Messages in this thread Patch in this message | | | Subject | [DLM] fix resend rcom lock [2/54] | From | Steven Whitehouse <> | Date | Mon, 05 Feb 2007 14:09:59 +0000 |
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>From 3f75e071fc3e5479800614656492230a1ce50182 Mon Sep 17 00:00:00 2001 From: David Teigland <teigland@redhat.com> Date: Wed, 13 Dec 2006 10:36:37 -0600 Subject: [PATCH] [DLM] fix resend rcom lock
There's a chance the new master of resource hasn't learned it's the new master before another node sends it a lock during recovery. The node sending the lock needs to resend if this happens.
- A sends a master lookup for resource R to C - B sends a master lookup for resource R to C - C receives A's lookup, assigns A to be master of R and sends a reply back to A - C receives B's lookup and sends a reply back to B saying that A is the master - B receives lookup reply from C and sends its lock for R to A - A receives lock from B, doesn't think it's the master of R and sends an error back to B - A receives lookup reply from C and becomes master of R - B gets error back from A and resends its lock back to A (this resending is what this patch does) - A receives lock from B, it now sees it's the master of R and takes the lock
Signed-off-by: David Teigland <teigland@redhat.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
diff --git a/fs/dlm/lock.c b/fs/dlm/lock.c index 30878de..69ada58 100644 --- a/fs/dlm/lock.c +++ b/fs/dlm/lock.c @@ -3571,6 +3571,14 @@ int dlm_recover_process_copy(struct dlm_ls *ls, struct dlm_rcom *rc) lock_rsb(r); switch (error) { + case -EBADR: + /* There's a chance the new master received our lock before + dlm_recover_master_reply(), this wouldn't happen if we did + a barrier between recover_masters and recover_locks. */ + log_debug(ls, "master copy not ready %x r %lx %s", lkb->lkb_id, + (unsigned long)r, r->res_name); + dlm_send_rcom_lock(r, lkb); + goto out; case -EEXIST: log_debug(ls, "master copy exists %x", lkb->lkb_id); /* fall through */ @@ -3585,7 +3593,7 @@ int dlm_recover_process_copy(struct dlm_ls *ls, struct dlm_rcom *rc) /* an ack for dlm_recover_locks() which waits for replies from all the locks it sends to new masters */ dlm_recovered_lock(r); - + out: unlock_rsb(r); put_rsb(r); dlm_put_lkb(lkb); -- 1.4.4.2
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