omfs: define filesystem structures

Add header files containing OMFS on-disk and memory structures.

Signed-off-by: Bob Copeland <me@bobcopeland.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/fs/omfs/omfs.h b/fs/omfs/omfs.h
new file mode 100644 (file)
index 0000000..2bc0f06
--- /dev/null
+++ b/fs/omfs/omfs.h
@@ -0,0 +1,67 @@
+#ifndef _OMFS_H
+#define _OMFS_H
+
+#include <linux/module.h>
+#include <linux/fs.h>
+
+#include "omfs_fs.h"
+
+/* 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 mutex s_bitmap_lock;
+       int s_uid;
+       int s_gid;
+       int s_dmask;
+       int s_fmask;
+};
+
+/* convert a cluster number to a scaled 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;
+}
+
+/* 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);
+extern int omfs_clear_range(struct super_block *sb, u64 block, int count);
+
+/* dir.c */
+extern struct file_operations omfs_dir_operations;
+extern struct inode_operations omfs_dir_inops;
+extern int omfs_make_empty(struct inode *inode, struct super_block *sb);
+extern int omfs_is_bad(struct omfs_sb_info *sbi, struct omfs_header *header,
+                       u64 fsblock);
+
+/* file.c */
+extern struct file_operations omfs_file_operations;
+extern struct inode_operations omfs_file_inops;
+extern struct address_space_operations omfs_aops;
+extern void omfs_make_empty_table(struct buffer_head *bh, int offset);
+extern int omfs_shrink_inode(struct inode *inode);
+
+/* inode.c */
+extern struct inode *omfs_iget(struct super_block *sb, ino_t 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);
+extern int omfs_sync_inode(struct inode *inode);
+
+#endif

diff --git a/fs/omfs/omfs_fs.h b/fs/omfs/omfs_fs.h
new file mode 100644 (file)
index 0000000..12cca24
--- /dev/null
+++ b/fs/omfs/omfs_fs.h
@@ -0,0 +1,80 @@
+#ifndef _OMFS_FS_H
+#define _OMFS_FS_H
+
+/* OMFS On-disk structures */
+
+#define OMFS_MAGIC 0xC2993D87
+#define OMFS_IMAGIC 0xD2
+
+#define OMFS_DIR 'D'
+#define OMFS_FILE 'F'
+#define OMFS_INODE_NORMAL 'e'
+#define OMFS_INODE_CONTINUATION 'c'
+#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
+#define OMFS_MAX_BLOCK_SIZE 8192
+
+struct omfs_super_block {
+       char s_fill1[256];
+       __be64 s_root_block;            /* block number of omfs_root_block */
+       __be64 s_num_blocks;            /* total number of FS blocks */
+       __be32 s_magic;                 /* OMFS_MAGIC */
+       __be32 s_blocksize;             /* size of a block */
+       __be32 s_mirrors;               /* # of mirrors of system blocks */
+       __be32 s_sys_blocksize;         /* size of non-data blocks */
+};
+
+struct omfs_header {
+       __be64 h_self;                  /* FS block where this is located */
+       __be32 h_body_size;             /* size of useful data after header */
+       __be16 h_crc;                   /* crc-ccitt of body_size bytes */
+       char h_fill1[2];
+       u8 h_version;                   /* version, always 1 */
+       char h_type;                    /* OMFS_INODE_X */
+       u8 h_magic;                     /* OMFS_IMAGIC */
+       u8 h_check_xor;                 /* XOR of header bytes before this */
+       __be32 h_fill2;
+};
+
+struct omfs_root_block {
+       struct omfs_header r_head;      /* header */
+       __be64 r_fill1;
+       __be64 r_num_blocks;            /* total number of FS blocks */
+       __be64 r_root_dir;              /* block # of root directory */
+       __be64 r_bitmap;                /* block # of free space bitmap */
+       __be32 r_blocksize;             /* size of a block */
+       __be32 r_clustersize;           /* size allocated for data blocks */
+       __be64 r_mirrors;               /* # of mirrors of system blocks */
+       char r_name[OMFS_NAMELEN];      /* partition label */
+};
+
+struct omfs_inode {
+       struct omfs_header i_head;      /* header */
+       __be64 i_parent;                /* parent containing this inode */
+       __be64 i_sibling;               /* next inode in hash bucket */
+       __be64 i_ctime;                 /* ctime, in milliseconds */
+       char i_fill1[35];
+       char i_type;                    /* OMFS_[DIR,FILE] */
+       __be32 i_fill2;
+       char i_fill3[64];
+       char i_name[OMFS_NAMELEN];      /* filename */
+       __be64 i_size;                  /* size of file, in bytes */
+};
+
+struct omfs_extent_entry {
+       __be64 e_cluster;               /* start location of a set of blocks */
+       __be64 e_blocks;                /* number of blocks after e_cluster */
+};
+
+struct omfs_extent {
+       __be64 e_next;                  /* next extent table location */
+       __be32 e_extent_count;          /* total # extents in this table */
+       __be32 e_fill;
+       struct omfs_extent_entry e_entry;       /* start of extent entries */
+};
+
+#endif