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Btrfs snapshot as user is not permitted

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My backup user should be able to create a btrfs snapshot of the system subvolume (mounted at /). But this doesent work.

Setup: subvol=/rootfs is mounted on / and subvol=/ is mounted on /btrfs

First:

root# mkdir /btrfs/backup && chown backup:backup /btrfs/backup

then as backup user:

backup$ btrfs subvol snapshot / /btrfs/backup/rootfs

Create a snapshot of '/' in '/btrfs/backup/rootfs'

ERROR: cannot snapshot '/': Operation not permitted

If I change the owner of / to be the backup user, it works, but is this the right way?

Ubuntu 16.04 / Linux 4.4.0-59-generic / btrfs-progs v4.4

linux permissions security backup btrfs

share|improve this question

asked Jan 30 '17 at 10:20

jonasjonas

111

add a comment | 

1

1

My backup user should be able to create a btrfs snapshot of the system subvolume (mounted at /). But this doesent work.

Setup: subvol=/rootfs is mounted on / and subvol=/ is mounted on /btrfs

First:

root# mkdir /btrfs/backup && chown backup:backup /btrfs/backup

then as backup user:

backup$ btrfs subvol snapshot / /btrfs/backup/rootfs

Create a snapshot of '/' in '/btrfs/backup/rootfs'

ERROR: cannot snapshot '/': Operation not permitted

If I change the owner of / to be the backup user, it works, but is this the right way?

Ubuntu 16.04 / Linux 4.4.0-59-generic / btrfs-progs v4.4

linux permissions security backup btrfs

share|improve this question

asked Jan 30 '17 at 10:20

jonasjonas

111

add a comment | 

My backup user should be able to create a btrfs snapshot of the system subvolume (mounted at /). But this doesent work.

Setup: subvol=/rootfs is mounted on / and subvol=/ is mounted on /btrfs

First:

root# mkdir /btrfs/backup && chown backup:backup /btrfs/backup

then as backup user:

backup$ btrfs subvol snapshot / /btrfs/backup/rootfs

Create a snapshot of '/' in '/btrfs/backup/rootfs'

ERROR: cannot snapshot '/': Operation not permitted

If I change the owner of / to be the backup user, it works, but is this the right way?

Ubuntu 16.04 / Linux 4.4.0-59-generic / btrfs-progs v4.4

linux permissions security backup btrfs

share|improve this question

asked Jan 30 '17 at 10:20

jonasjonas

111

root# mkdir /btrfs/backup && chown backup:backup /btrfs/backup

backup$ btrfs subvol snapshot / /btrfs/backup/rootfs

Create a snapshot of '/' in '/btrfs/backup/rootfs'

ERROR: cannot snapshot '/': Operation not permitted

share|improve this question

asked Jan 30 '17 at 10:20

jonasjonas

111

share|improve this question

asked Jan 30 '17 at 10:20

jonasjonas

111

asked Jan 30 '17 at 10:20

jonasjonas

111

asked Jan 30 '17 at 10:20

jonasjonas

111

1 Answer
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Firstly, I see that you make a directory, not a subvolume.

btrfs subvolume create /path/to/the/location/…/subvolume-name

Secondly, the owner of a directory is different from a simple dir than a mount pont directory. In the second case, it's owned by root. So you must mount it and then, chown the directory mountpoint.

share|improve this answer

edited 7 hours ago

Rui F Ribeiro

42.1k1484142

answered Mar 18 '17 at 17:41

Anon's sampleAnon's sample

1

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thanks, but this does not really help me. I try to make a snapshot as user (not as root), which is not permitted even if the destination directory is owned by said user.
  
  – jonas
  Mar 21 '17 at 9:07
  

  
  
  
  

add a comment | 

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0

Firstly, I see that you make a directory, not a subvolume.

btrfs subvolume create /path/to/the/location/…/subvolume-name

Secondly, the owner of a directory is different from a simple dir than a mount pont directory. In the second case, it's owned by root. So you must mount it and then, chown the directory mountpoint.

share|improve this answer

edited 7 hours ago

Rui F Ribeiro

42.1k1484142

answered Mar 18 '17 at 17:41

Anon's sampleAnon's sample

1

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thanks, but this does not really help me. I try to make a snapshot as user (not as root), which is not permitted even if the destination directory is owned by said user.
  
  – jonas
  Mar 21 '17 at 9:07
  

  
  
  
  

add a comment | 

0

Firstly, I see that you make a directory, not a subvolume.

btrfs subvolume create /path/to/the/location/…/subvolume-name

Secondly, the owner of a directory is different from a simple dir than a mount pont directory. In the second case, it's owned by root. So you must mount it and then, chown the directory mountpoint.

share|improve this answer

edited 7 hours ago

Rui F Ribeiro

42.1k1484142

answered Mar 18 '17 at 17:41

Anon's sampleAnon's sample

1

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thanks, but this does not really help me. I try to make a snapshot as user (not as root), which is not permitted even if the destination directory is owned by said user.
  
  – jonas
  Mar 21 '17 at 9:07
  

  
  
  
  

add a comment | 

Firstly, I see that you make a directory, not a subvolume.

btrfs subvolume create /path/to/the/location/…/subvolume-name

Secondly, the owner of a directory is different from a simple dir than a mount pont directory. In the second case, it's owned by root. So you must mount it and then, chown the directory mountpoint.

share|improve this answer

edited 7 hours ago

Rui F Ribeiro

42.1k1484142

answered Mar 18 '17 at 17:41

Anon's sampleAnon's sample

1

share|improve this answer

edited 7 hours ago

Rui F Ribeiro

42.1k1484142

answered Mar 18 '17 at 17:41

Anon's sampleAnon's sample

1

edited 7 hours ago

Rui F Ribeiro

42.1k1484142

edited 7 hours ago

Rui F Ribeiro

42.1k1484142

answered Mar 18 '17 at 17:41

Anon's sampleAnon's sample

1

answered Mar 18 '17 at 17:41

Anon's sampleAnon's sample

1