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btrfs-progs: Add explain on btrfs-zero-log. 

Add more explain on btrfs-zero-log about when to use it.

Reviewed-by: Marc MERLIN <marc@merlins.org>
Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.cz>
This commit is contained in:
Qu Wenruo 2014-04-11 10:43:53 +08:00 committed by David Sterba
parent 5dbedcc3e0
commit dad1c8ba3a
1 changed files with 18 additions and 0 deletions
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18
Documentation/btrfs-zero-log.txt
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@ -17,6 +17,24 @@ allow you to mount the filesystem again.
The common case where this happens has been fixed a long time ago, The common case where this happens has been fixed a long time ago,
so it is unlikely that you will see this particular problem. 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 EXIT STATUS
----------- -----------
'btrfs-zero-log' will return 0 if no error happened. 'btrfs-zero-log' will return 0 if no error happened.