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block: simplify struct io_context refcounting

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Don't hold a reference to ->refcount for each active reference, but
just one for all active references.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/20211209063131.18537-3-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2021-12-09 07:31:22 +01:00 committed by Jens Axboe
parent 8a2ba1785c
commit 0aed2f162b
1 changed files with 1 additions and 4 deletions
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5
block/blk-ioc.c
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@ -180,10 +180,8 @@ static void put_io_context_active(struct io_context *ioc)
{
struct io_cq *icq;
if (!atomic_dec_and_test(&ioc->active_ref)) {
put_io_context(ioc);
if (!atomic_dec_and_test(&ioc->active_ref))
return;
}
spin_lock_irq(&ioc->lock);
hlist_for_each_entry(icq, &ioc->icq_list, ioc_node) {
@ -335,7 +333,6 @@ int __copy_io(unsigned long clone_flags, struct task_struct *tsk)
* Share io context with parent, if CLONE_IO is set
*/
if (clone_flags & CLONE_IO) {
atomic_long_inc(&ioc->refcount);
atomic_inc(&ioc->active_ref);
tsk->io_context = ioc;
} else if (ioprio_valid(ioc->ioprio)) {