diff options
Diffstat (limited to 'sys/fs/ext2fs/ext2_subr.c')
| -rw-r--r-- | sys/fs/ext2fs/ext2_subr.c | 120 |
1 files changed, 120 insertions, 0 deletions
diff --git a/sys/fs/ext2fs/ext2_subr.c b/sys/fs/ext2fs/ext2_subr.c new file mode 100644 index 0000000..dcb1b7c --- /dev/null +++ b/sys/fs/ext2fs/ext2_subr.c @@ -0,0 +1,120 @@ +/*- + * modified for Lites 1.1 + * + * Aug 1995, Godmar Back (gback@cs.utah.edu) + * University of Utah, Department of Computer Science + */ +/*- + * 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. + * 4. 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 + * $FreeBSD$ + */ + +#include <sys/param.h> + +#include <sys/proc.h> +#include <sys/systm.h> +#include <sys/bio.h> +#include <sys/buf.h> +#include <sys/lock.h> +#include <sys/ucred.h> +#include <sys/vnode.h> + +#include <fs/ext2fs/inode.h> +#include <fs/ext2fs/ext2_extern.h> +#include <fs/ext2fs/ext2fs.h> +#include <fs/ext2fs/fs.h> + +#ifdef KDB +void ext2_checkoverlap(struct buf *, struct inode *); +#endif + +/* + * 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 +ext2_blkatoff(vp, offset, res, bpp) + struct vnode *vp; + off_t offset; + char **res; + struct buf **bpp; +{ + struct inode *ip; + struct m_ext2fs *fs; + struct buf *bp; + int32_t lbn; + int bsize, error; + + ip = VTOI(vp); + fs = ip->i_e2fs; + lbn = lblkno(fs, offset); + bsize = blksize(fs, ip, lbn); + + *bpp = NULL; + if ((error = bread(vp, lbn, bsize, NOCRED, &bp)) != 0) { + brelse(bp); + return (error); + } + if (res) + *res = (char *)bp->b_data + blkoff(fs, offset); + *bpp = bp; + return (0); +} + +#ifdef KDB +void +ext2_checkoverlap(bp, ip) + struct buf *bp; + struct inode *ip; +{ + struct buf *ebp, *ep; + int32_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)) + continue; + vp = ip->i_devvp; + /* 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); + (void)printf("\tstart %d, end %d overlap start %lld, end %ld\n", + start, last, (long long)ep->b_blkno, + (long)(ep->b_blkno + btodb(ep->b_bcount) - 1)); + panic("Disk buffer overlap"); + } +} +#endif /* KDB */ |
