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...C_SNAP_SGETFLAGS....) ) > >- It seems to me there''s no user requirement for getflags ioctl to >return _RDONLY/_WRITABLE flags of a tree root? And how an user/admin can understand that a snapshot/subvolume is readonly ? How > >- By suggesting BTRFS_SUBVOL_RDONLY, does it impliy not only snapshot >but also a subvolume can be made readonly? IIRC a snapshot is a subvolume already filled from the beginning. Why doesn''t share the capability of make a subvolume RO ? Finally I have another suggestion: make sense to check that the file descriptor is referring to...