[PATCH 01/14] block: move the NEED_PART_SCAN flag to struct gendisk

Christoph Hellwig
2020-09-21T07:20:03Z

We can only scan for partitions on the whole disk, so move the flag
from struct block_device to struct gendisk.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
block/genhd.c | 4 ++--
drivers/block/nbd.c | 8 ++++----
drivers/ide/ide-gd.c | 2 +-
fs/block_dev.c | 7 +++----
include/linux/blk_types.h | 4 +---
include/linux/genhd.h | 2 ++
6 files changed, 13 insertions(+), 14 deletions(-)

diff --git a/block/genhd.c b/block/genhd.c
index 9d060e79eb31d8..7b56203c90a303 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -731,7 +731,7 @@ static void register_disk(struct device *parent, struct gendisk *disk,
if (!bdev)
goto exit;

- set_bit(BDEV_NEED_PART_SCAN, &bdev->bd_flags);
+ set_bit(GD_NEED_PART_SCAN, &disk->state);
err = blkdev_get(bdev, FMODE_READ, NULL);
if (err < 0)
goto exit;
@@ -2112,7 +2112,7 @@ bool bdev_check_media_change(struct block_device *bdev)
if (__invalidate_device(bdev, true))
pr_warn("VFS: busy inodes on changed media %s\n",
bdev->bd_disk->disk_name);
- set_bit(BDEV_NEED_PART_SCAN, &bdev->bd_flags);
+ set_bit(GD_NEED_PART_SCAN, &bdev->bd_disk->state);
return true;
}
EXPORT_SYMBOL(bdev_check_media_change);
diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c
index 15eed210feeff4..2dca0aab0a9a25 100644
--- a/drivers/block/nbd.c
+++ b/drivers/block/nbd.c
@@ -315,7 +315,7 @@ static void nbd_size_update(struct nbd_device *nbd)
bd_set_nr_sectors(bdev, nr_sectors);
set_blocksize(bdev, config->blksize);
} else
- set_bit(BDEV_NEED_PART_SCAN, &bdev->bd_flags);
+ set_bit(GD_NEED_PART_SCAN, &nbd->disk->state);
bdput(bdev);
}
kobject_uevent(&nbd_to_dev(nbd)->kobj, KOBJ_CHANGE);
@@ -1322,7 +1322,7 @@ static int nbd_start_device_ioctl(struct nbd_device *nbd, struct block_device *b
return ret;

if (max_part)
- set_bit(BDEV_NEED_PART_SCAN, &bdev->bd_flags);
+ set_bit(GD_NEED_PART_SCAN, &nbd->disk->state);
mutex_unlock(&nbd->config_lock);
ret = wait_event_interruptible(config->recv_wq,
atomic_read(&config->recv_threads) == 0);
@@ -1500,9 +1500,9 @@ static int nbd_open(struct block_device *bdev, fmode_t mode)
refcount_set(&nbd->config_refs, 1);
refcount_inc(&nbd->refs);
mutex_unlock(&nbd->config_lock);
- set_bit(BDEV_NEED_PART_SCAN, &bdev->bd_flags);
+ set_bit(GD_NEED_PART_SCAN, &bdev->bd_disk->state);
} else if (nbd_disconnected(nbd->config)) {
- set_bit(BDEV_NEED_PART_SCAN, &bdev->bd_flags);
+ set_bit(GD_NEED_PART_SCAN, &bdev->bd_disk->state);
}
out:
mutex_unlock(&nbd_index_mutex);
diff --git a/drivers/ide/ide-gd.c b/drivers/ide/ide-gd.c
index 661e2aa9c96784..e2b6c82586ce8b 100644
--- a/drivers/ide/ide-gd.c
+++ b/drivers/ide/ide-gd.c
@@ -230,7 +230,7 @@ static int ide_gd_open(struct block_device *bdev, fmode_t mode)
bdev->bd_disk->disk_name);
drive->disk_ops->get_capacity(drive);
set_capacity(disk, ide_gd_capacity(drive));
- set_bit(BDEV_NEED_PART_SCAN, &bdev->bd_flags);
+ set_bit(GD_NEED_PART_SCAN, &disk->state);
} else if (drive->dev_flags & IDE_DFLAG_FORMAT_IN_PROGRESS) {
ret = -EBUSY;
goto out_put_idkp;
diff --git a/fs/block_dev.c b/fs/block_dev.c
index 0b34955b9e360f..1a9325f4315769 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -910,7 +910,6 @@ struct block_device *bdget(dev_t dev)
bdev->bd_super = NULL;
bdev->bd_inode = inode;
bdev->bd_part_count = 0;
- bdev->bd_flags = 0;
inode->i_mode = S_IFBLK;
inode->i_rdev = dev;
inode->i_bdev = bdev;
@@ -1385,7 +1384,7 @@ int bdev_disk_changed(struct block_device *bdev, bool invalidate)

lockdep_assert_held(&bdev->bd_mutex);

- clear_bit(BDEV_NEED_PART_SCAN, &bdev->bd_flags);
+ clear_bit(GD_NEED_PART_SCAN, &bdev->bd_disk->state);

rescan:
ret = blk_drop_partitions(bdev);
@@ -1509,7 +1508,7 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, void *holder,
* The latter is necessary to prevent ghost
* partitions on a removed medium.
*/
- if (test_bit(BDEV_NEED_PART_SCAN, &bdev->bd_flags) &&
+ if (test_bit(GD_NEED_PART_SCAN, &disk->state) &&
(!ret || ret == -ENOMEDIUM))
bdev_disk_changed(bdev, ret == -ENOMEDIUM);

@@ -1539,7 +1538,7 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, void *holder,
if (bdev->bd_disk->fops->open)
ret = bdev->bd_disk->fops->open(bdev, mode);
/* the same as first opener case, read comment there */
- if (test_bit(BDEV_NEED_PART_SCAN, &bdev->bd_flags) &&
+ if (test_bit(GD_NEED_PART_SCAN, &disk->state) &&
(!ret || ret == -ENOMEDIUM))
bdev_disk_changed(bdev, ret == -ENOMEDIUM);
if (ret)
diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h
index 6ffa783e16335e..eb20e28184ab19 100644
--- a/include/linux/blk_types.h
+++ b/include/linux/blk_types.h
@@ -19,8 +19,6 @@ struct cgroup_subsys_state;
typedef void (bio_end_io_t) (struct bio *);
struct bio_crypt_ctx;

-#define BDEV_NEED_PART_SCAN 0
-
struct block_device {
dev_t bd_dev;
int bd_openers;
@@ -39,7 +37,7 @@ struct block_device {
struct hd_struct * bd_part;
/* number of times partitions within this device have been opened. */
unsigned bd_part_count;
- unsigned long bd_flags;
+
spinlock_t bd_size_lock; /* for bd_inode->i_size updates */
struct gendisk * bd_disk;
struct backing_dev_info *bd_bdi;
diff --git a/include/linux/genhd.h b/include/linux/genhd.h
index 1c97cf84f011a7..38f23d75701379 100644
--- a/include/linux/genhd.h
+++ b/include/linux/genhd.h
@@ -191,6 +191,8 @@ struct gendisk {
void *private_data;

int flags;
+ unsigned long state;
+#define GD_NEED_PART_SCAN 0
struct rw_semaphore lookup_sem;
struct kobject *slave_dir;

--
2.28.0