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io_uring/notif: remove notif registration

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We're going to remove the userspace exposed zerocopy notification API,
remove notification registration.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/6ff00b97be99869c386958a990593c9c31cf105b.1662027856.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2022-09-01 11:54:03 +01:00 committed by Jens Axboe
parent d9808ceb31
commit 57f332246a
5 changed files with 1 additions and 103 deletions
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8
include/uapi/linux/io_uring.h
View file

@ -279,14 +279,10 @@ enum io_uring_op {
*
* IORING_RECVSEND_FIXED_BUF Use registered buffers, the index is stored in
* the buf_index field.
*
* IORING_RECVSEND_NOTIF_FLUSH Flush a notification after a successful
* successful. Only for zerocopy sends.
*/
#define IORING_RECVSEND_POLL_FIRST (1U << 0)
#define IORING_RECV_MULTISHOT (1U << 1)
#define IORING_RECVSEND_FIXED_BUF (1U << 2)
#define IORING_RECVSEND_NOTIF_FLUSH (1U << 3)
/*
* accept flags stored in sqe->ioprio
@ -474,10 +470,6 @@ enum {
/* register a range of fixed file slots for automatic slot allocation */
IORING_REGISTER_FILE_ALLOC_RANGE = 25,
/* zerocopy notification API */
IORING_REGISTER_NOTIFIERS = 26,
IORING_UNREGISTER_NOTIFIERS = 27,
/* this goes last */
IORING_REGISTER_LAST
};

10
io_uring/io_uring.c
View file

@ -2640,7 +2640,6 @@ static __cold void io_ring_ctx_wait_and_kill(struct io_ring_ctx *ctx)
io_unregister_personality(ctx, index);
if (ctx->rings)
io_poll_remove_all(ctx, NULL, true);
io_notif_unregister(ctx);
mutex_unlock(&ctx->uring_lock);
/* failed during ring init, it couldn't have issued any requests */
@ -3839,15 +3838,6 @@ static int __io_uring_register(struct io_ring_ctx *ctx, unsigned opcode,
break;
ret = io_register_file_alloc_range(ctx, arg);
break;
case IORING_REGISTER_NOTIFIERS:
ret = io_notif_register(ctx, arg, nr_args);
break;
case IORING_UNREGISTER_NOTIFIERS:
ret = -EINVAL;
if (arg || nr_args)
break;
ret = io_notif_unregister(ctx);
break;
default:
ret = -EINVAL;
break;

4
io_uring/net.c
View file

@ -889,7 +889,7 @@ int io_sendzc_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
zc->flags = READ_ONCE(sqe->ioprio);
if (zc->flags & ~(IORING_RECVSEND_POLL_FIRST |
IORING_RECVSEND_FIXED_BUF | IORING_RECVSEND_NOTIF_FLUSH))
IORING_RECVSEND_FIXED_BUF))
return -EINVAL;
if (zc->flags & IORING_RECVSEND_FIXED_BUF) {
unsigned idx = READ_ONCE(sqe->buf_index);
@ -1063,8 +1063,6 @@ int io_sendzc(struct io_kiocb *req, unsigned int issue_flags)
if (ret == -ERESTARTSYS)
ret = -EINTR;
req_set_fail(req);
} else if (zc->flags & IORING_RECVSEND_NOTIF_FLUSH) {
io_notif_slot_flush_submit(notif_slot, 0);
}
if (ret >= 0)

71
io_uring/notif.c
View file

@ -86,74 +86,3 @@ void io_notif_slot_flush(struct io_notif_slot *slot)
io_req_task_work_add(notif);
}
}
__cold int io_notif_unregister(struct io_ring_ctx *ctx)
__must_hold(&ctx->uring_lock)
{
int i;
if (!ctx->notif_slots)
return -ENXIO;
for (i = 0; i < ctx->nr_notif_slots; i++) {
struct io_notif_slot *slot = &ctx->notif_slots[i];
struct io_kiocb *notif = slot->notif;
struct io_notif_data *nd;
if (!notif)
continue;
nd = io_notif_to_data(notif);
slot->notif = NULL;
if (!refcount_dec_and_test(&nd->uarg.refcnt))
continue;
notif->io_task_work.func = __io_notif_complete_tw;
io_req_task_work_add(notif);
}
kvfree(ctx->notif_slots);
ctx->notif_slots = NULL;
ctx->nr_notif_slots = 0;
return 0;
}
__cold int io_notif_register(struct io_ring_ctx *ctx,
void __user *arg, unsigned int size)
__must_hold(&ctx->uring_lock)
{
struct io_uring_notification_slot __user *slots;
struct io_uring_notification_slot slot;
struct io_uring_notification_register reg;
unsigned i;
if (ctx->nr_notif_slots)
return -EBUSY;
if (size != sizeof(reg))
return -EINVAL;
if (copy_from_user(&reg, arg, sizeof(reg)))
return -EFAULT;
if (!reg.nr_slots || reg.nr_slots > IORING_MAX_NOTIF_SLOTS)
return -EINVAL;
if (reg.resv || reg.resv2 || reg.resv3)
return -EINVAL;
slots = u64_to_user_ptr(reg.data);
ctx->notif_slots = kvcalloc(reg.nr_slots, sizeof(ctx->notif_slots[0]),
GFP_KERNEL_ACCOUNT);
if (!ctx->notif_slots)
return -ENOMEM;
for (i = 0; i < reg.nr_slots; i++, ctx->nr_notif_slots++) {
struct io_notif_slot *notif_slot = &ctx->notif_slots[i];
if (copy_from_user(&slot, &slots[i], sizeof(slot))) {
io_notif_unregister(ctx);
return -EFAULT;
}
if (slot.resv[0] | slot.resv[1] | slot.resv[2]) {
io_notif_unregister(ctx);
return -EINVAL;
}
notif_slot->tag = slot.tag;
}
return 0;
}

11
io_uring/notif.h
View file

@ -8,7 +8,6 @@
#include "rsrc.h"
#define IO_NOTIF_SPLICE_BATCH 32
#define IORING_MAX_NOTIF_SLOTS (1U << 15)
struct io_notif_data {
struct file *file;
@ -36,10 +35,6 @@ struct io_notif_slot {
u32 seq;
};
int io_notif_register(struct io_ring_ctx *ctx,
void __user *arg, unsigned int size);
int io_notif_unregister(struct io_ring_ctx *ctx);
void io_notif_slot_flush(struct io_notif_slot *slot);
struct io_kiocb *io_alloc_notif(struct io_ring_ctx *ctx,
struct io_notif_slot *slot);
@ -67,12 +62,6 @@ static inline struct io_notif_slot *io_get_notif_slot(struct io_ring_ctx *ctx,
return &ctx->notif_slots[idx];
}
static inline void io_notif_slot_flush_submit(struct io_notif_slot *slot,
unsigned int issue_flags)
{
io_notif_slot_flush(slot);
}
static inline int io_notif_account_mem(struct io_kiocb *notif, unsigned len)
{
struct io_ring_ctx *ctx = notif->ctx;