183 lines
6.7 KiB
C
183 lines
6.7 KiB
C
|
#ifndef EXT2_CONST_H
|
||
|
#define EXT2_CONST_H
|
||
|
|
||
|
/* Tables sizes */
|
||
|
|
||
|
#define NR_INODES 512 /* # slots in "in core" inode table;
|
||
|
* should be more or less the same as
|
||
|
* NR_VNODES in vfs
|
||
|
*/
|
||
|
#define GETDENTS_BUFSIZ 257
|
||
|
|
||
|
#define INODE_HASH_LOG2 7 /* 2 based logarithm of the inode hash size */
|
||
|
#define INODE_HASH_SIZE ((unsigned long)1<<INODE_HASH_LOG2)
|
||
|
#define INODE_HASH_MASK (((unsigned long)1<<INODE_HASH_LOG2)-1)
|
||
|
|
||
|
|
||
|
/* The type of sizeof may be (unsigned) long. Use the following macro for
|
||
|
* taking the sizes of small objects so that there are no surprises like
|
||
|
* (small) long constants being passed to routines expecting an int.
|
||
|
*/
|
||
|
#define usizeof(t) ((unsigned) sizeof(t))
|
||
|
|
||
|
#define SUPER_MAGIC 0xEF53 /* magic number contained in super-block */
|
||
|
|
||
|
#define EXT2_NAME_MAX 255
|
||
|
|
||
|
/* Miscellaneous constants */
|
||
|
#define SU_UID ((uid_t) 0) /* super_user's uid_t */
|
||
|
#define NORMAL 0 /* forces get_block to do disk read */
|
||
|
#define NO_READ 1 /* prevents get_block from doing disk read */
|
||
|
#define PREFETCH 2 /* tells get_block not to read or mark dev */
|
||
|
|
||
|
#define NO_BIT ((bit_t) 0) /* returned by alloc_bit() to signal failure */
|
||
|
|
||
|
#define LOOK_UP 0 /* tells search_dir to lookup string */
|
||
|
#define ENTER 1 /* tells search_dir to make dir entry */
|
||
|
#define DELETE 2 /* tells search_dir to delete entry */
|
||
|
#define IS_EMPTY 3 /* tells search_dir to ret. OK or ENOTEMPTY */
|
||
|
|
||
|
/* write_map() args */
|
||
|
#define WMAP_FREE (1 << 0)
|
||
|
|
||
|
#define IGN_PERM 0
|
||
|
#define CHK_PERM 1
|
||
|
|
||
|
#define IN_CLEAN 0 /* inode disk and memory copies identical */
|
||
|
#define IN_DIRTY 1 /* inode disk and memory copies differ */
|
||
|
#define ATIME 002 /* set if atime field needs updating */
|
||
|
#define CTIME 004 /* set if ctime field needs updating */
|
||
|
#define MTIME 010 /* set if mtime field needs updating */
|
||
|
|
||
|
#define BYTE_SWAP 0 /* tells conv2/conv4 to swap bytes */
|
||
|
|
||
|
#define END_OF_FILE (-104) /* eof detected */
|
||
|
|
||
|
#define SUPER_BLOCK_BYTES (1024) /* bytes offset */
|
||
|
|
||
|
#define ROOT_INODE ((ino_t) 2) /* inode number for root directory */
|
||
|
#define BOOT_BLOCK ((block_t) 0) /* block number of boot block */
|
||
|
#define START_BLOCK ((block_t) 2) /* first block of FS (not counting SB) */
|
||
|
#define BLOCK_ADDRESS_BYTES 4 /* bytes per address */
|
||
|
|
||
|
#define SUPER_SIZE usizeof (struct super_block) /* sb size in RAM */
|
||
|
#define SUPER_SIZE_D (1024) /* max size of superblock stored on disk */
|
||
|
|
||
|
/* Directories related macroses */
|
||
|
|
||
|
#define DIR_ENTRY_ALIGN 4
|
||
|
|
||
|
/* ino + rec_len + name_len + file_type, doesn't include name and padding */
|
||
|
#define MIN_DIR_ENTRY_SIZE 8
|
||
|
|
||
|
#define DIR_ENTRY_CONTENTS_SIZE(d) (MIN_DIR_ENTRY_SIZE + (d)->d_name_len)
|
||
|
|
||
|
/* size with padding */
|
||
|
#define DIR_ENTRY_ACTUAL_SIZE(d) (DIR_ENTRY_CONTENTS_SIZE(d) + \
|
||
|
((DIR_ENTRY_CONTENTS_SIZE(d) & 0x03) == 0 ? 0 : \
|
||
|
DIR_ENTRY_ALIGN - (DIR_ENTRY_CONTENTS_SIZE(d) & 0x03) ))
|
||
|
|
||
|
/* How many bytes can be taken from the end of dentry */
|
||
|
#define DIR_ENTRY_SHRINK(d) (conv2(le_CPU, (d)->d_rec_len) \
|
||
|
- DIR_ENTRY_ACTUAL_SIZE(d))
|
||
|
|
||
|
/* Dentry can have padding, which can be used to enlarge namelen */
|
||
|
#define DIR_ENTRY_MAX_NAME_LEN(d) (conv2(le_CPU, (d)->d_rec_len) \
|
||
|
- MIN_DIR_ENTRY_SIZE)
|
||
|
|
||
|
/* Constants relative to the data blocks */
|
||
|
/* When change EXT2_NDIR_BLOCKS, modify ext2_max_size()!!!*/
|
||
|
#define EXT2_NDIR_BLOCKS 12
|
||
|
#define EXT2_IND_BLOCK EXT2_NDIR_BLOCKS
|
||
|
#define EXT2_DIND_BLOCK (EXT2_IND_BLOCK + 1)
|
||
|
#define EXT2_TIND_BLOCK (EXT2_DIND_BLOCK + 1)
|
||
|
#define EXT2_N_BLOCKS (EXT2_TIND_BLOCK + 1)
|
||
|
|
||
|
#define FS_BITMAP_CHUNKS(b) ((b)/usizeof (bitchunk_t))/* # map chunks/blk */
|
||
|
#define FS_BITCHUNK_BITS (usizeof(bitchunk_t) * CHAR_BIT)
|
||
|
#define FS_BITS_PER_BLOCK(b) (FS_BITMAP_CHUNKS(b) * FS_BITCHUNK_BITS)
|
||
|
|
||
|
/* Inodes */
|
||
|
|
||
|
/* Next 4 following macroses were taken from linux' ext2_fs.h */
|
||
|
#define EXT2_GOOD_OLD_INODE_SIZE 128
|
||
|
#define EXT2_GOOD_OLD_FIRST_INO 11
|
||
|
|
||
|
#define EXT2_INODE_SIZE(s) (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \
|
||
|
EXT2_GOOD_OLD_INODE_SIZE : \
|
||
|
(s)->s_inode_size)
|
||
|
#define EXT2_FIRST_INO(s) (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \
|
||
|
EXT2_GOOD_OLD_FIRST_INO : \
|
||
|
(s)->s_first_ino)
|
||
|
|
||
|
/* Maximum size of a fast symlink including trailing '\0' */
|
||
|
#define MAX_FAST_SYMLINK_LENGTH \
|
||
|
( sizeof(((d_inode *)0)->i_block[0]) * EXT2_N_BLOCKS )
|
||
|
|
||
|
#define NUL(str,l,m) mfs_nul_f(__FILE__,__LINE__,(str), (l), (m))
|
||
|
|
||
|
/* FS states */
|
||
|
#define EXT2_VALID_FS 0x0001 /* Cleanly unmounted */
|
||
|
#define EXT2_ERROR_FS 0x0002 /* Errors detected */
|
||
|
|
||
|
#define EXT2_GOOD_OLD_REV 0 /* The good old (original) format */
|
||
|
#define EXT2_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
|
||
|
|
||
|
/* ext2 features, names shorted (cut EXT2_ prefix) */
|
||
|
#define COMPAT_DIR_PREALLOC 0x0001
|
||
|
#define COMPAT_IMAGIC_INODES 0x0002
|
||
|
#define COMPAT_HAS_JOURNAL 0x0004
|
||
|
#define COMPAT_EXT_ATTR 0x0008
|
||
|
#define COMPAT_RESIZE_INO 0x0010
|
||
|
#define COMPAT_DIR_INDEX 0x0020
|
||
|
#define COMPAT_ANY 0xffffffff
|
||
|
|
||
|
#define RO_COMPAT_SPARSE_SUPER 0x0001
|
||
|
#define RO_COMPAT_LARGE_FILE 0x0002
|
||
|
#define RO_COMPAT_BTREE_DIR 0x0004
|
||
|
#define RO_COMPAT_ANY 0xffffffff
|
||
|
|
||
|
#define INCOMPAT_COMPRESSION 0x0001
|
||
|
#define INCOMPAT_FILETYPE 0x0002
|
||
|
#define INCOMPAT_RECOVER 0x0004
|
||
|
#define INCOMPAT_JOURNAL_DEV 0x0008
|
||
|
#define INCOMPAT_META_BG 0x0010
|
||
|
#define INCOMPAT_ANY 0xffffffff
|
||
|
|
||
|
/* What do we support? */
|
||
|
#define SUPPORTED_INCOMPAT_FEATURES (INCOMPAT_FILETYPE)
|
||
|
#define SUPPORTED_RO_COMPAT_FEATURES (RO_COMPAT_SPARSE_SUPER | \
|
||
|
RO_COMPAT_LARGE_FILE)
|
||
|
|
||
|
/* Ext2 directory file types. Only the low 3 bits are used.
|
||
|
* The other bits are reserved for now.
|
||
|
*/
|
||
|
#define EXT2_FT_UNKNOWN 0
|
||
|
#define EXT2_FT_REG_FILE 1
|
||
|
#define EXT2_FT_DIR 2
|
||
|
#define EXT2_FT_CHRDEV 3
|
||
|
#define EXT2_FT_BLKDEV 4
|
||
|
#define EXT2_FT_FIFO 5
|
||
|
#define EXT2_FT_SOCK 6
|
||
|
#define EXT2_FT_SYMLINK 7
|
||
|
|
||
|
#define EXT2_FT_MAX 8
|
||
|
|
||
|
#define HAS_COMPAT_FEATURE(sp, mask) \
|
||
|
( (sp)->s_feature_compat & (mask) )
|
||
|
#define HAS_RO_COMPAT_FEATURE(sp, mask) \
|
||
|
( (sp)->s_feature_ro_compat & (mask) )
|
||
|
#define HAS_INCOMPAT_FEATURE(sp, mask) \
|
||
|
( (sp)->s_feature_incompat & (mask) )
|
||
|
|
||
|
|
||
|
/* hash-indexed directory */
|
||
|
#define EXT2_INDEX_FL 0x00001000
|
||
|
/* Top of directory hierarchies*/
|
||
|
#define EXT2_TOPDIR_FL 0x00020000
|
||
|
|
||
|
#define EXT2_PREALLOC_BLOCKS 8
|
||
|
|
||
|
|
||
|
#endif /* EXT2_CONST_H */
|