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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>
This commit is contained in:
Bob Copeland
Linus Torvalds
parent
a14e4b572b
commit
1b002d7b17
2 changed files with 147 additions and 0 deletions
67
fs/omfs/omfs.h
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67
fs/omfs/omfs.h
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#ifndef _OMFS_H
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#define _OMFS_H
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#include <linux/module.h>
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#include <linux/fs.h>
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#include "omfs_fs.h"
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/* In-memory structures */
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struct omfs_sb_info {
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u64 s_num_blocks;
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u64 s_bitmap_ino;
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u64 s_root_ino;
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u32 s_blocksize;
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u32 s_mirrors;
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u32 s_sys_blocksize;
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u32 s_clustersize;
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int s_block_shift;
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unsigned long **s_imap;
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int s_imap_size;
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struct mutex s_bitmap_lock;
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int s_uid;
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int s_gid;
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int s_dmask;
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int s_fmask;
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};
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/* convert a cluster number to a scaled block number */
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static inline sector_t clus_to_blk(struct omfs_sb_info *sbi, sector_t block)
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{
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return block << sbi->s_block_shift;
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}
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static inline struct omfs_sb_info *OMFS_SB(struct super_block *sb)
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{
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return sb->s_fs_info;
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}
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/* bitmap.c */
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extern unsigned long omfs_count_free(struct super_block *sb);
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extern int omfs_allocate_block(struct super_block *sb, u64 block);
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extern int omfs_allocate_range(struct super_block *sb, int min_request,
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int max_request, u64 *return_block, int *return_size);
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extern int omfs_clear_range(struct super_block *sb, u64 block, int count);
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/* dir.c */
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extern struct file_operations omfs_dir_operations;
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extern struct inode_operations omfs_dir_inops;
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extern int omfs_make_empty(struct inode *inode, struct super_block *sb);
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extern int omfs_is_bad(struct omfs_sb_info *sbi, struct omfs_header *header,
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u64 fsblock);
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/* file.c */
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extern struct file_operations omfs_file_operations;
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extern struct inode_operations omfs_file_inops;
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extern struct address_space_operations omfs_aops;
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extern void omfs_make_empty_table(struct buffer_head *bh, int offset);
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extern int omfs_shrink_inode(struct inode *inode);
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/* inode.c */
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extern struct inode *omfs_iget(struct super_block *sb, ino_t inode);
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extern struct inode *omfs_new_inode(struct inode *dir, int mode);
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extern int omfs_reserve_block(struct super_block *sb, sector_t block);
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extern int omfs_find_empty_block(struct super_block *sb, int mode, ino_t *ino);
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extern int omfs_sync_inode(struct inode *inode);
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#endif
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80
fs/omfs/omfs_fs.h
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80
fs/omfs/omfs_fs.h
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#ifndef _OMFS_FS_H
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#define _OMFS_FS_H
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/* OMFS On-disk structures */
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#define OMFS_MAGIC 0xC2993D87
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#define OMFS_IMAGIC 0xD2
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#define OMFS_DIR 'D'
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#define OMFS_FILE 'F'
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#define OMFS_INODE_NORMAL 'e'
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#define OMFS_INODE_CONTINUATION 'c'
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#define OMFS_INODE_SYSTEM 's'
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#define OMFS_NAMELEN 256
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#define OMFS_DIR_START 0x1b8
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#define OMFS_EXTENT_START 0x1d0
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#define OMFS_EXTENT_CONT 0x40
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#define OMFS_XOR_COUNT 19
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#define OMFS_MAX_BLOCK_SIZE 8192
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struct omfs_super_block {
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char s_fill1[256];
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__be64 s_root_block; /* block number of omfs_root_block */
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__be64 s_num_blocks; /* total number of FS blocks */
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__be32 s_magic; /* OMFS_MAGIC */
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__be32 s_blocksize; /* size of a block */
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__be32 s_mirrors; /* # of mirrors of system blocks */
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__be32 s_sys_blocksize; /* size of non-data blocks */
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};
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struct omfs_header {
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__be64 h_self; /* FS block where this is located */
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__be32 h_body_size; /* size of useful data after header */
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__be16 h_crc; /* crc-ccitt of body_size bytes */
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char h_fill1[2];
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u8 h_version; /* version, always 1 */
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char h_type; /* OMFS_INODE_X */
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u8 h_magic; /* OMFS_IMAGIC */
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u8 h_check_xor; /* XOR of header bytes before this */
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__be32 h_fill2;
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};
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struct omfs_root_block {
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struct omfs_header r_head; /* header */
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__be64 r_fill1;
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__be64 r_num_blocks; /* total number of FS blocks */
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__be64 r_root_dir; /* block # of root directory */
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__be64 r_bitmap; /* block # of free space bitmap */
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__be32 r_blocksize; /* size of a block */
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__be32 r_clustersize; /* size allocated for data blocks */
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__be64 r_mirrors; /* # of mirrors of system blocks */
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char r_name[OMFS_NAMELEN]; /* partition label */
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};
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struct omfs_inode {
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struct omfs_header i_head; /* header */
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__be64 i_parent; /* parent containing this inode */
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__be64 i_sibling; /* next inode in hash bucket */
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__be64 i_ctime; /* ctime, in milliseconds */
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char i_fill1[35];
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char i_type; /* OMFS_[DIR,FILE] */
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__be32 i_fill2;
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char i_fill3[64];
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char i_name[OMFS_NAMELEN]; /* filename */
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__be64 i_size; /* size of file, in bytes */
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};
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struct omfs_extent_entry {
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__be64 e_cluster; /* start location of a set of blocks */
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__be64 e_blocks; /* number of blocks after e_cluster */
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};
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struct omfs_extent {
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__be64 e_next; /* next extent table location */
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__be32 e_extent_count; /* total # extents in this table */
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__be32 e_fill;
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struct omfs_extent_entry e_entry; /* start of extent entries */
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};
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#endif
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