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Annotation of researchv8dc/cmd/mkbitfs.c, revision 1.1

1.1     ! root        1: #include "stdio.h"
        !             2: #include "sys/param.h"
        !             3: #include "sys/stat.h"
        !             4: #include "sys/filsys.h"
        !             5: #include "sys/dir.h"
        !             6: #include "sys/ino.h"
        !             7: #include "sys/inode.h"
        !             8: 
        !             9: #define ICOUNT BUFSIZE/sizeof(struct dinode)
        !            10: struct filsys sb;
        !            11: struct dinode ib[ICOUNT];
        !            12: struct direct db[BUFSIZE/sizeof(struct direct)];
        !            13: struct stat statbuf;
        !            14: char buf[BUFSIZE];
        !            15: long where[NADDR];
        !            16: 
        !            17: main(argc, argv)
        !            18: char **argv;
        !            19: {
        !            20:        register int i, j;
        !            21:        daddr_t size, isize;
        !            22:        register daddr_t bno, bfree;
        !            23:        int fd;
        !            24:        long atol();
        !            25:        off_t lseek();
        !            26: 
        !            27:        if(argc != 3) {
        !            28:                fprintf(stderr, "%s: bit-dev no-of-4k-blocks\n", argv[0]);
        !            29:                exit(1);
        !            30:        }
        !            31:        fd = open(argv[1], 2);
        !            32:        if(fd < 0) {
        !            33:                perror(argv[1]);
        !            34:                exit(1);
        !            35:        }
        !            36:        if(fstat(fd, &statbuf) < 0) {
        !            37:                perror(argv[1]);
        !            38:                exit(1);
        !            39:        }
        !            40:        if(!BITFS(statbuf.st_rdev)) {
        !            41:                fprintf(stderr, "%s device %d, 0%o can't have a 4k system\n",
        !            42:                        argv[1], major(statbuf.st_rdev), minor(statbuf.st_rdev));
        !            43:                exit(1);
        !            44:        }
        !            45:        size = atoi(argv[2]);
        !            46:        if(size <= 3) {
        !            47:                fprintf(stderr, "size %ld too small\n", size);
        !            48:                exit(1);
        !            49:        }
        !            50:        if((i = lseek(fd, (size -1) * BUFSIZE, 0)) < 0 ||
        !            51:                (j = read(fd, buf, BUFSIZE)) != BUFSIZE) {
        !            52:                fprintf(stderr, "size %ld too large (lseek %d, read %d)\n", size,
        !            53:                        i, j);
        !            54:                exit(1);
        !            55:        }
        !            56:        isize = (size - 2)/(1 + ICOUNT);        /* DOUBTFUL */
        !            57:        if(isize * ICOUNT > 65536)
        !            58:                isize = 65536/ICOUNT;   /* 65535 is largest short */
        !            59:        fprintf(stderr, "%ld 4k blocks, %ld blocks of inodes, %d inodes\n",
        !            60:                size, isize - 2, ICOUNT * (isize - 2));
        !            61:        for(bno = 2; bno < isize; bno++) {      /* zero out all inodes */
        !            62:                lseek(fd, (off_t)(bno * BUFSIZE), 0);
        !            63:                if (write(fd, (char *)ib, BUFSIZE) != BUFSIZE) {
        !            64:                        perror("inode write");
        !            65:                        exit(1);
        !            66:                }
        !            67:        }
        !            68:        where[0] = isize;
        !            69:        /* next block has the root directory */
        !            70:        db[0].d_ino = ROOTINO;
        !            71:        db[0].d_name[0] = '.';
        !            72:        db[1].d_ino = ROOTINO;
        !            73:        db[1].d_name[1] = db[1].d_name[0] = '.';
        !            74:        if (write(fd, (char *)db, BUFSIZE) != BUFSIZE) {
        !            75:                perror("root dir write");
        !            76:                exit(1);
        !            77:        }
        !            78:        /* now for its inode */
        !            79:        ib[ROOTINO-1].di_mode = IFDIR | IREAD | IWRITE | IEXEC;
        !            80:        ib[ROOTINO-1].di_mode |= (IREAD | IEXEC | IWRITE) >> 3;
        !            81:        ib[ROOTINO-1].di_mode |= (IREAD | IEXEC | IWRITE) >> 6;
        !            82:        ib[ROOTINO-1].di_nlink = 2;
        !            83:        ib[ROOTINO-1].di_uid = ib[ROOTINO-1].di_gid = 0;
        !            84:        ib[ROOTINO-1].di_size = 2*sizeof(struct direct);
        !            85:        ltol3(ib[ROOTINO-1].di_addr, where, 1);
        !            86:        ib[ROOTINO-1].di_atime = ib[ROOTINO-1].di_mtime =
        !            87:                ib[ROOTINO-1].di_ctime = time(0);
        !            88:        lseek(fd, (off_t)(2*BUFSIZE), 0);
        !            89:        if (write(fd, (char *)ib, BUFSIZE) != BUFSIZE) {
        !            90:                perror("root inode write");
        !            91:                exit(1);
        !            92:        }
        !            93:        /* and now the super block */
        !            94:        sb.s_isize = isize;
        !            95:        sb.s_fsize = size;
        !            96:        sb.s_time = ib[ROOTINO-1].di_atime;
        !            97:        sb.s_tfree = size - isize - 1;
        !            98:        sb.s_tinode = (isize - 2) * ICOUNT - 1;
        !            99:        sb.s_valid = 1;
        !           100:        for(i = 0; i < BITMAP; i++)
        !           101:                sb.s_bfree[i] = 0;
        !           102:        for(bno = isize + 1; bno < size; bno++) {
        !           103:                bfree = bno - isize;
        !           104:                sb.s_bfree[bfree>>5] |= (1 << (bfree & 31));
        !           105:        }
        !           106:        if((++bfree >> 5) >= BITMAP) {
        !           107:                fprintf(stderr, "free map won't fit, blk = %ld, wd = %ld\n",
        !           108:                        bno, bfree);
        !           109:                exit(1);
        !           110:        }
        !           111:        lseek(fd, (off_t)BUFSIZE, 0);
        !           112:        if (write(fd, (char *)&sb, BUFSIZE) != BUFSIZE) {
        !           113:                perror("superblock write");
        !           114:                exit(1);
        !           115:        }
        !           116:        exit(0);
        !           117: }

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