static ssize_t snapshot_write(struct file *filp, const char __user *buf, size_t count, loff_t *offp) { struct snapshot_data *data; ssize_t res; loff_t pg_offp = *offp & ~PAGE_MASK; mutex_lock(&pm_mutex); data = filp->private_data; if (!pg_offp) { res = snapshot_write_next(&data->handle); if (res <= 0) goto unlock; } else { res = PAGE_SIZE - pg_offp; } res = simple_write_to_buffer(data_of(data->handle), res, &pg_offp, buf, count); if (res > 0) *offp += res; unlock: mutex_unlock(&pm_mutex); return res; }
int swsusp_read(void) { int error; struct swap_map_handle handle; struct snapshot_handle snapshot; struct swsusp_info *header; if (IS_ERR(resume_bdev)) { pr_debug("swsusp: block device not initialised\n"); return PTR_ERR(resume_bdev); } memset(&snapshot, 0, sizeof(struct snapshot_handle)); error = snapshot_write_next(&snapshot, PAGE_SIZE); if (error < PAGE_SIZE) return error < 0 ? error : -EFAULT; header = (struct swsusp_info *)data_of(snapshot); error = get_swap_reader(&handle, swsusp_header.image); if (!error) error = swap_read_page(&handle, header); if (!error) error = load_image(&handle, &snapshot, header->pages - 1); release_swap_reader(&handle); blkdev_put(resume_bdev); if (!error) pr_debug("swsusp: Reading resume file was successful\n"); else pr_debug("swsusp: Error %d resuming\n", error); return error; }
static int load_image(struct swap_map_handle *handle, struct snapshot_handle *snapshot, unsigned int nr_pages) { unsigned int m; int ret; int error = 0; printk("Loading image data pages (%u pages) ... ", nr_pages); m = nr_pages / 100; if (!m) m = 1; nr_pages = 0; do { ret = snapshot_write_next(snapshot, PAGE_SIZE); if (ret > 0) { error = swap_read_page(handle, data_of(*snapshot)); if (error) break; if (!(nr_pages % m)) printk("\b\b\b\b%3d%%", nr_pages / m); nr_pages++; } } while (ret > 0); if (!error) { printk("\b\b\b\bdone\n"); if (!snapshot_image_loaded(snapshot)) error = -ENODATA; } return error; }
int swsusp_read(unsigned int *flags_p) { int error; struct swap_map_handle handle; struct snapshot_handle snapshot; struct swsusp_info *header; *flags_p = swsusp_header->flags; if (IS_ERR(resume_bdev)) { pr_debug("PM: Image device not initialised\n"); return PTR_ERR(resume_bdev); } memset(&snapshot, 0, sizeof(struct snapshot_handle)); error = snapshot_write_next(&snapshot, PAGE_SIZE); if (error < PAGE_SIZE) return error < 0 ? error : -EFAULT; header = (struct swsusp_info *)data_of(snapshot); error = get_swap_reader(&handle, swsusp_header->image); if (!error) error = swap_read_page(&handle, header, NULL); if (!error) error = load_image(&handle, &snapshot, header->pages - 1); release_swap_reader(&handle); if (!error) pr_debug("PM: Image successfully loaded\n"); else pr_debug("PM: Error %d resuming\n", error); return error; }
static int load_image(struct swap_map_handle *handle, struct snapshot_handle *snapshot, unsigned int nr_to_read) { unsigned int m; int error = 0; struct timeval start; struct timeval stop; struct bio *bio; int err2; unsigned nr_pages; printk(KERN_INFO "PM: Loading image data pages (%u pages) ... ", nr_to_read); m = nr_to_read / 100; if (!m) m = 1; nr_pages = 0; bio = NULL; do_gettimeofday(&start); for ( ; ; ) { error = snapshot_write_next(snapshot, PAGE_SIZE); if (error <= 0) break; error = swap_read_page(handle, data_of(*snapshot), &bio); if (error) break; if (snapshot->sync_read) error = hib_wait_on_bio_chain(&bio); if (error) break; if (!(nr_pages % m)) printk("\b\b\b\b%3d%%", nr_pages / m); nr_pages++; } err2 = hib_wait_on_bio_chain(&bio); do_gettimeofday(&stop); if (!error) error = err2; if (!error) { printk("\b\b\b\bdone\n"); snapshot_write_finalize(snapshot); if (!snapshot_image_loaded(snapshot)) error = -ENODATA; } else printk("\n"); swsusp_show_speed(&start, &stop, nr_to_read, "Read"); return error; }
static ssize_t snapshot_write(struct file *filp, const char __user *buf, size_t count, loff_t *offp) { struct snapshot_data *data; ssize_t res; data = filp->private_data; res = snapshot_write_next(&data->handle, count); if (res > 0) { if (copy_from_user(data_of(data->handle), buf, res)) res = -EFAULT; else *offp = data->handle.offset; } return res; }