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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 | ||
31 | /* | |
32 | * main unit of I/O for the block layer and lower layers (ie drivers and | |
33 | * stacking drivers) | |
34 | */ | |
35 | struct bio { | |
36 | sector_t bi_sector; /* device address in 512 byte | |
37 | sectors */ | |
38 | struct bio *bi_next; /* request queue link */ | |
39 | struct block_device *bi_bdev; | |
40 | unsigned long bi_flags; /* status, command, etc */ | |
41 | unsigned long bi_rw; /* bottom bits READ/WRITE, | |
42 | * top bits priority | |
43 | */ | |
44 | ||
45 | unsigned short bi_vcnt; /* how many bio_vec's */ | |
46 | unsigned short bi_idx; /* current index into bvl_vec */ | |
47 | ||
48 | /* Number of segments in this BIO after | |
49 | * physical address coalescing is performed. | |
50 | */ | |
51 | unsigned int bi_phys_segments; | |
52 | ||
53 | unsigned int bi_size; /* residual I/O count */ | |
54 | ||
55 | /* | |
56 | * To keep track of the max segment size, we account for the | |
57 | * sizes of the first and last mergeable segments in this bio. | |
58 | */ | |
59 | unsigned int bi_seg_front_size; | |
60 | unsigned int bi_seg_back_size; | |
61 | ||
7cc01581 TH |
62 | bio_end_io_t *bi_end_io; |
63 | ||
64 | void *bi_private; | |
852c788f TH |
65 | #ifdef CONFIG_BLK_CGROUP |
66 | /* | |
67 | * Optional ioc and css associated with this bio. Put on bio | |
68 | * release. Read comment on top of bio_associate_current(). | |
69 | */ | |
70 | struct io_context *bi_ioc; | |
71 | struct cgroup_subsys_state *bi_css; | |
72 | #endif | |
7cc01581 TH |
73 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
74 | struct bio_integrity_payload *bi_integrity; /* data integrity */ | |
75 | #endif | |
76 | ||
f44b48c7 KO |
77 | /* |
78 | * Everything starting with bi_max_vecs will be preserved by bio_reset() | |
79 | */ | |
80 | ||
81 | unsigned int bi_max_vecs; /* max bvl_vecs we can hold */ | |
82 | ||
83 | atomic_t bi_cnt; /* pin count */ | |
84 | ||
85 | struct bio_vec *bi_io_vec; /* the actual vec list */ | |
86 | ||
395c72a7 KO |
87 | struct bio_set *bi_pool; |
88 | ||
7cc01581 TH |
89 | /* |
90 | * We can inline a number of vecs at the end of the bio, to avoid | |
91 | * double allocations for a small number of bio_vecs. This member | |
92 | * MUST obviously be kept at the very end of the bio. | |
93 | */ | |
94 | struct bio_vec bi_inline_vecs[0]; | |
95 | }; | |
96 | ||
f44b48c7 KO |
97 | #define BIO_RESET_BYTES offsetof(struct bio, bi_max_vecs) |
98 | ||
7cc01581 TH |
99 | /* |
100 | * bio flags | |
101 | */ | |
102 | #define BIO_UPTODATE 0 /* ok after I/O completion */ | |
103 | #define BIO_RW_BLOCK 1 /* RW_AHEAD set, and read/write would block */ | |
104 | #define BIO_EOF 2 /* out-out-bounds error */ | |
105 | #define BIO_SEG_VALID 3 /* bi_phys_segments valid */ | |
106 | #define BIO_CLONED 4 /* doesn't own data */ | |
107 | #define BIO_BOUNCED 5 /* bio is a bounce bio */ | |
108 | #define BIO_USER_MAPPED 6 /* contains user pages */ | |
109 | #define BIO_EOPNOTSUPP 7 /* not supported */ | |
9562ad9a TM |
110 | #define BIO_NULL_MAPPED 8 /* contains invalid user pages */ |
111 | #define BIO_FS_INTEGRITY 9 /* fs owns integrity data, not block layer */ | |
112 | #define BIO_QUIET 10 /* Make BIO Quiet */ | |
113 | #define BIO_MAPPED_INTEGRITY 11/* integrity metadata has been remapped */ | |
f44b48c7 KO |
114 | |
115 | /* | |
116 | * Flags starting here get preserved by bio_reset() - this includes | |
117 | * BIO_POOL_IDX() | |
118 | */ | |
119 | #define BIO_RESET_BITS 12 | |
120 | ||
7cc01581 TH |
121 | #define bio_flagged(bio, flag) ((bio)->bi_flags & (1 << (flag))) |
122 | ||
123 | /* | |
124 | * top 4 bits of bio flags indicate the pool this bio came from | |
125 | */ | |
126 | #define BIO_POOL_BITS (4) | |
127 | #define BIO_POOL_NONE ((1UL << BIO_POOL_BITS) - 1) | |
128 | #define BIO_POOL_OFFSET (BITS_PER_LONG - BIO_POOL_BITS) | |
129 | #define BIO_POOL_MASK (1UL << BIO_POOL_OFFSET) | |
130 | #define BIO_POOL_IDX(bio) ((bio)->bi_flags >> BIO_POOL_OFFSET) | |
131 | ||
de75d60d JA |
132 | #endif /* CONFIG_BLOCK */ |
133 | ||
7cc01581 TH |
134 | /* |
135 | * Request flags. For use in the cmd_flags field of struct request, and in | |
136 | * bi_rw of struct bio. Note that some flags are only valid in either one. | |
137 | */ | |
138 | enum rq_flag_bits { | |
139 | /* common flags */ | |
140 | __REQ_WRITE, /* not set, read. set, write */ | |
141 | __REQ_FAILFAST_DEV, /* no driver retries of device errors */ | |
142 | __REQ_FAILFAST_TRANSPORT, /* no driver retries of transport errors */ | |
143 | __REQ_FAILFAST_DRIVER, /* no driver retries of driver errors */ | |
144 | ||
7cc01581 TH |
145 | __REQ_SYNC, /* request is sync (sync write or read) */ |
146 | __REQ_META, /* metadata io request */ | |
65299a3b | 147 | __REQ_PRIO, /* boost priority in cfq */ |
7cc01581 | 148 | __REQ_DISCARD, /* request to discard sectors */ |
8e4bf844 MW |
149 | __REQ_SECURE, /* secure discard (used with __REQ_DISCARD) */ |
150 | ||
7cc01581 | 151 | __REQ_NOIDLE, /* don't anticipate more IO after this one */ |
8e4bf844 MW |
152 | __REQ_FUA, /* forced unit access */ |
153 | __REQ_FLUSH, /* request for cache flush */ | |
7cc01581 TH |
154 | |
155 | /* bio only flags */ | |
7cc01581 | 156 | __REQ_RAHEAD, /* read ahead, can fail anytime */ |
e43473b7 VG |
157 | __REQ_THROTTLED, /* This bio has already been subjected to |
158 | * throttling rules. Don't do it again. */ | |
7cc01581 TH |
159 | |
160 | /* request only flags */ | |
161 | __REQ_SORTED, /* elevator knows about this request */ | |
162 | __REQ_SOFTBARRIER, /* may not be passed by ioscheduler */ | |
7cc01581 TH |
163 | __REQ_NOMERGE, /* don't touch this for merging */ |
164 | __REQ_STARTED, /* drive already may have started this one */ | |
165 | __REQ_DONTPREP, /* don't call prep for this one */ | |
166 | __REQ_QUEUED, /* uses queueing */ | |
167 | __REQ_ELVPRIV, /* elevator private data attached */ | |
168 | __REQ_FAILED, /* set if the request failed */ | |
169 | __REQ_QUIET, /* don't worry about errors */ | |
170 | __REQ_PREEMPT, /* set for "ide_preempt" requests */ | |
7cc01581 TH |
171 | __REQ_ALLOCED, /* request came from our alloc pool */ |
172 | __REQ_COPY_USER, /* contains copies of user pages */ | |
414b4ff5 | 173 | __REQ_FLUSH_SEQ, /* request for flush sequence */ |
7cc01581 TH |
174 | __REQ_IO_STAT, /* account I/O stat */ |
175 | __REQ_MIXED_MERGE, /* merge of different types, fail separately */ | |
18022c5d | 176 | __REQ_KERNEL, /* direct IO to kernel pages */ |
7cc01581 TH |
177 | __REQ_NR_BITS, /* stops here */ |
178 | }; | |
179 | ||
180 | #define REQ_WRITE (1 << __REQ_WRITE) | |
181 | #define REQ_FAILFAST_DEV (1 << __REQ_FAILFAST_DEV) | |
182 | #define REQ_FAILFAST_TRANSPORT (1 << __REQ_FAILFAST_TRANSPORT) | |
183 | #define REQ_FAILFAST_DRIVER (1 << __REQ_FAILFAST_DRIVER) | |
7cc01581 TH |
184 | #define REQ_SYNC (1 << __REQ_SYNC) |
185 | #define REQ_META (1 << __REQ_META) | |
65299a3b | 186 | #define REQ_PRIO (1 << __REQ_PRIO) |
7cc01581 TH |
187 | #define REQ_DISCARD (1 << __REQ_DISCARD) |
188 | #define REQ_NOIDLE (1 << __REQ_NOIDLE) | |
189 | ||
190 | #define REQ_FAILFAST_MASK \ | |
191 | (REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT | REQ_FAILFAST_DRIVER) | |
192 | #define REQ_COMMON_MASK \ | |
65299a3b CH |
193 | (REQ_WRITE | REQ_FAILFAST_MASK | REQ_SYNC | REQ_META | REQ_PRIO | \ |
194 | REQ_DISCARD | REQ_NOIDLE | REQ_FLUSH | REQ_FUA | REQ_SECURE) | |
3a2edd0d | 195 | #define REQ_CLONE_MASK REQ_COMMON_MASK |
7cc01581 | 196 | |
7cc01581 | 197 | #define REQ_RAHEAD (1 << __REQ_RAHEAD) |
e43473b7 | 198 | #define REQ_THROTTLED (1 << __REQ_THROTTLED) |
7cc01581 TH |
199 | |
200 | #define REQ_SORTED (1 << __REQ_SORTED) | |
201 | #define REQ_SOFTBARRIER (1 << __REQ_SOFTBARRIER) | |
202 | #define REQ_FUA (1 << __REQ_FUA) | |
203 | #define REQ_NOMERGE (1 << __REQ_NOMERGE) | |
204 | #define REQ_STARTED (1 << __REQ_STARTED) | |
205 | #define REQ_DONTPREP (1 << __REQ_DONTPREP) | |
206 | #define REQ_QUEUED (1 << __REQ_QUEUED) | |
207 | #define REQ_ELVPRIV (1 << __REQ_ELVPRIV) | |
208 | #define REQ_FAILED (1 << __REQ_FAILED) | |
209 | #define REQ_QUIET (1 << __REQ_QUIET) | |
210 | #define REQ_PREEMPT (1 << __REQ_PREEMPT) | |
7cc01581 TH |
211 | #define REQ_ALLOCED (1 << __REQ_ALLOCED) |
212 | #define REQ_COPY_USER (1 << __REQ_COPY_USER) | |
7cc01581 | 213 | #define REQ_FLUSH (1 << __REQ_FLUSH) |
414b4ff5 | 214 | #define REQ_FLUSH_SEQ (1 << __REQ_FLUSH_SEQ) |
7cc01581 TH |
215 | #define REQ_IO_STAT (1 << __REQ_IO_STAT) |
216 | #define REQ_MIXED_MERGE (1 << __REQ_MIXED_MERGE) | |
8d57a98c | 217 | #define REQ_SECURE (1 << __REQ_SECURE) |
18022c5d | 218 | #define REQ_KERNEL (1 << __REQ_KERNEL) |
7cc01581 | 219 | |
7cc01581 | 220 | #endif /* __LINUX_BLK_TYPES_H */ |