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Commit323ac95bce("Btrfs: don't read leaf blocks containing only checksums during truncate") changed the condition from `level == 0` to `level == path->lowest_level`, while its original purpose was just to do some leaf node handling (calling btrfs_item_key_to_cpu()) and skip some code that doesn't fit leaf nodes. After changing the condition, the code path: 1. Also handles the non-leaf nodes when path->lowest_level is nonzero, which is wrong. However btrfs_search_forward() is never called with a nonzero path->lowest_level, which makes this bug not found before. 2. Makes the later if block with the same condition, which was originally used to handle non-leaf node (calling btrfs_node_key_to_cpu()) when lowest_level is not zero, dead code. Since btrfs_search_forward() is never called for a path with a lowest_level different from zero, just completely remove the partial support for a non-zero lowest_level, simplifying a bit the code, and assert that lowest_level is zero at the start of the function. Suggested-by: Qu Wenruo <wqu@suse.com> Fixes:323ac95bce("Btrfs: don't read leaf blocks containing only checksums during truncate") Reviewed-by: Filipe Manana <fdmanana@suse.com> Signed-off-by: Sun YangKai <sunk67188@gmail.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.