static int snapshot_open(struct inode *inode, struct file *filp) { struct snapshot_data *data; int error; lock_system_sleep(); if (!atomic_add_unless(&snapshot_device_available, -1, 0)) { error = -EBUSY; goto Unlock; } if ((filp->f_flags & O_ACCMODE) == O_RDWR) { atomic_inc(&snapshot_device_available); error = -ENOSYS; goto Unlock; } if(create_basic_memory_bitmaps()) { atomic_inc(&snapshot_device_available); error = -ENOMEM; goto Unlock; } nonseekable_open(inode, filp); data = &snapshot_state; filp->private_data = data; memset(&data->handle, 0, sizeof(struct snapshot_handle)); if ((filp->f_flags & O_ACCMODE) == O_RDONLY) { /* Hibernating. The image device should be accessible. */ data->swap = swsusp_resume_device ? swap_type_of(swsusp_resume_device, 0, NULL) : -1; data->mode = O_RDONLY; error = pm_notifier_call_chain(PM_HIBERNATION_PREPARE); if (error) pm_notifier_call_chain(PM_POST_HIBERNATION); } else { /* * Resuming. We may need to wait for the image device to * appear. */ wait_for_device_probe(); data->swap = -1; data->mode = O_WRONLY; error = pm_notifier_call_chain(PM_RESTORE_PREPARE); if (error) pm_notifier_call_chain(PM_POST_RESTORE); } if (error) { free_basic_memory_bitmaps(); atomic_inc(&snapshot_device_available); } data->frozen = 0; data->ready = 0; data->platform_support = 0; Unlock: unlock_system_sleep(); return error; }
/* * Prepare the namespace - decide what/where to mount, load ramdisks, etc. */ void __init prepare_namespace(void) { int is_floppy; if (root_delay) { printk(KERN_INFO "Waiting %dsec before mounting root device...\n", root_delay); ssleep(root_delay); } /* * wait for the known devices to complete their probing * * Note: this is a potential source of long boot delays. * For example, it is not atypical to wait 5 seconds here * for the touchpad of a laptop to initialize. */ wait_for_device_probe(); md_run_setup(); if (saved_root_name[0]) { root_device_name = saved_root_name; printk(KERN_DEBUG "root_device_name: %s\n",root_device_name); if (!strncmp(root_device_name, "mtd", 3) || !strncmp(root_device_name, "ubi", 3)) { mount_block_root(root_device_name, root_mountflags); goto out; } ROOT_DEV = name_to_dev_t(root_device_name); if (strncmp(root_device_name, "/dev/", 5) == 0) root_device_name += 5; } if (initrd_load()) goto out; /* wait for any asynchronous scanning to complete */ if ((ROOT_DEV == 0) && root_wait) { printk(KERN_INFO "Waiting for root device %s...\n", saved_root_name); while (driver_probe_done() != 0 || (ROOT_DEV = name_to_dev_t(saved_root_name)) == 0) msleep(100); async_synchronize_full(); } is_floppy = MAJOR(ROOT_DEV) == FLOPPY_MAJOR; if (is_floppy && rd_doload && rd_load_disk(0)) ROOT_DEV = Root_RAM0; mount_root(); out: devtmpfs_mount("dev"); printk(KERN_DEBUG "after devtmpfs_mount\n"); sys_mount(".", "/", NULL, MS_MOVE, NULL); printk(KERN_DEBUG "after sys_mount\n"); sys_chroot((const char __user __force *)"."); }
static int __init wait_scan_init(void) { /* * First we need to wait for device probing to finish; * the drivers we just loaded might just still be probing * and might not yet have reached the scsi async scanning */ wait_for_device_probe(); /* * and then we wait for the actual asynchronous scsi scan * to finish. */ scsi_complete_async_scans(); return 0; }
/** * toi_open_bdev: Open a bdev at resume time. * * index: The swap index. May be MAX_SWAPFILES for the resume_dev_t * (the user can have resume= pointing at a swap partition/file that isn't * swapon'd when they hibernate. MAX_SWAPFILES+1 for the first page of the * header. It will be from a swap partition that was enabled when we hibernated, * but we don't know it's real index until we read that first page. * dev_t: The device major/minor. * display_errs: Whether to try to do this quietly. * * We stored a dev_t in the image header. Open the matching device without * requiring /dev/<whatever> in most cases and record the details needed * to close it later and avoid duplicating work. */ struct block_device *toi_open_bdev(char *uuid, dev_t default_device, int display_errs) { struct block_device *bdev; dev_t device = default_device; char buf[32]; int retried = 0; retry: if (uuid) { struct fs_info seek; strncpy((char *)&seek.uuid, uuid, 16); seek.dev_t = 0; seek.last_mount_size = 0; device = blk_lookup_fs_info(&seek); if (!device) { device = default_device; printk(KERN_DEBUG "Unable to resolve uuid. Falling back" " to dev_t.\n"); } else printk(KERN_DEBUG "Resolved uuid to device %s.\n", format_dev_t(buf, device)); } if (!device) { printk(KERN_ERR "TuxOnIce attempting to open a " "blank dev_t!\n"); dump_stack(); return NULL; } bdev = toi_open_by_devnum(device); if (IS_ERR(bdev) || !bdev) { if (!retried) { retried = 1; wait_for_device_probe(); goto retry; } if (display_errs) toi_early_boot_message(1, TOI_CONTINUE_REQ, "Failed to get access to block device " "\"%x\" (error %d).\n Maybe you need " "to run mknod and/or lvmsetup in an " "initrd/ramfs?", device, bdev); return ERR_PTR(-EINVAL); } toi_message(TOI_BIO, TOI_VERBOSE, 0, "TuxOnIce got bdev %p for dev_t %x.", bdev, device); return bdev; }
static int mxr_video_open(struct file *file) { struct mxr_layer *layer = video_drvdata(file); struct mxr_device *mdev = layer->mdev; int ret = 0; mxr_dbg(mdev, "%s:%d\n", __func__, __LINE__); /* assure device probe is finished */ wait_for_device_probe(); /* creating context for file descriptor */ ret = v4l2_fh_open(file); if (ret) { mxr_err(mdev, "v4l2_fh_open failed\n"); return ret; } /* leaving if layer is already initialized */ if (!v4l2_fh_is_singular_file(file)) return 0; ret = vb2_queue_init(&layer->vb_queue); if (ret != 0) { mxr_err(mdev, "failed to initialize vb2 queue\n"); goto fail_fh_open; } /* set default format, first on the list */ layer->fmt = layer->fmt_array[0]; /* setup default geometry */ mxr_layer_default_geo(layer); return 0; fail_fh_open: v4l2_fh_release(file); return ret; }
/** * software_resume - Resume from a saved hibernation image. * * This routine is called as a late initcall, when all devices have been * discovered and initialized already. * * The image reading code is called to see if there is a hibernation image * available for reading. If that is the case, devices are quiesced and the * contents of memory is restored from the saved image. * * If this is successful, control reappears in the restored target kernel in * hibernation_snapshot() which returns to hibernate(). Otherwise, the routine * attempts to recover gracefully and make the kernel return to the normal mode * of operation. */ static int software_resume(void) { int error, nr_calls = 0; /* * If the user said "noresume".. bail out early. */ if (noresume || !hibernation_available()) return 0; /* * name_to_dev_t() below takes a sysfs buffer mutex when sysfs * is configured into the kernel. Since the regular hibernate * trigger path is via sysfs which takes a buffer mutex before * calling hibernate functions (which take pm_mutex) this can * cause lockdep to complain about a possible ABBA deadlock * which cannot happen since we're in the boot code here and * sysfs can't be invoked yet. Therefore, we use a subclass * here to avoid lockdep complaining. */ mutex_lock_nested(&pm_mutex, SINGLE_DEPTH_NESTING); if (swsusp_resume_device) goto Check_image; if (!strlen(resume_file)) { error = -ENOENT; goto Unlock; } pr_debug("Checking hibernation image partition %s\n", resume_file); if (resume_delay) { pr_info("Waiting %dsec before reading resume device ...\n", resume_delay); ssleep(resume_delay); } /* Check if the device is there */ swsusp_resume_device = name_to_dev_t(resume_file); /* * name_to_dev_t is ineffective to verify parition if resume_file is in * integer format. (e.g. major:minor) */ if (isdigit(resume_file[0]) && resume_wait) { int partno; while (!get_gendisk(swsusp_resume_device, &partno)) msleep(10); } if (!swsusp_resume_device) { /* * Some device discovery might still be in progress; we need * to wait for this to finish. */ wait_for_device_probe(); if (resume_wait) { while ((swsusp_resume_device = name_to_dev_t(resume_file)) == 0) msleep(10); async_synchronize_full(); } swsusp_resume_device = name_to_dev_t(resume_file); if (!swsusp_resume_device) { error = -ENODEV; goto Unlock; } } Check_image: pr_debug("Hibernation image partition %d:%d present\n", MAJOR(swsusp_resume_device), MINOR(swsusp_resume_device)); pr_debug("Looking for hibernation image.\n"); error = swsusp_check(); if (error) goto Unlock; /* The snapshot device should not be opened while we're running */ if (!atomic_add_unless(&snapshot_device_available, -1, 0)) { error = -EBUSY; swsusp_close(FMODE_READ); goto Unlock; } pm_prepare_console(); error = __pm_notifier_call_chain(PM_RESTORE_PREPARE, -1, &nr_calls); if (error) { nr_calls--; goto Close_Finish; } pr_debug("Preparing processes for restore.\n"); error = freeze_processes(); if (error) goto Close_Finish; error = load_image_and_restore(); thaw_processes(); Finish: __pm_notifier_call_chain(PM_POST_RESTORE, nr_calls, NULL); pm_restore_console(); atomic_inc(&snapshot_device_available); /* For success case, the suspend path will release the lock */ Unlock: mutex_unlock(&pm_mutex); pr_debug("Hibernation image not present or could not be loaded.\n"); return error; Close_Finish: swsusp_close(FMODE_READ); goto Finish; }
static int __init mount_nfs_root(void) { char *root_dev, *root_data; unsigned int timeout; int try, err; err = nfs_root_data(&root_dev, &root_data); if (err != 0) return 0; /* * The server or network may not be ready, so try several * times. Stop after a few tries in case the client wants * to fall back to other boot methods. */ timeout = NFSROOT_TIMEOUT_MIN; for (try = 1; ; try++) { err = do_mount_root(root_dev, "nfs", root_mountflags, root_data); if (err == 0) return 1; if (try > NFSROOT_RETRY_MAX) break; /* Wait, in case the server refused us immediately */ ssleep(timeout); timeout <<= 1; if (timeout > NFSROOT_TIMEOUT_MAX) timeout = NFSROOT_TIMEOUT_MAX; } 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 (ROOT_DEV == Root_NFS) { 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 #ifdef CONFIG_BLOCK create_dev("/dev/root", ROOT_DEV); mount_block_root("/dev/root", root_mountflags); #endif } /* * Prepare the namespace - decide what/where to mount, load ramdisks, etc. */ void __init prepare_namespace(void) { int is_floppy; if (root_delay) { printk(KERN_INFO "Waiting %dsec before mounting root device...\n", root_delay); ssleep(root_delay); } /* * wait for the known devices to complete their probing * * Note: this is a potential source of long boot delays. * For example, it is not atypical to wait 5 seconds here * for the touchpad of a laptop to initialize. */ wait_for_device_probe(); md_run_setup(); if (saved_root_name[0]) { root_device_name = saved_root_name; if (!strncmp(root_device_name, "mtd", 3) || !strncmp(root_device_name, "ubi", 3)) { mount_block_root(root_device_name, root_mountflags); goto out; } ROOT_DEV = name_to_dev_t(root_device_name); if (strncmp(root_device_name, "/dev/", 5) == 0) root_device_name += 5; } if (initrd_load()) goto out; /* wait for any asynchronous scanning to complete */ if ((ROOT_DEV == 0) && root_wait) { printk(KERN_INFO "Waiting for root device %s...\n", saved_root_name); while (driver_probe_done() != 0 || (ROOT_DEV = name_to_dev_t(saved_root_name)) == 0) msleep(100); async_synchronize_full(); } is_floppy = MAJOR(ROOT_DEV) == FLOPPY_MAJOR; if (is_floppy && rd_doload && rd_load_disk(0)) ROOT_DEV = Root_RAM0; mount_root(); out: devtmpfs_mount("dev"); sys_mount(".", "/", NULL, MS_MOVE, NULL); sys_chroot("."); }
static int software_resume(void) { int error; unsigned int flags; /* * If the user said "noresume".. bail out early. */ if (noresume) return 0; /* * name_to_dev_t() below takes a sysfs buffer mutex when sysfs * is configured into the kernel. Since the regular hibernate * trigger path is via sysfs which takes a buffer mutex before * calling hibernate functions (which take pm_mutex) this can * cause lockdep to complain about a possible ABBA deadlock * which cannot happen since we're in the boot code here and * sysfs can't be invoked yet. Therefore, we use a subclass * here to avoid lockdep complaining. */ mutex_lock_nested(&pm_mutex, SINGLE_DEPTH_NESTING); if (swsusp_resume_device) goto Check_image; if (!strlen(resume_file)) { error = -ENOENT; goto Unlock; } pr_debug("PM: Checking image partition %s\n", resume_file); /* Check if the device is there */ swsusp_resume_device = name_to_dev_t(resume_file); if (!swsusp_resume_device) { /* * Some device discovery might still be in progress; we need * to wait for this to finish. */ wait_for_device_probe(); /* * We can't depend on SCSI devices being available after loading * one of their modules until scsi_complete_async_scans() is * called and the resume device usually is a SCSI one. */ scsi_complete_async_scans(); swsusp_resume_device = name_to_dev_t(resume_file); if (!swsusp_resume_device) { error = -ENODEV; goto Unlock; } } Check_image: pr_debug("PM: Resume from partition %d:%d\n", MAJOR(swsusp_resume_device), MINOR(swsusp_resume_device)); pr_debug("PM: Checking hibernation image.\n"); error = swsusp_check(); if (error) goto Unlock; /* The snapshot device should not be opened while we're running */ if (!atomic_add_unless(&snapshot_device_available, -1, 0)) { error = -EBUSY; swsusp_close(FMODE_READ); goto Unlock; } pm_prepare_console(); error = pm_notifier_call_chain(PM_RESTORE_PREPARE); if (error) goto close_finish; error = usermodehelper_disable(); if (error) goto close_finish; error = create_basic_memory_bitmaps(); if (error) goto close_finish; pr_debug("PM: Preparing processes for restore.\n"); error = prepare_processes(); if (error) { swsusp_close(FMODE_READ); goto Done; } pr_debug("PM: Reading hibernation image.\n"); error = swsusp_read(&flags); swsusp_close(FMODE_READ); if (!error) hibernation_restore(flags & SF_PLATFORM_MODE); printk(KERN_ERR "PM: Restore failed, recovering.\n"); swsusp_free(); thaw_processes(); Done: free_basic_memory_bitmaps(); usermodehelper_enable(); Finish: pm_notifier_call_chain(PM_POST_RESTORE); pm_restore_console(); atomic_inc(&snapshot_device_available); /* For success case, the suspend path will release the lock */ Unlock: mutex_unlock(&pm_mutex); pr_debug("PM: Resume from disk failed.\n"); return error; close_finish: swsusp_close(FMODE_READ); goto Finish; }
static int __init wait_scan_init(void) { wait_for_device_probe(); scsi_complete_async_scans(); return 0; }
/* * Prepare the namespace - decide what/where to mount, load ramdisks, etc. */ void __init prepare_namespace(void) { int is_floppy; if (root_delay) { printk(KERN_INFO "Waiting %dsec before mounting root device...\n", root_delay); ssleep(root_delay); } /* * wait for the known devices to complete their probing * * Note: this is a potential source of long boot delays. * For example, it is not atypical to wait 5 seconds here * for the touchpad of a laptop to initialize. */ wait_for_device_probe(); md_run_setup(); if (saved_root_name[0]) { root_device_name = saved_root_name; if (!strncmp(root_device_name, "mtd", 3) || !strncmp(root_device_name, "ubi", 3)) { mount_block_root(root_device_name, root_mountflags); goto out; } #ifdef CONFIG_RTL_FLASH_DUAL_IMAGE_ENABLE extern int is_bank2_root(); //extern from rtl_gpio.c if(is_bank2_root()) //assume bank1 root is mtdblock1 , bank2's root is mtdblock3 strcpy(root_device_name,"/dev/mtdblock3"); #endif ROOT_DEV = name_to_dev_t(root_device_name); if (strncmp(root_device_name, "/dev/", 5) == 0) root_device_name += 5; } if (initrd_load()) goto out; /* wait for any asynchronous scanning to complete */ if ((ROOT_DEV == 0) && root_wait) { printk(KERN_INFO "Waiting for root device %s...\n", saved_root_name); while (driver_probe_done() != 0 || (ROOT_DEV = name_to_dev_t(saved_root_name)) == 0) msleep(100); async_synchronize_full(); } is_floppy = MAJOR(ROOT_DEV) == FLOPPY_MAJOR; if (is_floppy && rd_doload && rd_load_disk(0)) ROOT_DEV = Root_RAM0; mount_root(); out: sys_mount(".", "/", NULL, MS_MOVE, NULL); sys_chroot("."); }
/** * software_resume - Resume from a saved hibernation image. * * This routine is called as a late initcall, when all devices have been * discovered and initialized already. * * The image reading code is called to see if there is a hibernation image * available for reading. If that is the case, devices are quiesced and the * contents of memory is restored from the saved image. * * If this is successful, control reappears in the restored target kernel in * hibernation_snaphot() which returns to hibernate(). Otherwise, the routine * attempts to recover gracefully and make the kernel return to the normal mode * of operation. */ int software_resume(void) { int error; unsigned int flags; resume_attempted = 1; /* * We can't know (until an image header - if any - is loaded), whether * we did override swsusp. We therefore ensure that both are tried. */ try_tuxonice_resume(); /* * If the user said "noresume".. bail out early. */ if (noresume) return 0; /* * name_to_dev_t() below takes a sysfs buffer mutex when sysfs * is configured into the kernel. Since the regular hibernate * trigger path is via sysfs which takes a buffer mutex before * calling hibernate functions (which take pm_mutex) this can * cause lockdep to complain about a possible ABBA deadlock * which cannot happen since we're in the boot code here and * sysfs can't be invoked yet. Therefore, we use a subclass * here to avoid lockdep complaining. */ mutex_lock_nested(&pm_mutex, SINGLE_DEPTH_NESTING); if (swsusp_resume_device) goto Check_image; if (!strlen(resume_file)) { error = -ENOENT; goto Unlock; } pr_debug("PM: Checking hibernation image partition %s\n", resume_file); if (resume_delay) { printk(KERN_INFO "Waiting %dsec before reading resume device...\n", resume_delay); ssleep(resume_delay); } /* Check if the device is there */ swsusp_resume_device = name_to_dev_t(resume_file); /* * name_to_dev_t is ineffective to verify parition if resume_file is in * integer format. (e.g. major:minor) */ if (isdigit(resume_file[0]) && resume_wait) { int partno; while (!get_gendisk(swsusp_resume_device, &partno)) msleep(10); } if (!swsusp_resume_device) { /* * Some device discovery might still be in progress; we need * to wait for this to finish. */ wait_for_device_probe(); if (resume_wait) { while ((swsusp_resume_device = name_to_dev_t(resume_file)) == 0) msleep(10); async_synchronize_full(); } /* * We can't depend on SCSI devices being available after loading * one of their modules until scsi_complete_async_scans() is * called and the resume device usually is a SCSI one. */ scsi_complete_async_scans(); swsusp_resume_device = name_to_dev_t(resume_file); if (!swsusp_resume_device) { error = -ENODEV; goto Unlock; } } Check_image: pr_debug("PM: Hibernation image partition %d:%d present\n", MAJOR(swsusp_resume_device), MINOR(swsusp_resume_device)); pr_debug("PM: Looking for hibernation image.\n"); error = swsusp_check(); if (error) goto Unlock; /* The snapshot device should not be opened while we're running */ if (!atomic_add_unless(&snapshot_device_available, -1, 0)) { error = -EBUSY; swsusp_close(FMODE_READ); goto Unlock; } pm_prepare_console(); error = pm_notifier_call_chain(PM_RESTORE_PREPARE); if (error) goto close_finish; error = create_basic_memory_bitmaps(); if (error) goto close_finish; pr_debug("PM: Preparing processes for restore.\n"); error = freeze_processes(); if (error) { swsusp_close(FMODE_READ); goto Done; } pr_debug("PM: Loading hibernation image.\n"); error = swsusp_read(&flags); swsusp_close(FMODE_READ); if (!error) hibernation_restore(flags & SF_PLATFORM_MODE); printk(KERN_ERR "PM: Failed to load hibernation image, recovering.\n"); swsusp_free(); thaw_processes(); Done: free_basic_memory_bitmaps(); Finish: pm_notifier_call_chain(PM_POST_RESTORE); pm_restore_console(); atomic_inc(&snapshot_device_available); /* For success case, the suspend path will release the lock */ Unlock: mutex_unlock(&pm_mutex); pr_debug("PM: Hibernation image not present or could not be loaded.\n"); return error; close_finish: swsusp_close(FMODE_READ); goto Finish; }
int register_vfl(void) { wait_for_device_probe(); return apple_vfl_register(&vfl, APPLE_VFL_NEW_STYLE); }