btrfs: allow cross-subvolume BTRFS_IOC_CLONE
Quoted 10 lines · Arne Jansen
Quoted 6 lines · Larry D'Anna
Quoted 2 lines
This is a simple patch to allow reflinks to be made crossing subvolume boundaries.
NAK. subvolumes will have to become vfsmounts sooner or later, and we really must not support any operations spanning mountpoints.
In what way would this interfere? the reflinked file gets its own inum in its own mountpoint. The two files only internally share some disk space.
Similarly, it would be pity if proposed deduplication couldn't cross subvolume boundaries...
Signature · 2 lines
Tomasz Chmielewski http://wpkg.org