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   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 1.85 2005/09/20 14:53:15 dedekind 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 %#08x (range %#08x-%#08x)\n",
  52                                 jeb->offset, jeb->offset, jeb->offset + c->sector_size));
  53         instr = kmalloc(sizeof(struct erase_info) + sizeof(struct erase_priv_struct), GFP_KERNEL);
  54         if (!instr) {
  55                 printk(KERN_WARNING "kmalloc for struct erase_info in jffs2_erase_block failed. Refiling block for later\n");
  56                 spin_lock(&c->erase_completion_lock);
  57                 list_del(&jeb->list);
  58                 list_add(&jeb->list, &c->erase_pending_list);
  59                 c->erasing_size -= c->sector_size;
  60                 c->dirty_size += c->sector_size;
  61                 jeb->dirty_size = c->sector_size;
  62                 spin_unlock(&c->erase_completion_lock);
  63                 return;
  64         }
  65
  66         memset(instr, 0, sizeof(*instr));
  67
  68         instr->mtd = c->mtd;
  69         instr->addr = jeb->offset;
  70         instr->len = c->sector_size;
  71         instr->callback = jffs2_erase_callback;
  72         instr->priv = (unsigned long)(&instr[1]);
  73         instr->fail_addr = 0xffffffff;
  74
  75         ((struct erase_priv_struct *)instr->priv)->jeb = jeb;
  76         ((struct erase_priv_struct *)instr->priv)->c = c;
  77
  78         ret = c->mtd->erase(c->mtd, instr);
  79         if (!ret)
  80                 return;
  81
  82         bad_offset = instr->fail_addr;
  83         kfree(instr);
  84 #endif /* __ECOS */
  85
  86         if (ret == -ENOMEM || ret == -EAGAIN) {
  87                 /* Erase failed immediately. Refile it on the list */
  88                 D1(printk(KERN_DEBUG "Erase at 0x%08x failed: %d. Refiling on erase_pending_list\n", jeb->offset, ret));
  89                 spin_lock(&c->erase_completion_lock);
  90                 list_del(&jeb->list);
  91                 list_add(&jeb->list, &c->erase_pending_list);
  92                 c->erasing_size -= c->sector_size;
  93                 c->dirty_size += c->sector_size;
  94                 jeb->dirty_size = c->sector_size;
  95                 spin_unlock(&c->erase_completion_lock);
  96                 return;
  97         }
  98
  99         if (ret == -EROFS)
 100                 printk(KERN_WARNING "Erase at 0x%08x failed immediately: -EROFS. Is the sector locked?\n", jeb->offset);
 101         else
 102                 printk(KERN_WARNING "Erase at 0x%08x failed immediately: errno %d\n", jeb->offset, ret);
 103
 104         jffs2_erase_failed(c, jeb, bad_offset);
 105 }
 106
 107 void jffs2_erase_pending_blocks(struct jffs2_sb_info *c, int count)
 108 {
 109         struct jffs2_eraseblock *jeb;
 110
 111         down(&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_del(&jeb->list);
 121                         spin_unlock(&c->erase_completion_lock);
 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_all_node_refs(c, jeb);
 140                         list_add(&jeb->list, &c->erasing_list);
 141                         spin_unlock(&c->erase_completion_lock);
 142
 143                         jffs2_erase_block(c, jeb);
 144
 145                 } else {
 146                         BUG();
 147                 }
 148
 149                 /* Be nice */
 150                 cond_resched();
 151                 spin_lock(&c->erase_completion_lock);
 152         }
 153
 154         spin_unlock(&c->erase_completion_lock);
 155  done:
 156         D1(printk(KERN_DEBUG "jffs2_erase_pending_blocks completed\n"));
 157
 158         up(&c->erase_free_sem);
 159 }
 160
 161 static void jffs2_erase_succeeded(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb)
 162 {
 163         D1(printk(KERN_DEBUG "Erase completed successfully at 0x%08x\n", jeb->offset));
 164         spin_lock(&c->erase_completion_lock);
 165         list_del(&jeb->list);
 166         list_add_tail(&jeb->list, &c->erase_complete_list);
 167         spin_unlock(&c->erase_completion_lock);
 168         /* Ensure that kupdated calls us again to mark them clean */
 169         jffs2_erase_pending_trigger(c);
 170 }
 171
 172 static void jffs2_erase_failed(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, uint32_t bad_offset)
 173 {
 174         /* For NAND, if the failure did not occur at the device level for a
 175            specific physical page, don't bother updating the bad block table. */
 176         if (jffs2_cleanmarker_oob(c) && (bad_offset != 0xffffffff)) {
 177                 /* We had a device-level failure to erase.  Let's see if we've
 178                    failed too many times. */
 179                 if (!jffs2_write_nand_badblock(c, jeb, bad_offset)) {
 180                         /* We'd like to give this block another try. */
 181                         spin_lock(&c->erase_completion_lock);
 182                         list_del(&jeb->list);
 183                         list_add(&jeb->list, &c->erase_pending_list);
 184                         c->erasing_size -= c->sector_size;
 185                         c->dirty_size += c->sector_size;
 186                         jeb->dirty_size = c->sector_size;
 187                         spin_unlock(&c->erase_completion_lock);
 188                         return;
 189                 }
 190         }
 191
 192         spin_lock(&c->erase_completion_lock);
 193         c->erasing_size -= c->sector_size;
 194         c->bad_size += c->sector_size;
 195         list_del(&jeb->list);
 196         list_add(&jeb->list, &c->bad_list);
 197         c->nr_erasing_blocks--;
 198         spin_unlock(&c->erase_completion_lock);
 199         wake_up(&c->erase_wait);
 200 }
 201
 202 #ifndef __ECOS
 203 static void jffs2_erase_callback(struct erase_info *instr)
 204 {
 205         struct erase_priv_struct *priv = (void *)instr->priv;
 206
 207         if(instr->state != MTD_ERASE_DONE) {
 208                 printk(KERN_WARNING "Erase at 0x%08x finished, but state != MTD_ERASE_DONE. State is 0x%x instead.\n", instr->addr, instr->state);
 209                 jffs2_erase_failed(priv->c, priv->jeb, instr->fail_addr);
 210         } else {
 211                 jffs2_erase_succeeded(priv->c, priv->jeb);
 212         }
 213         kfree(instr);
 214 }
 215 #endif /* !__ECOS */
 216
 217 /* Hmmm. Maybe we should accept the extra space it takes and make
 218    this a standard doubly-linked list? */
 219 static inline void jffs2_remove_node_refs_from_ino_list(struct jffs2_sb_info *c,
 220                         struct jffs2_raw_node_ref *ref, struct jffs2_eraseblock *jeb)
 221 {
 222         struct jffs2_inode_cache *ic = NULL;
 223         struct jffs2_raw_node_ref **prev;
 224
 225         prev = &ref->next_in_ino;
 226
 227         /* Walk the inode's list once, removing any nodes from this eraseblock */
 228         while (1) {
 229                 if (!(*prev)->next_in_ino) {
 230                         /* We're looking at the jffs2_inode_cache, which is
 231                            at the end of the linked list. Stash it and continue
 232                            from the beginning of the list */
 233                         ic = (struct jffs2_inode_cache *)(*prev);
 234                         prev = &ic->nodes;
 235                         continue;
 236                 }
 237
 238                 if (SECTOR_ADDR((*prev)->flash_offset) == jeb->offset) {
 239                         /* It's in the block we're erasing */
 240                         struct jffs2_raw_node_ref *this;
 241
 242                         this = *prev;
 243                         *prev = this->next_in_ino;
 244                         this->next_in_ino = NULL;
 245
 246                         if (this == ref)
 247                                 break;
 248
 249                         continue;
 250                 }
 251                 /* Not to be deleted. Skip */
 252                 prev = &((*prev)->next_in_ino);
 253         }
 254
 255         /* PARANOIA */
 256         if (!ic) {
 257                 printk(KERN_WARNING "inode_cache not found in remove_node_refs()!!\n");
 258                 return;
 259         }
 260
 261         D1(printk(KERN_DEBUG "Removed nodes in range 0x%08x-0x%08x from ino #%u\n",
 262                   jeb->offset, jeb->offset + c->sector_size, ic->ino));
 263
 264         D2({
 265                 int i=0;
 266                 struct jffs2_raw_node_ref *this;
 267                 printk(KERN_DEBUG "After remove_node_refs_from_ino_list: \n" KERN_DEBUG);
 268
 269                 this = ic->nodes;
 270
 271                 while(this) {
 272                         printk( "0x%08x(%d)->", ref_offset(this), ref_flags(this));
 273                         if (++i == 5) {
 274                                 printk("\n" KERN_DEBUG);
 275                                 i=0;
 276                         }
 277                         this = this->next_in_ino;
 278                 }
 279                 printk("\n");
 280         });
 281
 282         if (ic->nodes == (void *)ic && ic->nlink == 0)
 283                 jffs2_del_ino_cache(c, ic);
 284 }
 285
 286 static void jffs2_free_all_node_refs(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb)
 287 {
 288         struct jffs2_raw_node_ref *ref;
 289         D1(printk(KERN_DEBUG "Freeing all node refs for eraseblock offset 0x%08x\n", jeb->offset));
 290         while(jeb->first_node) {
 291                 ref = jeb->first_node;
 292                 jeb->first_node = ref->next_phys;
 293
 294                 /* Remove from the inode-list */
 295                 if (ref->next_in_ino)
 296                         jffs2_remove_node_refs_from_ino_list(c, ref, jeb);
 297                 /* else it was a non-inode node or already removed, so don't bother */
 298
 299                 jffs2_free_raw_node_ref(ref);
 300         }
 301         jeb->last_node = NULL;
 302 }
 303
 304 static int jffs2_block_check_erase(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, uint32_t *bad_offset)
 305 {
 306         void *ebuf;
 307         uint32_t ofs;
 308         size_t retlen;
 309         int ret = -EIO;
 310
 311         ebuf = kmalloc(PAGE_SIZE, GFP_KERNEL);
 312         if (!ebuf) {
 313                 printk(KERN_WARNING "Failed to allocate page buffer for verifying erase at 0x%08x. Refiling\n", jeb->offset);
 314                 return -EAGAIN;
 315         }
 316
 317         D1(printk(KERN_DEBUG "Verifying erase at 0x%08x\n", jeb->offset));
 318
 319         for (ofs = jeb->offset; ofs < jeb->offset + c->sector_size; ) {
 320                 uint32_t readlen = min((uint32_t)PAGE_SIZE, jeb->offset + c->sector_size - ofs);
 321                 int i;
 322
 323                 *bad_offset = ofs;
 324
 325                 ret = jffs2_flash_read(c, ofs, readlen, &retlen, ebuf);
 326                 if (ret) {
 327                         printk(KERN_WARNING "Read of newly-erased block at 0x%08x failed: %d. Putting on bad_list\n", ofs, ret);
 328                         goto fail;
 329                 }
 330                 if (retlen != readlen) {
 331                         printk(KERN_WARNING "Short read from newly-erased block at 0x%08x. Wanted %d, got %zd\n", ofs, readlen, retlen);
 332                         goto fail;
 333                 }
 334                 for (i=0; i<readlen; i += sizeof(unsigned long)) {
 335                         /* It's OK. We know it's properly aligned */
 336                         unsigned long *datum = ebuf + i;
 337                         if (*datum + 1) {
 338                                 *bad_offset += i;
 339                                 printk(KERN_WARNING "Newly-erased block contained word 0x%lx at offset 0x%08x\n", *datum, *bad_offset);
 340                                 goto fail;
 341                         }
 342                 }
 343                 ofs += readlen;
 344                 cond_resched();
 345         }
 346         ret = 0;
 347 fail:
 348         kfree(ebuf);
 349         return ret;
 350 }
 351
 352 static void jffs2_mark_erased_block(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb)
 353 {
 354         struct jffs2_raw_node_ref *marker_ref = NULL;
 355         size_t retlen;
 356         int ret;
 357         uint32_t bad_offset;
 358
 359         switch (jffs2_block_check_erase(c, jeb, &bad_offset)) {
 360         case -EAGAIN:   goto refile;
 361         case -EIO:      goto filebad;
 362         }
 363
 364         /* Write the erase complete marker */
 365         D1(printk(KERN_DEBUG "Writing erased marker to block at 0x%08x\n", jeb->offset));
 366         bad_offset = jeb->offset;
 367
 368         /* Cleanmarker in oob area or no cleanmarker at all ? */
 369         if (jffs2_cleanmarker_oob(c) || c->cleanmarker_size == 0) {
 370
 371                 if (jffs2_cleanmarker_oob(c)) {
 372                         if (jffs2_write_nand_cleanmarker(c, jeb))
 373                                 goto filebad;
 374                 }
 375
 376                 /* Everything else got zeroed before the erase */
 377                 jeb->free_size = c->sector_size;
 378         } else {
 379
 380                 struct kvec vecs[1];
 381                 struct jffs2_unknown_node marker = {
 382                         .magic =        cpu_to_je16(JFFS2_MAGIC_BITMASK),
 383                         .nodetype =     cpu_to_je16(JFFS2_NODETYPE_CLEANMARKER),
 384                         .totlen =       cpu_to_je32(c->cleanmarker_size)
 385                 };
 386
 387                 marker_ref = jffs2_alloc_raw_node_ref();
 388                 if (!marker_ref) {
 389                         printk(KERN_WARNING "Failed to allocate raw node ref for clean marker. Refiling\n");
 390                         goto refile;
 391                 }
 392
 393                 marker.hdr_crc = cpu_to_je32(crc32(0, &marker, sizeof(struct jffs2_unknown_node)-4));
 394
 395                 vecs[0].iov_base = (unsigned char *) &marker;
 396                 vecs[0].iov_len = sizeof(marker);
 397                 ret = jffs2_flash_direct_writev(c, vecs, 1, jeb->offset, &retlen);
 398
 399                 if (ret || retlen != sizeof(marker)) {
 400                         if (ret)
 401                                 printk(KERN_WARNING "Write clean marker to block at 0x%08x failed: %d\n",
 402                                        jeb->offset, ret);
 403                         else
 404                                 printk(KERN_WARNING "Short write to newly-erased block at 0x%08x: Wanted %zd, got %zd\n",
 405                                        jeb->offset, sizeof(marker), retlen);
 406
 407                         jffs2_free_raw_node_ref(marker_ref);
 408                         goto filebad;
 409                 }
 410
 411                 /* Everything else got zeroed before the erase */
 412                 jeb->free_size = c->sector_size;
 413
 414                 marker_ref->next_in_ino = NULL;
 415                 marker_ref->flash_offset = jeb->offset | REF_NORMAL;
 416
 417                 jffs2_link_node_ref(c, jeb, marker_ref, c->cleanmarker_size);
 418         }
 419
 420         spin_lock(&c->erase_completion_lock);
 421         c->erasing_size -= c->sector_size;
 422         c->free_size += jeb->free_size;
 423         c->used_size += jeb->used_size;
 424
 425         jffs2_dbg_acct_sanity_check_nolock(c,jeb);
 426         jffs2_dbg_acct_paranoia_check_nolock(c, jeb);
 427
 428         list_add_tail(&jeb->list, &c->free_list);
 429         c->nr_erasing_blocks--;
 430         c->nr_free_blocks++;
 431         spin_unlock(&c->erase_completion_lock);
 432         wake_up(&c->erase_wait);
 433         return;
 434
 435 filebad:
 436         spin_lock(&c->erase_completion_lock);
 437         /* Stick it on a list (any list) so erase_failed can take it
 438            right off again.  Silly, but shouldn't happen often. */
 439         list_add(&jeb->list, &c->erasing_list);
 440         spin_unlock(&c->erase_completion_lock);
 441         jffs2_erase_failed(c, jeb, bad_offset);
 442         return;
 443
 444 refile:
 445         /* Stick it back on the list from whence it came and come back later */
 446         jffs2_erase_pending_trigger(c);
 447         spin_lock(&c->erase_completion_lock);
 448         list_add(&jeb->list, &c->erase_complete_list);
 449         spin_unlock(&c->erase_completion_lock);
 450         return;
 451 }