BTRFS-RESCUE(8) Btrfs Manual BTRFS-RESCUE(8) NAME btrfs-rescue - Recover a damaged btrfs filesystem SYNOPSIS btrfs rescue <subcommand> <args> DESCRIPTION btrfs rescue is used to try to recover a damaged btrfs filesystem. SUBCOMMAND chunk-recover [options] <device> Recover the chunk tree by scanning the devices Options -y assume an answer of yes to all questions. -v verbose mode. -h help. Note Since chunk-recover will scan the whole device, it will be VERY slow especially executed on a large device. super-recover [options] <device> Recover bad superblocks from good copies. Options -y assume an answer of yes to all questions. -v verbose mode. zero-log <device> clear the filesystem log tree This command will clear the filesystem log tree. This may fix a specific set of problem when the filesystem mount fails due to the log replay. See below for sample stacktraces that may show up in system log. The common case where this happens has been fixed a long time ago, so it is unlikely that you will see this particular problem, but the utility is kept around. Note clearing the log may lead to loss of changes that were made since the last transaction commit. This may be up to 30 seconds (default commit period) or less if the commit was implied by other filesystem activity. One can determine whether zero-log is needed according to the kernel backtrace: ? replay_one_dir_item+0xb5/0xb5 [btrfs] ? walk_log_tree+0x9c/0x19d [btrfs] AVAILABILITY btrfs is part of btrfs-progs. Please refer to the btrfs wiki http://btrfs.wiki.kernel.org for further details. SEE ALSO mkfs.btrfs(8), btrfs-scrub(8), btrfs-check(8) Btrfs v4.4.1 11/05/2016 BTRFS-RESCUE(8)