gfs2: Fix length of holes reported at end-of-file
Fix the length of holes reported at the end of a file: the length is
relative to the beginning of the extent, not the seek position which is
rounded down to the filesystem block size.
This bug went unnoticed for some time, but is now caught by the
following assertion in iomap_iter_done():
WARN_ON_ONCE(iter->iomap.offset + iter->iomap.length <= iter->pos)
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
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