GFS2: Merge lock_dlm module into GFS2
This is the big patch that I've been working on for some time
now. There are many reasons for wanting to make this change
such as:
o Reducing overhead by eliminating duplicated fields between structures
o Simplifcation of the code (reduces the code size by a fair bit)
o The locking interface is now the DLM interface itself as proposed
some time ago.
o Fewer lookups of glocks when processing replies from the DLM
o Fewer memory allocations/deallocations for each glock
o Scope to do further optimisations in the future (but this patch is
more than big enough for now!)
Please note that (a) this patch relates to the lock_dlm module and
not the DLM itself, that is still a separate module; and (b) that
we retain the ability to build GFS2 as a standalone single node
filesystem with out requiring the DLM.
This patch needs a lot of testing, hence my keeping it I restarted
my -git tree after the last merge window. That way, this has the maximum
exposure before its merged. This is (modulo a few minor bug fixes) the
same patch that I've been posting on and off the the last three months
and its passed a number of different tests so far.
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
diff --git a/fs/gfs2/quota.c b/fs/gfs2/quota.c
index e8ef0f8..8d53f66 100644
--- a/fs/gfs2/quota.c
+++ b/fs/gfs2/quota.c
@@ -45,7 +45,6 @@
#include <linux/fs.h>
#include <linux/bio.h>
#include <linux/gfs2_ondisk.h>
-#include <linux/lm_interface.h>
#include <linux/kthread.h>
#include <linux/freezer.h>
@@ -108,7 +107,7 @@
gfs2_assert_warn(sdp, !qd->qd_slot_count);
gfs2_assert_warn(sdp, !qd->qd_bh_count);
- gfs2_lvb_unhold(qd->qd_gl);
+ gfs2_glock_put(qd->qd_gl);
atomic_dec(&sdp->sd_quota_count);
/* Delete it from the common reclaim list */
@@ -157,11 +156,6 @@
if (error)
goto fail;
- error = gfs2_lvb_hold(qd->qd_gl);
- gfs2_glock_put(qd->qd_gl);
- if (error)
- goto fail;
-
*qdp = qd;
return 0;
@@ -211,7 +205,7 @@
if (qd || !create) {
if (new_qd) {
- gfs2_lvb_unhold(new_qd->qd_gl);
+ gfs2_glock_put(new_qd->qd_gl);
kmem_cache_free(gfs2_quotad_cachep, new_qd);
}
*qdp = qd;
@@ -1280,7 +1274,7 @@
gfs2_assert_warn(sdp, qd->qd_slot_count == 1);
gfs2_assert_warn(sdp, !qd->qd_bh_count);
- gfs2_lvb_unhold(qd->qd_gl);
+ gfs2_glock_put(qd->qd_gl);
kmem_cache_free(gfs2_quotad_cachep, qd);
spin_lock(&qd_lru_lock);