uint32_t size; /* number of 64bit entries */
QSIMPLEQ_ENTRY(Qcow2BitmapTable) entry;
} Qcow2BitmapTable;
-typedef QSIMPLEQ_HEAD(Qcow2BitmapTableList, Qcow2BitmapTable)
- Qcow2BitmapTableList;
typedef struct Qcow2Bitmap {
Qcow2BitmapTable table;
uint32_t granularity;
BdrvDirtyBitmap *bitmap = NULL;
- if (bm->flags & BME_FLAG_IN_USE) {
- error_setg(errp, "Bitmap '%s' is in use", bm->name);
+ granularity = 1U << bm->granularity_bits;
+ bitmap = bdrv_create_dirty_bitmap(bs, granularity, bm->name, errp);
+ if (bitmap == NULL) {
goto fail;
}
+ if (bm->flags & BME_FLAG_IN_USE) {
+ /* Data is unusable, skip loading it */
+ return bitmap;
+ }
+
ret = bitmap_table_load(bs, &bm->table, &bitmap_table);
if (ret < 0) {
error_setg_errno(errp, -ret,
goto fail;
}
- granularity = 1U << bm->granularity_bits;
- bitmap = bdrv_create_dirty_bitmap(bs, granularity, bm->name, errp);
- if (bitmap == NULL) {
- goto fail;
- }
-
ret = load_bitmap_data(bs, bitmap_table, bm->table.size, bitmap);
if (ret < 0) {
error_setg_errno(errp, -ret, "Could not read bitmap '%s' from image",
return len;
}
- fail = (phys_bitmap_bytes > BME_MAX_PHYS_SIZE) ||
- (len > ((phys_bitmap_bytes * 8) << entry->granularity_bits));
+ if (phys_bitmap_bytes > BME_MAX_PHYS_SIZE) {
+ return -EINVAL;
+ }
- return fail ? -EINVAL : 0;
+ if (!(entry->flags & BME_FLAG_IN_USE) &&
+ (len > ((phys_bitmap_bytes * 8) << entry->granularity_bits)))
+ {
+ /*
+ * We've loaded a valid bitmap (IN_USE not set) or we are going to
+ * store a valid bitmap, but the allocated bitmap table size is not
+ * enough to store this bitmap.
+ *
+ * Note, that it's OK to have an invalid bitmap with invalid size due
+ * to a bitmap that was not correctly saved after image resize.
+ */
+ return -EINVAL;
+ }
+
+ return 0;
}
static inline void bitmap_directory_to_be(uint8_t *dir, size_t size)
* 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);
+ bs, in_place ? QCOW2_OL_BITMAP_DIRECTORY : 0, dir_offset, dir_size,
+ false);
if (ret < 0) {
goto fail;
}
Qcow2Bitmap *bm;
GSList *created_dirty_bitmaps = NULL;
bool header_updated = false;
+ bool needs_update = false;
if (s->nb_bitmaps == 0) {
/* No bitmaps - nothing to do */
}
QSIMPLEQ_FOREACH(bm, bm_list, entry) {
- if (!(bm->flags & BME_FLAG_IN_USE)) {
- BdrvDirtyBitmap *bitmap = load_bitmap(bs, bm, errp);
- if (bitmap == NULL) {
- goto fail;
- }
+ BdrvDirtyBitmap *bitmap = load_bitmap(bs, bm, errp);
+ if (bitmap == NULL) {
+ goto fail;
+ }
- if (!(bm->flags & BME_FLAG_AUTO)) {
- bdrv_disable_dirty_bitmap(bitmap);
- }
- bdrv_dirty_bitmap_set_persistance(bitmap, true);
+ bdrv_dirty_bitmap_set_persistence(bitmap, true);
+ if (bm->flags & BME_FLAG_IN_USE) {
+ bdrv_dirty_bitmap_set_inconsistent(bitmap);
+ } else {
+ /* NB: updated flags only get written if can_write(bs) is true. */
bm->flags |= BME_FLAG_IN_USE;
- created_dirty_bitmaps =
- g_slist_append(created_dirty_bitmaps, bitmap);
+ needs_update = true;
+ }
+ if (!(bm->flags & BME_FLAG_AUTO)) {
+ bdrv_disable_dirty_bitmap(bitmap);
}
+ created_dirty_bitmaps =
+ g_slist_append(created_dirty_bitmaps, bitmap);
}
- if (created_dirty_bitmaps != NULL) {
- if (can_write(bs)) {
- /* in_use flags must be updated */
- int ret = update_ext_header_and_dir_in_place(bs, bm_list);
- if (ret < 0) {
- error_setg_errno(errp, -ret, "Can't update bitmap directory");
- goto fail;
- }
- header_updated = true;
- } else {
- g_slist_foreach(created_dirty_bitmaps, set_readonly_helper,
- (gpointer)true);
+ if (needs_update && can_write(bs)) {
+ /* in_use flags must be updated */
+ int ret = update_ext_header_and_dir_in_place(bs, bm_list);
+ if (ret < 0) {
+ error_setg_errno(errp, -ret, "Can't update bitmap directory");
+ goto fail;
}
+ header_updated = true;
+ }
+
+ if (!can_write(bs)) {
+ g_slist_foreach(created_dirty_bitmaps, set_readonly_helper,
+ (gpointer)true);
}
g_slist_free(created_dirty_bitmaps);
return false;
}
+
+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)
{
}
QSIMPLEQ_FOREACH(bm, bm_list, entry) {
- if (!(bm->flags & BME_FLAG_IN_USE)) {
- BdrvDirtyBitmap *bitmap = bdrv_find_dirty_bitmap(bs, bm->name);
- if (bitmap == NULL) {
- continue;
- }
-
- if (!bdrv_dirty_bitmap_readonly(bitmap)) {
- error_setg(errp, "Bitmap %s is not readonly but not marked"
- "'IN_USE' in the image. Something went wrong,"
- "all the bitmaps may be corrupted", bm->name);
- ret = -EINVAL;
- goto out;
- }
+ BdrvDirtyBitmap *bitmap = bdrv_find_dirty_bitmap(bs, bm->name);
+ if (bitmap == NULL) {
+ continue;
+ }
- bm->flags |= BME_FLAG_IN_USE;
- ro_dirty_bitmaps = g_slist_append(ro_dirty_bitmaps, bitmap);
+ if (!bdrv_dirty_bitmap_readonly(bitmap)) {
+ error_setg(errp, "Bitmap %s was loaded prior to rw-reopen, but was "
+ "not marked as readonly. This is a bug, something went "
+ "wrong. All of the bitmaps may be corrupted", bm->name);
+ ret = -EINVAL;
+ goto out;
}
+
+ bm->flags |= BME_FLAG_IN_USE;
+ ro_dirty_bitmaps = g_slist_append(ro_dirty_bitmaps, bitmap);
}
if (ro_dirty_bitmaps != NULL) {
return qcow2_reopen_bitmaps_rw_hint(bs, NULL, errp);
}
+/* Checks to see if it's safe to resize bitmaps */
+int qcow2_truncate_bitmaps_check(BlockDriverState *bs, Error **errp)
+{
+ BDRVQcow2State *s = bs->opaque;
+ Qcow2BitmapList *bm_list;
+ Qcow2Bitmap *bm;
+ int ret = 0;
+
+ if (s->nb_bitmaps == 0) {
+ return 0;
+ }
+
+ bm_list = bitmap_list_load(bs, s->bitmap_directory_offset,
+ s->bitmap_directory_size, errp);
+ if (bm_list == NULL) {
+ return -EINVAL;
+ }
+
+ QSIMPLEQ_FOREACH(bm, bm_list, entry) {
+ BdrvDirtyBitmap *bitmap = bdrv_find_dirty_bitmap(bs, bm->name);
+ if (bitmap == NULL) {
+ /*
+ * We rely on all bitmaps being in-memory to be able to resize them,
+ * Otherwise, we'd need to resize them on disk explicitly
+ */
+ error_setg(errp, "Cannot resize qcow2 with persistent bitmaps that "
+ "were not loaded into memory");
+ ret = -ENOTSUP;
+ goto out;
+ }
+
+ /*
+ * The checks against readonly and busy are redundant, but certainly
+ * do no harm. checks against inconsistent are crucial:
+ */
+ if (bdrv_dirty_bitmap_check(bitmap, BDRV_BITMAP_DEFAULT, errp)) {
+ ret = -ENOTSUP;
+ goto out;
+ }
+ }
+
+out:
+ bitmap_list_free(bm_list);
+ return ret;
+}
+
/* 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)) {
uint32_t granularity = bdrv_dirty_bitmap_granularity(bitmap);
Qcow2Bitmap *bm;
- if (!bdrv_dirty_bitmap_get_persistance(bitmap) ||
- bdrv_dirty_bitmap_readonly(bitmap))
- {
+ if (!bdrv_dirty_bitmap_get_persistence(bitmap) ||
+ bdrv_dirty_bitmap_readonly(bitmap) ||
+ bdrv_dirty_bitmap_inconsistent(bitmap)) {
continue;
}
for (bitmap = bdrv_dirty_bitmap_next(bs, NULL); bitmap != NULL;
bitmap = bdrv_dirty_bitmap_next(bs, bitmap))
{
- if (bdrv_dirty_bitmap_get_persistance(bitmap)) {
+ if (bdrv_dirty_bitmap_get_persistence(bitmap)) {
bdrv_dirty_bitmap_set_readonly(bitmap, true);
}
}
projects / qemu.git / blobdiff