ext2_subr.c

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    1 /*-
    2  *  modified for Lites 1.1
    3  *
    4  *  Aug 1995, Godmar Back (gback@cs.utah.edu)
    5  *  University of Utah, Department of Computer Science
    6  */
    7 /*-
    8  * Copyright (c) 1982, 1986, 1989, 1993
    9  *      The Regents of the University of California.  All rights reserved.
   10  *
   11  * Redistribution and use in source and binary forms, with or without
   12  * modification, are permitted provided that the following conditions
   13  * are met:
   14  * 1. Redistributions of source code must retain the above copyright
   15  *    notice, this list of conditions and the following disclaimer.
   16  * 2. Redistributions in binary form must reproduce the above copyright
   17  *    notice, this list of conditions and the following disclaimer in the
   18  *    documentation and/or other materials provided with the distribution.
   19  * 4. Neither the name of the University nor the names of its contributors
   20  *    may be used to endorse or promote products derived from this software
   21  *    without specific prior written permission.
   22  *
   23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   33  * SUCH DAMAGE.
   34  *
   35  *      @(#)ffs_subr.c  8.2 (Berkeley) 9/21/93
   36  * $FreeBSD: releng/9.0/sys/fs/ext2fs/ext2_subr.c 217594 2011-01-19 19:49:48Z jhb $
   37  */
   38 
   39 #include <sys/param.h>
   40 
   41 #include <sys/proc.h>
   42 #include <sys/systm.h>
   43 #include <sys/bio.h>
   44 #include <sys/buf.h>
   45 #include <sys/lock.h>
   46 #include <sys/ucred.h>
   47 #include <sys/vnode.h>
   48 
   49 #include <fs/ext2fs/inode.h>
   50 #include <fs/ext2fs/ext2_extern.h>
   51 #include <fs/ext2fs/ext2fs.h>
   52 #include <fs/ext2fs/fs.h>
   53 
   54 #ifdef KDB
   55 #include <fs/ext2fs/ext2_mount.h>
   56 
   57 void    ext2_checkoverlap(struct buf *, struct inode *);
   58 #endif
   59 
   60 /*
   61  * Return buffer with the contents of block "offset" from the beginning of
   62  * directory "ip".  If "res" is non-zero, fill it in with a pointer to the
   63  * remaining space in the directory.
   64  */
   65 int
   66 ext2_blkatoff(vp, offset, res, bpp)
   67         struct vnode *vp;
   68         off_t offset;
   69         char **res;
   70         struct buf **bpp;
   71 {
   72         struct inode *ip;
   73         struct m_ext2fs *fs;
   74         struct buf *bp;
   75         int32_t lbn;
   76         int bsize, error;
   77 
   78         ip = VTOI(vp);
   79         fs = ip->i_e2fs;
   80         lbn = lblkno(fs, offset);
   81         bsize = blksize(fs, ip, lbn);
   82 
   83         *bpp = NULL;
   84         if ((error = bread(vp, lbn, bsize, NOCRED, &bp)) != 0) {
   85                 brelse(bp);
   86                 return (error);
   87         }
   88         if (res)
   89                 *res = (char *)bp->b_data + blkoff(fs, offset);
   90         *bpp = bp;
   91         return (0);
   92 }
   93 
   94 #ifdef KDB
   95 void
   96 ext2_checkoverlap(bp, ip)
   97         struct buf *bp;
   98         struct inode *ip;
   99 {
  100         struct buf *ebp, *ep;
  101         int32_t start, last;
  102         struct vnode *vp;
  103 
  104         ebp = &buf[nbuf];
  105         start = bp->b_blkno;
  106         last = start + btodb(bp->b_bcount) - 1;
  107         for (ep = buf; ep < ebp; ep++) {
  108                 if (ep == bp || (ep->b_flags & B_INVAL))
  109                         continue;
  110                 vp = ip->i_ump->um_devvp;
  111                 /* look for overlap */
  112                 if (ep->b_bcount == 0 || ep->b_blkno > last ||
  113                     ep->b_blkno + btodb(ep->b_bcount) <= start)
  114                         continue;
  115                 vprint("Disk overlap", vp);
  116                 (void)printf("\tstart %d, end %d overlap start %lld, end %ld\n",
  117                         start, last, (long long)ep->b_blkno,
  118                         (long)(ep->b_blkno + btodb(ep->b_bcount) - 1));
  119                 panic("Disk buffer overlap");
  120         }
  121 }
  122 #endif /* KDB */

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FreeBSD/Linux Kernel Cross Reference sys/fs/ext2fs/ext2_subr.c

FreeBSD/Linux Kernel Cross Reference
sys/fs/ext2fs/ext2_subr.c