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loop: use BIO list management functions 

Now that the bio list management stuff is generic, convert loop to use
bio lists instead of its own private bio list implementation.

Cc:  Jens Axboe <axboe@kernel.dk>
Cc: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Akinobu Mita 2009-04-17 08:41:21 +02:00 committed by Jens Axboe
parent e93b9fb7d8
commit e686307fdc
3 changed files with 9 additions and 22 deletions
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26
drivers/block/loop.c
View File

@ -511,11 +511,7 @@ out:
*/
static void loop_add_bio(struct loop_device *lo, struct bio *bio)
{
if (lo->lo_biotail) {
lo->lo_biotail->bi_next = bio;
lo->lo_biotail = bio;
} else
lo->lo_bio = lo->lo_biotail = bio;
bio_list_add(&lo->lo_bio_list, bio);
}
/*
@ -523,16 +519,7 @@ static void loop_add_bio(struct loop_device *lo, struct bio *bio)
*/
static struct bio *loop_get_bio(struct loop_device *lo)
{
struct bio *bio;
if ((bio = lo->lo_bio)) {
if (bio == lo->lo_biotail)
lo->lo_biotail = NULL;
lo->lo_bio = bio->bi_next;
bio->bi_next = NULL;
}
return bio;
return bio_list_pop(&lo->lo_bio_list);
}
static int loop_make_request(struct request_queue *q, struct bio *old_bio)
@ -609,12 +596,13 @@ static int loop_thread(void *data)
set_user_nice(current, -20);
while (!kthread_should_stop() || lo->lo_bio) {
while (!kthread_should_stop() || !bio_list_empty(&lo->lo_bio_list)) {
wait_event_interruptible(lo->lo_event,
lo->lo_bio || kthread_should_stop());
!bio_list_empty(&lo->lo_bio_list) ||
kthread_should_stop());
if (!lo->lo_bio)
if (bio_list_empty(&lo->lo_bio_list))
continue;
spin_lock_irq(&lo->lo_lock);
bio = loop_get_bio(lo);
@ -841,7 +829,7 @@ static int loop_set_fd(struct loop_device *lo, fmode_t mode,
lo->old_gfp_mask = mapping_gfp_mask(mapping);
mapping_set_gfp_mask(mapping, lo->old_gfp_mask & ~(__GFP_IO|__GFP_FS));
lo->lo_bio = lo->lo_biotail = NULL;
bio_list_init(&lo->lo_bio_list);
/*
* set queue make_request_fn, and add limits based on lower level

2
include/linux/bio.h
View File

@ -506,7 +506,7 @@ static inline int bio_has_data(struct bio *bio)
}
/*
* BIO list managment for use by remapping drivers (e.g. DM or MD).
* BIO list management for use by remapping drivers (e.g. DM or MD) and loop.
*
* A bio_list anchors a singly-linked list of bios chained through the bi_next
* member of the bio. The bio_list also caches the last list member to allow

3
include/linux/loop.h
View File

@ -56,8 +56,7 @@ struct loop_device {
gfp_t old_gfp_mask;
spinlock_t lo_lock;
struct bio *lo_bio;
struct bio *lo_biotail;
struct bio_list lo_bio_list;
int lo_state;
struct mutex lo_ctl_mutex;
struct task_struct *lo_thread;