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block: remove the nr_task field from struct io_context 

Nothing ever looks at ->nr_tasks, so remove it.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/20211209063131.18537-2-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2021-12-09 07:31:21 +01:00 committed by Jens Axboe
parent d62cbcf62f
commit 8a2ba1785c
2 changed files with 0 additions and 4 deletions
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3
block/blk-ioc.c
View File

@ -207,7 +207,6 @@ void exit_io_context(struct task_struct *task)
task->io_context = NULL;
task_unlock(task);
atomic_dec(&ioc->nr_tasks);
put_io_context_active(ioc);
}
@ -259,7 +258,6 @@ static struct io_context *alloc_io_context(gfp_t gfp_flags, int node)
return NULL;
atomic_long_set(&ioc->refcount, 1);
atomic_set(&ioc->nr_tasks, 1);
atomic_set(&ioc->active_ref, 1);
spin_lock_init(&ioc->lock);
INIT_RADIX_TREE(&ioc->icq_tree, GFP_ATOMIC);
@ -339,7 +337,6 @@ int __copy_io(unsigned long clone_flags, struct task_struct *tsk)
if (clone_flags & CLONE_IO) {
atomic_long_inc(&ioc->refcount);
atomic_inc(&ioc->active_ref);
atomic_inc(&ioc->nr_tasks);
tsk->io_context = ioc;
} else if (ioprio_valid(ioc->ioprio)) {
tsk->io_context = alloc_io_context(GFP_KERNEL, NUMA_NO_NODE);

1
include/linux/iocontext.h
View File

@ -99,7 +99,6 @@ struct io_cq {
struct io_context {
atomic_long_t refcount;
atomic_t active_ref;
atomic_t nr_tasks;
/* all the fields below are protected by this lock */
spinlock_t lock;