X-Git-Url: https://git.subgeniuskitty.com/unix-history/.git/blobdiff_plain/d37938c8a955ef988a22365fa930f6deb484961a..ed554bc5e4201344d7eaad78263566e79428759c:/usr/src/sys/ufs/ffs/fs.h diff --git a/usr/src/sys/ufs/ffs/fs.h b/usr/src/sys/ufs/ffs/fs.h index 62aa5bca61..bef052feef 100644 --- a/usr/src/sys/ufs/ffs/fs.h +++ b/usr/src/sys/ufs/ffs/fs.h @@ -1,6 +1,37 @@ -/* Copyright (c) 1981 Regents of the University of California */ - -/* fs.h 1.12 %G% */ +/* + * 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. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. 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 8.7 (Berkeley) 4/19/94 + */ /* * Each disk drive contains some number of file systems. @@ -10,24 +41,26 @@ * 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 mkfs time and the critical + * 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_bblkno] Boot sector * [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(cg, fs)'' macro. + * 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 1024 +#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)) @@ -48,90 +81,52 @@ * * 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) - * The lost+found directory is given the next available - * inode when it is created by ``mkfs''. */ -#define ROOTINO ((ino_t)2) /* i number of all roots */ -#define LOSTFOUNDINO (ROOTINO + 1) /* - * 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 severe performance degredations will be observed if the - * file system is run at greater than 90% full; thus the default - * value of fs_minfree is 10%. - * - * Empirically the best trade-off between block fragmentation and - * overall disk utilization at a loading of 90% comes with a - * fragmentation of 4, thus the default fragment size is a fourth - * of the block size. - */ -#define MINFREE 10 -#define DESFRAG 4 - -/* - * Under current technology, most 300MB disks have 32 sectors and - * 19 tracks, thus these are the defaults used for fs_nsect and - * fs_ntrak respectively. + * 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 DFLNSECT 32 -#define DFLNTRAK 19 +#define MINBSIZE 4096 /* - * Cylinder group related limits. - * - * For each cylinder we keep track of the availability of blocks at different - * rotational positions, so that we can lay out the data to be picked - * up with minimum rotational latency. NRPOS is the number of rotational - * positions which we distinguish. With NRPOS 8 the resolution of our - * summary information is 2ms for a typical 3600 rpm drive. - * - * ROTDELAY gives the minimum number of milliseconds to initiate - * another disk transfer on the same cylinder. It is used in - * determining the rotationally optimal layout for disk blocks - * within a file; the default of fs_rotdelay is 2ms. + * 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 NRPOS 8 /* number distinct rotational positions */ -#define ROTDELAY 2 +#define MAXMNTLEN 512 +#define MAXCSBUFS 32 /* - * Each file system has a number of inodes statically allocated. - * We allocate one inode slot per NBPI bytes, expecting this - * to be far more than we will ever need. - * - * MAXIPG bounds the number of inodes per cylinder group, and - * is needed only to keep the structure simpler by having the - * only a single variable size element (the free bit map). - * - * N.B.: MAXIPG must be a multiple of INOPB(fs). + * 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. To conserve space, a maximum summary size + * is set by FS_MAXCONTIG. */ -#define NBPI 2048 -#define MAXIPG 2048 /* max number inodes/cyl group */ +#define FS_MAXCONTIG 16 /* - * 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. - * MAXCPG is limited only to dimension an array in (struct cg); - * it can be made larger as long as that structures size remains - * within the bounds dictated by MINBSIZE. - * Note that super blocks are always of size MAXBSIZE, - * and that MAXBSIZE must be >= MINBSIZE. + * 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 MINBSIZE 4096 -#define DESCPG 16 /* desired fs_cpg */ -#define MAXCPG 32 /* maximum fs_cpg */ +#define MINFREE 5 +#define DEFAULTOPT FS_OPTTIME /* * Per cylinder group information; summarized in blocks allocated @@ -152,79 +147,154 @@ struct csum { /* * Super block for a file system. */ -#define FS_MAGIC 0x110854 -struct fs -{ - long fs_magic; /* magic number */ - daddr_t fs_bblkno; /* abs addr of boot-block in filesys */ - daddr_t fs_sblkno; /* abs addr of super-block in filesys */ +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 data-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 */ time_t 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 */ - short fs_frag; /* number of frags in a block in fs */ - short fs_minfree; /* minimum percentage of free blocks */ - short fs_rotdelay; /* num of ms for optimal next block */ - short fs_rps; /* disk revolutions per second */ + 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 should be derived from the hardware */ - short fs_ntrak; /* tracks per cylinder */ - short fs_nsect; /* sectors per track */ +/* 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 */ - short fs_cpg; /* cylinders per group */ - short fs_ipg; /* inodes per group */ + 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_fsmnt[34]; /* name mounted on */ + 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[NBUF]; /* list of fs_cs info buffers */ - short fs_cpc; /* cyl per cycle in postbl */ - short fs_postbl[MAXCPG][NRPOS];/* head of blocks for each rotation */ - u_char fs_rotbl[1]; /* list of blocks for each rotation */ + 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[50]; /* reserved for future constants */ + long fs_contigsumsize; /* size of cluster summary array */ + long fs_maxsymlinklen; /* max length of an internal symlink */ + long fs_inodefmt; /* format of on-disk inodes */ + u_quad_t fs_maxfilesize; /* maximum representable file size */ + quad_t fs_qbmask; /* ~fs_bmask - for use with quad size */ + quad_t fs_qfmask; /* ~fs_fmask - for use with quad size */ + long fs_state; /* validate fs_clean field */ + long fs_postblformat; /* format of positional layout tables */ + long fs_nrpos; /* number of rotational positions */ + long fs_postbloff; /* (short) rotation block list head */ + long fs_rotbloff; /* (u_char) blocks for each rotation */ + long fs_magic; /* magic number */ + u_char fs_space[1]; /* list of blocks for each rotation */ /* actually longer */ }; +/* + * Filesystem idetification + */ +#define FS_MAGIC 0x011954 /* the fast filesystem magic number */ +#define FS_OKAY 0x7c269d38 /* superblock checksum */ +#define FS_42INODEFMT -1 /* 4.2BSD inode format */ +#define FS_44INODEFMT 2 /* 4.4BSD inode format */ +/* + * Preference for optimization. + */ +#define FS_OPTTIME 0 /* minimize allocation time */ +#define FS_OPTSPACE 1 /* minimize disk fragmentation */ /* - * 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. + * Rotational layout table format types */ -#define fs_cs(fs, indx) \ - fs_csp[(indx) / ((fs)->fs_bsize / sizeof(struct csum))] \ - [(indx) % ((fs)->fs_bsize / sizeof(struct csum))] +#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(fs, cylno) \ + (((fs)->fs_postblformat == FS_42POSTBLFMT) \ + ? ((fs)->fs_opostbl[cylno]) \ + : ((short *)((char *)(fs) + (fs)->fs_postbloff) + (cylno) * (fs)->fs_nrpos)) +#define fs_rotbl(fs) \ + (((fs)->fs_postblformat == FS_42POSTBLFMT) \ + ? ((fs)->fs_space) \ + : ((u_char *)((char *)(fs) + (fs)->fs_rotbloff))) /* - * MAXBPC bounds the size of the rotational layout tables and - * is limited by the fact that the super block is of size SBSIZE. - * The size of these tables is INVERSELY proportional to the block - * size of the file system. It is aggravated by sector sizes that - * are not powers of two, as this increases the number of cylinders - * included before the rotational pattern repeats (fs_cpc). - * Its size is derived from the number of bytes remaining in (struct fs) + * The size of a cylinder group is calculated by CGSIZE. The maximum size + * is limited by the fact that cylinder groups are at most one block. + * Its size is derived from the size of the maps maintained in the + * cylinder group and the (struct cg) size. */ -#define MAXBPC (SBSIZE - sizeof (struct fs)) +#define CGSIZE(fs) \ + /* base cg */ (sizeof(struct cg) + sizeof(long) + \ + /* blktot size */ (fs)->fs_cpg * sizeof(long) + \ + /* blks size */ (fs)->fs_cpg * (fs)->fs_nrpos * sizeof(short) + \ + /* inode map */ howmany((fs)->fs_ipg, NBBY) + \ + /* block map */ howmany((fs)->fs_cpg * (fs)->fs_spc / NSPF(fs), NBBY) +\ + /* if present */ ((fs)->fs_contigsumsize <= 0 ? 0 : \ + /* cluster sum */ (fs)->fs_contigsumsize * sizeof(long) + \ + /* cluster map */ howmany((fs)->fs_cpg * (fs)->fs_spc / NSPB(fs), NBBY))) + +/* + * 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(fs, indx) \ + fs_csp[(indx) >> (fs)->fs_csshift][(indx) & ~(fs)->fs_csmask] /* * Cylinder group block for a file system. */ -#define CG_MAGIC 0x092752 +#define CG_MAGIC 0x090255 struct cg { + struct cg *cg_link; /* linked list of cyl groups */ long cg_magic; /* magic number */ time_t cg_time; /* time last written */ long cg_cgx; /* we are the cgx'th cylinder group */ @@ -236,104 +306,184 @@ struct cg { 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_btot[MAXCPG]; /* block totals per cylinder */ - short cg_b[MAXCPG][NRPOS]; /* positions of free blocks */ - char cg_iused[MAXIPG/NBBY]; /* used inode map */ - char cg_free[1]; /* free block map */ + 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_clustersumoff; /* (long) counts of avail clusters */ + long cg_clusteroff; /* (char) free cluster map */ + long cg_nclusterblks; /* number of clusters this cg */ + long cg_sparecon[13]; /* reserved for future use */ + u_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(fs, cgp, cylno) \ + (((cgp)->cg_magic != CG_MAGIC) \ + ? (((struct ocg *)(cgp))->cg_b[cylno]) \ + : ((short *)((char *)(cgp) + (cgp)->cg_boff) + (cylno) * (fs)->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) \ + : ((u_char *)((char *)(cgp) + (cgp)->cg_freeoff))) +#define cg_chkmagic(cgp) \ + ((cgp)->cg_magic == CG_MAGIC || ((struct ocg *)(cgp))->cg_magic == CG_MAGIC) +#define cg_clustersfree(cgp) \ + ((u_char *)((char *)(cgp) + (cgp)->cg_clusteroff)) +#define cg_clustersum(cgp) \ + ((long *)((char *)(cgp) + (cgp)->cg_clustersumoff)) /* - * MAXBPG bounds the number of blocks of data per cylinder group, - * and is limited by the fact that cylinder groups are at most one block. - * Its size is derived from the size of blocks and the (struct cg) size, - * by the number of remaining bits. + * The following structure is defined + * for compatibility with old file systems. */ -#define MAXBPG(fs) \ - (NBBY * ((fs)->fs_bsize - (sizeof (struct cg))) / (fs)->fs_frag) +struct ocg { + struct ocg *cg_link; /* linked list of cyl groups */ + struct ocg *cg_rlink; /* used for incore cyl groups */ + time_t 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 */ + u_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(fs, b) ((b) * ((fs)->fs_fsize / DEV_BSIZE)) -#define dbtofsb(fs, b) ((b) / ((fs)->fs_fsize / DEV_BSIZE)) +#define fsbtodb(fs, b) ((b) << (fs)->fs_fsbtodb) +#define dbtofsb(fs, b) ((b) >> (fs)->fs_fsbtodb) /* * Cylinder group macros to locate things in cylinder groups. - * - * cylinder group to disk block address of spare boot block - * and super block - * Note that these are in absolute addresses, and can NOT - * in general be expressable in terms of file system addresses. + * They calc file system addresses of cylinder group data structures. */ -#define cgbblock(c,fs) (fsbtodb(fs, cgbase(c,fs)) + (fs)->fs_bblkno) -#define cgsblock(c,fs) (fsbtodb(fs, cgbase(c,fs)) + (fs)->fs_sblkno) +#define cgbase(fs, c) ((daddr_t)((fs)->fs_fpg * (c))) +#define cgdmin(fs, c) (cgstart(fs, c) + (fs)->fs_dblkno) /* 1st data */ +#define cgimin(fs, c) (cgstart(fs, c) + (fs)->fs_iblkno) /* inode blk */ +#define cgsblock(fs, c) (cgstart(fs, c) + (fs)->fs_sblkno) /* super blk */ +#define cgtod(fs, c) (cgstart(fs, c) + (fs)->fs_cblkno) /* cg block */ +#define cgstart(fs, c) \ + (cgbase(fs, c) + (fs)->fs_cgoffset * ((c) & ~((fs)->fs_cgmask))) /* - * file system addresses of cylinder group data structures + * 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 cgbase(c,fs) ((daddr_t)((fs)->fs_fpg * (c))) /* base addr */ -#define cgtod(c,fs) (cgbase(c,fs) + (fs)->fs_cblkno) /* cg block */ -#define cgimin(c,fs) (cgbase(c,fs) + (fs)->fs_iblkno) /* inode blk */ -#define cgdmin(c,fs) (cgbase(c,fs) + (fs)->fs_dblkno) /* 1st data */ +#define ino_to_cg(fs, x) ((x) / (fs)->fs_ipg) +#define ino_to_fsba(fs, x) \ + ((daddr_t)(cgimin(fs, ino_to_cg(fs, x)) + \ + (blkstofrags((fs), (((x) % (fs)->fs_ipg) / INOPB(fs)))))) +#define ino_to_fsbo(fs, x) ((x) % INOPB(fs)) /* - * 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 + * Give cylinder group number for a file system block. + * Give cylinder group block number for a file system block. */ -#define itoo(x,fs) ((x) % INOPB(fs)) -#define itog(x,fs) ((x) / (fs)->fs_ipg) -#define itod(x,fs) \ - ((daddr_t)(cgimin(itog(x,fs),fs) + \ - (x) % (fs)->fs_ipg / INOPB(fs) * (fs)->fs_frag)) +#define dtog(fs, d) ((d) / (fs)->fs_fpg) +#define dtogd(fs, d) ((d) % (fs)->fs_fpg) /* - * give cylinder group number for a file system block - * give cylinder group block number for a file system block + * Extract the bits for a block from a map. + * Compute the cylinder and rotational position of a cyl block addr. */ -#define dtog(d,fs) ((d) / (fs)->fs_fpg) -#define dtogd(d,fs) ((d) % (fs)->fs_fpg) +#define blkmap(fs, map, loc) \ + (((map)[(loc) / NBBY] >> ((loc) % NBBY)) & (0xff >> (NBBY - (fs)->fs_frag))) +#define cbtocylno(fs, bno) \ + ((bno) * NSPF(fs) / (fs)->fs_spc) +#define cbtorpos(fs, bno) \ + (((bno) * NSPF(fs) % (fs)->fs_spc / (fs)->fs_nsect * (fs)->fs_trackskew + \ + (bno) * NSPF(fs) % (fs)->fs_spc % (fs)->fs_nsect * (fs)->fs_interleave) % \ + (fs)->fs_nsect * (fs)->fs_nrpos / (fs)->fs_npsect) /* - * compute the cylinder and rotational position of a cyl block addr + * The following macros optimize certain frequently calculated + * quantities by using shifts and masks in place of divisions + * modulos and multiplications. */ -#define cbtocylno(fs, bno) \ - ((bno) * NSPF(fs) / (fs)->fs_spc) -#define cbtorpos(fs, bno) \ - ((bno) * NSPF(fs) % (fs)->fs_nsect * NRPOS / (fs)->fs_nsect) +#define blkoff(fs, loc) /* calculates (loc % fs->fs_bsize) */ \ + ((loc) & (fs)->fs_qbmask) +#define fragoff(fs, loc) /* calculates (loc % fs->fs_fsize) */ \ + ((loc) & (fs)->fs_qfmask) +#define lblktosize(fs, blk) /* calculates (blk * fs->fs_bsize) */ \ + ((blk) << (fs)->fs_bshift) +#define lblkno(fs, loc) /* calculates (loc / fs->fs_bsize) */ \ + ((loc) >> (fs)->fs_bshift) +#define numfrags(fs, loc) /* calculates (loc / fs->fs_fsize) */ \ + ((loc) >> (fs)->fs_fshift) +#define blkroundup(fs, size) /* calculates roundup(size, fs->fs_bsize) */ \ + (((size) + (fs)->fs_qbmask) & (fs)->fs_bmask) +#define fragroundup(fs, size) /* calculates roundup(size, fs->fs_fsize) */ \ + (((size) + (fs)->fs_qfmask) & (fs)->fs_fmask) +#define fragstoblks(fs, frags) /* calculates (frags / fs->fs_frag) */ \ + ((frags) >> (fs)->fs_fragshift) +#define blkstofrags(fs, blks) /* calculates (blks * fs->fs_frag) */ \ + ((blks) << (fs)->fs_fragshift) +#define fragnum(fs, fsb) /* calculates (fsb % fs->fs_frag) */ \ + ((fsb) & ((fs)->fs_frag - 1)) +#define blknum(fs, fsb) /* calculates rounddown(fsb, fs->fs_frag) */ \ + ((fsb) &~ ((fs)->fs_frag - 1)) + +/* + * Determine the number of available frags given a + * percentage to hold in reserve + */ +#define freespace(fs, percentreserved) \ + (blkstofrags((fs), (fs)->fs_cstotal.cs_nbfree) + \ + (fs)->fs_cstotal.cs_nffree - ((fs)->fs_dsize * (percentreserved) / 100)) /* - * determining the size of a file block in the file system + * Determining the size of a file block in the file system. */ #define blksize(fs, ip, lbn) \ - (((lbn) >= NDADDR || (ip)->i_size >= ((lbn) + 1) * (fs)->fs_bsize) \ - ? (fs)->fs_bsize \ - : (roundup((ip)->i_size % (fs)->fs_bsize, (fs)->fs_fsize))) + (((lbn) >= NDADDR || (ip)->i_size >= ((lbn) + 1) << (fs)->fs_bshift) \ + ? (fs)->fs_bsize \ + : (fragroundup(fs, blkoff(fs, (ip)->i_size)))) #define dblksize(fs, dip, lbn) \ - (((lbn) >= NDADDR || (dip)->di_size >= ((lbn) + 1) * (fs)->fs_bsize) \ - ? (fs)->fs_bsize \ - : (roundup((dip)->di_size % (fs)->fs_bsize, (fs)->fs_fsize))) + (((lbn) >= NDADDR || (dip)->di_size >= ((lbn) + 1) << (fs)->fs_bshift) \ + ? (fs)->fs_bsize \ + : (fragroundup(fs, blkoff(fs, (dip)->di_size)))) /* - * number of disk sectors per block; assumes DEV_BSIZE byte sector size + * Number of disk sectors per block; assumes DEV_BSIZE byte sector size. */ -#define NSPB(fs) ((fs)->fs_bsize / DEV_BSIZE) -#define NSPF(fs) ((fs)->fs_fsize / DEV_BSIZE) +#define NSPB(fs) ((fs)->fs_nspf << (fs)->fs_fragshift) +#define NSPF(fs) ((fs)->fs_nspf) /* - * INOPB is the number of inodes in a secondary storage block + * INOPB is the number of inodes in a secondary storage block. */ -#define INOPB(fs) ((fs)->fs_bsize / sizeof (struct dinode)) -#define INOPF(fs) ((fs)->fs_fsize / sizeof (struct dinode)) +#define INOPB(fs) ((fs)->fs_inopb) +#define INOPF(fs) ((fs)->fs_inopb >> (fs)->fs_fragshift) /* - * NINDIR is the number of indirects in a file system block + * NINDIR is the number of indirects in a file system block. */ -#define NINDIR(fs) ((fs)->fs_bsize / sizeof (daddr_t)) +#define NINDIR(fs) ((fs)->fs_nindir) -#ifdef KERNEL -struct fs *getfs(); -#endif +extern int inside[], around[]; +extern u_char *fragtbl[];