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loop: move command blkcg/memcg initialization into loop_queue_work 

Move loop command blkcg/memcg initialization into loop_queue_work,
and prepare for supporting to handle loop io command by IOCB_NOWAIT.

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 19:07:29 +08:00 committed by Jens Axboe
parent c66e9708f9
commit f4788ae9d7
1 changed files with 17 additions and 15 deletions
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32
drivers/block/loop.c
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@ -831,11 +831,28 @@ static inline int queue_on_root_worker(struct cgroup_subsys_state *css)
static void loop_queue_work(struct loop_device *lo, struct loop_cmd *cmd)
{
struct request __maybe_unused *rq = blk_mq_rq_from_pdu(cmd);
struct rb_node **node, *parent = NULL;
struct loop_worker *cur_worker, *worker = NULL;
struct work_struct *work;
struct list_head *cmd_list;
/* always use the first bio's css */
cmd->blkcg_css = NULL;
cmd->memcg_css = NULL;
#ifdef CONFIG_BLK_CGROUP
if (rq->bio) {
cmd->blkcg_css = bio_blkcg_css(rq->bio);
#ifdef CONFIG_MEMCG
if (cmd->blkcg_css) {
cmd->memcg_css =
cgroup_get_e_css(cmd->blkcg_css->cgroup,
&memory_cgrp_subsys);
}
#endif
}
#endif
spin_lock_irq(&lo->lo_work_lock);
if (queue_on_root_worker(cmd->blkcg_css))
@ -1907,21 +1924,6 @@ static blk_status_t loop_queue_rq(struct blk_mq_hw_ctx *hctx,
break;
}
/* always use the first bio's css */
cmd->blkcg_css = NULL;
cmd->memcg_css = NULL;
#ifdef CONFIG_BLK_CGROUP
if (rq->bio) {
cmd->blkcg_css = bio_blkcg_css(rq->bio);
#ifdef CONFIG_MEMCG
if (cmd->blkcg_css) {
cmd->memcg_css =
cgroup_get_e_css(cmd->blkcg_css->cgroup,
&memory_cgrp_subsys);
}
#endif
}
#endif
loop_queue_work(lo, cmd);
return BLK_STS_OK;