Eric Lee / smarc-ti-linux-kernel | Embedian Git Server

Commit 1b002d7b173ae7cc15ed90d3c07f6d106babc510

Authored by Bob Copeland 2008-07-26 10:45:15 +0800

Committed by Linus Torvalds 2008-07-27 03:00:05 +0800

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>

Showing 2 changed files with 147 additions and 0 deletions Side-by-side Diff

fs/omfs/omfs.h
fs/omfs/omfs_fs.h

fs/omfs/omfs.h

Diff comments View file @ 1b002d7

	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 */
	10	+struct 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 */
	29	+static inline sector_t clus_to_blk(struct omfs_sb_info *sbi, sector_t block)
	30	+{
	31	+ return block << sbi->s_block_shift;
	32	+}
	33	+
	34	+static inline struct omfs_sb_info OMFS_SB(struct super_block sb)
	35	+{
	36	+ return sb->s_fs_info;
	37	+}
	38	+
	39	+/* bitmap.c */
	40	+extern unsigned long omfs_count_free(struct super_block *sb);
	41	+extern int omfs_allocate_block(struct super_block *sb, u64 block);
	42	+extern int omfs_allocate_range(struct super_block *sb, int min_request,
	43	+ int max_request, u64 return_block, int return_size);
	44	+extern int omfs_clear_range(struct super_block *sb, u64 block, int count);
	45	+
	46	+/* dir.c */
	47	+extern struct file_operations omfs_dir_operations;
	48	+extern struct inode_operations omfs_dir_inops;
	49	+extern int omfs_make_empty(struct inode inode, struct super_block sb);
	50	+extern int omfs_is_bad(struct omfs_sb_info sbi, struct omfs_header header,
	51	+ u64 fsblock);
	52	+
	53	+/* file.c */
	54	+extern struct file_operations omfs_file_operations;
	55	+extern struct inode_operations omfs_file_inops;
	56	+extern struct address_space_operations omfs_aops;
	57	+extern void omfs_make_empty_table(struct buffer_head *bh, int offset);
	58	+extern int omfs_shrink_inode(struct inode *inode);
	59	+
	60	+/* inode.c */
	61	+extern struct inode omfs_iget(struct super_block sb, ino_t inode);
	62	+extern struct inode omfs_new_inode(struct inode dir, int mode);
	63	+extern int omfs_reserve_block(struct super_block *sb, sector_t block);
	64	+extern int omfs_find_empty_block(struct super_block sb, int mode, ino_t ino);
	65	+extern int omfs_sync_inode(struct inode *inode);
	66	+
	67	+#endif

fs/omfs/omfs_fs.h

Diff comments View file @ 1b002d7

	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	+
	21	+struct 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	+
	31	+struct 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	+
	43	+struct 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	+
	55	+struct 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	+
	68	+struct 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	+
	73	+struct 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