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MFC r256926, r257005
r256926 Fix AHCI ATAPI emulation when backed with /dev/cd0 - remove assumption that the backing file/device had 512-byte sectors - fix incorrect iovec size variable that would result in a buffer overrun when an o/s issued an i/o request with more s/g elements than the blockif api r257005 Export the block size capability to guests. - Use #defines for capability bits - Export the VTBLK_F_BLK_SIZE capability - Fix bug in calculating capacity: it is in 512-byte units, not the underlying sector size This allows virtio-blk to have backing devices with non 512-byte sector sizes e.g. /dev/cd0, and 4K-block harddrives. Approved by: re (glebius)
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