diff options
Diffstat (limited to 'ufs')
| -rw-r--r-- | ufs/dinode.h | 122 | ||||
| -rw-r--r-- | ufs/fs.h | 454 |
2 files changed, 576 insertions, 0 deletions
diff --git a/ufs/dinode.h b/ufs/dinode.h new file mode 100644 index 00000000..dfde2050 --- /dev/null +++ b/ufs/dinode.h @@ -0,0 +1,122 @@ +/* Format of an inode on disk + Copyright (C) 1991, 1993 Free Software Foundation + +This file is part of the GNU Hurd. + +The GNU Hurd is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +The GNU Hurd is distributed in the hope that it will be useful, +but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +GNU General Public License for more details. + +You should have received a copy of the GNU General Public License +along with the GNU Hurd; see the file COPYING. If not, write to +the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ + +/* Modified from UCB by Michael I. Bushnell. */ + +/* + * Copyright (c) 1982, 1989 The Regents of the University of California. + * All rights reserved. + * + * Redistribution is only permitted until one year after the first shipment + * of 4.4BSD by the Regents. Otherwise, redistribution and use in source and + * binary forms are permitted provided that: (1) source distributions retain + * this entire copyright notice and comment, and (2) distributions including + * binaries display the following acknowledgement: This product includes + * software developed by the University of California, Berkeley and its + * contributors'' in the documentation or other materials provided with the + * distribution and in all advertising materials mentioning features or use + * of this software. 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 AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED + * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. + * + * @(#)dinode.h 7.9 (Berkeley) 6/28/90 + */ + +/* + * This structure defines the on-disk format of an inode. + */ + +#define NDADDR 12 /* direct addresses in inode */ +#define NIADDR 3 /* indirect addresses in inode */ + +/* Indexes into di_ib */ +#define INDIR_SINGLE 0 +#define INDIR_DOUBLE 1 +#define INDIR_TRIPLE 2 /* NOT SUPPORTED */ + +struct dinode { + u_short di_model; /* 0: mode and type of file (low bits) */ + nlink_t di_nlink; /* 2: number of links to file */ + u_short di_uidl; /* 4: owner's user id (low bits) */ + u_short di_gidl; /* 6: owner's group id (low bits) */ + u_quad di_qsize; /* 8: number of bytes in file */ + time_t di_atime; /* 16: time last accessed */ + long di_atusec; + time_t di_mtime; /* 24: time last modified */ + long di_mtusec; + time_t di_ctime; /* 32: last time inode changed */ + long di_ctusec; + daddr_t di_db[NDADDR]; /* 40: disk block addresses */ + daddr_t di_ib[NIADDR]; /* 88: indirect blocks */ + long di_flags; /* 100: status, currently unused */ + long di_blocks; /* 104: blocks actually held */ + long di_gen; /* 108: generation number */ + long di_trans; /* 112: filesystem tranlator */ + uid_t di_author; /* 116: author id */ + u_short di_uidh; /* 120: user id (high bits) */ + u_short di_gidh; /* 122: group id (high bits) */ + u_short di_modeh; /* 124: mode (high bits) */ + short di_spare; /* 126: reserved, currently unused */ +}; + +#define DI_UID(di) ((di)->di_uidl | ((int)(di)->di_uidh << 16)) +#define DI_GID(di) ((di)->di_gidl | ((int)(di)->di_gidh << 16)) +#define DI_MODE(di) ((di)->di_model | ((int)(di)->di_modeh << 16)) + +#define LINK_MAX 32767 /* limited by width of nlink_t == 16 bits */ + +#if BYTE_ORDER == LITTLE_ENDIAN || defined(tahoe) /* ugh! -- must be fixed */ +#define di_size di_qsize.val[0] +#else /* BYTE_ORDER == BIG_ENDIAN */ +#define di_size di_qsize.val[1] +#endif +#define di_rdev di_db[0] + +/* file modes -- these are known to match appropriate values in gnu/stat.h */ +#define IFMT 000000170000 /* type of file */ +#define IFIFO 000000010000 /* named pipe (fifo) */ +#define IFCHR 000000020000 /* character special */ +#define IFDIR 000000040000 /* directory */ +#define IFBLK 000000060000 /* block special */ +#define IFREG 000000100000 /* regular */ +#define IFLNK 000000120000 /* symbolic link */ +#define IFSOCK 000000140000 /* socket */ + +#define ISPEC 000000607000 /* special user-changeable bits */ +#define INOCACHE 000000400000 /* don't cache contents */ +#define IUSEUNK 000000200000 /* use IUNK in pref to IKNOWN */ +#define ISUID 000000004000 /* set user id on execution */ +#define ISGID 000000002000 /* set group id on execution */ +#define ISVTX 000000001000 /* caching preference / append only dir */ + +/* masks for various sets of permissions: */ +#define IOWNER 000000000700 /* owner of file */ +#define IGROUP 000000000070 /* group of file */ +#define IKNOWN 000000000007 /* anyone who possesses a uid */ +#define IUNKNOWN 000007000000 /* anyone who doesn't possess a uid */ + +#define ISPARE 037770000000 /* unused (yet) */ + +#define IREAD 0400 /* read, write, execute permissions */ +#define IWRITE 0200 +#define IEXEC 0100 + diff --git a/ufs/fs.h b/ufs/fs.h new file mode 100644 index 00000000..c1dd5681 --- /dev/null +++ b/ufs/fs.h @@ -0,0 +1,454 @@ +/* Format of a filesystem on disk (superblock and cylinder groups) + Copyright (C) 1991, 1993 Free Software Foundation + +This file is part of the GNU Hurd. + +The GNU Hurd is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +The GNU Hurd is distributed in the hope that it will be useful, +but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +GNU General Public License for more details. + +You should have received a copy of the GNU General Public License +along with the GNU Hurd; see the file COPYING. If not, write to +the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ + +/* Modified from UCB by Michael I. Bushnell. */ + +/* + * Copyright (c) 1982, 1986 Regents of the University of California. + * All rights reserved. + * + * Redistribution is only permitted until one year after the first shipment + * of 4.4BSD by the Regents. Otherwise, redistribution and use in source and + * binary forms are permitted provided that: (1) source distributions retain + * this entire copyright notice and comment, and (2) distributions including + * binaries display the following acknowledgement: This product includes + * software developed by the University of California, Berkeley and its + * contributors'' in the documentation or other materials provided with the + * distribution and in all advertising materials mentioning features or use + * of this software. 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 AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED + * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. + * + * @(#)fs.h 7.10 (Berkeley) 6/28/90 + */ + +/* + * 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. + * + * For file system fs, the offsets of the various blocks of interest + * are given in the super block as: + * [fs->fs_sblkno] Super-block + * [fs->fs_cblkno] Cylinder group block + * [fs->fs_iblkno] Inode blocks + * [fs->fs_dblkno] Data blocks + * The beginning of cylinder group cg in fs, is given by + * the ``cgbase(fs, cg)'' macro. + * + * 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 8192 +#define SBSIZE 8192 +#define BBOFF ((off_t)(0)) +#define SBOFF ((off_t)(BBOFF + BBSIZE)) +#define BBLOCK ((daddr_t)(0)) +#define SBLOCK ((daddr_t)(BBLOCK + BBSIZE / DEV_BSIZE)) + +/* + * Addresses stored in inodes are capable of addressing fragments + * of `blocks'. File system blocks of at most size MAXBSIZE can + * be optionally broken into 2, 4, or 8 pieces, each of which is + * addressible; these pieces may be DEV_BSIZE, or some multiple of + * a DEV_BSIZE unit. + * + * Large files consist of exclusively large data blocks. To avoid + * undue wasted disk space, the last data block of a small file may be + * allocated as only as many fragments of a large block as are + * necessary. The file system format retains only a single pointer + * to such a fragment, which is a piece of a single large block that + * has been divided. The size of such a fragment is determinable from + * information in the inode, using the ``blksize(fs, ip, lbn)'' macro. + * + * The file system records space availability at the fragment level; + * to determine block availability, aligned fragments are examined. + * + * The root inode is the root of the file system. + * Inode 0 can't be used for normal purposes and + * historically bad blocks were linked to inode 1, + * thus the root inode is 2. (inode 1 is no longer used for + * this purpose, however numerous dump tapes make this + * assumption, so we are stuck with it) + */ +#define ROOTINO ((ino_t)2) /* i number of all roots */ + +/* + * MINBSIZE is the smallest allowable block size. + * In order to insure that it is possible to create files of size + * 2^32 with only two levels of indirection, MINBSIZE is set to 4096. + * 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 MINBSIZE 4096 + +/* + * 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. + * The limit on the amount of summary information per file system + * is defined by MAXCSBUFS. It is currently parameterized for a + * maximum of two million cylinders. + */ +#define MAXMNTLEN 512 +#define MAXCSBUFS 32 +#define MAXFRAG 8 + +/* + * Per cylinder group information; summarized in blocks allocated + * from first cylinder group data blocks. These blocks have to be + * read in from fs_csaddr (size fs_cssize) in addition to the + * super block. + * + * N.B. sizeof(struct csum) must be a power of two in order for + * the ``fs_cs'' macro to work (see below). + */ +struct csum { + long cs_ndir; /* number of directories */ + long cs_nbfree; /* number of free blocks */ + long cs_nifree; /* number of free inodes */ + long cs_nffree; /* number of free frags */ +}; + +/* + * Super block for a file system. + */ +#define FS_MAGIC 0x011954 +#define FSOKAY 0x7c269d38 +struct fs +{ + struct fs *fs_link; /* linked list of file systems */ + struct fs *fs_rlink; /* used for incore super blocks */ + daddr_t fs_sblkno; /* addr of super-block in filesys */ + daddr_t fs_cblkno; /* offset of cyl-block in filesys */ + daddr_t fs_iblkno; /* offset of inode-blocks in filesys */ + daddr_t fs_dblkno; /* offset of first data after cg */ + long fs_cgoffset; /* cylinder group offset in cylinder */ + long fs_cgmask; /* used to calc mod fs_ntrak */ + long fs_time; /* last time written */ + long fs_size; /* number of blocks in fs */ + long fs_dsize; /* number of data blocks in fs */ + long fs_ncg; /* number of cylinder groups */ + long fs_bsize; /* size of basic blocks in fs */ + long fs_fsize; /* size of frag blocks in fs */ + long fs_frag; /* number of frags in a block in fs */ +/* these are configuration parameters */ + long fs_minfree; /* minimum percentage of free blocks */ + long fs_rotdelay; /* num of ms for optimal next block */ + long fs_rps; /* disk revolutions per second */ +/* these fields can be computed from the others */ + long fs_bmask; /* ``blkoff'' calc of blk offsets */ + long fs_fmask; /* ``fragoff'' calc of frag offsets */ + long fs_bshift; /* ``lblkno'' calc of logical blkno */ + long fs_fshift; /* ``numfrags'' calc number of frags */ +/* these are configuration parameters */ + long fs_maxcontig; /* max number of contiguous blks */ + long fs_maxbpg; /* max number of blks per cyl group */ +/* these fields can be computed from the others */ + long fs_fragshift; /* block to frag shift */ + long fs_fsbtodb; /* fsbtodb and dbtofsb shift constant */ + long fs_sbsize; /* actual size of super block */ + long fs_csmask; /* csum block offset */ + long fs_csshift; /* csum block number */ + long fs_nindir; /* value of NINDIR */ + long fs_inopb; /* value of INOPB */ + long fs_nspf; /* value of NSPF */ +/* yet another configuration parameter */ + long fs_optim; /* optimization preference, see below */ +/* these fields are derived from the hardware */ + long fs_npsect; /* # sectors/track including spares */ + long fs_interleave; /* hardware sector interleave */ + long fs_trackskew; /* sector 0 skew, per track */ + long fs_headswitch; /* head switch time, usec */ + long fs_trkseek; /* track-to-track seek, usec */ +/* sizes determined by number of cylinder groups and their sizes */ + daddr_t fs_csaddr; /* blk addr of cyl grp summary area */ + long fs_cssize; /* size of cyl grp summary area */ + long fs_cgsize; /* cylinder group size */ +/* these fields are derived from the hardware */ + long fs_ntrak; /* tracks per cylinder */ + long fs_nsect; /* sectors per track */ + long fs_spc; /* sectors per cylinder */ +/* this comes from the disk driver partitioning */ + long fs_ncyl; /* cylinders in file system */ +/* these fields can be computed from the others */ + long fs_cpg; /* cylinders per group */ + long fs_ipg; /* inodes per group */ + long fs_fpg; /* blocks per group * fs_frag */ +/* this data must be re-computed after crashes */ + struct csum fs_cstotal; /* cylinder summary information */ +/* these fields are cleared at mount time */ + char fs_fmod; /* super block modified flag */ + char fs_clean; /* file system is clean flag */ + char fs_ronly; /* mounted read-only flag */ + char fs_flags; /* currently unused flag */ + char fs_fsmnt[MAXMNTLEN]; /* name mounted on */ +/* these fields retain the current block allocation info */ + long fs_cgrotor; /* last cg searched */ + struct csum *fs_csp[MAXCSBUFS];/* list of fs_cs info buffers */ + long fs_cpc; /* cyl per cycle in postbl */ + short fs_opostbl[16][8]; /* old rotation block list head */ + long fs_sparecon[55]; /* reserved for future constants */ + long fs_state; /* validate fs_clean field */ + quad fs_qbmask; /* ~fs_bmask - for use with quad size */ + quad fs_qfmask; /* ~fs_fmask - for use with quad size */ + long fs_postblformat; /* format of positional layout tables */ + long fs_nrpos; /* number of rotaional positions */ + long fs_postbloff; /* (short) rotation block list head */ + long fs_rotbloff; /* (u_char) blocks for each rotation */ + long fs_magic; /* magic number */ + unsigned char fs_space[1]; /* list of blocks for each rotation */ +/* actually longer */ +}; +/* + * Preference for optimization. + */ +#define FS_OPTTIME 0 /* minimize allocation time */ +#define FS_OPTSPACE 1 /* minimize disk fragmentation */ + +/* + * Rotational layout table format types + */ +#define FS_42POSTBLFMT -1 /* 4.2BSD rotational table format */ +#define FS_DYNAMICPOSTBLFMT 1 /* dynamic rotational table format */ +/* + * Macros for access to superblock array structures + */ +#define fs_postbl(cylno) \ + ((sblock->fs_postblformat == FS_42POSTBLFMT) \ + ? (sblock->fs_opostbl[cylno]) \ + : ((short *)((char *)sblock + sblock->fs_postbloff) \ + + (cylno) * sblock->fs_nrpos)) +#define fs_rotbl \ + ((sblock->fs_postblformat == FS_42POSTBLFMT) \ + ? (sblock->fs_space) \ + : ((unsigned char *)((char *)sblock + sblock->fs_rotbloff))) + +/* + * Convert cylinder group to base address of its global summary info. + * + * N.B. This macro assumes that sizeof(struct csum) is a power of two. + */ +#define fs_cs(indx) \ + fs_csp[(indx) >> sblock->fs_csshift][(indx) & ~sblock->fs_csmask] + +/* + * Cylinder group block for a file system. + */ +#define CG_MAGIC 0x090255 +struct cg { + struct cg *cg_link; /* linked list of cyl groups */ + long cg_magic; /* magic number */ + long cg_time; /* time last written */ + long cg_cgx; /* we are the cgx'th cylinder group */ + short cg_ncyl; /* number of cyl's this cg */ + short cg_niblk; /* number of inode blocks this cg */ + long cg_ndblk; /* number of data blocks this cg */ + struct csum cg_cs; /* cylinder summary information */ + long cg_rotor; /* position of last used block */ + long cg_frotor; /* position of last used frag */ + long cg_irotor; /* position of last used inode */ + long cg_frsum[MAXFRAG]; /* counts of available frags */ + long cg_btotoff; /* (long) block totals per cylinder */ + long cg_boff; /* (short) free block positions */ + long cg_iusedoff; /* (char) used inode map */ + long cg_freeoff; /* (u_char) free block map */ + long cg_nextfreeoff; /* (u_char) next available space */ + long cg_sparecon[16]; /* reserved for future use */ + unsigned char cg_space[1]; /* space for cylinder group maps */ +/* actually longer */ +}; +/* + * Macros for access to cylinder group array structures + */ +#define cg_blktot(cgp) \ + (((cgp)->cg_magic != CG_MAGIC) \ + ? (((struct ocg *)(cgp))->cg_btot) \ + : ((long *)((char *)(cgp) + (cgp)->cg_btotoff))) +#define cg_blks(cgp, cylno) \ + (((cgp)->cg_magic != CG_MAGIC) \ + ? (((struct ocg *)(cgp))->cg_b[cylno]) \ + : ((short *)((char *)(cgp) + (cgp)->cg_boff) + (cylno) * sblock->fs_nrpos)) +#define cg_inosused(cgp) \ + (((cgp)->cg_magic != CG_MAGIC) \ + ? (((struct ocg *)(cgp))->cg_iused) \ + : ((char *)((char *)(cgp) + (cgp)->cg_iusedoff))) +#define cg_blksfree(cgp) \ + (((cgp)->cg_magic != CG_MAGIC) \ + ? (((struct ocg *)(cgp))->cg_free) \ + : ((unsigned char *)((char *)(cgp) + (cgp)->cg_freeoff))) +#define cg_chkmagic(cgp) \ + ((cgp)->cg_magic == CG_MAGIC || ((struct ocg *)(cgp))->cg_magic == CG_MAGIC) + +/* + * The following structure is defined + * for compatibility with old file systems. + */ +struct ocg { + struct ocg *cg_link; /* linked list of cyl groups */ + struct ocg *cg_rlink; /* used for incore cyl groups */ + long cg_time; /* time last written */ + long cg_cgx; /* we are the cgx'th cylinder group */ + short cg_ncyl; /* number of cyl's this cg */ + short cg_niblk; /* number of inode blocks this cg */ + long cg_ndblk; /* number of data blocks this cg */ + struct csum cg_cs; /* cylinder summary information */ + long cg_rotor; /* position of last used block */ + long cg_frotor; /* position of last used frag */ + long cg_irotor; /* position of last used inode */ + long cg_frsum[8]; /* counts of available frags */ + long cg_btot[32]; /* block totals per cylinder */ + short cg_b[32][8]; /* positions of free blocks */ + char cg_iused[256]; /* used inode map */ + long cg_magic; /* magic number */ + unsigned char cg_free[1]; /* free block map */ +/* actually longer */ +}; + +/* + * Turn file system block numbers into disk block addresses. + * This maps file system blocks to device size blocks. + */ +#define fsbtodb(b) ((b) << sblock->fs_fsbtodb) +#define dbtofsb(b) ((b) >> sblock->fs_fsbtodb) + +/* + * Cylinder group macros to locate things in cylinder groups. + * They calc file system addresses of cylinder group data structures. + */ +#define cgbase(c) ((daddr_t)(sblock->fs_fpg * (c))) +#define cgstart(c) \ + (cgbase(c) + sblock->fs_cgoffset * ((c) & ~(sblock->fs_cgmask))) +#define cgsblock(c) (cgstart(c) + sblock->fs_sblkno) /* super blk */ +#define cgtod(c) (cgstart(c) + sblock->fs_cblkno) /* cg block */ +#define cgimin(c) (cgstart(c) + sblock->fs_iblkno) /* inode blk */ +#define cgdmin(c) (cgstart(c) + sblock->fs_dblkno) /* 1st data */ + +/* + * 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 itoo(x) ((x) % INOPB) +#define itog(x) ((x) / sblock->fs_ipg) +#define itod(x) \ + ((daddr_t)(cgimin(itog(x)) + \ + (blkstofrags((((x) % sblock->fs_ipg) / INOPB))))) + +/* + * Give cylinder group number for a file system block. + * Give cylinder group block number for a file system block. + */ +#define dtog(d) ((d) / sblock->fs_fpg) +#define dtogd(d) ((d) % sblock->fs_fpg) + +/* + * Extract the bits for a block from a map. + * Compute the cylinder and rotational position of a cyl block addr. + */ +#define blkmap(map, loc) \ + (((map)[(loc) / NBBY] >> ((loc) % NBBY)) & (0xff >> (NBBY - sblock->fs_frag))) +#define cbtocylno(bno) \ + ((bno) * NSPF / sblock->fs_spc) +#define cbtorpos(bno) \ + (((bno) * NSPF % sblock->fs_spc / sblock->fs_nsect * sblock->fs_trackskew + \ + (bno) * NSPF % sblock->fs_spc % sblock->fs_nsect * sblock->fs_interleave) % \ + sblock->fs_nsect * sblock->fs_nrpos / sblock->fs_npsect) + +/* + * The following macros optimize certain frequently calculated + * quantities by using shifts and masks in place of divisions + * modulos and multiplications. + */ +#define blkoff(loc) /* calculates (loc % fs->fs_bsize) */ \ + ((loc) & ~sblock->fs_bmask) +#define fragoff(loc) /* calculates (loc % fs->fs_fsize) */ \ + ((loc) & ~sblock->fs_fmask) +#define lblktosize(blk) /* calculates (blk * fs->fs_bsize) */ \ + ((blk) << sblock->fs_bshift) +#define lblkno(loc) /* calculates (loc / fs->fs_bsize) */ \ + ((loc) >> sblock->fs_bshift) +#define numfrags(loc) /* calculates (loc / fs->fs_fsize) */ \ + ((loc) >> sblock->fs_fshift) +#define blkroundup(size) /* calculates roundup(size, fs->fs_bsize) */ \ + (((size) + sblock->fs_bsize - 1) & sblock->fs_bmask) +#define fragroundup(size) /* calculates roundup(size, fs->fs_fsize) */ \ + (((size) + sblock->fs_fsize - 1) & sblock->fs_fmask) +#define fragstoblks(frags) /* calculates (frags / fs->fs_frag) */ \ + ((frags) >> sblock->fs_fragshift) +#define blkstofrags(blks) /* calculates (blks * fs->fs_frag) */ \ + ((blks) << sblock->fs_fragshift) +#define fragnum(fsb) /* calculates (fsb % fs->fs_frag) */ \ + ((fsb) & (sblock->fs_frag - 1)) +#define blknum(fsb) /* calculates rounddown(fsb, fs->fs_frag) */ \ + ((fsb) &~ (sblock->fs_frag - 1)) + +/* + * Determine the number of available frags given a + * percentage to hold in reserve + */ +#define freespace(percentreserved) \ + (blkstofrags(sblock->fs_cstotal.cs_nbfree) + \ + sblock->fs_cstotal.cs_nffree - (sblock->fs_dsize * (percentreserved) / 100)) + +/* + * Determining the size of a file block in the file system. + */ +#define blksize(ip, lbn) \ + (((lbn) >= NDADDR || (ip)->i_allocsize >= ((lbn) + 1) << sblock->fs_bshift) \ + ? sblock->fs_bsize \ + : (fragroundup(blkoff((ip)->i_allocsize)))) +#define dblksize(dip, lbn) \ + (((lbn) >= NDADDR || (dip)->di_size >= ((lbn) + 1) << sblock->fs_bshift) \ + ? sblock->fs_bsize \ + : (fragroundup(blkoff((dip)->di_size)))) + +/* + * Number of disk sectors per block; assumes DEV_BSIZE byte sector size. + */ +#define NSPB (sblock->fs_nspf << sblock->fs_fragshift) +#define NSPF (sblock->fs_nspf) + +/* + * INOPB is the number of inodes in a secondary storage block. + */ +#define INOPB (sblock->fs_inopb) +#define INOPF (sblock->fs_inopb >> sblock->fs_fragshift) + +/* + * NINDIR is the number of indirects in a file system block. + */ +#define NINDIR (sblock->fs_nindir) + +#ifdef KERNEL +struct fs *getfs(); +#endif |