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authorPranith Kumar K <pranithk@gluster.com>2012-07-30 21:01:21 +0530
committerVijay Bellur <vbellur@redhat.com>2012-08-17 01:14:38 -0700
commit1df75bc835a75f17fa0fcd3722ef68f05f5f3200 (patch)
treeae228e509ee89d1621aeddb9dc8192ef01cfbfc1
parent30a9ebd91339f36d092f46bbba116fa4047fb8c5 (diff)
cluster/afr: Handle child_up & fd not opened case in xaction
RCA: When an fd is opened while a brick is down, after the brick comes back up afr issues open on the other brick. It can fail for a number of reasons (enoent etc). While the system is in that state, inode/entrylks pre-op happen only on the brick that is up and fd is opened for fd-fops. post-op should consider only the bricks where both pre-op and fop succeeded as success, rest of them as failures. Code now marks only the children that are down as failures as opposed to child_down & fd-not-opened. This makes change-log appear as success on the subvolume where we did not do any fop leading to no change-log but differences in data/metadata for reg-files. Fix: Mark non-participants of fop as failure. This is tracked in transaction.pre_op[]. Tests: Simulated the scenario using err-gen on top of one of the client xlator which fails all fops always. Performed fops and the changelog represented pending fops on the brick with err-gen loaded. Tested the case of brick down and perform entry/metadata/data operations to confirm they still work as expected. Change-Id: I41905936126b19abba56ca581c0301a894507e1a BUG: 844987 Signed-off-by: Pranith Kumar K <pranithk@gluster.com> Reviewed-on: http://review.gluster.com/3776 Tested-by: Gluster Build System <jenkins@build.gluster.com> Reviewed-by: Vijay Bellur <vbellur@redhat.com>
-rw-r--r--xlators/cluster/afr/src/afr-transaction.c15
1 files changed, 8 insertions, 7 deletions
diff --git a/xlators/cluster/afr/src/afr-transaction.c b/xlators/cluster/afr/src/afr-transaction.c
index e0729fb..b21e14a 100644
--- a/xlators/cluster/afr/src/afr-transaction.c
+++ b/xlators/cluster/afr/src/afr-transaction.c
@@ -175,16 +175,16 @@ out:
static void
-__mark_down_children (int32_t *pending[], int child_count,
- unsigned char *child_up, afr_transaction_type type)
+__mark_non_participant_children (int32_t *pending[], int child_count,
+ unsigned char *participants,
+ afr_transaction_type type)
{
int i = 0;
int j = 0;
+ j = afr_index_for_transaction_type (type);
for (i = 0; i < child_count; i++) {
- j = afr_index_for_transaction_type (type);
-
- if (!child_up[i])
+ if (!participants[i])
pending[i][j] = 0;
}
}
@@ -511,8 +511,9 @@ afr_changelog_post_op (call_frame_t *frame, xlator_t *this)
local = frame->local;
int_lock = &local->internal_lock;
- __mark_down_children (local->pending, priv->child_count,
- local->child_up, local->transaction.type);
+ __mark_non_participant_children (local->pending, priv->child_count,
+ local->transaction.pre_op,
+ local->transaction.type);
if (local->fd)
afr_transaction_rm_stale_children (frame, this,