lfdbfree.c

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/* lfdbfree.c - lfdbfree */

#include <xinu.h>

/*------------------------------------------------------------------------
 *  lfdbfree  -  Free a data block given its block number (assumes
 *          directory mutex is held)
 *------------------------------------------------------------------------
 */
status  lfdbfree(
      did32     diskdev,    /* ID of disk device to use */
      dbid32    dnum        /* ID of data block to free */
    )
{
    struct  lfdir   *dirptr;    /* Pointer to directory     */
    struct  lfdbfree buf;       /* Buffer to hold data block    */

    dirptr = &Lf_data.lf_dir;
    buf.lf_nextdb = dirptr->lfd_dfree;
    dirptr->lfd_dfree = dnum;
    write(diskdev, (char *)&buf,   dnum);
    write(diskdev, (char *)dirptr, LF_AREA_DIR);

    return OK;
}