c2177e4da3
Previously, checksummed extents could only be merged when the checksum covered only the currently live data. xfstest generic/064 creates a test file, then uses finsert calls to split the extent, then collapse calls to see if they get merged. But without any reads to trigger the narrow_crcs path, each of the split extents will still have a checksum for the entire original extent. This patch improves the extent merge path so that if either of the extents we're attempting to merge has a checksum that covers the entire merged extent, we just use that checksum. Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
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.