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Darrick J. Wong 34389616a9 xfs: require a relatively recent V5 filesystem for LARP mode
While reviewing the FIEXCHANGE code in XFS, I realized that the function
that enables logged xattrs doesn't actually check that the superblock
has a LOG_INCOMPAT feature bit field.  Add a check to refuse the
operation if we don't have a V5 filesystem...

...but on second though, let's require either reflink or rmap so that we
only have to deal with LARP mode on relatively /modern/ kernel.  4.14 is
about as far back as I feel like going.

Seeing as LARP is a debugging-only option anyway, this isn't likely to
affect any real users.

Fixes: d9c61ccb3b ("xfs: move xfs_attr_use_log_assist out of xfs_log.c")
Really-Fixes: f3f36c893f ("xfs: Add xfs_attr_set_deferred and xfs_attr_remove_deferred")
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Bill O'Donnell <bodonnel@redhat.com>
History 2023-09-12 10:31:08 -07:00
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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.