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btrfs-progs: docs: add note about mount option applicability

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Copied from https://btrfs.wiki.kernel.org/index.php/Mount_options .

Signed-off-by: David Sterba <dsterba@suse.com>
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David Sterba 2017-11-07 19:17:41 +01:00
parent c9fa9355f3
commit a0abb06218
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Documentation/btrfs-man5.asciidoc
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@ -26,6 +26,13 @@ This section describes mount options specific to BTRFS. For the generic mount
options please refer to `mount`(8) manpage. The options are sorted alphabetically
(discarding the 'no' prefix).
NOTE: most mount options apply to the whole filesystem and only options in the
first mounted subvolume will take effect. This is due to lack of implementation
and may change in the future. This means that (for example) you can't set
per-subvolume 'nodatacow', 'nodatasum', or 'compress' using mount options. This
should eventually be fixed, but it has proved to be difficult to implement
correctly within the Linux VFS framework.
*acl*::
*noacl*::
(default: on)