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btrfs-progs: docs: add metadata_uuid description to sect. 5 

Signed-off-by: David Sterba <dsterba@suse.com>
master
David Sterba 2019-01-15 17:19:16 +01:00
parent a36d331f03
commit 428bb2e9c2
1 changed files with 7 additions and 0 deletions
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7
Documentation/btrfs-man5.asciidoc
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@ -587,6 +587,13 @@ increased hardlink limit per file in a directory to 65536, older kernels
supported a varying number of hardlinks depending on the sum of all file name
sizes that can be stored into one metadata block
*metadata_uuid*::
(since: 5.0)
+
the main filesystem UUID is the metadata_uuid, which stores the new UUID only
in the superblock while all metadata blocks still have the UUID set at mkfs
time, see `btrfstune`(8) for more
*mixed_backref*::
(since: 2.6.31)
+