git.oblomov.eu Git - linux-2.6/blob - fs/jffs2/erase.c

   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" KERN_DEBUG);
 274
 275                 this = ic->nodes;
 276
 277                 while(this) {
 278                         printk( "0x%08x(%d)->", ref_offset(this), ref_flags(this));
 279                         if (++i == 5) {
 280                                 printk("\n" KERN_DEBUG);
 281                                 i=0;
 282                         }
 283                         this = this->next_in_ino;
 284                 }
 285                 printk("\n");
 286         });
 287
 288         switch (ic->class) {
 289 #ifdef CONFIG_JFFS2_FS_XATTR
 290                 case RAWNODE_CLASS_XATTR_DATUM:
 291                         jffs2_release_xattr_datum(c, (struct jffs2_xattr_datum *)ic);
 292                         break;
 293                 case RAWNODE_CLASS_XATTR_REF:
 294                         jffs2_release_xattr_ref(c, (struct jffs2_xattr_ref *)ic);
 295                         break;
 296 #endif
 297                 default:
 298                         if (ic->nodes == (void *)ic && ic->pino_nlink == 0)
 299                                 jffs2_del_ino_cache(c, ic);
 300         }
 301 }
 302
 303 void jffs2_free_jeb_node_refs(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb)
 304 {
 305         struct jffs2_raw_node_ref *block, *ref;
 306         D1(printk(KERN_DEBUG "Freeing all node refs for eraseblock offset 0x%08x\n", jeb->offset));
 307
 308         block = ref = jeb->first_node;
 309
 310         while (ref) {
 311                 if (ref->flash_offset == REF_LINK_NODE) {
 312                         ref = ref->next_in_ino;
 313                         jffs2_free_refblock(block);
 314                         block = ref;
 315                         continue;
 316                 }
 317                 if (ref->flash_offset != REF_EMPTY_NODE && ref->next_in_ino)
 318                         jffs2_remove_node_refs_from_ino_list(c, ref, jeb);
 319                 /* else it was a non-inode node or already removed, so don't bother */
 320
 321                 ref++;
 322         }
 323         jeb->first_node = jeb->last_node = NULL;
 324 }
 325
 326 static int jffs2_block_check_erase(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, uint32_t *bad_offset)
 327 {
 328         void *ebuf;
 329         uint32_t ofs;
 330         size_t retlen;
 331         int ret = -EIO;
 332
 333         if (c->mtd->point) {
 334                 unsigned long *wordebuf;
 335
 336                 ret = c->mtd->point(c->mtd, jeb->offset, c->sector_size,
 337                                     &retlen, &ebuf, NULL);
 338                 if (ret) {
 339                         D1(printk(KERN_DEBUG "MTD point failed %d\n", ret));
 340                         goto do_flash_read;
 341                 }
 342                 if (retlen < c->sector_size) {
 343                         /* Don't muck about if it won't let us point to the whole erase sector */
 344                         D1(printk(KERN_DEBUG "MTD point returned len too short: 0x%zx\n", retlen));
 345                         c->mtd->unpoint(c->mtd, jeb->offset, retlen);
 346                         goto do_flash_read;
 347                 }
 348                 wordebuf = ebuf-sizeof(*wordebuf);
 349                 retlen /= sizeof(*wordebuf);
 350                 do {
 351                    if (*++wordebuf != ~0)
 352                            break;
 353                 } while(--retlen);
 354                 c->mtd->unpoint(c->mtd, jeb->offset, c->sector_size);
 355                 if (retlen) {
 356                         printk(KERN_WARNING "Newly-erased block contained word 0x%lx at offset 0x%08tx\n",
 357                                *wordebuf, jeb->offset + c->sector_size-retlen*sizeof(*wordebuf));
 358                         return -EIO;
 359                 }
 360                 return 0;
 361         }
 362  do_flash_read:
 363         ebuf = kmalloc(PAGE_SIZE, GFP_KERNEL);
 364         if (!ebuf) {
 365                 printk(KERN_WARNING "Failed to allocate page buffer for verifying erase at 0x%08x. Refiling\n", jeb->offset);
 366                 return -EAGAIN;
 367         }
 368
 369         D1(printk(KERN_DEBUG "Verifying erase at 0x%08x\n", jeb->offset));
 370
 371         for (ofs = jeb->offset; ofs < jeb->offset + c->sector_size; ) {
 372                 uint32_t readlen = min((uint32_t)PAGE_SIZE, jeb->offset + c->sector_size - ofs);
 373                 int i;
 374
 375                 *bad_offset = ofs;
 376
 377                 ret = c->mtd->read(c->mtd, ofs, readlen, &retlen, ebuf);
 378                 if (ret) {
 379                         printk(KERN_WARNING "Read of newly-erased block at 0x%08x failed: %d. Putting on bad_list\n", ofs, ret);
 380                         ret = -EIO;
 381                         goto fail;
 382                 }
 383                 if (retlen != readlen) {
 384                         printk(KERN_WARNING "Short read from newly-erased block at 0x%08x. Wanted %d, got %zd\n", ofs, readlen, retlen);
 385                         ret = -EIO;
 386                         goto fail;
 387                 }
 388                 for (i=0; i<readlen; i += sizeof(unsigned long)) {
 389                         /* It's OK. We know it's properly aligned */
 390                         unsigned long *datum = ebuf + i;
 391                         if (*datum + 1) {
 392                                 *bad_offset += i;
 393                                 printk(KERN_WARNING "Newly-erased block contained word 0x%lx at offset 0x%08x\n", *datum, *bad_offset);
 394                                 ret = -EIO;
 395                                 goto fail;
 396                         }
 397                 }
 398                 ofs += readlen;
 399                 cond_resched();
 400         }
 401         ret = 0;
 402 fail:
 403         kfree(ebuf);
 404         return ret;
 405 }
 406
 407 static void jffs2_mark_erased_block(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb)
 408 {
 409         size_t retlen;
 410         int ret;
 411         uint32_t uninitialized_var(bad_offset);
 412
 413         switch (jffs2_block_check_erase(c, jeb, &bad_offset)) {
 414         case -EAGAIN:   goto refile;
 415         case -EIO:      goto filebad;
 416         }
 417
 418         /* Write the erase complete marker */
 419         D1(printk(KERN_DEBUG "Writing erased marker to block at 0x%08x\n", jeb->offset));
 420         bad_offset = jeb->offset;
 421
 422         /* Cleanmarker in oob area or no cleanmarker at all ? */
 423         if (jffs2_cleanmarker_oob(c) || c->cleanmarker_size == 0) {
 424
 425                 if (jffs2_cleanmarker_oob(c)) {
 426                         if (jffs2_write_nand_cleanmarker(c, jeb))
 427                                 goto filebad;
 428                 }
 429         } else {
 430
 431                 struct kvec vecs[1];
 432                 struct jffs2_unknown_node marker = {
 433                         .magic =        cpu_to_je16(JFFS2_MAGIC_BITMASK),
 434                         .nodetype =     cpu_to_je16(JFFS2_NODETYPE_CLEANMARKER),
 435                         .totlen =       cpu_to_je32(c->cleanmarker_size)
 436                 };
 437
 438                 jffs2_prealloc_raw_node_refs(c, jeb, 1);
 439
 440                 marker.hdr_crc = cpu_to_je32(crc32(0, &marker, sizeof(struct jffs2_unknown_node)-4));
 441
 442                 vecs[0].iov_base = (unsigned char *) &marker;
 443                 vecs[0].iov_len = sizeof(marker);
 444                 ret = jffs2_flash_direct_writev(c, vecs, 1, jeb->offset, &retlen);
 445
 446                 if (ret || retlen != sizeof(marker)) {
 447                         if (ret)
 448                                 printk(KERN_WARNING "Write clean marker to block at 0x%08x failed: %d\n",
 449                                        jeb->offset, ret);
 450                         else
 451                                 printk(KERN_WARNING "Short write to newly-erased block at 0x%08x: Wanted %zd, got %zd\n",
 452                                        jeb->offset, sizeof(marker), retlen);
 453
 454                         goto filebad;
 455                 }
 456         }
 457         /* Everything else got zeroed before the erase */
 458         jeb->free_size = c->sector_size;
 459
 460         mutex_lock(&c->erase_free_sem);
 461         spin_lock(&c->erase_completion_lock);
 462
 463         c->erasing_size -= c->sector_size;
 464         c->free_size += c->sector_size;
 465
 466         /* Account for cleanmarker now, if it's in-band */
 467         if (c->cleanmarker_size && !jffs2_cleanmarker_oob(c))
 468                 jffs2_link_node_ref(c, jeb, jeb->offset | REF_NORMAL, c->cleanmarker_size, NULL);
 469
 470         list_move_tail(&jeb->list, &c->free_list);
 471         c->nr_erasing_blocks--;
 472         c->nr_free_blocks++;
 473
 474         jffs2_dbg_acct_sanity_check_nolock(c, jeb);
 475         jffs2_dbg_acct_paranoia_check_nolock(c, jeb);
 476
 477         spin_unlock(&c->erase_completion_lock);
 478         mutex_unlock(&c->erase_free_sem);
 479         wake_up(&c->erase_wait);
 480         return;
 481
 482 filebad:
 483         mutex_lock(&c->erase_free_sem);
 484         spin_lock(&c->erase_completion_lock);
 485         /* Stick it on a list (any list) so erase_failed can take it
 486            right off again.  Silly, but shouldn't happen often. */
 487         list_move(&jeb->list, &c->erasing_list);
 488         spin_unlock(&c->erase_completion_lock);
 489         mutex_unlock(&c->erase_free_sem);
 490         jffs2_erase_failed(c, jeb, bad_offset);
 491         return;
 492
 493 refile:
 494         /* Stick it back on the list from whence it came and come back later */
 495         jffs2_erase_pending_trigger(c);
 496         mutex_lock(&c->erase_free_sem);
 497         spin_lock(&c->erase_completion_lock);
 498         list_move(&jeb->list, &c->erase_complete_list);
 499         spin_unlock(&c->erase_completion_lock);
 500         mutex_unlock(&c->erase_free_sem);
 501         return;
 502 }