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commit4d4225fc22upstream. Previously we would set the reloc root's last snapshot to transid - 1. However there was a problem with doing this, and we changed it to setting the last snapshot to the generation of the commit node of the fs root. This however broke should_ignore_root(). The assumption is that if we are in a generation newer than when the reloc root was created, then we would find the reloc root through normal backref lookups, and thus can ignore any fs roots we find with an old enough reloc root. Now that the last snapshot could be considerably further in the past than before, we'd end up incorrectly ignoring an fs root. Thus we'd find no nodes for the bytenr we were searching for, and we'd fail to relocate anything. We'd loop through the relocate code again and see that there were still used space in that block group, attempt to relocate those bytenr's again, fail in the same way, and just loop like this forever. This is tricky in that we have to not modify the fs root at all during this time, so we need to have a block group that has data in this fs root that is not shared by any other root, which is why this has been difficult to reproduce. Fixes:054570a1dc("Btrfs: fix relocation incorrectly dropping data references") CC: stable@vger.kernel.org # 4.9+ Reviewed-by: Filipe Manana <fdmanana@suse.com> Signed-off-by: Josef Bacik <josef@toxicpanda.com> Signed-off-by: David Sterba <dsterba@suse.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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.
See Documentation/00-INDEX for a list of what is contained in each file.
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.