btrfs-zero-log man page on Alpinelinux
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BTRFS-ZERO-LOG(8) Btrfs Manual BTRFS-ZERO-LOG(8)
NAME
btrfs-zero-log - clear out log tree
SYNOPSIS
btrfs-zero-log <dev>
DESCRIPTION
btrfs-zero-log will remove the log tree if log tree is corrupt, which
will allow you to mount the filesystem again.
The common case where this happens has been fixed a long time ago, so
it is unlikely that you will see this particular problem.
One can determine whether btrfs-zero-log is needed according to the
kernel backtrace:
? replay_one_dir_item+0xb5/0xb5 [btrfs]
? walk_log_tree+0x9c/0x19d [btrfs]
? btrfs_read_fs_root_no_radix+0x169/0x1a1 [btrfs]
? btrfs_recover_log_trees+0x195/0x29c [btrfs]
? replay_one_dir_item+0xb5/0xb5 [btrfs]
? btree_read_extent_buffer_pages+0x76/0xbc [btrfs]
? open_ctree+0xff6/0x132c [btrfs]
If the errors are like above, then btrfs-zero-log should be used to
clear the log and the filesystem may be mounted normally again.
Note
If you use btrfs as the root filesystem, you may want to include
btrfs-zero-log into initramdisk if the log problems hits you often.
EXIT STATUS
btrfs-zero-log will return 0 if no error happened. Other exit code
means some problems happened.
AUTHOR
Written by Shilong Wang and Wenruo Qu.
COPYRIGHT
Copyright © 2013 FUJITSU LIMITED.
License GPLv2: GNU GPL version 2 http://gnu.org/licenses/gpl.html.
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
SEE ALSO
mkfs.btrfs(8)
Btrfs v3.14.2 05/30/2014 BTRFS-ZERO-LOG(8)
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