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Diffstat (limited to 'fs/gfs2/glock.c')
-rw-r--r--fs/gfs2/glock.c84
1 files changed, 41 insertions, 43 deletions
diff --git a/fs/gfs2/glock.c b/fs/gfs2/glock.c
index c2f41b4d00b..c8420f7e4db 100644
--- a/fs/gfs2/glock.c
+++ b/fs/gfs2/glock.c
@@ -31,6 +31,7 @@
#include <linux/bit_spinlock.h>
#include <linux/percpu.h>
#include <linux/list_sort.h>
+#include <linux/lockref.h>
#include "gfs2.h"
#include "incore.h"
@@ -129,10 +130,10 @@ void gfs2_glock_free(struct gfs2_glock *gl)
*
*/
-void gfs2_glock_hold(struct gfs2_glock *gl)
+static void gfs2_glock_hold(struct gfs2_glock *gl)
{
- GLOCK_BUG_ON(gl, atomic_read(&gl->gl_ref) == 0);
- atomic_inc(&gl->gl_ref);
+ GLOCK_BUG_ON(gl, __lockref_is_dead(&gl->gl_lockref));
+ lockref_get(&gl->gl_lockref);
}
/**
@@ -187,20 +188,6 @@ static void gfs2_glock_remove_from_lru(struct gfs2_glock *gl)
}
/**
- * gfs2_glock_put_nolock() - Decrement reference count on glock
- * @gl: The glock to put
- *
- * This function should only be used if the caller has its own reference
- * to the glock, in addition to the one it is dropping.
- */
-
-void gfs2_glock_put_nolock(struct gfs2_glock *gl)
-{
- if (atomic_dec_and_test(&gl->gl_ref))
- GLOCK_BUG_ON(gl, 1);
-}
-
-/**
* gfs2_glock_put() - Decrement reference count on glock
* @gl: The glock to put
*
@@ -211,17 +198,22 @@ void gfs2_glock_put(struct gfs2_glock *gl)
struct gfs2_sbd *sdp = gl->gl_sbd;
struct address_space *mapping = gfs2_glock2aspace(gl);
- if (atomic_dec_and_lock(&gl->gl_ref, &lru_lock)) {
- __gfs2_glock_remove_from_lru(gl);
- spin_unlock(&lru_lock);
- spin_lock_bucket(gl->gl_hash);
- hlist_bl_del_rcu(&gl->gl_list);
- spin_unlock_bucket(gl->gl_hash);
- GLOCK_BUG_ON(gl, !list_empty(&gl->gl_holders));
- GLOCK_BUG_ON(gl, mapping && mapping->nrpages);
- trace_gfs2_glock_put(gl);
- sdp->sd_lockstruct.ls_ops->lm_put_lock(gl);
- }
+ if (lockref_put_or_lock(&gl->gl_lockref))
+ return;
+
+ lockref_mark_dead(&gl->gl_lockref);
+
+ spin_lock(&lru_lock);
+ __gfs2_glock_remove_from_lru(gl);
+ spin_unlock(&lru_lock);
+ spin_unlock(&gl->gl_lockref.lock);
+ spin_lock_bucket(gl->gl_hash);
+ hlist_bl_del_rcu(&gl->gl_list);
+ spin_unlock_bucket(gl->gl_hash);
+ GLOCK_BUG_ON(gl, !list_empty(&gl->gl_holders));
+ GLOCK_BUG_ON(gl, mapping && mapping->nrpages);
+ trace_gfs2_glock_put(gl);
+ sdp->sd_lockstruct.ls_ops->lm_put_lock(gl);
}
/**
@@ -244,7 +236,7 @@ static struct gfs2_glock *search_bucket(unsigned int hash,
continue;
if (gl->gl_sbd != sdp)
continue;
- if (atomic_inc_not_zero(&gl->gl_ref))
+ if (lockref_get_not_dead(&gl->gl_lockref))
return gl;
}
@@ -396,10 +388,11 @@ static void state_change(struct gfs2_glock *gl, unsigned int new_state)
held2 = (new_state != LM_ST_UNLOCKED);
if (held1 != held2) {
+ GLOCK_BUG_ON(gl, __lockref_is_dead(&gl->gl_lockref));
if (held2)
- gfs2_glock_hold(gl);
+ gl->gl_lockref.count++;
else
- gfs2_glock_put_nolock(gl);
+ gl->gl_lockref.count--;
}
if (held1 && held2 && list_empty(&gl->gl_holders))
clear_bit(GLF_QUEUED, &gl->gl_flags);
@@ -626,9 +619,9 @@ out:
out_sched:
clear_bit(GLF_LOCK, &gl->gl_flags);
smp_mb__after_clear_bit();
- gfs2_glock_hold(gl);
+ gl->gl_lockref.count++;
if (queue_delayed_work(glock_workqueue, &gl->gl_work, 0) == 0)
- gfs2_glock_put_nolock(gl);
+ gl->gl_lockref.count--;
return;
out_unlock:
@@ -754,7 +747,7 @@ int gfs2_glock_get(struct gfs2_sbd *sdp, u64 number,
gl->gl_sbd = sdp;
gl->gl_flags = 0;
gl->gl_name = name;
- atomic_set(&gl->gl_ref, 1);
+ gl->gl_lockref.count = 1;
gl->gl_state = LM_ST_UNLOCKED;
gl->gl_target = LM_ST_UNLOCKED;
gl->gl_demote_state = LM_ST_EXCLUSIVE;
@@ -1356,10 +1349,10 @@ void gfs2_glock_complete(struct gfs2_glock *gl, int ret)
}
}
- spin_unlock(&gl->gl_spin);
+ gl->gl_lockref.count++;
set_bit(GLF_REPLY_PENDING, &gl->gl_flags);
- smp_wmb();
- gfs2_glock_hold(gl);
+ spin_unlock(&gl->gl_spin);
+
if (queue_delayed_work(glock_workqueue, &gl->gl_work, 0) == 0)
gfs2_glock_put(gl);
}
@@ -1404,15 +1397,19 @@ __acquires(&lru_lock)
while(!list_empty(list)) {
gl = list_entry(list->next, struct gfs2_glock, gl_lru);
list_del_init(&gl->gl_lru);
+ if (!spin_trylock(&gl->gl_spin)) {
+ list_add(&gl->gl_lru, &lru_list);
+ atomic_inc(&lru_count);
+ continue;
+ }
clear_bit(GLF_LRU, &gl->gl_flags);
- gfs2_glock_hold(gl);
spin_unlock(&lru_lock);
- spin_lock(&gl->gl_spin);
+ gl->gl_lockref.count++;
if (demote_ok(gl))
handle_callback(gl, LM_ST_UNLOCKED, 0, false);
WARN_ON(!test_and_clear_bit(GLF_LOCK, &gl->gl_flags));
if (queue_delayed_work(glock_workqueue, &gl->gl_work, 0) == 0)
- gfs2_glock_put_nolock(gl);
+ gl->gl_lockref.count--;
spin_unlock(&gl->gl_spin);
spin_lock(&lru_lock);
}
@@ -1493,7 +1490,7 @@ static void examine_bucket(glock_examiner examiner, const struct gfs2_sbd *sdp,
rcu_read_lock();
hlist_bl_for_each_entry_rcu(gl, pos, head, gl_list) {
- if ((gl->gl_sbd == sdp) && atomic_inc_not_zero(&gl->gl_ref))
+ if ((gl->gl_sbd == sdp) && lockref_get_not_dead(&gl->gl_lockref))
examiner(gl);
}
rcu_read_unlock();
@@ -1746,7 +1743,7 @@ int gfs2_dump_glock(struct seq_file *seq, const struct gfs2_glock *gl)
state2str(gl->gl_demote_state), dtime,
atomic_read(&gl->gl_ail_count),
atomic_read(&gl->gl_revokes),
- atomic_read(&gl->gl_ref), gl->gl_hold_time);
+ (int)gl->gl_lockref.count, gl->gl_hold_time);
list_for_each_entry(gh, &gl->gl_holders, gh_list) {
error = dump_holder(seq, gh);
@@ -1902,7 +1899,8 @@ static int gfs2_glock_iter_next(struct gfs2_glock_iter *gi)
gi->nhash = 0;
}
/* Skip entries for other sb and dead entries */
- } while (gi->sdp != gi->gl->gl_sbd || atomic_read(&gi->gl->gl_ref) == 0);
+ } while (gi->sdp != gi->gl->gl_sbd ||
+ __lockref_is_dead(&gi->gl->gl_lockref));
return 0;
}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-11-27 05:29:01 +0000