| blk-mq.h (edd1dbc83b1de3b98590b76e09b86ddf6887fce7) | blk-mq.h (6deacb3bfac2b720e707c566549a7041f17db9c8) |
|---|---|
| 1/* SPDX-License-Identifier: GPL-2.0 */ 2#ifndef INT_BLK_MQ_H 3#define INT_BLK_MQ_H 4 5#include "blk-stat.h" 6#include "blk-mq-tag.h" 7 8struct blk_mq_tag_set; --- 280 unchanged lines hidden (view full) --- 289 int cpu; 290 291 for_each_possible_cpu(cpu) 292 qmap->mq_map[cpu] = 0; 293} 294 295/* 296 * blk_mq_plug() - Get caller context plug | 1/* SPDX-License-Identifier: GPL-2.0 */ 2#ifndef INT_BLK_MQ_H 3#define INT_BLK_MQ_H 4 5#include "blk-stat.h" 6#include "blk-mq-tag.h" 7 8struct blk_mq_tag_set; --- 280 unchanged lines hidden (view full) --- 289 int cpu; 290 291 for_each_possible_cpu(cpu) 292 qmap->mq_map[cpu] = 0; 293} 294 295/* 296 * blk_mq_plug() - Get caller context plug |
| 297 * @q: request queue | |
| 298 * @bio : the bio being submitted by the caller context 299 * 300 * Plugging, by design, may delay the insertion of BIOs into the elevator in 301 * order to increase BIO merging opportunities. This however can cause BIO 302 * insertion order to change from the order in which submit_bio() is being 303 * executed in the case of multiple contexts concurrently issuing BIOs to a 304 * device, even if these context are synchronized to tightly control BIO issuing 305 * order. While this is not a problem with regular block devices, this ordering 306 * change can cause write BIO failures with zoned block devices as these 307 * require sequential write patterns to zones. Prevent this from happening by | 297 * @bio : the bio being submitted by the caller context 298 * 299 * Plugging, by design, may delay the insertion of BIOs into the elevator in 300 * order to increase BIO merging opportunities. This however can cause BIO 301 * insertion order to change from the order in which submit_bio() is being 302 * executed in the case of multiple contexts concurrently issuing BIOs to a 303 * device, even if these context are synchronized to tightly control BIO issuing 304 * order. While this is not a problem with regular block devices, this ordering 305 * change can cause write BIO failures with zoned block devices as these 306 * require sequential write patterns to zones. Prevent this from happening by |
| 308 * ignoring the plug state of a BIO issuing context if the target request queue 309 * is for a zoned block device and the BIO to plug is a write operation. | 307 * ignoring the plug state of a BIO issuing context if it is for a zoned block 308 * device and the BIO to plug is a write operation. |
| 310 * 311 * Return current->plug if the bio can be plugged and NULL otherwise 312 */ | 309 * 310 * Return current->plug if the bio can be plugged and NULL otherwise 311 */ |
| 313static inline struct blk_plug *blk_mq_plug(struct request_queue *q, 314 struct bio *bio) | 312static inline struct blk_plug *blk_mq_plug( struct bio *bio) |
| 315{ | 313{ |
| 314 /* Zoned block device write operation case: do not plug the BIO */ 315 if (bdev_is_zoned(bio->bi_bdev) && op_is_write(bio_op(bio))) 316 return NULL; 317 |
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| 316 /* 317 * For regular block devices or read operations, use the context plug 318 * which may be NULL if blk_start_plug() was not executed. 319 */ | 318 /* 319 * For regular block devices or read operations, use the context plug 320 * which may be NULL if blk_start_plug() was not executed. 321 */ |
| 320 if (!bdev_is_zoned(bio->bi_bdev) || !op_is_write(bio_op(bio))) 321 return current->plug; 322 323 /* Zoned block device write operation case: do not plug the BIO */ 324 return NULL; | 322 return current->plug; |
| 325} 326 327/* Free all requests on the list */ 328static inline void blk_mq_free_requests(struct list_head *list) 329{ 330 while (!list_empty(list)) { 331 struct request *rq = list_entry_rq(list->next); 332 --- 66 unchanged lines hidden --- | 323} 324 325/* Free all requests on the list */ 326static inline void blk_mq_free_requests(struct list_head *list) 327{ 328 while (!list_empty(list)) { 329 struct request *rq = list_entry_rq(list->next); 330 --- 66 unchanged lines hidden --- |