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[ Upstream commit 00be6f26a2a7c671f1402d74c4d3c30a5844660a ] When io_uring is used in the same task as CIFS, there might be unnecessary reconnects, causing issues in user-space applications like QEMU with a log like: > CIFS: VFS: \\10.10.100.81 Error -512 sending data on socket to server Certain io_uring completions might be added to task_work with notify_method being TWA_SIGNAL and thus TIF_NOTIFY_SIGNAL is set for the task. In __smb_send_rqst(), signals are masked before calling smb_send_kvec(), but the masking does not apply to TIF_NOTIFY_SIGNAL. If sk_stream_wait_memory() is reached via sock_sendmsg() while TIF_NOTIFY_SIGNAL is set, signal_pending(current) will evaluate to true there, and -EINTR will be propagated all the way from sk_stream_wait_memory() to sock_sendmsg() in smb_send_kvec(). Afterwards, __smb_send_rqst() will see that not everything was written and reconnect. Signed-off-by: Fiona Ebner <f.ebner@proxmox.com> Signed-off-by: Steve French <stfrench@microsoft.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.