Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | /* |
3 | * linux/fs/seq_file.c | |
4 | * | |
5 | * helper functions for making synthetic files from sequences of records. | |
6 | * initial implementation -- AV, Oct 2001. | |
7 | */ | |
8 | ||
a3963015 JP |
9 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
10 | ||
09652320 | 11 | #include <linux/cache.h> |
1da177e4 | 12 | #include <linux/fs.h> |
630d9c47 | 13 | #include <linux/export.h> |
1da177e4 | 14 | #include <linux/seq_file.h> |
058504ed | 15 | #include <linux/vmalloc.h> |
1da177e4 | 16 | #include <linux/slab.h> |
adb37c4c | 17 | #include <linux/cred.h> |
058504ed | 18 | #include <linux/mm.h> |
37607102 | 19 | #include <linux/printk.h> |
25c6bb76 | 20 | #include <linux/string_helpers.h> |
d4d50710 | 21 | #include <linux/uio.h> |
1da177e4 | 22 | |
7c0f6ba6 | 23 | #include <linux/uaccess.h> |
1da177e4 LT |
24 | #include <asm/page.h> |
25 | ||
09652320 AD |
26 | static struct kmem_cache *seq_file_cache __ro_after_init; |
27 | ||
e075f591 KH |
28 | static void seq_set_overflow(struct seq_file *m) |
29 | { | |
30 | m->count = m->size; | |
31 | } | |
32 | ||
058504ed HC |
33 | static void *seq_buf_alloc(unsigned long size) |
34 | { | |
8cae8cd8 ES |
35 | if (unlikely(size > MAX_RW_COUNT)) |
36 | return NULL; | |
37 | ||
d64d01a1 | 38 | return kvmalloc(size, GFP_KERNEL_ACCOUNT); |
058504ed HC |
39 | } |
40 | ||
1da177e4 LT |
41 | /** |
42 | * seq_open - initialize sequential file | |
43 | * @file: file we initialize | |
44 | * @op: method table describing the sequence | |
45 | * | |
46 | * seq_open() sets @file, associating it with a sequence described | |
47 | * by @op. @op->start() sets the iterator up and returns the first | |
48 | * element of sequence. @op->stop() shuts it down. @op->next() | |
49 | * returns the next element of sequence. @op->show() prints element | |
50 | * into the buffer. In case of error ->start() and ->next() return | |
51 | * ERR_PTR(error). In the end of sequence they return %NULL. ->show() | |
52 | * returns 0 in case of success and negative number in case of error. | |
521b5d0c | 53 | * Returning SEQ_SKIP means "discard this element and move on". |
460b865e YD |
54 | * Note: seq_open() will allocate a struct seq_file and store its |
55 | * pointer in @file->private_data. This pointer should not be modified. | |
1da177e4 | 56 | */ |
15ad7cdc | 57 | int seq_open(struct file *file, const struct seq_operations *op) |
1da177e4 | 58 | { |
189f9841 YD |
59 | struct seq_file *p; |
60 | ||
61 | WARN_ON(file->private_data); | |
62 | ||
09652320 | 63 | p = kmem_cache_zalloc(seq_file_cache, GFP_KERNEL); |
189f9841 YD |
64 | if (!p) |
65 | return -ENOMEM; | |
66 | ||
67 | file->private_data = p; | |
1abe77b0 | 68 | |
0ac1759a | 69 | mutex_init(&p->lock); |
1da177e4 | 70 | p->op = op; |
34dbbcdb LT |
71 | |
72 | // No refcounting: the lifetime of 'p' is constrained | |
73 | // to the lifetime of the file. | |
74 | p->file = file; | |
1da177e4 | 75 | |
8f19d472 EB |
76 | /* |
77 | * seq_files support lseek() and pread(). They do not implement | |
78 | * write() at all, but we clear FMODE_PWRITE here for historical | |
79 | * reasons. | |
80 | * | |
81 | * If a client of seq_files a) implements file.write() and b) wishes to | |
82 | * support pwrite() then that client will need to implement its own | |
83 | * file.open() which calls seq_open() and then sets FMODE_PWRITE. | |
84 | */ | |
85 | file->f_mode &= ~FMODE_PWRITE; | |
1da177e4 LT |
86 | return 0; |
87 | } | |
88 | EXPORT_SYMBOL(seq_open); | |
89 | ||
33da8892 EB |
90 | static int traverse(struct seq_file *m, loff_t offset) |
91 | { | |
1f4aace6 | 92 | loff_t pos = 0; |
33da8892 EB |
93 | int error = 0; |
94 | void *p; | |
95 | ||
1f4aace6 | 96 | m->index = 0; |
33da8892 | 97 | m->count = m->from = 0; |
1f4aace6 | 98 | if (!offset) |
33da8892 | 99 | return 0; |
1f4aace6 | 100 | |
33da8892 | 101 | if (!m->buf) { |
058504ed | 102 | m->buf = seq_buf_alloc(m->size = PAGE_SIZE); |
33da8892 EB |
103 | if (!m->buf) |
104 | return -ENOMEM; | |
105 | } | |
1f4aace6 | 106 | p = m->op->start(m, &m->index); |
33da8892 EB |
107 | while (p) { |
108 | error = PTR_ERR(p); | |
109 | if (IS_ERR(p)) | |
110 | break; | |
111 | error = m->op->show(m, p); | |
112 | if (error < 0) | |
113 | break; | |
114 | if (unlikely(error)) { | |
115 | error = 0; | |
116 | m->count = 0; | |
117 | } | |
1f33c41c | 118 | if (seq_has_overflowed(m)) |
33da8892 | 119 | goto Eoverflow; |
6a2aeab5 | 120 | p = m->op->next(m, p, &m->index); |
33da8892 EB |
121 | if (pos + m->count > offset) { |
122 | m->from = offset - pos; | |
123 | m->count -= m->from; | |
33da8892 EB |
124 | break; |
125 | } | |
126 | pos += m->count; | |
127 | m->count = 0; | |
1f4aace6 | 128 | if (pos == offset) |
33da8892 | 129 | break; |
33da8892 EB |
130 | } |
131 | m->op->stop(m, p); | |
132 | return error; | |
133 | ||
134 | Eoverflow: | |
135 | m->op->stop(m, p); | |
058504ed | 136 | kvfree(m->buf); |
801a7605 | 137 | m->count = 0; |
058504ed | 138 | m->buf = seq_buf_alloc(m->size <<= 1); |
33da8892 EB |
139 | return !m->buf ? -ENOMEM : -EAGAIN; |
140 | } | |
141 | ||
1da177e4 LT |
142 | /** |
143 | * seq_read - ->read() method for sequential files. | |
67be2dd1 MW |
144 | * @file: the file to read from |
145 | * @buf: the buffer to read to | |
146 | * @size: the maximum number of bytes to read | |
147 | * @ppos: the current position in the file | |
1da177e4 LT |
148 | * |
149 | * Ready-made ->f_op->read() | |
150 | */ | |
151 | ssize_t seq_read(struct file *file, char __user *buf, size_t size, loff_t *ppos) | |
152 | { | |
d4d50710 CH |
153 | struct iovec iov = { .iov_base = buf, .iov_len = size}; |
154 | struct kiocb kiocb; | |
155 | struct iov_iter iter; | |
156 | ssize_t ret; | |
157 | ||
158 | init_sync_kiocb(&kiocb, file); | |
de4eda9d | 159 | iov_iter_init(&iter, ITER_DEST, &iov, 1, size); |
d4d50710 CH |
160 | |
161 | kiocb.ki_pos = *ppos; | |
162 | ret = seq_read_iter(&kiocb, &iter); | |
163 | *ppos = kiocb.ki_pos; | |
164 | return ret; | |
165 | } | |
166 | EXPORT_SYMBOL(seq_read); | |
167 | ||
168 | /* | |
169 | * Ready-made ->f_op->read_iter() | |
170 | */ | |
171 | ssize_t seq_read_iter(struct kiocb *iocb, struct iov_iter *iter) | |
172 | { | |
173 | struct seq_file *m = iocb->ki_filp->private_data; | |
1da177e4 | 174 | size_t copied = 0; |
1da177e4 LT |
175 | size_t n; |
176 | void *p; | |
177 | int err = 0; | |
178 | ||
4bbf439b AV |
179 | if (!iov_iter_count(iter)) |
180 | return 0; | |
181 | ||
0ac1759a | 182 | mutex_lock(&m->lock); |
8f19d472 | 183 | |
e522751d TM |
184 | /* |
185 | * if request is to read from zero offset, reset iterator to first | |
186 | * record as it might have been already advanced by previous requests | |
187 | */ | |
d4d50710 | 188 | if (iocb->ki_pos == 0) { |
e522751d | 189 | m->index = 0; |
cf5eebae MS |
190 | m->count = 0; |
191 | } | |
e522751d | 192 | |
d4d50710 CH |
193 | /* Don't assume ki_pos is where we left it */ |
194 | if (unlikely(iocb->ki_pos != m->read_pos)) { | |
195 | while ((err = traverse(m, iocb->ki_pos)) == -EAGAIN) | |
8f19d472 EB |
196 | ; |
197 | if (err) { | |
198 | /* With prejudice... */ | |
199 | m->read_pos = 0; | |
8f19d472 EB |
200 | m->index = 0; |
201 | m->count = 0; | |
202 | goto Done; | |
7904ac84 | 203 | } else { |
d4d50710 | 204 | m->read_pos = iocb->ki_pos; |
8f19d472 EB |
205 | } |
206 | } | |
207 | ||
1da177e4 LT |
208 | /* grab buffer if we didn't have one */ |
209 | if (!m->buf) { | |
058504ed | 210 | m->buf = seq_buf_alloc(m->size = PAGE_SIZE); |
1da177e4 LT |
211 | if (!m->buf) |
212 | goto Enomem; | |
213 | } | |
4bbf439b | 214 | // something left in the buffer - copy it out first |
1da177e4 | 215 | if (m->count) { |
4bbf439b | 216 | n = copy_to_iter(m->buf + m->from, m->count, iter); |
1da177e4 LT |
217 | m->count -= n; |
218 | m->from += n; | |
1da177e4 | 219 | copied += n; |
4bbf439b | 220 | if (m->count) // hadn't managed to copy everything |
1da177e4 LT |
221 | goto Done; |
222 | } | |
4bbf439b | 223 | // get a non-empty record in the buffer |
1f4aace6 N |
224 | m->from = 0; |
225 | p = m->op->start(m, &m->index); | |
1da177e4 | 226 | while (1) { |
1da177e4 | 227 | err = PTR_ERR(p); |
4bbf439b | 228 | if (!p || IS_ERR(p)) // EOF or an error |
1da177e4 LT |
229 | break; |
230 | err = m->op->show(m, p); | |
4bbf439b | 231 | if (err < 0) // hard error |
1da177e4 | 232 | break; |
4bbf439b | 233 | if (unlikely(err)) // ->show() says "skip it" |
521b5d0c | 234 | m->count = 0; |
4bbf439b | 235 | if (unlikely(!m->count)) { // empty record |
1f4aace6 | 236 | p = m->op->next(m, p, &m->index); |
4cdfe84b AV |
237 | continue; |
238 | } | |
4bbf439b | 239 | if (!seq_has_overflowed(m)) // got it |
1da177e4 | 240 | goto Fill; |
4bbf439b | 241 | // need a bigger buffer |
1da177e4 | 242 | m->op->stop(m, p); |
058504ed | 243 | kvfree(m->buf); |
801a7605 | 244 | m->count = 0; |
058504ed | 245 | m->buf = seq_buf_alloc(m->size <<= 1); |
1da177e4 LT |
246 | if (!m->buf) |
247 | goto Enomem; | |
1f4aace6 | 248 | p = m->op->start(m, &m->index); |
1da177e4 | 249 | } |
4bbf439b | 250 | // EOF or an error |
1da177e4 LT |
251 | m->op->stop(m, p); |
252 | m->count = 0; | |
253 | goto Done; | |
254 | Fill: | |
4bbf439b AV |
255 | // one non-empty record is in the buffer; if they want more, |
256 | // try to fit more in, but in any case we need to advance | |
257 | // the iterator once for every record shown. | |
1f4aace6 | 258 | while (1) { |
1da177e4 | 259 | size_t offs = m->count; |
1f4aace6 N |
260 | loff_t pos = m->index; |
261 | ||
262 | p = m->op->next(m, p, &m->index); | |
3bfa7e14 | 263 | if (pos == m->index) { |
a3963015 JP |
264 | pr_info_ratelimited("buggy .next function %ps did not update position index\n", |
265 | m->op->next); | |
1f4aace6 | 266 | m->index++; |
3bfa7e14 | 267 | } |
4bbf439b | 268 | if (!p || IS_ERR(p)) // no next record for us |
1da177e4 | 269 | break; |
4bbf439b | 270 | if (m->count >= iov_iter_count(iter)) |
1f4aace6 | 271 | break; |
1da177e4 | 272 | err = m->op->show(m, p); |
4bbf439b | 273 | if (err > 0) { // ->show() says "skip it" |
1da177e4 | 274 | m->count = offs; |
4bbf439b AV |
275 | } else if (err || seq_has_overflowed(m)) { |
276 | m->count = offs; | |
277 | break; | |
1da177e4 | 278 | } |
1da177e4 LT |
279 | } |
280 | m->op->stop(m, p); | |
4bbf439b | 281 | n = copy_to_iter(m->buf, m->count, iter); |
1da177e4 LT |
282 | copied += n; |
283 | m->count -= n; | |
1f4aace6 | 284 | m->from = n; |
1da177e4 | 285 | Done: |
4bbf439b AV |
286 | if (unlikely(!copied)) { |
287 | copied = m->count ? -EFAULT : err; | |
288 | } else { | |
d4d50710 | 289 | iocb->ki_pos += copied; |
8f19d472 EB |
290 | m->read_pos += copied; |
291 | } | |
0ac1759a | 292 | mutex_unlock(&m->lock); |
1da177e4 LT |
293 | return copied; |
294 | Enomem: | |
295 | err = -ENOMEM; | |
296 | goto Done; | |
1da177e4 | 297 | } |
d4d50710 | 298 | EXPORT_SYMBOL(seq_read_iter); |
1da177e4 | 299 | |
1da177e4 LT |
300 | /** |
301 | * seq_lseek - ->llseek() method for sequential files. | |
67be2dd1 MW |
302 | * @file: the file in question |
303 | * @offset: new position | |
254adaa4 | 304 | * @whence: 0 for absolute, 1 for relative position |
1da177e4 LT |
305 | * |
306 | * Ready-made ->f_op->llseek() | |
307 | */ | |
965c8e59 | 308 | loff_t seq_lseek(struct file *file, loff_t offset, int whence) |
1da177e4 | 309 | { |
8209e2f4 | 310 | struct seq_file *m = file->private_data; |
16abef0e | 311 | loff_t retval = -EINVAL; |
1da177e4 | 312 | |
0ac1759a | 313 | mutex_lock(&m->lock); |
965c8e59 | 314 | switch (whence) { |
5e62adef AM |
315 | case SEEK_CUR: |
316 | offset += file->f_pos; | |
df561f66 | 317 | fallthrough; |
5e62adef AM |
318 | case SEEK_SET: |
319 | if (offset < 0) | |
320 | break; | |
321 | retval = offset; | |
322 | if (offset != m->read_pos) { | |
323 | while ((retval = traverse(m, offset)) == -EAGAIN) | |
324 | ; | |
325 | if (retval) { | |
326 | /* with extreme prejudice... */ | |
327 | file->f_pos = 0; | |
328 | m->read_pos = 0; | |
5e62adef AM |
329 | m->index = 0; |
330 | m->count = 0; | |
331 | } else { | |
332 | m->read_pos = offset; | |
333 | retval = file->f_pos = offset; | |
1da177e4 | 334 | } |
05e16745 GZ |
335 | } else { |
336 | file->f_pos = offset; | |
5e62adef | 337 | } |
1da177e4 | 338 | } |
00c5746d | 339 | mutex_unlock(&m->lock); |
1da177e4 LT |
340 | return retval; |
341 | } | |
342 | EXPORT_SYMBOL(seq_lseek); | |
343 | ||
344 | /** | |
345 | * seq_release - free the structures associated with sequential file. | |
346 | * @file: file in question | |
6131ffaa | 347 | * @inode: its inode |
1da177e4 LT |
348 | * |
349 | * Frees the structures associated with sequential file; can be used | |
350 | * as ->f_op->release() if you don't have private data to destroy. | |
351 | */ | |
352 | int seq_release(struct inode *inode, struct file *file) | |
353 | { | |
8209e2f4 | 354 | struct seq_file *m = file->private_data; |
058504ed | 355 | kvfree(m->buf); |
09652320 | 356 | kmem_cache_free(seq_file_cache, m); |
1da177e4 LT |
357 | return 0; |
358 | } | |
359 | EXPORT_SYMBOL(seq_release); | |
360 | ||
1d31aa17 AS |
361 | /** |
362 | * seq_escape_mem - print data into buffer, escaping some characters | |
363 | * @m: target buffer | |
364 | * @src: source buffer | |
365 | * @len: size of source buffer | |
366 | * @flags: flags to pass to string_escape_mem() | |
367 | * @esc: set of characters that need escaping | |
368 | * | |
369 | * Puts data into buffer, replacing each occurrence of character from | |
370 | * given class (defined by @flags and @esc) with printable escaped sequence. | |
371 | * | |
372 | * Use seq_has_overflowed() to check for errors. | |
373 | */ | |
374 | void seq_escape_mem(struct seq_file *m, const char *src, size_t len, | |
375 | unsigned int flags, const char *esc) | |
376 | { | |
377 | char *buf; | |
378 | size_t size = seq_get_buf(m, &buf); | |
379 | int ret; | |
380 | ||
381 | ret = string_escape_mem(src, len, buf, size, flags, esc); | |
382 | seq_commit(m, ret < size ? ret : -1); | |
383 | } | |
384 | EXPORT_SYMBOL(seq_escape_mem); | |
385 | ||
6798a8ca | 386 | void seq_vprintf(struct seq_file *m, const char *f, va_list args) |
1da177e4 | 387 | { |
1da177e4 LT |
388 | int len; |
389 | ||
390 | if (m->count < m->size) { | |
1da177e4 | 391 | len = vsnprintf(m->buf + m->count, m->size - m->count, f, args); |
1da177e4 LT |
392 | if (m->count + len < m->size) { |
393 | m->count += len; | |
6798a8ca | 394 | return; |
1da177e4 LT |
395 | } |
396 | } | |
e075f591 | 397 | seq_set_overflow(m); |
1da177e4 | 398 | } |
a4808147 SW |
399 | EXPORT_SYMBOL(seq_vprintf); |
400 | ||
6798a8ca | 401 | void seq_printf(struct seq_file *m, const char *f, ...) |
a4808147 | 402 | { |
a4808147 SW |
403 | va_list args; |
404 | ||
405 | va_start(args, f); | |
6798a8ca | 406 | seq_vprintf(m, f, args); |
a4808147 | 407 | va_end(args); |
a4808147 | 408 | } |
1da177e4 LT |
409 | EXPORT_SYMBOL(seq_printf); |
410 | ||
76d6a133 FR |
411 | #ifdef CONFIG_BINARY_PRINTF |
412 | void seq_bprintf(struct seq_file *m, const char *f, const u32 *binary) | |
413 | { | |
414 | int len; | |
415 | ||
416 | if (m->count < m->size) { | |
417 | len = bstr_printf(m->buf + m->count, m->size - m->count, f, | |
418 | binary); | |
419 | if (m->count + len < m->size) { | |
420 | m->count += len; | |
421 | return; | |
422 | } | |
423 | } | |
424 | seq_set_overflow(m); | |
425 | } | |
426 | EXPORT_SYMBOL(seq_bprintf); | |
427 | #endif /* CONFIG_BINARY_PRINTF */ | |
428 | ||
74e2f334 | 429 | /** |
958086d1 TE |
430 | * mangle_path - mangle and copy path to buffer beginning |
431 | * @s: buffer start | |
432 | * @p: beginning of path in above buffer | |
433 | * @esc: set of characters that need escaping | |
74e2f334 TE |
434 | * |
435 | * Copy the path from @p to @s, replacing each occurrence of character from | |
436 | * @esc with usual octal escape. | |
437 | * Returns pointer past last written character in @s, or NULL in case of | |
438 | * failure. | |
439 | */ | |
8c9379e9 | 440 | char *mangle_path(char *s, const char *p, const char *esc) |
6092d048 RP |
441 | { |
442 | while (s <= p) { | |
443 | char c = *p++; | |
444 | if (!c) { | |
445 | return s; | |
446 | } else if (!strchr(esc, c)) { | |
447 | *s++ = c; | |
448 | } else if (s + 4 > p) { | |
449 | break; | |
450 | } else { | |
451 | *s++ = '\\'; | |
452 | *s++ = '0' + ((c & 0300) >> 6); | |
453 | *s++ = '0' + ((c & 070) >> 3); | |
454 | *s++ = '0' + (c & 07); | |
455 | } | |
456 | } | |
457 | return NULL; | |
458 | } | |
604094f4 | 459 | EXPORT_SYMBOL(mangle_path); |
6092d048 | 460 | |
52afeefb AV |
461 | /** |
462 | * seq_path - seq_file interface to print a pathname | |
463 | * @m: the seq_file handle | |
464 | * @path: the struct path to print | |
465 | * @esc: set of characters to escape in the output | |
466 | * | |
467 | * return the absolute path of 'path', as represented by the | |
468 | * dentry / mnt pair in the path parameter. | |
6092d048 | 469 | */ |
8c9379e9 | 470 | int seq_path(struct seq_file *m, const struct path *path, const char *esc) |
1da177e4 | 471 | { |
f8439806 MS |
472 | char *buf; |
473 | size_t size = seq_get_buf(m, &buf); | |
474 | int res = -1; | |
475 | ||
476 | if (size) { | |
477 | char *p = d_path(path, buf, size); | |
1da177e4 | 478 | if (!IS_ERR(p)) { |
f8439806 MS |
479 | char *end = mangle_path(buf, p, esc); |
480 | if (end) | |
481 | res = end - buf; | |
1da177e4 LT |
482 | } |
483 | } | |
f8439806 MS |
484 | seq_commit(m, res); |
485 | ||
486 | return res; | |
1da177e4 LT |
487 | } |
488 | EXPORT_SYMBOL(seq_path); | |
489 | ||
2726d566 MS |
490 | /** |
491 | * seq_file_path - seq_file interface to print a pathname of a file | |
492 | * @m: the seq_file handle | |
493 | * @file: the struct file to print | |
494 | * @esc: set of characters to escape in the output | |
495 | * | |
496 | * return the absolute path to the file. | |
497 | */ | |
498 | int seq_file_path(struct seq_file *m, struct file *file, const char *esc) | |
499 | { | |
500 | return seq_path(m, &file->f_path, esc); | |
501 | } | |
502 | EXPORT_SYMBOL(seq_file_path); | |
503 | ||
9d1bc601 MS |
504 | /* |
505 | * Same as seq_path, but relative to supplied root. | |
9d1bc601 | 506 | */ |
8c9379e9 AV |
507 | int seq_path_root(struct seq_file *m, const struct path *path, |
508 | const struct path *root, const char *esc) | |
9d1bc601 | 509 | { |
f8439806 MS |
510 | char *buf; |
511 | size_t size = seq_get_buf(m, &buf); | |
512 | int res = -ENAMETOOLONG; | |
513 | ||
514 | if (size) { | |
9d1bc601 MS |
515 | char *p; |
516 | ||
f8439806 | 517 | p = __d_path(path, root, buf, size); |
02125a82 AV |
518 | if (!p) |
519 | return SEQ_SKIP; | |
f8439806 | 520 | res = PTR_ERR(p); |
9d1bc601 | 521 | if (!IS_ERR(p)) { |
f8439806 MS |
522 | char *end = mangle_path(buf, p, esc); |
523 | if (end) | |
524 | res = end - buf; | |
525 | else | |
526 | res = -ENAMETOOLONG; | |
9d1bc601 MS |
527 | } |
528 | } | |
f8439806 MS |
529 | seq_commit(m, res); |
530 | ||
02125a82 | 531 | return res < 0 && res != -ENAMETOOLONG ? res : 0; |
9d1bc601 MS |
532 | } |
533 | ||
6092d048 RP |
534 | /* |
535 | * returns the path of the 'dentry' from the root of its filesystem. | |
536 | */ | |
8c9379e9 | 537 | int seq_dentry(struct seq_file *m, struct dentry *dentry, const char *esc) |
6092d048 | 538 | { |
f8439806 MS |
539 | char *buf; |
540 | size_t size = seq_get_buf(m, &buf); | |
541 | int res = -1; | |
542 | ||
543 | if (size) { | |
544 | char *p = dentry_path(dentry, buf, size); | |
6092d048 | 545 | if (!IS_ERR(p)) { |
f8439806 MS |
546 | char *end = mangle_path(buf, p, esc); |
547 | if (end) | |
548 | res = end - buf; | |
6092d048 RP |
549 | } |
550 | } | |
f8439806 MS |
551 | seq_commit(m, res); |
552 | ||
553 | return res; | |
6092d048 | 554 | } |
c8d3fe02 | 555 | EXPORT_SYMBOL(seq_dentry); |
6092d048 | 556 | |
90b2433e | 557 | void *single_start(struct seq_file *p, loff_t *pos) |
1da177e4 | 558 | { |
90b2433e | 559 | return *pos ? NULL : SEQ_START_TOKEN; |
1da177e4 LT |
560 | } |
561 | ||
562 | static void *single_next(struct seq_file *p, void *v, loff_t *pos) | |
563 | { | |
564 | ++*pos; | |
565 | return NULL; | |
566 | } | |
567 | ||
568 | static void single_stop(struct seq_file *p, void *v) | |
569 | { | |
570 | } | |
571 | ||
572 | int single_open(struct file *file, int (*show)(struct seq_file *, void *), | |
573 | void *data) | |
574 | { | |
d64d01a1 | 575 | struct seq_operations *op = kmalloc(sizeof(*op), GFP_KERNEL_ACCOUNT); |
1da177e4 LT |
576 | int res = -ENOMEM; |
577 | ||
578 | if (op) { | |
579 | op->start = single_start; | |
580 | op->next = single_next; | |
581 | op->stop = single_stop; | |
582 | op->show = show; | |
583 | res = seq_open(file, op); | |
584 | if (!res) | |
585 | ((struct seq_file *)file->private_data)->private = data; | |
586 | else | |
587 | kfree(op); | |
588 | } | |
589 | return res; | |
590 | } | |
591 | EXPORT_SYMBOL(single_open); | |
592 | ||
2043f495 AV |
593 | int single_open_size(struct file *file, int (*show)(struct seq_file *, void *), |
594 | void *data, size_t size) | |
595 | { | |
058504ed | 596 | char *buf = seq_buf_alloc(size); |
2043f495 AV |
597 | int ret; |
598 | if (!buf) | |
599 | return -ENOMEM; | |
600 | ret = single_open(file, show, data); | |
601 | if (ret) { | |
058504ed | 602 | kvfree(buf); |
2043f495 AV |
603 | return ret; |
604 | } | |
605 | ((struct seq_file *)file->private_data)->buf = buf; | |
606 | ((struct seq_file *)file->private_data)->size = size; | |
607 | return 0; | |
608 | } | |
609 | EXPORT_SYMBOL(single_open_size); | |
610 | ||
1da177e4 LT |
611 | int single_release(struct inode *inode, struct file *file) |
612 | { | |
15ad7cdc | 613 | const struct seq_operations *op = ((struct seq_file *)file->private_data)->op; |
1da177e4 LT |
614 | int res = seq_release(inode, file); |
615 | kfree(op); | |
616 | return res; | |
617 | } | |
618 | EXPORT_SYMBOL(single_release); | |
619 | ||
620 | int seq_release_private(struct inode *inode, struct file *file) | |
621 | { | |
622 | struct seq_file *seq = file->private_data; | |
623 | ||
624 | kfree(seq->private); | |
625 | seq->private = NULL; | |
626 | return seq_release(inode, file); | |
627 | } | |
628 | EXPORT_SYMBOL(seq_release_private); | |
629 | ||
39699037 PE |
630 | void *__seq_open_private(struct file *f, const struct seq_operations *ops, |
631 | int psize) | |
632 | { | |
633 | int rc; | |
634 | void *private; | |
635 | struct seq_file *seq; | |
636 | ||
d64d01a1 | 637 | private = kzalloc(psize, GFP_KERNEL_ACCOUNT); |
39699037 PE |
638 | if (private == NULL) |
639 | goto out; | |
640 | ||
641 | rc = seq_open(f, ops); | |
642 | if (rc < 0) | |
643 | goto out_free; | |
644 | ||
645 | seq = f->private_data; | |
646 | seq->private = private; | |
647 | return private; | |
648 | ||
649 | out_free: | |
650 | kfree(private); | |
651 | out: | |
652 | return NULL; | |
653 | } | |
654 | EXPORT_SYMBOL(__seq_open_private); | |
655 | ||
656 | int seq_open_private(struct file *filp, const struct seq_operations *ops, | |
657 | int psize) | |
658 | { | |
659 | return __seq_open_private(filp, ops, psize) ? 0 : -ENOMEM; | |
660 | } | |
661 | EXPORT_SYMBOL(seq_open_private); | |
662 | ||
6798a8ca | 663 | void seq_putc(struct seq_file *m, char c) |
1da177e4 | 664 | { |
6798a8ca JP |
665 | if (m->count >= m->size) |
666 | return; | |
667 | ||
668 | m->buf[m->count++] = c; | |
1da177e4 LT |
669 | } |
670 | EXPORT_SYMBOL(seq_putc); | |
671 | ||
45751097 | 672 | void __seq_puts(struct seq_file *m, const char *s) |
1da177e4 | 673 | { |
e035af9f | 674 | seq_write(m, s, strlen(s)); |
1da177e4 | 675 | } |
45751097 | 676 | EXPORT_SYMBOL(__seq_puts); |
bcf67e16 | 677 | |
d1be35cb | 678 | /** |
961f3c89 MCC |
679 | * seq_put_decimal_ull_width - A helper routine for putting decimal numbers |
680 | * without rich format of printf(). | |
1ac101a5 | 681 | * only 'unsigned long long' is supported. |
d1be35cb AV |
682 | * @m: seq_file identifying the buffer to which data should be written |
683 | * @delimiter: a string which is printed before the number | |
684 | * @num: the number | |
685 | * @width: a minimum field width | |
686 | * | |
687 | * This routine will put strlen(delimiter) + number into seq_filed. | |
1ac101a5 KH |
688 | * This routine is very quick when you show lots of numbers. |
689 | * In usual cases, it will be better to use seq_printf(). It's easier to read. | |
690 | */ | |
d1be35cb AV |
691 | void seq_put_decimal_ull_width(struct seq_file *m, const char *delimiter, |
692 | unsigned long long num, unsigned int width) | |
1ac101a5 KH |
693 | { |
694 | int len; | |
695 | ||
696 | if (m->count + 2 >= m->size) /* we'll write 2 bytes at least */ | |
697 | goto overflow; | |
698 | ||
48dffbf8 AV |
699 | if (delimiter && delimiter[0]) { |
700 | if (delimiter[1] == 0) | |
701 | seq_putc(m, delimiter[0]); | |
702 | else | |
703 | seq_puts(m, delimiter); | |
704 | } | |
75ba1d07 | 705 | |
d1be35cb AV |
706 | if (!width) |
707 | width = 1; | |
708 | ||
709 | if (m->count + width >= m->size) | |
75ba1d07 | 710 | goto overflow; |
1ac101a5 | 711 | |
d1be35cb | 712 | len = num_to_str(m->buf + m->count, m->size - m->count, num, width); |
1ac101a5 KH |
713 | if (!len) |
714 | goto overflow; | |
75ba1d07 | 715 | |
1ac101a5 | 716 | m->count += len; |
6798a8ca JP |
717 | return; |
718 | ||
1ac101a5 | 719 | overflow: |
e075f591 | 720 | seq_set_overflow(m); |
1ac101a5 | 721 | } |
d1be35cb AV |
722 | |
723 | void seq_put_decimal_ull(struct seq_file *m, const char *delimiter, | |
724 | unsigned long long num) | |
725 | { | |
726 | return seq_put_decimal_ull_width(m, delimiter, num, 0); | |
727 | } | |
1ac101a5 KH |
728 | EXPORT_SYMBOL(seq_put_decimal_ull); |
729 | ||
0e3dc019 AV |
730 | /** |
731 | * seq_put_hex_ll - put a number in hexadecimal notation | |
732 | * @m: seq_file identifying the buffer to which data should be written | |
733 | * @delimiter: a string which is printed before the number | |
734 | * @v: the number | |
735 | * @width: a minimum field width | |
736 | * | |
737 | * seq_put_hex_ll(m, "", v, 8) is equal to seq_printf(m, "%08llx", v) | |
738 | * | |
739 | * This routine is very quick when you show lots of numbers. | |
740 | * In usual cases, it will be better to use seq_printf(). It's easier to read. | |
741 | */ | |
742 | void seq_put_hex_ll(struct seq_file *m, const char *delimiter, | |
743 | unsigned long long v, unsigned int width) | |
744 | { | |
745 | unsigned int len; | |
746 | int i; | |
747 | ||
748 | if (delimiter && delimiter[0]) { | |
749 | if (delimiter[1] == 0) | |
750 | seq_putc(m, delimiter[0]); | |
751 | else | |
752 | seq_puts(m, delimiter); | |
753 | } | |
754 | ||
755 | /* If x is 0, the result of __builtin_clzll is undefined */ | |
756 | if (v == 0) | |
757 | len = 1; | |
758 | else | |
759 | len = (sizeof(v) * 8 - __builtin_clzll(v) + 3) / 4; | |
760 | ||
761 | if (len < width) | |
762 | len = width; | |
763 | ||
764 | if (m->count + len > m->size) { | |
765 | seq_set_overflow(m); | |
766 | return; | |
767 | } | |
768 | ||
769 | for (i = len - 1; i >= 0; i--) { | |
770 | m->buf[m->count + i] = hex_asc[0xf & v]; | |
771 | v = v >> 4; | |
772 | } | |
773 | m->count += len; | |
774 | } | |
775 | ||
75ba1d07 | 776 | void seq_put_decimal_ll(struct seq_file *m, const char *delimiter, long long num) |
bda7bad6 | 777 | { |
75ba1d07 JP |
778 | int len; |
779 | ||
780 | if (m->count + 3 >= m->size) /* we'll write 2 bytes at least */ | |
781 | goto overflow; | |
782 | ||
48dffbf8 AV |
783 | if (delimiter && delimiter[0]) { |
784 | if (delimiter[1] == 0) | |
785 | seq_putc(m, delimiter[0]); | |
786 | else | |
787 | seq_puts(m, delimiter); | |
788 | } | |
75ba1d07 JP |
789 | |
790 | if (m->count + 2 >= m->size) | |
791 | goto overflow; | |
792 | ||
bda7bad6 | 793 | if (num < 0) { |
75ba1d07 | 794 | m->buf[m->count++] = '-'; |
bda7bad6 | 795 | num = -num; |
bda7bad6 | 796 | } |
75ba1d07 JP |
797 | |
798 | if (num < 10) { | |
799 | m->buf[m->count++] = num + '0'; | |
800 | return; | |
801 | } | |
802 | ||
d1be35cb | 803 | len = num_to_str(m->buf + m->count, m->size - m->count, num, 0); |
75ba1d07 JP |
804 | if (!len) |
805 | goto overflow; | |
806 | ||
807 | m->count += len; | |
808 | return; | |
809 | ||
810 | overflow: | |
811 | seq_set_overflow(m); | |
bda7bad6 KH |
812 | } |
813 | EXPORT_SYMBOL(seq_put_decimal_ll); | |
814 | ||
0b923606 PO |
815 | /** |
816 | * seq_write - write arbitrary data to buffer | |
817 | * @seq: seq_file identifying the buffer to which data should be written | |
818 | * @data: data address | |
819 | * @len: number of bytes | |
820 | * | |
821 | * Return 0 on success, non-zero otherwise. | |
822 | */ | |
823 | int seq_write(struct seq_file *seq, const void *data, size_t len) | |
824 | { | |
825 | if (seq->count + len < seq->size) { | |
826 | memcpy(seq->buf + seq->count, data, len); | |
827 | seq->count += len; | |
828 | return 0; | |
829 | } | |
e075f591 | 830 | seq_set_overflow(seq); |
0b923606 PO |
831 | return -1; |
832 | } | |
833 | EXPORT_SYMBOL(seq_write); | |
834 | ||
839cc2a9 TH |
835 | /** |
836 | * seq_pad - write padding spaces to buffer | |
837 | * @m: seq_file identifying the buffer to which data should be written | |
838 | * @c: the byte to append after padding if non-zero | |
839 | */ | |
840 | void seq_pad(struct seq_file *m, char c) | |
841 | { | |
842 | int size = m->pad_until - m->count; | |
8cfa67b4 AV |
843 | if (size > 0) { |
844 | if (size + m->count > m->size) { | |
845 | seq_set_overflow(m); | |
846 | return; | |
847 | } | |
848 | memset(m->buf + m->count, ' ', size); | |
849 | m->count += size; | |
850 | } | |
839cc2a9 TH |
851 | if (c) |
852 | seq_putc(m, c); | |
853 | } | |
854 | EXPORT_SYMBOL(seq_pad); | |
855 | ||
37607102 AS |
856 | /* A complete analogue of print_hex_dump() */ |
857 | void seq_hex_dump(struct seq_file *m, const char *prefix_str, int prefix_type, | |
858 | int rowsize, int groupsize, const void *buf, size_t len, | |
859 | bool ascii) | |
860 | { | |
861 | const u8 *ptr = buf; | |
862 | int i, linelen, remaining = len; | |
8b91a318 AS |
863 | char *buffer; |
864 | size_t size; | |
37607102 AS |
865 | int ret; |
866 | ||
867 | if (rowsize != 16 && rowsize != 32) | |
868 | rowsize = 16; | |
869 | ||
870 | for (i = 0; i < len && !seq_has_overflowed(m); i += rowsize) { | |
871 | linelen = min(remaining, rowsize); | |
872 | remaining -= rowsize; | |
873 | ||
874 | switch (prefix_type) { | |
875 | case DUMP_PREFIX_ADDRESS: | |
876 | seq_printf(m, "%s%p: ", prefix_str, ptr + i); | |
877 | break; | |
878 | case DUMP_PREFIX_OFFSET: | |
879 | seq_printf(m, "%s%.8x: ", prefix_str, i); | |
880 | break; | |
881 | default: | |
882 | seq_printf(m, "%s", prefix_str); | |
883 | break; | |
884 | } | |
885 | ||
8b91a318 | 886 | size = seq_get_buf(m, &buffer); |
37607102 | 887 | ret = hex_dump_to_buffer(ptr + i, linelen, rowsize, groupsize, |
8b91a318 AS |
888 | buffer, size, ascii); |
889 | seq_commit(m, ret < size ? ret : -1); | |
890 | ||
891 | seq_putc(m, '\n'); | |
37607102 AS |
892 | } |
893 | } | |
894 | EXPORT_SYMBOL(seq_hex_dump); | |
895 | ||
bcf67e16 PE |
896 | struct list_head *seq_list_start(struct list_head *head, loff_t pos) |
897 | { | |
898 | struct list_head *lh; | |
899 | ||
900 | list_for_each(lh, head) | |
901 | if (pos-- == 0) | |
902 | return lh; | |
903 | ||
904 | return NULL; | |
905 | } | |
bcf67e16 PE |
906 | EXPORT_SYMBOL(seq_list_start); |
907 | ||
908 | struct list_head *seq_list_start_head(struct list_head *head, loff_t pos) | |
909 | { | |
910 | if (!pos) | |
911 | return head; | |
912 | ||
913 | return seq_list_start(head, pos - 1); | |
914 | } | |
bcf67e16 PE |
915 | EXPORT_SYMBOL(seq_list_start_head); |
916 | ||
917 | struct list_head *seq_list_next(void *v, struct list_head *head, loff_t *ppos) | |
918 | { | |
919 | struct list_head *lh; | |
920 | ||
921 | lh = ((struct list_head *)v)->next; | |
922 | ++*ppos; | |
923 | return lh == head ? NULL : lh; | |
924 | } | |
bcf67e16 | 925 | EXPORT_SYMBOL(seq_list_next); |
66655de6 | 926 | |
ad25f5cb DH |
927 | struct list_head *seq_list_start_rcu(struct list_head *head, loff_t pos) |
928 | { | |
929 | struct list_head *lh; | |
930 | ||
931 | list_for_each_rcu(lh, head) | |
932 | if (pos-- == 0) | |
933 | return lh; | |
934 | ||
935 | return NULL; | |
936 | } | |
937 | EXPORT_SYMBOL(seq_list_start_rcu); | |
938 | ||
939 | struct list_head *seq_list_start_head_rcu(struct list_head *head, loff_t pos) | |
940 | { | |
941 | if (!pos) | |
942 | return head; | |
943 | ||
944 | return seq_list_start_rcu(head, pos - 1); | |
945 | } | |
946 | EXPORT_SYMBOL(seq_list_start_head_rcu); | |
947 | ||
948 | struct list_head *seq_list_next_rcu(void *v, struct list_head *head, | |
949 | loff_t *ppos) | |
950 | { | |
951 | struct list_head *lh; | |
952 | ||
953 | lh = list_next_rcu((struct list_head *)v); | |
954 | ++*ppos; | |
955 | return lh == head ? NULL : lh; | |
956 | } | |
957 | EXPORT_SYMBOL(seq_list_next_rcu); | |
958 | ||
66655de6 LZ |
959 | /** |
960 | * seq_hlist_start - start an iteration of a hlist | |
961 | * @head: the head of the hlist | |
962 | * @pos: the start position of the sequence | |
963 | * | |
964 | * Called at seq_file->op->start(). | |
965 | */ | |
966 | struct hlist_node *seq_hlist_start(struct hlist_head *head, loff_t pos) | |
967 | { | |
968 | struct hlist_node *node; | |
969 | ||
970 | hlist_for_each(node, head) | |
971 | if (pos-- == 0) | |
972 | return node; | |
973 | return NULL; | |
974 | } | |
975 | EXPORT_SYMBOL(seq_hlist_start); | |
976 | ||
977 | /** | |
978 | * seq_hlist_start_head - start an iteration of a hlist | |
979 | * @head: the head of the hlist | |
980 | * @pos: the start position of the sequence | |
981 | * | |
982 | * Called at seq_file->op->start(). Call this function if you want to | |
983 | * print a header at the top of the output. | |
984 | */ | |
985 | struct hlist_node *seq_hlist_start_head(struct hlist_head *head, loff_t pos) | |
986 | { | |
987 | if (!pos) | |
988 | return SEQ_START_TOKEN; | |
989 | ||
990 | return seq_hlist_start(head, pos - 1); | |
991 | } | |
992 | EXPORT_SYMBOL(seq_hlist_start_head); | |
993 | ||
994 | /** | |
995 | * seq_hlist_next - move to the next position of the hlist | |
996 | * @v: the current iterator | |
997 | * @head: the head of the hlist | |
138860b9 | 998 | * @ppos: the current position |
66655de6 LZ |
999 | * |
1000 | * Called at seq_file->op->next(). | |
1001 | */ | |
1002 | struct hlist_node *seq_hlist_next(void *v, struct hlist_head *head, | |
1003 | loff_t *ppos) | |
1004 | { | |
1005 | struct hlist_node *node = v; | |
1006 | ||
1007 | ++*ppos; | |
1008 | if (v == SEQ_START_TOKEN) | |
1009 | return head->first; | |
1010 | else | |
1011 | return node->next; | |
1012 | } | |
1013 | EXPORT_SYMBOL(seq_hlist_next); | |
1cc52327 | 1014 | |
1015 | /** | |
1016 | * seq_hlist_start_rcu - start an iteration of a hlist protected by RCU | |
1017 | * @head: the head of the hlist | |
1018 | * @pos: the start position of the sequence | |
1019 | * | |
1020 | * Called at seq_file->op->start(). | |
1021 | * | |
1022 | * This list-traversal primitive may safely run concurrently with | |
1023 | * the _rcu list-mutation primitives such as hlist_add_head_rcu() | |
1024 | * as long as the traversal is guarded by rcu_read_lock(). | |
1025 | */ | |
1026 | struct hlist_node *seq_hlist_start_rcu(struct hlist_head *head, | |
1027 | loff_t pos) | |
1028 | { | |
1029 | struct hlist_node *node; | |
1030 | ||
1031 | __hlist_for_each_rcu(node, head) | |
1032 | if (pos-- == 0) | |
1033 | return node; | |
1034 | return NULL; | |
1035 | } | |
1036 | EXPORT_SYMBOL(seq_hlist_start_rcu); | |
1037 | ||
1038 | /** | |
1039 | * seq_hlist_start_head_rcu - start an iteration of a hlist protected by RCU | |
1040 | * @head: the head of the hlist | |
1041 | * @pos: the start position of the sequence | |
1042 | * | |
1043 | * Called at seq_file->op->start(). Call this function if you want to | |
1044 | * print a header at the top of the output. | |
1045 | * | |
1046 | * This list-traversal primitive may safely run concurrently with | |
1047 | * the _rcu list-mutation primitives such as hlist_add_head_rcu() | |
1048 | * as long as the traversal is guarded by rcu_read_lock(). | |
1049 | */ | |
1050 | struct hlist_node *seq_hlist_start_head_rcu(struct hlist_head *head, | |
1051 | loff_t pos) | |
1052 | { | |
1053 | if (!pos) | |
1054 | return SEQ_START_TOKEN; | |
1055 | ||
1056 | return seq_hlist_start_rcu(head, pos - 1); | |
1057 | } | |
1058 | EXPORT_SYMBOL(seq_hlist_start_head_rcu); | |
1059 | ||
1060 | /** | |
1061 | * seq_hlist_next_rcu - move to the next position of the hlist protected by RCU | |
1062 | * @v: the current iterator | |
1063 | * @head: the head of the hlist | |
138860b9 | 1064 | * @ppos: the current position |
1cc52327 | 1065 | * |
1066 | * Called at seq_file->op->next(). | |
1067 | * | |
1068 | * This list-traversal primitive may safely run concurrently with | |
1069 | * the _rcu list-mutation primitives such as hlist_add_head_rcu() | |
1070 | * as long as the traversal is guarded by rcu_read_lock(). | |
1071 | */ | |
1072 | struct hlist_node *seq_hlist_next_rcu(void *v, | |
1073 | struct hlist_head *head, | |
1074 | loff_t *ppos) | |
1075 | { | |
1076 | struct hlist_node *node = v; | |
1077 | ||
1078 | ++*ppos; | |
1079 | if (v == SEQ_START_TOKEN) | |
1080 | return rcu_dereference(head->first); | |
1081 | else | |
1082 | return rcu_dereference(node->next); | |
1083 | } | |
1084 | EXPORT_SYMBOL(seq_hlist_next_rcu); | |
0bc77381 JL |
1085 | |
1086 | /** | |
961f3c89 | 1087 | * seq_hlist_start_percpu - start an iteration of a percpu hlist array |
0bc77381 JL |
1088 | * @head: pointer to percpu array of struct hlist_heads |
1089 | * @cpu: pointer to cpu "cursor" | |
1090 | * @pos: start position of sequence | |
1091 | * | |
1092 | * Called at seq_file->op->start(). | |
1093 | */ | |
1094 | struct hlist_node * | |
1095 | seq_hlist_start_percpu(struct hlist_head __percpu *head, int *cpu, loff_t pos) | |
1096 | { | |
1097 | struct hlist_node *node; | |
1098 | ||
1099 | for_each_possible_cpu(*cpu) { | |
1100 | hlist_for_each(node, per_cpu_ptr(head, *cpu)) { | |
1101 | if (pos-- == 0) | |
1102 | return node; | |
1103 | } | |
1104 | } | |
1105 | return NULL; | |
1106 | } | |
1107 | EXPORT_SYMBOL(seq_hlist_start_percpu); | |
1108 | ||
1109 | /** | |
1110 | * seq_hlist_next_percpu - move to the next position of the percpu hlist array | |
1111 | * @v: pointer to current hlist_node | |
1112 | * @head: pointer to percpu array of struct hlist_heads | |
1113 | * @cpu: pointer to cpu "cursor" | |
1114 | * @pos: start position of sequence | |
1115 | * | |
1116 | * Called at seq_file->op->next(). | |
1117 | */ | |
1118 | struct hlist_node * | |
1119 | seq_hlist_next_percpu(void *v, struct hlist_head __percpu *head, | |
1120 | int *cpu, loff_t *pos) | |
1121 | { | |
1122 | struct hlist_node *node = v; | |
1123 | ||
1124 | ++*pos; | |
1125 | ||
1126 | if (node->next) | |
1127 | return node->next; | |
1128 | ||
1129 | for (*cpu = cpumask_next(*cpu, cpu_possible_mask); *cpu < nr_cpu_ids; | |
1130 | *cpu = cpumask_next(*cpu, cpu_possible_mask)) { | |
1131 | struct hlist_head *bucket = per_cpu_ptr(head, *cpu); | |
1132 | ||
1133 | if (!hlist_empty(bucket)) | |
1134 | return bucket->first; | |
1135 | } | |
1136 | return NULL; | |
1137 | } | |
1138 | EXPORT_SYMBOL(seq_hlist_next_percpu); | |
09652320 AD |
1139 | |
1140 | void __init seq_file_init(void) | |
1141 | { | |
d64d01a1 | 1142 | seq_file_cache = KMEM_CACHE(seq_file, SLAB_ACCOUNT|SLAB_PANIC); |
09652320 | 1143 | } |