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ceph: use empty snap context for uninline_data and get_pool_perm

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Cached_context in ceph_snap_realm is directly accessed by
uninline_data() and get_pool_perm(). This is racy in theory.
both uninline_data() and get_pool_perm() do not modify existing
object, they only create new object. So we can pass the empty
snap context to them.  Unlike cached_context in ceph_snap_realm,
we do not need to protect the empty snap context.

Signed-off-by: Yan, Zheng <zyan@redhat.com>
This commit is contained in:
Yan, Zheng
2015-05-01 10:03:40 +08:00
committed by Ilya Dryomov
parent b01da6a08c
commit 7b06a826e7
3 changed files with 14 additions and 14 deletions
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fs/ceph/super.h
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@@ -692,6 +692,7 @@ static inline int default_congestion_kb(void)
/* snap.c */
extern struct ceph_snap_context *ceph_empty_snapc;
struct ceph_snap_realm *ceph_lookup_snap_realm(struct ceph_mds_client *mdsc,
u64 ino);
extern void ceph_get_snap_realm(struct ceph_mds_client *mdsc,