/* * unmount file systems */ int umount(const char * dir) { char buf[MAX_PATH]; int err; if((err = vfs_path_conv(dir, buf)) != 0) return err; return sys_umount(buf); }
/* * process UMOUNT command, umount the device to the target directory. */ static void rfs_umount(struct aipc_rfs_msg *msg) { struct aipc_rfs_open *param = (struct aipc_rfs_open*)msg->parameter; int ret; mm_segment_t oldfs = get_fs(); set_fs(KERNEL_DS); ret = sys_umount(param->name, MNT_DETACH); set_fs(oldfs); if(ret < 0) { DMSG("rfs_umount error: %d\n", ret); } msg->parameter[0] = ret; }
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 void __init handle_initrd(void) { int error; int pid; real_root_dev = new_encode_dev(ROOT_DEV); create_dev("/dev/root.old", Root_RAM0); /* mount initrd on rootfs' /root */ mount_block_root("/dev/root.old", root_mountflags & ~MS_RDONLY); sys_mkdir((const char __user *)"/old", 0700); root_fd = sys_open((const char __user *)"/", 0, 0); old_fd = sys_open((const char __user *)"/old", 0, 0); /* move initrd over / and chdir/chroot in initrd root */ sys_chdir((const char __user *)"/root"); sys_mount((char __user *)".", (char __user *)"/", NULL, MS_MOVE, NULL); sys_chroot((const char __user *)"."); /* * In case that a resume from disk is carried out by linuxrc or one of * its children, we need to tell the freezer not to wait for us. */ current->flags |= PF_FREEZER_SKIP; pid = kernel_thread(do_linuxrc, "/linuxrc", SIGCHLD); if (pid > 0) while (pid != sys_wait4(-1, NULL, 0, NULL)) yield(); current->flags &= ~PF_FREEZER_SKIP; /* move initrd to rootfs' /old */ sys_fchdir(old_fd); sys_mount((char __user *)"/", (char __user *)".", NULL, MS_MOVE, NULL); /* switch root and cwd back to / of rootfs */ sys_fchdir(root_fd); sys_chroot((const char __user *)"."); sys_close(old_fd); sys_close(root_fd); if (new_decode_dev(real_root_dev) == Root_RAM0) { sys_chdir((const char __user *)"/old"); return; } ROOT_DEV = new_decode_dev(real_root_dev); mount_root(); printk(KERN_NOTICE "Trying to move old root to /initrd ... "); error = sys_mount((char __user *)"/old", (char __user *)"/root/initrd", NULL, MS_MOVE, NULL); if (!error) printk("okay\n"); else { int fd = sys_open((const char __user *)"/dev/root.old", O_RDWR, 0); if (error == -ENOENT) printk("/initrd does not exist. Ignored.\n"); else printk("failed\n"); printk(KERN_NOTICE "Unmounting old root\n"); sys_umount((char __user *)"/old", MNT_DETACH); printk(KERN_NOTICE "Trying to free ramdisk memory ... "); if (fd < 0) { error = fd; } else { error = sys_ioctl(fd, BLKFLSBUF, 0); sys_close(fd); } printk(!error ? "okay\n" : "failed\n"); } }
static int syscall_dispatch(uint32_t sysnum, uint32_t args, regs_t *regs) { switch (sysnum) { case SYS_waitpid: return sys_waitpid((waitpid_args_t *)args); case SYS_exit: do_exit((int)args); panic("exit failed!\n"); return 0; case SYS_thr_exit: kthread_exit((void *)args); panic("thr_exit failed!\n"); return 0; case SYS_thr_yield: sched_make_runnable(curthr); sched_switch(); return 0; case SYS_fork: return sys_fork(regs); case SYS_getpid: return curproc->p_pid; case SYS_sync: sys_sync(); return 0; #ifdef __MOUNTING__ case SYS_mount: return sys_mount((mount_args_t *) args); case SYS_umount: return sys_umount((argstr_t *) args); #endif case SYS_mmap: return (int) sys_mmap((mmap_args_t *) args); case SYS_munmap: return sys_munmap((munmap_args_t *) args); case SYS_open: return sys_open((open_args_t *) args); case SYS_close: return sys_close((int)args); case SYS_read: return sys_read((read_args_t *)args); case SYS_write: return sys_write((write_args_t *)args); case SYS_dup: return sys_dup((int)args); case SYS_dup2: return sys_dup2((dup2_args_t *)args); case SYS_mkdir: return sys_mkdir((mkdir_args_t *)args); case SYS_rmdir: return sys_rmdir((argstr_t *)args); case SYS_unlink: return sys_unlink((argstr_t *)args); case SYS_link: return sys_link((link_args_t *)args); case SYS_rename: return sys_rename((rename_args_t *)args); case SYS_chdir: return sys_chdir((argstr_t *)args); case SYS_getdents: return sys_getdents((getdents_args_t *)args); case SYS_brk: return (int) sys_brk((void *)args); case SYS_lseek: return sys_lseek((lseek_args_t *)args); case SYS_halt: sys_halt(); return -1; case SYS_set_errno: curthr->kt_errno = (int)args; return 0; case SYS_errno: return curthr->kt_errno; case SYS_execve: return sys_execve((execve_args_t *)args, regs); case SYS_stat: return sys_stat((stat_args_t *)args); case SYS_uname: return sys_uname((struct utsname *)args); case SYS_debug: return sys_debug((argstr_t *)args); case SYS_kshell: return sys_kshell((int)args); default: dbg(DBG_ERROR, "ERROR: unknown system call: %d (args: %#08x)\n", sysnum, args); curthr->kt_errno = ENOSYS; return -1; } }
asmlinkage int osf_umount(char * path, int flag) { return sys_umount(path); }
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 defined(CONFIG_MTD_BLOCK) || defined(CONFIG_MTD_BLOCK_RO) /* Allow specification of MTD device by name, e.g. * root=/dev/mtdblock:foo * Similar to JFFS2-specific hack in prepare_namespace(), * but more generic. */ if (strncmp(name, "mtdblock:", sizeof("mtdblock:") - 1) == 0) { struct mtd_info *mtd = get_mtd_device_nm(name + sizeof("mtdblock:") - 1); if (unlikely(!mtd)) goto fail; sprintf(name, "mtdblock%d", mtd->index); put_mtd_device(mtd); } #endif 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 void __init handle_initrd(void) { int error; int pid; real_root_dev = new_encode_dev(ROOT_DEV); create_dev("/dev/root.old", Root_RAM0); /* mount initrd on rootfs' /root */ mount_block_root("/dev/root.old", root_mountflags & ~MS_RDONLY); sys_mkdir("/old", 0700); root_fd = sys_open("/", 0, 0); old_fd = sys_open("/old", 0, 0); /* move initrd over / and chdir/chroot in initrd root */ sys_chdir("/root"); sys_mount(".", "/", NULL, MS_MOVE, NULL); sys_chroot("."); pid = kernel_thread(do_linuxrc, "/linuxrc", SIGCHLD); if (pid > 0) { while (pid != sys_wait4(-1, NULL, 0, NULL)) { try_to_freeze(); 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_close(old_fd); sys_close(root_fd); if (new_decode_dev(real_root_dev) == Root_RAM0) { sys_chdir("/old"); return; } ROOT_DEV = new_decode_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 = sys_open("/dev/root.old", O_RDWR, 0); if (error == -ENOENT) printk("/initrd does not exist. Ignored.\n"); else 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); sys_close(fd); } printk(!error ? "okay\n" : "failed\n"); } }
void __init umount_devfs(char *path) { sys_umount(path, 0); }
asmlinkage int sys_oldumount(char * name) { return sys_umount(name,0); }