Late last year Josh Durgin had put together a series of
fixes for rbd that never got committed. I told him I
would get them in, and this series represents the last
six that remain.
Here's a summary:
[PATCH 1/6] rbd: return errors for mapped but deleted snapshot
This adds code to distinguish the result of attempting
to read data from a deleted snapshot from the the result
of reading a hole in a snapshot. The former now produces
ENXIO.
[PATCH 2/6] rbd: only reset capacity when pointing to head
When an rbd header is refreshed, its capacity is set in
case it has been changed. This should not happen for
mapped snapshots.
[PATCH 3/6] rbd: expose the correct size of the device in sysfs
An rbd_dev--even one mapping a snashot--holds the size of
it's base image in its header's image_size field. The sysfs
entry for the snapshot size was showing the wrong value.
[PATCH 4/6] rbd: set image size when header is updated
The rbd image size was not getting updated when a header
was refrehsed.
[PATCH 5/6] rbd: use reference counting for the snap context
This makes sure the rbd code takes a reference to its
snapshot context while a request related to that context
is underway.
[PATCH 6/6] rbd: send header version when notifying
This ensures the version that gets sent back on a watch
notify acknowledgement is the one that got read as
a result of refreshing the header.
I've reviewed them all, but am posting them for a chance for
others to comment before I commit them.
-Alex
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