linux-kernel - [RFC PATCH 11/68] vfs: Convert zsmalloc to use the new mount API

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Message-ID: <155373011498.7602.17060911792199285815.stgit@warthog.procyon.org.uk>
Date:   Wed, 27 Mar 2019 23:41:55 +0000
From:   David Howells <dhowells@...hat.com>
To:     viro@...iv.linux.org.uk
Cc:     Minchan Kim <minchan@...nel.org>, Nitin Gupta <ngupta@...are.org>,
        Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
        linux-mm@...ck.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, dhowells@...hat.com
Subject: [RFC PATCH 11/68] vfs: Convert zsmalloc to use the new mount API

Convert the zsmalloc 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: Minchan Kim <minchan@...nel.org>
cc: Nitin Gupta <ngupta@...are.org>
cc: Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
cc: linux-mm@...ck.org
---

 mm/zsmalloc.c |   19 +++++++++++--------
 1 file changed, 11 insertions(+), 8 deletions(-)

diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c
index 0787d33b80d8..02bfc7f70fab 100644
--- a/mm/zsmalloc.c
+++ b/mm/zsmalloc.c
@@ -52,6 +52,7 @@
 #include <linux/zsmalloc.h>
 #include <linux/zpool.h>
 #include <linux/mount.h>
+#include <linux/fs_context.h>
 #include <linux/migrate.h>
 #include <linux/pagemap.h>
 #include <linux/fs.h>
@@ -1814,19 +1815,21 @@ static void lock_zspage(struct zspage *zspage)
 	} while ((page = get_next_page(page)) != NULL);
 }
 
-static struct dentry *zs_mount(struct file_system_type *fs_type,
-				int flags, const char *dev_name, void *data)
-{
-	static const struct dentry_operations ops = {
-		.d_dname = simple_dname,
-	};
+static const struct dentry_operations zs_dentry_operations = {
+	.d_dname = simple_dname,
+};
 
-	return mount_pseudo(fs_type, "zsmalloc:", NULL, &ops, ZSMALLOC_MAGIC);
+
+static int zs_init_fs_context(struct fs_context *fc)
+{
+	return vfs_init_pseudo_fs_context(fc, "zsmalloc:",
+					  NULL, NULL,
+					  &zs_dentry_operations, ZSMALLOC_MAGIC);
 }
 
 static struct file_system_type zsmalloc_fs = {
 	.name		= "zsmalloc",
-	.mount		= zs_mount,
+	.init_fs_context = zs_init_fs_context,
 	.kill_sb	= kill_anon_super,
 };