1 files changed, 25 insertions, 8 deletions

diff --git a/arch/s390/hypfs/inode.c b/arch/s390/hypfs/inode.c
index ad4ca75c0f04..5245717295b8 100644
--- a/arch/s390/hypfs/inode.c
+++ b/arch/s390/hypfs/inode.c
@@ -60,17 +60,28 @@ static void hypfs_add_dentry(struct dentry *dentry)
         hypfs_last_dentry = dentry;
 }
 
+static inline int hypfs_positive(struct dentry *dentry)
+{
+        return dentry->d_inode && !d_unhashed(dentry);
+}
+
 static void hypfs_remove(struct dentry *dentry)
 {
         struct dentry *parent;
 
         parent = dentry->d_parent;
-        if (S_ISDIR(dentry->d_inode->i_mode))
-                simple_rmdir(parent->d_inode, dentry);
-        else
-                simple_unlink(parent->d_inode, dentry);
+        if (!parent || !parent->d_inode)
+                return;
+        mutex_lock(&parent->d_inode->i_mutex);
+        if (hypfs_positive(dentry)) {
+                if (S_ISDIR(dentry->d_inode->i_mode))
+                        simple_rmdir(parent->d_inode, dentry);
+                else
+                        simple_unlink(parent->d_inode, dentry);
+        }
         d_delete(dentry);
         dput(dentry);
+        mutex_unlock(&parent->d_inode->i_mutex);
 }
 
 static void hypfs_delete_tree(struct dentry *root)
@@ -315,6 +326,7 @@ static int hypfs_fill_super(struct super_block *sb, void *data, int silent)
         }
         hypfs_update_update(sb);
         sb->s_root = root_dentry;
+        printk(KERN_INFO "hypfs: Hypervisor filesystem mounted\n");
         return 0;
 
 err_tree:
@@ -356,13 +368,17 @@ static struct dentry *hypfs_create_file(struct super_block *sb,
         qname.name = name;
         qname.len = strlen(name);
         qname.hash = full_name_hash(name, qname.len);
+        mutex_lock(&parent->d_inode->i_mutex);
         dentry = lookup_one_len(name, parent, strlen(name));
-        if (IS_ERR(dentry))
-                return ERR_PTR(-ENOMEM);
+        if (IS_ERR(dentry)) {
+                dentry = ERR_PTR(-ENOMEM);
+                goto fail;
+        }
         inode = hypfs_make_inode(sb, mode);
         if (!inode) {
                 dput(dentry);
-                return ERR_PTR(-ENOMEM);
+                dentry = ERR_PTR(-ENOMEM);
+                goto fail;
         }
         if (mode & S_IFREG) {
                 inode->i_fop = &hypfs_file_ops;
@@ -379,6 +395,8 @@ static struct dentry *hypfs_create_file(struct super_block *sb,
         inode->i_private = data;
         d_instantiate(dentry, inode);
         dget(dentry);
+fail:
+        mutex_unlock(&parent->d_inode->i_mutex);
         return dentry;
 }
 
@@ -391,7 +409,6 @@ struct dentry *hypfs_mkdir(struct super_block *sb, struct dentry *parent,
         if (IS_ERR(dentry))
                 return dentry;
         hypfs_add_dentry(dentry);
-        parent->d_inode->i_nlink++;
         return dentry;
 }