public inbox for [email protected]
 help / color / mirror / Atom feed
From: Pavel Begunkov <[email protected]>
To: [email protected]
Cc: Jens Axboe <[email protected]>,
	[email protected], Conrad Meyer <[email protected]>,
	[email protected], [email protected]
Subject: [PATCH v2 1/7] io_uring/cmd: expose iowq to cmds
Date: Thu, 22 Aug 2024 04:35:51 +0100	[thread overview]
Message-ID: <55ce8b5b813a7ca40597457b9afc8fd17d4ff11b.1724297388.git.asml.silence@gmail.com> (raw)
In-Reply-To: <[email protected]>

When an io_uring request needs blocking context we offload it to the
io_uring's thread pool called io-wq. We can get there off ->uring_cmd
by returning -EAGAIN, but there is no straightforward way of doing that
from an asynchronous callback. Add a helper that would transfer a
command to a blocking context.

Note, we do an extra hop via task_work before io_queue_iowq(), that's a
limitation of io_uring infra we have that can likely be lifted later
if that would ever become a problem.

Signed-off-by: Pavel Begunkov <[email protected]>
---
 include/linux/io_uring/cmd.h |  6 ++++++
 io_uring/io_uring.c          | 11 +++++++++++
 io_uring/io_uring.h          |  1 +
 io_uring/uring_cmd.c         |  7 +++++++
 4 files changed, 25 insertions(+)

diff --git a/include/linux/io_uring/cmd.h b/include/linux/io_uring/cmd.h
index 447fbfd32215..86ceb3383e49 100644
--- a/include/linux/io_uring/cmd.h
+++ b/include/linux/io_uring/cmd.h
@@ -48,6 +48,9 @@ void __io_uring_cmd_do_in_task(struct io_uring_cmd *ioucmd,
 void io_uring_cmd_mark_cancelable(struct io_uring_cmd *cmd,
 		unsigned int issue_flags);
 
+/* Execute the request from a blocking context */
+void io_uring_cmd_issue_blocking(struct io_uring_cmd *ioucmd);
+
 #else
 static inline int io_uring_cmd_import_fixed(u64 ubuf, unsigned long len, int rw,
 			      struct iov_iter *iter, void *ioucmd)
@@ -67,6 +70,9 @@ static inline void io_uring_cmd_mark_cancelable(struct io_uring_cmd *cmd,
 		unsigned int issue_flags)
 {
 }
+static inline void io_uring_cmd_issue_blocking(struct io_uring_cmd *ioucmd)
+{
+}
 #endif
 
 /*
diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c
index a53f2f25a80b..323cad8175e9 100644
--- a/io_uring/io_uring.c
+++ b/io_uring/io_uring.c
@@ -533,6 +533,17 @@ static void io_queue_iowq(struct io_kiocb *req)
 		io_queue_linked_timeout(link);
 }
 
+static void io_req_queue_iowq_tw(struct io_kiocb *req, struct io_tw_state *ts)
+{
+	io_queue_iowq(req);
+}
+
+void io_req_queue_iowq(struct io_kiocb *req)
+{
+	req->io_task_work.func = io_req_queue_iowq_tw;
+	io_req_task_work_add(req);
+}
+
 static __cold void io_queue_deferred(struct io_ring_ctx *ctx)
 {
 	while (!list_empty(&ctx->defer_list)) {
diff --git a/io_uring/io_uring.h b/io_uring/io_uring.h
index 65078e641390..9d70b2cf7b1e 100644
--- a/io_uring/io_uring.h
+++ b/io_uring/io_uring.h
@@ -94,6 +94,7 @@ int io_uring_alloc_task_context(struct task_struct *task,
 
 int io_ring_add_registered_file(struct io_uring_task *tctx, struct file *file,
 				     int start, int end);
+void io_req_queue_iowq(struct io_kiocb *req);
 
 int io_poll_issue(struct io_kiocb *req, struct io_tw_state *ts);
 int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr);
diff --git a/io_uring/uring_cmd.c b/io_uring/uring_cmd.c
index 8391c7c7c1ec..39c3c816ec78 100644
--- a/io_uring/uring_cmd.c
+++ b/io_uring/uring_cmd.c
@@ -277,6 +277,13 @@ int io_uring_cmd_import_fixed(u64 ubuf, unsigned long len, int rw,
 }
 EXPORT_SYMBOL_GPL(io_uring_cmd_import_fixed);
 
+void io_uring_cmd_issue_blocking(struct io_uring_cmd *ioucmd)
+{
+	struct io_kiocb *req = cmd_to_io_kiocb(ioucmd);
+
+	io_req_queue_iowq(req);
+}
+
 static inline int io_uring_cmd_getsockopt(struct socket *sock,
 					  struct io_uring_cmd *cmd,
 					  unsigned int issue_flags)
-- 
2.45.2


  reply	other threads:[~2024-08-22  3:35 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-08-22  3:35 [PATCH v2 0/7] implement async block discards/etc. via io_uring Pavel Begunkov
2024-08-22  3:35 ` Pavel Begunkov [this message]
2024-08-22  3:35 ` [PATCH v2 2/7] io_uring/cmd: give inline space in request to cmds Pavel Begunkov
2024-08-22  3:35 ` [PATCH v2 3/7] filemap: introduce filemap_invalidate_pages Pavel Begunkov
2024-08-22  6:37   ` Christoph Hellwig
2024-08-22  3:35 ` [PATCH v2 4/7] block: introduce blk_validate_write() Pavel Begunkov
2024-08-22  6:33   ` Christoph Hellwig
2024-08-22 12:36     ` Pavel Begunkov
2024-08-23 11:52       ` Christoph Hellwig
2024-08-22  3:35 ` [PATCH v2 5/7] block: implement async discard as io_uring cmd Pavel Begunkov
2024-08-22  6:46   ` Christoph Hellwig
2024-08-22 13:07     ` Pavel Begunkov
2024-08-23 11:59       ` Christoph Hellwig
2024-09-04 14:08         ` Pavel Begunkov
2024-08-22  3:35 ` [PATCH v2 6/7] block: implement async wire write zeroes Pavel Begunkov
2024-08-22  6:50   ` Christoph Hellwig
2024-08-22 13:09     ` Pavel Begunkov
2024-08-22  3:35 ` [PATCH v2 7/7] block: implement async secure erase Pavel Begunkov
2024-08-22  6:36   ` Christoph Hellwig
2024-08-22 12:36     ` Pavel Begunkov

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=55ce8b5b813a7ca40597457b9afc8fd17d4ff11b.1724297388.git.asml.silence@gmail.com \
    [email protected] \
    [email protected] \
    [email protected] \
    [email protected] \
    [email protected] \
    [email protected] \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox