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> |
| 11 | #include <linux/timer.h> |
| 12 | #include <linux/workqueue.h> |
| 13 | #include <linux/pagemap.h> |
| 14 | #include <linux/backing-dev.h> |
| 15 | #include <linux/wait.h> |
| 16 | #include <linux/mempool.h> |
| 17 | #include <linux/bio.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | #include <linux/stringify.h> |
Hugh Dickins | 3e6053d | 2008-09-11 10:57:55 +0200 | [diff] [blame] | 19 | #include <linux/gfp.h> |
FUJITA Tomonori | d351af0 | 2007-07-09 12:40:35 +0200 | [diff] [blame] | 20 | #include <linux/bsg.h> |
Jens Axboe | c7c22e4 | 2008-09-13 20:26:01 +0200 | [diff] [blame] | 21 | #include <linux/smp.h> |
Tejun Heo | 548bc8e | 2013-01-09 08:05:13 -0800 | [diff] [blame] | 22 | #include <linux/rcupdate.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | |
| 24 | #include <asm/scatterlist.h> |
| 25 | |
Paul Gortmaker | de47725 | 2011-05-26 13:46:22 -0400 | [diff] [blame] | 26 | struct module; |
Christoph Hellwig | 21b2f0c | 2006-03-22 17:52:04 +0100 | [diff] [blame] | 27 | struct scsi_ioctl_command; |
| 28 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | struct request_queue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | struct elevator_queue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | struct request_pm_state; |
Jens Axboe | 2056a78 | 2006-03-23 20:00:26 +0100 | [diff] [blame] | 32 | struct blk_trace; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 33 | struct request; |
| 34 | struct sg_io_hdr; |
Mike Christie | aa387cc | 2011-07-31 22:05:09 +0200 | [diff] [blame] | 35 | struct bsg_job; |
Tejun Heo | 3c79839 | 2012-04-16 13:57:25 -0700 | [diff] [blame] | 36 | struct blkcg_gq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | |
| 38 | #define BLKDEV_MIN_RQ 4 |
| 39 | #define BLKDEV_MAX_RQ 128 /* Default maximum */ |
| 40 | |
Tejun Heo | 8bd435b | 2012-04-13 13:11:28 -0700 | [diff] [blame] | 41 | /* |
| 42 | * Maximum number of blkcg policies allowed to be registered concurrently. |
| 43 | * Defined here to simplify include dependency. |
| 44 | */ |
| 45 | #define BLKCG_MAX_POLS 2 |
| 46 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | struct request; |
Tejun Heo | 8ffdc65 | 2006-01-06 09:49:03 +0100 | [diff] [blame] | 48 | typedef void (rq_end_io_fn)(struct request *, int); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | |
Tejun Heo | 5b788ce | 2012-06-04 20:40:59 -0700 | [diff] [blame] | 50 | #define BLK_RL_SYNCFULL (1U << 0) |
| 51 | #define BLK_RL_ASYNCFULL (1U << 1) |
| 52 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | struct request_list { |
Tejun Heo | 5b788ce | 2012-06-04 20:40:59 -0700 | [diff] [blame] | 54 | struct request_queue *q; /* the queue this rl belongs to */ |
Tejun Heo | a051661 | 2012-06-26 15:05:44 -0700 | [diff] [blame] | 55 | #ifdef CONFIG_BLK_CGROUP |
| 56 | struct blkcg_gq *blkg; /* blkg this request pool belongs to */ |
| 57 | #endif |
Jens Axboe | 1faa16d | 2009-04-06 14:48:01 +0200 | [diff] [blame] | 58 | /* |
| 59 | * count[], starved[], and wait[] are indexed by |
| 60 | * BLK_RW_SYNC/BLK_RW_ASYNC |
| 61 | */ |
Tejun Heo | 8a5ecdd | 2012-06-04 20:40:58 -0700 | [diff] [blame] | 62 | int count[2]; |
| 63 | int starved[2]; |
| 64 | mempool_t *rq_pool; |
| 65 | wait_queue_head_t wait[2]; |
Tejun Heo | 5b788ce | 2012-06-04 20:40:59 -0700 | [diff] [blame] | 66 | unsigned int flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | }; |
| 68 | |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 69 | /* |
| 70 | * request command types |
| 71 | */ |
| 72 | enum rq_cmd_type_bits { |
| 73 | REQ_TYPE_FS = 1, /* fs request */ |
| 74 | REQ_TYPE_BLOCK_PC, /* scsi command */ |
| 75 | REQ_TYPE_SENSE, /* sense request */ |
| 76 | REQ_TYPE_PM_SUSPEND, /* suspend request */ |
| 77 | REQ_TYPE_PM_RESUME, /* resume request */ |
| 78 | REQ_TYPE_PM_SHUTDOWN, /* shutdown request */ |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 79 | REQ_TYPE_SPECIAL, /* driver defined type */ |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 80 | /* |
| 81 | * for ATA/ATAPI devices. this really doesn't belong here, ide should |
| 82 | * use REQ_TYPE_SPECIAL and use rq->cmd[0] with the range of driver |
| 83 | * private REQ_LB opcodes to differentiate what type of request this is |
| 84 | */ |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 85 | REQ_TYPE_ATA_TASKFILE, |
Jens Axboe | cea2885 | 2006-10-12 15:08:45 +0200 | [diff] [blame] | 86 | REQ_TYPE_ATA_PC, |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 87 | }; |
| 88 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | #define BLK_MAX_CDB 16 |
| 90 | |
| 91 | /* |
Jens Axboe | 63a7138 | 2008-02-08 12:41:03 +0100 | [diff] [blame] | 92 | * try to put the fields that are referenced together in the same cacheline. |
Wanlong Gao | 4d0d98b6 | 2011-06-13 10:45:38 +0200 | [diff] [blame] | 93 | * if you modify this structure, be sure to check block/blk-core.c:blk_rq_init() |
Jens Axboe | 63a7138 | 2008-02-08 12:41:03 +0100 | [diff] [blame] | 94 | * as well! |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | */ |
| 96 | struct request { |
Jens Axboe | ff856ba | 2006-01-09 16:02:34 +0100 | [diff] [blame] | 97 | struct list_head queuelist; |
Jens Axboe | c7c22e4 | 2008-09-13 20:26:01 +0200 | [diff] [blame] | 98 | struct call_single_data csd; |
Jens Axboe | ff856ba | 2006-01-09 16:02:34 +0100 | [diff] [blame] | 99 | |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 100 | struct request_queue *q; |
Jens Axboe | e6a1c87 | 2006-08-10 09:00:21 +0200 | [diff] [blame] | 101 | |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 102 | unsigned int cmd_flags; |
| 103 | enum rq_cmd_type_bits cmd_type; |
Jens Axboe | 242f9dc | 2008-09-14 05:55:09 -0700 | [diff] [blame] | 104 | unsigned long atomic_flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | |
Richard Kennedy | 181fdde | 2010-03-19 08:58:16 +0100 | [diff] [blame] | 106 | int cpu; |
| 107 | |
Tejun Heo | a2dec7b | 2009-05-07 22:24:44 +0900 | [diff] [blame] | 108 | /* the following two fields are internal, NEVER access directly */ |
Tejun Heo | a2dec7b | 2009-05-07 22:24:44 +0900 | [diff] [blame] | 109 | unsigned int __data_len; /* total data len */ |
Richard Kennedy | 181fdde | 2010-03-19 08:58:16 +0100 | [diff] [blame] | 110 | sector_t __sector; /* sector cursor */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | |
| 112 | struct bio *bio; |
| 113 | struct bio *biotail; |
| 114 | |
Jens Axboe | 9817064 | 2006-07-28 09:23:08 +0200 | [diff] [blame] | 115 | struct hlist_node hash; /* merge hash */ |
Jens Axboe | e6a1c87 | 2006-08-10 09:00:21 +0200 | [diff] [blame] | 116 | /* |
| 117 | * The rb_node is only used inside the io scheduler, requests |
| 118 | * are pruned when moved to the dispatch queue. So let the |
Mike Snitzer | c186794 | 2011-02-11 11:08:00 +0100 | [diff] [blame] | 119 | * completion_data share space with the rb_node. |
Jens Axboe | e6a1c87 | 2006-08-10 09:00:21 +0200 | [diff] [blame] | 120 | */ |
| 121 | union { |
| 122 | struct rb_node rb_node; /* sort/lookup */ |
Mike Snitzer | c186794 | 2011-02-11 11:08:00 +0100 | [diff] [blame] | 123 | void *completion_data; |
Jens Axboe | e6a1c87 | 2006-08-10 09:00:21 +0200 | [diff] [blame] | 124 | }; |
Jens Axboe | 9817064 | 2006-07-28 09:23:08 +0200 | [diff] [blame] | 125 | |
Jens Axboe | ff7d145 | 2006-07-12 14:04:37 +0200 | [diff] [blame] | 126 | /* |
Vivek Goyal | 7f1dc8a | 2010-04-21 17:44:16 +0200 | [diff] [blame] | 127 | * Three pointers are available for the IO schedulers, if they need |
Mike Snitzer | c186794 | 2011-02-11 11:08:00 +0100 | [diff] [blame] | 128 | * more they have to dynamically allocate it. Flush requests are |
| 129 | * never put on the IO scheduler. So let the flush fields share |
Tejun Heo | a612fdd | 2011-12-14 00:33:41 +0100 | [diff] [blame] | 130 | * space with the elevator data. |
Jens Axboe | ff7d145 | 2006-07-12 14:04:37 +0200 | [diff] [blame] | 131 | */ |
Mike Snitzer | c186794 | 2011-02-11 11:08:00 +0100 | [diff] [blame] | 132 | union { |
Tejun Heo | a612fdd | 2011-12-14 00:33:41 +0100 | [diff] [blame] | 133 | struct { |
| 134 | struct io_cq *icq; |
| 135 | void *priv[2]; |
| 136 | } elv; |
| 137 | |
Mike Snitzer | c186794 | 2011-02-11 11:08:00 +0100 | [diff] [blame] | 138 | struct { |
| 139 | unsigned int seq; |
| 140 | struct list_head list; |
Jeff Moyer | 4853aba | 2011-08-15 21:37:25 +0200 | [diff] [blame] | 141 | rq_end_io_fn *saved_end_io; |
Mike Snitzer | c186794 | 2011-02-11 11:08:00 +0100 | [diff] [blame] | 142 | } flush; |
| 143 | }; |
Jens Axboe | ff7d145 | 2006-07-12 14:04:37 +0200 | [diff] [blame] | 144 | |
Jens Axboe | 8f34ee7 | 2006-06-13 09:02:34 +0200 | [diff] [blame] | 145 | struct gendisk *rq_disk; |
Jerome Marchand | 09e099d | 2011-01-05 16:57:38 +0100 | [diff] [blame] | 146 | struct hd_struct *part; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | unsigned long start_time; |
Divyesh Shah | 9195291 | 2010-04-01 15:01:41 -0700 | [diff] [blame] | 148 | #ifdef CONFIG_BLK_CGROUP |
Tejun Heo | a051661 | 2012-06-26 15:05:44 -0700 | [diff] [blame] | 149 | struct request_list *rl; /* rl this rq is alloced from */ |
Divyesh Shah | 9195291 | 2010-04-01 15:01:41 -0700 | [diff] [blame] | 150 | unsigned long long start_time_ns; |
| 151 | unsigned long long io_start_time_ns; /* when passed to hardware */ |
| 152 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | /* Number of scatter-gather DMA addr+len pairs after |
| 154 | * physical address coalescing is performed. |
| 155 | */ |
| 156 | unsigned short nr_phys_segments; |
Martin K. Petersen | 13f05c8 | 2010-09-10 20:50:10 +0200 | [diff] [blame] | 157 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
| 158 | unsigned short nr_integrity_segments; |
| 159 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 160 | |
Jens Axboe | 8f34ee7 | 2006-06-13 09:02:34 +0200 | [diff] [blame] | 161 | unsigned short ioprio; |
| 162 | |
Richard Kennedy | 181fdde | 2010-03-19 08:58:16 +0100 | [diff] [blame] | 163 | int ref_count; |
| 164 | |
Tejun Heo | 731ec49 | 2009-04-23 11:05:20 +0900 | [diff] [blame] | 165 | void *special; /* opaque pointer available for LLD use */ |
| 166 | char *buffer; /* kaddr of the current segment if available */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 167 | |
Jens Axboe | cdd6026 | 2006-07-28 09:32:07 +0200 | [diff] [blame] | 168 | int tag; |
| 169 | int errors; |
| 170 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 171 | /* |
| 172 | * when request is used as a packet command carrier |
| 173 | */ |
FUJITA Tomonori | d7e3c32 | 2008-04-29 09:54:39 +0200 | [diff] [blame] | 174 | unsigned char __cmd[BLK_MAX_CDB]; |
| 175 | unsigned char *cmd; |
Richard Kennedy | 181fdde | 2010-03-19 08:58:16 +0100 | [diff] [blame] | 176 | unsigned short cmd_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 177 | |
FUJITA Tomonori | 7a85f88 | 2008-03-04 11:17:11 +0100 | [diff] [blame] | 178 | unsigned int extra_len; /* length of alignment and padding */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | unsigned int sense_len; |
Tejun Heo | c3a4d78 | 2009-05-07 22:24:37 +0900 | [diff] [blame] | 180 | unsigned int resid_len; /* residual count */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 181 | void *sense; |
| 182 | |
Jens Axboe | 242f9dc | 2008-09-14 05:55:09 -0700 | [diff] [blame] | 183 | unsigned long deadline; |
| 184 | struct list_head timeout_list; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 185 | unsigned int timeout; |
Mike Christie | 17e01f2 | 2005-11-11 05:31:37 -0600 | [diff] [blame] | 186 | int retries; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 187 | |
| 188 | /* |
Jens Axboe | c00895a | 2006-09-30 20:29:12 +0200 | [diff] [blame] | 189 | * completion callback. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 190 | */ |
| 191 | rq_end_io_fn *end_io; |
| 192 | void *end_io_data; |
FUJITA Tomonori | abae1fd | 2007-07-16 08:52:14 +0200 | [diff] [blame] | 193 | |
| 194 | /* for bidi */ |
| 195 | struct request *next_rq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 196 | }; |
| 197 | |
Fernando Luis Vázquez Cao | 766ca44 | 2008-08-14 09:59:13 +0200 | [diff] [blame] | 198 | static inline unsigned short req_get_ioprio(struct request *req) |
| 199 | { |
| 200 | return req->ioprio; |
| 201 | } |
| 202 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 203 | /* |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 204 | * 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] | 205 | * requests. Some step values could eventually be made generic. |
| 206 | */ |
| 207 | struct request_pm_state |
| 208 | { |
| 209 | /* PM state machine step value, currently driver specific */ |
| 210 | int pm_step; |
| 211 | /* requested PM state value (S1, S2, S3, S4, ...) */ |
| 212 | u32 pm_state; |
| 213 | void* data; /* for driver use */ |
| 214 | }; |
| 215 | |
| 216 | #include <linux/elevator.h> |
| 217 | |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 218 | typedef void (request_fn_proc) (struct request_queue *q); |
Christoph Hellwig | 5a7bbad | 2011-09-12 12:12:01 +0200 | [diff] [blame] | 219 | typedef void (make_request_fn) (struct request_queue *q, struct bio *bio); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 220 | typedef int (prep_rq_fn) (struct request_queue *, struct request *); |
James Bottomley | 28018c2 | 2010-07-01 19:49:17 +0900 | [diff] [blame] | 221 | typedef void (unprep_rq_fn) (struct request_queue *, struct request *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 222 | |
| 223 | struct bio_vec; |
Alasdair G Kergon | cc371e6 | 2008-07-03 09:53:43 +0200 | [diff] [blame] | 224 | struct bvec_merge_data { |
| 225 | struct block_device *bi_bdev; |
| 226 | sector_t bi_sector; |
| 227 | unsigned bi_size; |
| 228 | unsigned long bi_rw; |
| 229 | }; |
| 230 | typedef int (merge_bvec_fn) (struct request_queue *, struct bvec_merge_data *, |
| 231 | struct bio_vec *); |
Jens Axboe | ff856ba | 2006-01-09 16:02:34 +0100 | [diff] [blame] | 232 | typedef void (softirq_done_fn)(struct request *); |
Tejun Heo | 2fb98e8 | 2008-02-19 11:36:53 +0100 | [diff] [blame] | 233 | typedef int (dma_drain_needed_fn)(struct request *); |
Kiyoshi Ueda | ef9e3fa | 2008-10-01 16:12:15 +0200 | [diff] [blame] | 234 | typedef int (lld_busy_fn) (struct request_queue *q); |
Mike Christie | aa387cc | 2011-07-31 22:05:09 +0200 | [diff] [blame] | 235 | typedef int (bsg_job_fn) (struct bsg_job *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 236 | |
Jens Axboe | 242f9dc | 2008-09-14 05:55:09 -0700 | [diff] [blame] | 237 | enum blk_eh_timer_return { |
| 238 | BLK_EH_NOT_HANDLED, |
| 239 | BLK_EH_HANDLED, |
| 240 | BLK_EH_RESET_TIMER, |
| 241 | }; |
| 242 | |
| 243 | typedef enum blk_eh_timer_return (rq_timed_out_fn)(struct request *); |
| 244 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 245 | enum blk_queue_state { |
| 246 | Queue_down, |
| 247 | Queue_up, |
| 248 | }; |
| 249 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 250 | struct blk_queue_tag { |
| 251 | struct request **tag_index; /* map of busy tags */ |
| 252 | unsigned long *tag_map; /* bit map of free/busy tags */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 253 | int busy; /* current depth */ |
| 254 | int max_depth; /* what we will send to device */ |
Tejun Heo | ba02508 | 2005-08-05 13:28:11 -0700 | [diff] [blame] | 255 | int real_max_depth; /* what the array can hold */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 256 | atomic_t refcnt; /* map can be shared */ |
| 257 | }; |
| 258 | |
FUJITA Tomonori | abf5439 | 2008-08-16 14:10:05 +0900 | [diff] [blame] | 259 | #define BLK_SCSI_MAX_CMDS (256) |
| 260 | #define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8)) |
| 261 | |
Martin K. Petersen | 025146e | 2009-05-22 17:17:51 -0400 | [diff] [blame] | 262 | struct queue_limits { |
| 263 | unsigned long bounce_pfn; |
| 264 | unsigned long seg_boundary_mask; |
| 265 | |
| 266 | unsigned int max_hw_sectors; |
| 267 | unsigned int max_sectors; |
| 268 | unsigned int max_segment_size; |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 269 | unsigned int physical_block_size; |
| 270 | unsigned int alignment_offset; |
| 271 | unsigned int io_min; |
| 272 | unsigned int io_opt; |
Christoph Hellwig | 67efc92 | 2009-09-30 13:54:20 +0200 | [diff] [blame] | 273 | unsigned int max_discard_sectors; |
Martin K. Petersen | 4363ac7 | 2012-09-18 12:19:27 -0400 | [diff] [blame] | 274 | unsigned int max_write_same_sectors; |
Martin K. Petersen | 86b3728 | 2009-11-10 11:50:21 +0100 | [diff] [blame] | 275 | unsigned int discard_granularity; |
| 276 | unsigned int discard_alignment; |
Martin K. Petersen | 025146e | 2009-05-22 17:17:51 -0400 | [diff] [blame] | 277 | |
| 278 | unsigned short logical_block_size; |
Martin K. Petersen | 8a78362 | 2010-02-26 00:20:39 -0500 | [diff] [blame] | 279 | unsigned short max_segments; |
Martin K. Petersen | 13f05c8 | 2010-09-10 20:50:10 +0200 | [diff] [blame] | 280 | unsigned short max_integrity_segments; |
Martin K. Petersen | 025146e | 2009-05-22 17:17:51 -0400 | [diff] [blame] | 281 | |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 282 | unsigned char misaligned; |
Martin K. Petersen | 86b3728 | 2009-11-10 11:50:21 +0100 | [diff] [blame] | 283 | unsigned char discard_misaligned; |
Martin K. Petersen | e692cb6 | 2010-12-01 19:41:49 +0100 | [diff] [blame] | 284 | unsigned char cluster; |
Martin K. Petersen | a934a00 | 2011-05-18 10:37:35 +0200 | [diff] [blame] | 285 | unsigned char discard_zeroes_data; |
Martin K. Petersen | 025146e | 2009-05-22 17:17:51 -0400 | [diff] [blame] | 286 | }; |
| 287 | |
Richard Kennedy | d7b7630 | 2011-07-13 21:17:23 +0200 | [diff] [blame] | 288 | struct request_queue { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 289 | /* |
| 290 | * Together with queue_head for cacheline sharing |
| 291 | */ |
| 292 | struct list_head queue_head; |
| 293 | struct request *last_merge; |
Jens Axboe | b374d18 | 2008-10-31 10:05:07 +0100 | [diff] [blame] | 294 | struct elevator_queue *elevator; |
Tejun Heo | 8a5ecdd | 2012-06-04 20:40:58 -0700 | [diff] [blame] | 295 | int nr_rqs[2]; /* # allocated [a]sync rqs */ |
| 296 | int nr_rqs_elvpriv; /* # allocated rqs w/ elvpriv */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 297 | |
| 298 | /* |
Tejun Heo | a051661 | 2012-06-26 15:05:44 -0700 | [diff] [blame] | 299 | * If blkcg is not used, @q->root_rl serves all requests. If blkcg |
| 300 | * is used, root blkg allocates from @q->root_rl and all other |
| 301 | * blkgs from their own blkg->rl. Which one to use should be |
| 302 | * determined using bio_request_list(). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 303 | */ |
Tejun Heo | a051661 | 2012-06-26 15:05:44 -0700 | [diff] [blame] | 304 | struct request_list root_rl; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 305 | |
| 306 | request_fn_proc *request_fn; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 307 | make_request_fn *make_request_fn; |
| 308 | prep_rq_fn *prep_rq_fn; |
James Bottomley | 28018c2 | 2010-07-01 19:49:17 +0900 | [diff] [blame] | 309 | unprep_rq_fn *unprep_rq_fn; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 310 | merge_bvec_fn *merge_bvec_fn; |
Jens Axboe | ff856ba | 2006-01-09 16:02:34 +0100 | [diff] [blame] | 311 | softirq_done_fn *softirq_done_fn; |
Jens Axboe | 242f9dc | 2008-09-14 05:55:09 -0700 | [diff] [blame] | 312 | rq_timed_out_fn *rq_timed_out_fn; |
Tejun Heo | 2fb98e8 | 2008-02-19 11:36:53 +0100 | [diff] [blame] | 313 | dma_drain_needed_fn *dma_drain_needed; |
Kiyoshi Ueda | ef9e3fa | 2008-10-01 16:12:15 +0200 | [diff] [blame] | 314 | lld_busy_fn *lld_busy_fn; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 315 | |
| 316 | /* |
Tejun Heo | 8922e16 | 2005-10-20 16:23:44 +0200 | [diff] [blame] | 317 | * Dispatch queue sorting |
| 318 | */ |
Jens Axboe | 1b47f53 | 2005-10-20 16:37:00 +0200 | [diff] [blame] | 319 | sector_t end_sector; |
Tejun Heo | 8922e16 | 2005-10-20 16:23:44 +0200 | [diff] [blame] | 320 | struct request *boundary_rq; |
Tejun Heo | 8922e16 | 2005-10-20 16:23:44 +0200 | [diff] [blame] | 321 | |
| 322 | /* |
Jens Axboe | 3cca6dc | 2011-03-02 11:08:00 -0500 | [diff] [blame] | 323 | * Delayed queue handling |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 324 | */ |
Jens Axboe | 3cca6dc | 2011-03-02 11:08:00 -0500 | [diff] [blame] | 325 | struct delayed_work delay_work; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 326 | |
| 327 | struct backing_dev_info backing_dev_info; |
| 328 | |
| 329 | /* |
| 330 | * The queue owner gets to use this for whatever they like. |
| 331 | * ll_rw_blk doesn't touch it. |
| 332 | */ |
| 333 | void *queuedata; |
| 334 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 335 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 336 | * various queue flags, see QUEUE_* below |
| 337 | */ |
| 338 | unsigned long queue_flags; |
| 339 | |
| 340 | /* |
Tejun Heo | a73f730 | 2011-12-14 00:33:37 +0100 | [diff] [blame] | 341 | * ida allocated id for this queue. Used to index queues from |
| 342 | * ioctx. |
| 343 | */ |
| 344 | int id; |
| 345 | |
| 346 | /* |
Richard Kennedy | d7b7630 | 2011-07-13 21:17:23 +0200 | [diff] [blame] | 347 | * queue needs bounce pages for pages above this limit |
| 348 | */ |
| 349 | gfp_t bounce_gfp; |
| 350 | |
| 351 | /* |
| 152587d | 2005-04-12 16:22:06 -0500 | [diff] [blame] | 352 | * protects queue structures from reentrancy. ->__queue_lock should |
| 353 | * _never_ be used directly, it is queue private. always use |
| 354 | * ->queue_lock. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 355 | */ |
| 152587d | 2005-04-12 16:22:06 -0500 | [diff] [blame] | 356 | spinlock_t __queue_lock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 357 | spinlock_t *queue_lock; |
| 358 | |
| 359 | /* |
| 360 | * queue kobject |
| 361 | */ |
| 362 | struct kobject kobj; |
| 363 | |
Lin Ming | 6c95466 | 2013-03-23 11:42:26 +0800 | [diff] [blame] | 364 | #ifdef CONFIG_PM_RUNTIME |
| 365 | struct device *dev; |
| 366 | int rpm_status; |
| 367 | unsigned int nr_pending; |
| 368 | #endif |
| 369 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 370 | /* |
| 371 | * queue settings |
| 372 | */ |
| 373 | unsigned long nr_requests; /* Max # of requests */ |
| 374 | unsigned int nr_congestion_on; |
| 375 | unsigned int nr_congestion_off; |
| 376 | unsigned int nr_batching; |
| 377 | |
James Bottomley | fa0ccd8 | 2008-01-10 11:30:36 -0600 | [diff] [blame] | 378 | unsigned int dma_drain_size; |
Richard Kennedy | d7b7630 | 2011-07-13 21:17:23 +0200 | [diff] [blame] | 379 | void *dma_drain_buffer; |
Tejun Heo | e3790c7 | 2008-03-04 11:18:17 +0100 | [diff] [blame] | 380 | unsigned int dma_pad_mask; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 381 | unsigned int dma_alignment; |
| 382 | |
| 383 | struct blk_queue_tag *queue_tags; |
Jens Axboe | 6eca900 | 2007-10-25 10:14:47 +0200 | [diff] [blame] | 384 | struct list_head tag_busy_list; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 385 | |
Tejun Heo | 15853af | 2005-11-10 08:52:05 +0100 | [diff] [blame] | 386 | unsigned int nr_sorted; |
Jens Axboe | 0a7ae2f | 2009-05-20 08:54:31 +0200 | [diff] [blame] | 387 | unsigned int in_flight[2]; |
Bart Van Assche | 24faf6f | 2012-11-28 13:46:45 +0100 | [diff] [blame] | 388 | /* |
| 389 | * Number of active block driver functions for which blk_drain_queue() |
| 390 | * must wait. Must be incremented around functions that unlock the |
| 391 | * queue_lock internally, e.g. scsi_request_fn(). |
| 392 | */ |
| 393 | unsigned int request_fn_active; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 394 | |
Jens Axboe | 242f9dc | 2008-09-14 05:55:09 -0700 | [diff] [blame] | 395 | unsigned int rq_timeout; |
| 396 | struct timer_list timeout; |
| 397 | struct list_head timeout_list; |
| 398 | |
Tejun Heo | a612fdd | 2011-12-14 00:33:41 +0100 | [diff] [blame] | 399 | struct list_head icq_list; |
Tejun Heo | 4eef304 | 2012-03-05 13:15:18 -0800 | [diff] [blame] | 400 | #ifdef CONFIG_BLK_CGROUP |
Tejun Heo | a2b1693 | 2012-04-13 13:11:33 -0700 | [diff] [blame] | 401 | DECLARE_BITMAP (blkcg_pols, BLKCG_MAX_POLS); |
Tejun Heo | 3c79839 | 2012-04-16 13:57:25 -0700 | [diff] [blame] | 402 | struct blkcg_gq *root_blkg; |
Tejun Heo | 03aa264 | 2012-03-05 13:15:19 -0800 | [diff] [blame] | 403 | struct list_head blkg_list; |
Tejun Heo | 4eef304 | 2012-03-05 13:15:18 -0800 | [diff] [blame] | 404 | #endif |
Tejun Heo | a612fdd | 2011-12-14 00:33:41 +0100 | [diff] [blame] | 405 | |
Martin K. Petersen | 025146e | 2009-05-22 17:17:51 -0400 | [diff] [blame] | 406 | struct queue_limits limits; |
| 407 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 408 | /* |
| 409 | * sg stuff |
| 410 | */ |
| 411 | unsigned int sg_timeout; |
| 412 | unsigned int sg_reserved_size; |
Christoph Lameter | 1946089 | 2005-06-23 00:08:19 -0700 | [diff] [blame] | 413 | int node; |
Alexey Dobriyan | 6c5c934 | 2006-09-29 01:59:40 -0700 | [diff] [blame] | 414 | #ifdef CONFIG_BLK_DEV_IO_TRACE |
Jens Axboe | 2056a78 | 2006-03-23 20:00:26 +0100 | [diff] [blame] | 415 | struct blk_trace *blk_trace; |
Alexey Dobriyan | 6c5c934 | 2006-09-29 01:59:40 -0700 | [diff] [blame] | 416 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 417 | /* |
Tejun Heo | 4913efe | 2010-09-03 11:56:16 +0200 | [diff] [blame] | 418 | * for flush operations |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 419 | */ |
Tejun Heo | 4913efe | 2010-09-03 11:56:16 +0200 | [diff] [blame] | 420 | unsigned int flush_flags; |
shaohua.li@intel.com | f387693 | 2011-05-06 11:34:32 -0600 | [diff] [blame] | 421 | unsigned int flush_not_queueable:1; |
shaohua.li@intel.com | 3ac0cc4 | 2011-05-06 11:34:41 -0600 | [diff] [blame] | 422 | unsigned int flush_queue_delayed:1; |
Tejun Heo | ae1b153 | 2011-01-25 12:43:54 +0100 | [diff] [blame] | 423 | unsigned int flush_pending_idx:1; |
| 424 | unsigned int flush_running_idx:1; |
| 425 | unsigned long flush_pending_since; |
| 426 | struct list_head flush_queue[2]; |
| 427 | struct list_head flush_data_in_flight; |
Tejun Heo | dd4c133 | 2010-09-03 11:56:16 +0200 | [diff] [blame] | 428 | struct request flush_rq; |
Al Viro | 483f4af | 2006-03-18 18:34:37 -0500 | [diff] [blame] | 429 | |
| 430 | struct mutex sysfs_lock; |
FUJITA Tomonori | d351af0 | 2007-07-09 12:40:35 +0200 | [diff] [blame] | 431 | |
Tejun Heo | d732580 | 2012-03-05 13:14:58 -0800 | [diff] [blame] | 432 | int bypass_depth; |
| 433 | |
FUJITA Tomonori | d351af0 | 2007-07-09 12:40:35 +0200 | [diff] [blame] | 434 | #if defined(CONFIG_BLK_DEV_BSG) |
Mike Christie | aa387cc | 2011-07-31 22:05:09 +0200 | [diff] [blame] | 435 | bsg_job_fn *bsg_job_fn; |
| 436 | int bsg_job_size; |
FUJITA Tomonori | d351af0 | 2007-07-09 12:40:35 +0200 | [diff] [blame] | 437 | struct bsg_class_device bsg_dev; |
| 438 | #endif |
Vivek Goyal | e43473b | 2010-09-15 17:06:35 -0400 | [diff] [blame] | 439 | |
Tejun Heo | 923adde | 2012-03-05 13:15:13 -0800 | [diff] [blame] | 440 | #ifdef CONFIG_BLK_CGROUP |
| 441 | struct list_head all_q_node; |
| 442 | #endif |
Vivek Goyal | e43473b | 2010-09-15 17:06:35 -0400 | [diff] [blame] | 443 | #ifdef CONFIG_BLK_DEV_THROTTLING |
| 444 | /* Throttle data */ |
| 445 | struct throtl_data *td; |
| 446 | #endif |
Tejun Heo | 548bc8e | 2013-01-09 08:05:13 -0800 | [diff] [blame] | 447 | struct rcu_head rcu_head; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 448 | }; |
| 449 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 450 | #define QUEUE_FLAG_QUEUED 1 /* uses generic tag queueing */ |
| 451 | #define QUEUE_FLAG_STOPPED 2 /* queue is stopped */ |
Jens Axboe | 1faa16d | 2009-04-06 14:48:01 +0200 | [diff] [blame] | 452 | #define QUEUE_FLAG_SYNCFULL 3 /* read queue has been filled */ |
| 453 | #define QUEUE_FLAG_ASYNCFULL 4 /* write queue has been filled */ |
Bart Van Assche | 3f3299d | 2012-11-28 13:42:38 +0100 | [diff] [blame] | 454 | #define QUEUE_FLAG_DYING 5 /* queue being torn down */ |
Tejun Heo | d732580 | 2012-03-05 13:14:58 -0800 | [diff] [blame] | 455 | #define QUEUE_FLAG_BYPASS 6 /* act as dumb FIFO queue */ |
Jens Axboe | c21e6be | 2011-04-19 13:32:46 +0200 | [diff] [blame] | 456 | #define QUEUE_FLAG_BIDI 7 /* queue supports bidi requests */ |
| 457 | #define QUEUE_FLAG_NOMERGES 8 /* disable merge attempts */ |
Dan Williams | 5757a6d | 2011-07-23 20:44:25 +0200 | [diff] [blame] | 458 | #define QUEUE_FLAG_SAME_COMP 9 /* complete on same CPU-group */ |
Jens Axboe | c21e6be | 2011-04-19 13:32:46 +0200 | [diff] [blame] | 459 | #define QUEUE_FLAG_FAIL_IO 10 /* fake timeout */ |
| 460 | #define QUEUE_FLAG_STACKABLE 11 /* supports request stacking */ |
| 461 | #define QUEUE_FLAG_NONROT 12 /* non-rotational device (SSD) */ |
Fernando Luis Vázquez Cao | 88e740f | 2008-10-27 18:44:46 +0900 | [diff] [blame] | 462 | #define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */ |
Jens Axboe | c21e6be | 2011-04-19 13:32:46 +0200 | [diff] [blame] | 463 | #define QUEUE_FLAG_IO_STAT 13 /* do IO stats */ |
| 464 | #define QUEUE_FLAG_DISCARD 14 /* supports DISCARD */ |
| 465 | #define QUEUE_FLAG_NOXMERGES 15 /* No extended merges */ |
| 466 | #define QUEUE_FLAG_ADD_RANDOM 16 /* Contributes to random pool */ |
| 467 | #define QUEUE_FLAG_SECDISCARD 17 /* supports SECDISCARD */ |
Dan Williams | 5757a6d | 2011-07-23 20:44:25 +0200 | [diff] [blame] | 468 | #define QUEUE_FLAG_SAME_FORCE 18 /* force complete on same CPU */ |
Bart Van Assche | c246e80 | 2012-12-06 14:32:01 +0100 | [diff] [blame] | 469 | #define QUEUE_FLAG_DEAD 19 /* queue tear-down finished */ |
Jens Axboe | bc58ba9 | 2009-01-23 10:54:44 +0100 | [diff] [blame] | 470 | |
| 471 | #define QUEUE_FLAG_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \ |
Jens Axboe | 01e97f6 | 2009-09-03 20:06:47 +0200 | [diff] [blame] | 472 | (1 << QUEUE_FLAG_STACKABLE) | \ |
Jens Axboe | e2e1a14 | 2010-06-09 10:42:09 +0200 | [diff] [blame] | 473 | (1 << QUEUE_FLAG_SAME_COMP) | \ |
| 474 | (1 << QUEUE_FLAG_ADD_RANDOM)) |
Tejun Heo | 797e7db | 2006-01-06 09:51:03 +0100 | [diff] [blame] | 475 | |
Andi Kleen | 8bcb6c7 | 2012-03-30 12:33:28 +0200 | [diff] [blame] | 476 | static inline void queue_lockdep_assert_held(struct request_queue *q) |
Linus Torvalds | 8f45c1a | 2008-04-29 10:16:38 -0700 | [diff] [blame] | 477 | { |
Andi Kleen | 8bcb6c7 | 2012-03-30 12:33:28 +0200 | [diff] [blame] | 478 | if (q->queue_lock) |
| 479 | lockdep_assert_held(q->queue_lock); |
Linus Torvalds | 8f45c1a | 2008-04-29 10:16:38 -0700 | [diff] [blame] | 480 | } |
| 481 | |
Nick Piggin | 75ad23b | 2008-04-29 14:48:33 +0200 | [diff] [blame] | 482 | static inline void queue_flag_set_unlocked(unsigned int flag, |
| 483 | struct request_queue *q) |
| 484 | { |
| 485 | __set_bit(flag, &q->queue_flags); |
| 486 | } |
| 487 | |
Jens Axboe | e48ec69 | 2008-07-03 13:18:54 +0200 | [diff] [blame] | 488 | static inline int queue_flag_test_and_clear(unsigned int flag, |
| 489 | struct request_queue *q) |
| 490 | { |
Andi Kleen | 8bcb6c7 | 2012-03-30 12:33:28 +0200 | [diff] [blame] | 491 | queue_lockdep_assert_held(q); |
Jens Axboe | e48ec69 | 2008-07-03 13:18:54 +0200 | [diff] [blame] | 492 | |
| 493 | if (test_bit(flag, &q->queue_flags)) { |
| 494 | __clear_bit(flag, &q->queue_flags); |
| 495 | return 1; |
| 496 | } |
| 497 | |
| 498 | return 0; |
| 499 | } |
| 500 | |
| 501 | static inline int queue_flag_test_and_set(unsigned int flag, |
| 502 | struct request_queue *q) |
| 503 | { |
Andi Kleen | 8bcb6c7 | 2012-03-30 12:33:28 +0200 | [diff] [blame] | 504 | queue_lockdep_assert_held(q); |
Jens Axboe | e48ec69 | 2008-07-03 13:18:54 +0200 | [diff] [blame] | 505 | |
| 506 | if (!test_bit(flag, &q->queue_flags)) { |
| 507 | __set_bit(flag, &q->queue_flags); |
| 508 | return 0; |
| 509 | } |
| 510 | |
| 511 | return 1; |
| 512 | } |
| 513 | |
Nick Piggin | 75ad23b | 2008-04-29 14:48:33 +0200 | [diff] [blame] | 514 | static inline void queue_flag_set(unsigned int flag, struct request_queue *q) |
| 515 | { |
Andi Kleen | 8bcb6c7 | 2012-03-30 12:33:28 +0200 | [diff] [blame] | 516 | queue_lockdep_assert_held(q); |
Nick Piggin | 75ad23b | 2008-04-29 14:48:33 +0200 | [diff] [blame] | 517 | __set_bit(flag, &q->queue_flags); |
| 518 | } |
| 519 | |
| 520 | static inline void queue_flag_clear_unlocked(unsigned int flag, |
| 521 | struct request_queue *q) |
| 522 | { |
| 523 | __clear_bit(flag, &q->queue_flags); |
| 524 | } |
| 525 | |
Jens Axboe | 0a7ae2f | 2009-05-20 08:54:31 +0200 | [diff] [blame] | 526 | static inline int queue_in_flight(struct request_queue *q) |
| 527 | { |
| 528 | return q->in_flight[0] + q->in_flight[1]; |
| 529 | } |
| 530 | |
Nick Piggin | 75ad23b | 2008-04-29 14:48:33 +0200 | [diff] [blame] | 531 | static inline void queue_flag_clear(unsigned int flag, struct request_queue *q) |
| 532 | { |
Andi Kleen | 8bcb6c7 | 2012-03-30 12:33:28 +0200 | [diff] [blame] | 533 | queue_lockdep_assert_held(q); |
Nick Piggin | 75ad23b | 2008-04-29 14:48:33 +0200 | [diff] [blame] | 534 | __clear_bit(flag, &q->queue_flags); |
| 535 | } |
| 536 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 537 | #define blk_queue_tagged(q) test_bit(QUEUE_FLAG_QUEUED, &(q)->queue_flags) |
| 538 | #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] | 539 | #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] | 540 | #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] | 541 | #define blk_queue_bypass(q) test_bit(QUEUE_FLAG_BYPASS, &(q)->queue_flags) |
Alan D. Brunelle | ac9fafa | 2008-04-29 14:44:19 +0200 | [diff] [blame] | 542 | #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] | 543 | #define blk_queue_noxmerges(q) \ |
| 544 | test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags) |
Jens Axboe | a68bbdd | 2008-09-24 13:03:33 +0200 | [diff] [blame] | 545 | #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] | 546 | #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] | 547 | #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] | 548 | #define blk_queue_stackable(q) \ |
| 549 | test_bit(QUEUE_FLAG_STACKABLE, &(q)->queue_flags) |
Christoph Hellwig | c15227d | 2009-09-30 13:52:12 +0200 | [diff] [blame] | 550 | #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] | 551 | #define blk_queue_secdiscard(q) (blk_queue_discard(q) && \ |
| 552 | test_bit(QUEUE_FLAG_SECDISCARD, &(q)->queue_flags)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 553 | |
Christoph Hellwig | 33659eb | 2010-08-07 18:17:56 +0200 | [diff] [blame] | 554 | #define blk_noretry_request(rq) \ |
| 555 | ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \ |
| 556 | REQ_FAILFAST_DRIVER)) |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 557 | |
Christoph Hellwig | 33659eb | 2010-08-07 18:17:56 +0200 | [diff] [blame] | 558 | #define blk_account_rq(rq) \ |
| 559 | (((rq)->cmd_flags & REQ_STARTED) && \ |
Martin K. Petersen | e2a60da | 2012-09-18 12:19:25 -0400 | [diff] [blame] | 560 | ((rq)->cmd_type == REQ_TYPE_FS)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 561 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 562 | #define blk_pm_request(rq) \ |
Christoph Hellwig | 33659eb | 2010-08-07 18:17:56 +0200 | [diff] [blame] | 563 | ((rq)->cmd_type == REQ_TYPE_PM_SUSPEND || \ |
| 564 | (rq)->cmd_type == REQ_TYPE_PM_RESUME) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 565 | |
Jens Axboe | ab780f1 | 2008-08-26 10:25:02 +0200 | [diff] [blame] | 566 | #define blk_rq_cpu_valid(rq) ((rq)->cpu != -1) |
FUJITA Tomonori | abae1fd | 2007-07-16 08:52:14 +0200 | [diff] [blame] | 567 | #define blk_bidi_rq(rq) ((rq)->next_rq != NULL) |
Kiyoshi Ueda | 336cdb4 | 2007-12-11 17:40:30 -0500 | [diff] [blame] | 568 | /* rq->queuelist of dequeued request must be list_empty() */ |
| 569 | #define blk_queued_rq(rq) (!list_empty(&(rq)->queuelist)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 570 | |
| 571 | #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist) |
| 572 | |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 573 | #define rq_data_dir(rq) ((rq)->cmd_flags & 1) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 574 | |
Martin K. Petersen | e692cb6 | 2010-12-01 19:41:49 +0100 | [diff] [blame] | 575 | static inline unsigned int blk_queue_cluster(struct request_queue *q) |
| 576 | { |
| 577 | return q->limits.cluster; |
| 578 | } |
| 579 | |
Jens Axboe | 9e2585a | 2006-07-28 09:26:13 +0200 | [diff] [blame] | 580 | /* |
Jens Axboe | 1faa16d | 2009-04-06 14:48:01 +0200 | [diff] [blame] | 581 | * 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] | 582 | */ |
Jens Axboe | 1faa16d | 2009-04-06 14:48:01 +0200 | [diff] [blame] | 583 | static inline bool rw_is_sync(unsigned int rw_flags) |
| 584 | { |
Christoph Hellwig | 7b6d91d | 2010-08-07 18:20:39 +0200 | [diff] [blame] | 585 | return !(rw_flags & REQ_WRITE) || (rw_flags & REQ_SYNC); |
Jens Axboe | 1faa16d | 2009-04-06 14:48:01 +0200 | [diff] [blame] | 586 | } |
| 587 | |
| 588 | static inline bool rq_is_sync(struct request *rq) |
| 589 | { |
| 590 | return rw_is_sync(rq->cmd_flags); |
| 591 | } |
| 592 | |
Tejun Heo | 5b788ce | 2012-06-04 20:40:59 -0700 | [diff] [blame] | 593 | static inline bool blk_rl_full(struct request_list *rl, bool sync) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 594 | { |
Tejun Heo | 5b788ce | 2012-06-04 20:40:59 -0700 | [diff] [blame] | 595 | unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL; |
| 596 | |
| 597 | return rl->flags & flag; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 598 | } |
| 599 | |
Tejun Heo | 5b788ce | 2012-06-04 20:40:59 -0700 | [diff] [blame] | 600 | 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] | 601 | { |
Tejun Heo | 5b788ce | 2012-06-04 20:40:59 -0700 | [diff] [blame] | 602 | unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL; |
| 603 | |
| 604 | rl->flags |= flag; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 605 | } |
| 606 | |
Tejun Heo | 5b788ce | 2012-06-04 20:40:59 -0700 | [diff] [blame] | 607 | 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] | 608 | { |
Tejun Heo | 5b788ce | 2012-06-04 20:40:59 -0700 | [diff] [blame] | 609 | unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL; |
| 610 | |
| 611 | rl->flags &= ~flag; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 612 | } |
| 613 | |
Martin K. Petersen | e2a60da | 2012-09-18 12:19:25 -0400 | [diff] [blame] | 614 | static inline bool rq_mergeable(struct request *rq) |
| 615 | { |
| 616 | if (rq->cmd_type != REQ_TYPE_FS) |
| 617 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 618 | |
Martin K. Petersen | e2a60da | 2012-09-18 12:19:25 -0400 | [diff] [blame] | 619 | if (rq->cmd_flags & REQ_NOMERGE_FLAGS) |
| 620 | return false; |
| 621 | |
| 622 | return true; |
| 623 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 624 | |
Martin K. Petersen | f31dc1c | 2012-09-18 12:19:26 -0400 | [diff] [blame] | 625 | static inline bool blk_check_merge_flags(unsigned int flags1, |
| 626 | unsigned int flags2) |
| 627 | { |
| 628 | if ((flags1 & REQ_DISCARD) != (flags2 & REQ_DISCARD)) |
| 629 | return false; |
| 630 | |
| 631 | if ((flags1 & REQ_SECURE) != (flags2 & REQ_SECURE)) |
| 632 | return false; |
| 633 | |
Martin K. Petersen | 4363ac7 | 2012-09-18 12:19:27 -0400 | [diff] [blame] | 634 | if ((flags1 & REQ_WRITE_SAME) != (flags2 & REQ_WRITE_SAME)) |
| 635 | return false; |
| 636 | |
Martin K. Petersen | f31dc1c | 2012-09-18 12:19:26 -0400 | [diff] [blame] | 637 | return true; |
| 638 | } |
| 639 | |
Martin K. Petersen | 4363ac7 | 2012-09-18 12:19:27 -0400 | [diff] [blame] | 640 | static inline bool blk_write_same_mergeable(struct bio *a, struct bio *b) |
| 641 | { |
| 642 | if (bio_data(a) == bio_data(b)) |
| 643 | return true; |
| 644 | |
| 645 | return false; |
| 646 | } |
| 647 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 648 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 649 | * q->prep_rq_fn return values |
| 650 | */ |
| 651 | #define BLKPREP_OK 0 /* serve it */ |
| 652 | #define BLKPREP_KILL 1 /* fatal error, kill */ |
| 653 | #define BLKPREP_DEFER 2 /* leave on queue */ |
| 654 | |
| 655 | extern unsigned long blk_max_low_pfn, blk_max_pfn; |
| 656 | |
| 657 | /* |
| 658 | * standard bounce addresses: |
| 659 | * |
| 660 | * BLK_BOUNCE_HIGH : bounce all highmem pages |
| 661 | * BLK_BOUNCE_ANY : don't bounce anything |
| 662 | * BLK_BOUNCE_ISA : bounce pages above ISA DMA boundary |
| 663 | */ |
Andi Kleen | 2472892 | 2008-04-21 09:51:05 +0200 | [diff] [blame] | 664 | |
| 665 | #if BITS_PER_LONG == 32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 666 | #define BLK_BOUNCE_HIGH ((u64)blk_max_low_pfn << PAGE_SHIFT) |
Andi Kleen | 2472892 | 2008-04-21 09:51:05 +0200 | [diff] [blame] | 667 | #else |
| 668 | #define BLK_BOUNCE_HIGH -1ULL |
| 669 | #endif |
| 670 | #define BLK_BOUNCE_ANY (-1ULL) |
FUJITA Tomonori | bfe1723 | 2010-05-31 15:59:03 +0900 | [diff] [blame] | 671 | #define BLK_BOUNCE_ISA (DMA_BIT_MASK(24)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 672 | |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 673 | /* |
| 674 | * default timeout for SG_IO if none specified |
| 675 | */ |
| 676 | #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ) |
Linus Torvalds | f2f1fa7 | 2008-12-05 14:49:18 -0800 | [diff] [blame] | 677 | #define BLK_MIN_SG_TIMEOUT (7 * HZ) |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 678 | |
Christoph Lameter | 2a7326b | 2007-07-17 04:03:37 -0700 | [diff] [blame] | 679 | #ifdef CONFIG_BOUNCE |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 680 | extern int init_emergency_isa_pool(void); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 681 | extern void blk_queue_bounce(struct request_queue *q, struct bio **bio); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 682 | #else |
| 683 | static inline int init_emergency_isa_pool(void) |
| 684 | { |
| 685 | return 0; |
| 686 | } |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 687 | 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] | 688 | { |
| 689 | } |
| 690 | #endif /* CONFIG_MMU */ |
| 691 | |
FUJITA Tomonori | 152e283 | 2008-08-28 16:17:06 +0900 | [diff] [blame] | 692 | struct rq_map_data { |
| 693 | struct page **pages; |
| 694 | int page_order; |
| 695 | int nr_entries; |
FUJITA Tomonori | 56c451f | 2008-12-18 14:49:37 +0900 | [diff] [blame] | 696 | unsigned long offset; |
FUJITA Tomonori | 97ae77a | 2008-12-18 14:49:38 +0900 | [diff] [blame] | 697 | int null_mapped; |
FUJITA Tomonori | ecb554a | 2009-07-09 14:46:53 +0200 | [diff] [blame] | 698 | int from_user; |
FUJITA Tomonori | 152e283 | 2008-08-28 16:17:06 +0900 | [diff] [blame] | 699 | }; |
| 700 | |
NeilBrown | 5705f70 | 2007-09-25 12:35:59 +0200 | [diff] [blame] | 701 | struct req_iterator { |
| 702 | int i; |
| 703 | struct bio *bio; |
| 704 | }; |
| 705 | |
| 706 | /* This should not be used directly - use rq_for_each_segment */ |
Jens Axboe | 1e42807 | 2009-02-23 09:03:10 +0100 | [diff] [blame] | 707 | #define for_each_bio(_bio) \ |
| 708 | for (; _bio; _bio = _bio->bi_next) |
NeilBrown | 5705f70 | 2007-09-25 12:35:59 +0200 | [diff] [blame] | 709 | #define __rq_for_each_bio(_bio, rq) \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 710 | if ((rq->bio)) \ |
| 711 | for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next) |
| 712 | |
NeilBrown | 5705f70 | 2007-09-25 12:35:59 +0200 | [diff] [blame] | 713 | #define rq_for_each_segment(bvl, _rq, _iter) \ |
| 714 | __rq_for_each_bio(_iter.bio, _rq) \ |
| 715 | bio_for_each_segment(bvl, _iter.bio, _iter.i) |
| 716 | |
| 717 | #define rq_iter_last(rq, _iter) \ |
| 718 | (_iter.bio->bi_next == NULL && _iter.i == _iter.bio->bi_vcnt-1) |
| 719 | |
Ilya Loginov | 2d4dc89 | 2009-11-26 09:16:19 +0100 | [diff] [blame] | 720 | #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE |
| 721 | # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform" |
| 722 | #endif |
| 723 | #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE |
| 724 | extern void rq_flush_dcache_pages(struct request *rq); |
| 725 | #else |
| 726 | static inline void rq_flush_dcache_pages(struct request *rq) |
| 727 | { |
| 728 | } |
| 729 | #endif |
| 730 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 731 | extern int blk_register_queue(struct gendisk *disk); |
| 732 | extern void blk_unregister_queue(struct gendisk *disk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 733 | extern void generic_make_request(struct bio *bio); |
FUJITA Tomonori | 2a4aa30 | 2008-04-29 09:54:36 +0200 | [diff] [blame] | 734 | extern void blk_rq_init(struct request_queue *q, struct request *rq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 735 | extern void blk_put_request(struct request *); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 736 | extern void __blk_put_request(struct request_queue *, struct request *); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 737 | extern struct request *blk_get_request(struct request_queue *, int, gfp_t); |
Boaz Harrosh | 79eb63e | 2009-05-17 18:57:15 +0300 | [diff] [blame] | 738 | extern struct request *blk_make_request(struct request_queue *, struct bio *, |
| 739 | gfp_t); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 740 | extern void blk_requeue_request(struct request_queue *, struct request *); |
Christoph Hellwig | 66ac028 | 2010-06-18 16:59:42 +0200 | [diff] [blame] | 741 | extern void blk_add_request_payload(struct request *rq, struct page *page, |
| 742 | unsigned int len); |
Kiyoshi Ueda | 82124d6 | 2008-09-18 10:45:38 -0400 | [diff] [blame] | 743 | 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] | 744 | extern int blk_lld_busy(struct request_queue *q); |
Kiyoshi Ueda | b0fd271 | 2009-06-11 13:10:16 +0200 | [diff] [blame] | 745 | extern int blk_rq_prep_clone(struct request *rq, struct request *rq_src, |
| 746 | struct bio_set *bs, gfp_t gfp_mask, |
| 747 | int (*bio_ctr)(struct bio *, struct bio *, void *), |
| 748 | void *data); |
| 749 | extern void blk_rq_unprep_clone(struct request *rq); |
Kiyoshi Ueda | 82124d6 | 2008-09-18 10:45:38 -0400 | [diff] [blame] | 750 | extern int blk_insert_cloned_request(struct request_queue *q, |
| 751 | struct request *rq); |
Jens Axboe | 3cca6dc | 2011-03-02 11:08:00 -0500 | [diff] [blame] | 752 | extern void blk_delay_queue(struct request_queue *, unsigned long); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 753 | extern void blk_recount_segments(struct request_queue *, struct bio *); |
Paolo Bonzini | 0bfc96c | 2012-01-12 16:01:28 +0100 | [diff] [blame] | 754 | extern int scsi_verify_blk_ioctl(struct block_device *, unsigned int); |
Paolo Bonzini | 577ebb3 | 2012-01-12 16:01:27 +0100 | [diff] [blame] | 755 | extern int scsi_cmd_blk_ioctl(struct block_device *, fmode_t, |
| 756 | unsigned int, void __user *); |
Al Viro | 74f3c8a | 2007-08-27 15:38:10 -0400 | [diff] [blame] | 757 | extern int scsi_cmd_ioctl(struct request_queue *, struct gendisk *, fmode_t, |
| 758 | unsigned int, void __user *); |
Al Viro | e915e87 | 2008-09-02 17:16:41 -0400 | [diff] [blame] | 759 | extern int sg_scsi_ioctl(struct request_queue *, struct gendisk *, fmode_t, |
| 760 | struct scsi_ioctl_command __user *); |
Andrew Morton | 3fcfab1 | 2006-10-19 23:28:16 -0700 | [diff] [blame] | 761 | |
Christoph Hellwig | 5a7bbad | 2011-09-12 12:12:01 +0200 | [diff] [blame] | 762 | extern void blk_queue_bio(struct request_queue *q, struct bio *bio); |
Christoph Hellwig | 166e1f9 | 2011-09-12 12:08:27 +0200 | [diff] [blame] | 763 | |
Andrew Morton | 3fcfab1 | 2006-10-19 23:28:16 -0700 | [diff] [blame] | 764 | /* |
| 765 | * A queue has just exitted congestion. Note this in the global counter of |
| 766 | * congested queues, and wake up anyone who was waiting for requests to be |
| 767 | * put back. |
| 768 | */ |
Jens Axboe | 8aa7e84 | 2009-07-09 14:52:32 +0200 | [diff] [blame] | 769 | 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] | 770 | { |
Jens Axboe | 8aa7e84 | 2009-07-09 14:52:32 +0200 | [diff] [blame] | 771 | clear_bdi_congested(&q->backing_dev_info, sync); |
Andrew Morton | 3fcfab1 | 2006-10-19 23:28:16 -0700 | [diff] [blame] | 772 | } |
| 773 | |
| 774 | /* |
| 775 | * A queue has just entered congestion. Flag that in the queue's VM-visible |
| 776 | * state flags and increment the global gounter of congested queues. |
| 777 | */ |
Jens Axboe | 8aa7e84 | 2009-07-09 14:52:32 +0200 | [diff] [blame] | 778 | 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] | 779 | { |
Jens Axboe | 8aa7e84 | 2009-07-09 14:52:32 +0200 | [diff] [blame] | 780 | set_bdi_congested(&q->backing_dev_info, sync); |
Andrew Morton | 3fcfab1 | 2006-10-19 23:28:16 -0700 | [diff] [blame] | 781 | } |
| 782 | |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 783 | extern void blk_start_queue(struct request_queue *q); |
| 784 | extern void blk_stop_queue(struct request_queue *q); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 785 | extern void blk_sync_queue(struct request_queue *q); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 786 | extern void __blk_stop_queue(struct request_queue *q); |
Christoph Hellwig | 24ecfbe | 2011-04-18 11:41:33 +0200 | [diff] [blame] | 787 | extern void __blk_run_queue(struct request_queue *q); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 788 | extern void blk_run_queue(struct request_queue *); |
Jens Axboe | c21e6be | 2011-04-19 13:32:46 +0200 | [diff] [blame] | 789 | extern void blk_run_queue_async(struct request_queue *q); |
FUJITA Tomonori | a3bce90 | 2008-08-28 16:17:05 +0900 | [diff] [blame] | 790 | extern int blk_rq_map_user(struct request_queue *, struct request *, |
FUJITA Tomonori | 152e283 | 2008-08-28 16:17:06 +0900 | [diff] [blame] | 791 | struct rq_map_data *, void __user *, unsigned long, |
| 792 | gfp_t); |
Jens Axboe | 8e5cfc4 | 2006-12-19 11:12:46 +0100 | [diff] [blame] | 793 | extern int blk_rq_unmap_user(struct bio *); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 794 | extern int blk_rq_map_kern(struct request_queue *, struct request *, void *, unsigned int, gfp_t); |
| 795 | extern int blk_rq_map_user_iov(struct request_queue *, struct request *, |
FUJITA Tomonori | 152e283 | 2008-08-28 16:17:06 +0900 | [diff] [blame] | 796 | struct rq_map_data *, struct sg_iovec *, int, |
| 797 | unsigned int, gfp_t); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 798 | extern int blk_execute_rq(struct request_queue *, struct gendisk *, |
James Bottomley | 994ca9a | 2005-06-20 14:11:09 +0200 | [diff] [blame] | 799 | struct request *, int); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 800 | extern void blk_execute_rq_nowait(struct request_queue *, struct gendisk *, |
Jens Axboe | 15fc858 | 2006-01-06 10:00:50 +0100 | [diff] [blame] | 801 | struct request *, int, rq_end_io_fn *); |
Mike Christie | 6e39b69e | 2005-11-11 05:30:24 -0600 | [diff] [blame] | 802 | |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 803 | static inline struct request_queue *bdev_get_queue(struct block_device *bdev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 804 | { |
| 805 | return bdev->bd_disk->queue; |
| 806 | } |
| 807 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 808 | /* |
Tejun Heo | 80a761f | 2009-07-03 17:48:17 +0900 | [diff] [blame] | 809 | * blk_rq_pos() : the current sector |
| 810 | * blk_rq_bytes() : bytes left in the entire request |
| 811 | * blk_rq_cur_bytes() : bytes left in the current segment |
| 812 | * blk_rq_err_bytes() : bytes left till the next error boundary |
| 813 | * blk_rq_sectors() : sectors left in the entire request |
| 814 | * blk_rq_cur_sectors() : sectors left in the current segment |
Tejun Heo | 5efccd1 | 2009-04-23 11:05:18 +0900 | [diff] [blame] | 815 | */ |
Tejun Heo | 5b93629 | 2009-05-07 22:24:38 +0900 | [diff] [blame] | 816 | static inline sector_t blk_rq_pos(const struct request *rq) |
| 817 | { |
Tejun Heo | a2dec7b | 2009-05-07 22:24:44 +0900 | [diff] [blame] | 818 | return rq->__sector; |
Tejun Heo | 5b93629 | 2009-05-07 22:24:38 +0900 | [diff] [blame] | 819 | } |
| 820 | |
Tejun Heo | 2e46e8b | 2009-05-07 22:24:41 +0900 | [diff] [blame] | 821 | static inline unsigned int blk_rq_bytes(const struct request *rq) |
| 822 | { |
Tejun Heo | a2dec7b | 2009-05-07 22:24:44 +0900 | [diff] [blame] | 823 | return rq->__data_len; |
Tejun Heo | 2e46e8b | 2009-05-07 22:24:41 +0900 | [diff] [blame] | 824 | } |
| 825 | |
| 826 | static inline int blk_rq_cur_bytes(const struct request *rq) |
| 827 | { |
| 828 | return rq->bio ? bio_cur_bytes(rq->bio) : 0; |
| 829 | } |
Tejun Heo | 5efccd1 | 2009-04-23 11:05:18 +0900 | [diff] [blame] | 830 | |
Tejun Heo | 80a761f | 2009-07-03 17:48:17 +0900 | [diff] [blame] | 831 | extern unsigned int blk_rq_err_bytes(const struct request *rq); |
| 832 | |
Tejun Heo | 5b93629 | 2009-05-07 22:24:38 +0900 | [diff] [blame] | 833 | static inline unsigned int blk_rq_sectors(const struct request *rq) |
| 834 | { |
Tejun Heo | 2e46e8b | 2009-05-07 22:24:41 +0900 | [diff] [blame] | 835 | return blk_rq_bytes(rq) >> 9; |
Tejun Heo | 5b93629 | 2009-05-07 22:24:38 +0900 | [diff] [blame] | 836 | } |
| 837 | |
| 838 | static inline unsigned int blk_rq_cur_sectors(const struct request *rq) |
| 839 | { |
Tejun Heo | 2e46e8b | 2009-05-07 22:24:41 +0900 | [diff] [blame] | 840 | return blk_rq_cur_bytes(rq) >> 9; |
Tejun Heo | 5b93629 | 2009-05-07 22:24:38 +0900 | [diff] [blame] | 841 | } |
| 842 | |
Martin K. Petersen | f31dc1c | 2012-09-18 12:19:26 -0400 | [diff] [blame] | 843 | static inline unsigned int blk_queue_get_max_sectors(struct request_queue *q, |
| 844 | unsigned int cmd_flags) |
| 845 | { |
| 846 | if (unlikely(cmd_flags & REQ_DISCARD)) |
James Bottomley | 871dd92 | 2013-04-24 08:52:50 -0600 | [diff] [blame] | 847 | return min(q->limits.max_discard_sectors, UINT_MAX >> 9); |
Martin K. Petersen | f31dc1c | 2012-09-18 12:19:26 -0400 | [diff] [blame] | 848 | |
Martin K. Petersen | 4363ac7 | 2012-09-18 12:19:27 -0400 | [diff] [blame] | 849 | if (unlikely(cmd_flags & REQ_WRITE_SAME)) |
| 850 | return q->limits.max_write_same_sectors; |
| 851 | |
Martin K. Petersen | f31dc1c | 2012-09-18 12:19:26 -0400 | [diff] [blame] | 852 | return q->limits.max_sectors; |
| 853 | } |
| 854 | |
| 855 | static inline unsigned int blk_rq_get_max_sectors(struct request *rq) |
| 856 | { |
| 857 | struct request_queue *q = rq->q; |
| 858 | |
| 859 | if (unlikely(rq->cmd_type == REQ_TYPE_BLOCK_PC)) |
| 860 | return q->limits.max_hw_sectors; |
| 861 | |
| 862 | return blk_queue_get_max_sectors(q, rq->cmd_flags); |
| 863 | } |
| 864 | |
Tejun Heo | 5efccd1 | 2009-04-23 11:05:18 +0900 | [diff] [blame] | 865 | /* |
Tejun Heo | 9934c8c | 2009-05-08 11:54:16 +0900 | [diff] [blame] | 866 | * Request issue related functions. |
| 867 | */ |
| 868 | extern struct request *blk_peek_request(struct request_queue *q); |
| 869 | extern void blk_start_request(struct request *rq); |
| 870 | extern struct request *blk_fetch_request(struct request_queue *q); |
| 871 | |
| 872 | /* |
Tejun Heo | 2e60e02 | 2009-04-23 11:05:18 +0900 | [diff] [blame] | 873 | * Request completion related functions. |
| 874 | * |
| 875 | * blk_update_request() completes given number of bytes and updates |
| 876 | * the request without completing it. |
| 877 | * |
Tejun Heo | f06d9a2 | 2009-04-23 11:05:19 +0900 | [diff] [blame] | 878 | * blk_end_request() and friends. __blk_end_request() must be called |
| 879 | * with the request queue spinlock acquired. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 880 | * |
| 881 | * Several drivers define their own end_request and call |
Kiyoshi Ueda | 3bcddea | 2007-12-11 17:52:28 -0500 | [diff] [blame] | 882 | * blk_end_request() for parts of the original function. |
| 883 | * This prevents code duplication in drivers. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 884 | */ |
Tejun Heo | 2e60e02 | 2009-04-23 11:05:18 +0900 | [diff] [blame] | 885 | extern bool blk_update_request(struct request *rq, int error, |
| 886 | unsigned int nr_bytes); |
FUJITA Tomonori | b1f7449 | 2009-05-11 17:56:09 +0900 | [diff] [blame] | 887 | extern bool blk_end_request(struct request *rq, int error, |
| 888 | unsigned int nr_bytes); |
| 889 | extern void blk_end_request_all(struct request *rq, int error); |
| 890 | extern bool blk_end_request_cur(struct request *rq, int error); |
Tejun Heo | 80a761f | 2009-07-03 17:48:17 +0900 | [diff] [blame] | 891 | extern bool blk_end_request_err(struct request *rq, int error); |
FUJITA Tomonori | b1f7449 | 2009-05-11 17:56:09 +0900 | [diff] [blame] | 892 | extern bool __blk_end_request(struct request *rq, int error, |
| 893 | unsigned int nr_bytes); |
| 894 | extern void __blk_end_request_all(struct request *rq, int error); |
| 895 | extern bool __blk_end_request_cur(struct request *rq, int error); |
Tejun Heo | 80a761f | 2009-07-03 17:48:17 +0900 | [diff] [blame] | 896 | extern bool __blk_end_request_err(struct request *rq, int error); |
Tejun Heo | 2e60e02 | 2009-04-23 11:05:18 +0900 | [diff] [blame] | 897 | |
Jens Axboe | ff856ba | 2006-01-09 16:02:34 +0100 | [diff] [blame] | 898 | extern void blk_complete_request(struct request *); |
Jens Axboe | 242f9dc | 2008-09-14 05:55:09 -0700 | [diff] [blame] | 899 | extern void __blk_complete_request(struct request *); |
| 900 | extern void blk_abort_request(struct request *); |
James Bottomley | 28018c2 | 2010-07-01 19:49:17 +0900 | [diff] [blame] | 901 | extern void blk_unprep_request(struct request *); |
Jens Axboe | ff856ba | 2006-01-09 16:02:34 +0100 | [diff] [blame] | 902 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 903 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 904 | * Access functions for manipulating queue properties |
| 905 | */ |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 906 | extern struct request_queue *blk_init_queue_node(request_fn_proc *rfn, |
Christoph Lameter | 1946089 | 2005-06-23 00:08:19 -0700 | [diff] [blame] | 907 | spinlock_t *lock, int node_id); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 908 | extern struct request_queue *blk_init_queue(request_fn_proc *, spinlock_t *); |
Mike Snitzer | 01effb0 | 2010-05-11 08:57:42 +0200 | [diff] [blame] | 909 | extern struct request_queue *blk_init_allocated_queue(struct request_queue *, |
| 910 | request_fn_proc *, spinlock_t *); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 911 | extern void blk_cleanup_queue(struct request_queue *); |
| 912 | extern void blk_queue_make_request(struct request_queue *, make_request_fn *); |
| 913 | extern void blk_queue_bounce_limit(struct request_queue *, u64); |
Mike Snitzer | 72d4cd9 | 2010-12-17 08:34:20 +0100 | [diff] [blame] | 914 | 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] | 915 | extern void blk_queue_max_hw_sectors(struct request_queue *, unsigned int); |
Martin K. Petersen | 8a78362 | 2010-02-26 00:20:39 -0500 | [diff] [blame] | 916 | extern void blk_queue_max_segments(struct request_queue *, unsigned short); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 917 | extern void blk_queue_max_segment_size(struct request_queue *, unsigned int); |
Christoph Hellwig | 67efc92 | 2009-09-30 13:54:20 +0200 | [diff] [blame] | 918 | extern void blk_queue_max_discard_sectors(struct request_queue *q, |
| 919 | unsigned int max_discard_sectors); |
Martin K. Petersen | 4363ac7 | 2012-09-18 12:19:27 -0400 | [diff] [blame] | 920 | extern void blk_queue_max_write_same_sectors(struct request_queue *q, |
| 921 | unsigned int max_write_same_sectors); |
Martin K. Petersen | e1defc4 | 2009-05-22 17:17:49 -0400 | [diff] [blame] | 922 | 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] | 923 | 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] | 924 | extern void blk_queue_alignment_offset(struct request_queue *q, |
| 925 | unsigned int alignment); |
Martin K. Petersen | 7c958e3 | 2009-07-31 11:49:11 -0400 | [diff] [blame] | 926 | 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] | 927 | 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] | 928 | 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] | 929 | 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] | 930 | extern void blk_set_default_limits(struct queue_limits *lim); |
Martin K. Petersen | b1bd055 | 2012-01-11 16:27:11 +0100 | [diff] [blame] | 931 | extern void blk_set_stacking_limits(struct queue_limits *lim); |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 932 | extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b, |
| 933 | sector_t offset); |
Martin K. Petersen | 17be8c2 | 2010-01-11 03:21:49 -0500 | [diff] [blame] | 934 | extern int bdev_stack_limits(struct queue_limits *t, struct block_device *bdev, |
| 935 | sector_t offset); |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 936 | extern void disk_stack_limits(struct gendisk *disk, struct block_device *bdev, |
| 937 | sector_t offset); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 938 | 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] | 939 | extern void blk_queue_dma_pad(struct request_queue *, unsigned int); |
FUJITA Tomonori | 27f8221 | 2008-07-04 09:30:03 +0200 | [diff] [blame] | 940 | extern void blk_queue_update_dma_pad(struct request_queue *, unsigned int); |
Tejun Heo | 2fb98e8 | 2008-02-19 11:36:53 +0100 | [diff] [blame] | 941 | extern int blk_queue_dma_drain(struct request_queue *q, |
| 942 | dma_drain_needed_fn *dma_drain_needed, |
| 943 | void *buf, unsigned int size); |
Kiyoshi Ueda | ef9e3fa | 2008-10-01 16:12:15 +0200 | [diff] [blame] | 944 | 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] | 945 | extern void blk_queue_segment_boundary(struct request_queue *, unsigned long); |
| 946 | 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] | 947 | 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] | 948 | extern void blk_queue_merge_bvec(struct request_queue *, merge_bvec_fn *); |
| 949 | extern void blk_queue_dma_alignment(struct request_queue *, int); |
James Bottomley | 11c3e68 | 2007-12-31 16:37:00 -0600 | [diff] [blame] | 950 | extern void blk_queue_update_dma_alignment(struct request_queue *, int); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 951 | extern void blk_queue_softirq_done(struct request_queue *, softirq_done_fn *); |
Jens Axboe | 242f9dc | 2008-09-14 05:55:09 -0700 | [diff] [blame] | 952 | extern void blk_queue_rq_timed_out(struct request_queue *, rq_timed_out_fn *); |
| 953 | extern void blk_queue_rq_timeout(struct request_queue *, unsigned int); |
Tejun Heo | 4913efe | 2010-09-03 11:56:16 +0200 | [diff] [blame] | 954 | 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] | 955 | extern void blk_queue_flush_queueable(struct request_queue *q, bool queueable); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 956 | 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] | 957 | |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 958 | 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] | 959 | extern int blk_bio_map_sg(struct request_queue *q, struct bio *bio, |
| 960 | struct scatterlist *sglist); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 961 | extern void blk_dump_rq_flags(struct request *, char *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 962 | extern long nr_blockdev_pages(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 963 | |
Tejun Heo | 09ac46c | 2011-12-14 00:33:38 +0100 | [diff] [blame] | 964 | bool __must_check blk_get_queue(struct request_queue *); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 965 | struct request_queue *blk_alloc_queue(gfp_t); |
| 966 | struct request_queue *blk_alloc_queue_node(gfp_t, int); |
| 967 | extern void blk_put_queue(struct request_queue *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 968 | |
Shaohua Li | 316cc67 | 2011-07-08 08:19:21 +0200 | [diff] [blame] | 969 | /* |
Lin Ming | 6c95466 | 2013-03-23 11:42:26 +0800 | [diff] [blame] | 970 | * block layer runtime pm functions |
| 971 | */ |
| 972 | #ifdef CONFIG_PM_RUNTIME |
| 973 | extern void blk_pm_runtime_init(struct request_queue *q, struct device *dev); |
| 974 | extern int blk_pre_runtime_suspend(struct request_queue *q); |
| 975 | extern void blk_post_runtime_suspend(struct request_queue *q, int err); |
| 976 | extern void blk_pre_runtime_resume(struct request_queue *q); |
| 977 | extern void blk_post_runtime_resume(struct request_queue *q, int err); |
| 978 | #else |
| 979 | static inline void blk_pm_runtime_init(struct request_queue *q, |
| 980 | struct device *dev) {} |
| 981 | static inline int blk_pre_runtime_suspend(struct request_queue *q) |
| 982 | { |
| 983 | return -ENOSYS; |
| 984 | } |
| 985 | static inline void blk_post_runtime_suspend(struct request_queue *q, int err) {} |
| 986 | static inline void blk_pre_runtime_resume(struct request_queue *q) {} |
| 987 | static inline void blk_post_runtime_resume(struct request_queue *q, int err) {} |
| 988 | #endif |
| 989 | |
| 990 | /* |
Suresh Jayaraman | 75df713 | 2011-09-21 10:00:16 +0200 | [diff] [blame] | 991 | * blk_plug permits building a queue of related requests by holding the I/O |
| 992 | * fragments for a short period. This allows merging of sequential requests |
| 993 | * into single larger request. As the requests are moved from a per-task list to |
| 994 | * the device's request_queue in a batch, this results in improved scalability |
| 995 | * as the lock contention for request_queue lock is reduced. |
| 996 | * |
| 997 | * It is ok not to disable preemption when adding the request to the plug list |
| 998 | * or when attempting a merge, because blk_schedule_flush_list() will only flush |
| 999 | * the plug list when the task sleeps by itself. For details, please see |
| 1000 | * schedule() where blk_schedule_flush_plug() is called. |
Shaohua Li | 316cc67 | 2011-07-08 08:19:21 +0200 | [diff] [blame] | 1001 | */ |
Jens Axboe | 73c1010 | 2011-03-08 13:19:51 +0100 | [diff] [blame] | 1002 | struct blk_plug { |
Suresh Jayaraman | 75df713 | 2011-09-21 10:00:16 +0200 | [diff] [blame] | 1003 | unsigned long magic; /* detect uninitialized use-cases */ |
| 1004 | struct list_head list; /* requests */ |
| 1005 | struct list_head cb_list; /* md requires an unplug callback */ |
Jens Axboe | 73c1010 | 2011-03-08 13:19:51 +0100 | [diff] [blame] | 1006 | }; |
Shaohua Li | 55c022b | 2011-07-08 08:19:20 +0200 | [diff] [blame] | 1007 | #define BLK_MAX_REQUEST_COUNT 16 |
| 1008 | |
NeilBrown | 9cbb175 | 2012-07-31 09:08:14 +0200 | [diff] [blame] | 1009 | struct blk_plug_cb; |
NeilBrown | 74018dc | 2012-07-31 09:08:15 +0200 | [diff] [blame] | 1010 | typedef void (*blk_plug_cb_fn)(struct blk_plug_cb *, bool); |
NeilBrown | 048c937 | 2011-04-18 09:52:22 +0200 | [diff] [blame] | 1011 | struct blk_plug_cb { |
| 1012 | struct list_head list; |
NeilBrown | 9cbb175 | 2012-07-31 09:08:14 +0200 | [diff] [blame] | 1013 | blk_plug_cb_fn callback; |
| 1014 | void *data; |
NeilBrown | 048c937 | 2011-04-18 09:52:22 +0200 | [diff] [blame] | 1015 | }; |
NeilBrown | 9cbb175 | 2012-07-31 09:08:14 +0200 | [diff] [blame] | 1016 | extern struct blk_plug_cb *blk_check_plugged(blk_plug_cb_fn unplug, |
| 1017 | void *data, int size); |
Jens Axboe | 73c1010 | 2011-03-08 13:19:51 +0100 | [diff] [blame] | 1018 | extern void blk_start_plug(struct blk_plug *); |
| 1019 | extern void blk_finish_plug(struct blk_plug *); |
Jens Axboe | f660378 | 2011-04-15 15:49:07 +0200 | [diff] [blame] | 1020 | extern void blk_flush_plug_list(struct blk_plug *, bool); |
Jens Axboe | 73c1010 | 2011-03-08 13:19:51 +0100 | [diff] [blame] | 1021 | |
| 1022 | static inline void blk_flush_plug(struct task_struct *tsk) |
| 1023 | { |
| 1024 | struct blk_plug *plug = tsk->plug; |
| 1025 | |
Christoph Hellwig | 88b996c | 2011-04-15 15:20:10 +0200 | [diff] [blame] | 1026 | if (plug) |
Jens Axboe | a237c1c | 2011-04-16 13:27:55 +0200 | [diff] [blame] | 1027 | blk_flush_plug_list(plug, false); |
| 1028 | } |
| 1029 | |
| 1030 | static inline void blk_schedule_flush_plug(struct task_struct *tsk) |
| 1031 | { |
| 1032 | struct blk_plug *plug = tsk->plug; |
| 1033 | |
| 1034 | if (plug) |
Jens Axboe | f660378 | 2011-04-15 15:49:07 +0200 | [diff] [blame] | 1035 | blk_flush_plug_list(plug, true); |
Jens Axboe | 73c1010 | 2011-03-08 13:19:51 +0100 | [diff] [blame] | 1036 | } |
| 1037 | |
| 1038 | static inline bool blk_needs_flush_plug(struct task_struct *tsk) |
| 1039 | { |
| 1040 | struct blk_plug *plug = tsk->plug; |
| 1041 | |
NeilBrown | 048c937 | 2011-04-18 09:52:22 +0200 | [diff] [blame] | 1042 | return plug && (!list_empty(&plug->list) || !list_empty(&plug->cb_list)); |
Jens Axboe | 73c1010 | 2011-03-08 13:19:51 +0100 | [diff] [blame] | 1043 | } |
| 1044 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1045 | /* |
| 1046 | * tag stuff |
| 1047 | */ |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 1048 | #define blk_rq_tagged(rq) ((rq)->cmd_flags & REQ_QUEUED) |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 1049 | extern int blk_queue_start_tag(struct request_queue *, struct request *); |
| 1050 | extern struct request *blk_queue_find_tag(struct request_queue *, int); |
| 1051 | extern void blk_queue_end_tag(struct request_queue *, struct request *); |
| 1052 | extern int blk_queue_init_tags(struct request_queue *, int, struct blk_queue_tag *); |
| 1053 | extern void blk_queue_free_tags(struct request_queue *); |
| 1054 | extern int blk_queue_resize_tags(struct request_queue *, int); |
| 1055 | extern void blk_queue_invalidate_tags(struct request_queue *); |
James Bottomley | 492dfb4 | 2006-08-30 15:48:45 -0400 | [diff] [blame] | 1056 | extern struct blk_queue_tag *blk_init_tags(int); |
| 1057 | extern void blk_free_tags(struct blk_queue_tag *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1058 | |
David C Somayajulu | f583f49 | 2006-10-04 08:27:25 +0200 | [diff] [blame] | 1059 | static inline struct request *blk_map_queue_find_tag(struct blk_queue_tag *bqt, |
| 1060 | int tag) |
| 1061 | { |
| 1062 | if (unlikely(bqt == NULL || tag >= bqt->real_max_depth)) |
| 1063 | return NULL; |
| 1064 | return bqt->tag_index[tag]; |
| 1065 | } |
Christoph Hellwig | dd3932e | 2010-09-16 20:51:46 +0200 | [diff] [blame] | 1066 | |
| 1067 | #define BLKDEV_DISCARD_SECURE 0x01 /* secure discard */ |
| 1068 | |
| 1069 | extern int blkdev_issue_flush(struct block_device *, gfp_t, sector_t *); |
Dmitry Monakhov | fbd9b09 | 2010-04-28 17:55:06 +0400 | [diff] [blame] | 1070 | extern int blkdev_issue_discard(struct block_device *bdev, sector_t sector, |
| 1071 | sector_t nr_sects, gfp_t gfp_mask, unsigned long flags); |
Martin K. Petersen | 4363ac7 | 2012-09-18 12:19:27 -0400 | [diff] [blame] | 1072 | extern int blkdev_issue_write_same(struct block_device *bdev, sector_t sector, |
| 1073 | sector_t nr_sects, gfp_t gfp_mask, struct page *page); |
Dmitry Monakhov | 3f14d79 | 2010-04-28 17:55:09 +0400 | [diff] [blame] | 1074 | extern int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, |
Christoph Hellwig | dd3932e | 2010-09-16 20:51:46 +0200 | [diff] [blame] | 1075 | sector_t nr_sects, gfp_t gfp_mask); |
Christoph Hellwig | 2cf6d26 | 2010-08-18 05:29:10 -0400 | [diff] [blame] | 1076 | static inline int sb_issue_discard(struct super_block *sb, sector_t block, |
| 1077 | sector_t nr_blocks, gfp_t gfp_mask, unsigned long flags) |
David Woodhouse | fb2dce8 | 2008-08-05 18:01:53 +0100 | [diff] [blame] | 1078 | { |
Christoph Hellwig | 2cf6d26 | 2010-08-18 05:29:10 -0400 | [diff] [blame] | 1079 | return blkdev_issue_discard(sb->s_bdev, block << (sb->s_blocksize_bits - 9), |
| 1080 | nr_blocks << (sb->s_blocksize_bits - 9), |
| 1081 | gfp_mask, flags); |
David Woodhouse | fb2dce8 | 2008-08-05 18:01:53 +0100 | [diff] [blame] | 1082 | } |
Lukas Czerner | e6fa0be | 2010-10-27 21:30:04 -0400 | [diff] [blame] | 1083 | 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] | 1084 | sector_t nr_blocks, gfp_t gfp_mask) |
Lukas Czerner | e6fa0be | 2010-10-27 21:30:04 -0400 | [diff] [blame] | 1085 | { |
| 1086 | return blkdev_issue_zeroout(sb->s_bdev, |
| 1087 | block << (sb->s_blocksize_bits - 9), |
| 1088 | nr_blocks << (sb->s_blocksize_bits - 9), |
Theodore Ts'o | a107e5a | 2010-10-27 23:44:47 -0400 | [diff] [blame] | 1089 | gfp_mask); |
Lukas Czerner | e6fa0be | 2010-10-27 21:30:04 -0400 | [diff] [blame] | 1090 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1091 | |
Jens Axboe | 018e044 | 2009-06-26 16:27:10 +0200 | [diff] [blame] | 1092 | 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] | 1093 | |
Martin K. Petersen | eb28d31 | 2010-02-26 00:20:37 -0500 | [diff] [blame] | 1094 | enum blk_default_limits { |
| 1095 | BLK_MAX_SEGMENTS = 128, |
| 1096 | BLK_SAFE_MAX_SECTORS = 255, |
| 1097 | BLK_DEF_MAX_SECTORS = 1024, |
| 1098 | BLK_MAX_SEGMENT_SIZE = 65536, |
| 1099 | BLK_SEG_BOUNDARY_MASK = 0xFFFFFFFFUL, |
| 1100 | }; |
Milan Broz | 0e435ac | 2008-12-03 12:55:08 +0100 | [diff] [blame] | 1101 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1102 | #define blkdev_entry_to_request(entry) list_entry((entry), struct request, queuelist) |
| 1103 | |
Martin K. Petersen | ae03bf6 | 2009-05-22 17:17:50 -0400 | [diff] [blame] | 1104 | static inline unsigned long queue_bounce_pfn(struct request_queue *q) |
| 1105 | { |
Martin K. Petersen | 025146e | 2009-05-22 17:17:51 -0400 | [diff] [blame] | 1106 | return q->limits.bounce_pfn; |
Martin K. Petersen | ae03bf6 | 2009-05-22 17:17:50 -0400 | [diff] [blame] | 1107 | } |
| 1108 | |
| 1109 | static inline unsigned long queue_segment_boundary(struct request_queue *q) |
| 1110 | { |
Martin K. Petersen | 025146e | 2009-05-22 17:17:51 -0400 | [diff] [blame] | 1111 | return q->limits.seg_boundary_mask; |
Martin K. Petersen | ae03bf6 | 2009-05-22 17:17:50 -0400 | [diff] [blame] | 1112 | } |
| 1113 | |
| 1114 | static inline unsigned int queue_max_sectors(struct request_queue *q) |
| 1115 | { |
Martin K. Petersen | 025146e | 2009-05-22 17:17:51 -0400 | [diff] [blame] | 1116 | return q->limits.max_sectors; |
Martin K. Petersen | ae03bf6 | 2009-05-22 17:17:50 -0400 | [diff] [blame] | 1117 | } |
| 1118 | |
| 1119 | static inline unsigned int queue_max_hw_sectors(struct request_queue *q) |
| 1120 | { |
Martin K. Petersen | 025146e | 2009-05-22 17:17:51 -0400 | [diff] [blame] | 1121 | return q->limits.max_hw_sectors; |
Martin K. Petersen | ae03bf6 | 2009-05-22 17:17:50 -0400 | [diff] [blame] | 1122 | } |
| 1123 | |
Martin K. Petersen | 8a78362 | 2010-02-26 00:20:39 -0500 | [diff] [blame] | 1124 | static inline unsigned short queue_max_segments(struct request_queue *q) |
Martin K. Petersen | ae03bf6 | 2009-05-22 17:17:50 -0400 | [diff] [blame] | 1125 | { |
Martin K. Petersen | 8a78362 | 2010-02-26 00:20:39 -0500 | [diff] [blame] | 1126 | return q->limits.max_segments; |
Martin K. Petersen | ae03bf6 | 2009-05-22 17:17:50 -0400 | [diff] [blame] | 1127 | } |
| 1128 | |
| 1129 | static inline unsigned int queue_max_segment_size(struct request_queue *q) |
| 1130 | { |
Martin K. Petersen | 025146e | 2009-05-22 17:17:51 -0400 | [diff] [blame] | 1131 | return q->limits.max_segment_size; |
Martin K. Petersen | ae03bf6 | 2009-05-22 17:17:50 -0400 | [diff] [blame] | 1132 | } |
| 1133 | |
Martin K. Petersen | e1defc4 | 2009-05-22 17:17:49 -0400 | [diff] [blame] | 1134 | static inline unsigned short queue_logical_block_size(struct request_queue *q) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1135 | { |
| 1136 | int retval = 512; |
| 1137 | |
Martin K. Petersen | 025146e | 2009-05-22 17:17:51 -0400 | [diff] [blame] | 1138 | if (q && q->limits.logical_block_size) |
| 1139 | retval = q->limits.logical_block_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1140 | |
| 1141 | return retval; |
| 1142 | } |
| 1143 | |
Martin K. Petersen | e1defc4 | 2009-05-22 17:17:49 -0400 | [diff] [blame] | 1144 | static inline unsigned short bdev_logical_block_size(struct block_device *bdev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1145 | { |
Martin K. Petersen | e1defc4 | 2009-05-22 17:17:49 -0400 | [diff] [blame] | 1146 | return queue_logical_block_size(bdev_get_queue(bdev)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1147 | } |
| 1148 | |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 1149 | static inline unsigned int queue_physical_block_size(struct request_queue *q) |
| 1150 | { |
| 1151 | return q->limits.physical_block_size; |
| 1152 | } |
| 1153 | |
Martin K. Petersen | 892b6f9 | 2010-10-13 21:18:03 +0200 | [diff] [blame] | 1154 | 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] | 1155 | { |
| 1156 | return queue_physical_block_size(bdev_get_queue(bdev)); |
| 1157 | } |
| 1158 | |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 1159 | static inline unsigned int queue_io_min(struct request_queue *q) |
| 1160 | { |
| 1161 | return q->limits.io_min; |
| 1162 | } |
| 1163 | |
Martin K. Petersen | ac481c2 | 2009-10-03 20:52:01 +0200 | [diff] [blame] | 1164 | static inline int bdev_io_min(struct block_device *bdev) |
| 1165 | { |
| 1166 | return queue_io_min(bdev_get_queue(bdev)); |
| 1167 | } |
| 1168 | |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 1169 | static inline unsigned int queue_io_opt(struct request_queue *q) |
| 1170 | { |
| 1171 | return q->limits.io_opt; |
| 1172 | } |
| 1173 | |
Martin K. Petersen | ac481c2 | 2009-10-03 20:52:01 +0200 | [diff] [blame] | 1174 | static inline int bdev_io_opt(struct block_device *bdev) |
| 1175 | { |
| 1176 | return queue_io_opt(bdev_get_queue(bdev)); |
| 1177 | } |
| 1178 | |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 1179 | static inline int queue_alignment_offset(struct request_queue *q) |
| 1180 | { |
Martin K. Petersen | ac481c2 | 2009-10-03 20:52:01 +0200 | [diff] [blame] | 1181 | if (q->limits.misaligned) |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 1182 | return -1; |
| 1183 | |
Martin K. Petersen | ac481c2 | 2009-10-03 20:52:01 +0200 | [diff] [blame] | 1184 | return q->limits.alignment_offset; |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 1185 | } |
| 1186 | |
Martin K. Petersen | e03a72e | 2010-01-11 03:21:51 -0500 | [diff] [blame] | 1187 | 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] | 1188 | { |
| 1189 | unsigned int granularity = max(lim->physical_block_size, lim->io_min); |
Martin K. Petersen | e03a72e | 2010-01-11 03:21:51 -0500 | [diff] [blame] | 1190 | unsigned int alignment = (sector << 9) & (granularity - 1); |
Martin K. Petersen | 81744ee | 2009-12-29 08:35:35 +0100 | [diff] [blame] | 1191 | |
Martin K. Petersen | e03a72e | 2010-01-11 03:21:51 -0500 | [diff] [blame] | 1192 | return (granularity + lim->alignment_offset - alignment) |
| 1193 | & (granularity - 1); |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 1194 | } |
| 1195 | |
Martin K. Petersen | ac481c2 | 2009-10-03 20:52:01 +0200 | [diff] [blame] | 1196 | static inline int bdev_alignment_offset(struct block_device *bdev) |
| 1197 | { |
| 1198 | struct request_queue *q = bdev_get_queue(bdev); |
| 1199 | |
| 1200 | if (q->limits.misaligned) |
| 1201 | return -1; |
| 1202 | |
| 1203 | if (bdev != bdev->bd_contains) |
| 1204 | return bdev->bd_part->alignment_offset; |
| 1205 | |
| 1206 | return q->limits.alignment_offset; |
| 1207 | } |
| 1208 | |
Martin K. Petersen | 86b3728 | 2009-11-10 11:50:21 +0100 | [diff] [blame] | 1209 | static inline int queue_discard_alignment(struct request_queue *q) |
| 1210 | { |
| 1211 | if (q->limits.discard_misaligned) |
| 1212 | return -1; |
| 1213 | |
| 1214 | return q->limits.discard_alignment; |
| 1215 | } |
| 1216 | |
Martin K. Petersen | e03a72e | 2010-01-11 03:21:51 -0500 | [diff] [blame] | 1217 | 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] | 1218 | { |
Linus Torvalds | 5977107 | 2012-12-19 07:18:35 -0800 | [diff] [blame] | 1219 | unsigned int alignment, granularity, offset; |
Martin K. Petersen | dd3d145 | 2010-01-11 03:21:48 -0500 | [diff] [blame] | 1220 | |
Martin K. Petersen | a934a00 | 2011-05-18 10:37:35 +0200 | [diff] [blame] | 1221 | if (!lim->max_discard_sectors) |
| 1222 | return 0; |
| 1223 | |
Linus Torvalds | 5977107 | 2012-12-19 07:18:35 -0800 | [diff] [blame] | 1224 | /* Why are these in bytes, not sectors? */ |
| 1225 | alignment = lim->discard_alignment >> 9; |
| 1226 | granularity = lim->discard_granularity >> 9; |
| 1227 | if (!granularity) |
| 1228 | return 0; |
| 1229 | |
| 1230 | /* Offset of the partition start in 'granularity' sectors */ |
| 1231 | offset = sector_div(sector, granularity); |
| 1232 | |
| 1233 | /* And why do we do this modulus *again* in blkdev_issue_discard()? */ |
| 1234 | offset = (granularity + alignment - offset) % granularity; |
| 1235 | |
| 1236 | /* Turn it back into bytes, gaah */ |
| 1237 | return offset << 9; |
Martin K. Petersen | 86b3728 | 2009-11-10 11:50:21 +0100 | [diff] [blame] | 1238 | } |
| 1239 | |
Paolo Bonzini | c6e6663 | 2012-08-02 09:48:50 +0200 | [diff] [blame] | 1240 | static inline int bdev_discard_alignment(struct block_device *bdev) |
| 1241 | { |
| 1242 | struct request_queue *q = bdev_get_queue(bdev); |
| 1243 | |
| 1244 | if (bdev != bdev->bd_contains) |
| 1245 | return bdev->bd_part->discard_alignment; |
| 1246 | |
| 1247 | return q->limits.discard_alignment; |
| 1248 | } |
| 1249 | |
Martin K. Petersen | 98262f2 | 2009-12-03 09:24:48 +0100 | [diff] [blame] | 1250 | static inline unsigned int queue_discard_zeroes_data(struct request_queue *q) |
| 1251 | { |
Martin K. Petersen | a934a00 | 2011-05-18 10:37:35 +0200 | [diff] [blame] | 1252 | 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] | 1253 | return 1; |
| 1254 | |
| 1255 | return 0; |
| 1256 | } |
| 1257 | |
| 1258 | static inline unsigned int bdev_discard_zeroes_data(struct block_device *bdev) |
| 1259 | { |
| 1260 | return queue_discard_zeroes_data(bdev_get_queue(bdev)); |
| 1261 | } |
| 1262 | |
Martin K. Petersen | 4363ac7 | 2012-09-18 12:19:27 -0400 | [diff] [blame] | 1263 | static inline unsigned int bdev_write_same(struct block_device *bdev) |
| 1264 | { |
| 1265 | struct request_queue *q = bdev_get_queue(bdev); |
| 1266 | |
| 1267 | if (q) |
| 1268 | return q->limits.max_write_same_sectors; |
| 1269 | |
| 1270 | return 0; |
| 1271 | } |
| 1272 | |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 1273 | static inline int queue_dma_alignment(struct request_queue *q) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1274 | { |
Pete Wyckoff | 482eb68 | 2008-01-01 10:23:02 -0500 | [diff] [blame] | 1275 | return q ? q->dma_alignment : 511; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1276 | } |
| 1277 | |
Namhyung Kim | 1441779 | 2010-09-15 13:08:27 +0200 | [diff] [blame] | 1278 | 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] | 1279 | unsigned int len) |
| 1280 | { |
| 1281 | unsigned int alignment = queue_dma_alignment(q) | q->dma_pad_mask; |
Namhyung Kim | 1441779 | 2010-09-15 13:08:27 +0200 | [diff] [blame] | 1282 | return !(addr & alignment) && !(len & alignment); |
FUJITA Tomonori | 8790407 | 2008-08-28 15:05:58 +0900 | [diff] [blame] | 1283 | } |
| 1284 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1285 | /* assumes size > 256 */ |
| 1286 | static inline unsigned int blksize_bits(unsigned int size) |
| 1287 | { |
| 1288 | unsigned int bits = 8; |
| 1289 | do { |
| 1290 | bits++; |
| 1291 | size >>= 1; |
| 1292 | } while (size > 256); |
| 1293 | return bits; |
| 1294 | } |
| 1295 | |
Adrian Bunk | 2befb9e | 2005-09-10 00:27:17 -0700 | [diff] [blame] | 1296 | static inline unsigned int block_size(struct block_device *bdev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1297 | { |
| 1298 | return bdev->bd_block_size; |
| 1299 | } |
| 1300 | |
shaohua.li@intel.com | f387693 | 2011-05-06 11:34:32 -0600 | [diff] [blame] | 1301 | static inline bool queue_flush_queueable(struct request_queue *q) |
| 1302 | { |
| 1303 | return !q->flush_not_queueable; |
| 1304 | } |
| 1305 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1306 | typedef struct {struct page *v;} Sector; |
| 1307 | |
| 1308 | unsigned char *read_dev_sector(struct block_device *, sector_t, Sector *); |
| 1309 | |
| 1310 | static inline void put_dev_sector(Sector p) |
| 1311 | { |
| 1312 | page_cache_release(p.v); |
| 1313 | } |
| 1314 | |
| 1315 | struct work_struct; |
Jens Axboe | 18887ad | 2008-07-28 13:08:45 +0200 | [diff] [blame] | 1316 | int kblockd_schedule_work(struct request_queue *q, struct work_struct *work); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1317 | |
Divyesh Shah | 9195291 | 2010-04-01 15:01:41 -0700 | [diff] [blame] | 1318 | #ifdef CONFIG_BLK_CGROUP |
Jens Axboe | 28f4197 | 2010-06-01 12:23:18 +0200 | [diff] [blame] | 1319 | /* |
| 1320 | * This should not be using sched_clock(). A real patch is in progress |
| 1321 | * to fix this up, until that is in place we need to disable preemption |
| 1322 | * around sched_clock() in this function and set_io_start_time_ns(). |
| 1323 | */ |
Divyesh Shah | 9195291 | 2010-04-01 15:01:41 -0700 | [diff] [blame] | 1324 | static inline void set_start_time_ns(struct request *req) |
| 1325 | { |
Jens Axboe | 28f4197 | 2010-06-01 12:23:18 +0200 | [diff] [blame] | 1326 | preempt_disable(); |
Divyesh Shah | 9195291 | 2010-04-01 15:01:41 -0700 | [diff] [blame] | 1327 | req->start_time_ns = sched_clock(); |
Jens Axboe | 28f4197 | 2010-06-01 12:23:18 +0200 | [diff] [blame] | 1328 | preempt_enable(); |
Divyesh Shah | 9195291 | 2010-04-01 15:01:41 -0700 | [diff] [blame] | 1329 | } |
| 1330 | |
| 1331 | static inline void set_io_start_time_ns(struct request *req) |
| 1332 | { |
Jens Axboe | 28f4197 | 2010-06-01 12:23:18 +0200 | [diff] [blame] | 1333 | preempt_disable(); |
Divyesh Shah | 9195291 | 2010-04-01 15:01:41 -0700 | [diff] [blame] | 1334 | req->io_start_time_ns = sched_clock(); |
Jens Axboe | 28f4197 | 2010-06-01 12:23:18 +0200 | [diff] [blame] | 1335 | preempt_enable(); |
Divyesh Shah | 9195291 | 2010-04-01 15:01:41 -0700 | [diff] [blame] | 1336 | } |
Divyesh Shah | 84c124d | 2010-04-09 08:31:19 +0200 | [diff] [blame] | 1337 | |
| 1338 | static inline uint64_t rq_start_time_ns(struct request *req) |
| 1339 | { |
| 1340 | return req->start_time_ns; |
| 1341 | } |
| 1342 | |
| 1343 | static inline uint64_t rq_io_start_time_ns(struct request *req) |
| 1344 | { |
| 1345 | return req->io_start_time_ns; |
| 1346 | } |
Divyesh Shah | 9195291 | 2010-04-01 15:01:41 -0700 | [diff] [blame] | 1347 | #else |
| 1348 | static inline void set_start_time_ns(struct request *req) {} |
| 1349 | static inline void set_io_start_time_ns(struct request *req) {} |
Divyesh Shah | 84c124d | 2010-04-09 08:31:19 +0200 | [diff] [blame] | 1350 | static inline uint64_t rq_start_time_ns(struct request *req) |
| 1351 | { |
| 1352 | return 0; |
| 1353 | } |
| 1354 | static inline uint64_t rq_io_start_time_ns(struct request *req) |
| 1355 | { |
| 1356 | return 0; |
| 1357 | } |
Divyesh Shah | 9195291 | 2010-04-01 15:01:41 -0700 | [diff] [blame] | 1358 | #endif |
| 1359 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1360 | #define MODULE_ALIAS_BLOCKDEV(major,minor) \ |
| 1361 | MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor)) |
| 1362 | #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \ |
| 1363 | MODULE_ALIAS("block-major-" __stringify(major) "-*") |
| 1364 | |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 1365 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
| 1366 | |
Jens Axboe | b24498d | 2008-06-27 09:12:09 +0200 | [diff] [blame] | 1367 | #define INTEGRITY_FLAG_READ 2 /* verify data integrity on read */ |
| 1368 | #define INTEGRITY_FLAG_WRITE 4 /* generate data integrity on write */ |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 1369 | |
| 1370 | struct blk_integrity_exchg { |
| 1371 | void *prot_buf; |
| 1372 | void *data_buf; |
| 1373 | sector_t sector; |
| 1374 | unsigned int data_size; |
| 1375 | unsigned short sector_size; |
| 1376 | const char *disk_name; |
| 1377 | }; |
| 1378 | |
| 1379 | typedef void (integrity_gen_fn) (struct blk_integrity_exchg *); |
| 1380 | typedef int (integrity_vrfy_fn) (struct blk_integrity_exchg *); |
| 1381 | typedef void (integrity_set_tag_fn) (void *, void *, unsigned int); |
| 1382 | typedef void (integrity_get_tag_fn) (void *, void *, unsigned int); |
| 1383 | |
| 1384 | struct blk_integrity { |
| 1385 | integrity_gen_fn *generate_fn; |
| 1386 | integrity_vrfy_fn *verify_fn; |
| 1387 | integrity_set_tag_fn *set_tag_fn; |
| 1388 | integrity_get_tag_fn *get_tag_fn; |
| 1389 | |
| 1390 | unsigned short flags; |
| 1391 | unsigned short tuple_size; |
| 1392 | unsigned short sector_size; |
| 1393 | unsigned short tag_size; |
| 1394 | |
| 1395 | const char *name; |
| 1396 | |
| 1397 | struct kobject kobj; |
| 1398 | }; |
| 1399 | |
Mike Snitzer | a63a5cf | 2011-04-01 21:02:31 +0200 | [diff] [blame] | 1400 | extern bool blk_integrity_is_initialized(struct gendisk *); |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 1401 | extern int blk_integrity_register(struct gendisk *, struct blk_integrity *); |
| 1402 | extern void blk_integrity_unregister(struct gendisk *); |
Martin K. Petersen | ad7fce9 | 2008-10-01 03:38:39 -0400 | [diff] [blame] | 1403 | extern int blk_integrity_compare(struct gendisk *, struct gendisk *); |
Martin K. Petersen | 13f05c8 | 2010-09-10 20:50:10 +0200 | [diff] [blame] | 1404 | extern int blk_rq_map_integrity_sg(struct request_queue *, struct bio *, |
| 1405 | struct scatterlist *); |
| 1406 | extern int blk_rq_count_integrity_sg(struct request_queue *, struct bio *); |
| 1407 | extern int blk_integrity_merge_rq(struct request_queue *, struct request *, |
| 1408 | struct request *); |
| 1409 | extern int blk_integrity_merge_bio(struct request_queue *, struct request *, |
| 1410 | struct bio *); |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 1411 | |
Jens Axboe | b04accc | 2008-10-02 12:53:22 +0200 | [diff] [blame] | 1412 | static inline |
| 1413 | struct blk_integrity *bdev_get_integrity(struct block_device *bdev) |
| 1414 | { |
| 1415 | return bdev->bd_disk->integrity; |
| 1416 | } |
| 1417 | |
Martin K. Petersen | b02739b | 2008-10-02 18:47:49 +0200 | [diff] [blame] | 1418 | static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk) |
| 1419 | { |
| 1420 | return disk->integrity; |
| 1421 | } |
| 1422 | |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 1423 | static inline int blk_integrity_rq(struct request *rq) |
| 1424 | { |
Martin K. Petersen | d442cc4 | 2008-07-16 16:09:06 -0400 | [diff] [blame] | 1425 | if (rq->bio == NULL) |
| 1426 | return 0; |
| 1427 | |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 1428 | return bio_integrity(rq->bio); |
| 1429 | } |
| 1430 | |
Martin K. Petersen | 13f05c8 | 2010-09-10 20:50:10 +0200 | [diff] [blame] | 1431 | static inline void blk_queue_max_integrity_segments(struct request_queue *q, |
| 1432 | unsigned int segs) |
| 1433 | { |
| 1434 | q->limits.max_integrity_segments = segs; |
| 1435 | } |
| 1436 | |
| 1437 | static inline unsigned short |
| 1438 | queue_max_integrity_segments(struct request_queue *q) |
| 1439 | { |
| 1440 | return q->limits.max_integrity_segments; |
| 1441 | } |
| 1442 | |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 1443 | #else /* CONFIG_BLK_DEV_INTEGRITY */ |
| 1444 | |
Stephen Rothwell | fd83240 | 2012-01-12 09:17:30 +0100 | [diff] [blame] | 1445 | struct bio; |
| 1446 | struct block_device; |
| 1447 | struct gendisk; |
| 1448 | struct blk_integrity; |
| 1449 | |
| 1450 | static inline int blk_integrity_rq(struct request *rq) |
| 1451 | { |
| 1452 | return 0; |
| 1453 | } |
| 1454 | static inline int blk_rq_count_integrity_sg(struct request_queue *q, |
| 1455 | struct bio *b) |
| 1456 | { |
| 1457 | return 0; |
| 1458 | } |
| 1459 | static inline int blk_rq_map_integrity_sg(struct request_queue *q, |
| 1460 | struct bio *b, |
| 1461 | struct scatterlist *s) |
| 1462 | { |
| 1463 | return 0; |
| 1464 | } |
| 1465 | static inline struct blk_integrity *bdev_get_integrity(struct block_device *b) |
| 1466 | { |
| 1467 | return 0; |
| 1468 | } |
| 1469 | static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk) |
| 1470 | { |
| 1471 | return NULL; |
| 1472 | } |
| 1473 | static inline int blk_integrity_compare(struct gendisk *a, struct gendisk *b) |
| 1474 | { |
| 1475 | return 0; |
| 1476 | } |
| 1477 | static inline int blk_integrity_register(struct gendisk *d, |
| 1478 | struct blk_integrity *b) |
| 1479 | { |
| 1480 | return 0; |
| 1481 | } |
| 1482 | static inline void blk_integrity_unregister(struct gendisk *d) |
| 1483 | { |
| 1484 | } |
| 1485 | static inline void blk_queue_max_integrity_segments(struct request_queue *q, |
| 1486 | unsigned int segs) |
| 1487 | { |
| 1488 | } |
| 1489 | static inline unsigned short queue_max_integrity_segments(struct request_queue *q) |
| 1490 | { |
| 1491 | return 0; |
| 1492 | } |
| 1493 | static inline int blk_integrity_merge_rq(struct request_queue *rq, |
| 1494 | struct request *r1, |
| 1495 | struct request *r2) |
| 1496 | { |
| 1497 | return 0; |
| 1498 | } |
| 1499 | static inline int blk_integrity_merge_bio(struct request_queue *rq, |
| 1500 | struct request *r, |
| 1501 | struct bio *b) |
| 1502 | { |
| 1503 | return 0; |
| 1504 | } |
| 1505 | static inline bool blk_integrity_is_initialized(struct gendisk *g) |
| 1506 | { |
| 1507 | return 0; |
| 1508 | } |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 1509 | |
| 1510 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ |
| 1511 | |
Al Viro | 08f8585 | 2007-10-08 13:26:20 -0400 | [diff] [blame] | 1512 | struct block_device_operations { |
Al Viro | d4430d62 | 2008-03-02 09:09:22 -0500 | [diff] [blame] | 1513 | int (*open) (struct block_device *, fmode_t); |
Al Viro | db2a144 | 2013-05-05 21:52:57 -0400 | [diff] [blame] | 1514 | void (*release) (struct gendisk *, fmode_t); |
Al Viro | d4430d62 | 2008-03-02 09:09:22 -0500 | [diff] [blame] | 1515 | int (*ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); |
| 1516 | int (*compat_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); |
Al Viro | 08f8585 | 2007-10-08 13:26:20 -0400 | [diff] [blame] | 1517 | int (*direct_access) (struct block_device *, sector_t, |
| 1518 | void **, unsigned long *); |
Tejun Heo | 77ea887 | 2010-12-08 20:57:37 +0100 | [diff] [blame] | 1519 | unsigned int (*check_events) (struct gendisk *disk, |
| 1520 | unsigned int clearing); |
| 1521 | /* ->media_changed() is DEPRECATED, use ->check_events() instead */ |
Al Viro | 08f8585 | 2007-10-08 13:26:20 -0400 | [diff] [blame] | 1522 | int (*media_changed) (struct gendisk *); |
Tejun Heo | c3e33e0 | 2010-05-15 20:09:29 +0200 | [diff] [blame] | 1523 | void (*unlock_native_capacity) (struct gendisk *); |
Al Viro | 08f8585 | 2007-10-08 13:26:20 -0400 | [diff] [blame] | 1524 | int (*revalidate_disk) (struct gendisk *); |
| 1525 | int (*getgeo)(struct block_device *, struct hd_geometry *); |
Nitin Gupta | b3a27d0 | 2010-05-17 11:02:43 +0530 | [diff] [blame] | 1526 | /* this callback is with swap_lock and sometimes page table lock held */ |
| 1527 | void (*swap_slot_free_notify) (struct block_device *, unsigned long); |
Al Viro | 08f8585 | 2007-10-08 13:26:20 -0400 | [diff] [blame] | 1528 | struct module *owner; |
| 1529 | }; |
| 1530 | |
Al Viro | 633a08b | 2007-08-29 20:34:12 -0400 | [diff] [blame] | 1531 | extern int __blkdev_driver_ioctl(struct block_device *, fmode_t, unsigned int, |
| 1532 | unsigned long); |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 1533 | #else /* CONFIG_BLOCK */ |
| 1534 | /* |
| 1535 | * stubs for when the block layer is configured out |
| 1536 | */ |
| 1537 | #define buffer_heads_over_limit 0 |
| 1538 | |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 1539 | static inline long nr_blockdev_pages(void) |
| 1540 | { |
| 1541 | return 0; |
| 1542 | } |
| 1543 | |
Jens Axboe | 1f940bd | 2011-03-11 20:17:08 +0100 | [diff] [blame] | 1544 | struct blk_plug { |
| 1545 | }; |
| 1546 | |
| 1547 | static inline void blk_start_plug(struct blk_plug *plug) |
Jens Axboe | 73c1010 | 2011-03-08 13:19:51 +0100 | [diff] [blame] | 1548 | { |
| 1549 | } |
| 1550 | |
Jens Axboe | 1f940bd | 2011-03-11 20:17:08 +0100 | [diff] [blame] | 1551 | static inline void blk_finish_plug(struct blk_plug *plug) |
Jens Axboe | 73c1010 | 2011-03-08 13:19:51 +0100 | [diff] [blame] | 1552 | { |
| 1553 | } |
| 1554 | |
Jens Axboe | 1f940bd | 2011-03-11 20:17:08 +0100 | [diff] [blame] | 1555 | static inline void blk_flush_plug(struct task_struct *task) |
Jens Axboe | 73c1010 | 2011-03-08 13:19:51 +0100 | [diff] [blame] | 1556 | { |
| 1557 | } |
| 1558 | |
Jens Axboe | a237c1c | 2011-04-16 13:27:55 +0200 | [diff] [blame] | 1559 | static inline void blk_schedule_flush_plug(struct task_struct *task) |
| 1560 | { |
| 1561 | } |
| 1562 | |
| 1563 | |
Jens Axboe | 73c1010 | 2011-03-08 13:19:51 +0100 | [diff] [blame] | 1564 | static inline bool blk_needs_flush_plug(struct task_struct *tsk) |
| 1565 | { |
| 1566 | return false; |
| 1567 | } |
| 1568 | |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 1569 | #endif /* CONFIG_BLOCK */ |
| 1570 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1571 | #endif |