From c5ecc484c528ff50bdbb16fbfbac758ee368b329 Mon Sep 17 00:00:00 2001 From: Akinobu Mita Date: Wed, 24 Feb 2010 08:30:08 +0100 Subject: pktcdvd: use BIO list management functions Now that the bio list management stuff is generic, convert pktcdvd to use bio lists instead of its own private bio list implementation. Signed-off-by: Akinobu Mita Acked-by: Peter Osterlund Cc: Christoph Hellwig Signed-off-by: Jens Axboe --- drivers/block/pktcdvd.c | 89 ++++++++++++------------------------------------- include/linux/pktcdvd.h | 10 +++--- 2 files changed, 25 insertions(+), 74 deletions(-) diff --git a/drivers/block/pktcdvd.c b/drivers/block/pktcdvd.c index 68b5957f107c..7cd2973ebb7b 100644 --- a/drivers/block/pktcdvd.c +++ b/drivers/block/pktcdvd.c @@ -569,6 +569,7 @@ static struct packet_data *pkt_alloc_packet_data(int frames) } spin_lock_init(&pkt->lock); + bio_list_init(&pkt->orig_bios); for (i = 0; i < frames; i++) { struct bio *bio = pkt_bio_alloc(1); @@ -720,43 +721,6 @@ static void pkt_rbtree_insert(struct pktcdvd_device *pd, struct pkt_rb_node *nod pd->bio_queue_size++; } -/* - * Add a bio to a single linked list defined by its head and tail pointers. - */ -static void pkt_add_list_last(struct bio *bio, struct bio **list_head, struct bio **list_tail) -{ - bio->bi_next = NULL; - if (*list_tail) { - BUG_ON((*list_head) == NULL); - (*list_tail)->bi_next = bio; - (*list_tail) = bio; - } else { - BUG_ON((*list_head) != NULL); - (*list_head) = bio; - (*list_tail) = bio; - } -} - -/* - * Remove and return the first bio from a single linked list defined by its - * head and tail pointers. - */ -static inline struct bio *pkt_get_list_first(struct bio **list_head, struct bio **list_tail) -{ - struct bio *bio; - - if (*list_head == NULL) - return NULL; - - bio = *list_head; - *list_head = bio->bi_next; - if (*list_head == NULL) - *list_tail = NULL; - - bio->bi_next = NULL; - return bio; -} - /* * Send a packet_command to the underlying block device and * wait for completion. @@ -876,13 +840,10 @@ static noinline_for_stack int pkt_set_speed(struct pktcdvd_device *pd, static void pkt_queue_bio(struct pktcdvd_device *pd, struct bio *bio) { spin_lock(&pd->iosched.lock); - if (bio_data_dir(bio) == READ) { - pkt_add_list_last(bio, &pd->iosched.read_queue, - &pd->iosched.read_queue_tail); - } else { - pkt_add_list_last(bio, &pd->iosched.write_queue, - &pd->iosched.write_queue_tail); - } + if (bio_data_dir(bio) == READ) + bio_list_add(&pd->iosched.read_queue, bio); + else + bio_list_add(&pd->iosched.write_queue, bio); spin_unlock(&pd->iosched.lock); atomic_set(&pd->iosched.attention, 1); @@ -917,8 +878,8 @@ static void pkt_iosched_process_queue(struct pktcdvd_device *pd) int reads_queued, writes_queued; spin_lock(&pd->iosched.lock); - reads_queued = (pd->iosched.read_queue != NULL); - writes_queued = (pd->iosched.write_queue != NULL); + reads_queued = !bio_list_empty(&pd->iosched.read_queue); + writes_queued = !bio_list_empty(&pd->iosched.write_queue); spin_unlock(&pd->iosched.lock); if (!reads_queued && !writes_queued) @@ -927,7 +888,7 @@ static void pkt_iosched_process_queue(struct pktcdvd_device *pd) if (pd->iosched.writing) { int need_write_seek = 1; spin_lock(&pd->iosched.lock); - bio = pd->iosched.write_queue; + bio = bio_list_peek(&pd->iosched.write_queue); spin_unlock(&pd->iosched.lock); if (bio && (bio->bi_sector == pd->iosched.last_write)) need_write_seek = 0; @@ -950,13 +911,10 @@ static void pkt_iosched_process_queue(struct pktcdvd_device *pd) } spin_lock(&pd->iosched.lock); - if (pd->iosched.writing) { - bio = pkt_get_list_first(&pd->iosched.write_queue, - &pd->iosched.write_queue_tail); - } else { - bio = pkt_get_list_first(&pd->iosched.read_queue, - &pd->iosched.read_queue_tail); - } + if (pd->iosched.writing) + bio = bio_list_pop(&pd->iosched.write_queue); + else + bio = bio_list_pop(&pd->iosched.read_queue); spin_unlock(&pd->iosched.lock); if (!bio) @@ -1114,7 +1072,7 @@ static void pkt_gather_data(struct pktcdvd_device *pd, struct packet_data *pkt) int f; char written[PACKET_MAX_SIZE]; - BUG_ON(!pkt->orig_bios); + BUG_ON(bio_list_empty(&pkt->orig_bios)); atomic_set(&pkt->io_wait, 0); atomic_set(&pkt->io_errors, 0); @@ -1124,7 +1082,7 @@ static void pkt_gather_data(struct pktcdvd_device *pd, struct packet_data *pkt) */ memset(written, 0, sizeof(written)); spin_lock(&pkt->lock); - for (bio = pkt->orig_bios; bio; bio = bio->bi_next) { + bio_list_for_each(bio, &pkt->orig_bios) { int first_frame = (bio->bi_sector - pkt->sector) / (CD_FRAMESIZE >> 9); int num_frames = bio->bi_size / CD_FRAMESIZE; pd->stats.secs_w += num_frames * (CD_FRAMESIZE >> 9); @@ -1363,7 +1321,7 @@ try_next_bio: break; pkt_rbtree_erase(pd, node); spin_lock(&pkt->lock); - pkt_add_list_last(bio, &pkt->orig_bios, &pkt->orig_bios_tail); + bio_list_add(&pkt->orig_bios, bio); pkt->write_size += bio->bi_size / CD_FRAMESIZE; spin_unlock(&pkt->lock); } @@ -1409,7 +1367,7 @@ static void pkt_start_write(struct pktcdvd_device *pd, struct packet_data *pkt) */ frames_write = 0; spin_lock(&pkt->lock); - for (bio = pkt->orig_bios; bio; bio = bio->bi_next) { + bio_list_for_each(bio, &pkt->orig_bios) { int segment = bio->bi_idx; int src_offs = 0; int first_frame = (bio->bi_sector - pkt->sector) / (CD_FRAMESIZE >> 9); @@ -1472,20 +1430,14 @@ static void pkt_start_write(struct pktcdvd_device *pd, struct packet_data *pkt) static void pkt_finish_packet(struct packet_data *pkt, int uptodate) { - struct bio *bio, *next; + struct bio *bio; if (!uptodate) pkt->cache_valid = 0; /* Finish all bios corresponding to this packet */ - bio = pkt->orig_bios; - while (bio) { - next = bio->bi_next; - bio->bi_next = NULL; + while ((bio = bio_list_pop(&pkt->orig_bios))) bio_endio(bio, uptodate ? 0 : -EIO); - bio = next; - } - pkt->orig_bios = pkt->orig_bios_tail = NULL; } static void pkt_run_state_machine(struct pktcdvd_device *pd, struct packet_data *pkt) @@ -2567,8 +2519,7 @@ static int pkt_make_request(struct request_queue *q, struct bio *bio) spin_lock(&pkt->lock); if ((pkt->state == PACKET_WAITING_STATE) || (pkt->state == PACKET_READ_WAIT_STATE)) { - pkt_add_list_last(bio, &pkt->orig_bios, - &pkt->orig_bios_tail); + bio_list_add(&pkt->orig_bios, bio); pkt->write_size += bio->bi_size / CD_FRAMESIZE; if ((pkt->write_size >= pkt->frames) && (pkt->state == PACKET_WAITING_STATE)) { @@ -2898,6 +2849,8 @@ static int pkt_setup_dev(dev_t dev, dev_t* pkt_dev) spin_lock_init(&pd->lock); spin_lock_init(&pd->iosched.lock); + bio_list_init(&pd->iosched.read_queue); + bio_list_init(&pd->iosched.write_queue); sprintf(pd->name, DRIVER_NAME"%d", idx); init_waitqueue_head(&pd->wqueue); pd->bio_queue = RB_ROOT; diff --git a/include/linux/pktcdvd.h b/include/linux/pktcdvd.h index 76e5053e1fac..721301b0a908 100644 --- a/include/linux/pktcdvd.h +++ b/include/linux/pktcdvd.h @@ -163,10 +163,8 @@ struct packet_iosched atomic_t attention; /* Set to non-zero when queue processing is needed */ int writing; /* Non-zero when writing, zero when reading */ spinlock_t lock; /* Protecting read/write queue manipulations */ - struct bio *read_queue; - struct bio *read_queue_tail; - struct bio *write_queue; - struct bio *write_queue_tail; + struct bio_list read_queue; + struct bio_list write_queue; sector_t last_write; /* The sector where the last write ended */ int successive_reads; }; @@ -206,8 +204,8 @@ struct packet_data spinlock_t lock; /* Lock protecting state transitions and */ /* orig_bios list */ - struct bio *orig_bios; /* Original bios passed to pkt_make_request */ - struct bio *orig_bios_tail;/* that will be handled by this packet */ + struct bio_list orig_bios; /* Original bios passed to pkt_make_request */ + /* that will be handled by this packet */ int write_size; /* Total size of all bios in the orig_bios */ /* list, measured in number of frames */ -- cgit v1.2.3