2014-04-02 08:29:35 +00:00
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btrfs-zero-log(8)
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=================
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NAME
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----
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btrfs-zero-log - clear out log tree
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SYNOPSIS
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--------
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2014-05-19 15:49:35 +00:00
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*btrfs-zero-log* <dev>
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2014-04-02 08:29:35 +00:00
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DESCRIPTION
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-----------
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2014-05-19 15:49:35 +00:00
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*btrfs-zero-log* will remove the log tree if log tree is corrupt, which will
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2014-04-02 08:29:35 +00:00
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allow you to mount the filesystem again.
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The common case where this happens has been fixed a long time ago,
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so it is unlikely that you will see this particular problem.
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2014-05-19 15:49:35 +00:00
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One can determine whether *btrfs-zero-log* is needed according to the kernel
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2014-04-11 02:43:53 +00:00
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backtrace:
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? replay_one_dir_item+0xb5/0xb5 [btrfs]
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? walk_log_tree+0x9c/0x19d [btrfs]
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? btrfs_read_fs_root_no_radix+0x169/0x1a1 [btrfs]
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? btrfs_recover_log_trees+0x195/0x29c [btrfs]
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? replay_one_dir_item+0xb5/0xb5 [btrfs]
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? btree_read_extent_buffer_pages+0x76/0xbc [btrfs]
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? open_ctree+0xff6/0x132c [btrfs]
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----
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2014-05-19 15:49:35 +00:00
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If the errors are like above, then *btrfs-zero-log* should be used to clear
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2014-04-11 02:43:53 +00:00
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the log and the filesystem may be mounted normally again.
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NOTE: If you use btrfs as the root filesystem, you may want to include
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2014-05-19 15:49:35 +00:00
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*btrfs-zero-log* into initramdisk if the log problems hits you often.
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2014-04-11 02:43:53 +00:00
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2014-04-02 08:29:35 +00:00
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EXIT STATUS
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-----------
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2014-05-19 15:49:35 +00:00
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*btrfs-zero-log* will return 0 if no error happened.
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2014-04-02 08:29:35 +00:00
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Other exit code means some problems happened.
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AUTHOR
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------
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Written by Shilong Wang and Wenruo Qu.
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COPYRIGHT
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---------
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Copyright (C) 2013 FUJITSU LIMITED.
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License GPLv2: GNU GPL version 2 <http://gnu.org/licenses/gpl.html>.
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This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.
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SEE ALSO
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--------
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`mkfs.btrfs`(8)
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