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io_uring: add support for IORING_OP_SYNC_FILE_RANGE 

This behaves just like sync_file_range(2) does.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
hifive-unleashed-5.2
Jens Axboe 2019-04-09 14:56:44 -06:00
parent 22f96b3808
commit 5d17b4a4b7
2 changed files with 53 additions and 0 deletions
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51
fs/io_uring.c
View File

@ -1267,6 +1267,54 @@ static int io_fsync(struct io_kiocb *req, const struct io_uring_sqe *sqe,
return 0;
}
static int io_prep_sfr(struct io_kiocb *req, const struct io_uring_sqe *sqe)
{
struct io_ring_ctx *ctx = req->ctx;
int ret = 0;
if (!req->file)
return -EBADF;
/* Prep already done (EAGAIN retry) */
if (req->flags & REQ_F_PREPPED)
return 0;
if (unlikely(ctx->flags & IORING_SETUP_IOPOLL))
return -EINVAL;
if (unlikely(sqe->addr || sqe->ioprio || sqe->buf_index))
return -EINVAL;
req->flags |= REQ_F_PREPPED;
return ret;
}
static int io_sync_file_range(struct io_kiocb *req,
const struct io_uring_sqe *sqe,
bool force_nonblock)
{
loff_t sqe_off;
loff_t sqe_len;
unsigned flags;
int ret;
ret = io_prep_sfr(req, sqe);
if (ret)
return ret;
/* sync_file_range always requires a blocking context */
if (force_nonblock)
return -EAGAIN;
sqe_off = READ_ONCE(sqe->off);
sqe_len = READ_ONCE(sqe->len);
flags = READ_ONCE(sqe->sync_range_flags);
ret = sync_file_range(req->rw.ki_filp, sqe_off, sqe_len, flags);
io_cqring_add_event(req->ctx, sqe->user_data, ret, 0);
io_put_req(req);
return 0;
}
static void io_poll_remove_one(struct io_kiocb *req)
{
struct io_poll_iocb *poll = &req->poll;
@ -1549,6 +1597,9 @@ static int __io_submit_sqe(struct io_ring_ctx *ctx, struct io_kiocb *req,
case IORING_OP_POLL_REMOVE:
ret = io_poll_remove(req, s->sqe);
break;
case IORING_OP_SYNC_FILE_RANGE:
ret = io_sync_file_range(req, s->sqe, force_nonblock);
break;
default:
ret = -EINVAL;
break;

2
include/uapi/linux/io_uring.h
View File

@ -26,6 +26,7 @@ struct io_uring_sqe {
__kernel_rwf_t rw_flags;
__u32 fsync_flags;
__u16 poll_events;
__u32 sync_range_flags;
};
__u64 user_data; /* data to be passed back at completion time */
union {
@ -55,6 +56,7 @@ struct io_uring_sqe {
#define IORING_OP_WRITE_FIXED 5
#define IORING_OP_POLL_ADD 6
#define IORING_OP_POLL_REMOVE 7
#define IORING_OP_SYNC_FILE_RANGE 8
/*
* sqe->fsync_flags