1 /* $OpenBSD: ext2fs_subr.c,v 1.27 2011/07/04 20:35:35 deraadt 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/mount.h> 41 #include <sys/buf.h> 42 #include <sys/specdev.h> 43 44 #include <ufs/ufs/quota.h> 45 #include <ufs/ufs/inode.h> 46 #include <ufs/ufs/ufsmount.h> 47 48 #include <ufs/ext2fs/ext2fs.h> 49 #include <ufs/ext2fs/ext2fs_extern.h> 50 51 #include <miscfs/fifofs/fifo.h> 52 53 union _qcvt { 54 int64_t qcvt; 55 int32_t val[2]; 56 }; 57 58 #define SETHIGH(q, h) { \ 59 union _qcvt tmp; \ 60 tmp.qcvt = (q); \ 61 tmp.val[_QUAD_HIGHWORD] = (h); \ 62 (q) = tmp.qcvt; \ 63 } 64 65 #define SETLOW(q, l) { \ 66 union _qcvt tmp; \ 67 tmp.qcvt = (q); \ 68 tmp.val[_QUAD_LOWWORD] = (l); \ 69 (q) = tmp.qcvt; \ 70 } 71 72 #ifdef _KERNEL 73 74 /* 75 * Return buffer with the contents of block "offset" from the beginning of 76 * directory "ip". If "res" is non-zero, fill it in with a pointer to the 77 * remaining space in the directory. 78 */ 79 int 80 ext2fs_bufatoff(struct inode *ip, off_t offset, char **res, struct buf **bpp) 81 { 82 struct vnode *vp; 83 struct m_ext2fs *fs; 84 struct buf *bp; 85 int32_t lbn; 86 int error; 87 88 vp = ITOV(ip); 89 fs = ip->i_e2fs; 90 lbn = lblkno(fs, offset); 91 92 *bpp = NULL; 93 if ((error = bread(vp, lbn, fs->e2fs_bsize, &bp)) != 0) { 94 brelse(bp); 95 return (error); 96 } 97 if (res) 98 *res = (char *)bp->b_data + blkoff(fs, offset); 99 *bpp = bp; 100 return (0); 101 } 102 #endif 103 104 #if defined(_KERNEL) && defined(DIAGNOSTIC) 105 void 106 ext2fs_checkoverlap(struct buf *bp, struct inode *ip) 107 { 108 struct buf *ep; 109 struct vnode *vp; 110 daddr64_t start, last; 111 112 start = bp->b_blkno; 113 last = start + btodb(bp->b_bcount) - 1; 114 LIST_FOREACH(ep, &bufhead, b_list) { 115 if (ep == bp || (ep->b_flags & B_INVAL) || 116 ep->b_vp == NULLVP) 117 continue; 118 if (VOP_BMAP(ep->b_vp, (daddr64_t)0, &vp, NULL, NULL)) 119 continue; 120 if (vp != ip->i_devvp) 121 continue; 122 /* look for overlap */ 123 if (ep->b_bcount == 0 || ep->b_blkno > last || 124 ep->b_blkno + btodb(ep->b_bcount) <= start) 125 continue; 126 vprint("Disk overlap", vp); 127 printf("\tstart %lld, end %lld overlap start %lld, end %lld\n", 128 start, last, ep->b_blkno, 129 ep->b_blkno + btodb(ep->b_bcount) - 1); 130 panic("Disk buffer overlap"); 131 } 132 } 133 #endif /* DIAGNOSTIC */ 134 135 /* 136 * Initialize the vnode associated with a new inode, handle aliased vnodes. 137 */ 138 int 139 ext2fs_vinit(struct mount *mp, struct vops *specops, 140 struct vops *fifoops, struct vnode **vpp) 141 { 142 struct inode *ip; 143 struct vnode *vp, *nvp; 144 struct timeval tv; 145 146 vp = *vpp; 147 ip = VTOI(vp); 148 vp->v_type = IFTOVT(ip->i_e2fs_mode); 149 150 switch(vp->v_type) { 151 case VCHR: 152 case VBLK: 153 vp->v_op = specops; 154 155 nvp = checkalias(vp, fs2h32(ip->i_e2din->e2di_rdev), mp); 156 if (nvp != NULL) { 157 /* 158 * Discard unneeded vnode, but save its inode. Note 159 * that the lock is carried over in the inode to the 160 * replacement vnode. 161 */ 162 nvp->v_data = vp->v_data; 163 vp->v_data = NULL; 164 vp->v_op = &spec_vops; 165 #ifdef VFSLCKDEBUG 166 vp->v_flag &= ~VLOCKSWORK; 167 #endif 168 vrele(vp); 169 vgone(vp); 170 /* Reinitialize aliased vnode. */ 171 vp = nvp; 172 ip->i_vnode = vp; 173 } 174 175 break; 176 177 case VFIFO: 178 #ifdef FIFO 179 vp->v_op = fifoops; 180 break; 181 #else 182 return (EOPNOTSUPP); 183 #endif /* FIFO */ 184 185 default: 186 187 break; 188 } 189 190 if (ip->i_number == EXT2_ROOTINO) 191 vp->v_flag |= VROOT; 192 193 /* Initialize modrev times */ 194 getmicrouptime(&tv); 195 SETHIGH(ip->i_modrev, tv.tv_sec); 196 SETLOW(ip->i_modrev, tv.tv_usec * 4294); 197 198 *vpp = vp; 199 200 return (0); 201 } 202