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author | Varun Shastry <vshastry@redhat.com> | 2013-12-26 15:30:49 +0530 |
---|---|---|
committer | Raghavendra G <rgowdapp@redhat.com> | 2014-06-18 09:50:32 -0700 |
commit | b54764ba860c3baba4b441ae7fcf043ab7eb46db (patch) | |
tree | 5255300a883af00f8c112719a7bbc046d42f1e4a /xlators/features | |
parent | 2b87e157a50953b542d5fc49fac84813ee116ce5 (diff) |
features/quota: Make dht_statfs_cbk more fool proof from quota_deem_statfs
Problem:
The function depends on the fact that if quota-deem-statfs option is enabled,
all of the subvolumes send their xdata with quota-deem-statfs flag ON. But,
this may not be true in case of errors in some of the subvolumes.
There is a decision/policy made which assumes quota-deem-statfs to be ON if at
least ONE of the subvolumes sends the flag ON. By this, df reports quota
modified statfs values if *at least ONE* of the bricks sends the
quota-deem-statfs flag ON. This can be visualized with the below "Transition
Diagram/State Machine".
Event: Each Quota deem statfs status from the individual bricks
Action: Decision taken on the calculation of the statvfs received
State: Whether quota deem statfs is ON or OFF (0: OFF, 1: ON)
Input: Event from individual bricks
___ ___
/ \ OFF* / \ (OFF|ON)*
| | | |
\ / ON \ /
-----> 0 ----------------> 1
The below Transition Function depicts the relation between the statfs
calculation based on the events received.
State Event action
-------------------------------------
OFF OFF OFF
OFF ON REPLACE
ON OFF NEGLECT
ON ON COMPARE
Change-Id: I0e8fb7d3945a3ca3dde0bb99de6cd397e27a3162
BUG: 1048786
Signed-off-by: Varun Shastry <vshastry@redhat.com>
Reviewed-on: http://review.gluster.org/6652
Reviewed-by: Krishnan Parthasarathi <kparthas@redhat.com>
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Raghavendra G <rgowdapp@redhat.com>
Tested-by: Raghavendra G <rgowdapp@redhat.com>
Diffstat (limited to 'xlators/features')
0 files changed, 0 insertions, 0 deletions