"Darrick J. Wong" <darrick.wong@xxxxxxxxxx> writes: > (Not sure about cifs, since I don't have a Windows Server handy) > > I'm not an expert in CIFS or NFS, so I'm asking: do either support > dedupe or is this a kernel bug? AFAIK, the SMB protocol has 2 ioctl to do server side copies: - FSCTL_SRV_COPYCHUNK [1] generic - FSCTL_DUPLICATE_EXTENTS_TO_FILE [2], only supported on windows "new" CoW filesystem ReFS Cheers, 1:https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-smb2/cd0162e4-7650-4293-8a2a-d696923203ef 2:https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-smb2/4f08d2f8-bd17-4181-9cec-54c4f6a1b439 -- Aurélien Aptel / SUSE Labs Samba Team GPG: 1839 CB5F 9F5B FB9B AA97 8C99 03C8 A49B 521B D5D3 SUSE Linux GmbH, Maxfeldstraße 5, 90409 Nürnberg, Germany GF: Felix Imendörffer, Mary Higgins, Sri Rasiah HRB 21284 (AG Nürnberg)
