Current Path : /sys/fs/ext2fs/ |
FreeBSD hs32.drive.ne.jp 9.1-RELEASE FreeBSD 9.1-RELEASE #1: Wed Jan 14 12:18:08 JST 2015 root@hs32.drive.ne.jp:/sys/amd64/compile/hs32 amd64 |
Current File : //sys/fs/ext2fs/ext2fs.h |
/*- * modified for EXT2FS support in Lites 1.1 * * Aug 1995, Godmar Back (gback@cs.utah.edu) * University of Utah, Department of Computer Science * * $FreeBSD: release/9.1.0/sys/fs/ext2fs/ext2fs.h 233322 2012-03-22 20:31:52Z pfg $ */ /*- * 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_EXT2FS_H_ #define _FS_EXT2FS_EXT2FS_H_ #include <sys/types.h> /* * Maximal count of links to a file */ #define EXT2_LINK_MAX 32000 /* * A summary of contiguous blocks of various sizes is maintained * in each cylinder group. Normally this is set by the initial * value of fs_maxcontig. * * XXX:FS_MAXCONTIG is set to 16 to conserve space. Here we set * EXT2_MAXCONTIG to 32 for better performance. */ #define EXT2_MAXCONTIG 32 /* * 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 { uint32_t e2fs_icount; /* Inode count */ uint32_t e2fs_bcount; /* blocks count */ uint32_t e2fs_rbcount; /* reserved blocks count */ uint32_t e2fs_fbcount; /* free blocks count */ uint32_t e2fs_ficount; /* free inodes count */ uint32_t e2fs_first_dblock; /* first data block */ uint32_t e2fs_log_bsize; /* block size = 1024*(2^e2fs_log_bsize) */ uint32_t e2fs_log_fsize; /* fragment size */ uint32_t e2fs_bpg; /* blocks per group */ uint32_t e2fs_fpg; /* frags per group */ uint32_t e2fs_ipg; /* inodes per group */ uint32_t e2fs_mtime; /* mount time */ uint32_t e2fs_wtime; /* write time */ uint16_t e2fs_mnt_count; /* mount count */ uint16_t e2fs_max_mnt_count; /* max mount count */ uint16_t e2fs_magic; /* magic number */ uint16_t e2fs_state; /* file system state */ uint16_t e2fs_beh; /* behavior on errors */ uint16_t e2fs_minrev; /* minor revision level */ uint32_t e2fs_lastfsck; /* time of last fsck */ uint32_t e2fs_fsckintv; /* max time between fscks */ uint32_t e2fs_creator; /* creator OS */ uint32_t e2fs_rev; /* revision level */ uint16_t e2fs_ruid; /* default uid for reserved blocks */ uint16_t e2fs_rgid; /* default gid for reserved blocks */ /* EXT2_DYNAMIC_REV superblocks */ uint32_t e2fs_first_ino; /* first non-reserved inode */ uint16_t e2fs_inode_size; /* size of inode structure */ uint16_t e2fs_block_group_nr; /* block grp number of this sblk*/ uint32_t e2fs_features_compat; /* compatible feature set */ uint32_t e2fs_features_incompat; /* incompatible feature set */ uint32_t e2fs_features_rocompat; /* RO-compatible feature set */ uint8_t e2fs_uuid[16]; /* 128-bit uuid for volume */ char e2fs_vname[16]; /* volume name */ char e2fs_fsmnt[64]; /* name mounted on */ uint32_t e2fs_algo; /* For compression */ uint8_t e2fs_prealloc; /* # of blocks for old prealloc */ uint8_t e2fs_dir_prealloc; /* # of blocks for old prealloc dirs */ uint16_t e2fs_reserved_ngdb; /* # of reserved gd blocks for resize */ char e3fs_journal_uuid[16]; /* uuid of journal superblock */ uint32_t e3fs_journal_inum; /* inode number of journal file */ uint32_t e3fs_journal_dev; /* device number of journal file */ uint32_t e3fs_last_orphan; /* start of list of inodes to delete */ uint32_t e3fs_hash_seed[4]; /* HTREE hash seed */ char e3fs_def_hash_version; /* Default hash version to use */ char e3fs_reserved_char_pad; uint32_t e3fs_default_mount_opts; uint32_t e3fs_first_meta_bg; /* First metablock block group */ uint32_t e3fs_mkfs_time; /* when the fs was created */ uint32_t e3fs_jnl_blks[17]; /* backup of the journal inode */ uint32_t e4fs_bcount_hi; /* block count */ uint32_t e4fs_rbcount_hi; /* reserved blocks count */ uint32_t e4fs_fbcount_hi; /* free blocks count */ uint16_t e4fs_min_extra_isize;/* all inodes have at least some bytes */ uint16_t e4fs_want_extra_isize; /* inodes must reserve some bytes */ uint32_t e4fs_flags; /* miscellaneous flags */ uint16_t e4fs_raid_stride; /* RAID stride */ uint16_t e4fs_mmpintv; /* number of seconds to wait in MMP checking */ uint64_t e4fs_mmpblk; /* block for multi-mount protection */ uint32_t e4fs_raid_stripe_wid;/* blocks on all data disks (N * stride) */ uint8_t e4fs_log_gpf; /* FLEX_BG group size */ uint8_t e4fs_char_pad2; uint16_t e4fs_pad; uint32_t reserved2[162]; /* Padding to the end of the block */ }; /* * 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; /* (u) # of contig. allocated dirs */ char e2fs_wasvalid; /* valid at mount time */ off_t e2fs_maxfilesize; struct ext2_gd *e2fs_gd; /* Group Descriptors */ int32_t e2fs_maxcontig; /* max number of contiguous blks */ int32_t e2fs_contigsumsize; /* size of cluster summary array */ int32_t *e2fs_maxcluster; /* max cluster in each cyl group */ struct csum *e2fs_clustersum; /* cluster summary in each cyl group */ }; /* * The second extended file system version */ #define E2FS_DATE "95/08/09" #define E2FS_VERSION "0.5b" /* * The second extended file system magic number */ #define E2FS_MAGIC 0xEF53 /* * 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_HASJOURNAL 0x0004 #define EXT2F_COMPAT_RESIZE 0x0010 #define EXT2F_ROCOMPAT_SPARSESUPER 0x0001 #define EXT2F_ROCOMPAT_LARGEFILE 0x0002 #define EXT2F_ROCOMPAT_BTREE_DIR 0x0004 #define EXT4F_ROCOMPAT_EXTRA_ISIZE 0x0040 #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 | \ EXT4F_ROCOMPAT_EXTRA_ISIZE) #define EXT2F_INCOMPAT_SUPP EXT2F_INCOMPAT_FTYPE /* 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) /* * 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 { uint32_t ext2bgd_b_bitmap; /* blocks bitmap block */ uint32_t ext2bgd_i_bitmap; /* inodes bitmap block */ uint32_t ext2bgd_i_tables; /* inodes table block */ uint16_t ext2bgd_nbfree; /* number of free blocks */ uint16_t ext2bgd_nifree; /* number of free inodes */ uint16_t ext2bgd_ndirs; /* number of directories */ uint16_t reserved; uint32_t reserved2[3]; }; /* cluster summary information */ struct csum { int8_t cs_init; /* cluster summary has been initialized */ int32_t *cs_sum; /* cluster summary array */ }; /* 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_ */