/* $NetBSD: ext2fs.h,v 1.48 2016/08/20 19:47:44 jdolecek Exp $ */ /* * Copyright (c) 1982, 1986, 1993 * The Regents of the University of California. 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. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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. * * @(#)fs.h 8.10 (Berkeley) 10/27/94 * Modified for ext2fs by Manuel Bouyer. */ /* * Copyright (c) 1997 Manuel Bouyer. * * 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 ``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 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. * * @(#)fs.h 8.10 (Berkeley) 10/27/94 * Modified for ext2fs by Manuel Bouyer. */ #ifndef _UFS_EXT2FS_EXT2FS_H_ #define _UFS_EXT2FS_EXT2FS_H_ #include /* * Each disk drive contains some number of file systems. * A file system consists of a number of cylinder groups. * Each cylinder group has inodes and data. * * A file system is described by its super-block, which in turn * describes the cylinder groups. The super-block is critical * data and is replicated in each cylinder group to protect against * catastrophic loss. This is done at `newfs' time and the critical * super-block data does not change, so the copies need not be * referenced further unless disaster strikes. * * The first boot and super blocks are given in absolute disk addresses. * The byte-offset forms are preferred, as they don't imply a sector size. */ #define BBSIZE 1024 #define SBSIZE 1024 #define BBOFF ((off_t)(0)) #define SBOFF ((off_t)(BBOFF + BBSIZE)) #define BBLOCK ((daddr_t)(0)) #define SBLOCK ((daddr_t)(BBLOCK + BBSIZE / DEV_BSIZE)) #define fsbtodb(fs, b) ((daddr_t)(b) << (fs)->e2fs_fsbtodb) /* calculates (loc / fs->fs_bsize) */ #define lblkno(fs, loc) ((loc) >> (fs->e2fs_bshift)) #define blksize(fs, ip, lbn) ((fs)->e2fs_bsize) /* * Addresses stored in inodes are capable of addressing blocks * XXX */ /* * MINBSIZE is the smallest allowable block size. * MINBSIZE must be big enough to hold a cylinder group block, * thus changes to (struct cg) must keep its size within MINBSIZE. * Note that super blocks are always of size SBSIZE, * and that both SBSIZE and MAXBSIZE must be >= MINBSIZE. */ #define LOG_MINBSIZE 10 #define MINBSIZE (1 << LOG_MINBSIZE) /* * 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 /* * MINFREE gives the minimum acceptable percentage of file system * blocks which may be free. If the freelist drops below this level * only the superuser may continue to allocate blocks. This may * be set to 0 if no reserve of free blocks is deemed necessary, * however throughput drops by fifty percent if the file system * is run at between 95% and 100% full; thus the minimum default * value of fs_minfree is 5%. However, to get good clustering * performance, 10% is a better choice. hence we use 10% as our * default value. With 10% free space, fragmentation is not a * problem, so we choose to optimize for time. */ #define MINFREE 5 /* * This is maximum amount of links allowed for files. For directories, * going over this means setting DIR_NLINK feature. */ #define EXT2FS_LINK_MAX 65000 #define EXT2FS_LINK_INF 1 /* link count unknown */ /* * 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; /* bsize = 1024*(2^e2fs_log_bsize) */ uint32_t e2fs_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 to preallocate */ uint8_t e2fs_dir_prealloc; /* # of blocks to preallocate for dir */ uint16_t e2fs_reserved_ngdb; /* # of reserved gd blocks for resize */ /* Additional fields */ 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_jnl_backup_type; uint16_t e3fs_desc_size; /* size of group descriptor */ 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; /* high bits of blocks count */ uint32_t e4fs_rbcount_hi; /* high bits of reserved blocks count */ uint32_t e4fs_fbcount_hi; /* high bits of free blocks count */ uint16_t e4fs_min_extra_isize; /* all inodes have 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; /* seconds to wait in MMP checking */ uint64_t e4fs_mmpblk; /* block for multi-mount protection */ uint32_t e4fs_raid_stripe_wid; /* blocks on data disks (N * stride) */ uint8_t e4fs_log_gpf; /* FLEX_BG group size */ uint8_t e4fs_chksum_type; /* metadata checksum algorithm used */ uint8_t e4fs_encrypt; /* versioning level for encryption */ uint8_t e4fs_reserved_pad; uint64_t e4fs_kbytes_written; /* number of lifetime kilobytes */ uint32_t e4fs_snapinum; /* inode number of active snapshot */ uint32_t e4fs_snapid; /* sequential ID of active snapshot */ uint64_t e4fs_snaprbcount; /* rsvd blocks for active snapshot */ uint32_t e4fs_snaplist; /* inode number for on-disk snapshot */ uint32_t e4fs_errcount; /* number of file system errors */ uint32_t e4fs_first_errtime; /* first time an error happened */ uint32_t e4fs_first_errino; /* inode involved in first error */ uint64_t e4fs_first_errblk; /* block involved of first error */ uint8_t e4fs_first_errfunc[32];/* function where error happened */ uint32_t e4fs_first_errline; /* line number where error happened */ uint32_t e4fs_last_errtime; /* most recent time of an error */ uint32_t e4fs_last_errino; /* inode involved in last error */ uint32_t e4fs_last_errline; /* line number where error happened */ uint64_t e4fs_last_errblk; /* block involved of last error */ uint8_t e4fs_last_errfunc[32];/* function where error happened */ uint8_t e4fs_mount_opts[64]; uint32_t e4fs_usrquota_inum; /* inode for tracking user quota */ uint32_t e4fs_grpquota_inum; /* inode for tracking group quota */ uint32_t e4fs_overhead_clusters;/* overhead blocks/clusters */ uint32_t e4fs_backup_bgs[2]; /* groups with sparse_super2 SBs */ uint8_t e4fs_encrypt_algos[4];/* encryption algorithms in use */ uint8_t e4fs_encrypt_pw_salt[16];/* salt used for string2key */ uint32_t e4fs_lpf_ino; /* location of the lost+found inode */ uint32_t e4fs_proj_quota_inum; /* inode for tracking project quota */ uint32_t e4fs_chksum_seed; /* checksum seed */ uint32_t e4fs_reserved[98]; /* padding to the end of the block */ uint32_t e4fs_sbchksum; /* superblock checksum */ }; /* in-memory data for ext2fs */ struct m_ext2fs { struct ext2fs e2fs; u_char e2fs_fsmnt[MAXMNTLEN]; /* name mounted on */ int8_t e2fs_ronly; /* mounted read-only flag */ int8_t e2fs_fmod; /* super block modified flag */ int8_t e2fs_uhash; /* 3 if hash should be signed, 0 if not */ int32_t e2fs_bsize; /* block size */ int32_t e2fs_bshift; /* ``lblkno'' calc of logical blkno */ int32_t e2fs_bmask; /* ``blkoff'' calc of blk offsets */ int64_t e2fs_qbmask; /* ~fs_bmask - for use with quad size */ int32_t e2fs_fsbtodb; /* fsbtodb and dbtofsb shift constant */ int32_t e2fs_ncg; /* number of cylinder groups */ int32_t e2fs_ngdb; /* number of group descriptor blocks */ int32_t e2fs_ipb; /* number of inodes per block */ int32_t e2fs_itpg; /* number of inode table blocks per group */ struct ext2_gd *e2fs_gd; /* group descriptors (data not byteswapped) */ }; /* * Filesystem identification */ #define E2FS_MAGIC 0xef53 /* the ext2fs magic number */ #define E2FS_REV0 0 /* GOOD_OLD revision */ #define E2FS_REV1 1 /* Support compat/incompat features */ /* compatible/incompatible features */ #define EXT2F_COMPAT_PREALLOC 0x0001 #define EXT2F_COMPAT_AFS 0x0002 #define EXT2F_COMPAT_HASJOURNAL 0x0004 #define EXT2F_COMPAT_EXTATTR 0x0008 #define EXT2F_COMPAT_RESIZE 0x0010 #define EXT2F_COMPAT_DIRHASHINDEX 0x0020 #define EXT2F_COMPAT_SPARSESUPER2 0x0200 #define EXT2F_COMPAT_BITS \ "\20" \ "\12COMPAT_SPARSESUPER2" \ "\11" \ "\10" \ "\07" \ "\06COMPAT_DIRHASHINDEX" \ "\05COMPAT_RESIZE" \ "\04COMPAT_EXTATTR" \ "\03COMPAT_HASJOURNAL" \ "\02COMPAT_AFS" \ "\01COMPAT_PREALLOC" #define EXT2F_ROCOMPAT_SPARSESUPER 0x0001 #define EXT2F_ROCOMPAT_LARGEFILE 0x0002 #define EXT2F_ROCOMPAT_BTREE_DIR 0x0004 #define EXT2F_ROCOMPAT_HUGE_FILE 0x0008 #define EXT2F_ROCOMPAT_GDT_CSUM 0x0010 #define EXT2F_ROCOMPAT_DIR_NLINK 0x0020 #define EXT2F_ROCOMPAT_EXTRA_ISIZE 0x0040 #define EXT2F_ROCOMPAT_QUOTA 0x0100 #define EXT2F_ROCOMPAT_BIGALLOC 0x0200 #define EXT2F_ROCOMPAT_METADATA_CKSUM 0x0400 #define EXT2F_ROCOMPAT_READONLY 0x1000 #define EXT2F_ROCOMPAT_PROJECT 0x2000 #define EXT2F_ROCOMPAT_BITS \ "\20" \ "\16ROCOMPAT_PROJECT" \ "\15ROCOMPAT_READONLY" \ "\14" \ "\13ROCOMPAT_METADATA_CKSUM" \ "\12ROCOMPAT_BIGALLOC" \ "\11ROCOMPAT_QUOTA" \ "\10" \ "\07ROCOMPAT_EXTRA_ISIZE" \ "\06ROCOMPAT_DIR_NLINK" \ "\05ROCOMPAT_GDT_CSUM" \ "\04ROCOMPAT_HUGE_FILE" \ "\03ROCOMPAT_BTREE_DIR" \ "\02ROCOMPAT_LARGEFILE" \ "\01ROCOMPAT_SPARSESUPER" #define EXT2F_INCOMPAT_COMP 0x0001 #define EXT2F_INCOMPAT_FTYPE 0x0002 #define EXT2F_INCOMPAT_REPLAY_JOURNAL 0x0004 #define EXT2F_INCOMPAT_USES_JOURNAL 0x0008 #define EXT2F_INCOMPAT_META_BG 0x0010 #define EXT2F_INCOMPAT_EXTENTS 0x0040 #define EXT2F_INCOMPAT_64BIT 0x0080 #define EXT2F_INCOMPAT_MMP 0x0100 #define EXT2F_INCOMPAT_FLEX_BG 0x0200 #define EXT2F_INCOMPAT_EA_INODE 0x0400 #define EXT2F_INCOMPAT_DIRDATA 0x1000 #define EXT2F_INCOMPAT_CSUM_SEED 0x2000 #define EXT2F_INCOMPAT_LARGEDIR 0x4000 #define EXT2F_INCOMPAT_INLINE_DATA 0x8000 #define EXT2F_INCOMPAT_ENCRYPT 0x10000 #define EXT2F_INCOMPAT_BITS \ "\20" \ "\021INCOMPAT_ENCRYPT" \ "\020INCOMPAT_INLINE_DATA" \ "\017INCOMPAT_LARGEDIR" \ "\016INCOMPAT_CSUM_SEED" \ "\015INCOMPAT_DIRDATA" \ "\014" \ "\013INCOMPAT_EA_INODE" \ "\012INCOMPAT_FLEX_BG" \ "\011INCOMPAT_MMP" \ "\010INCOMPAT_64BIT" \ "\07INCOMPAT_EXTENTS" \ "\05INCOMPAT_META_BG" \ "\04INCOMPAT_USES_JOURNAL" \ "\03INCOMPAT_REPLAY_JOURNAL" \ "\02INCOMPAT_FTYPE" \ "\01INCOMPAT_COMP" /* * Features supported in this implementation * * We support the following REV1 features: * - EXT2F_ROCOMPAT_SPARSESUPER * superblock backups stored only in cg_has_sb(bno) groups * - EXT2F_ROCOMPAT_LARGEFILE * use e2di_size_high in struct ext2fs_dinode to store * upper 32bit of size for >2GB files * - EXT2F_INCOMPAT_FTYPE * store file type to e2d_type in struct ext2fs_direct * (on REV0 e2d_namlen is uint16_t and no e2d_type, like ffs) */ #define EXT2F_COMPAT_SUPP 0x0000 #define EXT2F_ROCOMPAT_SUPP (EXT2F_ROCOMPAT_SPARSESUPER \ | EXT2F_ROCOMPAT_LARGEFILE \ | EXT2F_ROCOMPAT_HUGE_FILE \ | EXT2F_ROCOMPAT_EXTRA_ISIZE \ | EXT2F_ROCOMPAT_DIR_NLINK \ | EXT2F_ROCOMPAT_GDT_CSUM) #define EXT2F_INCOMPAT_SUPP (EXT2F_INCOMPAT_FTYPE \ | EXT2F_INCOMPAT_EXTENTS \ | EXT2F_INCOMPAT_FLEX_BG) /* * Feature set definitions */ #define EXT2F_HAS_COMPAT_FEATURE(fs, feature) \ ((fs)->e2fs.e2fs_rev >= E2FS_REV1 && \ ((fs)->e2fs.e2fs_features_compat & (feature)) != 0) #define EXT2F_HAS_ROCOMPAT_FEATURE(fs, feature) \ ((fs)->e2fs.e2fs_rev >= E2FS_REV1 && \ ((fs)->e2fs.e2fs_features_rocompat & (feature)) != 0) #define EXT2F_HAS_INCOMPAT_FEATURE(fs, feature) \ ((fs)->e2fs.e2fs_rev >= E2FS_REV1 && \ ((fs)->e2fs.e2fs_features_incompat & (feature)) != 0) /* * 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 /* * Filesystem clean flags */ #define E2FS_ISCLEAN 0x01 #define E2FS_ERRORS 0x02 /* 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; /* first 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 */ /* * Following only valid when either GDT_CSUM (AKA uninit_bg) * or METADATA_CKSUM feature is on */ uint16_t ext2bgd_flags; /* ext4 bg flags (INODE_UNINIT, ...)*/ uint32_t ext2bgd_exclude_bitmap_lo; /* snapshot exclude bitmap */ uint16_t ext2bgd_block_bitmap_csum_lo; /* Low block bitmap checksum */ uint16_t ext2bgd_inode_bitmap_csum_lo; /* Low inode bitmap checksum */ uint16_t ext2bgd_itable_unused_lo; /* Low unused inode offset */ uint16_t ext2bgd_checksum; /* Group desc checksum */ /* * XXX disk32 Further fields only exist if 64BIT feature is on * and superblock desc_size > 32, not supported for now. */ }; #define E2FS_BG_INODE_UNINIT 0x0001 /* Inode bitmap not used/initialized */ #define E2FS_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not used/initialized */ #define E2FS_BG_INODE_ZEROED 0x0004 /* On-disk inode table initialized */ #define E2FS_HAS_GD_CSUM(fs) \ EXT2F_HAS_ROCOMPAT_FEATURE(fs, EXT2F_ROCOMPAT_GDT_CSUM|EXT2F_ROCOMPAT_METADATA_CKSUM) != 0 /* * If the EXT2F_ROCOMPAT_SPARSESUPER flag is set, the cylinder group has a * copy of the super and cylinder group descriptors blocks only if it's * 1, a power of 3, 5 or 7 */ static __inline int cg_has_sb(int) __unused; static __inline int cg_has_sb(int i) { int a3, a5, a7; if (i == 0 || i == 1) return 1; for (a3 = 3, a5 = 5, a7 = 7; a3 <= i || a5 <= i || a7 <= i; a3 *= 3, a5 *= 5, a7 *= 7) if (i == a3 || i == a5 || i == a7) return 1; return 0; } /* EXT2FS metadatas are stored in little-endian byte order. These macros * helps reading theses metadatas */ #if BYTE_ORDER == LITTLE_ENDIAN # define h2fs16(x) (x) # define h2fs32(x) (x) # define h2fs64(x) (x) # define fs2h16(x) (x) # define fs2h32(x) (x) # define fs2h64(x) (x) # define e2fs_sbload(old, new) memcpy((new), (old), SBSIZE) # define e2fs_sbsave(old, new) memcpy((new), (old), SBSIZE) #else void e2fs_sb_bswap(struct ext2fs *, struct ext2fs *); # define h2fs16(x) bswap16(x) # define h2fs32(x) bswap32(x) # define h2fs64(x) bswap64(x) # define fs2h16(x) bswap16(x) # define fs2h32(x) bswap32(x) # define fs2h64(x) bswap64(x) # define e2fs_sbload(old, new) e2fs_sb_bswap((old), (new)) # define e2fs_sbsave(old, new) e2fs_sb_bswap((old), (new)) #endif /* Group descriptors are not byte swapped */ #define e2fs_cgload(old, new, size) memcpy((new), (old), (size)) #define e2fs_cgsave(old, new, size) memcpy((new), (old), (size)) /* * Turn file system block numbers into disk block addresses. * This maps file system blocks to device size blocks. */ #define EXT2_FSBTODB(fs, b) ((b) << (fs)->e2fs_fsbtodb) #define EXT2_DBTOFSB(fs, b) ((b) >> (fs)->e2fs_fsbtodb) /* * Macros for handling inode numbers: * inode number to file system block offset. * inode number to cylinder group number. * inode number to file system block address. */ #define ino_to_cg(fs, x) (((x) - 1) / (fs)->e2fs.e2fs_ipg) #define ino_to_fsba(fs, x) \ (fs2h32((fs)->e2fs_gd[ino_to_cg((fs), (x))].ext2bgd_i_tables) + \ (((x) - 1) % (fs)->e2fs.e2fs_ipg) / (fs)->e2fs_ipb) #define ino_to_fsbo(fs, x) (((x) - 1) % (fs)->e2fs_ipb) /* * Give cylinder group number for a file system block. * Give cylinder group block number for a file system block. */ #define dtog(fs, d) (((d) - (fs)->e2fs.e2fs_first_dblock) / (fs)->e2fs.e2fs_fpg) #define dtogd(fs, d) \ (((d) - (fs)->e2fs.e2fs_first_dblock) % (fs)->e2fs.e2fs_fpg) /* * The following macros optimize certain frequently calculated * quantities by using shifts and masks in place of divisions * modulos and multiplications. */ #define ext2_blkoff(fs, loc) /* calculates (loc % fs->e2fs_bsize) */ \ ((loc) & (fs)->e2fs_qbmask) #define ext2_lblktosize(fs, blk) /* calculates (blk * fs->e2fs_bsize) */ \ ((blk) << (fs)->e2fs_bshift) #define ext2_lblkno(fs, loc) /* calculates (loc / fs->e2fs_bsize) */ \ ((loc) >> (fs)->e2fs_bshift) #define ext2_blkroundup(fs, size) /* calculates roundup(size, fs->e2fs_bsize) */ \ (((size) + (fs)->e2fs_qbmask) & (fs)->e2fs_bmask) #define ext2_fragroundup(fs, size) /* calculates roundup(size, fs->e2fs_bsize) */ \ (((size) + (fs)->e2fs_qbmask) & (fs)->e2fs_bmask) /* * Determine the number of available frags given a * percentage to hold in reserve. */ #define freespace(fs) \ ((fs)->e2fs.e2fs_fbcount - (fs)->e2fs.e2fs_rbcount) /* * Number of indirects in a file system block. */ #define EXT2_NINDIR(fs) ((fs)->e2fs_bsize / sizeof(uint32_t)) #endif /* !_UFS_EXT2FS_EXT2FS_H_ */