recursive subvolume delete

recursive subvolume delete

[krzf83@gmail.com]

btrfs is missing recursive subvolume delete. You can't delete
subvolume if there is other subvolumes/snapshots in it. Also I think
there are no real tools to find out which directories are
subvolumes/snapshots

Re: recursive subvolume delete

[Hugo Mills]

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On Sun, Oct 02, 2011 at 04:38:21PM +0200, krzf83@gmail.com  wrote:
> btrfs is missing recursive subvolume delete. You can't delete
> subvolume if there is other subvolumes/snapshots in it. Also I think
> there are no real tools to find out which directories are
> subvolumes/snapshots

$ btrfs sub list /mountpoint

   This will tell you what subvolumes you have on any given filesystem.

   Hugo.

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Re: recursive subvolume delete

[David Sterba]

On Sun, Oct 02, 2011 at 04:38:21PM +0200, krzf83@gmail.com  wrote:
> Also I think there are no real tools to find out which directories are
> subvolumes/snapshots

Well, there are, but these are the _real_ tools, you know.

subv1 is a subvolume
snap1 is it's snapshot

$ stat subv1 snap1
  File: `subv1'
  Size: 0               Blocks: 0          IO Block: 4096   directory
Device: 1ch/28d Inode: 256         Links: 1
Access: (0700/drwx------)  Uid: (    0/    root)   Gid: (    0/    root)
Access: 2011-10-02 19:12:04.493885220 +0200
Modify: 2011-10-02 19:12:04.493885220 +0200
Change: 2011-10-02 19:12:04.493885220 +0200
 Birth: -
  File: `snap1'
  Size: 0               Blocks: 0          IO Block: 4096   directory
Device: b1h/177d        Inode: 256         Links: 1
Access: (0700/drwx------)  Uid: (    0/    root)   Gid: (    0/    root)
Access: 2011-10-02 19:12:04.493885220 +0200
Modify: 2011-10-02 19:12:04.493885220 +0200
Change: 2011-10-02 19:12:04.493885220 +0200
 Birth: -


Common signature is "Inode: 256" and this is acutally the same test which is
performed by 'btrfs subvol ...' to check whether the source dir is a
subvolume, and by the kernel module as well.


david

Re: recursive subvolume delete

[Stephane Chazelas]

2011-10-02 16:38:21 +0200, krzf83@gmail.com :
> Also I think there are no real tools to find out which
> directories are subvolumes/snapshots
[...]

On my system (debian), there's "mountpoint" command (from the
initscript package from
http://savannah.nongnu.org/projects/sysvinit) that will tell you
that (it compares the st_dev of the given directory with that of
directory/..).

-- 
Stephane