ext2fs_subr.c revision 1.10
1 /* $NetBSD: ext2fs_subr.c,v 1.10 2003/08/07 16:34:27 agc Exp $ */ 2 3 /* 4 * Copyright (c) 1982, 1986, 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * @(#)ffs_subr.c 8.2 (Berkeley) 9/21/93 32 * Modified for ext2fs by Manuel Bouyer. 33 */ 34 35 /* 36 * Copyright (c) 1997 Manuel Bouyer. 37 * 38 * Redistribution and use in source and binary forms, with or without 39 * modification, are permitted provided that the following conditions 40 * are met: 41 * 1. Redistributions of source code must retain the above copyright 42 * notice, this list of conditions and the following disclaimer. 43 * 2. Redistributions in binary form must reproduce the above copyright 44 * notice, this list of conditions and the following disclaimer in the 45 * documentation and/or other materials provided with the distribution. 46 * 3. All advertising materials mentioning features or use of this software 47 * must display the following acknowledgement: 48 * This product includes software developed by the University of 49 * California, Berkeley and its contributors. 50 * 4. Neither the name of the University nor the names of its contributors 51 * may be used to endorse or promote products derived from this software 52 * without specific prior written permission. 53 * 54 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 55 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 56 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 57 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 58 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 59 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 60 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 61 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 62 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 63 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 64 * SUCH DAMAGE. 65 * 66 * @(#)ffs_subr.c 8.2 (Berkeley) 9/21/93 67 * Modified for ext2fs by Manuel Bouyer. 68 */ 69 70 #include <sys/cdefs.h> 71 __KERNEL_RCSID(0, "$NetBSD: ext2fs_subr.c,v 1.10 2003/08/07 16:34:27 agc Exp $"); 72 73 #include <sys/param.h> 74 #include <sys/systm.h> 75 #include <sys/vnode.h> 76 #include <sys/buf.h> 77 #include <sys/inttypes.h> 78 #include <ufs/ufs/inode.h> 79 #include <ufs/ext2fs/ext2fs.h> 80 #include <ufs/ext2fs/ext2fs_extern.h> 81 82 /* 83 * Return buffer with the contents of block "offset" from the beginning of 84 * directory "ip". If "res" is non-zero, fill it in with a pointer to the 85 * remaining space in the directory. 86 */ 87 int 88 ext2fs_blkatoff(v) 89 void *v; 90 { 91 struct vop_blkatoff_args /* { 92 struct vnode *a_vp; 93 off_t a_offset; 94 char **a_res; 95 struct buf **a_bpp; 96 } */ *ap = v; 97 struct inode *ip; 98 struct m_ext2fs *fs; 99 struct buf *bp; 100 daddr_t lbn; 101 int error; 102 103 ip = VTOI(ap->a_vp); 104 fs = ip->i_e2fs; 105 lbn = lblkno(fs, ap->a_offset); 106 107 *ap->a_bpp = NULL; 108 if ((error = bread(ap->a_vp, lbn, fs->e2fs_bsize, NOCRED, &bp)) != 0) { 109 brelse(bp); 110 return (error); 111 } 112 if (ap->a_res) 113 *ap->a_res = (char *)bp->b_data + blkoff(fs, ap->a_offset); 114 *ap->a_bpp = bp; 115 return (0); 116 } 117 118 #ifdef DIAGNOSTIC 119 void 120 ext2fs_checkoverlap(bp, ip) 121 struct buf *bp; 122 struct inode *ip; 123 { 124 struct buf *ebp, *ep; 125 daddr_t start, last; 126 struct vnode *vp; 127 128 ebp = &buf[nbuf]; 129 start = bp->b_blkno; 130 last = start + btodb(bp->b_bcount) - 1; 131 for (ep = buf; ep < ebp; ep++) { 132 if (ep == bp || (ep->b_flags & B_INVAL) || 133 ep->b_vp == NULLVP) 134 continue; 135 if (VOP_BMAP(ep->b_vp, (daddr_t)0, &vp, (daddr_t)0, NULL)) 136 continue; 137 if (vp != ip->i_devvp) 138 continue; 139 /* look for overlap */ 140 if (ep->b_bcount == 0 || ep->b_blkno > last || 141 ep->b_blkno + btodb(ep->b_bcount) <= start) 142 continue; 143 vprint("Disk overlap", vp); 144 printf("\tstart %" PRId64 ", end %" PRId64 " overlap start " 145 "%" PRId64 ", end %" PRId64 "\n", 146 start, last, ep->b_blkno, 147 ep->b_blkno + btodb(ep->b_bcount) - 1); 148 panic("Disk buffer overlap"); 149 } 150 } 151 #endif 152
Indexes created Wed Sep 24 05:09:52 GMT 2025