similar to: Auto-sparseifying

Hi, Say I download a large file from the net to /mnt/a.iso. I then download the same file again to /mnt/b.iso. These files now have the same content, but are stored twice since the copies weren''t made with the bcp utility. The same occurs if a directory tree with duplicate files (created with bcp) is put through a non-aware program - for example tarred and then untarred again. This

SAMSUNG SSD 830 Series CPU0: Intel® Core(TM) i7-2820QM CPU @ 2.30GHz (fam: 06, model: 2a, stepping: 07) 8GB RAM (quite heavily tested, not recently, with several days of memtest) kernel 3.11.1-200.fc19.x86_64 running on baremetal btrfs-progs-0.20.rc1.20130308git704a08c-1.fc19.x86_64 Today I did a scrub on a btrfs volume, with no message or errors in console or dmesg or journal. Immediately after

Hey all, Just did a btrfs balance on a single device. Before the balance operation here is the df result: inglor@tiamat ~$ btrfs fi df /home Data: total=19.19GB, used=9.34GB System, DUP: total=32.00MB, used=4.00KB Metadata, DUP: total=896.00MB, used=227.98MB Then I issues a balance operation relocating the chunks across a single device: inglor@tiamat ~$ sudo btrfs fi balance /home [sudo]

I have a 3 disk raid1 filesystem mounted with nodatacow. I have a folder in said filesystem with the ''C'' NOCOW & ''Z'' Not_Compressed flags set for good measure. I then copy in a large file and proceed to make random modifications. Filefrag shows no additional extents created, good so far. A big thank you to the those devs who got that working. However, after

Hi, I am using 2.6.36.3 kernel with btrfs, 512MB memory and a very slow disk, no special options for mounting btrfs except noatime. Now I found it very slow. When I rm a 5GB movie, it took 20 secs. -- 竹密岂妨流水过 山高哪阻野云飞 -- 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

Very low priority. No user data at risk. 8GB virtual disk being installed to, and the installer is puking. I''m trying to figure out why. I first get an rsync error 12, followed by the installer crashing. What''s interesting is this, deleting irrelevant source file systems, just showing the mounts for the installed system: [root@localhost tmp]# df Filesystem

Hi, If i set strict allocate = yes in samba to speed up the transfer of a mssql database dump, then btrfs does not compress the file. I have tried it also by just copying a small file in Windows to the samba share and the same. I have tried btrfs mount options autodefrag and then btrfs fi defrag -c and the file still does not get compressed. I have tried kernels 3.6.11, 3.8 and 3.10.7 on FC16

----- Forwarded Message ----- From: "Stefan Hajnoczi" <stefanha@redhat.com> To: "Eric Sandeen" <sandeen@redhat.com> Cc: virt-devel@redhat.com, "Kevin Wolf" <kwolf@redhat.com> Sent: Friday, November 22, 2013 9:20:51 AM Subject: [virt-devel] btrfs NOCOW for VM disk images Hi, In upstream QEMU we''re discussing patches that set the NOCOW flag

Hello everyone, Btrfs v0.16 is available for download, please see http://btrfs.wiki.kernel.org/ for download links and project information. v0.16 has a shiny new disk format, and is not compatible with filesystems created by older Btrfs releases. But, it should be the fastest Btrfs yet, with a wide variety of scalability fixes and new features. There were quite a few contributors this time

Hello, Trying to balance a 2TB filesystem on the 3.8.5 kernel: Label: ''p2'' uuid: 01f6cc8b-d305-40e1-bac8-8fdd548f611e Total devices 1 FS bytes used 1.32TB devid 1 size 1.80TB used 1.37TB path /dev/sda2 System: total=4.00MB, used=156.00KB Data+Metadata: total=1.37TB, used=1.32TB I am getting a Segmentation fault in ''btrfs'' utility, and following in

Hello, This patch series adds an initial implementation of restriper (it''s a clever name for relocation framework that allows to do selective profile changing and selective balancing with some goodies like pausing/resuming and reporting progress to the user. Profile changing is global (per-FS) so far, per-subvolume profiles require some discussion and can be implemented in future.

If there is no free space, the free space allocator will try to get space from the block group with the degenerated profile. For example, if there is no free space in the RAID1 block groups, the allocator will try to allocate space from the DUP block groups. And besides that, the space reservation has the similar behaviour: if there is no enough space in the space cache to reserve, it will reserve

I''ve been monitoring the lists for a while now but didn''t see this problem mentioned in particular: I''ve got a fairly standard desktop system at home, 700gb WD drive, nothing special, with 2 btrfs filesystems and some snapshots. The system runs for days, and I''ve noticed unusual disk activity the other evening - turns out that it''s taking forever to

The biggest one is a fix for fstrim, and there''s a fix for on-disk free space cache. Others are small fixes and cleanups. The last three have been sent weeks ago. The patchset is also available in this repo: git://repo.or.cz/linux-btrfs-devel.git for-chris Note there''s a small confict with Al Viro''s vfs changes. Li Zefan (11): Btrfs: add pinned extents to

Hi everybody, I am using btrfs as my main fs for some time now, but I am experiencing severe performance drawbacks. I can''t qualify the circumstances, but sometimes during disc access the whole system freezes for some time. Maybe somebody could suggest some general things I could try to search for the problem? Thanks in advance, Florian --- Some background information: $ mount |

Back story: I started my pool with a 200gb partition at the end of my drive (sdc5) , until I was able to clear out the data at the beginning of my drive. When I was ready, I ran `btrfs dev add /dev/sdc4 /` then `btrfs dev del /dev/sdc5 /`, $ sudo btrfs fi resize max / Resize ''/'' of ''max'' ERROR: unable to resize ''/'' - Invalid argument in

Hallo, "never change a running system" ... For some months I run btrfs unter kernel 3.2.5 and 3.2.9, without problems. Yesterday I compiled kernel 3.3.4, and this morning I started the machine with this kernel. There may be some ugly problems. Copying something into the btrfs "directory" worked well for some files, and then I got error messages (I''ve not

Hello, This patch fixes the nodatacow check. The new test function can always detect extents referenced by multiple snatshots. If a extent was allocated in recent two transactions and no snapshot happened in these two transactions, we can always avoid cow. To check given extent''s reference, the test function walks down old tree root, then check backref info in the path. This initial

Hello, some time ago we discussed on #btrfs that the nocow attribute for files wasn''t working (around 3.3 or 3.4 kernels). That was evident by files fragmenting even with the attribute set. Chris mentioned to find a fix quickly for that, and posted some lines of change into irc. But recently someone mentioned that 3.6-rc looks like still not respecting nocow for files. Is there really

I need everybody to go over this with a fine toothed comb since it is a pretty big change. I think it is right and it seems to come out right, but if it''s not it will mean we screw up O_DIRECT on snapshotted files with preallocated extents, so please, make sure it is correct :). --- Subject: [PATCH] Btrfs: rework can_nocow_odirect We are always doing the file extent lookup in here