6 btrfs-zero-log - clear out log tree
10 *btrfs-zero-log* <dev>
14 *btrfs-zero-log* will remove the log tree if log tree is corrupt, which will
15 allow you to mount the filesystem again.
17 The common case where this happens has been fixed a long time ago,
18 so it is unlikely that you will see this particular problem.
20 One can determine whether *btrfs-zero-log* is needed according to the kernel
23 ? replay_one_dir_item+0xb5/0xb5 [btrfs]
24 ? walk_log_tree+0x9c/0x19d [btrfs]
25 ? btrfs_read_fs_root_no_radix+0x169/0x1a1 [btrfs]
26 ? btrfs_recover_log_trees+0x195/0x29c [btrfs]
27 ? replay_one_dir_item+0xb5/0xb5 [btrfs]
28 ? btree_read_extent_buffer_pages+0x76/0xbc [btrfs]
29 ? open_ctree+0xff6/0x132c [btrfs]
32 If the errors are like above, then *btrfs-zero-log* should be used to clear
33 the log and the filesystem may be mounted normally again.
35 NOTE: If you use btrfs as the root filesystem, you may want to include
36 *btrfs-zero-log* into initramdisk if the log problems hits you often.
40 *btrfs-zero-log* will return 0 if no error happened.
41 Other exit code means some problems happened.
45 Written by Shilong Wang and Wenruo Qu.
49 Copyright (C) 2013 FUJITSU LIMITED.
51 License GPLv2: GNU GPL version 2 <http://gnu.org/licenses/gpl.html>.
53 This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.