Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 430 insertions, 0 deletions

diff --git a/init/do_mounts.c b/init/do_mounts.c
new file mode 100644
index 000000000000..b7570c074d0f
--- /dev/null
+++ b/init/do_mounts.c
@@ -0,0 +1,430 @@
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/ctype.h>
+#include <linux/fd.h>
+#include <linux/tty.h>
+#include <linux/suspend.h>
+#include <linux/root_dev.h>
+#include <linux/security.h>
+#include <linux/delay.h>
+
+#include <linux/nfs_fs.h>
+#include <linux/nfs_fs_sb.h>
+#include <linux/nfs_mount.h>
+
+#include "do_mounts.h"
+
+extern int get_filesystem_list(char * buf);
+
+int __initdata rd_doload;       /* 1 = load RAM disk, 0 = don't load */
+
+int root_mountflags = MS_RDONLY | MS_VERBOSE;
+char * __initdata root_device_name;
+static char __initdata saved_root_name[64];
+
+/* this is initialized in init/main.c */
+dev_t ROOT_DEV;
+
+EXPORT_SYMBOL(ROOT_DEV);
+
+static int __init load_ramdisk(char *str)
+{
+        rd_doload = simple_strtol(str,NULL,0) & 3;
+        return 1;
+}
+__setup("load_ramdisk=", load_ramdisk);
+
+static int __init readonly(char *str)
+{
+        if (*str)
+                return 0;
+        root_mountflags |= MS_RDONLY;
+        return 1;
+}
+
+static int __init readwrite(char *str)
+{
+        if (*str)
+                return 0;
+        root_mountflags &= ~MS_RDONLY;
+        return 1;
+}
+
+__setup("ro", readonly);
+__setup("rw", readwrite);
+
+static dev_t try_name(char *name, int part)
+{
+        char path[64];
+        char buf[32];
+        int range;
+        dev_t res;
+        char *s;
+        int len;
+        int fd;
+        unsigned int maj, min;
+
+        /* read device number from .../dev */
+
+        sprintf(path, "/sys/block/%s/dev", name);
+        fd = sys_open(path, 0, 0);
+        if (fd < 0)
+                goto fail;
+        len = sys_read(fd, buf, 32);
+        sys_close(fd);
+        if (len <= 0 || len == 32 || buf[len - 1] != '\n')
+                goto fail;
+        buf[len - 1] = '\0';
+        if (sscanf(buf, "%u:%u", &maj, &min) == 2) {
+                /*
+                 * Try the %u:%u format -- see print_dev_t()
+                 */
+                res = MKDEV(maj, min);
+                if (maj != MAJOR(res) || min != MINOR(res))
+                        goto fail;
+        } else {
+                /*
+                 * Nope.  Try old-style "0321"
+                 */
+                res = new_decode_dev(simple_strtoul(buf, &s, 16));
+                if (*s)
+                        goto fail;
+        }
+
+        /* if it's there and we are not looking for a partition - that's it */
+        if (!part)
+                return res;
+
+        /* otherwise read range from .../range */
+        sprintf(path, "/sys/block/%s/range", name);
+        fd = sys_open(path, 0, 0);
+        if (fd < 0)
+                goto fail;
+        len = sys_read(fd, buf, 32);
+        sys_close(fd);
+        if (len <= 0 || len == 32 || buf[len - 1] != '\n')
+                goto fail;
+        buf[len - 1] = '\0';
+        range = simple_strtoul(buf, &s, 10);
+        if (*s)
+                goto fail;
+
+        /* if partition is within range - we got it */
+        if (part < range)
+                return res + part;
+fail:
+        return 0;
+}
+
+/*
+ *      Convert a name into device number.  We accept the following variants:
+ *
+ *      1) device number in hexadecimal represents itself
+ *      2) /dev/nfs represents Root_NFS (0xff)
+ *      3) /dev/<disk_name> represents the device number of disk
+ *      4) /dev/<disk_name><decimal> represents the device number
+ *         of partition - device number of disk plus the partition number
+ *      5) /dev/<disk_name>p<decimal> - same as the above, that form is
+ *         used when disk name of partitioned disk ends on a digit.
+ *
+ *      If name doesn't have fall into the categories above, we return 0.
+ *      Driverfs is used to check if something is a disk name - it has
+ *      all known disks under bus/block/devices.  If the disk name
+ *      contains slashes, name of driverfs node has them replaced with
+ *      bangs.  try_name() does the actual checks, assuming that driverfs
+ *      is mounted on rootfs /sys.
+ */
+
+dev_t name_to_dev_t(char *name)
+{
+        char s[32];
+        char *p;
+        dev_t res = 0;
+        int part;
+
+#ifdef CONFIG_SYSFS
+        int mkdir_err = sys_mkdir("/sys", 0700);
+        if (sys_mount("sysfs", "/sys", "sysfs", 0, NULL) < 0)
+                goto out;
+#endif
+
+        if (strncmp(name, "/dev/", 5) != 0) {
+                unsigned maj, min;
+
+                if (sscanf(name, "%u:%u", &maj, &min) == 2) {
+                        res = MKDEV(maj, min);
+                        if (maj != MAJOR(res) || min != MINOR(res))
+                                goto fail;
+                } else {
+                        res = new_decode_dev(simple_strtoul(name, &p, 16));
+                        if (*p)
+                                goto fail;
+                }
+                goto done;
+        }
+        name += 5;
+        res = Root_NFS;
+        if (strcmp(name, "nfs") == 0)
+                goto done;
+        res = Root_RAM0;
+        if (strcmp(name, "ram") == 0)
+                goto done;
+
+        if (strlen(name) > 31)
+                goto fail;
+        strcpy(s, name);
+        for (p = s; *p; p++)
+                if (*p == '/')
+                        *p = '!';
+        res = try_name(s, 0);
+        if (res)
+                goto done;
+
+        while (p > s && isdigit(p[-1]))
+                p--;
+        if (p == s || !*p || *p == '0')
+                goto fail;
+        part = simple_strtoul(p, NULL, 10);
+        *p = '\0';
+        res = try_name(s, part);
+        if (res)
+                goto done;
+
+        if (p < s + 2 || !isdigit(p[-2]) || p[-1] != 'p')
+                goto fail;
+        p[-1] = '\0';
+        res = try_name(s, part);
+done:
+#ifdef CONFIG_SYSFS
+        sys_umount("/sys", 0);
+out:
+        if (!mkdir_err)
+                sys_rmdir("/sys");
+#endif
+        return res;
+fail:
+        res = 0;
+        goto done;
+}
+
+static int __init root_dev_setup(char *line)
+{
+        strlcpy(saved_root_name, line, sizeof(saved_root_name));
+        return 1;
+}
+
+__setup("root=", root_dev_setup);
+
+static char * __initdata root_mount_data;
+static int __init root_data_setup(char *str)
+{
+        root_mount_data = str;
+        return 1;
+}
+
+static char * __initdata root_fs_names;
+static int __init fs_names_setup(char *str)
+{
+        root_fs_names = str;
+        return 1;
+}
+
+static unsigned int __initdata root_delay;
+static int __init root_delay_setup(char *str)
+{
+        root_delay = simple_strtoul(str, NULL, 0);
+        return 1;
+}
+
+__setup("rootflags=", root_data_setup);
+__setup("rootfstype=", fs_names_setup);
+__setup("rootdelay=", root_delay_setup);
+
+static void __init get_fs_names(char *page)
+{
+        char *s = page;
+
+        if (root_fs_names) {
+                strcpy(page, root_fs_names);
+                while (*s++) {
+                        if (s[-1] == ',')
+                                s[-1] = '\0';
+                }
+        } else {
+                int len = get_filesystem_list(page);
+                char *p, *next;
+
+                page[len] = '\0';
+                for (p = page-1; p; p = next) {
+                        next = strchr(++p, '\n');
+                        if (*p++ != '\t')
+                                continue;
+                        while ((*s++ = *p++) != '\n')
+                                ;
+                        s[-1] = '\0';
+                }
+        }
+        *s = '\0';
+}
+
+static int __init do_mount_root(char *name, char *fs, int flags, void *data)
+{
+        int err = sys_mount(name, "/root", fs, flags, data);
+        if (err)
+                return err;
+
+        sys_chdir("/root");
+        ROOT_DEV = current->fs->pwdmnt->mnt_sb->s_dev;
+        printk("VFS: Mounted root (%s filesystem)%s.\n",
+               current->fs->pwdmnt->mnt_sb->s_type->name,
+               current->fs->pwdmnt->mnt_sb->s_flags & MS_RDONLY ? 
+               " readonly" : "");
+        return 0;
+}
+
+void __init mount_block_root(char *name, int flags)
+{
+        char *fs_names = __getname();
+        char *p;
+        char b[BDEVNAME_SIZE];
+
+        get_fs_names(fs_names);
+retry:
+        for (p = fs_names; *p; p += strlen(p)+1) {
+                int err = do_mount_root(name, p, flags, root_mount_data);
+                switch (err) {
+                        case 0:
+                                goto out;
+                        case -EACCES:
+                                flags |= MS_RDONLY;
+                                goto retry;
+                        case -EINVAL:
+                                continue;
+                }
+                /*
+                 * Allow the user to distinguish between failed sys_open
+                 * and bad superblock on root device.
+                 */
+                __bdevname(ROOT_DEV, b);
+                printk("VFS: Cannot open root device \"%s\" or %s\n",
+                                root_device_name, b);
+                printk("Please append a correct \"root=\" boot option\n");
+
+                panic("VFS: Unable to mount root fs on %s", b);
+        }
+        panic("VFS: Unable to mount root fs on %s", __bdevname(ROOT_DEV, b));
+out:
+        putname(fs_names);
+}
+ 
+#ifdef CONFIG_ROOT_NFS
+static int __init mount_nfs_root(void)
+{
+        void *data = nfs_root_data();
+
+        create_dev("/dev/root", ROOT_DEV, NULL);
+        if (data &&
+            do_mount_root("/dev/root", "nfs", root_mountflags, data) == 0)
+                return 1;
+        return 0;
+}
+#endif
+
+#if defined(CONFIG_BLK_DEV_RAM) || defined(CONFIG_BLK_DEV_FD)
+void __init change_floppy(char *fmt, ...)
+{
+        struct termios termios;
+        char buf[80];
+        char c;
+        int fd;
+        va_list args;
+        va_start(args, fmt);
+        vsprintf(buf, fmt, args);
+        va_end(args);
+        fd = sys_open("/dev/root", O_RDWR | O_NDELAY, 0);
+        if (fd >= 0) {
+                sys_ioctl(fd, FDEJECT, 0);
+                sys_close(fd);
+        }
+        printk(KERN_NOTICE "VFS: Insert %s and press ENTER\n", buf);
+        fd = sys_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);
+                sys_read(fd, &c, 1);
+                termios.c_lflag |= ICANON;
+                sys_ioctl(fd, TCSETSF, (long)&termios);
+                sys_close(fd);
+        }
+}
+#endif
+
+void __init mount_root(void)
+{
+#ifdef CONFIG_ROOT_NFS
+        if (MAJOR(ROOT_DEV) == UNNAMED_MAJOR) {
+                if (mount_nfs_root())
+                        return;
+
+                printk(KERN_ERR "VFS: Unable to mount root fs via NFS, trying floppy.\n");
+                ROOT_DEV = Root_FD0;
+        }
+#endif
+#ifdef CONFIG_BLK_DEV_FD
+        if (MAJOR(ROOT_DEV) == FLOPPY_MAJOR) {
+                /* rd_doload is 2 for a dual initrd/ramload setup */
+                if (rd_doload==2) {
+                        if (rd_load_disk(1)) {
+                                ROOT_DEV = Root_RAM1;
+                                root_device_name = NULL;
+                        }
+                } else
+                        change_floppy("root floppy");
+        }
+#endif
+        create_dev("/dev/root", ROOT_DEV, root_device_name);
+        mount_block_root("/dev/root", root_mountflags);
+}
+
+/*
+ * Prepare the namespace - decide what/where to mount, load ramdisks, etc.
+ */
+void __init prepare_namespace(void)
+{
+        int is_floppy;
+
+        mount_devfs();
+
+        if (root_delay) {
+                printk(KERN_INFO "Waiting %dsec before mounting root device...\n",
+                       root_delay);
+                ssleep(root_delay);
+        }
+
+        md_run_setup();
+
+        if (saved_root_name[0]) {
+                root_device_name = saved_root_name;
+                ROOT_DEV = name_to_dev_t(root_device_name);
+                if (strncmp(root_device_name, "/dev/", 5) == 0)
+                        root_device_name += 5;
+        }
+
+        is_floppy = MAJOR(ROOT_DEV) == FLOPPY_MAJOR;
+
+        if (initrd_load())
+                goto out;
+
+        if (is_floppy && rd_doload && rd_load_disk(0))
+                ROOT_DEV = Root_RAM0;
+
+        mount_root();
+out:
+        umount_devfs("/dev");
+        sys_mount(".", "/", NULL, MS_MOVE, NULL);
+        sys_chroot(".");
+        security_sb_post_mountroot();
+        mount_devfs_fs ();
+}
+