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authorLachlan McIlroy <lachlan@sgi.com>2008-10-30 16:59:06 +1100
committerLachlan McIlroy <lachlan@redback.melbourne.sgi.com>2008-11-10 17:51:00 +1100
commit2cf7f0da3ae225848a2ee10d4e216448a770fd00 (patch)
tree1cfbb7ca0b9a6742c8c35150f21d6ba91b153b36 /fs/xfs
parent9ccbece546cf836f67f6d9bb4bf2f70f7476cb2c (diff)
downloadlinux-2cf7f0da3ae225848a2ee10d4e216448a770fd00.tar.bz2
[XFS] Wait for all I/O on truncate to zero file size
It's possible to have outstanding xfs_ioend_t's queued when the file size is zero. This can happen in the direct I/O path when a direct I/O write fails due to ENOSPC. In this case the xfs_ioend_t will still be queued (ie xfs_end_io_direct() does not know that the I/O failed so can't force the xfs_ioend_t to be flushed synchronously). When we truncate a file on unlink we don't know to wait for these xfs_ioend_ts and we can have a use-after-free situation if the inode is reclaimed before the xfs_ioend_t is finally processed. As was suggested by Dave Chinner lets wait for all I/Os to complete when truncating the file size to zero. SGI-PV: 981668 SGI-Modid: xfs-linux-melb:xfs-kern:32216a Signed-off-by: Lachlan McIlroy <lachlan@sgi.com> Signed-off-by: Christoph Hellwig <hch@infradead.org>
Diffstat (limited to 'fs/xfs')
-rw-r--r--fs/xfs/xfs_inode.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c
index dbd9cef852ec..a391b955df01 100644
--- a/fs/xfs/xfs_inode.c
+++ b/fs/xfs/xfs_inode.c
@@ -1414,7 +1414,7 @@ xfs_itruncate_start(
mp = ip->i_mount;
/* wait for the completion of any pending DIOs */
- if (new_size < ip->i_size)
+ if (new_size == 0 || new_size < ip->i_size)
vn_iowait(ip);
/*