diff options
Diffstat (limited to 'block')
-rw-r--r-- | block/Kconfig | 5 | ||||
-rw-r--r-- | block/Makefile | 5 | ||||
-rw-r--r-- | block/bio.c | 10 | ||||
-rw-r--r-- | block/blk-cgroup.c | 10 | ||||
-rw-r--r-- | block/blk-core.c | 325 | ||||
-rw-r--r-- | block/blk-exec.c | 19 | ||||
-rw-r--r-- | block/blk-flush.c | 14 | ||||
-rw-r--r-- | block/blk-integrity.c | 4 | ||||
-rw-r--r-- | block/blk-ioc.c | 22 | ||||
-rw-r--r-- | block/blk-map.c | 13 | ||||
-rw-r--r-- | block/blk-merge.c | 58 | ||||
-rw-r--r-- | block/blk-mq-debugfs.c | 88 | ||||
-rw-r--r-- | block/blk-mq-sched.c | 86 | ||||
-rw-r--r-- | block/blk-mq-sched.h | 9 | ||||
-rw-r--r-- | block/blk-mq-sysfs.c | 2 | ||||
-rw-r--r-- | block/blk-mq.c | 73 | ||||
-rw-r--r-- | block/blk-mq.h | 5 | ||||
-rw-r--r-- | block/blk-settings.c | 22 | ||||
-rw-r--r-- | block/blk-sysfs.c | 68 | ||||
-rw-r--r-- | block/blk-wbt.c | 8 | ||||
-rw-r--r-- | block/blk.h | 21 | ||||
-rw-r--r-- | block/bsg-lib.c | 49 | ||||
-rw-r--r-- | block/bsg.c | 64 | ||||
-rw-r--r-- | block/cfq-iosched.c | 4 | ||||
-rw-r--r-- | block/compat_ioctl.c | 7 | ||||
-rw-r--r-- | block/deadline-iosched.c | 12 | ||||
-rw-r--r-- | block/elevator.c | 16 | ||||
-rw-r--r-- | block/genhd.c | 25 | ||||
-rw-r--r-- | block/ioctl.c | 7 | ||||
-rw-r--r-- | block/mq-deadline.c | 15 | ||||
-rw-r--r-- | block/scsi_ioctl.c | 83 |
31 files changed, 640 insertions, 509 deletions
diff --git a/block/Kconfig b/block/Kconfig index 1aef809affae..a2a92e57a87d 100644 --- a/block/Kconfig +++ b/block/Kconfig @@ -49,9 +49,13 @@ config LBDAF If unsure, say Y. +config BLK_SCSI_REQUEST + bool + config BLK_DEV_BSG bool "Block layer SG support v4" default y + select BLK_SCSI_REQUEST help Saying Y here will enable generic SG (SCSI generic) v4 support for any block device. @@ -71,6 +75,7 @@ config BLK_DEV_BSGLIB bool "Block layer SG support v4 helper lib" default n select BLK_DEV_BSG + select BLK_SCSI_REQUEST help Subsystems will normally enable this if needed. Users will not normally need to manually enable this. diff --git a/block/Makefile b/block/Makefile index 6ba1b1bc9529..2ad7c304e3f5 100644 --- a/block/Makefile +++ b/block/Makefile @@ -7,10 +7,11 @@ obj-$(CONFIG_BLOCK) := bio.o elevator.o blk-core.o blk-tag.o blk-sysfs.o \ blk-exec.o blk-merge.o blk-softirq.o blk-timeout.o \ blk-lib.o blk-mq.o blk-mq-tag.o blk-stat.o \ blk-mq-sysfs.o blk-mq-cpumap.o blk-mq-sched.o ioctl.o \ - genhd.o scsi_ioctl.o partition-generic.o ioprio.o \ + genhd.o partition-generic.o ioprio.o \ badblocks.o partitions/ -obj-$(CONFIG_BOUNCE) += bounce.o +obj-$(CONFIG_BOUNCE) += bounce.o +obj-$(CONFIG_BLK_SCSI_REQUEST) += scsi_ioctl.o obj-$(CONFIG_BLK_DEV_BSG) += bsg.o obj-$(CONFIG_BLK_DEV_BSGLIB) += bsg-lib.o obj-$(CONFIG_BLK_CGROUP) += blk-cgroup.o diff --git a/block/bio.c b/block/bio.c index d3c26d1cb1da..4b564d0c3e29 100644 --- a/block/bio.c +++ b/block/bio.c @@ -1227,9 +1227,6 @@ struct bio *bio_copy_user_iov(struct request_queue *q, if (!bio) goto out_bmd; - if (iter->type & WRITE) - bio_set_op_attrs(bio, REQ_OP_WRITE, 0); - ret = 0; if (map_data) { @@ -1394,12 +1391,6 @@ struct bio *bio_map_user_iov(struct request_queue *q, kfree(pages); - /* - * set data direction, and check if mapped pages need bouncing - */ - if (iter->type & WRITE) - bio_set_op_attrs(bio, REQ_OP_WRITE, 0); - bio_set_flag(bio, BIO_USER_MAPPED); /* @@ -1590,7 +1581,6 @@ struct bio *bio_copy_kern(struct request_queue *q, void *data, unsigned int len, bio->bi_private = data; } else { bio->bi_end_io = bio_copy_kern_endio; - bio_set_op_attrs(bio, REQ_OP_WRITE, 0); } return bio; diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c index fb59a3edc778..295e98c2c8cc 100644 --- a/block/blk-cgroup.c +++ b/block/blk-cgroup.c @@ -184,7 +184,7 @@ static struct blkcg_gq *blkg_create(struct blkcg *blkcg, goto err_free_blkg; } - wb_congested = wb_congested_get_create(&q->backing_dev_info, + wb_congested = wb_congested_get_create(q->backing_dev_info, blkcg->css.id, GFP_NOWAIT | __GFP_NOWARN); if (!wb_congested) { @@ -469,8 +469,8 @@ static int blkcg_reset_stats(struct cgroup_subsys_state *css, const char *blkg_dev_name(struct blkcg_gq *blkg) { /* some drivers (floppy) instantiate a queue w/o disk registered */ - if (blkg->q->backing_dev_info.dev) - return dev_name(blkg->q->backing_dev_info.dev); + if (blkg->q->backing_dev_info->dev) + return dev_name(blkg->q->backing_dev_info->dev); return NULL; } EXPORT_SYMBOL_GPL(blkg_dev_name); @@ -1079,10 +1079,8 @@ int blkcg_init_queue(struct request_queue *q) if (preloaded) radix_tree_preload_end(); - if (IS_ERR(blkg)) { - blkg_free(new_blkg); + if (IS_ERR(blkg)) return PTR_ERR(blkg); - } q->root_blkg = blkg; q->root_rl.blkg = blkg; diff --git a/block/blk-core.c b/block/blk-core.c index b2df55a65250..b9e857f4afe8 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -33,6 +33,7 @@ #include <linux/ratelimit.h> #include <linux/pm_runtime.h> #include <linux/blk-cgroup.h> +#include <linux/debugfs.h> #define CREATE_TRACE_POINTS #include <trace/events/block.h> @@ -42,6 +43,10 @@ #include "blk-mq-sched.h" #include "blk-wbt.h" +#ifdef CONFIG_DEBUG_FS +struct dentry *blk_debugfs_root; +#endif + EXPORT_TRACEPOINT_SYMBOL_GPL(block_bio_remap); EXPORT_TRACEPOINT_SYMBOL_GPL(block_rq_remap); EXPORT_TRACEPOINT_SYMBOL_GPL(block_bio_complete); @@ -75,7 +80,7 @@ static void blk_clear_congested(struct request_list *rl, int sync) * flip its congestion state for events on other blkcgs. */ if (rl == &rl->q->root_rl) - clear_wb_congested(rl->q->backing_dev_info.wb.congested, sync); + clear_wb_congested(rl->q->backing_dev_info->wb.congested, sync); #endif } @@ -86,7 +91,7 @@ static void blk_set_congested(struct request_list *rl, int sync) #else /* see blk_clear_congested() */ if (rl == &rl->q->root_rl) - set_wb_congested(rl->q->backing_dev_info.wb.congested, sync); + set_wb_congested(rl->q->backing_dev_info->wb.congested, sync); #endif } @@ -105,22 +110,6 @@ void blk_queue_congestion_threshold(struct request_queue *q) q->nr_congestion_off = nr; } -/** - * blk_get_backing_dev_info - get the address of a queue's backing_dev_info - * @bdev: device - * - * Locates the passed device's request queue and returns the address of its - * backing_dev_info. This function can only be called if @bdev is opened - * and the return value is never NULL. - */ -struct backing_dev_info *blk_get_backing_dev_info(struct block_device *bdev) -{ - struct request_queue *q = bdev_get_queue(bdev); - - return &q->backing_dev_info; -} -EXPORT_SYMBOL(blk_get_backing_dev_info); - void blk_rq_init(struct request_queue *q, struct request *rq) { memset(rq, 0, sizeof(*rq)); @@ -132,8 +121,6 @@ void blk_rq_init(struct request_queue *q, struct request *rq) rq->__sector = (sector_t) -1; INIT_HLIST_NODE(&rq->hash); RB_CLEAR_NODE(&rq->rb_node); - rq->cmd = rq->__cmd; - rq->cmd_len = BLK_MAX_CDB; rq->tag = -1; rq->internal_tag = -1; rq->start_time = jiffies; @@ -160,10 +147,8 @@ static void req_bio_endio(struct request *rq, struct bio *bio, void blk_dump_rq_flags(struct request *rq, char *msg) { - int bit; - - printk(KERN_INFO "%s: dev %s: type=%x, flags=%llx\n", msg, - rq->rq_disk ? rq->rq_disk->disk_name : "?", rq->cmd_type, + printk(KERN_INFO "%s: dev %s: flags=%llx\n", msg, + rq->rq_disk ? rq->rq_disk->disk_name : "?", (unsigned long long) rq->cmd_flags); printk(KERN_INFO " sector %llu, nr/cnr %u/%u\n", @@ -171,13 +156,6 @@ void blk_dump_rq_flags(struct request *rq, char *msg) blk_rq_sectors(rq), blk_rq_cur_sectors(rq)); printk(KERN_INFO " bio %p, biotail %p, len %u\n", rq->bio, rq->biotail, blk_rq_bytes(rq)); - - if (rq->cmd_type == REQ_TYPE_BLOCK_PC) { - printk(KERN_INFO " cdb: "); - for (bit = 0; bit < BLK_MAX_CDB; bit++) - printk("%02x ", rq->cmd[bit]); - printk("\n"); - } } EXPORT_SYMBOL(blk_dump_rq_flags); @@ -588,7 +566,7 @@ void blk_cleanup_queue(struct request_queue *q) blk_flush_integrity(); /* @q won't process any more request, flush async actions */ - del_timer_sync(&q->backing_dev_info.laptop_mode_wb_timer); + del_timer_sync(&q->backing_dev_info->laptop_mode_wb_timer); blk_sync_queue(q); if (q->mq_ops) @@ -600,7 +578,8 @@ void blk_cleanup_queue(struct request_queue *q) q->queue_lock = &q->__queue_lock; spin_unlock_irq(lock); - bdi_unregister(&q->backing_dev_info); + bdi_unregister(q->backing_dev_info); + put_disk_devt(q->disk_devt); /* @q is and will stay empty, shutdown and put */ blk_put_queue(q); @@ -608,17 +587,41 @@ void blk_cleanup_queue(struct request_queue *q) EXPORT_SYMBOL(blk_cleanup_queue); /* Allocate memory local to the request queue */ -static void *alloc_request_struct(gfp_t gfp_mask, void *data) +static void *alloc_request_simple(gfp_t gfp_mask, void *data) { - int nid = (int)(long)data; - return kmem_cache_alloc_node(request_cachep, gfp_mask, nid); + struct request_queue *q = data; + + return kmem_cache_alloc_node(request_cachep, gfp_mask, q->node); } -static void free_request_struct(void *element, void *unused) +static void free_request_simple(void *element, void *data) { kmem_cache_free(request_cachep, element); } +static void *alloc_request_size(gfp_t gfp_mask, void *data) +{ + struct request_queue *q = data; + struct request *rq; + + rq = kmalloc_node(sizeof(struct request) + q->cmd_size, gfp_mask, + q->node); + if (rq && q->init_rq_fn && q->init_rq_fn(q, rq, gfp_mask) < 0) { + kfree(rq); + rq = NULL; + } + return rq; +} + +static void free_request_size(void *element, void *data) +{ + struct request_queue *q = data; + + if (q->exit_rq_fn) + q->exit_rq_fn(q, element); + kfree(element); +} + int blk_init_rl(struct request_list *rl, struct request_queue *q, gfp_t gfp_mask) { @@ -631,10 +634,15 @@ int blk_init_rl(struct request_list *rl, struct request_queue *q, init_waitqueue_head(&rl->wait[BLK_RW_SYNC]); init_waitqueue_head(&rl->wait[BLK_RW_ASYNC]); - rl->rq_pool = mempool_create_node(BLKDEV_MIN_RQ, alloc_request_struct, - free_request_struct, - (void *)(long)q->node, gfp_mask, - q->node); + if (q->cmd_size) { + rl->rq_pool = mempool_create_node(BLKDEV_MIN_RQ, + alloc_request_size, free_request_size, + q, gfp_mask, q->node); + } else { + rl->rq_pool = mempool_create_node(BLKDEV_MIN_RQ, + alloc_request_simple, free_request_simple, + q, gfp_mask, q->node); + } if (!rl->rq_pool) return -ENOMEM; @@ -697,7 +705,6 @@ static void blk_rq_timed_out_timer(unsigned long data) struct request_queue *blk_alloc_queue_node(gfp_t gfp_mask, int node_id) { struct request_queue *q; - int err; q = kmem_cache_alloc_node(blk_requestq_cachep, gfp_mask | __GFP_ZERO, node_id); @@ -712,17 +719,17 @@ struct request_queue *blk_alloc_queue_node(gfp_t gfp_mask, int node_id) if (!q->bio_split) goto fail_id; - q->backing_dev_info.ra_pages = + q->backing_dev_info = bdi_alloc_node(gfp_mask, node_id); + if (!q->backing_dev_info) + goto fail_split; + + q->backing_dev_info->ra_pages = (VM_MAX_READAHEAD * 1024) / PAGE_SIZE; - q->backing_dev_info.capabilities = BDI_CAP_CGROUP_WRITEBACK; - q->backing_dev_info.name = "block"; + q->backing_dev_info->capabilities = BDI_CAP_CGROUP_WRITEBACK; + q->backing_dev_info->name = "block"; q->node = node_id; - err = bdi_init(&q->backing_dev_info); - if (err) - goto fail_split; - - setup_timer(&q->backing_dev_info.laptop_mode_wb_timer, + setup_timer(&q->backing_dev_info->laptop_mode_wb_timer, laptop_mode_timer_fn, (unsigned long) q); setup_timer(&q->timeout, blk_rq_timed_out_timer, (unsigned long) q); INIT_LIST_HEAD(&q->queue_head); @@ -772,7 +779,7 @@ struct request_queue *blk_alloc_queue_node(gfp_t gfp_mask, int node_id) fail_ref: percpu_ref_exit(&q->q_usage_counter); fail_bdi: - bdi_destroy(&q->backing_dev_info); + bdi_put(q->backing_dev_info); fail_split: bioset_free(q->bio_split); fail_id: @@ -825,15 +832,19 @@ EXPORT_SYMBOL(blk_init_queue); struct request_queue * blk_init_queue_node(request_fn_proc *rfn, spinlock_t *lock, int node_id) { - struct request_queue *uninit_q, *q; + struct request_queue *q; - uninit_q = blk_alloc_queue_node(GFP_KERNEL, node_id); - if (!uninit_q) + q = blk_alloc_queue_node(GFP_KERNEL, node_id); + if (!q) return NULL; - q = blk_init_allocated_queue(uninit_q, rfn, lock); - if (!q) - blk_cleanup_queue(uninit_q); + q->request_fn = rfn; + if (lock) + q->queue_lock = lock; + if (blk_init_allocated_queue(q) < 0) { + blk_cleanup_queue(q); + return NULL; + } return q; } @@ -841,30 +852,22 @@ EXPORT_SYMBOL(blk_init_queue_node); static blk_qc_t blk_queue_bio(struct request_queue *q, struct bio *bio); -struct request_queue * -blk_init_allocated_queue(struct request_queue *q, request_fn_proc *rfn, - spinlock_t *lock) -{ - if (!q) - return NULL; - q->fq = blk_alloc_flush_queue(q, NUMA_NO_NODE, 0); +int blk_init_allocated_queue(struct request_queue *q) +{ + q->fq = blk_alloc_flush_queue(q, NUMA_NO_NODE, q->cmd_size); if (!q->fq) - return NULL; + return -ENOMEM; + + if (q->init_rq_fn && q->init_rq_fn(q, q->fq->flush_rq, GFP_KERNEL)) + goto out_free_flush_queue; if (blk_init_rl(&q->root_rl, q, GFP_KERNEL)) - goto fail; + goto out_exit_flush_rq; INIT_WORK(&q->timeout_work, blk_timeout_work); - q->request_fn = rfn; - q->prep_rq_fn = NULL; - q->unprep_rq_fn = NULL; q->queue_flags |= QUEUE_FLAG_DEFAULT; - /* Override internal queue lock with supplied lock pointer */ - if (lock) - q->queue_lock = lock; - /* * This also sets hw/phys segments, boundary and size */ @@ -878,17 +881,19 @@ blk_init_allocated_queue(struct request_queue *q, request_fn_proc *rfn, /* init elevator */ if (elevator_init(q, NULL)) { mutex_unlock(&q->sysfs_lock); - goto fail; + goto out_exit_flush_rq; } mutex_unlock(&q->sysfs_lock); + return 0; - return q; - -fail: +out_exit_flush_rq: + if (q->exit_rq_fn) + q->exit_rq_fn(q, q->fq->flush_rq); +out_free_flush_queue: blk_free_flush_queue(q->fq); wbt_exit(q); - return NULL; + return -ENOMEM; } EXPORT_SYMBOL(blk_init_allocated_queue); @@ -1024,25 +1029,6 @@ int blk_update_nr_requests(struct request_queue *q, unsigned int nr) return 0; } -/* - * Determine if elevator data should be initialized when allocating the - * request associated with @bio. - */ -static bool blk_rq_should_init_elevator(struct bio *bio) -{ - if (!bio) - return true; - - /* - * Flush requests do not use the elevator so skip initialization. - * This allows a request to share the flush and elevator data. - */ - if (op_is_flush(bio->bi_opf)) - return false; - - return true; -} - /** * __get_request - get a free request * @rl: request list to allocate from @@ -1121,10 +1107,13 @@ static struct request *__get_request(struct request_list *rl, unsigned int op, * request is freed. This guarantees icq's won't be destroyed and * makes creating new ones safe. * + * Flush requests do not use the elevator so skip initialization. + * This allows a request to share the flush and elevator data. + * * Also, lookup icq while holding queue_lock. If it doesn't exist, * it will be created after releasing queue_lock. */ - if (blk_rq_should_init_elevator(bio) && !blk_queue_bypass(q)) { + if (!op_is_flush(op) && !blk_queue_bypass(q)) { rq_flags |= RQF_ELVPRIV; q->nr_rqs_elvpriv++; if (et->icq_cache && ioc) @@ -1184,7 +1173,7 @@ fail_elvpriv: * disturb iosched and blkcg but weird is bettern than dead. */ printk_ratelimited(KERN_WARNING "%s: dev %s: request aux data allocation failed, iosched may be disturbed\n", - __func__, dev_name(q->backing_dev_info.dev)); + __func__, dev_name(q->backing_dev_info->dev)); rq->rq_flags &= ~RQF_ELVPRIV; rq->elv.icq = NULL; @@ -1278,8 +1267,6 @@ static struct request *blk_old_get_request(struct request_queue *q, int rw, { struct request *rq; - BUG_ON(rw != READ && rw != WRITE); - /* create ioc upfront */ create_io_context(gfp_mask, q->node); @@ -1309,18 +1296,6 @@ struct request *blk_get_request(struct request_queue *q, int rw, gfp_t gfp_mask) EXPORT_SYMBOL(blk_get_request); /** - * blk_rq_set_block_pc - initialize a request to type BLOCK_PC - * @rq: request to be initialized - * - */ -void blk_rq_set_block_pc(struct request *rq) -{ - rq->cmd_type = REQ_TYPE_BLOCK_PC; - memset(rq->__cmd, 0, sizeof(rq->__cmd)); -} -EXPORT_SYMBOL(blk_rq_set_block_pc); - -/** * blk_requeue_request - put a request back on queue * @q: request queue where request should be inserted * @rq: request to be inserted @@ -1510,6 +1485,30 @@ bool bio_attempt_front_merge(struct request_queue *q, struct request *req, return true; } +bool bio_attempt_discard_merge(struct request_queue *q, struct request *req, + struct bio *bio) +{ + unsigned short segments = blk_rq_nr_discard_segments(req); + + if (segments >= queue_max_discard_segments(q)) + goto no_merge; + if (blk_rq_sectors(req) + bio_sectors(bio) > + blk_rq_get_max_sectors(req, blk_rq_pos(req))) + goto no_merge; + + req->biotail->bi_next = bio; + req->biotail = bio; + req->__data_len += bio->bi_iter.bi_size; + req->ioprio = ioprio_best(req->ioprio, bio_prio(bio)); + req->nr_phys_segments = segments + 1; + + blk_account_io_start(req, false); + return true; +no_merge: + req_set_nomerge(q, req); + return false; +} + /** * blk_attempt_plug_merge - try to merge with %current's plugged list * @q: request_queue new bio is being queued at @@ -1538,12 +1537,11 @@ bool blk_attempt_plug_merge(struct request_queue *q, struct bio *bio, { struct blk_plug *plug; struct request *rq; - bool ret = false; struct list_head *plug_list; plug = current->plug; if (!plug) - goto out; + return false; *request_count = 0; if (q->mq_ops) @@ -1552,7 +1550,7 @@ bool blk_attempt_plug_merge(struct request_queue *q, struct bio *bio, plug_list = &plug->list; list_for_each_entry_reverse(rq, plug_list, queuelist) { - int el_ret; + bool merged = false; if (rq->q == q) { (*request_count)++; @@ -1568,19 +1566,25 @@ bool blk_attempt_plug_merge(struct request_queue *q, struct bio *bio, if (rq->q != q || !blk_rq_merge_ok(rq, bio)) continue; - el_ret = blk_try_merge(rq, bio); - if (el_ret == ELEVATOR_BACK_MERGE) { - ret = bio_attempt_back_merge(q, rq, bio); - if (ret) - break; - } else if (el_ret == ELEVATOR_FRONT_MERGE) { - ret = bio_attempt_front_merge(q, rq, bio); - if (ret) - break; + switch (blk_try_merge(rq, bio)) { + case ELEVATOR_BACK_MERGE: + merged = bio_attempt_back_merge(q, rq, bio); + break; + case ELEVATOR_FRONT_MERGE: + merged = bio_attempt_front_merge(q, rq, bio); + break; + case ELEVATOR_DISCARD_MERGE: + merged = bio_attempt_discard_merge(q, rq, bio); + break; + default: + break; } + + if (merged) + return true; } -out: - return ret; + + return false; } unsigned int blk_plug_queued_count(struct request_queue *q) @@ -1609,7 +1613,6 @@ out: void init_request_from_bio(struct request *req, struct bio *bio) { - req->cmd_type = REQ_TYPE_FS; if (bio->bi_opf & REQ_RAHEAD) req->cmd_flags |= REQ_FAILFAST_MASK; @@ -1623,8 +1626,8 @@ void init_request_from_bio(struct request *req, struct bio *bio) static blk_qc_t blk_queue_bio(struct request_queue *q, struct bio *bio) { struct blk_plug *plug; - int el_ret, where = ELEVATOR_INSERT_SORT; - struct request *req; + int where = ELEVATOR_INSERT_SORT; + struct request *req, *free; unsigned int request_count = 0; unsigned int wb_acct; @@ -1661,21 +1664,29 @@ static blk_qc_t blk_queue_bio(struct request_queue *q, struct bio *bio) spin_lock_irq(q->queue_lock); - el_ret = elv_merge(q, &req, bio); - if (el_ret == ELEVATOR_BACK_MERGE) { - if (bio_attempt_back_merge(q, req, bio)) { - elv_bio_merged(q, req, bio); - if (!attempt_back_merge(q, req)) - elv_merged_request(q, req, el_ret); - goto out_unlock; - } - } else if (el_ret == ELEVATOR_FRONT_MERGE) { - if (bio_attempt_front_merge(q, req, bio)) { - elv_bio_merged(q, req, bio); - if (!attempt_front_merge(q, req)) - elv_merged_request(q, req, el_ret); - goto out_unlock; - } + switch (elv_merge(q, &req, bio)) { + case ELEVATOR_BACK_MERGE: + if (!bio_attempt_back_merge(q, req, bio)) + break; + elv_bio_merged(q, req, bio); + free = attempt_back_merge(q, req); + if (free) + __blk_put_request(q, free); + else + elv_merged_request(q, req, ELEVATOR_BACK_MERGE); + goto out_unlock; + case ELEVATOR_FRONT_MERGE: + if (!bio_attempt_front_merge(q, req, bio)) + break; + elv_bio_merged(q, req, bio); + free = attempt_front_merge(q, req); + if (free) + __blk_put_request(q, free); + else + elv_merged_request(q, req, ELEVATOR_FRONT_MERGE); + goto out_unlock; + default: + break; } get_rq: @@ -2452,14 +2463,6 @@ void blk_start_request(struct request *req) wbt_issue(req->q->rq_wb, &req->issue_stat); } - /* - * We are now handing the request to the hardware, initialize - * resid_len to full count and add the timeout handler. - */ - req->resid_len = blk_rq_bytes(req); - if (unlikely(blk_bidi_rq(req))) - req->next_rq->resid_len = blk_rq_bytes(req->next_rq); - BUG_ON(test_bit(REQ_ATOM_COMPLETE, &req->atomic_flags)); blk_add_timer(req); } @@ -2530,10 +2533,10 @@ bool blk_update_request(struct request *req, int error, unsigned int nr_bytes) * TODO: tj: This is too subtle. It would be better to let * low level drivers do what they see fit. */ - if (req->cmd_type == REQ_TYPE_FS) + if (!blk_rq_is_passthrough(req)) req->errors = 0; - if (error && req->cmd_type == REQ_TYPE_FS && + if (error && !blk_rq_is_passthrough(req) && !(req->rq_flags & RQF_QUIET)) { char *error_type; @@ -2605,7 +2608,7 @@ bool blk_update_request(struct request *req, int error, unsigned int nr_bytes) req->__data_len -= total_bytes; /* update sector only for requests with clear definition of sector */ - if (req->cmd_type == REQ_TYPE_FS) + if (!blk_rq_is_passthrough(req)) req->__sector += total_bytes >> 9; /* mixed attributes always follow the first bio */ @@ -2683,8 +2686,8 @@ void blk_finish_request(struct request *req, int error) BUG_ON(blk_queued_rq(req)); - if (unlikely(laptop_mode) && req->cmd_type == REQ_TYPE_FS) - laptop_io_completion(&req->q->backing_dev_info); + if (unlikely(laptop_mode) && !blk_rq_is_passthrough(req)) + laptop_io_completion(req->q->backing_dev_info); blk_delete_timer(req); @@ -3007,8 +3010,6 @@ EXPORT_SYMBOL_GPL(blk_rq_unprep_clone); static void __blk_rq_prep_clone(struct request *dst, struct request *src) { dst->cpu = src->cpu; - dst->cmd_flags = src->cmd_flags | REQ_NOMERGE; - dst->cmd_type = src->cmd_type; dst->__sector = blk_rq_pos(src); dst->__data_len = blk_rq_bytes(src); dst->nr_phys_segments = src->nr_phys_segments; @@ -3484,5 +3485,9 @@ int __init blk_dev_init(void) blk_requestq_cachep = kmem_cache_create("request_queue", sizeof(struct request_queue), 0, SLAB_PANIC, NULL); +#ifdef CONFIG_DEBUG_FS + blk_debugfs_root = debugfs_create_dir("block", NULL); +#endif + return 0; } diff --git a/block/blk-exec.c b/block/blk-exec.c index ed1f10165268..8cd0e9bc8dc8 100644 --- a/block/blk-exec.c +++ b/block/blk-exec.c @@ -11,11 +11,6 @@ #include "blk.h" #include "blk-mq-sched.h" -/* - * for max sense size - */ -#include <scsi/scsi_cmnd.h> - /** * blk_end_sync_rq - executes a completion event on a request * @rq: request to complete @@ -56,7 +51,7 @@ void blk_execute_rq_nowait(struct request_queue *q, struct gendisk *bd_disk, int where = at_head ? ELEVATOR_INSERT_FRONT : ELEVATOR_INSERT_BACK; WARN_ON(irqs_disabled()); - WARN_ON(rq->cmd_type == REQ_TYPE_FS); + WARN_ON(!blk_rq_is_passthrough(rq)); rq->rq_disk = bd_disk; rq->end_io = done; @@ -101,16 +96,9 @@ int blk_execute_rq(struct request_queue *q, struct gendisk *bd_disk, struct request *rq, int at_head) { DECLARE_COMPLETION_ONSTACK(wait); - char sense[SCSI_SENSE_BUFFERSIZE]; int err = 0; unsigned long hang_check; - if (!rq->sense) { - memset(sense, 0, sizeof(sense)); - rq->sense = sense; - rq->sense_len = 0; - } - rq->end_io_data = &wait; blk_execute_rq_nowait(q, bd_disk, rq, at_head, blk_end_sync_rq); @@ -124,11 +112,6 @@ int blk_execute_rq(struct request_queue *q, struct gendisk *bd_disk, if (rq->errors) err = -EIO; - if (rq->sense == sense) { - rq->sense = NULL; - rq->sense_len = 0; - } - return err; } EXPORT_SYMBOL(blk_execute_rq); diff --git a/block/blk-flush.c b/block/blk-flush.c index 4427896641ac..0d5a9c1da1fc 100644 --- a/block/blk-flush.c +++ b/block/blk-flush.c @@ -297,8 +297,14 @@ static bool blk_kick_flush(struct request_queue *q, struct blk_flush_queue *fq) if (fq->flush_pending_idx != fq->flush_running_idx || list_empty(pending)) return false; - /* C2 and C3 */ + /* C2 and C3 + * + * For blk-mq + scheduling, we can risk having all driver tags + * assigned to empty flushes, and we deadlock if we are expecting + * other requests to make progress. Don't defer for that case. + */ if (!list_empty(&fq->flush_data_in_flight) && + !(q->mq_ops && q->elevator) && time_before(jiffies, fq->flush_pending_since + FLUSH_PENDING_TIMEOUT)) return false; @@ -327,7 +333,6 @@ static bool blk_kick_flush(struct request_queue *q, struct blk_flush_queue *fq) blk_mq_tag_set_rq(hctx, first_rq->tag, flush_rq); } - flush_rq->cmd_type = REQ_TYPE_FS; flush_rq->cmd_flags = REQ_OP_FLUSH | REQ_PREFLUSH; flush_rq->rq_flags |= RQF_FLUSH_SEQ; flush_rq->rq_disk = first_rq->rq_disk; @@ -547,11 +552,10 @@ struct blk_flush_queue *blk_alloc_flush_queue(struct request_queue *q, if (!fq) goto fail; - if (q->mq_ops) { + if (q->mq_ops) spin_lock_init(&fq->mq_flush_lock); - rq_sz = round_up(rq_sz + cmd_size, cache_line_size()); - } + rq_sz = round_up(rq_sz + cmd_size, cache_line_size()); fq->flush_rq = kzalloc_node(rq_sz, GFP_KERNEL, node); if (!fq->flush_rq) goto fail_rq; diff --git a/block/blk-integrity.c b/block/blk-integrity.c index d69c5c79f98e..9f0ff5ba4f84 100644 --- a/block/blk-integrity.c +++ b/block/blk-integrity.c @@ -443,10 +443,10 @@ void blk_integrity_revalidate(struct gendisk *disk) return; if (bi->profile) - disk->queue->backing_dev_info.capabilities |= + disk->queue->backing_dev_info->capabilities |= BDI_CAP_STABLE_WRITES; else - disk->queue->backing_dev_info.capabilities &= + disk->queue->backing_dev_info->capabilities &= ~BDI_CAP_STABLE_WRITES; } diff --git a/block/blk-ioc.c b/block/blk-ioc.c index fe186a9eade9..b12f9c87b4c3 100644 --- a/block/blk-ioc.c +++ b/block/blk-ioc.c @@ -35,7 +35,10 @@ static void icq_free_icq_rcu(struct rcu_head *head) kmem_cache_free(icq->__rcu_icq_cache, icq); } -/* Exit an icq. Called with both ioc and q locked. */ +/* + * Exit an icq. Called with both ioc and q locked for sq, only ioc locked for + * mq. + */ static void ioc_exit_icq(struct io_cq *icq) { struct elevator_type *et = icq->q->elevator->type; @@ -166,6 +169,7 @@ EXPORT_SYMBOL(put_io_context); */ void put_io_context_active(struct io_context *ioc) { + struct elevator_type *et; unsigned long flags; struct io_cq *icq; @@ -184,13 +188,19 @@ retry: hlist_for_each_entry(icq, &ioc->icq_list, ioc_node) { if (icq->flags & ICQ_EXITED) continue; - if (spin_trylock(icq->q->queue_lock)) { + + et = icq->q->elevator->type; + if (et->uses_mq) { ioc_exit_icq(icq); - spin_unlock(icq->q->queue_lock); } else { - spin_unlock_irqrestore(&ioc->lock, flags); - cpu_relax(); - goto retry; + if (spin_trylock(icq->q->queue_lock)) { + ioc_exit_icq(icq); + spin_unlock(icq->q->queue_lock); + } else { + spin_unlock_irqrestore(&ioc->lock, flags); + cpu_relax(); + goto retry; + } } } spin_unlock_irqrestore(&ioc->lock, flags); diff --git a/block/blk-map.c b/block/blk-map.c index 0acb6640ead7..2f18c2a0be1b 100644 --- a/block/blk-map.c +++ b/block/blk-map.c @@ -16,8 +16,6 @@ |