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loop: add helper lo_cmd_nr_bvec() 

Add lo_cmd_nr_bvec() and prepare for refactoring lo_rw_aio().

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Ming Lei 2025-10-15 19:07:26 +08:00 committed by Jens Axboe
parent 2c6d792d4b
commit c3e6c11147
1 changed files with 14 additions and 4 deletions
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18
drivers/block/loop.c
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@ -337,6 +337,19 @@ static void lo_rw_aio_complete(struct kiocb *iocb, long ret)
lo_rw_aio_do_completion(cmd);
}
static inline unsigned lo_cmd_nr_bvec(struct loop_cmd *cmd)
{
struct request *rq = blk_mq_rq_from_pdu(cmd);
struct req_iterator rq_iter;
struct bio_vec tmp;
int nr_bvec = 0;
rq_for_each_bvec(tmp, rq, rq_iter)
nr_bvec++;
return nr_bvec;
}
static int lo_rw_aio(struct loop_device *lo, struct loop_cmd *cmd,
loff_t pos, int rw)
{
@ -348,12 +361,9 @@ static int lo_rw_aio(struct loop_device *lo, struct loop_cmd *cmd,
struct file *file = lo->lo_backing_file;
struct bio_vec tmp;
unsigned int offset;
int nr_bvec = 0;
int nr_bvec = lo_cmd_nr_bvec(cmd);
int ret;
rq_for_each_bvec(tmp, rq, rq_iter)
nr_bvec++;
if (rq->bio != rq->biotail) {
bvec = kmalloc_array(nr_bvec, sizeof(struct bio_vec),