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io_uring: add IORING_OP_FADVISE 

This adds support for doing fadvise through io_uring. We assume that
WILLNEED doesn't block, but that DONTNEED may block.

Reviewed-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
alistair/sensors
Jens Axboe 2019-12-25 22:03:45 -07:00
parent ba04291eb6
commit 4840e418c2
2 changed files with 55 additions and 0 deletions
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53
fs/io_uring.c
View File

@ -72,6 +72,7 @@
#include <linux/highmem.h>
#include <linux/namei.h>
#include <linux/fsnotify.h>
#include <linux/fadvise.h>
#define CREATE_TRACE_POINTS
#include <trace/events/io_uring.h>
@ -400,6 +401,13 @@ struct io_files_update {
u32 offset;
};
struct io_fadvise {
struct file *file;
u64 offset;
u32 len;
u32 advice;
};
struct io_async_connect {
struct sockaddr_storage address;
};
@ -452,6 +460,7 @@ struct io_kiocb {
struct io_open open;
struct io_close close;
struct io_files_update files_update;
struct io_fadvise fadvise;
};
struct io_async_ctx *io;
@ -667,6 +676,10 @@ static const struct io_op_def io_op_defs[] = {
.needs_file = 1,
.unbound_nonreg_file = 1,
},
{
/* IORING_OP_FADVISE */
.needs_file = 1,
},
};
static void io_wq_submit_work(struct io_wq_work **workptr);
@ -2436,6 +2449,35 @@ err:
return 0;
}
static int io_fadvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
{
if (sqe->ioprio || sqe->buf_index || sqe->addr)
return -EINVAL;
req->fadvise.offset = READ_ONCE(sqe->off);
req->fadvise.len = READ_ONCE(sqe->len);
req->fadvise.advice = READ_ONCE(sqe->fadvise_advice);
return 0;
}
static int io_fadvise(struct io_kiocb *req, struct io_kiocb **nxt,
bool force_nonblock)
{
struct io_fadvise *fa = &req->fadvise;
int ret;
/* DONTNEED may block, others _should_ not */
if (fa->advice == POSIX_FADV_DONTNEED && force_nonblock)
return -EAGAIN;
ret = vfs_fadvise(req->file, fa->offset, fa->len, fa->advice);
if (ret < 0)
req_set_fail_links(req);
io_cqring_add_event(req, ret);
io_put_req_find_next(req, nxt);
return 0;
}
static int io_statx_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
{
unsigned lookup_flags;
@ -3721,6 +3763,9 @@ static int io_req_defer_prep(struct io_kiocb *req,
case IORING_OP_STATX:
ret = io_statx_prep(req, sqe);
break;
case IORING_OP_FADVISE:
ret = io_fadvise_prep(req, sqe);
break;
default:
printk_once(KERN_WARNING "io_uring: unhandled opcode %d\n",
req->opcode);
@ -3917,6 +3962,14 @@ static int io_issue_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe,
}
ret = io_statx(req, nxt, force_nonblock);
break;
case IORING_OP_FADVISE:
if (sqe) {
ret = io_fadvise_prep(req, sqe);
if (ret)
break;
}
ret = io_fadvise(req, nxt, force_nonblock);
break;
default:
ret = -EINVAL;
break;

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

@ -36,6 +36,7 @@ struct io_uring_sqe {
__u32 cancel_flags;
__u32 open_flags;
__u32 statx_flags;
__u32 fadvise_advice;
};
__u64 user_data; /* data to be passed back at completion time */
union {
@ -86,6 +87,7 @@ enum {
IORING_OP_STATX,
IORING_OP_READ,
IORING_OP_WRITE,
IORING_OP_FADVISE,
/* this goes last, obviously */
IORING_OP_LAST,