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btrfs-progs: docs: enhance manual page for btrfstune 

Signed-off-by: David Sterba <dsterba@suse.com>
master
David Sterba 2015-11-02 11:08:57 +01:00
parent a2d66e0962
commit b44e84a650
1 changed files with 11 additions and 8 deletions
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19
Documentation/btrfstune.asciidoc
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@ -26,11 +26,14 @@ Enable seeding on a given device. Value 1 will enable seeding, 0 will disable it
A seeding filesystem is forced to be mounted read-only. A new device can be added
to the filesystem and will capture all writes keeping the seeding device intact.
-r::
Enable extended inode refs (hardlink limit per file in a directory is 65536). Since kernel 3.7.
Enable extended inode refs (hardlink limit per file in a directory is 65536),
enabled by mkfs feature 'extref'. Since kernel 3.7.
-x::
Enable skinny metadata extent refs (more efficient representation of extents). Since kernel 3.10.
Enable skinny metadata extent refs (more efficient representation of extents),
enabled by mkfs feature 'skinny-metadata'. Since kernel 3.10.
-n::
Enable no-holes feature (more efficient representation of file holes). Since kernel 3.14.
Enable no-holes feature (more efficient representation of file holes), enabled
by mkfs feature 'no-holes'. Since kernel 3.14.
-f::
Allow dangerous changes, e.g. clear the seeding flag or change fsid. Make sure
that you are aware of the dangers.
@ -38,12 +41,12 @@ that you are aware of the dangers.
Change fsid to a randomly generated UUID or continue previous fsid change
operation in case it was interrupted.
-U <UUID>::
Change fsid to <UUID>.
Change fsid to 'UUID'.
+
The <UUID> should be a 36 bytes string in `printf`(3) format
"%08x-%04x-%04x-%04x-%012x".
The 'UUID' should be a 36 bytes string in `printf`(3) format
'"%08x-%04x-%04x-%04x-%012x"'.
If there is a previous unfinished fsid change, it will continue only if the
<UUID> matches the unfinished one or if you use the option '-u'.
'UUID' matches the unfinished one or if you use the option '-u'.
WARNING: Cancelling or interrupting a UUID change operation will make the
filesystem temporarily unmountable. To fix it, rerun 'btrfstune -u' to restore
@ -53,7 +56,7 @@ WARNING: Clearing the seeding flag on a device may be dangerous.
If a previously-seeding device is changed, all filesystems that used that
device will become unmountable. Setting the seeding flag back will not fix
that. +
A valid usecase is "seeding device as a base image". Clear the seeding
A valid usecase is 'seeding device as a base image'. Clear the seeding
flag, update the filesystem and make it seeding again, provided that it's ok
to throw away all filesystems built on top of the previous base.