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jbd2: Convert jbd2_slab_create_sem to mutex 

jbd2_slab_create_sem is used as a mutex, so make it one.

[ akpm muttered: We may as well make it local to
jbd2_journal_create_slab() also. ]

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Ted Ts'o <tytso@mit.edu>
Cc: Andrew Morton <akpm@linux-foundation.org>
LKML-Reference: <alpine.LFD.2.00.1010162231480.2496@localhost6.localdomain6>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
hifive-unleashed-5.1
Thomas Gleixner 2010-10-16 22:34:39 +02:00
parent 117bf5fbdb
commit 51dfacdef3
1 changed files with 4 additions and 4 deletions
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8
fs/jbd2/journal.c
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@ -1838,7 +1838,6 @@ size_t journal_tag_bytes(journal_t *journal)
*/
#define JBD2_MAX_SLABS 8
static struct kmem_cache *jbd2_slab[JBD2_MAX_SLABS];
static DECLARE_MUTEX(jbd2_slab_create_sem);
static const char *jbd2_slab_names[JBD2_MAX_SLABS] = {
"jbd2_1k", "jbd2_2k", "jbd2_4k", "jbd2_8k",
@ -1859,6 +1858,7 @@ static void jbd2_journal_destroy_slabs(void)
static int jbd2_journal_create_slab(size_t size)
{
static DEFINE_MUTEX(jbd2_slab_create_mutex);
int i = order_base_2(size) - 10;
size_t slab_size;
@ -1870,16 +1870,16 @@ static int jbd2_journal_create_slab(size_t size)
if (unlikely(i < 0))
i = 0;
down(&jbd2_slab_create_sem);
mutex_lock(&jbd2_slab_create_mutex);
if (jbd2_slab[i]) {
up(&jbd2_slab_create_sem);
mutex_unlock(&jbd2_slab_create_mutex);
return 0; /* Already created */
}
slab_size = 1 << (i+10);
jbd2_slab[i] = kmem_cache_create(jbd2_slab_names[i], slab_size,
slab_size, 0, NULL);
up(&jbd2_slab_create_sem);
mutex_unlock(&jbd2_slab_create_mutex);
if (!jbd2_slab[i]) {
printk(KERN_EMERG "JBD2: no memory for jbd2_slab cache\n");
return -ENOMEM;