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Merge branch 'for-3.2-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj...
[zen-stable.git] / fs / jffs2 / erase.c
blobe513f1913c1522a8e9e8dbc4f501a4804507d182
1 /*
2 * JFFS2 -- Journalling Flash File System, Version 2.
3 *
4 * Copyright © 2001-2007 Red Hat, Inc.
5 * Copyright © 2004-2010 David Woodhouse <dwmw2@infradead.org>
6 *
7 * Created by David Woodhouse <dwmw2@infradead.org>
8 *
9 * For licensing information, see the file 'LICENCE' in this directory.
10 *
11 */
12
13 #include <linux/kernel.h>
14 #include <linux/slab.h>
15 #include <linux/mtd/mtd.h>
16 #include <linux/compiler.h>
17 #include <linux/crc32.h>
18 #include <linux/sched.h>
19 #include <linux/pagemap.h>
20 #include "nodelist.h"
21
22 struct erase_priv_struct {
23 struct jffs2_eraseblock *jeb;
24 struct jffs2_sb_info *c;
25 };
26
27 #ifndef __ECOS
28 static void jffs2_erase_callback(struct erase_info *);
29 #endif
30 static void jffs2_erase_failed(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, uint32_t bad_offset);
31 static void jffs2_erase_succeeded(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb);
32 static void jffs2_mark_erased_block(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb);
33
34 static void jffs2_erase_block(struct jffs2_sb_info *c,
35 struct jffs2_eraseblock *jeb)
36 {
37 int ret;
38 uint32_t bad_offset;
39 #ifdef __ECOS
40 ret = jffs2_flash_erase(c, jeb);
41 if (!ret) {
42 jffs2_erase_succeeded(c, jeb);
43 return;
44 }
45 bad_offset = jeb->offset;
46 #else /* Linux */
47 struct erase_info *instr;
48
49 D1(printk(KERN_DEBUG "jffs2_erase_block(): erase block %#08x (range %#08x-%#08x)\n",
50 jeb->offset, jeb->offset, jeb->offset + c->sector_size));
51 instr = kmalloc(sizeof(struct erase_info) + sizeof(struct erase_priv_struct), GFP_KERNEL);
52 if (!instr) {
53 printk(KERN_WARNING "kmalloc for struct erase_info in jffs2_erase_block failed. Refiling block for later\n");
54 mutex_lock(&c->erase_free_sem);
55 spin_lock(&c->erase_completion_lock);
56 list_move(&jeb->list, &c->erase_pending_list);
57 c->erasing_size -= c->sector_size;
58 c->dirty_size += c->sector_size;
59 jeb->dirty_size = c->sector_size;
60 spin_unlock(&c->erase_completion_lock);
61 mutex_unlock(&c->erase_free_sem);
62 return;
63 }
64
65 memset(instr, 0, sizeof(*instr));
66
67 instr->mtd = c->mtd;
68 instr->addr = jeb->offset;
69 instr->len = c->sector_size;
70 instr->callback = jffs2_erase_callback;
71 instr->priv = (unsigned long)(&instr[1]);
72 instr->fail_addr = MTD_FAIL_ADDR_UNKNOWN;
73
74 ((struct erase_priv_struct *)instr->priv)->jeb = jeb;
75 ((struct erase_priv_struct *)instr->priv)->c = c;
76
77 ret = c->mtd->erase(c->mtd, instr);
78 if (!ret)
79 return;
80
81 bad_offset = instr->fail_addr;
82 kfree(instr);
83 #endif /* __ECOS */
84
85 if (ret == -ENOMEM || ret == -EAGAIN) {
86 /* Erase failed immediately. Refile it on the list */
87 D1(printk(KERN_DEBUG "Erase at 0x%08x failed: %d. Refiling on erase_pending_list\n", jeb->offset, ret));
88 mutex_lock(&c->erase_free_sem);
89 spin_lock(&c->erase_completion_lock);
90 list_move(&jeb->list, &c->erase_pending_list);
91 c->erasing_size -= c->sector_size;
92 c->dirty_size += c->sector_size;
93 jeb->dirty_size = c->sector_size;
94 spin_unlock(&c->erase_completion_lock);
95 mutex_unlock(&c->erase_free_sem);
96 return;
97 }
98
99 if (ret == -EROFS)
100 printk(KERN_WARNING "Erase at 0x%08x failed immediately: -EROFS. Is the sector locked?\n", jeb->offset);
101 else
102 printk(KERN_WARNING "Erase at 0x%08x failed immediately: errno %d\n", jeb->offset, ret);
103
104 jffs2_erase_failed(c, jeb, bad_offset);
105 }
106
107 int jffs2_erase_pending_blocks(struct jffs2_sb_info *c, int count)
108 {
109 struct jffs2_eraseblock *jeb;
110 int work_done = 0;
111
112 mutex_lock(&c->erase_free_sem);
113
114 spin_lock(&c->erase_completion_lock);
115
116 while (!list_empty(&c->erase_complete_list) ||
117 !list_empty(&c->erase_pending_list)) {
118
119 if (!list_empty(&c->erase_complete_list)) {
120 jeb = list_entry(c->erase_complete_list.next, struct jffs2_eraseblock, list);
121 list_move(&jeb->list, &c->erase_checking_list);
122 spin_unlock(&c->erase_completion_lock);
123 mutex_unlock(&c->erase_free_sem);
124 jffs2_mark_erased_block(c, jeb);
125
126 work_done++;
127 if (!--count) {
128 D1(printk(KERN_DEBUG "Count reached. jffs2_erase_pending_blocks leaving\n"));
129 goto done;
130 }
131
132 } else if (!list_empty(&c->erase_pending_list)) {
133 jeb = list_entry(c->erase_pending_list.next, struct jffs2_eraseblock, list);
134 D1(printk(KERN_DEBUG "Starting erase of pending block 0x%08x\n", jeb->offset));
135 list_del(&jeb->list);
136 c->erasing_size += c->sector_size;
137 c->wasted_size -= jeb->wasted_size;
138 c->free_size -= jeb->free_size;
139 c->used_size -= jeb->used_size;
140 c->dirty_size -= jeb->dirty_size;
141 jeb->wasted_size = jeb->used_size = jeb->dirty_size = jeb->free_size = 0;
142 jffs2_free_jeb_node_refs(c, jeb);
143 list_add(&jeb->list, &c->erasing_list);
144 spin_unlock(&c->erase_completion_lock);
145 mutex_unlock(&c->erase_free_sem);
146
147 jffs2_erase_block(c, jeb);
148
149 } else {
150 BUG();
151 }
152
153 /* Be nice */
154 cond_resched();
155 mutex_lock(&c->erase_free_sem);
156 spin_lock(&c->erase_completion_lock);
157 }
158
159 spin_unlock(&c->erase_completion_lock);
160 mutex_unlock(&c->erase_free_sem);
161 done:
162 D1(printk(KERN_DEBUG "jffs2_erase_pending_blocks completed\n"));
163 return work_done;
164 }
165
166 static void jffs2_erase_succeeded(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb)
167 {
168 D1(printk(KERN_DEBUG "Erase completed successfully at 0x%08x\n", jeb->offset));
169 mutex_lock(&c->erase_free_sem);
170 spin_lock(&c->erase_completion_lock);
171 list_move_tail(&jeb->list, &c->erase_complete_list);
172 /* Wake the GC thread to mark them clean */
173 jffs2_garbage_collect_trigger(c);
174 spin_unlock(&c->erase_completion_lock);
175 mutex_unlock(&c->erase_free_sem);
176 wake_up(&c->erase_wait);
177 }
178
179 static void jffs2_erase_failed(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, uint32_t bad_offset)
180 {
181 /* For NAND, if the failure did not occur at the device level for a
182 specific physical page, don't bother updating the bad block table. */
183 if (jffs2_cleanmarker_oob(c) && (bad_offset != (uint32_t)MTD_FAIL_ADDR_UNKNOWN)) {
184 /* We had a device-level failure to erase. Let's see if we've
185 failed too many times. */
186 if (!jffs2_write_nand_badblock(c, jeb, bad_offset)) {
187 /* We'd like to give this block another try. */
188 mutex_lock(&c->erase_free_sem);
189 spin_lock(&c->erase_completion_lock);
190 list_move(&jeb->list, &c->erase_pending_list);
191 c->erasing_size -= c->sector_size;
192 c->dirty_size += c->sector_size;
193 jeb->dirty_size = c->sector_size;
194 spin_unlock(&c->erase_completion_lock);
195 mutex_unlock(&c->erase_free_sem);
196 return;
197 }
198 }
199
200 mutex_lock(&c->erase_free_sem);
201 spin_lock(&c->erase_completion_lock);
202 c->erasing_size -= c->sector_size;
203 c->bad_size += c->sector_size;
204 list_move(&jeb->list, &c->bad_list);
205 c->nr_erasing_blocks--;
206 spin_unlock(&c->erase_completion_lock);
207 mutex_unlock(&c->erase_free_sem);
208 wake_up(&c->erase_wait);
209 }
210
211 #ifndef __ECOS
212 static void jffs2_erase_callback(struct erase_info *instr)
213 {
214 struct erase_priv_struct *priv = (void *)instr->priv;
215
216 if(instr->state != MTD_ERASE_DONE) {
217 printk(KERN_WARNING "Erase at 0x%08llx finished, but state != MTD_ERASE_DONE. State is 0x%x instead.\n",
218 (unsigned long long)instr->addr, instr->state);
219 jffs2_erase_failed(priv->c, priv->jeb, instr->fail_addr);
220 } else {
221 jffs2_erase_succeeded(priv->c, priv->jeb);
222 }
223 kfree(instr);
224 }
225 #endif /* !__ECOS */
226
227 /* Hmmm. Maybe we should accept the extra space it takes and make
228 this a standard doubly-linked list? */
229 static inline void jffs2_remove_node_refs_from_ino_list(struct jffs2_sb_info *c,
230 struct jffs2_raw_node_ref *ref, struct jffs2_eraseblock *jeb)
231 {
232 struct jffs2_inode_cache *ic = NULL;
233 struct jffs2_raw_node_ref **prev;
234
235 prev = &ref->next_in_ino;
236
237 /* Walk the inode's list once, removing any nodes from this eraseblock */
238 while (1) {
239 if (!(*prev)->next_in_ino) {
240 /* We're looking at the jffs2_inode_cache, which is
241 at the end of the linked list. Stash it and continue
242 from the beginning of the list */
243 ic = (struct jffs2_inode_cache *)(*prev);
244 prev = &ic->nodes;
245 continue;
246 }
247
248 if (SECTOR_ADDR((*prev)->flash_offset) == jeb->offset) {
249 /* It's in the block we're erasing */
250 struct jffs2_raw_node_ref *this;
251
252 this = *prev;
253 *prev = this->next_in_ino;
254 this->next_in_ino = NULL;
255
256 if (this == ref)
257 break;
258
259 continue;
260 }
261 /* Not to be deleted. Skip */
262 prev = &((*prev)->next_in_ino);
263 }
264
265 /* PARANOIA */
266 if (!ic) {
267 JFFS2_WARNING("inode_cache/xattr_datum/xattr_ref"
268 " not found in remove_node_refs()!!\n");
269 return;
270 }
271
272 D1(printk(KERN_DEBUG "Removed nodes in range 0x%08x-0x%08x from ino #%u\n",
273 jeb->offset, jeb->offset + c->sector_size, ic->ino));
274
275 D2({
276 int i=0;
277 struct jffs2_raw_node_ref *this;
278 printk(KERN_DEBUG "After remove_node_refs_from_ino_list: \n");
279
280 this = ic->nodes;
281
282 printk(KERN_DEBUG);
283 while(this) {
284 printk(KERN_CONT "0x%08x(%d)->",
285 ref_offset(this), ref_flags(this));
286 if (++i == 5) {
287 printk(KERN_DEBUG);
288 i=0;
289 }
290 this = this->next_in_ino;
291 }
292 printk(KERN_CONT "\n");
293 });
294
295 switch (ic->class) {
296 #ifdef CONFIG_JFFS2_FS_XATTR
297 case RAWNODE_CLASS_XATTR_DATUM:
298 jffs2_release_xattr_datum(c, (struct jffs2_xattr_datum *)ic);
299 break;
300 case RAWNODE_CLASS_XATTR_REF:
301 jffs2_release_xattr_ref(c, (struct jffs2_xattr_ref *)ic);
302 break;
303 #endif
304 default:
305 if (ic->nodes == (void *)ic && ic->pino_nlink == 0)
306 jffs2_del_ino_cache(c, ic);
307 }
308 }
309
310 void jffs2_free_jeb_node_refs(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb)
311 {
312 struct jffs2_raw_node_ref *block, *ref;
313 D1(printk(KERN_DEBUG "Freeing all node refs for eraseblock offset 0x%08x\n", jeb->offset));
314
315 block = ref = jeb->first_node;
316
317 while (ref) {
318 if (ref->flash_offset == REF_LINK_NODE) {
319 ref = ref->next_in_ino;
320 jffs2_free_refblock(block);
321 block = ref;
322 continue;
323 }
324 if (ref->flash_offset != REF_EMPTY_NODE && ref->next_in_ino)
325 jffs2_remove_node_refs_from_ino_list(c, ref, jeb);
326 /* else it was a non-inode node or already removed, so don't bother */
327
328 ref++;
329 }
330 jeb->first_node = jeb->last_node = NULL;
331 }
332
333 static int jffs2_block_check_erase(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, uint32_t *bad_offset)
334 {
335 void *ebuf;
336 uint32_t ofs;
337 size_t retlen;
338 int ret = -EIO;
339
340 if (c->mtd->point) {
341 unsigned long *wordebuf;
342
343 ret = c->mtd->point(c->mtd, jeb->offset, c->sector_size,
344 &retlen, &ebuf, NULL);
345 if (ret) {
346 D1(printk(KERN_DEBUG "MTD point failed %d\n", ret));
347 goto do_flash_read;
348 }
349 if (retlen < c->sector_size) {
350 /* Don't muck about if it won't let us point to the whole erase sector */
351 D1(printk(KERN_DEBUG "MTD point returned len too short: 0x%zx\n", retlen));
352 c->mtd->unpoint(c->mtd, jeb->offset, retlen);
353 goto do_flash_read;
354 }
355 wordebuf = ebuf-sizeof(*wordebuf);
356 retlen /= sizeof(*wordebuf);
357 do {
358 if (*++wordebuf != ~0)
359 break;
360 } while(--retlen);
361 c->mtd->unpoint(c->mtd, jeb->offset, c->sector_size);
362 if (retlen) {
363 printk(KERN_WARNING "Newly-erased block contained word 0x%lx at offset 0x%08tx\n",
364 *wordebuf, jeb->offset + c->sector_size-retlen*sizeof(*wordebuf));
365 return -EIO;
366 }
367 return 0;
368 }
369 do_flash_read:
370 ebuf = kmalloc(PAGE_SIZE, GFP_KERNEL);
371 if (!ebuf) {
372 printk(KERN_WARNING "Failed to allocate page buffer for verifying erase at 0x%08x. Refiling\n", jeb->offset);
373 return -EAGAIN;
374 }
375
376 D1(printk(KERN_DEBUG "Verifying erase at 0x%08x\n", jeb->offset));
377
378 for (ofs = jeb->offset; ofs < jeb->offset + c->sector_size; ) {
379 uint32_t readlen = min((uint32_t)PAGE_SIZE, jeb->offset + c->sector_size - ofs);
380 int i;
381
382 *bad_offset = ofs;
383
384 ret = c->mtd->read(c->mtd, ofs, readlen, &retlen, ebuf);
385 if (ret) {
386 printk(KERN_WARNING "Read of newly-erased block at 0x%08x failed: %d. Putting on bad_list\n", ofs, ret);
387 ret = -EIO;
388 goto fail;
389 }
390 if (retlen != readlen) {
391 printk(KERN_WARNING "Short read from newly-erased block at 0x%08x. Wanted %d, got %zd\n", ofs, readlen, retlen);
392 ret = -EIO;
393 goto fail;
394 }
395 for (i=0; i<readlen; i += sizeof(unsigned long)) {
396 /* It's OK. We know it's properly aligned */
397 unsigned long *datum = ebuf + i;
398 if (*datum + 1) {
399 *bad_offset += i;
400 printk(KERN_WARNING "Newly-erased block contained word 0x%lx at offset 0x%08x\n", *datum, *bad_offset);
401 ret = -EIO;
402 goto fail;
403 }
404 }
405 ofs += readlen;
406 cond_resched();
407 }
408 ret = 0;
409 fail:
410 kfree(ebuf);
411 return ret;
412 }
413
414 static void jffs2_mark_erased_block(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb)
415 {
416 size_t retlen;
417 int ret;
418 uint32_t uninitialized_var(bad_offset);
419
420 switch (jffs2_block_check_erase(c, jeb, &bad_offset)) {
421 case -EAGAIN: goto refile;
422 case -EIO: goto filebad;
423 }
424
425 /* Write the erase complete marker */
426 D1(printk(KERN_DEBUG "Writing erased marker to block at 0x%08x\n", jeb->offset));
427 bad_offset = jeb->offset;
428
429 /* Cleanmarker in oob area or no cleanmarker at all ? */
430 if (jffs2_cleanmarker_oob(c) || c->cleanmarker_size == 0) {
431
432 if (jffs2_cleanmarker_oob(c)) {
433 if (jffs2_write_nand_cleanmarker(c, jeb))
434 goto filebad;
435 }
436 } else {
437
438 struct kvec vecs[1];
439 struct jffs2_unknown_node marker = {
440 .magic = cpu_to_je16(JFFS2_MAGIC_BITMASK),
441 .nodetype = cpu_to_je16(JFFS2_NODETYPE_CLEANMARKER),
442 .totlen = cpu_to_je32(c->cleanmarker_size)
443 };
444
445 jffs2_prealloc_raw_node_refs(c, jeb, 1);
446
447 marker.hdr_crc = cpu_to_je32(crc32(0, &marker, sizeof(struct jffs2_unknown_node)-4));
448
449 vecs[0].iov_base = (unsigned char *) &marker;
450 vecs[0].iov_len = sizeof(marker);
451 ret = jffs2_flash_direct_writev(c, vecs, 1, jeb->offset, &retlen);
452
453 if (ret || retlen != sizeof(marker)) {
454 if (ret)
455 printk(KERN_WARNING "Write clean marker to block at 0x%08x failed: %d\n",
456 jeb->offset, ret);
457 else
458 printk(KERN_WARNING "Short write to newly-erased block at 0x%08x: Wanted %zd, got %zd\n",
459 jeb->offset, sizeof(marker), retlen);
460
461 goto filebad;
462 }
463 }
464 /* Everything else got zeroed before the erase */
465 jeb->free_size = c->sector_size;
466
467 mutex_lock(&c->erase_free_sem);
468 spin_lock(&c->erase_completion_lock);
469
470 c->erasing_size -= c->sector_size;
471 c->free_size += c->sector_size;
472
473 /* Account for cleanmarker now, if it's in-band */
474 if (c->cleanmarker_size && !jffs2_cleanmarker_oob(c))
475 jffs2_link_node_ref(c, jeb, jeb->offset | REF_NORMAL, c->cleanmarker_size, NULL);
476
477 list_move_tail(&jeb->list, &c->free_list);
478 c->nr_erasing_blocks--;
479 c->nr_free_blocks++;
480
481 jffs2_dbg_acct_sanity_check_nolock(c, jeb);
482 jffs2_dbg_acct_paranoia_check_nolock(c, jeb);
483
484 spin_unlock(&c->erase_completion_lock);
485 mutex_unlock(&c->erase_free_sem);
486 wake_up(&c->erase_wait);
487 return;
488
489 filebad:
490 jffs2_erase_failed(c, jeb, bad_offset);
491 return;
492
493 refile:
494 /* Stick it back on the list from whence it came and come back later */
495 mutex_lock(&c->erase_free_sem);
496 spin_lock(&c->erase_completion_lock);
497 jffs2_garbage_collect_trigger(c);
498 list_move(&jeb->list, &c->erase_complete_list);
499 spin_unlock(&c->erase_completion_lock);
500 mutex_unlock(&c->erase_free_sem);
501 return;
502 }