1 // SPDX-License-Identifier: GPL-2.0-only
36 	bool ready;  member
49 	struct snapshot_data *data;  in snapshot_open()  local
54 		return -EPERM;  in snapshot_open()
59 		error = -EBUSY;  in snapshot_open()
63 	if ((filp->f_flags & O_ACCMODE) == O_RDWR) {  in snapshot_open()
65 		error = -ENOSYS;  in snapshot_open()
69 	data = &snapshot_state;  in snapshot_open()
70 	filp->private_data = data;  in snapshot_open()
71 	memset(&data->handle, 0, sizeof(struct snapshot_handle));  in snapshot_open()
72 	if ((filp->f_flags & O_ACCMODE) == O_RDONLY) {  in snapshot_open()
74 		data->swap = swap_type_of(swsusp_resume_device, 0);  in snapshot_open()
75 		data->mode = O_RDONLY;  in snapshot_open()
76 		data->free_bitmaps = false;  in snapshot_open()
85 		data->swap = -1;  in snapshot_open()
86 		data->mode = O_WRONLY;  in snapshot_open()
90 			data->free_bitmaps = !error;  in snapshot_open()
96 	data->frozen = false;  in snapshot_open()
97 	data->ready = false;  in snapshot_open()
98 	data->platform_support = false;  in snapshot_open()
99 	data->dev = 0;  in snapshot_open()
109 	struct snapshot_data *data;  in snapshot_release()  local
115 	data = filp->private_data;  in snapshot_release()
116 	data->dev = 0;  in snapshot_release()
117 	free_all_swap_pages(data->swap);  in snapshot_release()
118 	if (data->frozen) {  in snapshot_release()
122 	} else if (data->free_bitmaps) {  in snapshot_release()
125 	pm_notifier_call_chain(data->mode == O_RDONLY ?  in snapshot_release()
138 	struct snapshot_data *data;  in snapshot_read()  local
144 	data = filp->private_data;  in snapshot_read()
145 	if (!data->ready) {  in snapshot_read()
146 		res = -ENODATA;  in snapshot_read()
150 		res = snapshot_read_next(&data->handle);  in snapshot_read()
154 		res = PAGE_SIZE - pg_offp;  in snapshot_read()
158 			data_of(data->handle), res);  in snapshot_read()
172 	struct snapshot_data *data;  in snapshot_write()  local
183 	data = filp->private_data;  in snapshot_write()
186 		res = snapshot_write_next(&data->handle);  in snapshot_write()
193 	if (!data_of(data->handle)) {  in snapshot_write()
194 		res = -EINVAL;  in snapshot_write()
198 	res = simple_write_to_buffer(data_of(data->handle), res, &pg_offp,  in snapshot_write()
213 static int snapshot_set_swap_area(struct snapshot_data *data,  in snapshot_set_swap_area()  argument
220 		return -EPERM;  in snapshot_set_swap_area()
226 			return -EFAULT;  in snapshot_set_swap_area()
233 			return -EFAULT;  in snapshot_set_swap_area()
239 	 * User space encodes device types as two-byte values,  in snapshot_set_swap_area()
242 	data->swap = swap_type_of(swdev, offset);  in snapshot_set_swap_area()
243 	if (data->swap < 0)  in snapshot_set_swap_area()
244 		return swdev ? -ENODEV : -EINVAL;  in snapshot_set_swap_area()
245 	data->dev = swdev;  in snapshot_set_swap_area()
253 	struct snapshot_data *data;  in snapshot_ioctl()  local
263 		return -ENOTTY;  in snapshot_ioctl()
265 		return -ENOTTY;  in snapshot_ioctl()
267 		return -EPERM;  in snapshot_ioctl()
270 		return -EBUSY;  in snapshot_ioctl()
273 	data = filp->private_data;  in snapshot_ioctl()
278 		if (data->frozen)  in snapshot_ioctl()
291 			data->frozen = true;  in snapshot_ioctl()
296 		if (!data->frozen || data->ready)  in snapshot_ioctl()
300 		data->free_bitmaps = false;  in snapshot_ioctl()
302 		data->frozen = false;  in snapshot_ioctl()
306 		if (data->mode != O_RDONLY || !data->frozen  || data->ready) {  in snapshot_ioctl()
307 			error = -EPERM;  in snapshot_ioctl()
311 		error = hibernation_snapshot(data->platform_support);  in snapshot_ioctl()
314 			data->ready = !freezer_test_done && !error;  in snapshot_ioctl()
320 		error = snapshot_write_finalize(&data->handle);  in snapshot_ioctl()
323 		if (data->mode != O_WRONLY || !data->frozen ||  in snapshot_ioctl()
324 		    !snapshot_image_loaded(&data->handle)) {  in snapshot_ioctl()
325 			error = -EPERM;  in snapshot_ioctl()
328 		error = hibernation_restore(data->platform_support);  in snapshot_ioctl()
333 		memset(&data->handle, 0, sizeof(struct snapshot_handle));  in snapshot_ioctl()
334 		data->ready = false;  in snapshot_ioctl()
351 		if (!data->ready) {  in snapshot_ioctl()
352 			error = -ENODATA;  in snapshot_ioctl()
361 		size = count_swap_pages(data->swap, 1);  in snapshot_ioctl()
367 		if (data->swap < 0 || data->swap >= MAX_SWAPFILES) {  in snapshot_ioctl()
368 			error = -ENODEV;  in snapshot_ioctl()
371 		offset = alloc_swapdev_block(data->swap);  in snapshot_ioctl()
376 			error = -ENOSPC;  in snapshot_ioctl()
381 		if (data->swap < 0 || data->swap >= MAX_SWAPFILES) {  in snapshot_ioctl()
382 			error = -ENODEV;  in snapshot_ioctl()
385 		free_all_swap_pages(data->swap);  in snapshot_ioctl()
389 		if (!data->frozen) {  in snapshot_ioctl()
390 			error = -EPERM;  in snapshot_ioctl()
398 		data->ready = false;  in snapshot_ioctl()
402 		data->platform_support = !!arg;  in snapshot_ioctl()
406 		if (data->platform_support)  in snapshot_ioctl()
411 		error = snapshot_set_swap_area(data, (void __user *)arg);  in snapshot_ioctl()
415 		error = -ENOTTY;  in snapshot_ioctl()