diff options
| author | Susant Palai <spalai@redhat.com> | 2016-04-22 15:20:39 +0530 |
|---|---|---|
| committer | Raghavendra G <rgowdapp@redhat.com> | 2016-06-03 03:06:31 -0700 |
| commit | 19b8c09709c7aeecb84eafb02de797a49a004638 (patch) | |
| tree | 75732b74043843898c6b2c94152a55f5bf6d1b1c /libglusterfs | |
| parent | 03d523504230c336cf585159266e147945f31153 (diff) | |
posix/lock: implement meta-lock/unlock functionality
problem : The lock state needs to be protected when rebalance is reading the
lock state on the source. Otherwise there will be locks left unmigrated.
Hence, to synchronize incoming lock requests with lock-migration, meta lock
is needed. Any new lock request will be queued if there is an active meta-lock
and with sucessful lock migration, will be unwound with EREMOTE, so that
dht module can wind the request to the correct destination.
On a successful lock migration, "pl_inode->migrated" flag is enabled. Hence,
any further request would be unwound with EREMOTE and will be redirected to
new destination.
More details can be found here:
https://github.com/gluster/glusterfs-specs/blob/master/accepted/Lock-Migration.md
design discussion:
https://www.gluster.org/pipermail/gluster-devel/2016-January/048088.html
Change-Id: Ief033d5652b5ca4ba6f499110a521cae283d6aba
BUG: 1331720
Signed-off-by: Susant Palai <spalai@redhat.com>
Reviewed-on: http://review.gluster.org/14251
Tested-by: Prasanna Kumar Kalever <pkalever@redhat.com>
Smoke: Gluster Build System <jenkins@build.gluster.com>
NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
CentOS-regression: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Raghavendra G <rgowdapp@redhat.com>
Diffstat (limited to 'libglusterfs')
| -rw-r--r-- | libglusterfs/src/glusterfs.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/libglusterfs/src/glusterfs.h b/libglusterfs/src/glusterfs.h index 610dfc9e7d9..128dcd32e5f 100644 --- a/libglusterfs/src/glusterfs.h +++ b/libglusterfs/src/glusterfs.h @@ -85,6 +85,8 @@ #define GF_REBAL_FIND_LOCAL_SUBVOL "glusterfs.find-local-subvol" #define GF_XATTR_VOL_ID_KEY "trusted.glusterfs.volume-id" #define GF_XATTR_LOCKINFO_KEY "trusted.glusterfs.lockinfo" +#define GF_META_LOCK_KEY "glusterfs.lock-migration-meta-lock" +#define GF_META_UNLOCK_KEY "glusterfs.lock-migration-meta-unlock" #define GF_XATTR_GET_REAL_FILENAME_KEY "glusterfs.get_real_filename:" #define GF_XATTR_USER_PATHINFO_KEY "glusterfs.pathinfo" #define GF_INTERNAL_IGNORE_DEEM_STATFS "ignore-deem-statfs" |