Messages in this thread | | | From | kernel_286@hotmail ... | Date | Fri, 1 Aug 2003 17:05:24 +0200 | Subject | VFS: Cannot open root device "304" or hda4 |
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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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