/* $NetBSD: lfs.c,v 1.72.6.1 2017/10/30 09:29:04 snj 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 #define vnode uvnode #include #include #include #undef vnode #include #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 lfs *); 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)) { lfs_sb_subavail(fs, lfs_btofsb(fs, bp->b_bcount)); } bp->b_flags |= B_DELWRI | B_LOCKED; reassignbuf(bp, bp->b_vp); brelse(bp, 0); return 0; } /* * ulfs_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 ulfs_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[ULFS_NIADDR + 1], *xap; daddr_t daddr; daddr_t metalbn; int error, num; ip = VTOI(vp); if (bn >= 0 && bn < ULFS_NDADDR) { if (nump != NULL) *nump = 0; *bnp = LFS_FSBTODB(fs, lfs_dino_getdb(fs, ip->i_din, bn)); if (*bnp == 0) *bnp = -1; return (0); } xap = ap == NULL ? a : ap; if (!nump) nump = # if ((error = ulfs_getlbns(fs, vp, bn, xap, nump)) != 0) return (error); num = *nump; /* Get disk address out of indirect block array */ daddr = lfs_dino_getib(fs, ip->i_din, 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, lfs_sb_getbsize(fs)); if (!(bp->b_flags & (B_DONE | B_DELWRI))) { bp->b_blkno = LFS_FSBTODB(fs, daddr); bp->b_flags |= B_READ; VOP_STRATEGY(bp); } daddr = lfs_iblock_get(fs, bp->b_data, xap->in_off); } if (bp) brelse(bp, 0); daddr = LFS_FSBTODB(fs, 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 di_ib and * once with the offset into the page itself. */ int ulfs_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 = lfs_sb_getnindir(fs); 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 ULFS_NIADDR - i is the number of levels * of indirection needed to locate the requested block. */ bn -= ULFS_NDADDR; for (lbc = 0, i = ULFS_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 + ULFS_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 = ULFS_NIADDR - i; ap->in_exists = 0; ap++; for (++numlevels; i <= ULFS_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) & (lfs_sb_getnindir(fs) - 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 ulfs_bmaparray(vp->v_fs, vp, lbn, daddrp, NULL, NULL); } /* Search a block for a specific dinode. */ union lfs_dinode * lfs_ifind(struct lfs *fs, ino_t ino, struct ubuf *bp) { union lfs_dinode *ldip; unsigned i, num; num = LFS_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 (i = num; i-- > 0; ) { ldip = DINO_IN_BLOCK(fs, bp->b_data, i); if (lfs_dino_getinumber(fs, ldip) == 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, daddr_t daddr) { struct uvnode *vp; struct inode *ip; union lfs_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 = dip = ecalloc(1, sizeof(*dip)); /* 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_state = 0; /* Load inode block and find inode */ if (daddr > 0) { bread(fs->lfs_devvp, LFS_FSBTODB(fs, daddr), lfs_sb_getibsize(fs), 0, &bp); bp->b_flags |= B_AGE; dip = lfs_ifind(fs, ino, bp); if (dip == NULL) { brelse(bp, 0); free(ip->i_din); free(ip->inode_ext.lfs); free(ip); free(vp); return NULL; } lfs_copy_dinode(fs, ip->i_din, dip); brelse(bp, 0); } ip->i_number = ino; /* ip->i_devvp = fs->lfs_devvp; */ ip->i_lfs = fs; ip->i_lfs_effnblks = lfs_dino_getblocks(fs, ip->i_din); ip->i_lfs_osize = lfs_dino_getsize(fs, ip->i_din); #if 0 if (lfs_sb_getversion(fs) > 1) { lfs_dino_setatime(fs, ip->i_din, ts.tv_sec); lfs_dino_setatimensec(fs, ip->i_din, ts.tv_nsec); } #endif memset(ip->i_lfs_fragsize, 0, ULFS_NDADDR * sizeof(*ip->i_lfs_fragsize)); for (i = 0; i < ULFS_NDADDR; i++) if (lfs_dino_getdb(fs, ip->i_din, i) != 0) ip->i_lfs_fragsize[i] = lfs_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; daddr_t daddr; struct ubuf *bp; IFILE *ifp; LFS_IENTRY(ifp, fs, ino, bp); daddr = lfs_if_getdaddr(fs, ifp); brelse(bp, 0); if (daddr <= 0 || lfs_dtosn(fs, daddr) >= lfs_sb_getnseg(fs)) return NULL; return lfs_raw_vget(fs, ino, fs->lfs_ivnode->v_fd, daddr); } /* * Check superblock magic number and checksum. * Sets lfs_is64 and lfs_dobyteswap. */ static int check_sb(struct lfs *fs) { u_int32_t checksum; u_int32_t magic; /* we can read the magic out of either the 32-bit or 64-bit dlfs */ magic = fs->lfs_dlfs_u.u_32.dlfs_magic; switch (magic) { case LFS_MAGIC: fs->lfs_is64 = false; fs->lfs_dobyteswap = false; break; case LFS_MAGIC_SWAPPED: fs->lfs_is64 = false; fs->lfs_dobyteswap = true; break; case LFS64_MAGIC: fs->lfs_is64 = true; fs->lfs_dobyteswap = false; break; case LFS64_MAGIC_SWAPPED: fs->lfs_is64 = true; fs->lfs_dobyteswap = true; break; default: printf("Superblock magic number (0x%lx) does not match " "expected 0x%lx\n", (unsigned long) magic, (unsigned long) LFS_MAGIC); return 1; } /* checksum */ checksum = lfs_sb_cksum(fs); if (lfs_sb_getcksum(fs) != checksum) { printf("Superblock checksum (%lx) does not match computed checksum (%lx)\n", (unsigned long) lfs_sb_getcksum(fs), (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; 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; (void)bread(devvp, sblkno, LFS_SBPAD, 0, &bp); fs = ecalloc(1, sizeof(*fs)); __CTASSERT(sizeof(struct dlfs) == sizeof(struct dlfs64)); memcpy(&fs->lfs_dlfs_u, bp->b_data, sizeof(struct dlfs)); fs->lfs_devvp = devvp; bp->b_flags |= B_INVAL; brelse(bp, 0); dev_bsize = lfs_sb_getfsize(fs) >> lfs_sb_getfsbtodb(fs); if (tryalt) { (void)bread(devvp, LFS_FSBTODB(fs, lfs_sb_getsboff(fs, 1)), LFS_SBPAD, 0, &bp); altfs = ecalloc(1, sizeof(*altfs)); memcpy(&altfs->lfs_dlfs_u, bp->b_data, sizeof(struct dlfs)); altfs->lfs_devvp = devvp; bp->b_flags |= B_INVAL; brelse(bp, 0); if (check_sb(fs) || lfs_sb_getidaddr(fs) <= 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 (lfs_sb_getversion(fs) < 2) { lfs_sb_setsumsize(fs, LFS_V1_SUMMARY_SIZE); lfs_sb_setibsize(fs, lfs_sb_getbsize(fs)); lfs_sb_sets0addr(fs, lfs_sb_getsboff(fs, 0)); lfs_sb_settstamp(fs, lfs_sb_getotstamp(fs)); lfs_sb_setfsbtodb(fs, 0); } if (!dummy_read) { fs->lfs_suflags = emalloc(2 * sizeof(u_int32_t *)); fs->lfs_suflags[0] = emalloc(lfs_sb_getnseg(fs) * sizeof(u_int32_t)); fs->lfs_suflags[1] = emalloc(lfs_sb_getnseg(fs) * sizeof(u_int32_t)); } if (idaddr == 0) idaddr = lfs_sb_getidaddr(fs); else lfs_sb_setidaddr(fs, idaddr); /* NB: If dummy_read!=0, idaddr==0 here so we get a fake inode. */ fs->lfs_ivnode = lfs_raw_vget(fs, LFS_IFILE_INUM, 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). */ daddr_t try_verify(struct lfs *osb, struct uvnode *devvp, daddr_t goal, int debug) { daddr_t daddr, odaddr; SEGSUM *sp; int i, bc, hitclean; struct ubuf *bp; daddr_t nodirop_daddr; u_int64_t serial; bc = 0; hitclean = 0; odaddr = -1; daddr = lfs_sb_getoffset(osb); nodirop_daddr = daddr; serial = lfs_sb_getserial(osb); while (daddr != goal) { /* * Don't mistakenly read a superblock, if there is one here. */ if (lfs_sntod(osb, lfs_dtosn(osb, daddr)) == daddr) { if (daddr == lfs_sb_gets0addr(osb)) daddr += lfs_btofsb(osb, LFS_LABELPAD); for (i = 0; i < LFS_MAXNUMSB; i++) { /* XXX dholland 20150828 I think this is wrong */ if (lfs_sb_getsboff(osb, i) < daddr) break; if (lfs_sb_getsboff(osb, i) == daddr) daddr += lfs_btofsb(osb, LFS_SBPAD); } } /* Read in summary block */ bread(devvp, LFS_FSBTODB(osb, daddr), lfs_sb_getsumsize(osb), 0, &bp); sp = (SEGSUM *)bp->b_data; /* * Check for a valid segment summary belonging to our fs. */ if (lfs_ss_getmagic(osb, sp) != SS_MAGIC || lfs_ss_getident(osb, sp) != lfs_sb_getident(osb) || lfs_ss_getserial(osb, sp) < serial || /* XXX strengthen this */ lfs_ss_getsumsum(osb, sp) != cksum((char *)sp + lfs_ss_getsumstart(osb), lfs_sb_getsumsize(osb) - lfs_ss_getsumstart(osb))) { brelse(bp, 0); if (debug) { if (lfs_ss_getmagic(osb, sp) != SS_MAGIC) pwarn("pseg at 0x%jx: " "wrong magic number\n", (uintmax_t)daddr); else if (lfs_ss_getident(osb, sp) != lfs_sb_getident(osb)) pwarn("pseg at 0x%jx: " "expected ident %jx, got %jx\n", (uintmax_t)daddr, (uintmax_t)lfs_ss_getident(osb, sp), (uintmax_t)lfs_sb_getident(osb)); else if (lfs_ss_getserial(osb, sp) >= serial) pwarn("pseg at 0x%jx: " "serial %d < %d\n", (uintmax_t)daddr, (int)lfs_ss_getserial(osb, sp), (int)serial); else pwarn("pseg at 0x%jx: " "summary checksum wrong\n", (uintmax_t)daddr); } break; } if (debug && lfs_ss_getserial(osb, sp) != serial) pwarn("warning, serial=%d ss_serial=%d\n", (int)serial, (int)lfs_ss_getserial(osb, sp)); ++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", (uintmax_t)daddr, (int)lfs_ss_getserial(osb, sp)); assert (bc > 0); odaddr = daddr; daddr += lfs_btofsb(osb, lfs_sb_getsumsize(osb) + bc); if (lfs_dtosn(osb, odaddr) != lfs_dtosn(osb, daddr) || lfs_dtosn(osb, daddr) != lfs_dtosn(osb, daddr + lfs_btofsb(osb, lfs_sb_getsumsize(osb) + lfs_sb_getbsize(osb)) - 1)) { daddr = lfs_ss_getnext(osb, sp); } /* * 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 (lfs_ss_getflags(osb, sp) & (SS_CLEAN | SS_RFW)) hitclean = 1; if (hitclean == 0 && (lfs_ss_getflags(osb, sp) & 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) { 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 %ju, sb1 %ju", (uintmax_t) lfs_sb_getserial(sb0), (uintmax_t) lfs_sb_getserial(sb1)); if ((lfs_sb_getversion(sb0) == 1 && lfs_sb_getotstamp(sb0) != lfs_sb_getotstamp(sb1)) || (lfs_sb_getversion(sb0) > 1 && lfs_sb_getserial(sb0) != lfs_sb_getserial(sb1))) { if (lfs_sb_getversion(sb0) == 1) { if (lfs_sb_getotstamp(sb0) > lfs_sb_getotstamp(sb1)) { osb = sb1; nsb = sb0; } else { osb = sb0; nsb = sb1; } } else { if (lfs_sb_getserial(sb0) > lfs_sb_getserial(sb1)) { osb = sb1; nsb = sb0; } else { osb = sb0; nsb = sb1; } } if (debug) { printf("Attempting to verify newer checkpoint..."); fflush(stdout); } daddr = try_verify(osb, devvp, lfs_sb_getoffset(nsb), debug); if (debug) printf("done.\n"); if (daddr == lfs_sb_getoffset(nsb)) { pwarn("** Newer checkpoint verified; recovered %jd seconds of data\n", (intmax_t)(lfs_sb_gettstamp(nsb) - lfs_sb_gettstamp(osb))); sbdirty(); } else { pwarn("** Newer checkpoint invalid; lost %jd seconds of data\n", (intmax_t)(lfs_sb_gettstamp(nsb) - lfs_sb_gettstamp(osb))); } return (daddr == lfs_sb_getoffset(nsb) ? 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, daddr_t pseg_addr, int debug, struct uvnode *devvp, void (func(daddr_t, FINFO *))) { FINFO *fp; int bc; /* Bytes in partial segment */ int nblocks; daddr_t daddr; IINFO *iibase, *iip; struct ubuf *bp; int i, j, k, datac, len; lfs_checkword *datap; u_int32_t ccksum; /* We've already checked the sumsum, just do the data bounds and sum */ /* Count the blocks. */ nblocks = howmany(lfs_ss_getninos(fs, sp), LFS_INOPB(fs)); bc = nblocks << (lfs_sb_getversion(fs) > 1 ? lfs_sb_getffshift(fs) : lfs_sb_getbshift(fs)); assert(bc >= 0); fp = SEGSUM_FINFOBASE(fs, sp); for (i = 0; i < lfs_ss_getnfinfo(fs, sp); i++) { nblocks += lfs_fi_getnblocks(fs, fp); bc += lfs_fi_getlastlength(fs, fp) + ((lfs_fi_getnblocks(fs, fp) - 1) << lfs_sb_getbshift(fs)); assert(bc >= 0); fp = NEXT_FINFO(fs, fp); if (((char *)fp) - (char *)sp > lfs_sb_getsumsize(fs)) return 0; } datap = emalloc(nblocks * sizeof(*datap)); datac = 0; iibase = SEGSUM_IINFOSTART(fs, sp); iip = iibase; daddr = pseg_addr + lfs_btofsb(fs, lfs_sb_getsumsize(fs)); fp = SEGSUM_FINFOBASE(fs, sp); for (i = 0, j = 0; i < lfs_ss_getnfinfo(fs, sp) || j < howmany(lfs_ss_getninos(fs, sp), LFS_INOPB(fs)); i++) { if (i >= lfs_ss_getnfinfo(fs, sp) && lfs_ii_getblock(fs, iip) != daddr) { pwarn("Not enough inode blocks in pseg at 0x%jx: " "found %d, wanted %d\n", pseg_addr, j, howmany(lfs_ss_getninos(fs, sp), LFS_INOPB(fs))); if (debug) pwarn("iip=0x%jx, daddr=0x%jx\n", (uintmax_t)lfs_ii_getblock(fs, iip), (intmax_t)daddr); break; } while (j < howmany(lfs_ss_getninos(fs, sp), LFS_INOPB(fs)) && lfs_ii_getblock(fs, iip) == daddr) { bread(devvp, LFS_FSBTODB(fs, daddr), lfs_sb_getibsize(fs), 0, &bp); datap[datac++] = ((lfs_checkword *)bp->b_data)[0]; brelse(bp, 0); ++j; daddr += lfs_btofsb(fs, lfs_sb_getibsize(fs)); iip = NEXTLOWER_IINFO(fs, iip); } if (i < lfs_ss_getnfinfo(fs, sp)) { if (func) func(daddr, fp); for (k = 0; k < lfs_fi_getnblocks(fs, fp); k++) { len = (k == lfs_fi_getnblocks(fs, fp) - 1 ? lfs_fi_getlastlength(fs, fp) : lfs_sb_getbsize(fs)); bread(devvp, LFS_FSBTODB(fs, daddr), len, 0, &bp); datap[datac++] = ((lfs_checkword *)bp->b_data)[0]; brelse(bp, 0); daddr += lfs_btofsb(fs, len); } fp = NEXT_FINFO(fs, fp); } } if (datac != nblocks) { pwarn("Partial segment at 0x%jx expected %d blocks counted %d\n", (intmax_t)pseg_addr, nblocks, datac); } ccksum = cksum(datap, nblocks * sizeof(datap[0])); /* Check the data checksum */ if (ccksum != lfs_ss_getdatasum(fs, sp)) { pwarn("Partial segment at 0x%jx data checksum" " mismatch: given 0x%x, computed 0x%x\n", (uintmax_t)pseg_addr, lfs_ss_getdatasum(fs, sp), 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; IFILE *ifp; ino_t new_ino; int error; 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 (lfs_if_getdaddr(fs, ifp) != LFS_UNUSED_DADDR) panic("lfs_valloc: inuse inode %d on the free list", new_ino); LFS_PUT_HEADFREE(fs, cip, cbp, lfs_if_getnextfree(fs, ifp)); brelse(bp, 0); /* Extend IFILE so that the next lfs_valloc will succeed. */ if (lfs_sb_getfreehd(fs) == 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(); lfs_sb_addnfiles(fs, 1); 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; IFILE64 *ifp64; IFILE32 *ifp32; 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 = lfs_lblkno(fs, lfs_dino_getsize(fs, ip->i_din)); lfs_balloc(vp, lfs_dino_getsize(fs, ip->i_din), lfs_sb_getbsize(fs), &bp); lfs_dino_setsize(fs, ip->i_din, lfs_dino_getsize(fs, ip->i_din) + lfs_sb_getbsize(fs)); ip->i_state |= IN_MODIFIED; i = (blkno - lfs_sb_getsegtabsz(fs) - lfs_sb_getcleansz(fs)) * lfs_sb_getifpb(fs); LFS_GET_HEADFREE(fs, cip, cbp, &oldlast); LFS_PUT_HEADFREE(fs, cip, cbp, i); max = i + lfs_sb_getifpb(fs); lfs_sb_subbfree(fs, lfs_btofsb(fs, lfs_sb_getbsize(fs))); if (fs->lfs_is64) { for (ifp64 = (IFILE64 *)bp->b_data; i < max; ++ifp64) { ifp64->if_version = 1; ifp64->if_daddr = LFS_UNUSED_DADDR; ifp64->if_nextfree = ++i; } ifp64--; ifp64->if_nextfree = oldlast; } else if (lfs_sb_getversion(fs) > 1) { for (ifp32 = (IFILE32 *)bp->b_data; i < max; ++ifp32) { ifp32->if_version = 1; ifp32->if_daddr = LFS_UNUSED_DADDR; ifp32->if_nextfree = ++i; } ifp32--; ifp32->if_nextfree = oldlast; } else { 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; } LFS_PUT_TAILFREE(fs, cip, cbp, max - 1); LFS_BWRITE_LOG(bp); #ifdef IN_FSCK_LFS reset_maxino(((lfs_dino_getsize(fs, ip->i_din) >> lfs_sb_getbshift(fs)) - lfs_sb_getsegtabsz(fs) - lfs_sb_getcleansz(fs)) * lfs_sb_getifpb(fs)); #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 ulfs_bmap to the special value * UNASSIGNED == -1, as in the historical ULFS. * * 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[ULFS_NIADDR+2], *idp; daddr_t lbn, lastblock; int bcount; int error, frags, i, nsize, osize, num; ip = VTOI(vp); fs = ip->i_lfs; offset = lfs_blkoff(fs, startoffset); lbn = lfs_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 = lfs_lblkno(fs, lfs_dino_getsize(fs, ip->i_din)); if (lastblock < ULFS_NDADDR && lastblock < lbn) { osize = lfs_blksize(fs, ip, lastblock); if (osize < lfs_sb_getbsize(fs) && osize > 0) { if ((error = lfs_fragextend(vp, osize, lfs_sb_getbsize(fs), lastblock, (bpp ? &bp : NULL)))) return (error); lfs_dino_setsize(fs, ip->i_din, (lastblock + 1) * lfs_sb_getbsize(fs)); ip->i_state |= 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 < ULFS_NDADDR && lfs_lblkno(fs, lfs_dino_getsize(fs, ip->i_din)) <= lbn) { osize = lfs_blksize(fs, ip, lbn); nsize = lfs_fragroundup(fs, offset + iosize); if (lfs_lblktosize(fs, lbn) >= lfs_dino_getsize(fs, ip->i_din)) { /* Brand new block or fragment */ frags = lfs_numfrags(fs, nsize); if (bpp) { *bpp = bp = getblk(vp, lbn, nsize); bp->b_blkno = UNWRITTEN; } ip->i_lfs_effnblks += frags; lfs_sb_subbfree(fs, frags); lfs_dino_setdb(fs, ip->i_din, lbn, UNWRITTEN); } else { if (nsize <= osize) { /* No need to extend */ if (bpp && (error = bread(vp, lbn, osize, 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 = ulfs_bmaparray(fs, vp, lbn, &daddr, &indirs[0], &num); if (error) return (error); /* * Do byte accounting all at once, so we can gracefully fail *before* * we start assigning blocks. */ frags = LFS_FSBTODB(fs, 1); /* frags = VFSTOULFS(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; } } lfs_sb_subbfree(fs, bcount); ip->i_lfs_effnblks += bcount; if (daddr == UNASSIGNED) { if (num > 0 && lfs_dino_getib(fs, ip->i_din, indirs[0].in_off) == 0) { lfs_dino_setib(fs, ip->i_din, indirs[0].in_off, UNWRITTEN); } /* * Create new indirect blocks if necessary */ if (num > 1) { idaddr = lfs_dino_getib(fs, ip->i_din, indirs[0].in_off); for (i = 1; i < num; ++i) { ibp = getblk(vp, indirs[i].in_lbn, lfs_sb_getbsize(fs)); 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 = LFS_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. */ if (lfs_iblock_get(fs, ibp->b_data, indirs[i].in_off) == 0) lfs_iblock_set(fs, ibp->b_data, indirs[i].in_off, UNWRITTEN); idaddr = lfs_iblock_get(fs, 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, lfs_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 ulfs_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: lfs_dino_setdb(fs, ip->i_din, lbn, UNWRITTEN); break; case 1: lfs_dino_setib(fs, ip->i_din, indirs[0].in_off, UNWRITTEN); break; default: idp = &indirs[num - 1]; if (bread(vp, idp->in_lbn, lfs_sb_getbsize(fs), 0, &ibp)) panic("lfs_balloc: bread bno %lld", (long long)idp->in_lbn); lfs_iblock_set(fs, 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 == lfs_sb_getbsize(fs)) /* 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; ip = VTOI(vp); fs = ip->i_lfs; frags = (long)lfs_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, 0, bpp))) { brelse(*bpp, 0); goto out; } lfs_sb_subbfree(fs, frags); ip->i_lfs_effnblks += frags; ip->i_state |= IN_CHANGE | IN_UPDATE; if (bpp) { (*bpp)->b_data = erealloc((*bpp)->b_data, nsize); (void)memset((*bpp)->b_data + osize, 0, nsize - osize); } out: return (error); }