2014-04-09 09:46:07

by Younger Liu

Subject: [PATCH] ext4: return ENOMEM rather than EIO when find_###_page() fails

Return ENOMEM rather than EIO when find_get_page() fails in
ext4_mb_get_buddy_page_lock() and find_or_create_page() fails in
ext4_mb_load_buddy().

Signed-off-by: Younger Liu <[email protected]>
---
fs/ext4/mballoc.c | 16 ++++++++++++----
1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index a888cac..73ccbb3 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -989,7 +989,7 @@ static int ext4_mb_get_buddy_page_lock(struct super_block *sb,
poff = block % blocks_per_page;
page = find_or_create_page(inode->i_mapping, pnum, GFP_NOFS);
if (!page)
- return -EIO;
+ return -ENOMEM;
BUG_ON(page->mapping != inode->i_mapping);
e4b->bd_bitmap_page = page;
e4b->bd_bitmap = page_address(page) + (poff * sb->s_blocksize);
@@ -1003,7 +1003,7 @@ static int ext4_mb_get_buddy_page_lock(struct super_block *sb,
pnum = block / blocks_per_page;
page = find_or_create_page(inode->i_mapping, pnum, GFP_NOFS);
if (!page)
- return -EIO;
+ return -ENOMEM;
BUG_ON(page->mapping != inode->i_mapping);
e4b->bd_buddy_page = page;
return 0;
@@ -1168,7 +1168,11 @@ ext4_mb_load_buddy(struct super_block *sb, ext4_group_t group,
unlock_page(page);
}
}
- if (page == NULL || !PageUptodate(page)) {
+ if (page == NULL) {
+ ret = -ENOMEM;
+ goto err;
+ }
+ if (!PageUptodate(page)) {
ret = -EIO;
goto err;
}
@@ -1197,7 +1201,11 @@ ext4_mb_load_buddy(struct super_block *sb, ext4_group_t group,
unlock_page(page);
}
}
- if (page == NULL || !PageUptodate(page)) {
+ if (page == NULL) {
+ ret = -ENOMEM;
+ goto err;
+ }
+ if (!PageUptodate(page)) {
ret = -EIO;
goto err;
}
--
1.7.9.5

2014-04-11 03:05:47

by Theodore Ts'o

Subject: Re: [PATCH] ext4: return ENOMEM rather than EIO when find_###_page() fails

On Wed, Apr 09, 2014 at 05:46:00PM +0800, Younger Liu wrote:
>
> Return ENOMEM rather than EIO when find_get_page() fails in
> ext4_mb_get_buddy_page_lock() and find_or_create_page() fails in
> ext4_mb_load_buddy().
>
> Signed-off-by: Younger Liu <[email protected]>

Thanks, applied.

- Ted