[sheepdog] [PATCH v3 0/3] sheepdog: implement .bdrv_co_is_allocated

[Liu Yuan]

From: Liu Yuan <tailai.ly at taobao.com>

v3:
 - include discard patch for easy review and merge
 - update the comment typo
 - get variable 'idx' definition more clear

v2:
 - correct 'end' calculation
 - get the longest unallocated area
 - replace SECTOR_SIZE with BDRV_SECTOR_SIZE

PATCH 1/3 is the previous distard patch which implement .bdrv_co_discard
PATCH 2/3 is ia prepare patch
PATCH 3/3 implement .bdrv_co_is_allocated

Thanks,
Yuan
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1.7.9.5