Commit 2988a774 authored by Eric Sandeen's avatar Eric Sandeen Committed by Linus Torvalds
Browse files

[PATCH] return ENOENT from ext3_link when racing with unlink



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.

[akpm@osdl.org: build fix]
Signed-off-by: default avatarEric Sandeen <sandeen@redhat.com>
Cc: <linux-ext4@vger.kernel.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 967bb77c
......@@ -2191,6 +2191,12 @@ static int ext3_link (struct dentry * old_dentry,
if (inode->i_nlink >= EXT3_LINK_MAX)
return -EMLINK;
/*
* Return -ENOENT if we've raced with unlink and i_nlink is 0. Doing
* otherwise has the potential to corrupt the orphan inode list.
*/
if (inode->i_nlink == 0)
return -ENOENT;
retry:
handle = ext3_journal_start(dir, EXT3_DATA_TRANS_BLOCKS(dir->i_sb) +
......
......@@ -2189,6 +2189,12 @@ static int ext4_link (struct dentry * old_dentry,
if (inode->i_nlink >= EXT4_LINK_MAX)
return -EMLINK;
/*
* Return -ENOENT if we've raced with unlink and i_nlink is 0. Doing
* otherwise has the potential to corrupt the orphan inode list.
*/
if (inode->i_nlink == 0)
return -ENOENT;
retry:
handle = ext4_journal_start(dir, EXT4_DATA_TRANS_BLOCKS(dir->i_sb) +
......
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