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xfs: Properly exclude IO type flags from buffer flags 

Recent event tracing during a debugging session showed that flags
that define the IO type for a buffer are leaking into the flags on
the buffer incorrectly. Fix the flag exclusion mask in
xfs_buf_alloc() to avoid problems that may be caused by such
leakage.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Mark Tinguely <tinguely@sgi.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Ben Myers <bpm@sgi.com>
This commit is contained in:
Dave Chinner 2012-04-23 15:59:05 +10:00 committed by Ben Myers
parent ad1e95c54e
commit 12bcb3f7d4
1 changed files with 3 additions and 2 deletions
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5
fs/xfs/xfs_buf.c
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@ -178,9 +178,10 @@ xfs_buf_alloc(
return NULL; return NULL;
/* /*
* We don't want certain flags to appear in b_flags. * We don't want certain flags to appear in b_flags unless they are
* specifically set by later operations on the buffer.
*/ */
flags &= ~(XBF_MAPPED|XBF_READ_AHEAD); flags &= ~(XBF_MAPPED | XBF_TRYLOCK | XBF_ASYNC | XBF_READ_AHEAD);
atomic_set(&bp->b_hold, 1); atomic_set(&bp->b_hold, 1);
atomic_set(&bp->b_lru_ref, 1); atomic_set(&bp->b_lru_ref, 1);