Merge remote-tracking branch 'remotes/stefanha/tags/block-pull-request' into staging

[qemu.git] / migration / page_cache.c

diff --git a/migration/page_cache.c b/migration/page_cache.c
index ba984c48582bff3fb0591e97fba150bd84428a48..775582f453e968c352af3096b0ab0a7e50adfffa 100644 (file)
--- a/migration/page_cache.c
+++ b/migration/page_cache.c
@@ -14,9 +14,10 @@
 
 #include "qemu/osdep.h"
 
-#include "qemu-common.h"
+#include "qapi/qmp/qerror.h"
+#include "qapi/error.h"
 #include "qemu/host-utils.h"
-#include "migration/page_cache.h"
+#include "page_cache.h"
 
 #ifdef DEBUG_CACHE
 #define DPRINTF(fmt, ...) \
@@ -39,37 +40,39 @@ struct CacheItem {
 
 struct PageCache {
     CacheItem *page_cache;
-    unsigned int page_size;
-    int64_t max_num_items;
-    uint64_t max_item_age;
-    int64_t num_items;
+    size_t page_size;
+    size_t max_num_items;
+    size_t num_items;
 };
 
-PageCache *cache_init(int64_t num_pages, unsigned int page_size)
+PageCache *cache_init(int64_t new_size, size_t page_size, Error **errp)
 {
     int64_t i;
-
+    size_t num_pages = new_size / page_size;
     PageCache *cache;
 
-    if (num_pages <= 0) {
-        DPRINTF("invalid number of pages\n");
+    if (new_size < page_size) {
+        error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "cache size",
+                   "is smaller than one target page size");
+        return NULL;
+    }
+
+    /* round down to the nearest power of 2 */
+    if (!is_power_of_2(num_pages)) {
+        error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "cache size",
+                   "is not a power of two number of pages");
         return NULL;
     }
 
     /* We prefer not to abort if there is no memory */
     cache = g_try_malloc(sizeof(*cache));
     if (!cache) {
-        DPRINTF("Failed to allocate cache\n");
+        error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "cache size",
+                   "Failed to allocate cache");
         return NULL;
     }
-    /* round down to the nearest power of 2 */
-    if (!is_power_of_2(num_pages)) {
-        num_pages = pow2floor(num_pages);
-        DPRINTF("rounding down to %" PRId64 "\n", num_pages);
-    }
     cache->page_size = page_size;
     cache->num_items = 0;
-    cache->max_item_age = 0;
     cache->max_num_items = num_pages;
 
     DPRINTF("Setting cache buckets to %" PRId64 "\n", cache->max_num_items);
@@ -78,7 +81,8 @@ PageCache *cache_init(int64_t num_pages, unsigned int page_size)
     cache->page_cache = g_try_malloc((cache->max_num_items) *
                                      sizeof(*cache->page_cache));
     if (!cache->page_cache) {
-        DPRINTF("Failed to allocate cache->page_cache\n");
+        error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "cache size",
+                   "Failed to allocate page cache");
         g_free(cache);
         return NULL;
     }