git.oblomov.eu Git - linux-2.6/blob - fs/jffs2/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@infradead.org>
   7  *
   8  * For licensing information, see the file 'LICENCE' in this directory.
   9  *
  10  * $Id: erase.c,v 1.80 2005/07/14 19:46:24 joern 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 static void jffs2_erase_block(struct jffs2_sb_info *c,
  37                               struct jffs2_eraseblock *jeb)
  38 {
  39         int ret;
  40         uint32_t bad_offset;
  41 #ifdef __ECOS
  42        ret = jffs2_flash_erase(c, jeb);
  43        if (!ret) {
  44                jffs2_erase_succeeded(c, jeb);
  45                return;
  46        }
  47        bad_offset = jeb->offset;
  48 #else /* Linux */
  49         struct erase_info *instr;
  50
  51         D1(printk(KERN_DEBUG "jffs2_erase_block(): erase block %#x (range %#x-%#x)\n", jeb->offset, jeb->offset, jeb->offset + c->sector_size));
  52         instr = kmalloc(sizeof(struct erase_info) + sizeof(struct erase_priv_struct), GFP_KERNEL);
  53         if (!instr) {
  54                 printk(KERN_WARNING "kmalloc for struct erase_info in jffs2_erase_block failed. Refiling block for later\n");
  55                 spin_lock(&c->erase_completion_lock);
  56                 list_del(&jeb->list);
  57                 list_add(&jeb->list, &c->erase_pending_list);
  58                 c->erasing_size -= c->sector_size;
  59                 c->dirty_size += c->sector_size;
  60                 jeb->dirty_size = c->sector_size;
  61                 spin_unlock(&c->erase_completion_lock);
  62                 return;
  63         }
  64
  65         memset(instr, 0, sizeof(*instr));
  66
  67         instr->mtd = c->mtd;
  68         instr->addr = jeb->offset;
  69         instr->len = c->sector_size;
  70         instr->callback = jffs2_erase_callback;
  71         instr->priv = (unsigned long)(&instr[1]);
  72         instr->fail_addr = 0xffffffff;
  73
  74         ((struct erase_priv_struct *)instr->priv)->jeb = jeb;
  75         ((struct erase_priv_struct *)instr->priv)->c = c;
  76
  77         ret = c->mtd->erase(c->mtd, instr);
  78         if (!ret)
  79                 return;
  80
  81         bad_offset = instr->fail_addr;
  82         kfree(instr);
  83 #endif /* __ECOS */
  84
  85         if (ret == -ENOMEM || ret == -EAGAIN) {
  86                 /* Erase failed immediately. Refile it on the list */
  87                 D1(printk(KERN_DEBUG "Erase at 0x%08x failed: %d. Refiling on erase_pending_list\n", jeb->offset, ret));
  88                 spin_lock(&c->erase_completion_lock);
  89                 list_del(&jeb->list);
  90                 list_add(&jeb->list, &c->erase_pending_list);
  91                 c->erasing_size -= c->sector_size;
  92                 c->dirty_size += c->sector_size;
  93                 jeb->dirty_size = c->sector_size;
  94                 spin_unlock(&c->erase_completion_lock);
  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         down(&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_del(&jeb->list);
 120                         spin_unlock(&c->erase_completion_lock);
 121                         jffs2_mark_erased_block(c, jeb);
 122
 123                         if (!--count) {
 124                                 D1(printk(KERN_DEBUG "Count reached. jffs2_erase_pending_blocks leaving\n"));
 125                                 goto done;
 126                         }
 127
 128                 } else if (!list_empty(&c->erase_pending_list)) {
 129                         jeb = list_entry(c->erase_pending_list.next, struct jffs2_eraseblock, list);
 130                         D1(printk(KERN_DEBUG "Starting erase of pending block 0x%08x\n", jeb->offset));
 131                         list_del(&jeb->list);
 132                         c->erasing_size += c->sector_size;
 133                         c->wasted_size -= jeb->wasted_size;
 134                         c->free_size -= jeb->free_size;
 135                         c->used_size -= jeb->used_size;
 136                         c->dirty_size -= jeb->dirty_size;
 137                         jeb->wasted_size = jeb->used_size = jeb->dirty_size = jeb->free_size = 0;
 138                         jffs2_free_all_node_refs(c, jeb);
 139                         list_add(&jeb->list, &c->erasing_list);
 140                         spin_unlock(&c->erase_completion_lock);
 141
 142                         jffs2_erase_block(c, jeb);
 143
 144                 } else {
 145                         BUG();
 146                 }
 147
 148                 /* Be nice */
 149                 cond_resched();
 150                 spin_lock(&c->erase_completion_lock);
 151         }
 152
 153         spin_unlock(&c->erase_completion_lock);
 154  done:
 155         D1(printk(KERN_DEBUG "jffs2_erase_pending_blocks completed\n"));
 156
 157         up(&c->erase_free_sem);
 158 }
 159
 160 static void jffs2_erase_succeeded(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb)
 161 {
 162         D1(printk(KERN_DEBUG "Erase completed successfully at 0x%08x\n", jeb->offset));
 163         spin_lock(&c->erase_completion_lock);
 164         list_del(&jeb->list);
 165         list_add_tail(&jeb->list, &c->erase_complete_list);
 166         spin_unlock(&c->erase_completion_lock);
 167         /* Ensure that kupdated calls us again to mark them clean */
 168         jffs2_erase_pending_trigger(c);
 169 }
 170
 171 static void jffs2_erase_failed(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, uint32_t bad_offset)
 172 {
 173         /* For NAND, if the failure did not occur at the device level for a
 174            specific physical page, don't bother updating the bad block table. */
 175         if (jffs2_cleanmarker_oob(c) && (bad_offset != 0xffffffff)) {
 176                 /* We had a device-level failure to erase.  Let's see if we've
 177                    failed too many times. */
 178                 if (!jffs2_write_nand_badblock(c, jeb, bad_offset)) {
 179                         /* We'd like to give this block another try. */
 180                         spin_lock(&c->erase_completion_lock);
 181                         list_del(&jeb->list);
 182                         list_add(&jeb->list, &c->erase_pending_list);
 183                         c->erasing_size -= c->sector_size;
 184                         c->dirty_size += c->sector_size;
 185                         jeb->dirty_size = c->sector_size;
 186                         spin_unlock(&c->erase_completion_lock);
 187                         return;
 188                 }
 189         }
 190
 191         spin_lock(&c->erase_completion_lock);
 192         c->erasing_size -= c->sector_size;
 193         c->bad_size += c->sector_size;
 194         list_del(&jeb->list);
 195         list_add(&jeb->list, &c->bad_list);
 196         c->nr_erasing_blocks--;
 197         spin_unlock(&c->erase_completion_lock);
 198         wake_up(&c->erase_wait);
 199 }
 200
 201 #ifndef __ECOS
 202 static void jffs2_erase_callback(struct erase_info *instr)
 203 {
 204         struct erase_priv_struct *priv = (void *)instr->priv;
 205
 206         if(instr->state != MTD_ERASE_DONE) {
 207                 printk(KERN_WARNING "Erase at 0x%08x finished, but state != MTD_ERASE_DONE. State is 0x%x instead.\n", instr->addr, instr->state);
 208                 jffs2_erase_failed(priv->c, priv->jeb, instr->fail_addr);
 209         } else {
 210                 jffs2_erase_succeeded(priv->c, priv->jeb);
 211         }
 212         kfree(instr);
 213 }
 214 #endif /* !__ECOS */
 215
 216 /* Hmmm. Maybe we should accept the extra space it takes and make
 217    this a standard doubly-linked list? */
 218 static inline void jffs2_remove_node_refs_from_ino_list(struct jffs2_sb_info *c,
 219                         struct jffs2_raw_node_ref *ref, struct jffs2_eraseblock *jeb)
 220 {
 221         struct jffs2_inode_cache *ic = NULL;
 222         struct jffs2_raw_node_ref **prev;
 223
 224         prev = &ref->next_in_ino;
 225
 226         /* Walk the inode's list once, removing any nodes from this eraseblock */
 227         while (1) {
 228                 if (!(*prev)->next_in_ino) {
 229                         /* We're looking at the jffs2_inode_cache, which is
 230                            at the end of the linked list. Stash it and continue
 231                            from the beginning of the list */
 232                         ic = (struct jffs2_inode_cache *)(*prev);
 233                         prev = &ic->nodes;
 234                         continue;
 235                 }
 236
 237                 if (SECTOR_ADDR((*prev)->flash_offset) == jeb->offset) {
 238                         /* It's in the block we're erasing */
 239                         struct jffs2_raw_node_ref *this;
 240
 241                         this = *prev;
 242                         *prev = this->next_in_ino;
 243                         this->next_in_ino = NULL;
 244
 245                         if (this == ref)
 246                                 break;
 247
 248                         continue;
 249                 }
 250                 /* Not to be deleted. Skip */
 251                 prev = &((*prev)->next_in_ino);
 252         }
 253
 254         /* PARANOIA */
 255         if (!ic) {
 256                 printk(KERN_WARNING "inode_cache not found in remove_node_refs()!!\n");
 257                 return;
 258         }
 259
 260         D1(printk(KERN_DEBUG "Removed nodes in range 0x%08x-0x%08x from ino #%u\n",
 261                   jeb->offset, jeb->offset + c->sector_size, ic->ino));
 262
 263         D2({
 264                 int i=0;
 265                 struct jffs2_raw_node_ref *this;
 266                 printk(KERN_DEBUG "After remove_node_refs_from_ino_list: \n" KERN_DEBUG);
 267
 268                 this = ic->nodes;
 269
 270                 while(this) {
 271                         printk( "0x%08x(%d)->", ref_offset(this), ref_flags(this));
 272                         if (++i == 5) {
 273                                 printk("\n" KERN_DEBUG);
 274                                 i=0;
 275                         }
 276                         this = this->next_in_ino;
 277                 }
 278                 printk("\n");
 279         });
 280
 281         if (ic->nodes == (void *)ic && ic->nlink == 0)
 282                 jffs2_del_ino_cache(c, ic);
 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 int jffs2_block_check_erase(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, uint32_t *bad_offset)
 304 {
 305         void *ebuf;
 306         uint32_t ofs;
 307         size_t retlen;
 308         int ret = -EIO;
 309
 310         ebuf = kmalloc(PAGE_SIZE, GFP_KERNEL);
 311         if (!ebuf) {
 312                 printk(KERN_WARNING "Failed to allocate page buffer for verifying erase at 0x%08x. Refiling\n", jeb->offset);
 313                 return -EAGAIN;
 314         }
 315
 316         D1(printk(KERN_DEBUG "Verifying erase at 0x%08x\n", jeb->offset));
 317
 318         for (ofs = jeb->offset; ofs < jeb->offset + c->sector_size; ) {
 319                 uint32_t readlen = min((uint32_t)PAGE_SIZE, jeb->offset + c->sector_size - ofs);
 320                 int i;
 321
 322                 *bad_offset = ofs;
 323
 324                 ret = jffs2_flash_read(c, ofs, readlen, &retlen, ebuf);
 325                 if (ret) {
 326                         printk(KERN_WARNING "Read of newly-erased block at 0x%08x failed: %d. Putting on bad_list\n", ofs, ret);
 327                         goto fail;
 328                 }
 329                 if (retlen != readlen) {
 330                         printk(KERN_WARNING "Short read from newly-erased block at 0x%08x. Wanted %d, got %zd\n", ofs, readlen, retlen);
 331                         goto fail;
 332                 }
 333                 for (i=0; i<readlen; i += sizeof(unsigned long)) {
 334                         /* It's OK. We know it's properly aligned */
 335                         unsigned long *datum = ebuf + i;
 336                         if (*datum + 1) {
 337                                 *bad_offset += i;
 338                                 printk(KERN_WARNING "Newly-erased block contained word 0x%lx at offset 0x%08x\n", *datum, *bad_offset);
 339                                 goto fail;
 340                         }
 341                 }
 342                 ofs += readlen;
 343                 cond_resched();
 344         }
 345         ret = 0;
 346 fail:
 347         kfree(ebuf);
 348         return ret;
 349 }
 350
 351 static void jffs2_mark_erased_block(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb)
 352 {
 353         struct jffs2_raw_node_ref *marker_ref = NULL;
 354         size_t retlen;
 355         int ret;
 356         uint32_t bad_offset;
 357
 358         switch (jffs2_block_check_erase(c, jeb, &bad_offset)) {
 359         case -EAGAIN:   goto refile;
 360         case -EIO:      goto filebad;
 361         }
 362
 363         /* Write the erase complete marker */
 364         D1(printk(KERN_DEBUG "Writing erased marker to block at 0x%08x\n", jeb->offset));
 365         bad_offset = jeb->offset;
 366
 367         /* Cleanmarker in oob area or no cleanmarker at all ? */
 368         if (jffs2_cleanmarker_oob(c) || c->cleanmarker_size == 0) {
 369
 370                 if (jffs2_cleanmarker_oob(c)) {
 371                         if (jffs2_write_nand_cleanmarker(c, jeb))
 372                                 goto filebad;
 373                 }
 374
 375                 jeb->first_node = jeb->last_node = NULL;
 376                 jeb->free_size = c->sector_size;
 377                 jeb->used_size = 0;
 378                 jeb->dirty_size = 0;
 379                 jeb->wasted_size = 0;
 380
 381         } else {
 382
 383                 struct kvec vecs[1];
 384                 struct jffs2_unknown_node marker = {
 385                         .magic =        cpu_to_je16(JFFS2_MAGIC_BITMASK),
 386                         .nodetype =     cpu_to_je16(JFFS2_NODETYPE_CLEANMARKER),
 387                         .totlen =       cpu_to_je32(c->cleanmarker_size)
 388                 };
 389
 390                 marker_ref = jffs2_alloc_raw_node_ref();
 391                 if (!marker_ref) {
 392                         printk(KERN_WARNING "Failed to allocate raw node ref for clean marker. Refiling\n");
 393                         goto refile;
 394                 }
 395
 396                 marker.hdr_crc = cpu_to_je32(crc32(0, &marker, sizeof(struct jffs2_unknown_node)-4));
 397
 398                 vecs[0].iov_base = (unsigned char *) &marker;
 399                 vecs[0].iov_len = sizeof(marker);
 400                 ret = jffs2_flash_direct_writev(c, vecs, 1, jeb->offset, &retlen);
 401
 402                 if (ret || retlen != sizeof(marker)) {
 403                         if (ret)
 404                                 printk(KERN_WARNING "Write clean marker to block at 0x%08x failed: %d\n",
 405                                        jeb->offset, ret);
 406                         else
 407                                 printk(KERN_WARNING "Short write to newly-erased block at 0x%08x: Wanted %zd, got %zd\n",
 408                                        jeb->offset, sizeof(marker), retlen);
 409
 410                         jffs2_free_raw_node_ref(marker_ref);
 411                         goto filebad;
 412                 }
 413
 414                 marker_ref->next_in_ino = NULL;
 415                 marker_ref->next_phys = NULL;
 416                 marker_ref->flash_offset = jeb->offset | REF_NORMAL;
 417                 marker_ref->__totlen = c->cleanmarker_size;
 418
 419                 jeb->first_node = jeb->last_node = marker_ref;
 420
 421                 jeb->free_size = c->sector_size - c->cleanmarker_size;
 422                 jeb->used_size = c->cleanmarker_size;
 423                 jeb->dirty_size = 0;
 424                 jeb->wasted_size = 0;
 425         }
 426
 427         spin_lock(&c->erase_completion_lock);
 428         c->erasing_size -= c->sector_size;
 429         c->free_size += jeb->free_size;
 430         c->used_size += jeb->used_size;
 431
 432         ACCT_SANITY_CHECK(c,jeb);
 433         D1(ACCT_PARANOIA_CHECK(jeb));
 434
 435         list_add_tail(&jeb->list, &c->free_list);
 436         c->nr_erasing_blocks--;
 437         c->nr_free_blocks++;
 438         spin_unlock(&c->erase_completion_lock);
 439         wake_up(&c->erase_wait);
 440         return;
 441
 442 filebad:
 443         spin_lock(&c->erase_completion_lock);
 444         /* Stick it on a list (any list) so erase_failed can take it
 445            right off again.  Silly, but shouldn't happen often. */
 446         list_add(&jeb->list, &c->erasing_list);
 447         spin_unlock(&c->erase_completion_lock);
 448         jffs2_erase_failed(c, jeb, bad_offset);
 449         return;
 450
 451 refile:
 452         /* Stick it back on the list from whence it came and come back later */
 453         jffs2_erase_pending_trigger(c);
 454         spin_lock(&c->erase_completion_lock);
 455         list_add(&jeb->list, &c->erase_complete_list);
 456         spin_unlock(&c->erase_completion_lock);
 457         return;
 458 }