1 /* $OpenBSD: ext2fs_subr.c,v 1.37 2021/10/20 06:35:39 semarie 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 #include <ufs/ext2fs/ext2fs_extents.h> 51 52 #ifdef _KERNEL 53 54 /* 55 * Return buffer with the contents of block "offset" from the beginning of 56 * directory "ip". If "res" is non-zero, fill it in with a pointer to the 57 * remaining space in the directory. 58 */ 59 int 60 ext2fs_bufatoff(struct inode *ip, off_t offset, char **res, struct buf **bpp) 61 { 62 struct vnode *vp; 63 struct m_ext2fs *fs; 64 struct buf *bp; 65 daddr_t lbn, pos; 66 int error; 67 68 vp = ITOV(ip); 69 fs = ip->i_e2fs; 70 lbn = lblkno(fs, offset); 71 72 if (ip->i_e2din->e2di_flags & EXT4_EXTENTS) { 73 struct ext4_extent_path path; 74 struct ext4_extent *ep; 75 76 memset(&path, 0, sizeof path); 77 if (ext4_ext_find_extent(fs, ip, lbn, &path) == NULL || 78 (ep = path.ep_ext) == NULL) 79 goto normal; 80 81 if (path.ep_bp != NULL) { 82 brelse(path.ep_bp); 83 path.ep_bp = NULL; 84 } 85 pos = lbn - ep->e_blk + (((daddr_t)ep->e_start_hi << 32) | ep->e_start_lo); 86 error = bread(ip->i_devvp, fsbtodb(fs, pos), fs->e2fs_bsize, &bp); 87 if (error) { 88 brelse(bp); 89 return (error); 90 } 91 92 if (res) 93 *res = (char *)bp->b_data + blkoff(fs, offset); 94 95 *bpp = bp; 96 97 return (0); 98 } 99 100 normal: 101 *bpp = NULL; 102 if ((error = bread(vp, lbn, fs->e2fs_bsize, &bp)) != 0) { 103 brelse(bp); 104 return (error); 105 } 106 if (res) 107 *res = (char *)bp->b_data + blkoff(fs, offset); 108 *bpp = bp; 109 return (0); 110 } 111 #endif 112 113 #if defined(_KERNEL) && defined(DIAGNOSTIC) 114 void 115 ext2fs_checkoverlap(struct buf *bp, struct inode *ip) 116 { 117 struct buf *ep; 118 struct vnode *vp; 119 daddr_t start, last; 120 121 start = bp->b_blkno; 122 last = start + btodb(bp->b_bcount) - 1; 123 LIST_FOREACH(ep, &bufhead, b_list) { 124 if (ep == bp || (ep->b_flags & B_INVAL) || 125 ep->b_vp == NULLVP) 126 continue; 127 if (VOP_BMAP(ep->b_vp, 0, &vp, NULL, NULL)) 128 continue; 129 if (vp != ip->i_devvp) 130 continue; 131 /* look for overlap */ 132 if (ep->b_bcount == 0 || ep->b_blkno > last || 133 ep->b_blkno + btodb(ep->b_bcount) <= start) 134 continue; 135 vprint("Disk overlap", vp); 136 printf("\tstart %lld, end %lld overlap start %lld, end %lld\n", 137 start, last, (long long)ep->b_blkno, 138 (long long)(ep->b_blkno + btodb(ep->b_bcount) - 1)); 139 panic("Disk buffer overlap"); 140 } 141 } 142 #endif /* DIAGNOSTIC */ 143 144 /* 145 * Initialize the vnode associated with a new inode, handle aliased vnodes. 146 */ 147 int 148 ext2fs_vinit(struct mount *mp, struct vnode **vpp) 149 { 150 struct inode *ip; 151 struct vnode *vp, *nvp; 152 struct timeval tv; 153 154 vp = *vpp; 155 ip = VTOI(vp); 156 vp->v_type = IFTOVT(ip->i_e2fs_mode); 157 158 switch(vp->v_type) { 159 case VCHR: 160 case VBLK: 161 vp->v_op = &ext2fs_specvops; 162 163 nvp = checkalias(vp, letoh32(ip->i_e2din->e2di_rdev), mp); 164 if (nvp != NULL) { 165 /* 166 * Discard unneeded vnode, but save its inode. Note 167 * that the lock is carried over in the inode to the 168 * replacement vnode. 169 */ 170 nvp->v_data = vp->v_data; 171 vp->v_data = NULL; 172 vp->v_op = &spec_vops; 173 #ifdef VFSLCKDEBUG 174 vp->v_flag &= ~VLOCKSWORK; 175 #endif 176 vrele(vp); 177 vgone(vp); 178 /* Reinitialize aliased vnode. */ 179 vp = nvp; 180 ip->i_vnode = vp; 181 } 182 183 break; 184 185 case VFIFO: 186 #ifdef FIFO 187 vp->v_op = &ext2fs_fifovops; 188 break; 189 #else 190 return (EOPNOTSUPP); 191 #endif /* FIFO */ 192 193 default: 194 195 break; 196 } 197 198 if (ip->i_number == EXT2_ROOTINO) 199 vp->v_flag |= VROOT; 200 201 /* Initialize modrev times */ 202 getmicrouptime(&tv); 203 ip->i_modrev = (u_quad_t)tv.tv_sec << 32; 204 ip->i_modrev |= (u_quad_t)tv.tv_usec * 4294; 205 206 *vpp = vp; 207 208 return (0); 209 } 210