[Qemu-devel] [PATCH VERSION 2] Disk image shared and exclusive locks.

[Richard W.M. Jones]

Here's a second go at this patch.  The only change is that we add a
second parameter (backinglock=none|shared|exclusive) which can be used
to control locking on the first level (only) of backing disk.

Dan Berrange convinced me there was a case to retain a distinct shared
locking type.

For any qemu instance which is going to use the "commit" command, I
would advise using: lock=exclusive,backinglock=exclusive.

For qemu instances which won't be using commit, I would advise:
lock=exclusive,backinglock=shared.

For qemu instances which are using GFS-like shared filesystems, I
would advise: lock=shared.

Rich.

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0001-Disk-image-shared-and-exclusive-locks.patch
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