/* $NetBSD: lfs.c,v 1.21 2000/11/23 23:09:57 perseant Exp $ */ /*- * Copyright (c) 1991, 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. */ #include #ifndef lint #if 0 static char sccsid[] = "@(#)lfs.c 8.5 (Berkeley) 5/24/95"; #else __RCSID("$NetBSD: lfs.c,v 1.21 2000/11/23 23:09:57 perseant Exp $"); #endif #endif /* not lint */ #include #define FSTYPENAMES #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "config.h" #include "extern.h" extern int Nflag; /* Don't write anything */ daddr_t *ifib = NULL; /* Ifile single indirect block (lbn -NDADDR) */ /* * This table is indexed by the log base 2 of the block size. * It returns the maximum file size allowed in a file system * with the specified block size. For block sizes smaller than * 8K, the size is limited by tha maximum number of blocks that * can be reached by triply indirect blocks: * NDADDR + INOPB(bsize) + INOPB(bsize)^2 + INOPB(bsize)^3 * For block size of 8K or larger, the file size is limited by the * number of blocks that can be represented in the file system. Since * we use negative block numbers to represent indirect blocks, we can * have a maximum of 2^31 blocks. */ u_quad_t maxtable[] = { /* 1 */ -1, /* 2 */ -1, /* 4 */ -1, /* 8 */ -1, /* 16 */ -1, /* 32 */ -1, /* 64 */ -1, /* 128 */ -1, /* 256 */ -1, /* 512 */ NDADDR + 128 + 128 * 128 + 128 * 128 * 128, /* 1024 */ NDADDR + 256 + 256 * 256 + 256 * 256 * 256, /* 2048 */ NDADDR + 512 + 512 * 512 + 512 * 512 * 512, /* 4096 */ NDADDR + 1024 + 1024 * 1024 + 1024 * 1024 * 1024, /* 8192 */ 1 << 31, /* 16 K */ 1 << 31, /* 32 K */ 1 << 31, }; static struct lfs lfs_default = { { /* lfs_dlfs */ /* dlfs_magic */ LFS_MAGIC, /* dlfs_version */ LFS_VERSION, /* dlfs_size */ 0, /* dlfs_ssize */ DFL_LFSSEG/DFL_LFSBLOCK, /* dlfs_dsize */ 0, /* dlfs_bsize */ DFL_LFSBLOCK, /* dlfs_fsize */ DFL_LFSFRAG, /* dlfs_frag */ DFL_LFSBLOCK/DFL_LFSFRAG, /* dlfs_free */ LFS_FIRST_INUM, /* dlfs_bfree */ 0, /* dlfs_nfiles */ 0, /* dlfs_avail */ 0, /* dlfs_uinodes */ 0, /* dlfs_idaddr */ 0, /* dlfs_ifile */ LFS_IFILE_INUM, /* dlfs_lastseg */ 0, /* dlfs_nextseg */ 0, /* dlfs_curseg */ 0, /* dlfs_offset */ 0, /* dlfs_lastpseg */ 0, /* dlfs_tstamp */ 0, /* dlfs_minfree */ MINFREE, /* dlfs_maxfilesize */ 0, /* dlfs_dbpseg */ DFL_LFSSEG/DEV_BSIZE, /* dlfs_inopb */ DFL_LFSBLOCK/sizeof(struct dinode), /* dlfs_ifpb */ DFL_LFSBLOCK/sizeof(IFILE), /* dlfs_sepb */ DFL_LFSBLOCK/sizeof(SEGUSE), /* dlfs_nindir */ DFL_LFSBLOCK/sizeof(daddr_t), /* dlfs_nseg */ 0, /* dlfs_nspf */ 0, /* dlfs_cleansz */ 0, /* dlfs_segtabsz */ 0, /* dlfs_segmask */ DFL_LFSSEG_MASK, /* dlfs_segshift */ DFL_LFSSEG_SHIFT, /* dlfs_bshift */ DFL_LFSBLOCK_SHIFT, /* dlfs_ffshift */ DFL_LFS_FFSHIFT, /* dlfs_fbshift */ DFL_LFS_FBSHIFT, /* dlfs_bmask */ DFL_LFSBLOCK_MASK, /* dlfs_ffmask */ DFL_LFS_FFMASK, /* dlfs_fbmask */ DFL_LFS_FBMASK, /* dlfs_fsbtodb */ 0, /* dlfs_sushift */ 0, /* dlfs_maxsymlinklen */ MAXSYMLINKLEN, /* dlfs_sboffs */ { 0 }, /* dlfs_nclean */ 0, /* dlfs_fsmnt */ { 0 }, /* dlfs_clean */ 0, /* dlfs_dmeta */ 0, /* dlfs_minfreeseg */ 0, /* dlfs_pad */ { 0 }, /* dlfs_cksum */ 0 }, /* lfs_sp */ NULL, /* lfs_ivnode */ NULL, /* lfs_seglock */ 0, /* lfs_lockpid */ 0, /* lfs_iocount */ 0, /* lfs_writer */ 0, /* lfs_dirops */ 0, /* lfs_doifile */ 0, /* lfs_nactive */ 0, /* lfs_fmod */ 0, /* lfs_ronly */ 0, /* lfs_flags */ 0 }; #define UMASK 0755 struct direct lfs_root_dir[] = { { ROOTINO, sizeof(struct direct), DT_DIR, 1, "."}, { ROOTINO, sizeof(struct direct), DT_DIR, 2, ".."}, { LFS_IFILE_INUM, sizeof(struct direct), DT_REG, 5, "ifile"}, { LOSTFOUNDINO, sizeof(struct direct), DT_DIR, 10, "lost+found"}, }; struct direct lfs_lf_dir[] = { { LOSTFOUNDINO, sizeof(struct direct), DT_DIR, 1, "." }, { ROOTINO, sizeof(struct direct), DT_DIR, 2, ".." }, }; static daddr_t make_dinode __P((ino_t, struct dinode *, int, daddr_t, struct lfs *)); static void make_dir __P(( void *, struct direct *, int)); static void put __P((int, off_t, void *, size_t)); int make_lfs(fd, lp, partp, minfree, block_size, frag_size, seg_size, minfreeseg) int fd; struct disklabel *lp; struct partition *partp; int minfree; int block_size; int frag_size; int seg_size; int minfreeseg; { struct dinode *dip; /* Pointer to a disk inode */ struct dinode *dpagep; /* Pointer to page of disk inodes */ CLEANERINFO *cleaninfo; /* Segment cleaner information table */ FINFO file_info; /* File info structure in summary blocks */ IFILE *ifile; /* Pointer to array of ifile structures */ IFILE *ip; /* Pointer to array of ifile structures */ struct lfs *lfsp; /* Superblock */ SEGUSE *segp; /* Segment usage table */ SEGUSE *segtable; /* Segment usage table */ SEGSUM summary; /* Segment summary structure */ SEGSUM *sp; /* Segment summary pointer */ daddr_t last_sb_addr; /* Address of superblocks */ daddr_t sb_addr; /* Address of superblocks */ daddr_t seg_addr; /* Address of current segment */ char *ipagep; /* Pointer to the page we use to write stuff */ char *sump; /* Used to copy stuff into segment buffer */ ufs_daddr_t *block_array; /* Array of logical block nos to put in sum */ u_long blocks_used; /* Number of blocks in first segment */ u_long *dp; /* Used to computed checksum on data */ u_long *datasump; /* Used to computed checksum on data */ int block_array_size; /* How many entries in block array */ int bsize; /* Block size */ int fsize; /* Fragment size */ int db_per_fb; /* Disk blocks per file block */ int i, j; off_t off; /* Offset at which to write */ int sb_interval; /* number of segs between super blocks */ off_t seg_seek; /* Seek offset for a segment */ int ssize; /* Segment size */ int sum_size; /* Size of the summary block */ int warned_segtoobig=0; lfsp = &lfs_default; /* If partition is not an LFS partition, warn that that is the case */ if(partp->p_fstype != FS_BSDLFS) { fatal("partition label indicated fs type \"%s\", expected \"%s\"", fstypenames[partp->p_fstype], fstypenames[FS_BSDLFS]); } if (!(bsize = block_size)) if (!(bsize = partp->p_fsize * partp->p_frag)) bsize = DFL_LFSBLOCK; if (!(fsize = frag_size)) if (!(fsize = partp->p_fsize)) fsize = DFL_LFSFRAG; if (!(ssize = seg_size)) if (partp->p_sgs == 0 || !(ssize = (partp->p_fsize * partp->p_frag) << partp->p_sgs)) { ssize = DFL_LFSSEG; } /* Sanity check: fsize<=bsize bsize) { /* Only complain if fsize was explicitly set */ if(frag_size) fatal("fragment size must be <= block size %d", bsize); fsize = bsize; } if (bsize >= ssize) { /* Only fatal if ssize was explicitly set */ if(seg_size) fatal("block size must be < segment size"); warnx("%s: disklabel segment size (%d) too small, using default (%d)", progname, ssize, DFL_LFSSEG); ssize = DFL_LFSSEG; } tryagain: /* Modify parts of superblock overridden by command line arguments */ if (bsize != DFL_LFSBLOCK || fsize != DFL_LFSFRAG) { lfsp->lfs_bshift = log2(bsize); if (1 << lfsp->lfs_bshift != bsize) fatal("%d: block size not a power of 2", bsize); lfsp->lfs_bsize = bsize; lfsp->lfs_fsize = fsize; lfsp->lfs_bmask = bsize - 1; lfsp->lfs_inopb = bsize / sizeof(struct dinode); lfsp->lfs_ffmask = fsize - 1; lfsp->lfs_ffshift = log2(fsize); if (1 << lfsp->lfs_ffshift != fsize) fatal("%d: frag size not a power of 2", fsize); lfsp->lfs_frag = numfrags(lfsp, bsize); lfsp->lfs_fbmask = lfsp->lfs_frag - 1; lfsp->lfs_fbshift = log2(lfsp->lfs_frag); /* MIS -- should I round to power of 2 */ lfsp->lfs_ifpb = bsize / sizeof(IFILE); lfsp->lfs_sepb = bsize / sizeof(SEGUSE); lfsp->lfs_nindir = bsize / sizeof(daddr_t); } if (ssize != DFL_LFSSEG) { lfsp->lfs_segshift = log2(ssize); if (1 << lfsp->lfs_segshift != ssize) fatal("%d: segment size not power of 2", ssize); lfsp->lfs_ssize = ssize; lfsp->lfs_segmask = ssize - 1; lfsp->lfs_dbpseg = ssize / DEV_BSIZE; } lfsp->lfs_ssize = ssize >> lfsp->lfs_bshift; lfsp->lfs_minfree = minfree; /* * Fill in parts of superblock that can be computed from file system * size, disk geometry and current time. */ db_per_fb = bsize/lp->d_secsize; lfsp->lfs_fsbtodb = log2(db_per_fb); lfsp->lfs_sushift = log2(lfsp->lfs_sepb); lfsp->lfs_size = partp->p_size >> lfsp->lfs_fsbtodb; lfsp->lfs_dsize = lfsp->lfs_size - (LFS_LABELPAD >> lfsp->lfs_bshift); lfsp->lfs_nseg = lfsp->lfs_dsize / lfsp->lfs_ssize; lfsp->lfs_nclean = lfsp->lfs_nseg - 1; lfsp->lfs_maxfilesize = maxtable[lfsp->lfs_bshift] << lfsp->lfs_bshift; if (minfreeseg == 0) lfsp->lfs_minfreeseg = lfsp->lfs_nseg / DFL_MIN_FREE_SEGS; else lfsp->lfs_minfreeseg = minfreeseg; if (lfsp->lfs_minfreeseg < MIN_FREE_SEGS) lfsp->lfs_minfreeseg = MIN_FREE_SEGS; if(lfsp->lfs_nseg < lfsp->lfs_minfreeseg + 1 || lfsp->lfs_nseg < LFS_MIN_SBINTERVAL + 1) { if(seg_size == 0 && ssize > (bsize<<1)) { if(!warned_segtoobig) { fprintf(stderr,"Segment size %d is too large; trying smaller sizes.\n", ssize); if (ssize == (bsize << 16)) { fprintf(stderr, "(Did you perhaps accidentally leave \"16\" in the disklabel's sgs field?)\n"); } } ++warned_segtoobig; ssize >>= 1; goto tryagain; } fatal("Could not allocate enough segments with segment size %d and block size %d;\nplease decrease the segment size.\n", ssize, lfsp->lfs_bsize); } printf("%.1fMB in %d segments of size %d\n", (lfsp->lfs_nseg * (double)ssize) / 1048576.0, lfsp->lfs_nseg, ssize); /* * The number of free blocks is set from the number of segments * times the segment size - lfs_minfreesegs (that we never write * because we need to make sure the cleaner can run). Then * we'll subtract off the room for the superblocks ifile entries * and segment usage table, and half a block per segment that can't * be written due to fragmentation. */ lfsp->lfs_dsize = (lfsp->lfs_nseg - lfsp->lfs_minfreeseg) * fsbtodb(lfsp, lfsp->lfs_ssize); lfsp->lfs_bfree = lfsp->lfs_dsize; lfsp->lfs_bfree -= fsbtodb(lfsp, lfsp->lfs_nseg / 2); lfsp->lfs_segtabsz = SEGTABSIZE_SU(lfsp); lfsp->lfs_cleansz = CLEANSIZE_SU(lfsp); if ((lfsp->lfs_tstamp = time(NULL)) == -1) fatal("time: %s", strerror(errno)); if ((sb_interval = lfsp->lfs_nseg / LFS_MAXNUMSB) < LFS_MIN_SBINTERVAL) sb_interval = LFS_MIN_SBINTERVAL; /* To start, one inode block and one segsum are dirty metadata */ lfsp->lfs_dmeta = 1 + fsbtodb(lfsp, 1); /* * Now, lay out the file system. We need to figure out where * the superblocks go, initialize the checkpoint information * for the first two superblocks, initialize the segment usage * information, put the segusage information in the ifile, create * the first block of IFILE structures, and link all the IFILE * structures into a free list. */ /* Figure out where the superblocks are going to live */ lfsp->lfs_sboffs[0] = btodb(LFS_LABELPAD); lfsp->lfs_dsize -= btodb(LFS_SBPAD); for (i = 1; i < LFS_MAXNUMSB; i++) { sb_addr = ((i * sb_interval) << (lfsp->lfs_segshift - lfsp->lfs_bshift + lfsp->lfs_fsbtodb)) + lfsp->lfs_sboffs[0]; if (sb_addr > partp->p_size) break; lfsp->lfs_sboffs[i] = sb_addr; lfsp->lfs_dsize -= btodb(LFS_SBPAD); } /* We need >= 2 superblocks */ if(lfsp->lfs_sboffs[1] == 0x0) { fatal("Could not assign a disk adress for the second superblock.\nPlease decrease the segment size.\n"); } last_sb_addr = lfsp->lfs_sboffs[i - 1]; lfsp->lfs_lastseg = lfsp->lfs_sboffs[0]; lfsp->lfs_nextseg = lfsp->lfs_sboffs[1] ? lfsp->lfs_sboffs[1] : lfsp->lfs_sboffs[0]; lfsp->lfs_curseg = lfsp->lfs_lastseg; /* * Initialize the segment usage table. The first segment will * contain the superblock, the cleanerinfo (cleansz), the segusage * table (segtabsz), 1 block's worth of IFILE entries, the root * directory, the lost+found directory and one block's worth of * inodes (containing the ifile, root, and l+f inodes). */ if (!(cleaninfo = malloc(lfsp->lfs_cleansz << lfsp->lfs_bshift))) fatal("%s", strerror(errno)); cleaninfo->clean = lfsp->lfs_nseg - 1; cleaninfo->dirty = 1; if (!(segtable = malloc(lfsp->lfs_segtabsz << lfsp->lfs_bshift))) fatal("%s", strerror(errno)); segp = segtable; blocks_used = lfsp->lfs_segtabsz + lfsp->lfs_cleansz + 4; segp->su_nbytes = ((lfsp->lfs_segtabsz + lfsp->lfs_cleansz + 1) << lfsp->lfs_bshift) + 2 * roundup(DIRBLKSIZ,lfsp->lfs_fsize) + 3 * DINODE_SIZE; segp->su_lastmod = lfsp->lfs_tstamp; segp->su_nsums = 1; /* 1 summary blocks */ segp->su_ninos = 1; /* 1 inode block */ segp->su_flags = SEGUSE_SUPERBLOCK | SEGUSE_DIRTY; lfsp->lfs_bfree -= btodb(LFS_SUMMARY_SIZE); lfsp->lfs_bfree -= fsbtodb(lfsp, lfsp->lfs_cleansz + lfsp->lfs_segtabsz + 4); /* * Now figure out the address of the ifile inode. The inode block * appears immediately after the segment summary. */ lfsp->lfs_idaddr = (LFS_LABELPAD + LFS_SBPAD + LFS_SUMMARY_SIZE) / lp->d_secsize; j = 1; for (segp = segtable + 1, i = 1; i < lfsp->lfs_nseg; i++, segp++) { if ((i % sb_interval) == 0 && j < LFS_MAXNUMSB) { segp->su_flags = SEGUSE_SUPERBLOCK; lfsp->lfs_bfree -= (LFS_SBPAD / lp->d_secsize); ++j; } else segp->su_flags = 0; segp->su_lastmod = 0; segp->su_nbytes = 0; segp->su_ninos = 0; segp->su_nsums = 0; } /* * Initialize dynamic accounting. */ lfsp->lfs_uinodes = 0; /* * Ready to start writing segments. The first segment is different * because it contains the segment usage table and the ifile inode * as well as a superblock. For the rest of the segments, set the * time stamp to be 0 so that the first segment is the most recent. * For each segment that is supposed to contain a copy of the super * block, initialize its first few blocks and its segment summary * to indicate this. */ lfsp->lfs_nfiles = LFS_FIRST_INUM - 1; /* Now create a block of disk inodes */ if (!(dpagep = malloc(lfsp->lfs_bsize))) fatal("%s", strerror(errno)); dip = (struct dinode *)dpagep; memset(dip, 0, lfsp->lfs_bsize); /* Create a block of IFILE structures. */ if (!(ipagep = (char *)malloc(lfsp->lfs_bsize))) fatal("%s", strerror(errno)); ifile = (IFILE *)ipagep; /* * Initialize IFILE. It is the next block following the * block of inodes (whose address has been calculated in * lfsp->lfs_idaddr; */ sb_addr = lfsp->lfs_idaddr + lfsp->lfs_bsize / lp->d_secsize; sb_addr = make_dinode(LFS_IFILE_INUM, dip, (lfsp->lfs_cleansz + lfsp->lfs_segtabsz+1)<lfs_fbshift, sb_addr, lfsp); dip->di_mode = IFREG|IREAD|IWRITE; dip->di_flags = SF_IMMUTABLE; /* XXX KS */ ip = &ifile[LFS_IFILE_INUM]; ip->if_version = 1; ip->if_daddr = lfsp->lfs_idaddr; /* Initialize the ROOT Directory */ sb_addr = make_dinode(ROOTINO, ++dip, howmany(DIRBLKSIZ,lfsp->lfs_fsize), sb_addr, lfsp); dip->di_mode = IFDIR | UMASK; dip->di_size = DIRBLKSIZ; dip->di_blocks = howmany(roundup(DIRBLKSIZ,lfsp->lfs_fsize),DEV_BSIZE); dip->di_nlink = 3; ip = &ifile[ROOTINO]; ip->if_version = 1; ip->if_daddr = lfsp->lfs_idaddr; /* Initialize the lost+found Directory */ sb_addr = make_dinode(LOSTFOUNDINO, ++dip, howmany(DIRBLKSIZ,lfsp->lfs_fsize), sb_addr, lfsp); dip->di_mode = IFDIR | UMASK; dip->di_size = DIRBLKSIZ; dip->di_blocks = howmany(roundup(DIRBLKSIZ,lfsp->lfs_fsize),DEV_BSIZE); dip->di_nlink = 2; ip = &ifile[LOSTFOUNDINO]; ip->if_version = 1; ip->if_daddr = lfsp->lfs_idaddr; /* Make all the other dinodes invalid */ for (i = INOPB(lfsp)-3, dip++; i; i--, dip++) dip->di_inumber = LFS_UNUSED_INUM; /* Link remaining IFILE entries in free list */ for (ip = &ifile[LFS_FIRST_INUM], i = LFS_FIRST_INUM; i < lfsp->lfs_ifpb; ++ip) { ip->if_version = 1; ip->if_daddr = LFS_UNUSED_DADDR; ip->if_nextfree = ++i; } ifile[lfsp->lfs_ifpb - 1].if_nextfree = LFS_UNUSED_INUM; /* Now, write the segment */ /* Adjust blocks_used to take indirect block into account */ if(ifib) { ++blocks_used; segtable[0].su_nbytes += lfsp->lfs_bsize; } /* Compute a checksum across all the data you're writing */ dp = datasump = malloc (blocks_used * sizeof(u_long)); *dp++ = ((u_long *)dpagep)[0]; /* inode block */ for (i = 0; i < lfsp->lfs_cleansz; i++) *dp++ = ((u_long *)cleaninfo)[(i << lfsp->lfs_bshift) / sizeof(u_long)]; /* Cleaner info */ for (i = 0; i < lfsp->lfs_segtabsz; i++) *dp++ = ((u_long *)segtable)[(i << lfsp->lfs_bshift) / sizeof(u_long)]; /* Segusage table */ *dp++ = ((u_long *)ifile)[0]; /* Ifile */ /* Still need the root and l+f bytes; get them later */ /* Write out the inode block */ off = LFS_LABELPAD + LFS_SBPAD + LFS_SUMMARY_SIZE; put(fd, off, dpagep, lfsp->lfs_bsize); off += lfsp->lfs_bsize; /* Write out the ifile */ put(fd, off, cleaninfo, lfsp->lfs_cleansz << lfsp->lfs_bshift); off += (lfsp->lfs_cleansz << lfsp->lfs_bshift); (void)free(cleaninfo); put(fd, off, segtable, lfsp->lfs_segtabsz << lfsp->lfs_bshift); off += (lfsp->lfs_segtabsz << lfsp->lfs_bshift); (void)free(segtable); put(fd, off, ifile, lfsp->lfs_bsize); off += lfsp->lfs_bsize; /* XXX KS - write the single indirect block */ if(ifib) { *dp++ = ((u_long *)ifib)[0]; put(fd, off, ifib, lfsp->lfs_bsize); off += lfsp->lfs_bsize; } /* * use ipagep for space for writing out other stuff. It used to * contain the ifile, but we're done with it. */ /* Write out the root and lost and found directories */ memset(ipagep, 0, lfsp->lfs_bsize); make_dir(ipagep, lfs_root_dir, sizeof(lfs_root_dir) / sizeof(struct direct)); *dp++ = ((u_long *)ipagep)[0]; dip = ((struct dinode *)dpagep) + 1; put(fd, off, ipagep, dblksize(lfsp,dip,0)); off += dblksize(lfsp,dip,0); memset(ipagep, 0, lfsp->lfs_bsize); make_dir(ipagep, lfs_lf_dir, sizeof(lfs_lf_dir) / sizeof(struct direct)); *dp++ = ((u_long *)ipagep)[0]; dip = ((struct dinode *)dpagep) + 2; put(fd, off, ipagep, dblksize(lfsp,dip,0)); off += dblksize(lfsp,dip,0); /* Write Superblock */ lfsp->lfs_offset = off / lp->d_secsize; lfsp->lfs_avail = lfsp->lfs_dsize - (fsbtodb(lfsp, lfsp->lfs_ssize) - btodb(LFS_SBPAD) - (sntoda(lfsp, 1) - lfsp->lfs_offset)); lfsp->lfs_bfree = lfsp->lfs_avail; /* XXX */ /* Slop for an imperfect cleaner */ lfsp->lfs_avail += (lfsp->lfs_minfreeseg / 2) * fsbtodb(lfsp, lfsp->lfs_ssize); lfsp->lfs_cksum = lfs_sb_cksum(&(lfsp->lfs_dlfs)); put(fd, (off_t)LFS_LABELPAD, &(lfsp->lfs_dlfs), sizeof(struct dlfs)); /* * Finally, calculate all the fields for the summary structure * and write it. */ memset(&summary,0,sizeof(summary)); summary.ss_next = lfsp->lfs_nextseg; summary.ss_create = lfsp->lfs_tstamp; summary.ss_nfinfo = 3; summary.ss_ninos = 3; summary.ss_magic = SS_MAGIC; summary.ss_datasum = cksum(datasump, sizeof(u_long) * blocks_used); /* * Make sure that we don't overflow a summary block. We have to * record: FINFO structures for ifile, root, and l+f. The number * of blocks recorded for the ifile is determined by the size of * the cleaner info and the segments usage table. There is room * for one block included in sizeof(FINFO) so we don't need to add * any extra space for the ROOT and L+F, and one block of the ifile * is already counted. Finally, we leave room for 1 inode block * address. */ sum_size = 3*sizeof(FINFO) + sizeof(SEGSUM) + 2*sizeof(daddr_t) + (lfsp->lfs_cleansz + lfsp->lfs_segtabsz) * sizeof(ufs_daddr_t); #define SUMERR \ "Multiple summary blocks in segment 1 not yet implemented\nsummary is %d bytes." if (sum_size > LFS_SUMMARY_SIZE) fatal(SUMERR, sum_size); block_array_size = lfsp->lfs_cleansz + lfsp->lfs_segtabsz + 1; if (block_array_size > NDADDR) block_array_size++; if (!(block_array = malloc(block_array_size *sizeof(int)))) fatal("%s: %s", special, strerror(errno)); /* fill in the array */ for (i = 0; i < block_array_size; i++) block_array[i] = i; if (block_array_size > NDADDR) block_array[block_array_size-1] = -NDADDR; /* copy into segment */ sump = ipagep; memcpy(sump, &summary, sizeof(SEGSUM)); sump += sizeof(SEGSUM); /* Now, add the ifile */ file_info.fi_nblocks = block_array_size; file_info.fi_version = 1; file_info.fi_lastlength = lfsp->lfs_bsize; file_info.fi_ino = LFS_IFILE_INUM; memmove(sump, &file_info, sizeof(FINFO) - sizeof(ufs_daddr_t)); sump += sizeof(FINFO) - sizeof(ufs_daddr_t); memmove(sump, block_array, sizeof(ufs_daddr_t) * file_info.fi_nblocks); sump += sizeof(ufs_daddr_t) * file_info.fi_nblocks; /* Now, add the root directory */ dip = ((struct dinode *)dpagep) + 1; file_info.fi_nblocks = 1; file_info.fi_version = 1; file_info.fi_ino = ROOTINO; file_info.fi_blocks[0] = 0; file_info.fi_lastlength = dblksize(lfsp, dip, 0); memmove(sump, &file_info, sizeof(FINFO)); sump += sizeof(FINFO); /* Now, add the lost and found */ dip = ((struct dinode *)dpagep) + 2; file_info.fi_ino = LOSTFOUNDINO; file_info.fi_lastlength = dblksize(lfsp, dip, 0); memmove(sump, &file_info, sizeof(FINFO)); ((daddr_t *)ipagep)[LFS_SUMMARY_SIZE / sizeof(daddr_t) - 1] = lfsp->lfs_idaddr; ((SEGSUM *)ipagep)->ss_sumsum = cksum(ipagep+sizeof(summary.ss_sumsum), LFS_SUMMARY_SIZE - sizeof(summary.ss_sumsum)); put(fd, (off_t)LFS_LABELPAD + LFS_SBPAD, ipagep, LFS_SUMMARY_SIZE); sp = (SEGSUM *)ipagep; sp->ss_create = 0; sp->ss_nfinfo = 0; sp->ss_ninos = 0; sp->ss_datasum = 0; sp->ss_magic = SS_MAGIC; free(dpagep); /* Now write the summary block for the next partial so it's invalid */ sp->ss_sumsum = cksum(&sp->ss_datasum, LFS_SUMMARY_SIZE - sizeof(sp->ss_sumsum)); put(fd, off, sp, LFS_SUMMARY_SIZE); /* Now, write the rest of the superblocks */ lfsp->lfs_cksum = lfs_sb_cksum(&(lfsp->lfs_dlfs)); printf("super-block backups (for fsck -b #) at:\n"); for (i = 0; i < LFS_MAXNUMSB; i++) { seg_addr = lfsp->lfs_sboffs[i]; printf("%d%s ", seg_addr, (i == LFS_MAXNUMSB - 1 ? "" : ",")); /* Leave the time stamp on the alt sb, zero the rest */ if(i == 2) { lfsp->lfs_tstamp = 0; lfsp->lfs_cksum = lfs_sb_cksum(&(lfsp->lfs_dlfs)); } seg_seek = (off_t)seg_addr * lp->d_secsize; put(fd, seg_seek, &(lfsp->lfs_dlfs), sizeof(struct dlfs)); } printf("\n"); free(ipagep); close(fd); return (0); } static void put(fd, off, p, len) int fd; off_t off; void *p; size_t len; { int wbytes; if (Nflag) return; if (lseek(fd, off, SEEK_SET) < 0) fatal("%s: seek: %s", special, strerror(errno)); if ((wbytes = write(fd, p, len)) < 0) fatal("%s: write: %s", special, strerror(errno)); if (wbytes != len) fatal("%s: short write (%d, not %ld)", special, wbytes, (u_long) len); } /* * Create the root directory for this file system and the lost+found * directory. */ static daddr_t make_dinode(ino, dip, nfrags, saddr, lfsp) ino_t ino; /* inode we're creating */ struct dinode *dip; /* disk inode */ int nfrags; /* number of frags in file */ daddr_t saddr; /* starting block address */ struct lfs *lfsp; /* superblock */ { int db_per_fb, i; int nblocks; nblocks = howmany(nfrags, lfsp->lfs_frag); if(nblocks >= NDADDR) nfrags = roundup(nfrags, lfsp->lfs_frag); dip->di_nlink = 1; dip->di_blocks = fragstodb(lfsp, nfrags); dip->di_size = (nfrags << lfsp->lfs_ffshift); dip->di_atime = dip->di_mtime = dip->di_ctime = lfsp->lfs_tstamp; dip->di_atimensec = dip->di_mtimensec = dip->di_ctimensec = 0; dip->di_inumber = ino; dip->di_gen = 1; db_per_fb = 1 << lfsp->lfs_fsbtodb; #if 0 if (NDADDR < nblocks) fatal("File ino=%d requires more than the number of direct blocks; please increase block or segment size.",ino); #else if (NDADDR+NINDIR(lfsp) < nblocks) { fatal("File ino=%d requires more blocks than can be accommodated with a single indirect block; please increase segment or block size.",ino); } else if (NDADDR < nblocks) { fprintf(stderr,"Using %d single indirect block(s) for inode %d\n", (nblocks-NDADDR)/NINDIR(lfsp) + 1, ino); dip->di_blocks += db_per_fb; } #endif /* Assign the block addresses for the ifile */ for (i = 0; i < MIN(nblocks,NDADDR); i++, saddr += db_per_fb) { dip->di_db[i] = saddr; } if (nfrags & lfsp->lfs_fbmask) { /* Last block is a fragment */ saddr -= db_per_fb - fragstodb(lfsp, nfrags & lfsp->lfs_fbmask); } /* XXX We are only called with nblocks > 1 for Ifile */ if(ino == LFS_IFILE_INUM && nblocks > NDADDR) { ifib = (daddr_t *)malloc(lfsp->lfs_bsize); memset(ifib,0,lfsp->lfs_bsize); for (i = 0; i < nblocks-NDADDR; i++, saddr += db_per_fb) ifib[i] = saddr; dip->di_ib[0] = saddr; saddr += db_per_fb; } return (saddr); } /* * Construct a set of directory entries in "bufp". We assume that all the * entries in protodir fir in the first DIRBLKSIZ. */ static void make_dir(bufp, protodir, entries) void *bufp; struct direct *protodir; int entries; { char *cp; int i, spcleft; spcleft = DIRBLKSIZ; for (cp = bufp, i = 0; i < entries - 1; i++) { protodir[i].d_reclen = DIRSIZ(NEWDIRFMT, &protodir[i], 0); memmove(cp, &protodir[i], protodir[i].d_reclen); cp += protodir[i].d_reclen; if ((spcleft -= protodir[i].d_reclen) < 0) fatal("%s: %s", special, "directory too big"); } protodir[i].d_reclen = spcleft; memmove(cp, &protodir[i], DIRSIZ(NEWDIRFMT, &protodir[i], 0)); }