1 // SPDX-License-Identifier: GPL-2.0 1 // SPDX-License-Identifier: GPL-2.0
2 /* 2 /*
3 * linux/fs/seq_file.c 3 * linux/fs/seq_file.c
4 * 4 *
5 * helper functions for making synthetic files 5 * helper functions for making synthetic files from sequences of records.
6 * initial implementation -- AV, Oct 2001. 6 * initial implementation -- AV, Oct 2001.
7 */ 7 */
8 8
9 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt <<
10 <<
11 #include <linux/cache.h> 9 #include <linux/cache.h>
12 #include <linux/fs.h> 10 #include <linux/fs.h>
13 #include <linux/export.h> 11 #include <linux/export.h>
14 #include <linux/seq_file.h> 12 #include <linux/seq_file.h>
15 #include <linux/vmalloc.h> 13 #include <linux/vmalloc.h>
16 #include <linux/slab.h> 14 #include <linux/slab.h>
17 #include <linux/cred.h> 15 #include <linux/cred.h>
18 #include <linux/mm.h> 16 #include <linux/mm.h>
19 #include <linux/printk.h> 17 #include <linux/printk.h>
20 #include <linux/string_helpers.h> 18 #include <linux/string_helpers.h>
21 #include <linux/uio.h> <<
22 19
23 #include <linux/uaccess.h> 20 #include <linux/uaccess.h>
24 #include <asm/page.h> 21 #include <asm/page.h>
25 22
26 static struct kmem_cache *seq_file_cache __ro_ 23 static struct kmem_cache *seq_file_cache __ro_after_init;
27 24
28 static void seq_set_overflow(struct seq_file * 25 static void seq_set_overflow(struct seq_file *m)
29 { 26 {
30 m->count = m->size; 27 m->count = m->size;
31 } 28 }
32 29
33 static void *seq_buf_alloc(unsigned long size) 30 static void *seq_buf_alloc(unsigned long size)
34 { 31 {
35 if (unlikely(size > MAX_RW_COUNT)) 32 if (unlikely(size > MAX_RW_COUNT))
36 return NULL; 33 return NULL;
37 34
38 return kvmalloc(size, GFP_KERNEL_ACCOU 35 return kvmalloc(size, GFP_KERNEL_ACCOUNT);
39 } 36 }
40 37
41 /** 38 /**
42 * seq_open - initialize sequential 39 * seq_open - initialize sequential file
43 * @file: file we initialize 40 * @file: file we initialize
44 * @op: method table describing the seque 41 * @op: method table describing the sequence
45 * 42 *
46 * seq_open() sets @file, associating it 43 * seq_open() sets @file, associating it with a sequence described
47 * by @op. @op->start() sets the iterato 44 * by @op. @op->start() sets the iterator up and returns the first
48 * element of sequence. @op->stop() shuts 45 * element of sequence. @op->stop() shuts it down. @op->next()
49 * returns the next element of sequence. 46 * returns the next element of sequence. @op->show() prints element
50 * into the buffer. In case of error ->s 47 * into the buffer. In case of error ->start() and ->next() return
51 * ERR_PTR(error). In the end of sequenc 48 * ERR_PTR(error). In the end of sequence they return %NULL. ->show()
52 * returns 0 in case of success and negat 49 * returns 0 in case of success and negative number in case of error.
53 * Returning SEQ_SKIP means "discard this 50 * Returning SEQ_SKIP means "discard this element and move on".
54 * Note: seq_open() will allocate a struc 51 * Note: seq_open() will allocate a struct seq_file and store its
55 * pointer in @file->private_data. This p 52 * pointer in @file->private_data. This pointer should not be modified.
56 */ 53 */
57 int seq_open(struct file *file, const struct s 54 int seq_open(struct file *file, const struct seq_operations *op)
58 { 55 {
59 struct seq_file *p; 56 struct seq_file *p;
60 57
61 WARN_ON(file->private_data); 58 WARN_ON(file->private_data);
62 59
63 p = kmem_cache_zalloc(seq_file_cache, 60 p = kmem_cache_zalloc(seq_file_cache, GFP_KERNEL);
64 if (!p) 61 if (!p)
65 return -ENOMEM; 62 return -ENOMEM;
66 63
67 file->private_data = p; 64 file->private_data = p;
68 65
69 mutex_init(&p->lock); 66 mutex_init(&p->lock);
70 p->op = op; 67 p->op = op;
71 68
72 // No refcounting: the lifetime of 'p' 69 // No refcounting: the lifetime of 'p' is constrained
73 // to the lifetime of the file. 70 // to the lifetime of the file.
74 p->file = file; 71 p->file = file;
75 72
76 /* 73 /*
>> 74 * Wrappers around seq_open(e.g. swaps_open) need to be
>> 75 * aware of this. If they set f_version themselves, they
>> 76 * should call seq_open first and then set f_version.
>> 77 */
>> 78 file->f_version = 0;
>> 79
>> 80 /*
77 * seq_files support lseek() and pread 81 * seq_files support lseek() and pread(). They do not implement
78 * write() at all, but we clear FMODE_ 82 * write() at all, but we clear FMODE_PWRITE here for historical
79 * reasons. 83 * reasons.
80 * 84 *
81 * If a client of seq_files a) impleme 85 * If a client of seq_files a) implements file.write() and b) wishes to
82 * support pwrite() then that client w 86 * support pwrite() then that client will need to implement its own
83 * file.open() which calls seq_open() 87 * file.open() which calls seq_open() and then sets FMODE_PWRITE.
84 */ 88 */
85 file->f_mode &= ~FMODE_PWRITE; 89 file->f_mode &= ~FMODE_PWRITE;
86 return 0; 90 return 0;
87 } 91 }
88 EXPORT_SYMBOL(seq_open); 92 EXPORT_SYMBOL(seq_open);
89 93
90 static int traverse(struct seq_file *m, loff_t 94 static int traverse(struct seq_file *m, loff_t offset)
91 { 95 {
92 loff_t pos = 0; 96 loff_t pos = 0;
93 int error = 0; 97 int error = 0;
94 void *p; 98 void *p;
95 99
>> 100 m->version = 0;
96 m->index = 0; 101 m->index = 0;
97 m->count = m->from = 0; 102 m->count = m->from = 0;
98 if (!offset) 103 if (!offset)
99 return 0; 104 return 0;
100 105
101 if (!m->buf) { 106 if (!m->buf) {
102 m->buf = seq_buf_alloc(m->size 107 m->buf = seq_buf_alloc(m->size = PAGE_SIZE);
103 if (!m->buf) 108 if (!m->buf)
104 return -ENOMEM; 109 return -ENOMEM;
105 } 110 }
106 p = m->op->start(m, &m->index); 111 p = m->op->start(m, &m->index);
107 while (p) { 112 while (p) {
108 error = PTR_ERR(p); 113 error = PTR_ERR(p);
109 if (IS_ERR(p)) 114 if (IS_ERR(p))
110 break; 115 break;
111 error = m->op->show(m, p); 116 error = m->op->show(m, p);
112 if (error < 0) 117 if (error < 0)
113 break; 118 break;
114 if (unlikely(error)) { 119 if (unlikely(error)) {
115 error = 0; 120 error = 0;
116 m->count = 0; 121 m->count = 0;
117 } 122 }
118 if (seq_has_overflowed(m)) 123 if (seq_has_overflowed(m))
119 goto Eoverflow; 124 goto Eoverflow;
120 p = m->op->next(m, p, &m->inde 125 p = m->op->next(m, p, &m->index);
121 if (pos + m->count > offset) { 126 if (pos + m->count > offset) {
122 m->from = offset - pos 127 m->from = offset - pos;
123 m->count -= m->from; 128 m->count -= m->from;
124 break; 129 break;
125 } 130 }
126 pos += m->count; 131 pos += m->count;
127 m->count = 0; 132 m->count = 0;
128 if (pos == offset) 133 if (pos == offset)
129 break; 134 break;
130 } 135 }
131 m->op->stop(m, p); 136 m->op->stop(m, p);
132 return error; 137 return error;
133 138
134 Eoverflow: 139 Eoverflow:
135 m->op->stop(m, p); 140 m->op->stop(m, p);
136 kvfree(m->buf); 141 kvfree(m->buf);
137 m->count = 0; 142 m->count = 0;
138 m->buf = seq_buf_alloc(m->size <<= 1); 143 m->buf = seq_buf_alloc(m->size <<= 1);
139 return !m->buf ? -ENOMEM : -EAGAIN; 144 return !m->buf ? -ENOMEM : -EAGAIN;
140 } 145 }
141 146
142 /** 147 /**
143 * seq_read - ->read() method for se 148 * seq_read - ->read() method for sequential files.
144 * @file: the file to read from 149 * @file: the file to read from
145 * @buf: the buffer to read to 150 * @buf: the buffer to read to
146 * @size: the maximum number of bytes to 151 * @size: the maximum number of bytes to read
147 * @ppos: the current position in the fil 152 * @ppos: the current position in the file
148 * 153 *
149 * Ready-made ->f_op->read() 154 * Ready-made ->f_op->read()
150 */ 155 */
151 ssize_t seq_read(struct file *file, char __use 156 ssize_t seq_read(struct file *file, char __user *buf, size_t size, loff_t *ppos)
152 { 157 {
153 struct iovec iov = { .iov_base = buf, !! 158 struct seq_file *m = file->private_data;
154 struct kiocb kiocb; <<
155 struct iov_iter iter; <<
156 ssize_t ret; <<
157 <<
158 init_sync_kiocb(&kiocb, file); <<
159 iov_iter_init(&iter, ITER_DEST, &iov, <<
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, stru <<
172 { <<
173 struct seq_file *m = iocb->ki_filp->pr <<
174 size_t copied = 0; 159 size_t copied = 0;
175 size_t n; 160 size_t n;
176 void *p; 161 void *p;
177 int err = 0; 162 int err = 0;
178 163
179 if (!iov_iter_count(iter)) <<
180 return 0; <<
181 <<
182 mutex_lock(&m->lock); 164 mutex_lock(&m->lock);
183 165
184 /* 166 /*
>> 167 * seq_file->op->..m_start/m_stop/m_next may do special actions
>> 168 * or optimisations based on the file->f_version, so we want to
>> 169 * pass the file->f_version to those methods.
>> 170 *
>> 171 * seq_file->version is just copy of f_version, and seq_file
>> 172 * methods can treat it simply as file version.
>> 173 * It is copied in first and copied out after all operations.
>> 174 * It is convenient to have it as part of structure to avoid the
>> 175 * need of passing another argument to all the seq_file methods.
>> 176 */
>> 177 m->version = file->f_version;
>> 178
>> 179 /*
185 * if request is to read from zero off 180 * if request is to read from zero offset, reset iterator to first
186 * record as it might have been alread 181 * record as it might have been already advanced by previous requests
187 */ 182 */
188 if (iocb->ki_pos == 0) { !! 183 if (*ppos == 0) {
189 m->index = 0; 184 m->index = 0;
>> 185 m->version = 0;
190 m->count = 0; 186 m->count = 0;
191 } 187 }
192 188
193 /* Don't assume ki_pos is where we lef !! 189 /* Don't assume *ppos is where we left it */
194 if (unlikely(iocb->ki_pos != m->read_p !! 190 if (unlikely(*ppos != m->read_pos)) {
195 while ((err = traverse(m, iocb !! 191 while ((err = traverse(m, *ppos)) == -EAGAIN)
196 ; 192 ;
197 if (err) { 193 if (err) {
198 /* With prejudice... * 194 /* With prejudice... */
199 m->read_pos = 0; 195 m->read_pos = 0;
>> 196 m->version = 0;
200 m->index = 0; 197 m->index = 0;
201 m->count = 0; 198 m->count = 0;
202 goto Done; 199 goto Done;
203 } else { 200 } else {
204 m->read_pos = iocb->ki !! 201 m->read_pos = *ppos;
205 } 202 }
206 } 203 }
207 204
208 /* grab buffer if we didn't have one * 205 /* grab buffer if we didn't have one */
209 if (!m->buf) { 206 if (!m->buf) {
210 m->buf = seq_buf_alloc(m->size 207 m->buf = seq_buf_alloc(m->size = PAGE_SIZE);
211 if (!m->buf) 208 if (!m->buf)
212 goto Enomem; 209 goto Enomem;
213 } 210 }
214 // something left in the buffer - copy !! 211 /* if not empty - flush it first */
215 if (m->count) { 212 if (m->count) {
216 n = copy_to_iter(m->buf + m->f !! 213 n = min(m->count, size);
>> 214 err = copy_to_user(buf, m->buf + m->from, n);
>> 215 if (err)
>> 216 goto Efault;
217 m->count -= n; 217 m->count -= n;
218 m->from += n; 218 m->from += n;
>> 219 size -= n;
>> 220 buf += n;
219 copied += n; 221 copied += n;
220 if (m->count) // hadn't mana !! 222 if (!size)
221 goto Done; 223 goto Done;
222 } 224 }
223 // get a non-empty record in the buffe !! 225 /* we need at least one record in buffer */
224 m->from = 0; 226 m->from = 0;
225 p = m->op->start(m, &m->index); 227 p = m->op->start(m, &m->index);
226 while (1) { 228 while (1) {
227 err = PTR_ERR(p); 229 err = PTR_ERR(p);
228 if (!p || IS_ERR(p)) // EOF !! 230 if (!p || IS_ERR(p))
229 break; 231 break;
230 err = m->op->show(m, p); 232 err = m->op->show(m, p);
231 if (err < 0) // har !! 233 if (err < 0)
232 break; 234 break;
233 if (unlikely(err)) // ->s !! 235 if (unlikely(err))
234 m->count = 0; 236 m->count = 0;
235 if (unlikely(!m->count)) { // !! 237 if (unlikely(!m->count)) {
236 p = m->op->next(m, p, 238 p = m->op->next(m, p, &m->index);
237 continue; 239 continue;
238 } 240 }
239 if (!seq_has_overflowed(m)) // !! 241 if (m->count < m->size)
240 goto Fill; 242 goto Fill;
241 // need a bigger buffer <<
242 m->op->stop(m, p); 243 m->op->stop(m, p);
243 kvfree(m->buf); 244 kvfree(m->buf);
244 m->count = 0; 245 m->count = 0;
245 m->buf = seq_buf_alloc(m->size 246 m->buf = seq_buf_alloc(m->size <<= 1);
246 if (!m->buf) 247 if (!m->buf)
247 goto Enomem; 248 goto Enomem;
>> 249 m->version = 0;
248 p = m->op->start(m, &m->index) 250 p = m->op->start(m, &m->index);
249 } 251 }
250 // EOF or an error <<
251 m->op->stop(m, p); 252 m->op->stop(m, p);
252 m->count = 0; 253 m->count = 0;
253 goto Done; 254 goto Done;
254 Fill: 255 Fill:
255 // one non-empty record is in the buff !! 256 /* they want more? let's try to get some more */
256 // try to fit more in, but in any case <<
257 // the iterator once for every record <<
258 while (1) { 257 while (1) {
259 size_t offs = m->count; 258 size_t offs = m->count;
260 loff_t pos = m->index; 259 loff_t pos = m->index;
261 260
262 p = m->op->next(m, p, &m->inde 261 p = m->op->next(m, p, &m->index);
263 if (pos == m->index) { !! 262 if (pos == m->index)
264 pr_info_ratelimited("b !! 263 /* Buggy ->next function */
265 m- <<
266 m->index++; 264 m->index++;
267 } !! 265 if (!p || IS_ERR(p)) {
268 if (!p || IS_ERR(p)) // no !! 266 err = PTR_ERR(p);
269 break; 267 break;
270 if (m->count >= iov_iter_count !! 268 }
>> 269 if (m->count >= size)
271 break; 270 break;
272 err = m->op->show(m, p); 271 err = m->op->show(m, p);
273 if (err > 0) { // ->s !! 272 if (seq_has_overflowed(m) || err) {
274 m->count = offs; <<
275 } else if (err || seq_has_over <<
276 m->count = offs; 273 m->count = offs;
277 break; !! 274 if (likely(err <= 0))
>> 275 break;
278 } 276 }
279 } 277 }
280 m->op->stop(m, p); 278 m->op->stop(m, p);
281 n = copy_to_iter(m->buf, m->count, ite !! 279 n = min(m->count, size);
>> 280 err = copy_to_user(buf, m->buf, n);
>> 281 if (err)
>> 282 goto Efault;
282 copied += n; 283 copied += n;
283 m->count -= n; 284 m->count -= n;
284 m->from = n; 285 m->from = n;
285 Done: 286 Done:
286 if (unlikely(!copied)) { !! 287 if (!copied)
287 copied = m->count ? -EFAULT : !! 288 copied = err;
288 } else { !! 289 else {
289 iocb->ki_pos += copied; !! 290 *ppos += copied;
290 m->read_pos += copied; 291 m->read_pos += copied;
291 } 292 }
>> 293 file->f_version = m->version;
292 mutex_unlock(&m->lock); 294 mutex_unlock(&m->lock);
293 return copied; 295 return copied;
294 Enomem: 296 Enomem:
295 err = -ENOMEM; 297 err = -ENOMEM;
296 goto Done; 298 goto Done;
>> 299 Efault:
>> 300 err = -EFAULT;
>> 301 goto Done;
297 } 302 }
298 EXPORT_SYMBOL(seq_read_iter); !! 303 EXPORT_SYMBOL(seq_read);
299 304
300 /** 305 /**
301 * seq_lseek - ->llseek() method for 306 * seq_lseek - ->llseek() method for sequential files.
302 * @file: the file in question 307 * @file: the file in question
303 * @offset: new position 308 * @offset: new position
304 * @whence: 0 for absolute, 1 for relativ 309 * @whence: 0 for absolute, 1 for relative position
305 * 310 *
306 * Ready-made ->f_op->llseek() 311 * Ready-made ->f_op->llseek()
307 */ 312 */
308 loff_t seq_lseek(struct file *file, loff_t off 313 loff_t seq_lseek(struct file *file, loff_t offset, int whence)
309 { 314 {
310 struct seq_file *m = file->private_dat 315 struct seq_file *m = file->private_data;
311 loff_t retval = -EINVAL; 316 loff_t retval = -EINVAL;
312 317
313 mutex_lock(&m->lock); 318 mutex_lock(&m->lock);
>> 319 m->version = file->f_version;
314 switch (whence) { 320 switch (whence) {
315 case SEEK_CUR: 321 case SEEK_CUR:
316 offset += file->f_pos; 322 offset += file->f_pos;
317 fallthrough; <<
318 case SEEK_SET: 323 case SEEK_SET:
319 if (offset < 0) 324 if (offset < 0)
320 break; 325 break;
321 retval = offset; 326 retval = offset;
322 if (offset != m->read_pos) { 327 if (offset != m->read_pos) {
323 while ((retval = trave 328 while ((retval = traverse(m, offset)) == -EAGAIN)
324 ; 329 ;
325 if (retval) { 330 if (retval) {
326 /* with extrem 331 /* with extreme prejudice... */
327 file->f_pos = 332 file->f_pos = 0;
328 m->read_pos = 333 m->read_pos = 0;
>> 334 m->version = 0;
329 m->index = 0; 335 m->index = 0;
330 m->count = 0; 336 m->count = 0;
331 } else { 337 } else {
332 m->read_pos = 338 m->read_pos = offset;
333 retval = file- 339 retval = file->f_pos = offset;
334 } 340 }
335 } else { 341 } else {
336 file->f_pos = offset; 342 file->f_pos = offset;
337 } 343 }
338 } 344 }
>> 345 file->f_version = m->version;
339 mutex_unlock(&m->lock); 346 mutex_unlock(&m->lock);
340 return retval; 347 return retval;
341 } 348 }
342 EXPORT_SYMBOL(seq_lseek); 349 EXPORT_SYMBOL(seq_lseek);
343 350
344 /** 351 /**
345 * seq_release - free the structures as 352 * seq_release - free the structures associated with sequential file.
346 * @file: file in question 353 * @file: file in question
347 * @inode: its inode 354 * @inode: its inode
348 * 355 *
349 * Frees the structures associated with s 356 * Frees the structures associated with sequential file; can be used
350 * as ->f_op->release() if you don't have 357 * as ->f_op->release() if you don't have private data to destroy.
351 */ 358 */
352 int seq_release(struct inode *inode, struct fi 359 int seq_release(struct inode *inode, struct file *file)
353 { 360 {
354 struct seq_file *m = file->private_dat 361 struct seq_file *m = file->private_data;
355 kvfree(m->buf); 362 kvfree(m->buf);
356 kmem_cache_free(seq_file_cache, m); 363 kmem_cache_free(seq_file_cache, m);
357 return 0; 364 return 0;
358 } 365 }
359 EXPORT_SYMBOL(seq_release); 366 EXPORT_SYMBOL(seq_release);
360 367
361 /** 368 /**
362 * seq_escape_mem - print data into buffer, es !! 369 * seq_escape - print string into buffer, escaping some characters
363 * @m: target buffer !! 370 * @m: target buffer
364 * @src: source buffer !! 371 * @s: string
365 * @len: size of source buffer !! 372 * @esc: set of characters that need escaping
366 * @flags: flags to pass to string_escape_mem( !! 373 *
367 * @esc: set of characters that need escaping !! 374 * Puts string into buffer, replacing each occurrence of character from
368 * !! 375 * @esc with usual octal escape.
369 * Puts data into buffer, replacing each occur !! 376 * Use seq_has_overflowed() to check for errors.
370 * given class (defined by @flags and @esc) wi <<
371 * <<
372 * Use seq_has_overflowed() to check for error <<
373 */ 377 */
374 void seq_escape_mem(struct seq_file *m, const !! 378 void seq_escape(struct seq_file *m, const char *s, const char *esc)
375 unsigned int flags, const <<
376 { 379 {
377 char *buf; 380 char *buf;
378 size_t size = seq_get_buf(m, &buf); 381 size_t size = seq_get_buf(m, &buf);
379 int ret; 382 int ret;
380 383
381 ret = string_escape_mem(src, len, buf, !! 384 ret = string_escape_str(s, buf, size, ESCAPE_OCTAL, esc);
382 seq_commit(m, ret < size ? ret : -1); 385 seq_commit(m, ret < size ? ret : -1);
383 } 386 }
384 EXPORT_SYMBOL(seq_escape_mem); !! 387 EXPORT_SYMBOL(seq_escape);
385 388
386 void seq_vprintf(struct seq_file *m, const cha 389 void seq_vprintf(struct seq_file *m, const char *f, va_list args)
387 { 390 {
388 int len; 391 int len;
389 392
390 if (m->count < m->size) { 393 if (m->count < m->size) {
391 len = vsnprintf(m->buf + m->co 394 len = vsnprintf(m->buf + m->count, m->size - m->count, f, args);
392 if (m->count + len < m->size) 395 if (m->count + len < m->size) {
393 m->count += len; 396 m->count += len;
394 return; 397 return;
395 } 398 }
396 } 399 }
397 seq_set_overflow(m); 400 seq_set_overflow(m);
398 } 401 }
399 EXPORT_SYMBOL(seq_vprintf); 402 EXPORT_SYMBOL(seq_vprintf);
400 403
401 void seq_printf(struct seq_file *m, const char 404 void seq_printf(struct seq_file *m, const char *f, ...)
402 { 405 {
403 va_list args; 406 va_list args;
404 407
405 va_start(args, f); 408 va_start(args, f);
406 seq_vprintf(m, f, args); 409 seq_vprintf(m, f, args);
407 va_end(args); 410 va_end(args);
408 } 411 }
409 EXPORT_SYMBOL(seq_printf); 412 EXPORT_SYMBOL(seq_printf);
410 413
411 #ifdef CONFIG_BINARY_PRINTF <<
412 void seq_bprintf(struct seq_file *m, const cha <<
413 { <<
414 int len; <<
415 <<
416 if (m->count < m->size) { <<
417 len = bstr_printf(m->buf + m-> <<
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 <<
429 /** 414 /**
430 * mangle_path - mangle and copy path t 415 * mangle_path - mangle and copy path to buffer beginning
431 * @s: buffer start 416 * @s: buffer start
432 * @p: beginning of path in above buffer 417 * @p: beginning of path in above buffer
433 * @esc: set of characters that need esca 418 * @esc: set of characters that need escaping
434 * 419 *
435 * Copy the path from @p to @s, replacing 420 * Copy the path from @p to @s, replacing each occurrence of character from
436 * @esc with usual octal escape. 421 * @esc with usual octal escape.
437 * Returns pointer past last written char 422 * Returns pointer past last written character in @s, or NULL in case of
438 * failure. 423 * failure.
439 */ 424 */
440 char *mangle_path(char *s, const char *p, cons 425 char *mangle_path(char *s, const char *p, const char *esc)
441 { 426 {
442 while (s <= p) { 427 while (s <= p) {
443 char c = *p++; 428 char c = *p++;
444 if (!c) { 429 if (!c) {
445 return s; 430 return s;
446 } else if (!strchr(esc, c)) { 431 } else if (!strchr(esc, c)) {
447 *s++ = c; 432 *s++ = c;
448 } else if (s + 4 > p) { 433 } else if (s + 4 > p) {
449 break; 434 break;
450 } else { 435 } else {
451 *s++ = '\\'; 436 *s++ = '\\';
452 *s++ = '' + ((c & 0300 437 *s++ = '' + ((c & 0300) >> 6);
453 *s++ = '' + ((c & 070) 438 *s++ = '' + ((c & 070) >> 3);
454 *s++ = '' + (c & 07); 439 *s++ = '' + (c & 07);
455 } 440 }
456 } 441 }
457 return NULL; 442 return NULL;
458 } 443 }
459 EXPORT_SYMBOL(mangle_path); 444 EXPORT_SYMBOL(mangle_path);
460 445
461 /** 446 /**
462 * seq_path - seq_file interface to print a pa 447 * seq_path - seq_file interface to print a pathname
463 * @m: the seq_file handle 448 * @m: the seq_file handle
464 * @path: the struct path to print 449 * @path: the struct path to print
465 * @esc: set of characters to escape in the ou 450 * @esc: set of characters to escape in the output
466 * 451 *
467 * return the absolute path of 'path', as repr 452 * return the absolute path of 'path', as represented by the
468 * dentry / mnt pair in the path parameter. 453 * dentry / mnt pair in the path parameter.
469 */ 454 */
470 int seq_path(struct seq_file *m, const struct 455 int seq_path(struct seq_file *m, const struct path *path, const char *esc)
471 { 456 {
472 char *buf; 457 char *buf;
473 size_t size = seq_get_buf(m, &buf); 458 size_t size = seq_get_buf(m, &buf);
474 int res = -1; 459 int res = -1;
475 460
476 if (size) { 461 if (size) {
477 char *p = d_path(path, buf, si 462 char *p = d_path(path, buf, size);
478 if (!IS_ERR(p)) { 463 if (!IS_ERR(p)) {
479 char *end = mangle_pat 464 char *end = mangle_path(buf, p, esc);
480 if (end) 465 if (end)
481 res = end - bu 466 res = end - buf;
482 } 467 }
483 } 468 }
484 seq_commit(m, res); 469 seq_commit(m, res);
485 470
486 return res; 471 return res;
487 } 472 }
488 EXPORT_SYMBOL(seq_path); 473 EXPORT_SYMBOL(seq_path);
489 474
490 /** 475 /**
491 * seq_file_path - seq_file interface to print 476 * seq_file_path - seq_file interface to print a pathname of a file
492 * @m: the seq_file handle 477 * @m: the seq_file handle
493 * @file: the struct file to print 478 * @file: the struct file to print
494 * @esc: set of characters to escape in the ou 479 * @esc: set of characters to escape in the output
495 * 480 *
496 * return the absolute path to the file. 481 * return the absolute path to the file.
497 */ 482 */
498 int seq_file_path(struct seq_file *m, struct f 483 int seq_file_path(struct seq_file *m, struct file *file, const char *esc)
499 { 484 {
500 return seq_path(m, &file->f_path, esc) 485 return seq_path(m, &file->f_path, esc);
501 } 486 }
502 EXPORT_SYMBOL(seq_file_path); 487 EXPORT_SYMBOL(seq_file_path);
503 488
504 /* 489 /*
505 * Same as seq_path, but relative to supplied 490 * Same as seq_path, but relative to supplied root.
506 */ 491 */
507 int seq_path_root(struct seq_file *m, const st 492 int seq_path_root(struct seq_file *m, const struct path *path,
508 const struct path *root, con 493 const struct path *root, const char *esc)
509 { 494 {
510 char *buf; 495 char *buf;
511 size_t size = seq_get_buf(m, &buf); 496 size_t size = seq_get_buf(m, &buf);
512 int res = -ENAMETOOLONG; 497 int res = -ENAMETOOLONG;
513 498
514 if (size) { 499 if (size) {
515 char *p; 500 char *p;
516 501
517 p = __d_path(path, root, buf, 502 p = __d_path(path, root, buf, size);
518 if (!p) 503 if (!p)
519 return SEQ_SKIP; 504 return SEQ_SKIP;
520 res = PTR_ERR(p); 505 res = PTR_ERR(p);
521 if (!IS_ERR(p)) { 506 if (!IS_ERR(p)) {
522 char *end = mangle_pat 507 char *end = mangle_path(buf, p, esc);
523 if (end) 508 if (end)
524 res = end - bu 509 res = end - buf;
525 else 510 else
526 res = -ENAMETO 511 res = -ENAMETOOLONG;
527 } 512 }
528 } 513 }
529 seq_commit(m, res); 514 seq_commit(m, res);
530 515
531 return res < 0 && res != -ENAMETOOLONG 516 return res < 0 && res != -ENAMETOOLONG ? res : 0;
532 } 517 }
533 518
534 /* 519 /*
535 * returns the path of the 'dentry' from the r 520 * returns the path of the 'dentry' from the root of its filesystem.
536 */ 521 */
537 int seq_dentry(struct seq_file *m, struct dent 522 int seq_dentry(struct seq_file *m, struct dentry *dentry, const char *esc)
538 { 523 {
539 char *buf; 524 char *buf;
540 size_t size = seq_get_buf(m, &buf); 525 size_t size = seq_get_buf(m, &buf);
541 int res = -1; 526 int res = -1;
542 527
543 if (size) { 528 if (size) {
544 char *p = dentry_path(dentry, 529 char *p = dentry_path(dentry, buf, size);
545 if (!IS_ERR(p)) { 530 if (!IS_ERR(p)) {
546 char *end = mangle_pat 531 char *end = mangle_path(buf, p, esc);
547 if (end) 532 if (end)
548 res = end - bu 533 res = end - buf;
549 } 534 }
550 } 535 }
551 seq_commit(m, res); 536 seq_commit(m, res);
552 537
553 return res; 538 return res;
554 } 539 }
555 EXPORT_SYMBOL(seq_dentry); 540 EXPORT_SYMBOL(seq_dentry);
556 541
557 void *single_start(struct seq_file *p, loff_t !! 542 static void *single_start(struct seq_file *p, loff_t *pos)
558 { 543 {
559 return *pos ? NULL : SEQ_START_TOKEN; !! 544 return NULL + (*pos == 0);
560 } 545 }
561 546
562 static void *single_next(struct seq_file *p, v 547 static void *single_next(struct seq_file *p, void *v, loff_t *pos)
563 { 548 {
564 ++*pos; 549 ++*pos;
565 return NULL; 550 return NULL;
566 } 551 }
567 552
568 static void single_stop(struct seq_file *p, vo 553 static void single_stop(struct seq_file *p, void *v)
569 { 554 {
570 } 555 }
571 556
572 int single_open(struct file *file, int (*show) 557 int single_open(struct file *file, int (*show)(struct seq_file *, void *),
573 void *data) 558 void *data)
574 { 559 {
575 struct seq_operations *op = kmalloc(si 560 struct seq_operations *op = kmalloc(sizeof(*op), GFP_KERNEL_ACCOUNT);
576 int res = -ENOMEM; 561 int res = -ENOMEM;
577 562
578 if (op) { 563 if (op) {
579 op->start = single_start; 564 op->start = single_start;
580 op->next = single_next; 565 op->next = single_next;
581 op->stop = single_stop; 566 op->stop = single_stop;
582 op->show = show; 567 op->show = show;
583 res = seq_open(file, op); 568 res = seq_open(file, op);
584 if (!res) 569 if (!res)
585 ((struct seq_file *)fi 570 ((struct seq_file *)file->private_data)->private = data;
586 else 571 else
587 kfree(op); 572 kfree(op);
588 } 573 }
589 return res; 574 return res;
590 } 575 }
591 EXPORT_SYMBOL(single_open); 576 EXPORT_SYMBOL(single_open);
592 577
593 int single_open_size(struct file *file, int (* 578 int single_open_size(struct file *file, int (*show)(struct seq_file *, void *),
594 void *data, size_t size) 579 void *data, size_t size)
595 { 580 {
596 char *buf = seq_buf_alloc(size); 581 char *buf = seq_buf_alloc(size);
597 int ret; 582 int ret;
598 if (!buf) 583 if (!buf)
599 return -ENOMEM; 584 return -ENOMEM;
600 ret = single_open(file, show, data); 585 ret = single_open(file, show, data);
601 if (ret) { 586 if (ret) {
602 kvfree(buf); 587 kvfree(buf);
603 return ret; 588 return ret;
604 } 589 }
605 ((struct seq_file *)file->private_data 590 ((struct seq_file *)file->private_data)->buf = buf;
606 ((struct seq_file *)file->private_data 591 ((struct seq_file *)file->private_data)->size = size;
607 return 0; 592 return 0;
608 } 593 }
609 EXPORT_SYMBOL(single_open_size); 594 EXPORT_SYMBOL(single_open_size);
610 595
611 int single_release(struct inode *inode, struct 596 int single_release(struct inode *inode, struct file *file)
612 { 597 {
613 const struct seq_operations *op = ((st 598 const struct seq_operations *op = ((struct seq_file *)file->private_data)->op;
614 int res = seq_release(inode, file); 599 int res = seq_release(inode, file);
615 kfree(op); 600 kfree(op);
616 return res; 601 return res;
617 } 602 }
618 EXPORT_SYMBOL(single_release); 603 EXPORT_SYMBOL(single_release);
619 604
620 int seq_release_private(struct inode *inode, s 605 int seq_release_private(struct inode *inode, struct file *file)
621 { 606 {
622 struct seq_file *seq = file->private_d 607 struct seq_file *seq = file->private_data;
623 608
624 kfree(seq->private); 609 kfree(seq->private);
625 seq->private = NULL; 610 seq->private = NULL;
626 return seq_release(inode, file); 611 return seq_release(inode, file);
627 } 612 }
628 EXPORT_SYMBOL(seq_release_private); 613 EXPORT_SYMBOL(seq_release_private);
629 614
630 void *__seq_open_private(struct file *f, const 615 void *__seq_open_private(struct file *f, const struct seq_operations *ops,
631 int psize) 616 int psize)
632 { 617 {
633 int rc; 618 int rc;
634 void *private; 619 void *private;
635 struct seq_file *seq; 620 struct seq_file *seq;
636 621
637 private = kzalloc(psize, GFP_KERNEL_AC 622 private = kzalloc(psize, GFP_KERNEL_ACCOUNT);
638 if (private == NULL) 623 if (private == NULL)
639 goto out; 624 goto out;
640 625
641 rc = seq_open(f, ops); 626 rc = seq_open(f, ops);
642 if (rc < 0) 627 if (rc < 0)
643 goto out_free; 628 goto out_free;
644 629
645 seq = f->private_data; 630 seq = f->private_data;
646 seq->private = private; 631 seq->private = private;
647 return private; 632 return private;
648 633
649 out_free: 634 out_free:
650 kfree(private); 635 kfree(private);
651 out: 636 out:
652 return NULL; 637 return NULL;
653 } 638 }
654 EXPORT_SYMBOL(__seq_open_private); 639 EXPORT_SYMBOL(__seq_open_private);
655 640
656 int seq_open_private(struct file *filp, const 641 int seq_open_private(struct file *filp, const struct seq_operations *ops,
657 int psize) 642 int psize)
658 { 643 {
659 return __seq_open_private(filp, ops, p 644 return __seq_open_private(filp, ops, psize) ? 0 : -ENOMEM;
660 } 645 }
661 EXPORT_SYMBOL(seq_open_private); 646 EXPORT_SYMBOL(seq_open_private);
662 647
663 void seq_putc(struct seq_file *m, char c) 648 void seq_putc(struct seq_file *m, char c)
664 { 649 {
665 if (m->count >= m->size) 650 if (m->count >= m->size)
666 return; 651 return;
667 652
668 m->buf[m->count++] = c; 653 m->buf[m->count++] = c;
669 } 654 }
670 EXPORT_SYMBOL(seq_putc); 655 EXPORT_SYMBOL(seq_putc);
671 656
672 void __seq_puts(struct seq_file *m, const char !! 657 void seq_puts(struct seq_file *m, const char *s)
673 { 658 {
674 seq_write(m, s, strlen(s)); !! 659 int len = strlen(s);
>> 660
>> 661 if (m->count + len >= m->size) {
>> 662 seq_set_overflow(m);
>> 663 return;
>> 664 }
>> 665 memcpy(m->buf + m->count, s, len);
>> 666 m->count += len;
675 } 667 }
676 EXPORT_SYMBOL(__seq_puts); !! 668 EXPORT_SYMBOL(seq_puts);
677 669
678 /** 670 /**
679 * seq_put_decimal_ull_width - A helper routin !! 671 * A helper routine for putting decimal numbers without rich format of printf().
680 * without rich fo <<
681 * only 'unsigned long long' is supported. 672 * only 'unsigned long long' is supported.
682 * @m: seq_file identifying the buffer to whic 673 * @m: seq_file identifying the buffer to which data should be written
683 * @delimiter: a string which is printed befor 674 * @delimiter: a string which is printed before the number
684 * @num: the number 675 * @num: the number
685 * @width: a minimum field width 676 * @width: a minimum field width
686 * 677 *
687 * This routine will put strlen(delimiter) + n 678 * This routine will put strlen(delimiter) + number into seq_filed.
688 * This routine is very quick when you show lo 679 * This routine is very quick when you show lots of numbers.
689 * In usual cases, it will be better to use se 680 * In usual cases, it will be better to use seq_printf(). It's easier to read.
690 */ 681 */
691 void seq_put_decimal_ull_width(struct seq_file 682 void seq_put_decimal_ull_width(struct seq_file *m, const char *delimiter,
692 unsigned long long nu 683 unsigned long long num, unsigned int width)
693 { 684 {
694 int len; 685 int len;
695 686
696 if (m->count + 2 >= m->size) /* we'll 687 if (m->count + 2 >= m->size) /* we'll write 2 bytes at least */
697 goto overflow; 688 goto overflow;
698 689
699 if (delimiter && delimiter[0]) { 690 if (delimiter && delimiter[0]) {
700 if (delimiter[1] == 0) 691 if (delimiter[1] == 0)
701 seq_putc(m, delimiter[ 692 seq_putc(m, delimiter[0]);
702 else 693 else
703 seq_puts(m, delimiter) 694 seq_puts(m, delimiter);
704 } 695 }
705 696
706 if (!width) 697 if (!width)
707 width = 1; 698 width = 1;
708 699
709 if (m->count + width >= m->size) 700 if (m->count + width >= m->size)
710 goto overflow; 701 goto overflow;
711 702
712 len = num_to_str(m->buf + m->count, m- 703 len = num_to_str(m->buf + m->count, m->size - m->count, num, width);
713 if (!len) 704 if (!len)
714 goto overflow; 705 goto overflow;
715 706
716 m->count += len; 707 m->count += len;
717 return; 708 return;
718 709
719 overflow: 710 overflow:
720 seq_set_overflow(m); 711 seq_set_overflow(m);
721 } 712 }
722 713
723 void seq_put_decimal_ull(struct seq_file *m, c 714 void seq_put_decimal_ull(struct seq_file *m, const char *delimiter,
724 unsigned long long nu 715 unsigned long long num)
725 { 716 {
726 return seq_put_decimal_ull_width(m, de 717 return seq_put_decimal_ull_width(m, delimiter, num, 0);
727 } 718 }
728 EXPORT_SYMBOL(seq_put_decimal_ull); 719 EXPORT_SYMBOL(seq_put_decimal_ull);
729 720
730 /** 721 /**
731 * seq_put_hex_ll - put a number in hexadecima 722 * seq_put_hex_ll - put a number in hexadecimal notation
732 * @m: seq_file identifying the buffer to whic 723 * @m: seq_file identifying the buffer to which data should be written
733 * @delimiter: a string which is printed befor 724 * @delimiter: a string which is printed before the number
734 * @v: the number 725 * @v: the number
735 * @width: a minimum field width 726 * @width: a minimum field width
736 * 727 *
737 * seq_put_hex_ll(m, "", v, 8) is equal to seq 728 * seq_put_hex_ll(m, "", v, 8) is equal to seq_printf(m, "%08llx", v)
738 * 729 *
739 * This routine is very quick when you show lo 730 * This routine is very quick when you show lots of numbers.
740 * In usual cases, it will be better to use se 731 * In usual cases, it will be better to use seq_printf(). It's easier to read.
741 */ 732 */
742 void seq_put_hex_ll(struct seq_file *m, const 733 void seq_put_hex_ll(struct seq_file *m, const char *delimiter,
743 unsigned long 734 unsigned long long v, unsigned int width)
744 { 735 {
745 unsigned int len; 736 unsigned int len;
746 int i; 737 int i;
747 738
748 if (delimiter && delimiter[0]) { 739 if (delimiter && delimiter[0]) {
749 if (delimiter[1] == 0) 740 if (delimiter[1] == 0)
750 seq_putc(m, delimiter[ 741 seq_putc(m, delimiter[0]);
751 else 742 else
752 seq_puts(m, delimiter) 743 seq_puts(m, delimiter);
753 } 744 }
754 745
755 /* If x is 0, the result of __builtin_ 746 /* If x is 0, the result of __builtin_clzll is undefined */
756 if (v == 0) 747 if (v == 0)
757 len = 1; 748 len = 1;
758 else 749 else
759 len = (sizeof(v) * 8 - __built 750 len = (sizeof(v) * 8 - __builtin_clzll(v) + 3) / 4;
760 751
761 if (len < width) 752 if (len < width)
762 len = width; 753 len = width;
763 754
764 if (m->count + len > m->size) { 755 if (m->count + len > m->size) {
765 seq_set_overflow(m); 756 seq_set_overflow(m);
766 return; 757 return;
767 } 758 }
768 759
769 for (i = len - 1; i >= 0; i--) { 760 for (i = len - 1; i >= 0; i--) {
770 m->buf[m->count + i] = hex_asc 761 m->buf[m->count + i] = hex_asc[0xf & v];
771 v = v >> 4; 762 v = v >> 4;
772 } 763 }
773 m->count += len; 764 m->count += len;
774 } 765 }
775 766
776 void seq_put_decimal_ll(struct seq_file *m, co 767 void seq_put_decimal_ll(struct seq_file *m, const char *delimiter, long long num)
777 { 768 {
778 int len; 769 int len;
779 770
780 if (m->count + 3 >= m->size) /* we'll 771 if (m->count + 3 >= m->size) /* we'll write 2 bytes at least */
781 goto overflow; 772 goto overflow;
782 773
783 if (delimiter && delimiter[0]) { 774 if (delimiter && delimiter[0]) {
784 if (delimiter[1] == 0) 775 if (delimiter[1] == 0)
785 seq_putc(m, delimiter[ 776 seq_putc(m, delimiter[0]);
786 else 777 else
787 seq_puts(m, delimiter) 778 seq_puts(m, delimiter);
788 } 779 }
789 780
790 if (m->count + 2 >= m->size) 781 if (m->count + 2 >= m->size)
791 goto overflow; 782 goto overflow;
792 783
793 if (num < 0) { 784 if (num < 0) {
794 m->buf[m->count++] = '-'; 785 m->buf[m->count++] = '-';
795 num = -num; 786 num = -num;
796 } 787 }
797 788
798 if (num < 10) { 789 if (num < 10) {
799 m->buf[m->count++] = num + ''; 790 m->buf[m->count++] = num + '';
800 return; 791 return;
801 } 792 }
802 793
803 len = num_to_str(m->buf + m->count, m- 794 len = num_to_str(m->buf + m->count, m->size - m->count, num, 0);
804 if (!len) 795 if (!len)
805 goto overflow; 796 goto overflow;
806 797
807 m->count += len; 798 m->count += len;
808 return; 799 return;
809 800
810 overflow: 801 overflow:
811 seq_set_overflow(m); 802 seq_set_overflow(m);
812 } 803 }
813 EXPORT_SYMBOL(seq_put_decimal_ll); 804 EXPORT_SYMBOL(seq_put_decimal_ll);
814 805
815 /** 806 /**
816 * seq_write - write arbitrary data to buffer 807 * seq_write - write arbitrary data to buffer
817 * @seq: seq_file identifying the buffer to wh 808 * @seq: seq_file identifying the buffer to which data should be written
818 * @data: data address 809 * @data: data address
819 * @len: number of bytes 810 * @len: number of bytes
820 * 811 *
821 * Return 0 on success, non-zero otherwise. 812 * Return 0 on success, non-zero otherwise.
822 */ 813 */
823 int seq_write(struct seq_file *seq, const void 814 int seq_write(struct seq_file *seq, const void *data, size_t len)
824 { 815 {
825 if (seq->count + len < seq->size) { 816 if (seq->count + len < seq->size) {
826 memcpy(seq->buf + seq->count, 817 memcpy(seq->buf + seq->count, data, len);
827 seq->count += len; 818 seq->count += len;
828 return 0; 819 return 0;
829 } 820 }
830 seq_set_overflow(seq); 821 seq_set_overflow(seq);
831 return -1; 822 return -1;
832 } 823 }
833 EXPORT_SYMBOL(seq_write); 824 EXPORT_SYMBOL(seq_write);
834 825
835 /** 826 /**
836 * seq_pad - write padding spaces to buffer 827 * seq_pad - write padding spaces to buffer
837 * @m: seq_file identifying the buffer to whic 828 * @m: seq_file identifying the buffer to which data should be written
838 * @c: the byte to append after padding if non 829 * @c: the byte to append after padding if non-zero
839 */ 830 */
840 void seq_pad(struct seq_file *m, char c) 831 void seq_pad(struct seq_file *m, char c)
841 { 832 {
842 int size = m->pad_until - m->count; 833 int size = m->pad_until - m->count;
843 if (size > 0) { 834 if (size > 0) {
844 if (size + m->count > m->size) 835 if (size + m->count > m->size) {
845 seq_set_overflow(m); 836 seq_set_overflow(m);
846 return; 837 return;
847 } 838 }
848 memset(m->buf + m->count, ' ', 839 memset(m->buf + m->count, ' ', size);
849 m->count += size; 840 m->count += size;
850 } 841 }
851 if (c) 842 if (c)
852 seq_putc(m, c); 843 seq_putc(m, c);
853 } 844 }
854 EXPORT_SYMBOL(seq_pad); 845 EXPORT_SYMBOL(seq_pad);
855 846
856 /* A complete analogue of print_hex_dump() */ 847 /* A complete analogue of print_hex_dump() */
857 void seq_hex_dump(struct seq_file *m, const ch 848 void seq_hex_dump(struct seq_file *m, const char *prefix_str, int prefix_type,
858 int rowsize, int groupsize, 849 int rowsize, int groupsize, const void *buf, size_t len,
859 bool ascii) 850 bool ascii)
860 { 851 {
861 const u8 *ptr = buf; 852 const u8 *ptr = buf;
862 int i, linelen, remaining = len; 853 int i, linelen, remaining = len;
863 char *buffer; 854 char *buffer;
864 size_t size; 855 size_t size;
865 int ret; 856 int ret;
866 857
867 if (rowsize != 16 && rowsize != 32) 858 if (rowsize != 16 && rowsize != 32)
868 rowsize = 16; 859 rowsize = 16;
869 860
870 for (i = 0; i < len && !seq_has_overfl 861 for (i = 0; i < len && !seq_has_overflowed(m); i += rowsize) {
871 linelen = min(remaining, rowsi 862 linelen = min(remaining, rowsize);
872 remaining -= rowsize; 863 remaining -= rowsize;
873 864
874 switch (prefix_type) { 865 switch (prefix_type) {
875 case DUMP_PREFIX_ADDRESS: 866 case DUMP_PREFIX_ADDRESS:
876 seq_printf(m, "%s%p: " 867 seq_printf(m, "%s%p: ", prefix_str, ptr + i);
877 break; 868 break;
878 case DUMP_PREFIX_OFFSET: 869 case DUMP_PREFIX_OFFSET:
879 seq_printf(m, "%s%.8x: 870 seq_printf(m, "%s%.8x: ", prefix_str, i);
880 break; 871 break;
881 default: 872 default:
882 seq_printf(m, "%s", pr 873 seq_printf(m, "%s", prefix_str);
883 break; 874 break;
884 } 875 }
885 876
886 size = seq_get_buf(m, &buffer) 877 size = seq_get_buf(m, &buffer);
887 ret = hex_dump_to_buffer(ptr + 878 ret = hex_dump_to_buffer(ptr + i, linelen, rowsize, groupsize,
888 buffe 879 buffer, size, ascii);
889 seq_commit(m, ret < size ? ret 880 seq_commit(m, ret < size ? ret : -1);
890 881
891 seq_putc(m, '\n'); 882 seq_putc(m, '\n');
892 } 883 }
893 } 884 }
894 EXPORT_SYMBOL(seq_hex_dump); 885 EXPORT_SYMBOL(seq_hex_dump);
895 886
896 struct list_head *seq_list_start(struct list_h 887 struct list_head *seq_list_start(struct list_head *head, loff_t pos)
897 { 888 {
898 struct list_head *lh; 889 struct list_head *lh;
899 890
900 list_for_each(lh, head) 891 list_for_each(lh, head)
901 if (pos-- == 0) 892 if (pos-- == 0)
902 return lh; 893 return lh;
903 894
904 return NULL; 895 return NULL;
905 } 896 }
906 EXPORT_SYMBOL(seq_list_start); 897 EXPORT_SYMBOL(seq_list_start);
907 898
908 struct list_head *seq_list_start_head(struct l 899 struct list_head *seq_list_start_head(struct list_head *head, loff_t pos)
909 { 900 {
910 if (!pos) 901 if (!pos)
911 return head; 902 return head;
912 903
913 return seq_list_start(head, pos - 1); 904 return seq_list_start(head, pos - 1);
914 } 905 }
915 EXPORT_SYMBOL(seq_list_start_head); 906 EXPORT_SYMBOL(seq_list_start_head);
916 907
917 struct list_head *seq_list_next(void *v, struc 908 struct list_head *seq_list_next(void *v, struct list_head *head, loff_t *ppos)
918 { 909 {
919 struct list_head *lh; 910 struct list_head *lh;
920 911
921 lh = ((struct list_head *)v)->next; 912 lh = ((struct list_head *)v)->next;
922 ++*ppos; 913 ++*ppos;
923 return lh == head ? NULL : lh; 914 return lh == head ? NULL : lh;
924 } 915 }
925 EXPORT_SYMBOL(seq_list_next); 916 EXPORT_SYMBOL(seq_list_next);
926 917
927 struct list_head *seq_list_start_rcu(struct li <<
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(stru <<
940 { <<
941 if (!pos) <<
942 return head; <<
943 <<
944 return seq_list_start_rcu(head, pos - <<
945 } <<
946 EXPORT_SYMBOL(seq_list_start_head_rcu); <<
947 <<
948 struct list_head *seq_list_next_rcu(void *v, s <<
949 loff_t *pp <<
950 { <<
951 struct list_head *lh; <<
952 <<
953 lh = list_next_rcu((struct list_head * <<
954 ++*ppos; <<
955 return lh == head ? NULL : lh; <<
956 } <<
957 EXPORT_SYMBOL(seq_list_next_rcu); <<
958 <<
959 /** 918 /**
960 * seq_hlist_start - start an iteration of a h 919 * seq_hlist_start - start an iteration of a hlist
961 * @head: the head of the hlist 920 * @head: the head of the hlist
962 * @pos: the start position of the sequence 921 * @pos: the start position of the sequence
963 * 922 *
964 * Called at seq_file->op->start(). 923 * Called at seq_file->op->start().
965 */ 924 */
966 struct hlist_node *seq_hlist_start(struct hlis 925 struct hlist_node *seq_hlist_start(struct hlist_head *head, loff_t pos)
967 { 926 {
968 struct hlist_node *node; 927 struct hlist_node *node;
969 928
970 hlist_for_each(node, head) 929 hlist_for_each(node, head)
971 if (pos-- == 0) 930 if (pos-- == 0)
972 return node; 931 return node;
973 return NULL; 932 return NULL;
974 } 933 }
975 EXPORT_SYMBOL(seq_hlist_start); 934 EXPORT_SYMBOL(seq_hlist_start);
976 935
977 /** 936 /**
978 * seq_hlist_start_head - start an iteration o 937 * seq_hlist_start_head - start an iteration of a hlist
979 * @head: the head of the hlist 938 * @head: the head of the hlist
980 * @pos: the start position of the sequence 939 * @pos: the start position of the sequence
981 * 940 *
982 * Called at seq_file->op->start(). Call this 941 * Called at seq_file->op->start(). Call this function if you want to
983 * print a header at the top of the output. 942 * print a header at the top of the output.
984 */ 943 */
985 struct hlist_node *seq_hlist_start_head(struct 944 struct hlist_node *seq_hlist_start_head(struct hlist_head *head, loff_t pos)
986 { 945 {
987 if (!pos) 946 if (!pos)
988 return SEQ_START_TOKEN; 947 return SEQ_START_TOKEN;
989 948
990 return seq_hlist_start(head, pos - 1); 949 return seq_hlist_start(head, pos - 1);
991 } 950 }
992 EXPORT_SYMBOL(seq_hlist_start_head); 951 EXPORT_SYMBOL(seq_hlist_start_head);
993 952
994 /** 953 /**
995 * seq_hlist_next - move to the next position 954 * seq_hlist_next - move to the next position of the hlist
996 * @v: the current iterator 955 * @v: the current iterator
997 * @head: the head of the hlist 956 * @head: the head of the hlist
998 * @ppos: the current position 957 * @ppos: the current position
999 * 958 *
1000 * Called at seq_file->op->next(). 959 * Called at seq_file->op->next().
1001 */ 960 */
1002 struct hlist_node *seq_hlist_next(void *v, st 961 struct hlist_node *seq_hlist_next(void *v, struct hlist_head *head,
1003 loff_t *ppo 962 loff_t *ppos)
1004 { 963 {
1005 struct hlist_node *node = v; 964 struct hlist_node *node = v;
1006 965
1007 ++*ppos; 966 ++*ppos;
1008 if (v == SEQ_START_TOKEN) 967 if (v == SEQ_START_TOKEN)
1009 return head->first; 968 return head->first;
1010 else 969 else
1011 return node->next; 970 return node->next;
1012 } 971 }
1013 EXPORT_SYMBOL(seq_hlist_next); 972 EXPORT_SYMBOL(seq_hlist_next);
1014 973
1015 /** 974 /**
1016 * seq_hlist_start_rcu - start an iteration o 975 * seq_hlist_start_rcu - start an iteration of a hlist protected by RCU
1017 * @head: the head of the hlist 976 * @head: the head of the hlist
1018 * @pos: the start position of the sequence 977 * @pos: the start position of the sequence
1019 * 978 *
1020 * Called at seq_file->op->start(). 979 * Called at seq_file->op->start().
1021 * 980 *
1022 * This list-traversal primitive may safely r 981 * This list-traversal primitive may safely run concurrently with
1023 * the _rcu list-mutation primitives such as 982 * the _rcu list-mutation primitives such as hlist_add_head_rcu()
1024 * as long as the traversal is guarded by rcu 983 * as long as the traversal is guarded by rcu_read_lock().
1025 */ 984 */
1026 struct hlist_node *seq_hlist_start_rcu(struct 985 struct hlist_node *seq_hlist_start_rcu(struct hlist_head *head,
1027 loff_t 986 loff_t pos)
1028 { 987 {
1029 struct hlist_node *node; 988 struct hlist_node *node;
1030 989
1031 __hlist_for_each_rcu(node, head) 990 __hlist_for_each_rcu(node, head)
1032 if (pos-- == 0) 991 if (pos-- == 0)
1033 return node; 992 return node;
1034 return NULL; 993 return NULL;
1035 } 994 }
1036 EXPORT_SYMBOL(seq_hlist_start_rcu); 995 EXPORT_SYMBOL(seq_hlist_start_rcu);
1037 996
1038 /** 997 /**
1039 * seq_hlist_start_head_rcu - start an iterat 998 * seq_hlist_start_head_rcu - start an iteration of a hlist protected by RCU
1040 * @head: the head of the hlist 999 * @head: the head of the hlist
1041 * @pos: the start position of the sequence 1000 * @pos: the start position of the sequence
1042 * 1001 *
1043 * Called at seq_file->op->start(). Call this 1002 * Called at seq_file->op->start(). Call this function if you want to
1044 * print a header at the top of the output. 1003 * print a header at the top of the output.
1045 * 1004 *
1046 * This list-traversal primitive may safely r 1005 * This list-traversal primitive may safely run concurrently with
1047 * the _rcu list-mutation primitives such as 1006 * the _rcu list-mutation primitives such as hlist_add_head_rcu()
1048 * as long as the traversal is guarded by rcu 1007 * as long as the traversal is guarded by rcu_read_lock().
1049 */ 1008 */
1050 struct hlist_node *seq_hlist_start_head_rcu(s 1009 struct hlist_node *seq_hlist_start_head_rcu(struct hlist_head *head,
1051 l 1010 loff_t pos)
1052 { 1011 {
1053 if (!pos) 1012 if (!pos)
1054 return SEQ_START_TOKEN; 1013 return SEQ_START_TOKEN;
1055 1014
1056 return seq_hlist_start_rcu(head, pos 1015 return seq_hlist_start_rcu(head, pos - 1);
1057 } 1016 }
1058 EXPORT_SYMBOL(seq_hlist_start_head_rcu); 1017 EXPORT_SYMBOL(seq_hlist_start_head_rcu);
1059 1018
1060 /** 1019 /**
1061 * seq_hlist_next_rcu - move to the next posi 1020 * seq_hlist_next_rcu - move to the next position of the hlist protected by RCU
1062 * @v: the current iterator 1021 * @v: the current iterator
1063 * @head: the head of the hlist 1022 * @head: the head of the hlist
1064 * @ppos: the current position 1023 * @ppos: the current position
1065 * 1024 *
1066 * Called at seq_file->op->next(). 1025 * Called at seq_file->op->next().
1067 * 1026 *
1068 * This list-traversal primitive may safely r 1027 * This list-traversal primitive may safely run concurrently with
1069 * the _rcu list-mutation primitives such as 1028 * the _rcu list-mutation primitives such as hlist_add_head_rcu()
1070 * as long as the traversal is guarded by rcu 1029 * as long as the traversal is guarded by rcu_read_lock().
1071 */ 1030 */
1072 struct hlist_node *seq_hlist_next_rcu(void *v 1031 struct hlist_node *seq_hlist_next_rcu(void *v,
1073 struct 1032 struct hlist_head *head,
1074 loff_t 1033 loff_t *ppos)
1075 { 1034 {
1076 struct hlist_node *node = v; 1035 struct hlist_node *node = v;
1077 1036
1078 ++*ppos; 1037 ++*ppos;
1079 if (v == SEQ_START_TOKEN) 1038 if (v == SEQ_START_TOKEN)
1080 return rcu_dereference(head-> 1039 return rcu_dereference(head->first);
1081 else 1040 else
1082 return rcu_dereference(node-> 1041 return rcu_dereference(node->next);
1083 } 1042 }
1084 EXPORT_SYMBOL(seq_hlist_next_rcu); 1043 EXPORT_SYMBOL(seq_hlist_next_rcu);
1085 1044
1086 /** 1045 /**
1087 * seq_hlist_start_percpu - start an iteratio !! 1046 * seq_hlist_start_precpu - start an iteration of a percpu hlist array
1088 * @head: pointer to percpu array of struct h 1047 * @head: pointer to percpu array of struct hlist_heads
1089 * @cpu: pointer to cpu "cursor" 1048 * @cpu: pointer to cpu "cursor"
1090 * @pos: start position of sequence 1049 * @pos: start position of sequence
1091 * 1050 *
1092 * Called at seq_file->op->start(). 1051 * Called at seq_file->op->start().
1093 */ 1052 */
1094 struct hlist_node * 1053 struct hlist_node *
1095 seq_hlist_start_percpu(struct hlist_head __pe 1054 seq_hlist_start_percpu(struct hlist_head __percpu *head, int *cpu, loff_t pos)
1096 { 1055 {
1097 struct hlist_node *node; 1056 struct hlist_node *node;
1098 1057
1099 for_each_possible_cpu(*cpu) { 1058 for_each_possible_cpu(*cpu) {
1100 hlist_for_each(node, per_cpu_ 1059 hlist_for_each(node, per_cpu_ptr(head, *cpu)) {
1101 if (pos-- == 0) 1060 if (pos-- == 0)
1102 return node; 1061 return node;
1103 } 1062 }
1104 } 1063 }
1105 return NULL; 1064 return NULL;
1106 } 1065 }
1107 EXPORT_SYMBOL(seq_hlist_start_percpu); 1066 EXPORT_SYMBOL(seq_hlist_start_percpu);
1108 1067
1109 /** 1068 /**
1110 * seq_hlist_next_percpu - move to the next p 1069 * seq_hlist_next_percpu - move to the next position of the percpu hlist array
1111 * @v: pointer to current hlist_node 1070 * @v: pointer to current hlist_node
1112 * @head: pointer to percpu array of struct h 1071 * @head: pointer to percpu array of struct hlist_heads
1113 * @cpu: pointer to cpu "cursor" 1072 * @cpu: pointer to cpu "cursor"
1114 * @pos: start position of sequence 1073 * @pos: start position of sequence
1115 * 1074 *
1116 * Called at seq_file->op->next(). 1075 * Called at seq_file->op->next().
1117 */ 1076 */
1118 struct hlist_node * 1077 struct hlist_node *
1119 seq_hlist_next_percpu(void *v, struct hlist_h 1078 seq_hlist_next_percpu(void *v, struct hlist_head __percpu *head,
1120 int *cpu, loff_t *pos 1079 int *cpu, loff_t *pos)
1121 { 1080 {
1122 struct hlist_node *node = v; 1081 struct hlist_node *node = v;
1123 1082
1124 ++*pos; 1083 ++*pos;
1125 1084
1126 if (node->next) 1085 if (node->next)
1127 return node->next; 1086 return node->next;
1128 1087
1129 for (*cpu = cpumask_next(*cpu, cpu_po 1088 for (*cpu = cpumask_next(*cpu, cpu_possible_mask); *cpu < nr_cpu_ids;
1130 *cpu = cpumask_next(*cpu, cpu_po 1089 *cpu = cpumask_next(*cpu, cpu_possible_mask)) {
1131 struct hlist_head *bucket = p 1090 struct hlist_head *bucket = per_cpu_ptr(head, *cpu);
1132 1091
1133 if (!hlist_empty(bucket)) 1092 if (!hlist_empty(bucket))
1134 return bucket->first; 1093 return bucket->first;
1135 } 1094 }
1136 return NULL; 1095 return NULL;
1137 } 1096 }
1138 EXPORT_SYMBOL(seq_hlist_next_percpu); 1097 EXPORT_SYMBOL(seq_hlist_next_percpu);
1139 1098
1140 void __init seq_file_init(void) 1099 void __init seq_file_init(void)
1141 { 1100 {
1142 seq_file_cache = KMEM_CACHE(seq_file, 1101 seq_file_cache = KMEM_CACHE(seq_file, SLAB_ACCOUNT|SLAB_PANIC);
1143 } 1102 }
1144 1103
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