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authorKevin Wolf <kwolf@redhat.com>2012-04-12 13:20:41 +0200
committerKevin Wolf <kwolf@redhat.com>2012-04-20 15:57:27 +0200
commit4fabffc11234d0587a213418574095e036110cd2 (patch)
tree2fdfd1e834a37627e59d3eeeccbf5f38bfdd1e36 /softmmu-semi.h
parentf24423bd902bce29bc546cf8d030bfa369726ab1 (diff)
Specification for qcow2 version 3
This updates the qcow2 specification to cover version 3. It contains the following changes: - Added compatible/incompatible/auto-clear feature bits plus an optional feature name table to allow useful error messages even if an older version doesn't know some feature at all. - Configurable refcount width. If you don't want to use internal snapshots, make refcounts one bit and save cache space and I/O. - Zero cluster flags. This allows discard even with a backing file that doesn't contain zeros. It is also useful for copy-on-read/image streaming, as you'll want to keep sparseness without accessing the remote image for an unallocated cluster all the time. - Fixed internal snapshot metadata to use 64 bit VM state size. You can't save a snapshot of a VM with >= 4 GB RAM today. - Extended internal snapshot metadata to contain the disk size, so that resizing images that have snapshots can be allowed in the future. Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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