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Date: Fri, 9 Jan 2009 15:41:41 -0600
From: David Teigland <teigland@...hat.com>
To: linux-kernel@...r.kernel.org
Subject: [PATCH] dlm: change rsbtbl rwlock to spinlock
The rwlock is almost always used in write mode, so there's no reason
to not use a spinlock instead.
Signed-off-by: David Teigland <teigland@...hat.com>
---
fs/dlm/debug_fs.c | 24 ++++++++++++------------
fs/dlm/dlm_internal.h | 2 +-
fs/dlm/lock.c | 26 +++++++++++++-------------
fs/dlm/lockspace.c | 2 +-
fs/dlm/recover.c | 10 +++++-----
5 files changed, 32 insertions(+), 32 deletions(-)
diff --git a/fs/dlm/debug_fs.c b/fs/dlm/debug_fs.c
index bc4af3e..1d1d274 100644
--- a/fs/dlm/debug_fs.c
+++ b/fs/dlm/debug_fs.c
@@ -416,7 +416,7 @@ static void *table_seq_start(struct seq_file *seq, loff_t *pos)
if (seq->op == &format3_seq_ops)
ri->format = 3;
- read_lock(&ls->ls_rsbtbl[bucket].lock);
+ spin_lock(&ls->ls_rsbtbl[bucket].lock);
if (!list_empty(&ls->ls_rsbtbl[bucket].list)) {
list_for_each_entry(r, &ls->ls_rsbtbl[bucket].list,
res_hashchain) {
@@ -424,12 +424,12 @@ static void *table_seq_start(struct seq_file *seq, loff_t *pos)
dlm_hold_rsb(r);
ri->rsb = r;
ri->bucket = bucket;
- read_unlock(&ls->ls_rsbtbl[bucket].lock);
+ spin_unlock(&ls->ls_rsbtbl[bucket].lock);
return ri;
}
}
}
- read_unlock(&ls->ls_rsbtbl[bucket].lock);
+ spin_unlock(&ls->ls_rsbtbl[bucket].lock);
/*
* move to the first rsb in the next non-empty bucket
@@ -447,18 +447,18 @@ static void *table_seq_start(struct seq_file *seq, loff_t *pos)
return NULL;
}
- read_lock(&ls->ls_rsbtbl[bucket].lock);
+ spin_lock(&ls->ls_rsbtbl[bucket].lock);
if (!list_empty(&ls->ls_rsbtbl[bucket].list)) {
r = list_first_entry(&ls->ls_rsbtbl[bucket].list,
struct dlm_rsb, res_hashchain);
dlm_hold_rsb(r);
ri->rsb = r;
ri->bucket = bucket;
- read_unlock(&ls->ls_rsbtbl[bucket].lock);
+ spin_unlock(&ls->ls_rsbtbl[bucket].lock);
*pos = n;
return ri;
}
- read_unlock(&ls->ls_rsbtbl[bucket].lock);
+ spin_unlock(&ls->ls_rsbtbl[bucket].lock);
}
}
@@ -477,7 +477,7 @@ static void *table_seq_next(struct seq_file *seq, void *iter_ptr, loff_t *pos)
* move to the next rsb in the same bucket
*/
- read_lock(&ls->ls_rsbtbl[bucket].lock);
+ spin_lock(&ls->ls_rsbtbl[bucket].lock);
rp = ri->rsb;
next = rp->res_hashchain.next;
@@ -485,12 +485,12 @@ static void *table_seq_next(struct seq_file *seq, void *iter_ptr, loff_t *pos)
r = list_entry(next, struct dlm_rsb, res_hashchain);
dlm_hold_rsb(r);
ri->rsb = r;
- read_unlock(&ls->ls_rsbtbl[bucket].lock);
+ spin_unlock(&ls->ls_rsbtbl[bucket].lock);
dlm_put_rsb(rp);
++*pos;
return ri;
}
- read_unlock(&ls->ls_rsbtbl[bucket].lock);
+ spin_unlock(&ls->ls_rsbtbl[bucket].lock);
dlm_put_rsb(rp);
/*
@@ -509,18 +509,18 @@ static void *table_seq_next(struct seq_file *seq, void *iter_ptr, loff_t *pos)
return NULL;
}
- read_lock(&ls->ls_rsbtbl[bucket].lock);
+ spin_lock(&ls->ls_rsbtbl[bucket].lock);
if (!list_empty(&ls->ls_rsbtbl[bucket].list)) {
r = list_first_entry(&ls->ls_rsbtbl[bucket].list,
struct dlm_rsb, res_hashchain);
dlm_hold_rsb(r);
ri->rsb = r;
ri->bucket = bucket;
- read_unlock(&ls->ls_rsbtbl[bucket].lock);
+ spin_unlock(&ls->ls_rsbtbl[bucket].lock);
*pos = n;
return ri;
}
- read_unlock(&ls->ls_rsbtbl[bucket].lock);
+ spin_unlock(&ls->ls_rsbtbl[bucket].lock);
}
}
diff --git a/fs/dlm/dlm_internal.h b/fs/dlm/dlm_internal.h
index ef2f1e3..076e86f 100644
--- a/fs/dlm/dlm_internal.h
+++ b/fs/dlm/dlm_internal.h
@@ -105,7 +105,7 @@ struct dlm_dirtable {
struct dlm_rsbtable {
struct list_head list;
struct list_head toss;
- rwlock_t lock;
+ spinlock_t lock;
};
struct dlm_lkbtable {
diff --git a/fs/dlm/lock.c b/fs/dlm/lock.c
index 6cfe65b..01e7d39 100644
--- a/fs/dlm/lock.c
+++ b/fs/dlm/lock.c
@@ -412,9 +412,9 @@ static int search_rsb(struct dlm_ls *ls, char *name, int len, int b,
unsigned int flags, struct dlm_rsb **r_ret)
{
int error;
- write_lock(&ls->ls_rsbtbl[b].lock);
+ spin_lock(&ls->ls_rsbtbl[b].lock);
error = _search_rsb(ls, name, len, b, flags, r_ret);
- write_unlock(&ls->ls_rsbtbl[b].lock);
+ spin_unlock(&ls->ls_rsbtbl[b].lock);
return error;
}
@@ -478,16 +478,16 @@ static int find_rsb(struct dlm_ls *ls, char *name, int namelen,
r->res_nodeid = nodeid;
}
- write_lock(&ls->ls_rsbtbl[bucket].lock);
+ spin_lock(&ls->ls_rsbtbl[bucket].lock);
error = _search_rsb(ls, name, namelen, bucket, 0, &tmp);
if (!error) {
- write_unlock(&ls->ls_rsbtbl[bucket].lock);
+ spin_unlock(&ls->ls_rsbtbl[bucket].lock);
dlm_free_rsb(r);
r = tmp;
goto out;
}
list_add(&r->res_hashchain, &ls->ls_rsbtbl[bucket].list);
- write_unlock(&ls->ls_rsbtbl[bucket].lock);
+ spin_unlock(&ls->ls_rsbtbl[bucket].lock);
error = 0;
out:
*r_ret = r;
@@ -530,9 +530,9 @@ static void put_rsb(struct dlm_rsb *r)
struct dlm_ls *ls = r->res_ls;
uint32_t bucket = r->res_bucket;
- write_lock(&ls->ls_rsbtbl[bucket].lock);
+ spin_lock(&ls->ls_rsbtbl[bucket].lock);
kref_put(&r->res_ref, toss_rsb);
- write_unlock(&ls->ls_rsbtbl[bucket].lock);
+ spin_unlock(&ls->ls_rsbtbl[bucket].lock);
}
void dlm_put_rsb(struct dlm_rsb *r)
@@ -967,7 +967,7 @@ static int shrink_bucket(struct dlm_ls *ls, int b)
for (;;) {
found = 0;
- write_lock(&ls->ls_rsbtbl[b].lock);
+ spin_lock(&ls->ls_rsbtbl[b].lock);
list_for_each_entry_reverse(r, &ls->ls_rsbtbl[b].toss,
res_hashchain) {
if (!time_after_eq(jiffies, r->res_toss_time +
@@ -978,20 +978,20 @@ static int shrink_bucket(struct dlm_ls *ls, int b)
}
if (!found) {
- write_unlock(&ls->ls_rsbtbl[b].lock);
+ spin_unlock(&ls->ls_rsbtbl[b].lock);
break;
}
if (kref_put(&r->res_ref, kill_rsb)) {
list_del(&r->res_hashchain);
- write_unlock(&ls->ls_rsbtbl[b].lock);
+ spin_unlock(&ls->ls_rsbtbl[b].lock);
if (is_master(r))
dir_remove(r);
dlm_free_rsb(r);
count++;
} else {
- write_unlock(&ls->ls_rsbtbl[b].lock);
+ spin_unlock(&ls->ls_rsbtbl[b].lock);
log_error(ls, "tossed rsb in use %s", r->res_name);
}
}
@@ -4224,7 +4224,7 @@ static struct dlm_rsb *find_purged_rsb(struct dlm_ls *ls, int bucket)
{
struct dlm_rsb *r, *r_ret = NULL;
- read_lock(&ls->ls_rsbtbl[bucket].lock);
+ spin_lock(&ls->ls_rsbtbl[bucket].lock);
list_for_each_entry(r, &ls->ls_rsbtbl[bucket].list, res_hashchain) {
if (!rsb_flag(r, RSB_LOCKS_PURGED))
continue;
@@ -4233,7 +4233,7 @@ static struct dlm_rsb *find_purged_rsb(struct dlm_ls *ls, int bucket)
r_ret = r;
break;
}
- read_unlock(&ls->ls_rsbtbl[bucket].lock);
+ spin_unlock(&ls->ls_rsbtbl[bucket].lock);
return r_ret;
}
diff --git a/fs/dlm/lockspace.c b/fs/dlm/lockspace.c
index 8d86b79..aa32e5f 100644
--- a/fs/dlm/lockspace.c
+++ b/fs/dlm/lockspace.c
@@ -464,7 +464,7 @@ static int new_lockspace(char *name, int namelen, void **lockspace,
for (i = 0; i < size; i++) {
INIT_LIST_HEAD(&ls->ls_rsbtbl[i].list);
INIT_LIST_HEAD(&ls->ls_rsbtbl[i].toss);
- rwlock_init(&ls->ls_rsbtbl[i].lock);
+ spin_lock_init(&ls->ls_rsbtbl[i].lock);
}
size = dlm_config.ci_lkbtbl_size;
diff --git a/fs/dlm/recover.c b/fs/dlm/recover.c
index 80aba5b..eda43f3 100644
--- a/fs/dlm/recover.c
+++ b/fs/dlm/recover.c
@@ -726,7 +726,7 @@ int dlm_create_root_list(struct dlm_ls *ls)
}
for (i = 0; i < ls->ls_rsbtbl_size; i++) {
- read_lock(&ls->ls_rsbtbl[i].lock);
+ spin_lock(&ls->ls_rsbtbl[i].lock);
list_for_each_entry(r, &ls->ls_rsbtbl[i].list, res_hashchain) {
list_add(&r->res_root_list, &ls->ls_root_list);
dlm_hold_rsb(r);
@@ -737,7 +737,7 @@ int dlm_create_root_list(struct dlm_ls *ls)
but no other recovery steps should do anything with them. */
if (dlm_no_directory(ls)) {
- read_unlock(&ls->ls_rsbtbl[i].lock);
+ spin_unlock(&ls->ls_rsbtbl[i].lock);
continue;
}
@@ -745,7 +745,7 @@ int dlm_create_root_list(struct dlm_ls *ls)
list_add(&r->res_root_list, &ls->ls_root_list);
dlm_hold_rsb(r);
}
- read_unlock(&ls->ls_rsbtbl[i].lock);
+ spin_unlock(&ls->ls_rsbtbl[i].lock);
}
out:
up_write(&ls->ls_root_sem);
@@ -775,7 +775,7 @@ void dlm_clear_toss_list(struct dlm_ls *ls)
int i;
for (i = 0; i < ls->ls_rsbtbl_size; i++) {
- write_lock(&ls->ls_rsbtbl[i].lock);
+ spin_lock(&ls->ls_rsbtbl[i].lock);
list_for_each_entry_safe(r, safe, &ls->ls_rsbtbl[i].toss,
res_hashchain) {
if (dlm_no_directory(ls) || !is_master(r)) {
@@ -783,7 +783,7 @@ void dlm_clear_toss_list(struct dlm_ls *ls)
dlm_free_rsb(r);
}
}
- write_unlock(&ls->ls_rsbtbl[i].lock);
+ spin_unlock(&ls->ls_rsbtbl[i].lock);
}
}
--
1.5.5.1
--
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