linux-kernel - [RFC PATCH 32/68] vfs: Convert ibmasmfs to use the new mount API

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Message-ID: <155373027484.7602.9446083590236560498.stgit@warthog.procyon.org.uk>
Date:   Wed, 27 Mar 2019 23:44:34 +0000
From:   David Howells <dhowells@...hat.com>
To:     viro@...iv.linux.org.uk
Cc:     Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        dhowells@...hat.com
Subject: [RFC PATCH 32/68] vfs: Convert ibmasmfs to use the new mount API

Convert the ibmasmfs filesystem to the new internal mount API as the old
one will be obsoleted and removed.  This allows greater flexibility in
communication of mount parameters between userspace, the VFS and the
filesystem.

See Documentation/filesystems/mount_api.txt for more information.

Signed-off-by: David Howells <dhowells@...hat.com>
cc: Arnd Bergmann <arnd@...db.de>
cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---

 drivers/misc/ibmasm/ibmasmfs.c |   21 +++++++++++++++------
 1 file changed, 15 insertions(+), 6 deletions(-)

diff --git a/drivers/misc/ibmasm/ibmasmfs.c b/drivers/misc/ibmasm/ibmasmfs.c
index fa840666bdd1..e615f335db99 100644
--- a/drivers/misc/ibmasm/ibmasmfs.c
+++ b/drivers/misc/ibmasm/ibmasmfs.c
@@ -74,6 +74,7 @@
  */
 
 #include <linux/fs.h>
+#include <linux/fs_context.h>
 #include <linux/pagemap.h>
 #include <linux/slab.h>
 #include <linux/uaccess.h>
@@ -88,13 +89,21 @@ static LIST_HEAD(service_processors);
 
 static struct inode *ibmasmfs_make_inode(struct super_block *sb, int mode);
 static void ibmasmfs_create_files (struct super_block *sb);
-static int ibmasmfs_fill_super (struct super_block *sb, void *data, int silent);
+static int ibmasmfs_fill_super(struct super_block *sb, struct fs_context *fc);
 
+static int ibmasmfs_get_tree(struct fs_context *fc)
+{
+	return vfs_get_super(fc, vfs_get_single_super, ibmasmfs_fill_super);
+}
 
-static struct dentry *ibmasmfs_mount(struct file_system_type *fst,
-			int flags, const char *name, void *data)
+static const struct fs_context_operations ibmasmfs_context_ops = {
+	.get_tree	= ibmasmfs_get_tree,
+};
+
+static int ibmasmfs_init_fs_context(struct fs_context *fc)
 {
-	return mount_single(fst, flags, data, ibmasmfs_fill_super);
+	fc->ops = &ibmasmfs_context_ops;
+	return 0;
 }
 
 static const struct super_operations ibmasmfs_s_ops = {
@@ -107,12 +116,12 @@ static const struct file_operations *ibmasmfs_dir_ops = &simple_dir_operations;
 static struct file_system_type ibmasmfs_type = {
 	.owner          = THIS_MODULE,
 	.name           = "ibmasmfs",
-	.mount          = ibmasmfs_mount,
+	.init_fs_context = ibmasmfs_init_fs_context,
 	.kill_sb        = kill_litter_super,
 };
 MODULE_ALIAS_FS("ibmasmfs");
 
-static int ibmasmfs_fill_super (struct super_block *sb, void *data, int silent)
+static int ibmasmfs_fill_super(struct super_block *sb, struct fs_context *fc)
 {
 	struct inode *root;