| /* SPDX-License-Identifier: GPL-2.0 */ |
| #ifndef _LINUX_BLKDEV_H |
| #define _LINUX_BLKDEV_H |
| |
| #include <linux/sched.h> |
| #include <linux/sched/clock.h> |
| #include <linux/major.h> |
| #include <linux/genhd.h> |
| #include <linux/list.h> |
| #include <linux/llist.h> |
| #include <linux/minmax.h> |
| #include <linux/timer.h> |
| #include <linux/workqueue.h> |
| #include <linux/pagemap.h> |
| #include <linux/backing-dev-defs.h> |
| #include <linux/wait.h> |
| #include <linux/mempool.h> |
| #include <linux/pfn.h> |
| #include <linux/bio.h> |
| #include <linux/stringify.h> |
| #include <linux/gfp.h> |
| #include <linux/bsg.h> |
| #include <linux/smp.h> |
| #include <linux/rcupdate.h> |
| #include <linux/percpu-refcount.h> |
| #include <linux/scatterlist.h> |
| #include <linux/blkzoned.h> |
| #include <linux/pm.h> |
| |
| struct module; |
| struct scsi_ioctl_command; |
| |
| struct request_queue; |
| struct elevator_queue; |
| struct blk_trace; |
| struct request; |
| struct sg_io_hdr; |
| struct bsg_job; |
| struct blkcg_gq; |
| struct blk_flush_queue; |
| struct pr_ops; |
| struct rq_qos; |
| struct blk_queue_stats; |
| struct blk_stat_callback; |
| struct blk_keyslot_manager; |
| |
| #define BLKDEV_MIN_RQ 4 |
| #define BLKDEV_MAX_RQ 128 /* Default maximum */ |
| |
| /* Must be consistent with blk_mq_poll_stats_bkt() */ |
| #define BLK_MQ_POLL_STATS_BKTS 16 |
| |
| /* Doing classic polling */ |
| #define BLK_MQ_POLL_CLASSIC -1 |
| |
| /* |
| * Maximum number of blkcg policies allowed to be registered concurrently. |
| * Defined here to simplify include dependency. |
| */ |
| #define BLKCG_MAX_POLS 5 |
| |
| typedef void (rq_end_io_fn)(struct request *, blk_status_t); |
| |
| /* |
| * request flags */ |
| typedef __u32 __bitwise req_flags_t; |
| |
| /* drive already may have started this one */ |
| #define RQF_STARTED ((__force req_flags_t)(1 << 1)) |
| /* may not be passed by ioscheduler */ |
| #define RQF_SOFTBARRIER ((__force req_flags_t)(1 << 3)) |
| /* request for flush sequence */ |
| #define RQF_FLUSH_SEQ ((__force req_flags_t)(1 << 4)) |
| /* merge of different types, fail separately */ |
| #define RQF_MIXED_MERGE ((__force req_flags_t)(1 << 5)) |
| /* track inflight for MQ */ |
| #define RQF_MQ_INFLIGHT ((__force req_flags_t)(1 << 6)) |
| /* don't call prep for this one */ |
| #define RQF_DONTPREP ((__force req_flags_t)(1 << 7)) |
| /* vaguely specified driver internal error. Ignored by the block layer */ |
| #define RQF_FAILED ((__force req_flags_t)(1 << 10)) |
| /* don't warn about errors */ |
| #define RQF_QUIET ((__force req_flags_t)(1 << 11)) |
| /* elevator private data attached */ |
| #define RQF_ELVPRIV ((__force req_flags_t)(1 << 12)) |
| /* account into disk and partition IO statistics */ |
| #define RQF_IO_STAT ((__force req_flags_t)(1 << 13)) |
| /* request came from our alloc pool */ |
| #define RQF_ALLOCED ((__force req_flags_t)(1 << 14)) |
| /* runtime pm request */ |
| #define RQF_PM ((__force req_flags_t)(1 << 15)) |
| /* on IO scheduler merge hash */ |
| #define RQF_HASHED ((__force req_flags_t)(1 << 16)) |
| /* track IO completion time */ |
| #define RQF_STATS ((__force req_flags_t)(1 << 17)) |
| /* Look at ->special_vec for the actual data payload instead of the |
| bio chain. */ |
| #define RQF_SPECIAL_PAYLOAD ((__force req_flags_t)(1 << 18)) |
| /* The per-zone write lock is held for this request */ |
| #define RQF_ZONE_WRITE_LOCKED ((__force req_flags_t)(1 << 19)) |
| /* already slept for hybrid poll */ |
| #define RQF_MQ_POLL_SLEPT ((__force req_flags_t)(1 << 20)) |
| /* ->timeout has been called, don't expire again */ |
| #define RQF_TIMED_OUT ((__force req_flags_t)(1 << 21)) |
| |
| /* flags that prevent us from merging requests: */ |
| #define RQF_NOMERGE_FLAGS \ |
| (RQF_STARTED | RQF_SOFTBARRIER | RQF_FLUSH_SEQ | RQF_SPECIAL_PAYLOAD) |
| |
| /* |
| * Request state for blk-mq. |
| */ |
| enum mq_rq_state { |
| MQ_RQ_IDLE = 0, |
| MQ_RQ_IN_FLIGHT = 1, |
| MQ_RQ_COMPLETE = 2, |
| }; |
| |
| /* |
| * Try to put the fields that are referenced together in the same cacheline. |
| * |
| * If you modify this structure, make sure to update blk_rq_init() and |
| * especially blk_mq_rq_ctx_init() to take care of the added fields. |
| */ |
| struct request { |
| struct request_queue *q; |
| struct blk_mq_ctx *mq_ctx; |
| struct blk_mq_hw_ctx *mq_hctx; |
| |
| unsigned int cmd_flags; /* op and common flags */ |
| req_flags_t rq_flags; |
| |
| int tag; |
| int internal_tag; |
| |
| /* the following two fields are internal, NEVER access directly */ |
| unsigned int __data_len; /* total data len */ |
| sector_t __sector; /* sector cursor */ |
| |
| struct bio *bio; |
| struct bio *biotail; |
| |
| struct list_head queuelist; |
| |
| /* |
| * The hash is used inside the scheduler, and killed once the |
| * request reaches the dispatch list. The ipi_list is only used |
| * to queue the request for softirq completion, which is long |
| * after the request has been unhashed (and even removed from |
| * the dispatch list). |
| */ |
| union { |
| struct hlist_node hash; /* merge hash */ |
| struct llist_node ipi_list; |
| }; |
| |
| /* |
| * The rb_node is only used inside the io scheduler, requests |
| * are pruned when moved to the dispatch queue. So let the |
| * completion_data share space with the rb_node. |
| */ |
| union { |
| struct rb_node rb_node; /* sort/lookup */ |
| struct bio_vec special_vec; |
| void *completion_data; |
| int error_count; /* for legacy drivers, don't use */ |
| }; |
| |
| /* |
| * Three pointers are available for the IO schedulers, if they need |
| * more they have to dynamically allocate it. Flush requests are |
| * never put on the IO scheduler. So let the flush fields share |
| * space with the elevator data. |
| */ |
| union { |
| struct { |
| struct io_cq *icq; |
| void *priv[2]; |
| } elv; |
| |
| struct { |
| unsigned int seq; |
| struct list_head list; |
| rq_end_io_fn *saved_end_io; |
| } flush; |
| }; |
| |
| struct gendisk *rq_disk; |
| struct block_device *part; |
| #ifdef CONFIG_BLK_RQ_ALLOC_TIME |
| /* Time that the first bio started allocating this request. */ |
| u64 alloc_time_ns; |
| #endif |
| /* Time that this request was allocated for this IO. */ |
| u64 start_time_ns; |
| /* Time that I/O was submitted to the device. */ |
| u64 io_start_time_ns; |
| |
| #ifdef CONFIG_BLK_WBT |
| unsigned short wbt_flags; |
| #endif |
| /* |
| * rq sectors used for blk stats. It has the same value |
| * with blk_rq_sectors(rq), except that it never be zeroed |
| * by completion. |
| */ |
| unsigned short stats_sectors; |
| |
| /* |
| * Number of scatter-gather DMA addr+len pairs after |
| * physical address coalescing is performed. |
| */ |
| unsigned short nr_phys_segments; |
| |
| #if defined(CONFIG_BLK_DEV_INTEGRITY) |
| unsigned short nr_integrity_segments; |
| #endif |
| |
| #ifdef CONFIG_BLK_INLINE_ENCRYPTION |
| struct bio_crypt_ctx *crypt_ctx; |
| struct blk_ksm_keyslot *crypt_keyslot; |
| #endif |
| |
| unsigned short write_hint; |
| unsigned short ioprio; |
| |
| enum mq_rq_state state; |
| refcount_t ref; |
| |
| unsigned int timeout; |
| unsigned long deadline; |
| |
| union { |
| struct __call_single_data csd; |
| u64 fifo_time; |
| }; |
| |
| /* |
| * completion callback. |
| */ |
| rq_end_io_fn *end_io; |
| void *end_io_data; |
| }; |
| |
| static inline bool blk_op_is_scsi(unsigned int op) |
| { |
| return op == REQ_OP_SCSI_IN || op == REQ_OP_SCSI_OUT; |
| } |
| |
| static inline bool blk_op_is_private(unsigned int op) |
| { |
| return op == REQ_OP_DRV_IN || op == REQ_OP_DRV_OUT; |
| } |
| |
| static inline bool blk_rq_is_scsi(struct request *rq) |
| { |
| return blk_op_is_scsi(req_op(rq)); |
| } |
| |
| static inline bool blk_rq_is_private(struct request *rq) |
| { |
| return blk_op_is_private(req_op(rq)); |
| } |
| |
| static inline bool blk_rq_is_passthrough(struct request *rq) |
| { |
| return blk_rq_is_scsi(rq) || blk_rq_is_private(rq); |
| } |
| |
| static inline bool bio_is_passthrough(struct bio *bio) |
| { |
| unsigned op = bio_op(bio); |
| |
| return blk_op_is_scsi(op) || blk_op_is_private(op); |
| } |
| |
| static inline unsigned short req_get_ioprio(struct request *req) |
| { |
| return req->ioprio; |
| } |
| |
| #include <linux/elevator.h> |
| |
| struct blk_queue_ctx; |
| |
| struct bio_vec; |
| |
| enum blk_eh_timer_return { |
| BLK_EH_DONE, /* drivers has completed the command */ |
| BLK_EH_RESET_TIMER, /* reset timer and try again */ |
| }; |
| |
| enum blk_queue_state { |
| Queue_down, |
| Queue_up, |
| }; |
| |
| #define BLK_TAG_ALLOC_FIFO 0 /* allocate starting from 0 */ |
| #define BLK_TAG_ALLOC_RR 1 /* allocate starting from last allocated tag */ |
| |
| #define BLK_SCSI_MAX_CMDS (256) |
| #define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8)) |
| |
| /* |
| * Zoned block device models (zoned limit). |
| * |
| * Note: This needs to be ordered from the least to the most severe |
| * restrictions for the inheritance in blk_stack_limits() to work. |
| */ |
| enum blk_zoned_model { |
| BLK_ZONED_NONE = 0, /* Regular block device */ |
| BLK_ZONED_HA, /* Host-aware zoned block device */ |
| BLK_ZONED_HM, /* Host-managed zoned block device */ |
| }; |
| |
| struct queue_limits { |
| unsigned long bounce_pfn; |
| unsigned long seg_boundary_mask; |
| unsigned long virt_boundary_mask; |
| |
| unsigned int max_hw_sectors; |
| unsigned int max_dev_sectors; |
| unsigned int chunk_sectors; |
| unsigned int max_sectors; |
| unsigned int max_segment_size; |
| unsigned int physical_block_size; |
| unsigned int logical_block_size; |
| unsigned int alignment_offset; |
| unsigned int io_min; |
| unsigned int io_opt; |
| unsigned int max_discard_sectors; |
| unsigned int max_hw_discard_sectors; |
| unsigned int max_write_same_sectors; |
| unsigned int max_write_zeroes_sectors; |
| unsigned int max_zone_append_sectors; |
| unsigned int discard_granularity; |
| unsigned int discard_alignment; |
| unsigned int zone_write_granularity; |
| |
| unsigned short max_segments; |
| unsigned short max_integrity_segments; |
| unsigned short max_discard_segments; |
| |
| unsigned char misaligned; |
| unsigned char discard_misaligned; |
| unsigned char raid_partial_stripes_expensive; |
| enum blk_zoned_model zoned; |
| }; |
| |
| typedef int (*report_zones_cb)(struct blk_zone *zone, unsigned int idx, |
| void *data); |
| |
| void blk_queue_set_zoned(struct gendisk *disk, enum blk_zoned_model model); |
| |
| #ifdef CONFIG_BLK_DEV_ZONED |
| |
| #define BLK_ALL_ZONES ((unsigned int)-1) |
| int blkdev_report_zones(struct block_device *bdev, sector_t sector, |
| unsigned int nr_zones, report_zones_cb cb, void *data); |
| unsigned int blkdev_nr_zones(struct gendisk *disk); |
| extern int blkdev_zone_mgmt(struct block_device *bdev, enum req_opf op, |
| sector_t sectors, sector_t nr_sectors, |
| gfp_t gfp_mask); |
| int blk_revalidate_disk_zones(struct gendisk *disk, |
| void (*update_driver_data)(struct gendisk *disk)); |
| |
| extern int blkdev_report_zones_ioctl(struct block_device *bdev, fmode_t mode, |
| unsigned int cmd, unsigned long arg); |
| extern int blkdev_zone_mgmt_ioctl(struct block_device *bdev, fmode_t mode, |
| unsigned int cmd, unsigned long arg); |
| |
| #else /* CONFIG_BLK_DEV_ZONED */ |
| |
| static inline unsigned int blkdev_nr_zones(struct gendisk *disk) |
| { |
| return 0; |
| } |
| |
| static inline int blkdev_report_zones_ioctl(struct block_device *bdev, |
| fmode_t mode, unsigned int cmd, |
| unsigned long arg) |
| { |
| return -ENOTTY; |
| } |
| |
| static inline int blkdev_zone_mgmt_ioctl(struct block_device *bdev, |
| fmode_t mode, unsigned int cmd, |
| unsigned long arg) |
| { |
| return -ENOTTY; |
| } |
| |
| #endif /* CONFIG_BLK_DEV_ZONED */ |
| |
| struct request_queue { |
| struct request *last_merge; |
| struct elevator_queue *elevator; |
| |
| struct percpu_ref q_usage_counter; |
| |
| struct blk_queue_stats *stats; |
| struct rq_qos *rq_qos; |
| |
| const struct blk_mq_ops *mq_ops; |
| |
| /* sw queues */ |
| struct blk_mq_ctx __percpu *queue_ctx; |
| |
| unsigned int queue_depth; |
| |
| /* hw dispatch queues */ |
| struct blk_mq_hw_ctx **queue_hw_ctx; |
| unsigned int nr_hw_queues; |
| |
| struct backing_dev_info *backing_dev_info; |
| |
| /* |
| * The queue owner gets to use this for whatever they like. |
| * ll_rw_blk doesn't touch it. |
| */ |
| void *queuedata; |
| |
| /* |
| * various queue flags, see QUEUE_* below |
| */ |
| unsigned long queue_flags; |
| /* |
| * Number of contexts that have called blk_set_pm_only(). If this |
| * counter is above zero then only RQF_PM requests are processed. |
| */ |
| atomic_t pm_only; |
| |
| /* |
| * ida allocated id for this queue. Used to index queues from |
| * ioctx. |
| */ |
| int id; |
| |
| /* |
| * queue needs bounce pages for pages above this limit |
| */ |
| gfp_t bounce_gfp; |
| |
| spinlock_t queue_lock; |
| |
| /* |
| * queue kobject |
| */ |
| struct kobject kobj; |
| |
| /* |
| * mq queue kobject |
| */ |
| struct kobject *mq_kobj; |
| |
| #ifdef CONFIG_BLK_DEV_INTEGRITY |
| struct blk_integrity integrity; |
| #endif /* CONFIG_BLK_DEV_INTEGRITY */ |
| |
| #ifdef CONFIG_PM |
| struct device *dev; |
| enum rpm_status rpm_status; |
| #endif |
| |
| /* |
| * queue settings |
| */ |
| unsigned long nr_requests; /* Max # of requests */ |
| |
| unsigned int dma_pad_mask; |
| unsigned int dma_alignment; |
| |
| #ifdef CONFIG_BLK_INLINE_ENCRYPTION |
| /* Inline crypto capabilities */ |
| struct blk_keyslot_manager *ksm; |
| #endif |
| |
| unsigned int rq_timeout; |
| int poll_nsec; |
| |
| struct blk_stat_callback *poll_cb; |
| struct blk_rq_stat poll_stat[BLK_MQ_POLL_STATS_BKTS]; |
| |
| struct timer_list timeout; |
| struct work_struct timeout_work; |
| |
| atomic_t nr_active_requests_shared_sbitmap; |
| |
| struct list_head icq_list; |
| #ifdef CONFIG_BLK_CGROUP |
| DECLARE_BITMAP (blkcg_pols, BLKCG_MAX_POLS); |
| struct blkcg_gq *root_blkg; |
| struct list_head blkg_list; |
| #endif |
| |
| struct queue_limits limits; |
| |
| unsigned int required_elevator_features; |
| |
| #ifdef CONFIG_BLK_DEV_ZONED |
| /* |
| * Zoned block device information for request dispatch control. |
| * nr_zones is the total number of zones of the device. This is always |
| * 0 for regular block devices. conv_zones_bitmap is a bitmap of nr_zones |
| * bits which indicates if a zone is conventional (bit set) or |
| * sequential (bit clear). seq_zones_wlock is a bitmap of nr_zones |
| * bits which indicates if a zone is write locked, that is, if a write |
| * request targeting the zone was dispatched. All three fields are |
| * initialized by the low level device driver (e.g. scsi/sd.c). |
| * Stacking drivers (device mappers) may or may not initialize |
| * these fields. |
| * |
| * Reads of this information must be protected with blk_queue_enter() / |
| * blk_queue_exit(). Modifying this information is only allowed while |
| * no requests are being processed. See also blk_mq_freeze_queue() and |
| * blk_mq_unfreeze_queue(). |
| */ |
| unsigned int nr_zones; |
| unsigned long *conv_zones_bitmap; |
| unsigned long *seq_zones_wlock; |
| unsigned int max_open_zones; |
| unsigned int max_active_zones; |
| #endif /* CONFIG_BLK_DEV_ZONED */ |
| |
| /* |
| * sg stuff |
| */ |
| unsigned int sg_timeout; |
| unsigned int sg_reserved_size; |
| int node; |
| struct mutex debugfs_mutex; |
| #ifdef CONFIG_BLK_DEV_IO_TRACE |
| struct blk_trace __rcu *blk_trace; |
| #endif |
| /* |
| * for flush operations |
| */ |
| struct blk_flush_queue *fq; |
| |
| struct list_head requeue_list; |
| spinlock_t requeue_lock; |
| struct delayed_work requeue_work; |
| |
| struct mutex sysfs_lock; |
| struct mutex sysfs_dir_lock; |
| |
| /* |
| * for reusing dead hctx instance in case of updating |
| * nr_hw_queues |
| */ |
| struct list_head unused_hctx_list; |
| spinlock_t unused_hctx_lock; |
| |
| int mq_freeze_depth; |
| |
| #if defined(CONFIG_BLK_DEV_BSG) |
| struct bsg_class_device bsg_dev; |
| #endif |
| |
| #ifdef CONFIG_BLK_DEV_THROTTLING |
| /* Throttle data */ |
| struct throtl_data *td; |
| #endif |
| struct rcu_head rcu_head; |
| wait_queue_head_t mq_freeze_wq; |
| /* |
| * Protect concurrent access to q_usage_counter by |
| * percpu_ref_kill() and percpu_ref_reinit(). |
| */ |
| struct mutex mq_freeze_lock; |
| |
| struct blk_mq_tag_set *tag_set; |
| struct list_head tag_set_list; |
| struct bio_set bio_split; |
| |
| struct dentry *debugfs_dir; |
| |
| #ifdef CONFIG_BLK_DEBUG_FS |
| struct dentry *sched_debugfs_dir; |
| struct dentry *rqos_debugfs_dir; |
| #endif |
| |
| bool mq_sysfs_init_done; |
| |
| size_t cmd_size; |
| |
| #define BLK_MAX_WRITE_HINTS 5 |
| u64 write_hints[BLK_MAX_WRITE_HINTS]; |
| }; |
| |
| /* Keep blk_queue_flag_name[] in sync with the definitions below */ |
| #define QUEUE_FLAG_STOPPED 0 /* queue is stopped */ |
| #define QUEUE_FLAG_DYING 1 /* queue being torn down */ |
| #define QUEUE_FLAG_NOMERGES 3 /* disable merge attempts */ |
| #define QUEUE_FLAG_SAME_COMP 4 /* complete on same CPU-group */ |
| #define QUEUE_FLAG_FAIL_IO 5 /* fake timeout */ |
| #define QUEUE_FLAG_NONROT 6 /* non-rotational device (SSD) */ |
| #define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */ |
| #define QUEUE_FLAG_IO_STAT 7 /* do disk/partitions IO accounting */ |
| #define QUEUE_FLAG_DISCARD 8 /* supports DISCARD */ |
| #define QUEUE_FLAG_NOXMERGES 9 /* No extended merges */ |
| #define QUEUE_FLAG_ADD_RANDOM 10 /* Contributes to random pool */ |
| #define QUEUE_FLAG_SECERASE 11 /* supports secure erase */ |
| #define QUEUE_FLAG_SAME_FORCE 12 /* force complete on same CPU */ |
| #define QUEUE_FLAG_DEAD 13 /* queue tear-down finished */ |
| #define QUEUE_FLAG_INIT_DONE 14 /* queue is initialized */ |
| #define QUEUE_FLAG_STABLE_WRITES 15 /* don't modify blks until WB is done */ |
| #define QUEUE_FLAG_POLL 16 /* IO polling enabled if set */ |
| #define QUEUE_FLAG_WC 17 /* Write back caching */ |
| #define QUEUE_FLAG_FUA 18 /* device supports FUA writes */ |
| #define QUEUE_FLAG_DAX 19 /* device supports DAX */ |
| #define QUEUE_FLAG_STATS 20 /* track IO start and completion times */ |
| #define QUEUE_FLAG_POLL_STATS 21 /* collecting stats for hybrid polling */ |
| #define QUEUE_FLAG_REGISTERED 22 /* queue has been registered to a disk */ |
| #define QUEUE_FLAG_SCSI_PASSTHROUGH 23 /* queue supports SCSI commands */ |
| #define QUEUE_FLAG_QUIESCED 24 /* queue has been quiesced */ |
| #define QUEUE_FLAG_PCI_P2PDMA 25 /* device supports PCI p2p requests */ |
| #define QUEUE_FLAG_ZONE_RESETALL 26 /* supports Zone Reset All */ |
| #define QUEUE_FLAG_RQ_ALLOC_TIME 27 /* record rq->alloc_time_ns */ |
| #define QUEUE_FLAG_HCTX_ACTIVE 28 /* at least one blk-mq hctx is active */ |
| #define QUEUE_FLAG_NOWAIT 29 /* device supports NOWAIT */ |
| |
| #define QUEUE_FLAG_MQ_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \ |
| (1 << QUEUE_FLAG_SAME_COMP) | \ |
| (1 << QUEUE_FLAG_NOWAIT)) |
| |
| void blk_queue_flag_set(unsigned int flag, struct request_queue *q); |
| void blk_queue_flag_clear(unsigned int flag, struct request_queue *q); |
| bool blk_queue_flag_test_and_set(unsigned int flag, struct request_queue *q); |
| |
| #define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags) |
| #define blk_queue_dying(q) test_bit(QUEUE_FLAG_DYING, &(q)->queue_flags) |
| #define blk_queue_dead(q) test_bit(QUEUE_FLAG_DEAD, &(q)->queue_flags) |
| #define blk_queue_init_done(q) test_bit(QUEUE_FLAG_INIT_DONE, &(q)->queue_flags) |
| #define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags) |
| #define blk_queue_noxmerges(q) \ |
| test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags) |
| #define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags) |
| #define blk_queue_stable_writes(q) \ |
| test_bit(QUEUE_FLAG_STABLE_WRITES, &(q)->queue_flags) |
| #define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags) |
| #define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags) |
| #define blk_queue_discard(q) test_bit(QUEUE_FLAG_DISCARD, &(q)->queue_flags) |
| #define blk_queue_zone_resetall(q) \ |
| test_bit(QUEUE_FLAG_ZONE_RESETALL, &(q)->queue_flags) |
| #define blk_queue_secure_erase(q) \ |
| (test_bit(QUEUE_FLAG_SECERASE, &(q)->queue_flags)) |
| #define blk_queue_dax(q) test_bit(QUEUE_FLAG_DAX, &(q)->queue_flags) |
| #define blk_queue_scsi_passthrough(q) \ |
| test_bit(QUEUE_FLAG_SCSI_PASSTHROUGH, &(q)->queue_flags) |
| #define blk_queue_pci_p2pdma(q) \ |
| test_bit(QUEUE_FLAG_PCI_P2PDMA, &(q)->queue_flags) |
| #ifdef CONFIG_BLK_RQ_ALLOC_TIME |
| #define blk_queue_rq_alloc_time(q) \ |
| test_bit(QUEUE_FLAG_RQ_ALLOC_TIME, &(q)->queue_flags) |
| #else |
| #define blk_queue_rq_alloc_time(q) false |
| #endif |
| |
| #define blk_noretry_request(rq) \ |
| ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \ |
| REQ_FAILFAST_DRIVER)) |
| #define blk_queue_quiesced(q) test_bit(QUEUE_FLAG_QUIESCED, &(q)->queue_flags) |
| #define blk_queue_pm_only(q) atomic_read(&(q)->pm_only) |
| #define blk_queue_fua(q) test_bit(QUEUE_FLAG_FUA, &(q)->queue_flags) |
| #define blk_queue_registered(q) test_bit(QUEUE_FLAG_REGISTERED, &(q)->queue_flags) |
| #define blk_queue_nowait(q) test_bit(QUEUE_FLAG_NOWAIT, &(q)->queue_flags) |
| |
| extern void blk_set_pm_only(struct request_queue *q); |
| extern void blk_clear_pm_only(struct request_queue *q); |
| |
| static inline bool blk_account_rq(struct request *rq) |
| { |
| return (rq->rq_flags & RQF_STARTED) && !blk_rq_is_passthrough(rq); |
| } |
| |
| #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist) |
| |
| #define rq_data_dir(rq) (op_is_write(req_op(rq)) ? WRITE : READ) |
| |
| #define rq_dma_dir(rq) \ |
| (op_is_write(req_op(rq)) ? DMA_TO_DEVICE : DMA_FROM_DEVICE) |
| |
| #define dma_map_bvec(dev, bv, dir, attrs) \ |
| dma_map_page_attrs(dev, (bv)->bv_page, (bv)->bv_offset, (bv)->bv_len, \ |
| (dir), (attrs)) |
| |
| static inline bool queue_is_mq(struct request_queue *q) |
| { |
| return q->mq_ops; |
| } |
| |
| #ifdef CONFIG_PM |
| static inline enum rpm_status queue_rpm_status(struct request_queue *q) |
| { |
| return q->rpm_status; |
| } |
| #else |
| static inline enum rpm_status queue_rpm_status(struct request_queue *q) |
| { |
| return RPM_ACTIVE; |
| } |
| #endif |
| |
| static inline enum blk_zoned_model |
| blk_queue_zoned_model(struct request_queue *q) |
| { |
| if (IS_ENABLED(CONFIG_BLK_DEV_ZONED)) |
| return q->limits.zoned; |
| return BLK_ZONED_NONE; |
| } |
| |
| static inline bool blk_queue_is_zoned(struct request_queue *q) |
| { |
| switch (blk_queue_zoned_model(q)) { |
| case BLK_ZONED_HA: |
| case BLK_ZONED_HM: |
| return true; |
| default: |
| return false; |
| } |
| } |
| |
| static inline sector_t blk_queue_zone_sectors(struct request_queue *q) |
| { |
| return blk_queue_is_zoned(q) ? q->limits.chunk_sectors : 0; |
| } |
| |
| #ifdef CONFIG_BLK_DEV_ZONED |
| static inline unsigned int blk_queue_nr_zones(struct request_queue *q) |
| { |
| return blk_queue_is_zoned(q) ? q->nr_zones : 0; |
| } |
| |
| static inline unsigned int blk_queue_zone_no(struct request_queue *q, |
| sector_t sector) |
| { |
| if (!blk_queue_is_zoned(q)) |
| return 0; |
| return sector >> ilog2(q->limits.chunk_sectors); |
| } |
| |
| static inline bool blk_queue_zone_is_seq(struct request_queue *q, |
| sector_t sector) |
| { |
| if (!blk_queue_is_zoned(q)) |
| return false; |
| if (!q->conv_zones_bitmap) |
| return true; |
| return !test_bit(blk_queue_zone_no(q, sector), q->conv_zones_bitmap); |
| } |
| |
| static inline void blk_queue_max_open_zones(struct request_queue *q, |
| unsigned int max_open_zones) |
| { |
| q->max_open_zones = max_open_zones; |
| } |
| |
| static inline unsigned int queue_max_open_zones(const struct request_queue *q) |
| { |
| return q->max_open_zones; |
| } |
| |
| static inline void blk_queue_max_active_zones(struct request_queue *q, |
| unsigned int max_active_zones) |
| { |
| q->max_active_zones = max_active_zones; |
| } |
| |
| static inline unsigned int queue_max_active_zones(const struct request_queue *q) |
| { |
| return q->max_active_zones; |
| } |
| #else /* CONFIG_BLK_DEV_ZONED */ |
| static inline unsigned int blk_queue_nr_zones(struct request_queue *q) |
| { |
| return 0; |
| } |
| static inline bool blk_queue_zone_is_seq(struct request_queue *q, |
| sector_t sector) |
| { |
| return false; |
| } |
| static inline unsigned int blk_queue_zone_no(struct request_queue *q, |
| sector_t sector) |
| { |
| return 0; |
| } |
| static inline unsigned int queue_max_open_zones(const struct request_queue *q) |
| { |
| return 0; |
| } |
| static inline unsigned int queue_max_active_zones(const struct request_queue *q) |
| { |
| return 0; |
| } |
| #endif /* CONFIG_BLK_DEV_ZONED */ |
| |
| static inline bool rq_is_sync(struct request *rq) |
| { |
| return op_is_sync(rq->cmd_flags); |
| } |
| |
| static inline bool rq_mergeable(struct request *rq) |
| { |
| if (blk_rq_is_passthrough(rq)) |
| return false; |
| |
| if (req_op(rq) == REQ_OP_FLUSH) |
| return false; |
| |
| if (req_op(rq) == REQ_OP_WRITE_ZEROES) |
| return false; |
| |
| if (req_op(rq) == REQ_OP_ZONE_APPEND) |
| return false; |
| |
| if (rq->cmd_flags & REQ_NOMERGE_FLAGS) |
| return false; |
| if (rq->rq_flags & RQF_NOMERGE_FLAGS) |
| return false; |
| |
| return true; |
| } |
| |
| static inline bool blk_write_same_mergeable(struct bio *a, struct bio *b) |
| { |
| if (bio_page(a) == bio_page(b) && |
| bio_offset(a) == bio_offset(b)) |
| return true; |
| |
| return false; |
| } |
| |
| static inline unsigned int blk_queue_depth(struct request_queue *q) |
| { |
| if (q->queue_depth) |
| return q->queue_depth; |
| |
| return q->nr_requests; |
| } |
| |
| extern unsigned long blk_max_low_pfn, blk_max_pfn; |
| |
| /* |
| * standard bounce addresses: |
| * |
| * BLK_BOUNCE_HIGH : bounce all highmem pages |
| * BLK_BOUNCE_ANY : don't bounce anything |
| * BLK_BOUNCE_ISA : bounce pages above ISA DMA boundary |
| */ |
| |
| #if BITS_PER_LONG == 32 |
| #define BLK_BOUNCE_HIGH ((u64)blk_max_low_pfn << PAGE_SHIFT) |
| #else |
| #define BLK_BOUNCE_HIGH -1ULL |
| #endif |
| #define BLK_BOUNCE_ANY (-1ULL) |
| #define BLK_BOUNCE_ISA (DMA_BIT_MASK(24)) |
| |
| /* |
| * default timeout for SG_IO if none specified |
| */ |
| #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ) |
| #define BLK_MIN_SG_TIMEOUT (7 * HZ) |
| |
| struct rq_map_data { |
| struct page **pages; |
| int page_order; |
| int nr_entries; |
| unsigned long offset; |
| int null_mapped; |
| int from_user; |
| }; |
| |
| struct req_iterator { |
| struct bvec_iter iter; |
| struct bio *bio; |
| }; |
| |
| /* This should not be used directly - use rq_for_each_segment */ |
| #define for_each_bio(_bio) \ |
| for (; _bio; _bio = _bio->bi_next) |
| #define __rq_for_each_bio(_bio, rq) \ |
| if ((rq->bio)) \ |
| for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next) |
| |
| #define rq_for_each_segment(bvl, _rq, _iter) \ |
| __rq_for_each_bio(_iter.bio, _rq) \ |
| bio_for_each_segment(bvl, _iter.bio, _iter.iter) |
| |
| #define rq_for_each_bvec(bvl, _rq, _iter) \ |
| __rq_for_each_bio(_iter.bio, _rq) \ |
| bio_for_each_bvec(bvl, _iter.bio, _iter.iter) |
| |
| #define rq_iter_last(bvec, _iter) \ |
| (_iter.bio->bi_next == NULL && \ |
| bio_iter_last(bvec, _iter.iter)) |
| |
| #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE |
| # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform" |
| #endif |
| #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE |
| extern void rq_flush_dcache_pages(struct request *rq); |
| #else |
| static inline void rq_flush_dcache_pages(struct request *rq) |
| { |
| } |
| #endif |
| |
| extern int blk_register_queue(struct gendisk *disk); |
| extern void blk_unregister_queue(struct gendisk *disk); |
| blk_qc_t submit_bio_noacct(struct bio *bio); |
| extern void blk_rq_init(struct request_queue *q, struct request *rq); |
| extern void blk_put_request(struct request *); |
| extern struct request *blk_get_request(struct request_queue *, unsigned int op, |
| blk_mq_req_flags_t flags); |
| extern int blk_lld_busy(struct request_queue *q); |
| extern int blk_rq_prep_clone(struct request *rq, struct request *rq_src, |
| struct bio_set *bs, gfp_t gfp_mask, |
| int (*bio_ctr)(struct bio *, struct bio *, void *), |
| void *data); |
| extern void blk_rq_unprep_clone(struct request *rq); |
| extern blk_status_t blk_insert_cloned_request(struct request_queue *q, |
| struct request *rq); |
| extern int blk_rq_append_bio(struct request *rq, struct bio **bio); |
| extern void blk_queue_split(struct bio **); |
| extern int scsi_verify_blk_ioctl(struct block_device *, unsigned int); |
| extern int scsi_cmd_blk_ioctl(struct block_device *, fmode_t, |
| unsigned int, void __user *); |
| extern int scsi_cmd_ioctl(struct request_queue *, struct gendisk *, fmode_t, |
| unsigned int, void __user *); |
| extern int sg_scsi_ioctl(struct request_queue *, struct gendisk *, fmode_t, |
| struct scsi_ioctl_command __user *); |
| extern int get_sg_io_hdr(struct sg_io_hdr *hdr, const void __user *argp); |
| extern int put_sg_io_hdr(const struct sg_io_hdr *hdr, void __user *argp); |
| |
| extern int blk_queue_enter(struct request_queue *q, blk_mq_req_flags_t flags); |
| extern void blk_queue_exit(struct request_queue *q); |
| extern void blk_sync_queue(struct request_queue *q); |
| extern int blk_rq_map_user(struct request_queue *, struct request *, |
| struct rq_map_data *, void __user *, unsigned long, |
| gfp_t); |
| extern int blk_rq_unmap_user(struct bio *); |
| extern int blk_rq_map_kern(struct request_queue *, struct request *, void *, unsigned int, gfp_t); |
| extern int blk_rq_map_user_iov(struct request_queue *, struct request *, |
| struct rq_map_data *, const struct iov_iter *, |
| gfp_t); |
| extern void blk_execute_rq(struct gendisk *, struct request *, int); |
| extern void blk_execute_rq_nowait(struct gendisk *, |
| struct request *, int, rq_end_io_fn *); |
| |
| /* Helper to convert REQ_OP_XXX to its string format XXX */ |
| extern const char *blk_op_str(unsigned int op); |
| |
| int blk_status_to_errno(blk_status_t status); |
| blk_status_t errno_to_blk_status(int errno); |
| |
| int blk_poll(struct request_queue *q, blk_qc_t cookie, bool spin); |
| |
| static inline struct request_queue *bdev_get_queue(struct block_device *bdev) |
| { |
| return bdev->bd_disk->queue; /* this is never NULL */ |
| } |
| |
| /* |
| * The basic unit of block I/O is a sector. It is used in a number of contexts |
| * in Linux (blk, bio, genhd). The size of one sector is 512 = 2**9 |
| * bytes. Variables of type sector_t represent an offset or size that is a |
| * multiple of 512 bytes. Hence these two constants. |
| */ |
| #ifndef SECTOR_SHIFT |
| #define SECTOR_SHIFT 9 |
| #endif |
| #ifndef SECTOR_SIZE |
| #define SECTOR_SIZE (1 << SECTOR_SHIFT) |
| #endif |
| |
| /* |
| * blk_rq_pos() : the current sector |
| * blk_rq_bytes() : bytes left in the entire request |
| * blk_rq_cur_bytes() : bytes left in the current segment |
| * blk_rq_err_bytes() : bytes left till the next error boundary |
| * blk_rq_sectors() : sectors left in the entire request |
| * blk_rq_cur_sectors() : sectors left in the current segment |
| * blk_rq_stats_sectors() : sectors of the entire request used for stats |
| */ |
| static inline sector_t blk_rq_pos(const struct request *rq) |
| { |
| return rq->__sector; |
| } |
| |
| static inline unsigned int blk_rq_bytes(const struct request *rq) |
| { |
| return rq->__data_len; |
| } |
| |
| static inline int blk_rq_cur_bytes(const struct request *rq) |
| { |
| return rq->bio ? bio_cur_bytes(rq->bio) : 0; |
| } |
| |
| extern unsigned int blk_rq_err_bytes(const struct request *rq); |
| |
| static inline unsigned int blk_rq_sectors(const struct request *rq) |
| { |
| return blk_rq_bytes(rq) >> SECTOR_SHIFT; |
| } |
| |
| static inline unsigned int blk_rq_cur_sectors(const struct request *rq) |
| { |
| return blk_rq_cur_bytes(rq) >> SECTOR_SHIFT; |
| } |
| |
| static inline unsigned int blk_rq_stats_sectors(const struct request *rq) |
| { |
| return rq->stats_sectors; |
| } |
| |
| #ifdef CONFIG_BLK_DEV_ZONED |
| |
| /* Helper to convert BLK_ZONE_ZONE_XXX to its string format XXX */ |
| const char *blk_zone_cond_str(enum blk_zone_cond zone_cond); |
| |
| static inline unsigned int blk_rq_zone_no(struct request *rq) |
| { |
| return blk_queue_zone_no(rq->q, blk_rq_pos(rq)); |
| } |
| |
| static inline unsigned int blk_rq_zone_is_seq(struct request *rq) |
| { |
| return blk_queue_zone_is_seq(rq->q, blk_rq_pos(rq)); |
| } |
| #endif /* CONFIG_BLK_DEV_ZONED */ |
| |
| /* |
| * Some commands like WRITE SAME have a payload or data transfer size which |
| * is different from the size of the request. Any driver that supports such |
| * commands using the RQF_SPECIAL_PAYLOAD flag needs to use this helper to |
| * calculate the data transfer size. |
| */ |
| static inline unsigned int blk_rq_payload_bytes(struct request *rq) |
| { |
| if (rq->rq_flags & RQF_SPECIAL_PAYLOAD) |
| return rq->special_vec.bv_len; |
| return blk_rq_bytes(rq); |
| } |
| |
| /* |
| * Return the first full biovec in the request. The caller needs to check that |
| * there are any bvecs before calling this helper. |
| */ |
| static inline struct bio_vec req_bvec(struct request *rq) |
| { |
| if (rq->rq_flags & RQF_SPECIAL_PAYLOAD) |
| return rq->special_vec; |
| return mp_bvec_iter_bvec(rq->bio->bi_io_vec, rq->bio->bi_iter); |
| } |
| |
| static inline unsigned int blk_queue_get_max_sectors(struct request_queue *q, |
| int op) |
| { |
| if (unlikely(op == REQ_OP_DISCARD || op == REQ_OP_SECURE_ERASE)) |
| return min(q->limits.max_discard_sectors, |
| UINT_MAX >> SECTOR_SHIFT); |
| |
| if (unlikely(op == REQ_OP_WRITE_SAME)) |
| return q->limits.max_write_same_sectors; |
| |
| if (unlikely(op == REQ_OP_WRITE_ZEROES)) |
| return q->limits.max_write_zeroes_sectors; |
| |
| return q->limits.max_sectors; |
| } |
| |
| /* |
| * Return maximum size of a request at given offset. Only valid for |
| * file system requests. |
| */ |
| static inline unsigned int blk_max_size_offset(struct request_queue *q, |
| sector_t offset, |
| unsigned int chunk_sectors) |
| { |
| if (!chunk_sectors) { |
| if (q->limits.chunk_sectors) |
| chunk_sectors = q->limits.chunk_sectors; |
| else |
| return q->limits.max_sectors; |
| } |
| |
| if (likely(is_power_of_2(chunk_sectors))) |
| chunk_sectors -= offset & (chunk_sectors - 1); |
| else |
| chunk_sectors -= sector_div(offset, chunk_sectors); |
| |
| return min(q->limits.max_sectors, chunk_sectors); |
| } |
| |
| static inline unsigned int blk_rq_get_max_sectors(struct request *rq, |
| sector_t offset) |
| { |
| struct request_queue *q = rq->q; |
| |
| if (blk_rq_is_passthrough(rq)) |
| return q->limits.max_hw_sectors; |
| |
| if (!q->limits.chunk_sectors || |
| req_op(rq) == REQ_OP_DISCARD || |
| req_op(rq) == REQ_OP_SECURE_ERASE) |
| return blk_queue_get_max_sectors(q, req_op(rq)); |
| |
| return min(blk_max_size_offset(q, offset, 0), |
| blk_queue_get_max_sectors(q, req_op(rq))); |
| } |
| |
| static inline unsigned int blk_rq_count_bios(struct request *rq) |
| { |
| unsigned int nr_bios = 0; |
| struct bio *bio; |
| |
| __rq_for_each_bio(bio, rq) |
| nr_bios++; |
| |
| return nr_bios; |
| } |
| |
| void blk_steal_bios(struct bio_list *list, struct request *rq); |
| |
| /* |
| * Request completion related functions. |
| * |
| * blk_update_request() completes given number of bytes and updates |
| * the request without completing it. |
| */ |
| extern bool blk_update_request(struct request *rq, blk_status_t error, |
| unsigned int nr_bytes); |
| |
| extern void blk_abort_request(struct request *); |
| |
| /* |
| * Access functions for manipulating queue properties |
| */ |
| extern void blk_cleanup_queue(struct request_queue *); |
| extern void blk_queue_bounce_limit(struct request_queue *, u64); |
| extern void blk_queue_max_hw_sectors(struct request_queue *, unsigned int); |
| extern void blk_queue_chunk_sectors(struct request_queue *, unsigned int); |
| extern void blk_queue_max_segments(struct request_queue *, unsigned short); |
| extern void blk_queue_max_discard_segments(struct request_queue *, |
| unsigned short); |
| extern void blk_queue_max_segment_size(struct request_queue *, unsigned int); |
| extern void blk_queue_max_discard_sectors(struct request_queue *q, |
| unsigned int max_discard_sectors); |
| extern void blk_queue_max_write_same_sectors(struct request_queue *q, |
| unsigned int max_write_same_sectors); |
| extern void blk_queue_max_write_zeroes_sectors(struct request_queue *q, |
| unsigned int max_write_same_sectors); |
| extern void blk_queue_logical_block_size(struct request_queue *, unsigned int); |
| extern void blk_queue_max_zone_append_sectors(struct request_queue *q, |
| unsigned int max_zone_append_sectors); |
| extern void blk_queue_physical_block_size(struct request_queue *, unsigned int); |
| void blk_queue_zone_write_granularity(struct request_queue *q, |
| unsigned int size); |
| extern void blk_queue_alignment_offset(struct request_queue *q, |
| unsigned int alignment); |
| void blk_queue_update_readahead(struct request_queue *q); |
| extern void blk_limits_io_min(struct queue_limits *limits, unsigned int min); |
| extern void blk_queue_io_min(struct request_queue *q, unsigned int min); |
| extern void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt); |
| extern void blk_queue_io_opt(struct request_queue *q, unsigned int opt); |
| extern void blk_set_queue_depth(struct request_queue *q, unsigned int depth); |
| extern void blk_set_default_limits(struct queue_limits *lim); |
| extern void blk_set_stacking_limits(struct queue_limits *lim); |
| extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b, |
| sector_t offset); |
| extern void disk_stack_limits(struct gendisk *disk, struct block_device *bdev, |
| sector_t offset); |
| extern void blk_queue_update_dma_pad(struct request_queue *, unsigned int); |
| extern void blk_queue_segment_boundary(struct request_queue *, unsigned long); |
| extern void blk_queue_virt_boundary(struct request_queue *, unsigned long); |
| extern void blk_queue_dma_alignment(struct request_queue *, int); |
| extern void blk_queue_update_dma_alignment(struct request_queue *, int); |
| extern void blk_queue_rq_timeout(struct request_queue *, unsigned int); |
| extern void blk_queue_write_cache(struct request_queue *q, bool enabled, bool fua); |
| extern void blk_queue_required_elevator_features(struct request_queue *q, |
| unsigned int features); |
| extern bool blk_queue_can_use_dma_map_merging(struct request_queue *q, |
| struct device *dev); |
| |
| /* |
| * Number of physical segments as sent to the device. |
| * |
| * Normally this is the number of discontiguous data segments sent by the |
| * submitter. But for data-less command like discard we might have no |
| * actual data segments submitted, but the driver might have to add it's |
| * own special payload. In that case we still return 1 here so that this |
| * special payload will be mapped. |
| */ |
| static inline unsigned short blk_rq_nr_phys_segments(struct request *rq) |
| { |
| if (rq->rq_flags & RQF_SPECIAL_PAYLOAD) |
| return 1; |
| return rq->nr_phys_segments; |
| } |
| |
| /* |
| * Number of discard segments (or ranges) the driver needs to fill in. |
| * Each discard bio merged into a request is counted as one segment. |
| */ |
| static inline unsigned short blk_rq_nr_discard_segments(struct request *rq) |
| { |
| return max_t(unsigned short, rq->nr_phys_segments, 1); |
| } |
| |
| int __blk_rq_map_sg(struct request_queue *q, struct request *rq, |
| struct scatterlist *sglist, struct scatterlist **last_sg); |
| static inline int blk_rq_map_sg(struct request_queue *q, struct request *rq, |
| struct scatterlist *sglist) |
| { |
| struct scatterlist *last_sg = NULL; |
| |
| return __blk_rq_map_sg(q, rq, sglist, &last_sg); |
| } |
| extern void blk_dump_rq_flags(struct request *, char *); |
| |
| bool __must_check blk_get_queue(struct request_queue *); |
| struct request_queue *blk_alloc_queue(int node_id); |
| extern void blk_put_queue(struct request_queue *); |
| extern void blk_set_queue_dying(struct request_queue *); |
| |
| #ifdef CONFIG_BLOCK |
| /* |
| * blk_plug permits building a queue of related requests by holding the I/O |
| * fragments for a short period. This allows merging of sequential requests |
| * into single larger request. As the requests are moved from a per-task list to |
| * the device's request_queue in a batch, this results in improved scalability |
| * as the lock contention for request_queue lock is reduced. |
| * |
| * It is ok not to disable preemption when adding the request to the plug list |
| * or when attempting a merge, because blk_schedule_flush_list() will only flush |
| * the plug list when the task sleeps by itself. For details, please see |
| * schedule() where blk_schedule_flush_plug() is called. |
| */ |
| struct blk_plug { |
| struct list_head mq_list; /* blk-mq requests */ |
| struct list_head cb_list; /* md requires an unplug callback */ |
| unsigned short rq_count; |
| bool multiple_queues; |
| bool nowait; |
| }; |
| #define BLK_MAX_REQUEST_COUNT 16 |
| #define BLK_PLUG_FLUSH_SIZE (128 * 1024) |
| |
| struct blk_plug_cb; |
| typedef void (*blk_plug_cb_fn)(struct blk_plug_cb *, bool); |
| struct blk_plug_cb { |
| struct list_head list; |
| blk_plug_cb_fn callback; |
| void *data; |
| }; |
| extern struct blk_plug_cb *blk_check_plugged(blk_plug_cb_fn unplug, |
| void *data, int size); |
| extern void blk_start_plug(struct blk_plug *); |
| extern void blk_finish_plug(struct blk_plug *); |
| extern void blk_flush_plug_list(struct blk_plug *, bool); |
| |
| static inline void blk_flush_plug(struct task_struct *tsk) |
| { |
| struct blk_plug *plug = tsk->plug; |
| |
| if (plug) |
| blk_flush_plug_list(plug, false); |
| } |
| |
| static inline void blk_schedule_flush_plug(struct task_struct *tsk) |
| { |
| struct blk_plug *plug = tsk->plug; |
| |
| if (plug) |
| blk_flush_plug_list(plug, true); |
| } |
| |
| static inline bool blk_needs_flush_plug(struct task_struct *tsk) |
| { |
| struct blk_plug *plug = tsk->plug; |
| |
| return plug && |
| (!list_empty(&plug->mq_list) || |
| !list_empty(&plug->cb_list)); |
| } |
| |
| int blkdev_issue_flush(struct block_device *bdev); |
| long nr_blockdev_pages(void); |
| #else /* CONFIG_BLOCK */ |
| struct blk_plug { |
| }; |
| |
| static inline void blk_start_plug(struct blk_plug *plug) |
| { |
| } |
| |
| static inline void blk_finish_plug(struct blk_plug *plug) |
| { |
| } |
| |
| static inline void blk_flush_plug(struct task_struct *task) |
| { |
| } |
| |
| static inline void blk_schedule_flush_plug(struct task_struct *task) |
| { |
| } |
| |
| |
| static inline bool blk_needs_flush_plug(struct task_struct *tsk) |
| { |
| return false; |
| } |
| |
| static inline int blkdev_issue_flush(struct block_device *bdev) |
| { |
| return 0; |
| } |
| |
| static inline long nr_blockdev_pages(void) |
| { |
| return 0; |
| } |
| #endif /* CONFIG_BLOCK */ |
| |
| extern void blk_io_schedule(void); |
| |
| extern int blkdev_issue_write_same(struct block_device *bdev, sector_t sector, |
| sector_t nr_sects, gfp_t gfp_mask, struct page *page); |
| |
| #define BLKDEV_DISCARD_SECURE (1 << 0) /* issue a secure erase */ |
| |
| extern int blkdev_issue_discard(struct block_device *bdev, sector_t sector, |
| sector_t nr_sects, gfp_t gfp_mask, unsigned long flags); |
| extern int __blkdev_issue_discard(struct block_device *bdev, sector_t sector, |
| sector_t nr_sects, gfp_t gfp_mask, int flags, |
| struct bio **biop); |
| |
| #define BLKDEV_ZERO_NOUNMAP (1 << 0) /* do not free blocks */ |
| #define BLKDEV_ZERO_NOFALLBACK (1 << 1) /* don't write explicit zeroes */ |
| |
| extern int __blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, |
| sector_t nr_sects, gfp_t gfp_mask, struct bio **biop, |
| unsigned flags); |
| extern int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, |
| sector_t nr_sects, gfp_t gfp_mask, unsigned flags); |
| |
| static inline int sb_issue_discard(struct super_block *sb, sector_t block, |
| sector_t nr_blocks, gfp_t gfp_mask, unsigned long flags) |
| { |
| return blkdev_issue_discard(sb->s_bdev, |
| block << (sb->s_blocksize_bits - |
| SECTOR_SHIFT), |
| nr_blocks << (sb->s_blocksize_bits - |
| SECTOR_SHIFT), |
| gfp_mask, flags); |
| } |
| static inline int sb_issue_zeroout(struct super_block *sb, sector_t block, |
| sector_t nr_blocks, gfp_t gfp_mask) |
| { |
| return blkdev_issue_zeroout(sb->s_bdev, |
| block << (sb->s_blocksize_bits - |
| SECTOR_SHIFT), |
| nr_blocks << (sb->s_blocksize_bits - |
| SECTOR_SHIFT), |
| gfp_mask, 0); |
| } |
| |
| extern int blk_verify_command(unsigned char *cmd, fmode_t mode); |
| |
| static inline bool bdev_is_partition(struct block_device *bdev) |
| { |
| return bdev->bd_partno; |
| } |
| |
| enum blk_default_limits { |
| BLK_MAX_SEGMENTS = 128, |
| BLK_SAFE_MAX_SECTORS = 255, |
| BLK_DEF_MAX_SECTORS = 2560, |
| BLK_MAX_SEGMENT_SIZE = 65536, |
| BLK_SEG_BOUNDARY_MASK = 0xFFFFFFFFUL, |
| }; |
| |
| static inline unsigned long queue_segment_boundary(const struct request_queue *q) |
| { |
| return q->limits.seg_boundary_mask; |
| } |
| |
| static inline unsigned long queue_virt_boundary(const struct request_queue *q) |
| { |
| return q->limits.virt_boundary_mask; |
| } |
| |
| static inline unsigned int queue_max_sectors(const struct request_queue *q) |
| { |
| return q->limits.max_sectors; |
| } |
| |
| static inline unsigned int queue_max_hw_sectors(const struct request_queue *q) |
| { |
| return q->limits.max_hw_sectors; |
| } |
| |
| static inline unsigned short queue_max_segments(const struct request_queue *q) |
| { |
| return q->limits.max_segments; |
| } |
| |
| static inline unsigned short queue_max_discard_segments(const struct request_queue *q) |
| { |
| return q->limits.max_discard_segments; |
| } |
| |
| static inline unsigned int queue_max_segment_size(const struct request_queue *q) |
| { |
| return q->limits.max_segment_size; |
| } |
| |
| static inline unsigned int queue_max_zone_append_sectors(const struct request_queue *q) |
| { |
| |
| const struct queue_limits *l = &q->limits; |
| |
| return min(l->max_zone_append_sectors, l->max_sectors); |
| } |
| |
| static inline unsigned queue_logical_block_size(const struct request_queue *q) |
| { |
| int retval = 512; |
| |
| if (q && q->limits.logical_block_size) |
| retval = q->limits.logical_block_size; |
| |
| return retval; |
| } |
| |
| static inline unsigned int bdev_logical_block_size(struct block_device *bdev) |
| { |
| return queue_logical_block_size(bdev_get_queue(bdev)); |
| } |
| |
| static inline unsigned int queue_physical_block_size(const struct request_queue *q) |
| { |
| return q->limits.physical_block_size; |
| } |
| |
| static inline unsigned int bdev_physical_block_size(struct block_device *bdev) |
| { |
| return queue_physical_block_size(bdev_get_queue(bdev)); |
| } |
| |
| static inline unsigned int queue_io_min(const struct request_queue *q) |
| { |
| return q->limits.io_min; |
| } |
| |
| static inline int bdev_io_min(struct block_device *bdev) |
| { |
| return queue_io_min(bdev_get_queue(bdev)); |
| } |
| |
| static inline unsigned int queue_io_opt(const struct request_queue *q) |
| { |
| return q->limits.io_opt; |
| } |
| |
| static inline int bdev_io_opt(struct block_device *bdev) |
| { |
| return queue_io_opt(bdev_get_queue(bdev)); |
| } |
| |
| static inline unsigned int |
| queue_zone_write_granularity(const struct request_queue *q) |
| { |
| return q->limits.zone_write_granularity; |
| } |
| |
| static inline unsigned int |
| bdev_zone_write_granularity(struct block_device *bdev) |
| { |
| return queue_zone_write_granularity(bdev_get_queue(bdev)); |
| } |
| |
| static inline int queue_alignment_offset(const struct request_queue *q) |
| { |
| if (q->limits.misaligned) |
| return -1; |
| |
| return q->limits.alignment_offset; |
| } |
| |
| static inline int queue_limit_alignment_offset(struct queue_limits *lim, sector_t sector) |
| { |
| unsigned int granularity = max(lim->physical_block_size, lim->io_min); |
| unsigned int alignment = sector_div(sector, granularity >> SECTOR_SHIFT) |
| << SECTOR_SHIFT; |
| |
| return (granularity + lim->alignment_offset - alignment) % granularity; |
| } |
| |
| static inline int bdev_alignment_offset(struct block_device *bdev) |
| { |
| struct request_queue *q = bdev_get_queue(bdev); |
| |
| if (q->limits.misaligned) |
| return -1; |
| if (bdev_is_partition(bdev)) |
| return queue_limit_alignment_offset(&q->limits, |
| bdev->bd_start_sect); |
| return q->limits.alignment_offset; |
| } |
| |
| static inline int queue_discard_alignment(const struct request_queue *q) |
| { |
| if (q->limits.discard_misaligned) |
| return -1; |
| |
| return q->limits.discard_alignment; |
| } |
| |
| static inline int queue_limit_discard_alignment(struct queue_limits *lim, sector_t sector) |
| { |
| unsigned int alignment, granularity, offset; |
| |
| if (!lim->max_discard_sectors) |
| return 0; |
| |
| /* Why are these in bytes, not sectors? */ |
| alignment = lim->discard_alignment >> SECTOR_SHIFT; |
| granularity = lim->discard_granularity >> SECTOR_SHIFT; |
| if (!granularity) |
| return 0; |
| |
| /* Offset of the partition start in 'granularity' sectors */ |
| offset = sector_div(sector, granularity); |
| |
| /* And why do we do this modulus *again* in blkdev_issue_discard()? */ |
| offset = (granularity + alignment - offset) % granularity; |
| |
| /* Turn it back into bytes, gaah */ |
| return offset << SECTOR_SHIFT; |
| } |
| |
| static inline int bdev_discard_alignment(struct block_device *bdev) |
| { |
| struct request_queue *q = bdev_get_queue(bdev); |
| |
| if (bdev_is_partition(bdev)) |
| return queue_limit_discard_alignment(&q->limits, |
| bdev->bd_start_sect); |
| return q->limits.discard_alignment; |
| } |
| |
| static inline unsigned int bdev_write_same(struct block_device *bdev) |
| { |
| struct request_queue *q = bdev_get_queue(bdev); |
| |
| if (q) |
| return q->limits.max_write_same_sectors; |
| |
| return 0; |
| } |
| |
| static inline unsigned int bdev_write_zeroes_sectors(struct block_device *bdev) |
| { |
| struct request_queue *q = bdev_get_queue(bdev); |
| |
| if (q) |
| return q->limits.max_write_zeroes_sectors; |
| |
| return 0; |
| } |
| |
| static inline enum blk_zoned_model bdev_zoned_model(struct block_device *bdev) |
| { |
| struct request_queue *q = bdev_get_queue(bdev); |
| |
| if (q) |
| return blk_queue_zoned_model(q); |
| |
| return BLK_ZONED_NONE; |
| } |
| |
| static inline bool bdev_is_zoned(struct block_device *bdev) |
| { |
| struct request_queue *q = bdev_get_queue(bdev); |
| |
| if (q) |
| return blk_queue_is_zoned(q); |
| |
| return false; |
| } |
| |
| static inline sector_t bdev_zone_sectors(struct block_device *bdev) |
| { |
| struct request_queue *q = bdev_get_queue(bdev); |
| |
| if (q) |
| return blk_queue_zone_sectors(q); |
| return 0; |
| } |
| |
| static inline unsigned int bdev_max_open_zones(struct block_device *bdev) |
| { |
| struct request_queue *q = bdev_get_queue(bdev); |
| |
| if (q) |
| return queue_max_open_zones(q); |
| return 0; |
| } |
| |
| static inline unsigned int bdev_max_active_zones(struct block_device *bdev) |
| { |
| struct request_queue *q = bdev_get_queue(bdev); |
| |
| if (q) |
| return queue_max_active_zones(q); |
| return 0; |
| } |
| |
| static inline int queue_dma_alignment(const struct request_queue *q) |
| { |
| return q ? q->dma_alignment : 511; |
| } |
| |
| static inline int blk_rq_aligned(struct request_queue *q, unsigned long addr, |
| unsigned int len) |
| { |
| unsigned int alignment = queue_dma_alignment(q) | q->dma_pad_mask; |
| return !(addr & alignment) && !(len & alignment); |
| } |
| |
| /* assumes size > 256 */ |
| static inline unsigned int blksize_bits(unsigned int size) |
| { |
| unsigned int bits = 8; |
| do { |
| bits++; |
| size >>= 1; |
| } while (size > 256); |
| return bits; |
| } |
| |
| static inline unsigned int block_size(struct block_device *bdev) |
| { |
| return 1 << bdev->bd_inode->i_blkbits; |
| } |
| |
| int kblockd_schedule_work(struct work_struct *work); |
| int kblockd_mod_delayed_work_on(int cpu, struct delayed_work *dwork, unsigned long delay); |
| |
| #define MODULE_ALIAS_BLOCKDEV(major,minor) \ |
| MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor)) |
| #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \ |
| MODULE_ALIAS("block-major-" __stringify(major) "-*") |
| |
| #if defined(CONFIG_BLK_DEV_INTEGRITY) |
| |
| enum blk_integrity_flags { |
| BLK_INTEGRITY_VERIFY = 1 << 0, |
| BLK_INTEGRITY_GENERATE = 1 << 1, |
| BLK_INTEGRITY_DEVICE_CAPABLE = 1 << 2, |
| BLK_INTEGRITY_IP_CHECKSUM = 1 << 3, |
| }; |
| |
| struct blk_integrity_iter { |
| void *prot_buf; |
| void *data_buf; |
| sector_t seed; |
| unsigned int data_size; |
| unsigned short interval; |
| const char *disk_name; |
| }; |
| |
| typedef blk_status_t (integrity_processing_fn) (struct blk_integrity_iter *); |
| typedef void (integrity_prepare_fn) (struct request *); |
| typedef void (integrity_complete_fn) (struct request *, unsigned int); |
| |
| struct blk_integrity_profile { |
| integrity_processing_fn *generate_fn; |
| integrity_processing_fn *verify_fn; |
| integrity_prepare_fn *prepare_fn; |
| integrity_complete_fn *complete_fn; |
| const char *name; |
| }; |
| |
| extern void blk_integrity_register(struct gendisk *, struct blk_integrity *); |
| extern void blk_integrity_unregister(struct gendisk *); |
| extern int blk_integrity_compare(struct gendisk *, struct gendisk *); |
| extern int blk_rq_map_integrity_sg(struct request_queue *, struct bio *, |
| struct scatterlist *); |
| extern int blk_rq_count_integrity_sg(struct request_queue *, struct bio *); |
| |
| static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk) |
| { |
| struct blk_integrity *bi = &disk->queue->integrity; |
| |
| if (!bi->profile) |
| return NULL; |
| |
| return bi; |
| } |
| |
| static inline |
| struct blk_integrity *bdev_get_integrity(struct block_device *bdev) |
| { |
| return blk_get_integrity(bdev->bd_disk); |
| } |
| |
| static inline bool |
| blk_integrity_queue_supports_integrity(struct request_queue *q) |
| { |
| return q->integrity.profile; |
| } |
| |
| static inline bool blk_integrity_rq(struct request *rq) |
| { |
| return rq->cmd_flags & REQ_INTEGRITY; |
| } |
| |
| static inline void blk_queue_max_integrity_segments(struct request_queue *q, |
| unsigned int segs) |
| { |
| q->limits.max_integrity_segments = segs; |
| } |
| |
| static inline unsigned short |
| queue_max_integrity_segments(const struct request_queue *q) |
| { |
| return q->limits.max_integrity_segments; |
| } |
| |
| /** |
| * bio_integrity_intervals - Return number of integrity intervals for a bio |
| * @bi: blk_integrity profile for device |
| * @sectors: Size of the bio in 512-byte sectors |
| * |
| * Description: The block layer calculates everything in 512 byte |
| * sectors but integrity metadata is done in terms of the data integrity |
| * interval size of the storage device. Convert the block layer sectors |
| * to the appropriate number of integrity intervals. |
| */ |
| static inline unsigned int bio_integrity_intervals(struct blk_integrity *bi, |
| unsigned int sectors) |
| { |
| return sectors >> (bi->interval_exp - 9); |
| } |
| |
| static inline unsigned int bio_integrity_bytes(struct blk_integrity *bi, |
| unsigned int sectors) |
| { |
| return bio_integrity_intervals(bi, sectors) * bi->tuple_size; |
| } |
| |
| /* |
| * Return the first bvec that contains integrity data. Only drivers that are |
| * limited to a single integrity segment should use this helper. |
| */ |
| static inline struct bio_vec *rq_integrity_vec(struct request *rq) |
| { |
| if (WARN_ON_ONCE(queue_max_integrity_segments(rq->q) > 1)) |
| return NULL; |
| return rq->bio->bi_integrity->bip_vec; |
| } |
| |
| #else /* CONFIG_BLK_DEV_INTEGRITY */ |
| |
| struct bio; |
| struct block_device; |
| struct gendisk; |
| struct blk_integrity; |
| |
| static inline int blk_integrity_rq(struct request *rq) |
| { |
| return 0; |
| } |
| static inline int blk_rq_count_integrity_sg(struct request_queue *q, |
| struct bio *b) |
| { |
| return 0; |
| } |
| static inline int blk_rq_map_integrity_sg(struct request_queue *q, |
| struct bio *b, |
| struct scatterlist *s) |
| { |
| return 0; |
| } |
| static inline struct blk_integrity *bdev_get_integrity(struct block_device *b) |
| { |
| return NULL; |
| } |
| static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk) |
| { |
| return NULL; |
| } |
| static inline bool |
| blk_integrity_queue_supports_integrity(struct request_queue *q) |
| { |
| return false; |
| } |
| static inline int blk_integrity_compare(struct gendisk *a, struct gendisk *b) |
| { |
| return 0; |
| } |
| static inline void blk_integrity_register(struct gendisk *d, |
| struct blk_integrity *b) |
| { |
| } |
| static inline void blk_integrity_unregister(struct gendisk *d) |
| { |
| } |
| static inline void blk_queue_max_integrity_segments(struct request_queue *q, |
| unsigned int segs) |
| { |
| } |
| static inline unsigned short queue_max_integrity_segments(const struct request_queue *q) |
| { |
| return 0; |
| } |
| |
| static inline unsigned int bio_integrity_intervals(struct blk_integrity *bi, |
| unsigned int sectors) |
| { |
| return 0; |
| } |
| |
| static inline unsigned int bio_integrity_bytes(struct blk_integrity *bi, |
| unsigned int sectors) |
| { |
| return 0; |
| } |
| |
| static inline struct bio_vec *rq_integrity_vec(struct request *rq) |
| { |
| return NULL; |
| } |
| |
| #endif /* CONFIG_BLK_DEV_INTEGRITY */ |
| |
| #ifdef CONFIG_BLK_INLINE_ENCRYPTION |
| |
| bool blk_ksm_register(struct blk_keyslot_manager *ksm, struct request_queue *q); |
| |
| void blk_ksm_unregister(struct request_queue *q); |
| |
| #else /* CONFIG_BLK_INLINE_ENCRYPTION */ |
| |
| static inline bool blk_ksm_register(struct blk_keyslot_manager *ksm, |
| struct request_queue *q) |
| { |
| return true; |
| } |
| |
| static inline void blk_ksm_unregister(struct request_queue *q) { } |
| |
| #endif /* CONFIG_BLK_INLINE_ENCRYPTION */ |
| |
| |
| struct block_device_operations { |
| blk_qc_t (*submit_bio) (struct bio *bio); |
| int (*open) (struct block_device *, fmode_t); |
| void (*release) (struct gendisk *, fmode_t); |
| int (*rw_page)(struct block_device *, sector_t, struct page *, unsigned int); |
| int (*ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); |
| int (*compat_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); |
| unsigned int (*check_events) (struct gendisk *disk, |
| unsigned int clearing); |
| void (*unlock_native_capacity) (struct gendisk *); |
| int (*revalidate_disk) (struct gendisk *); |
| int (*getgeo)(struct block_device *, struct hd_geometry *); |
| int (*set_read_only)(struct block_device *bdev, bool ro); |
| /* this callback is with swap_lock and sometimes page table lock held */ |
| void (*swap_slot_free_notify) (struct block_device *, unsigned long); |
| int (*report_zones)(struct gendisk *, sector_t sector, |
| unsigned int nr_zones, report_zones_cb cb, void *data); |
| char *(*devnode)(struct gendisk *disk, umode_t *mode); |
| struct module *owner; |
| const struct pr_ops *pr_ops; |
| }; |
| |
| #ifdef CONFIG_COMPAT |
| extern int blkdev_compat_ptr_ioctl(struct block_device *, fmode_t, |
| unsigned int, unsigned long); |
| #else |
| #define blkdev_compat_ptr_ioctl NULL |
| #endif |
| |
| extern int bdev_read_page(struct block_device *, sector_t, struct page *); |
| extern int bdev_write_page(struct block_device *, sector_t, struct page *, |
| struct writeback_control *); |
| |
| #ifdef CONFIG_BLK_DEV_ZONED |
| bool blk_req_needs_zone_write_lock(struct request *rq); |
| bool blk_req_zone_write_trylock(struct request *rq); |
| void __blk_req_zone_write_lock(struct request *rq); |
| void __blk_req_zone_write_unlock(struct request *rq); |
| |
| static inline void blk_req_zone_write_lock(struct request *rq) |
| { |
| if (blk_req_needs_zone_write_lock(rq)) |
| __blk_req_zone_write_lock(rq); |
| } |
| |
| static inline void blk_req_zone_write_unlock(struct request *rq) |
| { |
| if (rq->rq_flags & RQF_ZONE_WRITE_LOCKED) |
| __blk_req_zone_write_unlock(rq); |
| } |
| |
| static inline bool blk_req_zone_is_write_locked(struct request *rq) |
| { |
| return rq->q->seq_zones_wlock && |
| test_bit(blk_rq_zone_no(rq), rq->q->seq_zones_wlock); |
| } |
| |
| static inline bool blk_req_can_dispatch_to_zone(struct request *rq) |
| { |
| if (!blk_req_needs_zone_write_lock(rq)) |
| return true; |
| return !blk_req_zone_is_write_locked(rq); |
| } |
| #else |
| static inline bool blk_req_needs_zone_write_lock(struct request *rq) |
| { |
| return false; |
| } |
| |
| static inline void blk_req_zone_write_lock(struct request *rq) |
| { |
| } |
| |
| static inline void blk_req_zone_write_unlock(struct request *rq) |
| { |
| } |
| static inline bool blk_req_zone_is_write_locked(struct request *rq) |
| { |
| return false; |
| } |
| |
| static inline bool blk_req_can_dispatch_to_zone(struct request *rq) |
| { |
| return true; |
| } |
| #endif /* CONFIG_BLK_DEV_ZONED */ |
| |
| static inline void blk_wake_io_task(struct task_struct *waiter) |
| { |
| /* |
| * If we're polling, the task itself is doing the completions. For |
| * that case, we don't need to signal a wakeup, it's enough to just |
| * mark us as RUNNING. |
| */ |
| if (waiter == current) |
| __set_current_state(TASK_RUNNING); |
| else |
| wake_up_process(waiter); |
| } |
| |
| unsigned long disk_start_io_acct(struct gendisk *disk, unsigned int sectors, |
| unsigned int op); |
| void disk_end_io_acct(struct gendisk *disk, unsigned int op, |
| unsigned long start_time); |
| |
| unsigned long bio_start_io_acct(struct bio *bio); |
| void bio_end_io_acct_remapped(struct bio *bio, unsigned long start_time, |
| struct block_device *orig_bdev); |
| |
| /** |
| * bio_end_io_acct - end I/O accounting for bio based drivers |
| * @bio: bio to end account for |
| * @start: start time returned by bio_start_io_acct() |
| */ |
| static inline void bio_end_io_acct(struct bio *bio, unsigned long start_time) |
| { |
| return bio_end_io_acct_remapped(bio, start_time, bio->bi_bdev); |
| } |
| |
| int bdev_read_only(struct block_device *bdev); |
| int set_blocksize(struct block_device *bdev, int size); |
| |
| const char *bdevname(struct block_device *bdev, char *buffer); |
| int lookup_bdev(const char *pathname, dev_t *dev); |
| |
| void blkdev_show(struct seq_file *seqf, off_t offset); |
| |
| #define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */ |
| #define BDEVT_SIZE 10 /* Largest string for MAJ:MIN for blkdev */ |
| #ifdef CONFIG_BLOCK |
| #define BLKDEV_MAJOR_MAX 512 |
| #else |
| #define BLKDEV_MAJOR_MAX 0 |
| #endif |
| |
| struct block_device *blkdev_get_by_path(const char *path, fmode_t mode, |
| void *holder); |
| struct block_device *blkdev_get_by_dev(dev_t dev, fmode_t mode, void *holder); |
| int bd_prepare_to_claim(struct block_device *bdev, void *holder); |
| void bd_abort_claiming(struct block_device *bdev, void *holder); |
| void blkdev_put(struct block_device *bdev, fmode_t mode); |
| |
| /* just for blk-cgroup, don't use elsewhere */ |
| struct block_device *blkdev_get_no_open(dev_t dev); |
| void blkdev_put_no_open(struct block_device *bdev); |
| |
| struct block_device *bdev_alloc(struct gendisk *disk, u8 partno); |
| void bdev_add(struct block_device *bdev, dev_t dev); |
| struct block_device *I_BDEV(struct inode *inode); |
| struct block_device *bdgrab(struct block_device *bdev); |
| void bdput(struct block_device *); |
| int truncate_bdev_range(struct block_device *bdev, fmode_t mode, loff_t lstart, |
| loff_t lend); |
| |
| #ifdef CONFIG_BLOCK |
| void invalidate_bdev(struct block_device *bdev); |
| int sync_blockdev(struct block_device *bdev); |
| #else |
| static inline void invalidate_bdev(struct block_device *bdev) |
| { |
| } |
| static inline int sync_blockdev(struct block_device *bdev) |
| { |
| return 0; |
| } |
| #endif |
| int fsync_bdev(struct block_device *bdev); |
| |
| int freeze_bdev(struct block_device *bdev); |
| int thaw_bdev(struct block_device *bdev); |
| |
| #endif /* _LINUX_BLKDEV_H */ |