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e0a8de7da3
When a v4 filesystem has fl_last - fl_first != fl_count, we do not not detect the corruption and allow the AGF to be used as it if was fully valid. On V5 filesystems, we reset the AGFL to empty in these cases and avoid the corruption at a small cost of leaked blocks. If we don't catch the corruption on V4 filesystems, bad things happen later when an allocation attempts to trim the free list and either double-frees stale entries in the AGFl or tries to free NULLAGBNO entries. Either way, this is bad. Prevent this from happening by using the AGFL_NEED_RESET logic for v4 filesysetms, too. Signed-off-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Darrick J. Wong <djwong@kernel.org> Signed-off-by: Dave Chinner <david@fromorbit.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.