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

   1 diff -ur linux.old/drivers/mtd/Kconfig linux.dev/drivers/mtd/Kconfig
   2 --- linux.old/drivers/mtd/Kconfig       2007-01-10 20:10:37.000000000 +0100
   3 +++ linux.dev/drivers/mtd/Kconfig       2007-02-19 23:00:53.739457000 +0100
   4 @@ -49,6 +49,11 @@
   5           devices. Partitioning on NFTL 'devices' is a different - that's the
   6           'normal' form of partitioning used on a block device.
   7
   8 +config MTD_SPLIT_ROOTFS
   9 +       bool "Automatically split rootfs partition for squashfs"
  10 +       depends on MTD_PARTITIONS
  11 +       default y
  12 +
  13  config MTD_REDBOOT_PARTS
  14         tristate "RedBoot partition table parsing"
  15         depends on MTD_PARTITIONS
  16 diff -ur linux.old/drivers/mtd/mtdpart.c linux.dev/drivers/mtd/mtdpart.c
  17 --- linux.old/drivers/mtd/mtdpart.c     2007-01-10 20:10:37.000000000 +0100
  18 +++ linux.dev/drivers/mtd/mtdpart.c     2007-02-20 00:01:38.587355896 +0100
  19 @@ -20,6 +20,8 @@
  20  #include <linux/mtd/mtd.h>
  21  #include <linux/mtd/partitions.h>
  22  #include <linux/mtd/compatmac.h>
  23 +#include <linux/squashfs_fs.h>
  24 +#include <linux/root_dev.h>
  25
  26  /* Our partition linked list */
  27  static LIST_HEAD(mtd_partitions);
  28 @@ -303,6 +305,173 @@
  29         return 0;
  30  }
  31
  32 +static u_int32_t cur_offset = 0;
  33 +static int add_mtd_partition(struct mtd_info *master, const struct mtd_partition *part, int i)
  34 +{
  35 +       struct mtd_part *slave;
  36 +
  37 +       /* allocate the partition structure */
  38 +       slave = kmalloc (sizeof(*slave), GFP_KERNEL);
  39 +       if (!slave) {
  40 +               printk ("memory allocation error while creating partitions for \"%s\"\n",
  41 +                       master->name);
  42 +               del_mtd_partitions(master);
  43 +               return -ENOMEM;
  44 +       }
  45 +       memset(slave, 0, sizeof(*slave));
  46 +       list_add(&slave->list, &mtd_partitions);
  47 +
  48 +       /* set up the MTD object for this partition */
  49 +       slave->mtd.type = master->type;
  50 +       slave->mtd.flags = master->flags & ~part->mask_flags;
  51 +       slave->mtd.size = part->size;
  52 +       slave->mtd.writesize = master->writesize;
  53 +       slave->mtd.oobsize = master->oobsize;
  54 +       slave->mtd.ecctype = master->ecctype;
  55 +       slave->mtd.eccsize = master->eccsize;
  56 +
  57 +       slave->mtd.name = part->name;
  58 +       slave->mtd.bank_size = master->bank_size;
  59 +       slave->mtd.owner = master->owner;
  60 +
  61 +       slave->mtd.read = part_read;
  62 +       slave->mtd.write = part_write;
  63 +
  64 +       if(master->point && master->unpoint){
  65 +               slave->mtd.point = part_point;
  66 +               slave->mtd.unpoint = part_unpoint;
  67 +       }
  68 +
  69 +       if (master->read_oob)
  70 +               slave->mtd.read_oob = part_read_oob;
  71 +       if (master->write_oob)
  72 +               slave->mtd.write_oob = part_write_oob;
  73 +       if(master->read_user_prot_reg)
  74 +               slave->mtd.read_user_prot_reg = part_read_user_prot_reg;
  75 +       if(master->read_fact_prot_reg)
  76 +               slave->mtd.read_fact_prot_reg = part_read_fact_prot_reg;
  77 +       if(master->write_user_prot_reg)
  78 +               slave->mtd.write_user_prot_reg = part_write_user_prot_reg;
  79 +       if(master->lock_user_prot_reg)
  80 +               slave->mtd.lock_user_prot_reg = part_lock_user_prot_reg;
  81 +       if(master->get_user_prot_info)
  82 +               slave->mtd.get_user_prot_info = part_get_user_prot_info;
  83 +       if(master->get_fact_prot_info)
  84 +               slave->mtd.get_fact_prot_info = part_get_fact_prot_info;
  85 +       if (master->sync)
  86 +               slave->mtd.sync = part_sync;
  87 +       if (!i && master->suspend && master->resume) {
  88 +                       slave->mtd.suspend = part_suspend;
  89 +                       slave->mtd.resume = part_resume;
  90 +       }
  91 +       if (master->writev)
  92 +               slave->mtd.writev = part_writev;
  93 +       if (master->lock)
  94 +               slave->mtd.lock = part_lock;
  95 +       if (master->unlock)
  96 +               slave->mtd.unlock = part_unlock;
  97 +       if (master->block_isbad)
  98 +               slave->mtd.block_isbad = part_block_isbad;
  99 +       if (master->block_markbad)
 100 +               slave->mtd.block_markbad = part_block_markbad;
 101 +       slave->mtd.erase = part_erase;
 102 +       slave->master = master;
 103 +       slave->offset = part->offset;
 104 +       slave->index = i;
 105 +
 106 +       if (slave->offset == MTDPART_OFS_APPEND)
 107 +               slave->offset = cur_offset;
 108 +       if (slave->offset == MTDPART_OFS_NXTBLK) {
 109 +               slave->offset = cur_offset;
 110 +               if ((cur_offset % master->erasesize) != 0) {
 111 +                       /* Round up to next erasesize */
 112 +                       slave->offset = ((cur_offset / master->erasesize) + 1) * master->erasesize;
 113 +                       printk(KERN_NOTICE "Moving partition %d: "
 114 +                              "0x%08x -> 0x%08x\n", i,
 115 +                              cur_offset, slave->offset);
 116 +               }
 117 +       }
 118 +       if (slave->mtd.size == MTDPART_SIZ_FULL)
 119 +               slave->mtd.size = master->size - slave->offset;
 120 +       cur_offset = slave->offset + slave->mtd.size;
 121 +
 122 +       printk (KERN_NOTICE "0x%08x-0x%08x : \"%s\"\n", slave->offset,
 123 +               slave->offset + slave->mtd.size, slave->mtd.name);
 124 +
 125 +       /* let's do some sanity checks */
 126 +       if (slave->offset >= master->size) {
 127 +                       /* let's register it anyway to preserve ordering */
 128 +               slave->offset = 0;
 129 +               slave->mtd.size = 0;
 130 +               printk ("mtd: partition \"%s\" is out of reach -- disabled\n",
 131 +                       part->name);
 132 +       }
 133 +       if (slave->offset + slave->mtd.size > master->size) {
 134 +               slave->mtd.size = master->size - slave->offset;
 135 +               printk ("mtd: partition \"%s\" extends beyond the end of device \"%s\" -- size truncated to %#x\n",
 136 +                       part->name, master->name, slave->mtd.size);
 137 +       }
 138 +       if (master->numeraseregions>1) {
 139 +               /* Deal with variable erase size stuff */
 140 +               int i;
 141 +               struct mtd_erase_region_info *regions = master->eraseregions;
 142 +
 143 +               /* Find the first erase regions which is part of this partition. */
 144 +               for (i=0; i < master->numeraseregions && slave->offset >= regions[i].offset; i++)
 145 +                       ;
 146 +
 147 +               for (i--; i < master->numeraseregions && slave->offset + slave->mtd.size > regions[i].offset; i++) {
 148 +                       if (slave->mtd.erasesize < regions[i].erasesize) {
 149 +                               slave->mtd.erasesize = regions[i].erasesize;
 150 +                       }
 151 +               }
 152 +       } else {
 153 +               /* Single erase size */
 154 +               slave->mtd.erasesize = master->erasesize;
 155 +       }
 156 +
 157 +       if ((slave->mtd.flags & MTD_WRITEABLE) &&
 158 +           (slave->offset % slave->mtd.erasesize)) {
 159 +               /* Doesn't start on a boundary of major erase size */
 160 +               /* FIXME: Let it be writable if it is on a boundary of _minor_ erase size though */
 161 +               slave->mtd.flags &= ~MTD_WRITEABLE;
 162 +               printk ("mtd: partition \"%s\" doesn't start on an erase block boundary -- force read-only\n",
 163 +                       part->name);
 164 +       }
 165 +       if ((slave->mtd.flags & MTD_WRITEABLE) &&
 166 +           (slave->mtd.size % slave->mtd.erasesize)) {
 167 +               slave->mtd.flags &= ~MTD_WRITEABLE;
 168 +               printk ("mtd: partition \"%s\" doesn't end on an erase block -- force read-only\n",
 169 +                       part->name);
 170 +       }
 171 +
 172 +       slave->mtd.ecclayout = master->ecclayout;
 173 +       if (master->block_isbad) {
 174 +               uint32_t offs = 0;
 175 +
 176 +               while(offs < slave->mtd.size) {
 177 +                       if (master->block_isbad(master,
 178 +                                               offs + slave->offset))
 179 +                               slave->mtd.ecc_stats.badblocks++;
 180 +                       offs += slave->mtd.erasesize;
 181 +               }
 182 +       }
 183 +
 184 +       if(part->mtdp)
 185 +       {       /* store the object pointer (caller may or may not register it */
 186 +               *part->mtdp = &slave->mtd;
 187 +               slave->registered = 0;
 188 +       }
 189 +       else
 190 +       {
 191 +               /* register our partition */
 192 +               add_mtd_device(&slave->mtd);
 193 +               slave->registered = 1;
 194 +       }
 195 +
 196 +       return 0;
 197 +}
 198 +
 199  /*
 200   * This function, given a master MTD object and a partition table, creates
 201   * and registers slave MTD objects which are bound to the master according to
 202 @@ -314,171 +483,53 @@
 203                        const struct mtd_partition *parts,
 204                        int nbparts)
 205  {
 206 -       struct mtd_part *slave;
 207 -       u_int32_t cur_offset = 0;
 208 -       int i;
 209 +       struct mtd_partition *part;
 210 +       int i, ret = 0;
 211
 212         printk (KERN_NOTICE "Creating %d MTD partitions on \"%s\":\n", nbparts, master->name);
 213
 214         for (i = 0; i < nbparts; i++) {
 215 +               part = (struct mtd_partition *) &parts[i];
 216 +               ret = add_mtd_partition(master, part, i);
 217 +               if (ret)
 218 +                       return ret;
 219 +               if (strcmp(part->name, "rootfs") == 0) {
 220 +#ifdef CONFIG_MTD_SPLIT_ROOTFS
 221 +                       int len;
 222 +                       char buf[512];
 223 +                       struct squashfs_super_block *sb = (struct squashfs_super_block *) buf;
 224 +#define ROOTFS_SPLIT_NAME "rootfs_data"
 225 +                       if ((master->read(master, part->offset, sizeof(struct squashfs_super_block), &len, buf) == 0) &&
 226 +                                       (len == sizeof(struct squashfs_super_block)) &&
 227 +                                       (*((u32 *) buf) == SQUASHFS_MAGIC) &&
 228 +                                       (sb->bytes_used > 0)) {
 229 +
 230 +
 231 +                               part = kmalloc(sizeof(struct mtd_partition), GFP_KERNEL);
 232 +                               memcpy(part, &parts[i], sizeof(struct mtd_partition));
 233 +
 234 +                               part->name = kmalloc(sizeof(ROOTFS_SPLIT_NAME) + 1, GFP_KERNEL);
 235 +                               strcpy(part->name, ROOTFS_SPLIT_NAME);
 236 +
 237 +                               len = (u32) sb->bytes_used;
 238 +                               len += (part->offset & 0x000fffff);
 239 +                               len +=  (master->erasesize - 1);
 240 +                               len &= ~(master->erasesize - 1);
 241 +                               len -= (part->offset & 0x000fffff);
 242 +                               part->offset += len;
 243 +                               part->size -= len;
 244 +
 245 +                               if (master->erasesize <= part->size)
 246 +                                       ret = add_mtd_partition(master, part, i + 1);
 247 +                               else
 248 +                                       kfree(part->name);
 249 +                               if (ret)
 250 +                                       return ret;
 251
 252 -               /* allocate the partition structure */
 253 -               slave = kmalloc (sizeof(*slave), GFP_KERNEL);
 254 -               if (!slave) {
 255 -                       printk ("memory allocation error while creating partitions for \"%s\"\n",
 256 -                               master->name);
 257 -                       del_mtd_partitions(master);
 258 -                       return -ENOMEM;
 259 -               }
 260 -               memset(slave, 0, sizeof(*slave));
 261 -               list_add(&slave->list, &mtd_partitions);
 262 -
 263 -               /* set up the MTD object for this partition */
 264 -               slave->mtd.type = master->type;
 265 -               slave->mtd.flags = master->flags & ~parts[i].mask_flags;
 266 -               slave->mtd.size = parts[i].size;
 267 -               slave->mtd.writesize = master->writesize;
 268 -               slave->mtd.oobsize = master->oobsize;
 269 -               slave->mtd.ecctype = master->ecctype;
 270 -               slave->mtd.eccsize = master->eccsize;
 271 -
 272 -               slave->mtd.name = parts[i].name;
 273 -               slave->mtd.bank_size = master->bank_size;
 274 -               slave->mtd.owner = master->owner;
 275 -
 276 -               slave->mtd.read = part_read;
 277 -               slave->mtd.write = part_write;
 278 -
 279 -               if(master->point && master->unpoint){
 280 -                       slave->mtd.point = part_point;
 281 -                       slave->mtd.unpoint = part_unpoint;
 282 -               }
 283 -
 284 -               if (master->read_oob)
 285 -                       slave->mtd.read_oob = part_read_oob;
 286 -               if (master->write_oob)
 287 -                       slave->mtd.write_oob = part_write_oob;
 288 -               if(master->read_user_prot_reg)
 289 -                       slave->mtd.read_user_prot_reg = part_read_user_prot_reg;
 290 -               if(master->read_fact_prot_reg)
 291 -                       slave->mtd.read_fact_prot_reg = part_read_fact_prot_reg;
 292 -               if(master->write_user_prot_reg)
 293 -                       slave->mtd.write_user_prot_reg = part_write_user_prot_reg;
 294 -               if(master->lock_user_prot_reg)
 295 -                       slave->mtd.lock_user_prot_reg = part_lock_user_prot_reg;
 296 -               if(master->get_user_prot_info)
 297 -                       slave->mtd.get_user_prot_info = part_get_user_prot_info;
 298 -               if(master->get_fact_prot_info)
 299 -                       slave->mtd.get_fact_prot_info = part_get_fact_prot_info;
 300 -               if (master->sync)
 301 -                       slave->mtd.sync = part_sync;
 302 -               if (!i && master->suspend && master->resume) {
 303 -                               slave->mtd.suspend = part_suspend;
 304 -                               slave->mtd.resume = part_resume;
 305 -               }
 306 -               if (master->writev)
 307 -                       slave->mtd.writev = part_writev;
 308 -               if (master->lock)
 309 -                       slave->mtd.lock = part_lock;
 310 -               if (master->unlock)
 311 -                       slave->mtd.unlock = part_unlock;
 312 -               if (master->block_isbad)
 313 -                       slave->mtd.block_isbad = part_block_isbad;
 314 -               if (master->block_markbad)
 315 -                       slave->mtd.block_markbad = part_block_markbad;
 316 -               slave->mtd.erase = part_erase;
 317 -               slave->master = master;
 318 -               slave->offset = parts[i].offset;
 319 -               slave->index = i;
 320 -
 321 -               if (slave->offset == MTDPART_OFS_APPEND)
 322 -                       slave->offset = cur_offset;
 323 -               if (slave->offset == MTDPART_OFS_NXTBLK) {
 324 -                       slave->offset = cur_offset;
 325 -                       if ((cur_offset % master->erasesize) != 0) {
 326 -                               /* Round up to next erasesize */
 327 -                               slave->offset = ((cur_offset / master->erasesize) + 1) * master->erasesize;
 328 -                               printk(KERN_NOTICE "Moving partition %d: "
 329 -                                      "0x%08x -> 0x%08x\n", i,
 330 -                                      cur_offset, slave->offset);
 331 +                               kfree(part);
 332                         }
 333 -               }
 334 -               if (slave->mtd.size == MTDPART_SIZ_FULL)
 335 -                       slave->mtd.size = master->size - slave->offset;
 336 -               cur_offset = slave->offset + slave->mtd.size;
 337 -
 338 -               printk (KERN_NOTICE "0x%08x-0x%08x : \"%s\"\n", slave->offset,
 339 -                       slave->offset + slave->mtd.size, slave->mtd.name);
 340 -
 341 -               /* let's do some sanity checks */
 342 -               if (slave->offset >= master->size) {
 343 -                               /* let's register it anyway to preserve ordering */
 344 -                       slave->offset = 0;
 345 -                       slave->mtd.size = 0;
 346 -                       printk ("mtd: partition \"%s\" is out of reach -- disabled\n",
 347 -                               parts[i].name);
 348 -               }
 349 -               if (slave->offset + slave->mtd.size > master->size) {
 350 -                       slave->mtd.size = master->size - slave->offset;
 351 -                       printk ("mtd: partition \"%s\" extends beyond the end of device \"%s\" -- size truncated to %#x\n",
 352 -                               parts[i].name, master->name, slave->mtd.size);
 353 -               }
 354 -               if (master->numeraseregions>1) {
 355 -                       /* Deal with variable erase size stuff */
 356 -                       int i;
 357 -                       struct mtd_erase_region_info *regions = master->eraseregions;
 358 -
 359 -                       /* Find the first erase regions which is part of this partition. */
 360 -                       for (i=0; i < master->numeraseregions && slave->offset >= regions[i].offset; i++)
 361 -                               ;
 362 -
 363 -                       for (i--; i < master->numeraseregions && slave->offset + slave->mtd.size > regions[i].offset; i++) {
 364 -                               if (slave->mtd.erasesize < regions[i].erasesize) {
 365 -                                       slave->mtd.erasesize = regions[i].erasesize;
 366 -                               }
 367 -                       }
 368 -               } else {
 369 -                       /* Single erase size */
 370 -                       slave->mtd.erasesize = master->erasesize;
 371 -               }
 372 -
 373 -               if ((slave->mtd.flags & MTD_WRITEABLE) &&
 374 -                   (slave->offset % slave->mtd.erasesize)) {
 375 -                       /* Doesn't start on a boundary of major erase size */
 376 -                       /* FIXME: Let it be writable if it is on a boundary of _minor_ erase size though */
 377 -                       slave->mtd.flags &= ~MTD_WRITEABLE;
 378 -                       printk ("mtd: partition \"%s\" doesn't start on an erase block boundary -- force read-only\n",
 379 -                               parts[i].name);
 380 -               }
 381 -               if ((slave->mtd.flags & MTD_WRITEABLE) &&
 382 -                   (slave->mtd.size % slave->mtd.erasesize)) {
 383 -                       slave->mtd.flags &= ~MTD_WRITEABLE;
 384 -                       printk ("mtd: partition \"%s\" doesn't end on an erase block -- force read-only\n",
 385 -                               parts[i].name);
 386 -               }
 387 -
 388 -               slave->mtd.ecclayout = master->ecclayout;
 389 -               if (master->block_isbad) {
 390 -                       uint32_t offs = 0;
 391 -
 392 -                       while(offs < slave->mtd.size) {
 393 -                               if (master->block_isbad(master,
 394 -                                                       offs + slave->offset))
 395 -                                       slave->mtd.ecc_stats.badblocks++;
 396 -                               offs += slave->mtd.erasesize;
 397 -                       }
 398 -               }
 399 -
 400 -               if(parts[i].mtdp)
 401 -               {       /* store the object pointer (caller may or may not register it */
 402 -                       *parts[i].mtdp = &slave->mtd;
 403 -                       slave->registered = 0;
 404 -               }
 405 -               else
 406 -               {
 407 -                       /* register our partition */
 408 -                       add_mtd_device(&slave->mtd);
 409 -                       slave->registered = 1;
 410 +#endif /* CONFIG_MTD_SPLIT_ROOTFS */
 411 +                       ROOT_DEV = MKDEV(MTD_BLOCK_MAJOR, i);
 412                 }
 413         }
 414