+WARNING: Before v4.14 btrfs-progs, *--rootdir* will shrink the filesystem, +prevent user to make use of the remaining space. +In v4.14 btrfs-progs, this behavior is changed, and will not shrink the fs. +The result should be the same as `mkfs`, `mount` and then `cp -r`. +
Hmm well. Shrink to fit exactly to the size of the given files-and-directory is indeed a nice feature. Which would help to create a golden-image btrfs seed device. Its not popular as of now, but at some point it may in the cloud environment.
Replacing this feature instead of creating a new option is not a good idea indeed. I missed something ?
Thanks, Anand
+Also, if destination file/block device does not exist, *--rootdir* will not +create the image file, to make it follow the normal mkfs behavior.
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