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btrfs: Add datacow mount option.

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Add datacow mount option to enable copy-on-write with
remount option.

Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Reviewed-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: Chris Mason <clm@fb.com>
This commit is contained in:
Qu Wenruo
2014-01-06 09:58:31 +08:00
committed by Chris Mason
parent bd0330ad21
commit a258af7a3e
2 changed files with 10 additions and 3 deletions
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5
Documentation/filesystems/btrfs.txt
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@@ -154,9 +154,10 @@ Options with (*) are default options and will not show in the mount options.
(non-battery-backed) write-back cache, nobarrier option will lead to
filesystem corruption on a system crash or power loss.
datacow(*)
nodatacow
Disable data copy-on-write for newly created files. Implies nodatasum,
and disables all compression.
Enable/disable data copy-on-write for newly created files.
Nodatacow implies nodatasum, and disables all compression.
nodatasum
Disable data checksumming for newly created files.