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snapshots of directories

DISCUSSION Michael Niederle 4 participants 5 messages Jan 12, 2010 – Jan 14, 2010 Btrfs file system

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Michael Niederle

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#0 lore raw

I try to take a snapshot of a single directory, e.g. root:

Quoted 1 line

btrfsctl -s root.2010-01-12 /root

operation complete
Btrfs v0.19-4-gab8fb4c-dirty

Then I take look what's inside the newly created snapshot:

Quoted 1 line

ls -l /root.2010-01-12/

total 0
drwxr-xr-x 1 root root 1192 2010-01-03 20:32:12 bin
drwxr-xr-x 1 root root 76 2009-06-25 0:40:35 boot
drwxr-xr-x 1 root root 1756 2010-01-12 2:33:07 cmds
drwxr-xr-x 1 root root 0 2010-01-06 12:21:46 data
drwxr-xr-x 1 root root 4356 2010-01-12 2:07:00 dev
drwxr-xr-x 1 root root 42 2010-01-04 12:29:45 downloads
drwxr-xr-x 1 root root 4528 2010-01-12 2:12:12 etc
drwxr-xr-x 1 root root 52 2010-01-11 12:57:47 home
drwxr-xr-x 1 root root 0 2007-11-10 4:44:07 initrd
drwxr-xr-x 1 root root 4490 2010-01-05 20:15:53 lib drwxr-xr-x 1 root root 124 2008-04-27 14:53:39 mnt
drwxr-xr-x 1 root root 62 2008-01-08 0:21:58 net
drwxr-xr-x 1 root root 0 2008-04-09 3:19:16 objects
drwxr-xr-x 1 root root 316 2009-12-28 23:23:13 opt

dr-xr-xr-x 1 root root    0 2007-11-10  3:35:28 proc
drwxr-xr-x 1 root root 7676 2010-01-11  0:35:41 root
drwxr-xr-x 1 root root    0 2010-01-12  1:56:17 save
drwxr-xr-x 1 root root    0 2010-01-12  1:55:58 save2
drwxr-xr-x 1 root root 3804 2010-01-06  2:36:08 sbin
drwxr-xr-x 1 root root    0 2007-11-10  3:35:28 sys

drwxr-xr-x 1 root root 358 2010-01-11 18:44:29 tmp drwxr-xr-x 1 root root 176 2009-12-29 17:08:37 usr
drwxr-xr-x 1 root root 72 2010-01-05 20:03:00 var

It seems that always a snapshot of the root is taken instead one of the specified directory? Is this by design?

Snapshotting the root works fine, but if you take several snapshots it's a bit "recursive", because every new snapshot contains all previous snapshots.

Greetings, Michael

#1 lore raw

In btrfs, snapshot is a clone of subvolume, not arbitrary directory.
You specified '/root' directory and it is not subvolume, snapshot is created for parent subvolume, root of filesystem.

Regards,
taruisi

Quoted 45 lines · Michael Niederle

I try to take a snapshot of a single directory, e.g. root:

Quoted 1 line

btrfsctl -s root.2010-01-12 /root

operation complete
Btrfs v0.19-4-gab8fb4c-dirty

Then I take look what's inside the newly created snapshot:

Quoted 1 line

ls -l /root.2010-01-12/

total 0
drwxr-xr-x 1 root root 1192 2010-01-03 20:32:12 bin
drwxr-xr-x 1 root root 76 2009-06-25 0:40:35 boot
drwxr-xr-x 1 root root 1756 2010-01-12 2:33:07 cmds
drwxr-xr-x 1 root root 0 2010-01-06 12:21:46 data
drwxr-xr-x 1 root root 4356 2010-01-12 2:07:00 dev
drwxr-xr-x 1 root root 42 2010-01-04 12:29:45 downloads
drwxr-xr-x 1 root root 4528 2010-01-12 2:12:12 etc
drwxr-xr-x 1 root root 52 2010-01-11 12:57:47 home
drwxr-xr-x 1 root root 0 2007-11-10 4:44:07 initrd
drwxr-xr-x 1 root root 4490 2010-01-05 20:15:53 lib drwxr-xr-x 1 root root 124 2008-04-27 14:53:39 mnt
drwxr-xr-x 1 root root 62 2008-01-08 0:21:58 net
drwxr-xr-x 1 root root 0 2008-04-09 3:19:16 objects
drwxr-xr-x 1 root root 316 2009-12-28 23:23:13 opt

dr-xr-xr-x 1 root root    0 2007-11-10  3:35:28 proc
drwxr-xr-x 1 root root 7676 2010-01-11  0:35:41 root
drwxr-xr-x 1 root root    0 2010-01-12  1:56:17 save
drwxr-xr-x 1 root root    0 2010-01-12  1:55:58 save2
drwxr-xr-x 1 root root 3804 2010-01-06  2:36:08 sbin
drwxr-xr-x 1 root root    0 2007-11-10  3:35:28 sys

drwxr-xr-x 1 root root 358 2010-01-11 18:44:29 tmp drwxr-xr-x 1 root root 176 2009-12-29 17:08:37 usr
drwxr-xr-x 1 root root 72 2010-01-05 20:03:00 var

It seems that always a snapshot of the root is taken instead one of the specified directory? Is this by design?

Snapshotting the root works fine, but if you take several snapshots it's a bit "recursive", because every new snapshot contains all previous snapshots.

Greetings, Michael
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#2 lore raw
Quoted 4 lines · On Tuesday 12 January 2010 03.19:34 TARUISI Hiroaki wrote:

In btrfs, snapshot is a clone of subvolume, not arbitrary directory.
You specified '/root' directory and it is not subvolume, snapshot is created for parent subvolume, root of filesystem.

... hence my proposal (haven't seen a comment so far) to have snapshot creation fail if the specified directory is not a subvol root.

cheers
-- vbi

Quoted 57 lines

Regards,
taruisi

Quoted 41 lines · Michael Niederle

I try to take a snapshot of a single directory, e.g. root:

Quoted 1 line

btrfsctl -s root.2010-01-12 /root

operation complete
Btrfs v0.19-4-gab8fb4c-dirty

Then I take look what's inside the newly created snapshot:

Quoted 1 line

ls -l /root.2010-01-12/

total 0
drwxr-xr-x 1 root root 1192 2010-01-03 20:32:12 bin
drwxr-xr-x 1 root root 76 2009-06-25 0:40:35 boot
drwxr-xr-x 1 root root 1756 2010-01-12 2:33:07 cmds
drwxr-xr-x 1 root root 0 2010-01-06 12:21:46 data
drwxr-xr-x 1 root root 4356 2010-01-12 2:07:00 dev
drwxr-xr-x 1 root root 42 2010-01-04 12:29:45 downloads
drwxr-xr-x 1 root root 4528 2010-01-12 2:12:12 etc
drwxr-xr-x 1 root root 52 2010-01-11 12:57:47 home
drwxr-xr-x 1 root root 0 2007-11-10 4:44:07 initrd
drwxr-xr-x 1 root root 4490 2010-01-05 20:15:53 lib drwxr-xr-x 1 root root 124 2008-04-27 14:53:39 mnt
drwxr-xr-x 1 root root 62 2008-01-08 0:21:58 net
drwxr-xr-x 1 root root 0 2008-04-09 3:19:16 objects
drwxr-xr-x 1 root root 316 2009-12-28 23:23:13 opt

dr-xr-xr-x 1 root root    0 2007-11-10  3:35:28 proc
drwxr-xr-x 1 root root 7676 2010-01-11  0:35:41 root
drwxr-xr-x 1 root root    0 2010-01-12  1:56:17 save
drwxr-xr-x 1 root root    0 2010-01-12  1:55:58 save2
drwxr-xr-x 1 root root 3804 2010-01-06  2:36:08 sbin
drwxr-xr-x 1 root root    0 2007-11-10  3:35:28 sys

drwxr-xr-x 1 root root 358 2010-01-11 18:44:29 tmp drwxr-xr-x 1 root root 176 2009-12-29 17:08:37 usr
drwxr-xr-x 1 root root 72 2010-01-05 20:03:00 var

It seems that always a snapshot of the root is taken instead one of the specified directory? Is this by design?

Snapshotting the root works fine, but if you take several snapshots it's a bit "recursive", because every new snapshot contains all previous snapshots.

Quoted 5 lines

Greetings, Michael
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Signature · 4 lines
Most scientists think that the not-fossil theory is a red herring;
indeed, they think that oil is lots of herrings (and other things)
compacted over time into sticky black mud.
        -- Prospect Magazine, March 2003, p. 6
#3 lore raw
In reply to TARUISI Hiroaki

Did I get you right in that btrfs does not support snapshots of an arbitrary directory?

Regards,
Andrey

Quoted 5 lines · TARUISI Hiroaki

In btrfs, snapshot is a clone of subvolume, not arbitrary directory.
You specified '/root' directory and it is not subvolume, snapshot is created for parent subvolume, root of filesystem.

Quoted 39 lines

Regards,
taruisi

Quoted 35 lines · Michael Niederle

I try to take a snapshot of a single directory, e.g. root:

Quoted 1 line

btrfsctl -s root.2010-01-12 /root

operation complete
Btrfs v0.19-4-gab8fb4c-dirty

Then I take look what's inside the newly created snapshot:

Quoted 1 line

ls -l /root.2010-01-12/

total 0
drwxr-xr-x 1 root root 1192 2010-01-03 20:32:12 bin drwxr-xr-x 1 root root =A0 76 2009-06-25 =A00:40:35 boot drwxr-xr-x 1 root root 1756 2010-01-12 =A02:33:07 cmds drwxr-xr-x 1 root root =A0 =A00 2010-01-06 12:21:46 data drwxr-xr-x 1 root root 4356 2010-01-12 =A02:07:00 dev drwxr-xr-x 1 root root =A0 42 2010-01-04 12:29:45 downloads drwxr-xr-x 1 root root 4528 2010-01-12 =A02:12:12 etc drwxr-xr-x 1 root root =A0 52 2010-01-11 12:57:47 home drwxr-xr-x 1 root root =A0 =A00 2007-11-10 =A04:44:07 initrd drwxr-xr-x 1 root root 4490 2010-01-05 20:15:53 lib drwxr-xr-x 1 root root =A0124 2008-04-27 14:53:39 mnt drwxr-xr-x 1 root root =A0 62 2008-01-08 =A00:21:58 net drwxr-xr-x 1 root root =A0 =A00 2008-04-09 =A03:19:16 objects drwxr-xr-x 1 root root =A0316 2009-12-28 23:23:13 opt dr-xr-xr-x 1 root root =A0 =A00 2007-11-10 =A03:35:28 proc drwxr-xr-x 1 root root 7676 2010-01-11 =A00:35:41 root drwxr-xr-x 1 root root =A0 =A00 2010-01-12 =A01:56:17 save drwxr-xr-x 1 root root =A0 =A00 2010-01-12 =A01:55:58 save2 drwxr-xr-x 1 root root 3804 2010-01-06 =A02:36:08 sbin drwxr-xr-x 1 root root =A0 =A00 2007-11-10 =A03:35:28 sys drwxr-xr-x 1 root root =A0358 2010-01-11 18:44:29 tmp drwxr-xr-x 1 root root =A0176 2009-12-29 17:08:37 usr drwxr-xr-x 1 root root =A0 72 2010-01-05 20:03:00 var

It seems that always a snapshot of the root is taken instead one of =

the

Quoted 3 lines
Quoted 3 lines

specified directory? Is this by design?

Snapshotting the root works fine, but if you take several snapshots =

it's a bit

Quoted 1 line
Quoted 1 line

"recursive", because every new snapshot contains all previous snapsh=

ots.

Quoted 4 lines
Quoted 4 lines

Greetings, Michael
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To unsubscribe from this list: send the line "unsubscribe linux-btrf=

s" in

Quoted 5 lines
Quoted 2 lines

the body of a message to [email protected]
More majordomo info at =A0http://vger.kernel.org/majordomo-info.html

--
To unsubscribe from this list: send the line "unsubscribe linux-btrfs=

" in

Quoted 3 lines

the body of a message to [email protected]
More majordomo info at =A0http://vger.kernel.org/majordomo-info.html

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#4 lore raw

Yes. I mean that.
In detail, 'non subvolume directory' may be more precise than 'arbitrary directory'.

Thanks for your description.

Regards,
taruisi

Quoted 71 lines · Andrey Kuzmin

Did I get you right in that btrfs does not support snapshots of an arbitrary directory?

Regards,
Andrey

Quoted 60 lines · TARUISI Hiroaki

In btrfs, snapshot is a clone of subvolume, not arbitrary directory.
You specified '/root' directory and it is not subvolume, snapshot is created for parent subvolume, root of filesystem.

Regards,
taruisi

Quoted 37 lines · Michael Niederle

I try to take a snapshot of a single directory, e.g. root:

Quoted 1 line

btrfsctl -s root.2010-01-12 /root

operation complete
Btrfs v0.19-4-gab8fb4c-dirty

Then I take look what's inside the newly created snapshot:

Quoted 1 line

ls -l /root.2010-01-12/

total 0
drwxr-xr-x 1 root root 1192 2010-01-03 20:32:12 bin
drwxr-xr-x 1 root root 76 2009-06-25 0:40:35 boot
drwxr-xr-x 1 root root 1756 2010-01-12 2:33:07 cmds
drwxr-xr-x 1 root root 0 2010-01-06 12:21:46 data
drwxr-xr-x 1 root root 4356 2010-01-12 2:07:00 dev
drwxr-xr-x 1 root root 42 2010-01-04 12:29:45 downloads
drwxr-xr-x 1 root root 4528 2010-01-12 2:12:12 etc
drwxr-xr-x 1 root root 52 2010-01-11 12:57:47 home
drwxr-xr-x 1 root root 0 2007-11-10 4:44:07 initrd
drwxr-xr-x 1 root root 4490 2010-01-05 20:15:53 lib drwxr-xr-x 1 root root 124 2008-04-27 14:53:39 mnt
drwxr-xr-x 1 root root 62 2008-01-08 0:21:58 net
drwxr-xr-x 1 root root 0 2008-04-09 3:19:16 objects
drwxr-xr-x 1 root root 316 2009-12-28 23:23:13 opt

dr-xr-xr-x 1 root root    0 2007-11-10  3:35:28 proc
drwxr-xr-x 1 root root 7676 2010-01-11  0:35:41 root
drwxr-xr-x 1 root root    0 2010-01-12  1:56:17 save
drwxr-xr-x 1 root root    0 2010-01-12  1:55:58 save2
drwxr-xr-x 1 root root 3804 2010-01-06  2:36:08 sbin
drwxr-xr-x 1 root root    0 2007-11-10  3:35:28 sys

drwxr-xr-x 1 root root 358 2010-01-11 18:44:29 tmp drwxr-xr-x 1 root root 176 2009-12-29 17:08:37 usr
drwxr-xr-x 1 root root 72 2010-01-05 20:03:00 var

It seems that always a snapshot of the root is taken instead one of the specified directory? Is this by design?

Quoted 8 lines

Snapshotting the root works fine, but if you take several snapshots it's a bit "recursive", because every new snapshot contains all previous snapshots.

Greetings, Michael
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taruisi