Zach Brown 165d833c46 Walk stable trees in _since ioctls ...

The _since ioctls walk btrees and return items that are newer than a
given sequence number.  The intended behaviour is that items will
appear in a greater sequence number if they change after appearing
in the queries.  This promise doesn't hold for items that are being
modified in the current transaction.  The caller would have to always
ask for seq X + 1 after seeing seq X to make sure it got all the changes
that happened in seq X while it was the current dirty transaction.

This is fixed by having the interfaces walk the stable btrees from the
previous transaction.  The results will always be a little stale but
userspace already has to deal with stale results because it can't lock
out change, and it can use sync (and a commit age tunable we'll add) to
limit how stale the results can be.

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

2016-11-08 16:05:36 -08:00

kmod

Walk stable trees in _since ioctls

2016-11-08 16:05:36 -08:00

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