1 /* $OpenBSD: ext2fs_subr.c,v 1.38 2024/10/08 02:58:26 jsg 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 /* 114 * Initialize the vnode associated with a new inode, handle aliased vnodes. 115 */ 116 int 117 ext2fs_vinit(struct mount *mp, struct vnode **vpp) 118 { 119 struct inode *ip; 120 struct vnode *vp, *nvp; 121 struct timeval tv; 122 123 vp = *vpp; 124 ip = VTOI(vp); 125 vp->v_type = IFTOVT(ip->i_e2fs_mode); 126 127 switch(vp->v_type) { 128 case VCHR: 129 case VBLK: 130 vp->v_op = &ext2fs_specvops; 131 132 nvp = checkalias(vp, letoh32(ip->i_e2din->e2di_rdev), mp); 133 if (nvp != NULL) { 134 /* 135 * Discard unneeded vnode, but save its inode. Note 136 * that the lock is carried over in the inode to the 137 * replacement vnode. 138 */ 139 nvp->v_data = vp->v_data; 140 vp->v_data = NULL; 141 vp->v_op = &spec_vops; 142 #ifdef VFSLCKDEBUG 143 vp->v_flag &= ~VLOCKSWORK; 144 #endif 145 vrele(vp); 146 vgone(vp); 147 /* Reinitialize aliased vnode. */ 148 vp = nvp; 149 ip->i_vnode = vp; 150 } 151 152 break; 153 154 case VFIFO: 155 #ifdef FIFO 156 vp->v_op = &ext2fs_fifovops; 157 break; 158 #else 159 return (EOPNOTSUPP); 160 #endif /* FIFO */ 161 162 default: 163 164 break; 165 } 166 167 if (ip->i_number == EXT2_ROOTINO) 168 vp->v_flag |= VROOT; 169 170 /* Initialize modrev times */ 171 getmicrouptime(&tv); 172 ip->i_modrev = (u_quad_t)tv.tv_sec << 32; 173 ip->i_modrev |= (u_quad_t)tv.tv_usec * 4294; 174 175 *vpp = vp; 176 177 return (0); 178 } 179