125 lines
3.2 KiB
C
125 lines
3.2 KiB
C
/*
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* Copyright (c) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2009, 2013
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* The President and Fellows of Harvard College.
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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. 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 UNIVERSITY 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 UNIVERSITY 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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#include <sys/types.h> /* for CHAR_BIT */
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#include <limits.h> /* also for CHAR_BIT */
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#include <stdint.h>
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#include <assert.h>
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#include <err.h>
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#include "compat.h"
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#include <kern/sfs.h>
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#include "utils.h"
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#include "sfs.h"
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#include "sb.h"
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#include "freemap.h"
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#include "main.h"
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static struct sfs_superblock sb;
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/*
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* Load the superblock.
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*/
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void
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sb_load(void)
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{
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sfs_readsb(SFS_SUPER_BLOCK, &sb);
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if (sb.sb_magic != SFS_MAGIC) {
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errx(EXIT_FATAL, "Not an sfs filesystem");
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}
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assert(sb.sb_nblocks > 0);
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assert(SFS_FREEMAPBLOCKS(sb.sb_nblocks) > 0);
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}
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/*
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* Validate the superblock.
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*/
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void
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sb_check(void)
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{
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int schanged=0;
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/*
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* FUTURE: should we check sb.sb_nblocks against diskblocks()?
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*/
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/* Check the superblock fields */
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if (checknullstring(sb.sb_volname, sizeof(sb.sb_volname))) {
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warnx("Volume name not null-terminated (fixed)");
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setbadness(EXIT_RECOV);
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schanged = 1;
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}
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if (checkbadstring(sb.sb_volname)) {
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warnx("Volume name contains illegal characters (fixed)");
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setbadness(EXIT_RECOV);
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schanged = 1;
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}
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if (checkzeroed(sb.reserved, sizeof(sb.reserved))) {
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warnx("Reserved section of superblock not zeroed (fixed)");
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setbadness(EXIT_RECOV);
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schanged = 1;
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}
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/* Write the superblock back if necessary */
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if (schanged) {
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sfs_writesb(SFS_SUPER_BLOCK, &sb);
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}
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}
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/*
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* Return the total number of blocks in the volume.
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*/
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uint32_t
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sb_totalblocks(void)
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{
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return sb.sb_nblocks;
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}
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/*
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* Return the number of freemap blocks.
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* (this function probably ought to go away)
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*/
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uint32_t
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sb_freemapblocks(void)
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{
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return SFS_FREEMAPBLOCKS(sb.sb_nblocks);
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}
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/*
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* Return the volume name.
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*/
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const char *
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sb_volname(void)
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{
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return sb.sb_volname;
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}
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