Rewrite of NAND code based on what is in 2.6.12 Linux kernel

Patch by Ladislav Michl, 29 Jun 2005

2 files changed, 1178 insertions, 0 deletions

diff --git a/fs/jffs2/jffs2_nand_1pass.c b/fs/jffs2/jffs2_nand_1pass.c
new file mode 100644
index 0000000000..ce80a43fa1
--- /dev/null
+++ b/fs/jffs2/jffs2_nand_1pass.c
@@ -0,0 +1,1045 @@
+#include <common.h>
+
+#if (CONFIG_COMMANDS & CFG_CMD_JFFS2)
+
+#include <malloc.h>
+#include <linux/stat.h>
+#include <linux/time.h>
+
+#include <jffs2/jffs2.h>
+#include <jffs2/jffs2_1pass.h>
+#include <nand.h>
+
+#include "jffs2_nand_private.h"
+
+#define	NODE_CHUNK  	1024	/* size of memory allocation chunk in b_nodes */
+
+/* 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
+
+static int nanddev = -1; /* nand device of current partition */
+static nand_info_t *nand;
+
+/* Compression names */
+static char *compr_names[] = {
+	"NONE",
+	"ZERO",
+	"RTIME",
+	"RUBINMIPS",
+	"COPY",
+	"DYNRUBIN",
+	"ZLIB",
+#if defined(CONFIG_JFFS2_LZO_LZARI)
+	"LZO",
+	"LZARI",
+#endif
+};
+
+/* Spinning wheel */
+static char spinner[] = { '|', '/', '-', '\\' };
+
+/* Memory management */
+struct mem_block {
+	unsigned index;
+	struct mem_block *next;
+	char nodes[0];
+};
+
+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, int size)
+{
+	u32 index = 0;
+	struct mem_block *memBase;
+	struct b_node *b;
+
+	memBase = list->listMemBase;
+	if (memBase != NULL)
+		index = memBase->index;
+
+	if (memBase == NULL || index >= NODE_CHUNK) {
+		/* we need more space before we continue */
+		memBase = mmalloc(sizeof(struct mem_block) + NODE_CHUNK * size);
+		if (memBase == NULL) {
+			putstr("add_node: malloc failed\n");
+			return NULL;
+		}
+		memBase->next = list->listMemBase;
+		index = 0;
+	}
+	/* now we have room to add it. */
+	b = (struct b_node *)&memBase->nodes[size * index];
+	index ++;
+
+	memBase->index = index;
+	list->listMemBase = memBase;
+	list->listCount++;
+	return b;
+}
+
+static struct b_node *
+insert_node(struct b_list *list, struct b_node *new)
+{
+#ifdef CFG_JFFS2_SORT_FRAGMENTS
+	struct b_node *b, *prev;
+
+	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;
+}
+
+static struct b_node *
+insert_inode(struct b_list *list, struct jffs2_raw_inode *node, u32 offset)
+{
+	struct b_inode *new;
+
+	if (!(new = (struct b_inode *)add_node(list, sizeof(struct b_inode)))) {
+		putstr("add_node failed!\r\n");
+		return NULL;
+	}
+	new->offset = offset;
+	new->version = node->version;
+	new->ino = node->ino;
+	new->isize = node->isize;
+	new->csize = node->csize;
+
+	return insert_node(list, (struct b_node *)new);
+}
+
+static struct b_node *
+insert_dirent(struct b_list *list, struct jffs2_raw_dirent *node, u32 offset)
+{
+	struct b_dirent *new;
+
+	if (!(new = (struct b_dirent *)add_node(list, sizeof(struct b_dirent)))) {
+		putstr("add_node failed!\r\n");
+		return NULL;
+	}
+	new->offset = offset;
+	new->version = node->version;
+	new->pino = node->pino;
+	new->ino = node->ino;
+	new->nhash = full_name_hash(node->name, node->nsize);
+	new->nsize = node->nsize;
+	new->type = node->type;
+
+	return insert_node(list, (struct b_node *)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 ojNew;
+	struct jffs2_raw_inode ojOld;
+	struct jffs2_raw_inode *jNew =
+		(struct jffs2_raw_inode *)get_fl_mem(new->offset, sizeof(ojNew), &ojNew);
+	struct jffs2_raw_inode *jOld =
+		(struct jffs2_raw_inode *)get_fl_mem(old->offset, sizeof(ojOld), &ojOld);
+
+	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 ojNew;
+	struct jffs2_raw_dirent ojOld;
+	struct jffs2_raw_dirent *jNew =
+		(struct jffs2_raw_dirent *)get_fl_mem(new->offset, sizeof(ojNew), &ojNew);
+	struct jffs2_raw_dirent *jOld =
+		(struct jffs2_raw_dirent *)get_fl_mem(old->offset, sizeof(ojOld), &ojOld);
+	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
+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 ino, char *dest,
+		       struct stat *stat)
+{
+	struct b_inode *jNode;
+	u32 totalSize = 0;
+	u32 latestVersion = 0;
+	long ret;
+
+#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 (jNode = (struct b_inode *)pL->frag.listHead; jNode; jNode = jNode->next) {
+		if ((ino == jNode->ino)) {
+			/* get actual file length from the newest node */
+			if (jNode->version >= latestVersion) {
+				totalSize = jNode->isize;
+				latestVersion = jNode->version;
+			}
+		}
+	}
+#endif
+
+	for (jNode = (struct b_inode *)pL->frag.listHead; jNode; jNode = jNode->next) {
+		if ((ino != jNode->ino))
+			continue;
+#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 || stat) {
+			char *src, *dst;
+			char data[4096 + sizeof(struct jffs2_raw_inode)];
+			struct jffs2_raw_inode *inode;
+			size_t len;
+
+			inode = (struct jffs2_raw_inode *)&data;
+			len = sizeof(struct jffs2_raw_inode);
+			if (dest)
+				len += jNode->csize;
+			nand_read(nand, jNode->offset, &len, inode);
+			/* ignore data behind latest known EOF */
+			if (inode->offset > totalSize)
+				continue;
+
+			if (stat) {
+				stat->st_mtime = inode->mtime;
+				stat->st_mode = inode->mode;
+				stat->st_ino = inode->ino;
+				stat->st_size = totalSize;
+			}
+
+			if (!dest)
+				continue;
+
+			src = ((char *) inode) + sizeof(struct jffs2_raw_inode);
+			dst = (char *) (dest + inode->offset);
+
+			switch (inode->compr) {
+			case JFFS2_COMPR_NONE:
+				ret = 0;
+				memcpy(dst, src, inode->dsize);
+				break;
+			case JFFS2_COMPR_ZERO:
+				ret = 0;
+				memset(dst, 0, inode->dsize);
+				break;
+			case JFFS2_COMPR_RTIME:
+				ret = 0;
+				rtime_decompress(src, dst, inode->csize, inode->dsize);
+				break;
+			case JFFS2_COMPR_DYNRUBIN:
+				/* this is slow but it works */
+				ret = 0;
+				dynrubin_decompress(src, dst, inode->csize, inode->dsize);
+				break;
+			case JFFS2_COMPR_ZLIB:
+				ret = zlib_decompress(src, dst, inode->csize, inode->dsize);
+				break;
+#if defined(CONFIG_JFFS2_LZO_LZARI)
+			case JFFS2_COMPR_LZO:
+				ret = lzo_decompress(src, dst, inode->csize, inode->dsize);
+				break;
+			case JFFS2_COMPR_LZARI:
+				ret = lzari_decompress(src, dst, inode->csize, inode->dsize);
+				break;
+#endif
+			default:
+				/* unknown */
+				putLabeledWord("UNKOWN COMPRESSION METHOD = ", inode->compr);
+				return -1;
+			}
+		}
+	}
+
+	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_dirent *jDir;
+	int len = strlen(name);	/* name is assumed slash free */
+	unsigned int nhash = full_name_hash(name, len);
+	u32 version = 0;
+	u32 inode = 0;
+
+	/* we need to search all and return the inode with the highest version */
+	for (jDir = (struct b_dirent *)pL->dir.listHead; jDir; jDir = jDir->next) {
+		if ((pino == jDir->pino) && (jDir->ino) &&	/* 0 for unlink */
+		    (len == jDir->nsize) && (nhash == jDir->nhash)) {
+			/* TODO: compare name */
+			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;
+		}
+	}
+	return inode;
+}
+
+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 int
+dump_inode(struct b_lists *pL, struct b_dirent *d, struct b_inode *i)
+{
+	char fname[JFFS2_MAX_NAME_LEN + 1];
+	struct stat st;
+	size_t len;
+
+	if(!d || !i) return -1;
+	len = d->nsize;
+	nand_read(nand, d->offset + sizeof(struct jffs2_raw_dirent),
+		  &len, &fname);
+	fname[d->nsize] = '\0';
+
+	memset(&st, 0, sizeof(st));
+
+	jffs2_1pass_read_inode(pL, i->ino, NULL, &st);
+
+	dump_stat(&st, fname);
+/* FIXME
+	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_dirent *jDir;
+	u32 i_version = 0;
+
+	for (jDir = (struct b_dirent *)pL->dir.listHead; jDir; jDir = jDir->next) {
+		if ((pino == jDir->pino) && (jDir->ino)) { /* ino=0 -> unlink */
+			struct b_inode *jNode = (struct b_inode *)pL->frag.listHead;
+			struct b_inode *i = NULL;
+
+			while (jNode) {
+				if (jNode->ino == jDir->ino && jNode->version >= i_version) {
+					i_version = jNode->version;
+					i = jNode;
+				}
+				jNode = jNode->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_dirent *jDir;
+	struct b_inode *jNode;
+	u8 jDirFoundType = 0;
+	u32 jDirFoundIno = 0;
+	u32 jDirFoundPino = 0;
+	char tmp[JFFS2_MAX_NAME_LEN + 1];
+	u32 version = 0;
+	u32 pino;
+
+	/* we need to search all and return the inode with the highest version */
+	for (jDir = (struct b_dirent *)pL->dir.listHead; jDir; jDir = jDir->next) {
+		if (ino == jDir->ino) {
+		    	if (jDir->version < version)
+				continue;
+
+			if (jDir->version == version && jDirFoundType) {
+			    	/* I'm pretty sure this isn't legal */
+				putstr(" ** ERROR ** ");
+//				putnstr(jDir->name, jDir->nsize);
+//				putLabeledWord(" has dup version (resolve) = ",
+//					version);
+			}
+
+			jDirFoundType = jDir->type;
+			jDirFoundIno = jDir->ino;
+			jDirFoundPino = jDir->pino;
+			version = jDir->version;
+		}
+	}
+	/* now we found the right entry again. (shoulda returned inode*) */
+	if (jDirFoundType != DT_LNK)
+		return jDirFoundIno;
+
+	/* it's a soft link so we follow it again. */
+	for (jNode = (struct b_inode *)pL->frag.listHead; jNode; jNode = jNode->next) {
+		if (jNode->ino == jDirFoundIno) {
+			size_t len = jNode->csize;
+			nand_read(nand, jNode->offset + sizeof(struct jffs2_raw_inode), &len, &tmp);
+			tmp[jNode->csize] = '\0';
+			break;
+		}
+	}
+	/* 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 = jDirFoundPino;
+
+	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 onode;
+	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;
+	}
+
+#if defined(CONFIG_JFFS2_NAND) && (CONFIG_COMMANDS & CFG_CMD_NAND)
+	if (nanddev != (int)part->usr_priv - 1) {
+		DEBUGF ("rescan: nand device changed\n");
+		return -1;
+	}
+#endif /* defined(CONFIG_JFFS2_NAND) && (CONFIG_COMMANDS & CFG_CMD_NAND) */
+	/* FIXME */
+#if 0
+	/* but suppose someone reflashed a partition at the same offset... */
+	b = pL->dir.listHead;
+	while (b) {
+		node = (struct jffs2_unknown_node *) get_fl_mem(b->offset,
+			sizeof(onode), &onode);
+		if (node->nodetype != JFFS2_NODETYPE_DIRENT) {
+			DEBUGF ("rescan: fs changed beneath me? (%lx)\n",
+					(unsigned long) b->offset);
+			return 1;
+		}
+		b = b->next;
+	}
+#endif
+	return 0;
+}
+
+#ifdef DEBUG_FRAGMENTS
+static void
+dump_fragments(struct b_lists *pL)
+{
+	struct b_node *b;
+	struct jffs2_raw_inode ojNode;
+	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 *) get_fl_mem(b->offset,
+			sizeof(ojNode), &ojNode);
+		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 *) get_node_mem(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;
+		put_fl_mem(jDir);
+	}
+}
+#endif
+
+static int
+jffs2_fill_scan_buf(nand_info_t *nand, unsigned char *buf,
+		    unsigned ofs, unsigned len)
+{
+	int ret;
+	unsigned olen;
+
+	olen = len;
+	ret = nand_read(nand, ofs, &olen, buf);
+	if (ret) {
+		printf("nand_read(0x%x bytes from 0x%x) returned %d\n", len, ofs, ret);
+		return ret;
+	}
+	if (olen < len) {
+		printf("Read at 0x%x gave only 0x%x bytes\n", ofs, olen);
+		return -1;
+	}
+	return 0;
+}
+
+#define	EMPTY_SCAN_SIZE	1024
+static u32
+jffs2_1pass_build_lists(struct part_info * part)
+{
+	struct b_lists *pL;
+	struct jffs2_unknown_node *node;
+	unsigned nr_blocks, sectorsize, ofs, offset;
+	char *buf;
+	int i;
+	u32 counter = 0;
+	u32 counter4 = 0;
+	u32 counterF = 0;
+	u32 counterN = 0;
+
+#if defined(CONFIG_JFFS2_NAND) && (CONFIG_COMMANDS & CFG_CMD_NAND)
+	nanddev = (int)part->usr_priv - 1;
+	nand = &nand_info[nanddev];
+#endif /* defined(CONFIG_JFFS2_NAND) && (CONFIG_COMMANDS & CFG_CMD_NAND) */
+
+	/* 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;
+	puts ("Scanning JFFS2 FS:   ");
+
+	sectorsize = nand->erasesize;
+	nr_blocks = part->size / sectorsize;
+	buf = malloc(sectorsize);
+	if (!buf)
+		return 0;
+
+	for (i = 0; i < nr_blocks; i++) {
+		printf("\b\b%c ", spinner[counter++ % sizeof(spinner)]);
+
+		offset = part->offset + i * sectorsize;
+
+		if (nand_block_isbad(nand, offset))
+			continue;
+
+		if (jffs2_fill_scan_buf(nand, buf, offset, EMPTY_SCAN_SIZE))
+			return 0;
+
+		ofs = 0;
+		/* Scan only 4KiB of 0xFF before declaring it's empty */
+		while (ofs < EMPTY_SCAN_SIZE && *(uint32_t *)(&buf[ofs]) == 0xFFFFFFFF)
+			ofs += 4;
+		if (ofs == EMPTY_SCAN_SIZE)
+			continue;
+
+		if (jffs2_fill_scan_buf(nand, buf + EMPTY_SCAN_SIZE, offset + EMPTY_SCAN_SIZE, sectorsize - EMPTY_SCAN_SIZE))
+			return 0;
+		offset += ofs;
+
+		while (ofs < sectorsize - sizeof(struct jffs2_unknown_node)) {
+			node = (struct jffs2_unknown_node *)&buf[ofs];
+			if (node->magic != JFFS2_MAGIC_BITMASK || !hdr_crc(node)) {
+				offset += 4;
+				ofs += 4;
+				counter4++;
+				continue;
+			}
+			/* if its a fragment add it */
+			if (node->nodetype == JFFS2_NODETYPE_INODE &&
+				    inode_crc((struct jffs2_raw_inode *) node)) {
+				if (insert_inode(&pL->frag, (struct jffs2_raw_inode *) node,
+						 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))
+					puts ("\b\b.  ");
+				if (insert_dirent(&pL->dir, (struct jffs2_raw_dirent *) node,
+						  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);
+			ofs += ((node->totlen + 3) & ~3);
+			counterF++;
+		}
+	}
+
+	putstr("\b\b done.\r\n");		/* close off the dots */
+
+#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 */
+	free(buf);
+
+	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 ojNode;
+	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;
+	}
+/*	FIXME
+	b = pL->frag.listHead;
+	while (b) {
+		jNode = (struct jffs2_raw_inode *) get_fl_mem(b->offset,
+			sizeof(ojNode), &ojNode);
+		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, NULL)) < 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"
+			"\tfrag count: %d\n"
+			"\tcompressed sum: %d\n"
+			"\tuncompressed sum: %d\n",
+			compr_names[i],
+			info.compr_info[i].num_frags,
+			info.compr_info[i].compr_sum,
+			info.compr_info[i].decompr_sum);
+	}
+	return 1;
+}
+
+#endif /* CFG_CMD_JFFS2 */
diff --git a/fs/jffs2/jffs2_nand_private.h b/fs/jffs2/jffs2_nand_private.h
new file mode 100644
index 0000000000..18cca8d076
--- /dev/null
+++ b/fs/jffs2/jffs2_nand_private.h
@@ -0,0 +1,133 @@
+#ifndef jffs2_private_h
+#define jffs2_private_h
+
+#include <jffs2/jffs2.h>
+
+struct b_node {
+	struct b_node *next;
+};
+
+struct b_inode {
+	struct b_inode *next;
+	u32 offset;	/* physical offset to beginning of real inode */
+	u32 version;
+	u32 ino;
+	u32 isize;
+	u32 csize;
+};
+
+struct b_dirent {
+	struct b_dirent *next;
+	u32 offset;	/* physical offset to beginning of real dirent */
+	u32 version;
+	u32 pino;
+	u32 ino;
+	unsigned int nhash;
+	unsigned char nsize;
+	unsigned char type;
+};
+
+struct b_list {
+	struct b_node *listTail;
+	struct b_node *listHead;
+	unsigned int listCount;
+	struct mem_block *listMemBase;
+};
+
+struct b_lists {
+	char *partOffset;
+	struct b_list dir;
+	struct b_list frag;
+};
+
+struct b_compr_info {
+	u32 num_frags;
+	u32 compr_sum;
+	u32 decompr_sum;
+};
+
+struct b_jffs2_info {
+	struct b_compr_info compr_info[JFFS2_NUM_COMPR];
+};
+
+static inline int
+hdr_crc(struct jffs2_unknown_node *node)
+{
+#if 1
+	u32 crc = crc32_no_comp(0, (unsigned char *)node, sizeof(struct jffs2_unknown_node) - 4);
+#else
+	/* what's the semantics of this? why is this here? */
+	u32 crc = crc32_no_comp(~0, (unsigned char *)node, sizeof(struct jffs2_unknown_node) - 4);
+
+	crc ^= ~0;
+#endif
+	if (node->hdr_crc != crc) {
+		return 0;
+	} else {
+		return 1;
+	}
+}
+
+static inline int
+dirent_crc(struct jffs2_raw_dirent *node)
+{
+	if (node->node_crc != crc32_no_comp(0, (unsigned char *)node, sizeof(struct jffs2_raw_dirent) - 8)) {
+		return 0;
+	} else {
+		return 1;
+	}
+}
+
+static inline int
+dirent_name_crc(struct jffs2_raw_dirent *node)
+{
+	if (node->name_crc != crc32_no_comp(0, (unsigned char *)&(node->name), node->nsize)) {
+		return 0;
+	} else {
+		return 1;
+	}
+}
+
+static inline int
+inode_crc(struct jffs2_raw_inode *node)
+{
+	if (node->node_crc != crc32_no_comp(0, (unsigned char *)node, sizeof(struct jffs2_raw_inode) - 8)) {
+		return 0;
+	} else {
+		return 1;
+	}
+}
+
+/* Borrowed from include/linux/dcache.h */
+
+/* Name hashing routines. Initial hash value */
+/* Hash courtesy of the R5 hash in reiserfs modulo sign bits */
+#define init_name_hash()		0
+
+/* partial hash update function. Assume roughly 4 bits per character */
+static inline unsigned long
+partial_name_hash(unsigned long c, unsigned long prevhash)
+{
+	return (prevhash + (c << 4) + (c >> 4)) * 11;
+}
+
+/*
+ * Finally: cut down the number of bits to a int value (and try to avoid
+ * losing bits)
+ */
+static inline unsigned long end_name_hash(unsigned long hash)
+{
+	return (unsigned int) hash;
+}
+
+/* Compute the hash for a name string. */
+static inline unsigned int
+full_name_hash(const unsigned char *name, unsigned int len)
+{
+	unsigned long hash = init_name_hash();
+	while (len--)
+		hash = partial_name_hash(*name++, hash);
+	return end_name_hash(hash);
+}
+
+#endif /* jffs2_private.h */