target/linux/generic/patches-2.6.38/400-rootfs_split.patch

   1 --- a/drivers/mtd/Kconfig
   2 +++ b/drivers/mtd/Kconfig
   3 @@ -55,6 +55,16 @@ config MTD_PARTITIONS
   4
   5  if MTD_PARTITIONS
   6
   7 +config MTD_ROOTFS_ROOT_DEV
   8 +       bool "Automatically set 'rootfs' partition to be root filesystem"
   9 +       depends on MTD_PARTITIONS
  10 +       default y
  11 +
  12 +config MTD_ROOTFS_SPLIT
  13 +       bool "Automatically split 'rootfs' partition for squashfs"
  14 +       depends on MTD_PARTITIONS
  15 +       default y
  16 +
  17  config MTD_REDBOOT_PARTS
  18         tristate "RedBoot partition table parsing"
  19         ---help---
  20 --- a/drivers/mtd/mtdpart.c
  21 +++ b/drivers/mtd/mtdpart.c
  22 @@ -29,6 +29,8 @@
  23  #include <linux/kmod.h>
  24  #include <linux/mtd/mtd.h>
  25  #include <linux/mtd/partitions.h>
  26 +#include <linux/root_dev.h>
  27 +#include <linux/magic.h>
  28  #include <linux/err.h>
  29
  30  /* Our partition linked list */
  31 @@ -48,7 +50,7 @@ struct mtd_part {
  32   * the pointer to that structure with this macro.
  33   */
  34  #define PART(x)  ((struct mtd_part *)(x))
  35 -
  36 +#define IS_PART(mtd) (mtd->read == part_read)
  37
  38  /*
  39   * MTD methods which simply translate the effective address and pass through
  40 @@ -636,6 +638,155 @@ int mtd_del_partition(struct mtd_info *m
  41  }
  42  EXPORT_SYMBOL_GPL(mtd_del_partition);
  43
  44 +#ifdef CONFIG_MTD_ROOTFS_SPLIT
  45 +#define ROOTFS_SPLIT_NAME "rootfs_data"
  46 +#define ROOTFS_REMOVED_NAME "<removed>"
  47 +
  48 +struct squashfs_super_block {
  49 +       __le32 s_magic;
  50 +       __le32 pad0[9];
  51 +       __le64 bytes_used;
  52 +};
  53 +
  54 +
  55 +static int split_squashfs(struct mtd_info *master, int offset, int *split_offset)
  56 +{
  57 +       struct squashfs_super_block sb;
  58 +       int len, ret;
  59 +
  60 +       ret = master->read(master, offset, sizeof(sb), &len, (void *) &sb);
  61 +       if (ret || (len != sizeof(sb))) {
  62 +               printk(KERN_ALERT "split_squashfs: error occured while reading "
  63 +                       "from \"%s\"\n", master->name);
  64 +               return -EINVAL;
  65 +       }
  66 +
  67 +       if (SQUASHFS_MAGIC != le32_to_cpu(sb.s_magic) ) {
  68 +               printk(KERN_ALERT "split_squashfs: no squashfs found in \"%s\"\n",
  69 +                       master->name);
  70 +               *split_offset = 0;
  71 +               return 0;
  72 +       }
  73 +
  74 +       if (le64_to_cpu((sb.bytes_used)) <= 0) {
  75 +               printk(KERN_ALERT "split_squashfs: squashfs is empty in \"%s\"\n",
  76 +                       master->name);
  77 +               *split_offset = 0;
  78 +               return 0;
  79 +       }
  80 +
  81 +       len = (u32) le64_to_cpu(sb.bytes_used);
  82 +       len += (offset & 0x000fffff);
  83 +       len +=  (master->erasesize - 1);
  84 +       len &= ~(master->erasesize - 1);
  85 +       len -= (offset & 0x000fffff);
  86 +       *split_offset = offset + len;
  87 +
  88 +       return 0;
  89 +}
  90 +
  91 +static int split_rootfs_data(struct mtd_info *master, struct mtd_info *rpart, const struct mtd_partition *part)
  92 +{
  93 +       struct mtd_partition *dpart;
  94 +       struct mtd_part *slave = NULL;
  95 +       struct mtd_part *spart;
  96 +       int ret, split_offset = 0;
  97 +
  98 +       spart = PART(rpart);
  99 +       ret = split_squashfs(master, spart->offset, &split_offset);
 100 +       if (ret)
 101 +               return ret;
 102 +
 103 +       if (split_offset <= 0)
 104 +               return 0;
 105 +
 106 +       dpart = kmalloc(sizeof(*part)+sizeof(ROOTFS_SPLIT_NAME)+1, GFP_KERNEL);
 107 +       if (dpart == NULL) {
 108 +               printk(KERN_INFO "split_squashfs: no memory for partition \"%s\"\n",
 109 +                       ROOTFS_SPLIT_NAME);
 110 +               return -ENOMEM;
 111 +       }
 112 +
 113 +       memcpy(dpart, part, sizeof(*part));
 114 +       strcpy((char *)&dpart[1], ROOTFS_SPLIT_NAME);
 115 +       dpart->name = (unsigned char *)&dpart[1];
 116 +
 117 +       dpart->size = rpart->size - (split_offset - spart->offset);
 118 +       dpart->offset = split_offset;
 119 +
 120 +       if (dpart == NULL)
 121 +               return 1;
 122 +
 123 +       printk(KERN_INFO "mtd: partition \"%s\" created automatically, ofs=%llX, len=%llX \n",
 124 +               ROOTFS_SPLIT_NAME, dpart->offset, dpart->size);
 125 +
 126 +       slave = allocate_partition(master, dpart, 0, split_offset);
 127 +       if (IS_ERR(slave))
 128 +               return PTR_ERR(slave);
 129 +       mutex_lock(&mtd_partitions_mutex);
 130 +       list_add(&slave->list, &mtd_partitions);
 131 +       mutex_unlock(&mtd_partitions_mutex);
 132 +
 133 +       add_mtd_device(&slave->mtd);
 134 +
 135 +       rpart->split = &slave->mtd;
 136 +
 137 +       return 0;
 138 +}
 139 +
 140 +static int refresh_rootfs_split(struct mtd_info *mtd)
 141 +{
 142 +       struct mtd_partition tpart;
 143 +       struct mtd_part *part;
 144 +       char *name;
 145 +       //int index = 0;
 146 +       int offset, size;
 147 +       int ret;
 148 +
 149 +       part = PART(mtd);
 150 +
 151 +       /* check for the new squashfs offset first */
 152 +       ret = split_squashfs(part->master, part->offset, &offset);
 153 +       if (ret)
 154 +               return ret;
 155 +
 156 +       if ((offset > 0) && !mtd->split) {
 157 +               printk(KERN_INFO "%s: creating new split partition for \"%s\"\n", __func__, mtd->name);
 158 +               /* if we don't have a rootfs split partition, create a new one */
 159 +               tpart.name = (char *) mtd->name;
 160 +               tpart.size = mtd->size;
 161 +               tpart.offset = part->offset;
 162 +
 163 +               return split_rootfs_data(part->master, &part->mtd, &tpart);
 164 +       } else if ((offset > 0) && mtd->split) {
 165 +               /* update the offsets of the existing partition */
 166 +               size = mtd->size + part->offset - offset;
 167 +
 168 +               part = PART(mtd->split);
 169 +               part->offset = offset;
 170 +               part->mtd.size = size;
 171 +               printk(KERN_INFO "%s: %s partition \"" ROOTFS_SPLIT_NAME "\", offset: 0x%06x (0x%06x)\n",
 172 +                       __func__, (!strcmp(part->mtd.name, ROOTFS_SPLIT_NAME) ? "updating" : "creating"),
 173 +                       (u32) part->offset, (u32) part->mtd.size);
 174 +               name = kmalloc(sizeof(ROOTFS_SPLIT_NAME) + 1, GFP_KERNEL);
 175 +               strcpy(name, ROOTFS_SPLIT_NAME);
 176 +               part->mtd.name = name;
 177 +       } else if ((offset <= 0) && mtd->split) {
 178 +               printk(KERN_INFO "%s: removing partition \"%s\"\n", __func__, mtd->split->name);
 179 +
 180 +               /* mark existing partition as removed */
 181 +               part = PART(mtd->split);
 182 +               name = kmalloc(sizeof(ROOTFS_SPLIT_NAME) + 1, GFP_KERNEL);
 183 +               strcpy(name, ROOTFS_REMOVED_NAME);
 184 +               part->mtd.name = name;
 185 +               part->offset = 0;
 186 +               part->mtd.size = 0;
 187 +       }
 188 +
 189 +       return 0;
 190 +}
 191 +#endif /* CONFIG_MTD_ROOTFS_SPLIT */
 192 +
 193  /*
 194   * This function, given a master MTD object and a partition table, creates
 195   * and registers slave MTD objects which are bound to the master according to
 196 @@ -652,6 +803,9 @@ int add_mtd_partitions(struct mtd_info *
 197         struct mtd_part *slave;
 198         uint64_t cur_offset = 0;
 199         int i;
 200 +#ifdef CONFIG_MTD_ROOTFS_SPLIT
 201 +       int ret;
 202 +#endif
 203
 204         printk(KERN_NOTICE "Creating %d MTD partitions on \"%s\":\n", nbparts, master->name);
 205
 206 @@ -666,6 +820,21 @@ int add_mtd_partitions(struct mtd_info *
 207
 208                 add_mtd_device(&slave->mtd);
 209
 210 +               if (!strcmp(parts[i].name, "rootfs")) {
 211 +#ifdef CONFIG_MTD_ROOTFS_ROOT_DEV
 212 +                       if (ROOT_DEV == 0) {
 213 +                               printk(KERN_NOTICE "mtd: partition \"rootfs\" "
 214 +                                       "set to be root filesystem\n");
 215 +                               ROOT_DEV = MKDEV(MTD_BLOCK_MAJOR, slave->mtd.index);
 216 +                       }
 217 +#endif
 218 +#ifdef CONFIG_MTD_ROOTFS_SPLIT
 219 +                       ret = split_rootfs_data(master, &slave->mtd, &parts[i]);
 220 +                       /* if (ret == 0)
 221 +                        *      j++; */
 222 +#endif
 223 +               }
 224 +
 225                 cur_offset = slave->offset + slave->mtd.size;
 226         }
 227
 228 @@ -673,6 +842,32 @@ int add_mtd_partitions(struct mtd_info *
 229  }
 230  EXPORT_SYMBOL(add_mtd_partitions);
 231
 232 +int refresh_mtd_partitions(struct mtd_info *mtd)
 233 +{
 234 +       int ret = 0;
 235 +
 236 +       if (IS_PART(mtd)) {
 237 +               struct mtd_part *part;
 238 +               struct mtd_info *master;
 239 +
 240 +               part = PART(mtd);
 241 +               master = part->master;
 242 +               if (master->refresh_device)
 243 +                       ret = master->refresh_device(master);
 244 +       }
 245 +
 246 +       if (!ret && mtd->refresh_device)
 247 +               ret = mtd->refresh_device(mtd);
 248 +
 249 +#ifdef CONFIG_MTD_ROOTFS_SPLIT
 250 +       if (!ret && IS_PART(mtd) && !strcmp(mtd->name, "rootfs"))
 251 +               refresh_rootfs_split(mtd);
 252 +#endif
 253 +
 254 +       return 0;
 255 +}
 256 +EXPORT_SYMBOL_GPL(refresh_mtd_partitions);
 257 +
 258  static DEFINE_SPINLOCK(part_parser_lock);
 259  static LIST_HEAD(part_parsers);
 260
 261 --- a/drivers/mtd/mtdchar.c
 262 +++ b/drivers/mtd/mtdchar.c
 263 @@ -956,6 +956,13 @@ static int mtd_ioctl(struct file *file,
 264                 break;
 265         }
 266  #endif
 267 +#ifdef CONFIG_MTD_PARTITIONS
 268 +       case MTDREFRESH:
 269 +       {
 270 +               ret = refresh_mtd_partitions(mtd);
 271 +               break;
 272 +       }
 273 +#endif
 274
 275         default:
 276                 ret = -ENOTTY;
 277 --- a/include/linux/mtd/mtd.h
 278 +++ b/include/linux/mtd/mtd.h
 279 @@ -125,6 +125,7 @@ struct nand_ecclayout {
 280         struct nand_oobfree oobfree[MTD_MAX_OOBFREE_ENTRIES_LARGE];
 281  };
 282
 283 +struct mtd_info;
 284  struct mtd_info {
 285         u_char type;
 286         uint32_t flags;
 287 @@ -277,6 +278,9 @@ struct mtd_info {
 288         struct device dev;
 289         int usecount;
 290
 291 +       int (*refresh_device)(struct mtd_info *mtd);
 292 +       struct mtd_info *split;
 293 +
 294         /* If the driver is something smart, like UBI, it may need to maintain
 295          * its own reference counting. The below functions are only for driver.
 296          * The driver may register its callbacks. These callbacks are not
 297 --- a/include/linux/mtd/partitions.h
 298 +++ b/include/linux/mtd/partitions.h
 299 @@ -34,12 +34,14 @@
 300   * erasesize aligned (e.g. use MTDPART_OFS_NEXTBLK).
 301   */
 302
 303 +struct mtd_partition;
 304  struct mtd_partition {
 305 -       char *name;                     /* identifier string */
 306 +       const char *name;               /* identifier string */
 307         uint64_t size;                  /* partition size */
 308         uint64_t offset;                /* offset within the master MTD space */
 309         uint32_t mask_flags;            /* master MTD flags to mask out for this partition */
 310         struct nand_ecclayout *ecclayout;       /* out of band layout for this partition (NAND only) */
 311 +       int (*refresh_partition)(struct mtd_info *);
 312  };
 313
 314  #define MTDPART_OFS_NXTBLK     (-2)
 315 @@ -51,6 +53,7 @@ struct mtd_info;
 316
 317  int add_mtd_partitions(struct mtd_info *, const struct mtd_partition *, int);
 318  int del_mtd_partitions(struct mtd_info *);
 319 +int refresh_mtd_partitions(struct mtd_info *);
 320
 321  /*
 322   * Functions dealing with the various ways of partitioning the space
 323 --- a/include/mtd/mtd-abi.h
 324 +++ b/include/mtd/mtd-abi.h
 325 @@ -127,6 +127,7 @@ struct otp_info {
 326  #define MEMWRITEOOB64          _IOWR('M', 21, struct mtd_oob_buf64)
 327  #define MEMREADOOB64           _IOWR('M', 22, struct mtd_oob_buf64)
 328  #define MEMISLOCKED            _IOR('M', 23, struct erase_info_user)
 329 +#define MTDREFRESH             _IO('M', 50)
 330
 331  /*
 332   * Obsolete legacy interface. Keep it in order not to break userspace