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init: pass root_device_name explicitly

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

Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20230531125535.676098-9-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2023-05-31 14:55:19 +02:00 committed by Jens Axboe
parent a6a41d39c2
commit c8643c72bc
3 changed files with 29 additions and 25 deletions
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29
init/do_mounts.c
View File

@ -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 @@ out:
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 @@ retry:
* 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);

14
init/do_mounts.h
View File

@ -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

11
init/do_mounts_initrd.c
View File

@ -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;
}
}