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[ Upstream commit5efdd9122e] Deferred close can be a very useful feature for allowing caching data for read, and for minimizing the number of reopens needed for a file that is repeatedly opened and close but there are workloads where its default (1 second, similar to actimeo/acregmax) is much too small. Allow the user to configure the amount of time we can defer sending the final smb3 close when we have a handle lease on the file (rather than forcing it to depend on value of actimeo which is often unrelated, and less safe). Adds new mount parameter "closetimeo=" which is the maximum number of seconds we can wait before sending an SMB3 close when we have a handle lease for it. Default value also is set to slightly larger at 5 seconds (although some other clients use larger default this should still help). Suggested-by: Bharath SM <bharathsm@microsoft.com> Reviewed-by: Bharath SM <bharathsm@microsoft.com> Reviewed-by: Shyam Prasad N <sprasad@microsoft.com> Reviewed-by: Paulo Alcantara (SUSE) <pc@cjr.nz> Signed-off-by: Steve French <stfrench@microsoft.com> Stable-dep-of:d19342c660("cifs: sanitize paths in cifs_update_super_prepath.") 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.