1 /* $NetBSD: bfs_sysvbfs.c,v 1.11 2015/03/28 19:24:05 maxv Exp $ */ 2 3 /*- 4 * Copyright (c) 2004 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by UCHIYAMA Yasushi. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 34 __KERNEL_RCSID(0, "$NetBSD: bfs_sysvbfs.c,v 1.11 2015/03/28 19:24:05 maxv Exp $"); 35 36 #include <sys/param.h> 37 #include <sys/types.h> 38 #include <sys/systm.h> 39 #include <sys/buf.h> 40 #include <sys/malloc.h> 41 #include <sys/kauth.h> 42 #include <fs/sysvbfs/bfs.h> 43 44 struct bc_io_ops { 45 struct sector_io_ops io; 46 struct vnode *vp; 47 kauth_cred_t cred; 48 }; 49 50 #define STATIC 51 52 STATIC bool bc_read_n(void *, uint8_t *, daddr_t, int); 53 STATIC bool bc_read(void *, uint8_t *, daddr_t); 54 STATIC bool bc_write_n(void *, uint8_t *, daddr_t, int); 55 STATIC bool bc_write(void *, uint8_t *, daddr_t); 56 57 int 58 sysvbfs_bfs_init(struct bfs **bfsp, struct vnode *vp) 59 { 60 struct bc_io_ops *bio; 61 62 if ((bio = malloc(sizeof(*bio), M_TEMP, M_WAITOK | M_ZERO)) == NULL) { 63 printf("can't allocate I/O ops.\n"); 64 return ENOMEM; 65 } 66 67 bio->io.read = bc_read; 68 bio->io.read_n = bc_read_n; 69 bio->io.write = bc_write; 70 bio->io.write_n = bc_write_n; 71 bio->vp = vp; 72 bio->cred = NOCRED; /* sysvbfs layer check cred. */ 73 74 return bfs_init2(bfsp, 0, (struct sector_io_ops *)bio, false); 75 } 76 77 void 78 sysvbfs_bfs_fini(struct bfs *bfs) 79 { 80 81 free(bfs->io, M_TEMP); 82 bfs_fini(bfs); 83 } 84 85 STATIC bool 86 bc_read_n(void *self, uint8_t *buf, daddr_t block, int count) 87 { 88 int i; 89 90 for (i = 0; i < count; i++) { 91 if (!bc_read(self, buf, block)) 92 return false; 93 buf += DEV_BSIZE; 94 block++; 95 } 96 97 return true; 98 } 99 100 STATIC bool 101 bc_read(void *self, uint8_t *buf, daddr_t block) 102 { 103 struct bc_io_ops *bio = self; 104 struct buf *bp = NULL; 105 106 if (bread(bio->vp, block, DEV_BSIZE, 0, &bp) != 0) 107 goto error_exit; 108 memcpy(buf, bp->b_data, DEV_BSIZE); 109 brelse(bp, 0); 110 111 return true; 112 error_exit: 113 printf("%s: block %lld read failed.\n", __func__, 114 (long long int)block); 115 116 if (bp != NULL) 117 brelse(bp, 0); 118 return false; 119 } 120 121 STATIC bool 122 bc_write_n(void *self, uint8_t *buf, daddr_t block, int count) 123 { 124 int i; 125 126 for (i = 0; i < count; i++) { 127 if (!bc_write(self, buf, block)) 128 return false; 129 buf += DEV_BSIZE; 130 block++; 131 } 132 133 return true; 134 } 135 136 STATIC bool 137 bc_write(void *self, uint8_t *buf, daddr_t block) 138 { 139 struct bc_io_ops *bio = self; 140 struct buf *bp; 141 142 #if 0 143 printf("%s: block=%lld\n", __func__, block); 144 #endif 145 if ((bp = getblk(bio->vp, block, DEV_BSIZE, 0, 0)) == 0) { 146 printf("getblk failed.\n"); 147 return false; 148 } 149 memcpy(bp->b_data, buf, DEV_BSIZE); 150 151 if (bwrite(bp) != 0) { 152 printf("bwrite failed.\n"); 153 return false; 154 } 155 156 return true; 157 } 158