FreeBSD/Linux Kernel Cross Reference
sys/fs/sysvbfs/bfs_sysvbfs.c

     /*      $NetBSD: bfs_sysvbfs.c,v 1.4 2006/07/06 21:55:06 martin Exp $   */
     
     /*-
      * Copyright (c) 2004 The NetBSD Foundation, Inc.
      * All rights reserved.
      *
      * This code is derived from software contributed to The NetBSD Foundation
      * by UCHIYAMA Yasushi.
      *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *        This product includes software developed by the NetBSD
     *        Foundation, Inc. and its contributors.
     * 4. Neither the name of The NetBSD Foundation nor the names of its
     *    contributors may be used to endorse or promote products derived
     *    from this software without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     * POSSIBILITY OF SUCH DAMAGE.
     */
    
    #include <sys/cdefs.h>
    
    __KERNEL_RCSID(0, "$NetBSD: bfs_sysvbfs.c,v 1.4 2006/07/06 21:55:06 martin Exp $");
    
    #include <sys/param.h>
    #include <sys/types.h>
    #include <sys/systm.h>
    #include <sys/buf.h>
    #include <sys/malloc.h>
    #include <sys/kauth.h>
    #include <fs/sysvbfs/bfs.h>
    
    struct bc_io_ops {
            struct sector_io_ops io;
            struct vnode *vp;
            kauth_cred_t cred;
    };
    
    #define STATIC
    
    STATIC boolean_t bc_read_n(void *, uint8_t *, daddr_t, int);
    STATIC boolean_t bc_read(void *, uint8_t *, daddr_t);
    STATIC boolean_t bc_write_n(void *, uint8_t *, daddr_t, int);
    STATIC boolean_t bc_write(void *, uint8_t *, daddr_t);
    
    int
    sysvbfs_bfs_init(struct bfs **bfsp, struct vnode *vp)
    {
            struct bc_io_ops *bio;
    
            if ((bio = malloc(sizeof(*bio), M_TEMP, M_WAITOK | M_ZERO)) == NULL) {
                    printf("can't allocate I/O ops.\n");
                    return ENOMEM;
            }
    
            bio->io.read = bc_read;
            bio->io.read_n = bc_read_n;
            bio->io.write = bc_write;
            bio->io.write_n = bc_write_n;
            bio->vp = vp;
            bio->cred = NOCRED;     /* sysvbfs layer check cred. */
    
            return bfs_init2(bfsp, 0, (struct sector_io_ops *)bio, FALSE);
    }
    
    void
    sysvbfs_bfs_fini(struct bfs *bfs)
    {
    
            free(bfs->io, M_TEMP);
            bfs_fini(bfs);
    }
    
    STATIC boolean_t
    bc_read_n(void *self, uint8_t *buf, daddr_t block, int count)
    {
            int i;
    
            for (i = 0; i < count; i++) {
                    if (!bc_read(self, buf, block))
                            return FALSE;
                   buf += DEV_BSIZE;
                   block++;
           }
   
           return TRUE;
   }
   
   STATIC boolean_t
   bc_read(void *self, uint8_t *buf, daddr_t block)
   {
           struct bc_io_ops *bio = self;
           struct buf *bp = NULL;
   
           if (bread(bio->vp, block, DEV_BSIZE, bio->cred, &bp) != 0)
                   goto error_exit;
           memcpy(buf, bp->b_data, DEV_BSIZE);
           brelse(bp);
   
           return TRUE;
    error_exit:
           printf("%s: block %lld read failed.\n", __FUNCTION__, 
               (long long int)block);
   
           if (bp != NULL)
                   brelse(bp);
           return FALSE;
   }
   
   STATIC boolean_t
   bc_write_n(void *self, uint8_t *buf, daddr_t block, int count)
   {
           int i;
   
           for (i = 0; i < count; i++) {
                   if (!bc_write(self, buf, block))
                           return FALSE;
                   buf += DEV_BSIZE;
                   block++;
           }
   
           return TRUE;
   }
   
   STATIC boolean_t
   bc_write(void *self, uint8_t *buf, daddr_t block)
   {
           struct bc_io_ops *bio = self;
           struct buf *bp;
   
   #if 0
           printf("%s: block=%lld\n", __FUNCTION__, block);
   #endif
           if ((bp = getblk(bio->vp, block, DEV_BSIZE, 0, 0)) == 0) {
                   printf("getblk failed.\n");
                   return FALSE;
           }
           memcpy(bp->b_data, buf, DEV_BSIZE);
   
           if (bwrite(bp) != 0) {
                   printf("bwrite failed.\n");
                   return FALSE;
           }
   
           return TRUE;
   }

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