331 lines
9.1 KiB
C
331 lines
9.1 KiB
C
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/*
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* modified for EXT2FS support in Lites 1.1
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*
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* Aug 1995, Godmar Back (gback@cs.utah.edu)
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* University of Utah, Department of Computer Science
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*/
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/*
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* linux/include/linux/ext2_fs.h
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*
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* Copyright (C) 1992, 1993, 1994, 1995
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* Remy Card (card@masi.ibp.fr)
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* Laboratoire MASI - Institut Blaise Pascal
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* Universite Pierre et Marie Curie (Paris VI)
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*
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* from
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*
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* linux/include/linux/minix_fs.h
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*
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* Copyright (C) 1991, 1992 Linus Torvalds
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*/
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#ifndef _LINUX_EXT2_FS_H
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#define _LINUX_EXT2_FS_H
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#include <sys/types.h>
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#define __u32 u_int32_t
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#define u32 u_int32_t
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#define __u16 u_int16_t
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#define __u8 u_int8_t
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#define __s32 int32_t
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#define __s16 int16_t
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#define __s8 int8_t
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#define umode_t mode_t
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#define loff_t off_t
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/* the Linux implementation of EXT2 stores some information about
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* an inode in a ext2_inode_info structure which is part of the incore
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* inode in Linux
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* I decided to use the i_spare[11] fields instead - we'll see how this
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* works out
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*/
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#define i_block_group i_spare[0]
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#define i_next_alloc_block i_spare[1]
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#define i_next_alloc_goal i_spare[2]
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#define i_prealloc_block i_spare[3]
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#define i_prealloc_count i_spare[4]
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/*
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* The second extended filesystem constants/structures
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*/
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/*
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* Define EXT2FS_DEBUG to produce debug messages
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*/
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#undef EXT2FS_DEBUG
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/*
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* Define EXT2FS_DEBUG_CACHE to produce cache debug messages
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*/
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#undef EXT2FS_DEBUG_CACHE
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/*
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* Define EXT2FS_CHECK_CACHE to add some checks to the name cache code
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*/
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#undef EXT2FS_CHECK_CACHE
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/*
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* Define EXT2FS_PRE_02B_COMPAT to convert ext 2 fs prior to 0.2b
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*/
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#undef EXT2FS_PRE_02B_COMPAT
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/*
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* Define EXT2_PREALLOCATE to preallocate data blocks for expanding files
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*/
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#define EXT2_PREALLOCATE
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/*
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* The second extended file system version
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*/
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#define EXT2FS_DATE "95/03/19"
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#define EXT2FS_VERSION "0.5a"
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/*
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* Debug code
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*/
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#ifdef EXT2FS_DEBUG
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# define ext2_debug(f, a...) { \
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printf ("EXT2-fs DEBUG (%s, %d): %s:", \
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__FILE__, __LINE__, __FUNCTION__); \
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printf (f, ## a); \
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}
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#else
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# define ext2_debug(f, a...) /**/
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#endif
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/*
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* Special inodes numbers
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*/
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#define EXT2_BAD_INO 1 /* Bad blocks inode */
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#define EXT2_ROOT_INO 2 /* Root inode */
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#define EXT2_ACL_IDX_INO 3 /* ACL inode */
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#define EXT2_ACL_DATA_INO 4 /* ACL inode */
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#define EXT2_BOOT_LOADER_INO 5 /* Boot loader inode */
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#define EXT2_UNDEL_DIR_INO 6 /* Undelete directory inode */
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#define EXT2_FIRST_INO 11 /* First non reserved inode */
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/*
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* The second extended file system magic number
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*/
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#define EXT2_PRE_02B_MAGIC 0xEF51
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#define EXT2_SUPER_MAGIC 0xEF53
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/*
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* Maximal count of links to a file
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*/
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#define EXT2_LINK_MAX 32000
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/*
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* Macro-instructions used to manage several block sizes
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*/
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#define EXT2_MIN_BLOCK_SIZE 1024
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#define EXT2_MAX_BLOCK_SIZE 4096
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#define EXT2_MIN_BLOCK_LOG_SIZE 10
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#define EXT2_BLOCK_SIZE(s) ((s)->s_blocksize)
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#define EXT2_ACLE_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / \
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sizeof (struct ext2_acl_entry))
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#define EXT2_ADDR_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (__u32))
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#define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
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#define EXT2_INODE_SIZE 128
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/* ought to be sizeof (struct ext2_inode)) */
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#define EXT2_INODES_PER_BLOCK(s) ((s)->s_inodes_per_block)
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/*
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* Macro-instructions used to manage fragments
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*/
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#define EXT2_MIN_FRAG_SIZE 1024
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#define EXT2_MAX_FRAG_SIZE 4096
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#define EXT2_MIN_FRAG_LOG_SIZE 10
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#define EXT2_FRAG_SIZE(s) ((s)->s_frag_size)
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#define EXT2_FRAGS_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / EXT2_FRAG_SIZE(s))
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/*
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* ACL structures
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*/
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struct ext2_acl_header /* Header of Access Control Lists */
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{
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__u32 aclh_size;
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__u32 aclh_file_count;
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__u32 aclh_acle_count;
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__u32 aclh_first_acle;
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};
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struct ext2_acl_entry /* Access Control List Entry */
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{
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__u32 acle_size;
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__u16 acle_perms; /* Access permissions */
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__u16 acle_type; /* Type of entry */
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__u16 acle_tag; /* User or group identity */
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__u16 acle_pad1;
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__u32 acle_next; /* Pointer on next entry for the */
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/* same inode or on next free entry */
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};
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/*
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* Structure of a blocks group descriptor
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*/
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struct ext2_old_group_desc
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{
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__u32 bg_block_bitmap; /* Blocks bitmap block */
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__u32 bg_inode_bitmap; /* Inodes bitmap block */
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__u32 bg_inode_table; /* Inodes table block */
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__u16 bg_free_blocks_count; /* Free blocks count */
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__u16 bg_free_inodes_count; /* Free inodes count */
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};
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struct ext2_group_desc
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{
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__u32 bg_block_bitmap; /* Blocks bitmap block */
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__u32 bg_inode_bitmap; /* Inodes bitmap block */
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__u32 bg_inode_table; /* Inodes table block */
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__u16 bg_free_blocks_count; /* Free blocks count */
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__u16 bg_free_inodes_count; /* Free inodes count */
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__u16 bg_used_dirs_count; /* Directories count */
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__u16 bg_pad;
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__u32 bg_reserved[3];
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};
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/*
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* Macro-instructions used to manage group descriptors
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*/
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#define EXT2_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
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#define EXT2_DESC_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_group_desc))
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#define EXT2_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
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/*
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* Constants relative to the data blocks
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*/
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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 EXT2_MAXSYMLINKLEN (EXT2_N_BLOCKS * sizeof (__u32))
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/*
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* Inode flags
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*/
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#define EXT2_SECRM_FL 0x00000001 /* Secure deletion */
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#define EXT2_UNRM_FL 0x00000002 /* Undelete */
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#define EXT2_COMPR_FL 0x00000004 /* Compress file */
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#define EXT2_SYNC_FL 0x00000008 /* Synchronous updates */
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#define EXT2_IMMUTABLE_FL 0x00000010 /* Immutable file */
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#define EXT2_APPEND_FL 0x00000020 /* writes to file may only append */
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#define EXT2_NODUMP_FL 0x00000040 /* do not dump file */
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/*
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* ioctl commands
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*/
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#define EXT2_IOC_GETFLAGS _IOR('f', 1, long)
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#define EXT2_IOC_SETFLAGS _IOW('f', 2, long)
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#define EXT2_IOC_GETVERSION _IOR('v', 1, long)
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#define EXT2_IOC_SETVERSION _IOW('v', 2, long)
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/*
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* File system states
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*/
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#define EXT2_VALID_FS 0x0001 /* Unmounted cleanly */
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#define EXT2_ERROR_FS 0x0002 /* Errors detected */
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/*
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* Mount flags
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*/
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#define EXT2_MOUNT_CHECK_NORMAL 0x0001 /* Do some more checks */
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#define EXT2_MOUNT_CHECK_STRICT 0x0002 /* Do again more checks */
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#define EXT2_MOUNT_CHECK (EXT2_MOUNT_CHECK_NORMAL | \
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EXT2_MOUNT_CHECK_STRICT)
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#define EXT2_MOUNT_GRPID 0x0004 /* Create files with directory's group */
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#define EXT2_MOUNT_DEBUG 0x0008 /* Some debugging messages */
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#define EXT2_MOUNT_ERRORS_CONT 0x0010 /* Continue on errors */
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#define EXT2_MOUNT_ERRORS_RO 0x0020 /* Remount fs ro on errors */
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#define EXT2_MOUNT_ERRORS_PANIC 0x0040 /* Panic on errors */
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#define EXT2_MOUNT_MINIX_DF 0x0080 /* Mimics the Minix statfs */
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#define clear_opt(o, opt) o &= ~EXT2_MOUNT_##opt
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#define set_opt(o, opt) o |= EXT2_MOUNT_##opt
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#define test_opt(sb, opt) ((sb)->u.ext2_sb.s_mount_opt & \
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EXT2_MOUNT_##opt)
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/*
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* Maximal mount counts between two filesystem checks
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*/
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#define EXT2_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
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#define EXT2_DFL_CHECKINTERVAL 0 /* Don't use interval check */
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/*
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* Behaviour when detecting errors
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*/
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#define EXT2_ERRORS_CONTINUE 1 /* Continue execution */
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#define EXT2_ERRORS_RO 2 /* Remount fs read-only */
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#define EXT2_ERRORS_PANIC 3 /* Panic */
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#define EXT2_ERRORS_DEFAULT EXT2_ERRORS_CONTINUE
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/*
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* Structure of the super block
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*/
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struct ext2_super_block {
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__u32 s_inodes_count; /* Inodes count */
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__u32 s_blocks_count; /* Blocks count */
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__u32 s_r_blocks_count; /* Reserved blocks count */
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__u32 s_free_blocks_count; /* Free blocks count */
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__u32 s_free_inodes_count; /* Free inodes count */
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__u32 s_first_data_block; /* First Data Block */
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__u32 s_log_block_size; /* Block size */
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__s32 s_log_frag_size; /* Fragment size */
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__u32 s_blocks_per_group; /* # Blocks per group */
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__u32 s_frags_per_group; /* # Fragments per group */
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__u32 s_inodes_per_group; /* # Inodes per group */
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__u32 s_mtime; /* Mount time */
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__u32 s_wtime; /* Write time */
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__u16 s_mnt_count; /* Mount count */
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__s16 s_max_mnt_count; /* Maximal mount count */
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__u16 s_magic; /* Magic signature */
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__u16 s_state; /* File system state */
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__u16 s_errors; /* Behaviour when detecting errors */
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__u16 s_pad;
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__u32 s_lastcheck; /* time of last check */
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__u32 s_checkinterval; /* max. time between checks */
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__u32 s_creator_os; /* OS */
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__u32 s_rev_level; /* Revision level */
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__u16 s_def_resuid; /* Default uid for reserved blocks */
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__u16 s_def_resgid; /* Default gid for reserved blocks */
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__u32 s_reserved[235]; /* Padding to the end of the block */
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};
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#define EXT2_OS_LINUX 0
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#define EXT2_OS_HURD 1
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#define EXT2_OS_MASIX 2
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#define EXT2_CURRENT_REV 0
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#define EXT2_DEF_RESUID 0
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#define EXT2_DEF_RESGID 0
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/*
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* Structure of a directory entry
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*/
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#define EXT2_NAME_LEN 255
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struct ext2_dir_entry {
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__u32 inode; /* Inode number */
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__u16 rec_len; /* Directory entry length */
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__u16 name_len; /* Name length */
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char name[EXT2_NAME_LEN]; /* File name */
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};
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/*
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* EXT2_DIR_PAD defines the directory entries boundaries
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*
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* NOTE: It must be a multiple of 4
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*/
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#define EXT2_DIR_PAD 4
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#define EXT2_DIR_ROUND (EXT2_DIR_PAD - 1)
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#define EXT2_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT2_DIR_ROUND) & \
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~EXT2_DIR_ROUND)
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#endif /* _LINUX_EXT2_FS_H */
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