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While I was auditing the code in xfs_repair that adds feature bits to existing V5 filesystems, I decided to have a look at how online fsck handles feature bits, and I found a few problems: 1) ATTR2 is added to the primary super when an xattr is set to a file, but that isn't consistently propagated to secondary supers. This isn't a corruption, merely a discrepancy that repair will fix if it ever has to restore the primary from a secondary. Hence, if we find a mismatch on a secondary, this is a preen condition, not a corruption. 2) There are more compat and ro_compat features now than there used to be, but we mask off the newer features from testing. This means we ignore inconsistencies in the INOBTCOUNT and BIGTIME features, which is wrong. Get rid of the masking and compare directly. 3) NEEDSREPAIR, when set on a secondary, is ignored by everyone. Hence a mismatch here should also be flagged for preening, and online repair should clear the flag. Right now we ignore it due to (2). 4) log_incompat features are ephemeral, since we can clear the feature bit as soon as the log no longer contains live records for a particular log feature. As such, the only copy we care about is the one in the primary super. If we find any bits set in the secondary super, we should flag that for preening, and clear the bits if the user elects to repair it. Signed-off-by: Darrick J. Wong <djwong@kernel.org> Reviewed-by: Dave Chinner <dchinner@redhat.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.