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If a filesystem is missing its data reloc tree, we get something like this in dmesg: BTRFS warning (device loop11): failed to read root (objectid=4): -2 BTRFS error (device loop11): open_ctree failed: -2 objectid is BTRFS_DEV_TREE_OBJECTID, but this should actually be the value of BTRFS_DATA_RELOC_TREE_OBJECTID. btrfs_read_roots() prints location.objectid on failure, but this isn't set when reading the data reloc tree. Set location.objectid to the correct value on failure, so that the error message makes sense. Reviewed-by: Qu Wenruo <wqu@suse.com> Signed-off-by: Mark Harmstone <mark@harmstone.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 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.