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io_uring: add IORING_OP_PROVIDE_BUFFERS

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IORING_OP_PROVIDE_BUFFERS uses the buffer registration infrastructure to
support passing in an addr/len that is associated with a buffer ID and
buffer group ID. The group ID is used to index and lookup the buffers,
while the buffer ID can be used to notify the application which buffer
in the group was used. The addr passed in is the starting buffer address,
and length is each buffer length. A number of buffers to add with can be
specified, in which case addr is incremented by length for each addition,
and each buffer increments the buffer ID specified.

No validation is done of the buffer ID. If the application provides
buffers within the same group with identical buffer IDs, then it'll have
a hard time telling which buffer ID was used. The only restriction is
that the buffer ID can be a max of 16-bits in size, so USHRT_MAX is the
maximum ID that can be used.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2020-02-23 16:41:33 -07:00
parent 5a2e745d4d
commit ddf0322db7
2 changed files with 145 additions and 3 deletions
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138
fs/io_uring.c
View File

@ -447,6 +447,15 @@ struct io_splice {
unsigned int flags;
};
struct io_provide_buf {
struct file *file;
__u64 addr;
__s32 len;
__u32 bgid;
__u16 nbufs;
__u16 bid;
};
struct io_async_connect {
struct sockaddr_storage address;
};
@ -572,6 +581,7 @@ struct io_kiocb {
struct io_madvise madvise;
struct io_epoll epoll;
struct io_splice splice;
struct io_provide_buf pbuf;
};
struct io_async_ctx *io;
@ -799,7 +809,8 @@ static const struct io_op_def io_op_defs[] = {
.needs_file = 1,
.hash_reg_file = 1,
.unbound_nonreg_file = 1,
}
},
[IORING_OP_PROVIDE_BUFFERS] = {},
};
static void io_wq_submit_work(struct io_wq_work **workptr);
@ -2785,6 +2796,120 @@ static int io_openat(struct io_kiocb *req, bool force_nonblock)
return io_openat2(req, force_nonblock);
}
static int io_provide_buffers_prep(struct io_kiocb *req,
const struct io_uring_sqe *sqe)
{
struct io_provide_buf *p = &req->pbuf;
u64 tmp;
if (sqe->ioprio || sqe->rw_flags)
return -EINVAL;
tmp = READ_ONCE(sqe->fd);
if (!tmp || tmp > USHRT_MAX)
return -E2BIG;
p->nbufs = tmp;
p->addr = READ_ONCE(sqe->addr);
p->len = READ_ONCE(sqe->len);
if (!access_ok(u64_to_user_ptr(p->addr), p->len))
return -EFAULT;
p->bgid = READ_ONCE(sqe->buf_group);
tmp = READ_ONCE(sqe->off);
if (tmp > USHRT_MAX)
return -E2BIG;
p->bid = tmp;
return 0;
}
static int io_add_buffers(struct io_provide_buf *pbuf, struct io_buffer **head)
{
struct io_buffer *buf;
u64 addr = pbuf->addr;
int i, bid = pbuf->bid;
for (i = 0; i < pbuf->nbufs; i++) {
buf = kmalloc(sizeof(*buf), GFP_KERNEL);
if (!buf)
break;
buf->addr = addr;
buf->len = pbuf->len;
buf->bid = bid;
addr += pbuf->len;
bid++;
if (!*head) {
INIT_LIST_HEAD(&buf->list);
*head = buf;
} else {
list_add_tail(&buf->list, &(*head)->list);
}
}
return i ? i : -ENOMEM;
}
static void io_ring_submit_unlock(struct io_ring_ctx *ctx, bool needs_lock)
{
if (needs_lock)
mutex_unlock(&ctx->uring_lock);
}
static void io_ring_submit_lock(struct io_ring_ctx *ctx, bool needs_lock)
{
/*
* "Normal" inline submissions always hold the uring_lock, since we
* grab it from the system call. Same is true for the SQPOLL offload.
* The only exception is when we've detached the request and issue it
* from an async worker thread, grab the lock for that case.
*/
if (needs_lock)
mutex_lock(&ctx->uring_lock);
}
static int io_provide_buffers(struct io_kiocb *req, bool force_nonblock)
{
struct io_provide_buf *p = &req->pbuf;
struct io_ring_ctx *ctx = req->ctx;
struct io_buffer *head, *list;
int ret = 0;
io_ring_submit_lock(ctx, !force_nonblock);
lockdep_assert_held(&ctx->uring_lock);
list = head = idr_find(&ctx->io_buffer_idr, p->bgid);
ret = io_add_buffers(p, &head);
if (ret < 0)
goto out;
if (!list) {
ret = idr_alloc(&ctx->io_buffer_idr, head, p->bgid, p->bgid + 1,
GFP_KERNEL);
if (ret < 0) {
while (!list_empty(&head->list)) {
struct io_buffer *buf;
buf = list_first_entry(&head->list,
struct io_buffer, list);
list_del(&buf->list);
kfree(buf);
}
kfree(head);
goto out;
}
}
out:
io_ring_submit_unlock(ctx, !force_nonblock);
if (ret < 0)
req_set_fail_links(req);
io_cqring_add_event(req, ret);
io_put_req(req);
return 0;
}
static int io_epoll_ctl_prep(struct io_kiocb *req,
const struct io_uring_sqe *sqe)
{
@ -4392,6 +4517,9 @@ static int io_req_defer_prep(struct io_kiocb *req,
case IORING_OP_SPLICE:
ret = io_splice_prep(req, sqe);
break;
case IORING_OP_PROVIDE_BUFFERS:
ret = io_provide_buffers_prep(req, sqe);
break;
default:
printk_once(KERN_WARNING "io_uring: unhandled opcode %d\n",
req->opcode);
@ -4669,6 +4797,14 @@ static int io_issue_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe,
}
ret = io_splice(req, force_nonblock);
break;
case IORING_OP_PROVIDE_BUFFERS:
if (sqe) {
ret = io_provide_buffers_prep(req, sqe);
if (ret)
break;
}
ret = io_provide_buffers(req, force_nonblock);
break;
default:
ret = -EINVAL;
break;

10
include/uapi/linux/io_uring.h
View File

@ -45,8 +45,13 @@ struct io_uring_sqe {
__u64 user_data; /* data to be passed back at completion time */
union {
struct {
/* index into fixed buffers, if used */
__u16 buf_index;
/* pack this to avoid bogus arm OABI complaints */
union {
/* index into fixed buffers, if used */
__u16 buf_index;
/* for grouped buffer selection */
__u16 buf_group;
} __attribute__((packed));
/* personality to use, if used */
__u16 personality;
__s32 splice_fd_in;
@ -119,6 +124,7 @@ enum {
IORING_OP_OPENAT2,
IORING_OP_EPOLL_CTL,
IORING_OP_SPLICE,
IORING_OP_PROVIDE_BUFFERS,
/* this goes last, obviously */
IORING_OP_LAST,