Contributors: 68
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Christoph Hellwig |
1186 |
36.20% |
83 |
30.29% |
| Jens Axboe |
874 |
26.68% |
32 |
11.68% |
| Damien Le Moal |
181 |
5.53% |
10 |
3.65% |
| Tejun Heo |
94 |
2.87% |
17 |
6.20% |
| Martin K. Petersen |
93 |
2.84% |
8 |
2.92% |
| Ming Lei |
83 |
2.53% |
11 |
4.01% |
| Keith Busch |
76 |
2.32% |
9 |
3.28% |
| Uday Shankar |
38 |
1.16% |
1 |
0.36% |
| Sagi Grimberg |
38 |
1.16% |
1 |
0.36% |
| Christian Brauner |
34 |
1.04% |
4 |
1.46% |
| Al Viro |
32 |
0.98% |
7 |
2.55% |
| Linus Torvalds |
30 |
0.92% |
4 |
1.46% |
| Dan J Williams |
28 |
0.85% |
2 |
0.73% |
| Omar Sandoval |
28 |
0.85% |
3 |
1.09% |
| Linus Torvalds (pre-git) |
27 |
0.82% |
4 |
1.46% |
| John Garry |
26 |
0.79% |
2 |
0.73% |
| Kay Sievers |
26 |
0.79% |
2 |
0.73% |
| Patrick Mochel |
23 |
0.70% |
1 |
0.36% |
| David Howells |
21 |
0.64% |
2 |
0.73% |
| Bart Van Assche |
20 |
0.61% |
4 |
1.46% |
| Baolin Wang |
19 |
0.58% |
3 |
1.09% |
| Neil Brown |
15 |
0.46% |
2 |
0.73% |
| Jan Kara |
14 |
0.43% |
3 |
1.09% |
| Chaitanya Kulkarni |
14 |
0.43% |
2 |
0.73% |
| Shaohua Li |
14 |
0.43% |
3 |
1.09% |
| Mike Sullivan |
12 |
0.37% |
1 |
0.36% |
| Fabio Massimo Di Nitto |
12 |
0.37% |
1 |
0.36% |
| Alexander Potapenko |
11 |
0.34% |
1 |
0.36% |
| Yufen Yu |
11 |
0.34% |
1 |
0.36% |
| Josef Bacik |
10 |
0.31% |
2 |
0.73% |
| Jianchao Wang |
10 |
0.31% |
2 |
0.73% |
| Max Gurtovoy |
10 |
0.31% |
2 |
0.73% |
| Jinyoung Choi |
10 |
0.31% |
1 |
0.36% |
| Greg Edwards |
10 |
0.31% |
1 |
0.36% |
| Pavel Begunkov |
10 |
0.31% |
1 |
0.36% |
| Andrew Morton |
9 |
0.27% |
2 |
0.73% |
| Patrick Mansfield |
9 |
0.27% |
1 |
0.36% |
| Justin Tee |
9 |
0.27% |
1 |
0.36% |
| Stephen Rothwell |
8 |
0.24% |
1 |
0.36% |
| Kent Overstreet |
8 |
0.24% |
4 |
1.46% |
| Song Liu |
7 |
0.21% |
1 |
0.36% |
| Nikanth Karthikesan |
7 |
0.21% |
1 |
0.36% |
| Adrian Hunter |
7 |
0.21% |
1 |
0.36% |
| Satya Tangirala |
6 |
0.18% |
1 |
0.36% |
| yu kuai |
5 |
0.15% |
1 |
0.36% |
| Thomas Weißschuh |
5 |
0.15% |
1 |
0.36% |
| Dmitriy Monakhov |
5 |
0.15% |
2 |
0.73% |
| Arnaldo Carvalho de Melo |
5 |
0.15% |
1 |
0.36% |
| Jerome Marchand |
5 |
0.15% |
2 |
0.73% |
| Logan Gunthorpe |
5 |
0.15% |
2 |
0.73% |
| Luis R. Rodriguez |
4 |
0.12% |
2 |
0.73% |
| Jianpeng Ma |
3 |
0.09% |
1 |
0.36% |
| Hannes Reinecke |
3 |
0.09% |
1 |
0.36% |
| Jeremy Fitzhardinge |
3 |
0.09% |
1 |
0.36% |
| Clark Williams |
3 |
0.09% |
1 |
0.36% |
| Johannes Thumshirn |
3 |
0.09% |
1 |
0.36% |
| Akinobu Mita |
3 |
0.09% |
1 |
0.36% |
| Boaz Harrosh |
2 |
0.06% |
1 |
0.36% |
| Michael Callahan |
2 |
0.06% |
1 |
0.36% |
| Chengming Zhou |
2 |
0.06% |
1 |
0.36% |
| Michael Christie |
1 |
0.03% |
1 |
0.36% |
| Milan Broz |
1 |
0.03% |
1 |
0.36% |
| Chengguang Xu |
1 |
0.03% |
1 |
0.36% |
| Mikulas Patocka |
1 |
0.03% |
1 |
0.36% |
| Greg Kroah-Hartman |
1 |
0.03% |
1 |
0.36% |
| Ritesh Harjani |
1 |
0.03% |
1 |
0.36% |
| Adrian Bunk |
1 |
0.03% |
1 |
0.36% |
| Mike Rapoport |
1 |
0.03% |
1 |
0.36% |
| Total |
3276 |
|
274 |
|
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef BLK_INTERNAL_H
#define BLK_INTERNAL_H
#include <linux/bio-integrity.h>
#include <linux/blk-crypto.h>
#include <linux/memblock.h> /* for max_pfn/max_low_pfn */
#include <linux/sched/sysctl.h>
#include <linux/timekeeping.h>
#include <xen/xen.h>
#include "blk-crypto-internal.h"
struct elevator_type;
/* Max future timer expiry for timeouts */
#define BLK_MAX_TIMEOUT (5 * HZ)
extern struct dentry *blk_debugfs_root;
struct blk_flush_queue {
spinlock_t mq_flush_lock;
unsigned int flush_pending_idx:1;
unsigned int flush_running_idx:1;
blk_status_t rq_status;
unsigned long flush_pending_since;
struct list_head flush_queue[2];
unsigned long flush_data_in_flight;
struct request *flush_rq;
};
bool is_flush_rq(struct request *req);
struct blk_flush_queue *blk_alloc_flush_queue(int node, int cmd_size,
gfp_t flags);
void blk_free_flush_queue(struct blk_flush_queue *q);
void blk_freeze_queue(struct request_queue *q);
void __blk_mq_unfreeze_queue(struct request_queue *q, bool force_atomic);
void blk_queue_start_drain(struct request_queue *q);
int __bio_queue_enter(struct request_queue *q, struct bio *bio);
void submit_bio_noacct_nocheck(struct bio *bio);
void bio_await_chain(struct bio *bio);
static inline bool blk_try_enter_queue(struct request_queue *q, bool pm)
{
rcu_read_lock();
if (!percpu_ref_tryget_live_rcu(&q->q_usage_counter))
goto fail;
/*
* The code that increments the pm_only counter must ensure that the
* counter is globally visible before the queue is unfrozen.
*/
if (blk_queue_pm_only(q) &&
(!pm || queue_rpm_status(q) == RPM_SUSPENDED))
goto fail_put;
rcu_read_unlock();
return true;
fail_put:
blk_queue_exit(q);
fail:
rcu_read_unlock();
return false;
}
static inline int bio_queue_enter(struct bio *bio)
{
struct request_queue *q = bdev_get_queue(bio->bi_bdev);
if (blk_try_enter_queue(q, false))
return 0;
return __bio_queue_enter(q, bio);
}
static inline void blk_wait_io(struct completion *done)
{
/* Prevent hang_check timer from firing at us during very long I/O */
unsigned long timeout = sysctl_hung_task_timeout_secs * HZ / 2;
if (timeout)
while (!wait_for_completion_io_timeout(done, timeout))
;
else
wait_for_completion_io(done);
}
#define BIO_INLINE_VECS 4
struct bio_vec *bvec_alloc(mempool_t *pool, unsigned short *nr_vecs,
gfp_t gfp_mask);
void bvec_free(mempool_t *pool, struct bio_vec *bv, unsigned short nr_vecs);
bool bvec_try_merge_hw_page(struct request_queue *q, struct bio_vec *bv,
struct page *page, unsigned len, unsigned offset,
bool *same_page);
static inline bool biovec_phys_mergeable(struct request_queue *q,
struct bio_vec *vec1, struct bio_vec *vec2)
{
unsigned long mask = queue_segment_boundary(q);
phys_addr_t addr1 = bvec_phys(vec1);
phys_addr_t addr2 = bvec_phys(vec2);
/*
* Merging adjacent physical pages may not work correctly under KMSAN
* if their metadata pages aren't adjacent. Just disable merging.
*/
if (IS_ENABLED(CONFIG_KMSAN))
return false;
if (addr1 + vec1->bv_len != addr2)
return false;
if (xen_domain() && !xen_biovec_phys_mergeable(vec1, vec2->bv_page))
return false;
if ((addr1 | mask) != ((addr2 + vec2->bv_len - 1) | mask))
return false;
return true;
}
static inline bool __bvec_gap_to_prev(const struct queue_limits *lim,
struct bio_vec *bprv, unsigned int offset)
{
return (offset & lim->virt_boundary_mask) ||
((bprv->bv_offset + bprv->bv_len) & lim->virt_boundary_mask);
}
/*
* Check if adding a bio_vec after bprv with offset would create a gap in
* the SG list. Most drivers don't care about this, but some do.
*/
static inline bool bvec_gap_to_prev(const struct queue_limits *lim,
struct bio_vec *bprv, unsigned int offset)
{
if (!lim->virt_boundary_mask)
return false;
return __bvec_gap_to_prev(lim, bprv, offset);
}
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;
}
/*
* There are two different ways to handle DISCARD merges:
* 1) If max_discard_segments > 1, the driver treats every bio as a range and
* send the bios to controller together. The ranges don't need to be
* contiguous.
* 2) Otherwise, the request will be normal read/write requests. The ranges
* need to be contiguous.
*/
static inline bool blk_discard_mergable(struct request *req)
{
if (req_op(req) == REQ_OP_DISCARD &&
queue_max_discard_segments(req->q) > 1)
return true;
return false;
}
static inline unsigned int blk_rq_get_max_segments(struct request *rq)
{
if (req_op(rq) == REQ_OP_DISCARD)
return queue_max_discard_segments(rq->q);
return queue_max_segments(rq->q);
}
static inline unsigned int blk_queue_get_max_sectors(struct request *rq)
{
struct request_queue *q = rq->q;
enum req_op op = req_op(rq);
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_ZEROES))
return q->limits.max_write_zeroes_sectors;
if (rq->cmd_flags & REQ_ATOMIC)
return q->limits.atomic_write_max_sectors;
return q->limits.max_sectors;
}
#ifdef CONFIG_BLK_DEV_INTEGRITY
void blk_flush_integrity(void);
void bio_integrity_free(struct bio *bio);
/*
* Integrity payloads can either be owned by the submitter, in which case
* bio_uninit will free them, or owned and generated by the block layer,
* in which case we'll verify them here (for reads) and free them before
* the bio is handed back to the submitted.
*/
bool __bio_integrity_endio(struct bio *bio);
static inline bool bio_integrity_endio(struct bio *bio)
{
struct bio_integrity_payload *bip = bio_integrity(bio);
if (bip && (bip->bip_flags & BIP_BLOCK_INTEGRITY))
return __bio_integrity_endio(bio);
return true;
}
bool blk_integrity_merge_rq(struct request_queue *, struct request *,
struct request *);
bool blk_integrity_merge_bio(struct request_queue *, struct request *,
struct bio *);
static inline bool integrity_req_gap_back_merge(struct request *req,
struct bio *next)
{
struct bio_integrity_payload *bip = bio_integrity(req->bio);
struct bio_integrity_payload *bip_next = bio_integrity(next);
return bvec_gap_to_prev(&req->q->limits,
&bip->bip_vec[bip->bip_vcnt - 1],
bip_next->bip_vec[0].bv_offset);
}
static inline bool integrity_req_gap_front_merge(struct request *req,
struct bio *bio)
{
struct bio_integrity_payload *bip = bio_integrity(bio);
struct bio_integrity_payload *bip_next = bio_integrity(req->bio);
return bvec_gap_to_prev(&req->q->limits,
&bip->bip_vec[bip->bip_vcnt - 1],
bip_next->bip_vec[0].bv_offset);
}
extern const struct attribute_group blk_integrity_attr_group;
#else /* CONFIG_BLK_DEV_INTEGRITY */
static inline bool blk_integrity_merge_rq(struct request_queue *rq,
struct request *r1, struct request *r2)
{
return true;
}
static inline bool blk_integrity_merge_bio(struct request_queue *rq,
struct request *r, struct bio *b)
{
return true;
}
static inline bool integrity_req_gap_back_merge(struct request *req,
struct bio *next)
{
return false;
}
static inline bool integrity_req_gap_front_merge(struct request *req,
struct bio *bio)
{
return false;
}
static inline void blk_flush_integrity(void)
{
}
static inline bool bio_integrity_endio(struct bio *bio)
{
return true;
}
static inline void bio_integrity_free(struct bio *bio)
{
}
#endif /* CONFIG_BLK_DEV_INTEGRITY */
unsigned long blk_rq_timeout(unsigned long timeout);
void blk_add_timer(struct request *req);
enum bio_merge_status {
BIO_MERGE_OK,
BIO_MERGE_NONE,
BIO_MERGE_FAILED,
};
enum bio_merge_status bio_attempt_back_merge(struct request *req,
struct bio *bio, unsigned int nr_segs);
bool blk_attempt_plug_merge(struct request_queue *q, struct bio *bio,
unsigned int nr_segs);
bool blk_bio_list_merge(struct request_queue *q, struct list_head *list,
struct bio *bio, unsigned int nr_segs);
/*
* Plug flush limits
*/
#define BLK_MAX_REQUEST_COUNT 32
#define BLK_PLUG_FLUSH_SIZE (128 * 1024)
/*
* Internal elevator interface
*/
#define ELV_ON_HASH(rq) ((rq)->rq_flags & RQF_HASHED)
bool blk_insert_flush(struct request *rq);
int elevator_switch(struct request_queue *q, struct elevator_type *new_e);
void elevator_disable(struct request_queue *q);
void elevator_exit(struct request_queue *q);
int elv_register_queue(struct request_queue *q, bool uevent);
void elv_unregister_queue(struct request_queue *q);
ssize_t part_size_show(struct device *dev, struct device_attribute *attr,
char *buf);
ssize_t part_stat_show(struct device *dev, struct device_attribute *attr,
char *buf);
ssize_t part_inflight_show(struct device *dev, struct device_attribute *attr,
char *buf);
ssize_t part_fail_show(struct device *dev, struct device_attribute *attr,
char *buf);
ssize_t part_fail_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count);
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);
static inline bool bio_may_exceed_limits(struct bio *bio,
const struct queue_limits *lim)
{
switch (bio_op(bio)) {
case REQ_OP_DISCARD:
case REQ_OP_SECURE_ERASE:
case REQ_OP_WRITE_ZEROES:
return true; /* non-trivial splitting decisions */
default:
break;
}
/*
* All drivers must accept single-segments bios that are <= PAGE_SIZE.
* This is a quick and dirty check that relies on the fact that
* bi_io_vec[0] is always valid if a bio has data. The check might
* lead to occasional false negatives when bios are cloned, but compared
* to the performance impact of cloned bios themselves the loop below
* doesn't matter anyway.
*/
return lim->chunk_sectors || bio->bi_vcnt != 1 ||
bio->bi_io_vec->bv_len + bio->bi_io_vec->bv_offset > PAGE_SIZE;
}
struct bio *__bio_split_to_limits(struct bio *bio,
const struct queue_limits *lim,
unsigned int *nr_segs);
int ll_back_merge_fn(struct request *req, struct bio *bio,
unsigned int nr_segs);
bool blk_attempt_req_merge(struct request_queue *q, struct request *rq,
struct request *next);
unsigned int blk_recalc_rq_segments(struct request *rq);
bool blk_rq_merge_ok(struct request *rq, struct bio *bio);
enum elv_merge blk_try_merge(struct request *rq, struct bio *bio);
int blk_set_default_limits(struct queue_limits *lim);
void blk_apply_bdi_limits(struct backing_dev_info *bdi,
struct queue_limits *lim);
int blk_dev_init(void);
/*
* Contribute to IO statistics IFF:
*
* a) it's attached to a gendisk, and
* b) the queue had IO stats enabled when this request was started
*/
static inline bool blk_do_io_stat(struct request *rq)
{
return (rq->rq_flags & RQF_IO_STAT) && !blk_rq_is_passthrough(rq);
}
void update_io_ticks(struct block_device *part, unsigned long now, bool end);
unsigned int part_in_flight(struct block_device *part);
static inline void req_set_nomerge(struct request_queue *q, struct request *req)
{
req->cmd_flags |= REQ_NOMERGE;
if (req == q->last_merge)
q->last_merge = NULL;
}
/*
* Internal io_context interface
*/
struct io_cq *ioc_find_get_icq(struct request_queue *q);
struct io_cq *ioc_lookup_icq(struct request_queue *q);
#ifdef CONFIG_BLK_ICQ
void ioc_clear_queue(struct request_queue *q);
#else
static inline void ioc_clear_queue(struct request_queue *q)
{
}
#endif /* CONFIG_BLK_ICQ */
struct bio *__blk_queue_bounce(struct bio *bio, struct request_queue *q);
static inline bool blk_queue_may_bounce(struct request_queue *q)
{
return IS_ENABLED(CONFIG_BOUNCE) &&
(q->limits.features & BLK_FEAT_BOUNCE_HIGH) &&
max_low_pfn >= max_pfn;
}
static inline struct bio *blk_queue_bounce(struct bio *bio,
struct request_queue *q)
{
if (unlikely(blk_queue_may_bounce(q) && bio_has_data(bio)))
return __blk_queue_bounce(bio, q);
return bio;
}
#ifdef CONFIG_BLK_DEV_ZONED
void disk_init_zone_resources(struct gendisk *disk);
void disk_free_zone_resources(struct gendisk *disk);
static inline bool bio_zone_write_plugging(struct bio *bio)
{
return bio_flagged(bio, BIO_ZONE_WRITE_PLUGGING);
}
static inline bool bio_is_zone_append(struct bio *bio)
{
return bio_op(bio) == REQ_OP_ZONE_APPEND ||
bio_flagged(bio, BIO_EMULATES_ZONE_APPEND);
}
void blk_zone_write_plug_bio_merged(struct bio *bio);
void blk_zone_write_plug_init_request(struct request *rq);
static inline void blk_zone_update_request_bio(struct request *rq,
struct bio *bio)
{
/*
* For zone append requests, the request sector indicates the location
* at which the BIO data was written. Return this value to the BIO
* issuer through the BIO iter sector.
* For plugged zone writes, which include emulated zone append, we need
* the original BIO sector so that blk_zone_write_plug_bio_endio() can
* lookup the zone write plug.
*/
if (req_op(rq) == REQ_OP_ZONE_APPEND || bio_zone_write_plugging(bio))
bio->bi_iter.bi_sector = rq->__sector;
}
void blk_zone_write_plug_bio_endio(struct bio *bio);
static inline void blk_zone_bio_endio(struct bio *bio)
{
/*
* For write BIOs to zoned devices, signal the completion of the BIO so
* that the next write BIO can be submitted by zone write plugging.
*/
if (bio_zone_write_plugging(bio))
blk_zone_write_plug_bio_endio(bio);
}
void blk_zone_write_plug_finish_request(struct request *rq);
static inline void blk_zone_finish_request(struct request *rq)
{
if (rq->rq_flags & RQF_ZONE_WRITE_PLUGGING)
blk_zone_write_plug_finish_request(rq);
}
int blkdev_report_zones_ioctl(struct block_device *bdev, unsigned int cmd,
unsigned long arg);
int blkdev_zone_mgmt_ioctl(struct block_device *bdev, blk_mode_t mode,
unsigned int cmd, unsigned long arg);
#else /* CONFIG_BLK_DEV_ZONED */
static inline void disk_init_zone_resources(struct gendisk *disk)
{
}
static inline void disk_free_zone_resources(struct gendisk *disk)
{
}
static inline bool bio_zone_write_plugging(struct bio *bio)
{
return false;
}
static inline bool bio_is_zone_append(struct bio *bio)
{
return false;
}
static inline void blk_zone_write_plug_bio_merged(struct bio *bio)
{
}
static inline void blk_zone_write_plug_init_request(struct request *rq)
{
}
static inline void blk_zone_update_request_bio(struct request *rq,
struct bio *bio)
{
}
static inline void blk_zone_bio_endio(struct bio *bio)
{
}
static inline void blk_zone_finish_request(struct request *rq)
{
}
static inline int blkdev_report_zones_ioctl(struct block_device *bdev,
unsigned int cmd, unsigned long arg)
{
return -ENOTTY;
}
static inline int blkdev_zone_mgmt_ioctl(struct block_device *bdev,
blk_mode_t mode, unsigned int cmd, unsigned long arg)
{
return -ENOTTY;
}
#endif /* CONFIG_BLK_DEV_ZONED */
struct block_device *bdev_alloc(struct gendisk *disk, u8 partno);
void bdev_add(struct block_device *bdev, dev_t dev);
void bdev_unhash(struct block_device *bdev);
void bdev_drop(struct block_device *bdev);
int blk_alloc_ext_minor(void);
void blk_free_ext_minor(unsigned int minor);
#define ADDPART_FLAG_NONE 0
#define ADDPART_FLAG_RAID 1
#define ADDPART_FLAG_WHOLEDISK 2
int bdev_add_partition(struct gendisk *disk, int partno, sector_t start,
sector_t length);
int bdev_del_partition(struct gendisk *disk, int partno);
int bdev_resize_partition(struct gendisk *disk, int partno, sector_t start,
sector_t length);
void drop_partition(struct block_device *part);
void bdev_set_nr_sectors(struct block_device *bdev, sector_t sectors);
struct gendisk *__alloc_disk_node(struct request_queue *q, int node_id,
struct lock_class_key *lkclass);
int bio_add_hw_page(struct request_queue *q, struct bio *bio,
struct page *page, unsigned int len, unsigned int offset,
unsigned int max_sectors, bool *same_page);
/*
* Clean up a page appropriately, where the page may be pinned, may have a
* ref taken on it or neither.
*/
static inline void bio_release_page(struct bio *bio, struct page *page)
{
if (bio_flagged(bio, BIO_PAGE_PINNED))
unpin_user_page(page);
}
struct request_queue *blk_alloc_queue(struct queue_limits *lim, int node_id);
int disk_scan_partitions(struct gendisk *disk, blk_mode_t mode);
int disk_alloc_events(struct gendisk *disk);
void disk_add_events(struct gendisk *disk);
void disk_del_events(struct gendisk *disk);
void disk_release_events(struct gendisk *disk);
void disk_block_events(struct gendisk *disk);
void disk_unblock_events(struct gendisk *disk);
void disk_flush_events(struct gendisk *disk, unsigned int mask);
extern struct device_attribute dev_attr_events;
extern struct device_attribute dev_attr_events_async;
extern struct device_attribute dev_attr_events_poll_msecs;
extern struct attribute_group blk_trace_attr_group;
blk_mode_t file_to_blk_mode(struct file *file);
int truncate_bdev_range(struct block_device *bdev, blk_mode_t mode,
loff_t lstart, loff_t lend);
long blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg);
long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg);
extern const struct address_space_operations def_blk_aops;
int disk_register_independent_access_ranges(struct gendisk *disk);
void disk_unregister_independent_access_ranges(struct gendisk *disk);
#ifdef CONFIG_FAIL_MAKE_REQUEST
bool should_fail_request(struct block_device *part, unsigned int bytes);
#else /* CONFIG_FAIL_MAKE_REQUEST */
static inline bool should_fail_request(struct block_device *part,
unsigned int bytes)
{
return false;
}
#endif /* CONFIG_FAIL_MAKE_REQUEST */
/*
* Optimized request reference counting. Ideally we'd make timeouts be more
* clever, as that's the only reason we need references at all... But until
* this happens, this is faster than using refcount_t. Also see:
*
* abc54d634334 ("io_uring: switch to atomic_t for io_kiocb reference count")
*/
#define req_ref_zero_or_close_to_overflow(req) \
((unsigned int) atomic_read(&(req->ref)) + 127u <= 127u)
static inline bool req_ref_inc_not_zero(struct request *req)
{
return atomic_inc_not_zero(&req->ref);
}
static inline bool req_ref_put_and_test(struct request *req)
{
WARN_ON_ONCE(req_ref_zero_or_close_to_overflow(req));
return atomic_dec_and_test(&req->ref);
}
static inline void req_ref_set(struct request *req, int value)
{
atomic_set(&req->ref, value);
}
static inline int req_ref_read(struct request *req)
{
return atomic_read(&req->ref);
}
static inline u64 blk_time_get_ns(void)
{
struct blk_plug *plug = current->plug;
if (!plug || !in_task())
return ktime_get_ns();
/*
* 0 could very well be a valid time, but rather than flag "this is
* a valid timestamp" separately, just accept that we'll do an extra
* ktime_get_ns() if we just happen to get 0 as the current time.
*/
if (!plug->cur_ktime) {
plug->cur_ktime = ktime_get_ns();
current->flags |= PF_BLOCK_TS;
}
return plug->cur_ktime;
}
static inline ktime_t blk_time_get(void)
{
return ns_to_ktime(blk_time_get_ns());
}
/*
* From most significant bit:
* 1 bit: reserved for other usage, see below
* 12 bits: original size of bio
* 51 bits: issue time of bio
*/
#define BIO_ISSUE_RES_BITS 1
#define BIO_ISSUE_SIZE_BITS 12
#define BIO_ISSUE_RES_SHIFT (64 - BIO_ISSUE_RES_BITS)
#define BIO_ISSUE_SIZE_SHIFT (BIO_ISSUE_RES_SHIFT - BIO_ISSUE_SIZE_BITS)
#define BIO_ISSUE_TIME_MASK ((1ULL << BIO_ISSUE_SIZE_SHIFT) - 1)
#define BIO_ISSUE_SIZE_MASK \
(((1ULL << BIO_ISSUE_SIZE_BITS) - 1) << BIO_ISSUE_SIZE_SHIFT)
#define BIO_ISSUE_RES_MASK (~((1ULL << BIO_ISSUE_RES_SHIFT) - 1))
/* Reserved bit for blk-throtl */
#define BIO_ISSUE_THROTL_SKIP_LATENCY (1ULL << 63)
static inline u64 __bio_issue_time(u64 time)
{
return time & BIO_ISSUE_TIME_MASK;
}
static inline u64 bio_issue_time(struct bio_issue *issue)
{
return __bio_issue_time(issue->value);
}
static inline sector_t bio_issue_size(struct bio_issue *issue)
{
return ((issue->value & BIO_ISSUE_SIZE_MASK) >> BIO_ISSUE_SIZE_SHIFT);
}
static inline void bio_issue_init(struct bio_issue *issue,
sector_t size)
{
size &= (1ULL << BIO_ISSUE_SIZE_BITS) - 1;
issue->value = ((issue->value & BIO_ISSUE_RES_MASK) |
(blk_time_get_ns() & BIO_ISSUE_TIME_MASK) |
((u64)size << BIO_ISSUE_SIZE_SHIFT));
}
void bdev_release(struct file *bdev_file);
int bdev_open(struct block_device *bdev, blk_mode_t mode, void *holder,
const struct blk_holder_ops *hops, struct file *bdev_file);
int bdev_permission(dev_t dev, blk_mode_t mode, void *holder);
void blk_integrity_generate(struct bio *bio);
void blk_integrity_verify(struct bio *bio);
void blk_integrity_prepare(struct request *rq);
void blk_integrity_complete(struct request *rq, unsigned int nr_bytes);
#endif /* BLK_INTERNAL_H */