minix/lib/libminlib/fslib.c
Ben Gras 6c8f7fc3ba netbsd dirent.h, import sys/sys *.h, mfs cleanup
. add all sys/sys headers not already present to help compiling
	. take netbsd dirent.h and struct dirent; main result is
	  introducing d_type and d_namlen that have to be set by getdents()
	  in all FS code implementing it
	. d_off is gone
	. alignment of the struct has become 8 bytes instead of 4
	. remove _MAX_BLOCK_SIZE, _MIN_BLOCK_SIZE, _STATIC_BLOCK_SIZE
	. libminlib: cleanup unused yet duplicate code
	. mfs: throw out the long-broken v1, v2 support
	. new test for dirent contents filled by getdents()

Change-Id: I1459755c7ba5e5d1c9396d3a587ce6e63ddc283e
2014-03-01 09:04:59 +01:00

58 lines
1.8 KiB
C

/* fslib.c - routines needed by fs and fs utilities */
#include <minix/config.h> /* for unused stuff in <minix/type.h> :-( */
#include <limits.h>
#include <dirent.h>
#include <sys/types.h>
#include <minix/const.h>
#include <minix/type.h> /* for unshort :-( */
#include <minix/sysutil.h>
#include "mfs/const.h" /* depends of -I flag in Makefile */
#include "mfs/type.h" /* ditto */
#include "mfs/inode.h" /* ditto */
#include "mfs/super.h"
#include <minix/fslib.h>
#include <sys/stat.h>
/* The next routine is copied from fsck.c and mkfs.c... (Re)define some
* things for consistency. Some things should be done better.
*/
/* Convert from bit count to a block count. The usual expression
*
* (nr_bits + (1 << BITMAPSHIFT) - 1) >> BITMAPSHIFT
*
* doesn't work because of overflow.
*
* Other overflow bugs, such as the expression for N_ILIST overflowing when
* s_inodes is just over V*_INODES_PER_BLOCK less than the maximum+1, are not
* fixed yet, because that number of inodes is silly.
*/
/* The above comment doesn't all apply now bit_t is long. Overflow is now
* unlikely, but negative bit counts are now possible (though unlikely)
* and give silly results.
*/
int bitmapsize(nr_bits, block_size)
bit_t nr_bits;
int block_size;
{
int nr_blocks;
nr_blocks = (int) (nr_bits / FS_BITS_PER_BLOCK(block_size));
if (((bit_t) nr_blocks * FS_BITS_PER_BLOCK(block_size)) < nr_bits) ++nr_blocks;
return(nr_blocks);
}
uint8_t fs_mode_to_type(mode_t mode)
{
if(S_ISREG(mode)) return DT_REG;
else if(S_ISDIR(mode)) return DT_DIR;
else if(S_ISLNK(mode)) return DT_LNK;
else if(S_ISCHR(mode)) return DT_CHR;
else if(S_ISBLK(mode)) return DT_BLK;
else if(S_ISFIFO(mode)) return DT_FIFO;
else if(S_ISSOCK(mode)) return DT_SOCK;
panic("unknown type, mode 0x%x", mode);
}