xfs: don't allocate into the data fork for an unshare request

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For an unshare request, we only have to take action if the data fork has
a shared mapping.  We don't care if someone else set up a cow operation.
If we find nothing in the data fork, return a hole to avoid allocating
space.

Note that fallocate will replace the delalloc reservation with an
unwritten extent anyway, so this has no user-visible effects outside of
avoiding unnecessary updates.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>

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Darrick J. Wong 2023-05-02 09:14:51 +10:00 • committed by Dave Chinner

parent 397b2d7e0f

commit 1f1397b721

1 changed files with 3 additions and 2 deletions

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fs/xfs/xfs_iomap.c

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