Fam Zheng
14ead646fe
vmdk: add support for “zeroed‐grain” GTE
Introduced support for zeroed-grain GTE, as specified in Virtual Disk Format 5.0[1]. Recent VMware hosted platform products support a new “zeroed‐grain” grain table entry (GTE). The zeroed‐grain GTE returns all zeros on read. In other words, the zeroed‐grain GTE indicates that a grain in the child disk is zero‐filled but does not actually occupy space in storage. A sparse extent with zeroed‐grain GTE has the following in its header: * SparseExtentHeader.version = 2 * SparseExtentHeader.flags has bit 2 set Other than the new flag and the possibly zeroed‐grain GTE, version 2 sparse extents are identical to version 1. Also, a zeroed‐grain GTE has value 0x1 in the GT table. [1] Virtual Disk Format 5.0, http://www.vmware.com/support/developer/vddk/vmdk_50_technote.pdf?src=vmdk Signed-off-by: Fam Zheng <famz@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
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Read the documentation in qemu-doc.html or on http://wiki.qemu.org - QEMU team
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