![]() What has happened is that the filesystem has allocated all of the available space to either data or metadata, and then one of those has filled up (usually, it's the metadata space that does this). Note that the Metadata used value is fairly close (75% or more) to the Metadata total value, but there's lots of Data space left. Next, check how much of your metadata allocation has been used up: Note that in this case, all of the devices (the only device) in the filesystem are fully utilised. I get "No space left on device" errors, but df says I've got lots of spaceįirst, check how much space has been allocated on your filesystem: You might also want to report to your distribution that their configuration without udev is missing this device. However, if you are not using udev, you will need to create it yourself: You are missing the /dev/btrfs-control device node. I get the message "failed to open /dev/btrfs-control skipping device registration" from "btrfs dev scan" You've just copied a large file, but still it consumed free space. (Probably not to waste too much CPU time on bad compressing data). The reason why "compress" ratios are so low is because btrfs very easily backs out of compress decision. This way you make the btrfs to compress everything. If yes, and ratios are unsatisfactory, then you might try "compress-force" option. If you want to defragment the contents of a directory, you have to use the recursive mode with the -r flag (see recursive defragmentation).Ĭompression doesn't work / poor compression ratiosįirst of all make sure you have passed "compress" mount option in fstab or mount command. When ran on a directory, it defragments the metadata held by the subvolume containing the directory, and not the contents of the directory. btrfs fi defrag operates on the single filesystem object passed to it, e.g. Unsorted/uncategorized Defragmenting a directory doesn't workĭoes not defragment the contents of the directory. The restore tool is a non-destructive way to dump data to a backup drive and may be able to recover some or all of your data, even if we can't save the existing filesystem. My filesystem won't mount and none of the above helped. This should be in many distributions' startup scripts (and initrd images, if your root filesystem is btrfs), but you may have to add it yourself. Then you need to ensure that you run a btrfs device scan first: Or if one volume of a multi-volume filesystem fails when mounting, but the other succeeds: In some cases useful info is found in syslog - try Missing codepage or helper program, or other error ![]() Mount: wrong fs type, bad option, bad superblock on /dev/sdd2, If you have labelled your filesystem and put it in /etc/fstab, but you get: Only one disk of a multi-volume filesystem will mount Then you should try using btrfs rescure zero-log (see Manpage/btrfs-rescue). ? btree_read_extent_buffer_pages+0x76/0xbc One of these may work successfully.įinally, if and only if the kernel oops in your logs has something like this in the middle of it, Second, try mounting with options -o recovery or -o ro or -o recovery,ro (using the new kernel). If you have your kernel on a btrfs filesystem, then you will probably have to find a recovery disk with a recent kernel on it. Mount/unmount problems I can't mount my filesystem, and I get a kernel oops!įirst, update your kernel to the latest one available and try mounting again. Please attach files (like logs or dumps) directly to the bug and don't use pastebin-like services. If you include kernel log backtraces in bug reports sent to the mailing list, please disable word wrapping in your mail user agent to keep the kernel log in a readable format. Please use btrfs-progs somewhere in the bug subject if you're reporting a bug for the userspace tools. For quick questions you may want to join the IRC #btrfs channel on libera.chat (and stay around for some time in case you do not get the answer right away). Please report bugs on Bugzilla on (requires registration) setting the component to Btrfs, and report bugs and issues to the mailing list ( you are not required to subscribe). General topics How do I report bugs and issues? 3.5 I get "No space left on device" errors, but df says I've got lots of space.3.4 I get the message "failed to open /dev/btrfs-control skipping device registration" from "btrfs dev scan".3.2 Compression doesn't work / poor compression ratios.3.1 Defragmenting a directory doesn't work.2.4 My filesystem won't mount and none of the above helped.2.3 Only one disk of a multi-volume filesystem will mount.2.2 Filesystem can't be mounted by label.2.1 I can't mount my filesystem, and I get a kernel oops!.
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