Richard,
On 25/10/2012 20:30, Richard Hughes wrote:
I'm planning to use "btrfs subvolume snapshot -r<name>" in the system
upgrade functionality[1] if the user is using btrfs for their root file
system. We've got most of the bits in place already for Fedora 18.
One think that confuses me is the convention for the naming of
snapshots. Is there any conventions or prior art there? Can I add
metadata to the snapshot so that I don't have encode everything in the
snapshot name itself?
I have an experimental-patch to add tag for the snapshot.
I can send it to you for a review (but I doubt if its any near
for the integration, since it changes the root_info structure
and I want to know if there is any better place to store
the tag for the snapshots (like if its better to allocate
a chunk to place this and all other properties in a xml format ?))
Also, being able to do a snapshot using a libbtrfs (or whatever) would
be much preferable to exec'ing the btrfs command and then trying to
parse the exit code and any stderr.
Its planned. At least for the functions surrounding the snapshots.
I don't know if this kind of thing
is the norm for filesystem utilities, but a versioned shared library to
use would be awesome.
Any advice welcome, thanks.
Richard
(PackageKit author)
[1] https://fedoraproject.org/wiki/Features/OfflineSystemUpdates
Other things which might be useful are
- default location for the snapshots which can be reset
using the btrfs set cli or lib.
- default name for the snapshots.
- A pre-defined profile for the snapshots
(eg. Snapshots taken for backup may need to
bypass the read-cache, when read)
Thanks, Anand
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