- start = bp->b_blkno;
- last = start + (size / DEV_BSIZE) - 1;
- dp = BUFHASH(bp->b_dev, bp->b_blkno);
-loop:
- for (ep = dp->b_forw; ep != dp; ep = ep->b_forw) {
- if (ep == bp || ep->b_dev != bp->b_dev || (ep->b_flags&B_INVAL))
- continue;
- /* look for overlap */
- if (ep->b_bcount == 0 || ep->b_blkno > last ||
- ep->b_blkno + (ep->b_bcount / DEV_BSIZE) <= start)
- continue;
-if (bioprintfs)
-if (ep->b_flags&B_BUSY)
-printf("sleeping on:dev 0x%x, blks %d-%d, flg 0%o allocing dev 0x%x, blks %d-%d, flg 0%o\n",
-ep->b_dev, ep->b_blkno, ep->b_blkno + (ep->b_bcount / DEV_BSIZE) - 1,
-ep->b_flags, bp->b_dev, start, last, bp->b_flags);
- s = spl6();
- if (ep->b_flags&B_BUSY) {
- ep->b_flags |= B_WANTED;
- sleep((caddr_t)ep, PRIBIO+1);
- (void) splx(s);
- goto loop;
- }
- (void) splx(s);
- notavail(ep);
- if (ep->b_flags & B_DELWRI) {
-if (bioprintfs)
-printf("DELWRI:dev 0x%x, blks %d-%d, flg 0%o allocing dev 0x%x, blks %d-%d, flg 0%o\n",
-ep->b_dev, ep->b_blkno, ep->b_blkno + (ep->b_bcount / DEV_BSIZE) - 1,
-ep->b_flags, bp->b_dev, start, last, bp->b_flags);
- bwrite(ep);
- goto loop;
- }
+ if (sizealloc < tp->b_bufsize) {
+ ep = bfreelist[BQ_EMPTY].av_forw;
+ if (ep == &bfreelist[BQ_EMPTY])
+ goto out;
+ s = splbio();
+ bremfree(ep);
+ ep->b_flags |= B_BUSY;
+ splx(s);
+ pagemove(tp->b_un.b_addr + sizealloc, ep->b_un.b_addr,
+ (int)tp->b_bufsize - sizealloc);
+ ep->b_bufsize = tp->b_bufsize - sizealloc;
+ tp->b_bufsize = sizealloc;