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945ea457b5
Patch series "Prevent ->map_pages from sleeping", v2. In preparation for a larger patch series which will handle (some, easy) page faults protected only by RCU, change the two filesystems which have sleeping locks to not take them and hold the RCU lock around calls to ->map_page to prevent other filesystems from adding sleeping locks. This patch (of 3): XFS doesn't actually need to be holding the XFS_MMAPLOCK_SHARED to do this. filemap_map_pages() cannot bring new folios into the page cache and the folio lock is taken during filemap_map_pages() which provides sufficient protection against a truncation or hole punch. Link: https://lkml.kernel.org/r/20230327174515.1811532-1-willy@infradead.org Link: https://lkml.kernel.org/r/20230327174515.1811532-2-willy@infradead.org Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Reviewed-by: Dave Chinner <dchinner@redhat.com> Cc: Darrick J. Wong <djwong@kernel.org> Cc: David Howells <dhowells@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.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.