Akihiro Suda 62b5194f62 btrfs: Allow unprivileged user to delete subvolumes (kernel >= 4.18) ... Fix issue 41762 Cherry-pick "drivers: btrfs: Allow unprivileged user to delete subvolumes" from containers/storage 831e32b6bd > In btrfs, subvolume can be deleted by IOC_SNAP_DESTROY ioctl but there > is one catch: unprivileged IOC_SNAP_DESTROY call is restricted by default. > > This is because IOC_SNAP_DESTROY only performs permission checks on > the top directory(subvolume) and unprivileged user might delete dirs/files > which cannot be deleted otherwise. This restriction can be relaxed if > user_subvol_rm_allowed mount option is used. > > Although the above ioctl had been the only way to delete a subvolume, > btrfs now allows deletion of subvolume just like regular directory > (i.e. rmdir sycall) since kernel 4.18. > > So if we fail to cleanup subvolume in subvolDelete(), just fallback to > system.EnsureRmoveall() to try to cleanup subvolumes again. > (Note: quota needs privilege, so if quota is enabled we do not fallback) > > This fix will allow non-privileged container works with btrfs backend. Signed-off-by: Akihiro Suda <akihiro.suda.cz@hco.ntt.co.jp>		2021-03-26 14:30:40 +09:00
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btrfs.go	btrfs: Allow unprivileged user to delete subvolumes (kernel >= 4.18)	2021-03-26 14:30:40 +09:00
btrfs_test.go	Add canonical import comment	2018-02-05 16:51:57 -05:00
dummy_unsupported.go	Add canonical import comment	2018-02-05 16:51:57 -05:00
version.go	daemon: Remove btrfs_noversion build flag	2019-08-06 22:55:29 +00:00
version_test.go	daemon: Remove btrfs_noversion build flag	2019-08-06 22:55:29 +00:00