btrfs: Code cleanup

Attaching below is some of the code cleanups that i came across while
reading the code.

a) alloc_path already calls init_path.
b) Mention that btrfs_inode is the in memory copy.Ext4 have ext4_inode_info as
the in memory copy ext4_inode as the disk copy

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

8 files changed, 2 insertions, 21 deletions

diff --git a/fs/btrfs/btrfs_inode.h b/fs/btrfs/btrfs_inode.h
index 783f06b63259..6bce46be49ff 100644
--- a/fs/btrfs/btrfs_inode.h
+++ b/fs/btrfs/btrfs_inode.h
@@ -19,6 +19,7 @@
 #ifndef __BTRFS_I__
 #define __BTRFS_I__
 
+/* in memory btrfs inode */
 struct btrfs_inode {
         struct btrfs_root *root;
         struct btrfs_block_group_cache *block_group;
diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index 4736155af419..498dea0854c1 100644
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -1647,7 +1647,6 @@ int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
 
         path = btrfs_alloc_path();
         BUG_ON(!path);
-        btrfs_init_path(path);
         ret = btrfs_insert_empty_item(trans, root, path, cpu_key, data_size);
         if (!ret) {
                 ptr = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
diff --git a/fs/btrfs/dir-item.c b/fs/btrfs/dir-item.c
index 0d179a44ebf4..ff10cf5a8422 100644
--- a/fs/btrfs/dir-item.c
+++ b/fs/btrfs/dir-item.c
@@ -74,7 +74,6 @@ int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
         ret = btrfs_name_hash(name, name_len, &key.offset);
         BUG_ON(ret);
         path = btrfs_alloc_path();
-        btrfs_init_path(path);
         data_size = sizeof(*dir_item) + name_len;
         dir_item = insert_with_overflow(trans, root, path, &key, data_size,
                                         name, name_len);
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 975a0eb9241b..5f4eaba8b85f 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -402,7 +402,6 @@ int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
                          &ins, 0);
         path = btrfs_alloc_path();
         BUG_ON(!path);
-        btrfs_init_path(path);
         key.objectid = blocknr;
         key.flags = 0;
         btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY);
@@ -437,7 +436,6 @@ static int lookup_extent_ref(struct btrfs_trans_handle *trans,
         struct btrfs_extent_item *item;
 
         path = btrfs_alloc_path();
-        btrfs_init_path(path);
         key.objectid = blocknr;
         key.offset = num_blocks;
         key.flags = 0;
@@ -807,7 +805,6 @@ static int __free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
         find_free_extent(trans, root, 0, 0, (u64)-1, 0, &ins, 0);
         path = btrfs_alloc_path();
         BUG_ON(!path);
-        btrfs_init_path(path);
 
         ret = btrfs_search_slot(trans, extent_root, &key, path, -1, 1);
         if (ret) {
@@ -1463,7 +1460,6 @@ int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
 
         path = btrfs_alloc_path();
         BUG_ON(!path);
-        btrfs_init_path(path);
 
         level = btrfs_header_level(btrfs_buffer_header(snap));
         orig_level = level;
diff --git a/fs/btrfs/file-item.c b/fs/btrfs/file-item.c
index 37dd3801a107..3c140cc1dd05 100644
--- a/fs/btrfs/file-item.c
+++ b/fs/btrfs/file-item.c
@@ -38,7 +38,6 @@ int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
 
         path = btrfs_alloc_path();
         BUG_ON(!path);
-        btrfs_init_path(path);
         file_key.objectid = objectid;
         file_key.offset = pos;
         file_key.flags = 0;
@@ -274,7 +273,6 @@ int btrfs_csum_verify_file_block(struct btrfs_root *root,
 
         path = btrfs_alloc_path();
         BUG_ON(!path);
-        btrfs_init_path(path);
         file_key.objectid = objectid;
         file_key.offset = offset;
         file_key.flags = 0;
diff --git a/fs/btrfs/inode-item.c b/fs/btrfs/inode-item.c
index 449e9dbdf957..e8b5a9f7c0c2 100644
--- a/fs/btrfs/inode-item.c
+++ b/fs/btrfs/inode-item.c
@@ -35,7 +35,6 @@ int btrfs_insert_inode(struct btrfs_trans_handle *trans, struct btrfs_root
 
         path = btrfs_alloc_path();
         BUG_ON(!path);
-        btrfs_init_path(path);
         ret = btrfs_insert_item(trans, root, &key, inode_item,
                                 sizeof(*inode_item));
         btrfs_release_path(root, path);
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index d3d5a4cdb6af..e639cc9e089f 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -79,7 +79,6 @@ void btrfs_read_locked_inode(struct inode *inode)
 
         path = btrfs_alloc_path();
         BUG_ON(!path);
-        btrfs_init_path(path);
         mutex_lock(&root->fs_info->fs_mutex);
 
         memcpy(&location, &BTRFS_I(inode)->location, sizeof(location));
@@ -177,7 +176,6 @@ 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) {
@@ -214,7 +212,6 @@ static int btrfs_unlink_trans(struct btrfs_trans_handle *trans,
 
         path = btrfs_alloc_path();
         BUG_ON(!path);
-        btrfs_init_path(path);
         di = btrfs_lookup_dir_item(trans, root, path, dir->i_ino,
                                     name, name_len, -1);
         if (IS_ERR(di)) {
@@ -289,7 +286,6 @@ static int btrfs_rmdir(struct inode *dir, struct dentry *dentry)
 
         path = btrfs_alloc_path();
         BUG_ON(!path);
-        btrfs_init_path(path);
         mutex_lock(&root->fs_info->fs_mutex);
         trans = btrfs_start_transaction(root, 1);
         btrfs_set_trans_block_group(trans, dir);
@@ -360,7 +356,6 @@ 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(trans, root, path,
                                  &BTRFS_I(inode)->location, -1);
         BUG_ON(ret);
@@ -687,7 +682,6 @@ static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry,
 
         path = btrfs_alloc_path();
         BUG_ON(!path);
-        btrfs_init_path(path);
         di = btrfs_lookup_dir_item(NULL, root, path, dir->i_ino, name,
                                     namelen, 0);
         if (!di || IS_ERR(di)) {
@@ -874,7 +868,6 @@ static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
         btrfs_set_key_type(&key, key_type);
         key.offset = filp->f_pos;
         path = btrfs_alloc_path();
-        btrfs_init_path(path);
         ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
         if (ret < 0)
                 goto err;
@@ -1263,7 +1256,6 @@ static int btrfs_get_block_lock(struct inode *inode, sector_t iblock,
 
         path = btrfs_alloc_path();
         BUG_ON(!path);
-        btrfs_init_path(path);
         if (create & BTRFS_GET_BLOCK_CREATE) {
                 WARN_ON(1);
                 /* this almost but not quite works */
@@ -1280,7 +1272,7 @@ static int btrfs_get_block_lock(struct inode *inode, sector_t iblock,
         }
 
         ret = btrfs_lookup_file_extent(NULL, root, path,
-                                       inode->i_ino,
+                                       objectid,
                                        iblock << inode->i_blkbits, 0);
         if (ret < 0) {
                 err = ret;
diff --git a/fs/btrfs/root-tree.c b/fs/btrfs/root-tree.c
index 7a2d63c1ee80..8e1b9046d5ec 100644
--- a/fs/btrfs/root-tree.c
+++ b/fs/btrfs/root-tree.c
@@ -36,7 +36,6 @@ int btrfs_find_last_root(struct btrfs_root *root, u64 objectid,
 
         path = btrfs_alloc_path();
         BUG_ON(!path);
-        btrfs_init_path(path);
         ret = btrfs_search_slot(NULL, root, &search_key, path, 0, 0);
         if (ret < 0)
                 goto out;
@@ -70,7 +69,6 @@ int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
 
         path = btrfs_alloc_path();
         BUG_ON(!path);
-        btrfs_init_path(path);
         ret = btrfs_search_slot(trans, root, key, path, 0, 1);
         if (ret < 0)
                 goto out;
@@ -106,7 +104,6 @@ int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
 
         path = btrfs_alloc_path();
         BUG_ON(!path);
-        btrfs_init_path(path);
         ret = btrfs_search_slot(trans, root, key, path, -1, 1);
         if (ret < 0)
                 goto out;