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1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * Block data types and constants. Directly include this file only to
4 * break include dependency loop.
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#include <linux/ktime.h>
12
13struct bio_set;
14struct bio;
15struct bio_integrity_payload;
16struct page;
17struct io_context;
18struct cgroup_subsys_state;
19typedef void (bio_end_io_t) (struct bio *);
20struct bio_crypt_ctx;
21
22struct block_device {
23 dev_t bd_dev; /* not a kdev_t - it's a search key */
24 int bd_openers;
25 struct inode * bd_inode; /* will die */
26 struct super_block * bd_super;
27 struct mutex bd_mutex; /* open/close mutex */
28 void * bd_claiming;
29 void * bd_holder;
30 int bd_holders;
31 bool bd_write_holder;
32#ifdef CONFIG_SYSFS
33 struct list_head bd_holder_disks;
34#endif
35 struct block_device * bd_contains;
36 u8 bd_partno;
37 struct hd_struct * bd_part;
38 /* number of times partitions within this device have been opened. */
39 unsigned bd_part_count;
40 int bd_invalidated;
41 struct gendisk * bd_disk;
42 struct backing_dev_info *bd_bdi;
43
44 /* The counter of freeze processes */
45 int bd_fsfreeze_count;
46 /* Mutex for freeze */
47 struct mutex bd_fsfreeze_mutex;
48} __randomize_layout;
49
50/*
51 * Block error status values. See block/blk-core:blk_errors for the details.
52 * Alpha cannot write a byte atomically, so we need to use 32-bit value.
53 */
54#if defined(CONFIG_ALPHA) && !defined(__alpha_bwx__)
55typedef u32 __bitwise blk_status_t;
56#else
57typedef u8 __bitwise blk_status_t;
58#endif
59#define BLK_STS_OK 0
60#define BLK_STS_NOTSUPP ((__force blk_status_t)1)
61#define BLK_STS_TIMEOUT ((__force blk_status_t)2)
62#define BLK_STS_NOSPC ((__force blk_status_t)3)
63#define BLK_STS_TRANSPORT ((__force blk_status_t)4)
64#define BLK_STS_TARGET ((__force blk_status_t)5)
65#define BLK_STS_NEXUS ((__force blk_status_t)6)
66#define BLK_STS_MEDIUM ((__force blk_status_t)7)
67#define BLK_STS_PROTECTION ((__force blk_status_t)8)
68#define BLK_STS_RESOURCE ((__force blk_status_t)9)
69#define BLK_STS_IOERR ((__force blk_status_t)10)
70
71/* hack for device mapper, don't use elsewhere: */
72#define BLK_STS_DM_REQUEUE ((__force blk_status_t)11)
73
74#define BLK_STS_AGAIN ((__force blk_status_t)12)
75
76/*
77 * BLK_STS_DEV_RESOURCE is returned from the driver to the block layer if
78 * device related resources are unavailable, but the driver can guarantee
79 * that the queue will be rerun in the future once resources become
80 * available again. This is typically the case for device specific
81 * resources that are consumed for IO. If the driver fails allocating these
82 * resources, we know that inflight (or pending) IO will free these
83 * resource upon completion.
84 *
85 * This is different from BLK_STS_RESOURCE in that it explicitly references
86 * a device specific resource. For resources of wider scope, allocation
87 * failure can happen without having pending IO. This means that we can't
88 * rely on request completions freeing these resources, as IO may not be in
89 * flight. Examples of that are kernel memory allocations, DMA mappings, or
90 * any other system wide resources.
91 */
92#define BLK_STS_DEV_RESOURCE ((__force blk_status_t)13)
93
94/*
95 * BLK_STS_ZONE_RESOURCE is returned from the driver to the block layer if zone
96 * related resources are unavailable, but the driver can guarantee the queue
97 * will be rerun in the future once the resources become available again.
98 *
99 * This is different from BLK_STS_DEV_RESOURCE in that it explicitly references
100 * a zone specific resource and IO to a different zone on the same device could
101 * still be served. Examples of that are zones that are write-locked, but a read
102 * to the same zone could be served.
103 */
104#define BLK_STS_ZONE_RESOURCE ((__force blk_status_t)14)
105
106/**
107 * blk_path_error - returns true if error may be path related
108 * @error: status the request was completed with
109 *
110 * Description:
111 * This classifies block error status into non-retryable errors and ones
112 * that may be successful if retried on a failover path.
113 *
114 * Return:
115 * %false - retrying failover path will not help
116 * %true - may succeed if retried
117 */
118static inline bool blk_path_error(blk_status_t error)
119{
120 switch (error) {
121 case BLK_STS_NOTSUPP:
122 case BLK_STS_NOSPC:
123 case BLK_STS_TARGET:
124 case BLK_STS_NEXUS:
125 case BLK_STS_MEDIUM:
126 case BLK_STS_PROTECTION:
127 return false;
128 }
129
130 /* Anything else could be a path failure, so should be retried */
131 return true;
132}
133
134/*
135 * From most significant bit:
136 * 1 bit: reserved for other usage, see below
137 * 12 bits: original size of bio
138 * 51 bits: issue time of bio
139 */
140#define BIO_ISSUE_RES_BITS 1
141#define BIO_ISSUE_SIZE_BITS 12
142#define BIO_ISSUE_RES_SHIFT (64 - BIO_ISSUE_RES_BITS)
143#define BIO_ISSUE_SIZE_SHIFT (BIO_ISSUE_RES_SHIFT - BIO_ISSUE_SIZE_BITS)
144#define BIO_ISSUE_TIME_MASK ((1ULL << BIO_ISSUE_SIZE_SHIFT) - 1)
145#define BIO_ISSUE_SIZE_MASK \
146 (((1ULL << BIO_ISSUE_SIZE_BITS) - 1) << BIO_ISSUE_SIZE_SHIFT)
147#define BIO_ISSUE_RES_MASK (~((1ULL << BIO_ISSUE_RES_SHIFT) - 1))
148
149/* Reserved bit for blk-throtl */
150#define BIO_ISSUE_THROTL_SKIP_LATENCY (1ULL << 63)
151
152struct bio_issue {
153 u64 value;
154};
155
156static inline u64 __bio_issue_time(u64 time)
157{
158 return time & BIO_ISSUE_TIME_MASK;
159}
160
161static inline u64 bio_issue_time(struct bio_issue *issue)
162{
163 return __bio_issue_time(issue->value);
164}
165
166static inline sector_t bio_issue_size(struct bio_issue *issue)
167{
168 return ((issue->value & BIO_ISSUE_SIZE_MASK) >> BIO_ISSUE_SIZE_SHIFT);
169}
170
171static inline void bio_issue_init(struct bio_issue *issue,
172 sector_t size)
173{
174 size &= (1ULL << BIO_ISSUE_SIZE_BITS) - 1;
175 issue->value = ((issue->value & BIO_ISSUE_RES_MASK) |
176 (ktime_get_ns() & BIO_ISSUE_TIME_MASK) |
177 ((u64)size << BIO_ISSUE_SIZE_SHIFT));
178}
179
180/*
181 * main unit of I/O for the block layer and lower layers (ie drivers and
182 * stacking drivers)
183 */
184struct bio {
185 struct bio *bi_next; /* request queue link */
186 struct gendisk *bi_disk;
187 unsigned int bi_opf; /* bottom bits req flags,
188 * top bits REQ_OP. Use
189 * accessors.
190 */
191 unsigned short bi_flags; /* status, etc and bvec pool number */
192 unsigned short bi_ioprio;
193 unsigned short bi_write_hint;
194 blk_status_t bi_status;
195 u8 bi_partno;
196 atomic_t __bi_remaining;
197
198 struct bvec_iter bi_iter;
199
200 bio_end_io_t *bi_end_io;
201
202 void *bi_private;
203#ifdef CONFIG_BLK_CGROUP
204 /*
205 * Represents the association of the css and request_queue for the bio.
206 * If a bio goes direct to device, it will not have a blkg as it will
207 * not have a request_queue associated with it. The reference is put
208 * on release of the bio.
209 */
210 struct blkcg_gq *bi_blkg;
211 struct bio_issue bi_issue;
212#ifdef CONFIG_BLK_CGROUP_IOCOST
213 u64 bi_iocost_cost;
214#endif
215#endif
216
217#ifdef CONFIG_BLK_INLINE_ENCRYPTION
218 struct bio_crypt_ctx *bi_crypt_context;
219#endif
220
221 union {
222#if defined(CONFIG_BLK_DEV_INTEGRITY)
223 struct bio_integrity_payload *bi_integrity; /* data integrity */
224#endif
225 };
226
227 unsigned short bi_vcnt; /* how many bio_vec's */
228
229 /*
230 * Everything starting with bi_max_vecs will be preserved by bio_reset()
231 */
232
233 unsigned short bi_max_vecs; /* max bvl_vecs we can hold */
234
235 atomic_t __bi_cnt; /* pin count */
236
237 struct bio_vec *bi_io_vec; /* the actual vec list */
238
239 struct bio_set *bi_pool;
240
241 /*
242 * We can inline a number of vecs at the end of the bio, to avoid
243 * double allocations for a small number of bio_vecs. This member
244 * MUST obviously be kept at the very end of the bio.
245 */
246 struct bio_vec bi_inline_vecs[];
247};
248
249#define BIO_RESET_BYTES offsetof(struct bio, bi_max_vecs)
250
251/*
252 * bio flags
253 */
254enum {
255 BIO_NO_PAGE_REF, /* don't put release vec pages */
256 BIO_CLONED, /* doesn't own data */
257 BIO_BOUNCED, /* bio is a bounce bio */
258 BIO_USER_MAPPED, /* contains user pages */
259 BIO_NULL_MAPPED, /* contains invalid user pages */
260 BIO_WORKINGSET, /* contains userspace workingset pages */
261 BIO_QUIET, /* Make BIO Quiet */
262 BIO_CHAIN, /* chained bio, ->bi_remaining in effect */
263 BIO_REFFED, /* bio has elevated ->bi_cnt */
264 BIO_THROTTLED, /* This bio has already been subjected to
265 * throttling rules. Don't do it again. */
266 BIO_TRACE_COMPLETION, /* bio_endio() should trace the final completion
267 * of this bio. */
268 BIO_CGROUP_ACCT, /* has been accounted to a cgroup */
269 BIO_TRACKED, /* set if bio goes through the rq_qos path */
270 BIO_FLAG_LAST
271};
272
273/* See BVEC_POOL_OFFSET below before adding new flags */
274
275/*
276 * We support 6 different bvec pools, the last one is magic in that it
277 * is backed by a mempool.
278 */
279#define BVEC_POOL_NR 6
280#define BVEC_POOL_MAX (BVEC_POOL_NR - 1)
281
282/*
283 * Top 3 bits of bio flags indicate the pool the bvecs came from. We add
284 * 1 to the actual index so that 0 indicates that there are no bvecs to be
285 * freed.
286 */
287#define BVEC_POOL_BITS (3)
288#define BVEC_POOL_OFFSET (16 - BVEC_POOL_BITS)
289#define BVEC_POOL_IDX(bio) ((bio)->bi_flags >> BVEC_POOL_OFFSET)
290#if (1<< BVEC_POOL_BITS) < (BVEC_POOL_NR+1)
291# error "BVEC_POOL_BITS is too small"
292#endif
293
294/*
295 * Flags starting here get preserved by bio_reset() - this includes
296 * only BVEC_POOL_IDX()
297 */
298#define BIO_RESET_BITS BVEC_POOL_OFFSET
299
300typedef __u32 __bitwise blk_mq_req_flags_t;
301
302/*
303 * Operations and flags common to the bio and request structures.
304 * We use 8 bits for encoding the operation, and the remaining 24 for flags.
305 *
306 * The least significant bit of the operation number indicates the data
307 * transfer direction:
308 *
309 * - if the least significant bit is set transfers are TO the device
310 * - if the least significant bit is not set transfers are FROM the device
311 *
312 * If a operation does not transfer data the least significant bit has no
313 * meaning.
314 */
315#define REQ_OP_BITS 8
316#define REQ_OP_MASK ((1 << REQ_OP_BITS) - 1)
317#define REQ_FLAG_BITS 24
318
319enum req_opf {
320 /* read sectors from the device */
321 REQ_OP_READ = 0,
322 /* write sectors to the device */
323 REQ_OP_WRITE = 1,
324 /* flush the volatile write cache */
325 REQ_OP_FLUSH = 2,
326 /* discard sectors */
327 REQ_OP_DISCARD = 3,
328 /* securely erase sectors */
329 REQ_OP_SECURE_ERASE = 5,
330 /* write the same sector many times */
331 REQ_OP_WRITE_SAME = 7,
332 /* write the zero filled sector many times */
333 REQ_OP_WRITE_ZEROES = 9,
334 /* Open a zone */
335 REQ_OP_ZONE_OPEN = 10,
336 /* Close a zone */
337 REQ_OP_ZONE_CLOSE = 11,
338 /* Transition a zone to full */
339 REQ_OP_ZONE_FINISH = 12,
340 /* write data at the current zone write pointer */
341 REQ_OP_ZONE_APPEND = 13,
342 /* reset a zone write pointer */
343 REQ_OP_ZONE_RESET = 15,
344 /* reset all the zone present on the device */
345 REQ_OP_ZONE_RESET_ALL = 17,
346
347 /* SCSI passthrough using struct scsi_request */
348 REQ_OP_SCSI_IN = 32,
349 REQ_OP_SCSI_OUT = 33,
350 /* Driver private requests */
351 REQ_OP_DRV_IN = 34,
352 REQ_OP_DRV_OUT = 35,
353
354 REQ_OP_LAST,
355};
356
357enum req_flag_bits {
358 __REQ_FAILFAST_DEV = /* no driver retries of device errors */
359 REQ_OP_BITS,
360 __REQ_FAILFAST_TRANSPORT, /* no driver retries of transport errors */
361 __REQ_FAILFAST_DRIVER, /* no driver retries of driver errors */
362 __REQ_SYNC, /* request is sync (sync write or read) */
363 __REQ_META, /* metadata io request */
364 __REQ_PRIO, /* boost priority in cfq */
365 __REQ_NOMERGE, /* don't touch this for merging */
366 __REQ_IDLE, /* anticipate more IO after this one */
367 __REQ_INTEGRITY, /* I/O includes block integrity payload */
368 __REQ_FUA, /* forced unit access */
369 __REQ_PREFLUSH, /* request for cache flush */
370 __REQ_RAHEAD, /* read ahead, can fail anytime */
371 __REQ_BACKGROUND, /* background IO */
372 __REQ_NOWAIT, /* Don't wait if request will block */
373 /*
374 * When a shared kthread needs to issue a bio for a cgroup, doing
375 * so synchronously can lead to priority inversions as the kthread
376 * can be trapped waiting for that cgroup. CGROUP_PUNT flag makes
377 * submit_bio() punt the actual issuing to a dedicated per-blkcg
378 * work item to avoid such priority inversions.
379 */
380 __REQ_CGROUP_PUNT,
381
382 /* command specific flags for REQ_OP_WRITE_ZEROES: */
383 __REQ_NOUNMAP, /* do not free blocks when zeroing */
384
385 __REQ_HIPRI,
386
387 /* for driver use */
388 __REQ_DRV,
389 __REQ_SWAP, /* swapping request. */
390 __REQ_NR_BITS, /* stops here */
391};
392
393#define REQ_FAILFAST_DEV (1ULL << __REQ_FAILFAST_DEV)
394#define REQ_FAILFAST_TRANSPORT (1ULL << __REQ_FAILFAST_TRANSPORT)
395#define REQ_FAILFAST_DRIVER (1ULL << __REQ_FAILFAST_DRIVER)
396#define REQ_SYNC (1ULL << __REQ_SYNC)
397#define REQ_META (1ULL << __REQ_META)
398#define REQ_PRIO (1ULL << __REQ_PRIO)
399#define REQ_NOMERGE (1ULL << __REQ_NOMERGE)
400#define REQ_IDLE (1ULL << __REQ_IDLE)
401#define REQ_INTEGRITY (1ULL << __REQ_INTEGRITY)
402#define REQ_FUA (1ULL << __REQ_FUA)
403#define REQ_PREFLUSH (1ULL << __REQ_PREFLUSH)
404#define REQ_RAHEAD (1ULL << __REQ_RAHEAD)
405#define REQ_BACKGROUND (1ULL << __REQ_BACKGROUND)
406#define REQ_NOWAIT (1ULL << __REQ_NOWAIT)
407#define REQ_CGROUP_PUNT (1ULL << __REQ_CGROUP_PUNT)
408
409#define REQ_NOUNMAP (1ULL << __REQ_NOUNMAP)
410#define REQ_HIPRI (1ULL << __REQ_HIPRI)
411
412#define REQ_DRV (1ULL << __REQ_DRV)
413#define REQ_SWAP (1ULL << __REQ_SWAP)
414
415#define REQ_FAILFAST_MASK \
416 (REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT | REQ_FAILFAST_DRIVER)
417
418#define REQ_NOMERGE_FLAGS \
419 (REQ_NOMERGE | REQ_PREFLUSH | REQ_FUA)
420
421enum stat_group {
422 STAT_READ,
423 STAT_WRITE,
424 STAT_DISCARD,
425 STAT_FLUSH,
426
427 NR_STAT_GROUPS
428};
429
430#define bio_op(bio) \
431 ((bio)->bi_opf & REQ_OP_MASK)
432#define req_op(req) \
433 ((req)->cmd_flags & REQ_OP_MASK)
434
435/* obsolete, don't use in new code */
436static inline void bio_set_op_attrs(struct bio *bio, unsigned op,
437 unsigned op_flags)
438{
439 bio->bi_opf = op | op_flags;
440}
441
442static inline bool op_is_write(unsigned int op)
443{
444 return (op & 1);
445}
446
447/*
448 * Check if the bio or request is one that needs special treatment in the
449 * flush state machine.
450 */
451static inline bool op_is_flush(unsigned int op)
452{
453 return op & (REQ_FUA | REQ_PREFLUSH);
454}
455
456/*
457 * Reads are always treated as synchronous, as are requests with the FUA or
458 * PREFLUSH flag. Other operations may be marked as synchronous using the
459 * REQ_SYNC flag.
460 */
461static inline bool op_is_sync(unsigned int op)
462{
463 return (op & REQ_OP_MASK) == REQ_OP_READ ||
464 (op & (REQ_SYNC | REQ_FUA | REQ_PREFLUSH));
465}
466
467static inline bool op_is_discard(unsigned int op)
468{
469 return (op & REQ_OP_MASK) == REQ_OP_DISCARD;
470}
471
472/*
473 * Check if a bio or request operation is a zone management operation, with
474 * the exception of REQ_OP_ZONE_RESET_ALL which is treated as a special case
475 * due to its different handling in the block layer and device response in
476 * case of command failure.
477 */
478static inline bool op_is_zone_mgmt(enum req_opf op)
479{
480 switch (op & REQ_OP_MASK) {
481 case REQ_OP_ZONE_RESET:
482 case REQ_OP_ZONE_OPEN:
483 case REQ_OP_ZONE_CLOSE:
484 case REQ_OP_ZONE_FINISH:
485 return true;
486 default:
487 return false;
488 }
489}
490
491static inline int op_stat_group(unsigned int op)
492{
493 if (op_is_discard(op))
494 return STAT_DISCARD;
495 return op_is_write(op);
496}
497
498typedef unsigned int blk_qc_t;
499#define BLK_QC_T_NONE -1U
500#define BLK_QC_T_SHIFT 16
501#define BLK_QC_T_INTERNAL (1U << 31)
502
503static inline bool blk_qc_t_valid(blk_qc_t cookie)
504{
505 return cookie != BLK_QC_T_NONE;
506}
507
508static inline unsigned int blk_qc_t_to_queue_num(blk_qc_t cookie)
509{
510 return (cookie & ~BLK_QC_T_INTERNAL) >> BLK_QC_T_SHIFT;
511}
512
513static inline unsigned int blk_qc_t_to_tag(blk_qc_t cookie)
514{
515 return cookie & ((1u << BLK_QC_T_SHIFT) - 1);
516}
517
518static inline bool blk_qc_t_is_internal(blk_qc_t cookie)
519{
520 return (cookie & BLK_QC_T_INTERNAL) != 0;
521}
522
523struct blk_rq_stat {
524 u64 mean;
525 u64 min;
526 u64 max;
527 u32 nr_samples;
528 u64 batch;
529};
530
531#endif /* __LINUX_BLK_TYPES_H */
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
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 *, int);
20typedef 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 */
25struct 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 */
35struct 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
62 unsigned int bi_max_vecs; /* max bvl_vecs we can hold */
63
64 atomic_t bi_cnt; /* pin count */
65
66 struct bio_vec *bi_io_vec; /* the actual vec list */
67
68 bio_end_io_t *bi_end_io;
69
70 void *bi_private;
71#ifdef CONFIG_BLK_CGROUP
72 /*
73 * Optional ioc and css associated with this bio. Put on bio
74 * release. Read comment on top of bio_associate_current().
75 */
76 struct io_context *bi_ioc;
77 struct cgroup_subsys_state *bi_css;
78#endif
79#if defined(CONFIG_BLK_DEV_INTEGRITY)
80 struct bio_integrity_payload *bi_integrity; /* data integrity */
81#endif
82
83 bio_destructor_t *bi_destructor; /* destructor */
84
85 /*
86 * We can inline a number of vecs at the end of the bio, to avoid
87 * double allocations for a small number of bio_vecs. This member
88 * MUST obviously be kept at the very end of the bio.
89 */
90 struct bio_vec bi_inline_vecs[0];
91};
92
93/*
94 * bio flags
95 */
96#define BIO_UPTODATE 0 /* ok after I/O completion */
97#define BIO_RW_BLOCK 1 /* RW_AHEAD set, and read/write would block */
98#define BIO_EOF 2 /* out-out-bounds error */
99#define BIO_SEG_VALID 3 /* bi_phys_segments valid */
100#define BIO_CLONED 4 /* doesn't own data */
101#define BIO_BOUNCED 5 /* bio is a bounce bio */
102#define BIO_USER_MAPPED 6 /* contains user pages */
103#define BIO_EOPNOTSUPP 7 /* not supported */
104#define BIO_NULL_MAPPED 8 /* contains invalid user pages */
105#define BIO_FS_INTEGRITY 9 /* fs owns integrity data, not block layer */
106#define BIO_QUIET 10 /* Make BIO Quiet */
107#define BIO_MAPPED_INTEGRITY 11/* integrity metadata has been remapped */
108#define bio_flagged(bio, flag) ((bio)->bi_flags & (1 << (flag)))
109
110/*
111 * top 4 bits of bio flags indicate the pool this bio came from
112 */
113#define BIO_POOL_BITS (4)
114#define BIO_POOL_NONE ((1UL << BIO_POOL_BITS) - 1)
115#define BIO_POOL_OFFSET (BITS_PER_LONG - BIO_POOL_BITS)
116#define BIO_POOL_MASK (1UL << BIO_POOL_OFFSET)
117#define BIO_POOL_IDX(bio) ((bio)->bi_flags >> BIO_POOL_OFFSET)
118
119#endif /* CONFIG_BLOCK */
120
121/*
122 * Request flags. For use in the cmd_flags field of struct request, and in
123 * bi_rw of struct bio. Note that some flags are only valid in either one.
124 */
125enum rq_flag_bits {
126 /* common flags */
127 __REQ_WRITE, /* not set, read. set, write */
128 __REQ_FAILFAST_DEV, /* no driver retries of device errors */
129 __REQ_FAILFAST_TRANSPORT, /* no driver retries of transport errors */
130 __REQ_FAILFAST_DRIVER, /* no driver retries of driver errors */
131
132 __REQ_SYNC, /* request is sync (sync write or read) */
133 __REQ_META, /* metadata io request */
134 __REQ_PRIO, /* boost priority in cfq */
135 __REQ_DISCARD, /* request to discard sectors */
136 __REQ_SECURE, /* secure discard (used with __REQ_DISCARD) */
137
138 __REQ_NOIDLE, /* don't anticipate more IO after this one */
139 __REQ_FUA, /* forced unit access */
140 __REQ_FLUSH, /* request for cache flush */
141
142 /* bio only flags */
143 __REQ_RAHEAD, /* read ahead, can fail anytime */
144 __REQ_THROTTLED, /* This bio has already been subjected to
145 * throttling rules. Don't do it again. */
146
147 /* request only flags */
148 __REQ_SORTED, /* elevator knows about this request */
149 __REQ_SOFTBARRIER, /* may not be passed by ioscheduler */
150 __REQ_NOMERGE, /* don't touch this for merging */
151 __REQ_STARTED, /* drive already may have started this one */
152 __REQ_DONTPREP, /* don't call prep for this one */
153 __REQ_QUEUED, /* uses queueing */
154 __REQ_ELVPRIV, /* elevator private data attached */
155 __REQ_FAILED, /* set if the request failed */
156 __REQ_QUIET, /* don't worry about errors */
157 __REQ_PREEMPT, /* set for "ide_preempt" requests */
158 __REQ_ALLOCED, /* request came from our alloc pool */
159 __REQ_COPY_USER, /* contains copies of user pages */
160 __REQ_FLUSH_SEQ, /* request for flush sequence */
161 __REQ_IO_STAT, /* account I/O stat */
162 __REQ_MIXED_MERGE, /* merge of different types, fail separately */
163 __REQ_NR_BITS, /* stops here */
164};
165
166#define REQ_WRITE (1 << __REQ_WRITE)
167#define REQ_FAILFAST_DEV (1 << __REQ_FAILFAST_DEV)
168#define REQ_FAILFAST_TRANSPORT (1 << __REQ_FAILFAST_TRANSPORT)
169#define REQ_FAILFAST_DRIVER (1 << __REQ_FAILFAST_DRIVER)
170#define REQ_SYNC (1 << __REQ_SYNC)
171#define REQ_META (1 << __REQ_META)
172#define REQ_PRIO (1 << __REQ_PRIO)
173#define REQ_DISCARD (1 << __REQ_DISCARD)
174#define REQ_NOIDLE (1 << __REQ_NOIDLE)
175
176#define REQ_FAILFAST_MASK \
177 (REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT | REQ_FAILFAST_DRIVER)
178#define REQ_COMMON_MASK \
179 (REQ_WRITE | REQ_FAILFAST_MASK | REQ_SYNC | REQ_META | REQ_PRIO | \
180 REQ_DISCARD | REQ_NOIDLE | REQ_FLUSH | REQ_FUA | REQ_SECURE)
181#define REQ_CLONE_MASK REQ_COMMON_MASK
182
183#define REQ_RAHEAD (1 << __REQ_RAHEAD)
184#define REQ_THROTTLED (1 << __REQ_THROTTLED)
185
186#define REQ_SORTED (1 << __REQ_SORTED)
187#define REQ_SOFTBARRIER (1 << __REQ_SOFTBARRIER)
188#define REQ_FUA (1 << __REQ_FUA)
189#define REQ_NOMERGE (1 << __REQ_NOMERGE)
190#define REQ_STARTED (1 << __REQ_STARTED)
191#define REQ_DONTPREP (1 << __REQ_DONTPREP)
192#define REQ_QUEUED (1 << __REQ_QUEUED)
193#define REQ_ELVPRIV (1 << __REQ_ELVPRIV)
194#define REQ_FAILED (1 << __REQ_FAILED)
195#define REQ_QUIET (1 << __REQ_QUIET)
196#define REQ_PREEMPT (1 << __REQ_PREEMPT)
197#define REQ_ALLOCED (1 << __REQ_ALLOCED)
198#define REQ_COPY_USER (1 << __REQ_COPY_USER)
199#define REQ_FLUSH (1 << __REQ_FLUSH)
200#define REQ_FLUSH_SEQ (1 << __REQ_FLUSH_SEQ)
201#define REQ_IO_STAT (1 << __REQ_IO_STAT)
202#define REQ_MIXED_MERGE (1 << __REQ_MIXED_MERGE)
203#define REQ_SECURE (1 << __REQ_SECURE)
204
205#endif /* __LINUX_BLK_TYPES_H */