1 /* $OpenBSD: ext2fs_subr.c,v 1.10 2003/06/02 23:28:22 millert Exp $ */ 2 /* $NetBSD: ext2fs_subr.c,v 1.1 1997/06/11 09:34:03 bouyer Exp $ */ 3 4 /* 5 * Copyright (c) 1997 Manuel Bouyer. 6 * Copyright (c) 1982, 1986, 1989, 1993 7 * The Regents of the University of California. All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)ffs_subr.c 8.2 (Berkeley) 9/21/93 34 * Modified for ext2fs by Manuel Bouyer. 35 */ 36 37 #include <sys/param.h> 38 #include <sys/systm.h> 39 #include <sys/vnode.h> 40 #include <sys/buf.h> 41 #include <ufs/ufs/quota.h> 42 #include <ufs/ufs/inode.h> 43 #include <ufs/ext2fs/ext2fs.h> 44 #include <ufs/ext2fs/ext2fs_extern.h> 45 46 #ifdef _KERNEL 47 48 /* 49 * Return buffer with the contents of block "offset" from the beginning of 50 * directory "ip". If "res" is non-zero, fill it in with a pointer to the 51 * remaining space in the directory. 52 */ 53 int 54 ext2fs_bufatoff(struct inode *ip, off_t offset, char **res, struct buf **bpp) 55 { 56 struct vnode *vp; 57 struct m_ext2fs *fs; 58 struct buf *bp; 59 ufs1_daddr_t lbn; 60 int error; 61 62 vp = ITOV(ip); 63 fs = ip->i_e2fs; 64 lbn = lblkno(fs, offset); 65 66 *bpp = NULL; 67 if ((error = bread(vp, lbn, fs->e2fs_bsize, NOCRED, &bp)) != 0) { 68 brelse(bp); 69 return (error); 70 } 71 if (res) 72 *res = (char *)bp->b_data + blkoff(fs, offset); 73 *bpp = bp; 74 return (0); 75 } 76 #endif 77 78 #if defined(_KERNEL) && defined(DIAGNOSTIC) 79 void 80 ext2fs_checkoverlap(bp, ip) 81 struct buf *bp; 82 struct inode *ip; 83 { 84 struct buf *ebp, *ep; 85 ufs1_daddr_t start, last; 86 struct vnode *vp; 87 88 ebp = &buf[nbuf]; 89 start = bp->b_blkno; 90 last = start + btodb(bp->b_bcount) - 1; 91 for (ep = buf; ep < ebp; ep++) { 92 if (ep == bp || (ep->b_flags & B_INVAL) || 93 ep->b_vp == NULLVP) 94 continue; 95 if (VOP_BMAP(ep->b_vp, (daddr_t)0, &vp, (daddr_t)0, NULL)) 96 continue; 97 if (vp != ip->i_devvp) 98 continue; 99 /* look for overlap */ 100 if (ep->b_bcount == 0 || ep->b_blkno > last || 101 ep->b_blkno + btodb(ep->b_bcount) <= start) 102 continue; 103 vprint("Disk overlap", vp); 104 printf("\tstart %d, end %d overlap start %d, end %ld\n", 105 start, last, ep->b_blkno, 106 ep->b_blkno + btodb(ep->b_bcount) - 1); 107 panic("Disk buffer overlap"); 108 } 109 } 110 #endif /* DIAGNOSTIC */ 111