1 files changed, 18 insertions, 36 deletions

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 115bc05e42b0..61b16c641ce0 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -1947,7 +1947,7 @@ static int btrfs_writepage_end_io_hook(struct page *page, u64 start, u64 end,
  * extent_io.c will try to find good copies for us.
  */
 static int btrfs_readpage_end_io_hook(struct page *page, u64 start, u64 end,
-                               struct extent_state *state)
+                               struct extent_state *state, int mirror)
 {
         size_t offset = start - ((u64)page->index << PAGE_CACHE_SHIFT);
         struct inode *inode = page->mapping->host;
@@ -4069,7 +4069,7 @@ static struct inode *new_simple_dir(struct super_block *s,
         BTRFS_I(inode)->dummy_inode = 1;
 
         inode->i_ino = BTRFS_EMPTY_SUBVOL_DIR_OBJECTID;
-        inode->i_op = &simple_dir_inode_operations;
+        inode->i_op = &btrfs_dir_ro_inode_operations;
         inode->i_fop = &simple_dir_operations;
         inode->i_mode = S_IFDIR | S_IRUGO | S_IWUSR | S_IXUGO;
         inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
@@ -4140,14 +4140,18 @@ struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry)
 static int btrfs_dentry_delete(const struct dentry *dentry)
 {
         struct btrfs_root *root;
+        struct inode *inode = dentry->d_inode;
 
-        if (!dentry->d_inode && !IS_ROOT(dentry))
-                dentry = dentry->d_parent;
+        if (!inode && !IS_ROOT(dentry))
+                inode = dentry->d_parent->d_inode;
 
-        if (dentry->d_inode) {
-                root = BTRFS_I(dentry->d_inode)->root;
+        if (inode) {
+                root = BTRFS_I(inode)->root;
                 if (btrfs_root_refs(&root->root_item) == 0)
                         return 1;
+
+                if (btrfs_ino(inode) == BTRFS_EMPTY_SUBVOL_DIR_OBJECTID)
+                        return 1;
         }
         return 0;
 }
@@ -4188,7 +4192,6 @@ static int btrfs_real_readdir(struct file *filp, void *dirent,
         struct btrfs_path *path;
         struct list_head ins_list;
         struct list_head del_list;
-        struct qstr q;
         int ret;
         struct extent_buffer *leaf;
         int slot;
@@ -4279,7 +4282,6 @@ static int btrfs_real_readdir(struct file *filp, void *dirent,
 
                 while (di_cur < di_total) {
                         struct btrfs_key location;
-                        struct dentry *tmp;
 
                         if (verify_dir_item(root, leaf, di))
                                 break;
@@ -4300,35 +4302,15 @@ static int btrfs_real_readdir(struct file *filp, void *dirent,
                         d_type = btrfs_filetype_table[btrfs_dir_type(leaf, di)];
                         btrfs_dir_item_key_to_cpu(leaf, di, &location);
 
-                        q.name = name_ptr;
-                        q.len = name_len;
-                        q.hash = full_name_hash(q.name, q.len);
-                        tmp = d_lookup(filp->f_dentry, &q);
-                        if (!tmp) {
-                                struct btrfs_key *newkey;
-
-                                newkey = kzalloc(sizeof(struct btrfs_key),
-                                                 GFP_NOFS);
-                                if (!newkey)
-                                        goto no_dentry;
-                                tmp = d_alloc(filp->f_dentry, &q);
-                                if (!tmp) {
-                                        kfree(newkey);
-                                        dput(tmp);
-                                        goto no_dentry;
-                                }
-                                memcpy(newkey, &location,
-                                       sizeof(struct btrfs_key));
-                                tmp->d_fsdata = newkey;
-                                tmp->d_flags |= DCACHE_NEED_LOOKUP;
-                                d_rehash(tmp);
-                                dput(tmp);
-                        } else {
-                                dput(tmp);
-                        }
-no_dentry:
+
                         /* is this a reference to our own snapshot? If so
-                         * skip it
+                         * skip it.
+                         *
+                         * In contrast to old kernels, we insert the snapshot's
+                         * dir item and dir index after it has been created, so
+                         * we won't find a reference to our own snapshot. We
+                         * still keep the following code for backward
+                         * compatibility.
                          */
                         if (location.type == BTRFS_ROOT_ITEM_KEY &&
                             location.objectid == root->root_key.objectid) {