Commit | Line | Data |
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3dcf60bc | 1 | // SPDX-License-Identifier: GPL-2.0 |
86db1e29 JA |
2 | /* |
3 | * Functions related to setting various queue properties from drivers | |
4 | */ | |
5 | #include <linux/kernel.h> | |
6 | #include <linux/module.h> | |
7 | #include <linux/init.h> | |
8 | #include <linux/bio.h> | |
9 | #include <linux/blkdev.h> | |
4ee60ec1 | 10 | #include <linux/pagemap.h> |
edb0872f | 11 | #include <linux/backing-dev-defs.h> |
70dd5bf3 | 12 | #include <linux/gcd.h> |
2cda2728 | 13 | #include <linux/lcm.h> |
ad5ebd2f | 14 | #include <linux/jiffies.h> |
5a0e3ad6 | 15 | #include <linux/gfp.h> |
45147fb5 | 16 | #include <linux/dma-mapping.h> |
86db1e29 JA |
17 | |
18 | #include "blk.h" | |
0bc65bd4 | 19 | #include "blk-rq-qos.h" |
87760e5e | 20 | #include "blk-wbt.h" |
86db1e29 | 21 | |
242f9dcb JA |
22 | void blk_queue_rq_timeout(struct request_queue *q, unsigned int timeout) |
23 | { | |
24 | q->rq_timeout = timeout; | |
25 | } | |
26 | EXPORT_SYMBOL_GPL(blk_queue_rq_timeout); | |
27 | ||
e475bba2 MP |
28 | /** |
29 | * blk_set_default_limits - reset limits to default values | |
f740f5ca | 30 | * @lim: the queue_limits structure to reset |
e475bba2 MP |
31 | * |
32 | * Description: | |
b1bd055d | 33 | * Returns a queue_limit struct to its default state. |
e475bba2 MP |
34 | */ |
35 | void blk_set_default_limits(struct queue_limits *lim) | |
36 | { | |
8a78362c | 37 | lim->max_segments = BLK_MAX_SEGMENTS; |
1e739730 | 38 | lim->max_discard_segments = 1; |
13f05c8d | 39 | lim->max_integrity_segments = 0; |
e475bba2 | 40 | lim->seg_boundary_mask = BLK_SEG_BOUNDARY_MASK; |
03100aad | 41 | lim->virt_boundary_mask = 0; |
eb28d31b | 42 | lim->max_segment_size = BLK_MAX_SEGMENT_SIZE; |
5f009d3f | 43 | lim->max_sectors = lim->max_hw_sectors = BLK_SAFE_MAX_SECTORS; |
c9c77418 | 44 | lim->max_user_sectors = lim->max_dev_sectors = 0; |
762380ad | 45 | lim->chunk_sectors = 0; |
a6f0788e | 46 | lim->max_write_zeroes_sectors = 0; |
0512a75b | 47 | lim->max_zone_append_sectors = 0; |
86b37281 | 48 | lim->max_discard_sectors = 0; |
0034af03 | 49 | lim->max_hw_discard_sectors = 0; |
44abff2c | 50 | lim->max_secure_erase_sectors = 0; |
86b37281 MP |
51 | lim->discard_granularity = 0; |
52 | lim->discard_alignment = 0; | |
53 | lim->discard_misaligned = 0; | |
e475bba2 | 54 | lim->logical_block_size = lim->physical_block_size = lim->io_min = 512; |
9bb33f24 | 55 | lim->bounce = BLK_BOUNCE_NONE; |
e475bba2 MP |
56 | lim->alignment_offset = 0; |
57 | lim->io_opt = 0; | |
58 | lim->misaligned = 0; | |
797476b8 | 59 | lim->zoned = BLK_ZONED_NONE; |
a805a4fa | 60 | lim->zone_write_granularity = 0; |
c964d62f | 61 | lim->dma_alignment = 511; |
e475bba2 | 62 | } |
e475bba2 | 63 | |
b1bd055d MP |
64 | /** |
65 | * blk_set_stacking_limits - set default limits for stacking devices | |
66 | * @lim: the queue_limits structure to reset | |
67 | * | |
68 | * Description: | |
69 | * Returns a queue_limit struct to its default state. Should be used | |
70 | * by stacking drivers like DM that have no internal limits. | |
71 | */ | |
72 | void blk_set_stacking_limits(struct queue_limits *lim) | |
73 | { | |
74 | blk_set_default_limits(lim); | |
75 | ||
76 | /* Inherit limits from component devices */ | |
b1bd055d | 77 | lim->max_segments = USHRT_MAX; |
42c9cdfe | 78 | lim->max_discard_segments = USHRT_MAX; |
b1bd055d | 79 | lim->max_hw_sectors = UINT_MAX; |
d82ae52e | 80 | lim->max_segment_size = UINT_MAX; |
fe86cdce | 81 | lim->max_sectors = UINT_MAX; |
ca369d51 | 82 | lim->max_dev_sectors = UINT_MAX; |
a6f0788e | 83 | lim->max_write_zeroes_sectors = UINT_MAX; |
0512a75b | 84 | lim->max_zone_append_sectors = UINT_MAX; |
b1bd055d MP |
85 | } |
86 | EXPORT_SYMBOL(blk_set_stacking_limits); | |
87 | ||
86db1e29 JA |
88 | /** |
89 | * blk_queue_bounce_limit - set bounce buffer limit for queue | |
cd0aca2d | 90 | * @q: the request queue for the device |
9bb33f24 | 91 | * @bounce: bounce limit to enforce |
86db1e29 JA |
92 | * |
93 | * Description: | |
9bb33f24 CH |
94 | * Force bouncing for ISA DMA ranges or highmem. |
95 | * | |
96 | * DEPRECATED, don't use in new code. | |
86db1e29 | 97 | **/ |
9bb33f24 | 98 | void blk_queue_bounce_limit(struct request_queue *q, enum blk_bounce bounce) |
86db1e29 | 99 | { |
9bb33f24 | 100 | q->limits.bounce = bounce; |
86db1e29 | 101 | } |
86db1e29 JA |
102 | EXPORT_SYMBOL(blk_queue_bounce_limit); |
103 | ||
104 | /** | |
ca369d51 MP |
105 | * blk_queue_max_hw_sectors - set max sectors for a request for this queue |
106 | * @q: the request queue for the device | |
2800aac1 | 107 | * @max_hw_sectors: max hardware sectors in the usual 512b unit |
86db1e29 JA |
108 | * |
109 | * Description: | |
2800aac1 MP |
110 | * Enables a low level driver to set a hard upper limit, |
111 | * max_hw_sectors, on the size of requests. max_hw_sectors is set by | |
4f258a46 MP |
112 | * the device driver based upon the capabilities of the I/O |
113 | * controller. | |
2800aac1 | 114 | * |
ca369d51 MP |
115 | * max_dev_sectors is a hard limit imposed by the storage device for |
116 | * READ/WRITE requests. It is set by the disk driver. | |
117 | * | |
2800aac1 MP |
118 | * max_sectors is a soft limit imposed by the block layer for |
119 | * filesystem type requests. This value can be overridden on a | |
120 | * per-device basis in /sys/block/<device>/queue/max_sectors_kb. | |
121 | * The soft limit can not exceed max_hw_sectors. | |
86db1e29 | 122 | **/ |
ca369d51 | 123 | void blk_queue_max_hw_sectors(struct request_queue *q, unsigned int max_hw_sectors) |
86db1e29 | 124 | { |
ca369d51 MP |
125 | struct queue_limits *limits = &q->limits; |
126 | unsigned int max_sectors; | |
127 | ||
09cbfeaf KS |
128 | if ((max_hw_sectors << 9) < PAGE_SIZE) { |
129 | max_hw_sectors = 1 << (PAGE_SHIFT - 9); | |
24c03d47 | 130 | printk(KERN_INFO "%s: set to minimum %d\n", |
2800aac1 | 131 | __func__, max_hw_sectors); |
86db1e29 JA |
132 | } |
133 | ||
817046ec DLM |
134 | max_hw_sectors = round_down(max_hw_sectors, |
135 | limits->logical_block_size >> SECTOR_SHIFT); | |
30e2bc08 | 136 | limits->max_hw_sectors = max_hw_sectors; |
817046ec | 137 | |
ca369d51 | 138 | max_sectors = min_not_zero(max_hw_sectors, limits->max_dev_sectors); |
c9c77418 KB |
139 | |
140 | if (limits->max_user_sectors) | |
141 | max_sectors = min(max_sectors, limits->max_user_sectors); | |
142 | else | |
143 | max_sectors = min(max_sectors, BLK_DEF_MAX_SECTORS); | |
144 | ||
817046ec DLM |
145 | max_sectors = round_down(max_sectors, |
146 | limits->logical_block_size >> SECTOR_SHIFT); | |
ca369d51 | 147 | limits->max_sectors = max_sectors; |
817046ec | 148 | |
d152c682 | 149 | if (!q->disk) |
edb0872f | 150 | return; |
d152c682 | 151 | q->disk->bdi->io_pages = max_sectors >> (PAGE_SHIFT - 9); |
86db1e29 | 152 | } |
086fa5ff | 153 | EXPORT_SYMBOL(blk_queue_max_hw_sectors); |
86db1e29 | 154 | |
762380ad JA |
155 | /** |
156 | * blk_queue_chunk_sectors - set size of the chunk for this queue | |
157 | * @q: the request queue for the device | |
158 | * @chunk_sectors: chunk sectors in the usual 512b unit | |
159 | * | |
160 | * Description: | |
161 | * If a driver doesn't want IOs to cross a given chunk size, it can set | |
07d098e6 MS |
162 | * this limit and prevent merging across chunks. Note that the block layer |
163 | * must accept a page worth of data at any offset. So if the crossing of | |
164 | * chunks is a hard limitation in the driver, it must still be prepared | |
165 | * to split single page bios. | |
762380ad JA |
166 | **/ |
167 | void blk_queue_chunk_sectors(struct request_queue *q, unsigned int chunk_sectors) | |
168 | { | |
762380ad JA |
169 | q->limits.chunk_sectors = chunk_sectors; |
170 | } | |
171 | EXPORT_SYMBOL(blk_queue_chunk_sectors); | |
172 | ||
67efc925 CH |
173 | /** |
174 | * blk_queue_max_discard_sectors - set max sectors for a single discard | |
175 | * @q: the request queue for the device | |
c7ebf065 | 176 | * @max_discard_sectors: maximum number of sectors to discard |
67efc925 CH |
177 | **/ |
178 | void blk_queue_max_discard_sectors(struct request_queue *q, | |
179 | unsigned int max_discard_sectors) | |
180 | { | |
0034af03 | 181 | q->limits.max_hw_discard_sectors = max_discard_sectors; |
67efc925 CH |
182 | q->limits.max_discard_sectors = max_discard_sectors; |
183 | } | |
184 | EXPORT_SYMBOL(blk_queue_max_discard_sectors); | |
185 | ||
44abff2c CH |
186 | /** |
187 | * blk_queue_max_secure_erase_sectors - set max sectors for a secure erase | |
188 | * @q: the request queue for the device | |
189 | * @max_sectors: maximum number of sectors to secure_erase | |
190 | **/ | |
191 | void blk_queue_max_secure_erase_sectors(struct request_queue *q, | |
192 | unsigned int max_sectors) | |
193 | { | |
194 | q->limits.max_secure_erase_sectors = max_sectors; | |
195 | } | |
196 | EXPORT_SYMBOL(blk_queue_max_secure_erase_sectors); | |
197 | ||
a6f0788e CK |
198 | /** |
199 | * blk_queue_max_write_zeroes_sectors - set max sectors for a single | |
200 | * write zeroes | |
201 | * @q: the request queue for the device | |
202 | * @max_write_zeroes_sectors: maximum number of sectors to write per command | |
203 | **/ | |
204 | void blk_queue_max_write_zeroes_sectors(struct request_queue *q, | |
205 | unsigned int max_write_zeroes_sectors) | |
206 | { | |
207 | q->limits.max_write_zeroes_sectors = max_write_zeroes_sectors; | |
208 | } | |
209 | EXPORT_SYMBOL(blk_queue_max_write_zeroes_sectors); | |
210 | ||
0512a75b KB |
211 | /** |
212 | * blk_queue_max_zone_append_sectors - set max sectors for a single zone append | |
213 | * @q: the request queue for the device | |
214 | * @max_zone_append_sectors: maximum number of sectors to write per command | |
215 | **/ | |
216 | void blk_queue_max_zone_append_sectors(struct request_queue *q, | |
217 | unsigned int max_zone_append_sectors) | |
218 | { | |
219 | unsigned int max_sectors; | |
220 | ||
221 | if (WARN_ON(!blk_queue_is_zoned(q))) | |
222 | return; | |
223 | ||
224 | max_sectors = min(q->limits.max_hw_sectors, max_zone_append_sectors); | |
225 | max_sectors = min(q->limits.chunk_sectors, max_sectors); | |
226 | ||
227 | /* | |
228 | * Signal eventual driver bugs resulting in the max_zone_append sectors limit | |
229 | * being 0 due to a 0 argument, the chunk_sectors limit (zone size) not set, | |
230 | * or the max_hw_sectors limit not set. | |
231 | */ | |
232 | WARN_ON(!max_sectors); | |
233 | ||
234 | q->limits.max_zone_append_sectors = max_sectors; | |
235 | } | |
236 | EXPORT_SYMBOL_GPL(blk_queue_max_zone_append_sectors); | |
237 | ||
86db1e29 | 238 | /** |
8a78362c | 239 | * blk_queue_max_segments - set max hw segments for a request for this queue |
86db1e29 JA |
240 | * @q: the request queue for the device |
241 | * @max_segments: max number of segments | |
242 | * | |
243 | * Description: | |
244 | * Enables a low level driver to set an upper limit on the number of | |
8a78362c | 245 | * hw data segments in a request. |
86db1e29 | 246 | **/ |
8a78362c | 247 | void blk_queue_max_segments(struct request_queue *q, unsigned short max_segments) |
86db1e29 JA |
248 | { |
249 | if (!max_segments) { | |
250 | max_segments = 1; | |
24c03d47 HH |
251 | printk(KERN_INFO "%s: set to minimum %d\n", |
252 | __func__, max_segments); | |
86db1e29 JA |
253 | } |
254 | ||
8a78362c | 255 | q->limits.max_segments = max_segments; |
86db1e29 | 256 | } |
8a78362c | 257 | EXPORT_SYMBOL(blk_queue_max_segments); |
86db1e29 | 258 | |
1e739730 CH |
259 | /** |
260 | * blk_queue_max_discard_segments - set max segments for discard requests | |
261 | * @q: the request queue for the device | |
262 | * @max_segments: max number of segments | |
263 | * | |
264 | * Description: | |
265 | * Enables a low level driver to set an upper limit on the number of | |
266 | * segments in a discard request. | |
267 | **/ | |
268 | void blk_queue_max_discard_segments(struct request_queue *q, | |
269 | unsigned short max_segments) | |
270 | { | |
271 | q->limits.max_discard_segments = max_segments; | |
272 | } | |
273 | EXPORT_SYMBOL_GPL(blk_queue_max_discard_segments); | |
274 | ||
86db1e29 JA |
275 | /** |
276 | * blk_queue_max_segment_size - set max segment size for blk_rq_map_sg | |
277 | * @q: the request queue for the device | |
278 | * @max_size: max size of segment in bytes | |
279 | * | |
280 | * Description: | |
281 | * Enables a low level driver to set an upper limit on the size of a | |
282 | * coalesced segment | |
283 | **/ | |
284 | void blk_queue_max_segment_size(struct request_queue *q, unsigned int max_size) | |
285 | { | |
09cbfeaf KS |
286 | if (max_size < PAGE_SIZE) { |
287 | max_size = PAGE_SIZE; | |
24c03d47 HH |
288 | printk(KERN_INFO "%s: set to minimum %d\n", |
289 | __func__, max_size); | |
86db1e29 JA |
290 | } |
291 | ||
09324d32 CH |
292 | /* see blk_queue_virt_boundary() for the explanation */ |
293 | WARN_ON_ONCE(q->limits.virt_boundary_mask); | |
294 | ||
025146e1 | 295 | q->limits.max_segment_size = max_size; |
86db1e29 | 296 | } |
86db1e29 JA |
297 | EXPORT_SYMBOL(blk_queue_max_segment_size); |
298 | ||
299 | /** | |
e1defc4f | 300 | * blk_queue_logical_block_size - set logical block size for the queue |
86db1e29 | 301 | * @q: the request queue for the device |
e1defc4f | 302 | * @size: the logical block size, in bytes |
86db1e29 JA |
303 | * |
304 | * Description: | |
e1defc4f MP |
305 | * This should be set to the lowest possible block size that the |
306 | * storage device can address. The default of 512 covers most | |
307 | * hardware. | |
86db1e29 | 308 | **/ |
ad6bf88a | 309 | void blk_queue_logical_block_size(struct request_queue *q, unsigned int size) |
86db1e29 | 310 | { |
817046ec DLM |
311 | struct queue_limits *limits = &q->limits; |
312 | ||
313 | limits->logical_block_size = size; | |
314 | ||
315 | if (limits->physical_block_size < size) | |
316 | limits->physical_block_size = size; | |
c72758f3 | 317 | |
817046ec DLM |
318 | if (limits->io_min < limits->physical_block_size) |
319 | limits->io_min = limits->physical_block_size; | |
c72758f3 | 320 | |
817046ec DLM |
321 | limits->max_hw_sectors = |
322 | round_down(limits->max_hw_sectors, size >> SECTOR_SHIFT); | |
323 | limits->max_sectors = | |
324 | round_down(limits->max_sectors, size >> SECTOR_SHIFT); | |
86db1e29 | 325 | } |
e1defc4f | 326 | EXPORT_SYMBOL(blk_queue_logical_block_size); |
86db1e29 | 327 | |
c72758f3 MP |
328 | /** |
329 | * blk_queue_physical_block_size - set physical block size for the queue | |
330 | * @q: the request queue for the device | |
331 | * @size: the physical block size, in bytes | |
332 | * | |
333 | * Description: | |
334 | * This should be set to the lowest possible sector size that the | |
335 | * hardware can operate on without reverting to read-modify-write | |
336 | * operations. | |
337 | */ | |
892b6f90 | 338 | void blk_queue_physical_block_size(struct request_queue *q, unsigned int size) |
c72758f3 MP |
339 | { |
340 | q->limits.physical_block_size = size; | |
341 | ||
342 | if (q->limits.physical_block_size < q->limits.logical_block_size) | |
343 | q->limits.physical_block_size = q->limits.logical_block_size; | |
344 | ||
345 | if (q->limits.io_min < q->limits.physical_block_size) | |
346 | q->limits.io_min = q->limits.physical_block_size; | |
347 | } | |
348 | EXPORT_SYMBOL(blk_queue_physical_block_size); | |
349 | ||
a805a4fa DLM |
350 | /** |
351 | * blk_queue_zone_write_granularity - set zone write granularity for the queue | |
352 | * @q: the request queue for the zoned device | |
353 | * @size: the zone write granularity size, in bytes | |
354 | * | |
355 | * Description: | |
356 | * This should be set to the lowest possible size allowing to write in | |
357 | * sequential zones of a zoned block device. | |
358 | */ | |
359 | void blk_queue_zone_write_granularity(struct request_queue *q, | |
360 | unsigned int size) | |
361 | { | |
362 | if (WARN_ON_ONCE(!blk_queue_is_zoned(q))) | |
363 | return; | |
364 | ||
365 | q->limits.zone_write_granularity = size; | |
366 | ||
367 | if (q->limits.zone_write_granularity < q->limits.logical_block_size) | |
368 | q->limits.zone_write_granularity = q->limits.logical_block_size; | |
369 | } | |
370 | EXPORT_SYMBOL_GPL(blk_queue_zone_write_granularity); | |
371 | ||
c72758f3 MP |
372 | /** |
373 | * blk_queue_alignment_offset - set physical block alignment offset | |
374 | * @q: the request queue for the device | |
8ebf9756 | 375 | * @offset: alignment offset in bytes |
c72758f3 MP |
376 | * |
377 | * Description: | |
378 | * Some devices are naturally misaligned to compensate for things like | |
379 | * the legacy DOS partition table 63-sector offset. Low-level drivers | |
380 | * should call this function for devices whose first sector is not | |
381 | * naturally aligned. | |
382 | */ | |
383 | void blk_queue_alignment_offset(struct request_queue *q, unsigned int offset) | |
384 | { | |
385 | q->limits.alignment_offset = | |
386 | offset & (q->limits.physical_block_size - 1); | |
387 | q->limits.misaligned = 0; | |
388 | } | |
389 | EXPORT_SYMBOL(blk_queue_alignment_offset); | |
390 | ||
471aa704 | 391 | void disk_update_readahead(struct gendisk *disk) |
c2e4cd57 | 392 | { |
471aa704 CH |
393 | struct request_queue *q = disk->queue; |
394 | ||
c2e4cd57 CH |
395 | /* |
396 | * For read-ahead of large files to be effective, we need to read ahead | |
397 | * at least twice the optimal I/O size. | |
398 | */ | |
edb0872f | 399 | disk->bdi->ra_pages = |
c2e4cd57 | 400 | max(queue_io_opt(q) * 2 / PAGE_SIZE, VM_READAHEAD_PAGES); |
edb0872f | 401 | disk->bdi->io_pages = queue_max_sectors(q) >> (PAGE_SHIFT - 9); |
c2e4cd57 | 402 | } |
471aa704 | 403 | EXPORT_SYMBOL_GPL(disk_update_readahead); |
c2e4cd57 | 404 | |
7c958e32 MP |
405 | /** |
406 | * blk_limits_io_min - set minimum request size for a device | |
407 | * @limits: the queue limits | |
408 | * @min: smallest I/O size in bytes | |
409 | * | |
410 | * Description: | |
411 | * Some devices have an internal block size bigger than the reported | |
412 | * hardware sector size. This function can be used to signal the | |
413 | * smallest I/O the device can perform without incurring a performance | |
414 | * penalty. | |
415 | */ | |
416 | void blk_limits_io_min(struct queue_limits *limits, unsigned int min) | |
417 | { | |
418 | limits->io_min = min; | |
419 | ||
420 | if (limits->io_min < limits->logical_block_size) | |
421 | limits->io_min = limits->logical_block_size; | |
422 | ||
423 | if (limits->io_min < limits->physical_block_size) | |
424 | limits->io_min = limits->physical_block_size; | |
425 | } | |
426 | EXPORT_SYMBOL(blk_limits_io_min); | |
427 | ||
c72758f3 MP |
428 | /** |
429 | * blk_queue_io_min - set minimum request size for the queue | |
430 | * @q: the request queue for the device | |
8ebf9756 | 431 | * @min: smallest I/O size in bytes |
c72758f3 MP |
432 | * |
433 | * Description: | |
7e5f5fb0 MP |
434 | * Storage devices may report a granularity or preferred minimum I/O |
435 | * size which is the smallest request the device can perform without | |
436 | * incurring a performance penalty. For disk drives this is often the | |
437 | * physical block size. For RAID arrays it is often the stripe chunk | |
438 | * size. A properly aligned multiple of minimum_io_size is the | |
439 | * preferred request size for workloads where a high number of I/O | |
440 | * operations is desired. | |
c72758f3 MP |
441 | */ |
442 | void blk_queue_io_min(struct request_queue *q, unsigned int min) | |
443 | { | |
7c958e32 | 444 | blk_limits_io_min(&q->limits, min); |
c72758f3 MP |
445 | } |
446 | EXPORT_SYMBOL(blk_queue_io_min); | |
447 | ||
3c5820c7 MP |
448 | /** |
449 | * blk_limits_io_opt - set optimal request size for a device | |
450 | * @limits: the queue limits | |
451 | * @opt: smallest I/O size in bytes | |
452 | * | |
453 | * Description: | |
454 | * Storage devices may report an optimal I/O size, which is the | |
455 | * device's preferred unit for sustained I/O. This is rarely reported | |
456 | * for disk drives. For RAID arrays it is usually the stripe width or | |
457 | * the internal track size. A properly aligned multiple of | |
458 | * optimal_io_size is the preferred request size for workloads where | |
459 | * sustained throughput is desired. | |
460 | */ | |
461 | void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt) | |
462 | { | |
463 | limits->io_opt = opt; | |
464 | } | |
465 | EXPORT_SYMBOL(blk_limits_io_opt); | |
466 | ||
c72758f3 MP |
467 | /** |
468 | * blk_queue_io_opt - set optimal request size for the queue | |
469 | * @q: the request queue for the device | |
8ebf9756 | 470 | * @opt: optimal request size in bytes |
c72758f3 MP |
471 | * |
472 | * Description: | |
7e5f5fb0 MP |
473 | * Storage devices may report an optimal I/O size, which is the |
474 | * device's preferred unit for sustained I/O. This is rarely reported | |
475 | * for disk drives. For RAID arrays it is usually the stripe width or | |
476 | * the internal track size. A properly aligned multiple of | |
477 | * optimal_io_size is the preferred request size for workloads where | |
478 | * sustained throughput is desired. | |
c72758f3 MP |
479 | */ |
480 | void blk_queue_io_opt(struct request_queue *q, unsigned int opt) | |
481 | { | |
3c5820c7 | 482 | blk_limits_io_opt(&q->limits, opt); |
d152c682 | 483 | if (!q->disk) |
edb0872f | 484 | return; |
d152c682 | 485 | q->disk->bdi->ra_pages = |
c2e4cd57 | 486 | max(queue_io_opt(q) * 2 / PAGE_SIZE, VM_READAHEAD_PAGES); |
c72758f3 MP |
487 | } |
488 | EXPORT_SYMBOL(blk_queue_io_opt); | |
489 | ||
aa261f20 | 490 | static int queue_limit_alignment_offset(const struct queue_limits *lim, |
89098b07 CH |
491 | sector_t sector) |
492 | { | |
493 | unsigned int granularity = max(lim->physical_block_size, lim->io_min); | |
494 | unsigned int alignment = sector_div(sector, granularity >> SECTOR_SHIFT) | |
495 | << SECTOR_SHIFT; | |
496 | ||
497 | return (granularity + lim->alignment_offset - alignment) % granularity; | |
498 | } | |
499 | ||
aa261f20 BVA |
500 | static unsigned int queue_limit_discard_alignment( |
501 | const struct queue_limits *lim, sector_t sector) | |
5c4b4a5c CH |
502 | { |
503 | unsigned int alignment, granularity, offset; | |
504 | ||
505 | if (!lim->max_discard_sectors) | |
506 | return 0; | |
507 | ||
508 | /* Why are these in bytes, not sectors? */ | |
509 | alignment = lim->discard_alignment >> SECTOR_SHIFT; | |
510 | granularity = lim->discard_granularity >> SECTOR_SHIFT; | |
511 | if (!granularity) | |
512 | return 0; | |
513 | ||
514 | /* Offset of the partition start in 'granularity' sectors */ | |
515 | offset = sector_div(sector, granularity); | |
516 | ||
517 | /* And why do we do this modulus *again* in blkdev_issue_discard()? */ | |
518 | offset = (granularity + alignment - offset) % granularity; | |
519 | ||
520 | /* Turn it back into bytes, gaah */ | |
521 | return offset << SECTOR_SHIFT; | |
522 | } | |
523 | ||
97f433c3 MP |
524 | static unsigned int blk_round_down_sectors(unsigned int sectors, unsigned int lbs) |
525 | { | |
526 | sectors = round_down(sectors, lbs >> SECTOR_SHIFT); | |
527 | if (sectors < PAGE_SIZE >> SECTOR_SHIFT) | |
528 | sectors = PAGE_SIZE >> SECTOR_SHIFT; | |
529 | return sectors; | |
530 | } | |
531 | ||
c72758f3 MP |
532 | /** |
533 | * blk_stack_limits - adjust queue_limits for stacked devices | |
81744ee4 MP |
534 | * @t: the stacking driver limits (top device) |
535 | * @b: the underlying queue limits (bottom, component device) | |
e03a72e1 | 536 | * @start: first data sector within component device |
c72758f3 MP |
537 | * |
538 | * Description: | |
81744ee4 MP |
539 | * This function is used by stacking drivers like MD and DM to ensure |
540 | * that all component devices have compatible block sizes and | |
541 | * alignments. The stacking driver must provide a queue_limits | |
542 | * struct (top) and then iteratively call the stacking function for | |
543 | * all component (bottom) devices. The stacking function will | |
544 | * attempt to combine the values and ensure proper alignment. | |
545 | * | |
546 | * Returns 0 if the top and bottom queue_limits are compatible. The | |
547 | * top device's block sizes and alignment offsets may be adjusted to | |
548 | * ensure alignment with the bottom device. If no compatible sizes | |
549 | * and alignments exist, -1 is returned and the resulting top | |
550 | * queue_limits will have the misaligned flag set to indicate that | |
551 | * the alignment_offset is undefined. | |
c72758f3 MP |
552 | */ |
553 | int blk_stack_limits(struct queue_limits *t, struct queue_limits *b, | |
e03a72e1 | 554 | sector_t start) |
c72758f3 | 555 | { |
e03a72e1 | 556 | unsigned int top, bottom, alignment, ret = 0; |
86b37281 | 557 | |
c72758f3 MP |
558 | t->max_sectors = min_not_zero(t->max_sectors, b->max_sectors); |
559 | t->max_hw_sectors = min_not_zero(t->max_hw_sectors, b->max_hw_sectors); | |
ca369d51 | 560 | t->max_dev_sectors = min_not_zero(t->max_dev_sectors, b->max_dev_sectors); |
a6f0788e CK |
561 | t->max_write_zeroes_sectors = min(t->max_write_zeroes_sectors, |
562 | b->max_write_zeroes_sectors); | |
0512a75b KB |
563 | t->max_zone_append_sectors = min(t->max_zone_append_sectors, |
564 | b->max_zone_append_sectors); | |
9bb33f24 | 565 | t->bounce = max(t->bounce, b->bounce); |
c72758f3 MP |
566 | |
567 | t->seg_boundary_mask = min_not_zero(t->seg_boundary_mask, | |
568 | b->seg_boundary_mask); | |
03100aad KB |
569 | t->virt_boundary_mask = min_not_zero(t->virt_boundary_mask, |
570 | b->virt_boundary_mask); | |
c72758f3 | 571 | |
8a78362c | 572 | t->max_segments = min_not_zero(t->max_segments, b->max_segments); |
1e739730 CH |
573 | t->max_discard_segments = min_not_zero(t->max_discard_segments, |
574 | b->max_discard_segments); | |
13f05c8d MP |
575 | t->max_integrity_segments = min_not_zero(t->max_integrity_segments, |
576 | b->max_integrity_segments); | |
c72758f3 MP |
577 | |
578 | t->max_segment_size = min_not_zero(t->max_segment_size, | |
579 | b->max_segment_size); | |
580 | ||
fe0b393f MP |
581 | t->misaligned |= b->misaligned; |
582 | ||
e03a72e1 | 583 | alignment = queue_limit_alignment_offset(b, start); |
9504e086 | 584 | |
81744ee4 MP |
585 | /* Bottom device has different alignment. Check that it is |
586 | * compatible with the current top alignment. | |
587 | */ | |
9504e086 MP |
588 | if (t->alignment_offset != alignment) { |
589 | ||
590 | top = max(t->physical_block_size, t->io_min) | |
591 | + t->alignment_offset; | |
81744ee4 | 592 | bottom = max(b->physical_block_size, b->io_min) + alignment; |
9504e086 | 593 | |
81744ee4 | 594 | /* Verify that top and bottom intervals line up */ |
b8839b8c | 595 | if (max(top, bottom) % min(top, bottom)) { |
9504e086 | 596 | t->misaligned = 1; |
fe0b393f MP |
597 | ret = -1; |
598 | } | |
9504e086 MP |
599 | } |
600 | ||
c72758f3 MP |
601 | t->logical_block_size = max(t->logical_block_size, |
602 | b->logical_block_size); | |
603 | ||
604 | t->physical_block_size = max(t->physical_block_size, | |
605 | b->physical_block_size); | |
606 | ||
607 | t->io_min = max(t->io_min, b->io_min); | |
e9637415 | 608 | t->io_opt = lcm_not_zero(t->io_opt, b->io_opt); |
c964d62f | 609 | t->dma_alignment = max(t->dma_alignment, b->dma_alignment); |
7e7986f9 MS |
610 | |
611 | /* Set non-power-of-2 compatible chunk_sectors boundary */ | |
612 | if (b->chunk_sectors) | |
613 | t->chunk_sectors = gcd(t->chunk_sectors, b->chunk_sectors); | |
9504e086 | 614 | |
81744ee4 | 615 | /* Physical block size a multiple of the logical block size? */ |
9504e086 MP |
616 | if (t->physical_block_size & (t->logical_block_size - 1)) { |
617 | t->physical_block_size = t->logical_block_size; | |
c72758f3 | 618 | t->misaligned = 1; |
fe0b393f | 619 | ret = -1; |
86b37281 MP |
620 | } |
621 | ||
81744ee4 | 622 | /* Minimum I/O a multiple of the physical block size? */ |
9504e086 MP |
623 | if (t->io_min & (t->physical_block_size - 1)) { |
624 | t->io_min = t->physical_block_size; | |
625 | t->misaligned = 1; | |
fe0b393f | 626 | ret = -1; |
c72758f3 MP |
627 | } |
628 | ||
81744ee4 | 629 | /* Optimal I/O a multiple of the physical block size? */ |
9504e086 MP |
630 | if (t->io_opt & (t->physical_block_size - 1)) { |
631 | t->io_opt = 0; | |
632 | t->misaligned = 1; | |
fe0b393f | 633 | ret = -1; |
9504e086 | 634 | } |
c72758f3 | 635 | |
22ada802 MS |
636 | /* chunk_sectors a multiple of the physical block size? */ |
637 | if ((t->chunk_sectors << 9) & (t->physical_block_size - 1)) { | |
638 | t->chunk_sectors = 0; | |
639 | t->misaligned = 1; | |
640 | ret = -1; | |
641 | } | |
642 | ||
c78afc62 KO |
643 | t->raid_partial_stripes_expensive = |
644 | max(t->raid_partial_stripes_expensive, | |
645 | b->raid_partial_stripes_expensive); | |
646 | ||
81744ee4 | 647 | /* Find lowest common alignment_offset */ |
e9637415 | 648 | t->alignment_offset = lcm_not_zero(t->alignment_offset, alignment) |
b8839b8c | 649 | % max(t->physical_block_size, t->io_min); |
86b37281 | 650 | |
81744ee4 | 651 | /* Verify that new alignment_offset is on a logical block boundary */ |
fe0b393f | 652 | if (t->alignment_offset & (t->logical_block_size - 1)) { |
c72758f3 | 653 | t->misaligned = 1; |
fe0b393f MP |
654 | ret = -1; |
655 | } | |
c72758f3 | 656 | |
97f433c3 MP |
657 | t->max_sectors = blk_round_down_sectors(t->max_sectors, t->logical_block_size); |
658 | t->max_hw_sectors = blk_round_down_sectors(t->max_hw_sectors, t->logical_block_size); | |
659 | t->max_dev_sectors = blk_round_down_sectors(t->max_dev_sectors, t->logical_block_size); | |
660 | ||
9504e086 MP |
661 | /* Discard alignment and granularity */ |
662 | if (b->discard_granularity) { | |
e03a72e1 | 663 | alignment = queue_limit_discard_alignment(b, start); |
9504e086 MP |
664 | |
665 | if (t->discard_granularity != 0 && | |
666 | t->discard_alignment != alignment) { | |
667 | top = t->discard_granularity + t->discard_alignment; | |
668 | bottom = b->discard_granularity + alignment; | |
70dd5bf3 | 669 | |
9504e086 | 670 | /* Verify that top and bottom intervals line up */ |
8dd2cb7e | 671 | if ((max(top, bottom) % min(top, bottom)) != 0) |
9504e086 MP |
672 | t->discard_misaligned = 1; |
673 | } | |
674 | ||
81744ee4 MP |
675 | t->max_discard_sectors = min_not_zero(t->max_discard_sectors, |
676 | b->max_discard_sectors); | |
0034af03 JA |
677 | t->max_hw_discard_sectors = min_not_zero(t->max_hw_discard_sectors, |
678 | b->max_hw_discard_sectors); | |
9504e086 MP |
679 | t->discard_granularity = max(t->discard_granularity, |
680 | b->discard_granularity); | |
e9637415 | 681 | t->discard_alignment = lcm_not_zero(t->discard_alignment, alignment) % |
8dd2cb7e | 682 | t->discard_granularity; |
9504e086 | 683 | } |
44abff2c CH |
684 | t->max_secure_erase_sectors = min_not_zero(t->max_secure_erase_sectors, |
685 | b->max_secure_erase_sectors); | |
a805a4fa DLM |
686 | t->zone_write_granularity = max(t->zone_write_granularity, |
687 | b->zone_write_granularity); | |
3093a479 | 688 | t->zoned = max(t->zoned, b->zoned); |
fe0b393f | 689 | return ret; |
c72758f3 | 690 | } |
5d85d324 | 691 | EXPORT_SYMBOL(blk_stack_limits); |
c72758f3 MP |
692 | |
693 | /** | |
694 | * disk_stack_limits - adjust queue limits for stacked drivers | |
77634f33 | 695 | * @disk: MD/DM gendisk (top) |
c72758f3 MP |
696 | * @bdev: the underlying block device (bottom) |
697 | * @offset: offset to beginning of data within component device | |
698 | * | |
699 | * Description: | |
e03a72e1 MP |
700 | * Merges the limits for a top level gendisk and a bottom level |
701 | * block_device. | |
c72758f3 MP |
702 | */ |
703 | void disk_stack_limits(struct gendisk *disk, struct block_device *bdev, | |
704 | sector_t offset) | |
705 | { | |
706 | struct request_queue *t = disk->queue; | |
c72758f3 | 707 | |
9efa82ef | 708 | if (blk_stack_limits(&t->limits, &bdev_get_queue(bdev)->limits, |
453b8ab6 CH |
709 | get_start_sect(bdev) + (offset >> 9)) < 0) |
710 | pr_notice("%s: Warning: Device %pg is misaligned\n", | |
711 | disk->disk_name, bdev); | |
e74d93e9 | 712 | |
471aa704 | 713 | disk_update_readahead(disk); |
c72758f3 MP |
714 | } |
715 | EXPORT_SYMBOL(disk_stack_limits); | |
716 | ||
27f8221a FT |
717 | /** |
718 | * blk_queue_update_dma_pad - update pad mask | |
719 | * @q: the request queue for the device | |
720 | * @mask: pad mask | |
721 | * | |
722 | * Update dma pad mask. | |
723 | * | |
724 | * Appending pad buffer to a request modifies the last entry of a | |
725 | * scatter list such that it includes the pad buffer. | |
726 | **/ | |
727 | void blk_queue_update_dma_pad(struct request_queue *q, unsigned int mask) | |
728 | { | |
729 | if (mask > q->dma_pad_mask) | |
730 | q->dma_pad_mask = mask; | |
731 | } | |
732 | EXPORT_SYMBOL(blk_queue_update_dma_pad); | |
733 | ||
86db1e29 JA |
734 | /** |
735 | * blk_queue_segment_boundary - set boundary rules for segment merging | |
736 | * @q: the request queue for the device | |
737 | * @mask: the memory boundary mask | |
738 | **/ | |
739 | void blk_queue_segment_boundary(struct request_queue *q, unsigned long mask) | |
740 | { | |
09cbfeaf KS |
741 | if (mask < PAGE_SIZE - 1) { |
742 | mask = PAGE_SIZE - 1; | |
24c03d47 HH |
743 | printk(KERN_INFO "%s: set to minimum %lx\n", |
744 | __func__, mask); | |
86db1e29 JA |
745 | } |
746 | ||
025146e1 | 747 | q->limits.seg_boundary_mask = mask; |
86db1e29 | 748 | } |
86db1e29 JA |
749 | EXPORT_SYMBOL(blk_queue_segment_boundary); |
750 | ||
03100aad KB |
751 | /** |
752 | * blk_queue_virt_boundary - set boundary rules for bio merging | |
753 | * @q: the request queue for the device | |
754 | * @mask: the memory boundary mask | |
755 | **/ | |
756 | void blk_queue_virt_boundary(struct request_queue *q, unsigned long mask) | |
757 | { | |
758 | q->limits.virt_boundary_mask = mask; | |
09324d32 CH |
759 | |
760 | /* | |
761 | * Devices that require a virtual boundary do not support scatter/gather | |
762 | * I/O natively, but instead require a descriptor list entry for each | |
763 | * page (which might not be idential to the Linux PAGE_SIZE). Because | |
764 | * of that they are not limited by our notion of "segment size". | |
765 | */ | |
c6c84f78 CH |
766 | if (mask) |
767 | q->limits.max_segment_size = UINT_MAX; | |
03100aad KB |
768 | } |
769 | EXPORT_SYMBOL(blk_queue_virt_boundary); | |
770 | ||
86db1e29 JA |
771 | /** |
772 | * blk_queue_dma_alignment - set dma length and memory alignment | |
773 | * @q: the request queue for the device | |
774 | * @mask: alignment mask | |
775 | * | |
776 | * description: | |
710027a4 | 777 | * set required memory and length alignment for direct dma transactions. |
8feb4d20 | 778 | * this is used when building direct io requests for the queue. |
86db1e29 JA |
779 | * |
780 | **/ | |
781 | void blk_queue_dma_alignment(struct request_queue *q, int mask) | |
782 | { | |
c964d62f | 783 | q->limits.dma_alignment = mask; |
86db1e29 | 784 | } |
86db1e29 JA |
785 | EXPORT_SYMBOL(blk_queue_dma_alignment); |
786 | ||
787 | /** | |
788 | * blk_queue_update_dma_alignment - update dma length and memory alignment | |
789 | * @q: the request queue for the device | |
790 | * @mask: alignment mask | |
791 | * | |
792 | * description: | |
710027a4 | 793 | * update required memory and length alignment for direct dma transactions. |
86db1e29 JA |
794 | * If the requested alignment is larger than the current alignment, then |
795 | * the current queue alignment is updated to the new value, otherwise it | |
796 | * is left alone. The design of this is to allow multiple objects | |
797 | * (driver, device, transport etc) to set their respective | |
798 | * alignments without having them interfere. | |
799 | * | |
800 | **/ | |
801 | void blk_queue_update_dma_alignment(struct request_queue *q, int mask) | |
802 | { | |
803 | BUG_ON(mask > PAGE_SIZE); | |
804 | ||
c964d62f KB |
805 | if (mask > q->limits.dma_alignment) |
806 | q->limits.dma_alignment = mask; | |
86db1e29 | 807 | } |
86db1e29 JA |
808 | EXPORT_SYMBOL(blk_queue_update_dma_alignment); |
809 | ||
d278d4a8 JA |
810 | /** |
811 | * blk_set_queue_depth - tell the block layer about the device queue depth | |
812 | * @q: the request queue for the device | |
813 | * @depth: queue depth | |
814 | * | |
815 | */ | |
816 | void blk_set_queue_depth(struct request_queue *q, unsigned int depth) | |
817 | { | |
818 | q->queue_depth = depth; | |
9677a3e0 | 819 | rq_qos_queue_depth_changed(q); |
d278d4a8 JA |
820 | } |
821 | EXPORT_SYMBOL(blk_set_queue_depth); | |
822 | ||
93e9d8e8 JA |
823 | /** |
824 | * blk_queue_write_cache - configure queue's write cache | |
825 | * @q: the request queue for the device | |
826 | * @wc: write back cache on or off | |
827 | * @fua: device supports FUA writes, if true | |
828 | * | |
829 | * Tell the block layer about the write cache of @q. | |
830 | */ | |
831 | void blk_queue_write_cache(struct request_queue *q, bool wc, bool fua) | |
832 | { | |
c888a8f9 | 833 | if (wc) |
57d74df9 | 834 | blk_queue_flag_set(QUEUE_FLAG_WC, q); |
c888a8f9 | 835 | else |
57d74df9 | 836 | blk_queue_flag_clear(QUEUE_FLAG_WC, q); |
c888a8f9 | 837 | if (fua) |
57d74df9 | 838 | blk_queue_flag_set(QUEUE_FLAG_FUA, q); |
c888a8f9 | 839 | else |
57d74df9 | 840 | blk_queue_flag_clear(QUEUE_FLAG_FUA, q); |
87760e5e | 841 | |
a7905043 | 842 | wbt_set_write_cache(q, test_bit(QUEUE_FLAG_WC, &q->queue_flags)); |
93e9d8e8 JA |
843 | } |
844 | EXPORT_SYMBOL_GPL(blk_queue_write_cache); | |
845 | ||
68c43f13 DLM |
846 | /** |
847 | * blk_queue_required_elevator_features - Set a queue required elevator features | |
848 | * @q: the request queue for the target device | |
849 | * @features: Required elevator features OR'ed together | |
850 | * | |
851 | * Tell the block layer that for the device controlled through @q, only the | |
852 | * only elevators that can be used are those that implement at least the set of | |
853 | * features specified by @features. | |
854 | */ | |
855 | void blk_queue_required_elevator_features(struct request_queue *q, | |
856 | unsigned int features) | |
857 | { | |
858 | q->required_elevator_features = features; | |
859 | } | |
860 | EXPORT_SYMBOL_GPL(blk_queue_required_elevator_features); | |
861 | ||
45147fb5 YS |
862 | /** |
863 | * blk_queue_can_use_dma_map_merging - configure queue for merging segments. | |
864 | * @q: the request queue for the device | |
865 | * @dev: the device pointer for dma | |
866 | * | |
867 | * Tell the block layer about merging the segments by dma map of @q. | |
868 | */ | |
869 | bool blk_queue_can_use_dma_map_merging(struct request_queue *q, | |
870 | struct device *dev) | |
871 | { | |
872 | unsigned long boundary = dma_get_merge_boundary(dev); | |
873 | ||
874 | if (!boundary) | |
875 | return false; | |
876 | ||
877 | /* No need to update max_segment_size. see blk_queue_virt_boundary() */ | |
878 | blk_queue_virt_boundary(q, boundary); | |
879 | ||
880 | return true; | |
881 | } | |
882 | EXPORT_SYMBOL_GPL(blk_queue_can_use_dma_map_merging); | |
883 | ||
e0c60d01 SK |
884 | static bool disk_has_partitions(struct gendisk *disk) |
885 | { | |
886 | unsigned long idx; | |
887 | struct block_device *part; | |
888 | bool ret = false; | |
889 | ||
890 | rcu_read_lock(); | |
891 | xa_for_each(&disk->part_tbl, idx, part) { | |
892 | if (bdev_is_partition(part)) { | |
893 | ret = true; | |
894 | break; | |
895 | } | |
896 | } | |
897 | rcu_read_unlock(); | |
898 | ||
899 | return ret; | |
900 | } | |
901 | ||
27ba3e8f | 902 | /** |
6b2bd274 | 903 | * disk_set_zoned - configure the zoned model for a disk |
27ba3e8f DLM |
904 | * @disk: the gendisk of the queue to configure |
905 | * @model: the zoned model to set | |
906 | * | |
6b2bd274 CH |
907 | * Set the zoned model of @disk to @model. |
908 | * | |
27ba3e8f DLM |
909 | * When @model is BLK_ZONED_HM (host managed), this should be called only |
910 | * if zoned block device support is enabled (CONFIG_BLK_DEV_ZONED option). | |
911 | * If @model specifies BLK_ZONED_HA (host aware), the effective model used | |
912 | * depends on CONFIG_BLK_DEV_ZONED settings and on the existence of partitions | |
913 | * on the disk. | |
914 | */ | |
6b2bd274 | 915 | void disk_set_zoned(struct gendisk *disk, enum blk_zoned_model model) |
27ba3e8f | 916 | { |
a805a4fa DLM |
917 | struct request_queue *q = disk->queue; |
918 | ||
27ba3e8f DLM |
919 | switch (model) { |
920 | case BLK_ZONED_HM: | |
921 | /* | |
922 | * Host managed devices are supported only if | |
923 | * CONFIG_BLK_DEV_ZONED is enabled. | |
924 | */ | |
925 | WARN_ON_ONCE(!IS_ENABLED(CONFIG_BLK_DEV_ZONED)); | |
926 | break; | |
927 | case BLK_ZONED_HA: | |
928 | /* | |
929 | * Host aware devices can be treated either as regular block | |
930 | * devices (similar to drive managed devices) or as zoned block | |
931 | * devices to take advantage of the zone command set, similarly | |
932 | * to host managed devices. We try the latter if there are no | |
933 | * partitions and zoned block device support is enabled, else | |
934 | * we do nothing special as far as the block layer is concerned. | |
935 | */ | |
936 | if (!IS_ENABLED(CONFIG_BLK_DEV_ZONED) || | |
e0c60d01 | 937 | disk_has_partitions(disk)) |
27ba3e8f DLM |
938 | model = BLK_ZONED_NONE; |
939 | break; | |
940 | case BLK_ZONED_NONE: | |
941 | default: | |
942 | if (WARN_ON_ONCE(model != BLK_ZONED_NONE)) | |
943 | model = BLK_ZONED_NONE; | |
944 | break; | |
945 | } | |
946 | ||
a805a4fa DLM |
947 | q->limits.zoned = model; |
948 | if (model != BLK_ZONED_NONE) { | |
949 | /* | |
950 | * Set the zone write granularity to the device logical block | |
951 | * size by default. The driver can change this value if needed. | |
952 | */ | |
953 | blk_queue_zone_write_granularity(q, | |
954 | queue_logical_block_size(q)); | |
508aebb8 | 955 | } else { |
b3c72f81 | 956 | disk_clear_zone_settings(disk); |
a805a4fa | 957 | } |
27ba3e8f | 958 | } |
6b2bd274 | 959 | EXPORT_SYMBOL_GPL(disk_set_zoned); |
89098b07 CH |
960 | |
961 | int bdev_alignment_offset(struct block_device *bdev) | |
962 | { | |
963 | struct request_queue *q = bdev_get_queue(bdev); | |
964 | ||
965 | if (q->limits.misaligned) | |
966 | return -1; | |
967 | if (bdev_is_partition(bdev)) | |
968 | return queue_limit_alignment_offset(&q->limits, | |
969 | bdev->bd_start_sect); | |
970 | return q->limits.alignment_offset; | |
971 | } | |
972 | EXPORT_SYMBOL_GPL(bdev_alignment_offset); | |
5c4b4a5c CH |
973 | |
974 | unsigned int bdev_discard_alignment(struct block_device *bdev) | |
975 | { | |
976 | struct request_queue *q = bdev_get_queue(bdev); | |
977 | ||
978 | if (bdev_is_partition(bdev)) | |
979 | return queue_limit_discard_alignment(&q->limits, | |
980 | bdev->bd_start_sect); | |
981 | return q->limits.discard_alignment; | |
982 | } | |
983 | EXPORT_SYMBOL_GPL(bdev_discard_alignment); |