linux-kernel - [RFC PATCH 13/68] vfs: Convert dax to use the new mount API

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Date:   Wed, 27 Mar 2019 23:42:10 +0000
From:   David Howells <dhowells@...hat.com>
To:     viro@...iv.linux.org.uk
Cc:     Dan Williams <dan.j.williams@...el.com>,
        Vishal Verma <vishal.l.verma@...el.com>,
        Keith Busch <keith.busch@...el.com>,
        Dave Jiang <dave.jiang@...el.com>, linux-nvdimm@...ts.01.org,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        dhowells@...hat.com
Subject: [RFC PATCH 13/68] vfs: Convert dax to use the new mount API

Convert the dax 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: Dan Williams <dan.j.williams@...el.com>
cc: Vishal Verma <vishal.l.verma@...el.com>
cc: Keith Busch <keith.busch@...el.com>
cc: Dave Jiang <dave.jiang@...el.com>
cc: linux-nvdimm@...ts.01.org
---

 drivers/dax/super.c |   13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/drivers/dax/super.c b/drivers/dax/super.c
index 0a339b85133e..d8e503678a11 100644
--- a/drivers/dax/super.c
+++ b/drivers/dax/super.c
@@ -13,6 +13,7 @@
 #include <linux/pagemap.h>
 #include <linux/module.h>
 #include <linux/mount.h>
+#include <linux/fs_context.h>
 #include <linux/magic.h>
 #include <linux/genhd.h>
 #include <linux/pfn_t.h>
@@ -440,16 +441,16 @@ static const struct super_operations dax_sops = {
 	.drop_inode = generic_delete_inode,
 };
 
-static struct dentry *dax_mount(struct file_system_type *fs_type,
-		int flags, const char *dev_name, void *data)
+static int dax_init_fs_context(struct fs_context *fc)
 {
-	return mount_pseudo(fs_type, "dax:", &dax_sops, NULL, DAXFS_MAGIC);
+	return vfs_init_pseudo_fs_context(fc, "dax:",
+					  &dax_sops, NULL, NULL, DAXFS_MAGIC);
 }
 
 static struct file_system_type dax_fs_type = {
-	.name = "dax",
-	.mount = dax_mount,
-	.kill_sb = kill_anon_super,
+	.name		= "dax",
+	.init_fs_context = dax_init_fs_context,
+	.kill_sb	= kill_anon_super,
 };
 
 static int dax_test(struct inode *inode, void *data)