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io_uring: add support for IORING_OP_OPENAT2

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Add support for the new openat2(2) system call. It's trivial to do, as
we can have openat(2) just be wrapped around it.

Suggested-by: Stefan Metzmacher <metze@samba.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2020-01-08 17:59:24 -07:00
parent f8748881b1
commit cebdb98617
2 changed files with 64 additions and 6 deletions
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69
fs/io_uring.c
View File

@ -707,6 +707,11 @@ static const struct io_op_def io_op_defs[] = {
.needs_file = 1,
.unbound_nonreg_file = 1,
},
{
/* IORING_OP_OPENAT2 */
.needs_file = 1,
.fd_non_neg = 1,
},
};
static void io_wq_submit_work(struct io_wq_work **workptr);
@ -2487,11 +2492,46 @@ static int io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
return 0;
}
static int io_openat(struct io_kiocb *req, struct io_kiocb **nxt,
bool force_nonblock)
static int io_openat2_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
{
struct open_how __user *how;
const char __user *fname;
size_t len;
int ret;
if (sqe->ioprio || sqe->buf_index)
return -EINVAL;
req->open.dfd = READ_ONCE(sqe->fd);
fname = u64_to_user_ptr(READ_ONCE(sqe->addr));
how = u64_to_user_ptr(READ_ONCE(sqe->addr2));
len = READ_ONCE(sqe->len);
if (len < OPEN_HOW_SIZE_VER0)
return -EINVAL;
ret = copy_struct_from_user(&req->open.how, sizeof(req->open.how), how,
len);
if (ret)
return ret;
if (!(req->open.how.flags & O_PATH) && force_o_largefile())
req->open.how.flags |= O_LARGEFILE;
req->open.filename = getname(fname);
if (IS_ERR(req->open.filename)) {
ret = PTR_ERR(req->open.filename);
req->open.filename = NULL;
return ret;
}
return 0;
}
static int io_openat2(struct io_kiocb *req, struct io_kiocb **nxt,
bool force_nonblock)
{
struct open_flags op;
struct open_how how;
struct file *file;
int ret;
@ -2500,12 +2540,11 @@ static int io_openat(struct io_kiocb *req, struct io_kiocb **nxt,
return -EAGAIN;
}
how = build_open_how(req->open.how.flags, req->open.how.mode);
ret = build_open_flags(&how, &op);
ret = build_open_flags(&req->open.how, &op);
if (ret)
goto err;
ret = get_unused_fd_flags(how.flags);
ret = get_unused_fd_flags(req->open.how.flags);
if (ret < 0)
goto err;
@ -2526,6 +2565,13 @@ err:
return 0;
}
static int io_openat(struct io_kiocb *req, struct io_kiocb **nxt,
bool force_nonblock)
{
req->open.how = build_open_how(req->open.how.flags, req->open.how.mode);
return io_openat2(req, nxt, force_nonblock);
}
static int io_madvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
{
#if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU)
@ -3984,6 +4030,9 @@ static int io_req_defer_prep(struct io_kiocb *req,
case IORING_OP_MADVISE:
ret = io_madvise_prep(req, sqe);
break;
case IORING_OP_OPENAT2:
ret = io_openat2_prep(req, sqe);
break;
default:
printk_once(KERN_WARNING "io_uring: unhandled opcode %d\n",
req->opcode);
@ -4204,6 +4253,14 @@ static int io_issue_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe,
}
ret = io_madvise(req, nxt, force_nonblock);
break;
case IORING_OP_OPENAT2:
if (sqe) {
ret = io_openat2_prep(req, sqe);
if (ret)
break;
}
ret = io_openat2(req, nxt, force_nonblock);
break;
default:
ret = -EINVAL;
break;

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

@ -92,6 +92,7 @@ enum {
IORING_OP_MADVISE,
IORING_OP_SEND,
IORING_OP_RECV,
IORING_OP_OPENAT2,
/* this goes last, obviously */
IORING_OP_LAST,