Btrfs-progs: add fsck test for filesystem with shared prealloc extents

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

diff --git a/Documentation/mkfs.btrfs.asciidoc b/Documentation/mkfs.btrfs.asciidoc
index 153bb87..2a1c359 100644 (file)
--- a/Documentation/mkfs.btrfs.asciidoc
+++ b/Documentation/mkfs.btrfs.asciidoc
@@ -100,18 +100,21 @@ Please see the mount option 'discard' for that in `btrfs`(5).
 
 *-r|--rootdir <rootdir>*::
 Populate the toplevel subvolume with files from 'rootdir'.  This does not
-require root permissions and does not mount the filesystem.
+require root permissions to write the new files or to mount the filesystem.
 +
-NOTE: This option may enlarge the image or file to ensure it's large enough to
-contain the files from 'rootdir'.
+NOTE: This option may enlarge the image or file to ensure it's big enough to
+contain the files from 'rootdir'. Since version 4.14.1 the filesystem size is
+not minimized. Please see option '--shrink' if you need that functionality.
 
-*--shrink*:
-Shrink the filesystem to its minimal size, only works with *-r|--rootdir*
-option.
+*--shrink*::
+Shrink the filesystem to its minimal size, only works with '--rootdir' option.
 +
-NOTE: If the destination is regular file, this option will also reduce the
-file size. Or it will only reduce the filesystem available space.
-Extra space will not be usable unless resized using 'btrfs filesystem resize'.
+If the destination is a regular file, this option will also truncate the
+file to the minimal size. Otherwise it will reduce the filesystem available
+space.  Extra space will not be usable unless the filesystem is mounted and
+resized using 'btrfs filesystem resize'.
++
+NOTE: prior to version 4.14.1, the shrinking was done automatically.
 
 *-O|--features <feature1>[,<feature2>...]*::
 A list of filesystem features turned on at mkfs time. Not all features are