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authorStefan Hajnoczi <stefanha@linux.vnet.ibm.com>2011-11-17 13:40:27 +0000
committerKevin Wolf <kwolf@redhat.com>2011-12-05 14:51:38 +0100
commitdbffbdcfff69431b622866ac5ea78df74fdc02d4 (patch)
treeec4b73f7c58efde89080cf37588ed9ce56fe3b55 /qemu-img-cmds.hx
parente8ee5e4c476d5b0654d8f1271a2b7c065acc486e (diff)
block: add request tracking
The block layer does not know about pending requests. This information is necessary for copy-on-read since overlapping requests must be serialized to prevent races that corrupt the image. The BlockDriverState gets a new tracked_request list field which contains all pending requests. Each request is a BdrvTrackedRequest record with sector_num, nb_sectors, and is_write fields. Note that request tracking is always enabled but hopefully this extra work is so small that it doesn't justify adding an enable/disable flag. Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Diffstat (limited to 'qemu-img-cmds.hx')
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