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/******************************************************************************
*******************************************************************************
**
** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
** Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved.
**
** This copyrighted material is made available to anyone wishing to use,
** modify, copy, or redistribute it subject to the terms and conditions
** of the GNU General Public License v.2.
**
*******************************************************************************
******************************************************************************/
#include <unistd.h>
#include <inttypes.h>
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include "osi_list.h"
#include "bio.h"
#include "util.h"
#include "file.h"
#include "rgrp.h"
#include "fsck.h"
#include "fs_inode.h"
#include "ondisk.h"
#include "super.h"
#include "fsck_incore.h"
/**
* check_sb - Check superblock
* @sdp: the filesystem
* @sb: The superblock
*
* Checks the version code of the FS is one that we understand how to
* read and that the sizes of the various on-disk structures have not
* changed.
*
* Returns: 0 on success, -1 on failure
*/
static int check_sb(struct fsck_sb *sdp, struct gfs2_sb *sb)
{
int error = 0;
if (sb->sb_header.mh_magic != GFS2_MAGIC ||
sb->sb_header.mh_type != GFS2_METATYPE_SB){
log_crit("Either the super block is corrupted, or this "
"is not a GFS2 filesystem\n");
log_debug("Header magic: %X Header Type: %X\n",
sb->sb_header.mh_magic,
sb->sb_header.mh_type);
error = -EINVAL;
goto out;
}
/* If format numbers match exactly, we're done. */
if (sb->sb_fs_format != GFS2_FORMAT_FS ||
sb->sb_multihost_format != GFS2_FORMAT_MULTI){
log_warn("Old file system detected.\n");
}
out:
return error;
}
/*
* read_sb: read the super block from disk
* sdp: in-core super block
*
* This function reads in the super block from disk and
* initializes various constants maintained in the super
* block
*
* Returns: 0 on success, -1 on failure.
*/
int read_sb(struct fsck_sb *sdp)
{
struct buffer_head *bh;
uint64_t space = 0;
unsigned int x;
int error;
error = get_and_read_buf(sdp, GFS2_SB_ADDR >> sdp->fsb2bb_shift,
&bh, 0);
if (error){
log_crit("Unable to read superblock\n");
goto out;
}
gfs2_sb_in(&sdp->sb, BH_DATA(bh));
relse_buf(sdp, bh);
error = check_sb(sdp, &sdp->sb);
if (error)
goto out;
/* FIXME: Need to verify all this */
/* FIXME: What's this 9? */
sdp->fsb2bb_shift = sdp->sb.sb_bsize_shift - 9;
sdp->diptrs =
(sdp->sb.sb_bsize-sizeof(struct gfs2_dinode)) /
sizeof(uint64_t);
sdp->inptrs =
(sdp->sb.sb_bsize-sizeof(struct gfs2_meta_header)) /
sizeof(uint64_t);
sdp->jbsize = sdp->sb.sb_bsize - sizeof(struct gfs2_meta_header);
sdp->bsize = sdp->sb.sb_bsize;
/* FIXME: Why is this /2 */
sdp->hash_bsize = sdp->sb.sb_bsize / 2;
sdp->hash_ptrs = sdp->hash_bsize / sizeof(uint64_t);
sdp->heightsize[0] = sdp->sb.sb_bsize -
sizeof(struct gfs2_dinode);
sdp->heightsize[1] = sdp->sb.sb_bsize * sdp->diptrs;
for (x = 2; ; x++){
space = sdp->heightsize[x - 1] * sdp->inptrs;
/* FIXME: Do we really need this first check?? */
if (space / sdp->inptrs != sdp->heightsize[x - 1] ||
space % sdp->inptrs != 0)
break;
sdp->heightsize[x] = space;
}
sdp->max_height = x;
if(sdp->max_height > GFS2_MAX_META_HEIGHT){
log_err("Bad max metadata height.\n");
error = -1;
goto out;
}
sdp->jheightsize[0] = sdp->sb.sb_bsize -
sizeof(struct gfs2_dinode);
sdp->jheightsize[1] = sdp->jbsize * sdp->diptrs;
for (x = 2; ; x++){
space = sdp->jheightsize[x - 1] * sdp->inptrs;
if (space / sdp->inptrs != sdp->jheightsize[x - 1] ||
space % sdp->inptrs != 0)
break;
sdp->jheightsize[x] = space;
}
sdp->max_jheight = x;
if(sdp->max_jheight > GFS2_MAX_META_HEIGHT){
log_err("Bad max jheight.\n");
error = -1;
}
out:
return error;
}
#define JOURNAL_NAME_SIZE 16
/*
* ji_update - fill in journal info
* sdp: the incore superblock pointer
*
* Given the inode for the journal index, read in all
* the journal inodes.
*
* Returns: 0 on success, -1 on failure
*/
int ji_update(struct fsck_sb *sdp)
{
struct fsck_inode *jip, *ip = sdp->md.jiinode;
char journal_name[JOURNAL_NAME_SIZE];
int i;
if(!ip) {
log_err("Journal index inode not filled in\n");
return -1;
}
if(!(sdp->md.journal = calloc(ip->i_di.di_entries - 2, sizeof(struct fsck_inode *)))) {
log_err("Unable to allocate journal inodes\n");
return -1;
}
sdp->md.journals = 0;
memset(journal_name, 0, sizeof(*journal_name));
for(i = 0; i < ip->i_di.di_entries - 2; i++) {
/* FIXME check snprintf return code */
snprintf(journal_name, JOURNAL_NAME_SIZE, "journal%u", i);
fs_lookupi(sdp->md.jiinode,
&(osi_filename_t){journal_name,
strlen(journal_name)}, &jip);
sdp->md.journal[i] = jip;
}
sdp->md.journals = ip->i_di.di_entries - 2;
return 0;
}
/**
* ri_update - attach rgrps to the super block
* @sdp:
*
* Given the rgrp index inode, link in all rgrps into the super block
* and be sure that they can be read.
*
* Returns: 0 on success, -1 on failure.
*/
int ri_update(struct fsck_sb *sdp)
{
struct fsck_rgrp *rgd;
osi_list_t *tmp;
struct gfs2_rindex buf;
unsigned int rg;
int error, count1 = 0, count2 = 0;
for (rg = 0; ; rg++)
{
error = readi(sdp->md.riinode, (char *)&buf,
rg * sizeof(struct gfs2_rindex),
sizeof(struct gfs2_rindex));
if (!error)
break;
if (error != sizeof(struct gfs2_rindex)){
log_err("Unable to read resource group index #%u.\n",
rg);
goto fail;
}
rgd = (struct fsck_rgrp *)malloc(sizeof(struct fsck_rgrp));
rgd->rd_sbd = sdp;
osi_list_add_prev(&rgd->rd_list, &sdp->rglist);
gfs2_rindex_in(&rgd->rd_ri, (char *)&buf);
if(fs_compute_bitstructs(rgd)){
goto fail;
}
rgd->rd_open_count = 0;
count1++;
}
log_debug("%u resource groups found.\n", rg);
for (tmp = sdp->rglist.next; tmp != &sdp->rglist; tmp = tmp->next)
{
rgd = osi_list_entry(tmp, struct fsck_rgrp, rd_list);
error = fs_rgrp_read(rgd);
if (error){
log_err("Unable to read in rgrp descriptor.\n");
goto fail;
}
fs_rgrp_relse(rgd);
count2++;
}
if (count1 != count2){
log_err("Rgrps allocated (%d) does not equal"
" rgrps read (%d).\n", count1, count2);
goto fail;
}
sdp->rgcount = count1;
return 0;
fail:
while(!osi_list_empty(&sdp->rglist)){
rgd = osi_list_entry(sdp->rglist.next, struct fsck_rgrp, rd_list);
if(rgd->rd_bits)
free(rgd->rd_bits);
if(rgd->rd_bh)
free(rgd->rd_bh);
osi_list_del(&rgd->rd_list);
free(rgd);
}
return -1;
}
int write_sb(struct fsck_sb *sbp)
{
int error = 0;
struct buffer_head *bh;
error = get_and_read_buf(sbp, GFS2_SB_ADDR >> sbp->fsb2bb_shift,
&bh, 0);
if (error){
log_crit("Unable to read superblock\n");
goto out;
}
gfs2_sb_out(&sbp->sb, BH_DATA(bh));
/* FIXME: Should this set the BW_WAIT flag? */
if((error = write_buf(sbp, bh, 0))) {
stack;
goto out;
}
relse_buf(sbp, bh);
out:
return error;
}

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