Boaz Harrosh wrote:
Osd library needs to submit pre-allocated bios, form several sources. osdblk exofs and pNFS-layout driver all have prepared bios for IO submission. On top of that the osd library needs to append additional segments to the IO memory, for get/set attributes and more. All these are done today by use of a temporary hack - blk_rq_append_bio. This is bad on few accounts. 1. blk_rq_append_bio was not meant to be exported and is very specific to its users. 2. blk_rq_append_bio does not support chained bios. 3. blk_rq_append_bio does not bounce the bio and therefore current osd implementation has a bug. The proposed solution adds two new fixtures to the block layer, and a corresponding fixing patch to osd. These are:
Just wanted to say... thanks for working on this. I'll test osdblk anew once this stuff goes in, and then send you another osdblk patch.
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