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io-wq: make the io_wq ref counted 

In preparation for sharing an io-wq across different users, add a
reference count that manages destruction of it.

Reviewed-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2020-01-23 15:33:32 -07:00
parent 9466f43741
commit 848f7e1887
1 changed files with 10 additions and 1 deletions
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11
fs/io-wq.c
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@ -113,6 +113,8 @@ struct io_wq {
struct mm_struct *mm;
refcount_t refs;
struct completion done;
refcount_t use_refs;
};
static bool io_worker_get(struct io_worker *worker)
@ -1073,6 +1075,7 @@ struct io_wq *io_wq_create(unsigned bounded, struct io_wq_data *data)
ret = -ENOMEM;
goto err;
}
refcount_set(&wq->use_refs, 1);
reinit_completion(&wq->done);
return wq;
}
@ -1093,7 +1096,7 @@ static bool io_wq_worker_wake(struct io_worker *worker, void *data)
return false;
}
void io_wq_destroy(struct io_wq *wq)
static void __io_wq_destroy(struct io_wq *wq)
{
int node;
@ -1113,3 +1116,9 @@ void io_wq_destroy(struct io_wq *wq)
kfree(wq->wqes);
kfree(wq);
}
void io_wq_destroy(struct io_wq *wq)
{
if (refcount_dec_and_test(&wq->use_refs))
__io_wq_destroy(wq);
}