bbedead5fc
For punching holes via fallocate. This will be useful for the external backup provider API to discard parts of the source. The 'file-handle' mechanism there uses a fuse mount, which does not implement the BLKDISCARD ioctl, but does implement fallocate. Signed-off-by: Fiona Ebner <f.ebner@proxmox.com> Tested-by: Wolfgang Bumiller <w.bumiller@proxmox.com> Reviewed-by: Wolfgang Bumiller <w.bumiller@proxmox.com> Link: https://lore.proxmox.com/20250404133204.239783-4-f.ebner@proxmox.com