xfs: do not use unchecked extent indices in xfs_bmapi
Make sure to only call xfs_iext_get_ext after we've validate the extent index when moving on to the next index in xfs_bmapi. Based on an earlier patch from Lachlan McIlroy. Signed-off-by: NChristoph Hellwig <hch@lst.de> Reviewed-by: NLachlan McIlroy <lmcilroy@redhat.com> Signed-off-by: NAlex Elder <aelder@sgi.com>
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