* Patches by Xianghua Xiao, 15 Oct 2003:

[people/ms/u-boot.git] / fs / jffs2 / jffs2_1pass.c

/*
-------------------------------------------------------------------------
 * Filename:      jffs2.c
 * Version:       $Id: jffs2_1pass.c,v 1.7 2002/01/25 01:56:47 nyet Exp $
 * Copyright:     Copyright (C) 2001, Russ Dill
 * Author:        Russ Dill <Russ.Dill@asu.edu>
 * Description:   Module to load kernel from jffs2
 *-----------------------------------------------------------------------*/
/*
 * some portions of this code are taken from jffs2, and as such, the
 * following copyright notice is included.
 *
 * JFFS2 -- Journalling Flash File System, Version 2.
 *
 * Copyright (C) 2001 Red Hat, Inc.
 *
 * Created by David Woodhouse <dwmw2@cambridge.redhat.com>
 *
 * The original JFFS, from which the design for JFFS2 was derived,
 * was designed and implemented by Axis Communications AB.
 *
 * The contents of this file are subject to the Red Hat eCos Public
 * License Version 1.1 (the "Licence"); you may not use this file
 * except in compliance with the Licence.  You may obtain a copy of
 * the Licence at http://www.redhat.com/
 *
 * Software distributed under the Licence is distributed on an "AS IS"
 * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.
 * See the Licence for the specific language governing rights and
 * limitations under the Licence.
 *
 * The Original Code is JFFS2 - Journalling Flash File System, version 2
 *
 * Alternatively, the contents of this file may be used under the
 * terms of the GNU General Public License version 2 (the "GPL"), in
 * which case the provisions of the GPL are applicable instead of the
 * above.  If you wish to allow the use of your version of this file
 * only under the terms of the GPL and not to allow others to use your
 * version of this file under the RHEPL, indicate your decision by
 * deleting the provisions above and replace them with the notice and
 * other provisions required by the GPL.  If you do not delete the
 * provisions above, a recipient may use your version of this file
 * under either the RHEPL or the GPL.
 *
 * $Id: jffs2_1pass.c,v 1.7 2002/01/25 01:56:47 nyet Exp $
 *
 */

/* Ok, so anyone who knows the jffs2 code will probably want to get a papar
 * bag to throw up into before reading this code. I looked through the jffs2
 * code, the caching scheme is very elegant. I tried to keep the version
 * for a bootloader as small and simple as possible. Instead of worring about
 * unneccesary data copies, node scans, etc, I just optimized for the known
 * common case, a kernel, which looks like:
 *      (1) most pages are 4096 bytes
 *      (2) version numbers are somewhat sorted in acsending order
 *      (3) multiple compressed blocks making up one page is uncommon
 *
 * So I create a linked list of decending version numbers (insertions at the
 * head), and then for each page, walk down the list, until a matching page
 * with 4096 bytes is found, and then decompress the watching pages in
 * reverse order.
 *
 */

/*
 * Adapted by Nye Liu <nyet@zumanetworks.com> and
 * Rex Feany <rfeany@zumanetworks.com>
 * on Jan/2002 for U-Boot.
 *
 * Clipped out all the non-1pass functions, cleaned up warnings,
 * wrappers, etc. No major changes to the code.
 * Please, he really means it when he said have a paper bag
 * handy. We needed it ;).
 *
 */

/*
 * Bugfixing by Kai-Uwe Bloem <kai-uwe.bloem@auerswald.de>, (C) Mar/2003
 *
 * - overhaul of the memory management. Removed much of the "paper-bagging"
 *   in that part of the code, fixed several bugs, now frees memory when
 *   partition is changed.
 *   It's still ugly :-(
 * - fixed a bug in jffs2_1pass_read_inode where the file length calculation
 *   was incorrect. Removed a bit of the paper-bagging as well.
 * - removed double crc calculation for fragment headers in jffs2_private.h
 *   for speedup.
 * - scan_empty rewritten in a more "standard" manner (non-paperbag, that is).
 * - spinning wheel now spins depending on how much memory has been scanned
 * - lots of small changes all over the place to "improve" readability.
 * - implemented fragment sorting to ensure that the newest data is copied
 *   if there are multiple copies of fragments for a certain file offset.
 *
 * The fragment sorting feature must be enabled by CFG_JFFS2_SORT_FRAGMENTS.
 * Sorting is done while adding fragments to the lists, which is more or less a
 * bubble sort. This takes a lot of time, and is most probably not an issue if
 * the boot filesystem is always mounted readonly.
 *
 * You should define it if the boot filesystem is mounted writable, and updates
 * to the boot files are done by copying files to that filesystem.
 *
 *
 * There's a big issue left: endianess is completely ignored in this code. Duh!
 *
 *
 * You still should have paper bags at hand :-(. The code lacks more or less
 * any comment, and is still arcane and difficult to read in places. As this
 * is incompatible with any new code from the jffs2 maintainers anyway, it
 * should probably be dumped and replaced by something like jffs2reader!
 */


#include <common.h>
#include <config.h>
#include <malloc.h>
#include <linux/stat.h>
#include <linux/time.h>

#if (CONFIG_COMMANDS & CFG_CMD_JFFS2)

#include <jffs2/jffs2.h>
#include <jffs2/jffs2_1pass.h>

#include "jffs2_private.h"


#define NODE_CHUNK      1024    /* size of memory allocation chunk in b_nodes */
#define SPIN_BLKSIZE    18      /* spin after having scanned 1<<BLKSIZE bytes */

/* Debugging switches */
#undef  DEBUG_DIRENTS           /* print directory entry list after scan */
#undef  DEBUG_FRAGMENTS         /* print fragment list after scan */
#undef  DEBUG                           /* enable debugging messages */


#ifdef  DEBUG
# define DEBUGF(fmt,args...)    printf(fmt ,##args)
#else
# define DEBUGF(fmt,args...)
#endif


/* Compression names */
static char *compr_names[] = {
        "NONE",
        "ZERO",
        "RTIME",
        "RUBINMIPS",
        "COPY",
        "DYNRUBIN",
        "ZLIB"
};

/* Spinning wheel */
static char spinner[] = { '|', '/', '-', '\\' };

/* Memory management */
struct mem_block {
        u32     index;
        struct mem_block *next;
        struct b_node nodes[NODE_CHUNK];
};


static void
free_nodes(struct b_list *list)
{
        while (list->listMemBase != NULL) {
                struct mem_block *next = list->listMemBase->next;
                free( list->listMemBase );
                list->listMemBase = next;
        }
}

static struct b_node *
add_node(struct b_list *list)
{
        u32 index = 0;
        struct mem_block *memBase;
        struct b_node *b;

        memBase = list->listMemBase;
        if (memBase != NULL)
                index = memBase->index;
#if 0
        putLabeledWord("add_node: index = ", index);
        putLabeledWord("add_node: memBase = ", list->listMemBase);
#endif

        if (memBase == NULL || index >= NODE_CHUNK) {
                /* we need more space before we continue */
                memBase = mmalloc(sizeof(struct mem_block));
                if (memBase == NULL) {
                        putstr("add_node: malloc failed\n");
                        return NULL;
                }
                memBase->next = list->listMemBase;
                index = 0;
#if 0
                putLabeledWord("add_node: alloced a new membase at ", *memBase);
#endif

        }
        /* now we have room to add it. */
        b = &memBase->nodes[index];
        index ++;

        memBase->index = index;
        list->listMemBase = memBase;
        list->listCount++;
        return b;
}

static struct b_node *
insert_node(struct b_list *list, u32 offset)
{
        struct b_node *new;
#ifdef CFG_JFFS2_SORT_FRAGMENTS
        struct b_node *b, *prev;
#endif

        if (!(new = add_node(list))) {
                putstr("add_node failed!\r\n");
                return NULL;
        }
        new->offset = offset;

#ifdef CFG_JFFS2_SORT_FRAGMENTS
        if (list->listTail != NULL && list->listCompare(new, list->listTail))
                prev = list->listTail;
        else if (list->listLast != NULL && list->listCompare(new, list->listLast))
                prev = list->listLast;
        else
                prev = NULL;

        for (b = (prev ? prev->next : list->listHead);
             b != NULL && list->listCompare(new, b);
             prev = b, b = b->next) {
                list->listLoops++;
        }
        if (b != NULL)
                list->listLast = prev;

        if (b != NULL) {
                new->next = b;
                if (prev != NULL)
                        prev->next = new;
                else
                        list->listHead = new;
        } else
#endif
        {
                new->next = (struct b_node *) NULL;
                if (list->listTail != NULL) {
                        list->listTail->next = new;
                        list->listTail = new;
                } else {
                        list->listTail = list->listHead = new;
                }
        }

        return new;
}

#ifdef CFG_JFFS2_SORT_FRAGMENTS
/* Sort data entries with the latest version last, so that if there
 * is overlapping data the latest version will be used.
 */
static int compare_inodes(struct b_node *new, struct b_node *old)
{
        struct jffs2_raw_inode *jNew = (struct jffs2_raw_inode *)new->offset;
        struct jffs2_raw_inode *jOld = (struct jffs2_raw_inode *)old->offset;

        return jNew->version > jOld->version;
}

/* Sort directory entries so all entries in the same directory
 * with the same name are grouped together, with the latest version
 * last. This makes it easy to eliminate all but the latest version
 * by marking the previous version dead by setting the inode to 0.
 */
static int compare_dirents(struct b_node *new, struct b_node *old)
{
        struct jffs2_raw_dirent *jNew = (struct jffs2_raw_dirent *)new->offset;
        struct jffs2_raw_dirent *jOld = (struct jffs2_raw_dirent *)old->offset;
        int cmp;

        /* ascending sort by pino */
        if (jNew->pino != jOld->pino)
                return jNew->pino > jOld->pino;

        /* pino is the same, so use ascending sort by nsize, so
         * we don't do strncmp unless we really must.
         */
        if (jNew->nsize != jOld->nsize)
                return jNew->nsize > jOld->nsize;

        /* length is also the same, so use ascending sort by name
         */
        cmp = strncmp(jNew->name, jOld->name, jNew->nsize);
        if (cmp != 0)
                return cmp > 0;

        /* we have duplicate names in this directory, so use ascending
         * sort by version
         */
        if (jNew->version > jOld->version) {
                /* since jNew is newer, we know jOld is not valid, so
                 * mark it with inode 0 and it will not be used
                 */
                jOld->ino = 0;
                return 1;
        }

        return 0;
}
#endif

static u32
jffs2_scan_empty(u32 start_offset, struct part_info *part)
{
        char *max = part->offset + part->size - sizeof(struct jffs2_raw_inode);
        char *offset = part->offset + start_offset;

        while (offset < max && *(u32 *)offset == 0xFFFFFFFF) {
                offset += sizeof(u32);
                /* return if spinning is due */
                if (((u32)offset & ((1 << SPIN_BLKSIZE)-1)) == 0) break;
        }

        return offset - part->offset;
}

static u32
jffs_init_1pass_list(struct part_info *part)
{
        struct b_lists *pL;

        if (part->jffs2_priv != NULL) {
                pL = (struct b_lists *)part->jffs2_priv;
                free_nodes(&pL->frag);
                free_nodes(&pL->dir);
                free(pL);
        }
        if (NULL != (part->jffs2_priv = malloc(sizeof(struct b_lists)))) {
                pL = (struct b_lists *)part->jffs2_priv;

                memset(pL, 0, sizeof(*pL));
#ifdef CFG_JFFS2_SORT_FRAGMENTS
                pL->dir.listCompare = compare_dirents;
                pL->frag.listCompare = compare_inodes;
#endif
        }
        return 0;
}

/* find the inode from the slashless name given a parent */
static long
jffs2_1pass_read_inode(struct b_lists *pL, u32 inode, char *dest)
{
        struct b_node *b;
        struct jffs2_raw_inode *jNode;
        u32 totalSize = 0;
        u32 latestVersion = 0;
        char *lDest;
        char *src;
        long ret;
        int i;
        u32 counter = 0;
#ifdef CFG_JFFS2_SORT_FRAGMENTS
        /* Find file size before loading any data, so fragments that
         * start past the end of file can be ignored. A fragment
         * that is partially in the file is loaded, so extra data may
         * be loaded up to the next 4K boundary above the file size.
         * This shouldn't cause trouble when loading kernel images, so
         * we will live with it.
         */
        for (b = pL->frag.listHead; b != NULL; b = b->next) {
                jNode = (struct jffs2_raw_inode *) (b->offset);
                if ((inode == jNode->ino)) {
                        /* get actual file length from the newest node */
                        if (jNode->version >= latestVersion) {
                                totalSize = jNode->isize;
                                latestVersion = jNode->version;
                        }
                }
        }
#endif

        for (b = pL->frag.listHead; b != NULL; b = b->next) {
                jNode = (struct jffs2_raw_inode *) (b->offset);
                if ((inode == jNode->ino)) {
#if 0
                        putLabeledWord("\r\n\r\nread_inode: totlen = ", jNode->totlen);
                        putLabeledWord("read_inode: inode = ", jNode->ino);
                        putLabeledWord("read_inode: version = ", jNode->version);
                        putLabeledWord("read_inode: isize = ", jNode->isize);
                        putLabeledWord("read_inode: offset = ", jNode->offset);
                        putLabeledWord("read_inode: csize = ", jNode->csize);
                        putLabeledWord("read_inode: dsize = ", jNode->dsize);
                        putLabeledWord("read_inode: compr = ", jNode->compr);
                        putLabeledWord("read_inode: usercompr = ", jNode->usercompr);
                        putLabeledWord("read_inode: flags = ", jNode->flags);
#endif

#ifndef CFG_JFFS2_SORT_FRAGMENTS
                        /* get actual file length from the newest node */
                        if (jNode->version >= latestVersion) {
                                totalSize = jNode->isize;
                                latestVersion = jNode->version;
                        }
#endif

                        if(dest) {
                                src = ((char *) jNode) + sizeof(struct jffs2_raw_inode);
                                /* ignore data behind latest known EOF */
                                if (jNode->offset > totalSize)
                                        continue;

                                lDest = (char *) (dest + jNode->offset);
#if 0
                                putLabeledWord("read_inode: src = ", src);
                                putLabeledWord("read_inode: dest = ", lDest);
#endif
                                switch (jNode->compr) {
                                case JFFS2_COMPR_NONE:
                                        ret = (unsigned long) ldr_memcpy(lDest, src, jNode->dsize);
                                        break;
                                case JFFS2_COMPR_ZERO:
                                        ret = 0;
                                        for (i = 0; i < jNode->dsize; i++)
                                                *(lDest++) = 0;
                                        break;
                                case JFFS2_COMPR_RTIME:
                                        ret = 0;
                                        rtime_decompress(src, lDest, jNode->csize, jNode->dsize);
                                        break;
                                case JFFS2_COMPR_DYNRUBIN:
                                        /* this is slow but it works */
                                        ret = 0;
                                        dynrubin_decompress(src, lDest, jNode->csize, jNode->dsize);
                                        break;
                                case JFFS2_COMPR_ZLIB:
                                        ret = zlib_decompress(src, lDest, jNode->csize, jNode->dsize);
                                        break;
                                default:
                                        /* unknown */
                                        putLabeledWord("UNKOWN COMPRESSION METHOD = ", jNode->compr);
                                        return -1;
                                        break;
                                }
                        }

#if 0
                        putLabeledWord("read_inode: totalSize = ", totalSize);
                        putLabeledWord("read_inode: compr ret = ", ret);
#endif
                }
                counter++;
        }

#if 0
        putLabeledWord("read_inode: returning = ", totalSize);
#endif
        return totalSize;
}

/* find the inode from the slashless name given a parent */
static u32
jffs2_1pass_find_inode(struct b_lists * pL, const char *name, u32 pino)
{
        struct b_node *b;
        struct jffs2_raw_dirent *jDir;
        int len;
        u32 counter;
        u32 version = 0;
        u32 inode = 0;

        /* name is assumed slash free */
        len = strlen(name);

        counter = 0;
        /* we need to search all and return the inode with the highest version */
        for(b = pL->dir.listHead; b; b = b->next, counter++) {
                jDir = (struct jffs2_raw_dirent *) (b->offset);
                if ((pino == jDir->pino) && (len == jDir->nsize) &&
                    (jDir->ino) &&      /* 0 for unlink */
                    (!strncmp(jDir->name, name, len))) {        /* a match */
                        if (jDir->version < version)
                                continue;

                        if (jDir->version == version && inode != 0) {
                                /* I'm pretty sure this isn't legal */
                                putstr(" ** ERROR ** ");
                                putnstr(jDir->name, jDir->nsize);
                                putLabeledWord(" has dup version =", version);
                        }
                        inode = jDir->ino;
                        version = jDir->version;
                }
#if 0
                putstr("\r\nfind_inode:p&l ->");
                putnstr(jDir->name, jDir->nsize);
                putstr("\r\n");
                putLabeledWord("pino = ", jDir->pino);
                putLabeledWord("nsize = ", jDir->nsize);
                putLabeledWord("b = ", (u32) b);
                putLabeledWord("counter = ", counter);
#endif
        }
        return inode;
}

static char *mkmodestr(unsigned long mode, char *str)
{
        static const char *l = "xwr";
        int mask = 1, i;
        char c;

        switch (mode & S_IFMT) {
                case S_IFDIR:    str[0] = 'd'; break;
                case S_IFBLK:    str[0] = 'b'; break;
                case S_IFCHR:    str[0] = 'c'; break;
                case S_IFIFO:    str[0] = 'f'; break;
                case S_IFLNK:    str[0] = 'l'; break;
                case S_IFSOCK:   str[0] = 's'; break;
                case S_IFREG:    str[0] = '-'; break;
                default:         str[0] = '?';
        }

        for(i = 0; i < 9; i++) {
                c = l[i%3];
                str[9-i] = (mode & mask)?c:'-';
                mask = mask<<1;
        }

        if(mode & S_ISUID) str[3] = (mode & S_IXUSR)?'s':'S';
        if(mode & S_ISGID) str[6] = (mode & S_IXGRP)?'s':'S';
        if(mode & S_ISVTX) str[9] = (mode & S_IXOTH)?'t':'T';
        str[10] = '\0';
        return str;
}

static inline void dump_stat(struct stat *st, const char *name)
{
        char str[20];
        char s[64], *p;

        if (st->st_mtime == (time_t)(-1)) /* some ctimes really hate -1 */
                st->st_mtime = 1;

        ctime_r(&st->st_mtime, s/*,64*/); /* newlib ctime doesn't have buflen */

        if ((p = strchr(s,'\n')) != NULL) *p = '\0';
        if ((p = strchr(s,'\r')) != NULL) *p = '\0';

/*
        printf("%6lo %s %8ld %s %s\n", st->st_mode, mkmodestr(st->st_mode, str),
                st->st_size, s, name);
*/

        printf(" %s %8ld %s %s", mkmodestr(st->st_mode,str), st->st_size, s, name);
}

static inline u32 dump_inode(struct b_lists * pL, struct jffs2_raw_dirent *d, struct jffs2_raw_inode *i)
{
        char fname[256];
        struct stat st;

        if(!d || !i) return -1;

        strncpy(fname, d->name, d->nsize);
        fname[d->nsize] = '\0';

        memset(&st,0,sizeof(st));

        st.st_mtime = i->mtime;
        st.st_mode = i->mode;
        st.st_ino = i->ino;

        /* neither dsize nor isize help us.. do it the long way */
        st.st_size = jffs2_1pass_read_inode(pL, i->ino, NULL);

        dump_stat(&st, fname);

        if (d->type == DT_LNK) {
                unsigned char *src = (unsigned char *) (&i[1]);
                putstr(" -> ");
                putnstr(src, (int)i->dsize);
        }

        putstr("\r\n");

        return 0;
}

/* list inodes with the given pino */
static u32
jffs2_1pass_list_inodes(struct b_lists * pL, u32 pino)
{
        struct b_node *b;
        struct jffs2_raw_dirent *jDir;

        for (b = pL->dir.listHead; b; b = b->next) {
                jDir = (struct jffs2_raw_dirent *) (b->offset);
                if ((pino == jDir->pino) && (jDir->ino)) { /* ino=0 -> unlink */
                        u32 i_version = 0;
                        struct jffs2_raw_inode *jNode, *i = NULL;
                        struct b_node *b2 = pL->frag.listHead;

                        while (b2) {
                                jNode = (struct jffs2_raw_inode *) (b2->offset);
                                if (jNode->ino == jDir->ino
                                    && jNode->version >= i_version)
                                        i = jNode;
                                b2 = b2->next;
                        }

                        dump_inode(pL, jDir, i);
                }
        }
        return pino;
}

static u32
jffs2_1pass_search_inode(struct b_lists * pL, const char *fname, u32 pino)
{
        int i;
        char tmp[256];
        char working_tmp[256];
        char *c;

        /* discard any leading slash */
        i = 0;
        while (fname[i] == '/')
                i++;
        strcpy(tmp, &fname[i]);

        while ((c = (char *) strchr(tmp, '/'))) /* we are still dired searching */
        {
                strncpy(working_tmp, tmp, c - tmp);
                working_tmp[c - tmp] = '\0';
#if 0
                putstr("search_inode: tmp = ");
                putstr(tmp);
                putstr("\r\n");
                putstr("search_inode: wtmp = ");
                putstr(working_tmp);
                putstr("\r\n");
                putstr("search_inode: c = ");
                putstr(c);
                putstr("\r\n");
#endif
                for (i = 0; i < strlen(c) - 1; i++)
                        tmp[i] = c[i + 1];
                tmp[i] = '\0';
#if 0
                putstr("search_inode: post tmp = ");
                putstr(tmp);
                putstr("\r\n");
#endif

                if (!(pino = jffs2_1pass_find_inode(pL, working_tmp, pino))) {
                        putstr("find_inode failed for name=");
                        putstr(working_tmp);
                        putstr("\r\n");
                        return 0;
                }
        }
        /* this is for the bare filename, directories have already been mapped */
        if (!(pino = jffs2_1pass_find_inode(pL, tmp, pino))) {
                putstr("find_inode failed for name=");
                putstr(tmp);
                putstr("\r\n");
                return 0;
        }
        return pino;

}

static u32
jffs2_1pass_resolve_inode(struct b_lists * pL, u32 ino)
{
        struct b_node *b;
        struct b_node *b2;
        struct jffs2_raw_dirent *jDir;
        struct jffs2_raw_inode *jNode;
        struct jffs2_raw_dirent *jDirFound = NULL;
        char tmp[256];
        u32 version = 0;
        u32 pino;
        unsigned char *src;

        /* we need to search all and return the inode with the highest version */
        for(b = pL->dir.listHead; b; b = b->next) {
                jDir = (struct jffs2_raw_dirent *) (b->offset);
                if (ino == jDir->ino) {
                        if (jDir->version < version)
                                continue;

                        if (jDir->version == version && jDirFound) {
                                /* I'm pretty sure this isn't legal */
                                putstr(" ** ERROR ** ");
                                putnstr(jDir->name, jDir->nsize);
                                putLabeledWord(" has dup version (resolve) = ",
                                        version);
                        }

                        jDirFound = jDir;
                        version = jDir->version;
                }
        }
        /* now we found the right entry again. (shoulda returned inode*) */
        if (jDirFound->type != DT_LNK)
                return jDirFound->ino;

        /* it's a soft link so we follow it again. */
        b2 = pL->frag.listHead;
        while (b2) {
                jNode = (struct jffs2_raw_inode *) (b2->offset);
                if (jNode->ino == jDirFound->ino) {
                        src = (unsigned char *) (b2->offset + sizeof(struct jffs2_raw_inode));

#if 0
                        putLabeledWord("\t\t dsize = ", jNode->dsize);
                        putstr("\t\t target = ");
                        putnstr(src, jNode->dsize);
                        putstr("\r\n");
#endif
                        strncpy(tmp, src, jNode->dsize);
                        tmp[jNode->dsize] = '\0';
                        break;
                }
                b2 = b2->next;
        }
        /* ok so the name of the new file to find is in tmp */
        /* if it starts with a slash it is root based else shared dirs */
        if (tmp[0] == '/')
                pino = 1;
        else
                pino = jDirFound->pino;

        return jffs2_1pass_search_inode(pL, tmp, pino);
}

static u32
jffs2_1pass_search_list_inodes(struct b_lists * pL, const char *fname, u32 pino)
{
        int i;
        char tmp[256];
        char working_tmp[256];
        char *c;

        /* discard any leading slash */
        i = 0;
        while (fname[i] == '/')
                i++;
        strcpy(tmp, &fname[i]);
        working_tmp[0] = '\0';
        while ((c = (char *) strchr(tmp, '/'))) /* we are still dired searching */
        {
                strncpy(working_tmp, tmp, c - tmp);
                working_tmp[c - tmp] = '\0';
                for (i = 0; i < strlen(c) - 1; i++)
                        tmp[i] = c[i + 1];
                tmp[i] = '\0';
                /* only a failure if we arent looking at top level */
                if (!(pino = jffs2_1pass_find_inode(pL, working_tmp, pino)) &&
                    (working_tmp[0])) {
                        putstr("find_inode failed for name=");
                        putstr(working_tmp);
                        putstr("\r\n");
                        return 0;
                }
        }

        if (tmp[0] && !(pino = jffs2_1pass_find_inode(pL, tmp, pino))) {
                putstr("find_inode failed for name=");
                putstr(tmp);
                putstr("\r\n");
                return 0;
        }
        /* this is for the bare filename, directories have already been mapped */
        if (!(pino = jffs2_1pass_list_inodes(pL, pino))) {
                putstr("find_inode failed for name=");
                putstr(tmp);
                putstr("\r\n");
                return 0;
        }
        return pino;

}

unsigned char
jffs2_1pass_rescan_needed(struct part_info *part)
{
        struct b_node *b;
        struct jffs2_unknown_node *node;
        struct b_lists *pL = (struct b_lists *)part->jffs2_priv;

        if (part->jffs2_priv == 0){
                DEBUGF ("rescan: First time in use\n");
                return 1;
        }
        /* if we have no list, we need to rescan */
        if (pL->frag.listCount == 0) {
                DEBUGF ("rescan: fraglist zero\n");
                return 1;
        }

        /* or if we are scanning a new partition */
        if (pL->partOffset != part->offset) {
                DEBUGF ("rescan: different partition\n");
                return 1;
        }
        /* but suppose someone reflashed a partition at the same offset... */
        b = pL->dir.listHead;
        while (b) {
                node = (struct jffs2_unknown_node *) (b->offset);
                if (node->nodetype != JFFS2_NODETYPE_DIRENT) {
                        DEBUGF ("rescan: fs changed beneath me? (%lx)\n",
                                        (unsigned long) b->offset);
                        return 1;
                }
                b = b->next;
        }
        return 0;
}

#ifdef DEBUG_FRAGMENTS
static void
dump_fragments(struct b_lists *pL)
{
        struct b_node *b;
        struct jffs2_raw_inode *jNode;

        putstr("\r\n\r\n******The fragment Entries******\r\n");
        b = pL->frag.listHead;
        while (b) {
                jNode = (struct jffs2_raw_inode *) (b->offset);
                putLabeledWord("\r\n\tbuild_list: FLASH_OFFSET = ", b->offset);
                putLabeledWord("\tbuild_list: totlen = ", jNode->totlen);
                putLabeledWord("\tbuild_list: inode = ", jNode->ino);
                putLabeledWord("\tbuild_list: version = ", jNode->version);
                putLabeledWord("\tbuild_list: isize = ", jNode->isize);
                putLabeledWord("\tbuild_list: atime = ", jNode->atime);
                putLabeledWord("\tbuild_list: offset = ", jNode->offset);
                putLabeledWord("\tbuild_list: csize = ", jNode->csize);
                putLabeledWord("\tbuild_list: dsize = ", jNode->dsize);
                putLabeledWord("\tbuild_list: compr = ", jNode->compr);
                putLabeledWord("\tbuild_list: usercompr = ", jNode->usercompr);
                putLabeledWord("\tbuild_list: flags = ", jNode->flags);
                putLabeledWord("\tbuild_list: offset = ", b->offset);   /* FIXME: ? [RS] */
                b = b->next;
        }
}
#endif

#ifdef DEBUG_DIRENTS
static void
dump_dirents(struct b_lists *pL)
{
        struct b_node *b;
        struct jffs2_raw_dirent *jDir;

        putstr("\r\n\r\n******The directory Entries******\r\n");
        b = pL->dir.listHead;
        while (b) {
                jDir = (struct jffs2_raw_dirent *) (b->offset);
                putstr("\r\n");
                putnstr(jDir->name, jDir->nsize);
                putLabeledWord("\r\n\tbuild_list: magic = ", jDir->magic);
                putLabeledWord("\tbuild_list: nodetype = ", jDir->nodetype);
                putLabeledWord("\tbuild_list: hdr_crc = ", jDir->hdr_crc);
                putLabeledWord("\tbuild_list: pino = ", jDir->pino);
                putLabeledWord("\tbuild_list: version = ", jDir->version);
                putLabeledWord("\tbuild_list: ino = ", jDir->ino);
                putLabeledWord("\tbuild_list: mctime = ", jDir->mctime);
                putLabeledWord("\tbuild_list: nsize = ", jDir->nsize);
                putLabeledWord("\tbuild_list: type = ", jDir->type);
                putLabeledWord("\tbuild_list: node_crc = ", jDir->node_crc);
                putLabeledWord("\tbuild_list: name_crc = ", jDir->name_crc);
                putLabeledWord("\tbuild_list: offset = ", b->offset);   /* FIXME: ? [RS] */
                b = b->next;
        }
}
#endif

static u32
jffs2_1pass_build_lists(struct part_info * part)
{
        struct b_lists *pL;
        struct jffs2_unknown_node *node;
        u32 offset, oldoffset = 0;
        u32 max = part->size - sizeof(struct jffs2_raw_inode);
        u32 counter = 0;
        u32 counter4 = 0;
        u32 counterF = 0;
        u32 counterN = 0;

        /* turn off the lcd.  Refreshing the lcd adds 50% overhead to the */
        /* jffs2 list building enterprise nope.  in newer versions the overhead is */
        /* only about 5 %.  not enough to inconvenience people for. */
        /* lcd_off(); */

        /* if we are building a list we need to refresh the cache. */
        jffs_init_1pass_list(part);
        pL = (struct b_lists *)part->jffs2_priv;
        pL->partOffset = part->offset;
        offset = 0;
        printf("Scanning JFFS2 FS:   ");

        /* start at the beginning of the partition */
        while (offset < max) {
                if ((oldoffset >> SPIN_BLKSIZE) != (offset >> SPIN_BLKSIZE)) {
                        printf("\b\b%c ", spinner[counter++ % sizeof(spinner)]);
                        oldoffset = offset;
                }

                node = (struct jffs2_unknown_node *) (part->offset + offset);
                if (node->magic == JFFS2_MAGIC_BITMASK && hdr_crc(node)) {
                        /* if its a fragment add it */
                        if (node->nodetype == JFFS2_NODETYPE_INODE &&
                                    inode_crc((struct jffs2_raw_inode *) node)) {
                                if (insert_node(&pL->frag, (u32) part->offset +
                                                                offset) == NULL)
                                        return 0;
                        } else if (node->nodetype == JFFS2_NODETYPE_DIRENT &&
                                   dirent_crc((struct jffs2_raw_dirent *) node)  &&
                                   dirent_name_crc((struct jffs2_raw_dirent *) node)) {
                                if (! (counterN%100))
                                        printf("\b\b.  ");
                                if (insert_node(&pL->dir, (u32) part->offset +
                                                                offset) == NULL)
                                        return 0;
                                counterN++;
                        } else if (node->nodetype == JFFS2_NODETYPE_CLEANMARKER) {
                                if (node->totlen != sizeof(struct jffs2_unknown_node))
                                        printf("OOPS Cleanmarker has bad size "
                                                "%d != %d\n", node->totlen,
                                                sizeof(struct jffs2_unknown_node));
                        } else if (node->nodetype == JFFS2_NODETYPE_PADDING) {
                                if (node->totlen < sizeof(struct jffs2_unknown_node))
                                        printf("OOPS Padding has bad size "
                                                "%d < %d\n", node->totlen,
                                                sizeof(struct jffs2_unknown_node));
                        } else {
                                printf("Unknown node type: %x len %d "
                                        "offset 0x%x\n", node->nodetype,
                                        node->totlen, offset);
                        }
                        offset += ((node->totlen + 3) & ~3);
                        counterF++;
                } else if (node->magic == JFFS2_EMPTY_BITMASK &&
                           node->nodetype == JFFS2_EMPTY_BITMASK) {
                        offset = jffs2_scan_empty(offset, part);
                } else {        /* if we know nothing, we just step and look. */
                        offset += 4;
                        counter4++;
                }
/*             printf("unknown node magic %4.4x %4.4x @ %lx\n", node->magic, node->nodetype, (unsigned long)node); */

        }

        putstr("\b\b done.\r\n");               /* close off the dots */
        /* turn the lcd back on. */
        /* splash(); */

#if 0
        putLabeledWord("dir entries = ", pL->dir.listCount);
        putLabeledWord("frag entries = ", pL->frag.listCount);
        putLabeledWord("+4 increments = ", counter4);
        putLabeledWord("+file_offset increments = ", counterF);

#endif

#ifdef DEBUG_DIRENTS
        dump_dirents(pL);
#endif

#ifdef DEBUG_FRAGMENTS
        dump_fragments(pL);
#endif

        /* give visual feedback that we are done scanning the flash */
        led_blink(0x0, 0x0, 0x1, 0x1);  /* off, forever, on 100ms, off 100ms */
        return 1;
}


static u32
jffs2_1pass_fill_info(struct b_lists * pL, struct b_jffs2_info * piL)
{
        struct b_node *b;
        struct jffs2_raw_inode *jNode;
        int i;

        for (i = 0; i < JFFS2_NUM_COMPR; i++) {
                piL->compr_info[i].num_frags = 0;
                piL->compr_info[i].compr_sum = 0;
                piL->compr_info[i].decompr_sum = 0;
        }

        b = pL->frag.listHead;
        while (b) {
                jNode = (struct jffs2_raw_inode *) (b->offset);
                if (jNode->compr < JFFS2_NUM_COMPR) {
                        piL->compr_info[jNode->compr].num_frags++;
                        piL->compr_info[jNode->compr].compr_sum += jNode->csize;
                        piL->compr_info[jNode->compr].decompr_sum += jNode->dsize;
                }
                b = b->next;
        }
        return 0;
}


static struct b_lists *
jffs2_get_list(struct part_info * part, const char *who)
{
        if (jffs2_1pass_rescan_needed(part)) {
                if (!jffs2_1pass_build_lists(part)) {
                        printf("%s: Failed to scan JFFSv2 file structure\n", who);
                        return NULL;
                }
        }
        return (struct b_lists *)part->jffs2_priv;
}


/* Print directory / file contents */
u32
jffs2_1pass_ls(struct part_info * part, const char *fname)
{
        struct b_lists *pl;
        long ret = 0;
        u32 inode;

        if (! (pl = jffs2_get_list(part, "ls")))
                return 0;

        if (! (inode = jffs2_1pass_search_list_inodes(pl, fname, 1))) {
                putstr("ls: Failed to scan jffs2 file structure\r\n");
                return 0;
        }


#if 0
        putLabeledWord("found file at inode = ", inode);
        putLabeledWord("read_inode returns = ", ret);
#endif

        return ret;
}


/* Load a file from flash into memory. fname can be a full path */
u32
jffs2_1pass_load(char *dest, struct part_info * part, const char *fname)
{

        struct b_lists *pl;
        long ret = 0;
        u32 inode;

        if (! (pl  = jffs2_get_list(part, "load")))
                return 0;

        if (! (inode = jffs2_1pass_search_inode(pl, fname, 1))) {
                putstr("load: Failed to find inode\r\n");
                return 0;
        }

        /* Resolve symlinks */
        if (! (inode = jffs2_1pass_resolve_inode(pl, inode))) {
                putstr("load: Failed to resolve inode structure\r\n");
                return 0;
        }

        if ((ret = jffs2_1pass_read_inode(pl, inode, dest)) < 0) {
                putstr("load: Failed to read inode\r\n");
                return 0;
        }

        DEBUGF ("load: loaded '%s' to 0x%lx (%ld bytes)\n", fname,
                                (unsigned long) dest, ret);
        return ret;
}

/* Return information about the fs on this partition */
u32
jffs2_1pass_info(struct part_info * part)
{
        struct b_jffs2_info info;
        struct b_lists *pl;
        int i;

        if (! (pl  = jffs2_get_list(part, "info")))
                return 0;

        jffs2_1pass_fill_info(pl, &info);
        for (i = 0; i < JFFS2_NUM_COMPR; i++) {
                printf("Compression: %s\n", compr_names[i]);
                printf("\tfrag count: %d\n", info.compr_info[i].num_frags);
                printf("\tcompressed sum: %d\n", info.compr_info[i].compr_sum);
                printf("\tuncompressed sum: %d\n", info.compr_info[i].decompr_sum);
        }
        return 1;
}

#endif /* CFG_CMD_JFFS2 */