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 */ |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 63 | /* |
| 64 | * for ATA/ATAPI devices. this really doesn't belong here, ide should |
| 65 | * use REQ_TYPE_SPECIAL and use rq->cmd[0] with the range of driver |
| 66 | * private REQ_LB opcodes to differentiate what type of request this is |
| 67 | */ |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 68 | REQ_TYPE_ATA_TASKFILE, |
Jens Axboe | cea2885 | 2006-10-12 15:08:45 +0200 | [diff] [blame] | 69 | REQ_TYPE_ATA_PC, |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 70 | }; |
| 71 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | #define BLK_MAX_CDB 16 |
| 73 | |
| 74 | /* |
Jens Axboe | 63a7138 | 2008-02-08 12:41:03 +0100 | [diff] [blame] | 75 | * try to put the fields that are referenced together in the same cacheline. |
| 76 | * if you modify this structure, be sure to check block/blk-core.c:rq_init() |
| 77 | * as well! |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | */ |
| 79 | struct request { |
Jens Axboe | ff856ba | 2006-01-09 16:02:34 +0100 | [diff] [blame] | 80 | struct list_head queuelist; |
Jens Axboe | c7c22e4 | 2008-09-13 20:26:01 +0200 | [diff] [blame] | 81 | struct call_single_data csd; |
Jens Axboe | ff856ba | 2006-01-09 16:02:34 +0100 | [diff] [blame] | 82 | |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 83 | struct request_queue *q; |
Jens Axboe | e6a1c87 | 2006-08-10 09:00:21 +0200 | [diff] [blame] | 84 | |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 85 | unsigned int cmd_flags; |
| 86 | enum rq_cmd_type_bits cmd_type; |
Jens Axboe | 242f9dc | 2008-09-14 05:55:09 -0700 | [diff] [blame] | 87 | unsigned long atomic_flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | |
Richard Kennedy | 181fdde | 2010-03-19 08:58:16 +0100 | [diff] [blame] | 89 | int cpu; |
| 90 | |
Tejun Heo | a2dec7b | 2009-05-07 22:24:44 +0900 | [diff] [blame] | 91 | /* the following two fields are internal, NEVER access directly */ |
Tejun Heo | a2dec7b | 2009-05-07 22:24:44 +0900 | [diff] [blame] | 92 | unsigned int __data_len; /* total data len */ |
Richard Kennedy | 181fdde | 2010-03-19 08:58:16 +0100 | [diff] [blame] | 93 | sector_t __sector; /* sector cursor */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | |
| 95 | struct bio *bio; |
| 96 | struct bio *biotail; |
| 97 | |
Jens Axboe | 9817064 | 2006-07-28 09:23:08 +0200 | [diff] [blame] | 98 | struct hlist_node hash; /* merge hash */ |
Jens Axboe | e6a1c87 | 2006-08-10 09:00:21 +0200 | [diff] [blame] | 99 | /* |
| 100 | * The rb_node is only used inside the io scheduler, requests |
| 101 | * are pruned when moved to the dispatch queue. So let the |
| 102 | * completion_data share space with the rb_node. |
| 103 | */ |
| 104 | union { |
| 105 | struct rb_node rb_node; /* sort/lookup */ |
| 106 | void *completion_data; |
| 107 | }; |
Jens Axboe | 9817064 | 2006-07-28 09:23:08 +0200 | [diff] [blame] | 108 | |
Jens Axboe | ff7d145 | 2006-07-12 14:04:37 +0200 | [diff] [blame] | 109 | /* |
Vivek Goyal | 7f1dc8a | 2010-04-21 17:44:16 +0200 | [diff] [blame] | 110 | * Three pointers are available for the IO schedulers, if they need |
Jens Axboe | ff7d145 | 2006-07-12 14:04:37 +0200 | [diff] [blame] | 111 | * more they have to dynamically allocate it. |
| 112 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 113 | void *elevator_private; |
Jens Axboe | ff7d145 | 2006-07-12 14:04:37 +0200 | [diff] [blame] | 114 | void *elevator_private2; |
Vivek Goyal | 7f1dc8a | 2010-04-21 17:44:16 +0200 | [diff] [blame] | 115 | void *elevator_private3; |
Jens Axboe | ff7d145 | 2006-07-12 14:04:37 +0200 | [diff] [blame] | 116 | |
Jens Axboe | 8f34ee7 | 2006-06-13 09:02:34 +0200 | [diff] [blame] | 117 | struct gendisk *rq_disk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | unsigned long start_time; |
Divyesh Shah | 9195291 | 2010-04-01 15:01:41 -0700 | [diff] [blame] | 119 | #ifdef CONFIG_BLK_CGROUP |
| 120 | unsigned long long start_time_ns; |
| 121 | unsigned long long io_start_time_ns; /* when passed to hardware */ |
| 122 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 123 | /* Number of scatter-gather DMA addr+len pairs after |
| 124 | * physical address coalescing is performed. |
| 125 | */ |
| 126 | unsigned short nr_phys_segments; |
Martin K. Petersen | 13f05c8 | 2010-09-10 20:50:10 +0200 | [diff] [blame] | 127 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
| 128 | unsigned short nr_integrity_segments; |
| 129 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | |
Jens Axboe | 8f34ee7 | 2006-06-13 09:02:34 +0200 | [diff] [blame] | 131 | unsigned short ioprio; |
| 132 | |
Richard Kennedy | 181fdde | 2010-03-19 08:58:16 +0100 | [diff] [blame] | 133 | int ref_count; |
| 134 | |
Tejun Heo | 731ec49 | 2009-04-23 11:05:20 +0900 | [diff] [blame] | 135 | void *special; /* opaque pointer available for LLD use */ |
| 136 | char *buffer; /* kaddr of the current segment if available */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 137 | |
Jens Axboe | cdd6026 | 2006-07-28 09:32:07 +0200 | [diff] [blame] | 138 | int tag; |
| 139 | int errors; |
| 140 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 141 | /* |
| 142 | * when request is used as a packet command carrier |
| 143 | */ |
FUJITA Tomonori | d7e3c32 | 2008-04-29 09:54:39 +0200 | [diff] [blame] | 144 | unsigned char __cmd[BLK_MAX_CDB]; |
| 145 | unsigned char *cmd; |
Richard Kennedy | 181fdde | 2010-03-19 08:58:16 +0100 | [diff] [blame] | 146 | unsigned short cmd_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | |
FUJITA Tomonori | 7a85f88 | 2008-03-04 11:17:11 +0100 | [diff] [blame] | 148 | unsigned int extra_len; /* length of alignment and padding */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | unsigned int sense_len; |
Tejun Heo | c3a4d78 | 2009-05-07 22:24:37 +0900 | [diff] [blame] | 150 | unsigned int resid_len; /* residual count */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 151 | void *sense; |
| 152 | |
Jens Axboe | 242f9dc | 2008-09-14 05:55:09 -0700 | [diff] [blame] | 153 | unsigned long deadline; |
| 154 | struct list_head timeout_list; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | unsigned int timeout; |
Mike Christie | 17e01f2 | 2005-11-11 05:31:37 -0600 | [diff] [blame] | 156 | int retries; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 157 | |
| 158 | /* |
Jens Axboe | c00895a | 2006-09-30 20:29:12 +0200 | [diff] [blame] | 159 | * completion callback. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 160 | */ |
| 161 | rq_end_io_fn *end_io; |
| 162 | void *end_io_data; |
FUJITA Tomonori | abae1fd | 2007-07-16 08:52:14 +0200 | [diff] [blame] | 163 | |
| 164 | /* for bidi */ |
| 165 | struct request *next_rq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 166 | }; |
| 167 | |
Fernando Luis Vázquez Cao | 766ca44 | 2008-08-14 09:59:13 +0200 | [diff] [blame] | 168 | static inline unsigned short req_get_ioprio(struct request *req) |
| 169 | { |
| 170 | return req->ioprio; |
| 171 | } |
| 172 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | /* |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 174 | * 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] | 175 | * requests. Some step values could eventually be made generic. |
| 176 | */ |
| 177 | struct request_pm_state |
| 178 | { |
| 179 | /* PM state machine step value, currently driver specific */ |
| 180 | int pm_step; |
| 181 | /* requested PM state value (S1, S2, S3, S4, ...) */ |
| 182 | u32 pm_state; |
| 183 | void* data; /* for driver use */ |
| 184 | }; |
| 185 | |
| 186 | #include <linux/elevator.h> |
| 187 | |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 188 | typedef void (request_fn_proc) (struct request_queue *q); |
| 189 | typedef int (make_request_fn) (struct request_queue *q, struct bio *bio); |
| 190 | typedef int (prep_rq_fn) (struct request_queue *, struct request *); |
James Bottomley | 28018c2 | 2010-07-01 19:49:17 +0900 | [diff] [blame] | 191 | typedef void (unprep_rq_fn) (struct request_queue *, struct request *); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 192 | typedef void (unplug_fn) (struct request_queue *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 193 | |
| 194 | struct bio_vec; |
Alasdair G Kergon | cc371e6 | 2008-07-03 09:53:43 +0200 | [diff] [blame] | 195 | struct bvec_merge_data { |
| 196 | struct block_device *bi_bdev; |
| 197 | sector_t bi_sector; |
| 198 | unsigned bi_size; |
| 199 | unsigned long bi_rw; |
| 200 | }; |
| 201 | typedef int (merge_bvec_fn) (struct request_queue *, struct bvec_merge_data *, |
| 202 | struct bio_vec *); |
Jens Axboe | ff856ba | 2006-01-09 16:02:34 +0100 | [diff] [blame] | 203 | typedef void (softirq_done_fn)(struct request *); |
Tejun Heo | 2fb98e8 | 2008-02-19 11:36:53 +0100 | [diff] [blame] | 204 | typedef int (dma_drain_needed_fn)(struct request *); |
Kiyoshi Ueda | ef9e3fa | 2008-10-01 16:12:15 +0200 | [diff] [blame] | 205 | typedef int (lld_busy_fn) (struct request_queue *q); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 206 | |
Jens Axboe | 242f9dc | 2008-09-14 05:55:09 -0700 | [diff] [blame] | 207 | enum blk_eh_timer_return { |
| 208 | BLK_EH_NOT_HANDLED, |
| 209 | BLK_EH_HANDLED, |
| 210 | BLK_EH_RESET_TIMER, |
| 211 | }; |
| 212 | |
| 213 | typedef enum blk_eh_timer_return (rq_timed_out_fn)(struct request *); |
| 214 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 215 | enum blk_queue_state { |
| 216 | Queue_down, |
| 217 | Queue_up, |
| 218 | }; |
| 219 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 220 | struct blk_queue_tag { |
| 221 | struct request **tag_index; /* map of busy tags */ |
| 222 | unsigned long *tag_map; /* bit map of free/busy tags */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 223 | int busy; /* current depth */ |
| 224 | int max_depth; /* what we will send to device */ |
Tejun Heo | ba02508 | 2005-08-05 13:28:11 -0700 | [diff] [blame] | 225 | int real_max_depth; /* what the array can hold */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 226 | atomic_t refcnt; /* map can be shared */ |
| 227 | }; |
| 228 | |
FUJITA Tomonori | abf5439 | 2008-08-16 14:10:05 +0900 | [diff] [blame] | 229 | #define BLK_SCSI_MAX_CMDS (256) |
| 230 | #define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8)) |
| 231 | |
Martin K. Petersen | 025146e | 2009-05-22 17:17:51 -0400 | [diff] [blame] | 232 | struct queue_limits { |
| 233 | unsigned long bounce_pfn; |
| 234 | unsigned long seg_boundary_mask; |
| 235 | |
| 236 | unsigned int max_hw_sectors; |
| 237 | unsigned int max_sectors; |
| 238 | unsigned int max_segment_size; |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 239 | unsigned int physical_block_size; |
| 240 | unsigned int alignment_offset; |
| 241 | unsigned int io_min; |
| 242 | unsigned int io_opt; |
Christoph Hellwig | 67efc92 | 2009-09-30 13:54:20 +0200 | [diff] [blame] | 243 | unsigned int max_discard_sectors; |
Martin K. Petersen | 86b3728 | 2009-11-10 11:50:21 +0100 | [diff] [blame] | 244 | unsigned int discard_granularity; |
| 245 | unsigned int discard_alignment; |
Martin K. Petersen | 025146e | 2009-05-22 17:17:51 -0400 | [diff] [blame] | 246 | |
| 247 | unsigned short logical_block_size; |
Martin K. Petersen | 8a78362 | 2010-02-26 00:20:39 -0500 | [diff] [blame] | 248 | unsigned short max_segments; |
Martin K. Petersen | 13f05c8 | 2010-09-10 20:50:10 +0200 | [diff] [blame] | 249 | unsigned short max_integrity_segments; |
Martin K. Petersen | 025146e | 2009-05-22 17:17:51 -0400 | [diff] [blame] | 250 | |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 251 | unsigned char misaligned; |
Martin K. Petersen | 86b3728 | 2009-11-10 11:50:21 +0100 | [diff] [blame] | 252 | unsigned char discard_misaligned; |
Martin K. Petersen | 025146e | 2009-05-22 17:17:51 -0400 | [diff] [blame] | 253 | unsigned char no_cluster; |
Martin K. Petersen | 98262f2 | 2009-12-03 09:24:48 +0100 | [diff] [blame] | 254 | signed char discard_zeroes_data; |
Martin K. Petersen | 025146e | 2009-05-22 17:17:51 -0400 | [diff] [blame] | 255 | }; |
| 256 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 257 | struct request_queue |
| 258 | { |
| 259 | /* |
| 260 | * Together with queue_head for cacheline sharing |
| 261 | */ |
| 262 | struct list_head queue_head; |
| 263 | struct request *last_merge; |
Jens Axboe | b374d18 | 2008-10-31 10:05:07 +0100 | [diff] [blame] | 264 | struct elevator_queue *elevator; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 265 | |
| 266 | /* |
| 267 | * the queue request freelist, one for reads and one for writes |
| 268 | */ |
| 269 | struct request_list rq; |
| 270 | |
| 271 | request_fn_proc *request_fn; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 272 | make_request_fn *make_request_fn; |
| 273 | prep_rq_fn *prep_rq_fn; |
James Bottomley | 28018c2 | 2010-07-01 19:49:17 +0900 | [diff] [blame] | 274 | unprep_rq_fn *unprep_rq_fn; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 275 | unplug_fn *unplug_fn; |
| 276 | merge_bvec_fn *merge_bvec_fn; |
Jens Axboe | ff856ba | 2006-01-09 16:02:34 +0100 | [diff] [blame] | 277 | softirq_done_fn *softirq_done_fn; |
Jens Axboe | 242f9dc | 2008-09-14 05:55:09 -0700 | [diff] [blame] | 278 | rq_timed_out_fn *rq_timed_out_fn; |
Tejun Heo | 2fb98e8 | 2008-02-19 11:36:53 +0100 | [diff] [blame] | 279 | dma_drain_needed_fn *dma_drain_needed; |
Kiyoshi Ueda | ef9e3fa | 2008-10-01 16:12:15 +0200 | [diff] [blame] | 280 | lld_busy_fn *lld_busy_fn; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | |
| 282 | /* |
Tejun Heo | 8922e16 | 2005-10-20 16:23:44 +0200 | [diff] [blame] | 283 | * Dispatch queue sorting |
| 284 | */ |
Jens Axboe | 1b47f53 | 2005-10-20 16:37:00 +0200 | [diff] [blame] | 285 | sector_t end_sector; |
Tejun Heo | 8922e16 | 2005-10-20 16:23:44 +0200 | [diff] [blame] | 286 | struct request *boundary_rq; |
Tejun Heo | 8922e16 | 2005-10-20 16:23:44 +0200 | [diff] [blame] | 287 | |
| 288 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 289 | * Auto-unplugging state |
| 290 | */ |
| 291 | struct timer_list unplug_timer; |
| 292 | int unplug_thresh; /* After this many requests */ |
| 293 | unsigned long unplug_delay; /* After this many jiffies */ |
| 294 | struct work_struct unplug_work; |
| 295 | |
| 296 | struct backing_dev_info backing_dev_info; |
| 297 | |
| 298 | /* |
| 299 | * The queue owner gets to use this for whatever they like. |
| 300 | * ll_rw_blk doesn't touch it. |
| 301 | */ |
| 302 | void *queuedata; |
| 303 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 304 | /* |
| 305 | * queue needs bounce pages for pages above this limit |
| 306 | */ |
Al Viro | 8267e26 | 2005-10-21 03:20:53 -0400 | [diff] [blame] | 307 | gfp_t bounce_gfp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 308 | |
| 309 | /* |
| 310 | * various queue flags, see QUEUE_* below |
| 311 | */ |
| 312 | unsigned long queue_flags; |
| 313 | |
| 314 | /* |
| 152587d | 2005-04-12 16:22:06 -0500 | [diff] [blame] | 315 | * protects queue structures from reentrancy. ->__queue_lock should |
| 316 | * _never_ be used directly, it is queue private. always use |
| 317 | * ->queue_lock. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 318 | */ |
| 152587d | 2005-04-12 16:22:06 -0500 | [diff] [blame] | 319 | spinlock_t __queue_lock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 320 | spinlock_t *queue_lock; |
| 321 | |
| 322 | /* |
| 323 | * queue kobject |
| 324 | */ |
| 325 | struct kobject kobj; |
| 326 | |
| 327 | /* |
| 328 | * queue settings |
| 329 | */ |
| 330 | unsigned long nr_requests; /* Max # of requests */ |
| 331 | unsigned int nr_congestion_on; |
| 332 | unsigned int nr_congestion_off; |
| 333 | unsigned int nr_batching; |
| 334 | |
James Bottomley | fa0ccd8 | 2008-01-10 11:30:36 -0600 | [diff] [blame] | 335 | void *dma_drain_buffer; |
| 336 | unsigned int dma_drain_size; |
Tejun Heo | e3790c7 | 2008-03-04 11:18:17 +0100 | [diff] [blame] | 337 | unsigned int dma_pad_mask; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 338 | unsigned int dma_alignment; |
| 339 | |
| 340 | struct blk_queue_tag *queue_tags; |
Jens Axboe | 6eca900 | 2007-10-25 10:14:47 +0200 | [diff] [blame] | 341 | struct list_head tag_busy_list; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 342 | |
Tejun Heo | 15853af | 2005-11-10 08:52:05 +0100 | [diff] [blame] | 343 | unsigned int nr_sorted; |
Jens Axboe | 0a7ae2f | 2009-05-20 08:54:31 +0200 | [diff] [blame] | 344 | unsigned int in_flight[2]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 345 | |
Jens Axboe | 242f9dc | 2008-09-14 05:55:09 -0700 | [diff] [blame] | 346 | unsigned int rq_timeout; |
| 347 | struct timer_list timeout; |
| 348 | struct list_head timeout_list; |
| 349 | |
Martin K. Petersen | 025146e | 2009-05-22 17:17:51 -0400 | [diff] [blame] | 350 | struct queue_limits limits; |
| 351 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 352 | /* |
| 353 | * sg stuff |
| 354 | */ |
| 355 | unsigned int sg_timeout; |
| 356 | unsigned int sg_reserved_size; |
Christoph Lameter | 1946089 | 2005-06-23 00:08:19 -0700 | [diff] [blame] | 357 | int node; |
Alexey Dobriyan | 6c5c934 | 2006-09-29 01:59:40 -0700 | [diff] [blame] | 358 | #ifdef CONFIG_BLK_DEV_IO_TRACE |
Jens Axboe | 2056a78 | 2006-03-23 20:00:26 +0100 | [diff] [blame] | 359 | struct blk_trace *blk_trace; |
Alexey Dobriyan | 6c5c934 | 2006-09-29 01:59:40 -0700 | [diff] [blame] | 360 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 361 | /* |
Tejun Heo | 4913efe | 2010-09-03 11:56:16 +0200 | [diff] [blame] | 362 | * for flush operations |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 363 | */ |
Tejun Heo | 4913efe | 2010-09-03 11:56:16 +0200 | [diff] [blame] | 364 | unsigned int flush_flags; |
Tejun Heo | dd4c133 | 2010-09-03 11:56:16 +0200 | [diff] [blame] | 365 | unsigned int flush_seq; |
| 366 | int flush_err; |
| 367 | struct request flush_rq; |
| 368 | struct request *orig_flush_rq; |
| 369 | struct list_head pending_flushes; |
Al Viro | 483f4af | 2006-03-18 18:34:37 -0500 | [diff] [blame] | 370 | |
| 371 | struct mutex sysfs_lock; |
FUJITA Tomonori | d351af0 | 2007-07-09 12:40:35 +0200 | [diff] [blame] | 372 | |
| 373 | #if defined(CONFIG_BLK_DEV_BSG) |
| 374 | struct bsg_class_device bsg_dev; |
| 375 | #endif |
Vivek Goyal | e43473b | 2010-09-15 17:06:35 -0400 | [diff] [blame] | 376 | |
| 377 | #ifdef CONFIG_BLK_DEV_THROTTLING |
| 378 | /* Throttle data */ |
| 379 | struct throtl_data *td; |
| 380 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 381 | }; |
| 382 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 383 | #define QUEUE_FLAG_CLUSTER 0 /* cluster several segments into 1 */ |
| 384 | #define QUEUE_FLAG_QUEUED 1 /* uses generic tag queueing */ |
| 385 | #define QUEUE_FLAG_STOPPED 2 /* queue is stopped */ |
Jens Axboe | 1faa16d | 2009-04-06 14:48:01 +0200 | [diff] [blame] | 386 | #define QUEUE_FLAG_SYNCFULL 3 /* read queue has been filled */ |
| 387 | #define QUEUE_FLAG_ASYNCFULL 4 /* write queue has been filled */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 388 | #define QUEUE_FLAG_DEAD 5 /* queue being torn down */ |
| 389 | #define QUEUE_FLAG_REENTER 6 /* Re-entrancy avoidance */ |
| 390 | #define QUEUE_FLAG_PLUGGED 7 /* queue is plugged */ |
Jens Axboe | 64521d1 | 2005-10-28 08:30:39 +0200 | [diff] [blame] | 391 | #define QUEUE_FLAG_ELVSWITCH 8 /* don't use elevator, just do FIFO */ |
FUJITA Tomonori | abae1fd | 2007-07-16 08:52:14 +0200 | [diff] [blame] | 392 | #define QUEUE_FLAG_BIDI 9 /* queue supports bidi requests */ |
Alan D. Brunelle | ac9fafa | 2008-04-29 14:44:19 +0200 | [diff] [blame] | 393 | #define QUEUE_FLAG_NOMERGES 10 /* disable merge attempts */ |
Jens Axboe | c7c22e4 | 2008-09-13 20:26:01 +0200 | [diff] [blame] | 394 | #define QUEUE_FLAG_SAME_COMP 11 /* force complete on same CPU */ |
Jens Axboe | 581d4e2 | 2008-09-14 05:56:33 -0700 | [diff] [blame] | 395 | #define QUEUE_FLAG_FAIL_IO 12 /* fake timeout */ |
Kiyoshi Ueda | 4ee5eaf | 2008-09-18 10:46:13 -0400 | [diff] [blame] | 396 | #define QUEUE_FLAG_STACKABLE 13 /* supports request stacking */ |
Jens Axboe | a68bbdd | 2008-09-24 13:03:33 +0200 | [diff] [blame] | 397 | #define QUEUE_FLAG_NONROT 14 /* non-rotational device (SSD) */ |
Fernando Luis Vázquez Cao | 88e740f | 2008-10-27 18:44:46 +0900 | [diff] [blame] | 398 | #define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */ |
Jens Axboe | bc58ba9 | 2009-01-23 10:54:44 +0100 | [diff] [blame] | 399 | #define QUEUE_FLAG_IO_STAT 15 /* do IO stats */ |
Jens Axboe | 79da0644 | 2010-02-23 08:40:43 +0100 | [diff] [blame] | 400 | #define QUEUE_FLAG_DISCARD 16 /* supports DISCARD */ |
Jens Axboe | 7f03292 | 2010-02-25 08:48:05 +0100 | [diff] [blame] | 401 | #define QUEUE_FLAG_NOXMERGES 17 /* No extended merges */ |
Jens Axboe | e2e1a14 | 2010-06-09 10:42:09 +0200 | [diff] [blame] | 402 | #define QUEUE_FLAG_ADD_RANDOM 18 /* Contributes to random pool */ |
Adrian Hunter | 8d57a98 | 2010-08-11 14:17:49 -0700 | [diff] [blame] | 403 | #define QUEUE_FLAG_SECDISCARD 19 /* supports SECDISCARD */ |
Jens Axboe | bc58ba9 | 2009-01-23 10:54:44 +0100 | [diff] [blame] | 404 | |
| 405 | #define QUEUE_FLAG_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \ |
| 406 | (1 << QUEUE_FLAG_CLUSTER) | \ |
Jens Axboe | 01e97f6 | 2009-09-03 20:06:47 +0200 | [diff] [blame] | 407 | (1 << QUEUE_FLAG_STACKABLE) | \ |
Jens Axboe | e2e1a14 | 2010-06-09 10:42:09 +0200 | [diff] [blame] | 408 | (1 << QUEUE_FLAG_SAME_COMP) | \ |
| 409 | (1 << QUEUE_FLAG_ADD_RANDOM)) |
Tejun Heo | 797e7db | 2006-01-06 09:51:03 +0100 | [diff] [blame] | 410 | |
Linus Torvalds | 8f45c1a | 2008-04-29 10:16:38 -0700 | [diff] [blame] | 411 | static inline int queue_is_locked(struct request_queue *q) |
| 412 | { |
Jens Axboe | 7663c1e | 2008-04-29 21:31:27 +0200 | [diff] [blame] | 413 | #ifdef CONFIG_SMP |
Linus Torvalds | 8f45c1a | 2008-04-29 10:16:38 -0700 | [diff] [blame] | 414 | spinlock_t *lock = q->queue_lock; |
| 415 | return lock && spin_is_locked(lock); |
Jens Axboe | 7663c1e | 2008-04-29 21:31:27 +0200 | [diff] [blame] | 416 | #else |
| 417 | return 1; |
| 418 | #endif |
Linus Torvalds | 8f45c1a | 2008-04-29 10:16:38 -0700 | [diff] [blame] | 419 | } |
| 420 | |
Nick Piggin | 75ad23b | 2008-04-29 14:48:33 +0200 | [diff] [blame] | 421 | static inline void queue_flag_set_unlocked(unsigned int flag, |
| 422 | struct request_queue *q) |
| 423 | { |
| 424 | __set_bit(flag, &q->queue_flags); |
| 425 | } |
| 426 | |
Jens Axboe | e48ec69 | 2008-07-03 13:18:54 +0200 | [diff] [blame] | 427 | static inline int queue_flag_test_and_clear(unsigned int flag, |
| 428 | struct request_queue *q) |
| 429 | { |
| 430 | WARN_ON_ONCE(!queue_is_locked(q)); |
| 431 | |
| 432 | if (test_bit(flag, &q->queue_flags)) { |
| 433 | __clear_bit(flag, &q->queue_flags); |
| 434 | return 1; |
| 435 | } |
| 436 | |
| 437 | return 0; |
| 438 | } |
| 439 | |
| 440 | static inline int queue_flag_test_and_set(unsigned int flag, |
| 441 | struct request_queue *q) |
| 442 | { |
| 443 | WARN_ON_ONCE(!queue_is_locked(q)); |
| 444 | |
| 445 | if (!test_bit(flag, &q->queue_flags)) { |
| 446 | __set_bit(flag, &q->queue_flags); |
| 447 | return 0; |
| 448 | } |
| 449 | |
| 450 | return 1; |
| 451 | } |
| 452 | |
Nick Piggin | 75ad23b | 2008-04-29 14:48:33 +0200 | [diff] [blame] | 453 | static inline void queue_flag_set(unsigned int flag, struct request_queue *q) |
| 454 | { |
Linus Torvalds | 8f45c1a | 2008-04-29 10:16:38 -0700 | [diff] [blame] | 455 | WARN_ON_ONCE(!queue_is_locked(q)); |
Nick Piggin | 75ad23b | 2008-04-29 14:48:33 +0200 | [diff] [blame] | 456 | __set_bit(flag, &q->queue_flags); |
| 457 | } |
| 458 | |
| 459 | static inline void queue_flag_clear_unlocked(unsigned int flag, |
| 460 | struct request_queue *q) |
| 461 | { |
| 462 | __clear_bit(flag, &q->queue_flags); |
| 463 | } |
| 464 | |
Jens Axboe | 0a7ae2f | 2009-05-20 08:54:31 +0200 | [diff] [blame] | 465 | static inline int queue_in_flight(struct request_queue *q) |
| 466 | { |
| 467 | return q->in_flight[0] + q->in_flight[1]; |
| 468 | } |
| 469 | |
Nick Piggin | 75ad23b | 2008-04-29 14:48:33 +0200 | [diff] [blame] | 470 | static inline void queue_flag_clear(unsigned int flag, struct request_queue *q) |
| 471 | { |
Linus Torvalds | 8f45c1a | 2008-04-29 10:16:38 -0700 | [diff] [blame] | 472 | WARN_ON_ONCE(!queue_is_locked(q)); |
Nick Piggin | 75ad23b | 2008-04-29 14:48:33 +0200 | [diff] [blame] | 473 | __clear_bit(flag, &q->queue_flags); |
| 474 | } |
| 475 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 476 | #define blk_queue_plugged(q) test_bit(QUEUE_FLAG_PLUGGED, &(q)->queue_flags) |
| 477 | #define blk_queue_tagged(q) test_bit(QUEUE_FLAG_QUEUED, &(q)->queue_flags) |
| 478 | #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] | 479 | #define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags) |
Alan D. Brunelle | 488991e | 2010-01-29 09:04:08 +0100 | [diff] [blame] | 480 | #define blk_queue_noxmerges(q) \ |
| 481 | test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags) |
Jens Axboe | a68bbdd | 2008-09-24 13:03:33 +0200 | [diff] [blame] | 482 | #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] | 483 | #define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags) |
Jens Axboe | e2e1a14 | 2010-06-09 10:42:09 +0200 | [diff] [blame] | 484 | #define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags) |
Kiyoshi Ueda | 4ee5eaf | 2008-09-18 10:46:13 -0400 | [diff] [blame] | 485 | #define blk_queue_stackable(q) \ |
| 486 | test_bit(QUEUE_FLAG_STACKABLE, &(q)->queue_flags) |
Christoph Hellwig | c15227d | 2009-09-30 13:52:12 +0200 | [diff] [blame] | 487 | #define blk_queue_discard(q) test_bit(QUEUE_FLAG_DISCARD, &(q)->queue_flags) |
Adrian Hunter | 8d57a98 | 2010-08-11 14:17:49 -0700 | [diff] [blame] | 488 | #define blk_queue_secdiscard(q) (blk_queue_discard(q) && \ |
| 489 | test_bit(QUEUE_FLAG_SECDISCARD, &(q)->queue_flags)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 490 | |
Christoph Hellwig | 33659eb | 2010-08-07 18:17:56 +0200 | [diff] [blame] | 491 | #define blk_noretry_request(rq) \ |
| 492 | ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \ |
| 493 | REQ_FAILFAST_DRIVER)) |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 494 | |
Christoph Hellwig | 33659eb | 2010-08-07 18:17:56 +0200 | [diff] [blame] | 495 | #define blk_account_rq(rq) \ |
| 496 | (((rq)->cmd_flags & REQ_STARTED) && \ |
| 497 | ((rq)->cmd_type == REQ_TYPE_FS || \ |
| 498 | ((rq)->cmd_flags & REQ_DISCARD))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 499 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 500 | #define blk_pm_request(rq) \ |
Christoph Hellwig | 33659eb | 2010-08-07 18:17:56 +0200 | [diff] [blame] | 501 | ((rq)->cmd_type == REQ_TYPE_PM_SUSPEND || \ |
| 502 | (rq)->cmd_type == REQ_TYPE_PM_RESUME) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 503 | |
Jens Axboe | ab780f1 | 2008-08-26 10:25:02 +0200 | [diff] [blame] | 504 | #define blk_rq_cpu_valid(rq) ((rq)->cpu != -1) |
FUJITA Tomonori | abae1fd | 2007-07-16 08:52:14 +0200 | [diff] [blame] | 505 | #define blk_bidi_rq(rq) ((rq)->next_rq != NULL) |
Kiyoshi Ueda | 336cdb4 | 2007-12-11 17:40:30 -0500 | [diff] [blame] | 506 | /* rq->queuelist of dequeued request must be list_empty() */ |
| 507 | #define blk_queued_rq(rq) (!list_empty(&(rq)->queuelist)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 508 | |
| 509 | #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist) |
| 510 | |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 511 | #define rq_data_dir(rq) ((rq)->cmd_flags & 1) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 512 | |
Jens Axboe | 9e2585a | 2006-07-28 09:26:13 +0200 | [diff] [blame] | 513 | /* |
Jens Axboe | 1faa16d | 2009-04-06 14:48:01 +0200 | [diff] [blame] | 514 | * 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] | 515 | */ |
Jens Axboe | 1faa16d | 2009-04-06 14:48:01 +0200 | [diff] [blame] | 516 | static inline bool rw_is_sync(unsigned int rw_flags) |
| 517 | { |
Christoph Hellwig | 7b6d91d | 2010-08-07 18:20:39 +0200 | [diff] [blame] | 518 | return !(rw_flags & REQ_WRITE) || (rw_flags & REQ_SYNC); |
Jens Axboe | 1faa16d | 2009-04-06 14:48:01 +0200 | [diff] [blame] | 519 | } |
| 520 | |
| 521 | static inline bool rq_is_sync(struct request *rq) |
| 522 | { |
| 523 | return rw_is_sync(rq->cmd_flags); |
| 524 | } |
| 525 | |
Jens Axboe | 1faa16d | 2009-04-06 14:48:01 +0200 | [diff] [blame] | 526 | static inline int blk_queue_full(struct request_queue *q, int sync) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 527 | { |
Jens Axboe | 1faa16d | 2009-04-06 14:48:01 +0200 | [diff] [blame] | 528 | if (sync) |
| 529 | return test_bit(QUEUE_FLAG_SYNCFULL, &q->queue_flags); |
| 530 | return test_bit(QUEUE_FLAG_ASYNCFULL, &q->queue_flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 531 | } |
| 532 | |
Jens Axboe | 1faa16d | 2009-04-06 14:48:01 +0200 | [diff] [blame] | 533 | 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] | 534 | { |
Jens Axboe | 1faa16d | 2009-04-06 14:48:01 +0200 | [diff] [blame] | 535 | if (sync) |
| 536 | queue_flag_set(QUEUE_FLAG_SYNCFULL, q); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 537 | else |
Jens Axboe | 1faa16d | 2009-04-06 14:48:01 +0200 | [diff] [blame] | 538 | queue_flag_set(QUEUE_FLAG_ASYNCFULL, q); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 539 | } |
| 540 | |
Jens Axboe | 1faa16d | 2009-04-06 14:48:01 +0200 | [diff] [blame] | 541 | 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] | 542 | { |
Jens Axboe | 1faa16d | 2009-04-06 14:48:01 +0200 | [diff] [blame] | 543 | if (sync) |
| 544 | queue_flag_clear(QUEUE_FLAG_SYNCFULL, q); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 545 | else |
Jens Axboe | 1faa16d | 2009-04-06 14:48:01 +0200 | [diff] [blame] | 546 | queue_flag_clear(QUEUE_FLAG_ASYNCFULL, q); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 547 | } |
| 548 | |
| 549 | |
| 550 | /* |
| 551 | * mergeable request must not have _NOMERGE or _BARRIER bit set, nor may |
| 552 | * it already be started by driver. |
| 553 | */ |
| 554 | #define RQ_NOMERGE_FLAGS \ |
Tejun Heo | 4fed947 | 2010-09-03 11:56:17 +0200 | [diff] [blame] | 555 | (REQ_NOMERGE | REQ_STARTED | REQ_HARDBARRIER | REQ_SOFTBARRIER | \ |
| 556 | REQ_FLUSH | REQ_FUA) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 557 | #define rq_mergeable(rq) \ |
David Woodhouse | e17fc0a | 2008-08-09 16:42:20 +0100 | [diff] [blame] | 558 | (!((rq)->cmd_flags & RQ_NOMERGE_FLAGS) && \ |
Christoph Hellwig | 33659eb | 2010-08-07 18:17:56 +0200 | [diff] [blame] | 559 | (((rq)->cmd_flags & REQ_DISCARD) || \ |
| 560 | (rq)->cmd_type == REQ_TYPE_FS)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 561 | |
| 562 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 563 | * q->prep_rq_fn return values |
| 564 | */ |
| 565 | #define BLKPREP_OK 0 /* serve it */ |
| 566 | #define BLKPREP_KILL 1 /* fatal error, kill */ |
| 567 | #define BLKPREP_DEFER 2 /* leave on queue */ |
| 568 | |
| 569 | extern unsigned long blk_max_low_pfn, blk_max_pfn; |
| 570 | |
| 571 | /* |
| 572 | * standard bounce addresses: |
| 573 | * |
| 574 | * BLK_BOUNCE_HIGH : bounce all highmem pages |
| 575 | * BLK_BOUNCE_ANY : don't bounce anything |
| 576 | * BLK_BOUNCE_ISA : bounce pages above ISA DMA boundary |
| 577 | */ |
Andi Kleen | 2472892 | 2008-04-21 09:51:05 +0200 | [diff] [blame] | 578 | |
| 579 | #if BITS_PER_LONG == 32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 580 | #define BLK_BOUNCE_HIGH ((u64)blk_max_low_pfn << PAGE_SHIFT) |
Andi Kleen | 2472892 | 2008-04-21 09:51:05 +0200 | [diff] [blame] | 581 | #else |
| 582 | #define BLK_BOUNCE_HIGH -1ULL |
| 583 | #endif |
| 584 | #define BLK_BOUNCE_ANY (-1ULL) |
FUJITA Tomonori | bfe1723 | 2010-05-31 15:59:03 +0900 | [diff] [blame] | 585 | #define BLK_BOUNCE_ISA (DMA_BIT_MASK(24)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 586 | |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 587 | /* |
| 588 | * default timeout for SG_IO if none specified |
| 589 | */ |
| 590 | #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ) |
Linus Torvalds | f2f1fa7 | 2008-12-05 14:49:18 -0800 | [diff] [blame] | 591 | #define BLK_MIN_SG_TIMEOUT (7 * HZ) |
Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 592 | |
Christoph Lameter | 2a7326b | 2007-07-17 04:03:37 -0700 | [diff] [blame] | 593 | #ifdef CONFIG_BOUNCE |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 594 | extern int init_emergency_isa_pool(void); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 595 | extern void blk_queue_bounce(struct request_queue *q, struct bio **bio); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 596 | #else |
| 597 | static inline int init_emergency_isa_pool(void) |
| 598 | { |
| 599 | return 0; |
| 600 | } |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 601 | 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] | 602 | { |
| 603 | } |
| 604 | #endif /* CONFIG_MMU */ |
| 605 | |
FUJITA Tomonori | 152e283 | 2008-08-28 16:17:06 +0900 | [diff] [blame] | 606 | struct rq_map_data { |
| 607 | struct page **pages; |
| 608 | int page_order; |
| 609 | int nr_entries; |
FUJITA Tomonori | 56c451f | 2008-12-18 14:49:37 +0900 | [diff] [blame] | 610 | unsigned long offset; |
FUJITA Tomonori | 97ae77a | 2008-12-18 14:49:38 +0900 | [diff] [blame] | 611 | int null_mapped; |
FUJITA Tomonori | ecb554a | 2009-07-09 14:46:53 +0200 | [diff] [blame] | 612 | int from_user; |
FUJITA Tomonori | 152e283 | 2008-08-28 16:17:06 +0900 | [diff] [blame] | 613 | }; |
| 614 | |
NeilBrown | 5705f70 | 2007-09-25 12:35:59 +0200 | [diff] [blame] | 615 | struct req_iterator { |
| 616 | int i; |
| 617 | struct bio *bio; |
| 618 | }; |
| 619 | |
| 620 | /* This should not be used directly - use rq_for_each_segment */ |
Jens Axboe | 1e42807 | 2009-02-23 09:03:10 +0100 | [diff] [blame] | 621 | #define for_each_bio(_bio) \ |
| 622 | for (; _bio; _bio = _bio->bi_next) |
NeilBrown | 5705f70 | 2007-09-25 12:35:59 +0200 | [diff] [blame] | 623 | #define __rq_for_each_bio(_bio, rq) \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 624 | if ((rq->bio)) \ |
| 625 | for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next) |
| 626 | |
NeilBrown | 5705f70 | 2007-09-25 12:35:59 +0200 | [diff] [blame] | 627 | #define rq_for_each_segment(bvl, _rq, _iter) \ |
| 628 | __rq_for_each_bio(_iter.bio, _rq) \ |
| 629 | bio_for_each_segment(bvl, _iter.bio, _iter.i) |
| 630 | |
| 631 | #define rq_iter_last(rq, _iter) \ |
| 632 | (_iter.bio->bi_next == NULL && _iter.i == _iter.bio->bi_vcnt-1) |
| 633 | |
Ilya Loginov | 2d4dc89 | 2009-11-26 09:16:19 +0100 | [diff] [blame] | 634 | #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE |
| 635 | # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform" |
| 636 | #endif |
| 637 | #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE |
| 638 | extern void rq_flush_dcache_pages(struct request *rq); |
| 639 | #else |
| 640 | static inline void rq_flush_dcache_pages(struct request *rq) |
| 641 | { |
| 642 | } |
| 643 | #endif |
| 644 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 645 | extern int blk_register_queue(struct gendisk *disk); |
| 646 | extern void blk_unregister_queue(struct gendisk *disk); |
| 647 | extern void register_disk(struct gendisk *dev); |
| 648 | extern void generic_make_request(struct bio *bio); |
FUJITA Tomonori | 2a4aa30 | 2008-04-29 09:54:36 +0200 | [diff] [blame] | 649 | extern void blk_rq_init(struct request_queue *q, struct request *rq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 650 | extern void blk_put_request(struct request *); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 651 | extern void __blk_put_request(struct request_queue *, struct request *); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 652 | extern struct request *blk_get_request(struct request_queue *, int, gfp_t); |
Boaz Harrosh | 79eb63e | 2009-05-17 18:57:15 +0300 | [diff] [blame] | 653 | extern struct request *blk_make_request(struct request_queue *, struct bio *, |
| 654 | gfp_t); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 655 | extern void blk_insert_request(struct request_queue *, struct request *, int, void *); |
| 656 | extern void blk_requeue_request(struct request_queue *, struct request *); |
Christoph Hellwig | 66ac028 | 2010-06-18 16:59:42 +0200 | [diff] [blame] | 657 | extern void blk_add_request_payload(struct request *rq, struct page *page, |
| 658 | unsigned int len); |
Kiyoshi Ueda | 82124d6 | 2008-09-18 10:45:38 -0400 | [diff] [blame] | 659 | 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] | 660 | extern int blk_lld_busy(struct request_queue *q); |
Kiyoshi Ueda | b0fd271 | 2009-06-11 13:10:16 +0200 | [diff] [blame] | 661 | extern int blk_rq_prep_clone(struct request *rq, struct request *rq_src, |
| 662 | struct bio_set *bs, gfp_t gfp_mask, |
| 663 | int (*bio_ctr)(struct bio *, struct bio *, void *), |
| 664 | void *data); |
| 665 | extern void blk_rq_unprep_clone(struct request *rq); |
Kiyoshi Ueda | 82124d6 | 2008-09-18 10:45:38 -0400 | [diff] [blame] | 666 | extern int blk_insert_cloned_request(struct request_queue *q, |
| 667 | struct request *rq); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 668 | extern void blk_plug_device(struct request_queue *); |
Jens Axboe | 6c5e0c4 | 2008-08-01 20:31:32 +0200 | [diff] [blame] | 669 | extern void blk_plug_device_unlocked(struct request_queue *); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 670 | extern int blk_remove_plug(struct request_queue *); |
| 671 | extern void blk_recount_segments(struct request_queue *, struct bio *); |
Al Viro | 74f3c8a | 2007-08-27 15:38:10 -0400 | [diff] [blame] | 672 | extern int scsi_cmd_ioctl(struct request_queue *, struct gendisk *, fmode_t, |
| 673 | unsigned int, void __user *); |
Al Viro | e915e87 | 2008-09-02 17:16:41 -0400 | [diff] [blame] | 674 | extern int sg_scsi_ioctl(struct request_queue *, struct gendisk *, fmode_t, |
| 675 | struct scsi_ioctl_command __user *); |
Andrew Morton | 3fcfab1 | 2006-10-19 23:28:16 -0700 | [diff] [blame] | 676 | |
| 677 | /* |
| 678 | * A queue has just exitted congestion. Note this in the global counter of |
| 679 | * congested queues, and wake up anyone who was waiting for requests to be |
| 680 | * put back. |
| 681 | */ |
Jens Axboe | 8aa7e84 | 2009-07-09 14:52:32 +0200 | [diff] [blame] | 682 | 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] | 683 | { |
Jens Axboe | 8aa7e84 | 2009-07-09 14:52:32 +0200 | [diff] [blame] | 684 | clear_bdi_congested(&q->backing_dev_info, sync); |
Andrew Morton | 3fcfab1 | 2006-10-19 23:28:16 -0700 | [diff] [blame] | 685 | } |
| 686 | |
| 687 | /* |
| 688 | * A queue has just entered congestion. Flag that in the queue's VM-visible |
| 689 | * state flags and increment the global gounter of congested queues. |
| 690 | */ |
Jens Axboe | 8aa7e84 | 2009-07-09 14:52:32 +0200 | [diff] [blame] | 691 | 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] | 692 | { |
Jens Axboe | 8aa7e84 | 2009-07-09 14:52:32 +0200 | [diff] [blame] | 693 | set_bdi_congested(&q->backing_dev_info, sync); |
Andrew Morton | 3fcfab1 | 2006-10-19 23:28:16 -0700 | [diff] [blame] | 694 | } |
| 695 | |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 696 | extern void blk_start_queue(struct request_queue *q); |
| 697 | extern void blk_stop_queue(struct request_queue *q); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 698 | extern void blk_sync_queue(struct request_queue *q); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 699 | extern void __blk_stop_queue(struct request_queue *q); |
Nick Piggin | 75ad23b | 2008-04-29 14:48:33 +0200 | [diff] [blame] | 700 | extern void __blk_run_queue(struct request_queue *); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 701 | extern void blk_run_queue(struct request_queue *); |
FUJITA Tomonori | a3bce90 | 2008-08-28 16:17:05 +0900 | [diff] [blame] | 702 | extern int blk_rq_map_user(struct request_queue *, struct request *, |
FUJITA Tomonori | 152e283 | 2008-08-28 16:17:06 +0900 | [diff] [blame] | 703 | struct rq_map_data *, void __user *, unsigned long, |
| 704 | gfp_t); |
Jens Axboe | 8e5cfc4 | 2006-12-19 11:12:46 +0100 | [diff] [blame] | 705 | extern int blk_rq_unmap_user(struct bio *); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 706 | extern int blk_rq_map_kern(struct request_queue *, struct request *, void *, unsigned int, gfp_t); |
| 707 | extern int blk_rq_map_user_iov(struct request_queue *, struct request *, |
FUJITA Tomonori | 152e283 | 2008-08-28 16:17:06 +0900 | [diff] [blame] | 708 | struct rq_map_data *, struct sg_iovec *, int, |
| 709 | unsigned int, gfp_t); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 710 | extern int blk_execute_rq(struct request_queue *, struct gendisk *, |
James Bottomley | 994ca9a | 2005-06-20 14:11:09 +0200 | [diff] [blame] | 711 | struct request *, int); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 712 | extern void blk_execute_rq_nowait(struct request_queue *, struct gendisk *, |
Jens Axboe | 15fc858 | 2006-01-06 10:00:50 +0100 | [diff] [blame] | 713 | struct request *, int, rq_end_io_fn *); |
Alan D. Brunelle | 2ad8b1e | 2007-11-07 14:26:56 -0500 | [diff] [blame] | 714 | extern void blk_unplug(struct request_queue *q); |
Mike Christie | 6e39b69e | 2005-11-11 05:30:24 -0600 | [diff] [blame] | 715 | |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 716 | static inline struct request_queue *bdev_get_queue(struct block_device *bdev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 717 | { |
| 718 | return bdev->bd_disk->queue; |
| 719 | } |
| 720 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 721 | /* |
Tejun Heo | 80a761f | 2009-07-03 17:48:17 +0900 | [diff] [blame] | 722 | * blk_rq_pos() : the current sector |
| 723 | * blk_rq_bytes() : bytes left in the entire request |
| 724 | * blk_rq_cur_bytes() : bytes left in the current segment |
| 725 | * blk_rq_err_bytes() : bytes left till the next error boundary |
| 726 | * blk_rq_sectors() : sectors left in the entire request |
| 727 | * blk_rq_cur_sectors() : sectors left in the current segment |
Tejun Heo | 5efccd1 | 2009-04-23 11:05:18 +0900 | [diff] [blame] | 728 | */ |
Tejun Heo | 5b93629 | 2009-05-07 22:24:38 +0900 | [diff] [blame] | 729 | static inline sector_t blk_rq_pos(const struct request *rq) |
| 730 | { |
Tejun Heo | a2dec7b | 2009-05-07 22:24:44 +0900 | [diff] [blame] | 731 | return rq->__sector; |
Tejun Heo | 5b93629 | 2009-05-07 22:24:38 +0900 | [diff] [blame] | 732 | } |
| 733 | |
Tejun Heo | 2e46e8b | 2009-05-07 22:24:41 +0900 | [diff] [blame] | 734 | static inline unsigned int blk_rq_bytes(const struct request *rq) |
| 735 | { |
Tejun Heo | a2dec7b | 2009-05-07 22:24:44 +0900 | [diff] [blame] | 736 | return rq->__data_len; |
Tejun Heo | 2e46e8b | 2009-05-07 22:24:41 +0900 | [diff] [blame] | 737 | } |
| 738 | |
| 739 | static inline int blk_rq_cur_bytes(const struct request *rq) |
| 740 | { |
| 741 | return rq->bio ? bio_cur_bytes(rq->bio) : 0; |
| 742 | } |
Tejun Heo | 5efccd1 | 2009-04-23 11:05:18 +0900 | [diff] [blame] | 743 | |
Tejun Heo | 80a761f | 2009-07-03 17:48:17 +0900 | [diff] [blame] | 744 | extern unsigned int blk_rq_err_bytes(const struct request *rq); |
| 745 | |
Tejun Heo | 5b93629 | 2009-05-07 22:24:38 +0900 | [diff] [blame] | 746 | static inline unsigned int blk_rq_sectors(const struct request *rq) |
| 747 | { |
Tejun Heo | 2e46e8b | 2009-05-07 22:24:41 +0900 | [diff] [blame] | 748 | return blk_rq_bytes(rq) >> 9; |
Tejun Heo | 5b93629 | 2009-05-07 22:24:38 +0900 | [diff] [blame] | 749 | } |
| 750 | |
| 751 | static inline unsigned int blk_rq_cur_sectors(const struct request *rq) |
| 752 | { |
Tejun Heo | 2e46e8b | 2009-05-07 22:24:41 +0900 | [diff] [blame] | 753 | return blk_rq_cur_bytes(rq) >> 9; |
Tejun Heo | 5b93629 | 2009-05-07 22:24:38 +0900 | [diff] [blame] | 754 | } |
| 755 | |
Tejun Heo | 5efccd1 | 2009-04-23 11:05:18 +0900 | [diff] [blame] | 756 | /* |
Tejun Heo | 9934c8c | 2009-05-08 11:54:16 +0900 | [diff] [blame] | 757 | * Request issue related functions. |
| 758 | */ |
| 759 | extern struct request *blk_peek_request(struct request_queue *q); |
| 760 | extern void blk_start_request(struct request *rq); |
| 761 | extern struct request *blk_fetch_request(struct request_queue *q); |
| 762 | |
| 763 | /* |
Tejun Heo | 2e60e02 | 2009-04-23 11:05:18 +0900 | [diff] [blame] | 764 | * Request completion related functions. |
| 765 | * |
| 766 | * blk_update_request() completes given number of bytes and updates |
| 767 | * the request without completing it. |
| 768 | * |
Tejun Heo | f06d9a2 | 2009-04-23 11:05:19 +0900 | [diff] [blame] | 769 | * blk_end_request() and friends. __blk_end_request() must be called |
| 770 | * with the request queue spinlock acquired. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 771 | * |
| 772 | * Several drivers define their own end_request and call |
Kiyoshi Ueda | 3bcddea | 2007-12-11 17:52:28 -0500 | [diff] [blame] | 773 | * blk_end_request() for parts of the original function. |
| 774 | * This prevents code duplication in drivers. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 775 | */ |
Tejun Heo | 2e60e02 | 2009-04-23 11:05:18 +0900 | [diff] [blame] | 776 | extern bool blk_update_request(struct request *rq, int error, |
| 777 | unsigned int nr_bytes); |
FUJITA Tomonori | b1f7449 | 2009-05-11 17:56:09 +0900 | [diff] [blame] | 778 | extern bool blk_end_request(struct request *rq, int error, |
| 779 | unsigned int nr_bytes); |
| 780 | extern void blk_end_request_all(struct request *rq, int error); |
| 781 | extern bool blk_end_request_cur(struct request *rq, int error); |
Tejun Heo | 80a761f | 2009-07-03 17:48:17 +0900 | [diff] [blame] | 782 | extern bool blk_end_request_err(struct request *rq, int error); |
FUJITA Tomonori | b1f7449 | 2009-05-11 17:56:09 +0900 | [diff] [blame] | 783 | extern bool __blk_end_request(struct request *rq, int error, |
| 784 | unsigned int nr_bytes); |
| 785 | extern void __blk_end_request_all(struct request *rq, int error); |
| 786 | extern bool __blk_end_request_cur(struct request *rq, int error); |
Tejun Heo | 80a761f | 2009-07-03 17:48:17 +0900 | [diff] [blame] | 787 | extern bool __blk_end_request_err(struct request *rq, int error); |
Tejun Heo | 2e60e02 | 2009-04-23 11:05:18 +0900 | [diff] [blame] | 788 | |
Jens Axboe | ff856ba | 2006-01-09 16:02:34 +0100 | [diff] [blame] | 789 | extern void blk_complete_request(struct request *); |
Jens Axboe | 242f9dc | 2008-09-14 05:55:09 -0700 | [diff] [blame] | 790 | extern void __blk_complete_request(struct request *); |
| 791 | extern void blk_abort_request(struct request *); |
Mike Anderson | 11914a5 | 2008-09-13 20:31:27 +0200 | [diff] [blame] | 792 | extern void blk_abort_queue(struct request_queue *); |
James Bottomley | 28018c2 | 2010-07-01 19:49:17 +0900 | [diff] [blame] | 793 | extern void blk_unprep_request(struct request *); |
Jens Axboe | ff856ba | 2006-01-09 16:02:34 +0100 | [diff] [blame] | 794 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 795 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 796 | * Access functions for manipulating queue properties |
| 797 | */ |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 798 | extern struct request_queue *blk_init_queue_node(request_fn_proc *rfn, |
Christoph Lameter | 1946089 | 2005-06-23 00:08:19 -0700 | [diff] [blame] | 799 | spinlock_t *lock, int node_id); |
Mike Snitzer | 01effb0 | 2010-05-11 08:57:42 +0200 | [diff] [blame] | 800 | extern struct request_queue *blk_init_allocated_queue_node(struct request_queue *, |
| 801 | request_fn_proc *, |
| 802 | spinlock_t *, int node_id); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 803 | extern struct request_queue *blk_init_queue(request_fn_proc *, spinlock_t *); |
Mike Snitzer | 01effb0 | 2010-05-11 08:57:42 +0200 | [diff] [blame] | 804 | extern struct request_queue *blk_init_allocated_queue(struct request_queue *, |
| 805 | request_fn_proc *, spinlock_t *); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 806 | extern void blk_cleanup_queue(struct request_queue *); |
| 807 | extern void blk_queue_make_request(struct request_queue *, make_request_fn *); |
| 808 | extern void blk_queue_bounce_limit(struct request_queue *, u64); |
Martin K. Petersen | 086fa5f | 2010-02-26 00:20:38 -0500 | [diff] [blame] | 809 | extern void blk_queue_max_hw_sectors(struct request_queue *, unsigned int); |
Martin K. Petersen | 8a78362 | 2010-02-26 00:20:39 -0500 | [diff] [blame] | 810 | extern void blk_queue_max_segments(struct request_queue *, unsigned short); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 811 | extern void blk_queue_max_segment_size(struct request_queue *, unsigned int); |
Christoph Hellwig | 67efc92 | 2009-09-30 13:54:20 +0200 | [diff] [blame] | 812 | extern void blk_queue_max_discard_sectors(struct request_queue *q, |
| 813 | unsigned int max_discard_sectors); |
Martin K. Petersen | e1defc4 | 2009-05-22 17:17:49 -0400 | [diff] [blame] | 814 | extern void blk_queue_logical_block_size(struct request_queue *, unsigned short); |
Martin K. Petersen | 892b6f9 | 2010-10-13 21:18:03 +0200 | [diff] [blame] | 815 | extern void blk_queue_physical_block_size(struct request_queue *, unsigned int); |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 816 | extern void blk_queue_alignment_offset(struct request_queue *q, |
| 817 | unsigned int alignment); |
Martin K. Petersen | 7c958e3 | 2009-07-31 11:49:11 -0400 | [diff] [blame] | 818 | 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] | 819 | 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] | 820 | 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] | 821 | 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] | 822 | extern void blk_set_default_limits(struct queue_limits *lim); |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 823 | extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b, |
| 824 | sector_t offset); |
Martin K. Petersen | 17be8c2 | 2010-01-11 03:21:49 -0500 | [diff] [blame] | 825 | extern int bdev_stack_limits(struct queue_limits *t, struct block_device *bdev, |
| 826 | sector_t offset); |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 827 | extern void disk_stack_limits(struct gendisk *disk, struct block_device *bdev, |
| 828 | sector_t offset); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 829 | 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] | 830 | extern void blk_queue_dma_pad(struct request_queue *, unsigned int); |
FUJITA Tomonori | 27f8221 | 2008-07-04 09:30:03 +0200 | [diff] [blame] | 831 | extern void blk_queue_update_dma_pad(struct request_queue *, unsigned int); |
Tejun Heo | 2fb98e8 | 2008-02-19 11:36:53 +0100 | [diff] [blame] | 832 | extern int blk_queue_dma_drain(struct request_queue *q, |
| 833 | dma_drain_needed_fn *dma_drain_needed, |
| 834 | void *buf, unsigned int size); |
Kiyoshi Ueda | ef9e3fa | 2008-10-01 16:12:15 +0200 | [diff] [blame] | 835 | 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] | 836 | extern void blk_queue_segment_boundary(struct request_queue *, unsigned long); |
| 837 | extern void blk_queue_prep_rq(struct request_queue *, prep_rq_fn *pfn); |
James Bottomley | 28018c2 | 2010-07-01 19:49:17 +0900 | [diff] [blame] | 838 | extern void blk_queue_unprep_rq(struct request_queue *, unprep_rq_fn *ufn); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 839 | extern void blk_queue_merge_bvec(struct request_queue *, merge_bvec_fn *); |
| 840 | extern void blk_queue_dma_alignment(struct request_queue *, int); |
James Bottomley | 11c3e68 | 2007-12-31 16:37:00 -0600 | [diff] [blame] | 841 | extern void blk_queue_update_dma_alignment(struct request_queue *, int); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 842 | extern void blk_queue_softirq_done(struct request_queue *, softirq_done_fn *); |
Jens Axboe | 242f9dc | 2008-09-14 05:55:09 -0700 | [diff] [blame] | 843 | extern void blk_queue_rq_timed_out(struct request_queue *, rq_timed_out_fn *); |
| 844 | extern void blk_queue_rq_timeout(struct request_queue *, unsigned int); |
Tejun Heo | 4913efe | 2010-09-03 11:56:16 +0200 | [diff] [blame] | 845 | extern void blk_queue_flush(struct request_queue *q, unsigned int flush); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 846 | extern struct backing_dev_info *blk_get_backing_dev_info(struct block_device *bdev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 847 | |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 848 | 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] | 849 | extern void blk_dump_rq_flags(struct request *, char *); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 850 | extern void generic_unplug_device(struct request_queue *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 851 | extern long nr_blockdev_pages(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 852 | |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 853 | int blk_get_queue(struct request_queue *); |
| 854 | struct request_queue *blk_alloc_queue(gfp_t); |
| 855 | struct request_queue *blk_alloc_queue_node(gfp_t, int); |
| 856 | extern void blk_put_queue(struct request_queue *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 857 | |
| 858 | /* |
| 859 | * tag stuff |
| 860 | */ |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 861 | #define blk_rq_tagged(rq) ((rq)->cmd_flags & REQ_QUEUED) |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 862 | extern int blk_queue_start_tag(struct request_queue *, struct request *); |
| 863 | extern struct request *blk_queue_find_tag(struct request_queue *, int); |
| 864 | extern void blk_queue_end_tag(struct request_queue *, struct request *); |
| 865 | extern int blk_queue_init_tags(struct request_queue *, int, struct blk_queue_tag *); |
| 866 | extern void blk_queue_free_tags(struct request_queue *); |
| 867 | extern int blk_queue_resize_tags(struct request_queue *, int); |
| 868 | extern void blk_queue_invalidate_tags(struct request_queue *); |
James Bottomley | 492dfb4 | 2006-08-30 15:48:45 -0400 | [diff] [blame] | 869 | extern struct blk_queue_tag *blk_init_tags(int); |
| 870 | extern void blk_free_tags(struct blk_queue_tag *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 871 | |
David C Somayajulu | f583f49 | 2006-10-04 08:27:25 +0200 | [diff] [blame] | 872 | static inline struct request *blk_map_queue_find_tag(struct blk_queue_tag *bqt, |
| 873 | int tag) |
| 874 | { |
| 875 | if (unlikely(bqt == NULL || tag >= bqt->real_max_depth)) |
| 876 | return NULL; |
| 877 | return bqt->tag_index[tag]; |
| 878 | } |
Christoph Hellwig | dd3932e | 2010-09-16 20:51:46 +0200 | [diff] [blame] | 879 | |
| 880 | #define BLKDEV_DISCARD_SECURE 0x01 /* secure discard */ |
| 881 | |
| 882 | extern int blkdev_issue_flush(struct block_device *, gfp_t, sector_t *); |
Dmitry Monakhov | fbd9b09 | 2010-04-28 17:55:06 +0400 | [diff] [blame] | 883 | extern int blkdev_issue_discard(struct block_device *bdev, sector_t sector, |
| 884 | sector_t nr_sects, gfp_t gfp_mask, unsigned long flags); |
Dmitry Monakhov | 3f14d79 | 2010-04-28 17:55:09 +0400 | [diff] [blame] | 885 | extern int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, |
Christoph Hellwig | dd3932e | 2010-09-16 20:51:46 +0200 | [diff] [blame] | 886 | sector_t nr_sects, gfp_t gfp_mask); |
Christoph Hellwig | 2cf6d26 | 2010-08-18 05:29:10 -0400 | [diff] [blame] | 887 | static inline int sb_issue_discard(struct super_block *sb, sector_t block, |
| 888 | sector_t nr_blocks, gfp_t gfp_mask, unsigned long flags) |
David Woodhouse | fb2dce8 | 2008-08-05 18:01:53 +0100 | [diff] [blame] | 889 | { |
Christoph Hellwig | 2cf6d26 | 2010-08-18 05:29:10 -0400 | [diff] [blame] | 890 | return blkdev_issue_discard(sb->s_bdev, block << (sb->s_blocksize_bits - 9), |
| 891 | nr_blocks << (sb->s_blocksize_bits - 9), |
| 892 | gfp_mask, flags); |
David Woodhouse | fb2dce8 | 2008-08-05 18:01:53 +0100 | [diff] [blame] | 893 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 894 | |
Jens Axboe | 018e044 | 2009-06-26 16:27:10 +0200 | [diff] [blame] | 895 | 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] | 896 | |
Martin K. Petersen | eb28d31 | 2010-02-26 00:20:37 -0500 | [diff] [blame] | 897 | enum blk_default_limits { |
| 898 | BLK_MAX_SEGMENTS = 128, |
| 899 | BLK_SAFE_MAX_SECTORS = 255, |
| 900 | BLK_DEF_MAX_SECTORS = 1024, |
| 901 | BLK_MAX_SEGMENT_SIZE = 65536, |
| 902 | BLK_SEG_BOUNDARY_MASK = 0xFFFFFFFFUL, |
| 903 | }; |
Milan Broz | 0e435ac | 2008-12-03 12:55:08 +0100 | [diff] [blame] | 904 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 905 | #define blkdev_entry_to_request(entry) list_entry((entry), struct request, queuelist) |
| 906 | |
Martin K. Petersen | ae03bf6 | 2009-05-22 17:17:50 -0400 | [diff] [blame] | 907 | static inline unsigned long queue_bounce_pfn(struct request_queue *q) |
| 908 | { |
Martin K. Petersen | 025146e | 2009-05-22 17:17:51 -0400 | [diff] [blame] | 909 | return q->limits.bounce_pfn; |
Martin K. Petersen | ae03bf6 | 2009-05-22 17:17:50 -0400 | [diff] [blame] | 910 | } |
| 911 | |
| 912 | static inline unsigned long queue_segment_boundary(struct request_queue *q) |
| 913 | { |
Martin K. Petersen | 025146e | 2009-05-22 17:17:51 -0400 | [diff] [blame] | 914 | return q->limits.seg_boundary_mask; |
Martin K. Petersen | ae03bf6 | 2009-05-22 17:17:50 -0400 | [diff] [blame] | 915 | } |
| 916 | |
| 917 | static inline unsigned int queue_max_sectors(struct request_queue *q) |
| 918 | { |
Martin K. Petersen | 025146e | 2009-05-22 17:17:51 -0400 | [diff] [blame] | 919 | return q->limits.max_sectors; |
Martin K. Petersen | ae03bf6 | 2009-05-22 17:17:50 -0400 | [diff] [blame] | 920 | } |
| 921 | |
| 922 | static inline unsigned int queue_max_hw_sectors(struct request_queue *q) |
| 923 | { |
Martin K. Petersen | 025146e | 2009-05-22 17:17:51 -0400 | [diff] [blame] | 924 | return q->limits.max_hw_sectors; |
Martin K. Petersen | ae03bf6 | 2009-05-22 17:17:50 -0400 | [diff] [blame] | 925 | } |
| 926 | |
Martin K. Petersen | 8a78362 | 2010-02-26 00:20:39 -0500 | [diff] [blame] | 927 | static inline unsigned short queue_max_segments(struct request_queue *q) |
Martin K. Petersen | ae03bf6 | 2009-05-22 17:17:50 -0400 | [diff] [blame] | 928 | { |
Martin K. Petersen | 8a78362 | 2010-02-26 00:20:39 -0500 | [diff] [blame] | 929 | return q->limits.max_segments; |
Martin K. Petersen | ae03bf6 | 2009-05-22 17:17:50 -0400 | [diff] [blame] | 930 | } |
| 931 | |
| 932 | static inline unsigned int queue_max_segment_size(struct request_queue *q) |
| 933 | { |
Martin K. Petersen | 025146e | 2009-05-22 17:17:51 -0400 | [diff] [blame] | 934 | return q->limits.max_segment_size; |
Martin K. Petersen | ae03bf6 | 2009-05-22 17:17:50 -0400 | [diff] [blame] | 935 | } |
| 936 | |
Martin K. Petersen | e1defc4 | 2009-05-22 17:17:49 -0400 | [diff] [blame] | 937 | static inline unsigned short queue_logical_block_size(struct request_queue *q) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 938 | { |
| 939 | int retval = 512; |
| 940 | |
Martin K. Petersen | 025146e | 2009-05-22 17:17:51 -0400 | [diff] [blame] | 941 | if (q && q->limits.logical_block_size) |
| 942 | retval = q->limits.logical_block_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 943 | |
| 944 | return retval; |
| 945 | } |
| 946 | |
Martin K. Petersen | e1defc4 | 2009-05-22 17:17:49 -0400 | [diff] [blame] | 947 | static inline unsigned short bdev_logical_block_size(struct block_device *bdev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 948 | { |
Martin K. Petersen | e1defc4 | 2009-05-22 17:17:49 -0400 | [diff] [blame] | 949 | return queue_logical_block_size(bdev_get_queue(bdev)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 950 | } |
| 951 | |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 952 | static inline unsigned int queue_physical_block_size(struct request_queue *q) |
| 953 | { |
| 954 | return q->limits.physical_block_size; |
| 955 | } |
| 956 | |
Martin K. Petersen | 892b6f9 | 2010-10-13 21:18:03 +0200 | [diff] [blame] | 957 | static inline unsigned int bdev_physical_block_size(struct block_device *bdev) |
Martin K. Petersen | ac481c2 | 2009-10-03 20:52:01 +0200 | [diff] [blame] | 958 | { |
| 959 | return queue_physical_block_size(bdev_get_queue(bdev)); |
| 960 | } |
| 961 | |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 962 | static inline unsigned int queue_io_min(struct request_queue *q) |
| 963 | { |
| 964 | return q->limits.io_min; |
| 965 | } |
| 966 | |
Martin K. Petersen | ac481c2 | 2009-10-03 20:52:01 +0200 | [diff] [blame] | 967 | static inline int bdev_io_min(struct block_device *bdev) |
| 968 | { |
| 969 | return queue_io_min(bdev_get_queue(bdev)); |
| 970 | } |
| 971 | |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 972 | static inline unsigned int queue_io_opt(struct request_queue *q) |
| 973 | { |
| 974 | return q->limits.io_opt; |
| 975 | } |
| 976 | |
Martin K. Petersen | ac481c2 | 2009-10-03 20:52:01 +0200 | [diff] [blame] | 977 | static inline int bdev_io_opt(struct block_device *bdev) |
| 978 | { |
| 979 | return queue_io_opt(bdev_get_queue(bdev)); |
| 980 | } |
| 981 | |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 982 | static inline int queue_alignment_offset(struct request_queue *q) |
| 983 | { |
Martin K. Petersen | ac481c2 | 2009-10-03 20:52:01 +0200 | [diff] [blame] | 984 | if (q->limits.misaligned) |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 985 | return -1; |
| 986 | |
Martin K. Petersen | ac481c2 | 2009-10-03 20:52:01 +0200 | [diff] [blame] | 987 | return q->limits.alignment_offset; |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 988 | } |
| 989 | |
Martin K. Petersen | e03a72e | 2010-01-11 03:21:51 -0500 | [diff] [blame] | 990 | static inline int queue_limit_alignment_offset(struct queue_limits *lim, sector_t sector) |
Martin K. Petersen | 81744ee | 2009-12-29 08:35:35 +0100 | [diff] [blame] | 991 | { |
| 992 | unsigned int granularity = max(lim->physical_block_size, lim->io_min); |
Martin K. Petersen | e03a72e | 2010-01-11 03:21:51 -0500 | [diff] [blame] | 993 | unsigned int alignment = (sector << 9) & (granularity - 1); |
Martin K. Petersen | 81744ee | 2009-12-29 08:35:35 +0100 | [diff] [blame] | 994 | |
Martin K. Petersen | e03a72e | 2010-01-11 03:21:51 -0500 | [diff] [blame] | 995 | return (granularity + lim->alignment_offset - alignment) |
| 996 | & (granularity - 1); |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 997 | } |
| 998 | |
Martin K. Petersen | ac481c2 | 2009-10-03 20:52:01 +0200 | [diff] [blame] | 999 | static inline int bdev_alignment_offset(struct block_device *bdev) |
| 1000 | { |
| 1001 | struct request_queue *q = bdev_get_queue(bdev); |
| 1002 | |
| 1003 | if (q->limits.misaligned) |
| 1004 | return -1; |
| 1005 | |
| 1006 | if (bdev != bdev->bd_contains) |
| 1007 | return bdev->bd_part->alignment_offset; |
| 1008 | |
| 1009 | return q->limits.alignment_offset; |
| 1010 | } |
| 1011 | |
Martin K. Petersen | 86b3728 | 2009-11-10 11:50:21 +0100 | [diff] [blame] | 1012 | static inline int queue_discard_alignment(struct request_queue *q) |
| 1013 | { |
| 1014 | if (q->limits.discard_misaligned) |
| 1015 | return -1; |
| 1016 | |
| 1017 | return q->limits.discard_alignment; |
| 1018 | } |
| 1019 | |
Martin K. Petersen | e03a72e | 2010-01-11 03:21:51 -0500 | [diff] [blame] | 1020 | static inline int queue_limit_discard_alignment(struct queue_limits *lim, sector_t sector) |
Martin K. Petersen | 86b3728 | 2009-11-10 11:50:21 +0100 | [diff] [blame] | 1021 | { |
Martin K. Petersen | dd3d145 | 2010-01-11 03:21:48 -0500 | [diff] [blame] | 1022 | unsigned int alignment = (sector << 9) & (lim->discard_granularity - 1); |
| 1023 | |
| 1024 | return (lim->discard_granularity + lim->discard_alignment - alignment) |
| 1025 | & (lim->discard_granularity - 1); |
Martin K. Petersen | 86b3728 | 2009-11-10 11:50:21 +0100 | [diff] [blame] | 1026 | } |
| 1027 | |
Martin K. Petersen | 98262f2 | 2009-12-03 09:24:48 +0100 | [diff] [blame] | 1028 | static inline unsigned int queue_discard_zeroes_data(struct request_queue *q) |
| 1029 | { |
| 1030 | if (q->limits.discard_zeroes_data == 1) |
| 1031 | return 1; |
| 1032 | |
| 1033 | return 0; |
| 1034 | } |
| 1035 | |
| 1036 | static inline unsigned int bdev_discard_zeroes_data(struct block_device *bdev) |
| 1037 | { |
| 1038 | return queue_discard_zeroes_data(bdev_get_queue(bdev)); |
| 1039 | } |
| 1040 | |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 1041 | static inline int queue_dma_alignment(struct request_queue *q) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1042 | { |
Pete Wyckoff | 482eb68 | 2008-01-01 10:23:02 -0500 | [diff] [blame] | 1043 | return q ? q->dma_alignment : 511; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1044 | } |
| 1045 | |
Namhyung Kim | 1441779 | 2010-09-15 13:08:27 +0200 | [diff] [blame] | 1046 | static inline int blk_rq_aligned(struct request_queue *q, unsigned long addr, |
FUJITA Tomonori | 8790407 | 2008-08-28 15:05:58 +0900 | [diff] [blame] | 1047 | unsigned int len) |
| 1048 | { |
| 1049 | unsigned int alignment = queue_dma_alignment(q) | q->dma_pad_mask; |
Namhyung Kim | 1441779 | 2010-09-15 13:08:27 +0200 | [diff] [blame] | 1050 | return !(addr & alignment) && !(len & alignment); |
FUJITA Tomonori | 8790407 | 2008-08-28 15:05:58 +0900 | [diff] [blame] | 1051 | } |
| 1052 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1053 | /* assumes size > 256 */ |
| 1054 | static inline unsigned int blksize_bits(unsigned int size) |
| 1055 | { |
| 1056 | unsigned int bits = 8; |
| 1057 | do { |
| 1058 | bits++; |
| 1059 | size >>= 1; |
| 1060 | } while (size > 256); |
| 1061 | return bits; |
| 1062 | } |
| 1063 | |
Adrian Bunk | 2befb9e | 2005-09-10 00:27:17 -0700 | [diff] [blame] | 1064 | static inline unsigned int block_size(struct block_device *bdev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1065 | { |
| 1066 | return bdev->bd_block_size; |
| 1067 | } |
| 1068 | |
| 1069 | typedef struct {struct page *v;} Sector; |
| 1070 | |
| 1071 | unsigned char *read_dev_sector(struct block_device *, sector_t, Sector *); |
| 1072 | |
| 1073 | static inline void put_dev_sector(Sector p) |
| 1074 | { |
| 1075 | page_cache_release(p.v); |
| 1076 | } |
| 1077 | |
| 1078 | struct work_struct; |
Jens Axboe | 18887ad | 2008-07-28 13:08:45 +0200 | [diff] [blame] | 1079 | int kblockd_schedule_work(struct request_queue *q, struct work_struct *work); |
Vivek Goyal | e43473b | 2010-09-15 17:06:35 -0400 | [diff] [blame] | 1080 | int kblockd_schedule_delayed_work(struct request_queue *q, struct delayed_work *dwork, unsigned long delay); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1081 | |
Divyesh Shah | 9195291 | 2010-04-01 15:01:41 -0700 | [diff] [blame] | 1082 | #ifdef CONFIG_BLK_CGROUP |
Jens Axboe | 28f4197 | 2010-06-01 12:23:18 +0200 | [diff] [blame] | 1083 | /* |
| 1084 | * This should not be using sched_clock(). A real patch is in progress |
| 1085 | * to fix this up, until that is in place we need to disable preemption |
| 1086 | * around sched_clock() in this function and set_io_start_time_ns(). |
| 1087 | */ |
Divyesh Shah | 9195291 | 2010-04-01 15:01:41 -0700 | [diff] [blame] | 1088 | static inline void set_start_time_ns(struct request *req) |
| 1089 | { |
Jens Axboe | 28f4197 | 2010-06-01 12:23:18 +0200 | [diff] [blame] | 1090 | preempt_disable(); |
Divyesh Shah | 9195291 | 2010-04-01 15:01:41 -0700 | [diff] [blame] | 1091 | req->start_time_ns = sched_clock(); |
Jens Axboe | 28f4197 | 2010-06-01 12:23:18 +0200 | [diff] [blame] | 1092 | preempt_enable(); |
Divyesh Shah | 9195291 | 2010-04-01 15:01:41 -0700 | [diff] [blame] | 1093 | } |
| 1094 | |
| 1095 | static inline void set_io_start_time_ns(struct request *req) |
| 1096 | { |
Jens Axboe | 28f4197 | 2010-06-01 12:23:18 +0200 | [diff] [blame] | 1097 | preempt_disable(); |
Divyesh Shah | 9195291 | 2010-04-01 15:01:41 -0700 | [diff] [blame] | 1098 | req->io_start_time_ns = sched_clock(); |
Jens Axboe | 28f4197 | 2010-06-01 12:23:18 +0200 | [diff] [blame] | 1099 | preempt_enable(); |
Divyesh Shah | 9195291 | 2010-04-01 15:01:41 -0700 | [diff] [blame] | 1100 | } |
Divyesh Shah | 84c124d | 2010-04-09 08:31:19 +0200 | [diff] [blame] | 1101 | |
| 1102 | static inline uint64_t rq_start_time_ns(struct request *req) |
| 1103 | { |
| 1104 | return req->start_time_ns; |
| 1105 | } |
| 1106 | |
| 1107 | static inline uint64_t rq_io_start_time_ns(struct request *req) |
| 1108 | { |
| 1109 | return req->io_start_time_ns; |
| 1110 | } |
Divyesh Shah | 9195291 | 2010-04-01 15:01:41 -0700 | [diff] [blame] | 1111 | #else |
| 1112 | static inline void set_start_time_ns(struct request *req) {} |
| 1113 | static inline void set_io_start_time_ns(struct request *req) {} |
Divyesh Shah | 84c124d | 2010-04-09 08:31:19 +0200 | [diff] [blame] | 1114 | static inline uint64_t rq_start_time_ns(struct request *req) |
| 1115 | { |
| 1116 | return 0; |
| 1117 | } |
| 1118 | static inline uint64_t rq_io_start_time_ns(struct request *req) |
| 1119 | { |
| 1120 | return 0; |
| 1121 | } |
Divyesh Shah | 9195291 | 2010-04-01 15:01:41 -0700 | [diff] [blame] | 1122 | #endif |
| 1123 | |
Vivek Goyal | e43473b | 2010-09-15 17:06:35 -0400 | [diff] [blame] | 1124 | #ifdef CONFIG_BLK_DEV_THROTTLING |
| 1125 | extern int blk_throtl_init(struct request_queue *q); |
| 1126 | extern void blk_throtl_exit(struct request_queue *q); |
| 1127 | extern int blk_throtl_bio(struct request_queue *q, struct bio **bio); |
| 1128 | extern void throtl_schedule_delayed_work(struct request_queue *q, unsigned long delay); |
| 1129 | extern void throtl_shutdown_timer_wq(struct request_queue *q); |
| 1130 | #else /* CONFIG_BLK_DEV_THROTTLING */ |
| 1131 | static inline int blk_throtl_bio(struct request_queue *q, struct bio **bio) |
| 1132 | { |
| 1133 | return 0; |
| 1134 | } |
| 1135 | |
| 1136 | static inline int blk_throtl_init(struct request_queue *q) { return 0; } |
| 1137 | static inline int blk_throtl_exit(struct request_queue *q) { return 0; } |
| 1138 | static inline void throtl_schedule_delayed_work(struct request_queue *q, unsigned long delay) {} |
| 1139 | static inline void throtl_shutdown_timer_wq(struct request_queue *q) {} |
| 1140 | #endif /* CONFIG_BLK_DEV_THROTTLING */ |
| 1141 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1142 | #define MODULE_ALIAS_BLOCKDEV(major,minor) \ |
| 1143 | MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor)) |
| 1144 | #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \ |
| 1145 | MODULE_ALIAS("block-major-" __stringify(major) "-*") |
| 1146 | |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 1147 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
| 1148 | |
Jens Axboe | b24498d | 2008-06-27 09:12:09 +0200 | [diff] [blame] | 1149 | #define INTEGRITY_FLAG_READ 2 /* verify data integrity on read */ |
| 1150 | #define INTEGRITY_FLAG_WRITE 4 /* generate data integrity on write */ |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 1151 | |
| 1152 | struct blk_integrity_exchg { |
| 1153 | void *prot_buf; |
| 1154 | void *data_buf; |
| 1155 | sector_t sector; |
| 1156 | unsigned int data_size; |
| 1157 | unsigned short sector_size; |
| 1158 | const char *disk_name; |
| 1159 | }; |
| 1160 | |
| 1161 | typedef void (integrity_gen_fn) (struct blk_integrity_exchg *); |
| 1162 | typedef int (integrity_vrfy_fn) (struct blk_integrity_exchg *); |
| 1163 | typedef void (integrity_set_tag_fn) (void *, void *, unsigned int); |
| 1164 | typedef void (integrity_get_tag_fn) (void *, void *, unsigned int); |
| 1165 | |
| 1166 | struct blk_integrity { |
| 1167 | integrity_gen_fn *generate_fn; |
| 1168 | integrity_vrfy_fn *verify_fn; |
| 1169 | integrity_set_tag_fn *set_tag_fn; |
| 1170 | integrity_get_tag_fn *get_tag_fn; |
| 1171 | |
| 1172 | unsigned short flags; |
| 1173 | unsigned short tuple_size; |
| 1174 | unsigned short sector_size; |
| 1175 | unsigned short tag_size; |
| 1176 | |
| 1177 | const char *name; |
| 1178 | |
| 1179 | struct kobject kobj; |
| 1180 | }; |
| 1181 | |
| 1182 | extern int blk_integrity_register(struct gendisk *, struct blk_integrity *); |
| 1183 | extern void blk_integrity_unregister(struct gendisk *); |
Martin K. Petersen | ad7fce9 | 2008-10-01 03:38:39 -0400 | [diff] [blame] | 1184 | extern int blk_integrity_compare(struct gendisk *, struct gendisk *); |
Martin K. Petersen | 13f05c8 | 2010-09-10 20:50:10 +0200 | [diff] [blame] | 1185 | extern int blk_rq_map_integrity_sg(struct request_queue *, struct bio *, |
| 1186 | struct scatterlist *); |
| 1187 | extern int blk_rq_count_integrity_sg(struct request_queue *, struct bio *); |
| 1188 | extern int blk_integrity_merge_rq(struct request_queue *, struct request *, |
| 1189 | struct request *); |
| 1190 | extern int blk_integrity_merge_bio(struct request_queue *, struct request *, |
| 1191 | struct bio *); |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 1192 | |
Jens Axboe | b04accc | 2008-10-02 12:53:22 +0200 | [diff] [blame] | 1193 | static inline |
| 1194 | struct blk_integrity *bdev_get_integrity(struct block_device *bdev) |
| 1195 | { |
| 1196 | return bdev->bd_disk->integrity; |
| 1197 | } |
| 1198 | |
Martin K. Petersen | b02739b | 2008-10-02 18:47:49 +0200 | [diff] [blame] | 1199 | static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk) |
| 1200 | { |
| 1201 | return disk->integrity; |
| 1202 | } |
| 1203 | |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 1204 | static inline int blk_integrity_rq(struct request *rq) |
| 1205 | { |
Martin K. Petersen | d442cc4 | 2008-07-16 16:09:06 -0400 | [diff] [blame] | 1206 | if (rq->bio == NULL) |
| 1207 | return 0; |
| 1208 | |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 1209 | return bio_integrity(rq->bio); |
| 1210 | } |
| 1211 | |
Martin K. Petersen | 13f05c8 | 2010-09-10 20:50:10 +0200 | [diff] [blame] | 1212 | static inline void blk_queue_max_integrity_segments(struct request_queue *q, |
| 1213 | unsigned int segs) |
| 1214 | { |
| 1215 | q->limits.max_integrity_segments = segs; |
| 1216 | } |
| 1217 | |
| 1218 | static inline unsigned short |
| 1219 | queue_max_integrity_segments(struct request_queue *q) |
| 1220 | { |
| 1221 | return q->limits.max_integrity_segments; |
| 1222 | } |
| 1223 | |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 1224 | #else /* CONFIG_BLK_DEV_INTEGRITY */ |
| 1225 | |
| 1226 | #define blk_integrity_rq(rq) (0) |
Martin K. Petersen | 13f05c8 | 2010-09-10 20:50:10 +0200 | [diff] [blame] | 1227 | #define blk_rq_count_integrity_sg(a, b) (0) |
| 1228 | #define blk_rq_map_integrity_sg(a, b, c) (0) |
Jens Axboe | b04accc | 2008-10-02 12:53:22 +0200 | [diff] [blame] | 1229 | #define bdev_get_integrity(a) (0) |
Martin K. Petersen | b02739b | 2008-10-02 18:47:49 +0200 | [diff] [blame] | 1230 | #define blk_get_integrity(a) (0) |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 1231 | #define blk_integrity_compare(a, b) (0) |
| 1232 | #define blk_integrity_register(a, b) (0) |
| 1233 | #define blk_integrity_unregister(a) do { } while (0); |
Martin K. Petersen | 13f05c8 | 2010-09-10 20:50:10 +0200 | [diff] [blame] | 1234 | #define blk_queue_max_integrity_segments(a, b) do { } while (0); |
| 1235 | #define queue_max_integrity_segments(a) (0) |
| 1236 | #define blk_integrity_merge_rq(a, b, c) (0) |
| 1237 | #define blk_integrity_merge_bio(a, b, c) (0) |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 1238 | |
| 1239 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ |
| 1240 | |
Al Viro | 08f8585 | 2007-10-08 13:26:20 -0400 | [diff] [blame] | 1241 | struct block_device_operations { |
Al Viro | d4430d62 | 2008-03-02 09:09:22 -0500 | [diff] [blame] | 1242 | int (*open) (struct block_device *, fmode_t); |
| 1243 | int (*release) (struct gendisk *, fmode_t); |
Al Viro | d4430d62 | 2008-03-02 09:09:22 -0500 | [diff] [blame] | 1244 | int (*ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); |
| 1245 | int (*compat_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); |
Al Viro | 08f8585 | 2007-10-08 13:26:20 -0400 | [diff] [blame] | 1246 | int (*direct_access) (struct block_device *, sector_t, |
| 1247 | void **, unsigned long *); |
| 1248 | int (*media_changed) (struct gendisk *); |
Tejun Heo | c3e33e0 | 2010-05-15 20:09:29 +0200 | [diff] [blame] | 1249 | void (*unlock_native_capacity) (struct gendisk *); |
Al Viro | 08f8585 | 2007-10-08 13:26:20 -0400 | [diff] [blame] | 1250 | int (*revalidate_disk) (struct gendisk *); |
| 1251 | int (*getgeo)(struct block_device *, struct hd_geometry *); |
Nitin Gupta | b3a27d0 | 2010-05-17 11:02:43 +0530 | [diff] [blame] | 1252 | /* this callback is with swap_lock and sometimes page table lock held */ |
| 1253 | void (*swap_slot_free_notify) (struct block_device *, unsigned long); |
Al Viro | 08f8585 | 2007-10-08 13:26:20 -0400 | [diff] [blame] | 1254 | struct module *owner; |
| 1255 | }; |
| 1256 | |
Al Viro | 633a08b | 2007-08-29 20:34:12 -0400 | [diff] [blame] | 1257 | extern int __blkdev_driver_ioctl(struct block_device *, fmode_t, unsigned int, |
| 1258 | unsigned long); |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 1259 | #else /* CONFIG_BLOCK */ |
| 1260 | /* |
| 1261 | * stubs for when the block layer is configured out |
| 1262 | */ |
| 1263 | #define buffer_heads_over_limit 0 |
| 1264 | |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 1265 | static inline long nr_blockdev_pages(void) |
| 1266 | { |
| 1267 | return 0; |
| 1268 | } |
| 1269 | |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 1270 | #endif /* CONFIG_BLOCK */ |
| 1271 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1272 | #endif |