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block: Add "drained begin/end" for internal snapshot
authorFam Zheng <[email protected]>
Fri, 23 Oct 2015 03:08:13 +0000 (11:08 +0800)
committerKevin Wolf <[email protected]>
Fri, 23 Oct 2015 16:18:24 +0000 (18:18 +0200)
commit507306cc8ee7981894a96c380f42d80e2674cb04
tree4264578ec61e852db7f791229283f3f70d87885ftree | snapshot
parentff52bf36a3a6c63b7528fbe64e9ed9976b221e68commit | diff
block: Add "drained begin/end" for internal snapshot

This ensures the atomicity of the transaction by avoiding processing of
external requests such as those from ioeventfd.

state->bs is assigned right after bdrv_drained_begin. Because it was
used as the flag for deletion or not in abort, now we need a separate
flag - InternalSnapshotState.created.

Signed-off-by: Fam Zheng <[email protected]>
Signed-off-by: Kevin Wolf <[email protected]>
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