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# Date Author Comment
6f321e93 05/18/2011 03:38 pm Stefan Hajnoczi

qed: Periodically flush and clear need check bit

One strategy to limit the startup delay of consistency check when
opening image files is to ensure that the file is marked dirty for as
little time as possible.

QED currently marks the image dirty when the first allocating write...
19dfc44a 04/27/2011 05:21 pm Stefan Hajnoczi

qed: Fix consistency check on 32-bit hosts

The qed_bytes_to_clusters() function is normally used with size_t
lengths. Consistency check used it with file size length and therefore
failed on 32-bit hosts when the image file is 4 GB or more.

Make qed_bytes_to_clusters() explicitly 64-bit and update consistency...
21df65b6 04/13/2011 01:06 pm Anthony Liguori

qed: Add support for zero clusters

Zero clusters are similar to unallocated clusters except instead of reading
their value from a backing file when one is available, the cluster is always
read as zero.

This implements read support only. At this stage, QED will never write a...
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...