From fb6791d100d1bba20b5cdbc4912e1f7086ec60f8 Mon Sep 17 00:00:00 2001 From: David Teigland Date: Tue, 13 Nov 2012 10:58:56 -0500 Subject: [PATCH] GFS2: skip dlm_unlock calls in unmount When unmounting, gfs2 does a full dlm_unlock operation on every cached lock. This can create a very large amount of work and can take a long time to complete. However, the vast majority of these dlm unlock operations are unnecessary because after all the unlocks are done, gfs2 leaves the dlm lockspace, which automatically clears the locks of the leaving node, without unlocking each one individually. So, gfs2 can skip explicit dlm unlocks, and use dlm_release_lockspace to remove the locks implicitly. The one exception is when the lock's lvb is being used. In this case, dlm_unlock is called because it may update the lvb of the resource. Signed-off-by: David Teigland Signed-off-by: Steven Whitehouse --- fs/gfs2/glock.c | 1 + fs/gfs2/incore.h | 1 + fs/gfs2/lock_dlm.c | 8 ++++++++ 3 files changed, 10 insertions(+) diff --git a/fs/gfs2/glock.c b/fs/gfs2/glock.c index 6114571a979a..9d29a5167d34 100644 --- a/fs/gfs2/glock.c +++ b/fs/gfs2/glock.c @@ -1526,6 +1526,7 @@ static void dump_glock_func(struct gfs2_glock *gl) void gfs2_gl_hash_clear(struct gfs2_sbd *sdp) { + set_bit(SDF_SKIP_DLM_UNLOCK, &sdp->sd_flags); glock_hash_walk(clear_glock, sdp); flush_workqueue(glock_workqueue); wait_event(sdp->sd_glock_wait, atomic_read(&sdp->sd_glock_disposal) == 0); diff --git a/fs/gfs2/incore.h b/fs/gfs2/incore.h index a46f03485936..a35ef5cd1480 100644 --- a/fs/gfs2/incore.h +++ b/fs/gfs2/incore.h @@ -539,6 +539,7 @@ enum { SDF_DEMOTE = 5, SDF_NOJOURNALID = 6, SDF_RORECOVERY = 7, /* read only recovery */ + SDF_SKIP_DLM_UNLOCK = 8, }; #define GFS2_FSNAME_LEN 256 diff --git a/fs/gfs2/lock_dlm.c b/fs/gfs2/lock_dlm.c index 0fb6539b0c8c..f6504d3fadb3 100644 --- a/fs/gfs2/lock_dlm.c +++ b/fs/gfs2/lock_dlm.c @@ -289,6 +289,14 @@ static void gdlm_put_lock(struct gfs2_glock *gl) gfs2_glstats_inc(gl, GFS2_LKS_DCOUNT); gfs2_sbstats_inc(gl, GFS2_LKS_DCOUNT); gfs2_update_request_times(gl); + + /* don't want to skip dlm_unlock writing the lvb when lock is ex */ + if (test_bit(SDF_SKIP_DLM_UNLOCK, &sdp->sd_flags) && + gl->gl_state != LM_ST_EXCLUSIVE) { + gfs2_glock_free(gl); + return; + } + error = dlm_unlock(ls->ls_dlm, gl->gl_lksb.sb_lkid, DLM_LKF_VALBLK, NULL, gl); if (error) {