/* $NetBSD: lfs.c,v 1.34 2011/06/21 09:36:46 mrg Exp $ */ /*- * Copyright (c) 2003 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Konrad E. Schroder . * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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. */ /* * Copyright (c) 1989, 1991, 1993 * The Regents of the University of California. All rights reserved. * (c) UNIX System Laboratories, Inc. * All or some portions of this file are derived from material licensed * to the University of California by American Telephone and Telegraph * Co. or Unix System Laboratories, Inc. and are reproduced herein with * the permission of UNIX System Laboratories, Inc. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)ufs_bmap.c 8.8 (Berkeley) 8/11/95 */ #include #include #include #include #include #include #include #define vnode uvnode #include #undef vnode #include #include #include #include #include #include #include #include #include #include "bufcache.h" #include "vnode.h" #include "lfs_user.h" #include "segwrite.h" #include "kernelops.h" #define panic call_panic extern u_int32_t cksum(void *, size_t); extern u_int32_t lfs_sb_cksum(struct dlfs *); extern void pwarn(const char *, ...); extern struct uvnodelst vnodelist; extern struct uvnodelst getvnodelist[VNODE_HASH_MAX]; extern int nvnodes; long dev_bsize = DEV_BSIZE; static int lfs_fragextend(struct uvnode *, int, int, daddr_t, struct ubuf **); int fsdirty = 0; void (*panic_func)(int, const char *, va_list) = my_vpanic; /* * LFS buffer and uvnode operations */ int lfs_vop_strategy(struct ubuf * bp) { int count; if (bp->b_flags & B_READ) { count = kops.ko_pread(bp->b_vp->v_fd, bp->b_data, bp->b_bcount, bp->b_blkno * dev_bsize); if (count == bp->b_bcount) bp->b_flags |= B_DONE; } else { count = kops.ko_pwrite(bp->b_vp->v_fd, bp->b_data, bp->b_bcount, bp->b_blkno * dev_bsize); if (count == 0) { perror("pwrite"); return -1; } bp->b_flags &= ~B_DELWRI; reassignbuf(bp, bp->b_vp); } return 0; } int lfs_vop_bwrite(struct ubuf * bp) { struct lfs *fs; fs = bp->b_vp->v_fs; if (!(bp->b_flags & B_DELWRI)) { fs->lfs_avail -= btofsb(fs, bp->b_bcount); } bp->b_flags |= B_DELWRI | B_LOCKED; reassignbuf(bp, bp->b_vp); brelse(bp, 0); return 0; } /* * ufs_bmaparray does the bmap conversion, and if requested returns the * array of logical blocks which must be traversed to get to a block. * Each entry contains the offset into that block that gets you to the * next block and the disk address of the block (if it is assigned). */ int ufs_bmaparray(struct lfs * fs, struct uvnode * vp, daddr_t bn, daddr_t * bnp, struct indir * ap, int *nump) { struct inode *ip; struct ubuf *bp; struct indir a[NIADDR + 1], *xap; daddr_t daddr; daddr_t metalbn; int error, num; ip = VTOI(vp); if (bn >= 0 && bn < NDADDR) { if (nump != NULL) *nump = 0; *bnp = fsbtodb(fs, ip->i_ffs1_db[bn]); if (*bnp == 0) *bnp = -1; return (0); } xap = ap == NULL ? a : ap; if (!nump) nump = # if ((error = ufs_getlbns(fs, vp, bn, xap, nump)) != 0) return (error); num = *nump; /* Get disk address out of indirect block array */ daddr = ip->i_ffs1_ib[xap->in_off]; for (bp = NULL, ++xap; --num; ++xap) { /* Exit the loop if there is no disk address assigned yet and * the indirect block isn't in the cache, or if we were * looking for an indirect block and we've found it. */ metalbn = xap->in_lbn; if ((daddr == 0 && !incore(vp, metalbn)) || metalbn == bn) break; /* * If we get here, we've either got the block in the cache * or we have a disk address for it, go fetch it. */ if (bp) brelse(bp, 0); xap->in_exists = 1; bp = getblk(vp, metalbn, fs->lfs_bsize); if (!(bp->b_flags & (B_DONE | B_DELWRI))) { bp->b_blkno = fsbtodb(fs, daddr); bp->b_flags |= B_READ; VOP_STRATEGY(bp); } daddr = ((ufs_daddr_t *) bp->b_data)[xap->in_off]; } if (bp) brelse(bp, 0); daddr = fsbtodb(fs, (ufs_daddr_t) daddr); *bnp = daddr == 0 ? -1 : daddr; return (0); } /* * Create an array of logical block number/offset pairs which represent the * path of indirect blocks required to access a data block. The first "pair" * contains the logical block number of the appropriate single, double or * triple indirect block and the offset into the inode indirect block array. * Note, the logical block number of the inode single/double/triple indirect * block appears twice in the array, once with the offset into the i_ffs1_ib and * once with the offset into the page itself. */ int ufs_getlbns(struct lfs * fs, struct uvnode * vp, daddr_t bn, struct indir * ap, int *nump) { daddr_t metalbn, realbn; int64_t blockcnt; int lbc; int i, numlevels, off; int lognindir, indir; metalbn = 0; /* XXXGCC -Wuninitialized [sh3] */ if (nump) *nump = 0; numlevels = 0; realbn = bn; if (bn < 0) bn = -bn; lognindir = -1; for (indir = fs->lfs_nindir; indir; indir >>= 1) ++lognindir; /* Determine the number of levels of indirection. After this loop is * done, blockcnt indicates the number of data blocks possible at the * given level of indirection, and NIADDR - i is the number of levels * of indirection needed to locate the requested block. */ bn -= NDADDR; for (lbc = 0, i = NIADDR;; i--, bn -= blockcnt) { if (i == 0) return (EFBIG); lbc += lognindir; blockcnt = (int64_t) 1 << lbc; if (bn < blockcnt) break; } /* Calculate the address of the first meta-block. */ metalbn = -((realbn >= 0 ? realbn : -realbn) - bn + NIADDR - i); /* At each iteration, off is the offset into the bap array which is an * array of disk addresses at the current level of indirection. The * logical block number and the offset in that block are stored into * the argument array. */ ap->in_lbn = metalbn; ap->in_off = off = NIADDR - i; ap->in_exists = 0; ap++; for (++numlevels; i <= NIADDR; i++) { /* If searching for a meta-data block, quit when found. */ if (metalbn == realbn) break; lbc -= lognindir; blockcnt = (int64_t) 1 << lbc; off = (bn >> lbc) & (fs->lfs_nindir - 1); ++numlevels; ap->in_lbn = metalbn; ap->in_off = off; ap->in_exists = 0; ++ap; metalbn -= -1 + (off << lbc); } if (nump) *nump = numlevels; return (0); } int lfs_vop_bmap(struct uvnode * vp, daddr_t lbn, daddr_t * daddrp) { return ufs_bmaparray(vp->v_fs, vp, lbn, daddrp, NULL, NULL); } /* Search a block for a specific dinode. */ struct ufs1_dinode * lfs_ifind(struct lfs * fs, ino_t ino, struct ubuf * bp) { struct ufs1_dinode *dip = (struct ufs1_dinode *) bp->b_data; struct ufs1_dinode *ldip, *fin; fin = dip + INOPB(fs); /* * Read the inode block backwards, since later versions of the * inode will supercede earlier ones. Though it is unlikely, it is * possible that the same inode will appear in the same inode block. */ for (ldip = fin - 1; ldip >= dip; --ldip) if (ldip->di_inumber == ino) return (ldip); return NULL; } /* * lfs_raw_vget makes us a new vnode from the inode at the given disk address. * XXX it currently loses atime information. */ struct uvnode * lfs_raw_vget(struct lfs * fs, ino_t ino, int fd, ufs_daddr_t daddr) { struct uvnode *vp; struct inode *ip; struct ufs1_dinode *dip; struct ubuf *bp; int i, hash; vp = ecalloc(1, sizeof(*vp)); vp->v_fd = fd; vp->v_fs = fs; vp->v_usecount = 0; vp->v_strategy_op = lfs_vop_strategy; vp->v_bwrite_op = lfs_vop_bwrite; vp->v_bmap_op = lfs_vop_bmap; LIST_INIT(&vp->v_cleanblkhd); LIST_INIT(&vp->v_dirtyblkhd); ip = ecalloc(1, sizeof(*ip)); ip->i_din.ffs1_din = ecalloc(1, sizeof(*ip->i_din.ffs1_din)); /* Initialize the inode -- from lfs_vcreate. */ ip->inode_ext.lfs = ecalloc(1, sizeof(*ip->inode_ext.lfs)); vp->v_data = ip; /* ip->i_vnode = vp; */ ip->i_number = ino; ip->i_lockf = 0; ip->i_lfs_effnblks = 0; ip->i_flag = 0; /* Load inode block and find inode */ if (daddr > 0) { bread(fs->lfs_devvp, fsbtodb(fs, daddr), fs->lfs_ibsize, NULL, 0, &bp); bp->b_flags |= B_AGE; dip = lfs_ifind(fs, ino, bp); if (dip == NULL) { brelse(bp, 0); free(ip); free(vp); return NULL; } memcpy(ip->i_din.ffs1_din, dip, sizeof(*dip)); brelse(bp, 0); } ip->i_number = ino; /* ip->i_devvp = fs->lfs_devvp; */ ip->i_lfs = fs; ip->i_lfs_effnblks = ip->i_ffs1_blocks; ip->i_lfs_osize = ip->i_ffs1_size; #if 0 if (fs->lfs_version > 1) { ip->i_ffs1_atime = ts.tv_sec; ip->i_ffs1_atimensec = ts.tv_nsec; } #endif memset(ip->i_lfs_fragsize, 0, NDADDR * sizeof(*ip->i_lfs_fragsize)); for (i = 0; i < NDADDR; i++) if (ip->i_ffs1_db[i] != 0) ip->i_lfs_fragsize[i] = blksize(fs, ip, i); ++nvnodes; hash = ((int)(intptr_t)fs + ino) & (VNODE_HASH_MAX - 1); LIST_INSERT_HEAD(&getvnodelist[hash], vp, v_getvnodes); LIST_INSERT_HEAD(&vnodelist, vp, v_mntvnodes); return vp; } static struct uvnode * lfs_vget(void *vfs, ino_t ino) { struct lfs *fs = (struct lfs *)vfs; ufs_daddr_t daddr; struct ubuf *bp; IFILE *ifp; LFS_IENTRY(ifp, fs, ino, bp); daddr = ifp->if_daddr; brelse(bp, 0); if (daddr <= 0 || dtosn(fs, daddr) >= fs->lfs_nseg) return NULL; return lfs_raw_vget(fs, ino, fs->lfs_ivnode->v_fd, daddr); } /* Check superblock magic number and checksum */ static int check_sb(struct lfs *fs) { u_int32_t checksum; if (fs->lfs_magic != LFS_MAGIC) { printf("Superblock magic number (0x%lx) does not match " "expected 0x%lx\n", (unsigned long) fs->lfs_magic, (unsigned long) LFS_MAGIC); return 1; } /* checksum */ checksum = lfs_sb_cksum(&(fs->lfs_dlfs)); if (fs->lfs_cksum != checksum) { printf("Superblock checksum (%lx) does not match computed checksum (%lx)\n", (unsigned long) fs->lfs_cksum, (unsigned long) checksum); return 1; } return 0; } /* Initialize LFS library; load superblocks and choose which to use. */ struct lfs * lfs_init(int devfd, daddr_t sblkno, daddr_t idaddr, int dummy_read, int debug) { struct uvnode *devvp; struct ubuf *bp; int tryalt; struct lfs *fs, *altfs; int error; vfs_init(); devvp = ecalloc(1, sizeof(*devvp)); devvp->v_fs = NULL; devvp->v_fd = devfd; devvp->v_strategy_op = raw_vop_strategy; devvp->v_bwrite_op = raw_vop_bwrite; devvp->v_bmap_op = raw_vop_bmap; LIST_INIT(&devvp->v_cleanblkhd); LIST_INIT(&devvp->v_dirtyblkhd); tryalt = 0; if (dummy_read) { if (sblkno == 0) sblkno = LFS_LABELPAD / dev_bsize; fs = ecalloc(1, sizeof(*fs)); fs->lfs_devvp = devvp; } else { if (sblkno == 0) { sblkno = LFS_LABELPAD / dev_bsize; tryalt = 1; } else if (debug) { printf("No -b flag given, not attempting to verify checkpoint\n"); } dev_bsize = DEV_BSIZE; error = bread(devvp, sblkno, LFS_SBPAD, NOCRED, 0, &bp); fs = ecalloc(1, sizeof(*fs)); fs->lfs_dlfs = *((struct dlfs *) bp->b_data); fs->lfs_devvp = devvp; bp->b_flags |= B_INVAL; brelse(bp, 0); dev_bsize = fs->lfs_fsize >> fs->lfs_fsbtodb; if (tryalt) { error = bread(devvp, fsbtodb(fs, fs->lfs_sboffs[1]), LFS_SBPAD, NOCRED, 0, &bp); altfs = ecalloc(1, sizeof(*altfs)); altfs->lfs_dlfs = *((struct dlfs *) bp->b_data); altfs->lfs_devvp = devvp; bp->b_flags |= B_INVAL; brelse(bp, 0); if (check_sb(fs) || fs->lfs_idaddr <= 0) { if (debug) printf("Primary superblock is no good, using first alternate\n"); free(fs); fs = altfs; } else { /* If both superblocks check out, try verification */ if (check_sb(altfs)) { if (debug) printf("First alternate superblock is no good, using primary\n"); free(altfs); } else { if (lfs_verify(fs, altfs, devvp, debug) == fs) { free(altfs); } else { free(fs); fs = altfs; } } } } if (check_sb(fs)) { free(fs); return NULL; } } /* Compatibility */ if (fs->lfs_version < 2) { fs->lfs_sumsize = LFS_V1_SUMMARY_SIZE; fs->lfs_ibsize = fs->lfs_bsize; fs->lfs_start = fs->lfs_sboffs[0]; fs->lfs_tstamp = fs->lfs_otstamp; fs->lfs_fsbtodb = 0; } if (!dummy_read) { fs->lfs_suflags = emalloc(2 * sizeof(u_int32_t *)); fs->lfs_suflags[0] = emalloc(fs->lfs_nseg * sizeof(u_int32_t)); fs->lfs_suflags[1] = emalloc(fs->lfs_nseg * sizeof(u_int32_t)); } if (idaddr == 0) idaddr = fs->lfs_idaddr; else fs->lfs_idaddr = idaddr; /* NB: If dummy_read!=0, idaddr==0 here so we get a fake inode. */ fs->lfs_ivnode = lfs_raw_vget(fs, (dummy_read ? LFS_IFILE_INUM : fs->lfs_ifile), devvp->v_fd, idaddr); if (fs->lfs_ivnode == NULL) return NULL; register_vget((void *)fs, lfs_vget); return fs; } /* * Check partial segment validity between fs->lfs_offset and the given goal. * * If goal == 0, just keep on going until the segments stop making sense, * and return the address of the last valid partial segment. * * If goal != 0, return the address of the first partial segment that failed, * or "goal" if we reached it without failure (the partial segment *at* goal * need not be valid). */ ufs_daddr_t try_verify(struct lfs *osb, struct uvnode *devvp, ufs_daddr_t goal, int debug) { ufs_daddr_t daddr, odaddr; SEGSUM *sp; int i, bc, hitclean; struct ubuf *bp; ufs_daddr_t nodirop_daddr; u_int64_t serial; bc = 0; hitclean = 0; odaddr = -1; daddr = osb->lfs_offset; nodirop_daddr = daddr; serial = osb->lfs_serial; while (daddr != goal) { /* * Don't mistakenly read a superblock, if there is one here. */ if (sntod(osb, dtosn(osb, daddr)) == daddr) { if (daddr == osb->lfs_start) daddr += btofsb(osb, LFS_LABELPAD); for (i = 0; i < LFS_MAXNUMSB; i++) { if (osb->lfs_sboffs[i] < daddr) break; if (osb->lfs_sboffs[i] == daddr) daddr += btofsb(osb, LFS_SBPAD); } } /* Read in summary block */ bread(devvp, fsbtodb(osb, daddr), osb->lfs_sumsize, NULL, 0, &bp); sp = (SEGSUM *)bp->b_data; /* * Check for a valid segment summary belonging to our fs. */ if (sp->ss_magic != SS_MAGIC || sp->ss_ident != osb->lfs_ident || sp->ss_serial < serial || /* XXX strengthen this */ sp->ss_sumsum != cksum(&sp->ss_datasum, osb->lfs_sumsize - sizeof(sp->ss_sumsum))) { brelse(bp, 0); if (debug) { if (sp->ss_magic != SS_MAGIC) pwarn("pseg at 0x%x: " "wrong magic number\n", (int)daddr); else if (sp->ss_ident != osb->lfs_ident) pwarn("pseg at 0x%x: " "expected ident %llx, got %llx\n", (int)daddr, (long long)sp->ss_ident, (long long)osb->lfs_ident); else if (sp->ss_serial >= serial) pwarn("pseg at 0x%x: " "serial %d < %d\n", (int)daddr, (int)sp->ss_serial, (int)serial); else pwarn("pseg at 0x%x: " "summary checksum wrong\n", (int)daddr); } break; } if (debug && sp->ss_serial != serial) pwarn("warning, serial=%d ss_serial=%d\n", (int)serial, (int)sp->ss_serial); ++serial; bc = check_summary(osb, sp, daddr, debug, devvp, NULL); if (bc == 0) { brelse(bp, 0); break; } if (debug) pwarn("summary good: 0x%x/%d\n", (int)daddr, (int)sp->ss_serial); assert (bc > 0); odaddr = daddr; daddr += btofsb(osb, osb->lfs_sumsize + bc); if (dtosn(osb, odaddr) != dtosn(osb, daddr) || dtosn(osb, daddr) != dtosn(osb, daddr + btofsb(osb, osb->lfs_sumsize + osb->lfs_bsize) - 1)) { daddr = sp->ss_next; } /* * Check for the beginning and ending of a sequence of * dirops. Writes from the cleaner never involve new * information, and are always checkpoints; so don't try * to roll forward through them. Likewise, psegs written * by a previous roll-forward attempt are not interesting. */ if (sp->ss_flags & (SS_CLEAN | SS_RFW)) hitclean = 1; if (hitclean == 0 && (sp->ss_flags & SS_CONT) == 0) nodirop_daddr = daddr; brelse(bp, 0); } if (goal == 0) return nodirop_daddr; else return daddr; } /* Use try_verify to check whether the newer superblock is valid. */ struct lfs * lfs_verify(struct lfs *sb0, struct lfs *sb1, struct uvnode *devvp, int debug) { ufs_daddr_t daddr; struct lfs *osb, *nsb; /* * Verify the checkpoint of the newer superblock, * if the timestamp/serial number of the two superblocks is * different. */ osb = NULL; if (debug) pwarn("sb0 %lld, sb1 %lld", (long long) sb0->lfs_serial, (long long) sb1->lfs_serial); if ((sb0->lfs_version == 1 && sb0->lfs_otstamp != sb1->lfs_otstamp) || (sb0->lfs_version > 1 && sb0->lfs_serial != sb1->lfs_serial)) { if (sb0->lfs_version == 1) { if (sb0->lfs_otstamp > sb1->lfs_otstamp) { osb = sb1; nsb = sb0; } else { osb = sb0; nsb = sb1; } } else { if (sb0->lfs_serial > sb1->lfs_serial) { osb = sb1; nsb = sb0; } else { osb = sb0; nsb = sb1; } } if (debug) { printf("Attempting to verify newer checkpoint..."); fflush(stdout); } daddr = try_verify(osb, devvp, nsb->lfs_offset, debug); if (debug) printf("done.\n"); if (daddr == nsb->lfs_offset) { pwarn("** Newer checkpoint verified, recovered %lld seconds of data\n", (long long) nsb->lfs_tstamp - (long long) osb->lfs_tstamp); sbdirty(); } else { pwarn("** Newer checkpoint invalid, lost %lld seconds of data\n", (long long) nsb->lfs_tstamp - (long long) osb->lfs_tstamp); } return (daddr == nsb->lfs_offset ? nsb : osb); } /* Nothing to check */ return osb; } /* Verify a partial-segment summary; return the number of bytes on disk. */ int check_summary(struct lfs *fs, SEGSUM *sp, ufs_daddr_t pseg_addr, int debug, struct uvnode *devvp, void (func(ufs_daddr_t, FINFO *))) { FINFO *fp; int bc; /* Bytes in partial segment */ int nblocks; ufs_daddr_t seg_addr, daddr; ufs_daddr_t *dp, *idp; struct ubuf *bp; int i, j, k, datac, len; long sn; u_int32_t *datap; u_int32_t ccksum; sn = dtosn(fs, pseg_addr); seg_addr = sntod(fs, sn); /* We've already checked the sumsum, just do the data bounds and sum */ /* Count the blocks. */ nblocks = howmany(sp->ss_ninos, INOPB(fs)); bc = nblocks << (fs->lfs_version > 1 ? fs->lfs_ffshift : fs->lfs_bshift); assert(bc >= 0); fp = (FINFO *) (sp + 1); for (i = 0; i < sp->ss_nfinfo; i++) { nblocks += fp->fi_nblocks; bc += fp->fi_lastlength + ((fp->fi_nblocks - 1) << fs->lfs_bshift); assert(bc >= 0); fp = (FINFO *) (fp->fi_blocks + fp->fi_nblocks); if (((char *)fp) - (char *)sp > fs->lfs_sumsize) return 0; } datap = emalloc(nblocks * sizeof(*datap)); datac = 0; dp = (ufs_daddr_t *) sp; dp += fs->lfs_sumsize / sizeof(ufs_daddr_t); dp--; idp = dp; daddr = pseg_addr + btofsb(fs, fs->lfs_sumsize); fp = (FINFO *) (sp + 1); for (i = 0, j = 0; i < sp->ss_nfinfo || j < howmany(sp->ss_ninos, INOPB(fs)); i++) { if (i >= sp->ss_nfinfo && *idp != daddr) { pwarn("Not enough inode blocks in pseg at 0x%" PRIx32 ": found %d, wanted %d\n", pseg_addr, j, howmany(sp->ss_ninos, INOPB(fs))); if (debug) pwarn("*idp=%x, daddr=%" PRIx32 "\n", *idp, daddr); break; } while (j < howmany(sp->ss_ninos, INOPB(fs)) && *idp == daddr) { bread(devvp, fsbtodb(fs, daddr), fs->lfs_ibsize, NOCRED, 0, &bp); datap[datac++] = ((u_int32_t *) (bp->b_data))[0]; brelse(bp, 0); ++j; daddr += btofsb(fs, fs->lfs_ibsize); --idp; } if (i < sp->ss_nfinfo) { if (func) func(daddr, fp); for (k = 0; k < fp->fi_nblocks; k++) { len = (k == fp->fi_nblocks - 1 ? fp->fi_lastlength : fs->lfs_bsize); bread(devvp, fsbtodb(fs, daddr), len, NOCRED, 0, &bp); datap[datac++] = ((u_int32_t *) (bp->b_data))[0]; brelse(bp, 0); daddr += btofsb(fs, len); } fp = (FINFO *) (fp->fi_blocks + fp->fi_nblocks); } } if (datac != nblocks) { pwarn("Partial segment at 0x%llx expected %d blocks counted %d\n", (long long) pseg_addr, nblocks, datac); } ccksum = cksum(datap, nblocks * sizeof(u_int32_t)); /* Check the data checksum */ if (ccksum != sp->ss_datasum) { pwarn("Partial segment at 0x%" PRIx32 " data checksum" " mismatch: given 0x%x, computed 0x%x\n", pseg_addr, sp->ss_datasum, ccksum); free(datap); return 0; } free(datap); assert(bc >= 0); return bc; } /* print message and exit */ void my_vpanic(int fatal, const char *fmt, va_list ap) { (void) vprintf(fmt, ap); exit(8); } void call_panic(const char *fmt, ...) { va_list ap; va_start(ap, fmt); panic_func(1, fmt, ap); va_end(ap); } /* Allocate a new inode. */ struct uvnode * lfs_valloc(struct lfs *fs, ino_t ino) { struct ubuf *bp, *cbp; struct ifile *ifp; ino_t new_ino; int error; int new_gen; CLEANERINFO *cip; /* Get the head of the freelist. */ LFS_GET_HEADFREE(fs, cip, cbp, &new_ino); /* * Remove the inode from the free list and write the new start * of the free list into the superblock. */ LFS_IENTRY(ifp, fs, new_ino, bp); if (ifp->if_daddr != LFS_UNUSED_DADDR) panic("lfs_valloc: inuse inode %d on the free list", new_ino); LFS_PUT_HEADFREE(fs, cip, cbp, ifp->if_nextfree); new_gen = ifp->if_version; /* version was updated by vfree */ brelse(bp, 0); /* Extend IFILE so that the next lfs_valloc will succeed. */ if (fs->lfs_freehd == LFS_UNUSED_INUM) { if ((error = extend_ifile(fs)) != 0) { LFS_PUT_HEADFREE(fs, cip, cbp, new_ino); return NULL; } } /* Set superblock modified bit and increment file count. */ sbdirty(); ++fs->lfs_nfiles; return lfs_raw_vget(fs, ino, fs->lfs_devvp->v_fd, 0x0); } #ifdef IN_FSCK_LFS void reset_maxino(ino_t); #endif /* * Add a new block to the Ifile, to accommodate future file creations. */ int extend_ifile(struct lfs *fs) { struct uvnode *vp; struct inode *ip; IFILE *ifp; IFILE_V1 *ifp_v1; struct ubuf *bp, *cbp; daddr_t i, blkno, max; ino_t oldlast; CLEANERINFO *cip; vp = fs->lfs_ivnode; ip = VTOI(vp); blkno = lblkno(fs, ip->i_ffs1_size); lfs_balloc(vp, ip->i_ffs1_size, fs->lfs_bsize, &bp); ip->i_ffs1_size += fs->lfs_bsize; ip->i_flag |= IN_MODIFIED; i = (blkno - fs->lfs_segtabsz - fs->lfs_cleansz) * fs->lfs_ifpb; LFS_GET_HEADFREE(fs, cip, cbp, &oldlast); LFS_PUT_HEADFREE(fs, cip, cbp, i); max = i + fs->lfs_ifpb; fs->lfs_bfree -= btofsb(fs, fs->lfs_bsize); if (fs->lfs_version == 1) { for (ifp_v1 = (IFILE_V1 *)bp->b_data; i < max; ++ifp_v1) { ifp_v1->if_version = 1; ifp_v1->if_daddr = LFS_UNUSED_DADDR; ifp_v1->if_nextfree = ++i; } ifp_v1--; ifp_v1->if_nextfree = oldlast; } else { for (ifp = (IFILE *)bp->b_data; i < max; ++ifp) { ifp->if_version = 1; ifp->if_daddr = LFS_UNUSED_DADDR; ifp->if_nextfree = ++i; } ifp--; ifp->if_nextfree = oldlast; } LFS_PUT_TAILFREE(fs, cip, cbp, max - 1); LFS_BWRITE_LOG(bp); #ifdef IN_FSCK_LFS reset_maxino(((ip->i_ffs1_size >> fs->lfs_bshift) - fs->lfs_segtabsz - fs->lfs_cleansz) * fs->lfs_ifpb); #endif return 0; } /* * Allocate a block, and to inode and filesystem block accounting for it * and for any indirect blocks the may need to be created in order for * this block to be created. * * Blocks which have never been accounted for (i.e., which "do not exist") * have disk address 0, which is translated by ufs_bmap to the special value * UNASSIGNED == -1, as in the historical UFS. * * Blocks which have been accounted for but which have not yet been written * to disk are given the new special disk address UNWRITTEN == -2, so that * they can be differentiated from completely new blocks. */ int lfs_balloc(struct uvnode *vp, off_t startoffset, int iosize, struct ubuf **bpp) { int offset; daddr_t daddr, idaddr; struct ubuf *ibp, *bp; struct inode *ip; struct lfs *fs; struct indir indirs[NIADDR+2], *idp; daddr_t lbn, lastblock; int bcount; int error, frags, i, nsize, osize, num; ip = VTOI(vp); fs = ip->i_lfs; offset = blkoff(fs, startoffset); lbn = lblkno(fs, startoffset); /* * Three cases: it's a block beyond the end of file, it's a block in * the file that may or may not have been assigned a disk address or * we're writing an entire block. * * Note, if the daddr is UNWRITTEN, the block already exists in * the cache (it was read or written earlier). If so, make sure * we don't count it as a new block or zero out its contents. If * it did not, make sure we allocate any necessary indirect * blocks. * * If we are writing a block beyond the end of the file, we need to * check if the old last block was a fragment. If it was, we need * to rewrite it. */ if (bpp) *bpp = NULL; /* Check for block beyond end of file and fragment extension needed. */ lastblock = lblkno(fs, ip->i_ffs1_size); if (lastblock < NDADDR && lastblock < lbn) { osize = blksize(fs, ip, lastblock); if (osize < fs->lfs_bsize && osize > 0) { if ((error = lfs_fragextend(vp, osize, fs->lfs_bsize, lastblock, (bpp ? &bp : NULL)))) return (error); ip->i_ffs1_size = (lastblock + 1) * fs->lfs_bsize; ip->i_flag |= IN_CHANGE | IN_UPDATE; if (bpp) (void) VOP_BWRITE(bp); } } /* * If the block we are writing is a direct block, it's the last * block in the file, and offset + iosize is less than a full * block, we can write one or more fragments. There are two cases: * the block is brand new and we should allocate it the correct * size or it already exists and contains some fragments and * may need to extend it. */ if (lbn < NDADDR && lblkno(fs, ip->i_ffs1_size) <= lbn) { osize = blksize(fs, ip, lbn); nsize = fragroundup(fs, offset + iosize); if (lblktosize(fs, lbn) >= ip->i_ffs1_size) { /* Brand new block or fragment */ frags = numfrags(fs, nsize); if (bpp) { *bpp = bp = getblk(vp, lbn, nsize); bp->b_blkno = UNWRITTEN; } ip->i_lfs_effnblks += frags; fs->lfs_bfree -= frags; ip->i_ffs1_db[lbn] = UNWRITTEN; } else { if (nsize <= osize) { /* No need to extend */ if (bpp && (error = bread(vp, lbn, osize, NOCRED, 0, &bp))) return error; } else { /* Extend existing block */ if ((error = lfs_fragextend(vp, osize, nsize, lbn, (bpp ? &bp : NULL)))) return error; } if (bpp) *bpp = bp; } return 0; } error = ufs_bmaparray(fs, vp, lbn, &daddr, &indirs[0], &num); if (error) return (error); daddr = (daddr_t)((int32_t)daddr); /* XXX ondisk32 */ /* * Do byte accounting all at once, so we can gracefully fail *before* * we start assigning blocks. */ frags = fsbtodb(fs, 1); /* frags = VFSTOUFS(vp->v_mount)->um_seqinc; */ bcount = 0; if (daddr == UNASSIGNED) { bcount = frags; } for (i = 1; i < num; ++i) { if (!indirs[i].in_exists) { bcount += frags; } } fs->lfs_bfree -= bcount; ip->i_lfs_effnblks += bcount; if (daddr == UNASSIGNED) { if (num > 0 && ip->i_ffs1_ib[indirs[0].in_off] == 0) { ip->i_ffs1_ib[indirs[0].in_off] = UNWRITTEN; } /* * Create new indirect blocks if necessary */ if (num > 1) { idaddr = ip->i_ffs1_ib[indirs[0].in_off]; for (i = 1; i < num; ++i) { ibp = getblk(vp, indirs[i].in_lbn, fs->lfs_bsize); if (!indirs[i].in_exists) { memset(ibp->b_data, 0, ibp->b_bufsize); ibp->b_blkno = UNWRITTEN; } else if (!(ibp->b_flags & (B_DELWRI | B_DONE))) { ibp->b_blkno = fsbtodb(fs, idaddr); ibp->b_flags |= B_READ; VOP_STRATEGY(ibp); } /* * This block exists, but the next one may not. * If that is the case mark it UNWRITTEN to * keep the accounting straight. */ /* XXX ondisk32 */ if (((int32_t *)ibp->b_data)[indirs[i].in_off] == 0) ((int32_t *)ibp->b_data)[indirs[i].in_off] = UNWRITTEN; /* XXX ondisk32 */ idaddr = ((int32_t *)ibp->b_data)[indirs[i].in_off]; if ((error = VOP_BWRITE(ibp))) return error; } } } /* * Get the existing block from the cache, if requested. */ if (bpp) *bpp = bp = getblk(vp, lbn, blksize(fs, ip, lbn)); /* * The block we are writing may be a brand new block * in which case we need to do accounting. * * We can tell a truly new block because ufs_bmaparray will say * it is UNASSIGNED. Once we allocate it we will assign it the * disk address UNWRITTEN. */ if (daddr == UNASSIGNED) { if (bpp) { /* Note the new address */ bp->b_blkno = UNWRITTEN; } switch (num) { case 0: ip->i_ffs1_db[lbn] = UNWRITTEN; break; case 1: ip->i_ffs1_ib[indirs[0].in_off] = UNWRITTEN; break; default: idp = &indirs[num - 1]; if (bread(vp, idp->in_lbn, fs->lfs_bsize, NOCRED, 0, &ibp)) panic("lfs_balloc: bread bno %lld", (long long)idp->in_lbn); /* XXX ondisk32 */ ((int32_t *)ibp->b_data)[idp->in_off] = UNWRITTEN; VOP_BWRITE(ibp); } } else if (bpp && !(bp->b_flags & (B_DONE|B_DELWRI))) { /* * Not a brand new block, also not in the cache; * read it in from disk. */ if (iosize == fs->lfs_bsize) /* Optimization: I/O is unnecessary. */ bp->b_blkno = daddr; else { /* * We need to read the block to preserve the * existing bytes. */ bp->b_blkno = daddr; bp->b_flags |= B_READ; VOP_STRATEGY(bp); return 0; } } return (0); } int lfs_fragextend(struct uvnode *vp, int osize, int nsize, daddr_t lbn, struct ubuf **bpp) { struct inode *ip; struct lfs *fs; int frags; int error; size_t obufsize; ip = VTOI(vp); fs = ip->i_lfs; frags = (long)numfrags(fs, nsize - osize); error = 0; /* * If we are not asked to actually return the block, all we need * to do is allocate space for it. UBC will handle dirtying the * appropriate things and making sure it all goes to disk. * Don't bother to read in that case. */ if (bpp && (error = bread(vp, lbn, osize, NOCRED, 0, bpp))) { brelse(*bpp, 0); goto out; } fs->lfs_bfree -= frags; ip->i_lfs_effnblks += frags; ip->i_flag |= IN_CHANGE | IN_UPDATE; if (bpp) { obufsize = (*bpp)->b_bufsize; (*bpp)->b_data = erealloc((*bpp)->b_data, nsize); (void)memset((*bpp)->b_data + osize, 0, nsize - osize); } out: return (error); }