Btrfs: add owner and type fields to the extents aand block headers

Signed-off-by: Chris Mason <chris.mason@oracle.com>

fs/btrfs/ctree.c

@@ -68,6 +68,7 @@ static int btrfs_cow_block(struct btrfs_trans_handle *trans, struct btrfs_root
 	memcpy(cow_node, btrfs_buffer_node(buf), root->blocksize);
 	btrfs_set_header_blocknr(&cow_node->header, bh_blocknr(cow));
 	btrfs_set_header_generation(&cow_node->header, trans->transid);
+	btrfs_set_header_owner(&cow_node->header, root->root_key.objectid);
 	btrfs_inc_ref(trans, root, buf);
 	if (buf == root->node) {
 		root->node = cow;
@@ -806,6 +807,7 @@ static int insert_new_root(struct btrfs_trans_handle *trans, struct btrfs_root
 	btrfs_set_header_level(&c->header, level);
 	btrfs_set_header_blocknr(&c->header, bh_blocknr(t));
 	btrfs_set_header_generation(&c->header, trans->transid);
+	btrfs_set_header_owner(&c->header, root->root_key.objectid);
 	lower = btrfs_buffer_node(path->nodes[level-1]);
 	memcpy(c->header.fsid, root->fs_info->disk_super->fsid,
 	       sizeof(c->header.fsid));
@@ -909,6 +911,7 @@ static int split_node(struct btrfs_trans_handle *trans, struct btrfs_root
 	btrfs_set_header_level(&split->header, btrfs_header_level(&c->header));
 	btrfs_set_header_blocknr(&split->header, bh_blocknr(split_buffer));
 	btrfs_set_header_generation(&split->header, trans->transid);
+	btrfs_set_header_owner(&split->header, root->root_key.objectid);
 	memcpy(split->header.fsid, root->fs_info->disk_super->fsid,
 	       sizeof(split->header.fsid));
 	mid = (c_nritems + 1) / 2;
@@ -1280,6 +1283,7 @@ static int split_leaf(struct btrfs_trans_handle *trans, struct btrfs_root
 	memset(&right->header, 0, sizeof(right->header));
 	btrfs_set_header_blocknr(&right->header, bh_blocknr(right_buffer));
 	btrfs_set_header_generation(&right->header, trans->transid);
+	btrfs_set_header_owner(&right->header, root->root_key.objectid);
 	btrfs_set_header_level(&right->header, 0);
 	memcpy(right->header.fsid, root->fs_info->disk_super->fsid,
 	       sizeof(right->header.fsid));
@@ -1376,6 +1380,7 @@ static int split_leaf(struct btrfs_trans_handle *trans, struct btrfs_root
 	memset(&right->header, 0, sizeof(right->header));
 	btrfs_set_header_blocknr(&right->header, bh_blocknr(right_buffer));
 	btrfs_set_header_generation(&right->header, trans->transid);
+	btrfs_set_header_owner(&right->header, root->root_key.objectid);
 	btrfs_set_header_level(&right->header, 0);
 	memcpy(right->header.fsid, root->fs_info->disk_super->fsid,
 	       sizeof(right->header.fsid));

fs/btrfs/ctree.h

@@ -62,6 +62,7 @@ struct btrfs_header {
 	u8 fsid[16]; /* FS specific uuid */
 	__le64 blocknr; /* which block this node is supposed to live in */
 	__le64 generation;
+	__le64 owner;
 	__le16 nritems;
 	__le16 flags;
 	u8 level;
@@ -151,12 +152,17 @@ struct btrfs_path {
 	int slots[BTRFS_MAX_LEVEL];
 };
 
+/* values for the type field in btrfs_extent_item */
+#define BTRFS_EXTENT_TREE 1
+#define BTRFS_EXTENT_FILE 2
 /*
  * items in the extent btree are used to record the objectid of the
  * owner of the block and the number of references
  */
 struct btrfs_extent_item {
 	__le32 refs;
+	__le64 owner;
+	u8 type;
 } __attribute__ ((__packed__));
 
 struct btrfs_inode_timespec {
@@ -473,11 +479,32 @@ static inline void btrfs_set_extent_refs(struct btrfs_extent_item *ei, u32 val)
 	ei->refs = cpu_to_le32(val);
 }
 
+static inline u64 btrfs_extent_owner(struct btrfs_extent_item *ei)
+{
+	return le64_to_cpu(ei->owner);
+}
+
+static inline void btrfs_set_extent_owner(struct btrfs_extent_item *ei, u64 val)
+{
+	ei->owner = cpu_to_le64(val);
+}
+
+static inline u8 btrfs_extent_type(struct btrfs_extent_item *ei)
+{
+	return ei->type;
+}
+
+static inline void btrfs_set_extent_type(struct btrfs_extent_item *ei, u8 val)
+{
+	ei->type = val;
+}
+
 static inline u64 btrfs_node_blockptr(struct btrfs_node *n, int nr)
 {
 	return le64_to_cpu(n->ptrs[nr].blockptr);
 }
 
+
 static inline void btrfs_set_node_blockptr(struct btrfs_node *n, int nr,
 					   u64 val)
 {
@@ -636,6 +663,17 @@ static inline void btrfs_set_header_generation(struct btrfs_header *h,
 	h->generation = cpu_to_le64(val);
 }
 
+static inline u64 btrfs_header_owner(struct btrfs_header *h)
+{
+	return le64_to_cpu(h->owner);
+}
+
+static inline void btrfs_set_header_owner(struct btrfs_header *h,
+					       u64 val)
+{
+	h->owner = cpu_to_le64(val);
+}
+
 static inline u16 btrfs_header_nritems(struct btrfs_header *h)
 {
 	return le16_to_cpu(h->nritems);
@@ -996,9 +1034,10 @@ int btrfs_inc_root_ref(struct btrfs_trans_handle *trans,
 		       struct btrfs_root *root);
 struct buffer_head *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
 					    struct btrfs_root *root);
-int btrfs_alloc_extent(struct btrfs_trans_handle *trans, struct btrfs_root
-			*root, u64 num_blocks, u64 search_start, u64
-			search_end, struct btrfs_key *ins);
+int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
+		       struct btrfs_root *root, u64 owner,
+		       u8 type, u64 num_blocks, u64 search_start,
+		       u64 search_end, struct btrfs_key *ins);
 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
 		  struct buffer_head *buf);
 int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root

fs/btrfs/disk-io.c

@@ -319,6 +319,7 @@ static int __setup_root(int blocksize,
 	root->last_inode_alloc = 0;
 	memset(&root->root_key, 0, sizeof(root->root_key));
 	memset(&root->root_item, 0, sizeof(root->root_item));
+	root->root_key.objectid = objectid;
 	return 0;
 }
 

fs/btrfs/extent-tree.c

@@ -460,9 +460,10 @@ static int find_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
  *
  * returns 0 if everything worked, non-zero otherwise.
  */
-int btrfs_alloc_extent(struct btrfs_trans_handle *trans, struct btrfs_root
-			*root, u64 num_blocks, u64 search_start, u64
-			search_end, struct btrfs_key *ins)
+int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
+		       struct btrfs_root *root, u64 owner,
+		       u8 type, u64 num_blocks, u64 search_start,
+		       u64 search_end, struct btrfs_key *ins)
 {
 	int ret;
 	int pending_ret;
@@ -472,6 +473,8 @@ int btrfs_alloc_extent(struct btrfs_trans_handle *trans, struct btrfs_root
 	struct btrfs_extent_item extent_item;
 
 	btrfs_set_extent_refs(&extent_item, 1);
+	btrfs_set_extent_owner(&extent_item, owner);
+	btrfs_set_extent_type(&extent_item, type);
 
 	if (root == extent_root) {
 		BUG_ON(extent_root->fs_info->current_insert.offset == 0);
@@ -514,7 +517,9 @@ struct buffer_head *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
 	int ret;
 	struct buffer_head *buf;
 
-	ret = btrfs_alloc_extent(trans, root, 1, 0, (unsigned long)-1, &ins);
+	ret = btrfs_alloc_extent(trans, root, root->root_key.objectid,
+				 BTRFS_EXTENT_TREE,
+				 1, 0, (unsigned long)-1, &ins);
 	if (ret) {
 		BUG();
 		return NULL;

fs/btrfs/super.c

@@ -1819,7 +1819,8 @@ static ssize_t btrfs_file_write(struct file *file, const char __user *buf,
 	}
 	if (inode->i_size >= PAGE_CACHE_SIZE || pos + count < inode->i_size ||
 	    pos + count - start_pos > BTRFS_MAX_INLINE_DATA_SIZE(root)) {
-		ret = btrfs_alloc_extent(trans, root, num_blocks, 1,
+		ret = btrfs_alloc_extent(trans, root, inode->i_ino,
+					 BTRFS_EXTENT_FILE, num_blocks, 1,
 					 (u64)-1, &ins);
 		BUG_ON(ret);
 		ret = btrfs_insert_file_extent(trans, root, inode->i_ino,
@@ -2017,8 +2018,12 @@ static int create_subvol(struct btrfs_root *root, char *name, int namelen)
 	btrfs_set_header_level(&leaf->header, 0);
 	btrfs_set_header_blocknr(&leaf->header, bh_blocknr(subvol));
 	btrfs_set_header_generation(&leaf->header, trans->transid);
+	btrfs_set_header_owner(&leaf->header, root->root_key.objectid);
 	memcpy(leaf->header.fsid, root->fs_info->disk_super->fsid,
 	       sizeof(leaf->header.fsid));
+	mark_buffer_dirty(subvol);
+	brelse(subvol);
+	subvol = NULL;
 
 	inode_item = &root_item.inode;
 	memset(inode_item, 0, sizeof(*inode_item));
@@ -2031,10 +2036,6 @@ static int create_subvol(struct btrfs_root *root, char *name, int namelen)
 	btrfs_set_root_blocknr(&root_item, bh_blocknr(subvol));
 	btrfs_set_root_refs(&root_item, 1);
 
-	mark_buffer_dirty(subvol);
-	brelse(subvol);
-	subvol = NULL;
-
 	ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root,
 				       0, &objectid);
 	BUG_ON(ret);