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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 <[email protected]>
Reviewed-by: David Sterba <[email protected]>
Signed-off-by: Josef Bacik <[email protected]>
Signed-off-by: Chris Mason <[email protected]>
This commit is contained in:
Qu Wenruo 2014-01-06 09:58:31 +08:00 • committed by Chris Mason
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.