예제 #1
0
static void print_root(struct extent_buffer *leaf, int slot)
{
	struct btrfs_root_item *ri;
	struct btrfs_root_item root_item;
	int len;
	char uuid_str[128];

	ri = btrfs_item_ptr(leaf, slot, struct btrfs_root_item);
	len = btrfs_item_size_nr(leaf, slot);

	memset(&root_item, 0, sizeof(root_item));
	read_extent_buffer(leaf, &root_item, (unsigned long)ri, len);

	printf("\t\troot data bytenr %llu level %d dirid %llu refs %u gen %llu\n",
		(unsigned long long)btrfs_root_bytenr(&root_item),
		btrfs_root_level(&root_item),
		(unsigned long long)btrfs_root_dirid(&root_item),
		btrfs_root_refs(&root_item),
		(unsigned long long)btrfs_root_generation(&root_item));

	if (root_item.generation == root_item.generation_v2) {
		uuid_unparse(root_item.uuid, uuid_str);
		printf("\t\tuuid %s\n", uuid_str);
		if (count_bytes(root_item.parent_uuid, BTRFS_UUID_SIZE, 0) != BTRFS_UUID_SIZE) {
			uuid_unparse(root_item.parent_uuid, uuid_str);
			printf("\t\tparent_uuid %s\n", uuid_str);
		}
		if (count_bytes(root_item.received_uuid, BTRFS_UUID_SIZE, 0) != BTRFS_UUID_SIZE) {
			uuid_unparse(root_item.received_uuid, uuid_str);
			printf("\t\treceived_uuid %s\n", uuid_str);
		}
		if (root_item.ctransid) {
			printf("\t\tctransid %llu otransid %llu stransid %llu rtransid %llu\n",
				btrfs_root_ctransid(&root_item),
				btrfs_root_otransid(&root_item),
				btrfs_root_stransid(&root_item),
				btrfs_root_rtransid(&root_item));
		}
	}
	if (btrfs_root_refs(&root_item) == 0) {
		struct btrfs_key drop_key;
		btrfs_disk_key_to_cpu(&drop_key,
				      &root_item.drop_progress);
		printf("\t\tdrop ");
		btrfs_print_key(&root_item.drop_progress);
		printf(" level %d\n", root_item.drop_level);
	}
}
예제 #2
0
static void print_root(struct extent_buffer *leaf, int slot)
{
	struct btrfs_root_item *ri;
	struct btrfs_root_item root_item;
	int len;
	char uuid_str[BTRFS_UUID_UNPARSED_SIZE];
	char flags_str[32] = {0};
	struct btrfs_key drop_key;

	ri = btrfs_item_ptr(leaf, slot, struct btrfs_root_item);
	len = btrfs_item_size_nr(leaf, slot);

	memset(&root_item, 0, sizeof(root_item));
	read_extent_buffer(leaf, &root_item, (unsigned long)ri, len);
	root_flags_to_str(btrfs_root_flags(&root_item), flags_str);

	printf("\t\tgeneration %llu root_dirid %llu bytenr %llu level %hhu refs %u\n",
		(unsigned long long)btrfs_root_generation(&root_item),
		(unsigned long long)btrfs_root_dirid(&root_item),
		(unsigned long long)btrfs_root_bytenr(&root_item),
		btrfs_root_level(&root_item),
		btrfs_root_refs(&root_item));
	printf("\t\tlastsnap %llu byte_limit %llu bytes_used %llu flags 0x%llx(%s)\n",
		(unsigned long long)btrfs_root_last_snapshot(&root_item),
		(unsigned long long)btrfs_root_limit(&root_item),
		(unsigned long long)btrfs_root_used(&root_item),
		(unsigned long long)btrfs_root_flags(&root_item),
		flags_str);

	if (root_item.generation == root_item.generation_v2) {
		uuid_unparse(root_item.uuid, uuid_str);
		printf("\t\tuuid %s\n", uuid_str);
		if (!empty_uuid(root_item.parent_uuid)) {
			uuid_unparse(root_item.parent_uuid, uuid_str);
			printf("\t\tparent_uuid %s\n", uuid_str);
		}
		if (!empty_uuid(root_item.received_uuid)) {
			uuid_unparse(root_item.received_uuid, uuid_str);
			printf("\t\treceived_uuid %s\n", uuid_str);
		}
		if (root_item.ctransid) {
			printf("\t\tctransid %llu otransid %llu stransid %llu rtransid %llu\n",
				btrfs_root_ctransid(&root_item),
				btrfs_root_otransid(&root_item),
				btrfs_root_stransid(&root_item),
				btrfs_root_rtransid(&root_item));
		}
	}

	btrfs_disk_key_to_cpu(&drop_key, &root_item.drop_progress);
	printf("\t\tdrop ");
	btrfs_print_key(&root_item.drop_progress);
	printf(" level %hhu\n", root_item.drop_level);
}
예제 #3
0
static struct dentry *btrfs_get_dentry(struct super_block *sb, u64 objectid,
				       u64 root_objectid, u32 generation,
				       int check_generation)
{
	struct btrfs_fs_info *fs_info = btrfs_sb(sb);
	struct btrfs_root *root;
	struct inode *inode;
	struct btrfs_key key;
	int index;
	int err = 0;

	if (objectid < BTRFS_FIRST_FREE_OBJECTID)
		return ERR_PTR(-ESTALE);

	key.objectid = root_objectid;
	btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
	key.offset = (u64)-1;

	index = srcu_read_lock(&fs_info->subvol_srcu);

	root = btrfs_read_fs_root_no_name(fs_info, &key);
	if (IS_ERR(root)) {
		err = PTR_ERR(root);
		goto fail;
	}

	if (btrfs_root_refs(&root->root_item) == 0) {
		err = -ENOENT;
		goto fail;
	}

	key.objectid = objectid;
	btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY);
	key.offset = 0;

	inode = btrfs_iget(sb, &key, root, NULL);
	if (IS_ERR(inode)) {
		err = PTR_ERR(inode);
		goto fail;
	}

	srcu_read_unlock(&fs_info->subvol_srcu, index);

	if (check_generation && generation != inode->i_generation) {
		iput(inode);
		return ERR_PTR(-ESTALE);
	}

	return d_obtain_alias(inode);
fail:
	srcu_read_unlock(&fs_info->subvol_srcu, index);
	return ERR_PTR(err);
}
예제 #4
0
파일: ioctl.c 프로젝트: mikebyrne/linux-2.6
/*
 * Create a new subvolume below @parent.  This is largely modeled after
 * sys_mkdirat and vfs_mkdir, but we only do a single component lookup
 * inside this filesystem so it's quite a bit simpler.
 */
static noinline int btrfs_mksubvol(struct path *parent,
				   char *name, int namelen,
				   struct btrfs_root *snap_src)
{
	struct inode *dir  = parent->dentry->d_inode;
	struct dentry *dentry;
	int error;

	mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);

	dentry = lookup_one_len(name, parent->dentry, namelen);
	error = PTR_ERR(dentry);
	if (IS_ERR(dentry))
		goto out_unlock;

	error = -EEXIST;
	if (dentry->d_inode)
		goto out_dput;

	error = mnt_want_write(parent->mnt);
	if (error)
		goto out_dput;

	error = btrfs_may_create(dir, dentry);
	if (error)
		goto out_drop_write;

	down_read(&BTRFS_I(dir)->root->fs_info->subvol_sem);

	if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0)
		goto out_up_read;

	if (snap_src) {
		error = create_snapshot(snap_src, dentry,
					name, namelen);
	} else {
		error = create_subvol(BTRFS_I(dir)->root, dentry,
				      name, namelen);
	}
	if (!error)
		fsnotify_mkdir(dir, dentry);
out_up_read:
	up_read(&BTRFS_I(dir)->root->fs_info->subvol_sem);
out_drop_write:
	mnt_drop_write(parent->mnt);
out_dput:
	dput(dentry);
out_unlock:
	mutex_unlock(&dir->i_mutex);
	return error;
}
예제 #5
0
/*
 * at transaction commit time we need to schedule the old roots for
 * deletion via btrfs_drop_snapshot.  This runs through all the
 * reference counted roots that were modified in the current
 * transaction and puts them into the drop list
 */
static noinline int add_dirty_roots(struct btrfs_trans_handle *trans,
                                    struct radix_tree_root *radix,
                                    struct list_head *list)
{
    struct btrfs_dirty_root *dirty;
    struct btrfs_root *gang[8];
    struct btrfs_root *root;
    int i;
    int ret;
    int err = 0;
    u32 refs;

    while (1) {
        ret = radix_tree_gang_lookup_tag(radix, (void **)gang, 0,
                                         ARRAY_SIZE(gang),
                                         BTRFS_ROOT_TRANS_TAG);
        if (ret == 0)
            break;
        for (i = 0; i < ret; i++) {
            root = gang[i];
            radix_tree_tag_clear(radix,
                                 (unsigned long)root->root_key.objectid,
                                 BTRFS_ROOT_TRANS_TAG);

            BUG_ON(!root->ref_tree);
            dirty = root->dirty_root;

            btrfs_free_log(trans, root);
            btrfs_free_reloc_root(trans, root);

            if (root->commit_root == root->node) {
                WARN_ON(root->node->start !=
                        btrfs_root_bytenr(&root->root_item));

                free_extent_buffer(root->commit_root);
                root->commit_root = NULL;
                root->dirty_root = NULL;

                spin_lock(&root->list_lock);
                list_del_init(&dirty->root->dead_list);
                spin_unlock(&root->list_lock);

                kfree(dirty->root);
                kfree(dirty);

                /* make sure to update the root on disk
                 * so we get any updates to the block used
                 * counts
                 */
                err = btrfs_update_root(trans,
                                        root->fs_info->tree_root,
                                        &root->root_key,
                                        &root->root_item);
                continue;
            }

            memset(&root->root_item.drop_progress, 0,
                   sizeof(struct btrfs_disk_key));
            root->root_item.drop_level = 0;
            root->commit_root = NULL;
            root->dirty_root = NULL;
            root->root_key.offset = root->fs_info->generation;
            btrfs_set_root_bytenr(&root->root_item,
                                  root->node->start);
            btrfs_set_root_level(&root->root_item,
                                 btrfs_header_level(root->node));
            btrfs_set_root_generation(&root->root_item,
                                      root->root_key.offset);

            err = btrfs_insert_root(trans, root->fs_info->tree_root,
                                    &root->root_key,
                                    &root->root_item);
            if (err)
                break;

            refs = btrfs_root_refs(&dirty->root->root_item);
            btrfs_set_root_refs(&dirty->root->root_item, refs - 1);
            err = btrfs_update_root(trans, root->fs_info->tree_root,
                                    &dirty->root->root_key,
                                    &dirty->root->root_item);

            BUG_ON(err);
            if (refs == 1) {
                list_add(&dirty->list, list);
            } else {
                WARN_ON(1);
                free_extent_buffer(dirty->root->node);
                kfree(dirty->root);
                kfree(dirty);
            }
        }
    }
    return err;
}
예제 #6
0
void btrfs_print_leaf(struct btrfs_root *root, struct btrfs_leaf *l)
{
	unsigned int i;
	u32 nr = btrfs_header_nritems(&l->header);
	struct btrfs_item *item;
	struct btrfs_extent_item *ei;
	struct btrfs_root_item *ri;
	struct btrfs_dir_item *di;
	struct btrfs_inode_item *ii;
	struct btrfs_file_extent_item *fi;
	struct btrfs_csum_item *ci;
	struct btrfs_block_group_item *bi;
	u32 type;

	printf("leaf %llu ptrs %d free space %d generation %llu owner %llu\n",
		(u64)btrfs_header_blocknr(&l->header), nr,
		btrfs_leaf_free_space(root, l),
		(u64)btrfs_header_generation(&l->header),
		(u64)btrfs_header_owner(&l->header));
	fflush(stdout);
	for (i = 0 ; i < nr ; i++) {
		item = l->items + i;
		type = btrfs_disk_key_type(&item->key);
		printf("\titem %d key (%llu %x %llu) itemoff %d itemsize %d\n",
			i,
			(u64)btrfs_disk_key_objectid(&item->key),
			btrfs_disk_key_flags(&item->key),
			(u64)btrfs_disk_key_offset(&item->key),
			btrfs_item_offset(item),
			btrfs_item_size(item));
		switch (type) {
		case BTRFS_INODE_ITEM_KEY:
			ii = btrfs_item_ptr(l, i, struct btrfs_inode_item);
			printf("\t\tinode generation %llu size %llu block group %llu mode %o\n",
			       (u64)btrfs_inode_generation(ii),
			       (u64)btrfs_inode_size(ii),
			       (u64)btrfs_inode_block_group(ii),
			       btrfs_inode_mode(ii));
			break;
		case BTRFS_DIR_ITEM_KEY:
			di = btrfs_item_ptr(l, i, struct btrfs_dir_item);
			print_dir_item(l->items + i, di);
			break;
		case BTRFS_DIR_INDEX_KEY:
			di = btrfs_item_ptr(l, i, struct btrfs_dir_item);
			print_dir_item(l->items + i, di);
			break;
		case BTRFS_ROOT_ITEM_KEY:
			ri = btrfs_item_ptr(l, i, struct btrfs_root_item);
			printf("\t\troot data blocknr %llu dirid %llu refs %u\n",
				(u64)btrfs_root_blocknr(ri),
				(u64)btrfs_root_dirid(ri),
				btrfs_root_refs(ri));
			break;
		case BTRFS_EXTENT_ITEM_KEY:
			ei = btrfs_item_ptr(l, i, struct btrfs_extent_item);
			printf("\t\textent data refs %u owner %llu\n",
				btrfs_extent_refs(ei),
				(u64)btrfs_extent_owner(ei));
			break;
		case BTRFS_CSUM_ITEM_KEY:
			ci = btrfs_item_ptr(l, i,
					    struct btrfs_csum_item);
			printf("\t\tcsum item\n");
			break;
		case BTRFS_EXTENT_DATA_KEY:
			fi = btrfs_item_ptr(l, i,
					    struct btrfs_file_extent_item);
			if (btrfs_file_extent_type(fi) ==
			    BTRFS_FILE_EXTENT_INLINE) {
				printf("\t\tinline extent data size %u\n",
			           btrfs_file_extent_inline_len(l->items + i));
				break;
			}
			printf("\t\textent data disk block %llu nr %llu\n",
			       (u64)btrfs_file_extent_disk_blocknr(fi),
			       (u64)btrfs_file_extent_disk_num_blocks(fi));
			printf("\t\textent data offset %llu nr %llu\n",
			  (u64)btrfs_file_extent_offset(fi),
			  (u64)btrfs_file_extent_num_blocks(fi));
			break;
		case BTRFS_BLOCK_GROUP_ITEM_KEY:
			bi = btrfs_item_ptr(l, i,
					    struct btrfs_block_group_item);
			printf("\t\tblock group used %llu flags %x\n",
			       (u64)btrfs_block_group_used(bi),
			       bi->flags);
			break;
		case BTRFS_STRING_ITEM_KEY:
			printf("\t\titem data %.*s\n", btrfs_item_size(item),
				btrfs_leaf_data(l) + btrfs_item_offset(item));
			break;
		};
		fflush(stdout);
	}
}
예제 #7
0
void btrfs_print_leaf(struct btrfs_root *root, struct extent_buffer *l)
{
	int i;
	char *str;
	struct btrfs_item *item;
	struct btrfs_root_item *ri;
	struct btrfs_dir_item *di;
	struct btrfs_inode_item *ii;
	struct btrfs_file_extent_item *fi;
	struct btrfs_block_group_item *bi;
	struct btrfs_extent_data_ref *dref;
	struct btrfs_shared_data_ref *sref;
	struct btrfs_inode_ref *iref;
	struct btrfs_dev_extent *dev_extent;
	struct btrfs_disk_key disk_key;
	struct btrfs_root_item root_item;
	struct btrfs_block_group_item bg_item;
	struct btrfs_dir_log_item *dlog;
	u32 nr = btrfs_header_nritems(l);
	u32 type;

	printf("leaf %llu items %d free space %d generation %llu owner %llu\n",
		(unsigned long long)btrfs_header_bytenr(l), nr,
		btrfs_leaf_free_space(root, l),
		(unsigned long long)btrfs_header_generation(l),
		(unsigned long long)btrfs_header_owner(l));
	print_uuids(l);
	fflush(stdout);
	for (i = 0 ; i < nr ; i++) {
		item = btrfs_item_nr(l, i);
		btrfs_item_key(l, &disk_key, i);
		type = btrfs_disk_key_type(&disk_key);
		printf("\titem %d ", i);
		btrfs_print_key(&disk_key);
		printf(" itemoff %d itemsize %d\n",
			btrfs_item_offset(l, item),
			btrfs_item_size(l, item));
		switch (type) {
		case BTRFS_INODE_ITEM_KEY:
			ii = btrfs_item_ptr(l, i, struct btrfs_inode_item);
			printf("\t\tinode generation %llu size %llu block group %llu mode %o links %u\n",
			       (unsigned long long)btrfs_inode_generation(l, ii),
			       (unsigned long long)btrfs_inode_size(l, ii),
			       (unsigned long long)btrfs_inode_block_group(l,ii),
			       btrfs_inode_mode(l, ii),
			       btrfs_inode_nlink(l, ii));
			break;
		case BTRFS_INODE_REF_KEY:
			iref = btrfs_item_ptr(l, i, struct btrfs_inode_ref);
			print_inode_ref_item(l, item, iref);
			break;
		case BTRFS_DIR_ITEM_KEY:
		case BTRFS_DIR_INDEX_KEY:
		case BTRFS_XATTR_ITEM_KEY:
			di = btrfs_item_ptr(l, i, struct btrfs_dir_item);
			print_dir_item(l, item, di);
			break;
		case BTRFS_DIR_LOG_INDEX_KEY:
		case BTRFS_DIR_LOG_ITEM_KEY:
			dlog = btrfs_item_ptr(l, i, struct btrfs_dir_log_item);
			printf("\t\tdir log end %Lu\n",
			       (unsigned long long)btrfs_dir_log_end(l, dlog));
		       break;
		case BTRFS_ORPHAN_ITEM_KEY:
			printf("\t\torphan item\n");
			break;
		case BTRFS_ROOT_ITEM_KEY:
			ri = btrfs_item_ptr(l, i, struct btrfs_root_item);
			read_extent_buffer(l, &root_item, (unsigned long)ri, sizeof(root_item));
			printf("\t\troot data bytenr %llu level %d dirid %llu refs %u gen %llu\n",
				(unsigned long long)btrfs_root_bytenr(&root_item),
				btrfs_root_level(&root_item),
				(unsigned long long)btrfs_root_dirid(&root_item),
				btrfs_root_refs(&root_item),
				(unsigned long long)btrfs_root_generation(&root_item));
			if (btrfs_root_refs(&root_item) == 0) {
				struct btrfs_key drop_key;
				btrfs_disk_key_to_cpu(&drop_key,
						      &root_item.drop_progress);
				printf("\t\tdrop ");
				btrfs_print_key(&root_item.drop_progress);
				printf(" level %d\n", root_item.drop_level);
			}
			break;
		case BTRFS_ROOT_REF_KEY:
			print_root_ref(l, i, "ref");
			break;
		case BTRFS_ROOT_BACKREF_KEY:
			print_root_ref(l, i, "backref");
			break;
		case BTRFS_EXTENT_ITEM_KEY:
			print_extent_item(l, i);
			break;
		case BTRFS_TREE_BLOCK_REF_KEY:
			printf("\t\ttree block backref\n");
			break;
		case BTRFS_SHARED_BLOCK_REF_KEY:
			printf("\t\tshared block backref\n");
			break;
		case BTRFS_EXTENT_DATA_REF_KEY:
			dref = btrfs_item_ptr(l, i, struct btrfs_extent_data_ref);
			printf("\t\textent data backref root %llu "
			       "objectid %llu offset %llu count %u\n",
			       (unsigned long long)btrfs_extent_data_ref_root(l, dref),
			       (unsigned long long)btrfs_extent_data_ref_objectid(l, dref),
			       (unsigned long long)btrfs_extent_data_ref_offset(l, dref),
			       btrfs_extent_data_ref_count(l, dref));
			break;
		case BTRFS_SHARED_DATA_REF_KEY:
			sref = btrfs_item_ptr(l, i, struct btrfs_shared_data_ref);
			printf("\t\tshared data backref count %u\n",
			       btrfs_shared_data_ref_count(l, sref));
			break;
		case BTRFS_EXTENT_REF_V0_KEY:
#ifdef BTRFS_COMPAT_EXTENT_TREE_V0
			print_extent_ref_v0(l, i);
#else
			BUG();
#endif
			break;
		case BTRFS_CSUM_ITEM_KEY:
			printf("\t\tcsum item\n");
			break;
		case BTRFS_EXTENT_CSUM_KEY:
			printf("\t\textent csum item\n");
			break;
		case BTRFS_EXTENT_DATA_KEY:
			fi = btrfs_item_ptr(l, i,
					    struct btrfs_file_extent_item);
			print_file_extent_item(l, item, fi);
			break;
		case BTRFS_BLOCK_GROUP_ITEM_KEY:
			bi = btrfs_item_ptr(l, i,
					    struct btrfs_block_group_item);
			read_extent_buffer(l, &bg_item, (unsigned long)bi,
					   sizeof(bg_item));
			printf("\t\tblock group used %llu chunk_objectid %llu flags %llu\n",
			       (unsigned long long)btrfs_block_group_used(&bg_item),
			       (unsigned long long)btrfs_block_group_chunk_objectid(&bg_item),
			       (unsigned long long)btrfs_block_group_flags(&bg_item));
			break;
		case BTRFS_CHUNK_ITEM_KEY:
			print_chunk(l, btrfs_item_ptr(l, i, struct btrfs_chunk));
			break;
		case BTRFS_DEV_ITEM_KEY:
			print_dev_item(l, btrfs_item_ptr(l, i,
					struct btrfs_dev_item));
			break;
		case BTRFS_DEV_EXTENT_KEY:
			dev_extent = btrfs_item_ptr(l, i,
						    struct btrfs_dev_extent);
			printf("\t\tdev extent chunk_tree %llu\n"
			       "\t\tchunk objectid %llu chunk offset %llu "
			       "length %llu\n",
			       (unsigned long long)
			       btrfs_dev_extent_chunk_tree(l, dev_extent),
			       (unsigned long long)
			       btrfs_dev_extent_chunk_objectid(l, dev_extent),
			       (unsigned long long)
			       btrfs_dev_extent_chunk_offset(l, dev_extent),
			       (unsigned long long)
			       btrfs_dev_extent_length(l, dev_extent));
			break;
		case BTRFS_STRING_ITEM_KEY:
			/* dirty, but it's simple */
			str = l->data + btrfs_item_ptr_offset(l, i);
			printf("\t\titem data %.*s\n", btrfs_item_size(l, item), str);
			break;
		};
		fflush(stdout);
	}
}