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problems with btrfs send / restore

DISCUSSION Stefan Priebe 4 participants 9 messages Oct 11, 2012 – Oct 16, 2012 Btrfs file system

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Stefan Priebe

author
#0 lore raw

Hello list,

i wanted to try to out btrfs send and restore but i'm failing on a simple step:

[server: /btrfs/target]# btrfs send /btrfs/src/\@snapshot/1 | btrfs receive /btrfs/target/\@snapshot/ At subvol /btrfs/src/@snapshot/1
At subvol 1
[server: /btrfs/target]# ls -la /btrfs/target/\@snapshot/
total 4
drwxr-xr-x 1 root root 2 Oct 11 20:25 .
dr-xr-xr-x 1 root root 18 Oct 11 20:25 ..
dr-xr-xr-x 1 root root 52 Oct 10 23:52 1

<= works fine

[server: /btrfs/target]# btrfs send -i /btrfs/src/\@snapshot/1 /btrfs/src/\@snapshot/2 | btrfs receive /btrfs/target/\@snapshot/ At subvol /btrfs/src/@snapshot/2
At subvol 2
ERROR: failed to open /btrfs/target/@snapshot/@snapshot/1/test.tar. No such file or directory

Stefan

#1 lore raw
Quoted 5 lines · Stefan Priebe

[server: /btrfs/target]# btrfs send -i /btrfs/src/\@snapshot/1 /btrfs/src/\@snapshot/2 | btrfs receive /btrfs/target/\@snapshot/
At subvol /btrfs/src/@snapshot/2
At subvol 2
ERROR: failed to open /btrfs/target/@snapshot/@snapshot/1/test.tar. No such file or directory

                                      ^^^^^^^^^^^^^^^^^^^

I wonder if this is the ghost snapshot dir entry that Miao fixed. Did somehow get into the 'send' stream and confused the receive side.

david

author
#2 lore raw

Am 11.10.2012 21:43, schrieb David Sterba:

Quoted 6 lines · Stefan Priebe
Quoted 5 lines

[server: /btrfs/target]# btrfs send -i /btrfs/src/\@snapshot/1 /btrfs/src/\@snapshot/2 | btrfs receive /btrfs/target/\@snapshot/
At subvol /btrfs/src/@snapshot/2
At subvol 2
ERROR: failed to open /btrfs/target/@snapshot/@snapshot/1/test.tar. No such file or directory

Quoted 6 lines
                                       ^^^^^^^^^^^^^^^^^^^

I wonder if this is the ghost snapshot dir entry that Miao fixed. Did somehow get into the 'send' stream and confused the receive side.

david

i missed two facts:
1.) vanilla kernel 3.6.1
2.) latest btrfs tools git (cloned at 10/10/2012)

Stefan

#3 lore raw
Quoted 9 lines · Stefan Priebe

Am 11.10.2012 21:43, schrieb David Sterba:

Quoted 8 lines · Stefan Priebe
Quoted 5 lines

[server: /btrfs/target]# btrfs send -i /btrfs/src/\@snapshot/1 /btrfs/src/\@snapshot/2 | btrfs receive /btrfs/target/\@snapshot/
At subvol /btrfs/src/@snapshot/2
At subvol 2
ERROR: failed to open /btrfs/target/@snapshot/@snapshot/1/test.tar. No such file or directory

                                       ^^^^^^^^^^^^^^^^^^^
Quoted 8 lines
Quoted 4 lines

I wonder if this is the ghost snapshot dir entry that Miao fixed. Did somehow get into the 'send' stream and confused the receive side.

david

i missed two facts:
1.) vanilla kernel 3.6.1
2.) latest btrfs tools git (cloned at 10/10/2012)

Sorry, I can not reproduce this problem, could you send me the detailed steps?

Thanks
Miao

Quoted 7 lines

Stefan

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author
#4 lore raw

Am 15.10.2012 12:16, schrieb Miao Xie:

Quoted 13 lines · Stefan Priebe
Quoted 12 lines

Am 11.10.2012 21:43, schrieb David Sterba:

Quoted 11 lines · Stefan Priebe
Quoted 5 lines

[server: /btrfs/target]# btrfs send -i /btrfs/src/\@snapshot/1 /btrfs/src/\@snapshot/2 | btrfs receive /btrfs/target/\@snapshot/
At subvol /btrfs/src/@snapshot/2
At subvol 2
ERROR: failed to open /btrfs/target/@snapshot/@snapshot/1/test.tar. No such file or directory

                                        ^^^^^^^^^^^^^^^^^^^

I wonder if this is the ghost snapshot dir entry that Miao fixed. Did somehow get into the 'send' stream and confused the receive side.

Quoted 7 lines
Quoted 5 lines
Quoted 1 line

david

i missed two facts:
1.) vanilla kernel 3.6.1
2.) latest btrfs tools git (cloned at 10/10/2012)

Sorry, I can not reproduce this problem, could you send me the detailed steps?

mhm there is nothing special. But i try to provide more information / a small howto:

# mount |grep btrfs
/dev/sdb on /btrfs/src type btrfs (rw)
/dev/sdc on /btrfs/target type btrfs (rw)
# btrfs subvolume list /btrfs/target/
# btrfs subvolume list /btrfs/src/
ID 277 top level 5 path @snapshot/1
ID 278 top level 5 path @snapshot/2
ID 288 top level 5 path @snapshot/3
# btrfs send /btrfs/src/\@snapshot/1 | btrfs receive /btrfs/target/\@snapshot/
At subvol /btrfs/src/@snapshot/1
At subvol 1
#

Now i was trying to send an incremental snapshot:

# btrfs send -i /btrfs/src/\@snapshot/1 /btrfs/src/\@snapshot/2 | btrfs receive /btrfs/target/\@snapshot/
At subvol /btrfs/src/@snapshot/2
At subvol 2
ERROR: failed to open /btrfs/target/@snapshot/@snapshot/1/test.tar. No such file or directory
#

Greets,
Stefan

#5 lore raw

Hi Stefan,

Is /btrfs/target/\@snapshot/ a subvolume or a directory?

can you pls try the patch that I posted here:
http://www.spinics.net/lists/linux-btrfs/msg19583.html

I feel that you're hitting a similar issue here. Before you apply the patch, please verify that you have /etc/mtab on your system (I will make a more formal patch later).

Thanks,
Alex.

Quoted 68 lines · Stefan Priebe

Am 15.10.2012 12:16, schrieb Miao Xie:

Quoted 21 lines · Stefan Priebe
Quoted 20 lines

Am 11.10.2012 21:43, schrieb David Sterba:

Quoted 16 lines · Stefan Priebe
Quoted 7 lines

[server: /btrfs/target]# btrfs send -i /btrfs/src/\@snapshot/1 /btrfs/src/\@snapshot/2 | btrfs receive /btrfs/target/\@snapshot/ At subvol /btrfs/src/@snapshot/2
At subvol 2
ERROR: failed to open /btrfs/target/@snapshot/@snapshot/1/test.tar. No such file or directory

                                        ^^^^^^^^^^^^^^^^^^^

I wonder if this is the ghost snapshot dir entry that Miao fixed. Did somehow get into the 'send' stream and confused the receive side.

david

Quoted 7 lines
Quoted 3 lines

i missed two facts:
1.) vanilla kernel 3.6.1
2.) latest btrfs tools git (cloned at 10/10/2012)

Sorry, I can not reproduce this problem, could you send me the detailed steps?

mhm there is nothing special. But i try to provide more information / a small howto:

# mount |grep btrfs
/dev/sdb on /btrfs/src type btrfs (rw)
/dev/sdc on /btrfs/target type btrfs (rw)
# btrfs subvolume list /btrfs/target/
# btrfs subvolume list /btrfs/src/
ID 277 top level 5 path @snapshot/1
ID 278 top level 5 path @snapshot/2
ID 288 top level 5 path @snapshot/3
# btrfs send /btrfs/src/\@snapshot/1 | btrfs receive
/btrfs/target/\@snapshot/
At subvol /btrfs/src/@snapshot/1
At subvol 1
#

Now i was trying to send an incremental snapshot:

# btrfs send -i /btrfs/src/\@snapshot/1 /btrfs/src/\@snapshot/2 | btrfs
receive /btrfs/target/\@snapshot/
At subvol /btrfs/src/@snapshot/2
At subvol 2
ERROR: failed to open /btrfs/target/@snapshot/@snapshot/1/test.tar. No such
file or directory
#

Greets,

Stefan
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author
#6 lore raw

Am 15.10.2012 21:42, schrieb Alex Lyakas:

Quoted 1 line

Is /btrfs/target/\@snapshot/ a subvolume or a directory?

A simple directory.

Quoted 6 lines

can you pls try the patch that I posted here:
http://www.spinics.net/lists/linux-btrfs/msg19583.html

I feel that you're hitting a similar issue here. Before you apply the patch, please verify that you have /etc/mtab on your system (I will make a more formal patch later).

With your patch it works FINE!! Great!

Another problem i'm seeing is:

# btrfs send -i /btrfs/src/\@snapshot/1 /btrfs/src/\@snapshot/2 | btrfs receive /btrfs/target/\@snapshot/
At subvol /btrfs/src/@snapshot/2
ERROR: Failed to lookup path for root 0 - No such file or directory
ERROR: unable to resolve path for root 350

Then i have to wait some seconds and the same command works fine. I see the same with btrfs subvolume list PATH

and it is unrelated to your patch.

Stefan

#7 lore raw

Stefan,
the second issue you're seeing was discussed here:
http://www.spinics.net/lists/linux-btrfs/msg19672.html

You can apply the patch I sent there meanwhile, but as Miao pointed out, I will need to make a better patch (hope will do it soon, together with this one).

Thanks,
Alex.

Quoted 31 lines · Stefan Priebe

Am 15.10.2012 21:42, schrieb Alex Lyakas:

Quoted 1 line

Is /btrfs/target/\@snapshot/ a subvolume or a directory?

A simple directory.

Quoted 6 lines

can you pls try the patch that I posted here:
http://www.spinics.net/lists/linux-btrfs/msg19583.html

I feel that you're hitting a similar issue here. Before you apply the patch, please verify that you have /etc/mtab on your system (I will make a more formal patch later).

With your patch it works FINE!! Great!

Another problem i'm seeing is:

# btrfs send -i /btrfs/src/\@snapshot/1 /btrfs/src/\@snapshot/2 | btrfs
receive /btrfs/target/\@snapshot/
At subvol /btrfs/src/@snapshot/2
ERROR: Failed to lookup path for root 0 - No such file or directory
ERROR: unable to resolve path for root 350

Then i have to wait some seconds and the same command works fine. I see the same with btrfs subvolume list PATH

and it is unrelated to your patch.

Stefan

author
#8 lore raw

Am 15.10.2012 22:14, schrieb Alex Lyakas:

Quoted 7 lines

Stefan,
the second issue you're seeing was discussed here:
http://www.spinics.net/lists/linux-btrfs/msg19672.html

You can apply the patch I sent there meanwhile, but as Miao pointed out, I will need to make a better patch (hope will do it soon, together with this one).

ah OK thanks. So i hope we'll see an updated btrfs-progs git repo soon ;-)

Thanks!

Stefan