diff options
Diffstat (limited to 'drivers/mtd/inftlmount.c')
| -rw-r--r-- | drivers/mtd/inftlmount.c | 804 |
1 files changed, 804 insertions, 0 deletions
diff --git a/drivers/mtd/inftlmount.c b/drivers/mtd/inftlmount.c new file mode 100644 index 00000000000..b5dda47395a --- /dev/null +++ b/drivers/mtd/inftlmount.c @@ -0,0 +1,804 @@ +/* + * inftlmount.c -- INFTL mount code with extensive checks. + * + * Author: Greg Ungerer (gerg@snapgear.com) + * (C) Copyright 2002-2003, Greg Ungerer (gerg@snapgear.com) + * + * Based heavily on the nftlmount.c code which is: + * Author: Fabrice Bellard (fabrice.bellard@netgem.com) + * Copyright (C) 2000 Netgem S.A. + * + * $Id: inftlmount.c,v 1.16 2004/11/22 13:50:53 kalev Exp $ + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <asm/errno.h> +#include <asm/io.h> +#include <asm/uaccess.h> +#include <linux/miscdevice.h> +#include <linux/pci.h> +#include <linux/delay.h> +#include <linux/slab.h> +#include <linux/sched.h> +#include <linux/init.h> +#include <linux/mtd/mtd.h> +#include <linux/mtd/nftl.h> +#include <linux/mtd/inftl.h> +#include <linux/mtd/compatmac.h> + +char inftlmountrev[]="$Revision: 1.16 $"; + +/* + * find_boot_record: Find the INFTL Media Header and its Spare copy which + * contains the various device information of the INFTL partition and + * Bad Unit Table. Update the PUtable[] table according to the Bad + * Unit Table. PUtable[] is used for management of Erase Unit in + * other routines in inftlcore.c and inftlmount.c. + */ +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 INFTLPartition *ip; + size_t retlen; + + DEBUG(MTD_DEBUG_LEVEL3, "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 = 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(inftl->mbd.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 */ + if ((ret = MTD_READOOB(inftl->mbd.mtd, block * inftl->EraseSize + + SECTORSIZE + 8, 8, &retlen, (char *)&h1) < 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(inftl->mbd.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); + +#ifdef CONFIG_MTD_DEBUG_VERBOSE + if (CONFIG_MTD_DEBUG_VERBOSE >= 2) { + printk("INFTL: Media Header ->\n" + " bootRecordID = %s\n" + " NoOfBootImageBlocks = %d\n" + " NoOfBinaryPartitions = %d\n" + " NoOfBDTLPartitions = %d\n" + " BlockMultiplerBits = %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); + } +#endif + + 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 = 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); + +#ifdef CONFIG_MTD_DEBUG_VERBOSE + if (CONFIG_MTD_DEBUG_VERBOSE >= 2) { + printk(" 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); + } +#endif + + if (ip->Reserved0 != ip->firstUnit) { + struct erase_info *instr = &inftl->instr; + + instr->mtd = inftl->mbd.mtd; + + /* + * 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(inftl->mbd.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(inftl->nb_blocks * sizeof(u16), GFP_KERNEL); + if (!inftl->PUtable) { + printk(KERN_WARNING "INFTL: allocation of PUtable " + "failed (%zd bytes)\n", + inftl->nb_blocks * sizeof(u16)); + return -ENOMEM; + } + + inftl->VUtable = kmalloc(inftl->nb_blocks * sizeof(u16), GFP_KERNEL); + if (!inftl->VUtable) { + kfree(inftl->PUtable); + printk(KERN_WARNING "INFTL: allocation of VUtable " + "failed (%zd bytes)\n", + inftl->nb_blocks * sizeof(u16)); + 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 (inftl->mbd.mtd->block_isbad(inftl->mbd.mtd, i * inftl->EraseSize + physblock)) + inftl->PUtable[i] = BLOCK_RESERVED; + } + } + + inftl->MediaUnit = block; + return 0; + } + + /* Not found. */ + return -1; +} + +static int memcmpb(void *a, int c, int n) +{ + int i; + for (i = 0; i < n; i++) { + if (c != ((unsigned char *)a)[i]) + return 1; + } + return 0; +} + +/* + * check_free_sector: check if a free sector is actually FREE, + * i.e. All 0xff in data and oob area. + */ +static int check_free_sectors(struct INFTLrecord *inftl, unsigned int address, + int len, int check_oob) +{ + u8 buf[SECTORSIZE + inftl->mbd.mtd->oobsize]; + size_t retlen; + int i; + + DEBUG(MTD_DEBUG_LEVEL3, "INFTL: check_free_sectors(inftl=%p," + "address=0x%x,len=%d,check_oob=%d)\n", inftl, + address, len, check_oob); + + for (i = 0; i < len; i += SECTORSIZE) { + if (MTD_READECC(inftl->mbd.mtd, address, SECTORSIZE, &retlen, buf, &buf[SECTORSIZE], &inftl->oobinfo) < 0) + return -1; + if (memcmpb(buf, 0xff, SECTORSIZE) != 0) + return -1; + + if (check_oob) { + if (memcmpb(buf + SECTORSIZE, 0xff, inftl->mbd.mtd->oobsize) != 0) + return -1; + } + address += SECTORSIZE; + } + + return 0; +} + +/* + * INFTL_format: format a Erase Unit by erasing ALL Erase Zones in the Erase + * Unit and Update INFTL metadata. Each erase operation is + * checked with check_free_sectors. + * + * Return: 0 when succeed, -1 on error. + * + * ToDo: 1. Is it neceressary to check_free_sector after erasing ?? + */ +int INFTL_formatblock(struct INFTLrecord *inftl, int block) +{ + size_t retlen; + struct inftl_unittail uci; + struct erase_info *instr = &inftl->instr; + int physblock; + + DEBUG(MTD_DEBUG_LEVEL3, "INFTL: INFTL_formatblock(inftl=%p," + "block=%d)\n", inftl, block); + + memset(instr, 0, sizeof(struct erase_info)); + + /* FIXME: Shouldn't we be setting the 'discarded' flag to zero + _first_? */ + + /* Use async erase interface, test return code */ + instr->mtd = inftl->mbd.mtd; + instr->addr = block * inftl->EraseSize; + instr->len = inftl->mbd.mtd->erasesize; + /* Erase one physical eraseblock at a time, even though the NAND api + allows us to group them. This way we if we have a failure, we can + mark only the failed block in the bbt. */ + for (physblock = 0; physblock < inftl->EraseSize; physblock += instr->len, instr->addr += instr->len) { + MTD_ERASE(inftl->mbd.mtd, instr); + + if (instr->state == MTD_ERASE_FAILED) { + printk(KERN_WARNING "INFTL: error while formatting block %d\n", + block); + goto fail; + } + + /* + * Check the "freeness" of Erase Unit before updating metadata. + * FixMe: is this check really necessary? Since we have check the + * return code after the erase operation. + */ + if (check_free_sectors(inftl, instr->addr, instr->len, 1) != 0) + goto fail; + } + + uci.EraseMark = cpu_to_le16(ERASE_MARK); + uci.EraseMark1 = cpu_to_le16(ERASE_MARK); + uci.Reserved[0] = 0; + uci.Reserved[1] = 0; + uci.Reserved[2] = 0; + uci.Reserved[3] = 0; + instr->addr = block * inftl->EraseSize + SECTORSIZE * 2; + if (MTD_WRITEOOB(inftl->mbd.mtd, instr->addr + + 8, 8, &retlen, (char *)&uci) < 0) + goto fail; + return 0; +fail: + /* could not format, update the bad block table (caller is responsible + for setting the PUtable to BLOCK_RESERVED on failure) */ + inftl->mbd.mtd->block_markbad(inftl->mbd.mtd, instr->addr); + return -1; +} + +/* + * format_chain: Format an invalid Virtual Unit chain. It frees all the Erase + * Units in a Virtual Unit Chain, i.e. all the units are disconnected. + * + * Since the chain is invalid then we will have to erase it from its + * head (normally for INFTL we go from the oldest). But if it has a + * loop then there is no oldest... + */ +static void format_chain(struct INFTLrecord *inftl, unsigned int first_block) +{ + unsigned int block = first_block, block1; + + printk(KERN_WARNING "INFTL: formatting chain at block %d\n", + first_block); + + for (;;) { + block1 = inftl->PUtable[block]; + + printk(KERN_WARNING "INFTL: formatting block %d\n", block); + if (INFTL_formatblock(inftl, block) < 0) { + /* + * Cannot format !!!! Mark it as Bad Unit, + */ + inftl->PUtable[block] = BLOCK_RESERVED; + } else { + inftl->PUtable[block] = BLOCK_FREE; + } + + /* Goto next block on the chain */ + block = block1; + + if (block == BLOCK_NIL || block >= inftl->lastEUN) + break; + } +} + +void INFTL_dumptables(struct INFTLrecord *s) +{ + int i; + + printk("-------------------------------------------" + "----------------------------------\n"); + + printk("VUtable[%d] ->", s->nb_blocks); + for (i = 0; i < s->nb_blocks; i++) { + if ((i % 8) == 0) + printk("\n%04x: ", i); + printk("%04x ", s->VUtable[i]); + } + + printk("\n-------------------------------------------" + "----------------------------------\n"); + + printk("PUtable[%d-%d=%d] ->", s->firstEUN, s->lastEUN, s->nb_blocks); + for (i = 0; i <= s->lastEUN; i++) { + if ((i % 8) == 0) + printk("\n%04x: ", i); + printk("%04x ", s->PUtable[i]); + } + + printk("\n-------------------------------------------" + "----------------------------------\n"); + + printk("INFTL ->\n" + " EraseSize = %d\n" + " h/s/c = %d/%d/%d\n" + " numvunits = %d\n" + " firstEUN = %d\n" + " lastEUN = %d\n" + " numfreeEUNs = %d\n" + " LastFreeEUN = %d\n" + " nb_blocks = %d\n" + " nb_boot_blocks = %d", + s->EraseSize, s->heads, s->sectors, s->cylinders, + s->numvunits, s->firstEUN, s->lastEUN, s->numfreeEUNs, + s->LastFreeEUN, s->nb_blocks, s->nb_boot_blocks); + + printk("\n-------------------------------------------" + "----------------------------------\n"); +} + +void INFTL_dumpVUchains(struct INFTLrecord *s) +{ + int logical, block, i; + + printk("-------------------------------------------" + "----------------------------------\n"); + + printk("INFTL Virtual Unit Chains:\n"); + for (logical = 0; logical < s->nb_blocks; logical++) { + block = s->VUtable[logical]; + if (block > s->nb_blocks) + continue; + printk(" LOGICAL %d --> %d ", logical, block); + for (i = 0; i < s->nb_blocks; i++) { + if (s->PUtable[block] == BLOCK_NIL) + break; + block = s->PUtable[block]; + printk("%d ", block); + } + printk("\n"); + } + + printk("-------------------------------------------" + "----------------------------------\n"); +} + +int INFTL_mount(struct INFTLrecord *s) +{ + unsigned int block, first_block, prev_block, last_block; + unsigned int first_logical_block, logical_block, erase_mark; + int chain_length, do_format_chain; + struct inftl_unithead1 h0; + struct inftl_unittail h1; + size_t retlen; + int i; + u8 *ANACtable, ANAC; + + DEBUG(MTD_DEBUG_LEVEL3, "INFTL: INFTL_mount(inftl=%p)\n", s); + + /* Search for INFTL MediaHeader and Spare INFTL Media Header */ + if (find_boot_record(s) < 0) { + printk(KERN_WARNING "INFTL: could not find valid boot record?\n"); + return -1; + } + + /* Init the logical to physical table */ + for (i = 0; i < s->nb_blocks; i++) + s->VUtable[i] = BLOCK_NIL; + + logical_block = block = BLOCK_NIL; + + /* Temporary buffer to store ANAC numbers. */ + ANACtable = kmalloc(s->nb_blocks * sizeof(u8), GFP_KERNEL); + memset(ANACtable, 0, s->nb_blocks); + + /* + * First pass is to explore each physical unit, and construct the + * virtual chains that exist (newest physical unit goes into VUtable). + * Any block that is in any way invalid will be left in the + * NOTEXPLORED state. Then at the end we will try to format it and + * mark it as free. + */ + DEBUG(MTD_DEBUG_LEVEL3, "INFTL: pass 1, explore each unit\n"); + for (first_block = s->firstEUN; first_block <= s->lastEUN; first_block++) { + if (s->PUtable[first_block] != BLOCK_NOTEXPLORED) + continue; + + do_format_chain = 0; + first_logical_block = BLOCK_NIL; + last_block = BLOCK_NIL; + block = first_block; + + for (chain_length = 0; ; chain_length++) { + + if ((chain_length == 0) && + (s->PUtable[block] != BLOCK_NOTEXPLORED)) { + /* Nothing to do here, onto next block */ + break; + } + + if (MTD_READOOB(s->mbd.mtd, block * s->EraseSize + 8, + 8, &retlen, (char *)&h0) < 0 || + MTD_READOOB(s->mbd.mtd, block * s->EraseSize + + 2 * SECTORSIZE + 8, 8, &retlen, (char *)&h1) < 0) { + /* Should never happen? */ + do_format_chain++; + break; + } + + logical_block = le16_to_cpu(h0.virtualUnitNo); + prev_block = le16_to_cpu(h0.prevUnitNo); + erase_mark = le16_to_cpu((h1.EraseMark | h1.EraseMark1)); + ANACtable[block] = h0.ANAC; + + /* Previous block is relative to start of Partition */ + if (prev_block < s->nb_blocks) + prev_block += s->firstEUN; + + /* Already explored partial chain? */ + if (s->PUtable[block] != BLOCK_NOTEXPLORED) { + /* Check if chain for this logical */ + if (logical_block == first_logical_block) { + if (last_block != BLOCK_NIL) + s->PUtable[last_block] = block; + } + break; + } + + /* Check for invalid block */ + if (erase_mark != ERASE_MARK) { + printk(KERN_WARNING "INFTL: corrupt block %d " + "in chain %d, chain length %d, erase " + "mark 0x%x?\n", block, first_block, + chain_length, erase_mark); + /* + * Assume end of chain, probably incomplete + * fold/erase... + */ + if (chain_length == 0) + do_format_chain++; + break; + } + + /* Check for it being free already then... */ + if ((logical_block == BLOCK_FREE) || + (logical_block == BLOCK_NIL)) { + s->PUtable[block] = BLOCK_FREE; + break; + } + + /* Sanity checks on block numbers */ + if ((logical_block >= s->nb_blocks) || + ((prev_block >= s->nb_blocks) && + (prev_block != BLOCK_NIL))) { + if (chain_length > 0) { + printk(KERN_WARNING "INFTL: corrupt " + "block %d in chain %d?\n", + block, first_block); + do_format_chain++; + } + break; + } + + if (first_logical_block == BLOCK_NIL) { + first_logical_block = logical_block; + } else { + if (first_logical_block != logical_block) { + /* Normal for folded chain... */ + break; + } + } + + /* + * Current block is valid, so if we followed a virtual + * chain to get here then we can set the previous + * block pointer in our PUtable now. Then move onto + * the previous block in the chain. + */ + s->PUtable[block] = BLOCK_NIL; + if (last_block != BLOCK_NIL) + s->PUtable[last_block] = block; + last_block = block; + block = prev_block; + + /* Check for end of chain */ + if (block == BLOCK_NIL) + break; + + /* Validate next block before following it... */ + if (block > s->lastEUN) { + printk(KERN_WARNING "INFTL: invalid previous " + "block %d in chain %d?\n", block, + first_block); + do_format_chain++; + break; + } + } + + if (do_format_chain) { + format_chain(s, first_block); + continue; + } + + /* + * Looks like a valid chain then. It may not really be the + * newest block in the chain, but it is the newest we have + * found so far. We might update it in later iterations of + * this loop if we find something newer. + */ + s->VUtable[first_logical_block] = first_block; + logical_block = BLOCK_NIL; + } + +#ifdef CONFIG_MTD_DEBUG_VERBOSE + if (CONFIG_MTD_DEBUG_VERBOSE >= 2) + INFTL_dumptables(s); +#endif + + /* + * Second pass, check for infinite loops in chains. These are + * possible because we don't update the previous pointers when + * we fold chains. No big deal, just fix them up in PUtable. + */ + DEBUG(MTD_DEBUG_LEVEL3, "INFTL: pass 2, validate virtual chains\n"); + for (logical_block = 0; logical_block < s->numvunits; logical_block++) { + block = s->VUtable[logical_block]; + last_block = BLOCK_NIL; + + /* Check for free/reserved/nil */ + if (block >= BLOCK_RESERVED) + continue; + + ANAC = ANACtable[block]; + for (i = 0; i < s->numvunits; i++) { + if (s->PUtable[block] == BLOCK_NIL) + break; + if (s->PUtable[block] > s->lastEUN) { + printk(KERN_WARNING "INFTL: invalid prev %d, " + "in virtual chain %d\n", + s->PUtable[block], logical_block); + s->PUtable[block] = BLOCK_NIL; + + } + if (ANACtable[block] != ANAC) { + /* + * Chain must point back to itself. This is ok, + * but we will need adjust the tables with this + * newest block and oldest block. + */ + s->VUtable[logical_block] = block; + s->PUtable[last_block] = BLOCK_NIL; + break; + } + + ANAC--; + last_block = block; + block = s->PUtable[block]; + } + + if (i >= s->nb_blocks) { + /* + * Uhoo, infinite chain with valid ANACS! + * Format whole chain... + */ + format_chain(s, first_block); + } + } + +#ifdef CONFIG_MTD_DEBUG_VERBOSE + if (CONFIG_MTD_DEBUG_VERBOSE >= 2) + INFTL_dumptables(s); + if (CONFIG_MTD_DEBUG_VERBOSE >= 2) + INFTL_dumpVUchains(s); +#endif + + /* + * Third pass, format unreferenced blocks and init free block count. + */ + s->numfreeEUNs = 0; + s->LastFreeEUN = BLOCK_NIL; + + DEBUG(MTD_DEBUG_LEVEL3, "INFTL: pass 3, format unused blocks\n"); + for (block = s->firstEUN; block <= s->lastEUN; block++) { + if (s->PUtable[block] == BLOCK_NOTEXPLORED) { + printk("INFTL: unreferenced block %d, formatting it\n", + block); + if (INFTL_formatblock(s, block) < 0) + s->PUtable[block] = BLOCK_RESERVED; + else + s->PUtable[block] = BLOCK_FREE; + } + if (s->PUtable[block] == BLOCK_FREE) { + s->numfreeEUNs++; + if (s->LastFreeEUN == BLOCK_NIL) + s->LastFreeEUN = block; + } + } + + kfree(ANACtable); + return 0; +} |