usr/src/sys/ufs/lfs/lfs_bio.c

/*
 * Copyright (c) 1991 Regents of the University of California.
 * All rights reserved.
 *
 * %sccs.include.redist.c%
 *
 *      @(#)lfs_bio.c   7.3 (Berkeley) %G%
 */

#include <sys/param.h>
#include <sys/proc.h>
#include <sys/buf.h>
#include <sys/resourcevar.h>

#include <ufs/lfs/lfs.h>
#include <ufs/lfs/lfs_extern.h>

int
lfs_bwrite(bp)
        register BUF *bp;
{
#ifdef VERBOSE
printf("lfs_bwrite\n");
#endif
        /*
         * LFS version of bawrite, bdwrite, bwrite.  Set the delayed write
         * flag and use reassignbuf to move the buffer from the clean list
         * to the dirty one, then unlock the buffer.  Note, we set the
         * B_LOCKED flag, which causes brelse to move the buffer onto the
         * LOCKED free list.  This is necessary, otherwise getnewbuf() would
         * try to reclaim them using bawrite, which isn't going to work.
         *
         * XXX
         * No accounting for the cost of the write is currently done.
         * This is almost certainly wrong for synchronous operations, i.e. NFS.
         */
        bp->b_flags |= B_DELWRI | B_LOCKED;
        bp->b_flags &= ~(B_READ | B_DONE | B_ERROR);
        reassignbuf(bp, bp->b_vp);
        brelse(bp);
        return (0);
}