On Wed, Feb 27, 2019 at 06:22:39PM +0100, Kevin Wolf wrote: > - Bits 2-63: Reserved (set to 0) > + Bit 2: External data file bit. If this bit is set, > an > + external data file is used. Guest clusters > are > + then stored in the external data file. For > such > + images, clusters in the external data file > are > + not refcounted. The offset field in the > + Standard Cluster Descriptor must match the > + guest offset and neither compressed clusters > + nor internal snapshots are supported. > + > + An external data file name header extension > may > + be present if this bit is set.
This sentence is clearer if the header extension name is made prominent: An "external data file name" header extension Or An External Data File Name header extension (In the previous paragraph Standard Cluster Descriptor is also capitalized.) > @@ -148,6 +170,7 @@ be stored. Each extension has a structure like the > following: > 0x6803f857 - Feature name table > 0x23852875 - Bitmaps extension > 0x0537be77 - Full disk encryption header pointer > + 0x44415441 - External data file name This new header extension isn't described in this patch?
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