Merge branch 'work.mount3' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

Pull more mount API conversions from Al Viro:
 "Assorted conversions of options parsing to new API.

  gfs2 is probably the most serious one here; the rest is trivial stuff.

  Other things in what used to be #work.mount are going to wait for the
  next cycle (and preferably go via git trees of the filesystems
  involved)"

* 'work.mount3' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  gfs2: Convert gfs2 to fs_context
  vfs: Convert spufs to use the new mount API
  vfs: Convert hypfs to use the new mount API
  hypfs: Fix error number left in struct pointer member
  vfs: Convert functionfs to use the new mount API
  vfs: Convert bpf to use the new mount API

8 files changed, 749 insertions, 759 deletions

diff --git a/arch/powerpc/platforms/cell/spufs/inode.c b/arch/powerpc/platforms/cell/spufs/inode.c
index 065ff14b76e1..1d93e55a2de1 100644
--- a/arch/powerpc/platforms/cell/spufs/inode.c
+++ b/arch/powerpc/platforms/cell/spufs/inode.c
@@ -10,6 +10,8 @@
 
 #include <linux/file.h>
 #include <linux/fs.h>
+#include <linux/fs_context.h>
+#include <linux/fs_parser.h>
 #include <linux/fsnotify.h>
 #include <linux/backing-dev.h>
 #include <linux/init.h>
@@ -20,7 +22,6 @@
 #include <linux/pagemap.h>
 #include <linux/poll.h>
 #include <linux/slab.h>
-#include <linux/parser.h>
 
 #include <asm/prom.h>
 #include <asm/spu.h>
@@ -30,7 +31,7 @@
 #include "spufs.h"
 
 struct spufs_sb_info {
-	int debug;
+	bool debug;
 };
 
 static struct kmem_cache *spufs_inode_cache;
@@ -574,16 +575,27 @@ long spufs_create(struct path *path, struct dentry *dentry,
 }
 
 /* File system initialization */
+struct spufs_fs_context {
+	kuid_t	uid;
+	kgid_t	gid;
+	umode_t	mode;
+};
+
 enum {
-	Opt_uid, Opt_gid, Opt_mode, Opt_debug, Opt_err,
+	Opt_uid, Opt_gid, Opt_mode, Opt_debug,
+};
+
+static const struct fs_parameter_spec spufs_param_specs[] = {
+	fsparam_u32	("gid",				Opt_gid),
+	fsparam_u32oct	("mode",			Opt_mode),
+	fsparam_u32	("uid",				Opt_uid),
+	fsparam_flag	("debug",			Opt_debug),
+	{}
 };
 
-static const match_table_t spufs_tokens = {
-	{ Opt_uid,   "uid=%d" },
-	{ Opt_gid,   "gid=%d" },
-	{ Opt_mode,  "mode=%o" },
-	{ Opt_debug, "debug" },
-	{ Opt_err,    NULL  },
+static const struct fs_parameter_description spufs_fs_parameters = {
+	.name		= "spufs",
+	.specs		= spufs_param_specs,
 };
 
 static int spufs_show_options(struct seq_file *m, struct dentry *root)
@@ -604,47 +616,41 @@ static int spufs_show_options(struct seq_file *m, struct dentry *root)
 	return 0;
 }
 
-static int
-spufs_parse_options(struct super_block *sb, char *options, struct inode *root)
-{
-	char *p;
-	substring_t args[MAX_OPT_ARGS];
-
-	while ((p = strsep(&options, ",")) != NULL) {
-		int token, option;
-
-		if (!*p)
-			continue;
-
-		token = match_token(p, spufs_tokens, args);
-		switch (token) {
-		case Opt_uid:
-			if (match_int(&args[0], &option))
-				return 0;
-			root->i_uid = make_kuid(current_user_ns(), option);
-			if (!uid_valid(root->i_uid))
-				return 0;
-			break;
-		case Opt_gid:
-			if (match_int(&args[0], &option))
-				return 0;
-			root->i_gid = make_kgid(current_user_ns(), option);
-			if (!gid_valid(root->i_gid))
-				return 0;
-			break;
-		case Opt_mode:
-			if (match_octal(&args[0], &option))
-				return 0;
-			root->i_mode = option | S_IFDIR;
-			break;
-		case Opt_debug:
-			spufs_get_sb_info(sb)->debug = 1;
-			break;
-		default:
-			return 0;
-		}
+static int spufs_parse_param(struct fs_context *fc, struct fs_parameter *param)
+{
+	struct spufs_fs_context *ctx = fc->fs_private;
+	struct spufs_sb_info *sbi = fc->s_fs_info;
+	struct fs_parse_result result;
+	kuid_t uid;
+	kgid_t gid;
+	int opt;
+
+	opt = fs_parse(fc, &spufs_fs_parameters, param, &result);
+	if (opt < 0)
+		return opt;
+
+	switch (opt) {
+	case Opt_uid:
+		uid = make_kuid(current_user_ns(), result.uint_32);
+		if (!uid_valid(uid))
+			return invalf(fc, "Unknown uid");
+		ctx->uid = uid;
+		break;
+	case Opt_gid:
+		gid = make_kgid(current_user_ns(), result.uint_32);
+		if (!gid_valid(gid))
+			return invalf(fc, "Unknown gid");
+		ctx->gid = gid;
+		break;
+	case Opt_mode:
+		ctx->mode = result.uint_32 & S_IALLUGO;
+		break;
+	case Opt_debug:
+		sbi->debug = true;
+		break;
 	}
-	return 1;
+
+	return 0;
 }
 
 static void spufs_exit_isolated_loader(void)
@@ -678,79 +684,98 @@ spufs_init_isolated_loader(void)
 	printk(KERN_INFO "spufs: SPU isolation mode enabled\n");
 }
 
-static int
-spufs_create_root(struct super_block *sb, void *data)
+static int spufs_create_root(struct super_block *sb, struct fs_context *fc)
 {
+	struct spufs_fs_context *ctx = fc->fs_private;
 	struct inode *inode;
-	int ret;
 
-	ret = -ENODEV;
 	if (!spu_management_ops)
-		goto out;
+		return -ENODEV;
 
-	ret = -ENOMEM;
-	inode = spufs_new_inode(sb, S_IFDIR | 0775);
+	inode = spufs_new_inode(sb, S_IFDIR | ctx->mode);
 	if (!inode)
-		goto out;
+		return -ENOMEM;
 
+	inode->i_uid = ctx->uid;
+	inode->i_gid = ctx->gid;
 	inode->i_op = &simple_dir_inode_operations;
 	inode->i_fop = &simple_dir_operations;
 	SPUFS_I(inode)->i_ctx = NULL;
 	inc_nlink(inode);
 
-	ret = -EINVAL;
-	if (!spufs_parse_options(sb, data, inode))
-		goto out_iput;
-
-	ret = -ENOMEM;
 	sb->s_root = d_make_root(inode);
 	if (!sb->s_root)
-		goto out;
-
+		return -ENOMEM;
 	return 0;
-out_iput:
-	iput(inode);
-out:
-	return ret;
 }
 
-static int
-spufs_fill_super(struct super_block *sb, void *data, int silent)
-{
-	struct spufs_sb_info *info;
-	static const struct super_operations s_ops = {
-		.alloc_inode = spufs_alloc_inode,
-		.free_inode = spufs_free_inode,
-		.statfs = simple_statfs,
-		.evict_inode = spufs_evict_inode,
-		.show_options = spufs_show_options,
-	};
-
-	info = kzalloc(sizeof(*info), GFP_KERNEL);
-	if (!info)
-		return -ENOMEM;
+static const struct super_operations spufs_ops = {
+	.alloc_inode	= spufs_alloc_inode,
+	.free_inode	= spufs_free_inode,
+	.statfs		= simple_statfs,
+	.evict_inode	= spufs_evict_inode,
+	.show_options	= spufs_show_options,
+};
 
+static int spufs_fill_super(struct super_block *sb, struct fs_context *fc)
+{
 	sb->s_maxbytes = MAX_LFS_FILESIZE;
 	sb->s_blocksize = PAGE_SIZE;
 	sb->s_blocksize_bits = PAGE_SHIFT;
 	sb->s_magic = SPUFS_MAGIC;
-	sb->s_op = &s_ops;
-	sb->s_fs_info = info;
+	sb->s_op = &spufs_ops;
 
-	return spufs_create_root(sb, data);
+	return spufs_create_root(sb, fc);
+}
+
+static int spufs_get_tree(struct fs_context *fc)
+{
+	return get_tree_single(fc, spufs_fill_super);
 }
 
-static struct dentry *
-spufs_mount(struct file_system_type *fstype, int flags,
-		const char *name, void *data)
+static void spufs_free_fc(struct fs_context *fc)
 {
-	return mount_single(fstype, flags, data, spufs_fill_super);
+	kfree(fc->s_fs_info);
+}
+
+static const struct fs_context_operations spufs_context_ops = {
+	.free		= spufs_free_fc,
+	.parse_param	= spufs_parse_param,
+	.get_tree	= spufs_get_tree,
+};
+
+static int spufs_init_fs_context(struct fs_context *fc)
+{
+	struct spufs_fs_context *ctx;
+	struct spufs_sb_info *sbi;
+
+	ctx = kzalloc(sizeof(struct spufs_fs_context), GFP_KERNEL);
+	if (!ctx)
+		goto nomem;
+
+	sbi = kzalloc(sizeof(struct spufs_sb_info), GFP_KERNEL);
+	if (!sbi)
+		goto nomem_ctx;
+
+	ctx->uid = current_uid();
+	ctx->gid = current_gid();
+	ctx->mode = 0755;
+
+	fc->s_fs_info = sbi;
+	fc->ops = &spufs_context_ops;
+	return 0;
+
+nomem_ctx:
+	kfree(ctx);
+nomem:
+	return -ENOMEM;
 }
 
 static struct file_system_type spufs_type = {
 	.owner = THIS_MODULE,
 	.name = "spufs",
-	.mount = spufs_mount,
+	.init_fs_context = spufs_init_fs_context,
+	.parameters	= &spufs_fs_parameters,
 	.kill_sb = kill_litter_super,
 };
 MODULE_ALIAS_FS("spufs");
diff --git a/arch/s390/hypfs/inode.c b/arch/s390/hypfs/inode.c
index a4418fc425b8..70139d0791b6 100644
--- a/arch/s390/hypfs/inode.c
+++ b/arch/s390/hypfs/inode.c
@@ -12,17 +12,17 @@
 #include <linux/types.h>
 #include <linux/errno.h>
 #include <linux/fs.h>
+#include <linux/fs_context.h>
+#include <linux/fs_parser.h>
 #include <linux/namei.h>
 #include <linux/vfs.h>
 #include <linux/slab.h>
 #include <linux/pagemap.h>
 #include <linux/time.h>
-#include <linux/parser.h>
 #include <linux/sysfs.h>
 #include <linux/init.h>
 #include <linux/kobject.h>
 #include <linux/seq_file.h>
-#include <linux/mount.h>
 #include <linux/uio.h>
 #include <asm/ebcdic.h>
 #include "hypfs.h"
@@ -207,52 +207,44 @@ static int hypfs_release(struct inode *inode, struct file *filp)
 	return 0;
 }
 
-enum { opt_uid, opt_gid, opt_err };
+enum { Opt_uid, Opt_gid, };
 
-static const match_table_t hypfs_tokens = {
-	{opt_uid, "uid=%u"},
-	{opt_gid, "gid=%u"},
-	{opt_err, NULL}
+static const struct fs_parameter_spec hypfs_param_specs[] = {
+	fsparam_u32("gid", Opt_gid),
+	fsparam_u32("uid", Opt_uid),
+	{}
 };
 
-static int hypfs_parse_options(char *options, struct super_block *sb)
+static const struct fs_parameter_description hypfs_fs_parameters = {
+	.name		= "hypfs",
+	.specs		= hypfs_param_specs,
+};
+
+static int hypfs_parse_param(struct fs_context *fc, struct fs_parameter *param)
 {
-	char *str;
-	substring_t args[MAX_OPT_ARGS];
+	struct hypfs_sb_info *hypfs_info = fc->s_fs_info;
+	struct fs_parse_result result;
 	kuid_t uid;
 	kgid_t gid;
-
-	if (!options)
-		return 0;
-	while ((str = strsep(&options, ",")) != NULL) {
-		int token, option;
-		struct hypfs_sb_info *hypfs_info = sb->s_fs_info;
-
-		if (!*str)
-			continue;
-		token = match_token(str, hypfs_tokens, args);
-		switch (token) {
-		case opt_uid:
-			if (match_int(&args[0], &option))
-				return -EINVAL;
-			uid = make_kuid(current_user_ns(), option);
-			if (!uid_valid(uid))
-				return -EINVAL;
-			hypfs_info->uid = uid;
-			break;
-		case opt_gid:
-			if (match_int(&args[0], &option))
-				return -EINVAL;
-			gid = make_kgid(current_user_ns(), option);
-			if (!gid_valid(gid))
-				return -EINVAL;
-			hypfs_info->gid = gid;
-			break;
-		case opt_err:
-		default:
-			pr_err("%s is not a valid mount option\n", str);
-			return -EINVAL;
-		}
+	int opt;
+
+	opt = fs_parse(fc, &hypfs_fs_parameters, param, &result);
+	if (opt < 0)
+		return opt;
+
+	switch (opt) {
+	case Opt_uid:
+		uid = make_kuid(current_user_ns(), result.uint_32);
+		if (!uid_valid(uid))
+			return invalf(fc, "Unknown uid");
+		hypfs_info->uid = uid;
+		break;
+	case Opt_gid:
+		gid = make_kgid(current_user_ns(), result.uint_32);
+		if (!gid_valid(gid))
+			return invalf(fc, "Unknown gid");
+		hypfs_info->gid = gid;
+		break;
 	}
 	return 0;
 }
@@ -266,26 +258,18 @@ static int hypfs_show_options(struct seq_file *s, struct dentry *root)
 	return 0;
 }
 
-static int hypfs_fill_super(struct super_block *sb, void *data, int silent)
+static int hypfs_fill_super(struct super_block *sb, struct fs_context *fc)
 {
+	struct hypfs_sb_info *sbi = sb->s_fs_info;
 	struct inode *root_inode;
-	struct dentry *root_dentry;
-	int rc = 0;
-	struct hypfs_sb_info *sbi;
+	struct dentry *root_dentry, *update_file;
+	int rc;
 
-	sbi = kzalloc(sizeof(struct hypfs_sb_info), GFP_KERNEL);
-	if (!sbi)
-		return -ENOMEM;
-	mutex_init(&sbi->lock);
-	sbi->uid = current_uid();
-	sbi->gid = current_gid();
-	sb->s_fs_info = sbi;
 	sb->s_blocksize = PAGE_SIZE;
 	sb->s_blocksize_bits = PAGE_SHIFT;
 	sb->s_magic = HYPFS_MAGIC;
 	sb->s_op = &hypfs_s_ops;
-	if (hypfs_parse_options(data, sb))
-		return -EINVAL;
+
 	root_inode = hypfs_make_inode(sb, S_IFDIR | 0755);
 	if (!root_inode)
 		return -ENOMEM;
@@ -300,18 +284,46 @@ static int hypfs_fill_super(struct super_block *sb, void *data, int silent)
 		rc = hypfs_diag_create_files(root_dentry);
 	if (rc)
 		return rc;
-	sbi->update_file = hypfs_create_update_file(root_dentry);
-	if (IS_ERR(sbi->update_file))
-		return PTR_ERR(sbi->update_file);
+	update_file = hypfs_create_update_file(root_dentry);
+	if (IS_ERR(update_file))
+		return PTR_ERR(update_file);
+	sbi->update_file = update_file;
 	hypfs_update_update(sb);
 	pr_info("Hypervisor filesystem mounted\n");
 	return 0;
 }
 
-static struct dentry *hypfs_mount(struct file_system_type *fst, int flags,
-			const char *devname, void *data)
+static int hypfs_get_tree(struct fs_context *fc)
+{
+	return get_tree_single(fc, hypfs_fill_super);
+}
+
+static void hypfs_free_fc(struct fs_context *fc)
 {
-	return mount_single(fst, flags, data, hypfs_fill_super);
+	kfree(fc->s_fs_info);
+}
+
+static const struct fs_context_operations hypfs_context_ops = {
+	.free		= hypfs_free_fc,
+	.parse_param	= hypfs_parse_param,
+	.get_tree	= hypfs_get_tree,
+};
+
+static int hypfs_init_fs_context(struct fs_context *fc)
+{
+	struct hypfs_sb_info *sbi;
+
+	sbi = kzalloc(sizeof(struct hypfs_sb_info), GFP_KERNEL);
+	if (!sbi)
+		return -ENOMEM;
+
+	mutex_init(&sbi->lock);
+	sbi->uid = current_uid();
+	sbi->gid = current_gid();
+
+	fc->s_fs_info = sbi;
+	fc->ops = &hypfs_context_ops;
+	return 0;
 }
 
 static void hypfs_kill_super(struct super_block *sb)
@@ -442,7 +454,8 @@ static const struct file_operations hypfs_file_ops = {
 static struct file_system_type hypfs_type = {
 	.owner		= THIS_MODULE,
 	.name		= "s390_hypfs",
-	.mount		= hypfs_mount,
+	.init_fs_context = hypfs_init_fs_context,
+	.parameters	= &hypfs_fs_parameters,
 	.kill_sb	= hypfs_kill_super
 };
 
diff --git a/drivers/usb/gadget/function/f_fs.c b/drivers/usb/gadget/function/f_fs.c
index 213ff03c8a9f..59d9d512dcda 100644
--- a/drivers/usb/gadget/function/f_fs.c
+++ b/drivers/usb/gadget/function/f_fs.c
@@ -17,6 +17,7 @@
 #include <linux/blkdev.h>
 #include <linux/pagemap.h>
 #include <linux/export.h>
+#include <linux/fs_parser.h>
 #include <linux/hid.h>
 #include <linux/mm.h>
 #include <linux/module.h>
@@ -1451,9 +1452,9 @@ struct ffs_sb_fill_data {
 	struct ffs_data *ffs_data;
 };
 
-static int ffs_sb_fill(struct super_block *sb, void *_data, int silent)
+static int ffs_sb_fill(struct super_block *sb, struct fs_context *fc)
 {
-	struct ffs_sb_fill_data *data = _data;
+	struct ffs_sb_fill_data *data = fc->fs_private;
 	struct inode	*inode;
 	struct ffs_data	*ffs = data->ffs_data;
 
@@ -1486,147 +1487,152 @@ static int ffs_sb_fill(struct super_block *sb, void *_data, int silent)
 	return 0;
 }
 
-static int ffs_fs_parse_opts(struct ffs_sb_fill_data *data, char *opts)
-{
-	ENTER();
+enum {
+	Opt_no_disconnect,
+	Opt_rmode,
+	Opt_fmode,
+	Opt_mode,
+	Opt_uid,
+	Opt_gid,
+};
 
-	if (!opts || !*opts)
-		return 0;
+static const struct fs_parameter_spec ffs_fs_param_specs[] = {
+	fsparam_bool	("no_disconnect",	Opt_no_disconnect),
+	fsparam_u32	("rmode",		Opt_rmode),
+	fsparam_u32	("fmode",		Opt_fmode),
+	fsparam_u32	("mode",		Opt_mode),
+	fsparam_u32	("uid",			Opt_uid),
+	fsparam_u32	("gid",			Opt_gid),
+	{}
+};
 
-	for (;;) {
-		unsigned long value;
-		char *eq, *comma;
-
-		/* Option limit */
-		comma = strchr(opts, ',');
-		if (comma)
-			*comma = 0;
-
-		/* Value limit */
-		eq = strchr(opts, '=');
-		if (unlikely(!eq)) {
-			pr_err("'=' missing in %s\n", opts);
-			return -EINVAL;
-		}
-		*eq = 0;
+static const struct fs_parameter_description ffs_fs_fs_parameters = {
+	.name		= "kAFS",
+	.specs		= ffs_fs_param_specs,
+};
 
-		/* Parse value */
-		if (kstrtoul(eq + 1, 0, &value)) {
-			pr_err("%s: invalid value: %s\n", opts, eq + 1);
-			return -EINVAL;
-		}
+static int ffs_fs_parse_param(struct fs_context *fc, struct fs_parameter *param)
+{
+	struct ffs_sb_fill_data *data = fc->fs_private;
+	struct fs_parse_result result;
+	int opt;
 
-		/* Interpret option */
-		switch (eq - opts) {
-		case 13:
-			if (!memcmp(opts, "no_disconnect", 13))
-				data->no_disconnect = !!value;
-			else
-				goto invalid;
-			break;
-		case 5:
-			if (!memcmp(opts, "rmode", 5))
-				data->root_mode  = (value & 0555) | S_IFDIR;
-			else if (!memcmp(opts, "fmode", 5))
-				data->perms.mode = (value & 0666) | S_IFREG;
-			else
-				goto invalid;
-			break;
+	ENTER();
 
-		case 4:
-			if (!memcmp(opts, "mode", 4)) {
-				data->root_mode  = (value & 0555) | S_IFDIR;
-				data->perms.mode = (value & 0666) | S_IFREG;
-			} else {
-				goto invalid;
-			}
-			break;
+	opt = fs_parse(fc, &ffs_fs_fs_parameters, param, &result);
+	if (opt < 0)
+		return opt;
 
-		case 3:
-			if (!memcmp(opts, "uid", 3)) {
-				data->perms.uid = make_kuid(current_user_ns(), value);
-				if (!uid_valid(data->perms.uid)) {
-					pr_err("%s: unmapped value: %lu\n", opts, value);
-					return -EINVAL;
-				}
-			} else if (!memcmp(opts, "gid", 3)) {
-				data->perms.gid = make_kgid(current_user_ns(), value);
-				if (!gid_valid(data->perms.gid)) {
-					pr_err("%s: unmapped value: %lu\n", opts, value);
-					return -EINVAL;
-				}
-			} else {
-				goto invalid;
-			}
-			break;
+	switch (opt) {
+	case Opt_no_disconnect:
+		data->no_disconnect = result.boolean;
+		break;
+	case Opt_rmode:
+		data->root_mode  = (result.uint_32 & 0555) | S_IFDIR;
+		break;
+	case Opt_fmode:
+		data->perms.mode = (result.uint_32 & 0666) | S_IFREG;
+		break;
+	case Opt_mode:
+		data->root_mode  = (result.uint_32 & 0555) | S_IFDIR;
+		data->perms.mode = (result.uint_32 & 0666) | S_IFREG;
+		break;
 
-		default:
-invalid:
-			pr_err("%s: invalid option\n", opts);
-			return -EINVAL;
-		}
+	case Opt_uid:
+		data->perms.uid = make_kuid(current_user_ns(), result.uint_32);
+		if (!uid_valid(data->perms.uid))
+			goto unmapped_value;
+		break;
+	case Opt_gid:
+		data->perms.gid = make_kgid(current_user_ns(), result.uint_32);
+		if (!gid_valid(data->perms.gid))
+			goto unmapped_value;
+		break;
 
-		/* Next iteration */
-		if (!comma)
-			break;
-		opts = comma + 1;
+	default:
+		return -ENOPARAM;
 	}
 
 	return 0;
-}
 
-/* "mount -t functionfs dev_name /dev/function" ends up here */
+unmapped_value:
+	return invalf(fc, "%s: unmapped value: %u", param->key, result.uint_32);
+}
 
-static struct dentry *
-ffs_fs_mount(struct file_system_type *t, int flags,
-	      const char *dev_name, void *opts)
-{
-	struct ffs_sb_fill_data data = {
-		.perms = {
-			.mode = S_IFREG | 0600,
-			.uid = GLOBAL_ROOT_UID,
-			.gid = GLOBAL_ROOT_GID,
-		},
-		.root_mode = S_IFDIR | 0500,
-		.no_disconnect = false,
-	};
-	struct dentry *rv;
-	int ret;
+/*
+ * Set up the superblock for a mount.
+ */
+static int ffs_fs_get_tree(struct fs_context *fc)
+{
+	struct ffs_sb_fill_data *ctx = fc->fs_private;
 	void *ffs_dev;
 	struct ffs_data	*ffs;
 
 	ENTER();
 
-	ret = ffs_fs_parse_opts(&data, opts);
-	if (unlikely(ret < 0))
-		return ERR_PTR(ret);
+	if (!fc->source)
+		return invalf(fc, "No source specified");
 
-	ffs = ffs_data_new(dev_name);
+	ffs = ffs_data_new(fc->source);
 	if (unlikely(!ffs))
-		return ERR_PTR(-ENOMEM);
-	ffs->file_perms = data.perms;
-	ffs->no_disconnect = data.no_disconnect;
+		return -ENOMEM;
+	ffs->file_perms = ctx->perms;
+	ffs->no_disconnect = ctx->no_disconnect;
 
-	ffs->dev_name = kstrdup(dev_name, GFP_KERNEL);
+	ffs->dev_name = kstrdup(fc->source, GFP_KERNEL);
 	if (unlikely(!ffs->dev_name)) {
 		ffs_data_put(ffs);
-		return ERR_PTR(-ENOMEM);
+		return -ENOMEM;
 	}
 
-	ffs_dev = ffs_acquire_dev(dev_name);
+	ffs_dev = ffs_acquire_dev(ffs->dev_name);
 	if (IS_ERR(ffs_dev)) {
 		ffs_data_put(ffs);
-		return ERR_CAST(ffs_dev);
+		return PTR_ERR(ffs_dev);
 	}
+
 	ffs->private_data = ffs_dev;
-	data.ffs_data = ffs;
+	ctx->ffs_data = ffs;
+	return get_tree_nodev(fc, ffs_sb_fill);
+}
+
+static void ffs_fs_free_fc(struct fs_context *fc)
+{
+	struct ffs_sb_fill_data *ctx = fc->fs_private;
+
+	if (ctx) {
+		if (ctx->ffs_data) {
+			ffs_release_dev(ctx->ffs_data);
+			ffs_data_put(ctx->ffs_data);
+		}
 
-	rv = mount_nodev(t, flags, &data, ffs_sb_fill);
-	if (IS_ERR(rv) && data.ffs_data) {
-		ffs_release_dev(data.ffs_data);
-		ffs_data_put(data.ffs_data);
+		kfree(ctx);
 	}
-	return rv;
+}
+
+static const struct fs_context_operations ffs_fs_context_ops = {
+	.free		= ffs_fs_free_fc,
+	.parse_param	= ffs_fs_parse_param,
+	.get_tree	= ffs_fs_get_tree,
+};
+
+static int ffs_fs_init_fs_context(struct fs_context *fc)
+{
+	struct ffs_sb_fill_data *ctx;
+
+	ctx = kzalloc(sizeof(struct ffs_sb_fill_data), GFP_KERNEL);
+	if (!ctx)
+		return -ENOMEM;
+
+	ctx->perms.mode = S_IFREG | 0600;
+	ctx->perms.uid = GLOBAL_ROOT_UID;
+	ctx->perms.gid = GLOBAL_ROOT_GID;
+	ctx->root_mode = S_IFDIR | 0500;
+	ctx->no_disconnect = false;
+
+	fc->fs_private = ctx;
+	fc->ops = &ffs_fs_context_ops;
+	return 0;
 }
 
 static void
@@ -1644,7 +1650,8 @@ ffs_fs_kill_sb(struct super_block *sb)
 static struct file_system_type ffs_fs_type = {
 	.owner		= THIS_MODULE,
 	.name		= "functionfs",
-	.mount		= ffs_fs_mount,
+	.init_fs_context = ffs_fs_init_fs_context,
+	.parameters	= &ffs_fs_fs_parameters,
 	.kill_sb	= ffs_fs_kill_sb,
 };
 MODULE_ALIAS_FS("functionfs");
diff --git a/fs/gfs2/incore.h b/fs/gfs2/incore.h
index 6b450065b9d5..5f89c515f5bb 100644
--- a/fs/gfs2/incore.h
+++ b/fs/gfs2/incore.h
@@ -584,10 +584,10 @@ struct gfs2_args {
 	unsigned int ar_rgrplvb:1;		/* use lvbs for rgrp info */
 	unsigned int ar_loccookie:1;		/* use location based readdir
 						   cookies */
-	int ar_commit;				/* Commit interval */
-	int ar_statfs_quantum;			/* The fast statfs interval */
-	int ar_quota_quantum;			/* The quota interval */
-	int ar_statfs_percent;			/* The % change to force sync */
+	s32 ar_commit;				/* Commit interval */
+	s32 ar_statfs_quantum;			/* The fast statfs interval */
+	s32 ar_quota_quantum;			/* The quota interval */
+	s32 ar_statfs_percent;			/* The % change to force sync */
 };
 
 struct gfs2_tune {
diff --git a/fs/gfs2/ops_fstype.c b/fs/gfs2/ops_fstype.c
index f3fd5cd9d43f..681b44682b0d 100644
--- a/fs/gfs2/ops_fstype.c
+++ b/fs/gfs2/ops_fstype.c
@@ -21,6 +21,7 @@
 #include <linux/lockdep.h>
 #include <linux/module.h>
 #include <linux/backing-dev.h>
+#include <linux/fs_parser.h>
 
 #include "gfs2.h"
 #include "incore.h"
@@ -1031,16 +1032,17 @@ void gfs2_online_uevent(struct gfs2_sbd *sdp)
 }
 
 /**
- * fill_super - Read in superblock
+ * gfs2_fill_super - Read in superblock
  * @sb: The VFS superblock
- * @data: Mount options
+ * @args: Mount options
  * @silent: Don't complain if it's not a GFS2 filesystem
  *
- * Returns: errno
+ * Returns: -errno
  */
-
-static int fill_super(struct super_block *sb, struct gfs2_args *args, int silent)
+static int gfs2_fill_super(struct super_block *sb, struct fs_context *fc)
 {
+	struct gfs2_args *args = fc->fs_private;
+	int silent = fc->sb_flags & SB_SILENT;
 	struct gfs2_sbd *sdp;
 	struct gfs2_holder mount_gh;
 	int error;
@@ -1205,161 +1207,411 @@ fail_debug:
 	return error;
 }
 
-static int set_gfs2_super(struct super_block *s, void *data)
+/**
+ * gfs2_get_tree - Get the GFS2 superblock and root directory
+ * @fc: The filesystem context
+ *
+ * Returns: 0 or -errno on error
+ */
+static int gfs2_get_tree(struct fs_context *fc)
 {
-	s->s_bdev = data;
-	s->s_dev = s->s_bdev->bd_dev;
-	s->s_bdi = bdi_get(s->s_bdev->bd_bdi);
+	struct gfs2_args *args = fc->fs_private;
+	struct gfs2_sbd *sdp;
+	int error;
+
+	error = get_tree_bdev(fc, gfs2_fill_super);
+	if (error)
+		return error;
+
+	sdp = fc->root->d_sb->s_fs_info;
+	dput(fc->root);
+	if (args->ar_meta)
+		fc->root = dget(sdp->sd_master_dir);
+	else
+		fc->root = dget(sdp->sd_root_dir);
 	return 0;
 }
 
-static int test_gfs2_super(struct super_block *s, void *ptr)
+static void gfs2_fc_free(struct fs_context *fc)
 {
-	struct block_device *bdev = ptr;
-	return (bdev == s->s_bdev);
+	struct gfs2_args *args = fc->fs_private;
+
+	kfree(args);
 }
 
-/**
- * gfs2_mount - Get the GFS2 superblock
- * @fs_type: The GFS2 filesystem type
- * @flags: Mount flags
- * @dev_name: The name of the device
- * @data: The mount arguments
- *
- * Q. Why not use get_sb_bdev() ?
- * A. We need to select one of two root directories to mount, independent
- *    of whether this is the initial, or subsequent, mount of this sb
- *
- * Returns: 0 or -ve on error
- */
+enum gfs2_param {
+	Opt_lockproto,
+	Opt_locktable,
+	Opt_hostdata,
+	Opt_spectator,
+	Opt_ignore_local_fs,
+	Opt_localflocks,
+	Opt_localcaching,
+	Opt_debug,
+	Opt_upgrade,
+	Opt_acl,
+	Opt_quota,
+	Opt_suiddir,
+	Opt_data,
+	Opt_meta,
+	Opt_discard,
+	Opt_commit,
+	Opt_errors,
+	Opt_statfs_quantum,
+	Opt_statfs_percent,
+	Opt_quota_quantum,
+	Opt_barrier,
+	Opt_rgrplvb,
+	Opt_loccookie,
+};
 
-static struct dentry *gfs2_mount(struct file_system_type *fs_type, int flags,
-		       const char *dev_name, void *data)
-{
-	struct block_device *bdev;
-	struct super_block *s;
-	fmode_t mode = FMODE_READ | FMODE_EXCL;
-	int error;
-	struct gfs2_args args;
-	struct gfs2_sbd *sdp;
+enum opt_quota {
+	Opt_quota_unset = 0,
+	Opt_quota_off,
+	Opt_quota_account,
+	Opt_quota_on,
+};
+
+static const unsigned int opt_quota_values[] = {
+	[Opt_quota_off]     = GFS2_QUOTA_OFF,
+	[Opt_quota_account] = GFS2_QUOTA_ACCOUNT,
+	[Opt_quota_on]      = GFS2_QUOTA_ON,
+};
 
-	if (!(flags & SB_RDONLY))
-		mode |= FMODE_WRITE;
+enum opt_data {
+	Opt_data_writeback = GFS2_DATA_WRITEBACK,
+	Opt_data_ordered   = GFS2_DATA_ORDERED,
+};
 
-	bdev = blkdev_get_by_path(dev_name, mode, fs_type);
-	if (IS_ERR(bdev))
-		return ERR_CAST(bdev);
+enum opt_errors {
+	Opt_errors_withdraw = GFS2_ERRORS_WITHDRAW,
+	Opt_errors_panic    = GFS2_ERRORS_PANIC,
+};
 
-	/*
-	 * once the super is inserted into the list by sget, s_umount
-	 * will protect the lockfs code from trying to start a snapshot
-	 * while we are mounting
-	 */
-	mutex_lock(&bdev->bd_fsfreeze_mutex);
-	if (bdev->bd_fsfreeze_count > 0) {
-		mutex_unlock(&bdev->bd_fsfreeze_mutex);
-		error = -EBUSY;
-		goto error_bdev;
-	}
-	s = sget(fs_type, test_gfs2_super, set_gfs2_super, flags, bdev);
-	mutex_unlock(&bdev->bd_fsfreeze_mutex);
-	error = PTR_ERR(s);
-	if (IS_ERR(s))
-		goto error_bdev;
-
-	if (s->s_root) {
-		/*
-		 * s_umount nests inside bd_mutex during
-		 * __invalidate_device().  blkdev_put() acquires
-		 * bd_mutex and can't be called under s_umount.  Drop
-		 * s_umount temporarily.  This is safe as we're
-		 * holding an active reference.
-		 */
-		up_write(&s->s_umount);
-		blkdev_put(bdev, mode);
-		down_write(&s->s_umount);
-	} else {
-		/* s_mode must be set before deactivate_locked_super calls */
-		s->s_mode = mode;
-	}
+static const struct fs_parameter_spec gfs2_param_specs[] = {
+	fsparam_string ("lockproto",          Opt_lockproto),
+	fsparam_string ("locktable",          Opt_locktable),
+	fsparam_string ("hostdata",           Opt_hostdata),
+	fsparam_flag   ("spectator",          Opt_spectator),
+	fsparam_flag   ("norecovery",         Opt_spectator),
+	fsparam_flag   ("ignore_local_fs",    Opt_ignore_local_fs),
+	fsparam_flag   ("localflocks",        Opt_localflocks),
+	fsparam_flag   ("localcaching",       Opt_localcaching),
+	fsparam_flag_no("debug",              Opt_debug),
+	fsparam_flag   ("upgrade",            Opt_upgrade),
+	fsparam_flag_no("acl",                Opt_acl),
+	fsparam_flag_no("suiddir",            Opt_suiddir),
+	fsparam_enum   ("data",               Opt_data),
+	fsparam_flag   ("meta",               Opt_meta),
+	fsparam_flag_no("discard",            Opt_discard),
+	fsparam_s32    ("commit",             Opt_commit),
+	fsparam_enum   ("errors",             Opt_errors),
+	fsparam_s32    ("statfs_quantum",     Opt_statfs_quantum),
+	fsparam_s32    ("statfs_percent",     Opt_statfs_percent),
+	fsparam_s32    ("quota_quantum",      Opt_quota_quantum),
+	fsparam_flag_no("barrier",            Opt_barrier),
+	fsparam_flag_no("rgrplvb",            Opt_rgrplvb),
+	fsparam_flag_no("loccookie",          Opt_loccookie),
+	/* quota can be a flag or an enum so it gets special treatment */
+	__fsparam(fs_param_is_enum, "quota", Opt_quota, fs_param_neg_with_no|fs_param_v_optional),
+	{}
+};
 
-	memset(&args, 0, sizeof(args));
-	args.ar_quota = GFS2_QUOTA_DEFAULT;
-	args.ar_data = GFS2_DATA_DEFAULT;
-	args.ar_commit = 30;
-	args.ar_statfs_quantum = 30;
-	args.ar_quota_quantum = 60;
-	args.ar_errors = GFS2_ERRORS_DEFAULT;
+static const struct fs_parameter_enum gfs2_param_enums[] = {
+	{ Opt_quota,    "off",        Opt_quota_off },
+	{ Opt_quota,    "account",    Opt_quota_account },
+	{ Opt_quota,    "on",         Opt_quota_on },
+	{ Opt_data,     "writeback",  Opt_data_writeback },
+	{ Opt_data,     "ordered",    Opt_data_ordered },
+	{ Opt_errors,   "withdraw",   Opt_errors_withdraw },
+	{ Opt_errors,   "panic",      Opt_errors_panic },
+	{}
+};
 
-	error = gfs2_mount_args(&args, data);
-	if (error) {
-		pr_warn("can't parse mount arguments\n");
-		goto error_super;
+const struct fs_parameter_description gfs2_fs_parameters = {
+	.name = "gfs2",
+	.specs = gfs2_param_specs,
+	.enums = gfs2_param_enums,
+};
+
+/* Parse a single mount parameter */
+static int gfs2_parse_param(struct fs_context *fc, struct fs_parameter *param)
+{
+	struct gfs2_args *args = fc->fs_private;
+	struct fs_parse_result result;
+	int o;
+
+	o = fs_parse(fc, &gfs2_fs_parameters, param, &result);
+	if (o < 0)
+		return o;
+
+	switch (o) {
+	case Opt_lockproto:
+		strlcpy(args->ar_lockproto, param->string, GFS2_LOCKNAME_LEN);
+		break;
+	case Opt_locktable:
+		strlcpy(args->ar_locktable, param->string, GFS2_LOCKNAME_LEN);
+		break;
+	case Opt_hostdata:
+		strlcpy(args->ar_hostdata, param->string, GFS2_LOCKNAME_LEN);
+		break;
+	case Opt_spectator:
+		args->ar_spectator = 1;
+		break;
+	case Opt_ignore_local_fs:
+		/* Retained for backwards compat only */
+		break;
+	case Opt_localflocks:
+		args->ar_localflocks = 1;
+		break;
+	case Opt_localcaching:
+		/* Retained for backwards compat only */
+		break;
+	case Opt_debug:
+		if (result.boolean && args->ar_errors == GFS2_ERRORS_PANIC)
+			return invalf(fc, "gfs2: -o debug and -o errors=panic are mutually exclusive");
+		args->ar_debug = result.boolean;
+		break;
+	case Opt_upgrade:
+		/* Retained for backwards compat only */
+		break;
+	case Opt_acl:
+		args->ar_posix_acl = result.boolean;
+		break;
+	case Opt_quota:
+		/* The quota option can be a flag or an enum. A non-zero int_32
+		   result means that we have an enum index. Otherwise we have
+		   to rely on the 'negated' flag to tell us whether 'quota' or
+		   'noquota' was specified. */
+		if (result.negated)
+			args->ar_quota = GFS2_QUOTA_OFF;
+		else if (result.int_32 > 0)
+			args->ar_quota = opt_quota_values[result.int_32];
+		else
+			args->ar_quota = GFS2_QUOTA_ON;
+		break;
+	case Opt_suiddir:
+		args->ar_suiddir = result.boolean;
+		break;
+	case Opt_data:
+		/* The uint_32 result maps directly to GFS2_DATA_* */
+		args->ar_data = result.uint_32;
+		break;
+	case Opt_meta:
+		args->ar_meta = 1;
+		break;
+	case Opt_discard:
+		args->ar_discard = result.boolean;
+		break;
+	case Opt_commit:
+		if (result.int_32 <= 0)
+			return invalf(fc, "gfs2: commit mount option requires a positive numeric argument");
+		args->ar_commit = result.int_32;
+		break;
+	case Opt_statfs_quantum:
+		if (result.int_32 < 0)
+			return invalf(fc, "gfs2: statfs_quantum mount option requires a non-negative numeric argument");
+		args->ar_statfs_quantum = result.int_32;
+		break;
+	case Opt_quota_quantum:
+		if (result.int_32 <= 0)
+			return invalf(fc, "gfs2: quota_quantum mount option requires a positive numeric argument");
+		args->ar_quota_quantum = result.int_32;
+		break;
+	case Opt_statfs_percent:
+		if (result.int_32 < 0 || result.int_32 > 100)
+			return invalf(fc, "gfs2: statfs_percent mount option requires a numeric argument between 0 and 100");
+		args->ar_statfs_percent = result.int_32;
+		break;
+	case Opt_errors:
+		if (args->ar_debug && result.uint_32 == GFS2_ERRORS_PANIC)
+			return invalf(fc, "gfs2: -o debug and -o errors=panic are mutually exclusive");
+		args->ar_errors = result.uint_32;
+		break;
+	case Opt_barrier:
+		args->ar_nobarrier = result.boolean;
+		break;
+	case Opt_rgrplvb:
+		args->ar_rgrplvb = result.boolean;
+		break;
+	case Opt_loccookie:
+		args->ar_loccookie = result.boolean;
+		break;
+	default:
+		return invalf(fc, "gfs2: invalid mount option: %s", param->key);
 	}
+	return 0;
+}
 
-	if (s->s_root) {
-		error = -EBUSY;
-		if ((flags ^ s->s_flags) & SB_RDONLY)
-			goto error_super;
-	} else {
-		snprintf(s->s_id, sizeof(s->s_id), "%pg", bdev);
-		sb_set_blocksize(s, block_size(bdev));
-		error = fill_super(s, &args, flags & SB_SILENT ? 1 : 0);
-		if (error)
-			goto error_super;
-		s->s_flags |= SB_ACTIVE;
-		bdev->bd_super = s;
+static int gfs2_reconfigure(struct fs_context *fc)
+{
+	struct super_block *sb = fc->root->d_sb;
+	struct gfs2_sbd *sdp = sb->s_fs_info;
+	struct gfs2_args *oldargs = &sdp->sd_args;
+	struct gfs2_args *newargs = fc->fs_private;
+	struct gfs2_tune *gt = &sdp->sd_tune;
+	int error = 0;
+
+	sync_filesystem(sb);
+
+	spin_lock(&gt->gt_spin);
+	oldargs->ar_commit = gt->gt_logd_secs;
+	oldargs->ar_quota_quantum = gt->gt_quota_quantum;
+	if (gt->gt_statfs_slow)
+		oldargs->ar_statfs_quantum = 0;
+	else
+		oldargs->ar_statfs_quantum = gt->gt_statfs_quantum;
+	spin_unlock(&gt->gt_spin);
+
+	if (strcmp(newargs->ar_lockproto, oldargs->ar_lockproto)) {
+		errorf(fc, "gfs2: reconfiguration of locking protocol not allowed");
+		return -EINVAL;
+	}
+	if (strcmp(newargs->ar_locktable, oldargs->ar_locktable)) {
+		errorf(fc, "gfs2: reconfiguration of lock table not allowed");
+		return -EINVAL;
+	}
+	if (strcmp(newargs->ar_hostdata, oldargs->ar_hostdata)) {
+		errorf(fc, "gfs2: reconfiguration of host data not allowed");
+		return -EINVAL;
+	}
+	if (newargs->ar_spectator != oldargs->ar_spectator) {
+		errorf(fc, "gfs2: reconfiguration of spectator mode not allowed");
+		return -EINVAL;
+	}
+	if (newargs->ar_localflocks != oldargs->ar_localflocks) {
+		errorf(fc, "gfs2: reconfiguration of localflocks not allowed");
+		return -EINVAL;
+	}
+	if (newargs->ar_meta != oldargs->ar_meta) {
+		errorf(fc, "gfs2: switching between gfs2 and gfs2meta not allowed");
+		return -EINVAL;
+	}
+	if (oldargs->ar_spectator)
+		fc->sb_flags |= SB_RDONLY;
+
+	if ((sb->s_flags ^ fc->sb_flags) & SB_RDONLY) {
+		if (fc->sb_flags & SB_RDONLY) {
+			error = gfs2_make_fs_ro(sdp);
+			if (error)
+				errorf(fc, "gfs2: unable to remount read-only");
+		} else {
+			error = gfs2_make_fs_rw(sdp);
+			if (error)
+				errorf(fc, "gfs2: unable to remount read-write");
+		}
 	}
+	sdp->sd_args = *newargs;
 
-	sdp = s->s_fs_info;
-	if (args.ar_meta)
-		return dget(sdp->sd_master_dir);
+	if (sdp->sd_args.ar_posix_acl)
+		sb->s_flags |= SB_POSIXACL;
+	else
+		sb->s_flags &= ~SB_POSIXACL;
+	if (sdp->sd_args.ar_nobarrier)
+		set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
 	else
-		return dget(sdp->sd_root_dir);
-
-error_super:
-	deactivate_locked_super(s);
-	return ERR_PTR(error);
-error_bdev:
-	blkdev_put(bdev, mode);
-	return ERR_PTR(error);
+		clear_bit(SDF_NOBARRIERS, &sdp->sd_flags);
+	spin_lock(&gt->gt_spin);
+	gt->gt_logd_secs = newargs->ar_commit;
+	gt->gt_quota_quantum = newargs->ar_quota_quantum;
+	if (newargs->ar_statfs_quantum) {
+		gt->gt_statfs_slow = 0;
+		gt->gt_statfs_quantum = newargs->ar_statfs_quantum;
+	}
+	else {
+		gt->gt_statfs_slow = 1;
+		gt->gt_statfs_quantum = 30;
+	}
+	spin_unlock(&gt->gt_spin);
+
+	gfs2_online_uevent(sdp);
+	return error;
+}
+
+static const struct fs_context_operations gfs2_context_ops = {
+	.free        = gfs2_fc_free,
+	.parse_param = gfs2_parse_param,
+	.get_tree    = gfs2_get_tree,
+	.reconfigure = gfs2_reconfigure,
+};
+
+/* Set up the filesystem mount context */
+static int gfs2_init_fs_context(struct fs_context *fc)
+{
+	struct gfs2_args *args;
+
+	args = kzalloc(sizeof(*args), GFP_KERNEL);
+	if (args == NULL)
+		return -ENOMEM;
+
+	args->ar_quota = GFS2_QUOTA_DEFAULT;
+	args->ar_data = GFS2_DATA_DEFAULT;
+	args->ar_commit = 30;
+	args->ar_statfs_quantum = 30;
+	args->ar_quota_quantum = 60;
+	args->ar_errors = GFS2_ERRORS_DEFAULT;
+
+	fc->fs_private = args;
+	fc->ops = &gfs2_context_ops;
+	return 0;
 }
 
-static int set_meta_super(struct super_block *s, void *ptr)
+static int set_meta_super(struct super_block *s, struct fs_context *fc)
 {
 	return -EINVAL;
 }
 
-static struct dentry *gfs2_mount_meta(struct file_system_type *fs_type,
-			int flags, const char *dev_name, void *data)
+static int test_meta_super(struct super_block *s, struct fs_context *fc)
+{
+	return (fc->sget_key == s->s_bdev);
+}
+
+static int gfs2_meta_get_tree(struct fs_context *fc)
 {
 	struct super_block *s;
 	struct gfs2_sbd *sdp;
 	struct path path;
 	int error;
 
-	if (!dev_name || !*dev_name)
-		return ERR_PTR(-EINVAL);
+	if (!fc->source || !*fc->source)
+		return -EINVAL;
 
-	error = kern_path(dev_name, LOOKUP_FOLLOW, &path);
+	error = kern_path(fc->source, LOOKUP_FOLLOW, &path);
 	if (error) {
 		pr_warn("path_lookup on %s returned error %d\n",
-			dev_name, error);
-		return ERR_PTR(error);
+		        fc->source, error);
+		return error;
 	}
-	s = sget(&gfs2_fs_type, test_gfs2_super, set_meta_super, flags,
-		 path.dentry->d_sb->s_bdev);
+	fc->fs_type = &gfs2_fs_type;
+	fc->sget_key = path.dentry->d_sb->s_bdev;
+	s = sget_fc(fc, test_meta_super, set_meta_super);
 	path_put(&path);
 	if (IS_ERR(s)) {
 		pr_warn("gfs2 mount does not exist\n");
-		return ERR_CAST(s);
+		return PTR_ERR(s);
 	}
-	if ((flags ^ s->s_flags) & SB_RDONLY) {
+	if ((fc->sb_flags ^ s->s_flags) & SB_RDONLY) {
 		deactivate_locked_super(s);
-		return ERR_PTR(-EBUSY);
+		return -EBUSY;
 	}
 	sdp = s->s_fs_info;
-	return dget(sdp->sd_master_dir);
+	fc->root = dget(sdp->sd_master_dir);
+	return 0;
+}
+
+static const struct fs_context_operations gfs2_meta_context_ops = {
+	.get_tree    = gfs2_meta_get_tree,
+};
+
+static int gfs2_meta_init_fs_context(struct fs_context *fc)
+{
+	int ret = gfs2_init_fs_context(fc);
+
+	if (ret)
+		return ret;
+
+	fc->ops = &gfs2_meta_context_ops;
+	return 0;
 }
 
 static void gfs2_kill_sb(struct super_block *sb)
@@ -1383,7 +1635,8 @@ static void gfs2_kill_sb(struct super_block *sb)
 struct file_system_type gfs2_fs_type = {
 	.name = "gfs2",
 	.fs_flags = FS_REQUIRES_DEV,
-	.mount = gfs2_mount,
+	.init_fs_context = gfs2_init_fs_context,
+	.parameters = &gfs2_fs_parameters,
 	.kill_sb = gfs2_kill_sb,
 	.owner = THIS_MODULE,
 };
@@ -1392,7 +1645,7 @@ MODULE_ALIAS_FS("gfs2");
 struct file_system_type gfs2meta_fs_type = {
 	.name = "gfs2meta",
 	.fs_flags = FS_REQUIRES_DEV,
-	.mount = gfs2_mount_meta,
+	.init_fs_context = gfs2_meta_init_fs_context,
 	.owner = THIS_MODULE,
 };
 MODULE_ALIAS_FS("gfs2meta");
diff --git a/fs/gfs2/super.c b/fs/gfs2/super.c
index 644c70ae09f7..5fa1eec4fb4f 100644
--- a/fs/gfs2/super.c
+++ b/fs/gfs2/super.c
@@ -44,258 +44,6 @@
 #include "xattr.h"
 #include "lops.h"
 
-#define args_neq(a1, a2, x) ((a1)->ar_##x != (a2)->ar_##x)
-
-enum {
-	Opt_lockproto,
-	Opt_locktable,
-	Opt_hostdata,
-	Opt_spectator,
-	Opt_ignore_local_fs,
-	Opt_localflocks,
-	Opt_localcaching,
-	Opt_debug,
-	Opt_nodebug,
-	Opt_upgrade,
-	Opt_acl,
-	Opt_noacl,
-	Opt_quota_off,
-	Opt_quota_account,
-	Opt_quota_on,
-	Opt_quota,
-	Opt_noquota,
-	Opt_suiddir,
-	Opt_nosuiddir,
-	Opt_data_writeback,
-	Opt_data_ordered,
-	Opt_meta,
-	Opt_discard,
-	Opt_nodiscard,
-	Opt_commit,
-	Opt_err_withdraw,
-	Opt_err_panic,
-	Opt_statfs_quantum,
-	Opt_statfs_percent,
-	Opt_quota_quantum,
-	Opt_barrier,
-	Opt_nobarrier,
-	Opt_rgrplvb,
-	Opt_norgrplvb,
-	Opt_loccookie,
-	Opt_noloccookie,
-	Opt_error,
-};
-
-static const match_table_t tokens = {
-	{Opt_lockproto, "lockproto=%s"},
-	{Opt_locktable, "locktable=%s"},
-	{Opt_hostdata, "hostdata=%s"},
-	{Opt_spectator, "spectator"},
-	{Opt_spectator, "norecovery"},
-	{Opt_ignore_local_fs, "ignore_local_fs"},
-	{Opt_localflocks, "localflocks"},
-	{Opt_localcaching, "localcaching"},
-	{Opt_debug, "debug"},
-	{Opt_nodebug, "nodebug"},
-	{Opt_upgrade, "upgrade"},
-	{Opt_acl, "acl"},
-	{Opt_noacl, "noacl"},
-	{Opt_quota_off, "quota=off"},
-	{Opt_quota_account, "quota=account"},
-	{Opt_quota_on, "quota=on"},
-	{Opt_quota, "quota"},
-	{Opt_noquota, "noquota"},
-	{Opt_suiddir, "suiddir"},
-	{Opt_nosuiddir, "nosuiddir"},
-	{Opt_data_writeback, "data=writeback"},
-	{Opt_data_ordered, "data=ordered"},
-	{Opt_meta, "meta"},
-	{Opt_discard, "discard"},
-	{Opt_nodiscard, "nodiscard"},
-	{Opt_commit, "commit=%d"},
-	{Opt_err_withdraw, "errors=withdraw"},
-	{Opt_err_panic, "errors=panic"},
-	{Opt_statfs_quantum, "statfs_quantum=%d"},
-	{Opt_statfs_percent, "statfs_percent=%d"},
-	{Opt_quota_quantum, "quota_quantum=%d"},
-	{Opt_barrier, "barrier"},
-	{Opt_nobarrier, "nobarrier"},
-	{Opt_rgrplvb, "rgrplvb"},
-	{Opt_norgrplvb, "norgrplvb"},
-	{Opt_loccookie, "loccookie"},
-	{Opt_noloccookie, "noloccookie"},
-	{Opt_error, NULL}
-};
-
-/**
- * gfs2_mount_args - Parse mount options
- * @args: The structure into which the parsed options will be written
- * @options: The options to parse
- *
- * Return: errno
- */
-
-int gfs2_mount_args(struct gfs2_args *args, char *options)
-{
-	char *o;
-	int token;
-	substring_t tmp[MAX_OPT_ARGS];
-	int rv;
-
-	/* Split the options into tokens with the "," character and
-	   process them */
-
-	while (1) {
-		o = strsep(&options, ",");
-		if (o == NULL)
-			break;
-		if (*o == '\0')
-			continue;
-
-		token = match_token(o, tokens, tmp);
-		switch (token) {
-		case Opt_lockproto:
-			match_strlcpy(args->ar_lockproto, &tmp[0],
-				      GFS2_LOCKNAME_LEN);
-			break;
-		case Opt_locktable:
-			match_strlcpy(args->ar_locktable, &tmp[0],
-				      GFS2_LOCKNAME_LEN);
-			break;
-		case Opt_hostdata:
-			match_strlcpy(args->ar_hostdata, &tmp[0],
-				      GFS2_LOCKNAME_LEN);
-			break;
-		case Opt_spectator:
-			args->ar_spectator = 1;
-			break;
-		case Opt_ignore_local_fs:
-			/* Retained for backwards compat only */
-			break;
-		case Opt_localflocks:
-			args->ar_localflocks = 1;
-			break;
-		case Opt_localcaching:
-			/* Retained for backwards compat only */
-			break;
-		case Opt_debug:
-			if (args->ar_errors == GFS2_ERRORS_PANIC) {
-				pr_warn("-o debug and -o errors=panic are mutually exclusive\n");
-				return -EINVAL;
-			}
-			args->ar_debug = 1;
-			break;
-		case Opt_nodebug:
-			args->ar_debug = 0;
-			break;
-		case Opt_upgrade:
-			/* Retained for backwards compat only */
-			break;
-		case Opt_acl:
-			args->ar_posix_acl = 1;
-			break;
-		case Opt_noacl:
-			args->ar_posix_acl = 0;
-			break;
-		case Opt_quota_off:
-		case Opt_noquota:
-			args->ar_quota = GFS2_QUOTA_OFF;
-			break;
-		case Opt_quota_account:
-			args->ar_quota = GFS2_QUOTA_ACCOUNT;
-			break;
-		case Opt_quota_on:
-		case Opt_quota:
-			args->ar_quota = GFS2_QUOTA_ON;
-			break;
-		case Opt_suiddir:
-			args->ar_suiddir = 1;
-			break;
-		case Opt_nosuiddir:
-			args->ar_suiddir = 0;
-			break;
-		case Opt_data_writeback:
-			args->ar_data = GFS2_DATA_WRITEBACK;
-			break;
-		case Opt_data_ordered:
-			args->ar_data = GFS2_DATA_ORDERED;
-			break;
-		case Opt_meta:
-			args->ar_meta = 1;
-			break;
-		case Opt_discard:
-			args->ar_discard = 1;
-			break;
-		case Opt_nodiscard:
-			args->ar_discard = 0;
-			break;
-		case Opt_commit:
-			rv = match_int(&tmp[0], &args->ar_commit);
-			if (rv || args->ar_commit <= 0) {
-				pr_warn("commit mount option requires a positive numeric argument\n");
-				return rv ? rv : -EINVAL;
-			}
-			break;
-		case Opt_statfs_quantum:
-			rv = match_int(&tmp[0], &args->ar_statfs_quantum);
-			if (rv || args->ar_statfs_quantum < 0) {
-				pr_warn("statfs_quantum mount option requires a non-negative numeric argument\n");
-				return rv ? rv : -EINVAL;
-			}
-			break;
-		case Opt_quota_quantum:
-			rv = match_int(&tmp[0], &args->ar_quota_quantum);
-			if (rv || args->ar_quota_quantum <= 0) {
-				pr_warn("quota_quantum mount option requires a positive numeric argument\n");
-				return rv ? rv : -EINVAL;
-			}
-			break;
-		case Opt_statfs_percent:
-			rv = match_int(&tmp[0], &args->ar_statfs_percent);
-			if (rv || args->ar_statfs_percent < 0 ||
-			    args->ar_statfs_percent > 100) {
-				pr_warn("statfs_percent mount option requires a numeric argument between 0 and 100\n");
-				return rv ? rv : -EINVAL;
-			}
-			break;
-		case Opt_err_withdraw:
-			args->ar_errors = GFS2_ERRORS_WITHDRAW;
-			break;
-		case Opt_err_panic:
-			if (args->ar_debug) {
-				pr_warn("-o debug and -o errors=panic are mutually exclusive\n");
-				return -EINVAL;
-			}
-			args->ar_errors = GFS2_ERRORS_PANIC;
-			break;
-		case Opt_barrier:
-			args->ar_nobarrier = 0;
-			break;
-		case Opt_nobarrier:
-			args->ar_nobarrier = 1;
-			break;
-		case Opt_rgrplvb:
-			args->ar_rgrplvb = 1;
-			break;
-		case Opt_norgrplvb:
-			args->ar_rgrplvb = 0;
-			break;
-		case Opt_loccookie:
-			args->ar_loccookie = 1;
-			break;
-		case Opt_noloccookie:
-			args->ar_loccookie = 0;
-			break;
-		case Opt_error:
-		default:
-			pr_warn("invalid mount option: %s\n", o);
-			return -EINVAL;
-		}
-	}
-
-	return 0;
-}
-
 /**
  * gfs2_jindex_free - Clear all the journal index information
  * @sdp: The GFS2 superblock
@@ -847,7 +595,7 @@ out:
  * Returns: errno
  */
 
-static int gfs2_make_fs_ro(struct gfs2_sbd *sdp)
+int gfs2_make_fs_ro(struct gfs2_sbd *sdp)
 {
 	struct gfs2_holder freeze_gh;
 	int error;
@@ -1227,84 +975,6 @@ static int gfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
 }
 
 /**
- * gfs2_remount_fs - called when the FS is remounted
- * @sb:  the filesystem
- * @flags:  the remount flags
- * @data:  extra data passed in (not used right now)
- *
- * Returns: errno
- */
-
-static int gfs2_remount_fs(struct super_block *sb, int *flags, char *data)
-{
-	struct gfs2_sbd *sdp = sb->s_fs_info;
-	struct gfs2_args args = sdp->sd_args; /* Default to current settings */
-	struct gfs2_tune *gt = &sdp->sd_tune;
-	int error;
-
-	sync_filesystem(sb);
-
-	spin_lock(&gt->gt_spin);
-	args.ar_commit = gt->gt_logd_secs;
-	args.ar_quota_quantum = gt->gt_quota_quantum;
-	if (gt->gt_statfs_slow)
-		args.ar_statfs_quantum = 0;
-	else
-		args.ar_statfs_quantum = gt->gt_statfs_quantum;
-	spin_unlock(&gt->gt_spin);
-	error = gfs2_mount_args(&args, data);
-	if (error)
-		return error;
-
-	/* Not allowed to change locking details */
-	if (strcmp(args.ar_lockproto, sdp->sd_args.ar_lockproto) ||
-	    strcmp(args.ar_locktable, sdp->sd_args.ar_locktable) ||
-	    strcmp(args.ar_hostdata, sdp->sd_args.ar_hostdata))
-		return -EINVAL;
-
-	/* Some flags must not be changed */
-	if (args_neq(&args, &sdp->sd_args, spectator) ||
-	    args_neq(&args, &sdp->sd_args, localflocks) ||
-	    args_neq(&args, &sdp->sd_args, meta))
-		return -EINVAL;
-
-	if (sdp->sd_args.ar_spectator)
-		*flags |= SB_RDONLY;
-
-	if ((sb->s_flags ^ *flags) & SB_RDONLY) {
-		if (*flags & SB_RDONLY)
-			error = gfs2_make_fs_ro(sdp);
-		else
-			error = gfs2_make_fs_rw(sdp);
-	}
-
-	sdp->sd_args = args;
-	if (sdp->sd_args.ar_posix_acl)
-		sb->s_flags |= SB_POSIXACL;
-	else
-		sb->s_flags &= ~SB_POSIXACL;
-	if (sdp->sd_args.ar_nobarrier)
-		set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
-	else
-		clear_bit(SDF_NOBARRIERS, &sdp->sd_flags);
-	spin_lock(&gt->gt_spin);
-	gt->gt_logd_secs = args.ar_commit;
-	gt->gt_quota_quantum = args.ar_quota_quantum;
-	if (args.ar_statfs_quantum) {
-		gt->gt_statfs_slow = 0;
-		gt->gt_statfs_quantum = args.ar_statfs_quantum;
-	}
-	else {
-		gt->gt_statfs_slow = 1;
-		gt->gt_statfs_quantum = 30;
-	}
-	spin_unlock(&gt->gt_spin);
-
-	gfs2_online_uevent(sdp);
-	return error;
-}
-
-/**
  * gfs2_drop_inode - Drop an inode (test for remote unlink)
  * @inode: The inode to drop
  *
@@ -1748,7 +1418,6 @@ const struct super_operations gfs2_super_ops = {
 	.freeze_super		= gfs2_freeze,
 	.thaw_super		= gfs2_unfreeze,
 	.statfs			= gfs2_statfs,
-	.remount_fs		= gfs2_remount_fs,
 	.drop_inode		= gfs2_drop_inode,
 	.show_options		= gfs2_show_options,
 };
diff --git a/fs/gfs2/super.h b/fs/gfs2/super.h
index 9d49eaadb9d9..b8bf811a1305 100644
--- a/fs/gfs2/super.h
+++ b/fs/gfs2/super.h
@@ -24,8 +24,6 @@ static inline unsigned int gfs2_jindex_size(struct gfs2_sbd *sdp)
 
 extern void gfs2_jindex_free(struct gfs2_sbd *sdp);
 
-extern int gfs2_mount_args(struct gfs2_args *args, char *data);
-
 extern struct gfs2_jdesc *gfs2_jdesc_find(struct gfs2_sbd *sdp, unsigned int jid);
 extern int gfs2_jdesc_check(struct gfs2_jdesc *jd);
 
@@ -33,6 +31,7 @@ extern int gfs2_lookup_in_master_dir(struct gfs2_sbd *sdp, char *filename,
 				     struct gfs2_inode **ipp);
 
 extern int gfs2_make_fs_rw(struct gfs2_sbd *sdp);
+extern int gfs2_make_fs_ro(struct gfs2_sbd *sdp);
 extern void gfs2_online_uevent(struct gfs2_sbd *sdp);
 extern int gfs2_statfs_init(struct gfs2_sbd *sdp);
 extern void gfs2_statfs_change(struct gfs2_sbd *sdp, s64 total, s64 free,
diff --git a/kernel/bpf/inode.c b/kernel/bpf/inode.c
index cc0d0cf114e3..a70f7209cda3 100644
--- a/kernel/bpf/inode.c
+++ b/kernel/bpf/inode.c
@@ -14,8 +14,9 @@
 #include <linux/mount.h>
 #include <linux/namei.h>
 #include <linux/fs.h>
+#include <linux/fs_context.h>
+#include <linux/fs_parser.h>
 #include <linux/kdev_t.h>
-#include <linux/parser.h>
 #include <linux/filter.h>
 #include <linux/bpf.h>
 #include <linux/bpf_trace.h>
@@ -583,58 +584,52 @@ static const struct super_operations bpf_super_ops = {
 
 enum {
 	OPT_MODE,
-	OPT_ERR,
 };
 
-static const match_table_t bpf_mount_tokens = {
-	{ OPT_MODE, "mode=%o" },
-	{ OPT_ERR, NULL },
+static const struct fs_parameter_spec bpf_param_specs[] = {
+	fsparam_u32oct	("mode",			OPT_MODE),
+	{}
+};
+
+static const struct fs_parameter_description bpf_fs_parameters = {
+	.name		= "bpf",
+	.specs		= bpf_param_specs,
 };
 
 struct bpf_mount_opts {
 	umode_t mode;
 };
 
-static int bpf_parse_options(char *data, struct bpf_mount_opts *opts)
+static int bpf_parse_param(struct fs_context *fc, struct fs_parameter *param)
 {
-	substring_t args[MAX_OPT_ARGS];
-	int option, token;
-	char *ptr;
+	struct bpf_mount_opts *opts = fc->fs_private;
+	struct fs_parse_result result;
+	int opt;
 
-	opts->mode = S_IRWXUGO;
-
-	while ((ptr = strsep(&data, ",")) != NULL) {
-		if (!*ptr)
-			continue;
-
-		token = match_token(ptr, bpf_mount_tokens, args);
-		switch (token) {
-		case OPT_MODE:
-			if (match_octal(&args[0], &option))
-				return -EINVAL;
-			opts->mode = option & S_IALLUGO;
-			break;
+	opt = fs_parse(fc, &bpf_fs_parameters, param, &result);
+	if (opt < 0)
 		/* We might like to report bad mount options here, but
 		 * traditionally we've ignored all mount options, so we'd
 		 * better continue to ignore non-existing options for bpf.
 		 */
-		}
+		return opt == -ENOPARAM ? 0 : opt;
+
+	switch (opt) {
+	case OPT_MODE:
+		opts->mode = result.uint_32 & S_IALLUGO;
+		break;
 	}
 
 	return 0;
 }
 
-static int bpf_fill_super(struct super_block *sb, void *data, int silent)
+static int bpf_fill_super(struct super_block *sb, struct fs_context *fc)
 {
 	static const struct tree_descr bpf_rfiles[] = { { "" } };
-	struct bpf_mount_opts opts;
+	struct bpf_mount_opts *opts = fc->fs_private;
 	struct inode *inode;
 	int ret;
 
-	ret = bpf_parse_options(data, &opts);
-	if (ret)
-		return ret;
-
 	ret = simple_fill_super(sb, BPF_FS_MAGIC, bpf_rfiles);
 	if (ret)
 		return ret;
@@ -644,21 +639,50 @@ static int bpf_fill_super(struct super_block *sb, void *data, int silent)
 	inode = sb->s_root->d_inode;
 	inode->i_op = &bpf_dir_iops;
 	inode->i_mode &= ~S_IALLUGO;
-	inode->i_mode |= S_ISVTX | opts.mode;
+	inode->i_mode |= S_ISVTX | opts->mode;
 
 	return 0;
 }
 
-static struct dentry *bpf_mount(struct file_system_type *type, int flags,
-				const char *dev_name, void *data)
+static int bpf_get_tree(struct fs_context *fc)
+{
+	return get_tree_nodev(fc, bpf_fill_super);
+}
+
+static void bpf_free_fc(struct fs_context *fc)
 {
-	return mount_nodev(type, flags, data, bpf_fill_super);
+	kfree(fc->fs_private);
+}
+
+static const struct fs_context_operations bpf_context_ops = {
+	.free		= bpf_free_fc,
+	.parse_param	= bpf_parse_param,
+	.get_tree	= bpf_get_tree,
+};
+
+/*
+ * Set up the filesystem mount context.
+ */
+static int bpf_init_fs_context(struct fs_context *fc)
+{
+	struct bpf_mount_opts *opts;
+
+	opts = kzalloc(sizeof(struct bpf_mount_opts), GFP_KERNEL);
+	if (!opts)
+		return -ENOMEM;
+
+	opts->mode = S_IRWXUGO;
+
+	fc->fs_private = opts;
+	fc->ops = &bpf_context_ops;
+	return 0;
 }
 
 static struct file_system_type bpf_fs_type = {
 	.owner		= THIS_MODULE,
 	.name		= "bpf",
-	.mount		= bpf_mount,
+	.init_fs_context = bpf_init_fs_context,
+	.parameters	= &bpf_fs_parameters,
 	.kill_sb	= kill_litter_super,
 };