1 /* $OpenBSD: ext2fs.h,v 1.27 2024/07/15 13:27:36 martijn Exp $ */ 2 /* $NetBSD: ext2fs.h,v 1.10 2000/01/28 16:00:23 bouyer Exp $ */ 3 4 /* 5 * Copyright (c) 1997 Manuel Bouyer. 6 * Copyright (c) 1982, 1986, 1993 7 * The Regents of the University of California. All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)fs.h 8.10 (Berkeley) 10/27/94 34 * Modified for ext2fs by Manuel Bouyer. 35 */ 36 37 #include <sys/endian.h> 38 39 /* 40 * Each disk drive contains some number of file systems. 41 * A file system consists of a number of cylinder groups. 42 * Each cylinder group has inodes and data. 43 * 44 * A file system is described by its super-block, which in turn 45 * describes the cylinder groups. The super-block is critical 46 * data and is replicated in each cylinder group to protect against 47 * catastrophic loss. This is done at `newfs' time and the critical 48 * super-block data does not change, so the copies need not be 49 * referenced further unless disaster strikes. 50 * 51 * The first boot and super blocks are given in absolute disk addresses. 52 * The byte-offset forms are preferred, as they don't imply a sector size. 53 */ 54 #define BBSIZE 1024 55 #define SBSIZE 1024 56 #define BBOFF ((off_t)(0)) 57 #define SBOFF ((off_t)(BBOFF + BBSIZE)) 58 #define BBLOCK ((daddr_t)(0)) 59 #define SBLOCK ((daddr_t)(BBLOCK + BBSIZE / DEV_BSIZE)) 60 61 /* 62 * Inodes are, like in UFS, 32-bit unsigned integers and therefore ufsino_t. 63 * Disk blocks are 32-bit, if the filesystem isn't operating in 64-bit mode 64 * (the incompatible ext4 64BIT flag). More work is needed to properly use 65 * daddr_t as the disk block data type on both BE and LE architectures. 66 * XXX disk blocks are simply u_int32_t for now. 67 */ 68 69 /* 70 * MINBSIZE is the smallest allowable block size. 71 * MINBSIZE must be big enough to hold a cylinder group block, 72 * thus changes to (struct cg) must keep its size within MINBSIZE. 73 * Note that super blocks are always of size SBSIZE, 74 * and that both SBSIZE and MAXBSIZE must be >= MINBSIZE. 75 * FSIZE means fragment size. 76 */ 77 #define LOG_MINBSIZE 10 78 #define MINBSIZE (1 << LOG_MINBSIZE) 79 #define LOG_MINFSIZE 10 80 #define MINFSIZE (1 << LOG_MINFSIZE) 81 82 /* 83 * The path name on which the file system is mounted is maintained 84 * in fs_fsmnt. MAXMNTLEN defines the amount of space allocated in 85 * the super block for this name. 86 */ 87 #define MAXMNTLEN 512 88 89 /* 90 * MINFREE gives the minimum acceptable percentage of file system 91 * blocks which may be free. If the freelist drops below this level 92 * only the superuser may continue to allocate blocks. This may 93 * be set to 0 if no reserve of free blocks is deemed necessary, 94 * however throughput drops by fifty percent if the file system 95 * is run at between 95% and 100% full; thus the minimum default 96 * value of fs_minfree is 5%. However, to get good clustering 97 * performance, 10% is a better choice. hence we use 10% as our 98 * default value. With 10% free space, fragmentation is not a 99 * problem, so we choose to optimize for time. 100 */ 101 #define MINFREE 5 102 103 /* 104 * Super block for an ext2fs file system. 105 */ 106 struct ext2fs { 107 u_int32_t e2fs_icount; /* Inode count */ 108 u_int32_t e2fs_bcount; /* blocks count */ 109 u_int32_t e2fs_rbcount; /* reserved blocks count */ 110 u_int32_t e2fs_fbcount; /* free blocks count */ 111 u_int32_t e2fs_ficount; /* free inodes count */ 112 u_int32_t e2fs_first_dblock; /* first data block */ 113 u_int32_t e2fs_log_bsize; /* block size = 1024*(2^e2fs_log_bsize) */ 114 u_int32_t e2fs_log_fsize; /* fragment size log2 */ 115 u_int32_t e2fs_bpg; /* blocks per group */ 116 u_int32_t e2fs_fpg; /* frags per group */ 117 u_int32_t e2fs_ipg; /* inodes per group */ 118 u_int32_t e2fs_mtime; /* mount time */ 119 u_int32_t e2fs_wtime; /* write time */ 120 u_int16_t e2fs_mnt_count; /* mount count */ 121 u_int16_t e2fs_max_mnt_count; /* max mount count */ 122 u_int16_t e2fs_magic; /* magic number */ 123 u_int16_t e2fs_state; /* file system state */ 124 u_int16_t e2fs_beh; /* behavior on errors */ 125 u_int16_t e2fs_minrev; /* minor revision level */ 126 u_int32_t e2fs_lastfsck; /* time of last fsck */ 127 u_int32_t e2fs_fsckintv; /* max time between fscks */ 128 u_int32_t e2fs_creator; /* creator OS */ 129 u_int32_t e2fs_rev; /* revision level */ 130 u_int16_t e2fs_ruid; /* default uid for reserved blocks */ 131 u_int16_t e2fs_rgid; /* default gid for reserved blocks */ 132 /* EXT2_DYNAMIC_REV superblocks */ 133 u_int32_t e2fs_first_ino; /* first non-reserved inode */ 134 u_int16_t e2fs_inode_size; /* size of inode structure */ 135 u_int16_t e2fs_block_group_nr; /* block grp number of this sblk*/ 136 u_int32_t e2fs_features_compat; /* compatible feature set */ 137 u_int32_t e2fs_features_incompat; /* incompatible feature set */ 138 u_int32_t e2fs_features_rocompat; /* RO-compatible feature set */ 139 u_int8_t e2fs_uuid[16]; /* 128-bit uuid for volume */ 140 char e2fs_vname[16]; /* volume name */ 141 char e2fs_fsmnt[64]; /* name mounted on */ 142 u_int32_t e2fs_algo; /* For compression */ 143 u_int8_t e2fs_prealloc; /* # of blocks to preallocate */ 144 u_int8_t e2fs_dir_prealloc; /* # of blocks to preallocate for dir */ 145 u_int16_t e2fs_reserved_ngdb; /* # of reserved gd blocks for resize */ 146 /* Ext3 JBD2 journaling. */ 147 u_int8_t e2fs_journal_uuid[16]; 148 u_int32_t e2fs_journal_ino; 149 u_int32_t e2fs_journal_dev; 150 u_int32_t e2fs_last_orphan; /* start of list of inodes to delete */ 151 u_int32_t e2fs_hash_seed[4]; /* htree hash seed */ 152 u_int8_t e2fs_def_hash_version; 153 u_int8_t e2fs_journal_backup_type; 154 u_int16_t e2fs_gdesc_size; 155 u_int32_t e2fs_default_mount_opts; 156 u_int32_t e2fs_first_meta_bg; 157 u_int32_t e2fs_mkfs_time; 158 u_int32_t e2fs_journal_backup[17]; 159 u_int32_t e2fs_bcount_hi; /* high bits of blocks count */ 160 u_int32_t e2fs_rbcount_hi; /* high bits of reserved blocks count */ 161 u_int32_t e2fs_fbcount_hi; /* high bits of free blocks count */ 162 u_int16_t e2fs_min_extra_isize; /* all inodes have some bytes */ 163 u_int16_t e2fs_want_extra_isize;/* inodes must reserve some bytes */ 164 u_int32_t e2fs_flags; /* miscellaneous flags */ 165 u_int16_t e2fs_raid_stride; /* RAID stride */ 166 u_int16_t e2fs_mmpintv; /* seconds to wait in MMP checking */ 167 u_int64_t e2fs_mmpblk; /* block for multi-mount protection */ 168 u_int32_t e2fs_raid_stripe_wid; /* blocks on data disks (N * stride) */ 169 u_int8_t e2fs_log_gpf; /* FLEX_BG group size */ 170 u_int8_t e2fs_chksum_type; /* metadata checksum algorithm used */ 171 u_int8_t e2fs_encrypt; /* versioning level for encryption */ 172 u_int8_t e2fs_reserved_pad; 173 u_int64_t e2fs_kbytes_written; /* number of lifetime kilobytes */ 174 u_int32_t e2fs_snapinum; /* inode number of active snapshot */ 175 u_int32_t e2fs_snapid; /* sequential ID of active snapshot */ 176 u_int64_t e2fs_snaprbcount; /* rsvd blocks for active snapshot */ 177 u_int32_t e2fs_snaplist; /* inode number for on-disk snapshot */ 178 u_int32_t e2fs_errcount; /* number of file system errors */ 179 u_int32_t e2fs_first_errtime; /* first time an error happened */ 180 u_int32_t e2fs_first_errino; /* inode involved in first error */ 181 u_int64_t e2fs_first_errblk; /* block involved of first error */ 182 u_int8_t e2fs_first_errfunc[32];/* function where error happened */ 183 u_int32_t e2fs_first_errline; /* line number where error happened */ 184 u_int32_t e2fs_last_errtime; /* most recent time of an error */ 185 u_int32_t e2fs_last_errino; /* inode involved in last error */ 186 u_int32_t e2fs_last_errline; /* line number where error happened */ 187 u_int64_t e2fs_last_errblk; /* block involved of last error */ 188 u_int8_t e2fs_last_errfunc[32];/* function where error happened */ 189 u_int8_t e2fs_mount_opts[64]; 190 u_int32_t e2fs_usrquota_inum; /* inode for tracking user quota */ 191 u_int32_t e2fs_grpquota_inum; /* inode for tracking group quota */ 192 u_int32_t e2fs_overhead_clusters;/* overhead blocks/clusters */ 193 u_int32_t e2fs_backup_bgs[2]; /* groups with sparse_super2 SBs */ 194 u_int8_t e2fs_encrypt_algos[4];/* encryption algorithms in use */ 195 u_int8_t e2fs_encrypt_pw_salt[16];/* salt used for string2key */ 196 u_int32_t e2fs_lpf_ino; /* location of the lost+found inode */ 197 u_int32_t e2fs_proj_quota_inum; /* inode for tracking project quota */ 198 u_int32_t e2fs_chksum_seed; /* checksum seed */ 199 u_int32_t e2fs_reserved[98]; /* padding to the end of the block */ 200 u_int32_t e2fs_sbchksum; /* superblock checksum */ 201 }; 202 203 204 /* in-memory data for ext2fs */ 205 struct m_ext2fs { 206 struct ext2fs e2fs; 207 u_char e2fs_fsmnt[MAXMNTLEN]; /* name mounted on */ 208 int8_t e2fs_ronly; /* mounted read-only flag */ 209 int8_t e2fs_fmod; /* super block modified flag */ 210 int32_t e2fs_fsize; /* fragment size */ 211 int32_t e2fs_bsize; /* block size */ 212 int32_t e2fs_bshift; /* ``lblkno'' calc of logical blkno */ 213 int32_t e2fs_bmask; /* ``blkoff'' calc of blk offsets */ 214 int64_t e2fs_qbmask; /* ~fs_bmask - for use with quad size */ 215 int32_t e2fs_fsbtodb; /* fsbtodb and dbtofsb shift constant */ 216 int32_t e2fs_ncg; /* number of cylinder groups */ 217 int32_t e2fs_ngdb; /* number of group descriptor block */ 218 int32_t e2fs_ipb; /* number of inodes per block */ 219 int32_t e2fs_itpg; /* number of inode table per group */ 220 off_t e2fs_maxfilesize; /* depends on LARGE/HUGE flags */ 221 struct ext2_gd *e2fs_gd; /* group descriptors */ 222 }; 223 224 static inline int 225 e2fs_overflow(struct m_ext2fs *fs, off_t lower, off_t value) 226 { 227 return (value < lower || value > fs->e2fs_maxfilesize); 228 } 229 230 /* 231 * Filesystem identification 232 */ 233 #define E2FS_MAGIC 0xef53 /* the ext2fs magic number */ 234 #define E2FS_REV0 0 /* revision levels */ 235 #define E2FS_REV1 1 /* revision levels */ 236 237 /* compatible/incompatible features */ 238 #define EXT2F_COMPAT_PREALLOC 0x0001 239 #define EXT2F_COMPAT_IMAGIC_INODES 0x0002 240 #define EXT2F_COMPAT_HAS_JOURNAL 0x0004 241 #define EXT2F_COMPAT_EXT_ATTR 0x0008 242 #define EXT2F_COMPAT_RESIZE 0x0010 243 #define EXT2F_COMPAT_DIR_INDEX 0x0020 244 #define EXT2F_COMPAT_SPARSE_SUPER2 0x0200 245 246 #define EXT2F_ROCOMPAT_SPARSE_SUPER 0x0001 247 #define EXT2F_ROCOMPAT_LARGE_FILE 0x0002 248 #define EXT2F_ROCOMPAT_BTREE_DIR 0x0004 249 #define EXT2F_ROCOMPAT_HUGE_FILE 0x0008 250 #define EXT2F_ROCOMPAT_GDT_CSUM 0x0010 251 #define EXT2F_ROCOMPAT_DIR_NLINK 0x0020 252 #define EXT2F_ROCOMPAT_EXTRA_ISIZE 0x0040 253 #define EXT2F_ROCOMPAT_QUOTA 0x0100 254 #define EXT2F_ROCOMPAT_BIGALLOC 0x0200 255 #define EXT2F_ROCOMPAT_METADATA_CKSUM 0x0400 256 #define EXT2F_ROCOMPAT_READONLY 0x1000 257 #define EXT2F_ROCOMPAT_PROJECT 0x2000 258 259 #define EXT2F_INCOMPAT_COMP 0x0001 260 #define EXT2F_INCOMPAT_FTYPE 0x0002 261 #define EXT2F_INCOMPAT_RECOVER 0x0004 262 #define EXT2F_INCOMPAT_JOURNAL_DEV 0x0008 263 #define EXT2F_INCOMPAT_META_BG 0x0010 264 #define EXT2F_INCOMPAT_EXTENTS 0x0040 265 #define EXT2F_INCOMPAT_64BIT 0x0080 266 #define EXT2F_INCOMPAT_MMP 0x0100 267 #define EXT2F_INCOMPAT_FLEX_BG 0x0200 268 #define EXT2F_INCOMPAT_EA_INODE 0x0400 269 #define EXT2F_INCOMPAT_DIRDATA 0x1000 270 #define EXT2F_INCOMPAT_CSUM_SEED 0x2000 271 #define EXT2F_INCOMPAT_LARGEDIR 0x4000 272 #define EXT2F_INCOMPAT_INLINE_DATA 0x8000 273 #define EXT2F_INCOMPAT_ENCRYPT 0x10000 274 275 struct ext2_feature { 276 uint32_t mask; 277 const char *name; 278 }; 279 280 static const struct ext2_feature ro_compat[] = { 281 { EXT2F_ROCOMPAT_SPARSE_SUPER, "sparse_super" }, 282 { EXT2F_ROCOMPAT_LARGE_FILE, "large_file" }, 283 { EXT2F_ROCOMPAT_BTREE_DIR, "btree_dir" }, 284 { EXT2F_ROCOMPAT_HUGE_FILE, "huge_file" }, 285 { EXT2F_ROCOMPAT_GDT_CSUM, "uninit_bg" }, 286 { EXT2F_ROCOMPAT_DIR_NLINK, "dir_nlink" }, 287 { EXT2F_ROCOMPAT_EXTRA_ISIZE, "extra_isize" }, 288 { EXT2F_ROCOMPAT_QUOTA, "quota" }, 289 { EXT2F_ROCOMPAT_BIGALLOC, "bigalloc" }, 290 { EXT2F_ROCOMPAT_METADATA_CKSUM, "metadata_csum" }, 291 { EXT2F_ROCOMPAT_READONLY, "read-only" }, 292 { EXT2F_ROCOMPAT_PROJECT, "project" } 293 }; 294 295 static const struct ext2_feature incompat[] = { 296 { EXT2F_INCOMPAT_COMP, "compression" }, 297 { EXT2F_INCOMPAT_FTYPE, "filetype" }, 298 { EXT2F_INCOMPAT_RECOVER, "needs_recovery" }, 299 { EXT2F_INCOMPAT_JOURNAL_DEV, "journal_dev" }, 300 { EXT2F_INCOMPAT_META_BG, "meta_bg" }, 301 { EXT2F_INCOMPAT_EXTENTS, "extents" }, 302 { EXT2F_INCOMPAT_64BIT, "64bit" }, 303 { EXT2F_INCOMPAT_MMP, "mmp" }, 304 { EXT2F_INCOMPAT_FLEX_BG, "flex_bg" }, 305 { EXT2F_INCOMPAT_EA_INODE, "ea_inode" }, 306 { EXT2F_INCOMPAT_DIRDATA, "dirdata" }, 307 { EXT2F_INCOMPAT_CSUM_SEED, "metadata_csum_seed" }, 308 { EXT2F_INCOMPAT_LARGEDIR, "large_dir" }, 309 { EXT2F_INCOMPAT_INLINE_DATA, "inline_data" }, 310 { EXT2F_INCOMPAT_ENCRYPT, "encrypt" } 311 }; 312 313 /* features supported in this implementation */ 314 #define EXT2F_COMPAT_SUPP 0x0000 315 #define EXT2F_ROCOMPAT_SUPP (EXT2F_ROCOMPAT_SPARSE_SUPER | \ 316 EXT2F_ROCOMPAT_LARGE_FILE) 317 #define EXT2F_INCOMPAT_SUPP (EXT2F_INCOMPAT_FTYPE) 318 #define EXT4F_RO_INCOMPAT_SUPP (EXT2F_INCOMPAT_EXTENTS | \ 319 EXT2F_INCOMPAT_FLEX_BG | \ 320 EXT2F_INCOMPAT_META_BG | \ 321 EXT2F_INCOMPAT_RECOVER) 322 323 /* 324 * Definitions of behavior on errors 325 */ 326 #define E2FS_BEH_CONTINUE 1 /* continue operation */ 327 #define E2FS_BEH_READONLY 2 /* remount fs read only */ 328 #define E2FS_BEH_PANIC 3 /* cause panic */ 329 #define E2FS_BEH_DEFAULT E2FS_BEH_CONTINUE 330 331 /* 332 * OS identification 333 */ 334 #define E2FS_OS_LINUX 0 335 #define E2FS_OS_HURD 1 336 #define E2FS_OS_MASIX 2 337 338 /* 339 * Filesystem clean flags 340 */ 341 #define E2FS_ISCLEAN 0x01 342 #define E2FS_ERRORS 0x02 343 344 /* ext2 file system block group descriptor */ 345 346 struct ext2_gd { 347 u_int32_t ext2bgd_b_bitmap; /* blocks bitmap block */ 348 u_int32_t ext2bgd_i_bitmap; /* inodes bitmap block */ 349 u_int32_t ext2bgd_i_tables; /* inodes table block */ 350 u_int16_t ext2bgd_nbfree; /* number of free blocks */ 351 u_int16_t ext2bgd_nifree; /* number of free inodes */ 352 u_int16_t ext2bgd_ndirs; /* number of directories */ 353 u_int16_t reserved; 354 u_int32_t reserved2[3]; 355 }; 356 357 /* 358 * If the EXT2F_ROCOMPAT_SPARSE_SUPER flag is set, the cylinder group has a 359 * copy of the super and cylinder group descriptors blocks only if it's 360 * a power of 3, 5 or 7 361 */ 362 363 static __inline__ int cg_has_sb(int) __attribute__((__unused__)); 364 static __inline int 365 cg_has_sb(int i) 366 { 367 int a3 ,a5 , a7; 368 369 if (i == 0 || i == 1) 370 return 1; 371 for (a3 = 3, a5 = 5, a7 = 7; 372 a3 <= i || a5 <= i || a7 <= i; 373 a3 *= 3, a5 *= 5, a7 *= 7) 374 if (i == a3 || i == a5 || i == a7) 375 return 1; 376 return 0; 377 } 378 379 /* 380 * Ext2 metadata is stored in little-endian byte order. 381 * JBD2 journal used in ext3 and ext4 is big-endian! 382 */ 383 #if BYTE_ORDER == LITTLE_ENDIAN 384 #define e2fs_sbload(old, new) memcpy((new), (old), SBSIZE); 385 #define e2fs_cgload(old, new, size) memcpy((new), (old), (size)); 386 #define e2fs_sbsave(old, new) memcpy((new), (old), SBSIZE); 387 #define e2fs_cgsave(old, new, size) memcpy((new), (old), (size)); 388 #else 389 void e2fs_sb_bswap(struct ext2fs *, struct ext2fs *); 390 void e2fs_cg_bswap(struct ext2_gd *, struct ext2_gd *, int); 391 #define e2fs_sbload(old, new) e2fs_sb_bswap((old), (new)) 392 #define e2fs_cgload(old, new, size) e2fs_cg_bswap((old), (new), (size)); 393 #define e2fs_sbsave(old, new) e2fs_sb_bswap((old), (new)) 394 #define e2fs_cgsave(old, new, size) e2fs_cg_bswap((old), (new), (size)); 395 #endif 396 397 /* 398 * Turn file system block numbers into disk block addresses. 399 * This maps file system blocks to device size blocks. 400 */ 401 #define fsbtodb(fs, b) ((b) << (fs)->e2fs_fsbtodb) 402 #define dbtofsb(fs, b) ((b) >> (fs)->e2fs_fsbtodb) 403 404 /* 405 * Macros for handling inode numbers: 406 * inode number to file system block offset. 407 * inode number to cylinder group number. 408 * inode number to file system block address. 409 */ 410 #define ino_to_cg(fs, x) (((x) - 1) / (fs)->e2fs.e2fs_ipg) 411 #define ino_to_fsba(fs, x) \ 412 ((fs)->e2fs_gd[ino_to_cg(fs, x)].ext2bgd_i_tables + \ 413 (((x)-1) % (fs)->e2fs.e2fs_ipg)/(fs)->e2fs_ipb) 414 #define ino_to_fsbo(fs, x) (((x)-1) % (fs)->e2fs_ipb) 415 416 /* 417 * Give cylinder group number for a file system block. 418 * Give cylinder group block number for a file system block. 419 */ 420 #define dtog(fs, d) (((d) - (fs)->e2fs.e2fs_first_dblock) / (fs)->e2fs.e2fs_fpg) 421 #define dtogd(fs, d) \ 422 (((d) - (fs)->e2fs.e2fs_first_dblock) % (fs)->e2fs.e2fs_fpg) 423 424 /* 425 * The following macros optimize certain frequently calculated 426 * quantities by using shifts and masks in place of divisions 427 * modulos and multiplications. 428 */ 429 #define blkoff(fs, loc) /* calculates (loc % fs->e2fs_bsize) */ \ 430 ((loc) & (fs)->e2fs_qbmask) 431 #define lblktosize(fs, blk) /* calculates (blk * fs->e2fs_bsize) */ \ 432 ((blk) << (fs)->e2fs_bshift) 433 #define lblkno(fs, loc) /* calculates (loc / fs->e2fs_bsize) */ \ 434 ((loc) >> (fs)->e2fs_bshift) 435 #define blkroundup(fs, size) /* calculates roundup(size, fs->e2fs_bsize) */ \ 436 (((size) + (fs)->e2fs_qbmask) & (fs)->e2fs_bmask) 437 #define fragroundup(fs, size) /* calculates roundup(size, fs->e2fs_bsize) */ \ 438 (((size) + (fs)->e2fs_qbmask) & (fs)->e2fs_bmask) 439 /* 440 * Determine the number of available frags given a 441 * percentage to hold in reserve. 442 */ 443 #define freespace(fs) \ 444 ((fs)->e2fs.e2fs_fbcount - (fs)->e2fs.e2fs_rbcount) 445 446 /* 447 * Number of indirects in a file system block. 448 */ 449 #define NINDIR(fs) ((fs)->e2fs_bsize / sizeof(u_int32_t)) 450