/* $OpenBSD: inode.c,v 1.26 2016/04/28 12:17:15 krw Exp $ */ /* $NetBSD: inode.c,v 1.8 2000/01/28 16:01:46 bouyer Exp $ */ /* * Copyright (c) 1997 Manuel Bouyer. * Copyright (c) 1980, 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. 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 /* btodb */ #include #include #include #include #include /* for IFMT & friends */ #ifndef SMALL #include #endif #include #include #include #include #include #include "fsck.h" #include "fsutil.h" #include "extern.h" /* * CG is stored in fs byte order in memory, so we can't use ino_to_fsba * here. */ #define fsck_ino_to_fsba(fs, x) \ (letoh32((fs)->e2fs_gd[ino_to_cg(fs, x)].ext2bgd_i_tables) + \ (((x)-1) % (fs)->e2fs.e2fs_ipg)/(fs)->e2fs_ipb) static ino_t startinum; static int iblock(struct inodesc *, long, u_int64_t); static int setlarge(void); static int setlarge(void) { if (sblock.e2fs.e2fs_rev < E2FS_REV1) { pfatal("LARGE FILES UNSUPPORTED ON REVISION 0 FILESYSTEMS"); return 0; } if (!(sblock.e2fs.e2fs_features_rocompat & EXT2F_ROCOMPAT_LARGEFILE)) { if (preen) pwarn("SETTING LARGE FILE INDICATOR\n"); else if (!reply("SET LARGE FILE INDICATOR")) return 0; sblock.e2fs.e2fs_features_rocompat |= EXT2F_ROCOMPAT_LARGEFILE; sbdirty(); } return 1; } u_int64_t inosize(struct ext2fs_dinode *dp) { u_int64_t size = letoh32(dp->e2di_size); if ((letoh16(dp->e2di_mode) & IFMT) == IFREG) size |= (u_int64_t)letoh32(dp->e2di_size_hi) << 32; if (size >= 0x80000000U) (void)setlarge(); return size; } void inossize(struct ext2fs_dinode *dp, u_int64_t size) { if ((letoh16(dp->e2di_mode) & IFMT) == IFREG) { dp->e2di_size_hi = htole32(size >> 32); if (size >= 0x80000000U) if (!setlarge()) return; } else if (size >= 0x80000000U) { pfatal("TRYING TO SET FILESIZE TO %llu ON MODE %x FILE\n", (unsigned long long)size, letoh16(dp->e2di_mode) & IFMT); return; } dp->e2di_size = htole32(size); } int ckinode(struct ext2fs_dinode *dp, struct inodesc *idesc) { u_int32_t *ap; long ret, n, ndb; struct ext2fs_dinode dino; u_int64_t remsize, sizepb; mode_t mode; char pathbuf[PATH_MAX + 1]; if (idesc->id_fix != IGNORE) idesc->id_fix = DONTKNOW; idesc->id_entryno = 0; idesc->id_filesize = inosize(dp); mode = letoh16(dp->e2di_mode) & IFMT; if (mode == IFBLK || mode == IFCHR || mode == IFIFO || (mode == IFLNK && (inosize(dp) < EXT2_MAXSYMLINKLEN))) return (KEEPON); dino = *dp; ndb = howmany(inosize(&dino), sblock.e2fs_bsize); for (ap = &dino.e2di_blocks[0]; ap < &dino.e2di_blocks[NDADDR]; ap++,ndb--) { idesc->id_numfrags = 1; if (*ap == 0) { if (idesc->id_type == DATA && ndb > 0) { /* An empty block in a directory XXX */ getpathname(pathbuf, sizeof pathbuf, idesc->id_number, idesc->id_number); pfatal("DIRECTORY %s: CONTAINS EMPTY BLOCKS", pathbuf); if (reply("ADJUST LENGTH") == 1) { dp = ginode(idesc->id_number); inossize(dp, (ap - &dino.e2di_blocks[0]) * sblock.e2fs_bsize); printf( "YOU MUST RERUN FSCK AFTERWARDS\n"); rerun = 1; inodirty(); } } continue; } idesc->id_blkno = letoh32(*ap); if (idesc->id_type == ADDR) ret = (*idesc->id_func)(idesc); else ret = dirscan(idesc); if (ret & STOP) return (ret); } idesc->id_numfrags = 1; remsize = inosize(&dino) - sblock.e2fs_bsize * NDADDR; sizepb = sblock.e2fs_bsize; for (ap = &dino.e2di_blocks[NDADDR], n = 1; n <= NIADDR; ap++, n++) { if (*ap) { idesc->id_blkno = letoh32(*ap); ret = iblock(idesc, n, remsize); if (ret & STOP) return (ret); } else { if (idesc->id_type == DATA && remsize > 0) { /* An empty block in a directory XXX */ getpathname(pathbuf, sizeof pathbuf, idesc->id_number, idesc->id_number); pfatal("DIRECTORY %s: CONTAINS EMPTY BLOCKS", pathbuf); if (reply("ADJUST LENGTH") == 1) { dp = ginode(idesc->id_number); inossize(dp, inosize(dp) - remsize); remsize = 0; printf( "YOU MUST RERUN FSCK AFTERWARDS\n"); rerun = 1; inodirty(); break; } } } sizepb *= NINDIR(&sblock); remsize -= sizepb; } return (KEEPON); } static int iblock(struct inodesc *idesc, long ilevel, u_int64_t isize) { daddr32_t *ap; daddr32_t *aplim; struct bufarea *bp; int i, n, (*func)(struct inodesc *), nif; u_int64_t sizepb; char buf[BUFSIZ]; char pathbuf[PATH_MAX + 1]; struct ext2fs_dinode *dp; if (idesc->id_type == ADDR) { func = idesc->id_func; if (((n = (*func)(idesc)) & KEEPON) == 0) return (n); } else func = dirscan; if (chkrange(idesc->id_blkno, idesc->id_numfrags)) return (SKIP); bp = getdatablk(idesc->id_blkno, sblock.e2fs_bsize); ilevel--; for (sizepb = sblock.e2fs_bsize, i = 0; i < ilevel; i++) sizepb *= NINDIR(&sblock); if (isize > sizepb * NINDIR(&sblock)) nif = NINDIR(&sblock); else nif = howmany(isize, sizepb); if (idesc->id_func == pass1check && nif < NINDIR(&sblock)) { aplim = &bp->b_un.b_indir[NINDIR(&sblock)]; for (ap = &bp->b_un.b_indir[nif]; ap < aplim; ap++) { if (*ap == 0) continue; (void)snprintf(buf, sizeof(buf), "PARTIALLY TRUNCATED INODE I=%llu", (unsigned long long)idesc->id_number); if (dofix(idesc, buf)) { *ap = 0; dirty(bp); } } flush(fswritefd, bp); } aplim = &bp->b_un.b_indir[nif]; for (ap = bp->b_un.b_indir; ap < aplim; ap++) { if (*ap) { idesc->id_blkno = letoh32(*ap); if (ilevel == 0) n = (*func)(idesc); else n = iblock(idesc, ilevel, isize); if (n & STOP) { bp->b_flags &= ~B_INUSE; return (n); } } else { if (idesc->id_type == DATA && isize > 0) { /* An empty block in a directory XXX */ getpathname(pathbuf, sizeof pathbuf, idesc->id_number, idesc->id_number); pfatal("DIRECTORY %s: CONTAINS EMPTY BLOCKS", pathbuf); if (reply("ADJUST LENGTH") == 1) { dp = ginode(idesc->id_number); inossize(dp, inosize(dp) - isize); isize = 0; printf( "YOU MUST RERUN FSCK AFTERWARDS\n"); rerun = 1; inodirty(); bp->b_flags &= ~B_INUSE; return(STOP); } } } isize -= sizepb; } bp->b_flags &= ~B_INUSE; return (KEEPON); } /* * Check that a block in a legal block number. * Return 0 if in range, 1 if out of range. */ int chkrange(daddr32_t blk, int cnt) { int c, overh; if ((unsigned)(blk + cnt) > maxfsblock) return (1); c = dtog(&sblock, blk); overh = cgoverhead(c); if (blk < sblock.e2fs.e2fs_bpg * c + overh + sblock.e2fs.e2fs_first_dblock) { if ((blk + cnt) > sblock.e2fs.e2fs_bpg * c + overh + sblock.e2fs.e2fs_first_dblock) { if (debug) { printf("blk %d < cgdmin %d;", blk, sblock.e2fs.e2fs_bpg * c + overh + sblock.e2fs.e2fs_first_dblock); printf(" blk + cnt %d > cgsbase %d\n", blk + cnt, sblock.e2fs.e2fs_bpg * c + overh + sblock.e2fs.e2fs_first_dblock); } return (1); } } else { if ((blk + cnt) > sblock.e2fs.e2fs_bpg * (c + 1) + overh + sblock.e2fs.e2fs_first_dblock) { if (debug) { printf("blk %d >= cgdmin %d;", blk, sblock.e2fs.e2fs_bpg * c + overh + sblock.e2fs.e2fs_first_dblock); printf(" blk + cnt %d > cgdmax %d\n", blk+cnt, sblock.e2fs.e2fs_bpg * (c + 1) + overh + sblock.e2fs.e2fs_first_dblock); } return (1); } } return (0); } /* * General purpose interface for reading inodes. */ struct ext2fs_dinode * ginode(ino_t inumber) { daddr32_t iblk; if ((inumber < EXT2_FIRSTINO && inumber != EXT2_ROOTINO) || inumber > maxino) errexit("bad inode number %llu to ginode\n", (unsigned long long)inumber); if (startinum == 0 || inumber < startinum || inumber >= startinum + sblock.e2fs_ipb) { iblk = fsck_ino_to_fsba(&sblock, inumber); if (pbp != 0) pbp->b_flags &= ~B_INUSE; pbp = getdatablk(iblk, sblock.e2fs_bsize); startinum = ((inumber -1) / sblock.e2fs_ipb) * sblock.e2fs_ipb + 1; } return (&pbp->b_un.b_dinode[(inumber-1) % sblock.e2fs_ipb]); } /* * Special purpose version of ginode used to optimize first pass * over all the inodes in numerical order. */ ino_t nextino, lastinum; long readcnt, readpercg, fullcnt, inobufsize, partialcnt, partialsize; struct ext2fs_dinode *inodebuf; struct ext2fs_dinode * getnextinode(ino_t inumber) { long size; daddr32_t dblk; struct ext2fs_dinode *dp; static char *bp; if (inumber != nextino++ || inumber > maxino) errexit("bad inode number %llu to nextinode\n", (unsigned long long)inumber); if (inumber >= lastinum) { readcnt++; dblk = fsbtodb(&sblock, fsck_ino_to_fsba(&sblock, lastinum)); if (readcnt % readpercg == 0) { size = partialsize; lastinum += partialcnt; } else { size = inobufsize; lastinum += fullcnt; } (void)bread(fsreadfd, (char *)inodebuf, dblk, size); bp = (char *)inodebuf; } dp = (struct ext2fs_dinode *)bp; bp += EXT2_DINODE_SIZE(&sblock); return (dp); } void resetinodebuf(void) { startinum = 0; nextino = 1; lastinum = 1; readcnt = 0; inobufsize = blkroundup(&sblock, INOBUFSIZE); fullcnt = inobufsize / EXT2_DINODE_SIZE(&sblock); readpercg = sblock.e2fs.e2fs_ipg / fullcnt; partialcnt = sblock.e2fs.e2fs_ipg % fullcnt; partialsize = partialcnt * EXT2_DINODE_SIZE(&sblock); if (partialcnt != 0) { readpercg++; } else { partialcnt = fullcnt; partialsize = inobufsize; } if (inodebuf == NULL && (inodebuf = malloc((unsigned)inobufsize)) == NULL) errexit("Cannot allocate space for inode buffer\n"); while (nextino < EXT2_ROOTINO) (void)getnextinode(nextino); } void freeinodebuf(void) { if (inodebuf != NULL) free((char *)inodebuf); inodebuf = NULL; } /* * Routines to maintain information about directory inodes. * This is built during the first pass and used during the * second and third passes. * * Enter inodes into the cache. */ void cacheino(struct ext2fs_dinode *dp, ino_t inumber) { struct inoinfo *inp; struct inoinfo **inpp; unsigned int blks; blks = howmany(inosize(dp), sblock.e2fs_bsize); if (blks > NDADDR) blks = NDADDR + NIADDR; inp = malloc(sizeof(*inp) + (blks - 1) * sizeof(daddr32_t)); if (inp == NULL) return; inpp = &inphead[inumber % numdirs]; inp->i_nexthash = *inpp; *inpp = inp; inp->i_child = inp->i_sibling = inp->i_parentp = 0; if (inumber == EXT2_ROOTINO) inp->i_parent = EXT2_ROOTINO; else inp->i_parent = (ino_t)0; inp->i_dotdot = (ino_t)0; inp->i_number = inumber; inp->i_isize = inosize(dp); inp->i_numblks = blks * sizeof(daddr32_t); memcpy(&inp->i_blks[0], &dp->e2di_blocks[0], (size_t)inp->i_numblks); if (inplast == listmax) { listmax += 100; inpsort = reallocarray(inpsort, listmax, sizeof(struct inoinfo *)); if (inpsort == NULL) errexit("cannot increase directory list\n"); } inpsort[inplast++] = inp; } /* * Look up an inode cache structure. */ struct inoinfo * getinoinfo(ino_t inumber) { struct inoinfo *inp; for (inp = inphead[inumber % numdirs]; inp; inp = inp->i_nexthash) { if (inp->i_number != inumber) continue; return (inp); } errexit("cannot find inode %llu\n", (unsigned long long)inumber); return (NULL); } /* * Clean up all the inode cache structure. */ void inocleanup(void) { struct inoinfo **inpp; if (inphead == NULL) return; for (inpp = &inpsort[inplast - 1]; inpp >= inpsort; inpp--) free((char *)(*inpp)); free((char *)inphead); free((char *)inpsort); inphead = inpsort = NULL; } void inodirty(void) { dirty(pbp); } void clri(struct inodesc *idesc, char *type, int flag) { struct ext2fs_dinode *dp; dp = ginode(idesc->id_number); if (flag == 1) { pwarn("%s %s", type, (dp->e2di_mode & IFMT) == IFDIR ? "DIR" : "FILE"); pinode(idesc->id_number); } if (preen || reply("CLEAR") == 1) { if (preen) printf(" (CLEARED)\n"); n_files--; (void)ckinode(dp, idesc); clearinode(dp); statemap[idesc->id_number] = USTATE; inodirty(); } } int findname(struct inodesc *idesc) { struct ext2fs_direct *dirp = idesc->id_dirp; u_int16_t namlen = dirp->e2d_namlen; if (letoh32(dirp->e2d_ino) != idesc->id_parent) return (KEEPON); memcpy(idesc->id_name, dirp->e2d_name, (size_t)namlen); idesc->id_name[namlen] = '\0'; return (STOP|FOUND); } int findino(struct inodesc *idesc) { struct ext2fs_direct *dirp = idesc->id_dirp; u_int32_t ino = letoh32(dirp->e2d_ino); if (ino == 0) return (KEEPON); if (strcmp(dirp->e2d_name, idesc->id_name) == 0 && (ino == EXT2_ROOTINO || ino >= EXT2_FIRSTINO) && ino <= maxino) { idesc->id_parent = ino; return (STOP|FOUND); } return (KEEPON); } void pinode(ino_t ino) { struct ext2fs_dinode *dp; char *p; struct passwd *pw; time_t t; u_int32_t uid; printf(" I=%llu ", (unsigned long long)ino); if ((ino < EXT2_FIRSTINO && ino != EXT2_ROOTINO) || ino > maxino) return; dp = ginode(ino); printf(" OWNER="); uid = letoh16(dp->e2di_uid_low) | (letoh16(dp->e2di_uid_high) << 16); #ifndef SMALL if ((pw = getpwuid((int)uid)) != 0) printf("%s ", pw->pw_name); else #endif printf("%u ", (unsigned)uid); printf("MODE=%o\n", letoh16(dp->e2di_mode)); if (preen) printf("%s: ", cdevname()); printf("SIZE=%llu ", (long long)inosize(dp)); t = (time_t) letoh32(dp->e2di_mtime); p = ctime(&t); printf("MTIME=%12.12s %4.4s ", &p[4], &p[20]); } void blkerror(ino_t ino, char *type, daddr32_t blk) { pfatal("%d %s I=%llu", blk, type, (unsigned long long)ino); printf("\n"); switch (statemap[ino]) { case FSTATE: statemap[ino] = FCLEAR; return; case DSTATE: statemap[ino] = DCLEAR; return; case FCLEAR: case DCLEAR: return; default: errexit("BAD STATE %d TO BLKERR\n", statemap[ino]); /* NOTREACHED */ } } /* * allocate an unused inode */ ino_t allocino(ino_t request, int type) { ino_t ino; struct ext2fs_dinode *dp; time_t t; if (request == 0) request = EXT2_ROOTINO; else if (statemap[request] != USTATE) return (0); for (ino = request; ino < maxino; ino++) { if ((ino > EXT2_ROOTINO) && (ino < EXT2_FIRSTINO)) continue; if (statemap[ino] == USTATE) break; } if (ino == maxino) return (0); switch (type & IFMT) { case IFDIR: statemap[ino] = DSTATE; break; case IFREG: case IFLNK: statemap[ino] = FSTATE; break; default: return (0); } dp = ginode(ino); dp->e2di_blocks[0] = htole32(allocblk()); if (dp->e2di_blocks[0] == 0) { statemap[ino] = USTATE; return (0); } dp->e2di_mode = htole16(type); (void)time(&t); dp->e2di_atime = (u_int32_t)htole32(t); dp->e2di_mtime = dp->e2di_ctime = dp->e2di_atime; dp->e2di_dtime = 0; inossize(dp, sblock.e2fs_bsize); dp->e2di_nblock = htole32(btodb(sblock.e2fs_bsize)); n_files++; inodirty(); typemap[ino] = E2IFTODT(type); return (ino); } /* * deallocate an inode */ void freeino(ino_t ino) { struct inodesc idesc; struct ext2fs_dinode *dp; memset(&idesc, 0, sizeof(struct inodesc)); idesc.id_type = ADDR; idesc.id_func = pass4check; idesc.id_number = ino; dp = ginode(ino); (void)ckinode(dp, &idesc); clearinode(dp); inodirty(); statemap[ino] = USTATE; n_files--; }