Btrfs: drop the inode map tree

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

fs/btrfs/btrfs_inode.h

@@ -2,11 +2,9 @@
 #define __BTRFS_I__
 
 struct btrfs_inode {
-	u32 magic;
 	struct btrfs_root *root;
 	struct btrfs_key location;
 	struct inode vfs_inode;
-	u32 magic2;
 };
 static inline struct btrfs_inode *BTRFS_I(struct inode *inode)
 {

fs/btrfs/ctree.h

@@ -14,9 +14,8 @@ extern struct kmem_cache *btrfs_path_cachep;
 
 #define BTRFS_ROOT_TREE_OBJECTID 1ULL
 #define BTRFS_EXTENT_TREE_OBJECTID 2ULL
-#define BTRFS_INODE_MAP_OBJECTID 3ULL
-#define BTRFS_FS_TREE_OBJECTID 4ULL
-#define BTRFS_FIRST_FREE_OBJECTID 5ULL
+#define BTRFS_FS_TREE_OBJECTID 3ULL
+#define BTRFS_FIRST_FREE_OBJECTID 4ULL
 
 /*
  * we can actually store much bigger names, but lets not confuse the rest
@@ -62,7 +61,6 @@ struct btrfs_header {
 	__le64 blocknr; /* which block this node is supposed to live in */
 	__le64 generation;
 	__le64 parentid; /* objectid of the tree root */
-	__le32 ham;
 	__le16 nritems;
 	__le16 flags;
 	u8 level;
@@ -226,23 +224,16 @@ struct btrfs_csum_item {
 	u8 csum[BTRFS_CSUM_SIZE];
 } __attribute__ ((__packed__));
 
-struct btrfs_inode_map_item {
-	u32 refs;
-} __attribute__ ((__packed__));
-
 struct crypto_hash;
 struct btrfs_fs_info {
 	struct btrfs_root *extent_root;
 	struct btrfs_root *tree_root;
-	struct btrfs_root *inode_root;
 	struct btrfs_key current_insert;
 	struct btrfs_key last_insert;
 	struct radix_tree_root fs_roots_radix;
 	struct radix_tree_root pending_del_radix;
 	struct radix_tree_root pinned_radix;
-	u64 last_inode_alloc;
 	u64 generation;
-	u64 highest_inode;
 	struct btrfs_transaction *running_transaction;
 	struct btrfs_super_block *disk_super;
 	struct buffer_head *sb_buffer;
@@ -272,6 +263,8 @@ struct btrfs_root {
 	u32 blocksize;
 	int ref_cows;
 	u32 type;
+	u64 highest_inode;
+	u64 last_inode_alloc;
 };
 
 /* the lower bits in the key flags defines the item type */
@@ -320,16 +313,11 @@ struct btrfs_root {
  */
 #define BTRFS_EXTENT_ITEM_KEY	8
 
-/*
- * the inode map records which inode numbers are in use and where
- * they actually live on disk
- */
-#define BTRFS_INODE_MAP_ITEM_KEY 9
 /*
  * string items are for debugging.  They just store a short string of
  * data in the FS
  */
-#define BTRFS_STRING_ITEM_KEY	10
+#define BTRFS_STRING_ITEM_KEY	9
 
 static inline u64 btrfs_inode_generation(struct btrfs_inode_item *i)
 {
@@ -883,17 +871,6 @@ static inline void btrfs_set_file_extent_num_blocks(struct
 	e->num_blocks = cpu_to_le64(val);
 }
 
-static inline u32 btrfs_inode_map_refs(struct btrfs_inode_map_item *m)
-{
-	return le32_to_cpu(m->refs);
-}
-
-static inline void btrfs_set_inode_map_refs(struct btrfs_inode_map_item *m,
-					    u32 val)
-{
-	m->refs = cpu_to_le32(val);
-}
-
 static inline struct btrfs_root *btrfs_sb(struct super_block *sb)
 {
 	return sb->s_fs_info;
@@ -996,12 +973,6 @@ int btrfs_match_dir_item_name(struct btrfs_root *root, struct btrfs_path *path,
 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
 			     struct btrfs_root *fs_root,
 			     u64 dirid, u64 *objectid);
-int btrfs_insert_inode_map(struct btrfs_trans_handle *trans,
-			   struct btrfs_root *root,
-			   u64 objectid, struct btrfs_key *location);
-int btrfs_lookup_inode_map(struct btrfs_trans_handle *trans,
-			   struct btrfs_root *root, struct btrfs_path *path,
-			   u64 objectid, int mod);
 int btrfs_find_highest_inode(struct btrfs_root *fs_root, u64 *objectid);
 
 /* inode-item.c */

fs/btrfs/disk-io.c

@@ -264,6 +264,8 @@ static int __setup_root(int blocksize,
 	root->fs_info = fs_info;
 	root->objectid = objectid;
 	root->last_trans = 0;
+	root->highest_inode = 0;
+	root->last_inode_alloc = 0;
 	memset(&root->root_key, 0, sizeof(root->root_key));
 	memset(&root->root_item, 0, sizeof(root->root_item));
 	return 0;
@@ -295,6 +297,7 @@ struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info,
 	struct btrfs_root *tree_root = fs_info->tree_root;
 	struct btrfs_path *path;
 	struct btrfs_leaf *l;
+	u64 highest_inode;
 	int ret = 0;
 
 printk("read_fs_root looking for %Lu %Lu %u\n", location->objectid, location->offset, location->flags);
@@ -354,6 +357,12 @@ printk("radix_tree_insert gives us %d\n", ret);
 		kfree(root);
 		return ERR_PTR(ret);
 	}
+	ret = btrfs_find_highest_inode(root, &highest_inode);
+	if (ret == 0) {
+		root->highest_inode = highest_inode;
+		root->last_inode_alloc = highest_inode;
+printk("highest inode is %Lu\n", highest_inode);
+	}
 printk("all worked\n");
 	return root;
 }
@@ -364,8 +373,6 @@ struct btrfs_root *open_ctree(struct super_block *sb)
 						 GFP_NOFS);
 	struct btrfs_root *tree_root = kmalloc(sizeof(struct btrfs_root),
 					       GFP_NOFS);
-	struct btrfs_root *inode_root = kmalloc(sizeof(struct btrfs_root),
-						GFP_NOFS);
 	struct btrfs_fs_info *fs_info = kmalloc(sizeof(*fs_info),
 						GFP_NOFS);
 	int ret;
@@ -378,9 +385,6 @@ struct btrfs_root *open_ctree(struct super_block *sb)
 	fs_info->running_transaction = NULL;
 	fs_info->tree_root = tree_root;
 	fs_info->extent_root = extent_root;
-	fs_info->inode_root = inode_root;
-	fs_info->last_inode_alloc = 0;
-	fs_info->highest_inode = 0;
 	fs_info->sb = sb;
 	fs_info->btree_inode = new_inode(sb);
 	fs_info->btree_inode->i_ino = 1;
@@ -425,14 +429,7 @@ struct btrfs_root *open_ctree(struct super_block *sb)
 				  BTRFS_EXTENT_TREE_OBJECTID, extent_root);
 	BUG_ON(ret);
 
-	ret = find_and_setup_root(sb->s_blocksize, tree_root, fs_info,
-				  BTRFS_INODE_MAP_OBJECTID, inode_root);
-	BUG_ON(ret);
-
 	fs_info->generation = btrfs_super_generation(disk_super) + 1;
-	ret = btrfs_find_highest_inode(tree_root, &fs_info->last_inode_alloc);
-	if (ret == 0)
-		fs_info->highest_inode = fs_info->last_inode_alloc;
 	memset(&fs_info->kobj, 0, sizeof(fs_info->kobj));
 	kobj_set_kset_s(fs_info, btrfs_subsys);
 	kobject_set_name(&fs_info->kobj, "%s", sb->s_id);
@@ -512,9 +509,6 @@ int close_ctree(struct btrfs_root *root)
 	if (fs_info->extent_root->node)
 		btrfs_block_release(fs_info->extent_root,
 				    fs_info->extent_root->node);
-	if (fs_info->inode_root->node)
-		btrfs_block_release(fs_info->inode_root,
-				    fs_info->inode_root->node);
 	if (fs_info->tree_root->node)
 		btrfs_block_release(fs_info->tree_root,
 				    fs_info->tree_root->node);
@@ -524,7 +518,6 @@ int close_ctree(struct btrfs_root *root)
 	iput(fs_info->btree_inode);
 	del_fs_roots(fs_info);
 	kfree(fs_info->extent_root);
-	kfree(fs_info->inode_root);
 	kfree(fs_info->tree_root);
 	kobject_unregister(&fs_info->kobj);
 	return 0;

fs/btrfs/inode-item.c

@@ -22,6 +22,8 @@ int btrfs_insert_inode(struct btrfs_trans_handle *trans, struct btrfs_root
 				sizeof(*inode_item));
 	btrfs_release_path(root, path);
 	btrfs_free_path(path);
+	if (ret == 0 && objectid > root->highest_inode)
+		root->highest_inode = objectid;
 	return ret;
 }
 

fs/btrfs/inode-map.c

@@ -3,12 +3,11 @@
 #include "disk-io.h"
 #include "transaction.h"
 
-int btrfs_find_highest_inode(struct btrfs_root *fs_root, u64 *objectid)
+int btrfs_find_highest_inode(struct btrfs_root *root, u64 *objectid)
 {
 	struct btrfs_path *path;
 	int ret;
 	struct btrfs_leaf *l;
-	struct btrfs_root *root = fs_root->fs_info->inode_root;
 	struct btrfs_key search_key;
 	int slot;
 
@@ -38,7 +37,7 @@ error:
  * walks the btree of allocated inodes and find a hole.
  */
 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
-			     struct btrfs_root *fs_root,
+			     struct btrfs_root *root,
 			     u64 dirid, u64 *objectid)
 {
 	struct btrfs_path *path;
@@ -49,16 +48,13 @@ int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
 	u64 last_ino = 0;
 	int start_found;
 	struct btrfs_leaf *l;
-	struct btrfs_root *root = fs_root->fs_info->inode_root;
 	struct btrfs_key search_key;
 	u64 search_start = dirid;
 
 	path = btrfs_alloc_path();
 	BUG_ON(!path);
 	search_key.flags = 0;
-	btrfs_set_key_type(&search_key, BTRFS_INODE_MAP_ITEM_KEY);
-
-	search_start = fs_root->fs_info->last_inode_alloc;
+	search_start = root->last_inode_alloc;
 	search_start = max(search_start, BTRFS_FIRST_FREE_OBJECTID);
 	search_key.objectid = search_start;
 	search_key.offset = 0;
@@ -108,7 +104,7 @@ int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
 	}
 	// FIXME -ENOSPC
 found:
-	root->fs_info->last_inode_alloc = *objectid;
+	root->last_inode_alloc = *objectid;
 	btrfs_release_path(root, path);
 	btrfs_free_path(path);
 	BUG_ON(*objectid < search_start);
@@ -118,56 +114,3 @@ error:
 	btrfs_free_path(path);
 	return ret;
 }
-
-int btrfs_insert_inode_map(struct btrfs_trans_handle *trans,
-			   struct btrfs_root *fs_root,
-			   u64 objectid, struct btrfs_key *location)
-{
-	int ret = 0;
-	struct btrfs_path *path;
-	struct btrfs_inode_map_item *inode_item;
-	struct btrfs_key key;
-	struct btrfs_root *inode_root = fs_root->fs_info->inode_root;
-
-	key.objectid = objectid;
-	key.flags = 0;
-	btrfs_set_key_type(&key, BTRFS_INODE_MAP_ITEM_KEY);
-	key.offset = 0;
-	path = btrfs_alloc_path();
-	BUG_ON(!path);
-	btrfs_init_path(path);
-	ret = btrfs_insert_empty_item(trans, inode_root, path, &key,
-				      sizeof(struct btrfs_inode_map_item));
-	if (ret)
-		goto out;
-
-	inode_item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
-				    path->slots[0], struct btrfs_inode_map_item);
-	btrfs_cpu_key_to_disk(&inode_item->key, location);
-	btrfs_mark_buffer_dirty(path->nodes[0]);
-	if (objectid > fs_root->fs_info->highest_inode)
-		fs_root->fs_info->highest_inode = objectid;
-out:
-	btrfs_release_path(inode_root, path);
-	btrfs_free_path(path);
-	return ret;
-}
-
-int btrfs_lookup_inode_map(struct btrfs_trans_handle *trans,
-			   struct btrfs_root *fs_root, struct btrfs_path *path,
-			   u64 objectid, int mod)
-{
-	int ret;
-	struct btrfs_key key;
-	int ins_len = mod < 0 ? -1 : 0;
-	int cow = mod != 0;
-	struct btrfs_root *inode_root = fs_root->fs_info->inode_root;
-
-	key.objectid = objectid;
-	key.flags = 0;
-	key.offset = 0;
-	btrfs_set_key_type(&key, BTRFS_INODE_MAP_ITEM_KEY);
-	ret = btrfs_search_slot(trans, inode_root, &key, path, ins_len, cow);
-	return ret;
-}
-

fs/btrfs/print-tree.c

@@ -10,7 +10,6 @@ void btrfs_print_leaf(struct btrfs_root *root, struct btrfs_leaf *l)
 	struct btrfs_extent_item *ei;
 	struct btrfs_root_item *ri;
 	struct btrfs_dir_item *di;
-	struct btrfs_inode_map_item *mi;
 	struct btrfs_inode_item *ii;
 	u32 type;
 
@@ -54,13 +53,6 @@ void btrfs_print_leaf(struct btrfs_root *root, struct btrfs_leaf *l)
 			printk("\t\textent data refs %u owner %Lu\n",
 				btrfs_extent_refs(ei), btrfs_extent_owner(ei));
 			break;
-		case BTRFS_INODE_MAP_ITEM_KEY:
-			mi = btrfs_item_ptr(l, i, struct btrfs_inode_map_item);
-			printk("\t\tinode map key %Lu %u %Lu\n",
-			       btrfs_disk_key_objectid(&mi->key),
-			       btrfs_disk_key_flags(&mi->key),
-			       btrfs_disk_key_offset(&mi->key));
-			break;
 		case BTRFS_STRING_ITEM_KEY:
 			printk("\t\titem data %.*s\n", btrfs_item_size(item),
 				btrfs_leaf_data(l) + btrfs_item_offset(item));

fs/btrfs/super.c

@@ -45,14 +45,6 @@ static struct inode_operations btrfs_file_inode_operations;
 static struct address_space_operations btrfs_aops;
 static struct file_operations btrfs_file_operations;
 
-static int check_inode(struct inode *inode)
-{
-	struct btrfs_inode *ei = BTRFS_I(inode);
-	WARN_ON(ei->magic != 0xDEADBEEF);
-	WARN_ON(ei->magic2 != 0xDEADBEAF);
-	return 0;
-}
-
 static void btrfs_read_locked_inode(struct inode *inode)
 {
 	struct btrfs_path *path;
@@ -66,15 +58,12 @@ static void btrfs_read_locked_inode(struct inode *inode)
 	btrfs_init_path(path);
 	mutex_lock(&root->fs_info->fs_mutex);
 
-	check_inode(inode);
-
 	memcpy(&location, &BTRFS_I(inode)->location, sizeof(location));
 	ret = btrfs_lookup_inode(NULL, root, path, &location, 0);
 	if (ret) {
 		btrfs_free_path(path);
 		goto make_bad;
 	}
-	check_inode(inode);
 	inode_item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
 				  path->slots[0],
 				  struct btrfs_inode_item);
@@ -97,7 +86,7 @@ static void btrfs_read_locked_inode(struct inode *inode)
 	inode_item = NULL;
 
 	mutex_unlock(&root->fs_info->fs_mutex);
-	check_inode(inode);
+
 	switch (inode->i_mode & S_IFMT) {
 #if 0
 	default:
@@ -121,7 +110,6 @@ static void btrfs_read_locked_inode(struct inode *inode)
 		// inode->i_op = &page_symlink_inode_operations;
 		break;
 	}
-	check_inode(inode);
 	return;
 
 make_bad:
@@ -272,10 +260,7 @@ static int btrfs_free_inode(struct btrfs_trans_handle *trans,
 			    struct btrfs_root *root,
 			    struct inode *inode)
 {
-	u64 objectid = inode->i_ino;
 	struct btrfs_path *path;
-	struct btrfs_inode_map_item *map;
-	struct btrfs_key stat_data_key;
 	int ret;
 
 	clear_inode(inode);
@@ -283,26 +268,11 @@ static int btrfs_free_inode(struct btrfs_trans_handle *trans,
 	path = btrfs_alloc_path();
 	BUG_ON(!path);
 	btrfs_init_path(path);
-	ret = btrfs_lookup_inode_map(trans, root, path, objectid, -1);
-	if (ret) {
-		if (ret > 0)
-			ret = -ENOENT;
-		goto error;
-	}
-	map = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), path->slots[0],
-			    struct btrfs_inode_map_item);
-	btrfs_disk_key_to_cpu(&stat_data_key, &map->key);
-	ret = btrfs_del_item(trans, root->fs_info->inode_root, path);
-	BUG_ON(ret);
-	btrfs_release_path(root, path);
-
 	ret = btrfs_lookup_inode(trans, root, path,
 				 &BTRFS_I(inode)->location, -1);
 	BUG_ON(ret);
 	ret = btrfs_del_item(trans, root, path);
 	BUG_ON(ret);
-error:
-	btrfs_release_path(root, path);
 	btrfs_free_path(path);
 	return ret;
 }
@@ -432,7 +402,6 @@ static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry,
 out:
 	btrfs_release_path(root, path);
 	btrfs_free_path(path);
-	check_inode(dir);
 	return ret;
 }
 
@@ -540,9 +509,7 @@ printk("adding new root for inode %lu root %p (found %p)\n", inode->i_ino, sub_r
 			btrfs_read_locked_inode(inode);
 			unlock_new_inode(inode);
 		}
-		check_inode(inode);
 	}
-	check_inode(dir);
 	return d_splice_alias(inode, dentry);
 }
 
@@ -566,7 +533,6 @@ static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
 	/* FIXME, use a real flag for deciding about the key type */
 	if (root->fs_info->tree_root == root)
 		key_type = BTRFS_DIR_ITEM_KEY;
-
 	mutex_lock(&root->fs_info->fs_mutex);
 	key.objectid = inode->i_ino;
 	key.flags = 0;
@@ -575,9 +541,8 @@ static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
 	path = btrfs_alloc_path();
 	btrfs_init_path(path);
 	ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
-	if (ret < 0) {
+	if (ret < 0)
 		goto err;
-	}
 	advance = 0;
 	while(1) {
 		leaf = btrfs_buffer_leaf(path->nodes[0]);
@@ -601,8 +566,7 @@ static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
 		if (btrfs_disk_key_objectid(&item->key) != key.objectid)
 			break;
 		if (key_type == BTRFS_DIR_INDEX_KEY &&
-		    btrfs_disk_key_offset(&item->key) >
-		    root->fs_info->highest_inode)
+		    btrfs_disk_key_offset(&item->key) > root->highest_inode)
 			break;
 		if (btrfs_disk_key_type(&item->key) != key_type)
 			continue;
@@ -707,7 +671,6 @@ static void fill_inode_item(struct btrfs_inode_item *item,
 	btrfs_set_timespec_nsec(&item->ctime, inode->i_ctime.tv_nsec);
 	btrfs_set_inode_nblocks(item, inode->i_blocks);
 	btrfs_set_inode_generation(item, inode->i_generation);
-	check_inode(inode);
 }
 
 static int btrfs_update_inode(struct btrfs_trans_handle *trans,
@@ -721,7 +684,6 @@ static int btrfs_update_inode(struct btrfs_trans_handle *trans,
 	path = btrfs_alloc_path();
 	BUG_ON(!path);
 	btrfs_init_path(path);
-
 	ret = btrfs_lookup_inode(trans, root, path,
 				 &BTRFS_I(inode)->location, 1);
 	if (ret) {
@@ -736,11 +698,11 @@ static int btrfs_update_inode(struct btrfs_trans_handle *trans,
 
 	fill_inode_item(inode_item, inode);
 	btrfs_mark_buffer_dirty(path->nodes[0]);
+	ret = 0;
 failed:
 	btrfs_release_path(root, path);
 	btrfs_free_path(path);
-	check_inode(inode);
-	return 0;
+	return ret;
 }
 
 static int btrfs_write_inode(struct inode *inode, int wait)
@@ -757,7 +719,6 @@ static int btrfs_write_inode(struct inode *inode, int wait)
 	else
 		btrfs_end_transaction(trans, root);
 	mutex_unlock(&root->fs_info->fs_mutex);
-	check_inode(inode);
 	return ret;
 }
 
@@ -767,7 +728,7 @@ static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans,
 	struct inode *inode;
 	struct btrfs_inode_item inode_item;
 	struct btrfs_root *root = BTRFS_I(dir)->root;
-	struct btrfs_key *key;
+	struct btrfs_key *location;
 	int ret;
 	u64 objectid;
 
@@ -776,8 +737,6 @@ static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans,
 		return ERR_PTR(-ENOMEM);
 
 	BTRFS_I(inode)->root = BTRFS_I(dir)->root;
-	key = &BTRFS_I(inode)->location;
-	check_inode(inode);
 	ret = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
 	BUG_ON(ret);
 
@@ -788,20 +747,16 @@ static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans,
 	inode->i_blocks = 0;
 	inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
 	fill_inode_item(&inode_item, inode);
-
-	key->objectid = objectid;
-	key->flags = 0;
-	key->offset = 0;
-	btrfs_set_key_type(key, BTRFS_INODE_ITEM_KEY);
-	ret = btrfs_insert_inode_map(trans, root, objectid, key);
-	BUG_ON(ret);
+	location = &BTRFS_I(inode)->location;
+	location->objectid = objectid;
+	location->flags = 0;
+	location->offset = 0;
+	btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY);
 
 	ret = btrfs_insert_inode(trans, root, objectid, &inode_item);
 	BUG_ON(ret);
 
 	insert_inode_hash(inode);
-	check_inode(inode);
-	check_inode(dir);
 	return inode;
 }
 
@@ -825,8 +780,6 @@ static int btrfs_add_link(struct btrfs_trans_handle *trans,
 		ret = btrfs_update_inode(trans, root,
 					 dentry->d_parent->d_inode);
 	}
-	check_inode(inode);
-	check_inode(dentry->d_parent->d_inode);
 	return ret;
 }
 
@@ -840,7 +793,6 @@ static int btrfs_add_nondir(struct btrfs_trans_handle *trans,
 	}
 	if (err > 0)
 		err = -EEXIST;
-	check_inode(inode);
 	return err;
 }
 
@@ -872,8 +824,6 @@ static int btrfs_create(struct inode *dir, struct dentry *dentry,
 out_unlock:
 	btrfs_end_transaction(trans, root);
 	mutex_unlock(&root->fs_info->fs_mutex);
-	check_inode(inode);
-	check_inode(dir);
 
 	if (drop_inode) {
 		inode_dec_link_count(inode);
@@ -1701,20 +1651,14 @@ static int create_snapshot(struct btrfs_root *root, char *name, int namelen)
 	ret = btrfs_update_inode(trans, root, root->inode);
 	BUG_ON(ret);
 
-	ret = btrfs_find_free_objectid(trans, root, 0, &objectid);
+	ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root,
+				       0, &objectid);
 	BUG_ON(ret);
 
 	memset(&new_root_item, 0, sizeof(new_root_item));
 	memcpy(&new_root_item, &root->root_item,
 	       sizeof(new_root_item));
 
-	key.objectid = objectid;
-	key.flags = 0;
-	key.offset = 0;
-	btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY);
-	ret = btrfs_insert_inode_map(trans, root, objectid, &key);
-	BUG_ON(ret);
-
 	key.objectid = objectid;
 	key.offset = 1;
 	key.flags = 0;
@@ -1791,21 +1735,14 @@ static struct inode *btrfs_alloc_inode(struct super_block *sb)
 	ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS);
 	if (!ei)
 		return NULL;
-	ei->magic = 0xDEADBEEF;
-	ei->magic2 = 0xDEADBEAF;
 	return &ei->vfs_inode;
 }
 
 static void btrfs_destroy_inode(struct inode *inode)
 {
-	struct btrfs_inode *ei = BTRFS_I(inode);
-	WARN_ON(ei->magic != 0xDEADBEEF);
-	WARN_ON(ei->magic2 != 0xDEADBEAF);
 	WARN_ON(!list_empty(&inode->i_dentry));
 	WARN_ON(inode->i_data.nrpages);
 
-	ei->magic = 0;
-	ei->magic2 = 0;
 	kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode));
 }
 

fs/btrfs/transaction.c

@@ -115,14 +115,7 @@ int btrfs_commit_tree_roots(struct btrfs_trans_handle *trans,
 	struct btrfs_fs_info *fs_info = root->fs_info;
 	struct btrfs_root *tree_root = fs_info->tree_root;
 	struct btrfs_root *extent_root = fs_info->extent_root;
-	struct btrfs_root *inode_root = fs_info->inode_root;
 
-	btrfs_set_root_blocknr(&inode_root->root_item,
-			       inode_root->node->b_blocknr);
-	ret = btrfs_update_root(trans, tree_root,
-				&inode_root->root_key,
-				&inode_root->root_item);
-	BUG_ON(ret);
 	while(1) {
 		old_extent_block = btrfs_root_blocknr(&extent_root->root_item);
 		if (old_extent_block == extent_root->node->b_blocknr)