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> |
| 15 | #include <linux/backing-dev.h> |
| 16 | #include <linux/wait.h> |
| 17 | #include <linux/mempool.h> |
| 18 | #include <linux/bio.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | #include <linux/stringify.h> |
Hugh Dickins | 3e6053d | 2008-09-11 10:57:55 +0200 | [diff] [blame] | 20 | #include <linux/gfp.h> |
FUJITA Tomonori | d351af0 | 2007-07-09 12:40:35 +0200 | [diff] [blame] | 21 | #include <linux/bsg.h> |
Jens Axboe | c7c22e4 | 2008-09-13 20:26:01 +0200 | [diff] [blame] | 22 | #include <linux/smp.h> |
Tejun Heo | 548bc8e | 2013-01-09 08:05:13 -0800 | [diff] [blame] | 23 | #include <linux/rcupdate.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | |
| 25 | #include <asm/scatterlist.h> |
| 26 | |
Paul Gortmaker | de47725 | 2011-05-26 13:46:22 -0400 | [diff] [blame] | 27 | struct module; |
Christoph Hellwig | 21b2f0c | 2006-03-22 17:52:04 +0100 | [diff] [blame] | 28 | struct scsi_ioctl_command; |
| 29 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | struct request_queue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | struct elevator_queue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | struct request_pm_state; |
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; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | |
| 39 | #define BLKDEV_MIN_RQ 4 |
| 40 | #define BLKDEV_MAX_RQ 128 /* Default maximum */ |
| 41 | |
Tejun Heo | 8bd435b | 2012-04-13 13:11:28 -0700 | [diff] [blame] | 42 | /* |
| 43 | * Maximum number of blkcg policies allowed to be registered concurrently. |
| 44 | * Defined here to simplify include dependency. |
| 45 | */ |
| 46 | #define BLKCG_MAX_POLS 2 |
| 47 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | struct request; |
Tejun Heo | 8ffdc65 | 2006-01-06 09:49:03 +0100 | [diff] [blame] | 49 | typedef void (rq_end_io_fn)(struct request *, int); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | |
Tejun Heo | 5b788ce | 2012-06-04 20:40:59 -0700 | [diff] [blame] | 51 | #define BLK_RL_SYNCFULL (1U << 0) |
| 52 | #define BLK_RL_ASYNCFULL (1U << 1) |
| 53 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | struct request_list { |
Tejun Heo | 5b788ce | 2012-06-04 20:40:59 -0700 | [diff] [blame] | 55 | struct request_queue *q; /* the queue this rl belongs to */ |
Tejun Heo | a051661 | 2012-06-26 15:05:44 -0700 | [diff] [blame] | 56 | #ifdef CONFIG_BLK_CGROUP |
| 57 | struct blkcg_gq *blkg; /* blkg this request pool belongs to */ |
| 58 | #endif |
Jens Axboe | 1faa16d | 2009-04-06 14:48:01 +0200 | [diff] [blame] | 59 | /* |
| 60 | * count[], starved[], and wait[] are indexed by |
| 61 | * BLK_RW_SYNC/BLK_RW_ASYNC |
| 62 | */ |
Tejun Heo | 8a5ecdd | 2012-06-04 20:40:58 -0700 | [diff] [blame] | 63 | int count[2]; |
| 64 | int starved[2]; |
| 65 | mempool_t *rq_pool; |
| 66 | wait_queue_head_t wait[2]; |
Tejun Heo | 5b788ce | 2012-06-04 20:40:59 -0700 | [diff] [blame] | 67 | unsigned int flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | }; |
| 69 | |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 70 | /* |
| 71 | * request command types |
| 72 | */ |
| 73 | enum rq_cmd_type_bits { |
| 74 | REQ_TYPE_FS = 1, /* fs request */ |
| 75 | REQ_TYPE_BLOCK_PC, /* scsi command */ |
| 76 | REQ_TYPE_SENSE, /* sense request */ |
| 77 | REQ_TYPE_PM_SUSPEND, /* suspend request */ |
| 78 | REQ_TYPE_PM_RESUME, /* resume request */ |
| 79 | REQ_TYPE_PM_SHUTDOWN, /* shutdown request */ |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 80 | REQ_TYPE_SPECIAL, /* driver defined type */ |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 81 | /* |
| 82 | * for ATA/ATAPI devices. this really doesn't belong here, ide should |
| 83 | * use REQ_TYPE_SPECIAL and use rq->cmd[0] with the range of driver |
| 84 | * private REQ_LB opcodes to differentiate what type of request this is |
| 85 | */ |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 86 | REQ_TYPE_ATA_TASKFILE, |
Jens Axboe | cea2885 | 2006-10-12 15:08:45 +0200 | [diff] [blame] | 87 | REQ_TYPE_ATA_PC, |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 88 | }; |
| 89 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 90 | #define BLK_MAX_CDB 16 |
| 91 | |
| 92 | /* |
Christoph Hellwig | af76e55 | 2014-05-06 12:12:45 +0200 | [diff] [blame] | 93 | * Try to put the fields that are referenced together in the same cacheline. |
| 94 | * |
| 95 | * If you modify this structure, make sure to update blk_rq_init() and |
| 96 | * 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] | 97 | */ |
| 98 | struct request { |
Christoph Hellwig | 6897fc2 | 2014-01-30 15:45:47 -0800 | [diff] [blame] | 99 | struct list_head queuelist; |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 100 | union { |
| 101 | struct call_single_data csd; |
Jan Kara | 8b4922d | 2014-02-24 16:39:52 +0100 | [diff] [blame] | 102 | unsigned long fifo_time; |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 103 | }; |
Jens Axboe | ff856ba | 2006-01-09 16:02:34 +0100 | [diff] [blame] | 104 | |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 105 | struct request_queue *q; |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 106 | struct blk_mq_ctx *mq_ctx; |
Jens Axboe | e6a1c87 | 2006-08-10 09:00:21 +0200 | [diff] [blame] | 107 | |
Jens Axboe | 5953316 | 2013-05-23 12:25:08 +0200 | [diff] [blame] | 108 | u64 cmd_flags; |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 109 | enum rq_cmd_type_bits cmd_type; |
Jens Axboe | 242f9dc | 2008-09-14 05:55:09 -0700 | [diff] [blame] | 110 | unsigned long atomic_flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | |
Richard Kennedy | 181fdde | 2010-03-19 08:58:16 +0100 | [diff] [blame] | 112 | int cpu; |
| 113 | |
Tejun Heo | a2dec7b | 2009-05-07 22:24:44 +0900 | [diff] [blame] | 114 | /* the following two fields are internal, NEVER access directly */ |
Tejun Heo | a2dec7b | 2009-05-07 22:24:44 +0900 | [diff] [blame] | 115 | unsigned int __data_len; /* total data len */ |
Richard Kennedy | 181fdde | 2010-03-19 08:58:16 +0100 | [diff] [blame] | 116 | sector_t __sector; /* sector cursor */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 117 | |
| 118 | struct bio *bio; |
| 119 | struct bio *biotail; |
| 120 | |
Jens Axboe | 360f92c | 2014-04-09 20:27:01 -0600 | [diff] [blame] | 121 | /* |
| 122 | * The hash is used inside the scheduler, and killed once the |
| 123 | * request reaches the dispatch list. The ipi_list is only used |
| 124 | * to queue the request for softirq completion, which is long |
| 125 | * after the request has been unhashed (and even removed from |
| 126 | * the dispatch list). |
| 127 | */ |
| 128 | union { |
| 129 | struct hlist_node hash; /* merge hash */ |
| 130 | struct list_head ipi_list; |
| 131 | }; |
| 132 | |
Jens Axboe | e6a1c87 | 2006-08-10 09:00:21 +0200 | [diff] [blame] | 133 | /* |
| 134 | * The rb_node is only used inside the io scheduler, requests |
| 135 | * are pruned when moved to the dispatch queue. So let the |
Mike Snitzer | c186794 | 2011-02-11 11:08:00 +0100 | [diff] [blame] | 136 | * completion_data share space with the rb_node. |
Jens Axboe | e6a1c87 | 2006-08-10 09:00:21 +0200 | [diff] [blame] | 137 | */ |
| 138 | union { |
| 139 | struct rb_node rb_node; /* sort/lookup */ |
Mike Snitzer | c186794 | 2011-02-11 11:08:00 +0100 | [diff] [blame] | 140 | void *completion_data; |
Jens Axboe | e6a1c87 | 2006-08-10 09:00:21 +0200 | [diff] [blame] | 141 | }; |
Jens Axboe | 9817064 | 2006-07-28 09:23:08 +0200 | [diff] [blame] | 142 | |
Jens Axboe | ff7d145 | 2006-07-12 14:04:37 +0200 | [diff] [blame] | 143 | /* |
Vivek Goyal | 7f1dc8a | 2010-04-21 17:44:16 +0200 | [diff] [blame] | 144 | * Three pointers are available for the IO schedulers, if they need |
Mike Snitzer | c186794 | 2011-02-11 11:08:00 +0100 | [diff] [blame] | 145 | * more they have to dynamically allocate it. Flush requests are |
| 146 | * never put on the IO scheduler. So let the flush fields share |
Tejun Heo | a612fdd | 2011-12-14 00:33:41 +0100 | [diff] [blame] | 147 | * space with the elevator data. |
Jens Axboe | ff7d145 | 2006-07-12 14:04:37 +0200 | [diff] [blame] | 148 | */ |
Mike Snitzer | c186794 | 2011-02-11 11:08:00 +0100 | [diff] [blame] | 149 | union { |
Tejun Heo | a612fdd | 2011-12-14 00:33:41 +0100 | [diff] [blame] | 150 | struct { |
| 151 | struct io_cq *icq; |
| 152 | void *priv[2]; |
| 153 | } elv; |
| 154 | |
Mike Snitzer | c186794 | 2011-02-11 11:08:00 +0100 | [diff] [blame] | 155 | struct { |
| 156 | unsigned int seq; |
| 157 | struct list_head list; |
Jeff Moyer | 4853aba | 2011-08-15 21:37:25 +0200 | [diff] [blame] | 158 | rq_end_io_fn *saved_end_io; |
Mike Snitzer | c186794 | 2011-02-11 11:08:00 +0100 | [diff] [blame] | 159 | } flush; |
| 160 | }; |
Jens Axboe | ff7d145 | 2006-07-12 14:04:37 +0200 | [diff] [blame] | 161 | |
Jens Axboe | 8f34ee7 | 2006-06-13 09:02:34 +0200 | [diff] [blame] | 162 | struct gendisk *rq_disk; |
Jerome Marchand | 09e099d | 2011-01-05 16:57:38 +0100 | [diff] [blame] | 163 | struct hd_struct *part; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 164 | unsigned long start_time; |
Divyesh Shah | 9195291 | 2010-04-01 15:01:41 -0700 | [diff] [blame] | 165 | #ifdef CONFIG_BLK_CGROUP |
Tejun Heo | a051661 | 2012-06-26 15:05:44 -0700 | [diff] [blame] | 166 | struct request_list *rl; /* rl this rq is alloced from */ |
Divyesh Shah | 9195291 | 2010-04-01 15:01:41 -0700 | [diff] [blame] | 167 | unsigned long long start_time_ns; |
| 168 | unsigned long long io_start_time_ns; /* when passed to hardware */ |
| 169 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 170 | /* Number of scatter-gather DMA addr+len pairs after |
| 171 | * physical address coalescing is performed. |
| 172 | */ |
| 173 | unsigned short nr_phys_segments; |
Martin K. Petersen | 13f05c8 | 2010-09-10 20:50:10 +0200 | [diff] [blame] | 174 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
| 175 | unsigned short nr_integrity_segments; |
| 176 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 177 | |
Jens Axboe | 8f34ee7 | 2006-06-13 09:02:34 +0200 | [diff] [blame] | 178 | unsigned short ioprio; |
| 179 | |
Tejun Heo | 731ec49 | 2009-04-23 11:05:20 +0900 | [diff] [blame] | 180 | void *special; /* opaque pointer available for LLD use */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 181 | |
Jens Axboe | cdd6026 | 2006-07-28 09:32:07 +0200 | [diff] [blame] | 182 | int tag; |
| 183 | int errors; |
| 184 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 185 | /* |
| 186 | * when request is used as a packet command carrier |
| 187 | */ |
FUJITA Tomonori | d7e3c32 | 2008-04-29 09:54:39 +0200 | [diff] [blame] | 188 | unsigned char __cmd[BLK_MAX_CDB]; |
| 189 | unsigned char *cmd; |
Richard Kennedy | 181fdde | 2010-03-19 08:58:16 +0100 | [diff] [blame] | 190 | unsigned short cmd_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 191 | |
FUJITA Tomonori | 7a85f88 | 2008-03-04 11:17:11 +0100 | [diff] [blame] | 192 | unsigned int extra_len; /* length of alignment and padding */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 193 | unsigned int sense_len; |
Tejun Heo | c3a4d78 | 2009-05-07 22:24:37 +0900 | [diff] [blame] | 194 | unsigned int resid_len; /* residual count */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 195 | void *sense; |
| 196 | |
Jens Axboe | 242f9dc | 2008-09-14 05:55:09 -0700 | [diff] [blame] | 197 | unsigned long deadline; |
| 198 | struct list_head timeout_list; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 199 | unsigned int timeout; |
Mike Christie | 17e01f2 | 2005-11-11 05:31:37 -0600 | [diff] [blame] | 200 | int retries; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 201 | |
| 202 | /* |
Jens Axboe | c00895a | 2006-09-30 20:29:12 +0200 | [diff] [blame] | 203 | * completion callback. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 204 | */ |
| 205 | rq_end_io_fn *end_io; |
| 206 | void *end_io_data; |
FUJITA Tomonori | abae1fd | 2007-07-16 08:52:14 +0200 | [diff] [blame] | 207 | |
| 208 | /* for bidi */ |
| 209 | struct request *next_rq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 210 | }; |
| 211 | |
Fernando Luis Vázquez Cao | 766ca44 | 2008-08-14 09:59:13 +0200 | [diff] [blame] | 212 | static inline unsigned short req_get_ioprio(struct request *req) |
| 213 | { |
| 214 | return req->ioprio; |
| 215 | } |
| 216 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 217 | /* |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 218 | * State information carried for REQ_TYPE_PM_SUSPEND and REQ_TYPE_PM_RESUME |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 219 | * requests. Some step values could eventually be made generic. |
| 220 | */ |
| 221 | struct request_pm_state |
| 222 | { |
| 223 | /* PM state machine step value, currently driver specific */ |
| 224 | int pm_step; |
| 225 | /* requested PM state value (S1, S2, S3, S4, ...) */ |
| 226 | u32 pm_state; |
| 227 | void* data; /* for driver use */ |
| 228 | }; |
| 229 | |
| 230 | #include <linux/elevator.h> |
| 231 | |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 232 | struct blk_queue_ctx; |
| 233 | |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 234 | typedef void (request_fn_proc) (struct request_queue *q); |
Christoph Hellwig | 5a7bbad | 2011-09-12 12:12:01 +0200 | [diff] [blame] | 235 | typedef void (make_request_fn) (struct request_queue *q, struct bio *bio); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 236 | typedef int (prep_rq_fn) (struct request_queue *, struct request *); |
James Bottomley | 28018c2 | 2010-07-01 19:49:17 +0900 | [diff] [blame] | 237 | typedef void (unprep_rq_fn) (struct request_queue *, struct request *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 238 | |
| 239 | struct bio_vec; |
Alasdair G Kergon | cc371e6 | 2008-07-03 09:53:43 +0200 | [diff] [blame] | 240 | struct bvec_merge_data { |
| 241 | struct block_device *bi_bdev; |
| 242 | sector_t bi_sector; |
| 243 | unsigned bi_size; |
| 244 | unsigned long bi_rw; |
| 245 | }; |
| 246 | typedef int (merge_bvec_fn) (struct request_queue *, struct bvec_merge_data *, |
| 247 | struct bio_vec *); |
Jens Axboe | ff856ba | 2006-01-09 16:02:34 +0100 | [diff] [blame] | 248 | typedef void (softirq_done_fn)(struct request *); |
Tejun Heo | 2fb98e8 | 2008-02-19 11:36:53 +0100 | [diff] [blame] | 249 | typedef int (dma_drain_needed_fn)(struct request *); |
Kiyoshi Ueda | ef9e3fa | 2008-10-01 16:12:15 +0200 | [diff] [blame] | 250 | typedef int (lld_busy_fn) (struct request_queue *q); |
Mike Christie | aa387cc | 2011-07-31 22:05:09 +0200 | [diff] [blame] | 251 | typedef int (bsg_job_fn) (struct bsg_job *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 252 | |
Jens Axboe | 242f9dc | 2008-09-14 05:55:09 -0700 | [diff] [blame] | 253 | enum blk_eh_timer_return { |
| 254 | BLK_EH_NOT_HANDLED, |
| 255 | BLK_EH_HANDLED, |
| 256 | BLK_EH_RESET_TIMER, |
| 257 | }; |
| 258 | |
| 259 | typedef enum blk_eh_timer_return (rq_timed_out_fn)(struct request *); |
| 260 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 261 | enum blk_queue_state { |
| 262 | Queue_down, |
| 263 | Queue_up, |
| 264 | }; |
| 265 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 266 | struct blk_queue_tag { |
| 267 | struct request **tag_index; /* map of busy tags */ |
| 268 | unsigned long *tag_map; /* bit map of free/busy tags */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | int busy; /* current depth */ |
| 270 | int max_depth; /* what we will send to device */ |
Tejun Heo | ba02508 | 2005-08-05 13:28:11 -0700 | [diff] [blame] | 271 | int real_max_depth; /* what the array can hold */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 272 | atomic_t refcnt; /* map can be shared */ |
| 273 | }; |
| 274 | |
FUJITA Tomonori | abf5439 | 2008-08-16 14:10:05 +0900 | [diff] [blame] | 275 | #define BLK_SCSI_MAX_CMDS (256) |
| 276 | #define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8)) |
| 277 | |
Martin K. Petersen | 025146e | 2009-05-22 17:17:51 -0400 | [diff] [blame] | 278 | struct queue_limits { |
| 279 | unsigned long bounce_pfn; |
| 280 | unsigned long seg_boundary_mask; |
| 281 | |
| 282 | unsigned int max_hw_sectors; |
Jens Axboe | 762380a | 2014-06-05 13:38:39 -0600 | [diff] [blame] | 283 | unsigned int chunk_sectors; |
Martin K. Petersen | 025146e | 2009-05-22 17:17:51 -0400 | [diff] [blame] | 284 | unsigned int max_sectors; |
| 285 | unsigned int max_segment_size; |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 286 | unsigned int physical_block_size; |
| 287 | unsigned int alignment_offset; |
| 288 | unsigned int io_min; |
| 289 | unsigned int io_opt; |
Christoph Hellwig | 67efc92 | 2009-09-30 13:54:20 +0200 | [diff] [blame] | 290 | unsigned int max_discard_sectors; |
Martin K. Petersen | 4363ac7 | 2012-09-18 12:19:27 -0400 | [diff] [blame] | 291 | unsigned int max_write_same_sectors; |
Martin K. Petersen | 86b3728 | 2009-11-10 11:50:21 +0100 | [diff] [blame] | 292 | unsigned int discard_granularity; |
| 293 | unsigned int discard_alignment; |
Martin K. Petersen | 025146e | 2009-05-22 17:17:51 -0400 | [diff] [blame] | 294 | |
| 295 | unsigned short logical_block_size; |
Martin K. Petersen | 8a78362 | 2010-02-26 00:20:39 -0500 | [diff] [blame] | 296 | unsigned short max_segments; |
Martin K. Petersen | 13f05c8 | 2010-09-10 20:50:10 +0200 | [diff] [blame] | 297 | unsigned short max_integrity_segments; |
Martin K. Petersen | 025146e | 2009-05-22 17:17:51 -0400 | [diff] [blame] | 298 | |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 299 | unsigned char misaligned; |
Martin K. Petersen | 86b3728 | 2009-11-10 11:50:21 +0100 | [diff] [blame] | 300 | unsigned char discard_misaligned; |
Martin K. Petersen | e692cb6 | 2010-12-01 19:41:49 +0100 | [diff] [blame] | 301 | unsigned char cluster; |
Martin K. Petersen | a934a00 | 2011-05-18 10:37:35 +0200 | [diff] [blame] | 302 | unsigned char discard_zeroes_data; |
Kent Overstreet | c78afc6 | 2013-07-11 22:39:53 -0700 | [diff] [blame] | 303 | unsigned char raid_partial_stripes_expensive; |
Martin K. Petersen | 025146e | 2009-05-22 17:17:51 -0400 | [diff] [blame] | 304 | }; |
| 305 | |
Richard Kennedy | d7b7630 | 2011-07-13 21:17:23 +0200 | [diff] [blame] | 306 | struct request_queue { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 307 | /* |
| 308 | * Together with queue_head for cacheline sharing |
| 309 | */ |
| 310 | struct list_head queue_head; |
| 311 | struct request *last_merge; |
Jens Axboe | b374d18 | 2008-10-31 10:05:07 +0100 | [diff] [blame] | 312 | struct elevator_queue *elevator; |
Tejun Heo | 8a5ecdd | 2012-06-04 20:40:58 -0700 | [diff] [blame] | 313 | int nr_rqs[2]; /* # allocated [a]sync rqs */ |
| 314 | int nr_rqs_elvpriv; /* # allocated rqs w/ elvpriv */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 315 | |
| 316 | /* |
Tejun Heo | a051661 | 2012-06-26 15:05:44 -0700 | [diff] [blame] | 317 | * If blkcg is not used, @q->root_rl serves all requests. If blkcg |
| 318 | * is used, root blkg allocates from @q->root_rl and all other |
| 319 | * blkgs from their own blkg->rl. Which one to use should be |
| 320 | * determined using bio_request_list(). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 321 | */ |
Tejun Heo | a051661 | 2012-06-26 15:05:44 -0700 | [diff] [blame] | 322 | struct request_list root_rl; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 323 | |
| 324 | request_fn_proc *request_fn; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 325 | make_request_fn *make_request_fn; |
| 326 | prep_rq_fn *prep_rq_fn; |
James Bottomley | 28018c2 | 2010-07-01 19:49:17 +0900 | [diff] [blame] | 327 | unprep_rq_fn *unprep_rq_fn; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 328 | merge_bvec_fn *merge_bvec_fn; |
Jens Axboe | ff856ba | 2006-01-09 16:02:34 +0100 | [diff] [blame] | 329 | softirq_done_fn *softirq_done_fn; |
Jens Axboe | 242f9dc | 2008-09-14 05:55:09 -0700 | [diff] [blame] | 330 | rq_timed_out_fn *rq_timed_out_fn; |
Tejun Heo | 2fb98e8 | 2008-02-19 11:36:53 +0100 | [diff] [blame] | 331 | dma_drain_needed_fn *dma_drain_needed; |
Kiyoshi Ueda | ef9e3fa | 2008-10-01 16:12:15 +0200 | [diff] [blame] | 332 | lld_busy_fn *lld_busy_fn; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 333 | |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 334 | struct blk_mq_ops *mq_ops; |
| 335 | |
| 336 | unsigned int *mq_map; |
| 337 | |
| 338 | /* sw queues */ |
Ming Lei | e6cdb09 | 2014-06-03 11:24:06 +0800 | [diff] [blame] | 339 | struct blk_mq_ctx __percpu *queue_ctx; |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 340 | unsigned int nr_queues; |
| 341 | |
| 342 | /* hw dispatch queues */ |
| 343 | struct blk_mq_hw_ctx **queue_hw_ctx; |
| 344 | unsigned int nr_hw_queues; |
| 345 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 346 | /* |
Tejun Heo | 8922e16 | 2005-10-20 16:23:44 +0200 | [diff] [blame] | 347 | * Dispatch queue sorting |
| 348 | */ |
Jens Axboe | 1b47f53 | 2005-10-20 16:37:00 +0200 | [diff] [blame] | 349 | sector_t end_sector; |
Tejun Heo | 8922e16 | 2005-10-20 16:23:44 +0200 | [diff] [blame] | 350 | struct request *boundary_rq; |
Tejun Heo | 8922e16 | 2005-10-20 16:23:44 +0200 | [diff] [blame] | 351 | |
| 352 | /* |
Jens Axboe | 3cca6dc | 2011-03-02 11:08:00 -0500 | [diff] [blame] | 353 | * Delayed queue handling |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 354 | */ |
Jens Axboe | 3cca6dc | 2011-03-02 11:08:00 -0500 | [diff] [blame] | 355 | struct delayed_work delay_work; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 356 | |
| 357 | struct backing_dev_info backing_dev_info; |
| 358 | |
| 359 | /* |
| 360 | * The queue owner gets to use this for whatever they like. |
| 361 | * ll_rw_blk doesn't touch it. |
| 362 | */ |
| 363 | void *queuedata; |
| 364 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 365 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 366 | * various queue flags, see QUEUE_* below |
| 367 | */ |
| 368 | unsigned long queue_flags; |
| 369 | |
| 370 | /* |
Tejun Heo | a73f730 | 2011-12-14 00:33:37 +0100 | [diff] [blame] | 371 | * ida allocated id for this queue. Used to index queues from |
| 372 | * ioctx. |
| 373 | */ |
| 374 | int id; |
| 375 | |
| 376 | /* |
Richard Kennedy | d7b7630 | 2011-07-13 21:17:23 +0200 | [diff] [blame] | 377 | * queue needs bounce pages for pages above this limit |
| 378 | */ |
| 379 | gfp_t bounce_gfp; |
| 380 | |
| 381 | /* |
| 152587d | 2005-04-12 16:22:06 -0500 | [diff] [blame] | 382 | * protects queue structures from reentrancy. ->__queue_lock should |
| 383 | * _never_ be used directly, it is queue private. always use |
| 384 | * ->queue_lock. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 385 | */ |
| 152587d | 2005-04-12 16:22:06 -0500 | [diff] [blame] | 386 | spinlock_t __queue_lock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 387 | spinlock_t *queue_lock; |
| 388 | |
| 389 | /* |
| 390 | * queue kobject |
| 391 | */ |
| 392 | struct kobject kobj; |
| 393 | |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 394 | /* |
| 395 | * mq queue kobject |
| 396 | */ |
| 397 | struct kobject mq_kobj; |
| 398 | |
Lin Ming | 6c95466 | 2013-03-23 11:42:26 +0800 | [diff] [blame] | 399 | #ifdef CONFIG_PM_RUNTIME |
| 400 | struct device *dev; |
| 401 | int rpm_status; |
| 402 | unsigned int nr_pending; |
| 403 | #endif |
| 404 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 405 | /* |
| 406 | * queue settings |
| 407 | */ |
| 408 | unsigned long nr_requests; /* Max # of requests */ |
| 409 | unsigned int nr_congestion_on; |
| 410 | unsigned int nr_congestion_off; |
| 411 | unsigned int nr_batching; |
| 412 | |
James Bottomley | fa0ccd8 | 2008-01-10 11:30:36 -0600 | [diff] [blame] | 413 | unsigned int dma_drain_size; |
Richard Kennedy | d7b7630 | 2011-07-13 21:17:23 +0200 | [diff] [blame] | 414 | void *dma_drain_buffer; |
Tejun Heo | e3790c7 | 2008-03-04 11:18:17 +0100 | [diff] [blame] | 415 | unsigned int dma_pad_mask; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 416 | unsigned int dma_alignment; |
| 417 | |
| 418 | struct blk_queue_tag *queue_tags; |
Jens Axboe | 6eca900 | 2007-10-25 10:14:47 +0200 | [diff] [blame] | 419 | struct list_head tag_busy_list; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 420 | |
Tejun Heo | 15853af | 2005-11-10 08:52:05 +0100 | [diff] [blame] | 421 | unsigned int nr_sorted; |
Jens Axboe | 0a7ae2f | 2009-05-20 08:54:31 +0200 | [diff] [blame] | 422 | unsigned int in_flight[2]; |
Bart Van Assche | 24faf6f | 2012-11-28 13:46:45 +0100 | [diff] [blame] | 423 | /* |
| 424 | * Number of active block driver functions for which blk_drain_queue() |
| 425 | * must wait. Must be incremented around functions that unlock the |
| 426 | * queue_lock internally, e.g. scsi_request_fn(). |
| 427 | */ |
| 428 | unsigned int request_fn_active; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 429 | |
Jens Axboe | 242f9dc | 2008-09-14 05:55:09 -0700 | [diff] [blame] | 430 | unsigned int rq_timeout; |
| 431 | struct timer_list timeout; |
| 432 | struct list_head timeout_list; |
| 433 | |
Tejun Heo | a612fdd | 2011-12-14 00:33:41 +0100 | [diff] [blame] | 434 | struct list_head icq_list; |
Tejun Heo | 4eef304 | 2012-03-05 13:15:18 -0800 | [diff] [blame] | 435 | #ifdef CONFIG_BLK_CGROUP |
Tejun Heo | a2b1693 | 2012-04-13 13:11:33 -0700 | [diff] [blame] | 436 | DECLARE_BITMAP (blkcg_pols, BLKCG_MAX_POLS); |
Tejun Heo | 3c79839 | 2012-04-16 13:57:25 -0700 | [diff] [blame] | 437 | struct blkcg_gq *root_blkg; |
Tejun Heo | 03aa264 | 2012-03-05 13:15:19 -0800 | [diff] [blame] | 438 | struct list_head blkg_list; |
Tejun Heo | 4eef304 | 2012-03-05 13:15:18 -0800 | [diff] [blame] | 439 | #endif |
Tejun Heo | a612fdd | 2011-12-14 00:33:41 +0100 | [diff] [blame] | 440 | |
Martin K. Petersen | 025146e | 2009-05-22 17:17:51 -0400 | [diff] [blame] | 441 | struct queue_limits limits; |
| 442 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 443 | /* |
| 444 | * sg stuff |
| 445 | */ |
| 446 | unsigned int sg_timeout; |
| 447 | unsigned int sg_reserved_size; |
Christoph Lameter | 1946089 | 2005-06-23 00:08:19 -0700 | [diff] [blame] | 448 | int node; |
Alexey Dobriyan | 6c5c934 | 2006-09-29 01:59:40 -0700 | [diff] [blame] | 449 | #ifdef CONFIG_BLK_DEV_IO_TRACE |
Jens Axboe | 2056a78 | 2006-03-23 20:00:26 +0100 | [diff] [blame] | 450 | struct blk_trace *blk_trace; |
Alexey Dobriyan | 6c5c934 | 2006-09-29 01:59:40 -0700 | [diff] [blame] | 451 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 452 | /* |
Tejun Heo | 4913efe | 2010-09-03 11:56:16 +0200 | [diff] [blame] | 453 | * for flush operations |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 454 | */ |
Tejun Heo | 4913efe | 2010-09-03 11:56:16 +0200 | [diff] [blame] | 455 | unsigned int flush_flags; |
shaohua.li@intel.com | f387693 | 2011-05-06 11:34:32 -0600 | [diff] [blame] | 456 | unsigned int flush_not_queueable:1; |
shaohua.li@intel.com | 3ac0cc4 | 2011-05-06 11:34:41 -0600 | [diff] [blame] | 457 | unsigned int flush_queue_delayed:1; |
Tejun Heo | ae1b153 | 2011-01-25 12:43:54 +0100 | [diff] [blame] | 458 | unsigned int flush_pending_idx:1; |
| 459 | unsigned int flush_running_idx:1; |
| 460 | unsigned long flush_pending_since; |
| 461 | struct list_head flush_queue[2]; |
| 462 | struct list_head flush_data_in_flight; |
Christoph Hellwig | 1874198 | 2014-02-10 09:29:00 -0700 | [diff] [blame] | 463 | struct request *flush_rq; |
| 464 | spinlock_t mq_flush_lock; |
Al Viro | 483f4af | 2006-03-18 18:34:37 -0500 | [diff] [blame] | 465 | |
Christoph Hellwig | 6fca6a6 | 2014-05-28 08:08:02 -0600 | [diff] [blame] | 466 | struct list_head requeue_list; |
| 467 | spinlock_t requeue_lock; |
| 468 | struct work_struct requeue_work; |
| 469 | |
Al Viro | 483f4af | 2006-03-18 18:34:37 -0500 | [diff] [blame] | 470 | struct mutex sysfs_lock; |
FUJITA Tomonori | d351af0 | 2007-07-09 12:40:35 +0200 | [diff] [blame] | 471 | |
Tejun Heo | d732580 | 2012-03-05 13:14:58 -0800 | [diff] [blame] | 472 | int bypass_depth; |
| 473 | |
FUJITA Tomonori | d351af0 | 2007-07-09 12:40:35 +0200 | [diff] [blame] | 474 | #if defined(CONFIG_BLK_DEV_BSG) |
Mike Christie | aa387cc | 2011-07-31 22:05:09 +0200 | [diff] [blame] | 475 | bsg_job_fn *bsg_job_fn; |
| 476 | int bsg_job_size; |
FUJITA Tomonori | d351af0 | 2007-07-09 12:40:35 +0200 | [diff] [blame] | 477 | struct bsg_class_device bsg_dev; |
| 478 | #endif |
Vivek Goyal | e43473b | 2010-09-15 17:06:35 -0400 | [diff] [blame] | 479 | |
| 480 | #ifdef CONFIG_BLK_DEV_THROTTLING |
| 481 | /* Throttle data */ |
| 482 | struct throtl_data *td; |
| 483 | #endif |
Tejun Heo | 548bc8e | 2013-01-09 08:05:13 -0800 | [diff] [blame] | 484 | struct rcu_head rcu_head; |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 485 | wait_queue_head_t mq_freeze_wq; |
| 486 | struct percpu_counter mq_usage_counter; |
| 487 | struct list_head all_q_node; |
Jens Axboe | 0d2602c | 2014-05-13 15:10:52 -0600 | [diff] [blame] | 488 | |
| 489 | struct blk_mq_tag_set *tag_set; |
| 490 | struct list_head tag_set_list; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 491 | }; |
| 492 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 493 | #define QUEUE_FLAG_QUEUED 1 /* uses generic tag queueing */ |
| 494 | #define QUEUE_FLAG_STOPPED 2 /* queue is stopped */ |
Jens Axboe | 1faa16d | 2009-04-06 14:48:01 +0200 | [diff] [blame] | 495 | #define QUEUE_FLAG_SYNCFULL 3 /* read queue has been filled */ |
| 496 | #define QUEUE_FLAG_ASYNCFULL 4 /* write queue has been filled */ |
Bart Van Assche | 3f3299d | 2012-11-28 13:42:38 +0100 | [diff] [blame] | 497 | #define QUEUE_FLAG_DYING 5 /* queue being torn down */ |
Tejun Heo | d732580 | 2012-03-05 13:14:58 -0800 | [diff] [blame] | 498 | #define QUEUE_FLAG_BYPASS 6 /* act as dumb FIFO queue */ |
Jens Axboe | c21e6be | 2011-04-19 13:32:46 +0200 | [diff] [blame] | 499 | #define QUEUE_FLAG_BIDI 7 /* queue supports bidi requests */ |
| 500 | #define QUEUE_FLAG_NOMERGES 8 /* disable merge attempts */ |
Dan Williams | 5757a6d | 2011-07-23 20:44:25 +0200 | [diff] [blame] | 501 | #define QUEUE_FLAG_SAME_COMP 9 /* complete on same CPU-group */ |
Jens Axboe | c21e6be | 2011-04-19 13:32:46 +0200 | [diff] [blame] | 502 | #define QUEUE_FLAG_FAIL_IO 10 /* fake timeout */ |
| 503 | #define QUEUE_FLAG_STACKABLE 11 /* supports request stacking */ |
| 504 | #define QUEUE_FLAG_NONROT 12 /* non-rotational device (SSD) */ |
Fernando Luis Vázquez Cao | 88e740f | 2008-10-27 18:44:46 +0900 | [diff] [blame] | 505 | #define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */ |
Jens Axboe | c21e6be | 2011-04-19 13:32:46 +0200 | [diff] [blame] | 506 | #define QUEUE_FLAG_IO_STAT 13 /* do IO stats */ |
| 507 | #define QUEUE_FLAG_DISCARD 14 /* supports DISCARD */ |
| 508 | #define QUEUE_FLAG_NOXMERGES 15 /* No extended merges */ |
| 509 | #define QUEUE_FLAG_ADD_RANDOM 16 /* Contributes to random pool */ |
| 510 | #define QUEUE_FLAG_SECDISCARD 17 /* supports SECDISCARD */ |
Dan Williams | 5757a6d | 2011-07-23 20:44:25 +0200 | [diff] [blame] | 511 | #define QUEUE_FLAG_SAME_FORCE 18 /* force complete on same CPU */ |
Bart Van Assche | c246e80 | 2012-12-06 14:32:01 +0100 | [diff] [blame] | 512 | #define QUEUE_FLAG_DEAD 19 /* queue tear-down finished */ |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 513 | #define QUEUE_FLAG_INIT_DONE 20 /* queue is initialized */ |
Jens Axboe | 05f1dd5 | 2014-05-29 09:53:32 -0600 | [diff] [blame] | 514 | #define QUEUE_FLAG_NO_SG_MERGE 21 /* don't attempt to merge SG segments*/ |
Jens Axboe | 66cb45a | 2014-06-24 16:22:24 -0600 | [diff] [blame] | 515 | #define QUEUE_FLAG_SG_GAPS 22 /* queue doesn't support SG gaps */ |
Jens Axboe | bc58ba9 | 2009-01-23 10:54:44 +0100 | [diff] [blame] | 516 | |
| 517 | #define QUEUE_FLAG_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \ |
Jens Axboe | 01e97f6 | 2009-09-03 20:06:47 +0200 | [diff] [blame] | 518 | (1 << QUEUE_FLAG_STACKABLE) | \ |
Jens Axboe | e2e1a14 | 2010-06-09 10:42:09 +0200 | [diff] [blame] | 519 | (1 << QUEUE_FLAG_SAME_COMP) | \ |
| 520 | (1 << QUEUE_FLAG_ADD_RANDOM)) |
Tejun Heo | 797e7db | 2006-01-06 09:51:03 +0100 | [diff] [blame] | 521 | |
Jens Axboe | 94eddfb | 2013-11-19 09:25:07 -0700 | [diff] [blame] | 522 | #define QUEUE_FLAG_MQ_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \ |
| 523 | (1 << QUEUE_FLAG_SAME_COMP)) |
| 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) |
Adrian Hunter | 8d57a98 | 2010-08-11 14:17:49 -0700 | [diff] [blame] | 601 | #define blk_queue_secdiscard(q) (blk_queue_discard(q) && \ |
| 602 | test_bit(QUEUE_FLAG_SECDISCARD, &(q)->queue_flags)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 603 | |
Christoph Hellwig | 33659eb | 2010-08-07 18:17:56 +0200 | [diff] [blame] | 604 | #define blk_noretry_request(rq) \ |
| 605 | ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \ |
| 606 | REQ_FAILFAST_DRIVER)) |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 607 | |
Christoph Hellwig | 33659eb | 2010-08-07 18:17:56 +0200 | [diff] [blame] | 608 | #define blk_account_rq(rq) \ |
| 609 | (((rq)->cmd_flags & REQ_STARTED) && \ |
Martin K. Petersen | e2a60da | 2012-09-18 12:19:25 -0400 | [diff] [blame] | 610 | ((rq)->cmd_type == REQ_TYPE_FS)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 611 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 612 | #define blk_pm_request(rq) \ |
Christoph Hellwig | 33659eb | 2010-08-07 18:17:56 +0200 | [diff] [blame] | 613 | ((rq)->cmd_type == REQ_TYPE_PM_SUSPEND || \ |
| 614 | (rq)->cmd_type == REQ_TYPE_PM_RESUME) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 615 | |
Jens Axboe | ab780f1 | 2008-08-26 10:25:02 +0200 | [diff] [blame] | 616 | #define blk_rq_cpu_valid(rq) ((rq)->cpu != -1) |
FUJITA Tomonori | abae1fd | 2007-07-16 08:52:14 +0200 | [diff] [blame] | 617 | #define blk_bidi_rq(rq) ((rq)->next_rq != NULL) |
Kiyoshi Ueda | 336cdb4 | 2007-12-11 17:40:30 -0500 | [diff] [blame] | 618 | /* rq->queuelist of dequeued request must be list_empty() */ |
| 619 | #define blk_queued_rq(rq) (!list_empty(&(rq)->queuelist)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 620 | |
| 621 | #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist) |
| 622 | |
Jens Axboe | 5953316 | 2013-05-23 12:25:08 +0200 | [diff] [blame] | 623 | #define rq_data_dir(rq) (((rq)->cmd_flags & 1) != 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 624 | |
Jens Axboe | 49fd524 | 2014-04-16 10:57:18 -0600 | [diff] [blame] | 625 | /* |
| 626 | * Driver can handle struct request, if it either has an old style |
| 627 | * request_fn defined, or is blk-mq based. |
| 628 | */ |
| 629 | static inline bool queue_is_rq_based(struct request_queue *q) |
| 630 | { |
| 631 | return q->request_fn || q->mq_ops; |
| 632 | } |
| 633 | |
Martin K. Petersen | e692cb6 | 2010-12-01 19:41:49 +0100 | [diff] [blame] | 634 | static inline unsigned int blk_queue_cluster(struct request_queue *q) |
| 635 | { |
| 636 | return q->limits.cluster; |
| 637 | } |
| 638 | |
Jens Axboe | 9e2585a | 2006-07-28 09:26:13 +0200 | [diff] [blame] | 639 | /* |
Jens Axboe | 1faa16d | 2009-04-06 14:48:01 +0200 | [diff] [blame] | 640 | * 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] | 641 | */ |
Jens Axboe | 1faa16d | 2009-04-06 14:48:01 +0200 | [diff] [blame] | 642 | static inline bool rw_is_sync(unsigned int rw_flags) |
| 643 | { |
Christoph Hellwig | 7b6d91d | 2010-08-07 18:20:39 +0200 | [diff] [blame] | 644 | return !(rw_flags & REQ_WRITE) || (rw_flags & REQ_SYNC); |
Jens Axboe | 1faa16d | 2009-04-06 14:48:01 +0200 | [diff] [blame] | 645 | } |
| 646 | |
| 647 | static inline bool rq_is_sync(struct request *rq) |
| 648 | { |
| 649 | return rw_is_sync(rq->cmd_flags); |
| 650 | } |
| 651 | |
Tejun Heo | 5b788ce | 2012-06-04 20:40:59 -0700 | [diff] [blame] | 652 | static inline bool blk_rl_full(struct request_list *rl, bool sync) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 653 | { |
Tejun Heo | 5b788ce | 2012-06-04 20:40:59 -0700 | [diff] [blame] | 654 | unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL; |
| 655 | |
| 656 | return rl->flags & flag; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 657 | } |
| 658 | |
Tejun Heo | 5b788ce | 2012-06-04 20:40:59 -0700 | [diff] [blame] | 659 | 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] | 660 | { |
Tejun Heo | 5b788ce | 2012-06-04 20:40:59 -0700 | [diff] [blame] | 661 | unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL; |
| 662 | |
| 663 | rl->flags |= flag; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 664 | } |
| 665 | |
Tejun Heo | 5b788ce | 2012-06-04 20:40:59 -0700 | [diff] [blame] | 666 | 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] | 667 | { |
Tejun Heo | 5b788ce | 2012-06-04 20:40:59 -0700 | [diff] [blame] | 668 | unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL; |
| 669 | |
| 670 | rl->flags &= ~flag; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 671 | } |
| 672 | |
Martin K. Petersen | e2a60da | 2012-09-18 12:19:25 -0400 | [diff] [blame] | 673 | static inline bool rq_mergeable(struct request *rq) |
| 674 | { |
| 675 | if (rq->cmd_type != REQ_TYPE_FS) |
| 676 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | f31dc1c | 2012-09-18 12:19:26 -0400 | [diff] [blame] | 684 | static inline bool blk_check_merge_flags(unsigned int flags1, |
| 685 | unsigned int flags2) |
| 686 | { |
| 687 | if ((flags1 & REQ_DISCARD) != (flags2 & REQ_DISCARD)) |
| 688 | return false; |
| 689 | |
| 690 | if ((flags1 & REQ_SECURE) != (flags2 & REQ_SECURE)) |
| 691 | return false; |
| 692 | |
Martin K. Petersen | 4363ac7 | 2012-09-18 12:19:27 -0400 | [diff] [blame] | 693 | if ((flags1 & REQ_WRITE_SAME) != (flags2 & REQ_WRITE_SAME)) |
| 694 | return false; |
| 695 | |
Martin K. Petersen | f31dc1c | 2012-09-18 12:19:26 -0400 | [diff] [blame] | 696 | return true; |
| 697 | } |
| 698 | |
Martin K. Petersen | 4363ac7 | 2012-09-18 12:19:27 -0400 | [diff] [blame] | 699 | static inline bool blk_write_same_mergeable(struct bio *a, struct bio *b) |
| 700 | { |
| 701 | if (bio_data(a) == bio_data(b)) |
| 702 | return true; |
| 703 | |
| 704 | return false; |
| 705 | } |
| 706 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 707 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 708 | * q->prep_rq_fn return values |
| 709 | */ |
| 710 | #define BLKPREP_OK 0 /* serve it */ |
| 711 | #define BLKPREP_KILL 1 /* fatal error, kill */ |
| 712 | #define BLKPREP_DEFER 2 /* leave on queue */ |
| 713 | |
| 714 | extern unsigned long blk_max_low_pfn, blk_max_pfn; |
| 715 | |
| 716 | /* |
| 717 | * standard bounce addresses: |
| 718 | * |
| 719 | * BLK_BOUNCE_HIGH : bounce all highmem pages |
| 720 | * BLK_BOUNCE_ANY : don't bounce anything |
| 721 | * BLK_BOUNCE_ISA : bounce pages above ISA DMA boundary |
| 722 | */ |
Andi Kleen | 2472892 | 2008-04-21 09:51:05 +0200 | [diff] [blame] | 723 | |
| 724 | #if BITS_PER_LONG == 32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 725 | #define BLK_BOUNCE_HIGH ((u64)blk_max_low_pfn << PAGE_SHIFT) |
Andi Kleen | 2472892 | 2008-04-21 09:51:05 +0200 | [diff] [blame] | 726 | #else |
| 727 | #define BLK_BOUNCE_HIGH -1ULL |
| 728 | #endif |
| 729 | #define BLK_BOUNCE_ANY (-1ULL) |
FUJITA Tomonori | bfe1723 | 2010-05-31 15:59:03 +0900 | [diff] [blame] | 730 | #define BLK_BOUNCE_ISA (DMA_BIT_MASK(24)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 731 | |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 732 | /* |
| 733 | * default timeout for SG_IO if none specified |
| 734 | */ |
| 735 | #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ) |
Linus Torvalds | f2f1fa7 | 2008-12-05 14:49:18 -0800 | [diff] [blame] | 736 | #define BLK_MIN_SG_TIMEOUT (7 * HZ) |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 737 | |
Christoph Lameter | 2a7326b | 2007-07-17 04:03:37 -0700 | [diff] [blame] | 738 | #ifdef CONFIG_BOUNCE |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 739 | extern int init_emergency_isa_pool(void); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 740 | extern void blk_queue_bounce(struct request_queue *q, struct bio **bio); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 741 | #else |
| 742 | static inline int init_emergency_isa_pool(void) |
| 743 | { |
| 744 | return 0; |
| 745 | } |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 746 | 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] | 747 | { |
| 748 | } |
| 749 | #endif /* CONFIG_MMU */ |
| 750 | |
FUJITA Tomonori | 152e283 | 2008-08-28 16:17:06 +0900 | [diff] [blame] | 751 | struct rq_map_data { |
| 752 | struct page **pages; |
| 753 | int page_order; |
| 754 | int nr_entries; |
FUJITA Tomonori | 56c451f | 2008-12-18 14:49:37 +0900 | [diff] [blame] | 755 | unsigned long offset; |
FUJITA Tomonori | 97ae77a | 2008-12-18 14:49:38 +0900 | [diff] [blame] | 756 | int null_mapped; |
FUJITA Tomonori | ecb554a | 2009-07-09 14:46:53 +0200 | [diff] [blame] | 757 | int from_user; |
FUJITA Tomonori | 152e283 | 2008-08-28 16:17:06 +0900 | [diff] [blame] | 758 | }; |
| 759 | |
NeilBrown | 5705f70 | 2007-09-25 12:35:59 +0200 | [diff] [blame] | 760 | struct req_iterator { |
Kent Overstreet | 7988613 | 2013-11-23 17:19:00 -0800 | [diff] [blame] | 761 | struct bvec_iter iter; |
NeilBrown | 5705f70 | 2007-09-25 12:35:59 +0200 | [diff] [blame] | 762 | struct bio *bio; |
| 763 | }; |
| 764 | |
| 765 | /* This should not be used directly - use rq_for_each_segment */ |
Jens Axboe | 1e42807 | 2009-02-23 09:03:10 +0100 | [diff] [blame] | 766 | #define for_each_bio(_bio) \ |
| 767 | for (; _bio; _bio = _bio->bi_next) |
NeilBrown | 5705f70 | 2007-09-25 12:35:59 +0200 | [diff] [blame] | 768 | #define __rq_for_each_bio(_bio, rq) \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 769 | if ((rq->bio)) \ |
| 770 | for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next) |
| 771 | |
NeilBrown | 5705f70 | 2007-09-25 12:35:59 +0200 | [diff] [blame] | 772 | #define rq_for_each_segment(bvl, _rq, _iter) \ |
| 773 | __rq_for_each_bio(_iter.bio, _rq) \ |
Kent Overstreet | 7988613 | 2013-11-23 17:19:00 -0800 | [diff] [blame] | 774 | bio_for_each_segment(bvl, _iter.bio, _iter.iter) |
NeilBrown | 5705f70 | 2007-09-25 12:35:59 +0200 | [diff] [blame] | 775 | |
Kent Overstreet | 4550dd6 | 2013-08-07 14:26:21 -0700 | [diff] [blame] | 776 | #define rq_iter_last(bvec, _iter) \ |
Kent Overstreet | 7988613 | 2013-11-23 17:19:00 -0800 | [diff] [blame] | 777 | (_iter.bio->bi_next == NULL && \ |
Kent Overstreet | 4550dd6 | 2013-08-07 14:26:21 -0700 | [diff] [blame] | 778 | bio_iter_last(bvec, _iter.iter)) |
NeilBrown | 5705f70 | 2007-09-25 12:35:59 +0200 | [diff] [blame] | 779 | |
Ilya Loginov | 2d4dc89 | 2009-11-26 09:16:19 +0100 | [diff] [blame] | 780 | #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE |
| 781 | # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform" |
| 782 | #endif |
| 783 | #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE |
| 784 | extern void rq_flush_dcache_pages(struct request *rq); |
| 785 | #else |
| 786 | static inline void rq_flush_dcache_pages(struct request *rq) |
| 787 | { |
| 788 | } |
| 789 | #endif |
| 790 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 791 | extern int blk_register_queue(struct gendisk *disk); |
| 792 | extern void blk_unregister_queue(struct gendisk *disk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 793 | extern void generic_make_request(struct bio *bio); |
FUJITA Tomonori | 2a4aa30 | 2008-04-29 09:54:36 +0200 | [diff] [blame] | 794 | extern void blk_rq_init(struct request_queue *q, struct request *rq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 795 | extern void blk_put_request(struct request *); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 796 | extern void __blk_put_request(struct request_queue *, struct request *); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 797 | extern struct request *blk_get_request(struct request_queue *, int, gfp_t); |
Boaz Harrosh | 79eb63e | 2009-05-17 18:57:15 +0300 | [diff] [blame] | 798 | extern struct request *blk_make_request(struct request_queue *, struct bio *, |
| 799 | gfp_t); |
Jens Axboe | f27b087 | 2014-06-06 07:57:37 -0600 | [diff] [blame] | 800 | extern void blk_rq_set_block_pc(struct request *); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 801 | extern void blk_requeue_request(struct request_queue *, struct request *); |
Christoph Hellwig | 66ac028 | 2010-06-18 16:59:42 +0200 | [diff] [blame] | 802 | extern void blk_add_request_payload(struct request *rq, struct page *page, |
| 803 | unsigned int len); |
Kiyoshi Ueda | 82124d6 | 2008-09-18 10:45:38 -0400 | [diff] [blame] | 804 | extern int blk_rq_check_limits(struct request_queue *q, struct request *rq); |
Kiyoshi Ueda | ef9e3fa | 2008-10-01 16:12:15 +0200 | [diff] [blame] | 805 | extern int blk_lld_busy(struct request_queue *q); |
Kiyoshi Ueda | b0fd271 | 2009-06-11 13:10:16 +0200 | [diff] [blame] | 806 | extern int blk_rq_prep_clone(struct request *rq, struct request *rq_src, |
| 807 | struct bio_set *bs, gfp_t gfp_mask, |
| 808 | int (*bio_ctr)(struct bio *, struct bio *, void *), |
| 809 | void *data); |
| 810 | extern void blk_rq_unprep_clone(struct request *rq); |
Kiyoshi Ueda | 82124d6 | 2008-09-18 10:45:38 -0400 | [diff] [blame] | 811 | extern int blk_insert_cloned_request(struct request_queue *q, |
| 812 | struct request *rq); |
Jens Axboe | 3cca6dc | 2011-03-02 11:08:00 -0500 | [diff] [blame] | 813 | extern void blk_delay_queue(struct request_queue *, unsigned long); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 814 | extern void blk_recount_segments(struct request_queue *, struct bio *); |
Paolo Bonzini | 0bfc96c | 2012-01-12 16:01:28 +0100 | [diff] [blame] | 815 | extern int scsi_verify_blk_ioctl(struct block_device *, unsigned int); |
Paolo Bonzini | 577ebb3 | 2012-01-12 16:01:27 +0100 | [diff] [blame] | 816 | extern int scsi_cmd_blk_ioctl(struct block_device *, fmode_t, |
| 817 | unsigned int, void __user *); |
Al Viro | 74f3c8a | 2007-08-27 15:38:10 -0400 | [diff] [blame] | 818 | extern int scsi_cmd_ioctl(struct request_queue *, struct gendisk *, fmode_t, |
| 819 | unsigned int, void __user *); |
Al Viro | e915e87 | 2008-09-02 17:16:41 -0400 | [diff] [blame] | 820 | extern int sg_scsi_ioctl(struct request_queue *, struct gendisk *, fmode_t, |
| 821 | struct scsi_ioctl_command __user *); |
Andrew Morton | 3fcfab1 | 2006-10-19 23:28:16 -0700 | [diff] [blame] | 822 | |
Christoph Hellwig | 5a7bbad | 2011-09-12 12:12:01 +0200 | [diff] [blame] | 823 | extern void blk_queue_bio(struct request_queue *q, struct bio *bio); |
Christoph Hellwig | 166e1f9 | 2011-09-12 12:08:27 +0200 | [diff] [blame] | 824 | |
Andrew Morton | 3fcfab1 | 2006-10-19 23:28:16 -0700 | [diff] [blame] | 825 | /* |
| 826 | * A queue has just exitted congestion. Note this in the global counter of |
| 827 | * congested queues, and wake up anyone who was waiting for requests to be |
| 828 | * put back. |
| 829 | */ |
Jens Axboe | 8aa7e84 | 2009-07-09 14:52:32 +0200 | [diff] [blame] | 830 | static inline void blk_clear_queue_congested(struct request_queue *q, int sync) |
Andrew Morton | 3fcfab1 | 2006-10-19 23:28:16 -0700 | [diff] [blame] | 831 | { |
Jens Axboe | 8aa7e84 | 2009-07-09 14:52:32 +0200 | [diff] [blame] | 832 | clear_bdi_congested(&q->backing_dev_info, sync); |
Andrew Morton | 3fcfab1 | 2006-10-19 23:28:16 -0700 | [diff] [blame] | 833 | } |
| 834 | |
| 835 | /* |
| 836 | * A queue has just entered congestion. Flag that in the queue's VM-visible |
| 837 | * state flags and increment the global gounter of congested queues. |
| 838 | */ |
Jens Axboe | 8aa7e84 | 2009-07-09 14:52:32 +0200 | [diff] [blame] | 839 | static inline void blk_set_queue_congested(struct request_queue *q, int sync) |
Andrew Morton | 3fcfab1 | 2006-10-19 23:28:16 -0700 | [diff] [blame] | 840 | { |
Jens Axboe | 8aa7e84 | 2009-07-09 14:52:32 +0200 | [diff] [blame] | 841 | set_bdi_congested(&q->backing_dev_info, sync); |
Andrew Morton | 3fcfab1 | 2006-10-19 23:28:16 -0700 | [diff] [blame] | 842 | } |
| 843 | |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 844 | extern void blk_start_queue(struct request_queue *q); |
| 845 | extern void blk_stop_queue(struct request_queue *q); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 846 | extern void blk_sync_queue(struct request_queue *q); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 847 | extern void __blk_stop_queue(struct request_queue *q); |
Christoph Hellwig | 24ecfbe | 2011-04-18 11:41:33 +0200 | [diff] [blame] | 848 | extern void __blk_run_queue(struct request_queue *q); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 849 | extern void blk_run_queue(struct request_queue *); |
Jens Axboe | c21e6be | 2011-04-19 13:32:46 +0200 | [diff] [blame] | 850 | extern void blk_run_queue_async(struct request_queue *q); |
FUJITA Tomonori | a3bce90 | 2008-08-28 16:17:05 +0900 | [diff] [blame] | 851 | extern int blk_rq_map_user(struct request_queue *, struct request *, |
FUJITA Tomonori | 152e283 | 2008-08-28 16:17:06 +0900 | [diff] [blame] | 852 | struct rq_map_data *, void __user *, unsigned long, |
| 853 | gfp_t); |
Jens Axboe | 8e5cfc4 | 2006-12-19 11:12:46 +0100 | [diff] [blame] | 854 | extern int blk_rq_unmap_user(struct bio *); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 855 | extern int blk_rq_map_kern(struct request_queue *, struct request *, void *, unsigned int, gfp_t); |
| 856 | extern int blk_rq_map_user_iov(struct request_queue *, struct request *, |
Al Viro | 86d564c | 2014-02-08 20:42:52 -0500 | [diff] [blame] | 857 | struct rq_map_data *, const struct sg_iovec *, |
| 858 | int, unsigned int, gfp_t); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 859 | extern int blk_execute_rq(struct request_queue *, struct gendisk *, |
James Bottomley | 994ca9a | 2005-06-20 14:11:09 +0200 | [diff] [blame] | 860 | struct request *, int); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 861 | extern void blk_execute_rq_nowait(struct request_queue *, struct gendisk *, |
Jens Axboe | 15fc858 | 2006-01-06 10:00:50 +0100 | [diff] [blame] | 862 | struct request *, int, rq_end_io_fn *); |
Mike Christie | 6e39b69e | 2005-11-11 05:30:24 -0600 | [diff] [blame] | 863 | |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 864 | static inline struct request_queue *bdev_get_queue(struct block_device *bdev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 865 | { |
| 866 | return bdev->bd_disk->queue; |
| 867 | } |
| 868 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 869 | /* |
Tejun Heo | 80a761f | 2009-07-03 17:48:17 +0900 | [diff] [blame] | 870 | * blk_rq_pos() : the current sector |
| 871 | * blk_rq_bytes() : bytes left in the entire request |
| 872 | * blk_rq_cur_bytes() : bytes left in the current segment |
| 873 | * blk_rq_err_bytes() : bytes left till the next error boundary |
| 874 | * blk_rq_sectors() : sectors left in the entire request |
| 875 | * blk_rq_cur_sectors() : sectors left in the current segment |
Tejun Heo | 5efccd1 | 2009-04-23 11:05:18 +0900 | [diff] [blame] | 876 | */ |
Tejun Heo | 5b93629 | 2009-05-07 22:24:38 +0900 | [diff] [blame] | 877 | static inline sector_t blk_rq_pos(const struct request *rq) |
| 878 | { |
Tejun Heo | a2dec7b | 2009-05-07 22:24:44 +0900 | [diff] [blame] | 879 | return rq->__sector; |
Tejun Heo | 5b93629 | 2009-05-07 22:24:38 +0900 | [diff] [blame] | 880 | } |
| 881 | |
Tejun Heo | 2e46e8b | 2009-05-07 22:24:41 +0900 | [diff] [blame] | 882 | static inline unsigned int blk_rq_bytes(const struct request *rq) |
| 883 | { |
Tejun Heo | a2dec7b | 2009-05-07 22:24:44 +0900 | [diff] [blame] | 884 | return rq->__data_len; |
Tejun Heo | 2e46e8b | 2009-05-07 22:24:41 +0900 | [diff] [blame] | 885 | } |
| 886 | |
| 887 | static inline int blk_rq_cur_bytes(const struct request *rq) |
| 888 | { |
| 889 | return rq->bio ? bio_cur_bytes(rq->bio) : 0; |
| 890 | } |
Tejun Heo | 5efccd1 | 2009-04-23 11:05:18 +0900 | [diff] [blame] | 891 | |
Tejun Heo | 80a761f | 2009-07-03 17:48:17 +0900 | [diff] [blame] | 892 | extern unsigned int blk_rq_err_bytes(const struct request *rq); |
| 893 | |
Tejun Heo | 5b93629 | 2009-05-07 22:24:38 +0900 | [diff] [blame] | 894 | static inline unsigned int blk_rq_sectors(const struct request *rq) |
| 895 | { |
Tejun Heo | 2e46e8b | 2009-05-07 22:24:41 +0900 | [diff] [blame] | 896 | return blk_rq_bytes(rq) >> 9; |
Tejun Heo | 5b93629 | 2009-05-07 22:24:38 +0900 | [diff] [blame] | 897 | } |
| 898 | |
| 899 | static inline unsigned int blk_rq_cur_sectors(const struct request *rq) |
| 900 | { |
Tejun Heo | 2e46e8b | 2009-05-07 22:24:41 +0900 | [diff] [blame] | 901 | return blk_rq_cur_bytes(rq) >> 9; |
Tejun Heo | 5b93629 | 2009-05-07 22:24:38 +0900 | [diff] [blame] | 902 | } |
| 903 | |
Martin K. Petersen | f31dc1c | 2012-09-18 12:19:26 -0400 | [diff] [blame] | 904 | static inline unsigned int blk_queue_get_max_sectors(struct request_queue *q, |
| 905 | unsigned int cmd_flags) |
| 906 | { |
| 907 | if (unlikely(cmd_flags & REQ_DISCARD)) |
James Bottomley | 871dd92 | 2013-04-24 08:52:50 -0600 | [diff] [blame] | 908 | return min(q->limits.max_discard_sectors, UINT_MAX >> 9); |
Martin K. Petersen | f31dc1c | 2012-09-18 12:19:26 -0400 | [diff] [blame] | 909 | |
Martin K. Petersen | 4363ac7 | 2012-09-18 12:19:27 -0400 | [diff] [blame] | 910 | if (unlikely(cmd_flags & REQ_WRITE_SAME)) |
| 911 | return q->limits.max_write_same_sectors; |
| 912 | |
Martin K. Petersen | f31dc1c | 2012-09-18 12:19:26 -0400 | [diff] [blame] | 913 | return q->limits.max_sectors; |
| 914 | } |
| 915 | |
Jens Axboe | 762380a | 2014-06-05 13:38:39 -0600 | [diff] [blame] | 916 | /* |
| 917 | * Return maximum size of a request at given offset. Only valid for |
| 918 | * file system requests. |
| 919 | */ |
| 920 | static inline unsigned int blk_max_size_offset(struct request_queue *q, |
| 921 | sector_t offset) |
| 922 | { |
| 923 | if (!q->limits.chunk_sectors) |
Jens Axboe | 736ed4d | 2014-06-17 22:09:29 -0700 | [diff] [blame] | 924 | return q->limits.max_sectors; |
Jens Axboe | 762380a | 2014-06-05 13:38:39 -0600 | [diff] [blame] | 925 | |
| 926 | return q->limits.chunk_sectors - |
| 927 | (offset & (q->limits.chunk_sectors - 1)); |
| 928 | } |
| 929 | |
Martin K. Petersen | f31dc1c | 2012-09-18 12:19:26 -0400 | [diff] [blame] | 930 | static inline unsigned int blk_rq_get_max_sectors(struct request *rq) |
| 931 | { |
| 932 | struct request_queue *q = rq->q; |
| 933 | |
| 934 | if (unlikely(rq->cmd_type == REQ_TYPE_BLOCK_PC)) |
| 935 | return q->limits.max_hw_sectors; |
| 936 | |
Jens Axboe | 762380a | 2014-06-05 13:38:39 -0600 | [diff] [blame] | 937 | if (!q->limits.chunk_sectors) |
| 938 | return blk_queue_get_max_sectors(q, rq->cmd_flags); |
| 939 | |
| 940 | return min(blk_max_size_offset(q, blk_rq_pos(rq)), |
| 941 | blk_queue_get_max_sectors(q, rq->cmd_flags)); |
Martin K. Petersen | f31dc1c | 2012-09-18 12:19:26 -0400 | [diff] [blame] | 942 | } |
| 943 | |
Jun'ichi Nomura | 75afb35 | 2013-09-21 13:57:47 -0600 | [diff] [blame] | 944 | static inline unsigned int blk_rq_count_bios(struct request *rq) |
| 945 | { |
| 946 | unsigned int nr_bios = 0; |
| 947 | struct bio *bio; |
| 948 | |
| 949 | __rq_for_each_bio(bio, rq) |
| 950 | nr_bios++; |
| 951 | |
| 952 | return nr_bios; |
| 953 | } |
| 954 | |
Tejun Heo | 5efccd1 | 2009-04-23 11:05:18 +0900 | [diff] [blame] | 955 | /* |
Tejun Heo | 9934c8c | 2009-05-08 11:54:16 +0900 | [diff] [blame] | 956 | * Request issue related functions. |
| 957 | */ |
| 958 | extern struct request *blk_peek_request(struct request_queue *q); |
| 959 | extern void blk_start_request(struct request *rq); |
| 960 | extern struct request *blk_fetch_request(struct request_queue *q); |
| 961 | |
| 962 | /* |
Tejun Heo | 2e60e02 | 2009-04-23 11:05:18 +0900 | [diff] [blame] | 963 | * Request completion related functions. |
| 964 | * |
| 965 | * blk_update_request() completes given number of bytes and updates |
| 966 | * the request without completing it. |
| 967 | * |
Tejun Heo | f06d9a2 | 2009-04-23 11:05:19 +0900 | [diff] [blame] | 968 | * blk_end_request() and friends. __blk_end_request() must be called |
| 969 | * with the request queue spinlock acquired. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 970 | * |
| 971 | * Several drivers define their own end_request and call |
Kiyoshi Ueda | 3bcddea | 2007-12-11 17:52:28 -0500 | [diff] [blame] | 972 | * blk_end_request() for parts of the original function. |
| 973 | * This prevents code duplication in drivers. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 974 | */ |
Tejun Heo | 2e60e02 | 2009-04-23 11:05:18 +0900 | [diff] [blame] | 975 | extern bool blk_update_request(struct request *rq, int error, |
| 976 | unsigned int nr_bytes); |
Christoph Hellwig | 1212007 | 2014-04-16 09:44:59 +0200 | [diff] [blame] | 977 | extern void blk_finish_request(struct request *rq, int error); |
FUJITA Tomonori | b1f7449 | 2009-05-11 17:56:09 +0900 | [diff] [blame] | 978 | extern bool blk_end_request(struct request *rq, int error, |
| 979 | unsigned int nr_bytes); |
| 980 | extern void blk_end_request_all(struct request *rq, int error); |
| 981 | extern bool blk_end_request_cur(struct request *rq, int error); |
Tejun Heo | 80a761f | 2009-07-03 17:48:17 +0900 | [diff] [blame] | 982 | extern bool blk_end_request_err(struct request *rq, int error); |
FUJITA Tomonori | b1f7449 | 2009-05-11 17:56:09 +0900 | [diff] [blame] | 983 | extern bool __blk_end_request(struct request *rq, int error, |
| 984 | unsigned int nr_bytes); |
| 985 | extern void __blk_end_request_all(struct request *rq, int error); |
| 986 | extern bool __blk_end_request_cur(struct request *rq, int error); |
Tejun Heo | 80a761f | 2009-07-03 17:48:17 +0900 | [diff] [blame] | 987 | extern bool __blk_end_request_err(struct request *rq, int error); |
Tejun Heo | 2e60e02 | 2009-04-23 11:05:18 +0900 | [diff] [blame] | 988 | |
Jens Axboe | ff856ba | 2006-01-09 16:02:34 +0100 | [diff] [blame] | 989 | extern void blk_complete_request(struct request *); |
Jens Axboe | 242f9dc | 2008-09-14 05:55:09 -0700 | [diff] [blame] | 990 | extern void __blk_complete_request(struct request *); |
| 991 | extern void blk_abort_request(struct request *); |
James Bottomley | 28018c2 | 2010-07-01 19:49:17 +0900 | [diff] [blame] | 992 | extern void blk_unprep_request(struct request *); |
Jens Axboe | ff856ba | 2006-01-09 16:02:34 +0100 | [diff] [blame] | 993 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 994 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 995 | * Access functions for manipulating queue properties |
| 996 | */ |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 997 | extern struct request_queue *blk_init_queue_node(request_fn_proc *rfn, |
Christoph Lameter | 1946089 | 2005-06-23 00:08:19 -0700 | [diff] [blame] | 998 | spinlock_t *lock, int node_id); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 999 | extern struct request_queue *blk_init_queue(request_fn_proc *, spinlock_t *); |
Mike Snitzer | 01effb0 | 2010-05-11 08:57:42 +0200 | [diff] [blame] | 1000 | extern struct request_queue *blk_init_allocated_queue(struct request_queue *, |
| 1001 | request_fn_proc *, spinlock_t *); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 1002 | extern void blk_cleanup_queue(struct request_queue *); |
| 1003 | extern void blk_queue_make_request(struct request_queue *, make_request_fn *); |
| 1004 | extern void blk_queue_bounce_limit(struct request_queue *, u64); |
Mike Snitzer | 72d4cd9 | 2010-12-17 08:34:20 +0100 | [diff] [blame] | 1005 | extern void blk_limits_max_hw_sectors(struct queue_limits *, unsigned int); |
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); |
Martin K. Petersen | e1defc4 | 2009-05-22 17:17:49 -0400 | [diff] [blame] | 1014 | extern void blk_queue_logical_block_size(struct request_queue *, unsigned short); |
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); |
| 1038 | 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] | 1039 | 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] | 1040 | extern void blk_queue_merge_bvec(struct request_queue *, merge_bvec_fn *); |
| 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); |
Tejun Heo | 4913efe | 2010-09-03 11:56:16 +0200 | [diff] [blame] | 1046 | extern void blk_queue_flush(struct request_queue *q, unsigned int flush); |
shaohua.li@intel.com | f387693 | 2011-05-06 11:34:32 -0600 | [diff] [blame] | 1047 | extern void blk_queue_flush_queueable(struct request_queue *q, bool queueable); |
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 *); |
Asias He | 85b9f66 | 2012-08-02 23:42:04 +0200 | [diff] [blame] | 1051 | extern int blk_bio_map_sg(struct request_queue *q, struct bio *bio, |
| 1052 | struct scatterlist *sglist); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1053 | extern void blk_dump_rq_flags(struct request *, char *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1054 | extern long nr_blockdev_pages(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1055 | |
Tejun Heo | 09ac46c | 2011-12-14 00:33:38 +0100 | [diff] [blame] | 1056 | bool __must_check blk_get_queue(struct request_queue *); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 1057 | struct request_queue *blk_alloc_queue(gfp_t); |
| 1058 | struct request_queue *blk_alloc_queue_node(gfp_t, int); |
| 1059 | extern void blk_put_queue(struct request_queue *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1060 | |
Shaohua Li | 316cc67 | 2011-07-08 08:19:21 +0200 | [diff] [blame] | 1061 | /* |
Lin Ming | 6c95466 | 2013-03-23 11:42:26 +0800 | [diff] [blame] | 1062 | * block layer runtime pm functions |
| 1063 | */ |
| 1064 | #ifdef CONFIG_PM_RUNTIME |
| 1065 | extern void blk_pm_runtime_init(struct request_queue *q, struct device *dev); |
| 1066 | extern int blk_pre_runtime_suspend(struct request_queue *q); |
| 1067 | extern void blk_post_runtime_suspend(struct request_queue *q, int err); |
| 1068 | extern void blk_pre_runtime_resume(struct request_queue *q); |
| 1069 | extern void blk_post_runtime_resume(struct request_queue *q, int err); |
| 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) {} |
| 1080 | #endif |
| 1081 | |
| 1082 | /* |
Suresh Jayaraman | 75df713 | 2011-09-21 10:00:16 +0200 | [diff] [blame] | 1083 | * blk_plug permits building a queue of related requests by holding the I/O |
| 1084 | * fragments for a short period. This allows merging of sequential requests |
| 1085 | * into single larger request. As the requests are moved from a per-task list to |
| 1086 | * the device's request_queue in a batch, this results in improved scalability |
| 1087 | * as the lock contention for request_queue lock is reduced. |
| 1088 | * |
| 1089 | * It is ok not to disable preemption when adding the request to the plug list |
| 1090 | * or when attempting a merge, because blk_schedule_flush_list() will only flush |
| 1091 | * the plug list when the task sleeps by itself. For details, please see |
| 1092 | * schedule() where blk_schedule_flush_plug() is called. |
Shaohua Li | 316cc67 | 2011-07-08 08:19:21 +0200 | [diff] [blame] | 1093 | */ |
Jens Axboe | 73c1010 | 2011-03-08 13:19:51 +0100 | [diff] [blame] | 1094 | struct blk_plug { |
Suresh Jayaraman | 75df713 | 2011-09-21 10:00:16 +0200 | [diff] [blame] | 1095 | struct list_head list; /* requests */ |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1096 | struct list_head mq_list; /* blk-mq requests */ |
Suresh Jayaraman | 75df713 | 2011-09-21 10:00:16 +0200 | [diff] [blame] | 1097 | struct list_head cb_list; /* md requires an unplug callback */ |
Jens Axboe | 73c1010 | 2011-03-08 13:19:51 +0100 | [diff] [blame] | 1098 | }; |
Shaohua Li | 55c022b | 2011-07-08 08:19:20 +0200 | [diff] [blame] | 1099 | #define BLK_MAX_REQUEST_COUNT 16 |
| 1100 | |
NeilBrown | 9cbb175 | 2012-07-31 09:08:14 +0200 | [diff] [blame] | 1101 | struct blk_plug_cb; |
NeilBrown | 74018dc | 2012-07-31 09:08:15 +0200 | [diff] [blame] | 1102 | typedef void (*blk_plug_cb_fn)(struct blk_plug_cb *, bool); |
NeilBrown | 048c937 | 2011-04-18 09:52:22 +0200 | [diff] [blame] | 1103 | struct blk_plug_cb { |
| 1104 | struct list_head list; |
NeilBrown | 9cbb175 | 2012-07-31 09:08:14 +0200 | [diff] [blame] | 1105 | blk_plug_cb_fn callback; |
| 1106 | void *data; |
NeilBrown | 048c937 | 2011-04-18 09:52:22 +0200 | [diff] [blame] | 1107 | }; |
NeilBrown | 9cbb175 | 2012-07-31 09:08:14 +0200 | [diff] [blame] | 1108 | extern struct blk_plug_cb *blk_check_plugged(blk_plug_cb_fn unplug, |
| 1109 | void *data, int size); |
Jens Axboe | 73c1010 | 2011-03-08 13:19:51 +0100 | [diff] [blame] | 1110 | extern void blk_start_plug(struct blk_plug *); |
| 1111 | extern void blk_finish_plug(struct blk_plug *); |
Jens Axboe | f660378 | 2011-04-15 15:49:07 +0200 | [diff] [blame] | 1112 | extern void blk_flush_plug_list(struct blk_plug *, bool); |
Jens Axboe | 73c1010 | 2011-03-08 13:19:51 +0100 | [diff] [blame] | 1113 | |
| 1114 | static inline void blk_flush_plug(struct task_struct *tsk) |
| 1115 | { |
| 1116 | struct blk_plug *plug = tsk->plug; |
| 1117 | |
Christoph Hellwig | 88b996c | 2011-04-15 15:20:10 +0200 | [diff] [blame] | 1118 | if (plug) |
Jens Axboe | a237c1c | 2011-04-16 13:27:55 +0200 | [diff] [blame] | 1119 | blk_flush_plug_list(plug, false); |
| 1120 | } |
| 1121 | |
| 1122 | static inline void blk_schedule_flush_plug(struct task_struct *tsk) |
| 1123 | { |
| 1124 | struct blk_plug *plug = tsk->plug; |
| 1125 | |
| 1126 | if (plug) |
Jens Axboe | f660378 | 2011-04-15 15:49:07 +0200 | [diff] [blame] | 1127 | blk_flush_plug_list(plug, true); |
Jens Axboe | 73c1010 | 2011-03-08 13:19:51 +0100 | [diff] [blame] | 1128 | } |
| 1129 | |
| 1130 | static inline bool blk_needs_flush_plug(struct task_struct *tsk) |
| 1131 | { |
| 1132 | struct blk_plug *plug = tsk->plug; |
| 1133 | |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1134 | return plug && |
| 1135 | (!list_empty(&plug->list) || |
| 1136 | !list_empty(&plug->mq_list) || |
| 1137 | !list_empty(&plug->cb_list)); |
Jens Axboe | 73c1010 | 2011-03-08 13:19:51 +0100 | [diff] [blame] | 1138 | } |
| 1139 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1140 | /* |
| 1141 | * tag stuff |
| 1142 | */ |
Christoph Hellwig | fb3ccb5 | 2014-04-14 10:30:12 +0200 | [diff] [blame] | 1143 | #define blk_rq_tagged(rq) \ |
| 1144 | ((rq)->mq_ctx || ((rq)->cmd_flags & REQ_QUEUED)) |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 1145 | extern int blk_queue_start_tag(struct request_queue *, struct request *); |
| 1146 | extern struct request *blk_queue_find_tag(struct request_queue *, int); |
| 1147 | extern void blk_queue_end_tag(struct request_queue *, struct request *); |
| 1148 | extern int blk_queue_init_tags(struct request_queue *, int, struct blk_queue_tag *); |
| 1149 | extern void blk_queue_free_tags(struct request_queue *); |
| 1150 | extern int blk_queue_resize_tags(struct request_queue *, int); |
| 1151 | extern void blk_queue_invalidate_tags(struct request_queue *); |
James Bottomley | 492dfb4 | 2006-08-30 15:48:45 -0400 | [diff] [blame] | 1152 | extern struct blk_queue_tag *blk_init_tags(int); |
| 1153 | extern void blk_free_tags(struct blk_queue_tag *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1154 | |
David C Somayajulu | f583f49 | 2006-10-04 08:27:25 +0200 | [diff] [blame] | 1155 | static inline struct request *blk_map_queue_find_tag(struct blk_queue_tag *bqt, |
| 1156 | int tag) |
| 1157 | { |
| 1158 | if (unlikely(bqt == NULL || tag >= bqt->real_max_depth)) |
| 1159 | return NULL; |
| 1160 | return bqt->tag_index[tag]; |
| 1161 | } |
Christoph Hellwig | dd3932e | 2010-09-16 20:51:46 +0200 | [diff] [blame] | 1162 | |
| 1163 | #define BLKDEV_DISCARD_SECURE 0x01 /* secure discard */ |
| 1164 | |
| 1165 | extern int blkdev_issue_flush(struct block_device *, gfp_t, sector_t *); |
Dmitry Monakhov | fbd9b09 | 2010-04-28 17:55:06 +0400 | [diff] [blame] | 1166 | extern int blkdev_issue_discard(struct block_device *bdev, sector_t sector, |
| 1167 | sector_t nr_sects, gfp_t gfp_mask, unsigned long flags); |
Martin K. Petersen | 4363ac7 | 2012-09-18 12:19:27 -0400 | [diff] [blame] | 1168 | extern int blkdev_issue_write_same(struct block_device *bdev, sector_t sector, |
| 1169 | sector_t nr_sects, gfp_t gfp_mask, struct page *page); |
Dmitry Monakhov | 3f14d79 | 2010-04-28 17:55:09 +0400 | [diff] [blame] | 1170 | extern int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, |
Christoph Hellwig | dd3932e | 2010-09-16 20:51:46 +0200 | [diff] [blame] | 1171 | sector_t nr_sects, gfp_t gfp_mask); |
Christoph Hellwig | 2cf6d26 | 2010-08-18 05:29:10 -0400 | [diff] [blame] | 1172 | static inline int sb_issue_discard(struct super_block *sb, sector_t block, |
| 1173 | sector_t nr_blocks, gfp_t gfp_mask, unsigned long flags) |
David Woodhouse | fb2dce8 | 2008-08-05 18:01:53 +0100 | [diff] [blame] | 1174 | { |
Christoph Hellwig | 2cf6d26 | 2010-08-18 05:29:10 -0400 | [diff] [blame] | 1175 | return blkdev_issue_discard(sb->s_bdev, block << (sb->s_blocksize_bits - 9), |
| 1176 | nr_blocks << (sb->s_blocksize_bits - 9), |
| 1177 | gfp_mask, flags); |
David Woodhouse | fb2dce8 | 2008-08-05 18:01:53 +0100 | [diff] [blame] | 1178 | } |
Lukas Czerner | e6fa0be | 2010-10-27 21:30:04 -0400 | [diff] [blame] | 1179 | 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] | 1180 | sector_t nr_blocks, gfp_t gfp_mask) |
Lukas Czerner | e6fa0be | 2010-10-27 21:30:04 -0400 | [diff] [blame] | 1181 | { |
| 1182 | return blkdev_issue_zeroout(sb->s_bdev, |
| 1183 | block << (sb->s_blocksize_bits - 9), |
| 1184 | nr_blocks << (sb->s_blocksize_bits - 9), |
Theodore Ts'o | a107e5a | 2010-10-27 23:44:47 -0400 | [diff] [blame] | 1185 | gfp_mask); |
Lukas Czerner | e6fa0be | 2010-10-27 21:30:04 -0400 | [diff] [blame] | 1186 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1187 | |
Jens Axboe | 018e044 | 2009-06-26 16:27:10 +0200 | [diff] [blame] | 1188 | 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] | 1189 | |
Martin K. Petersen | eb28d31 | 2010-02-26 00:20:37 -0500 | [diff] [blame] | 1190 | enum blk_default_limits { |
| 1191 | BLK_MAX_SEGMENTS = 128, |
| 1192 | BLK_SAFE_MAX_SECTORS = 255, |
| 1193 | BLK_DEF_MAX_SECTORS = 1024, |
| 1194 | BLK_MAX_SEGMENT_SIZE = 65536, |
| 1195 | BLK_SEG_BOUNDARY_MASK = 0xFFFFFFFFUL, |
| 1196 | }; |
Milan Broz | 0e435ac | 2008-12-03 12:55:08 +0100 | [diff] [blame] | 1197 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1198 | #define blkdev_entry_to_request(entry) list_entry((entry), struct request, queuelist) |
| 1199 | |
Martin K. Petersen | ae03bf6 | 2009-05-22 17:17:50 -0400 | [diff] [blame] | 1200 | static inline unsigned long queue_bounce_pfn(struct request_queue *q) |
| 1201 | { |
Martin K. Petersen | 025146e | 2009-05-22 17:17:51 -0400 | [diff] [blame] | 1202 | return q->limits.bounce_pfn; |
Martin K. Petersen | ae03bf6 | 2009-05-22 17:17:50 -0400 | [diff] [blame] | 1203 | } |
| 1204 | |
| 1205 | static inline unsigned long queue_segment_boundary(struct request_queue *q) |
| 1206 | { |
Martin K. Petersen | 025146e | 2009-05-22 17:17:51 -0400 | [diff] [blame] | 1207 | return q->limits.seg_boundary_mask; |
Martin K. Petersen | ae03bf6 | 2009-05-22 17:17:50 -0400 | [diff] [blame] | 1208 | } |
| 1209 | |
| 1210 | static inline unsigned int queue_max_sectors(struct request_queue *q) |
| 1211 | { |
Martin K. Petersen | 025146e | 2009-05-22 17:17:51 -0400 | [diff] [blame] | 1212 | return q->limits.max_sectors; |
Martin K. Petersen | ae03bf6 | 2009-05-22 17:17:50 -0400 | [diff] [blame] | 1213 | } |
| 1214 | |
| 1215 | static inline unsigned int queue_max_hw_sectors(struct request_queue *q) |
| 1216 | { |
Martin K. Petersen | 025146e | 2009-05-22 17:17:51 -0400 | [diff] [blame] | 1217 | return q->limits.max_hw_sectors; |
Martin K. Petersen | ae03bf6 | 2009-05-22 17:17:50 -0400 | [diff] [blame] | 1218 | } |
| 1219 | |
Martin K. Petersen | 8a78362 | 2010-02-26 00:20:39 -0500 | [diff] [blame] | 1220 | static inline unsigned short queue_max_segments(struct request_queue *q) |
Martin K. Petersen | ae03bf6 | 2009-05-22 17:17:50 -0400 | [diff] [blame] | 1221 | { |
Martin K. Petersen | 8a78362 | 2010-02-26 00:20:39 -0500 | [diff] [blame] | 1222 | return q->limits.max_segments; |
Martin K. Petersen | ae03bf6 | 2009-05-22 17:17:50 -0400 | [diff] [blame] | 1223 | } |
| 1224 | |
| 1225 | static inline unsigned int queue_max_segment_size(struct request_queue *q) |
| 1226 | { |
Martin K. Petersen | 025146e | 2009-05-22 17:17:51 -0400 | [diff] [blame] | 1227 | return q->limits.max_segment_size; |
Martin K. Petersen | ae03bf6 | 2009-05-22 17:17:50 -0400 | [diff] [blame] | 1228 | } |
| 1229 | |
Martin K. Petersen | e1defc4 | 2009-05-22 17:17:49 -0400 | [diff] [blame] | 1230 | static inline unsigned short queue_logical_block_size(struct request_queue *q) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1231 | { |
| 1232 | int retval = 512; |
| 1233 | |
Martin K. Petersen | 025146e | 2009-05-22 17:17:51 -0400 | [diff] [blame] | 1234 | if (q && q->limits.logical_block_size) |
| 1235 | retval = q->limits.logical_block_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1236 | |
| 1237 | return retval; |
| 1238 | } |
| 1239 | |
Martin K. Petersen | e1defc4 | 2009-05-22 17:17:49 -0400 | [diff] [blame] | 1240 | static inline unsigned short bdev_logical_block_size(struct block_device *bdev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1241 | { |
Martin K. Petersen | e1defc4 | 2009-05-22 17:17:49 -0400 | [diff] [blame] | 1242 | return queue_logical_block_size(bdev_get_queue(bdev)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1243 | } |
| 1244 | |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 1245 | static inline unsigned int queue_physical_block_size(struct request_queue *q) |
| 1246 | { |
| 1247 | return q->limits.physical_block_size; |
| 1248 | } |
| 1249 | |
Martin K. Petersen | 892b6f9 | 2010-10-13 21:18:03 +0200 | [diff] [blame] | 1250 | 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] | 1251 | { |
| 1252 | return queue_physical_block_size(bdev_get_queue(bdev)); |
| 1253 | } |
| 1254 | |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 1255 | static inline unsigned int queue_io_min(struct request_queue *q) |
| 1256 | { |
| 1257 | return q->limits.io_min; |
| 1258 | } |
| 1259 | |
Martin K. Petersen | ac481c2 | 2009-10-03 20:52:01 +0200 | [diff] [blame] | 1260 | static inline int bdev_io_min(struct block_device *bdev) |
| 1261 | { |
| 1262 | return queue_io_min(bdev_get_queue(bdev)); |
| 1263 | } |
| 1264 | |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 1265 | static inline unsigned int queue_io_opt(struct request_queue *q) |
| 1266 | { |
| 1267 | return q->limits.io_opt; |
| 1268 | } |
| 1269 | |
Martin K. Petersen | ac481c2 | 2009-10-03 20:52:01 +0200 | [diff] [blame] | 1270 | static inline int bdev_io_opt(struct block_device *bdev) |
| 1271 | { |
| 1272 | return queue_io_opt(bdev_get_queue(bdev)); |
| 1273 | } |
| 1274 | |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 1275 | static inline int queue_alignment_offset(struct request_queue *q) |
| 1276 | { |
Martin K. Petersen | ac481c2 | 2009-10-03 20:52:01 +0200 | [diff] [blame] | 1277 | if (q->limits.misaligned) |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 1278 | return -1; |
| 1279 | |
Martin K. Petersen | ac481c2 | 2009-10-03 20:52:01 +0200 | [diff] [blame] | 1280 | return q->limits.alignment_offset; |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 1281 | } |
| 1282 | |
Martin K. Petersen | e03a72e | 2010-01-11 03:21:51 -0500 | [diff] [blame] | 1283 | 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] | 1284 | { |
| 1285 | unsigned int granularity = max(lim->physical_block_size, lim->io_min); |
Martin K. Petersen | e03a72e | 2010-01-11 03:21:51 -0500 | [diff] [blame] | 1286 | unsigned int alignment = (sector << 9) & (granularity - 1); |
Martin K. Petersen | 81744ee | 2009-12-29 08:35:35 +0100 | [diff] [blame] | 1287 | |
Martin K. Petersen | e03a72e | 2010-01-11 03:21:51 -0500 | [diff] [blame] | 1288 | return (granularity + lim->alignment_offset - alignment) |
| 1289 | & (granularity - 1); |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 1290 | } |
| 1291 | |
Martin K. Petersen | ac481c2 | 2009-10-03 20:52:01 +0200 | [diff] [blame] | 1292 | static inline int bdev_alignment_offset(struct block_device *bdev) |
| 1293 | { |
| 1294 | struct request_queue *q = bdev_get_queue(bdev); |
| 1295 | |
| 1296 | if (q->limits.misaligned) |
| 1297 | return -1; |
| 1298 | |
| 1299 | if (bdev != bdev->bd_contains) |
| 1300 | return bdev->bd_part->alignment_offset; |
| 1301 | |
| 1302 | return q->limits.alignment_offset; |
| 1303 | } |
| 1304 | |
Martin K. Petersen | 86b3728 | 2009-11-10 11:50:21 +0100 | [diff] [blame] | 1305 | static inline int queue_discard_alignment(struct request_queue *q) |
| 1306 | { |
| 1307 | if (q->limits.discard_misaligned) |
| 1308 | return -1; |
| 1309 | |
| 1310 | return q->limits.discard_alignment; |
| 1311 | } |
| 1312 | |
Martin K. Petersen | e03a72e | 2010-01-11 03:21:51 -0500 | [diff] [blame] | 1313 | 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] | 1314 | { |
Linus Torvalds | 5977107 | 2012-12-19 07:18:35 -0800 | [diff] [blame] | 1315 | unsigned int alignment, granularity, offset; |
Martin K. Petersen | dd3d145 | 2010-01-11 03:21:48 -0500 | [diff] [blame] | 1316 | |
Martin K. Petersen | a934a00 | 2011-05-18 10:37:35 +0200 | [diff] [blame] | 1317 | if (!lim->max_discard_sectors) |
| 1318 | return 0; |
| 1319 | |
Linus Torvalds | 5977107 | 2012-12-19 07:18:35 -0800 | [diff] [blame] | 1320 | /* Why are these in bytes, not sectors? */ |
| 1321 | alignment = lim->discard_alignment >> 9; |
| 1322 | granularity = lim->discard_granularity >> 9; |
| 1323 | if (!granularity) |
| 1324 | return 0; |
| 1325 | |
| 1326 | /* Offset of the partition start in 'granularity' sectors */ |
| 1327 | offset = sector_div(sector, granularity); |
| 1328 | |
| 1329 | /* And why do we do this modulus *again* in blkdev_issue_discard()? */ |
| 1330 | offset = (granularity + alignment - offset) % granularity; |
| 1331 | |
| 1332 | /* Turn it back into bytes, gaah */ |
| 1333 | return offset << 9; |
Martin K. Petersen | 86b3728 | 2009-11-10 11:50:21 +0100 | [diff] [blame] | 1334 | } |
| 1335 | |
Paolo Bonzini | c6e6663 | 2012-08-02 09:48:50 +0200 | [diff] [blame] | 1336 | static inline int bdev_discard_alignment(struct block_device *bdev) |
| 1337 | { |
| 1338 | struct request_queue *q = bdev_get_queue(bdev); |
| 1339 | |
| 1340 | if (bdev != bdev->bd_contains) |
| 1341 | return bdev->bd_part->discard_alignment; |
| 1342 | |
| 1343 | return q->limits.discard_alignment; |
| 1344 | } |
| 1345 | |
Martin K. Petersen | 98262f2 | 2009-12-03 09:24:48 +0100 | [diff] [blame] | 1346 | static inline unsigned int queue_discard_zeroes_data(struct request_queue *q) |
| 1347 | { |
Martin K. Petersen | a934a00 | 2011-05-18 10:37:35 +0200 | [diff] [blame] | 1348 | 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] | 1349 | return 1; |
| 1350 | |
| 1351 | return 0; |
| 1352 | } |
| 1353 | |
| 1354 | static inline unsigned int bdev_discard_zeroes_data(struct block_device *bdev) |
| 1355 | { |
| 1356 | return queue_discard_zeroes_data(bdev_get_queue(bdev)); |
| 1357 | } |
| 1358 | |
Martin K. Petersen | 4363ac7 | 2012-09-18 12:19:27 -0400 | [diff] [blame] | 1359 | static inline unsigned int bdev_write_same(struct block_device *bdev) |
| 1360 | { |
| 1361 | struct request_queue *q = bdev_get_queue(bdev); |
| 1362 | |
| 1363 | if (q) |
| 1364 | return q->limits.max_write_same_sectors; |
| 1365 | |
| 1366 | return 0; |
| 1367 | } |
| 1368 | |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 1369 | static inline int queue_dma_alignment(struct request_queue *q) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1370 | { |
Pete Wyckoff | 482eb68 | 2008-01-01 10:23:02 -0500 | [diff] [blame] | 1371 | return q ? q->dma_alignment : 511; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1372 | } |
| 1373 | |
Namhyung Kim | 1441779 | 2010-09-15 13:08:27 +0200 | [diff] [blame] | 1374 | 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] | 1375 | unsigned int len) |
| 1376 | { |
| 1377 | unsigned int alignment = queue_dma_alignment(q) | q->dma_pad_mask; |
Namhyung Kim | 1441779 | 2010-09-15 13:08:27 +0200 | [diff] [blame] | 1378 | return !(addr & alignment) && !(len & alignment); |
FUJITA Tomonori | 8790407 | 2008-08-28 15:05:58 +0900 | [diff] [blame] | 1379 | } |
| 1380 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1381 | /* assumes size > 256 */ |
| 1382 | static inline unsigned int blksize_bits(unsigned int size) |
| 1383 | { |
| 1384 | unsigned int bits = 8; |
| 1385 | do { |
| 1386 | bits++; |
| 1387 | size >>= 1; |
| 1388 | } while (size > 256); |
| 1389 | return bits; |
| 1390 | } |
| 1391 | |
Adrian Bunk | 2befb9e | 2005-09-10 00:27:17 -0700 | [diff] [blame] | 1392 | static inline unsigned int block_size(struct block_device *bdev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1393 | { |
| 1394 | return bdev->bd_block_size; |
| 1395 | } |
| 1396 | |
shaohua.li@intel.com | f387693 | 2011-05-06 11:34:32 -0600 | [diff] [blame] | 1397 | static inline bool queue_flush_queueable(struct request_queue *q) |
| 1398 | { |
| 1399 | return !q->flush_not_queueable; |
| 1400 | } |
| 1401 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1402 | typedef struct {struct page *v;} Sector; |
| 1403 | |
| 1404 | unsigned char *read_dev_sector(struct block_device *, sector_t, Sector *); |
| 1405 | |
| 1406 | static inline void put_dev_sector(Sector p) |
| 1407 | { |
| 1408 | page_cache_release(p.v); |
| 1409 | } |
| 1410 | |
| 1411 | struct work_struct; |
Jens Axboe | 59c3d45 | 2014-04-08 09:15:35 -0600 | [diff] [blame] | 1412 | int kblockd_schedule_work(struct work_struct *work); |
| 1413 | int kblockd_schedule_delayed_work(struct delayed_work *dwork, unsigned long delay); |
Jens Axboe | 8ab1459 | 2014-04-08 09:17:40 -0600 | [diff] [blame] | 1414 | 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] | 1415 | |
Divyesh Shah | 9195291 | 2010-04-01 15:01:41 -0700 | [diff] [blame] | 1416 | #ifdef CONFIG_BLK_CGROUP |
Jens Axboe | 28f4197 | 2010-06-01 12:23:18 +0200 | [diff] [blame] | 1417 | /* |
| 1418 | * This should not be using sched_clock(). A real patch is in progress |
| 1419 | * to fix this up, until that is in place we need to disable preemption |
| 1420 | * around sched_clock() in this function and set_io_start_time_ns(). |
| 1421 | */ |
Divyesh Shah | 9195291 | 2010-04-01 15:01:41 -0700 | [diff] [blame] | 1422 | static inline void set_start_time_ns(struct request *req) |
| 1423 | { |
Jens Axboe | 28f4197 | 2010-06-01 12:23:18 +0200 | [diff] [blame] | 1424 | preempt_disable(); |
Divyesh Shah | 9195291 | 2010-04-01 15:01:41 -0700 | [diff] [blame] | 1425 | req->start_time_ns = sched_clock(); |
Jens Axboe | 28f4197 | 2010-06-01 12:23:18 +0200 | [diff] [blame] | 1426 | preempt_enable(); |
Divyesh Shah | 9195291 | 2010-04-01 15:01:41 -0700 | [diff] [blame] | 1427 | } |
| 1428 | |
| 1429 | static inline void set_io_start_time_ns(struct request *req) |
| 1430 | { |
Jens Axboe | 28f4197 | 2010-06-01 12:23:18 +0200 | [diff] [blame] | 1431 | preempt_disable(); |
Divyesh Shah | 9195291 | 2010-04-01 15:01:41 -0700 | [diff] [blame] | 1432 | req->io_start_time_ns = sched_clock(); |
Jens Axboe | 28f4197 | 2010-06-01 12:23:18 +0200 | [diff] [blame] | 1433 | preempt_enable(); |
Divyesh Shah | 9195291 | 2010-04-01 15:01:41 -0700 | [diff] [blame] | 1434 | } |
Divyesh Shah | 84c124d | 2010-04-09 08:31:19 +0200 | [diff] [blame] | 1435 | |
| 1436 | static inline uint64_t rq_start_time_ns(struct request *req) |
| 1437 | { |
| 1438 | return req->start_time_ns; |
| 1439 | } |
| 1440 | |
| 1441 | static inline uint64_t rq_io_start_time_ns(struct request *req) |
| 1442 | { |
| 1443 | return req->io_start_time_ns; |
| 1444 | } |
Divyesh Shah | 9195291 | 2010-04-01 15:01:41 -0700 | [diff] [blame] | 1445 | #else |
| 1446 | static inline void set_start_time_ns(struct request *req) {} |
| 1447 | static inline void set_io_start_time_ns(struct request *req) {} |
Divyesh Shah | 84c124d | 2010-04-09 08:31:19 +0200 | [diff] [blame] | 1448 | static inline uint64_t rq_start_time_ns(struct request *req) |
| 1449 | { |
| 1450 | return 0; |
| 1451 | } |
| 1452 | static inline uint64_t rq_io_start_time_ns(struct request *req) |
| 1453 | { |
| 1454 | return 0; |
| 1455 | } |
Divyesh Shah | 9195291 | 2010-04-01 15:01:41 -0700 | [diff] [blame] | 1456 | #endif |
| 1457 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1458 | #define MODULE_ALIAS_BLOCKDEV(major,minor) \ |
| 1459 | MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor)) |
| 1460 | #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \ |
| 1461 | MODULE_ALIAS("block-major-" __stringify(major) "-*") |
| 1462 | |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 1463 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
| 1464 | |
Jens Axboe | b24498d | 2008-06-27 09:12:09 +0200 | [diff] [blame] | 1465 | #define INTEGRITY_FLAG_READ 2 /* verify data integrity on read */ |
| 1466 | #define INTEGRITY_FLAG_WRITE 4 /* generate data integrity on write */ |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 1467 | |
| 1468 | struct blk_integrity_exchg { |
| 1469 | void *prot_buf; |
| 1470 | void *data_buf; |
| 1471 | sector_t sector; |
| 1472 | unsigned int data_size; |
| 1473 | unsigned short sector_size; |
| 1474 | const char *disk_name; |
| 1475 | }; |
| 1476 | |
| 1477 | typedef void (integrity_gen_fn) (struct blk_integrity_exchg *); |
| 1478 | typedef int (integrity_vrfy_fn) (struct blk_integrity_exchg *); |
| 1479 | typedef void (integrity_set_tag_fn) (void *, void *, unsigned int); |
| 1480 | typedef void (integrity_get_tag_fn) (void *, void *, unsigned int); |
| 1481 | |
| 1482 | struct blk_integrity { |
| 1483 | integrity_gen_fn *generate_fn; |
| 1484 | integrity_vrfy_fn *verify_fn; |
| 1485 | integrity_set_tag_fn *set_tag_fn; |
| 1486 | integrity_get_tag_fn *get_tag_fn; |
| 1487 | |
| 1488 | unsigned short flags; |
| 1489 | unsigned short tuple_size; |
| 1490 | unsigned short sector_size; |
| 1491 | unsigned short tag_size; |
| 1492 | |
| 1493 | const char *name; |
| 1494 | |
| 1495 | struct kobject kobj; |
| 1496 | }; |
| 1497 | |
Mike Snitzer | a63a5cf | 2011-04-01 21:02:31 +0200 | [diff] [blame] | 1498 | extern bool blk_integrity_is_initialized(struct gendisk *); |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 1499 | extern int blk_integrity_register(struct gendisk *, struct blk_integrity *); |
| 1500 | extern void blk_integrity_unregister(struct gendisk *); |
Martin K. Petersen | ad7fce9 | 2008-10-01 03:38:39 -0400 | [diff] [blame] | 1501 | extern int blk_integrity_compare(struct gendisk *, struct gendisk *); |
Martin K. Petersen | 13f05c8 | 2010-09-10 20:50:10 +0200 | [diff] [blame] | 1502 | extern int blk_rq_map_integrity_sg(struct request_queue *, struct bio *, |
| 1503 | struct scatterlist *); |
| 1504 | extern int blk_rq_count_integrity_sg(struct request_queue *, struct bio *); |
| 1505 | extern int blk_integrity_merge_rq(struct request_queue *, struct request *, |
| 1506 | struct request *); |
| 1507 | extern int blk_integrity_merge_bio(struct request_queue *, struct request *, |
| 1508 | struct bio *); |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 1509 | |
Jens Axboe | b04accc | 2008-10-02 12:53:22 +0200 | [diff] [blame] | 1510 | static inline |
| 1511 | struct blk_integrity *bdev_get_integrity(struct block_device *bdev) |
| 1512 | { |
| 1513 | return bdev->bd_disk->integrity; |
| 1514 | } |
| 1515 | |
Martin K. Petersen | b02739b | 2008-10-02 18:47:49 +0200 | [diff] [blame] | 1516 | static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk) |
| 1517 | { |
| 1518 | return disk->integrity; |
| 1519 | } |
| 1520 | |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 1521 | static inline int blk_integrity_rq(struct request *rq) |
| 1522 | { |
Martin K. Petersen | d442cc4 | 2008-07-16 16:09:06 -0400 | [diff] [blame] | 1523 | if (rq->bio == NULL) |
| 1524 | return 0; |
| 1525 | |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 1526 | return bio_integrity(rq->bio); |
| 1527 | } |
| 1528 | |
Martin K. Petersen | 13f05c8 | 2010-09-10 20:50:10 +0200 | [diff] [blame] | 1529 | static inline void blk_queue_max_integrity_segments(struct request_queue *q, |
| 1530 | unsigned int segs) |
| 1531 | { |
| 1532 | q->limits.max_integrity_segments = segs; |
| 1533 | } |
| 1534 | |
| 1535 | static inline unsigned short |
| 1536 | queue_max_integrity_segments(struct request_queue *q) |
| 1537 | { |
| 1538 | return q->limits.max_integrity_segments; |
| 1539 | } |
| 1540 | |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 1541 | #else /* CONFIG_BLK_DEV_INTEGRITY */ |
| 1542 | |
Stephen Rothwell | fd83240 | 2012-01-12 09:17:30 +0100 | [diff] [blame] | 1543 | struct bio; |
| 1544 | struct block_device; |
| 1545 | struct gendisk; |
| 1546 | struct blk_integrity; |
| 1547 | |
| 1548 | static inline int blk_integrity_rq(struct request *rq) |
| 1549 | { |
| 1550 | return 0; |
| 1551 | } |
| 1552 | static inline int blk_rq_count_integrity_sg(struct request_queue *q, |
| 1553 | struct bio *b) |
| 1554 | { |
| 1555 | return 0; |
| 1556 | } |
| 1557 | static inline int blk_rq_map_integrity_sg(struct request_queue *q, |
| 1558 | struct bio *b, |
| 1559 | struct scatterlist *s) |
| 1560 | { |
| 1561 | return 0; |
| 1562 | } |
| 1563 | static inline struct blk_integrity *bdev_get_integrity(struct block_device *b) |
| 1564 | { |
| 1565 | return 0; |
| 1566 | } |
| 1567 | static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk) |
| 1568 | { |
| 1569 | return NULL; |
| 1570 | } |
| 1571 | static inline int blk_integrity_compare(struct gendisk *a, struct gendisk *b) |
| 1572 | { |
| 1573 | return 0; |
| 1574 | } |
| 1575 | static inline int blk_integrity_register(struct gendisk *d, |
| 1576 | struct blk_integrity *b) |
| 1577 | { |
| 1578 | return 0; |
| 1579 | } |
| 1580 | static inline void blk_integrity_unregister(struct gendisk *d) |
| 1581 | { |
| 1582 | } |
| 1583 | static inline void blk_queue_max_integrity_segments(struct request_queue *q, |
| 1584 | unsigned int segs) |
| 1585 | { |
| 1586 | } |
| 1587 | static inline unsigned short queue_max_integrity_segments(struct request_queue *q) |
| 1588 | { |
| 1589 | return 0; |
| 1590 | } |
| 1591 | static inline int blk_integrity_merge_rq(struct request_queue *rq, |
| 1592 | struct request *r1, |
| 1593 | struct request *r2) |
| 1594 | { |
| 1595 | return 0; |
| 1596 | } |
| 1597 | static inline int blk_integrity_merge_bio(struct request_queue *rq, |
| 1598 | struct request *r, |
| 1599 | struct bio *b) |
| 1600 | { |
| 1601 | return 0; |
| 1602 | } |
| 1603 | static inline bool blk_integrity_is_initialized(struct gendisk *g) |
| 1604 | { |
| 1605 | return 0; |
| 1606 | } |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 1607 | |
| 1608 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ |
| 1609 | |
Al Viro | 08f8585 | 2007-10-08 13:26:20 -0400 | [diff] [blame] | 1610 | struct block_device_operations { |
Al Viro | d4430d62 | 2008-03-02 09:09:22 -0500 | [diff] [blame] | 1611 | int (*open) (struct block_device *, fmode_t); |
Al Viro | db2a144 | 2013-05-05 21:52:57 -0400 | [diff] [blame] | 1612 | void (*release) (struct gendisk *, fmode_t); |
Matthew Wilcox | 47a191f | 2014-06-04 16:07:46 -0700 | [diff] [blame] | 1613 | int (*rw_page)(struct block_device *, sector_t, struct page *, int rw); |
Al Viro | d4430d62 | 2008-03-02 09:09:22 -0500 | [diff] [blame] | 1614 | int (*ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); |
| 1615 | int (*compat_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); |
Al Viro | 08f8585 | 2007-10-08 13:26:20 -0400 | [diff] [blame] | 1616 | int (*direct_access) (struct block_device *, sector_t, |
| 1617 | void **, unsigned long *); |
Tejun Heo | 77ea887 | 2010-12-08 20:57:37 +0100 | [diff] [blame] | 1618 | unsigned int (*check_events) (struct gendisk *disk, |
| 1619 | unsigned int clearing); |
| 1620 | /* ->media_changed() is DEPRECATED, use ->check_events() instead */ |
Al Viro | 08f8585 | 2007-10-08 13:26:20 -0400 | [diff] [blame] | 1621 | int (*media_changed) (struct gendisk *); |
Tejun Heo | c3e33e0 | 2010-05-15 20:09:29 +0200 | [diff] [blame] | 1622 | void (*unlock_native_capacity) (struct gendisk *); |
Al Viro | 08f8585 | 2007-10-08 13:26:20 -0400 | [diff] [blame] | 1623 | int (*revalidate_disk) (struct gendisk *); |
| 1624 | int (*getgeo)(struct block_device *, struct hd_geometry *); |
Nitin Gupta | b3a27d0 | 2010-05-17 11:02:43 +0530 | [diff] [blame] | 1625 | /* this callback is with swap_lock and sometimes page table lock held */ |
| 1626 | void (*swap_slot_free_notify) (struct block_device *, unsigned long); |
Al Viro | 08f8585 | 2007-10-08 13:26:20 -0400 | [diff] [blame] | 1627 | struct module *owner; |
| 1628 | }; |
| 1629 | |
Al Viro | 633a08b | 2007-08-29 20:34:12 -0400 | [diff] [blame] | 1630 | extern int __blkdev_driver_ioctl(struct block_device *, fmode_t, unsigned int, |
| 1631 | unsigned long); |
Matthew Wilcox | 47a191f | 2014-06-04 16:07:46 -0700 | [diff] [blame] | 1632 | extern int bdev_read_page(struct block_device *, sector_t, struct page *); |
| 1633 | extern int bdev_write_page(struct block_device *, sector_t, struct page *, |
| 1634 | struct writeback_control *); |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 1635 | #else /* CONFIG_BLOCK */ |
Fabian Frederick | ac13a82 | 2014-06-04 16:06:27 -0700 | [diff] [blame] | 1636 | |
| 1637 | struct block_device; |
| 1638 | |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 1639 | /* |
| 1640 | * stubs for when the block layer is configured out |
| 1641 | */ |
| 1642 | #define buffer_heads_over_limit 0 |
| 1643 | |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 1644 | static inline long nr_blockdev_pages(void) |
| 1645 | { |
| 1646 | return 0; |
| 1647 | } |
| 1648 | |
Jens Axboe | 1f940bd | 2011-03-11 20:17:08 +0100 | [diff] [blame] | 1649 | struct blk_plug { |
| 1650 | }; |
| 1651 | |
| 1652 | static inline void blk_start_plug(struct blk_plug *plug) |
Jens Axboe | 73c1010 | 2011-03-08 13:19:51 +0100 | [diff] [blame] | 1653 | { |
| 1654 | } |
| 1655 | |
Jens Axboe | 1f940bd | 2011-03-11 20:17:08 +0100 | [diff] [blame] | 1656 | static inline void blk_finish_plug(struct blk_plug *plug) |
Jens Axboe | 73c1010 | 2011-03-08 13:19:51 +0100 | [diff] [blame] | 1657 | { |
| 1658 | } |
| 1659 | |
Jens Axboe | 1f940bd | 2011-03-11 20:17:08 +0100 | [diff] [blame] | 1660 | static inline void blk_flush_plug(struct task_struct *task) |
Jens Axboe | 73c1010 | 2011-03-08 13:19:51 +0100 | [diff] [blame] | 1661 | { |
| 1662 | } |
| 1663 | |
Jens Axboe | a237c1c | 2011-04-16 13:27:55 +0200 | [diff] [blame] | 1664 | static inline void blk_schedule_flush_plug(struct task_struct *task) |
| 1665 | { |
| 1666 | } |
| 1667 | |
| 1668 | |
Jens Axboe | 73c1010 | 2011-03-08 13:19:51 +0100 | [diff] [blame] | 1669 | static inline bool blk_needs_flush_plug(struct task_struct *tsk) |
| 1670 | { |
| 1671 | return false; |
| 1672 | } |
| 1673 | |
Fabian Frederick | ac13a82 | 2014-06-04 16:06:27 -0700 | [diff] [blame] | 1674 | static inline int blkdev_issue_flush(struct block_device *bdev, gfp_t gfp_mask, |
| 1675 | sector_t *error_sector) |
| 1676 | { |
| 1677 | return 0; |
| 1678 | } |
| 1679 | |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 1680 | #endif /* CONFIG_BLOCK */ |
| 1681 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1682 | #endif |