Commit | Line | Data |
---|---|---|
ca01d6dd TL |
1 | /* |
2 | * Persistent Storage - platform driver interface parts. | |
3 | * | |
f29e5956 | 4 | * Copyright (C) 2007-2008 Google, Inc. |
ca01d6dd TL |
5 | * Copyright (C) 2010 Intel Corporation <tony.luck@intel.com> |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
19 | */ | |
20 | ||
ef748853 FF |
21 | #define pr_fmt(fmt) "pstore: " fmt |
22 | ||
ca01d6dd TL |
23 | #include <linux/atomic.h> |
24 | #include <linux/types.h> | |
25 | #include <linux/errno.h> | |
26 | #include <linux/init.h> | |
27 | #include <linux/kmsg_dump.h> | |
f29e5956 | 28 | #include <linux/console.h> |
ca01d6dd TL |
29 | #include <linux/module.h> |
30 | #include <linux/pstore.h> | |
b0aad7a9 | 31 | #include <linux/zlib.h> |
ca01d6dd | 32 | #include <linux/string.h> |
6dda9266 | 33 | #include <linux/timer.h> |
ca01d6dd TL |
34 | #include <linux/slab.h> |
35 | #include <linux/uaccess.h> | |
abd4d558 | 36 | #include <linux/hardirq.h> |
a3f5f075 | 37 | #include <linux/jiffies.h> |
6dda9266 | 38 | #include <linux/workqueue.h> |
ca01d6dd TL |
39 | |
40 | #include "internal.h" | |
41 | ||
6dda9266 LT |
42 | /* |
43 | * We defer making "oops" entries appear in pstore - see | |
44 | * whether the system is actually still running well enough | |
45 | * to let someone see the entry | |
46 | */ | |
521f7288 | 47 | static int pstore_update_ms = -1; |
a3f5f075 AV |
48 | module_param_named(update_ms, pstore_update_ms, int, 0600); |
49 | MODULE_PARM_DESC(update_ms, "milliseconds before pstore updates its content " | |
521f7288 AV |
50 | "(default is -1, which means runtime updates are disabled; " |
51 | "enabling this option is not safe, it may lead to further " | |
52 | "corruption on Oopses)"); | |
6dda9266 LT |
53 | |
54 | static int pstore_new_entry; | |
55 | ||
56 | static void pstore_timefunc(unsigned long); | |
57 | static DEFINE_TIMER(pstore_timer, pstore_timefunc, 0, 0); | |
58 | ||
59 | static void pstore_dowork(struct work_struct *); | |
60 | static DECLARE_WORK(pstore_work, pstore_dowork); | |
61 | ||
ca01d6dd TL |
62 | /* |
63 | * pstore_lock just protects "psinfo" during | |
64 | * calls to pstore_register() | |
65 | */ | |
66 | static DEFINE_SPINLOCK(pstore_lock); | |
060287b8 | 67 | struct pstore_info *psinfo; |
ca01d6dd | 68 | |
dee28e72 MG |
69 | static char *backend; |
70 | ||
b0aad7a9 AB |
71 | /* Compression parameters */ |
72 | #define COMPR_LEVEL 6 | |
73 | #define WINDOW_BITS 12 | |
74 | #define MEM_LEVEL 4 | |
75 | static struct z_stream_s stream; | |
76 | ||
77 | static char *big_oops_buf; | |
78 | static size_t big_oops_buf_sz; | |
79 | ||
366f7e7a | 80 | /* How much of the console log to snapshot */ |
ca01d6dd TL |
81 | static unsigned long kmsg_bytes = 10240; |
82 | ||
366f7e7a | 83 | void pstore_set_kmsg_bytes(int bytes) |
ca01d6dd | 84 | { |
366f7e7a | 85 | kmsg_bytes = bytes; |
ca01d6dd TL |
86 | } |
87 | ||
ca01d6dd TL |
88 | /* Tag each group of saved records with a sequence number */ |
89 | static int oopscount; | |
90 | ||
381b872c SA |
91 | static const char *get_reason_str(enum kmsg_dump_reason reason) |
92 | { | |
93 | switch (reason) { | |
94 | case KMSG_DUMP_PANIC: | |
95 | return "Panic"; | |
96 | case KMSG_DUMP_OOPS: | |
97 | return "Oops"; | |
98 | case KMSG_DUMP_EMERG: | |
99 | return "Emergency"; | |
100 | case KMSG_DUMP_RESTART: | |
101 | return "Restart"; | |
102 | case KMSG_DUMP_HALT: | |
103 | return "Halt"; | |
104 | case KMSG_DUMP_POWEROFF: | |
105 | return "Poweroff"; | |
106 | default: | |
107 | return "Unknown"; | |
108 | } | |
109 | } | |
9f6af27f | 110 | |
9f244e9c SA |
111 | bool pstore_cannot_block_path(enum kmsg_dump_reason reason) |
112 | { | |
113 | /* | |
114 | * In case of NMI path, pstore shouldn't be blocked | |
115 | * regardless of reason. | |
116 | */ | |
117 | if (in_nmi()) | |
118 | return true; | |
119 | ||
120 | switch (reason) { | |
121 | /* In panic case, other cpus are stopped by smp_send_stop(). */ | |
122 | case KMSG_DUMP_PANIC: | |
123 | /* Emergency restart shouldn't be blocked by spin lock. */ | |
124 | case KMSG_DUMP_EMERG: | |
125 | return true; | |
126 | default: | |
127 | return false; | |
128 | } | |
129 | } | |
130 | EXPORT_SYMBOL_GPL(pstore_cannot_block_path); | |
131 | ||
b0aad7a9 AB |
132 | /* Derived from logfs_compress() */ |
133 | static int pstore_compress(const void *in, void *out, size_t inlen, | |
134 | size_t outlen) | |
135 | { | |
136 | int err, ret; | |
137 | ||
138 | ret = -EIO; | |
139 | err = zlib_deflateInit2(&stream, COMPR_LEVEL, Z_DEFLATED, WINDOW_BITS, | |
140 | MEM_LEVEL, Z_DEFAULT_STRATEGY); | |
141 | if (err != Z_OK) | |
142 | goto error; | |
143 | ||
144 | stream.next_in = in; | |
145 | stream.avail_in = inlen; | |
146 | stream.total_in = 0; | |
147 | stream.next_out = out; | |
148 | stream.avail_out = outlen; | |
149 | stream.total_out = 0; | |
150 | ||
151 | err = zlib_deflate(&stream, Z_FINISH); | |
152 | if (err != Z_STREAM_END) | |
153 | goto error; | |
154 | ||
155 | err = zlib_deflateEnd(&stream); | |
156 | if (err != Z_OK) | |
157 | goto error; | |
158 | ||
159 | if (stream.total_out >= stream.total_in) | |
160 | goto error; | |
161 | ||
162 | ret = stream.total_out; | |
163 | error: | |
164 | return ret; | |
165 | } | |
166 | ||
adb42f5e AB |
167 | /* Derived from logfs_uncompress */ |
168 | static int pstore_decompress(void *in, void *out, size_t inlen, size_t outlen) | |
169 | { | |
170 | int err, ret; | |
171 | ||
172 | ret = -EIO; | |
b61edf8e | 173 | err = zlib_inflateInit2(&stream, WINDOW_BITS); |
adb42f5e AB |
174 | if (err != Z_OK) |
175 | goto error; | |
176 | ||
177 | stream.next_in = in; | |
178 | stream.avail_in = inlen; | |
179 | stream.total_in = 0; | |
180 | stream.next_out = out; | |
181 | stream.avail_out = outlen; | |
182 | stream.total_out = 0; | |
183 | ||
184 | err = zlib_inflate(&stream, Z_FINISH); | |
185 | if (err != Z_STREAM_END) | |
186 | goto error; | |
187 | ||
188 | err = zlib_inflateEnd(&stream); | |
189 | if (err != Z_OK) | |
190 | goto error; | |
191 | ||
192 | ret = stream.total_out; | |
193 | error: | |
194 | return ret; | |
195 | } | |
196 | ||
b0aad7a9 AB |
197 | static void allocate_buf_for_compression(void) |
198 | { | |
199 | size_t size; | |
7de8fe2f AB |
200 | size_t cmpr; |
201 | ||
202 | switch (psinfo->bufsize) { | |
203 | /* buffer range for efivars */ | |
204 | case 1000 ... 2000: | |
205 | cmpr = 56; | |
206 | break; | |
207 | case 2001 ... 3000: | |
208 | cmpr = 54; | |
209 | break; | |
210 | case 3001 ... 3999: | |
211 | cmpr = 52; | |
212 | break; | |
213 | /* buffer range for nvram, erst */ | |
214 | case 4000 ... 10000: | |
215 | cmpr = 45; | |
216 | break; | |
217 | default: | |
218 | cmpr = 60; | |
219 | break; | |
220 | } | |
b0aad7a9 | 221 | |
7de8fe2f | 222 | big_oops_buf_sz = (psinfo->bufsize * 100) / cmpr; |
b0aad7a9 AB |
223 | big_oops_buf = kmalloc(big_oops_buf_sz, GFP_KERNEL); |
224 | if (big_oops_buf) { | |
225 | size = max(zlib_deflate_workspacesize(WINDOW_BITS, MEM_LEVEL), | |
226 | zlib_inflate_workspacesize()); | |
227 | stream.workspace = kmalloc(size, GFP_KERNEL); | |
228 | if (!stream.workspace) { | |
ef748853 | 229 | pr_err("No memory for compression workspace; skipping compression\n"); |
b0aad7a9 AB |
230 | kfree(big_oops_buf); |
231 | big_oops_buf = NULL; | |
232 | } | |
233 | } else { | |
ef748853 | 234 | pr_err("No memory for uncompressed data; skipping compression\n"); |
b0aad7a9 AB |
235 | stream.workspace = NULL; |
236 | } | |
237 | ||
238 | } | |
239 | ||
ee1d2674 GT |
240 | static void free_buf_for_compression(void) |
241 | { | |
242 | kfree(stream.workspace); | |
243 | stream.workspace = NULL; | |
244 | kfree(big_oops_buf); | |
245 | big_oops_buf = NULL; | |
246 | } | |
247 | ||
b0aad7a9 AB |
248 | /* |
249 | * Called when compression fails, since the printk buffer | |
250 | * would be fetched for compression calling it again when | |
251 | * compression fails would have moved the iterator of | |
252 | * printk buffer which results in fetching old contents. | |
253 | * Copy the recent messages from big_oops_buf to psinfo->buf | |
254 | */ | |
255 | static size_t copy_kmsg_to_buffer(int hsize, size_t len) | |
256 | { | |
257 | size_t total_len; | |
258 | size_t diff; | |
259 | ||
260 | total_len = hsize + len; | |
261 | ||
262 | if (total_len > psinfo->bufsize) { | |
263 | diff = total_len - psinfo->bufsize + hsize; | |
264 | memcpy(psinfo->buf, big_oops_buf, hsize); | |
265 | memcpy(psinfo->buf + hsize, big_oops_buf + diff, | |
266 | psinfo->bufsize - hsize); | |
267 | total_len = psinfo->bufsize; | |
268 | } else | |
269 | memcpy(psinfo->buf, big_oops_buf, total_len); | |
270 | ||
271 | return total_len; | |
272 | } | |
273 | ||
ca01d6dd TL |
274 | /* |
275 | * callback from kmsg_dump. (s2,l2) has the most recently | |
276 | * written bytes, older bytes are in (s1,l1). Save as much | |
277 | * as we can from the end of the buffer. | |
278 | */ | |
279 | static void pstore_dump(struct kmsg_dumper *dumper, | |
e2ae715d | 280 | enum kmsg_dump_reason reason) |
ca01d6dd | 281 | { |
e2ae715d | 282 | unsigned long total = 0; |
381b872c | 283 | const char *why; |
ca01d6dd | 284 | u64 id; |
b94fdd07 | 285 | unsigned int part = 1; |
abd4d558 DZ |
286 | unsigned long flags = 0; |
287 | int is_locked = 0; | |
e2ae715d | 288 | int ret; |
ca01d6dd | 289 | |
381b872c | 290 | why = get_reason_str(reason); |
9f6af27f | 291 | |
9f244e9c SA |
292 | if (pstore_cannot_block_path(reason)) { |
293 | is_locked = spin_trylock_irqsave(&psinfo->buf_lock, flags); | |
294 | if (!is_locked) { | |
295 | pr_err("pstore dump routine blocked in %s path, may corrupt error record\n" | |
296 | , in_nmi() ? "NMI" : why); | |
297 | } | |
abd4d558 DZ |
298 | } else |
299 | spin_lock_irqsave(&psinfo->buf_lock, flags); | |
ca01d6dd TL |
300 | oopscount++; |
301 | while (total < kmsg_bytes) { | |
e2ae715d KS |
302 | char *dst; |
303 | unsigned long size; | |
304 | int hsize; | |
b0aad7a9 | 305 | int zipped_len = -1; |
e2ae715d | 306 | size_t len; |
b0aad7a9 AB |
307 | bool compressed; |
308 | size_t total_len; | |
e2ae715d | 309 | |
f0e2efcf | 310 | if (big_oops_buf && is_locked) { |
b0aad7a9 | 311 | dst = big_oops_buf; |
a6b8978c | 312 | hsize = sprintf(dst, "%s#%d Part%u\n", why, |
b0aad7a9 AB |
313 | oopscount, part); |
314 | size = big_oops_buf_sz - hsize; | |
ca01d6dd | 315 | |
b0aad7a9 AB |
316 | if (!kmsg_dump_get_buffer(dumper, true, dst + hsize, |
317 | size, &len)) | |
318 | break; | |
319 | ||
320 | zipped_len = pstore_compress(dst, psinfo->buf, | |
321 | hsize + len, psinfo->bufsize); | |
322 | ||
323 | if (zipped_len > 0) { | |
324 | compressed = true; | |
325 | total_len = zipped_len; | |
326 | } else { | |
b0aad7a9 AB |
327 | compressed = false; |
328 | total_len = copy_kmsg_to_buffer(hsize, len); | |
329 | } | |
330 | } else { | |
331 | dst = psinfo->buf; | |
a6b8978c | 332 | hsize = sprintf(dst, "%s#%d Part%u\n", why, oopscount, |
b0aad7a9 AB |
333 | part); |
334 | size = psinfo->bufsize - hsize; | |
335 | dst += hsize; | |
336 | ||
337 | if (!kmsg_dump_get_buffer(dumper, true, dst, | |
338 | size, &len)) | |
339 | break; | |
340 | ||
341 | compressed = false; | |
342 | total_len = hsize + len; | |
343 | } | |
ca01d6dd | 344 | |
3d6d8d20 | 345 | ret = psinfo->write(PSTORE_TYPE_DMESG, reason, &id, part, |
b0aad7a9 | 346 | oopscount, compressed, total_len, psinfo); |
b238b8fa | 347 | if (ret == 0 && reason == KMSG_DUMP_OOPS && pstore_is_mounted()) |
6dda9266 | 348 | pstore_new_entry = 1; |
e2ae715d | 349 | |
b0aad7a9 | 350 | total += total_len; |
56280682 | 351 | part++; |
ca01d6dd | 352 | } |
9f244e9c | 353 | if (pstore_cannot_block_path(reason)) { |
abd4d558 | 354 | if (is_locked) |
9f244e9c | 355 | spin_unlock_irqrestore(&psinfo->buf_lock, flags); |
abd4d558 DZ |
356 | } else |
357 | spin_unlock_irqrestore(&psinfo->buf_lock, flags); | |
ca01d6dd TL |
358 | } |
359 | ||
360 | static struct kmsg_dumper pstore_dumper = { | |
361 | .dump = pstore_dump, | |
362 | }; | |
363 | ||
306e5c2a GT |
364 | /* |
365 | * Register with kmsg_dump to save last part of console log on panic. | |
366 | */ | |
18730411 GT |
367 | static void pstore_register_kmsg(void) |
368 | { | |
369 | kmsg_dump_register(&pstore_dumper); | |
370 | } | |
371 | ||
ee1d2674 GT |
372 | static void pstore_unregister_kmsg(void) |
373 | { | |
374 | kmsg_dump_unregister(&pstore_dumper); | |
375 | } | |
376 | ||
f29e5956 AV |
377 | #ifdef CONFIG_PSTORE_CONSOLE |
378 | static void pstore_console_write(struct console *con, const char *s, unsigned c) | |
379 | { | |
380 | const char *e = s + c; | |
381 | ||
382 | while (s < e) { | |
383 | unsigned long flags; | |
70a6f46d | 384 | u64 id; |
f29e5956 AV |
385 | |
386 | if (c > psinfo->bufsize) | |
387 | c = psinfo->bufsize; | |
80c9d03c CL |
388 | |
389 | if (oops_in_progress) { | |
390 | if (!spin_trylock_irqsave(&psinfo->buf_lock, flags)) | |
391 | break; | |
392 | } else { | |
393 | spin_lock_irqsave(&psinfo->buf_lock, flags); | |
394 | } | |
f29e5956 | 395 | memcpy(psinfo->buf, s, c); |
6bbbca73 | 396 | psinfo->write(PSTORE_TYPE_CONSOLE, 0, &id, 0, 0, 0, c, psinfo); |
f29e5956 AV |
397 | spin_unlock_irqrestore(&psinfo->buf_lock, flags); |
398 | s += c; | |
399 | c = e - s; | |
400 | } | |
401 | } | |
402 | ||
403 | static struct console pstore_console = { | |
404 | .name = "pstore", | |
405 | .write = pstore_console_write, | |
406 | .flags = CON_PRINTBUFFER | CON_ENABLED | CON_ANYTIME, | |
407 | .index = -1, | |
408 | }; | |
409 | ||
410 | static void pstore_register_console(void) | |
411 | { | |
412 | register_console(&pstore_console); | |
413 | } | |
ee1d2674 GT |
414 | |
415 | static void pstore_unregister_console(void) | |
416 | { | |
417 | unregister_console(&pstore_console); | |
418 | } | |
f29e5956 AV |
419 | #else |
420 | static void pstore_register_console(void) {} | |
ee1d2674 | 421 | static void pstore_unregister_console(void) {} |
f29e5956 AV |
422 | #endif |
423 | ||
897dba02 AV |
424 | static int pstore_write_compat(enum pstore_type_id type, |
425 | enum kmsg_dump_reason reason, | |
755d4fe4 | 426 | u64 *id, unsigned int part, int count, |
b3b515bb | 427 | bool compressed, size_t size, |
6bbbca73 | 428 | struct pstore_info *psi) |
897dba02 | 429 | { |
b3b515bb | 430 | return psi->write_buf(type, reason, id, part, psinfo->buf, compressed, |
6bbbca73 | 431 | size, psi); |
897dba02 AV |
432 | } |
433 | ||
ca01d6dd TL |
434 | /* |
435 | * platform specific persistent storage driver registers with | |
436 | * us here. If pstore is already mounted, call the platform | |
437 | * read function right away to populate the file system. If not | |
438 | * then the pstore mount code will call us later to fill out | |
439 | * the file system. | |
ca01d6dd TL |
440 | */ |
441 | int pstore_register(struct pstore_info *psi) | |
442 | { | |
443 | struct module *owner = psi->owner; | |
444 | ||
8e48b1a8 LS |
445 | if (backend && strcmp(backend, psi->name)) |
446 | return -EPERM; | |
447 | ||
ca01d6dd TL |
448 | spin_lock(&pstore_lock); |
449 | if (psinfo) { | |
450 | spin_unlock(&pstore_lock); | |
451 | return -EBUSY; | |
452 | } | |
dee28e72 | 453 | |
897dba02 AV |
454 | if (!psi->write) |
455 | psi->write = pstore_write_compat; | |
ca01d6dd | 456 | psinfo = psi; |
f6f82851 | 457 | mutex_init(&psinfo->read_mutex); |
ca01d6dd TL |
458 | spin_unlock(&pstore_lock); |
459 | ||
460 | if (owner && !try_module_get(owner)) { | |
461 | psinfo = NULL; | |
462 | return -EINVAL; | |
463 | } | |
464 | ||
b0aad7a9 AB |
465 | allocate_buf_for_compression(); |
466 | ||
ca01d6dd | 467 | if (pstore_is_mounted()) |
6dda9266 | 468 | pstore_get_records(0); |
ca01d6dd | 469 | |
18730411 | 470 | pstore_register_kmsg(); |
df36ac1b LT |
471 | |
472 | if ((psi->flags & PSTORE_FLAGS_FRAGILE) == 0) { | |
473 | pstore_register_console(); | |
474 | pstore_register_ftrace(); | |
9d5438f4 | 475 | pstore_register_pmsg(); |
df36ac1b | 476 | } |
ca01d6dd | 477 | |
a3f5f075 AV |
478 | if (pstore_update_ms >= 0) { |
479 | pstore_timer.expires = jiffies + | |
480 | msecs_to_jiffies(pstore_update_ms); | |
481 | add_timer(&pstore_timer); | |
482 | } | |
6dda9266 | 483 | |
42222c2a WL |
484 | /* |
485 | * Update the module parameter backend, so it is visible | |
486 | * through /sys/module/pstore/parameters/backend | |
487 | */ | |
488 | backend = psi->name; | |
489 | ||
ee1d2674 GT |
490 | module_put(owner); |
491 | ||
ef748853 | 492 | pr_info("Registered %s as persistent store backend\n", psi->name); |
8e48b1a8 | 493 | |
ca01d6dd TL |
494 | return 0; |
495 | } | |
496 | EXPORT_SYMBOL_GPL(pstore_register); | |
497 | ||
ee1d2674 GT |
498 | void pstore_unregister(struct pstore_info *psi) |
499 | { | |
500 | pstore_unregister_pmsg(); | |
501 | pstore_unregister_ftrace(); | |
502 | pstore_unregister_console(); | |
503 | pstore_unregister_kmsg(); | |
504 | ||
505 | free_buf_for_compression(); | |
506 | ||
507 | psinfo = NULL; | |
508 | backend = NULL; | |
509 | } | |
510 | EXPORT_SYMBOL_GPL(pstore_unregister); | |
511 | ||
ca01d6dd | 512 | /* |
6dda9266 LT |
513 | * Read all the records from the persistent store. Create |
514 | * files in our filesystem. Don't warn about -EEXIST errors | |
515 | * when we are re-scanning the backing store looking to add new | |
516 | * error records. | |
ca01d6dd | 517 | */ |
6dda9266 | 518 | void pstore_get_records(int quiet) |
ca01d6dd TL |
519 | { |
520 | struct pstore_info *psi = psinfo; | |
f6f82851 | 521 | char *buf = NULL; |
8d38d74b | 522 | ssize_t size; |
ca01d6dd | 523 | u64 id; |
755d4fe4 | 524 | int count; |
ca01d6dd TL |
525 | enum pstore_type_id type; |
526 | struct timespec time; | |
06cf91b4 | 527 | int failed = 0, rc; |
9a4e1398 | 528 | bool compressed; |
adb42f5e | 529 | int unzipped_len = -1; |
ca01d6dd TL |
530 | |
531 | if (!psi) | |
532 | return; | |
533 | ||
f6f82851 | 534 | mutex_lock(&psi->read_mutex); |
2174f6df | 535 | if (psi->open && psi->open(psi)) |
06cf91b4 CG |
536 | goto out; |
537 | ||
9a4e1398 AB |
538 | while ((size = psi->read(&id, &type, &count, &time, &buf, &compressed, |
539 | psi)) > 0) { | |
adb42f5e AB |
540 | if (compressed && (type == PSTORE_TYPE_DMESG)) { |
541 | if (big_oops_buf) | |
542 | unzipped_len = pstore_decompress(buf, | |
543 | big_oops_buf, size, | |
544 | big_oops_buf_sz); | |
545 | ||
546 | if (unzipped_len > 0) { | |
e32634f5 | 547 | kfree(buf); |
adb42f5e AB |
548 | buf = big_oops_buf; |
549 | size = unzipped_len; | |
9ad2cbe0 | 550 | compressed = false; |
adb42f5e | 551 | } else { |
ef748853 FF |
552 | pr_err("decompression failed;returned %d\n", |
553 | unzipped_len); | |
9ad2cbe0 | 554 | compressed = true; |
adb42f5e AB |
555 | } |
556 | } | |
755d4fe4 | 557 | rc = pstore_mkfile(type, psi->name, id, count, buf, |
9ad2cbe0 | 558 | compressed, (size_t)size, time, psi); |
adb42f5e AB |
559 | if (unzipped_len < 0) { |
560 | /* Free buffer other than big oops */ | |
561 | kfree(buf); | |
562 | buf = NULL; | |
563 | } else | |
564 | unzipped_len = -1; | |
6dda9266 | 565 | if (rc && (rc != -EEXIST || !quiet)) |
ca01d6dd TL |
566 | failed++; |
567 | } | |
2174f6df KC |
568 | if (psi->close) |
569 | psi->close(psi); | |
06cf91b4 | 570 | out: |
f6f82851 | 571 | mutex_unlock(&psi->read_mutex); |
ca01d6dd TL |
572 | |
573 | if (failed) | |
ef748853 FF |
574 | pr_warn("failed to load %d record(s) from '%s'\n", |
575 | failed, psi->name); | |
ca01d6dd TL |
576 | } |
577 | ||
6dda9266 LT |
578 | static void pstore_dowork(struct work_struct *work) |
579 | { | |
580 | pstore_get_records(1); | |
581 | } | |
582 | ||
583 | static void pstore_timefunc(unsigned long dummy) | |
584 | { | |
585 | if (pstore_new_entry) { | |
586 | pstore_new_entry = 0; | |
587 | schedule_work(&pstore_work); | |
588 | } | |
589 | ||
a3f5f075 | 590 | mod_timer(&pstore_timer, jiffies + msecs_to_jiffies(pstore_update_ms)); |
6dda9266 LT |
591 | } |
592 | ||
dee28e72 MG |
593 | module_param(backend, charp, 0444); |
594 | MODULE_PARM_DESC(backend, "Pstore backend to use"); |