[Bug 1400] New: add atomic rename extension to sftp-server

[bugzilla-daemon at bugzilla.mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=1400

           Summary: add atomic rename extension to sftp-server
    Classification: Unclassified
           Product: Portable OpenSSH
           Version: -current
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: sftp-server
        AssignedTo: bitbucket at mindrot.org
        ReportedBy: miklos at szeredi.hu


This is needed to be able to support a rename() operation conforming
to POSIX in the SSH filesystem.

With the rename operation defined in the SFTP spec, this is
impossible, since in case the target exists it's not possible to
perform the rename+unlink atomically.

The patch applies on top of the statfs extension patch.

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