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Commit | Line | Data |
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7cc01581 TH |
1 | /* |
2 | * Block data types and constants. Directly include this file only to | |
3 | * break include dependency loop. | |
4 | */ | |
5 | #ifndef __LINUX_BLK_TYPES_H | |
6 | #define __LINUX_BLK_TYPES_H | |
7 | ||
7cc01581 | 8 | #include <linux/types.h> |
0781e79e | 9 | #include <linux/bvec.h> |
7cc01581 TH |
10 | |
11 | struct bio_set; | |
12 | struct bio; | |
13 | struct bio_integrity_payload; | |
14 | struct page; | |
15 | struct block_device; | |
852c788f TH |
16 | struct io_context; |
17 | struct cgroup_subsys_state; | |
4246a0b6 | 18 | typedef void (bio_end_io_t) (struct bio *); |
7cc01581 | 19 | |
2a842aca CH |
20 | /* |
21 | * Block error status values. See block/blk-core:blk_errors for the details. | |
22 | */ | |
23 | typedef u8 __bitwise blk_status_t; | |
24 | #define BLK_STS_OK 0 | |
25 | #define BLK_STS_NOTSUPP ((__force blk_status_t)1) | |
26 | #define BLK_STS_TIMEOUT ((__force blk_status_t)2) | |
27 | #define BLK_STS_NOSPC ((__force blk_status_t)3) | |
28 | #define BLK_STS_TRANSPORT ((__force blk_status_t)4) | |
29 | #define BLK_STS_TARGET ((__force blk_status_t)5) | |
30 | #define BLK_STS_NEXUS ((__force blk_status_t)6) | |
31 | #define BLK_STS_MEDIUM ((__force blk_status_t)7) | |
32 | #define BLK_STS_PROTECTION ((__force blk_status_t)8) | |
33 | #define BLK_STS_RESOURCE ((__force blk_status_t)9) | |
34 | #define BLK_STS_IOERR ((__force blk_status_t)10) | |
35 | ||
b9147dd1 SL |
36 | struct blk_issue_stat { |
37 | u64 stat; | |
38 | }; | |
39 | ||
7cc01581 TH |
40 | /* |
41 | * main unit of I/O for the block layer and lower layers (ie drivers and | |
42 | * stacking drivers) | |
43 | */ | |
44 | struct bio { | |
7cc01581 TH |
45 | struct bio *bi_next; /* request queue link */ |
46 | struct block_device *bi_bdev; | |
2c68f6dc | 47 | int bi_error; |
1eff9d32 JA |
48 | unsigned int bi_opf; /* bottom bits req flags, |
49 | * top bits REQ_OP. Use | |
50 | * accessors. | |
4e1b2d52 | 51 | */ |
dbde775c | 52 | unsigned short bi_flags; /* status, etc and bvec pool number */ |
43b62ce3 | 53 | unsigned short bi_ioprio; |
7cc01581 | 54 | |
4f024f37 | 55 | struct bvec_iter bi_iter; |
7cc01581 TH |
56 | |
57 | /* Number of segments in this BIO after | |
58 | * physical address coalescing is performed. | |
59 | */ | |
60 | unsigned int bi_phys_segments; | |
61 | ||
7cc01581 TH |
62 | /* |
63 | * To keep track of the max segment size, we account for the | |
64 | * sizes of the first and last mergeable segments in this bio. | |
65 | */ | |
66 | unsigned int bi_seg_front_size; | |
67 | unsigned int bi_seg_back_size; | |
68 | ||
c4cf5261 | 69 | atomic_t __bi_remaining; |
196d38bc | 70 | |
7cc01581 TH |
71 | bio_end_io_t *bi_end_io; |
72 | ||
73 | void *bi_private; | |
852c788f TH |
74 | #ifdef CONFIG_BLK_CGROUP |
75 | /* | |
76 | * Optional ioc and css associated with this bio. Put on bio | |
77 | * release. Read comment on top of bio_associate_current(). | |
78 | */ | |
79 | struct io_context *bi_ioc; | |
80 | struct cgroup_subsys_state *bi_css; | |
9e234eea SL |
81 | #ifdef CONFIG_BLK_DEV_THROTTLING_LOW |
82 | void *bi_cg_private; | |
b9147dd1 | 83 | struct blk_issue_stat bi_issue_stat; |
9e234eea | 84 | #endif |
852c788f | 85 | #endif |
180b2f95 | 86 | union { |
7cc01581 | 87 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
180b2f95 | 88 | struct bio_integrity_payload *bi_integrity; /* data integrity */ |
7cc01581 | 89 | #endif |
180b2f95 | 90 | }; |
7cc01581 | 91 | |
4f024f37 KO |
92 | unsigned short bi_vcnt; /* how many bio_vec's */ |
93 | ||
f44b48c7 KO |
94 | /* |
95 | * Everything starting with bi_max_vecs will be preserved by bio_reset() | |
96 | */ | |
97 | ||
4f024f37 | 98 | unsigned short bi_max_vecs; /* max bvl_vecs we can hold */ |
f44b48c7 | 99 | |
dac56212 | 100 | atomic_t __bi_cnt; /* pin count */ |
f44b48c7 KO |
101 | |
102 | struct bio_vec *bi_io_vec; /* the actual vec list */ | |
103 | ||
395c72a7 KO |
104 | struct bio_set *bi_pool; |
105 | ||
7cc01581 TH |
106 | /* |
107 | * We can inline a number of vecs at the end of the bio, to avoid | |
108 | * double allocations for a small number of bio_vecs. This member | |
109 | * MUST obviously be kept at the very end of the bio. | |
110 | */ | |
111 | struct bio_vec bi_inline_vecs[0]; | |
112 | }; | |
113 | ||
f44b48c7 KO |
114 | #define BIO_RESET_BYTES offsetof(struct bio, bi_max_vecs) |
115 | ||
7cc01581 TH |
116 | /* |
117 | * bio flags | |
118 | */ | |
b2dbe0a6 JA |
119 | #define BIO_SEG_VALID 1 /* bi_phys_segments valid */ |
120 | #define BIO_CLONED 2 /* doesn't own data */ | |
121 | #define BIO_BOUNCED 3 /* bio is a bounce bio */ | |
122 | #define BIO_USER_MAPPED 4 /* contains user pages */ | |
123 | #define BIO_NULL_MAPPED 5 /* contains invalid user pages */ | |
124 | #define BIO_QUIET 6 /* Make BIO Quiet */ | |
a3ad0a9d JK |
125 | #define BIO_CHAIN 7 /* chained bio, ->bi_remaining in effect */ |
126 | #define BIO_REFFED 8 /* bio has elevated ->bi_cnt */ | |
8d2bbd4c CH |
127 | #define BIO_THROTTLED 9 /* This bio has already been subjected to |
128 | * throttling rules. Don't do it again. */ | |
fbbaf700 N |
129 | #define BIO_TRACE_COMPLETION 10 /* bio_endio() should trace the final completion |
130 | * of this bio. */ | |
dbde775c | 131 | /* See BVEC_POOL_OFFSET below before adding new flags */ |
f44b48c7 | 132 | |
7cc01581 | 133 | /* |
ed996a52 CH |
134 | * We support 6 different bvec pools, the last one is magic in that it |
135 | * is backed by a mempool. | |
7cc01581 | 136 | */ |
ed996a52 CH |
137 | #define BVEC_POOL_NR 6 |
138 | #define BVEC_POOL_MAX (BVEC_POOL_NR - 1) | |
139 | ||
140 | /* | |
dbde775c | 141 | * Top 3 bits of bio flags indicate the pool the bvecs came from. We add |
ed996a52 CH |
142 | * 1 to the actual index so that 0 indicates that there are no bvecs to be |
143 | * freed. | |
144 | */ | |
dbde775c | 145 | #define BVEC_POOL_BITS (3) |
c0acf12a | 146 | #define BVEC_POOL_OFFSET (16 - BVEC_POOL_BITS) |
ed996a52 | 147 | #define BVEC_POOL_IDX(bio) ((bio)->bi_flags >> BVEC_POOL_OFFSET) |
dbde775c N |
148 | #if (1<< BVEC_POOL_BITS) < (BVEC_POOL_NR+1) |
149 | # error "BVEC_POOL_BITS is too small" | |
150 | #endif | |
151 | ||
152 | /* | |
153 | * Flags starting here get preserved by bio_reset() - this includes | |
154 | * only BVEC_POOL_IDX() | |
155 | */ | |
156 | #define BIO_RESET_BITS BVEC_POOL_OFFSET | |
7cc01581 TH |
157 | |
158 | /* | |
ef295ecf CH |
159 | * Operations and flags common to the bio and request structures. |
160 | * We use 8 bits for encoding the operation, and the remaining 24 for flags. | |
87374179 CH |
161 | * |
162 | * The least significant bit of the operation number indicates the data | |
163 | * transfer direction: | |
164 | * | |
165 | * - if the least significant bit is set transfers are TO the device | |
166 | * - if the least significant bit is not set transfers are FROM the device | |
167 | * | |
168 | * If a operation does not transfer data the least significant bit has no | |
169 | * meaning. | |
7cc01581 | 170 | */ |
ef295ecf CH |
171 | #define REQ_OP_BITS 8 |
172 | #define REQ_OP_MASK ((1 << REQ_OP_BITS) - 1) | |
173 | #define REQ_FLAG_BITS 24 | |
174 | ||
175 | enum req_opf { | |
87374179 CH |
176 | /* read sectors from the device */ |
177 | REQ_OP_READ = 0, | |
178 | /* write sectors to the device */ | |
179 | REQ_OP_WRITE = 1, | |
180 | /* flush the volatile write cache */ | |
181 | REQ_OP_FLUSH = 2, | |
182 | /* discard sectors */ | |
183 | REQ_OP_DISCARD = 3, | |
184 | /* get zone information */ | |
185 | REQ_OP_ZONE_REPORT = 4, | |
186 | /* securely erase sectors */ | |
187 | REQ_OP_SECURE_ERASE = 5, | |
188 | /* seset a zone write pointer */ | |
189 | REQ_OP_ZONE_RESET = 6, | |
190 | /* write the same sector many times */ | |
191 | REQ_OP_WRITE_SAME = 7, | |
a6f0788e | 192 | /* write the zero filled sector many times */ |
1d62ac13 | 193 | REQ_OP_WRITE_ZEROES = 9, |
ef295ecf | 194 | |
aebf526b CH |
195 | /* SCSI passthrough using struct scsi_request */ |
196 | REQ_OP_SCSI_IN = 32, | |
197 | REQ_OP_SCSI_OUT = 33, | |
198 | /* Driver private requests */ | |
199 | REQ_OP_DRV_IN = 34, | |
200 | REQ_OP_DRV_OUT = 35, | |
201 | ||
ef295ecf CH |
202 | REQ_OP_LAST, |
203 | }; | |
204 | ||
205 | enum req_flag_bits { | |
206 | __REQ_FAILFAST_DEV = /* no driver retries of device errors */ | |
207 | REQ_OP_BITS, | |
7cc01581 TH |
208 | __REQ_FAILFAST_TRANSPORT, /* no driver retries of transport errors */ |
209 | __REQ_FAILFAST_DRIVER, /* no driver retries of driver errors */ | |
7cc01581 TH |
210 | __REQ_SYNC, /* request is sync (sync write or read) */ |
211 | __REQ_META, /* metadata io request */ | |
65299a3b | 212 | __REQ_PRIO, /* boost priority in cfq */ |
bd1c1c21 | 213 | __REQ_NOMERGE, /* don't touch this for merging */ |
a2b80967 | 214 | __REQ_IDLE, /* anticipate more IO after this one */ |
180b2f95 | 215 | __REQ_INTEGRITY, /* I/O includes block integrity payload */ |
8e4bf844 | 216 | __REQ_FUA, /* forced unit access */ |
28a8f0d3 | 217 | __REQ_PREFLUSH, /* request for cache flush */ |
188bd2b1 | 218 | __REQ_RAHEAD, /* read ahead, can fail anytime */ |
1d796d6a | 219 | __REQ_BACKGROUND, /* background IO */ |
d928be9f CH |
220 | |
221 | /* command specific flags for REQ_OP_WRITE_ZEROES: */ | |
222 | __REQ_NOUNMAP, /* do not free blocks when zeroing */ | |
223 | ||
7cc01581 TH |
224 | __REQ_NR_BITS, /* stops here */ |
225 | }; | |
226 | ||
5953316d JA |
227 | #define REQ_FAILFAST_DEV (1ULL << __REQ_FAILFAST_DEV) |
228 | #define REQ_FAILFAST_TRANSPORT (1ULL << __REQ_FAILFAST_TRANSPORT) | |
229 | #define REQ_FAILFAST_DRIVER (1ULL << __REQ_FAILFAST_DRIVER) | |
230 | #define REQ_SYNC (1ULL << __REQ_SYNC) | |
231 | #define REQ_META (1ULL << __REQ_META) | |
232 | #define REQ_PRIO (1ULL << __REQ_PRIO) | |
ef295ecf | 233 | #define REQ_NOMERGE (1ULL << __REQ_NOMERGE) |
a2b80967 | 234 | #define REQ_IDLE (1ULL << __REQ_IDLE) |
180b2f95 | 235 | #define REQ_INTEGRITY (1ULL << __REQ_INTEGRITY) |
ef295ecf CH |
236 | #define REQ_FUA (1ULL << __REQ_FUA) |
237 | #define REQ_PREFLUSH (1ULL << __REQ_PREFLUSH) | |
238 | #define REQ_RAHEAD (1ULL << __REQ_RAHEAD) | |
1d796d6a | 239 | #define REQ_BACKGROUND (1ULL << __REQ_BACKGROUND) |
7cc01581 | 240 | |
d928be9f CH |
241 | #define REQ_NOUNMAP (1ULL << __REQ_NOUNMAP) |
242 | ||
7cc01581 TH |
243 | #define REQ_FAILFAST_MASK \ |
244 | (REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT | REQ_FAILFAST_DRIVER) | |
7cc01581 | 245 | |
e2a60da7 | 246 | #define REQ_NOMERGE_FLAGS \ |
e8064021 | 247 | (REQ_NOMERGE | REQ_PREFLUSH | REQ_FUA) |
e2a60da7 | 248 | |
ef295ecf CH |
249 | #define bio_op(bio) \ |
250 | ((bio)->bi_opf & REQ_OP_MASK) | |
251 | #define req_op(req) \ | |
252 | ((req)->cmd_flags & REQ_OP_MASK) | |
7cc01581 | 253 | |
ef295ecf | 254 | /* obsolete, don't use in new code */ |
93c5bdf7 CH |
255 | static inline void bio_set_op_attrs(struct bio *bio, unsigned op, |
256 | unsigned op_flags) | |
257 | { | |
258 | bio->bi_opf = op | op_flags; | |
259 | } | |
c11f0c0b | 260 | |
87374179 CH |
261 | static inline bool op_is_write(unsigned int op) |
262 | { | |
263 | return (op & 1); | |
264 | } | |
265 | ||
f73f44eb CH |
266 | /* |
267 | * Check if the bio or request is one that needs special treatment in the | |
268 | * flush state machine. | |
269 | */ | |
270 | static inline bool op_is_flush(unsigned int op) | |
271 | { | |
272 | return op & (REQ_FUA | REQ_PREFLUSH); | |
273 | } | |
274 | ||
b685d3d6 CH |
275 | /* |
276 | * Reads are always treated as synchronous, as are requests with the FUA or | |
277 | * PREFLUSH flag. Other operations may be marked as synchronous using the | |
278 | * REQ_SYNC flag. | |
279 | */ | |
ef295ecf CH |
280 | static inline bool op_is_sync(unsigned int op) |
281 | { | |
b685d3d6 CH |
282 | return (op & REQ_OP_MASK) == REQ_OP_READ || |
283 | (op & (REQ_SYNC | REQ_FUA | REQ_PREFLUSH)); | |
ef295ecf | 284 | } |
c11f0c0b | 285 | |
dece1635 | 286 | typedef unsigned int blk_qc_t; |
fd2d3326 JA |
287 | #define BLK_QC_T_NONE -1U |
288 | #define BLK_QC_T_SHIFT 16 | |
289 | #define BLK_QC_T_INTERNAL (1U << 31) | |
dece1635 JA |
290 | |
291 | static inline bool blk_qc_t_valid(blk_qc_t cookie) | |
292 | { | |
293 | return cookie != BLK_QC_T_NONE; | |
294 | } | |
295 | ||
fd2d3326 JA |
296 | static inline blk_qc_t blk_tag_to_qc_t(unsigned int tag, unsigned int queue_num, |
297 | bool internal) | |
dece1635 | 298 | { |
fd2d3326 JA |
299 | blk_qc_t ret = tag | (queue_num << BLK_QC_T_SHIFT); |
300 | ||
301 | if (internal) | |
302 | ret |= BLK_QC_T_INTERNAL; | |
303 | ||
304 | return ret; | |
dece1635 JA |
305 | } |
306 | ||
307 | static inline unsigned int blk_qc_t_to_queue_num(blk_qc_t cookie) | |
308 | { | |
fd2d3326 | 309 | return (cookie & ~BLK_QC_T_INTERNAL) >> BLK_QC_T_SHIFT; |
dece1635 JA |
310 | } |
311 | ||
312 | static inline unsigned int blk_qc_t_to_tag(blk_qc_t cookie) | |
313 | { | |
e3a7a3bf | 314 | return cookie & ((1u << BLK_QC_T_SHIFT) - 1); |
dece1635 JA |
315 | } |
316 | ||
fd2d3326 JA |
317 | static inline bool blk_qc_t_is_internal(blk_qc_t cookie) |
318 | { | |
319 | return (cookie & BLK_QC_T_INTERNAL) != 0; | |
320 | } | |
321 | ||
cf43e6be JA |
322 | struct blk_rq_stat { |
323 | s64 mean; | |
324 | u64 min; | |
325 | u64 max; | |
326 | s32 nr_samples; | |
327 | s32 nr_batch; | |
328 | u64 batch; | |
cf43e6be JA |
329 | }; |
330 | ||
7cc01581 | 331 | #endif /* __LINUX_BLK_TYPES_H */ |