fs/jffs2.org/erase.c

   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@redhat.com>
   7  *
   8  * For licensing information, see the file 'LICENCE' in this directory.
   9  *
  10  * $Id: erase.c,v 1.60 2004/06/30 17:26:15 dbrown Exp $
  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 void jffs2_erase_block(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb)
  37 {
  38         int ret;
  39         uint32_t bad_offset;
  40 #ifdef __ECOS
  41        ret = jffs2_flash_erase(c, jeb);
  42        if (!ret) {
  43                jffs2_erase_succeeded(c, jeb);
  44                return;
  45        }
  46 #else /* Linux */
  47         struct erase_info *instr;
  48
  49         instr = kmalloc(sizeof(struct erase_info) + sizeof(struct erase_priv_struct), GFP_KERNEL);
  50         if (!instr) {
  51                 printk(KERN_WARNING "kmalloc for struct erase_info in jffs2_erase_block failed. Refiling block for later\n");
  52                 spin_lock(&c->erase_completion_lock);
  53                 list_del(&jeb->list);
  54                 list_add(&jeb->list, &c->erase_pending_list);
  55                 c->erasing_size -= c->sector_size;
  56                 c->dirty_size += c->sector_size;
  57                 jeb->dirty_size = c->sector_size;
  58                 spin_unlock(&c->erase_completion_lock);
  59                 return;
  60         }
  61
  62         memset(instr, 0, sizeof(*instr));
  63
  64         instr->mtd = c->mtd;
  65         instr->addr = jeb->offset;
  66         instr->len = c->sector_size;
  67         instr->callback = jffs2_erase_callback;
  68         instr->priv = (unsigned long)(&instr[1]);
  69         instr->fail_addr = 0xffffffff;
  70
  71         ((struct erase_priv_struct *)instr->priv)->jeb = jeb;
  72         ((struct erase_priv_struct *)instr->priv)->c = c;
  73
  74         ret = c->mtd->erase(c->mtd, instr);
  75         if (!ret)
  76                 return;
  77
  78         bad_offset = instr->fail_addr;
  79         kfree(instr);
  80 #endif /* __ECOS */
  81
  82         if (ret == -ENOMEM || ret == -EAGAIN) {
  83                 /* Erase failed immediately. Refile it on the list */
  84                 D1(printk(KERN_DEBUG "Erase at 0x%08x failed: %d. Refiling on erase_pending_list\n", jeb->offset, ret));
  85                 spin_lock(&c->erase_completion_lock);
  86                 list_del(&jeb->list);
  87                 list_add(&jeb->list, &c->erase_pending_list);
  88                 c->erasing_size -= c->sector_size;
  89                 c->dirty_size += c->sector_size;
  90                 jeb->dirty_size = c->sector_size;
  91                 spin_unlock(&c->erase_completion_lock);
  92                 return;
  93         }
  94
  95         if (ret == -EROFS)
  96                 printk(KERN_WARNING "Erase at 0x%08x failed immediately: -EROFS. Is the sector locked?\n", jeb->offset);
  97         else
  98                 printk(KERN_WARNING "Erase at 0x%08x failed immediately: errno %d\n", jeb->offset, ret);
  99
 100         jffs2_erase_failed(c, jeb, bad_offset);
 101 }
 102
 103 void jffs2_erase_pending_blocks(struct jffs2_sb_info *c, int count)
 104 {
 105         struct jffs2_eraseblock *jeb;
 106
 107         down(&c->erase_free_sem);
 108
 109         spin_lock(&c->erase_completion_lock);
 110
 111         while (!list_empty(&c->erase_complete_list) ||
 112                !list_empty(&c->erase_pending_list)) {
 113
 114                 if (!list_empty(&c->erase_complete_list)) {
 115                         jeb = list_entry(c->erase_complete_list.next, struct jffs2_eraseblock, list);
 116                         list_del(&jeb->list);
 117                         spin_unlock(&c->erase_completion_lock);
 118                         jffs2_mark_erased_block(c, jeb);
 119
 120                         if (!--count) {
 121                                 D1(printk(KERN_DEBUG "Count reached. jffs2_erase_pending_blocks leaving\n"));
 122                                 goto done;
 123                         }
 124
 125                 } else if (!list_empty(&c->erase_pending_list)) {
 126                         jeb = list_entry(c->erase_pending_list.next, struct jffs2_eraseblock, list);
 127                         D1(printk(KERN_DEBUG "Starting erase of pending block 0x%08x\n", jeb->offset));
 128                         list_del(&jeb->list);
 129                         c->erasing_size += c->sector_size;
 130                         c->wasted_size -= jeb->wasted_size;
 131                         c->free_size -= jeb->free_size;
 132                         c->used_size -= jeb->used_size;
 133                         c->dirty_size -= jeb->dirty_size;
 134                         jeb->wasted_size = jeb->used_size = jeb->dirty_size = jeb->free_size = 0;
 135                         jffs2_free_all_node_refs(c, jeb);
 136                         list_add(&jeb->list, &c->erasing_list);
 137                         spin_unlock(&c->erase_completion_lock);
 138
 139                         jffs2_erase_block(c, jeb);
 140
 141                 } else {
 142                         BUG();
 143                 }
 144
 145                 /* Be nice */
 146                 cond_resched();
 147                 spin_lock(&c->erase_completion_lock);
 148         }
 149
 150         spin_unlock(&c->erase_completion_lock);
 151  done:
 152         D1(printk(KERN_DEBUG "jffs2_erase_pending_blocks completed\n"));
 153
 154         up(&c->erase_free_sem);
 155 }
 156
 157 static void jffs2_erase_succeeded(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb)
 158 {
 159         D1(printk(KERN_DEBUG "Erase completed successfully at 0x%08x\n", jeb->offset));
 160         spin_lock(&c->erase_completion_lock);
 161         list_del(&jeb->list);
 162         list_add_tail(&jeb->list, &c->erase_complete_list);
 163         spin_unlock(&c->erase_completion_lock);
 164         /* Ensure that kupdated calls us again to mark them clean */
 165         jffs2_erase_pending_trigger(c);
 166 }
 167
 168 static void jffs2_erase_failed(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, uint32_t bad_offset)
 169 {
 170         /* For NAND, if the failure did not occur at the device level for a
 171            specific physical page, don't bother updating the bad block table. */
 172         if (jffs2_cleanmarker_oob(c) && (bad_offset != 0xffffffff)) {
 173                 /* We had a device-level failure to erase.  Let's see if we've
 174                    failed too many times. */
 175                 if (!jffs2_write_nand_badblock(c, jeb, bad_offset)) {
 176                         /* We'd like to give this block another try. */
 177                         spin_lock(&c->erase_completion_lock);
 178                         list_del(&jeb->list);
 179                         list_add(&jeb->list, &c->erase_pending_list);
 180                         c->erasing_size -= c->sector_size;
 181                         c->dirty_size += c->sector_size;
 182                         jeb->dirty_size = c->sector_size;
 183                         spin_unlock(&c->erase_completion_lock);
 184                         return;
 185                 }
 186         }
 187
 188         spin_lock(&c->erase_completion_lock);
 189         c->erasing_size -= c->sector_size;
 190         c->bad_size += c->sector_size;
 191         list_del(&jeb->list);
 192         list_add(&jeb->list, &c->bad_list);
 193         c->nr_erasing_blocks--;
 194         spin_unlock(&c->erase_completion_lock);
 195         wake_up(&c->erase_wait);
 196 }
 197
 198 #ifndef __ECOS
 199 static void jffs2_erase_callback(struct erase_info *instr)
 200 {
 201         struct erase_priv_struct *priv = (void *)instr->priv;
 202
 203         if(instr->state != MTD_ERASE_DONE) {
 204                 printk(KERN_WARNING "Erase at 0x%08x finished, but state != MTD_ERASE_DONE. State is 0x%x instead.\n", instr->addr, instr->state);
 205                 jffs2_erase_failed(priv->c, priv->jeb, instr->fail_addr);
 206         } else {
 207                 jffs2_erase_succeeded(priv->c, priv->jeb);
 208         }
 209         kfree(instr);
 210 }
 211 #endif /* !__ECOS */
 212
 213 /* Hmmm. Maybe we should accept the extra space it takes and make
 214    this a standard doubly-linked list? */
 215 static inline void jffs2_remove_node_refs_from_ino_list(struct jffs2_sb_info *c,
 216                         struct jffs2_raw_node_ref *ref, struct jffs2_eraseblock *jeb)
 217 {
 218         struct jffs2_inode_cache *ic = NULL;
 219         struct jffs2_raw_node_ref **prev;
 220
 221         prev = &ref->next_in_ino;
 222
 223         /* Walk the inode's list once, removing any nodes from this eraseblock */
 224         while (1) {
 225                 if (!(*prev)->next_in_ino) {
 226                         /* We're looking at the jffs2_inode_cache, which is
 227                            at the end of the linked list. Stash it and continue
 228                            from the beginning of the list */
 229                         ic = (struct jffs2_inode_cache *)(*prev);
 230                         prev = &ic->nodes;
 231                         continue;
 232                 }
 233
 234                 if (((*prev)->flash_offset & ~(c->sector_size -1)) == jeb->offset) {
 235                         /* It's in the block we're erasing */
 236                         struct jffs2_raw_node_ref *this;
 237
 238                         this = *prev;
 239                         *prev = this->next_in_ino;
 240                         this->next_in_ino = NULL;
 241
 242                         if (this == ref)
 243                                 break;
 244
 245                         continue;
 246                 }
 247                 /* Not to be deleted. Skip */
 248                 prev = &((*prev)->next_in_ino);
 249         }
 250
 251         /* PARANOIA */
 252         if (!ic) {
 253                 printk(KERN_WARNING "inode_cache not found in remove_node_refs()!!\n");
 254                 return;
 255         }
 256
 257         D1(printk(KERN_DEBUG "Removed nodes in range 0x%08x-0x%08x from ino #%u\n",
 258                   jeb->offset, jeb->offset + c->sector_size, ic->ino));
 259
 260         D2({
 261                 int i=0;
 262                 struct jffs2_raw_node_ref *this;
 263                 printk(KERN_DEBUG "After remove_node_refs_from_ino_list: \n" KERN_DEBUG);
 264
 265                 this = ic->nodes;
 266
 267                 while(this) {
 268                         printk( "0x%08x(%d)->", ref_offset(this), ref_flags(this));
 269                         if (++i == 5) {
 270                                 printk("\n" KERN_DEBUG);
 271                                 i=0;
 272                         }
 273                         this = this->next_in_ino;
 274                 }
 275                 printk("\n");
 276         });
 277
 278         if (ic->nodes == (void *)ic) {
 279                 D1(printk(KERN_DEBUG "inocache for ino #%u is all gone now. Freeing\n", ic->ino));
 280                 jffs2_del_ino_cache(c, ic);
 281                 jffs2_free_inode_cache(ic);
 282         }
 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
 303 static void jffs2_mark_erased_block(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb)
 304 {
 305         struct jffs2_raw_node_ref *marker_ref = NULL;
 306         unsigned char *ebuf;
 307         size_t retlen;
 308         int ret;
 309         uint32_t bad_offset;
 310
 311         if (!jffs2_cleanmarker_oob(c)) {
 312                 marker_ref = jffs2_alloc_raw_node_ref();
 313                 if (!marker_ref) {
 314                         printk(KERN_WARNING "Failed to allocate raw node ref for clean marker\n");
 315                         /* Stick it back on the list from whence it came and come back later */
 316                         jffs2_erase_pending_trigger(c);
 317                         spin_lock(&c->erase_completion_lock);
 318                         list_add(&jeb->list, &c->erase_complete_list);
 319                         spin_unlock(&c->erase_completion_lock);
 320                         return;
 321                 }
 322         }
 323         ebuf = kmalloc(PAGE_SIZE, GFP_KERNEL);
 324         if (!ebuf) {
 325                 printk(KERN_WARNING "Failed to allocate page buffer for verifying erase at 0x%08x. Assuming it worked\n", jeb->offset);
 326         } else {
 327                 uint32_t ofs = jeb->offset;
 328
 329                 D1(printk(KERN_DEBUG "Verifying erase at 0x%08x\n", jeb->offset));
 330                 while(ofs < jeb->offset + c->sector_size) {
 331                         uint32_t readlen = min((uint32_t)PAGE_SIZE, jeb->offset + c->sector_size - ofs);
 332                         int i;
 333
 334                         bad_offset = ofs;
 335
 336                         ret = jffs2_flash_read(c, ofs, readlen, &retlen, ebuf);
 337                         if (ret) {
 338                                 printk(KERN_WARNING "Read of newly-erased block at 0x%08x failed: %d. Putting on bad_list\n", ofs, ret);
 339                                 goto bad;
 340                         }
 341                         if (retlen != readlen) {
 342                                 printk(KERN_WARNING "Short read from newly-erased block at 0x%08x. Wanted %d, got %zd\n", ofs, readlen, retlen);
 343                                 goto bad;
 344                         }
 345                         for (i=0; i<readlen; i += sizeof(unsigned long)) {
 346                                 /* It's OK. We know it's properly aligned */
 347                                 unsigned long datum = *(unsigned long *)(&ebuf[i]);
 348                                 if (datum + 1) {
 349                                         bad_offset += i;
 350                                         printk(KERN_WARNING "Newly-erased block contained word 0x%lx at offset 0x%08x\n", datum, bad_offset);
 351                                 bad:
 352                                         if (!jffs2_cleanmarker_oob(c))
 353                                                 jffs2_free_raw_node_ref(marker_ref);
 354                                         kfree(ebuf);
 355                                 bad2:
 356                                         spin_lock(&c->erase_completion_lock);
 357                                         /* Stick it on a list (any list) so
 358                                            erase_failed can take it right off
 359                                            again.  Silly, but shouldn't happen
 360                                            often. */
 361                                         list_add(&jeb->list, &c->erasing_list);
 362                                         spin_unlock(&c->erase_completion_lock);
 363                                         jffs2_erase_failed(c, jeb, bad_offset);
 364                                         return;
 365                                 }
 366                         }
 367                         ofs += readlen;
 368                         cond_resched();
 369                 }
 370                 kfree(ebuf);
 371         }
 372
 373         bad_offset = jeb->offset;
 374
 375         /* Write the erase complete marker */
 376         D1(printk(KERN_DEBUG "Writing erased marker to block at 0x%08x\n", jeb->offset));
 377         if (jffs2_cleanmarker_oob(c)) {
 378
 379                 if (jffs2_write_nand_cleanmarker(c, jeb))
 380                         goto bad2;
 381
 382                 jeb->first_node = jeb->last_node = NULL;
 383
 384                 jeb->free_size = c->sector_size;
 385                 jeb->used_size = 0;
 386                 jeb->dirty_size = 0;
 387                 jeb->wasted_size = 0;
 388         } else {
 389                 struct jffs2_unknown_node marker = {
 390                         .magic =        cpu_to_je16(JFFS2_MAGIC_BITMASK),
 391                         .nodetype =     cpu_to_je16(JFFS2_NODETYPE_CLEANMARKER),
 392                         .totlen =       cpu_to_je32(c->cleanmarker_size)
 393                 };
 394
 395                 marker.hdr_crc = cpu_to_je32(crc32(0, &marker, sizeof(struct jffs2_unknown_node)-4));
 396
 397                 /* We only write the header; the rest was noise or padding anyway */
 398                 ret = jffs2_flash_write(c, jeb->offset, sizeof(marker), &retlen, (char *)&marker);
 399                 if (ret) {
 400                         printk(KERN_WARNING "Write clean marker to block at 0x%08x failed: %d\n",
 401                                jeb->offset, ret);
 402                         goto bad2;
 403                 }
 404                 if (retlen != sizeof(marker)) {
 405                         printk(KERN_WARNING "Short write to newly-erased block at 0x%08x: Wanted %zd, got %zd\n",
 406                                jeb->offset, sizeof(marker), retlen);
 407                         goto bad2;
 408                 }
 409
 410                 marker_ref->next_in_ino = NULL;
 411                 marker_ref->next_phys = NULL;
 412                 marker_ref->flash_offset = jeb->offset | REF_NORMAL;
 413                 marker_ref->__totlen = c->cleanmarker_size;
 414
 415                 jeb->first_node = jeb->last_node = marker_ref;
 416
 417                 jeb->free_size = c->sector_size - c->cleanmarker_size;
 418                 jeb->used_size = c->cleanmarker_size;
 419                 jeb->dirty_size = 0;
 420                 jeb->wasted_size = 0;
 421         }
 422
 423         spin_lock(&c->erase_completion_lock);
 424         c->erasing_size -= c->sector_size;
 425         c->free_size += jeb->free_size;
 426         c->used_size += jeb->used_size;
 427
 428         ACCT_SANITY_CHECK(c,jeb);
 429         D1(ACCT_PARANOIA_CHECK(jeb));
 430
 431         list_add_tail(&jeb->list, &c->free_list);
 432         c->nr_erasing_blocks--;
 433         c->nr_free_blocks++;
 434         spin_unlock(&c->erase_completion_lock);
 435         wake_up(&c->erase_wait);
 436 }
 437