[PATCH 08/24] init: pass root_device_name explicitly

Christoph Hellwig
2023-05-23T07:46:47Z

Instead of declaring root_device_name as a global variable pass it as an
argument to the funtions using it.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
init/do_mounts.c | 29 ++++++++++++++++-------------
init/do_mounts.h | 14 +++++++-------
init/do_mounts_initrd.c | 11 ++++++-----
3 files changed, 29 insertions(+), 25 deletions(-)

diff --git a/init/do_mounts.c b/init/do_mounts.c
index e708b02d9d6566..1405ee7218bf00 100644
--- a/init/do_mounts.c
+++ b/init/do_mounts.c
@@ -28,7 +28,6 @@
#include "do_mounts.h"

int root_mountflags = MS_RDONLY | MS_SILENT;
-static char * __initdata root_device_name;
static char __initdata saved_root_name[64];
static int root_wait;

@@ -391,7 +390,7 @@ static int __init do_mount_root(const char *name, const char *fs,
return ret;
}

-void __init mount_root_generic(char *name, int flags)
+void __init mount_root_generic(char *name, char *pretty_name, int flags)
{
struct page *page = alloc_page(GFP_KERNEL);
char *fs_names = page_address(page);
@@ -425,7 +424,7 @@ void __init mount_root_generic(char *name, int flags)
* and give them a list of the available devices
*/
printk("VFS: Cannot open root device \"%s\" or %s: error %d\n",
- root_device_name, b, err);
+ pretty_name, b, err);
printk("Please append a correct \"root=\" boot option; here are the available partitions:\n");

printk_all_partitions();
@@ -541,7 +540,7 @@ static bool __init fs_is_nodev(char *fstype)
return ret;
}

-static int __init mount_nodev_root(void)
+static int __init mount_nodev_root(char *root_device_name)
{
char *fs_names, *fstype;
int err = -EINVAL;
@@ -569,21 +568,21 @@ static int __init mount_nodev_root(void)
}

#ifdef CONFIG_BLOCK
-static void __init mount_block_root(void)
+static void __init mount_block_root(char *root_device_name)
{
int err = create_dev("/dev/root", ROOT_DEV);

if (err < 0)
pr_emerg("Failed to create /dev/root: %d\n", err);
- mount_root_generic("/dev/root", root_mountflags);
+ mount_root_generic("/dev/root", root_device_name, root_mountflags);
}
#else
-static inline void mount_block_root(void)
+static inline void mount_block_root(char *root_device_name)
{
}
#endif /* CONFIG_BLOCK */

-void __init mount_root(void)
+void __init mount_root(char *root_device_name)
{
switch (ROOT_DEV) {
case Root_NFS:
@@ -593,11 +592,12 @@ void __init mount_root(void)
mount_cifs_root();
break;
case 0:
- if (root_device_name && root_fs_names && mount_nodev_root() == 0)
+ if (root_device_name && root_fs_names &&
+ mount_nodev_root(root_device_name) == 0)
break;
fallthrough;
default:
- mount_block_root();
+ mount_block_root(root_device_name);
break;
}
}
@@ -607,6 +607,8 @@ void __init mount_root(void)
*/
void __init prepare_namespace(void)
{
+ char *root_device_name;
+
if (root_delay) {
printk(KERN_INFO "Waiting %d sec before mounting root device...\n",
root_delay);
@@ -628,7 +630,8 @@ void __init prepare_namespace(void)
root_device_name = saved_root_name;
if (!strncmp(root_device_name, "mtd", 3) ||
!strncmp(root_device_name, "ubi", 3)) {
- mount_root_generic(root_device_name, root_mountflags);
+ mount_root_generic(root_device_name, root_device_name,
+ root_mountflags);
goto out;
}
ROOT_DEV = name_to_dev_t(root_device_name);
@@ -636,7 +639,7 @@ void __init prepare_namespace(void)
root_device_name += 5;
}

- if (initrd_load())
+ if (initrd_load(root_device_name))
goto out;

/* wait for any asynchronous scanning to complete */
@@ -649,7 +652,7 @@ void __init prepare_namespace(void)
async_synchronize_full();
}

- mount_root();
+ mount_root(root_device_name);
out:
devtmpfs_mount();
init_mount(".", "/", NULL, MS_MOVE, NULL);
diff --git a/init/do_mounts.h b/init/do_mounts.h
index 33623025f6951a..15e372b00ce704 100644
--- a/init/do_mounts.h
+++ b/init/do_mounts.h
@@ -10,8 +10,8 @@
#include <linux/root_dev.h>
#include <linux/init_syscalls.h>

-void mount_root_generic(char *name, int flags);
-void mount_root(void);
+void mount_root_generic(char *name, char *pretty_name, int flags);
+void mount_root(char *root_device_name);
extern int root_mountflags;

static inline __init int create_dev(char *name, dev_t dev)
@@ -33,11 +33,11 @@ static inline int rd_load_image(char *from) { return 0; }
#endif

#ifdef CONFIG_BLK_DEV_INITRD
-
-bool __init initrd_load(void);
-
+bool __init initrd_load(char *root_device_name);
#else
-
-static inline bool initrd_load(void) { return false; }
+static inline bool initrd_load(char *root_device_name)
+{
+ return false;
+ }

#endif
diff --git a/init/do_mounts_initrd.c b/init/do_mounts_initrd.c
index 686d1ff3af4bb1..425f4bcf4b77e0 100644
--- a/init/do_mounts_initrd.c
+++ b/init/do_mounts_initrd.c
@@ -83,7 +83,7 @@ static int __init init_linuxrc(struct subprocess_info *info, struct cred *new)
return 0;
}

-static void __init handle_initrd(void)
+static void __init handle_initrd(char *root_device_name)
{
struct subprocess_info *info;
static char *argv[] = { "linuxrc", NULL, };
@@ -95,7 +95,8 @@ static void __init handle_initrd(void)
real_root_dev = new_encode_dev(ROOT_DEV);
create_dev("/dev/root.old", Root_RAM0);
/* mount initrd on rootfs' /root */
- mount_root_generic("/dev/root.old", root_mountflags & ~MS_RDONLY);
+ mount_root_generic("/dev/root.old", root_device_name,
+ root_mountflags & ~MS_RDONLY);
init_mkdir("/old", 0700);
init_chdir("/old");

@@ -117,7 +118,7 @@ static void __init handle_initrd(void)

init_chdir("/");
ROOT_DEV = new_decode_dev(real_root_dev);
- mount_root();
+ mount_root(root_device_name);

printk(KERN_NOTICE "Trying to move old root to /initrd ... ");
error = init_mount("/old", "/root/initrd", NULL, MS_MOVE, NULL);
@@ -133,7 +134,7 @@ static void __init handle_initrd(void)
}
}

-bool __init initrd_load(void)
+bool __init initrd_load(char *root_device_name)
{
if (mount_initrd) {
create_dev("/dev/ram", Root_RAM0);
@@ -145,7 +146,7 @@ bool __init initrd_load(void)
*/
if (rd_load_image("/initrd.image") && ROOT_DEV != Root_RAM0) {
init_unlink("/initrd.image");
- handle_initrd();
+ handle_initrd(root_device_name);
return true;
}
}
--
2.39.2