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   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                 mutex_lock(&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                 mutex_unlock(&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 = MTD_FAIL_ADDR_UNKNOWN;
  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                 mutex_lock(&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                 mutex_unlock(&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 int jffs2_erase_pending_blocks(struct jffs2_sb_info *c, int count)
 107 {
 108         struct jffs2_eraseblock *jeb;
 109         int work_done = 0;
 110
 111         mutex_lock(&c->erase_free_sem);
 112
 113         spin_lock(&c->erase_completion_lock);
 114
 115         while (!list_empty(&c->erase_complete_list) ||
 116                !list_empty(&c->erase_pending_list)) {
 117
 118                 if (!list_empty(&c->erase_complete_list)) {
 119                         jeb = list_entry(c->erase_complete_list.next, struct jffs2_eraseblock, list);
 120                         list_move(&jeb->list, &c->erase_checking_list);
 121                         spin_unlock(&c->erase_completion_lock);
 122                         mutex_unlock(&c->erase_free_sem);
 123                         jffs2_mark_erased_block(c, jeb);
 124
 125                         work_done++;
 126                         if (!--count) {
 127                                 D1(printk(KERN_DEBUG "Count reached. jffs2_erase_pending_blocks leaving\n"));
 128                                 goto done;
 129                         }
 130
 131                 } else if (!list_empty(&c->erase_pending_list)) {
 132                         jeb = list_entry(c->erase_pending_list.next, struct jffs2_eraseblock, list);
 133                         D1(printk(KERN_DEBUG "Starting erase of pending block 0x%08x\n", jeb->offset));
 134                         list_del(&jeb->list);
 135                         c->erasing_size += c->sector_size;
 136                         c->wasted_size -= jeb->wasted_size;
 137                         c->free_size -= jeb->free_size;
 138                         c->used_size -= jeb->used_size;
 139                         c->dirty_size -= jeb->dirty_size;
 140                         jeb->wasted_size = jeb->used_size = jeb->dirty_size = jeb->free_size = 0;
 141                         jffs2_free_jeb_node_refs(c, jeb);
 142                         list_add(&jeb->list, &c->erasing_list);
 143                         spin_unlock(&c->erase_completion_lock);
 144                         mutex_unlock(&c->erase_free_sem);
 145
 146                         jffs2_erase_block(c, jeb);
 147
 148                 } else {
 149                         BUG();
 150                 }
 151
 152                 /* Be nice */
 153                 yield();
 154                 mutex_lock(&c->erase_free_sem);
 155                 spin_lock(&c->erase_completion_lock);
 156         }
 157
 158         spin_unlock(&c->erase_completion_lock);
 159         mutex_unlock(&c->erase_free_sem);
 160  done:
 161         D1(printk(KERN_DEBUG "jffs2_erase_pending_blocks completed\n"));
 162         return work_done;
 163 }
 164
 165 static void jffs2_erase_succeeded(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb)
 166 {
 167         D1(printk(KERN_DEBUG "Erase completed successfully at 0x%08x\n", jeb->offset));
 168         mutex_lock(&c->erase_free_sem);
 169         spin_lock(&c->erase_completion_lock);
 170         list_move_tail(&jeb->list, &c->erase_complete_list);
 171         spin_unlock(&c->erase_completion_lock);
 172         mutex_unlock(&c->erase_free_sem);
 173         /* Ensure that kupdated calls us again to mark them clean */
 174         jffs2_erase_pending_trigger(c);
 175 }
 176
 177 static void jffs2_erase_failed(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, uint32_t bad_offset)
 178 {
 179         /* For NAND, if the failure did not occur at the device level for a
 180            specific physical page, don't bother updating the bad block table. */
 181         if (jffs2_cleanmarker_oob(c) && (bad_offset != (uint32_t)MTD_FAIL_ADDR_UNKNOWN)) {
 182                 /* We had a device-level failure to erase.  Let's see if we've
 183                    failed too many times. */
 184                 if (!jffs2_write_nand_badblock(c, jeb, bad_offset)) {
 185                         /* We'd like to give this block another try. */
 186                         mutex_lock(&c->erase_free_sem);
 187                         spin_lock(&c->erase_completion_lock);
 188                         list_move(&jeb->list, &c->erase_pending_list);
 189                         c->erasing_size -= c->sector_size;
 190                         c->dirty_size += c->sector_size;
 191                         jeb->dirty_size = c->sector_size;
 192                         spin_unlock(&c->erase_completion_lock);
 193                         mutex_unlock(&c->erase_free_sem);
 194                         return;
 195                 }
 196         }
 197
 198         mutex_lock(&c->erase_free_sem);
 199         spin_lock(&c->erase_completion_lock);
 200         c->erasing_size -= c->sector_size;
 201         c->bad_size += c->sector_size;
 202         list_move(&jeb->list, &c->bad_list);
 203         c->nr_erasing_blocks--;
 204         spin_unlock(&c->erase_completion_lock);
 205         mutex_unlock(&c->erase_free_sem);
 206         wake_up(&c->erase_wait);
 207 }
 208
 209 #ifndef __ECOS
 210 static void jffs2_erase_callback(struct erase_info *instr)
 211 {
 212         struct erase_priv_struct *priv = (void *)instr->priv;
 213
 214         if(instr->state != MTD_ERASE_DONE) {
 215                 printk(KERN_WARNING "Erase at 0x%08llx finished, but state != MTD_ERASE_DONE. State is 0x%x instead.\n",
 216                         (unsigned long long)instr->addr, instr->state);
 217                 jffs2_erase_failed(priv->c, priv->jeb, instr->fail_addr);
 218         } else {
 219                 jffs2_erase_succeeded(priv->c, priv->jeb);
 220         }
 221         kfree(instr);
 222 }
 223 #endif /* !__ECOS */
 224
 225 /* Hmmm. Maybe we should accept the extra space it takes and make
 226    this a standard doubly-linked list? */
 227 static inline void jffs2_remove_node_refs_from_ino_list(struct jffs2_sb_info *c,
 228                         struct jffs2_raw_node_ref *ref, struct jffs2_eraseblock *jeb)
 229 {
 230         struct jffs2_inode_cache *ic = NULL;
 231         struct jffs2_raw_node_ref **prev;
 232
 233         prev = &ref->next_in_ino;
 234
 235         /* Walk the inode's list once, removing any nodes from this eraseblock */
 236         while (1) {
 237                 if (!(*prev)->next_in_ino) {
 238                         /* We're looking at the jffs2_inode_cache, which is
 239                            at the end of the linked list. Stash it and continue
 240                            from the beginning of the list */
 241                         ic = (struct jffs2_inode_cache *)(*prev);
 242                         prev = &ic->nodes;
 243                         continue;
 244                 }
 245
 246                 if (SECTOR_ADDR((*prev)->flash_offset) == jeb->offset) {
 247                         /* It's in the block we're erasing */
 248                         struct jffs2_raw_node_ref *this;
 249
 250                         this = *prev;
 251                         *prev = this->next_in_ino;
 252                         this->next_in_ino = NULL;
 253
 254                         if (this == ref)
 255                                 break;
 256
 257                         continue;
 258                 }
 259                 /* Not to be deleted. Skip */
 260                 prev = &((*prev)->next_in_ino);
 261         }
 262
 263         /* PARANOIA */
 264         if (!ic) {
 265                 JFFS2_WARNING("inode_cache/xattr_datum/xattr_ref"
 266                               " not found in remove_node_refs()!!\n");
 267                 return;
 268         }
 269
 270         D1(printk(KERN_DEBUG "Removed nodes in range 0x%08x-0x%08x from ino #%u\n",
 271                   jeb->offset, jeb->offset + c->sector_size, ic->ino));
 272
 273         D2({
 274                 int i=0;
 275                 struct jffs2_raw_node_ref *this;
 276                 printk(KERN_DEBUG "After remove_node_refs_from_ino_list: \n");
 277
 278                 this = ic->nodes;
 279
 280                 printk(KERN_DEBUG);
 281                 while(this) {
 282                         printk(KERN_CONT "0x%08x(%d)->",
 283                                ref_offset(this), ref_flags(this));
 284                         if (++i == 5) {
 285                                 printk(KERN_DEBUG);
 286                                 i=0;
 287                         }
 288                         this = this->next_in_ino;
 289                 }
 290                 printk(KERN_CONT "\n");
 291         });
 292
 293         switch (ic->class) {
 294 #ifdef CONFIG_JFFS2_FS_XATTR
 295                 case RAWNODE_CLASS_XATTR_DATUM:
 296                         jffs2_release_xattr_datum(c, (struct jffs2_xattr_datum *)ic);
 297                         break;
 298                 case RAWNODE_CLASS_XATTR_REF:
 299                         jffs2_release_xattr_ref(c, (struct jffs2_xattr_ref *)ic);
 300                         break;
 301 #endif
 302                 default:
 303                         if (ic->nodes == (void *)ic && ic->pino_nlink == 0)
 304                                 jffs2_del_ino_cache(c, ic);
 305         }
 306 }
 307
 308 void jffs2_free_jeb_node_refs(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb)
 309 {
 310         struct jffs2_raw_node_ref *block, *ref;
 311         D1(printk(KERN_DEBUG "Freeing all node refs for eraseblock offset 0x%08x\n", jeb->offset));
 312
 313         block = ref = jeb->first_node;
 314
 315         while (ref) {
 316                 if (ref->flash_offset == REF_LINK_NODE) {
 317                         ref = ref->next_in_ino;
 318                         jffs2_free_refblock(block);
 319                         block = ref;
 320                         continue;
 321                 }
 322                 if (ref->flash_offset != REF_EMPTY_NODE && ref->next_in_ino)
 323                         jffs2_remove_node_refs_from_ino_list(c, ref, jeb);
 324                 /* else it was a non-inode node or already removed, so don't bother */
 325
 326                 ref++;
 327         }
 328         jeb->first_node = jeb->last_node = NULL;
 329 }
 330
 331 static int jffs2_block_check_erase(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, uint32_t *bad_offset)
 332 {
 333         void *ebuf;
 334         uint32_t ofs;
 335         size_t retlen;
 336         int ret = -EIO;
 337
 338         if (c->mtd->point) {
 339                 unsigned long *wordebuf;
 340
 341                 ret = c->mtd->point(c->mtd, jeb->offset, c->sector_size,
 342                                     &retlen, &ebuf, NULL);
 343                 if (ret) {
 344                         D1(printk(KERN_DEBUG "MTD point failed %d\n", ret));
 345                         goto do_flash_read;
 346                 }
 347                 if (retlen < c->sector_size) {
 348                         /* Don't muck about if it won't let us point to the whole erase sector */
 349                         D1(printk(KERN_DEBUG "MTD point returned len too short: 0x%zx\n", retlen));
 350                         c->mtd->unpoint(c->mtd, jeb->offset, retlen);
 351                         goto do_flash_read;
 352                 }
 353                 wordebuf = ebuf-sizeof(*wordebuf);
 354                 retlen /= sizeof(*wordebuf);
 355                 do {
 356                    if (*++wordebuf != ~0)
 357                            break;
 358                 } while(--retlen);
 359                 c->mtd->unpoint(c->mtd, jeb->offset, c->sector_size);
 360                 if (retlen) {
 361                         printk(KERN_WARNING "Newly-erased block contained word 0x%lx at offset 0x%08tx\n",
 362                                *wordebuf, jeb->offset + c->sector_size-retlen*sizeof(*wordebuf));
 363                         return -EIO;
 364                 }
 365                 return 0;
 366         }
 367  do_flash_read:
 368         ebuf = kmalloc(PAGE_SIZE, GFP_KERNEL);
 369         if (!ebuf) {
 370                 printk(KERN_WARNING "Failed to allocate page buffer for verifying erase at 0x%08x. Refiling\n", jeb->offset);
 371                 return -EAGAIN;
 372         }
 373
 374         D1(printk(KERN_DEBUG "Verifying erase at 0x%08x\n", jeb->offset));
 375
 376         for (ofs = jeb->offset; ofs < jeb->offset + c->sector_size; ) {
 377                 uint32_t readlen = min((uint32_t)PAGE_SIZE, jeb->offset + c->sector_size - ofs);
 378                 int i;
 379
 380                 *bad_offset = ofs;
 381
 382                 ret = c->mtd->read(c->mtd, ofs, readlen, &retlen, ebuf);
 383                 if (ret) {
 384                         printk(KERN_WARNING "Read of newly-erased block at 0x%08x failed: %d. Putting on bad_list\n", ofs, ret);
 385                         ret = -EIO;
 386                         goto fail;
 387                 }
 388                 if (retlen != readlen) {
 389                         printk(KERN_WARNING "Short read from newly-erased block at 0x%08x. Wanted %d, got %zd\n", ofs, readlen, retlen);
 390                         ret = -EIO;
 391                         goto fail;
 392                 }
 393                 for (i=0; i<readlen; i += sizeof(unsigned long)) {
 394                         /* It's OK. We know it's properly aligned */
 395                         unsigned long *datum = ebuf + i;
 396                         if (*datum + 1) {
 397                                 *bad_offset += i;
 398                                 printk(KERN_WARNING "Newly-erased block contained word 0x%lx at offset 0x%08x\n", *datum, *bad_offset);
 399                                 ret = -EIO;
 400                                 goto fail;
 401                         }
 402                 }
 403                 ofs += readlen;
 404                 cond_resched();
 405         }
 406         ret = 0;
 407 fail:
 408         kfree(ebuf);
 409         return ret;
 410 }
 411
 412 static void jffs2_mark_erased_block(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb)
 413 {
 414         size_t retlen;
 415         int ret;
 416         uint32_t uninitialized_var(bad_offset);
 417
 418         switch (jffs2_block_check_erase(c, jeb, &bad_offset)) {
 419         case -EAGAIN:   goto refile;
 420         case -EIO:      goto filebad;
 421         }
 422
 423         /* Write the erase complete marker */
 424         D1(printk(KERN_DEBUG "Writing erased marker to block at 0x%08x\n", jeb->offset));
 425         bad_offset = jeb->offset;
 426
 427         /* Cleanmarker in oob area or no cleanmarker at all ? */
 428         if (jffs2_cleanmarker_oob(c) || c->cleanmarker_size == 0) {
 429
 430                 if (jffs2_cleanmarker_oob(c)) {
 431                         if (jffs2_write_nand_cleanmarker(c, jeb))
 432                                 goto filebad;
 433                 }
 434         } else {
 435
 436                 struct kvec vecs[1];
 437                 struct jffs2_unknown_node marker = {
 438                         .magic =        cpu_to_je16(JFFS2_MAGIC_BITMASK),
 439                         .nodetype =     cpu_to_je16(JFFS2_NODETYPE_CLEANMARKER),
 440                         .totlen =       cpu_to_je32(c->cleanmarker_size)
 441                 };
 442
 443                 jffs2_prealloc_raw_node_refs(c, jeb, 1);
 444
 445                 marker.hdr_crc = cpu_to_je32(crc32(0, &marker, sizeof(struct jffs2_unknown_node)-4));
 446
 447                 vecs[0].iov_base = (unsigned char *) &marker;
 448                 vecs[0].iov_len = sizeof(marker);
 449                 ret = jffs2_flash_direct_writev(c, vecs, 1, jeb->offset, &retlen);
 450
 451                 if (ret || retlen != sizeof(marker)) {
 452                         if (ret)
 453                                 printk(KERN_WARNING "Write clean marker to block at 0x%08x failed: %d\n",
 454                                        jeb->offset, ret);
 455                         else
 456                                 printk(KERN_WARNING "Short write to newly-erased block at 0x%08x: Wanted %zd, got %zd\n",
 457                                        jeb->offset, sizeof(marker), retlen);
 458
 459                         goto filebad;
 460                 }
 461         }
 462         /* Everything else got zeroed before the erase */
 463         jeb->free_size = c->sector_size;
 464
 465         mutex_lock(&c->erase_free_sem);
 466         spin_lock(&c->erase_completion_lock);
 467
 468         c->erasing_size -= c->sector_size;
 469         c->free_size += c->sector_size;
 470
 471         /* Account for cleanmarker now, if it's in-band */
 472         if (c->cleanmarker_size && !jffs2_cleanmarker_oob(c))
 473                 jffs2_link_node_ref(c, jeb, jeb->offset | REF_NORMAL, c->cleanmarker_size, NULL);
 474
 475         list_move_tail(&jeb->list, &c->free_list);
 476         c->nr_erasing_blocks--;
 477         c->nr_free_blocks++;
 478
 479         jffs2_dbg_acct_sanity_check_nolock(c, jeb);
 480         jffs2_dbg_acct_paranoia_check_nolock(c, jeb);
 481
 482         spin_unlock(&c->erase_completion_lock);
 483         mutex_unlock(&c->erase_free_sem);
 484         wake_up(&c->erase_wait);
 485         return;
 486
 487 filebad:
 488         jffs2_erase_failed(c, jeb, bad_offset);
 489         return;
 490
 491 refile:
 492         /* Stick it back on the list from whence it came and come back later */
 493         jffs2_erase_pending_trigger(c);
 494         mutex_lock(&c->erase_free_sem);
 495         spin_lock(&c->erase_completion_lock);
 496         list_move(&jeb->list, &c->erase_complete_list);
 497         spin_unlock(&c->erase_completion_lock);
 498         mutex_unlock(&c->erase_free_sem);
 499         return;
 500 }