On Mon, Nov 07, 2022 at 06:45:38PM -0600, Steve French wrote:
I noticed that reflink (FSCTL_DUPLICATE_EXTENTS) is not supported on Samba when run over XFS but is with the vfs_btrfs. I can do reflink locally on the XFS mount point, but not remotely unless it is BTRFS (or to Windows eg. when the share is on REFS). Any idea if there is a way to enable reflink (FSCTL_DUPLICATE_EXTENT) support for Samba when not running on btrfs (e.g. on xfs)? duplicate extents is needed for various Linux client features (especially various fallocate operations)
This is implemented in vfs_btrfs.c via: ret = ioctl(fsp_get_io_fd(dest_fsp), BTRFS_IOC_CLONE_RANGE, &cr_args); what ioctls are used for this in XFS ? We'd need a VFS module that implements them for XFS.
