Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | #ifndef _LINUX_BLKDEV_H |
| 2 | #define _LINUX_BLKDEV_H |
| 3 | |
Jens Axboe | f5ff842 | 2007-09-21 09:19:54 +0200 | [diff] [blame] | 4 | #ifdef CONFIG_BLOCK |
| 5 | |
Andrew Morton | bcfd8d3 | 2006-08-31 12:56:06 +0200 | [diff] [blame] | 6 | #include <linux/sched.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 7 | #include <linux/major.h> |
| 8 | #include <linux/genhd.h> |
| 9 | #include <linux/list.h> |
| 10 | #include <linux/timer.h> |
| 11 | #include <linux/workqueue.h> |
| 12 | #include <linux/pagemap.h> |
| 13 | #include <linux/backing-dev.h> |
| 14 | #include <linux/wait.h> |
| 15 | #include <linux/mempool.h> |
| 16 | #include <linux/bio.h> |
| 17 | #include <linux/module.h> |
| 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> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | |
| 23 | #include <asm/scatterlist.h> |
| 24 | |
Christoph Hellwig | 21b2f0c | 2006-03-22 17:52:04 +0100 | [diff] [blame] | 25 | struct scsi_ioctl_command; |
| 26 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | struct request_queue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | struct elevator_queue; |
| 29 | typedef struct elevator_queue elevator_t; |
| 30 | struct request_pm_state; |
Jens Axboe | 2056a78 | 2006-03-23 20:00:26 +0100 | [diff] [blame] | 31 | struct blk_trace; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 32 | struct request; |
| 33 | struct sg_io_hdr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | |
| 35 | #define BLKDEV_MIN_RQ 4 |
| 36 | #define BLKDEV_MAX_RQ 128 /* Default maximum */ |
| 37 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | struct request; |
Tejun Heo | 8ffdc65 | 2006-01-06 09:49:03 +0100 | [diff] [blame] | 39 | typedef void (rq_end_io_fn)(struct request *, int); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | |
| 41 | struct request_list { |
| 42 | int count[2]; |
| 43 | int starved[2]; |
Tejun Heo | cb98fc8 | 2005-10-28 08:29:39 +0200 | [diff] [blame] | 44 | int elvpriv; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | mempool_t *rq_pool; |
| 46 | wait_queue_head_t wait[2]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | }; |
| 48 | |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 49 | /* |
| 50 | * request command types |
| 51 | */ |
| 52 | enum rq_cmd_type_bits { |
| 53 | REQ_TYPE_FS = 1, /* fs request */ |
| 54 | REQ_TYPE_BLOCK_PC, /* scsi command */ |
| 55 | REQ_TYPE_SENSE, /* sense request */ |
| 56 | REQ_TYPE_PM_SUSPEND, /* suspend request */ |
| 57 | REQ_TYPE_PM_RESUME, /* resume request */ |
| 58 | REQ_TYPE_PM_SHUTDOWN, /* shutdown request */ |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 59 | REQ_TYPE_SPECIAL, /* driver defined type */ |
| 60 | REQ_TYPE_LINUX_BLOCK, /* generic block layer message */ |
| 61 | /* |
| 62 | * for ATA/ATAPI devices. this really doesn't belong here, ide should |
| 63 | * use REQ_TYPE_SPECIAL and use rq->cmd[0] with the range of driver |
| 64 | * private REQ_LB opcodes to differentiate what type of request this is |
| 65 | */ |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 66 | REQ_TYPE_ATA_TASKFILE, |
Jens Axboe | cea2885 | 2006-10-12 15:08:45 +0200 | [diff] [blame] | 67 | REQ_TYPE_ATA_PC, |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 68 | }; |
| 69 | |
| 70 | /* |
| 71 | * For request of type REQ_TYPE_LINUX_BLOCK, rq->cmd[0] is the opcode being |
| 72 | * sent down (similar to how REQ_TYPE_BLOCK_PC means that ->cmd[] holds a |
| 73 | * SCSI cdb. |
| 74 | * |
| 75 | * 0x00 -> 0x3f are driver private, to be used for whatever purpose they need, |
| 76 | * typically to differentiate REQ_TYPE_SPECIAL requests. |
| 77 | * |
| 78 | */ |
| 79 | enum { |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 80 | REQ_LB_OP_EJECT = 0x40, /* eject request */ |
David Woodhouse | 1a8e2bd | 2008-08-13 12:35:09 +0100 | [diff] [blame] | 81 | REQ_LB_OP_FLUSH = 0x41, /* flush request */ |
David Woodhouse | eae9acd | 2008-08-05 18:08:25 +0100 | [diff] [blame] | 82 | REQ_LB_OP_DISCARD = 0x42, /* discard sectors */ |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 83 | }; |
| 84 | |
| 85 | /* |
David Woodhouse | d628eae | 2008-08-09 16:22:17 +0100 | [diff] [blame] | 86 | * request type modified bits. first two bits match BIO_RW* bits, important |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 87 | */ |
| 88 | enum rq_flag_bits { |
| 89 | __REQ_RW, /* not set, read. set, write */ |
| 90 | __REQ_FAILFAST, /* no low level driver retries */ |
David Woodhouse | fb2dce8 | 2008-08-05 18:01:53 +0100 | [diff] [blame] | 91 | __REQ_DISCARD, /* request to discard sectors */ |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 92 | __REQ_SORTED, /* elevator knows about this request */ |
| 93 | __REQ_SOFTBARRIER, /* may not be passed by ioscheduler */ |
| 94 | __REQ_HARDBARRIER, /* may not be passed by drive either */ |
| 95 | __REQ_FUA, /* forced unit access */ |
| 96 | __REQ_NOMERGE, /* don't touch this for merging */ |
| 97 | __REQ_STARTED, /* drive already may have started this one */ |
| 98 | __REQ_DONTPREP, /* don't call prep for this one */ |
| 99 | __REQ_QUEUED, /* uses queueing */ |
| 100 | __REQ_ELVPRIV, /* elevator private data attached */ |
| 101 | __REQ_FAILED, /* set if the request failed */ |
| 102 | __REQ_QUIET, /* don't worry about errors */ |
| 103 | __REQ_PREEMPT, /* set for "ide_preempt" requests */ |
| 104 | __REQ_ORDERED_COLOR, /* is before or after barrier */ |
| 105 | __REQ_RW_SYNC, /* request is sync (O_DIRECT) */ |
Jens Axboe | 49171e5 | 2006-08-10 08:59:11 +0200 | [diff] [blame] | 106 | __REQ_ALLOCED, /* request came from our alloc pool */ |
Jens Axboe | 5404bc7 | 2006-08-10 09:01:02 +0200 | [diff] [blame] | 107 | __REQ_RW_META, /* metadata io request */ |
FUJITA Tomonori | f18573a | 2008-04-11 12:56:52 +0200 | [diff] [blame] | 108 | __REQ_COPY_USER, /* contains copies of user pages */ |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 109 | __REQ_INTEGRITY, /* integrity metadata has been remapped */ |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 110 | __REQ_NR_BITS, /* stops here */ |
| 111 | }; |
| 112 | |
| 113 | #define REQ_RW (1 << __REQ_RW) |
David Woodhouse | fb2dce8 | 2008-08-05 18:01:53 +0100 | [diff] [blame] | 114 | #define REQ_DISCARD (1 << __REQ_DISCARD) |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 115 | #define REQ_FAILFAST (1 << __REQ_FAILFAST) |
| 116 | #define REQ_SORTED (1 << __REQ_SORTED) |
| 117 | #define REQ_SOFTBARRIER (1 << __REQ_SOFTBARRIER) |
| 118 | #define REQ_HARDBARRIER (1 << __REQ_HARDBARRIER) |
| 119 | #define REQ_FUA (1 << __REQ_FUA) |
| 120 | #define REQ_NOMERGE (1 << __REQ_NOMERGE) |
| 121 | #define REQ_STARTED (1 << __REQ_STARTED) |
| 122 | #define REQ_DONTPREP (1 << __REQ_DONTPREP) |
| 123 | #define REQ_QUEUED (1 << __REQ_QUEUED) |
| 124 | #define REQ_ELVPRIV (1 << __REQ_ELVPRIV) |
| 125 | #define REQ_FAILED (1 << __REQ_FAILED) |
| 126 | #define REQ_QUIET (1 << __REQ_QUIET) |
| 127 | #define REQ_PREEMPT (1 << __REQ_PREEMPT) |
| 128 | #define REQ_ORDERED_COLOR (1 << __REQ_ORDERED_COLOR) |
| 129 | #define REQ_RW_SYNC (1 << __REQ_RW_SYNC) |
Jens Axboe | 49171e5 | 2006-08-10 08:59:11 +0200 | [diff] [blame] | 130 | #define REQ_ALLOCED (1 << __REQ_ALLOCED) |
Jens Axboe | 5404bc7 | 2006-08-10 09:01:02 +0200 | [diff] [blame] | 131 | #define REQ_RW_META (1 << __REQ_RW_META) |
FUJITA Tomonori | f18573a | 2008-04-11 12:56:52 +0200 | [diff] [blame] | 132 | #define REQ_COPY_USER (1 << __REQ_COPY_USER) |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 133 | #define REQ_INTEGRITY (1 << __REQ_INTEGRITY) |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 134 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 135 | #define BLK_MAX_CDB 16 |
| 136 | |
| 137 | /* |
Jens Axboe | 63a7138 | 2008-02-08 12:41:03 +0100 | [diff] [blame] | 138 | * try to put the fields that are referenced together in the same cacheline. |
| 139 | * if you modify this structure, be sure to check block/blk-core.c:rq_init() |
| 140 | * as well! |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 141 | */ |
| 142 | struct request { |
Jens Axboe | ff856ba | 2006-01-09 16:02:34 +0100 | [diff] [blame] | 143 | struct list_head queuelist; |
Jens Axboe | c7c22e4 | 2008-09-13 20:26:01 +0200 | [diff] [blame] | 144 | struct call_single_data csd; |
| 145 | int cpu; |
Jens Axboe | ff856ba | 2006-01-09 16:02:34 +0100 | [diff] [blame] | 146 | |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 147 | struct request_queue *q; |
Jens Axboe | e6a1c87 | 2006-08-10 09:00:21 +0200 | [diff] [blame] | 148 | |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 149 | unsigned int cmd_flags; |
| 150 | enum rq_cmd_type_bits cmd_type; |
Jens Axboe | 242f9dc | 2008-09-14 05:55:09 -0700 | [diff] [blame] | 151 | unsigned long atomic_flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | |
| 153 | /* Maintain bio traversal state for part by part I/O submission. |
| 154 | * hard_* are block layer internals, no driver should touch them! |
| 155 | */ |
| 156 | |
| 157 | sector_t sector; /* next sector to submit */ |
Jens Axboe | e6a1c87 | 2006-08-10 09:00:21 +0200 | [diff] [blame] | 158 | sector_t hard_sector; /* next sector to complete */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | unsigned long nr_sectors; /* no. of sectors left to submit */ |
Jens Axboe | e6a1c87 | 2006-08-10 09:00:21 +0200 | [diff] [blame] | 160 | unsigned long hard_nr_sectors; /* no. of sectors left to complete */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 161 | /* no. of sectors left to submit in the current segment */ |
| 162 | unsigned int current_nr_sectors; |
| 163 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 164 | /* no. of sectors left to complete in the current segment */ |
| 165 | unsigned int hard_cur_sectors; |
| 166 | |
| 167 | struct bio *bio; |
| 168 | struct bio *biotail; |
| 169 | |
Jens Axboe | 9817064 | 2006-07-28 09:23:08 +0200 | [diff] [blame] | 170 | struct hlist_node hash; /* merge hash */ |
Jens Axboe | e6a1c87 | 2006-08-10 09:00:21 +0200 | [diff] [blame] | 171 | /* |
| 172 | * The rb_node is only used inside the io scheduler, requests |
| 173 | * are pruned when moved to the dispatch queue. So let the |
| 174 | * completion_data share space with the rb_node. |
| 175 | */ |
| 176 | union { |
| 177 | struct rb_node rb_node; /* sort/lookup */ |
| 178 | void *completion_data; |
| 179 | }; |
Jens Axboe | 9817064 | 2006-07-28 09:23:08 +0200 | [diff] [blame] | 180 | |
Jens Axboe | ff7d145 | 2006-07-12 14:04:37 +0200 | [diff] [blame] | 181 | /* |
| 182 | * two pointers are available for the IO schedulers, if they need |
| 183 | * more they have to dynamically allocate it. |
| 184 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 185 | void *elevator_private; |
Jens Axboe | ff7d145 | 2006-07-12 14:04:37 +0200 | [diff] [blame] | 186 | void *elevator_private2; |
| 187 | |
Jens Axboe | 8f34ee7 | 2006-06-13 09:02:34 +0200 | [diff] [blame] | 188 | struct gendisk *rq_disk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 189 | unsigned long start_time; |
| 190 | |
| 191 | /* Number of scatter-gather DMA addr+len pairs after |
| 192 | * physical address coalescing is performed. |
| 193 | */ |
| 194 | unsigned short nr_phys_segments; |
| 195 | |
Jens Axboe | 8f34ee7 | 2006-06-13 09:02:34 +0200 | [diff] [blame] | 196 | unsigned short ioprio; |
| 197 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 198 | void *special; |
Jens Axboe | 8f34ee7 | 2006-06-13 09:02:34 +0200 | [diff] [blame] | 199 | char *buffer; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 200 | |
Jens Axboe | cdd6026 | 2006-07-28 09:32:07 +0200 | [diff] [blame] | 201 | int tag; |
| 202 | int errors; |
| 203 | |
| 204 | int ref_count; |
| 205 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 206 | /* |
| 207 | * when request is used as a packet command carrier |
| 208 | */ |
FUJITA Tomonori | d7e3c32 | 2008-04-29 09:54:39 +0200 | [diff] [blame] | 209 | unsigned short cmd_len; |
| 210 | unsigned char __cmd[BLK_MAX_CDB]; |
| 211 | unsigned char *cmd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | |
| 213 | unsigned int data_len; |
FUJITA Tomonori | 7a85f88 | 2008-03-04 11:17:11 +0100 | [diff] [blame] | 214 | unsigned int extra_len; /* length of alignment and padding */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 215 | unsigned int sense_len; |
Jens Axboe | 8f34ee7 | 2006-06-13 09:02:34 +0200 | [diff] [blame] | 216 | void *data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 217 | void *sense; |
| 218 | |
Jens Axboe | 242f9dc | 2008-09-14 05:55:09 -0700 | [diff] [blame] | 219 | unsigned long deadline; |
| 220 | struct list_head timeout_list; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 221 | unsigned int timeout; |
Mike Christie | 17e01f2 | 2005-11-11 05:31:37 -0600 | [diff] [blame] | 222 | int retries; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 223 | |
| 224 | /* |
Jens Axboe | c00895a | 2006-09-30 20:29:12 +0200 | [diff] [blame] | 225 | * completion callback. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 226 | */ |
| 227 | rq_end_io_fn *end_io; |
| 228 | void *end_io_data; |
FUJITA Tomonori | abae1fd | 2007-07-16 08:52:14 +0200 | [diff] [blame] | 229 | |
| 230 | /* for bidi */ |
| 231 | struct request *next_rq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 232 | }; |
| 233 | |
Fernando Luis Vázquez Cao | 766ca44 | 2008-08-14 09:59:13 +0200 | [diff] [blame] | 234 | static inline unsigned short req_get_ioprio(struct request *req) |
| 235 | { |
| 236 | return req->ioprio; |
| 237 | } |
| 238 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 239 | /* |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 240 | * 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] | 241 | * requests. Some step values could eventually be made generic. |
| 242 | */ |
| 243 | struct request_pm_state |
| 244 | { |
| 245 | /* PM state machine step value, currently driver specific */ |
| 246 | int pm_step; |
| 247 | /* requested PM state value (S1, S2, S3, S4, ...) */ |
| 248 | u32 pm_state; |
| 249 | void* data; /* for driver use */ |
| 250 | }; |
| 251 | |
| 252 | #include <linux/elevator.h> |
| 253 | |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 254 | typedef void (request_fn_proc) (struct request_queue *q); |
| 255 | typedef int (make_request_fn) (struct request_queue *q, struct bio *bio); |
| 256 | typedef int (prep_rq_fn) (struct request_queue *, struct request *); |
| 257 | typedef void (unplug_fn) (struct request_queue *); |
David Woodhouse | fb2dce8 | 2008-08-05 18:01:53 +0100 | [diff] [blame] | 258 | typedef int (prepare_discard_fn) (struct request_queue *, struct request *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 259 | |
| 260 | struct bio_vec; |
Alasdair G Kergon | cc371e6 | 2008-07-03 09:53:43 +0200 | [diff] [blame] | 261 | struct bvec_merge_data { |
| 262 | struct block_device *bi_bdev; |
| 263 | sector_t bi_sector; |
| 264 | unsigned bi_size; |
| 265 | unsigned long bi_rw; |
| 266 | }; |
| 267 | typedef int (merge_bvec_fn) (struct request_queue *, struct bvec_merge_data *, |
| 268 | struct bio_vec *); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 269 | typedef void (prepare_flush_fn) (struct request_queue *, struct request *); |
Jens Axboe | ff856ba | 2006-01-09 16:02:34 +0100 | [diff] [blame] | 270 | typedef void (softirq_done_fn)(struct request *); |
Tejun Heo | 2fb98e8 | 2008-02-19 11:36:53 +0100 | [diff] [blame] | 271 | typedef int (dma_drain_needed_fn)(struct request *); |
Kiyoshi Ueda | ef9e3fa | 2008-10-01 16:12:15 +0200 | [diff] [blame] | 272 | typedef int (lld_busy_fn) (struct request_queue *q); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 273 | |
Jens Axboe | 242f9dc | 2008-09-14 05:55:09 -0700 | [diff] [blame] | 274 | enum blk_eh_timer_return { |
| 275 | BLK_EH_NOT_HANDLED, |
| 276 | BLK_EH_HANDLED, |
| 277 | BLK_EH_RESET_TIMER, |
| 278 | }; |
| 279 | |
| 280 | typedef enum blk_eh_timer_return (rq_timed_out_fn)(struct request *); |
| 281 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 282 | enum blk_queue_state { |
| 283 | Queue_down, |
| 284 | Queue_up, |
| 285 | }; |
| 286 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 287 | struct blk_queue_tag { |
| 288 | struct request **tag_index; /* map of busy tags */ |
| 289 | unsigned long *tag_map; /* bit map of free/busy tags */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 290 | int busy; /* current depth */ |
| 291 | int max_depth; /* what we will send to device */ |
Tejun Heo | ba02508 | 2005-08-05 13:28:11 -0700 | [diff] [blame] | 292 | int real_max_depth; /* what the array can hold */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 293 | atomic_t refcnt; /* map can be shared */ |
| 294 | }; |
| 295 | |
FUJITA Tomonori | abf5439 | 2008-08-16 14:10:05 +0900 | [diff] [blame] | 296 | #define BLK_SCSI_MAX_CMDS (256) |
| 297 | #define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8)) |
| 298 | |
FUJITA Tomonori | 4beab5c | 2008-07-26 18:03:25 +0900 | [diff] [blame] | 299 | struct blk_cmd_filter { |
FUJITA Tomonori | abf5439 | 2008-08-16 14:10:05 +0900 | [diff] [blame] | 300 | unsigned long read_ok[BLK_SCSI_CMD_PER_LONG]; |
| 301 | unsigned long write_ok[BLK_SCSI_CMD_PER_LONG]; |
| 302 | struct kobject kobj; |
| 303 | }; |
| 304 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 305 | struct request_queue |
| 306 | { |
| 307 | /* |
| 308 | * Together with queue_head for cacheline sharing |
| 309 | */ |
| 310 | struct list_head queue_head; |
| 311 | struct request *last_merge; |
| 312 | elevator_t *elevator; |
| 313 | |
| 314 | /* |
| 315 | * the queue request freelist, one for reads and one for writes |
| 316 | */ |
| 317 | struct request_list rq; |
| 318 | |
| 319 | request_fn_proc *request_fn; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 320 | make_request_fn *make_request_fn; |
| 321 | prep_rq_fn *prep_rq_fn; |
| 322 | unplug_fn *unplug_fn; |
David Woodhouse | fb2dce8 | 2008-08-05 18:01:53 +0100 | [diff] [blame] | 323 | prepare_discard_fn *prepare_discard_fn; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 324 | merge_bvec_fn *merge_bvec_fn; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 325 | prepare_flush_fn *prepare_flush_fn; |
Jens Axboe | ff856ba | 2006-01-09 16:02:34 +0100 | [diff] [blame] | 326 | softirq_done_fn *softirq_done_fn; |
Jens Axboe | 242f9dc | 2008-09-14 05:55:09 -0700 | [diff] [blame] | 327 | rq_timed_out_fn *rq_timed_out_fn; |
Tejun Heo | 2fb98e8 | 2008-02-19 11:36:53 +0100 | [diff] [blame] | 328 | dma_drain_needed_fn *dma_drain_needed; |
Kiyoshi Ueda | ef9e3fa | 2008-10-01 16:12:15 +0200 | [diff] [blame] | 329 | lld_busy_fn *lld_busy_fn; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 330 | |
| 331 | /* |
Tejun Heo | 8922e16 | 2005-10-20 16:23:44 +0200 | [diff] [blame] | 332 | * Dispatch queue sorting |
| 333 | */ |
Jens Axboe | 1b47f53 | 2005-10-20 16:37:00 +0200 | [diff] [blame] | 334 | sector_t end_sector; |
Tejun Heo | 8922e16 | 2005-10-20 16:23:44 +0200 | [diff] [blame] | 335 | struct request *boundary_rq; |
Tejun Heo | 8922e16 | 2005-10-20 16:23:44 +0200 | [diff] [blame] | 336 | |
| 337 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 338 | * Auto-unplugging state |
| 339 | */ |
| 340 | struct timer_list unplug_timer; |
| 341 | int unplug_thresh; /* After this many requests */ |
| 342 | unsigned long unplug_delay; /* After this many jiffies */ |
| 343 | struct work_struct unplug_work; |
| 344 | |
| 345 | struct backing_dev_info backing_dev_info; |
| 346 | |
| 347 | /* |
| 348 | * The queue owner gets to use this for whatever they like. |
| 349 | * ll_rw_blk doesn't touch it. |
| 350 | */ |
| 351 | void *queuedata; |
| 352 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 353 | /* |
| 354 | * queue needs bounce pages for pages above this limit |
| 355 | */ |
| 356 | unsigned long bounce_pfn; |
Al Viro | 8267e26 | 2005-10-21 03:20:53 -0400 | [diff] [blame] | 357 | gfp_t bounce_gfp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | |
| 359 | /* |
| 360 | * various queue flags, see QUEUE_* below |
| 361 | */ |
| 362 | unsigned long queue_flags; |
| 363 | |
| 364 | /* |
| 152587d | 2005-04-12 16:22:06 -0500 | [diff] [blame] | 365 | * protects queue structures from reentrancy. ->__queue_lock should |
| 366 | * _never_ be used directly, it is queue private. always use |
| 367 | * ->queue_lock. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 368 | */ |
| 152587d | 2005-04-12 16:22:06 -0500 | [diff] [blame] | 369 | spinlock_t __queue_lock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 370 | spinlock_t *queue_lock; |
| 371 | |
| 372 | /* |
| 373 | * queue kobject |
| 374 | */ |
| 375 | struct kobject kobj; |
| 376 | |
| 377 | /* |
| 378 | * queue settings |
| 379 | */ |
| 380 | unsigned long nr_requests; /* Max # of requests */ |
| 381 | unsigned int nr_congestion_on; |
| 382 | unsigned int nr_congestion_off; |
| 383 | unsigned int nr_batching; |
| 384 | |
Jens Axboe | 2cb2e14 | 2006-01-17 09:04:32 +0100 | [diff] [blame] | 385 | unsigned int max_sectors; |
| 386 | unsigned int max_hw_sectors; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 387 | unsigned short max_phys_segments; |
| 388 | unsigned short max_hw_segments; |
| 389 | unsigned short hardsect_size; |
| 390 | unsigned int max_segment_size; |
| 391 | |
| 392 | unsigned long seg_boundary_mask; |
James Bottomley | fa0ccd8 | 2008-01-10 11:30:36 -0600 | [diff] [blame] | 393 | void *dma_drain_buffer; |
| 394 | unsigned int dma_drain_size; |
Tejun Heo | e3790c7 | 2008-03-04 11:18:17 +0100 | [diff] [blame] | 395 | unsigned int dma_pad_mask; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 396 | unsigned int dma_alignment; |
| 397 | |
| 398 | struct blk_queue_tag *queue_tags; |
Jens Axboe | 6eca900 | 2007-10-25 10:14:47 +0200 | [diff] [blame] | 399 | struct list_head tag_busy_list; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 400 | |
Tejun Heo | 15853af | 2005-11-10 08:52:05 +0100 | [diff] [blame] | 401 | unsigned int nr_sorted; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 402 | unsigned int in_flight; |
| 403 | |
Jens Axboe | 242f9dc | 2008-09-14 05:55:09 -0700 | [diff] [blame] | 404 | unsigned int rq_timeout; |
| 405 | struct timer_list timeout; |
| 406 | struct list_head timeout_list; |
| 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 | /* |
| 418 | * reserved for flush operations |
| 419 | */ |
Tejun Heo | 797e7db | 2006-01-06 09:51:03 +0100 | [diff] [blame] | 420 | unsigned int ordered, next_ordered, ordseq; |
| 421 | int orderr, ordcolor; |
| 422 | struct request pre_flush_rq, bar_rq, post_flush_rq; |
| 423 | struct request *orig_bar_rq; |
Al Viro | 483f4af | 2006-03-18 18:34:37 -0500 | [diff] [blame] | 424 | |
| 425 | struct mutex sysfs_lock; |
FUJITA Tomonori | d351af0 | 2007-07-09 12:40:35 +0200 | [diff] [blame] | 426 | |
| 427 | #if defined(CONFIG_BLK_DEV_BSG) |
| 428 | struct bsg_class_device bsg_dev; |
| 429 | #endif |
FUJITA Tomonori | 4beab5c | 2008-07-26 18:03:25 +0900 | [diff] [blame] | 430 | struct blk_cmd_filter cmd_filter; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 431 | }; |
| 432 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 433 | #define QUEUE_FLAG_CLUSTER 0 /* cluster several segments into 1 */ |
| 434 | #define QUEUE_FLAG_QUEUED 1 /* uses generic tag queueing */ |
| 435 | #define QUEUE_FLAG_STOPPED 2 /* queue is stopped */ |
Qi Yong | 4e97182 | 2007-07-25 08:45:51 +0200 | [diff] [blame] | 436 | #define QUEUE_FLAG_READFULL 3 /* read queue has been filled */ |
| 437 | #define QUEUE_FLAG_WRITEFULL 4 /* write queue has been filled */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 438 | #define QUEUE_FLAG_DEAD 5 /* queue being torn down */ |
| 439 | #define QUEUE_FLAG_REENTER 6 /* Re-entrancy avoidance */ |
| 440 | #define QUEUE_FLAG_PLUGGED 7 /* queue is plugged */ |
Jens Axboe | 64521d1 | 2005-10-28 08:30:39 +0200 | [diff] [blame] | 441 | #define QUEUE_FLAG_ELVSWITCH 8 /* don't use elevator, just do FIFO */ |
FUJITA Tomonori | abae1fd | 2007-07-16 08:52:14 +0200 | [diff] [blame] | 442 | #define QUEUE_FLAG_BIDI 9 /* queue supports bidi requests */ |
Alan D. Brunelle | ac9fafa | 2008-04-29 14:44:19 +0200 | [diff] [blame] | 443 | #define QUEUE_FLAG_NOMERGES 10 /* disable merge attempts */ |
Jens Axboe | c7c22e4 | 2008-09-13 20:26:01 +0200 | [diff] [blame] | 444 | #define QUEUE_FLAG_SAME_COMP 11 /* force complete on same CPU */ |
Jens Axboe | 581d4e2 | 2008-09-14 05:56:33 -0700 | [diff] [blame] | 445 | #define QUEUE_FLAG_FAIL_IO 12 /* fake timeout */ |
Kiyoshi Ueda | 4ee5eaf | 2008-09-18 10:46:13 -0400 | [diff] [blame] | 446 | #define QUEUE_FLAG_STACKABLE 13 /* supports request stacking */ |
Jens Axboe | a68bbdd | 2008-09-24 13:03:33 +0200 | [diff] [blame] | 447 | #define QUEUE_FLAG_NONROT 14 /* non-rotational device (SSD) */ |
Tejun Heo | 797e7db | 2006-01-06 09:51:03 +0100 | [diff] [blame] | 448 | |
Linus Torvalds | 8f45c1a | 2008-04-29 10:16:38 -0700 | [diff] [blame] | 449 | static inline int queue_is_locked(struct request_queue *q) |
| 450 | { |
Jens Axboe | 7663c1e | 2008-04-29 21:31:27 +0200 | [diff] [blame] | 451 | #ifdef CONFIG_SMP |
Linus Torvalds | 8f45c1a | 2008-04-29 10:16:38 -0700 | [diff] [blame] | 452 | spinlock_t *lock = q->queue_lock; |
| 453 | return lock && spin_is_locked(lock); |
Jens Axboe | 7663c1e | 2008-04-29 21:31:27 +0200 | [diff] [blame] | 454 | #else |
| 455 | return 1; |
| 456 | #endif |
Linus Torvalds | 8f45c1a | 2008-04-29 10:16:38 -0700 | [diff] [blame] | 457 | } |
| 458 | |
Nick Piggin | 75ad23b | 2008-04-29 14:48:33 +0200 | [diff] [blame] | 459 | static inline void queue_flag_set_unlocked(unsigned int flag, |
| 460 | struct request_queue *q) |
| 461 | { |
| 462 | __set_bit(flag, &q->queue_flags); |
| 463 | } |
| 464 | |
Jens Axboe | e48ec69 | 2008-07-03 13:18:54 +0200 | [diff] [blame] | 465 | static inline int queue_flag_test_and_clear(unsigned int flag, |
| 466 | struct request_queue *q) |
| 467 | { |
| 468 | WARN_ON_ONCE(!queue_is_locked(q)); |
| 469 | |
| 470 | if (test_bit(flag, &q->queue_flags)) { |
| 471 | __clear_bit(flag, &q->queue_flags); |
| 472 | return 1; |
| 473 | } |
| 474 | |
| 475 | return 0; |
| 476 | } |
| 477 | |
| 478 | static inline int queue_flag_test_and_set(unsigned int flag, |
| 479 | struct request_queue *q) |
| 480 | { |
| 481 | WARN_ON_ONCE(!queue_is_locked(q)); |
| 482 | |
| 483 | if (!test_bit(flag, &q->queue_flags)) { |
| 484 | __set_bit(flag, &q->queue_flags); |
| 485 | return 0; |
| 486 | } |
| 487 | |
| 488 | return 1; |
| 489 | } |
| 490 | |
Nick Piggin | 75ad23b | 2008-04-29 14:48:33 +0200 | [diff] [blame] | 491 | static inline void queue_flag_set(unsigned int flag, struct request_queue *q) |
| 492 | { |
Linus Torvalds | 8f45c1a | 2008-04-29 10:16:38 -0700 | [diff] [blame] | 493 | WARN_ON_ONCE(!queue_is_locked(q)); |
Nick Piggin | 75ad23b | 2008-04-29 14:48:33 +0200 | [diff] [blame] | 494 | __set_bit(flag, &q->queue_flags); |
| 495 | } |
| 496 | |
| 497 | static inline void queue_flag_clear_unlocked(unsigned int flag, |
| 498 | struct request_queue *q) |
| 499 | { |
| 500 | __clear_bit(flag, &q->queue_flags); |
| 501 | } |
| 502 | |
| 503 | static inline void queue_flag_clear(unsigned int flag, struct request_queue *q) |
| 504 | { |
Linus Torvalds | 8f45c1a | 2008-04-29 10:16:38 -0700 | [diff] [blame] | 505 | WARN_ON_ONCE(!queue_is_locked(q)); |
Nick Piggin | 75ad23b | 2008-04-29 14:48:33 +0200 | [diff] [blame] | 506 | __clear_bit(flag, &q->queue_flags); |
| 507 | } |
| 508 | |
Tejun Heo | 797e7db | 2006-01-06 09:51:03 +0100 | [diff] [blame] | 509 | enum { |
| 510 | /* |
| 511 | * Hardbarrier is supported with one of the following methods. |
| 512 | * |
| 513 | * NONE : hardbarrier unsupported |
| 514 | * DRAIN : ordering by draining is enough |
| 515 | * DRAIN_FLUSH : ordering by draining w/ pre and post flushes |
| 516 | * DRAIN_FUA : ordering by draining w/ pre flush and FUA write |
| 517 | * TAG : ordering by tag is enough |
| 518 | * TAG_FLUSH : ordering by tag w/ pre and post flushes |
| 519 | * TAG_FUA : ordering by tag w/ pre flush and FUA write |
| 520 | */ |
| 521 | QUEUE_ORDERED_NONE = 0x00, |
| 522 | QUEUE_ORDERED_DRAIN = 0x01, |
| 523 | QUEUE_ORDERED_TAG = 0x02, |
| 524 | |
| 525 | QUEUE_ORDERED_PREFLUSH = 0x10, |
| 526 | QUEUE_ORDERED_POSTFLUSH = 0x20, |
| 527 | QUEUE_ORDERED_FUA = 0x40, |
| 528 | |
| 529 | QUEUE_ORDERED_DRAIN_FLUSH = QUEUE_ORDERED_DRAIN | |
| 530 | QUEUE_ORDERED_PREFLUSH | QUEUE_ORDERED_POSTFLUSH, |
| 531 | QUEUE_ORDERED_DRAIN_FUA = QUEUE_ORDERED_DRAIN | |
| 532 | QUEUE_ORDERED_PREFLUSH | QUEUE_ORDERED_FUA, |
| 533 | QUEUE_ORDERED_TAG_FLUSH = QUEUE_ORDERED_TAG | |
| 534 | QUEUE_ORDERED_PREFLUSH | QUEUE_ORDERED_POSTFLUSH, |
| 535 | QUEUE_ORDERED_TAG_FUA = QUEUE_ORDERED_TAG | |
| 536 | QUEUE_ORDERED_PREFLUSH | QUEUE_ORDERED_FUA, |
| 537 | |
| 538 | /* |
| 539 | * Ordered operation sequence |
| 540 | */ |
| 541 | QUEUE_ORDSEQ_STARTED = 0x01, /* flushing in progress */ |
| 542 | QUEUE_ORDSEQ_DRAIN = 0x02, /* waiting for the queue to be drained */ |
| 543 | QUEUE_ORDSEQ_PREFLUSH = 0x04, /* pre-flushing in progress */ |
| 544 | QUEUE_ORDSEQ_BAR = 0x08, /* original barrier req in progress */ |
| 545 | QUEUE_ORDSEQ_POSTFLUSH = 0x10, /* post-flushing in progress */ |
| 546 | QUEUE_ORDSEQ_DONE = 0x20, |
| 547 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 548 | |
| 549 | #define blk_queue_plugged(q) test_bit(QUEUE_FLAG_PLUGGED, &(q)->queue_flags) |
| 550 | #define blk_queue_tagged(q) test_bit(QUEUE_FLAG_QUEUED, &(q)->queue_flags) |
| 551 | #define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags) |
Alan D. Brunelle | ac9fafa | 2008-04-29 14:44:19 +0200 | [diff] [blame] | 552 | #define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags) |
Jens Axboe | a68bbdd | 2008-09-24 13:03:33 +0200 | [diff] [blame] | 553 | #define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags) |
Tejun Heo | 797e7db | 2006-01-06 09:51:03 +0100 | [diff] [blame] | 554 | #define blk_queue_flushing(q) ((q)->ordseq) |
Kiyoshi Ueda | 4ee5eaf | 2008-09-18 10:46:13 -0400 | [diff] [blame] | 555 | #define blk_queue_stackable(q) \ |
| 556 | test_bit(QUEUE_FLAG_STACKABLE, &(q)->queue_flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 557 | |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 558 | #define blk_fs_request(rq) ((rq)->cmd_type == REQ_TYPE_FS) |
| 559 | #define blk_pc_request(rq) ((rq)->cmd_type == REQ_TYPE_BLOCK_PC) |
| 560 | #define blk_special_request(rq) ((rq)->cmd_type == REQ_TYPE_SPECIAL) |
| 561 | #define blk_sense_request(rq) ((rq)->cmd_type == REQ_TYPE_SENSE) |
| 562 | |
| 563 | #define blk_noretry_request(rq) ((rq)->cmd_flags & REQ_FAILFAST) |
| 564 | #define blk_rq_started(rq) ((rq)->cmd_flags & REQ_STARTED) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 565 | |
David Woodhouse | e17fc0a | 2008-08-09 16:42:20 +0100 | [diff] [blame] | 566 | #define blk_account_rq(rq) (blk_rq_started(rq) && (blk_fs_request(rq) || blk_discard_rq(rq))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 567 | |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 568 | #define blk_pm_suspend_request(rq) ((rq)->cmd_type == REQ_TYPE_PM_SUSPEND) |
| 569 | #define blk_pm_resume_request(rq) ((rq)->cmd_type == REQ_TYPE_PM_RESUME) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 570 | #define blk_pm_request(rq) \ |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 571 | (blk_pm_suspend_request(rq) || blk_pm_resume_request(rq)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 572 | |
Jens Axboe | ab780f1 | 2008-08-26 10:25:02 +0200 | [diff] [blame] | 573 | #define blk_rq_cpu_valid(rq) ((rq)->cpu != -1) |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 574 | #define blk_sorted_rq(rq) ((rq)->cmd_flags & REQ_SORTED) |
| 575 | #define blk_barrier_rq(rq) ((rq)->cmd_flags & REQ_HARDBARRIER) |
| 576 | #define blk_fua_rq(rq) ((rq)->cmd_flags & REQ_FUA) |
David Woodhouse | fb2dce8 | 2008-08-05 18:01:53 +0100 | [diff] [blame] | 577 | #define blk_discard_rq(rq) ((rq)->cmd_flags & REQ_DISCARD) |
FUJITA Tomonori | abae1fd | 2007-07-16 08:52:14 +0200 | [diff] [blame] | 578 | #define blk_bidi_rq(rq) ((rq)->next_rq != NULL) |
Jens Axboe | bf2de6f | 2007-09-27 13:01:25 +0200 | [diff] [blame] | 579 | #define blk_empty_barrier(rq) (blk_barrier_rq(rq) && blk_fs_request(rq) && !(rq)->hard_nr_sectors) |
Kiyoshi Ueda | 336cdb4 | 2007-12-11 17:40:30 -0500 | [diff] [blame] | 580 | /* rq->queuelist of dequeued request must be list_empty() */ |
| 581 | #define blk_queued_rq(rq) (!list_empty(&(rq)->queuelist)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 582 | |
| 583 | #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist) |
| 584 | |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 585 | #define rq_data_dir(rq) ((rq)->cmd_flags & 1) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 586 | |
Jens Axboe | 9e2585a | 2006-07-28 09:26:13 +0200 | [diff] [blame] | 587 | /* |
| 588 | * We regard a request as sync, if it's a READ or a SYNC write. |
| 589 | */ |
| 590 | #define rq_is_sync(rq) (rq_data_dir((rq)) == READ || (rq)->cmd_flags & REQ_RW_SYNC) |
Jens Axboe | 5404bc7 | 2006-08-10 09:01:02 +0200 | [diff] [blame] | 591 | #define rq_is_meta(rq) ((rq)->cmd_flags & REQ_RW_META) |
Jens Axboe | 9e2585a | 2006-07-28 09:26:13 +0200 | [diff] [blame] | 592 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 593 | static inline int blk_queue_full(struct request_queue *q, int rw) |
| 594 | { |
| 595 | if (rw == READ) |
| 596 | return test_bit(QUEUE_FLAG_READFULL, &q->queue_flags); |
| 597 | return test_bit(QUEUE_FLAG_WRITEFULL, &q->queue_flags); |
| 598 | } |
| 599 | |
| 600 | static inline void blk_set_queue_full(struct request_queue *q, int rw) |
| 601 | { |
| 602 | if (rw == READ) |
Nick Piggin | 75ad23b | 2008-04-29 14:48:33 +0200 | [diff] [blame] | 603 | queue_flag_set(QUEUE_FLAG_READFULL, q); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 604 | else |
Nick Piggin | 75ad23b | 2008-04-29 14:48:33 +0200 | [diff] [blame] | 605 | queue_flag_set(QUEUE_FLAG_WRITEFULL, q); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 606 | } |
| 607 | |
| 608 | static inline void blk_clear_queue_full(struct request_queue *q, int rw) |
| 609 | { |
| 610 | if (rw == READ) |
Nick Piggin | 75ad23b | 2008-04-29 14:48:33 +0200 | [diff] [blame] | 611 | queue_flag_clear(QUEUE_FLAG_READFULL, q); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 612 | else |
Nick Piggin | 75ad23b | 2008-04-29 14:48:33 +0200 | [diff] [blame] | 613 | queue_flag_clear(QUEUE_FLAG_WRITEFULL, q); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 614 | } |
| 615 | |
| 616 | |
| 617 | /* |
| 618 | * mergeable request must not have _NOMERGE or _BARRIER bit set, nor may |
| 619 | * it already be started by driver. |
| 620 | */ |
| 621 | #define RQ_NOMERGE_FLAGS \ |
| 622 | (REQ_NOMERGE | REQ_STARTED | REQ_HARDBARRIER | REQ_SOFTBARRIER) |
| 623 | #define rq_mergeable(rq) \ |
David Woodhouse | e17fc0a | 2008-08-09 16:42:20 +0100 | [diff] [blame] | 624 | (!((rq)->cmd_flags & RQ_NOMERGE_FLAGS) && \ |
| 625 | (blk_discard_rq(rq) || blk_fs_request((rq)))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 626 | |
| 627 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 628 | * q->prep_rq_fn return values |
| 629 | */ |
| 630 | #define BLKPREP_OK 0 /* serve it */ |
| 631 | #define BLKPREP_KILL 1 /* fatal error, kill */ |
| 632 | #define BLKPREP_DEFER 2 /* leave on queue */ |
| 633 | |
| 634 | extern unsigned long blk_max_low_pfn, blk_max_pfn; |
| 635 | |
| 636 | /* |
| 637 | * standard bounce addresses: |
| 638 | * |
| 639 | * BLK_BOUNCE_HIGH : bounce all highmem pages |
| 640 | * BLK_BOUNCE_ANY : don't bounce anything |
| 641 | * BLK_BOUNCE_ISA : bounce pages above ISA DMA boundary |
| 642 | */ |
Andi Kleen | 2472892 | 2008-04-21 09:51:05 +0200 | [diff] [blame] | 643 | |
| 644 | #if BITS_PER_LONG == 32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 645 | #define BLK_BOUNCE_HIGH ((u64)blk_max_low_pfn << PAGE_SHIFT) |
Andi Kleen | 2472892 | 2008-04-21 09:51:05 +0200 | [diff] [blame] | 646 | #else |
| 647 | #define BLK_BOUNCE_HIGH -1ULL |
| 648 | #endif |
| 649 | #define BLK_BOUNCE_ANY (-1ULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 650 | #define BLK_BOUNCE_ISA (ISA_DMA_THRESHOLD) |
| 651 | |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 652 | /* |
| 653 | * default timeout for SG_IO if none specified |
| 654 | */ |
| 655 | #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ) |
| 656 | |
Christoph Lameter | 2a7326b | 2007-07-17 04:03:37 -0700 | [diff] [blame] | 657 | #ifdef CONFIG_BOUNCE |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 658 | extern int init_emergency_isa_pool(void); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 659 | extern void blk_queue_bounce(struct request_queue *q, struct bio **bio); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 660 | #else |
| 661 | static inline int init_emergency_isa_pool(void) |
| 662 | { |
| 663 | return 0; |
| 664 | } |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 665 | 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] | 666 | { |
| 667 | } |
| 668 | #endif /* CONFIG_MMU */ |
| 669 | |
FUJITA Tomonori | 152e283 | 2008-08-28 16:17:06 +0900 | [diff] [blame] | 670 | struct rq_map_data { |
| 671 | struct page **pages; |
| 672 | int page_order; |
| 673 | int nr_entries; |
| 674 | }; |
| 675 | |
NeilBrown | 5705f70 | 2007-09-25 12:35:59 +0200 | [diff] [blame] | 676 | struct req_iterator { |
| 677 | int i; |
| 678 | struct bio *bio; |
| 679 | }; |
| 680 | |
| 681 | /* This should not be used directly - use rq_for_each_segment */ |
| 682 | #define __rq_for_each_bio(_bio, rq) \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 683 | if ((rq->bio)) \ |
| 684 | for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next) |
| 685 | |
NeilBrown | 5705f70 | 2007-09-25 12:35:59 +0200 | [diff] [blame] | 686 | #define rq_for_each_segment(bvl, _rq, _iter) \ |
| 687 | __rq_for_each_bio(_iter.bio, _rq) \ |
| 688 | bio_for_each_segment(bvl, _iter.bio, _iter.i) |
| 689 | |
| 690 | #define rq_iter_last(rq, _iter) \ |
| 691 | (_iter.bio->bi_next == NULL && _iter.i == _iter.bio->bi_vcnt-1) |
| 692 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 693 | extern int blk_register_queue(struct gendisk *disk); |
| 694 | extern void blk_unregister_queue(struct gendisk *disk); |
| 695 | extern void register_disk(struct gendisk *dev); |
| 696 | extern void generic_make_request(struct bio *bio); |
FUJITA Tomonori | 2a4aa30 | 2008-04-29 09:54:36 +0200 | [diff] [blame] | 697 | extern void blk_rq_init(struct request_queue *q, struct request *rq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 698 | extern void blk_put_request(struct request *); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 699 | extern void __blk_put_request(struct request_queue *, struct request *); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 700 | extern struct request *blk_get_request(struct request_queue *, int, gfp_t); |
| 701 | extern void blk_insert_request(struct request_queue *, struct request *, int, void *); |
| 702 | extern void blk_requeue_request(struct request_queue *, struct request *); |
Kiyoshi Ueda | 82124d6 | 2008-09-18 10:45:38 -0400 | [diff] [blame] | 703 | 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] | 704 | extern int blk_lld_busy(struct request_queue *q); |
Kiyoshi Ueda | 82124d6 | 2008-09-18 10:45:38 -0400 | [diff] [blame] | 705 | extern int blk_insert_cloned_request(struct request_queue *q, |
| 706 | struct request *rq); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 707 | extern void blk_plug_device(struct request_queue *); |
Jens Axboe | 6c5e0c4 | 2008-08-01 20:31:32 +0200 | [diff] [blame] | 708 | extern void blk_plug_device_unlocked(struct request_queue *); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 709 | extern int blk_remove_plug(struct request_queue *); |
| 710 | extern void blk_recount_segments(struct request_queue *, struct bio *); |
FUJITA Tomonori | 45e79a3 | 2007-07-09 12:39:20 +0200 | [diff] [blame] | 711 | extern int scsi_cmd_ioctl(struct file *, struct request_queue *, |
| 712 | struct gendisk *, unsigned int, void __user *); |
Christoph Hellwig | 21b2f0c | 2006-03-22 17:52:04 +0100 | [diff] [blame] | 713 | extern int sg_scsi_ioctl(struct file *, struct request_queue *, |
| 714 | struct gendisk *, struct scsi_ioctl_command __user *); |
Andrew Morton | 3fcfab1 | 2006-10-19 23:28:16 -0700 | [diff] [blame] | 715 | |
| 716 | /* |
Jens Axboe | 1aa4f24 | 2006-12-19 08:33:11 +0100 | [diff] [blame] | 717 | * Temporary export, until SCSI gets fixed up. |
| 718 | */ |
NeilBrown | 3001ca7 | 2007-08-16 13:31:27 +0200 | [diff] [blame] | 719 | extern int blk_rq_append_bio(struct request_queue *q, struct request *rq, |
| 720 | struct bio *bio); |
Jens Axboe | 1aa4f24 | 2006-12-19 08:33:11 +0100 | [diff] [blame] | 721 | |
| 722 | /* |
Andrew Morton | 3fcfab1 | 2006-10-19 23:28:16 -0700 | [diff] [blame] | 723 | * A queue has just exitted congestion. Note this in the global counter of |
| 724 | * congested queues, and wake up anyone who was waiting for requests to be |
| 725 | * put back. |
| 726 | */ |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 727 | static inline void blk_clear_queue_congested(struct request_queue *q, int rw) |
Andrew Morton | 3fcfab1 | 2006-10-19 23:28:16 -0700 | [diff] [blame] | 728 | { |
| 729 | clear_bdi_congested(&q->backing_dev_info, rw); |
| 730 | } |
| 731 | |
| 732 | /* |
| 733 | * A queue has just entered congestion. Flag that in the queue's VM-visible |
| 734 | * state flags and increment the global gounter of congested queues. |
| 735 | */ |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 736 | static inline void blk_set_queue_congested(struct request_queue *q, int rw) |
Andrew Morton | 3fcfab1 | 2006-10-19 23:28:16 -0700 | [diff] [blame] | 737 | { |
| 738 | set_bdi_congested(&q->backing_dev_info, rw); |
| 739 | } |
| 740 | |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 741 | extern void blk_start_queue(struct request_queue *q); |
| 742 | extern void blk_stop_queue(struct request_queue *q); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 743 | extern void blk_sync_queue(struct request_queue *q); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 744 | extern void __blk_stop_queue(struct request_queue *q); |
Nick Piggin | 75ad23b | 2008-04-29 14:48:33 +0200 | [diff] [blame] | 745 | extern void __blk_run_queue(struct request_queue *); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 746 | extern void blk_run_queue(struct request_queue *); |
| 747 | extern void blk_start_queueing(struct request_queue *); |
FUJITA Tomonori | a3bce90 | 2008-08-28 16:17:05 +0900 | [diff] [blame] | 748 | extern int blk_rq_map_user(struct request_queue *, struct request *, |
FUJITA Tomonori | 152e283 | 2008-08-28 16:17:06 +0900 | [diff] [blame] | 749 | struct rq_map_data *, void __user *, unsigned long, |
| 750 | gfp_t); |
Jens Axboe | 8e5cfc4 | 2006-12-19 11:12:46 +0100 | [diff] [blame] | 751 | extern int blk_rq_unmap_user(struct bio *); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 752 | extern int blk_rq_map_kern(struct request_queue *, struct request *, void *, unsigned int, gfp_t); |
| 753 | extern int blk_rq_map_user_iov(struct request_queue *, struct request *, |
FUJITA Tomonori | 152e283 | 2008-08-28 16:17:06 +0900 | [diff] [blame] | 754 | struct rq_map_data *, struct sg_iovec *, int, |
| 755 | unsigned int, gfp_t); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 756 | extern int blk_execute_rq(struct request_queue *, struct gendisk *, |
James Bottomley | 994ca9a | 2005-06-20 14:11:09 +0200 | [diff] [blame] | 757 | struct request *, int); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 758 | extern void blk_execute_rq_nowait(struct request_queue *, struct gendisk *, |
Jens Axboe | 15fc858 | 2006-01-06 10:00:50 +0100 | [diff] [blame] | 759 | struct request *, int, rq_end_io_fn *); |
Alan D. Brunelle | 2ad8b1e | 2007-11-07 14:26:56 -0500 | [diff] [blame] | 760 | extern void blk_unplug(struct request_queue *q); |
Mike Christie | 6e39b69 | 2005-11-11 05:30:24 -0600 | [diff] [blame] | 761 | |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 762 | static inline struct request_queue *bdev_get_queue(struct block_device *bdev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 763 | { |
| 764 | return bdev->bd_disk->queue; |
| 765 | } |
| 766 | |
| 767 | static inline void blk_run_backing_dev(struct backing_dev_info *bdi, |
| 768 | struct page *page) |
| 769 | { |
| 770 | if (bdi && bdi->unplug_io_fn) |
| 771 | bdi->unplug_io_fn(bdi, page); |
| 772 | } |
| 773 | |
| 774 | static inline void blk_run_address_space(struct address_space *mapping) |
| 775 | { |
| 776 | if (mapping) |
| 777 | blk_run_backing_dev(mapping->backing_dev_info, NULL); |
| 778 | } |
| 779 | |
| 780 | /* |
Kiyoshi Ueda | 3bcddea | 2007-12-11 17:52:28 -0500 | [diff] [blame] | 781 | * blk_end_request() and friends. |
| 782 | * __blk_end_request() and end_request() must be called with |
| 783 | * the request queue spinlock acquired. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 784 | * |
| 785 | * Several drivers define their own end_request and call |
Kiyoshi Ueda | 3bcddea | 2007-12-11 17:52:28 -0500 | [diff] [blame] | 786 | * blk_end_request() for parts of the original function. |
| 787 | * This prevents code duplication in drivers. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 788 | */ |
Jens Axboe | 22b1321 | 2008-01-31 12:36:19 +0100 | [diff] [blame] | 789 | extern int blk_end_request(struct request *rq, int error, |
| 790 | unsigned int nr_bytes); |
| 791 | extern int __blk_end_request(struct request *rq, int error, |
| 792 | unsigned int nr_bytes); |
| 793 | extern int blk_end_bidi_request(struct request *rq, int error, |
| 794 | unsigned int nr_bytes, unsigned int bidi_bytes); |
Jens Axboe | a0cd128 | 2007-09-21 10:41:07 +0200 | [diff] [blame] | 795 | extern void end_request(struct request *, int); |
Jens Axboe | 22b1321 | 2008-01-31 12:36:19 +0100 | [diff] [blame] | 796 | extern int blk_end_request_callback(struct request *rq, int error, |
| 797 | unsigned int nr_bytes, |
| 798 | int (drv_callback)(struct request *)); |
Jens Axboe | ff856ba | 2006-01-09 16:02:34 +0100 | [diff] [blame] | 799 | extern void blk_complete_request(struct request *); |
Jens Axboe | 242f9dc | 2008-09-14 05:55:09 -0700 | [diff] [blame] | 800 | extern void __blk_complete_request(struct request *); |
| 801 | extern void blk_abort_request(struct request *); |
Mike Anderson | 11914a5 | 2008-09-13 20:31:27 +0200 | [diff] [blame] | 802 | extern void blk_abort_queue(struct request_queue *); |
Kiyoshi Ueda | 32fab44 | 2008-09-18 10:45:09 -0400 | [diff] [blame] | 803 | extern void blk_update_request(struct request *rq, int error, |
| 804 | unsigned int nr_bytes); |
Jens Axboe | ff856ba | 2006-01-09 16:02:34 +0100 | [diff] [blame] | 805 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 806 | /* |
Kiyoshi Ueda | 3b11313 | 2007-12-11 17:41:17 -0500 | [diff] [blame] | 807 | * blk_end_request() takes bytes instead of sectors as a complete size. |
| 808 | * blk_rq_bytes() returns bytes left to complete in the entire request. |
| 809 | * blk_rq_cur_bytes() returns bytes left to complete in the current segment. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 810 | */ |
Kiyoshi Ueda | 3b11313 | 2007-12-11 17:41:17 -0500 | [diff] [blame] | 811 | extern unsigned int blk_rq_bytes(struct request *rq); |
| 812 | extern unsigned int blk_rq_cur_bytes(struct request *rq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 813 | |
| 814 | static inline void blkdev_dequeue_request(struct request *req) |
| 815 | { |
Tejun Heo | 8922e16 | 2005-10-20 16:23:44 +0200 | [diff] [blame] | 816 | elv_dequeue_request(req->q, req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 817 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 818 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 819 | /* |
| 820 | * Access functions for manipulating queue properties |
| 821 | */ |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 822 | extern struct request_queue *blk_init_queue_node(request_fn_proc *rfn, |
Christoph Lameter | 1946089 | 2005-06-23 00:08:19 -0700 | [diff] [blame] | 823 | spinlock_t *lock, int node_id); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 824 | extern struct request_queue *blk_init_queue(request_fn_proc *, spinlock_t *); |
| 825 | extern void blk_cleanup_queue(struct request_queue *); |
| 826 | extern void blk_queue_make_request(struct request_queue *, make_request_fn *); |
| 827 | extern void blk_queue_bounce_limit(struct request_queue *, u64); |
| 828 | extern void blk_queue_max_sectors(struct request_queue *, unsigned int); |
| 829 | extern void blk_queue_max_phys_segments(struct request_queue *, unsigned short); |
| 830 | extern void blk_queue_max_hw_segments(struct request_queue *, unsigned short); |
| 831 | extern void blk_queue_max_segment_size(struct request_queue *, unsigned int); |
| 832 | extern void blk_queue_hardsect_size(struct request_queue *, unsigned short); |
| 833 | 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] | 834 | extern void blk_queue_dma_pad(struct request_queue *, unsigned int); |
FUJITA Tomonori | 27f8221 | 2008-07-04 09:30:03 +0200 | [diff] [blame] | 835 | extern void blk_queue_update_dma_pad(struct request_queue *, unsigned int); |
Tejun Heo | 2fb98e8 | 2008-02-19 11:36:53 +0100 | [diff] [blame] | 836 | extern int blk_queue_dma_drain(struct request_queue *q, |
| 837 | dma_drain_needed_fn *dma_drain_needed, |
| 838 | void *buf, unsigned int size); |
Kiyoshi Ueda | ef9e3fa | 2008-10-01 16:12:15 +0200 | [diff] [blame] | 839 | 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] | 840 | extern void blk_queue_segment_boundary(struct request_queue *, unsigned long); |
| 841 | extern void blk_queue_prep_rq(struct request_queue *, prep_rq_fn *pfn); |
| 842 | extern void blk_queue_merge_bvec(struct request_queue *, merge_bvec_fn *); |
| 843 | extern void blk_queue_dma_alignment(struct request_queue *, int); |
James Bottomley | 11c3e68 | 2007-12-31 16:37:00 -0600 | [diff] [blame] | 844 | extern void blk_queue_update_dma_alignment(struct request_queue *, int); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 845 | extern void blk_queue_softirq_done(struct request_queue *, softirq_done_fn *); |
David Woodhouse | fb2dce8 | 2008-08-05 18:01:53 +0100 | [diff] [blame] | 846 | extern void blk_queue_set_discard(struct request_queue *, prepare_discard_fn *); |
Jens Axboe | 242f9dc | 2008-09-14 05:55:09 -0700 | [diff] [blame] | 847 | extern void blk_queue_rq_timed_out(struct request_queue *, rq_timed_out_fn *); |
| 848 | extern void blk_queue_rq_timeout(struct request_queue *, unsigned int); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 849 | extern struct backing_dev_info *blk_get_backing_dev_info(struct block_device *bdev); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 850 | extern int blk_queue_ordered(struct request_queue *, unsigned, prepare_flush_fn *); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 851 | extern int blk_do_ordered(struct request_queue *, struct request **); |
| 852 | extern unsigned blk_ordered_cur_seq(struct request_queue *); |
Tejun Heo | 797e7db | 2006-01-06 09:51:03 +0100 | [diff] [blame] | 853 | extern unsigned blk_ordered_req_seq(struct request *); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 854 | extern void blk_ordered_complete_seq(struct request_queue *, unsigned, int); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 855 | |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 856 | extern int blk_rq_map_sg(struct request_queue *, struct request *, struct scatterlist *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 857 | extern void blk_dump_rq_flags(struct request *, char *); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 858 | extern void generic_unplug_device(struct request_queue *); |
| 859 | extern void __generic_unplug_device(struct request_queue *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 860 | extern long nr_blockdev_pages(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 861 | |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 862 | int blk_get_queue(struct request_queue *); |
| 863 | struct request_queue *blk_alloc_queue(gfp_t); |
| 864 | struct request_queue *blk_alloc_queue_node(gfp_t, int); |
| 865 | extern void blk_put_queue(struct request_queue *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 866 | |
| 867 | /* |
| 868 | * tag stuff |
| 869 | */ |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 870 | #define blk_rq_tagged(rq) ((rq)->cmd_flags & REQ_QUEUED) |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 871 | extern int blk_queue_start_tag(struct request_queue *, struct request *); |
| 872 | extern struct request *blk_queue_find_tag(struct request_queue *, int); |
| 873 | extern void blk_queue_end_tag(struct request_queue *, struct request *); |
| 874 | extern int blk_queue_init_tags(struct request_queue *, int, struct blk_queue_tag *); |
| 875 | extern void blk_queue_free_tags(struct request_queue *); |
| 876 | extern int blk_queue_resize_tags(struct request_queue *, int); |
| 877 | extern void blk_queue_invalidate_tags(struct request_queue *); |
James Bottomley | 492dfb4 | 2006-08-30 15:48:45 -0400 | [diff] [blame] | 878 | extern struct blk_queue_tag *blk_init_tags(int); |
| 879 | extern void blk_free_tags(struct blk_queue_tag *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 880 | |
David C Somayajulu | f583f49 | 2006-10-04 08:27:25 +0200 | [diff] [blame] | 881 | static inline struct request *blk_map_queue_find_tag(struct blk_queue_tag *bqt, |
| 882 | int tag) |
| 883 | { |
| 884 | if (unlikely(bqt == NULL || tag >= bqt->real_max_depth)) |
| 885 | return NULL; |
| 886 | return bqt->tag_index[tag]; |
| 887 | } |
| 888 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 889 | extern int blkdev_issue_flush(struct block_device *, sector_t *); |
Hugh Dickins | 3e6053d | 2008-09-11 10:57:55 +0200 | [diff] [blame] | 890 | extern int blkdev_issue_discard(struct block_device *, |
| 891 | sector_t sector, sector_t nr_sects, gfp_t); |
David Woodhouse | fb2dce8 | 2008-08-05 18:01:53 +0100 | [diff] [blame] | 892 | |
| 893 | static inline int sb_issue_discard(struct super_block *sb, |
Hugh Dickins | 3e6053d | 2008-09-11 10:57:55 +0200 | [diff] [blame] | 894 | sector_t block, sector_t nr_blocks) |
David Woodhouse | fb2dce8 | 2008-08-05 18:01:53 +0100 | [diff] [blame] | 895 | { |
| 896 | block <<= (sb->s_blocksize_bits - 9); |
| 897 | nr_blocks <<= (sb->s_blocksize_bits - 9); |
Hugh Dickins | 3e6053d | 2008-09-11 10:57:55 +0200 | [diff] [blame] | 898 | return blkdev_issue_discard(sb->s_bdev, block, nr_blocks, GFP_KERNEL); |
David Woodhouse | fb2dce8 | 2008-08-05 18:01:53 +0100 | [diff] [blame] | 899 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 900 | |
Adel Gadllah | 0b07de8 | 2008-06-26 13:48:27 +0200 | [diff] [blame] | 901 | /* |
| 902 | * command filter functions |
| 903 | */ |
FUJITA Tomonori | 4beab5c | 2008-07-26 18:03:25 +0900 | [diff] [blame] | 904 | extern int blk_verify_command(struct blk_cmd_filter *filter, |
FUJITA Tomonori | abf5439 | 2008-08-16 14:10:05 +0900 | [diff] [blame] | 905 | unsigned char *cmd, int has_write_perm); |
FUJITA Tomonori | 4beab5c | 2008-07-26 18:03:25 +0900 | [diff] [blame] | 906 | extern void blk_set_cmd_filter_defaults(struct blk_cmd_filter *filter); |
Adel Gadllah | 0b07de8 | 2008-06-26 13:48:27 +0200 | [diff] [blame] | 907 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 908 | #define MAX_PHYS_SEGMENTS 128 |
| 909 | #define MAX_HW_SEGMENTS 128 |
Mike Christie | defd94b | 2005-12-05 02:37:06 -0600 | [diff] [blame] | 910 | #define SAFE_MAX_SECTORS 255 |
| 911 | #define BLK_DEF_MAX_SECTORS 1024 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 912 | |
| 913 | #define MAX_SEGMENT_SIZE 65536 |
| 914 | |
| 915 | #define blkdev_entry_to_request(entry) list_entry((entry), struct request, queuelist) |
| 916 | |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 917 | static inline int queue_hardsect_size(struct request_queue *q) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 918 | { |
| 919 | int retval = 512; |
| 920 | |
| 921 | if (q && q->hardsect_size) |
| 922 | retval = q->hardsect_size; |
| 923 | |
| 924 | return retval; |
| 925 | } |
| 926 | |
| 927 | static inline int bdev_hardsect_size(struct block_device *bdev) |
| 928 | { |
| 929 | return queue_hardsect_size(bdev_get_queue(bdev)); |
| 930 | } |
| 931 | |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 932 | static inline int queue_dma_alignment(struct request_queue *q) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 933 | { |
Pete Wyckoff | 482eb68 | 2008-01-01 10:23:02 -0500 | [diff] [blame] | 934 | return q ? q->dma_alignment : 511; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 935 | } |
| 936 | |
FUJITA Tomonori | 8790407 | 2008-08-28 15:05:58 +0900 | [diff] [blame] | 937 | static inline int blk_rq_aligned(struct request_queue *q, void *addr, |
| 938 | unsigned int len) |
| 939 | { |
| 940 | unsigned int alignment = queue_dma_alignment(q) | q->dma_pad_mask; |
| 941 | return !((unsigned long)addr & alignment) && !(len & alignment); |
| 942 | } |
| 943 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 944 | /* assumes size > 256 */ |
| 945 | static inline unsigned int blksize_bits(unsigned int size) |
| 946 | { |
| 947 | unsigned int bits = 8; |
| 948 | do { |
| 949 | bits++; |
| 950 | size >>= 1; |
| 951 | } while (size > 256); |
| 952 | return bits; |
| 953 | } |
| 954 | |
Adrian Bunk | 2befb9e | 2005-09-10 00:27:17 -0700 | [diff] [blame] | 955 | static inline unsigned int block_size(struct block_device *bdev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 956 | { |
| 957 | return bdev->bd_block_size; |
| 958 | } |
| 959 | |
| 960 | typedef struct {struct page *v;} Sector; |
| 961 | |
| 962 | unsigned char *read_dev_sector(struct block_device *, sector_t, Sector *); |
| 963 | |
| 964 | static inline void put_dev_sector(Sector p) |
| 965 | { |
| 966 | page_cache_release(p.v); |
| 967 | } |
| 968 | |
| 969 | struct work_struct; |
Jens Axboe | 18887ad | 2008-07-28 13:08:45 +0200 | [diff] [blame] | 970 | int kblockd_schedule_work(struct request_queue *q, struct work_struct *work); |
Andrew Morton | 19a75d8 | 2007-05-09 02:33:56 -0700 | [diff] [blame] | 971 | void kblockd_flush_work(struct work_struct *work); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 972 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 973 | #define MODULE_ALIAS_BLOCKDEV(major,minor) \ |
| 974 | MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor)) |
| 975 | #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \ |
| 976 | MODULE_ALIAS("block-major-" __stringify(major) "-*") |
| 977 | |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 978 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
| 979 | |
Jens Axboe | b24498d | 2008-06-27 09:12:09 +0200 | [diff] [blame] | 980 | #define INTEGRITY_FLAG_READ 2 /* verify data integrity on read */ |
| 981 | #define INTEGRITY_FLAG_WRITE 4 /* generate data integrity on write */ |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 982 | |
| 983 | struct blk_integrity_exchg { |
| 984 | void *prot_buf; |
| 985 | void *data_buf; |
| 986 | sector_t sector; |
| 987 | unsigned int data_size; |
| 988 | unsigned short sector_size; |
| 989 | const char *disk_name; |
| 990 | }; |
| 991 | |
| 992 | typedef void (integrity_gen_fn) (struct blk_integrity_exchg *); |
| 993 | typedef int (integrity_vrfy_fn) (struct blk_integrity_exchg *); |
| 994 | typedef void (integrity_set_tag_fn) (void *, void *, unsigned int); |
| 995 | typedef void (integrity_get_tag_fn) (void *, void *, unsigned int); |
| 996 | |
| 997 | struct blk_integrity { |
| 998 | integrity_gen_fn *generate_fn; |
| 999 | integrity_vrfy_fn *verify_fn; |
| 1000 | integrity_set_tag_fn *set_tag_fn; |
| 1001 | integrity_get_tag_fn *get_tag_fn; |
| 1002 | |
| 1003 | unsigned short flags; |
| 1004 | unsigned short tuple_size; |
| 1005 | unsigned short sector_size; |
| 1006 | unsigned short tag_size; |
| 1007 | |
| 1008 | const char *name; |
| 1009 | |
| 1010 | struct kobject kobj; |
| 1011 | }; |
| 1012 | |
| 1013 | extern int blk_integrity_register(struct gendisk *, struct blk_integrity *); |
| 1014 | extern void blk_integrity_unregister(struct gendisk *); |
| 1015 | extern int blk_integrity_compare(struct block_device *, struct block_device *); |
| 1016 | extern int blk_rq_map_integrity_sg(struct request *, struct scatterlist *); |
| 1017 | extern int blk_rq_count_integrity_sg(struct request *); |
| 1018 | |
Jens Axboe | b04accc | 2008-10-02 12:53:22 +0200 | [diff] [blame^] | 1019 | static inline |
| 1020 | struct blk_integrity *bdev_get_integrity(struct block_device *bdev) |
| 1021 | { |
| 1022 | return bdev->bd_disk->integrity; |
| 1023 | } |
| 1024 | |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 1025 | static inline int blk_integrity_rq(struct request *rq) |
| 1026 | { |
Martin K. Petersen | d442cc4 | 2008-07-16 16:09:06 -0400 | [diff] [blame] | 1027 | if (rq->bio == NULL) |
| 1028 | return 0; |
| 1029 | |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 1030 | return bio_integrity(rq->bio); |
| 1031 | } |
| 1032 | |
| 1033 | #else /* CONFIG_BLK_DEV_INTEGRITY */ |
| 1034 | |
| 1035 | #define blk_integrity_rq(rq) (0) |
| 1036 | #define blk_rq_count_integrity_sg(a) (0) |
| 1037 | #define blk_rq_map_integrity_sg(a, b) (0) |
Jens Axboe | b04accc | 2008-10-02 12:53:22 +0200 | [diff] [blame^] | 1038 | #define bdev_get_integrity(a) (0) |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 1039 | #define blk_integrity_compare(a, b) (0) |
| 1040 | #define blk_integrity_register(a, b) (0) |
| 1041 | #define blk_integrity_unregister(a) do { } while (0); |
| 1042 | |
| 1043 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ |
| 1044 | |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 1045 | #else /* CONFIG_BLOCK */ |
| 1046 | /* |
| 1047 | * stubs for when the block layer is configured out |
| 1048 | */ |
| 1049 | #define buffer_heads_over_limit 0 |
| 1050 | |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 1051 | static inline long nr_blockdev_pages(void) |
| 1052 | { |
| 1053 | return 0; |
| 1054 | } |
| 1055 | |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 1056 | #endif /* CONFIG_BLOCK */ |
| 1057 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1058 | #endif |