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; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | struct request_pm_state; |
Jens Axboe | 2056a78 | 2006-03-23 20:00:26 +0100 | [diff] [blame] | 30 | struct blk_trace; |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 31 | struct request; |
| 32 | struct sg_io_hdr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | |
| 34 | #define BLKDEV_MIN_RQ 4 |
| 35 | #define BLKDEV_MAX_RQ 128 /* Default maximum */ |
| 36 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | struct request; |
Tejun Heo | 8ffdc65 | 2006-01-06 09:49:03 +0100 | [diff] [blame] | 38 | typedef void (rq_end_io_fn)(struct request *, int); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | |
| 40 | struct request_list { |
Jens Axboe | 1faa16d | 2009-04-06 14:48:01 +0200 | [diff] [blame] | 41 | /* |
| 42 | * count[], starved[], and wait[] are indexed by |
| 43 | * BLK_RW_SYNC/BLK_RW_ASYNC |
| 44 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | int count[2]; |
| 46 | int starved[2]; |
Tejun Heo | cb98fc8 | 2005-10-28 08:29:39 +0200 | [diff] [blame] | 47 | int elvpriv; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | mempool_t *rq_pool; |
| 49 | wait_queue_head_t wait[2]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | }; |
| 51 | |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 52 | /* |
| 53 | * request command types |
| 54 | */ |
| 55 | enum rq_cmd_type_bits { |
| 56 | REQ_TYPE_FS = 1, /* fs request */ |
| 57 | REQ_TYPE_BLOCK_PC, /* scsi command */ |
| 58 | REQ_TYPE_SENSE, /* sense request */ |
| 59 | REQ_TYPE_PM_SUSPEND, /* suspend request */ |
| 60 | REQ_TYPE_PM_RESUME, /* resume request */ |
| 61 | REQ_TYPE_PM_SHUTDOWN, /* shutdown request */ |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 62 | REQ_TYPE_SPECIAL, /* driver defined type */ |
| 63 | REQ_TYPE_LINUX_BLOCK, /* generic block layer message */ |
| 64 | /* |
| 65 | * for ATA/ATAPI devices. this really doesn't belong here, ide should |
| 66 | * use REQ_TYPE_SPECIAL and use rq->cmd[0] with the range of driver |
| 67 | * private REQ_LB opcodes to differentiate what type of request this is |
| 68 | */ |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 69 | REQ_TYPE_ATA_TASKFILE, |
Jens Axboe | cea2885 | 2006-10-12 15:08:45 +0200 | [diff] [blame] | 70 | REQ_TYPE_ATA_PC, |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 71 | }; |
| 72 | |
| 73 | /* |
| 74 | * For request of type REQ_TYPE_LINUX_BLOCK, rq->cmd[0] is the opcode being |
| 75 | * sent down (similar to how REQ_TYPE_BLOCK_PC means that ->cmd[] holds a |
| 76 | * SCSI cdb. |
| 77 | * |
| 78 | * 0x00 -> 0x3f are driver private, to be used for whatever purpose they need, |
| 79 | * typically to differentiate REQ_TYPE_SPECIAL requests. |
| 80 | * |
| 81 | */ |
| 82 | enum { |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 83 | REQ_LB_OP_EJECT = 0x40, /* eject request */ |
David Woodhouse | 1a8e2bd | 2008-08-13 12:35:09 +0100 | [diff] [blame] | 84 | REQ_LB_OP_FLUSH = 0x41, /* flush request */ |
David Woodhouse | eae9acd | 2008-08-05 18:08:25 +0100 | [diff] [blame] | 85 | REQ_LB_OP_DISCARD = 0x42, /* discard sectors */ |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 86 | }; |
| 87 | |
| 88 | /* |
Jens Axboe | 1f98a13 | 2009-09-11 14:32:04 +0200 | [diff] [blame] | 89 | * request type modified bits. first four bits match BIO_RW* bits, important |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 90 | */ |
| 91 | enum rq_flag_bits { |
| 92 | __REQ_RW, /* not set, read. set, write */ |
Mike Christie | 6000a36 | 2008-08-19 18:45:30 -0500 | [diff] [blame] | 93 | __REQ_FAILFAST_DEV, /* no driver retries of device errors */ |
| 94 | __REQ_FAILFAST_TRANSPORT, /* no driver retries of transport errors */ |
| 95 | __REQ_FAILFAST_DRIVER, /* no driver retries of driver errors */ |
Tejun Heo | a82afdf | 2009-07-03 17:48:16 +0900 | [diff] [blame] | 96 | /* above flags must match BIO_RW_* */ |
David Woodhouse | fb2dce8 | 2008-08-05 18:01:53 +0100 | [diff] [blame] | 97 | __REQ_DISCARD, /* request to discard sectors */ |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 98 | __REQ_SORTED, /* elevator knows about this request */ |
| 99 | __REQ_SOFTBARRIER, /* may not be passed by ioscheduler */ |
| 100 | __REQ_HARDBARRIER, /* may not be passed by drive either */ |
| 101 | __REQ_FUA, /* forced unit access */ |
| 102 | __REQ_NOMERGE, /* don't touch this for merging */ |
| 103 | __REQ_STARTED, /* drive already may have started this one */ |
| 104 | __REQ_DONTPREP, /* don't call prep for this one */ |
| 105 | __REQ_QUEUED, /* uses queueing */ |
| 106 | __REQ_ELVPRIV, /* elevator private data attached */ |
| 107 | __REQ_FAILED, /* set if the request failed */ |
| 108 | __REQ_QUIET, /* don't worry about errors */ |
| 109 | __REQ_PREEMPT, /* set for "ide_preempt" requests */ |
| 110 | __REQ_ORDERED_COLOR, /* is before or after barrier */ |
Jens Axboe | 1faa16d | 2009-04-06 14:48:01 +0200 | [diff] [blame] | 111 | __REQ_RW_SYNC, /* request is sync (sync write or read) */ |
Jens Axboe | 49171e5 | 2006-08-10 08:59:11 +0200 | [diff] [blame] | 112 | __REQ_ALLOCED, /* request came from our alloc pool */ |
Jens Axboe | 5404bc7 | 2006-08-10 09:01:02 +0200 | [diff] [blame] | 113 | __REQ_RW_META, /* metadata io request */ |
FUJITA Tomonori | f18573a | 2008-04-11 12:56:52 +0200 | [diff] [blame] | 114 | __REQ_COPY_USER, /* contains copies of user pages */ |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 115 | __REQ_INTEGRITY, /* integrity metadata has been remapped */ |
Jens Axboe | aeb6faf | 2009-04-06 14:48:07 +0200 | [diff] [blame] | 116 | __REQ_NOIDLE, /* Don't anticipate more IO after this one */ |
Jerome Marchand | 42dad76 | 2009-04-22 14:01:49 +0200 | [diff] [blame] | 117 | __REQ_IO_STAT, /* account I/O stat */ |
Tejun Heo | 80a761f | 2009-07-03 17:48:17 +0900 | [diff] [blame] | 118 | __REQ_MIXED_MERGE, /* merge of different types, fail separately */ |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 119 | __REQ_NR_BITS, /* stops here */ |
| 120 | }; |
| 121 | |
| 122 | #define REQ_RW (1 << __REQ_RW) |
Mike Christie | 6000a36 | 2008-08-19 18:45:30 -0500 | [diff] [blame] | 123 | #define REQ_FAILFAST_DEV (1 << __REQ_FAILFAST_DEV) |
| 124 | #define REQ_FAILFAST_TRANSPORT (1 << __REQ_FAILFAST_TRANSPORT) |
| 125 | #define REQ_FAILFAST_DRIVER (1 << __REQ_FAILFAST_DRIVER) |
David Woodhouse | fb2dce8 | 2008-08-05 18:01:53 +0100 | [diff] [blame] | 126 | #define REQ_DISCARD (1 << __REQ_DISCARD) |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 127 | #define REQ_SORTED (1 << __REQ_SORTED) |
| 128 | #define REQ_SOFTBARRIER (1 << __REQ_SOFTBARRIER) |
| 129 | #define REQ_HARDBARRIER (1 << __REQ_HARDBARRIER) |
| 130 | #define REQ_FUA (1 << __REQ_FUA) |
| 131 | #define REQ_NOMERGE (1 << __REQ_NOMERGE) |
| 132 | #define REQ_STARTED (1 << __REQ_STARTED) |
| 133 | #define REQ_DONTPREP (1 << __REQ_DONTPREP) |
| 134 | #define REQ_QUEUED (1 << __REQ_QUEUED) |
| 135 | #define REQ_ELVPRIV (1 << __REQ_ELVPRIV) |
| 136 | #define REQ_FAILED (1 << __REQ_FAILED) |
| 137 | #define REQ_QUIET (1 << __REQ_QUIET) |
| 138 | #define REQ_PREEMPT (1 << __REQ_PREEMPT) |
| 139 | #define REQ_ORDERED_COLOR (1 << __REQ_ORDERED_COLOR) |
| 140 | #define REQ_RW_SYNC (1 << __REQ_RW_SYNC) |
Jens Axboe | 49171e5 | 2006-08-10 08:59:11 +0200 | [diff] [blame] | 141 | #define REQ_ALLOCED (1 << __REQ_ALLOCED) |
Jens Axboe | 5404bc7 | 2006-08-10 09:01:02 +0200 | [diff] [blame] | 142 | #define REQ_RW_META (1 << __REQ_RW_META) |
FUJITA Tomonori | f18573a | 2008-04-11 12:56:52 +0200 | [diff] [blame] | 143 | #define REQ_COPY_USER (1 << __REQ_COPY_USER) |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 144 | #define REQ_INTEGRITY (1 << __REQ_INTEGRITY) |
Jens Axboe | aeb6faf | 2009-04-06 14:48:07 +0200 | [diff] [blame] | 145 | #define REQ_NOIDLE (1 << __REQ_NOIDLE) |
Jerome Marchand | 42dad76 | 2009-04-22 14:01:49 +0200 | [diff] [blame] | 146 | #define REQ_IO_STAT (1 << __REQ_IO_STAT) |
Tejun Heo | 80a761f | 2009-07-03 17:48:17 +0900 | [diff] [blame] | 147 | #define REQ_MIXED_MERGE (1 << __REQ_MIXED_MERGE) |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 148 | |
Tejun Heo | a82afdf | 2009-07-03 17:48:16 +0900 | [diff] [blame] | 149 | #define REQ_FAILFAST_MASK (REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT | \ |
| 150 | REQ_FAILFAST_DRIVER) |
| 151 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | #define BLK_MAX_CDB 16 |
| 153 | |
| 154 | /* |
Jens Axboe | 63a7138 | 2008-02-08 12:41:03 +0100 | [diff] [blame] | 155 | * try to put the fields that are referenced together in the same cacheline. |
| 156 | * if you modify this structure, be sure to check block/blk-core.c:rq_init() |
| 157 | * as well! |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 158 | */ |
| 159 | struct request { |
Jens Axboe | ff856ba | 2006-01-09 16:02:34 +0100 | [diff] [blame] | 160 | struct list_head queuelist; |
Jens Axboe | c7c22e4 | 2008-09-13 20:26:01 +0200 | [diff] [blame] | 161 | struct call_single_data csd; |
| 162 | int cpu; |
Jens Axboe | ff856ba | 2006-01-09 16:02:34 +0100 | [diff] [blame] | 163 | |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 164 | struct request_queue *q; |
Jens Axboe | e6a1c87 | 2006-08-10 09:00:21 +0200 | [diff] [blame] | 165 | |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 166 | unsigned int cmd_flags; |
| 167 | enum rq_cmd_type_bits cmd_type; |
Jens Axboe | 242f9dc | 2008-09-14 05:55:09 -0700 | [diff] [blame] | 168 | unsigned long atomic_flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 169 | |
Tejun Heo | a2dec7b | 2009-05-07 22:24:44 +0900 | [diff] [blame] | 170 | /* the following two fields are internal, NEVER access directly */ |
| 171 | sector_t __sector; /* sector cursor */ |
| 172 | unsigned int __data_len; /* total data len */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | |
| 174 | struct bio *bio; |
| 175 | struct bio *biotail; |
| 176 | |
Jens Axboe | 9817064 | 2006-07-28 09:23:08 +0200 | [diff] [blame] | 177 | struct hlist_node hash; /* merge hash */ |
Jens Axboe | e6a1c87 | 2006-08-10 09:00:21 +0200 | [diff] [blame] | 178 | /* |
| 179 | * The rb_node is only used inside the io scheduler, requests |
| 180 | * are pruned when moved to the dispatch queue. So let the |
| 181 | * completion_data share space with the rb_node. |
| 182 | */ |
| 183 | union { |
| 184 | struct rb_node rb_node; /* sort/lookup */ |
| 185 | void *completion_data; |
| 186 | }; |
Jens Axboe | 9817064 | 2006-07-28 09:23:08 +0200 | [diff] [blame] | 187 | |
Jens Axboe | ff7d145 | 2006-07-12 14:04:37 +0200 | [diff] [blame] | 188 | /* |
| 189 | * two pointers are available for the IO schedulers, if they need |
| 190 | * more they have to dynamically allocate it. |
| 191 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 192 | void *elevator_private; |
Jens Axboe | ff7d145 | 2006-07-12 14:04:37 +0200 | [diff] [blame] | 193 | void *elevator_private2; |
| 194 | |
Jens Axboe | 8f34ee7 | 2006-06-13 09:02:34 +0200 | [diff] [blame] | 195 | struct gendisk *rq_disk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 196 | unsigned long start_time; |
| 197 | |
| 198 | /* Number of scatter-gather DMA addr+len pairs after |
| 199 | * physical address coalescing is performed. |
| 200 | */ |
| 201 | unsigned short nr_phys_segments; |
| 202 | |
Jens Axboe | 8f34ee7 | 2006-06-13 09:02:34 +0200 | [diff] [blame] | 203 | unsigned short ioprio; |
| 204 | |
Tejun Heo | 731ec49 | 2009-04-23 11:05:20 +0900 | [diff] [blame] | 205 | void *special; /* opaque pointer available for LLD use */ |
| 206 | char *buffer; /* kaddr of the current segment if available */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 207 | |
Jens Axboe | cdd6026 | 2006-07-28 09:32:07 +0200 | [diff] [blame] | 208 | int tag; |
| 209 | int errors; |
| 210 | |
| 211 | int ref_count; |
| 212 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 213 | /* |
| 214 | * when request is used as a packet command carrier |
| 215 | */ |
FUJITA Tomonori | d7e3c32 | 2008-04-29 09:54:39 +0200 | [diff] [blame] | 216 | unsigned short cmd_len; |
| 217 | unsigned char __cmd[BLK_MAX_CDB]; |
| 218 | unsigned char *cmd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 219 | |
FUJITA Tomonori | 7a85f88 | 2008-03-04 11:17:11 +0100 | [diff] [blame] | 220 | unsigned int extra_len; /* length of alignment and padding */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 221 | unsigned int sense_len; |
Tejun Heo | c3a4d78 | 2009-05-07 22:24:37 +0900 | [diff] [blame] | 222 | unsigned int resid_len; /* residual count */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 223 | void *sense; |
| 224 | |
Jens Axboe | 242f9dc | 2008-09-14 05:55:09 -0700 | [diff] [blame] | 225 | unsigned long deadline; |
| 226 | struct list_head timeout_list; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 227 | unsigned int timeout; |
Mike Christie | 17e01f2 | 2005-11-11 05:31:37 -0600 | [diff] [blame] | 228 | int retries; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 229 | |
| 230 | /* |
Jens Axboe | c00895a | 2006-09-30 20:29:12 +0200 | [diff] [blame] | 231 | * completion callback. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 232 | */ |
| 233 | rq_end_io_fn *end_io; |
| 234 | void *end_io_data; |
FUJITA Tomonori | abae1fd | 2007-07-16 08:52:14 +0200 | [diff] [blame] | 235 | |
| 236 | /* for bidi */ |
| 237 | struct request *next_rq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 238 | }; |
| 239 | |
Fernando Luis Vázquez Cao | 766ca44 | 2008-08-14 09:59:13 +0200 | [diff] [blame] | 240 | static inline unsigned short req_get_ioprio(struct request *req) |
| 241 | { |
| 242 | return req->ioprio; |
| 243 | } |
| 244 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 245 | /* |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 246 | * 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] | 247 | * requests. Some step values could eventually be made generic. |
| 248 | */ |
| 249 | struct request_pm_state |
| 250 | { |
| 251 | /* PM state machine step value, currently driver specific */ |
| 252 | int pm_step; |
| 253 | /* requested PM state value (S1, S2, S3, S4, ...) */ |
| 254 | u32 pm_state; |
| 255 | void* data; /* for driver use */ |
| 256 | }; |
| 257 | |
| 258 | #include <linux/elevator.h> |
| 259 | |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 260 | typedef void (request_fn_proc) (struct request_queue *q); |
| 261 | typedef int (make_request_fn) (struct request_queue *q, struct bio *bio); |
| 262 | typedef int (prep_rq_fn) (struct request_queue *, struct request *); |
| 263 | typedef void (unplug_fn) (struct request_queue *); |
David Woodhouse | fb2dce8 | 2008-08-05 18:01:53 +0100 | [diff] [blame] | 264 | typedef int (prepare_discard_fn) (struct request_queue *, struct request *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 265 | |
| 266 | struct bio_vec; |
Alasdair G Kergon | cc371e6 | 2008-07-03 09:53:43 +0200 | [diff] [blame] | 267 | struct bvec_merge_data { |
| 268 | struct block_device *bi_bdev; |
| 269 | sector_t bi_sector; |
| 270 | unsigned bi_size; |
| 271 | unsigned long bi_rw; |
| 272 | }; |
| 273 | typedef int (merge_bvec_fn) (struct request_queue *, struct bvec_merge_data *, |
| 274 | struct bio_vec *); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 275 | typedef void (prepare_flush_fn) (struct request_queue *, struct request *); |
Jens Axboe | ff856ba | 2006-01-09 16:02:34 +0100 | [diff] [blame] | 276 | typedef void (softirq_done_fn)(struct request *); |
Tejun Heo | 2fb98e8 | 2008-02-19 11:36:53 +0100 | [diff] [blame] | 277 | typedef int (dma_drain_needed_fn)(struct request *); |
Kiyoshi Ueda | ef9e3fa | 2008-10-01 16:12:15 +0200 | [diff] [blame] | 278 | typedef int (lld_busy_fn) (struct request_queue *q); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 279 | |
Jens Axboe | 242f9dc | 2008-09-14 05:55:09 -0700 | [diff] [blame] | 280 | enum blk_eh_timer_return { |
| 281 | BLK_EH_NOT_HANDLED, |
| 282 | BLK_EH_HANDLED, |
| 283 | BLK_EH_RESET_TIMER, |
| 284 | }; |
| 285 | |
| 286 | typedef enum blk_eh_timer_return (rq_timed_out_fn)(struct request *); |
| 287 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 288 | enum blk_queue_state { |
| 289 | Queue_down, |
| 290 | Queue_up, |
| 291 | }; |
| 292 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 293 | struct blk_queue_tag { |
| 294 | struct request **tag_index; /* map of busy tags */ |
| 295 | unsigned long *tag_map; /* bit map of free/busy tags */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 296 | int busy; /* current depth */ |
| 297 | int max_depth; /* what we will send to device */ |
Tejun Heo | ba02508 | 2005-08-05 13:28:11 -0700 | [diff] [blame] | 298 | int real_max_depth; /* what the array can hold */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 299 | atomic_t refcnt; /* map can be shared */ |
| 300 | }; |
| 301 | |
FUJITA Tomonori | abf5439 | 2008-08-16 14:10:05 +0900 | [diff] [blame] | 302 | #define BLK_SCSI_MAX_CMDS (256) |
| 303 | #define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8)) |
| 304 | |
Martin K. Petersen | 025146e | 2009-05-22 17:17:51 -0400 | [diff] [blame] | 305 | struct queue_limits { |
| 306 | unsigned long bounce_pfn; |
| 307 | unsigned long seg_boundary_mask; |
| 308 | |
| 309 | unsigned int max_hw_sectors; |
| 310 | unsigned int max_sectors; |
| 311 | unsigned int max_segment_size; |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 312 | unsigned int physical_block_size; |
| 313 | unsigned int alignment_offset; |
| 314 | unsigned int io_min; |
| 315 | unsigned int io_opt; |
Martin K. Petersen | 025146e | 2009-05-22 17:17:51 -0400 | [diff] [blame] | 316 | |
| 317 | unsigned short logical_block_size; |
| 318 | unsigned short max_hw_segments; |
| 319 | unsigned short max_phys_segments; |
| 320 | |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 321 | unsigned char misaligned; |
Martin K. Petersen | 025146e | 2009-05-22 17:17:51 -0400 | [diff] [blame] | 322 | unsigned char no_cluster; |
| 323 | }; |
| 324 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 325 | struct request_queue |
| 326 | { |
| 327 | /* |
| 328 | * Together with queue_head for cacheline sharing |
| 329 | */ |
| 330 | struct list_head queue_head; |
| 331 | struct request *last_merge; |
Jens Axboe | b374d18 | 2008-10-31 10:05:07 +0100 | [diff] [blame] | 332 | struct elevator_queue *elevator; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 333 | |
| 334 | /* |
| 335 | * the queue request freelist, one for reads and one for writes |
| 336 | */ |
| 337 | struct request_list rq; |
| 338 | |
| 339 | request_fn_proc *request_fn; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 340 | make_request_fn *make_request_fn; |
| 341 | prep_rq_fn *prep_rq_fn; |
| 342 | unplug_fn *unplug_fn; |
David Woodhouse | fb2dce8 | 2008-08-05 18:01:53 +0100 | [diff] [blame] | 343 | prepare_discard_fn *prepare_discard_fn; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 344 | merge_bvec_fn *merge_bvec_fn; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 345 | prepare_flush_fn *prepare_flush_fn; |
Jens Axboe | ff856ba | 2006-01-09 16:02:34 +0100 | [diff] [blame] | 346 | softirq_done_fn *softirq_done_fn; |
Jens Axboe | 242f9dc | 2008-09-14 05:55:09 -0700 | [diff] [blame] | 347 | rq_timed_out_fn *rq_timed_out_fn; |
Tejun Heo | 2fb98e8 | 2008-02-19 11:36:53 +0100 | [diff] [blame] | 348 | dma_drain_needed_fn *dma_drain_needed; |
Kiyoshi Ueda | ef9e3fa | 2008-10-01 16:12:15 +0200 | [diff] [blame] | 349 | lld_busy_fn *lld_busy_fn; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 350 | |
| 351 | /* |
Tejun Heo | 8922e16 | 2005-10-20 16:23:44 +0200 | [diff] [blame] | 352 | * Dispatch queue sorting |
| 353 | */ |
Jens Axboe | 1b47f53 | 2005-10-20 16:37:00 +0200 | [diff] [blame] | 354 | sector_t end_sector; |
Tejun Heo | 8922e16 | 2005-10-20 16:23:44 +0200 | [diff] [blame] | 355 | struct request *boundary_rq; |
Tejun Heo | 8922e16 | 2005-10-20 16:23:44 +0200 | [diff] [blame] | 356 | |
| 357 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | * Auto-unplugging state |
| 359 | */ |
| 360 | struct timer_list unplug_timer; |
| 361 | int unplug_thresh; /* After this many requests */ |
| 362 | unsigned long unplug_delay; /* After this many jiffies */ |
| 363 | struct work_struct unplug_work; |
| 364 | |
| 365 | struct backing_dev_info backing_dev_info; |
| 366 | |
| 367 | /* |
| 368 | * The queue owner gets to use this for whatever they like. |
| 369 | * ll_rw_blk doesn't touch it. |
| 370 | */ |
| 371 | void *queuedata; |
| 372 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 373 | /* |
| 374 | * queue needs bounce pages for pages above this limit |
| 375 | */ |
Al Viro | 8267e26 | 2005-10-21 03:20:53 -0400 | [diff] [blame] | 376 | gfp_t bounce_gfp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 377 | |
| 378 | /* |
| 379 | * various queue flags, see QUEUE_* below |
| 380 | */ |
| 381 | unsigned long queue_flags; |
| 382 | |
| 383 | /* |
| 152587d | 2005-04-12 16:22:06 -0500 | [diff] [blame] | 384 | * protects queue structures from reentrancy. ->__queue_lock should |
| 385 | * _never_ be used directly, it is queue private. always use |
| 386 | * ->queue_lock. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 387 | */ |
| 152587d | 2005-04-12 16:22:06 -0500 | [diff] [blame] | 388 | spinlock_t __queue_lock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 389 | spinlock_t *queue_lock; |
| 390 | |
| 391 | /* |
| 392 | * queue kobject |
| 393 | */ |
| 394 | struct kobject kobj; |
| 395 | |
| 396 | /* |
| 397 | * queue settings |
| 398 | */ |
| 399 | unsigned long nr_requests; /* Max # of requests */ |
| 400 | unsigned int nr_congestion_on; |
| 401 | unsigned int nr_congestion_off; |
| 402 | unsigned int nr_batching; |
| 403 | |
James Bottomley | fa0ccd8 | 2008-01-10 11:30:36 -0600 | [diff] [blame] | 404 | void *dma_drain_buffer; |
| 405 | unsigned int dma_drain_size; |
Tejun Heo | e3790c7 | 2008-03-04 11:18:17 +0100 | [diff] [blame] | 406 | unsigned int dma_pad_mask; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 407 | unsigned int dma_alignment; |
| 408 | |
| 409 | struct blk_queue_tag *queue_tags; |
Jens Axboe | 6eca900 | 2007-10-25 10:14:47 +0200 | [diff] [blame] | 410 | struct list_head tag_busy_list; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 411 | |
Tejun Heo | 15853af | 2005-11-10 08:52:05 +0100 | [diff] [blame] | 412 | unsigned int nr_sorted; |
Jens Axboe | 0a7ae2f | 2009-05-20 08:54:31 +0200 | [diff] [blame] | 413 | unsigned int in_flight[2]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 414 | |
Jens Axboe | 242f9dc | 2008-09-14 05:55:09 -0700 | [diff] [blame] | 415 | unsigned int rq_timeout; |
| 416 | struct timer_list timeout; |
| 417 | struct list_head timeout_list; |
| 418 | |
Martin K. Petersen | 025146e | 2009-05-22 17:17:51 -0400 | [diff] [blame] | 419 | struct queue_limits limits; |
| 420 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 421 | /* |
| 422 | * sg stuff |
| 423 | */ |
| 424 | unsigned int sg_timeout; |
| 425 | unsigned int sg_reserved_size; |
Christoph Lameter | 1946089 | 2005-06-23 00:08:19 -0700 | [diff] [blame] | 426 | int node; |
Alexey Dobriyan | 6c5c934 | 2006-09-29 01:59:40 -0700 | [diff] [blame] | 427 | #ifdef CONFIG_BLK_DEV_IO_TRACE |
Jens Axboe | 2056a78 | 2006-03-23 20:00:26 +0100 | [diff] [blame] | 428 | struct blk_trace *blk_trace; |
Alexey Dobriyan | 6c5c934 | 2006-09-29 01:59:40 -0700 | [diff] [blame] | 429 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 430 | /* |
| 431 | * reserved for flush operations |
| 432 | */ |
Tejun Heo | 797e7db | 2006-01-06 09:51:03 +0100 | [diff] [blame] | 433 | unsigned int ordered, next_ordered, ordseq; |
| 434 | int orderr, ordcolor; |
| 435 | struct request pre_flush_rq, bar_rq, post_flush_rq; |
| 436 | struct request *orig_bar_rq; |
Al Viro | 483f4af | 2006-03-18 18:34:37 -0500 | [diff] [blame] | 437 | |
| 438 | struct mutex sysfs_lock; |
FUJITA Tomonori | d351af0 | 2007-07-09 12:40:35 +0200 | [diff] [blame] | 439 | |
| 440 | #if defined(CONFIG_BLK_DEV_BSG) |
| 441 | struct bsg_class_device bsg_dev; |
| 442 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 443 | }; |
| 444 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 445 | #define QUEUE_FLAG_CLUSTER 0 /* cluster several segments into 1 */ |
| 446 | #define QUEUE_FLAG_QUEUED 1 /* uses generic tag queueing */ |
| 447 | #define QUEUE_FLAG_STOPPED 2 /* queue is stopped */ |
Jens Axboe | 1faa16d | 2009-04-06 14:48:01 +0200 | [diff] [blame] | 448 | #define QUEUE_FLAG_SYNCFULL 3 /* read queue has been filled */ |
| 449 | #define QUEUE_FLAG_ASYNCFULL 4 /* write queue has been filled */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 450 | #define QUEUE_FLAG_DEAD 5 /* queue being torn down */ |
| 451 | #define QUEUE_FLAG_REENTER 6 /* Re-entrancy avoidance */ |
| 452 | #define QUEUE_FLAG_PLUGGED 7 /* queue is plugged */ |
Jens Axboe | 64521d1 | 2005-10-28 08:30:39 +0200 | [diff] [blame] | 453 | #define QUEUE_FLAG_ELVSWITCH 8 /* don't use elevator, just do FIFO */ |
FUJITA Tomonori | abae1fd | 2007-07-16 08:52:14 +0200 | [diff] [blame] | 454 | #define QUEUE_FLAG_BIDI 9 /* queue supports bidi requests */ |
Alan D. Brunelle | ac9fafa | 2008-04-29 14:44:19 +0200 | [diff] [blame] | 455 | #define QUEUE_FLAG_NOMERGES 10 /* disable merge attempts */ |
Jens Axboe | c7c22e4 | 2008-09-13 20:26:01 +0200 | [diff] [blame] | 456 | #define QUEUE_FLAG_SAME_COMP 11 /* force complete on same CPU */ |
Jens Axboe | 581d4e2 | 2008-09-14 05:56:33 -0700 | [diff] [blame] | 457 | #define QUEUE_FLAG_FAIL_IO 12 /* fake timeout */ |
Kiyoshi Ueda | 4ee5eaf | 2008-09-18 10:46:13 -0400 | [diff] [blame] | 458 | #define QUEUE_FLAG_STACKABLE 13 /* supports request stacking */ |
Jens Axboe | a68bbdd | 2008-09-24 13:03:33 +0200 | [diff] [blame] | 459 | #define QUEUE_FLAG_NONROT 14 /* non-rotational device (SSD) */ |
Fernando Luis Vázquez Cao | 88e740f | 2008-10-27 18:44:46 +0900 | [diff] [blame] | 460 | #define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */ |
Jens Axboe | bc58ba9 | 2009-01-23 10:54:44 +0100 | [diff] [blame] | 461 | #define QUEUE_FLAG_IO_STAT 15 /* do IO stats */ |
Jens Axboe | fb1e753 | 2009-07-30 08:18:24 +0200 | [diff] [blame] | 462 | #define QUEUE_FLAG_CQ 16 /* hardware does queuing */ |
Jens Axboe | bc58ba9 | 2009-01-23 10:54:44 +0100 | [diff] [blame] | 463 | |
| 464 | #define QUEUE_FLAG_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \ |
| 465 | (1 << QUEUE_FLAG_CLUSTER) | \ |
Jens Axboe | 01e97f6 | 2009-09-03 20:06:47 +0200 | [diff] [blame] | 466 | (1 << QUEUE_FLAG_STACKABLE) | \ |
| 467 | (1 << QUEUE_FLAG_SAME_COMP)) |
Tejun Heo | 797e7db | 2006-01-06 09:51:03 +0100 | [diff] [blame] | 468 | |
Linus Torvalds | 8f45c1a | 2008-04-29 10:16:38 -0700 | [diff] [blame] | 469 | static inline int queue_is_locked(struct request_queue *q) |
| 470 | { |
Jens Axboe | 7663c1e | 2008-04-29 21:31:27 +0200 | [diff] [blame] | 471 | #ifdef CONFIG_SMP |
Linus Torvalds | 8f45c1a | 2008-04-29 10:16:38 -0700 | [diff] [blame] | 472 | spinlock_t *lock = q->queue_lock; |
| 473 | return lock && spin_is_locked(lock); |
Jens Axboe | 7663c1e | 2008-04-29 21:31:27 +0200 | [diff] [blame] | 474 | #else |
| 475 | return 1; |
| 476 | #endif |
Linus Torvalds | 8f45c1a | 2008-04-29 10:16:38 -0700 | [diff] [blame] | 477 | } |
| 478 | |
Nick Piggin | 75ad23b | 2008-04-29 14:48:33 +0200 | [diff] [blame] | 479 | static inline void queue_flag_set_unlocked(unsigned int flag, |
| 480 | struct request_queue *q) |
| 481 | { |
| 482 | __set_bit(flag, &q->queue_flags); |
| 483 | } |
| 484 | |
Jens Axboe | e48ec69 | 2008-07-03 13:18:54 +0200 | [diff] [blame] | 485 | static inline int queue_flag_test_and_clear(unsigned int flag, |
| 486 | struct request_queue *q) |
| 487 | { |
| 488 | WARN_ON_ONCE(!queue_is_locked(q)); |
| 489 | |
| 490 | if (test_bit(flag, &q->queue_flags)) { |
| 491 | __clear_bit(flag, &q->queue_flags); |
| 492 | return 1; |
| 493 | } |
| 494 | |
| 495 | return 0; |
| 496 | } |
| 497 | |
| 498 | static inline int queue_flag_test_and_set(unsigned int flag, |
| 499 | struct request_queue *q) |
| 500 | { |
| 501 | WARN_ON_ONCE(!queue_is_locked(q)); |
| 502 | |
| 503 | if (!test_bit(flag, &q->queue_flags)) { |
| 504 | __set_bit(flag, &q->queue_flags); |
| 505 | return 0; |
| 506 | } |
| 507 | |
| 508 | return 1; |
| 509 | } |
| 510 | |
Nick Piggin | 75ad23b | 2008-04-29 14:48:33 +0200 | [diff] [blame] | 511 | static inline void queue_flag_set(unsigned int flag, struct request_queue *q) |
| 512 | { |
Linus Torvalds | 8f45c1a | 2008-04-29 10:16:38 -0700 | [diff] [blame] | 513 | WARN_ON_ONCE(!queue_is_locked(q)); |
Nick Piggin | 75ad23b | 2008-04-29 14:48:33 +0200 | [diff] [blame] | 514 | __set_bit(flag, &q->queue_flags); |
| 515 | } |
| 516 | |
| 517 | static inline void queue_flag_clear_unlocked(unsigned int flag, |
| 518 | struct request_queue *q) |
| 519 | { |
| 520 | __clear_bit(flag, &q->queue_flags); |
| 521 | } |
| 522 | |
Jens Axboe | 0a7ae2f | 2009-05-20 08:54:31 +0200 | [diff] [blame] | 523 | static inline int queue_in_flight(struct request_queue *q) |
| 524 | { |
| 525 | return q->in_flight[0] + q->in_flight[1]; |
| 526 | } |
| 527 | |
Nick Piggin | 75ad23b | 2008-04-29 14:48:33 +0200 | [diff] [blame] | 528 | static inline void queue_flag_clear(unsigned int flag, struct request_queue *q) |
| 529 | { |
Linus Torvalds | 8f45c1a | 2008-04-29 10:16:38 -0700 | [diff] [blame] | 530 | WARN_ON_ONCE(!queue_is_locked(q)); |
Nick Piggin | 75ad23b | 2008-04-29 14:48:33 +0200 | [diff] [blame] | 531 | __clear_bit(flag, &q->queue_flags); |
| 532 | } |
| 533 | |
Tejun Heo | 797e7db | 2006-01-06 09:51:03 +0100 | [diff] [blame] | 534 | enum { |
| 535 | /* |
| 536 | * Hardbarrier is supported with one of the following methods. |
| 537 | * |
| 538 | * NONE : hardbarrier unsupported |
| 539 | * DRAIN : ordering by draining is enough |
| 540 | * DRAIN_FLUSH : ordering by draining w/ pre and post flushes |
| 541 | * DRAIN_FUA : ordering by draining w/ pre flush and FUA write |
| 542 | * TAG : ordering by tag is enough |
| 543 | * TAG_FLUSH : ordering by tag w/ pre and post flushes |
| 544 | * TAG_FUA : ordering by tag w/ pre flush and FUA write |
| 545 | */ |
Tejun Heo | 313e429 | 2008-11-28 13:32:02 +0900 | [diff] [blame] | 546 | QUEUE_ORDERED_BY_DRAIN = 0x01, |
| 547 | QUEUE_ORDERED_BY_TAG = 0x02, |
| 548 | QUEUE_ORDERED_DO_PREFLUSH = 0x10, |
Tejun Heo | f671620 | 2008-11-28 13:32:04 +0900 | [diff] [blame] | 549 | QUEUE_ORDERED_DO_BAR = 0x20, |
Tejun Heo | 313e429 | 2008-11-28 13:32:02 +0900 | [diff] [blame] | 550 | QUEUE_ORDERED_DO_POSTFLUSH = 0x40, |
| 551 | QUEUE_ORDERED_DO_FUA = 0x80, |
Tejun Heo | 797e7db | 2006-01-06 09:51:03 +0100 | [diff] [blame] | 552 | |
Tejun Heo | 313e429 | 2008-11-28 13:32:02 +0900 | [diff] [blame] | 553 | QUEUE_ORDERED_NONE = 0x00, |
Tejun Heo | 797e7db | 2006-01-06 09:51:03 +0100 | [diff] [blame] | 554 | |
Tejun Heo | f671620 | 2008-11-28 13:32:04 +0900 | [diff] [blame] | 555 | QUEUE_ORDERED_DRAIN = QUEUE_ORDERED_BY_DRAIN | |
| 556 | QUEUE_ORDERED_DO_BAR, |
Tejun Heo | 313e429 | 2008-11-28 13:32:02 +0900 | [diff] [blame] | 557 | QUEUE_ORDERED_DRAIN_FLUSH = QUEUE_ORDERED_DRAIN | |
| 558 | QUEUE_ORDERED_DO_PREFLUSH | |
| 559 | QUEUE_ORDERED_DO_POSTFLUSH, |
| 560 | QUEUE_ORDERED_DRAIN_FUA = QUEUE_ORDERED_DRAIN | |
| 561 | QUEUE_ORDERED_DO_PREFLUSH | |
| 562 | QUEUE_ORDERED_DO_FUA, |
| 563 | |
Tejun Heo | f671620 | 2008-11-28 13:32:04 +0900 | [diff] [blame] | 564 | QUEUE_ORDERED_TAG = QUEUE_ORDERED_BY_TAG | |
| 565 | QUEUE_ORDERED_DO_BAR, |
Tejun Heo | 313e429 | 2008-11-28 13:32:02 +0900 | [diff] [blame] | 566 | QUEUE_ORDERED_TAG_FLUSH = QUEUE_ORDERED_TAG | |
| 567 | QUEUE_ORDERED_DO_PREFLUSH | |
| 568 | QUEUE_ORDERED_DO_POSTFLUSH, |
| 569 | QUEUE_ORDERED_TAG_FUA = QUEUE_ORDERED_TAG | |
| 570 | QUEUE_ORDERED_DO_PREFLUSH | |
| 571 | QUEUE_ORDERED_DO_FUA, |
Tejun Heo | 797e7db | 2006-01-06 09:51:03 +0100 | [diff] [blame] | 572 | |
| 573 | /* |
| 574 | * Ordered operation sequence |
| 575 | */ |
| 576 | QUEUE_ORDSEQ_STARTED = 0x01, /* flushing in progress */ |
| 577 | QUEUE_ORDSEQ_DRAIN = 0x02, /* waiting for the queue to be drained */ |
| 578 | QUEUE_ORDSEQ_PREFLUSH = 0x04, /* pre-flushing in progress */ |
| 579 | QUEUE_ORDSEQ_BAR = 0x08, /* original barrier req in progress */ |
| 580 | QUEUE_ORDSEQ_POSTFLUSH = 0x10, /* post-flushing in progress */ |
| 581 | QUEUE_ORDSEQ_DONE = 0x20, |
| 582 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 583 | |
| 584 | #define blk_queue_plugged(q) test_bit(QUEUE_FLAG_PLUGGED, &(q)->queue_flags) |
| 585 | #define blk_queue_tagged(q) test_bit(QUEUE_FLAG_QUEUED, &(q)->queue_flags) |
Jens Axboe | fb1e753 | 2009-07-30 08:18:24 +0200 | [diff] [blame] | 586 | #define blk_queue_queuing(q) test_bit(QUEUE_FLAG_CQ, &(q)->queue_flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 587 | #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] | 588 | #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] | 589 | #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] | 590 | #define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags) |
Tejun Heo | 797e7db | 2006-01-06 09:51:03 +0100 | [diff] [blame] | 591 | #define blk_queue_flushing(q) ((q)->ordseq) |
Kiyoshi Ueda | 4ee5eaf | 2008-09-18 10:46:13 -0400 | [diff] [blame] | 592 | #define blk_queue_stackable(q) \ |
| 593 | test_bit(QUEUE_FLAG_STACKABLE, &(q)->queue_flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 594 | |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 595 | #define blk_fs_request(rq) ((rq)->cmd_type == REQ_TYPE_FS) |
| 596 | #define blk_pc_request(rq) ((rq)->cmd_type == REQ_TYPE_BLOCK_PC) |
| 597 | #define blk_special_request(rq) ((rq)->cmd_type == REQ_TYPE_SPECIAL) |
| 598 | #define blk_sense_request(rq) ((rq)->cmd_type == REQ_TYPE_SENSE) |
| 599 | |
Mike Christie | 6000a36 | 2008-08-19 18:45:30 -0500 | [diff] [blame] | 600 | #define blk_failfast_dev(rq) ((rq)->cmd_flags & REQ_FAILFAST_DEV) |
| 601 | #define blk_failfast_transport(rq) ((rq)->cmd_flags & REQ_FAILFAST_TRANSPORT) |
| 602 | #define blk_failfast_driver(rq) ((rq)->cmd_flags & REQ_FAILFAST_DRIVER) |
| 603 | #define blk_noretry_request(rq) (blk_failfast_dev(rq) || \ |
| 604 | blk_failfast_transport(rq) || \ |
| 605 | blk_failfast_driver(rq)) |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 606 | #define blk_rq_started(rq) ((rq)->cmd_flags & REQ_STARTED) |
Jerome Marchand | 42dad76 | 2009-04-22 14:01:49 +0200 | [diff] [blame] | 607 | #define blk_rq_io_stat(rq) ((rq)->cmd_flags & REQ_IO_STAT) |
Borislav Petkov | 96c1674 | 2009-04-30 18:24:34 +0200 | [diff] [blame] | 608 | #define blk_rq_quiet(rq) ((rq)->cmd_flags & REQ_QUIET) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 609 | |
David Woodhouse | e17fc0a | 2008-08-09 16:42:20 +0100 | [diff] [blame] | 610 | #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] | 611 | |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 612 | #define blk_pm_suspend_request(rq) ((rq)->cmd_type == REQ_TYPE_PM_SUSPEND) |
| 613 | #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] | 614 | #define blk_pm_request(rq) \ |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 615 | (blk_pm_suspend_request(rq) || blk_pm_resume_request(rq)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 616 | |
Jens Axboe | ab780f1 | 2008-08-26 10:25:02 +0200 | [diff] [blame] | 617 | #define blk_rq_cpu_valid(rq) ((rq)->cpu != -1) |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 618 | #define blk_sorted_rq(rq) ((rq)->cmd_flags & REQ_SORTED) |
| 619 | #define blk_barrier_rq(rq) ((rq)->cmd_flags & REQ_HARDBARRIER) |
| 620 | #define blk_fua_rq(rq) ((rq)->cmd_flags & REQ_FUA) |
David Woodhouse | fb2dce8 | 2008-08-05 18:01:53 +0100 | [diff] [blame] | 621 | #define blk_discard_rq(rq) ((rq)->cmd_flags & REQ_DISCARD) |
FUJITA Tomonori | abae1fd | 2007-07-16 08:52:14 +0200 | [diff] [blame] | 622 | #define blk_bidi_rq(rq) ((rq)->next_rq != NULL) |
Kiyoshi Ueda | 336cdb4 | 2007-12-11 17:40:30 -0500 | [diff] [blame] | 623 | /* rq->queuelist of dequeued request must be list_empty() */ |
| 624 | #define blk_queued_rq(rq) (!list_empty(&(rq)->queuelist)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 625 | |
| 626 | #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist) |
| 627 | |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 628 | #define rq_data_dir(rq) ((rq)->cmd_flags & 1) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 629 | |
Jens Axboe | 9e2585a | 2006-07-28 09:26:13 +0200 | [diff] [blame] | 630 | /* |
Jens Axboe | 1faa16d | 2009-04-06 14:48:01 +0200 | [diff] [blame] | 631 | * 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] | 632 | */ |
Jens Axboe | 1faa16d | 2009-04-06 14:48:01 +0200 | [diff] [blame] | 633 | static inline bool rw_is_sync(unsigned int rw_flags) |
| 634 | { |
| 635 | return !(rw_flags & REQ_RW) || (rw_flags & REQ_RW_SYNC); |
| 636 | } |
| 637 | |
| 638 | static inline bool rq_is_sync(struct request *rq) |
| 639 | { |
| 640 | return rw_is_sync(rq->cmd_flags); |
| 641 | } |
| 642 | |
Jens Axboe | 5404bc7 | 2006-08-10 09:01:02 +0200 | [diff] [blame] | 643 | #define rq_is_meta(rq) ((rq)->cmd_flags & REQ_RW_META) |
Jens Axboe | aeb6faf | 2009-04-06 14:48:07 +0200 | [diff] [blame] | 644 | #define rq_noidle(rq) ((rq)->cmd_flags & REQ_NOIDLE) |
Jens Axboe | 9e2585a | 2006-07-28 09:26:13 +0200 | [diff] [blame] | 645 | |
Jens Axboe | 1faa16d | 2009-04-06 14:48:01 +0200 | [diff] [blame] | 646 | static inline int blk_queue_full(struct request_queue *q, int sync) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 647 | { |
Jens Axboe | 1faa16d | 2009-04-06 14:48:01 +0200 | [diff] [blame] | 648 | if (sync) |
| 649 | return test_bit(QUEUE_FLAG_SYNCFULL, &q->queue_flags); |
| 650 | return test_bit(QUEUE_FLAG_ASYNCFULL, &q->queue_flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 651 | } |
| 652 | |
Jens Axboe | 1faa16d | 2009-04-06 14:48:01 +0200 | [diff] [blame] | 653 | static inline void blk_set_queue_full(struct request_queue *q, int sync) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 654 | { |
Jens Axboe | 1faa16d | 2009-04-06 14:48:01 +0200 | [diff] [blame] | 655 | if (sync) |
| 656 | queue_flag_set(QUEUE_FLAG_SYNCFULL, q); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 657 | else |
Jens Axboe | 1faa16d | 2009-04-06 14:48:01 +0200 | [diff] [blame] | 658 | queue_flag_set(QUEUE_FLAG_ASYNCFULL, q); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 659 | } |
| 660 | |
Jens Axboe | 1faa16d | 2009-04-06 14:48:01 +0200 | [diff] [blame] | 661 | static inline void blk_clear_queue_full(struct request_queue *q, int sync) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 662 | { |
Jens Axboe | 1faa16d | 2009-04-06 14:48:01 +0200 | [diff] [blame] | 663 | if (sync) |
| 664 | queue_flag_clear(QUEUE_FLAG_SYNCFULL, q); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 665 | else |
Jens Axboe | 1faa16d | 2009-04-06 14:48:01 +0200 | [diff] [blame] | 666 | queue_flag_clear(QUEUE_FLAG_ASYNCFULL, q); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 667 | } |
| 668 | |
| 669 | |
| 670 | /* |
| 671 | * mergeable request must not have _NOMERGE or _BARRIER bit set, nor may |
| 672 | * it already be started by driver. |
| 673 | */ |
| 674 | #define RQ_NOMERGE_FLAGS \ |
| 675 | (REQ_NOMERGE | REQ_STARTED | REQ_HARDBARRIER | REQ_SOFTBARRIER) |
| 676 | #define rq_mergeable(rq) \ |
David Woodhouse | e17fc0a | 2008-08-09 16:42:20 +0100 | [diff] [blame] | 677 | (!((rq)->cmd_flags & RQ_NOMERGE_FLAGS) && \ |
| 678 | (blk_discard_rq(rq) || blk_fs_request((rq)))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 679 | |
| 680 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 681 | * q->prep_rq_fn return values |
| 682 | */ |
| 683 | #define BLKPREP_OK 0 /* serve it */ |
| 684 | #define BLKPREP_KILL 1 /* fatal error, kill */ |
| 685 | #define BLKPREP_DEFER 2 /* leave on queue */ |
| 686 | |
| 687 | extern unsigned long blk_max_low_pfn, blk_max_pfn; |
| 688 | |
| 689 | /* |
| 690 | * standard bounce addresses: |
| 691 | * |
| 692 | * BLK_BOUNCE_HIGH : bounce all highmem pages |
| 693 | * BLK_BOUNCE_ANY : don't bounce anything |
| 694 | * BLK_BOUNCE_ISA : bounce pages above ISA DMA boundary |
| 695 | */ |
Andi Kleen | 2472892 | 2008-04-21 09:51:05 +0200 | [diff] [blame] | 696 | |
| 697 | #if BITS_PER_LONG == 32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 698 | #define BLK_BOUNCE_HIGH ((u64)blk_max_low_pfn << PAGE_SHIFT) |
Andi Kleen | 2472892 | 2008-04-21 09:51:05 +0200 | [diff] [blame] | 699 | #else |
| 700 | #define BLK_BOUNCE_HIGH -1ULL |
| 701 | #endif |
| 702 | #define BLK_BOUNCE_ANY (-1ULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 703 | #define BLK_BOUNCE_ISA (ISA_DMA_THRESHOLD) |
| 704 | |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 705 | /* |
| 706 | * default timeout for SG_IO if none specified |
| 707 | */ |
| 708 | #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ) |
Linus Torvalds | f2f1fa7 | 2008-12-05 14:49:18 -0800 | [diff] [blame] | 709 | #define BLK_MIN_SG_TIMEOUT (7 * HZ) |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 710 | |
Christoph Lameter | 2a7326b | 2007-07-17 04:03:37 -0700 | [diff] [blame] | 711 | #ifdef CONFIG_BOUNCE |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 712 | extern int init_emergency_isa_pool(void); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 713 | extern void blk_queue_bounce(struct request_queue *q, struct bio **bio); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 714 | #else |
| 715 | static inline int init_emergency_isa_pool(void) |
| 716 | { |
| 717 | return 0; |
| 718 | } |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 719 | 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] | 720 | { |
| 721 | } |
| 722 | #endif /* CONFIG_MMU */ |
| 723 | |
FUJITA Tomonori | 152e283 | 2008-08-28 16:17:06 +0900 | [diff] [blame] | 724 | struct rq_map_data { |
| 725 | struct page **pages; |
| 726 | int page_order; |
| 727 | int nr_entries; |
FUJITA Tomonori | 56c451f | 2008-12-18 14:49:37 +0900 | [diff] [blame] | 728 | unsigned long offset; |
FUJITA Tomonori | 97ae77a | 2008-12-18 14:49:38 +0900 | [diff] [blame] | 729 | int null_mapped; |
FUJITA Tomonori | ecb554a | 2009-07-09 14:46:53 +0200 | [diff] [blame] | 730 | int from_user; |
FUJITA Tomonori | 152e283 | 2008-08-28 16:17:06 +0900 | [diff] [blame] | 731 | }; |
| 732 | |
NeilBrown | 5705f70 | 2007-09-25 12:35:59 +0200 | [diff] [blame] | 733 | struct req_iterator { |
| 734 | int i; |
| 735 | struct bio *bio; |
| 736 | }; |
| 737 | |
| 738 | /* This should not be used directly - use rq_for_each_segment */ |
Jens Axboe | 1e42807 | 2009-02-23 09:03:10 +0100 | [diff] [blame] | 739 | #define for_each_bio(_bio) \ |
| 740 | for (; _bio; _bio = _bio->bi_next) |
NeilBrown | 5705f70 | 2007-09-25 12:35:59 +0200 | [diff] [blame] | 741 | #define __rq_for_each_bio(_bio, rq) \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 742 | if ((rq->bio)) \ |
| 743 | for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next) |
| 744 | |
NeilBrown | 5705f70 | 2007-09-25 12:35:59 +0200 | [diff] [blame] | 745 | #define rq_for_each_segment(bvl, _rq, _iter) \ |
| 746 | __rq_for_each_bio(_iter.bio, _rq) \ |
| 747 | bio_for_each_segment(bvl, _iter.bio, _iter.i) |
| 748 | |
| 749 | #define rq_iter_last(rq, _iter) \ |
| 750 | (_iter.bio->bi_next == NULL && _iter.i == _iter.bio->bi_vcnt-1) |
| 751 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 752 | extern int blk_register_queue(struct gendisk *disk); |
| 753 | extern void blk_unregister_queue(struct gendisk *disk); |
| 754 | extern void register_disk(struct gendisk *dev); |
| 755 | extern void generic_make_request(struct bio *bio); |
FUJITA Tomonori | 2a4aa30 | 2008-04-29 09:54:36 +0200 | [diff] [blame] | 756 | extern void blk_rq_init(struct request_queue *q, struct request *rq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 757 | extern void blk_put_request(struct request *); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 758 | extern void __blk_put_request(struct request_queue *, struct request *); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 759 | extern struct request *blk_get_request(struct request_queue *, int, gfp_t); |
Boaz Harrosh | 79eb63e | 2009-05-17 18:57:15 +0300 | [diff] [blame] | 760 | extern struct request *blk_make_request(struct request_queue *, struct bio *, |
| 761 | gfp_t); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 762 | extern void blk_insert_request(struct request_queue *, struct request *, int, void *); |
| 763 | extern void blk_requeue_request(struct request_queue *, struct request *); |
Kiyoshi Ueda | 82124d6 | 2008-09-18 10:45:38 -0400 | [diff] [blame] | 764 | 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] | 765 | extern int blk_lld_busy(struct request_queue *q); |
Kiyoshi Ueda | b0fd271 | 2009-06-11 13:10:16 +0200 | [diff] [blame] | 766 | extern int blk_rq_prep_clone(struct request *rq, struct request *rq_src, |
| 767 | struct bio_set *bs, gfp_t gfp_mask, |
| 768 | int (*bio_ctr)(struct bio *, struct bio *, void *), |
| 769 | void *data); |
| 770 | extern void blk_rq_unprep_clone(struct request *rq); |
Kiyoshi Ueda | 82124d6 | 2008-09-18 10:45:38 -0400 | [diff] [blame] | 771 | extern int blk_insert_cloned_request(struct request_queue *q, |
| 772 | struct request *rq); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 773 | extern void blk_plug_device(struct request_queue *); |
Jens Axboe | 6c5e0c4 | 2008-08-01 20:31:32 +0200 | [diff] [blame] | 774 | extern void blk_plug_device_unlocked(struct request_queue *); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 775 | extern int blk_remove_plug(struct request_queue *); |
| 776 | extern void blk_recount_segments(struct request_queue *, struct bio *); |
Al Viro | 74f3c8a | 2007-08-27 15:38:10 -0400 | [diff] [blame] | 777 | extern int scsi_cmd_ioctl(struct request_queue *, struct gendisk *, fmode_t, |
| 778 | unsigned int, void __user *); |
Al Viro | e915e87 | 2008-09-02 17:16:41 -0400 | [diff] [blame] | 779 | extern int sg_scsi_ioctl(struct request_queue *, struct gendisk *, fmode_t, |
| 780 | struct scsi_ioctl_command __user *); |
Andrew Morton | 3fcfab1 | 2006-10-19 23:28:16 -0700 | [diff] [blame] | 781 | |
| 782 | /* |
| 783 | * A queue has just exitted congestion. Note this in the global counter of |
| 784 | * congested queues, and wake up anyone who was waiting for requests to be |
| 785 | * put back. |
| 786 | */ |
Jens Axboe | 8aa7e84 | 2009-07-09 14:52:32 +0200 | [diff] [blame] | 787 | 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] | 788 | { |
Jens Axboe | 8aa7e84 | 2009-07-09 14:52:32 +0200 | [diff] [blame] | 789 | clear_bdi_congested(&q->backing_dev_info, sync); |
Andrew Morton | 3fcfab1 | 2006-10-19 23:28:16 -0700 | [diff] [blame] | 790 | } |
| 791 | |
| 792 | /* |
| 793 | * A queue has just entered congestion. Flag that in the queue's VM-visible |
| 794 | * state flags and increment the global gounter of congested queues. |
| 795 | */ |
Jens Axboe | 8aa7e84 | 2009-07-09 14:52:32 +0200 | [diff] [blame] | 796 | 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] | 797 | { |
Jens Axboe | 8aa7e84 | 2009-07-09 14:52:32 +0200 | [diff] [blame] | 798 | set_bdi_congested(&q->backing_dev_info, sync); |
Andrew Morton | 3fcfab1 | 2006-10-19 23:28:16 -0700 | [diff] [blame] | 799 | } |
| 800 | |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 801 | extern void blk_start_queue(struct request_queue *q); |
| 802 | extern void blk_stop_queue(struct request_queue *q); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 803 | extern void blk_sync_queue(struct request_queue *q); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 804 | extern void __blk_stop_queue(struct request_queue *q); |
Nick Piggin | 75ad23b | 2008-04-29 14:48:33 +0200 | [diff] [blame] | 805 | extern void __blk_run_queue(struct request_queue *); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 806 | extern void blk_run_queue(struct request_queue *); |
FUJITA Tomonori | a3bce90 | 2008-08-28 16:17:05 +0900 | [diff] [blame] | 807 | extern int blk_rq_map_user(struct request_queue *, struct request *, |
FUJITA Tomonori | 152e283 | 2008-08-28 16:17:06 +0900 | [diff] [blame] | 808 | struct rq_map_data *, void __user *, unsigned long, |
| 809 | gfp_t); |
Jens Axboe | 8e5cfc4 | 2006-12-19 11:12:46 +0100 | [diff] [blame] | 810 | extern int blk_rq_unmap_user(struct bio *); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 811 | extern int blk_rq_map_kern(struct request_queue *, struct request *, void *, unsigned int, gfp_t); |
| 812 | extern int blk_rq_map_user_iov(struct request_queue *, struct request *, |
FUJITA Tomonori | 152e283 | 2008-08-28 16:17:06 +0900 | [diff] [blame] | 813 | struct rq_map_data *, struct sg_iovec *, int, |
| 814 | unsigned int, gfp_t); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 815 | extern int blk_execute_rq(struct request_queue *, struct gendisk *, |
James Bottomley | 994ca9a | 2005-06-20 14:11:09 +0200 | [diff] [blame] | 816 | struct request *, int); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 817 | extern void blk_execute_rq_nowait(struct request_queue *, struct gendisk *, |
Jens Axboe | 15fc858 | 2006-01-06 10:00:50 +0100 | [diff] [blame] | 818 | struct request *, int, rq_end_io_fn *); |
Alan D. Brunelle | 2ad8b1e | 2007-11-07 14:26:56 -0500 | [diff] [blame] | 819 | extern void blk_unplug(struct request_queue *q); |
Mike Christie | 6e39b69 | 2005-11-11 05:30:24 -0600 | [diff] [blame] | 820 | |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 821 | static inline struct request_queue *bdev_get_queue(struct block_device *bdev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 822 | { |
| 823 | return bdev->bd_disk->queue; |
| 824 | } |
| 825 | |
| 826 | static inline void blk_run_backing_dev(struct backing_dev_info *bdi, |
| 827 | struct page *page) |
| 828 | { |
| 829 | if (bdi && bdi->unplug_io_fn) |
| 830 | bdi->unplug_io_fn(bdi, page); |
| 831 | } |
| 832 | |
| 833 | static inline void blk_run_address_space(struct address_space *mapping) |
| 834 | { |
| 835 | if (mapping) |
| 836 | blk_run_backing_dev(mapping->backing_dev_info, NULL); |
| 837 | } |
| 838 | |
| 839 | /* |
Tejun Heo | 80a761f | 2009-07-03 17:48:17 +0900 | [diff] [blame] | 840 | * blk_rq_pos() : the current sector |
| 841 | * blk_rq_bytes() : bytes left in the entire request |
| 842 | * blk_rq_cur_bytes() : bytes left in the current segment |
| 843 | * blk_rq_err_bytes() : bytes left till the next error boundary |
| 844 | * blk_rq_sectors() : sectors left in the entire request |
| 845 | * blk_rq_cur_sectors() : sectors left in the current segment |
| 846 | * blk_rq_err_sectors() : sectors left till the next error boundary |
Tejun Heo | 5efccd1 | 2009-04-23 11:05:18 +0900 | [diff] [blame] | 847 | */ |
Tejun Heo | 5b93629 | 2009-05-07 22:24:38 +0900 | [diff] [blame] | 848 | static inline sector_t blk_rq_pos(const struct request *rq) |
| 849 | { |
Tejun Heo | a2dec7b | 2009-05-07 22:24:44 +0900 | [diff] [blame] | 850 | return rq->__sector; |
Tejun Heo | 5b93629 | 2009-05-07 22:24:38 +0900 | [diff] [blame] | 851 | } |
| 852 | |
Tejun Heo | 2e46e8b | 2009-05-07 22:24:41 +0900 | [diff] [blame] | 853 | static inline unsigned int blk_rq_bytes(const struct request *rq) |
| 854 | { |
Tejun Heo | a2dec7b | 2009-05-07 22:24:44 +0900 | [diff] [blame] | 855 | return rq->__data_len; |
Tejun Heo | 2e46e8b | 2009-05-07 22:24:41 +0900 | [diff] [blame] | 856 | } |
| 857 | |
| 858 | static inline int blk_rq_cur_bytes(const struct request *rq) |
| 859 | { |
| 860 | return rq->bio ? bio_cur_bytes(rq->bio) : 0; |
| 861 | } |
Tejun Heo | 5efccd1 | 2009-04-23 11:05:18 +0900 | [diff] [blame] | 862 | |
Tejun Heo | 80a761f | 2009-07-03 17:48:17 +0900 | [diff] [blame] | 863 | extern unsigned int blk_rq_err_bytes(const struct request *rq); |
| 864 | |
Tejun Heo | 5b93629 | 2009-05-07 22:24:38 +0900 | [diff] [blame] | 865 | static inline unsigned int blk_rq_sectors(const struct request *rq) |
| 866 | { |
Tejun Heo | 2e46e8b | 2009-05-07 22:24:41 +0900 | [diff] [blame] | 867 | return blk_rq_bytes(rq) >> 9; |
Tejun Heo | 5b93629 | 2009-05-07 22:24:38 +0900 | [diff] [blame] | 868 | } |
| 869 | |
| 870 | static inline unsigned int blk_rq_cur_sectors(const struct request *rq) |
| 871 | { |
Tejun Heo | 2e46e8b | 2009-05-07 22:24:41 +0900 | [diff] [blame] | 872 | return blk_rq_cur_bytes(rq) >> 9; |
Tejun Heo | 5b93629 | 2009-05-07 22:24:38 +0900 | [diff] [blame] | 873 | } |
| 874 | |
Tejun Heo | 80a761f | 2009-07-03 17:48:17 +0900 | [diff] [blame] | 875 | static inline unsigned int blk_rq_err_sectors(const struct request *rq) |
| 876 | { |
| 877 | return blk_rq_err_bytes(rq) >> 9; |
| 878 | } |
| 879 | |
Tejun Heo | 5efccd1 | 2009-04-23 11:05:18 +0900 | [diff] [blame] | 880 | /* |
Tejun Heo | 9934c8c | 2009-05-08 11:54:16 +0900 | [diff] [blame] | 881 | * Request issue related functions. |
| 882 | */ |
| 883 | extern struct request *blk_peek_request(struct request_queue *q); |
| 884 | extern void blk_start_request(struct request *rq); |
| 885 | extern struct request *blk_fetch_request(struct request_queue *q); |
| 886 | |
| 887 | /* |
Tejun Heo | 2e60e02 | 2009-04-23 11:05:18 +0900 | [diff] [blame] | 888 | * Request completion related functions. |
| 889 | * |
| 890 | * blk_update_request() completes given number of bytes and updates |
| 891 | * the request without completing it. |
| 892 | * |
Tejun Heo | f06d9a2 | 2009-04-23 11:05:19 +0900 | [diff] [blame] | 893 | * blk_end_request() and friends. __blk_end_request() must be called |
| 894 | * with the request queue spinlock acquired. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 895 | * |
| 896 | * Several drivers define their own end_request and call |
Kiyoshi Ueda | 3bcddea | 2007-12-11 17:52:28 -0500 | [diff] [blame] | 897 | * blk_end_request() for parts of the original function. |
| 898 | * This prevents code duplication in drivers. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 899 | */ |
Tejun Heo | 2e60e02 | 2009-04-23 11:05:18 +0900 | [diff] [blame] | 900 | extern bool blk_update_request(struct request *rq, int error, |
| 901 | unsigned int nr_bytes); |
FUJITA Tomonori | b1f7449 | 2009-05-11 17:56:09 +0900 | [diff] [blame] | 902 | extern bool blk_end_request(struct request *rq, int error, |
| 903 | unsigned int nr_bytes); |
| 904 | extern void blk_end_request_all(struct request *rq, int error); |
| 905 | extern bool blk_end_request_cur(struct request *rq, int error); |
Tejun Heo | 80a761f | 2009-07-03 17:48:17 +0900 | [diff] [blame] | 906 | extern bool blk_end_request_err(struct request *rq, int error); |
FUJITA Tomonori | b1f7449 | 2009-05-11 17:56:09 +0900 | [diff] [blame] | 907 | extern bool __blk_end_request(struct request *rq, int error, |
| 908 | unsigned int nr_bytes); |
| 909 | extern void __blk_end_request_all(struct request *rq, int error); |
| 910 | extern bool __blk_end_request_cur(struct request *rq, int error); |
Tejun Heo | 80a761f | 2009-07-03 17:48:17 +0900 | [diff] [blame] | 911 | extern bool __blk_end_request_err(struct request *rq, int error); |
Tejun Heo | 2e60e02 | 2009-04-23 11:05:18 +0900 | [diff] [blame] | 912 | |
Jens Axboe | ff856ba | 2006-01-09 16:02:34 +0100 | [diff] [blame] | 913 | extern void blk_complete_request(struct request *); |
Jens Axboe | 242f9dc | 2008-09-14 05:55:09 -0700 | [diff] [blame] | 914 | extern void __blk_complete_request(struct request *); |
| 915 | extern void blk_abort_request(struct request *); |
Mike Anderson | 11914a5 | 2008-09-13 20:31:27 +0200 | [diff] [blame] | 916 | extern void blk_abort_queue(struct request_queue *); |
Jens Axboe | ff856ba | 2006-01-09 16:02:34 +0100 | [diff] [blame] | 917 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 918 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 919 | * Access functions for manipulating queue properties |
| 920 | */ |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 921 | extern struct request_queue *blk_init_queue_node(request_fn_proc *rfn, |
Christoph Lameter | 1946089 | 2005-06-23 00:08:19 -0700 | [diff] [blame] | 922 | spinlock_t *lock, int node_id); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 923 | extern struct request_queue *blk_init_queue(request_fn_proc *, spinlock_t *); |
| 924 | extern void blk_cleanup_queue(struct request_queue *); |
| 925 | extern void blk_queue_make_request(struct request_queue *, make_request_fn *); |
| 926 | extern void blk_queue_bounce_limit(struct request_queue *, u64); |
| 927 | extern void blk_queue_max_sectors(struct request_queue *, unsigned int); |
Martin K. Petersen | ae03bf6 | 2009-05-22 17:17:50 -0400 | [diff] [blame] | 928 | extern void blk_queue_max_hw_sectors(struct request_queue *, unsigned int); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 929 | extern void blk_queue_max_phys_segments(struct request_queue *, unsigned short); |
| 930 | extern void blk_queue_max_hw_segments(struct request_queue *, unsigned short); |
| 931 | extern void blk_queue_max_segment_size(struct request_queue *, unsigned int); |
Martin K. Petersen | e1defc4 | 2009-05-22 17:17:49 -0400 | [diff] [blame] | 932 | extern void blk_queue_logical_block_size(struct request_queue *, unsigned short); |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 933 | extern void blk_queue_physical_block_size(struct request_queue *, unsigned short); |
| 934 | extern void blk_queue_alignment_offset(struct request_queue *q, |
| 935 | unsigned int alignment); |
Martin K. Petersen | 7c958e3 | 2009-07-31 11:49:11 -0400 | [diff] [blame] | 936 | 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] | 937 | 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^] | 938 | 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] | 939 | 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] | 940 | extern void blk_set_default_limits(struct queue_limits *lim); |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 941 | extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b, |
| 942 | sector_t offset); |
| 943 | extern void disk_stack_limits(struct gendisk *disk, struct block_device *bdev, |
| 944 | sector_t offset); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 945 | 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] | 946 | extern void blk_queue_dma_pad(struct request_queue *, unsigned int); |
FUJITA Tomonori | 27f8221 | 2008-07-04 09:30:03 +0200 | [diff] [blame] | 947 | extern void blk_queue_update_dma_pad(struct request_queue *, unsigned int); |
Tejun Heo | 2fb98e8 | 2008-02-19 11:36:53 +0100 | [diff] [blame] | 948 | extern int blk_queue_dma_drain(struct request_queue *q, |
| 949 | dma_drain_needed_fn *dma_drain_needed, |
| 950 | void *buf, unsigned int size); |
Kiyoshi Ueda | ef9e3fa | 2008-10-01 16:12:15 +0200 | [diff] [blame] | 951 | 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] | 952 | extern void blk_queue_segment_boundary(struct request_queue *, unsigned long); |
| 953 | extern void blk_queue_prep_rq(struct request_queue *, prep_rq_fn *pfn); |
| 954 | extern void blk_queue_merge_bvec(struct request_queue *, merge_bvec_fn *); |
| 955 | extern void blk_queue_dma_alignment(struct request_queue *, int); |
James Bottomley | 11c3e68 | 2007-12-31 16:37:00 -0600 | [diff] [blame] | 956 | extern void blk_queue_update_dma_alignment(struct request_queue *, int); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 957 | extern void blk_queue_softirq_done(struct request_queue *, softirq_done_fn *); |
David Woodhouse | fb2dce8 | 2008-08-05 18:01:53 +0100 | [diff] [blame] | 958 | extern void blk_queue_set_discard(struct request_queue *, prepare_discard_fn *); |
Jens Axboe | 242f9dc | 2008-09-14 05:55:09 -0700 | [diff] [blame] | 959 | extern void blk_queue_rq_timed_out(struct request_queue *, rq_timed_out_fn *); |
| 960 | extern void blk_queue_rq_timeout(struct request_queue *, unsigned int); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 961 | 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] | 962 | extern int blk_queue_ordered(struct request_queue *, unsigned, prepare_flush_fn *); |
Tejun Heo | 8f11b3e | 2008-11-28 13:32:05 +0900 | [diff] [blame] | 963 | extern bool blk_do_ordered(struct request_queue *, struct request **); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 964 | extern unsigned blk_ordered_cur_seq(struct request_queue *); |
Tejun Heo | 797e7db | 2006-01-06 09:51:03 +0100 | [diff] [blame] | 965 | extern unsigned blk_ordered_req_seq(struct request *); |
Tejun Heo | 8f11b3e | 2008-11-28 13:32:05 +0900 | [diff] [blame] | 966 | extern bool blk_ordered_complete_seq(struct request_queue *, unsigned, int); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 967 | |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 968 | 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] | 969 | extern void blk_dump_rq_flags(struct request *, char *); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 970 | extern void generic_unplug_device(struct request_queue *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 971 | extern long nr_blockdev_pages(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 972 | |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 973 | int blk_get_queue(struct request_queue *); |
| 974 | struct request_queue *blk_alloc_queue(gfp_t); |
| 975 | struct request_queue *blk_alloc_queue_node(gfp_t, int); |
| 976 | extern void blk_put_queue(struct request_queue *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 977 | |
| 978 | /* |
| 979 | * tag stuff |
| 980 | */ |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 981 | #define blk_rq_tagged(rq) ((rq)->cmd_flags & REQ_QUEUED) |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 982 | extern int blk_queue_start_tag(struct request_queue *, struct request *); |
| 983 | extern struct request *blk_queue_find_tag(struct request_queue *, int); |
| 984 | extern void blk_queue_end_tag(struct request_queue *, struct request *); |
| 985 | extern int blk_queue_init_tags(struct request_queue *, int, struct blk_queue_tag *); |
| 986 | extern void blk_queue_free_tags(struct request_queue *); |
| 987 | extern int blk_queue_resize_tags(struct request_queue *, int); |
| 988 | extern void blk_queue_invalidate_tags(struct request_queue *); |
James Bottomley | 492dfb4 | 2006-08-30 15:48:45 -0400 | [diff] [blame] | 989 | extern struct blk_queue_tag *blk_init_tags(int); |
| 990 | extern void blk_free_tags(struct blk_queue_tag *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 991 | |
David C Somayajulu | f583f49 | 2006-10-04 08:27:25 +0200 | [diff] [blame] | 992 | static inline struct request *blk_map_queue_find_tag(struct blk_queue_tag *bqt, |
| 993 | int tag) |
| 994 | { |
| 995 | if (unlikely(bqt == NULL || tag >= bqt->real_max_depth)) |
| 996 | return NULL; |
| 997 | return bqt->tag_index[tag]; |
| 998 | } |
| 999 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1000 | extern int blkdev_issue_flush(struct block_device *, sector_t *); |
Hugh Dickins | 3e6053d | 2008-09-11 10:57:55 +0200 | [diff] [blame] | 1001 | extern int blkdev_issue_discard(struct block_device *, |
| 1002 | sector_t sector, sector_t nr_sects, gfp_t); |
David Woodhouse | fb2dce8 | 2008-08-05 18:01:53 +0100 | [diff] [blame] | 1003 | |
| 1004 | static inline int sb_issue_discard(struct super_block *sb, |
Hugh Dickins | 3e6053d | 2008-09-11 10:57:55 +0200 | [diff] [blame] | 1005 | sector_t block, sector_t nr_blocks) |
David Woodhouse | fb2dce8 | 2008-08-05 18:01:53 +0100 | [diff] [blame] | 1006 | { |
| 1007 | block <<= (sb->s_blocksize_bits - 9); |
| 1008 | nr_blocks <<= (sb->s_blocksize_bits - 9); |
Hugh Dickins | 3e6053d | 2008-09-11 10:57:55 +0200 | [diff] [blame] | 1009 | return blkdev_issue_discard(sb->s_bdev, block, nr_blocks, GFP_KERNEL); |
David Woodhouse | fb2dce8 | 2008-08-05 18:01:53 +0100 | [diff] [blame] | 1010 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1011 | |
Jens Axboe | 018e044 | 2009-06-26 16:27:10 +0200 | [diff] [blame] | 1012 | 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] | 1013 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1014 | #define MAX_PHYS_SEGMENTS 128 |
| 1015 | #define MAX_HW_SEGMENTS 128 |
Mike Christie | defd94b | 2005-12-05 02:37:06 -0600 | [diff] [blame] | 1016 | #define SAFE_MAX_SECTORS 255 |
| 1017 | #define BLK_DEF_MAX_SECTORS 1024 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1018 | |
| 1019 | #define MAX_SEGMENT_SIZE 65536 |
| 1020 | |
Milan Broz | 0e435ac | 2008-12-03 12:55:08 +0100 | [diff] [blame] | 1021 | #define BLK_SEG_BOUNDARY_MASK 0xFFFFFFFFUL |
| 1022 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1023 | #define blkdev_entry_to_request(entry) list_entry((entry), struct request, queuelist) |
| 1024 | |
Martin K. Petersen | ae03bf6 | 2009-05-22 17:17:50 -0400 | [diff] [blame] | 1025 | static inline unsigned long queue_bounce_pfn(struct request_queue *q) |
| 1026 | { |
Martin K. Petersen | 025146e | 2009-05-22 17:17:51 -0400 | [diff] [blame] | 1027 | return q->limits.bounce_pfn; |
Martin K. Petersen | ae03bf6 | 2009-05-22 17:17:50 -0400 | [diff] [blame] | 1028 | } |
| 1029 | |
| 1030 | static inline unsigned long queue_segment_boundary(struct request_queue *q) |
| 1031 | { |
Martin K. Petersen | 025146e | 2009-05-22 17:17:51 -0400 | [diff] [blame] | 1032 | return q->limits.seg_boundary_mask; |
Martin K. Petersen | ae03bf6 | 2009-05-22 17:17:50 -0400 | [diff] [blame] | 1033 | } |
| 1034 | |
| 1035 | static inline unsigned int queue_max_sectors(struct request_queue *q) |
| 1036 | { |
Martin K. Petersen | 025146e | 2009-05-22 17:17:51 -0400 | [diff] [blame] | 1037 | return q->limits.max_sectors; |
Martin K. Petersen | ae03bf6 | 2009-05-22 17:17:50 -0400 | [diff] [blame] | 1038 | } |
| 1039 | |
| 1040 | static inline unsigned int queue_max_hw_sectors(struct request_queue *q) |
| 1041 | { |
Martin K. Petersen | 025146e | 2009-05-22 17:17:51 -0400 | [diff] [blame] | 1042 | return q->limits.max_hw_sectors; |
Martin K. Petersen | ae03bf6 | 2009-05-22 17:17:50 -0400 | [diff] [blame] | 1043 | } |
| 1044 | |
| 1045 | static inline unsigned short queue_max_hw_segments(struct request_queue *q) |
| 1046 | { |
Martin K. Petersen | 025146e | 2009-05-22 17:17:51 -0400 | [diff] [blame] | 1047 | return q->limits.max_hw_segments; |
Martin K. Petersen | ae03bf6 | 2009-05-22 17:17:50 -0400 | [diff] [blame] | 1048 | } |
| 1049 | |
| 1050 | static inline unsigned short queue_max_phys_segments(struct request_queue *q) |
| 1051 | { |
Martin K. Petersen | 025146e | 2009-05-22 17:17:51 -0400 | [diff] [blame] | 1052 | return q->limits.max_phys_segments; |
Martin K. Petersen | ae03bf6 | 2009-05-22 17:17:50 -0400 | [diff] [blame] | 1053 | } |
| 1054 | |
| 1055 | static inline unsigned int queue_max_segment_size(struct request_queue *q) |
| 1056 | { |
Martin K. Petersen | 025146e | 2009-05-22 17:17:51 -0400 | [diff] [blame] | 1057 | return q->limits.max_segment_size; |
Martin K. Petersen | ae03bf6 | 2009-05-22 17:17:50 -0400 | [diff] [blame] | 1058 | } |
| 1059 | |
Martin K. Petersen | e1defc4 | 2009-05-22 17:17:49 -0400 | [diff] [blame] | 1060 | static inline unsigned short queue_logical_block_size(struct request_queue *q) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1061 | { |
| 1062 | int retval = 512; |
| 1063 | |
Martin K. Petersen | 025146e | 2009-05-22 17:17:51 -0400 | [diff] [blame] | 1064 | if (q && q->limits.logical_block_size) |
| 1065 | retval = q->limits.logical_block_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1066 | |
| 1067 | return retval; |
| 1068 | } |
| 1069 | |
Martin K. Petersen | e1defc4 | 2009-05-22 17:17:49 -0400 | [diff] [blame] | 1070 | static inline unsigned short bdev_logical_block_size(struct block_device *bdev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1071 | { |
Martin K. Petersen | e1defc4 | 2009-05-22 17:17:49 -0400 | [diff] [blame] | 1072 | return queue_logical_block_size(bdev_get_queue(bdev)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1073 | } |
| 1074 | |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 1075 | static inline unsigned int queue_physical_block_size(struct request_queue *q) |
| 1076 | { |
| 1077 | return q->limits.physical_block_size; |
| 1078 | } |
| 1079 | |
| 1080 | static inline unsigned int queue_io_min(struct request_queue *q) |
| 1081 | { |
| 1082 | return q->limits.io_min; |
| 1083 | } |
| 1084 | |
| 1085 | static inline unsigned int queue_io_opt(struct request_queue *q) |
| 1086 | { |
| 1087 | return q->limits.io_opt; |
| 1088 | } |
| 1089 | |
| 1090 | static inline int queue_alignment_offset(struct request_queue *q) |
| 1091 | { |
| 1092 | if (q && q->limits.misaligned) |
| 1093 | return -1; |
| 1094 | |
| 1095 | if (q && q->limits.alignment_offset) |
| 1096 | return q->limits.alignment_offset; |
| 1097 | |
| 1098 | return 0; |
| 1099 | } |
| 1100 | |
| 1101 | static inline int queue_sector_alignment_offset(struct request_queue *q, |
| 1102 | sector_t sector) |
| 1103 | { |
| 1104 | return ((sector << 9) - q->limits.alignment_offset) |
| 1105 | & (q->limits.io_min - 1); |
| 1106 | } |
| 1107 | |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 1108 | static inline int queue_dma_alignment(struct request_queue *q) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1109 | { |
Pete Wyckoff | 482eb68 | 2008-01-01 10:23:02 -0500 | [diff] [blame] | 1110 | return q ? q->dma_alignment : 511; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1111 | } |
| 1112 | |
FUJITA Tomonori | 8790407 | 2008-08-28 15:05:58 +0900 | [diff] [blame] | 1113 | static inline int blk_rq_aligned(struct request_queue *q, void *addr, |
| 1114 | unsigned int len) |
| 1115 | { |
| 1116 | unsigned int alignment = queue_dma_alignment(q) | q->dma_pad_mask; |
| 1117 | return !((unsigned long)addr & alignment) && !(len & alignment); |
| 1118 | } |
| 1119 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1120 | /* assumes size > 256 */ |
| 1121 | static inline unsigned int blksize_bits(unsigned int size) |
| 1122 | { |
| 1123 | unsigned int bits = 8; |
| 1124 | do { |
| 1125 | bits++; |
| 1126 | size >>= 1; |
| 1127 | } while (size > 256); |
| 1128 | return bits; |
| 1129 | } |
| 1130 | |
Adrian Bunk | 2befb9e | 2005-09-10 00:27:17 -0700 | [diff] [blame] | 1131 | static inline unsigned int block_size(struct block_device *bdev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1132 | { |
| 1133 | return bdev->bd_block_size; |
| 1134 | } |
| 1135 | |
| 1136 | typedef struct {struct page *v;} Sector; |
| 1137 | |
| 1138 | unsigned char *read_dev_sector(struct block_device *, sector_t, Sector *); |
| 1139 | |
| 1140 | static inline void put_dev_sector(Sector p) |
| 1141 | { |
| 1142 | page_cache_release(p.v); |
| 1143 | } |
| 1144 | |
| 1145 | struct work_struct; |
Jens Axboe | 18887ad | 2008-07-28 13:08:45 +0200 | [diff] [blame] | 1146 | int kblockd_schedule_work(struct request_queue *q, struct work_struct *work); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1147 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1148 | #define MODULE_ALIAS_BLOCKDEV(major,minor) \ |
| 1149 | MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor)) |
| 1150 | #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \ |
| 1151 | MODULE_ALIAS("block-major-" __stringify(major) "-*") |
| 1152 | |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 1153 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
| 1154 | |
Jens Axboe | b24498d | 2008-06-27 09:12:09 +0200 | [diff] [blame] | 1155 | #define INTEGRITY_FLAG_READ 2 /* verify data integrity on read */ |
| 1156 | #define INTEGRITY_FLAG_WRITE 4 /* generate data integrity on write */ |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 1157 | |
| 1158 | struct blk_integrity_exchg { |
| 1159 | void *prot_buf; |
| 1160 | void *data_buf; |
| 1161 | sector_t sector; |
| 1162 | unsigned int data_size; |
| 1163 | unsigned short sector_size; |
| 1164 | const char *disk_name; |
| 1165 | }; |
| 1166 | |
| 1167 | typedef void (integrity_gen_fn) (struct blk_integrity_exchg *); |
| 1168 | typedef int (integrity_vrfy_fn) (struct blk_integrity_exchg *); |
| 1169 | typedef void (integrity_set_tag_fn) (void *, void *, unsigned int); |
| 1170 | typedef void (integrity_get_tag_fn) (void *, void *, unsigned int); |
| 1171 | |
| 1172 | struct blk_integrity { |
| 1173 | integrity_gen_fn *generate_fn; |
| 1174 | integrity_vrfy_fn *verify_fn; |
| 1175 | integrity_set_tag_fn *set_tag_fn; |
| 1176 | integrity_get_tag_fn *get_tag_fn; |
| 1177 | |
| 1178 | unsigned short flags; |
| 1179 | unsigned short tuple_size; |
| 1180 | unsigned short sector_size; |
| 1181 | unsigned short tag_size; |
| 1182 | |
| 1183 | const char *name; |
| 1184 | |
| 1185 | struct kobject kobj; |
| 1186 | }; |
| 1187 | |
| 1188 | extern int blk_integrity_register(struct gendisk *, struct blk_integrity *); |
| 1189 | extern void blk_integrity_unregister(struct gendisk *); |
Martin K. Petersen | ad7fce9 | 2008-10-01 03:38:39 -0400 | [diff] [blame] | 1190 | extern int blk_integrity_compare(struct gendisk *, struct gendisk *); |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 1191 | extern int blk_rq_map_integrity_sg(struct request *, struct scatterlist *); |
| 1192 | extern int blk_rq_count_integrity_sg(struct request *); |
| 1193 | |
Jens Axboe | b04accc | 2008-10-02 12:53:22 +0200 | [diff] [blame] | 1194 | static inline |
| 1195 | struct blk_integrity *bdev_get_integrity(struct block_device *bdev) |
| 1196 | { |
| 1197 | return bdev->bd_disk->integrity; |
| 1198 | } |
| 1199 | |
Martin K. Petersen | b02739b | 2008-10-02 18:47:49 +0200 | [diff] [blame] | 1200 | static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk) |
| 1201 | { |
| 1202 | return disk->integrity; |
| 1203 | } |
| 1204 | |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 1205 | static inline int blk_integrity_rq(struct request *rq) |
| 1206 | { |
Martin K. Petersen | d442cc4 | 2008-07-16 16:09:06 -0400 | [diff] [blame] | 1207 | if (rq->bio == NULL) |
| 1208 | return 0; |
| 1209 | |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 1210 | return bio_integrity(rq->bio); |
| 1211 | } |
| 1212 | |
| 1213 | #else /* CONFIG_BLK_DEV_INTEGRITY */ |
| 1214 | |
| 1215 | #define blk_integrity_rq(rq) (0) |
| 1216 | #define blk_rq_count_integrity_sg(a) (0) |
| 1217 | #define blk_rq_map_integrity_sg(a, b) (0) |
Jens Axboe | b04accc | 2008-10-02 12:53:22 +0200 | [diff] [blame] | 1218 | #define bdev_get_integrity(a) (0) |
Martin K. Petersen | b02739b | 2008-10-02 18:47:49 +0200 | [diff] [blame] | 1219 | #define blk_get_integrity(a) (0) |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 1220 | #define blk_integrity_compare(a, b) (0) |
| 1221 | #define blk_integrity_register(a, b) (0) |
| 1222 | #define blk_integrity_unregister(a) do { } while (0); |
| 1223 | |
| 1224 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ |
| 1225 | |
Al Viro | 08f8585 | 2007-10-08 13:26:20 -0400 | [diff] [blame] | 1226 | struct block_device_operations { |
Al Viro | d4430d6 | 2008-03-02 09:09:22 -0500 | [diff] [blame] | 1227 | int (*open) (struct block_device *, fmode_t); |
| 1228 | int (*release) (struct gendisk *, fmode_t); |
| 1229 | int (*locked_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); |
| 1230 | int (*ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); |
| 1231 | int (*compat_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); |
Al Viro | 08f8585 | 2007-10-08 13:26:20 -0400 | [diff] [blame] | 1232 | int (*direct_access) (struct block_device *, sector_t, |
| 1233 | void **, unsigned long *); |
| 1234 | int (*media_changed) (struct gendisk *); |
Bartlomiej Zolnierkiewicz | db429e9 | 2009-06-07 13:52:52 +0200 | [diff] [blame] | 1235 | unsigned long long (*set_capacity) (struct gendisk *, |
| 1236 | unsigned long long); |
Al Viro | 08f8585 | 2007-10-08 13:26:20 -0400 | [diff] [blame] | 1237 | int (*revalidate_disk) (struct gendisk *); |
| 1238 | int (*getgeo)(struct block_device *, struct hd_geometry *); |
| 1239 | struct module *owner; |
| 1240 | }; |
| 1241 | |
Al Viro | 633a08b | 2007-08-29 20:34:12 -0400 | [diff] [blame] | 1242 | extern int __blkdev_driver_ioctl(struct block_device *, fmode_t, unsigned int, |
| 1243 | unsigned long); |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 1244 | #else /* CONFIG_BLOCK */ |
| 1245 | /* |
| 1246 | * stubs for when the block layer is configured out |
| 1247 | */ |
| 1248 | #define buffer_heads_over_limit 0 |
| 1249 | |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 1250 | static inline long nr_blockdev_pages(void) |
| 1251 | { |
| 1252 | return 0; |
| 1253 | } |
| 1254 | |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 1255 | #endif /* CONFIG_BLOCK */ |
| 1256 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1257 | #endif |