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Commit c5e3ab0e authored by Kai Germaschewski's avatar Kai Germaschewski
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Merge tp1.ruhr-uni-bochum.de:/scratch/kai/kernel/v2.5/linux-2.5.do_mounts.tmp 

into tp1.ruhr-uni-bochum.de:/scratch/kai/kernel/v2.5/linux-2.5.do_mounts
parents 9b48c576 b776ff47
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Showing with 1043 additions and 976 deletions
init/Makefile
View file @ c5e3ab0e
......@@ -3,6 +3,9 @@
#
obj-y := main.o version.o do_mounts.o initramfs.o
obj-$(CONFIG_DEVFS_FS) += do_mounts_devfs.o
obj-$(CONFIG_BLK_DEV_RAM) += do_mounts_rd.o
obj-$(CONFIG_BLK_DEV_MD) += do_mounts_md.o
# files to be removed upon make clean
clean-files := ../include/linux/compile.h
......
init/do_mounts.c
View file @ c5e3ab0e
#define __KERNEL_SYSCALLS__
#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/sched.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/suspend.h>
#include <linux/root_dev.h>
#include <linux/mount.h>
#include <linux/dirent.h>
#include <linux/security.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>
#include <linux/raid/md.h>
#define BUILD_CRAMDISK
#include "do_mounts.h"
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_rmdir(const char *name);
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);
extern asmlinkage long sys_access(const char * filename, int mode);
extern asmlinkage long sys_newstat(char * filename, struct stat * statbuf);
extern asmlinkage long sys_getdents64(unsigned int fd, void * dirent,
unsigned int count);
#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];
static char saved_root_name[64];
static 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 do_devfs = 0;
static int __init load_ramdisk(char *str)
{
rd_doload = simple_strtol(str,NULL,0) & 3;
......@@ -98,7 +49,7 @@ static int __init readwrite(char *str)
__setup("ro", readonly);
__setup("rw", readwrite);
static __init dev_t try_name(char *name, int part)
static dev_t __init try_name(char *name, int part)
{
char path[64];
char buf[32];
......@@ -167,7 +118,7 @@ static __init dev_t try_name(char *name, int part)
* is mounted on rootfs /sys.
*/
__init dev_t name_to_dev_t(char *name)
dev_t name_to_dev_t(char *name)
{
char s[32];
char *p;
......@@ -225,8 +176,7 @@ __init dev_t name_to_dev_t(char *name)
static int __init root_dev_setup(char *line)
{
strncpy(saved_root_name, line, 64);
saved_root_name[63] = '\0';
strncpy(saved_root_name, line, 63);
return 1;
}
......@@ -275,7 +225,23 @@ static void __init get_fs_names(char *page)
}
*s = '\0';
}
static void __init mount_block_root(char *name, int flags)
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;
......@@ -283,7 +249,7 @@ static void __init mount_block_root(char *name, int flags)
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);
int err = do_mount_root(name, p, flags, root_mount_data);
switch (err) {
case 0:
goto out;
......@@ -305,11 +271,6 @@ static void __init mount_block_root(char *name, int flags)
panic("VFS: Unable to mount root fs on %s", __bdevname(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
......@@ -317,139 +278,16 @@ static int __init mount_nfs_root(void)
{
void *data = nfs_root_data();
if (data && sys_mount("/dev/root","/root","nfs",root_mountflags,data) == 0)
create_dev("/dev/root", ROOT_DEV, NULL);
if (data &&
do_mount_root("/dev/root", "nfs", root_mountflags, data) == 0)
return 1;
return 0;
}
#endif
#ifdef CONFIG_DEVFS_FS
/*
* If the dir will fit in *buf, return its length. If it won't fit, return
* zero. Return -ve on error.
*/
static int __init do_read_dir(int fd, void *buf, int len)
{
long bytes, n;
char *p = buf;
lseek(fd, 0, 0);
for (bytes = 0; bytes < len; bytes += n) {
n = sys_getdents64(fd, p + bytes, len - bytes);
if (n < 0)
return n;
if (n == 0)
return bytes;
}
return 0;
}
/*
* Try to read all of a directory. Returns the contents at *p, which
* is kmalloced memory. Returns the number of bytes read at *len. Returns
* NULL on error.
*/
static void * __init read_dir(char *path, int *len)
{
int size;
int fd = open(path, 0, 0);
*len = 0;
if (fd < 0)
return NULL;
for (size = 1 << 9; size <= (1 << MAX_ORDER); size <<= 1) {
void *p = kmalloc(size, GFP_KERNEL);
int n;
if (!p)
break;
n = do_read_dir(fd, p, size);
if (n > 0) {
close(fd);
*len = n;
return p;
}
kfree(p);
if (n == -EINVAL)
continue; /* Try a larger buffer */
if (n < 0)
break;
}
close(fd);
return NULL;
}
#endif
static int __init find_in_devfs(char *path, dev_t dev)
{
#ifdef CONFIG_DEVFS_FS
struct stat buf;
char *end = path + strlen(path);
int rest = path + 64 - end;
int size;
char *p = read_dir(path, &size);
char *s;
if (!p)
return -1;
for (s = p; s < p + size; s += ((struct linux_dirent64 *)s)->d_reclen) {
struct linux_dirent64 *d = (struct linux_dirent64 *)s;
if (strlen(d->d_name) + 2 > rest)
continue;
switch (d->d_type) {
case DT_BLK:
sprintf(end, "/%s", d->d_name);
if (sys_newstat(path, &buf) < 0)
break;
if (!S_ISBLK(buf.st_mode))
break;
if (buf.st_rdev != dev)
break;
kfree(p);
return 0;
case DT_DIR:
if (strcmp(d->d_name, ".") == 0)
break;
if (strcmp(d->d_name, "..") == 0)
break;
sprintf(end, "/%s", d->d_name);
if (find_in_devfs(path, dev) < 0)
break;
kfree(p);
return 0;
}
}
kfree(p);
#endif
return -1;
}
static int __init create_dev(char *name, dev_t dev, char *devfs_name)
{
char path[64];
sys_unlink(name);
if (!do_devfs)
return sys_mknod(name, S_IFBLK|0600, dev);
if (devfs_name && devfs_name[0]) {
if (strncmp(devfs_name, "/dev/", 5) == 0)
devfs_name += 5;
sprintf(path, "/dev/%s", devfs_name);
if (sys_access(path, 0) == 0)
return sys_symlink(devfs_name, name);
}
if (!dev)
return -1;
strcpy(path, "/dev");
if (find_in_devfs(path, dev) < 0)
return -1;
return sys_symlink(path + 5, name);
}
#if defined(CONFIG_BLK_DEV_RAM) || defined(CONFIG_BLK_DEV_FD)
static void __init change_floppy(char *fmt, ...)
void __init change_floppy(char *fmt, ...)
{
struct termios termios;
char buf[80];
......@@ -478,838 +316,69 @@ static void __init change_floppy(char *fmt, ...)
}
#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;
unsigned long rd_blocks, devblocks;
int nblocks, i, disk;
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/%ld blocks)\n",
nblocks, rd_blocks);
goto done;
}
/*
* OK, time to copy in the data
*/
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;
}
buf = kmalloc(BLOCK_SIZE, GFP_KERNEL);
if (buf == 0) {
printk(KERN_ERR "RAMDISK: could not allocate buffer\n");
goto done;
}
printk(KERN_NOTICE "RAMDISK: Loading %d blocks [%ld disk%s] into ram disk... ",
nblocks, ((nblocks-1)/devblocks)+1, nblocks>devblocks ? "s" : "");
for (i = 0, disk = 1; i < nblocks; i++) {
if (i && (i % devblocks == 0)) {
printk("done disk #%d.\n", disk++);
rotate = 0;
if (close(in_fd)) {
printk("Error closing the disk.\n");
goto noclose_input;
}
change_floppy("disk #%d", disk);
in_fd = open(from, O_RDONLY, 0);
if (in_fd < 0) {
printk("Error opening disk.\n");
goto noclose_input;
}
printk("Loading disk #%d... ", disk);
}
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");
}
static void __init mount_root(void)
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");
if (mount_nfs_root())
return;
}
printk(KERN_ERR "VFS: Unable to mount root fs via NFS, trying floppy.\n");
ROOT_DEV = Root_FD0;
}
#endif
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 = Root_RAM1;
create_dev("/dev/root", ROOT_DEV, NULL);
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);
}
#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 error;
int i, pid;
create_dev("/dev/root.old", Root_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 != waitpid(-1, &i, 0))
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(".");
close(old_fd);
close(root_fd);
sys_umount("/old/dev", 0);
if (real_root_dev == Root_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");
}
static void __init md_run_setup(void);
/*
* Prepare the namespace - decide what/where to mount, load ramdisks, etc.
*/
void prepare_namespace(void)
void __init prepare_namespace(void)
{
int is_floppy;
#ifdef CONFIG_DEVFS_FS
sys_mount("devfs", "/dev", "devfs", 0, NULL);
do_devfs = 1;
#endif
mount_devfs();
md_run_setup();
if (saved_root_name[0]) {
char *p = saved_root_name;
ROOT_DEV = name_to_dev_t(p);
if (strncmp(p, "/dev/", 5) == 0)
p += 5;
strcpy(root_device_name, p);
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;
#ifdef CONFIG_BLK_DEV_INITRD
if (!initrd_start)
mount_initrd = 0;
real_root_dev = ROOT_DEV;
#endif
create_dev("/dev/root", ROOT_DEV, NULL);
/* This has to be before mounting root, because even readonly mount of reiserfs would replay
log corrupting stuff */
software_resume();
if (mount_initrd) {
if (initrd_load() && ROOT_DEV != Root_RAM0) {
handle_initrd();
goto out;
}
} else if (is_floppy && rd_doload && rd_load_disk(0))
if (initrd_load())
goto out;
if (is_floppy && rd_doload && rd_load_disk(0))
ROOT_DEV = Root_RAM0;
mount_root();
out:
sys_umount("/dev", 0);
umount_devfs("/dev");
sys_mount(".", "/", NULL, MS_MOVE, NULL);
sys_chroot(".");
security_sb_post_mountroot();
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 int unzip_error;
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.
* Returning -1 does not guarantee that gunzip() will ever return.
*/
static int __init fill_inbuf(void)
{
if (exit_code) return -1;
insize = read(crd_infd, inbuf, INBUFSIZ);
if (insize == 0) {
error("RAMDISK: ran out of compressed data\n");
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, written;
uch *in, ch;
written = write(crd_outfd, window, outcnt);
if (written != outcnt && unzip_error == 0) {
printk(KERN_ERR "RAMDISK: incomplete write (%d != %d) %ld\n",
written, outcnt, bytes_out);
unzip_error = 1;
}
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;
unzip_error = 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();
if (unzip_error)
result = 1;
kfree(inbuf);
kfree(window);
return result;
}
#endif /* BUILD_CRAMDISK && CONFIG_BLK_DEV_RAM */
#ifdef CONFIG_BLK_DEV_MD
/*
* When md (and any require personalities) are compiled into the kernel
* (not a module), arrays can be assembles are boot time using with AUTODETECT
* where specially marked partitions are registered with md_autodetect_dev(),
* and with MD_BOOT where devices to be collected are given on the boot line
* with md=.....
* The code for that is here.
*/
struct {
int set;
int noautodetect;
} raid_setup_args __initdata;
static struct {
char device_set [MAX_MD_DEVS];
int pers[MAX_MD_DEVS];
int chunk[MAX_MD_DEVS];
char *device_names[MAX_MD_DEVS];
} md_setup_args __initdata;
/*
* Parse the command-line parameters given our kernel, but do not
* actually try to invoke the MD device now; that is handled by
* md_setup_drive after the low-level disk drivers have initialised.
*
* 27/11/1999: Fixed to work correctly with the 2.3 kernel (which
* assigns the task of parsing integer arguments to the
* invoked program now). Added ability to initialise all
* the MD devices (by specifying multiple "md=" lines)
* instead of just one. -- KTK
* 18May2000: Added support for persistent-superblock arrays:
* md=n,0,factor,fault,device-list uses RAID0 for device n
* md=n,-1,factor,fault,device-list uses LINEAR for device n
* md=n,device-list reads a RAID superblock from the devices
* elements in device-list are read by name_to_kdev_t so can be
* a hex number or something like /dev/hda1 /dev/sdb
* 2001-06-03: Dave Cinege <dcinege@psychosis.com>
* Shifted name_to_kdev_t() and related operations to md_set_drive()
* for later execution. Rewrote section to make devfs compatible.
*/
static int __init md_setup(char *str)
{
int minor, level, factor, fault, pers;
char *pername = "";
char *str1 = str;
if (get_option(&str, &minor) != 2) { /* MD Number */
printk(KERN_WARNING "md: Too few arguments supplied to md=.\n");
return 0;
}
if (minor >= MAX_MD_DEVS) {
printk(KERN_WARNING "md: md=%d, Minor device number too high.\n", minor);
return 0;
} else if (md_setup_args.device_names[minor]) {
printk(KERN_WARNING "md: md=%d, Specified more than once. "
"Replacing previous definition.\n", minor);
}
switch (get_option(&str, &level)) { /* RAID Personality */
case 2: /* could be 0 or -1.. */
if (level == 0 || level == LEVEL_LINEAR) {
if (get_option(&str, &factor) != 2 || /* Chunk Size */
get_option(&str, &fault) != 2) {
printk(KERN_WARNING "md: Too few arguments supplied to md=.\n");
return 0;
}
md_setup_args.pers[minor] = level;
md_setup_args.chunk[minor] = 1 << (factor+12);
switch(level) {
case LEVEL_LINEAR:
pers = LINEAR;
pername = "linear";
break;
case 0:
pers = RAID0;
pername = "raid0";
break;
default:
printk(KERN_WARNING
"md: The kernel has not been configured for raid%d support!\n",
level);
return 0;
}
md_setup_args.pers[minor] = pers;
break;
}
/* FALL THROUGH */
case 1: /* the first device is numeric */
str = str1;
/* FALL THROUGH */
case 0:
md_setup_args.pers[minor] = 0;
pername="super-block";
}
printk(KERN_INFO "md: Will configure md%d (%s) from %s, below.\n",
minor, pername, str);
md_setup_args.device_names[minor] = str;
return 1;
}
static void __init md_setup_drive(void)
{
int minor, i;
dev_t dev;
dev_t devices[MD_SB_DISKS+1];
for (minor = 0; minor < MAX_MD_DEVS; minor++) {
int fd;
int err = 0;
char *devname;
mdu_disk_info_t dinfo;
char name[16], devfs_name[16];
if (!(devname = md_setup_args.device_names[minor]))
continue;
sprintf(name, "/dev/md%d", minor);
sprintf(devfs_name, "/dev/md/%d", minor);
create_dev(name, MKDEV(MD_MAJOR, minor), devfs_name);
for (i = 0; i < MD_SB_DISKS && devname != 0; i++) {
char *p;
char comp_name[64];
struct stat buf;
p = strchr(devname, ',');
if (p)
*p++ = 0;
dev = name_to_dev_t(devname);
if (strncmp(devname, "/dev/", 5))
devname += 5;
snprintf(comp_name, 63, "/dev/%s", devname);
if (sys_newstat(comp_name, &buf) == 0 &&
S_ISBLK(buf.st_mode))
dev = buf.st_rdev;
if (!dev) {
printk(KERN_WARNING "md: Unknown device name: %s\n", devname);
break;
}
devices[i] = dev;
md_setup_args.device_set[minor] = 1;
devname = p;
}
devices[i] = 0;
if (!md_setup_args.device_set[minor])
continue;
printk(KERN_INFO "md: Loading md%d: %s\n", minor, md_setup_args.device_names[minor]);
fd = open(name, 0, 0);
if (fd < 0) {
printk(KERN_ERR "md: open failed - cannot start array %d\n", minor);
continue;
}
if (sys_ioctl(fd, SET_ARRAY_INFO, 0) == -EBUSY) {
printk(KERN_WARNING
"md: Ignoring md=%d, already autodetected. (Use raid=noautodetect)\n",
minor);
close(fd);
continue;
}
if (md_setup_args.pers[minor]) {
/* non-persistent */
mdu_array_info_t ainfo;
ainfo.level = pers_to_level(md_setup_args.pers[minor]);
ainfo.size = 0;
ainfo.nr_disks =0;
ainfo.raid_disks =0;
while (devices[ainfo.raid_disks])
ainfo.raid_disks++;
ainfo.md_minor =minor;
ainfo.not_persistent = 1;
ainfo.state = (1 << MD_SB_CLEAN);
ainfo.layout = 0;
ainfo.chunk_size = md_setup_args.chunk[minor];
err = sys_ioctl(fd, SET_ARRAY_INFO, (long)&ainfo);
for (i = 0; !err && i <= MD_SB_DISKS; i++) {
dev = devices[i];
if (!dev)
break;
dinfo.number = i;
dinfo.raid_disk = i;
dinfo.state = (1<<MD_DISK_ACTIVE)|(1<<MD_DISK_SYNC);
dinfo.major = MAJOR(dev);
dinfo.minor = MINOR(dev);
err = sys_ioctl(fd, ADD_NEW_DISK, (long)&dinfo);
}
} else {
/* persistent */
for (i = 0; i <= MD_SB_DISKS; i++) {
dev = devices[i];
if (!dev)
break;
dinfo.major = MAJOR(dev);
dinfo.minor = MINOR(dev);
sys_ioctl(fd, ADD_NEW_DISK, (long)&dinfo);
}
}
if (!err)
err = sys_ioctl(fd, RUN_ARRAY, 0);
if (err)
printk(KERN_WARNING "md: starting md%d failed\n", minor);
close(fd);
}
}
static int __init raid_setup(char *str)
{
int len, pos;
len = strlen(str) + 1;
pos = 0;
while (pos < len) {
char *comma = strchr(str+pos, ',');
int wlen;
if (comma)
wlen = (comma-str)-pos;
else wlen = (len-1)-pos;
if (!strncmp(str, "noautodetect", wlen))
raid_setup_args.noautodetect = 1;
pos += wlen+1;
}
raid_setup_args.set = 1;
return 1;
}
__setup("raid=", raid_setup);
__setup("md=", md_setup);
#endif
static void __init md_run_setup(void)
{
#ifdef CONFIG_BLK_DEV_MD
create_dev("/dev/md0", MKDEV(MD_MAJOR, 0), "md/0");
if (raid_setup_args.noautodetect)
printk(KERN_INFO "md: Skipping autodetection of RAID arrays. (raid=noautodetect)\n");
else {
int fd = open("/dev/md0", 0, 0);
if (fd >= 0) {
sys_ioctl(fd, RAID_AUTORUN, 0);
close(fd);
}
}
md_setup_drive();
#endif
}
init/do_mounts.h 0 → 100644
View file @ c5e3ab0e
#define __KERNEL_SYSCALLS__
#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/devfs_fs_kernel.h>
#include <linux/init.h>
#include <linux/unistd.h>
#include <linux/slab.h>
#include <linux/mount.h>
#include <linux/blk.h>
#include <linux/root_dev.h>
asmlinkage long sys_unlink(const char *name);
asmlinkage long sys_mknod(const char *name, int mode, dev_t dev);
asmlinkage long sys_newstat(char * filename, struct stat * statbuf);
asmlinkage long sys_ioctl(int fd, int cmd, unsigned long arg);
asmlinkage long sys_mkdir(const char *name, int mode);
asmlinkage long sys_rmdir(const char *name);
asmlinkage long sys_chdir(const char *name);
asmlinkage long sys_fchdir(int fd);
asmlinkage long sys_chroot(const char *name);
asmlinkage long sys_mount(char *dev_name, char *dir_name, char *type,
unsigned long flags, void *data);
asmlinkage long sys_umount(char *name, int flags);
dev_t name_to_dev_t(char *name);
void change_floppy(char *fmt, ...);
void mount_block_root(char *name, int flags);
void mount_root(void);
extern int root_mountflags;
#ifdef CONFIG_DEVFS_FS
void mount_devfs(void);
void umount_devfs(char *path);
int create_dev(char *name, dev_t dev, char *devfs_name);
#else
static inline void mount_devfs(void) {}
static inline void umount_devfs(const char *path) {}
static inline int create_dev(char *name, dev_t dev, char *devfs_name)
{
sys_unlink(name);
return sys_mknod(name, S_IFBLK|0600, dev);
}
#endif
#ifdef CONFIG_BLK_DEV_RAM
int __init rd_load_disk(int n);
int __init rd_load_image(char *from);
#else
static inline int rd_load_disk(int n) { return 0; }
static inline int rd_load_image(char *from) { return 0; }
#endif
#ifdef CONFIG_BLK_DEV_INITRD
int __init initrd_load(void);
#else
static inline int initrd_load(void) { return 0; }
#endif
#ifdef CONFIG_BLK_DEV_MD
void md_run_setup(void);
#else
static inline void md_run_setup(void) {}
#endif
init/do_mounts_devfs.c 0 → 100644
View file @ c5e3ab0e
#include <linux/kernel.h>
#include <linux/dirent.h>
#include <linux/string.h>
#include "do_mounts.h"
extern asmlinkage long sys_symlink(const char *old, const char *new);
extern asmlinkage long sys_access(const char * filename, int mode);
extern asmlinkage long sys_getdents64(unsigned int fd, void * dirent,
unsigned int count);
void __init mount_devfs(void)
{
sys_mount("devfs", "/dev", "devfs", 0, NULL);
}
void __init umount_devfs(char *path)
{
sys_umount(path, 0);
}
/*
* If the dir will fit in *buf, return its length. If it won't fit, return
* zero. Return -ve on error.
*/
static int __init do_read_dir(int fd, void *buf, int len)
{
long bytes, n;
char *p = buf;
lseek(fd, 0, 0);
for (bytes = 0; bytes < len; bytes += n) {
n = sys_getdents64(fd, p + bytes, len - bytes);
if (n < 0)
return n;
if (n == 0)
return bytes;
}
return 0;
}
/*
* Try to read all of a directory. Returns the contents at *p, which
* is kmalloced memory. Returns the number of bytes read at *len. Returns
* NULL on error.
*/
static void * __init read_dir(char *path, int *len)
{
int size;
int fd = open(path, 0, 0);
*len = 0;
if (fd < 0)
return NULL;
for (size = 1 << 9; size <= (1 << MAX_ORDER); size <<= 1) {
void *p = kmalloc(size, GFP_KERNEL);
int n;
if (!p)
break;
n = do_read_dir(fd, p, size);
if (n > 0) {
close(fd);
*len = n;
return p;
}
kfree(p);
if (n == -EINVAL)
continue; /* Try a larger buffer */
if (n < 0)
break;
}
close(fd);
return NULL;
}
/*
* recursively scan <path>, looking for a device node of type <dev>
*/
static int __init find_in_devfs(char *path, dev_t dev)
{
struct stat buf;
char *end = path + strlen(path);
int rest = path + 64 - end;
int size;
char *p = read_dir(path, &size);
char *s;
if (!p)
return -1;
for (s = p; s < p + size; s += ((struct linux_dirent64 *)s)->d_reclen) {
struct linux_dirent64 *d = (struct linux_dirent64 *)s;
if (strlen(d->d_name) + 2 > rest)
continue;
switch (d->d_type) {
case DT_BLK:
sprintf(end, "/%s", d->d_name);
if (sys_newstat(path, &buf) < 0)
break;
if (!S_ISBLK(buf.st_mode))
break;
if (buf.st_rdev != dev)
break;
kfree(p);
return 0;
case DT_DIR:
if (strcmp(d->d_name, ".") == 0)
break;
if (strcmp(d->d_name, "..") == 0)
break;
sprintf(end, "/%s", d->d_name);
if (find_in_devfs(path, dev) < 0)
break;
kfree(p);
return 0;
}
}
kfree(p);
return -1;
}
/*
* create a device node called <name> which points to
* <devfs_name> if possible, otherwise find a device node
* which matches <dev> and make <name> a symlink pointing to it.
*/
int __init create_dev(char *name, dev_t dev, char *devfs_name)
{
char path[64];
sys_unlink(name);
if (devfs_name && devfs_name[0]) {
if (strncmp(devfs_name, "/dev/", 5) == 0)
devfs_name += 5;
sprintf(path, "/dev/%s", devfs_name);
if (sys_access(path, 0) == 0)
return sys_symlink(devfs_name, name);
}
if (!dev)
return -1;
strcpy(path, "/dev");
if (find_in_devfs(path, dev) < 0)
return -1;
return sys_symlink(path + 5, name);
}
init/do_mounts_md.c 0 → 100644
View file @ c5e3ab0e
#include <linux/raid/md.h>
#include "do_mounts.h"
/*
* When md (and any require personalities) are compiled into the kernel
* (not a module), arrays can be assembles are boot time using with AUTODETECT
* where specially marked partitions are registered with md_autodetect_dev(),
* and with MD_BOOT where devices to be collected are given on the boot line
* with md=.....
* The code for that is here.
*/
static int __initdata raid_noautodetect;
static struct {
char device_set [MAX_MD_DEVS];
int pers[MAX_MD_DEVS];
int chunk[MAX_MD_DEVS];
char *device_names[MAX_MD_DEVS];
} md_setup_args __initdata;
/*
* Parse the command-line parameters given our kernel, but do not
* actually try to invoke the MD device now; that is handled by
* md_setup_drive after the low-level disk drivers have initialised.
*
* 27/11/1999: Fixed to work correctly with the 2.3 kernel (which
* assigns the task of parsing integer arguments to the
* invoked program now). Added ability to initialise all
* the MD devices (by specifying multiple "md=" lines)
* instead of just one. -- KTK
* 18May2000: Added support for persistent-superblock arrays:
* md=n,0,factor,fault,device-list uses RAID0 for device n
* md=n,-1,factor,fault,device-list uses LINEAR for device n
* md=n,device-list reads a RAID superblock from the devices
* elements in device-list are read by name_to_kdev_t so can be
* a hex number or something like /dev/hda1 /dev/sdb
* 2001-06-03: Dave Cinege <dcinege@psychosis.com>
* Shifted name_to_kdev_t() and related operations to md_set_drive()
* for later execution. Rewrote section to make devfs compatible.
*/
static int __init md_setup(char *str)
{
int minor, level, factor, fault, pers;
char *pername = "";
char *str1 = str;
if (get_option(&str, &minor) != 2) { /* MD Number */
printk(KERN_WARNING "md: Too few arguments supplied to md=.\n");
return 0;
}
if (minor >= MAX_MD_DEVS) {
printk(KERN_WARNING "md: md=%d, Minor device number too high.\n", minor);
return 0;
} else if (md_setup_args.device_names[minor]) {
printk(KERN_WARNING "md: md=%d, Specified more than once. "
"Replacing previous definition.\n", minor);
}
switch (get_option(&str, &level)) { /* RAID Personality */
case 2: /* could be 0 or -1.. */
if (level == 0 || level == LEVEL_LINEAR) {
if (get_option(&str, &factor) != 2 || /* Chunk Size */
get_option(&str, &fault) != 2) {
printk(KERN_WARNING "md: Too few arguments supplied to md=.\n");
return 0;
}
md_setup_args.pers[minor] = level;
md_setup_args.chunk[minor] = 1 << (factor+12);
switch(level) {
case LEVEL_LINEAR:
pers = LINEAR;
pername = "linear";
break;
case 0:
pers = RAID0;
pername = "raid0";
break;
default:
printk(KERN_WARNING
"md: The kernel has not been configured for raid%d support!\n",
level);
return 0;
}
md_setup_args.pers[minor] = pers;
break;
}
/* FALL THROUGH */
case 1: /* the first device is numeric */
str = str1;
/* FALL THROUGH */
case 0:
md_setup_args.pers[minor] = 0;
pername="super-block";
}
printk(KERN_INFO "md: Will configure md%d (%s) from %s, below.\n",
minor, pername, str);
md_setup_args.device_names[minor] = str;
return 1;
}
static void __init md_setup_drive(void)
{
int minor, i;
dev_t dev;
dev_t devices[MD_SB_DISKS+1];
for (minor = 0; minor < MAX_MD_DEVS; minor++) {
int fd;
int err = 0;
char *devname;
mdu_disk_info_t dinfo;
char name[16], devfs_name[16];
if (!(devname = md_setup_args.device_names[minor]))
continue;
sprintf(name, "/dev/md%d", minor);
sprintf(devfs_name, "/dev/md/%d", minor);
create_dev(name, MKDEV(MD_MAJOR, minor), devfs_name);
for (i = 0; i < MD_SB_DISKS && devname != 0; i++) {
char *p;
char comp_name[64];
struct stat buf;
p = strchr(devname, ',');
if (p)
*p++ = 0;
dev = name_to_dev_t(devname);
if (strncmp(devname, "/dev/", 5) == 0)
devname += 5;
snprintf(comp_name, 63, "/dev/%s", devname);
if (sys_newstat(comp_name, &buf) == 0 &&
S_ISBLK(buf.st_mode))
dev = buf.st_rdev;
if (!dev) {
printk(KERN_WARNING "md: Unknown device name: %s\n", devname);
break;
}
devices[i] = dev;
md_setup_args.device_set[minor] = 1;
devname = p;
}
devices[i] = 0;
if (!md_setup_args.device_set[minor])
continue;
printk(KERN_INFO "md: Loading md%d: %s\n", minor, md_setup_args.device_names[minor]);
fd = open(name, 0, 0);
if (fd < 0) {
printk(KERN_ERR "md: open failed - cannot start array %d\n", minor);
continue;
}
if (sys_ioctl(fd, SET_ARRAY_INFO, 0) == -EBUSY) {
printk(KERN_WARNING
"md: Ignoring md=%d, already autodetected. (Use raid=noautodetect)\n",
minor);
close(fd);
continue;
}
if (md_setup_args.pers[minor]) {
/* non-persistent */
mdu_array_info_t ainfo;
ainfo.level = pers_to_level(md_setup_args.pers[minor]);
ainfo.size = 0;
ainfo.nr_disks =0;
ainfo.raid_disks =0;
while (devices[ainfo.raid_disks])
ainfo.raid_disks++;
ainfo.md_minor =minor;
ainfo.not_persistent = 1;
ainfo.state = (1 << MD_SB_CLEAN);
ainfo.layout = 0;
ainfo.chunk_size = md_setup_args.chunk[minor];
err = sys_ioctl(fd, SET_ARRAY_INFO, (long)&ainfo);
for (i = 0; !err && i <= MD_SB_DISKS; i++) {
dev = devices[i];
if (!dev)
break;
dinfo.number = i;
dinfo.raid_disk = i;
dinfo.state = (1<<MD_DISK_ACTIVE)|(1<<MD_DISK_SYNC);
dinfo.major = MAJOR(dev);
dinfo.minor = MINOR(dev);
err = sys_ioctl(fd, ADD_NEW_DISK, (long)&dinfo);
}
} else {
/* persistent */
for (i = 0; i <= MD_SB_DISKS; i++) {
dev = devices[i];
if (!dev)
break;
dinfo.major = MAJOR(dev);
dinfo.minor = MINOR(dev);
sys_ioctl(fd, ADD_NEW_DISK, (long)&dinfo);
}
}
if (!err)
err = sys_ioctl(fd, RUN_ARRAY, 0);
if (err)
printk(KERN_WARNING "md: starting md%d failed\n", minor);
close(fd);
}
}
static int __init raid_setup(char *str)
{
int len, pos;
len = strlen(str) + 1;
pos = 0;
while (pos < len) {
char *comma = strchr(str+pos, ',');
int wlen;
if (comma)
wlen = (comma-str)-pos;
else wlen = (len-1)-pos;
if (!strncmp(str, "noautodetect", wlen))
raid_noautodetect = 1;
pos += wlen+1;
}
return 1;
}
__setup("raid=", raid_setup);
__setup("md=", md_setup);
void __init md_run_setup(void)
{
create_dev("/dev/md0", MKDEV(MD_MAJOR, 0), "md/0");
if (raid_noautodetect)
printk(KERN_INFO "md: Skipping autodetection of RAID arrays. (raid=noautodetect)\n");
else {
int fd = open("/dev/md0", 0, 0);
if (fd >= 0) {
sys_ioctl(fd, RAID_AUTORUN, 0);
close(fd);
}
}
md_setup_drive();
}
init/do_mounts_rd.c 0 → 100644
View file @ c5e3ab0e
#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/minix_fs.h>
#include <linux/ext2_fs.h>
#include <linux/romfs_fs.h>
#include "do_mounts.h"
#define BUILD_CRAMDISK
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;
}
int __init rd_load_image(char *from)
{
int res = 0;
int in_fd, out_fd;
unsigned long rd_blocks, devblocks;
int nblocks, i, disk;
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/%ld blocks)\n",
nblocks, rd_blocks);
goto done;
}
/*
* OK, time to copy in the data
*/
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;
}
buf = kmalloc(BLOCK_SIZE, GFP_KERNEL);
if (buf == 0) {
printk(KERN_ERR "RAMDISK: could not allocate buffer\n");
goto done;
}
printk(KERN_NOTICE "RAMDISK: Loading %d blocks [%ld disk%s] into ram disk... ",
nblocks, ((nblocks-1)/devblocks)+1, nblocks>devblocks ? "s" : "");
for (i = 0, disk = 1; i < nblocks; i++) {
if (i && (i % devblocks == 0)) {
printk("done disk #%d.\n", disk++);
rotate = 0;
if (close(in_fd)) {
printk("Error closing the disk.\n");
goto noclose_input;
}
change_floppy("disk #%d", disk);
in_fd = open(from, O_RDONLY, 0);
if (in_fd < 0) {
printk("Error opening disk.\n");
goto noclose_input;
}
printk("Loading disk #%d... ", disk);
}
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");
return res;
}
int __init rd_load_disk(int n)
{
if (rd_prompt)
change_floppy("root floppy disk to be loaded into RAM disk");
create_dev("/dev/ram", MKDEV(RAMDISK_MAJOR, n), NULL);
return rd_load_image("/dev/root");
}
#ifdef CONFIG_BLK_DEV_INITRD
unsigned int real_root_dev; /* do_proc_dointvec cannot handle kdev_t */
static int __initdata old_fd, root_fd;
static int __initdata mount_initrd = 1;
static int __init no_initrd(char *str)
{
mount_initrd = 0;
return 1;
}
__setup("noinitrd", no_initrd);
static int __init 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);
}
static void __init handle_initrd(void)
{
int error;
int i, pid;
real_root_dev = ROOT_DEV;
create_dev("/dev/root.old", Root_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 != waitpid(-1, &i, 0))
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(".");
close(old_fd);
close(root_fd);
umount_devfs("/old/dev");
if (real_root_dev == Root_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");
}
}
int __init initrd_load(void)
{
if (!mount_initrd)
return 0;
create_dev("/dev/ram", MKDEV(RAMDISK_MAJOR, 0), NULL);
create_dev("/dev/initrd", MKDEV(RAMDISK_MAJOR, INITRD_MINOR), NULL);
/* Load the initrd data into /dev/ram0. Execute it as initrd unless
* /dev/ram0 is supposed to be our actual root device, in
* that case the ram disk is just set up here, and gets
* mounted in the normal path. */
if (rd_load_image("/dev/initrd") && ROOT_DEV != Root_RAM0) {
handle_initrd();
return 1;
}
return 0;
}
#endif
#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 int unzip_error;
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.
* Returning -1 does not guarantee that gunzip() will ever return.
*/
static int __init fill_inbuf(void)
{
if (exit_code) return -1;
insize = read(crd_infd, inbuf, INBUFSIZ);
if (insize == 0) {
error("RAMDISK: ran out of compressed data\n");
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, written;
uch *in, ch;
written = write(crd_outfd, window, outcnt);
if (written != outcnt && unzip_error == 0) {
printk(KERN_ERR "RAMDISK: incomplete write (%d != %d) %ld\n",
written, outcnt, bytes_out);
unzip_error = 1;
}
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;
unzip_error = 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();
if (unzip_error)
result = 1;
kfree(inbuf);
kfree(window);
return result;
}
#endif /* BUILD_CRAMDISK */
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