Xinu7/src/sys/sys/lfsdfree.c

/* lfsdfree.c - lfsdfree */

#include <conf.h>
#include <kernel.h>
#include <disk.h>
#include <lfile.h>
#include <dir.h>

/*------------------------------------------------------------------------
 *  lfsdfree  --  free a data block given its address
 *------------------------------------------------------------------------
 */
lfsdfree(diskdev, dba)
int	diskdev;
DBADDR	dba;
{
	struct	dir	*dirptr;
	int	dirsem;
	struct	freeblk	*buf;

	dirptr = (struct dir *) dsdirec(diskdev);
	dirsem = ((struct dsblk *)devtab[diskdev].dvioblk)->dflsem;
	buf = (struct freeblk *)getbuf(dskdbp);
	wait(dirsem);
	buf->fbnext = dirptr->d_fblst;
	dirptr->d_fblst = dba;
	write(diskdev, buf, dba);
	write(diskdev, dskbcpy(dirptr), DIRBLK);
	signal(dirsem);
	return(OK);
}