Add common (with Linux) MTD partition scheme and "mtdparts" command

Old, obsolete and duplicated code was cleaned up and replace by the
new partitioning method. There are two possible approaches now:
* define a single, static partition
* use mtdparts command line option and dynamic partitioning
Default is static partitioning.

1 files changed, 23 insertions, 15 deletions

diff --git a/fs/cramfs/cramfs.c b/fs/cramfs/cramfs.c
index 98ff567..f02bf3c 100644
--- a/fs/cramfs/cramfs.c
+++ b/fs/cramfs/cramfs.c
@@ -42,17 +42,22 @@
 
 struct cramfs_super super;
 
+/* CPU address space offset calculation macro, struct part_info offset is
+ * device address space offset, so we need to shift it by a device start address. */
+extern flash_info_t flash_info[CFG_MAX_FLASH_BANKS];
+#define PART_OFFSET(x)	(x->offset + flash_info[x->dev->id->num].start[0])
+
 static int cramfs_read_super (struct part_info *info)
 {
 	unsigned long root_offset;
 
 	/* Read the first block and get the superblock from it */
-	memcpy (&super, (void *) info->offset, sizeof (super));
+	memcpy (&super, (void *) PART_OFFSET(info), sizeof (super));
 
 	/* Do sanity checks on the superblock */
 	if (super.magic != CRAMFS_32 (CRAMFS_MAGIC)) {
 		/* check at 512 byte offset */
-		memcpy (&super, (void *) info->offset + 512, sizeof (super));
+		memcpy (&super, (void *) PART_OFFSET(info) + 512, sizeof (super));
 		if (super.magic != CRAMFS_32 (CRAMFS_MAGIC)) {
 			printf ("cramfs: wrong magic\n");
 			return -1;
@@ -87,7 +92,7 @@ static int cramfs_read_super (struct part_info *info)
 	return 0;
 }
 
-static unsigned long cramfs_resolve (char *begin, unsigned long offset,
+static unsigned long cramfs_resolve (unsigned long begin, unsigned long offset,
 				     unsigned long size, int raw,
 				     char *filename)
 {
@@ -150,7 +155,7 @@ static unsigned long cramfs_resolve (char *begin, unsigned long offset,
 	return 0;
 }
 
-static int cramfs_uncompress (char *begin, unsigned long offset,
+static int cramfs_uncompress (unsigned long begin, unsigned long offset,
 			      unsigned long loadoffset)
 {
 	struct cramfs_inode *inode = (struct cramfs_inode *) (begin + offset);
@@ -187,7 +192,7 @@ int cramfs_load (char *loadoffset, struct part_info *info, char *filename)
 	if (cramfs_read_super (info))
 		return -1;
 
-	offset = cramfs_resolve (info->offset,
+	offset = cramfs_resolve (PART_OFFSET(info),
 				 CRAMFS_GET_OFFSET (&(super.root)) << 2,
 				 CRAMFS_24 (super.root.size), 0,
 				 strtok (filename, "/"));
@@ -195,14 +200,14 @@ int cramfs_load (char *loadoffset, struct part_info *info, char *filename)
 	if (offset <= 0)
 		return offset;
 
-	return cramfs_uncompress (info->offset, offset,
+	return cramfs_uncompress (PART_OFFSET(info), offset,
 				  (unsigned long) loadoffset);
 }
 
 static int cramfs_list_inode (struct part_info *info, unsigned long offset)
 {
 	struct cramfs_inode *inode = (struct cramfs_inode *)
-		(info->offset + offset);
+		(PART_OFFSET(info) + offset);
 	char *name, str[20];
 	int namelen, nextoff;
 
@@ -233,7 +238,7 @@ static int cramfs_list_inode (struct part_info *info, unsigned long offset)
 		unsigned long size = CRAMFS_24 (inode->size);
 		char *link = malloc (size);
 
-		if (link != NULL && cramfs_uncompress (info->offset, offset,
+		if (link != NULL && cramfs_uncompress (PART_OFFSET(info), offset,
 						       (unsigned long) link)
 		    == size)
 			printf (" -> %*.*s\n", (int) size, (int) size, link);
@@ -262,7 +267,7 @@ int cramfs_ls (struct part_info *info, char *filename)
 		size = CRAMFS_24 (super.root.size);
 	} else {
 		/* Resolve the path */
-		offset = cramfs_resolve (info->offset,
+		offset = cramfs_resolve (PART_OFFSET(info),
 					 CRAMFS_GET_OFFSET (&(super.root)) <<
 					 2, CRAMFS_24 (super.root.size), 1,
 					 strtok (filename, "/"));
@@ -271,7 +276,7 @@ int cramfs_ls (struct part_info *info, char *filename)
 			return offset;
 
 		/* Resolving was successful. Examine the inode */
-		inode = (struct cramfs_inode *) (info->offset + offset);
+		inode = (struct cramfs_inode *) (PART_OFFSET(info) + offset);
 		if (!S_ISDIR (CRAMFS_16 (inode->mode))) {
 			/* It's not a directory - list it, and that's that */
 			return (cramfs_list_inode (info, offset) > 0);
@@ -284,7 +289,7 @@ int cramfs_ls (struct part_info *info, char *filename)
 
 	/* List the given directory */
 	while (inodeoffset < size) {
-		inode = (struct cramfs_inode *) (info->offset + offset +
+		inode = (struct cramfs_inode *) (PART_OFFSET(info) + offset +
 						 inodeoffset);
 
 		nextoffset = cramfs_list_inode (info, offset + inodeoffset);
@@ -324,14 +329,17 @@ int cramfs_info (struct part_info *info)
 
 int cramfs_check (struct part_info *info)
 {
-	struct cramfs_super *sb = (struct cramfs_super *) info->offset;
+	struct cramfs_super *sb;
+
+	if (info->dev->id->type != MTD_DEV_TYPE_NOR)
+		return 0;
 
+	sb = (struct cramfs_super *) PART_OFFSET(info);
 	if (sb->magic != CRAMFS_32 (CRAMFS_MAGIC)) {
 		/* check at 512 byte offset */
-		sb = (struct cramfs_super *) (info->offset + 512);
-		if (sb->magic != CRAMFS_32 (CRAMFS_MAGIC)) {
+		sb = (struct cramfs_super *) (PART_OFFSET(info) + 512);
+		if (sb->magic != CRAMFS_32 (CRAMFS_MAGIC))
 			return 0;
-		}
 	}
 	return 1;
 }