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/device.h> |
12 | #include <linux/ktime.h> |
13 | |
14 | struct bio_set; |
15 | struct bio; |
16 | struct bio_integrity_payload; |
17 | struct page; |
18 | struct io_context; |
19 | struct cgroup_subsys_state; |
20 | typedef void (bio_end_io_t) (struct bio *); |
21 | struct bio_crypt_ctx; |
22 | |
23 | /* |
24 | * The basic unit of block I/O is a sector. It is used in a number of contexts |
25 | * in Linux (blk, bio, genhd). The size of one sector is 512 = 2**9 |
26 | * bytes. Variables of type sector_t represent an offset or size that is a |
27 | * multiple of 512 bytes. Hence these two constants. |
28 | */ |
29 | #ifndef SECTOR_SHIFT |
30 | #define SECTOR_SHIFT 9 |
31 | #endif |
32 | #ifndef SECTOR_SIZE |
33 | #define SECTOR_SIZE (1 << SECTOR_SHIFT) |
34 | #endif |
35 | |
36 | #define PAGE_SECTORS_SHIFT (PAGE_SHIFT - SECTOR_SHIFT) |
37 | #define PAGE_SECTORS (1 << PAGE_SECTORS_SHIFT) |
38 | #define SECTOR_MASK (PAGE_SECTORS - 1) |
39 | |
40 | struct block_device { |
41 | sector_t bd_start_sect; |
42 | sector_t bd_nr_sectors; |
43 | struct gendisk * bd_disk; |
44 | struct request_queue * bd_queue; |
45 | struct disk_stats __percpu *bd_stats; |
46 | unsigned long bd_stamp; |
47 | bool bd_read_only; /* read-only policy */ |
48 | u8 bd_partno; |
49 | bool bd_write_holder; |
50 | bool bd_has_submit_bio; |
51 | dev_t bd_dev; |
52 | atomic_t bd_openers; |
53 | spinlock_t bd_size_lock; /* for bd_inode->i_size updates */ |
54 | struct inode * bd_inode; /* will die */ |
55 | void * bd_claiming; |
56 | void * bd_holder; |
57 | const struct blk_holder_ops *bd_holder_ops; |
58 | struct mutex bd_holder_lock; |
59 | /* The counter of freeze processes */ |
60 | int bd_fsfreeze_count; |
61 | int bd_holders; |
62 | struct kobject *bd_holder_dir; |
63 | |
64 | /* Mutex for freeze */ |
65 | struct mutex bd_fsfreeze_mutex; |
66 | struct super_block *bd_fsfreeze_sb; |
67 | |
68 | struct partition_meta_info *bd_meta_info; |
69 | #ifdef CONFIG_FAIL_MAKE_REQUEST |
70 | bool bd_make_it_fail; |
71 | #endif |
72 | /* |
73 | * keep this out-of-line as it's both big and not needed in the fast |
74 | * path |
75 | */ |
76 | struct device bd_device; |
77 | } __randomize_layout; |
78 | |
79 | #define bdev_whole(_bdev) \ |
80 | ((_bdev)->bd_disk->part0) |
81 | |
82 | #define dev_to_bdev(device) \ |
83 | container_of((device), struct block_device, bd_device) |
84 | |
85 | #define bdev_kobj(_bdev) \ |
86 | (&((_bdev)->bd_device.kobj)) |
87 | |
88 | /* |
89 | * Block error status values. See block/blk-core:blk_errors for the details. |
90 | * Alpha cannot write a byte atomically, so we need to use 32-bit value. |
91 | */ |
92 | #if defined(CONFIG_ALPHA) && !defined(__alpha_bwx__) |
93 | typedef u32 __bitwise blk_status_t; |
94 | typedef u32 blk_short_t; |
95 | #else |
96 | typedef u8 __bitwise blk_status_t; |
97 | typedef u16 blk_short_t; |
98 | #endif |
99 | #define BLK_STS_OK 0 |
100 | #define BLK_STS_NOTSUPP ((__force blk_status_t)1) |
101 | #define BLK_STS_TIMEOUT ((__force blk_status_t)2) |
102 | #define BLK_STS_NOSPC ((__force blk_status_t)3) |
103 | #define BLK_STS_TRANSPORT ((__force blk_status_t)4) |
104 | #define BLK_STS_TARGET ((__force blk_status_t)5) |
105 | #define BLK_STS_RESV_CONFLICT ((__force blk_status_t)6) |
106 | #define BLK_STS_MEDIUM ((__force blk_status_t)7) |
107 | #define BLK_STS_PROTECTION ((__force blk_status_t)8) |
108 | #define BLK_STS_RESOURCE ((__force blk_status_t)9) |
109 | #define BLK_STS_IOERR ((__force blk_status_t)10) |
110 | |
111 | /* hack for device mapper, don't use elsewhere: */ |
112 | #define BLK_STS_DM_REQUEUE ((__force blk_status_t)11) |
113 | |
114 | /* |
115 | * BLK_STS_AGAIN should only be returned if RQF_NOWAIT is set |
116 | * and the bio would block (cf bio_wouldblock_error()) |
117 | */ |
118 | #define BLK_STS_AGAIN ((__force blk_status_t)12) |
119 | |
120 | /* |
121 | * BLK_STS_DEV_RESOURCE is returned from the driver to the block layer if |
122 | * device related resources are unavailable, but the driver can guarantee |
123 | * that the queue will be rerun in the future once resources become |
124 | * available again. This is typically the case for device specific |
125 | * resources that are consumed for IO. If the driver fails allocating these |
126 | * resources, we know that inflight (or pending) IO will free these |
127 | * resource upon completion. |
128 | * |
129 | * This is different from BLK_STS_RESOURCE in that it explicitly references |
130 | * a device specific resource. For resources of wider scope, allocation |
131 | * failure can happen without having pending IO. This means that we can't |
132 | * rely on request completions freeing these resources, as IO may not be in |
133 | * flight. Examples of that are kernel memory allocations, DMA mappings, or |
134 | * any other system wide resources. |
135 | */ |
136 | #define BLK_STS_DEV_RESOURCE ((__force blk_status_t)13) |
137 | |
138 | /* |
139 | * BLK_STS_ZONE_RESOURCE is returned from the driver to the block layer if zone |
140 | * related resources are unavailable, but the driver can guarantee the queue |
141 | * will be rerun in the future once the resources become available again. |
142 | * |
143 | * This is different from BLK_STS_DEV_RESOURCE in that it explicitly references |
144 | * a zone specific resource and IO to a different zone on the same device could |
145 | * still be served. Examples of that are zones that are write-locked, but a read |
146 | * to the same zone could be served. |
147 | */ |
148 | #define BLK_STS_ZONE_RESOURCE ((__force blk_status_t)14) |
149 | |
150 | /* |
151 | * BLK_STS_ZONE_OPEN_RESOURCE is returned from the driver in the completion |
152 | * path if the device returns a status indicating that too many zone resources |
153 | * are currently open. The same command should be successful if resubmitted |
154 | * after the number of open zones decreases below the device's limits, which is |
155 | * reported in the request_queue's max_open_zones. |
156 | */ |
157 | #define BLK_STS_ZONE_OPEN_RESOURCE ((__force blk_status_t)15) |
158 | |
159 | /* |
160 | * BLK_STS_ZONE_ACTIVE_RESOURCE is returned from the driver in the completion |
161 | * path if the device returns a status indicating that too many zone resources |
162 | * are currently active. The same command should be successful if resubmitted |
163 | * after the number of active zones decreases below the device's limits, which |
164 | * is reported in the request_queue's max_active_zones. |
165 | */ |
166 | #define BLK_STS_ZONE_ACTIVE_RESOURCE ((__force blk_status_t)16) |
167 | |
168 | /* |
169 | * BLK_STS_OFFLINE is returned from the driver when the target device is offline |
170 | * or is being taken offline. This could help differentiate the case where a |
171 | * device is intentionally being shut down from a real I/O error. |
172 | */ |
173 | #define BLK_STS_OFFLINE ((__force blk_status_t)17) |
174 | |
175 | /* |
176 | * BLK_STS_DURATION_LIMIT is returned from the driver when the target device |
177 | * aborted the command because it exceeded one of its Command Duration Limits. |
178 | */ |
179 | #define BLK_STS_DURATION_LIMIT ((__force blk_status_t)18) |
180 | |
181 | /** |
182 | * blk_path_error - returns true if error may be path related |
183 | * @error: status the request was completed with |
184 | * |
185 | * Description: |
186 | * This classifies block error status into non-retryable errors and ones |
187 | * that may be successful if retried on a failover path. |
188 | * |
189 | * Return: |
190 | * %false - retrying failover path will not help |
191 | * %true - may succeed if retried |
192 | */ |
193 | static inline bool blk_path_error(blk_status_t error) |
194 | { |
195 | switch (error) { |
196 | case BLK_STS_NOTSUPP: |
197 | case BLK_STS_NOSPC: |
198 | case BLK_STS_TARGET: |
199 | case BLK_STS_RESV_CONFLICT: |
200 | case BLK_STS_MEDIUM: |
201 | case BLK_STS_PROTECTION: |
202 | return false; |
203 | } |
204 | |
205 | /* Anything else could be a path failure, so should be retried */ |
206 | return true; |
207 | } |
208 | |
209 | /* |
210 | * From most significant bit: |
211 | * 1 bit: reserved for other usage, see below |
212 | * 12 bits: original size of bio |
213 | * 51 bits: issue time of bio |
214 | */ |
215 | #define BIO_ISSUE_RES_BITS 1 |
216 | #define BIO_ISSUE_SIZE_BITS 12 |
217 | #define BIO_ISSUE_RES_SHIFT (64 - BIO_ISSUE_RES_BITS) |
218 | #define BIO_ISSUE_SIZE_SHIFT (BIO_ISSUE_RES_SHIFT - BIO_ISSUE_SIZE_BITS) |
219 | #define BIO_ISSUE_TIME_MASK ((1ULL << BIO_ISSUE_SIZE_SHIFT) - 1) |
220 | #define BIO_ISSUE_SIZE_MASK \ |
221 | (((1ULL << BIO_ISSUE_SIZE_BITS) - 1) << BIO_ISSUE_SIZE_SHIFT) |
222 | #define BIO_ISSUE_RES_MASK (~((1ULL << BIO_ISSUE_RES_SHIFT) - 1)) |
223 | |
224 | /* Reserved bit for blk-throtl */ |
225 | #define BIO_ISSUE_THROTL_SKIP_LATENCY (1ULL << 63) |
226 | |
227 | struct bio_issue { |
228 | u64 value; |
229 | }; |
230 | |
231 | static inline u64 __bio_issue_time(u64 time) |
232 | { |
233 | return time & BIO_ISSUE_TIME_MASK; |
234 | } |
235 | |
236 | static inline u64 bio_issue_time(struct bio_issue *issue) |
237 | { |
238 | return __bio_issue_time(time: issue->value); |
239 | } |
240 | |
241 | static inline sector_t bio_issue_size(struct bio_issue *issue) |
242 | { |
243 | return ((issue->value & BIO_ISSUE_SIZE_MASK) >> BIO_ISSUE_SIZE_SHIFT); |
244 | } |
245 | |
246 | static inline void bio_issue_init(struct bio_issue *issue, |
247 | sector_t size) |
248 | { |
249 | size &= (1ULL << BIO_ISSUE_SIZE_BITS) - 1; |
250 | issue->value = ((issue->value & BIO_ISSUE_RES_MASK) | |
251 | (ktime_get_ns() & BIO_ISSUE_TIME_MASK) | |
252 | ((u64)size << BIO_ISSUE_SIZE_SHIFT)); |
253 | } |
254 | |
255 | typedef __u32 __bitwise blk_opf_t; |
256 | |
257 | typedef unsigned int blk_qc_t; |
258 | #define BLK_QC_T_NONE -1U |
259 | |
260 | /* |
261 | * main unit of I/O for the block layer and lower layers (ie drivers and |
262 | * stacking drivers) |
263 | */ |
264 | struct bio { |
265 | struct bio *bi_next; /* request queue link */ |
266 | struct block_device *bi_bdev; |
267 | blk_opf_t bi_opf; /* bottom bits REQ_OP, top bits |
268 | * req_flags. |
269 | */ |
270 | unsigned short bi_flags; /* BIO_* below */ |
271 | unsigned short bi_ioprio; |
272 | blk_status_t bi_status; |
273 | atomic_t __bi_remaining; |
274 | |
275 | struct bvec_iter bi_iter; |
276 | |
277 | blk_qc_t bi_cookie; |
278 | bio_end_io_t *bi_end_io; |
279 | void *bi_private; |
280 | #ifdef CONFIG_BLK_CGROUP |
281 | /* |
282 | * Represents the association of the css and request_queue for the bio. |
283 | * If a bio goes direct to device, it will not have a blkg as it will |
284 | * not have a request_queue associated with it. The reference is put |
285 | * on release of the bio. |
286 | */ |
287 | struct blkcg_gq *bi_blkg; |
288 | struct bio_issue bi_issue; |
289 | #ifdef CONFIG_BLK_CGROUP_IOCOST |
290 | u64 bi_iocost_cost; |
291 | #endif |
292 | #endif |
293 | |
294 | #ifdef CONFIG_BLK_INLINE_ENCRYPTION |
295 | struct bio_crypt_ctx *bi_crypt_context; |
296 | #endif |
297 | |
298 | union { |
299 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
300 | struct bio_integrity_payload *bi_integrity; /* data integrity */ |
301 | #endif |
302 | }; |
303 | |
304 | unsigned short bi_vcnt; /* how many bio_vec's */ |
305 | |
306 | /* |
307 | * Everything starting with bi_max_vecs will be preserved by bio_reset() |
308 | */ |
309 | |
310 | unsigned short bi_max_vecs; /* max bvl_vecs we can hold */ |
311 | |
312 | atomic_t __bi_cnt; /* pin count */ |
313 | |
314 | struct bio_vec *bi_io_vec; /* the actual vec list */ |
315 | |
316 | struct bio_set *bi_pool; |
317 | |
318 | /* |
319 | * We can inline a number of vecs at the end of the bio, to avoid |
320 | * double allocations for a small number of bio_vecs. This member |
321 | * MUST obviously be kept at the very end of the bio. |
322 | */ |
323 | struct bio_vec bi_inline_vecs[]; |
324 | }; |
325 | |
326 | #define BIO_RESET_BYTES offsetof(struct bio, bi_max_vecs) |
327 | #define BIO_MAX_SECTORS (UINT_MAX >> SECTOR_SHIFT) |
328 | |
329 | /* |
330 | * bio flags |
331 | */ |
332 | enum { |
333 | BIO_PAGE_PINNED, /* Unpin pages in bio_release_pages() */ |
334 | BIO_CLONED, /* doesn't own data */ |
335 | BIO_BOUNCED, /* bio is a bounce bio */ |
336 | BIO_QUIET, /* Make BIO Quiet */ |
337 | BIO_CHAIN, /* chained bio, ->bi_remaining in effect */ |
338 | BIO_REFFED, /* bio has elevated ->bi_cnt */ |
339 | BIO_BPS_THROTTLED, /* This bio has already been subjected to |
340 | * throttling rules. Don't do it again. */ |
341 | BIO_TRACE_COMPLETION, /* bio_endio() should trace the final completion |
342 | * of this bio. */ |
343 | BIO_CGROUP_ACCT, /* has been accounted to a cgroup */ |
344 | BIO_QOS_THROTTLED, /* bio went through rq_qos throttle path */ |
345 | BIO_QOS_MERGED, /* but went through rq_qos merge path */ |
346 | BIO_REMAPPED, |
347 | BIO_ZONE_WRITE_LOCKED, /* Owns a zoned device zone write lock */ |
348 | BIO_FLAG_LAST |
349 | }; |
350 | |
351 | typedef __u32 __bitwise blk_mq_req_flags_t; |
352 | |
353 | #define REQ_OP_BITS 8 |
354 | #define REQ_OP_MASK (__force blk_opf_t)((1 << REQ_OP_BITS) - 1) |
355 | #define REQ_FLAG_BITS 24 |
356 | |
357 | /** |
358 | * enum req_op - Operations common to the bio and request structures. |
359 | * We use 8 bits for encoding the operation, and the remaining 24 for flags. |
360 | * |
361 | * The least significant bit of the operation number indicates the data |
362 | * transfer direction: |
363 | * |
364 | * - if the least significant bit is set transfers are TO the device |
365 | * - if the least significant bit is not set transfers are FROM the device |
366 | * |
367 | * If a operation does not transfer data the least significant bit has no |
368 | * meaning. |
369 | */ |
370 | enum req_op { |
371 | /* read sectors from the device */ |
372 | REQ_OP_READ = (__force blk_opf_t)0, |
373 | /* write sectors to the device */ |
374 | REQ_OP_WRITE = (__force blk_opf_t)1, |
375 | /* flush the volatile write cache */ |
376 | REQ_OP_FLUSH = (__force blk_opf_t)2, |
377 | /* discard sectors */ |
378 | REQ_OP_DISCARD = (__force blk_opf_t)3, |
379 | /* securely erase sectors */ |
380 | REQ_OP_SECURE_ERASE = (__force blk_opf_t)5, |
381 | /* write the zero filled sector many times */ |
382 | REQ_OP_WRITE_ZEROES = (__force blk_opf_t)9, |
383 | /* Open a zone */ |
384 | REQ_OP_ZONE_OPEN = (__force blk_opf_t)10, |
385 | /* Close a zone */ |
386 | REQ_OP_ZONE_CLOSE = (__force blk_opf_t)11, |
387 | /* Transition a zone to full */ |
388 | REQ_OP_ZONE_FINISH = (__force blk_opf_t)12, |
389 | /* write data at the current zone write pointer */ |
390 | REQ_OP_ZONE_APPEND = (__force blk_opf_t)13, |
391 | /* reset a zone write pointer */ |
392 | REQ_OP_ZONE_RESET = (__force blk_opf_t)15, |
393 | /* reset all the zone present on the device */ |
394 | REQ_OP_ZONE_RESET_ALL = (__force blk_opf_t)17, |
395 | |
396 | /* Driver private requests */ |
397 | REQ_OP_DRV_IN = (__force blk_opf_t)34, |
398 | REQ_OP_DRV_OUT = (__force blk_opf_t)35, |
399 | |
400 | REQ_OP_LAST = (__force blk_opf_t)36, |
401 | }; |
402 | |
403 | enum req_flag_bits { |
404 | __REQ_FAILFAST_DEV = /* no driver retries of device errors */ |
405 | REQ_OP_BITS, |
406 | __REQ_FAILFAST_TRANSPORT, /* no driver retries of transport errors */ |
407 | __REQ_FAILFAST_DRIVER, /* no driver retries of driver errors */ |
408 | __REQ_SYNC, /* request is sync (sync write or read) */ |
409 | __REQ_META, /* metadata io request */ |
410 | __REQ_PRIO, /* boost priority in cfq */ |
411 | __REQ_NOMERGE, /* don't touch this for merging */ |
412 | __REQ_IDLE, /* anticipate more IO after this one */ |
413 | __REQ_INTEGRITY, /* I/O includes block integrity payload */ |
414 | __REQ_FUA, /* forced unit access */ |
415 | __REQ_PREFLUSH, /* request for cache flush */ |
416 | __REQ_RAHEAD, /* read ahead, can fail anytime */ |
417 | __REQ_BACKGROUND, /* background IO */ |
418 | __REQ_NOWAIT, /* Don't wait if request will block */ |
419 | __REQ_POLLED, /* caller polls for completion using bio_poll */ |
420 | __REQ_ALLOC_CACHE, /* allocate IO from cache if available */ |
421 | __REQ_SWAP, /* swap I/O */ |
422 | __REQ_DRV, /* for driver use */ |
423 | __REQ_FS_PRIVATE, /* for file system (submitter) use */ |
424 | |
425 | /* |
426 | * Command specific flags, keep last: |
427 | */ |
428 | /* for REQ_OP_WRITE_ZEROES: */ |
429 | __REQ_NOUNMAP, /* do not free blocks when zeroing */ |
430 | |
431 | __REQ_NR_BITS, /* stops here */ |
432 | }; |
433 | |
434 | #define REQ_FAILFAST_DEV \ |
435 | (__force blk_opf_t)(1ULL << __REQ_FAILFAST_DEV) |
436 | #define REQ_FAILFAST_TRANSPORT \ |
437 | (__force blk_opf_t)(1ULL << __REQ_FAILFAST_TRANSPORT) |
438 | #define REQ_FAILFAST_DRIVER \ |
439 | (__force blk_opf_t)(1ULL << __REQ_FAILFAST_DRIVER) |
440 | #define REQ_SYNC (__force blk_opf_t)(1ULL << __REQ_SYNC) |
441 | #define REQ_META (__force blk_opf_t)(1ULL << __REQ_META) |
442 | #define REQ_PRIO (__force blk_opf_t)(1ULL << __REQ_PRIO) |
443 | #define REQ_NOMERGE (__force blk_opf_t)(1ULL << __REQ_NOMERGE) |
444 | #define REQ_IDLE (__force blk_opf_t)(1ULL << __REQ_IDLE) |
445 | #define REQ_INTEGRITY (__force blk_opf_t)(1ULL << __REQ_INTEGRITY) |
446 | #define REQ_FUA (__force blk_opf_t)(1ULL << __REQ_FUA) |
447 | #define REQ_PREFLUSH (__force blk_opf_t)(1ULL << __REQ_PREFLUSH) |
448 | #define REQ_RAHEAD (__force blk_opf_t)(1ULL << __REQ_RAHEAD) |
449 | #define REQ_BACKGROUND (__force blk_opf_t)(1ULL << __REQ_BACKGROUND) |
450 | #define REQ_NOWAIT (__force blk_opf_t)(1ULL << __REQ_NOWAIT) |
451 | #define REQ_POLLED (__force blk_opf_t)(1ULL << __REQ_POLLED) |
452 | #define REQ_ALLOC_CACHE (__force blk_opf_t)(1ULL << __REQ_ALLOC_CACHE) |
453 | #define REQ_SWAP (__force blk_opf_t)(1ULL << __REQ_SWAP) |
454 | #define REQ_DRV (__force blk_opf_t)(1ULL << __REQ_DRV) |
455 | #define REQ_FS_PRIVATE (__force blk_opf_t)(1ULL << __REQ_FS_PRIVATE) |
456 | |
457 | #define REQ_NOUNMAP (__force blk_opf_t)(1ULL << __REQ_NOUNMAP) |
458 | |
459 | #define REQ_FAILFAST_MASK \ |
460 | (REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT | REQ_FAILFAST_DRIVER) |
461 | |
462 | #define REQ_NOMERGE_FLAGS \ |
463 | (REQ_NOMERGE | REQ_PREFLUSH | REQ_FUA) |
464 | |
465 | enum stat_group { |
466 | STAT_READ, |
467 | STAT_WRITE, |
468 | STAT_DISCARD, |
469 | STAT_FLUSH, |
470 | |
471 | NR_STAT_GROUPS |
472 | }; |
473 | |
474 | static inline enum req_op bio_op(const struct bio *bio) |
475 | { |
476 | return bio->bi_opf & REQ_OP_MASK; |
477 | } |
478 | |
479 | static inline bool op_is_write(blk_opf_t op) |
480 | { |
481 | return !!(op & (__force blk_opf_t)1); |
482 | } |
483 | |
484 | /* |
485 | * Check if the bio or request is one that needs special treatment in the |
486 | * flush state machine. |
487 | */ |
488 | static inline bool op_is_flush(blk_opf_t op) |
489 | { |
490 | return op & (REQ_FUA | REQ_PREFLUSH); |
491 | } |
492 | |
493 | /* |
494 | * Reads are always treated as synchronous, as are requests with the FUA or |
495 | * PREFLUSH flag. Other operations may be marked as synchronous using the |
496 | * REQ_SYNC flag. |
497 | */ |
498 | static inline bool op_is_sync(blk_opf_t op) |
499 | { |
500 | return (op & REQ_OP_MASK) == REQ_OP_READ || |
501 | (op & (REQ_SYNC | REQ_FUA | REQ_PREFLUSH)); |
502 | } |
503 | |
504 | static inline bool op_is_discard(blk_opf_t op) |
505 | { |
506 | return (op & REQ_OP_MASK) == REQ_OP_DISCARD; |
507 | } |
508 | |
509 | /* |
510 | * Check if a bio or request operation is a zone management operation, with |
511 | * the exception of REQ_OP_ZONE_RESET_ALL which is treated as a special case |
512 | * due to its different handling in the block layer and device response in |
513 | * case of command failure. |
514 | */ |
515 | static inline bool op_is_zone_mgmt(enum req_op op) |
516 | { |
517 | switch (op & REQ_OP_MASK) { |
518 | case REQ_OP_ZONE_RESET: |
519 | case REQ_OP_ZONE_OPEN: |
520 | case REQ_OP_ZONE_CLOSE: |
521 | case REQ_OP_ZONE_FINISH: |
522 | return true; |
523 | default: |
524 | return false; |
525 | } |
526 | } |
527 | |
528 | static inline int op_stat_group(enum req_op op) |
529 | { |
530 | if (op_is_discard(op)) |
531 | return STAT_DISCARD; |
532 | return op_is_write(op); |
533 | } |
534 | |
535 | struct blk_rq_stat { |
536 | u64 mean; |
537 | u64 min; |
538 | u64 max; |
539 | u32 nr_samples; |
540 | u64 batch; |
541 | }; |
542 | |
543 | #endif /* __LINUX_BLK_TYPES_H */ |
544 | |