target/linux/generic-2.6/patches-2.6.22/060-rootfs_split.patch

   1 diff -urN linux-2.6.21.1.old/drivers/mtd/Kconfig linux-2.6.21.1.dev/drivers/mtd/Kconfig
   2 --- linux-2.6.21.1.old/drivers/mtd/Kconfig      2007-04-27 23:49:26.000000000 +0200
   3 +++ linux-2.6.21.1.dev/drivers/mtd/Kconfig      2007-05-26 19:58:42.320520952 +0200
   4 @@ -47,6 +47,11 @@
   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 -urN linux-2.6.21.1.old/drivers/mtd/mtdpart.c linux-2.6.21.1.dev/drivers/mtd/mtdpart.c
  17 --- linux-2.6.21.1.old/drivers/mtd/mtdpart.c    2007-04-27 23:49:26.000000000 +0200
  18 +++ linux-2.6.21.1.dev/drivers/mtd/mtdpart.c    2007-05-26 19:58:42.331519280 +0200
  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 @@ -308,6 +310,171 @@
  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 = kzalloc (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 +       list_add(&slave->list, &mtd_partitions);
  46 +
  47 +       /* set up the MTD object for this partition */
  48 +       slave->mtd.type = master->type;
  49 +       slave->mtd.flags = master->flags & ~part->mask_flags;
  50 +       slave->mtd.size = part->size;
  51 +       slave->mtd.writesize = master->writesize;
  52 +       slave->mtd.oobsize = master->oobsize;
  53 +       slave->mtd.oobavail = master->oobavail;
  54 +       slave->mtd.subpage_sft = master->subpage_sft;
  55 +
  56 +       slave->mtd.name = part->name;
  57 +       slave->mtd.owner = master->owner;
  58 +
  59 +       slave->mtd.read = part_read;
  60 +       slave->mtd.write = part_write;
  61 +
  62 +       if(master->point && master->unpoint){
  63 +               slave->mtd.point = part_point;
  64 +               slave->mtd.unpoint = part_unpoint;
  65 +       }
  66 +
  67 +       if (master->read_oob)
  68 +               slave->mtd.read_oob = part_read_oob;
  69 +       if (master->write_oob)
  70 +               slave->mtd.write_oob = part_write_oob;
  71 +       if(master->read_user_prot_reg)
  72 +               slave->mtd.read_user_prot_reg = part_read_user_prot_reg;
  73 +       if(master->read_fact_prot_reg)
  74 +               slave->mtd.read_fact_prot_reg = part_read_fact_prot_reg;
  75 +       if(master->write_user_prot_reg)
  76 +               slave->mtd.write_user_prot_reg = part_write_user_prot_reg;
  77 +       if(master->lock_user_prot_reg)
  78 +               slave->mtd.lock_user_prot_reg = part_lock_user_prot_reg;
  79 +       if(master->get_user_prot_info)
  80 +               slave->mtd.get_user_prot_info = part_get_user_prot_info;
  81 +       if(master->get_fact_prot_info)
  82 +               slave->mtd.get_fact_prot_info = part_get_fact_prot_info;
  83 +       if (master->sync)
  84 +               slave->mtd.sync = part_sync;
  85 +       if (!i && master->suspend && master->resume) {
  86 +                       slave->mtd.suspend = part_suspend;
  87 +                       slave->mtd.resume = part_resume;
  88 +       }
  89 +       if (master->writev)
  90 +               slave->mtd.writev = part_writev;
  91 +       if (master->lock)
  92 +               slave->mtd.lock = part_lock;
  93 +       if (master->unlock)
  94 +               slave->mtd.unlock = part_unlock;
  95 +       if (master->block_isbad)
  96 +               slave->mtd.block_isbad = part_block_isbad;
  97 +       if (master->block_markbad)
  98 +               slave->mtd.block_markbad = part_block_markbad;
  99 +       slave->mtd.erase = part_erase;
 100 +       slave->master = master;
 101 +       slave->offset = part->offset;
 102 +       slave->index = i;
 103 +
 104 +       if (slave->offset == MTDPART_OFS_APPEND)
 105 +               slave->offset = cur_offset;
 106 +       if (slave->offset == MTDPART_OFS_NXTBLK) {
 107 +               slave->offset = cur_offset;
 108 +               if ((cur_offset % master->erasesize) != 0) {
 109 +                       /* Round up to next erasesize */
 110 +                       slave->offset = ((cur_offset / master->erasesize) + 1) * master->erasesize;
 111 +                       printk(KERN_NOTICE "Moving partition %d: "
 112 +                              "0x%08x -> 0x%08x\n", i,
 113 +                              cur_offset, slave->offset);
 114 +               }
 115 +       }
 116 +       if (slave->mtd.size == MTDPART_SIZ_FULL)
 117 +               slave->mtd.size = master->size - slave->offset;
 118 +       cur_offset = slave->offset + slave->mtd.size;
 119 +
 120 +       printk (KERN_NOTICE "0x%08x-0x%08x : \"%s\"\n", slave->offset,
 121 +               slave->offset + slave->mtd.size, slave->mtd.name);
 122 +
 123 +       /* let's do some sanity checks */
 124 +       if (slave->offset >= master->size) {
 125 +                       /* let's register it anyway to preserve ordering */
 126 +               slave->offset = 0;
 127 +               slave->mtd.size = 0;
 128 +               printk ("mtd: partition \"%s\" is out of reach -- disabled\n",
 129 +                       part->name);
 130 +       }
 131 +       if (slave->offset + slave->mtd.size > master->size) {
 132 +               slave->mtd.size = master->size - slave->offset;
 133 +               printk ("mtd: partition \"%s\" extends beyond the end of device \"%s\" -- size truncated to %#x\n",
 134 +                       part->name, master->name, slave->mtd.size);
 135 +       }
 136 +       if (master->numeraseregions>1) {
 137 +               /* Deal with variable erase size stuff */
 138 +               int i;
 139 +               struct mtd_erase_region_info *regions = master->eraseregions;
 140 +
 141 +               /* Find the first erase regions which is part of this partition. */
 142 +               for (i=0; i < master->numeraseregions && slave->offset >= regions[i].offset; i++)
 143 +                       ;
 144 +
 145 +               for (i--; i < master->numeraseregions && slave->offset + slave->mtd.size > regions[i].offset; i++) {
 146 +                       if (slave->mtd.erasesize < regions[i].erasesize) {
 147 +                               slave->mtd.erasesize = regions[i].erasesize;
 148 +                       }
 149 +               }
 150 +       } else {
 151 +               /* Single erase size */
 152 +               slave->mtd.erasesize = master->erasesize;
 153 +       }
 154 +
 155 +       if ((slave->mtd.flags & MTD_WRITEABLE) &&
 156 +           (slave->offset % slave->mtd.erasesize)) {
 157 +               /* Doesn't start on a boundary of major erase size */
 158 +               /* FIXME: Let it be writable if it is on a boundary of _minor_ erase size though */
 159 +               slave->mtd.flags &= ~MTD_WRITEABLE;
 160 +               printk ("mtd: partition \"%s\" doesn't start on an erase block boundary -- force read-only\n",
 161 +                       part->name);
 162 +       }
 163 +       if ((slave->mtd.flags & MTD_WRITEABLE) &&
 164 +           (slave->mtd.size % slave->mtd.erasesize)) {
 165 +               slave->mtd.flags &= ~MTD_WRITEABLE;
 166 +               printk ("mtd: partition \"%s\" doesn't end on an erase block -- force read-only\n",
 167 +                       part->name);
 168 +       }
 169 +
 170 +       slave->mtd.ecclayout = master->ecclayout;
 171 +       if (master->block_isbad) {
 172 +               uint32_t offs = 0;
 173 +
 174 +               while(offs < slave->mtd.size) {
 175 +                       if (master->block_isbad(master,
 176 +                                               offs + slave->offset))
 177 +                               slave->mtd.ecc_stats.badblocks++;
 178 +                       offs += slave->mtd.erasesize;
 179 +               }
 180 +       }
 181 +
 182 +       if(part->mtdp)
 183 +       {       /* store the object pointer (caller may or may not register it */
 184 +               *part->mtdp = &slave->mtd;
 185 +               slave->registered = 0;
 186 +       }
 187 +       else
 188 +       {
 189 +               /* register our partition */
 190 +               add_mtd_device(&slave->mtd);
 191 +               slave->registered = 1;
 192 +       }
 193 +
 194 +       return 0;
 195 +}
 196 +
 197  /*
 198   * This function, given a master MTD object and a partition table, creates
 199   * and registers slave MTD objects which are bound to the master according to
 200 @@ -319,169 +487,53 @@
 201                        const struct mtd_partition *parts,
 202                        int nbparts)
 203  {
 204 -       struct mtd_part *slave;
 205 -       u_int32_t cur_offset = 0;
 206 -       int i;
 207 +       struct mtd_partition *part;
 208 +       int i, ret = 0;
 209
 210         printk (KERN_NOTICE "Creating %d MTD partitions on \"%s\":\n", nbparts, master->name);
 211
 212         for (i = 0; i < nbparts; i++) {
 213 +               part = (struct mtd_partition *) &parts[i];
 214 +               ret = add_mtd_partition(master, part, i);
 215 +               if (ret)
 216 +                       return ret;
 217 +               if (strcmp(part->name, "rootfs") == 0) {
 218 +#ifdef CONFIG_MTD_SPLIT_ROOTFS
 219 +                       int len;
 220 +                       char buf[512];
 221 +                       struct squashfs_super_block *sb = (struct squashfs_super_block *) buf;
 222 +#define ROOTFS_SPLIT_NAME "rootfs_data"
 223 +                       if ((master->read(master, part->offset, sizeof(struct squashfs_super_block), &len, buf) == 0) &&
 224 +                                       (len == sizeof(struct squashfs_super_block)) &&
 225 +                                       (*((u32 *) buf) == SQUASHFS_MAGIC) &&
 226 +                                       (sb->bytes_used > 0)) {
 227 +
 228 +
 229 +                               part = kmalloc(sizeof(struct mtd_partition), GFP_KERNEL);
 230 +                               memcpy(part, &parts[i], sizeof(struct mtd_partition));
 231 +
 232 +                               part->name = kmalloc(sizeof(ROOTFS_SPLIT_NAME) + 1, GFP_KERNEL);
 233 +                               strcpy(part->name, ROOTFS_SPLIT_NAME);
 234 +
 235 +                               len = (u32) sb->bytes_used;
 236 +                               len += (part->offset & 0x000fffff);
 237 +                               len +=  (master->erasesize - 1);
 238 +                               len &= ~(master->erasesize - 1);
 239 +                               len -= (part->offset & 0x000fffff);
 240 +                               part->offset += len;
 241 +                               part->size -= len;
 242 +
 243 +                               if (master->erasesize <= part->size)
 244 +                                       ret = add_mtd_partition(master, part, i + 1);
 245 +                               else
 246 +                                       kfree(part->name);
 247 +                               if (ret)
 248 +                                       return ret;
 249
 250 -               /* allocate the partition structure */
 251 -               slave = kzalloc (sizeof(*slave), GFP_KERNEL);
 252 -               if (!slave) {
 253 -                       printk ("memory allocation error while creating partitions for \"%s\"\n",
 254 -                               master->name);
 255 -                       del_mtd_partitions(master);
 256 -                       return -ENOMEM;
 257 -               }
 258 -               list_add(&slave->list, &mtd_partitions);
 259 -
 260 -               /* set up the MTD object for this partition */
 261 -               slave->mtd.type = master->type;
 262 -               slave->mtd.flags = master->flags & ~parts[i].mask_flags;
 263 -               slave->mtd.size = parts[i].size;
 264 -               slave->mtd.writesize = master->writesize;
 265 -               slave->mtd.oobsize = master->oobsize;
 266 -               slave->mtd.oobavail = master->oobavail;
 267 -               slave->mtd.subpage_sft = master->subpage_sft;
 268 -
 269 -               slave->mtd.name = parts[i].name;
 270 -               slave->mtd.owner = master->owner;
 271 -
 272 -               slave->mtd.read = part_read;
 273 -               slave->mtd.write = part_write;
 274 -
 275 -               if(master->point && master->unpoint){
 276 -                       slave->mtd.point = part_point;
 277 -                       slave->mtd.unpoint = part_unpoint;
 278 -               }
 279 -
 280 -               if (master->read_oob)
 281 -                       slave->mtd.read_oob = part_read_oob;
 282 -               if (master->write_oob)
 283 -                       slave->mtd.write_oob = part_write_oob;
 284 -               if(master->read_user_prot_reg)
 285 -                       slave->mtd.read_user_prot_reg = part_read_user_prot_reg;
 286 -               if(master->read_fact_prot_reg)
 287 -                       slave->mtd.read_fact_prot_reg = part_read_fact_prot_reg;
 288 -               if(master->write_user_prot_reg)
 289 -                       slave->mtd.write_user_prot_reg = part_write_user_prot_reg;
 290 -               if(master->lock_user_prot_reg)
 291 -                       slave->mtd.lock_user_prot_reg = part_lock_user_prot_reg;
 292 -               if(master->get_user_prot_info)
 293 -                       slave->mtd.get_user_prot_info = part_get_user_prot_info;
 294 -               if(master->get_fact_prot_info)
 295 -                       slave->mtd.get_fact_prot_info = part_get_fact_prot_info;
 296 -               if (master->sync)
 297 -                       slave->mtd.sync = part_sync;
 298 -               if (!i && master->suspend && master->resume) {
 299 -                               slave->mtd.suspend = part_suspend;
 300 -                               slave->mtd.resume = part_resume;
 301 -               }
 302 -               if (master->writev)
 303 -                       slave->mtd.writev = part_writev;
 304 -               if (master->lock)
 305 -                       slave->mtd.lock = part_lock;
 306 -               if (master->unlock)
 307 -                       slave->mtd.unlock = part_unlock;
 308 -               if (master->block_isbad)
 309 -                       slave->mtd.block_isbad = part_block_isbad;
 310 -               if (master->block_markbad)
 311 -                       slave->mtd.block_markbad = part_block_markbad;
 312 -               slave->mtd.erase = part_erase;
 313 -               slave->master = master;
 314 -               slave->offset = parts[i].offset;
 315 -               slave->index = i;
 316 -
 317 -               if (slave->offset == MTDPART_OFS_APPEND)
 318 -                       slave->offset = cur_offset;
 319 -               if (slave->offset == MTDPART_OFS_NXTBLK) {
 320 -                       slave->offset = cur_offset;
 321 -                       if ((cur_offset % master->erasesize) != 0) {
 322 -                               /* Round up to next erasesize */
 323 -                               slave->offset = ((cur_offset / master->erasesize) + 1) * master->erasesize;
 324 -                               printk(KERN_NOTICE "Moving partition %d: "
 325 -                                      "0x%08x -> 0x%08x\n", i,
 326 -                                      cur_offset, slave->offset);
 327 +                               kfree(part);
 328                         }
 329 -               }
 330 -               if (slave->mtd.size == MTDPART_SIZ_FULL)
 331 -                       slave->mtd.size = master->size - slave->offset;
 332 -               cur_offset = slave->offset + slave->mtd.size;
 333 -
 334 -               printk (KERN_NOTICE "0x%08x-0x%08x : \"%s\"\n", slave->offset,
 335 -                       slave->offset + slave->mtd.size, slave->mtd.name);
 336 -
 337 -               /* let's do some sanity checks */
 338 -               if (slave->offset >= master->size) {
 339 -                               /* let's register it anyway to preserve ordering */
 340 -                       slave->offset = 0;
 341 -                       slave->mtd.size = 0;
 342 -                       printk ("mtd: partition \"%s\" is out of reach -- disabled\n",
 343 -                               parts[i].name);
 344 -               }
 345 -               if (slave->offset + slave->mtd.size > master->size) {
 346 -                       slave->mtd.size = master->size - slave->offset;
 347 -                       printk ("mtd: partition \"%s\" extends beyond the end of device \"%s\" -- size truncated to %#x\n",
 348 -                               parts[i].name, master->name, slave->mtd.size);
 349 -               }
 350 -               if (master->numeraseregions>1) {
 351 -                       /* Deal with variable erase size stuff */
 352 -                       int i;
 353 -                       struct mtd_erase_region_info *regions = master->eraseregions;
 354 -
 355 -                       /* Find the first erase regions which is part of this partition. */
 356 -                       for (i=0; i < master->numeraseregions && slave->offset >= regions[i].offset; i++)
 357 -                               ;
 358 -
 359 -                       for (i--; i < master->numeraseregions && slave->offset + slave->mtd.size > regions[i].offset; i++) {
 360 -                               if (slave->mtd.erasesize < regions[i].erasesize) {
 361 -                                       slave->mtd.erasesize = regions[i].erasesize;
 362 -                               }
 363 -                       }
 364 -               } else {
 365 -                       /* Single erase size */
 366 -                       slave->mtd.erasesize = master->erasesize;
 367 -               }
 368 -
 369 -               if ((slave->mtd.flags & MTD_WRITEABLE) &&
 370 -                   (slave->offset % slave->mtd.erasesize)) {
 371 -                       /* Doesn't start on a boundary of major erase size */
 372 -                       /* FIXME: Let it be writable if it is on a boundary of _minor_ erase size though */
 373 -                       slave->mtd.flags &= ~MTD_WRITEABLE;
 374 -                       printk ("mtd: partition \"%s\" doesn't start on an erase block boundary -- force read-only\n",
 375 -                               parts[i].name);
 376 -               }
 377 -               if ((slave->mtd.flags & MTD_WRITEABLE) &&
 378 -                   (slave->mtd.size % slave->mtd.erasesize)) {
 379 -                       slave->mtd.flags &= ~MTD_WRITEABLE;
 380 -                       printk ("mtd: partition \"%s\" doesn't end on an erase block -- force read-only\n",
 381 -                               parts[i].name);
 382 -               }
 383 -
 384 -               slave->mtd.ecclayout = master->ecclayout;
 385 -               if (master->block_isbad) {
 386 -                       uint32_t offs = 0;
 387 -
 388 -                       while(offs < slave->mtd.size) {
 389 -                               if (master->block_isbad(master,
 390 -                                                       offs + slave->offset))
 391 -                                       slave->mtd.ecc_stats.badblocks++;
 392 -                               offs += slave->mtd.erasesize;
 393 -                       }
 394 -               }
 395 -
 396 -               if(parts[i].mtdp)
 397 -               {       /* store the object pointer (caller may or may not register it */
 398 -                       *parts[i].mtdp = &slave->mtd;
 399 -                       slave->registered = 0;
 400 -               }
 401 -               else
 402 -               {
 403 -                       /* register our partition */
 404 -                       add_mtd_device(&slave->mtd);
 405 -                       slave->registered = 1;
 406 +#endif /* CONFIG_MTD_SPLIT_ROOTFS */
 407 +                       ROOT_DEV = MKDEV(MTD_BLOCK_MAJOR, i);
 408                 }
 409         }
 410