similar to: Finding the objid of a subvolume on an unmounted filesystem

If we change our default subvolume, btrfs receive will fail to find subvolume. To fix this problem, we have three ideas: 1.make btrfs snapshot ioctl support passing source subvolume''s objectid. 2.when we want to using interval subvolume path, we mount it other place that use subvolume 5 as its default subvolume. 3.tell the user to mount the toplevel subvol by himself and run receive

I was looking through some of the archives and notice a patch submitted to implement: btrfs subvolume show <path-to-subvolume> command. I also noticed that is does not appear to be in the git. This looks like a useful capability. I was trying to find out what the UUID was for a newly created subvolume and have not found out how to do that. Gene -- To unsubscribe from this

Hi. petrb@bots-bnr1:/mnt$ btrfs subvolume delete ext2_saved/ Delete subvolume ''/mnt/ext2_saved'' ERROR: cannot delete ''/mnt/ext2_saved'' this is not really very descriptive. It would be really cool if it told me why it can''t delete it. For example: Permission denied. Cannot delete ... Disk write error. Cannot delete Descriptive error messages

What happens if you set an individual file inside a subvolume as nocow (chattr +C) and then take a snapshot of that subvolume and modify the file in both? Will btrfs now ignore the nocow attribute completely or will it do "as few copies as possible"? (I''d love to know if it''s possible to visualize the fragmentation of a single file.) -- To unsubscribe from this list:

Hi Everyone, Recently i created a snapshot of an existing volume which had some amount of data. Now that after creating the snapshot i have tried deleting the same snapshot. But i am getting ENOTEMPTY for "rmdir". But when i see the actual files inside are deleted not the parent directory. From the code it looks like if (inode->i_size >

It''s been nearly a year since the patches needed to implement a reflinked copy between subvolumes have been posted (http://permalink.gmane.org/gmane.comp.file-systems.btrfs/9865 ) and I still get "Invalid cross-device link" error with Linux 3.2.4 while I try to do a cp --reflink between subvolumes. This is a *very* useful feature to have (think offline file-level

Alex pointed out the consequences after a transaction is not committed when a subvolume is deleted, so in case of a crash before an actual commit happens will let the subvolume reappear. Original post: http://www.spinics.net/lists/linux-btrfs/msg22088.html Josef''s objections: http://www.spinics.net/lists/linux-btrfs/msg22256.html While there''s no need to do a full commit for

Hi! I''m using following command to create btrfs filesystem image with predefined content: mkfs.btrfs -b 300M -r /tmp/source-root-dir rootfs.btrfs This command creates image and put everything under root subvolume (/). But I want to put everything under "/my_rootfs" subvolume. How can I accomplish this? Or can you point me the way to develop this feature in mkfs. Thanks! Best

We create two subvolumes (meego_root and meego_home) in btrfs root directory. And set meego_root as default mount subvolume. After we remount btrfs, meego_root is mounted to top directory by default. Then when we try to mount meego_home (subvol=meego_home) to a subdirectory, it failed. The problem is when default mount subvolume is set to meego_root, we search meego_home in meego_root but can not

Hello I did the following commands and resulted in a segmentation fault. [root@localhost ~]# mkfs.btrfs /dev/sda6 WARNING! - Btrfs Btrfs v0.19 IS EXPERIMENTAL WARNING! - see http://btrfs.wiki.kernel.org before using fs created label (null) on /dev/sda6 nodesize 4096 leafsize 4096 sectorsize 4096 size 46.93GB Btrfs Btrfs v0.19 [root@localhost ~]# mount /dev/sda6 /mnt/btra [root@localhost ~]#

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Is it ( yet? ) possible to manipulate the allocation policy on a subvolume level instead of the fs level? For example, to make / use raid1, and /home use raid0? Or to have / allocated from an ssd and /home allocated from the giant 2tb hd. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (GNU/Linux) Comment: Using GnuPG with Mozilla -

This testscript creates reflinks to files on different subvolumes, overwrites the original files and reflinks, and moves reflinked files between subvolumes. Originally submitted as testcase 302, changes are made based on comments from Eric: http://oss.sgi.com/archives/xfs/2013-03/msg00231.html Two new common/rc functions used in this script (_require_cp_reflink and _verify_reflink) have been

Hello, We are using btrfs filesystems in our infrastructure and, at some point of time, they start refusing to create new subvolumes. Each file system is being quota initialized immediately after its creation (with "btrfs quota enable") and then all subfolders under the root directory are created as subvolumes (btrfs subvolume create). Over time, these subvolumes may also be

A subvolume cannot be deleted via rmdir, but the error code ENOTEMPTY is confusing. Return EPERM instead, as this is not permitted. Signed-off-by: David Sterba <dsterba@suse.cz> --- fs/btrfs/inode.c | 5 +++-- 1 files changed, 3 insertions(+), 2 deletions(-) diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index a4167ef..a67dadd 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@

Hi Anthony, I think that for you may be interested to read this thread http://kerneltrap.org/mailarchive/linux-btrfs/2009/11/20/6588643/thread and to read a my blog about this argument http://kreijack.blogspot.com/2010/01/linux-btrfs-example-of-layout.html Regards Goffredo >----Messaggio originale---- >Da: anthony@extof.me >Data: 19/05/2010 8.50 >A:

I''m wondering is space really freed after deleting large subvolume? Will space be immediately available to other data like other subvolumes? -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html

If we change our default subvolume, btrfs receive will fail to find subvolume. To fix this problem, i have two ideas. 1.make btrfs snapshot ioctl support passing source subvolume''s objectid 2.when we want to using interval subvolume path, we mount it other place that use subvolume 5 as its default subvolume. We''d better use the second approach because it won''t bother

This testscript creates reflinks to files on different subvolumes, overwrites the original files and reflinks, and moves reflinked files between subvolumes. Originally submitted as testcase 302, changes are made based on comments from Eric: http://oss.sgi.com/archives/xfs/2013-03/msg00231.html Two new common/rc functions used in this script (_require_cp_reflink and _verify_reflink) have been

New option to subvolume list that acts as a global filter and applies the other filters to either live subvolumes or the uncleaned ones. The path to the deleted subvolumes is lost at the deletion time, sample output looks like: ID 259 gen 7 top level 0 path <FS_TREE>/DELETED Signed-off-by: David Sterba <dsterba@suse.cz> --- btrfs-list.c | 24 +++++++++++++++++++++---

"btrfs subvolume list" gets a new option "--fields=..." which allows to specify which pieces of information about subvolumes shall be printed. This is necessary because this commit also adds all the so far missing items from the root_item like the received UUID, all generation values and all time values. The parameters to the "--fields" option is a list of items to