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b29dca44ab
Btrfs scrub is more flexible than buffered data write path, as we can read an unaligned subpage data into page offset 0. This ability makes subpage support much easier, we just need to check each scrub_page::page_len and ensure we only calculate hash for [0, page_len) of a page. There is a small thing to notice: for subpage case, we still do sector by sector scrub. This means we will submit a read bio for each sector to scrub, resulting in the same amount of read bios, just like on the 4K page systems. This behavior can be considered as a good thing, if we want everything to be the same as 4K page systems. But this also means, we're wasting the possibility to submit larger bio using 64K page size. This is another problem to consider in the future. Signed-off-by: Qu Wenruo <wqu@suse.com> Reviewed-by: David Sterba <dsterba@suse.com> 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.