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block: introduce blk_mq_tagset_iter

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Iterator helper to apply a function on all the
tags in a given tagset. export it as it will be used
outside the block layer later on.

Reviewed-by: Bart Van Assche <bart.vanassche@wdc.com>
Reviewed-by: Jens Axboe <axboe@kernel.dk>
Reviewed-by: Max Gurtovoy <maxg@mellanox.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Sagi Grimberg 2017-10-11 12:53:06 +03:00 committed by Christoph Hellwig
parent 761f2e1ed8
commit 149e10f8ff
2 changed files with 13 additions and 5 deletions
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16
block/blk-mq-tag.c
View file

@ -298,12 +298,12 @@ void blk_mq_tagset_busy_iter(struct blk_mq_tag_set *tagset,
}
EXPORT_SYMBOL(blk_mq_tagset_busy_iter);
int blk_mq_reinit_tagset(struct blk_mq_tag_set *set,
int (reinit_request)(void *, struct request *))
int blk_mq_tagset_iter(struct blk_mq_tag_set *set, void *data,
int (fn)(void *, struct request *))
{
int i, j, ret = 0;
if (WARN_ON_ONCE(!reinit_request))
if (WARN_ON_ONCE(!fn))
goto out;
for (i = 0; i < set->nr_hw_queues; i++) {
@ -316,8 +316,7 @@ int blk_mq_reinit_tagset(struct blk_mq_tag_set *set,
if (!tags->static_rqs[j])
continue;
ret = reinit_request(set->driver_data,
tags->static_rqs[j]);
ret = fn(data, tags->static_rqs[j]);
if (ret)
goto out;
}
@ -326,6 +325,13 @@ int blk_mq_reinit_tagset(struct blk_mq_tag_set *set,
out:
return ret;
}
EXPORT_SYMBOL_GPL(blk_mq_tagset_iter);
int blk_mq_reinit_tagset(struct blk_mq_tag_set *set,
int (reinit_request)(void *, struct request *))
{
return blk_mq_tagset_iter(set, set->driver_data, reinit_request);
}
EXPORT_SYMBOL_GPL(blk_mq_reinit_tagset);
void blk_mq_queue_tag_busy_iter(struct request_queue *q, busy_iter_fn *fn,

2
include/linux/blk-mq.h
View file

@ -259,6 +259,8 @@ void blk_freeze_queue_start(struct request_queue *q);
void blk_mq_freeze_queue_wait(struct request_queue *q);
int blk_mq_freeze_queue_wait_timeout(struct request_queue *q,
unsigned long timeout);
int blk_mq_tagset_iter(struct blk_mq_tag_set *set, void *data,
int (reinit_request)(void *, struct request *));
int blk_mq_reinit_tagset(struct blk_mq_tag_set *set,
int (reinit_request)(void *, struct request *));