target/linux/generic/patches-2.6.37/400-rootfs_split.patch

   1 --- a/drivers/mtd/Kconfig
   2 +++ b/drivers/mtd/Kconfig
   3 @@ -53,6 +53,16 @@ config MTD_PARTITIONS
   4           devices. Partitioning on NFTL 'devices' is a different - that's the
   5           'normal' form of partitioning used on a block device.
   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         depends on MTD_PARTITIONS
  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 @@ -618,6 +620,155 @@ 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 @@ -633,7 +784,7 @@ int add_mtd_partitions(struct mtd_info *
 197  {
 198         struct mtd_part *slave;
 199         uint64_t cur_offset = 0;
 200 -       int i;
 201 +       int i, ret;
 202
 203         printk(KERN_NOTICE "Creating %d MTD partitions on \"%s\":\n", nbparts, master->name);
 204
 205 @@ -648,6 +799,21 @@ int add_mtd_partitions(struct mtd_info *
 206
 207                 add_mtd_device(&slave->mtd);
 208
 209 +               if (!strcmp(parts[i].name, "rootfs")) {
 210 +#ifdef CONFIG_MTD_ROOTFS_ROOT_DEV
 211 +                       if (ROOT_DEV == 0) {
 212 +                               printk(KERN_NOTICE "mtd: partition \"rootfs\" "
 213 +                                       "set to be root filesystem\n");
 214 +                               ROOT_DEV = MKDEV(MTD_BLOCK_MAJOR, slave->mtd.index);
 215 +                       }
 216 +#endif
 217 +#ifdef CONFIG_MTD_ROOTFS_SPLIT
 218 +                       ret = split_rootfs_data(master, &slave->mtd, &parts[i]);
 219 +                       /* if (ret == 0)
 220 +                        *      j++; */
 221 +#endif
 222 +               }
 223 +
 224                 cur_offset = slave->offset + slave->mtd.size;
 225         }
 226
 227 @@ -655,6 +821,32 @@ int add_mtd_partitions(struct mtd_info *
 228  }
 229  EXPORT_SYMBOL(add_mtd_partitions);
 230
 231 +int refresh_mtd_partitions(struct mtd_info *mtd)
 232 +{
 233 +       int ret = 0;
 234 +
 235 +       if (IS_PART(mtd)) {
 236 +               struct mtd_part *part;
 237 +               struct mtd_info *master;
 238 +
 239 +               part = PART(mtd);
 240 +               master = part->master;
 241 +               if (master->refresh_device)
 242 +                       ret = master->refresh_device(master);
 243 +       }
 244 +
 245 +       if (!ret && mtd->refresh_device)
 246 +               ret = mtd->refresh_device(mtd);
 247 +
 248 +#ifdef CONFIG_MTD_ROOTFS_SPLIT
 249 +       if (!ret && IS_PART(mtd) && !strcmp(mtd->name, "rootfs"))
 250 +               refresh_rootfs_split(mtd);
 251 +#endif
 252 +
 253 +       return 0;
 254 +}
 255 +EXPORT_SYMBOL_GPL(refresh_mtd_partitions);
 256 +
 257  static DEFINE_SPINLOCK(part_parser_lock);
 258  static LIST_HEAD(part_parsers);
 259
 260 --- a/drivers/mtd/mtdchar.c
 261 +++ b/drivers/mtd/mtdchar.c
 262 @@ -956,6 +956,13 @@ static int mtd_ioctl(struct file *file,
 263                 break;
 264         }
 265  #endif
 266 +#ifdef CONFIG_MTD_PARTITIONS
 267 +       case MTDREFRESH:
 268 +       {
 269 +               ret = refresh_mtd_partitions(mtd);
 270 +               break;
 271 +       }
 272 +#endif
 273
 274         default:
 275                 ret = -ENOTTY;
 276 --- a/include/linux/mtd/mtd.h
 277 +++ b/include/linux/mtd/mtd.h
 278 @@ -125,6 +125,7 @@ struct nand_ecclayout {
 279         struct nand_oobfree oobfree[MTD_MAX_OOBFREE_ENTRIES_LARGE];
 280  };
 281
 282 +struct mtd_info;
 283  struct mtd_info {
 284         u_char type;
 285         uint32_t flags;
 286 @@ -266,6 +267,9 @@ struct mtd_info {
 287         struct device dev;
 288         int usecount;
 289
 290 +       int (*refresh_device)(struct mtd_info *mtd);
 291 +       struct mtd_info *split;
 292 +
 293         /* If the driver is something smart, like UBI, it may need to maintain
 294          * its own reference counting. The below functions are only for driver.
 295          * The driver may register its callbacks. These callbacks are not
 296 --- a/include/linux/mtd/partitions.h
 297 +++ b/include/linux/mtd/partitions.h
 298 @@ -34,12 +34,14 @@
 299   * erasesize aligned (e.g. use MTDPART_OFS_NEXTBLK).
 300   */
 301
 302 +struct mtd_partition;
 303  struct mtd_partition {
 304 -       char *name;                     /* identifier string */
 305 +       const char *name;               /* identifier string */
 306         uint64_t size;                  /* partition size */
 307         uint64_t offset;                /* offset within the master MTD space */
 308         uint32_t mask_flags;            /* master MTD flags to mask out for this partition */
 309         struct nand_ecclayout *ecclayout;       /* out of band layout for this partition (NAND only) */
 310 +       int (*refresh_partition)(struct mtd_info *);
 311  };
 312
 313  #define MTDPART_OFS_NXTBLK     (-2)
 314 @@ -51,6 +53,7 @@ struct mtd_info;
 315
 316  int add_mtd_partitions(struct mtd_info *, const struct mtd_partition *, int);
 317  int del_mtd_partitions(struct mtd_info *);
 318 +int refresh_mtd_partitions(struct mtd_info *);
 319
 320  /*
 321   * Functions dealing with the various ways of partitioning the space
 322 --- a/include/mtd/mtd-abi.h
 323 +++ b/include/mtd/mtd-abi.h
 324 @@ -127,6 +127,7 @@ struct otp_info {
 325  #define MEMWRITEOOB64          _IOWR('M', 21, struct mtd_oob_buf64)
 326  #define MEMREADOOB64           _IOWR('M', 22, struct mtd_oob_buf64)
 327  #define MEMISLOCKED            _IOR('M', 23, struct erase_info_user)
 328 +#define MTDREFRESH             _IO('M', 50)
 329
 330  /*
 331   * Obsolete legacy interface. Keep it in order not to break userspace