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Commit 906b973c authored by Kent Overstreet's avatar Kent Overstreet Committed by Linus Torvalds
Browse files

aio: add kiocb_cancel() 



Minor refactoring, to get rid of some duplicated code

[akpm@linux-foundation.org: fix warning]
Signed-off-by: default avatarKent Overstreet <koverstreet@google.com>
Cc: Zach Brown <zab@redhat.com>
Cc: Felipe Balbi <balbi@ti.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Mark Fasheh <mfasheh@suse.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Asai Thambi S P <asamymuthupa@micron.com>
Cc: Selvan Mani <smani@micron.com>
Cc: Sam Bradshaw <sbradshaw@micron.com>
Acked-by: default avatarJeff Moyer <jmoyer@redhat.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Benjamin LaHaise <bcrl@kvack.org>
Reviewed-by: default avatar"Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 2d68449e

fs/aio.c

+43 −36
Original line number Diff line number Diff line
@@ -220,6 +220,29 @@ static inline void put_ioctx(struct kioctx *kioctx) 
		__put_ioctx(kioctx);

}



static int kiocb_cancel(struct kioctx *ctx, struct kiocb *kiocb,

			struct io_event *res)

{

	int (*cancel)(struct kiocb *, struct io_event *);

	int ret = -EINVAL;



	cancel = kiocb->ki_cancel;

	kiocbSetCancelled(kiocb);

	if (cancel) {

		kiocb->ki_users++;

		spin_unlock_irq(&ctx->ctx_lock);



		memset(res, 0, sizeof(*res));

		res->obj = (u64)(unsigned long)kiocb->ki_obj.user;

		res->data = kiocb->ki_user_data;

		ret = cancel(kiocb, res);



		spin_lock_irq(&ctx->ctx_lock);

	}



	return ret;

}



/* ioctx_alloc

 *	Allocates and initializes an ioctx.  Returns an ERR_PTR if it failed.

 */
@@ -290,25 +313,19 @@ static struct kioctx *ioctx_alloc(unsigned nr_events) 
 */

static void kill_ctx(struct kioctx *ctx)

{

	int (*cancel)(struct kiocb *, struct io_event *);

	struct task_struct *tsk = current;

	DECLARE_WAITQUEUE(wait, tsk);

	struct io_event res;

	struct kiocb *req;



	spin_lock_irq(&ctx->ctx_lock);

	ctx->dead = 1;

	while (!list_empty(&ctx->active_reqs)) {

		struct list_head *pos = ctx->active_reqs.next;

		struct kiocb *iocb = list_kiocb(pos);

		list_del_init(&iocb->ki_list);

		cancel = iocb->ki_cancel;

		kiocbSetCancelled(iocb);

		if (cancel) {

			iocb->ki_users++;

			spin_unlock_irq(&ctx->ctx_lock);

			cancel(iocb, &res);

			spin_lock_irq(&ctx->ctx_lock);

		}

		req = list_first_entry(&ctx->active_reqs,

					struct kiocb, ki_list);



		list_del_init(&req->ki_list);

		kiocb_cancel(ctx, req, &res);

	}



	if (!ctx->reqs_active)
@@ -1416,7 +1433,7 @@ static struct kiocb *lookup_kiocb(struct kioctx *ctx, struct iocb __user *iocb, 
SYSCALL_DEFINE3(io_cancel, aio_context_t, ctx_id, struct iocb __user *, iocb,

		struct io_event __user *, result)

{

	int (*cancel)(struct kiocb *iocb, struct io_event *res);

	struct io_event res;

	struct kioctx *ctx;

	struct kiocb *kiocb;

	u32 key;
@@ -1431,32 +1448,22 @@ SYSCALL_DEFINE3(io_cancel, aio_context_t, ctx_id, struct iocb __user *, iocb, 
		return -EINVAL;



	spin_lock_irq(&ctx->ctx_lock);

	ret = -EAGAIN;



	kiocb = lookup_kiocb(ctx, iocb, key);

	if (kiocb && kiocb->ki_cancel) {

		cancel = kiocb->ki_cancel;

		kiocb->ki_users ++;

		kiocbSetCancelled(kiocb);

	} else

		cancel = NULL;

	if (kiocb)

		ret = kiocb_cancel(ctx, kiocb, &res);

	else

		ret = -EINVAL;



	spin_unlock_irq(&ctx->ctx_lock);



	if (NULL != cancel) {

		struct io_event tmp;

		pr_debug("calling cancel\n");

		memset(&tmp, 0, sizeof(tmp));

		tmp.obj = (u64)(unsigned long)kiocb->ki_obj.user;

		tmp.data = kiocb->ki_user_data;

		ret = cancel(kiocb, &tmp);

	if (!ret) {

		/* Cancellation succeeded -- copy the result

		 * into the user's buffer.

		 */

			if (copy_to_user(result, &tmp, sizeof(tmp)))

		if (copy_to_user(result, &res, sizeof(res)))

			ret = -EFAULT;

	}

	} else

		ret = -EINVAL;



	put_ioctx(ctx);