[linux-2.6-block.git] / io_uring / cancel.c

// SPDX-License-Identifier: GPL-2.0
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/file.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/namei.h>
#include <linux/nospec.h>
#include <linux/io_uring.h>

#include <uapi/linux/io_uring.h>

#include "io_uring.h"
#include "tctx.h"
#include "poll.h"
#include "timeout.h"
#include "cancel.h"

struct io_cancel {
	struct file			*file;
	u64				addr;
	u32				flags;
	s32				fd;
	u8				opcode;
};

#define CANCEL_FLAGS	(IORING_ASYNC_CANCEL_ALL | IORING_ASYNC_CANCEL_FD | \
			 IORING_ASYNC_CANCEL_ANY | IORING_ASYNC_CANCEL_FD_FIXED | \
			 IORING_ASYNC_CANCEL_USERDATA | IORING_ASYNC_CANCEL_OP)

/*
 * Returns true if the request matches the criteria outlined by 'cd'.
 */
bool io_cancel_req_match(struct io_kiocb *req, struct io_cancel_data *cd)
{
	bool match_user_data = cd->flags & IORING_ASYNC_CANCEL_USERDATA;

	if (req->ctx != cd->ctx)
		return false;

	if (!(cd->flags & (IORING_ASYNC_CANCEL_FD | IORING_ASYNC_CANCEL_OP)))
		match_user_data = true;

	if (cd->flags & IORING_ASYNC_CANCEL_ANY)
		goto check_seq;
	if (cd->flags & IORING_ASYNC_CANCEL_FD) {
		if (req->file != cd->file)
			return false;
	}
	if (cd->flags & IORING_ASYNC_CANCEL_OP) {
		if (req->opcode != cd->opcode)
			return false;
	}
	if (match_user_data && req->cqe.user_data != cd->data)
		return false;
	if (cd->flags & IORING_ASYNC_CANCEL_ALL) {
check_seq:
		if (cd->seq == req->work.cancel_seq)
			return false;
		req->work.cancel_seq = cd->seq;
	}

	return true;
}

static bool io_cancel_cb(struct io_wq_work *work, void *data)
{
	struct io_kiocb *req = container_of(work, struct io_kiocb, work);
	struct io_cancel_data *cd = data;

	return io_cancel_req_match(req, cd);
}

static int io_async_cancel_one(struct io_uring_task *tctx,
			       struct io_cancel_data *cd)
{
	enum io_wq_cancel cancel_ret;
	int ret = 0;
	bool all;

	if (!tctx || !tctx->io_wq)
		return -ENOENT;

	all = cd->flags & (IORING_ASYNC_CANCEL_ALL|IORING_ASYNC_CANCEL_ANY);
	cancel_ret = io_wq_cancel_cb(tctx->io_wq, io_cancel_cb, cd, all);
	switch (cancel_ret) {
	case IO_WQ_CANCEL_OK:
		ret = 0;
		break;
	case IO_WQ_CANCEL_RUNNING:
		ret = -EALREADY;
		break;
	case IO_WQ_CANCEL_NOTFOUND:
		ret = -ENOENT;
		break;
	}

	return ret;
}

int io_try_cancel(struct io_uring_task *tctx, struct io_cancel_data *cd,
		  unsigned issue_flags)
{
	struct io_ring_ctx *ctx = cd->ctx;
	int ret;

	WARN_ON_ONCE(!io_wq_current_is_worker() && tctx != current->io_uring);

	ret = io_async_cancel_one(tctx, cd);
	/*
	 * Fall-through even for -EALREADY, as we may have poll armed
	 * that need unarming.
	 */
	if (!ret)
		return 0;

	ret = io_poll_cancel(ctx, cd, issue_flags);
	if (ret != -ENOENT)
		return ret;

	spin_lock(&ctx->completion_lock);
	if (!(cd->flags & IORING_ASYNC_CANCEL_FD))
		ret = io_timeout_cancel(ctx, cd);
	spin_unlock(&ctx->completion_lock);
	return ret;
}

int io_async_cancel_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
{
	struct io_cancel *cancel = io_kiocb_to_cmd(req, struct io_cancel);

	if (unlikely(req->flags & REQ_F_BUFFER_SELECT))
		return -EINVAL;
	if (sqe->off || sqe->splice_fd_in)
		return -EINVAL;

	cancel->addr = READ_ONCE(sqe->addr);
	cancel->flags = READ_ONCE(sqe->cancel_flags);
	if (cancel->flags & ~CANCEL_FLAGS)
		return -EINVAL;
	if (cancel->flags & IORING_ASYNC_CANCEL_FD) {
		if (cancel->flags & IORING_ASYNC_CANCEL_ANY)
			return -EINVAL;
		cancel->fd = READ_ONCE(sqe->fd);
	}
	if (cancel->flags & IORING_ASYNC_CANCEL_OP) {
		if (cancel->flags & IORING_ASYNC_CANCEL_ANY)
			return -EINVAL;
		cancel->opcode = READ_ONCE(sqe->len);
	}

	return 0;
}

static int __io_async_cancel(struct io_cancel_data *cd,
			     struct io_uring_task *tctx,
			     unsigned int issue_flags)
{
	bool all = cd->flags & (IORING_ASYNC_CANCEL_ALL|IORING_ASYNC_CANCEL_ANY);
	struct io_ring_ctx *ctx = cd->ctx;
	struct io_tctx_node *node;
	int ret, nr = 0;

	do {
		ret = io_try_cancel(tctx, cd, issue_flags);
		if (ret == -ENOENT)
			break;
		if (!all)
			return ret;
		nr++;
	} while (1);

	/* slow path, try all io-wq's */
	io_ring_submit_lock(ctx, issue_flags);
	ret = -ENOENT;
	list_for_each_entry(node, &ctx->tctx_list, ctx_node) {
		struct io_uring_task *tctx = node->task->io_uring;

		ret = io_async_cancel_one(tctx, cd);
		if (ret != -ENOENT) {
			if (!all)
				break;
			nr++;
		}
	}
	io_ring_submit_unlock(ctx, issue_flags);
	return all ? nr : ret;
}

int io_async_cancel(struct io_kiocb *req, unsigned int issue_flags)
{
	struct io_cancel *cancel = io_kiocb_to_cmd(req, struct io_cancel);
	struct io_cancel_data cd = {
		.ctx	= req->ctx,
		.data	= cancel->addr,
		.flags	= cancel->flags,
		.opcode	= cancel->opcode,
		.seq	= atomic_inc_return(&req->ctx->cancel_seq),
	};
	struct io_uring_task *tctx = req->task->io_uring;
	int ret;

	if (cd.flags & IORING_ASYNC_CANCEL_FD) {
		if (req->flags & REQ_F_FIXED_FILE ||
		    cd.flags & IORING_ASYNC_CANCEL_FD_FIXED) {
			req->flags |= REQ_F_FIXED_FILE;
			req->file = io_file_get_fixed(req, cancel->fd,
							issue_flags);
		} else {
			req->file = io_file_get_normal(req, cancel->fd);
		}
		if (!req->file) {
			ret = -EBADF;
			goto done;
		}
		cd.file = req->file;
	}

	ret = __io_async_cancel(&cd, tctx, issue_flags);
done:
	if (ret < 0)
		req_set_fail(req);
	io_req_set_res(req, ret, 0);
	return IOU_OK;
}

void init_hash_table(struct io_hash_table *table, unsigned size)
{
	unsigned int i;

	for (i = 0; i < size; i++) {
		spin_lock_init(&table->hbs[i].lock);
		INIT_HLIST_HEAD(&table->hbs[i].list);
	}
}

static int __io_sync_cancel(struct io_uring_task *tctx,
			    struct io_cancel_data *cd, int fd)
{
	struct io_ring_ctx *ctx = cd->ctx;

	/* fixed must be grabbed every time since we drop the uring_lock */
	if ((cd->flags & IORING_ASYNC_CANCEL_FD) &&
	    (cd->flags & IORING_ASYNC_CANCEL_FD_FIXED)) {
		if (unlikely(fd >= ctx->nr_user_files))
			return -EBADF;
		fd = array_index_nospec(fd, ctx->nr_user_files);
		cd->file = io_file_from_index(&ctx->file_table, fd);
		if (!cd->file)
			return -EBADF;
	}

	return __io_async_cancel(cd, tctx, 0);
}

int io_sync_cancel(struct io_ring_ctx *ctx, void __user *arg)
	__must_hold(&ctx->uring_lock)
{
	struct io_cancel_data cd = {
		.ctx	= ctx,
		.seq	= atomic_inc_return(&ctx->cancel_seq),
	};
	ktime_t timeout = KTIME_MAX;
	struct io_uring_sync_cancel_reg sc;
	struct fd f = { };
	DEFINE_WAIT(wait);
	int ret;

	if (copy_from_user(&sc, arg, sizeof(sc)))
		return -EFAULT;
	if (sc.flags & ~CANCEL_FLAGS)
		return -EINVAL;
	if (sc.pad[0] || sc.pad[1] || sc.pad[2] || sc.pad[3])
		return -EINVAL;

	cd.data = sc.addr;
	cd.flags = sc.flags;

	/* we can grab a normal file descriptor upfront */
	if ((cd.flags & IORING_ASYNC_CANCEL_FD) &&
	   !(cd.flags & IORING_ASYNC_CANCEL_FD_FIXED)) {
		f = fdget(sc.fd);
		if (!f.file)
			return -EBADF;
		cd.file = f.file;
	}

	ret = __io_sync_cancel(current->io_uring, &cd, sc.fd);

	/* found something, done! */
	if (ret != -EALREADY)
		goto out;

	if (sc.timeout.tv_sec != -1UL || sc.timeout.tv_nsec != -1UL) {
		struct timespec64 ts = {
			.tv_sec		= sc.timeout.tv_sec,
			.tv_nsec	= sc.timeout.tv_nsec
		};

		timeout = ktime_add_ns(timespec64_to_ktime(ts), ktime_get_ns());
	}

	/*
	 * Keep looking until we get -ENOENT. we'll get woken everytime
	 * every time a request completes and will retry the cancelation.
	 */
	do {
		cd.seq = atomic_inc_return(&ctx->cancel_seq);

		prepare_to_wait(&ctx->cq_wait, &wait, TASK_INTERRUPTIBLE);

		ret = __io_sync_cancel(current->io_uring, &cd, sc.fd);

		mutex_unlock(&ctx->uring_lock);
		if (ret != -EALREADY)
			break;

		ret = io_run_task_work_sig(ctx);
		if (ret < 0)
			break;
		ret = schedule_hrtimeout(&timeout, HRTIMER_MODE_ABS);
		if (!ret) {
			ret = -ETIME;
			break;
		}
		mutex_lock(&ctx->uring_lock);
	} while (1);

	finish_wait(&ctx->cq_wait, &wait);
	mutex_lock(&ctx->uring_lock);

	if (ret == -ENOENT || ret > 0)
		ret = 0;
out:
	fdput(f);
	return ret;
}
Commit	Line	Data
7aaff708 JA	1	// SPDX-License-Identifier: GPL-2.0
	2	#include <linux/kernel.h>
	3	#include <linux/errno.h>
	4	#include <linux/fs.h>
	5	#include <linux/file.h>
	6	#include <linux/mm.h>
	7	#include <linux/slab.h>
	8	#include <linux/namei.h>
78a861b9	9	#include <linux/nospec.h>
7aaff708 JA	10	#include <linux/io_uring.h>
	11
	12	#include <uapi/linux/io_uring.h>
	13
7aaff708 JA	14	#include "io_uring.h"
	15	#include "tctx.h"
	16	#include "poll.h"
	17	#include "timeout.h"
	18	#include "cancel.h"
	19
	20	struct io_cancel {
	21	struct file *file;
	22	u64 addr;
	23	u32 flags;
	24	s32 fd;
d7b8b079	25	u8 opcode;
7aaff708 JA	26	};
	27
	28	#define CANCEL_FLAGS (IORING_ASYNC_CANCEL_ALL \| IORING_ASYNC_CANCEL_FD \| \
8165b566	29	IORING_ASYNC_CANCEL_ANY \| IORING_ASYNC_CANCEL_FD_FIXED \| \
d7b8b079	30	IORING_ASYNC_CANCEL_USERDATA \| IORING_ASYNC_CANCEL_OP)
7aaff708	31
aa5cd116 JA	32	/*
	33	* Returns true if the request matches the criteria outlined by 'cd'.
	34	*/
	35	bool io_cancel_req_match(struct io_kiocb req, struct io_cancel_data cd)
7aaff708	36	{
8165b566 JA	37	bool match_user_data = cd->flags & IORING_ASYNC_CANCEL_USERDATA;
8165b566 JA	38
7aaff708 JA	39	if (req->ctx != cd->ctx)
7aaff708 JA	40	return false;
8165b566	41
d7b8b079	42	if (!(cd->flags & (IORING_ASYNC_CANCEL_FD \| IORING_ASYNC_CANCEL_OP)))
8165b566 JA	43	match_user_data = true;
	44
	45	if (cd->flags & IORING_ASYNC_CANCEL_ANY)
3a372b66	46	goto check_seq;
8165b566	47	if (cd->flags & IORING_ASYNC_CANCEL_FD) {
7aaff708 JA	48	if (req->file != cd->file)
7aaff708 JA	49	return false;
7aaff708	50	}
d7b8b079 JA	51	if (cd->flags & IORING_ASYNC_CANCEL_OP) {
	52	if (req->opcode != cd->opcode)
	53	return false;
	54	}
8165b566 JA	55	if (match_user_data && req->cqe.user_data != cd->data)
8165b566 JA	56	return false;
3a372b66 JA	57	if (cd->flags & IORING_ASYNC_CANCEL_ALL) {
3a372b66 JA	58	check_seq:
7aaff708 JA	59	if (cd->seq == req->work.cancel_seq)
	60	return false;
	61	req->work.cancel_seq = cd->seq;
	62	}
aa5cd116	63
7aaff708 JA	64	return true;
	65	}
	66
aa5cd116 JA	67	static bool io_cancel_cb(struct io_wq_work work, void data)
	68	{
	69	struct io_kiocb *req = container_of(work, struct io_kiocb, work);
	70	struct io_cancel_data *cd = data;
	71
	72	return io_cancel_req_match(req, cd);
	73	}
	74
7aaff708 JA	75	static int io_async_cancel_one(struct io_uring_task *tctx,
	76	struct io_cancel_data *cd)
	77	{
	78	enum io_wq_cancel cancel_ret;
	79	int ret = 0;
	80	bool all;
	81
	82	if (!tctx \|\| !tctx->io_wq)
	83	return -ENOENT;
	84
	85	all = cd->flags & (IORING_ASYNC_CANCEL_ALL\|IORING_ASYNC_CANCEL_ANY);
	86	cancel_ret = io_wq_cancel_cb(tctx->io_wq, io_cancel_cb, cd, all);
	87	switch (cancel_ret) {
	88	case IO_WQ_CANCEL_OK:
	89	ret = 0;
	90	break;
	91	case IO_WQ_CANCEL_RUNNING:
	92	ret = -EALREADY;
	93	break;
	94	case IO_WQ_CANCEL_NOTFOUND:
	95	ret = -ENOENT;
	96	break;
	97	}
	98
	99	return ret;
	100	}
	101
88f52eaa	102	int io_try_cancel(struct io_uring_task tctx, struct io_cancel_data cd,
5d7943d9	103	unsigned issue_flags)
7aaff708	104	{
88f52eaa	105	struct io_ring_ctx *ctx = cd->ctx;
7aaff708 JA	106	int ret;
7aaff708 JA	107
88f52eaa	108	WARN_ON_ONCE(!io_wq_current_is_worker() && tctx != current->io_uring);
7aaff708	109
88f52eaa	110	ret = io_async_cancel_one(tctx, cd);
7aaff708 JA	111	/*
	112	* Fall-through even for -EALREADY, as we may have poll armed
	113	* that need unarming.
	114	*/
	115	if (!ret)
	116	return 0;
	117
5d7943d9	118	ret = io_poll_cancel(ctx, cd, issue_flags);
7aaff708	119	if (ret != -ENOENT)
4dfab8ab PB	120	return ret;
4dfab8ab PB	121
38513c46	122	spin_lock(&ctx->completion_lock);
7aaff708 JA	123	if (!(cd->flags & IORING_ASYNC_CANCEL_FD))
7aaff708 JA	124	ret = io_timeout_cancel(ctx, cd);
7aaff708 JA	125	spin_unlock(&ctx->completion_lock);
	126	return ret;
	127	}
	128
7aaff708 JA	129	int io_async_cancel_prep(struct io_kiocb req, const struct io_uring_sqe sqe)
7aaff708 JA	130	{
f2ccb5ae	131	struct io_cancel *cancel = io_kiocb_to_cmd(req, struct io_cancel);
7aaff708 JA	132
	133	if (unlikely(req->flags & REQ_F_BUFFER_SELECT))
	134	return -EINVAL;
d7b8b079	135	if (sqe->off \|\| sqe->splice_fd_in)
7aaff708 JA	136	return -EINVAL;
	137
	138	cancel->addr = READ_ONCE(sqe->addr);
	139	cancel->flags = READ_ONCE(sqe->cancel_flags);
	140	if (cancel->flags & ~CANCEL_FLAGS)
	141	return -EINVAL;
	142	if (cancel->flags & IORING_ASYNC_CANCEL_FD) {
	143	if (cancel->flags & IORING_ASYNC_CANCEL_ANY)
	144	return -EINVAL;
	145	cancel->fd = READ_ONCE(sqe->fd);
	146	}
d7b8b079 JA	147	if (cancel->flags & IORING_ASYNC_CANCEL_OP) {
	148	if (cancel->flags & IORING_ASYNC_CANCEL_ANY)
	149	return -EINVAL;
	150	cancel->opcode = READ_ONCE(sqe->len);
	151	}
7aaff708 JA	152
	153	return 0;
	154	}
	155
88f52eaa JA	156	static int __io_async_cancel(struct io_cancel_data *cd,
88f52eaa JA	157	struct io_uring_task *tctx,
7aaff708 JA	158	unsigned int issue_flags)
	159	{
	160	bool all = cd->flags & (IORING_ASYNC_CANCEL_ALL\|IORING_ASYNC_CANCEL_ANY);
	161	struct io_ring_ctx *ctx = cd->ctx;
	162	struct io_tctx_node *node;
	163	int ret, nr = 0;
	164
	165	do {
88f52eaa	166	ret = io_try_cancel(tctx, cd, issue_flags);
7aaff708 JA	167	if (ret == -ENOENT)
	168	break;
	169	if (!all)
	170	return ret;
	171	nr++;
	172	} while (1);
	173
	174	/* slow path, try all io-wq's */
	175	io_ring_submit_lock(ctx, issue_flags);
	176	ret = -ENOENT;
	177	list_for_each_entry(node, &ctx->tctx_list, ctx_node) {
	178	struct io_uring_task *tctx = node->task->io_uring;
	179
	180	ret = io_async_cancel_one(tctx, cd);
	181	if (ret != -ENOENT) {
	182	if (!all)
	183	break;
	184	nr++;
	185	}
	186	}
	187	io_ring_submit_unlock(ctx, issue_flags);
	188	return all ? nr : ret;
	189	}
	190
	191	int io_async_cancel(struct io_kiocb *req, unsigned int issue_flags)
	192	{
f2ccb5ae	193	struct io_cancel *cancel = io_kiocb_to_cmd(req, struct io_cancel);
7aaff708 JA	194	struct io_cancel_data cd = {
	195	.ctx = req->ctx,
	196	.data = cancel->addr,
	197	.flags = cancel->flags,
d7b8b079	198	.opcode = cancel->opcode,
7aaff708 JA	199	.seq = atomic_inc_return(&req->ctx->cancel_seq),
7aaff708 JA	200	};
88f52eaa	201	struct io_uring_task *tctx = req->task->io_uring;
7aaff708 JA	202	int ret;
	203
	204	if (cd.flags & IORING_ASYNC_CANCEL_FD) {
7d8ca725 JA	205	if (req->flags & REQ_F_FIXED_FILE \|\|
	206	cd.flags & IORING_ASYNC_CANCEL_FD_FIXED) {
	207	req->flags \|= REQ_F_FIXED_FILE;
7aaff708 JA	208	req->file = io_file_get_fixed(req, cancel->fd,
7aaff708 JA	209	issue_flags);
7d8ca725	210	} else {
7aaff708	211	req->file = io_file_get_normal(req, cancel->fd);
7d8ca725	212	}
7aaff708 JA	213	if (!req->file) {
	214	ret = -EBADF;
	215	goto done;
	216	}
	217	cd.file = req->file;
	218	}
	219
88f52eaa	220	ret = __io_async_cancel(&cd, tctx, issue_flags);
7aaff708 JA	221	done:
	222	if (ret < 0)
	223	req_set_fail(req);
	224	io_req_set_res(req, ret, 0);
	225	return IOU_OK;
	226	}
38513c46	227
e6f89be6	228	void init_hash_table(struct io_hash_table *table, unsigned size)
38513c46 HX	229	{
	230	unsigned int i;
	231
	232	for (i = 0; i < size; i++) {
e6f89be6 PB	233	spin_lock_init(&table->hbs[i].lock);
e6f89be6 PB	234	INIT_HLIST_HEAD(&table->hbs[i].list);
38513c46 HX	235	}
38513c46 HX	236	}
78a861b9 JA	237
	238	static int __io_sync_cancel(struct io_uring_task *tctx,
	239	struct io_cancel_data *cd, int fd)
	240	{
	241	struct io_ring_ctx *ctx = cd->ctx;
	242
	243	/* fixed must be grabbed every time since we drop the uring_lock */
	244	if ((cd->flags & IORING_ASYNC_CANCEL_FD) &&
	245	(cd->flags & IORING_ASYNC_CANCEL_FD_FIXED)) {
47abea04	246	if (unlikely(fd >= ctx->nr_user_files))
78a861b9 JA	247	return -EBADF;
78a861b9 JA	248	fd = array_index_nospec(fd, ctx->nr_user_files);
60a666f0	249	cd->file = io_file_from_index(&ctx->file_table, fd);
78a861b9 JA	250	if (!cd->file)
	251	return -EBADF;
	252	}
	253
	254	return __io_async_cancel(cd, tctx, 0);
	255	}
	256
	257	int io_sync_cancel(struct io_ring_ctx ctx, void __user arg)
	258	__must_hold(&ctx->uring_lock)
	259	{
	260	struct io_cancel_data cd = {
	261	.ctx = ctx,
	262	.seq = atomic_inc_return(&ctx->cancel_seq),
	263	};
	264	ktime_t timeout = KTIME_MAX;
	265	struct io_uring_sync_cancel_reg sc;
	266	struct fd f = { };
	267	DEFINE_WAIT(wait);
	268	int ret;
	269
	270	if (copy_from_user(&sc, arg, sizeof(sc)))
	271	return -EFAULT;
	272	if (sc.flags & ~CANCEL_FLAGS)
	273	return -EINVAL;
	274	if (sc.pad[0] \|\| sc.pad[1] \|\| sc.pad[2] \|\| sc.pad[3])
	275	return -EINVAL;
	276
	277	cd.data = sc.addr;
	278	cd.flags = sc.flags;
	279
	280	/* we can grab a normal file descriptor upfront */
	281	if ((cd.flags & IORING_ASYNC_CANCEL_FD) &&
	282	!(cd.flags & IORING_ASYNC_CANCEL_FD_FIXED)) {
	283	f = fdget(sc.fd);
	284	if (!f.file)
	285	return -EBADF;
	286	cd.file = f.file;
	287	}
	288
	289	ret = __io_sync_cancel(current->io_uring, &cd, sc.fd);
	290
	291	/* found something, done! */
	292	if (ret != -EALREADY)
	293	goto out;
	294
	295	if (sc.timeout.tv_sec != -1UL \|\| sc.timeout.tv_nsec != -1UL) {
	296	struct timespec64 ts = {
	297	.tv_sec = sc.timeout.tv_sec,
	298	.tv_nsec = sc.timeout.tv_nsec
	299	};
	300
	301	timeout = ktime_add_ns(timespec64_to_ktime(ts), ktime_get_ns());
	302	}
	303
	304	/*
	305	* Keep looking until we get -ENOENT. we'll get woken everytime
	306	* every time a request completes and will retry the cancelation.
	307	*/
	308	do {
	309	cd.seq = atomic_inc_return(&ctx->cancel_seq);
	310
	311	prepare_to_wait(&ctx->cq_wait, &wait, TASK_INTERRUPTIBLE);
	312
	313	ret = __io_sync_cancel(current->io_uring, &cd, sc.fd);
314
23fffb2f	315	mutex_unlock(&ctx->uring_lock);
78a861b9 JA	316	if (ret != -EALREADY)
	317	break;
	318
c0e0d6ba	319	ret = io_run_task_work_sig(ctx);
23fffb2f	320	if (ret < 0)
78a861b9	321	break;
78a861b9	322	ret = schedule_hrtimeout(&timeout, HRTIMER_MODE_ABS);
78a861b9 JA	323	if (!ret) {
	324	ret = -ETIME;
	325	break;
	326	}
23fffb2f	327	mutex_lock(&ctx->uring_lock);
78a861b9 JA	328	} while (1);
	329
	330	finish_wait(&ctx->cq_wait, &wait);
23fffb2f	331	mutex_lock(&ctx->uring_lock);
78a861b9 JA	332
	333	if (ret == -ENOENT \|\| ret > 0)
	334	ret = 0;
	335	out:
	336	fdput(f);
	337	return ret;
	338	}