Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | #ifndef _LINUX_BLKDEV_H |
| 2 | #define _LINUX_BLKDEV_H |
| 3 | |
Russell King | 85fd0bc | 2012-05-14 08:29:23 +0200 | [diff] [blame] | 4 | #include <linux/sched.h> |
| 5 | |
Jens Axboe | f5ff842 | 2007-09-21 09:19:54 +0200 | [diff] [blame] | 6 | #ifdef CONFIG_BLOCK |
| 7 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | #include <linux/major.h> |
| 9 | #include <linux/genhd.h> |
| 10 | #include <linux/list.h> |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 11 | #include <linux/llist.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 12 | #include <linux/timer.h> |
| 13 | #include <linux/workqueue.h> |
| 14 | #include <linux/pagemap.h> |
Tejun Heo | 66114ca | 2015-05-22 17:13:32 -0400 | [diff] [blame] | 15 | #include <linux/backing-dev-defs.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | #include <linux/wait.h> |
| 17 | #include <linux/mempool.h> |
Dan Williams | 34c0fd5 | 2016-01-15 16:56:14 -0800 | [diff] [blame] | 18 | #include <linux/pfn.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | #include <linux/bio.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | #include <linux/stringify.h> |
Hugh Dickins | 3e6053d | 2008-09-11 10:57:55 +0200 | [diff] [blame] | 21 | #include <linux/gfp.h> |
FUJITA Tomonori | d351af0 | 2007-07-09 12:40:35 +0200 | [diff] [blame] | 22 | #include <linux/bsg.h> |
Jens Axboe | c7c22e4 | 2008-09-13 20:26:01 +0200 | [diff] [blame] | 23 | #include <linux/smp.h> |
Tejun Heo | 548bc8e | 2013-01-09 08:05:13 -0800 | [diff] [blame] | 24 | #include <linux/rcupdate.h> |
Tejun Heo | add703f | 2014-07-01 10:34:38 -0600 | [diff] [blame] | 25 | #include <linux/percpu-refcount.h> |
Christoph Hellwig | 84be456 | 2015-05-01 12:46:15 +0200 | [diff] [blame] | 26 | #include <linux/scatterlist.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | |
Paul Gortmaker | de47725 | 2011-05-26 13:46:22 -0400 | [diff] [blame] | 28 | struct module; |
Christoph Hellwig | 21b2f0c | 2006-03-22 17:52:04 +0100 | [diff] [blame] | 29 | struct scsi_ioctl_command; |
| 30 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | struct request_queue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | struct elevator_queue; |
Jens Axboe | 2056a78 | 2006-03-23 20:00:26 +0100 | [diff] [blame] | 33 | struct blk_trace; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 34 | struct request; |
| 35 | struct sg_io_hdr; |
Mike Christie | aa387cc | 2011-07-31 22:05:09 +0200 | [diff] [blame] | 36 | struct bsg_job; |
Tejun Heo | 3c79839 | 2012-04-16 13:57:25 -0700 | [diff] [blame] | 37 | struct blkcg_gq; |
Ming Lei | 7c94e1c | 2014-09-25 23:23:43 +0800 | [diff] [blame] | 38 | struct blk_flush_queue; |
Christoph Hellwig | bbd3e06 | 2015-10-15 14:10:48 +0200 | [diff] [blame] | 39 | struct pr_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | |
| 41 | #define BLKDEV_MIN_RQ 4 |
| 42 | #define BLKDEV_MAX_RQ 128 /* Default maximum */ |
| 43 | |
Tejun Heo | 8bd435b | 2012-04-13 13:11:28 -0700 | [diff] [blame] | 44 | /* |
| 45 | * Maximum number of blkcg policies allowed to be registered concurrently. |
| 46 | * Defined here to simplify include dependency. |
| 47 | */ |
| 48 | #define BLKCG_MAX_POLS 2 |
| 49 | |
Tejun Heo | 8ffdc65 | 2006-01-06 09:49:03 +0100 | [diff] [blame] | 50 | typedef void (rq_end_io_fn)(struct request *, int); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | |
Tejun Heo | 5b788ce | 2012-06-04 20:40:59 -0700 | [diff] [blame] | 52 | #define BLK_RL_SYNCFULL (1U << 0) |
| 53 | #define BLK_RL_ASYNCFULL (1U << 1) |
| 54 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | struct request_list { |
Tejun Heo | 5b788ce | 2012-06-04 20:40:59 -0700 | [diff] [blame] | 56 | struct request_queue *q; /* the queue this rl belongs to */ |
Tejun Heo | a051661 | 2012-06-26 15:05:44 -0700 | [diff] [blame] | 57 | #ifdef CONFIG_BLK_CGROUP |
| 58 | struct blkcg_gq *blkg; /* blkg this request pool belongs to */ |
| 59 | #endif |
Jens Axboe | 1faa16d | 2009-04-06 14:48:01 +0200 | [diff] [blame] | 60 | /* |
| 61 | * count[], starved[], and wait[] are indexed by |
| 62 | * BLK_RW_SYNC/BLK_RW_ASYNC |
| 63 | */ |
Tejun Heo | 8a5ecdd | 2012-06-04 20:40:58 -0700 | [diff] [blame] | 64 | int count[2]; |
| 65 | int starved[2]; |
| 66 | mempool_t *rq_pool; |
| 67 | wait_queue_head_t wait[2]; |
Tejun Heo | 5b788ce | 2012-06-04 20:40:59 -0700 | [diff] [blame] | 68 | unsigned int flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | }; |
| 70 | |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 71 | /* |
| 72 | * request command types |
| 73 | */ |
| 74 | enum rq_cmd_type_bits { |
| 75 | REQ_TYPE_FS = 1, /* fs request */ |
| 76 | REQ_TYPE_BLOCK_PC, /* scsi command */ |
Christoph Hellwig | b42171e | 2015-04-17 22:37:17 +0200 | [diff] [blame] | 77 | REQ_TYPE_DRV_PRIV, /* driver defined types from here */ |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 78 | }; |
| 79 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | #define BLK_MAX_CDB 16 |
| 81 | |
| 82 | /* |
Christoph Hellwig | af76e55 | 2014-05-06 12:12:45 +0200 | [diff] [blame] | 83 | * Try to put the fields that are referenced together in the same cacheline. |
| 84 | * |
| 85 | * If you modify this structure, make sure to update blk_rq_init() and |
| 86 | * especially blk_mq_rq_ctx_init() to take care of the added fields. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | */ |
| 88 | struct request { |
Christoph Hellwig | 6897fc2 | 2014-01-30 15:45:47 -0800 | [diff] [blame] | 89 | struct list_head queuelist; |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 90 | union { |
| 91 | struct call_single_data csd; |
Jan Kara | 9828c2c | 2016-06-28 09:03:59 +0200 | [diff] [blame] | 92 | u64 fifo_time; |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 93 | }; |
Jens Axboe | ff856ba | 2006-01-09 16:02:34 +0100 | [diff] [blame] | 94 | |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 95 | struct request_queue *q; |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 96 | struct blk_mq_ctx *mq_ctx; |
Jens Axboe | e6a1c87 | 2006-08-10 09:00:21 +0200 | [diff] [blame] | 97 | |
Richard Kennedy | 181fdde | 2010-03-19 08:58:16 +0100 | [diff] [blame] | 98 | int cpu; |
Christoph Hellwig | ca93e45 | 2016-06-09 16:00:35 +0200 | [diff] [blame] | 99 | unsigned cmd_type; |
| 100 | u64 cmd_flags; |
| 101 | unsigned long atomic_flags; |
Richard Kennedy | 181fdde | 2010-03-19 08:58:16 +0100 | [diff] [blame] | 102 | |
Tejun Heo | a2dec7b | 2009-05-07 22:24:44 +0900 | [diff] [blame] | 103 | /* the following two fields are internal, NEVER access directly */ |
Tejun Heo | a2dec7b | 2009-05-07 22:24:44 +0900 | [diff] [blame] | 104 | unsigned int __data_len; /* total data len */ |
Richard Kennedy | 181fdde | 2010-03-19 08:58:16 +0100 | [diff] [blame] | 105 | sector_t __sector; /* sector cursor */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | |
| 107 | struct bio *bio; |
| 108 | struct bio *biotail; |
| 109 | |
Jens Axboe | 360f92c | 2014-04-09 20:27:01 -0600 | [diff] [blame] | 110 | /* |
| 111 | * The hash is used inside the scheduler, and killed once the |
| 112 | * request reaches the dispatch list. The ipi_list is only used |
| 113 | * to queue the request for softirq completion, which is long |
| 114 | * after the request has been unhashed (and even removed from |
| 115 | * the dispatch list). |
| 116 | */ |
| 117 | union { |
| 118 | struct hlist_node hash; /* merge hash */ |
| 119 | struct list_head ipi_list; |
| 120 | }; |
| 121 | |
Jens Axboe | e6a1c87 | 2006-08-10 09:00:21 +0200 | [diff] [blame] | 122 | /* |
| 123 | * The rb_node is only used inside the io scheduler, requests |
| 124 | * are pruned when moved to the dispatch queue. So let the |
Mike Snitzer | c186794 | 2011-02-11 11:08:00 +0100 | [diff] [blame] | 125 | * completion_data share space with the rb_node. |
Jens Axboe | e6a1c87 | 2006-08-10 09:00:21 +0200 | [diff] [blame] | 126 | */ |
| 127 | union { |
| 128 | struct rb_node rb_node; /* sort/lookup */ |
Mike Snitzer | c186794 | 2011-02-11 11:08:00 +0100 | [diff] [blame] | 129 | void *completion_data; |
Jens Axboe | e6a1c87 | 2006-08-10 09:00:21 +0200 | [diff] [blame] | 130 | }; |
Jens Axboe | 9817064 | 2006-07-28 09:23:08 +0200 | [diff] [blame] | 131 | |
Jens Axboe | ff7d145 | 2006-07-12 14:04:37 +0200 | [diff] [blame] | 132 | /* |
Vivek Goyal | 7f1dc8a | 2010-04-21 17:44:16 +0200 | [diff] [blame] | 133 | * Three pointers are available for the IO schedulers, if they need |
Mike Snitzer | c186794 | 2011-02-11 11:08:00 +0100 | [diff] [blame] | 134 | * more they have to dynamically allocate it. Flush requests are |
| 135 | * never put on the IO scheduler. So let the flush fields share |
Tejun Heo | a612fdd | 2011-12-14 00:33:41 +0100 | [diff] [blame] | 136 | * space with the elevator data. |
Jens Axboe | ff7d145 | 2006-07-12 14:04:37 +0200 | [diff] [blame] | 137 | */ |
Mike Snitzer | c186794 | 2011-02-11 11:08:00 +0100 | [diff] [blame] | 138 | union { |
Tejun Heo | a612fdd | 2011-12-14 00:33:41 +0100 | [diff] [blame] | 139 | struct { |
| 140 | struct io_cq *icq; |
| 141 | void *priv[2]; |
| 142 | } elv; |
| 143 | |
Mike Snitzer | c186794 | 2011-02-11 11:08:00 +0100 | [diff] [blame] | 144 | struct { |
| 145 | unsigned int seq; |
| 146 | struct list_head list; |
Jeff Moyer | 4853aba | 2011-08-15 21:37:25 +0200 | [diff] [blame] | 147 | rq_end_io_fn *saved_end_io; |
Mike Snitzer | c186794 | 2011-02-11 11:08:00 +0100 | [diff] [blame] | 148 | } flush; |
| 149 | }; |
Jens Axboe | ff7d145 | 2006-07-12 14:04:37 +0200 | [diff] [blame] | 150 | |
Jens Axboe | 8f34ee7 | 2006-06-13 09:02:34 +0200 | [diff] [blame] | 151 | struct gendisk *rq_disk; |
Jerome Marchand | 09e099d | 2011-01-05 16:57:38 +0100 | [diff] [blame] | 152 | struct hd_struct *part; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | unsigned long start_time; |
Divyesh Shah | 9195291 | 2010-04-01 15:01:41 -0700 | [diff] [blame] | 154 | #ifdef CONFIG_BLK_CGROUP |
Tejun Heo | a051661 | 2012-06-26 15:05:44 -0700 | [diff] [blame] | 155 | struct request_list *rl; /* rl this rq is alloced from */ |
Divyesh Shah | 9195291 | 2010-04-01 15:01:41 -0700 | [diff] [blame] | 156 | unsigned long long start_time_ns; |
| 157 | unsigned long long io_start_time_ns; /* when passed to hardware */ |
| 158 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | /* Number of scatter-gather DMA addr+len pairs after |
| 160 | * physical address coalescing is performed. |
| 161 | */ |
| 162 | unsigned short nr_phys_segments; |
Martin K. Petersen | 13f05c8 | 2010-09-10 20:50:10 +0200 | [diff] [blame] | 163 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
| 164 | unsigned short nr_integrity_segments; |
| 165 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 166 | |
Jens Axboe | 8f34ee7 | 2006-06-13 09:02:34 +0200 | [diff] [blame] | 167 | unsigned short ioprio; |
| 168 | |
Tejun Heo | 731ec49 | 2009-04-23 11:05:20 +0900 | [diff] [blame] | 169 | void *special; /* opaque pointer available for LLD use */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 170 | |
Jens Axboe | cdd6026 | 2006-07-28 09:32:07 +0200 | [diff] [blame] | 171 | int tag; |
| 172 | int errors; |
| 173 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 174 | /* |
| 175 | * when request is used as a packet command carrier |
| 176 | */ |
FUJITA Tomonori | d7e3c32 | 2008-04-29 09:54:39 +0200 | [diff] [blame] | 177 | unsigned char __cmd[BLK_MAX_CDB]; |
| 178 | unsigned char *cmd; |
Richard Kennedy | 181fdde | 2010-03-19 08:58:16 +0100 | [diff] [blame] | 179 | unsigned short cmd_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | |
FUJITA Tomonori | 7a85f88 | 2008-03-04 11:17:11 +0100 | [diff] [blame] | 181 | unsigned int extra_len; /* length of alignment and padding */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | unsigned int sense_len; |
Tejun Heo | c3a4d78 | 2009-05-07 22:24:37 +0900 | [diff] [blame] | 183 | unsigned int resid_len; /* residual count */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 184 | void *sense; |
| 185 | |
Jens Axboe | 242f9dc | 2008-09-14 05:55:09 -0700 | [diff] [blame] | 186 | unsigned long deadline; |
| 187 | struct list_head timeout_list; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 188 | unsigned int timeout; |
Mike Christie | 17e01f2 | 2005-11-11 05:31:37 -0600 | [diff] [blame] | 189 | int retries; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 190 | |
| 191 | /* |
Jens Axboe | c00895a | 2006-09-30 20:29:12 +0200 | [diff] [blame] | 192 | * completion callback. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 193 | */ |
| 194 | rq_end_io_fn *end_io; |
| 195 | void *end_io_data; |
FUJITA Tomonori | abae1fd | 2007-07-16 08:52:14 +0200 | [diff] [blame] | 196 | |
| 197 | /* for bidi */ |
| 198 | struct request *next_rq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 199 | }; |
| 200 | |
Mike Christie | 4e1b2d52 | 2016-06-05 14:32:22 -0500 | [diff] [blame] | 201 | #define REQ_OP_SHIFT (8 * sizeof(u64) - REQ_OP_BITS) |
| 202 | #define req_op(req) ((req)->cmd_flags >> REQ_OP_SHIFT) |
| 203 | |
| 204 | #define req_set_op(req, op) do { \ |
| 205 | WARN_ON(op >= (1 << REQ_OP_BITS)); \ |
| 206 | (req)->cmd_flags &= ((1ULL << REQ_OP_SHIFT) - 1); \ |
| 207 | (req)->cmd_flags |= ((u64) (op) << REQ_OP_SHIFT); \ |
| 208 | } while (0) |
| 209 | |
Mike Christie | f215082 | 2016-06-05 14:31:42 -0500 | [diff] [blame] | 210 | #define req_set_op_attrs(req, op, flags) do { \ |
| 211 | req_set_op(req, op); \ |
| 212 | (req)->cmd_flags |= flags; \ |
| 213 | } while (0) |
| 214 | |
Christoph Hellwig | f321624 | 2017-01-31 16:57:29 +0100 | [diff] [blame] | 215 | static inline bool blk_rq_is_passthrough(struct request *rq) |
| 216 | { |
| 217 | return rq->cmd_type != REQ_TYPE_FS; |
| 218 | } |
| 219 | |
Fernando Luis Vázquez Cao | 766ca44 | 2008-08-14 09:59:13 +0200 | [diff] [blame] | 220 | static inline unsigned short req_get_ioprio(struct request *req) |
| 221 | { |
| 222 | return req->ioprio; |
| 223 | } |
| 224 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 225 | #include <linux/elevator.h> |
| 226 | |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 227 | struct blk_queue_ctx; |
| 228 | |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 229 | typedef void (request_fn_proc) (struct request_queue *q); |
Jens Axboe | dece163 | 2015-11-05 10:41:16 -0700 | [diff] [blame] | 230 | typedef blk_qc_t (make_request_fn) (struct request_queue *q, struct bio *bio); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 231 | typedef int (prep_rq_fn) (struct request_queue *, struct request *); |
James Bottomley | 28018c2 | 2010-07-01 19:49:17 +0900 | [diff] [blame] | 232 | typedef void (unprep_rq_fn) (struct request_queue *, struct request *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 233 | |
| 234 | struct bio_vec; |
Jens Axboe | ff856ba | 2006-01-09 16:02:34 +0100 | [diff] [blame] | 235 | typedef void (softirq_done_fn)(struct request *); |
Tejun Heo | 2fb98e8 | 2008-02-19 11:36:53 +0100 | [diff] [blame] | 236 | typedef int (dma_drain_needed_fn)(struct request *); |
Kiyoshi Ueda | ef9e3fa | 2008-10-01 16:12:15 +0200 | [diff] [blame] | 237 | typedef int (lld_busy_fn) (struct request_queue *q); |
Mike Christie | aa387cc | 2011-07-31 22:05:09 +0200 | [diff] [blame] | 238 | typedef int (bsg_job_fn) (struct bsg_job *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 239 | |
Jens Axboe | 242f9dc | 2008-09-14 05:55:09 -0700 | [diff] [blame] | 240 | enum blk_eh_timer_return { |
| 241 | BLK_EH_NOT_HANDLED, |
| 242 | BLK_EH_HANDLED, |
| 243 | BLK_EH_RESET_TIMER, |
| 244 | }; |
| 245 | |
| 246 | typedef enum blk_eh_timer_return (rq_timed_out_fn)(struct request *); |
| 247 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 248 | enum blk_queue_state { |
| 249 | Queue_down, |
| 250 | Queue_up, |
| 251 | }; |
| 252 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 253 | struct blk_queue_tag { |
| 254 | struct request **tag_index; /* map of busy tags */ |
| 255 | unsigned long *tag_map; /* bit map of free/busy tags */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 256 | int busy; /* current depth */ |
| 257 | int max_depth; /* what we will send to device */ |
Tejun Heo | ba02508 | 2005-08-05 13:28:11 -0700 | [diff] [blame] | 258 | int real_max_depth; /* what the array can hold */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 259 | atomic_t refcnt; /* map can be shared */ |
Shaohua Li | ee1b6f7 | 2015-01-15 17:32:25 -0800 | [diff] [blame] | 260 | int alloc_policy; /* tag allocation policy */ |
| 261 | int next_tag; /* next tag */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 262 | }; |
Shaohua Li | ee1b6f7 | 2015-01-15 17:32:25 -0800 | [diff] [blame] | 263 | #define BLK_TAG_ALLOC_FIFO 0 /* allocate starting from 0 */ |
| 264 | #define BLK_TAG_ALLOC_RR 1 /* allocate starting from last allocated tag */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 265 | |
FUJITA Tomonori | abf5439 | 2008-08-16 14:10:05 +0900 | [diff] [blame] | 266 | #define BLK_SCSI_MAX_CMDS (256) |
| 267 | #define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8)) |
| 268 | |
Martin K. Petersen | 025146e | 2009-05-22 17:17:51 -0400 | [diff] [blame] | 269 | struct queue_limits { |
| 270 | unsigned long bounce_pfn; |
| 271 | unsigned long seg_boundary_mask; |
Keith Busch | 03100aa | 2015-08-19 14:24:05 -0700 | [diff] [blame] | 272 | unsigned long virt_boundary_mask; |
Martin K. Petersen | 025146e | 2009-05-22 17:17:51 -0400 | [diff] [blame] | 273 | |
| 274 | unsigned int max_hw_sectors; |
Martin K. Petersen | ca369d5 | 2015-11-13 16:46:48 -0500 | [diff] [blame] | 275 | unsigned int max_dev_sectors; |
Jens Axboe | 762380a | 2014-06-05 13:38:39 -0600 | [diff] [blame] | 276 | unsigned int chunk_sectors; |
Martin K. Petersen | 025146e | 2009-05-22 17:17:51 -0400 | [diff] [blame] | 277 | unsigned int max_sectors; |
| 278 | unsigned int max_segment_size; |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 279 | unsigned int physical_block_size; |
Mikulas Patocka | 5dbde46 | 2020-01-15 08:35:25 -0500 | [diff] [blame] | 280 | unsigned int logical_block_size; |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 281 | unsigned int alignment_offset; |
| 282 | unsigned int io_min; |
| 283 | unsigned int io_opt; |
Christoph Hellwig | 67efc92 | 2009-09-30 13:54:20 +0200 | [diff] [blame] | 284 | unsigned int max_discard_sectors; |
Jens Axboe | 0034af0 | 2015-07-16 09:14:26 -0600 | [diff] [blame] | 285 | unsigned int max_hw_discard_sectors; |
Martin K. Petersen | 4363ac7 | 2012-09-18 12:19:27 -0400 | [diff] [blame] | 286 | unsigned int max_write_same_sectors; |
Martin K. Petersen | 86b3728 | 2009-11-10 11:50:21 +0100 | [diff] [blame] | 287 | unsigned int discard_granularity; |
| 288 | unsigned int discard_alignment; |
Martin K. Petersen | 025146e | 2009-05-22 17:17:51 -0400 | [diff] [blame] | 289 | |
Martin K. Petersen | 8a78362 | 2010-02-26 00:20:39 -0500 | [diff] [blame] | 290 | unsigned short max_segments; |
Martin K. Petersen | 13f05c8 | 2010-09-10 20:50:10 +0200 | [diff] [blame] | 291 | unsigned short max_integrity_segments; |
Martin K. Petersen | 025146e | 2009-05-22 17:17:51 -0400 | [diff] [blame] | 292 | |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 293 | unsigned char misaligned; |
Martin K. Petersen | 86b3728 | 2009-11-10 11:50:21 +0100 | [diff] [blame] | 294 | unsigned char discard_misaligned; |
Martin K. Petersen | e692cb6 | 2010-12-01 19:41:49 +0100 | [diff] [blame] | 295 | unsigned char cluster; |
Martin K. Petersen | a934a00 | 2011-05-18 10:37:35 +0200 | [diff] [blame] | 296 | unsigned char discard_zeroes_data; |
Kent Overstreet | c78afc6 | 2013-07-11 22:39:53 -0700 | [diff] [blame] | 297 | unsigned char raid_partial_stripes_expensive; |
Martin K. Petersen | 025146e | 2009-05-22 17:17:51 -0400 | [diff] [blame] | 298 | }; |
| 299 | |
Richard Kennedy | d7b7630 | 2011-07-13 21:17:23 +0200 | [diff] [blame] | 300 | struct request_queue { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 301 | /* |
| 302 | * Together with queue_head for cacheline sharing |
| 303 | */ |
| 304 | struct list_head queue_head; |
| 305 | struct request *last_merge; |
Jens Axboe | b374d18 | 2008-10-31 10:05:07 +0100 | [diff] [blame] | 306 | struct elevator_queue *elevator; |
Tejun Heo | 8a5ecdd | 2012-06-04 20:40:58 -0700 | [diff] [blame] | 307 | int nr_rqs[2]; /* # allocated [a]sync rqs */ |
| 308 | int nr_rqs_elvpriv; /* # allocated rqs w/ elvpriv */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 309 | |
| 310 | /* |
Tejun Heo | a051661 | 2012-06-26 15:05:44 -0700 | [diff] [blame] | 311 | * If blkcg is not used, @q->root_rl serves all requests. If blkcg |
| 312 | * is used, root blkg allocates from @q->root_rl and all other |
| 313 | * blkgs from their own blkg->rl. Which one to use should be |
| 314 | * determined using bio_request_list(). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 315 | */ |
Tejun Heo | a051661 | 2012-06-26 15:05:44 -0700 | [diff] [blame] | 316 | struct request_list root_rl; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 317 | |
| 318 | request_fn_proc *request_fn; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 319 | make_request_fn *make_request_fn; |
| 320 | prep_rq_fn *prep_rq_fn; |
James Bottomley | 28018c2 | 2010-07-01 19:49:17 +0900 | [diff] [blame] | 321 | unprep_rq_fn *unprep_rq_fn; |
Jens Axboe | ff856ba | 2006-01-09 16:02:34 +0100 | [diff] [blame] | 322 | softirq_done_fn *softirq_done_fn; |
Jens Axboe | 242f9dc | 2008-09-14 05:55:09 -0700 | [diff] [blame] | 323 | rq_timed_out_fn *rq_timed_out_fn; |
Tejun Heo | 2fb98e8 | 2008-02-19 11:36:53 +0100 | [diff] [blame] | 324 | dma_drain_needed_fn *dma_drain_needed; |
Kiyoshi Ueda | ef9e3fa | 2008-10-01 16:12:15 +0200 | [diff] [blame] | 325 | lld_busy_fn *lld_busy_fn; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 326 | |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 327 | struct blk_mq_ops *mq_ops; |
| 328 | |
| 329 | unsigned int *mq_map; |
| 330 | |
| 331 | /* sw queues */ |
Ming Lei | e6cdb09 | 2014-06-03 11:24:06 +0800 | [diff] [blame] | 332 | struct blk_mq_ctx __percpu *queue_ctx; |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 333 | unsigned int nr_queues; |
| 334 | |
| 335 | /* hw dispatch queues */ |
| 336 | struct blk_mq_hw_ctx **queue_hw_ctx; |
| 337 | unsigned int nr_hw_queues; |
| 338 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 339 | /* |
Tejun Heo | 8922e16 | 2005-10-20 16:23:44 +0200 | [diff] [blame] | 340 | * Dispatch queue sorting |
| 341 | */ |
Jens Axboe | 1b47f53 | 2005-10-20 16:37:00 +0200 | [diff] [blame] | 342 | sector_t end_sector; |
Tejun Heo | 8922e16 | 2005-10-20 16:23:44 +0200 | [diff] [blame] | 343 | struct request *boundary_rq; |
Tejun Heo | 8922e16 | 2005-10-20 16:23:44 +0200 | [diff] [blame] | 344 | |
| 345 | /* |
Jens Axboe | 3cca6dc | 2011-03-02 11:08:00 -0500 | [diff] [blame] | 346 | * Delayed queue handling |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 347 | */ |
Jens Axboe | 3cca6dc | 2011-03-02 11:08:00 -0500 | [diff] [blame] | 348 | struct delayed_work delay_work; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 349 | |
| 350 | struct backing_dev_info backing_dev_info; |
| 351 | |
| 352 | /* |
| 353 | * The queue owner gets to use this for whatever they like. |
| 354 | * ll_rw_blk doesn't touch it. |
| 355 | */ |
| 356 | void *queuedata; |
| 357 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 359 | * various queue flags, see QUEUE_* below |
| 360 | */ |
| 361 | unsigned long queue_flags; |
| 362 | |
| 363 | /* |
Tejun Heo | a73f730 | 2011-12-14 00:33:37 +0100 | [diff] [blame] | 364 | * ida allocated id for this queue. Used to index queues from |
| 365 | * ioctx. |
| 366 | */ |
| 367 | int id; |
| 368 | |
| 369 | /* |
Richard Kennedy | d7b7630 | 2011-07-13 21:17:23 +0200 | [diff] [blame] | 370 | * queue needs bounce pages for pages above this limit |
| 371 | */ |
| 372 | gfp_t bounce_gfp; |
| 373 | |
| 374 | /* |
| 152587d | 2005-04-12 16:22:06 -0500 | [diff] [blame] | 375 | * protects queue structures from reentrancy. ->__queue_lock should |
| 376 | * _never_ be used directly, it is queue private. always use |
| 377 | * ->queue_lock. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 378 | */ |
| 152587d | 2005-04-12 16:22:06 -0500 | [diff] [blame] | 379 | spinlock_t __queue_lock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 380 | spinlock_t *queue_lock; |
| 381 | |
| 382 | /* |
| 383 | * queue kobject |
| 384 | */ |
| 385 | struct kobject kobj; |
| 386 | |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 387 | /* |
| 388 | * mq queue kobject |
| 389 | */ |
| 390 | struct kobject mq_kobj; |
| 391 | |
Dan Williams | ac6fc48 | 2015-10-21 13:20:18 -0400 | [diff] [blame] | 392 | #ifdef CONFIG_BLK_DEV_INTEGRITY |
| 393 | struct blk_integrity integrity; |
| 394 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ |
| 395 | |
Rafael J. Wysocki | 47fafbc | 2014-12-04 01:00:23 +0100 | [diff] [blame] | 396 | #ifdef CONFIG_PM |
Lin Ming | 6c95466 | 2013-03-23 11:42:26 +0800 | [diff] [blame] | 397 | struct device *dev; |
| 398 | int rpm_status; |
| 399 | unsigned int nr_pending; |
| 400 | #endif |
| 401 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 402 | /* |
| 403 | * queue settings |
| 404 | */ |
| 405 | unsigned long nr_requests; /* Max # of requests */ |
| 406 | unsigned int nr_congestion_on; |
| 407 | unsigned int nr_congestion_off; |
| 408 | unsigned int nr_batching; |
| 409 | |
James Bottomley | fa0ccd8 | 2008-01-10 11:30:36 -0600 | [diff] [blame] | 410 | unsigned int dma_drain_size; |
Richard Kennedy | d7b7630 | 2011-07-13 21:17:23 +0200 | [diff] [blame] | 411 | void *dma_drain_buffer; |
Tejun Heo | e3790c7 | 2008-03-04 11:18:17 +0100 | [diff] [blame] | 412 | unsigned int dma_pad_mask; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 413 | unsigned int dma_alignment; |
| 414 | |
| 415 | struct blk_queue_tag *queue_tags; |
Jens Axboe | 6eca900 | 2007-10-25 10:14:47 +0200 | [diff] [blame] | 416 | struct list_head tag_busy_list; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 417 | |
Tejun Heo | 15853af | 2005-11-10 08:52:05 +0100 | [diff] [blame] | 418 | unsigned int nr_sorted; |
Jens Axboe | 0a7ae2f | 2009-05-20 08:54:31 +0200 | [diff] [blame] | 419 | unsigned int in_flight[2]; |
Bart Van Assche | 24faf6f | 2012-11-28 13:46:45 +0100 | [diff] [blame] | 420 | /* |
| 421 | * Number of active block driver functions for which blk_drain_queue() |
| 422 | * must wait. Must be incremented around functions that unlock the |
| 423 | * queue_lock internally, e.g. scsi_request_fn(). |
| 424 | */ |
| 425 | unsigned int request_fn_active; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 426 | |
Jens Axboe | 242f9dc | 2008-09-14 05:55:09 -0700 | [diff] [blame] | 427 | unsigned int rq_timeout; |
| 428 | struct timer_list timeout; |
Christoph Hellwig | 287922e | 2015-10-30 20:57:30 +0800 | [diff] [blame] | 429 | struct work_struct timeout_work; |
Jens Axboe | 242f9dc | 2008-09-14 05:55:09 -0700 | [diff] [blame] | 430 | struct list_head timeout_list; |
| 431 | |
Tejun Heo | a612fdd | 2011-12-14 00:33:41 +0100 | [diff] [blame] | 432 | struct list_head icq_list; |
Tejun Heo | 4eef304 | 2012-03-05 13:15:18 -0800 | [diff] [blame] | 433 | #ifdef CONFIG_BLK_CGROUP |
Tejun Heo | a2b1693 | 2012-04-13 13:11:33 -0700 | [diff] [blame] | 434 | DECLARE_BITMAP (blkcg_pols, BLKCG_MAX_POLS); |
Tejun Heo | 3c79839 | 2012-04-16 13:57:25 -0700 | [diff] [blame] | 435 | struct blkcg_gq *root_blkg; |
Tejun Heo | 03aa264 | 2012-03-05 13:15:19 -0800 | [diff] [blame] | 436 | struct list_head blkg_list; |
Tejun Heo | 4eef304 | 2012-03-05 13:15:18 -0800 | [diff] [blame] | 437 | #endif |
Tejun Heo | a612fdd | 2011-12-14 00:33:41 +0100 | [diff] [blame] | 438 | |
Martin K. Petersen | 025146e | 2009-05-22 17:17:51 -0400 | [diff] [blame] | 439 | struct queue_limits limits; |
| 440 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 441 | /* |
| 442 | * sg stuff |
| 443 | */ |
| 444 | unsigned int sg_timeout; |
| 445 | unsigned int sg_reserved_size; |
Christoph Lameter | 1946089 | 2005-06-23 00:08:19 -0700 | [diff] [blame] | 446 | int node; |
Alexey Dobriyan | 6c5c934 | 2006-09-29 01:59:40 -0700 | [diff] [blame] | 447 | #ifdef CONFIG_BLK_DEV_IO_TRACE |
Jan Kara | 284dba6 | 2020-02-06 15:28:12 +0100 | [diff] [blame] | 448 | struct blk_trace __rcu *blk_trace; |
Waiman Long | b488092 | 2017-09-20 13:12:20 -0600 | [diff] [blame] | 449 | struct mutex blk_trace_mutex; |
Alexey Dobriyan | 6c5c934 | 2006-09-29 01:59:40 -0700 | [diff] [blame] | 450 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 451 | /* |
Tejun Heo | 4913efe | 2010-09-03 11:56:16 +0200 | [diff] [blame] | 452 | * for flush operations |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 453 | */ |
Ming Lei | 7c94e1c | 2014-09-25 23:23:43 +0800 | [diff] [blame] | 454 | struct blk_flush_queue *fq; |
Al Viro | 483f4af | 2006-03-18 18:34:37 -0500 | [diff] [blame] | 455 | |
Christoph Hellwig | 6fca6a6 | 2014-05-28 08:08:02 -0600 | [diff] [blame] | 456 | struct list_head requeue_list; |
| 457 | spinlock_t requeue_lock; |
Mike Snitzer | 2849450 | 2016-09-14 13:28:30 -0400 | [diff] [blame] | 458 | struct delayed_work requeue_work; |
Christoph Hellwig | 6fca6a6 | 2014-05-28 08:08:02 -0600 | [diff] [blame] | 459 | |
Al Viro | 483f4af | 2006-03-18 18:34:37 -0500 | [diff] [blame] | 460 | struct mutex sysfs_lock; |
FUJITA Tomonori | d351af0 | 2007-07-09 12:40:35 +0200 | [diff] [blame] | 461 | |
Tejun Heo | d732580 | 2012-03-05 13:14:58 -0800 | [diff] [blame] | 462 | int bypass_depth; |
Christoph Hellwig | 4ecd4fe | 2015-05-07 09:38:13 +0200 | [diff] [blame] | 463 | atomic_t mq_freeze_depth; |
Tejun Heo | d732580 | 2012-03-05 13:14:58 -0800 | [diff] [blame] | 464 | |
FUJITA Tomonori | d351af0 | 2007-07-09 12:40:35 +0200 | [diff] [blame] | 465 | #if defined(CONFIG_BLK_DEV_BSG) |
Mike Christie | aa387cc | 2011-07-31 22:05:09 +0200 | [diff] [blame] | 466 | bsg_job_fn *bsg_job_fn; |
| 467 | int bsg_job_size; |
FUJITA Tomonori | d351af0 | 2007-07-09 12:40:35 +0200 | [diff] [blame] | 468 | struct bsg_class_device bsg_dev; |
| 469 | #endif |
Vivek Goyal | e43473b | 2010-09-15 17:06:35 -0400 | [diff] [blame] | 470 | |
| 471 | #ifdef CONFIG_BLK_DEV_THROTTLING |
| 472 | /* Throttle data */ |
| 473 | struct throtl_data *td; |
| 474 | #endif |
Tejun Heo | 548bc8e | 2013-01-09 08:05:13 -0800 | [diff] [blame] | 475 | struct rcu_head rcu_head; |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 476 | wait_queue_head_t mq_freeze_wq; |
Dan Williams | 3ef28e8 | 2015-10-21 13:20:12 -0400 | [diff] [blame] | 477 | struct percpu_ref q_usage_counter; |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 478 | struct list_head all_q_node; |
Jens Axboe | 0d2602c | 2014-05-13 15:10:52 -0600 | [diff] [blame] | 479 | |
| 480 | struct blk_mq_tag_set *tag_set; |
| 481 | struct list_head tag_set_list; |
Kent Overstreet | 54efd50 | 2015-04-23 22:37:18 -0700 | [diff] [blame] | 482 | struct bio_set *bio_split; |
Akinobu Mita | 4593fdb | 2015-09-27 02:09:20 +0900 | [diff] [blame] | 483 | |
| 484 | bool mq_sysfs_init_done; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 485 | }; |
| 486 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 487 | #define QUEUE_FLAG_QUEUED 1 /* uses generic tag queueing */ |
| 488 | #define QUEUE_FLAG_STOPPED 2 /* queue is stopped */ |
Jens Axboe | 1faa16d | 2009-04-06 14:48:01 +0200 | [diff] [blame] | 489 | #define QUEUE_FLAG_SYNCFULL 3 /* read queue has been filled */ |
| 490 | #define QUEUE_FLAG_ASYNCFULL 4 /* write queue has been filled */ |
Bart Van Assche | 3f3299d | 2012-11-28 13:42:38 +0100 | [diff] [blame] | 491 | #define QUEUE_FLAG_DYING 5 /* queue being torn down */ |
Tejun Heo | d732580 | 2012-03-05 13:14:58 -0800 | [diff] [blame] | 492 | #define QUEUE_FLAG_BYPASS 6 /* act as dumb FIFO queue */ |
Jens Axboe | c21e6be | 2011-04-19 13:32:46 +0200 | [diff] [blame] | 493 | #define QUEUE_FLAG_BIDI 7 /* queue supports bidi requests */ |
| 494 | #define QUEUE_FLAG_NOMERGES 8 /* disable merge attempts */ |
Dan Williams | 5757a6d | 2011-07-23 20:44:25 +0200 | [diff] [blame] | 495 | #define QUEUE_FLAG_SAME_COMP 9 /* complete on same CPU-group */ |
Jens Axboe | c21e6be | 2011-04-19 13:32:46 +0200 | [diff] [blame] | 496 | #define QUEUE_FLAG_FAIL_IO 10 /* fake timeout */ |
| 497 | #define QUEUE_FLAG_STACKABLE 11 /* supports request stacking */ |
| 498 | #define QUEUE_FLAG_NONROT 12 /* non-rotational device (SSD) */ |
Fernando Luis Vázquez Cao | 88e740f | 2008-10-27 18:44:46 +0900 | [diff] [blame] | 499 | #define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */ |
Jens Axboe | c21e6be | 2011-04-19 13:32:46 +0200 | [diff] [blame] | 500 | #define QUEUE_FLAG_IO_STAT 13 /* do IO stats */ |
| 501 | #define QUEUE_FLAG_DISCARD 14 /* supports DISCARD */ |
| 502 | #define QUEUE_FLAG_NOXMERGES 15 /* No extended merges */ |
| 503 | #define QUEUE_FLAG_ADD_RANDOM 16 /* Contributes to random pool */ |
Christoph Hellwig | 288dab8 | 2016-06-09 16:00:36 +0200 | [diff] [blame] | 504 | #define QUEUE_FLAG_SECERASE 17 /* supports secure erase */ |
Dan Williams | 5757a6d | 2011-07-23 20:44:25 +0200 | [diff] [blame] | 505 | #define QUEUE_FLAG_SAME_FORCE 18 /* force complete on same CPU */ |
Bart Van Assche | c246e80 | 2012-12-06 14:32:01 +0100 | [diff] [blame] | 506 | #define QUEUE_FLAG_DEAD 19 /* queue tear-down finished */ |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 507 | #define QUEUE_FLAG_INIT_DONE 20 /* queue is initialized */ |
Jens Axboe | 05f1dd5 | 2014-05-29 09:53:32 -0600 | [diff] [blame] | 508 | #define QUEUE_FLAG_NO_SG_MERGE 21 /* don't attempt to merge SG segments*/ |
Jens Axboe | 05229be | 2015-11-05 10:44:55 -0700 | [diff] [blame] | 509 | #define QUEUE_FLAG_POLL 22 /* IO polling enabled if set */ |
Jens Axboe | 93e9d8e | 2016-04-12 12:32:46 -0600 | [diff] [blame] | 510 | #define QUEUE_FLAG_WC 23 /* Write back caching */ |
| 511 | #define QUEUE_FLAG_FUA 24 /* device supports FUA writes */ |
Jens Axboe | c888a8f | 2016-04-13 13:33:19 -0600 | [diff] [blame] | 512 | #define QUEUE_FLAG_FLUSH_NQ 25 /* flush not queueuable */ |
Toshi Kani | 163d4ba | 2016-06-23 17:05:50 -0400 | [diff] [blame] | 513 | #define QUEUE_FLAG_DAX 26 /* device supports DAX */ |
Jens Axboe | bc58ba9 | 2009-01-23 10:54:44 +0100 | [diff] [blame] | 514 | |
| 515 | #define QUEUE_FLAG_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \ |
Jens Axboe | 01e97f6 | 2009-09-03 20:06:47 +0200 | [diff] [blame] | 516 | (1 << QUEUE_FLAG_STACKABLE) | \ |
Jens Axboe | e2e1a14 | 2010-06-09 10:42:09 +0200 | [diff] [blame] | 517 | (1 << QUEUE_FLAG_SAME_COMP) | \ |
| 518 | (1 << QUEUE_FLAG_ADD_RANDOM)) |
Tejun Heo | 797e7db | 2006-01-06 09:51:03 +0100 | [diff] [blame] | 519 | |
Jens Axboe | 94eddfb | 2013-11-19 09:25:07 -0700 | [diff] [blame] | 520 | #define QUEUE_FLAG_MQ_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \ |
Mike Snitzer | ad9cf3b | 2014-12-16 12:54:25 -0500 | [diff] [blame] | 521 | (1 << QUEUE_FLAG_STACKABLE) | \ |
Christoph Hellwig | 8e0b60b | 2016-03-03 16:04:03 +0100 | [diff] [blame] | 522 | (1 << QUEUE_FLAG_SAME_COMP) | \ |
| 523 | (1 << QUEUE_FLAG_POLL)) |
Jens Axboe | 94eddfb | 2013-11-19 09:25:07 -0700 | [diff] [blame] | 524 | |
Andi Kleen | 8bcb6c7 | 2012-03-30 12:33:28 +0200 | [diff] [blame] | 525 | static inline void queue_lockdep_assert_held(struct request_queue *q) |
Linus Torvalds | 8f45c1a | 2008-04-29 10:16:38 -0700 | [diff] [blame] | 526 | { |
Andi Kleen | 8bcb6c7 | 2012-03-30 12:33:28 +0200 | [diff] [blame] | 527 | if (q->queue_lock) |
| 528 | lockdep_assert_held(q->queue_lock); |
Linus Torvalds | 8f45c1a | 2008-04-29 10:16:38 -0700 | [diff] [blame] | 529 | } |
| 530 | |
Nick Piggin | 75ad23b | 2008-04-29 14:48:33 +0200 | [diff] [blame] | 531 | static inline void queue_flag_set_unlocked(unsigned int flag, |
| 532 | struct request_queue *q) |
| 533 | { |
| 534 | __set_bit(flag, &q->queue_flags); |
| 535 | } |
| 536 | |
Jens Axboe | e48ec69 | 2008-07-03 13:18:54 +0200 | [diff] [blame] | 537 | static inline int queue_flag_test_and_clear(unsigned int flag, |
| 538 | struct request_queue *q) |
| 539 | { |
Andi Kleen | 8bcb6c7 | 2012-03-30 12:33:28 +0200 | [diff] [blame] | 540 | queue_lockdep_assert_held(q); |
Jens Axboe | e48ec69 | 2008-07-03 13:18:54 +0200 | [diff] [blame] | 541 | |
| 542 | if (test_bit(flag, &q->queue_flags)) { |
| 543 | __clear_bit(flag, &q->queue_flags); |
| 544 | return 1; |
| 545 | } |
| 546 | |
| 547 | return 0; |
| 548 | } |
| 549 | |
| 550 | static inline int queue_flag_test_and_set(unsigned int flag, |
| 551 | struct request_queue *q) |
| 552 | { |
Andi Kleen | 8bcb6c7 | 2012-03-30 12:33:28 +0200 | [diff] [blame] | 553 | queue_lockdep_assert_held(q); |
Jens Axboe | e48ec69 | 2008-07-03 13:18:54 +0200 | [diff] [blame] | 554 | |
| 555 | if (!test_bit(flag, &q->queue_flags)) { |
| 556 | __set_bit(flag, &q->queue_flags); |
| 557 | return 0; |
| 558 | } |
| 559 | |
| 560 | return 1; |
| 561 | } |
| 562 | |
Nick Piggin | 75ad23b | 2008-04-29 14:48:33 +0200 | [diff] [blame] | 563 | static inline void queue_flag_set(unsigned int flag, struct request_queue *q) |
| 564 | { |
Andi Kleen | 8bcb6c7 | 2012-03-30 12:33:28 +0200 | [diff] [blame] | 565 | queue_lockdep_assert_held(q); |
Nick Piggin | 75ad23b | 2008-04-29 14:48:33 +0200 | [diff] [blame] | 566 | __set_bit(flag, &q->queue_flags); |
| 567 | } |
| 568 | |
| 569 | static inline void queue_flag_clear_unlocked(unsigned int flag, |
| 570 | struct request_queue *q) |
| 571 | { |
| 572 | __clear_bit(flag, &q->queue_flags); |
| 573 | } |
| 574 | |
Jens Axboe | 0a7ae2f | 2009-05-20 08:54:31 +0200 | [diff] [blame] | 575 | static inline int queue_in_flight(struct request_queue *q) |
| 576 | { |
| 577 | return q->in_flight[0] + q->in_flight[1]; |
| 578 | } |
| 579 | |
Nick Piggin | 75ad23b | 2008-04-29 14:48:33 +0200 | [diff] [blame] | 580 | static inline void queue_flag_clear(unsigned int flag, struct request_queue *q) |
| 581 | { |
Andi Kleen | 8bcb6c7 | 2012-03-30 12:33:28 +0200 | [diff] [blame] | 582 | queue_lockdep_assert_held(q); |
Nick Piggin | 75ad23b | 2008-04-29 14:48:33 +0200 | [diff] [blame] | 583 | __clear_bit(flag, &q->queue_flags); |
| 584 | } |
| 585 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 586 | #define blk_queue_tagged(q) test_bit(QUEUE_FLAG_QUEUED, &(q)->queue_flags) |
| 587 | #define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags) |
Bart Van Assche | 3f3299d | 2012-11-28 13:42:38 +0100 | [diff] [blame] | 588 | #define blk_queue_dying(q) test_bit(QUEUE_FLAG_DYING, &(q)->queue_flags) |
Bart Van Assche | c246e80 | 2012-12-06 14:32:01 +0100 | [diff] [blame] | 589 | #define blk_queue_dead(q) test_bit(QUEUE_FLAG_DEAD, &(q)->queue_flags) |
Tejun Heo | d732580 | 2012-03-05 13:14:58 -0800 | [diff] [blame] | 590 | #define blk_queue_bypass(q) test_bit(QUEUE_FLAG_BYPASS, &(q)->queue_flags) |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 591 | #define blk_queue_init_done(q) test_bit(QUEUE_FLAG_INIT_DONE, &(q)->queue_flags) |
Alan D. Brunelle | ac9fafa | 2008-04-29 14:44:19 +0200 | [diff] [blame] | 592 | #define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags) |
Alan D. Brunelle | 488991e | 2010-01-29 09:04:08 +0100 | [diff] [blame] | 593 | #define blk_queue_noxmerges(q) \ |
| 594 | test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags) |
Jens Axboe | a68bbdd | 2008-09-24 13:03:33 +0200 | [diff] [blame] | 595 | #define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags) |
Jens Axboe | bc58ba9 | 2009-01-23 10:54:44 +0100 | [diff] [blame] | 596 | #define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags) |
Jens Axboe | e2e1a14 | 2010-06-09 10:42:09 +0200 | [diff] [blame] | 597 | #define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags) |
Kiyoshi Ueda | 4ee5eaf | 2008-09-18 10:46:13 -0400 | [diff] [blame] | 598 | #define blk_queue_stackable(q) \ |
| 599 | test_bit(QUEUE_FLAG_STACKABLE, &(q)->queue_flags) |
Christoph Hellwig | c15227d | 2009-09-30 13:52:12 +0200 | [diff] [blame] | 600 | #define blk_queue_discard(q) test_bit(QUEUE_FLAG_DISCARD, &(q)->queue_flags) |
Christoph Hellwig | 288dab8 | 2016-06-09 16:00:36 +0200 | [diff] [blame] | 601 | #define blk_queue_secure_erase(q) \ |
| 602 | (test_bit(QUEUE_FLAG_SECERASE, &(q)->queue_flags)) |
Toshi Kani | 163d4ba | 2016-06-23 17:05:50 -0400 | [diff] [blame] | 603 | #define blk_queue_dax(q) test_bit(QUEUE_FLAG_DAX, &(q)->queue_flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 604 | |
Christoph Hellwig | 33659eb | 2010-08-07 18:17:56 +0200 | [diff] [blame] | 605 | #define blk_noretry_request(rq) \ |
| 606 | ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \ |
| 607 | REQ_FAILFAST_DRIVER)) |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 608 | |
Christoph Hellwig | 33659eb | 2010-08-07 18:17:56 +0200 | [diff] [blame] | 609 | #define blk_account_rq(rq) \ |
| 610 | (((rq)->cmd_flags & REQ_STARTED) && \ |
Martin K. Petersen | e2a60da | 2012-09-18 12:19:25 -0400 | [diff] [blame] | 611 | ((rq)->cmd_type == REQ_TYPE_FS)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 612 | |
Jens Axboe | ab780f1 | 2008-08-26 10:25:02 +0200 | [diff] [blame] | 613 | #define blk_rq_cpu_valid(rq) ((rq)->cpu != -1) |
FUJITA Tomonori | abae1fd | 2007-07-16 08:52:14 +0200 | [diff] [blame] | 614 | #define blk_bidi_rq(rq) ((rq)->next_rq != NULL) |
Kiyoshi Ueda | 336cdb4 | 2007-12-11 17:40:30 -0500 | [diff] [blame] | 615 | /* rq->queuelist of dequeued request must be list_empty() */ |
| 616 | #define blk_queued_rq(rq) (!list_empty(&(rq)->queuelist)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 617 | |
| 618 | #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist) |
| 619 | |
Mike Christie | 4e1b2d52 | 2016-06-05 14:32:22 -0500 | [diff] [blame] | 620 | #define rq_data_dir(rq) (op_is_write(req_op(rq)) ? WRITE : READ) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 621 | |
Jens Axboe | 49fd524 | 2014-04-16 10:57:18 -0600 | [diff] [blame] | 622 | /* |
| 623 | * Driver can handle struct request, if it either has an old style |
| 624 | * request_fn defined, or is blk-mq based. |
| 625 | */ |
| 626 | static inline bool queue_is_rq_based(struct request_queue *q) |
| 627 | { |
| 628 | return q->request_fn || q->mq_ops; |
| 629 | } |
| 630 | |
Martin K. Petersen | e692cb6 | 2010-12-01 19:41:49 +0100 | [diff] [blame] | 631 | static inline unsigned int blk_queue_cluster(struct request_queue *q) |
| 632 | { |
| 633 | return q->limits.cluster; |
| 634 | } |
| 635 | |
Jens Axboe | 9e2585a | 2006-07-28 09:26:13 +0200 | [diff] [blame] | 636 | /* |
Jens Axboe | 1faa16d | 2009-04-06 14:48:01 +0200 | [diff] [blame] | 637 | * We regard a request as sync, if either a read or a sync write |
Jens Axboe | 9e2585a | 2006-07-28 09:26:13 +0200 | [diff] [blame] | 638 | */ |
Mike Christie | d9d8c5c | 2016-06-05 14:32:16 -0500 | [diff] [blame] | 639 | static inline bool rw_is_sync(int op, unsigned int rw_flags) |
Jens Axboe | 1faa16d | 2009-04-06 14:48:01 +0200 | [diff] [blame] | 640 | { |
Mike Christie | d9d8c5c | 2016-06-05 14:32:16 -0500 | [diff] [blame] | 641 | return op == REQ_OP_READ || (rw_flags & REQ_SYNC); |
Jens Axboe | 1faa16d | 2009-04-06 14:48:01 +0200 | [diff] [blame] | 642 | } |
| 643 | |
| 644 | static inline bool rq_is_sync(struct request *rq) |
| 645 | { |
Mike Christie | d9d8c5c | 2016-06-05 14:32:16 -0500 | [diff] [blame] | 646 | return rw_is_sync(req_op(rq), rq->cmd_flags); |
Jens Axboe | 1faa16d | 2009-04-06 14:48:01 +0200 | [diff] [blame] | 647 | } |
| 648 | |
Tejun Heo | 5b788ce | 2012-06-04 20:40:59 -0700 | [diff] [blame] | 649 | static inline bool blk_rl_full(struct request_list *rl, bool sync) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 650 | { |
Tejun Heo | 5b788ce | 2012-06-04 20:40:59 -0700 | [diff] [blame] | 651 | unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL; |
| 652 | |
| 653 | return rl->flags & flag; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 654 | } |
| 655 | |
Tejun Heo | 5b788ce | 2012-06-04 20:40:59 -0700 | [diff] [blame] | 656 | static inline void blk_set_rl_full(struct request_list *rl, bool sync) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 657 | { |
Tejun Heo | 5b788ce | 2012-06-04 20:40:59 -0700 | [diff] [blame] | 658 | unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL; |
| 659 | |
| 660 | rl->flags |= flag; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 661 | } |
| 662 | |
Tejun Heo | 5b788ce | 2012-06-04 20:40:59 -0700 | [diff] [blame] | 663 | static inline void blk_clear_rl_full(struct request_list *rl, bool sync) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 664 | { |
Tejun Heo | 5b788ce | 2012-06-04 20:40:59 -0700 | [diff] [blame] | 665 | unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL; |
| 666 | |
| 667 | rl->flags &= ~flag; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 668 | } |
| 669 | |
Martin K. Petersen | e2a60da | 2012-09-18 12:19:25 -0400 | [diff] [blame] | 670 | static inline bool rq_mergeable(struct request *rq) |
| 671 | { |
Christoph Hellwig | f321624 | 2017-01-31 16:57:29 +0100 | [diff] [blame] | 672 | if (blk_rq_is_passthrough(rq)) |
Martin K. Petersen | e2a60da | 2012-09-18 12:19:25 -0400 | [diff] [blame] | 673 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 674 | |
Mike Christie | 3a5e02c | 2016-06-05 14:32:23 -0500 | [diff] [blame] | 675 | if (req_op(rq) == REQ_OP_FLUSH) |
| 676 | return false; |
| 677 | |
Martin K. Petersen | e2a60da | 2012-09-18 12:19:25 -0400 | [diff] [blame] | 678 | if (rq->cmd_flags & REQ_NOMERGE_FLAGS) |
| 679 | return false; |
| 680 | |
| 681 | return true; |
| 682 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 683 | |
Martin K. Petersen | 4363ac7 | 2012-09-18 12:19:27 -0400 | [diff] [blame] | 684 | static inline bool blk_write_same_mergeable(struct bio *a, struct bio *b) |
| 685 | { |
| 686 | if (bio_data(a) == bio_data(b)) |
| 687 | return true; |
| 688 | |
| 689 | return false; |
| 690 | } |
| 691 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 692 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 693 | * q->prep_rq_fn return values |
| 694 | */ |
Martin K. Petersen | 0fb5b1f | 2016-02-04 00:52:12 -0500 | [diff] [blame] | 695 | enum { |
| 696 | BLKPREP_OK, /* serve it */ |
| 697 | BLKPREP_KILL, /* fatal error, kill, return -EIO */ |
| 698 | BLKPREP_DEFER, /* leave on queue */ |
| 699 | BLKPREP_INVALID, /* invalid command, kill, return -EREMOTEIO */ |
| 700 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 701 | |
| 702 | extern unsigned long blk_max_low_pfn, blk_max_pfn; |
| 703 | |
| 704 | /* |
| 705 | * standard bounce addresses: |
| 706 | * |
| 707 | * BLK_BOUNCE_HIGH : bounce all highmem pages |
| 708 | * BLK_BOUNCE_ANY : don't bounce anything |
| 709 | * BLK_BOUNCE_ISA : bounce pages above ISA DMA boundary |
| 710 | */ |
Andi Kleen | 2472892 | 2008-04-21 09:51:05 +0200 | [diff] [blame] | 711 | |
| 712 | #if BITS_PER_LONG == 32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 713 | #define BLK_BOUNCE_HIGH ((u64)blk_max_low_pfn << PAGE_SHIFT) |
Andi Kleen | 2472892 | 2008-04-21 09:51:05 +0200 | [diff] [blame] | 714 | #else |
| 715 | #define BLK_BOUNCE_HIGH -1ULL |
| 716 | #endif |
| 717 | #define BLK_BOUNCE_ANY (-1ULL) |
FUJITA Tomonori | bfe1723 | 2010-05-31 15:59:03 +0900 | [diff] [blame] | 718 | #define BLK_BOUNCE_ISA (DMA_BIT_MASK(24)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 719 | |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 720 | /* |
| 721 | * default timeout for SG_IO if none specified |
| 722 | */ |
| 723 | #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ) |
Linus Torvalds | f2f1fa7 | 2008-12-05 14:49:18 -0800 | [diff] [blame] | 724 | #define BLK_MIN_SG_TIMEOUT (7 * HZ) |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 725 | |
Christoph Lameter | 2a7326b | 2007-07-17 04:03:37 -0700 | [diff] [blame] | 726 | #ifdef CONFIG_BOUNCE |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 727 | extern int init_emergency_isa_pool(void); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 728 | extern void blk_queue_bounce(struct request_queue *q, struct bio **bio); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 729 | #else |
| 730 | static inline int init_emergency_isa_pool(void) |
| 731 | { |
| 732 | return 0; |
| 733 | } |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 734 | static inline void blk_queue_bounce(struct request_queue *q, struct bio **bio) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 735 | { |
| 736 | } |
| 737 | #endif /* CONFIG_MMU */ |
| 738 | |
FUJITA Tomonori | 152e283 | 2008-08-28 16:17:06 +0900 | [diff] [blame] | 739 | struct rq_map_data { |
| 740 | struct page **pages; |
| 741 | int page_order; |
| 742 | int nr_entries; |
FUJITA Tomonori | 56c451f | 2008-12-18 14:49:37 +0900 | [diff] [blame] | 743 | unsigned long offset; |
FUJITA Tomonori | 97ae77a | 2008-12-18 14:49:38 +0900 | [diff] [blame] | 744 | int null_mapped; |
FUJITA Tomonori | ecb554a | 2009-07-09 14:46:53 +0200 | [diff] [blame] | 745 | int from_user; |
FUJITA Tomonori | 152e283 | 2008-08-28 16:17:06 +0900 | [diff] [blame] | 746 | }; |
| 747 | |
NeilBrown | 5705f70 | 2007-09-25 12:35:59 +0200 | [diff] [blame] | 748 | struct req_iterator { |
Kent Overstreet | 7988613 | 2013-11-23 17:19:00 -0800 | [diff] [blame] | 749 | struct bvec_iter iter; |
NeilBrown | 5705f70 | 2007-09-25 12:35:59 +0200 | [diff] [blame] | 750 | struct bio *bio; |
| 751 | }; |
| 752 | |
| 753 | /* This should not be used directly - use rq_for_each_segment */ |
Jens Axboe | 1e42807 | 2009-02-23 09:03:10 +0100 | [diff] [blame] | 754 | #define for_each_bio(_bio) \ |
| 755 | for (; _bio; _bio = _bio->bi_next) |
NeilBrown | 5705f70 | 2007-09-25 12:35:59 +0200 | [diff] [blame] | 756 | #define __rq_for_each_bio(_bio, rq) \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 757 | if ((rq->bio)) \ |
| 758 | for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next) |
| 759 | |
NeilBrown | 5705f70 | 2007-09-25 12:35:59 +0200 | [diff] [blame] | 760 | #define rq_for_each_segment(bvl, _rq, _iter) \ |
| 761 | __rq_for_each_bio(_iter.bio, _rq) \ |
Kent Overstreet | 7988613 | 2013-11-23 17:19:00 -0800 | [diff] [blame] | 762 | bio_for_each_segment(bvl, _iter.bio, _iter.iter) |
NeilBrown | 5705f70 | 2007-09-25 12:35:59 +0200 | [diff] [blame] | 763 | |
Kent Overstreet | 4550dd6 | 2013-08-07 14:26:21 -0700 | [diff] [blame] | 764 | #define rq_iter_last(bvec, _iter) \ |
Kent Overstreet | 7988613 | 2013-11-23 17:19:00 -0800 | [diff] [blame] | 765 | (_iter.bio->bi_next == NULL && \ |
Kent Overstreet | 4550dd6 | 2013-08-07 14:26:21 -0700 | [diff] [blame] | 766 | bio_iter_last(bvec, _iter.iter)) |
NeilBrown | 5705f70 | 2007-09-25 12:35:59 +0200 | [diff] [blame] | 767 | |
Ilya Loginov | 2d4dc89 | 2009-11-26 09:16:19 +0100 | [diff] [blame] | 768 | #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE |
| 769 | # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform" |
| 770 | #endif |
| 771 | #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE |
| 772 | extern void rq_flush_dcache_pages(struct request *rq); |
| 773 | #else |
| 774 | static inline void rq_flush_dcache_pages(struct request *rq) |
| 775 | { |
| 776 | } |
| 777 | #endif |
| 778 | |
Toshi Kani | 2af3a81 | 2016-05-10 10:23:52 -0600 | [diff] [blame] | 779 | #ifdef CONFIG_PRINTK |
| 780 | #define vfs_msg(sb, level, fmt, ...) \ |
| 781 | __vfs_msg(sb, level, fmt, ##__VA_ARGS__) |
| 782 | #else |
| 783 | #define vfs_msg(sb, level, fmt, ...) \ |
| 784 | do { \ |
| 785 | no_printk(fmt, ##__VA_ARGS__); \ |
| 786 | __vfs_msg(sb, "", " "); \ |
| 787 | } while (0) |
| 788 | #endif |
| 789 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 790 | extern int blk_register_queue(struct gendisk *disk); |
| 791 | extern void blk_unregister_queue(struct gendisk *disk); |
Jens Axboe | dece163 | 2015-11-05 10:41:16 -0700 | [diff] [blame] | 792 | extern blk_qc_t generic_make_request(struct bio *bio); |
FUJITA Tomonori | 2a4aa30 | 2008-04-29 09:54:36 +0200 | [diff] [blame] | 793 | extern void blk_rq_init(struct request_queue *q, struct request *rq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 794 | extern void blk_put_request(struct request *); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 795 | extern void __blk_put_request(struct request_queue *, struct request *); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 796 | extern struct request *blk_get_request(struct request_queue *, int, gfp_t); |
Jens Axboe | f27b087 | 2014-06-06 07:57:37 -0600 | [diff] [blame] | 797 | extern void blk_rq_set_block_pc(struct request *); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 798 | extern void blk_requeue_request(struct request_queue *, struct request *); |
Christoph Hellwig | 66ac028 | 2010-06-18 16:59:42 +0200 | [diff] [blame] | 799 | extern void blk_add_request_payload(struct request *rq, struct page *page, |
Ming Lin | 37e5823 | 2016-03-22 00:24:44 -0700 | [diff] [blame] | 800 | int offset, unsigned int len); |
Kiyoshi Ueda | ef9e3fa | 2008-10-01 16:12:15 +0200 | [diff] [blame] | 801 | extern int blk_lld_busy(struct request_queue *q); |
Mike Snitzer | 78d8e58 | 2015-06-26 10:01:13 -0400 | [diff] [blame] | 802 | extern int blk_rq_prep_clone(struct request *rq, struct request *rq_src, |
| 803 | struct bio_set *bs, gfp_t gfp_mask, |
| 804 | int (*bio_ctr)(struct bio *, struct bio *, void *), |
| 805 | void *data); |
| 806 | extern void blk_rq_unprep_clone(struct request *rq); |
Kiyoshi Ueda | 82124d6 | 2008-09-18 10:45:38 -0400 | [diff] [blame] | 807 | extern int blk_insert_cloned_request(struct request_queue *q, |
| 808 | struct request *rq); |
Christoph Hellwig | 98d61d5 | 2016-07-19 11:31:51 +0200 | [diff] [blame] | 809 | extern int blk_rq_append_bio(struct request *rq, struct bio *bio); |
Jens Axboe | 3cca6dc | 2011-03-02 11:08:00 -0500 | [diff] [blame] | 810 | extern void blk_delay_queue(struct request_queue *, unsigned long); |
Kent Overstreet | 54efd50 | 2015-04-23 22:37:18 -0700 | [diff] [blame] | 811 | extern void blk_queue_split(struct request_queue *, struct bio **, |
| 812 | struct bio_set *); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 813 | extern void blk_recount_segments(struct request_queue *, struct bio *); |
Paolo Bonzini | 0bfc96c | 2012-01-12 16:01:28 +0100 | [diff] [blame] | 814 | extern int scsi_verify_blk_ioctl(struct block_device *, unsigned int); |
Paolo Bonzini | 577ebb3 | 2012-01-12 16:01:27 +0100 | [diff] [blame] | 815 | extern int scsi_cmd_blk_ioctl(struct block_device *, fmode_t, |
| 816 | unsigned int, void __user *); |
Al Viro | 74f3c8a | 2007-08-27 15:38:10 -0400 | [diff] [blame] | 817 | extern int scsi_cmd_ioctl(struct request_queue *, struct gendisk *, fmode_t, |
| 818 | unsigned int, void __user *); |
Al Viro | e915e87 | 2008-09-02 17:16:41 -0400 | [diff] [blame] | 819 | extern int sg_scsi_ioctl(struct request_queue *, struct gendisk *, fmode_t, |
| 820 | struct scsi_ioctl_command __user *); |
Andrew Morton | 3fcfab1 | 2006-10-19 23:28:16 -0700 | [diff] [blame] | 821 | |
Christoph Hellwig | 6f3b0e8 | 2015-11-26 09:13:05 +0100 | [diff] [blame] | 822 | extern int blk_queue_enter(struct request_queue *q, bool nowait); |
Dan Williams | 2e6edc9 | 2015-11-19 13:29:28 -0800 | [diff] [blame] | 823 | extern void blk_queue_exit(struct request_queue *q); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 824 | extern void blk_start_queue(struct request_queue *q); |
Jens Axboe | 2149141 | 2015-12-28 13:01:22 -0700 | [diff] [blame] | 825 | extern void blk_start_queue_async(struct request_queue *q); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 826 | extern void blk_stop_queue(struct request_queue *q); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 827 | extern void blk_sync_queue(struct request_queue *q); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 828 | extern void __blk_stop_queue(struct request_queue *q); |
Christoph Hellwig | 24ecfbe | 2011-04-18 11:41:33 +0200 | [diff] [blame] | 829 | extern void __blk_run_queue(struct request_queue *q); |
Christoph Hellwig | a7928c1 | 2015-04-17 22:37:20 +0200 | [diff] [blame] | 830 | extern void __blk_run_queue_uncond(struct request_queue *q); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 831 | extern void blk_run_queue(struct request_queue *); |
Jens Axboe | c21e6be | 2011-04-19 13:32:46 +0200 | [diff] [blame] | 832 | extern void blk_run_queue_async(struct request_queue *q); |
FUJITA Tomonori | a3bce90 | 2008-08-28 16:17:05 +0900 | [diff] [blame] | 833 | extern int blk_rq_map_user(struct request_queue *, struct request *, |
FUJITA Tomonori | 152e283 | 2008-08-28 16:17:06 +0900 | [diff] [blame] | 834 | struct rq_map_data *, void __user *, unsigned long, |
| 835 | gfp_t); |
Jens Axboe | 8e5cfc4 | 2006-12-19 11:12:46 +0100 | [diff] [blame] | 836 | extern int blk_rq_unmap_user(struct bio *); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 837 | extern int blk_rq_map_kern(struct request_queue *, struct request *, void *, unsigned int, gfp_t); |
| 838 | extern int blk_rq_map_user_iov(struct request_queue *, struct request *, |
Kent Overstreet | 26e49cf | 2015-01-18 16:16:31 +0100 | [diff] [blame] | 839 | struct rq_map_data *, const struct iov_iter *, |
| 840 | gfp_t); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 841 | extern int blk_execute_rq(struct request_queue *, struct gendisk *, |
James Bottomley | 994ca9a | 2005-06-20 14:11:09 +0200 | [diff] [blame] | 842 | struct request *, int); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 843 | extern void blk_execute_rq_nowait(struct request_queue *, struct gendisk *, |
Jens Axboe | 15fc858 | 2006-01-06 10:00:50 +0100 | [diff] [blame] | 844 | struct request *, int, rq_end_io_fn *); |
Mike Christie | 6e39b69e | 2005-11-11 05:30:24 -0600 | [diff] [blame] | 845 | |
Jens Axboe | 05229be | 2015-11-05 10:44:55 -0700 | [diff] [blame] | 846 | bool blk_poll(struct request_queue *q, blk_qc_t cookie); |
| 847 | |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 848 | static inline struct request_queue *bdev_get_queue(struct block_device *bdev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 849 | { |
Tejun Heo | ff9ea32 | 2014-09-08 08:03:56 +0900 | [diff] [blame] | 850 | return bdev->bd_disk->queue; /* this is never NULL */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 851 | } |
| 852 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 853 | /* |
Bart Van Assche | d24c407 | 2018-03-14 15:48:06 -0700 | [diff] [blame] | 854 | * The basic unit of block I/O is a sector. It is used in a number of contexts |
| 855 | * in Linux (blk, bio, genhd). The size of one sector is 512 = 2**9 |
| 856 | * bytes. Variables of type sector_t represent an offset or size that is a |
| 857 | * multiple of 512 bytes. Hence these two constants. |
| 858 | */ |
| 859 | #ifndef SECTOR_SHIFT |
| 860 | #define SECTOR_SHIFT 9 |
| 861 | #endif |
| 862 | #ifndef SECTOR_SIZE |
| 863 | #define SECTOR_SIZE (1 << SECTOR_SHIFT) |
| 864 | #endif |
| 865 | |
| 866 | /* |
Tejun Heo | 80a761f | 2009-07-03 17:48:17 +0900 | [diff] [blame] | 867 | * blk_rq_pos() : the current sector |
| 868 | * blk_rq_bytes() : bytes left in the entire request |
| 869 | * blk_rq_cur_bytes() : bytes left in the current segment |
| 870 | * blk_rq_err_bytes() : bytes left till the next error boundary |
| 871 | * blk_rq_sectors() : sectors left in the entire request |
| 872 | * blk_rq_cur_sectors() : sectors left in the current segment |
Tejun Heo | 5efccd1 | 2009-04-23 11:05:18 +0900 | [diff] [blame] | 873 | */ |
Tejun Heo | 5b93629 | 2009-05-07 22:24:38 +0900 | [diff] [blame] | 874 | static inline sector_t blk_rq_pos(const struct request *rq) |
| 875 | { |
Tejun Heo | a2dec7b | 2009-05-07 22:24:44 +0900 | [diff] [blame] | 876 | return rq->__sector; |
Tejun Heo | 5b93629 | 2009-05-07 22:24:38 +0900 | [diff] [blame] | 877 | } |
| 878 | |
Tejun Heo | 2e46e8b | 2009-05-07 22:24:41 +0900 | [diff] [blame] | 879 | static inline unsigned int blk_rq_bytes(const struct request *rq) |
| 880 | { |
Tejun Heo | a2dec7b | 2009-05-07 22:24:44 +0900 | [diff] [blame] | 881 | return rq->__data_len; |
Tejun Heo | 2e46e8b | 2009-05-07 22:24:41 +0900 | [diff] [blame] | 882 | } |
| 883 | |
| 884 | static inline int blk_rq_cur_bytes(const struct request *rq) |
| 885 | { |
| 886 | return rq->bio ? bio_cur_bytes(rq->bio) : 0; |
| 887 | } |
Tejun Heo | 5efccd1 | 2009-04-23 11:05:18 +0900 | [diff] [blame] | 888 | |
Tejun Heo | 80a761f | 2009-07-03 17:48:17 +0900 | [diff] [blame] | 889 | extern unsigned int blk_rq_err_bytes(const struct request *rq); |
| 890 | |
Tejun Heo | 5b93629 | 2009-05-07 22:24:38 +0900 | [diff] [blame] | 891 | static inline unsigned int blk_rq_sectors(const struct request *rq) |
| 892 | { |
Bart Van Assche | d24c407 | 2018-03-14 15:48:06 -0700 | [diff] [blame] | 893 | return blk_rq_bytes(rq) >> SECTOR_SHIFT; |
Tejun Heo | 5b93629 | 2009-05-07 22:24:38 +0900 | [diff] [blame] | 894 | } |
| 895 | |
| 896 | static inline unsigned int blk_rq_cur_sectors(const struct request *rq) |
| 897 | { |
Bart Van Assche | d24c407 | 2018-03-14 15:48:06 -0700 | [diff] [blame] | 898 | return blk_rq_cur_bytes(rq) >> SECTOR_SHIFT; |
Tejun Heo | 5b93629 | 2009-05-07 22:24:38 +0900 | [diff] [blame] | 899 | } |
| 900 | |
Martin K. Petersen | f31dc1c | 2012-09-18 12:19:26 -0400 | [diff] [blame] | 901 | static inline unsigned int blk_queue_get_max_sectors(struct request_queue *q, |
Mike Christie | 8fe0d47 | 2016-06-05 14:32:15 -0500 | [diff] [blame] | 902 | int op) |
Martin K. Petersen | f31dc1c | 2012-09-18 12:19:26 -0400 | [diff] [blame] | 903 | { |
Adrian Hunter | 7afafc8 | 2016-08-16 10:59:35 +0300 | [diff] [blame] | 904 | if (unlikely(op == REQ_OP_DISCARD || op == REQ_OP_SECURE_ERASE)) |
Bart Van Assche | d24c407 | 2018-03-14 15:48:06 -0700 | [diff] [blame] | 905 | return min(q->limits.max_discard_sectors, |
| 906 | UINT_MAX >> SECTOR_SHIFT); |
Martin K. Petersen | f31dc1c | 2012-09-18 12:19:26 -0400 | [diff] [blame] | 907 | |
Mike Christie | 8fe0d47 | 2016-06-05 14:32:15 -0500 | [diff] [blame] | 908 | if (unlikely(op == REQ_OP_WRITE_SAME)) |
Martin K. Petersen | 4363ac7 | 2012-09-18 12:19:27 -0400 | [diff] [blame] | 909 | return q->limits.max_write_same_sectors; |
| 910 | |
Martin K. Petersen | f31dc1c | 2012-09-18 12:19:26 -0400 | [diff] [blame] | 911 | return q->limits.max_sectors; |
| 912 | } |
| 913 | |
Jens Axboe | 762380a | 2014-06-05 13:38:39 -0600 | [diff] [blame] | 914 | /* |
| 915 | * Return maximum size of a request at given offset. Only valid for |
| 916 | * file system requests. |
| 917 | */ |
| 918 | static inline unsigned int blk_max_size_offset(struct request_queue *q, |
| 919 | sector_t offset) |
| 920 | { |
| 921 | if (!q->limits.chunk_sectors) |
Jens Axboe | 736ed4d | 2014-06-17 22:09:29 -0700 | [diff] [blame] | 922 | return q->limits.max_sectors; |
Jens Axboe | 762380a | 2014-06-05 13:38:39 -0600 | [diff] [blame] | 923 | |
Keith Busch | 17057c5 | 2018-06-26 09:14:58 -0600 | [diff] [blame] | 924 | return min(q->limits.max_sectors, (unsigned int)(q->limits.chunk_sectors - |
| 925 | (offset & (q->limits.chunk_sectors - 1)))); |
Jens Axboe | 762380a | 2014-06-05 13:38:39 -0600 | [diff] [blame] | 926 | } |
| 927 | |
Damien Le Moal | 17007f3 | 2016-07-20 21:40:47 -0600 | [diff] [blame] | 928 | static inline unsigned int blk_rq_get_max_sectors(struct request *rq, |
| 929 | sector_t offset) |
Martin K. Petersen | f31dc1c | 2012-09-18 12:19:26 -0400 | [diff] [blame] | 930 | { |
| 931 | struct request_queue *q = rq->q; |
| 932 | |
Christoph Hellwig | f321624 | 2017-01-31 16:57:29 +0100 | [diff] [blame] | 933 | if (blk_rq_is_passthrough(rq)) |
Martin K. Petersen | f31dc1c | 2012-09-18 12:19:26 -0400 | [diff] [blame] | 934 | return q->limits.max_hw_sectors; |
| 935 | |
Adrian Hunter | 7afafc8 | 2016-08-16 10:59:35 +0300 | [diff] [blame] | 936 | if (!q->limits.chunk_sectors || |
| 937 | req_op(rq) == REQ_OP_DISCARD || |
| 938 | req_op(rq) == REQ_OP_SECURE_ERASE) |
Mike Christie | 8fe0d47 | 2016-06-05 14:32:15 -0500 | [diff] [blame] | 939 | return blk_queue_get_max_sectors(q, req_op(rq)); |
Jens Axboe | 762380a | 2014-06-05 13:38:39 -0600 | [diff] [blame] | 940 | |
Damien Le Moal | 17007f3 | 2016-07-20 21:40:47 -0600 | [diff] [blame] | 941 | return min(blk_max_size_offset(q, offset), |
Mike Christie | 8fe0d47 | 2016-06-05 14:32:15 -0500 | [diff] [blame] | 942 | blk_queue_get_max_sectors(q, req_op(rq))); |
Martin K. Petersen | f31dc1c | 2012-09-18 12:19:26 -0400 | [diff] [blame] | 943 | } |
| 944 | |
Jun'ichi Nomura | 75afb35 | 2013-09-21 13:57:47 -0600 | [diff] [blame] | 945 | static inline unsigned int blk_rq_count_bios(struct request *rq) |
| 946 | { |
| 947 | unsigned int nr_bios = 0; |
| 948 | struct bio *bio; |
| 949 | |
| 950 | __rq_for_each_bio(bio, rq) |
| 951 | nr_bios++; |
| 952 | |
| 953 | return nr_bios; |
| 954 | } |
| 955 | |
Tejun Heo | 5efccd1 | 2009-04-23 11:05:18 +0900 | [diff] [blame] | 956 | /* |
Tejun Heo | 9934c8c | 2009-05-08 11:54:16 +0900 | [diff] [blame] | 957 | * Request issue related functions. |
| 958 | */ |
| 959 | extern struct request *blk_peek_request(struct request_queue *q); |
| 960 | extern void blk_start_request(struct request *rq); |
| 961 | extern struct request *blk_fetch_request(struct request_queue *q); |
| 962 | |
| 963 | /* |
Tejun Heo | 2e60e02 | 2009-04-23 11:05:18 +0900 | [diff] [blame] | 964 | * Request completion related functions. |
| 965 | * |
| 966 | * blk_update_request() completes given number of bytes and updates |
| 967 | * the request without completing it. |
| 968 | * |
Tejun Heo | f06d9a2 | 2009-04-23 11:05:19 +0900 | [diff] [blame] | 969 | * blk_end_request() and friends. __blk_end_request() must be called |
| 970 | * with the request queue spinlock acquired. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 971 | * |
| 972 | * Several drivers define their own end_request and call |
Kiyoshi Ueda | 3bcddea | 2007-12-11 17:52:28 -0500 | [diff] [blame] | 973 | * blk_end_request() for parts of the original function. |
| 974 | * This prevents code duplication in drivers. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 975 | */ |
Tejun Heo | 2e60e02 | 2009-04-23 11:05:18 +0900 | [diff] [blame] | 976 | extern bool blk_update_request(struct request *rq, int error, |
| 977 | unsigned int nr_bytes); |
Christoph Hellwig | 1212007 | 2014-04-16 09:44:59 +0200 | [diff] [blame] | 978 | extern void blk_finish_request(struct request *rq, int error); |
FUJITA Tomonori | b1f7449 | 2009-05-11 17:56:09 +0900 | [diff] [blame] | 979 | extern bool blk_end_request(struct request *rq, int error, |
| 980 | unsigned int nr_bytes); |
| 981 | extern void blk_end_request_all(struct request *rq, int error); |
| 982 | extern bool blk_end_request_cur(struct request *rq, int error); |
Tejun Heo | 80a761f | 2009-07-03 17:48:17 +0900 | [diff] [blame] | 983 | extern bool blk_end_request_err(struct request *rq, int error); |
FUJITA Tomonori | b1f7449 | 2009-05-11 17:56:09 +0900 | [diff] [blame] | 984 | extern bool __blk_end_request(struct request *rq, int error, |
| 985 | unsigned int nr_bytes); |
| 986 | extern void __blk_end_request_all(struct request *rq, int error); |
| 987 | extern bool __blk_end_request_cur(struct request *rq, int error); |
Tejun Heo | 80a761f | 2009-07-03 17:48:17 +0900 | [diff] [blame] | 988 | extern bool __blk_end_request_err(struct request *rq, int error); |
Tejun Heo | 2e60e02 | 2009-04-23 11:05:18 +0900 | [diff] [blame] | 989 | |
Jens Axboe | ff856ba | 2006-01-09 16:02:34 +0100 | [diff] [blame] | 990 | extern void blk_complete_request(struct request *); |
Jens Axboe | 242f9dc | 2008-09-14 05:55:09 -0700 | [diff] [blame] | 991 | extern void __blk_complete_request(struct request *); |
| 992 | extern void blk_abort_request(struct request *); |
James Bottomley | 28018c2 | 2010-07-01 19:49:17 +0900 | [diff] [blame] | 993 | extern void blk_unprep_request(struct request *); |
Jens Axboe | ff856ba | 2006-01-09 16:02:34 +0100 | [diff] [blame] | 994 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 995 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 996 | * Access functions for manipulating queue properties |
| 997 | */ |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 998 | extern struct request_queue *blk_init_queue_node(request_fn_proc *rfn, |
Christoph Lameter | 1946089 | 2005-06-23 00:08:19 -0700 | [diff] [blame] | 999 | spinlock_t *lock, int node_id); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 1000 | extern struct request_queue *blk_init_queue(request_fn_proc *, spinlock_t *); |
Mike Snitzer | 01effb0 | 2010-05-11 08:57:42 +0200 | [diff] [blame] | 1001 | extern struct request_queue *blk_init_allocated_queue(struct request_queue *, |
| 1002 | request_fn_proc *, spinlock_t *); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 1003 | extern void blk_cleanup_queue(struct request_queue *); |
| 1004 | extern void blk_queue_make_request(struct request_queue *, make_request_fn *); |
| 1005 | extern void blk_queue_bounce_limit(struct request_queue *, u64); |
Martin K. Petersen | 086fa5f | 2010-02-26 00:20:38 -0500 | [diff] [blame] | 1006 | extern void blk_queue_max_hw_sectors(struct request_queue *, unsigned int); |
Jens Axboe | 762380a | 2014-06-05 13:38:39 -0600 | [diff] [blame] | 1007 | extern void blk_queue_chunk_sectors(struct request_queue *, unsigned int); |
Martin K. Petersen | 8a78362 | 2010-02-26 00:20:39 -0500 | [diff] [blame] | 1008 | extern void blk_queue_max_segments(struct request_queue *, unsigned short); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 1009 | extern void blk_queue_max_segment_size(struct request_queue *, unsigned int); |
Christoph Hellwig | 67efc92 | 2009-09-30 13:54:20 +0200 | [diff] [blame] | 1010 | extern void blk_queue_max_discard_sectors(struct request_queue *q, |
| 1011 | unsigned int max_discard_sectors); |
Martin K. Petersen | 4363ac7 | 2012-09-18 12:19:27 -0400 | [diff] [blame] | 1012 | extern void blk_queue_max_write_same_sectors(struct request_queue *q, |
| 1013 | unsigned int max_write_same_sectors); |
Mikulas Patocka | 5dbde46 | 2020-01-15 08:35:25 -0500 | [diff] [blame] | 1014 | extern void blk_queue_logical_block_size(struct request_queue *, unsigned int); |
Martin K. Petersen | 892b6f9 | 2010-10-13 21:18:03 +0200 | [diff] [blame] | 1015 | extern void blk_queue_physical_block_size(struct request_queue *, unsigned int); |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 1016 | extern void blk_queue_alignment_offset(struct request_queue *q, |
| 1017 | unsigned int alignment); |
Martin K. Petersen | 7c958e3 | 2009-07-31 11:49:11 -0400 | [diff] [blame] | 1018 | extern void blk_limits_io_min(struct queue_limits *limits, unsigned int min); |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 1019 | extern void blk_queue_io_min(struct request_queue *q, unsigned int min); |
Martin K. Petersen | 3c5820c | 2009-09-11 21:54:52 +0200 | [diff] [blame] | 1020 | extern void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt); |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 1021 | extern void blk_queue_io_opt(struct request_queue *q, unsigned int opt); |
Martin K. Petersen | e475bba | 2009-06-16 08:23:52 +0200 | [diff] [blame] | 1022 | extern void blk_set_default_limits(struct queue_limits *lim); |
Martin K. Petersen | b1bd055 | 2012-01-11 16:27:11 +0100 | [diff] [blame] | 1023 | extern void blk_set_stacking_limits(struct queue_limits *lim); |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 1024 | extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b, |
| 1025 | sector_t offset); |
Martin K. Petersen | 17be8c2 | 2010-01-11 03:21:49 -0500 | [diff] [blame] | 1026 | extern int bdev_stack_limits(struct queue_limits *t, struct block_device *bdev, |
| 1027 | sector_t offset); |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 1028 | extern void disk_stack_limits(struct gendisk *disk, struct block_device *bdev, |
| 1029 | sector_t offset); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 1030 | extern void blk_queue_stack_limits(struct request_queue *t, struct request_queue *b); |
Tejun Heo | e3790c7 | 2008-03-04 11:18:17 +0100 | [diff] [blame] | 1031 | extern void blk_queue_dma_pad(struct request_queue *, unsigned int); |
FUJITA Tomonori | 27f8221 | 2008-07-04 09:30:03 +0200 | [diff] [blame] | 1032 | extern void blk_queue_update_dma_pad(struct request_queue *, unsigned int); |
Tejun Heo | 2fb98e8 | 2008-02-19 11:36:53 +0100 | [diff] [blame] | 1033 | extern int blk_queue_dma_drain(struct request_queue *q, |
| 1034 | dma_drain_needed_fn *dma_drain_needed, |
| 1035 | void *buf, unsigned int size); |
Kiyoshi Ueda | ef9e3fa | 2008-10-01 16:12:15 +0200 | [diff] [blame] | 1036 | extern void blk_queue_lld_busy(struct request_queue *q, lld_busy_fn *fn); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 1037 | extern void blk_queue_segment_boundary(struct request_queue *, unsigned long); |
Keith Busch | 03100aa | 2015-08-19 14:24:05 -0700 | [diff] [blame] | 1038 | extern void blk_queue_virt_boundary(struct request_queue *, unsigned long); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 1039 | extern void blk_queue_prep_rq(struct request_queue *, prep_rq_fn *pfn); |
James Bottomley | 28018c2 | 2010-07-01 19:49:17 +0900 | [diff] [blame] | 1040 | extern void blk_queue_unprep_rq(struct request_queue *, unprep_rq_fn *ufn); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 1041 | extern void blk_queue_dma_alignment(struct request_queue *, int); |
James Bottomley | 11c3e68 | 2007-12-31 16:37:00 -0600 | [diff] [blame] | 1042 | extern void blk_queue_update_dma_alignment(struct request_queue *, int); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 1043 | extern void blk_queue_softirq_done(struct request_queue *, softirq_done_fn *); |
Jens Axboe | 242f9dc | 2008-09-14 05:55:09 -0700 | [diff] [blame] | 1044 | extern void blk_queue_rq_timed_out(struct request_queue *, rq_timed_out_fn *); |
| 1045 | extern void blk_queue_rq_timeout(struct request_queue *, unsigned int); |
shaohua.li@intel.com | f387693 | 2011-05-06 11:34:32 -0600 | [diff] [blame] | 1046 | extern void blk_queue_flush_queueable(struct request_queue *q, bool queueable); |
Jens Axboe | 93e9d8e | 2016-04-12 12:32:46 -0600 | [diff] [blame] | 1047 | extern void blk_queue_write_cache(struct request_queue *q, bool enabled, bool fua); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1048 | extern struct backing_dev_info *blk_get_backing_dev_info(struct block_device *bdev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1049 | |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 1050 | extern int blk_rq_map_sg(struct request_queue *, struct request *, struct scatterlist *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1051 | extern void blk_dump_rq_flags(struct request *, char *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1052 | extern long nr_blockdev_pages(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1053 | |
Tejun Heo | 09ac46c | 2011-12-14 00:33:38 +0100 | [diff] [blame] | 1054 | bool __must_check blk_get_queue(struct request_queue *); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 1055 | struct request_queue *blk_alloc_queue(gfp_t); |
| 1056 | struct request_queue *blk_alloc_queue_node(gfp_t, int); |
| 1057 | extern void blk_put_queue(struct request_queue *); |
Jens Axboe | 3f21c26 | 2015-06-05 10:57:37 -0600 | [diff] [blame] | 1058 | extern void blk_set_queue_dying(struct request_queue *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1059 | |
Shaohua Li | 316cc67 | 2011-07-08 08:19:21 +0200 | [diff] [blame] | 1060 | /* |
Lin Ming | 6c95466 | 2013-03-23 11:42:26 +0800 | [diff] [blame] | 1061 | * block layer runtime pm functions |
| 1062 | */ |
Rafael J. Wysocki | 47fafbc | 2014-12-04 01:00:23 +0100 | [diff] [blame] | 1063 | #ifdef CONFIG_PM |
Lin Ming | 6c95466 | 2013-03-23 11:42:26 +0800 | [diff] [blame] | 1064 | extern void blk_pm_runtime_init(struct request_queue *q, struct device *dev); |
| 1065 | extern int blk_pre_runtime_suspend(struct request_queue *q); |
| 1066 | extern void blk_post_runtime_suspend(struct request_queue *q, int err); |
| 1067 | extern void blk_pre_runtime_resume(struct request_queue *q); |
| 1068 | extern void blk_post_runtime_resume(struct request_queue *q, int err); |
Mika Westerberg | d07ab6d | 2016-02-18 10:54:11 +0200 | [diff] [blame] | 1069 | extern void blk_set_runtime_active(struct request_queue *q); |
Lin Ming | 6c95466 | 2013-03-23 11:42:26 +0800 | [diff] [blame] | 1070 | #else |
| 1071 | static inline void blk_pm_runtime_init(struct request_queue *q, |
| 1072 | struct device *dev) {} |
| 1073 | static inline int blk_pre_runtime_suspend(struct request_queue *q) |
| 1074 | { |
| 1075 | return -ENOSYS; |
| 1076 | } |
| 1077 | static inline void blk_post_runtime_suspend(struct request_queue *q, int err) {} |
| 1078 | static inline void blk_pre_runtime_resume(struct request_queue *q) {} |
| 1079 | static inline void blk_post_runtime_resume(struct request_queue *q, int err) {} |
Tobias Klauser | f99694c | 2016-11-18 15:16:06 +0100 | [diff] [blame] | 1080 | static inline void blk_set_runtime_active(struct request_queue *q) {} |
Lin Ming | 6c95466 | 2013-03-23 11:42:26 +0800 | [diff] [blame] | 1081 | #endif |
| 1082 | |
| 1083 | /* |
Suresh Jayaraman | 75df713 | 2011-09-21 10:00:16 +0200 | [diff] [blame] | 1084 | * blk_plug permits building a queue of related requests by holding the I/O |
| 1085 | * fragments for a short period. This allows merging of sequential requests |
| 1086 | * into single larger request. As the requests are moved from a per-task list to |
| 1087 | * the device's request_queue in a batch, this results in improved scalability |
| 1088 | * as the lock contention for request_queue lock is reduced. |
| 1089 | * |
| 1090 | * It is ok not to disable preemption when adding the request to the plug list |
| 1091 | * or when attempting a merge, because blk_schedule_flush_list() will only flush |
| 1092 | * the plug list when the task sleeps by itself. For details, please see |
| 1093 | * schedule() where blk_schedule_flush_plug() is called. |
Shaohua Li | 316cc67 | 2011-07-08 08:19:21 +0200 | [diff] [blame] | 1094 | */ |
Jens Axboe | 73c1010 | 2011-03-08 13:19:51 +0100 | [diff] [blame] | 1095 | struct blk_plug { |
Suresh Jayaraman | 75df713 | 2011-09-21 10:00:16 +0200 | [diff] [blame] | 1096 | struct list_head list; /* requests */ |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1097 | struct list_head mq_list; /* blk-mq requests */ |
Suresh Jayaraman | 75df713 | 2011-09-21 10:00:16 +0200 | [diff] [blame] | 1098 | struct list_head cb_list; /* md requires an unplug callback */ |
Jens Axboe | 73c1010 | 2011-03-08 13:19:51 +0100 | [diff] [blame] | 1099 | }; |
Shaohua Li | 55c022b | 2011-07-08 08:19:20 +0200 | [diff] [blame] | 1100 | #define BLK_MAX_REQUEST_COUNT 16 |
| 1101 | |
NeilBrown | 9cbb175 | 2012-07-31 09:08:14 +0200 | [diff] [blame] | 1102 | struct blk_plug_cb; |
NeilBrown | 74018dc | 2012-07-31 09:08:15 +0200 | [diff] [blame] | 1103 | typedef void (*blk_plug_cb_fn)(struct blk_plug_cb *, bool); |
NeilBrown | 048c937 | 2011-04-18 09:52:22 +0200 | [diff] [blame] | 1104 | struct blk_plug_cb { |
| 1105 | struct list_head list; |
NeilBrown | 9cbb175 | 2012-07-31 09:08:14 +0200 | [diff] [blame] | 1106 | blk_plug_cb_fn callback; |
| 1107 | void *data; |
NeilBrown | 048c937 | 2011-04-18 09:52:22 +0200 | [diff] [blame] | 1108 | }; |
NeilBrown | 9cbb175 | 2012-07-31 09:08:14 +0200 | [diff] [blame] | 1109 | extern struct blk_plug_cb *blk_check_plugged(blk_plug_cb_fn unplug, |
| 1110 | void *data, int size); |
Jens Axboe | 73c1010 | 2011-03-08 13:19:51 +0100 | [diff] [blame] | 1111 | extern void blk_start_plug(struct blk_plug *); |
| 1112 | extern void blk_finish_plug(struct blk_plug *); |
Jens Axboe | f660378 | 2011-04-15 15:49:07 +0200 | [diff] [blame] | 1113 | extern void blk_flush_plug_list(struct blk_plug *, bool); |
Jens Axboe | 73c1010 | 2011-03-08 13:19:51 +0100 | [diff] [blame] | 1114 | |
| 1115 | static inline void blk_flush_plug(struct task_struct *tsk) |
| 1116 | { |
| 1117 | struct blk_plug *plug = tsk->plug; |
| 1118 | |
Christoph Hellwig | 88b996c | 2011-04-15 15:20:10 +0200 | [diff] [blame] | 1119 | if (plug) |
Jens Axboe | a237c1c | 2011-04-16 13:27:55 +0200 | [diff] [blame] | 1120 | blk_flush_plug_list(plug, false); |
| 1121 | } |
| 1122 | |
| 1123 | static inline void blk_schedule_flush_plug(struct task_struct *tsk) |
| 1124 | { |
| 1125 | struct blk_plug *plug = tsk->plug; |
| 1126 | |
| 1127 | if (plug) |
Jens Axboe | f660378 | 2011-04-15 15:49:07 +0200 | [diff] [blame] | 1128 | blk_flush_plug_list(plug, true); |
Jens Axboe | 73c1010 | 2011-03-08 13:19:51 +0100 | [diff] [blame] | 1129 | } |
| 1130 | |
| 1131 | static inline bool blk_needs_flush_plug(struct task_struct *tsk) |
| 1132 | { |
| 1133 | struct blk_plug *plug = tsk->plug; |
| 1134 | |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1135 | return plug && |
| 1136 | (!list_empty(&plug->list) || |
| 1137 | !list_empty(&plug->mq_list) || |
| 1138 | !list_empty(&plug->cb_list)); |
Jens Axboe | 73c1010 | 2011-03-08 13:19:51 +0100 | [diff] [blame] | 1139 | } |
| 1140 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1141 | /* |
| 1142 | * tag stuff |
| 1143 | */ |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 1144 | extern int blk_queue_start_tag(struct request_queue *, struct request *); |
| 1145 | extern struct request *blk_queue_find_tag(struct request_queue *, int); |
| 1146 | extern void blk_queue_end_tag(struct request_queue *, struct request *); |
Shaohua Li | ee1b6f7 | 2015-01-15 17:32:25 -0800 | [diff] [blame] | 1147 | extern int blk_queue_init_tags(struct request_queue *, int, struct blk_queue_tag *, int); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 1148 | extern void blk_queue_free_tags(struct request_queue *); |
| 1149 | extern int blk_queue_resize_tags(struct request_queue *, int); |
| 1150 | extern void blk_queue_invalidate_tags(struct request_queue *); |
Shaohua Li | ee1b6f7 | 2015-01-15 17:32:25 -0800 | [diff] [blame] | 1151 | extern struct blk_queue_tag *blk_init_tags(int, int); |
James Bottomley | 492dfb4 | 2006-08-30 15:48:45 -0400 | [diff] [blame] | 1152 | extern void blk_free_tags(struct blk_queue_tag *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1153 | |
David C Somayajulu | f583f49 | 2006-10-04 08:27:25 +0200 | [diff] [blame] | 1154 | static inline struct request *blk_map_queue_find_tag(struct blk_queue_tag *bqt, |
| 1155 | int tag) |
| 1156 | { |
| 1157 | if (unlikely(bqt == NULL || tag >= bqt->real_max_depth)) |
| 1158 | return NULL; |
| 1159 | return bqt->tag_index[tag]; |
| 1160 | } |
Christoph Hellwig | dd3932e | 2010-09-16 20:51:46 +0200 | [diff] [blame] | 1161 | |
Christoph Hellwig | e950fdf | 2016-07-19 11:23:33 +0200 | [diff] [blame] | 1162 | |
| 1163 | #define BLKDEV_DISCARD_SECURE (1 << 0) /* issue a secure erase */ |
| 1164 | #define BLKDEV_DISCARD_ZERO (1 << 1) /* must reliably zero data */ |
Christoph Hellwig | dd3932e | 2010-09-16 20:51:46 +0200 | [diff] [blame] | 1165 | |
| 1166 | extern int blkdev_issue_flush(struct block_device *, gfp_t, sector_t *); |
Dmitry Monakhov | fbd9b09 | 2010-04-28 17:55:06 +0400 | [diff] [blame] | 1167 | extern int blkdev_issue_discard(struct block_device *bdev, sector_t sector, |
| 1168 | sector_t nr_sects, gfp_t gfp_mask, unsigned long flags); |
Christoph Hellwig | 38f2525 | 2016-04-16 14:55:28 -0400 | [diff] [blame] | 1169 | extern int __blkdev_issue_discard(struct block_device *bdev, sector_t sector, |
Christoph Hellwig | 288dab8 | 2016-06-09 16:00:36 +0200 | [diff] [blame] | 1170 | sector_t nr_sects, gfp_t gfp_mask, int flags, |
Mike Christie | 469e321 | 2016-06-05 14:31:49 -0500 | [diff] [blame] | 1171 | struct bio **biop); |
Martin K. Petersen | 4363ac7 | 2012-09-18 12:19:27 -0400 | [diff] [blame] | 1172 | extern int blkdev_issue_write_same(struct block_device *bdev, sector_t sector, |
| 1173 | sector_t nr_sects, gfp_t gfp_mask, struct page *page); |
Dmitry Monakhov | 3f14d79 | 2010-04-28 17:55:09 +0400 | [diff] [blame] | 1174 | extern int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, |
Martin K. Petersen | d93ba7a | 2015-01-20 20:06:30 -0500 | [diff] [blame] | 1175 | sector_t nr_sects, gfp_t gfp_mask, bool discard); |
Christoph Hellwig | 2cf6d26 | 2010-08-18 05:29:10 -0400 | [diff] [blame] | 1176 | static inline int sb_issue_discard(struct super_block *sb, sector_t block, |
| 1177 | sector_t nr_blocks, gfp_t gfp_mask, unsigned long flags) |
David Woodhouse | fb2dce8 | 2008-08-05 18:01:53 +0100 | [diff] [blame] | 1178 | { |
Bart Van Assche | d24c407 | 2018-03-14 15:48:06 -0700 | [diff] [blame] | 1179 | return blkdev_issue_discard(sb->s_bdev, |
| 1180 | block << (sb->s_blocksize_bits - |
| 1181 | SECTOR_SHIFT), |
| 1182 | nr_blocks << (sb->s_blocksize_bits - |
| 1183 | SECTOR_SHIFT), |
Christoph Hellwig | 2cf6d26 | 2010-08-18 05:29:10 -0400 | [diff] [blame] | 1184 | gfp_mask, flags); |
David Woodhouse | fb2dce8 | 2008-08-05 18:01:53 +0100 | [diff] [blame] | 1185 | } |
Lukas Czerner | e6fa0be | 2010-10-27 21:30:04 -0400 | [diff] [blame] | 1186 | static inline int sb_issue_zeroout(struct super_block *sb, sector_t block, |
Theodore Ts'o | a107e5a | 2010-10-27 23:44:47 -0400 | [diff] [blame] | 1187 | sector_t nr_blocks, gfp_t gfp_mask) |
Lukas Czerner | e6fa0be | 2010-10-27 21:30:04 -0400 | [diff] [blame] | 1188 | { |
| 1189 | return blkdev_issue_zeroout(sb->s_bdev, |
Bart Van Assche | d24c407 | 2018-03-14 15:48:06 -0700 | [diff] [blame] | 1190 | block << (sb->s_blocksize_bits - |
| 1191 | SECTOR_SHIFT), |
| 1192 | nr_blocks << (sb->s_blocksize_bits - |
| 1193 | SECTOR_SHIFT), |
Martin K. Petersen | d93ba7a | 2015-01-20 20:06:30 -0500 | [diff] [blame] | 1194 | gfp_mask, true); |
Lukas Czerner | e6fa0be | 2010-10-27 21:30:04 -0400 | [diff] [blame] | 1195 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1196 | |
Jens Axboe | 018e044 | 2009-06-26 16:27:10 +0200 | [diff] [blame] | 1197 | extern int blk_verify_command(unsigned char *cmd, fmode_t has_write_perm); |
Adel Gadllah | 0b07de8 | 2008-06-26 13:48:27 +0200 | [diff] [blame] | 1198 | |
Martin K. Petersen | eb28d31 | 2010-02-26 00:20:37 -0500 | [diff] [blame] | 1199 | enum blk_default_limits { |
| 1200 | BLK_MAX_SEGMENTS = 128, |
| 1201 | BLK_SAFE_MAX_SECTORS = 255, |
Jeff Moyer | d2be537 | 2015-08-13 14:57:57 -0400 | [diff] [blame] | 1202 | BLK_DEF_MAX_SECTORS = 2560, |
Martin K. Petersen | eb28d31 | 2010-02-26 00:20:37 -0500 | [diff] [blame] | 1203 | BLK_MAX_SEGMENT_SIZE = 65536, |
| 1204 | BLK_SEG_BOUNDARY_MASK = 0xFFFFFFFFUL, |
| 1205 | }; |
Milan Broz | 0e435ac | 2008-12-03 12:55:08 +0100 | [diff] [blame] | 1206 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1207 | #define blkdev_entry_to_request(entry) list_entry((entry), struct request, queuelist) |
| 1208 | |
Martin K. Petersen | ae03bf6 | 2009-05-22 17:17:50 -0400 | [diff] [blame] | 1209 | static inline unsigned long queue_bounce_pfn(struct request_queue *q) |
| 1210 | { |
Martin K. Petersen | 025146e | 2009-05-22 17:17:51 -0400 | [diff] [blame] | 1211 | return q->limits.bounce_pfn; |
Martin K. Petersen | ae03bf6 | 2009-05-22 17:17:50 -0400 | [diff] [blame] | 1212 | } |
| 1213 | |
| 1214 | static inline unsigned long queue_segment_boundary(struct request_queue *q) |
| 1215 | { |
Martin K. Petersen | 025146e | 2009-05-22 17:17:51 -0400 | [diff] [blame] | 1216 | return q->limits.seg_boundary_mask; |
Martin K. Petersen | ae03bf6 | 2009-05-22 17:17:50 -0400 | [diff] [blame] | 1217 | } |
| 1218 | |
Keith Busch | 03100aa | 2015-08-19 14:24:05 -0700 | [diff] [blame] | 1219 | static inline unsigned long queue_virt_boundary(struct request_queue *q) |
| 1220 | { |
| 1221 | return q->limits.virt_boundary_mask; |
| 1222 | } |
| 1223 | |
Martin K. Petersen | ae03bf6 | 2009-05-22 17:17:50 -0400 | [diff] [blame] | 1224 | static inline unsigned int queue_max_sectors(struct request_queue *q) |
| 1225 | { |
Martin K. Petersen | 025146e | 2009-05-22 17:17:51 -0400 | [diff] [blame] | 1226 | return q->limits.max_sectors; |
Martin K. Petersen | ae03bf6 | 2009-05-22 17:17:50 -0400 | [diff] [blame] | 1227 | } |
| 1228 | |
| 1229 | static inline unsigned int queue_max_hw_sectors(struct request_queue *q) |
| 1230 | { |
Martin K. Petersen | 025146e | 2009-05-22 17:17:51 -0400 | [diff] [blame] | 1231 | return q->limits.max_hw_sectors; |
Martin K. Petersen | ae03bf6 | 2009-05-22 17:17:50 -0400 | [diff] [blame] | 1232 | } |
| 1233 | |
Martin K. Petersen | 8a78362 | 2010-02-26 00:20:39 -0500 | [diff] [blame] | 1234 | static inline unsigned short queue_max_segments(struct request_queue *q) |
Martin K. Petersen | ae03bf6 | 2009-05-22 17:17:50 -0400 | [diff] [blame] | 1235 | { |
Martin K. Petersen | 8a78362 | 2010-02-26 00:20:39 -0500 | [diff] [blame] | 1236 | return q->limits.max_segments; |
Martin K. Petersen | ae03bf6 | 2009-05-22 17:17:50 -0400 | [diff] [blame] | 1237 | } |
| 1238 | |
| 1239 | static inline unsigned int queue_max_segment_size(struct request_queue *q) |
| 1240 | { |
Martin K. Petersen | 025146e | 2009-05-22 17:17:51 -0400 | [diff] [blame] | 1241 | return q->limits.max_segment_size; |
Martin K. Petersen | ae03bf6 | 2009-05-22 17:17:50 -0400 | [diff] [blame] | 1242 | } |
| 1243 | |
Mikulas Patocka | 5dbde46 | 2020-01-15 08:35:25 -0500 | [diff] [blame] | 1244 | static inline unsigned queue_logical_block_size(struct request_queue *q) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1245 | { |
| 1246 | int retval = 512; |
| 1247 | |
Martin K. Petersen | 025146e | 2009-05-22 17:17:51 -0400 | [diff] [blame] | 1248 | if (q && q->limits.logical_block_size) |
| 1249 | retval = q->limits.logical_block_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1250 | |
| 1251 | return retval; |
| 1252 | } |
| 1253 | |
Mikulas Patocka | 5dbde46 | 2020-01-15 08:35:25 -0500 | [diff] [blame] | 1254 | static inline unsigned int bdev_logical_block_size(struct block_device *bdev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1255 | { |
Martin K. Petersen | e1defc4 | 2009-05-22 17:17:49 -0400 | [diff] [blame] | 1256 | return queue_logical_block_size(bdev_get_queue(bdev)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1257 | } |
| 1258 | |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 1259 | static inline unsigned int queue_physical_block_size(struct request_queue *q) |
| 1260 | { |
| 1261 | return q->limits.physical_block_size; |
| 1262 | } |
| 1263 | |
Martin K. Petersen | 892b6f9 | 2010-10-13 21:18:03 +0200 | [diff] [blame] | 1264 | static inline unsigned int bdev_physical_block_size(struct block_device *bdev) |
Martin K. Petersen | ac481c2 | 2009-10-03 20:52:01 +0200 | [diff] [blame] | 1265 | { |
| 1266 | return queue_physical_block_size(bdev_get_queue(bdev)); |
| 1267 | } |
| 1268 | |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 1269 | static inline unsigned int queue_io_min(struct request_queue *q) |
| 1270 | { |
| 1271 | return q->limits.io_min; |
| 1272 | } |
| 1273 | |
Martin K. Petersen | ac481c2 | 2009-10-03 20:52:01 +0200 | [diff] [blame] | 1274 | static inline int bdev_io_min(struct block_device *bdev) |
| 1275 | { |
| 1276 | return queue_io_min(bdev_get_queue(bdev)); |
| 1277 | } |
| 1278 | |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 1279 | static inline unsigned int queue_io_opt(struct request_queue *q) |
| 1280 | { |
| 1281 | return q->limits.io_opt; |
| 1282 | } |
| 1283 | |
Martin K. Petersen | ac481c2 | 2009-10-03 20:52:01 +0200 | [diff] [blame] | 1284 | static inline int bdev_io_opt(struct block_device *bdev) |
| 1285 | { |
| 1286 | return queue_io_opt(bdev_get_queue(bdev)); |
| 1287 | } |
| 1288 | |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 1289 | static inline int queue_alignment_offset(struct request_queue *q) |
| 1290 | { |
Martin K. Petersen | ac481c2 | 2009-10-03 20:52:01 +0200 | [diff] [blame] | 1291 | if (q->limits.misaligned) |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 1292 | return -1; |
| 1293 | |
Martin K. Petersen | ac481c2 | 2009-10-03 20:52:01 +0200 | [diff] [blame] | 1294 | return q->limits.alignment_offset; |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 1295 | } |
| 1296 | |
Martin K. Petersen | e03a72e | 2010-01-11 03:21:51 -0500 | [diff] [blame] | 1297 | static inline int queue_limit_alignment_offset(struct queue_limits *lim, sector_t sector) |
Martin K. Petersen | 81744ee | 2009-12-29 08:35:35 +0100 | [diff] [blame] | 1298 | { |
| 1299 | unsigned int granularity = max(lim->physical_block_size, lim->io_min); |
Bart Van Assche | d24c407 | 2018-03-14 15:48:06 -0700 | [diff] [blame] | 1300 | unsigned int alignment = sector_div(sector, granularity >> SECTOR_SHIFT) |
| 1301 | << SECTOR_SHIFT; |
Martin K. Petersen | 81744ee | 2009-12-29 08:35:35 +0100 | [diff] [blame] | 1302 | |
Mike Snitzer | b8839b8 | 2014-10-08 18:26:13 -0400 | [diff] [blame] | 1303 | return (granularity + lim->alignment_offset - alignment) % granularity; |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 1304 | } |
| 1305 | |
Martin K. Petersen | ac481c2 | 2009-10-03 20:52:01 +0200 | [diff] [blame] | 1306 | static inline int bdev_alignment_offset(struct block_device *bdev) |
| 1307 | { |
| 1308 | struct request_queue *q = bdev_get_queue(bdev); |
| 1309 | |
| 1310 | if (q->limits.misaligned) |
| 1311 | return -1; |
| 1312 | |
| 1313 | if (bdev != bdev->bd_contains) |
| 1314 | return bdev->bd_part->alignment_offset; |
| 1315 | |
| 1316 | return q->limits.alignment_offset; |
| 1317 | } |
| 1318 | |
Martin K. Petersen | 86b3728 | 2009-11-10 11:50:21 +0100 | [diff] [blame] | 1319 | static inline int queue_discard_alignment(struct request_queue *q) |
| 1320 | { |
| 1321 | if (q->limits.discard_misaligned) |
| 1322 | return -1; |
| 1323 | |
| 1324 | return q->limits.discard_alignment; |
| 1325 | } |
| 1326 | |
Martin K. Petersen | e03a72e | 2010-01-11 03:21:51 -0500 | [diff] [blame] | 1327 | static inline int queue_limit_discard_alignment(struct queue_limits *lim, sector_t sector) |
Martin K. Petersen | 86b3728 | 2009-11-10 11:50:21 +0100 | [diff] [blame] | 1328 | { |
Linus Torvalds | 5977107 | 2012-12-19 07:18:35 -0800 | [diff] [blame] | 1329 | unsigned int alignment, granularity, offset; |
Martin K. Petersen | dd3d145 | 2010-01-11 03:21:48 -0500 | [diff] [blame] | 1330 | |
Martin K. Petersen | a934a00 | 2011-05-18 10:37:35 +0200 | [diff] [blame] | 1331 | if (!lim->max_discard_sectors) |
| 1332 | return 0; |
| 1333 | |
Linus Torvalds | 5977107 | 2012-12-19 07:18:35 -0800 | [diff] [blame] | 1334 | /* Why are these in bytes, not sectors? */ |
Bart Van Assche | d24c407 | 2018-03-14 15:48:06 -0700 | [diff] [blame] | 1335 | alignment = lim->discard_alignment >> SECTOR_SHIFT; |
| 1336 | granularity = lim->discard_granularity >> SECTOR_SHIFT; |
Linus Torvalds | 5977107 | 2012-12-19 07:18:35 -0800 | [diff] [blame] | 1337 | if (!granularity) |
| 1338 | return 0; |
| 1339 | |
| 1340 | /* Offset of the partition start in 'granularity' sectors */ |
| 1341 | offset = sector_div(sector, granularity); |
| 1342 | |
| 1343 | /* And why do we do this modulus *again* in blkdev_issue_discard()? */ |
| 1344 | offset = (granularity + alignment - offset) % granularity; |
| 1345 | |
| 1346 | /* Turn it back into bytes, gaah */ |
Bart Van Assche | d24c407 | 2018-03-14 15:48:06 -0700 | [diff] [blame] | 1347 | return offset << SECTOR_SHIFT; |
Martin K. Petersen | 86b3728 | 2009-11-10 11:50:21 +0100 | [diff] [blame] | 1348 | } |
| 1349 | |
Paolo Bonzini | c6e6663 | 2012-08-02 09:48:50 +0200 | [diff] [blame] | 1350 | static inline int bdev_discard_alignment(struct block_device *bdev) |
| 1351 | { |
| 1352 | struct request_queue *q = bdev_get_queue(bdev); |
| 1353 | |
| 1354 | if (bdev != bdev->bd_contains) |
| 1355 | return bdev->bd_part->discard_alignment; |
| 1356 | |
| 1357 | return q->limits.discard_alignment; |
| 1358 | } |
| 1359 | |
Martin K. Petersen | 98262f2 | 2009-12-03 09:24:48 +0100 | [diff] [blame] | 1360 | static inline unsigned int queue_discard_zeroes_data(struct request_queue *q) |
| 1361 | { |
Martin K. Petersen | a934a00 | 2011-05-18 10:37:35 +0200 | [diff] [blame] | 1362 | if (q->limits.max_discard_sectors && q->limits.discard_zeroes_data == 1) |
Martin K. Petersen | 98262f2 | 2009-12-03 09:24:48 +0100 | [diff] [blame] | 1363 | return 1; |
| 1364 | |
| 1365 | return 0; |
| 1366 | } |
| 1367 | |
| 1368 | static inline unsigned int bdev_discard_zeroes_data(struct block_device *bdev) |
| 1369 | { |
| 1370 | return queue_discard_zeroes_data(bdev_get_queue(bdev)); |
| 1371 | } |
| 1372 | |
Martin K. Petersen | 4363ac7 | 2012-09-18 12:19:27 -0400 | [diff] [blame] | 1373 | static inline unsigned int bdev_write_same(struct block_device *bdev) |
| 1374 | { |
| 1375 | struct request_queue *q = bdev_get_queue(bdev); |
| 1376 | |
| 1377 | if (q) |
| 1378 | return q->limits.max_write_same_sectors; |
| 1379 | |
| 1380 | return 0; |
| 1381 | } |
| 1382 | |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 1383 | static inline int queue_dma_alignment(struct request_queue *q) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1384 | { |
Pete Wyckoff | 482eb68 | 2008-01-01 10:23:02 -0500 | [diff] [blame] | 1385 | return q ? q->dma_alignment : 511; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1386 | } |
| 1387 | |
Namhyung Kim | 1441779 | 2010-09-15 13:08:27 +0200 | [diff] [blame] | 1388 | static inline int blk_rq_aligned(struct request_queue *q, unsigned long addr, |
FUJITA Tomonori | 8790407 | 2008-08-28 15:05:58 +0900 | [diff] [blame] | 1389 | unsigned int len) |
| 1390 | { |
| 1391 | unsigned int alignment = queue_dma_alignment(q) | q->dma_pad_mask; |
Namhyung Kim | 1441779 | 2010-09-15 13:08:27 +0200 | [diff] [blame] | 1392 | return !(addr & alignment) && !(len & alignment); |
FUJITA Tomonori | 8790407 | 2008-08-28 15:05:58 +0900 | [diff] [blame] | 1393 | } |
| 1394 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1395 | /* assumes size > 256 */ |
| 1396 | static inline unsigned int blksize_bits(unsigned int size) |
| 1397 | { |
| 1398 | unsigned int bits = 8; |
| 1399 | do { |
| 1400 | bits++; |
| 1401 | size >>= 1; |
| 1402 | } while (size > 256); |
| 1403 | return bits; |
| 1404 | } |
| 1405 | |
Adrian Bunk | 2befb9e | 2005-09-10 00:27:17 -0700 | [diff] [blame] | 1406 | static inline unsigned int block_size(struct block_device *bdev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1407 | { |
| 1408 | return bdev->bd_block_size; |
| 1409 | } |
| 1410 | |
shaohua.li@intel.com | f387693 | 2011-05-06 11:34:32 -0600 | [diff] [blame] | 1411 | static inline bool queue_flush_queueable(struct request_queue *q) |
| 1412 | { |
Jens Axboe | c888a8f | 2016-04-13 13:33:19 -0600 | [diff] [blame] | 1413 | return !test_bit(QUEUE_FLAG_FLUSH_NQ, &q->queue_flags); |
shaohua.li@intel.com | f387693 | 2011-05-06 11:34:32 -0600 | [diff] [blame] | 1414 | } |
| 1415 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1416 | typedef struct {struct page *v;} Sector; |
| 1417 | |
| 1418 | unsigned char *read_dev_sector(struct block_device *, sector_t, Sector *); |
| 1419 | |
| 1420 | static inline void put_dev_sector(Sector p) |
| 1421 | { |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 1422 | put_page(p.v); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1423 | } |
| 1424 | |
Ming Lei | e0af291 | 2016-02-26 23:40:51 +0800 | [diff] [blame] | 1425 | static inline bool __bvec_gap_to_prev(struct request_queue *q, |
| 1426 | struct bio_vec *bprv, unsigned int offset) |
| 1427 | { |
| 1428 | return offset || |
| 1429 | ((bprv->bv_offset + bprv->bv_len) & queue_virt_boundary(q)); |
| 1430 | } |
| 1431 | |
Keith Busch | 03100aa | 2015-08-19 14:24:05 -0700 | [diff] [blame] | 1432 | /* |
| 1433 | * Check if adding a bio_vec after bprv with offset would create a gap in |
| 1434 | * the SG list. Most drivers don't care about this, but some do. |
| 1435 | */ |
| 1436 | static inline bool bvec_gap_to_prev(struct request_queue *q, |
| 1437 | struct bio_vec *bprv, unsigned int offset) |
| 1438 | { |
| 1439 | if (!queue_virt_boundary(q)) |
| 1440 | return false; |
Ming Lei | e0af291 | 2016-02-26 23:40:51 +0800 | [diff] [blame] | 1441 | return __bvec_gap_to_prev(q, bprv, offset); |
Keith Busch | 03100aa | 2015-08-19 14:24:05 -0700 | [diff] [blame] | 1442 | } |
| 1443 | |
Jens Axboe | 5e7c427 | 2015-09-03 19:28:20 +0300 | [diff] [blame] | 1444 | static inline bool bio_will_gap(struct request_queue *q, struct bio *prev, |
| 1445 | struct bio *next) |
| 1446 | { |
Ming Lei | 25e71a9 | 2016-02-26 23:40:52 +0800 | [diff] [blame] | 1447 | if (bio_has_data(prev) && queue_virt_boundary(q)) { |
| 1448 | struct bio_vec pb, nb; |
Jens Axboe | 5e7c427 | 2015-09-03 19:28:20 +0300 | [diff] [blame] | 1449 | |
Ming Lei | 25e71a9 | 2016-02-26 23:40:52 +0800 | [diff] [blame] | 1450 | bio_get_last_bvec(prev, &pb); |
| 1451 | bio_get_first_bvec(next, &nb); |
| 1452 | |
| 1453 | return __bvec_gap_to_prev(q, &pb, nb.bv_offset); |
| 1454 | } |
| 1455 | |
| 1456 | return false; |
Jens Axboe | 5e7c427 | 2015-09-03 19:28:20 +0300 | [diff] [blame] | 1457 | } |
| 1458 | |
| 1459 | static inline bool req_gap_back_merge(struct request *req, struct bio *bio) |
| 1460 | { |
| 1461 | return bio_will_gap(req->q, req->biotail, bio); |
| 1462 | } |
| 1463 | |
| 1464 | static inline bool req_gap_front_merge(struct request *req, struct bio *bio) |
| 1465 | { |
| 1466 | return bio_will_gap(req->q, bio, req->bio); |
| 1467 | } |
| 1468 | |
Jens Axboe | 59c3d45 | 2014-04-08 09:15:35 -0600 | [diff] [blame] | 1469 | int kblockd_schedule_work(struct work_struct *work); |
Jens Axboe | ee63cfa | 2016-08-24 15:52:48 -0600 | [diff] [blame] | 1470 | int kblockd_schedule_work_on(int cpu, struct work_struct *work); |
Jens Axboe | 59c3d45 | 2014-04-08 09:15:35 -0600 | [diff] [blame] | 1471 | int kblockd_schedule_delayed_work(struct delayed_work *dwork, unsigned long delay); |
Jens Axboe | 8ab1459 | 2014-04-08 09:17:40 -0600 | [diff] [blame] | 1472 | int kblockd_schedule_delayed_work_on(int cpu, struct delayed_work *dwork, unsigned long delay); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1473 | |
Divyesh Shah | 9195291 | 2010-04-01 15:01:41 -0700 | [diff] [blame] | 1474 | #ifdef CONFIG_BLK_CGROUP |
Jens Axboe | 28f4197 | 2010-06-01 12:23:18 +0200 | [diff] [blame] | 1475 | /* |
| 1476 | * This should not be using sched_clock(). A real patch is in progress |
| 1477 | * to fix this up, until that is in place we need to disable preemption |
| 1478 | * around sched_clock() in this function and set_io_start_time_ns(). |
| 1479 | */ |
Divyesh Shah | 9195291 | 2010-04-01 15:01:41 -0700 | [diff] [blame] | 1480 | static inline void set_start_time_ns(struct request *req) |
| 1481 | { |
Jens Axboe | 28f4197 | 2010-06-01 12:23:18 +0200 | [diff] [blame] | 1482 | preempt_disable(); |
Divyesh Shah | 9195291 | 2010-04-01 15:01:41 -0700 | [diff] [blame] | 1483 | req->start_time_ns = sched_clock(); |
Jens Axboe | 28f4197 | 2010-06-01 12:23:18 +0200 | [diff] [blame] | 1484 | preempt_enable(); |
Divyesh Shah | 9195291 | 2010-04-01 15:01:41 -0700 | [diff] [blame] | 1485 | } |
| 1486 | |
| 1487 | static inline void set_io_start_time_ns(struct request *req) |
| 1488 | { |
Jens Axboe | 28f4197 | 2010-06-01 12:23:18 +0200 | [diff] [blame] | 1489 | preempt_disable(); |
Divyesh Shah | 9195291 | 2010-04-01 15:01:41 -0700 | [diff] [blame] | 1490 | req->io_start_time_ns = sched_clock(); |
Jens Axboe | 28f4197 | 2010-06-01 12:23:18 +0200 | [diff] [blame] | 1491 | preempt_enable(); |
Divyesh Shah | 9195291 | 2010-04-01 15:01:41 -0700 | [diff] [blame] | 1492 | } |
Divyesh Shah | 84c124d | 2010-04-09 08:31:19 +0200 | [diff] [blame] | 1493 | |
| 1494 | static inline uint64_t rq_start_time_ns(struct request *req) |
| 1495 | { |
| 1496 | return req->start_time_ns; |
| 1497 | } |
| 1498 | |
| 1499 | static inline uint64_t rq_io_start_time_ns(struct request *req) |
| 1500 | { |
| 1501 | return req->io_start_time_ns; |
| 1502 | } |
Divyesh Shah | 9195291 | 2010-04-01 15:01:41 -0700 | [diff] [blame] | 1503 | #else |
| 1504 | static inline void set_start_time_ns(struct request *req) {} |
| 1505 | static inline void set_io_start_time_ns(struct request *req) {} |
Divyesh Shah | 84c124d | 2010-04-09 08:31:19 +0200 | [diff] [blame] | 1506 | static inline uint64_t rq_start_time_ns(struct request *req) |
| 1507 | { |
| 1508 | return 0; |
| 1509 | } |
| 1510 | static inline uint64_t rq_io_start_time_ns(struct request *req) |
| 1511 | { |
| 1512 | return 0; |
| 1513 | } |
Divyesh Shah | 9195291 | 2010-04-01 15:01:41 -0700 | [diff] [blame] | 1514 | #endif |
| 1515 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1516 | #define MODULE_ALIAS_BLOCKDEV(major,minor) \ |
| 1517 | MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor)) |
| 1518 | #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \ |
| 1519 | MODULE_ALIAS("block-major-" __stringify(major) "-*") |
| 1520 | |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 1521 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
| 1522 | |
Martin K. Petersen | 8288f49 | 2014-09-26 19:20:02 -0400 | [diff] [blame] | 1523 | enum blk_integrity_flags { |
| 1524 | BLK_INTEGRITY_VERIFY = 1 << 0, |
| 1525 | BLK_INTEGRITY_GENERATE = 1 << 1, |
Martin K. Petersen | 3aec2f4 | 2014-09-26 19:20:03 -0400 | [diff] [blame] | 1526 | BLK_INTEGRITY_DEVICE_CAPABLE = 1 << 2, |
Martin K. Petersen | aae7df5 | 2014-09-26 19:20:05 -0400 | [diff] [blame] | 1527 | BLK_INTEGRITY_IP_CHECKSUM = 1 << 3, |
Martin K. Petersen | 8288f49 | 2014-09-26 19:20:02 -0400 | [diff] [blame] | 1528 | }; |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 1529 | |
Martin K. Petersen | 1859308 | 2014-09-26 19:20:01 -0400 | [diff] [blame] | 1530 | struct blk_integrity_iter { |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 1531 | void *prot_buf; |
| 1532 | void *data_buf; |
Martin K. Petersen | 3be91c4 | 2014-09-26 19:19:59 -0400 | [diff] [blame] | 1533 | sector_t seed; |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 1534 | unsigned int data_size; |
Martin K. Petersen | 3be91c4 | 2014-09-26 19:19:59 -0400 | [diff] [blame] | 1535 | unsigned short interval; |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 1536 | const char *disk_name; |
| 1537 | }; |
| 1538 | |
Martin K. Petersen | 1859308 | 2014-09-26 19:20:01 -0400 | [diff] [blame] | 1539 | typedef int (integrity_processing_fn) (struct blk_integrity_iter *); |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 1540 | |
Martin K. Petersen | 0f8087e | 2015-10-21 13:19:33 -0400 | [diff] [blame] | 1541 | struct blk_integrity_profile { |
| 1542 | integrity_processing_fn *generate_fn; |
| 1543 | integrity_processing_fn *verify_fn; |
| 1544 | const char *name; |
| 1545 | }; |
| 1546 | |
Martin K. Petersen | 25520d5 | 2015-10-21 13:19:49 -0400 | [diff] [blame] | 1547 | extern void blk_integrity_register(struct gendisk *, struct blk_integrity *); |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 1548 | extern void blk_integrity_unregister(struct gendisk *); |
Martin K. Petersen | ad7fce9 | 2008-10-01 03:38:39 -0400 | [diff] [blame] | 1549 | extern int blk_integrity_compare(struct gendisk *, struct gendisk *); |
Martin K. Petersen | 13f05c8 | 2010-09-10 20:50:10 +0200 | [diff] [blame] | 1550 | extern int blk_rq_map_integrity_sg(struct request_queue *, struct bio *, |
| 1551 | struct scatterlist *); |
| 1552 | extern int blk_rq_count_integrity_sg(struct request_queue *, struct bio *); |
Martin K. Petersen | 4eaf99b | 2014-09-26 19:20:06 -0400 | [diff] [blame] | 1553 | extern bool blk_integrity_merge_rq(struct request_queue *, struct request *, |
| 1554 | struct request *); |
| 1555 | extern bool blk_integrity_merge_bio(struct request_queue *, struct request *, |
| 1556 | struct bio *); |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 1557 | |
Martin K. Petersen | 25520d5 | 2015-10-21 13:19:49 -0400 | [diff] [blame] | 1558 | static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk) |
| 1559 | { |
Dan Williams | ac6fc48 | 2015-10-21 13:20:18 -0400 | [diff] [blame] | 1560 | struct blk_integrity *bi = &disk->queue->integrity; |
Martin K. Petersen | 25520d5 | 2015-10-21 13:19:49 -0400 | [diff] [blame] | 1561 | |
| 1562 | if (!bi->profile) |
| 1563 | return NULL; |
| 1564 | |
| 1565 | return bi; |
| 1566 | } |
| 1567 | |
Jens Axboe | b04accc | 2008-10-02 12:53:22 +0200 | [diff] [blame] | 1568 | static inline |
| 1569 | struct blk_integrity *bdev_get_integrity(struct block_device *bdev) |
| 1570 | { |
Martin K. Petersen | 25520d5 | 2015-10-21 13:19:49 -0400 | [diff] [blame] | 1571 | return blk_get_integrity(bdev->bd_disk); |
Martin K. Petersen | b02739b | 2008-10-02 18:47:49 +0200 | [diff] [blame] | 1572 | } |
| 1573 | |
Martin K. Petersen | 180b2f9 | 2014-09-26 19:19:56 -0400 | [diff] [blame] | 1574 | static inline bool blk_integrity_rq(struct request *rq) |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 1575 | { |
Martin K. Petersen | 180b2f9 | 2014-09-26 19:19:56 -0400 | [diff] [blame] | 1576 | return rq->cmd_flags & REQ_INTEGRITY; |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 1577 | } |
| 1578 | |
Martin K. Petersen | 13f05c8 | 2010-09-10 20:50:10 +0200 | [diff] [blame] | 1579 | static inline void blk_queue_max_integrity_segments(struct request_queue *q, |
| 1580 | unsigned int segs) |
| 1581 | { |
| 1582 | q->limits.max_integrity_segments = segs; |
| 1583 | } |
| 1584 | |
| 1585 | static inline unsigned short |
| 1586 | queue_max_integrity_segments(struct request_queue *q) |
| 1587 | { |
| 1588 | return q->limits.max_integrity_segments; |
| 1589 | } |
| 1590 | |
Sagi Grimberg | 7f39add | 2015-09-11 09:03:04 -0600 | [diff] [blame] | 1591 | static inline bool integrity_req_gap_back_merge(struct request *req, |
| 1592 | struct bio *next) |
| 1593 | { |
| 1594 | struct bio_integrity_payload *bip = bio_integrity(req->bio); |
| 1595 | struct bio_integrity_payload *bip_next = bio_integrity(next); |
| 1596 | |
| 1597 | return bvec_gap_to_prev(req->q, &bip->bip_vec[bip->bip_vcnt - 1], |
| 1598 | bip_next->bip_vec[0].bv_offset); |
| 1599 | } |
| 1600 | |
| 1601 | static inline bool integrity_req_gap_front_merge(struct request *req, |
| 1602 | struct bio *bio) |
| 1603 | { |
| 1604 | struct bio_integrity_payload *bip = bio_integrity(bio); |
| 1605 | struct bio_integrity_payload *bip_next = bio_integrity(req->bio); |
| 1606 | |
| 1607 | return bvec_gap_to_prev(req->q, &bip->bip_vec[bip->bip_vcnt - 1], |
| 1608 | bip_next->bip_vec[0].bv_offset); |
| 1609 | } |
| 1610 | |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 1611 | #else /* CONFIG_BLK_DEV_INTEGRITY */ |
| 1612 | |
Stephen Rothwell | fd83240 | 2012-01-12 09:17:30 +0100 | [diff] [blame] | 1613 | struct bio; |
| 1614 | struct block_device; |
| 1615 | struct gendisk; |
| 1616 | struct blk_integrity; |
| 1617 | |
| 1618 | static inline int blk_integrity_rq(struct request *rq) |
| 1619 | { |
| 1620 | return 0; |
| 1621 | } |
| 1622 | static inline int blk_rq_count_integrity_sg(struct request_queue *q, |
| 1623 | struct bio *b) |
| 1624 | { |
| 1625 | return 0; |
| 1626 | } |
| 1627 | static inline int blk_rq_map_integrity_sg(struct request_queue *q, |
| 1628 | struct bio *b, |
| 1629 | struct scatterlist *s) |
| 1630 | { |
| 1631 | return 0; |
| 1632 | } |
| 1633 | static inline struct blk_integrity *bdev_get_integrity(struct block_device *b) |
| 1634 | { |
Michele Curti | 61a04e5 | 2014-10-09 15:30:17 -0700 | [diff] [blame] | 1635 | return NULL; |
Stephen Rothwell | fd83240 | 2012-01-12 09:17:30 +0100 | [diff] [blame] | 1636 | } |
| 1637 | static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk) |
| 1638 | { |
| 1639 | return NULL; |
| 1640 | } |
| 1641 | static inline int blk_integrity_compare(struct gendisk *a, struct gendisk *b) |
| 1642 | { |
| 1643 | return 0; |
| 1644 | } |
Martin K. Petersen | 25520d5 | 2015-10-21 13:19:49 -0400 | [diff] [blame] | 1645 | static inline void blk_integrity_register(struct gendisk *d, |
Stephen Rothwell | fd83240 | 2012-01-12 09:17:30 +0100 | [diff] [blame] | 1646 | struct blk_integrity *b) |
| 1647 | { |
Stephen Rothwell | fd83240 | 2012-01-12 09:17:30 +0100 | [diff] [blame] | 1648 | } |
| 1649 | static inline void blk_integrity_unregister(struct gendisk *d) |
| 1650 | { |
| 1651 | } |
| 1652 | static inline void blk_queue_max_integrity_segments(struct request_queue *q, |
| 1653 | unsigned int segs) |
| 1654 | { |
| 1655 | } |
| 1656 | static inline unsigned short queue_max_integrity_segments(struct request_queue *q) |
| 1657 | { |
| 1658 | return 0; |
| 1659 | } |
Martin K. Petersen | 4eaf99b | 2014-09-26 19:20:06 -0400 | [diff] [blame] | 1660 | static inline bool blk_integrity_merge_rq(struct request_queue *rq, |
| 1661 | struct request *r1, |
| 1662 | struct request *r2) |
Stephen Rothwell | fd83240 | 2012-01-12 09:17:30 +0100 | [diff] [blame] | 1663 | { |
Martin K. Petersen | cb1a5ab | 2014-10-28 20:27:43 -0600 | [diff] [blame] | 1664 | return true; |
Stephen Rothwell | fd83240 | 2012-01-12 09:17:30 +0100 | [diff] [blame] | 1665 | } |
Martin K. Petersen | 4eaf99b | 2014-09-26 19:20:06 -0400 | [diff] [blame] | 1666 | static inline bool blk_integrity_merge_bio(struct request_queue *rq, |
| 1667 | struct request *r, |
| 1668 | struct bio *b) |
Stephen Rothwell | fd83240 | 2012-01-12 09:17:30 +0100 | [diff] [blame] | 1669 | { |
Martin K. Petersen | cb1a5ab | 2014-10-28 20:27:43 -0600 | [diff] [blame] | 1670 | return true; |
Stephen Rothwell | fd83240 | 2012-01-12 09:17:30 +0100 | [diff] [blame] | 1671 | } |
Martin K. Petersen | 25520d5 | 2015-10-21 13:19:49 -0400 | [diff] [blame] | 1672 | |
Sagi Grimberg | 7f39add | 2015-09-11 09:03:04 -0600 | [diff] [blame] | 1673 | static inline bool integrity_req_gap_back_merge(struct request *req, |
| 1674 | struct bio *next) |
| 1675 | { |
| 1676 | return false; |
| 1677 | } |
| 1678 | static inline bool integrity_req_gap_front_merge(struct request *req, |
| 1679 | struct bio *bio) |
| 1680 | { |
| 1681 | return false; |
| 1682 | } |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 1683 | |
| 1684 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ |
| 1685 | |
Dan Williams | b2e0d16 | 2016-01-15 16:55:59 -0800 | [diff] [blame] | 1686 | /** |
| 1687 | * struct blk_dax_ctl - control and output parameters for ->direct_access |
| 1688 | * @sector: (input) offset relative to a block_device |
| 1689 | * @addr: (output) kernel virtual address for @sector populated by driver |
| 1690 | * @pfn: (output) page frame number for @addr populated by driver |
| 1691 | * @size: (input) number of bytes requested |
| 1692 | */ |
| 1693 | struct blk_dax_ctl { |
| 1694 | sector_t sector; |
Dan Williams | 7a9eb20 | 2016-06-03 18:06:47 -0700 | [diff] [blame] | 1695 | void *addr; |
Dan Williams | b2e0d16 | 2016-01-15 16:55:59 -0800 | [diff] [blame] | 1696 | long size; |
Dan Williams | 34c0fd5 | 2016-01-15 16:56:14 -0800 | [diff] [blame] | 1697 | pfn_t pfn; |
Dan Williams | b2e0d16 | 2016-01-15 16:55:59 -0800 | [diff] [blame] | 1698 | }; |
| 1699 | |
Al Viro | 08f8585 | 2007-10-08 13:26:20 -0400 | [diff] [blame] | 1700 | struct block_device_operations { |
Al Viro | d4430d62 | 2008-03-02 09:09:22 -0500 | [diff] [blame] | 1701 | int (*open) (struct block_device *, fmode_t); |
Al Viro | db2a144 | 2013-05-05 21:52:57 -0400 | [diff] [blame] | 1702 | void (*release) (struct gendisk *, fmode_t); |
Jens Axboe | c11f0c0 | 2016-08-05 08:11:04 -0600 | [diff] [blame] | 1703 | int (*rw_page)(struct block_device *, sector_t, struct page *, bool); |
Al Viro | d4430d62 | 2008-03-02 09:09:22 -0500 | [diff] [blame] | 1704 | int (*ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); |
| 1705 | int (*compat_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); |
Dan Williams | 7a9eb20 | 2016-06-03 18:06:47 -0700 | [diff] [blame] | 1706 | long (*direct_access)(struct block_device *, sector_t, void **, pfn_t *, |
| 1707 | long); |
Tejun Heo | 77ea887 | 2010-12-08 20:57:37 +0100 | [diff] [blame] | 1708 | unsigned int (*check_events) (struct gendisk *disk, |
| 1709 | unsigned int clearing); |
| 1710 | /* ->media_changed() is DEPRECATED, use ->check_events() instead */ |
Al Viro | 08f8585 | 2007-10-08 13:26:20 -0400 | [diff] [blame] | 1711 | int (*media_changed) (struct gendisk *); |
Tejun Heo | c3e33e0 | 2010-05-15 20:09:29 +0200 | [diff] [blame] | 1712 | void (*unlock_native_capacity) (struct gendisk *); |
Al Viro | 08f8585 | 2007-10-08 13:26:20 -0400 | [diff] [blame] | 1713 | int (*revalidate_disk) (struct gendisk *); |
| 1714 | int (*getgeo)(struct block_device *, struct hd_geometry *); |
Nitin Gupta | b3a27d0 | 2010-05-17 11:02:43 +0530 | [diff] [blame] | 1715 | /* this callback is with swap_lock and sometimes page table lock held */ |
| 1716 | void (*swap_slot_free_notify) (struct block_device *, unsigned long); |
Al Viro | 08f8585 | 2007-10-08 13:26:20 -0400 | [diff] [blame] | 1717 | struct module *owner; |
Christoph Hellwig | bbd3e06 | 2015-10-15 14:10:48 +0200 | [diff] [blame] | 1718 | const struct pr_ops *pr_ops; |
Al Viro | 08f8585 | 2007-10-08 13:26:20 -0400 | [diff] [blame] | 1719 | }; |
| 1720 | |
Al Viro | 633a08b | 2007-08-29 20:34:12 -0400 | [diff] [blame] | 1721 | extern int __blkdev_driver_ioctl(struct block_device *, fmode_t, unsigned int, |
| 1722 | unsigned long); |
Matthew Wilcox | 47a191f | 2014-06-04 16:07:46 -0700 | [diff] [blame] | 1723 | extern int bdev_read_page(struct block_device *, sector_t, struct page *); |
| 1724 | extern int bdev_write_page(struct block_device *, sector_t, struct page *, |
| 1725 | struct writeback_control *); |
Dan Williams | b2e0d16 | 2016-01-15 16:55:59 -0800 | [diff] [blame] | 1726 | extern long bdev_direct_access(struct block_device *, struct blk_dax_ctl *); |
Toshi Kani | 2d96afc | 2016-05-10 10:23:53 -0600 | [diff] [blame] | 1727 | extern int bdev_dax_supported(struct super_block *, int); |
Toshi Kani | a8078b1 | 2016-05-10 10:23:57 -0600 | [diff] [blame] | 1728 | extern bool bdev_dax_capable(struct block_device *); |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 1729 | #else /* CONFIG_BLOCK */ |
Fabian Frederick | ac13a82 | 2014-06-04 16:06:27 -0700 | [diff] [blame] | 1730 | |
| 1731 | struct block_device; |
| 1732 | |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 1733 | /* |
| 1734 | * stubs for when the block layer is configured out |
| 1735 | */ |
| 1736 | #define buffer_heads_over_limit 0 |
| 1737 | |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 1738 | static inline long nr_blockdev_pages(void) |
| 1739 | { |
| 1740 | return 0; |
| 1741 | } |
| 1742 | |
Jens Axboe | 1f940bd | 2011-03-11 20:17:08 +0100 | [diff] [blame] | 1743 | struct blk_plug { |
| 1744 | }; |
| 1745 | |
| 1746 | static inline void blk_start_plug(struct blk_plug *plug) |
Jens Axboe | 73c1010 | 2011-03-08 13:19:51 +0100 | [diff] [blame] | 1747 | { |
| 1748 | } |
| 1749 | |
Jens Axboe | 1f940bd | 2011-03-11 20:17:08 +0100 | [diff] [blame] | 1750 | static inline void blk_finish_plug(struct blk_plug *plug) |
Jens Axboe | 73c1010 | 2011-03-08 13:19:51 +0100 | [diff] [blame] | 1751 | { |
| 1752 | } |
| 1753 | |
Jens Axboe | 1f940bd | 2011-03-11 20:17:08 +0100 | [diff] [blame] | 1754 | static inline void blk_flush_plug(struct task_struct *task) |
Jens Axboe | 73c1010 | 2011-03-08 13:19:51 +0100 | [diff] [blame] | 1755 | { |
| 1756 | } |
| 1757 | |
Jens Axboe | a237c1c | 2011-04-16 13:27:55 +0200 | [diff] [blame] | 1758 | static inline void blk_schedule_flush_plug(struct task_struct *task) |
| 1759 | { |
| 1760 | } |
| 1761 | |
| 1762 | |
Jens Axboe | 73c1010 | 2011-03-08 13:19:51 +0100 | [diff] [blame] | 1763 | static inline bool blk_needs_flush_plug(struct task_struct *tsk) |
| 1764 | { |
| 1765 | return false; |
| 1766 | } |
| 1767 | |
Fabian Frederick | ac13a82 | 2014-06-04 16:06:27 -0700 | [diff] [blame] | 1768 | static inline int blkdev_issue_flush(struct block_device *bdev, gfp_t gfp_mask, |
| 1769 | sector_t *error_sector) |
| 1770 | { |
| 1771 | return 0; |
| 1772 | } |
| 1773 | |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 1774 | #endif /* CONFIG_BLOCK */ |
| 1775 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1776 | #endif |