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io_uring: add IORING_OP_MADVISE

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This adds support for doing madvise(2) through io_uring. We assume that
any operation can block, and hence punt everything async. This could be
improved, but hard to make bullet proof. The async punt ensures it's
safe.

Reviewed-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2019-12-25 22:18:28 -07:00
parent db08ca2525
commit c1ca757bd6
2 changed files with 60 additions and 0 deletions
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59
fs/io_uring.c
View File

@ -408,6 +408,13 @@ struct io_fadvise {
u32 advice;
};
struct io_madvise {
struct file *file;
u64 addr;
u32 len;
u32 advice;
};
struct io_async_connect {
struct sockaddr_storage address;
};
@ -461,6 +468,7 @@ struct io_kiocb {
struct io_close close;
struct io_files_update files_update;
struct io_fadvise fadvise;
struct io_madvise madvise;
};
struct io_async_ctx *io;
@ -680,6 +688,10 @@ static const struct io_op_def io_op_defs[] = {
/* IORING_OP_FADVISE */
.needs_file = 1,
},
{
/* IORING_OP_MADVISE */
.needs_mm = 1,
},
};
static void io_wq_submit_work(struct io_wq_work **workptr);
@ -2449,6 +2461,42 @@ static int io_openat(struct io_kiocb *req, struct io_kiocb **nxt,
return 0;
}
static int io_madvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
{
#if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU)
if (sqe->ioprio || sqe->buf_index || sqe->off)
return -EINVAL;
req->madvise.addr = READ_ONCE(sqe->addr);
req->madvise.len = READ_ONCE(sqe->len);
req->madvise.advice = READ_ONCE(sqe->fadvise_advice);
return 0;
#else
return -EOPNOTSUPP;
#endif
}
static int io_madvise(struct io_kiocb *req, struct io_kiocb **nxt,
bool force_nonblock)
{
#if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU)
struct io_madvise *ma = &req->madvise;
int ret;
if (force_nonblock)
return -EAGAIN;
ret = do_madvise(ma->addr, ma->len, ma->advice);
if (ret < 0)
req_set_fail_links(req);
io_cqring_add_event(req, ret);
io_put_req_find_next(req, nxt);
return 0;
#else
return -EOPNOTSUPP;
#endif
}
static int io_fadvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
{
if (sqe->ioprio || sqe->buf_index || sqe->addr)
@ -3766,6 +3814,9 @@ static int io_req_defer_prep(struct io_kiocb *req,
case IORING_OP_FADVISE:
ret = io_fadvise_prep(req, sqe);
break;
case IORING_OP_MADVISE:
ret = io_madvise_prep(req, sqe);
break;
default:
printk_once(KERN_WARNING "io_uring: unhandled opcode %d\n",
req->opcode);
@ -3970,6 +4021,14 @@ static int io_issue_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe,
}
ret = io_fadvise(req, nxt, force_nonblock);
break;
case IORING_OP_MADVISE:
if (sqe) {
ret = io_madvise_prep(req, sqe);
if (ret)
break;
}
ret = io_madvise(req, nxt, force_nonblock);
break;
default:
ret = -EINVAL;
break;

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

@ -88,6 +88,7 @@ enum {
IORING_OP_READ,
IORING_OP_WRITE,
IORING_OP_FADVISE,
IORING_OP_MADVISE,
/* this goes last, obviously */
IORING_OP_LAST,