pnfsblock: add extent manipulation functions
Adds working implementations of various support functions to handle INVAL extents, needed by writes, such as bl_mark_sectors_init and bl_is_sector_init. [pnfsblock: fix 64-bit compiler warnings for extent manipulation] Signed-off-by: NFred Isaman <iisaman@citi.umich.edu> Signed-off-by: NBenny Halevy <bhalevy@panasas.com> Signed-off-by: NBenny Halevy <bhalevy@tonian.com> [Implement release_inval_marks] Signed-off-by: NZhang Jingwang <zhangjingwang@nrchpc.ac.cn> Signed-off-by: NJim Rees <rees@umich.edu> Signed-off-by: NTrond Myklebust <Trond.Myklebust@netapp.com>
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