[Bug 8918] New: Use fiemap to quickly detect zero ranges of source file

samba-bugs at samba.org samba-bugs at samba.org
Mon May 7 22:17:04 MDT 2012


           Summary: Use fiemap to quickly detect zero ranges of source
           Product: rsync
           Version: 3.1.0
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P5
         Component: core
        AssignedTo: wayned at samba.org
        ReportedBy: matt at mattmccutchen.net
         QAContact: rsync-qa at samba.org

Rsync could use the fiemap ioctl
on the source file to detect any ranges that do not have data on the filesystem
and thus are guaranteed to read as zero, without actually reading them.  This
would be most useful in combination with writing the destination file sparsely
(--sparse), but it would be safe to use in any case as a sender-side

Originally proposed at https://bugzilla.redhat.com/show_bug.cgi?id=525545.

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