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 7.9 (Berkeley) 03/04/92 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(vp, offset, res, bpp) 28 struct vnode *vp; 29 off_t offset; 30 char **res; 31 struct buf **bpp; 32 { 33 register struct lfs *fs; 34 struct inode *ip; 35 struct buf *bp; 36 daddr_t lbn; 37 int bsize, error; 38 39 ip = VTOI(vp); 40 fs = ip->i_lfs; 41 lbn = lblkno(fs, offset); 42 bsize = blksize(fs); 43 44 *bpp = NULL; 45 if (error = bread(vp, lbn, bsize, NOCRED, &bp)) { 46 brelse(bp); 47 return (error); 48 } 49 if (res) 50 *res = bp->b_un.b_addr + blkoff(fs, offset); 51 *bpp = bp; 52 return (0); 53 } 54