_space;
-			bitmap = md_bitmap_create(mddev, -1);
-			if (!IS_ERR(bitmap)) {
-				mddev->bitmap = bitmap;
+			rv = md_bitmap_create(mddev, -1);
+			if (!rv)
 				rv = md_bitmap_load(mddev);
-			} else
-				rv = PTR_ERR(bitmap);
+
 			if (rv)
 				md_bitmap_destroy(mddev);
 		} else {
-- 
2.39.2

[PATCH md-6.12 12/41] md/md-bitmap: merge md_bitmap_create() into bitmap_operations

[Yu Kuai]

From: Yu Kuai <yukuai3@huawei.com>

So that the implementation won't be exposed, and it'll be possible
to invent a new bitmap by replacing bitmap_operations.

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
---
 drivers/md/md-bitmap.c | 5 +++--
 drivers/md/md-bitmap.h | 2 +-
 drivers/md/md.c        | 6 +++---
 3 files changed, 7 insertions(+), 6 deletions(-)

diff --git a/drivers/md/md-bitmap.c b/drivers/md/md-bitmap.c
index 1241a10b7308..c0089e787215 100644
--- a/drivers/md/md-bitmap.c
+++ b/drivers/md/md-bitmap.c
@@ -1966,7 +1966,7 @@ static struct bitmap *__bitmap_create(struct mddev *mddev, int slot)
 	return ERR_PTR(err);
 }
 
-int md_bitmap_create(struct mddev *mddev, int slot)
+static int bitmap_create(struct mddev *mddev, int slot)
 {
 	struct bitmap *bitmap = __bitmap_create(mddev, slot);
 
@@ -2421,7 +2421,7 @@ location_store(struct mddev *mddev, const char *buf, size_t len)
 			}
 
 			mddev->bitmap_info.offset = offset;
-			rv = md_bitmap_create(mddev, -1);
+			rv = bitmap_create(mddev, -1);
 			if (rv)
 				goto out;
 
@@ -2723,6 +2723,7 @@ const struct attribute_group md_bitmap_group = {
 };
 
 static struct bitmap_operations bitmap_ops = {
+	.create			= bitmap_create,
 };
 
 void mddev_set_bitmap_ops(struct mddev *mddev)
diff --git a/drivers/md/md-bitmap.h b/drivers/md/md-bitmap.h
index d66f447f4be6..f4c4925102b6 100644
--- a/drivers/md/md-bitmap.h
+++ b/drivers/md/md-bitmap.h
@@ -247,13 +247,13 @@ struct md_bitmap_stats {
 };
 
 struct bitmap_operations {
+	int (*create)(struct mddev *mddev, int slot);
 };
 
 /* the bitmap API */
 void mddev_set_bitmap_ops(struct mddev *mddev);
 
 /* these are used only by md/bitmap */
-int md_bitmap_create(struct mddev *mddev, int slot);
 int md_bitmap_load(struct mddev *mddev);
 void md_bitmap_flush(struct mddev *mddev);
 void md_bitmap_destroy(struct mddev *mddev);
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 105faffaac54..f766f5b8d2d3 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -6224,7 +6224,7 @@ int md_run(struct mddev *mddev)
 	}
 	if (err == 0 && pers->sync_request &&
 	    (mddev->bitmap_info.file || mddev->bitmap_info.offset)) {
-		err = md_bitmap_create(mddev, -1);
+		err = mddev->bitmap_ops->create(mddev, -1);
 		if (err)
 			pr_warn("%s: failed to create bitmap (%d)\n",
 				mdname(mddev), err);
@@ -7282,7 +7282,7 @@ static int set_bitmap_file(struct mddev *mddev, int fd)
 	err = 0;
 	if (mddev->pers) {
 		if (fd >= 0) {
-			err = md_bitmap_create(mddev, -1);
+			err = mddev->bitmap_ops->create(mddev, -1);
 			if (!err)
 				err = md_bitmap_load(mddev);
 
@@ -7576,7 +7576,7 @@ static int update_array_info(struct mddev *mddev, mdu_array_info_t *info)
 				mddev->bitmap_info.default_offset;
 			mddev->bitmap_info.space =
 				mddev->bitmap_info.default_space;
-			rv = md_bitmap_create(mddev, -1);
+			rv = mddev->bitmap_ops->create(mddev, -1);
 			if (!rv)
 				rv = md_bitmap_load(mddev);
 
-- 
2.39.2

[PATCH md-6.12 13/41] md/md-bitmap: merge md_bitmap_load() into bitmap_operations

[Yu Kuai]

From: Yu Kuai <yukuai3@huawei.com>

So that the implementation won't be exposed, and it'll be possible
to invent a new bitmap by replacing bitmap_operations.

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
---
 drivers/md/dm-raid.c   | 4 +++-
 drivers/md/md-bitmap.c | 6 +++---
 drivers/md/md-bitmap.h | 2 +-
 drivers/md/md.c        | 7 ++++---
 4 files changed, 11 insertions(+), 8 deletions(-)

diff --git a/drivers/md/dm-raid.c b/drivers/md/dm-raid.c
index 0c3323e0adb2..c3e201fde4c5 100644
--- a/drivers/md/dm-raid.c
+++ b/drivers/md/dm-raid.c
@@ -3949,7 +3949,9 @@ static int __load_dirty_region_bitmap(struct raid_set *rs)
 	/* Try loading the bitmap unless "raid0", which does not have one */
 	if (!rs_is_raid0(rs) &&
 	    !test_and_set_bit(RT_FLAG_RS_BITMAP_LOADED, &rs->runtime_flags)) {
-		r = md_bitmap_load(&rs->md);
+		struct mddev *mddev = &rs->md;
+
+		r = mddev->bitmap_ops->load(mddev);
 		if (r)
 			DMERR("Failed to load bitmap");
 	}
diff --git a/drivers/md/md-bitmap.c b/drivers/md/md-bitmap.c
index c0089e787215..bac247df6f40 100644
--- a/drivers/md/md-bitmap.c
+++ b/drivers/md/md-bitmap.c
@@ -1977,7 +1977,7 @@ static int bitmap_create(struct mddev *mddev, int slot)
 	return 0;
 }
 
-int md_bitmap_load(struct mddev *mddev)
+static int bitmap_load(struct mddev *mddev)
 {
 	int err = 0;
 	sector_t start = 0;
@@ -2033,7 +2033,6 @@ int md_bitmap_load(struct mddev *mddev)
 out:
 	return err;
 }
-EXPORT_SYMBOL_GPL(md_bitmap_load);
 
 /* caller need to free returned bitmap with md_bitmap_free() */
 struct bitmap *get_bitmap_from_slot(struct mddev *mddev, int slot)
@@ -2425,7 +2424,7 @@ location_store(struct mddev *mddev, const char *buf, size_t len)
 			if (rv)
 				goto out;
 
-			rv = md_bitmap_load(mddev);
+			rv = bitmap_load(mddev);
 			if (rv) {
 				mddev->bitmap_info.offset = 0;
 				md_bitmap_destroy(mddev);
@@ -2724,6 +2723,7 @@ const struct attribute_group md_bitmap_group = {
 
 static struct bitmap_operations bitmap_ops = {
 	.create			= bitmap_create,
+	.load			= bitmap_load,
 };
 
 void mddev_set_bitmap_ops(struct mddev *mddev)
diff --git a/drivers/md/md-bitmap.h b/drivers/md/md-bitmap.h
index f4c4925102b6..f5b04b61d9e9 100644
--- a/drivers/md/md-bitmap.h
+++ b/drivers/md/md-bitmap.h
@@ -248,13 +248,13 @@ struct md_bitmap_stats {
 
 struct bitmap_operations {
 	int (*create)(struct mddev *mddev, int slot);
+	int (*load)(struct mddev *mddev);
 };
 
 /* the bitmap API */
 void mddev_set_bitmap_ops(struct mddev *mddev);
 
 /* these are used only by md/bitmap */
-int md_bitmap_load(struct mddev *mddev);
 void md_bitmap_flush(struct mddev *mddev);
 void md_bitmap_destroy(struct mddev *mddev);
 
diff --git a/drivers/md/md.c b/drivers/md/md.c
index f766f5b8d2d3..ff59826aa192 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -6316,7 +6316,8 @@ int do_md_run(struct mddev *mddev)
 	err = md_run(mddev);
 	if (err)
 		goto out;
-	err = md_bitmap_load(mddev);
+
+	err = mddev->bitmap_ops->load(mddev);
 	if (err) {
 		md_bitmap_destroy(mddev);
 		goto out;
@@ -7284,7 +7285,7 @@ static int set_bitmap_file(struct mddev *mddev, int fd)
 		if (fd >= 0) {
 			err = mddev->bitmap_ops->create(mddev, -1);
 			if (!err)
-				err = md_bitmap_load(mddev);
+				err = mddev->bitmap_ops->load(mddev);
 
 			if (err) {
 				md_bitmap_destroy(mddev);
@@ -7578,7 +7579,7 @@ static int update_array_info(struct mddev *mddev, mdu_array_info_t *info)
 				mddev->bitmap_info.default_space;
 			rv = mddev->bitmap_ops->create(mddev, -1);
 			if (!rv)
-				rv = md_bitmap_load(mddev);
+				rv = mddev->bitmap_ops->load(mddev);
 
 			if (rv)
 				md_bitmap_destroy(mddev);
-- 
2.39.2

[PATCH md-6.12 14/41] md/md-bitmap: merge md_bitmap_destroy() into bitmap_operations

[Yu Kuai]

From: Yu Kuai <yukuai3@huawei.com>

So that the implementation won't be exposed, and it'll be possible
to invent a new bitmap by replacing bitmap_operations.

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
---
 drivers/md/md-bitmap.c |  7 ++++---
 drivers/md/md-bitmap.h |  2 +-
 drivers/md/md.c        | 15 ++++++++-------
 3 files changed, 13 insertions(+), 11 deletions(-)

diff --git a/drivers/md/md-bitmap.c b/drivers/md/md-bitmap.c
index bac247df6f40..0a276fe052c0 100644
--- a/drivers/md/md-bitmap.c
+++ b/drivers/md/md-bitmap.c
@@ -1853,7 +1853,7 @@ void md_bitmap_wait_behind_writes(struct mddev *mddev)
 }
 EXPORT_SYMBOL_GPL(md_bitmap_wait_behind_writes);
 
-void md_bitmap_destroy(struct mddev *mddev)
+static void bitmap_destroy(struct mddev *mddev)
 {
 	struct bitmap *bitmap = mddev->bitmap;
 
@@ -2384,7 +2384,7 @@ location_store(struct mddev *mddev, const char *buf, size_t len)
 			goto out;
 		}
 
-		md_bitmap_destroy(mddev);
+		bitmap_destroy(mddev);
 		mddev->bitmap_info.offset = 0;
 		if (mddev->bitmap_info.file) {
 			struct file *f = mddev->bitmap_info.file;
@@ -2427,7 +2427,7 @@ location_store(struct mddev *mddev, const char *buf, size_t len)
 			rv = bitmap_load(mddev);
 			if (rv) {
 				mddev->bitmap_info.offset = 0;
-				md_bitmap_destroy(mddev);
+				bitmap_destroy(mddev);
 				goto out;
 			}
 		}
@@ -2724,6 +2724,7 @@ const struct attribute_group md_bitmap_group = {
 static struct bitmap_operations bitmap_ops = {
 	.create			= bitmap_create,
 	.load			= bitmap_load,
+	.destroy		= bitmap_destroy,
 };
 
 void mddev_set_bitmap_ops(struct mddev *mddev)
diff --git a/drivers/md/md-bitmap.h b/drivers/md/md-bitmap.h
index f5b04b61d9e9..c8d27b91241b 100644
--- a/drivers/md/md-bitmap.h
+++ b/drivers/md/md-bitmap.h
@@ -249,6 +249,7 @@ struct md_bitmap_stats {
 struct bitmap_operations {
 	int (*create)(struct mddev *mddev, int slot);
 	int (*load)(struct mddev *mddev);
+	void (*destroy)(struct mddev *mddev);
 };
 
 /* the bitmap API */
@@ -256,7 +257,6 @@ void mddev_set_bitmap_ops(struct mddev *mddev);
 
 /* these are used only by md/bitmap */
 void md_bitmap_flush(struct mddev *mddev);
-void md_bitmap_destroy(struct mddev *mddev);
 
 void md_bitmap_print_sb(struct bitmap *bitmap);
 void md_bitmap_update_sb(struct bitmap *bitmap);
diff --git a/drivers/md/md.c b/drivers/md/md.c
index ff59826aa192..15e830641c0c 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -6297,7 +6297,7 @@ int md_run(struct mddev *mddev)
 		pers->free(mddev, mddev->private);
 	mddev->private = NULL;
 	module_put(pers->owner);
-	md_bitmap_destroy(mddev);
+	mddev->bitmap_ops->destroy(mddev);
 abort:
 	bioset_exit(&mddev->io_clone_set);
 exit_sync_set:
@@ -6319,7 +6319,7 @@ int do_md_run(struct mddev *mddev)
 
 	err = mddev->bitmap_ops->load(mddev);
 	if (err) {
-		md_bitmap_destroy(mddev);
+		mddev->bitmap_ops->destroy(mddev);
 		goto out;
 	}
 
@@ -6505,7 +6505,8 @@ static void mddev_detach(struct mddev *mddev)
 static void __md_stop(struct mddev *mddev)
 {
 	struct md_personality *pers = mddev->pers;
-	md_bitmap_destroy(mddev);
+
+	mddev->bitmap_ops->destroy(mddev);
 	mddev_detach(mddev);
 	spin_lock(&mddev->lock);
 	mddev->pers = NULL;
@@ -7288,11 +7289,11 @@ static int set_bitmap_file(struct mddev *mddev, int fd)
 				err = mddev->bitmap_ops->load(mddev);
 
 			if (err) {
-				md_bitmap_destroy(mddev);
+				mddev->bitmap_ops->destroy(mddev);
 				fd = -1;
 			}
 		} else if (fd < 0) {
-			md_bitmap_destroy(mddev);
+			mddev->bitmap_ops->destroy(mddev);
 		}
 	}
 
@@ -7582,7 +7583,7 @@ static int update_array_info(struct mddev *mddev, mdu_array_info_t *info)
 				rv = mddev->bitmap_ops->load(mddev);
 
 			if (rv)
-				md_bitmap_destroy(mddev);
+				mddev->bitmap_ops->destroy(mddev);
 		} else {
 			struct md_bitmap_stats stats;
 
@@ -7609,7 +7610,7 @@ static int update_array_info(struct mddev *mddev, mdu_array_info_t *info)
 				module_put(md_cluster_mod);
 				mddev->safemode_delay = DEFAULT_SAFEMODE_DELAY;
 			}
-			md_bitmap_destroy(mddev);
+			mddev->bitmap_ops->destroy(mddev);
 			mddev->bitmap_info.offset = 0;
 		}
 	}
-- 
2.39.2

[PATCH md-6.12 15/41] md/md-bitmap: merge md_bitmap_flush() into bitmap_operations

[Yu Kuai]

From: Yu Kuai <yukuai3@huawei.com>

So that the implementation won't be exposed, and it'll be possible
to invent a new bitmap by replacing bitmap_operations.

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
---
 drivers/md/md-bitmap.c | 6 ++----
 drivers/md/md-bitmap.h | 2 +-
 drivers/md/md.c        | 3 ++-
 3 files changed, 5 insertions(+), 6 deletions(-)

diff --git a/drivers/md/md-bitmap.c b/drivers/md/md-bitmap.c
index 0a276fe052c0..324b676ac927 100644
--- a/drivers/md/md-bitmap.c
+++ b/drivers/md/md-bitmap.c
@@ -1773,10 +1773,7 @@ void md_bitmap_dirty_bits(struct bitmap *bitmap, unsigned long s, unsigned long
 	}
 }
 
-/*
- * flush out any pending updates
- */
-void md_bitmap_flush(struct mddev *mddev)
+static void bitmap_flush(struct mddev *mddev)
 {
 	struct bitmap *bitmap = mddev->bitmap;
 	long sleep;
@@ -2725,6 +2722,7 @@ static struct bitmap_operations bitmap_ops = {
 	.create			= bitmap_create,
 	.load			= bitmap_load,
 	.destroy		= bitmap_destroy,
+	.flush			= bitmap_flush,
 };
 
 void mddev_set_bitmap_ops(struct mddev *mddev)
diff --git a/drivers/md/md-bitmap.h b/drivers/md/md-bitmap.h
index c8d27b91241b..c0858665554e 100644
--- a/drivers/md/md-bitmap.h
+++ b/drivers/md/md-bitmap.h
@@ -250,13 +250,13 @@ struct bitmap_operations {
 	int (*create)(struct mddev *mddev, int slot);
 	int (*load)(struct mddev *mddev);
 	void (*destroy)(struct mddev *mddev);
+	void (*flush)(struct mddev *mddev);
 };
 
 /* the bitmap API */
 void mddev_set_bitmap_ops(struct mddev *mddev);
 
 /* these are used only by md/bitmap */
-void md_bitmap_flush(struct mddev *mddev);
 
 void md_bitmap_print_sb(struct bitmap *bitmap);
 void md_bitmap_update_sb(struct bitmap *bitmap);
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 15e830641c0c..46ffba143990 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -6463,7 +6463,8 @@ static void __md_stop_writes(struct mddev *mddev)
 		mddev->pers->quiesce(mddev, 1);
 		mddev->pers->quiesce(mddev, 0);
 	}
-	md_bitmap_flush(mddev);
+
+	mddev->bitmap_ops->flush(mddev);
 
 	if (md_is_rdwr(mddev) &&
 	    ((!mddev->in_sync && !mddev_is_clustered(mddev)) ||
-- 
2.39.2

[PATCH md-6.12 16/41] md/md-bitmap: make md_bitmap_print_sb() internal

[Yu Kuai]

From: Yu Kuai <yukuai3@huawei.com>

md_bitmap_print_sb() is only used inside md-bitmap.c, hence make it
static, also rename it to bitmap_print_sb.

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
---
 drivers/md/md-bitmap.c | 5 ++---
 drivers/md/md-bitmap.h | 1 -
 2 files changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/md/md-bitmap.c b/drivers/md/md-bitmap.c
index 324b676ac927..20f5fdd7396f 100644
--- a/drivers/md/md-bitmap.c
+++ b/drivers/md/md-bitmap.c
@@ -512,8 +512,7 @@ void md_bitmap_update_sb(struct bitmap *bitmap)
 }
 EXPORT_SYMBOL(md_bitmap_update_sb);
 
-/* print out the bitmap file superblock */
-void md_bitmap_print_sb(struct bitmap *bitmap)
+static void bitmap_print_sb(struct bitmap *bitmap)
 {
 	bitmap_super_t *sb;
 
@@ -760,7 +759,7 @@ static int md_bitmap_read_sb(struct bitmap *bitmap)
 			bitmap->mddev->bitmap_info.space > sectors_reserved)
 			bitmap->mddev->bitmap_info.space = sectors_reserved;
 	} else {
-		md_bitmap_print_sb(bitmap);
+		bitmap_print_sb(bitmap);
 		if (bitmap->cluster_slot < 0)
 			md_cluster_stop(bitmap->mddev);
 	}
diff --git a/drivers/md/md-bitmap.h b/drivers/md/md-bitmap.h
index c0858665554e..5d5811c89b77 100644
--- a/drivers/md/md-bitmap.h
+++ b/drivers/md/md-bitmap.h
@@ -258,7 +258,6 @@ void mddev_set_bitmap_ops(struct mddev *mddev);
 
 /* these are used only by md/bitmap */
 
-void md_bitmap_print_sb(struct bitmap *bitmap);
 void md_bitmap_update_sb(struct bitmap *bitmap);
 int md_bitmap_get_stats(struct bitmap *bitmap, struct md_bitmap_stats *stats);
 
-- 
2.39.2

[PATCH md-6.12 17/41] md/md-bitmap: merge md_bitmap_update_sb() into bitmap_operations

[Yu Kuai]

From: Yu Kuai <yukuai3@huawei.com>

So that the implementation won't be exposed, and it'll be possible
to invent a new bitmap by replacing bitmap_operations.

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
---
 drivers/md/md-bitmap.c  | 15 ++++++++-------
 drivers/md/md-bitmap.h  |  3 ++-
 drivers/md/md-cluster.c |  2 +-
 drivers/md/md.c         |  4 ++--
 4 files changed, 13 insertions(+), 11 deletions(-)

diff --git a/drivers/md/md-bitmap.c b/drivers/md/md-bitmap.c
index 20f5fdd7396f..8008a5ab7b6a 100644
--- a/drivers/md/md-bitmap.c
+++ b/drivers/md/md-bitmap.c
@@ -472,7 +472,7 @@ static void md_bitmap_wait_writes(struct bitmap *bitmap)
 
 
 /* update the event counter and sync the superblock to disk */
-void md_bitmap_update_sb(struct bitmap *bitmap)
+static void bitmap_update_sb(struct bitmap *bitmap)
 {
 	bitmap_super_t *sb;
 
@@ -510,7 +510,6 @@ void md_bitmap_update_sb(struct bitmap *bitmap)
 		write_sb_page(bitmap, bitmap->storage.sb_index,
 			      bitmap->storage.sb_page, 1);
 }
-EXPORT_SYMBOL(md_bitmap_update_sb);
 
 static void bitmap_print_sb(struct bitmap *bitmap)
 {
@@ -892,7 +891,7 @@ static void md_bitmap_file_unmap(struct bitmap_storage *store)
 static void md_bitmap_file_kick(struct bitmap *bitmap)
 {
 	if (!test_and_set_bit(BITMAP_STALE, &bitmap->flags)) {
-		md_bitmap_update_sb(bitmap);
+		bitmap_update_sb(bitmap);
 
 		if (bitmap->storage.file) {
 			pr_warn("%s: kicking failed bitmap file %pD4 from array!\n",
@@ -1792,7 +1791,7 @@ static void bitmap_flush(struct mddev *mddev)
 	md_bitmap_daemon_work(mddev);
 	if (mddev->bitmap_info.external)
 		md_super_wait(mddev);
-	md_bitmap_update_sb(bitmap);
+	bitmap_update_sb(bitmap);
 }
 
 /*
@@ -2022,7 +2021,7 @@ static int bitmap_load(struct mddev *mddev)
 	mddev_set_timeout(mddev, mddev->bitmap_info.daemon_sleep, true);
 	md_wakeup_thread(mddev->thread);
 
-	md_bitmap_update_sb(bitmap);
+	bitmap_update_sb(bitmap);
 
 	if (test_bit(BITMAP_WRITE_ERROR, &bitmap->flags))
 		err = -EIO;
@@ -2083,7 +2082,7 @@ int md_bitmap_copy_from_slot(struct mddev *mddev, int slot,
 	}
 
 	if (clear_bits) {
-		md_bitmap_update_sb(bitmap);
+		bitmap_update_sb(bitmap);
 		/* BITMAP_PAGE_PENDING is set, but bitmap_unplug needs
 		 * BITMAP_PAGE_DIRTY or _NEEDWRITE to write ... */
 		for (i = 0; i < bitmap->storage.file_pages; i++)
@@ -2578,7 +2577,7 @@ backlog_store(struct mddev *mddev, const char *buf, size_t len)
 			mddev_create_serial_pool(mddev, rdev);
 	}
 	if (old_mwb != backlog)
-		md_bitmap_update_sb(mddev->bitmap);
+		bitmap_update_sb(mddev->bitmap);
 
 	mddev_unlock_and_resume(mddev);
 	return len;
@@ -2722,6 +2721,8 @@ static struct bitmap_operations bitmap_ops = {
 	.load			= bitmap_load,
 	.destroy		= bitmap_destroy,
 	.flush			= bitmap_flush,
+
+	.update_sb		= bitmap_update_sb,
 };
 
 void mddev_set_bitmap_ops(struct mddev *mddev)
diff --git a/drivers/md/md-bitmap.h b/drivers/md/md-bitmap.h
index 5d5811c89b77..ca0d8696136f 100644
--- a/drivers/md/md-bitmap.h
+++ b/drivers/md/md-bitmap.h
@@ -251,6 +251,8 @@ struct bitmap_operations {
 	int (*load)(struct mddev *mddev);
 	void (*destroy)(struct mddev *mddev);
 	void (*flush)(struct mddev *mddev);
+
+	void (*update_sb)(struct bitmap *bitmap);
 };
 
 /* the bitmap API */
@@ -258,7 +260,6 @@ void mddev_set_bitmap_ops(struct mddev *mddev);
 
 /* these are used only by md/bitmap */
 
-void md_bitmap_update_sb(struct bitmap *bitmap);
 int md_bitmap_get_stats(struct bitmap *bitmap, struct md_bitmap_stats *stats);
 
 int  md_bitmap_setallbits(struct bitmap *bitmap);
diff --git a/drivers/md/md-cluster.c b/drivers/md/md-cluster.c
index 59f7fbca783b..ca30881556bd 100644
--- a/drivers/md/md-cluster.c
+++ b/drivers/md/md-cluster.c
@@ -1255,7 +1255,7 @@ static int cluster_check_sync_size(struct mddev *mddev)
 		bm_lockres->flags |= DLM_LKF_NOQUEUE;
 		rv = dlm_lock_sync(bm_lockres, DLM_LOCK_PW);
 		if (!rv)
-			md_bitmap_update_sb(bitmap);
+			mddev->bitmap_ops->update_sb(bitmap);
 		lockres_free(bm_lockres);
 
 		rv = md_bitmap_get_stats(bitmap, &stats);
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 46ffba143990..ce92fe943f61 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -2838,7 +2838,7 @@ void md_update_sb(struct mddev *mddev, int force_change)
 
 	mddev_add_trace_msg(mddev, "md md_update_sb");
 rewrite:
-	md_bitmap_update_sb(mddev->bitmap);
+	mddev->bitmap_ops->update_sb(mddev->bitmap);
 	rdev_for_each(rdev, mddev) {
 		if (rdev->sb_loaded != 1)
 			continue; /* no noise on spare devices */
@@ -10003,7 +10003,7 @@ static void check_sb_changes(struct mddev *mddev, struct md_rdev *rdev)
 		if (ret)
 			pr_info("md-cluster: resize failed\n");
 		else
-			md_bitmap_update_sb(mddev->bitmap);
+			mddev->bitmap_ops->update_sb(mddev->bitmap);
 	}
 
 	/* Check for change of roles in the active devices */
-- 
2.39.2

[PATCH md-6.12 18/41] md/md-bitmap: merge md_bitmap_status() into bitmap_operations

[Yu Kuai]

From: Yu Kuai <yukuai3@huawei.com>

So that the implementation won't be exposed, and it'll be possible
to invent a new bitmap by replacing bitmap_operations.

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
---
 drivers/md/md-bitmap.c  |  4 ++--
 drivers/md/md-bitmap.h  |  3 +--
 drivers/md/md-cluster.c |  8 ++++----
 drivers/md/md.c         | 11 ++++++-----
 drivers/md/raid1.c      |  2 +-
 5 files changed, 14 insertions(+), 14 deletions(-)

diff --git a/drivers/md/md-bitmap.c b/drivers/md/md-bitmap.c
index 8008a5ab7b6a..e1ae50c7a551 100644
--- a/drivers/md/md-bitmap.c
+++ b/drivers/md/md-bitmap.c
@@ -2105,7 +2105,7 @@ void md_bitmap_set_pages(struct bitmap *bitmap, unsigned long pages)
 }
 EXPORT_SYMBOL_GPL(md_bitmap_set_pages);
 
-int md_bitmap_get_stats(struct bitmap *bitmap, struct md_bitmap_stats *stats)
+static int bitmap_get_stats(struct bitmap *bitmap, struct md_bitmap_stats *stats)
 {
 	struct bitmap_storage *storage;
 	struct bitmap_counts *counts;
@@ -2131,7 +2131,6 @@ int md_bitmap_get_stats(struct bitmap *bitmap, struct md_bitmap_stats *stats)
 	stats->events_cleared = bitmap->events_cleared;
 	return 0;
 }
-EXPORT_SYMBOL_GPL(md_bitmap_get_stats);
 
 int md_bitmap_resize(struct bitmap *bitmap, sector_t blocks,
 		  int chunksize, int init)
@@ -2723,6 +2722,7 @@ static struct bitmap_operations bitmap_ops = {
 	.flush			= bitmap_flush,
 
 	.update_sb		= bitmap_update_sb,
+	.get_stats		= bitmap_get_stats,
 };
 
 void mddev_set_bitmap_ops(struct mddev *mddev)
diff --git a/drivers/md/md-bitmap.h b/drivers/md/md-bitmap.h
index ca0d8696136f..1df238cb82f0 100644
--- a/drivers/md/md-bitmap.h
+++ b/drivers/md/md-bitmap.h
@@ -253,6 +253,7 @@ struct bitmap_operations {
 	void (*flush)(struct mddev *mddev);
 
 	void (*update_sb)(struct bitmap *bitmap);
+	int (*get_stats)(struct bitmap *bitmap, struct md_bitmap_stats *stats);
 };
 
 /* the bitmap API */
@@ -260,8 +261,6 @@ void mddev_set_bitmap_ops(struct mddev *mddev);
 
 /* these are used only by md/bitmap */
 
-int md_bitmap_get_stats(struct bitmap *bitmap, struct md_bitmap_stats *stats);
-
 int  md_bitmap_setallbits(struct bitmap *bitmap);
 void md_bitmap_write_all(struct bitmap *bitmap);
 
diff --git a/drivers/md/md-cluster.c b/drivers/md/md-cluster.c
index ca30881556bd..a5f1135cc1fa 100644
--- a/drivers/md/md-cluster.c
+++ b/drivers/md/md-cluster.c
@@ -1148,7 +1148,7 @@ static int resize_bitmaps(struct mddev *mddev, sector_t newsize, sector_t oldsiz
 	unsigned long my_pages;
 	int i, rv;
 
-	rv = md_bitmap_get_stats(bitmap, &stats);
+	rv = mddev->bitmap_ops->get_stats(bitmap, &stats);
 	if (rv)
 		return rv;
 
@@ -1175,7 +1175,7 @@ static int resize_bitmaps(struct mddev *mddev, sector_t newsize, sector_t oldsiz
 			goto out;
 		}
 
-		rv = md_bitmap_get_stats(bitmap, &stats);
+		rv = mddev->bitmap_ops->get_stats(bitmap, &stats);
 		if (rv)
 			goto out;
 		/*
@@ -1225,7 +1225,7 @@ static int cluster_check_sync_size(struct mddev *mddev)
 	char str[64];
 	int i, rv;
 
-	rv = md_bitmap_get_stats(bitmap, &stats);
+	rv = mddev->bitmap_ops->get_stats(bitmap, &stats);
 	if (rv)
 		return rv;
 
@@ -1258,7 +1258,7 @@ static int cluster_check_sync_size(struct mddev *mddev)
 			mddev->bitmap_ops->update_sb(bitmap);
 		lockres_free(bm_lockres);
 
-		rv = md_bitmap_get_stats(bitmap, &stats);
+		rv = mddev->bitmap_ops->get_stats(bitmap, &stats);
 		if (rv) {
 			md_bitmap_free(bitmap);
 			return rv;
diff --git a/drivers/md/md.c b/drivers/md/md.c
index ce92fe943f61..3a612094bc2d 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -1378,7 +1378,7 @@ static u64 md_bitmap_events_cleared(struct mddev *mddev)
 	struct md_bitmap_stats stats;
 	int err;
 
-	err = md_bitmap_get_stats(mddev->bitmap, &stats);
+	err = mddev->bitmap_ops->get_stats(mddev->bitmap, &stats);
 	if (err)
 		return 0;
 
@@ -2354,11 +2354,12 @@ super_1_allow_new_offset(struct md_rdev *rdev,
 		return 0;
 
 	if (!rdev->mddev->bitmap_info.file) {
+		struct mddev *mddev = rdev->mddev;
 		struct md_bitmap_stats stats;
 		int err;
 
-		err = md_bitmap_get_stats(rdev->mddev->bitmap, &stats);
-		if (!err && rdev->sb_start + rdev->mddev->bitmap_info.offset +
+		err = mddev->bitmap_ops->get_stats(mddev->bitmap, &stats);
+		if (!err && rdev->sb_start + mddev->bitmap_info.offset +
 		    stats.file_pages * (PAGE_SIZE >> 9) > new_offset)
 			return 0;
 	}
@@ -7588,7 +7589,7 @@ static int update_array_info(struct mddev *mddev, mdu_array_info_t *info)
 		} else {
 			struct md_bitmap_stats stats;
 
-			rv = md_bitmap_get_stats(mddev->bitmap, &stats);
+			rv = mddev->bitmap_ops->get_stats(mddev->bitmap, &stats);
 			if (rv)
 				goto err;
 
@@ -8388,7 +8389,7 @@ static void md_bitmap_status(struct seq_file *seq, struct mddev *mddev)
 	unsigned long chunk_kb;
 	int err;
 
-	err = md_bitmap_get_stats(mddev->bitmap, &stats);
+	err = mddev->bitmap_ops->get_stats(mddev->bitmap, &stats);
 	if (err)
 		return;
 
diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index f9861f9103c2..d0bc5565057e 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -1612,7 +1612,7 @@ static void raid1_write_request(struct mddev *mddev, struct bio *bio,
 			 * Not if there are too many, or cannot
 			 * allocate memory, or a reader on WriteMostly
 			 * is waiting for behind writes to flush */
-			err = md_bitmap_get_stats(bitmap, &stats);
+			err = mddev->bitmap_ops->get_stats(bitmap, &stats);
 			if (!err && write_behind && !stats.behind_wait &&
 			    stats.behind_writes < max_write_behind)
 				alloc_behind_master_bio(r1_bio, bio);
-- 
2.39.2

[PATCH md-6.12 19/41] md/md-bitmap: remove md_bitmap_setallbits()

[Yu Kuai]

From: Yu Kuai <yukuai3@huawei.com>

md_bitmap_setallbits() is not used, hence can be removed.

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
---
 drivers/md/md-bitmap.h | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/md/md-bitmap.h b/drivers/md/md-bitmap.h
index 1df238cb82f0..0bf16f0143ad 100644
--- a/drivers/md/md-bitmap.h
+++ b/drivers/md/md-bitmap.h
@@ -261,7 +261,6 @@ void mddev_set_bitmap_ops(struct mddev *mddev);
 
 /* these are used only by md/bitmap */
 
-int  md_bitmap_setallbits(struct bitmap *bitmap);
 void md_bitmap_write_all(struct bitmap *bitmap);
 
 void md_bitmap_dirty_bits(struct bitmap *bitmap, unsigned long s, unsigned long e);
-- 
2.39.2

[PATCH md-6.12 20/41] md/md-bitmap: merge bitmap_write_all() into bitmap_operations

[Yu Kuai]

From: Yu Kuai <yukuai3@huawei.com>

So that the implementation won't be exposed, and it'll be possible
to invent a new bitmap by replacing bitmap_operations.

Also change the parameter from bitmap to mddev, to avoid access
bitmap outside md-bitmap.c as much as possible.

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
---
 drivers/md/md-bitmap.c | 14 +++++++-------
 drivers/md/md-bitmap.h |  3 +--
 drivers/md/md.c        |  2 +-
 3 files changed, 9 insertions(+), 10 deletions(-)

diff --git a/drivers/md/md-bitmap.c b/drivers/md/md-bitmap.c
index e1ae50c7a551..f5ef058dcdce 100644
--- a/drivers/md/md-bitmap.c
+++ b/drivers/md/md-bitmap.c
@@ -1224,22 +1224,21 @@ static int md_bitmap_init_from_disk(struct bitmap *bitmap, sector_t start)
 	return ret;
 }
 
-void md_bitmap_write_all(struct bitmap *bitmap)
+/* just flag bitmap pages as needing to be written. */
+static void bitmap_write_all(struct mddev *mddev)
 {
-	/* We don't actually write all bitmap blocks here,
-	 * just flag them as needing to be written
-	 */
 	int i;
+	struct bitmap *bitmap = mddev->bitmap;
 
 	if (!bitmap || !bitmap->storage.filemap)
 		return;
+
+	/* Only one copy, so nothing needed */
 	if (bitmap->storage.file)
-		/* Only one copy, so nothing needed */
 		return;
 
 	for (i = 0; i < bitmap->storage.file_pages; i++)
-		set_page_attr(bitmap, i,
-			      BITMAP_PAGE_NEEDWRITE);
+		set_page_attr(bitmap, i, BITMAP_PAGE_NEEDWRITE);
 	bitmap->allclean = 0;
 }
 
@@ -2720,6 +2719,7 @@ static struct bitmap_operations bitmap_ops = {
 	.load			= bitmap_load,
 	.destroy		= bitmap_destroy,
 	.flush			= bitmap_flush,
+	.write_all		= bitmap_write_all,
 
 	.update_sb		= bitmap_update_sb,
 	.get_stats		= bitmap_get_stats,
diff --git a/drivers/md/md-bitmap.h b/drivers/md/md-bitmap.h
index 0bf16f0143ad..89cd60a7bb07 100644
--- a/drivers/md/md-bitmap.h
+++ b/drivers/md/md-bitmap.h
@@ -251,6 +251,7 @@ struct bitmap_operations {
 	int (*load)(struct mddev *mddev);
 	void (*destroy)(struct mddev *mddev);
 	void (*flush)(struct mddev *mddev);
+	void (*write_all)(struct mddev *mddev);
 
 	void (*update_sb)(struct bitmap *bitmap);
 	int (*get_stats)(struct bitmap *bitmap, struct md_bitmap_stats *stats);
@@ -261,8 +262,6 @@ void mddev_set_bitmap_ops(struct mddev *mddev);
 
 /* these are used only by md/bitmap */
 
-void md_bitmap_write_all(struct bitmap *bitmap);
-
 void md_bitmap_dirty_bits(struct bitmap *bitmap, unsigned long s, unsigned long e);
 
 /* these are exported */
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 3a612094bc2d..17350adb675f 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -9545,7 +9545,7 @@ static void md_start_sync(struct work_struct *ws)
 	 * stored on all devices. So make sure all bitmap pages get written.
 	 */
 	if (spares)
-		md_bitmap_write_all(mddev->bitmap);
+		mddev->bitmap_ops->write_all(mddev);
 
 	name = test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) ?
 			"reshape" : "resync";
-- 
2.39.2

[PATCH md-6.12 21/41] md/md-bitmap: merge md_bitmap_dirty_bits() into bitmap_operations

[Yu Kuai]

From: Yu Kuai <yukuai3@huawei.com>

So that the implementation won't be exposed, and it'll be possible
to invent a new bitmap by replacing bitmap_operations.

Also change the parameter from bitmap to mddev, to avoid access
bitmap outside md-bitmap.c as much as possible.

And while we're here, also fix coding style for bitmap_store().

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
---
 drivers/md/md-bitmap.c |  9 ++++++++-
 drivers/md/md-bitmap.h |  6 ++----
 drivers/md/md.c        | 14 ++++++++++----
 3 files changed, 20 insertions(+), 9 deletions(-)

diff --git a/drivers/md/md-bitmap.c b/drivers/md/md-bitmap.c
index f5ef058dcdce..540b06dcc488 100644
--- a/drivers/md/md-bitmap.c
+++ b/drivers/md/md-bitmap.c
@@ -1753,12 +1753,18 @@ static void md_bitmap_set_memory_bits(struct bitmap *bitmap, sector_t offset, in
 }
 
 /* dirty the memory and file bits for bitmap chunks "s" to "e" */
-void md_bitmap_dirty_bits(struct bitmap *bitmap, unsigned long s, unsigned long e)
+static void bitmap_dirty_bits(struct mddev *mddev, unsigned long s,
+			      unsigned long e)
 {
 	unsigned long chunk;
+	struct bitmap *bitmap = mddev->bitmap;
+
+	if (!bitmap)
+		return;
 
 	for (chunk = s; chunk <= e; chunk++) {
 		sector_t sec = (sector_t)chunk << bitmap->counts.chunkshift;
+
 		md_bitmap_set_memory_bits(bitmap, sec, 1);
 		md_bitmap_file_set_bit(bitmap, sec);
 		if (sec < bitmap->mddev->recovery_cp)
@@ -2720,6 +2726,7 @@ static struct bitmap_operations bitmap_ops = {
 	.destroy		= bitmap_destroy,
 	.flush			= bitmap_flush,
 	.write_all		= bitmap_write_all,
+	.dirty_bits		= bitmap_dirty_bits,
 
 	.update_sb		= bitmap_update_sb,
 	.get_stats		= bitmap_get_stats,
diff --git a/drivers/md/md-bitmap.h b/drivers/md/md-bitmap.h
index 89cd60a7bb07..875ecbb5b1e4 100644
--- a/drivers/md/md-bitmap.h
+++ b/drivers/md/md-bitmap.h
@@ -252,6 +252,8 @@ struct bitmap_operations {
 	void (*destroy)(struct mddev *mddev);
 	void (*flush)(struct mddev *mddev);
 	void (*write_all)(struct mddev *mddev);
+	void (*dirty_bits)(struct mddev *mddev, unsigned long s,
+			   unsigned long e);
 
 	void (*update_sb)(struct bitmap *bitmap);
 	int (*get_stats)(struct bitmap *bitmap, struct md_bitmap_stats *stats);
@@ -260,10 +262,6 @@ struct bitmap_operations {
 /* the bitmap API */
 void mddev_set_bitmap_ops(struct mddev *mddev);
 
-/* these are used only by md/bitmap */
-
-void md_bitmap_dirty_bits(struct bitmap *bitmap, unsigned long s, unsigned long e);
-
 /* these are exported */
 int md_bitmap_startwrite(struct bitmap *bitmap, sector_t offset,
 			 unsigned long sectors, int behind);
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 17350adb675f..6cf0131b9b81 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -4699,14 +4699,20 @@ bitmap_store(struct mddev *mddev, const char *buf, size_t len)
 	/* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
 	while (*buf) {
 		chunk = end_chunk = simple_strtoul(buf, &end, 0);
-		if (buf == end) break;
+		if (buf == end)
+			break;
+
 		if (*end == '-') { /* range */
 			buf = end + 1;
 			end_chunk = simple_strtoul(buf, &end, 0);
-			if (buf == end) break;
+			if (buf == end)
+				break;
 		}
-		if (*end && !isspace(*end)) break;
-		md_bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
+
+		if (*end && !isspace(*end))
+			break;
+
+		mddev->bitmap_ops->dirty_bits(mddev, chunk, end_chunk);
 		buf = skip_spaces(end);
 	}
 	md_bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
-- 
2.39.2

[PATCH md-6.12 22/41] md/md-bitmap: merge md_bitmap_startwrite() into bitmap_operations

[Yu Kuai]

From: Yu Kuai <yukuai3@huawei.com>

So that the implementation won't be exposed, and it'll be possible
to invent a new bitmap by replacing bitmap_operations.

Also change the parameter from bitmap to mddev, to avoid access
bitmap outside md-bitmap.c as much as possible. And change the type
of 'behind' from int to bool.

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
---
 drivers/md/md-bitmap.c |  8 ++++++--
 drivers/md/md-bitmap.h |  5 +++--
 drivers/md/raid1.c     |  5 +++--
 drivers/md/raid10.c    |  3 ++-
 drivers/md/raid5.c     | 13 +++++--------
 5 files changed, 19 insertions(+), 15 deletions(-)

diff --git a/drivers/md/md-bitmap.c b/drivers/md/md-bitmap.c
index 540b06dcc488..17e5ab0fc373 100644
--- a/drivers/md/md-bitmap.c
+++ b/drivers/md/md-bitmap.c
@@ -1458,8 +1458,11 @@ __acquires(bitmap->lock)
 			&(bitmap->bp[page].map[pageoff]);
 }
 
-int md_bitmap_startwrite(struct bitmap *bitmap, sector_t offset, unsigned long sectors, int behind)
+static int bitmap_startwrite(struct mddev *mddev, sector_t offset,
+			     unsigned long sectors, bool behind)
 {
+	struct bitmap *bitmap = mddev->bitmap;
+
 	if (!bitmap)
 		return 0;
 
@@ -1520,7 +1523,6 @@ int md_bitmap_startwrite(struct bitmap *bitmap, sector_t offset, unsigned long s
 	}
 	return 0;
 }
-EXPORT_SYMBOL(md_bitmap_startwrite);
 
 void md_bitmap_endwrite(struct bitmap *bitmap, sector_t offset,
 			unsigned long sectors, int success, int behind)
@@ -2728,6 +2730,8 @@ static struct bitmap_operations bitmap_ops = {
 	.write_all		= bitmap_write_all,
 	.dirty_bits		= bitmap_dirty_bits,
 
+	.startwrite		= bitmap_startwrite,
+
 	.update_sb		= bitmap_update_sb,
 	.get_stats		= bitmap_get_stats,
 };
diff --git a/drivers/md/md-bitmap.h b/drivers/md/md-bitmap.h
index 875ecbb5b1e4..1433d13e447a 100644
--- a/drivers/md/md-bitmap.h
+++ b/drivers/md/md-bitmap.h
@@ -255,6 +255,9 @@ struct bitmap_operations {
 	void (*dirty_bits)(struct mddev *mddev, unsigned long s,
 			   unsigned long e);
 
+	int (*startwrite)(struct mddev *mddev, sector_t offset,
+			  unsigned long sectors, bool behind);
+
 	void (*update_sb)(struct bitmap *bitmap);
 	int (*get_stats)(struct bitmap *bitmap, struct md_bitmap_stats *stats);
 };
@@ -263,8 +266,6 @@ struct bitmap_operations {
 void mddev_set_bitmap_ops(struct mddev *mddev);
 
 /* these are exported */
-int md_bitmap_startwrite(struct bitmap *bitmap, sector_t offset,
-			 unsigned long sectors, int behind);
 void md_bitmap_endwrite(struct bitmap *bitmap, sector_t offset,
 			unsigned long sectors, int success, int behind);
 int md_bitmap_start_sync(struct bitmap *bitmap, sector_t offset, sector_t *blocks, int degraded);
diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index d0bc5565057e..d8d425668680 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -1617,8 +1617,9 @@ static void raid1_write_request(struct mddev *mddev, struct bio *bio,
 			    stats.behind_writes < max_write_behind)
 				alloc_behind_master_bio(r1_bio, bio);
 
-			md_bitmap_startwrite(bitmap, r1_bio->sector, r1_bio->sectors,
-					     test_bit(R1BIO_BehindIO, &r1_bio->state));
+			mddev->bitmap_ops->startwrite(
+				mddev, r1_bio->sector, r1_bio->sectors,
+				test_bit(R1BIO_BehindIO, &r1_bio->state));
 			first_clone = 0;
 		}
 
diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index e55e020b5571..8f9172c3329a 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -1492,7 +1492,8 @@ static void raid10_write_request(struct mddev *mddev, struct bio *bio,
 	md_account_bio(mddev, &bio);
 	r10_bio->master_bio = bio;
 	atomic_set(&r10_bio->remaining, 1);
-	md_bitmap_startwrite(mddev->bitmap, r10_bio->sector, r10_bio->sectors, 0);
+	mddev->bitmap_ops->startwrite(mddev, r10_bio->sector, r10_bio->sectors,
+				      false);
 
 	for (i = 0; i < conf->copies; i++) {
 		if (r10_bio->devs[i].bio)
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index c14cf2410365..c24036d1e6da 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -3563,8 +3563,8 @@ static void __add_stripe_bio(struct stripe_head *sh, struct bio *bi,
 		 */
 		set_bit(STRIPE_BITMAP_PENDING, &sh->state);
 		spin_unlock_irq(&sh->stripe_lock);
-		md_bitmap_startwrite(conf->mddev->bitmap, sh->sector,
-				     RAID5_STRIPE_SECTORS(conf), 0);
+		conf->mddev->bitmap_ops->startwrite(conf->mddev, sh->sector,
+					RAID5_STRIPE_SECTORS(conf), false);
 		spin_lock_irq(&sh->stripe_lock);
 		clear_bit(STRIPE_BITMAP_PENDING, &sh->state);
 		if (!sh->batch_head) {
@@ -5788,13 +5788,10 @@ static void make_discard_request(struct mddev *mddev, struct bio *bi)
 		}
 		spin_unlock_irq(&sh->stripe_lock);
 		if (conf->mddev->bitmap) {
-			for (d = 0;
-			     d < conf->raid_disks - conf->max_degraded;
+			for (d = 0; d < conf->raid_disks - conf->max_degraded;
 			     d++)
-				md_bitmap_startwrite(mddev->bitmap,
-						     sh->sector,
-						     RAID5_STRIPE_SECTORS(conf),
-						     0);
+				mddev->bitmap_ops->startwrite(mddev, sh->sector,
+					RAID5_STRIPE_SECTORS(conf), false);
 			sh->bm_seq = conf->seq_flush + 1;
 			set_bit(STRIPE_BIT_DELAY, &sh->state);
 		}
-- 
2.39.2

[PATCH md-6.12 23/41] md/md-bitmap: merge md_bitmap_endwrite() into bitmap_operations

[Yu Kuai]

From: Yu Kuai <yukuai3@huawei.com>

So that the implementation won't be exposed, and it'll be possible
to invent a new bitmap by replacing bitmap_operations.

Also change the parameter from bitmap to mddev, to avoid access
bitmap outside md-bitmap.c as much as possible. And change the type
of 'success' and 'behind' from int to bool.

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
---
 drivers/md/md-bitmap.c   |  9 ++++++---
 drivers/md/md-bitmap.h   |  4 ++--
 drivers/md/raid1.c       | 12 +++++++-----
 drivers/md/raid10.c      | 11 ++++++-----
 drivers/md/raid5-cache.c |  8 ++++----
 drivers/md/raid5.c       | 18 ++++++++++--------
 6 files changed, 35 insertions(+), 27 deletions(-)

diff --git a/drivers/md/md-bitmap.c b/drivers/md/md-bitmap.c
index 17e5ab0fc373..cab02c17aa29 100644
--- a/drivers/md/md-bitmap.c
+++ b/drivers/md/md-bitmap.c
@@ -1524,11 +1524,14 @@ static int bitmap_startwrite(struct mddev *mddev, sector_t offset,
 	return 0;
 }
 
-void md_bitmap_endwrite(struct bitmap *bitmap, sector_t offset,
-			unsigned long sectors, int success, int behind)
+static void bitmap_endwrite(struct mddev *mddev, sector_t offset,
+			    unsigned long sectors, bool success, bool behind)
 {
+	struct bitmap *bitmap = mddev->bitmap;
+
 	if (!bitmap)
 		return;
+
 	if (behind) {
 		if (atomic_dec_and_test(&bitmap->behind_writes))
 			wake_up(&bitmap->behind_wait);
@@ -1575,7 +1578,6 @@ void md_bitmap_endwrite(struct bitmap *bitmap, sector_t offset,
 			sectors = 0;
 	}
 }
-EXPORT_SYMBOL(md_bitmap_endwrite);
 
 static int __bitmap_start_sync(struct bitmap *bitmap, sector_t offset, sector_t *blocks,
 			       int degraded)
@@ -2731,6 +2733,7 @@ static struct bitmap_operations bitmap_ops = {
 	.dirty_bits		= bitmap_dirty_bits,
 
 	.startwrite		= bitmap_startwrite,
+	.endwrite		= bitmap_endwrite,
 
 	.update_sb		= bitmap_update_sb,
 	.get_stats		= bitmap_get_stats,
diff --git a/drivers/md/md-bitmap.h b/drivers/md/md-bitmap.h
index 1433d13e447a..056a80ee500f 100644
--- a/drivers/md/md-bitmap.h
+++ b/drivers/md/md-bitmap.h
@@ -257,6 +257,8 @@ struct bitmap_operations {
 
 	int (*startwrite)(struct mddev *mddev, sector_t offset,
 			  unsigned long sectors, bool behind);
+	void (*endwrite)(struct mddev *mddev, sector_t offset,
+			 unsigned long sectors, bool success, bool behind);
 
 	void (*update_sb)(struct bitmap *bitmap);
 	int (*get_stats)(struct bitmap *bitmap, struct md_bitmap_stats *stats);
@@ -266,8 +268,6 @@ struct bitmap_operations {
 void mddev_set_bitmap_ops(struct mddev *mddev);
 
 /* these are exported */
-void md_bitmap_endwrite(struct bitmap *bitmap, sector_t offset,
-			unsigned long sectors, int success, int behind);
 int md_bitmap_start_sync(struct bitmap *bitmap, sector_t offset, sector_t *blocks, int degraded);
 void md_bitmap_end_sync(struct bitmap *bitmap, sector_t offset, sector_t *blocks, int aborted);
 void md_bitmap_close_sync(struct bitmap *bitmap);
diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index d8d425668680..0734925dd203 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -411,18 +411,20 @@ static void raid1_end_read_request(struct bio *bio)
 
 static void close_write(struct r1bio *r1_bio)
 {
+	struct mddev *mddev = r1_bio->mddev;
+
 	/* it really is the end of this request */
 	if (test_bit(R1BIO_BehindIO, &r1_bio->state)) {
 		bio_free_pages(r1_bio->behind_master_bio);
 		bio_put(r1_bio->behind_master_bio);
 		r1_bio->behind_master_bio = NULL;
 	}
+
 	/* clear the bitmap if all writes complete successfully */
-	md_bitmap_endwrite(r1_bio->mddev->bitmap, r1_bio->sector,
-			   r1_bio->sectors,
-			   !test_bit(R1BIO_Degraded, &r1_bio->state),
-			   test_bit(R1BIO_BehindIO, &r1_bio->state));
-	md_write_end(r1_bio->mddev);
+	mddev->bitmap_ops->endwrite(mddev, r1_bio->sector, r1_bio->sectors,
+				    !test_bit(R1BIO_Degraded, &r1_bio->state),
+				    test_bit(R1BIO_BehindIO, &r1_bio->state));
+	md_write_end(mddev);
 }
 
 static void r1_bio_write_done(struct r1bio *r1_bio)
diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 8f9172c3329a..ce28150e0464 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -426,12 +426,13 @@ static void raid10_end_read_request(struct bio *bio)
 
 static void close_write(struct r10bio *r10_bio)
 {
+	struct mddev *mddev = r10_bio->mddev;
+
 	/* clear the bitmap if all writes complete successfully */
-	md_bitmap_endwrite(r10_bio->mddev->bitmap, r10_bio->sector,
-			   r10_bio->sectors,
-			   !test_bit(R10BIO_Degraded, &r10_bio->state),
-			   0);
-	md_write_end(r10_bio->mddev);
+	mddev->bitmap_ops->endwrite(mddev, r10_bio->sector, r10_bio->sectors,
+				    !test_bit(R10BIO_Degraded, &r10_bio->state),
+				    false);
+	md_write_end(mddev);
 }
 
 static void one_write_done(struct r10bio *r10_bio)
diff --git a/drivers/md/raid5-cache.c b/drivers/md/raid5-cache.c
index 874874fe4fa1..23f2cbcf1a6c 100644
--- a/drivers/md/raid5-cache.c
+++ b/drivers/md/raid5-cache.c
@@ -313,10 +313,10 @@ void r5c_handle_cached_data_endio(struct r5conf *conf,
 		if (sh->dev[i].written) {
 			set_bit(R5_UPTODATE, &sh->dev[i].flags);
 			r5c_return_dev_pending_writes(conf, &sh->dev[i]);
-			md_bitmap_endwrite(conf->mddev->bitmap, sh->sector,
-					   RAID5_STRIPE_SECTORS(conf),
-					   !test_bit(STRIPE_DEGRADED, &sh->state),
-					   0);
+			conf->mddev->bitmap_ops->endwrite(conf->mddev,
+					sh->sector, RAID5_STRIPE_SECTORS(conf),
+					!test_bit(STRIPE_DEGRADED, &sh->state),
+					false);
 		}
 	}
 }
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index c24036d1e6da..93d582b9f922 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -3663,8 +3663,9 @@ handle_failed_stripe(struct r5conf *conf, struct stripe_head *sh,
 			bi = nextbi;
 		}
 		if (bitmap_end)
-			md_bitmap_endwrite(conf->mddev->bitmap, sh->sector,
-					   RAID5_STRIPE_SECTORS(conf), 0, 0);
+			conf->mddev->bitmap_ops->endwrite(conf->mddev,
+					sh->sector, RAID5_STRIPE_SECTORS(conf),
+					false, false);
 		bitmap_end = 0;
 		/* and fail all 'written' */
 		bi = sh->dev[i].written;
@@ -3709,8 +3710,9 @@ handle_failed_stripe(struct r5conf *conf, struct stripe_head *sh,
 			}
 		}
 		if (bitmap_end)
-			md_bitmap_endwrite(conf->mddev->bitmap, sh->sector,
-					   RAID5_STRIPE_SECTORS(conf), 0, 0);
+			conf->mddev->bitmap_ops->endwrite(conf->mddev,
+					sh->sector, RAID5_STRIPE_SECTORS(conf),
+					false, false);
 		/* If we were in the middle of a write the parity block might
 		 * still be locked - so just clear all R5_LOCKED flags
 		 */
@@ -4059,10 +4061,10 @@ static void handle_stripe_clean_event(struct r5conf *conf,
 					bio_endio(wbi);
 					wbi = wbi2;
 				}
-				md_bitmap_endwrite(conf->mddev->bitmap, sh->sector,
-						   RAID5_STRIPE_SECTORS(conf),
-						   !test_bit(STRIPE_DEGRADED, &sh->state),
-						   0);
+				conf->mddev->bitmap_ops->endwrite(conf->mddev,
+					sh->sector, RAID5_STRIPE_SECTORS(conf),
+					!test_bit(STRIPE_DEGRADED, &sh->state),
+					false);
 				if (head_sh->batch_head) {
 					sh = list_first_entry(&sh->batch_list,
 							      struct stripe_head,
-- 
2.39.2

[PATCH md-6.12 24/41] md/md-bitmap: merge md_bitmap_start_sync() into bitmap_operations

[Yu Kuai]

From: Yu Kuai <yukuai3@huawei.com>

So that the implementation won't be exposed, and it'll be possible
to invent a new bitmap by replacing bitmap_operations.

Also change the parameter from bitmap to mddev, to avoid access
bitmap outside md-bitmap.c as much as possible.

Also fix lots of code style.

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
---
 drivers/md/md-bitmap.c | 36 ++++++++++++++++++++----------------
 drivers/md/md-bitmap.h |  3 ++-
 drivers/md/raid1.c     | 10 +++++-----
 drivers/md/raid10.c    | 22 ++++++++++++----------
 drivers/md/raid5.c     | 10 ++++++----
 5 files changed, 45 insertions(+), 36 deletions(-)

diff --git a/drivers/md/md-bitmap.c b/drivers/md/md-bitmap.c
index cab02c17aa29..585a7d8d6e73 100644
--- a/drivers/md/md-bitmap.c
+++ b/drivers/md/md-bitmap.c
@@ -1579,24 +1579,26 @@ static void bitmap_endwrite(struct mddev *mddev, sector_t offset,
 	}
 }
 
-static int __bitmap_start_sync(struct bitmap *bitmap, sector_t offset, sector_t *blocks,
-			       int degraded)
+static bool __bitmap_start_sync(struct bitmap *bitmap, sector_t offset,
+				sector_t *blocks, bool degraded)
 {
 	bitmap_counter_t *bmc;
-	int rv;
+	bool rv;
+
 	if (bitmap == NULL) {/* FIXME or bitmap set as 'failed' */
 		*blocks = 1024;
-		return 1; /* always resync if no bitmap */
+		return true; /* always resync if no bitmap */
 	}
 	spin_lock_irq(&bitmap->counts.lock);
+
+	rv = false;
 	bmc = md_bitmap_get_counter(&bitmap->counts, offset, blocks, 0);
-	rv = 0;
 	if (bmc) {
 		/* locked */
-		if (RESYNC(*bmc))
-			rv = 1;
-		else if (NEEDED(*bmc)) {
-			rv = 1;
+		if (RESYNC(*bmc)) {
+			rv = true;
+		} else if (NEEDED(*bmc)) {
+			rv = true;
 			if (!degraded) { /* don't set/clear bits if degraded */
 				*bmc |= RESYNC_MASK;
 				*bmc &= ~NEEDED_MASK;
@@ -1604,11 +1606,12 @@ static int __bitmap_start_sync(struct bitmap *bitmap, sector_t offset, sector_t
 		}
 	}
 	spin_unlock_irq(&bitmap->counts.lock);
+
 	return rv;
 }
 
-int md_bitmap_start_sync(struct bitmap *bitmap, sector_t offset, sector_t *blocks,
-			 int degraded)
+static bool bitmap_start_sync(struct mddev *mddev, sector_t offset,
+			      sector_t *blocks, bool degraded)
 {
 	/* bitmap_start_sync must always report on multiples of whole
 	 * pages, otherwise resync (which is very PAGE_SIZE based) will
@@ -1617,19 +1620,19 @@ int md_bitmap_start_sync(struct bitmap *bitmap, sector_t offset, sector_t *block
 	 * At least PAGE_SIZE>>9 blocks are covered.
 	 * Return the 'or' of the result.
 	 */
-	int rv = 0;
+	bool rv = false;
 	sector_t blocks1;
 
 	*blocks = 0;
 	while (*blocks < (PAGE_SIZE>>9)) {
-		rv |= __bitmap_start_sync(bitmap, offset,
+		rv |= __bitmap_start_sync(mddev->bitmap, offset,
 					  &blocks1, degraded);
 		offset += blocks1;
 		*blocks += blocks1;
 	}
+
 	return rv;
 }
-EXPORT_SYMBOL(md_bitmap_start_sync);
 
 void md_bitmap_end_sync(struct bitmap *bitmap, sector_t offset, sector_t *blocks, int aborted)
 {
@@ -1723,7 +1726,7 @@ void md_bitmap_sync_with_cluster(struct mddev *mddev,
 	WARN((blocks > new_lo) && old_lo, "alignment is not correct for lo\n");
 
 	for (sector = old_hi; sector < new_hi; ) {
-		md_bitmap_start_sync(bitmap, sector, &blocks, 0);
+		bitmap_start_sync(mddev, sector, &blocks, false);
 		sector += blocks;
 	}
 	WARN((blocks > new_hi) && old_hi, "alignment is not correct for hi\n");
@@ -2005,7 +2008,7 @@ static int bitmap_load(struct mddev *mddev)
 	 */
 	while (sector < mddev->resync_max_sectors) {
 		sector_t blocks;
-		md_bitmap_start_sync(bitmap, sector, &blocks, 0);
+		bitmap_start_sync(mddev, sector, &blocks, false);
 		sector += blocks;
 	}
 	md_bitmap_close_sync(bitmap);
@@ -2734,6 +2737,7 @@ static struct bitmap_operations bitmap_ops = {
 
 	.startwrite		= bitmap_startwrite,
 	.endwrite		= bitmap_endwrite,
+	.start_sync		= bitmap_start_sync,
 
 	.update_sb		= bitmap_update_sb,
 	.get_stats		= bitmap_get_stats,
diff --git a/drivers/md/md-bitmap.h b/drivers/md/md-bitmap.h
index 056a80ee500f..67c8f22e8726 100644
--- a/drivers/md/md-bitmap.h
+++ b/drivers/md/md-bitmap.h
@@ -259,6 +259,8 @@ struct bitmap_operations {
 			  unsigned long sectors, bool behind);
 	void (*endwrite)(struct mddev *mddev, sector_t offset,
 			 unsigned long sectors, bool success, bool behind);
+	bool (*start_sync)(struct mddev *mddev, sector_t offset,
+			   sector_t *blocks, bool degraded);
 
 	void (*update_sb)(struct bitmap *bitmap);
 	int (*get_stats)(struct bitmap *bitmap, struct md_bitmap_stats *stats);
@@ -268,7 +270,6 @@ struct bitmap_operations {
 void mddev_set_bitmap_ops(struct mddev *mddev);
 
 /* these are exported */
-int md_bitmap_start_sync(struct bitmap *bitmap, sector_t offset, sector_t *blocks, int degraded);
 void md_bitmap_end_sync(struct bitmap *bitmap, sector_t offset, sector_t *blocks, int aborted);
 void md_bitmap_close_sync(struct bitmap *bitmap);
 void md_bitmap_cond_end_sync(struct bitmap *bitmap, sector_t sector, bool force);
diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index 0734925dd203..3e50f85852d0 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -2768,7 +2768,7 @@ static sector_t raid1_sync_request(struct mddev *mddev, sector_t sector_nr,
 	int wonly = -1;
 	int write_targets = 0, read_targets = 0;
 	sector_t sync_blocks;
-	int still_degraded = 0;
+	bool still_degraded = false;
 	int good_sectors = RESYNC_SECTORS;
 	int min_bad = 0; /* number of sectors that are bad in all devices */
 	int idx = sector_to_idx(sector_nr);
@@ -2810,7 +2810,7 @@ static sector_t raid1_sync_request(struct mddev *mddev, sector_t sector_nr,
 	/* before building a request, check if we can skip these blocks..
 	 * This call the bitmap_start_sync doesn't actually record anything
 	 */
-	if (!md_bitmap_start_sync(mddev->bitmap, sector_nr, &sync_blocks, 1) &&
+	if (!mddev->bitmap_ops->start_sync(mddev, sector_nr, &sync_blocks, true) &&
 	    !conf->fullsync && !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
 		/* We can skip this block, and probably several more */
 		*skipped = 1;
@@ -2861,7 +2861,7 @@ static sector_t raid1_sync_request(struct mddev *mddev, sector_t sector_nr,
 		if (rdev == NULL ||
 		    test_bit(Faulty, &rdev->flags)) {
 			if (i < conf->raid_disks)
-				still_degraded = 1;
+				still_degraded = true;
 		} else if (!test_bit(In_sync, &rdev->flags)) {
 			bio->bi_opf = REQ_OP_WRITE;
 			bio->bi_end_io = end_sync_write;
@@ -2985,8 +2985,8 @@ static sector_t raid1_sync_request(struct mddev *mddev, sector_t sector_nr,
 		if (len == 0)
 			break;
 		if (sync_blocks == 0) {
-			if (!md_bitmap_start_sync(mddev->bitmap, sector_nr,
-						  &sync_blocks, still_degraded) &&
+			if (!mddev->bitmap_ops->start_sync(mddev, sector_nr,
+						&sync_blocks, still_degraded) &&
 			    !conf->fullsync &&
 			    !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
 				break;
diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index ce28150e0464..d88878741ed4 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -3289,10 +3289,10 @@ static sector_t raid10_sync_request(struct mddev *mddev, sector_t sector_nr,
 		r10_bio = NULL;
 
 		for (i = 0 ; i < conf->geo.raid_disks; i++) {
-			int still_degraded;
+			bool still_degraded;
 			struct r10bio *rb2;
 			sector_t sect;
-			int must_sync;
+			bool must_sync;
 			int any_working;
 			struct raid10_info *mirror = &conf->mirrors[i];
 			struct md_rdev *mrdev, *mreplace;
@@ -3309,7 +3309,7 @@ static sector_t raid10_sync_request(struct mddev *mddev, sector_t sector_nr,
 			if (!mrdev && !mreplace)
 				continue;
 
-			still_degraded = 0;
+			still_degraded = false;
 			/* want to reconstruct this device */
 			rb2 = r10_bio;
 			sect = raid10_find_virt(conf, sector_nr, i);
@@ -3322,8 +3322,9 @@ static sector_t raid10_sync_request(struct mddev *mddev, sector_t sector_nr,
 			 * we only need to recover the block if it is set in
 			 * the bitmap
 			 */
-			must_sync = md_bitmap_start_sync(mddev->bitmap, sect,
-							 &sync_blocks, 1);
+			must_sync = mddev->bitmap_ops->start_sync(mddev, sect,
+								  &sync_blocks,
+								  true);
 			if (sync_blocks < max_sync)
 				max_sync = sync_blocks;
 			if (!must_sync &&
@@ -3361,13 +3362,13 @@ static sector_t raid10_sync_request(struct mddev *mddev, sector_t sector_nr,
 				struct md_rdev *rdev = conf->mirrors[j].rdev;
 
 				if (rdev == NULL || test_bit(Faulty, &rdev->flags)) {
-					still_degraded = 1;
+					still_degraded = false;
 					break;
 				}
 			}
 
-			must_sync = md_bitmap_start_sync(mddev->bitmap, sect,
-							 &sync_blocks, still_degraded);
+			must_sync = mddev->bitmap_ops->start_sync(mddev, sect,
+						&sync_blocks, still_degraded);
 
 			any_working = 0;
 			for (j=0; j<conf->copies;j++) {
@@ -3544,8 +3545,9 @@ static sector_t raid10_sync_request(struct mddev *mddev, sector_t sector_nr,
 					mddev_is_clustered(mddev) &&
 					(sector_nr + 2 * RESYNC_SECTORS > conf->cluster_sync_high));
 
-		if (!md_bitmap_start_sync(mddev->bitmap, sector_nr,
-					  &sync_blocks, mddev->degraded) &&
+		if (!mddev->bitmap_ops->start_sync(mddev, sector_nr,
+						   &sync_blocks,
+						   mddev->degraded) &&
 		    !conf->fullsync && !test_bit(MD_RECOVERY_REQUESTED,
 						 &mddev->recovery)) {
 			/* We can skip this block */
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 93d582b9f922..313904dd6555 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -6485,7 +6485,7 @@ static inline sector_t raid5_sync_request(struct mddev *mddev, sector_t sector_n
 	struct r5conf *conf = mddev->private;
 	struct stripe_head *sh;
 	sector_t sync_blocks;
-	int still_degraded = 0;
+	bool still_degraded = false;
 	int i;
 
 	if (sector_nr >= max_sector) {
@@ -6530,7 +6530,8 @@ static inline sector_t raid5_sync_request(struct mddev *mddev, sector_t sector_n
 	}
 	if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery) &&
 	    !conf->fullsync &&
-	    !md_bitmap_start_sync(mddev->bitmap, sector_nr, &sync_blocks, 1) &&
+	    !mddev->bitmap_ops->start_sync(mddev, sector_nr, &sync_blocks,
+					   true) &&
 	    sync_blocks >= RAID5_STRIPE_SECTORS(conf)) {
 		/* we can skip this block, and probably more */
 		do_div(sync_blocks, RAID5_STRIPE_SECTORS(conf));
@@ -6558,10 +6559,11 @@ static inline sector_t raid5_sync_request(struct mddev *mddev, sector_t sector_n
 		struct md_rdev *rdev = conf->disks[i].rdev;
 
 		if (rdev == NULL || test_bit(Faulty, &rdev->flags))
-			still_degraded = 1;
+			still_degraded = true;
 	}
 
-	md_bitmap_start_sync(mddev->bitmap, sector_nr, &sync_blocks, still_degraded);
+	mddev->bitmap_ops->start_sync(mddev, sector_nr, &sync_blocks,
+				      still_degraded);
 
 	set_bit(STRIPE_SYNC_REQUESTED, &sh->state);
 	set_bit(STRIPE_HANDLE, &sh->state);
-- 
2.39.2

[PATCH md-6.12 25/41] md/md-bitmap: remove the parameter 'aborted' for md_bitmap_end_sync()

[Yu Kuai]

From: Yu Kuai <yukuai3@huawei.com>

For internal callers, aborted are always set to false, while for
external callers, aborted are always set to true.

Hence there is no need to always pass in true for exported api.

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
---
 drivers/md/md-bitmap.c | 15 +++++++++++----
 drivers/md/md-bitmap.h |  3 ++-
 drivers/md/raid1.c     |  4 ++--
 drivers/md/raid10.c    |  4 ++--
 drivers/md/raid5.c     |  2 +-
 5 files changed, 18 insertions(+), 10 deletions(-)

diff --git a/drivers/md/md-bitmap.c b/drivers/md/md-bitmap.c
index 585a7d8d6e73..de837ce20f9e 100644
--- a/drivers/md/md-bitmap.c
+++ b/drivers/md/md-bitmap.c
@@ -1634,7 +1634,8 @@ static bool bitmap_start_sync(struct mddev *mddev, sector_t offset,
 	return rv;
 }
 
-void md_bitmap_end_sync(struct bitmap *bitmap, sector_t offset, sector_t *blocks, int aborted)
+static void __bitmap_end_sync(struct bitmap *bitmap, sector_t offset,
+			      sector_t *blocks, bool aborted)
 {
 	bitmap_counter_t *bmc;
 	unsigned long flags;
@@ -1663,6 +1664,12 @@ void md_bitmap_end_sync(struct bitmap *bitmap, sector_t offset, sector_t *blocks
  unlock:
 	spin_unlock_irqrestore(&bitmap->counts.lock, flags);
 }
+
+void md_bitmap_end_sync(struct bitmap *bitmap, sector_t offset,
+			sector_t *blocks)
+{
+	__bitmap_end_sync(bitmap, offset, blocks, true);
+}
 EXPORT_SYMBOL(md_bitmap_end_sync);
 
 void md_bitmap_close_sync(struct bitmap *bitmap)
@@ -1676,7 +1683,7 @@ void md_bitmap_close_sync(struct bitmap *bitmap)
 	if (!bitmap)
 		return;
 	while (sector < bitmap->mddev->resync_max_sectors) {
-		md_bitmap_end_sync(bitmap, sector, &blocks, 0);
+		__bitmap_end_sync(bitmap, sector, &blocks, false);
 		sector += blocks;
 	}
 }
@@ -1704,7 +1711,7 @@ void md_bitmap_cond_end_sync(struct bitmap *bitmap, sector_t sector, bool force)
 	sector &= ~((1ULL << bitmap->counts.chunkshift) - 1);
 	s = 0;
 	while (s < sector && s < bitmap->mddev->resync_max_sectors) {
-		md_bitmap_end_sync(bitmap, s, &blocks, 0);
+		__bitmap_end_sync(bitmap, s, &blocks, false);
 		s += blocks;
 	}
 	bitmap->last_end_sync = jiffies;
@@ -1720,7 +1727,7 @@ void md_bitmap_sync_with_cluster(struct mddev *mddev,
 	sector_t sector, blocks = 0;
 
 	for (sector = old_lo; sector < new_lo; ) {
-		md_bitmap_end_sync(bitmap, sector, &blocks, 0);
+		__bitmap_end_sync(bitmap, sector, &blocks, false);
 		sector += blocks;
 	}
 	WARN((blocks > new_lo) && old_lo, "alignment is not correct for lo\n");
diff --git a/drivers/md/md-bitmap.h b/drivers/md/md-bitmap.h
index 67c8f22e8726..6691524bdc80 100644
--- a/drivers/md/md-bitmap.h
+++ b/drivers/md/md-bitmap.h
@@ -270,7 +270,8 @@ struct bitmap_operations {
 void mddev_set_bitmap_ops(struct mddev *mddev);
 
 /* these are exported */
-void md_bitmap_end_sync(struct bitmap *bitmap, sector_t offset, sector_t *blocks, int aborted);
+void md_bitmap_end_sync(struct bitmap *bitmap, sector_t offset,
+			sector_t *blocks);
 void md_bitmap_close_sync(struct bitmap *bitmap);
 void md_bitmap_cond_end_sync(struct bitmap *bitmap, sector_t sector, bool force);
 void md_bitmap_sync_with_cluster(struct mddev *mddev,
diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index 3e50f85852d0..dd7e3011a6e6 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -2039,7 +2039,7 @@ static void abort_sync_write(struct mddev *mddev, struct r1bio *r1_bio)
 
 	/* make sure these bits don't get cleared. */
 	do {
-		md_bitmap_end_sync(mddev->bitmap, s, &sync_blocks, 1);
+		md_bitmap_end_sync(mddev->bitmap, s, &sync_blocks);
 		s += sync_blocks;
 		sectors_to_go -= sync_blocks;
 	} while (sectors_to_go > 0);
@@ -2786,7 +2786,7 @@ static sector_t raid1_sync_request(struct mddev *mddev, sector_t sector_nr,
 		 */
 		if (mddev->curr_resync < max_sector) /* aborted */
 			md_bitmap_end_sync(mddev->bitmap, mddev->curr_resync,
-					   &sync_blocks, 1);
+					   &sync_blocks);
 		else /* completed sync */
 			conf->fullsync = 0;
 
diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index d88878741ed4..33372d30fa99 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -3195,12 +3195,12 @@ static sector_t raid10_sync_request(struct mddev *mddev, sector_t sector_nr,
 		if (mddev->curr_resync < max_sector) { /* aborted */
 			if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
 				md_bitmap_end_sync(mddev->bitmap, mddev->curr_resync,
-						   &sync_blocks, 1);
+						   &sync_blocks);
 			else for (i = 0; i < conf->geo.raid_disks; i++) {
 				sector_t sect =
 					raid10_find_virt(conf, mddev->curr_resync, i);
 				md_bitmap_end_sync(mddev->bitmap, sect,
-						   &sync_blocks, 1);
+						   &sync_blocks);
 			}
 		} else {
 			/* completed sync */
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 313904dd6555..3e9fed1e1153 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -6498,7 +6498,7 @@ static inline sector_t raid5_sync_request(struct mddev *mddev, sector_t sector_n
 
 		if (mddev->curr_resync < max_sector) /* aborted */
 			md_bitmap_end_sync(mddev->bitmap, mddev->curr_resync,
-					   &sync_blocks, 1);
+					   &sync_blocks);
 		else /* completed sync */
 			conf->fullsync = 0;
 		md_bitmap_close_sync(mddev->bitmap);
-- 
2.39.2

[PATCH md-6.12 26/41] md/md-bitmap: merge md_bitmap_end_sync() into bitmap_operations

[Yu Kuai]

From: Yu Kuai <yukuai3@huawei.com>

So that the implementation won't be exposed, and it'll be possible
to invent a new bitmap by replacing bitmap_operations.

Also change the parameter from bitmap to mddev, to avoid access
bitmap outside md-bitmap.c as much as possible.

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
---
 drivers/md/md-bitmap.c |  8 ++++----
 drivers/md/md-bitmap.h |  3 +--
 drivers/md/raid1.c     |  6 +++---
 drivers/md/raid10.c    | 10 ++++++----
 drivers/md/raid5.c     |  4 ++--
 5 files changed, 16 insertions(+), 15 deletions(-)

diff --git a/drivers/md/md-bitmap.c b/drivers/md/md-bitmap.c
index de837ce20f9e..c03e94416191 100644
--- a/drivers/md/md-bitmap.c
+++ b/drivers/md/md-bitmap.c
@@ -1665,12 +1665,11 @@ static void __bitmap_end_sync(struct bitmap *bitmap, sector_t offset,
 	spin_unlock_irqrestore(&bitmap->counts.lock, flags);
 }
 
-void md_bitmap_end_sync(struct bitmap *bitmap, sector_t offset,
-			sector_t *blocks)
+static void bitmap_end_sync(struct mddev *mddev, sector_t offset,
+			    sector_t *blocks)
 {
-	__bitmap_end_sync(bitmap, offset, blocks, true);
+	__bitmap_end_sync(mddev->bitmap, offset, blocks, true);
 }
-EXPORT_SYMBOL(md_bitmap_end_sync);
 
 void md_bitmap_close_sync(struct bitmap *bitmap)
 {
@@ -2745,6 +2744,7 @@ static struct bitmap_operations bitmap_ops = {
 	.startwrite		= bitmap_startwrite,
 	.endwrite		= bitmap_endwrite,
 	.start_sync		= bitmap_start_sync,
+	.end_sync		= bitmap_end_sync,
 
 	.update_sb		= bitmap_update_sb,
 	.get_stats		= bitmap_get_stats,
diff --git a/drivers/md/md-bitmap.h b/drivers/md/md-bitmap.h
index 6691524bdc80..d6f2d5979da4 100644
--- a/drivers/md/md-bitmap.h
+++ b/drivers/md/md-bitmap.h
@@ -261,6 +261,7 @@ struct bitmap_operations {
 			 unsigned long sectors, bool success, bool behind);
 	bool (*start_sync)(struct mddev *mddev, sector_t offset,
 			   sector_t *blocks, bool degraded);
+	void (*end_sync)(struct mddev *mddev, sector_t offset, sector_t *blocks);
 
 	void (*update_sb)(struct bitmap *bitmap);
 	int (*get_stats)(struct bitmap *bitmap, struct md_bitmap_stats *stats);
@@ -270,8 +271,6 @@ struct bitmap_operations {
 void mddev_set_bitmap_ops(struct mddev *mddev);
 
 /* these are exported */
-void md_bitmap_end_sync(struct bitmap *bitmap, sector_t offset,
-			sector_t *blocks);
 void md_bitmap_close_sync(struct bitmap *bitmap);
 void md_bitmap_cond_end_sync(struct bitmap *bitmap, sector_t sector, bool force);
 void md_bitmap_sync_with_cluster(struct mddev *mddev,
diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index dd7e3011a6e6..e5942f0d6fd2 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -2039,7 +2039,7 @@ static void abort_sync_write(struct mddev *mddev, struct r1bio *r1_bio)
 
 	/* make sure these bits don't get cleared. */
 	do {
-		md_bitmap_end_sync(mddev->bitmap, s, &sync_blocks);
+		mddev->bitmap_ops->end_sync(mddev, s, &sync_blocks);
 		s += sync_blocks;
 		sectors_to_go -= sync_blocks;
 	} while (sectors_to_go > 0);
@@ -2785,8 +2785,8 @@ static sector_t raid1_sync_request(struct mddev *mddev, sector_t sector_nr,
 		 * We can find the current addess in mddev->curr_resync
 		 */
 		if (mddev->curr_resync < max_sector) /* aborted */
-			md_bitmap_end_sync(mddev->bitmap, mddev->curr_resync,
-					   &sync_blocks);
+			mddev->bitmap_ops->end_sync(mddev, mddev->curr_resync,
+						    &sync_blocks);
 		else /* completed sync */
 			conf->fullsync = 0;
 
diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 33372d30fa99..15299a7774a0 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -3194,13 +3194,15 @@ static sector_t raid10_sync_request(struct mddev *mddev, sector_t sector_nr,
 
 		if (mddev->curr_resync < max_sector) { /* aborted */
 			if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
-				md_bitmap_end_sync(mddev->bitmap, mddev->curr_resync,
-						   &sync_blocks);
+				mddev->bitmap_ops->end_sync(mddev,
+							    mddev->curr_resync,
+							    &sync_blocks);
 			else for (i = 0; i < conf->geo.raid_disks; i++) {
 				sector_t sect =
 					raid10_find_virt(conf, mddev->curr_resync, i);
-				md_bitmap_end_sync(mddev->bitmap, sect,
-						   &sync_blocks);
+
+				mddev->bitmap_ops->end_sync(mddev, sect,
+							    &sync_blocks);
 			}
 		} else {
 			/* completed sync */
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 3e9fed1e1153..89ae149bf28e 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -6497,8 +6497,8 @@ static inline sector_t raid5_sync_request(struct mddev *mddev, sector_t sector_n
 		}
 
 		if (mddev->curr_resync < max_sector) /* aborted */
-			md_bitmap_end_sync(mddev->bitmap, mddev->curr_resync,
-					   &sync_blocks);
+			mddev->bitmap_ops->end_sync(mddev, mddev->curr_resync,
+						    &sync_blocks);
 		else /* completed sync */
 			conf->fullsync = 0;
 		md_bitmap_close_sync(mddev->bitmap);
-- 
2.39.2

[PATCH md-6.12 27/41] md/md-bitmap: merge md_bitmap_close_sync() into bitmap_operations

[Yu Kuai]

From: Yu Kuai <yukuai3@huawei.com>

So that the implementation won't be exposed, and it'll be possible
to invent a new bitmap by replacing bitmap_operations.

Also change the parameter from bitmap to mddev, to avoid access
bitmap outside md-bitmap.c as much as possible.

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
---
 drivers/md/md-bitmap.c | 9 ++++++---
 drivers/md/md-bitmap.h | 2 +-
 drivers/md/raid1.c     | 2 +-
 drivers/md/raid10.c    | 2 +-
 drivers/md/raid5.c     | 2 +-
 5 files changed, 10 insertions(+), 7 deletions(-)

diff --git a/drivers/md/md-bitmap.c b/drivers/md/md-bitmap.c
index c03e94416191..b1f74bea8389 100644
--- a/drivers/md/md-bitmap.c
+++ b/drivers/md/md-bitmap.c
@@ -1671,7 +1671,7 @@ static void bitmap_end_sync(struct mddev *mddev, sector_t offset,
 	__bitmap_end_sync(mddev->bitmap, offset, blocks, true);
 }
 
-void md_bitmap_close_sync(struct bitmap *bitmap)
+static void bitmap_close_sync(struct mddev *mddev)
 {
 	/* Sync has finished, and any bitmap chunks that weren't synced
 	 * properly have been aborted.  It remains to us to clear the
@@ -1679,14 +1679,16 @@ void md_bitmap_close_sync(struct bitmap *bitmap)
 	 */
 	sector_t sector = 0;
 	sector_t blocks;
+	struct bitmap *bitmap = mddev->bitmap;
+
 	if (!bitmap)
 		return;
+
 	while (sector < bitmap->mddev->resync_max_sectors) {
 		__bitmap_end_sync(bitmap, sector, &blocks, false);
 		sector += blocks;
 	}
 }
-EXPORT_SYMBOL(md_bitmap_close_sync);
 
 void md_bitmap_cond_end_sync(struct bitmap *bitmap, sector_t sector, bool force)
 {
@@ -2017,7 +2019,7 @@ static int bitmap_load(struct mddev *mddev)
 		bitmap_start_sync(mddev, sector, &blocks, false);
 		sector += blocks;
 	}
-	md_bitmap_close_sync(bitmap);
+	bitmap_close_sync(mddev);
 
 	if (mddev->degraded == 0
 	    || bitmap->events_cleared == mddev->events)
@@ -2745,6 +2747,7 @@ static struct bitmap_operations bitmap_ops = {
 	.endwrite		= bitmap_endwrite,
 	.start_sync		= bitmap_start_sync,
 	.end_sync		= bitmap_end_sync,
+	.close_sync		= bitmap_close_sync,
 
 	.update_sb		= bitmap_update_sb,
 	.get_stats		= bitmap_get_stats,
diff --git a/drivers/md/md-bitmap.h b/drivers/md/md-bitmap.h
index d6f2d5979da4..5d919b530317 100644
--- a/drivers/md/md-bitmap.h
+++ b/drivers/md/md-bitmap.h
@@ -262,6 +262,7 @@ struct bitmap_operations {
 	bool (*start_sync)(struct mddev *mddev, sector_t offset,
 			   sector_t *blocks, bool degraded);
 	void (*end_sync)(struct mddev *mddev, sector_t offset, sector_t *blocks);
+	void (*close_sync)(struct mddev *mddev);
 
 	void (*update_sb)(struct bitmap *bitmap);
 	int (*get_stats)(struct bitmap *bitmap, struct md_bitmap_stats *stats);
@@ -271,7 +272,6 @@ struct bitmap_operations {
 void mddev_set_bitmap_ops(struct mddev *mddev);
 
 /* these are exported */
-void md_bitmap_close_sync(struct bitmap *bitmap);
 void md_bitmap_cond_end_sync(struct bitmap *bitmap, sector_t sector, bool force);
 void md_bitmap_sync_with_cluster(struct mddev *mddev,
 				 sector_t old_lo, sector_t old_hi,
diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index e5942f0d6fd2..52ca5619d9b4 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -2790,7 +2790,7 @@ static sector_t raid1_sync_request(struct mddev *mddev, sector_t sector_nr,
 		else /* completed sync */
 			conf->fullsync = 0;
 
-		md_bitmap_close_sync(mddev->bitmap);
+		mddev->bitmap_ops->close_sync(mddev);
 		close_sync(conf);
 
 		if (mddev_is_clustered(mddev)) {
diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 15299a7774a0..5b1c86c368b1 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -3222,7 +3222,7 @@ static sector_t raid10_sync_request(struct mddev *mddev, sector_t sector_nr,
 			}
 			conf->fullsync = 0;
 		}
-		md_bitmap_close_sync(mddev->bitmap);
+		mddev->bitmap_ops->close_sync(mddev);
 		close_sync(conf);
 		*skipped = 1;
 		return sectors_skipped;
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 89ae149bf28e..d2b8d2517abf 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -6501,7 +6501,7 @@ static inline sector_t raid5_sync_request(struct mddev *mddev, sector_t sector_n
 						    &sync_blocks);
 		else /* completed sync */
 			conf->fullsync = 0;
-		md_bitmap_close_sync(mddev->bitmap);
+		mddev->bitmap_ops->close_sync(mddev);
 
 		return 0;
 	}
-- 
2.39.2

[PATCH md-6.12 28/41] md/md-bitmap: mrege md_bitmap_cond_end_sync() into bitmap_operations

[Yu Kuai]

From: Yu Kuai <yukuai3@huawei.com>

So that the implementation won't be exposed, and it'll be possible
to invent a new bitmap by replacing bitmap_operations.

Also change the parameter from bitmap to mddev, to avoid access
bitmap outside md-bitmap.c as much as possible.

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
---
 drivers/md/md-bitmap.c | 6 ++++--
 drivers/md/md-bitmap.h | 2 +-
 drivers/md/raid1.c     | 6 +++---
 drivers/md/raid10.c    | 2 +-
 drivers/md/raid5.c     | 2 +-
 5 files changed, 10 insertions(+), 8 deletions(-)

diff --git a/drivers/md/md-bitmap.c b/drivers/md/md-bitmap.c
index b1f74bea8389..729cc7e2bb59 100644
--- a/drivers/md/md-bitmap.c
+++ b/drivers/md/md-bitmap.c
@@ -1690,10 +1690,12 @@ static void bitmap_close_sync(struct mddev *mddev)
 	}
 }
 
-void md_bitmap_cond_end_sync(struct bitmap *bitmap, sector_t sector, bool force)
+static void bitmap_cond_end_sync(struct mddev *mddev, sector_t sector,
+				 bool force)
 {
 	sector_t s = 0;
 	sector_t blocks;
+	struct bitmap *bitmap = mddev->bitmap;
 
 	if (!bitmap)
 		return;
@@ -1718,7 +1720,6 @@ void md_bitmap_cond_end_sync(struct bitmap *bitmap, sector_t sector, bool force)
 	bitmap->last_end_sync = jiffies;
 	sysfs_notify_dirent_safe(bitmap->mddev->sysfs_completed);
 }
-EXPORT_SYMBOL(md_bitmap_cond_end_sync);
 
 void md_bitmap_sync_with_cluster(struct mddev *mddev,
 			      sector_t old_lo, sector_t old_hi,
@@ -2747,6 +2748,7 @@ static struct bitmap_operations bitmap_ops = {
 	.endwrite		= bitmap_endwrite,
 	.start_sync		= bitmap_start_sync,
 	.end_sync		= bitmap_end_sync,
+	.cond_end_sync		= bitmap_cond_end_sync,
 	.close_sync		= bitmap_close_sync,
 
 	.update_sb		= bitmap_update_sb,
diff --git a/drivers/md/md-bitmap.h b/drivers/md/md-bitmap.h
index 5d919b530317..027de097f96a 100644
--- a/drivers/md/md-bitmap.h
+++ b/drivers/md/md-bitmap.h
@@ -262,6 +262,7 @@ struct bitmap_operations {
 	bool (*start_sync)(struct mddev *mddev, sector_t offset,
 			   sector_t *blocks, bool degraded);
 	void (*end_sync)(struct mddev *mddev, sector_t offset, sector_t *blocks);
+	void (*cond_end_sync)(struct mddev *mddev, sector_t sector, bool force);
 	void (*close_sync)(struct mddev *mddev);
 
 	void (*update_sb)(struct bitmap *bitmap);
@@ -272,7 +273,6 @@ struct bitmap_operations {
 void mddev_set_bitmap_ops(struct mddev *mddev);
 
 /* these are exported */
-void md_bitmap_cond_end_sync(struct bitmap *bitmap, sector_t sector, bool force);
 void md_bitmap_sync_with_cluster(struct mddev *mddev,
 				 sector_t old_lo, sector_t old_hi,
 				 sector_t new_lo, sector_t new_hi);
diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index 52ca5619d9b4..00174cacb1f4 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -2828,9 +2828,9 @@ static sector_t raid1_sync_request(struct mddev *mddev, sector_t sector_nr,
 	 * sector_nr + two times RESYNC_SECTORS
 	 */
 
-	md_bitmap_cond_end_sync(mddev->bitmap, sector_nr,
-		mddev_is_clustered(mddev) && (sector_nr + 2 * RESYNC_SECTORS > conf->cluster_sync_high));
-
+	mddev->bitmap_ops->cond_end_sync(mddev, sector_nr,
+		mddev_is_clustered(mddev) &&
+		(sector_nr + 2 * RESYNC_SECTORS > conf->cluster_sync_high));
 
 	if (raise_barrier(conf, sector_nr))
 		return 0;
diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 5b1c86c368b1..5a7b19f48c45 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -3543,7 +3543,7 @@ static sector_t raid10_sync_request(struct mddev *mddev, sector_t sector_nr,
 		 * safety reason, which ensures curr_resync_completed is
 		 * updated in bitmap_cond_end_sync.
 		 */
-		md_bitmap_cond_end_sync(mddev->bitmap, sector_nr,
+		mddev->bitmap_ops->cond_end_sync(mddev, sector_nr,
 					mddev_is_clustered(mddev) &&
 					(sector_nr + 2 * RESYNC_SECTORS > conf->cluster_sync_high));
 
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index d2b8d2517abf..87b8d19ab601 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -6540,7 +6540,7 @@ static inline sector_t raid5_sync_request(struct mddev *mddev, sector_t sector_n
 		return sync_blocks * RAID5_STRIPE_SECTORS(conf);
 	}
 
-	md_bitmap_cond_end_sync(mddev->bitmap, sector_nr, false);
+	mddev->bitmap_ops->cond_end_sync(mddev, sector_nr, false);
 
 	sh = raid5_get_active_stripe(conf, NULL, sector_nr,
 				     R5_GAS_NOBLOCK);
-- 
2.39.2

[PATCH md-6.12 29/41] md/md-bitmap: merge md_bitmap_sync_with_cluster() into bitmap_operations

[Yu Kuai]

From: Yu Kuai <yukuai3@huawei.com>

So that the implementation won't be exposed, and it'll be possible
to invent a new bitmap by replacing bitmap_operations.

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
---
 drivers/md/md-bitmap.c  | 9 +++++----
 drivers/md/md-bitmap.h  | 8 ++++----
 drivers/md/md-cluster.c | 4 ++--
 3 files changed, 11 insertions(+), 10 deletions(-)

diff --git a/drivers/md/md-bitmap.c b/drivers/md/md-bitmap.c
index 729cc7e2bb59..ebf80580ffc9 100644
--- a/drivers/md/md-bitmap.c
+++ b/drivers/md/md-bitmap.c
@@ -1721,9 +1721,9 @@ static void bitmap_cond_end_sync(struct mddev *mddev, sector_t sector,
 	sysfs_notify_dirent_safe(bitmap->mddev->sysfs_completed);
 }
 
-void md_bitmap_sync_with_cluster(struct mddev *mddev,
-			      sector_t old_lo, sector_t old_hi,
-			      sector_t new_lo, sector_t new_hi)
+static void bitmap_sync_with_cluster(struct mddev *mddev,
+				     sector_t old_lo, sector_t old_hi,
+				     sector_t new_lo, sector_t new_hi)
 {
 	struct bitmap *bitmap = mddev->bitmap;
 	sector_t sector, blocks = 0;
@@ -1740,7 +1740,6 @@ void md_bitmap_sync_with_cluster(struct mddev *mddev,
 	}
 	WARN((blocks > new_hi) && old_hi, "alignment is not correct for hi\n");
 }
-EXPORT_SYMBOL(md_bitmap_sync_with_cluster);
 
 static void md_bitmap_set_memory_bits(struct bitmap *bitmap, sector_t offset, int needed)
 {
@@ -2753,6 +2752,8 @@ static struct bitmap_operations bitmap_ops = {
 
 	.update_sb		= bitmap_update_sb,
 	.get_stats		= bitmap_get_stats,
+
+	.sync_with_cluster	= bitmap_sync_with_cluster,
 };
 
 void mddev_set_bitmap_ops(struct mddev *mddev)
diff --git a/drivers/md/md-bitmap.h b/drivers/md/md-bitmap.h
index 027de097f96a..0953ac73735c 100644
--- a/drivers/md/md-bitmap.h
+++ b/drivers/md/md-bitmap.h
@@ -267,16 +267,16 @@ struct bitmap_operations {
 
 	void (*update_sb)(struct bitmap *bitmap);
 	int (*get_stats)(struct bitmap *bitmap, struct md_bitmap_stats *stats);
+
+	void (*sync_with_cluster)(struct mddev *mddev,
+				  sector_t old_lo, sector_t old_hi,
+				  sector_t new_lo, sector_t new_hi);
 };
 
 /* the bitmap API */
 void mddev_set_bitmap_ops(struct mddev *mddev);
 
 /* these are exported */
-void md_bitmap_sync_with_cluster(struct mddev *mddev,
-				 sector_t old_lo, sector_t old_hi,
-				 sector_t new_lo, sector_t new_hi);
-
 void md_bitmap_unplug(struct bitmap *bitmap);
 void md_bitmap_unplug_async(struct bitmap *bitmap);
 void md_bitmap_daemon_work(struct mddev *mddev);
diff --git a/drivers/md/md-cluster.c b/drivers/md/md-cluster.c
index a5f1135cc1fa..55feabe14ad3 100644
--- a/drivers/md/md-cluster.c
+++ b/drivers/md/md-cluster.c
@@ -497,8 +497,8 @@ static void process_suspend_info(struct mddev *mddev,
 	 * we don't want to trigger lots of WARN.
 	 */
 	if (sb && !(le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE))
-		md_bitmap_sync_with_cluster(mddev, cinfo->sync_low,
-					    cinfo->sync_hi, lo, hi);
+		mddev->bitmap_ops->sync_with_cluster(mddev, cinfo->sync_low,
+						     cinfo->sync_hi, lo, hi);
 	cinfo->sync_low = lo;
 	cinfo->sync_hi = hi;
 
-- 
2.39.2

[PATCH md-6.12 30/41] md/md-bitmap: merge md_bitmap_unplug_async() into md_bitmap_unplug()

[Yu Kuai]

From: Yu Kuai <yukuai3@huawei.com>

Add a parameter 'bool sync' to distinguish them, and
md_bitmap_unplug_async() won't be exported anymore, hence
bitmap_operations only need one op to cover them.

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
---
 drivers/md/md-bitmap.c | 28 ++++++++++++++++++++--------
 drivers/md/md-bitmap.h |  3 +--
 drivers/md/md.c        |  2 +-
 drivers/md/raid1-10.c  |  7 ++-----
 drivers/md/raid1.c     |  2 +-
 drivers/md/raid10.c    |  4 ++--
 drivers/md/raid5.c     |  2 +-
 7 files changed, 28 insertions(+), 20 deletions(-)

diff --git a/drivers/md/md-bitmap.c b/drivers/md/md-bitmap.c
index ebf80580ffc9..8c83891fefad 100644
--- a/drivers/md/md-bitmap.c
+++ b/drivers/md/md-bitmap.c
@@ -1026,7 +1026,7 @@ static int md_bitmap_file_test_bit(struct bitmap *bitmap, sector_t block)
 /* this gets called when the md device is ready to unplug its underlying
  * (slave) device queues -- before we let any writes go down, we need to
  * sync the dirty pages of the bitmap file to disk */
-void md_bitmap_unplug(struct bitmap *bitmap)
+static void __bitmap_unplug(struct bitmap *bitmap)
 {
 	unsigned long i;
 	int dirty, need_write;
@@ -1058,7 +1058,6 @@ void md_bitmap_unplug(struct bitmap *bitmap)
 	if (test_bit(BITMAP_WRITE_ERROR, &bitmap->flags))
 		md_bitmap_file_kick(bitmap);
 }
-EXPORT_SYMBOL(md_bitmap_unplug);
 
 struct bitmap_unplug_work {
 	struct work_struct work;
@@ -1071,11 +1070,11 @@ static void md_bitmap_unplug_fn(struct work_struct *work)
 	struct bitmap_unplug_work *unplug_work =
 		container_of(work, struct bitmap_unplug_work, work);
 
-	md_bitmap_unplug(unplug_work->bitmap);
+	__bitmap_unplug(unplug_work->bitmap);
 	complete(unplug_work->done);
 }
 
-void md_bitmap_unplug_async(struct bitmap *bitmap)
+static void bitmap_unplug_async(struct bitmap *bitmap)
 {
 	DECLARE_COMPLETION_ONSTACK(done);
 	struct bitmap_unplug_work unplug_work;
@@ -1087,7 +1086,20 @@ void md_bitmap_unplug_async(struct bitmap *bitmap)
 	queue_work(md_bitmap_wq, &unplug_work.work);
 	wait_for_completion(&done);
 }
-EXPORT_SYMBOL(md_bitmap_unplug_async);
+
+void md_bitmap_unplug(struct mddev *mddev, bool sync)
+{
+	struct bitmap *bitmap = mddev->bitmap;
+
+	if (!bitmap)
+		return;
+
+	if (sync)
+		__bitmap_unplug(bitmap);
+	else
+		bitmap_unplug_async(bitmap);
+}
+EXPORT_SYMBOL_GPL(md_bitmap_unplug);
 
 static void md_bitmap_set_memory_bits(struct bitmap *bitmap, sector_t offset, int needed);
 
@@ -2108,9 +2120,9 @@ int md_bitmap_copy_from_slot(struct mddev *mddev, int slot,
 		for (i = 0; i < bitmap->storage.file_pages; i++)
 			if (test_page_attr(bitmap, i, BITMAP_PAGE_PENDING))
 				set_page_attr(bitmap, i, BITMAP_PAGE_NEEDWRITE);
-		md_bitmap_unplug(bitmap);
+		__bitmap_unplug(bitmap);
 	}
-	md_bitmap_unplug(mddev->bitmap);
+	__bitmap_unplug(mddev->bitmap);
 	*low = lo;
 	*high = hi;
 	md_bitmap_free(bitmap);
@@ -2351,7 +2363,7 @@ int md_bitmap_resize(struct bitmap *bitmap, sector_t blocks,
 	spin_unlock_irq(&bitmap->counts.lock);
 
 	if (!init) {
-		md_bitmap_unplug(bitmap);
+		__bitmap_unplug(bitmap);
 		bitmap->mddev->pers->quiesce(bitmap->mddev, 0);
 	}
 	ret = 0;
diff --git a/drivers/md/md-bitmap.h b/drivers/md/md-bitmap.h
index 0953ac73735c..ba8ba7e49ef9 100644
--- a/drivers/md/md-bitmap.h
+++ b/drivers/md/md-bitmap.h
@@ -277,8 +277,7 @@ struct bitmap_operations {
 void mddev_set_bitmap_ops(struct mddev *mddev);
 
 /* these are exported */
-void md_bitmap_unplug(struct bitmap *bitmap);
-void md_bitmap_unplug_async(struct bitmap *bitmap);
+void md_bitmap_unplug(struct mddev *mddev, bool sync);
 void md_bitmap_daemon_work(struct mddev *mddev);
 
 int md_bitmap_resize(struct bitmap *bitmap, sector_t blocks,
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 6cf0131b9b81..8e3f753ee035 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -4715,7 +4715,7 @@ bitmap_store(struct mddev *mddev, const char *buf, size_t len)
 		mddev->bitmap_ops->dirty_bits(mddev, chunk, end_chunk);
 		buf = skip_spaces(end);
 	}
-	md_bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
+	md_bitmap_unplug(mddev, true); /* flush the bits to disk */
 out:
 	mddev_unlock(mddev);
 	return len;
diff --git a/drivers/md/raid1-10.c b/drivers/md/raid1-10.c
index 2ea1710a3b70..45b30f08f3a5 100644
--- a/drivers/md/raid1-10.c
+++ b/drivers/md/raid1-10.c
@@ -166,12 +166,9 @@ static inline bool raid1_add_bio_to_plug(struct mddev *mddev, struct bio *bio,
  * while current io submission must wait for bitmap io to be done. In order to
  * avoid such deadlock, submit bitmap io asynchronously.
  */
-static inline void raid1_prepare_flush_writes(struct bitmap *bitmap)
+static inline void raid1_prepare_flush_writes(struct mddev *mddev)
 {
-	if (current->bio_list)
-		md_bitmap_unplug_async(bitmap);
-	else
-		md_bitmap_unplug(bitmap);
+	md_bitmap_unplug(mddev, current->bio_list == NULL);
 }
 
 /*
diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index 00174cacb1f4..fe893bdd2c0a 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -896,7 +896,7 @@ static void wake_up_barrier(struct r1conf *conf)
 static void flush_bio_list(struct r1conf *conf, struct bio *bio)
 {
 	/* flush any pending bitmap writes to disk before proceeding w/ I/O */
-	raid1_prepare_flush_writes(conf->mddev->bitmap);
+	raid1_prepare_flush_writes(conf->mddev);
 	wake_up_barrier(conf);
 
 	while (bio) { /* submit pending writes */
diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 5a7b19f48c45..c79f374668dd 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -885,7 +885,7 @@ static void flush_pending_writes(struct r10conf *conf)
 		__set_current_state(TASK_RUNNING);
 
 		blk_start_plug(&plug);
-		raid1_prepare_flush_writes(conf->mddev->bitmap);
+		raid1_prepare_flush_writes(conf->mddev);
 		wake_up(&conf->wait_barrier);
 
 		while (bio) { /* submit pending writes */
@@ -1101,7 +1101,7 @@ static void raid10_unplug(struct blk_plug_cb *cb, bool from_schedule)
 
 	/* we aren't scheduling, so we can do the write-out directly. */
 	bio = bio_list_get(&plug->pending);
-	raid1_prepare_flush_writes(mddev->bitmap);
+	raid1_prepare_flush_writes(mddev);
 	wake_up_barrier(conf);
 
 	while (bio) { /* submit pending writes */
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 87b8d19ab601..e98061c01b44 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -6768,7 +6768,7 @@ static void raid5d(struct md_thread *thread)
 			/* Now is a good time to flush some bitmap updates */
 			conf->seq_flush++;
 			spin_unlock_irq(&conf->device_lock);
-			md_bitmap_unplug(mddev->bitmap);
+			md_bitmap_unplug(mddev, true);
 			spin_lock_irq(&conf->device_lock);
 			conf->seq_write = conf->seq_flush;
 			activate_bit_delay(conf, conf->temp_inactive_list);
-- 
2.39.2

[PATCH md-6.12 31/41] md/md-bitmap: merge bitmap_unplug() into bitmap_operations

[Yu Kuai]

From: Yu Kuai <yukuai3@huawei.com>

So that the implementation won't be exposed, and it'll be possible
to invent a new bitmap by replacing bitmap_operations.

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
---
 drivers/md/md-bitmap.c | 4 ++--
 drivers/md/md-bitmap.h | 2 +-
 drivers/md/md.c        | 2 +-
 drivers/md/raid1-10.c  | 2 +-
 drivers/md/raid5.c     | 2 +-
 5 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/md/md-bitmap.c b/drivers/md/md-bitmap.c
index 8c83891fefad..5838366f47aa 100644
--- a/drivers/md/md-bitmap.c
+++ b/drivers/md/md-bitmap.c
@@ -1087,7 +1087,7 @@ static void bitmap_unplug_async(struct bitmap *bitmap)
 	wait_for_completion(&done);
 }
 
-void md_bitmap_unplug(struct mddev *mddev, bool sync)
+static void bitmap_unplug(struct mddev *mddev, bool sync)
 {
 	struct bitmap *bitmap = mddev->bitmap;
 
@@ -1099,7 +1099,6 @@ void md_bitmap_unplug(struct mddev *mddev, bool sync)
 	else
 		bitmap_unplug_async(bitmap);
 }
-EXPORT_SYMBOL_GPL(md_bitmap_unplug);
 
 static void md_bitmap_set_memory_bits(struct bitmap *bitmap, sector_t offset, int needed);
 
@@ -2754,6 +2753,7 @@ static struct bitmap_operations bitmap_ops = {
 	.flush			= bitmap_flush,
 	.write_all		= bitmap_write_all,
 	.dirty_bits		= bitmap_dirty_bits,
+	.unplug			= bitmap_unplug,
 
 	.startwrite		= bitmap_startwrite,
 	.endwrite		= bitmap_endwrite,
diff --git a/drivers/md/md-bitmap.h b/drivers/md/md-bitmap.h
index ba8ba7e49ef9..dbe9b27091f4 100644
--- a/drivers/md/md-bitmap.h
+++ b/drivers/md/md-bitmap.h
@@ -254,6 +254,7 @@ struct bitmap_operations {
 	void (*write_all)(struct mddev *mddev);
 	void (*dirty_bits)(struct mddev *mddev, unsigned long s,
 			   unsigned long e);
+	void (*unplug)(struct mddev *mddev, bool sync);
 
 	int (*startwrite)(struct mddev *mddev, sector_t offset,
 			  unsigned long sectors, bool behind);
@@ -277,7 +278,6 @@ struct bitmap_operations {
 void mddev_set_bitmap_ops(struct mddev *mddev);
 
 /* these are exported */
-void md_bitmap_unplug(struct mddev *mddev, bool sync);
 void md_bitmap_daemon_work(struct mddev *mddev);
 
 int md_bitmap_resize(struct bitmap *bitmap, sector_t blocks,
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 8e3f753ee035..6f68f8da0848 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -4715,7 +4715,7 @@ bitmap_store(struct mddev *mddev, const char *buf, size_t len)
 		mddev->bitmap_ops->dirty_bits(mddev, chunk, end_chunk);
 		buf = skip_spaces(end);
 	}
-	md_bitmap_unplug(mddev, true); /* flush the bits to disk */
+	mddev->bitmap_ops->unplug(mddev, true); /* flush the bits to disk */
 out:
 	mddev_unlock(mddev);
 	return len;
diff --git a/drivers/md/raid1-10.c b/drivers/md/raid1-10.c
index 45b30f08f3a5..e8207513eb1b 100644
--- a/drivers/md/raid1-10.c
+++ b/drivers/md/raid1-10.c
@@ -168,7 +168,7 @@ static inline bool raid1_add_bio_to_plug(struct mddev *mddev, struct bio *bio,
  */
 static inline void raid1_prepare_flush_writes(struct mddev *mddev)
 {
-	md_bitmap_unplug(mddev, current->bio_list == NULL);
+	mddev->bitmap_ops->unplug(mddev, current->bio_list == NULL);
 }
 
 /*
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index e98061c01b44..91b610d11c6a 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -6768,7 +6768,7 @@ static void raid5d(struct md_thread *thread)
 			/* Now is a good time to flush some bitmap updates */
 			conf->seq_flush++;
 			spin_unlock_irq(&conf->device_lock);
-			md_bitmap_unplug(mddev, true);
+			mddev->bitmap_ops->unplug(mddev, true);
 			spin_lock_irq(&conf->device_lock);
 			conf->seq_write = conf->seq_flush;
 			activate_bit_delay(conf, conf->temp_inactive_list);
-- 
2.39.2

[PATCH md-6.12 32/41] md/md-bitmap: merge md_bitmap_daemon_work() into bitmap_operations

[Yu Kuai]

From: Yu Kuai <yukuai3@huawei.com>

So that the implementation won't be exposed, and it'll be possible
to invent a new bitmap by replacing bitmap_operations.

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
---
 drivers/md/md-bitmap.c | 9 +++++----
 drivers/md/md-bitmap.h | 2 +-
 drivers/md/md.c        | 2 +-
 3 files changed, 7 insertions(+), 6 deletions(-)

diff --git a/drivers/md/md-bitmap.c b/drivers/md/md-bitmap.c
index 5838366f47aa..51c43dced1e8 100644
--- a/drivers/md/md-bitmap.c
+++ b/drivers/md/md-bitmap.c
@@ -1298,7 +1298,7 @@ static void mddev_set_timeout(struct mddev *mddev, unsigned long timeout,
  * bitmap daemon -- periodically wakes up to clean bits and flush pages
  *			out to disk
  */
-void md_bitmap_daemon_work(struct mddev *mddev)
+static void bitmap_daemon_work(struct mddev *mddev)
 {
 	struct bitmap *bitmap;
 	unsigned long j;
@@ -1815,11 +1815,11 @@ static void bitmap_flush(struct mddev *mddev)
 	 */
 	sleep = mddev->bitmap_info.daemon_sleep * 2;
 	bitmap->daemon_lastrun -= sleep;
-	md_bitmap_daemon_work(mddev);
+	bitmap_daemon_work(mddev);
 	bitmap->daemon_lastrun -= sleep;
-	md_bitmap_daemon_work(mddev);
+	bitmap_daemon_work(mddev);
 	bitmap->daemon_lastrun -= sleep;
-	md_bitmap_daemon_work(mddev);
+	bitmap_daemon_work(mddev);
 	if (mddev->bitmap_info.external)
 		md_super_wait(mddev);
 	bitmap_update_sb(bitmap);
@@ -2754,6 +2754,7 @@ static struct bitmap_operations bitmap_ops = {
 	.write_all		= bitmap_write_all,
 	.dirty_bits		= bitmap_dirty_bits,
 	.unplug			= bitmap_unplug,
+	.daemon_work		= bitmap_daemon_work,
 
 	.startwrite		= bitmap_startwrite,
 	.endwrite		= bitmap_endwrite,
diff --git a/drivers/md/md-bitmap.h b/drivers/md/md-bitmap.h
index dbe9b27091f4..065b36c0c43a 100644
--- a/drivers/md/md-bitmap.h
+++ b/drivers/md/md-bitmap.h
@@ -255,6 +255,7 @@ struct bitmap_operations {
 	void (*dirty_bits)(struct mddev *mddev, unsigned long s,
 			   unsigned long e);
 	void (*unplug)(struct mddev *mddev, bool sync);
+	void (*daemon_work)(struct mddev *mddev);
 
 	int (*startwrite)(struct mddev *mddev, sector_t offset,
 			  unsigned long sectors, bool behind);
@@ -278,7 +279,6 @@ struct bitmap_operations {
 void mddev_set_bitmap_ops(struct mddev *mddev);
 
 /* these are exported */
-void md_bitmap_daemon_work(struct mddev *mddev);
 
 int md_bitmap_resize(struct bitmap *bitmap, sector_t blocks,
 		     int chunksize, int init);
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 6f68f8da0848..4046df5dc33e 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -9639,7 +9639,7 @@ static void unregister_sync_thread(struct mddev *mddev)
 void md_check_recovery(struct mddev *mddev)
 {
 	if (mddev->bitmap)
-		md_bitmap_daemon_work(mddev);
+		mddev->bitmap_ops->daemon_work(mddev);
 
 	if (signal_pending(current)) {
 		if (mddev->pers->sync_request && !mddev->external) {
-- 
2.39.2

[PATCH md-6.12 33/41] md/md-bitmap: pass in mddev directly for md_bitmap_resize()

[Yu Kuai]

From: Yu Kuai <yukuai3@huawei.com>

And move the condition "if (mddev->bitmap)" into md_bitmap_resize() as
well, on the one hand make code cleaner, on the other hand try not to
access bitmap directly.

Since we are here, also change the parameter 'init' from int to bool.

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
---
 drivers/md/dm-raid.c    |  2 +-
 drivers/md/md-bitmap.c  | 10 +++++++---
 drivers/md/md-bitmap.h  |  4 ++--
 drivers/md/md-cluster.c |  4 ++--
 drivers/md/raid1.c      | 12 +++++++-----
 drivers/md/raid10.c     | 17 +++++++++--------
 drivers/md/raid5.c      | 11 ++++++-----
 7 files changed, 34 insertions(+), 26 deletions(-)

diff --git a/drivers/md/dm-raid.c b/drivers/md/dm-raid.c
index c3e201fde4c5..cc071fcd7a04 100644
--- a/drivers/md/dm-raid.c
+++ b/drivers/md/dm-raid.c
@@ -4068,7 +4068,7 @@ static int raid_preresume(struct dm_target *ti)
 	       mddev->bitmap_info.chunksize != to_bytes(rs->requested_bitmap_chunk_sectors)))) {
 		int chunksize = to_bytes(rs->requested_bitmap_chunk_sectors) ?: mddev->bitmap_info.chunksize;
 
-		r = md_bitmap_resize(mddev->bitmap, mddev->dev_sectors, chunksize, 0);
+		r = md_bitmap_resize(mddev, mddev->dev_sectors, chunksize, false);
 		if (r)
 			DMERR("Failed to resize bitmap");
 	}
diff --git a/drivers/md/md-bitmap.c b/drivers/md/md-bitmap.c
index 51c43dced1e8..4925b685c546 100644
--- a/drivers/md/md-bitmap.c
+++ b/drivers/md/md-bitmap.c
@@ -1975,7 +1975,7 @@ static struct bitmap *__bitmap_create(struct mddev *mddev, int slot)
 		goto error;
 
 	bitmap->daemon_lastrun = jiffies;
-	err = md_bitmap_resize(bitmap, blocks, mddev->bitmap_info.chunksize, 1);
+	err = md_bitmap_resize(mddev, blocks, mddev->bitmap_info.chunksize, true);
 	if (err)
 		goto error;
 
@@ -2163,8 +2163,8 @@ static int bitmap_get_stats(struct bitmap *bitmap, struct md_bitmap_stats *stats
 	return 0;
 }
 
-int md_bitmap_resize(struct bitmap *bitmap, sector_t blocks,
-		  int chunksize, int init)
+int md_bitmap_resize(struct mddev *mddev, sector_t blocks, int chunksize,
+		     bool init)
 {
 	/* If chunk_size is 0, choose an appropriate chunk size.
 	 * Then possibly allocate new storage space.
@@ -2185,6 +2185,10 @@ int md_bitmap_resize(struct bitmap *bitmap, sector_t blocks,
 	int ret = 0;
 	long pages;
 	struct bitmap_page *new_bp;
+	struct bitmap *bitmap = mddev->bitmap;
+
+	if (!bitmap)
+		return 0;
 
 	if (bitmap->storage.file && !init) {
 		pr_info("md: cannot resize file-based bitmap\n");
diff --git a/drivers/md/md-bitmap.h b/drivers/md/md-bitmap.h
index 065b36c0c43a..4610e50548eb 100644
--- a/drivers/md/md-bitmap.h
+++ b/drivers/md/md-bitmap.h
@@ -280,8 +280,8 @@ void mddev_set_bitmap_ops(struct mddev *mddev);
 
 /* these are exported */
 
-int md_bitmap_resize(struct bitmap *bitmap, sector_t blocks,
-		     int chunksize, int init);
+int md_bitmap_resize(struct mddev *mddev, sector_t blocks, int chunksize,
+		     bool init);
 struct bitmap *get_bitmap_from_slot(struct mddev *mddev, int slot);
 int md_bitmap_copy_from_slot(struct mddev *mddev, int slot,
 			     sector_t *lo, sector_t *hi, bool clear_bits);
diff --git a/drivers/md/md-cluster.c b/drivers/md/md-cluster.c
index 55feabe14ad3..a7e5ead71c2f 100644
--- a/drivers/md/md-cluster.c
+++ b/drivers/md/md-cluster.c
@@ -628,8 +628,8 @@ static int process_recvd_msg(struct mddev *mddev, struct cluster_msg *msg)
 		break;
 	case BITMAP_RESIZE:
 		if (le64_to_cpu(msg->high) != mddev->pers->size(mddev, 0, 0))
-			ret = md_bitmap_resize(mddev->bitmap,
-					    le64_to_cpu(msg->high), 0, 0);
+			ret = md_bitmap_resize(mddev, le64_to_cpu(msg->high), 0,
+					       false);
 		break;
 	default:
 		ret = -1;
diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index fe893bdd2c0a..bf20a90c1d17 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -3310,14 +3310,16 @@ static int raid1_resize(struct mddev *mddev, sector_t sectors)
 	 * worth it.
 	 */
 	sector_t newsize = raid1_size(mddev, sectors, 0);
+	int ret;
+
 	if (mddev->external_size &&
 	    mddev->array_sectors > newsize)
 		return -EINVAL;
-	if (mddev->bitmap) {
-		int ret = md_bitmap_resize(mddev->bitmap, newsize, 0, 0);
-		if (ret)
-			return ret;
-	}
+
+	ret = md_bitmap_resize(mddev, newsize, 0, false);
+	if (ret)
+		return ret;
+
 	md_set_array_sectors(mddev, newsize);
 	if (sectors > mddev->dev_sectors &&
 	    mddev->recovery_cp > mddev->dev_sectors) {
diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index c79f374668dd..4512d285b76a 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -4196,6 +4196,7 @@ static int raid10_resize(struct mddev *mddev, sector_t sectors)
 	 */
 	struct r10conf *conf = mddev->private;
 	sector_t oldsize, size;
+	int ret;
 
 	if (mddev->reshape_position != MaxSector)
 		return -EBUSY;
@@ -4208,11 +4209,11 @@ static int raid10_resize(struct mddev *mddev, sector_t sectors)
 	if (mddev->external_size &&
 	    mddev->array_sectors > size)
 		return -EINVAL;
-	if (mddev->bitmap) {
-		int ret = md_bitmap_resize(mddev->bitmap, size, 0, 0);
-		if (ret)
-			return ret;
-	}
+
+	ret = md_bitmap_resize(mddev, size, 0, false);
+	if (ret)
+		return ret;
+
 	md_set_array_sectors(mddev, size);
 	if (sectors > mddev->dev_sectors &&
 	    mddev->recovery_cp > oldsize) {
@@ -4478,7 +4479,7 @@ static int raid10_start_reshape(struct mddev *mddev)
 		newsize = raid10_size(mddev, 0, conf->geo.raid_disks);
 
 		if (!mddev_is_clustered(mddev)) {
-			ret = md_bitmap_resize(mddev->bitmap, newsize, 0, 0);
+			ret = md_bitmap_resize(mddev, newsize, 0, false);
 			if (ret)
 				goto abort;
 			else
@@ -4500,13 +4501,13 @@ static int raid10_start_reshape(struct mddev *mddev)
 			    MD_FEATURE_RESHAPE_ACTIVE)) || (oldsize == newsize))
 			goto out;
 
-		ret = md_bitmap_resize(mddev->bitmap, newsize, 0, 0);
+		ret = md_bitmap_resize(mddev, newsize, 0, false);
 		if (ret)
 			goto abort;
 
 		ret = md_cluster_ops->resize_bitmaps(mddev, newsize, oldsize);
 		if (ret) {
-			md_bitmap_resize(mddev->bitmap, oldsize, 0, 0);
+			md_bitmap_resize(mddev, oldsize, 0, false);
 			goto abort;
 		}
 	}
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 91b610d11c6a..47c89f7b1dfe 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -8313,6 +8313,7 @@ static int raid5_resize(struct mddev *mddev, sector_t sectors)
 	 */
 	sector_t newsize;
 	struct r5conf *conf = mddev->private;
+	int ret;
 
 	if (raid5_has_log(conf) || raid5_has_ppl(conf))
 		return -EINVAL;
@@ -8321,11 +8322,11 @@ static int raid5_resize(struct mddev *mddev, sector_t sectors)
 	if (mddev->external_size &&
 	    mddev->array_sectors > newsize)
 		return -EINVAL;
-	if (mddev->bitmap) {
-		int ret = md_bitmap_resize(mddev->bitmap, sectors, 0, 0);
-		if (ret)
-			return ret;
-	}
+
+	ret = md_bitmap_resize(mddev, sectors, 0, false);
+	if (ret)
+		return ret;
+
 	md_set_array_sectors(mddev, newsize);
 	if (sectors > mddev->dev_sectors &&
 	    mddev->recovery_cp > mddev->dev_sectors) {
-- 
2.39.2

[PATCH md-6.12 34/41] md/md-bitmap: merge md_bitmap_resize() into bitmap_operations

[Yu Kuai]

From: Yu Kuai <yukuai3@huawei.com>

So that the implementation won't be exposed, and it'll be possible
to invent a new bitmap by replacing bitmap_operations.

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
---
 drivers/md/dm-raid.c    |  3 ++-
 drivers/md/md-bitmap.c  | 11 +++++++----
 drivers/md/md-bitmap.h  |  5 +++--
 drivers/md/md-cluster.c |  5 +++--
 drivers/md/raid1.c      |  2 +-
 drivers/md/raid10.c     | 10 +++++-----
 drivers/md/raid5.c      |  2 +-
 7 files changed, 22 insertions(+), 16 deletions(-)

diff --git a/drivers/md/dm-raid.c b/drivers/md/dm-raid.c
index cc071fcd7a04..63682d27fc8d 100644
--- a/drivers/md/dm-raid.c
+++ b/drivers/md/dm-raid.c
@@ -4068,7 +4068,8 @@ static int raid_preresume(struct dm_target *ti)
 	       mddev->bitmap_info.chunksize != to_bytes(rs->requested_bitmap_chunk_sectors)))) {
 		int chunksize = to_bytes(rs->requested_bitmap_chunk_sectors) ?: mddev->bitmap_info.chunksize;
 
-		r = md_bitmap_resize(mddev, mddev->dev_sectors, chunksize, false);
+		r = mddev->bitmap_ops->resize(mddev, mddev->dev_sectors,
+					      chunksize, false);
 		if (r)
 			DMERR("Failed to resize bitmap");
 	}
diff --git a/drivers/md/md-bitmap.c b/drivers/md/md-bitmap.c
index 4925b685c546..160b0bd54de8 100644
--- a/drivers/md/md-bitmap.c
+++ b/drivers/md/md-bitmap.c
@@ -32,6 +32,9 @@
 #include "md.h"
 #include "md-bitmap.h"
 
+static int bitmap_resize(struct mddev *mddev, sector_t blocks, int chunksize,
+			 bool init);
+
 static inline char *bmname(struct bitmap *bitmap)
 {
 	return bitmap->mddev ? mdname(bitmap->mddev) : "mdX";
@@ -1975,7 +1978,7 @@ static struct bitmap *__bitmap_create(struct mddev *mddev, int slot)
 		goto error;
 
 	bitmap->daemon_lastrun = jiffies;
-	err = md_bitmap_resize(mddev, blocks, mddev->bitmap_info.chunksize, true);
+	err = bitmap_resize(mddev, blocks, mddev->bitmap_info.chunksize, true);
 	if (err)
 		goto error;
 
@@ -2163,8 +2166,8 @@ static int bitmap_get_stats(struct bitmap *bitmap, struct md_bitmap_stats *stats
 	return 0;
 }
 
-int md_bitmap_resize(struct mddev *mddev, sector_t blocks, int chunksize,
-		     bool init)
+static int bitmap_resize(struct mddev *mddev, sector_t blocks, int chunksize,
+			 bool init)
 {
 	/* If chunk_size is 0, choose an appropriate chunk size.
 	 * Then possibly allocate new storage space.
@@ -2373,7 +2376,6 @@ int md_bitmap_resize(struct mddev *mddev, sector_t blocks, int chunksize,
 err:
 	return ret;
 }
-EXPORT_SYMBOL_GPL(md_bitmap_resize);
 
 static ssize_t
 location_show(struct mddev *mddev, char *page)
@@ -2752,6 +2754,7 @@ const struct attribute_group md_bitmap_group = {
 
 static struct bitmap_operations bitmap_ops = {
 	.create			= bitmap_create,
+	.resize			= bitmap_resize,
 	.load			= bitmap_load,
 	.destroy		= bitmap_destroy,
 	.flush			= bitmap_flush,
diff --git a/drivers/md/md-bitmap.h b/drivers/md/md-bitmap.h
index 4610e50548eb..d05fc2f1451e 100644
--- a/drivers/md/md-bitmap.h
+++ b/drivers/md/md-bitmap.h
@@ -248,6 +248,9 @@ struct md_bitmap_stats {
 
 struct bitmap_operations {
 	int (*create)(struct mddev *mddev, int slot);
+	int (*resize)(struct mddev *mddev, sector_t blocks, int chunksize,
+		      bool init);
+
 	int (*load)(struct mddev *mddev);
 	void (*destroy)(struct mddev *mddev);
 	void (*flush)(struct mddev *mddev);
@@ -280,8 +283,6 @@ void mddev_set_bitmap_ops(struct mddev *mddev);
 
 /* these are exported */
 
-int md_bitmap_resize(struct mddev *mddev, sector_t blocks, int chunksize,
-		     bool init);
 struct bitmap *get_bitmap_from_slot(struct mddev *mddev, int slot);
 int md_bitmap_copy_from_slot(struct mddev *mddev, int slot,
 			     sector_t *lo, sector_t *hi, bool clear_bits);
diff --git a/drivers/md/md-cluster.c b/drivers/md/md-cluster.c
index a7e5ead71c2f..21cf0f38cbf8 100644
--- a/drivers/md/md-cluster.c
+++ b/drivers/md/md-cluster.c
@@ -628,8 +628,9 @@ static int process_recvd_msg(struct mddev *mddev, struct cluster_msg *msg)
 		break;
 	case BITMAP_RESIZE:
 		if (le64_to_cpu(msg->high) != mddev->pers->size(mddev, 0, 0))
-			ret = md_bitmap_resize(mddev, le64_to_cpu(msg->high), 0,
-					       false);
+			ret = mddev->bitmap_ops->resize(mddev,
+							le64_to_cpu(msg->high),
+							0, false);
 		break;
 	default:
 		ret = -1;
diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index bf20a90c1d17..c3bdc819e5e8 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -3316,7 +3316,7 @@ static int raid1_resize(struct mddev *mddev, sector_t sectors)
 	    mddev->array_sectors > newsize)
 		return -EINVAL;
 
-	ret = md_bitmap_resize(mddev, newsize, 0, false);
+	ret = mddev->bitmap_ops->resize(mddev, newsize, 0, false);
 	if (ret)
 		return ret;
 
diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 4512d285b76a..f3bf1116794a 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -4210,7 +4210,7 @@ static int raid10_resize(struct mddev *mddev, sector_t sectors)
 	    mddev->array_sectors > size)
 		return -EINVAL;
 
-	ret = md_bitmap_resize(mddev, size, 0, false);
+	ret = mddev->bitmap_ops->resize(mddev, size, 0, false);
 	if (ret)
 		return ret;
 
@@ -4479,7 +4479,7 @@ static int raid10_start_reshape(struct mddev *mddev)
 		newsize = raid10_size(mddev, 0, conf->geo.raid_disks);
 
 		if (!mddev_is_clustered(mddev)) {
-			ret = md_bitmap_resize(mddev, newsize, 0, false);
+			ret = mddev->bitmap_ops->resize(mddev, newsize, 0, false);
 			if (ret)
 				goto abort;
 			else
@@ -4494,20 +4494,20 @@ static int raid10_start_reshape(struct mddev *mddev)
 
 		/*
 		 * some node is already performing reshape, and no need to
-		 * call md_bitmap_resize again since it should be called when
+		 * call bitmap_ops->resize again since it should be called when
 		 * receiving BITMAP_RESIZE msg
 		 */
 		if ((sb && (le32_to_cpu(sb->feature_map) &
 			    MD_FEATURE_RESHAPE_ACTIVE)) || (oldsize == newsize))
 			goto out;
 
-		ret = md_bitmap_resize(mddev, newsize, 0, false);
+		ret = mddev->bitmap_ops->resize(mddev, newsize, 0, false);
 		if (ret)
 			goto abort;
 
 		ret = md_cluster_ops->resize_bitmaps(mddev, newsize, oldsize);
 		if (ret) {
-			md_bitmap_resize(mddev, oldsize, 0, false);
+			mddev->bitmap_ops->resize(mddev, oldsize, 0, false);
 			goto abort;
 		}
 	}
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 47c89f7b1dfe..c84a7e0263cd 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -8323,7 +8323,7 @@ static int raid5_resize(struct mddev *mddev, sector_t sectors)
 	    mddev->array_sectors > newsize)
 		return -EINVAL;
 
-	ret = md_bitmap_resize(mddev, sectors, 0, false);
+	ret = mddev->bitmap_ops->resize(mddev, sectors, 0, false);
 	if (ret)
 		return ret;
 
-- 
2.39.2

[PATCH md-6.12 35/41] md/md-bitmap: merge get_bitmap_from_slot() into bitmap_operations

[Yu Kuai]

From: Yu Kuai <yukuai3@huawei.com>

So that the implementation won't be exposed, and it'll be possible
to invent a new bitmap by replacing bitmap_operations.

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
---
 drivers/md/md-bitmap.c  | 6 +++---
 drivers/md/md-bitmap.h  | 2 +-
 drivers/md/md-cluster.c | 4 ++--
 3 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/md/md-bitmap.c b/drivers/md/md-bitmap.c
index 160b0bd54de8..b79fb7df4df3 100644
--- a/drivers/md/md-bitmap.c
+++ b/drivers/md/md-bitmap.c
@@ -2064,7 +2064,7 @@ static int bitmap_load(struct mddev *mddev)
 }
 
 /* caller need to free returned bitmap with md_bitmap_free() */
-struct bitmap *get_bitmap_from_slot(struct mddev *mddev, int slot)
+static struct bitmap *bitmap_get_from_slot(struct mddev *mddev, int slot)
 {
 	int rv = 0;
 	struct bitmap *bitmap;
@@ -2083,7 +2083,6 @@ struct bitmap *get_bitmap_from_slot(struct mddev *mddev, int slot)
 
 	return bitmap;
 }
-EXPORT_SYMBOL(get_bitmap_from_slot);
 
 /* Loads the bitmap associated with slot and copies the resync information
  * to our bitmap
@@ -2096,7 +2095,7 @@ int md_bitmap_copy_from_slot(struct mddev *mddev, int slot,
 	struct bitmap_counts *counts;
 	struct bitmap *bitmap;
 
-	bitmap = get_bitmap_from_slot(mddev, slot);
+	bitmap = bitmap_get_from_slot(mddev, slot);
 	if (IS_ERR(bitmap)) {
 		pr_err("%s can't get bitmap from slot %d\n", __func__, slot);
 		return -1;
@@ -2774,6 +2773,7 @@ static struct bitmap_operations bitmap_ops = {
 	.get_stats		= bitmap_get_stats,
 
 	.sync_with_cluster	= bitmap_sync_with_cluster,
+	.get_from_slot		= bitmap_get_from_slot,
 };
 
 void mddev_set_bitmap_ops(struct mddev *mddev)
diff --git a/drivers/md/md-bitmap.h b/drivers/md/md-bitmap.h
index d05fc2f1451e..6bcb88b71371 100644
--- a/drivers/md/md-bitmap.h
+++ b/drivers/md/md-bitmap.h
@@ -276,6 +276,7 @@ struct bitmap_operations {
 	void (*sync_with_cluster)(struct mddev *mddev,
 				  sector_t old_lo, sector_t old_hi,
 				  sector_t new_lo, sector_t new_hi);
+	struct bitmap *(*get_from_slot)(struct mddev *mddev, int slot);
 };
 
 /* the bitmap API */
@@ -283,7 +284,6 @@ void mddev_set_bitmap_ops(struct mddev *mddev);
 
 /* these are exported */
 
-struct bitmap *get_bitmap_from_slot(struct mddev *mddev, int slot);
 int md_bitmap_copy_from_slot(struct mddev *mddev, int slot,
 			     sector_t *lo, sector_t *hi, bool clear_bits);
 void md_bitmap_set_pages(struct bitmap *bitmap, unsigned long pages);
diff --git a/drivers/md/md-cluster.c b/drivers/md/md-cluster.c
index 21cf0f38cbf8..81c630dcf9ea 100644
--- a/drivers/md/md-cluster.c
+++ b/drivers/md/md-cluster.c
@@ -1169,7 +1169,7 @@ static int resize_bitmaps(struct mddev *mddev, sector_t newsize, sector_t oldsiz
 		if (i == md_cluster_ops->slot_number(mddev))
 			continue;
 
-		bitmap = get_bitmap_from_slot(mddev, i);
+		bitmap = mddev->bitmap_ops->get_from_slot(mddev, i);
 		if (IS_ERR(bitmap)) {
 			pr_err("can't get bitmap from slot %d\n", i);
 			bitmap = NULL;
@@ -1236,7 +1236,7 @@ static int cluster_check_sync_size(struct mddev *mddev)
 		if (i == current_slot)
 			continue;
 
-		bitmap = get_bitmap_from_slot(mddev, i);
+		bitmap = mddev->bitmap_ops->get_from_slot(mddev, i);
 		if (IS_ERR(bitmap)) {
 			pr_err("can't get bitmap from slot %d\n", i);
 			return -1;
-- 
2.39.2

[PATCH md-6.12 36/41] md/md-bitmap: merge md_bitmap_copy_from_slot() into struct bitmap_operation.

[Yu Kuai]

From: Yu Kuai <yukuai3@huawei.com>

So that the implementation won't be exposed, and it'll be possible
to invent a new bitmap by replacing bitmap_operations.

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
---
 drivers/md/md-bitmap.c  | 6 +++---
 drivers/md/md-bitmap.h  | 4 ++--
 drivers/md/md-cluster.c | 6 +++---
 3 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/drivers/md/md-bitmap.c b/drivers/md/md-bitmap.c
index b79fb7df4df3..5e35e8a7a44a 100644
--- a/drivers/md/md-bitmap.c
+++ b/drivers/md/md-bitmap.c
@@ -2087,8 +2087,8 @@ static struct bitmap *bitmap_get_from_slot(struct mddev *mddev, int slot)
 /* Loads the bitmap associated with slot and copies the resync information
  * to our bitmap
  */
-int md_bitmap_copy_from_slot(struct mddev *mddev, int slot,
-		sector_t *low, sector_t *high, bool clear_bits)
+static int bitmap_copy_from_slot(struct mddev *mddev, int slot, sector_t *low,
+				 sector_t *high, bool clear_bits)
 {
 	int rv = 0, i, j;
 	sector_t block, lo = 0, hi = 0;
@@ -2130,7 +2130,6 @@ int md_bitmap_copy_from_slot(struct mddev *mddev, int slot,
 
 	return rv;
 }
-EXPORT_SYMBOL_GPL(md_bitmap_copy_from_slot);
 
 void md_bitmap_set_pages(struct bitmap *bitmap, unsigned long pages)
 {
@@ -2774,6 +2773,7 @@ static struct bitmap_operations bitmap_ops = {
 
 	.sync_with_cluster	= bitmap_sync_with_cluster,
 	.get_from_slot		= bitmap_get_from_slot,
+	.copy_from_slot		= bitmap_copy_from_slot,
 };
 
 void mddev_set_bitmap_ops(struct mddev *mddev)
diff --git a/drivers/md/md-bitmap.h b/drivers/md/md-bitmap.h
index 6bcb88b71371..94d9a6ae244a 100644
--- a/drivers/md/md-bitmap.h
+++ b/drivers/md/md-bitmap.h
@@ -277,6 +277,8 @@ struct bitmap_operations {
 				  sector_t old_lo, sector_t old_hi,
 				  sector_t new_lo, sector_t new_hi);
 	struct bitmap *(*get_from_slot)(struct mddev *mddev, int slot);
+	int (*copy_from_slot)(struct mddev *mddev, int slot, sector_t *lo,
+			      sector_t *hi, bool clear_bits);
 };
 
 /* the bitmap API */
@@ -284,8 +286,6 @@ void mddev_set_bitmap_ops(struct mddev *mddev);
 
 /* these are exported */
 
-int md_bitmap_copy_from_slot(struct mddev *mddev, int slot,
-			     sector_t *lo, sector_t *hi, bool clear_bits);
 void md_bitmap_set_pages(struct bitmap *bitmap, unsigned long pages);
 void md_bitmap_free(struct bitmap *bitmap);
 void md_bitmap_wait_behind_writes(struct mddev *mddev);
diff --git a/drivers/md/md-cluster.c b/drivers/md/md-cluster.c
index 81c630dcf9ea..515f46983ace 100644
--- a/drivers/md/md-cluster.c
+++ b/drivers/md/md-cluster.c
@@ -317,7 +317,7 @@ static void recover_bitmaps(struct md_thread *thread)
 					str, ret);
 			goto clear_bit;
 		}
-		ret = md_bitmap_copy_from_slot(mddev, slot, &lo, &hi, true);
+		ret = mddev->bitmap_ops->copy_from_slot(mddev, slot, &lo, &hi, true);
 		if (ret) {
 			pr_err("md-cluster: Could not copy data from bitmap %d\n", slot);
 			goto clear_bit;
@@ -857,7 +857,7 @@ static int gather_all_resync_info(struct mddev *mddev, int total_slots)
 		}
 
 		/* Read the disk bitmap sb and check if it needs recovery */
-		ret = md_bitmap_copy_from_slot(mddev, i, &lo, &hi, false);
+		ret = mddev->bitmap_ops->copy_from_slot(mddev, i, &lo, &hi, false);
 		if (ret) {
 			pr_warn("md-cluster: Could not gather bitmaps from slot %d", i);
 			lockres_free(bm_lockres);
@@ -1600,7 +1600,7 @@ static int gather_bitmaps(struct md_rdev *rdev)
 	for (sn = 0; sn < mddev->bitmap_info.nodes; sn++) {
 		if (sn == (cinfo->slot_number - 1))
 			continue;
-		err = md_bitmap_copy_from_slot(mddev, sn, &lo, &hi, false);
+		err = mddev->bitmap_ops->copy_from_slot(mddev, sn, &lo, &hi, false);
 		if (err) {
 			pr_warn("md-cluster: Could not gather bitmaps from slot %d", sn);
 			goto out;
-- 
2.39.2

[PATCH md-6.12 37/41] md/md-bitmap: merge md_bitmap_set_pages() into struct bitmap_operations

[Yu Kuai]

From: Yu Kuai <yukuai3@huawei.com>

o that the implementation won't be exposed, and it'll be possible
o invent a new bitmap by replacing bitmap_operations.

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
---
 drivers/md/md-bitmap.c  | 4 ++--
 drivers/md/md-bitmap.h  | 2 +-
 drivers/md/md-cluster.c | 2 +-
 3 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/md/md-bitmap.c b/drivers/md/md-bitmap.c
index 5e35e8a7a44a..fb4195c0dc8d 100644
--- a/drivers/md/md-bitmap.c
+++ b/drivers/md/md-bitmap.c
@@ -2131,11 +2131,10 @@ static int bitmap_copy_from_slot(struct mddev *mddev, int slot, sector_t *low,
 	return rv;
 }
 
-void md_bitmap_set_pages(struct bitmap *bitmap, unsigned long pages)
+static void bitmap_set_pages(struct bitmap *bitmap, unsigned long pages)
 {
 	bitmap->counts.pages = pages;
 }
-EXPORT_SYMBOL_GPL(md_bitmap_set_pages);
 
 static int bitmap_get_stats(struct bitmap *bitmap, struct md_bitmap_stats *stats)
 {
@@ -2774,6 +2773,7 @@ static struct bitmap_operations bitmap_ops = {
 	.sync_with_cluster	= bitmap_sync_with_cluster,
 	.get_from_slot		= bitmap_get_from_slot,
 	.copy_from_slot		= bitmap_copy_from_slot,
+	.set_pages		= bitmap_set_pages,
 };
 
 void mddev_set_bitmap_ops(struct mddev *mddev)
diff --git a/drivers/md/md-bitmap.h b/drivers/md/md-bitmap.h
index 94d9a6ae244a..7fee98e3d517 100644
--- a/drivers/md/md-bitmap.h
+++ b/drivers/md/md-bitmap.h
@@ -279,6 +279,7 @@ struct bitmap_operations {
 	struct bitmap *(*get_from_slot)(struct mddev *mddev, int slot);
 	int (*copy_from_slot)(struct mddev *mddev, int slot, sector_t *lo,
 			      sector_t *hi, bool clear_bits);
+	void (*set_pages)(struct bitmap *bitmap, unsigned long pages);
 };
 
 /* the bitmap API */
@@ -286,7 +287,6 @@ void mddev_set_bitmap_ops(struct mddev *mddev);
 
 /* these are exported */
 
-void md_bitmap_set_pages(struct bitmap *bitmap, unsigned long pages);
 void md_bitmap_free(struct bitmap *bitmap);
 void md_bitmap_wait_behind_writes(struct mddev *mddev);
 
diff --git a/drivers/md/md-cluster.c b/drivers/md/md-cluster.c
index 515f46983ace..3296925b8455 100644
--- a/drivers/md/md-cluster.c
+++ b/drivers/md/md-cluster.c
@@ -1192,7 +1192,7 @@ static int resize_bitmaps(struct mddev *mddev, sector_t newsize, sector_t oldsiz
 		bm_lockres->flags |= DLM_LKF_NOQUEUE;
 		rv = dlm_lock_sync(bm_lockres, DLM_LOCK_PW);
 		if (!rv)
-			md_bitmap_set_pages(bitmap, my_pages);
+			mddev->bitmap_ops->set_pages(bitmap, my_pages);
 		lockres_free(bm_lockres);
 
 		if (my_pages != stats.pages)
-- 
2.39.2

[PATCH md-6.12 38/41] md/md-bitmap: merge md_bitmap_free() into bitmap_operations

[Yu Kuai]

From: Yu Kuai <yukuai3@huawei.com>

So that the implementation won't be exposed, and it'll be possible
o invent a new bitmap by replacing bitmap_operations.

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
---
 drivers/md/md-bitmap.c  |  7 ++-----
 drivers/md/md-bitmap.h  |  3 +--
 drivers/md/md-cluster.c | 12 ++++++------
 3 files changed, 9 insertions(+), 13 deletions(-)

diff --git a/drivers/md/md-bitmap.c b/drivers/md/md-bitmap.c
index fb4195c0dc8d..b5e2b0a2a493 100644
--- a/drivers/md/md-bitmap.c
+++ b/drivers/md/md-bitmap.c
@@ -1828,10 +1828,7 @@ static void bitmap_flush(struct mddev *mddev)
 	bitmap_update_sb(bitmap);
 }
 
-/*
- * free memory that was allocated
- */
-void md_bitmap_free(struct bitmap *bitmap)
+static void md_bitmap_free(struct bitmap *bitmap)
 {
 	unsigned long k, pages;
 	struct bitmap_page *bp;
@@ -1865,7 +1862,6 @@ void md_bitmap_free(struct bitmap *bitmap)
 	kfree(bp);
 	kfree(bitmap);
 }
-EXPORT_SYMBOL(md_bitmap_free);
 
 void md_bitmap_wait_behind_writes(struct mddev *mddev)
 {
@@ -2774,6 +2770,7 @@ static struct bitmap_operations bitmap_ops = {
 	.get_from_slot		= bitmap_get_from_slot,
 	.copy_from_slot		= bitmap_copy_from_slot,
 	.set_pages		= bitmap_set_pages,
+	.free			= md_bitmap_free,
 };
 
 void mddev_set_bitmap_ops(struct mddev *mddev)
diff --git a/drivers/md/md-bitmap.h b/drivers/md/md-bitmap.h
index 7fee98e3d517..7f6cc6f616b3 100644
--- a/drivers/md/md-bitmap.h
+++ b/drivers/md/md-bitmap.h
@@ -280,14 +280,13 @@ struct bitmap_operations {
 	int (*copy_from_slot)(struct mddev *mddev, int slot, sector_t *lo,
 			      sector_t *hi, bool clear_bits);
 	void (*set_pages)(struct bitmap *bitmap, unsigned long pages);
+	void (*free)(struct bitmap *bitmap);
 };
 
 /* the bitmap API */
 void mddev_set_bitmap_ops(struct mddev *mddev);
 
 /* these are exported */
-
-void md_bitmap_free(struct bitmap *bitmap);
 void md_bitmap_wait_behind_writes(struct mddev *mddev);
 
 static inline bool md_bitmap_enabled(struct bitmap *bitmap)
diff --git a/drivers/md/md-cluster.c b/drivers/md/md-cluster.c
index 3296925b8455..7647ce4f76fa 100644
--- a/drivers/md/md-cluster.c
+++ b/drivers/md/md-cluster.c
@@ -1201,12 +1201,12 @@ static int resize_bitmaps(struct mddev *mddev, sector_t newsize, sector_t oldsiz
 			 * can't resize bitmap
 			 */
 			goto out;
-		md_bitmap_free(bitmap);
+		mddev->bitmap_ops->free(bitmap);
 	}
 
 	return 0;
 out:
-	md_bitmap_free(bitmap);
+	mddev->bitmap_ops->free(bitmap);
 	update_bitmap_size(mddev, oldsize);
 	return -1;
 }
@@ -1250,7 +1250,7 @@ static int cluster_check_sync_size(struct mddev *mddev)
 		bm_lockres = lockres_init(mddev, str, NULL, 1);
 		if (!bm_lockres) {
 			pr_err("md-cluster: Cannot initialize %s\n", str);
-			md_bitmap_free(bitmap);
+			mddev->bitmap_ops->free(bitmap);
 			return -1;
 		}
 		bm_lockres->flags |= DLM_LKF_NOQUEUE;
@@ -1261,17 +1261,17 @@ static int cluster_check_sync_size(struct mddev *mddev)
 
 		rv = mddev->bitmap_ops->get_stats(bitmap, &stats);
 		if (rv) {
-			md_bitmap_free(bitmap);
+			mddev->bitmap_ops->free(bitmap);
 			return rv;
 		}
 
 		if (sync_size == 0) {
 			sync_size = stats.sync_size;
 		} else if (sync_size != stats.sync_size) {
-			md_bitmap_free(bitmap);
+			mddev->bitmap_ops->free(bitmap);
 			return -1;
 		}
-		md_bitmap_free(bitmap);
+		mddev->bitmap_ops->free(bitmap);
 	}
 
 	return (my_sync_size == sync_size) ? 0 : -1;
-- 
2.39.2

[PATCH md-6.12 39/41] md/md-bitmap: merge md_bitmap_wait_behind_writes() into bitmap_operations

[Yu Kuai]

From: Yu Kuai <yukuai3@huawei.com>

So that the implementation won't be exposed, and it'll be possible
to invent a new bitmap by replacing bitmap_operations.

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
---
 drivers/md/md-bitmap.c | 6 +++---
 drivers/md/md-bitmap.h | 4 +---
 drivers/md/md.c        | 2 +-
 drivers/md/raid1.c     | 2 +-
 4 files changed, 6 insertions(+), 8 deletions(-)

diff --git a/drivers/md/md-bitmap.c b/drivers/md/md-bitmap.c
index b5e2b0a2a493..c96782c69cc9 100644
--- a/drivers/md/md-bitmap.c
+++ b/drivers/md/md-bitmap.c
@@ -1863,7 +1863,7 @@ static void md_bitmap_free(struct bitmap *bitmap)
 	kfree(bitmap);
 }
 
-void md_bitmap_wait_behind_writes(struct mddev *mddev)
+static void bitmap_wait_behind_writes(struct mddev *mddev)
 {
 	struct bitmap *bitmap = mddev->bitmap;
 
@@ -1876,7 +1876,6 @@ void md_bitmap_wait_behind_writes(struct mddev *mddev)
 			   atomic_read(&bitmap->behind_writes) == 0);
 	}
 }
-EXPORT_SYMBOL_GPL(md_bitmap_wait_behind_writes);
 
 static void bitmap_destroy(struct mddev *mddev)
 {
@@ -1885,7 +1884,7 @@ static void bitmap_destroy(struct mddev *mddev)
 	if (!bitmap) /* there was no bitmap */
 		return;
 
-	md_bitmap_wait_behind_writes(mddev);
+	bitmap_wait_behind_writes(mddev);
 	if (!mddev->serialize_policy)
 		mddev_destroy_serial_pool(mddev, NULL);
 
@@ -2755,6 +2754,7 @@ static struct bitmap_operations bitmap_ops = {
 	.dirty_bits		= bitmap_dirty_bits,
 	.unplug			= bitmap_unplug,
 	.daemon_work		= bitmap_daemon_work,
+	.wait_behind_writes	= bitmap_wait_behind_writes,
 
 	.startwrite		= bitmap_startwrite,
 	.endwrite		= bitmap_endwrite,
diff --git a/drivers/md/md-bitmap.h b/drivers/md/md-bitmap.h
index 7f6cc6f616b3..bc9cb4ca676e 100644
--- a/drivers/md/md-bitmap.h
+++ b/drivers/md/md-bitmap.h
@@ -259,6 +259,7 @@ struct bitmap_operations {
 			   unsigned long e);
 	void (*unplug)(struct mddev *mddev, bool sync);
 	void (*daemon_work)(struct mddev *mddev);
+	void (*wait_behind_writes)(struct mddev *mddev);
 
 	int (*startwrite)(struct mddev *mddev, sector_t offset,
 			  unsigned long sectors, bool behind);
@@ -286,9 +287,6 @@ struct bitmap_operations {
 /* the bitmap API */
 void mddev_set_bitmap_ops(struct mddev *mddev);
 
-/* these are exported */
-void md_bitmap_wait_behind_writes(struct mddev *mddev);
-
 static inline bool md_bitmap_enabled(struct bitmap *bitmap)
 {
 	return bitmap && bitmap->storage.filemap &&
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 4046df5dc33e..a38981de8901 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -6498,7 +6498,7 @@ EXPORT_SYMBOL_GPL(md_stop_writes);
 
 static void mddev_detach(struct mddev *mddev)
 {
-	md_bitmap_wait_behind_writes(mddev);
+	mddev->bitmap_ops->wait_behind_writes(mddev);
 	if (mddev->pers && mddev->pers->quiesce && !is_md_suspended(mddev)) {
 		mddev->pers->quiesce(mddev, 1);
 		mddev->pers->quiesce(mddev, 0);
diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index c3bdc819e5e8..52a707e39a4d 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -1384,7 +1384,7 @@ static void raid1_read_request(struct mddev *mddev, struct bio *bio,
 		 * over-take any writes that are 'behind'
 		 */
 		mddev_add_trace_msg(mddev, "raid1 wait behind writes");
-		md_bitmap_wait_behind_writes(mddev);
+		mddev->bitmap_ops->wait_behind_writes(mddev);
 	}
 
 	if (max_sectors < bio_sectors(bio)) {
-- 
2.39.2

[PATCH md-6.12 40/41] md/md-bitmap: merge md_bitmap_enabled() into bitmap_operations

[Yu Kuai]

From: Yu Kuai <yukuai3@huawei.com>

So that the implementation won't be exposed, and it'll be possible
to invent a new bitmap by replacing bitmap_operations.

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
---
 drivers/md/md-bitmap.c | 19 ++++++++++++++++++-
 drivers/md/md-bitmap.h |  8 +-------
 drivers/md/raid1-10.c  |  2 +-
 3 files changed, 20 insertions(+), 9 deletions(-)

diff --git a/drivers/md/md-bitmap.c b/drivers/md/md-bitmap.c
index c96782c69cc9..48a81c144daf 100644
--- a/drivers/md/md-bitmap.c
+++ b/drivers/md/md-bitmap.c
@@ -40,6 +40,22 @@ static inline char *bmname(struct bitmap *bitmap)
 	return bitmap->mddev ? mdname(bitmap->mddev) : "mdX";
 }
 
+static bool __bitmap_enabled(struct bitmap *bitmap)
+{
+	return bitmap->storage.filemap &&
+	       !test_bit(BITMAP_STALE, &bitmap->flags);
+}
+
+static bool bitmap_enabled(struct mddev *mddev)
+{
+	struct bitmap *bitmap = mddev->bitmap;
+
+	if (!bitmap)
+		return false;
+
+	return __bitmap_enabled(bitmap);
+}
+
 /*
  * check a page and, if necessary, allocate it (or hijack it if the alloc fails)
  *
@@ -1035,7 +1051,7 @@ static void __bitmap_unplug(struct bitmap *bitmap)
 	int dirty, need_write;
 	int writing = 0;
 
-	if (!md_bitmap_enabled(bitmap))
+	if (!__bitmap_enabled(bitmap))
 		return;
 
 	/* look at each page to see if there are any set bits that need to be
@@ -2745,6 +2761,7 @@ const struct attribute_group md_bitmap_group = {
 };
 
 static struct bitmap_operations bitmap_ops = {
+	.enabled		= bitmap_enabled,
 	.create			= bitmap_create,
 	.resize			= bitmap_resize,
 	.load			= bitmap_load,
diff --git a/drivers/md/md-bitmap.h b/drivers/md/md-bitmap.h
index bc9cb4ca676e..c720729687e2 100644
--- a/drivers/md/md-bitmap.h
+++ b/drivers/md/md-bitmap.h
@@ -247,6 +247,7 @@ struct md_bitmap_stats {
 };
 
 struct bitmap_operations {
+	bool (*enabled)(struct mddev *mddev);
 	int (*create)(struct mddev *mddev, int slot);
 	int (*resize)(struct mddev *mddev, sector_t blocks, int chunksize,
 		      bool init);
@@ -287,12 +288,5 @@ struct bitmap_operations {
 /* the bitmap API */
 void mddev_set_bitmap_ops(struct mddev *mddev);
 
-static inline bool md_bitmap_enabled(struct bitmap *bitmap)
-{
-	return bitmap && bitmap->storage.filemap &&
-	       !test_bit(BITMAP_STALE, &bitmap->flags);
-}
-
 #endif
-
 #endif
diff --git a/drivers/md/raid1-10.c b/drivers/md/raid1-10.c
index e8207513eb1b..4378d3250bd7 100644
--- a/drivers/md/raid1-10.c
+++ b/drivers/md/raid1-10.c
@@ -140,7 +140,7 @@ static inline bool raid1_add_bio_to_plug(struct mddev *mddev, struct bio *bio,
 	 * If bitmap is not enabled, it's safe to submit the io directly, and
 	 * this can get optimal performance.
 	 */
-	if (!md_bitmap_enabled(mddev->bitmap)) {
+	if (!mddev->bitmap_ops->enabled(mddev)) {
 		raid1_submit_write(bio);
 		return true;
 	}
-- 
2.39.2

[PATCH md-6.12 41/41] md/md-bitmap: make in memory structure internal

[Yu Kuai]

From: Yu Kuai <yukuai3@huawei.com>

Now that struct btimap_page and bitmap is not used external anymore,
move them from md-bitmap.h to md-bitmap.c.(expect that dm-raid is still
using define marco 'COUNTER_MAX').

Also fix some checkpatch warnings.

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
---
 drivers/md/md-bitmap.c  | 247 ++++++++++++++++++++++++++++++++++++----
 drivers/md/md-bitmap.h  | 189 +-----------------------------
 drivers/md/md-cluster.c |   4 +-
 drivers/md/md.h         |   2 +-
 drivers/md/raid1.c      |   5 +-
 5 files changed, 235 insertions(+), 212 deletions(-)

diff --git a/drivers/md/md-bitmap.c b/drivers/md/md-bitmap.c
index 48a81c144daf..4f278cdf7b99 100644
--- a/drivers/md/md-bitmap.c
+++ b/drivers/md/md-bitmap.c
@@ -32,6 +32,186 @@
 #include "md.h"
 #include "md-bitmap.h"
 
+#define BITMAP_MAJOR_LO 3
+/* version 4 insists the bitmap is in little-endian order
+ * with version 3, it is host-endian which is non-portable
+ * Version 5 is currently set only for clustered devices
+ */
+#define BITMAP_MAJOR_HI 4
+#define BITMAP_MAJOR_CLUSTERED 5
+#define	BITMAP_MAJOR_HOSTENDIAN 3
+
+/*
+ * in-memory bitmap:
+ *
+ * Use 16 bit block counters to track pending writes to each "chunk".
+ * The 2 high order bits are special-purpose, the first is a flag indicating
+ * whether a resync is needed.  The second is a flag indicating whether a
+ * resync is active.
+ * This means that the counter is actually 14 bits:
+ *
+ * +--------+--------+------------------------------------------------+
+ * | resync | resync |               counter                          |
+ * | needed | active |                                                |
+ * |  (0-1) |  (0-1) |              (0-16383)                         |
+ * +--------+--------+------------------------------------------------+
+ *
+ * The "resync needed" bit is set when:
+ *    a '1' bit is read from storage at startup.
+ *    a write request fails on some drives
+ *    a resync is aborted on a chunk with 'resync active' set
+ * It is cleared (and resync-active set) when a resync starts across all drives
+ * of the chunk.
+ *
+ *
+ * The "resync active" bit is set when:
+ *    a resync is started on all drives, and resync_needed is set.
+ *       resync_needed will be cleared (as long as resync_active wasn't already set).
+ * It is cleared when a resync completes.
+ *
+ * The counter counts pending write requests, plus the on-disk bit.
+ * When the counter is '1' and the resync bits are clear, the on-disk
+ * bit can be cleared as well, thus setting the counter to 0.
+ * When we set a bit, or in the counter (to start a write), if the fields is
+ * 0, we first set the disk bit and set the counter to 1.
+ *
+ * If the counter is 0, the on-disk bit is clear and the stripe is clean
+ * Anything that dirties the stripe pushes the counter to 2 (at least)
+ * and sets the on-disk bit (lazily).
+ * If a periodic sweep find the counter at 2, it is decremented to 1.
+ * If the sweep find the counter at 1, the on-disk bit is cleared and the
+ * counter goes to zero.
+ *
+ * Also, we'll hijack the "map" pointer itself and use it as two 16 bit block
+ * counters as a fallback when "page" memory cannot be allocated:
+ *
+ * Normal case (page memory allocated):
+ *
+ *     page pointer (32-bit)
+ *
+ *     [ ] ------+
+ *               |
+ *               +-------> [   ][   ]..[   ] (4096 byte page == 2048 counters)
+ *                          c1   c2    c2048
+ *
+ * Hijacked case (page memory allocation failed):
+ *
+ *     hijacked page pointer (32-bit)
+ *
+ *     [		  ][		  ] (no page memory allocated)
+ *      counter #1 (16-bit) counter #2 (16-bit)
+ *
+ */
+
+#define PAGE_BITS (PAGE_SIZE << 3)
+#define PAGE_BIT_SHIFT (PAGE_SHIFT + 3)
+
+#define NEEDED(x) (((bitmap_counter_t) x) & NEEDED_MASK)
+#define RESYNC(x) (((bitmap_counter_t) x) & RESYNC_MASK)
+#define COUNTER(x) (((bitmap_counter_t) x) & COUNTER_MAX)
+
+/* how many counters per page? */
+#define PAGE_COUNTER_RATIO (PAGE_BITS / COUNTER_BITS)
+/* same, except a shift value for more efficient bitops */
+#define PAGE_COUNTER_SHIFT (PAGE_BIT_SHIFT - COUNTER_BIT_SHIFT)
+/* same, except a mask value for more efficient bitops */
+#define PAGE_COUNTER_MASK  (PAGE_COUNTER_RATIO - 1)
+
+#define BITMAP_BLOCK_SHIFT 9
+
+/*
+ * bitmap structures:
+ */
+
+/* the in-memory bitmap is represented by bitmap_pages */
+struct bitmap_page {
+	/*
+	 * map points to the actual memory page
+	 */
+	char *map;
+	/*
+	 * in emergencies (when map cannot be alloced), hijack the map
+	 * pointer and use it as two counters itself
+	 */
+	unsigned int hijacked:1;
+	/*
+	 * If any counter in this page is '1' or '2' - and so could be
+	 * cleared then that page is marked as 'pending'
+	 */
+	unsigned int pending:1;
+	/*
+	 * count of dirty bits on the page
+	 */
+	unsigned int  count:30;
+};
+
+/* the main bitmap structure - one per mddev */
+struct bitmap {
+
+	struct bitmap_counts {
+		spinlock_t lock;
+		struct bitmap_page *bp;
+		/* total number of pages in the bitmap */
+		unsigned long pages;
+		/* number of pages not yet allocated */
+		unsigned long missing_pages;
+		/* chunksize = 2^chunkshift (for bitops) */
+		unsigned long chunkshift;
+		/* total number of data chunks for the array */
+		unsigned long chunks;
+	} counts;
+
+	struct mddev *mddev; /* the md device that the bitmap is for */
+
+	__u64	events_cleared;
+	int need_sync;
+
+	struct bitmap_storage {
+		/* backing disk file */
+		struct file *file;
+		/* cached copy of the bitmap file superblock */
+		struct page *sb_page;
+		unsigned long sb_index;
+		/* list of cache pages for the file */
+		struct page **filemap;
+		/* attributes associated filemap pages */
+		unsigned long *filemap_attr;
+		/* number of pages in the file */
+		unsigned long file_pages;
+		/* total bytes in the bitmap */
+		unsigned long bytes;
+	} storage;
+
+	unsigned long flags;
+
+	int allclean;
+
+	atomic_t behind_writes;
+	/* highest actual value at runtime */
+	unsigned long behind_writes_used;
+
+	/*
+	 * the bitmap daemon - periodically wakes up and sweeps the bitmap
+	 * file, cleaning up bits and flushing out pages to disk as necessary
+	 */
+	unsigned long daemon_lastrun; /* jiffies of last run */
+	/*
+	 * when we lasted called end_sync to update bitmap with resync
+	 * progress.
+	 */
+	unsigned long last_end_sync;
+
+	/* pending writes to the bitmap file */
+	atomic_t pending_writes;
+	wait_queue_head_t write_wait;
+	wait_queue_head_t overflow_wait;
+	wait_queue_head_t behind_wait;
+
+	struct kernfs_node *sysfs_can_clear;
+	/* slot offset for clustered env */
+	int cluster_slot;
+};
+
 static int bitmap_resize(struct mddev *mddev, sector_t blocks, int chunksize,
 			 bool init);
 
@@ -491,9 +671,10 @@ static void md_bitmap_wait_writes(struct bitmap *bitmap)
 
 
 /* update the event counter and sync the superblock to disk */
-static void bitmap_update_sb(struct bitmap *bitmap)
+static void bitmap_update_sb(void *data)
 {
 	bitmap_super_t *sb;
+	struct bitmap *bitmap = data;
 
 	if (!bitmap || !bitmap->mddev) /* no bitmap for this array */
 		return;
@@ -1844,10 +2025,11 @@ static void bitmap_flush(struct mddev *mddev)
 	bitmap_update_sb(bitmap);
 }
 
-static void md_bitmap_free(struct bitmap *bitmap)
+static void md_bitmap_free(void *data)
 {
 	unsigned long k, pages;
 	struct bitmap_page *bp;
+	struct bitmap *bitmap = data;
 
 	if (!bitmap) /* there was no bitmap */
 		return;
@@ -2075,7 +2257,7 @@ static int bitmap_load(struct mddev *mddev)
 }
 
 /* caller need to free returned bitmap with md_bitmap_free() */
-static struct bitmap *bitmap_get_from_slot(struct mddev *mddev, int slot)
+static void *bitmap_get_from_slot(struct mddev *mddev, int slot)
 {
 	int rv = 0;
 	struct bitmap *bitmap;
@@ -2142,15 +2324,18 @@ static int bitmap_copy_from_slot(struct mddev *mddev, int slot, sector_t *low,
 	return rv;
 }
 
-static void bitmap_set_pages(struct bitmap *bitmap, unsigned long pages)
+static void bitmap_set_pages(void *data, unsigned long pages)
 {
+	struct bitmap *bitmap = data;
+
 	bitmap->counts.pages = pages;
 }
 
-static int bitmap_get_stats(struct bitmap *bitmap, struct md_bitmap_stats *stats)
+static int bitmap_get_stats(void *data, struct md_bitmap_stats *stats)
 {
 	struct bitmap_storage *storage;
 	struct bitmap_counts *counts;
+	struct bitmap *bitmap = data;
 	bitmap_super_t *sb;
 
 	if (!bitmap)
@@ -2502,6 +2687,7 @@ space_show(struct mddev *mddev, char *page)
 static ssize_t
 space_store(struct mddev *mddev, const char *buf, size_t len)
 {
+	struct bitmap *bitmap;
 	unsigned long sectors;
 	int rv;
 
@@ -2512,8 +2698,8 @@ space_store(struct mddev *mddev, const char *buf, size_t len)
 	if (sectors == 0)
 		return -EINVAL;
 
-	if (mddev->bitmap &&
-	    sectors < (mddev->bitmap->storage.bytes + 511) >> 9)
+	bitmap = mddev->bitmap;
+	if (bitmap && sectors < (bitmap->storage.bytes + 511) >> 9)
 		return -EFBIG; /* Bitmap is too big for this small space */
 
 	/* could make sure it isn't too big, but that isn't really
@@ -2690,10 +2876,13 @@ __ATTR(metadata, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
 static ssize_t can_clear_show(struct mddev *mddev, char *page)
 {
 	int len;
+	struct bitmap *bitmap;
+
 	spin_lock(&mddev->lock);
-	if (mddev->bitmap)
-		len = sprintf(page, "%s\n", (mddev->bitmap->need_sync ?
-					     "false" : "true"));
+	bitmap = mddev->bitmap;
+	if (bitmap)
+		len = sprintf(page, "%s\n", (bitmap->need_sync ? "false" :
+								 "true"));
 	else
 		len = sprintf(page, "\n");
 	spin_unlock(&mddev->lock);
@@ -2702,17 +2891,24 @@ static ssize_t can_clear_show(struct mddev *mddev, char *page)
 
 static ssize_t can_clear_store(struct mddev *mddev, const char *buf, size_t len)
 {
-	if (mddev->bitmap == NULL)
+	struct bitmap *bitmap = mddev->bitmap;
+
+	if (!bitmap)
 		return -ENOENT;
-	if (strncmp(buf, "false", 5) == 0)
-		mddev->bitmap->need_sync = 1;
-	else if (strncmp(buf, "true", 4) == 0) {
+
+	if (strncmp(buf, "false", 5) == 0) {
+		bitmap->need_sync = 1;
+		return len;
+	}
+
+	if (strncmp(buf, "true", 4) == 0) {
 		if (mddev->degraded)
 			return -EBUSY;
-		mddev->bitmap->need_sync = 0;
-	} else
-		return -EINVAL;
-	return len;
+		bitmap->need_sync = 0;
+		return len;
+	}
+
+	return -EINVAL;
 }
 
 static struct md_sysfs_entry bitmap_can_clear =
@@ -2722,21 +2918,26 @@ static ssize_t
 behind_writes_used_show(struct mddev *mddev, char *page)
 {
 	ssize_t ret;
+	struct bitmap *bitmap;
+
 	spin_lock(&mddev->lock);
-	if (mddev->bitmap == NULL)
+	bitmap = mddev->bitmap;
+	if (!bitmap)
 		ret = sprintf(page, "0\n");
 	else
-		ret = sprintf(page, "%lu\n",
-			      mddev->bitmap->behind_writes_used);
+		ret = sprintf(page, "%lu\n", bitmap->behind_writes_used);
 	spin_unlock(&mddev->lock);
+
 	return ret;
 }
 
 static ssize_t
 behind_writes_used_reset(struct mddev *mddev, const char *buf, size_t len)
 {
-	if (mddev->bitmap)
-		mddev->bitmap->behind_writes_used = 0;
+	struct bitmap *bitmap = mddev->bitmap;
+
+	if (bitmap)
+		bitmap->behind_writes_used = 0;
 	return len;
 }
 
diff --git a/drivers/md/md-bitmap.h b/drivers/md/md-bitmap.h
index c720729687e2..662e6fc141a7 100644
--- a/drivers/md/md-bitmap.h
+++ b/drivers/md/md-bitmap.h
@@ -7,81 +7,7 @@
 #ifndef BITMAP_H
 #define BITMAP_H 1
 
-#define BITMAP_MAJOR_LO 3
-/* version 4 insists the bitmap is in little-endian order
- * with version 3, it is host-endian which is non-portable
- * Version 5 is currently set only for clustered devices
- */
-#define BITMAP_MAJOR_HI 4
-#define BITMAP_MAJOR_CLUSTERED 5
-#define	BITMAP_MAJOR_HOSTENDIAN 3
-
-/*
- * in-memory bitmap:
- *
- * Use 16 bit block counters to track pending writes to each "chunk".
- * The 2 high order bits are special-purpose, the first is a flag indicating
- * whether a resync is needed.  The second is a flag indicating whether a
- * resync is active.
- * This means that the counter is actually 14 bits:
- *
- * +--------+--------+------------------------------------------------+
- * | resync | resync |               counter                          |
- * | needed | active |                                                |
- * |  (0-1) |  (0-1) |              (0-16383)                         |
- * +--------+--------+------------------------------------------------+
- *
- * The "resync needed" bit is set when:
- *    a '1' bit is read from storage at startup.
- *    a write request fails on some drives
- *    a resync is aborted on a chunk with 'resync active' set
- * It is cleared (and resync-active set) when a resync starts across all drives
- * of the chunk.
- *
- *
- * The "resync active" bit is set when:
- *    a resync is started on all drives, and resync_needed is set.
- *       resync_needed will be cleared (as long as resync_active wasn't already set).
- * It is cleared when a resync completes.
- *
- * The counter counts pending write requests, plus the on-disk bit.
- * When the counter is '1' and the resync bits are clear, the on-disk
- * bit can be cleared as well, thus setting the counter to 0.
- * When we set a bit, or in the counter (to start a write), if the fields is
- * 0, we first set the disk bit and set the counter to 1.
- *
- * If the counter is 0, the on-disk bit is clear and the stripe is clean
- * Anything that dirties the stripe pushes the counter to 2 (at least)
- * and sets the on-disk bit (lazily).
- * If a periodic sweep find the counter at 2, it is decremented to 1.
- * If the sweep find the counter at 1, the on-disk bit is cleared and the
- * counter goes to zero.
- *
- * Also, we'll hijack the "map" pointer itself and use it as two 16 bit block
- * counters as a fallback when "page" memory cannot be allocated:
- *
- * Normal case (page memory allocated):
- *
- *     page pointer (32-bit)
- *
- *     [ ] ------+
- *               |
- *               +-------> [   ][   ]..[   ] (4096 byte page == 2048 counters)
- *                          c1   c2    c2048
- *
- * Hijacked case (page memory allocation failed):
- *
- *     hijacked page pointer (32-bit)
- *
- *     [		  ][		  ] (no page memory allocated)
- *      counter #1 (16-bit) counter #2 (16-bit)
- *
- */
-
-#ifdef __KERNEL__
-
-#define PAGE_BITS (PAGE_SIZE << 3)
-#define PAGE_BIT_SHIFT (PAGE_SHIFT + 3)
+#define BITMAP_MAGIC 0x6d746962
 
 typedef __u16 bitmap_counter_t;
 #define COUNTER_BITS 16
@@ -91,26 +17,6 @@ typedef __u16 bitmap_counter_t;
 #define NEEDED_MASK ((bitmap_counter_t) (1 << (COUNTER_BITS - 1)))
 #define RESYNC_MASK ((bitmap_counter_t) (1 << (COUNTER_BITS - 2)))
 #define COUNTER_MAX ((bitmap_counter_t) RESYNC_MASK - 1)
-#define NEEDED(x) (((bitmap_counter_t) x) & NEEDED_MASK)
-#define RESYNC(x) (((bitmap_counter_t) x) & RESYNC_MASK)
-#define COUNTER(x) (((bitmap_counter_t) x) & COUNTER_MAX)
-
-/* how many counters per page? */
-#define PAGE_COUNTER_RATIO (PAGE_BITS / COUNTER_BITS)
-/* same, except a shift value for more efficient bitops */
-#define PAGE_COUNTER_SHIFT (PAGE_BIT_SHIFT - COUNTER_BIT_SHIFT)
-/* same, except a mask value for more efficient bitops */
-#define PAGE_COUNTER_MASK  (PAGE_COUNTER_RATIO - 1)
-
-#define BITMAP_BLOCK_SHIFT 9
-
-#endif
-
-/*
- * bitmap structures:
- */
-
-#define BITMAP_MAGIC 0x6d746962
 
 /* use these for bitmap->flags and bitmap->sb->state bit-fields */
 enum bitmap_state {
@@ -152,88 +58,6 @@ typedef struct bitmap_super_s {
  *    devices.  For raid10 it is the size of the array.
  */
 
-#ifdef __KERNEL__
-
-/* the in-memory bitmap is represented by bitmap_pages */
-struct bitmap_page {
-	/*
-	 * map points to the actual memory page
-	 */
-	char *map;
-	/*
-	 * in emergencies (when map cannot be alloced), hijack the map
-	 * pointer and use it as two counters itself
-	 */
-	unsigned int hijacked:1;
-	/*
-	 * If any counter in this page is '1' or '2' - and so could be
-	 * cleared then that page is marked as 'pending'
-	 */
-	unsigned int pending:1;
-	/*
-	 * count of dirty bits on the page
-	 */
-	unsigned int  count:30;
-};
-
-/* the main bitmap structure - one per mddev */
-struct bitmap {
-
-	struct bitmap_counts {
-		spinlock_t lock;
-		struct bitmap_page *bp;
-		unsigned long pages;		/* total number of pages
-						 * in the bitmap */
-		unsigned long missing_pages;	/* number of pages
-						 * not yet allocated */
-		unsigned long chunkshift;	/* chunksize = 2^chunkshift
-						 * (for bitops) */
-		unsigned long chunks;		/* Total number of data
-						 * chunks for the array */
-	} counts;
-
-	struct mddev *mddev; /* the md device that the bitmap is for */
-
-	__u64	events_cleared;
-	int need_sync;
-
-	struct bitmap_storage {
-		struct file *file;		/* backing disk file */
-		struct page *sb_page;		/* cached copy of the bitmap
-						 * file superblock */
-		unsigned long sb_index;
-		struct page **filemap;		/* list of cache pages for
-						 * the file */
-		unsigned long *filemap_attr;	/* attributes associated
-						 * w/ filemap pages */
-		unsigned long file_pages;	/* number of pages in the file*/
-		unsigned long bytes;		/* total bytes in the bitmap */
-	} storage;
-
-	unsigned long flags;
-
-	int allclean;
-
-	atomic_t behind_writes;
-	unsigned long behind_writes_used; /* highest actual value at runtime */
-
-	/*
-	 * the bitmap daemon - periodically wakes up and sweeps the bitmap
-	 * file, cleaning up bits and flushing out pages to disk as necessary
-	 */
-	unsigned long daemon_lastrun; /* jiffies of last run */
-	unsigned long last_end_sync; /* when we lasted called end_sync to
-				      * update bitmap with resync progress */
-
-	atomic_t pending_writes; /* pending writes to the bitmap file */
-	wait_queue_head_t write_wait;
-	wait_queue_head_t overflow_wait;
-	wait_queue_head_t behind_wait;
-
-	struct kernfs_node *sysfs_can_clear;
-	int cluster_slot;		/* Slot offset for clustered env */
-};
-
 struct md_bitmap_stats {
 	u64		events_cleared;
 	int		behind_writes;
@@ -272,21 +96,20 @@ struct bitmap_operations {
 	void (*cond_end_sync)(struct mddev *mddev, sector_t sector, bool force);
 	void (*close_sync)(struct mddev *mddev);
 
-	void (*update_sb)(struct bitmap *bitmap);
-	int (*get_stats)(struct bitmap *bitmap, struct md_bitmap_stats *stats);
+	void (*update_sb)(void *data);
+	int (*get_stats)(void *data, struct md_bitmap_stats *stats);
 
 	void (*sync_with_cluster)(struct mddev *mddev,
 				  sector_t old_lo, sector_t old_hi,
 				  sector_t new_lo, sector_t new_hi);
-	struct bitmap *(*get_from_slot)(struct mddev *mddev, int slot);
+	void *(*get_from_slot)(struct mddev *mddev, int slot);
 	int (*copy_from_slot)(struct mddev *mddev, int slot, sector_t *lo,
 			      sector_t *hi, bool clear_bits);
-	void (*set_pages)(struct bitmap *bitmap, unsigned long pages);
-	void (*free)(struct bitmap *bitmap);
+	void (*set_pages)(void *data, unsigned long pages);
+	void (*free)(void *data);
 };
 
 /* the bitmap API */
 void mddev_set_bitmap_ops(struct mddev *mddev);
 
 #endif
-#endif
diff --git a/drivers/md/md-cluster.c b/drivers/md/md-cluster.c
index 7647ce4f76fa..6595f89becdb 100644
--- a/drivers/md/md-cluster.c
+++ b/drivers/md/md-cluster.c
@@ -1144,7 +1144,7 @@ static int update_bitmap_size(struct mddev *mddev, sector_t size)
 
 static int resize_bitmaps(struct mddev *mddev, sector_t newsize, sector_t oldsize)
 {
-	struct bitmap *bitmap = mddev->bitmap;
+	void *bitmap = mddev->bitmap;
 	struct md_bitmap_stats stats;
 	unsigned long my_pages;
 	int i, rv;
@@ -1218,9 +1218,9 @@ static int cluster_check_sync_size(struct mddev *mddev)
 {
 	int current_slot = md_cluster_ops->slot_number(mddev);
 	int node_num = mddev->bitmap_info.nodes;
-	struct bitmap *bitmap = mddev->bitmap;
 	struct dlm_lock_resource *bm_lockres;
 	struct md_bitmap_stats stats;
+	void *bitmap = mddev->bitmap;
 	unsigned long sync_size = 0;
 	unsigned long my_sync_size;
 	char str[64];
diff --git a/drivers/md/md.h b/drivers/md/md.h
index e56193f71ab4..1c6a5f41adca 100644
--- a/drivers/md/md.h
+++ b/drivers/md/md.h
@@ -535,7 +535,7 @@ struct mddev {
 	struct percpu_ref		writes_pending;
 	int				sync_checkers;	/* # of threads checking writes_pending */
 
-	struct bitmap			*bitmap; /* the bitmap for the device */
+	void				*bitmap; /* the bitmap for the device */
 	struct bitmap_operations	*bitmap_ops;
 	struct {
 		struct file		*file; /* the bitmap file */
diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index 52a707e39a4d..6093df281eb1 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -1425,7 +1425,6 @@ static void raid1_write_request(struct mddev *mddev, struct bio *bio,
 	struct r1conf *conf = mddev->private;
 	struct r1bio *r1_bio;
 	int i, disks;
-	struct bitmap *bitmap = mddev->bitmap;
 	unsigned long flags;
 	struct md_rdev *blocked_rdev;
 	int first_clone;
@@ -1578,7 +1577,7 @@ static void raid1_write_request(struct mddev *mddev, struct bio *bio,
 	 * at a time and thus needs a new bio that can fit the whole payload
 	 * this bio in page sized chunks.
 	 */
-	if (write_behind && bitmap)
+	if (write_behind && mddev->bitmap)
 		max_sectors = min_t(int, max_sectors,
 				    BIO_MAX_VECS * (PAGE_SIZE >> 9));
 	if (max_sectors < bio_sectors(bio)) {
@@ -1614,7 +1613,7 @@ static void raid1_write_request(struct mddev *mddev, struct bio *bio,
 			 * Not if there are too many, or cannot
 			 * allocate memory, or a reader on WriteMostly
 			 * is waiting for behind writes to flush */
-			err = mddev->bitmap_ops->get_stats(bitmap, &stats);
+			err = mddev->bitmap_ops->get_stats(mddev->bitmap, &stats);
 			if (!err && write_behind && !stats.behind_wait &&
 			    stats.behind_writes < max_write_behind)
 				alloc_behind_master_bio(r1_bio, bio);
-- 
2.39.2

Re: [PATCH md-6.12 00/41] md/md-bitmap: introduce bitmap_operations and make structure internel

[Paul Menzel]

Dear Yu,


Thank you for this patch series.


Am 22.08.24 um 04:46 schrieb Yu Kuai:
> From: Yu Kuai <yukuai3@huawei.com>
> 
> Changes from RFC v1:
>   - add patch 1-8 to prevent dereference bitmap directly, and the last
>   patch to make bitmap structure internel.
>   - use plain function alls "bitmap_ops->xxx()" directly;
> 
> Changes from RFC v2:
>   - some coding style.
> 
> The background is that currently bitmap is using a global spin_lock,
> cauing lock contention and huge IO performance degration for all raid

cau*s*ing
degra*da*tion

> levels.
> 
> However, it's impossible to implement a new lock free bitmap with
> current situation that md-bitmap exposes the internal implementation
> with lots of exported apis. Hence bitmap_operations is invented, to
> describe bitmap core implementation, and a new bitmap can be introduced
> with a new bitmap_operations, we only need to switch to the new one
> during initialization.
> 
> And with this we can build bitmap as kernel module, but that's not
> our concern for now.
> 
> This version was tested with mdadm tests. There are still few failed
> tests in my VM, howerver, it's the test itself need to be fixed and

however

> we're working on it.

It’d be great if you shared the benchmark data, and how this can be 
verified on other setups, so performance does not degrade on some sometimes.


Kind regards,

Paul


> Yu Kuai (41):
>    md/raid1: use md_bitmap_wait_behind_writes() in raid1_read_request()
>    md/md-bitmap: replace md_bitmap_status() with a new helper
>      md_bitmap_get_stats()
>    md: use new helper md_bitmap_get_stats() in update_array_info()
>    md/md-bitmap: add 'events_cleared' into struct md_bitmap_stats
>    md/md-bitmap: add 'sync_size' into struct md_bitmap_stats
>    md/md-bitmap: add 'file_pages' into struct md_bitmap_stats
>    md/md-bitmap: add 'behind_writes' and 'behind_wait' into struct
>      md_bitmap_stats
>    md/md-cluster: use helper md_bitmap_get_stats() to get pages in
>      resize_bitmaps()
>    md/md-bitmap: add a new helper md_bitmap_set_pages()
>    md/md-bitmap: introduce struct bitmap_operations
>    md/md-bitmap: simplify md_bitmap_create() + md_bitmap_load()
>    md/md-bitmap: merge md_bitmap_create() into bitmap_operations
>    md/md-bitmap: merge md_bitmap_load() into bitmap_operations
>    md/md-bitmap: merge md_bitmap_destroy() into bitmap_operations
>    md/md-bitmap: merge md_bitmap_flush() into bitmap_operations
>    md/md-bitmap: make md_bitmap_print_sb() internal
>    md/md-bitmap: merge md_bitmap_update_sb() into bitmap_operations
>    md/md-bitmap: merge md_bitmap_status() into bitmap_operations
>    md/md-bitmap: remove md_bitmap_setallbits()
>    md/md-bitmap: merge bitmap_write_all() into bitmap_operations
>    md/md-bitmap: merge md_bitmap_dirty_bits() into bitmap_operations
>    md/md-bitmap: merge md_bitmap_startwrite() into bitmap_operations
>    md/md-bitmap: merge md_bitmap_endwrite() into bitmap_operations
>    md/md-bitmap: merge md_bitmap_start_sync() into bitmap_operations
>    md/md-bitmap: remove the parameter 'aborted' for md_bitmap_end_sync()
>    md/md-bitmap: merge md_bitmap_end_sync() into bitmap_operations
>    md/md-bitmap: merge md_bitmap_close_sync() into bitmap_operations
>    md/md-bitmap: mrege md_bitmap_cond_end_sync() into bitmap_operations
>    md/md-bitmap: merge md_bitmap_sync_with_cluster() into
>      bitmap_operations
>    md/md-bitmap: merge md_bitmap_unplug_async() into md_bitmap_unplug()
>    md/md-bitmap: merge bitmap_unplug() into bitmap_operations
>    md/md-bitmap: merge md_bitmap_daemon_work() into bitmap_operations
>    md/md-bitmap: pass in mddev directly for md_bitmap_resize()
>    md/md-bitmap: merge md_bitmap_resize() into bitmap_operations
>    md/md-bitmap: merge get_bitmap_from_slot() into bitmap_operations
>    md/md-bitmap: merge md_bitmap_copy_from_slot() into struct
>      bitmap_operation.
>    md/md-bitmap: merge md_bitmap_set_pages() into struct
>      bitmap_operations
>    md/md-bitmap: merge md_bitmap_free() into bitmap_operations
>    md/md-bitmap: merge md_bitmap_wait_behind_writes() into
>      bitmap_operations
>    md/md-bitmap: merge md_bitmap_enabled() into bitmap_operations
>    md/md-bitmap: make in memory structure internal
> 
>   drivers/md/dm-raid.c     |   7 +-
>   drivers/md/md-bitmap.c   | 560 +++++++++++++++++++++++++++++----------
>   drivers/md/md-bitmap.h   | 268 ++++---------------
>   drivers/md/md-cluster.c  |  91 ++++---
>   drivers/md/md.c          | 155 +++++++----
>   drivers/md/md.h          |   3 +-
>   drivers/md/raid1-10.c    |   9 +-
>   drivers/md/raid1.c       |  78 +++---
>   drivers/md/raid10.c      |  73 ++---
>   drivers/md/raid5-cache.c |   8 +-
>   drivers/md/raid5.c       |  62 ++---
>   11 files changed, 752 insertions(+), 562 deletions(-)
> 

Re: [PATCH md-6.12 00/41] md/md-bitmap: introduce bitmap_operations and make structure internel

[Xiao Ni]

On Thu, Aug 22, 2024 at 10:52 AM Yu Kuai <yukuai1@huaweicloud.com> wrote:
>
> From: Yu Kuai <yukuai3@huawei.com>
>
> Changes from RFC v1:
>  - add patch 1-8 to prevent dereference bitmap directly, and the last
>  patch to make bitmap structure internel.
>  - use plain function alls "bitmap_ops->xxx()" directly;
>
> Changes from RFC v2:
>  - some coding style.
>
> The background is that currently bitmap is using a global spin_lock,
> cauing lock contention and huge IO performance degration for all raid
> levels.
>
> However, it's impossible to implement a new lock free bitmap with
> current situation that md-bitmap exposes the internal implementation
> with lots of exported apis. Hence bitmap_operations is invented, to
> describe bitmap core implementation, and a new bitmap can be introduced
> with a new bitmap_operations, we only need to switch to the new one
> during initialization.
>
> And with this we can build bitmap as kernel module, but that's not
> our concern for now.
>
> This version was tested with mdadm tests. There are still few failed
> tests in my VM, howerver, it's the test itself need to be fixed and
> we're working on it.

Hi Kuai

Do you run lvm2 test regression tests? It's better to run lvm2
regression tests for such a big change.

And by the way, does this patch set have a conflict with patch set
"[RFC V7] md/bitmap: Optimize lock contention". I haven't read the
patches, it's an optimization for the bitmap lock too.

Best Regards
Xiao
>
> Yu Kuai (41):
>   md/raid1: use md_bitmap_wait_behind_writes() in raid1_read_request()
>   md/md-bitmap: replace md_bitmap_status() with a new helper
>     md_bitmap_get_stats()
>   md: use new helper md_bitmap_get_stats() in update_array_info()
>   md/md-bitmap: add 'events_cleared' into struct md_bitmap_stats
>   md/md-bitmap: add 'sync_size' into struct md_bitmap_stats
>   md/md-bitmap: add 'file_pages' into struct md_bitmap_stats
>   md/md-bitmap: add 'behind_writes' and 'behind_wait' into struct
>     md_bitmap_stats
>   md/md-cluster: use helper md_bitmap_get_stats() to get pages in
>     resize_bitmaps()
>   md/md-bitmap: add a new helper md_bitmap_set_pages()
>   md/md-bitmap: introduce struct bitmap_operations
>   md/md-bitmap: simplify md_bitmap_create() + md_bitmap_load()
>   md/md-bitmap: merge md_bitmap_create() into bitmap_operations
>   md/md-bitmap: merge md_bitmap_load() into bitmap_operations
>   md/md-bitmap: merge md_bitmap_destroy() into bitmap_operations
>   md/md-bitmap: merge md_bitmap_flush() into bitmap_operations
>   md/md-bitmap: make md_bitmap_print_sb() internal
>   md/md-bitmap: merge md_bitmap_update_sb() into bitmap_operations
>   md/md-bitmap: merge md_bitmap_status() into bitmap_operations
>   md/md-bitmap: remove md_bitmap_setallbits()
>   md/md-bitmap: merge bitmap_write_all() into bitmap_operations
>   md/md-bitmap: merge md_bitmap_dirty_bits() into bitmap_operations
>   md/md-bitmap: merge md_bitmap_startwrite() into bitmap_operations
>   md/md-bitmap: merge md_bitmap_endwrite() into bitmap_operations
>   md/md-bitmap: merge md_bitmap_start_sync() into bitmap_operations
>   md/md-bitmap: remove the parameter 'aborted' for md_bitmap_end_sync()
>   md/md-bitmap: merge md_bitmap_end_sync() into bitmap_operations
>   md/md-bitmap: merge md_bitmap_close_sync() into bitmap_operations
>   md/md-bitmap: mrege md_bitmap_cond_end_sync() into bitmap_operations
>   md/md-bitmap: merge md_bitmap_sync_with_cluster() into
>     bitmap_operations
>   md/md-bitmap: merge md_bitmap_unplug_async() into md_bitmap_unplug()
>   md/md-bitmap: merge bitmap_unplug() into bitmap_operations
>   md/md-bitmap: merge md_bitmap_daemon_work() into bitmap_operations
>   md/md-bitmap: pass in mddev directly for md_bitmap_resize()
>   md/md-bitmap: merge md_bitmap_resize() into bitmap_operations
>   md/md-bitmap: merge get_bitmap_from_slot() into bitmap_operations
>   md/md-bitmap: merge md_bitmap_copy_from_slot() into struct
>     bitmap_operation.
>   md/md-bitmap: merge md_bitmap_set_pages() into struct
>     bitmap_operations
>   md/md-bitmap: merge md_bitmap_free() into bitmap_operations
>   md/md-bitmap: merge md_bitmap_wait_behind_writes() into
>     bitmap_operations
>   md/md-bitmap: merge md_bitmap_enabled() into bitmap_operations
>   md/md-bitmap: make in memory structure internal
>
>  drivers/md/dm-raid.c     |   7 +-
>  drivers/md/md-bitmap.c   | 560 +++++++++++++++++++++++++++++----------
>  drivers/md/md-bitmap.h   | 268 ++++---------------
>  drivers/md/md-cluster.c  |  91 ++++---
>  drivers/md/md.c          | 155 +++++++----
>  drivers/md/md.h          |   3 +-
>  drivers/md/raid1-10.c    |   9 +-
>  drivers/md/raid1.c       |  78 +++---
>  drivers/md/raid10.c      |  73 ++---
>  drivers/md/raid5-cache.c |   8 +-
>  drivers/md/raid5.c       |  62 ++---
>  11 files changed, 752 insertions(+), 562 deletions(-)
>
> --
> 2.39.2
>

Re: [PATCH md-6.12 05/41] md/md-bitmap: add 'sync_size' into struct md_bitmap_stats

[kernel test robot]

Hi Yu,

kernel test robot noticed the following build warnings:

[auto build test WARNING on device-mapper-dm/for-next]
[also build test WARNING on linus/master v6.11-rc4 next-20240822]
[cannot apply to song-md/md-next]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Yu-Kuai/md-raid1-use-md_bitmap_wait_behind_writes-in-raid1_read_request/20240822-110233
base:   https://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm.git for-next
patch link:    https://lore.kernel.org/r/20240822024718.2158259-6-yukuai1%40huaweicloud.com
patch subject: [PATCH md-6.12 05/41] md/md-bitmap: add 'sync_size' into struct md_bitmap_stats
config: x86_64-randconfig-121-20240822 (https://download.01.org/0day-ci/archive/20240823/202408230544.w18wb47U-lkp@intel.com/config)
compiler: clang version 18.1.5 (https://github.com/llvm/llvm-project 617a15a9eac96088ae5e9134248d8236e34b91b1)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240823/202408230544.w18wb47U-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202408230544.w18wb47U-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> drivers/md/md-bitmap.c:2106:26: sparse: sparse: incorrect type in assignment (different base types) @@     expected unsigned long sync_size @@     got restricted __le64 [usertype] sync_size @@
   drivers/md/md-bitmap.c:2106:26: sparse:     expected unsigned long sync_size
   drivers/md/md-bitmap.c:2106:26: sparse:     got restricted __le64 [usertype] sync_size
   drivers/md/md-bitmap.c: note: in included file (through include/linux/mmzone.h, include/linux/gfp.h, include/linux/xarray.h, ...):
   include/linux/page-flags.h:235:46: sparse: sparse: self-comparison always evaluates to false
   include/linux/page-flags.h:235:46: sparse: sparse: self-comparison always evaluates to false

vim +2106 drivers/md/md-bitmap.c

  2096	
  2097	int md_bitmap_get_stats(struct bitmap *bitmap, struct md_bitmap_stats *stats)
  2098	{
  2099		struct bitmap_counts *counts;
  2100		bitmap_super_t *sb;
  2101	
  2102		if (!bitmap)
  2103			return -ENOENT;
  2104	
  2105		sb = kmap_local_page(bitmap->storage.sb_page);
> 2106		stats->sync_size = sb->sync_size;
  2107		kunmap_local(sb);
  2108	
  2109		counts = &bitmap->counts;
  2110		stats->missing_pages = counts->missing_pages;
  2111		stats->pages = counts->pages;
  2112	
  2113		stats->events_cleared = bitmap->events_cleared;
  2114		stats->file = bitmap->storage.file;
  2115	
  2116		return 0;
  2117	}
  2118	EXPORT_SYMBOL_GPL(md_bitmap_get_stats);
  2119	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki

Re: [PATCH md-6.12 05/41] md/md-bitmap: add 'sync_size' into struct md_bitmap_stats

[Yu Kuai]

Hi,

在 2024/08/23 6:07, kernel test robot 写道:
> Hi Yu,
> 
> kernel test robot noticed the following build warnings:
> 
> [auto build test WARNING on device-mapper-dm/for-next]
> [also build test WARNING on linus/master v6.11-rc4 next-20240822]
> [cannot apply to song-md/md-next]
> [If your patch is applied to the wrong git tree, kindly drop us a note.
> And when submitting patch, we suggest to use '--base' as documented in
> https://git-scm.com/docs/git-format-patch#_base_tree_information]
> 
> url:    https://github.com/intel-lab-lkp/linux/commits/Yu-Kuai/md-raid1-use-md_bitmap_wait_behind_writes-in-raid1_read_request/20240822-110233
> base:   https://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm.git for-next
> patch link:    https://lore.kernel.org/r/20240822024718.2158259-6-yukuai1%40huaweicloud.com
> patch subject: [PATCH md-6.12 05/41] md/md-bitmap: add 'sync_size' into struct md_bitmap_stats
> config: x86_64-randconfig-121-20240822 (https://download.01.org/0day-ci/archive/20240823/202408230544.w18wb47U-lkp@intel.com/config)
> compiler: clang version 18.1.5 (https://github.com/llvm/llvm-project 617a15a9eac96088ae5e9134248d8236e34b91b1)
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240823/202408230544.w18wb47U-lkp@intel.com/reproduce)
> 
> If you fix the issue in a separate patch/commit (i.e. not just a new version of
> the same patch/commit), kindly add following tags
> | Reported-by: kernel test robot <lkp@intel.com>
> | Closes: https://lore.kernel.org/oe-kbuild-all/202408230544.w18wb47U-lkp@intel.com/
> 
> sparse warnings: (new ones prefixed by >>)
>>> drivers/md/md-bitmap.c:2106:26: sparse: sparse: incorrect type in assignment (different base types) @@     expected unsigned long sync_size @@     got restricted __le64 [usertype] sync_size @@
>     drivers/md/md-bitmap.c:2106:26: sparse:     expected unsigned long sync_size
>     drivers/md/md-bitmap.c:2106:26: sparse:     got restricted __le64 [usertype] sync_size

So this is actually the old code behavior. I'll fix this. :)

Thanks,
Kuai

>     drivers/md/md-bitmap.c: note: in included file (through include/linux/mmzone.h, include/linux/gfp.h, include/linux/xarray.h, ...):
>     include/linux/page-flags.h:235:46: sparse: sparse: self-comparison always evaluates to false
>     include/linux/page-flags.h:235:46: sparse: sparse: self-comparison always evaluates to false
> 
> vim +2106 drivers/md/md-bitmap.c
> 
>    2096	
>    2097	int md_bitmap_get_stats(struct bitmap *bitmap, struct md_bitmap_stats *stats)
>    2098	{
>    2099		struct bitmap_counts *counts;
>    2100		bitmap_super_t *sb;
>    2101	
>    2102		if (!bitmap)
>    2103			return -ENOENT;
>    2104	
>    2105		sb = kmap_local_page(bitmap->storage.sb_page);
>> 2106		stats->sync_size = sb->sync_size;
>    2107		kunmap_local(sb);
>    2108	
>    2109		counts = &bitmap->counts;
>    2110		stats->missing_pages = counts->missing_pages;
>    2111		stats->pages = counts->pages;
>    2112	
>    2113		stats->events_cleared = bitmap->events_cleared;
>    2114		stats->file = bitmap->storage.file;
>    2115	
>    2116		return 0;
>    2117	}
>    2118	EXPORT_SYMBOL_GPL(md_bitmap_get_stats);
>    2119	
> 

Re: [PATCH md-6.12 00/41] md/md-bitmap: introduce bitmap_operations and make structure internel

[Yu Kuai]

Hi,

在 2024/08/22 14:50, Paul Menzel 写道:
> Dear Yu,
> 
> 
> Thank you for this patch series.
> 
> 
> Am 22.08.24 um 04:46 schrieb Yu Kuai:
>> From: Yu Kuai <yukuai3@huawei.com>
>>
>> Changes from RFC v1:
>>   - add patch 1-8 to prevent dereference bitmap directly, and the last
>>   patch to make bitmap structure internel.
>>   - use plain function alls "bitmap_ops->xxx()" directly;
>>
>> Changes from RFC v2:
>>   - some coding style.
>>
>> The background is that currently bitmap is using a global spin_lock,
>> cauing lock contention and huge IO performance degration for all raid
> 
> cau*s*ing
> degra*da*tion
> 
>> levels.
>>
>> However, it's impossible to implement a new lock free bitmap with
>> current situation that md-bitmap exposes the internal implementation
>> with lots of exported apis. Hence bitmap_operations is invented, to
>> describe bitmap core implementation, and a new bitmap can be introduced
>> with a new bitmap_operations, we only need to switch to the new one
>> during initialization.
>>
>> And with this we can build bitmap as kernel module, but that's not
>> our concern for now.
>>
>> This version was tested with mdadm tests. There are still few failed
>> tests in my VM, howerver, it's the test itself need to be fixed and
> 
> however
> 
>> we're working on it.
> 
> It’d be great if you shared the benchmark data, and how this can be 
> verified on other setups, so performance does not degrade on some 
> sometimes.

Performance is not tested yet. Because this set doesn't have much
functional changes, jus some code cleanup.

Thanks,
Kuai

> 
> 
> Kind regards,
> 
> Paul
> 
> 
>> Yu Kuai (41):
>>    md/raid1: use md_bitmap_wait_behind_writes() in raid1_read_request()
>>    md/md-bitmap: replace md_bitmap_status() with a new helper
>>      md_bitmap_get_stats()
>>    md: use new helper md_bitmap_get_stats() in update_array_info()
>>    md/md-bitmap: add 'events_cleared' into struct md_bitmap_stats
>>    md/md-bitmap: add 'sync_size' into struct md_bitmap_stats
>>    md/md-bitmap: add 'file_pages' into struct md_bitmap_stats
>>    md/md-bitmap: add 'behind_writes' and 'behind_wait' into struct
>>      md_bitmap_stats
>>    md/md-cluster: use helper md_bitmap_get_stats() to get pages in
>>      resize_bitmaps()
>>    md/md-bitmap: add a new helper md_bitmap_set_pages()
>>    md/md-bitmap: introduce struct bitmap_operations
>>    md/md-bitmap: simplify md_bitmap_create() + md_bitmap_load()
>>    md/md-bitmap: merge md_bitmap_create() into bitmap_operations
>>    md/md-bitmap: merge md_bitmap_load() into bitmap_operations
>>    md/md-bitmap: merge md_bitmap_destroy() into bitmap_operations
>>    md/md-bitmap: merge md_bitmap_flush() into bitmap_operations
>>    md/md-bitmap: make md_bitmap_print_sb() internal
>>    md/md-bitmap: merge md_bitmap_update_sb() into bitmap_operations
>>    md/md-bitmap: merge md_bitmap_status() into bitmap_operations
>>    md/md-bitmap: remove md_bitmap_setallbits()
>>    md/md-bitmap: merge bitmap_write_all() into bitmap_operations
>>    md/md-bitmap: merge md_bitmap_dirty_bits() into bitmap_operations
>>    md/md-bitmap: merge md_bitmap_startwrite() into bitmap_operations
>>    md/md-bitmap: merge md_bitmap_endwrite() into bitmap_operations
>>    md/md-bitmap: merge md_bitmap_start_sync() into bitmap_operations
>>    md/md-bitmap: remove the parameter 'aborted' for md_bitmap_end_sync()
>>    md/md-bitmap: merge md_bitmap_end_sync() into bitmap_operations
>>    md/md-bitmap: merge md_bitmap_close_sync() into bitmap_operations
>>    md/md-bitmap: mrege md_bitmap_cond_end_sync() into bitmap_operations
>>    md/md-bitmap: merge md_bitmap_sync_with_cluster() into
>>      bitmap_operations
>>    md/md-bitmap: merge md_bitmap_unplug_async() into md_bitmap_unplug()
>>    md/md-bitmap: merge bitmap_unplug() into bitmap_operations
>>    md/md-bitmap: merge md_bitmap_daemon_work() into bitmap_operations
>>    md/md-bitmap: pass in mddev directly for md_bitmap_resize()
>>    md/md-bitmap: merge md_bitmap_resize() into bitmap_operations
>>    md/md-bitmap: merge get_bitmap_from_slot() into bitmap_operations
>>    md/md-bitmap: merge md_bitmap_copy_from_slot() into struct
>>      bitmap_operation.
>>    md/md-bitmap: merge md_bitmap_set_pages() into struct
>>      bitmap_operations
>>    md/md-bitmap: merge md_bitmap_free() into bitmap_operations
>>    md/md-bitmap: merge md_bitmap_wait_behind_writes() into
>>      bitmap_operations
>>    md/md-bitmap: merge md_bitmap_enabled() into bitmap_operations
>>    md/md-bitmap: make in memory structure internal
>>
>>   drivers/md/dm-raid.c     |   7 +-
>>   drivers/md/md-bitmap.c   | 560 +++++++++++++++++++++++++++++----------
>>   drivers/md/md-bitmap.h   | 268 ++++---------------
>>   drivers/md/md-cluster.c  |  91 ++++---
>>   drivers/md/md.c          | 155 +++++++----
>>   drivers/md/md.h          |   3 +-
>>   drivers/md/raid1-10.c    |   9 +-
>>   drivers/md/raid1.c       |  78 +++---
>>   drivers/md/raid10.c      |  73 ++---
>>   drivers/md/raid5-cache.c |   8 +-
>>   drivers/md/raid5.c       |  62 ++---
>>   11 files changed, 752 insertions(+), 562 deletions(-)
>>
> 
> .
> 

Re: [PATCH md-6.12 00/41] md/md-bitmap: introduce bitmap_operations and make structure internel

[Yu Kuai]

Hi,

在 2024/08/22 16:38, Xiao Ni 写道:
> On Thu, Aug 22, 2024 at 10:52 AM Yu Kuai <yukuai1@huaweicloud.com> wrote:
>>
>> From: Yu Kuai <yukuai3@huawei.com>
>>
>> Changes from RFC v1:
>>   - add patch 1-8 to prevent dereference bitmap directly, and the last
>>   patch to make bitmap structure internel.
>>   - use plain function alls "bitmap_ops->xxx()" directly;
>>
>> Changes from RFC v2:
>>   - some coding style.
>>
>> The background is that currently bitmap is using a global spin_lock,
>> cauing lock contention and huge IO performance degration for all raid
>> levels.
>>
>> However, it's impossible to implement a new lock free bitmap with
>> current situation that md-bitmap exposes the internal implementation
>> with lots of exported apis. Hence bitmap_operations is invented, to
>> describe bitmap core implementation, and a new bitmap can be introduced
>> with a new bitmap_operations, we only need to switch to the new one
>> during initialization.
>>
>> And with this we can build bitmap as kernel module, but that's not
>> our concern for now.
>>
>> This version was tested with mdadm tests. There are still few failed
>> tests in my VM, howerver, it's the test itself need to be fixed and
>> we're working on it.
> 
> Hi Kuai
> 
> Do you run lvm2 test regression tests? It's better to run lvm2
> regression tests for such a big change.

Not yet, again because there are not much functional changes. I can run
lvm2 test later.

> 
> And by the way, does this patch set have a conflict with patch set
> "[RFC V7] md/bitmap: Optimize lock contention". I haven't read the
> patches, it's an optimization for the bitmap lock too.

Of course there will be context conflict. After someone is applied, the
other one must rebase.

Thanks,
Kuai

> 
> Best Regards
> Xiao
>>
>> Yu Kuai (41):
>>    md/raid1: use md_bitmap_wait_behind_writes() in raid1_read_request()
>>    md/md-bitmap: replace md_bitmap_status() with a new helper
>>      md_bitmap_get_stats()
>>    md: use new helper md_bitmap_get_stats() in update_array_info()
>>    md/md-bitmap: add 'events_cleared' into struct md_bitmap_stats
>>    md/md-bitmap: add 'sync_size' into struct md_bitmap_stats
>>    md/md-bitmap: add 'file_pages' into struct md_bitmap_stats
>>    md/md-bitmap: add 'behind_writes' and 'behind_wait' into struct
>>      md_bitmap_stats
>>    md/md-cluster: use helper md_bitmap_get_stats() to get pages in
>>      resize_bitmaps()
>>    md/md-bitmap: add a new helper md_bitmap_set_pages()
>>    md/md-bitmap: introduce struct bitmap_operations
>>    md/md-bitmap: simplify md_bitmap_create() + md_bitmap_load()
>>    md/md-bitmap: merge md_bitmap_create() into bitmap_operations
>>    md/md-bitmap: merge md_bitmap_load() into bitmap_operations
>>    md/md-bitmap: merge md_bitmap_destroy() into bitmap_operations
>>    md/md-bitmap: merge md_bitmap_flush() into bitmap_operations
>>    md/md-bitmap: make md_bitmap_print_sb() internal
>>    md/md-bitmap: merge md_bitmap_update_sb() into bitmap_operations
>>    md/md-bitmap: merge md_bitmap_status() into bitmap_operations
>>    md/md-bitmap: remove md_bitmap_setallbits()
>>    md/md-bitmap: merge bitmap_write_all() into bitmap_operations
>>    md/md-bitmap: merge md_bitmap_dirty_bits() into bitmap_operations
>>    md/md-bitmap: merge md_bitmap_startwrite() into bitmap_operations
>>    md/md-bitmap: merge md_bitmap_endwrite() into bitmap_operations
>>    md/md-bitmap: merge md_bitmap_start_sync() into bitmap_operations
>>    md/md-bitmap: remove the parameter 'aborted' for md_bitmap_end_sync()
>>    md/md-bitmap: merge md_bitmap_end_sync() into bitmap_operations
>>    md/md-bitmap: merge md_bitmap_close_sync() into bitmap_operations
>>    md/md-bitmap: mrege md_bitmap_cond_end_sync() into bitmap_operations
>>    md/md-bitmap: merge md_bitmap_sync_with_cluster() into
>>      bitmap_operations
>>    md/md-bitmap: merge md_bitmap_unplug_async() into md_bitmap_unplug()
>>    md/md-bitmap: merge bitmap_unplug() into bitmap_operations
>>    md/md-bitmap: merge md_bitmap_daemon_work() into bitmap_operations
>>    md/md-bitmap: pass in mddev directly for md_bitmap_resize()
>>    md/md-bitmap: merge md_bitmap_resize() into bitmap_operations
>>    md/md-bitmap: merge get_bitmap_from_slot() into bitmap_operations
>>    md/md-bitmap: merge md_bitmap_copy_from_slot() into struct
>>      bitmap_operation.
>>    md/md-bitmap: merge md_bitmap_set_pages() into struct
>>      bitmap_operations
>>    md/md-bitmap: merge md_bitmap_free() into bitmap_operations
>>    md/md-bitmap: merge md_bitmap_wait_behind_writes() into
>>      bitmap_operations
>>    md/md-bitmap: merge md_bitmap_enabled() into bitmap_operations
>>    md/md-bitmap: make in memory structure internal
>>
>>   drivers/md/dm-raid.c     |   7 +-
>>   drivers/md/md-bitmap.c   | 560 +++++++++++++++++++++++++++++----------
>>   drivers/md/md-bitmap.h   | 268 ++++---------------
>>   drivers/md/md-cluster.c  |  91 ++++---
>>   drivers/md/md.c          | 155 +++++++----
>>   drivers/md/md.h          |   3 +-
>>   drivers/md/raid1-10.c    |   9 +-
>>   drivers/md/raid1.c       |  78 +++---
>>   drivers/md/raid10.c      |  73 ++---
>>   drivers/md/raid5-cache.c |   8 +-
>>   drivers/md/raid5.c       |  62 ++---
>>   11 files changed, 752 insertions(+), 562 deletions(-)
>>
>> --
>> 2.39.2
>>
> 
> 
> 
> .
>