1
2
3
4
5
6#ifndef __LINUX_BLK_TYPES_H
7#define __LINUX_BLK_TYPES_H
8
9#include <linux/types.h>
10#include <linux/bvec.h>
11
12struct bio_set;
13struct bio;
14struct bio_integrity_payload;
15struct page;
16struct block_device;
17struct io_context;
18struct cgroup_subsys_state;
19typedef void (bio_end_io_t) (struct bio *);
20
21
22
23
24typedef u8 __bitwise blk_status_t;
25#define BLK_STS_OK 0
26#define BLK_STS_NOTSUPP ((__force blk_status_t)1)
27#define BLK_STS_TIMEOUT ((__force blk_status_t)2)
28#define BLK_STS_NOSPC ((__force blk_status_t)3)
29#define BLK_STS_TRANSPORT ((__force blk_status_t)4)
30#define BLK_STS_TARGET ((__force blk_status_t)5)
31#define BLK_STS_NEXUS ((__force blk_status_t)6)
32#define BLK_STS_MEDIUM ((__force blk_status_t)7)
33#define BLK_STS_PROTECTION ((__force blk_status_t)8)
34#define BLK_STS_RESOURCE ((__force blk_status_t)9)
35#define BLK_STS_IOERR ((__force blk_status_t)10)
36
37
38#define BLK_STS_DM_REQUEUE ((__force blk_status_t)11)
39
40#define BLK_STS_AGAIN ((__force blk_status_t)12)
41
42struct blk_issue_stat {
43 u64 stat;
44};
45
46
47
48
49
50struct bio {
51 struct bio *bi_next;
52 struct gendisk *bi_disk;
53 unsigned int bi_opf;
54
55
56
57 unsigned short bi_flags;
58 unsigned short bi_ioprio;
59 unsigned short bi_write_hint;
60 blk_status_t bi_status;
61 u8 bi_partno;
62
63
64
65
66 unsigned int bi_phys_segments;
67
68
69
70
71
72 unsigned int bi_seg_front_size;
73 unsigned int bi_seg_back_size;
74
75 struct bvec_iter bi_iter;
76
77 atomic_t __bi_remaining;
78 bio_end_io_t *bi_end_io;
79
80 void *bi_private;
81#ifdef CONFIG_BLK_CGROUP
82
83
84
85
86 struct io_context *bi_ioc;
87 struct cgroup_subsys_state *bi_css;
88#ifdef CONFIG_BLK_DEV_THROTTLING_LOW
89 void *bi_cg_private;
90 struct blk_issue_stat bi_issue_stat;
91#endif
92#endif
93 union {
94#if defined(CONFIG_BLK_DEV_INTEGRITY)
95 struct bio_integrity_payload *bi_integrity;
96#endif
97 };
98
99 unsigned short bi_vcnt;
100
101
102
103
104
105 unsigned short bi_max_vecs;
106
107 atomic_t __bi_cnt;
108
109 struct bio_vec *bi_io_vec;
110
111 struct bio_set *bi_pool;
112
113
114
115
116
117
118 struct bio_vec bi_inline_vecs[0];
119};
120
121#define BIO_RESET_BYTES offsetof(struct bio, bi_max_vecs)
122
123
124
125
126#define BIO_SEG_VALID 1
127#define BIO_CLONED 2
128#define BIO_BOUNCED 3
129#define BIO_USER_MAPPED 4
130#define BIO_NULL_MAPPED 5
131#define BIO_QUIET 6
132#define BIO_CHAIN 7
133#define BIO_REFFED 8
134#define BIO_THROTTLED 9
135
136#define BIO_TRACE_COMPLETION 10
137
138
139
140
141
142
143
144#define BVEC_POOL_NR 6
145#define BVEC_POOL_MAX (BVEC_POOL_NR - 1)
146
147
148
149
150
151
152#define BVEC_POOL_BITS (3)
153#define BVEC_POOL_OFFSET (16 - BVEC_POOL_BITS)
154#define BVEC_POOL_IDX(bio) ((bio)->bi_flags >> BVEC_POOL_OFFSET)
155#if (1<< BVEC_POOL_BITS) < (BVEC_POOL_NR+1)
156# error "BVEC_POOL_BITS is too small"
157#endif
158
159
160
161
162
163#define BIO_RESET_BITS BVEC_POOL_OFFSET
164
165typedef __u32 __bitwise blk_mq_req_flags_t;
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180#define REQ_OP_BITS 8
181#define REQ_OP_MASK ((1 << REQ_OP_BITS) - 1)
182#define REQ_FLAG_BITS 24
183
184enum req_opf {
185
186 REQ_OP_READ = 0,
187
188 REQ_OP_WRITE = 1,
189
190 REQ_OP_FLUSH = 2,
191
192 REQ_OP_DISCARD = 3,
193
194 REQ_OP_ZONE_REPORT = 4,
195
196 REQ_OP_SECURE_ERASE = 5,
197
198 REQ_OP_ZONE_RESET = 6,
199
200 REQ_OP_WRITE_SAME = 7,
201
202 REQ_OP_WRITE_ZEROES = 9,
203
204
205 REQ_OP_SCSI_IN = 32,
206 REQ_OP_SCSI_OUT = 33,
207
208 REQ_OP_DRV_IN = 34,
209 REQ_OP_DRV_OUT = 35,
210
211 REQ_OP_LAST,
212};
213
214enum req_flag_bits {
215 __REQ_FAILFAST_DEV =
216 REQ_OP_BITS,
217 __REQ_FAILFAST_TRANSPORT,
218 __REQ_FAILFAST_DRIVER,
219 __REQ_SYNC,
220 __REQ_META,
221 __REQ_PRIO,
222 __REQ_NOMERGE,
223 __REQ_IDLE,
224 __REQ_INTEGRITY,
225 __REQ_FUA,
226 __REQ_PREFLUSH,
227 __REQ_RAHEAD,
228 __REQ_BACKGROUND,
229 __REQ_NOWAIT,
230
231
232 __REQ_NOUNMAP,
233
234
235 __REQ_DRV,
236
237 __REQ_NR_BITS,
238};
239
240#define REQ_FAILFAST_DEV (1ULL << __REQ_FAILFAST_DEV)
241#define REQ_FAILFAST_TRANSPORT (1ULL << __REQ_FAILFAST_TRANSPORT)
242#define REQ_FAILFAST_DRIVER (1ULL << __REQ_FAILFAST_DRIVER)
243#define REQ_SYNC (1ULL << __REQ_SYNC)
244#define REQ_META (1ULL << __REQ_META)
245#define REQ_PRIO (1ULL << __REQ_PRIO)
246#define REQ_NOMERGE (1ULL << __REQ_NOMERGE)
247#define REQ_IDLE (1ULL << __REQ_IDLE)
248#define REQ_INTEGRITY (1ULL << __REQ_INTEGRITY)
249#define REQ_FUA (1ULL << __REQ_FUA)
250#define REQ_PREFLUSH (1ULL << __REQ_PREFLUSH)
251#define REQ_RAHEAD (1ULL << __REQ_RAHEAD)
252#define REQ_BACKGROUND (1ULL << __REQ_BACKGROUND)
253#define REQ_NOWAIT (1ULL << __REQ_NOWAIT)
254
255#define REQ_NOUNMAP (1ULL << __REQ_NOUNMAP)
256
257#define REQ_DRV (1ULL << __REQ_DRV)
258
259#define REQ_FAILFAST_MASK \
260 (REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT | REQ_FAILFAST_DRIVER)
261
262#define REQ_NOMERGE_FLAGS \
263 (REQ_NOMERGE | REQ_PREFLUSH | REQ_FUA)
264
265#define bio_op(bio) \
266 ((bio)->bi_opf & REQ_OP_MASK)
267#define req_op(req) \
268 ((req)->cmd_flags & REQ_OP_MASK)
269
270
271static inline void bio_set_op_attrs(struct bio *bio, unsigned op,
272 unsigned op_flags)
273{
274 bio->bi_opf = op | op_flags;
275}
276
277static inline bool op_is_write(unsigned int op)
278{
279 return (op & 1);
280}
281
282
283
284
285
286static inline bool op_is_flush(unsigned int op)
287{
288 return op & (REQ_FUA | REQ_PREFLUSH);
289}
290
291
292
293
294
295
296static inline bool op_is_sync(unsigned int op)
297{
298 return (op & REQ_OP_MASK) == REQ_OP_READ ||
299 (op & (REQ_SYNC | REQ_FUA | REQ_PREFLUSH));
300}
301
302typedef unsigned int blk_qc_t;
303#define BLK_QC_T_NONE -1U
304#define BLK_QC_T_SHIFT 16
305#define BLK_QC_T_INTERNAL (1U << 31)
306
307static inline bool blk_qc_t_valid(blk_qc_t cookie)
308{
309 return cookie != BLK_QC_T_NONE;
310}
311
312static inline blk_qc_t blk_tag_to_qc_t(unsigned int tag, unsigned int queue_num,
313 bool internal)
314{
315 blk_qc_t ret = tag | (queue_num << BLK_QC_T_SHIFT);
316
317 if (internal)
318 ret |= BLK_QC_T_INTERNAL;
319
320 return ret;
321}
322
323static inline unsigned int blk_qc_t_to_queue_num(blk_qc_t cookie)
324{
325 return (cookie & ~BLK_QC_T_INTERNAL) >> BLK_QC_T_SHIFT;
326}
327
328static inline unsigned int blk_qc_t_to_tag(blk_qc_t cookie)
329{
330 return cookie & ((1u << BLK_QC_T_SHIFT) - 1);
331}
332
333static inline bool blk_qc_t_is_internal(blk_qc_t cookie)
334{
335 return (cookie & BLK_QC_T_INTERNAL) != 0;
336}
337
338struct blk_rq_stat {
339 u64 mean;
340 u64 min;
341 u64 max;
342 u32 nr_samples;
343 u64 batch;
344};
345
346#endif
347