2007-01-24 03:50:48

by Andrew Morton

[permalink] [raw]
Subject: + return-enoent-from-ext3_link-when-racing-with-unlink.patch added to -mm tree

The patch titled
return ENOENT from ext3_link when racing with unlink
has been added to the -mm tree. Its filename is

*** Remember to use Documentation/SubmitChecklist when testing your code ***

See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this

Subject: return ENOENT from ext3_link when racing with unlink
From: Eric Sandeen <[email protected]>

Return -ENOENT from ext[34]_link if we've raced with unlink and i_nlink is
0. Doing otherwise has the potential to corrupt the orphan inode list,
because we'd wind up with an inode with a non-zero link count on the list,
and it will never get properly cleaned up & removed from the orphan list
before it is freed.

Signed-off-by: Eric Sandeen <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

fs/ext3/namei.c | 2 ++
fs/ext4/namei.c | 2 ++
2 files changed, 4 insertions(+)

diff -puN fs/ext3/namei.c~return-enoent-from-ext3_link-when-racing-with-unlink fs/ext3/namei.c
--- a/fs/ext3/namei.c~return-enoent-from-ext3_link-when-racing-with-unlink
+++ a/fs/ext3/namei.c
@@ -2191,6 +2191,8 @@ static int ext3_link (struct dentry * ol

if (inode->i_nlink >= EXT3_LINK_MAX)
return -EMLINK;
+ if (inode->i_nlink == 0)
+ return -ENOENT;

handle = ext3_journal_start(dir, EXT3_DATA_TRANS_BLOCKS(dir->i_sb) +
diff -puN fs/ext4/namei.c~return-enoent-from-ext3_link-when-racing-with-unlink fs/ext4/namei.c
--- a/fs/ext4/namei.c~return-enoent-from-ext3_link-when-racing-with-unlink
+++ a/fs/ext4/namei.c
@@ -2189,6 +2189,8 @@ static int ext4_link (struct dentry * ol

if (inode->i_nlink >= EXT4_LINK_MAX)
return -EMLINK;
+ if (inode->i_nlink == 0)
+ return -ENOENT;

handle = ext4_journal_start(dir, EXT4_DATA_TRANS_BLOCKS(dir->i_sb) +

Patches currently in -mm which might be from [email protected] are