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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 TH |
8 | #include <linux/types.h> |
9 | ||
10 | struct bio_set; | |
11 | struct bio; | |
12 | struct bio_integrity_payload; | |
13 | struct page; | |
14 | struct block_device; | |
852c788f TH |
15 | struct io_context; |
16 | struct cgroup_subsys_state; | |
4246a0b6 | 17 | typedef void (bio_end_io_t) (struct bio *); |
7cc01581 TH |
18 | typedef void (bio_destructor_t) (struct bio *); |
19 | ||
20 | /* | |
21 | * was unsigned short, but we might as well be ready for > 64kB I/O pages | |
22 | */ | |
23 | struct bio_vec { | |
24 | struct page *bv_page; | |
25 | unsigned int bv_len; | |
26 | unsigned int bv_offset; | |
27 | }; | |
28 | ||
62a8067a AV |
29 | #ifdef CONFIG_BLOCK |
30 | ||
4f024f37 KO |
31 | struct bvec_iter { |
32 | sector_t bi_sector; /* device address in 512 byte | |
33 | sectors */ | |
34 | unsigned int bi_size; /* residual I/O count */ | |
35 | ||
36 | unsigned int bi_idx; /* current index into bvl_vec */ | |
4550dd6c KO |
37 | |
38 | unsigned int bi_bvec_done; /* number of bytes completed in | |
39 | current bvec */ | |
4f024f37 KO |
40 | }; |
41 | ||
7cc01581 TH |
42 | /* |
43 | * main unit of I/O for the block layer and lower layers (ie drivers and | |
44 | * stacking drivers) | |
45 | */ | |
46 | struct bio { | |
7cc01581 TH |
47 | struct bio *bi_next; /* request queue link */ |
48 | struct block_device *bi_bdev; | |
2c68f6dc JA |
49 | unsigned int bi_flags; /* status, command, etc */ |
50 | int bi_error; | |
7cc01581 TH |
51 | unsigned long bi_rw; /* bottom bits READ/WRITE, |
52 | * top bits priority | |
53 | */ | |
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; | |
81 | #endif | |
180b2f95 | 82 | union { |
7cc01581 | 83 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
180b2f95 | 84 | struct bio_integrity_payload *bi_integrity; /* data integrity */ |
7cc01581 | 85 | #endif |
180b2f95 | 86 | }; |
7cc01581 | 87 | |
4f024f37 KO |
88 | unsigned short bi_vcnt; /* how many bio_vec's */ |
89 | ||
f44b48c7 KO |
90 | /* |
91 | * Everything starting with bi_max_vecs will be preserved by bio_reset() | |
92 | */ | |
93 | ||
4f024f37 | 94 | unsigned short bi_max_vecs; /* max bvl_vecs we can hold */ |
f44b48c7 | 95 | |
dac56212 | 96 | atomic_t __bi_cnt; /* pin count */ |
f44b48c7 KO |
97 | |
98 | struct bio_vec *bi_io_vec; /* the actual vec list */ | |
99 | ||
395c72a7 KO |
100 | struct bio_set *bi_pool; |
101 | ||
7cc01581 TH |
102 | /* |
103 | * We can inline a number of vecs at the end of the bio, to avoid | |
104 | * double allocations for a small number of bio_vecs. This member | |
105 | * MUST obviously be kept at the very end of the bio. | |
106 | */ | |
107 | struct bio_vec bi_inline_vecs[0]; | |
108 | }; | |
109 | ||
f44b48c7 KO |
110 | #define BIO_RESET_BYTES offsetof(struct bio, bi_max_vecs) |
111 | ||
7cc01581 TH |
112 | /* |
113 | * bio flags | |
114 | */ | |
b2dbe0a6 JA |
115 | #define BIO_SEG_VALID 1 /* bi_phys_segments valid */ |
116 | #define BIO_CLONED 2 /* doesn't own data */ | |
117 | #define BIO_BOUNCED 3 /* bio is a bounce bio */ | |
118 | #define BIO_USER_MAPPED 4 /* contains user pages */ | |
119 | #define BIO_NULL_MAPPED 5 /* contains invalid user pages */ | |
120 | #define BIO_QUIET 6 /* Make BIO Quiet */ | |
a3ad0a9d JK |
121 | #define BIO_CHAIN 7 /* chained bio, ->bi_remaining in effect */ |
122 | #define BIO_REFFED 8 /* bio has elevated ->bi_cnt */ | |
f44b48c7 KO |
123 | |
124 | /* | |
125 | * Flags starting here get preserved by bio_reset() - this includes | |
126 | * BIO_POOL_IDX() | |
127 | */ | |
71368511 | 128 | #define BIO_RESET_BITS 13 |
4de13d7a | 129 | #define BIO_OWNS_VEC 13 /* bio_free() should free bvec */ |
f44b48c7 | 130 | |
7cc01581 TH |
131 | /* |
132 | * top 4 bits of bio flags indicate the pool this bio came from | |
133 | */ | |
134 | #define BIO_POOL_BITS (4) | |
135 | #define BIO_POOL_NONE ((1UL << BIO_POOL_BITS) - 1) | |
2c68f6dc | 136 | #define BIO_POOL_OFFSET (32 - BIO_POOL_BITS) |
7cc01581 TH |
137 | #define BIO_POOL_MASK (1UL << BIO_POOL_OFFSET) |
138 | #define BIO_POOL_IDX(bio) ((bio)->bi_flags >> BIO_POOL_OFFSET) | |
139 | ||
de75d60d JA |
140 | #endif /* CONFIG_BLOCK */ |
141 | ||
7cc01581 TH |
142 | /* |
143 | * Request flags. For use in the cmd_flags field of struct request, and in | |
144 | * bi_rw of struct bio. Note that some flags are only valid in either one. | |
145 | */ | |
146 | enum rq_flag_bits { | |
147 | /* common flags */ | |
148 | __REQ_WRITE, /* not set, read. set, write */ | |
149 | __REQ_FAILFAST_DEV, /* no driver retries of device errors */ | |
150 | __REQ_FAILFAST_TRANSPORT, /* no driver retries of transport errors */ | |
151 | __REQ_FAILFAST_DRIVER, /* no driver retries of driver errors */ | |
152 | ||
7cc01581 TH |
153 | __REQ_SYNC, /* request is sync (sync write or read) */ |
154 | __REQ_META, /* metadata io request */ | |
65299a3b | 155 | __REQ_PRIO, /* boost priority in cfq */ |
7cc01581 | 156 | __REQ_DISCARD, /* request to discard sectors */ |
8e4bf844 | 157 | __REQ_SECURE, /* secure discard (used with __REQ_DISCARD) */ |
4363ac7c | 158 | __REQ_WRITE_SAME, /* write same block many times */ |
8e4bf844 | 159 | |
7cc01581 | 160 | __REQ_NOIDLE, /* don't anticipate more IO after this one */ |
180b2f95 | 161 | __REQ_INTEGRITY, /* I/O includes block integrity payload */ |
8e4bf844 MW |
162 | __REQ_FUA, /* forced unit access */ |
163 | __REQ_FLUSH, /* request for cache flush */ | |
7cc01581 TH |
164 | |
165 | /* bio only flags */ | |
7cc01581 | 166 | __REQ_RAHEAD, /* read ahead, can fail anytime */ |
e43473b7 VG |
167 | __REQ_THROTTLED, /* This bio has already been subjected to |
168 | * throttling rules. Don't do it again. */ | |
7cc01581 TH |
169 | |
170 | /* request only flags */ | |
171 | __REQ_SORTED, /* elevator knows about this request */ | |
172 | __REQ_SOFTBARRIER, /* may not be passed by ioscheduler */ | |
7cc01581 TH |
173 | __REQ_NOMERGE, /* don't touch this for merging */ |
174 | __REQ_STARTED, /* drive already may have started this one */ | |
175 | __REQ_DONTPREP, /* don't call prep for this one */ | |
176 | __REQ_QUEUED, /* uses queueing */ | |
177 | __REQ_ELVPRIV, /* elevator private data attached */ | |
178 | __REQ_FAILED, /* set if the request failed */ | |
179 | __REQ_QUIET, /* don't worry about errors */ | |
bba0bdd7 BVA |
180 | __REQ_PREEMPT, /* set for "ide_preempt" requests and also |
181 | for requests for which the SCSI "quiesce" | |
182 | state must be ignored. */ | |
7cc01581 TH |
183 | __REQ_ALLOCED, /* request came from our alloc pool */ |
184 | __REQ_COPY_USER, /* contains copies of user pages */ | |
414b4ff5 | 185 | __REQ_FLUSH_SEQ, /* request for flush sequence */ |
7cc01581 TH |
186 | __REQ_IO_STAT, /* account I/O stat */ |
187 | __REQ_MIXED_MERGE, /* merge of different types, fail separately */ | |
66311274 | 188 | __REQ_PM, /* runtime pm request */ |
360f92c2 | 189 | __REQ_HASHED, /* on IO scheduler merge hash */ |
0d2602ca | 190 | __REQ_MQ_INFLIGHT, /* track inflight for MQ */ |
5b3f25fc | 191 | __REQ_NO_TIMEOUT, /* requests may never expire */ |
7cc01581 TH |
192 | __REQ_NR_BITS, /* stops here */ |
193 | }; | |
194 | ||
5953316d JA |
195 | #define REQ_WRITE (1ULL << __REQ_WRITE) |
196 | #define REQ_FAILFAST_DEV (1ULL << __REQ_FAILFAST_DEV) | |
197 | #define REQ_FAILFAST_TRANSPORT (1ULL << __REQ_FAILFAST_TRANSPORT) | |
198 | #define REQ_FAILFAST_DRIVER (1ULL << __REQ_FAILFAST_DRIVER) | |
199 | #define REQ_SYNC (1ULL << __REQ_SYNC) | |
200 | #define REQ_META (1ULL << __REQ_META) | |
201 | #define REQ_PRIO (1ULL << __REQ_PRIO) | |
202 | #define REQ_DISCARD (1ULL << __REQ_DISCARD) | |
203 | #define REQ_WRITE_SAME (1ULL << __REQ_WRITE_SAME) | |
204 | #define REQ_NOIDLE (1ULL << __REQ_NOIDLE) | |
180b2f95 | 205 | #define REQ_INTEGRITY (1ULL << __REQ_INTEGRITY) |
7cc01581 TH |
206 | |
207 | #define REQ_FAILFAST_MASK \ | |
208 | (REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT | REQ_FAILFAST_DRIVER) | |
209 | #define REQ_COMMON_MASK \ | |
65299a3b | 210 | (REQ_WRITE | REQ_FAILFAST_MASK | REQ_SYNC | REQ_META | REQ_PRIO | \ |
4363ac7c | 211 | REQ_DISCARD | REQ_WRITE_SAME | REQ_NOIDLE | REQ_FLUSH | REQ_FUA | \ |
180b2f95 | 212 | REQ_SECURE | REQ_INTEGRITY) |
3a2edd0d | 213 | #define REQ_CLONE_MASK REQ_COMMON_MASK |
7cc01581 | 214 | |
054bdf64 KO |
215 | #define BIO_NO_ADVANCE_ITER_MASK (REQ_DISCARD|REQ_WRITE_SAME) |
216 | ||
e2a60da7 MP |
217 | /* This mask is used for both bio and request merge checking */ |
218 | #define REQ_NOMERGE_FLAGS \ | |
b2387ddc | 219 | (REQ_NOMERGE | REQ_STARTED | REQ_SOFTBARRIER | REQ_FLUSH | REQ_FUA | REQ_FLUSH_SEQ) |
e2a60da7 | 220 | |
5953316d JA |
221 | #define REQ_RAHEAD (1ULL << __REQ_RAHEAD) |
222 | #define REQ_THROTTLED (1ULL << __REQ_THROTTLED) | |
223 | ||
224 | #define REQ_SORTED (1ULL << __REQ_SORTED) | |
225 | #define REQ_SOFTBARRIER (1ULL << __REQ_SOFTBARRIER) | |
226 | #define REQ_FUA (1ULL << __REQ_FUA) | |
227 | #define REQ_NOMERGE (1ULL << __REQ_NOMERGE) | |
228 | #define REQ_STARTED (1ULL << __REQ_STARTED) | |
229 | #define REQ_DONTPREP (1ULL << __REQ_DONTPREP) | |
230 | #define REQ_QUEUED (1ULL << __REQ_QUEUED) | |
231 | #define REQ_ELVPRIV (1ULL << __REQ_ELVPRIV) | |
232 | #define REQ_FAILED (1ULL << __REQ_FAILED) | |
233 | #define REQ_QUIET (1ULL << __REQ_QUIET) | |
234 | #define REQ_PREEMPT (1ULL << __REQ_PREEMPT) | |
235 | #define REQ_ALLOCED (1ULL << __REQ_ALLOCED) | |
236 | #define REQ_COPY_USER (1ULL << __REQ_COPY_USER) | |
237 | #define REQ_FLUSH (1ULL << __REQ_FLUSH) | |
238 | #define REQ_FLUSH_SEQ (1ULL << __REQ_FLUSH_SEQ) | |
239 | #define REQ_IO_STAT (1ULL << __REQ_IO_STAT) | |
240 | #define REQ_MIXED_MERGE (1ULL << __REQ_MIXED_MERGE) | |
241 | #define REQ_SECURE (1ULL << __REQ_SECURE) | |
5953316d | 242 | #define REQ_PM (1ULL << __REQ_PM) |
360f92c2 | 243 | #define REQ_HASHED (1ULL << __REQ_HASHED) |
0d2602ca | 244 | #define REQ_MQ_INFLIGHT (1ULL << __REQ_MQ_INFLIGHT) |
5b3f25fc | 245 | #define REQ_NO_TIMEOUT (1ULL << __REQ_NO_TIMEOUT) |
7cc01581 | 246 | |
dece1635 JA |
247 | typedef unsigned int blk_qc_t; |
248 | #define BLK_QC_T_NONE -1U | |
249 | #define BLK_QC_T_SHIFT 16 | |
250 | ||
251 | static inline bool blk_qc_t_valid(blk_qc_t cookie) | |
252 | { | |
253 | return cookie != BLK_QC_T_NONE; | |
254 | } | |
255 | ||
256 | static inline blk_qc_t blk_tag_to_qc_t(unsigned int tag, unsigned int queue_num) | |
257 | { | |
258 | return tag | (queue_num << BLK_QC_T_SHIFT); | |
259 | } | |
260 | ||
261 | static inline unsigned int blk_qc_t_to_queue_num(blk_qc_t cookie) | |
262 | { | |
263 | return cookie >> BLK_QC_T_SHIFT; | |
264 | } | |
265 | ||
266 | static inline unsigned int blk_qc_t_to_tag(blk_qc_t cookie) | |
267 | { | |
268 | return cookie & 0xffff; | |
269 | } | |
270 | ||
7cc01581 | 271 | #endif /* __LINUX_BLK_TYPES_H */ |