[RFC][PATCH 1/7] omfs: filesystem headers

[Bob Copeland <me@bobcopeland.com>]

This patch defines basic on-disk and memory structures used by
OMFS and prototypes for various functions.

---

 fs/omfs/omfs.h |  147 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 147 insertions(+), 0 deletions(-)
 create mode 100644 fs/omfs/omfs.h

be5e7e0aa517140d139dbb250a3659e991310bbd
diff --git a/fs/omfs/omfs.h b/fs/omfs/omfs.h
new file mode 100644
index 0000000..1f4f495
--- /dev/null
+++ b/fs/omfs/omfs.h
@@ -0,0 +1,147 @@
+#ifndef _OMFS_H
+#define _OMFS_H
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/fs.h>
+
+#define OMFS_MAGIC 0xC2993D87
+#define OMFS_IMAGIC 0xD2
+
+#define OMFS_DIR 'D'
+#define OMFS_FILE 'F'
+#define OMFS_INODE_NORMAL 'e'
+#define OMFS_INODE_SYSTEM 's'
+#define OMFS_NAMELEN 256
+#define OMFS_DIR_START 0x1b8
+#define OMFS_EXTENT_START 0x1d0
+#define OMFS_EXTENT_CONT 0x40
+#define OMFS_XOR_COUNT 19
+
+// Still experimental
+// #define OMFS_WRITE
+
+#define OMFS_STATE_NEW 1
+
+/* In-memory structures */
+struct omfs_sb_info {
+	u64 s_num_blocks;
+	u64 s_bitmap_ino;
+	u64 s_root_ino;
+	u32 s_blocksize;
+	u32 s_mirrors;
+	u32 s_sys_blocksize;
+	u32 s_clustersize;
+	int s_block_shift;
+	unsigned long **s_imap;
+	int s_imap_size;
+};
+
+struct omfs_inode_info {
+	u8 i_state;	
+	struct inode vfs_inode;
+};
+
+/* On-disk structures */
+struct omfs_super_block {
+	char s_fill1[256];
+	__be64 s_root_block;
+	__be64 s_num_blocks;
+	__be32 s_magic;
+	__be32 s_blocksize;
+	__be32 s_mirrors;
+	__be32 s_sys_blocksize;
+};
+
+struct omfs_header {
+	__be64 h_self;
+	__be32 h_body_size;
+	__be16 h_crc;
+	char h_fill1[2];
+	u8 h_version;       
+	char h_type;
+	u8 h_magic;
+	u8 h_check_xor;
+	__be32 h_fill2;
+};
+
+struct omfs_root_block {
+	struct omfs_header r_head;
+	__be64 r_fill1;
+	__be64 r_num_blocks;
+	__be64 r_root_dir;
+	__be64 r_bitmap;
+	__be32 r_blocksize;
+	__be32 r_clustersize;
+	__be64 r_mirrors;
+	char r_name[OMFS_NAMELEN];
+};
+
+struct omfs_inode {
+	struct omfs_header i_head;
+	__be64 i_parent;
+	__be64 i_sibling;
+	__be64 i_ctime;
+	char i_fill1[35];
+	char i_type;
+	__be32 i_fill2;
+	char i_fill3[64];
+	char i_name[OMFS_NAMELEN];
+	__be64 i_size;
+};
+
+struct omfs_extent_entry {
+	__be64 e_cluster;
+	__be64 e_blocks;
+};
+	
+struct omfs_extent {
+	__be64 e_next;
+	__be32 e_extent_count;
+	__be32 e_fill;
+	struct omfs_extent_entry e_entry;
+};
+
+
+/* convert a cluster number to a 512-byte block number */
+static inline sector_t clus_to_blk(struct omfs_sb_info *sbi, sector_t block)
+{
+	return block << sbi->s_block_shift; 
+}
+
+static inline struct omfs_sb_info *OMFS_SB(struct super_block *sb)
+{
+	return sb->s_fs_info;
+}
+
+static inline struct omfs_inode_info *OMFS_I(struct inode *inode)
+{
+	return list_entry(inode, struct omfs_inode_info, vfs_inode);
+}
+
+/* bitmap.c */
+extern unsigned long omfs_count_free(struct super_block *sb);
+extern int omfs_allocate_block(struct super_block *sb, u64 block);
+extern int omfs_allocate_range(struct super_block *sb, int min_request, 
+			int max_request, u64 *return_block, int *return_size);
+
+/* checksum.c */
+int omfs_update_checksums(struct omfs_inode *oi, struct super_block *sb, 
+		ino_t ino);
+
+/* dir.c */
+extern struct file_operations omfs_dir_operations;
+extern struct inode_operations omfs_dir_inops;
+
+/* file.c */
+extern struct file_operations omfs_file_operations;
+extern struct address_space_operations omfs_aops;
+extern void omfs_make_empty_table(struct buffer_head *bh, int offset);
+
+/* inode.c */
+extern void omfs_read_inode(struct inode *inode);
+extern struct inode *omfs_new_inode(struct inode *dir, int mode);
+extern int omfs_reserve_block(struct super_block *sb, sector_t block);
+extern int omfs_find_empty_block(struct super_block *sb, int mode, ino_t *ino);
+
+#endif
-- 
1.2.1