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PCI: clean up search.c a lot
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / jffs2 / erase.c
bloba1db9180633fcb3476757af80f22b3e6621f06d2
1 /*
2 * JFFS2 -- Journalling Flash File System, Version 2.
3 *
4 * Copyright © 2001-2007 Red Hat, Inc.
5 *
6 * Created by David Woodhouse <dwmw2@infradead.org>
7 *
8 * For licensing information, see the file 'LICENCE' in this directory.
9 *
10 */
11
12 #include <linux/kernel.h>
13 #include <linux/slab.h>
14 #include <linux/mtd/mtd.h>
15 #include <linux/compiler.h>
16 #include <linux/crc32.h>
17 #include <linux/sched.h>
18 #include <linux/pagemap.h>
19 #include "nodelist.h"
20
21 struct erase_priv_struct {
22 struct jffs2_eraseblock *jeb;
23 struct jffs2_sb_info *c;
24 };
25
26 #ifndef __ECOS
27 static void jffs2_erase_callback(struct erase_info *);
28 #endif
29 static void jffs2_erase_failed(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, uint32_t bad_offset);
30 static void jffs2_erase_succeeded(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb);
31 static void jffs2_mark_erased_block(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb);
32
33 static void jffs2_erase_block(struct jffs2_sb_info *c,
34 struct jffs2_eraseblock *jeb)
35 {
36 int ret;
37 uint32_t bad_offset;
38 #ifdef __ECOS
39 ret = jffs2_flash_erase(c, jeb);
40 if (!ret) {
41 jffs2_erase_succeeded(c, jeb);
42 return;
43 }
44 bad_offset = jeb->offset;
45 #else /* Linux */
46 struct erase_info *instr;
47
48 D1(printk(KERN_DEBUG "jffs2_erase_block(): erase block %#08x (range %#08x-%#08x)\n",
49 jeb->offset, jeb->offset, jeb->offset + c->sector_size));
50 instr = kmalloc(sizeof(struct erase_info) + sizeof(struct erase_priv_struct), GFP_KERNEL);
51 if (!instr) {
52 printk(KERN_WARNING "kmalloc for struct erase_info in jffs2_erase_block failed. Refiling block for later\n");
53 down(&c->erase_free_sem);
54 spin_lock(&c->erase_completion_lock);
55 list_move(&jeb->list, &c->erase_pending_list);
56 c->erasing_size -= c->sector_size;
57 c->dirty_size += c->sector_size;
58 jeb->dirty_size = c->sector_size;
59 spin_unlock(&c->erase_completion_lock);
60 up(&c->erase_free_sem);
61 return;
62 }
63
64 memset(instr, 0, sizeof(*instr));
65
66 instr->mtd = c->mtd;
67 instr->addr = jeb->offset;
68 instr->len = c->sector_size;
69 instr->callback = jffs2_erase_callback;
70 instr->priv = (unsigned long)(&instr[1]);
71 instr->fail_addr = 0xffffffff;
72
73 ((struct erase_priv_struct *)instr->priv)->jeb = jeb;
74 ((struct erase_priv_struct *)instr->priv)->c = c;
75
76 ret = c->mtd->erase(c->mtd, instr);
77 if (!ret)
78 return;
79
80 bad_offset = instr->fail_addr;
81 kfree(instr);
82 #endif /* __ECOS */
83
84 if (ret == -ENOMEM || ret == -EAGAIN) {
85 /* Erase failed immediately. Refile it on the list */
86 D1(printk(KERN_DEBUG "Erase at 0x%08x failed: %d. Refiling on erase_pending_list\n", jeb->offset, ret));
87 down(&c->erase_free_sem);
88 spin_lock(&c->erase_completion_lock);
89 list_move(&jeb->list, &c->erase_pending_list);
90 c->erasing_size -= c->sector_size;
91 c->dirty_size += c->sector_size;
92 jeb->dirty_size = c->sector_size;
93 spin_unlock(&c->erase_completion_lock);
94 up(&c->erase_free_sem);
95 return;
96 }
97
98 if (ret == -EROFS)
99 printk(KERN_WARNING "Erase at 0x%08x failed immediately: -EROFS. Is the sector locked?\n", jeb->offset);
100 else
101 printk(KERN_WARNING "Erase at 0x%08x failed immediately: errno %d\n", jeb->offset, ret);
102
103 jffs2_erase_failed(c, jeb, bad_offset);
104 }
105
106 void jffs2_erase_pending_blocks(struct jffs2_sb_info *c, int count)
107 {
108 struct jffs2_eraseblock *jeb;
109
110 down(&c->erase_free_sem);
111
112 spin_lock(&c->erase_completion_lock);
113
114 while (!list_empty(&c->erase_complete_list) ||
115 !list_empty(&c->erase_pending_list)) {
116
117 if (!list_empty(&c->erase_complete_list)) {
118 jeb = list_entry(c->erase_complete_list.next, struct jffs2_eraseblock, list);
119 list_del(&jeb->list);
120 spin_unlock(&c->erase_completion_lock);
121 up(&c->erase_free_sem);
122 jffs2_mark_erased_block(c, jeb);
123
124 if (!--count) {
125 D1(printk(KERN_DEBUG "Count reached. jffs2_erase_pending_blocks leaving\n"));
126 goto done;
127 }
128
129 } else if (!list_empty(&c->erase_pending_list)) {
130 jeb = list_entry(c->erase_pending_list.next, struct jffs2_eraseblock, list);
131 D1(printk(KERN_DEBUG "Starting erase of pending block 0x%08x\n", jeb->offset));
132 list_del(&jeb->list);
133 c->erasing_size += c->sector_size;
134 c->wasted_size -= jeb->wasted_size;
135 c->free_size -= jeb->free_size;
136 c->used_size -= jeb->used_size;
137 c->dirty_size -= jeb->dirty_size;
138 jeb->wasted_size = jeb->used_size = jeb->dirty_size = jeb->free_size = 0;
139 jffs2_free_jeb_node_refs(c, jeb);
140 list_add(&jeb->list, &c->erasing_list);
141 spin_unlock(&c->erase_completion_lock);
142 up(&c->erase_free_sem);
143
144 jffs2_erase_block(c, jeb);
145
146 } else {
147 BUG();
148 }
149
150 /* Be nice */
151 yield();
152 down(&c->erase_free_sem);
153 spin_lock(&c->erase_completion_lock);
154 }
155
156 spin_unlock(&c->erase_completion_lock);
157 up(&c->erase_free_sem);
158 done:
159 D1(printk(KERN_DEBUG "jffs2_erase_pending_blocks completed\n"));
160 }
161
162 static void jffs2_erase_succeeded(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb)
163 {
164 D1(printk(KERN_DEBUG "Erase completed successfully at 0x%08x\n", jeb->offset));
165 down(&c->erase_free_sem);
166 spin_lock(&c->erase_completion_lock);
167 list_move_tail(&jeb->list, &c->erase_complete_list);
168 spin_unlock(&c->erase_completion_lock);
169 up(&c->erase_free_sem);
170 /* Ensure that kupdated calls us again to mark them clean */
171 jffs2_erase_pending_trigger(c);
172 }
173
174 static void jffs2_erase_failed(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, uint32_t bad_offset)
175 {
176 /* For NAND, if the failure did not occur at the device level for a
177 specific physical page, don't bother updating the bad block table. */
178 if (jffs2_cleanmarker_oob(c) && (bad_offset != 0xffffffff)) {
179 /* We had a device-level failure to erase. Let's see if we've
180 failed too many times. */
181 if (!jffs2_write_nand_badblock(c, jeb, bad_offset)) {
182 /* We'd like to give this block another try. */
183 down(&c->erase_free_sem);
184 spin_lock(&c->erase_completion_lock);
185 list_move(&jeb->list, &c->erase_pending_list);
186 c->erasing_size -= c->sector_size;
187 c->dirty_size += c->sector_size;
188 jeb->dirty_size = c->sector_size;
189 spin_unlock(&c->erase_completion_lock);
190 up(&c->erase_free_sem);
191 return;
192 }
193 }
194
195 down(&c->erase_free_sem);
196 spin_lock(&c->erase_completion_lock);
197 c->erasing_size -= c->sector_size;
198 c->bad_size += c->sector_size;
199 list_move(&jeb->list, &c->bad_list);
200 c->nr_erasing_blocks--;
201 spin_unlock(&c->erase_completion_lock);
202 up(&c->erase_free_sem);
203 wake_up(&c->erase_wait);
204 }
205
206 #ifndef __ECOS
207 static void jffs2_erase_callback(struct erase_info *instr)
208 {
209 struct erase_priv_struct *priv = (void *)instr->priv;
210
211 if(instr->state != MTD_ERASE_DONE) {
212 printk(KERN_WARNING "Erase at 0x%08x finished, but state != MTD_ERASE_DONE. State is 0x%x instead.\n", instr->addr, instr->state);
213 jffs2_erase_failed(priv->c, priv->jeb, instr->fail_addr);
214 } else {
215 jffs2_erase_succeeded(priv->c, priv->jeb);
216 }
217 kfree(instr);
218 }
219 #endif /* !__ECOS */
220
221 /* Hmmm. Maybe we should accept the extra space it takes and make
222 this a standard doubly-linked list? */
223 static inline void jffs2_remove_node_refs_from_ino_list(struct jffs2_sb_info *c,
224 struct jffs2_raw_node_ref *ref, struct jffs2_eraseblock *jeb)
225 {
226 struct jffs2_inode_cache *ic = NULL;
227 struct jffs2_raw_node_ref **prev;
228
229 prev = &ref->next_in_ino;
230
231 /* Walk the inode's list once, removing any nodes from this eraseblock */
232 while (1) {
233 if (!(*prev)->next_in_ino) {
234 /* We're looking at the jffs2_inode_cache, which is
235 at the end of the linked list. Stash it and continue
236 from the beginning of the list */
237 ic = (struct jffs2_inode_cache *)(*prev);
238 prev = &ic->nodes;
239 continue;
240 }
241
242 if (SECTOR_ADDR((*prev)->flash_offset) == jeb->offset) {
243 /* It's in the block we're erasing */
244 struct jffs2_raw_node_ref *this;
245
246 this = *prev;
247 *prev = this->next_in_ino;
248 this->next_in_ino = NULL;
249
250 if (this == ref)
251 break;
252
253 continue;
254 }
255 /* Not to be deleted. Skip */
256 prev = &((*prev)->next_in_ino);
257 }
258
259 /* PARANOIA */
260 if (!ic) {
261 JFFS2_WARNING("inode_cache/xattr_datum/xattr_ref"
262 " not found in remove_node_refs()!!\n");
263 return;
264 }
265
266 D1(printk(KERN_DEBUG "Removed nodes in range 0x%08x-0x%08x from ino #%u\n",
267 jeb->offset, jeb->offset + c->sector_size, ic->ino));
268
269 D2({
270 int i=0;
271 struct jffs2_raw_node_ref *this;
272 printk(KERN_DEBUG "After remove_node_refs_from_ino_list: \n" KERN_DEBUG);
273
274 this = ic->nodes;
275
276 while(this) {
277 printk( "0x%08x(%d)->", ref_offset(this), ref_flags(this));
278 if (++i == 5) {
279 printk("\n" KERN_DEBUG);
280 i=0;
281 }
282 this = this->next_in_ino;
283 }
284 printk("\n");
285 });
286
287 switch (ic->class) {
288 #ifdef CONFIG_JFFS2_FS_XATTR
289 case RAWNODE_CLASS_XATTR_DATUM:
290 jffs2_release_xattr_datum(c, (struct jffs2_xattr_datum *)ic);
291 break;
292 case RAWNODE_CLASS_XATTR_REF:
293 jffs2_release_xattr_ref(c, (struct jffs2_xattr_ref *)ic);
294 break;
295 #endif
296 default:
297 if (ic->nodes == (void *)ic && ic->nlink == 0)
298 jffs2_del_ino_cache(c, ic);
299 }
300 }
301
302 void jffs2_free_jeb_node_refs(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb)
303 {
304 struct jffs2_raw_node_ref *block, *ref;
305 D1(printk(KERN_DEBUG "Freeing all node refs for eraseblock offset 0x%08x\n", jeb->offset));
306
307 block = ref = jeb->first_node;
308
309 while (ref) {
310 if (ref->flash_offset == REF_LINK_NODE) {
311 ref = ref->next_in_ino;
312 jffs2_free_refblock(block);
313 block = ref;
314 continue;
315 }
316 if (ref->flash_offset != REF_EMPTY_NODE && ref->next_in_ino)
317 jffs2_remove_node_refs_from_ino_list(c, ref, jeb);
318 /* else it was a non-inode node or already removed, so don't bother */
319
320 ref++;
321 }
322 jeb->first_node = jeb->last_node = NULL;
323 }
324
325 static int jffs2_block_check_erase(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, uint32_t *bad_offset)
326 {
327 void *ebuf;
328 uint32_t ofs;
329 size_t retlen;
330 int ret = -EIO;
331
332 if (c->mtd->point) {
333 unsigned long *wordebuf;
334
335 ret = c->mtd->point(c->mtd, jeb->offset, c->sector_size, &retlen, (unsigned char **)&ebuf);
336 if (ret) {
337 D1(printk(KERN_DEBUG "MTD point failed %d\n", ret));
338 goto do_flash_read;
339 }
340 if (retlen < c->sector_size) {
341 /* Don't muck about if it won't let us point to the whole erase sector */
342 D1(printk(KERN_DEBUG "MTD point returned len too short: 0x%zx\n", retlen));
343 c->mtd->unpoint(c->mtd, ebuf, jeb->offset, retlen);
344 goto do_flash_read;
345 }
346 wordebuf = ebuf-sizeof(*wordebuf);
347 retlen /= sizeof(*wordebuf);
348 do {
349 if (*++wordebuf != ~0)
350 break;
351 } while(--retlen);
352 c->mtd->unpoint(c->mtd, ebuf, jeb->offset, c->sector_size);
353 if (retlen)
354 printk(KERN_WARNING "Newly-erased block contained word 0x%lx at offset 0x%08tx\n",
355 *wordebuf, jeb->offset + c->sector_size-retlen*sizeof(*wordebuf));
356 return 0;
357 }
358 do_flash_read:
359 ebuf = kmalloc(PAGE_SIZE, GFP_KERNEL);
360 if (!ebuf) {
361 printk(KERN_WARNING "Failed to allocate page buffer for verifying erase at 0x%08x. Refiling\n", jeb->offset);
362 return -EAGAIN;
363 }
364
365 D1(printk(KERN_DEBUG "Verifying erase at 0x%08x\n", jeb->offset));
366
367 for (ofs = jeb->offset; ofs < jeb->offset + c->sector_size; ) {
368 uint32_t readlen = min((uint32_t)PAGE_SIZE, jeb->offset + c->sector_size - ofs);
369 int i;
370
371 *bad_offset = ofs;
372
373 ret = c->mtd->read(c->mtd, ofs, readlen, &retlen, ebuf);
374 if (ret) {
375 printk(KERN_WARNING "Read of newly-erased block at 0x%08x failed: %d. Putting on bad_list\n", ofs, ret);
376 goto fail;
377 }
378 if (retlen != readlen) {
379 printk(KERN_WARNING "Short read from newly-erased block at 0x%08x. Wanted %d, got %zd\n", ofs, readlen, retlen);
380 goto fail;
381 }
382 for (i=0; i<readlen; i += sizeof(unsigned long)) {
383 /* It's OK. We know it's properly aligned */
384 unsigned long *datum = ebuf + i;
385 if (*datum + 1) {
386 *bad_offset += i;
387 printk(KERN_WARNING "Newly-erased block contained word 0x%lx at offset 0x%08x\n", *datum, *bad_offset);
388 goto fail;
389 }
390 }
391 ofs += readlen;
392 cond_resched();
393 }
394 ret = 0;
395 fail:
396 kfree(ebuf);
397 return ret;
398 }
399
400 static void jffs2_mark_erased_block(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb)
401 {
402 size_t retlen;
403 int ret;
404 uint32_t uninitialized_var(bad_offset);
405
406 switch (jffs2_block_check_erase(c, jeb, &bad_offset)) {
407 case -EAGAIN: goto refile;
408 case -EIO: goto filebad;
409 }
410
411 /* Write the erase complete marker */
412 D1(printk(KERN_DEBUG "Writing erased marker to block at 0x%08x\n", jeb->offset));
413 bad_offset = jeb->offset;
414
415 /* Cleanmarker in oob area or no cleanmarker at all ? */
416 if (jffs2_cleanmarker_oob(c) || c->cleanmarker_size == 0) {
417
418 if (jffs2_cleanmarker_oob(c)) {
419 if (jffs2_write_nand_cleanmarker(c, jeb))
420 goto filebad;
421 }
422
423 /* Everything else got zeroed before the erase */
424 jeb->free_size = c->sector_size;
425 } else {
426
427 struct kvec vecs[1];
428 struct jffs2_unknown_node marker = {
429 .magic = cpu_to_je16(JFFS2_MAGIC_BITMASK),
430 .nodetype = cpu_to_je16(JFFS2_NODETYPE_CLEANMARKER),
431 .totlen = cpu_to_je32(c->cleanmarker_size)
432 };
433
434 jffs2_prealloc_raw_node_refs(c, jeb, 1);
435
436 marker.hdr_crc = cpu_to_je32(crc32(0, &marker, sizeof(struct jffs2_unknown_node)-4));
437
438 vecs[0].iov_base = (unsigned char *) &marker;
439 vecs[0].iov_len = sizeof(marker);
440 ret = jffs2_flash_direct_writev(c, vecs, 1, jeb->offset, &retlen);
441
442 if (ret || retlen != sizeof(marker)) {
443 if (ret)
444 printk(KERN_WARNING "Write clean marker to block at 0x%08x failed: %d\n",
445 jeb->offset, ret);
446 else
447 printk(KERN_WARNING "Short write to newly-erased block at 0x%08x: Wanted %zd, got %zd\n",
448 jeb->offset, sizeof(marker), retlen);
449
450 goto filebad;
451 }
452
453 /* Everything else got zeroed before the erase */
454 jeb->free_size = c->sector_size;
455 /* FIXME Special case for cleanmarker in empty block */
456 jffs2_link_node_ref(c, jeb, jeb->offset | REF_NORMAL, c->cleanmarker_size, NULL);
457 }
458
459 down(&c->erase_free_sem);
460 spin_lock(&c->erase_completion_lock);
461 c->erasing_size -= c->sector_size;
462 c->free_size += jeb->free_size;
463 c->used_size += jeb->used_size;
464
465 jffs2_dbg_acct_sanity_check_nolock(c,jeb);
466 jffs2_dbg_acct_paranoia_check_nolock(c, jeb);
467
468 list_add_tail(&jeb->list, &c->free_list);
469 c->nr_erasing_blocks--;
470 c->nr_free_blocks++;
471 spin_unlock(&c->erase_completion_lock);
472 up(&c->erase_free_sem);
473 wake_up(&c->erase_wait);
474 return;
475
476 filebad:
477 down(&c->erase_free_sem);
478 spin_lock(&c->erase_completion_lock);
479 /* Stick it on a list (any list) so erase_failed can take it
480 right off again. Silly, but shouldn't happen often. */
481 list_add(&jeb->list, &c->erasing_list);
482 spin_unlock(&c->erase_completion_lock);
483 up(&c->erase_free_sem);
484 jffs2_erase_failed(c, jeb, bad_offset);
485 return;
486
487 refile:
488 /* Stick it back on the list from whence it came and come back later */
489 jffs2_erase_pending_trigger(c);
490 down(&c->erase_free_sem);
491 spin_lock(&c->erase_completion_lock);
492 list_add(&jeb->list, &c->erase_complete_list);
493 spin_unlock(&c->erase_completion_lock);
494 up(&c->erase_free_sem);
495 return;
496 }
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