Zach Brown df561bbd19 Add offline extent flag and release ioctl ...

Add the _OFFLINE flag to indicate offline extents.  The release ioctl
frees extents within the release range and sets their _OFFLINE flag if
the data_version still matches.

We tweak the existing truncate item function just a bit to support
making extents offline.  We make it take an explicit range of blocks to
remove instead of just giving it the size and it learns to mark extents
offline and update them instead of always deleting them.

Reads from offline extents return zeros like reading from a sparse
region (later it will trigger demand staging) and writing to offline
extents clears the offline flag (later only staging can do that).

Signed-off-by: Zach Brown <zab@versity.com>
Reviewed-by: Mark Fasheh <mfasheh@versity.com>

2016-11-16 14:45:08 -08:00

kmod

Add offline extent flag and release ioctl

2016-11-16 14:45:08 -08:00

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