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9ba2eb25f0
__bch2_truncate_page() will mark some of the blocks in a page as unallocated. But, if the page is mmapped (and writable), every block in the page needs to be marked dirty, else those blocks won't be written by __bch2_writepage(). The solution is to change those userspace mappings to RO, so that we force bch2_page_mkwrite() to be called again. Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com> Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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.