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authorOlaf Hering <olaf@aepfle.de>2014-05-07 13:40:04 +0000
committerStefano Stabellini <stefano.stabellini@eu.citrix.com>2014-05-07 16:18:04 +0000
commitf31352041bdde436c3f6d07e1525a42e48dec215 (patch)
tree6290479b8a2f3a5b9e360f4e1f9b09a53dd32d26 /include
parent8b6bb0ad17ab776239ba2bfc99ff107ada01c506 (diff)
xen_disk: add discard support
Implement discard support for xen_disk. It makes use of the existing discard code in qemu. The discard support is enabled unconditionally. The tool stack may provide a property "discard-enable" in the backend node to optionally disable discard support. This is helpful in case the backing file was intentionally created non-sparse to avoid fragmentation. Signed-off-by: Olaf Hering <olaf@aepfle.de> Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Diffstat (limited to 'include')
-rw-r--r--include/hw/xen/xen_common.h7
1 files changed, 7 insertions, 0 deletions
diff --git a/include/hw/xen/xen_common.h b/include/hw/xen/xen_common.h
index 2d5a25bf40..07731b9289 100644
--- a/include/hw/xen/xen_common.h
+++ b/include/hw/xen/xen_common.h
@@ -144,6 +144,13 @@ static inline int xen_xc_hvm_inject_msi(XenXC xen_xc, domid_t dom,
{
return -ENOSYS;
}
+/* The followings are only to compile op_discard related code on older
+ * Xen releases. */
+#define BLKIF_OP_DISCARD 5
+struct blkif_request_discard {
+ uint64_t nr_sectors;
+ uint64_t sector_number;
+};
#else
static inline int xen_xc_hvm_inject_msi(XenXC xen_xc, domid_t dom,
uint64_t addr, uint32_t data)