diff --git a/fs/ceph/dir.c b/fs/ceph/dir.c
index 099a58615b90f73e29368ffba4793e5a17cb66ae..ebafa65a29b6580619c75256195547a5107cb86d 100644
--- a/fs/ceph/dir.c
+++ b/fs/ceph/dir.c
@@ -993,7 +993,7 @@ static int ceph_d_revalidate(struct dentry *dentry, struct nameidata *nd)
 {
 	struct inode *dir;
 
-	if (nd->flags & LOOKUP_RCU)
+	if (nd && nd->flags & LOOKUP_RCU)
 		return -ECHILD;
 
 	dir = dentry->d_parent->d_inode;
diff --git a/fs/dcache.c b/fs/dcache.c
index 2a6bd9a4ae975fdc3eedf9723b551fc9e5f65836..611ffe928c03c7f90aa1c9e0774fa60b86dd1982 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -1523,6 +1523,28 @@ struct dentry * d_alloc_root(struct inode * root_inode)
 }
 EXPORT_SYMBOL(d_alloc_root);
 
+static struct dentry * __d_find_any_alias(struct inode *inode)
+{
+	struct dentry *alias;
+
+	if (list_empty(&inode->i_dentry))
+		return NULL;
+	alias = list_first_entry(&inode->i_dentry, struct dentry, d_alias);
+	__dget(alias);
+	return alias;
+}
+
+static struct dentry * d_find_any_alias(struct inode *inode)
+{
+	struct dentry *de;
+
+	spin_lock(&inode->i_lock);
+	de = __d_find_any_alias(inode);
+	spin_unlock(&inode->i_lock);
+	return de;
+}
+
+
 /**
  * d_obtain_alias - find or allocate a dentry for a given inode
  * @inode: inode to allocate the dentry for
@@ -1552,7 +1574,7 @@ struct dentry *d_obtain_alias(struct inode *inode)
 	if (IS_ERR(inode))
 		return ERR_CAST(inode);
 
-	res = d_find_alias(inode);
+	res = d_find_any_alias(inode);
 	if (res)
 		goto out_iput;
 
@@ -1565,7 +1587,7 @@ struct dentry *d_obtain_alias(struct inode *inode)
 
 
 	spin_lock(&inode->i_lock);
-	res = __d_find_alias(inode, 0);
+	res = __d_find_any_alias(inode);
 	if (res) {
 		spin_unlock(&inode->i_lock);
 		dput(tmp);
diff --git a/fs/fat/namei_vfat.c b/fs/fat/namei_vfat.c
index f88f752babd9c4e2e1054fde3dd7306ec6e457fe..adae3fb7451aa52670d07fdf34381defe133e73a 100644
--- a/fs/fat/namei_vfat.c
+++ b/fs/fat/namei_vfat.c
@@ -43,7 +43,7 @@ static int vfat_revalidate_shortname(struct dentry *dentry)
 
 static int vfat_revalidate(struct dentry *dentry, struct nameidata *nd)
 {
-	if (nd->flags & LOOKUP_RCU)
+	if (nd && nd->flags & LOOKUP_RCU)
 		return -ECHILD;
 
 	/* This is not negative dentry. Always valid. */
@@ -54,7 +54,7 @@ static int vfat_revalidate(struct dentry *dentry, struct nameidata *nd)
 
 static int vfat_revalidate_ci(struct dentry *dentry, struct nameidata *nd)
 {
-	if (nd->flags & LOOKUP_RCU)
+	if (nd && nd->flags & LOOKUP_RCU)
 		return -ECHILD;
 
 	/*
diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c
index 83543b5ff94180742a79970950651c9b95e50e51..8bd0ef9286c376cf980e83b2513764d8bb683eef 100644
--- a/fs/fuse/dir.c
+++ b/fs/fuse/dir.c
@@ -158,7 +158,7 @@ static int fuse_dentry_revalidate(struct dentry *entry, struct nameidata *nd)
 {
 	struct inode *inode;
 
-	if (nd->flags & LOOKUP_RCU)
+	if (nd && nd->flags & LOOKUP_RCU)
 		return -ECHILD;
 
 	inode = entry->d_inode;
diff --git a/fs/gfs2/dentry.c b/fs/gfs2/dentry.c
index 4a456338b8733bdc26864d183c12239f290dd404..0da8da2c991d30a906f954ce021f5373092298f9 100644
--- a/fs/gfs2/dentry.c
+++ b/fs/gfs2/dentry.c
@@ -44,7 +44,7 @@ static int gfs2_drevalidate(struct dentry *dentry, struct nameidata *nd)
 	int error;
 	int had_lock = 0;
 
-	if (nd->flags & LOOKUP_RCU)
+	if (nd && nd->flags & LOOKUP_RCU)
 		return -ECHILD;
 
 	parent = dget_parent(dentry);
diff --git a/fs/jfs/namei.c b/fs/jfs/namei.c
index 81ead850ddb65c722fbd5d1fa8a3f7844428e033..5a2b269428a6d4f19e89659805d0b49d7b0d5297 100644
--- a/fs/jfs/namei.c
+++ b/fs/jfs/namei.c
@@ -1600,7 +1600,7 @@ static int jfs_ci_compare(const struct dentry *parent,
 
 static int jfs_ci_revalidate(struct dentry *dentry, struct nameidata *nd)
 {
-	if (nd->flags & LOOKUP_RCU)
+	if (nd && nd->flags & LOOKUP_RCU)
 		return -ECHILD;
 	/*
 	 * This is not negative dentry. Always valid.
diff --git a/fs/ocfs2/dcache.c b/fs/ocfs2/dcache.c
index 6d80ecc7834f55ff2e7151b38cc6540ad1b08b51..7eb90403fc8af0521b7d3df89d37956ccad054a4 100644
--- a/fs/ocfs2/dcache.c
+++ b/fs/ocfs2/dcache.c
@@ -56,7 +56,7 @@ static int ocfs2_dentry_revalidate(struct dentry *dentry,
 	int ret = 0;    /* if all else fails, just return false */
 	struct ocfs2_super *osb;
 
-	if (nd->flags & LOOKUP_RCU)
+	if (nd && nd->flags & LOOKUP_RCU)
 		return -ECHILD;
 
 	inode = dentry->d_inode;
diff --git a/fs/open.c b/fs/open.c
index 5a2c6ebc22b5d9a1e355050cb14d3218f7a9d0d3..b47aab39c0572242c607495c37c15928fbf8290c 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -233,6 +233,14 @@ int do_fallocate(struct file *file, int mode, loff_t offset, loff_t len)
 
 	if (!(file->f_mode & FMODE_WRITE))
 		return -EBADF;
+
+	/* It's not possible punch hole on append only file */
+	if (mode & FALLOC_FL_PUNCH_HOLE && IS_APPEND(inode))
+		return -EPERM;
+
+	if (IS_IMMUTABLE(inode))
+		return -EPERM;
+
 	/*
 	 * Revalidate the write permissions, in case security policy has
 	 * changed since the files were opened.
diff --git a/fs/proc/base.c b/fs/proc/base.c
index 9d096e82b201090b5a1fdac646f811cc6fa8bc57..d49c4b5d2c3e92c1ed8a4be1ef979df91762c323 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -2620,35 +2620,6 @@ static const struct pid_entry proc_base_stuff[] = {
 		&proc_self_inode_operations, NULL, {}),
 };
 
-/*
- *	Exceptional case: normally we are not allowed to unhash a busy
- * directory. In this case, however, we can do it - no aliasing problems
- * due to the way we treat inodes.
- */
-static int proc_base_revalidate(struct dentry *dentry, struct nameidata *nd)
-{
-	struct inode *inode;
-	struct task_struct *task;
-
-	if (nd->flags & LOOKUP_RCU)
-		return -ECHILD;
-
-	inode = dentry->d_inode;
-	task = get_proc_task(inode);
-	if (task) {
-		put_task_struct(task);
-		return 1;
-	}
-	d_drop(dentry);
-	return 0;
-}
-
-static const struct dentry_operations proc_base_dentry_operations =
-{
-	.d_revalidate	= proc_base_revalidate,
-	.d_delete	= pid_delete_dentry,
-};
-
 static struct dentry *proc_base_instantiate(struct inode *dir,
 	struct dentry *dentry, struct task_struct *task, const void *ptr)
 {
@@ -2685,7 +2656,6 @@ static struct dentry *proc_base_instantiate(struct inode *dir,
 	if (p->fop)
 		inode->i_fop = p->fop;
 	ei->op = p->op;
-	d_set_d_op(dentry, &proc_base_dentry_operations);
 	d_add(dentry, inode);
 	error = NULL;
 out:
diff --git a/fs/reiserfs/xattr.c b/fs/reiserfs/xattr.c
index 3cfb2e93364424886f94807a15031dc90362142d..5c11ca82b7821c55050f0032f55e81d8cdacdcdf 100644
--- a/fs/reiserfs/xattr.c
+++ b/fs/reiserfs/xattr.c
@@ -978,8 +978,6 @@ int reiserfs_permission(struct inode *inode, int mask, unsigned int flags)
 
 static int xattr_hide_revalidate(struct dentry *dentry, struct nameidata *nd)
 {
-	if (nd->flags & LOOKUP_RCU)
-		return -ECHILD;
 	return -EPERM;
 }