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authorBob Copeland <me@bobcopeland.com>2008-07-25 22:45:15 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2008-07-26 15:00:05 -0400
commit1b002d7b173ae7cc15ed90d3c07f6d106babc510 (patch)
treeec6c72320e8709547734c89cce1348c6f31208c9
parenta14e4b572b0ee5c6dbe4aceb83d00b2c969324e9 (diff)
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>
Diffstat
-rw-r--r--fs/omfs/omfs.h67
-rw-r--r--fs/omfs/omfs_fs.h80
2 files changed, 147 insertions, 0 deletions
diff --git a/fs/omfs/omfs.h b/fs/omfs/omfs.h
new file mode 100644
index 000000000000..2bc0f0670406
--- /dev/null
+++ b/fs/omfs/omfs.h
@@ -0,0 +1,67 @@
1#ifndef _OMFS_H
2#define _OMFS_H
3
4#include <linux/module.h>
5#include <linux/fs.h>
6
7#include "omfs_fs.h"
8
9/* In-memory structures */
10struct omfs_sb_info {
11 u64 s_num_blocks;
12 u64 s_bitmap_ino;
13 u64 s_root_ino;
14 u32 s_blocksize;
15 u32 s_mirrors;
16 u32 s_sys_blocksize;
17 u32 s_clustersize;
18 int s_block_shift;
19 unsigned long **s_imap;
20 int s_imap_size;
21 struct mutex s_bitmap_lock;
22 int s_uid;
23 int s_gid;
24 int s_dmask;
25 int s_fmask;
26};
27
28/* convert a cluster number to a scaled block number */
29static inline sector_t clus_to_blk(struct omfs_sb_info *sbi, sector_t block)
30{
31 return block << sbi->s_block_shift;
32}
33
34static inline struct omfs_sb_info *OMFS_SB(struct super_block *sb)
35{
36 return sb->s_fs_info;
37}
38
39/* bitmap.c */
40extern unsigned long omfs_count_free(struct super_block *sb);
41extern int omfs_allocate_block(struct super_block *sb, u64 block);
42extern int omfs_allocate_range(struct super_block *sb, int min_request,
43 int max_request, u64 *return_block, int *return_size);
44extern int omfs_clear_range(struct super_block *sb, u64 block, int count);
45
46/* dir.c */
47extern struct file_operations omfs_dir_operations;
48extern struct inode_operations omfs_dir_inops;
49extern int omfs_make_empty(struct inode *inode, struct super_block *sb);
50extern int omfs_is_bad(struct omfs_sb_info *sbi, struct omfs_header *header,
51 u64 fsblock);
52
53/* file.c */
54extern struct file_operations omfs_file_operations;
55extern struct inode_operations omfs_file_inops;
56extern struct address_space_operations omfs_aops;
57extern void omfs_make_empty_table(struct buffer_head *bh, int offset);
58extern int omfs_shrink_inode(struct inode *inode);
59
60/* inode.c */
61extern struct inode *omfs_iget(struct super_block *sb, ino_t inode);
62extern struct inode *omfs_new_inode(struct inode *dir, int mode);
63extern int omfs_reserve_block(struct super_block *sb, sector_t block);
64extern int omfs_find_empty_block(struct super_block *sb, int mode, ino_t *ino);
65extern int omfs_sync_inode(struct inode *inode);
66
67#endif
diff --git a/fs/omfs/omfs_fs.h b/fs/omfs/omfs_fs.h
new file mode 100644
index 000000000000..12cca245d6e8
--- /dev/null
+++ b/fs/omfs/omfs_fs.h
@@ -0,0 +1,80 @@
1#ifndef _OMFS_FS_H
2#define _OMFS_FS_H
3
4/* OMFS On-disk structures */
5
6#define OMFS_MAGIC 0xC2993D87
7#define OMFS_IMAGIC 0xD2
8
9#define OMFS_DIR 'D'
10#define OMFS_FILE 'F'
11#define OMFS_INODE_NORMAL 'e'
12#define OMFS_INODE_CONTINUATION 'c'
13#define OMFS_INODE_SYSTEM 's'
14#define OMFS_NAMELEN 256
15#define OMFS_DIR_START 0x1b8
16#define OMFS_EXTENT_START 0x1d0
17#define OMFS_EXTENT_CONT 0x40
18#define OMFS_XOR_COUNT 19
19#define OMFS_MAX_BLOCK_SIZE 8192
20
21struct omfs_super_block {
22 char s_fill1[256];
23 __be64 s_root_block; /* block number of omfs_root_block */
24 __be64 s_num_blocks; /* total number of FS blocks */
25 __be32 s_magic; /* OMFS_MAGIC */
26 __be32 s_blocksize; /* size of a block */
27 __be32 s_mirrors; /* # of mirrors of system blocks */
28 __be32 s_sys_blocksize; /* size of non-data blocks */
29};
30
31struct omfs_header {
32 __be64 h_self; /* FS block where this is located */
33 __be32 h_body_size; /* size of useful data after header */
34 __be16 h_crc; /* crc-ccitt of body_size bytes */
35 char h_fill1[2];
36 u8 h_version; /* version, always 1 */
37 char h_type; /* OMFS_INODE_X */
38 u8 h_magic; /* OMFS_IMAGIC */
39 u8 h_check_xor; /* XOR of header bytes before this */
40 __be32 h_fill2;
41};
42
43struct omfs_root_block {
44 struct omfs_header r_head; /* header */
45 __be64 r_fill1;
46 __be64 r_num_blocks; /* total number of FS blocks */
47 __be64 r_root_dir; /* block # of root directory */
48 __be64 r_bitmap; /* block # of free space bitmap */
49 __be32 r_blocksize; /* size of a block */
50 __be32 r_clustersize; /* size allocated for data blocks */
51 __be64 r_mirrors; /* # of mirrors of system blocks */
52 char r_name[OMFS_NAMELEN]; /* partition label */
53};
54
55struct omfs_inode {
56 struct omfs_header i_head; /* header */
57 __be64 i_parent; /* parent containing this inode */
58 __be64 i_sibling; /* next inode in hash bucket */
59 __be64 i_ctime; /* ctime, in milliseconds */
60 char i_fill1[35];
61 char i_type; /* OMFS_[DIR,FILE] */
62 __be32 i_fill2;
63 char i_fill3[64];
64 char i_name[OMFS_NAMELEN]; /* filename */
65 __be64 i_size; /* size of file, in bytes */
66};
67
68struct omfs_extent_entry {
69 __be64 e_cluster; /* start location of a set of blocks */
70 __be64 e_blocks; /* number of blocks after e_cluster */
71};
72
73struct omfs_extent {
74 __be64 e_next; /* next extent table location */
75 __be32 e_extent_count; /* total # extents in this table */
76 __be32 e_fill;
77 struct omfs_extent_entry e_entry; /* start of extent entries */
78};
79
80#endif
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-30 10:31:51 -0500