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

Patch by Ladislav Michl, 29 Jun 2005

1 files changed, 133 insertions, 0 deletions

diff --git a/fs/jffs2/jffs2_nand_private.h b/fs/jffs2/jffs2_nand_private.h
new file mode 100644
index 000000000..18cca8d07
--- /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 */