1 /* fslib.c - routines needed by fs and fs utilities */ 2 3 #include <minix/config.h> /* for unused stuff in <minix/type.h> :-( */ 4 #include <limits.h> 5 #include <dirent.h> 6 #include <assert.h> 7 #include <stdlib.h> /* for abort() */ 8 #include <sys/types.h> 9 #include <minix/const.h> 10 #include <minix/type.h> /* for unshort :-( */ 11 #include <minix/sysutil.h> 12 #include <minix/minlib.h> 13 #include "mfs/const.h" /* depends of -I flag in Makefile */ 14 #include "mfs/type.h" /* ditto */ 15 #include "mfs/inode.h" /* ditto */ 16 #include "mfs/super.h" 17 #include <minix/fslib.h> 18 #include <sys/stat.h> 19 20 /* The next routine is copied from fsck.c and mkfs.c... (Re)define some 21 * things for consistency. Some things should be done better. 22 */ 23 24 /* Convert from bit count to a block count. The usual expression 25 * 26 * (nr_bits + (1 << BITMAPSHIFT) - 1) >> BITMAPSHIFT 27 * 28 * doesn't work because of overflow. 29 * 30 * Other overflow bugs, such as the expression for N_ILIST overflowing when 31 * s_inodes is just over V*_INODES_PER_BLOCK less than the maximum+1, are not 32 * fixed yet, because that number of inodes is silly. 33 */ 34 /* The above comment doesn't all apply now bit_t is long. Overflow is now 35 * unlikely, but negative bit counts are now possible (though unlikely) 36 * and give silly results. 37 */ 38 int bitmapsize(nr_bits, block_size) 39 bit_t nr_bits; 40 int block_size; 41 { 42 int nr_blocks; 43 44 nr_blocks = (int) (nr_bits / FS_BITS_PER_BLOCK(block_size)); 45 if (((bit_t) nr_blocks * FS_BITS_PER_BLOCK(block_size)) < nr_bits) ++nr_blocks; 46 return(nr_blocks); 47 } 48 49 uint8_t fs_mode_to_type(mode_t mode) 50 { 51 if(S_ISREG(mode)) return DT_REG; 52 else if(S_ISDIR(mode)) return DT_DIR; 53 else if(S_ISLNK(mode)) return DT_LNK; 54 else if(S_ISCHR(mode)) return DT_CHR; 55 else if(S_ISBLK(mode)) return DT_BLK; 56 else if(S_ISFIFO(mode)) return DT_FIFO; 57 else if(S_ISSOCK(mode)) return DT_SOCK; 58 59 assert(0 && "unknown type"); 60 61 /* assert()s are removed on NDEBUG builds. */ 62 abort(); 63 } 64 65