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authorKevin Wolf <kwolf@redhat.com>2018-06-26 14:23:23 +0200
committerKevin Wolf <kwolf@redhat.com>2018-06-29 14:20:56 +0200
commit1bc5f09f2e1b2be8f6f737b8d5352b438fc41492 (patch)
tree17c58245a6ec4d176d565aecc71d9c005a349827 /include
parent3d9f2d2af63fda5f0404fb85ea80161837a4e4e3 (diff)
block: Use tracked request for truncate
When growing an image, block drivers (especially protocol drivers) may initialise the newly added area. I/O requests to the same area need to wait for this initialisation to be completed so that data writes don't get overwritten and reads don't read uninitialised data. To avoid overhead in the fast I/O path by adding new locking in the protocol drivers and to restrict the impact to requests that actually touch the new area, reuse the existing tracked request infrastructure in block/io.c and mark all discard requests as serialising. With this change, it is safe for protocol drivers to make .bdrv_co_truncate actually asynchronous. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Diffstat (limited to 'include')
-rw-r--r--include/block/block_int.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/block/block_int.h b/include/block/block_int.h
index 740166a996..af71b414be 100644
--- a/include/block/block_int.h
+++ b/include/block/block_int.h
@@ -63,6 +63,7 @@ enum BdrvTrackedRequestType {
BDRV_TRACKED_READ,
BDRV_TRACKED_WRITE,
BDRV_TRACKED_DISCARD,
+ BDRV_TRACKED_TRUNCATE,
};
typedef struct BdrvTrackedRequest {