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809b553940
This allows to rewrite content of specified file(s) as-is without modifications, but at a different location, compression, checksum, dedup, copies and other parameter values. It is faster than read plus write, since it does not require data copying to user-space. It is also faster for sync=always datasets, since without data modification it does not require ZIL writing. Also since it is protected by normal range range locks, it can be done under any other load. Also it does not affect file's modification time or other properties. Signed-off-by: Alexander Motin <mav@FreeBSD.org> Sponsored by: iXsystems, Inc. Reviewed-by: Tony Hutter <hutter2@llnl.gov> Reviewed-by: Rob Norris <robn@despairlabs.com> |
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