From: Jens Axboe <[email protected]>
To: [email protected]
Cc: Jens Axboe <[email protected]>
Subject: [PATCH 08/11] io_uring: make IORING_OP_CANCEL_ASYNC deferrable
Date: Tue, 17 Dec 2019 20:27:56 -0700 [thread overview]
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
If we defer this command as part of a link, we have to make sure that
the SQE data has been read upfront. Integrate the async cancel op into
the prep handling to make it safe for SQE reuse.
Signed-off-by: Jens Axboe <[email protected]>
---
fs/io_uring.c | 32 ++++++++++++++++++++++++++++----
1 file changed, 28 insertions(+), 4 deletions(-)
diff --git a/fs/io_uring.c b/fs/io_uring.c
index 0ce91165d918..bee98f6281fa 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -321,6 +321,11 @@ struct io_sync {
int flags;
};
+struct io_cancel {
+ struct file *file;
+ u64 addr;
+};
+
struct io_async_connect {
struct sockaddr_storage address;
};
@@ -363,6 +368,7 @@ struct io_kiocb {
struct io_poll_iocb poll;
struct io_accept accept;
struct io_sync sync;
+ struct io_cancel cancel;
};
const struct io_uring_sqe *sqe;
@@ -3013,18 +3019,33 @@ static void io_async_find_and_cancel(struct io_ring_ctx *ctx,
io_put_req_find_next(req, nxt);
}
-static int io_async_cancel(struct io_kiocb *req, struct io_kiocb **nxt)
+static int io_async_cancel_prep(struct io_kiocb *req)
{
const struct io_uring_sqe *sqe = req->sqe;
- struct io_ring_ctx *ctx = req->ctx;
- if (unlikely(ctx->flags & IORING_SETUP_IOPOLL))
+ if (req->flags & REQ_F_PREPPED)
+ return 0;
+ if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL))
return -EINVAL;
if (sqe->flags || sqe->ioprio || sqe->off || sqe->len ||
sqe->cancel_flags)
return -EINVAL;
- io_async_find_and_cancel(ctx, req, READ_ONCE(sqe->addr), nxt, 0);
+ req->flags |= REQ_F_PREPPED;
+ req->cancel.addr = READ_ONCE(sqe->addr);
+ return 0;
+}
+
+static int io_async_cancel(struct io_kiocb *req, struct io_kiocb **nxt)
+{
+ struct io_ring_ctx *ctx = req->ctx;
+ int ret;
+
+ ret = io_async_cancel_prep(req);
+ if (ret)
+ return ret;
+
+ io_async_find_and_cancel(ctx, req, req->cancel.addr, nxt, 0);
return 0;
}
@@ -3082,6 +3103,9 @@ static int io_req_defer_prep(struct io_kiocb *req)
case IORING_OP_TIMEOUT:
ret = io_timeout_prep(req, io, false);
break;
+ case IORING_OP_ASYNC_CANCEL:
+ ret = io_async_cancel_prep(req);
+ break;
case IORING_OP_LINK_TIMEOUT:
ret = io_timeout_prep(req, io, true);
break;
--
2.24.1
next prev parent reply other threads:[~2019-12-18 3:28 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-18 3:27 [PATCHSET v2] io_uring fixes for 5.5-rc3 Jens Axboe
2019-12-18 3:27 ` [PATCH 01/11] io_uring: fix stale comment and a few typos Jens Axboe
2019-12-18 3:27 ` [PATCH 02/11] io_uring: fix sporadic -EFAULT from IORING_OP_RECVMSG Jens Axboe
2019-12-18 3:27 ` [PATCH 03/11] io_uring: fix pre-prepped issue with force_nonblock == true Jens Axboe
2019-12-18 3:27 ` [PATCH 04/11] io_uring: remove 'sqe' parameter to the OP helpers that take it Jens Axboe
2019-12-18 3:27 ` [PATCH 05/11] io_uring: any deferred command must have stable sqe data Jens Axboe
2019-12-18 3:27 ` [PATCH 06/11] io_uring: make HARDLINK imply LINK Jens Axboe
2019-12-18 3:27 ` [PATCH 07/11] io_uring: make IORING_POLL_ADD and IORING_POLL_REMOVE deferrable Jens Axboe
2019-12-18 3:27 ` Jens Axboe [this message]
2019-12-18 3:27 ` [PATCH 09/11] io_uring: make IORING_OP_TIMEOUT_REMOVE deferrable Jens Axboe
2019-12-18 3:27 ` [PATCH 10/11] io_uring: read opcode and user_data from SQE exactly once Jens Axboe
2019-12-18 3:27 ` [PATCH 11/11] io_uring: warn about unhandled opcode Jens Axboe
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