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# Date Author Comment
75411d23 12/17/2010 05:11 pm Stefan Hajnoczi

qed: Add QEMU Enhanced Disk image format

This patch introduces the qed on-disk layout and implements image
creation. Later patches add read/write and other functionality.

Signed-off-by: Stefan Hajnoczi <>
Signed-off-by: Kevin Wolf <>
298800ca 12/17/2010 05:11 pm Stefan Hajnoczi

qed: Table, L2 cache, and cluster functions

This patch adds code to look up data cluster offsets in the image via
the L1/L2 tables. The L2 tables are writethrough cached in memory for
performance (each read/write requires a lookup so it is essential to
cache the tables)....
eabba580 12/17/2010 05:11 pm Stefan Hajnoczi

qed: Read/write support

This patch implements the read/write state machine. Operations are
fully asynchronous and multiple operations may be active at any time.

Allocating writes lock tables to ensure metadata updates do not
interfere with each other. If two allocating writes need to update the...
01979a98 12/17/2010 05:11 pm Stefan Hajnoczi

qed: Consistency check support

This patch adds support for the qemu-img check command. It also
introduces a dirty bit in the qed header to mark modified images as
needing a check. This bit is cleared when the image file is closed
cleanly.

If an image file is opened and it has the dirty bit set, a consistency...