[Bug 785] xfs_io doesn't correctly reallocate struct getbmapx in bmap_f

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http://oss.sgi.com/bugzilla/show_bug.cgi?id=785





--- Comment #5 from Christoph Hellwig <hch@xxxxxxx>  2009-03-20 02:21:33 CST ---
Thanks a lot for the testcase.  I understand the problem now.

XFS_IOC_FSGETXATTR only counts actually allocated extents, but for each
allocated extent we may have a hole inbetween that is not allocated.

I've modified your patch a little bit to add comments what's going on and
adjust
the numbers a bit.

I've also created adopted your testcase for xfsqa so that we can
regression-test this.

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