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      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