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[PATCH] mutex subsystem, semaphore to completion: drivers/block/loop.c 

convert the block loop device from semaphores to completions.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Ingo Molnar 2006-01-09 15:59:27 -08:00 committed by Ingo Molnar
parent f36d4024ca
commit 11b751ae8c
2 changed files with 14 additions and 17 deletions
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27
drivers/block/loop.c
View File

@ -527,12 +527,12 @@ static int loop_make_request(request_queue_t *q, struct bio *old_bio)
lo->lo_pending++;
loop_add_bio(lo, old_bio);
spin_unlock_irq(&lo->lo_lock);
up(&lo->lo_bh_mutex);
complete(&lo->lo_bh_done);
return 0;
out:
if (lo->lo_pending == 0)
up(&lo->lo_bh_mutex);
complete(&lo->lo_bh_done);
spin_unlock_irq(&lo->lo_lock);
bio_io_error(old_bio, old_bio->bi_size);
return 0;
@ -593,23 +593,20 @@ static int loop_thread(void *data)
lo->lo_pending = 1;
/*
* up sem, we are running
* complete it, we are running
*/
up(&lo->lo_sem);
complete(&lo->lo_done);
for (;;) {
int pending;
/*
* interruptible just to not contribute to load avg
*/
if (down_interruptible(&lo->lo_bh_mutex))
if (wait_for_completion_interruptible(&lo->lo_bh_done))
continue;
spin_lock_irq(&lo->lo_lock);
/*
* could be upped because of tear-down, not pending work
* could be completed because of tear-down, not pending work
*/
if (unlikely(!lo->lo_pending)) {
spin_unlock_irq(&lo->lo_lock);
@ -632,7 +629,7 @@ static int loop_thread(void *data)
break;
}
up(&lo->lo_sem);
complete(&lo->lo_done);
return 0;
}
@ -843,7 +840,7 @@ static int loop_set_fd(struct loop_device *lo, struct file *lo_file,
set_blocksize(bdev, lo_blocksize);
kernel_thread(loop_thread, lo, CLONE_KERNEL);
down(&lo->lo_sem);
wait_for_completion(&lo->lo_done);
return 0;
out_putf:
@ -909,10 +906,10 @@ static int loop_clr_fd(struct loop_device *lo, struct block_device *bdev)
lo->lo_state = Lo_rundown;
lo->lo_pending--;
if (!lo->lo_pending)
up(&lo->lo_bh_mutex);
complete(&lo->lo_bh_done);
spin_unlock_irq(&lo->lo_lock);
down(&lo->lo_sem);
wait_for_completion(&lo->lo_done);
lo->lo_backing_file = NULL;
@ -1289,8 +1286,8 @@ static int __init loop_init(void)
if (!lo->lo_queue)
goto out_mem4;
init_MUTEX(&lo->lo_ctl_mutex);
init_MUTEX_LOCKED(&lo->lo_sem);
init_MUTEX_LOCKED(&lo->lo_bh_mutex);
init_completion(&lo->lo_done);
init_completion(&lo->lo_bh_done);
lo->lo_number = i;
spin_lock_init(&lo->lo_lock);
disk->major = LOOP_MAJOR;

4
include/linux/loop.h
View File

@ -58,9 +58,9 @@ struct loop_device {
struct bio *lo_bio;
struct bio *lo_biotail;
int lo_state;
struct semaphore lo_sem;
struct completion lo_done;
struct completion lo_bh_done;
struct semaphore lo_ctl_mutex;
struct semaphore lo_bh_mutex;
int lo_pending;
request_queue_t *lo_queue;