Merge branch 'akpm' (patches from Andrew)

Merge updates from Andrew Morton: - a few misc things - ocfs2 updates - v9fs updates - MM - procfs updates - lib/ updates - autofs updates * emailed patches from Andrew Morton <akpm@linux-foundation.org>: (118 commits) autofs: small cleanup in autofs_getpath() autofs: clean up includes autofs: comment on selinux changes needed for module autoload autofs: update MAINTAINERS entry for autofs autofs: use autofs instead of autofs4 in documentation autofs: rename autofs documentation files autofs: create autofs Kconfig and Makefile autofs: delete fs/autofs4 source files autofs: update fs/autofs4/Makefile autofs: update fs/autofs4/Kconfig autofs: copy autofs4 to autofs autofs4: use autofs instead of autofs4 everywhere autofs4: merge auto_fs.h and auto_fs4.h fs/binfmt_misc.c: do not allow offset overflow checkpatch: improve patch recognition lib/ucs2_string.c: add MODULE_LICENSE() lib/mpi: headers cleanup lib/percpu_ida.c: use _irqsave() instead of local_irq_save() + spin_lock lib/idr.c: remove simple_ida_lock lib/bitmap.c: micro-optimization for __bitmap_complement() ...
author: Linus Torvalds <torvalds@linux-foundation.org> 2018-06-07 18:39:37 -0700
committer: Linus Torvalds <torvalds@linux-foundation.org> 2018-06-07 18:39:37 -0700
commit: 68abbe729567cef128b2c2141f2ed2567f3b8372 (patch)
tree: aa75c39cc815eee4d7cc8db2988fe10879fccd3e /fs
parent: ba1b7309fc2e909a5828c36a7cd187e5d7df6f53 (diff)
parent: 016e92da037e0b43dd5e5848c19b0b9749506963 (diff)
download: linux-68abbe729567cef128b2c2141f2ed2567f3b8372.tar.bz2
34 files changed, 668 insertions, 590 deletions
diff --git a/fs/9p/v9fs.c b/fs/9p/v9fs.c
index e622f0f10502..0429c8ee58f1 100644
--- a/fs/9p/v9fs.c
+++ b/fs/9p/v9fs.c
@@ -210,12 +210,12 @@ static int v9fs_parse_options(struct v9fs_session_info *v9ses, char *opts)
 				p9_debug(P9_DEBUG_ERROR,
 					 "integer field, but no integer?\n");
 				ret = r;
-				continue;
-			}
-			v9ses->debug = option;
+			} else {
+				v9ses->debug = option;
 #ifdef CONFIG_NET_9P_DEBUG
-			p9_debug_level = option;
+				p9_debug_level = option;
 #endif
+			}
 			break;
 
 		case Opt_dfltuid:
@@ -231,7 +231,6 @@ static int v9fs_parse_options(struct v9fs_session_info *v9ses, char *opts)
 				p9_debug(P9_DEBUG_ERROR,
 					 "uid field, but not a uid?\n");
 				ret = -EINVAL;
-				continue;
 			}
 			break;
 		case Opt_dfltgid:
@@ -247,7 +246,6 @@ static int v9fs_parse_options(struct v9fs_session_info *v9ses, char *opts)
 				p9_debug(P9_DEBUG_ERROR,
 					 "gid field, but not a gid?\n");
 				ret = -EINVAL;
-				continue;
 			}
 			break;
 		case Opt_afid:
@@ -256,9 +254,9 @@ static int v9fs_parse_options(struct v9fs_session_info *v9ses, char *opts)
 				p9_debug(P9_DEBUG_ERROR,
 					 "integer field, but no integer?\n");
 				ret = r;
-				continue;
+			} else {
+				v9ses->afid = option;
 			}
-			v9ses->afid = option;
 			break;
 		case Opt_uname:
 			kfree(v9ses->uname);
@@ -306,13 +304,12 @@ static int v9fs_parse_options(struct v9fs_session_info *v9ses, char *opts)
 					 "problem allocating copy of cache arg\n");
 				goto free_and_return;
 			}
-			ret = get_cache_mode(s);
-			if (ret == -EINVAL) {
-				kfree(s);
-				goto free_and_return;
-			}
+			r = get_cache_mode(s);
+			if (r < 0)
+				ret = r;
+			else
+				v9ses->cache = r;
 
-			v9ses->cache = ret;
 			kfree(s);
 			break;
 
@@ -341,14 +338,12 @@ static int v9fs_parse_options(struct v9fs_session_info *v9ses, char *opts)
 					pr_info("Unknown access argument %s\n",
 						s);
 					kfree(s);
-					goto free_and_return;
+					continue;
 				}
 				v9ses->uid = make_kuid(current_user_ns(), uid);
 				if (!uid_valid(v9ses->uid)) {
 					ret = -EINVAL;
 					pr_info("Uknown uid %s\n", s);
-					kfree(s);
-					goto free_and_return;
 				}
 			}
 
diff --git a/fs/Kconfig b/fs/Kconfig
index ac4ac908f001..40cdae75e3b4 100644
--- a/fs/Kconfig
+++ b/fs/Kconfig
@@ -108,6 +108,7 @@ source "fs/notify/Kconfig"
 
 source "fs/quota/Kconfig"
 
+source "fs/autofs/Kconfig"
 source "fs/autofs4/Kconfig"
 source "fs/fuse/Kconfig"
 source "fs/overlayfs/Kconfig"
@@ -203,6 +204,9 @@ config HUGETLBFS
 config HUGETLB_PAGE
 	def_bool HUGETLBFS
 
+config MEMFD_CREATE
+	def_bool TMPFS || HUGETLBFS
+
 config ARCH_HAS_GIGANTIC_PAGE
 	bool
 
diff --git a/fs/Makefile b/fs/Makefile
index c9375fd2c8c4..2e005525cc19 100644
--- a/fs/Makefile
+++ b/fs/Makefile
@@ -102,6 +102,7 @@ obj-$(CONFIG_AFFS_FS)		+= affs/
 obj-$(CONFIG_ROMFS_FS)		+= romfs/
 obj-$(CONFIG_QNX4FS_FS)		+= qnx4/
 obj-$(CONFIG_QNX6FS_FS)		+= qnx6/
+obj-$(CONFIG_AUTOFS_FS)		+= autofs/
 obj-$(CONFIG_AUTOFS4_FS)	+= autofs4/
 obj-$(CONFIG_ADFS_FS)		+= adfs/
 obj-$(CONFIG_FUSE_FS)		+= fuse/
diff --git a/fs/autofs/Kconfig b/fs/autofs/Kconfig
new file mode 100644
index 000000000000..6a2064eb3b27
--- /dev/null
+++ b/fs/autofs/Kconfig
@@ -0,0 +1,20 @@
+config AUTOFS_FS
+	tristate "Kernel automounter support (supports v3, v4 and v5)"
+	default n
+	help
+	   The automounter is a tool to automatically mount remote file systems
+	   on demand. This implementation is partially kernel-based to reduce
+	   overhead in the already-mounted case; this is unlike the BSD
+	   automounter (amd), which is a pure user space daemon.
+
+	   To use the automounter you need the user-space tools from
+	   <https://www.kernel.org/pub/linux/daemons/autofs/>; you also want
+	   to answer Y to "NFS file system support", below.
+
+	   To compile this support as a module, choose M here: the module will be
+	   called autofs.
+
+	   If you are not a part of a fairly large, distributed network or
+	   don't have a laptop which needs to dynamically reconfigure to the
+	   local network, you probably do not need an automounter, and can say
+	   N here.
diff --git a/fs/autofs/Makefile b/fs/autofs/Makefile
new file mode 100644
index 000000000000..43fedde15c26
--- /dev/null
+++ b/fs/autofs/Makefile
@@ -0,0 +1,7 @@
+#
+# Makefile for the linux autofs-filesystem routines.
+#
+
+obj-$(CONFIG_AUTOFS_FS) += autofs.o
+
+autofs-objs := init.o inode.o root.o symlink.o waitq.o expire.o dev-ioctl.o
diff --git a/fs/autofs4/autofs_i.h b/fs/autofs/autofs_i.h
index 4737615f0eaa..9400a9f6318a 100644
--- a/fs/autofs4/autofs_i.h
+++ b/fs/autofs/autofs_i.h
@@ -9,7 +9,7 @@
 
 /* Internal header file for autofs */
 
-#include <linux/auto_fs4.h>
+#include <linux/auto_fs.h>
 #include <linux/auto_dev-ioctl.h>
 
 #include <linux/kernel.h>
@@ -25,7 +25,7 @@
 #include <linux/spinlock.h>
 #include <linux/list.h>
 #include <linux/completion.h>
-#include <asm/current.h>
+#include <linux/file.h>
 
 /* This is the range of ioctl() numbers we claim as ours */
 #define AUTOFS_IOC_FIRST     AUTOFS_IOC_READY
@@ -122,44 +122,44 @@ struct autofs_sb_info {
 	struct rcu_head rcu;
 };
 
-static inline struct autofs_sb_info *autofs4_sbi(struct super_block *sb)
+static inline struct autofs_sb_info *autofs_sbi(struct super_block *sb)
 {
 	return (struct autofs_sb_info *)(sb->s_fs_info);
 }
 
-static inline struct autofs_info *autofs4_dentry_ino(struct dentry *dentry)
+static inline struct autofs_info *autofs_dentry_ino(struct dentry *dentry)
 {
 	return (struct autofs_info *)(dentry->d_fsdata);
 }
 
-/* autofs4_oz_mode(): do we see the man behind the curtain?  (The
+/* autofs_oz_mode(): do we see the man behind the curtain?  (The
  * processes which do manipulations for us in user space sees the raw
  * filesystem without "magic".)
  */
-static inline int autofs4_oz_mode(struct autofs_sb_info *sbi)
+static inline int autofs_oz_mode(struct autofs_sb_info *sbi)
 {
 	return sbi->catatonic || task_pgrp(current) == sbi->oz_pgrp;
 }
 
-struct inode *autofs4_get_inode(struct super_block *, umode_t);
-void autofs4_free_ino(struct autofs_info *);
+struct inode *autofs_get_inode(struct super_block *, umode_t);
+void autofs_free_ino(struct autofs_info *);
 
 /* Expiration */
-int is_autofs4_dentry(struct dentry *);
-int autofs4_expire_wait(const struct path *path, int rcu_walk);
-int autofs4_expire_run(struct super_block *, struct vfsmount *,
-		       struct autofs_sb_info *,
-		       struct autofs_packet_expire __user *);
-int autofs4_do_expire_multi(struct super_block *sb, struct vfsmount *mnt,
-			    struct autofs_sb_info *sbi, int when);
-int autofs4_expire_multi(struct super_block *, struct vfsmount *,
-			 struct autofs_sb_info *, int __user *);
-struct dentry *autofs4_expire_direct(struct super_block *sb,
-				     struct vfsmount *mnt,
-				     struct autofs_sb_info *sbi, int how);
-struct dentry *autofs4_expire_indirect(struct super_block *sb,
-				       struct vfsmount *mnt,
-				       struct autofs_sb_info *sbi, int how);
+int is_autofs_dentry(struct dentry *);
+int autofs_expire_wait(const struct path *path, int rcu_walk);
+int autofs_expire_run(struct super_block *, struct vfsmount *,
+		      struct autofs_sb_info *,
+		      struct autofs_packet_expire __user *);
+int autofs_do_expire_multi(struct super_block *sb, struct vfsmount *mnt,
+			   struct autofs_sb_info *sbi, int when);
+int autofs_expire_multi(struct super_block *, struct vfsmount *,
+			struct autofs_sb_info *, int __user *);
+struct dentry *autofs_expire_direct(struct super_block *sb,
+				    struct vfsmount *mnt,
+				    struct autofs_sb_info *sbi, int how);
+struct dentry *autofs_expire_indirect(struct super_block *sb,
+				      struct vfsmount *mnt,
+				      struct autofs_sb_info *sbi, int how);
 
 /* Device node initialization */
 
@@ -168,11 +168,11 @@ void autofs_dev_ioctl_exit(void);
 
 /* Operations structures */
 
-extern const struct inode_operations autofs4_symlink_inode_operations;
-extern const struct inode_operations autofs4_dir_inode_operations;
-extern const struct file_operations autofs4_dir_operations;
-extern const struct file_operations autofs4_root_operations;
-extern const struct dentry_operations autofs4_dentry_operations;
+extern const struct inode_operations autofs_symlink_inode_operations;
+extern const struct inode_operations autofs_dir_inode_operations;
+extern const struct file_operations autofs_dir_operations;
+extern const struct file_operations autofs_root_operations;
+extern const struct dentry_operations autofs_dentry_operations;
 
 /* VFS automount flags management functions */
 static inline void __managed_dentry_set_managed(struct dentry *dentry)
@@ -201,9 +201,9 @@ static inline void managed_dentry_clear_managed(struct dentry *dentry)
 
 /* Initializing function */
 
-int autofs4_fill_super(struct super_block *, void *, int);
-struct autofs_info *autofs4_new_ino(struct autofs_sb_info *);
-void autofs4_clean_ino(struct autofs_info *);
+int autofs_fill_super(struct super_block *, void *, int);
+struct autofs_info *autofs_new_ino(struct autofs_sb_info *);
+void autofs_clean_ino(struct autofs_info *);
 
 static inline int autofs_prepare_pipe(struct file *pipe)
 {
@@ -218,25 +218,25 @@ static inline int autofs_prepare_pipe(struct file *pipe)
 
 /* Queue management functions */
 
-int autofs4_wait(struct autofs_sb_info *,
+int autofs_wait(struct autofs_sb_info *,
 		 const struct path *, enum autofs_notify);
-int autofs4_wait_release(struct autofs_sb_info *, autofs_wqt_t, int);
-void autofs4_catatonic_mode(struct autofs_sb_info *);
+int autofs_wait_release(struct autofs_sb_info *, autofs_wqt_t, int);
+void autofs_catatonic_mode(struct autofs_sb_info *);
 
-static inline u32 autofs4_get_dev(struct autofs_sb_info *sbi)
+static inline u32 autofs_get_dev(struct autofs_sb_info *sbi)
 {
 	return new_encode_dev(sbi->sb->s_dev);
 }
 
-static inline u64 autofs4_get_ino(struct autofs_sb_info *sbi)
+static inline u64 autofs_get_ino(struct autofs_sb_info *sbi)
 {
 	return d_inode(sbi->sb->s_root)->i_ino;
 }
 
-static inline void __autofs4_add_expiring(struct dentry *dentry)
+static inline void __autofs_add_expiring(struct dentry *dentry)
 {
-	struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
-	struct autofs_info *ino = autofs4_dentry_ino(dentry);
+	struct autofs_sb_info *sbi = autofs_sbi(dentry->d_sb);
+	struct autofs_info *ino = autofs_dentry_ino(dentry);
 
 	if (ino) {
 		if (list_empty(&ino->expiring))
@@ -244,10 +244,10 @@ static inline void __autofs4_add_expiring(struct dentry *dentry)
 	}
 }
 
-static inline void autofs4_add_expiring(struct dentry *dentry)
+static inline void autofs_add_expiring(struct dentry *dentry)
 {
-	struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
-	struct autofs_info *ino = autofs4_dentry_ino(dentry);
+	struct autofs_sb_info *sbi = autofs_sbi(dentry->d_sb);
+	struct autofs_info *ino = autofs_dentry_ino(dentry);
 
 	if (ino) {
 		spin_lock(&sbi->lookup_lock);
@@ -257,10 +257,10 @@ static inline void autofs4_add_expiring(struct dentry *dentry)
 	}
 }
 
-static inline void autofs4_del_expiring(struct dentry *dentry)
+static inline void autofs_del_expiring(struct dentry *dentry)
 {
-	struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
-	struct autofs_info *ino = autofs4_dentry_ino(dentry);
+	struct autofs_sb_info *sbi = autofs_sbi(dentry->d_sb);
+	struct autofs_info *ino = autofs_dentry_ino(dentry);
 
 	if (ino) {
 		spin_lock(&sbi->lookup_lock);
@@ -270,4 +270,4 @@ static inline void autofs4_del_expiring(struct dentry *dentry)
 	}
 }
 
-void autofs4_kill_sb(struct super_block *);
+void autofs_kill_sb(struct super_block *);
diff --git a/fs/autofs4/dev-ioctl.c b/fs/autofs/dev-ioctl.c
index 26f6b4f41ce6..ea4ca1445ab7 100644
--- a/fs/autofs4/dev-ioctl.c
+++ b/fs/autofs/dev-ioctl.c
@@ -7,23 +7,10 @@
  * option, any later version, incorporated herein by reference.
  */
 
-#include <linux/module.h>
-#include <linux/vmalloc.h>
 #include <linux/miscdevice.h>
-#include <linux/init.h>
-#include <linux/wait.h>
-#include <linux/namei.h>
-#include <linux/fcntl.h>
-#include <linux/file.h>
-#include <linux/fdtable.h>
-#include <linux/sched.h>
-#include <linux/cred.h>
 #include <linux/compat.h>
 #include <linux/syscalls.h>
 #include <linux/magic.h>
-#include <linux/dcache.h>
-#include <linux/uaccess.h>
-#include <linux/slab.h>
 
 #include "autofs_i.h"
 
@@ -166,7 +153,7 @@ static struct autofs_sb_info *autofs_dev_ioctl_sbi(struct file *f)
 
 	if (f) {
 		inode = file_inode(f);
-		sbi = autofs4_sbi(inode->i_sb);
+		sbi = autofs_sbi(inode->i_sb);
 	}
 	return sbi;
 }
@@ -236,7 +223,7 @@ static int test_by_dev(const struct path *path, void *p)
 
 static int test_by_type(const struct path *path, void *p)
 {
-	struct autofs_info *ino = autofs4_dentry_ino(path->dentry);
+	struct autofs_info *ino = autofs_dentry_ino(path->dentry);
 
 	return ino && ino->sbi->type & *(unsigned *)p;
 }
@@ -324,7 +311,7 @@ static int autofs_dev_ioctl_ready(struct file *fp,
 	autofs_wqt_t token;
 
 	token = (autofs_wqt_t) param->ready.token;
-	return autofs4_wait_release(sbi, token, 0);
+	return autofs_wait_release(sbi, token, 0);
 }
 
 /*
@@ -340,7 +327,7 @@ static int autofs_dev_ioctl_fail(struct file *fp,
 
 	token = (autofs_wqt_t) param->fail.token;
 	status = param->fail.status < 0 ? param->fail.status : -ENOENT;
-	return autofs4_wait_release(sbi, token, status);
+	return autofs_wait_release(sbi, token, status);
 }
 
 /*
@@ -412,7 +399,7 @@ static int autofs_dev_ioctl_catatonic(struct file *fp,
 				      struct autofs_sb_info *sbi,
 				      struct autofs_dev_ioctl *param)
 {
-	autofs4_catatonic_mode(sbi);
+	autofs_catatonic_mode(sbi);
 	return 0;
 }
 
@@ -459,10 +446,10 @@ static int autofs_dev_ioctl_requester(struct file *fp,
 	if (err)
 		goto out;
 
-	ino = autofs4_dentry_ino(path.dentry);
+	ino = autofs_dentry_ino(path.dentry);
 	if (ino) {
 		err = 0;
-		autofs4_expire_wait(&path, 0);
+		autofs_expire_wait(&path, 0);
 		spin_lock(&sbi->fs_lock);
 		param->requester.uid =
 			from_kuid_munged(current_user_ns(), ino->uid);
@@ -489,7 +476,7 @@ static int autofs_dev_ioctl_expire(struct file *fp,
 	how = param->expire.how;
 	mnt = fp->f_path.mnt;
 
-	return autofs4_do_expire_multi(sbi->sb, mnt, sbi, how);
+	return autofs_do_expire_multi(sbi->sb, mnt, sbi, how);
 }
 
 /* Check if autofs mount point is in use */
@@ -686,7 +673,7 @@ static int _autofs_dev_ioctl(unsigned int command,
 		 * Admin needs to be able to set the mount catatonic in
 		 * order to be able to perform the re-open.
 		 */
-		if (!autofs4_oz_mode(sbi) &&
+		if (!autofs_oz_mode(sbi) &&
 		    cmd != AUTOFS_DEV_IOCTL_CATATONIC_CMD) {
 			err = -EACCES;
 			fput(fp);
diff --git a/fs/autofs4/expire.c b/fs/autofs/expire.c
index 57725d4a8c59..b332d3f6e730 100644
--- a/fs/autofs4/expire.c
+++ b/fs/autofs/expire.c
@@ -13,10 +13,10 @@
 static unsigned long now;
 
 /* Check if a dentry can be expired */
-static inline int autofs4_can_expire(struct dentry *dentry,
-				     unsigned long timeout, int do_now)
+static inline int autofs_can_expire(struct dentry *dentry,
+				    unsigned long timeout, int do_now)
 {
-	struct autofs_info *ino = autofs4_dentry_ino(dentry);
+	struct autofs_info *ino = autofs_dentry_ino(dentry);
 
 	/* dentry in the process of being deleted */
 	if (ino == NULL)
@@ -31,7 +31,7 @@ static inline int autofs4_can_expire(struct dentry *dentry,
 }
 
 /* Check a mount point for busyness */
-static int autofs4_mount_busy(struct vfsmount *mnt, struct dentry *dentry)
+static int autofs_mount_busy(struct vfsmount *mnt, struct dentry *dentry)
 {
 	struct dentry *top = dentry;
 	struct path path = {.mnt = mnt, .dentry = dentry};
@@ -44,8 +44,8 @@ static int autofs4_mount_busy(struct vfsmount *mnt, struct dentry *dentry)
 	if (!follow_down_one(&path))
 		goto done;
 
-	if (is_autofs4_dentry(path.dentry)) {
-		struct autofs_sb_info *sbi = autofs4_sbi(path.dentry->d_sb);
+	if (is_autofs_dentry(path.dentry)) {
+		struct autofs_sb_info *sbi = autofs_sbi(path.dentry->d_sb);
 
 		/* This is an autofs submount, we can't expire it */
 		if (autofs_type_indirect(sbi->type))
@@ -56,7 +56,7 @@ static int autofs4_mount_busy(struct vfsmount *mnt, struct dentry *dentry)
 	if (!may_umount_tree(path.mnt)) {
 		struct autofs_info *ino;
 
-		ino = autofs4_dentry_ino(top);
+		ino = autofs_dentry_ino(top);
 		ino->last_used = jiffies;
 		goto done;
 	}
@@ -74,7 +74,7 @@ done:
 static struct dentry *get_next_positive_subdir(struct dentry *prev,
 					       struct dentry *root)
 {
-	struct autofs_sb_info *sbi = autofs4_sbi(root->d_sb);
+	struct autofs_sb_info *sbi = autofs_sbi(root->d_sb);
 	struct list_head *next;
 	struct dentry *q;
 
@@ -121,7 +121,7 @@ cont:
 static struct dentry *get_next_positive_dentry(struct dentry *prev,
 					       struct dentry *root)
 {
-	struct autofs_sb_info *sbi = autofs4_sbi(root->d_sb);
+	struct autofs_sb_info *sbi = autofs_sbi(root->d_sb);
 	struct list_head *next;
 	struct dentry *p, *ret;
 
@@ -184,10 +184,10 @@ again:
  * The tree is not busy iff no mountpoints are busy and there are no
  * autofs submounts.
  */
-static int autofs4_direct_busy(struct vfsmount *mnt,
-			       struct dentry *top,
-			       unsigned long timeout,
-			       int do_now)
+static int autofs_direct_busy(struct vfsmount *mnt,
+			      struct dentry *top,
+			      unsigned long timeout,
+			      int do_now)
 {
 	pr_debug("top %p %pd\n", top, top);
 
@@ -195,14 +195,14 @@ static int autofs4_direct_busy(struct vfsmount *mnt,
 	if (!may_umount_tree(mnt)) {
 		struct autofs_info *ino;
 
-		ino = autofs4_dentry_ino(top);
+		ino = autofs_dentry_ino(top);
 		if (ino)
 			ino->last_used = jiffies;
 		return 1;
 	}
 
 	/* Timeout of a direct mount is determined by its top dentry */
-	if (!autofs4_can_expire(top, timeout, do_now))
+	if (!autofs_can_expire(top, timeout, do_now))
 		return 1;
 
 	return 0;
@@ -212,12 +212,12 @@ static int autofs4_direct_busy(struct vfsmount *mnt,
  * Check a directory tree of mount points for busyness
  * The tree is not busy iff no mountpoints are busy
  */
-static int autofs4_tree_busy(struct vfsmount *mnt,
-	       		     struct dentry *top,
-			     unsigned long timeout,
-			     int do_now)
+static int autofs_tree_busy(struct vfsmount *mnt,
+			    struct dentry *top,
+			    unsigned long timeout,
+			    int do_now)
 {
-	struct autofs_info *top_ino = autofs4_dentry_ino(top);
+	struct autofs_info *top_ino = autofs_dentry_ino(top);
 	struct dentry *p;
 
 	pr_debug("top %p %pd\n", top, top);
@@ -237,13 +237,13 @@ static int autofs4_tree_busy(struct vfsmount *mnt,
 		 * If the fs is busy update the expiry counter.
 		 */
 		if (d_mountpoint(p)) {
-			if (autofs4_mount_busy(mnt, p)) {
+			if (autofs_mount_busy(mnt, p)) {
 				top_ino->last_used = jiffies;
 				dput(p);
 				return 1;
 			}
 		} else {
-			struct autofs_info *ino = autofs4_dentry_ino(p);
+			struct autofs_info *ino = autofs_dentry_ino(p);
 			unsigned int ino_count = atomic_read(&ino->count);
 
 			/* allow for dget above and top is already dgot */
@@ -261,16 +261,16 @@ static int autofs4_tree_busy(struct vfsmount *mnt,
 	}
 
 	/* Timeout of a tree mount is ultimately determined by its top dentry */
-	if (!autofs4_can_expire(top, timeout, do_now))
+	if (!autofs_can_expire(top, timeout, do_now))
 		return 1;
 
 	return 0;
 }
 
-static struct dentry *autofs4_check_leaves(struct vfsmount *mnt,
-					   struct dentry *parent,
-					   unsigned long timeout,
-					   int do_now)
+static struct dentry *autofs_check_leaves(struct vfsmount *mnt,
+					  struct dentry *parent,
+					  unsigned long timeout,
+					  int do_now)
 {
 	struct dentry *p;
 
@@ -282,11 +282,11 @@ static struct dentry *autofs4_check_leaves(struct vfsmount *mnt,
 
 		if (d_mountpoint(p)) {
 			/* Can we umount this guy */
-			if (autofs4_mount_busy(mnt, p))
+			if (autofs_mount_busy(mnt, p))
 				continue;
 
 			/* Can we expire this guy */
-			if (autofs4_can_expire(p, timeout, do_now))
+			if (autofs_can_expire(p, timeout, do_now))
 				return p;
 		}
 	}
@@ -294,10 +294,10 @@ static struct dentry *autofs4_check_leaves(struct vfsmount *mnt,
 }
 
 /* Check if we can expire a direct mount (possibly a tree) */
-struct dentry *autofs4_expire_direct(struct super_block *sb,
-				     struct vfsmount *mnt,
-				     struct autofs_sb_info *sbi,
-				     int how)
+struct dentry *autofs_expire_direct(struct super_block *sb,
+				    struct vfsmount *mnt,
+				    struct autofs_sb_info *sbi,
+				    int how)
 {
 	unsigned long timeout;
 	struct dentry *root = dget(sb->s_root);
@@ -310,9 +310,9 @@ struct dentry *autofs4_expire_direct(struct super_block *sb,
 	now = jiffies;
 	timeout = sbi->exp_timeout;
 
-	if (!autofs4_direct_busy(mnt, root, timeout, do_now)) {
+	if (!autofs_direct_busy(mnt, root, timeout, do_now)) {
 		spin_lock(&sbi->fs_lock);
-		ino = autofs4_dentry_ino(root);
+		ino = autofs_dentry_ino(root);
 		/* No point expiring a pending mount */
 		if (ino->flags & AUTOFS_INF_PENDING) {
 			spin_unlock(&sbi->fs_lock);
@@ -321,7 +321,7 @@ struct dentry *autofs4_expire_direct(struct super_block *sb,
 		ino->flags |= AUTOFS_INF_WANT_EXPIRE;
 		spin_unlock(&sbi->fs_lock);
 		synchronize_rcu();
-		if (!autofs4_direct_busy(mnt, root, timeout, do_now)) {
+		if (!autofs_direct_busy(mnt, root, timeout, do_now)) {
 			spin_lock(&sbi->fs_lock);
 			ino->flags |= AUTOFS_INF_EXPIRING;
 			init_completion(&ino->expire_complete);
@@ -350,7 +350,7 @@ static struct dentry *should_expire(struct dentry *dentry,
 {
 	int do_now = how & AUTOFS_EXP_IMMEDIATE;
 	int exp_leaves = how & AUTOFS_EXP_LEAVES;
-	struct autofs_info *ino = autofs4_dentry_ino(dentry);
+	struct autofs_info *ino = autofs_dentry_ino(dentry);
 	unsigned int ino_count;
 
 	/* No point expiring a pending mount */
@@ -367,11 +367,11 @@ static struct dentry *should_expire(struct dentry *dentry,
 		pr_debug("checking mountpoint %p %pd\n", dentry, dentry);
 
 		/* Can we umount this guy */
-		if (autofs4_mount_busy(mnt, dentry))
+		if (autofs_mount_busy(mnt, dentry))
 			return NULL;
 
 		/* Can we expire this guy */
-		if (autofs4_can_expire(dentry, timeout, do_now))
+		if (autofs_can_expire(dentry, timeout, do_now))
 			return dentry;
 		return NULL;
 	}
@@ -382,7 +382,7 @@ static struct dentry *should_expire(struct dentry *dentry,
 		 * A symlink can't be "busy" in the usual sense so
 		 * just check last used for expire timeout.
 		 */
-		if (autofs4_can_expire(dentry, timeout, do_now))
+		if (autofs_can_expire(dentry, timeout, do_now))
 			return dentry;
 		return NULL;
 	}
@@ -397,7 +397,7 @@ static struct dentry *should_expire(struct dentry *dentry,
 		if (d_count(dentry) > ino_count)
 			return NULL;
 
-		if (!autofs4_tree_busy(mnt, dentry, timeout, do_now))
+		if (!autofs_tree_busy(mnt, dentry, timeout, do_now))
 			return dentry;
 	/*
 	 * Case 3: pseudo direct mount, expire individual leaves
@@ -411,7 +411,7 @@ static struct dentry *should_expire(struct dentry *dentry,
 		if (d_count(dentry) > ino_count)
 			return NULL;
 
-		expired = autofs4_check_leaves(mnt, dentry, timeout, do_now);
+		expired = autofs_check_leaves(mnt, dentry, timeout, do_now);
 		if (expired) {
 			if (expired == dentry)
 				dput(dentry);
@@ -427,10 +427,10 @@ static struct dentry *should_expire(struct dentry *dentry,
  *  - it is unused by any user process
  *  - it has been unused for exp_timeout time
  */
-struct dentry *autofs4_expire_indirect(struct super_block *sb,
-				       struct vfsmount *mnt,
-				       struct autofs_sb_info *sbi,
-				       int how)
+struct dentry *autofs_expire_indirect(struct super_block *sb,
+				      struct vfsmount *mnt,
+				      struct autofs_sb_info *sbi,
+				      int how)
 {
 	unsigned long timeout;
 	struct dentry *root = sb->s_root;
@@ -450,7 +450,7 @@ struct dentry *autofs4_expire_indirect(struct super_block *sb,
 		int flags = how;
 
 		spin_lock(&sbi->fs_lock);
-		ino = autofs4_dentry_ino(dentry);
+		ino = autofs_dentry_ino(dentry);
 		if (ino->flags & AUTOFS_INF_WANT_EXPIRE) {
 			spin_unlock(&sbi->fs_lock);
 			continue;
@@ -462,7 +462,7 @@ struct dentry *autofs4_expire_indirect(struct super_block *sb,
 			continue;
 
 		spin_lock(&sbi->fs_lock);
-		ino = autofs4_dentry_ino(expired);
+		ino = autofs_dentry_ino(expired);
 		ino->flags |= AUTOFS_INF_WANT_EXPIRE;
 		spin_unlock(&sbi->fs_lock);
 		synchronize_rcu();
@@ -498,11 +498,11 @@ found:
 	return expired;
 }
 
-int autofs4_expire_wait(const struct path *path, int rcu_walk)
+int autofs_expire_wait(const struct path *path, int rcu_walk)
 {
 	struct dentry *dentry = path->dentry;
-	struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
-	struct autofs_info *ino = autofs4_dentry_ino(dentry);
+	struct autofs_sb_info *sbi = autofs_sbi(dentry->d_sb);
+	struct autofs_info *ino = autofs_dentry_ino(dentry);
 	int status;
 	int state;
 
@@ -529,7 +529,7 @@ retry:
 
 		pr_debug("waiting for expire %p name=%pd\n", dentry, dentry);
 
-		status = autofs4_wait(sbi, path, NFY_NONE);
+		status = autofs_wait(sbi, path, NFY_NONE);
 		wait_for_completion(&ino->expire_complete);
 
 		pr_debug("expire done status=%d\n", status);
@@ -545,10 +545,10 @@ retry:
 }
 
 /* Perform an expiry operation */
-int autofs4_expire_run(struct super_block *sb,
-		       struct vfsmount *mnt,
-		       struct autofs_sb_info *sbi,
-		       struct autofs_packet_expire __user *pkt_p)
+int autofs_expire_run(struct super_block *sb,
+		      struct vfsmount *mnt,
+		      struct autofs_sb_info *sbi,
+		      struct autofs_packet_expire __user *pkt_p)
 {
 	struct autofs_packet_expire pkt;
 	struct autofs_info *ino;
@@ -560,7 +560,7 @@ int autofs4_expire_run(struct super_block *sb,
 	pkt.hdr.proto_version = sbi->version;
 	pkt.hdr.type = autofs_ptype_expire;
 
-	dentry = autofs4_expire_indirect(sb, mnt, sbi, 0);
+	dentry = autofs_expire_indirect(sb, mnt, sbi, 0);
 	if (!dentry)
 		return -EAGAIN;
 
@@ -573,7 +573,7 @@ int autofs4_expire_run(struct super_block *sb,
 		ret = -EFAULT;
 
 	spin_lock(&sbi->fs_lock);
-	ino = autofs4_dentry_ino(dentry);
+	ino = autofs_dentry_ino(dentry);
 	/* avoid rapid-fire expire attempts if expiry fails */
 	ino->last_used = now;
 	ino->flags &= ~(AUTOFS_INF_EXPIRING|AUTOFS_INF_WANT_EXPIRE);
@@ -583,25 +583,25 @@ int autofs4_expire_run(struct super_block *sb,
 	return ret;
 }
 
-int autofs4_do_expire_multi(struct super_block *sb, struct vfsmount *mnt,
-			    struct autofs_sb_info *sbi, int when)
+int autofs_do_expire_multi(struct super_block *sb, struct vfsmount *mnt,
+			   struct autofs_sb_info *sbi, int when)
 {
 	struct dentry *dentry;
 	int ret = -EAGAIN;
 
 	if (autofs_type_trigger(sbi->type))
-		dentry = autofs4_expire_direct(sb, mnt, sbi, when);
+		dentry = autofs_expire_direct(sb, mnt, sbi, when);
 	else
-		dentry = autofs4_expire_indirect(sb, mnt, sbi, when);
+		dentry = autofs_expire_indirect(sb, mnt, sbi, when);
 
 	if (dentry) {
-		struct autofs_info *ino = autofs4_dentry_ino(dentry);
+		struct autofs_info *ino = autofs_dentry_ino(dentry);
 		const struct path path = { .mnt = mnt, .dentry = dentry };
 
 		/* This is synchronous because it makes the daemon a
 		 * little easier
 		 */
-		ret = autofs4_wait(sbi, &path, NFY_EXPIRE);
+		ret = autofs_wait(sbi, &path, NFY_EXPIRE);
 
 		spin_lock(&sbi->fs_lock);
 		/* avoid rapid-fire expire attempts if expiry fails */
@@ -619,7 +619,7 @@ int autofs4_do_expire_multi(struct super_block *sb, struct vfsmount *mnt,
  * Call repeatedly until it returns -EAGAIN, meaning there's nothing
  * more to be done.
  */
-int autofs4_expire_multi(struct super_block *sb, struct vfsmount *mnt,
+int autofs_expire_multi(struct super_block *sb, struct vfsmount *mnt,
 			struct autofs_sb_info *sbi, int __user *arg)
 {
 	int do_now = 0;
@@ -627,6 +627,5 @@ int autofs4_expire_multi(struct super_block *sb, struct vfsmount *mnt,
 	if (arg && get_user(do_now, arg))
 		return -EFAULT;
 
-	return autofs4_do_expire_multi(sb, mnt, sbi, do_now);
+	return autofs_do_expire_multi(sb, mnt, sbi, do_now);
 }
-
diff --git a/fs/autofs4/init.c b/fs/autofs/init.c
index 8cf0e63389ae..16fb61315843 100644
--- a/fs/autofs4/init.c
+++ b/fs/autofs/init.c
@@ -13,18 +13,18 @@
 static struct dentry *autofs_mount(struct file_system_type *fs_type,
 	int flags, const char *dev_name, void *data)
 {
-	return mount_nodev(fs_type, flags, data, autofs4_fill_super);
+	return mount_nodev(fs_type, flags, data, autofs_fill_super);
 }
 
 static struct file_system_type autofs_fs_type = {
 	.owner		= THIS_MODULE,
 	.name		= "autofs",
 	.mount		= autofs_mount,
-	.kill_sb	= autofs4_kill_sb,
+	.kill_sb	= autofs_kill_sb,
 };
 MODULE_ALIAS_FS("autofs");
 
-static int __init init_autofs4_fs(void)
+static int __init init_autofs_fs(void)
 {
 	int err;
 
@@ -37,12 +37,12 @@ static int __init init_autofs4_fs(void)
 	return err;
 }
 
-static void __exit exit_autofs4_fs(void)
+static void __exit exit_autofs_fs(void)
 {
 	autofs_dev_ioctl_exit();
 	unregister_filesystem(&autofs_fs_type);
 }
 
-module_init(init_autofs4_fs) 
-module_exit(exit_autofs4_fs)
+module_init(init_autofs_fs)
+module_exit(exit_autofs_fs)
 MODULE_LICENSE("GPL");
diff --git a/fs/autofs4/inode.c b/fs/autofs/inode.c
index 09e7d68dff02..b51980fc274e 100644
--- a/fs/autofs4/inode.c
+++ b/fs/autofs/inode.c
@@ -7,18 +7,14 @@
  * option, any later version, incorporated herein by reference.
  */
 
-#include <linux/kernel.h>
-#include <linux/slab.h>
-#include <linux/file.h>
 #include <linux/seq_file.h>
 #include <linux/pagemap.h>
 #include <linux/parser.h>
-#include <linux/bitops.h>
 #include <linux/magic.h>
+
 #include "autofs_i.h"
-#include <linux/module.h>
 
-struct autofs_info *autofs4_new_ino(struct autofs_sb_info *sbi)
+struct autofs_info *autofs_new_ino(struct autofs_sb_info *sbi)
 {
 	struct autofs_info *ino;
 
@@ -32,21 +28,21 @@ struct autofs_info *autofs4_new_ino(struct autofs_sb_info *sbi)
 	return ino;
 }
 
-void autofs4_clean_ino(struct autofs_info *ino)
+void autofs_clean_ino(struct autofs_info *ino)
 {
 	ino->uid = GLOBAL_ROOT_UID;
 	ino->gid = GLOBAL_ROOT_GID;
 	ino->last_used = jiffies;
 }
 
-void autofs4_free_ino(struct autofs_info *ino)
+void autofs_free_ino(struct autofs_info *ino)
 {
 	kfree(ino);
 }
 
-void autofs4_kill_sb(struct super_block *sb)
+void autofs_kill_sb(struct super_block *sb)
 {
-	struct autofs_sb_info *sbi = autofs4_sbi(sb);
+	struct autofs_sb_info *sbi = autofs_sbi(sb);
 
 	/*
 	 * In the event of a failure in get_sb_nodev the superblock
@@ -56,7 +52,7 @@ void autofs4_kill_sb(struct super_block *sb)
 	 */
 	if (sbi) {
 		/* Free wait queues, close pipe */
-		autofs4_catatonic_mode(sbi);
+		autofs_catatonic_mode(sbi);
 		put_pid(sbi->oz_pgrp);
 	}
 
@@ -66,9 +62,9 @@ void autofs4_kill_sb(struct super_block *sb)
 		kfree_rcu(sbi, rcu);
 }
 
-static int autofs4_show_options(struct seq_file *m, struct dentry *root)
+static int autofs_show_options(struct seq_file *m, struct dentry *root)
 {
-	struct autofs_sb_info *sbi = autofs4_sbi(root->d_sb);
+	struct autofs_sb_info *sbi = autofs_sbi(root->d_sb);
 	struct inode *root_inode = d_inode(root->d_sb->s_root);
 
 	if (!sbi)
@@ -101,16 +97,16 @@ static int autofs4_show_options(struct seq_file *m, struct dentry *root)
 	return 0;
 }
 
-static void autofs4_evict_inode(struct inode *inode)
+static void autofs_evict_inode(struct inode *inode)
 {
 	clear_inode(inode);
 	kfree(inode->i_private);
 }
 
-static const struct super_operations autofs4_sops = {
+static const struct super_operations autofs_sops = {
 	.statfs		= simple_statfs,
-	.show_options	= autofs4_show_options,
-	.evict_inode	= autofs4_evict_inode,
+	.show_options	= autofs_show_options,
+	.evict_inode	= autofs_evict_inode,
 };
 
 enum {Opt_err, Opt_fd, Opt_uid, Opt_gid, Opt_pgrp, Opt_minproto, Opt_maxproto,
@@ -206,7 +202,7 @@ static int parse_options(char *options, int *pipefd, kuid_t *uid, kgid_t *gid,
 	return (*pipefd < 0);
 }
 
-int autofs4_fill_super(struct super_block *s, void *data, int silent)
+int autofs_fill_super(struct super_block *s, void *data, int silent)
 {
 	struct inode *root_inode;
 	struct dentry *root;
@@ -246,19 +242,19 @@ int autofs4_fill_super(struct super_block *s, void *data, int silent)
 	s->s_blocksize = 1024;
 	s->s_blocksize_bits = 10;
 	s->s_magic = AUTOFS_SUPER_MAGIC;
-	s->s_op = &autofs4_sops;
-	s->s_d_op = &autofs4_dentry_operations;
+	s->s_op = &autofs_sops;
+	s->s_d_op = &autofs_dentry_operations;
 	s->s_time_gran = 1;
 
 	/*
 	 * Get the root inode and dentry, but defer checking for errors.
 	 */
-	ino = autofs4_new_ino(sbi);
+	ino = autofs_new_ino(sbi);
 	if (!ino) {
 		ret = -ENOMEM;
 		goto fail_free;
 	}
-	root_inode = autofs4_get_inode(s, S_IFDIR | 0755);
+	root_inode = autofs_get_inode(s, S_IFDIR | 0755);
 	root = d_make_root(root_inode);
 	if (!root)
 		goto fail_ino;
@@ -305,8 +301,8 @@ int autofs4_fill_super(struct super_block *s, void *data, int silent)
 	if (autofs_type_trigger(sbi->type))
 		__managed_dentry_set_managed(root);
 
-	root_inode->i_fop = &autofs4_root_operations;
-	root_inode->i_op = &autofs4_dir_inode_operations;
+	root_inode->i_fop = &autofs_root_operations;
+	root_inode->i_op = &autofs_dir_inode_operations;
 
 	pr_debug("pipe fd = %d, pgrp = %u\n", pipefd, pid_nr(sbi->oz_pgrp));
 	pipe = fget(pipefd);
@@ -340,14 +336,14 @@ fail_dput:
 	dput(root);
 	goto fail_free;
 fail_ino:
-	autofs4_free_ino(ino);
+	autofs_free_ino(ino);
 fail_free:
 	kfree(sbi);
 	s->s_fs_info = NULL;
 	return ret;
 }
 
-struct inode *autofs4_get_inode(struct super_block *sb, umode_t mode)
+struct inode *autofs_get_inode(struct super_block *sb, umode_t mode)
 {
 	struct inode *inode = new_inode(sb);
 
@@ -364,10 +360,10 @@ struct inode *autofs4_get_inode(struct super_block *sb, umode_t mode)
 
 	if (S_ISDIR(mode)) {
 		set_nlink(inode, 2);
-		inode->i_op = &autofs4_dir_inode_operations;
-		inode->i_fop = &autofs4_dir_operations;
+		inode->i_op = &autofs_dir_inode_operations;
+		inode->i_fop = &autofs_dir_operations;
 	} else if (S_ISLNK(mode)) {
-		inode->i_op = &autofs4_symlink_inode_operations;
+		inode->i_op = &autofs_symlink_inode_operations;
 	} else
 		WARN_ON(1);
 
diff --git a/fs/autofs4/root.c b/fs/autofs/root.c
index b12e37f27530..a3d414150578 100644
--- a/fs/autofs4/root.c
+++ b/fs/autofs/root.c
@@ -9,72 +9,66 @@
  */
 
 #include <linux/capability.h>
-#include <linux/errno.h>
-#include <linux/stat.h>
-#include <linux/slab.h>
-#include <linux/param.h>
-#include <linux/time.h>
 #include <linux/compat.h>
-#include <linux/mutex.h>
 
 #include "autofs_i.h"
 
-static int autofs4_dir_symlink(struct inode *, struct dentry *, const char *);
-static int autofs4_dir_unlink(struct inode *, struct dentry *);
-static int autofs4_dir_rmdir(struct inode *, struct dentry *);
-static int autofs4_dir_mkdir(struct inode *, struct dentry *, umode_t);
-static long autofs4_root_ioctl(struct file *, unsigned int, unsigned long);
+static int autofs_dir_symlink(struct inode *, struct dentry *, const char *);
+static int autofs_dir_unlink(struct inode *, struct dentry *);
+static int autofs_dir_rmdir(struct inode *, struct dentry *);
+static int autofs_dir_mkdir(struct inode *, struct dentry *, umode_t);
+static long autofs_root_ioctl(struct file *, unsigned int, unsigned long);
 #ifdef CONFIG_COMPAT
-static long autofs4_root_compat_ioctl(struct file *,
-				      unsigned int, unsigned long);
+static long autofs_root_compat_ioctl(struct file *,
+				     unsigned int, unsigned long);
 #endif
-static int autofs4_dir_open(struct inode *inode, struct file *file);
-static struct dentry *autofs4_lookup(struct inode *,
-				     struct dentry *, unsigned int);
-static struct vfsmount *autofs4_d_automount(struct path *);
-static int autofs4_d_manage(const struct path *, bool);
-static void autofs4_dentry_release(struct dentry *);
-
-const struct file_operations autofs4_root_operations = {
+static int autofs_dir_open(struct inode *inode, struct file *file);
+static struct dentry *autofs_lookup(struct inode *,
+				    struct dentry *, unsigned int);
+static struct vfsmount *autofs_d_automount(struct path *);
+static int autofs_d_manage(const struct path *, bool);
+static void autofs_dentry_release(struct dentry *);
+
+const struct file_operations autofs_root_operations = {
 	.open		= dcache_dir_open,
 	.release	= dcache_dir_close,
 	.read		= generic_read_dir,
 	.iterate_shared	= dcache_readdir,
 	.llseek		= dcache_dir_lseek,
-	.unlocked_ioctl	= autofs4_root_ioctl,
+	.unlocked_ioctl	= autofs_root_ioctl,
 #ifdef CONFIG_COMPAT
-	.compat_ioctl	= autofs4_root_compat_ioctl,
+	.compat_ioctl	= autofs_root_compat_ioctl,
 #endif
 };
 
-const struct file_operations autofs4_dir_operations = {
-	.open		= autofs4_dir_open,
+const struct file_operations autofs_dir_operations = {
+	.open		= autofs_dir_open,
 	.release	= dcache_dir_close,
 	.read		= generic_read_dir,
 	.iterate_shared	= dcache_readdir,
 	.llseek		= dcache_dir_lseek,
 };
 
-const struct inode_operations autofs4_dir_inode_operations = {
-	.lookup		= autofs4_lookup,
-	.unlink		= autofs4_dir_unlink,
-	.symlink	= autofs4_dir_symlink,
-	.mkdir		= autofs4_dir_mkdir,
-	.rmdir		= autofs4_dir_rmdir,
+const struct inode_operations autofs_dir_inode_operations = {
+	.lookup		= autofs_lookup,
+	.unlink		= autofs_dir_unlink,
+	.symlink	= autofs_dir_symlink,
+	.mkdir		= autofs_dir_mkdir,
+	.rmdir		= autofs_dir_rmdir,
 };
 
-const struct dentry_operations autofs4_dentry_operations = {
-	.d_automount	= autofs4_d_automount,
-	.d_manage	= autofs4_d_manage,
-	.d_release	= autofs4_dentry_release,
+const struct dentry_operations autofs_dentry_operations = {
+	.d_automount	= autofs_d_automount,
+	.d_manage	= autofs_d_manage,
+	.d_release	= autofs_dentry_release,
 };
 
-static void autofs4_add_active(struct dentry *dentry)
+static void autofs_add_active(struct dentry *dentry)
 {
-	struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
+	struct autofs_sb_info *sbi = autofs_sbi(dentry->d_sb);
 	struct autofs_info *ino;
 
-	ino = autofs4_dentry_ino(dentry);
+	ino = autofs_dentry_ino(dentry);
 	if (ino) {
 		spin_lock(&sbi->lookup_lock);
 		if (!ino->active_count) {
@@ -86,12 +80,12 @@ static void autofs4_add_active(struct dentry *dentry)
 	}
 }
 
-static void autofs4_del_active(struct dentry *dentry)
+static void autofs_del_active(struct dentry *dentry)
 {
-	struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
+	struct autofs_sb_info *sbi = autofs_sbi(dentry->d_sb);
 	struct autofs_info *ino;
 
-	ino = autofs4_dentry_ino(dentry);
+	ino = autofs_dentry_ino(dentry);
 	if (ino) {
 		spin_lock(&sbi->lookup_lock);
 		ino->active_count--;
@@ -103,14 +97,14 @@ static void autofs4_del_active(struct dentry *dentry)
 	}
 }
 
-static int autofs4_dir_open(struct inode *inode, struct file *file)
+static int autofs_dir_open(struct inode *inode, struct file *file)
 {
 	struct dentry *dentry = file->f_path.dentry;
-	struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
+	struct autofs_sb_info *sbi = autofs_sbi(dentry->d_sb);
 
 	pr_debug("file=%p dentry=%p %pd\n", file, dentry, dentry);
 
-	if (autofs4_oz_mode(sbi))
+	if (autofs_oz_mode(sbi))
 		goto out;
 
 	/*
@@ -133,10 +127,10 @@ out:
 	return dcache_dir_open(inode, file);
 }
 
-static void autofs4_dentry_release(struct dentry *de)
+static void autofs_dentry_release(struct dentry *de)
 {
-	struct autofs_info *ino = autofs4_dentry_ino(de);
-	struct autofs_sb_info *sbi = autofs4_sbi(de->d_sb);
+	struct autofs_info *ino = autofs_dentry_ino(de);
+	struct autofs_sb_info *sbi = autofs_sbi(de->d_sb);
 
 	pr_debug("releasing %p\n", de);
 
@@ -152,12 +146,12 @@ static void autofs4_dentry_release(struct dentry *de)
 		spin_unlock(&sbi->lookup_lock);
 	}
 
-	autofs4_free_ino(ino);
+	autofs_free_ino(ino);
 }
 
-static struct dentry *autofs4_lookup_active(struct dentry *dentry)
+static struct dentry *autofs_lookup_active(struct dentry *dentry)
 {
-	struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
+	struct autofs_sb_info *sbi = autofs_sbi(dentry->d_sb);
 	struct dentry *parent = dentry->d_parent;
 	const struct qstr *name = &dentry->d_name;
 	unsigned int len = name->len;
@@ -209,10 +203,10 @@ next:
 	return NULL;
 }
 
-static struct dentry *autofs4_lookup_expiring(struct dentry *dentry,
-					      bool rcu_walk)
+static struct dentry *autofs_lookup_expiring(struct dentry *dentry,
+					     bool rcu_walk)
 {
-	struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
+	struct autofs_sb_info *sbi = autofs_sbi(dentry->d_sb);
 	struct dentry *parent = dentry->d_parent;
 	const struct qstr *name = &dentry->d_name;
 	unsigned int len = name->len;
@@ -269,17 +263,17 @@ next:
 	return NULL;
 }
 
-static int autofs4_mount_wait(const struct path *path, bool rcu_walk)
+static int autofs_mount_wait(const struct path *path, bool rcu_walk)
 {
-	struct autofs_sb_info *sbi = autofs4_sbi(path->dentry->d_sb);
-	struct autofs_info *ino = autofs4_dentry_ino(path->dentry);
+	struct autofs_sb_info *sbi = autofs_sbi(path->dentry->d_sb);
+	struct autofs_info *ino = autofs_dentry_ino(path->dentry);
 	int status = 0;
 
 	if (ino->flags & AUTOFS_INF_PENDING) {
 		if (rcu_walk)
 			return -ECHILD;
 		pr_debug("waiting for mount name=%pd\n", path->dentry);
-		status = autofs4_wait(sbi, path, NFY_MOUNT);
+		status = autofs_wait(sbi, path, NFY_MOUNT);
 		pr_debug("mount wait done status=%d\n", status);
 	}
 	ino->last_used = jiffies;
@@ -291,11 +285,11 @@ static int do_expire_wait(const struct path *path, bool rcu_walk)
 	struct dentry *dentry = path->dentry;
 	struct dentry *expiring;
 
-	expiring = autofs4_lookup_expiring(dentry, rcu_walk);
+	expiring = autofs_lookup_expiring(dentry, rcu_walk);
 	if (IS_ERR(expiring))
 		return PTR_ERR(expiring);
 	if (!expiring)
-		return autofs4_expire_wait(path, rcu_walk);
+		return autofs_expire_wait(path, rcu_walk);
 	else {
 		const struct path this = { .mnt = path->mnt, .dentry = expiring };
 		/*
@@ -303,17 +297,17 @@ static int do_expire_wait(const struct path *path, bool rcu_walk)
 		 * be quite complete, but the directory has been removed
 		 * so it must have been successful, just wait for it.
 		 */
-		autofs4_expire_wait(&this, 0);
-		autofs4_del_expiring(expiring);
+		autofs_expire_wait(&this, 0);
+		autofs_del_expiring(expiring);
 		dput(expiring);
 	}
 	return 0;
 }
 
-static struct dentry *autofs4_mountpoint_changed(struct path *path)
+static struct dentry *autofs_mountpoint_changed(struct path *path)
 {
 	struct dentry *dentry = path->dentry;
-	struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
+	struct autofs_sb_info *sbi = autofs_sbi(dentry->d_sb);
 
 	/*
 	 * If this is an indirect mount the dentry could have gone away
@@ -327,7 +321,7 @@ static struct dentry *autofs4_mountpoint_changed(struct path *path)
 		new = d_lookup(parent, &dentry->d_name);
 		if (!new)
 			return NULL;
-		ino = autofs4_dentry_ino(new);
+		ino = autofs_dentry_ino(new);
 		ino->last_used = jiffies;
 		dput(path->dentry);
 		path->dentry = new;
@@ -335,17 +329,17 @@ static struct dentry *autofs4_mountpoint_changed(struct path *path)
 	return path->dentry;
 }
 
-static struct vfsmount *autofs4_d_automount(struct path *path)
+static struct vfsmount *autofs_d_automount(struct path *path)
 {
 	struct dentry *dentry = path->dentry;
-	struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
-	struct autofs_info *ino = autofs4_dentry_ino(dentry);
+	struct autofs_sb_info *sbi = autofs_sbi(dentry->d_sb);
+	struct autofs_info *ino = autofs_dentry_ino(dentry);
 	int status;
 
 	pr_debug("dentry=%p %pd\n", dentry, dentry);
 
 	/* The daemon never triggers a mount. */
-	if (autofs4_oz_mode(sbi))
+	if (autofs_oz_mode(sbi))
 		return NULL;
 
 	/*
@@ -364,7 +358,7 @@ static struct vfsmount *autofs4_d_automount(struct path *path)
 	spin_lock(&sbi->fs_lock);
 	if (ino->flags & AUTOFS_INF_PENDING) {
 		spin_unlock(&sbi->fs_lock);
-		status = autofs4_mount_wait(path, 0);
+		status = autofs_mount_wait(path, 0);
 		if (status)
 			return ERR_PTR(status);
 		goto done;
@@ -405,7 +399,7 @@ static struct vfsmount *autofs4_d_automount(struct path *path)
 		}
 		ino->flags |= AUTOFS_INF_PENDING;
 		spin_unlock(&sbi->fs_lock);
-		status = autofs4_mount_wait(path, 0);
+		status = autofs_mount_wait(path, 0);
 		spin_lock(&sbi->fs_lock);
 		ino->flags &= ~AUTOFS_INF_PENDING;
 		if (status) {
@@ -416,24 +410,24 @@ static struct vfsmount *autofs4_d_automount(struct path *path)
 	spin_unlock(&sbi->fs_lock);
 done:
 	/* Mount succeeded, check if we ended up with a new dentry */
-	dentry = autofs4_mountpoint_changed(path);
+	dentry = autofs_mountpoint_changed(path);
 	if (!dentry)
 		return ERR_PTR(-ENOENT);
 
 	return NULL;
 }
 
-static int autofs4_d_manage(const struct path *path, bool rcu_walk)
+static int autofs_d_manage(const struct path *path, bool rcu_walk)
 {
 	struct dentry *dentry = path->dentry;
-	struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
-	struct autofs_info *ino = autofs4_dentry_ino(dentry);
+	struct autofs_sb_info *sbi = autofs_sbi(dentry->d_sb);
+	struct autofs_info *ino = autofs_dentry_ino(dentry);
 	int status;
 
 	pr_debug("dentry=%p %pd\n", dentry, dentry);
 
 	/* The daemon never waits. */
-	if (autofs4_oz_mode(sbi)) {
+	if (autofs_oz_mode(sbi)) {
 		if (!path_is_mountpoint(path))
 			return -EISDIR;
 		return 0;
@@ -447,7 +441,7 @@ static int autofs4_d_manage(const struct path *path, bool rcu_walk)
 	 * This dentry may be under construction so wait on mount
 	 * completion.
 	 */
-	status = autofs4_mount_wait(path, rcu_walk);
+	status = autofs_mount_wait(path, rcu_walk);
 	if (status)
 		return status;
 
@@ -500,8 +494,8 @@ static int autofs4_d_manage(const struct path *path, bool rcu_walk)
 }
 
 /* Lookups in the root directory */
-static struct dentry *autofs4_lookup(struct inode *dir,
-				     struct dentry *dentry, unsigned int flags)
+static struct dentry *autofs_lookup(struct inode *dir,
+				    struct dentry *dentry, unsigned int flags)
 {
 	struct autofs_sb_info *sbi;
 	struct autofs_info *ino;
@@ -513,13 +507,13 @@ static struct dentry *autofs4_lookup(struct inode *dir,
 	if (dentry->d_name.len > NAME_MAX)
 		return ERR_PTR(-ENAMETOOLONG);
 
-	sbi = autofs4_sbi(dir->i_sb);
+	sbi = autofs_sbi(dir->i_sb);
 
 	pr_debug("pid = %u, pgrp = %u, catatonic = %d, oz_mode = %d\n",
 		 current->pid, task_pgrp_nr(current), sbi->catatonic,
-		 autofs4_oz_mode(sbi));
+		 autofs_oz_mode(sbi));
 
-	active = autofs4_lookup_active(dentry);
+	active = autofs_lookup_active(dentry);
 	if (active)
 		return active;
 	else {
@@ -529,7 +523,7 @@ static struct dentry *autofs4_lookup(struct inode *dir,
 		 * can return fail immediately.  The daemon however does need
 		 * to create directories within the file system.
 		 */
-		if (!autofs4_oz_mode(sbi) && !IS_ROOT(dentry->d_parent))
+		if (!autofs_oz_mode(sbi) && !IS_ROOT(dentry->d_parent))
 			return ERR_PTR(-ENOENT);
 
 		/* Mark entries in the root as mount triggers */
@@ -537,24 +531,24 @@ static struct dentry *autofs4_lookup(struct inode *dir,
 		    autofs_type_indirect(sbi->type))
 			__managed_dentry_set_managed(dentry);
 
-		ino = autofs4_new_ino(sbi);
+		ino = autofs_new_ino(sbi);
 		if (!ino)
 			return ERR_PTR(-ENOMEM);
 
 		dentry->d_fsdata = ino;
 		ino->dentry = dentry;
 
-		autofs4_add_active(dentry);
+		autofs_add_active(dentry);
 	}
 	return NULL;
 }
 
-static int autofs4_dir_symlink(struct inode *dir, 
+static int autofs_dir_symlink(struct inode *dir,
 			       struct dentry *dentry,
 			       const char *symname)
 {
-	struct autofs_sb_info *sbi = autofs4_sbi(dir->i_sb);
-	struct autofs_info *ino = autofs4_dentry_ino(dentry);
+	struct autofs_sb_info *sbi = autofs_sbi(dir->i_sb);
+	struct autofs_info *ino = autofs_dentry_ino(dentry);
 	struct autofs_info *p_ino;
 	struct inode *inode;
 	size_t size = strlen(symname);
@@ -562,14 +556,14 @@ static int autofs4_dir_symlink(struct inode *dir,
 
 	pr_debug("%s <- %pd\n", symname, dentry);
 
-	if (!autofs4_oz_mode(sbi))
+	if (!autofs_oz_mode(sbi))
 		return -EACCES;
 
 	BUG_ON(!ino);
 
-	autofs4_clean_ino(ino);
+	autofs_clean_ino(ino);
 
-	autofs4_del_active(dentry);
+	autofs_del_active(dentry);
 
 	cp = kmalloc(size + 1, GFP_KERNEL);
 	if (!cp)
@@ -577,7 +571,7 @@ static int autofs4_dir_symlink(struct inode *dir,
 
 	strcpy(cp, symname);
 
-	inode = autofs4_get_inode(dir->i_sb, S_IFLNK | 0555);
+	inode = autofs_get_inode(dir->i_sb, S_IFLNK | 0555);
 	if (!inode) {
 		kfree(cp);
 		return -ENOMEM;
@@ -588,7 +582,7 @@ static int autofs4_dir_symlink(struct inode *dir,
 
 	dget(dentry);
 	atomic_inc(&ino->count);
-	p_ino = autofs4_dentry_ino(dentry->d_parent);
+	p_ino = autofs_dentry_ino(dentry->d_parent);
 	if (p_ino && !IS_ROOT(dentry))
 		atomic_inc(&p_ino->count);
 
@@ -610,20 +604,20 @@ static int autofs4_dir_symlink(struct inode *dir,
  * If a process is blocked on the dentry waiting for the expire to finish,
  * it will invalidate the dentry and try to mount with a new one.
  *
- * Also see autofs4_dir_rmdir()..
+ * Also see autofs_dir_rmdir()..
  */
-static int autofs4_dir_unlink(struct inode *dir, struct dentry *dentry)
+static int autofs_dir_unlink(struct inode *dir, struct dentry *dentry)
 {
-	struct autofs_sb_info *sbi = autofs4_sbi(dir->i_sb);
-	struct autofs_info *ino = autofs4_dentry_ino(dentry);
+	struct autofs_sb_info *sbi = autofs_sbi(dir->i_sb);
+	struct autofs_info *ino = autofs_dentry_ino(dentry);
 	struct autofs_info *p_ino;
 
 	/* This allows root to remove symlinks */
-	if (!autofs4_oz_mode(sbi) && !capable(CAP_SYS_ADMIN))
+	if (!autofs_oz_mode(sbi) && !capable(CAP_SYS_ADMIN))
 		return -EPERM;
 
 	if (atomic_dec_and_test(&ino->count)) {
-		p_ino = autofs4_dentry_ino(dentry->d_parent);
+		p_ino = autofs_dentry_ino(dentry->d_parent);
 		if (p_ino && !IS_ROOT(dentry))
 			atomic_dec(&p_ino->count);
 	}
@@ -635,7 +629,7 @@ static int autofs4_dir_unlink(struct inode *dir, struct dentry *dentry)
 	dir->i_mtime = current_time(dir);
 
 	spin_lock(&sbi->lookup_lock);
-	__autofs4_add_expiring(dentry);
+	__autofs_add_expiring(dentry);
 	d_drop(dentry);
 	spin_unlock(&sbi->lookup_lock);
 
@@ -692,15 +686,15 @@ static void autofs_clear_leaf_automount_flags(struct dentry *dentry)
 		managed_dentry_set_managed(parent);
 }
 
-static int autofs4_dir_rmdir(struct inode *dir, struct dentry *dentry)
+static int autofs_dir_rmdir(struct inode *dir, struct dentry *dentry)
 {
-	struct autofs_sb_info *sbi = autofs4_sbi(dir->i_sb);
-	struct autofs_info *ino = autofs4_dentry_ino(dentry);
+	struct autofs_sb_info *sbi = autofs_sbi(dir->i_sb);
+	struct autofs_info *ino = autofs_dentry_ino(dentry);
 	struct autofs_info *p_ino;
 
 	pr_debug("dentry %p, removing %pd\n", dentry, dentry);
 
-	if (!autofs4_oz_mode(sbi))
+	if (!autofs_oz_mode(sbi))
 		return -EACCES;
 
 	spin_lock(&sbi->lookup_lock);
@@ -708,7 +702,7 @@ static int autofs4_dir_rmdir(struct inode *dir, struct dentry *dentry)
 		spin_unlock(&sbi->lookup_lock);
 		return -ENOTEMPTY;
 	}
-	__autofs4_add_expiring(dentry);
+	__autofs_add_expiring(dentry);
 	d_drop(dentry);
 	spin_unlock(&sbi->lookup_lock);
 
@@ -716,7 +710,7 @@ static int autofs4_dir_rmdir(struct inode *dir, struct dentry *dentry)
 		autofs_clear_leaf_automount_flags(dentry);
 
 	if (atomic_dec_and_test(&ino->count)) {
-		p_ino = autofs4_dentry_ino(dentry->d_parent);
+		p_ino = autofs_dentry_ino(dentry->d_parent);
 		if (p_ino && dentry->d_parent != dentry)
 			atomic_dec(&p_ino->count);
 	}
@@ -730,26 +724,26 @@ static int autofs4_dir_rmdir(struct inode *dir, struct dentry *dentry)
 	return 0;
 }
 
-static int autofs4_dir_mkdir(struct inode *dir,
-			     struct dentry *dentry, umode_t mode)
+static int autofs_dir_mkdir(struct inode *dir,
+			    struct dentry *dentry, umode_t mode)
 {
-	struct autofs_sb_info *sbi = autofs4_sbi(dir->i_sb);
-	struct autofs_info *ino = autofs4_dentry_ino(dentry);
+	struct autofs_sb_info *sbi = autofs_sbi(dir->i_sb);
+	struct autofs_info *ino = autofs_dentry_ino(dentry);
 	struct autofs_info *p_ino;
 	struct inode *inode;
 
-	if (!autofs4_oz_mode(sbi))
+	if (!autofs_oz_mode(sbi))
 		return -EACCES;
 
 	pr_debug("dentry %p, creating %pd\n", dentry, dentry);
 
 	BUG_ON(!ino);
 
-	autofs4_clean_ino(ino);
+	autofs_clean_ino(ino);
 
-	autofs4_del_active(dentry);
+	autofs_del_active(dentry);
 
-	inode = autofs4_get_inode(dir->i_sb, S_IFDIR | mode);
+	inode = autofs_get_inode(dir->i_sb, S_IFDIR | mode);
 	if (!inode)
 		return -ENOMEM;
 	d_add(dentry, inode);
@@ -759,7 +753,7 @@ static int autofs4_dir_mkdir(struct inode *dir,
 
 	dget(dentry);
 	atomic_inc(&ino->count);
-	p_ino = autofs4_dentry_ino(dentry->d_parent);
+	p_ino = autofs_dentry_ino(dentry->d_parent);
 	if (p_ino && !IS_ROOT(dentry))
 		atomic_inc(&p_ino->count);
 	inc_nlink(dir);
@@ -770,7 +764,7 @@ static int autofs4_dir_mkdir(struct inode *dir,
 
 /* Get/set timeout ioctl() operation */
 #ifdef CONFIG_COMPAT
-static inline int autofs4_compat_get_set_timeout(struct autofs_sb_info *sbi,
+static inline int autofs_compat_get_set_timeout(struct autofs_sb_info *sbi,
 						 compat_ulong_t __user *p)
 {
 	unsigned long ntimeout;
@@ -795,7 +789,7 @@ error:
 }
 #endif
 
-static inline int autofs4_get_set_timeout(struct autofs_sb_info *sbi,
+static inline int autofs_get_set_timeout(struct autofs_sb_info *sbi,
 					  unsigned long __user *p)
 {
 	unsigned long ntimeout;
@@ -820,14 +814,14 @@ error:
 }
 
 /* Return protocol version */
-static inline int autofs4_get_protover(struct autofs_sb_info *sbi,
+static inline int autofs_get_protover(struct autofs_sb_info *sbi,
 				       int __user *p)
 {
 	return put_user(sbi->version, p);
 }
 
 /* Return protocol sub version */
-static inline int autofs4_get_protosubver(struct autofs_sb_info *sbi,
+static inline int autofs_get_protosubver(struct autofs_sb_info *sbi,
 					  int __user *p)
 {
 	return put_user(sbi->sub_version, p);
@@ -836,7 +830,7 @@ static inline int autofs4_get_protosubver(struct autofs_sb_info *sbi,
 /*
 * Tells the daemon whether it can umount the autofs mount.
 */
-static inline int autofs4_ask_umount(struct vfsmount *mnt, int __user *p)
+static inline int autofs_ask_umount(struct vfsmount *mnt, int __user *p)
 {
 	int status = 0;
 
@@ -850,14 +844,14 @@ static inline int autofs4_ask_umount(struct vfsmount *mnt, int __user *p)
 	return status;
 }
 
-/* Identify autofs4_dentries - this is so we can tell if there's
+/* Identify autofs_dentries - this is so we can tell if there's
  * an extra dentry refcount or not.  We only hold a refcount on the
  * dentry if its non-negative (ie, d_inode != NULL)
  */
-int is_autofs4_dentry(struct dentry *dentry)
+int is_autofs_dentry(struct dentry *dentry)
 {
 	return dentry && d_really_is_positive(dentry) &&
-		dentry->d_op == &autofs4_dentry_operations &&
+		dentry->d_op == &autofs_dentry_operations &&
 		dentry->d_fsdata != NULL;
 }
 
@@ -865,10 +859,10 @@ int is_autofs4_dentry(struct dentry *dentry)
  * ioctl()'s on the root directory is the chief method for the daemon to
  * generate kernel reactions
  */
-static int autofs4_root_ioctl_unlocked(struct inode *inode, struct file *filp,
+static int autofs_root_ioctl_unlocked(struct inode *inode, struct file *filp,
 				       unsigned int cmd, unsigned long arg)
 {
-	struct autofs_sb_info *sbi = autofs4_sbi(inode->i_sb);
+	struct autofs_sb_info *sbi = autofs_sbi(inode->i_sb);
 	void __user *p = (void __user *)arg;
 
 	pr_debug("cmd = 0x%08x, arg = 0x%08lx, sbi = %p, pgrp = %u\n",
@@ -878,64 +872,63 @@ static int autofs4_root_ioctl_unlocked(struct inode *inode, struct file *filp,
 	     _IOC_NR(cmd) - _IOC_NR(AUTOFS_IOC_FIRST) >= AUTOFS_IOC_COUNT)
 		return -ENOTTY;
 
-	if (!autofs4_oz_mode(sbi) && !capable(CAP_SYS_ADMIN))
+	if (!autofs_oz_mode(sbi) && !capable(CAP_SYS_ADMIN))
 		return -EPERM;
 
 	switch (cmd) {
 	case AUTOFS_IOC_READY:	/* Wait queue: go ahead and retry */
-		return autofs4_wait_release(sbi, (autofs_wqt_t) arg, 0);
+		return autofs_wait_release(sbi, (autofs_wqt_t) arg, 0);
 	case AUTOFS_IOC_FAIL:	/* Wait queue: fail with ENOENT */
-		return autofs4_wait_release(sbi, (autofs_wqt_t) arg, -ENOENT);
+		return autofs_wait_release(sbi, (autofs_wqt_t) arg, -ENOENT);
 	case AUTOFS_IOC_CATATONIC: /* Enter catatonic mode (daemon shutdown) */
-		autofs4_catatonic_mode(sbi);
+		autofs_catatonic_mode(sbi);
 		return 0;
 	case AUTOFS_IOC_PROTOVER: /* Get protocol version */
-		return autofs4_get_protover(sbi, p);
+		return autofs_get_protover(sbi, p);
 	case AUTOFS_IOC_PROTOSUBVER: /* Get protocol sub version */
-		return autofs4_get_protosubver(sbi, p);
+		return autofs_get_protosubver(sbi, p);
 	case AUTOFS_IOC_SETTIMEOUT:
-		return autofs4_get_set_timeout(sbi, p);
+		return autofs_get_set_timeout(sbi, p);
 #ifdef CONFIG_COMPAT
 	case AUTOFS_IOC_SETTIMEOUT32:
-		return autofs4_compat_get_set_timeout(sbi, p);
+		return autofs_compat_get_set_timeout(sbi, p);
 #endif
 
 	case AUTOFS_IOC_ASKUMOUNT:
-		return autofs4_ask_umount(filp->f_path.mnt, p);
+		return autofs_ask_umount(filp->f_path.mnt, p);
 
 	/* return a single thing to expire */
 	case AUTOFS_IOC_EXPIRE:
-		return autofs4_expire_run(inode->i_sb,
-					  filp->f_path.mnt, sbi, p);
+		return autofs_expire_run(inode->i_sb, filp->f_path.mnt, sbi, p);
 	/* same as above, but can send multiple expires through pipe */
 	case AUTOFS_IOC_EXPIRE_MULTI:
-		return autofs4_expire_multi(inode->i_sb,
-					    filp->f_path.mnt, sbi, p);
+		return autofs_expire_multi(inode->i_sb,
+					   filp->f_path.mnt, sbi, p);
 
 	default:
 		return -EINVAL;
 	}
 }
 
-static long autofs4_root_ioctl(struct file *filp,
+static long autofs_root_ioctl(struct file *filp,
 			       unsigned int cmd, unsigned long arg)
 {
 	struct inode *inode = file_inode(filp);
 
-	return autofs4_root_ioctl_unlocked(inode, filp, cmd, arg);
+	return autofs_root_ioctl_unlocked(inode, filp, cmd, arg);
 }
 
 #ifdef CONFIG_COMPAT
-static long autofs4_root_compat_ioctl(struct file *filp,
+static long autofs_root_compat_ioctl(struct file *filp,
 				      unsigned int cmd, unsigned long arg)
 {
 	struct inode *inode = file_inode(filp);
 	int ret;
 
 	if (cmd == AUTOFS_IOC_READY || cmd == AUTOFS_IOC_FAIL)
-		ret = autofs4_root_ioctl_unlocked(inode, filp, cmd, arg);
+		ret = autofs_root_ioctl_unlocked(inode, filp, cmd, arg);
 	else
-		ret = autofs4_root_ioctl_unlocked(inode, filp, cmd,
+		ret = autofs_root_ioctl_unlocked(inode, filp, cmd,
 					      (unsigned long) compat_ptr(arg));
 
 	return ret;
diff --git a/fs/autofs4/symlink.c b/fs/autofs/symlink.c
index ab0b4285a202..aad3902c0cc1 100644
--- a/fs/autofs4/symlink.c
+++ b/fs/autofs/symlink.c
@@ -8,22 +8,22 @@
 
 #include "autofs_i.h"
 
-static const char *autofs4_get_link(struct dentry *dentry,
-				    struct inode *inode,
-				    struct delayed_call *done)
+static const char *autofs_get_link(struct dentry *dentry,
+				   struct inode *inode,
+				   struct delayed_call *done)
 {
 	struct autofs_sb_info *sbi;
 	struct autofs_info *ino;
 
 	if (!dentry)
 		return ERR_PTR(-ECHILD);
-	sbi = autofs4_sbi(dentry->d_sb);
-	ino = autofs4_dentry_ino(dentry);
-	if (ino && !autofs4_oz_mode(sbi))
+	sbi = autofs_sbi(dentry->d_sb);
+	ino = autofs_dentry_ino(dentry);
+	if (ino && !autofs_oz_mode(sbi))
 		ino->last_used = jiffies;
 	return d_inode(dentry)->i_private;
 }
 
-const struct inode_operations autofs4_symlink_inode_operations = {
-	.get_link	= autofs4_get_link
+const struct inode_operations autofs_symlink_inode_operations = {
+	.get_link	= autofs_get_link
 };
diff --git a/fs/autofs4/waitq.c b/fs/autofs/waitq.c
index be9c3dc048ab..f6385c6ef0a5 100644
--- a/fs/autofs4/waitq.c
+++ b/fs/autofs/waitq.c
@@ -7,19 +7,15 @@
  * option, any later version, incorporated herein by reference.
  */
 
-#include <linux/slab.h>
-#include <linux/time.h>
-#include <linux/signal.h>
 #include <linux/sched/signal.h>
-#include <linux/file.h>
 #include "autofs_i.h"
 
 /* We make this a static variable rather than a part of the superblock; it
  * is better if we don't reassign numbers easily even across filesystems
  */
-static autofs_wqt_t autofs4_next_wait_queue = 1;
+static autofs_wqt_t autofs_next_wait_queue = 1;
 
-void autofs4_catatonic_mode(struct autofs_sb_info *sbi)
+void autofs_catatonic_mode(struct autofs_sb_info *sbi)
 {
 	struct autofs_wait_queue *wq, *nwq;
 
@@ -49,8 +45,8 @@ void autofs4_catatonic_mode(struct autofs_sb_info *sbi)
 	mutex_unlock(&sbi->wq_mutex);
 }
 
-static int autofs4_write(struct autofs_sb_info *sbi,
-			 struct file *file, const void *addr, int bytes)
+static int autofs_write(struct autofs_sb_info *sbi,
+			struct file *file, const void *addr, int bytes)
 {
 	unsigned long sigpipe, flags;
 	const char *data = (const char *)addr;
@@ -82,7 +78,7 @@ static int autofs4_write(struct autofs_sb_info *sbi,
 	return bytes == 0 ? 0 : wr < 0 ? wr : -EIO;
 }
 
-static void autofs4_notify_daemon(struct autofs_sb_info *sbi,
+static void autofs_notify_daemon(struct autofs_sb_info *sbi,
 				 struct autofs_wait_queue *wq,
 				 int type)
 {
@@ -167,23 +163,23 @@ static void autofs4_notify_daemon(struct autofs_sb_info *sbi,
 
 	mutex_unlock(&sbi->wq_mutex);
 
-	switch (ret = autofs4_write(sbi, pipe, &pkt, pktsz)) {
+	switch (ret = autofs_write(sbi, pipe, &pkt, pktsz)) {
 	case 0:
 		break;
 	case -ENOMEM:
 	case -ERESTARTSYS:
 		/* Just fail this one */
-		autofs4_wait_release(sbi, wq->wait_queue_token, ret);
+		autofs_wait_release(sbi, wq->wait_queue_token, ret);
 		break;
 	default:
-		autofs4_catatonic_mode(sbi);
+		autofs_catatonic_mode(sbi);
 		break;
 	}
 	fput(pipe);
 }
 
-static int autofs4_getpath(struct autofs_sb_info *sbi,
-			   struct dentry *dentry, char **name)
+static int autofs_getpath(struct autofs_sb_info *sbi,
+			  struct dentry *dentry, char *name)
 {
 	struct dentry *root = sbi->sb->s_root;
 	struct dentry *tmp;
@@ -193,7 +189,7 @@ static int autofs4_getpath(struct autofs_sb_info *sbi,
 	unsigned seq;
 
 rename_retry:
-	buf = *name;
+	buf = name;
 	len = 0;
 
 	seq = read_seqbegin(&rename_lock);
@@ -228,7 +224,7 @@ rename_retry:
 }
 
 static struct autofs_wait_queue *
-autofs4_find_wait(struct autofs_sb_info *sbi, const struct qstr *qstr)
+autofs_find_wait(struct autofs_sb_info *sbi, const struct qstr *qstr)
 {
 	struct autofs_wait_queue *wq;
 
@@ -263,7 +259,7 @@ static int validate_request(struct autofs_wait_queue **wait,
 		return -ENOENT;
 
 	/* Wait in progress, continue; */
-	wq = autofs4_find_wait(sbi, qstr);
+	wq = autofs_find_wait(sbi, qstr);
 	if (wq) {
 		*wait = wq;
 		return 1;
@@ -272,7 +268,7 @@ static int validate_request(struct autofs_wait_queue **wait,
 	*wait = NULL;
 
 	/* If we don't yet have any info this is a new request */
-	ino = autofs4_dentry_ino(dentry);
+	ino = autofs_dentry_ino(dentry);
 	if (!ino)
 		return 1;
 
@@ -297,7 +293,7 @@ static int validate_request(struct autofs_wait_queue **wait,
 			if (sbi->catatonic)
 				return -ENOENT;
 
-			wq = autofs4_find_wait(sbi, qstr);
+			wq = autofs_find_wait(sbi, qstr);
 			if (wq) {
 				*wait = wq;
 				return 1;
@@ -351,7 +347,7 @@ static int validate_request(struct autofs_wait_queue **wait,
 	return 1;
 }
 
-int autofs4_wait(struct autofs_sb_info *sbi,
+int autofs_wait(struct autofs_sb_info *sbi,
 		 const struct path *path, enum autofs_notify notify)
 {
 	struct dentry *dentry = path->dentry;
@@ -399,7 +395,7 @@ int autofs4_wait(struct autofs_sb_info *sbi,
 	if (IS_ROOT(dentry) && autofs_type_trigger(sbi->type))
 		qstr.len = sprintf(name, "%p", dentry);
 	else {
-		qstr.len = autofs4_getpath(sbi, dentry, &name);
+		qstr.len = autofs_getpath(sbi, dentry, name);
 		if (!qstr.len) {
 			kfree(name);
 			return -ENOENT;
@@ -430,15 +426,15 @@ int autofs4_wait(struct autofs_sb_info *sbi,
 			return -ENOMEM;
 		}
 
-		wq->wait_queue_token = autofs4_next_wait_queue;
-		if (++autofs4_next_wait_queue == 0)
-			autofs4_next_wait_queue = 1;
+		wq->wait_queue_token = autofs_next_wait_queue;
+		if (++autofs_next_wait_queue == 0)
+			autofs_next_wait_queue = 1;
 		wq->next = sbi->queues;
 		sbi->queues = wq;
 		init_waitqueue_head(&wq->queue);
 		memcpy(&wq->name, &qstr, sizeof(struct qstr));
-		wq->dev = autofs4_get_dev(sbi);
-		wq->ino = autofs4_get_ino(sbi);
+		wq->dev = autofs_get_dev(sbi);
+		wq->ino = autofs_get_ino(sbi);
 		wq->uid = current_uid();
 		wq->gid = current_gid();
 		wq->pid = pid;
@@ -467,9 +463,9 @@ int autofs4_wait(struct autofs_sb_info *sbi,
 			 wq->name.name, notify);
 
 		/*
-		 * autofs4_notify_daemon() may block; it will unlock ->wq_mutex
+		 * autofs_notify_daemon() may block; it will unlock ->wq_mutex
 		 */
-		autofs4_notify_daemon(sbi, wq, type);
+		autofs_notify_daemon(sbi, wq, type);
 	} else {
 		wq->wait_ctr++;
 		pr_debug("existing wait id = 0x%08lx, name = %.*s, nfy=%d\n",
@@ -500,12 +496,12 @@ int autofs4_wait(struct autofs_sb_info *sbi,
 		struct dentry *de = NULL;
 
 		/* direct mount or browsable map */
-		ino = autofs4_dentry_ino(dentry);
+		ino = autofs_dentry_ino(dentry);
 		if (!ino) {
 			/* If not lookup actual dentry used */
 			de = d_lookup(dentry->d_parent, &dentry->d_name);
 			if (de)
-				ino = autofs4_dentry_ino(de);
+				ino = autofs_dentry_ino(de);
 		}
 
 		/* Set mount requester */
@@ -530,7 +526,8 @@ int autofs4_wait(struct autofs_sb_info *sbi,
 }
 
 
-int autofs4_wait_release(struct autofs_sb_info *sbi, autofs_wqt_t wait_queue_token, int status)
+int autofs_wait_release(struct autofs_sb_info *sbi,
+			autofs_wqt_t wait_queue_token, int status)
 {
 	struct autofs_wait_queue *wq, **wql;
 
diff --git a/fs/autofs4/Kconfig b/fs/autofs4/Kconfig
index 44727bf18297..99fda4d6da25 100644
--- a/fs/autofs4/Kconfig
+++ b/fs/autofs4/Kconfig
@@ -1,5 +1,7 @@
 config AUTOFS4_FS
-	tristate "Kernel automounter version 4 support (also supports v3)"
+	tristate "Kernel automounter version 4 support (also supports v3 and v5)"
+	default n
+	depends on AUTOFS_FS = n
 	help
 	  The automounter is a tool to automatically mount remote file systems
 	  on demand. This implementation is partially kernel-based to reduce
@@ -7,14 +9,38 @@ config AUTOFS4_FS
 	  automounter (amd), which is a pure user space daemon.
 
 	  To use the automounter you need the user-space tools from
-	  <https://www.kernel.org/pub/linux/daemons/autofs/v4/>; you also
-	  want to answer Y to "NFS file system support", below.
+	  <https://www.kernel.org/pub/linux/daemons/autofs/>; you also want
+	  to answer Y to "NFS file system support", below.
 
-	  To compile this support as a module, choose M here: the module will be
-	  called autofs4.  You will need to add "alias autofs autofs4" to your
-	  modules configuration file.
+	  This module is in the process of being renamed from autofs4 to
+	  autofs. Since autofs is now the only module that provides the
+	  autofs file system the module is not version 4 specific.
 
-	  If you are not a part of a fairly large, distributed network or
-	  don't have a laptop which needs to dynamically reconfigure to the
-	  local network, you probably do not need an automounter, and can say
-	  N here.
+	  The autofs4 module is now built from the source located in
+	  fs/autofs. The autofs4 directory and its configuration entry
+	  will be removed two kernel versions from the inclusion of this
+	  change.
+
+	  Changes that will need to be made should be limited to:
+	  - source include statments should be changed from autofs_fs4.h to
+	    autofs_fs.h since these two header files have been merged.
+	  - user space scripts that manually load autofs4.ko should be
+	    changed to load autofs.ko. But since the module directory name
+	    and the module name are the same as the file system name there
+	    is no need to manually load module.
+	  - any "alias autofs autofs4" will need to be removed.
+	  - due to the autofs4 module directory name not being the same as
+	    its file system name autoloading didn't work properly. Because
+	    of this kernel configurations would often build the module into
+	    the kernel. This may have resulted in selinux policies that will
+	    prevent the autofs module from autoloading and will need to be
+	    updated.
+
+	  Please configure AUTOFS_FS instead of AUTOFS4_FS from now on.
+
+	  NOTE: Since the modules autofs and autofs4 use the same file system
+		type name of "autofs" only one can be built. The "depends"
+		above will result in AUTOFS4_FS not appearing in .config for
+		any setting of AUTOFS_FS other than n and AUTOFS4_FS will
+		appear under the AUTOFS_FS entry otherwise which is intended
+		to draw attention to the module rename change.
diff --git a/fs/autofs4/Makefile b/fs/autofs4/Makefile
index a811c1f7d9ab..417dd726d9ef 100644
--- a/fs/autofs4/Makefile
+++ b/fs/autofs4/Makefile
@@ -4,4 +4,6 @@
 
 obj-$(CONFIG_AUTOFS4_FS) += autofs4.o
 
-autofs4-objs := init.o inode.o root.o symlink.o waitq.o expire.o dev-ioctl.o
+autofs4-objs := ../autofs/init.o ../autofs/inode.o ../autofs/root.o \
+	../autofs/symlink.o ../autofs/waitq.o ../autofs/expire.o \
+	../autofs/dev-ioctl.o
diff --git a/fs/binfmt_misc.c b/fs/binfmt_misc.c
index a41b48f82a70..4de191563261 100644
--- a/fs/binfmt_misc.c
+++ b/fs/binfmt_misc.c
@@ -387,8 +387,13 @@ static Node *create_entry(const char __user *buffer, size_t count)
 		s = strchr(p, del);
 		if (!s)
 			goto einval;
-		*s++ = '\0';
-		e->offset = simple_strtoul(p, &p, 10);
+		*s = '\0';
+		if (p != s) {
+			int r = kstrtoint(p, 10, &e->offset);
+			if (r != 0 || e->offset < 0)
+				goto einval;
+		}
+		p = s;
 		if (*p++)
 			goto einval;
 		pr_debug("register: offset: %#x\n", e->offset);
@@ -428,7 +433,8 @@ static Node *create_entry(const char __user *buffer, size_t count)
 		if (e->mask &&
 		    string_unescape_inplace(e->mask, UNESCAPE_HEX) != e->size)
 			goto einval;
-		if (e->size + e->offset > BINPRM_BUF_SIZE)
+		if (e->size > BINPRM_BUF_SIZE ||
+		    BINPRM_BUF_SIZE - e->size < e->offset)
 			goto einval;
 		pr_debug("register: magic/mask length: %i\n", e->size);
 		if (USE_DEBUG) {
diff --git a/fs/compat_ioctl.c b/fs/compat_ioctl.c
index ef80085ed564..9907475b4226 100644
--- a/fs/compat_ioctl.c
+++ b/fs/compat_ioctl.c
@@ -38,8 +38,6 @@
 #include <linux/ppp-ioctl.h>
 #include <linux/if_pppox.h>
 #include <linux/mtio.h>
-#include <linux/auto_fs.h>
-#include <linux/auto_fs4.h>
 #include <linux/tty.h>
 #include <linux/vt_kern.h>
 #include <linux/fb.h>
diff --git a/fs/dax.c b/fs/dax.c
index aa86d9f971a4..08656a2f2aa6 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -905,12 +905,12 @@ out:
  * If this page is ever written to we will re-fault and change the mapping to
  * point to real DAX storage instead.
  */
-static int dax_load_hole(struct address_space *mapping, void *entry,
+static vm_fault_t dax_load_hole(struct address_space *mapping, void *entry,
 			 struct vm_fault *vmf)
 {
 	struct inode *inode = mapping->host;
 	unsigned long vaddr = vmf->address;
-	int ret = VM_FAULT_NOPAGE;
+	vm_fault_t ret = VM_FAULT_NOPAGE;
 	struct page *zero_page;
 	void *entry2;
 	pfn_t pfn;
@@ -929,7 +929,7 @@ static int dax_load_hole(struct address_space *mapping, void *entry,
 		goto out;
 	}
 
-	vm_insert_mixed(vmf->vma, vaddr, pfn);
+	ret = vmf_insert_mixed(vmf->vma, vaddr, pfn);
 out:
 	trace_dax_load_hole(inode, vmf, ret);
 	return ret;
@@ -1112,7 +1112,7 @@ dax_iomap_rw(struct kiocb *iocb, struct iov_iter *iter,
 }
 EXPORT_SYMBOL_GPL(dax_iomap_rw);
 
-static int dax_fault_return(int error)
+static vm_fault_t dax_fault_return(int error)
 {
 	if (error == 0)
 		return VM_FAULT_NOPAGE;
@@ -1132,7 +1132,7 @@ static bool dax_fault_is_synchronous(unsigned long flags,
 		&& (iomap->flags & IOMAP_F_DIRTY);
 }
 
-static int dax_iomap_pte_fault(struct vm_fault *vmf, pfn_t *pfnp,
+static vm_fault_t dax_iomap_pte_fault(struct vm_fault *vmf, pfn_t *pfnp,
 			       int *iomap_errp, const struct iomap_ops *ops)
 {
 	struct vm_area_struct *vma = vmf->vma;
@@ -1145,18 +1145,18 @@ static int dax_iomap_pte_fault(struct vm_fault *vmf, pfn_t *pfnp,
 	int error, major = 0;
 	bool write = vmf->flags & FAULT_FLAG_WRITE;
 	bool sync;
-	int vmf_ret = 0;
+	vm_fault_t ret = 0;
 	void *entry;
 	pfn_t pfn;
 
-	trace_dax_pte_fault(inode, vmf, vmf_ret);
+	trace_dax_pte_fault(inode, vmf, ret);
 	/*
 	 * Check whether offset isn't beyond end of file now. Caller is supposed
 	 * to hold locks serializing us with truncate / punch hole so this is
 	 * a reliable test.
 	 */
 	if (pos >= i_size_read(inode)) {
-		vmf_ret = VM_FAULT_SIGBUS;
+		ret = VM_FAULT_SIGBUS;
 		goto out;
 	}
 
@@ -1165,7 +1165,7 @@ static int dax_iomap_pte_fault(struct vm_fault *vmf, pfn_t *pfnp,
 
 	entry = grab_mapping_entry(mapping, vmf->pgoff, 0);
 	if (IS_ERR(entry)) {
-		vmf_ret = dax_fault_return(PTR_ERR(entry));
+		ret = dax_fault_return(PTR_ERR(entry));
 		goto out;
 	}
 
@@ -1176,7 +1176,7 @@ static int dax_iomap_pte_fault(struct vm_fault *vmf, pfn_t *pfnp,
 	 * retried.
 	 */
 	if (pmd_trans_huge(*vmf->pmd) || pmd_devmap(*vmf->pmd)) {
-		vmf_ret = VM_FAULT_NOPAGE;
+		ret = VM_FAULT_NOPAGE;
 		goto unlock_entry;
 	}
 
@@ -1189,7 +1189,7 @@ static int dax_iomap_pte_fault(struct vm_fault *vmf, pfn_t *pfnp,
 	if (iomap_errp)
 		*iomap_errp = error;
 	if (error) {
-		vmf_ret = dax_fault_return(error);
+		ret = dax_fault_return(error);
 		goto unlock_entry;
 	}
 	if (WARN_ON_ONCE(iomap.offset + iomap.length < pos + PAGE_SIZE)) {
@@ -1219,9 +1219,9 @@ static int dax_iomap_pte_fault(struct vm_fault *vmf, pfn_t *pfnp,
 			goto error_finish_iomap;
 
 		__SetPageUptodate(vmf->cow_page);
-		vmf_ret = finish_fault(vmf);
-		if (!vmf_ret)
-			vmf_ret = VM_FAULT_DONE_COW;
+		ret = finish_fault(vmf);
+		if (!ret)
+			ret = VM_FAULT_DONE_COW;
 		goto finish_iomap;
 	}
 
@@ -1257,23 +1257,20 @@ static int dax_iomap_pte_fault(struct vm_fault *vmf, pfn_t *pfnp,
 				goto error_finish_iomap;
 			}
 			*pfnp = pfn;
-			vmf_ret = VM_FAULT_NEEDDSYNC | major;
+			ret = VM_FAULT_NEEDDSYNC | major;
 			goto finish_iomap;
 		}
 		trace_dax_insert_mapping(inode, vmf, entry);
 		if (write)
-			error = vm_insert_mixed_mkwrite(vma, vaddr, pfn);
+			ret = vmf_insert_mixed_mkwrite(vma, vaddr, pfn);
 		else
-			error = vm_insert_mixed(vma, vaddr, pfn);
+			ret = vmf_insert_mixed(vma, vaddr, pfn);
 
-		/* -EBUSY is fine, somebody else faulted on the same PTE */
-		if (error == -EBUSY)
-			error = 0;
-		break;
+		goto finish_iomap;
 	case IOMAP_UNWRITTEN:
 	case IOMAP_HOLE:
 		if (!write) {
-			vmf_ret = dax_load_hole(mapping, entry, vmf);
+			ret = dax_load_hole(mapping, entry, vmf);
 			goto finish_iomap;
 		}
 		/*FALLTHRU*/
@@ -1284,12 +1281,12 @@ static int dax_iomap_pte_fault(struct vm_fault *vmf, pfn_t *pfnp,
 	}
 
  error_finish_iomap:
-	vmf_ret = dax_fault_return(error) | major;
+	ret = dax_fault_return(error);
  finish_iomap:
 	if (ops->iomap_end) {
 		int copied = PAGE_SIZE;
 
-		if (vmf_ret & VM_FAULT_ERROR)
+		if (ret & VM_FAULT_ERROR)
 			copied = 0;
 		/*
 		 * The fault is done by now and there's no way back (other
@@ -1302,12 +1299,12 @@ static int dax_iomap_pte_fault(struct vm_fault *vmf, pfn_t *pfnp,
  unlock_entry:
 	put_locked_mapping_entry(mapping, vmf->pgoff);
  out:
-	trace_dax_pte_fault_done(inode, vmf, vmf_ret);
-	return vmf_ret;
+	trace_dax_pte_fault_done(inode, vmf, ret);
+	return ret | major;
 }
 
 #ifdef CONFIG_FS_DAX_PMD
-static int dax_pmd_load_hole(struct vm_fault *vmf, struct iomap *iomap,
+static vm_fault_t dax_pmd_load_hole(struct vm_fault *vmf, struct iomap *iomap,
 		void *entry)
 {
 	struct address_space *mapping = vmf->vma->vm_file->f_mapping;
@@ -1348,7 +1345,7 @@ fallback:
 	return VM_FAULT_FALLBACK;
 }
 
-static int dax_iomap_pmd_fault(struct vm_fault *vmf, pfn_t *pfnp,
+static vm_fault_t dax_iomap_pmd_fault(struct vm_fault *vmf, pfn_t *pfnp,
 			       const struct iomap_ops *ops)
 {
 	struct vm_area_struct *vma = vmf->vma;
@@ -1358,7 +1355,7 @@ static int dax_iomap_pmd_fault(struct vm_fault *vmf, pfn_t *pfnp,
 	bool sync;
 	unsigned int iomap_flags = (write ? IOMAP_WRITE : 0) | IOMAP_FAULT;
 	struct inode *inode = mapping->host;
-	int result = VM_FAULT_FALLBACK;
+	vm_fault_t result = VM_FAULT_FALLBACK;
 	struct iomap iomap = { 0 };
 	pgoff_t max_pgoff, pgoff;
 	void *entry;
@@ -1509,7 +1506,7 @@ out:
 	return result;
 }
 #else
-static int dax_iomap_pmd_fault(struct vm_fault *vmf, pfn_t *pfnp,
+static vm_fault_t dax_iomap_pmd_fault(struct vm_fault *vmf, pfn_t *pfnp,
 			       const struct iomap_ops *ops)
 {
 	return VM_FAULT_FALLBACK;
@@ -1529,7 +1526,7 @@ static int dax_iomap_pmd_fault(struct vm_fault *vmf, pfn_t *pfnp,
  * has done all the necessary locking for page fault to proceed
  * successfully.
  */
-int dax_iomap_fault(struct vm_fault *vmf, enum page_entry_size pe_size,
+vm_fault_t dax_iomap_fault(struct vm_fault *vmf, enum page_entry_size pe_size,
 		    pfn_t *pfnp, int *iomap_errp, const struct iomap_ops *ops)
 {
 	switch (pe_size) {
@@ -1553,14 +1550,14 @@ EXPORT_SYMBOL_GPL(dax_iomap_fault);
  * DAX file.  It takes care of marking corresponding radix tree entry as dirty
  * as well.
  */
-static int dax_insert_pfn_mkwrite(struct vm_fault *vmf,
+static vm_fault_t dax_insert_pfn_mkwrite(struct vm_fault *vmf,
 				  enum page_entry_size pe_size,
 				  pfn_t pfn)
 {
 	struct address_space *mapping = vmf->vma->vm_file->f_mapping;
 	void *entry, **slot;
 	pgoff_t index = vmf->pgoff;
-	int vmf_ret, error;
+	vm_fault_t ret;
 
 	xa_lock_irq(&mapping->i_pages);
 	entry = get_unlocked_mapping_entry(mapping, index, &slot);
@@ -1579,21 +1576,20 @@ static int dax_insert_pfn_mkwrite(struct vm_fault *vmf,
 	xa_unlock_irq(&mapping->i_pages);
 	switch (pe_size) {
 	case PE_SIZE_PTE:
-		error = vm_insert_mixed_mkwrite(vmf->vma, vmf->address, pfn);
-		vmf_ret = dax_fault_return(error);
+		ret = vmf_insert_mixed_mkwrite(vmf->vma, vmf->address, pfn);
 		break;
 #ifdef CONFIG_FS_DAX_PMD
 	case PE_SIZE_PMD:
-		vmf_ret = vmf_insert_pfn_pmd(vmf->vma, vmf->address, vmf->pmd,
+		ret = vmf_insert_pfn_pmd(vmf->vma, vmf->address, vmf->pmd,
 			pfn, true);
 		break;
 #endif
 	default:
-		vmf_ret = VM_FAULT_FALLBACK;
+		ret = VM_FAULT_FALLBACK;
 	}
 	put_locked_mapping_entry(mapping, index);
-	trace_dax_insert_pfn_mkwrite(mapping->host, vmf, vmf_ret);
-	return vmf_ret;
+	trace_dax_insert_pfn_mkwrite(mapping->host, vmf, ret);
+	return ret;
 }
 
 /**
@@ -1606,8 +1602,8 @@ static int dax_insert_pfn_mkwrite(struct vm_fault *vmf,
  * stored persistently on the media and handles inserting of appropriate page
  * table entry.
  */
-int dax_finish_sync_fault(struct vm_fault *vmf, enum page_entry_size pe_size,
-			  pfn_t pfn)
+vm_fault_t dax_finish_sync_fault(struct vm_fault *vmf,
+		enum page_entry_size pe_size, pfn_t pfn)
 {
 	int err;
 	loff_t start = ((loff_t)vmf->pgoff) << PAGE_SHIFT;
diff --git a/fs/fcntl.c b/fs/fcntl.c
index c42169459298..12273b6ea56d 100644
--- a/fs/fcntl.c
+++ b/fs/fcntl.c
@@ -23,7 +23,7 @@
 #include <linux/rcupdate.h>
 #include <linux/pid_namespace.h>
 #include <linux/user_namespace.h>
-#include <linux/shmem_fs.h>
+#include <linux/memfd.h>
 #include <linux/compat.h>
 
 #include <linux/poll.h>
diff --git a/fs/ocfs2/dlmglue.c b/fs/ocfs2/dlmglue.c
index 97a972efab83..68728de12864 100644
--- a/fs/ocfs2/dlmglue.c
+++ b/fs/ocfs2/dlmglue.c
@@ -788,35 +788,34 @@ static inline void ocfs2_add_holder(struct ocfs2_lock_res *lockres,
 	spin_unlock(&lockres->l_lock);
 }
 
-static inline void ocfs2_remove_holder(struct ocfs2_lock_res *lockres,
-				       struct ocfs2_lock_holder *oh)
-{
-	spin_lock(&lockres->l_lock);
-	list_del(&oh->oh_list);
-	spin_unlock(&lockres->l_lock);
-
-	put_pid(oh->oh_owner_pid);
-}
-
-static inline int ocfs2_is_locked_by_me(struct ocfs2_lock_res *lockres)
+static struct ocfs2_lock_holder *
+ocfs2_pid_holder(struct ocfs2_lock_res *lockres,
+		struct pid *pid)
 {
 	struct ocfs2_lock_holder *oh;
-	struct pid *pid;
 
-	/* look in the list of holders for one with the current task as owner */
 	spin_lock(&lockres->l_lock);
-	pid = task_pid(current);
 	list_for_each_entry(oh, &lockres->l_holders, oh_list) {
 		if (oh->oh_owner_pid == pid) {
 			spin_unlock(&lockres->l_lock);
-			return 1;
+			return oh;
 		}
 	}
 	spin_unlock(&lockres->l_lock);
+	return NULL;
+}
 
-	return 0;
+static inline void ocfs2_remove_holder(struct ocfs2_lock_res *lockres,
+				       struct ocfs2_lock_holder *oh)
+{
+	spin_lock(&lockres->l_lock);
+	list_del(&oh->oh_list);
+	spin_unlock(&lockres->l_lock);
+
+	put_pid(oh->oh_owner_pid);
 }
 
+
 static inline void ocfs2_inc_holders(struct ocfs2_lock_res *lockres,
 				     int level)
 {
@@ -2610,34 +2609,93 @@ void ocfs2_inode_unlock(struct inode *inode,
  *
  * return < 0 on error, return == 0 if there's no lock holder on the stack
  * before this call, return == 1 if this call would be a recursive locking.
+ * return == -1 if this lock attempt will cause an upgrade which is forbidden.
+ *
+ * When taking lock levels into account,we face some different situations.
+ *
+ * 1. no lock is held
+ *    In this case, just lock the inode as requested and return 0
+ *
+ * 2. We are holding a lock
+ *    For this situation, things diverges into several cases
+ *
+ *    wanted     holding	     what to do
+ *    ex		ex	    see 2.1 below
+ *    ex		pr	    see 2.2 below
+ *    pr		ex	    see 2.1 below
+ *    pr		pr	    see 2.1 below
+ *
+ *    2.1 lock level that is been held is compatible
+ *    with the wanted level, so no lock action will be tacken.
+ *
+ *    2.2 Otherwise, an upgrade is needed, but it is forbidden.
+ *
+ * Reason why upgrade within a process is forbidden is that
+ * lock upgrade may cause dead lock. The following illustrates
+ * how it happens.
+ *
+ *         thread on node1                             thread on node2
+ * ocfs2_inode_lock_tracker(ex=0)
+ *
+ *                                <======   ocfs2_inode_lock_tracker(ex=1)
+ *
+ * ocfs2_inode_lock_tracker(ex=1)
  */
 int ocfs2_inode_lock_tracker(struct inode *inode,
 			     struct buffer_head **ret_bh,
 			     int ex,
 			     struct ocfs2_lock_holder *oh)
 {
-	int status;
-	int arg_flags = 0, has_locked;
+	int status = 0;
 	struct ocfs2_lock_res *lockres;
+	struct ocfs2_lock_holder *tmp_oh;
+	struct pid *pid = task_pid(current);
+
 
 	lockres = &OCFS2_I(inode)->ip_inode_lockres;
-	has_locked = ocfs2_is_locked_by_me(lockres);
-	/* Just get buffer head if the cluster lock has been taken */
-	if (has_locked)
-		arg_flags = OCFS2_META_LOCK_GETBH;
+	tmp_oh = ocfs2_pid_holder(lockres, pid);
 
-	if (likely(!has_locked || ret_bh)) {
-		status = ocfs2_inode_lock_full(inode, ret_bh, ex, arg_flags);
+	if (!tmp_oh) {
+		/*
+		 * This corresponds to the case 1.
+		 * We haven't got any lock before.
+		 */
+		status = ocfs2_inode_lock_full(inode, ret_bh, ex, 0);
 		if (status < 0) {
 			if (status != -ENOENT)
 				mlog_errno(status);
 			return status;
 		}
-	}
-	if (!has_locked)
+
+		oh->oh_ex = ex;
 		ocfs2_add_holder(lockres, oh);
+		return 0;
+	}
 
-	return has_locked;
+	if (unlikely(ex && !tmp_oh->oh_ex)) {
+		/*
+		 * case 2.2 upgrade may cause dead lock, forbid it.
+		 */
+		mlog(ML_ERROR, "Recursive locking is not permitted to "
+		     "upgrade to EX level from PR level.\n");
+		dump_stack();
+		return -EINVAL;
+	}
+
+	/*
+	 *  case 2.1 OCFS2_META_LOCK_GETBH flag make ocfs2_inode_lock_full.
+	 *  ignore the lock level and just update it.
+	 */
+	if (ret_bh) {
+		status = ocfs2_inode_lock_full(inode, ret_bh, ex,
+					       OCFS2_META_LOCK_GETBH);
+		if (status < 0) {
+			if (status != -ENOENT)
+				mlog_errno(status);
+			return status;
+		}
+	}
+	return tmp_oh ? 1 : 0;
 }
 
 void ocfs2_inode_unlock_tracker(struct inode *inode,
@@ -2649,12 +2707,13 @@ void ocfs2_inode_unlock_tracker(struct inode *inode,
 
 	lockres = &OCFS2_I(inode)->ip_inode_lockres;
 	/* had_lock means that the currect process already takes the cluster
-	 * lock previously. If had_lock is 1, we have nothing to do here, and
-	 * it will get unlocked where we got the lock.
+	 * lock previously.
+	 * If had_lock is 1, we have nothing to do here.
+	 * If had_lock is 0, we will release the lock.
 	 */
 	if (!had_lock) {
+		ocfs2_inode_unlock(inode, oh->oh_ex);
 		ocfs2_remove_holder(lockres, oh);
-		ocfs2_inode_unlock(inode, ex);
 	}
 }
 
diff --git a/fs/ocfs2/dlmglue.h b/fs/ocfs2/dlmglue.h
index 256e0a9067b8..4ec1c828f6e0 100644
--- a/fs/ocfs2/dlmglue.h
+++ b/fs/ocfs2/dlmglue.h
@@ -96,6 +96,7 @@ struct ocfs2_trim_fs_info {
 struct ocfs2_lock_holder {
 	struct list_head oh_list;
 	struct pid *oh_owner_pid;
+	int oh_ex;
 };
 
 /* ocfs2_inode_lock_full() 'arg_flags' flags */
diff --git a/fs/ocfs2/file.c b/fs/ocfs2/file.c
index 6ee94bc23f5b..a2a8603d27e0 100644
--- a/fs/ocfs2/file.c
+++ b/fs/ocfs2/file.c
@@ -563,8 +563,8 @@ int ocfs2_add_inode_data(struct ocfs2_super *osb,
 	return ret;
 }
 
-static int __ocfs2_extend_allocation(struct inode *inode, u32 logical_start,
-				     u32 clusters_to_add, int mark_unwritten)
+static int ocfs2_extend_allocation(struct inode *inode, u32 logical_start,
+				   u32 clusters_to_add, int mark_unwritten)
 {
 	int status = 0;
 	int restart_func = 0;
@@ -1035,8 +1035,8 @@ int ocfs2_extend_no_holes(struct inode *inode, struct buffer_head *di_bh,
 		clusters_to_add -= oi->ip_clusters;
 
 	if (clusters_to_add) {
-		ret = __ocfs2_extend_allocation(inode, oi->ip_clusters,
-						clusters_to_add, 0);
+		ret = ocfs2_extend_allocation(inode, oi->ip_clusters,
+					      clusters_to_add, 0);
 		if (ret) {
 			mlog_errno(ret);
 			goto out;
@@ -1493,7 +1493,7 @@ static int ocfs2_allocate_unwritten_extents(struct inode *inode,
 			goto next;
 		}
 
-		ret = __ocfs2_extend_allocation(inode, cpos, alloc_size, 1);
+		ret = ocfs2_extend_allocation(inode, cpos, alloc_size, 1);
 		if (ret) {
 			if (ret != -ENOSPC)
 				mlog_errno(ret);
diff --git a/fs/ocfs2/file.h b/fs/ocfs2/file.h
index 1fdc9839cd93..7eb7f03531f6 100644
--- a/fs/ocfs2/file.h
+++ b/fs/ocfs2/file.h
@@ -65,8 +65,6 @@ int ocfs2_extend_no_holes(struct inode *inode, struct buffer_head *di_bh,
 			  u64 new_i_size, u64 zero_to);
 int ocfs2_zero_extend(struct inode *inode, struct buffer_head *di_bh,
 		      loff_t zero_to);
-int ocfs2_extend_allocation(struct inode *inode, u32 logical_start,
-		u32 clusters_to_add, int mark_unwritten);
 int ocfs2_setattr(struct dentry *dentry, struct iattr *attr);
 int ocfs2_getattr(const struct path *path, struct kstat *stat,
 		  u32 request_mask, unsigned int flags);
diff --git a/fs/ocfs2/ioctl.c b/fs/ocfs2/ioctl.c
index ab30c005cc4b..994726ada857 100644
--- a/fs/ocfs2/ioctl.c
+++ b/fs/ocfs2/ioctl.c
@@ -402,7 +402,7 @@ out_err:
 static void o2ffg_update_histogram(struct ocfs2_info_free_chunk_list *hist,
 				   unsigned int chunksize)
 {
-	int index;
+	u32 index;
 
 	index = __ilog2_u32(chunksize);
 	if (index >= OCFS2_INFO_MAX_HIST)
diff --git a/fs/ocfs2/mmap.c b/fs/ocfs2/mmap.c
index fb9a20e3d608..05220b365fb9 100644
--- a/fs/ocfs2/mmap.c
+++ b/fs/ocfs2/mmap.c
@@ -44,11 +44,11 @@
 #include "ocfs2_trace.h"
 
 
-static int ocfs2_fault(struct vm_fault *vmf)
+static vm_fault_t ocfs2_fault(struct vm_fault *vmf)
 {
 	struct vm_area_struct *vma = vmf->vma;
 	sigset_t oldset;
-	int ret;
+	vm_fault_t ret;
 
 	ocfs2_block_signals(&oldset);
 	ret = filemap_fault(vmf);
@@ -59,10 +59,11 @@ static int ocfs2_fault(struct vm_fault *vmf)
 	return ret;
 }
 
-static int __ocfs2_page_mkwrite(struct file *file, struct buffer_head *di_bh,
-				struct page *page)
+static vm_fault_t __ocfs2_page_mkwrite(struct file *file,
+			struct buffer_head *di_bh, struct page *page)
 {
-	int ret = VM_FAULT_NOPAGE;
+	int err;
+	vm_fault_t ret = VM_FAULT_NOPAGE;
 	struct inode *inode = file_inode(file);
 	struct address_space *mapping = inode->i_mapping;
 	loff_t pos = page_offset(page);
@@ -105,15 +106,12 @@ static int __ocfs2_page_mkwrite(struct file *file, struct buffer_head *di_bh,
 	if (page->index == last_index)
 		len = ((size - 1) & ~PAGE_MASK) + 1;
 
-	ret = ocfs2_write_begin_nolock(mapping, pos, len, OCFS2_WRITE_MMAP,
+	err = ocfs2_write_begin_nolock(mapping, pos, len, OCFS2_WRITE_MMAP,
 				       &locked_page, &fsdata, di_bh, page);
-	if (ret) {
-		if (ret != -ENOSPC)
-			mlog_errno(ret);
-		if (ret == -ENOMEM)
-			ret = VM_FAULT_OOM;
-		else
-			ret = VM_FAULT_SIGBUS;
+	if (err) {
+		if (err != -ENOSPC)
+			mlog_errno(err);
+		ret = vmf_error(err);
 		goto out;
 	}
 
@@ -121,20 +119,21 @@ static int __ocfs2_page_mkwrite(struct file *file, struct buffer_head *di_bh,
 		ret = VM_FAULT_NOPAGE;
 		goto out;
 	}
-	ret = ocfs2_write_end_nolock(mapping, pos, len, len, fsdata);
-	BUG_ON(ret != len);
+	err = ocfs2_write_end_nolock(mapping, pos, len, len, fsdata);
+	BUG_ON(err != len);
 	ret = VM_FAULT_LOCKED;
 out:
 	return ret;
 }
 
-static int ocfs2_page_mkwrite(struct vm_fault *vmf)
+static vm_fault_t ocfs2_page_mkwrite(struct vm_fault *vmf)
 {
 	struct page *page = vmf->page;
 	struct inode *inode = file_inode(vmf->vma->vm_file);
 	struct buffer_head *di_bh = NULL;
 	sigset_t oldset;
-	int ret;
+	int err;
+	vm_fault_t ret;
 
 	sb_start_pagefault(inode->i_sb);
 	ocfs2_block_signals(&oldset);
@@ -144,13 +143,10 @@ static int ocfs2_page_mkwrite(struct vm_fault *vmf)
 	 * node. Taking the data lock will also ensure that we don't
 	 * attempt page truncation as part of a downconvert.
 	 */
-	ret = ocfs2_inode_lock(inode, &di_bh, 1);
-	if (ret < 0) {
-		mlog_errno(ret);
-		if (ret == -ENOMEM)
-			ret = VM_FAULT_OOM;
-		else
-			ret = VM_FAULT_SIGBUS;
+	err = ocfs2_inode_lock(inode, &di_bh, 1);
+	if (err < 0) {
+		mlog_errno(err);
+		ret = vmf_error(err);
 		goto out;
 	}
 
diff --git a/fs/ocfs2/namei.c b/fs/ocfs2/namei.c
index 8dd6f703c819..b7ca84bc3df7 100644
--- a/fs/ocfs2/namei.c
+++ b/fs/ocfs2/namei.c
@@ -2332,8 +2332,7 @@ int ocfs2_orphan_del(struct ocfs2_super *osb,
 		     struct buffer_head *orphan_dir_bh,
 		     bool dio)
 {
-	const int namelen = OCFS2_DIO_ORPHAN_PREFIX_LEN + OCFS2_ORPHAN_NAMELEN;
-	char name[namelen + 1];
+	char name[OCFS2_DIO_ORPHAN_PREFIX_LEN + OCFS2_ORPHAN_NAMELEN + 1];
 	struct ocfs2_dinode *orphan_fe;
 	int status = 0;
 	struct ocfs2_dir_lookup_result lookup = { NULL, };
diff --git a/fs/ocfs2/ocfs2_fs.h b/fs/ocfs2/ocfs2_fs.h
index 5bb4a89f9045..7071ad0dec90 100644
--- a/fs/ocfs2/ocfs2_fs.h
+++ b/fs/ocfs2/ocfs2_fs.h
@@ -807,11 +807,11 @@ struct ocfs2_dir_block_trailer {
 						 * in this block. (unused) */
 /*10*/	__u8		db_signature[8];	/* Signature for verification */
 	__le64		db_reserved2;
-	__le64		db_free_next;		/* Next block in list (unused) */
-/*20*/	__le64		db_blkno;		/* Offset on disk, in blocks */
-	__le64		db_parent_dinode;	/* dinode which owns me, in
+/*20*/	__le64		db_free_next;		/* Next block in list (unused) */
+	__le64		db_blkno;		/* Offset on disk, in blocks */
+/*30*/	__le64		db_parent_dinode;	/* dinode which owns me, in
 						   blocks */
-/*30*/	struct ocfs2_block_check db_check;	/* Error checking */
+	struct ocfs2_block_check db_check;	/* Error checking */
 /*40*/
 };
 
diff --git a/fs/proc/array.c b/fs/proc/array.c
index 004077f1a7bf..0ceb3b6b37e7 100644
--- a/fs/proc/array.c
+++ b/fs/proc/array.c
@@ -268,7 +268,7 @@ static inline void task_sig(struct seq_file *m, struct task_struct *p)
 	unsigned long flags;
 	sigset_t pending, shpending, blocked, ignored, caught;
 	int num_threads = 0;
-	unsigned long qsize = 0;
+	unsigned int qsize = 0;
 	unsigned long qlim = 0;
 
 	sigemptyset(&pending);
diff --git a/fs/proc/base.c b/fs/proc/base.c
index af128b374143..44dec22e5e9e 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -213,10 +213,14 @@ static ssize_t proc_pid_cmdline_read(struct file *file, char __user *buf,
 	char *page;
 	unsigned long count = _count;
 	unsigned long arg_start, arg_end, env_start, env_end;
-	unsigned long len1, len2, len;
-	unsigned long p;
+	unsigned long len1, len2;
+	char __user *buf0 = buf;
+	struct {
+		unsigned long p;
+		unsigned long len;
+	} cmdline[2];
 	char c;
-	ssize_t rv;
+	int rv;
 
 	BUG_ON(*pos < 0);
 
@@ -239,12 +243,12 @@ static ssize_t proc_pid_cmdline_read(struct file *file, char __user *buf,
 		goto out_mmput;
 	}
 
-	down_read(&mm->mmap_sem);
+	spin_lock(&mm->arg_lock);
 	arg_start = mm->arg_start;
 	arg_end = mm->arg_end;
 	env_start = mm->env_start;
 	env_end = mm->env_end;
-	up_read(&mm->mmap_sem);
+	spin_unlock(&mm->arg_lock);
 
 	BUG_ON(arg_start > arg_end);
 	BUG_ON(env_start > env_end);
@@ -253,61 +257,31 @@ static ssize_t proc_pid_cmdline_read(struct file *file, char __user *buf,
 	len2 = env_end - env_start;
 
 	/* Empty ARGV. */
-	if (len1 == 0) {
-		rv = 0;
-		goto out_free_page;
-	}
+	if (len1 == 0)
+		goto end;
+
 	/*
 	 * Inherently racy -- command line shares address space
 	 * with code and data.
 	 */
-	rv = access_remote_vm(mm, arg_end - 1, &c, 1, FOLL_ANON);
-	if (rv <= 0)
-		goto out_free_page;
-
-	rv = 0;
+	if (access_remote_vm(mm, arg_end - 1, &c, 1, FOLL_ANON) != 1)
+		goto end;
 
+	cmdline[0].p = arg_start;
+	cmdline[0].len = len1;
 	if (c == '\0') {
 		/* Command line (set of strings) occupies whole ARGV. */
-		if (len1 <= *pos)
-			goto out_free_page;
-
-		p = arg_start + *pos;
-		len = len1 - *pos;
-		while (count > 0 && len > 0) {
-			unsigned int _count;
-			int nr_read;
-
-			_count = min3(count, len, PAGE_SIZE);
-			nr_read = access_remote_vm(mm, p, page, _count, FOLL_ANON);
-			if (nr_read < 0)
-				rv = nr_read;
-			if (nr_read <= 0)
-				goto out_free_page;
-
-			if (copy_to_user(buf, page, nr_read)) {
-				rv = -EFAULT;
-				goto out_free_page;
-			}
-
-			p	+= nr_read;
-			len	-= nr_read;
-			buf	+= nr_read;
-			count	-= nr_read;
-			rv	+= nr_read;
-		}
+		cmdline[1].len = 0;
 	} else {
 		/*
 		 * Command line (1 string) occupies ARGV and
 		 * extends into ENVP.
 		 */
-		struct {
-			unsigned long p;
-			unsigned long len;
-		} cmdline[2] = {
-			{ .p = arg_start, .len = len1 },
-			{ .p = env_start, .len = len2 },
-		};
+		cmdline[1].p = env_start;
+		cmdline[1].len = len2;
+	}
+
+	{
 		loff_t pos1 = *pos;
 		unsigned int i;
 
@@ -317,44 +291,40 @@ static ssize_t proc_pid_cmdline_read(struct file *file, char __user *buf,
 			i++;
 		}
 		while (i < 2) {
+			unsigned long p;
+			unsigned long len;
+
 			p = cmdline[i].p + pos1;
 			len = cmdline[i].len - pos1;
 			while (count > 0 && len > 0) {
-				unsigned int _count, l;
-				int nr_read;
-				bool final;
-
-				_count = min3(count, len, PAGE_SIZE);
-				nr_read = access_remote_vm(mm, p, page, _count, FOLL_ANON);
-				if (nr_read < 0)
-					rv = nr_read;
-				if (nr_read <= 0)
-					goto out_free_page;
+				unsigned int nr_read, nr_write;
+
+				nr_read = min3(count, len, PAGE_SIZE);
+				nr_read = access_remote_vm(mm, p, page, nr_read, FOLL_ANON);
+				if (nr_read == 0)
+					goto end;
 
 				/*
 				 * Command line can be shorter than whole ARGV
 				 * even if last "marker" byte says it is not.
 				 */
-				final = false;
-				l = strnlen(page, nr_read);
-				if (l < nr_read) {
-					nr_read = l;
-					final = true;
-				}
+				if (c == '\0')
+					nr_write = nr_read;
+				else
+					nr_write = strnlen(page, nr_read);
 
-				if (copy_to_user(buf, page, nr_read)) {
+				if (copy_to_user(buf, page, nr_write)) {
 					rv = -EFAULT;
 					goto out_free_page;
 				}
 
-				p	+= nr_read;
-				len	-= nr_read;
-				buf	+= nr_read;
-				count	-= nr_read;
-				rv	+= nr_read;
+				p	+= nr_write;
+				len	-= nr_write;
+				buf	+= nr_write;
+				count	-= nr_write;
 
-				if (final)
-					goto out_free_page;
+				if (nr_write < nr_read)
+					goto end;
 			}
 
 			/* Only first chunk can be read partially. */
@@ -363,12 +333,13 @@ static ssize_t proc_pid_cmdline_read(struct file *file, char __user *buf,
 		}
 	}
 
+end:
+	*pos += buf - buf0;
+	rv = buf - buf0;
 out_free_page:
 	free_page((unsigned long)page);
 out_mmput:
 	mmput(mm);
-	if (rv > 0)
-		*pos += rv;
 	return rv;
 }
 
@@ -430,7 +401,6 @@ static int proc_pid_stack(struct seq_file *m, struct pid_namespace *ns,
 	struct stack_trace trace;
 	unsigned long *entries;
 	int err;
-	int i;
 
 	entries = kmalloc(MAX_STACK_TRACE_DEPTH * sizeof(*entries), GFP_KERNEL);
 	if (!entries)
@@ -443,6 +413,8 @@ static int proc_pid_stack(struct seq_file *m, struct pid_namespace *ns,
 
 	err = lock_trace(task);
 	if (!err) {
+		unsigned int i;
+
 		save_stack_trace_tsk(task, &trace);
 
 		for (i = 0; i < trace.nr_entries; i++) {
@@ -927,10 +899,10 @@ static ssize_t environ_read(struct file *file, char __user *buf,
 	if (!mmget_not_zero(mm))
 		goto free;
 
-	down_read(&mm->mmap_sem);
+	spin_lock(&mm->arg_lock);
 	env_start = mm->env_start;
 	env_end = mm->env_end;
-	up_read(&mm->mmap_sem);
+	spin_unlock(&mm->arg_lock);
 
 	while (count > 0) {
 		size_t this_len, max_len;
@@ -1784,9 +1756,9 @@ int pid_getattr(const struct path *path, struct kstat *stat,
 
 	generic_fillattr(inode, stat);
 
-	rcu_read_lock();
 	stat->uid = GLOBAL_ROOT_UID;
 	stat->gid = GLOBAL_ROOT_GID;
+	rcu_read_lock();
 	task = pid_task(proc_pid(inode), PIDTYPE_PID);
 	if (task) {
 		if (!has_pid_permissions(pid, task, HIDEPID_INVISIBLE)) {
@@ -1875,7 +1847,7 @@ const struct dentry_operations pid_dentry_operations =
  * by stat.
  */
 bool proc_fill_cache(struct file *file, struct dir_context *ctx,
-	const char *name, int len,
+	const char *name, unsigned int len,
 	instantiate_t instantiate, struct task_struct *task, const void *ptr)
 {
 	struct dentry *child, *dir = file->f_path.dentry;
@@ -3251,7 +3223,7 @@ int proc_pid_readdir(struct file *file, struct dir_context *ctx)
 	     iter.task;
 	     iter.tgid += 1, iter = next_tgid(ns, iter)) {
 		char name[10 + 1];
-		int len;
+		unsigned int len;
 
 		cond_resched();
 		if (!has_pid_permissions(ns, iter.task, HIDEPID_INVISIBLE))
@@ -3578,7 +3550,7 @@ static int proc_task_readdir(struct file *file, struct dir_context *ctx)
 	     task;
 	     task = next_tid(task), ctx->pos++) {
 		char name[10 + 1];
-		int len;
+		unsigned int len;
 		tid = task_pid_nr_ns(task, ns);
 		len = snprintf(name, sizeof(name), "%u", tid);
 		if (!proc_fill_cache(file, ctx, name, len,
diff --git a/fs/proc/fd.c b/fs/proc/fd.c
index 05b9893e9a22..81882a13212d 100644
--- a/fs/proc/fd.c
+++ b/fs/proc/fd.c
@@ -248,7 +248,7 @@ static int proc_readfd_common(struct file *file, struct dir_context *ctx,
 		struct file *f;
 		struct fd_data data;
 		char name[10 + 1];
-		int len;
+		unsigned int len;
 
 		f = fcheck_files(files, fd);
 		if (!f)
diff --git a/fs/proc/internal.h b/fs/proc/internal.h
index 93eb1906c28d..50cb22a08c2f 100644
--- a/fs/proc/internal.h
+++ b/fs/proc/internal.h
@@ -163,7 +163,7 @@ extern loff_t mem_lseek(struct file *, loff_t, int);
 /* Lookups */
 typedef struct dentry *instantiate_t(struct dentry *,
 				     struct task_struct *, const void *);
-extern bool proc_fill_cache(struct file *, struct dir_context *, const char *, int,
+bool proc_fill_cache(struct file *, struct dir_context *, const char *, unsigned int,
 			   instantiate_t, struct task_struct *, const void *);
 
 /*
diff --git a/fs/proc/page.c b/fs/proc/page.c
index 1491918a33c3..792c78a49174 100644
--- a/fs/proc/page.c
+++ b/fs/proc/page.c
@@ -154,6 +154,8 @@ u64 stable_page_flags(struct page *page)
 
 	if (PageBalloon(page))
 		u |= 1 << KPF_BALLOON;
+	if (PageTable(page))
+		u |= 1 << KPF_PGTABLE;
 
 	if (page_is_idle(page))
 		u |= 1 << KPF_IDLE;
diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index 7e074138d2f2..597969db9e90 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -1259,8 +1259,9 @@ static pagemap_entry_t pte_to_pagemap_entry(struct pagemapread *pm,
 		if (pte_swp_soft_dirty(pte))
 			flags |= PM_SOFT_DIRTY;
 		entry = pte_to_swp_entry(pte);
-		frame = swp_type(entry) |
-			(swp_offset(entry) << MAX_SWAPFILES_SHIFT);
+		if (pm->show_pfn)
+			frame = swp_type(entry) |
+				(swp_offset(entry) << MAX_SWAPFILES_SHIFT);
 		flags |= PM_SWAP;
 		if (is_migration_entry(entry))
 			page = migration_entry_to_page(entry);
@@ -1311,11 +1312,14 @@ static int pagemap_pmd_range(pmd_t *pmdp, unsigned long addr, unsigned long end,
 #ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION
 		else if (is_swap_pmd(pmd)) {
 			swp_entry_t entry = pmd_to_swp_entry(pmd);
-			unsigned long offset = swp_offset(entry);
+			unsigned long offset;
 
-			offset += (addr & ~PMD_MASK) >> PAGE_SHIFT;
-			frame = swp_type(entry) |
-				(offset << MAX_SWAPFILES_SHIFT);
+			if (pm->show_pfn) {
+				offset = swp_offset(entry) +
+					((addr & ~PMD_MASK) >> PAGE_SHIFT);
+				frame = swp_type(entry) |
+					(offset << MAX_SWAPFILES_SHIFT);
+			}
 			flags |= PM_SWAP;
 			if (pmd_swp_soft_dirty(pmd))
 				flags |= PM_SOFT_DIRTY;
@@ -1333,10 +1337,12 @@ static int pagemap_pmd_range(pmd_t *pmdp, unsigned long addr, unsigned long end,
 			err = add_to_pagemap(addr, &pme, pm);
 			if (err)
 				break;
-			if (pm->show_pfn && (flags & PM_PRESENT))
-				frame++;
-			else if (flags & PM_SWAP)
-				frame += (1 << MAX_SWAPFILES_SHIFT);
+			if (pm->show_pfn) {
+				if (flags & PM_PRESENT)
+					frame++;
+				else if (flags & PM_SWAP)
+					frame += (1 << MAX_SWAPFILES_SHIFT);
+			}
 		}
 		spin_unlock(ptl);
 		return err;
diff --git a/fs/userfaultfd.c b/fs/userfaultfd.c
index cec550c8468f..123bf7d516fc 100644
--- a/fs/userfaultfd.c
+++ b/fs/userfaultfd.c
@@ -62,6 +62,8 @@ struct userfaultfd_ctx {
 	enum userfaultfd_state state;
 	/* released */
 	bool released;
+	/* memory mappings are changing because of non-cooperative event */
+	bool mmap_changing;
 	/* mm with one ore more vmas attached to this userfaultfd_ctx */
 	struct mm_struct *mm;
 };
@@ -641,6 +643,7 @@ static void userfaultfd_event_wait_completion(struct userfaultfd_ctx *ctx,
 	 * already released.
 	 */
 out:
+	WRITE_ONCE(ctx->mmap_changing, false);
 	userfaultfd_ctx_put(ctx);
 }
 
@@ -686,10 +689,12 @@ int dup_userfaultfd(struct vm_area_struct *vma, struct list_head *fcs)
 		ctx->state = UFFD_STATE_RUNNING;
 		ctx->features = octx->features;
 		ctx->released = false;
+		ctx->mmap_changing = false;
 		ctx->mm = vma->vm_mm;
 		mmgrab(ctx->mm);
 
 		userfaultfd_ctx_get(octx);
+		WRITE_ONCE(octx->mmap_changing, true);
 		fctx->orig = octx;
 		fctx->new = ctx;
 		list_add_tail(&fctx->list, fcs);
@@ -732,6 +737,7 @@ void mremap_userfaultfd_prep(struct vm_area_struct *vma,
 	if (ctx && (ctx->features & UFFD_FEATURE_EVENT_REMAP)) {
 		vm_ctx->ctx = ctx;
 		userfaultfd_ctx_get(ctx);
+		WRITE_ONCE(ctx->mmap_changing, true);
 	}
 }
 
@@ -772,6 +778,7 @@ bool userfaultfd_remove(struct vm_area_struct *vma,
 		return true;
 
 	userfaultfd_ctx_get(ctx);
+	WRITE_ONCE(ctx->mmap_changing, true);
 	up_read(&mm->mmap_sem);
 
 	msg_init(&ewq.msg);
@@ -815,6 +822,7 @@ int userfaultfd_unmap_prep(struct vm_area_struct *vma,
 			return -ENOMEM;
 
 		userfaultfd_ctx_get(ctx);
+		WRITE_ONCE(ctx->mmap_changing, true);
 		unmap_ctx->ctx = ctx;
 		unmap_ctx->start = start;
 		unmap_ctx->end = end;
@@ -1653,6 +1661,10 @@ static int userfaultfd_copy(struct userfaultfd_ctx *ctx,
 
 	user_uffdio_copy = (struct uffdio_copy __user *) arg;
 
+	ret = -EAGAIN;
+	if (READ_ONCE(ctx->mmap_changing))
+		goto out;
+
 	ret = -EFAULT;
 	if (copy_from_user(&uffdio_copy, user_uffdio_copy,
 			   /* don't copy "copy" last field */
@@ -1674,7 +1686,7 @@ static int userfaultfd_copy(struct userfaultfd_ctx *ctx,
 		goto out;
 	if (mmget_not_zero(ctx->mm)) {
 		ret = mcopy_atomic(ctx->mm, uffdio_copy.dst, uffdio_copy.src,
-				   uffdio_copy.len);
+				   uffdio_copy.len, &ctx->mmap_changing);
 		mmput(ctx->mm);
 	} else {
 		return -ESRCH;
@@ -1705,6 +1717,10 @@ static int userfaultfd_zeropage(struct userfaultfd_ctx *ctx,
 
 	user_uffdio_zeropage = (struct uffdio_zeropage __user *) arg;
 
+	ret = -EAGAIN;
+	if (READ_ONCE(ctx->mmap_changing))
+		goto out;
+
 	ret = -EFAULT;
 	if (copy_from_user(&uffdio_zeropage, user_uffdio_zeropage,
 			   /* don't copy "zeropage" last field */
@@ -1721,7 +1737,8 @@ static int userfaultfd_zeropage(struct userfaultfd_ctx *ctx,
 
 	if (mmget_not_zero(ctx->mm)) {
 		ret = mfill_zeropage(ctx->mm, uffdio_zeropage.range.start,
-				     uffdio_zeropage.range.len);
+				     uffdio_zeropage.range.len,
+				     &ctx->mmap_changing);
 		mmput(ctx->mm);
 	} else {
 		return -ESRCH;
@@ -1900,6 +1917,7 @@ SYSCALL_DEFINE1(userfaultfd, int, flags)
 	ctx->features = 0;
 	ctx->state = UFFD_STATE_WAIT_API;
 	ctx->released = false;
+	ctx->mmap_changing = false;
 	ctx->mm = current->mm;
 	/* prevent the mm struct to be freed */
 	mmgrab(ctx->mm);
author	Linus Torvalds <torvalds@linux-foundation.org>	2018-06-07 18:39:37 -0700
committer	Linus Torvalds <torvalds@linux-foundation.org>	2018-06-07 18:39:37 -0700
commit	68abbe729567cef128b2c2141f2ed2567f3b8372 (patch)
tree	aa75c39cc815eee4d7cc8db2988fe10879fccd3e /fs
parent	ba1b7309fc2e909a5828c36a7cd187e5d7df6f53 (diff)
parent	016e92da037e0b43dd5e5848c19b0b9749506963 (diff)
download	linux-68abbe729567cef128b2c2141f2ed2567f3b8372.tar.bz2