From 3682513827f0f61fac51fd49d69b1807401a9b77 Mon Sep 17 00:00:00 2001 From: Susant Palai Date: Fri, 22 Apr 2016 15:20:39 +0530 Subject: 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: 1338501 Signed-off-by: Susant Palai Reviewed-on: http://review.gluster.org/14462 Tested-by: Kotresh HR Smoke: Gluster Build System NetBSD-regression: NetBSD Build System Reviewed-by: Raghavendra G CentOS-regression: Gluster Build System --- libglusterfs/src/glusterfs.h | 2 ++ 1 file changed, 2 insertions(+) (limited to 'libglusterfs/src/glusterfs.h') diff --git a/libglusterfs/src/glusterfs.h b/libglusterfs/src/glusterfs.h index d5fde68d76a..46131e11a3f 100644 --- a/libglusterfs/src/glusterfs.h +++ b/libglusterfs/src/glusterfs.h @@ -84,6 +84,8 @@ #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" -- cgit