cluster/ec: Prevent double unwind

        Backport of http://review.gluster.com/11111

Problem:
1) ec_access/ec_readlink_/ec_readdir[p] _cbks are trying to recover only from
ENOTCONN.
2) When the fop succeeds it unwinds right away. But when its
ec_fop_manager resumes, if the number of bricks that are up is less than
ec->fragments, the the state machine will resume with -EC_STATE_REPORT which
unwinds again. This will lead to crashes.

Fix:
- If fop fails retry on other subvols, as ESTALE/ENOENT/EBADFD etc are also
recoverable.
- unwind success/failure in _cbks

BUG: 1229331
Change-Id: I7510984a237761efba65e872313a8ede8b7543e5
Signed-off-by: Pranith Kumar K <pkarampu@redhat.com>
Reviewed-on: http://review.gluster.org/11128
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Tested-by: NetBSD Build System <jenkins@build.gluster.org>
Reviewed-by: Xavier Hernandez <xhernandez@datalab.es>

1 files changed, 1 insertions, 2 deletions

diff --git a/xlators/cluster/ec/src/ec-common.h b/xlators/cluster/ec/src/ec-common.h
index c0db0218699..e3f01cac26a 100644
--- a/xlators/cluster/ec/src/ec-common.h
+++ b/xlators/cluster/ec/src/ec-common.h
@@ -75,8 +75,7 @@ typedef enum {
 #define EC_STATE_HEAL_POST_INODELK_UNLOCK   217
 #define EC_STATE_HEAL_DISPATCH              218
 
-int32_t ec_dispatch_one_retry(ec_fop_data_t * fop, int32_t idx, int32_t op_ret,
-                              int32_t op_errno);
+int32_t ec_dispatch_one_retry(ec_fop_data_t *fop, int32_t idx, int32_t op_ret);
 int32_t ec_dispatch_next(ec_fop_data_t * fop, int32_t idx);
 
 void ec_complete(ec_fop_data_t * fop);