aboutsummaryrefslogtreecommitdiff
path: root/fs/jffs2/erase.c
blob: 83b8f06b4a642f3917b7720a2acd687854927ca3 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
/*
 * JFFS2 -- Journalling Flash File System, Version 2.
 *
 * Copyright © 2001-2007 Red Hat, Inc.
 * Copyright © 2004-2010 David Woodhouse <dwmw2@infradead.org>
 *
 * Created by David Woodhouse <dwmw2@infradead.org>
 *
 * For licensing information, see the file 'LICENCE' in this directory.
 *
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/mtd/mtd.h>
#include <linux/compiler.h>
#include <linux/crc32.h>
#include <linux/sched.h>
#include <linux/pagemap.h>
#include "nodelist.h"

static void jffs2_erase_failed(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, uint32_t bad_offset);
static void jffs2_erase_succeeded(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb);
static void jffs2_mark_erased_block(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb);

static void jffs2_erase_block(struct jffs2_sb_info *c,
			      struct jffs2_eraseblock *jeb)
{
	int ret;
	uint32_t bad_offset;
#ifdef __ECOS
       ret = jffs2_flash_erase(c, jeb);
       if (!ret) {
	       jffs2_erase_succeeded(c, jeb);
	       return;
       }
       bad_offset = jeb->offset;
#else /* Linux */
	struct erase_info *instr;

	jffs2_dbg(1, "%s(): erase block %#08x (range %#08x-%#08x)\n",
		  __func__,
		  jeb->offset, jeb->offset, jeb->offset + c->sector_size);
	instr = kmalloc(sizeof(struct erase_info), GFP_KERNEL);
	if (!instr) {
		pr_warn("kmalloc for struct erase_info in jffs2_erase_block failed. Refiling block for later\n");
		mutex_lock(&c->erase_free_sem);
		spin_lock(&c->erase_completion_lock);
		list_move(&jeb->list, &c->erase_pending_list);
		c->erasing_size -= c->sector_size;
		c->dirty_size += c->sector_size;
		jeb->dirty_size = c->sector_size;
		spin_unlock(&c->erase_completion_lock);
		mutex_unlock(&c->erase_free_sem);
		return;
	}

	memset(instr, 0, sizeof(*instr));

	instr->addr = jeb->offset;
	instr->len = c->sector_size;

	ret = mtd_erase(c->mtd, instr);
	if (!ret) {
		jffs2_erase_succeeded(c, jeb);
		kfree(instr);
		return;
	}

	bad_offset = instr->fail_addr;
	kfree(instr);
#endif /* __ECOS */

	if (ret == -ENOMEM || ret == -EAGAIN) {
		/* Erase failed immediately. Refile it on the list */
		jffs2_dbg(1, "Erase at 0x%08x failed: %d. Refiling on erase_pending_list\n",
			  jeb->offset, ret);
		mutex_lock(&c->erase_free_sem);
		spin_lock(&c->erase_completion_lock);
		list_move(&jeb->list, &c->erase_pending_list);
		c->erasing_size -= c->sector_size;
		c->dirty_size += c->sector_size;
		jeb->dirty_size = c->sector_size;
		spin_unlock(&c->erase_completion_lock);
		mutex_unlock(&c->erase_free_sem);
		return;
	}

	if (ret == -EROFS)
		pr_warn("Erase at 0x%08x failed immediately: -EROFS. Is the sector locked?\n",
			jeb->offset);
	else
		pr_warn("Erase at 0x%08x failed immediately: errno %d\n",
			jeb->offset, ret);

	jffs2_erase_failed(c, jeb, bad_offset);
}

int jffs2_erase_pending_blocks(struct jffs2_sb_info *c, int count)
{
	struct jffs2_eraseblock *jeb;
	int work_done = 0;

	mutex_lock(&c->erase_free_sem);

	spin_lock(&c->erase_completion_lock);

	while (!list_empty(&c->erase_complete_list) ||
	       !list_empty(&c->erase_pending_list)) {

		if (!list_empty(&c->erase_complete_list)) {
			jeb = list_entry(c->erase_complete_list.next, struct jffs2_eraseblock, list);
			list_move(&jeb->list, &c->erase_checking_list);
			spin_unlock(&c->erase_completion_lock);
			mutex_unlock(&c->erase_free_sem);
			jffs2_mark_erased_block(c, jeb);

			work_done++;
			if (!--count) {
				jffs2_dbg(1, "Count reached. jffs2_erase_pending_blocks leaving\n");
				goto done;
			}

		} else if (!list_empty(&c->erase_pending_list)) {
			jeb = list_entry(c->erase_pending_list.next, struct jffs2_eraseblock, list);
			jffs2_dbg(1, "Starting erase of pending block 0x%08x\n",
				  jeb->offset);
			list_del(&jeb->list);
			c->erasing_size += c->sector_size;
			c->wasted_size -= jeb->wasted_size;
			c->free_size -= jeb->free_size;
			c->used_size -= jeb->used_size;
			c->dirty_size -= jeb->dirty_size;
			jeb->wasted_size = jeb->used_size = jeb->dirty_size = jeb->free_size = 0;
			jffs2_free_jeb_node_refs(c, jeb);
			list_add(&jeb->list, &c->erasing_list);
			spin_unlock(&c->erase_completion_lock);
			mutex_unlock(&c->erase_free_sem);

			jffs2_erase_block(c, jeb);

		} else {
			BUG();
		}

		/* Be nice */
		cond_resched();
		mutex_lock(&c->erase_free_sem);
		spin_lock(&c->erase_completion_lock);
	}

	spin_unlock(&c->erase_completion_lock);
	mutex_unlock(&c->erase_free_sem);
 done:
	jffs2_dbg(1, "jffs2_erase_pending_blocks completed\n");
	return work_done;
}

static void jffs2_erase_succeeded(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb)
{
	jffs2_dbg(1, "Erase completed successfully at 0x%08x\n", jeb->offset);
	mutex_lock(&c->erase_free_sem);
	spin_lock(&c->erase_completion_lock);
	list_move_tail(&jeb->list, &c->erase_complete_list);
	/* Wake the GC thread to mark them clean */
	jffs2_garbage_collect_trigger(c);
	spin_unlock(&c->erase_completion_lock);
	mutex_unlock(&c->erase_free_sem);
	wake_up(&c->erase_wait);
}

static void jffs2_erase_failed(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, uint32_t bad_offset)
{
	/* For NAND, if the failure did not occur at the device level for a
	   specific physical page, don't bother updating the bad block table. */
	if (jffs2_cleanmarker_oob(c) && (bad_offset != (uint32_t)MTD_FAIL_ADDR_UNKNOWN)) {
		/* We had a device-level failure to erase.  Let's see if we've
		   failed too many times. */
		if (!jffs2_write_nand_badblock(c, jeb, bad_offset)) {
			/* We'd like to give this block another try. */
			mutex_lock(&c->erase_free_sem);
			spin_lock(&c->erase_completion_lock);
			list_move(&jeb->list, &c->erase_pending_list);
			c->erasing_size -= c->sector_size;
			c->dirty_size += c->sector_size;
			jeb->dirty_size = c->sector_size;
			spin_unlock(&c->erase_completion_lock);
			mutex_unlock(&c->erase_free_sem);
			return;
		}
	}

	mutex_lock(&c->erase_free_sem);
	spin_lock(&c->erase_completion_lock);
	c->erasing_size -= c->sector_size;
	c->bad_size += c->sector_size;
	list_move(&jeb->list, &c->bad_list);
	c->nr_erasing_blocks--;
	spin_unlock(&c->erase_completion_lock);
	mutex_unlock(&c->erase_free_sem);
	wake_up(&c->erase_wait);
}

/* Hmmm. Maybe we should accept the extra space it takes and make
   this a standard doubly-linked list? */
static inline void jffs2_remove_node_refs_from_ino_list(struct jffs2_sb_info *c,
			struct jffs2_raw_node_ref *ref, struct jffs2_eraseblock *jeb)
{
	struct jffs2_inode_cache *ic = NULL;
	struct jffs2_raw_node_ref **prev;

	prev = &ref->next_in_ino;

	/* Walk the inode's list once, removing any nodes from this eraseblock */
	while (1) {
		if (!(*prev)->next_in_ino) {
			/* We're looking at the jffs2_inode_cache, which is
			   at the end of the linked list. Stash it and continue
			   from the beginning of the list */
			ic = (struct jffs2_inode_cache *)(*prev);
			prev = &ic->nodes;
			continue;
		}

		if (SECTOR_ADDR((*prev)->flash_offset) == jeb->offset) {
			/* It's in the block we're erasing */
			struct jffs2_raw_node_ref *this;

			this = *prev;
			*prev = this->next_in_ino;
			this->next_in_ino = NULL;

			if (this == ref)
				break;

			continue;
		}
		/* Not to be deleted. Skip */
		prev = &((*prev)->next_in_ino);
	}

	/* PARANOIA */
	if (!ic) {
		JFFS2_WARNING("inode_cache/xattr_datum/xattr_ref"
			      " not found in remove_node_refs()!!\n");
		return;
	}

	jffs2_dbg(1, "Removed nodes in range 0x%08x-0x%08x from ino #%u\n",
		  jeb->offset, jeb->offset + c->sector_size, ic->ino);

	D2({
		int i=0;
		struct jffs2_raw_node_ref *this;
		printk(KERN_DEBUG "After remove_node_refs_from_ino_list: \n");

		this = ic->nodes;

		printk(KERN_DEBUG);
		while(this) {
			pr_cont("0x%08x(%d)->",
			       ref_offset(this), ref_flags(this));
			if (++i == 5) {
				printk(KERN_DEBUG);
				i=0;
			}
			this = this->next_in_ino;
		}
		pr_cont("\n");
	});

	switch (ic->class) {
#ifdef CONFIG_JFFS2_FS_XATTR
		case RAWNODE_CLASS_XATTR_DATUM:
			jffs2_release_xattr_datum(c, (struct jffs2_xattr_datum *)ic);
			break;
		case RAWNODE_CLASS_XATTR_REF:
			jffs2_release_xattr_ref(c, (struct jffs2_xattr_ref *)ic);
			break;
#endif
		default:
			if (ic->nodes == (void *)ic && ic->pino_nlink == 0)
				jffs2_del_ino_cache(c, ic);
	}
}

void jffs2_free_jeb_node_refs(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb)
{
	struct jffs2_raw_node_ref *block, *ref;
	jffs2_dbg(1, "Freeing all node refs for eraseblock offset 0x%08x\n",
		  jeb->offset);

	block = ref = jeb->first_node;

	while (ref) {
		if (ref->flash_offset == REF_LINK_NODE) {
			ref = ref->next_in_ino;
			jffs2_free_refblock(block);
			block = ref;
			continue;
		}
		if (ref->flash_offset != REF_EMPTY_NODE && ref->next_in_ino)
			jffs2_remove_node_refs_from_ino_list(c, ref, jeb);
		/* else it was a non-inode node or already removed, so don't bother */

		ref++;
	}
	jeb->first_node = jeb->last_node = NULL;
}

static int jffs2_block_check_erase(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, uint32_t *bad_offset)
{
	void *ebuf;
	uint32_t ofs;
	size_t retlen;
	int ret;
	unsigned long *wordebuf;

	ret = mtd_point(c->mtd, jeb->offset, c->sector_size, &retlen,
			&ebuf, NULL);
	if (ret != -EOPNOTSUPP) {
		if (ret) {
			jffs2_dbg(1, "MTD point failed %d\n", ret);
			goto do_flash_read;
		}
		if (retlen < c->sector_size) {
			/* Don't muck about if it won't let us point to the whole erase sector */
			jffs2_dbg(1, "MTD point returned len too short: 0x%zx\n",
				  retlen);
			mtd_unpoint(c->mtd, jeb->offset, retlen);
			goto do_flash_read;
		}
		wordebuf = ebuf-sizeof(*wordebuf);
		retlen /= sizeof(*wordebuf);
		do {
		   if (*++wordebuf != ~0)
			   break;
		} while(--retlen);
		mtd_unpoint(c->mtd, jeb->offset, c->sector_size);
		if (retlen) {
			pr_warn("Newly-erased block contained word 0x%lx at offset 0x%08tx\n",
				*wordebuf,
				jeb->offset +
				c->sector_size-retlen * sizeof(*wordebuf));
			return -EIO;
		}
		return 0;
	}
 do_flash_read:
	ebuf = kmalloc(PAGE_SIZE, GFP_KERNEL);
	if (!ebuf) {
		pr_warn("Failed to allocate page buffer for verifying erase at 0x%08x. Refiling\n",
			jeb->offset);
		return -EAGAIN;
	}

	jffs2_dbg(1, "Verifying erase at 0x%08x\n", jeb->offset);

	for (ofs = jeb->offset; ofs < jeb->offset + c->sector_size; ) {
		uint32_t readlen = min((uint32_t)PAGE_SIZE, jeb->offset + c->sector_size - ofs);
		int i;

		*bad_offset = ofs;

		ret = mtd_read(c->mtd, ofs, readlen, &retlen, ebuf);
		if (ret) {
			pr_warn("Read of newly-erased block at 0x%08x failed: %d. Putting on bad_list\n",
				ofs, ret);
			ret = -EIO;
			goto fail;
		}
		if (retlen != readlen) {
			pr_warn("Short read from newly-erased block at 0x%08x. Wanted %d, got %zd\n",
				ofs, readlen, retlen);
			ret = -EIO;
			goto fail;
		}
		for (i=0; i<readlen; i += sizeof(unsigned long)) {
			/* It's OK. We know it's properly aligned */
			unsigned long *datum = ebuf + i;
			if (*datum + 1) {
				*bad_offset += i;
				pr_warn("Newly-erased block contained word 0x%lx at offset 0x%08x\n",
					*datum, *bad_offset);
				ret = -EIO;
				goto fail;
			}
		}
		ofs += readlen;
		cond_resched();
	}
	ret = 0;
fail:
	kfree(ebuf);
	return ret;
}

static void jffs2_mark_erased_block(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb)
{
	size_t retlen;
	int ret;
	uint32_t uninitialized_var(bad_offset);

	switch (jffs2_block_check_erase(c, jeb, &bad_offset)) {
	case -EAGAIN:	goto refile;
	case -EIO:	goto filebad;
	}

	/* Write the erase complete marker */
	jffs2_dbg(1, "Writing erased marker to block at 0x%08x\n", jeb->offset);
	bad_offset = jeb->offset;

	/* Cleanmarker in oob area or no cleanmarker at all ? */
	if (jffs2_cleanmarker_oob(c) || c->cleanmarker_size == 0) {

		if (jffs2_cleanmarker_oob(c)) {
			if (jffs2_write_nand_cleanmarker(c, jeb))
				goto filebad;
		}
	} else {

		struct kvec vecs[1];
		struct jffs2_unknown_node marker = {
			.magic =	cpu_to_je16(JFFS2_MAGIC_BITMASK),
			.nodetype =	cpu_to_je16(JFFS2_NODETYPE_CLEANMARKER),
			.totlen =	cpu_to_je32(c->cleanmarker_size)
		};

		jffs2_prealloc_raw_node_refs(c, jeb, 1);

		marker.hdr_crc = cpu_to_je32(crc32(0, &marker, sizeof(struct jffs2_unknown_node)-4));

		vecs[0].iov_base = (unsigned char *) &marker;
		vecs[0].iov_len = sizeof(marker);
		ret = jffs2_flash_direct_writev(c, vecs, 1, jeb->offset, &retlen);

		if (ret || retlen != sizeof(marker)) {
			if (ret)
				pr_warn("Write clean marker to block at 0x%08x failed: %d\n",
				       jeb->offset, ret);
			else
				pr_warn("Short write to newly-erased block at 0x%08x: Wanted %zd, got %zd\n",
				       jeb->offset, sizeof(marker), retlen);

			goto filebad;
		}
	}
	/* Everything else got zeroed before the erase */
	jeb->free_size = c->sector_size;

	mutex_lock(&c->erase_free_sem);
	spin_lock(&c->erase_completion_lock);

	c->erasing_size -= c->sector_size;
	c->free_size += c->sector_size;

	/* Account for cleanmarker now, if it's in-band */
	if (c->cleanmarker_size && !jffs2_cleanmarker_oob(c))
		jffs2_link_node_ref(c, jeb, jeb->offset | REF_NORMAL, c->cleanmarker_size, NULL);

	list_move_tail(&jeb->list, &c->free_list);
	c->nr_erasing_blocks--;
	c->nr_free_blocks++;

	jffs2_dbg_acct_sanity_check_nolock(c, jeb);
	jffs2_dbg_acct_paranoia_check_nolock(c, jeb);

	spin_unlock(&c->erase_completion_lock);
	mutex_unlock(&c->erase_free_sem);
	wake_up(&c->erase_wait);
	return;

filebad:
	jffs2_erase_failed(c, jeb, bad_offset);
	return;

refile:
	/* Stick it back on the list from whence it came and come back later */
	mutex_lock(&c->erase_free_sem);
	spin_lock(&c->erase_completion_lock);
	jffs2_garbage_collect_trigger(c);
	list_move(&jeb->list, &c->erase_complete_list);
	spin_unlock(&c->erase_completion_lock);
	mutex_unlock(&c->erase_free_sem);
	return;
}