719 lines
16 KiB
C
719 lines
16 KiB
C
/* $NetBSD: ufs.c,v 1.19 1997/06/26 19:11:55 drochner Exp $ */
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/*-
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* Copyright (c) 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* The Mach Operating System project at Carnegie-Mellon University.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*
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* Copyright (c) 1990, 1991 Carnegie Mellon University
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* All Rights Reserved.
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*
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* Author: David Golub
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*
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* Permission to use, copy, modify and distribute this software and its
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* documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
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* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie the
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* rights to redistribute these changes.
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*/
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/*
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* Stand-alone file reading package.
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*/
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#include <sys/param.h>
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#include <sys/time.h>
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#include <ufs/ffs/fs.h>
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#include <ufs/ufs/dinode.h>
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#include <ufs/ufs/dir.h>
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#ifdef _STANDALONE
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#include <lib/libkern/libkern.h>
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#else
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#include <string.h>
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inline u_int
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max(a, b)
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u_int a, b;
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{
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return (a > b ? a : b);
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}
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#endif
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#include "stand.h"
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/*
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* In-core open file.
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*/
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struct file {
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off_t f_seekp; /* seek pointer */
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struct fs *f_fs; /* pointer to super-block */
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struct dinode f_di; /* copy of on-disk inode */
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int f_nindir[NIADDR];
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/* number of blocks mapped by
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indirect block at level i */
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char *f_blk[NIADDR]; /* buffer for indirect block at
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level i */
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size_t f_blksize[NIADDR];
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/* size of buffer */
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daddr_t f_blkno[NIADDR];/* disk address of block in buffer */
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char *f_buf; /* buffer for data block */
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size_t f_buf_size; /* size of data block */
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daddr_t f_buf_blkno; /* block number of data block */
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};
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static int read_inode __P((ino_t, struct open_file *));
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static int block_map __P((struct open_file *, daddr_t, daddr_t *));
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static int buf_read_file __P((struct open_file *, char **, size_t *));
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static int search_directory __P((char *, struct open_file *, ino_t *));
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#ifdef COMPAT_UFS
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static void ffs_oldfscompat __P((struct fs *));
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#endif
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/*
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* Read a new inode into a file structure.
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*/
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static int
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read_inode(inumber, f)
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ino_t inumber;
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struct open_file *f;
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{
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register struct file *fp = (struct file *)f->f_fsdata;
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register struct fs *fs = fp->f_fs;
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char *buf;
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size_t rsize;
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int rc;
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/*
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* Read inode and save it.
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*/
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buf = alloc(fs->fs_bsize);
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twiddle();
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rc = (f->f_dev->dv_strategy)(f->f_devdata, F_READ,
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fsbtodb(fs, ino_to_fsba(fs, inumber)), fs->fs_bsize,
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buf, &rsize);
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if (rc)
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goto out;
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if (rsize != fs->fs_bsize) {
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rc = EIO;
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goto out;
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}
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{
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register struct dinode *dp;
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dp = (struct dinode *)buf;
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fp->f_di = dp[ino_to_fsbo(fs, inumber)];
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}
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/*
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* Clear out the old buffers
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*/
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{
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register int level;
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for (level = 0; level < NIADDR; level++)
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fp->f_blkno[level] = -1;
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fp->f_buf_blkno = -1;
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}
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out:
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free(buf, fs->fs_bsize);
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return (rc);
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}
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/*
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* Given an offset in a file, find the disk block number that
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* contains that block.
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*/
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static int
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block_map(f, file_block, disk_block_p)
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struct open_file *f;
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daddr_t file_block;
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daddr_t *disk_block_p; /* out */
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{
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register struct file *fp = (struct file *)f->f_fsdata;
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register struct fs *fs = fp->f_fs;
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int level;
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int idx;
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daddr_t ind_block_num;
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daddr_t *ind_p;
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int rc;
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/*
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* Index structure of an inode:
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*
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* di_db[0..NDADDR-1] hold block numbers for blocks
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* 0..NDADDR-1
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*
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* di_ib[0] index block 0 is the single indirect block
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* holds block numbers for blocks
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* NDADDR .. NDADDR + NINDIR(fs)-1
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*
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* di_ib[1] index block 1 is the double indirect block
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* holds block numbers for INDEX blocks for blocks
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* NDADDR + NINDIR(fs) ..
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* NDADDR + NINDIR(fs) + NINDIR(fs)**2 - 1
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*
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* di_ib[2] index block 2 is the triple indirect block
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* holds block numbers for double-indirect
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* blocks for blocks
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* NDADDR + NINDIR(fs) + NINDIR(fs)**2 ..
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* NDADDR + NINDIR(fs) + NINDIR(fs)**2
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* + NINDIR(fs)**3 - 1
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*/
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if (file_block < NDADDR) {
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/* Direct block. */
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*disk_block_p = fp->f_di.di_db[file_block];
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return (0);
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}
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file_block -= NDADDR;
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/*
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* nindir[0] = NINDIR
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* nindir[1] = NINDIR**2
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* nindir[2] = NINDIR**3
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* etc
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*/
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for (level = 0; level < NIADDR; level++) {
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if (file_block < fp->f_nindir[level])
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break;
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file_block -= fp->f_nindir[level];
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}
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if (level == NIADDR) {
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/* Block number too high */
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return (EFBIG);
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}
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ind_block_num = fp->f_di.di_ib[level];
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for (; level >= 0; level--) {
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if (ind_block_num == 0) {
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*disk_block_p = 0; /* missing */
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return (0);
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}
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if (fp->f_blkno[level] != ind_block_num) {
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if (fp->f_blk[level] == (char *)0)
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fp->f_blk[level] =
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alloc(fs->fs_bsize);
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twiddle();
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rc = (f->f_dev->dv_strategy)(f->f_devdata, F_READ,
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fsbtodb(fp->f_fs, ind_block_num),
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fs->fs_bsize,
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fp->f_blk[level],
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&fp->f_blksize[level]);
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if (rc)
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return (rc);
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if (fp->f_blksize[level] != fs->fs_bsize)
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return (EIO);
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fp->f_blkno[level] = ind_block_num;
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}
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ind_p = (daddr_t *)fp->f_blk[level];
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if (level > 0) {
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idx = file_block / fp->f_nindir[level - 1];
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file_block %= fp->f_nindir[level - 1];
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} else
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idx = file_block;
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ind_block_num = ind_p[idx];
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}
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*disk_block_p = ind_block_num;
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return (0);
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}
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/*
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* Read a portion of a file into an internal buffer. Return
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* the location in the buffer and the amount in the buffer.
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*/
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static int
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buf_read_file(f, buf_p, size_p)
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struct open_file *f;
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char **buf_p; /* out */
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size_t *size_p; /* out */
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{
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register struct file *fp = (struct file *)f->f_fsdata;
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register struct fs *fs = fp->f_fs;
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long off;
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register daddr_t file_block;
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daddr_t disk_block;
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size_t block_size;
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int rc;
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off = blkoff(fs, fp->f_seekp);
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file_block = lblkno(fs, fp->f_seekp);
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block_size = dblksize(fs, &fp->f_di, file_block);
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if (file_block != fp->f_buf_blkno) {
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rc = block_map(f, file_block, &disk_block);
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if (rc)
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return (rc);
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if (fp->f_buf == (char *)0)
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fp->f_buf = alloc(fs->fs_bsize);
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if (disk_block == 0) {
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bzero(fp->f_buf, block_size);
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fp->f_buf_size = block_size;
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} else {
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twiddle();
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rc = (f->f_dev->dv_strategy)(f->f_devdata, F_READ,
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fsbtodb(fs, disk_block),
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block_size, fp->f_buf, &fp->f_buf_size);
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if (rc)
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return (rc);
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}
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fp->f_buf_blkno = file_block;
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}
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/*
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* Return address of byte in buffer corresponding to
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* offset, and size of remainder of buffer after that
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* byte.
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*/
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*buf_p = fp->f_buf + off;
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*size_p = block_size - off;
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/*
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* But truncate buffer at end of file.
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*/
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if (*size_p > fp->f_di.di_size - fp->f_seekp)
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*size_p = fp->f_di.di_size - fp->f_seekp;
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return (0);
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}
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/*
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* Search a directory for a name and return its
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* i_number.
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*/
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static int
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search_directory(name, f, inumber_p)
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char *name;
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struct open_file *f;
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ino_t *inumber_p; /* out */
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{
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register struct file *fp = (struct file *)f->f_fsdata;
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register struct direct *dp;
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struct direct *edp;
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char *buf;
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size_t buf_size;
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int namlen, length;
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int rc;
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length = strlen(name);
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fp->f_seekp = 0;
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while (fp->f_seekp < fp->f_di.di_size) {
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rc = buf_read_file(f, &buf, &buf_size);
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if (rc)
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return (rc);
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dp = (struct direct *)buf;
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edp = (struct direct *)(buf + buf_size);
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while (dp < edp) {
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if (dp->d_ino == (ino_t)0)
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goto next;
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#if BYTE_ORDER == LITTLE_ENDIAN
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if (fp->f_fs->fs_maxsymlinklen <= 0)
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namlen = dp->d_type;
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else
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#endif
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namlen = dp->d_namlen;
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if (namlen == length &&
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!strcmp(name, dp->d_name)) {
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/* found entry */
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*inumber_p = dp->d_ino;
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return (0);
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}
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next:
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dp = (struct direct *)((char *)dp + dp->d_reclen);
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}
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fp->f_seekp += buf_size;
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}
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return (ENOENT);
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}
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/*
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* Open a file.
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*/
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int
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ufs_open(path, f)
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char *path;
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struct open_file *f;
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{
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register char *cp, *ncp;
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register int c;
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ino_t inumber, parent_inumber;
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struct file *fp;
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struct fs *fs;
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int rc;
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size_t buf_size;
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int nlinks = 0;
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char namebuf[MAXPATHLEN+1];
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char *buf = NULL;
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/* allocate file system specific data structure */
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fp = alloc(sizeof(struct file));
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bzero(fp, sizeof(struct file));
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f->f_fsdata = (void *)fp;
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/* allocate space and read super block */
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fs = alloc(SBSIZE);
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fp->f_fs = fs;
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twiddle();
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rc = (f->f_dev->dv_strategy)(f->f_devdata, F_READ,
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SBLOCK, SBSIZE, (char *)fs, &buf_size);
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if (rc)
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goto out;
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if (buf_size != SBSIZE || fs->fs_magic != FS_MAGIC ||
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fs->fs_bsize > MAXBSIZE || fs->fs_bsize < sizeof(struct fs)) {
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rc = EINVAL;
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goto out;
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}
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#ifdef COMPAT_UFS
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ffs_oldfscompat(fs);
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#endif
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|
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/*
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* Calculate indirect block levels.
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*/
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{
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register int mult;
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register int level;
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|
|
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mult = 1;
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for (level = 0; level < NIADDR; level++) {
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mult *= NINDIR(fs);
|
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fp->f_nindir[level] = mult;
|
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}
|
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}
|
|
|
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inumber = ROOTINO;
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if ((rc = read_inode(inumber, f)) != 0)
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goto out;
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|
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cp = path;
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while (*cp) {
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|
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/*
|
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* Remove extra separators
|
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*/
|
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while (*cp == '/')
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cp++;
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if (*cp == '\0')
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break;
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|
|
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/*
|
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* Check that current node is a directory.
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*/
|
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if ((fp->f_di.di_mode & IFMT) != IFDIR) {
|
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rc = ENOTDIR;
|
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goto out;
|
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}
|
|
|
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/*
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* Get next component of path name.
|
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*/
|
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{
|
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register int len = 0;
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|
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ncp = cp;
|
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while ((c = *cp) != '\0' && c != '/') {
|
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if (++len > MAXNAMLEN) {
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rc = ENOENT;
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goto out;
|
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}
|
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cp++;
|
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}
|
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*cp = '\0';
|
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}
|
|
|
|
/*
|
|
* Look up component in current directory.
|
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* Save directory inumber in case we find a
|
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* symbolic link.
|
|
*/
|
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parent_inumber = inumber;
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rc = search_directory(ncp, f, &inumber);
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*cp = c;
|
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if (rc)
|
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goto out;
|
|
|
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/*
|
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* Open next component.
|
|
*/
|
|
if ((rc = read_inode(inumber, f)) != 0)
|
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goto out;
|
|
|
|
/*
|
|
* Check for symbolic link.
|
|
*/
|
|
if ((fp->f_di.di_mode & IFMT) == IFLNK) {
|
|
int link_len = fp->f_di.di_size;
|
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int len;
|
|
|
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len = strlen(cp);
|
|
|
|
if (link_len + len > MAXPATHLEN ||
|
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++nlinks > MAXSYMLINKS) {
|
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rc = ENOENT;
|
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goto out;
|
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}
|
|
|
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bcopy(cp, &namebuf[link_len], len + 1);
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|
|
if (link_len < fs->fs_maxsymlinklen) {
|
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bcopy(fp->f_di.di_shortlink, namebuf,
|
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(unsigned) link_len);
|
|
} else {
|
|
/*
|
|
* Read file for symbolic link
|
|
*/
|
|
size_t buf_size;
|
|
daddr_t disk_block;
|
|
register struct fs *fs = fp->f_fs;
|
|
|
|
if (!buf)
|
|
buf = alloc(fs->fs_bsize);
|
|
rc = block_map(f, (daddr_t)0, &disk_block);
|
|
if (rc)
|
|
goto out;
|
|
|
|
twiddle();
|
|
rc = (f->f_dev->dv_strategy)(f->f_devdata,
|
|
F_READ, fsbtodb(fs, disk_block),
|
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fs->fs_bsize, buf, &buf_size);
|
|
if (rc)
|
|
goto out;
|
|
|
|
bcopy((char *)buf, namebuf, (unsigned)link_len);
|
|
}
|
|
|
|
/*
|
|
* If relative pathname, restart at parent directory.
|
|
* If absolute pathname, restart at root.
|
|
*/
|
|
cp = namebuf;
|
|
if (*cp != '/')
|
|
inumber = parent_inumber;
|
|
else
|
|
inumber = (ino_t)ROOTINO;
|
|
|
|
if ((rc = read_inode(inumber, f)) != 0)
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Found terminal component.
|
|
*/
|
|
rc = 0;
|
|
out:
|
|
if (buf)
|
|
free(buf, fs->fs_bsize);
|
|
if (rc) {
|
|
if (fp->f_buf)
|
|
free(fp->f_buf, fp->f_fs->fs_bsize);
|
|
free(fp->f_fs, SBSIZE);
|
|
free(fp, sizeof(struct file));
|
|
}
|
|
return (rc);
|
|
}
|
|
|
|
int
|
|
ufs_close(f)
|
|
struct open_file *f;
|
|
{
|
|
register struct file *fp = (struct file *)f->f_fsdata;
|
|
int level;
|
|
|
|
f->f_fsdata = (void *)0;
|
|
if (fp == (struct file *)0)
|
|
return (0);
|
|
|
|
for (level = 0; level < NIADDR; level++) {
|
|
if (fp->f_blk[level])
|
|
free(fp->f_blk[level], fp->f_fs->fs_bsize);
|
|
}
|
|
if (fp->f_buf)
|
|
free(fp->f_buf, fp->f_fs->fs_bsize);
|
|
free(fp->f_fs, SBSIZE);
|
|
free(fp, sizeof(struct file));
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Copy a portion of a file into kernel memory.
|
|
* Cross block boundaries when necessary.
|
|
*/
|
|
int
|
|
ufs_read(f, start, size, resid)
|
|
struct open_file *f;
|
|
void *start;
|
|
size_t size;
|
|
size_t *resid; /* out */
|
|
{
|
|
register struct file *fp = (struct file *)f->f_fsdata;
|
|
register size_t csize;
|
|
char *buf;
|
|
size_t buf_size;
|
|
int rc = 0;
|
|
register char *addr = start;
|
|
|
|
while (size != 0) {
|
|
if (fp->f_seekp >= fp->f_di.di_size)
|
|
break;
|
|
|
|
rc = buf_read_file(f, &buf, &buf_size);
|
|
if (rc)
|
|
break;
|
|
|
|
csize = size;
|
|
if (csize > buf_size)
|
|
csize = buf_size;
|
|
|
|
bcopy(buf, addr, csize);
|
|
|
|
fp->f_seekp += csize;
|
|
addr += csize;
|
|
size -= csize;
|
|
}
|
|
if (resid)
|
|
*resid = size;
|
|
return (rc);
|
|
}
|
|
|
|
/*
|
|
* Not implemented.
|
|
*/
|
|
int
|
|
ufs_write(f, start, size, resid)
|
|
struct open_file *f;
|
|
void *start;
|
|
size_t size;
|
|
size_t *resid; /* out */
|
|
{
|
|
|
|
return (EROFS);
|
|
}
|
|
|
|
off_t
|
|
ufs_seek(f, offset, where)
|
|
struct open_file *f;
|
|
off_t offset;
|
|
int where;
|
|
{
|
|
register struct file *fp = (struct file *)f->f_fsdata;
|
|
|
|
switch (where) {
|
|
case SEEK_SET:
|
|
fp->f_seekp = offset;
|
|
break;
|
|
case SEEK_CUR:
|
|
fp->f_seekp += offset;
|
|
break;
|
|
case SEEK_END:
|
|
fp->f_seekp = fp->f_di.di_size - offset;
|
|
break;
|
|
default:
|
|
return (-1);
|
|
}
|
|
return (fp->f_seekp);
|
|
}
|
|
|
|
int
|
|
ufs_stat(f, sb)
|
|
struct open_file *f;
|
|
struct stat *sb;
|
|
{
|
|
register struct file *fp = (struct file *)f->f_fsdata;
|
|
|
|
/* only important stuff */
|
|
sb->st_mode = fp->f_di.di_mode;
|
|
sb->st_uid = fp->f_di.di_uid;
|
|
sb->st_gid = fp->f_di.di_gid;
|
|
sb->st_size = fp->f_di.di_size;
|
|
return (0);
|
|
}
|
|
|
|
#ifdef COMPAT_UFS
|
|
/*
|
|
* Sanity checks for old file systems.
|
|
*
|
|
* XXX - goes away some day.
|
|
*/
|
|
static void
|
|
ffs_oldfscompat(fs)
|
|
struct fs *fs;
|
|
{
|
|
int i;
|
|
|
|
fs->fs_npsect = max(fs->fs_npsect, fs->fs_nsect); /* XXX */
|
|
fs->fs_interleave = max(fs->fs_interleave, 1); /* XXX */
|
|
if (fs->fs_postblformat == FS_42POSTBLFMT) /* XXX */
|
|
fs->fs_nrpos = 8; /* XXX */
|
|
if (fs->fs_inodefmt < FS_44INODEFMT) { /* XXX */
|
|
quad_t sizepb = fs->fs_bsize; /* XXX */
|
|
/* XXX */
|
|
fs->fs_maxfilesize = fs->fs_bsize * NDADDR - 1; /* XXX */
|
|
for (i = 0; i < NIADDR; i++) { /* XXX */
|
|
sizepb *= NINDIR(fs); /* XXX */
|
|
fs->fs_maxfilesize += sizepb; /* XXX */
|
|
} /* XXX */
|
|
fs->fs_qbmask = ~fs->fs_bmask; /* XXX */
|
|
fs->fs_qfmask = ~fs->fs_fmask; /* XXX */
|
|
} /* XXX */
|
|
}
|
|
#endif
|