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1da177e4 LT |
1 | /* |
2 | * JFFS2 -- Journalling Flash File System, Version 2. | |
3 | * | |
4 | * Copyright (C) 2001-2003 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 | * | |
5d157885 | 10 | * $Id: erase.c,v 1.80 2005/07/14 19:46:24 joern Exp $ |
1da177e4 LT |
11 | * |
12 | */ | |
13 | ||
14 | #include <linux/kernel.h> | |
15 | #include <linux/slab.h> | |
16 | #include <linux/mtd/mtd.h> | |
17 | #include <linux/compiler.h> | |
18 | #include <linux/crc32.h> | |
19 | #include <linux/sched.h> | |
20 | #include <linux/pagemap.h> | |
21 | #include "nodelist.h" | |
22 | ||
23 | struct erase_priv_struct { | |
24 | struct jffs2_eraseblock *jeb; | |
25 | struct jffs2_sb_info *c; | |
26 | }; | |
27 | ||
28 | #ifndef __ECOS | |
29 | static void jffs2_erase_callback(struct erase_info *); | |
30 | #endif | |
31 | static void jffs2_erase_failed(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, uint32_t bad_offset); | |
32 | static void jffs2_erase_succeeded(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb); | |
33 | static void jffs2_free_all_node_refs(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb); | |
34 | static void jffs2_mark_erased_block(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb); | |
35 | ||
36 | static void jffs2_erase_block(struct jffs2_sb_info *c, | |
37 | struct jffs2_eraseblock *jeb) | |
38 | { | |
39 | int ret; | |
40 | uint32_t bad_offset; | |
41 | #ifdef __ECOS | |
42 | ret = jffs2_flash_erase(c, jeb); | |
43 | if (!ret) { | |
44 | jffs2_erase_succeeded(c, jeb); | |
45 | return; | |
46 | } | |
47 | bad_offset = jeb->offset; | |
48 | #else /* Linux */ | |
49 | struct erase_info *instr; | |
50 | ||
7d27c814 | 51 | D1(printk(KERN_DEBUG "jffs2_erase_block(): erase block %#x (range %#x-%#x)\n", jeb->offset, jeb->offset, jeb->offset + c->sector_size)); |
1da177e4 LT |
52 | instr = kmalloc(sizeof(struct erase_info) + sizeof(struct erase_priv_struct), GFP_KERNEL); |
53 | if (!instr) { | |
54 | printk(KERN_WARNING "kmalloc for struct erase_info in jffs2_erase_block failed. Refiling block for later\n"); | |
55 | spin_lock(&c->erase_completion_lock); | |
56 | list_del(&jeb->list); | |
57 | list_add(&jeb->list, &c->erase_pending_list); | |
58 | c->erasing_size -= c->sector_size; | |
59 | c->dirty_size += c->sector_size; | |
60 | jeb->dirty_size = c->sector_size; | |
61 | spin_unlock(&c->erase_completion_lock); | |
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 = 0xffffffff; | |
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 | spin_lock(&c->erase_completion_lock); | |
89 | list_del(&jeb->list); | |
90 | list_add(&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 | 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 | jffs2_mark_erased_block(c, jeb); | |
122 | ||
123 | if (!--count) { | |
124 | D1(printk(KERN_DEBUG "Count reached. jffs2_erase_pending_blocks leaving\n")); | |
125 | goto done; | |
126 | } | |
127 | ||
128 | } else if (!list_empty(&c->erase_pending_list)) { | |
129 | jeb = list_entry(c->erase_pending_list.next, struct jffs2_eraseblock, list); | |
130 | D1(printk(KERN_DEBUG "Starting erase of pending block 0x%08x\n", jeb->offset)); | |
131 | list_del(&jeb->list); | |
132 | c->erasing_size += c->sector_size; | |
133 | c->wasted_size -= jeb->wasted_size; | |
134 | c->free_size -= jeb->free_size; | |
135 | c->used_size -= jeb->used_size; | |
136 | c->dirty_size -= jeb->dirty_size; | |
137 | jeb->wasted_size = jeb->used_size = jeb->dirty_size = jeb->free_size = 0; | |
138 | jffs2_free_all_node_refs(c, jeb); | |
139 | list_add(&jeb->list, &c->erasing_list); | |
140 | spin_unlock(&c->erase_completion_lock); | |
141 | ||
142 | jffs2_erase_block(c, jeb); | |
143 | ||
144 | } else { | |
145 | BUG(); | |
146 | } | |
147 | ||
148 | /* Be nice */ | |
149 | cond_resched(); | |
150 | spin_lock(&c->erase_completion_lock); | |
151 | } | |
152 | ||
153 | spin_unlock(&c->erase_completion_lock); | |
154 | done: | |
155 | D1(printk(KERN_DEBUG "jffs2_erase_pending_blocks completed\n")); | |
156 | ||
157 | up(&c->erase_free_sem); | |
158 | } | |
159 | ||
160 | static void jffs2_erase_succeeded(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb) | |
161 | { | |
162 | D1(printk(KERN_DEBUG "Erase completed successfully at 0x%08x\n", jeb->offset)); | |
163 | spin_lock(&c->erase_completion_lock); | |
164 | list_del(&jeb->list); | |
165 | list_add_tail(&jeb->list, &c->erase_complete_list); | |
166 | spin_unlock(&c->erase_completion_lock); | |
167 | /* Ensure that kupdated calls us again to mark them clean */ | |
168 | jffs2_erase_pending_trigger(c); | |
169 | } | |
170 | ||
171 | static void jffs2_erase_failed(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, uint32_t bad_offset) | |
172 | { | |
173 | /* For NAND, if the failure did not occur at the device level for a | |
174 | specific physical page, don't bother updating the bad block table. */ | |
175 | if (jffs2_cleanmarker_oob(c) && (bad_offset != 0xffffffff)) { | |
176 | /* We had a device-level failure to erase. Let's see if we've | |
177 | failed too many times. */ | |
178 | if (!jffs2_write_nand_badblock(c, jeb, bad_offset)) { | |
179 | /* We'd like to give this block another try. */ | |
180 | spin_lock(&c->erase_completion_lock); | |
181 | list_del(&jeb->list); | |
182 | list_add(&jeb->list, &c->erase_pending_list); | |
183 | c->erasing_size -= c->sector_size; | |
184 | c->dirty_size += c->sector_size; | |
185 | jeb->dirty_size = c->sector_size; | |
186 | spin_unlock(&c->erase_completion_lock); | |
187 | return; | |
188 | } | |
189 | } | |
190 | ||
191 | spin_lock(&c->erase_completion_lock); | |
192 | c->erasing_size -= c->sector_size; | |
193 | c->bad_size += c->sector_size; | |
194 | list_del(&jeb->list); | |
195 | list_add(&jeb->list, &c->bad_list); | |
196 | c->nr_erasing_blocks--; | |
197 | spin_unlock(&c->erase_completion_lock); | |
198 | wake_up(&c->erase_wait); | |
199 | } | |
200 | ||
201 | #ifndef __ECOS | |
202 | static void jffs2_erase_callback(struct erase_info *instr) | |
203 | { | |
204 | struct erase_priv_struct *priv = (void *)instr->priv; | |
205 | ||
206 | if(instr->state != MTD_ERASE_DONE) { | |
207 | printk(KERN_WARNING "Erase at 0x%08x finished, but state != MTD_ERASE_DONE. State is 0x%x instead.\n", instr->addr, instr->state); | |
208 | jffs2_erase_failed(priv->c, priv->jeb, instr->fail_addr); | |
209 | } else { | |
210 | jffs2_erase_succeeded(priv->c, priv->jeb); | |
211 | } | |
212 | kfree(instr); | |
213 | } | |
214 | #endif /* !__ECOS */ | |
215 | ||
216 | /* Hmmm. Maybe we should accept the extra space it takes and make | |
217 | this a standard doubly-linked list? */ | |
218 | static inline void jffs2_remove_node_refs_from_ino_list(struct jffs2_sb_info *c, | |
219 | struct jffs2_raw_node_ref *ref, struct jffs2_eraseblock *jeb) | |
220 | { | |
221 | struct jffs2_inode_cache *ic = NULL; | |
222 | struct jffs2_raw_node_ref **prev; | |
223 | ||
224 | prev = &ref->next_in_ino; | |
225 | ||
226 | /* Walk the inode's list once, removing any nodes from this eraseblock */ | |
227 | while (1) { | |
228 | if (!(*prev)->next_in_ino) { | |
229 | /* We're looking at the jffs2_inode_cache, which is | |
230 | at the end of the linked list. Stash it and continue | |
231 | from the beginning of the list */ | |
232 | ic = (struct jffs2_inode_cache *)(*prev); | |
233 | prev = &ic->nodes; | |
234 | continue; | |
235 | } | |
236 | ||
3be36675 | 237 | if (SECTOR_ADDR((*prev)->flash_offset) == jeb->offset) { |
1da177e4 LT |
238 | /* It's in the block we're erasing */ |
239 | struct jffs2_raw_node_ref *this; | |
240 | ||
241 | this = *prev; | |
242 | *prev = this->next_in_ino; | |
243 | this->next_in_ino = NULL; | |
244 | ||
245 | if (this == ref) | |
246 | break; | |
247 | ||
248 | continue; | |
249 | } | |
250 | /* Not to be deleted. Skip */ | |
251 | prev = &((*prev)->next_in_ino); | |
252 | } | |
253 | ||
254 | /* PARANOIA */ | |
255 | if (!ic) { | |
256 | printk(KERN_WARNING "inode_cache not found in remove_node_refs()!!\n"); | |
257 | return; | |
258 | } | |
259 | ||
260 | D1(printk(KERN_DEBUG "Removed nodes in range 0x%08x-0x%08x from ino #%u\n", | |
261 | jeb->offset, jeb->offset + c->sector_size, ic->ino)); | |
262 | ||
263 | D2({ | |
264 | int i=0; | |
265 | struct jffs2_raw_node_ref *this; | |
266 | printk(KERN_DEBUG "After remove_node_refs_from_ino_list: \n" KERN_DEBUG); | |
267 | ||
268 | this = ic->nodes; | |
269 | ||
270 | while(this) { | |
271 | printk( "0x%08x(%d)->", ref_offset(this), ref_flags(this)); | |
272 | if (++i == 5) { | |
273 | printk("\n" KERN_DEBUG); | |
274 | i=0; | |
275 | } | |
276 | this = this->next_in_ino; | |
277 | } | |
278 | printk("\n"); | |
279 | }); | |
280 | ||
437316d9 | 281 | if (ic->nodes == (void *)ic && ic->nlink == 0) |
1da177e4 | 282 | jffs2_del_ino_cache(c, ic); |
1da177e4 LT |
283 | } |
284 | ||
285 | static void jffs2_free_all_node_refs(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb) | |
286 | { | |
287 | struct jffs2_raw_node_ref *ref; | |
288 | D1(printk(KERN_DEBUG "Freeing all node refs for eraseblock offset 0x%08x\n", jeb->offset)); | |
289 | while(jeb->first_node) { | |
290 | ref = jeb->first_node; | |
291 | jeb->first_node = ref->next_phys; | |
292 | ||
293 | /* Remove from the inode-list */ | |
294 | if (ref->next_in_ino) | |
295 | jffs2_remove_node_refs_from_ino_list(c, ref, jeb); | |
296 | /* else it was a non-inode node or already removed, so don't bother */ | |
297 | ||
298 | jffs2_free_raw_node_ref(ref); | |
299 | } | |
300 | jeb->last_node = NULL; | |
301 | } | |
302 | ||
5d157885 | 303 | static int jffs2_block_check_erase(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, uint32_t *bad_offset) |
1da177e4 | 304 | { |
5d157885 TG |
305 | void *ebuf; |
306 | uint32_t ofs; | |
1da177e4 | 307 | size_t retlen; |
5d157885 TG |
308 | int ret = -EIO; |
309 | ||
1da177e4 LT |
310 | ebuf = kmalloc(PAGE_SIZE, GFP_KERNEL); |
311 | if (!ebuf) { | |
5d157885 TG |
312 | printk(KERN_WARNING "Failed to allocate page buffer for verifying erase at 0x%08x. Refiling\n", jeb->offset); |
313 | return -EAGAIN; | |
314 | } | |
1da177e4 | 315 | |
5d157885 | 316 | D1(printk(KERN_DEBUG "Verifying erase at 0x%08x\n", jeb->offset)); |
1da177e4 | 317 | |
5d157885 TG |
318 | for (ofs = jeb->offset; ofs < jeb->offset + c->sector_size; ) { |
319 | uint32_t readlen = min((uint32_t)PAGE_SIZE, jeb->offset + c->sector_size - ofs); | |
320 | int i; | |
1da177e4 | 321 | |
5d157885 | 322 | *bad_offset = ofs; |
894214d1 | 323 | |
5d157885 TG |
324 | ret = jffs2_flash_read(c, ofs, readlen, &retlen, ebuf); |
325 | if (ret) { | |
326 | printk(KERN_WARNING "Read of newly-erased block at 0x%08x failed: %d. Putting on bad_list\n", ofs, ret); | |
327 | goto fail; | |
328 | } | |
329 | if (retlen != readlen) { | |
330 | printk(KERN_WARNING "Short read from newly-erased block at 0x%08x. Wanted %d, got %zd\n", ofs, readlen, retlen); | |
331 | goto fail; | |
332 | } | |
333 | for (i=0; i<readlen; i += sizeof(unsigned long)) { | |
334 | /* It's OK. We know it's properly aligned */ | |
335 | unsigned long *datum = ebuf + i; | |
336 | if (*datum + 1) { | |
337 | *bad_offset += i; | |
338 | printk(KERN_WARNING "Newly-erased block contained word 0x%lx at offset 0x%08x\n", *datum, *bad_offset); | |
339 | goto fail; | |
1da177e4 | 340 | } |
1da177e4 | 341 | } |
5d157885 TG |
342 | ofs += readlen; |
343 | cond_resched(); | |
1da177e4 | 344 | } |
5d157885 TG |
345 | ret = 0; |
346 | fail: | |
347 | kfree(ebuf); | |
348 | return ret; | |
349 | } | |
1da177e4 | 350 | |
5d157885 TG |
351 | static void jffs2_mark_erased_block(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb) |
352 | { | |
353 | struct jffs2_raw_node_ref *marker_ref = NULL; | |
354 | size_t retlen; | |
355 | int ret; | |
356 | uint32_t bad_offset; | |
357 | ||
358 | switch (jffs2_block_check_erase(c, jeb, &bad_offset)) { | |
359 | case -EAGAIN: goto refile; | |
360 | case -EIO: goto filebad; | |
361 | } | |
1da177e4 LT |
362 | |
363 | /* Write the erase complete marker */ | |
364 | D1(printk(KERN_DEBUG "Writing erased marker to block at 0x%08x\n", jeb->offset)); | |
5d157885 | 365 | bad_offset = jeb->offset; |
1da177e4 | 366 | |
5d157885 TG |
367 | /* Cleanmarker in oob area or no cleanmarker at all ? */ |
368 | if (jffs2_cleanmarker_oob(c) || c->cleanmarker_size == 0) { | |
1da177e4 | 369 | |
5d157885 TG |
370 | if (jffs2_cleanmarker_oob(c)) { |
371 | if (jffs2_write_nand_cleanmarker(c, jeb)) | |
372 | goto filebad; | |
373 | } | |
8f15fd55 | 374 | |
5d157885 | 375 | jeb->first_node = jeb->last_node = NULL; |
1da177e4 LT |
376 | jeb->free_size = c->sector_size; |
377 | jeb->used_size = 0; | |
378 | jeb->dirty_size = 0; | |
379 | jeb->wasted_size = 0; | |
5d157885 | 380 | |
1da177e4 | 381 | } else { |
5d157885 | 382 | |
1da177e4 LT |
383 | struct kvec vecs[1]; |
384 | struct jffs2_unknown_node marker = { | |
385 | .magic = cpu_to_je16(JFFS2_MAGIC_BITMASK), | |
386 | .nodetype = cpu_to_je16(JFFS2_NODETYPE_CLEANMARKER), | |
387 | .totlen = cpu_to_je32(c->cleanmarker_size) | |
388 | }; | |
389 | ||
5d157885 TG |
390 | marker_ref = jffs2_alloc_raw_node_ref(); |
391 | if (!marker_ref) { | |
392 | printk(KERN_WARNING "Failed to allocate raw node ref for clean marker. Refiling\n"); | |
393 | goto refile; | |
394 | } | |
395 | ||
1da177e4 LT |
396 | marker.hdr_crc = cpu_to_je32(crc32(0, &marker, sizeof(struct jffs2_unknown_node)-4)); |
397 | ||
398 | vecs[0].iov_base = (unsigned char *) ▮ | |
399 | vecs[0].iov_len = sizeof(marker); | |
400 | ret = jffs2_flash_direct_writev(c, vecs, 1, jeb->offset, &retlen); | |
401 | ||
5d157885 TG |
402 | if (ret || retlen != sizeof(marker)) { |
403 | if (ret) | |
404 | printk(KERN_WARNING "Write clean marker to block at 0x%08x failed: %d\n", | |
405 | jeb->offset, ret); | |
406 | else | |
407 | printk(KERN_WARNING "Short write to newly-erased block at 0x%08x: Wanted %zd, got %zd\n", | |
408 | jeb->offset, sizeof(marker), retlen); | |
409 | ||
410 | jffs2_free_raw_node_ref(marker_ref); | |
411 | goto filebad; | |
1da177e4 LT |
412 | } |
413 | ||
414 | marker_ref->next_in_ino = NULL; | |
415 | marker_ref->next_phys = NULL; | |
416 | marker_ref->flash_offset = jeb->offset | REF_NORMAL; | |
417 | marker_ref->__totlen = c->cleanmarker_size; | |
418 | ||
419 | jeb->first_node = jeb->last_node = marker_ref; | |
420 | ||
421 | jeb->free_size = c->sector_size - c->cleanmarker_size; | |
422 | jeb->used_size = c->cleanmarker_size; | |
423 | jeb->dirty_size = 0; | |
424 | jeb->wasted_size = 0; | |
425 | } | |
426 | ||
427 | spin_lock(&c->erase_completion_lock); | |
428 | c->erasing_size -= c->sector_size; | |
429 | c->free_size += jeb->free_size; | |
430 | c->used_size += jeb->used_size; | |
431 | ||
432 | ACCT_SANITY_CHECK(c,jeb); | |
433 | D1(ACCT_PARANOIA_CHECK(jeb)); | |
434 | ||
435 | list_add_tail(&jeb->list, &c->free_list); | |
436 | c->nr_erasing_blocks--; | |
437 | c->nr_free_blocks++; | |
438 | spin_unlock(&c->erase_completion_lock); | |
439 | wake_up(&c->erase_wait); | |
5d157885 TG |
440 | return; |
441 | ||
442 | filebad: | |
443 | spin_lock(&c->erase_completion_lock); | |
444 | /* Stick it on a list (any list) so erase_failed can take it | |
445 | right off again. Silly, but shouldn't happen often. */ | |
446 | list_add(&jeb->list, &c->erasing_list); | |
447 | spin_unlock(&c->erase_completion_lock); | |
448 | jffs2_erase_failed(c, jeb, bad_offset); | |
449 | return; | |
1da177e4 | 450 | |
5d157885 TG |
451 | refile: |
452 | /* Stick it back on the list from whence it came and come back later */ | |
453 | jffs2_erase_pending_trigger(c); | |
454 | spin_lock(&c->erase_completion_lock); | |
455 | list_add(&jeb->list, &c->erase_complete_list); | |
456 | spin_unlock(&c->erase_completion_lock); | |
457 | return; | |
458 | } |