19 static void seq_set_overflow(struct seq_file *m)  in seq_set_overflow()  argument
21 	m->count = m->size;  in seq_set_overflow()
90 static int traverse(struct seq_file *m, loff_t offset)  in traverse()  argument
96 	m->version = 0;  in traverse()
98 	m->count = m->from = 0;  in traverse()
100 		m->index = index;  in traverse()
103 	if (!m->buf) {  in traverse()
104 		m->buf = seq_buf_alloc(m->size = PAGE_SIZE);  in traverse()
105 		if (!m->buf)  in traverse()
108 	p = m->op->start(m, &index);  in traverse()
113 		error = m->op->show(m, p);  in traverse()
118 			m->count = 0;  in traverse()
120 		if (seq_has_overflowed(m))  in traverse()
122 		if (pos + m->count > offset) {  in traverse()
123 			m->from = offset - pos;  in traverse()
124 			m->count -= m->from;  in traverse()
125 			m->index = index;  in traverse()
128 		pos += m->count;  in traverse()
129 		m->count = 0;  in traverse()
132 			m->index = index;  in traverse()
135 		p = m->op->next(m, p, &index);  in traverse()
137 	m->op->stop(m, p);  in traverse()
138 	m->index = index;  in traverse()
142 	m->op->stop(m, p);  in traverse()
143 	kvfree(m->buf);  in traverse()
144 	m->count = 0;  in traverse()
145 	m->buf = seq_buf_alloc(m->size <<= 1);  in traverse()
146 	return !m->buf ? -ENOMEM : -EAGAIN;  in traverse()
160 	struct seq_file *m = file->private_data;  in seq_read()  local
167 	mutex_lock(&m->lock);  in seq_read()
180 	m->version = file->f_version;  in seq_read()
183 	if (unlikely(*ppos != m->read_pos)) {  in seq_read()
184 		while ((err = traverse(m, *ppos)) == -EAGAIN)  in seq_read()
188 			m->read_pos = 0;  in seq_read()
189 			m->version = 0;  in seq_read()
190 			m->index = 0;  in seq_read()
191 			m->count = 0;  in seq_read()
194 			m->read_pos = *ppos;  in seq_read()
199 	if (!m->buf) {  in seq_read()
200 		m->buf = seq_buf_alloc(m->size = PAGE_SIZE);  in seq_read()
201 		if (!m->buf)  in seq_read()
205 	if (m->count) {  in seq_read()
206 		n = min(m->count, size);  in seq_read()
207 		err = copy_to_user(buf, m->buf + m->from, n);  in seq_read()
210 		m->count -= n;  in seq_read()
211 		m->from += n;  in seq_read()
215 		if (!m->count)  in seq_read()
216 			m->index++;  in seq_read()
221 	pos = m->index;  in seq_read()
222 	p = m->op->start(m, &pos);  in seq_read()
227 		err = m->op->show(m, p);  in seq_read()
231 			m->count = 0;  in seq_read()
232 		if (unlikely(!m->count)) {  in seq_read()
233 			p = m->op->next(m, p, &pos);  in seq_read()
234 			m->index = pos;  in seq_read()
237 		if (m->count < m->size)  in seq_read()
239 		m->op->stop(m, p);  in seq_read()
240 		kvfree(m->buf);  in seq_read()
241 		m->count = 0;  in seq_read()
242 		m->buf = seq_buf_alloc(m->size <<= 1);  in seq_read()
243 		if (!m->buf)  in seq_read()
245 		m->version = 0;  in seq_read()
246 		pos = m->index;  in seq_read()
247 		p = m->op->start(m, &pos);  in seq_read()
249 	m->op->stop(m, p);  in seq_read()
250 	m->count = 0;  in seq_read()
254 	while (m->count < size) {  in seq_read()
255 		size_t offs = m->count;  in seq_read()
257 		p = m->op->next(m, p, &next);  in seq_read()
262 		err = m->op->show(m, p);  in seq_read()
263 		if (seq_has_overflowed(m) || err) {  in seq_read()
264 			m->count = offs;  in seq_read()
270 	m->op->stop(m, p);  in seq_read()
271 	n = min(m->count, size);  in seq_read()
272 	err = copy_to_user(buf, m->buf, n);  in seq_read()
276 	m->count -= n;  in seq_read()
277 	if (m->count)  in seq_read()
278 		m->from = n;  in seq_read()
281 	m->index = pos;  in seq_read()
287 		m->read_pos += copied;  in seq_read()
289 	file->f_version = m->version;  in seq_read()
290 	mutex_unlock(&m->lock);  in seq_read()
311 	struct seq_file *m = file->private_data;  in seq_lseek()  local
314 	mutex_lock(&m->lock);  in seq_lseek()
315 	m->version = file->f_version;  in seq_lseek()
323 		if (offset != m->read_pos) {  in seq_lseek()
324 			while ((retval = traverse(m, offset)) == -EAGAIN)  in seq_lseek()
329 				m->read_pos = 0;  in seq_lseek()
330 				m->version = 0;  in seq_lseek()
331 				m->index = 0;  in seq_lseek()
332 				m->count = 0;  in seq_lseek()
334 				m->read_pos = offset;  in seq_lseek()
341 	file->f_version = m->version;  in seq_lseek()
342 	mutex_unlock(&m->lock);  in seq_lseek()
357 	struct seq_file *m = file->private_data;  in seq_release()  local
358 	kvfree(m->buf);  in seq_release()
359 	kfree(m);  in seq_release()
374 int seq_escape(struct seq_file *m, const char *s, const char *esc)  in seq_escape()  argument
376 	char *end = m->buf + m->size;  in seq_escape()
380         for (p = m->buf + m->count; (c = *s) != '\0' && p < end; s++) {  in seq_escape()
392 		seq_set_overflow(m);  in seq_escape()
395 	m->count = p - m->buf;  in seq_escape()
400 int seq_vprintf(struct seq_file *m, const char *f, va_list args)  in seq_vprintf()  argument
404 	if (m->count < m->size) {  in seq_vprintf()
405 		len = vsnprintf(m->buf + m->count, m->size - m->count, f, args);  in seq_vprintf()
406 		if (m->count + len < m->size) {  in seq_vprintf()
407 			m->count += len;  in seq_vprintf()
411 	seq_set_overflow(m);  in seq_vprintf()
416 int seq_printf(struct seq_file *m, const char *f, ...)  in seq_printf()  argument
422 	ret = seq_vprintf(m, f, args);  in seq_printf()
470 int seq_path(struct seq_file *m, const struct path *path, const char *esc)  in seq_path()  argument
473 	size_t size = seq_get_buf(m, &buf);  in seq_path()
484 	seq_commit(m, res);  in seq_path()
493 int seq_path_root(struct seq_file *m, const struct path *path,  in seq_path_root()  argument
497 	size_t size = seq_get_buf(m, &buf);  in seq_path_root()
515 	seq_commit(m, res);  in seq_path_root()
523 int seq_dentry(struct seq_file *m, struct dentry *dentry, const char *esc)  in seq_dentry()  argument
526 	size_t size = seq_get_buf(m, &buf);  in seq_dentry()
537 	seq_commit(m, res);  in seq_dentry()
648 int seq_putc(struct seq_file *m, char c)  in seq_putc()  argument
650 	if (m->count < m->size) {  in seq_putc()
651 		m->buf[m->count++] = c;  in seq_putc()
658 int seq_puts(struct seq_file *m, const char *s)  in seq_puts()  argument
661 	if (m->count + len < m->size) {  in seq_puts()
662 		memcpy(m->buf + m->count, s, len);  in seq_puts()
663 		m->count += len;  in seq_puts()
666 	seq_set_overflow(m);  in seq_puts()
678 int seq_put_decimal_ull(struct seq_file *m, char delimiter,  in seq_put_decimal_ull()  argument
683 	if (m->count + 2 >= m->size) /* we'll write 2 bytes at least */  in seq_put_decimal_ull()
687 		m->buf[m->count++] = delimiter;  in seq_put_decimal_ull()
690 		m->buf[m->count++] = num + '0';  in seq_put_decimal_ull()
694 	len = num_to_str(m->buf + m->count, m->size - m->count, num);  in seq_put_decimal_ull()
697 	m->count += len;  in seq_put_decimal_ull()
700 	seq_set_overflow(m);  in seq_put_decimal_ull()
705 int seq_put_decimal_ll(struct seq_file *m, char delimiter,  in seq_put_decimal_ll()  argument
709 		if (m->count + 3 >= m->size) {  in seq_put_decimal_ll()
710 			seq_set_overflow(m);  in seq_put_decimal_ll()
714 			m->buf[m->count++] = delimiter;  in seq_put_decimal_ll()
718 	return seq_put_decimal_ull(m, delimiter, num);  in seq_put_decimal_ll()
748 void seq_pad(struct seq_file *m, char c)  in seq_pad()  argument
750 	int size = m->pad_until - m->count;  in seq_pad()
752 		seq_printf(m, "%*s", size, "");  in seq_pad()
754 		seq_putc(m, c);  in seq_pad()