On 2015-11-11 09:53, Eric Biggers wrote:
This could be important for BTRFS (because of subvolumes, you can have multiple mounts that have the same SB, and as of right now, it can be hard to tell the difference between a nested subvolume and a separate mount point). We do support cross-subvolume reflinks, but I'm not sure if that works between subvolumes mounted at different places (if it doesn't, I may have to look into getting that changed).On Tue, Nov 10, 2015 at 04:53:30PM -0500, Anna Schumaker wrote:/* this could be relaxed once a method supports cross-fs copies */ if (inode_in->i_sb != inode_out->i_sb) return -EXDEV;This allows the same superblock but different mounts --- is that intentional? The commit message says otherwise: it says the vfs entry point requires the same superblock and mount.
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