do_mounts.c
上传用户:jlfgdled
上传日期:2013-04-10
资源大小:33168k
文件大小:24k
- #define __KERNEL_SYSCALLS__
- #include <linux/config.h>
- #include <linux/slab.h>
- #include <linux/devfs_fs_kernel.h>
- #include <linux/unistd.h>
- #include <linux/ctype.h>
- #include <linux/blk.h>
- #include <linux/fd.h>
- #include <linux/tty.h>
- #include <linux/init.h>
- #include <linux/nfs_fs.h>
- #include <linux/nfs_fs_sb.h>
- #include <linux/nfs_mount.h>
- #include <linux/minix_fs.h>
- #include <linux/ext2_fs.h>
- #include <linux/romfs_fs.h>
- #define BUILD_CRAMDISK
- extern int get_filesystem_list(char * buf);
- extern asmlinkage long sys_mount(char *dev_name, char *dir_name, char *type,
- unsigned long flags, void *data);
- extern asmlinkage long sys_mkdir(const char *name, int mode);
- extern asmlinkage long sys_chdir(const char *name);
- extern asmlinkage long sys_fchdir(int fd);
- extern asmlinkage long sys_chroot(const char *name);
- extern asmlinkage long sys_unlink(const char *name);
- extern asmlinkage long sys_symlink(const char *old, const char *new);
- extern asmlinkage long sys_mknod(const char *name, int mode, dev_t dev);
- extern asmlinkage long sys_umount(char *name, int flags);
- extern asmlinkage long sys_ioctl(int fd, int cmd, unsigned long arg);
- #ifdef CONFIG_BLK_DEV_INITRD
- unsigned int real_root_dev; /* do_proc_dointvec cannot handle kdev_t */
- static int __initdata mount_initrd = 1;
- static int __init no_initrd(char *str)
- {
- mount_initrd = 0;
- return 1;
- }
- __setup("noinitrd", no_initrd);
- #else
- static int __initdata mount_initrd = 0;
- #endif
- int __initdata rd_doload; /* 1 = load RAM disk, 0 = don't load */
- int root_mountflags = MS_RDONLY | MS_VERBOSE;
- static char root_device_name[64];
- /* this is initialized in init/main.c */
- kdev_t ROOT_DEV;
- static int do_devfs = 0;
- 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 struct dev_name_struct {
- const char *name;
- const int num;
- } root_dev_names[] __initdata = {
- { "nfs", 0x00ff },
- { "hda", 0x0300 },
- { "hdb", 0x0340 },
- { "loop", 0x0700 },
- { "hdc", 0x1600 },
- { "hdd", 0x1640 },
- { "hde", 0x2100 },
- { "hdf", 0x2140 },
- { "hdg", 0x2200 },
- { "hdh", 0x2240 },
- { "hdi", 0x3800 },
- { "hdj", 0x3840 },
- { "hdk", 0x3900 },
- { "hdl", 0x3940 },
- { "hdm", 0x5800 },
- { "hdn", 0x5840 },
- { "hdo", 0x5900 },
- { "hdp", 0x5940 },
- { "hdq", 0x5A00 },
- { "hdr", 0x5A40 },
- { "hds", 0x5B00 },
- { "hdt", 0x5B40 },
- { "sda", 0x0800 },
- { "sdb", 0x0810 },
- { "sdc", 0x0820 },
- { "sdd", 0x0830 },
- { "sde", 0x0840 },
- { "sdf", 0x0850 },
- { "sdg", 0x0860 },
- { "sdh", 0x0870 },
- { "sdi", 0x0880 },
- { "sdj", 0x0890 },
- { "sdk", 0x08a0 },
- { "sdl", 0x08b0 },
- { "sdm", 0x08c0 },
- { "sdn", 0x08d0 },
- { "sdo", 0x08e0 },
- { "sdp", 0x08f0 },
- { "ada", 0x1c00 },
- { "adb", 0x1c10 },
- { "adc", 0x1c20 },
- { "add", 0x1c30 },
- { "ade", 0x1c40 },
- { "fd", 0x0200 },
- { "md", 0x0900 },
- { "xda", 0x0d00 },
- { "xdb", 0x0d40 },
- { "ram", 0x0100 },
- { "scd", 0x0b00 },
- { "mcd", 0x1700 },
- { "cdu535", 0x1800 },
- { "sonycd", 0x1800 },
- { "aztcd", 0x1d00 },
- { "cm206cd", 0x2000 },
- { "gscd", 0x1000 },
- { "sbpcd", 0x1900 },
- { "eda", 0x2400 },
- { "edb", 0x2440 },
- { "pda", 0x2d00 },
- { "pdb", 0x2d10 },
- { "pdc", 0x2d20 },
- { "pdd", 0x2d30 },
- { "pcd", 0x2e00 },
- { "pf", 0x2f00 },
- { "apblock", APBLOCK_MAJOR << 8},
- { "ddv", DDV_MAJOR << 8},
- { "jsfd", JSFD_MAJOR << 8},
- #if defined(CONFIG_ARCH_S390)
- { "dasda", (DASD_MAJOR << MINORBITS) },
- { "dasdb", (DASD_MAJOR << MINORBITS) + (1 << 2) },
- { "dasdc", (DASD_MAJOR << MINORBITS) + (2 << 2) },
- { "dasdd", (DASD_MAJOR << MINORBITS) + (3 << 2) },
- { "dasde", (DASD_MAJOR << MINORBITS) + (4 << 2) },
- { "dasdf", (DASD_MAJOR << MINORBITS) + (5 << 2) },
- { "dasdg", (DASD_MAJOR << MINORBITS) + (6 << 2) },
- { "dasdh", (DASD_MAJOR << MINORBITS) + (7 << 2) },
- #endif
- #if defined(CONFIG_BLK_CPQ_DA) || defined(CONFIG_BLK_CPQ_DA_MODULE)
- { "ida/c0d0p",0x4800 },
- { "ida/c0d1p",0x4810 },
- { "ida/c0d2p",0x4820 },
- { "ida/c0d3p",0x4830 },
- { "ida/c0d4p",0x4840 },
- { "ida/c0d5p",0x4850 },
- { "ida/c0d6p",0x4860 },
- { "ida/c0d7p",0x4870 },
- { "ida/c0d8p",0x4880 },
- { "ida/c0d9p",0x4890 },
- { "ida/c0d10p",0x48A0 },
- { "ida/c0d11p",0x48B0 },
- { "ida/c0d12p",0x48C0 },
- { "ida/c0d13p",0x48D0 },
- { "ida/c0d14p",0x48E0 },
- { "ida/c0d15p",0x48F0 },
- { "ida/c1d0p",0x4900 },
- { "ida/c2d0p",0x4A00 },
- { "ida/c3d0p",0x4B00 },
- { "ida/c4d0p",0x4C00 },
- { "ida/c5d0p",0x4D00 },
- { "ida/c6d0p",0x4E00 },
- { "ida/c7d0p",0x4F00 },
- #endif
- #if defined(CONFIG_BLK_CPQ_CISS_DA) || defined(CONFIG_BLK_CPQ_CISS_DA_MODULE)
- { "cciss/c0d0p",0x6800 },
- { "cciss/c0d1p",0x6810 },
- { "cciss/c0d2p",0x6820 },
- { "cciss/c0d3p",0x6830 },
- { "cciss/c0d4p",0x6840 },
- { "cciss/c0d5p",0x6850 },
- { "cciss/c0d6p",0x6860 },
- { "cciss/c0d7p",0x6870 },
- { "cciss/c0d8p",0x6880 },
- { "cciss/c0d9p",0x6890 },
- { "cciss/c0d10p",0x68A0 },
- { "cciss/c0d11p",0x68B0 },
- { "cciss/c0d12p",0x68C0 },
- { "cciss/c0d13p",0x68D0 },
- { "cciss/c0d14p",0x68E0 },
- { "cciss/c0d15p",0x68F0 },
- { "cciss/c1d0p",0x6900 },
- { "cciss/c2d0p",0x6A00 },
- { "cciss/c3d0p",0x6B00 },
- { "cciss/c4d0p",0x6C00 },
- { "cciss/c5d0p",0x6D00 },
- { "cciss/c6d0p",0x6E00 },
- { "cciss/c7d0p",0x6F00 },
- #endif
- { "ataraid/d0p",0x7200 },
- { "ataraid/d1p",0x7210 },
- { "ataraid/d2p",0x7220 },
- { "ataraid/d3p",0x7230 },
- { "ataraid/d4p",0x7240 },
- { "ataraid/d5p",0x7250 },
- { "ataraid/d6p",0x7260 },
- { "ataraid/d7p",0x7270 },
- { "ataraid/d8p",0x7280 },
- { "ataraid/d9p",0x7290 },
- { "ataraid/d10p",0x72A0 },
- { "ataraid/d11p",0x72B0 },
- { "ataraid/d12p",0x72C0 },
- { "ataraid/d13p",0x72D0 },
- { "ataraid/d14p",0x72E0 },
- { "ataraid/d15p",0x72F0 },
- { "nftla", 0x5d00 },
- { "nftlb", 0x5d10 },
- { "nftlc", 0x5d20 },
- { "nftld", 0x5d30 },
- { "ftla", 0x2c00 },
- { "ftlb", 0x2c08 },
- { "ftlc", 0x2c10 },
- { "ftld", 0x2c18 },
- { "mtdblock", 0x1f00 },
- { NULL, 0 }
- };
- kdev_t __init name_to_kdev_t(char *line)
- {
- int base = 0, offs;
- char *end;
- if (strncmp(line,"/dev/",5) == 0) {
- struct dev_name_struct *dev = root_dev_names;
- line += 5;
- do {
- int len = strlen(dev->name);
- if (strncmp(line,dev->name,len) == 0) {
- line += len;
- base = dev->num;
- break;
- }
- dev++;
- } while (dev->name);
- }
- offs = simple_strtoul(line, &end, base?10:16);
- if (*end)
- offs = 0;
- return to_kdev_t(base + offs);
- }
- static int __init root_dev_setup(char *line)
- {
- int i;
- char ch;
- ROOT_DEV = name_to_kdev_t(line);
- memset (root_device_name, 0, sizeof root_device_name);
- if (strncmp (line, "/dev/", 5) == 0) line += 5;
- for (i = 0; i < sizeof root_device_name - 1; ++i)
- {
- ch = line[i];
- if ( isspace (ch) || (ch == ',') || (ch == ' ') ) break;
- root_device_name[i] = ch;
- }
- 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] = ' ';
- }
- } else {
- int len = get_filesystem_list(page);
- char *p, *next;
- page[len] = ' ';
- for (p = page-1; p; p = next) {
- next = strchr(++p, 'n');
- if (*p++ != 't')
- continue;
- while ((*s++ = *p++) != 'n')
- ;
- s[-1] = ' ';
- }
- }
- *s = ' ';
- }
- static void __init mount_block_root(char *name, int flags)
- {
- char *fs_names = __getname();
- char *p;
- get_fs_names(fs_names);
- retry:
- for (p = fs_names; *p; p += strlen(p)+1) {
- int err = sys_mount(name, "/root", 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.
- */
- printk ("VFS: Cannot open root device "%s" or %sn",
- root_device_name, kdevname (ROOT_DEV));
- printk ("Please append a correct "root=" boot optionn");
- panic("VFS: Unable to mount root fs on %s",
- kdevname(ROOT_DEV));
- }
- panic("VFS: Unable to mount root fs on %s", kdevname(ROOT_DEV));
- out:
- putname(fs_names);
- 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" : "");
- }
-
- #ifdef CONFIG_ROOT_NFS
- static int __init mount_nfs_root(void)
- {
- void *data = nfs_root_data();
- if (data && sys_mount("/dev/root","/root","nfs",root_mountflags,data) == 0)
- return 1;
- return 0;
- }
- #endif
- static int __init create_dev(char *name, kdev_t dev, char *devfs_name)
- {
- void *handle;
- char path[64];
- int n;
- sys_unlink(name);
- if (!do_devfs)
- return sys_mknod(name, S_IFBLK|0600, kdev_t_to_nr(dev));
- handle = devfs_find_handle(NULL, dev ? NULL : devfs_name,
- MAJOR(dev), MINOR(dev), DEVFS_SPECIAL_BLK, 1);
- if (!handle)
- return -1;
- n = devfs_generate_path(handle, path + 5, sizeof (path) - 5);
- if (n < 0)
- return -1;
- return sys_symlink(path + n + 5, name);
- }
- #if defined(CONFIG_BLK_DEV_RAM) || defined(CONFIG_BLK_DEV_FD)
- static 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 ENTERn", 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
- #ifdef CONFIG_BLK_DEV_RAM
- int __initdata rd_prompt = 1; /* 1 = prompt for RAM disk, 0 = don't prompt */
- static int __init prompt_ramdisk(char *str)
- {
- rd_prompt = simple_strtol(str,NULL,0) & 1;
- return 1;
- }
- __setup("prompt_ramdisk=", prompt_ramdisk);
- int __initdata rd_image_start; /* starting block # of image */
- static int __init ramdisk_start_setup(char *str)
- {
- rd_image_start = simple_strtol(str,NULL,0);
- return 1;
- }
- __setup("ramdisk_start=", ramdisk_start_setup);
- static int __init crd_load(int in_fd, int out_fd);
- /*
- * This routine tries to find a RAM disk image to load, and returns the
- * number of blocks to read for a non-compressed image, 0 if the image
- * is a compressed image, and -1 if an image with the right magic
- * numbers could not be found.
- *
- * We currently check for the following magic numbers:
- * minix
- * ext2
- * romfs
- * gzip
- */
- static int __init
- identify_ramdisk_image(int fd, int start_block)
- {
- const int size = 512;
- struct minix_super_block *minixsb;
- struct ext2_super_block *ext2sb;
- struct romfs_super_block *romfsb;
- int nblocks = -1;
- unsigned char *buf;
- buf = kmalloc(size, GFP_KERNEL);
- if (buf == 0)
- return -1;
- minixsb = (struct minix_super_block *) buf;
- ext2sb = (struct ext2_super_block *) buf;
- romfsb = (struct romfs_super_block *) buf;
- memset(buf, 0xe5, size);
- /*
- * Read block 0 to test for gzipped kernel
- */
- lseek(fd, start_block * BLOCK_SIZE, 0);
- read(fd, buf, size);
- /*
- * If it matches the gzip magic numbers, return -1
- */
- if (buf[0] == 037 && ((buf[1] == 0213) || (buf[1] == 0236))) {
- printk(KERN_NOTICE
- "RAMDISK: Compressed image found at block %dn",
- start_block);
- nblocks = 0;
- goto done;
- }
- /* romfs is at block zero too */
- if (romfsb->word0 == ROMSB_WORD0 &&
- romfsb->word1 == ROMSB_WORD1) {
- printk(KERN_NOTICE
- "RAMDISK: romfs filesystem found at block %dn",
- start_block);
- nblocks = (ntohl(romfsb->size)+BLOCK_SIZE-1)>>BLOCK_SIZE_BITS;
- goto done;
- }
- /*
- * Read block 1 to test for minix and ext2 superblock
- */
- lseek(fd, (start_block+1) * BLOCK_SIZE, 0);
- read(fd, buf, size);
- /* Try minix */
- if (minixsb->s_magic == MINIX_SUPER_MAGIC ||
- minixsb->s_magic == MINIX_SUPER_MAGIC2) {
- printk(KERN_NOTICE
- "RAMDISK: Minix filesystem found at block %dn",
- start_block);
- nblocks = minixsb->s_nzones << minixsb->s_log_zone_size;
- goto done;
- }
- /* Try ext2 */
- if (ext2sb->s_magic == cpu_to_le16(EXT2_SUPER_MAGIC)) {
- printk(KERN_NOTICE
- "RAMDISK: ext2 filesystem found at block %dn",
- start_block);
- nblocks = le32_to_cpu(ext2sb->s_blocks_count);
- goto done;
- }
- printk(KERN_NOTICE
- "RAMDISK: Couldn't find valid RAM disk image starting at %d.n",
- start_block);
-
- done:
- lseek(fd, start_block * BLOCK_SIZE, 0);
- kfree(buf);
- return nblocks;
- }
- #endif
- static int __init rd_load_image(char *from)
- {
- int res = 0;
- #ifdef CONFIG_BLK_DEV_RAM
- int in_fd, out_fd;
- unsigned long rd_blocks, devblocks;
- int nblocks, i;
- char *buf;
- unsigned short rotate = 0;
- #if !defined(CONFIG_ARCH_S390) && !defined(CONFIG_PPC_ISERIES)
- char rotator[4] = { '|' , '/' , '-' , '\' };
- #endif
- out_fd = open("/dev/ram", O_RDWR, 0);
- if (out_fd < 0)
- goto out;
- in_fd = open(from, O_RDONLY, 0);
- if (in_fd < 0)
- goto noclose_input;
- nblocks = identify_ramdisk_image(in_fd, rd_image_start);
- if (nblocks < 0)
- goto done;
- if (nblocks == 0) {
- #ifdef BUILD_CRAMDISK
- if (crd_load(in_fd, out_fd) == 0)
- goto successful_load;
- #else
- printk(KERN_NOTICE
- "RAMDISK: Kernel does not support compressed "
- "RAM disk imagesn");
- #endif
- goto done;
- }
- /*
- * NOTE NOTE: nblocks suppose that the blocksize is BLOCK_SIZE, so
- * rd_load_image will work only with filesystem BLOCK_SIZE wide!
- * So make sure to use 1k blocksize while generating ext2fs
- * ramdisk-images.
- */
- if (sys_ioctl(out_fd, BLKGETSIZE, (unsigned long)&rd_blocks) < 0)
- rd_blocks = 0;
- else
- rd_blocks >>= 1;
- if (nblocks > rd_blocks) {
- printk("RAMDISK: image too big! (%d/%d blocks)n",
- nblocks, rd_blocks);
- goto done;
- }
-
- /*
- * OK, time to copy in the data
- */
- buf = kmalloc(BLOCK_SIZE, GFP_KERNEL);
- if (buf == 0) {
- printk(KERN_ERR "RAMDISK: could not allocate buffern");
- goto done;
- }
- if (sys_ioctl(in_fd, BLKGETSIZE, (unsigned long)&devblocks) < 0)
- devblocks = 0;
- else
- devblocks >>= 1;
- if (strcmp(from, "/dev/initrd") == 0)
- devblocks = nblocks;
- if (devblocks == 0) {
- printk(KERN_ERR "RAMDISK: could not determine device sizen");
- goto done;
- }
- printk(KERN_NOTICE "RAMDISK: Loading %d blocks [%d disk%s] into ram disk... ",
- nblocks, ((nblocks-1)/devblocks)+1, nblocks>devblocks ? "s" : "");
- for (i=0; i < nblocks; i++) {
- if (i && (i % devblocks == 0)) {
- printk("done disk #%d.n", i/devblocks);
- rotate = 0;
- if (close(in_fd)) {
- printk("Error closing the disk.n");
- goto noclose_input;
- }
- change_floppy("disk #%d", i/devblocks+1);
- in_fd = open(from, O_RDONLY, 0);
- if (in_fd < 0) {
- printk("Error opening disk.n");
- goto noclose_input;
- }
- printk("Loading disk #%d... ", i/devblocks+1);
- }
- read(in_fd, buf, BLOCK_SIZE);
- write(out_fd, buf, BLOCK_SIZE);
- #if !defined(CONFIG_ARCH_S390) && !defined(CONFIG_PPC_ISERIES)
- if (!(i % 16)) {
- printk("%cb", rotator[rotate & 0x3]);
- rotate++;
- }
- #endif
- }
- printk("done.n");
- kfree(buf);
- successful_load:
- res = 1;
- done:
- close(in_fd);
- noclose_input:
- close(out_fd);
- out:
- sys_unlink("/dev/ram");
- #endif
- return res;
- }
- static int __init rd_load_disk(int n)
- {
- #ifdef CONFIG_BLK_DEV_RAM
- if (rd_prompt)
- change_floppy("root floppy disk to be loaded into RAM disk");
- create_dev("/dev/ram", MKDEV(RAMDISK_MAJOR, n), NULL);
- #endif
- return rd_load_image("/dev/root");
- }
- #ifdef CONFIG_DEVFS_FS
- static void __init convert_name(char *prefix, char *name, char *p, int part)
- {
- int host, bus, target, lun;
- char dest[64];
- char src[64];
- char *base = p - 1;
- /* Decode "c#b#t#u#" */
- if (*p++ != 'c')
- return;
- host = simple_strtol(p, &p, 10);
- if (*p++ != 'b')
- return;
- bus = simple_strtol(p, &p, 10);
- if (*p++ != 't')
- return;
- target = simple_strtol(p, &p, 10);
- if (*p++ != 'u')
- return;
- lun = simple_strtol(p, &p, 10);
- if (!part)
- sprintf(dest, "%s/host%d/bus%d/target%d/lun%d",
- prefix, host, bus, target, lun);
- else if (*p++ == 'p')
- sprintf(dest, "%s/host%d/bus%d/target%d/lun%d/part%s",
- prefix, host, bus, target, lun, p);
- else
- sprintf(dest, "%s/host%d/bus%d/target%d/lun%d/disc",
- prefix, host, bus, target, lun);
- *base = ' ';
- sprintf(src, "/dev/%s", name);
- sys_mkdir(src, 0755);
- *base = '/';
- sprintf(src, "/dev/%s", name);
- sys_symlink(dest, src);
- }
- static void __init devfs_make_root(char *name)
- {
- if (!strncmp(name, "sd/", 3))
- convert_name("../scsi", name, name+3, 1);
- else if (!strncmp(name, "sr/", 3))
- convert_name("../scsi", name, name+3, 0);
- else if (!strncmp(name, "ide/hd/", 7))
- convert_name("..", name, name + 7, 1);
- else if (!strncmp(name, "ide/cd/", 7))
- convert_name("..", name, name + 7, 0);
- }
- #else
- static void __init devfs_make_root(char *name)
- {
- }
- #endif
- static void __init mount_root(void)
- {
- #ifdef CONFIG_ROOT_NFS
- if (MAJOR(ROOT_DEV) == UNNAMED_MAJOR) {
- if (mount_nfs_root()) {
- sys_chdir("/root");
- ROOT_DEV = current->fs->pwdmnt->mnt_sb->s_dev;
- printk("VFS: Mounted root (nfs filesystem).n");
- return;
- }
- printk(KERN_ERR "VFS: Unable to mount root fs via NFS, trying floppy.n");
- ROOT_DEV = MKDEV(FLOPPY_MAJOR, 0);
- }
- #endif
- devfs_make_root(root_device_name);
- create_dev("/dev/root", ROOT_DEV, root_device_name);
- #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 = MKDEV(RAMDISK_MAJOR, 1);
- create_dev("/dev/root", ROOT_DEV, NULL);
- }
- } else
- change_floppy("root floppy");
- }
- #endif
- mount_block_root("/dev/root", root_mountflags);
- }
- #ifdef CONFIG_BLK_DEV_INITRD
- static int old_fd, root_fd;
- static int do_linuxrc(void * shell)
- {
- static char *argv[] = { "linuxrc", NULL, };
- extern char * envp_init[];
- close(old_fd);
- close(root_fd);
- close(0);
- close(1);
- close(2);
- setsid();
- (void) open("/dev/console",O_RDWR,0);
- (void) dup(0);
- (void) dup(0);
- return execve(shell, argv, envp_init);
- }
- #endif
- static void __init handle_initrd(void)
- {
- #ifdef CONFIG_BLK_DEV_INITRD
- int ram0 = kdev_t_to_nr(MKDEV(RAMDISK_MAJOR,0));
- int error;
- int i, pid;
- create_dev("/dev/root.old", ram0, NULL);
- /* mount initrd on rootfs' /root */
- mount_block_root("/dev/root.old", root_mountflags & ~MS_RDONLY);
- sys_mkdir("/old", 0700);
- root_fd = open("/", 0, 0);
- old_fd = open("/old", 0, 0);
- /* move initrd over / and chdir/chroot in initrd root */
- sys_chdir("/root");
- sys_mount(".", "/", NULL, MS_MOVE, NULL);
- sys_chroot(".");
- mount_devfs_fs ();
- pid = kernel_thread(do_linuxrc, "/linuxrc", SIGCHLD);
- if (pid > 0) {
- while (pid != wait(&i))
- yield();
- }
- /* move initrd to rootfs' /old */
- sys_fchdir(old_fd);
- sys_mount("/", ".", NULL, MS_MOVE, NULL);
- /* switch root and cwd back to / of rootfs */
- sys_fchdir(root_fd);
- sys_chroot(".");
- sys_umount("/old/dev", 0);
- if (real_root_dev == ram0) {
- sys_chdir("/old");
- return;
- }
- ROOT_DEV = real_root_dev;
- mount_root();
- printk(KERN_NOTICE "Trying to move old root to /initrd ... ");
- error = sys_mount("/old", "/root/initrd", NULL, MS_MOVE, NULL);
- if (!error)
- printk("okayn");
- else {
- int fd = open("/dev/root.old", O_RDWR, 0);
- printk("failedn");
- printk(KERN_NOTICE "Unmounting old rootn");
- sys_umount("/old", MNT_DETACH);
- printk(KERN_NOTICE "Trying to free ramdisk memory ... ");
- if (fd < 0) {
- error = fd;
- } else {
- error = sys_ioctl(fd, BLKFLSBUF, 0);
- close(fd);
- }
- printk(!error ? "okayn" : "failedn");
- }
- #endif
- }
- static int __init initrd_load(void)
- {
- #ifdef CONFIG_BLK_DEV_INITRD
- create_dev("/dev/ram", MKDEV(RAMDISK_MAJOR, 0), NULL);
- create_dev("/dev/initrd", MKDEV(RAMDISK_MAJOR, INITRD_MINOR), NULL);
- #endif
- return rd_load_image("/dev/initrd");
- }
- /*
- * Prepare the namespace - decide what/where to mount, load ramdisks, etc.
- */
- void prepare_namespace(void)
- {
- int is_floppy = MAJOR(ROOT_DEV) == FLOPPY_MAJOR;
- #ifdef CONFIG_ALL_PPC
- extern void arch_discover_root(void);
- arch_discover_root();
- #endif /* CONFIG_ALL_PPC */
- #ifdef CONFIG_BLK_DEV_INITRD
- if (!initrd_start)
- mount_initrd = 0;
- real_root_dev = ROOT_DEV;
- #endif
- sys_mkdir("/dev", 0700);
- sys_mkdir("/root", 0700);
- sys_mknod("/dev/console", S_IFCHR|0600, MKDEV(TTYAUX_MAJOR, 1));
- #ifdef CONFIG_DEVFS_FS
- sys_mount("devfs", "/dev", "devfs", 0, NULL);
- do_devfs = 1;
- #endif
- create_dev("/dev/root", ROOT_DEV, NULL);
- if (mount_initrd) {
- if (initrd_load() && ROOT_DEV != MKDEV(RAMDISK_MAJOR, 0)) {
- handle_initrd();
- goto out;
- }
- } else if (is_floppy && rd_doload && rd_load_disk(0))
- ROOT_DEV = MKDEV(RAMDISK_MAJOR, 0);
- mount_root();
- out:
- sys_umount("/dev", 0);
- sys_mount(".", "/", NULL, MS_MOVE, NULL);
- sys_chroot(".");
- mount_devfs_fs ();
- }
- #if defined(BUILD_CRAMDISK) && defined(CONFIG_BLK_DEV_RAM)
- /*
- * gzip declarations
- */
- #define OF(args) args
- #ifndef memzero
- #define memzero(s, n) memset ((s), 0, (n))
- #endif
- typedef unsigned char uch;
- typedef unsigned short ush;
- typedef unsigned long ulg;
- #define INBUFSIZ 4096
- #define WSIZE 0x8000 /* window size--must be a power of two, and */
- /* at least 32K for zip's deflate method */
- static uch *inbuf;
- static uch *window;
- static unsigned insize; /* valid bytes in inbuf */
- static unsigned inptr; /* index of next byte to be processed in inbuf */
- static unsigned outcnt; /* bytes in output buffer */
- static int exit_code;
- static long bytes_out;
- static int crd_infd, crd_outfd;
- #define get_byte() (inptr < insize ? inbuf[inptr++] : fill_inbuf())
-
- /* Diagnostic functions (stubbed out) */
- #define Assert(cond,msg)
- #define Trace(x)
- #define Tracev(x)
- #define Tracevv(x)
- #define Tracec(c,x)
- #define Tracecv(c,x)
- #define STATIC static
- static int fill_inbuf(void);
- static void flush_window(void);
- static void *malloc(int size);
- static void free(void *where);
- static void error(char *m);
- static void gzip_mark(void **);
- static void gzip_release(void **);
- #include "../lib/inflate.c"
- static void __init *malloc(int size)
- {
- return kmalloc(size, GFP_KERNEL);
- }
- static void __init free(void *where)
- {
- kfree(where);
- }
- static void __init gzip_mark(void **ptr)
- {
- }
- static void __init gzip_release(void **ptr)
- {
- }
- /* ===========================================================================
- * Fill the input buffer. This is called only when the buffer is empty
- * and at least one byte is really needed.
- */
- static int __init fill_inbuf(void)
- {
- if (exit_code) return -1;
-
- insize = read(crd_infd, inbuf, INBUFSIZ);
- if (insize == 0) return -1;
- inptr = 1;
- return inbuf[0];
- }
- /* ===========================================================================
- * Write the output window window[0..outcnt-1] and update crc and bytes_out.
- * (Used for the decompressed data only.)
- */
- static void __init flush_window(void)
- {
- ulg c = crc; /* temporary variable */
- unsigned n;
- uch *in, ch;
-
- write(crd_outfd, window, outcnt);
- in = window;
- for (n = 0; n < outcnt; n++) {
- ch = *in++;
- c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8);
- }
- crc = c;
- bytes_out += (ulg)outcnt;
- outcnt = 0;
- }
- static void __init error(char *x)
- {
- printk(KERN_ERR "%s", x);
- exit_code = 1;
- }
- static int __init crd_load(int in_fd, int out_fd)
- {
- int result;
- insize = 0; /* valid bytes in inbuf */
- inptr = 0; /* index of next byte to be processed in inbuf */
- outcnt = 0; /* bytes in output buffer */
- exit_code = 0;
- bytes_out = 0;
- crc = (ulg)0xffffffffL; /* shift register contents */
- crd_infd = in_fd;
- crd_outfd = out_fd;
- inbuf = kmalloc(INBUFSIZ, GFP_KERNEL);
- if (inbuf == 0) {
- printk(KERN_ERR "RAMDISK: Couldn't allocate gzip buffern");
- return -1;
- }
- window = kmalloc(WSIZE, GFP_KERNEL);
- if (window == 0) {
- printk(KERN_ERR "RAMDISK: Couldn't allocate gzip windown");
- kfree(inbuf);
- return -1;
- }
- makecrc();
- result = gunzip();
- kfree(inbuf);
- kfree(window);
- return result;
- }
- #endif /* BUILD_CRAMDISK && CONFIG_BLK_DEV_RAM */