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SubjectVFS: Cannot open root device "304" or hda4

Hi to all, this is my first post on LKML.

I'm trying 2.6.0-test2-mm2 and the compiling process ends with no errors
except for some warnings about oss modules.
After reboot with the 2.6 I obtain a kernel panic error:

**************************************
VFS: Cannot open root device "304" or hda4
Please append a correct "root=" boot option
VFS: Unable to mount root fs on hda4;
**************************************
I've read old ML posts but the don't help me.
According to 2.4.21, the root fs is /dev/hda4: I've tried to give "root=0304"
or "root=/dev/hda4" at the 2.6, but I obtain the same errors.
I've even tried initrd with no changes.

I've introduced some printk in init/do_mount.c (see the linked file at line
64) and before the kernel panic, the result was :

***************************************
name hda4 - /sys/block/hda4/dev
descriptor -1

name hda - /sys/block/hda/dev
descriptor 0

scanning '3:0'
***************************************

Is it normal?

Thanks a lot.
Mario

PS: sorry for my 'bad' english.. I'm learning...


#include <linux/sched.h>
#include <linux/ctype.h>
#include <linux/fd.h>
#include <linux/tty.h>
#include <linux/suspend.h>
#include <linux/root_dev.h>
#include <linux/security.h>

#include <linux/nfs_fs.h>
#include <linux/nfs_fs_sb.h>
#include <linux/nfs_mount.h>

#include "do_mounts.h"

extern int get_filesystem_list(char * buf);

int __initdata rd_doload; /* 1 = load RAM disk, 0 = don't load */

int root_mountflags = MS_RDONLY | MS_VERBOSE;
char * __initdata root_device_name;
static char __initdata saved_root_name[64];

/* this is initialized in init/main.c */
dev_t ROOT_DEV;

static int __init load_ramdisk(char *str)
{
rd_doload = simple_strtol(str,NULL,0) & 3;
return 1;
}
__setup("load_ramdisk=", load_ramdisk);

static int __init readonly(char *str)
{
if (*str)
return 0;
root_mountflags |= MS_RDONLY;
return 1;
}

static int __init readwrite(char *str)
{
if (*str)
return 0;
root_mountflags &= ~MS_RDONLY;
return 1;
}

__setup("ro", readonly);
__setup("rw", readwrite);

static dev_t __init try_name(char *name, int part)
{
char path[64];
char buf[32];
int range;
dev_t res;
char *s;
int len;
int fd;
unsigned int maj, min;

/* read device number from .../dev */

sprintf(path, "/sys/block/%s/dev", name);
printk("name %s - path %s\n",name, path);
fd = open(path, 0, 0);
printk("descriptor %d\n",fd);
if (fd < 0)
goto fail;
len = read(fd, buf, 32);
close(fd);
if (len <= 0 || len == 32 || buf[len - 1] != '\n')
goto fail;
buf[len - 1] = '\0';
/*
* The format of dev is now %u:%u -- see print_dev_t()
*/
printk("scanning `%s'\n", buf);
if (sscanf(buf, "%u:%u", &maj, &min) == 2)
res = MKDEV(maj, min);
else
goto fail;

/* if it's there and we are not looking for a partition - that's it */
if (!part)
return res;

/* otherwise read range from .../range */
sprintf(path, "/sys/block/%s/range", name);
fd = open(path, 0, 0);
if (fd < 0)
goto fail;
len = read(fd, buf, 32);
close(fd);
if (len <= 0 || len == 32 || buf[len - 1] != '\n')
goto fail;
buf[len - 1] = '\0';
range = simple_strtoul(buf, &s, 10);
if (*s)
goto fail;

/* if partition is within range - we got it */
if (part < range)
return res + part;
fail:
return (dev_t) 0;
}

/*
* Convert a name into device number. We accept the following variants:
*
* 1) device number in hexadecimal represents itself
* 2) /dev/nfs represents Root_NFS (0xff)
* 3) /dev/<disk_name> represents the device number of disk
* 4) /dev/<disk_name><decimal> represents the device number
* of partition - device number of disk plus the partition number
* 5) /dev/<disk_name>p<decimal> - same as the above, that form is
* used when disk name of partitioned disk ends on a digit.
*
* If name doesn't have fall into the categories above, we return 0.
* Driverfs is used to check if something is a disk name - it has
* all known disks under bus/block/devices. If the disk name
* contains slashes, name of driverfs node has them replaced with
* dots. try_name() does the actual checks, assuming that driverfs
* is mounted on rootfs /sys.
*/

dev_t name_to_dev_t(char *name)
{
char s[32];
char *p;
dev_t res = 0;
int part;

sys_mkdir("/sys", 0700);
if (sys_mount("sysfs", "/sys", "sysfs", 0, NULL) < 0)
goto out;

if (strncmp(name, "/dev/", 5) != 0) {
res = (dev_t) simple_strtoul(name, &p, 16);
if (*p)
goto fail;
goto done;
}
name += 5;
res = Root_NFS;
if (strcmp(name, "nfs") == 0)
goto done;

if (strlen(name) > 31)
goto fail;
strcpy(s, name);
for (p = s; *p; p++)
if (*p == '/')
*p = '.';
res = try_name(s, 0);
if (res)
goto done;

while (p > s && isdigit(p[-1]))
p--;
if (p == s || !*p || *p == '0')
goto fail;
part = simple_strtoul(p, NULL, 10);
*p = '\0';
res = try_name(s, part);
if (res)
goto done;

if (p < s + 2 || !isdigit(p[-2]) || p[-1] != 'p')
goto fail;
p[-1] = '\0';
res = try_name(s, part);
done:
sys_umount("/sys", 0);
out:
sys_rmdir("/sys");
return res;
fail:
res = (dev_t) 0;
goto done;
}

static int __init root_dev_setup(char *line)
{
strlcpy(saved_root_name, line, sizeof(saved_root_name));
return 1;
}

__setup("root=", root_dev_setup);

static char * __initdata root_mount_data;
static int __init root_data_setup(char *str)
{
root_mount_data = str;
return 1;
}

static char * __initdata root_fs_names;
static int __init fs_names_setup(char *str)
{
root_fs_names = str;
return 1;
}

__setup("rootflags=", root_data_setup);
__setup("rootfstype=", fs_names_setup);

static void __init get_fs_names(char *page)
{
char *s = page;

if (root_fs_names) {
strcpy(page, root_fs_names);
while (*s++) {
if (s[-1] == ',')
s[-1] = '\0';
}
} else {
int len = get_filesystem_list(page);
char *p, *next;

page[len] = '\0';
for (p = page-1; p; p = next) {
next = strchr(++p, '\n');
if (*p++ != '\t')
continue;
while ((*s++ = *p++) != '\n')
;
s[-1] = '\0';
}
}
*s = '\0';
}

static int __init do_mount_root(char *name, char *fs, int flags, void *data)
{
int err = sys_mount(name, "/root", fs, flags, data);
if (err)
return err;

sys_chdir("/root");
ROOT_DEV = current->fs->pwdmnt->mnt_sb->s_dev;
printk("VFS: Mounted root (%s filesystem)%s.\n",
current->fs->pwdmnt->mnt_sb->s_type->name,
current->fs->pwdmnt->mnt_sb->s_flags & MS_RDONLY ?
" readonly" : "");
return 0;
}

void __init mount_block_root(char *name, int flags)
{
char *fs_names = __getname();
char *p;
char b[BDEVNAME_SIZE];

get_fs_names(fs_names);
retry:
for (p = fs_names; *p; p += strlen(p)+1) {
int err = do_mount_root(name, p, flags, root_mount_data);
switch (err) {
case 0:
goto out;
case -EACCES:
flags |= MS_RDONLY;
goto retry;
case -EINVAL:
continue;
}
/*
* Allow the user to distinguish between failed open
* and bad superblock on root device.
*/
__bdevname(ROOT_DEV, b);
printk("VFS: Cannot open root device \"%s\" or %s\n",
root_device_name, b);
printk("Please append a correct \"root=\" boot option\n");
panic("VFS: Unable to mount root fs on %s", b);
}
panic("VFS: Unable to mount root fs on %s", __bdevname(ROOT_DEV, b));
out:
putname(fs_names);
}

#ifdef CONFIG_ROOT_NFS
static int __init mount_nfs_root(void)
{
void *data = nfs_root_data();

create_dev("/dev/root", ROOT_DEV, NULL);
if (data &&
do_mount_root("/dev/root", "nfs", root_mountflags, data) == 0)
return 1;
return 0;
}
#endif

#if defined(CONFIG_BLK_DEV_RAM) || defined(CONFIG_BLK_DEV_FD)
void __init change_floppy(char *fmt, ...)
{
struct termios termios;
char buf[80];
char c;
int fd;
va_list args;
va_start(args, fmt);
vsprintf(buf, fmt, args);
va_end(args);
fd = open("/dev/root", O_RDWR | O_NDELAY, 0);
if (fd >= 0) {
sys_ioctl(fd, FDEJECT, 0);
close(fd);
}
printk(KERN_NOTICE "VFS: Insert %s and press ENTER\n", buf);
fd = open("/dev/console", O_RDWR, 0);
if (fd >= 0) {
sys_ioctl(fd, TCGETS, (long)&termios);
termios.c_lflag &= ~ICANON;
sys_ioctl(fd, TCSETSF, (long)&termios);
read(fd, &c, 1);
termios.c_lflag |= ICANON;
sys_ioctl(fd, TCSETSF, (long)&termios);
close(fd);
}
}
#endif

void __init mount_root(void)
{
#ifdef CONFIG_ROOT_NFS
if (MAJOR(ROOT_DEV) == UNNAMED_MAJOR) {
if (mount_nfs_root())
return;

printk(KERN_ERR "VFS: Unable to mount root fs via NFS, trying floppy.\n");
ROOT_DEV = Root_FD0;
}
#endif
#ifdef CONFIG_BLK_DEV_FD
if (MAJOR(ROOT_DEV) == FLOPPY_MAJOR) {
/* rd_doload is 2 for a dual initrd/ramload setup */
if (rd_doload==2) {
if (rd_load_disk(1)) {
ROOT_DEV = Root_RAM1;
root_device_name = NULL;
}
} else
change_floppy("root floppy");
}
#endif
create_dev("/dev/root", ROOT_DEV, root_device_name);
mount_block_root("/dev/root", root_mountflags);
}

/*
* Prepare the namespace - decide what/where to mount, load ramdisks, etc.
*/
void __init prepare_namespace(void)
{
int is_floppy;

mount_devfs();

md_run_setup();

if (saved_root_name[0]) {
root_device_name = saved_root_name;
ROOT_DEV = name_to_dev_t(root_device_name);
if (strncmp(root_device_name, "/dev/", 5) == 0)
root_device_name += 5;
}

is_floppy = MAJOR(ROOT_DEV) == FLOPPY_MAJOR;

/* This has to be before mounting root, because even readonly mount of reiserfs would replay
log corrupting stuff */
software_resume();

if (initrd_load())
goto out;

if (is_floppy && rd_doload && rd_load_disk(0))
ROOT_DEV = Root_RAM0;

mount_root();
out:
umount_devfs("/dev");
sys_mount(".", "/", NULL, MS_MOVE, NULL);
sys_chroot(".");
security_sb_post_mountroot();
mount_devfs_fs ();
}

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