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authorRavishankar N <ravishankar@redhat.com>2015-04-15 22:22:08 +0530
committerVijay Bellur <vbellur@redhat.com>2015-05-05 00:06:34 -0700
commit25e8e74eb7b81ccd114a9833371a3f72d284c48d (patch)
tree0c82b2ad9133c55c74852ce65d027bc36ed6cac5 /xlators/cluster/afr/src/afr.h
parent6d7428d2018c061ca2791443bd90980f9755ded3 (diff)
afr: add arbitration support
Add logic in afr to work in conjunction with the arbiter xlator when a replica 3 arbiter volume is created. More specifically, this patch: * Enables full locks for afr data transaction for such volumes. * Removes the upfront marking of pending xattrs at the time of pre-op and defer it to post-op. (This is an arbiter independent change and is made for all afr transactions.) * After pre-op stage, check if we can proceed with the fop stage without ending up in split-brain by examining the changelog xattrs. * Unwinds the fop with failure if only one source was available at the time of pre-op and the fop happened to fail on particular source brick. * Skips data self-heal if arbiter brick is the only source available. * Adds the arbiter-count option to the shd graph. This patch is a part of the arbiter logic implementation for 3 way AFR details of which can be found at http://review.gluster.org/#/c/9656/ Change-Id: I9603db9d04de5626eb2f4d8d959ef5b46113561d BUG: 1199985 Signed-off-by: Ravishankar N <ravishankar@redhat.com> Reviewed-on: http://review.gluster.org/10258 Tested-by: Gluster Build System <jenkins@build.gluster.com> Reviewed-by: Pranith Kumar Karampuri <pkarampu@redhat.com>
Diffstat (limited to 'xlators/cluster/afr/src/afr.h')
-rw-r--r--xlators/cluster/afr/src/afr.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/xlators/cluster/afr/src/afr.h b/xlators/cluster/afr/src/afr.h
index f7bc6ea0f94..6cb708ffbd7 100644
--- a/xlators/cluster/afr/src/afr.h
+++ b/xlators/cluster/afr/src/afr.h
@@ -39,6 +39,8 @@
#define AFR_DOM_COUNT_MAX 3
#define AFR_NUM_CHANGE_LOGS 3 /*data + metadata + entry*/
+#define ARBITER_BRICK_INDEX 2
+
typedef int (*afr_lock_cbk_t) (call_frame_t *frame, xlator_t *this);
typedef int (*afr_read_txn_wind_t) (call_frame_t *frame, xlator_t *this, int subvol);
@@ -656,6 +658,10 @@ typedef struct _afr_local {
unsigned char *pre_op;
+ /* For arbiter configuration only. */
+ dict_t **pre_op_xdata;
+ unsigned char *pre_op_sources;
+
/* @fop_subvols: subvolumes on which FOP will be attempted */
unsigned char *fop_subvols;