On Saturday, 30 October, 2010, Hugo Mills wrote:
> These two patches give a degree of control over balance operations.
> The first makes it possible to get an idea of how much work remains to
> do, by tracking the number of block groups (chunks) that need to be
> moved/rewritten. The second patch allows a running balance operation
> to be cancelled when the current block group has been moved.
>
> One fundamental question, though -- is the progress monitor
> function best implemented as an ioctl, as I've done here, or should it
> be two or three sysfs files? I'm thinking of /proc/mdstat...
> Obviously, /proc/mdstat would never get into /sys, but exposing the
> "expected" and "remaining" values as files has an attractive
> simplicity to it.
I like the idea that these info should be put under sysfs. Something like
/sys/btrfs/<filesystem-uuid>/
balance -> info on balancing
devices -> list of device (a directory of
links or a file which contains
the list of devices)
subvolumes/ -> info on subvolume(s)
label -> label of the filesystem
<other btrfs filesystem related knoba>
Obviously we need another btrfs command to extract an uuid from a btrfs
filesystem like:
# btrfs filesystem get-uuid /path/to/a/btrfs/filesystem
f9b9c413-0dc8-4e3f-94f2-86faa702f519
>
> The user-space side of things are in a separate patch series, to
> follow.
>
> Please be gentle with me, this is my first (serious, non-trivial)
> kernel patch. :)
>
> Hugo.
>
>
> --
> === Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk ===
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