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949b32732e
While using compression, a submitted bio is mapped with a compressed bio which performs the read from disk, decompresses and returns uncompressed data to original bio. The original bio must reflect the uncompressed size (iosize) of the I/O to be performed, or else the page just gets the decompressed I/O length of data (disk_io_size). The compressed bio checks the extent map and gets the correct length while performing the I/O from disk. This came up in subpage work when only compressed length of the original bio was filled in the page. This worked correctly for pagesize == sectorsize because both compressed and uncompressed data are at pagesize boundaries, and would end up filling the requested page. Reviewed-by: Josef Bacik <josef@toxicpanda.com> Signed-off-by: Goldwyn Rodrigues <rgoldwyn@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.