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bfs_sysvbfs.c revision 1.3 
      1 /*	$NetBSD: bfs_sysvbfs.c,v 1.3 2006/05/15 11:16:16 yamt 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  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *        This product includes software developed by the NetBSD
     21  *        Foundation, Inc. and its contributors.
     22  * 4. Neither the name of The NetBSD Foundation nor the names of its
     23  *    contributors may be used to endorse or promote products derived
     24  *    from this software without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     36  * POSSIBILITY OF SUCH DAMAGE.
     37  */
     38 
     39 #include <sys/cdefs.h>
     40 
     41 __KERNEL_RCSID(0, "$NetBSD: bfs_sysvbfs.c,v 1.3 2006/05/15 11:16:16 yamt Exp $");
     42 
     43 #include <sys/param.h>
     44 #include <sys/types.h>
     45 #include <sys/systm.h>
     46 #include <sys/buf.h>
     47 #include <sys/malloc.h>
     48 #include <sys/kauth.h>
     49 #include <fs/sysvbfs/bfs.h>
     50 
     51 struct bc_io_ops {
     52 	struct sector_io_ops io;
     53 	struct vnode *vp;
     54 	kauth_cred_t cred;
     55 };
     56 
     57 #define	STATIC
     58 
     59 STATIC boolean_t bc_read_n(void *, uint8_t *, daddr_t, int);
     60 STATIC boolean_t bc_read(void *, uint8_t *, daddr_t);
     61 STATIC boolean_t bc_write_n(void *, uint8_t *, daddr_t, int);
     62 STATIC boolean_t bc_write(void *, uint8_t *, daddr_t);
     63 
     64 int
     65 sysvbfs_bfs_init(struct bfs **bfsp, struct vnode *vp)
     66 {
     67 	struct bc_io_ops *bio;
     68 
     69 	if ((bio = malloc(sizeof(*bio), M_TEMP, M_WAITOK | M_ZERO)) == NULL) {
     70 		printf("can't allocate I/O ops.\n");
     71 		return ENOMEM;
     72 	}
     73 
     74 	bio->io.read = bc_read;
     75 	bio->io.read_n = bc_read_n;
     76 	bio->io.write = bc_write;
     77 	bio->io.write_n = bc_write_n;
     78 	bio->vp = vp;
     79 	bio->cred = NOCRED;	/* sysvbfs layer check cred. */
     80 
     81 	return bfs_init2(bfsp, 0, (struct sector_io_ops *)bio, FALSE);
     82 }
     83 
     84 void
     85 sysvbfs_bfs_fini(struct bfs *bfs)
     86 {
     87 
     88 	free(bfs->io, M_TEMP);
     89 	bfs_fini(bfs);
     90 }
     91 
     92 STATIC boolean_t
     93 bc_read_n(void *self, uint8_t *buf, daddr_t block, int count)
     94 {
     95 	int i;
     96 
     97 	for (i = 0; i < count; i++) {
     98 		if (!bc_read(self, buf, block))
     99 			return FALSE;
    100 		buf += DEV_BSIZE;
    101 		block++;
    102 	}
    103 
    104 	return TRUE;
    105 }
    106 
    107 STATIC boolean_t
    108 bc_read(void *self, uint8_t *buf, daddr_t block)
    109 {
    110 	struct bc_io_ops *bio = self;
    111 	struct buf *bp = NULL;
    112 
    113 	if (bread(bio->vp, block, DEV_BSIZE, bio->cred, &bp) != 0)
    114 		goto error_exit;
    115 	memcpy(buf, bp->b_data, DEV_BSIZE);
    116 	brelse(bp);
    117 
    118 	return TRUE;
    119  error_exit:
    120 	printf("%s: block %lld read failed.\n", __FUNCTION__, block);
    121 
    122 	if (bp != NULL)
    123 		brelse(bp);
    124 	return FALSE;
    125 }
    126 
    127 STATIC boolean_t
    128 bc_write_n(void *self, uint8_t *buf, daddr_t block, int count)
    129 {
    130 	int i;
    131 
    132 	for (i = 0; i < count; i++) {
    133 		if (!bc_write(self, buf, block))
    134 			return FALSE;
    135 		buf += DEV_BSIZE;
    136 		block++;
    137 	}
    138 
    139 	return TRUE;
    140 }
    141 
    142 STATIC boolean_t
    143 bc_write(void *self, uint8_t *buf, daddr_t block)
    144 {
    145 	struct bc_io_ops *bio = self;
    146 	struct buf *bp;
    147 
    148 #if 0
    149 	printf("%s: block=%lld\n", __FUNCTION__, block);
    150 #endif
    151 	if ((bp = getblk(bio->vp, block, DEV_BSIZE, 0, 0)) == 0) {
    152 		printf("getblk failed.\n");
    153 		return FALSE;
    154 	}
    155 	memcpy(bp->b_data, buf, DEV_BSIZE);
    156 
    157 	if (bwrite(bp) != 0) {
    158 		printf("bwrite failed.\n");
    159 		return FALSE;
    160 	}
    161 
    162 	return TRUE;
    163 }
    164