Public bug reported:
Unprivileged users can already toggle whether a subvolume will be ro or
rw. Not having this working with shiftfs regresses various use-cases.
Issues have already been seen by Stéphane Graber (Cced here).
To enable this with shiftfs we need to whitelist BTRFS_IOC_FS_INFO,
BTRFS_IOC_SUBVOL_GETFLAGS, BTRFS_IOC_SUBVOL_SETFLAGS.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1828227
Title:
shiftfs: allow changing ro/rw for subvolumes
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