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