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ceph: fix improper use of smp_mb__before_atomic()

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[ Upstream commit 749607731e ]

This barrier only applies to the read-modify-write operations; in
particular, it does not apply to the atomic64_set() primitive.

Replace the barrier with an smp_mb().

Fixes: fdd4e15838 ("ceph: rework dcache readdir")
Reported-by: "Paul E. McKenney" <paulmck@linux.ibm.com>
Reported-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Andrea Parri <andrea.parri@amarulasolutions.com>
Reviewed-by: "Yan, Zheng" <zyan@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Andrea Parri
2019-05-20 19:23:58 +02:00
committed by Greg Kroah-Hartman
parent 443aeb7481
commit 64672c1f2c
1 changed files with 6 additions and 1 deletions
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7
fs/ceph/super.h
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@@ -517,7 +517,12 @@ static inline void __ceph_dir_set_complete(struct ceph_inode_info *ci,
long long release_count,
long long ordered_count)
{
smp_mb__before_atomic();
/*
* Makes sure operations that setup readdir cache (update page
* cache and i_size) are strongly ordered w.r.t. the following
* atomic64_set() operations.
*/
smp_mb();
atomic64_set(&ci->i_complete_seq[0], release_count);
atomic64_set(&ci->i_complete_seq[1], ordered_count);
}