https://bugzilla.samba.org/show_bug.cgi?id=8918
Summary: Use fiemap to quickly detect zero ranges of source
file
Product: rsync
Version: 3.1.0
Platform: All
OS/Version: All
Status: NEW
Severity: enhancement
Priority: P5
Component: core
AssignedTo: [email protected]
ReportedBy: [email protected]
QAContact: [email protected]
Rsync could use the fiemap ioctl
(https://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=blob;f=Documentation/filesystems/fiemap.txt;hb=HEAD)
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
optimization.
Originally proposed at https://bugzilla.redhat.com/show_bug.cgi?id=525545.
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