[PATCH 1/5] libxc: xc_domain_restore, make toolstack_restore const-correct

[Ian Jackson <ian.jackson@eu.citrix.com>]

Also provide typedefs for the nontrivial function callback types.

Update the one provider of this callback, in libxl.

Signed-off-by: Ian Jackson <ian.jackson@eu.citrix.com>
---
 tools/libxc/xenguest.h  |   14 ++++++++++----
 tools/libxl/libxl_dom.c |    4 ++--
 2 files changed, 12 insertions(+), 6 deletions(-)

diff --git a/tools/libxc/xenguest.h b/tools/libxc/xenguest.h
index 6435f65..ddf9a0b 100644
--- a/tools/libxc/xenguest.h
+++ b/tools/libxc/xenguest.h
@@ -31,6 +31,10 @@
 #define X86_64_B_SIZE   64 
 #define X86_32_B_SIZE   32
 
+typedef int xc_switch_qemu_logdirty_cb(int domid, unsigned enable, void *data);
+typedef int xc_toolstack_save_cb(uint32_t domid, uint8_t **buf,
+                                 uint32_t *len, void *data);
+
 /* callbacks provided by xc_domain_save */
 struct save_callbacks {
     int (*suspend)(void* data);
@@ -42,7 +46,7 @@ struct save_callbacks {
     int (*checkpoint)(void* data);
 
     /* Enable qemu-dm logging dirty pages to xen */
-    int (*switch_qemu_logdirty)(int domid, unsigned enable, void *data); /* HVM only */
+    xc_switch_qemu_logdirty_cb *switch_qemu_logdirty; /* HVM only */
 
     /* Save toolstack specific data
      * @param buf the buffer with the data to be saved
@@ -50,7 +54,7 @@ struct save_callbacks {
      * The callee allocates the buffer, the caller frees it (buffer must
      * be free'able).
      */
-    int (*toolstack_save)(uint32_t domid, uint8_t **buf, uint32_t *len, void *data);
+    xc_toolstack_save_cb *toolstack_save;
 
     /* to be provided as the last argument to each callback function */
     void* data;
@@ -70,11 +74,13 @@ int xc_domain_save(xc_interface *xch, int io_fd, uint32_t dom, uint32_t max_iter
                    unsigned long vm_generationid_addr);
 
 
+typedef int xc_toolstack_restore_cb(uint32_t domid, const uint8_t *buf,
+                                    uint32_t size, void* data);
+
 /* callbacks provided by xc_domain_restore */
 struct restore_callbacks {
     /* callback to restore toolstack specific data */
-    int (*toolstack_restore)(uint32_t domid, uint8_t *buf,
-            uint32_t size, void* data);
+    xc_toolstack_restore_cb *toolstack_restore;
 
     /* to be provided as the last argument to each callback function */
     void* data;
diff --git a/tools/libxl/libxl_dom.c b/tools/libxl/libxl_dom.c
index 6064d44..01d5595 100644
--- a/tools/libxl/libxl_dom.c
+++ b/tools/libxl/libxl_dom.c
@@ -461,13 +461,13 @@ static inline char *restore_helper(libxl__gc *gc, uint32_t domid,
             domid, phys_offset, node);
 }
 
-static int libxl__toolstack_restore(uint32_t domid, uint8_t *buf,
+static int libxl__toolstack_restore(uint32_t domid, const uint8_t *buf,
         uint32_t size, void *data)
 {
     libxl__gc *gc = (libxl__gc *) data;
     libxl_ctx *ctx = gc->owner;
     int i, ret;
-    uint8_t *ptr = buf;
+    const uint8_t *ptr = buf;
     uint32_t count = 0, version = 0;
     struct libxl__physmap_info* pi;
     char *xs_path;
-- 
1.7.2.5