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btrfs-progs: docs: add figure 1 to btrfs quota doc

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The document of btrfs quota is missing figure 1.

I notice the body is copy of http://sensille.com/qgroups.pdf (which is
linked from https://btrfs.wiki.kernel.org/index.php/Quota_support), and
insert the figure.

Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Misono, Tomohiro 2017-08-24 19:45:55 +02:00 committed by David Sterba
parent 031ea0083a
commit 4daf0d52f8
1 changed files with 17 additions and 1 deletions
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18
Documentation/btrfs-quota.asciidoc
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@ -96,7 +96,23 @@ instead of '0/ID'. For all higher levels, the ID can be chosen freely.
Each qgroup can contain a set of lower level qgroups, thus creating a hierarchy
of qgroups. Figure 1 shows an example qgroup tree.
// TODO: insert Figure 1
+---+
|2/1|
+---+
/ \
+---+/ \+---+
|1/1| |1/2|
+---+ +---+
/ \ / \
+---+/ \+---+/ \+---+
qgroups |0/1| |0/2| |0/3|
+-+-+ +---+ +---+
| / \ / \
| / \ / \
| / \ / \
extents 1 2 3 4
Figure1: Sample qgroup hierarchy
At the bottom, some extents are depicted showing which qgroups reference which
extents. It is important to understand the notion of 'referenced' vs