/*- * modified for EXT2FS support in Lites 1.1 * * Aug 1995, Godmar Back (gback@cs.utah.edu) * University of Utah, Department of Computer Science * * $FreeBSD$ */ /*- * Copyright (c) 2009 Aditya Sarawgi * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * */ #ifndef _FS_EXT2FS_EXT2_FS_H #define _FS_EXT2FS_EXT2_FS_H #include /* * Special inode numbers */ #define EXT2_BAD_INO 1 /* Bad blocks inode */ #define EXT2_ROOT_INO 2 /* Root inode */ #define EXT2_BOOT_LOADER_INO 5 /* Boot loader inode */ #define EXT2_UNDEL_DIR_INO 6 /* Undelete directory inode */ /* First non-reserved inode for old ext2 filesystems */ #define E2FS_REV0_FIRST_INO 11 /* * The second extended file system magic number */ #define E2FS_MAGIC 0xEF53 #if defined(_KERNEL) /* * FreeBSD passes the pointer to the in-core struct with relevant * fields to EXT2_SB macro when accessing superblock fields. */ #define EXT2_SB(sb) (sb) #else /* Assume that user mode programs are passing in an ext2fs superblock, not * a kernel struct super_block. This will allow us to call the feature-test * macros from user land. */ #define EXT2_SB(sb) (sb) #endif /* * Maximal count of links to a file */ #define EXT2_LINK_MAX 32000 /* * Constants relative to the data blocks */ #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 EXT2_MAXSYMLINKLEN (EXT2_N_BLOCKS * sizeof (uint32_t)) /* * The path name on which the file system is mounted is maintained * in fs_fsmnt. MAXMNTLEN defines the amount of space allocated in * the super block for this name. */ #define MAXMNTLEN 512 /* * Super block for an ext2fs file system. */ struct ext2fs { u_int32_t e2fs_icount; /* Inode count */ u_int32_t e2fs_bcount; /* blocks count */ u_int32_t e2fs_rbcount; /* reserved blocks count */ u_int32_t e2fs_fbcount; /* free blocks count */ u_int32_t e2fs_ficount; /* free inodes count */ u_int32_t e2fs_first_dblock; /* first data block */ u_int32_t e2fs_log_bsize; /* block size = 1024*(2^e2fs_log_bsize) */ u_int32_t e2fs_log_fsize; /* fragment size */ u_int32_t e2fs_bpg; /* blocks per group */ u_int32_t e2fs_fpg; /* frags per group */ u_int32_t e2fs_ipg; /* inodes per group */ u_int32_t e2fs_mtime; /* mount time */ u_int32_t e2fs_wtime; /* write time */ u_int16_t e2fs_mnt_count; /* mount count */ u_int16_t e2fs_max_mnt_count; /* max mount count */ u_int16_t e2fs_magic; /* magic number */ u_int16_t e2fs_state; /* file system state */ u_int16_t e2fs_beh; /* behavior on errors */ u_int16_t e2fs_minrev; /* minor revision level */ u_int32_t e2fs_lastfsck; /* time of last fsck */ u_int32_t e2fs_fsckintv; /* max time between fscks */ u_int32_t e2fs_creator; /* creator OS */ u_int32_t e2fs_rev; /* revision level */ u_int16_t e2fs_ruid; /* default uid for reserved blocks */ u_int16_t e2fs_rgid; /* default gid for reserved blocks */ /* EXT2_DYNAMIC_REV superblocks */ u_int32_t e2fs_first_ino; /* first non-reserved inode */ u_int16_t e2fs_inode_size; /* size of inode structure */ u_int16_t e2fs_block_group_nr; /* block grp number of this sblk*/ u_int32_t e2fs_features_compat; /* compatible feature set */ u_int32_t e2fs_features_incompat; /* incompatible feature set */ u_int32_t e2fs_features_rocompat; /* RO-compatible feature set */ u_int8_t e2fs_uuid[16]; /* 128-bit uuid for volume */ char e2fs_vname[16]; /* volume name */ char e2fs_fsmnt[64]; /* name mounted on */ u_int32_t e2fs_algo; /* For comcate for dir */ u_int16_t e2fs_reserved_ngdb; /* # of reserved gd blocks for resize */ u_int32_t reserved2[204]; }; /* Assume that user mode programs are passing in an ext2fs superblock, not * a kernel struct super_block. This will allow us to call the feature-test * macros from user land. */ #define EXT2_SB(sb) (sb) /* * In-Memory Superblock */ struct m_ext2fs { struct ext2fs * e2fs; char e2fs_fsmnt[MAXMNTLEN];/* name mounted on */ char e2fs_ronly; /* mounted read-only flag */ char e2fs_fmod; /* super block modified flag */ uint32_t e2fs_bsize; /* Block size */ uint32_t e2fs_bshift; /* calc of logical block no */ int32_t e2fs_bmask; /* calc of block offset */ int32_t e2fs_bpg; /* Number of blocks per group */ int64_t e2fs_qbmask; /* = s_blocksize -1 */ uint32_t e2fs_fsbtodb; /* Shift to get disk block */ uint32_t e2fs_ipg; /* Number of inodes per group */ uint32_t e2fs_ipb; /* Number of inodes per block */ uint32_t e2fs_itpg; /* Number of inode table per group */ uint32_t e2fs_fsize; /* Size of fragments per block */ uint32_t e2fs_fpb; /* Number of fragments per block */ uint32_t e2fs_fpg; /* Number of fragments per group */ uint32_t e2fs_dbpg; /* Number of descriptor blocks per group */ uint32_t e2fs_descpb; /* Number of group descriptors per block */ uint32_t e2fs_gdbcount; /* Number of group descriptors */ uint32_t e2fs_gcount; /* Number of groups */ uint32_t e2fs_first_inode;/* First inode on fs */ int32_t e2fs_isize; /* Size of inode */ uint32_t e2fs_mount_opt; uint32_t e2fs_blocksize_bits; uint32_t e2fs_total_dir; /* Total number of directories */ uint8_t *e2fs_contigdirs; char e2fs_wasvalid; /* valid at mount time */ off_t e2fs_maxfilesize; struct ext2_gd *e2fs_gd; /* Group Descriptors */ }; /* * The second extended file system version */ #define E2FS_DATE "95/08/09" #define E2FS_VERSION "0.5b" /* * Revision levels */ #define E2FS_REV0 0 /* The good old (original) format */ #define E2FS_REV1 1 /* V2 format w/ dynamic inode sizes */ #define E2FS_CURRENT_REV E2FS_REV0 #define E2FS_MAX_SUPP_REV E2FS_REV1 #define E2FS_REV0_INODE_SIZE 128 /* * compatible/incompatible features */ #define EXT2F_COMPAT_PREALLOC 0x0001 #define EXT2F_COMPAT_RESIZE 0x0010 #define EXT2F_ROCOMPAT_SPARSESUPER 0x0001 #define EXT2F_ROCOMPAT_LARGEFILE 0x0002 #define EXT2F_ROCOMPAT_BTREE_DIR 0x0004 #define EXT2F_INCOMPAT_COMP 0x0001 #define EXT2F_INCOMPAT_FTYPE 0x0002 /* * Features supported in this implementation * * We support the following REV1 features: * - EXT2F_ROCOMPAT_SPARSESUPER * - EXT2F_ROCOMPAT_LARGEFILE * - EXT2F_INCOMPAT_FTYPE */ #define EXT2F_COMPAT_SUPP 0x0000 #define EXT2F_ROCOMPAT_SUPP (EXT2F_ROCOMPAT_SPARSESUPER \ | EXT2F_ROCOMPAT_LARGEFILE) #define EXT2F_INCOMPAT_SUPP EXT2F_INCOMPAT_FTYPE /* * Feature set definitions */ #define EXT2_HAS_COMPAT_FEATURE(sb,mask) \ ( EXT2_SB(sb)->e2fs->e2fs_features_compat & htole32(mask) ) #define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask) \ ( EXT2_SB(sb)->e2fs->e2fs_features_rocompat & htole32(mask) ) #define EXT2_HAS_INCOMPAT_FEATURE(sb,mask) \ ( EXT2_SB(sb)->e2fs->e2fs_features_incompat & htole32(mask) ) /* * Definitions of behavior on errors */ #define E2FS_BEH_CONTINUE 1 /* continue operation */ #define E2FS_BEH_READONLY 2 /* remount fs read only */ #define E2FS_BEH_PANIC 3 /* cause panic */ #define E2FS_BEH_DEFAULT E2FS_BEH_CONTINUE /* * OS identification */ #define E2FS_OS_LINUX 0 #define E2FS_OS_HURD 1 #define E2FS_OS_MASIX 2 #define E2FS_OS_FREEBSD 3 #define E2FS_OS_LITES 4 /* * File clean flags */ #define E2FS_ISCLEAN 0x0001 /* Unmounted cleanly */ #define E2FS_ERRORS 0x0002 /* Errors detected */ /* ext2 file system block group descriptor */ struct ext2_gd { u_int32_t ext2bgd_b_bitmap; /* blocks bitmap block */ u_int32_t ext2bgd_i_bitmap; /* inodes bitmap block */ u_int32_t ext2bgd_i_tables; /* inodes table block */ u_int16_t ext2bgd_nbfree; /* number of free blocks */ u_int16_t ext2bgd_nifree; /* number of free inodes */ u_int16_t ext2bgd_ndirs; /* number of directories */ u_int16_t reserved; u_int32_t reserved2[3]; }; /* EXT2FS metadatas are stored in little-endian byte order. These macros * helps reading these metadatas */ #define e2fs_cgload(old, new, size) memcpy((new), (old), (size)); #define e2fs_cgsave(old, new, size) memcpy((new), (old), (size)); /* * Macro-instructions used to manage several block sizes */ #define EXT2_MIN_BLOCK_SIZE 1024 #define EXT2_MAX_BLOCK_SIZE 4096 #define EXT2_MIN_BLOCK_LOG_SIZE 10 #if defined(_KERNEL) # define EXT2_BLOCK_SIZE(s) ((s)->e2fs_bsize) #else # define EXT2_BLOCK_SIZE(s) (EXT2_MIN_BLOCK_SIZE << (s)->e2fs_log_bsize) #endif #define EXT2_ADDR_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (uint32_t)) #if defined(_KERNEL) # define EXT2_BLOCK_SIZE_BITS(s) ((s)->e2fs_blocksize_bits) #else # define EXT2_BLOCK_SIZE_BITS(s) ((s)->e2fs_log_bsize + 10) #endif #if defined(_KERNEL) #define EXT2_ADDR_PER_BLOCK_BITS(s) (EXT2_SB(s)->s_addr_per_block_bits) #define EXT2_INODE_SIZE(s) (EXT2_SB(s)->e2fs_isize) #define EXT2_FIRST_INO(s) (EXT2_SB(s)->e2fs_first_inode) #else #define EXT2_INODE_SIZE(s) (((s)->s_rev_level == E2FS_REV0) ? \ E2FS_REV0 : (s)->s_inode_size) #define EXT2_FIRST_INO(s) (((s)->s_rev_level == E2FS_REV0) ? \ E2FS_REV0 : (s)->e2fs_first_ino) #endif /* * Macro-instructions used to manage fragments */ #define EXT2_MIN_FRAG_SIZE 1024 #define EXT2_MAX_FRAG_SIZE 4096 #define EXT2_MIN_FRAG_LOG_SIZE 10 #if defined(_KERNEL) # define EXT2_FRAG_SIZE(s) (EXT2_SB(s)->e2fs_fsize) # define EXT2_FRAGS_PER_BLOCK(s) (EXT2_SB(s)->e2fs_fpb) #else # define EXT2_FRAG_SIZE(s) (EXT2_MIN_FRAG_SIZE << (s)->e2fs_log_fsize) # define EXT2_FRAGS_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / EXT2_FRAG_SIZE(s)) #endif /* * Macro-instructions used to manage group descriptors */ #if defined(_KERNEL) # define EXT2_BLOCKS_PER_GROUP(s) (EXT2_SB(s)->e2fs_bpg) # define EXT2_DESC_PER_BLOCK(s) (EXT2_SB(s)->e2fs_descpb) # define EXT2_DESC_PER_BLOCK_BITS(s) (EXT2_SB(s)->s_desc_per_block_bits) #else # define EXT2_BLOCKS_PER_GROUP(s) ((s)->e2fs_bpg) # define EXT2_DESC_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_gd)) #endif #endif /* !_FS_EXT2FS_EXT2FS_H */