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io_uring: add support for shutdown(2)

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This adds support for the shutdown(2) system call, which is useful for
dealing with sockets.

shutdown(2) may block, so we have to punt it to async context.

Suggested-by: Norman Maurer <norman.maurer@googlemail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2020-09-05 11:14:22 -06:00
parent b713c195d5
commit 36f4fa6886
2 changed files with 53 additions and 0 deletions
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52
fs/io_uring.c
View file

@ -541,6 +541,11 @@ struct io_statx {
struct statx __user *buffer;
};
struct io_shutdown {
struct file *file;
int how;
};
struct io_completion {
struct file *file;
struct list_head list;
@ -667,6 +672,7 @@ struct io_kiocb {
struct io_splice splice;
struct io_provide_buf pbuf;
struct io_statx statx;
struct io_shutdown shutdown;
/* use only after cleaning per-op data, see io_clean_op() */
struct io_completion compl;
};
@ -934,6 +940,9 @@ static const struct io_op_def io_op_defs[] = {
.hash_reg_file = 1,
.unbound_nonreg_file = 1,
},
[IORING_OP_SHUTDOWN] = {
.needs_file = 1,
},
};
enum io_mem_account {
@ -3591,6 +3600,44 @@ static int io_write(struct io_kiocb *req, bool force_nonblock,
return ret;
}
static int io_shutdown_prep(struct io_kiocb *req,
const struct io_uring_sqe *sqe)
{
#if defined(CONFIG_NET)
if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL))
return -EINVAL;
if (sqe->ioprio || sqe->off || sqe->addr || sqe->rw_flags ||
sqe->buf_index)
return -EINVAL;
req->shutdown.how = READ_ONCE(sqe->len);
return 0;
#else
return -EOPNOTSUPP;
#endif
}
static int io_shutdown(struct io_kiocb *req, bool force_nonblock)
{
#if defined(CONFIG_NET)
struct socket *sock;
int ret;
if (force_nonblock)
return -EAGAIN;
sock = sock_from_file(req->file, &ret);
if (unlikely(!sock))
return ret;
ret = __sys_shutdown_sock(sock, req->shutdown.how);
io_req_complete(req, ret);
return 0;
#else
return -EOPNOTSUPP;
#endif
}
static int __io_splice_prep(struct io_kiocb *req,
const struct io_uring_sqe *sqe)
{
@ -5775,6 +5822,8 @@ static int io_req_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
return io_remove_buffers_prep(req, sqe);
case IORING_OP_TEE:
return io_tee_prep(req, sqe);
case IORING_OP_SHUTDOWN:
return io_shutdown_prep(req, sqe);
}
printk_once(KERN_WARNING "io_uring: unhandled opcode %d\n",
@ -6018,6 +6067,9 @@ static int io_issue_sqe(struct io_kiocb *req, bool force_nonblock,
case IORING_OP_TEE:
ret = io_tee(req, force_nonblock);
break;
case IORING_OP_SHUTDOWN:
ret = io_shutdown(req, force_nonblock);
break;
default:
ret = -EINVAL;
break;

1
include/uapi/linux/io_uring.h
View file

@ -132,6 +132,7 @@ enum {
IORING_OP_PROVIDE_BUFFERS,
IORING_OP_REMOVE_BUFFERS,
IORING_OP_TEE,
IORING_OP_SHUTDOWN,
/* this goes last, obviously */
IORING_OP_LAST,