[PATCH RFC v3 for-6.8/block 15/17] ext4: use new helper to read sb block

Yu Kuai
2023-12-21T09:01:01Z

From: Yu Kuai <yukuai3@huawei.com>

Remove __ext4_sb_bread_gfp() and ext4_buffer_uptodate() that is defined
by ext4, and convert to use common helper __bread_gfp2() and
buffer_uptodate_or_error().

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Reviewed-by: Jan Kara <jack@suse.cz>
---
fs/ext4/ext4.h | 13 -------------
fs/ext4/inode.c | 8 ++++----
fs/ext4/super.c | 45 ++++++++++-----------------------------------
fs/ext4/symlink.c | 2 +-
4 files changed, 15 insertions(+), 53 deletions(-)

diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index a5d784872303..8377f6c5264f 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -3824,19 +3824,6 @@ extern const struct iomap_ops ext4_iomap_ops;
extern const struct iomap_ops ext4_iomap_overwrite_ops;
extern const struct iomap_ops ext4_iomap_report_ops;

-static inline int ext4_buffer_uptodate(struct buffer_head *bh)
-{
- /*
- * If the buffer has the write error flag, we have failed
- * to write out data in the block. In this case, we don't
- * have to read the block because we may read the old data
- * successfully.
- */
- if (buffer_write_io_error(bh))
- set_buffer_uptodate(bh);
- return buffer_uptodate(bh);
-}
-
#endif /* __KERNEL__ */

#define EFSBADCRC EBADMSG /* Bad CRC detected */
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 61277f7f8722..efb0af6f02f7 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -887,7 +887,7 @@ struct buffer_head *ext4_bread(handle_t *handle, struct inode *inode,
bh = ext4_getblk(handle, inode, block, map_flags);
if (IS_ERR(bh))
return bh;
- if (!bh || ext4_buffer_uptodate(bh))
+ if (!bh || buffer_uptodate_or_error(bh))
return bh;

ret = ext4_read_bh_lock(bh, REQ_META | REQ_PRIO, true);
@@ -915,7 +915,7 @@ int ext4_bread_batch(struct inode *inode, ext4_lblk_t block, int bh_count,

for (i = 0; i < bh_count; i++)
/* Note that NULL bhs[i] is valid because of holes. */
- if (bhs[i] && !ext4_buffer_uptodate(bhs[i]))
+ if (bhs[i] && !buffer_uptodate_or_error(bhs[i]))
ext4_read_bh_lock(bhs[i], REQ_META | REQ_PRIO, false);

if (!wait)
@@ -4392,11 +4392,11 @@ static int __ext4_get_inode_loc(struct super_block *sb, unsigned long ino,
bh = sb_getblk(sb, block);
if (unlikely(!bh))
return -ENOMEM;
- if (ext4_buffer_uptodate(bh))
+ if (buffer_uptodate_or_error(bh))
goto has_buffer;

lock_buffer(bh);
- if (ext4_buffer_uptodate(bh)) {
+ if (buffer_uptodate_or_error(bh)) {
/* Someone brought it uptodate while we waited */
unlock_buffer(bh);
goto has_buffer;
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index c5fcf377ab1f..3f07eaa33332 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -180,7 +180,7 @@ void ext4_read_bh_nowait(struct buffer_head *bh, blk_opf_t op_flags,
{
BUG_ON(!buffer_locked(bh));

- if (ext4_buffer_uptodate(bh)) {
+ if (buffer_uptodate_or_error(bh)) {
unlock_buffer(bh);
return;
}
@@ -191,7 +191,7 @@ int ext4_read_bh(struct buffer_head *bh, blk_opf_t op_flags, bh_end_io_t *end_io
{
BUG_ON(!buffer_locked(bh));

- if (ext4_buffer_uptodate(bh)) {
+ if (buffer_uptodate_or_error(bh)) {
unlock_buffer(bh);
return 0;
}
@@ -214,49 +214,24 @@ int ext4_read_bh_lock(struct buffer_head *bh, blk_opf_t op_flags, bool wait)
return ext4_read_bh(bh, op_flags, NULL);
}

-/*
- * This works like __bread_gfp() except it uses ERR_PTR for error
- * returns. Currently with sb_bread it's impossible to distinguish
- * between ENOMEM and EIO situations (since both result in a NULL
- * return.
- */
-static struct buffer_head *__ext4_sb_bread_gfp(struct super_block *sb,
- sector_t block,
- blk_opf_t op_flags, gfp_t gfp)
-{
- struct buffer_head *bh;
- int ret;
-
- bh = sb_getblk_gfp(sb, block, gfp);
- if (bh == NULL)
- return ERR_PTR(-ENOMEM);
- if (ext4_buffer_uptodate(bh))
- return bh;
-
- ret = ext4_read_bh_lock(bh, REQ_META | op_flags, true);
- if (ret) {
- put_bh(bh);
- return ERR_PTR(ret);
- }
- return bh;
-}
-
struct buffer_head *ext4_sb_bread(struct super_block *sb, sector_t block,
blk_opf_t op_flags)
{
- gfp_t gfp = mapping_gfp_constraint(sb->s_bdev->bd_inode->i_mapping,
- ~__GFP_FS) | __GFP_MOVABLE;
+ struct buffer_head *bh = __bread_gfp2(sb->s_bdev, block,
+ sb->s_blocksize,
+ REQ_META | op_flags,
+ __GFP_MOVABLE);

- return __ext4_sb_bread_gfp(sb, block, op_flags, gfp);
+ return bh ? bh : ERR_PTR(-EIO);
}

struct buffer_head *ext4_sb_bread_unmovable(struct super_block *sb,
sector_t block)
{
- gfp_t gfp = mapping_gfp_constraint(sb->s_bdev->bd_inode->i_mapping,
- ~__GFP_FS);
+ struct buffer_head *bh = __bread_gfp2(sb->s_bdev, block,
+ sb->s_blocksize, REQ_META, 0);

- return __ext4_sb_bread_gfp(sb, block, 0, gfp);
+ return bh ? bh : ERR_PTR(-EIO);
}

void ext4_sb_breadahead_unmovable(struct super_block *sb, sector_t block)
diff --git a/fs/ext4/symlink.c b/fs/ext4/symlink.c
index 75bf1f88843c..49e918221aac 100644
--- a/fs/ext4/symlink.c
+++ b/fs/ext4/symlink.c
@@ -94,7 +94,7 @@ static const char *ext4_get_link(struct dentry *dentry, struct inode *inode,
bh = ext4_getblk(NULL, inode, 0, EXT4_GET_BLOCKS_CACHED_NOWAIT);
if (IS_ERR(bh))
return ERR_CAST(bh);
- if (!bh || !ext4_buffer_uptodate(bh))
+ if (!bh || !buffer_uptodate_or_error(bh))
return ERR_PTR(-ECHILD);
} else {
bh = ext4_bread(NULL, inode, 0, 0);
--
2.39.2