linux-kernel - Re: [PATCH] Add RWF_NOSIGNAL flag for pwritev2

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Message-ID: <20250829-laufpass-zahmen-3dd1924da2ad@brauner>
Date: Fri, 29 Aug 2025 15:08:38 +0200
From: Christian Brauner <brauner@...nel.org>
To: Lauri Vasama <git@...ama.org>
Cc: Christian Brauner <brauner@...nel.org>,
	Jens Axboe <axboe@...nel.dk>,
	Jan Kara <jack@...e.cz>,
	Simon Horman <horms@...nel.org>,
	linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Eric Dumazet <edumazet@...gle.com>,
	Kuniyuki Iwashima <kuniyu@...gle.com>,
	Paolo Abeni <pabeni@...hat.com>,
	Willem de Bruijn <willemb@...gle.com>,
	"David S. Miller" <davem@...emloft.net>,
	Jakub Kicinski <kuba@...nel.org>
Subject: Re: [PATCH] Add RWF_NOSIGNAL flag for pwritev2

On Wed, 27 Aug 2025 16:39:00 +0300, Lauri Vasama wrote:
> For a user mode library to avoid generating SIGPIPE signals (e.g.
> because this behaviour is not portable across operating systems) is
> cumbersome. It is generally bad form to change the process-wide signal
> mask in a library, so a local solution is needed instead.
> 
> For I/O performed directly using system calls (synchronous or readiness
> based asynchronous) this currently involves applying a thread-specific
> signal mask before the operation and reverting it afterwards. This can be
> avoided when it is known that the file descriptor refers to neither a
> pipe nor a socket, but a conservative implementation must always apply
> the mask. This incurs the cost of two additional system calls. In the
> case of sockets, the existing MSG_NOSIGNAL flag can be used with send.
> 
> [...]

Applied to the vfs-6.18.misc branch of the vfs/vfs.git tree.
Patches in the vfs-6.18.misc branch should appear in linux-next soon.

Please report any outstanding bugs that were missed during review in a
new review to the original patch series allowing us to drop it.

It's encouraged to provide Acked-bys and Reviewed-bys even though the
patch has now been applied. If possible patch trailers will be updated.

Note that commit hashes shown below are subject to change due to rebase,
trailer updates or similar. If in doubt, please check the listed branch.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs.git
branch: vfs-6.18.misc

[1/1] Add RWF_NOSIGNAL flag for pwritev2
      https://git.kernel.org/vfs/vfs/c/db2ab24a341c