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59ba4fdd2d
Jan Kara suggested that when one thread is in the middle of freezing a filesystem, another thread trying to freeze the same fs but with a different freeze_holder should wait until the freezer reaches either end state (UNFROZEN or COMPLETE) instead of returning EBUSY immediately. Neither caller can do anything sensible with this race other than retry but they cannot really distinguish EBUSY as in "some other holder of the same type has the sb already frozen" from "freezing raced with holder of a different type". Plumb in the extra code needed to wait for the fs freezer to reach an end state and try the freeze again. Signed-off-by: Darrick J. Wong <djwong@kernel.org> Reviewed-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Jan Kara <jack@suse.cz>
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.