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bfs_sysvbfs.c revision 1.2 
      1 /*	$NetBSD: bfs_sysvbfs.c,v 1.2 2006/05/14 21:31:52 elad 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 1.2 2006/05/14 21:31:52 elad 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 <fs/sysvbfs/bfs.h>
     49 
     50 struct bc_io_ops {
     51 	struct sector_io_ops io;
     52 	struct vnode *vp;
     53 	kauth_cred_t cred;
     54 };
     55 
     56 #define	STATIC
     57 
     58 STATIC boolean_t bc_read_n(void *, uint8_t *, daddr_t, int);
     59 STATIC boolean_t bc_read(void *, uint8_t *, daddr_t);
     60 STATIC boolean_t bc_write_n(void *, uint8_t *, daddr_t, int);
     61 STATIC boolean_t bc_write(void *, uint8_t *, daddr_t);
     62 
     63 int
     64 sysvbfs_bfs_init(struct bfs **bfsp, struct vnode *vp)
     65 {
     66 	struct bc_io_ops *bio;
     67 
     68 	if ((bio = malloc(sizeof(*bio), M_TEMP, M_WAITOK | M_ZERO)) == NULL) {
     69 		printf("can't allocate I/O ops.\n");
     70 		return ENOMEM;
     71 	}
     72 
     73 	bio->io.read = bc_read;
     74 	bio->io.read_n = bc_read_n;
     75 	bio->io.write = bc_write;
     76 	bio->io.write_n = bc_write_n;
     77 	bio->vp = vp;
     78 	bio->cred = NOCRED;	/* sysvbfs layer check cred. */
     79 
     80 	return bfs_init2(bfsp, 0, (struct sector_io_ops *)bio, FALSE);
     81 }
     82 
     83 void
     84 sysvbfs_bfs_fini(struct bfs *bfs)
     85 {
     86 
     87 	free(bfs->io, M_TEMP);
     88 	bfs_fini(bfs);
     89 }
     90 
     91 STATIC boolean_t
     92 bc_read_n(void *self, uint8_t *buf, daddr_t block, int count)
     93 {
     94 	int i;
     95 
     96 	for (i = 0; i < count; i++) {
     97 		if (!bc_read(self, buf, block))
     98 			return FALSE;
     99 		buf += DEV_BSIZE;
    100 		block++;
    101 	}
    102 
    103 	return TRUE;
    104 }
    105 
    106 STATIC boolean_t
    107 bc_read(void *self, uint8_t *buf, daddr_t block)
    108 {
    109 	struct bc_io_ops *bio = self;
    110 	struct buf *bp = NULL;
    111 
    112 	if (bread(bio->vp, block, DEV_BSIZE, bio->cred, &bp) != 0)
    113 		goto error_exit;
    114 	memcpy(buf, bp->b_data, DEV_BSIZE);
    115 	brelse(bp);
    116 
    117 	return TRUE;
    118  error_exit:
    119 	printf("%s: block %lld read failed.\n", __FUNCTION__, block);
    120 
    121 	if (bp != NULL)
    122 		brelse(bp);
    123 	return FALSE;
    124 }
    125 
    126 STATIC boolean_t
    127 bc_write_n(void *self, uint8_t *buf, daddr_t block, int count)
    128 {
    129 	int i;
    130 
    131 	for (i = 0; i < count; i++) {
    132 		if (!bc_write(self, buf, block))
    133 			return FALSE;
    134 		buf += DEV_BSIZE;
    135 		block++;
    136 	}
    137 
    138 	return TRUE;
    139 }
    140 
    141 STATIC boolean_t
    142 bc_write(void *self, uint8_t *buf, daddr_t block)
    143 {
    144 	struct bc_io_ops *bio = self;
    145 	struct buf *bp;
    146 
    147 #if 0
    148 	printf("%s: block=%lld\n", __FUNCTION__, block);
    149 #endif
    150 	if ((bp = getblk(bio->vp, block, DEV_BSIZE, 0, 0)) == 0) {
    151 		printf("getblk failed.\n");
    152 		return FALSE;
    153 	}
    154 	memcpy(bp->b_data, buf, DEV_BSIZE);
    155 
    156 	if (bwrite(bp) != 0) {
    157 		printf("bwrite failed.\n");
    158 		return FALSE;
    159 	}
    160 
    161 	return TRUE;
    162 }
    163