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authorkmacy <kmacy@FreeBSD.org>2008-09-26 05:29:39 +0000
committerkmacy <kmacy@FreeBSD.org>2008-09-26 05:29:39 +0000
commit3d2b6bb54b8a411bb970da8c076cad33f16eba7a (patch)
treec6c485e78e0fbd30ce865ac6ee34c847120931a3 /sys/xen/interface/io/blkif.h
parent966196697e0d67be61d85d4d9f9039a772c7cc2c (diff)
downloadFreeBSD-src-3d2b6bb54b8a411bb970da8c076cad33f16eba7a.zip
FreeBSD-src-3d2b6bb54b8a411bb970da8c076cad33f16eba7a.tar.gz
Update xen/interface includes to the latest in mercurial
MFC after: 1 month
Diffstat (limited to 'sys/xen/interface/io/blkif.h')
-rw-r--r--sys/xen/interface/io/blkif.h15
1 files changed, 14 insertions, 1 deletions
diff --git a/sys/xen/interface/io/blkif.h b/sys/xen/interface/io/blkif.h
index d2bd652..9e2d3d0 100644
--- a/sys/xen/interface/io/blkif.h
+++ b/sys/xen/interface/io/blkif.h
@@ -54,7 +54,7 @@
#define BLKIF_OP_WRITE 1
/*
* Recognised only if "feature-barrier" is present in backend xenbus info.
- * The "feature_barrier" node contains a boolean indicating whether barrier
+ * The "feature-barrier" node contains a boolean indicating whether barrier
* requests are likely to succeed or fail. Either way, a barrier request
* may fail at any time with BLKIF_RSP_EOPNOTSUPP if it is unsupported by
* the underlying block-device hardware. The boolean simply indicates whether
@@ -63,6 +63,19 @@
* create the "feature-barrier" node!
*/
#define BLKIF_OP_WRITE_BARRIER 2
+/*
+ * Recognised if "feature-flush-cache" is present in backend xenbus
+ * info. A flush will ask the underlying storage hardware to flush its
+ * non-volatile caches as appropriate. The "feature-flush-cache" node
+ * contains a boolean indicating whether flush requests are likely to
+ * succeed or fail. Either way, a flush request may fail at any time
+ * with BLKIF_RSP_EOPNOTSUPP if it is unsupported by the underlying
+ * block-device hardware. The boolean simply indicates whether or not it
+ * is worthwhile for the frontend to attempt flushes. If a backend does
+ * not recognise BLKIF_OP_WRITE_FLUSH_CACHE, it should *not* create the
+ * "feature-flush-cache" node!
+ */
+#define BLKIF_OP_FLUSH_DISKCACHE 3
/*
* Maximum scatter/gather segments per request.
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