/* $NetBSD: traverse.c,v 1.50 2013/06/15 01:27:19 christos Exp $ */ /*- * Copyright (c) 1980, 1988, 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. 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[] = "@(#)traverse.c 8.7 (Berkeley) 6/15/95"; #else __RCSID("$NetBSD: traverse.c,v 1.50 2013/06/15 01:27:19 christos Exp $"); #endif #endif /* not lint */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include "dump.h" #define HASDUMPEDFILE 0x1 #define HASSUBDIRS 0x2 static int dirindir(ino_t, daddr_t, int, off_t *, u_int64_t *, int); static void dmpindir(ino_t, daddr_t, int, off_t *); static int searchdir(ino_t, daddr_t, long, off_t, u_int64_t *, int); /* * This is an estimation of the number of TP_BSIZE blocks in the file. * It estimates the number of blocks in files with holes by assuming * that all of the blocks accounted for by di_blocks are data blocks * (when some of the blocks are usually used for indirect pointers); * hence the estimate may be high. */ int64_t blockest(union dinode *dp) { int64_t blkest, sizeest; /* * dp->di_size is the size of the file in bytes. * dp->di_blocks stores the number of sectors actually in the file. * If there are more sectors than the size would indicate, this just * means that there are indirect blocks in the file or unused * sectors in the last file block; we can safely ignore these * (blkest = sizeest below). * If the file is bigger than the number of sectors would indicate, * then the file has holes in it. In this case we must use the * block count to estimate the number of data blocks used, but * we use the actual size for estimating the number of indirect * dump blocks (sizeest vs. blkest in the indirect block * calculation). */ if (DIP(dp, flags) & SF_SNAPSHOT) return (1); blkest = howmany(ufs_fragroundup(ufsib, dbtob((u_int64_t)DIP(dp, blocks))), TP_BSIZE); sizeest = howmany(ufs_fragroundup(ufsib, DIP(dp, size)), TP_BSIZE); if (blkest > sizeest) blkest = sizeest; if (DIP(dp, size) > ufsib->ufs_bsize * UFS_NDADDR) { /* calculate the number of indirect blocks on the dump tape */ blkest += howmany(sizeest - UFS_NDADDR * ufsib->ufs_bsize / TP_BSIZE, TP_NINDIR); } return (blkest + 1); } /* Auxiliary macro to pick up files changed since previous dump. */ #define CHANGEDSINCE(dp, t) \ (DIP((dp), mtime) >= (t) || DIP((dp), ctime) >= (t)) /* The WANTTODUMP macro decides whether a file should be dumped. */ #ifdef UF_NODUMP #define WANTTODUMP(dp) \ (CHANGEDSINCE(dp, iswap64(spcl.c_ddate)) && \ (nonodump || (DIP((dp), flags) & UF_NODUMP) != UF_NODUMP)) #else #define WANTTODUMP(dp) CHANGEDSINCE(dp, iswap64(spcl.c_ddate)) #endif /* * Determine if given inode should be dumped */ void mapfileino(ino_t ino, u_int64_t *tape_size, int *dirskipped) { int mode; union dinode *dp; /* * Skip inode if we've already marked it for dumping */ if (TSTINO(ino, usedinomap)) return; dp = getino(ino); if (dp == NULL || (mode = (DIP(dp, mode) & IFMT)) == 0) return; /* * Skip WAPBL log file inodes. */ if (DIP(dp, flags) & SF_LOG) return; /* * Put all dirs in dumpdirmap, inodes that are to be dumped in the * used map. All inode but dirs who have the nodump attribute go * to the usedinomap. */ SETINO(ino, usedinomap); if (mode == IFDIR) SETINO(ino, dumpdirmap); if (WANTTODUMP(dp)) { SETINO(ino, dumpinomap); if (mode != IFREG && mode != IFDIR && mode != IFLNK) *tape_size += 1; else *tape_size += blockest(dp); return; } if (mode == IFDIR) { #ifdef UF_NODUMP if (!nonodump && (DIP(dp, flags) & UF_NODUMP)) CLRINO(ino, usedinomap); #endif *dirskipped = 1; } } /* * Dump pass 1. * * Walk the inode list for a file system to find all allocated inodes * that have been modified since the previous dump time. Also, find all * the directories in the file system. * disk may be NULL if dirv is NULL. */ int mapfiles(ino_t maxino, u_int64_t *tape_size, char *diskname, char * const *dirv) { int anydirskipped = 0; if (dirv != NULL) { char curdir[MAXPATHLEN]; FTS *dirh; FTSENT *entry; int d; if (getcwd(curdir, sizeof(curdir)) == NULL) { msg("Can't determine cwd: %s\n", strerror(errno)); dumpabort(0); } if ((dirh = fts_open(dirv, FTS_PHYSICAL|FTS_SEEDOT|FTS_XDEV, NULL)) == NULL) { msg("fts_open failed: %s\n", strerror(errno)); dumpabort(0); } while ((entry = fts_read(dirh)) != NULL) { switch (entry->fts_info) { case FTS_DNR: /* an error */ case FTS_ERR: case FTS_NS: msg("Can't fts_read %s: %s\n", entry->fts_path, strerror(errno)); case FTS_DP: /* already seen dir */ continue; } mapfileino(entry->fts_statp->st_ino, tape_size, &anydirskipped); } (void)fts_close(dirh); /* * Add any parent directories */ for (d = 0 ; dirv[d] != NULL ; d++) { char path[MAXPATHLEN]; if (dirv[d][0] != '/') (void)snprintf(path, sizeof(path), "%s/%s", curdir, dirv[d]); else (void)snprintf(path, sizeof(path), "%s", dirv[d]); while (strcmp(path, diskname) != 0) { char *p; struct stat sb; if (*path == '\0') break; if ((p = strrchr(path, '/')) == NULL) break; if (p == path) break; *p = '\0'; if (stat(path, &sb) == -1) { msg("Can't stat %s: %s\n", path, strerror(errno)); break; } mapfileino(sb.st_ino, tape_size, &anydirskipped); } } /* * Ensure that the root inode actually appears in the * file list for a subdir */ mapfileino(UFS_ROOTINO, tape_size, &anydirskipped); } else { fs_mapinodes(maxino, tape_size, &anydirskipped); } /* * Restore gets very upset if the root is not dumped, * so ensure that it always is dumped. */ SETINO(UFS_ROOTINO, dumpinomap); return (anydirskipped); } /* * Dump pass 2. * * Scan each directory on the file system to see if it has any modified * files in it. If it does, and has not already been added to the dump * list (because it was itself modified), then add it. If a directory * has not been modified itself, contains no modified files and has no * subdirectories, then it can be deleted from the dump list and from * the list of directories. By deleting it from the list of directories, * its parent may now qualify for the same treatment on this or a later * pass using this algorithm. */ int mapdirs(ino_t maxino, u_int64_t *tape_size) { union dinode *dp, di; int i, isdir, nodump; char *map; ino_t ino; off_t filesize; int ret, change = 0; daddr_t blk; isdir = 0; /* XXX just to get gcc to shut up */ for (map = dumpdirmap, ino = 1; ino < maxino; ino++) { if (((ino - 1) % NBBY) == 0) /* map is offset by 1 */ isdir = *map++; else isdir >>= 1; /* * If dir has been removed from the used map, it's either * because it had the nodump flag, or it inherited it from * its parent. A directory can't be in dumpinomap if * not in usedinomap, but we have to go throuh it anyway * to propagate the nodump attribute. */ nodump = (TSTINO(ino, usedinomap) == 0); if ((isdir & 1) == 0 || (TSTINO(ino, dumpinomap) && nodump == 0)) continue; dp = getino(ino); /* * inode buf may be changed in searchdir(). */ if (is_ufs2) di.dp2 = dp->dp2; else di.dp1 = dp->dp1; filesize = DIP(&di, size); for (ret = 0, i = 0; filesize > 0 && i < UFS_NDADDR; i++) { if (is_ufs2) blk = iswap64(di.dp2.di_db[i]); else blk = iswap32(di.dp1.di_db[i]); if (blk != 0) ret |= searchdir(ino, blk, (long)ufs_dblksize(ufsib, &di, i), filesize, tape_size, nodump); if (ret & HASDUMPEDFILE) filesize = 0; else filesize -= ufsib->ufs_bsize; } for (i = 0; filesize > 0 && i < UFS_NIADDR; i++) { if (is_ufs2) blk = iswap64(di.dp2.di_ib[i]); else blk = iswap32(di.dp1.di_ib[i]); if (blk == 0) continue; ret |= dirindir(ino, blk, i, &filesize, tape_size, nodump); } if (ret & HASDUMPEDFILE) { SETINO(ino, dumpinomap); *tape_size += blockest(&di); change = 1; continue; } if (nodump) { if (ret & HASSUBDIRS) change = 1; /* subdirs have inherited nodump */ CLRINO(ino, dumpdirmap); } else if ((ret & HASSUBDIRS) == 0) { if (!TSTINO(ino, dumpinomap)) { CLRINO(ino, dumpdirmap); change = 1; } } } return (change); } /* * Read indirect blocks, and pass the data blocks to be searched * as directories. Quit as soon as any entry is found that will * require the directory to be dumped. */ static int dirindir(ino_t ino, daddr_t blkno, int ind_level, off_t *filesize, u_int64_t *tape_size, int nodump) { int ret = 0; int i; union { int64_t i64[MAXBSIZE / sizeof (int64_t)]; int32_t i32[MAXBSIZE / sizeof (int32_t)]; } idblk; bread(fsatoda(ufsib, blkno), (char *)&idblk, (int)ufsib->ufs_bsize); if (ind_level <= 0) { for (i = 0; *filesize > 0 && i < ufsib->ufs_nindir; i++) { if (is_ufs2) blkno = iswap64(idblk.i64[i]); else blkno = iswap32(idblk.i32[i]); if (blkno != 0) ret |= searchdir(ino, blkno, ufsib->ufs_bsize, *filesize, tape_size, nodump); if (ret & HASDUMPEDFILE) *filesize = 0; else *filesize -= ufsib->ufs_bsize; } return (ret); } ind_level--; for (i = 0; *filesize > 0 && i < ufsib->ufs_nindir; i++) { if (is_ufs2) blkno = iswap64(idblk.i64[i]); else blkno = iswap32(idblk.i32[i]); if (blkno != 0) ret |= dirindir(ino, blkno, ind_level, filesize, tape_size, nodump); } return (ret); } /* * Scan a disk block containing directory information looking to see if * any of the entries are on the dump list and to see if the directory * contains any subdirectories. */ static int searchdir(ino_t dino, daddr_t blkno, long size, off_t filesize, u_int64_t *tape_size, int nodump) { struct direct *dp; union dinode *ip; long loc, ret = 0; char *dblk; ino_t ino; dblk = malloc(size); if (dblk == NULL) quit("searchdir: cannot allocate directory memory.\n"); bread(fsatoda(ufsib, blkno), dblk, (int)size); if (filesize < size) size = filesize; for (loc = 0; loc < size; ) { dp = (struct direct *)(dblk + loc); if (dp->d_reclen == 0) { msg("corrupted directory, inumber %llu\n", (unsigned long long)dino); break; } loc += iswap16(dp->d_reclen); if (dp->d_ino == 0) continue; if (dp->d_name[0] == '.') { if (dp->d_name[1] == '\0') continue; if (dp->d_name[1] == '.' && dp->d_name[2] == '\0') continue; } ino = iswap32(dp->d_ino); if (nodump) { ip = getino(ino); if (TSTINO(ino, dumpinomap)) { CLRINO(ino, dumpinomap); *tape_size -= blockest(ip); } /* * Add back to dumpdirmap and remove from usedinomap * to propagate nodump. */ if ((DIP(ip, mode) & IFMT) == IFDIR) { SETINO(ino, dumpdirmap); CLRINO(ino, usedinomap); ret |= HASSUBDIRS; } } else { if (TSTINO(ino, dumpinomap)) { ret |= HASDUMPEDFILE; if (ret & HASSUBDIRS) break; } if (TSTINO(ino, dumpdirmap)) { ret |= HASSUBDIRS; if (ret & HASDUMPEDFILE) break; } } } free(dblk); return (ret); } /* * Dump passes 3 and 4. * * Dump the contents of an inode to tape. */ void dumpino(union dinode *dp, ino_t ino) { int ind_level, cnt; off_t size; char buf[TP_BSIZE]; daddr_t blk; void *shortlink; if (newtape) { newtape = 0; dumpmap(dumpinomap, TS_BITS, ino); } CLRINO(ino, dumpinomap); /* * Zero out the size of a snapshot so that it will be dumped * as a zero length file. */ if (DIP(dp, flags) & SF_SNAPSHOT) { DIP_SET(dp, size, 0); DIP_SET(dp, flags, DIP(dp, flags) & ~SF_SNAPSHOT); } if (!is_ufs2) { if (needswap) ffs_dinode1_swap(&dp->dp1, &spcl.c_dinode); else spcl.c_dinode = dp->dp1; } else { if (needswap) ffs_dinode2_swap(&dp->dp2, &dp->dp2); spcl.c_mode = dp->dp2.di_mode; spcl.c_size = dp->dp2.di_size; spcl.c_atime = dp->dp2.di_atime; spcl.c_atimensec = dp->dp2.di_atimensec; spcl.c_mtime = dp->dp2.di_mtime; spcl.c_mtimensec = dp->dp2.di_mtimensec; spcl.c_birthtime = dp->dp2.di_birthtime; spcl.c_birthtimensec = dp->dp2.di_birthnsec; spcl.c_rdev = dp->dp2.di_rdev; spcl.c_file_flags = dp->dp2.di_flags; spcl.c_uid = dp->dp2.di_uid; spcl.c_gid = dp->dp2.di_gid; } spcl.c_type = iswap32(TS_INODE); spcl.c_count = 0; switch (DIP(dp, mode) & IFMT) { case 0: /* * Freed inode. */ return; case IFLNK: /* * Check for short symbolic link. */ if (DIP(dp, size) > 0 && #ifdef FS_44INODEFMT (DIP(dp, size) < ufsib->ufs_maxsymlinklen || (ufsib->ufs_maxsymlinklen == 0 && DIP(dp, blocks) == 0)) #else DIP(dp, blocks) == 0 #endif ) { spcl.c_addr[0] = 1; spcl.c_count = iswap32(1); writeheader(ino); if (is_ufs2) shortlink = dp->dp2.di_db; else shortlink = dp->dp1.di_db; memmove(buf, shortlink, DIP(dp, size)); buf[DIP(dp, size)] = '\0'; writerec(buf, 0); return; } /* fall through */ case IFDIR: case IFREG: if (DIP(dp, size) > 0) break; /* fall through */ case IFIFO: case IFSOCK: case IFCHR: case IFBLK: writeheader(ino); return; default: msg("Warning: undefined file type 0%o\n", DIP(dp, mode) & IFMT); return; } if (DIP(dp, size) > UFS_NDADDR * ufsib->ufs_bsize) cnt = UFS_NDADDR * ufsib->ufs_frag; else cnt = howmany(DIP(dp, size), ufsib->ufs_fsize); if (is_ufs2) blksout64(&dp->dp2.di_db[0], cnt, ino); else blksout32(&dp->dp1.di_db[0], cnt, ino); if ((size = DIP(dp, size) - UFS_NDADDR * ufsib->ufs_bsize) <= 0) return; for (ind_level = 0; ind_level < UFS_NIADDR; ind_level++) { if (is_ufs2) blk = iswap64(dp->dp2.di_ib[ind_level]); else blk = iswap32(dp->dp1.di_ib[ind_level]); dmpindir(ino, blk, ind_level, &size); if (size <= 0) return; } } /* * Read indirect blocks, and pass the data blocks to be dumped. */ static void dmpindir(ino_t ino, daddr_t blk, int ind_level, off_t *size) { int i, cnt; union { int32_t i32[MAXBSIZE / sizeof (int32_t)]; int64_t i64[MAXBSIZE / sizeof (int64_t)]; } idblk; daddr_t iblk; if (blk != 0) bread(fsatoda(ufsib, blk), (char *)&idblk, (int) ufsib->ufs_bsize); else memset(&idblk, 0, (int)ufsib->ufs_bsize); if (ind_level <= 0) { if (*size < ufsib->ufs_nindir * ufsib->ufs_bsize) cnt = howmany(*size, ufsib->ufs_fsize); else cnt = ufsib->ufs_nindir * ufsib->ufs_frag; *size -= ufsib->ufs_nindir * ufsib->ufs_bsize; if (is_ufs2) blksout64(&idblk.i64[0], cnt, ino); else blksout32(&idblk.i32[0], cnt, ino); return; } ind_level--; for (i = 0; i < ufsib->ufs_nindir; i++) { if (is_ufs2) iblk = iswap64(idblk.i64[i]); else iblk = iswap32(idblk.i32[i]); dmpindir(ino, iblk, ind_level, size); if (*size <= 0) return; } } /* * Collect up the data into tape record sized buffers and output them. */ void blksout32(int32_t *blkp, int frags, ino_t ino) { int32_t *bp; int i, j, count, blks, tbperdb; blks = howmany(frags * ufsib->ufs_fsize, TP_BSIZE); tbperdb = ufsib->ufs_bsize >> tp_bshift; for (i = 0; i < blks; i += TP_NINDIR) { if (i + TP_NINDIR > blks) count = blks; else count = i + TP_NINDIR; for (j = i; j < count; j++) if (blkp[j / tbperdb] != 0) spcl.c_addr[j - i] = 1; else spcl.c_addr[j - i] = 0; spcl.c_count = iswap32(count - i); writeheader(ino); bp = &blkp[i / tbperdb]; for (j = i; j < count; j += tbperdb, bp++) if (*bp != 0) { if (j + tbperdb <= count) dumpblock(iswap32(*bp), (int)ufsib->ufs_bsize); else dumpblock(iswap32(*bp), (count - j) * TP_BSIZE); } spcl.c_type = iswap32(TS_ADDR); } } void blksout64(int64_t *blkp, int frags, ino_t ino) { int64_t *bp; int i, j, count, blks, tbperdb; blks = howmany(frags * ufsib->ufs_fsize, TP_BSIZE); tbperdb = ufsib->ufs_bsize >> tp_bshift; for (i = 0; i < blks; i += TP_NINDIR) { if (i + TP_NINDIR > blks) count = blks; else count = i + TP_NINDIR; for (j = i; j < count; j++) if (blkp[j / tbperdb] != 0) spcl.c_addr[j - i] = 1; else spcl.c_addr[j - i] = 0; spcl.c_count = iswap32(count - i); writeheader(ino); bp = &blkp[i / tbperdb]; for (j = i; j < count; j += tbperdb, bp++) if (*bp != 0) { if (j + tbperdb <= count) dumpblock(iswap64(*bp), (int)ufsib->ufs_bsize); else dumpblock(iswap64(*bp), (count - j) * TP_BSIZE); } spcl.c_type = iswap32(TS_ADDR); } } /* * Dump a map to the tape. */ void dumpmap(char *map, int type, ino_t ino) { int i; char *cp; spcl.c_type = iswap32(type); spcl.c_count = iswap32(howmany(mapsize * sizeof(char), TP_BSIZE)); writeheader(ino); for (i = 0, cp = map; i < iswap32(spcl.c_count); i++, cp += TP_BSIZE) writerec(cp, 0); } /* * Write a header record to the dump tape. */ void writeheader(ino_t ino) { int32_t sum, cnt, *lp; spcl.c_inumber = iswap32(ino); if (is_ufs2) spcl.c_magic = iswap32(FS_UFS2_MAGIC); else { spcl.c_magic = iswap32(NFS_MAGIC); spcl.c_old_date = iswap32(iswap64(spcl.c_date)); spcl.c_old_ddate = iswap32(iswap64(spcl.c_ddate)); spcl.c_old_tapea = iswap32(iswap64(spcl.c_tapea)); spcl.c_old_firstrec = iswap32(iswap64(spcl.c_firstrec)); } spcl.c_checksum = 0; lp = (int32_t *)&spcl; sum = 0; cnt = sizeof(union u_spcl) / (4 * sizeof(int32_t)); while (--cnt >= 0) { sum += iswap32(*lp++); sum += iswap32(*lp++); sum += iswap32(*lp++); sum += iswap32(*lp++); } spcl.c_checksum = iswap32(CHECKSUM - sum); writerec((char *)&spcl, 1); }