target/linux/generic-2.6/patches/060-rootfs_split.patch

   1 Index: linux/drivers/mtd/Kconfig
   2 ===================================================================
   3 --- linux.orig/drivers/mtd/Kconfig
   4 +++ linux/drivers/mtd/Kconfig
   5 @@ -47,6 +47,16 @@ config MTD_PARTITIONS
   6           devices. Partitioning on NFTL 'devices' is a different - that's the
   7           'normal' form of partitioning used on a block device.
   8
   9 +config MTD_ROOTFS_ROOT_DEV
  10 +       bool "Automatically set 'rootfs' partition to be root filesystem"
  11 +       depends on MTD_PARTITIONS
  12 +       default y
  13 +
  14 +config MTD_ROOTFS_SPLIT
  15 +       bool "Automatically split 'rootfs' partition for squashfs"
  16 +       depends on MTD_PARTITIONS
  17 +       default y
  18 +
  19  config MTD_REDBOOT_PARTS
  20         tristate "RedBoot partition table parsing"
  21         depends on MTD_PARTITIONS
  22 Index: linux/drivers/mtd/mtdpart.c
  23 ===================================================================
  24 --- linux.orig/drivers/mtd/mtdpart.c
  25 +++ linux/drivers/mtd/mtdpart.c
  26 @@ -20,6 +20,8 @@
  27  #include <linux/mtd/mtd.h>
  28  #include <linux/mtd/partitions.h>
  29  #include <linux/mtd/compatmac.h>
  30 +#include <linux/squashfs_fs.h>
  31 +#include <linux/root_dev.h>
  32
  33  /* Our partition linked list */
  34  static LIST_HEAD(mtd_partitions);
  35 @@ -308,6 +310,265 @@ int del_mtd_partitions(struct mtd_info *
  36         return 0;
  37  }
  38
  39 +static u_int32_t cur_offset = 0;
  40 +static int add_one_partition(struct mtd_info *master, const struct mtd_partition *part,
  41 +               int i, struct mtd_part **slp)
  42 +{
  43 +       struct mtd_part *slave;
  44 +
  45 +       /* allocate the partition structure */
  46 +       slave = kzalloc (sizeof(*slave), GFP_KERNEL);
  47 +       if (!slave) {
  48 +               printk ("memory allocation error while creating partitions for \"%s\"\n",
  49 +                       master->name);
  50 +               del_mtd_partitions(master);
  51 +               return -ENOMEM;
  52 +       }
  53 +       list_add(&slave->list, &mtd_partitions);
  54 +
  55 +       /* set up the MTD object for this partition */
  56 +       slave->mtd.type = master->type;
  57 +       slave->mtd.flags = master->flags & ~part->mask_flags;
  58 +       slave->mtd.size = part->size;
  59 +       slave->mtd.writesize = master->writesize;
  60 +       slave->mtd.oobsize = master->oobsize;
  61 +       slave->mtd.oobavail = master->oobavail;
  62 +       slave->mtd.subpage_sft = master->subpage_sft;
  63 +
  64 +       slave->mtd.name = part->name;
  65 +       slave->mtd.owner = master->owner;
  66 +
  67 +       slave->mtd.read = part_read;
  68 +       slave->mtd.write = part_write;
  69 +
  70 +       if(master->point && master->unpoint){
  71 +               slave->mtd.point = part_point;
  72 +               slave->mtd.unpoint = part_unpoint;
  73 +       }
  74 +
  75 +       if (master->read_oob)
  76 +               slave->mtd.read_oob = part_read_oob;
  77 +       if (master->write_oob)
  78 +               slave->mtd.write_oob = part_write_oob;
  79 +       if(master->read_user_prot_reg)
  80 +               slave->mtd.read_user_prot_reg = part_read_user_prot_reg;
  81 +       if(master->read_fact_prot_reg)
  82 +               slave->mtd.read_fact_prot_reg = part_read_fact_prot_reg;
  83 +       if(master->write_user_prot_reg)
  84 +               slave->mtd.write_user_prot_reg = part_write_user_prot_reg;
  85 +       if(master->lock_user_prot_reg)
  86 +               slave->mtd.lock_user_prot_reg = part_lock_user_prot_reg;
  87 +       if(master->get_user_prot_info)
  88 +               slave->mtd.get_user_prot_info = part_get_user_prot_info;
  89 +       if(master->get_fact_prot_info)
  90 +               slave->mtd.get_fact_prot_info = part_get_fact_prot_info;
  91 +       if (master->sync)
  92 +               slave->mtd.sync = part_sync;
  93 +       if (!i && master->suspend && master->resume) {
  94 +                       slave->mtd.suspend = part_suspend;
  95 +                       slave->mtd.resume = part_resume;
  96 +       }
  97 +       if (master->writev)
  98 +               slave->mtd.writev = part_writev;
  99 +       if (master->lock)
 100 +               slave->mtd.lock = part_lock;
 101 +       if (master->unlock)
 102 +               slave->mtd.unlock = part_unlock;
 103 +       if (master->block_isbad)
 104 +               slave->mtd.block_isbad = part_block_isbad;
 105 +       if (master->block_markbad)
 106 +               slave->mtd.block_markbad = part_block_markbad;
 107 +       slave->mtd.erase = part_erase;
 108 +       slave->master = master;
 109 +       slave->offset = part->offset;
 110 +       slave->index = i;
 111 +
 112 +       if (slave->offset == MTDPART_OFS_APPEND)
 113 +               slave->offset = cur_offset;
 114 +       if (slave->offset == MTDPART_OFS_NXTBLK) {
 115 +               slave->offset = cur_offset;
 116 +               if ((cur_offset % master->erasesize) != 0) {
 117 +                       /* Round up to next erasesize */
 118 +                       slave->offset = ((cur_offset / master->erasesize) + 1) * master->erasesize;
 119 +                       printk(KERN_NOTICE "Moving partition %d: "
 120 +                              "0x%08x -> 0x%08x\n", i,
 121 +                              cur_offset, slave->offset);
 122 +               }
 123 +       }
 124 +       if (slave->mtd.size == MTDPART_SIZ_FULL)
 125 +               slave->mtd.size = master->size - slave->offset;
 126 +       cur_offset = slave->offset + slave->mtd.size;
 127 +
 128 +       printk (KERN_NOTICE "0x%08x-0x%08x : \"%s\"\n", slave->offset,
 129 +               slave->offset + slave->mtd.size, slave->mtd.name);
 130 +
 131 +       /* let's do some sanity checks */
 132 +       if (slave->offset >= master->size) {
 133 +                       /* let's register it anyway to preserve ordering */
 134 +               slave->offset = 0;
 135 +               slave->mtd.size = 0;
 136 +               printk ("mtd: partition \"%s\" is out of reach -- disabled\n",
 137 +                       part->name);
 138 +       }
 139 +       if (slave->offset + slave->mtd.size > master->size) {
 140 +               slave->mtd.size = master->size - slave->offset;
 141 +               printk ("mtd: partition \"%s\" extends beyond the end of device \"%s\" -- size truncated to %#x\n",
 142 +                       part->name, master->name, slave->mtd.size);
 143 +       }
 144 +       if (master->numeraseregions>1) {
 145 +               /* Deal with variable erase size stuff */
 146 +               int i;
 147 +               struct mtd_erase_region_info *regions = master->eraseregions;
 148 +
 149 +               /* Find the first erase regions which is part of this partition. */
 150 +               for (i=0; i < master->numeraseregions && slave->offset >= regions[i].offset; i++)
 151 +                       ;
 152 +
 153 +               for (i--; i < master->numeraseregions && slave->offset + slave->mtd.size > regions[i].offset; i++) {
 154 +                       if (slave->mtd.erasesize < regions[i].erasesize) {
 155 +                               slave->mtd.erasesize = regions[i].erasesize;
 156 +                       }
 157 +               }
 158 +       } else {
 159 +               /* Single erase size */
 160 +               slave->mtd.erasesize = master->erasesize;
 161 +       }
 162 +
 163 +       if ((slave->mtd.flags & MTD_WRITEABLE) &&
 164 +           (slave->offset % slave->mtd.erasesize)) {
 165 +               /* Doesn't start on a boundary of major erase size */
 166 +               /* FIXME: Let it be writable if it is on a boundary of _minor_ erase size though */
 167 +               slave->mtd.flags &= ~MTD_WRITEABLE;
 168 +               printk ("mtd: partition \"%s\" doesn't start on an erase block boundary -- force read-only\n",
 169 +                       part->name);
 170 +       }
 171 +       if ((slave->mtd.flags & MTD_WRITEABLE) &&
 172 +           (slave->mtd.size % slave->mtd.erasesize)) {
 173 +               slave->mtd.flags &= ~MTD_WRITEABLE;
 174 +               printk ("mtd: partition \"%s\" doesn't end on an erase block -- force read-only\n",
 175 +                       part->name);
 176 +       }
 177 +
 178 +       slave->mtd.ecclayout = master->ecclayout;
 179 +       if (master->block_isbad) {
 180 +               uint32_t offs = 0;
 181 +
 182 +               while(offs < slave->mtd.size) {
 183 +                       if (master->block_isbad(master,
 184 +                                               offs + slave->offset))
 185 +                               slave->mtd.ecc_stats.badblocks++;
 186 +                       offs += slave->mtd.erasesize;
 187 +               }
 188 +       }
 189 +
 190 +       if(part->mtdp)
 191 +       {       /* store the object pointer (caller may or may not register it */
 192 +               *part->mtdp = &slave->mtd;
 193 +               slave->registered = 0;
 194 +       }
 195 +       else
 196 +       {
 197 +               /* register our partition */
 198 +               add_mtd_device(&slave->mtd);
 199 +               slave->registered = 1;
 200 +       }
 201 +
 202 +       if (slp)
 203 +               *slp = slave;
 204 +
 205 +       return 0;
 206 +}
 207 +
 208 +#ifdef CONFIG_MTD_ROOTFS_SPLIT
 209 +#define ROOTFS_SPLIT_NAME "rootfs_data"
 210 +static int split_squashfs(struct mtd_info *master, struct mtd_partition *old,
 211 +               struct mtd_partition **new)
 212 +{
 213 +       struct mtd_partition *part = NULL;
 214 +       int len;
 215 +       char buf[512];
 216 +       struct squashfs_super_block *sb = (struct squashfs_super_block *) buf;
 217 +       int ret;
 218 +
 219 +       ret = master->read(master, old->offset, sizeof(*sb), &len, buf);
 220 +       if (ret) {
 221 +               printk(KERN_ALERT "split_squashfs: error occured while reading "
 222 +                       "from \"%s\"\n", master->name);
 223 +               goto out;
 224 +       }
 225 +
 226 +       if (len != sizeof(*sb)) {
 227 +               printk(KERN_ALERT "split_squashfs: unable to read superblock "
 228 +                       "from \"%s\"\n", master->name);
 229 +               ret=-1;
 230 +               goto out;
 231 +       }
 232 +
 233 +       if (*((u32 *) buf) != SQUASHFS_MAGIC) {
 234 +               printk(KERN_ALERT "split_squasfs: no squashfs found in \"%s\"\n",
 235 +                       master->name);
 236 +               ret=0;
 237 +               goto out;
 238 +       }
 239 +
 240 +       if (sb->bytes_used <= 0) {
 241 +               printk(KERN_ALERT "split_squashfs: squashfs is empty in \"%s\"\n",
 242 +                       master->name);
 243 +               ret=0;
 244 +               goto out;
 245 +       }
 246 +
 247 +       part = kmalloc(sizeof(*part)+sizeof(ROOTFS_SPLIT_NAME)+1, GFP_KERNEL);
 248 +       if (part == NULL) {
 249 +               printk(KERN_INFO "split_squashfs: no memory for partition \"%s\"\n",
 250 +                       ROOTFS_SPLIT_NAME);
 251 +               ret = -ENOMEM;
 252 +               goto out;
 253 +       }
 254 +
 255 +       part->name = (unsigned char *)&part[1];
 256 +       memcpy(part, old, sizeof(*part));
 257 +       strcpy(part->name, ROOTFS_SPLIT_NAME);
 258 +
 259 +       len = (u32) sb->bytes_used;
 260 +       len += (part->offset & 0x000fffff);
 261 +       len +=  (master->erasesize - 1);
 262 +       len &= ~(master->erasesize - 1);
 263 +       len -= (part->offset & 0x000fffff);
 264 +       part->offset += len;
 265 +       part->size -= len;
 266 +
 267 +       ret = 0;
 268 +
 269 +out:
 270 +       *new = part;
 271 +       return ret;
 272 +}
 273 +
 274 +static int split_rootfs_data(struct mtd_info *master, struct mtd_partition *part,
 275 +               int index)
 276 +{
 277 +       struct mtd_partition *dpart;
 278 +       int ret;
 279 +
 280 +       ret = split_squashfs(master, part, &dpart);
 281 +       if (ret)
 282 +               return ret;
 283 +
 284 +       if (dpart == NULL)
 285 +               return 1;
 286 +
 287 +       printk(KERN_INFO "mtd: partition \"%s\" created automatically, ofs=%lX, len=%lX \n",
 288 +               ROOTFS_SPLIT_NAME, dpart->offset, dpart->size);
 289 +
 290 +       ret = add_one_partition(master, dpart, index, NULL);
 291 +       if (ret)
 292 +               kfree(dpart);
 293 +
 294 +       return ret;
 295 +}
 296 +#endif /* CONFIG_MTD_ROOTFS_SPLIT */
 297 +
 298  /*
 299   * This function, given a master MTD object and a partition table, creates
 300   * and registers slave MTD objects which are bound to the master according to
 301 @@ -320,168 +581,31 @@ int add_mtd_partitions(struct mtd_info *
 302                        int nbparts)
 303  {
 304         struct mtd_part *slave;
 305 -       u_int32_t cur_offset = 0;
 306 -       int i;
 307 +       struct mtd_partition *part;
 308 +       int i, j, ret = 0;
 309
 310         printk (KERN_NOTICE "Creating %d MTD partitions on \"%s\":\n", nbparts, master->name);
 311
 312 -       for (i = 0; i < nbparts; i++) {
 313 -
 314 -               /* allocate the partition structure */
 315 -               slave = kzalloc (sizeof(*slave), GFP_KERNEL);
 316 -               if (!slave) {
 317 -                       printk ("memory allocation error while creating partitions for \"%s\"\n",
 318 -                               master->name);
 319 -                       del_mtd_partitions(master);
 320 -                       return -ENOMEM;
 321 -               }
 322 -               list_add(&slave->list, &mtd_partitions);
 323 -
 324 -               /* set up the MTD object for this partition */
 325 -               slave->mtd.type = master->type;
 326 -               slave->mtd.flags = master->flags & ~parts[i].mask_flags;
 327 -               slave->mtd.size = parts[i].size;
 328 -               slave->mtd.writesize = master->writesize;
 329 -               slave->mtd.oobsize = master->oobsize;
 330 -               slave->mtd.oobavail = master->oobavail;
 331 -               slave->mtd.subpage_sft = master->subpage_sft;
 332 -
 333 -               slave->mtd.name = parts[i].name;
 334 -               slave->mtd.owner = master->owner;
 335 -
 336 -               slave->mtd.read = part_read;
 337 -               slave->mtd.write = part_write;
 338 -
 339 -               if(master->point && master->unpoint){
 340 -                       slave->mtd.point = part_point;
 341 -                       slave->mtd.unpoint = part_unpoint;
 342 -               }
 343 -
 344 -               if (master->read_oob)
 345 -                       slave->mtd.read_oob = part_read_oob;
 346 -               if (master->write_oob)
 347 -                       slave->mtd.write_oob = part_write_oob;
 348 -               if(master->read_user_prot_reg)
 349 -                       slave->mtd.read_user_prot_reg = part_read_user_prot_reg;
 350 -               if(master->read_fact_prot_reg)
 351 -                       slave->mtd.read_fact_prot_reg = part_read_fact_prot_reg;
 352 -               if(master->write_user_prot_reg)
 353 -                       slave->mtd.write_user_prot_reg = part_write_user_prot_reg;
 354 -               if(master->lock_user_prot_reg)
 355 -                       slave->mtd.lock_user_prot_reg = part_lock_user_prot_reg;
 356 -               if(master->get_user_prot_info)
 357 -                       slave->mtd.get_user_prot_info = part_get_user_prot_info;
 358 -               if(master->get_fact_prot_info)
 359 -                       slave->mtd.get_fact_prot_info = part_get_fact_prot_info;
 360 -               if (master->sync)
 361 -                       slave->mtd.sync = part_sync;
 362 -               if (!i && master->suspend && master->resume) {
 363 -                               slave->mtd.suspend = part_suspend;
 364 -                               slave->mtd.resume = part_resume;
 365 -               }
 366 -               if (master->writev)
 367 -                       slave->mtd.writev = part_writev;
 368 -               if (master->lock)
 369 -                       slave->mtd.lock = part_lock;
 370 -               if (master->unlock)
 371 -                       slave->mtd.unlock = part_unlock;
 372 -               if (master->block_isbad)
 373 -                       slave->mtd.block_isbad = part_block_isbad;
 374 -               if (master->block_markbad)
 375 -                       slave->mtd.block_markbad = part_block_markbad;
 376 -               slave->mtd.erase = part_erase;
 377 -               slave->master = master;
 378 -               slave->offset = parts[i].offset;
 379 -               slave->index = i;
 380 -
 381 -               if (slave->offset == MTDPART_OFS_APPEND)
 382 -                       slave->offset = cur_offset;
 383 -               if (slave->offset == MTDPART_OFS_NXTBLK) {
 384 -                       slave->offset = cur_offset;
 385 -                       if ((cur_offset % master->erasesize) != 0) {
 386 -                               /* Round up to next erasesize */
 387 -                               slave->offset = ((cur_offset / master->erasesize) + 1) * master->erasesize;
 388 -                               printk(KERN_NOTICE "Moving partition %d: "
 389 -                                      "0x%08x -> 0x%08x\n", i,
 390 -                                      cur_offset, slave->offset);
 391 -                       }
 392 -               }
 393 -               if (slave->mtd.size == MTDPART_SIZ_FULL)
 394 -                       slave->mtd.size = master->size - slave->offset;
 395 -               cur_offset = slave->offset + slave->mtd.size;
 396 -
 397 -               printk (KERN_NOTICE "0x%08x-0x%08x : \"%s\"\n", slave->offset,
 398 -                       slave->offset + slave->mtd.size, slave->mtd.name);
 399 -
 400 -               /* let's do some sanity checks */
 401 -               if (slave->offset >= master->size) {
 402 -                               /* let's register it anyway to preserve ordering */
 403 -                       slave->offset = 0;
 404 -                       slave->mtd.size = 0;
 405 -                       printk ("mtd: partition \"%s\" is out of reach -- disabled\n",
 406 -                               parts[i].name);
 407 -               }
 408 -               if (slave->offset + slave->mtd.size > master->size) {
 409 -                       slave->mtd.size = master->size - slave->offset;
 410 -                       printk ("mtd: partition \"%s\" extends beyond the end of device \"%s\" -- size truncated to %#x\n",
 411 -                               parts[i].name, master->name, slave->mtd.size);
 412 -               }
 413 -               if (master->numeraseregions>1) {
 414 -                       /* Deal with variable erase size stuff */
 415 -                       int i;
 416 -                       struct mtd_erase_region_info *regions = master->eraseregions;
 417 -
 418 -                       /* Find the first erase regions which is part of this partition. */
 419 -                       for (i=0; i < master->numeraseregions && slave->offset >= regions[i].offset; i++)
 420 -                               ;
 421 -
 422 -                       for (i--; i < master->numeraseregions && slave->offset + slave->mtd.size > regions[i].offset; i++) {
 423 -                               if (slave->mtd.erasesize < regions[i].erasesize) {
 424 -                                       slave->mtd.erasesize = regions[i].erasesize;
 425 -                               }
 426 -                       }
 427 -               } else {
 428 -                       /* Single erase size */
 429 -                       slave->mtd.erasesize = master->erasesize;
 430 -               }
 431 -
 432 -               if ((slave->mtd.flags & MTD_WRITEABLE) &&
 433 -                   (slave->offset % slave->mtd.erasesize)) {
 434 -                       /* Doesn't start on a boundary of major erase size */
 435 -                       /* FIXME: Let it be writable if it is on a boundary of _minor_ erase size though */
 436 -                       slave->mtd.flags &= ~MTD_WRITEABLE;
 437 -                       printk ("mtd: partition \"%s\" doesn't start on an erase block boundary -- force read-only\n",
 438 -                               parts[i].name);
 439 -               }
 440 -               if ((slave->mtd.flags & MTD_WRITEABLE) &&
 441 -                   (slave->mtd.size % slave->mtd.erasesize)) {
 442 -                       slave->mtd.flags &= ~MTD_WRITEABLE;
 443 -                       printk ("mtd: partition \"%s\" doesn't end on an erase block -- force read-only\n",
 444 -                               parts[i].name);
 445 -               }
 446 -
 447 -               slave->mtd.ecclayout = master->ecclayout;
 448 -               if (master->block_isbad) {
 449 -                       uint32_t offs = 0;
 450 -
 451 -                       while(offs < slave->mtd.size) {
 452 -                               if (master->block_isbad(master,
 453 -                                                       offs + slave->offset))
 454 -                                       slave->mtd.ecc_stats.badblocks++;
 455 -                               offs += slave->mtd.erasesize;
 456 +       for (i = 0, j = 0; i < nbparts; i++) {
 457 +               part = (struct mtd_partition *) &parts[i];
 458 +               ret = add_one_partition(master, part, j, &slave);
 459 +               if (ret)
 460 +                       return ret;
 461 +               j++;
 462 +
 463 +               if (strcmp(part->name, "rootfs") == 0 && slave->registered) {
 464 +#if CONFIG_MTD_ROOTFS_ROOT_DEV
 465 +                       if (ROOT_DEV == 0) {
 466 +                               printk(KERN_NOTICE "mtd: partition \"rootfs\" "
 467 +                                       "set to be root filesystem\n");
 468 +                               ROOT_DEV = MKDEV(MTD_BLOCK_MAJOR, slave->mtd.index);
 469                         }
 470 -               }
 471 -
 472 -               if(parts[i].mtdp)
 473 -               {       /* store the object pointer (caller may or may not register it */
 474 -                       *parts[i].mtdp = &slave->mtd;
 475 -                       slave->registered = 0;
 476 -               }
 477 -               else
 478 -               {
 479 -                       /* register our partition */
 480 -                       add_mtd_device(&slave->mtd);
 481 -                       slave->registered = 1;
 482 +#endif
 483 +#if CONFIG_MTD_ROOTFS_SPLIT
 484 +                       ret = split_rootfs_data(master, part, j);
 485 +                       if (ret == 0)
 486 +                               j++;
 487 +#endif
 488                 }
 489         }
 490