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migration: Make cache_init() take an error parameter

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Once there, take a total size instead of the size of the pages.  We
move the check that the new_size is bigger than one page from
xbzrle_cache_resize().

Signed-off-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>

--

Fix typo spotted by Peter Xu
This commit is contained in:
Juan Quintela 2017-10-06 22:30:45 +02:00
parent 8acabf69ea
commit 80f8dfde97
3 changed files with 19 additions and 23 deletions
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17
migration/page_cache.c
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@ -14,6 +14,8 @@
#include "qemu/osdep.h"
#include "qapi/qmp/qerror.h"
#include "qapi/error.h"
#include "qemu-common.h"
#include "qemu/host-utils.h"
#include "migration/page_cache.h"
@ -44,21 +46,23 @@ struct PageCache {
size_t num_items;
};
PageCache *cache_init(size_t num_pages, size_t 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;
}
/* 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 */
@ -76,7 +80,8 @@ PageCache *cache_init(size_t num_pages, size_t 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;
}