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ceph: quota: add counter for snaprealms with quota

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By keeping a counter with the number of snaprealms that have quota set
allows to optimize the functions that need to walk throught the realms
hierarchy looking for quotas.  Thus, if this counter is zero it's safe to
assume that there are no realms with quota.

Signed-off-by: Luis Henriques <lhenriques@suse.com>
Reviewed-by: "Yan, Zheng" <zyan@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
This commit is contained in:
Luis Henriques
2018-01-12 17:19:29 +00:00
committed by Ilya Dryomov
parent e3161f17d9
commit d557c48db7
5 changed files with 51 additions and 7 deletions
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2
fs/ceph/mds_client.h
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@@ -314,6 +314,8 @@ struct ceph_mds_client {
int max_sessions; /* len of s_mds_sessions */
int stopping; /* true if shutting down */
atomic64_t quotarealms_count; /* # realms with quota */
/*
* snap_rwsem will cover cap linkage into snaprealms, and
* realm snap contexts. (later, we can do per-realm snap