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authorEric Sandeen <sandeen@redhat.com>2007-02-10 04:46:16 -0500
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-02-11 13:51:34 -0500
commit2988a7740dc0dd9a0cb56576e8fe1d777dff0db3 (patch)
tree9c1b67be5d16a24d5c613ecb8e3804c7ff3994da /fs/ext4/namei.c
parent967bb77c69e3bc44dd1128a8b503a205cce3fd4a (diff)
[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: Eric Sandeen <sandeen@redhat.com> Cc: <linux-ext4@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/ext4/namei.c')
-rw-r--r--fs/ext4/namei.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index e5a74a5ac261..05c0d7f8fdf9 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -2189,6 +2189,12 @@ static int ext4_link (struct dentry * old_dentry,
2189 2189
2190 if (inode->i_nlink >= EXT4_LINK_MAX) 2190 if (inode->i_nlink >= EXT4_LINK_MAX)
2191 return -EMLINK; 2191 return -EMLINK;
2192 /*
2193 * Return -ENOENT if we've raced with unlink and i_nlink is 0. Doing
2194 * otherwise has the potential to corrupt the orphan inode list.
2195 */
2196 if (inode->i_nlink == 0)
2197 return -ENOENT;
2192 2198
2193retry: 2199retry:
2194 handle = ext4_journal_start(dir, EXT4_DATA_TRANS_BLOCKS(dir->i_sb) + 2200 handle = ext4_journal_start(dir, EXT4_DATA_TRANS_BLOCKS(dir->i_sb) +