[PATCH 08/29] dax: remove dax_capable

Christoph Hellwig
2021-11-09T08:33:37Z

Just open code the block size and dax_dev == NULL checks in the callers.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Mike Snitzer <snitzer@redhat.com>
---
drivers/dax/super.c | 36 ------------------------------------
drivers/md/dm-table.c | 22 +++++++++++-----------
drivers/md/dm.c | 21 ---------------------
drivers/md/dm.h | 4 ----
drivers/nvdimm/pmem.c | 1 -
drivers/s390/block/dcssblk.c | 1 -
fs/erofs/super.c | 11 +++++++----
fs/ext2/super.c | 6 ++++--
fs/ext4/super.c | 9 ++++++---
fs/xfs/xfs_super.c | 21 ++++++++-------------
include/linux/dax.h | 14 --------------
11 files changed, 36 insertions(+), 110 deletions(-)

diff --git a/drivers/dax/super.c b/drivers/dax/super.c
index 482fe775324a4..803942586d1b6 100644
--- a/drivers/dax/super.c
+++ b/drivers/dax/super.c
@@ -108,42 +108,6 @@ struct dax_device *fs_dax_get_by_bdev(struct block_device *bdev)
return dax_dev;
}
EXPORT_SYMBOL_GPL(fs_dax_get_by_bdev);
-
-bool generic_fsdax_supported(struct dax_device *dax_dev,
- struct block_device *bdev, int blocksize, sector_t start,
- sector_t sectors)
-{
- if (blocksize != PAGE_SIZE) {
- pr_info("%pg: error: unsupported blocksize for dax\n", bdev);
- return false;
- }
-
- if (!dax_dev) {
- pr_debug("%pg: error: dax unsupported by block device\n", bdev);
- return false;
- }
-
- return true;
-}
-EXPORT_SYMBOL_GPL(generic_fsdax_supported);
-
-bool dax_supported(struct dax_device *dax_dev, struct block_device *bdev,
- int blocksize, sector_t start, sector_t len)
-{
- bool ret = false;
- int id;
-
- if (!dax_dev)
- return false;
-
- id = dax_read_lock();
- if (dax_alive(dax_dev) && dax_dev->ops->dax_supported)
- ret = dax_dev->ops->dax_supported(dax_dev, bdev, blocksize,
- start, len);
- dax_read_unlock(id);
- return ret;
-}
-EXPORT_SYMBOL_GPL(dax_supported);
#endif /* CONFIG_BLOCK && CONFIG_FS_DAX */

enum dax_device_flags {
diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
index bcddc5effd155..f4915a7d5dc84 100644
--- a/drivers/md/dm-table.c
+++ b/drivers/md/dm-table.c
@@ -806,12 +806,14 @@ void dm_table_set_type(struct dm_table *t, enum dm_queue_mode type)
EXPORT_SYMBOL_GPL(dm_table_set_type);

/* validate the dax capability of the target device span */
-int device_not_dax_capable(struct dm_target *ti, struct dm_dev *dev,
+static int device_not_dax_capable(struct dm_target *ti, struct dm_dev *dev,
sector_t start, sector_t len, void *data)
{
- int blocksize = *(int *) data;
+ if (dev->dax_dev)
+ return false;

- return !dax_supported(dev->dax_dev, dev->bdev, blocksize, start, len);
+ DMDEBUG("%pg: error: dax unsupported by block device", dev->bdev);
+ return true;
}

/* Check devices support synchronous DAX */
@@ -821,8 +823,8 @@ static int device_not_dax_synchronous_capable(struct dm_target *ti, struct dm_de
return !dev->dax_dev || !dax_synchronous(dev->dax_dev);
}

-bool dm_table_supports_dax(struct dm_table *t,
- iterate_devices_callout_fn iterate_fn, int *blocksize)
+static bool dm_table_supports_dax(struct dm_table *t,
+ iterate_devices_callout_fn iterate_fn)
{
struct dm_target *ti;
unsigned i;
@@ -835,7 +837,7 @@ bool dm_table_supports_dax(struct dm_table *t,
return false;

if (!ti->type->iterate_devices ||
- ti->type->iterate_devices(ti, iterate_fn, blocksize))
+ ti->type->iterate_devices(ti, iterate_fn, NULL))
return false;
}

@@ -862,7 +864,6 @@ static int dm_table_determine_type(struct dm_table *t)
struct dm_target *tgt;
struct list_head *devices = dm_table_get_devices(t);
enum dm_queue_mode live_md_type = dm_get_md_type(t->md);
- int page_size = PAGE_SIZE;

if (t->type != DM_TYPE_NONE) {
/* target already set the table's type */
@@ -906,7 +907,7 @@ static int dm_table_determine_type(struct dm_table *t)
verify_bio_based:
/* We must use this table as bio-based */
t->type = DM_TYPE_BIO_BASED;
- if (dm_table_supports_dax(t, device_not_dax_capable, &page_size) ||
+ if (dm_table_supports_dax(t, device_not_dax_capable) ||
(list_empty(devices) && live_md_type == DM_TYPE_DAX_BIO_BASED)) {
t->type = DM_TYPE_DAX_BIO_BASED;
}
@@ -1976,7 +1977,6 @@ int dm_table_set_restrictions(struct dm_table *t, struct request_queue *q,
struct queue_limits *limits)
{
bool wc = false, fua = false;
- int page_size = PAGE_SIZE;
int r;

/*
@@ -2010,9 +2010,9 @@ int dm_table_set_restrictions(struct dm_table *t, struct request_queue *q,
}
blk_queue_write_cache(q, wc, fua);

- if (dm_table_supports_dax(t, device_not_dax_capable, &page_size)) {
+ if (dm_table_supports_dax(t, device_not_dax_capable)) {
blk_queue_flag_set(QUEUE_FLAG_DAX, q);
- if (dm_table_supports_dax(t, device_not_dax_synchronous_capable, NULL))
+ if (dm_table_supports_dax(t, device_not_dax_synchronous_capable))
set_dax_synchronous(t->md->dax_dev);
}
else
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 782a076f61f81..282008afc465f 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -1027,26 +1027,6 @@ static long dm_dax_direct_access(struct dax_device *dax_dev, pgoff_t pgoff,
return ret;
}

-static bool dm_dax_supported(struct dax_device *dax_dev, struct block_device *bdev,
- int blocksize, sector_t start, sector_t len)
-{
- struct mapped_device *md = dax_get_private(dax_dev);
- struct dm_table *map;
- bool ret = false;
- int srcu_idx;
-
- map = dm_get_live_table(md, &srcu_idx);
- if (!map)
- goto out;
-
- ret = dm_table_supports_dax(map, device_not_dax_capable, &blocksize);
-
-out:
- dm_put_live_table(md, srcu_idx);
-
- return ret;
-}
-
static size_t dm_dax_copy_from_iter(struct dax_device *dax_dev, pgoff_t pgoff,
void *addr, size_t bytes, struct iov_iter *i)
{
@@ -3052,7 +3032,6 @@ static const struct block_device_operations dm_rq_blk_dops = {

static const struct dax_operations dm_dax_ops = {
.direct_access = dm_dax_direct_access,
- .dax_supported = dm_dax_supported,
.copy_from_iter = dm_dax_copy_from_iter,
.copy_to_iter = dm_dax_copy_to_iter,
.zero_page_range = dm_dax_zero_page_range,
diff --git a/drivers/md/dm.h b/drivers/md/dm.h
index 742d9c80efe19..9013dc1a7b002 100644
--- a/drivers/md/dm.h
+++ b/drivers/md/dm.h
@@ -73,10 +73,6 @@ bool dm_table_bio_based(struct dm_table *t);
bool dm_table_request_based(struct dm_table *t);
void dm_table_free_md_mempools(struct dm_table *t);
struct dm_md_mempools *dm_table_get_md_mempools(struct dm_table *t);
-bool dm_table_supports_dax(struct dm_table *t, iterate_devices_callout_fn fn,
- int *blocksize);
-int device_not_dax_capable(struct dm_target *ti, struct dm_dev *dev,
- sector_t start, sector_t len, void *data);

void dm_lock_md_type(struct mapped_device *md);
void dm_unlock_md_type(struct mapped_device *md);
diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c
index 8783ad7370856..0d66339875523 100644
--- a/drivers/nvdimm/pmem.c
+++ b/drivers/nvdimm/pmem.c
@@ -321,7 +321,6 @@ static size_t pmem_copy_to_iter(struct dax_device *dax_dev, pgoff_t pgoff,

static const struct dax_operations pmem_dax_ops = {
.direct_access = pmem_dax_direct_access,
- .dax_supported = generic_fsdax_supported,
.copy_from_iter = pmem_copy_from_iter,
.copy_to_iter = pmem_copy_to_iter,
.zero_page_range = pmem_dax_zero_page_range,
diff --git a/drivers/s390/block/dcssblk.c b/drivers/s390/block/dcssblk.c
index 657e492f2bc26..e65e83764d1ce 100644
--- a/drivers/s390/block/dcssblk.c
+++ b/drivers/s390/block/dcssblk.c
@@ -72,7 +72,6 @@ static int dcssblk_dax_zero_page_range(struct dax_device *dax_dev,

static const struct dax_operations dcssblk_dax_ops = {
.direct_access = dcssblk_dax_direct_access,
- .dax_supported = generic_fsdax_supported,
.copy_from_iter = dcssblk_dax_copy_from_iter,
.copy_to_iter = dcssblk_dax_copy_to_iter,
.zero_page_range = dcssblk_dax_zero_page_range,
diff --git a/fs/erofs/super.c b/fs/erofs/super.c
index 6a969b1e0ee6b..0aed886473c8d 100644
--- a/fs/erofs/super.c
+++ b/fs/erofs/super.c
@@ -652,10 +652,13 @@ static int erofs_fc_fill_super(struct super_block *sb, struct fs_context *fc)
if (err)
return err;

- if (test_opt(&sbi->opt, DAX_ALWAYS) &&
- !dax_supported(sbi->dax_dev, sb->s_bdev, EROFS_BLKSIZ, 0, bdev_nr_sectors(sb->s_bdev))) {
- errorfc(fc, "DAX unsupported by block device. Turning off DAX.");
- clear_opt(&sbi->opt, DAX_ALWAYS);
+ if (test_opt(&sbi->opt, DAX_ALWAYS)) {
+ BUILD_BUG_ON(EROFS_BLKSIZ != PAGE_SIZE);
+
+ if (!sbi->dax_dev) {
+ errorfc(fc, "DAX unsupported by block device. Turning off DAX.");
+ clear_opt(&sbi->opt, DAX_ALWAYS);
+ }
}
sb->s_flags |= SB_RDONLY | SB_NOATIME;
sb->s_maxbytes = MAX_LFS_FILESIZE;
diff --git a/fs/ext2/super.c b/fs/ext2/super.c
index d8d580b609baa..a964066a80aa7 100644
--- a/fs/ext2/super.c
+++ b/fs/ext2/super.c
@@ -946,11 +946,13 @@ static int ext2_fill_super(struct super_block *sb, void *data, int silent)
blocksize = BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);

if (test_opt(sb, DAX)) {
- if (!dax_supported(dax_dev, sb->s_bdev, blocksize, 0,
- bdev_nr_sectors(sb->s_bdev))) {
+ if (!dax_dev) {
ext2_msg(sb, KERN_ERR,
"DAX unsupported by block device. Turning off DAX.");
clear_opt(sbi->s_mount_opt, DAX);
+ } else if (blocksize != PAGE_SIZE) {
+ ext2_msg(sb, KERN_ERR, "unsupported blocksize for DAX\n");
+ clear_opt(sbi->s_mount_opt, DAX);
}
}

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index a320c54202d95..eb4df43abd76e 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -4300,9 +4300,12 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
goto failed_mount;
}

- if (dax_supported(dax_dev, sb->s_bdev, blocksize, 0,
- bdev_nr_sectors(sb->s_bdev)))
- set_bit(EXT4_FLAGS_BDEV_IS_DAX, &sbi->s_ext4_flags);
+ if (dax_dev) {
+ if (blocksize == PAGE_SIZE)
+ set_bit(EXT4_FLAGS_BDEV_IS_DAX, &sbi->s_ext4_flags);
+ else
+ ext4_msg(sb, KERN_ERR, "unsupported blocksize for DAX\n");
+ }

if (sbi->s_mount_opt & EXT4_MOUNT_DAX_ALWAYS) {
if (ext4_has_feature_inline_data(sb)) {
diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c
index 875fd3151d6c9..3a45d5caa28d5 100644
--- a/fs/xfs/xfs_super.c
+++ b/fs/xfs/xfs_super.c
@@ -331,28 +331,23 @@ xfs_set_inode_alloc(
return xfs_is_inode32(mp) ? maxagi : agcount;
}

-static bool
-xfs_buftarg_is_dax(
- struct super_block *sb,
- struct xfs_buftarg *bt)
-{
- return dax_supported(bt->bt_daxdev, bt->bt_bdev, sb->s_blocksize, 0,
- bdev_nr_sectors(bt->bt_bdev));
-}
-
static int
xfs_setup_dax_always(
struct xfs_mount *mp)
{
- struct super_block *sb = mp->m_super;
-
- if (!xfs_buftarg_is_dax(sb, mp->m_ddev_targp) &&
- (!mp->m_rtdev_targp || !xfs_buftarg_is_dax(sb, mp->m_rtdev_targp))) {
+ if (!mp->m_ddev_targp->bt_daxdev &&
+ (!mp->m_rtdev_targp || !mp->m_rtdev_targp->bt_daxdev)) {
xfs_alert(mp,
"DAX unsupported by block device. Turning off DAX.");
goto disable_dax;
}

+ if (mp->m_super->s_blocksize != PAGE_SIZE) {
+ xfs_alert(mp,
+ "DAX not supported for blocksize. Turning off DAX.\n");
+ goto disable_dax;
+ }
+
if (xfs_has_reflink(mp)) {
xfs_alert(mp, "DAX and reflink cannot be used together!");
return -EINVAL;
diff --git a/include/linux/dax.h b/include/linux/dax.h
index e2e9a67004cbd..439c3c70e347b 100644
--- a/include/linux/dax.h
+++ b/include/linux/dax.h
@@ -111,12 +111,6 @@ int bdev_dax_pgoff(struct block_device *, sector_t, size_t, pgoff_t *pgoff);
#if IS_ENABLED(CONFIG_FS_DAX)
int dax_add_host(struct dax_device *dax_dev, struct gendisk *disk);
void dax_remove_host(struct gendisk *disk);
-bool generic_fsdax_supported(struct dax_device *dax_dev,
- struct block_device *bdev, int blocksize, sector_t start,
- sector_t sectors);
-
-bool dax_supported(struct dax_device *dax_dev, struct block_device *bdev,
- int blocksize, sector_t start, sector_t len);

static inline void fs_put_dax(struct dax_device *dax_dev)
{
@@ -139,14 +133,6 @@ static inline int dax_add_host(struct dax_device *dax_dev, struct gendisk *disk)
static inline void dax_remove_host(struct gendisk *disk)
{
}
-#define generic_fsdax_supported NULL
-
-static inline bool dax_supported(struct dax_device *dax_dev,
- struct block_device *bdev, int blocksize, sector_t start,
- sector_t len)
-{
- return false;
-}

static inline void fs_put_dax(struct dax_device *dax_dev)
{
--
2.30.2