2010-08-02 13:44:45 +02:00
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#ifndef EXT2_CONST_H
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#define EXT2_CONST_H
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/* Tables sizes */
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2010-08-05 13:37:37 +02:00
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#define NR_INODES 512 /* # slots in "in core" inode table;
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* should be more or less the same as
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* NR_VNODES in vfs
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*/
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2010-08-02 13:44:45 +02:00
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#define GETDENTS_BUFSIZ 257
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#define INODE_HASH_LOG2 7 /* 2 based logarithm of the inode hash size */
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#define INODE_HASH_SIZE ((unsigned long)1<<INODE_HASH_LOG2)
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#define INODE_HASH_MASK (((unsigned long)1<<INODE_HASH_LOG2)-1)
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/* The type of sizeof may be (unsigned) long. Use the following macro for
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* taking the sizes of small objects so that there are no surprises like
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* (small) long constants being passed to routines expecting an int.
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*/
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#define usizeof(t) ((unsigned) sizeof(t))
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#define SUPER_MAGIC 0xEF53 /* magic number contained in super-block */
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#define EXT2_NAME_MAX 255
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/* Miscellaneous constants */
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#define SU_UID ((uid_t) 0) /* super_user's uid_t */
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#define NORMAL 0 /* forces get_block to do disk read */
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#define NO_READ 1 /* prevents get_block from doing disk read */
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#define PREFETCH 2 /* tells get_block not to read or mark dev */
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#define NO_BIT ((bit_t) 0) /* returned by alloc_bit() to signal failure */
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#define LOOK_UP 0 /* tells search_dir to lookup string */
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#define ENTER 1 /* tells search_dir to make dir entry */
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#define DELETE 2 /* tells search_dir to delete entry */
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#define IS_EMPTY 3 /* tells search_dir to ret. OK or ENOTEMPTY */
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/* write_map() args */
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#define WMAP_FREE (1 << 0)
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#define IGN_PERM 0
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#define CHK_PERM 1
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#define CLEAN 0 /* disk and memory copies identical */
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#define DIRTY 1 /* disk and memory copies differ */
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#define ATIME 002 /* set if atime field needs updating */
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#define CTIME 004 /* set if ctime field needs updating */
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#define MTIME 010 /* set if mtime field needs updating */
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#define BYTE_SWAP 0 /* tells conv2/conv4 to swap bytes */
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#define END_OF_FILE (-104) /* eof detected */
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#define SUPER_BLOCK_BYTES (1024) /* bytes offset */
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#define ROOT_INODE ((ino_t) 2) /* inode number for root directory */
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#define BOOT_BLOCK ((block_t) 0) /* block number of boot block */
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#define START_BLOCK ((block_t) 2) /* first block of FS (not counting SB) */
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#define BLOCK_ADDRESS_BYTES 4 /* bytes per address */
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#define SUPER_SIZE usizeof (struct super_block) /* sb size in RAM */
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#define SUPER_SIZE_D (1024) /* max size of superblock stored on disk */
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/* Directories related macroses */
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#define DIR_ENTRY_ALIGN 4
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/* ino + rec_len + name_len + file_type, doesn't include name and padding */
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#define MIN_DIR_ENTRY_SIZE 8
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#define DIR_ENTRY_CONTENTS_SIZE(d) (MIN_DIR_ENTRY_SIZE + (d)->d_name_len)
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/* size with padding */
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#define DIR_ENTRY_ACTUAL_SIZE(d) (DIR_ENTRY_CONTENTS_SIZE(d) + \
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((DIR_ENTRY_CONTENTS_SIZE(d) & 0x03) == 0 ? 0 : \
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DIR_ENTRY_ALIGN - (DIR_ENTRY_CONTENTS_SIZE(d) & 0x03) ))
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/* How many bytes can be taken from the end of dentry */
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#define DIR_ENTRY_SHRINK(d) (conv2(le_CPU, (d)->d_rec_len) \
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- DIR_ENTRY_ACTUAL_SIZE(d))
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/* Dentry can have padding, which can be used to enlarge namelen */
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#define DIR_ENTRY_MAX_NAME_LEN(d) (conv2(le_CPU, (d)->d_rec_len) \
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- MIN_DIR_ENTRY_SIZE)
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/* Constants relative to the data blocks */
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/* When change EXT2_NDIR_BLOCKS, modify ext2_max_size()!!!*/
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#define EXT2_NDIR_BLOCKS 12
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#define EXT2_IND_BLOCK EXT2_NDIR_BLOCKS
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#define EXT2_DIND_BLOCK (EXT2_IND_BLOCK + 1)
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#define EXT2_TIND_BLOCK (EXT2_DIND_BLOCK + 1)
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#define EXT2_N_BLOCKS (EXT2_TIND_BLOCK + 1)
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#define FS_BITMAP_CHUNKS(b) ((b)/usizeof (bitchunk_t))/* # map chunks/blk */
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#define FS_BITCHUNK_BITS (usizeof(bitchunk_t) * CHAR_BIT)
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#define FS_BITS_PER_BLOCK(b) (FS_BITMAP_CHUNKS(b) * FS_BITCHUNK_BITS)
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/* Inodes */
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/* Next 4 following macroses were taken from linux' ext2_fs.h */
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#define EXT2_GOOD_OLD_INODE_SIZE 128
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#define EXT2_GOOD_OLD_FIRST_INO 11
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#define EXT2_INODE_SIZE(s) (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \
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EXT2_GOOD_OLD_INODE_SIZE : \
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(s)->s_inode_size)
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#define EXT2_FIRST_INO(s) (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \
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EXT2_GOOD_OLD_FIRST_INO : \
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(s)->s_first_ino)
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/* Maximum size of a fast symlink including trailing '\0' */
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#define MAX_FAST_SYMLINK_LENGTH \
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( sizeof(((d_inode *)0)->i_block[0]) * EXT2_N_BLOCKS )
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#define NUL(str,l,m) mfs_nul_f(__FILE__,__LINE__,(str), (l), (m))
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/* FS states */
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#define EXT2_VALID_FS 0x0001 /* Cleanly unmounted */
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#define EXT2_ERROR_FS 0x0002 /* Errors detected */
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#define EXT2_GOOD_OLD_REV 0 /* The good old (original) format */
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#define EXT2_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
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/* ext2 features, names shorted (cut EXT2_ prefix) */
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#define COMPAT_DIR_PREALLOC 0x0001
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#define COMPAT_IMAGIC_INODES 0x0002
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#define COMPAT_HAS_JOURNAL 0x0004
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#define COMPAT_EXT_ATTR 0x0008
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#define COMPAT_RESIZE_INO 0x0010
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#define COMPAT_DIR_INDEX 0x0020
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#define COMPAT_ANY 0xffffffff
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#define RO_COMPAT_SPARSE_SUPER 0x0001
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#define RO_COMPAT_LARGE_FILE 0x0002
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#define RO_COMPAT_BTREE_DIR 0x0004
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#define RO_COMPAT_ANY 0xffffffff
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#define INCOMPAT_COMPRESSION 0x0001
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#define INCOMPAT_FILETYPE 0x0002
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#define INCOMPAT_RECOVER 0x0004
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#define INCOMPAT_JOURNAL_DEV 0x0008
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#define INCOMPAT_META_BG 0x0010
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#define INCOMPAT_ANY 0xffffffff
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/* What do we support? */
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#define SUPPORTED_INCOMPAT_FEATURES (INCOMPAT_FILETYPE)
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#define SUPPORTED_RO_COMPAT_FEATURES (RO_COMPAT_SPARSE_SUPER | \
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RO_COMPAT_LARGE_FILE)
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/* Ext2 directory file types. Only the low 3 bits are used.
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* The other bits are reserved for now.
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*/
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#define EXT2_FT_UNKNOWN 0
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#define EXT2_FT_REG_FILE 1
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#define EXT2_FT_DIR 2
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#define EXT2_FT_CHRDEV 3
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#define EXT2_FT_BLKDEV 4
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#define EXT2_FT_FIFO 5
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#define EXT2_FT_SOCK 6
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#define EXT2_FT_SYMLINK 7
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#define EXT2_FT_MAX 8
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#define HAS_COMPAT_FEATURE(sp, mask) \
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( (sp)->s_feature_compat & (mask) )
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#define HAS_RO_COMPAT_FEATURE(sp, mask) \
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( (sp)->s_feature_ro_compat & (mask) )
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#define HAS_INCOMPAT_FEATURE(sp, mask) \
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( (sp)->s_feature_incompat & (mask) )
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/* hash-indexed directory */
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#define EXT2_INDEX_FL 0x00001000
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/* Top of directory hierarchies*/
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#define EXT2_TOPDIR_FL 0x00020000
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#define EXT2_PREALLOC_BLOCKS 8
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#endif /* EXT2_CONST_H */
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