erase.c 13.0 KB
Newer Older
L
Linus Torvalds 已提交
1 2 3
/*
 * JFFS2 -- Journalling Flash File System, Version 2.
 *
4
 * Copyright © 2001-2007 Red Hat, Inc.
L
Linus Torvalds 已提交
5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
 *
 * Created by David Woodhouse <dwmw2@infradead.org>
 *
 * For licensing information, see the file 'LICENCE' in this directory.
 *
 */

#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"

struct erase_priv_struct {
	struct jffs2_eraseblock *jeb;
	struct jffs2_sb_info *c;
};
25

L
Linus Torvalds 已提交
26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47
#ifndef __ECOS
static void jffs2_erase_callback(struct erase_info *);
#endif
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;

48 49
	D1(printk(KERN_DEBUG "jffs2_erase_block(): erase block %#08x (range %#08x-%#08x)\n",
				jeb->offset, jeb->offset, jeb->offset + c->sector_size));
L
Linus Torvalds 已提交
50 51 52 53
	instr = kmalloc(sizeof(struct erase_info) + sizeof(struct erase_priv_struct), GFP_KERNEL);
	if (!instr) {
		printk(KERN_WARNING "kmalloc for struct erase_info in jffs2_erase_block failed. Refiling block for later\n");
		spin_lock(&c->erase_completion_lock);
A
Akinobu Mita 已提交
54
		list_move(&jeb->list, &c->erase_pending_list);
L
Linus Torvalds 已提交
55 56 57 58 59 60 61 62 63 64 65 66 67 68 69
		c->erasing_size -= c->sector_size;
		c->dirty_size += c->sector_size;
		jeb->dirty_size = c->sector_size;
		spin_unlock(&c->erase_completion_lock);
		return;
	}

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

	instr->mtd = c->mtd;
	instr->addr = jeb->offset;
	instr->len = c->sector_size;
	instr->callback = jffs2_erase_callback;
	instr->priv = (unsigned long)(&instr[1]);
	instr->fail_addr = 0xffffffff;
70

L
Linus Torvalds 已提交
71 72 73 74 75 76 77 78 79 80 81 82 83 84 85
	((struct erase_priv_struct *)instr->priv)->jeb = jeb;
	((struct erase_priv_struct *)instr->priv)->c = c;

	ret = c->mtd->erase(c->mtd, instr);
	if (!ret)
		return;

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

	if (ret == -ENOMEM || ret == -EAGAIN) {
		/* Erase failed immediately. Refile it on the list */
		D1(printk(KERN_DEBUG "Erase at 0x%08x failed: %d. Refiling on erase_pending_list\n", jeb->offset, ret));
		spin_lock(&c->erase_completion_lock);
A
Akinobu Mita 已提交
86
		list_move(&jeb->list, &c->erase_pending_list);
L
Linus Torvalds 已提交
87 88 89 90 91 92 93
		c->erasing_size -= c->sector_size;
		c->dirty_size += c->sector_size;
		jeb->dirty_size = c->sector_size;
		spin_unlock(&c->erase_completion_lock);
		return;
	}

94
	if (ret == -EROFS)
L
Linus Torvalds 已提交
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
		printk(KERN_WARNING "Erase at 0x%08x failed immediately: -EROFS. Is the sector locked?\n", jeb->offset);
	else
		printk(KERN_WARNING "Erase at 0x%08x failed immediately: errno %d\n", jeb->offset, ret);

	jffs2_erase_failed(c, jeb, bad_offset);
}

void jffs2_erase_pending_blocks(struct jffs2_sb_info *c, int count)
{
	struct jffs2_eraseblock *jeb;

	down(&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_del(&jeb->list);
			spin_unlock(&c->erase_completion_lock);
			jffs2_mark_erased_block(c, jeb);

			if (!--count) {
				D1(printk(KERN_DEBUG "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);
			D1(printk(KERN_DEBUG "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;
134
			jffs2_free_jeb_node_refs(c, jeb);
L
Linus Torvalds 已提交
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
			list_add(&jeb->list, &c->erasing_list);
			spin_unlock(&c->erase_completion_lock);

			jffs2_erase_block(c, jeb);

		} else {
			BUG();
		}

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

	spin_unlock(&c->erase_completion_lock);
 done:
	D1(printk(KERN_DEBUG "jffs2_erase_pending_blocks completed\n"));

	up(&c->erase_free_sem);
}

static void jffs2_erase_succeeded(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb)
{
	D1(printk(KERN_DEBUG "Erase completed successfully at 0x%08x\n", jeb->offset));
	spin_lock(&c->erase_completion_lock);
A
Akinobu Mita 已提交
160
	list_move_tail(&jeb->list, &c->erase_complete_list);
L
Linus Torvalds 已提交
161 162 163 164 165 166 167 168 169 170 171 172 173 174 175
	spin_unlock(&c->erase_completion_lock);
	/* Ensure that kupdated calls us again to mark them clean */
	jffs2_erase_pending_trigger(c);
}

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 != 0xffffffff)) {
		/* 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. */
			spin_lock(&c->erase_completion_lock);
A
Akinobu Mita 已提交
176
			list_move(&jeb->list, &c->erase_pending_list);
L
Linus Torvalds 已提交
177 178 179 180 181 182 183 184 185 186 187
			c->erasing_size -= c->sector_size;
			c->dirty_size += c->sector_size;
			jeb->dirty_size = c->sector_size;
			spin_unlock(&c->erase_completion_lock);
			return;
		}
	}

	spin_lock(&c->erase_completion_lock);
	c->erasing_size -= c->sector_size;
	c->bad_size += c->sector_size;
A
Akinobu Mita 已提交
188
	list_move(&jeb->list, &c->bad_list);
L
Linus Torvalds 已提交
189 190 191
	c->nr_erasing_blocks--;
	spin_unlock(&c->erase_completion_lock);
	wake_up(&c->erase_wait);
192
}
L
Linus Torvalds 已提交
193 194 195 196 197 198 199 200 201 202 203

#ifndef __ECOS
static void jffs2_erase_callback(struct erase_info *instr)
{
	struct erase_priv_struct *priv = (void *)instr->priv;

	if(instr->state != MTD_ERASE_DONE) {
		printk(KERN_WARNING "Erase at 0x%08x finished, but state != MTD_ERASE_DONE. State is 0x%x instead.\n", instr->addr, instr->state);
		jffs2_erase_failed(priv->c, priv->jeb, instr->fail_addr);
	} else {
		jffs2_erase_succeeded(priv->c, priv->jeb);
204
	}
L
Linus Torvalds 已提交
205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221
	kfree(instr);
}
#endif /* !__ECOS */

/* 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) {
222
			/* We're looking at the jffs2_inode_cache, which is
L
Linus Torvalds 已提交
223 224 225 226 227
			   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;
228
		}
L
Linus Torvalds 已提交
229

230
		if (SECTOR_ADDR((*prev)->flash_offset) == jeb->offset) {
L
Linus Torvalds 已提交
231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248
			/* 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) {
249 250
		JFFS2_WARNING("inode_cache/xattr_datum/xattr_ref"
			      " not found in remove_node_refs()!!\n");
L
Linus Torvalds 已提交
251 252 253 254 255 256 257 258 259 260 261 262
		return;
	}

	D1(printk(KERN_DEBUG "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" KERN_DEBUG);

		this = ic->nodes;
263

L
Linus Torvalds 已提交
264 265 266 267 268 269 270 271 272 273 274
		while(this) {
			printk( "0x%08x(%d)->", ref_offset(this), ref_flags(this));
			if (++i == 5) {
				printk("\n" KERN_DEBUG);
				i=0;
			}
			this = this->next_in_ino;
		}
		printk("\n");
	});

275 276 277 278 279 280 281 282 283 284 285 286 287
	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->nlink == 0)
				jffs2_del_ino_cache(c, ic);
	}
L
Linus Torvalds 已提交
288 289
}

290
void jffs2_free_jeb_node_refs(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb)
L
Linus Torvalds 已提交
291
{
292
	struct jffs2_raw_node_ref *block, *ref;
L
Linus Torvalds 已提交
293
	D1(printk(KERN_DEBUG "Freeing all node refs for eraseblock offset 0x%08x\n", jeb->offset));
294

295 296 297 298 299 300 301 302 303 304
	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)
L
Linus Torvalds 已提交
305 306 307
			jffs2_remove_node_refs_from_ino_list(c, ref, jeb);
		/* else it was a non-inode node or already removed, so don't bother */

308
		ref++;
L
Linus Torvalds 已提交
309
	}
310
	jeb->first_node = jeb->last_node = NULL;
L
Linus Torvalds 已提交
311 312
}

313
static int jffs2_block_check_erase(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, uint32_t *bad_offset)
L
Linus Torvalds 已提交
314
{
315 316
	void *ebuf;
	uint32_t ofs;
L
Linus Torvalds 已提交
317
	size_t retlen;
318
	int ret = -EIO;
319

L
Linus Torvalds 已提交
320 321
	ebuf = kmalloc(PAGE_SIZE, GFP_KERNEL);
	if (!ebuf) {
322 323 324
		printk(KERN_WARNING "Failed to allocate page buffer for verifying erase at 0x%08x. Refiling\n", jeb->offset);
		return -EAGAIN;
	}
L
Linus Torvalds 已提交
325

326
	D1(printk(KERN_DEBUG "Verifying erase at 0x%08x\n", jeb->offset));
L
Linus Torvalds 已提交
327

328 329 330
	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;
L
Linus Torvalds 已提交
331

332
		*bad_offset = ofs;
333

334
		ret = c->mtd->read(c->mtd, ofs, readlen, &retlen, ebuf);
335 336 337 338 339 340 341 342 343 344 345 346 347 348 349
		if (ret) {
			printk(KERN_WARNING "Read of newly-erased block at 0x%08x failed: %d. Putting on bad_list\n", ofs, ret);
			goto fail;
		}
		if (retlen != readlen) {
			printk(KERN_WARNING "Short read from newly-erased block at 0x%08x. Wanted %d, got %zd\n", ofs, readlen, retlen);
			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;
				printk(KERN_WARNING "Newly-erased block contained word 0x%lx at offset 0x%08x\n", *datum, *bad_offset);
				goto fail;
L
Linus Torvalds 已提交
350 351
			}
		}
352 353
		ofs += readlen;
		cond_resched();
L
Linus Torvalds 已提交
354
	}
355 356 357 358 359
	ret = 0;
fail:
	kfree(ebuf);
	return ret;
}
L
Linus Torvalds 已提交
360

361 362 363 364 365 366 367 368 369 370
static void jffs2_mark_erased_block(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb)
{
	size_t retlen;
	int ret;
	uint32_t bad_offset;

	switch (jffs2_block_check_erase(c, jeb, &bad_offset)) {
	case -EAGAIN:	goto refile;
	case -EIO:	goto filebad;
	}
L
Linus Torvalds 已提交
371

372
	/* Write the erase complete marker */
L
Linus Torvalds 已提交
373
	D1(printk(KERN_DEBUG "Writing erased marker to block at 0x%08x\n", jeb->offset));
374
	bad_offset = jeb->offset;
L
Linus Torvalds 已提交
375

376 377
	/* Cleanmarker in oob area or no cleanmarker at all ? */
	if (jffs2_cleanmarker_oob(c) || c->cleanmarker_size == 0) {
L
Linus Torvalds 已提交
378

379 380 381 382
		if (jffs2_cleanmarker_oob(c)) {
			if (jffs2_write_nand_cleanmarker(c, jeb))
				goto filebad;
		}
383

384
		/* Everything else got zeroed before the erase */
L
Linus Torvalds 已提交
385 386
		jeb->free_size = c->sector_size;
	} else {
387

L
Linus Torvalds 已提交
388 389 390 391 392 393 394
		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)
		};

395
		jffs2_prealloc_raw_node_refs(c, jeb, 1);
396

L
Linus Torvalds 已提交
397 398 399 400 401
		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);
402

403 404 405 406 407 408 409 410 411
		if (ret || retlen != sizeof(marker)) {
			if (ret)
				printk(KERN_WARNING "Write clean marker to block at 0x%08x failed: %d\n",
				       jeb->offset, ret);
			else
				printk(KERN_WARNING "Short write to newly-erased block at 0x%08x: Wanted %zd, got %zd\n",
				       jeb->offset, sizeof(marker), retlen);

			goto filebad;
L
Linus Torvalds 已提交
412 413
		}

414 415
		/* Everything else got zeroed before the erase */
		jeb->free_size = c->sector_size;
416 417
		/* FIXME Special case for cleanmarker in empty block */
		jffs2_link_node_ref(c, jeb, jeb->offset | REF_NORMAL, c->cleanmarker_size, NULL);
L
Linus Torvalds 已提交
418 419 420 421 422 423 424
	}

	spin_lock(&c->erase_completion_lock);
	c->erasing_size -= c->sector_size;
	c->free_size += jeb->free_size;
	c->used_size += jeb->used_size;

425 426
	jffs2_dbg_acct_sanity_check_nolock(c,jeb);
	jffs2_dbg_acct_paranoia_check_nolock(c, jeb);
L
Linus Torvalds 已提交
427 428 429 430 431 432

	list_add_tail(&jeb->list, &c->free_list);
	c->nr_erasing_blocks--;
	c->nr_free_blocks++;
	spin_unlock(&c->erase_completion_lock);
	wake_up(&c->erase_wait);
433 434 435 436 437 438 439 440 441 442
	return;

filebad:
	spin_lock(&c->erase_completion_lock);
	/* Stick it on a list (any list) so erase_failed can take it
	   right off again.  Silly, but shouldn't happen often. */
	list_add(&jeb->list, &c->erasing_list);
	spin_unlock(&c->erase_completion_lock);
	jffs2_erase_failed(c, jeb, bad_offset);
	return;
L
Linus Torvalds 已提交
443

444 445 446 447 448 449 450 451
refile:
	/* Stick it back on the list from whence it came and come back later */
	jffs2_erase_pending_trigger(c);
	spin_lock(&c->erase_completion_lock);
	list_add(&jeb->list, &c->erase_complete_list);
	spin_unlock(&c->erase_completion_lock);
	return;
}