btrfs-progs: allow "no" to disable compression for convenience

[platform/upstream/btrfs-progs.git] / Documentation / btrfs-subvolume.asciidoc

diff --git a/Documentation/btrfs-subvolume.asciidoc b/Documentation/btrfs-subvolume.asciidoc
index 3419b13..d33fee5 100644 (file)
--- a/Documentation/btrfs-subvolume.asciidoc
+++ b/Documentation/btrfs-subvolume.asciidoc
@@ -66,10 +66,13 @@ If <subvolume> is not a subvolume, btrfs returns an error but continues if
 there are more arguments to process.
 +
 The corresponding directory is removed instantly but the data blocks are
-removed later.  The deletion does not involve full commit by default due to
-performance reasons (as a consequence, the subvolume may appear again after a
-crash).  Use one of the '--commit' options to wait until the operation is safely
-stored on the media.
+removed later in the background. The command returns immediatelly. See `btrfs
+subvolume sync` how to wait until the subvolume gets completely removed.
++
+The deletion does not involve full transaction commit by default due to
+performance reasons.  As a consequence, the subvolume may appear again after a
+crash.  Use one of the '--commit' options to wait until the operation is
+safely stored on the device.
 +
 `Options`
 +
@@ -139,12 +142,13 @@ you can add \'\+' or \'-' in front of each items, \'+' means ascending,
 for --sort you can combine some items together by \',', just like
 --sort=+ogen,-gen,path,rootid.
 
-*set-default* <id> <path>::
-Set the subvolume of the filesystem <path> which is mounted as
-default.
+*set-default* [<subvolume>|<id> <path>]::
+Set the default subvolume of the (mounted) filesystem.
 +
-The subvolume is identified by <id>, which is returned by the *subvolume list*
-command.
+There are two ways how to specify the subvolume, by <id> or by the <subvolume>
+path.
+The id can be obtained from *btrfs subvolume list*, *btrfs subvolume show* or
+*btrfs inspect-internal rootid*.
 
 *show* <path>::
 Show information of a given subvolume in the <path>.