ext2fs_subr.c revision 1.9.2.3
1 /* $NetBSD: ext2fs_subr.c,v 1.9.2.3 2004/09/21 13:39:07 skrll 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 Manuel Bouyer. 49 * 4. The name of the author may not be used to endorse or promote products 50 * derived from this software without specific prior written permission. 51 * 52 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 53 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 54 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 55 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 56 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 57 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 58 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 59 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 60 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 61 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 62 * 63 * @(#)ffs_subr.c 8.2 (Berkeley) 9/21/93 64 * Modified for ext2fs by Manuel Bouyer. 65 */ 66 67 #include <sys/cdefs.h> 68 __KERNEL_RCSID(0, "$NetBSD: ext2fs_subr.c,v 1.9.2.3 2004/09/21 13:39:07 skrll Exp $"); 69 70 #include <sys/param.h> 71 #include <sys/systm.h> 72 #include <sys/vnode.h> 73 #include <sys/buf.h> 74 #include <sys/inttypes.h> 75 #include <ufs/ufs/inode.h> 76 #include <ufs/ext2fs/ext2fs.h> 77 #include <ufs/ext2fs/ext2fs_extern.h> 78 79 /* 80 * Return buffer with the contents of block "offset" from the beginning of 81 * directory "ip". If "res" is non-zero, fill it in with a pointer to the 82 * remaining space in the directory. 83 */ 84 int 85 ext2fs_blkatoff(v) 86 void *v; 87 { 88 struct vop_blkatoff_args /* { 89 struct vnode *a_vp; 90 off_t a_offset; 91 char **a_res; 92 struct buf **a_bpp; 93 } */ *ap = v; 94 struct inode *ip; 95 struct m_ext2fs *fs; 96 struct buf *bp; 97 daddr_t lbn; 98 int error; 99 100 ip = VTOI(ap->a_vp); 101 fs = ip->i_e2fs; 102 lbn = lblkno(fs, ap->a_offset); 103 104 *ap->a_bpp = NULL; 105 if ((error = bread(ap->a_vp, lbn, fs->e2fs_bsize, NOCRED, &bp)) != 0) { 106 brelse(bp); 107 return (error); 108 } 109 if (ap->a_res) 110 *ap->a_res = (char *)bp->b_data + blkoff(fs, ap->a_offset); 111 *ap->a_bpp = bp; 112 return (0); 113 } 114 115 #ifdef DIAGNOSTIC 116 void 117 ext2fs_checkoverlap(bp, ip) 118 struct buf *bp; 119 struct inode *ip; 120 { 121 #if 0 122 struct buf *ebp, *ep; 123 daddr_t start, last; 124 struct vnode *vp; 125 126 ebp = &buf[nbuf]; 127 start = bp->b_blkno; 128 last = start + btodb(bp->b_bcount) - 1; 129 for (ep = buf; ep < ebp; ep++) { 130 if (ep == bp || (ep->b_flags & B_INVAL) || 131 ep->b_vp == NULLVP) 132 continue; 133 if (VOP_BMAP(ep->b_vp, (daddr_t)0, &vp, (daddr_t)0, NULL)) 134 continue; 135 if (vp != ip->i_devvp) 136 continue; 137 /* look for overlap */ 138 if (ep->b_bcount == 0 || ep->b_blkno > last || 139 ep->b_blkno + btodb(ep->b_bcount) <= start) 140 continue; 141 vprint("Disk overlap", vp); 142 printf("\tstart %" PRId64 ", end %" PRId64 " overlap start " 143 "%" PRId64 ", end %" PRId64 "\n", 144 start, last, ep->b_blkno, 145 ep->b_blkno + btodb(ep->b_bcount) - 1); 146 panic("Disk buffer overlap"); 147 } 148 #else 149 printf("ext2fs_checkoverlap disabled due to buffer cache implementation changes\n"); 150 #endif 151 } 152 #endif 153
Indexes created Fri Oct 03 02:09:57 GMT 2025