efs_fs_i.h
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上传日期:2009-04-28
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- /*
- * efs_fs_i.h
- *
- * Copyright (c) 1999 Al Smith
- *
- * Portions derived from IRIX header files (c) 1988 Silicon Graphics
- */
- #ifndef __EFS_FS_I_H__
- #define __EFS_FS_I_H__
- typedef int32_t efs_block_t;
- typedef uint32_t efs_ino_t;
- #define EFS_DIRECTEXTENTS 12
- /*
- * layout of an extent, in memory and on disk. 8 bytes exactly.
- */
- typedef union extent_u {
- unsigned char raw[8];
- struct extent_s {
- unsigned int ex_magic:8; /* magic # (zero) */
- unsigned int ex_bn:24; /* basic block */
- unsigned int ex_length:8; /* numblocks in this extent */
- unsigned int ex_offset:24; /* logical offset into file */
- } cooked;
- } efs_extent;
- typedef struct edevs {
- __be16 odev;
- __be32 ndev;
- } efs_devs;
- /*
- * extent based filesystem inode as it appears on disk. The efs inode
- * is exactly 128 bytes long.
- */
- struct efs_dinode {
- __be16 di_mode; /* mode and type of file */
- __be16 di_nlink; /* number of links to file */
- __be16 di_uid; /* owner's user id */
- __be16 di_gid; /* owner's group id */
- __be32 di_size; /* number of bytes in file */
- __be32 di_atime; /* time last accessed */
- __be32 di_mtime; /* time last modified */
- __be32 di_ctime; /* time created */
- __be32 di_gen; /* generation number */
- __be16 di_numextents; /* # of extents */
- u_char di_version; /* version of inode */
- u_char di_spare; /* spare - used by AFS */
- union di_addr {
- efs_extent di_extents[EFS_DIRECTEXTENTS];
- efs_devs di_dev; /* device for IFCHR/IFBLK */
- } di_u;
- };
- /* efs inode storage in memory */
- struct efs_inode_info {
- int numextents;
- int lastextent;
- efs_extent extents[EFS_DIRECTEXTENTS];
- struct inode vfs_inode;
- };
- #endif /* __EFS_FS_I_H__ */