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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 | ||
8 | #ifdef CONFIG_BLOCK | |
9 | ||
10 | #include <linux/types.h> | |
11 | ||
12 | struct bio_set; | |
13 | struct bio; | |
14 | struct bio_integrity_payload; | |
15 | struct page; | |
16 | struct block_device; | |
852c788f TH |
17 | struct io_context; |
18 | struct cgroup_subsys_state; | |
7cc01581 TH |
19 | typedef void (bio_end_io_t) (struct bio *, int); |
20 | typedef void (bio_destructor_t) (struct bio *); | |
21 | ||
22 | /* | |
23 | * was unsigned short, but we might as well be ready for > 64kB I/O pages | |
24 | */ | |
25 | struct bio_vec { | |
26 | struct page *bv_page; | |
27 | unsigned int bv_len; | |
28 | unsigned int bv_offset; | |
29 | }; | |
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; | |
49 | unsigned long bi_flags; /* status, command, etc */ | |
50 | unsigned long bi_rw; /* bottom bits READ/WRITE, | |
51 | * top bits priority | |
52 | */ | |
53 | ||
4f024f37 | 54 | struct bvec_iter bi_iter; |
7cc01581 TH |
55 | |
56 | /* Number of segments in this BIO after | |
57 | * physical address coalescing is performed. | |
58 | */ | |
59 | unsigned int bi_phys_segments; | |
60 | ||
7cc01581 TH |
61 | /* |
62 | * To keep track of the max segment size, we account for the | |
63 | * sizes of the first and last mergeable segments in this bio. | |
64 | */ | |
65 | unsigned int bi_seg_front_size; | |
66 | unsigned int bi_seg_back_size; | |
67 | ||
196d38bc KO |
68 | atomic_t bi_remaining; |
69 | ||
7cc01581 TH |
70 | bio_end_io_t *bi_end_io; |
71 | ||
72 | void *bi_private; | |
852c788f TH |
73 | #ifdef CONFIG_BLK_CGROUP |
74 | /* | |
75 | * Optional ioc and css associated with this bio. Put on bio | |
76 | * release. Read comment on top of bio_associate_current(). | |
77 | */ | |
78 | struct io_context *bi_ioc; | |
79 | struct cgroup_subsys_state *bi_css; | |
80 | #endif | |
7cc01581 TH |
81 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
82 | struct bio_integrity_payload *bi_integrity; /* data integrity */ | |
83 | #endif | |
84 | ||
4f024f37 KO |
85 | unsigned short bi_vcnt; /* how many bio_vec's */ |
86 | ||
f44b48c7 KO |
87 | /* |
88 | * Everything starting with bi_max_vecs will be preserved by bio_reset() | |
89 | */ | |
90 | ||
4f024f37 | 91 | unsigned short bi_max_vecs; /* max bvl_vecs we can hold */ |
f44b48c7 KO |
92 | |
93 | atomic_t bi_cnt; /* pin count */ | |
94 | ||
95 | struct bio_vec *bi_io_vec; /* the actual vec list */ | |
96 | ||
395c72a7 KO |
97 | struct bio_set *bi_pool; |
98 | ||
7cc01581 TH |
99 | /* |
100 | * We can inline a number of vecs at the end of the bio, to avoid | |
101 | * double allocations for a small number of bio_vecs. This member | |
102 | * MUST obviously be kept at the very end of the bio. | |
103 | */ | |
104 | struct bio_vec bi_inline_vecs[0]; | |
105 | }; | |
106 | ||
f44b48c7 KO |
107 | #define BIO_RESET_BYTES offsetof(struct bio, bi_max_vecs) |
108 | ||
7cc01581 TH |
109 | /* |
110 | * bio flags | |
111 | */ | |
112 | #define BIO_UPTODATE 0 /* ok after I/O completion */ | |
113 | #define BIO_RW_BLOCK 1 /* RW_AHEAD set, and read/write would block */ | |
114 | #define BIO_EOF 2 /* out-out-bounds error */ | |
115 | #define BIO_SEG_VALID 3 /* bi_phys_segments valid */ | |
116 | #define BIO_CLONED 4 /* doesn't own data */ | |
117 | #define BIO_BOUNCED 5 /* bio is a bounce bio */ | |
118 | #define BIO_USER_MAPPED 6 /* contains user pages */ | |
119 | #define BIO_EOPNOTSUPP 7 /* not supported */ | |
9562ad9a TM |
120 | #define BIO_NULL_MAPPED 8 /* contains invalid user pages */ |
121 | #define BIO_FS_INTEGRITY 9 /* fs owns integrity data, not block layer */ | |
122 | #define BIO_QUIET 10 /* Make BIO Quiet */ | |
123 | #define BIO_MAPPED_INTEGRITY 11/* integrity metadata has been remapped */ | |
71368511 | 124 | #define BIO_SNAP_STABLE 12 /* bio data must be snapshotted during write */ |
f44b48c7 KO |
125 | |
126 | /* | |
127 | * Flags starting here get preserved by bio_reset() - this includes | |
128 | * BIO_POOL_IDX() | |
129 | */ | |
71368511 | 130 | #define BIO_RESET_BITS 13 |
4de13d7a | 131 | #define BIO_OWNS_VEC 13 /* bio_free() should free bvec */ |
f44b48c7 | 132 | |
7cc01581 TH |
133 | #define bio_flagged(bio, flag) ((bio)->bi_flags & (1 << (flag))) |
134 | ||
135 | /* | |
136 | * top 4 bits of bio flags indicate the pool this bio came from | |
137 | */ | |
138 | #define BIO_POOL_BITS (4) | |
139 | #define BIO_POOL_NONE ((1UL << BIO_POOL_BITS) - 1) | |
140 | #define BIO_POOL_OFFSET (BITS_PER_LONG - BIO_POOL_BITS) | |
141 | #define BIO_POOL_MASK (1UL << BIO_POOL_OFFSET) | |
142 | #define BIO_POOL_IDX(bio) ((bio)->bi_flags >> BIO_POOL_OFFSET) | |
143 | ||
de75d60d JA |
144 | #endif /* CONFIG_BLOCK */ |
145 | ||
7cc01581 TH |
146 | /* |
147 | * Request flags. For use in the cmd_flags field of struct request, and in | |
148 | * bi_rw of struct bio. Note that some flags are only valid in either one. | |
149 | */ | |
150 | enum rq_flag_bits { | |
151 | /* common flags */ | |
152 | __REQ_WRITE, /* not set, read. set, write */ | |
153 | __REQ_FAILFAST_DEV, /* no driver retries of device errors */ | |
154 | __REQ_FAILFAST_TRANSPORT, /* no driver retries of transport errors */ | |
155 | __REQ_FAILFAST_DRIVER, /* no driver retries of driver errors */ | |
156 | ||
7cc01581 TH |
157 | __REQ_SYNC, /* request is sync (sync write or read) */ |
158 | __REQ_META, /* metadata io request */ | |
65299a3b | 159 | __REQ_PRIO, /* boost priority in cfq */ |
7cc01581 | 160 | __REQ_DISCARD, /* request to discard sectors */ |
8e4bf844 | 161 | __REQ_SECURE, /* secure discard (used with __REQ_DISCARD) */ |
4363ac7c | 162 | __REQ_WRITE_SAME, /* write same block many times */ |
8e4bf844 | 163 | |
7cc01581 | 164 | __REQ_NOIDLE, /* don't anticipate more IO after this one */ |
8e4bf844 MW |
165 | __REQ_FUA, /* forced unit access */ |
166 | __REQ_FLUSH, /* request for cache flush */ | |
7cc01581 TH |
167 | |
168 | /* bio only flags */ | |
7cc01581 | 169 | __REQ_RAHEAD, /* read ahead, can fail anytime */ |
e43473b7 VG |
170 | __REQ_THROTTLED, /* This bio has already been subjected to |
171 | * throttling rules. Don't do it again. */ | |
7cc01581 TH |
172 | |
173 | /* request only flags */ | |
174 | __REQ_SORTED, /* elevator knows about this request */ | |
175 | __REQ_SOFTBARRIER, /* may not be passed by ioscheduler */ | |
7cc01581 TH |
176 | __REQ_NOMERGE, /* don't touch this for merging */ |
177 | __REQ_STARTED, /* drive already may have started this one */ | |
178 | __REQ_DONTPREP, /* don't call prep for this one */ | |
179 | __REQ_QUEUED, /* uses queueing */ | |
180 | __REQ_ELVPRIV, /* elevator private data attached */ | |
181 | __REQ_FAILED, /* set if the request failed */ | |
182 | __REQ_QUIET, /* don't worry about errors */ | |
183 | __REQ_PREEMPT, /* set for "ide_preempt" requests */ | |
7cc01581 TH |
184 | __REQ_ALLOCED, /* request came from our alloc pool */ |
185 | __REQ_COPY_USER, /* contains copies of user pages */ | |
414b4ff5 | 186 | __REQ_FLUSH_SEQ, /* request for flush sequence */ |
7cc01581 TH |
187 | __REQ_IO_STAT, /* account I/O stat */ |
188 | __REQ_MIXED_MERGE, /* merge of different types, fail separately */ | |
18022c5d | 189 | __REQ_KERNEL, /* direct IO to kernel pages */ |
66311274 | 190 | __REQ_PM, /* runtime pm request */ |
320ae51f | 191 | __REQ_END, /* last of chain of requests */ |
360f92c2 | 192 | __REQ_HASHED, /* on IO scheduler merge hash */ |
7cc01581 TH |
193 | __REQ_NR_BITS, /* stops here */ |
194 | }; | |
195 | ||
5953316d JA |
196 | #define REQ_WRITE (1ULL << __REQ_WRITE) |
197 | #define REQ_FAILFAST_DEV (1ULL << __REQ_FAILFAST_DEV) | |
198 | #define REQ_FAILFAST_TRANSPORT (1ULL << __REQ_FAILFAST_TRANSPORT) | |
199 | #define REQ_FAILFAST_DRIVER (1ULL << __REQ_FAILFAST_DRIVER) | |
200 | #define REQ_SYNC (1ULL << __REQ_SYNC) | |
201 | #define REQ_META (1ULL << __REQ_META) | |
202 | #define REQ_PRIO (1ULL << __REQ_PRIO) | |
203 | #define REQ_DISCARD (1ULL << __REQ_DISCARD) | |
204 | #define REQ_WRITE_SAME (1ULL << __REQ_WRITE_SAME) | |
205 | #define REQ_NOIDLE (1ULL << __REQ_NOIDLE) | |
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 MP |
211 | REQ_DISCARD | REQ_WRITE_SAME | REQ_NOIDLE | REQ_FLUSH | REQ_FUA | \ |
212 | REQ_SECURE) | |
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 \ | |
219 | (REQ_NOMERGE | REQ_STARTED | REQ_SOFTBARRIER | REQ_FLUSH | REQ_FUA) | |
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) | |
242 | #define REQ_KERNEL (1ULL << __REQ_KERNEL) | |
243 | #define REQ_PM (1ULL << __REQ_PM) | |
320ae51f | 244 | #define REQ_END (1ULL << __REQ_END) |
360f92c2 | 245 | #define REQ_HASHED (1ULL << __REQ_HASHED) |
7cc01581 | 246 | |
7cc01581 | 247 | #endif /* __LINUX_BLK_TYPES_H */ |