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Date: Tue, 16 Jul 2013 16:45:27 -0700 (PDT)
From: Rob Landley <rob@...dley.net>
To: linux-kernel@...r.kernel.org
Cc: linux-fsdevel@...r.kernel.org, Jeff Layton <jlayton@...hat.com>,
Jens Axboe <axboe@...nel.dk>,
Stephen Warren <swarren@...dia.com>,
Rusty Russell <rusty@...tcorp.com.au>,
Jim Cromie <jim.cromie@...il.com>,
Sam Ravnborg <sam@...nborg.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Andrew Morton <akpm@...ux-foundation.org>,
"Eric W. Biederman" <ebiederm@...ssion.com>,
Alexander Viro <viro@...iv.linux.org.uk>
Subject: [PATCH 3/5] initmpfs v2: Move rootfs code from fs/ramfs/ to init/
From: Rob Landley <rob@...dley.net>
When the rootfs code was a wrapper around ramfs, having them in the same
file made sense. Now that it can wrap another filesystem type, move it
in with the init code instead.
This also allows a subsequent patch to access rootfstype= command line arg.
Signed-off-by: Rob Landley <rob@...dley.net>
---
fs/namespace.c | 2 +-
fs/ramfs/inode.c | 32 +-------------------------------
include/linux/init.h | 1 +
include/linux/ramfs.h | 2 +-
init/do_mounts.c | 32 ++++++++++++++++++++++++++++++++
5 files changed, 36 insertions(+), 33 deletions(-)
--- initold/fs/namespace.c 2013-06-28 15:09:19.389872904 -0500
+++ initold2/fs/namespace.c 2013-06-28 15:16:05.261889820 -0500
@@ -17,7 +17,7 @@
#include <linux/security.h>
#include <linux/idr.h>
#include <linux/acct.h> /* acct_auto_close_mnt */
-#include <linux/ramfs.h> /* init_rootfs */
+#include <linux/init.h> /* init_rootfs */
#include <linux/fs_struct.h> /* get_fs_root et.al. */
#include <linux/fsnotify.h> /* fsnotify_vfsmount_delete */
#include <linux/uaccess.h>
--- initold/fs/ramfs/inode.c 2013-06-28 15:15:37.549888666 -0500
+++ initold2/fs/ramfs/inode.c 2013-06-28 15:16:05.273889820 -0500
@@ -244,17 +244,6 @@
return mount_nodev(fs_type, flags, data, ramfs_fill_super);
}
-static struct dentry *rootfs_mount(struct file_system_type *fs_type,
- int flags, const char *dev_name, void *data)
-{
- static unsigned long once;
-
- if (test_and_set_bit(1, &once))
- return ERR_PTR(-ENODEV);
-
- return mount_nodev(fs_type, flags, data, ramfs_fill_super);
-}
-
static void ramfs_kill_sb(struct super_block *sb)
{
kfree(sb->s_fs_info);
@@ -267,13 +256,8 @@
.kill_sb = ramfs_kill_sb,
.fs_flags = FS_USERNS_MOUNT,
};
-static struct file_system_type rootfs_fs_type = {
- .name = "rootfs",
- .mount = rootfs_mount,
- .kill_sb = kill_litter_super,
-};
-static int __init init_ramfs_fs(void)
+int __init init_ramfs_fs(void)
{
static unsigned long once;
int err;
@@ -292,17 +276,3 @@
return err;
}
module_init(init_ramfs_fs)
-
-int __init init_rootfs(void)
-{
- int err = register_filesystem(&rootfs_fs_type);
-
- if (err)
- return err;
-
- err = init_ramfs_fs();
- if (err)
- unregister_filesystem(&rootfs_fs_type);
-
- return err;
-}
--- initold/include/linux/init.h 2013-06-28 15:09:19.517872909 -0500
+++ initold2/include/linux/init.h 2013-06-28 15:16:05.321889821 -0500
@@ -153,6 +153,7 @@
void setup_arch(char **);
void prepare_namespace(void);
void __init load_default_modules(void);
+int __init init_rootfs(void);
extern void (*late_time_init)(void);
--- initold/include/linux/ramfs.h 2013-06-28 15:09:19.537872910 -0500
+++ initold2/include/linux/ramfs.h 2013-06-28 15:16:05.513889832 -0500
@@ -25,7 +25,7 @@
extern const struct file_operations ramfs_file_operations;
extern const struct vm_operations_struct generic_file_vm_ops;
-extern int __init init_rootfs(void);
+extern int __init init_ramfs_fs(void);
int ramfs_fill_super(struct super_block *sb, void *data, int silent);
--- initold/init/do_mounts.c 2013-06-28 15:09:19.585872913 -0500
+++ initold2/init/do_mounts.c 2013-06-28 15:16:05.561889831 -0500
@@ -26,6 +26,7 @@
#include <linux/async.h>
#include <linux/fs_struct.h>
#include <linux/slab.h>
+#include <linux/ramfs.h>
#include <linux/nfs_fs.h>
#include <linux/nfs_fs_sb.h>
@@ -588,3 +589,34 @@
sys_mount(".", "/", NULL, MS_MOVE, NULL);
sys_chroot(".");
}
+
+static struct dentry *rootfs_mount(struct file_system_type *fs_type,
+ int flags, const char *dev_name, void *data)
+{
+ static unsigned long once;
+
+ if (test_and_set_bit(1, &once))
+ return ERR_PTR(-ENODEV);
+
+ return mount_nodev(fs_type, flags, data, ramfs_fill_super);
+}
+
+static struct file_system_type rootfs_fs_type = {
+ .name = "rootfs",
+ .mount = rootfs_mount,
+ .kill_sb = kill_litter_super,
+};
+
+int __init init_rootfs(void)
+{
+ int err = register_filesystem(&rootfs_fs_type);
+
+ if (err)
+ return err;
+
+ err = init_ramfs_fs();
+ if (err)
+ unregister_filesystem(&rootfs_fs_type);
+
+ return err;
+}
diff --git a/fs/ramfs/inode.c b/fs/ramfs/inode.c
index c24f1e1..3b9f114 100644
--
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