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19fc516a51
Add new sysfs knob /sys/fs/btrfs/<uuid>/allocation/<type>/chunk_size. This allows to query the chunk size and also set the chunk size. Constraints: - can be changed by root only - system chunk size can't be set - maximum chunk size is 10% of the filesystem size - final value is rounded down to a multiple of 256M - cannot be set on zoned filesystem Note, that rounding and the 10% clamp will result to a different value on filesystems smaller than 10G, typically 768M. Signed-off-by: Stefan Roesch <shr@fb.com> Reviewed-by: David Sterba <dsterba@suse.com> [ Changes to original submission: - document setting constraints - drop read-only requirement - drop unnecessary error messages - fix return values of _store callback - use memparse for the value - fix rounding down to 256M ] Signed-off-by: David Sterba <dsterba@suse.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.