Re: Receive fails (Could not find parent subvolume)

[Joshua Varghese <jvarghese@ocztechnology.com>]

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Thank you. it worked with 3.12.0 :)

On Fri 22 Nov 2013 10:44:41 GMT, Joshua wrote:
> Hi Stefan,
>
> Thank you for replying. I am running on a 3.10 kernel, will upgrade it
> and check.
>
> Regards
>
> On Fri 22 Nov 2013 10:34:08 GMT, Stefan Behrens wrote:
>> Re: Receive fails (Could not find parent subvolume)
>>
>> On Fri, 22 Nov 2013 01:47:43 -0800, Joshua Varghese wrote:
>> > Hi,
>> >
>> > I'm trying to implement a mechanism for incremental backup using
>> btrfs.
>> > I have two hardisks and each has a btrfs partition on it. I am able to
>> > take a snapshot of the source partition and send it to the backup disk
>> > using the send-recieve mechanism. When I try to send an incremental
>> > backup of a new snapshot with the previous snapshot as the parent
>> btrfs
>> > command complains (ERROR: could not find parent subvolume). The kernel
>> > logs also record a error (kernel: could not find root 9). I've listed
>> > the actual commands and their outputs below. Please let me know if you
>> > need any more information.
>> >
>> > # btrfs sub create check_backup
>> > /Create subvolume './check_backup/
>> > # touch check_backup/before_first_snap
>> > # btrfs sub snapshot -r check_backup/ first_snap
>> > /Create a readonly snapshot of 'check_backup/' in './first_snap'/
>> > # btrfs sub snapshot -r check_backup/ second_snap
>> > /Create a readonly snapshot of 'check_backup/' in './second_snap'/
>> >
>> > <second volume mounted at /mnt/gentoo/>
>> > # btrfs send  first_snap | btrfs receive /mnt/gentoo/backup/test/
>> > /At subvol first_snap//
>> > //At subvol first_snap//
>> > /# btrfs send  -p first_snap second_snap/ | btrfs receive
>> > /mnt/gentoo/backup/test/
>> > /At subvol second_snap///
>> > //At snapshot second_snap//
>> > //ioctl(BTRFS_IOC_TREE_SEARCH, uuid, key 40e9283cdf98a796, UUID_KEY,
>> > 0fc9a258f8cd8da7) ret=-1, //error: No such file or directory//
>> > //ERROR: could not find parent subvolume//
>> > /
>> > /(kernel log): kernel: could not find root 9/
>>
>> Works for me.
>>
>> How old is your kernel (which version)? You need 3.12 or better if you
>> use the most recent btrfs-progs. New progs and old kernel doesn't work
>> in this case, new kernel and old progs would work.
>>
>>
>> > As I understand the send command would take a difference between
>> the two
>> > snapshots and the send it to the receive. I used the file mechanism
>> > instead of the pipe and realized that the receive is the one that
>> complains.
>> > I'd also read in the documentation
>> >
>> (http://docs.oracle.com/cd/E37670_01/E37355/html/ol_sendrecv_btrfs.hml)
>> > about clone source. I don't understand its implication in incremental
>> > backup.
>> >
>> > Regards,
>> > Josh
>>

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