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xfs: prevent deadlock in xfs_qm_shake()

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It's possible to recurse into filesystem from the memory
allocation, which deadlocks in xfs_qm_shake(). Add check
for __GFP_FS, and bail out if it is not set.

Signed-off-by: Felix Blyakher <felixb@sgi.com>
Signed-off-by: Hedi Berriche <hedi@sgi.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Felix Blyakher <felixb@sgi.com>
This commit is contained in:
Felix Blyakher 2009-06-01 13:13:24 -05:00
parent e6da7c9fed
commit 1b17d76646
1 changed files with 1 additions and 1 deletions
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2
fs/xfs/linux-2.6/kmem.h
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@ -103,7 +103,7 @@ extern void *kmem_zone_zalloc(kmem_zone_t *, unsigned int __nocast);
static inline int
kmem_shake_allow(gfp_t gfp_mask)
{
return (gfp_mask & __GFP_WAIT) != 0;
return ((gfp_mask & __GFP_WAIT) && (gfp_mask & __GFP_FS));
}
#endif /* __XFS_SUPPORT_KMEM_H__ */