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btrfs-progs: docs: compression is disabled with nodatasum/nodatacow 

Explicitly mention the constraints in all involved options.

Signed-off-by: David Sterba <dsterba@suse.com>
master
David Sterba 2016-05-17 16:13:44 +02:00
parent f34d10bbe9
commit 16570509f6
1 changed files with 4 additions and 0 deletions
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Documentation/btrfs-man5.asciidoc
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@ -139,6 +139,8 @@ NOTE: If compression is enabled, 'nodatacow' and 'nodatasum' are disabled.
Enable data copy-on-write for newly created files.
'Nodatacow' implies 'nodatasum', and disables 'compression'. All files created
under 'nodatacow' are also set the NOCOW file attribute (see `chattr`(1)).
+
NOTE: If 'nodatacow' or 'nodatasum' are enabled, compression is disabled.
*datasum*::
*nodatasum*::
@ -148,6 +150,8 @@ Enable data checksumming for newly created files.
'Datasum' implies 'datacow', ie. the normal mode of operation. All files created
under 'nodatasum' inherit the "no checksums" property, however there's no
corresponding file attribute (see `chattr`(1)).
+
NOTE: If 'nodatacow' or 'nodatasum' are enabled, compression is disabled.
*degraded*::
(default: off)