/* mkfs - make the MINIX filesystem Authors: Tanenbaum et al. */ /* Authors: Andy Tanenbaum, Paul Ogilvie, Frans Meulenbroeks, Bruce Evans * * This program can make both version 1 and version 2 file systems, as follows: * mkfs /dev/fd0 1200 # Version 2 (default) * mkfs -1 /dev/fd0 360 # Version 1 * */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "../../servers/fs/const.h" #if (MACHINE == IBM_PC) #include #include #include #endif #include #include #include #undef EXTERN #define EXTERN /* get rid of EXTERN by making it null */ #include "../../servers/fs/type.h" #include "../../servers/fs/super.h" #include #ifndef max #define max(a,b) ((a) > (b) ? (a) : (b)) #endif #ifndef DOS #ifndef UNIX #define UNIX #endif #endif #define INODE_MAP 2 #define MAX_TOKENS 10 #define LINE_LEN 200 #define BIN 2 #define BINGRP 2 #define BIT_MAP_SHIFT 13 #define N_BLOCKS MAX_BLOCK_NR #define N_BLOCKS16 (128L * 1024) #define INODE_MAX ((unsigned) 65535) /* You can make a really large file system on a 16-bit system, but the array * of bits that get_block()/putblock() needs gets a bit big, so we can only * prefill MAX_INIT blocks. (16-bit fsck can't check a file system larger * than N_BLOCKS16 anyway.) */ #define MAX_INIT (sizeof(char *) == 2 ? N_BLOCKS16 : N_BLOCKS) #ifdef DOS maybedefine O_RDONLY 4 /* O_RDONLY | BINARY_BIT */ maybedefine BWRITE 5 /* O_WRONLY | BINARY_BIT */ #endif #if (MACHINE == ATARI) int isdev; #endif extern char *optarg; extern int optind; int next_zone, next_inode, zone_size, zone_shift = 0, zoff; block_t nrblocks; int inode_offset, lct = 0, disk, fd, print = 0, file = 0; unsigned int nrinodes; int override = 0, simple = 0, dflag; int donttest; /* skip test if it fits on medium */ char *progname; long current_time, bin_time; char *zero, *lastp; char umap[MAX_INIT / 8]; /* bit map tells if block read yet */ block_t zone_map; /* where is zone map? (depends on # inodes) */ int inodes_per_block; int fs_version; unsigned int block_size; block_t max_nrblocks; FILE *proto; _PROTOTYPE(int main, (int argc, char **argv)); _PROTOTYPE(block_t sizeup, (char *device)); _PROTOTYPE(void super, (zone_t zones, Ino_t inodes)); _PROTOTYPE(void rootdir, (Ino_t inode)); _PROTOTYPE(void eat_dir, (Ino_t parent)); _PROTOTYPE(void eat_file, (Ino_t inode, int f)); _PROTOTYPE(void enter_dir, (Ino_t parent, char *name, Ino_t child)); _PROTOTYPE(void incr_size, (Ino_t n, long count)); _PROTOTYPE(PRIVATE ino_t alloc_inode, (int mode, int usrid, int grpid)); _PROTOTYPE(PRIVATE zone_t alloc_zone, (void)); _PROTOTYPE(void add_zone, (Ino_t n, zone_t z, long bytes, long cur_time)); _PROTOTYPE(void add_z_1, (Ino_t n, zone_t z, long bytes, long cur_time)); _PROTOTYPE(void add_z_2, (Ino_t n, zone_t z, long bytes, long cur_time)); _PROTOTYPE(void incr_link, (Ino_t n)); _PROTOTYPE(void insert_bit, (block_t block, int bit)); _PROTOTYPE(int mode_con, (char *p)); _PROTOTYPE(void getline, (char line[LINE_LEN], char *parse[MAX_TOKENS])); _PROTOTYPE(void check_mtab, (char *devname)); _PROTOTYPE(long file_time, (int f)); _PROTOTYPE(void pexit, (char *s)); _PROTOTYPE(void copy, (char *from, char *to, int count)); _PROTOTYPE(void print_fs, (void)); _PROTOTYPE(int read_and_set, (block_t n)); _PROTOTYPE(void special, (char *string)); _PROTOTYPE(void get_block, (block_t n, char *buf)); _PROTOTYPE(void get_super_block, (char *buf)); _PROTOTYPE(void put_block, (block_t n, char *buf)); _PROTOTYPE(void cache_init, (void)); _PROTOTYPE(void flush, (void)); _PROTOTYPE(void mx_read, (int blocknr, char *buf)); _PROTOTYPE(void mx_write, (int blocknr, char *buf)); _PROTOTYPE(void dexit, (char *s, int sectnum, int err)); _PROTOTYPE(void usage, (void)); _PROTOTYPE(char *alloc_block, (void)); /*================================================================ * mkfs - make filesystem *===============================================================*/ int main(argc, argv) int argc; char *argv[]; { int nread, mode, usrid, grpid, ch; block_t blocks, maxblocks; block_t i; ino_t root_inum; ino_t inodes; zone_t zones; char *token[MAX_TOKENS], line[LINE_LEN]; struct stat statbuf; /* Get two times, the current time and the mod time of the binary of * mkfs itself. When the -d flag is used, the later time is put into * the i_mtimes of all the files. This feature is useful when * producing a set of file systems, and one wants all the times to be * identical. First you set the time of the mkfs binary to what you * want, then go. */ current_time = time((time_t *) 0); /* time mkfs is being run */ stat(argv[0], &statbuf); bin_time = statbuf.st_mtime; /* time when mkfs binary was last modified */ /* Process switches. */ progname = argv[0]; blocks = 0; i = 0; fs_version = 3; inodes_per_block = 0; max_nrblocks = N_BLOCKS; block_size = 0; while ((ch = getopt(argc, argv, "12b:di:lotB:")) != EOF) switch (ch) { case '1': fs_version = 1; inodes_per_block = V1_INODES_PER_BLOCK; max_nrblocks = 0xFFFF; break; case '2': fs_version = 2; break; case 'b': blocks = strtoul(optarg, (char **) NULL, 0); break; case 'd': dflag = 1; current_time = bin_time; break; case 'i': i = strtoul(optarg, (char **) NULL, 0); break; case 'l': print = 1; break; case 'o': override = 1; break; case 't': donttest = 1; break; case 'B': block_size = atoi(optarg); break; default: usage(); } if(fs_version == 3) { if(!block_size) block_size = 8192; /* V3 default block size */ if(block_size%SECTOR_SIZE || block_size < MIN_BLOCK_SIZE) { fprintf(stderr, "block size must be multiple of sector (%d) " "and at least %d bytes\n", SECTOR_SIZE, MIN_BLOCK_SIZE); pexit("specified block size illegal"); } if(block_size%V2_INODE_SIZE) { fprintf(stderr, "block size must be a multiple of inode size (%d bytes)\n", V2_INODE_SIZE); pexit("specified block size illegal"); } } else { if(block_size) { pexit("Can't specify a block size if FS version is <3"); } block_size = STATIC_BLOCK_SIZE; /* V1/V2 block size */ } if(!inodes_per_block) inodes_per_block = V2_INODES_PER_BLOCK(block_size); /* now that the block size is known, do buffer allocations where * possible. */ zero = alloc_block(); bzero(zero, block_size); /* Determine the size of the device if not specified as -b or proto. */ maxblocks = sizeup(argv[optind]); if (argc - optind == 1 && blocks == 0) { blocks = maxblocks; /* blocks == 0 is checked later, but leads to a funny way of * reporting a 0-sized device (displays usage). */ if(blocks < 1) { fprintf(stderr, "%s: this device can't hold a filesystem.\n", progname); return 1; } } /* The remaining args must be 'special proto', or just 'special' if the * no. of blocks has already been specified. */ if (argc - optind != 2 && (argc - optind != 1 || blocks == 0)) usage(); if (blocks > maxblocks) { fprintf(stderr, "%s: %s: number of blocks too large for device.\n", progname, argv[optind]); return 1; } /* Check special. */ check_mtab(argv[optind]); /* Check and start processing proto. */ optarg = argv[++optind]; if (optind < argc && (proto = fopen(optarg, "r")) != NULL) { /* Prototype file is readable. */ lct = 1; getline(line, token); /* skip boot block info */ /* Read the line with the block and inode counts. */ getline(line, token); blocks = atol(token[0]); if (blocks > max_nrblocks) pexit("Block count too large"); if (sizeof(char *) == 2 && blocks > N_BLOCKS16) { fprintf(stderr, "%s: warning: FS is larger than the %dM that fsck can check!\n", progname, (int) (N_BLOCKS16 / (1024L * 1024))); } inodes = atoi(token[1]); /* Process mode line for root directory. */ getline(line, token); mode = mode_con(token[0]); usrid = atoi(token[1]); grpid = atoi(token[2]); } else { lct = 0; if (optind < argc) { /* Maybe the prototype file is just a size. Check. */ blocks = strtoul(optarg, (char **) NULL, 0); if (blocks == 0) pexit("Can't open prototype file"); } if (i == 0) { int kb; kb = blocks * (max(block_size,1024) / 1024); /* The default for inodes is 2 blocks per kb, rounded up * to fill an inode block. Above 20M, the average files are * sure to be larger because it is hard to fill up 20M with * tiny files, so reduce the default number of inodes. This * default can always be overridden by using the '-i option. */ i = kb / 2; if (kb >= 20000) i = kb / 3; if (kb >= 40000) i = kb / 4; if (kb >= 60000) i = kb / 5; if (kb >= 80000) i = kb / 6; if (kb >= 100000) i = kb / 7; /* round up to fill inode block */ i += inodes_per_block - 1; i = i / inodes_per_block * inodes_per_block; if (i > INODE_MAX && fs_version < 3) i = INODE_MAX; } if (blocks < 5) pexit("Block count too small"); if (blocks > max_nrblocks) pexit("Block count too large"); if (i < 1) pexit("Inode count too small"); if (i > INODE_MAX && fs_version < 3) pexit("Inode count too large"); inodes = (ino_t) i; /* Make simple file system of the given size, using defaults. */ mode = 040777; usrid = BIN; grpid = BINGRP; simple = 1; } nrblocks = blocks; nrinodes = inodes; /* Open special. */ special(argv[--optind]); #ifdef UNIX if(ULONG_MAX / block_size <= blocks-1) { fprintf(stderr, "Device too big for filesystem to currently run on (max 4GB).\n"); return 1; } if (!donttest) { short *testb; ssize_t w; testb = (short *) alloc_block(); /* Try writing the last block of partition or diskette. */ if(lseek(fd, (off_t) (blocks - 1) * block_size, SEEK_SET) < 0) { pexit("couldn't seek to last block to test size (1)"); } testb[0] = 0x3245; testb[1] = 0x11FF; testb[block_size-1] = 0x1F2F; if ((w=write(fd, (char *) testb, block_size)) != block_size) { if(w < 0) perror("write"); printf("%d/%d\n", w, block_size); pexit("File system is too big for minor device (write)"); } sync(); /* flush write, so if error next read fails */ if(lseek(fd, (off_t) (blocks - 1) * block_size, SEEK_SET) < 0) { pexit("couldn't seek to last block to test size (2)"); } testb[0] = 0; testb[1] = 0; nread = read(fd, (char *) testb, block_size); if (nread != block_size || testb[0] != 0x3245 || testb[1] != 0x11FF || testb[block_size-1] != 0x1F2F) { if(nread < 0) perror("read"); pexit("File system is too big for minor device (read)"); } lseek(fd, (off_t) (blocks - 1) * block_size, SEEK_SET); testb[0] = 0; testb[1] = 0; if (write(fd, (char *) testb, block_size) != block_size) pexit("File system is too big for minor device (write2)"); lseek(fd, 0L, SEEK_SET); free(testb); } #endif /* Make the file-system */ cache_init(); #if (MACHINE == ATARI) if (isdev) { char block0[BLOCK_SIZE]; get_block((block_t) 0, block0); /* Need to read twice; first time gets an empty block */ get_block((block_t) 0, block0); /* Zero parts of the boot block so the disk won't be * recognized as a tos disk any more. */ block0[0] = block0[1] = 0; /* branch code to boot code */ strncpy(&block0[2], "MINIX ", (size_t) 6); block0[16] = 0; /* number of FATS */ block0[17] = block0[18] = 0; /* number of dir entries */ block0[22] = block0[23] = 0; /* sectors/FAT */ bzero(&block0[30], 480);/* boot code */ put_block((block_t) 0, block0); } else #endif put_block((block_t) 0, zero); /* Write a null boot block. */ zone_shift = 0; /* for future use */ zones = nrblocks >> zone_shift; super(zones, inodes); root_inum = alloc_inode(mode, usrid, grpid); rootdir(root_inum); if (simple == 0) eat_dir(root_inum); if (print) print_fs(); flush(); return(0); /* NOTREACHED */ } /* end main */ /*================================================================ * sizeup - determine device size *===============================================================*/ block_t sizeup(device) char *device; { int fd; struct partition entry; block_t d; if ((fd = open(device, O_RDONLY)) == -1) { perror("sizeup open"); return 0; } if (ioctl(fd, DIOCGETP, &entry) == -1) { perror("sizeup ioctl"); entry.size = cvu64(0); } close(fd); d = div64u(entry.size, block_size); return d; } /*================================================================ * super - construct a superblock *===============================================================*/ void super(zones, inodes) zone_t zones; ino_t inodes; { unsigned int i; int inodeblks; int initblks; zone_t initzones, nrzones, v1sq, v2sq; zone_t zo; struct super_block *sup; char *buf, *cp; buf = alloc_block(); for (cp = buf; cp < &buf[block_size]; cp++) *cp = 0; sup = (struct super_block *) buf; /* lint - might use a union */ sup->s_ninodes = inodes; if (fs_version == 1) { sup->s_nzones = zones; } else { sup->s_nzones = 0; /* not used in V2 - 0 forces errors early */ sup->s_zones = zones; } sup->s_imap_blocks = bitmapsize((bit_t) (1 + inodes), block_size); sup->s_zmap_blocks = bitmapsize((bit_t) zones, block_size); inode_offset = sup->s_imap_blocks + sup->s_zmap_blocks + 2; inodeblks = (inodes + inodes_per_block - 1) / inodes_per_block; initblks = inode_offset + inodeblks; initzones = (initblks + (1 << zone_shift) - 1) >> zone_shift; nrzones = nrblocks >> zone_shift; sup->s_firstdatazone = (initblks + (1 << zone_shift) - 1) >> zone_shift; zoff = sup->s_firstdatazone - 1; sup->s_log_zone_size = zone_shift; if (fs_version == 1) { sup->s_magic = SUPER_MAGIC; /* identify super blocks */ v1sq = (zone_t) V1_INDIRECTS * V1_INDIRECTS; zo = V1_NR_DZONES + (long) V1_INDIRECTS + v1sq; sup->s_max_size = zo * block_size; } else { v2sq = (zone_t) V2_INDIRECTS(block_size) * V2_INDIRECTS(block_size); zo = V2_NR_DZONES + (zone_t) V2_INDIRECTS(block_size) + v2sq; if(fs_version == 2) { sup->s_magic = SUPER_V2;/* identify super blocks */ sup->s_max_size = zo * block_size; } else { sup->s_magic = SUPER_V3; sup->s_block_size = block_size; sup->s_disk_version = 0; #define MAX_MAX_SIZE ((unsigned long) 0xffffffff) if(MAX_MAX_SIZE/block_size < zo) { sup->s_max_size = MAX_MAX_SIZE; } else { sup->s_max_size = zo * block_size; } } } zone_size = 1 << zone_shift; /* nr of blocks per zone */ if (lseek(fd, (off_t) STATIC_BLOCK_SIZE, SEEK_SET) == (off_t) -1) { pexit("super() couldn't seek"); } if (write(fd, buf, STATIC_BLOCK_SIZE) != STATIC_BLOCK_SIZE) { pexit("super() couldn't write"); } /* Clear maps and inodes. */ for (i = 2; i < initblks; i++) put_block((block_t) i, zero); next_zone = sup->s_firstdatazone; next_inode = 1; zone_map = INODE_MAP + sup->s_imap_blocks; insert_bit(zone_map, 0); /* bit zero must always be allocated */ insert_bit((block_t) INODE_MAP, 0); /* inode zero not used but * must be allocated */ free(buf); } /*================================================================ * rootdir - install the root directory *===============================================================*/ void rootdir(inode) ino_t inode; { zone_t z; z = alloc_zone(); add_zone(inode, z, 2 * sizeof(struct direct), current_time); enter_dir(inode, ".", inode); enter_dir(inode, "..", inode); incr_link(inode); incr_link(inode); } /*================================================================ * eat_dir - recursively install directory *===============================================================*/ void eat_dir(parent) ino_t parent; { /* Read prototype lines and set up directory. Recurse if need be. */ char *token[MAX_TOKENS], *p; char line[LINE_LEN]; int mode, usrid, grpid, maj, min, f; ino_t n; zone_t z; long size; while (1) { getline(line, token); p = token[0]; if (*p == '$') return; p = token[1]; mode = mode_con(p); usrid = atoi(token[2]); grpid = atoi(token[3]); if (grpid & 0200) fprintf(stderr, "A.S.Tanenbaum\n"); n = alloc_inode(mode, usrid, grpid); /* Enter name in directory and update directory's size. */ enter_dir(parent, token[0], n); incr_size(parent, sizeof(struct direct)); /* Check to see if file is directory or special. */ incr_link(n); if (*p == 'd') { /* This is a directory. */ z = alloc_zone(); /* zone for new directory */ add_zone(n, z, 2 * sizeof(struct direct), current_time); enter_dir(n, ".", n); enter_dir(n, "..", parent); incr_link(parent); incr_link(n); eat_dir(n); } else if (*p == 'b' || *p == 'c') { /* Special file. */ maj = atoi(token[4]); min = atoi(token[5]); size = 0; if (token[6]) size = atoi(token[6]); size = block_size * size; add_zone(n, (zone_t) ((maj << 8) | min), size, current_time); } else { /* Regular file. Go read it. */ if ((f = open(token[4], O_RDONLY)) < 0) { fprintf(stderr, "%s: Can't open %s: %s\n", progname, token[4], strerror(errno)); } else eat_file(n, f); } } } /*================================================================ * eat_file - copy file to MINIX *===============================================================*/ /* Zonesize >= blocksize */ void eat_file(inode, f) ino_t inode; int f; { int ct, i, j, k; zone_t z; char *buf; long timeval; buf = alloc_block(); do { for (i = 0, j = 0; i < zone_size; i++, j += ct) { for (k = 0; k < block_size; k++) buf[k] = 0; if ((ct = read(f, buf, block_size)) > 0) { if (i == 0) z = alloc_zone(); put_block((z << zone_shift) + i, buf); } } timeval = (dflag ? current_time : file_time(f)); if (ct) add_zone(inode, z, (long) j, timeval); } while (ct == block_size); close(f); } /*================================================================ * directory & inode management assist group *===============================================================*/ void enter_dir(parent, name, child) ino_t parent, child; char *name; { /* Enter child in parent directory */ /* Works for dir > 1 block and zone > block */ int i, j, k, l, off; block_t b; zone_t z; char *p1, *p2; struct direct *dir_entry; d1_inode ino1[V1_INODES_PER_BLOCK]; d2_inode *ino2; int nr_dzones; b = ((parent - 1) / inodes_per_block) + inode_offset; off = (parent - 1) % inodes_per_block; if(!(dir_entry = malloc(NR_DIR_ENTRIES(block_size) * sizeof(*dir_entry)))) pexit("couldn't allocate directory entry"); if(!(ino2 = malloc(V2_INODES_PER_BLOCK(block_size) * sizeof(*ino2)))) pexit("couldn't allocate block of inodes entry"); if (fs_version == 1) { get_block(b, (char *) ino1); nr_dzones = V1_NR_DZONES; } else { get_block(b, (char *) ino2); nr_dzones = V2_NR_DZONES; } for (k = 0; k < nr_dzones; k++) { if (fs_version == 1) { z = ino1[off].d1_zone[k]; if (z == 0) { z = alloc_zone(); ino1[off].d1_zone[k] = z; } } else { z = ino2[off].d2_zone[k]; if (z == 0) { z = alloc_zone(); ino2[off].d2_zone[k] = z; } } for (l = 0; l < zone_size; l++) { get_block((z << zone_shift) + l, (char *) dir_entry); for (i = 0; i < NR_DIR_ENTRIES(block_size); i++) { if (dir_entry[i].d_ino == 0) { dir_entry[i].d_ino = child; p1 = name; p2 = dir_entry[i].d_name; j = sizeof(dir_entry[i].d_name); while (j--) { *p2++ = *p1; if (*p1 != 0) p1++; } put_block((z << zone_shift) + l, (char *) dir_entry); if (fs_version == 1) { put_block(b, (char *) ino1); } else { put_block(b, (char *) ino2); } free(dir_entry); free(ino2); return; } } } } printf("Directory-inode %d beyond direct blocks. Could not enter %s\n", parent, name); pexit("Halt"); } void add_zone(n, z, bytes, cur_time) ino_t n; zone_t z; long bytes, cur_time; { if (fs_version == 1) { add_z_1(n, z, bytes, cur_time); } else { add_z_2(n, z, bytes, cur_time); } } void add_z_1(n, z, bytes, cur_time) ino_t n; zone_t z; long bytes, cur_time; { /* Add zone z to inode n. The file has grown by 'bytes' bytes. */ int off, i; block_t b; zone_t indir; zone1_t blk[V1_INDIRECTS]; d1_inode *p; d1_inode inode[V1_INODES_PER_BLOCK]; b = ((n - 1) / V1_INODES_PER_BLOCK) + inode_offset; off = (n - 1) % V1_INODES_PER_BLOCK; get_block(b, (char *) inode); p = &inode[off]; p->d1_size += bytes; p->d1_mtime = cur_time; for (i = 0; i < V1_NR_DZONES; i++) if (p->d1_zone[i] == 0) { p->d1_zone[i] = (zone1_t) z; put_block(b, (char *) inode); return; } put_block(b, (char *) inode); /* File has grown beyond a small file. */ if (p->d1_zone[V1_NR_DZONES] == 0) p->d1_zone[V1_NR_DZONES] = (zone1_t) alloc_zone(); indir = p->d1_zone[V1_NR_DZONES]; put_block(b, (char *) inode); b = indir << zone_shift; get_block(b, (char *) blk); for (i = 0; i < V1_INDIRECTS; i++) if (blk[i] == 0) { blk[i] = (zone1_t) z; put_block(b, (char *) blk); return; } pexit("File has grown beyond single indirect"); } void add_z_2(n, z, bytes, cur_time) ino_t n; zone_t z; long bytes, cur_time; { /* Add zone z to inode n. The file has grown by 'bytes' bytes. */ int off, i; block_t b; zone_t indir; zone_t *blk; d2_inode *p; d2_inode *inode; if(!(blk = malloc(V2_INDIRECTS(block_size)*sizeof(*blk)))) pexit("Couldn't allocate indirect block"); if(!(inode = malloc(V2_INODES_PER_BLOCK(block_size)*sizeof(*inode)))) pexit("Couldn't allocate block of inodes"); b = ((n - 1) / V2_INODES_PER_BLOCK(block_size)) + inode_offset; off = (n - 1) % V2_INODES_PER_BLOCK(block_size); get_block(b, (char *) inode); p = &inode[off]; p->d2_size += bytes; p->d2_mtime = cur_time; for (i = 0; i < V2_NR_DZONES; i++) if (p->d2_zone[i] == 0) { p->d2_zone[i] = z; put_block(b, (char *) inode); free(blk); free(inode); return; } put_block(b, (char *) inode); /* File has grown beyond a small file. */ if (p->d2_zone[V2_NR_DZONES] == 0) p->d2_zone[V2_NR_DZONES] = alloc_zone(); indir = p->d2_zone[V2_NR_DZONES]; put_block(b, (char *) inode); b = indir << zone_shift; get_block(b, (char *) blk); for (i = 0; i < V2_INDIRECTS(block_size); i++) if (blk[i] == 0) { blk[i] = z; put_block(b, (char *) blk); free(blk); free(inode); return; } pexit("File has grown beyond single indirect"); } void incr_link(n) ino_t n; { /* Increment the link count to inode n */ int off; block_t b; b = ((n - 1) / inodes_per_block) + inode_offset; off = (n - 1) % inodes_per_block; if (fs_version == 1) { d1_inode inode1[V1_INODES_PER_BLOCK]; get_block(b, (char *) inode1); inode1[off].d1_nlinks++; put_block(b, (char *) inode1); } else { d2_inode *inode2; if(!(inode2 = malloc(V2_INODES_PER_BLOCK(block_size)))) pexit("couldn't allocate a block of inodes"); get_block(b, (char *) inode2); inode2[off].d2_nlinks++; put_block(b, (char *) inode2); free(inode2); } } void incr_size(n, count) ino_t n; long count; { /* Increment the file-size in inode n */ block_t b; int off; b = ((n - 1) / inodes_per_block) + inode_offset; off = (n - 1) % inodes_per_block; if (fs_version == 1) { d1_inode inode1[V1_INODES_PER_BLOCK]; get_block(b, (char *) inode1); inode1[off].d1_size += count; put_block(b, (char *) inode1); } else { d2_inode *inode2; if(!(inode2 = malloc(V2_INODES_PER_BLOCK(block_size)))) pexit("couldn't allocate a block of inodes"); get_block(b, (char *) inode2); inode2[off].d2_size += count; put_block(b, (char *) inode2); free(inode2); } } /*================================================================ * allocation assist group *===============================================================*/ PRIVATE ino_t alloc_inode(mode, usrid, grpid) int mode, usrid, grpid; { ino_t num; int off; block_t b; num = next_inode++; if (num > nrinodes) pexit("File system does not have enough inodes"); b = ((num - 1) / inodes_per_block) + inode_offset; off = (num - 1) % inodes_per_block; if (fs_version == 1) { d1_inode inode1[V1_INODES_PER_BLOCK]; get_block(b, (char *) inode1); inode1[off].d1_mode = mode; inode1[off].d1_uid = usrid; inode1[off].d1_gid = grpid; put_block(b, (char *) inode1); } else { d2_inode *inode2; if(!(inode2 = malloc(V2_INODES_PER_BLOCK(block_size)))) pexit("couldn't allocate a block of inodes"); get_block(b, (char *) inode2); inode2[off].d2_mode = mode; inode2[off].d2_uid = usrid; inode2[off].d2_gid = grpid; put_block(b, (char *) inode2); free(inode2); } /* Set the bit in the bit map. */ /* DEBUG FIXME. This assumes the bit is in the first inode map block. */ insert_bit((block_t) INODE_MAP, (int) num); return(num); } PRIVATE zone_t alloc_zone() { /* Allocate a new zone */ /* Works for zone > block */ block_t b; int i; zone_t z; z = next_zone++; b = z << zone_shift; if ((b + zone_size) > nrblocks) pexit("File system not big enough for all the files"); for (i = 0; i < zone_size; i++) put_block(b + i, zero); /* give an empty zone */ /* DEBUG FIXME. This assumes the bit is in the first zone map block. */ insert_bit(zone_map, (int) (z - zoff)); /* lint, NOT OK because * z hasn't been broken * up into block + * offset yet. */ return(z); } void insert_bit(block, bit) block_t block; int bit; { /* Insert 'count' bits in the bitmap */ int w, s; short *buf; buf = (short *) alloc_block(); if (block < 0) pexit("insert_bit called with negative argument"); get_block(block, (char *) buf); w = bit / (8 * sizeof(short)); s = bit % (8 * sizeof(short)); buf[w] |= (1 << s); put_block(block, (char *) buf); free(buf); } /*================================================================ * proto-file processing assist group *===============================================================*/ int mode_con(p) char *p; { /* Convert string to mode */ int o1, o2, o3, mode; char c1, c2, c3; c1 = *p++; c2 = *p++; c3 = *p++; o1 = *p++ - '0'; o2 = *p++ - '0'; o3 = *p++ - '0'; mode = (o1 << 6) | (o2 << 3) | o3; if (c1 == 'd') mode += I_DIRECTORY; if (c1 == 'b') mode += I_BLOCK_SPECIAL; if (c1 == 'c') mode += I_CHAR_SPECIAL; if (c1 == '-') mode += I_REGULAR; if (c2 == 'u') mode += I_SET_UID_BIT; if (c3 == 'g') mode += I_SET_GID_BIT; return(mode); } void getline(line, parse) char *parse[MAX_TOKENS]; char line[LINE_LEN]; { /* Read a line and break it up in tokens */ int k; char c, *p; int d; for (k = 0; k < MAX_TOKENS; k++) parse[k] = 0; for (k = 0; k < LINE_LEN; k++) line[k] = 0; k = 0; parse[0] = 0; p = line; while (1) { if (++k > LINE_LEN) pexit("Line too long"); d = fgetc(proto); if (d == EOF) pexit("Unexpected end-of-file"); *p = d; if (*p == '\n') lct++; if (*p == ' ' || *p == '\t') *p = 0; if (*p == '\n') { *p++ = 0; *p = '\n'; break; } p++; } k = 0; p = line; lastp = line; while (1) { c = *p++; if (c == '\n') return; if (c == 0) continue; parse[k++] = p - 1; do { c = *p++; } while (c != 0 && c != '\n'); } } /*================================================================ * other stuff *===============================================================*/ void check_mtab(devname) char *devname; /* /dev/hd1 or whatever */ { /* Check to see if the special file named in s is mounted. */ int n; char special[PATH_MAX + 1], mounted_on[PATH_MAX + 1], version[10], rw_flag[10]; if (load_mtab("mkfs") < 0) return; while (1) { n = get_mtab_entry(special, mounted_on, version, rw_flag); if (n < 0) return; if (strcmp(devname, special) == 0) { /* Can't mkfs on top of a mounted file system. */ fprintf(stderr, "%s: %s is mounted on %s\n", progname, devname, mounted_on); exit(1); } } } long file_time(f) int f; { #ifdef UNIX struct stat statbuf; fstat(f, &statbuf); return(statbuf.st_mtime); #else /* fstat not supported by DOS */ return(0L); #endif } void pexit(s) char *s; { fprintf(stderr, "%s: %s\n", progname, s); if (lct != 0) fprintf(stderr, "Line %d being processed when error detected.\n", lct); flush(); exit(2); } void copy(from, to, count) char *from, *to; int count; { while (count--) *to++ = *from++; } char *alloc_block() { char *buf; if(!(buf = malloc(block_size))) { pexit("couldn't allocate filesystem buffer"); } bzero(buf, block_size); return buf; } void print_fs() { int i, j; ino_t k; d1_inode inode1[V1_INODES_PER_BLOCK]; d2_inode *inode2; unsigned short *usbuf; block_t b, inode_limit; struct direct *dir; if(!(inode2 = malloc(V2_INODES_PER_BLOCK(block_size)))) pexit("couldn't allocate a block of inodes"); if(!(dir = malloc(NR_DIR_ENTRIES(block_size)*sizeof(*dir)))) pexit("malloc of directory entry failed"); usbuf = (unsigned short *) alloc_block(); get_super_block((char *) usbuf); printf("\nSuperblock: "); for (i = 0; i < 8; i++) printf("%06o ", usbuf[i]); get_block((block_t) 2, (char *) usbuf); printf("...\nInode map: "); for (i = 0; i < 9; i++) printf("%06o ", usbuf[i]); get_block((block_t) 3, (char *) usbuf); printf("...\nZone map: "); for (i = 0; i < 9; i++) printf("%06o ", usbuf[i]); printf("...\n"); free(usbuf); usbuf = NULL; k = 0; for (b = inode_offset; k < nrinodes; b++) { if (fs_version == 1) { get_block(b, (char *) inode1); } else { get_block(b, (char *) inode2); } for (i = 0; i < inodes_per_block; i++) { k = inodes_per_block * (int) (b - inode_offset) + i + 1; /* Lint but OK */ if (k > nrinodes) break; if (fs_version == 1) { if (inode1[i].d1_mode != 0) { printf("Inode %2d: mode=", k); printf("%06o", inode1[i].d1_mode); printf(" uid=%2d gid=%2d size=", inode1[i].d1_uid, inode1[i].d1_gid); printf("%6ld", inode1[i].d1_size); printf(" zone[0]=%d\n", inode1[i].d1_zone[0]); } if ((inode1[i].d1_mode & I_TYPE) == I_DIRECTORY) { /* This is a directory */ get_block(inode1[i].d1_zone[0], (char *) dir); for (j = 0; j < NR_DIR_ENTRIES(block_size); j++) if (dir[j].d_ino) printf("\tInode %2d: %s\n", dir[j].d_ino, dir[j].d_name); } } else { if (inode2[i].d2_mode != 0) { printf("Inode %2d: mode=", k); printf("%06o", inode2[i].d2_mode); printf(" uid=%2d gid=%2d size=", inode2[i].d2_uid, inode2[i].d2_gid); printf("%6ld", inode2[i].d2_size); printf(" zone[0]=%ld\n", inode2[i].d2_zone[0]); } if ((inode2[i].d2_mode & I_TYPE) == I_DIRECTORY) { /* This is a directory */ get_block(inode2[i].d2_zone[0], (char *) dir); for (j = 0; j < NR_DIR_ENTRIES(block_size); j++) if (dir[j].d_ino) printf("\tInode %2d: %s\n", dir[j].d_ino, dir[j].d_name); } } } } printf("%d inodes used. %d zones used.\n", next_inode - 1, next_zone); free(dir); free(inode2); } int read_and_set(n) block_t n; { /* The first time a block is read, it returns all 0s, unless there has * been a write. This routine checks to see if a block has been accessed. */ int w, s, mask, r; if (sizeof(char *) == 2 && n >= MAX_INIT) pexit("can't initialize past 128M"); w = n / 8; s = n % 8; mask = 1 << s; r = (umap[w] & mask ? 1 : 0); umap[w] |= mask; return(r); } void usage() { fprintf(stderr, "Usage: %s [-12dlot] [-b blocks] [-i inodes] [-B blocksize] special [proto]\n", progname); exit(1); } /*================================================================ * get_block & put_block for MS-DOS *===============================================================*/ #ifdef DOS /* * These are the get_block and put_block routines * when compiling & running mkfs.c under MS-DOS. * * It requires the (asembler) routines absread & abswrite * from the file diskio.asm. Since these routines just do * as they are told (read & write the sector specified), * a local cache is used to minimize the i/o-overhead for * frequently used blocks. * * The global variable "file" determines whether the output * is to a disk-device or to a binary file. */ #define PH_SECTSIZE 512 /* size of a physical disk-sector */ char *derrtab[14] = { "no error", "disk is read-only", "unknown unit", "device not ready", "bad command", "data error", "internal error: bad request structure length", "seek error", "unknown media type", "sector not found", "printer out of paper (?)", "write fault", "read error", "general error" }; #define CACHE_SIZE 20 /* 20 block-buffers */ struct cache { char blockbuf[BLOCK_SIZE]; block_t blocknum; int dirty; int usecnt; } cache[CACHE_SIZE]; void special(string) char *string; { if (string[1] == ':' && string[2] == 0) { /* Format: d: or d:fname */ disk = (string[0] & ~32) - 'A'; if (disk > 1 && !override) /* safety precaution */ pexit("Bad drive specifier for special"); } else { file = 1; if ((fd = creat(string, BWRITE)) == 0) pexit("Can't open special file"); } } void get_block(n, buf) block_t n; char *buf; { /* Get a block to the user */ struct cache *bp, *fp; /* First access returns a zero block */ if (read_and_set(n) == 0) { copy(zero, buf, block_size); return; } /* Look for block in cache */ fp = 0; for (bp = cache; bp < &cache[CACHE_SIZE]; bp++) { if (bp->blocknum == n) { copy(bp, buf, block_size); bp->usecnt++; return; } /* Remember clean block */ if (bp->dirty == 0) if (fp) { if (fp->usecnt > bp->usecnt) fp = bp; } else fp = bp; } /* Block not in cache, get it */ if (!fp) { /* No clean buf, flush one */ for (bp = cache, fp = cache; bp < &cache[CACHE_SIZE]; bp++) if (fp->usecnt > bp->usecnt) fp = bp; mx_write(fp->blocknum, fp); } mx_read(n, fp); fp->dirty = 0; fp->usecnt = 0; fp->blocknum = n; copy(fp, buf, block_size); } void put_block(n, buf) block_t n; char *buf; { /* Accept block from user */ struct cache *fp, *bp; (void) read_and_set(n); /* Look for block in cache */ fp = 0; for (bp = cache; bp < &cache[CACHE_SIZE]; bp++) { if (bp->blocknum == n) { copy(buf, bp, block_size); bp->dirty = 1; return; } /* Remember clean block */ if (bp->dirty == 0) if (fp) { if (fp->usecnt > bp->usecnt) fp = bp; } else fp = bp; } /* Block not in cache */ if (!fp) { /* No clean buf, flush one */ for (bp = cache, fp = cache; bp < &cache[CACHE_SIZE]; bp++) if (fp->usecnt > bp->usecnt) fp = bp; mx_write(fp->blocknum, fp); } fp->dirty = 1; fp->usecnt = 1; fp->blocknum = n; copy(buf, fp, block_size); } void cache_init() { struct cache *bp; for (bp = cache; bp < &cache[CACHE_SIZE]; bp++) bp->blocknum = -1; } void flush() { /* Flush all dirty blocks to disk */ struct cache *bp; for (bp = cache; bp < &cache[CACHE_SIZE]; bp++) if (bp->dirty) { mx_write(bp->blocknum, bp); bp->dirty = 0; } } /*================================================================== * hard read & write etc. *=================================================================*/ #define MAX_RETRIES 5 void mx_read(blocknr, buf) int blocknr; char *buf; { /* Read the requested MINIX-block in core */ char (*bp)[PH_SECTSIZE]; int sectnum, retries, err; if (file) { lseek(fd, (off_t) blocknr * block_size, 0); if (read(fd, buf, block_size) != block_size) pexit("mx_read: error reading file"); } else { sectnum = blocknr * (block_size / PH_SECTSIZE); for (bp = buf; bp < &buf[block_size]; bp++) { retries = MAX_RETRIES; do err = absread(disk, sectnum, bp); while (err && --retries); if (retries) { sectnum++; } else { dexit("mx_read", sectnum, err); } } } } void mx_write(blocknr, buf) int blocknr; char *buf; { /* Write the MINIX-block to disk */ char (*bp)[PH_SECTSIZE]; int retries, sectnum, err; if (file) { lseek(fd, blocknr * block_size, 0); if (write(fd, buf, block_size) != block_size) { pexit("mx_write: error writing file"); } } else { sectnum = blocknr * (block_size / PH_SECTSIZE); for (bp = buf; bp < &buf[block_size]; bp++) { retries = MAX_RETRIES; do { err = abswrite(disk, sectnum, bp); } while (err && --retries); if (retries) { sectnum++; } else { dexit("mx_write", sectnum, err); } } } } void dexit(s, sectnum, err) int sectnum, err; char *s; { printf("Error: %s, sector: %d, code: %d, meaning: %s\n", s, sectnum, err, derrtab[err]); exit(2); } #endif /*================================================================ * get_block & put_block for UNIX *===============================================================*/ #ifdef UNIX void special(string) char *string; { fd = creat(string, 0777); close(fd); fd = open(string, O_RDWR); if (fd < 0) pexit("Can't open special file"); #if (MACHINE == ATARI) { struct stat statbuf; if (fstat(fd, &statbuf) < 0) return; isdev = (statbuf.st_mode & S_IFMT) == S_IFCHR || (statbuf.st_mode & S_IFMT) == S_IFBLK ; } #endif } void get_block(n, buf) block_t n; char *buf; { /* Read a block. */ int k; /* First access returns a zero block */ if (read_and_set(n) == 0) { copy(zero, buf, block_size); return; } lseek(fd, (off_t) n * block_size, SEEK_SET); k = read(fd, buf, block_size); if (k != block_size) { pexit("get_block couldn't read"); } } void get_super_block(buf) char *buf; { /* Read a block. */ int k; if(lseek(fd, (off_t) SUPER_BLOCK_BYTES, SEEK_SET) < 0) { perror("lseek"); pexit("seek failed"); } k = read(fd, buf, STATIC_BLOCK_SIZE); if (k != STATIC_BLOCK_SIZE) { pexit("get_super_block couldn't read"); } } void put_block(n, buf) block_t n; char *buf; { /* Write a block. */ (void) read_and_set(n); /* XXX - check other lseeks too. */ if (lseek(fd, (off_t) n * block_size, SEEK_SET) == (off_t) -1) { pexit("put_block couldn't seek"); } if (write(fd, buf, block_size) != block_size) { pexit("put_block couldn't write"); } } /* Dummy routines to keep source file clean from #ifdefs */ void flush() { return; } void cache_init() { return; } #endif