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-rw-r--r--fs/romfs/romfs.c270
1 files changed, 270 insertions, 0 deletions
diff --git a/fs/romfs/romfs.c b/fs/romfs/romfs.c
new file mode 100644
index 000000000..b7d96964b
--- /dev/null
+++ b/fs/romfs/romfs.c
@@ -0,0 +1,270 @@
+/*
+ * (C) Copyright 2007 Michal Simek
+ *
+ * Michal SIMEK <monstr@monstr.eu>
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * 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 <common.h>
+#include <malloc.h>
+#include <command.h>
+
+#if (CONFIG_COMMANDS & CFG_CMD_JFFS2)
+
+#include <asm/byteorder.h>
+#include <linux/stat.h>
+#include <jffs2/jffs2.h>
+#include <jffs2/load_kernel.h>
+
+#undef DEBUG_ROMFS
+
+/* ROMFS superblock */
+struct romfs_super {
+ u32 word0;
+ u32 word1;
+ u32 size;
+ u32 checksum;
+ char name[0];
+};
+
+struct romfs_inode {
+ u32 next;
+ u32 spec;
+ u32 size;
+ u32 checksum;
+ char name[0];
+};
+
+extern flash_info_t flash_info[];
+#define PART_OFFSET(x) (x->offset + flash_info[x->dev->id->num].start[0])
+#define ALIGN(x) (((x) & 0xfffffff0))
+#define HEADERSIZE(name) (0x20 + ALIGN(strlen(name)))
+
+static unsigned long romfs_resolve (unsigned long begin, unsigned long offset,
+ unsigned long size, int raw, char *filename)
+{
+ unsigned long inodeoffset = 0, nextoffset;
+ struct romfs_inode *inode;
+#ifdef DEBUG_ROMFS
+ printf ("ROMFS_resolve: begin 0x%x, offset 0x%x, size 0x%x, raw 0x%x, \
+ filename %s\n", begin, offset, size, raw, filename);
+#endif
+
+ while (inodeoffset < size) {
+ inode = (struct romfs_inode *)(begin + offset + inodeoffset);
+ offset = 0;
+ nextoffset = ALIGN (inode->next);
+#ifdef DEBUG_ROMFS
+ printf("inode 0x%x, name %s - len 0x%x, next inode 0x%x, \
+ compare names 0x%x\n",
+ inode, inode->name, strlen (inode->name), nextoffset,
+ strncmp (filename, inode->name, strlen (filename)));
+#endif
+ if (!strncmp (filename, inode->name, strlen (inode->name))) {
+ char *p = strtok (NULL, "/");
+ if (raw && (p == NULL || *p == '\0')) {
+ return offset + inodeoffset;
+ }
+ return romfs_resolve (begin,
+ inodeoffset + HEADERSIZE (inode->name),
+ size, raw, p);
+ }
+ inodeoffset = nextoffset;
+ }
+
+ printf ("can't find corresponding entry\n");
+ return 0;
+}
+
+int romfs_load (char *loadoffset, struct part_info *info, char *filename)
+{
+ struct romfs_inode *inode;
+ struct romfs_super *sb;
+ char *data;
+ int pocet;
+ sb = (struct romfs_super *) PART_OFFSET (info);
+
+ unsigned long offset;
+
+ offset = romfs_resolve (PART_OFFSET (info), HEADERSIZE (sb->name),
+ sb->size, 1, strtok (filename, "/"));
+ if (offset <= 0)
+ return offset;
+
+ inode = (struct romfs_inode *)(PART_OFFSET (info) + offset);
+ data = (char *)((int)inode + HEADERSIZE (inode->name));
+ pocet = inode->size;
+ while (pocet--) {
+ *loadoffset++ = *data++;
+ }
+ return inode->size;
+}
+
+static int romfs_list_inode (struct part_info *info, unsigned long offset)
+{
+ struct romfs_inode *inode =
+ (struct romfs_inode *)(PART_OFFSET (info) + offset);
+ struct romfs_inode *hardlink = NULL;
+ char str[3], *data;
+
+/* mapping spec.info means
+ * 0 hard link link destination [file header]
+ * 1 directory first file's header
+ * 2 regular file unused, must be zero [MBZ]
+ * 3 symbolic link unused, MBZ (file data is the link content)
+ * 4 block device 16/16 bits major/minor number
+ * 5 char device - " -
+ * 6 socket unused, MBZ
+ * 7 fifo unused, MBZ
+ */
+ switch (inode->next & 0x7) {
+ case 0:
+ str[0] = 'h';
+ break;
+ case 1:
+ str[0] = 'd';
+ break;
+ case 2:
+ str[0] = 'f';
+ break;
+ case 3:
+ str[0] = 'l';
+ break;
+ case 4:
+ str[0] = 'b';
+ break;
+ case 5:
+ str[0] = 'c';
+ break;
+ case 6:
+ str[0] = 's';
+ break;
+ case 7:
+ str[0] = 'p';
+ break;
+ default:
+ str[0] = '?';
+ }
+
+ if (inode->next & 0x8) {
+ str[1] = 'x';
+ } else {
+ str[1] = '-';
+ }
+ str[2] = '\0';
+
+ if ((str[0] == 'b') || (str[0] == 'c')) {
+#ifdef DEBUG_ROMFS
+ printf (" %s %3d,%3d %12s 0x%08x 0x%08x", str,
+ (inode->spec & 0xffff0000) >> 16,
+ inode->spec & 0x0000ffff, inode->name, inode,
+ inode->spec);
+#else
+ printf (" %s %3d,%3d %12s", str,
+ (inode->spec & 0xffff0000) >> 16,
+ inode->spec & 0x0000ffff);
+#endif
+ } else {
+#ifdef DEBUG_ROMFS
+ printf (" %s %7d %12s 0x%08x 0x%08x", str, inode->size,
+ inode->name, inode, inode->spec);
+#else
+ printf (" %s %7d %12s", str, inode->size, inode->name);
+#endif
+ if (str[0] == 'l') {
+ data = (char *)((int)inode + HEADERSIZE (inode->name));
+ puts (" -> ");
+ puts (data);
+ }
+ if (str[0] == 'h') {
+ hardlink = (struct romfs_inode *)(PART_OFFSET (info) +
+ inode->spec);
+ puts (" -> ");
+ puts (hardlink->name);
+ }
+ }
+ puts ("\n");
+ return ALIGN (inode->next);
+}
+
+int romfs_ls (struct part_info *info, char *filename)
+{
+ struct romfs_inode *inode;
+ unsigned long inodeoffset = 0, nextoffset;
+ unsigned long offset, size;
+ struct romfs_super *sb;
+ sb = (struct romfs_super *)PART_OFFSET (info);
+
+ if (strlen (filename) == 0 || !strcmp (filename, "/")) {
+ offset = HEADERSIZE (sb->name);
+ size = sb->size;
+ } else {
+ offset = romfs_resolve (PART_OFFSET (info),
+ HEADERSIZE (sb->name), sb->size, 1,
+ strtok (filename, "/"));
+
+ if (offset == 0) {
+ return offset;
+ }
+ inode = (struct romfs_inode *)(PART_OFFSET (info) + offset);
+ if ((inode->next & 0x7) != 1) {
+ return (romfs_list_inode (info, offset) > 0);
+ }
+
+ size = sb->size;
+ offset = offset + HEADERSIZE (inode->name);
+ }
+
+ inodeoffset = offset + inodeoffset;
+ while (inodeoffset < size) {
+ nextoffset = romfs_list_inode (info, inodeoffset);
+ if (nextoffset == 0)
+ break;
+ inodeoffset = nextoffset;
+ }
+ return 1;
+}
+
+int romfs_info (struct part_info *info)
+{
+ struct romfs_super *sb;
+ sb = (struct romfs_super *)PART_OFFSET (info);
+
+ printf ("name: \t\t%s, len %d B\n", sb->name, strlen (sb->name));
+ printf ("size of SB:\t%d B\n", HEADERSIZE (sb->name));
+ printf ("full size:\t%d B\n", sb->size);
+ printf ("checksum:\t0x%x\n", sb->checksum);
+ return 0;
+}
+
+int romfs_check (struct part_info *info)
+{
+ struct romfs_super *sb;
+ if (info->dev->id->type != MTD_DEV_TYPE_NOR)
+ return 0;
+
+ sb = (struct romfs_super *)PART_OFFSET (info);
+ if ((sb->word0 != 0x2D726F6D) || (sb->word1 != 0x3166732D)) {
+ return 0;
+ }
+ return 1;
+}
+
+#endif
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