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ore: fix BUG_ON, too few sgs when reading
commit 361aba5 upstream. When reading RAID5 files, in rare cases, we calculated too few sg segments. There should be two extra for the beginning and end partial units. Also "too few sg segments" should not be a BUG_ON there is all the mechanics in place to handle it, as a short read. So just return -ENOMEM and the rest of the code will gracefully split the IO. Signed-off-by: Boaz Harrosh <bharrosh@panasas.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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