1 /* 2 * Copyright (c) 1991 Regents of the University of California. 3 * All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 * 7 * @(#)lfs_subr.c 7.11 (Berkeley) 05/15/92 8 */ 9 10 #include <sys/param.h> 11 #include <sys/namei.h> 12 #include <sys/vnode.h> 13 #include <sys/buf.h> 14 15 #include <ufs/ufs/quota.h> 16 #include <ufs/ufs/inode.h> 17 18 #include <ufs/lfs/lfs.h> 19 #include <ufs/lfs/lfs_extern.h> 20 21 /* 22 * Return buffer with the contents of block "offset" from the beginning of 23 * directory "ip". If "res" is non-zero, fill it in with a pointer to the 24 * remaining space in the directory. 25 */ 26 int 27 lfs_blkatoff (ap) 28 struct vop_blkatoff_args *ap; 29 { 30 register struct lfs *fs; 31 struct inode *ip; 32 struct buf *bp; 33 daddr_t lbn; 34 int bsize, error; 35 36 ip = VTOI(ap->a_vp); 37 fs = ip->i_lfs; 38 lbn = lblkno(fs, ap->a_offset); 39 bsize = blksize(fs); 40 41 *ap->a_bpp = NULL; 42 if (error = bread(ap->a_vp, lbn, bsize, NOCRED, &bp)) { 43 brelse(bp); 44 return (error); 45 } 46 if (ap->a_res) 47 *ap->a_res = bp->b_un.b_addr + blkoff(fs, ap->a_offset); 48 *ap->a_bpp = bp; 49 return (0); 50 } 51