|author||Raghavendra G <firstname.lastname@example.org>||2013-09-16 17:46:50 +0530|
|committer||Anand Avati <email@example.com>||2013-11-26 10:24:02 -0800|
features/quota: Improvements to quota
* Two stages of quota enforcement is done: Soft and hard quota Upon reaching soft quota limit on the directory it logs/alerts in the quota daemon log (ie DEFAULT_LOG_DIR/quotad.log) and no more writes allowed after hard quota limit. After reaching the soft-limit the daemon alerts the user/admin repeatively for every 'alert-time', which is configurable. * Quota enforcer is moved to server-side. It takes care of enforcing quota. Since enforcer doesn't have the cluster view, it relies on another service called quota-aggregator. Aggregator, on query can return the size of a directory based on the cluster view. Enforcer is always loaded in the server graph and is by passed if the feature is not enabled. Options specific to enforcer: server-quota - Specifies whether the feature is on/off. It is used to by pass the quota if turned off. deem-statfs - If set to on, it takes quota limits into consideration while estimating fs size. (df command). The algorithm followed is, i. Adjust statvfs based on limit configured on root. ii. If limit is set on the inode passed, use size/limits on that inode to populate statvfs. Otherwise, use size/limits configured on root. iii. Upon statvfs, update the ctx->size on the inode. iv. Don't let DHT aggregate, instead take the maximum of the usages from the subvols of the DHT, since each of it contains the complete information. Enforcer also makes use of gfid-to-path conversion functionality to work correctly when a client like nfs predominently relies on nameless lookups. * Quota Aggregator acts as a thin client to provide cluster view Its a lightweight *gluster client* process with no mount point, started upon enabling quota or restarting the volume. This is a single process run on each brick, which can answer queries on all volumes in the cluster. Its volfile stored in GLUSTERD_DEFAULT_WORKING_DIR/quotad/quotad.vol. Credits: Raghavendra Bhat <firstname.lastname@example.org> Varun Shastry <email@example.com> Shishir Gowda <firstname.lastname@example.org> Kruthika Dhananjay <email@example.com> Brian Foster <firstname.lastname@example.org> Krishnan Parthasarathi <email@example.com> Change-Id: Id1cb25b414951da34c665a55f77385d482e0f9de BUG: 969461 Signed-off-by: Raghavendra G <firstname.lastname@example.org> Reviewed-on: http://review.gluster.org/5952 Tested-by: Gluster Build System <email@example.com> Reviewed-by: Anand Avati <firstname.lastname@example.org>
Diffstat (limited to 'xlators/lib')
1 files changed, 1 insertions, 0 deletions
diff --git a/xlators/lib/src/libxlator.h b/xlators/lib/src/libxlator.h
index 1d5e165..08bd77b 100644
@@ -32,6 +32,7 @@
#define MARKER_UUID_TYPE 1
#define MARKER_XTIME_TYPE 2
#define GF_XATTR_QUOTA_SIZE_KEY "trusted.glusterfs.quota.size"
+#define GF_XATTR_QUOTA_LIMIT_LIST "trusted.limit.list"
typedef int32_t (*xlator_specf_unwind_t) (call_frame_t *frame,