Zach BrownandMark Fasheh 79110a74eb scoutfs: prevent partial block stage, except final ...

The staging ioctl is just a thin wrapper around writing.  If we allowed
partial-block staging then the write would zero a newly allocated block
and only stage in the partial region of the block, leaving zeros in the
file that didn't exist before.

We prevent staging when the starting offset isn't block aligned.  We
prevent staging when the final offset isn't block aligned unless it
matches the size because the stage ends in the final partial block of
the file.

This is verified by an xfstest (scoutfs/003) that is in flight.

Signed-off-by: Zach Brown <zab@versity.com>

2017-09-07 13:49:37 -07:00

kmod

scoutfs: prevent partial block stage, except final

2017-09-07 13:49:37 -07:00

S

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