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block: add a struct io_comp_batch argument to fops->iopoll()

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struct io_comp_batch contains a list head and a completion handler, which
will allow completions to more effciently completed batches of IO.

For now, no functional changes in this patch, we just define the
io_comp_batch structure and add the argument to the file_operations iopoll
handler.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2021-10-12 09:24:29 -06:00
parent 013a7f9543
commit 5a72e899ce
16 changed files with 39 additions and 25 deletions
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13
include/linux/blkdev.h
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@ -569,8 +569,9 @@ blk_status_t errno_to_blk_status(int errno);
#define BLK_POLL_ONESHOT (1 << 0)
/* do not sleep to wait for the expected completion time */
#define BLK_POLL_NOSLEEP (1 << 1)
int bio_poll(struct bio *bio, unsigned int flags);
int iocb_bio_iopoll(struct kiocb *kiocb, unsigned int flags);
int bio_poll(struct bio *bio, struct io_comp_batch *iob, unsigned int flags);
int iocb_bio_iopoll(struct kiocb *kiocb, struct io_comp_batch *iob,
unsigned int flags);
static inline struct request_queue *bdev_get_queue(struct block_device *bdev)
{
@ -1298,6 +1299,14 @@ int fsync_bdev(struct block_device *bdev);
int freeze_bdev(struct block_device *bdev);
int thaw_bdev(struct block_device *bdev);
struct io_comp_batch {
struct request *req_list;
bool need_ts;
void (*complete)(struct io_comp_batch *);
};
#define DEFINE_IO_COMP_BATCH(name) struct io_comp_batch name = { }
#define rq_list_add(listptr, rq) do { \
(rq)->rq_next = *(listptr); \
*(listptr) = rq; \