map->stripe_len = btrfs_chunk_stripe_len(leaf, chunk);
map->type = btrfs_chunk_type(leaf, chunk);
map->sub_stripes = btrfs_chunk_sub_stripes(leaf, chunk);
+ map->verified_stripes = 0;
for (i = 0; i < num_stripes; i++) {
map->stripes[i].physical =
btrfs_stripe_offset_nr(leaf, chunk, i);
return 2;
return 1;
}
+
+
+static u64 calc_stripe_length(u64 type, u64 chunk_len, int num_stripes)
+{
+ int index = btrfs_bg_flags_to_raid_index(type);
+ int ncopies = btrfs_raid_array[index].ncopies;
+ int data_stripes;
+
+ switch (type & BTRFS_BLOCK_GROUP_PROFILE_MASK) {
+ case BTRFS_BLOCK_GROUP_RAID5:
+ data_stripes = num_stripes - 1;
+ break;
+ case BTRFS_BLOCK_GROUP_RAID6:
+ data_stripes = num_stripes - 2;
+ break;
+ default:
+ data_stripes = num_stripes / ncopies;
+ break;
+ }
+ return div_u64(chunk_len, data_stripes);
+}
+
+static int verify_one_dev_extent(struct btrfs_fs_info *fs_info,
+ u64 chunk_offset, u64 devid,
+ u64 physical_offset, u64 physical_len)
+{
+ struct extent_map_tree *em_tree = &fs_info->mapping_tree.map_tree;
+ struct extent_map *em;
+ struct map_lookup *map;
+ u64 stripe_len;
+ bool found = false;
+ int ret = 0;
+ int i;
+
+ read_lock(&em_tree->lock);
+ em = lookup_extent_mapping(em_tree, chunk_offset, 1);
+ read_unlock(&em_tree->lock);
+
+ if (!em) {
+ btrfs_err(fs_info,
+"dev extent physical offset %llu on devid %llu doesn't have corresponding chunk",
+ physical_offset, devid);
+ ret = -EUCLEAN;
+ goto out;
+ }
+
+ map = em->map_lookup;
+ stripe_len = calc_stripe_length(map->type, em->len, map->num_stripes);
+ if (physical_len != stripe_len) {
+ btrfs_err(fs_info,
+"dev extent physical offset %llu on devid %llu length doesn't match chunk %llu, have %llu expect %llu",
+ physical_offset, devid, em->start, physical_len,
+ stripe_len);
+ ret = -EUCLEAN;
+ goto out;
+ }
+
+ for (i = 0; i < map->num_stripes; i++) {
+ if (map->stripes[i].dev->devid == devid &&
+ map->stripes[i].physical == physical_offset) {
+ found = true;
+ if (map->verified_stripes >= map->num_stripes) {
+ btrfs_err(fs_info,
+ "too many dev extents for chunk %llu found",
+ em->start);
+ ret = -EUCLEAN;
+ goto out;
+ }
+ map->verified_stripes++;
+ break;
+ }
+ }
+ if (!found) {
+ btrfs_err(fs_info,
+ "dev extent physical offset %llu devid %llu has no corresponding chunk",
+ physical_offset, devid);
+ ret = -EUCLEAN;
+ }
+out:
+ free_extent_map(em);
+ return ret;
+}
+
+static int verify_chunk_dev_extent_mapping(struct btrfs_fs_info *fs_info)
+{
+ struct extent_map_tree *em_tree = &fs_info->mapping_tree.map_tree;
+ struct extent_map *em;
+ struct rb_node *node;
+ int ret = 0;
+
+ read_lock(&em_tree->lock);
+ for (node = rb_first(&em_tree->map); node; node = rb_next(node)) {
+ em = rb_entry(node, struct extent_map, rb_node);
+ if (em->map_lookup->num_stripes !=
+ em->map_lookup->verified_stripes) {
+ btrfs_err(fs_info,
+ "chunk %llu has missing dev extent, have %d expect %d",
+ em->start, em->map_lookup->verified_stripes,
+ em->map_lookup->num_stripes);
+ ret = -EUCLEAN;
+ goto out;
+ }
+ }
+out:
+ read_unlock(&em_tree->lock);
+ return ret;
+}
+
+/*
+ * Ensure that all dev extents are mapped to correct chunk, otherwise
+ * later chunk allocation/free would cause unexpected behavior.
+ *
+ * NOTE: This will iterate through the whole device tree, which should be of
+ * the same size level as the chunk tree. This slightly increases mount time.
+ */
+int btrfs_verify_dev_extents(struct btrfs_fs_info *fs_info)
+{
+ struct btrfs_path *path;
+ struct btrfs_root *root = fs_info->dev_root;
+ struct btrfs_key key;
+ int ret = 0;
+
+ key.objectid = 1;
+ key.type = BTRFS_DEV_EXTENT_KEY;
+ key.offset = 0;
+
+ path = btrfs_alloc_path();
+ if (!path)
+ return -ENOMEM;
+
+ path->reada = READA_FORWARD;
+ ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
+ if (ret < 0)
+ goto out;
+
+ if (path->slots[0] >= btrfs_header_nritems(path->nodes[0])) {
+ ret = btrfs_next_item(root, path);
+ if (ret < 0)
+ goto out;
+ /* No dev extents at all? Not good */
+ if (ret > 0) {
+ ret = -EUCLEAN;
+ goto out;
+ }
+ }
+ while (1) {
+ struct extent_buffer *leaf = path->nodes[0];
+ struct btrfs_dev_extent *dext;
+ int slot = path->slots[0];
+ u64 chunk_offset;
+ u64 physical_offset;
+ u64 physical_len;
+ u64 devid;
+
+ btrfs_item_key_to_cpu(leaf, &key, slot);
+ if (key.type != BTRFS_DEV_EXTENT_KEY)
+ break;
+ devid = key.objectid;
+ physical_offset = key.offset;
+
+ dext = btrfs_item_ptr(leaf, slot, struct btrfs_dev_extent);
+ chunk_offset = btrfs_dev_extent_chunk_offset(leaf, dext);
+ physical_len = btrfs_dev_extent_length(leaf, dext);
+
+ ret = verify_one_dev_extent(fs_info, chunk_offset, devid,
+ physical_offset, physical_len);
+ if (ret < 0)
+ goto out;
+ ret = btrfs_next_item(root, path);
+ if (ret < 0)
+ goto out;
+ if (ret > 0) {
+ ret = 0;
+ break;
+ }
+ }
+
+ /* Ensure all chunks have corresponding dev extents */
+ ret = verify_chunk_dev_extent_mapping(fs_info);
+out:
+ btrfs_free_path(path);
+ return ret;
+}
git.samba.org / sfrench / cifs-2.6.git / blobdiff