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In commitfe341eb151, I forgot that xfs_free_file_space isn't strictly a "remove mapped blocks" function. It is actually a function to zero file space by punching out the middle and writing zeroes to the unaligned ends of the specified range. Therefore, putting a rtextsize alignment check in that function is wrong because that breaks unaligned ZERO_RANGE on the realtime volume. Furthermore, xfs_file_fallocate already has alignment checks for the functions require the file range to be aligned to the size of a fundamental allocation unit (which is 1 FSB on the data volume and 1 rt extent on the realtime volume). Create a new helper to check fallocate arguments against the realtiem allocation unit size, fix the fallocate frontend to use it, fix free_file_space to delete the correct range, and remove a now redundant check from insert_file_space. NOTE: The realtime extent size is not required to be a power of two! Fixes:fe341eb151("xfs: ensure that fpunch, fcollapse, and finsert operations are aligned to rt extent size") Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Chandan Babu R <chandanrlinux@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.