[PATCH] ext4: remove the redundant folio_wait_stable()

[PATCH] ext4: remove the redundant folio_wait_stable()

[Zhang Yi]

From: Zhang Yi <yi.zhang@huawei.com>

__filemap_get_folio() with FGP_WRITEBEGIN parameter has already wait
for stable folio, so remove the redundant folio_wait_stable() in
ext4_da_write_begin(), it was left over from the commit cc883236b792
("ext4: drop unnecessary journal handle in delalloc write") that
removed the retry getting page logic.

Fixes: cc883236b792 ("ext4: drop unnecessary journal handle in delalloc write")
Signed-off-by: Zhang Yi <yi.zhang@huawei.com>
---
 fs/ext4/inode.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 537803250ca9..6de6bf57699b 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -2887,9 +2887,6 @@ static int ext4_da_write_begin(struct file *file, struct address_space *mapping,
 	if (IS_ERR(folio))
 		return PTR_ERR(folio);
 
-	/* In case writeback began while the folio was unlocked */
-	folio_wait_stable(folio);
-
 #ifdef CONFIG_FS_ENCRYPTION
 	ret = ext4_block_write_begin(folio, pos, len, ext4_da_get_block_prep);
 #else
-- 
2.39.2

Re: [PATCH] ext4: remove the redundant folio_wait_stable()

[Jan Kara]

On Fri 19-04-24 10:30:05, Zhang Yi wrote:
> From: Zhang Yi <yi.zhang@huawei.com>
> 
> __filemap_get_folio() with FGP_WRITEBEGIN parameter has already wait
> for stable folio, so remove the redundant folio_wait_stable() in
> ext4_da_write_begin(), it was left over from the commit cc883236b792
> ("ext4: drop unnecessary journal handle in delalloc write") that
> removed the retry getting page logic.
> 
> Fixes: cc883236b792 ("ext4: drop unnecessary journal handle in delalloc write")
> Signed-off-by: Zhang Yi <yi.zhang@huawei.com>

Looks good. Feel free to add:

Reviewed-by: Jan Kara <jack@suse.cz>

								Honza

> ---
>  fs/ext4/inode.c | 3 ---
>  1 file changed, 3 deletions(-)
> 
> diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
> index 537803250ca9..6de6bf57699b 100644
> --- a/fs/ext4/inode.c
> +++ b/fs/ext4/inode.c
> @@ -2887,9 +2887,6 @@ static int ext4_da_write_begin(struct file *file, struct address_space *mapping,
>  	if (IS_ERR(folio))
>  		return PTR_ERR(folio);
>  
> -	/* In case writeback began while the folio was unlocked */
> -	folio_wait_stable(folio);
> -
>  #ifdef CONFIG_FS_ENCRYPTION
>  	ret = ext4_block_write_begin(folio, pos, len, ext4_da_get_block_prep);
>  #else
> -- 
> 2.39.2
> 
-- 
Jan Kara <jack@suse.com>
SUSE Labs, CR

Re: [PATCH] ext4: remove the redundant folio_wait_stable()

[Theodore Ts'o]

On Fri, 19 Apr 2024 10:30:05 +0800, Zhang Yi wrote:
> __filemap_get_folio() with FGP_WRITEBEGIN parameter has already wait
> for stable folio, so remove the redundant folio_wait_stable() in
> ext4_da_write_begin(), it was left over from the commit cc883236b792
> ("ext4: drop unnecessary journal handle in delalloc write") that
> removed the retry getting page logic.
> 
> 
> [...]

Applied, thanks!

[1/1] ext4: remove the redundant folio_wait_stable()
      commit: df0b5afc62f3368d657a8fe4a8d393ac481474c2

Best regards,
-- 
Theodore Ts'o <tytso@mit.edu>