diff options
Diffstat (limited to 'block')
| -rw-r--r-- | block/Kconfig | 12 | ||||
| -rw-r--r-- | block/Makefile | 4 | ||||
| -rw-r--r-- | block/as-iosched.c | 37 | ||||
| -rw-r--r-- | block/blk-barrier.c | 72 | ||||
| -rw-r--r-- | block/blk-core.c | 663 | ||||
| -rw-r--r-- | block/blk-exec.c | 12 | ||||
| -rw-r--r-- | block/blk-integrity.c | 382 | ||||
| -rw-r--r-- | block/blk-map.c | 68 | ||||
| -rw-r--r-- | block/blk-merge.c | 132 | ||||
| -rw-r--r-- | block/blk-settings.c | 67 | ||||
| -rw-r--r-- | block/blk-softirq.c | 175 | ||||
| -rw-r--r-- | block/blk-sysfs.c | 35 | ||||
| -rw-r--r-- | block/blk-tag.c | 28 | ||||
| -rw-r--r-- | block/blk-timeout.c | 238 | ||||
| -rw-r--r-- | block/blk.h | 56 | ||||
| -rw-r--r-- | block/blktrace.c | 77 | ||||
| -rw-r--r-- | block/bsg.c | 59 | ||||
| -rw-r--r-- | block/cfq-iosched.c | 140 | ||||
| -rw-r--r-- | block/cmd-filter.c | 232 | ||||
| -rw-r--r-- | block/compat_ioctl.c | 1 | ||||
| -rw-r--r-- | block/deadline-iosched.c | 40 | ||||
| -rw-r--r-- | block/elevator.c | 48 | ||||
| -rw-r--r-- | block/genhd.c | 925 | ||||
| -rw-r--r-- | block/ioctl.c | 127 | ||||
| -rw-r--r-- | block/scsi_ioctl.c | 215 |
25 files changed, 2856 insertions, 989 deletions
diff --git a/block/Kconfig b/block/Kconfig index 3e97f2bc446f..1ab7c15c8d7a 100644 --- a/block/Kconfig +++ b/block/Kconfig @@ -81,6 +81,18 @@ config BLK_DEV_BSG If unsure, say N. +config BLK_DEV_INTEGRITY + bool "Block layer data integrity support" + ---help--- + Some storage devices allow extra information to be + stored/retrieved to help protect the data. The block layer + data integrity option provides hooks which can be used by + filesystems to ensure better data integrity. + + Say yes here if you have a storage device that provides the + T10/SCSI Data Integrity Field or the T13/ATA External Path + Protection. If in doubt, say N. + endif # BLOCK config BLOCK_COMPAT diff --git a/block/Makefile b/block/Makefile index 5a43c7d79594..bfe73049f939 100644 --- a/block/Makefile +++ b/block/Makefile @@ -4,7 +4,8 @@ obj-$(CONFIG_BLOCK) := elevator.o blk-core.o blk-tag.o blk-sysfs.o \ blk-barrier.o blk-settings.o blk-ioc.o blk-map.o \ - blk-exec.o blk-merge.o ioctl.o genhd.o scsi_ioctl.o + blk-exec.o blk-merge.o blk-softirq.o blk-timeout.o \ + ioctl.o genhd.o scsi_ioctl.o cmd-filter.o obj-$(CONFIG_BLK_DEV_BSG) += bsg.o obj-$(CONFIG_IOSCHED_NOOP) += noop-iosched.o @@ -14,3 +15,4 @@ obj-$(CONFIG_IOSCHED_CFQ) += cfq-iosched.o obj-$(CONFIG_BLK_DEV_IO_TRACE) += blktrace.o obj-$(CONFIG_BLOCK_COMPAT) += compat_ioctl.o +obj-$(CONFIG_BLK_DEV_INTEGRITY) += blk-integrity.o diff --git a/block/as-iosched.c b/block/as-iosched.c index 8c3946787dbb..71f0abb219ee 100644 --- a/block/as-iosched.c +++ b/block/as-iosched.c @@ -151,6 +151,7 @@ enum arq_state { static DEFINE_PER_CPU(unsigned long, ioc_count); static struct completion *ioc_gone; +static DEFINE_SPINLOCK(ioc_gone_lock); static void as_move_to_dispatch(struct as_data *ad, struct request *rq); static void as_antic_stop(struct as_data *ad); @@ -164,8 +165,19 @@ static void free_as_io_context(struct as_io_context *aic) { kfree(aic); elv_ioc_count_dec(ioc_count); - if (ioc_gone && !elv_ioc_count_read(ioc_count)) - complete(ioc_gone); + if (ioc_gone) { + /* + * AS scheduler is exiting, grab exit lock and check + * the pending io context count. If it hits zero, + * complete ioc_gone and set it back to NULL. + */ + spin_lock(&ioc_gone_lock); + if (ioc_gone && !elv_ioc_count_read(ioc_count)) { + complete(ioc_gone); + ioc_gone = NULL; + } + spin_unlock(&ioc_gone_lock); + } } static void as_trim(struct io_context *ioc) @@ -450,7 +462,7 @@ static void as_antic_stop(struct as_data *ad) del_timer(&ad->antic_timer); ad->antic_status = ANTIC_FINISHED; /* see as_work_handler */ - kblockd_schedule_work(&ad->antic_work); + kblockd_schedule_work(ad->q, &ad->antic_work); } } @@ -471,7 +483,7 @@ static void as_antic_timeout(unsigned long data) aic = ad->io_context->aic; ad->antic_status = ANTIC_FINISHED; - kblockd_schedule_work(&ad->antic_work); + kblockd_schedule_work(q, &ad->antic_work); if (aic->ttime_samples == 0) { /* process anticipated on has exited or timed out*/ @@ -733,6 +745,14 @@ static int as_can_break_anticipation(struct as_data *ad, struct request *rq) */ static int as_can_anticipate(struct as_data *ad, struct request *rq) { +#if 0 /* disable for now, we need to check tag level as well */ + /* + * SSD device without seek penalty, disable idling + */ + if (blk_queue_nonrot(ad->q)) axman + return 0; +#endif + if (!ad->io_context) /* * Last request submitted was a write @@ -825,13 +845,14 @@ static void as_completed_request(struct request_queue *q, struct request *rq) WARN_ON(!list_empty(&rq->queuelist)); if (RQ_STATE(rq) != AS_RQ_REMOVED) { - printk("rq->state %d\n", RQ_STATE(rq)); - WARN_ON(1); + WARN(1, "rq->state %d\n", RQ_STATE(rq)); goto out; } if (ad->changed_batch && ad->nr_dispatched == 1) { - kblockd_schedule_work(&ad->antic_work); + ad->current_batch_expires = jiffies + + ad->batch_expire[ad->batch_data_dir]; + kblockd_schedule_work(q, &ad->antic_work); ad->changed_batch = 0; if (ad->batch_data_dir == REQ_SYNC) @@ -1491,7 +1512,7 @@ static void __exit as_exit(void) /* ioc_gone's update must be visible before reading ioc_count */ smp_wmb(); if (elv_ioc_count_read(ioc_count)) - wait_for_completion(ioc_gone); + wait_for_completion(&all_gone); synchronize_rcu(); } diff --git a/block/blk-barrier.c b/block/blk-barrier.c index a09ead19f9c5..5c99ff8d2db8 100644 --- a/block/blk-barrier.c +++ b/block/blk-barrier.c @@ -293,7 +293,7 @@ int blkdev_issue_flush(struct block_device *bdev, sector_t *error_sector) bio->bi_end_io = bio_end_empty_barrier; bio->bi_private = &wait; bio->bi_bdev = bdev; - submit_bio(1 << BIO_RW_BARRIER, bio); + submit_bio(WRITE_BARRIER, bio); wait_for_completion(&wait); @@ -315,3 +315,73 @@ int blkdev_issue_flush(struct block_device *bdev, sector_t *error_sector) return ret; } EXPORT_SYMBOL(blkdev_issue_flush); + +static void blkdev_discard_end_io(struct bio *bio, int err) +{ + if (err) { + if (err == -EOPNOTSUPP) + set_bit(BIO_EOPNOTSUPP, &bio->bi_flags); + clear_bit(BIO_UPTODATE, &bio->bi_flags); + } + + bio_put(bio); +} + +/** + * blkdev_issue_discard - queue a discard + * @bdev: blockdev to issue discard for + * @sector: start sector + * @nr_sects: number of sectors to discard + * @gfp_mask: memory allocation flags (for bio_alloc) + * + * Description: + * Issue a discard request for the sectors in question. Does not wait. + */ +int blkdev_issue_discard(struct block_device *bdev, + sector_t sector, sector_t nr_sects, gfp_t gfp_mask) +{ + struct request_queue *q; + struct bio *bio; + int ret = 0; + + if (bdev->bd_disk == NULL) + return -ENXIO; + + q = bdev_get_queue(bdev); + if (!q) + return -ENXIO; + + if (!q->prepare_discard_fn) + return -EOPNOTSUPP; + + while (nr_sects && !ret) { + bio = bio_alloc(gfp_mask, 0); + if (!bio) + return -ENOMEM; + + bio->bi_end_io = blkdev_discard_end_io; + bio->bi_bdev = bdev; + + bio->bi_sector = sector; + + if (nr_sects > q->max_hw_sectors) { + bio->bi_size = q->max_hw_sectors << 9; + nr_sects -= q->max_hw_sectors; + sector += q->max_hw_sectors; + } else { + bio->bi_size = nr_sects << 9; + nr_sects = 0; + } + bio_get(bio); + submit_bio(DISCARD_BARRIER, bio); + + /* Check if it failed immediately */ + if (bio_flagged(bio, BIO_EOPNOTSUPP)) + ret = -EOPNOTSUPP; + else if (!bio_flagged(bio, BIO_UPTODATE)) + ret = -EIO; + bio_put(bio); + } + return ret; +} +EXPORT_SYMBOL(blkdev_issue_discard); diff --git a/block/blk-core.c b/block/blk-core.c index 1905aaba49fb..9e79a485e4f3 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -26,8 +26,6 @@ #include <linux/swap.h> #include <linux/writeback.h> #include <linux/task_io_accounting_ops.h> -#include <linux/interrupt.h> -#include <linux/cpu.h> #include <linux/blktrace_api.h> #include <linux/fault-inject.h> @@ -50,27 +48,26 @@ struct kmem_cache *blk_requestq_cachep; */ static struct workqueue_struct *kblockd_workqueue; -static DEFINE_PER_CPU(struct list_head, blk_cpu_done); - static void drive_stat_acct(struct request *rq, int new_io) { struct hd_struct *part; int rw = rq_data_dir(rq); + int cpu; if (!blk_fs_request(rq) || !rq->rq_disk) return; - part = get_part(rq->rq_disk, rq->sector); + cpu = part_stat_lock(); + part = disk_map_sector_rcu(rq->rq_disk, rq->sector); + if (!new_io) - __all_stat_inc(rq->rq_disk, part, merges[rw], rq->sector); + part_stat_inc(cpu, part, merges[rw]); else { - disk_round_stats(rq->rq_disk); - rq->rq_disk->in_flight++; - if (part) { - part_round_stats(part); - part->in_flight++; - } + part_round_stats(cpu, part); + part_inc_in_flight(part); } + + part_stat_unlock(); } void blk_queue_congestion_threshold(struct request_queue *q) @@ -113,7 +110,8 @@ void blk_rq_init(struct request_queue *q, struct request *rq) memset(rq, 0, sizeof(*rq)); INIT_LIST_HEAD(&rq->queuelist); - INIT_LIST_HEAD(&rq->donelist); + INIT_LIST_HEAD(&rq->timeout_list); + rq->cpu = -1; rq->q = q; rq->sector = rq->hard_sector = (sector_t) -1; INIT_HLIST_NODE(&rq->hash); @@ -143,6 +141,10 @@ static void req_bio_endio(struct request *rq, struct bio *bio, bio->bi_size -= nbytes; bio->bi_sector += (nbytes >> 9); + + if (bio_integrity(bio)) + bio_integrity_advance(bio, nbytes); + if (bio->bi_size == 0) bio_endio(bio, error); } else { @@ -201,14 +203,31 @@ void blk_plug_device(struct request_queue *q) if (blk_queue_stopped(q)) return; - if (!test_bit(QUEUE_FLAG_PLUGGED, &q->queue_flags)) { - __set_bit(QUEUE_FLAG_PLUGGED, &q->queue_flags); + if (!queue_flag_test_and_set(QUEUE_FLAG_PLUGGED, q)) { mod_timer(&q->unplug_timer, jiffies + q->unplug_delay); blk_add_trace_generic(q, NULL, 0, BLK_TA_PLUG); } } EXPORT_SYMBOL(blk_plug_device); +/** + * blk_plug_device_unlocked - plug a device without queue lock held + * @q: The &struct request_queue to plug + * + * Description: + * Like @blk_plug_device(), but grabs the queue lock and disables + * interrupts. + **/ +void blk_plug_device_unlocked(struct request_queue *q) +{ + unsigned long flags; + + spin_lock_irqsave(q->queue_lock, flags); + blk_plug_device(q); + spin_unlock_irqrestore(q->queue_lock, flags); +} +EXPORT_SYMBOL(blk_plug_device_unlocked); + /* * remove the queue from the plugged list, if present. called with * queue lock held and interrupts disabled. @@ -217,10 +236,9 @@ int blk_remove_plug(struct request_queue *q) { WARN_ON(!irqs_disabled()); - if (!test_bit(QUEUE_FLAG_PLUGGED, &q->queue_flags)) + if (!queue_flag_test_and_clear(QUEUE_FLAG_PLUGGED, q)) return 0; - queue_flag_clear(QUEUE_FLAG_PLUGGED, q); del_timer(&q->unplug_timer); return 1; } @@ -288,7 +306,7 @@ void blk_unplug_timeout(unsigned long data) blk_add_trace_pdu_int(q, BLK_TA_UNPLUG_TIMER, NULL, q->rq.count[READ] + q->rq.count[WRITE]); - kblockd_schedule_work(&q->unplug_work); + kblockd_schedule_work(q, &q->unplug_work); } void blk_unplug(struct request_queue *q) @@ -305,6 +323,21 @@ void blk_unplug(struct request_queue *q) } EXPORT_SYMBOL(blk_unplug); +static void blk_invoke_request_fn(struct request_queue *q) +{ + /* + * one level of recursion is ok and is much faster than kicking + * the unplug handling + */ + if (!queue_flag_test_and_set(QUEUE_FLAG_REENTER, q)) { + q->request_fn(q); + queue_flag_clear(QUEUE_FLAG_REENTER, q); + } else { + queue_flag_set(QUEUE_FLAG_PLUGGED, q); + kblockd_schedule_work(q, &q->unplug_work); + } +} + /** * blk_start_queue - restart a previously stopped queue * @q: The &struct request_queue in question @@ -319,19 +352,7 @@ void blk_start_queue(struct request_queue *q) WARN_ON(!irqs_disabled()); queue_flag_clear(QUEUE_FLAG_STOPPED, q); - - /* - * one level of recursion is ok and is much faster than kicking - * the unplug handling - */ - if (!test_bit(QUEUE_FLAG_REENTER, &q->queue_flags)) { - queue_flag_set(QUEUE_FLAG_REENTER, q); - q->request_fn(q); - queue_flag_clear(QUEUE_FLAG_REENTER, q); - } else { - blk_plug_device(q); - kblockd_schedule_work(&q->unplug_work); - } + blk_invoke_request_fn(q); } EXPORT_SYMBOL(blk_start_queue); @@ -389,16 +410,8 @@ void __blk_run_queue(struct request_queue *q) * Only recurse once to avoid overrunning the stack, let the unplug * handling reinvoke the handler shortly if we already got there. */ - if (!elv_queue_empty(q)) { - if (!test_bit(QUEUE_FLAG_REENTER, &q->queue_flags)) { - queue_flag_set(QUEUE_FLAG_REENTER, q); - q->request_fn(q); - queue_flag_clear(QUEUE_FLAG_REENTER, q); - } else { - blk_plug_device(q); - kblockd_schedule_work(&q->unplug_work); - } - } + if (!elv_queue_empty(q)) + blk_invoke_request_fn(q); } EXPORT_SYMBOL(__blk_run_queue); @@ -423,6 +436,14 @@ void blk_put_queue(struct request_queue *q) void blk_cleanup_queue(struct request_queue *q) { + /* + * We know we have process context here, so we can be a little + * cautious and ensure that pending block actions on this device + * are done before moving on. Going into this function, we should + * not have processes doing IO to this device. + */ + blk_sync_queue(q); + mutex_lock(&q->sysfs_lock); queue_flag_set_unlocked(QUEUE_FLAG_DEAD, q); mutex_unlock(&q->sysfs_lock); @@ -478,6 +499,8 @@ struct request_queue *blk_alloc_queue_node(gfp_t gfp_mask, int node_id) } init_timer(&q->unplug_timer); + setup_timer(&q->timeout, blk_rq_timed_out_timer, (unsigned long) q); + INIT_LIST_HEAD(&q->timeout_list); kobject_init(&q->kobj, &blk_queue_ktype); @@ -513,7 +536,7 @@ EXPORT_SYMBOL(blk_alloc_queue_node); * request queue; this lock will be taken also from interrupt context, so irq * disabling is needed for it. * - * Function returns a pointer to the initialized request queue, or NULL if + * Function returns a pointer to the initialized request queue, or %NULL if * it didn't succeed. * * Note: @@ -551,7 +574,8 @@ blk_init_queue_node(request_fn_proc *rfn, spinlock_t *lock, int node_id) q->request_fn = rfn; q->prep_rq_fn = NULL; q->unplug_fn = generic_unplug_device; - q->queue_flags = (1 << QUEUE_FLAG_CLUSTER); + q->queue_flags = (1 << QUEUE_FLAG_CLUSTER | + 1 << QUEUE_FLAG_STACKABLE); q->queue_lock = lock; blk_queue_segment_boundary(q, 0xffffffff); @@ -564,6 +588,8 @@ blk_init_queue_node(request_fn_proc *rfn, spinlock_t *lock, int node_id) q->sg_reserved_size = INT_MAX; + blk_set_cmd_filter_defaults(&q->cmd_filter); + /* * all done */ @@ -604,10 +630,6 @@ blk_alloc_request(struct request_queue *q, int rw, int priv, gfp_t gfp_mask) blk_rq_init(q, rq); - /* - * first three bits are identical in rq->cmd_flags and bio->bi_rw, - * see bio.h and blkdev.h - */ rq->cmd_flags = rw | REQ_ALLOCED; if (priv) { @@ -868,9 +890,11 @@ EXPORT_SYMBOL(blk_get_request); */ void blk_start_queueing(struct request_queue *q) { - if (!blk_queue_plugged(q)) + if (!blk_queue_plugged(q)) { + if (unlikely(blk_queue_stopped(q))) + return; q->request_fn(q); - else + } else __generic_unplug_device(q); } EXPORT_SYMBOL(blk_start_queueing); @@ -887,6 +911,8 @@ EXPORT_SYMBOL(blk_start_queueing); */ void blk_requeue_request(struct request_queue *q, struct request *rq) { + blk_delete_timer(rq); + blk_clear_rq_complete(rq); blk_add_trace_rq(q, rq, BLK_TA_REQUEUE); if (blk_rq_tagged(rq)) @@ -897,7 +923,7 @@ void blk_requeue_request(struct request_queue *q, struct request *rq) EXPORT_SYMBOL(blk_requeue_request); /** - * blk_insert_request - insert a special request in to a request queue + * blk_insert_request - insert a special request into a request queue * @q: request queue where request should be inserted * @rq: request to be inserted * @at_head: insert request at head or tail of queue @@ -907,8 +933,8 @@ EXPORT_SYMBOL(blk_requeue_request); * Many block devices need to execute commands asynchronously, so they don't * block the whole kernel from preemption during request execution. This is * accomplished normally by inserting aritficial requests tagged as - * REQ_SPECIAL in to the corresponding request queue, and letting them be - * scheduled for actual execution by the request queue. + * REQ_TYPE_SPECIAL in to the corresponding request queue, and letting them + * be scheduled for actual execution by the request queue. * * We have the option of inserting the head or the tail of the queue. * Typically we use the tail for new ioctls and so forth. We use the head @@ -962,8 +988,22 @@ static inline void add_request(struct request_queue *q, struct request *req) __elv_add_request(q, req, ELEVATOR_INSERT_SORT, 0); } -/* - * disk_round_stats() - Round off the performance stats on a struct +static void part_round_stats_single(int cpu, struct hd_struct *part, + unsigned long now) +{ + if (now == part->stamp) + return; + + if (part->in_flight) { + __part_stat_add(cpu, part, time_in_queue, + part->in_flight * (now - part->stamp)); + __part_stat_add(cpu, part, io_ticks, (now - part->stamp)); + } + part->stamp = now; +} + +/** + * part_round_stats() - Round off the performance stats on a struct * disk_stats. * * The average IO queue length and utilisation statistics are maintained @@ -977,36 +1017,15 @@ static inline void add_request(struct request_queue *q, struct request *req) * /proc/diskstats. This accounts immediately for all queue usage up to * the current jiffies and restarts the counters again. */ -void disk_round_stats(struct gendisk *disk) -{ - unsigned long now = jiffies; - - if (now == disk->stamp) - return; - - if (disk->in_flight) { - __disk_stat_add(disk, time_in_queue, - disk->in_flight * (now - disk->stamp)); - __disk_stat_add(disk, io_ticks, (now - disk->stamp)); - } - disk->stamp = now; -} -EXPORT_SYMBOL_GPL(disk_round_stats); - -void part_round_stats(struct hd_struct *part) +void part_round_stats(int cpu, struct hd_struct *part) { unsigned long now = jiffies; - if (now == part->stamp) - return; - - if (part->in_flight) { - __part_stat_add(part, time_in_queue, - part->in_flight * (now - part->stamp)); - __part_stat_add(part, io_ticks, (now - part->stamp)); - } - part->stamp = now; + if (part->partno) + part_round_stats_single(cpu, &part_to_disk(part)->part0, now); + part_round_stats_single(cpu, part, now); } +EXPORT_SYMBOL_GPL(part_round_stats); /* * queue lock must be held @@ -1042,32 +1061,39 @@ void blk_put_request(struct request *req) unsigned long flags; struct request_queue *q = req->q; - /* - * Gee, IDE calls in w/ NULL q. Fix IDE and remove the - * following if (q) test. - */ - if (q) { - spin_lock_irqsave(q->queue_lock, flags); - __blk_put_request(q, req); - spin_unlock_irqrestore(q->queue_lock, flags); - } + spin_lock_irqsave(q->queue_lock, flags); + __blk_put_request(q, req); + spin_unlock_irqrestore(q->queue_lock, flags); } EXPORT_SYMBOL(blk_put_request); void init_request_from_bio(struct request *req, struct bio *bio) { + req->cpu = bio->bi_comp_cpu; req->cmd_type = REQ_TYPE_FS; /* * inherit FAILFAST from bio (for read-ahead, and explicit FAILFAST) */ - if (bio_rw_ahead(bio) || bio_failfast(bio)) - req->cmd_flags |= REQ_FAILFAST; + if (bio_rw_ahead(bio)) + req->cmd_flags |= (REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT | + REQ_FAILFAST_DRIVER); + if (bio_failfast_dev(bio)) + req->cmd_flags |= REQ_FAILFAST_DEV; + if (bio_failfast_transport(bio)) + req->cmd_flags |= REQ_FAILFAST_TRANSPORT; + if (bio_failfast_driver(bio)) + req->cmd_flags |= REQ_FAILFAST_DRIVER; /* * REQ_BARRIER implies no merging, but lets make it explicit */ - if (unlikely(bio_barrier(bio))) + if (unlikely(bio_discard(bio))) { + req->cmd_flags |= REQ_DISCARD; + if (bio_barrier(bio)) + req->cmd_flags |= REQ_SOFTBARRIER; + req->q->prepare_discard_fn(req->q, req); + } else if (unlikely(bio_barrier(bio))) req->cmd_flags |= (REQ_HARDBARRIER | REQ_NOMERGE); if (bio_sync(bio)) @@ -1085,7 +1111,7 @@ void init_request_from_bio(struct request *req, struct bio *bio) static int __make_request(struct request_queue *q, struct bio *bio) { struct request *req; - int el_ret, nr_sectors, barrier, err; + int el_ret, nr_sectors, barrier, discard, err; const unsigned short prio = bio_prio(bio); const int sync = bio_sync(bio); int rw_flags; @@ -1100,7 +1126,14 @@ static int __make_request(struct request_queue *q, struct bio *bio) blk_queue_bounce(q, &bio); barrier = bio_barrier(bio); - if (unlikely(barrier) && (q->next_ordered == QUEUE_ORDERED_NONE)) { + if (unlikely(barrier) && bio_has_data(bio) && + (q->next_ordered == QUEUE_ORDERED_NONE)) { + err = -EOPNOTSUPP; + goto end_io; + } + + discard = bio_discard(bio); + if (unlikely(discard) && !q->prepare_discard_fn) { err = -EOPNOTSUPP; goto end_io; } @@ -1124,6 +1157,8 @@ static int __make_request(struct request_queue *q, struct bio *bio) req->biotail = bio; req->nr_sectors = req->hard_nr_sectors += nr_sectors; req->ioprio = ioprio_best(req->ioprio, prio); + if (!blk_rq_cpu_valid(req)) + req->cpu = bio->bi_comp_cpu; drive_stat_acct(req, 0); if (!attempt_back_merge(q, req)) elv_merged_request(q, req, el_ret); @@ -1151,6 +1186,8 @@ static int __make_request(struct request_queue *q, struct bio *bio) req->sector = req->hard_sector = bio->bi_sector; req->nr_sectors = req->hard_nr_sectors += nr_sectors; req->ioprio = ioprio_best(req->ioprio, prio); + if (!blk_rq_cpu_valid(req)) + req->cpu = bio->bi_comp_cpu; drive_stat_acct(req, 0); if (!attempt_front_merge(q, req)) elv_merged_request(q, req, el_ret); @@ -1186,13 +1223,15 @@ get_rq: init_request_from_bio(req, bio); spin_lock_irq(q->queue_lock); + if (test_bit(QUEUE_FLAG_SAME_COMP, &q->queue_flags) || + bio_flagged(bio, BIO_CPU_AFFINE)) + req->cpu = blk_cpu_to_group(smp_processor_id()); if (elv_queue_empty(q)) blk_plug_device(q); add_request(q, req); out: if (sync) __generic_unplug_device(q); - spin_unlock_irq(q->queue_lock); return 0; @@ -1246,8 +1285,9 @@ __setup("fail_make_request=", setup_fail_make_request); static int should_fail_request(struct bio *bio) { - if ((bio->bi_bdev->bd_disk->flags & GENHD_FL_FAIL) || - (bio->bi_bdev->bd_part && bio->bi_bdev->bd_part->make_it_fail)) + struct hd_struct *part = bio->bi_bdev->bd_part; + + if (part_to_disk(part)->part0.make_it_fail || part->make_it_fail) return should_fail(&fail_make_request, bio->bi_size); return 0; @@ -1300,7 +1340,7 @@ static inline int bio_check_eod(struct bio *bio, unsigned int nr_sectors) } /** - * generic_make_request: hand a buffer to its device driver for I/O + * generic_make_request - hand a buffer to its device driver for I/O * @bio: The bio describing the location in memory and on the device. * * generic_make_request() is used to make I/O requests of block @@ -1381,6 +1421,9 @@ end_io: */ blk_partition_remap(bio); + if (bio_integrity_enabled(bio) && bio_integrity_prep(bio)) + goto end_io; + if (old_sector != -1) blk_add_trace_remap(q, bio, old_dev, bio->bi_sector, old_sector); @@ -1392,7 +1435,8 @@ end_io: if (bio_check_eod(bio, nr_sectors)) goto end_io; - if (bio_empty_barrier(bio) && !q->prepare_flush_fn) { + if ((bio_empty_barrier(bio) && !q->prepare_flush_fn) || + (bio_discard(bio) && !q->prepare_discard_fn)) { err = -EOPNOTSUPP; goto end_io; } @@ -1454,13 +1498,13 @@ void generic_make_request(struct bio *bio) EXPORT_SYMBOL(generic_make_request); /** - * submit_bio: submit a bio to the block device layer for I/O + * submit_bio - submit a bio to the block device layer for I/O * @rw: whether to %READ or %WRITE, or maybe to %READA (read ahead) * @bio: The &struct bio which describes the I/O * * submit_bio() is very similar in purpose to generic_make_request(), and * uses that function to do most of the work. Both are fairly rough - * interfaces, @bio must be presetup and ready for I/O. + * interfaces; @bio must be presetup and ready for I/O. * */ void submit_bio(int rw, struct bio *bio) @@ -1473,11 +1517,7 @@ void submit_bio(int rw, struct bio *bio) * If it's a regular read/write or a barrier with data attached, * go through the normal accounting stuff before submission. */ - if (!bio_empty_barrier(bio)) { - - BIO_BUG_ON(!bio->bi_size); - BIO_BUG_ON(!bio->bi_io_vec); - + if (bio_has_data(bio)) { if (rw & WRITE) { count_vm_events(PGPGOUT, count); } else { @@ -1500,9 +1540,90 @@ void submit_bio(int rw, struct bio *bio) EXPORT_SYMBOL(submit_bio); /** + * blk_rq_check_limits - Helper function to check a request for the queue limit + * @q: the queue + * @rq: the request being checked + * + * Description: + * @rq may have been made based on weaker limitations of upper-level queues + * in request stacking drivers, and it may violate the limitation of @q. + * Since the block layer and the underlying device driver trust @rq + * after it is inserted to @q, it should be checked against @q before + * the insertion using this generic function. + * + * This function should also be useful for request stacking drivers + * in some cases below, so export this fuction. + * Request stacking drivers like request-based dm may change the queue + * limits while requests are in the queue (e.g. dm's table swapping). + * Such request stacking drivers should check those requests agaist + * the new queue limits again when they dispatch those requests, + * although such checkings are also done against the old queue limits + * when submitting requests. + */ +int blk_rq_check_limits(struct request_queue *q, struct request *rq) +{ + if (rq->nr_sectors > q->max_sectors || + rq->data_len > q->max_hw_sectors << 9) { + printk(KERN_ERR "%s: over max size limit.\n", __func__); + return -EIO; + } + + /* + * queue's settings related to segment counting like q->bounce_pfn + * may differ from that of other stacking queues. + * Recalculate it to check the request correctly on this queue's + * limitation. + */ + blk_recalc_rq_segments(rq); + if (rq->nr_phys_segments > q->max_phys_segments || + rq->nr_phys_segments > q->max_hw_segments) { + printk(KERN_ERR "%s: over max segments limit.\n", __func__); + return -EIO; + } + + return 0; +} +EXPORT_SYMBOL_GPL(blk_rq_check_limits); + +/** + * blk_insert_cloned_request - Helper for stacking drivers to submit a request + * @q: the queue to submit the request + * @rq: the request being queued + */ +int blk_insert_cloned_request(struct request_queue *q, struct request *rq) +{ + unsigned long flags; + + if (blk_rq_check_limits(q, rq)) + return -EIO; + +#ifdef CONFIG_FAIL_MAKE_REQUEST + if (rq->rq_disk && rq->rq_disk->part0.make_it_fail && + should_fail(&fail_make_request, blk_rq_bytes(rq))) + return -EIO; +#endif + + spin_lock_irqsave(q->queue_lock, flags); + + /* + * Submitting request must be dequeued before calling this function + * because it will be linked to another request_queue + */ + BUG_ON(blk_queued_rq(rq)); + + drive_stat_acct(rq, 1); + __elv_add_request(q, rq, ELEVATOR_INSERT_BACK, 0); + + spin_unlock_irqrestore(q->queue_lock, flags); + + return 0; +} +EXPORT_SYMBOL_GPL(blk_insert_cloned_request); + +/** * __end_that_request_first - end I/O on a request * @req: the request being processed - * @error: 0 for success, < 0 for error + * @error: %0 for success, < %0 for error * @nr_bytes: number of bytes to complete * * Description: @@ -1510,8 +1631,8 @@ EXPORT_SYMBOL(submit_bio); * for the next range of segments (if any) in the cluster. * * Return: - * 0 - we are done with this request, call end_that_request_last() - * 1 - still buffers pending for this request + * %0 - we are done with this request, call end_that_request_last() + * %1 - still buffers pending for this request **/ static int __end_that_request_first(struct request *req, int error, int nr_bytes) @@ -1522,7 +1643,7 @@ static int __end_that_request_first(struct request *req, int error, blk_add_trace_rq(req->q, req, BLK_TA_COMPLETE); /* - * for a REQ_BLOCK_PC request, we want to carry any eventual + * for a REQ_TYPE_BLOCK_PC request, we want to carry any eventual * sense key with us all the way through */ if (!blk_pc_request(req)) @@ -1535,11 +1656,14 @@ static int __end_that_request_first(struct request *req, int error, } if (blk_fs_request(req) && req->rq_disk) { - struct hd_struct *part = get_part(req->rq_disk, req->sector); const int rw = rq_data_dir(req); + struct hd_struct *part; + int cpu; - all_stat_add(req->rq_disk, part, sectors[rw], - nr_bytes >> 9, req->sector); + cpu = part_stat_lock(); + part = disk_map_sector_rcu(req->rq_disk, req->sector); + part_stat_add(cpu, part, sectors[rw], nr_bytes >> 9); + part_stat_unlock(); } total_bytes = bio_nbytes = 0; @@ -1624,88 +1748,14 @@ static int __end_that_request_first(struct request *req, int error, } /* - * splice the completion data to a local structure and hand off to - * process_completion_queue() to complete the requests - */ -static void blk_done_softirq(struct softirq_action *h) -{ - struct list_head *cpu_list, local_list; - - local_irq_disable(); - cpu_list = &__get_cpu_var(blk_cpu_done); - list_replace_init(cpu_list, &local_list); - local_irq_enable(); - - while (!list_empty(&local_list)) { - struct request *rq; - - rq = list_entry(local_list.next, struct request, donelist); - list_del_init(&rq->donelist); - rq->q->softirq_done_fn(rq); - } -} - -static int __cpuinit blk_cpu_notify(struct notifier_block *self, - unsigned long action, void *hcpu) -{ - /* - * If a CPU goes away, splice its entries to the current CPU - * and trigger a run of the softirq - */ - if (action == CPU_DEAD || action == CPU_DEAD_FROZEN) { - int cpu = (unsigned long) hcpu; - - local_irq_disable(); - list_splice_init(&per_cpu(blk_cpu_done, cpu), - &__get_cpu_var(blk_cpu_done)); - raise_softirq_irqoff(BLOCK_SOFTIRQ); - local_irq_enable(); - } - - return NOTIFY_OK; -} - - -static struct notifier_block blk_cpu_notifier __cpuinitdata = { - .notifier_call = blk_cpu_notify, -}; - -/** - * blk_complete_request - end I/O on a request - * @req: the request being processed - * - * Description: - * Ends all I/O on a request. It does not handle partial completions, - * unless the driver actually implements this in its completion callback - * through requeueing. The actual completion happens out-of-order, - * through a softirq handler. The user must have registered a completion - * callback through blk_queue_softirq_done(). - **/ - -void blk_complete_request(struct request *req) -{ - struct list_head *cpu_list; - unsigned long flags; - - BUG_ON(!req->q->softirq_done_fn); - - local_irq_save(flags); - - cpu_list = &__get_cpu_var(blk_cpu_done); - list_add_tail(&req->donelist, cpu_list); - raise_softirq_irqoff(BLOCK_SOFTIRQ); - - local_irq_restore(flags); -} -EXPORT_SYMBOL(blk_complete_request); - -/* * queue lock must be held */ static void end_that_request_last(struct request *req, int error) { struct gendisk *disk = req->rq_disk; + blk_delete_timer(req); + if (blk_rq_tagged(req)) blk_queue_end_tag(req->q, req); @@ -1723,16 +1773,18 @@ static void end_that_request_last(struct request *req, int error) if (disk && blk_fs_request(req) && req != &req->q->bar_rq) { unsigned long duration = jiffies - req->start_time; const int rw = rq_data_dir(req); - struct hd_struct *part = get_part(disk, req->sector); - - __all_stat_inc(disk, part, ios[rw], req->sector); - __all_stat_add(disk, part, ticks[rw], duration, req->sector); - disk_round_stats(disk); - disk->in_flight--; - if (part) { - part_round_stats(part); - part->in_flight--; - } + struct hd_struct *part; + int cpu; + + cpu = part_stat_lock(); + part = disk_map_sector_rcu(disk, req->sector); + + part_stat_inc(cpu, part, ios[rw]); + part_stat_add(cpu, part, ticks[rw], duration); + part_round_stats(cpu, part); + part_dec_in_flight(part); + + part_stat_unlock(); } if (req->end_io) @@ -1745,17 +1797,6 @@ static void end_that_request_last(struct request *req, int error) } } -static inline void __end_request(struct request *rq, int uptodate, - unsigned int nr_bytes) -{ - int error = 0; - - if (uptodate <= 0) - error = uptodate ? uptodate : -EIO; - - __blk_end_request(rq, error, nr_bytes); -} - /** * blk_rq_bytes - Returns bytes left to complete in the entire request * @rq: the request being processed @@ -1786,74 +1827,57 @@ unsigned int blk_rq_cur_bytes(struct request *rq) EXPORT_SYMBOL_GPL(blk_rq_cur_bytes); /** - * end_queued_request - end all I/O on a queued request - * @rq: the request being processed - * @uptodate: error value or 0/1 uptodate flag - * - * Description: - * Ends all I/O on a request, and removes it from the block layer queues. - * Not suitable for normal IO completion, unless the driver still has - * the request attached to the block layer. - * - **/ -void end_queued_request(struct request *rq, int uptodate) -{ - __end_request(rq, uptodate, blk_rq_bytes(rq)); -} -EXPORT_SYMBOL(end_queued_request); - -/** - * end_dequeued_request - end all I/O on a dequeued request - * @rq: the request being processed - * @uptodate: error value or 0/1 uptodate flag - * - * Description: - * Ends all I/O on a request. The request must already have been - * dequeued using blkdev_dequeue_request(), as is normally the case - * for most drivers. - * - **/ -void end_dequeued_request(struct request *rq, int uptodate) -{ - __end_request(rq, uptodate, blk_rq_bytes(rq)); -} -EXPORT_SYMBOL(end_dequeued_request); - - -/** * end_request - end I/O on the current segment of the request * @req: the request being processed - * @uptodate: error value or 0/1 uptodate flag + * @uptodate: error value or %0/%1 uptodate flag * * Description: * Ends I/O on the current segment of a request. If that is the only * remaining segment, the request is also completed and freed. * - * This is a remnant of how older block drivers handled IO completions. - * Modern drivers typically end IO on the full request in one go, unless + * This is a remnant of how older block drivers handled I/O completions. + * Modern drivers typically end I/O on the full request in one go, unless * they have a residual value to account for. For that case this function * isn't really useful, unless the residual just happens to be the * full current segment. In other words, don't use this function in new - * code. Either use end_request_completely(), or the - * end_that_request_chunk() (along with end_that_request_last()) for - * partial completions. - * + * code. Use blk_end_request() or __blk_end_request() to end a request. **/ void end_request(struct request *req, int uptodate) { - __end_request(req, uptodate, req->hard_cur_sectors << 9); + int error = 0; + + if (uptodate <= 0) + error = uptodate ? uptodate : -EIO; + + __blk_end_request(req, error, req->hard_cur_sectors << 9); } EXPORT_SYMBOL(end_request); +static int end_that_request_data(struct request *rq, int error, + unsigned int nr_bytes, unsigned int bidi_bytes) +{ + if (rq->bio) { + if (__end_that_request_first(rq, error, nr_bytes)) + return 1; + + /* Bidi request must be completed as a whole */ + if (blk_bidi_rq(rq) && + __end_that_request_first(rq->next_rq, error, bidi_bytes)) + return 1; + } + + return 0; +} + /** * blk_end_io - Generic end_io function to complete a request. * @rq: the request being processed - * @error: 0 for success, < 0 for error + * @error: %0 for success, < %0 for error * @nr_bytes: number of bytes to complete @rq * @bidi_bytes: number of bytes to complete @rq->next_rq * @drv_callback: function called between completion of bios in the request * and completion of the request. - * If the callback returns non 0, this helper returns without + * If the callback returns non %0, this helper returns without * completion of the request. * * Description: @@ -1861,8 +1885,8 @@ EXPORT_SYMBOL(end_request); * If @rq has leftover, sets it up for the next range of segments. * * Return: - * 0 - we are done with this request - * 1 - this request is not freed yet, it still has pending buffers. + * %0 - we are done with this request + * %1 - this request is not freed yet, it still has pending buffers. **/ static int blk_end_io(struct request *rq, int error, unsigned int nr_bytes, unsigned int bidi_bytes, @@ -1871,15 +1895,8 @@ static int blk_end_io(struct request *rq, int error, unsigned int nr_bytes, struct request_queue *q = rq->q; unsigned long flags = 0UL; - if (blk_fs_request(rq) || blk_pc_request(rq)) { - if (__end_that_request_first(rq, error, nr_bytes)) - return 1; - - /* Bidi request must be completed as a whole */ - if (blk_bidi_rq(rq) && - __end_that_request_first(rq->next_rq, error, bidi_bytes)) - return 1; - } + if (end_that_request_data(rq, error, nr_bytes, bidi_bytes)) + return 1; /* Special feature for tricky drivers */ if (drv_callback && drv_callback(rq)) @@ -1897,7 +1914,7 @@ static int blk_end_io(struct request *rq, int error, unsigned int nr_bytes, /** * blk_end_request - Helper function for drivers to complete the request. * @rq: the request being processed - * @error: 0 for success, < 0 for error + * @error: %0 for success, < %0 for error * @nr_bytes: number of bytes to complete * * Description: @@ -1905,8 +1922,8 @@ static int blk_end_io(struct request *rq, int error, unsigned int nr_bytes, * If @rq has leftover, sets it up for the next range of segments. * * Return: - * 0 - we are done with this request - * 1 - still buffers pending for this request + * %0 - we are done with this request + * %1 - still buffers pending for this request **/ int blk_end_request(struct request *rq, int error, unsigned int nr_bytes) { @@ -1917,22 +1934,20 @@ EXPORT_SYMBOL_GPL(blk_end_request); /** * __blk_end_request - Helper function for drivers to complete the request. * @rq: the request being processed - * @error: 0 for success, < 0 for error + * @error: %0 for success, < %0 for error * @nr_bytes: number of bytes to complete * * Description: * Must be called with queue lock held unlike blk_end_request(). * * Return: - * 0 - we are done with this request - * 1 - still buffers pending for this request + * %0 - we are done with this request + * %1 - still buffers pending for this request **/ int __blk_end_request(struct request *rq, int error, unsigned int nr_bytes) { - if (blk_fs_request(rq) || blk_pc_request(rq)) { - if (__end_that_request_first(rq, error, nr_bytes)) - return 1; - } + if (rq->bio && __end_that_request_first(rq, error, nr_bytes)) + return 1; add_disk_randomness(rq->rq_disk); @@ -1945,7 +1960,7 @@ EXPORT_SYMBOL_GPL(__blk_end_request); /** * blk_end_bidi_request - Helper function for drivers to complete bidi request. * @rq: the bidi request being processed - * @error: 0 for success, < 0 for error + * @error: %0 for success, < %0 for error * @nr_bytes: number of bytes to complete @rq * @bidi_bytes: number of bytes to complete @rq->next_rq * @@ -1953,8 +1968,8 @@ EXPORT_SYMBOL_GPL(__blk_end_request); * Ends I/O on a number of bytes attached to @rq and @rq->next_rq. * * Return: - * 0 - we are done with this request - * 1 - still buffers pending for this request + * %0 - we are done with this request + * %1 - still buffers pending for this request **/ int blk_end_bidi_request(struct request *rq, int error, unsigned int nr_bytes, unsigned int bidi_bytes) @@ -1964,13 +1979,43 @@ int blk_end_bidi_request(struct request *rq, int error, unsigned int nr_bytes, EXPORT_SYMBOL_GPL(blk_end_bidi_request); /** + * blk_update_request - Special helper function for request stacking drivers + * @rq: the request being processed + * @error: %0 for success, < %0 for error + * @nr_bytes: number of bytes to complete @rq + * + * Description: + * Ends I/O on a number of bytes attached to @rq, but doesn't complete + * the request structure even if @rq doesn't have leftover. + * If @rq has leftover, sets it up for the next range of segments. + * + * This special helper function is only for request stacking drivers + * (e.g. request-based dm) so that they can handle partial completion. + * Actual device drivers should use blk_end_request instead. + */ +void blk_update_request(struct request *rq, int error, unsigned int nr_bytes) +{ + if (!end_that_request_data(rq, error, nr_bytes, 0)) { + /* + * These members are not updated in end_that_request_data() + * when all bios are completed. + * Update them so that the request stacking driver can find + * how many bytes remain in the request later. + */ + rq->nr_sectors = rq->hard_nr_sectors = 0; + rq->current_nr_sectors = rq->hard_cur_sectors = 0; + } +} +EXPORT_SYMBOL_GPL(blk_update_request); + +/** * blk_end_request_callback - Special helper function for tricky drivers * @rq: the request being processed - * @error: 0 for success, < 0 for error + * @error: %0 for success, < %0 for error * @nr_bytes: number of bytes to complete * @drv_callback: function called between completion of bios in the request * and completion of the request. - * If the callback returns non 0, this helper returns without + * If the callback returns non %0, this helper returns without * completion of the request. * * Description: @@ -1983,10 +2028,10 @@ EXPORT_SYMBOL_GPL(blk_end_bidi_request); * Don't use this interface in other places anymore. * * Return: - * 0 - we are done with this request - * 1 - this request is not freed yet. - * this request still has pending buffers or - * the driver doesn't want to finish this request yet. + * %0 - we are done with this request + * %1 - this request is not freed yet. + * this request still has pending buffers or + * the driver doesn't want to finish this request yet. **/ int blk_end_request_callback(struct request *rq, int error, unsigned int nr_bytes, @@ -1999,15 +2044,17 @@ EXPORT_SYMBOL_GPL(blk_end_request_callback); void blk_rq_bio_prep(struct request_queue *q, struct request *rq, struct bio *bio) { - /* first two bits are identical in rq->cmd_flags and bio->bi_rw */ + /* Bit 0 (R/W) is identical in rq->cmd_flags and bio->bi_rw, and + we want BIO_RW_AHEAD (bit 1) to imply REQ_FAILFAST (bit 1). */ rq->cmd_flags |= (bio->bi_rw & 3); - rq->nr_phys_segments = bio_phys_segments(q, bio); - rq->nr_hw_segments = bio_hw_segments(q, bio); + if (bio_has_data(bio)) { + rq->nr_phys_segments = bio_phys_segments(q, bio); + rq->buffer = bio_data(bio); + } rq->current_nr_sectors = bio_cur_sectors(bio); rq->hard_cur_sectors = rq->current_nr_sectors; rq->hard_nr_sectors = rq->nr_sectors = bio_sectors(bio); - rq->buffer = bio_data(bio); rq->data_len = bio->bi_size; rq->bio = rq->biotail = bio; @@ -2016,7 +2063,35 @@ void blk_rq_bio_prep(struct request_queue *q, struct request *rq, rq->rq_disk = bio->bi_bdev->bd_disk; } -int kblockd_schedule_work(struct work_struct *work) +/** + * blk_lld_busy - Check if underlying low-level drivers of a device are busy + * @q : the queue of the device being checked + * + * Description: + * Check if underlying low-level drivers of a device are busy. + * If the drivers want to export their busy state, they must set own + * exporting function using blk_queue_lld_busy() first. + * + * Basically, this function is used only by request stacking drivers + * to stop dispatching requests to underlying devices when underlying + * devices are busy. This behavior helps more I/O merging on the queue + * of the request stacking driver and prevents I/O throughput regression + * on burst I/O load. + * + * Return: + * 0 - Not busy (The request stacking driver should dispatch request) + * 1 - Busy (The request stacking driver should stop dispatching request) + */ +int blk_lld_busy(struct request_queue *q) +{ + if (q->lld_busy_fn) + return q->lld_busy_fn(q); + + return 0; +} +EXPORT_SYMBOL_GPL(blk_lld_busy); + +int kblockd_schedule_work(struct request_queue *q, struct work_struct *work) { return queue_work(kblockd_workqueue, work); } @@ -2030,8 +2105,6 @@ EXPORT_SYMBOL(kblockd_flush_work); int __init blk_dev_init(void) { - int i; - kblockd_workqueue = create_workqueue("kblockd"); if (!kblockd_workqueue) panic("Failed to create kblockd\n"); @@ -2042,12 +2115,6 @@ int __init blk_dev_init(void) blk_requestq_cachep = kmem_cache_create("blkdev_queue", sizeof(struct request_queue), 0, SLAB_PANIC, NULL); - for_each_possible_cpu(i) - INIT_LIST_HEAD(&per_cpu(blk_cpu_done, i)); - - open_softirq(BLOCK_SOFTIRQ, blk_done_softirq, NULL); - register_hotcpu_notifier(&blk_cpu_notifier); - return 0; } diff --git a/block/blk-exec.c b/block/blk-exec.c index 391dd6224890..6af716d1e54e 100644 --- a/block/blk-exec.c +++ b/block/blk-exec.c @@ -16,9 +16,9 @@ /** * blk_end_sync_rq - executes a completion event on a request * @rq: request to complete - * @error: end io status of the request + * @error: end I/O status of the request */ -void blk_end_sync_rq(struct request *rq, int error) +static void blk_end_sync_rq(struct request *rq, int error) { struct completion *waiting = rq->end_io_data; @@ -31,7 +31,6 @@ void blk_end_sync_rq(struct request *rq, int error) */ complete(waiting); } -EXPORT_SYMBOL(blk_end_sync_rq); /** * blk_execute_rq_nowait - insert a request into queue for execution @@ -42,7 +41,7 @@ EXPORT_SYMBOL(blk_end_sync_rq); * @done: I/O completion handler * * Description: - * Insert a fully prepared request at the back of the io scheduler queue + * Insert a fully prepared request at the back of the I/O scheduler queue * for execution. Don't wait for completion. */ void blk_execute_rq_nowait(struct request_queue *q, struct gendisk *bd_disk, @@ -58,6 +57,9 @@ void blk_execute_rq_nowait(struct request_queue *q, struct gendisk *bd_disk, spin_lock_irq(q->queue_lock); __elv_add_request(q, rq, where, 1); __generic_unplug_device(q); + /* the queue is stopped so it won't be plugged+unplugged */ + if (blk_pm_resume_request(rq)) + q->request_fn(q); spin_unlock_irq(q->queue_lock); } EXPORT_SYMBOL_GPL(blk_execute_rq_nowait); @@ -70,7 +72,7 @@ EXPORT_SYMBOL_GPL(blk_execute_rq_nowait); * @at_head: insert request at head or tail of queue * * Description: - * Insert a fully prepared request at the back of the io scheduler queue + * Insert a fully prepared request at the back of the I/O scheduler queue * for execution and wait for completion. */ int blk_execute_rq(struct request_queue *q, struct gendisk *bd_disk, diff --git a/block/blk-integrity.c b/block/blk-integrity.c new file mode 100644 index 000000000000..61a8e2f8fdd0 --- /dev/null +++ b/block/blk-integrity.c @@ -0,0 +1,382 @@ +/* + * blk-integrity.c - Block layer data integrity extensions + * + * Copyright (C) 2007, 2008 Oracle Corporation + * Written by: Martin K. Petersen <martin.petersen@oracle.com> + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License version + * 2 as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; see the file COPYING. If not, write to + * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, + * USA. + * + */ + +#include <linux/blkdev.h> +#include <linux/mempool.h> +#include <linux/bio.h> +#include <linux/scatterlist.h> + +#include "blk.h" + +static struct kmem_cache *integrity_cachep; + +/** + * blk_rq_count_integrity_sg - Count number of integrity scatterlist elements + * @rq: request with integrity metadata attached + * + * Description: Returns the number of elements required in a + * scatterlist corresponding to the integrity metadata in a request. + */ +int blk_rq_count_integrity_sg(struct request *rq) +{ + struct bio_vec *iv, *ivprv; + struct req_iterator iter; + unsigned int segments; + + ivprv = NULL; + segments = 0; + + rq_for_each_integrity_segment(iv, rq, iter) { + + if (!ivprv || !BIOVEC_PHYS_MERGEABLE(ivprv, iv)) + segments++; + + ivprv = iv; + } + + return segments; +} +EXPORT_SYMBOL(blk_rq_count_integrity_sg); + +/** + * blk_rq_map_integrity_sg - Map integrity metadata into a scatterlist + * @rq: request with integrity metadata attached + * @sglist: target scatterlist + * + * Description: Map the integrity vectors in request into a + * scatterlist. The scatterlist must be big enough to hold all + * elements. I.e. sized using blk_rq_count_integrity_sg(). + */ +int blk_rq_map_integrity_sg(struct request *rq, struct scatterlist *sglist) +{ + struct bio_vec *iv, *ivprv; + struct req_iterator iter; + struct scatterlist *sg; + unsigned int segments; + + ivprv = NULL; + sg = NULL; + segments = 0; + + rq_for_each_integrity_segment(iv, rq, iter) { + + if (ivprv) { + if (!BIOVEC_PHYS_MERGEABLE(ivprv, iv)) + goto new_segment; + + sg->length += iv->bv_len; + } else { +new_segment: + if (!sg) + sg = sglist; + else { + sg->page_link &= ~0x02; + sg = sg_next(sg); + } + + sg_set_page(sg, iv->bv_page, iv->bv_len, iv->bv_offset); + segments++; + } + + ivprv = iv; + } + + if (sg) + sg_mark_end(sg); + + return segments; +} +EXPORT_SYMBOL(blk_rq_map_integrity_sg); + +/** + * blk_integrity_compare - Compare integrity profile of two disks + * @gd1: Disk to compare + * @gd2: Disk to compare + * + * Description: Meta-devices like DM and MD need to verify that all + * sub-devices use the same integrity format before advertising to + * upper layers that they can send/receive integrity metadata. This + * function can be used to check whether two gendisk devices have + * compatible integrity formats. + */ +int blk_integrity_compare(struct gendisk *gd1, struct gendisk *gd2) +{ + struct blk_integrity *b1 = gd1->integrity; + struct blk_integrity *b2 = gd2->integrity; + + if (!b1 && !b2) + return 0; + + if (!b1 || !b2) + return -1; + + if (b1->sector_size != b2->sector_size) { + printk(KERN_ERR "%s: %s/%s sector sz %u != %u\n", __func__, + gd1->disk_name, gd2->disk_name, + b1->sector_size, b2->sector_size); + return -1; + } + + if (b1->tuple_size != b2->tuple_size) { + printk(KERN_ERR "%s: %s/%s tuple sz %u != %u\n", __func__, + gd1->disk_name, gd2->disk_name, + b1->tuple_size, b2->tuple_size); + return -1; + } + + if (b1->tag_size && b2->tag_size && (b1->tag_size != b2->tag_size)) { + printk(KERN_ERR "%s: %s/%s tag sz %u != %u\n", __func__, + gd1->disk_name, gd2->disk_name, + b1->tag_size, b2->tag_size); + return -1; + } + + if (strcmp(b1->name, b2->name)) { + printk(KERN_ERR "%s: %s/%s type %s != %s\n", __func__, + gd1->disk_name, gd2->disk_name, + b1->name, b2->name); + return -1; + } + + return 0; +} +EXPORT_SYMBOL(blk_integrity_compare); + +struct integrity_sysfs_entry { + struct attribute attr; + ssize_t (*show)(struct blk_integrity *, char *); + ssize_t (*store)(struct blk_integrity *, const char *, size_t); +}; + +static ssize_t integrity_attr_show(struct kobject *kobj, struct attribute *attr, + char *page) +{ + struct blk_integrity *bi = + container_of(kobj, struct blk_integrity, kobj); + struct integrity_sysfs_entry *entry = + container_of(attr, struct integrity_sysfs_entry, attr); + + return entry->show(bi, page); +} + +static ssize_t integrity_attr_store(struct kobject *kobj, + struct attribute *attr, const char *page, + size_t count) +{ + struct blk_integrity *bi = + container_of(kobj, struct blk_integrity, kobj); + struct integrity_sysfs_entry *entry = + container_of(attr, struct integrity_sysfs_entry, attr); + ssize_t ret = 0; + + if (entry->store) + ret = entry->store(bi, page, count); + + return ret; +} + +static ssize_t integrity_format_show(struct blk_integrity *bi, char *page) +{ + if (bi != NULL && bi->name != NULL) + return sprintf(page, "%s\n", bi->name); + else + return sprintf(page, "none\n"); +} + +static ssize_t integrity_tag_size_show(struct blk_integrity *bi, char *page) +{ + if (bi != NULL) + return sprintf(page, "%u\n", bi->tag_size); + else + return sprintf(page, "0\n"); +} + +static ssize_t integrity_read_store(struct blk_integrity *bi, + const char *page, size_t count) +{ + char *p = (char *) page; + unsigned long val = simple_strtoul(p, &p, 10); + + if (val) + bi->flags |= INTEGRITY_FLAG_READ; + else + bi->flags &= ~INTEGRITY_FLAG_READ; + + return count; +} + +static ssize_t integrity_read_show(struct blk_integrity *bi, char *page) +{ + return sprintf(page, "%d\n", (bi->flags & INTEGRITY_FLAG_READ) != 0); +} + +static ssize_t integrity_write_store(struct blk_integrity *bi, + const char *page, size_t count) +{ + char *p = (char *) page; + unsigned long val = simple_strtoul(p, &p, 10); + + if (val) + bi->flags |= INTEGRITY_FLAG_WRITE; + else + bi->flags &= ~INTEGRITY_FLAG_WRITE; + + return count; +} + +static ssize_t integrity_write_show(struct blk_integrity *bi, char *page) +{ + return sprintf(page, "%d\n", (bi->flags & INTEGRITY_FLAG_WRITE) != 0); +} + +static struct integrity_sysfs_entry integrity_format_entry = { + .attr = { .name = "format", .mode = S_IRUGO }, + .show = integrity_format_show, +}; + +static struct integrity_sysfs_entry integrity_tag_size_entry = { + .attr = { .name = "tag_size", .mode = S_IRUGO }, + .show = integrity_tag_size_show, +}; + +static struct integrity_sysfs_entry integrity_read_entry = { + .attr = { .name = "read_verify", .mode = S_IRUGO | S_IWUSR }, + .show = integrity_read_show, + .store = integrity_read_store, +}; + +static struct integrity_sysfs_entry integrity_write_entry = { + .attr = { .name = "write_generate", .mode = S_IRUGO | S_IWUSR }, + .show = integrity_write_show, + .store = integrity_write_store, +}; + +static struct attribute *integrity_attrs[] = { + &integrity_format_entry.attr, + &integrity_tag_size_entry.attr, + &integrity_read_entry.attr, + &integrity_write_entry.attr, + NULL, +}; + +static struct sysfs_ops integrity_ops = { + .show = &integrity_attr_show, + .store = &integrity_attr_store, +}; + +static int __init blk_dev_integrity_init(void) +{ + integrity_cachep = kmem_cache_create("blkdev_integrity", + sizeof(struct blk_integrity), + 0, SLAB_PANIC, NULL); + return 0; +} +subsys_initcall(blk_dev_integrity_init); + +static void blk_integrity_release(struct kobject *kobj) +{ + struct blk_integrity *bi = + container_of(kobj, struct blk_integrity, kobj); + + kmem_cache_free(integrity_cachep, bi); +} + +static struct kobj_type integrity_ktype = { + .default_attrs = integrity_attrs, + .sysfs_ops = &integrity_ops, + .release = blk_integrity_release, +}; + +/** + * blk_integrity_register - Register a gendisk as being integrity-capable + * @disk: struct gendisk pointer to make integrity-aware + * @template: integrity profile + * + * Description: When a device needs to advertise itself as being able + * to send/receive integrity metadata it must use this function to + * register the capability with the block layer. The template is a + * blk_integrity struct with values appropriate for the underlying + * hardware. See Documentation/block/data-integrity.txt. + */ +int blk_integrity_register(struct gendisk *disk, struct blk_integrity *template) +{ + struct blk_integrity *bi; + + BUG_ON(disk == NULL); + BUG_ON(template == NULL); + + if (disk->integrity == NULL) { + bi = kmem_cache_alloc(integrity_cachep, + GFP_KERNEL | __GFP_ZERO); + if (!bi) + return -1; + + if (kobject_init_and_add(&bi->kobj, &integrity_ktype, + &disk_to_dev(disk)->kobj, + "%s", "integrity")) { + kmem_cache_free(integrity_cachep, bi); + return -1; + } + + kobject_uevent(&bi->kobj, KOBJ_ADD); + + bi->flags |= INTEGRITY_FLAG_READ | INTEGRITY_FLAG_WRITE; + bi->sector_size = disk->queue->hardsect_size; + disk->integrity = bi; + } else + bi = disk->integrity; + + /* Use the provided profile as template */ + bi->name = template->name; + bi->generate_fn = template->generate_fn; + bi->verify_fn = template->verify_fn; + bi->tuple_size = template->tuple_size; + bi->set_tag_fn = template->set_tag_fn; + bi->get_tag_fn = template->get_tag_fn; + bi->tag_size = template->tag_size; + + return 0; +} +EXPORT_SYMBOL(blk_integrity_register); + +/** + * blk_integrity_unregister - Remove block integrity profile + * @disk: disk whose integrity profile to deallocate + * + * Description: This function frees all memory used by the block + * integrity profile. To be called at device teardown. + */ +void blk_integrity_unregister(struct gendisk *disk) +{ + struct blk_integrity *bi; + + if (!disk || !disk->integrity) + return; + + bi = disk->integrity; + + kobject_uevent(&bi->kobj, KOBJ_REMOVE); + kobject_del(&bi->kobj); + kmem_cache_free(integrity_cachep, bi); + disk->integrity = NULL; +} +EXPORT_SYMBOL(blk_integrity_unregister); diff --git a/block/blk-map.c b/block/blk-map.c index 0b1af5a3537c..4849fa36161e 100644 --- a/block/blk-map.c +++ b/block/blk-map.c @@ -41,10 +41,10 @@ static int __blk_rq_unmap_user(struct bio *bio) } static int __blk_rq_map_user(struct request_queue *q, struct request *rq, - void __user *ubuf, unsigned int len) + struct rq_map_data *map_data, void __user *ubuf, + unsigned int len, int null_mapped, gfp_t gfp_mask) { unsigned long uaddr; - unsigned int alignment; struct bio *bio, *orig_bio; int reading, ret; @@ -55,15 +55,17 @@ static int __blk_rq_map_user(struct request_queue *q, struct request *rq, * direct dma. else, set up kernel bounce buffers */ uaddr = (unsigned long) ubuf; - alignment = queue_dma_alignment(q) | q->dma_pad_mask; - if (!(uaddr & alignment) && !(len & alignment)) - bio = bio_map_user(q, NULL, uaddr, len, reading); + if (blk_rq_aligned(q, ubuf, len) && !map_data) + bio = bio_map_user(q, NULL, uaddr, len, reading, gfp_mask); else - bio = bio_copy_user(q, uaddr, len, reading); + bio = bio_copy_user(q, map_data, uaddr, len, reading, gfp_mask); if (IS_ERR(bio)) return PTR_ERR(bio); + if (null_mapped) + bio->bi_flags |= (1 << BIO_NULL_MAPPED); + orig_bio = bio; blk_queue_bounce(q, &bio); @@ -85,17 +87,19 @@ static int __blk_rq_map_user(struct request_queue *q, struct request *rq, } /** - * blk_rq_map_user - map user data to a request, for REQ_BLOCK_PC usage + * blk_rq_map_user - map user data to a request, for REQ_TYPE_BLOCK_PC usage * @q: request queue where request should be inserted * @rq: request structure to fill + * @map_data: pointer to the rq_map_data holding pages (if necessary) * @ubuf: the user buffer * @len: length of user data + * @gfp_mask: memory allocation flags * * Description: - * Data will be mapped directly for zero copy io, if possible. Otherwise + * Data will be mapped directly for zero copy I/O, if possible. Otherwise * a kernel bounce buffer is used. * - * A matching blk_rq_unmap_user() must be issued at the end of io, while + * A matching blk_rq_unmap_user() must be issued at the end of I/O, while * still in process context. * * Note: The mapped bio may need to be bounced through blk_queue_bounce() @@ -105,16 +109,22 @@ static int __blk_rq_map_user(struct request_queue *q, struct request *rq, * unmapping. */ int blk_rq_map_user(struct request_queue *q, struct request *rq, - void __user *ubuf, unsigned long len) + struct rq_map_data *map_data, void __user *ubuf, + unsigned long len, gfp_t gfp_mask) { unsigned long bytes_read = 0; struct bio *bio = NULL; - int ret; + int ret, null_mapped = 0; if (len > (q->max_hw_sectors << 9)) return -EINVAL; - if (!len || !ubuf) + if (!len) return -EINVAL; + if (!ubuf) { + if (!map_data || rq_data_dir(rq) != READ) + return -EINVAL; + null_mapped = 1; + } while (bytes_read != len) { unsigned long map_len, end, start; @@ -132,7 +142,8 @@ int blk_rq_map_user(struct request_queue *q, struct request *rq, if (end - start > BIO_MAX_PAGES) map_len -= PAGE_SIZE; - ret = __blk_rq_map_user(q, rq, ubuf, map_len); + ret = __blk_rq_map_user(q, rq, map_data, ubuf, map_len, + null_mapped, gfp_mask); if (ret < 0) goto unmap_rq; if (!bio) @@ -154,18 +165,20 @@ unmap_rq: EXPORT_SYMBOL(blk_rq_map_user); /** - * blk_rq_map_user_iov - map user data to a request, for REQ_BLOCK_PC usage + * blk_rq_map_user_iov - map user data to a request, for REQ_TYPE_BLOCK_PC usage * @q: request queue where request should be inserted * @rq: request to map data to + * @map_data: pointer to the rq_map_data holding pages (if necessary) * @iov: pointer to the iovec * @iov_count: number of elements in the iovec * @len: I/O byte count + * @gfp_mask: memory allocation flags * * Description: - * Data will be mapped directly for zero copy io, if possible. Otherwise + * Data will be mapped directly for zero copy I/O, if possible. Otherwise * a kernel bounce buffer is used. * - * A matching blk_rq_unmap_user() must be issued at the end of io, while + * A matching blk_rq_unmap_user() must be issued at the end of I/O, while * still in process context. * * Note: The mapped bio may need to be bounced through blk_queue_bounce() @@ -175,7 +188,8 @@ EXPORT_SYMBOL(blk_rq_map_user); * unmapping. */ int blk_rq_map_user_iov(struct request_queue *q, struct request *rq, - struct sg_iovec *iov, int iov_count, unsigned int len) + struct rq_map_data *map_data, struct sg_iovec *iov, + int iov_count, unsigned int len, gfp_t gfp_mask) { struct bio *bio; int i, read = rq_data_dir(rq) == READ; @@ -193,10 +207,11 @@ int blk_rq_map_user_iov(struct request_queue *q, struct request *rq, } } - if (unaligned || (q->dma_pad_mask & len)) - bio = bio_copy_user_iov(q, iov, iov_count, read); + if (unaligned || (q->dma_pad_mask & len) || map_data) + bio = bio_copy_user_iov(q, map_data, iov, iov_count, read, + gfp_mask); else - bio = bio_map_user_iov(q, NULL, iov, iov_count, read); + bio = bio_map_user_iov(q, NULL, iov, iov_count, read, gfp_mask); if (IS_ERR(bio)) return PTR_ERR(bio); @@ -210,11 +225,13 @@ int blk_rq_map_user_iov(struct request_queue *q, struct request *rq, if (!bio_flagged(bio, BIO_USER_MAPPED)) rq->cmd_flags |= REQ_COPY_USER; + blk_queue_bounce(q, &bio); bio_get(bio); blk_rq_bio_prep(q, rq, bio); rq->buffer = rq->data = NULL; return 0; } +EXPORT_SYMBOL(blk_rq_map_user_iov); /** * blk_rq_unmap_user - unmap a request with user data @@ -223,7 +240,7 @@ int blk_rq_map_user_iov(struct request_queue *q, struct request *rq, * Description: * Unmap a rq previously mapped by blk_rq_map_user(). The caller must * supply the original rq->bio from the blk_rq_map_user() return, since - * the io completion may have changed rq->bio. + * the I/O completion may have changed rq->bio. */ int blk_rq_unmap_user(struct bio *bio) { @@ -249,7 +266,7 @@ int blk_rq_unmap_user(struct bio *bio) EXPORT_SYMBOL(blk_rq_unmap_user); /** - * blk_rq_map_kern - map kernel data to a request, for REQ_BLOCK_PC usage + * blk_rq_map_kern - map kernel data to a request, for REQ_TYPE_BLOCK_PC usage * @q: request queue where request should be inserted * @rq: request to fill * @kbuf: the kernel buffer @@ -263,8 +280,6 @@ EXPORT_SYMBOL(blk_rq_unmap_user); int blk_rq_map_kern(struct request_queue *q, struct request *rq, void *kbuf, unsigned int len, gfp_t gfp_mask) { - unsigned long kaddr; - unsigned int alignment; int reading = rq_data_dir(rq) == READ; int do_copy = 0; struct bio *bio; @@ -274,10 +289,7 @@ int blk_rq_map_kern(struct request_queue *q, struct request *rq, void *kbuf, if (!len || !kbuf) return -EINVAL; - kaddr = (unsigned long)kbuf; - alignment = queue_dma_alignment(q) | q->dma_pad_mask; - do_copy = ((kaddr & alignment) || (len & alignment)); - + do_copy = !blk_rq_aligned(q, kbuf, len) || object_is_on_stack(kbuf); if (do_copy) bio = bio_copy_kern(q, kbuf, len, gfp_mask, reading); else diff --git a/block/blk-merge.c b/block/blk-merge.c index 651136aae76e..908d3e11ac52 100644 --- a/block/blk-merge.c +++ b/block/blk-merge.c @@ -11,7 +11,7 @@ void blk_recalc_rq_sectors(struct request *rq, int nsect) { - if (blk_fs_request(rq)) { + if (blk_fs_request(rq) || blk_discard_rq(rq)) { rq->hard_sector += nsect; rq->hard_nr_sectors -= nsect; @@ -41,12 +41,9 @@ void blk_recalc_rq_sectors(struct request *rq, int nsect) void blk_recalc_rq_segments(struct request *rq) { int nr_phys_segs; - int nr_hw_segs; unsigned int phys_size; - unsigned int hw_size; struct bio_vec *bv, *bvprv = NULL; int seg_size; - int hw_seg_size; int cluster; struct req_iterator iter; int high, highprv = 1; @@ -56,8 +53,8 @@ void blk_recalc_rq_segments(struct request *rq) return; cluster = test_bit(QUEUE_FLAG_CLUSTER, &q->queue_flags); - hw_seg_size = seg_size = 0; - phys_size = hw_size = nr_phys_segs = nr_hw_segs = 0; + seg_size = 0; + phys_size = nr_phys_segs = 0; rq_for_each_segment(bv, rq, iter) { /* * the trick here is making sure that a high page is never @@ -66,7 +63,7 @@ void blk_recalc_rq_segments(struct request *rq) */ high = page_to_pfn(bv->bv_page) > q->bounce_pfn; if (high || highprv) - goto new_hw_segment; + goto new_segment; if (cluster) { if (seg_size + bv->bv_len > q->max_segment_size) goto new_segment; @@ -74,40 +71,19 @@ void blk_recalc_rq_segments(struct request *rq) goto new_segment; if (!BIOVEC_SEG_BOUNDARY(q, bvprv, bv)) goto new_segment; - if (BIOVEC_VIRT_OVERSIZE(hw_seg_size + bv->bv_len)) - goto new_hw_segment; seg_size += bv->bv_len; - hw_seg_size += bv->bv_len; bvprv = bv; continue; } new_segment: - if (BIOVEC_VIRT_MERGEABLE(bvprv, bv) && - !BIOVEC_VIRT_OVERSIZE(hw_seg_size + bv->bv_len)) - hw_seg_size += bv->bv_len; - else { -new_hw_segment: - if (nr_hw_segs == 1 && - hw_seg_size > rq->bio->bi_hw_front_size) - rq->bio->bi_hw_front_size = hw_seg_size; - hw_seg_size = BIOVEC_VIRT_START_SIZE(bv) + bv->bv_len; - nr_hw_segs++; - } - nr_phys_segs++; bvprv = bv; seg_size = bv->bv_len; highprv = high; } - if (nr_hw_segs == 1 && - hw_seg_size > rq->bio->bi_hw_front_size) - rq->bio->bi_hw_front_size = hw_seg_size; - if (hw_seg_size > rq->biotail->bi_hw_back_size) - rq->biotail->bi_hw_back_size = hw_seg_size; rq->nr_phys_segments = nr_phys_segs; - rq->nr_hw_segments = nr_hw_segs; } void blk_recount_segments(struct request_queue *q, struct bio *bio) @@ -120,7 +96,6 @@ void blk_recount_segments(struct request_queue *q, struct bio *bio) blk_recalc_rq_segments(&rq); bio->bi_next = nxt; bio->bi_phys_segments = rq.nr_phys_segments; - bio->bi_hw_segments = rq.nr_hw_segments; bio->bi_flags |= (1 << BIO_SEG_VALID); } EXPORT_SYMBOL(blk_recount_segments); @@ -131,13 +106,17 @@ static int blk_phys_contig_segment(struct request_queue *q, struct bio *bio, if (!test_bit(QUEUE_FLAG_CLUSTER, &q->queue_flags)) return 0; - if (!BIOVEC_PHYS_MERGEABLE(__BVEC_END(bio), __BVEC_START(nxt))) - return 0; if (bio->bi_size + nxt->bi_size > q->max_segment_size) return 0; + if (!bio_has_data(bio)) + return 1; + + if (!BIOVEC_PHYS_MERGEABLE(__BVEC_END(bio), __BVEC_START(nxt))) + return 0; + /* - * bio and nxt are contigous in memory, check if the queue allows + * bio and nxt are contiguous in memory; check if the queue allows * these two to be merged into one */ if (BIO_SEG_BOUNDARY(q, bio, nxt)) @@ -146,22 +125,6 @@ static int blk_phys_contig_segment(struct request_queue *q, struct bio *bio, return 0; } -static int blk_hw_contig_segment(struct request_queue *q, struct bio *bio, - struct bio *nxt) -{ - if (!bio_flagged(bio, BIO_SEG_VALID)) - blk_recount_segments(q, bio); - if (!bio_flagged(nxt, BIO_SEG_VALID)) - blk_recount_segments(q, nxt); - if (!BIOVEC_VIRT_MERGEABLE(__BVEC_END(bio), __BVEC_START(nxt)) || - BIOVEC_VIRT_OVERSIZE(bio->bi_hw_back_size + nxt->bi_hw_front_size)) - return 0; - if (bio->bi_hw_back_size + nxt->bi_hw_front_size > q->max_segment_size) - return 0; - - return 1; -} - /* * map a request to scatterlist, return number of sg entries setup. Caller * must make sure sg can hold rq->nr_phys_segments entries @@ -275,10 +238,9 @@ static inline int ll_new_hw_segment(struct request_queue *q, struct request *req, struct bio *bio) { - int nr_hw_segs = bio_hw_segments(q, bio); int nr_phys_segs = bio_phys_segments(q, bio); - if (req->nr_hw_segments + nr_hw_segs > q->max_hw_segments + if (req->nr_phys_segments + nr_phys_segs > q->max_hw_segments || req->nr_phys_segments + nr_phys_segs > q->max_phys_segments) { req->cmd_flags |= REQ_NOMERGE; if (req == q->last_merge) @@ -290,7 +252,6 @@ static inline int ll_new_hw_segment(struct request_queue *q, * This will form the start of a new hw segment. Bump both * counters. */ - req->nr_hw_segments += nr_hw_segs; req->nr_phys_segments += nr_phys_segs; return 1; } @@ -299,7 +260,6 @@ int ll_back_merge_fn(struct request_queue *q, struct request *req, struct bio *bio) { unsigned short max_sectors; - int len; if (unlikely(blk_pc_request(req))) max_sectors = q->max_hw_sectors; @@ -316,19 +276,6 @@ int ll_back_merge_fn(struct request_queue *q, struct request *req, blk_recount_segments(q, req->biotail); if (!bio_flagged(bio, BIO_SEG_VALID)) blk_recount_segments(q, bio); - len = req->biotail->bi_hw_back_size + bio->bi_hw_front_size; - if (BIOVEC_VIRT_MERGEABLE(__BVEC_END(req->biotail), __BVEC_START(bio)) - && !BIOVEC_VIRT_OVERSIZE(len)) { - int mergeable = ll_new_mergeable(q, req, bio); - - if (mergeable) { - if (req->nr_hw_segments == 1) - req->bio->bi_hw_front_size = len; - if (bio->bi_hw_segments == 1) - bio->bi_hw_back_size = len; - } - return mergeable; - } return ll_new_hw_segment(q, req, bio); } @@ -337,7 +284,6 @@ int ll_front_merge_fn(struct request_queue *q, struct request *req, struct bio *bio) { unsigned short max_sectors; - int len; if (unlikely(blk_pc_request(req))) max_sectors = q->max_hw_sectors; @@ -351,23 +297,10 @@ int ll_front_merge_fn(struct request_queue *q, struct request *req, q->last_merge = NULL; return 0; } - len = bio->bi_hw_back_size + req->bio->bi_hw_front_size; if (!bio_flagged(bio, BIO_SEG_VALID)) blk_recount_segments(q, bio); if (!bio_flagged(req->bio, BIO_SEG_VALID)) blk_recount_segments(q, req->bio); - if (BIOVEC_VIRT_MERGEABLE(__BVEC_END(bio), __BVEC_START(req->bio)) && - !BIOVEC_VIRT_OVERSIZE(len)) { - int mergeable = ll_new_mergeable(q, req, bio); - - if (mergeable) { - if (bio->bi_hw_segments == 1) - bio->bi_hw_front_size = len; - if (req->nr_hw_segments == 1) - req->biotail->bi_hw_back_size = len; - } - return mergeable; - } return ll_new_hw_segment(q, req, bio); } @@ -376,7 +309,6 @@ static int ll_merge_requests_fn(struct request_queue *q, struct request *req, struct request *next) { int total_phys_segments; - int total_hw_segments; /* * First check if the either of the requests are re-queued @@ -398,26 +330,11 @@ static int ll_merge_requests_fn(struct request_queue *q, struct request *req, if (total_phys_segments > q->max_phys_segments) return 0; - total_hw_segments = req->nr_hw_segments + next->nr_hw_segments; - if (blk_hw_contig_segment(q, req->biotail, next->bio)) { - int len = req->biotail->bi_hw_back_size + - next->bio->bi_hw_front_size; - /* - * propagate the combined length to the end of the requests - */ - if (req->nr_hw_segments == 1) - req->bio->bi_hw_front_size = len; - if (next->nr_hw_segments == 1) - next->biotail->bi_hw_back_size = len; - total_hw_segments--; - } - - if (total_hw_segments > q->max_hw_segments) + if (total_phys_segments > q->max_hw_segments) return 0; /* Merge is OK... */ req->nr_phys_segments = total_phys_segments; - req->nr_hw_segments = total_hw_segments; return 1; } @@ -441,6 +358,9 @@ static int attempt_merge(struct request_queue *q, struct request *req, || next->special) return 0; + if (blk_integrity_rq(req) != blk_integrity_rq(next)) + return 0; + /* * If we are allowed to merge, then append bio list * from next to rq and release next. merge_requests_fn @@ -467,17 +387,21 @@ static int attempt_merge(struct request_queue *q, struct request *req, elv_merge_requests(q, req, next); if (req->rq_disk) { - struct hd_struct *part - = get_part(req->rq_disk, req->sector); - disk_round_stats(req->rq_disk); - req->rq_disk->in_flight--; - if (part) { - part_round_stats(part); - part->in_flight--; - } + struct hd_struct *part; + int cpu; + + cpu = part_stat_lock(); + part = disk_map_sector_rcu(req->rq_disk, req->sector); + + part_round_stats(cpu, part); + part_dec_in_flight(part); + + part_stat_unlock(); } req->ioprio = ioprio_best(req->ioprio, next->ioprio); + if (blk_rq_cpu_valid(next)) + req->cpu = next->cpu; __blk_put_request(q, next); return 1; diff --git a/block/blk-settings.c b/block/blk-settings.c index 8dd86418f35d..b21dcdb64151 100644 --- a/block/blk-settings.c +++ b/block/blk-settings.c @@ -33,6 +33,23 @@ void blk_queue_prep_rq(struct request_queue *q, prep_rq_fn *pfn) EXPORT_SYMBOL(blk_queue_prep_rq); /** + * blk_queue_set_discard - set a discard_sectors function for queue + * @q: queue + * @dfn: prepare_discard function + * + * It's possible for a queue to register a discard callback which is used + * to transform a discard request into the appropriate type for the + * hardware. If none is registered, then discard requests are failed + * with %EOPNOTSUPP. + * + */ +void blk_queue_set_discard(struct request_queue *q, prepare_discard_fn *dfn) +{ + q->prepare_discard_fn = dfn; +} +EXPORT_SYMBOL(blk_queue_set_discard); + +/** * blk_queue_merge_bvec - set a merge_bvec function for queue * @q: queue * @mbfn: merge_bvec_fn @@ -60,6 +77,24 @@ void blk_queue_softirq_done(struct request_queue *q, softirq_done_fn *fn) } EXPORT_SYMBOL(blk_queue_softirq_done); +void blk_queue_rq_timeout(struct request_queue *q, unsigned int timeout) +{ + q->rq_timeout = timeout; +} +EXPORT_SYMBOL_GPL(blk_queue_rq_timeout); + +void blk_queue_rq_timed_out(struct request_queue *q, rq_timed_out_fn *fn) +{ + q->rq_timed_out_fn = fn; +} +EXPORT_SYMBOL_GPL(blk_queue_rq_timed_out); + +void blk_queue_lld_busy(struct request_queue *q, lld_busy_fn *fn) +{ + q->lld_busy_fn = fn; +} +EXPORT_SYMBOL_GPL(blk_queue_lld_busy); + /** * blk_queue_make_request - define an alternate make_request function for a device * @q: the request queue for the device to be affected @@ -127,7 +162,7 @@ EXPORT_SYMBOL(blk_queue_make_request); * Different hardware can have different requirements as to what pages * it can do I/O directly to. A low level driver can call * blk_queue_bounce_limit to have lower memory pages allocated as bounce - * buffers for doing I/O to pages residing above @page. + * buffers for doing I/O to pages residing above @dma_addr. **/ void blk_queue_bounce_limit(struct request_queue *q, u64 dma_addr) { @@ -212,7 +247,7 @@ EXPORT_SYMBOL(blk_queue_max_phys_segments); * Description: * Enables a low level driver to set an upper limit on the number of * hw data segments in a request. This would be the largest number of - * address/length pairs the host adapter can actually give as once + * address/length pairs the host adapter can actually give at once * to the device. **/ void blk_queue_max_hw_segments(struct request_queue *q, @@ -302,11 +337,10 @@ EXPORT_SYMBOL(blk_queue_stack_limits); * @q: the request queue for the device * @mask: pad mask * - * Set pad mask. Direct IO requests are padded to the mask specified. + * Set dma pad mask. * - * Appending pad buffer to a request modifies ->data_len such that it - * includes the pad buffer. The original requested data length can be - * obtained using blk_rq_raw_data_len(). + * Appending pad buffer to a request modifies the last entry of a + * scatter list such that it includes the pad buffer. **/ void blk_queue_dma_pad(struct request_queue *q, unsigned int mask) { @@ -315,6 +349,23 @@ void blk_queue_dma_pad(struct request_queue *q, unsigned int mask) EXPORT_SYMBOL(blk_queue_dma_pad); /** + * blk_queue_update_dma_pad - update pad mask + * @q: the request queue for the device + * @mask: pad mask + * + * Update dma pad mask. + * + * Appending pad buffer to a request modifies the last entry of a + * scatter list such that it includes the pad buffer. + **/ +void blk_queue_update_dma_pad(struct request_queue *q, unsigned int mask) +{ + if (mask > q->dma_pad_mask) + q->dma_pad_mask = mask; +} +EXPORT_SYMBOL(blk_queue_update_dma_pad); + +/** * blk_queue_dma_drain - Set up a drain buffer for excess dma. * @q: the request queue for the device * @dma_drain_needed: fn which returns non-zero if drain is necessary @@ -377,7 +428,7 @@ EXPORT_SYMBOL(blk_queue_segment_boundary); * @mask: alignment mask * * description: - * set required memory and length aligment for direct dma transactions. + * set required memory and length alignment for direct dma transactions. * this is used when buiding direct io requests for the queue. * **/ @@ -393,7 +444,7 @@ EXPORT_SYMBOL(blk_queue_dma_alignment); * @mask: alignment mask * * description: - * update required memory and length aligment for direct dma transactions. + * update required memory and length alignment for direct dma transactions. * If the requested alignment is larger than the current alignment, then * the current queue alignment is updated to the new value, otherwise it * is left alone. The design of this is to allow multiple objects diff --git a/block/blk-softirq.c b/block/blk-softirq.c new file mode 100644 index 000000000000..e660d26ca656 --- /dev/null +++ b/block/blk-softirq.c @@ -0,0 +1,175 @@ +/* + * Functions related to softirq rq completions + */ +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/bio.h> +#include <linux/blkdev.h> +#include <linux/interrupt.h> +#include <linux/cpu.h> + +#include "blk.h" + +static DEFINE_PER_CPU(struct list_head, blk_cpu_done); + +/* + * Softirq action handler - move entries to local list and loop over them + * while passing them to the queue registered handler. + */ +static void blk_done_softirq(struct softirq_action *h) +{ + struct list_head *cpu_list, local_list; + + local_irq_disable(); + cpu_list = &__get_cpu_var(blk_cpu_done); + list_replace_init(cpu_list, &local_list); + local_irq_enable(); + + while (!list_empty(&local_list)) { + struct request *rq; + + rq = list_entry(local_list.next, struct request, csd.list); + list_del_init(&rq->csd.list); + rq->q->softirq_done_fn(rq); + } +} + +#if defined(CONFIG_SMP) && defined(CONFIG_USE_GENERIC_SMP_HELPERS) +static void trigger_softirq(void *data) +{ + struct request *rq = data; + unsigned long flags; + struct list_head *list; + + local_irq_save(flags); + list = &__get_cpu_var(blk_cpu_done); + list_add_tail(&rq->csd.list, list); + + if (list->next == &rq->csd.list) + raise_softirq_irqoff(BLOCK_SOFTIRQ); + + local_irq_restore(flags); +} + +/* + * Setup and invoke a run of 'trigger_softirq' on the given cpu. + */ +static int raise_blk_irq(int cpu, struct request *rq) +{ + if (cpu_online(cpu)) { + struct call_single_data *data = &rq->csd; + + data->func = trigger_softirq; + data->info = rq; + data->flags = 0; + + __smp_call_function_single(cpu, data); + return 0; + } + + return 1; +} +#else /* CONFIG_SMP && CONFIG_USE_GENERIC_SMP_HELPERS */ +static int raise_blk_irq(int cpu, struct request *rq) +{ + return 1; +} +#endif + +static int __cpuinit blk_cpu_notify(struct notifier_block *self, + unsigned long action, void *hcpu) +{ + /* + * If a CPU goes away, splice its entries to the current CPU + * and trigger a run of the softirq + */ + if (action == CPU_DEAD || action == CPU_DEAD_FROZEN) { + int cpu = (unsigned long) hcpu; + + local_irq_disable(); + list_splice_init(&per_cpu(blk_cpu_done, cpu), + &__get_cpu_var(blk_cpu_done)); + raise_softirq_irqoff(BLOCK_SOFTIRQ); + local_irq_enable(); + } + + return NOTIFY_OK; +} + +static struct notifier_block __cpuinitdata blk_cpu_notifier = { + .notifier_call = blk_cpu_notify, +}; + +void __blk_complete_request(struct request *req) +{ + struct request_queue *q = req->q; + unsigned long flags; + int ccpu, cpu, group_cpu; + + BUG_ON(!q->softirq_done_fn); + + local_irq_save(flags); + cpu = smp_processor_id(); + group_cpu = blk_cpu_to_group(cpu); + + /* + * Select completion CPU + */ + if (test_bit(QUEUE_FLAG_SAME_COMP, &q->queue_flags) && req->cpu != -1) + ccpu = req->cpu; + else + ccpu = cpu; + + if (ccpu == cpu || ccpu == group_cpu) { + struct list_head *list; +do_local: + list = &__get_cpu_var(blk_cpu_done); + list_add_tail(&req->csd.list, list); + + /* + * if the list only contains our just added request, + * signal a raise of the softirq. If there are already + * entries there, someone already raised the irq but it + * hasn't run yet. + */ + if (list->next == &req->csd.list) + raise_softirq_irqoff(BLOCK_SOFTIRQ); + } else if (raise_blk_irq(ccpu, req)) + goto do_local; + + local_irq_restore(flags); +} + +/** + * blk_complete_request - end I/O on a request + * @req: the request being processed + * + * Description: + * Ends all I/O on a request. It does not handle partial completions, + * unless the driver actually implements this in its completion callback + * through requeueing. The actual completion happens out-of-order, + * through a softirq handler. The user must have registered a completion + * callback through blk_queue_softirq_done(). + **/ +void blk_complete_request(struct request *req) +{ + if (unlikely(blk_should_fake_timeout(req->q))) + return; + if (!blk_mark_rq_complete(req)) + __blk_complete_request(req); +} +EXPORT_SYMBOL(blk_complete_request); + +__init int blk_softirq_init(void) +{ + int i; + + for_each_possible_cpu(i) + INIT_LIST_HEAD(&per_cpu(blk_cpu_done, i)); + + open_softirq(BLOCK_SOFTIRQ, blk_done_softirq); + register_hotcpu_notifier(&blk_cpu_notifier); + return 0; +} +subsys_initcall(blk_softirq_init); diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c index 304ec73ab821..21e275d7eed9 100644 --- a/block/blk-sysfs.c +++ b/block/blk-sysfs.c @@ -156,6 +156,30 @@ static ssize_t queue_nomerges_store(struct request_queue *q, const char *page, return ret; } +static ssize_t queue_rq_affinity_show(struct request_queue *q, char *page) +{ + unsigned int set = test_bit(QUEUE_FLAG_SAME_COMP, &q->queue_flags); + + return queue_var_show(set != 0, page); +} + +static ssize_t +queue_rq_affinity_store(struct request_queue *q, const char *page, size_t count) +{ + ssize_t ret = -EINVAL; +#if defined(CONFIG_USE_GENERIC_SMP_HELPERS) + unsigned long val; + + ret = queue_var_store(&val, page, count); + spin_lock_irq(q->queue_lock); + if (val) + queue_flag_set(QUEUE_FLAG_SAME_COMP, q); + else + queue_flag_clear(QUEUE_FLAG_SAME_COMP, q); + spin_unlock_irq(q->queue_lock); +#endif + return ret; +} static struct queue_sysfs_entry queue_requests_entry = { .attr = {.name = "nr_requests", .mode = S_IRUGO | S_IWUSR }, @@ -197,6 +221,12 @@ static struct queue_sysfs_entry queue_nomerges_entry = { .store = queue_nomerges_store, }; +static struct queue_sysfs_entry queue_rq_affinity_entry = { + .attr = {.name = "rq_affinity", .mode = S_IRUGO | S_IWUSR }, + .show = queue_rq_affinity_show, + .store = queue_rq_affinity_store, +}; + static struct attribute *default_attrs[] = { &queue_requests_entry.attr, &queue_ra_entry.attr, @@ -205,6 +235,7 @@ static struct attribute *default_attrs[] = { &queue_iosched_entry.attr, &queue_hw_sector_size_entry.attr, &queue_nomerges_entry.attr, + &queue_rq_affinity_entry.attr, NULL, }; @@ -310,7 +341,7 @@ int blk_register_queue(struct gendisk *disk) if (!q->request_fn) return 0; - ret = kobject_add(&q->kobj, kobject_get(&disk->dev.kobj), + ret = kobject_add(&q->kobj, kobject_get(&disk_to_dev(disk)->kobj), "%s", "queue"); if (ret < 0) return ret; @@ -339,6 +370,6 @@ void blk_unregister_queue(struct gendisk *disk) kobject_uevent(&q->kobj, KOBJ_REMOVE); kobject_del(&q->kobj); - kobject_put(&disk->dev.kobj); + kobject_put(&disk_to_dev(disk)->kobj); } } diff --git a/block/blk-tag.c b/block/blk-tag.c index 32667beb03ee..c0d419e84ce7 100644 --- a/block/blk-tag.c +++ b/block/blk-tag.c @@ -29,7 +29,7 @@ EXPORT_SYMBOL(blk_queue_find_tag); * __blk_free_tags - release a given set of tag maintenance info * @bqt: the tag map to free * - * Tries to free the specified @bqt@. Returns true if it was + * Tries to free the specified @bqt. Returns true if it was * actually freed and false if there are still references using it */ static int __blk_free_tags(struct blk_queue_tag *bqt) @@ -38,7 +38,8 @@ static int __blk_free_tags(struct blk_queue_tag *bqt) retval = atomic_dec_and_test(&bqt->refcnt); if (retval) { - BUG_ON(bqt->busy); + BUG_ON(find_first_bit(bqt->tag_map, bqt->max_depth) < + bqt->max_depth); kfree(bqt->tag_index); bqt->tag_index = NULL; @@ -77,7 +78,7 @@ void __blk_queue_free_tags(struct request_queue *q) * blk_free_tags - release a given set of tag maintenance info * @bqt: the tag map to free * - * For externally managed @bqt@ frees the map. Callers of this + * For externally managed @bqt frees the map. Callers of this * function must guarantee to have released all the queues that * might have been using this tag map. */ @@ -93,7 +94,7 @@ EXPORT_SYMBOL(blk_free_tags); * @q: the request queue for the device * * Notes: - * This is used to disabled tagged queuing to a device, yet leave + * This is used to disable tagged queuing to a device, yet leave * queue in function. **/ void blk_queue_free_tags(struct request_queue *q) @@ -147,7 +148,6 @@ static struct blk_queue_tag *__blk_queue_init_tags(struct request_queue *q, if (init_tag_map(q, tags, depth)) goto fail; - tags->busy = 0; atomic_set(&tags->refcnt, 1); return tags; fail: @@ -271,7 +271,7 @@ EXPORT_SYMBOL(blk_queue_resize_tags); * @rq: the request that has completed * * Description: - * Typically called when end_that_request_first() returns 0, meaning + * Typically called when end_that_request_first() returns %0, meaning * all transfers have been done for a request. It's important to call * this function before end_that_request_last(), as that will put the * request back on the free list thus corrupting the internal tag list. @@ -313,7 +313,6 @@ void blk_queue_end_tag(struct request_queue *q, struct request *rq) * unlock memory barrier semantics. */ clear_bit_unlock(tag, bqt->tag_map); - bqt->busy--; } EXPORT_SYMBOL(blk_queue_end_tag); @@ -338,6 +337,7 @@ EXPORT_SYMBOL(blk_queue_end_tag); int blk_queue_start_tag(struct request_queue *q, struct request *rq) { struct blk_queue_tag *bqt = q->queue_tags; + unsigned max_depth, offset; int tag; if (unlikely((rq->cmd_flags & REQ_QUEUED))) { @@ -351,10 +351,19 @@ int blk_queue_start_tag(struct request_queue *q, struct request *rq) /* * Protect against shared tag maps, as we may not have exclusive * access to the tag map. + * + * We reserve a few tags just for sync IO, since we don't want + * to starve sync IO on behalf of flooding async IO. */ + max_depth = bqt->max_depth; + if (rq_is_sync(rq)) + offset = 0; + else + offset = max_depth >> 2; + do { - tag = find_first_zero_bit(bqt->tag_map, bqt->max_depth); - if (tag >= bqt->max_depth) + tag = find_next_zero_bit(bqt->tag_map, max_depth, offset); + if (tag >= max_depth) return 1; } while (test_and_set_bit_lock(tag, bqt->tag_map)); @@ -368,7 +377,6 @@ int blk_queue_start_tag(struct request_queue *q, struct request *rq) bqt->tag_index[tag] = rq; blkdev_dequeue_request(rq); list_add(&rq->queuelist, &q->tag_busy_list); - bqt->busy++; return 0; } EXPORT_SYMBOL(blk_queue_start_tag); diff --git a/block/blk-timeout.c b/block/blk-timeout.c new file mode 100644 index 000000000000..972a63f848fb --- /dev/null +++ b/block/blk-timeout.c @@ -0,0 +1,238 @@ +/* + * Functions related to generic timeout handling of requests. + */ +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/blkdev.h> +#include <linux/fault-inject.h> + +#include "blk.h" + +#ifdef CONFIG_FAIL_IO_TIMEOUT + +static DECLARE_FAULT_ATTR(fail_io_timeout); + +static int __init setup_fail_io_timeout(char *str) +{ + return setup_fault_attr(&fail_io_timeout, str); +} +__setup("fail_io_timeout=", setup_fail_io_timeout); + +int blk_should_fake_timeout(struct request_queue *q) +{ + if (!test_bit(QUEUE_FLAG_FAIL_IO, &q->queue_flags)) + return 0; + + return should_fail(&fail_io_timeout, 1); +} + +static int __init fail_io_timeout_debugfs(void) +{ + return init_fault_attr_dentries(&fail_io_timeout, "fail_io_timeout"); +} + +late_initcall(fail_io_timeout_debugfs); + +ssize_t part_timeout_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct gendisk *disk = dev_to_disk(dev); + int set = test_bit(QUEUE_FLAG_FAIL_IO, &disk->queue->queue_flags); + + return sprintf(buf, "%d\n", set != 0); +} + +ssize_t part_timeout_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct gendisk *disk = dev_to_disk(dev); + int val; + + if (count) { + struct request_queue *q = disk->queue; + char *p = (char *) buf; + + val = simple_strtoul(p, &p, 10); + spin_lock_irq(q->queue_lock); + if (val) + queue_flag_set(QUEUE_FLAG_FAIL_IO, q); + else + queue_flag_clear(QUEUE_FLAG_FAIL_IO, q); + spin_unlock_irq(q->queue_lock); + } + + return count; +} + +#endif /* CONFIG_FAIL_IO_TIMEOUT */ + +/* + * blk_delete_timer - Delete/cancel timer for a given function. + * @req: request that we are canceling timer for + * + */ +void blk_delete_timer(struct request *req) +{ + struct request_queue *q = req->q; + + /* + * Nothing to detach + */ + if (!q->rq_timed_out_fn || !req->deadline) + return; + + list_del_init(&req->timeout_list); + + if (list_empty(&q->timeout_list)) + del_timer(&q->timeout); +} + +static void blk_rq_timed_out(struct request *req) +{ + struct request_queue *q = req->q; + enum blk_eh_timer_return ret; + + ret = q->rq_timed_out_fn(req); + switch (ret) { + case BLK_EH_HANDLED: + __blk_complete_request(req); + break; + case BLK_EH_RESET_TIMER: + blk_clear_rq_complete(req); + blk_add_timer(req); + break; + case BLK_EH_NOT_HANDLED: + /* + * LLD handles this for now but in the future + * we can send a request msg to abort the command + * and we can move more of the generic scsi eh code to + * the blk layer. + */ + break; + default: + printk(KERN_ERR "block: bad eh return: %d\n", ret); + break; + } +} + +void blk_rq_timed_out_timer(unsigned long data) +{ + struct request_queue *q = (struct request_queue *) data; + unsigned long flags, uninitialized_var(next), next_set = 0; + struct request *rq, *tmp; + + spin_lock_irqsave(q->queue_lock, flags); + + list_for_each_entry_safe(rq, tmp, &q->timeout_list, timeout_list) { + if (time_after_eq(jiffies, rq->deadline)) { + list_del_init(&rq->timeout_list); + + /* + * Check if we raced with end io completion + */ + if (blk_mark_rq_complete(rq)) + continue; + blk_rq_timed_out(rq); + } + if (!next_set) { + next = rq->deadline; + next_set = 1; + } else if (time_after(next, rq->deadline)) + next = rq->deadline; + } + + if (next_set && !list_empty(&q->timeout_list)) + mod_timer(&q->timeout, round_jiffies(next)); + + spin_unlock_irqrestore(q->queue_lock, flags); +} + +/** + * blk_abort_request -- Request request recovery for the specified command + * @req: pointer to the request of interest + * + * This function requests that the block layer start recovery for the + * request by deleting the timer and calling the q's timeout function. + * LLDDs who implement their own error recovery MAY ignore the timeout + * event if they generated blk_abort_req. Must hold queue lock. + */ +void blk_abort_request(struct request *req) +{ + if (blk_mark_rq_complete(req)) + return; + blk_delete_timer(req); + blk_rq_timed_out(req); +} +EXPORT_SYMBOL_GPL(blk_abort_request); + +/** + * blk_add_timer - Start timeout timer for a single request + * @req: request that is about to start running. + * + * Notes: + * Each request has its own timer, and as it is added to the queue, we + * set up the timer. When the request completes, we cancel the timer. + */ +void blk_add_timer(struct request *req) +{ + struct request_queue *q = req->q; + unsigned long expiry; + + if (!q->rq_timed_out_fn) + return; + + BUG_ON(!list_empty(&req->timeout_list)); + BUG_ON(test_bit(REQ_ATOM_COMPLETE, &req->atomic_flags)); + + if (req->timeout) + req->deadline = jiffies + req->timeout; + else { + req->deadline = jiffies + q->rq_timeout; + /* + * Some LLDs, like scsi, peek at the timeout to prevent + * a command from being retried forever. + */ + req->timeout = q->rq_timeout; + } + list_add_tail(&req->timeout_list, &q->timeout_list); + + /* + * If the timer isn't already pending or this timeout is earlier + * than an existing one, modify the timer. Round to next nearest + * second. + */ + expiry = round_jiffies(req->deadline); + + /* + * We use ->deadline == 0 to detect whether a timer was added or + * not, so just increase to next jiffy for that specific case + */ + if (unlikely(!req->deadline)) + req->deadline = 1; + + if (!timer_pending(&q->timeout) || + time_before(expiry, q->timeout.expires)) + mod_timer(&q->timeout, expiry); +} + +/** + * blk_abort_queue -- Abort all request on given queue + * @queue: pointer to queue + * + */ +void blk_abort_queue(struct request_queue *q) +{ + unsigned long flags; + struct request *rq, *tmp; + + spin_lock_irqsave(q->queue_lock, flags); + + elv_abort_queue(q); + + list_for_each_entry_safe(rq, tmp, &q->timeout_list, timeout_list) + blk_abort_request(rq); + + spin_unlock_irqrestore(q->queue_lock, flags); + +} +EXPORT_SYMBOL_GPL(blk_abort_queue); diff --git a/block/blk.h b/block/blk.h index 59776ab4742a..e5c579769963 100644 --- a/block/blk.h +++ b/block/blk.h @@ -17,6 +17,42 @@ void __blk_queue_free_tags(struct request_queue *q); void blk_unplug_work(struct work_struct *work); void blk_unplug_timeout(unsigned long data); +void blk_rq_timed_out_timer(unsigned long data); +void blk_delete_timer(struct request *); +void blk_add_timer(struct request *); + +/* + * Internal atomic flags for request handling + */ +enum rq_atomic_flags { + REQ_ATOM_COMPLETE = 0, +}; + +/* + * EH timer and IO completion will both attempt to 'grab' the request, make + * sure that only one of them suceeds + */ +static inline int blk_mark_rq_complete(struct request *rq) +{ + return test_and_set_bit(REQ_ATOM_COMPLETE, &rq->atomic_flags); +} + +static inline void blk_clear_rq_complete(struct request *rq) +{ + clear_bit(REQ_ATOM_COMPLETE, &rq->atomic_flags); +} + +#ifdef CONFIG_FAIL_IO_TIMEOUT +int blk_should_fake_timeout(struct request_queue *); +ssize_t part_timeout_show(struct device *, struct device_attribute *, char *); +ssize_t part_timeout_store(struct device *, struct device_attribute *, + const char *, size_t); +#else +static inline int blk_should_fake_timeout(struct request_queue *q) +{ + return 0; +} +#endif struct io_context *current_io_context(gfp_t gfp_flags, int node); @@ -51,4 +87,24 @@ static inline int queue_congestion_off_threshold(struct request_queue *q) return q->nr_congestion_off; } +#if defined(CONFIG_BLK_DEV_INTEGRITY) + +#define rq_for_each_integrity_segment(bvl, _rq, _iter) \ + __rq_for_each_bio(_iter.bio, _rq) \ + bip_for_each_vec(bvl, _iter.bio->bi_integrity, _iter.i) + +#endif /* BLK_DEV_INTEGRITY */ + +static inline int blk_cpu_to_group(int cpu) +{ +#ifdef CONFIG_SCHED_MC + cpumask_t mask = cpu_coregroup_map(cpu); + return first_cpu(mask); +#elif defined(CONFIG_SCHED_SMT) + return first_cpu(per_cpu(cpu_sibling_map, cpu)); +#else + return cpu; +#endif +} + #endif diff --git a/block/blktrace.c b/block/blktrace.c index 8d3a27780260..85049a7e7a17 100644 --- a/block/blktrace.c +++ b/block/blktrace.c @@ -111,23 +111,9 @@ static int act_log_check(struct blk_trace *bt, u32 what, sector_t sector, */ static u32 ddir_act[2] __read_mostly = { BLK_TC_ACT(BLK_TC_READ), BLK_TC_ACT(BLK_TC_WRITE) }; -/* - * Bio action bits of interest - */ -static u32 bio_act[9] __read_mostly = { 0, BLK_TC_ACT(BLK_TC_BARRIER), BLK_TC_ACT(BLK_TC_SYNC), 0, BLK_TC_ACT(BLK_TC_AHEAD), 0, 0, 0, BLK_TC_ACT(BLK_TC_META) }; - -/* - * More could be added as needed, taking care to increment the decrementer - * to get correct indexing - */ -#define trace_barrier_bit(rw) \ - (((rw) & (1 << BIO_RW_BARRIER)) >> (BIO_RW_BARRIER - 0)) -#define trace_sync_bit(rw) \ - (((rw) & (1 << BIO_RW_SYNC)) >> (BIO_RW_SYNC - 1)) -#define trace_ahead_bit(rw) \ - (((rw) & (1 << BIO_RW_AHEAD)) << (2 - BIO_RW_AHEAD)) -#define trace_meta_bit(rw) \ - (((rw) & (1 << BIO_RW_META)) >> (BIO_RW_META - 3)) +/* The ilog2() calls fall out because they're constant */ +#define MASK_TC_BIT(rw, __name) ( (rw & (1 << BIO_RW_ ## __name)) << \ + (ilog2(BLK_TC_ ## __name) + BLK_TC_SHIFT - BIO_RW_ ## __name) ) /* * The worker for the various blk_add_trace*() types. Fills out a @@ -147,10 +133,11 @@ void __blk_add_trace(struct blk_trace *bt, sector_t sector, int bytes, return; what |= ddir_act[rw & WRITE]; - what |= bio_act[trace_barrier_bit(rw)]; - what |= bio_act[trace_sync_bit(rw)]; - what |= bio_act[trace_ahead_bit(rw)]; - what |= bio_act[trace_meta_bit(rw)]; + what |= MASK_TC_BIT(rw, BARRIER); + what |= MASK_TC_BIT(rw, SYNC); + what |= MASK_TC_BIT(rw, AHEAD); + what |= MASK_TC_BIT(rw, META); + what |= MASK_TC_BIT(rw, DISCARD); pid = tsk->pid; if (unlikely(act_log_check(bt, what, sector, pid))) @@ -244,6 +231,7 @@ err: static void blk_trace_cleanup(struct blk_trace *bt) { relay_close(bt->rchan); + debugfs_remove(bt->msg_file); debugfs_remove(bt->dropped_file); blk_remove_tree(bt->dir); free_percpu(bt->sequence); @@ -291,6 +279,44 @@ static const struct file_operations blk_dropped_fops = { .read = blk_dropped_read, }; +static int blk_msg_open(struct inode *inode, struct file *filp) +{ + filp->private_data = inode->i_private; + + return 0; +} + +static ssize_t blk_msg_write(struct file *filp, const char __user *buffer, + size_t count, loff_t *ppos) +{ + char *msg; + struct blk_trace *bt; + + if (count > BLK_TN_MAX_MSG) + return -EINVAL; + + msg = kmalloc(count, GFP_KERNEL); + if (msg == NULL) + return -ENOMEM; + + if (copy_from_user(msg, buffer, count)) { + kfree(msg); + return -EFAULT; + } + + bt = filp->private_data; + __trace_note_message(bt, "%s", msg); + kfree(msg); + + return count; +} + +static const struct file_operations blk_msg_fops = { + .owner = THIS_MODULE, + .open = blk_msg_open, + .write = blk_msg_write, +}; + /* * Keep track of how many times we encountered a full subbuffer, to aid * the user space app in telling how many lost events there were. @@ -343,7 +369,8 @@ int do_blk_trace_setup(struct request_queue *q, char *name, dev_t dev, if (!buts->buf_size || !buts->buf_nr) return -EINVAL; - strcpy(buts->name, name); + strncpy(buts->name, name, BLKTRACE_BDEV_SIZE); + buts->name[BLKTRACE_BDEV_SIZE - 1] = '\0'; /* * some device names have larger paths - convert the slashes @@ -380,6 +407,10 @@ int do_blk_trace_setup(struct request_queue *q, char *name, dev_t dev, if (!bt->dropped_file) goto err; + bt->msg_file = debugfs_create_file("msg", 0222, dir, bt, &blk_msg_fops); + if (!bt->msg_file) + goto err; + bt->rchan = relay_open("trace", dir, buts->buf_size, buts->buf_nr, &blk_relay_callbacks, bt); if (!bt->rchan) @@ -409,6 +440,8 @@ err: if (dir) blk_remove_tree(dir); if (bt) { + if (bt->msg_file) + debugfs_remove(bt->msg_file); if (bt->dropped_file) debugfs_remove(bt->dropped_file); free_percpu(bt->sequence); diff --git a/block/bsg.c b/block/bsg.c index f0b7cd343216..034112bfe1f3 100644 --- a/block/bsg.c +++ b/block/bsg.c @@ -19,6 +19,7 @@ #include <linux/uio.h> #include <linux/idr.h> #include <linux/bsg.h> +#include <linux/smp_lock.h> #include <scsi/scsi.h> #include <scsi/scsi_ioctl.h> @@ -48,7 +49,6 @@ struct bsg_device { enum { BSG_F_BLOCK = 1, - BSG_F_WRITE_PERM = 2, }; #define BSG_DEFAULT_CMDS 64 @@ -172,7 +172,8 @@ unlock: } static int blk_fill_sgv4_hdr_rq(struct request_queue *q, struct request *rq, - struct sg_io_v4 *hdr, int has_write_perm) + struct sg_io_v4 *hdr, struct bsg_device *bd, + int has_write_perm) { if (hdr->request_len > BLK_MAX_CDB) { rq->cmd = kzalloc(hdr->request_len, GFP_KERNEL); @@ -185,7 +186,7 @@ static int blk_fill_sgv4_hdr_rq(struct request_queue *q, struct request *rq, return -EFAULT; if (hdr->subprotocol == BSG_SUB_PROTOCOL_SCSI_CMD) { - if (blk_verify_command(rq->cmd, has_write_perm)) + if (blk_verify_command(&q->cmd_filter, rq->cmd, has_write_perm)) return -EPERM; } else if (!capable(CAP_SYS_RAWIO)) return -EPERM; @@ -241,7 +242,7 @@ bsg_validate_sgv4_hdr(struct request_queue *q, struct sg_io_v4 *hdr, int *rw) * map sg_io_v4 to a request. */ static struct request * -bsg_map_hdr(struct bsg_device *bd, struct sg_io_v4 *hdr) +bsg_map_hdr(struct bsg_device *bd, struct sg_io_v4 *hdr, int has_write_perm) { struct request_queue *q = bd->queue; struct request *rq, *next_rq = NULL; @@ -263,8 +264,7 @@ bsg_map_hdr(struct bsg_device *bd, struct sg_io_v4 *hdr) rq = blk_get_request(q, rw, GFP_KERNEL); if (!rq) return ERR_PTR(-ENOMEM); - ret = blk_fill_sgv4_hdr_rq(q, rq, hdr, test_bit(BSG_F_WRITE_PERM, - &bd->flags)); + ret = blk_fill_sgv4_hdr_rq(q, rq, hdr, bd, has_write_perm); if (ret) goto out; @@ -283,7 +283,8 @@ bsg_map_hdr(struct bsg_device *bd, struct sg_io_v4 *hdr) next_rq->cmd_type = rq->cmd_type; dxferp = (void*)(unsigned long)hdr->din_xferp; - ret = blk_rq_map_user(q, next_rq, dxferp, hdr->din_xfer_len); + ret = blk_rq_map_user(q, next_rq, NULL, dxferp, + hdr->din_xfer_len, GFP_KERNEL); if (ret) goto out; } @@ -298,7 +299,8 @@ bsg_map_hdr(struct bsg_device *bd, struct sg_io_v4 *hdr) dxfer_len = 0; if (dxfer_len) { - ret = blk_rq_map_user(q, rq, dxferp, dxfer_len); + ret = blk_rq_map_user(q, rq, NULL, dxferp, dxfer_len, + GFP_KERNEL); if (ret) goto out; } @@ -566,14 +568,6 @@ static inline void bsg_set_block(struct bsg_device *bd, struct file *file) set_bit(BSG_F_BLOCK, &bd->flags); } -static inline void bsg_set_write_perm(struct bsg_device *bd, struct file *file) -{ - if (file->f_mode & FMODE_WRITE) - set_bit(BSG_F_WRITE_PERM, &bd->flags); - else - clear_bit(BSG_F_WRITE_PERM, &bd->flags); -} - /* * Check if the error is a "real" error that we should return. */ @@ -595,6 +589,7 @@ bsg_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) dprintk("%s: read %Zd bytes\n", bd->name, count); bsg_set_block(bd, file); + bytes_read = 0; ret = __bsg_read(buf, count, bd, NULL, &bytes_read); *ppos = bytes_read; @@ -606,7 +601,7 @@ bsg_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) } static int __bsg_write(struct bsg_device *bd, const char __user *buf, - size_t count, ssize_t *bytes_written) + size_t count, ssize_t *bytes_written, int has_write_perm) { struct bsg_command *bc; struct request *rq; @@ -637,7 +632,7 @@ static int __bsg_write(struct bsg_device *bd, const char __user *buf, /* * get a request, fill in the blanks, and add to request queue */ - rq = bsg_map_hdr(bd, &bc->hdr); + rq = bsg_map_hdr(bd, &bc->hdr, has_write_perm); if (IS_ERR(rq)) { ret = PTR_ERR(rq); rq = NULL; @@ -668,10 +663,11 @@ bsg_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) dprintk("%s: write %Zd bytes\n", bd->name, count); bsg_set_block(bd, file); - bsg_set_write_perm(bd, file); bytes_written = 0; - ret = __bsg_write(bd, buf, count, &bytes_written); + ret = __bsg_write(bd, buf, count, &bytes_written, + file->f_mode & FMODE_WRITE); + *ppos = bytes_written; /* @@ -709,11 +705,12 @@ static void bsg_kref_release_function(struct kref *kref) { struct bsg_class_device *bcd = container_of(kref, struct bsg_class_device, ref); + struct device *parent = bcd->parent; if (bcd->release) bcd->release(bcd->parent); - put_device(bcd->parent); + put_device(parent); } static int bsg_put_device(struct bsg_device *bd) @@ -724,8 +721,13 @@ static int bsg_put_device(struct bsg_device *bd) mutex_lock(&bsg_mutex); do_free = atomic_dec_and_test(&bd->ref_count); - if (!do_free) + if (!do_free) { + mutex_unlock(&bsg_mutex); goto out; + } + + hlist_del(&bd->dev_list); + mutex_unlock(&bsg_mutex); dprintk("%s: tearing down\n", bd->name); @@ -741,10 +743,8 @@ static int bsg_put_device(struct bsg_device *bd) */ ret = bsg_complete_all_commands(bd); - hlist_del(&bd->dev_list); kfree(bd); out: - mutex_unlock(&bsg_mutex); kref_put(&q->bsg_dev.ref, bsg_kref_release_function); if (do_free) blk_put_queue(q); @@ -771,6 +771,7 @@ static struct bsg_device *bsg_add_device(struct inode *inode, } bd->queue = rq; + bsg_set_block(bd, file); atomic_set(&bd->ref_count, 1); @@ -834,7 +835,11 @@ static struct bsg_device *bsg_get_device(struct inode *inode, struct file *file) static int bsg_open(struct inode *inode, struct file *file) { - struct bsg_device *bd = bsg_get_device(inode, file); + struct bsg_device *bd; + + lock_kernel(); + bd = bsg_get_device(inode, file); + unlock_kernel(); if (IS_ERR(bd)) return PTR_ERR(bd); @@ -918,7 +923,7 @@ static long bsg_ioctl(struct file *file, unsigned int cmd, unsigned long arg) if (copy_from_user(&hdr, uarg, sizeof(hdr))) return -EFAULT; - rq = bsg_map_hdr(bd, &hdr); + rq = bsg_map_hdr(bd, &hdr, file->f_mode & FMODE_WRITE); if (IS_ERR(rq)) return PTR_ERR(rq); @@ -1019,7 +1024,7 @@ int bsg_register_queue(struct request_queue *q, struct device *parent, bcd->release = release; kref_init(&bcd->ref); dev = MKDEV(bsg_major, bcd->minor); - class_dev = device_create(bsg_class, parent, dev, "%s", devname); + class_dev = device_create(bsg_class, parent, dev, NULL, "%s", devname); if (IS_ERR(class_dev)) { ret = PTR_ERR(class_dev); goto put_dev; diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c index d01b411c72f0..6a062eebbd15 100644 --- a/block/cfq-iosched.c +++ b/block/cfq-iosched.c @@ -11,6 +11,7 @@ #include <linux/elevator.h> #include <linux/rbtree.h> #include <linux/ioprio.h> +#include <linux/blktrace_api.h> /* * tunables @@ -38,16 +39,18 @@ static int cfq_slice_idle = HZ / 125; #define CFQ_MIN_TT (2) #define CFQ_SLICE_SCALE (5) +#define CFQ_HW_QUEUE_MIN (5) #define RQ_CIC(rq) \ ((struct cfq_io_context *) (rq)->elevator_private) -#define RQ_CFQQ(rq) ((rq)->elevator_private2) +#define RQ_CFQQ(rq) (struct cfq_queue *) ((rq)->elevator_private2) static struct kmem_cache *cfq_pool; static struct kmem_cache *cfq_ioc_pool; static DEFINE_PER_CPU(unsigned long, ioc_count); static struct completion *ioc_gone; +static DEFINE_SPINLOCK(ioc_gone_lock); #define CFQ_PRIO_LISTS IOPRIO_BE_NR #define cfq_class_idle(cfqq) ((cfqq)->ioprio_class == IOPRIO_CLASS_IDLE) @@ -84,7 +87,14 @@ struct cfq_data { int rq_in_driver; int sync_flight; + + /* + * queue-depth detection + */ + int rq_queued; int hw_tag; + int hw_tag_samples; + int rq_in_driver_peak; /* * idle window management @@ -155,6 +165,7 @@ struct cfq_queue { unsigned short ioprio, org_ioprio; unsigned short ioprio_class, org_ioprio_class; + pid_t pid; }; enum cfqq_state_flags { @@ -198,6 +209,11 @@ CFQ_CFQQ_FNS(slice_new); CFQ_CFQQ_FNS(sync); #undef CFQ_CFQQ_FNS +#define cfq_log_cfqq(cfqd, cfqq, fmt, args...) \ + blk_add_trace_msg((cfqd)->queue, "cfq%d " fmt, (cfqq)->pid, ##args) +#define cfq_log(cfqd, fmt, args...) \ + blk_add_trace_msg((cfqd)->queue, "cfq " fmt, ##args) + static void cfq_dispatch_insert(struct request_queue *, struct request *); static struct cfq_queue *cfq_get_queue(struct cfq_data *, int, struct io_context *, gfp_t); @@ -234,8 +250,10 @@ static inline int cfq_bio_sync(struct bio *bio) */ static inline void cfq_schedule_dispatch(struct cfq_data *cfqd) { - if (cfqd->busy_queues) - kblockd_schedule_work(&cfqd->unplug_work); + if (cfqd->busy_queues) { + cfq_log(cfqd, "schedule dispatch"); + kblockd_schedule_work(cfqd->queue, &cfqd->unplug_work); + } } static int cfq_queue_empty(struct request_queue *q) @@ -270,6 +288,7 @@ static inline void cfq_set_prio_slice(struct cfq_data *cfqd, struct cfq_queue *cfqq) { cfqq->slice_end = cfq_prio_to_slice(cfqd, cfqq) + jiffies; + cfq_log_cfqq(cfqd, cfqq, "set_slice=%lu", cfqq->slice_end - jiffies); } /* @@ -539,6 +558,7 @@ static void cfq_resort_rr_list(struct cfq_data *cfqd, struct cfq_queue *cfqq) */ static void cfq_add_cfqq_rr(struct cfq_data *cfqd, struct cfq_queue *cfqq) { + cfq_log_cfqq(cfqd, cfqq, "add_to_rr"); BUG_ON(cfq_cfqq_on_rr(cfqq)); cfq_mark_cfqq_on_rr(cfqq); cfqd->busy_queues++; @@ -552,6 +572,7 @@ static void cfq_add_cfqq_rr(struct cfq_data *cfqd, struct cfq_queue *cfqq) */ static void cfq_del_cfqq_rr(struct cfq_data *cfqd, struct cfq_queue *cfqq) { + cfq_log_cfqq(cfqd, cfqq, "del_from_rr"); BUG_ON(!cfq_cfqq_on_rr(cfqq)); cfq_clear_cfqq_on_rr(cfqq); @@ -638,15 +659,8 @@ static void cfq_activate_request(struct request_queue *q, struct request *rq) struct cfq_data *cfqd = q->elevator->elevator_data; cfqd->rq_in_driver++; - - /* - * If the depth is larger 1, it really could be queueing. But lets - * make the mark a little higher - idling could still be good for - * low queueing, and a low queueing number could also just indicate - * a SCSI mid layer like behaviour where limit+1 is often seen. - */ - if (!cfqd->hw_tag && cfqd->rq_in_driver > 4) - cfqd->hw_tag = 1; + cfq_log_cfqq(cfqd, RQ_CFQQ(rq), "activate rq, drv=%d", + cfqd->rq_in_driver); cfqd->last_position = rq->hard_sector + rq->hard_nr_sectors; } @@ -657,6 +671,8 @@ static void cfq_deactivate_request(struct request_queue *q, struct request *rq) WARN_ON(!cfqd->rq_in_driver); cfqd->rq_in_driver--; + cfq_log_cfqq(cfqd, RQ_CFQQ(rq), "deactivate rq, drv=%d", + cfqd->rq_in_driver); } static void cfq_remove_request(struct request *rq) @@ -669,6 +685,7 @@ static void cfq_remove_request(struct request *rq) list_del_init(&rq->queuelist); cfq_del_rq_rb(rq); + cfqq->cfqd->rq_queued--; if (rq_is_meta(rq)) { WARN_ON(!cfqq->meta_pending); cfqq->meta_pending--; @@ -746,6 +763,7 @@ static void __cfq_set_active_queue(struct cfq_data *cfqd, struct cfq_queue *cfqq) { if (cfqq) { + cfq_log_cfqq(cfqd, cfqq, "set_active"); cfqq->slice_end = 0; cfq_clear_cfqq_must_alloc_slice(cfqq); cfq_clear_cfqq_fifo_expire(cfqq); @@ -763,6 +781,8 @@ static void __cfq_slice_expired(struct cfq_data *cfqd, struct cfq_queue *cfqq, int timed_out) { + cfq_log_cfqq(cfqd, cfqq, "slice expired t=%d", timed_out); + if (cfq_cfqq_wait_request(cfqq)) del_timer(&cfqd->idle_slice_timer); @@ -772,8 +792,10 @@ __cfq_slice_expired(struct cfq_data *cfqd, struct cfq_queue *cfqq, /* * store what was left of this slice, if the queue idled/timed out */ - if (timed_out && !cfq_cfqq_slice_new(cfqq)) + if (timed_out && !cfq_cfqq_slice_new(cfqq)) { cfqq->slice_resid = cfqq->slice_end - jiffies; + cfq_log_cfqq(cfqd, cfqq, "resid=%ld", cfqq->slice_resid); + } cfq_resort_rr_list(cfqd, cfqq); @@ -856,6 +878,14 @@ static void cfq_arm_slice_timer(struct cfq_data *cfqd) struct cfq_io_context *cic; unsigned long sl; + /* + * SSD device without seek penalty, disable idling. But only do so + * for devices that support queuing, otherwise we still have a problem + * with sync vs async workloads. + */ + if (blk_queue_nonrot(cfqd->queue) && cfqd->hw_tag) + return; + WARN_ON(!RB_EMPTY_ROOT(&cfqq->sort_list)); WARN_ON(cfq_cfqq_slice_new(cfqq)); @@ -866,6 +896,12 @@ static void cfq_arm_slice_timer(struct cfq_data *cfqd) return; /* + * still requests with the driver, don't idle + */ + if (cfqd->rq_in_driver) + return; + + /* * task has exited, don't wait */ cic = cfqd->active_cic; @@ -892,6 +928,7 @@ static void cfq_arm_slice_timer(struct cfq_data *cfqd) sl = min(sl, msecs_to_jiffies(CFQ_MIN_TT)); mod_timer(&cfqd->idle_slice_timer, jiffies + sl); + cfq_log(cfqd, "arm_idle: %lu", sl); } /* @@ -902,6 +939,8 @@ static void cfq_dispatch_insert(struct request_queue *q, struct request *rq) struct cfq_data *cfqd = q->elevator->elevator_data; struct cfq_queue *cfqq = RQ_CFQQ(rq); + cfq_log_cfqq(cfqd, cfqq, "dispatch_insert"); + cfq_remove_request(rq); cfqq->dispatched++; elv_dispatch_sort(q, rq); @@ -931,8 +970,9 @@ static struct request *cfq_check_fifo(struct cfq_queue *cfqq) rq = rq_entry_fifo(cfqq->fifo.next); if (time_before(jiffies, rq->start_time + cfqd->cfq_fifo_expire[fifo])) - return NULL; + rq = NULL; + cfq_log_cfqq(cfqd, cfqq, "fifo=%p", rq); return rq; } @@ -1072,6 +1112,7 @@ static int cfq_forced_dispatch(struct cfq_data *cfqd) BUG_ON(cfqd->busy_queues); + cfq_log(cfqd, "forced_dispatch=%d\n", dispatched); return dispatched; } @@ -1112,6 +1153,7 @@ static int cfq_dispatch_requests(struct request_queue *q, int force) dispatched += __cfq_dispatch_requests(cfqd, cfqq, max_dispatch); } + cfq_log(cfqd, "dispatched=%d", dispatched); return dispatched; } @@ -1130,6 +1172,7 @@ static void cfq_put_queue(struct cfq_queue *cfqq) if (!atomic_dec_and_test(&cfqq->ref)) return; + cfq_log_cfqq(cfqd, cfqq, "put_queue"); BUG_ON(rb_first(&cfqq->sort_list)); BUG_ON(cfqq->allocated[READ] + cfqq->allocated[WRITE]); BUG_ON(cfq_cfqq_on_rr(cfqq)); @@ -1177,8 +1220,19 @@ static void cfq_cic_free_rcu(struct rcu_head *head) kmem_cache_free(cfq_ioc_pool, cic); elv_ioc_count_dec(ioc_count); - if (ioc_gone && !elv_ioc_count_read(ioc_count)) - complete(ioc_gone); + if (ioc_gone) { + /* + * CFQ scheduler is exiting, grab exit lock and check + * the pending io context count. If it hits zero, + * complete ioc_gone and set it back to NULL + */ + spin_lock(&ioc_gone_lock); + if (ioc_gone && !elv_ioc_count_read(ioc_count)) { + complete(ioc_gone); + ioc_gone = NULL; + } + spin_unlock(&ioc_gone_lock); + } } static void cfq_cic_free(struct cfq_io_context *cic) @@ -1427,6 +1481,8 @@ retry: cfq_mark_cfqq_idle_window(cfqq); cfq_mark_cfqq_sync(cfqq); } + cfqq->pid = current->pid; + cfq_log_cfqq(cfqd, cfqq, "alloced"); } if (new_cfqq) @@ -1675,7 +1731,7 @@ static void cfq_update_idle_window(struct cfq_data *cfqd, struct cfq_queue *cfqq, struct cfq_io_context *cic) { - int enable_idle; + int old_idle, enable_idle; /* * Don't idle for async or idle io prio class @@ -1683,7 +1739,7 @@ cfq_update_idle_window(struct cfq_data *cfqd, struct cfq_queue *cfqq, if (!cfq_cfqq_sync(cfqq) || cfq_class_idle(cfqq)) return; - enable_idle = cfq_cfqq_idle_window(cfqq); + enable_idle = old_idle = cfq_cfqq_idle_window(cfqq); if (!atomic_read(&cic->ioc->nr_tasks) || !cfqd->cfq_slice_idle || (cfqd->hw_tag && CIC_SEEKY(cic))) @@ -1695,10 +1751,13 @@ cfq_update_idle_window(struct cfq_data *cfqd, struct cfq_queue *cfqq, enable_idle = 1; } - if (enable_idle) - cfq_mark_cfqq_idle_window(cfqq); - else - cfq_clear_cfqq_idle_window(cfqq); + if (old_idle != enable_idle) { + cfq_log_cfqq(cfqd, cfqq, "idle=%d", enable_idle); + if (enable_idle) + cfq_mark_cfqq_idle_window(cfqq); + else + cfq_clear_cfqq_idle_window(cfqq); + } } /* @@ -1757,6 +1816,7 @@ cfq_should_preempt(struct cfq_data *cfqd, struct cfq_queue *new_cfqq, */ static void cfq_preempt_queue(struct cfq_data *cfqd, struct cfq_queue *cfqq) { + cfq_log_cfqq(cfqd, cfqq, "preempt"); cfq_slice_expired(cfqd, 1); /* @@ -1781,6 +1841,7 @@ cfq_rq_enqueued(struct cfq_data *cfqd, struct cfq_queue *cfqq, { struct cfq_io_context *cic = RQ_CIC(rq); + cfqd->rq_queued++; if (rq_is_meta(rq)) cfqq->meta_pending++; @@ -1818,6 +1879,7 @@ static void cfq_insert_request(struct request_queue *q, struct request *rq) struct cfq_data *cfqd = q->elevator->elevator_data; struct cfq_queue *cfqq = RQ_CFQQ(rq); + cfq_log_cfqq(cfqd, cfqq, "insert_request"); cfq_init_prio_data(cfqq, RQ_CIC(rq)->ioc); cfq_add_rq_rb(rq); @@ -1827,6 +1889,31 @@ static void cfq_insert_request(struct request_queue *q, struct request *rq) cfq_rq_enqueued(cfqd, cfqq, rq); } +/* + * Update hw_tag based on peak queue depth over 50 samples under + * sufficient load. + */ +static void cfq_update_hw_tag(struct cfq_data *cfqd) +{ + if (cfqd->rq_in_driver > cfqd->rq_in_driver_peak) + cfqd->rq_in_driver_peak = cfqd->rq_in_driver; + + if (cfqd->rq_queued <= CFQ_HW_QUEUE_MIN && + cfqd->rq_in_driver <= CFQ_HW_QUEUE_MIN) + return; + + if (cfqd->hw_tag_samples++ < 50) + return; + + if (cfqd->rq_in_driver_peak >= CFQ_HW_QUEUE_MIN) + cfqd->hw_tag = 1; + else + cfqd->hw_tag = 0; + + cfqd->hw_tag_samples = 0; + cfqd->rq_in_driver_peak = 0; +} + static void cfq_completed_request(struct request_queue *q, struct request *rq) { struct cfq_queue *cfqq = RQ_CFQQ(rq); @@ -1835,6 +1922,9 @@ static void cfq_completed_request(struct request_queue *q, struct request *rq) unsigned long now; now = jiffies; + cfq_log_cfqq(cfqd, cfqq, "complete"); + + cfq_update_hw_tag(cfqd); WARN_ON(!cfqd->rq_in_driver); WARN_ON(!cfqq->dispatched); @@ -2004,6 +2094,7 @@ queue_fail: cfq_schedule_dispatch(cfqd); spin_unlock_irqrestore(q->queue_lock, flags); + cfq_log(cfqd, "set_request fail"); return 1; } @@ -2029,6 +2120,8 @@ static void cfq_idle_slice_timer(unsigned long data) unsigned long flags; int timed_out = 1; + cfq_log(cfqd, "idle timer fired"); + spin_lock_irqsave(cfqd->queue->queue_lock, flags); cfqq = cfqd->active_queue; @@ -2143,6 +2236,7 @@ static void *cfq_init_queue(struct request_queue *q) cfqd->cfq_slice[1] = cfq_slice_sync; cfqd->cfq_slice_async_rq = cfq_slice_async_rq; cfqd->cfq_slice_idle = cfq_slice_idle; + cfqd->hw_tag = 1; return cfqd; } @@ -2317,7 +2411,7 @@ static void __exit cfq_exit(void) * pending RCU callbacks */ if (elv_ioc_count_read(ioc_count)) - wait_for_completion(ioc_gone); + wait_for_completion(&all_gone); cfq_slab_kill(); } diff --git a/block/cmd-filter.c b/block/cmd-filter.c new file mode 100644 index 000000000000..e669aed4c6bc --- /dev/null +++ b/block/cmd-filter.c @@ -0,0 +1,232 @@ +/* + * Copyright 2004 Peter M. Jones <pjones@redhat.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public Licens + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111- + * + */ + +#include <linux/list.h> +#include <linux/genhd.h> +#include <linux/spinlock.h> +#include <linux/capability.h> +#include <linux/bitops.h> + +#include <scsi/scsi.h> +#include <linux/cdrom.h> + +int blk_verify_command(struct blk_cmd_filter *filter, + unsigned char *cmd, int has_write_perm) +{ + /* root can do any command. */ + if (capable(CAP_SYS_RAWIO)) + return 0; + + /* if there's no filter set, assume we're filtering everything out */ + if (!filter) + return -EPERM; + + /* Anybody who can open the device can do a read-safe command */ + if (test_bit(cmd[0], filter->read_ok)) + return 0; + + /* Write-safe commands require a writable open */ + if (test_bit(cmd[0], filter->write_ok) && has_write_perm) + return 0; + + return -EPERM; +} +EXPORT_SYMBOL(blk_verify_command); + +#if 0 +/* and now, the sysfs stuff */ +static ssize_t rcf_cmds_show(struct blk_cmd_filter *filter, char *page, + int rw) +{ + char *npage = page; + unsigned long *okbits; + int i; + + if (rw == READ) + okbits = filter->read_ok; + else + okbits = filter->write_ok; + + for (i = 0; i < BLK_SCSI_MAX_CMDS; i++) { + if (test_bit(i, okbits)) { + npage += sprintf(npage, "0x%02x", i); + if (i < BLK_SCSI_MAX_CMDS - 1) + sprintf(npage++, " "); + } + } + + if (npage != page) + npage += sprintf(npage, "\n"); + + return npage - page; +} + +static ssize_t rcf_readcmds_show(struct blk_cmd_filter *filter, char *page) +{ + return rcf_cmds_show(filter, page, READ); +} + +static ssize_t rcf_writecmds_show(struct blk_cmd_filter *filter, + char *page) +{ + return rcf_cmds_show(filter, page, WRITE); +} + +static ssize_t rcf_cmds_store(struct blk_cmd_filter *filter, + const char *page, size_t count, int rw) +{ + unsigned long okbits[BLK_SCSI_CMD_PER_LONG], *target_okbits; + int cmd, set; + char *p, *status; + + if (rw == READ) { + memcpy(&okbits, filter->read_ok, sizeof(okbits)); + target_okbits = filter->read_ok; + } else { + memcpy(&okbits, filter->write_ok, sizeof(okbits)); + target_okbits = filter->write_ok; + } + + while ((p = strsep((char **)&page, " ")) != NULL) { + set = 1; + + if (p[0] == '+') { + p++; + } else if (p[0] == '-') { + set = 0; + p++; + } + + cmd = simple_strtol(p, &status, 16); + + /* either of these cases means invalid input, so do nothing. */ + if ((status == p) || cmd >= BLK_SCSI_MAX_CMDS) + return -EINVAL; + + if (set) + __set_bit(cmd, okbits); + else + __clear_bit(cmd, okbits); + } + + memcpy(target_okbits, okbits, sizeof(okbits)); + return count; +} + +static ssize_t rcf_readcmds_store(struct blk_cmd_filter *filter, + const char *page, size_t count) +{ + return rcf_cmds_store(filter, page, count, READ); +} + +static ssize_t rcf_writecmds_store(struct blk_cmd_filter *filter, + const char *page, size_t count) +{ + return rcf_cmds_store(filter, page, count, WRITE); +} + +struct rcf_sysfs_entry { + struct attribute attr; + ssize_t (*show)(struct blk_cmd_filter *, char *); + ssize_t (*store)(struct blk_cmd_filter *, const char *, size_t); +}; + +static struct rcf_sysfs_entry rcf_readcmds_entry = { + .attr = { .name = "read_table", .mode = S_IRUGO | S_IWUSR }, + .show = rcf_readcmds_show, + .store = rcf_readcmds_store, +}; + +static struct rcf_sysfs_entry rcf_writecmds_entry = { + .attr = {.name = "write_table", .mode = S_IRUGO | S_IWUSR }, + .show = rcf_writecmds_show, + .store = rcf_writecmds_store, +}; + +static struct attribute *default_attrs[] = { + &rcf_readcmds_entry.attr, + &rcf_writecmds_entry.attr, + NULL, +}; + +#define to_rcf(atr) container_of((atr), struct rcf_sysfs_entry, attr) + +static ssize_t +rcf_attr_show(struct kobject *kobj, struct attribute *attr, char *page) +{ + struct rcf_sysfs_entry *entry = to_rcf(attr); + struct blk_cmd_filter *filter; + + filter = container_of(kobj, struct blk_cmd_filter, kobj); + if (entry->show) + return entry->show(filter, page); + + return 0; +} + +static ssize_t +rcf_attr_store(struct kobject *kobj, struct attribute *attr, + const char *page, size_t length) +{ + struct rcf_sysfs_entry *entry = to_rcf(attr); + struct blk_cmd_filter *filter; + + if (!capable(CAP_SYS_RAWIO)) + return -EPERM; + + if (!entry->store) + return -EINVAL; + + filter = container_of(kobj, struct blk_cmd_filter, kobj); + return entry->store(filter, page, length); +} + +static struct sysfs_ops rcf_sysfs_ops = { + .show = rcf_attr_show, + .store = rcf_attr_store, +}; + +static struct kobj_type rcf_ktype = { + .sysfs_ops = &rcf_sysfs_ops, + .default_attrs = default_attrs, +}; + +int blk_register_filter(struct gendisk *disk) +{ + int ret; + struct blk_cmd_filter *filter = &disk->queue->cmd_filter; + + ret = kobject_init_and_add(&filter->kobj, &rcf_ktype, + &disk_to_dev(disk)->kobj, + "%s", "cmd_filter"); + if (ret < 0) + return ret; + + return 0; +} +EXPORT_SYMBOL(blk_register_filter); + +void blk_unregister_filter(struct gendisk *disk) +{ + struct blk_cmd_filter *filter = &disk->queue->cmd_filter; + + kobject_put(&filter->kobj); +} +EXPORT_SYMBOL(blk_unregister_filter); +#endif diff --git a/block/compat_ioctl.c b/block/compat_ioctl.c index c23177e4623f..1e559fba7bdf 100644 --- a/block/compat_ioctl.c +++ b/block/compat_ioctl.c @@ -788,6 +788,7 @@ long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg) return compat_hdio_getgeo(disk, bdev, compat_ptr(arg)); case BLKFLSBUF: case BLKROSET: + case BLKDISCARD: /* * the ones below are implemented in blkdev_locked_ioctl, * but we call blkdev_ioctl, which gets the lock for us diff --git a/block/deadline-iosched.c b/block/deadline-iosched.c index 342448c3d2dd..fd311179f44c 100644 --- a/block/deadline-iosched.c +++ b/block/deadline-iosched.c @@ -33,7 +33,7 @@ struct deadline_data { */ struct rb_root sort_list[2]; struct list_head fifo_list[2]; - + /* * next in sort order. read, write or both are NULL */ @@ -53,7 +53,11 @@ struct deadline_data { static void deadline_move_request(struct deadline_data *, struct request *); -#define RQ_RB_ROOT(dd, rq) (&(dd)->sort_list[rq_data_dir((rq))]) +static inline struct rb_root * +deadline_rb_root(struct deadline_data *dd, struct request *rq) +{ + return &dd->sort_list[rq_data_dir(rq)]; +} /* * get the request after `rq' in sector-sorted order @@ -72,15 +76,11 @@ deadline_latter_request(struct request *rq) static void deadline_add_rq_rb(struct deadline_data *dd, struct request *rq) { - struct rb_root *root = RQ_RB_ROOT(dd, rq); + struct rb_root *root = deadline_rb_root(dd, rq); struct request *__alias; -retry: - __alias = elv_rb_add(root, rq); - if (unlikely(__alias)) { + while (unlikely(__alias = elv_rb_add(root, rq))) deadline_move_request(dd, __alias); - goto retry; - } } static inline void @@ -91,7 +91,7 @@ deadline_del_rq_rb(struct deadline_data *dd, struct request *rq) if (dd->next_rq[data_dir] == rq) dd->next_rq[data_dir] = deadline_latter_request(rq); - elv_rb_del(RQ_RB_ROOT(dd, rq), rq); + elv_rb_del(deadline_rb_root(dd, rq), rq); } /* @@ -106,7 +106,7 @@ deadline_add_request(struct request_queue *q, struct request *rq) deadline_add_rq_rb(dd, rq); /* - * set expire time (only used for reads) and add to fifo list + * set expire time and add to fifo list */ rq_set_fifo_time(rq, jiffies + dd->fifo_expire[data_dir]); list_add_tail(&rq->queuelist, &dd->fifo_list[data_dir]); @@ -162,7 +162,7 @@ static void deadline_merged_request(struct request_queue *q, * if the merge was a front merge, we need to reposition request */ if (type == ELEVATOR_FRONT_MERGE) { - elv_rb_del(RQ_RB_ROOT(dd, req), req); + elv_rb_del(deadline_rb_root(dd, req), req); deadline_add_rq_rb(dd, req); } } @@ -212,7 +212,7 @@ deadline_move_request(struct deadline_data *dd, struct request *rq) dd->next_rq[WRITE] = NULL; dd->next_rq[data_dir] = deadline_latter_request(rq); - dd->last_sector = rq->sector + rq->nr_sectors; + dd->last_sector = rq_end_sector(rq); /* * take it off the sort and fifo list, move @@ -222,7 +222,7 @@ deadline_move_request(struct deadline_data *dd, struct request *rq) } /* - * deadline_check_fifo returns 0 if there are no expired reads on the fifo, + * deadline_check_fifo returns 0 if there are no expired requests on the fifo, * 1 otherwise. Requires !list_empty(&dd->fifo_list[data_dir]) */ static inline int deadline_check_fifo(struct deadline_data *dd, int ddir) @@ -258,17 +258,9 @@ static int deadline_dispatch_requests(struct request_queue *q, int force) else rq = dd->next_rq[READ]; - if (rq) { - /* we have a "next request" */ - - if (dd->last_sector != rq->sector) - /* end the batch on a non sequential request */ - dd->batching += dd->fifo_batch; - - if (dd->batching < dd->fifo_batch) - /* we are still entitled to batch */ - goto dispatch_request; - } + if (rq && dd->batching < dd->fifo_batch) + /* we have a next request are still entitled to batch */ + goto dispatch_request; /* * at this point we are not running a batch. select the appropriate diff --git a/block/elevator.c b/block/elevator.c index 902dd1344d56..04518921db31 100644 --- a/block/elevator.c +++ b/block/elevator.c @@ -34,8 +34,9 @@ #include <linux/delay.h> #include <linux/blktrace_api.h> #include <linux/hash.h> +#include <linux/uaccess.h> -#include <asm/uaccess.h> +#include "blk.h" static DEFINE_SPINLOCK(elv_list_lock); static LIST_HEAD(elv_list); @@ -75,6 +76,12 @@ int elv_rq_merge_ok(struct request *rq, struct bio *bio) return 0; /* + * Don't merge file system requests and discard requests + */ + if (bio_discard(bio) != bio_discard(rq->bio)) + return 0; + + /* * different data direction or already started, don't merge */ if (bio_data_dir(bio) != rq_data_dir(rq)) @@ -86,6 +93,12 @@ int elv_rq_merge_ok(struct request *rq, struct bio *bio) if (rq->rq_disk != bio->bi_bdev->bd_disk || rq->special) return 0; + /* + * only merge integrity protected bio into ditto rq + */ + if (bio_integrity(bio) != blk_integrity_rq(rq)) + return 0; + if (!elv_iosched_allow_merge(rq, bio)) return 0; @@ -144,7 +157,7 @@ static struct elevator_type *elevator_get(const char *name) else sprintf(elv, "%s-iosched", name); - request_module(elv); + request_module("%s", elv); spin_lock(&elv_list_lock); e = elevator_find(name); } @@ -432,6 +445,8 @@ void elv_dispatch_sort(struct request_queue *q, struct request *rq) list_for_each_prev(entry, &q->queue_head) { struct request *pos = list_entry_rq(entry); + if (blk_discard_rq(rq) != blk_discard_rq(pos)) + break; if (rq_data_dir(rq) != rq_data_dir(pos)) break; if (pos->cmd_flags & stop_flags) @@ -601,7 +616,7 @@ void elv_insert(struct request_queue *q, struct request *rq, int where) break; case ELEVATOR_INSERT_SORT: - BUG_ON(!blk_fs_request(rq)); + BUG_ON(!blk_fs_request(rq) && !blk_discard_rq(rq)); rq->cmd_flags |= REQ_SORTED; q->nr_sorted++; if (rq_mergeable(rq)) { @@ -686,7 +701,7 @@ void __elv_add_request(struct request_queue *q, struct request *rq, int where, * this request is scheduling boundary, update * end_sector */ - if (blk_fs_request(rq)) { + if (blk_fs_request(rq) || blk_discard_rq(rq)) { q->end_sector = rq_end_sector(rq); q->boundary_rq = rq; } @@ -739,7 +754,7 @@ struct request *elv_next_request(struct request_queue *q) * not ever see it. */ if (blk_empty_barrier(rq)) { - end_queued_request(rq, 1); + __blk_end_request(rq, 0, blk_rq_bytes(rq)); continue; } if (!(rq->cmd_flags & REQ_STARTED)) { @@ -758,6 +773,12 @@ struct request *elv_next_request(struct request_queue *q) */ rq->cmd_flags |= REQ_STARTED; blk_add_trace_rq(q, rq, BLK_TA_ISSUE); + + /* + * We are now handing the request to the hardware, + * add the timeout handler + */ + blk_add_timer(rq); } if (!q->boundary_rq || q->boundary_rq == rq) { @@ -776,7 +797,6 @@ struct request *elv_next_request(struct request_queue *q) * device can handle */ rq->nr_phys_segments++; - rq->nr_hw_segments++; } if (!q->prep_rq_fn) @@ -799,14 +819,13 @@ struct request *elv_next_request(struct request_queue *q) * so that we don't add it again */ --rq->nr_phys_segments; - --rq->nr_hw_segments; } rq = NULL; break; } else if (ret == BLKPREP_KILL) { rq->cmd_flags |= REQ_QUIET; - end_queued_request(rq, 0); + __blk_end_request(rq, -EIO, blk_rq_bytes(rq)); } else { printk(KERN_ERR "%s: bad return=%d\n", __func__, ret); break; @@ -895,6 +914,19 @@ int elv_may_queue(struct request_queue *q, int rw) return ELV_MQUEUE_MAY; } +void elv_abort_queue(struct request_queue *q) +{ + struct request *rq; + + while (!list_empty(&q->queue_head)) { + rq = list_entry_rq(q->queue_head.next); + rq->cmd_flags |= REQ_QUIET; + blk_add_trace_rq(q, rq, BLK_TA_ABORT); + __blk_end_request(rq, -EIO, blk_rq_bytes(rq)); + } +} +EXPORT_SYMBOL(elv_abort_queue); + void elv_completed_request(struct request_queue *q, struct request *rq) { elevator_t *e = q->elevator; diff --git a/block/genhd.c b/block/genhd.c index b922d4801c87..4cd3433c99ac 100644 --- a/block/genhd.c +++ b/block/genhd.c @@ -16,6 +16,7 @@ #include <linux/kobj_map.h> #include <linux/buffer_head.h> #include <linux/mutex.h> +#include <linux/idr.h> #include "blk.h" @@ -24,8 +25,194 @@ static DEFINE_MUTEX(block_class_lock); struct kobject *block_depr; #endif +/* for extended dynamic devt allocation, currently only one major is used */ +#define MAX_EXT_DEVT (1 << MINORBITS) + +/* For extended devt allocation. ext_devt_mutex prevents look up + * results from going away underneath its user. + */ +static DEFINE_MUTEX(ext_devt_mutex); +static DEFINE_IDR(ext_devt_idr); + static struct device_type disk_type; +/** + * disk_get_part - get partition + * @disk: disk to look partition from + * @partno: partition number + * + * Look for partition @partno from @disk. If found, increment + * reference count and return it. + * + * CONTEXT: + * Don't care. + * + * RETURNS: + * Pointer to the found partition on success, NULL if not found. + */ +struct hd_struct *disk_get_part(struct gendisk *disk, int partno) +{ + struct hd_struct *part = NULL; + struct disk_part_tbl *ptbl; + + if (unlikely(partno < 0)) + return NULL; + + rcu_read_lock(); + + ptbl = rcu_dereference(disk->part_tbl); + if (likely(partno < ptbl->len)) { + part = rcu_dereference(ptbl->part[partno]); + if (part) + get_device(part_to_dev(part)); + } + + rcu_read_unlock(); + + return part; +} +EXPORT_SYMBOL_GPL(disk_get_part); + +/** + * disk_part_iter_init - initialize partition iterator + * @piter: iterator to initialize + * @disk: disk to iterate over + * @flags: DISK_PITER_* flags + * + * Initialize @piter so that it iterates over partitions of @disk. + * + * CONTEXT: + * Don't care. + */ +void disk_part_iter_init(struct disk_part_iter *piter, struct gendisk *disk, + unsigned int flags) +{ + struct disk_part_tbl *ptbl; + + rcu_read_lock(); + ptbl = rcu_dereference(disk->part_tbl); + + piter->disk = disk; + piter->part = NULL; + + if (flags & DISK_PITER_REVERSE) + piter->idx = ptbl->len - 1; + else if (flags & DISK_PITER_INCL_PART0) + piter->idx = 0; + else + piter->idx = 1; + + piter->flags = flags; + + rcu_read_unlock(); +} +EXPORT_SYMBOL_GPL(disk_part_iter_init); + +/** + * disk_part_iter_next - proceed iterator to the next partition and return it + * @piter: iterator of interest + * + * Proceed @piter to the next partition and return it. + * + * CONTEXT: + * Don't care. + */ +struct hd_struct *disk_part_iter_next(struct disk_part_iter *piter) +{ + struct disk_part_tbl *ptbl; + int inc, end; + + /* put the last partition */ + disk_put_part(piter->part); + piter->part = NULL; + + /* get part_tbl */ + rcu_read_lock(); + ptbl = rcu_dereference(piter->disk->part_tbl); + + /* determine iteration parameters */ + if (piter->flags & DISK_PITER_REVERSE) { + inc = -1; + if (piter->flags & DISK_PITER_INCL_PART0) + end = -1; + else + end = 0; + } else { + inc = 1; + end = ptbl->len; + } + + /* iterate to the next partition */ + for (; piter->idx != end; piter->idx += inc) { + struct hd_struct *part; + + part = rcu_dereference(ptbl->part[piter->idx]); + if (!part) + continue; + if (!(piter->flags & DISK_PITER_INCL_EMPTY) && !part->nr_sects) + continue; + + get_device(part_to_dev(part)); + piter->part = part; + piter->idx += inc; + break; + } + + rcu_read_unlock(); + + return piter->part; +} +EXPORT_SYMBOL_GPL(disk_part_iter_next); + +/** + * disk_part_iter_exit - finish up partition iteration + * @piter: iter of interest + * + * Called when iteration is over. Cleans up @piter. + * + * CONTEXT: + * Don't care. + */ +void disk_part_iter_exit(struct disk_part_iter *piter) +{ + disk_put_part(piter->part); + piter->part = NULL; +} +EXPORT_SYMBOL_GPL(disk_part_iter_exit); + +/** + * disk_map_sector_rcu - map sector to partition + * @disk: gendisk of interest + * @sector: sector to map + * + * Find out which partition @sector maps to on @disk. This is + * primarily used for stats accounting. + * + * CONTEXT: + * RCU read locked. The returned partition pointer is valid only + * while preemption is disabled. + * + * RETURNS: + * Found partition on success, part0 is returned if no partition matches + */ +struct hd_struct *disk_map_sector_rcu(struct gendisk *disk, sector_t sector) +{ + struct disk_part_tbl *ptbl; + int i; + + ptbl = rcu_dereference(disk->part_tbl); + + for (i = 1; i < ptbl->len; i++) { + struct hd_struct *part = rcu_dereference(ptbl->part[i]); + + if (part && part->start_sect <= sector && + sector < part->start_sect + part->nr_sects) + return part; + } + return &disk->part0; +} +EXPORT_SYMBOL_GPL(disk_map_sector_rcu); + /* * Can be deleted altogether. Later. * @@ -43,14 +230,14 @@ static inline int major_to_index(int major) } #ifdef CONFIG_PROC_FS -void blkdev_show(struct seq_file *f, off_t offset) +void blkdev_show(struct seq_file *seqf, off_t offset) { struct blk_major_name *dp; if (offset < BLKDEV_MAJOR_HASH_SIZE) { mutex_lock(&block_class_lock); for (dp = major_names[offset]; dp; dp = dp->next) - seq_printf(f, "%3d %s\n", dp->major, dp->name); + seq_printf(seqf, "%3d %s\n", dp->major, dp->name); mutex_unlock(&block_class_lock); } } @@ -136,6 +323,118 @@ EXPORT_SYMBOL(unregister_blkdev); static struct kobj_map *bdev_map; +/** + * blk_mangle_minor - scatter minor numbers apart + * @minor: minor number to mangle + * + * Scatter consecutively allocated @minor number apart if MANGLE_DEVT + * is enabled. Mangling twice gives the original value. + * + * RETURNS: + * Mangled value. + * + * CONTEXT: + * Don't care. + */ +static int blk_mangle_minor(int minor) +{ +#ifdef CONFIG_DEBUG_BLOCK_EXT_DEVT + int i; + + for (i = 0; i < MINORBITS / 2; i++) { + int low = minor & (1 << i); + int high = minor & (1 << (MINORBITS - 1 - i)); + int distance = MINORBITS - 1 - 2 * i; + + minor ^= low | high; /* clear both bits */ + low <<= distance; /* swap the positions */ + high >>= distance; + minor |= low | high; /* and set */ + } +#endif + return minor; +} + +/** + * blk_alloc_devt - allocate a dev_t for a partition + * @part: partition to allocate dev_t for + * @gfp_mask: memory allocation flag + * @devt: out parameter for resulting dev_t + * + * Allocate a dev_t for block device. + * + * RETURNS: + * 0 on success, allocated dev_t is returned in *@devt. -errno on + * failure. + * + * CONTEXT: + * Might sleep. + */ +int blk_alloc_devt(struct hd_struct *part, dev_t *devt) +{ + struct gendisk *disk = part_to_disk(part); + int idx, rc; + + /* in consecutive minor range? */ + if (part->partno < disk->minors) { + *devt = MKDEV(disk->major, disk->first_minor + part->partno); + return 0; + } + + /* allocate ext devt */ + do { + if (!idr_pre_get(&ext_devt_idr, GFP_KERNEL)) + return -ENOMEM; + rc = idr_get_new(&ext_devt_idr, part, &idx); + } while (rc == -EAGAIN); + + if (rc) + return rc; + + if (idx > MAX_EXT_DEVT) { + idr_remove(&ext_devt_idr, idx); + return -EBUSY; + } + + *devt = MKDEV(BLOCK_EXT_MAJOR, blk_mangle_minor(idx)); + return 0; +} + +/** + * blk_free_devt - free a dev_t + * @devt: dev_t to free + * + * Free @devt which was allocated using blk_alloc_devt(). + * + * CONTEXT: + * Might sleep. + */ +void blk_free_devt(dev_t devt) +{ + might_sleep(); + + if (devt == MKDEV(0, 0)) + return; + + if (MAJOR(devt) == BLOCK_EXT_MAJOR) { + mutex_lock(&ext_devt_mutex); + idr_remove(&ext_devt_idr, blk_mangle_minor(MINOR(devt))); + mutex_unlock(&ext_devt_mutex); + } +} + +static char *bdevt_str(dev_t devt, char *buf) +{ + if (MAJOR(devt) <= 0xff && MINOR(devt) <= 0xff) { + char tbuf[BDEVT_SIZE]; + snprintf(tbuf, BDEVT_SIZE, "%02x%02x", MAJOR(devt), MINOR(devt)); + snprintf(buf, BDEVT_SIZE, "%-9s", tbuf); + } else + snprintf(buf, BDEVT_SIZE, "%03x:%05x", MAJOR(devt), MINOR(devt)); + + return buf; +} + /* * Register device numbers dev..(dev+range-1) * range must be nonzero @@ -157,11 +456,11 @@ void blk_unregister_region(dev_t devt, unsigned long range) EXPORT_SYMBOL(blk_unregister_region); -static struct kobject *exact_match(dev_t devt, int *part, void *data) +static struct kobject *exact_match(dev_t devt, int *partno, void *data) { struct gendisk *p = data; - return &p->dev.kobj; + return &disk_to_dev(p)->kobj; } static int exact_lock(dev_t devt, void *data) @@ -179,20 +478,47 @@ static int exact_lock(dev_t devt, void *data) * * This function registers the partitioning information in @disk * with the kernel. + * + * FIXME: error handling */ void add_disk(struct gendisk *disk) { struct backing_dev_info *bdi; + dev_t devt; + int retval; + + /* minors == 0 indicates to use ext devt from part0 and should + * be accompanied with EXT_DEVT flag. Make sure all + * parameters make sense. + */ + WARN_ON(disk->minors && !(disk->major || disk->first_minor)); + WARN_ON(!disk->minors && !(disk->flags & GENHD_FL_EXT_DEVT)); disk->flags |= GENHD_FL_UP; - blk_register_region(MKDEV(disk->major, disk->first_minor), - disk->minors, NULL, exact_match, exact_lock, disk); + + retval = blk_alloc_devt(&disk->part0, &devt); + if (retval) { + WARN_ON(1); + return; + } + disk_to_dev(disk)->devt = devt; + + /* ->major and ->first_minor aren't supposed to be + * dereferenced from here on, but set them just in case. + */ + disk->major = MAJOR(devt); + disk->first_minor = MINOR(devt); + + blk_register_region(disk_devt(disk), disk->minors, NULL, + exact_match, exact_lock, disk); register_disk(disk); blk_register_queue(disk); bdi = &disk->queue->backing_dev_info; - bdi_register_dev(bdi, MKDEV(disk->major, disk->first_minor)); - sysfs_create_link(&disk->dev.kobj, &bdi->dev->kobj, "bdi"); + bdi_register_dev(bdi, disk_devt(disk)); + retval = sysfs_create_link(&disk_to_dev(disk)->kobj, &bdi->dev->kobj, + "bdi"); + WARN_ON(retval); } EXPORT_SYMBOL(add_disk); @@ -200,27 +526,71 @@ EXPORT_SYMBOL(del_gendisk); /* in partitions/check.c */ void unlink_gendisk(struct gendisk *disk) { - sysfs_remove_link(&disk->dev.kobj, "bdi"); + sysfs_remove_link(&disk_to_dev(disk)->kobj, "bdi"); bdi_unregister(&disk->queue->backing_dev_info); blk_unregister_queue(disk); - blk_unregister_region(MKDEV(disk->major, disk->first_minor), - disk->minors); + blk_unregister_region(disk_devt(disk), disk->minors); } /** * get_gendisk - get partitioning information for a given device - * @dev: device to get partitioning information for + * @devt: device to get partitioning information for + * @part: returned partition index * * This function gets the structure containing partitioning - * information for the given device @dev. + * information for the given device @devt. + */ +struct gendisk *get_gendisk(dev_t devt, int *partno) +{ + struct gendisk *disk = NULL; + + if (MAJOR(devt) != BLOCK_EXT_MAJOR) { + struct kobject *kobj; + + kobj = kobj_lookup(bdev_map, devt, partno); + if (kobj) + disk = dev_to_disk(kobj_to_dev(kobj)); + } else { + struct hd_struct *part; + + mutex_lock(&ext_devt_mutex); + part = idr_find(&ext_devt_idr, blk_mangle_minor(MINOR(devt))); + if (part && get_disk(part_to_disk(part))) { + *partno = part->partno; + disk = part_to_disk(part); + } + mutex_unlock(&ext_devt_mutex); + } + + return disk; +} + +/** + * bdget_disk - do bdget() by gendisk and partition number + * @disk: gendisk of interest + * @partno: partition number + * + * Find partition @partno from @disk, do bdget() on it. + * + * CONTEXT: + * Don't care. + * + * RETURNS: + * Resulting block_device on success, NULL on failure. */ -struct gendisk *get_gendisk(dev_t devt, int *part) +struct block_device *bdget_disk(struct gendisk *disk, int partno) { - struct kobject *kobj = kobj_lookup(bdev_map, devt, part); - struct device *dev = kobj_to_dev(kobj); + struct hd_struct *part; + struct block_device *bdev = NULL; + + part = disk_get_part(disk, partno); + if (part) + bdev = bdget(part_devt(part)); + disk_put_part(part); - return kobj ? dev_to_disk(dev) : NULL; + return bdev; } +EXPORT_SYMBOL(bdget_disk); /* * print a full list of all partitions - intended for places where the root @@ -229,136 +599,145 @@ struct gendisk *get_gendisk(dev_t devt, int *part) */ void __init printk_all_partitions(void) { + struct class_dev_iter iter; struct device *dev; - struct gendisk *sgp; - char buf[BDEVNAME_SIZE]; - int n; - mutex_lock(&block_class_lock); - /* For each block device... */ - list_for_each_entry(dev, &block_class.devices, node) { - if (dev->type != &disk_type) - continue; - sgp = dev_to_disk(dev); + class_dev_iter_init(&iter, &block_class, NULL, &disk_type); + while ((dev = class_dev_iter_next(&iter))) { + struct gendisk *disk = dev_to_disk(dev); + struct disk_part_iter piter; + struct hd_struct *part; + char name_buf[BDEVNAME_SIZE]; + char devt_buf[BDEVT_SIZE]; + /* - * Don't show empty devices or things that have been surpressed + * Don't show empty devices or things that have been + * surpressed */ - if (get_capacity(sgp) == 0 || - (sgp->flags & GENHD_FL_SUPPRESS_PARTITION_INFO)) + if (get_capacity(disk) == 0 || + (disk->flags & GENHD_FL_SUPPRESS_PARTITION_INFO)) continue; /* - * Note, unlike /proc/partitions, I am showing the numbers in - * hex - the same format as the root= option takes. + * Note, unlike /proc/partitions, I am showing the + * numbers in hex - the same format as the root= + * option takes. */ - printk("%02x%02x %10llu %s", - sgp->major, sgp->first_minor, - (unsigned long long)get_capacity(sgp) >> 1, - disk_name(sgp, 0, buf)); - if (sgp->driverfs_dev != NULL && - sgp->driverfs_dev->driver != NULL) - printk(" driver: %s\n", - sgp->driverfs_dev->driver->name); - else - printk(" (driver?)\n"); - - /* now show the partitions */ - for (n = 0; n < sgp->minors - 1; ++n) { - if (sgp->part[n] == NULL) - continue; - if (sgp->part[n]->nr_sects == 0) - continue; - printk(" %02x%02x %10llu %s\n", - sgp->major, n + 1 + sgp->first_minor, - (unsigned long long)sgp->part[n]->nr_sects >> 1, - disk_name(sgp, n + 1, buf)); + disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0); + while ((part = disk_part_iter_next(&piter))) { + bool is_part0 = part == &disk->part0; + + printk("%s%s %10llu %s", is_part0 ? "" : " ", + bdevt_str(part_devt(part), devt_buf), + (unsigned long long)part->nr_sects >> 1, + disk_name(disk, part->partno, name_buf)); + if (is_part0) { + if (disk->driverfs_dev != NULL && + disk->driverfs_dev->driver != NULL) + printk(" driver: %s\n", + disk->driverfs_dev->driver->name); + else + printk(" (driver?)\n"); + } else + printk("\n"); } + disk_part_iter_exit(&piter); } - - mutex_unlock(&block_class_lock); + class_dev_iter_exit(&iter); } #ifdef CONFIG_PROC_FS /* iterator */ -static void *part_start(struct seq_file *part, loff_t *pos) +static void *disk_seqf_start(struct seq_file *seqf, loff_t *pos) { - loff_t k = *pos; + loff_t skip = *pos; + struct class_dev_iter *iter; struct device *dev; - mutex_lock(&block_class_lock); - list_for_each_entry(dev, &block_class.devices, node) { - if (dev->type != &disk_type) - continue; - if (!k--) - return dev_to_disk(dev); - } - return NULL; + iter = kmalloc(sizeof(*iter), GFP_KERNEL); + if (!iter) + return ERR_PTR(-ENOMEM); + + seqf->private = iter; + class_dev_iter_init(iter, &block_class, NULL, &disk_type); + do { + dev = class_dev_iter_next(iter); + if (!dev) + return NULL; + } while (skip--); + + return dev_to_disk(dev); } -static void *part_next(struct seq_file *part, void *v, loff_t *pos) +static void *disk_seqf_next(struct seq_file *seqf, void *v, loff_t *pos) { - struct gendisk *gp = v; struct device *dev; - ++*pos; - list_for_each_entry(dev, &gp->dev.node, node) { - if (&dev->node == &block_class.devices) - return NULL; - if (dev->type == &disk_type) - return dev_to_disk(dev); - } + + (*pos)++; + dev = class_dev_iter_next(seqf->private); + if (dev) + return dev_to_disk(dev); + return NULL; } -static void part_stop(struct seq_file *part, void *v) +static void disk_seqf_stop(struct seq_file *seqf, void *v) { - mutex_unlock(&block_class_lock); + struct class_dev_iter *iter = seqf->private; + + /* stop is called even after start failed :-( */ + if (iter) { + class_dev_iter_exit(iter); + kfree(iter); + } } -static int show_partition(struct seq_file *part, void *v) +static void *show_partition_start(struct seq_file *seqf, loff_t *pos) +{ + static void *p; + + p = disk_seqf_start(seqf, pos); + if (!IS_ERR(p) && p && !*pos) + seq_puts(seqf, "major minor #blocks name\n\n"); + return p; +} + +static int show_partition(struct seq_file *seqf, void *v) { struct gendisk *sgp = v; - int n; + struct disk_part_iter piter; + struct hd_struct *part; char buf[BDEVNAME_SIZE]; - if (&sgp->dev.node == block_class.devices.next) - seq_puts(part, "major minor #blocks name\n\n"); - /* Don't show non-partitionable removeable devices or empty devices */ - if (!get_capacity(sgp) || - (sgp->minors == 1 && (sgp->flags & GENHD_FL_REMOVABLE))) + if (!get_capacity(sgp) || (!disk_partitionable(sgp) && + (sgp->flags & GENHD_FL_REMOVABLE))) return 0; if (sgp->flags & GENHD_FL_SUPPRESS_PARTITION_INFO) return 0; /* show the full disk and all non-0 size partitions of it */ - seq_printf(part, "%4d %4d %10llu %s\n", - sgp->major, sgp->first_minor, - (unsigned long long)get_capacity(sgp) >> 1, - disk_name(sgp, 0, buf)); - for (n = 0; n < sgp->minors - 1; n++) { - if (!sgp->part[n]) - continue; - if (sgp->part[n]->nr_sects == 0) - continue; - seq_printf(part, "%4d %4d %10llu %s\n", - sgp->major, n + 1 + sgp->first_minor, - (unsigned long long)sgp->part[n]->nr_sects >> 1 , - disk_name(sgp, n + 1, buf)); - } + disk_part_iter_init(&piter, sgp, DISK_PITER_INCL_PART0); + while ((part = disk_part_iter_next(&piter))) + seq_printf(seqf, "%4d %7d %10llu %s\n", + MAJOR(part_devt(part)), MINOR(part_devt(part)), + (unsigned long long)part->nr_sects >> 1, + disk_name(sgp, part->partno, buf)); + disk_part_iter_exit(&piter); return 0; } const struct seq_operations partitions_op = { - .start = part_start, - .next = part_next, - .stop = part_stop, + .start = show_partition_start, + .next = disk_seqf_next, + .stop = disk_seqf_stop, .show = show_partition }; #endif -static struct kobject *base_probe(dev_t devt, int *part, void *data) +static struct kobject *base_probe(dev_t devt, int *partno, void *data) { if (request_module("block-major-%d-%d", MAJOR(devt), MINOR(devt)) > 0) /* Make old-style 2.4 aliases work */ @@ -368,7 +747,10 @@ static struct kobject *base_probe(dev_t devt, int *part, void *data) static int __init genhd_device_init(void) { - int error = class_register(&block_class); + int error; + + block_class.dev_kobj = sysfs_dev_block_kobj; + error = class_register(&block_class); if (unlikely(error)) return error; bdev_map = kobj_map_init(base_probe, &block_class_lock); @@ -391,6 +773,14 @@ static ssize_t disk_range_show(struct device *dev, return sprintf(buf, "%d\n", disk->minors); } +static ssize_t disk_ext_range_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct gendisk *disk = dev_to_disk(dev); + + return sprintf(buf, "%d\n", disk_max_parts(disk)); +} + static ssize_t disk_removable_show(struct device *dev, struct device_attribute *attr, char *buf) { @@ -400,12 +790,12 @@ static ssize_t disk_removable_show(struct device *dev, (disk->flags & GENHD_FL_REMOVABLE ? 1 : 0)); } -static ssize_t disk_size_show(struct device *dev, - struct device_attribute *attr, char *buf) +static ssize_t disk_ro_show(struct device *dev, + struct device_attribute *attr, char *buf) { struct gendisk *disk = dev_to_disk(dev); - return sprintf(buf, "%llu\n", (unsigned long long)get_capacity(disk)); + return sprintf(buf, "%d\n", get_disk_ro(disk) ? 1 : 0); } static ssize_t disk_capability_show(struct device *dev, @@ -416,79 +806,37 @@ static ssize_t disk_capability_show(struct device *dev, return sprintf(buf, "%x\n", disk->flags); } -static ssize_t disk_stat_show(struct device *dev, - struct device_attribute *attr, char *buf) -{ - struct gendisk *disk = dev_to_disk(dev); - - preempt_disable(); - disk_round_stats(disk); - preempt_enable(); - return sprintf(buf, - "%8lu %8lu %8llu %8u " - "%8lu %8lu %8llu %8u " - "%8u %8u %8u" - "\n", - disk_stat_read(disk, ios[READ]), - disk_stat_read(disk, merges[READ]), - (unsigned long long)disk_stat_read(disk, sectors[READ]), - jiffies_to_msecs(disk_stat_read(disk, ticks[READ])), - disk_stat_read(disk, ios[WRITE]), - disk_stat_read(disk, merges[WRITE]), - (unsigned long long)disk_stat_read(disk, sectors[WRITE]), - jiffies_to_msecs(disk_stat_read(disk, ticks[WRITE])), - disk->in_flight, - jiffies_to_msecs(disk_stat_read(disk, io_ticks)), - jiffies_to_msecs(disk_stat_read(disk, time_in_queue))); -} - -#ifdef CONFIG_FAIL_MAKE_REQUEST -static ssize_t disk_fail_show(struct device *dev, - struct device_attribute *attr, char *buf) -{ - struct gendisk *disk = dev_to_disk(dev); - - return sprintf(buf, "%d\n", disk->flags & GENHD_FL_FAIL ? 1 : 0); -} - -static ssize_t disk_fail_store(struct device *dev, - struct device_attribute *attr, - const char *buf, size_t count) -{ - struct gendisk *disk = dev_to_disk(dev); - int i; - - if (count > 0 && sscanf(buf, "%d", &i) > 0) { - if (i == 0) - disk->flags &= ~GENHD_FL_FAIL; - else - disk->flags |= GENHD_FL_FAIL; - } - - return count; -} - -#endif - static DEVICE_ATTR(range, S_IRUGO, disk_range_show, NULL); +static DEVICE_ATTR(ext_range, S_IRUGO, disk_ext_range_show, NULL); static DEVICE_ATTR(removable, S_IRUGO, disk_removable_show, NULL); -static DEVICE_ATTR(size, S_IRUGO, disk_size_show, NULL); +static DEVICE_ATTR(ro, S_IRUGO, disk_ro_show, NULL); +static DEVICE_ATTR(size, S_IRUGO, part_size_show, NULL); static DEVICE_ATTR(capability, S_IRUGO, disk_capability_show, NULL); -static DEVICE_ATTR(stat, S_IRUGO, disk_stat_show, NULL); +static DEVICE_ATTR(stat, S_IRUGO, part_stat_show, NULL); #ifdef CONFIG_FAIL_MAKE_REQUEST static struct device_attribute dev_attr_fail = - __ATTR(make-it-fail, S_IRUGO|S_IWUSR, disk_fail_show, disk_fail_store); + __ATTR(make-it-fail, S_IRUGO|S_IWUSR, part_fail_show, part_fail_store); +#endif +#ifdef CONFIG_FAIL_IO_TIMEOUT +static struct device_attribute dev_attr_fail_timeout = + __ATTR(io-timeout-fail, S_IRUGO|S_IWUSR, part_timeout_show, + part_timeout_store); #endif static struct attribute *disk_attrs[] = { &dev_attr_range.attr, + &dev_attr_ext_range.attr, &dev_attr_removable.attr, + &dev_attr_ro.attr, &dev_attr_size.attr, &dev_attr_capability.attr, &dev_attr_stat.attr, #ifdef CONFIG_FAIL_MAKE_REQUEST &dev_attr_fail.attr, #endif +#ifdef CONFIG_FAIL_IO_TIMEOUT + &dev_attr_fail_timeout.attr, +#endif NULL }; @@ -501,13 +849,87 @@ static struct attribute_group *disk_attr_groups[] = { NULL }; +static void disk_free_ptbl_rcu_cb(struct rcu_head *head) +{ + struct disk_part_tbl *ptbl = + container_of(head, struct disk_part_tbl, rcu_head); + + kfree(ptbl); +} + +/** + * disk_replace_part_tbl - replace disk->part_tbl in RCU-safe way + * @disk: disk to replace part_tbl for + * @new_ptbl: new part_tbl to install + * + * Replace disk->part_tbl with @new_ptbl in RCU-safe way. The + * original ptbl is freed using RCU callback. + * + * LOCKING: + * Matching bd_mutx locked. + */ +static void disk_replace_part_tbl(struct gendisk *disk, + struct disk_part_tbl *new_ptbl) +{ + struct disk_part_tbl *old_ptbl = disk->part_tbl; + + rcu_assign_pointer(disk->part_tbl, new_ptbl); + if (old_ptbl) + call_rcu(&old_ptbl->rcu_head, disk_free_ptbl_rcu_cb); +} + +/** + * disk_expand_part_tbl - expand disk->part_tbl + * @disk: disk to expand part_tbl for + * @partno: expand such that this partno can fit in + * + * Expand disk->part_tbl such that @partno can fit in. disk->part_tbl + * uses RCU to allow unlocked dereferencing for stats and other stuff. + * + * LOCKING: + * Matching bd_mutex locked, might sleep. + * + * RETURNS: + * 0 on success, -errno on failure. + */ +int disk_expand_part_tbl(struct gendisk *disk, int partno) +{ + struct disk_part_tbl *old_ptbl = disk->part_tbl; + struct disk_part_tbl *new_ptbl; + int len = old_ptbl ? old_ptbl->len : 0; + int target = partno + 1; + size_t size; + int i; + + /* disk_max_parts() is zero during initialization, ignore if so */ + if (disk_max_parts(disk) && target > disk_max_parts(disk)) + return -EINVAL; + + if (target <= len) + return 0; + + size = sizeof(*new_ptbl) + target * sizeof(new_ptbl->part[0]); + new_ptbl = kzalloc_node(size, GFP_KERNEL, disk->node_id); + if (!new_ptbl) + return -ENOMEM; + + INIT_RCU_HEAD(&new_ptbl->rcu_head); + new_ptbl->len = target; + + for (i = 0; i < len; i++) + rcu_assign_pointer(new_ptbl->part[i], old_ptbl->part[i]); + + disk_replace_part_tbl(disk, new_ptbl); + return 0; +} + static void disk_release(struct device *dev) { struct gendisk *disk = dev_to_disk(dev); kfree(disk->random); - kfree(disk->part); - free_disk_stats(disk); + disk_replace_part_tbl(disk, NULL); + free_part_stats(&disk->part0); kfree(disk); } struct class block_class = { @@ -520,6 +942,7 @@ static struct device_type disk_type = { .release = disk_release, }; +#ifdef CONFIG_PROC_FS /* * aggregate disk stat collector. Uses the same stats that the sysfs * entries do, above, but makes them available through one seq_file. @@ -527,85 +950,31 @@ static struct device_type disk_type = { * The output looks suspiciously like /proc/partitions with a bunch of * extra fields. */ - -static void *diskstats_start(struct seq_file *part, loff_t *pos) -{ - loff_t k = *pos; - struct device *dev; - - mutex_lock(&block_class_lock); - list_for_each_entry(dev, &block_class.devices, node) { - if (dev->type != &disk_type) - continue; - if (!k--) - return dev_to_disk(dev); - } - return NULL; -} - -static void *diskstats_next(struct seq_file *part, void *v, loff_t *pos) -{ - struct gendisk *gp = v; - struct device *dev; - - ++*pos; - list_for_each_entry(dev, &gp->dev.node, node) { - if (&dev->node == &block_class.devices) - return NULL; - if (dev->type == &disk_type) - return dev_to_disk(dev); - } - return NULL; -} - -static void diskstats_stop(struct seq_file *part, void *v) -{ - mutex_unlock(&block_class_lock); -} - -static int diskstats_show(struct seq_file *s, void *v) +static int diskstats_show(struct seq_file *seqf, void *v) { struct gendisk *gp = v; + struct disk_part_iter piter; + struct hd_struct *hd; char buf[BDEVNAME_SIZE]; - int n = 0; + int cpu; /* - if (&gp->dev.kobj.entry == block_class.devices.next) - seq_puts(s, "major minor name" + if (&disk_to_dev(gp)->kobj.entry == block_class.devices.next) + seq_puts(seqf, "major minor name" " rio rmerge rsect ruse wio wmerge " "wsect wuse running use aveq" "\n\n"); */ - preempt_disable(); - disk_round_stats(gp); - preempt_enable(); - seq_printf(s, "%4d %4d %s %lu %lu %llu %u %lu %lu %llu %u %u %u %u\n", - gp->major, n + gp->first_minor, disk_name(gp, n, buf), - disk_stat_read(gp, ios[0]), disk_stat_read(gp, merges[0]), - (unsigned long long)disk_stat_read(gp, sectors[0]), - jiffies_to_msecs(disk_stat_read(gp, ticks[0])), - disk_stat_read(gp, ios[1]), disk_stat_read(gp, merges[1]), - (unsigned long long)disk_stat_read(gp, sectors[1]), - jiffies_to_msecs(disk_stat_read(gp, ticks[1])), - gp->in_flight, - jiffies_to_msecs(disk_stat_read(gp, io_ticks)), - jiffies_to_msecs(disk_stat_read(gp, time_in_queue))); - - /* now show all non-0 size partitions of it */ - for (n = 0; n < gp->minors - 1; n++) { - struct hd_struct *hd = gp->part[n]; - - if (!hd || !hd->nr_sects) - continue; - - preempt_disable(); - part_round_stats(hd); - preempt_enable(); - seq_printf(s, "%4d %4d %s %lu %lu %llu " + disk_part_iter_init(&piter, gp, DISK_PITER_INCL_PART0); + while ((hd = disk_part_iter_next(&piter))) { + cpu = part_stat_lock(); + part_round_stats(cpu, hd); + part_stat_unlock(); + seq_printf(seqf, "%4d %7d %s %lu %lu %llu " "%u %lu %lu %llu %u %u %u %u\n", - gp->major, n + gp->first_minor + 1, - disk_name(gp, n + 1, buf), + MAJOR(part_devt(hd)), MINOR(part_devt(hd)), + disk_name(gp, hd->partno, buf), part_stat_read(hd, ios[0]), part_stat_read(hd, merges[0]), (unsigned long long)part_stat_read(hd, sectors[0]), @@ -619,16 +988,18 @@ static int diskstats_show(struct seq_file *s, void *v) jiffies_to_msecs(part_stat_read(hd, time_in_queue)) ); } + disk_part_iter_exit(&piter); return 0; } const struct seq_operations diskstats_op = { - .start = diskstats_start, - .next = diskstats_next, - .stop = diskstats_stop, + .start = disk_seqf_start, + .next = disk_seqf_next, + .stop = disk_seqf_stop, .show = diskstats_show }; +#endif /* CONFIG_PROC_FS */ static void media_change_notify_thread(struct work_struct *work) { @@ -640,7 +1011,7 @@ static void media_change_notify_thread(struct work_struct *work) * set enviroment vars to indicate which event this is for * so that user space will know to go check the media status. */ - kobject_uevent_env(&gd->dev.kobj, KOBJ_CHANGE, envp); + kobject_uevent_env(&disk_to_dev(gd)->kobj, KOBJ_CHANGE, envp); put_device(gd->driverfs_dev); } @@ -653,26 +1024,29 @@ void genhd_media_change_notify(struct gendisk *disk) EXPORT_SYMBOL_GPL(genhd_media_change_notify); #endif /* 0 */ -dev_t blk_lookup_devt(const char *name, int part) +dev_t blk_lookup_devt(const char *name, int partno) { - struct device *dev; dev_t devt = MKDEV(0, 0); + struct class_dev_iter iter; + struct device *dev; - mutex_lock(&block_class_lock); - list_for_each_entry(dev, &block_class.devices, node) { - if (dev->type != &disk_type) + class_dev_iter_init(&iter, &block_class, NULL, &disk_type); + while ((dev = class_dev_iter_next(&iter))) { + struct gendisk *disk = dev_to_disk(dev); + struct hd_struct *part; + + if (strcmp(dev->bus_id, name)) continue; - if (strcmp(dev->bus_id, name) == 0) { - struct gendisk *disk = dev_to_disk(dev); - if (part < disk->minors) - devt = MKDEV(MAJOR(dev->devt), - MINOR(dev->devt) + part); + part = disk_get_part(disk, partno); + if (part) { + devt = part_devt(part); + disk_put_part(part); break; } + disk_put_part(part); } - mutex_unlock(&block_class_lock); - + class_dev_iter_exit(&iter); return devt; } EXPORT_SYMBOL(blk_lookup_devt); @@ -681,6 +1055,7 @@ struct gendisk *alloc_disk(int minors) { return alloc_disk_node(minors, -1); } +EXPORT_SYMBOL(alloc_disk); struct gendisk *alloc_disk_node(int minors, int node_id) { @@ -689,32 +1064,28 @@ struct gendisk *alloc_disk_node(int minors, int node_id) disk = kmalloc_node(sizeof(struct gendisk), GFP_KERNEL | __GFP_ZERO, node_id); if (disk) { - if (!init_disk_stats(disk)) { + if (!init_part_stats(&disk->part0)) { kfree(disk); return NULL; } - if (minors > 1) { - int size = (minors - 1) * sizeof(struct hd_struct *); - disk->part = kmalloc_node(size, - GFP_KERNEL | __GFP_ZERO, node_id); - if (!disk->part) { - free_disk_stats(disk); - kfree(disk); - return NULL; - } + if (disk_expand_part_tbl(disk, 0)) { + free_part_stats(&disk->part0); + kfree(disk); + return NULL; } + disk->part_tbl->part[0] = &disk->part0; + disk->minors = minors; rand_initialize_disk(disk); - disk->dev.class = &block_class; - disk->dev.type = &disk_type; - device_initialize(&disk->dev); + disk_to_dev(disk)->class = &block_class; + disk_to_dev(disk)->type = &disk_type; + device_initialize(disk_to_dev(disk)); INIT_WORK(&disk->async_notify, media_change_notify_thread); + disk->node_id = node_id; } return disk; } - -EXPORT_SYMBOL(alloc_disk); EXPORT_SYMBOL(alloc_disk_node); struct kobject *get_disk(struct gendisk *disk) @@ -727,7 +1098,7 @@ struct kobject *get_disk(struct gendisk *disk) owner = disk->fops->owner; if (owner && !try_module_get(owner)) return NULL; - kobj = kobject_get(&disk->dev.kobj); + kobj = kobject_get(&disk_to_dev(disk)->kobj); if (kobj == NULL) { module_put(owner); return NULL; @@ -741,27 +1112,28 @@ EXPORT_SYMBOL(get_disk); void put_disk(struct gendisk *disk) { if (disk) - kobject_put(&disk->dev.kobj); + kobject_put(&disk_to_dev(disk)->kobj); } EXPORT_SYMBOL(put_disk); void set_device_ro(struct block_device *bdev, int flag) { - if (bdev->bd_contains != bdev) - bdev->bd_part->policy = flag; - else - bdev->bd_disk->policy = flag; + bdev->bd_part->policy = flag; } EXPORT_SYMBOL(set_device_ro); void set_disk_ro(struct gendisk *disk, int flag) { - int i; - disk->policy = flag; - for (i = 0; i < disk->minors - 1; i++) - if (disk->part[i]) disk->part[i]->policy = flag; + struct disk_part_iter piter; + struct hd_struct *part; + + disk_part_iter_init(&piter, disk, + DISK_PITER_INCL_EMPTY | DISK_PITER_INCL_PART0); + while ((part = disk_part_iter_next(&piter))) + part->policy = flag; + disk_part_iter_exit(&piter); } EXPORT_SYMBOL(set_disk_ro); @@ -770,18 +1142,15 @@ int bdev_read_only(struct block_device *bdev) { if (!bdev) return 0; - else if (bdev->bd_contains != bdev) - return bdev->bd_part->policy; - else - return bdev->bd_disk->policy; + return bdev->bd_part->policy; } EXPORT_SYMBOL(bdev_read_only); -int invalidate_partition(struct gendisk *disk, int index) +int invalidate_partition(struct gendisk *disk, int partno) { int res = 0; - struct block_device *bdev = bdget_disk(disk, index); + struct block_device *bdev = bdget_disk(disk, partno); if (bdev) { fsync_bdev(bdev); res = __invalidate_device(bdev); diff --git a/block/ioctl.c b/block/ioctl.c index 52d6385216ad..38bee321e1fa 100644 --- a/block/ioctl.c +++ b/block/ioctl.c @@ -12,11 +12,13 @@ static int blkpg_ioctl(struct block_device *bdev, struct blkpg_ioctl_arg __user { struct block_device *bdevp; struct gendisk *disk; + struct hd_struct *part; struct blkpg_ioctl_arg a; struct blkpg_partition p; + struct disk_part_iter piter; long long start, length; - int part; - int i; + int partno; + int err; if (!capable(CAP_SYS_ADMIN)) return -EACCES; @@ -27,8 +29,8 @@ static int blkpg_ioctl(struct block_device *bdev, struct blkpg_ioctl_arg __user disk = bdev->bd_disk; if (bdev != bdev->bd_contains) return -EINVAL; - part = p.pno; - if (part <= 0 || part >= disk->minors) + partno = p.pno; + if (partno <= 0) return -EINVAL; switch (a.op) { case BLKPG_ADD_PARTITION: @@ -42,36 +44,37 @@ static int blkpg_ioctl(struct block_device *bdev, struct blkpg_ioctl_arg __user || pstart < 0 || plength < 0) return -EINVAL; } - /* partition number in use? */ + mutex_lock(&bdev->bd_mutex); - if (disk->part[part - 1]) { - mutex_unlock(&bdev->bd_mutex); - return -EBUSY; - } - /* overlap? */ - for (i = 0; i < disk->minors - 1; i++) { - struct hd_struct *s = disk->part[i]; - if (!s) - continue; - if (!(start+length <= s->start_sect || - start >= s->start_sect + s->nr_sects)) { + /* overlap? */ + disk_part_iter_init(&piter, disk, + DISK_PITER_INCL_EMPTY); + while ((part = disk_part_iter_next(&piter))) { + if (!(start + length <= part->start_sect || + start >= part->start_sect + part->nr_sects)) { + disk_part_iter_exit(&piter); mutex_unlock(&bdev->bd_mutex); return -EBUSY; } } + disk_part_iter_exit(&piter); + /* all seems OK */ - add_partition(disk, part, start, length, ADDPART_FLAG_NONE); + err = add_partition(disk, partno, start, length, + ADDPART_FLAG_NONE); mutex_unlock(&bdev->bd_mutex); - return 0; + return err; case BLKPG_DEL_PARTITION: - if (!disk->part[part-1]) - return -ENXIO; - if (disk->part[part - 1]->nr_sects == 0) + part = disk_get_part(disk, partno); + if (!part) return -ENXIO; - bdevp = bdget_disk(disk, part); + + bdevp = bdget(part_devt(part)); + disk_put_part(part); if (!bdevp) return -ENOMEM; + mutex_lock(&bdevp->bd_mutex); if (bdevp->bd_openers) { mutex_unlock(&bdevp->bd_mutex); @@ -83,7 +86,7 @@ static int blkpg_ioctl(struct block_device *bdev, struct blkpg_ioctl_arg __user invalidate_bdev(bdevp); mutex_lock_nested(&bdev->bd_mutex, 1); - delete_partition(disk, part); + delete_partition(disk, partno); mutex_unlock(&bdev->bd_mutex); mutex_unlock(&bdevp->bd_mutex); bdput(bdevp); @@ -99,7 +102,7 @@ static int blkdev_reread_part(struct block_device *bdev) struct gendisk *disk = bdev->bd_disk; int res; - if (disk->minors == 1 || bdev != bdev->bd_contains) + if (!disk_partitionable(disk) || bdev != bdev->bd_contains) return -EINVAL; if (!capable(CAP_SYS_ADMIN)) return -EACCES; @@ -110,6 +113,69 @@ static int blkdev_reread_part(struct block_device *bdev) return res; } +static void blk_ioc_discard_endio(struct bio *bio, int err) +{ + if (err) { + if (err == -EOPNOTSUPP) + set_bit(BIO_EOPNOTSUPP, &bio->bi_flags); + clear_bit(BIO_UPTODATE, &bio->bi_flags); + } + complete(bio->bi_private); +} + +static int blk_ioctl_discard(struct block_device *bdev, uint64_t start, + uint64_t len) +{ + struct request_queue *q = bdev_get_queue(bdev); + int ret = 0; + + if (start & 511) + return -EINVAL; + if (len & 511) + return -EINVAL; + start >>= 9; + len >>= 9; + + if (start + len > (bdev->bd_inode->i_size >> 9)) + return -EINVAL; + + if (!q->prepare_discard_fn) + return -EOPNOTSUPP; + + while (len && !ret) { + DECLARE_COMPLETION_ONSTACK(wait); + struct bio *bio; + + bio = bio_alloc(GFP_KERNEL, 0); + if (!bio) + return -ENOMEM; + + bio->bi_end_io = blk_ioc_discard_endio; + bio->bi_bdev = bdev; + bio->bi_private = &wait; + bio->bi_sector = start; + + if (len > q->max_hw_sectors) { + bio->bi_size = q->max_hw_sectors << 9; + len -= q->max_hw_sectors; + start += q->max_hw_sectors; + } else { + bio->bi_size = len << 9; + len = 0; + } + submit_bio(DISCARD_NOBARRIER, bio); + + wait_for_completion(&wait); + + if (bio_flagged(bio, BIO_EOPNOTSUPP)) + ret = -EOPNOTSUPP; + else if (!bio_flagged(bio, BIO_UPTODATE)) + ret = -EIO; + bio_put(bio); + } + return ret; +} + static int put_ushort(unsigned long arg, unsigned short val) { return put_user(val, (unsigned short __user *)arg); @@ -257,6 +323,19 @@ int blkdev_ioctl(struct inode *inode, struct file *file, unsigned cmd, set_device_ro(bdev, n); unlock_kernel(); return 0; + + case BLKDISCARD: { + uint64_t range[2]; + + if (!(file->f_mode & FMODE_WRITE)) + return -EBADF; + + if (copy_from_user(range, (void __user *)arg, sizeof(range))) + return -EFAULT; + + return blk_ioctl_discard(bdev, range[0], range[1]); + } + case HDIO_GETGEO: { struct hd_geometry geo; diff --git a/block/scsi_ioctl.c b/block/scsi_ioctl.c index 78199c08ec92..c34272a348fe 100644 --- a/block/scsi_ioctl.c +++ b/block/scsi_ioctl.c @@ -105,120 +105,97 @@ static int sg_emulated_host(struct request_queue *q, int __user *p) return put_user(1, p); } -#define CMD_READ_SAFE 0x01 -#define CMD_WRITE_SAFE 0x02 -#define CMD_WARNED 0x04 -#define safe_for_read(cmd) [cmd] = CMD_READ_SAFE -#define safe_for_write(cmd) [cmd] = CMD_WRITE_SAFE - -int blk_verify_command(unsigned char *cmd, int has_write_perm) +void blk_set_cmd_filter_defaults(struct blk_cmd_filter *filter) { - static unsigned char cmd_type[256] = { - - /* Basic read-only commands */ - safe_for_read(TEST_UNIT_READY), - safe_for_read(REQUEST_SENSE), - safe_for_read(READ_6), - safe_for_read(READ_10), - safe_for_read(READ_12), - safe_for_read(READ_16), - safe_for_read(READ_BUFFER), - safe_for_read(READ_DEFECT_DATA), - safe_for_read(READ_LONG), - safe_for_read(INQUIRY), - safe_for_read(MODE_SENSE), - safe_for_read(MODE_SENSE_10), - safe_for_read(LOG_SENSE), - safe_for_read(START_STOP), - safe_for_read(GPCMD_VERIFY_10), - safe_for_read(VERIFY_16), - - /* Audio CD commands */ - safe_for_read(GPCMD_PLAY_CD), - safe_for_read(GPCMD_PLAY_AUDIO_10), - safe_for_read(GPCMD_PLAY_AUDIO_MSF), - safe_for_read(GPCMD_PLAY_AUDIO_TI), - safe_for_read(GPCMD_PAUSE_RESUME), - - /* CD/DVD data reading */ - safe_for_read(GPCMD_READ_BUFFER_CAPACITY), - safe_for_read(GPCMD_READ_CD), - safe_for_read(GPCMD_READ_CD_MSF), - safe_for_read(GPCMD_READ_DISC_INFO), - safe_for_read(GPCMD_READ_CDVD_CAPACITY), - safe_for_read(GPCMD_READ_DVD_STRUCTURE), - safe_for_read(GPCMD_READ_HEADER), - safe_for_read(GPCMD_READ_TRACK_RZONE_INFO), - safe_for_read(GPCMD_READ_SUBCHANNEL), - safe_for_read(GPCMD_READ_TOC_PMA_ATIP), - safe_for_read(GPCMD_REPORT_KEY), - safe_for_read(GPCMD_SCAN), - safe_for_read(GPCMD_GET_CONFIGURATION), - safe_for_read(GPCMD_READ_FORMAT_CAPACITIES), - safe_for_read(GPCMD_GET_EVENT_STATUS_NOTIFICATION), - safe_for_read(GPCMD_GET_PERFORMANCE), - safe_for_read(GPCMD_SEEK), - safe_for_read(GPCMD_STOP_PLAY_SCAN), - - /* Basic writing commands */ - safe_for_write(WRITE_6), - safe_for_write(WRITE_10), - safe_for_write(WRITE_VERIFY), - safe_for_write(WRITE_12), - safe_for_write(WRITE_VERIFY_12), - safe_for_write(WRITE_16), - safe_for_write(WRITE_LONG), - safe_for_write(WRITE_LONG_2), - safe_for_write(ERASE), - safe_for_write(GPCMD_MODE_SELECT_10), - safe_for_write(MODE_SELECT), - safe_for_write(LOG_SELECT), - safe_for_write(GPCMD_BLANK), - safe_for_write(GPCMD_CLOSE_TRACK), - safe_for_write(GPCMD_FLUSH_CACHE), - safe_for_write(GPCMD_FORMAT_UNIT), - safe_for_write(GPCMD_REPAIR_RZONE_TRACK), - safe_for_write(GPCMD_RESERVE_RZONE_TRACK), - safe_for_write(GPCMD_SEND_DVD_STRUCTURE), - safe_for_write(GPCMD_SEND_EVENT), - safe_for_write(GPCMD_SEND_KEY), - safe_for_write(GPCMD_SEND_OPC), - safe_for_write(GPCMD_SEND_CUE_SHEET), - safe_for_write(GPCMD_SET_SPEED), - safe_for_write(GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL), - safe_for_write(GPCMD_LOAD_UNLOAD), - safe_for_write(GPCMD_SET_STREAMING), - }; - unsigned char type = cmd_type[cmd[0]]; - - /* Anybody who can open the device can do a read-safe command */ - if (type & CMD_READ_SAFE) - return 0; - - /* Write-safe commands just require a writable open.. */ - if ((type & CMD_WRITE_SAFE) && has_write_perm) - return 0; - - /* And root can do any command.. */ - if (capable(CAP_SYS_RAWIO)) - return 0; - - if (!type) { - cmd_type[cmd[0]] = CMD_WARNED; - printk(KERN_WARNING "scsi: unknown opcode 0x%02x\n", cmd[0]); - } - - /* Otherwise fail it with an "Operation not permitted" */ - return -EPERM; + /* Basic read-only commands */ + __set_bit(TEST_UNIT_READY, filter->read_ok); + __set_bit(REQUEST_SENSE, filter->read_ok); + __set_bit(READ_6, filter->read_ok); + __set_bit(READ_10, filter->read_ok); + __set_bit(READ_12, filter->read_ok); + __set_bit(READ_16, filter->read_ok); + __set_bit(READ_BUFFER, filter->read_ok); + __set_bit(READ_DEFECT_DATA, filter->read_ok); + __set_bit(READ_CAPACITY, filter->read_ok); + __set_bit(READ_LONG, filter->read_ok); + __set_bit(INQUIRY, filter->read_ok); + __set_bit(MODE_SENSE, filter->read_ok); + __set_bit(MODE_SENSE_10, filter->read_ok); + __set_bit(LOG_SENSE, filter->read_ok); + __set_bit(START_STOP, filter->read_ok); + __set_bit(GPCMD_VERIFY_10, filter->read_ok); + __set_bit(VERIFY_16, filter->read_ok); + __set_bit(REPORT_LUNS, filter->read_ok); + __set_bit(SERVICE_ACTION_IN, filter->read_ok); + __set_bit(RECEIVE_DIAGNOSTIC, filter->read_ok); + __set_bit(MAINTENANCE_IN, filter->read_ok); + __set_bit(GPCMD_READ_BUFFER_CAPACITY, filter->read_ok); + + /* Audio CD commands */ + __set_bit(GPCMD_PLAY_CD, filter->read_ok); + __set_bit(GPCMD_PLAY_AUDIO_10, filter->read_ok); + __set_bit(GPCMD_PLAY_AUDIO_MSF, filter->read_ok); + __set_bit(GPCMD_PLAY_AUDIO_TI, filter->read_ok); + __set_bit(GPCMD_PAUSE_RESUME, filter->read_ok); + + /* CD/DVD data reading */ + __set_bit(GPCMD_READ_CD, filter->read_ok); + __set_bit(GPCMD_READ_CD_MSF, filter->read_ok); + __set_bit(GPCMD_READ_DISC_INFO, filter->read_ok); + __set_bit(GPCMD_READ_CDVD_CAPACITY, filter->read_ok); + __set_bit(GPCMD_READ_DVD_STRUCTURE, filter->read_ok); + __set_bit(GPCMD_READ_HEADER, filter->read_ok); + __set_bit(GPCMD_READ_TRACK_RZONE_INFO, filter->read_ok); + __set_bit(GPCMD_READ_SUBCHANNEL, filter->read_ok); + __set_bit(GPCMD_READ_TOC_PMA_ATIP, filter->read_ok); + __set_bit(GPCMD_REPORT_KEY, filter->read_ok); + __set_bit(GPCMD_SCAN, filter->read_ok); + __set_bit(GPCMD_GET_CONFIGURATION, filter->read_ok); + __set_bit(GPCMD_READ_FORMAT_CAPACITIES, filter->read_ok); + __set_bit(GPCMD_GET_EVENT_STATUS_NOTIFICATION, filter->read_ok); + __set_bit(GPCMD_GET_PERFORMANCE, filter->read_ok); + __set_bit(GPCMD_SEEK, filter->read_ok); + __set_bit(GPCMD_STOP_PLAY_SCAN, filter->read_ok); + + /* Basic writing commands */ + __set_bit(WRITE_6, filter->write_ok); + __set_bit(WRITE_10, filter->write_ok); + __set_bit(WRITE_VERIFY, filter->write_ok); + __set_bit(WRITE_12, filter->write_ok); + __set_bit(WRITE_VERIFY_12, filter->write_ok); + __set_bit(WRITE_16, filter->write_ok); + __set_bit(WRITE_LONG, filter->write_ok); + __set_bit(WRITE_LONG_2, filter->write_ok); + __set_bit(ERASE, filter->write_ok); + __set_bit(GPCMD_MODE_SELECT_10, filter->write_ok); + __set_bit(MODE_SELECT, filter->write_ok); + __set_bit(LOG_SELECT, filter->write_ok); + __set_bit(GPCMD_BLANK, filter->write_ok); + __set_bit(GPCMD_CLOSE_TRACK, filter->write_ok); + __set_bit(GPCMD_FLUSH_CACHE, filter->write_ok); + __set_bit(GPCMD_FORMAT_UNIT, filter->write_ok); + __set_bit(GPCMD_REPAIR_RZONE_TRACK, filter->write_ok); + __set_bit(GPCMD_RESERVE_RZONE_TRACK, filter->write_ok); + __set_bit(GPCMD_SEND_DVD_STRUCTURE, filter->write_ok); + __set_bit(GPCMD_SEND_EVENT, filter->write_ok); + __set_bit(GPCMD_SEND_KEY, filter->write_ok); + __set_bit(GPCMD_SEND_OPC, filter->write_ok); + __set_bit(GPCMD_SEND_CUE_SHEET, filter->write_ok); + __set_bit(GPCMD_SET_SPEED, filter->write_ok); + __set_bit(GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL, filter->write_ok); + __set_bit(GPCMD_LOAD_UNLOAD, filter->write_ok); + __set_bit(GPCMD_SET_STREAMING, filter->write_ok); + __set_bit(GPCMD_SET_READ_AHEAD, filter->write_ok); } -EXPORT_SYMBOL_GPL(blk_verify_command); +EXPORT_SYMBOL_GPL(blk_set_cmd_filter_defaults); static int blk_fill_sghdr_rq(struct request_queue *q, struct request *rq, - struct sg_io_hdr *hdr, int has_write_perm) + struct sg_io_hdr *hdr, struct file *file) { if (copy_from_user(rq->cmd, hdr->cmdp, hdr->cmd_len)) return -EFAULT; - if (blk_verify_command(rq->cmd, has_write_perm)) + if (blk_verify_command(&q->cmd_filter, rq->cmd, + file->f_mode & FMODE_WRITE)) return -EPERM; /* @@ -287,7 +264,7 @@ static int sg_io(struct file *file, struct request_queue *q, struct gendisk *bd_disk, struct sg_io_hdr *hdr) { unsigned long start_time; - int writing = 0, ret = 0, has_write_perm = 0; + int writing = 0, ret = 0; struct request *rq; char sense[SCSI_SENSE_BUFFERSIZE]; struct bio *bio; @@ -316,10 +293,7 @@ static int sg_io(struct file *file, struct request_queue *q, if (!rq) return -ENOMEM; - if (file) - has_write_perm = file->f_mode & FMODE_WRITE; - - if (blk_fill_sghdr_rq(q, rq, hdr, has_write_perm)) { + if (blk_fill_sghdr_rq(q, rq, hdr, file)) { blk_put_request(rq); return -EFAULT; } @@ -340,11 +314,12 @@ static int sg_io(struct file *file, struct request_queue *q, goto out; } - ret = blk_rq_map_user_iov(q, rq, iov, hdr->iovec_count, - hdr->dxfer_len); + ret = blk_rq_map_user_iov(q, rq, NULL, iov, hdr->iovec_count, + hdr->dxfer_len, GFP_KERNEL); kfree(iov); } else if (hdr->dxfer_len) - ret = blk_rq_map_user(q, rq, hdr->dxferp, hdr->dxfer_len); + ret = blk_rq_map_user(q, rq, NULL, hdr->dxferp, hdr->dxfer_len, + GFP_KERNEL); if (ret) goto out; @@ -409,7 +384,7 @@ int sg_scsi_ioctl(struct file *file, struct request_queue *q, struct gendisk *disk, struct scsi_ioctl_command __user *sic) { struct request *rq; - int err; + int err, write_perm = 0; unsigned int in_len, out_len, bytes, opcode, cmdlen; char *buffer = NULL, sense[SCSI_SENSE_BUFFERSIZE]; @@ -451,7 +426,11 @@ int sg_scsi_ioctl(struct file *file, struct request_queue *q, if (in_len && copy_from_user(buffer, sic->data + cmdlen, in_len)) goto error; - err = blk_verify_command(rq->cmd, file->f_mode & FMODE_WRITE); + /* scsi_ioctl passes NULL */ + if (file && (file->f_mode & FMODE_WRITE)) + write_perm = 1; + + err = blk_verify_command(&q->cmd_filter, rq->cmd, write_perm); if (err) goto error; @@ -629,7 +608,7 @@ int scsi_cmd_ioctl(struct file *file, struct request_queue *q, hdr.sbp = cgc.sense; if (hdr.sbp) hdr.mx_sb_len = sizeof(struct request_sense); - hdr.timeout = cgc.timeout; + hdr.timeout = jiffies_to_msecs(cgc.timeout); hdr.cmdp = ((struct cdrom_generic_command __user*) arg)->cmd; hdr.cmd_len = sizeof(cgc.cmd); |
