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GFS2: only use lvb on glocks that need it

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Save the effort of allocating, reading and writing
the lvb for most glocks that do not use it.

Signed-off-by: David Teigland <teigland@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
This commit is contained in:
David Teigland
2012-11-14 13:46:53 -05:00
committed by Steven Whitehouse
parent fb6791d100
commit dba2d70c5d
4 changed files with 32 additions and 13 deletions
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27
fs/gfs2/glock.c
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@@ -105,10 +105,12 @@ static void gfs2_glock_dealloc(struct rcu_head *rcu)
{
struct gfs2_glock *gl = container_of(rcu, struct gfs2_glock, gl_rcu);
if (gl->gl_ops->go_flags & GLOF_ASPACE)
if (gl->gl_ops->go_flags & GLOF_ASPACE) {
kmem_cache_free(gfs2_glock_aspace_cachep, gl);
else
} else {
kfree(gl->gl_lvb);
kmem_cache_free(gfs2_glock_cachep, gl);
}
}
void gfs2_glock_free(struct gfs2_glock *gl)
@@ -545,7 +547,10 @@ __acquires(&gl->gl_spin)
if (sdp->sd_lockstruct.ls_ops->lm_lock) {
/* lock_dlm */
ret = sdp->sd_lockstruct.ls_ops->lm_lock(gl, target, lck_flags);
GLOCK_BUG_ON(gl, ret);
if (ret) {
printk(KERN_ERR "GFS2: lm_lock ret %d\n", ret);
GLOCK_BUG_ON(gl, 1);
}
} else { /* lock_nolock */
finish_xmote(gl, target);
if (queue_delayed_work(glock_workqueue, &gl->gl_work, 0) == 0)
@@ -734,6 +739,18 @@ int gfs2_glock_get(struct gfs2_sbd *sdp, u64 number,
if (!gl)
return -ENOMEM;
memset(&gl->gl_lksb, 0, sizeof(struct dlm_lksb));
gl->gl_lvb = NULL;
if (glops->go_flags & GLOF_LVB) {
gl->gl_lvb = kzalloc(GFS2_MIN_LVB_SIZE, GFP_KERNEL);
if (!gl->gl_lvb) {
kmem_cache_free(cachep, gl);
return -ENOMEM;
}
gl->gl_lksb.sb_lvbptr = gl->gl_lvb;
}
atomic_inc(&sdp->sd_glock_disposal);
gl->gl_sbd = sdp;
gl->gl_flags = 0;
@@ -751,9 +768,6 @@ int gfs2_glock_get(struct gfs2_sbd *sdp, u64 number,
preempt_enable();
gl->gl_stats.stats[GFS2_LKS_DCOUNT] = 0;
gl->gl_stats.stats[GFS2_LKS_QCOUNT] = 0;
memset(&gl->gl_lksb, 0, sizeof(struct dlm_lksb));
memset(gl->gl_lvb, 0, 32 * sizeof(char));
gl->gl_lksb.sb_lvbptr = gl->gl_lvb;
gl->gl_tchange = jiffies;
gl->gl_object = NULL;
gl->gl_hold_time = GL_GLOCK_DFT_HOLD;
@@ -775,6 +789,7 @@ int gfs2_glock_get(struct gfs2_sbd *sdp, u64 number,
tmp = search_bucket(hash, sdp, &name);
if (tmp) {
spin_unlock_bucket(hash);
kfree(gl->gl_lvb);
kmem_cache_free(cachep, gl);
atomic_dec(&sdp->sd_glock_disposal);
gl = tmp;