[Bug 3798] New: Add native sparse file support (SEEK_HOLE, SEEK_DATA) to scp/sftp

[bugzilla-daemon at mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=3798

            Bug ID: 3798
           Summary: Add native sparse file support (SEEK_HOLE, SEEK_DATA)
                    to scp/sftp
           Product: Portable OpenSSH
           Version: 9.9p2
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P5
         Component: sftp-server
          Assignee: unassigned-bugs at mindrot.org
          Reporter: Lionelcons1972 at gmail.com

Please add NATIVE sparse file support in scp/sftp via
SEEK_DATA/SEEK_HOLE on
POSIX(https://pubs.opengroup.org/onlinepubs/9799919799/functions/lseek.html)
or Windows  FSCTL_QUERY_ALLOCATED_RANGES
(https://learn.microsoft.com/en-us/windows/win32/api/winioctl/ni-winioctl-fsctl_query_allocated_ranges).

We need that because people have tried to copy sparse file before, and
it either RUINED the files (by making them non-sparse, the holes were
filled-in with 0 byte data), or copies took forever because the holes
in sparse files are very large (e.g. multi TB size).

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