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block: add a rq_list type

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Replace the semi-open coded request list helpers with a proper rq_list
type that mirrors the bio_list and has head and tail pointers.  Besides
better type safety this actually allows to insert at the tail of the
list, which will be useful soon.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20241113152050.157179-5-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig
2024-11-13 16:20:44 +01:00
committed by Jens Axboe
parent e8225ab150
commit a3396b9999
11 changed files with 102 additions and 86 deletions
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11
include/linux/blkdev.h
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@@ -1007,6 +1007,11 @@ extern void blk_put_queue(struct request_queue *);
void blk_mark_disk_dead(struct gendisk *disk);
#ifdef CONFIG_BLOCK
struct rq_list {
struct request *head;
struct request *tail;
};
/*
* blk_plug permits building a queue of related requests by holding the I/O
* fragments for a short period. This allows merging of sequential requests
@@ -1019,10 +1024,10 @@ void blk_mark_disk_dead(struct gendisk *disk);
* blk_flush_plug() is called.
*/
struct blk_plug {
struct request *mq_list; /* blk-mq requests */
struct rq_list mq_list; /* blk-mq requests */
/* if ios_left is > 1, we can batch tag/rq allocations */
struct request *cached_rq;
struct rq_list cached_rqs;
u64 cur_ktime;
unsigned short nr_ios;
@@ -1684,7 +1689,7 @@ int bdev_thaw(struct block_device *bdev);
void bdev_fput(struct file *bdev_file);
struct io_comp_batch {
struct request *req_list;
struct rq_list req_list;
bool need_ts;
void (*complete)(struct io_comp_batch *);
};