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[XFS] Really fix use after free in xfs_iunpin.

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The previous attempts to fix the linux inode use-after-free in xfs_iunpin
simply made the problem harder to hit. We actually need complete exclusion
between xfs_reclaim and xfs_iunpin, as well as ensuring that the i_flags
are consistent during both of these functions. Introduce a new spinlock
for exclusion and the i_flags, and fix up xfs_iunpin to use igrab before
marking the inode dirty.

SGI-PV: 952967
SGI-Modid: xfs-linux-melb:xfs-kern:26964a

Signed-off-by: David Chinner <dgc@sgi.com>
Signed-off-by: Tim Shimmin <tes@sgi.com>
This commit is contained in:
David Chinner
2006-09-28 11:06:03 +10:00
committed by Tim Shimmin
parent 01106eae97
commit f273ab848b
6 changed files with 35 additions and 3 deletions
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fs/xfs/xfs_itable.c
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@@ -577,6 +577,7 @@ xfs_bulkstat(
KM_SLEEP);
ip->i_ino = ino;
ip->i_mount = mp;
spin_lock_init(&ip->i_flags_lock);
if (bp)
xfs_buf_relse(bp);
error = xfs_itobp(mp, NULL, ip,