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[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>
This commit is contained in:
Lachlan McIlroy 2008-10-30 16:59:06 +11:00 committed by Lachlan McIlroy
parent 9ccbece546
commit 2cf7f0da3a
1 changed files with 1 additions and 1 deletions
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2
fs/xfs/xfs_inode.c
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@ -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);
/*