2.3.9 FSCTL_DUPLICATE_EXTENTS_TO_FILE_EX Request

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The FSCTL_DUPLICATE_EXTENTS_TO_FILE_EX<21> request message requests that the server copy the specified portion of the source file into a specified portion of the target file on the same volume. The logical sizes of the portions MUST be the same. The two files involved in this operation can refer to the same file but the logical portions have to refer to disjoint regions on the file. The FSCTL is sent on a handle opened to the target file. When the DUPLICATE_EXTENTS_DATA_EX_SOURCE_ATOMIC flag isn’t set, the behavior is identical to FSCTL_DUPLICATE_EXTENTS_TO_FILE. When the flag is set, duplication is atomic from the source's point of view. It means duplication fully succeeds or fails without side effect (when only part of source file region is duplicated).

When used locally, the request message takes the form of DUPLICATE_EXTENTS_DATA_EX as specified in section 2.3.9.1. When used remotely with [MS-SMB2], the request message takes the form of SMB2_DUPLICATE_EXTENTS_DATA_EX as specified in section 2.3.9.2.