patch-2.4.19 linux-2.4.19/init/do_mounts.c
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- Lines: 1011
- Date:
Fri Aug 2 17:39:46 2002
- Orig file:
linux-2.4.18/init/do_mounts.c
- Orig date:
Wed Dec 31 16:00:00 1969
diff -urN linux-2.4.18/init/do_mounts.c linux-2.4.19/init/do_mounts.c
@@ -0,0 +1,1010 @@
+#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);
+
+asmlinkage long sys_mount(char *dev_name, char *dir_name, char *type,
+ unsigned long flags, void *data);
+asmlinkage long sys_mkdir(char *name, int mode);
+asmlinkage long sys_chdir(char *name);
+asmlinkage long sys_chroot(char *name);
+asmlinkage long sys_unlink(char *name);
+asmlinkage long sys_symlink(char *old, char *new);
+asmlinkage long sys_mknod(char *name, int mode, dev_t dev);
+asmlinkage long sys_umount(char *name, int flags);
+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 },
+#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 },
+#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;
+
+ 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);
+ }
+ return to_kdev_t(base + simple_strtoul(line,NULL,base?10:16));
+}
+
+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 == '\0') ) 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] = '\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 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 %s\n",
+ root_device_name, kdevname (ROOT_DEV));
+ printk ("Please append a correct \"root=\" boot option\n");
+ 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 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
+
+#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 %d\n",
+ 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 %d\n",
+ 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 %d\n",
+ 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 %d\n",
+ 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;
+ int nblocks, rd_blocks, devblocks, 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 images\n");
+#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 buffer\n");
+ 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 size\n");
+ 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("%c\b", 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 = '\0';
+ 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 do_linuxrc(void * shell)
+{
+ static char *argv[] = { "linuxrc", NULL, };
+ extern char * envp_init[];
+
+ sys_chdir("/root");
+ sys_mount(".", "/", NULL, MS_MOVE, NULL);
+ sys_chroot(".");
+
+ mount_devfs_fs ();
+
+ 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_block_root("/dev/root.old", root_mountflags & ~MS_RDONLY);
+ sys_mkdir("/old", 0700);
+ sys_chdir("/old");
+
+ pid = kernel_thread(do_linuxrc, "/linuxrc", SIGCHLD);
+ if (pid > 0) {
+ while (pid != wait(&i)) {
+ current->policy |= SCHED_YIELD;
+ schedule();
+ }
+ }
+
+ sys_mount("..", ".", NULL, MS_MOVE, NULL);
+ 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("okay\n");
+ else {
+ int fd = open("/dev/root.old", O_RDWR, 0);
+ printk("failed\n");
+ printk(KERN_NOTICE "Unmounting old root\n");
+ 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 ? "okay\n" : "failed\n");
+ }
+#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 ();
+}
+
+#ifdef BUILD_CRAMDISK
+
+/*
+ * 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 buffer\n");
+ return -1;
+ }
+ window = kmalloc(WSIZE, GFP_KERNEL);
+ if (window == 0) {
+ printk(KERN_ERR "RAMDISK: Couldn't allocate gzip window\n");
+ kfree(inbuf);
+ return -1;
+ }
+ makecrc();
+ result = gunzip();
+ kfree(inbuf);
+ kfree(window);
+ return result;
+}
+
+#endif /* BUILD_CRAMDISK */
FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen (who was at: slshen@lbl.gov)