#include "qemu/cutils.h"
#include "block/block_int.h"
-#include "block/qcow2.h"
+#include "qcow2.h"
/* NOTICE: BME here means Bitmaps Extension and used as a namespace for
* _internal_ constants. Please do not use this _internal_ abbreviation for
uint32_t size; /* number of 64bit entries */
QSIMPLEQ_ENTRY(Qcow2BitmapTable) entry;
} Qcow2BitmapTable;
-typedef QSIMPLEQ_HEAD(Qcow2BitmapTableList, Qcow2BitmapTable)
- Qcow2BitmapTableList;
typedef struct Qcow2Bitmap {
Qcow2BitmapTable table;
size_t i;
for (i = 0; i < size; ++i) {
- cpu_to_be64s(&bitmap_table[i]);
+ bitmap_table[i] = cpu_to_be64(bitmap_table[i]);
}
}
}
for (i = 0; i < tb->size; ++i) {
- be64_to_cpus(&table[i]);
+ table[i] = be64_to_cpu(table[i]);
ret = check_table_entry(table[i], s->cluster_size);
if (ret < 0) {
goto fail;
ret = bitmap_table_load(bs, tb, &bitmap_table);
if (ret < 0) {
- assert(bitmap_table == NULL);
return ret;
}
static inline void bitmap_dir_entry_to_cpu(Qcow2BitmapDirEntry *entry)
{
- be64_to_cpus(&entry->bitmap_table_offset);
- be32_to_cpus(&entry->bitmap_table_size);
- be32_to_cpus(&entry->flags);
- be16_to_cpus(&entry->name_size);
- be32_to_cpus(&entry->extra_data_size);
+ entry->bitmap_table_offset = be64_to_cpu(entry->bitmap_table_offset);
+ entry->bitmap_table_size = be32_to_cpu(entry->bitmap_table_size);
+ entry->flags = be32_to_cpu(entry->flags);
+ entry->name_size = be16_to_cpu(entry->name_size);
+ entry->extra_data_size = be32_to_cpu(entry->extra_data_size);
}
static inline void bitmap_dir_entry_to_be(Qcow2BitmapDirEntry *entry)
{
- cpu_to_be64s(&entry->bitmap_table_offset);
- cpu_to_be32s(&entry->bitmap_table_size);
- cpu_to_be32s(&entry->flags);
- cpu_to_be16s(&entry->name_size);
- cpu_to_be32s(&entry->extra_data_size);
+ entry->bitmap_table_offset = cpu_to_be64(entry->bitmap_table_offset);
+ entry->bitmap_table_size = cpu_to_be32(entry->bitmap_table_size);
+ entry->flags = cpu_to_be32(entry->flags);
+ entry->name_size = cpu_to_be16(entry->name_size);
+ entry->extra_data_size = cpu_to_be32(entry->extra_data_size);
}
static inline int calc_dir_entry_size(size_t name_size, size_t extra_data_size)
}
}
- ret = qcow2_pre_write_overlap_check(bs, 0, dir_offset, dir_size);
+ /* Actually, even in in-place case ignoring QCOW2_OL_BITMAP_DIRECTORY is not
+ * necessary, because we drop QCOW2_AUTOCLEAR_BITMAPS when updating bitmap
+ * directory in-place (actually, turn-off the extension), which is checked
+ * in qcow2_check_metadata_overlap() */
+ ret = qcow2_pre_write_overlap_check(
+ bs, in_place ? QCOW2_OL_BITMAP_DIRECTORY : 0, dir_offset, dir_size,
+ false);
if (ret < 0) {
goto fail;
}
return false;
}
-int qcow2_reopen_bitmaps_rw(BlockDriverState *bs, Error **errp)
+
+static Qcow2BitmapInfoFlagsList *get_bitmap_info_flags(uint32_t flags)
+{
+ Qcow2BitmapInfoFlagsList *list = NULL;
+ Qcow2BitmapInfoFlagsList **plist = &list;
+ int i;
+
+ static const struct {
+ int bme; /* Bitmap directory entry flags */
+ int info; /* The flags to report to the user */
+ } map[] = {
+ { BME_FLAG_IN_USE, QCOW2_BITMAP_INFO_FLAGS_IN_USE },
+ { BME_FLAG_AUTO, QCOW2_BITMAP_INFO_FLAGS_AUTO },
+ };
+
+ int map_size = ARRAY_SIZE(map);
+
+ for (i = 0; i < map_size; ++i) {
+ if (flags & map[i].bme) {
+ Qcow2BitmapInfoFlagsList *entry =
+ g_new0(Qcow2BitmapInfoFlagsList, 1);
+ entry->value = map[i].info;
+ *plist = entry;
+ plist = &entry->next;
+ flags &= ~map[i].bme;
+ }
+ }
+ /* Check if the BME_* mapping above is complete */
+ assert(!flags);
+
+ return list;
+}
+
+/*
+ * qcow2_get_bitmap_info_list()
+ * Returns a list of QCOW2 bitmap details.
+ * In case of no bitmaps, the function returns NULL and
+ * the @errp parameter is not set.
+ * When bitmap information can not be obtained, the function returns
+ * NULL and the @errp parameter is set.
+ */
+Qcow2BitmapInfoList *qcow2_get_bitmap_info_list(BlockDriverState *bs,
+ Error **errp)
+{
+ BDRVQcow2State *s = bs->opaque;
+ Qcow2BitmapList *bm_list;
+ Qcow2Bitmap *bm;
+ Qcow2BitmapInfoList *list = NULL;
+ Qcow2BitmapInfoList **plist = &list;
+
+ if (s->nb_bitmaps == 0) {
+ return NULL;
+ }
+
+ bm_list = bitmap_list_load(bs, s->bitmap_directory_offset,
+ s->bitmap_directory_size, errp);
+ if (bm_list == NULL) {
+ return NULL;
+ }
+
+ QSIMPLEQ_FOREACH(bm, bm_list, entry) {
+ Qcow2BitmapInfo *info = g_new0(Qcow2BitmapInfo, 1);
+ Qcow2BitmapInfoList *obj = g_new0(Qcow2BitmapInfoList, 1);
+ info->granularity = 1U << bm->granularity_bits;
+ info->name = g_strdup(bm->name);
+ info->flags = get_bitmap_info_flags(bm->flags & ~BME_RESERVED_FLAGS);
+ obj->value = info;
+ *plist = obj;
+ plist = &obj->next;
+ }
+
+ bitmap_list_free(bm_list);
+
+ return list;
+}
+
+int qcow2_reopen_bitmaps_rw_hint(BlockDriverState *bs, bool *header_updated,
+ Error **errp)
{
BDRVQcow2State *s = bs->opaque;
Qcow2BitmapList *bm_list;
GSList *ro_dirty_bitmaps = NULL;
int ret = 0;
+ if (header_updated != NULL) {
+ *header_updated = false;
+ }
+
if (s->nb_bitmaps == 0) {
/* No bitmaps - nothing to do */
return 0;
error_setg_errno(errp, -ret, "Can't update bitmap directory");
goto out;
}
+ if (header_updated != NULL) {
+ *header_updated = true;
+ }
g_slist_foreach(ro_dirty_bitmaps, set_readonly_helper, false);
}
return ret;
}
+int qcow2_reopen_bitmaps_rw(BlockDriverState *bs, Error **errp)
+{
+ return qcow2_reopen_bitmaps_rw_hint(bs, NULL, errp);
+}
+
/* store_bitmap_data()
* Store bitmap to image, filling bitmap table accordingly.
*/
memset(buf + write_size, 0, s->cluster_size - write_size);
}
- ret = qcow2_pre_write_overlap_check(bs, 0, off, s->cluster_size);
+ ret = qcow2_pre_write_overlap_check(bs, 0, off, s->cluster_size, false);
if (ret < 0) {
error_setg_errno(errp, -ret, "Qcow2 overlap check failed");
goto fail;
}
ret = qcow2_pre_write_overlap_check(bs, 0, tb_offset,
- tb_size * sizeof(tb[0]));
+ tb_size * sizeof(tb[0]), false);
if (ret < 0) {
error_setg_errno(errp, -ret, "Qcow2 overlap check failed");
goto fail;
int ret;
Qcow2BitmapList *bm_list;
Qcow2Bitmap *bm;
- Qcow2BitmapTableList drop_tables;
+ QSIMPLEQ_HEAD(, Qcow2BitmapTable) drop_tables;
Qcow2BitmapTable *tb, *tb_next;
if (!bdrv_has_changed_persistent_bitmaps(bs)) {
g_free(tb);
}
+ QSIMPLEQ_FOREACH(bm, bm_list, entry) {
+ /* For safety, we remove bitmap after storing.
+ * We may be here in two cases:
+ * 1. bdrv_close. It's ok to drop bitmap.
+ * 2. inactivation. It means migration without 'dirty-bitmaps'
+ * capability, so bitmaps are not marked with
+ * BdrvDirtyBitmap.migration flags. It's not bad to drop them too,
+ * and reload on invalidation.
+ */
+ if (bm->dirty_bitmap == NULL) {
+ continue;
+ }
+
+ bdrv_release_dirty_bitmap(bs, bm->dirty_bitmap);
+ }
+
bitmap_list_free(bm_list);
return;
projects / qemu.git / blobdiff