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[ Upstream commit 39c3a948ecf6e7b8f55f0e91a5febc924fede4d7 ] When punching a hole in a file, use filemap_write_and_wait_range to write back any dirty pages in the range of the hole. As a side effect, if the hole isn't page aligned, this marks unaligned pages at the beginning and the end of the hole read-only. This is required when the block size is smaller than the page size: when those pages are written to again after the hole punching, we must make sure that page_mkwrite is called for those pages so that the page will be fully allocated and any blocks turned into holes from the hole punching will be reallocated. (If a page is writably mapped, page_mkwrite won't be called.) Fixes xfstest generic/567. Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com> Signed-off-by: Sasha Levin <sashal@kernel.org> |
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| README | ||
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.