FreeBSD/Linux Kernel Cross Reference
sys/ufs/ext2fs/ext2fs_subr.c

     /*      $NetBSD: ext2fs_subr.c,v 1.13 2004/03/22 19:23:08 bouyer Exp $  */
     
     /*
      * Copyright (c) 1982, 1986, 1989, 1993
      *      The Regents of the University of California.  All rights reserved.
      *
      * 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. Neither the name of the University 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 REGENTS 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 REGENTS 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.
     *
     *      @(#)ffs_subr.c  8.2 (Berkeley) 9/21/93
     * Modified for ext2fs by Manuel Bouyer.
     */
    
    /*
     * Copyright (c) 1997 Manuel Bouyer.
     *
     * 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 Manuel Bouyer.
     * 4. The name of the author may not be used to endorse or promote products
     *    derived from this software without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
     *
     *      @(#)ffs_subr.c  8.2 (Berkeley) 9/21/93
     * Modified for ext2fs by Manuel Bouyer.
     */
    
    #include <sys/cdefs.h>
    __KERNEL_RCSID(0, "$NetBSD: ext2fs_subr.c,v 1.13 2004/03/22 19:23:08 bouyer Exp $");
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/vnode.h>
    #include <sys/buf.h>
    #include <sys/inttypes.h>
    #include <ufs/ufs/inode.h>
    #include <ufs/ext2fs/ext2fs.h>
    #include <ufs/ext2fs/ext2fs_extern.h>
    
    /*
     * Return buffer with the contents of block "offset" from the beginning of
     * directory "ip".  If "res" is non-zero, fill it in with a pointer to the
     * remaining space in the directory.
     */
    int
    ext2fs_blkatoff(v)
            void *v;
    {
            struct vop_blkatoff_args /* {
                    struct vnode *a_vp;
                    off_t a_offset;
                    char **a_res;
                    struct buf **a_bpp;
            } */ *ap = v;
            struct inode *ip;
            struct m_ext2fs *fs;
            struct buf *bp;
            daddr_t lbn;
            int error;
    
           ip = VTOI(ap->a_vp);
           fs = ip->i_e2fs;
           lbn = lblkno(fs, ap->a_offset);
   
           *ap->a_bpp = NULL;
           if ((error = bread(ap->a_vp, lbn, fs->e2fs_bsize, NOCRED, &bp)) != 0) {
                   brelse(bp);
                   return (error);
           }
           if (ap->a_res)
                   *ap->a_res = (char *)bp->b_data + blkoff(fs, ap->a_offset);
           *ap->a_bpp = bp;
           return (0);
   }
   
   #ifdef DIAGNOSTIC
   void
   ext2fs_checkoverlap(bp, ip)
           struct buf *bp;
           struct inode *ip;
   {
   #if 0
           struct buf *ebp, *ep;
           daddr_t start, last;
           struct vnode *vp;
   
           ebp = &buf[nbuf];
           start = bp->b_blkno;
           last = start + btodb(bp->b_bcount) - 1;
           for (ep = buf; ep < ebp; ep++) {
                   if (ep == bp || (ep->b_flags & B_INVAL) ||
                           ep->b_vp == NULLVP)
                           continue;
                   if (VOP_BMAP(ep->b_vp, (daddr_t)0, &vp, (daddr_t)0, NULL))
                           continue;
                   if (vp != ip->i_devvp)
                           continue;
                   /* look for overlap */
                   if (ep->b_bcount == 0 || ep->b_blkno > last ||
                           ep->b_blkno + btodb(ep->b_bcount) <= start)
                           continue;
                   vprint("Disk overlap", vp);
                   printf("\tstart %" PRId64 ", end %" PRId64 " overlap start "
                           "%" PRId64 ", end %" PRId64 "\n",
                           start, last, ep->b_blkno,
                           ep->b_blkno + btodb(ep->b_bcount) - 1);
                   panic("Disk buffer overlap");
           }
   #else
           printf("ext2fs_checkoverlap disabled due to buffer cache implementation changes\n");
   #endif
   }
   #endif

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