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