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The current read verification is also relying on large folios to support bs > ps cases, but that introduced quite some limits. To enhance read-repair to support bs > ps without large folios: - Make btrfs_data_csum_ok() to accept an array of paddrs Which can pass the paddrs[] direct into btrfs_calculate_block_csum_pages(). - Make repair_one_sector() to accept an array of paddrs So that it can submit a repair bio backed by regular pages, not only large folios. This requires us to allocate more slots at bio allocation time though. Also since the caller may have only partially advanced the saved_iter for bs > ps cases, we can not directly trust the logical bytenr from saved_iter (can be unaligned), thus a manual round down is necessary for the logical bytenr. - Make btrfs_check_read_bio() to build an array of paddrs The tricky part is that we can only call btrfs_data_csum_ok() after all involved pages are assembled. This means at the call time of btrfs_check_read_bio(), our offset inside the bio is already at the end of the fs block. Thus we must re-calculate @bio_offset for btrfs_data_csum_ok() and repair_one_sector(). Signed-off-by: Qu Wenruo <wqu@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 reStructuredText 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.