in inftlmount.c [31:300]
static int find_boot_record(struct INFTLrecord *inftl)
{
struct inftl_unittail h1;
//struct inftl_oob oob;
unsigned int i, block;
u8 buf[SECTORSIZE];
struct INFTLMediaHeader *mh = &inftl->MediaHdr;
struct mtd_info *mtd = inftl->mbd.mtd;
struct INFTLPartition *ip;
size_t retlen;
pr_debug("INFTL: find_boot_record(inftl=%p)\n", inftl);
/*
* Assume logical EraseSize == physical erasesize for starting the
* scan. We'll sort it out later if we find a MediaHeader which says
* otherwise.
*/
inftl->EraseSize = inftl->mbd.mtd->erasesize;
inftl->nb_blocks = (u32)inftl->mbd.mtd->size / inftl->EraseSize;
inftl->MediaUnit = BLOCK_NIL;
/* Search for a valid boot record */
for (block = 0; block < inftl->nb_blocks; block++) {
int ret;
/*
* Check for BNAND header first. Then whinge if it's found
* but later checks fail.
*/
ret = mtd_read(mtd, block * inftl->EraseSize, SECTORSIZE,
&retlen, buf);
/* We ignore ret in case the ECC of the MediaHeader is invalid
(which is apparently acceptable) */
if (retlen != SECTORSIZE) {
static int warncount = 5;
if (warncount) {
printk(KERN_WARNING "INFTL: block read at 0x%x "
"of mtd%d failed: %d\n",
block * inftl->EraseSize,
inftl->mbd.mtd->index, ret);
if (!--warncount)
printk(KERN_WARNING "INFTL: further "
"failures for this block will "
"not be printed\n");
}
continue;
}
if (retlen < 6 || memcmp(buf, "BNAND", 6)) {
/* BNAND\0 not found. Continue */
continue;
}
/* To be safer with BIOS, also use erase mark as discriminant */
ret = inftl_read_oob(mtd,
block * inftl->EraseSize + SECTORSIZE + 8,
8, &retlen,(char *)&h1);
if (ret < 0) {
printk(KERN_WARNING "INFTL: ANAND header found at "
"0x%x in mtd%d, but OOB data read failed "
"(err %d)\n", block * inftl->EraseSize,
inftl->mbd.mtd->index, ret);
continue;
}
/*
* This is the first we've seen.
* Copy the media header structure into place.
*/
memcpy(mh, buf, sizeof(struct INFTLMediaHeader));
/* Read the spare media header at offset 4096 */
mtd_read(mtd, block * inftl->EraseSize + 4096, SECTORSIZE,
&retlen, buf);
if (retlen != SECTORSIZE) {
printk(KERN_WARNING "INFTL: Unable to read spare "
"Media Header\n");
return -1;
}
/* Check if this one is the same as the first one we found. */
if (memcmp(mh, buf, sizeof(struct INFTLMediaHeader))) {
printk(KERN_WARNING "INFTL: Primary and spare Media "
"Headers disagree.\n");
return -1;
}
mh->NoOfBootImageBlocks = le32_to_cpu(mh->NoOfBootImageBlocks);
mh->NoOfBinaryPartitions = le32_to_cpu(mh->NoOfBinaryPartitions);
mh->NoOfBDTLPartitions = le32_to_cpu(mh->NoOfBDTLPartitions);
mh->BlockMultiplierBits = le32_to_cpu(mh->BlockMultiplierBits);
mh->FormatFlags = le32_to_cpu(mh->FormatFlags);
mh->PercentUsed = le32_to_cpu(mh->PercentUsed);
pr_debug("INFTL: Media Header ->\n"
" bootRecordID = %s\n"
" NoOfBootImageBlocks = %d\n"
" NoOfBinaryPartitions = %d\n"
" NoOfBDTLPartitions = %d\n"
" BlockMultiplierBits = %d\n"
" FormatFlgs = %d\n"
" OsakVersion = 0x%x\n"
" PercentUsed = %d\n",
mh->bootRecordID, mh->NoOfBootImageBlocks,
mh->NoOfBinaryPartitions,
mh->NoOfBDTLPartitions,
mh->BlockMultiplierBits, mh->FormatFlags,
mh->OsakVersion, mh->PercentUsed);
if (mh->NoOfBDTLPartitions == 0) {
printk(KERN_WARNING "INFTL: Media Header sanity check "
"failed: NoOfBDTLPartitions (%d) == 0, "
"must be at least 1\n", mh->NoOfBDTLPartitions);
return -1;
}
if ((mh->NoOfBDTLPartitions + mh->NoOfBinaryPartitions) > 4) {
printk(KERN_WARNING "INFTL: Media Header sanity check "
"failed: Total Partitions (%d) > 4, "
"BDTL=%d Binary=%d\n", mh->NoOfBDTLPartitions +
mh->NoOfBinaryPartitions,
mh->NoOfBDTLPartitions,
mh->NoOfBinaryPartitions);
return -1;
}
if (mh->BlockMultiplierBits > 1) {
printk(KERN_WARNING "INFTL: sorry, we don't support "
"UnitSizeFactor 0x%02x\n",
mh->BlockMultiplierBits);
return -1;
} else if (mh->BlockMultiplierBits == 1) {
printk(KERN_WARNING "INFTL: support for INFTL with "
"UnitSizeFactor 0x%02x is experimental\n",
mh->BlockMultiplierBits);
inftl->EraseSize = inftl->mbd.mtd->erasesize <<
mh->BlockMultiplierBits;
inftl->nb_blocks = (u32)inftl->mbd.mtd->size / inftl->EraseSize;
block >>= mh->BlockMultiplierBits;
}
/* Scan the partitions */
for (i = 0; (i < 4); i++) {
ip = &mh->Partitions[i];
ip->virtualUnits = le32_to_cpu(ip->virtualUnits);
ip->firstUnit = le32_to_cpu(ip->firstUnit);
ip->lastUnit = le32_to_cpu(ip->lastUnit);
ip->flags = le32_to_cpu(ip->flags);
ip->spareUnits = le32_to_cpu(ip->spareUnits);
ip->Reserved0 = le32_to_cpu(ip->Reserved0);
pr_debug(" PARTITION[%d] ->\n"
" virtualUnits = %d\n"
" firstUnit = %d\n"
" lastUnit = %d\n"
" flags = 0x%x\n"
" spareUnits = %d\n",
i, ip->virtualUnits, ip->firstUnit,
ip->lastUnit, ip->flags,
ip->spareUnits);
if (ip->Reserved0 != ip->firstUnit) {
struct erase_info *instr = &inftl->instr;
/*
* Most likely this is using the
* undocumented qiuck mount feature.
* We don't support that, we will need
* to erase the hidden block for full
* compatibility.
*/
instr->addr = ip->Reserved0 * inftl->EraseSize;
instr->len = inftl->EraseSize;
mtd_erase(mtd, instr);
}
if ((ip->lastUnit - ip->firstUnit + 1) < ip->virtualUnits) {
printk(KERN_WARNING "INFTL: Media Header "
"Partition %d sanity check failed\n"
" firstUnit %d : lastUnit %d > "
"virtualUnits %d\n", i, ip->lastUnit,
ip->firstUnit, ip->Reserved0);
return -1;
}
if (ip->Reserved1 != 0) {
printk(KERN_WARNING "INFTL: Media Header "
"Partition %d sanity check failed: "
"Reserved1 %d != 0\n",
i, ip->Reserved1);
return -1;
}
if (ip->flags & INFTL_BDTL)
break;
}
if (i >= 4) {
printk(KERN_WARNING "INFTL: Media Header Partition "
"sanity check failed:\n No partition "
"marked as Disk Partition\n");
return -1;
}
inftl->nb_boot_blocks = ip->firstUnit;
inftl->numvunits = ip->virtualUnits;
if (inftl->numvunits > (inftl->nb_blocks -
inftl->nb_boot_blocks - 2)) {
printk(KERN_WARNING "INFTL: Media Header sanity check "
"failed:\n numvunits (%d) > nb_blocks "
"(%d) - nb_boot_blocks(%d) - 2\n",
inftl->numvunits, inftl->nb_blocks,
inftl->nb_boot_blocks);
return -1;
}
inftl->mbd.size = inftl->numvunits *
(inftl->EraseSize / SECTORSIZE);
/*
* Block count is set to last used EUN (we won't need to keep
* any meta-data past that point).
*/
inftl->firstEUN = ip->firstUnit;
inftl->lastEUN = ip->lastUnit;
inftl->nb_blocks = ip->lastUnit + 1;
/* Memory alloc */
inftl->PUtable = kmalloc_array(inftl->nb_blocks, sizeof(u16),
GFP_KERNEL);
if (!inftl->PUtable)
return -ENOMEM;
inftl->VUtable = kmalloc_array(inftl->nb_blocks, sizeof(u16),
GFP_KERNEL);
if (!inftl->VUtable) {
kfree(inftl->PUtable);
return -ENOMEM;
}
/* Mark the blocks before INFTL MediaHeader as reserved */
for (i = 0; i < inftl->nb_boot_blocks; i++)
inftl->PUtable[i] = BLOCK_RESERVED;
/* Mark all remaining blocks as potentially containing data */
for (; i < inftl->nb_blocks; i++)
inftl->PUtable[i] = BLOCK_NOTEXPLORED;
/* Mark this boot record (NFTL MediaHeader) block as reserved */
inftl->PUtable[block] = BLOCK_RESERVED;
/* Read Bad Erase Unit Table and modify PUtable[] accordingly */
for (i = 0; i < inftl->nb_blocks; i++) {
int physblock;
/* If any of the physical eraseblocks are bad, don't
use the unit. */
for (physblock = 0; physblock < inftl->EraseSize; physblock += inftl->mbd.mtd->erasesize) {
if (mtd_block_isbad(inftl->mbd.mtd,
i * inftl->EraseSize + physblock))
inftl->PUtable[i] = BLOCK_RESERVED;
}
}
inftl->MediaUnit = block;
return 0;
}
/* Not found. */
return -1;
}