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/*
* group.c
*
* group descriptor corruptions
*
* Copyright (C) 2006 Oracle. All rights reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public
* License along with this program; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 021110-1307, USA.
*
*/
/* This file will create the following errors for a group descriptor.
*
* Group minor field error: GROUP_PARENT, GROUP_BLKNO, GROUP_CHAIN,
* GROUP_FREE_BITS
*
* Group generation error: GROUP_GEN
*
* Group list error: GROUP_UNEXPECTED_DESC, GROUP_EXPECTED_DESC
*
*/
#include "main.h"
extern char *progname;
static void create_test_group_desc(ocfs2_filesys *fs, uint64_t *newblk,
struct ocfs2_group_desc *clone)
{
errcode_t ret;
uint32_t n_clusters;
char *buf = NULL;
struct ocfs2_group_desc *bg = NULL;
if (!clone)
FSWRK_FATAL("Can't fake the null group descriptor");
ret = ocfs2_new_clusters(fs, 1, 1, newblk, &n_clusters);
if (ret)
FSWRK_COM_FATAL(progname, ret);
ret = ocfs2_malloc_block(fs->fs_io, &buf);
if (ret)
FSWRK_COM_FATAL(progname, ret);
bg = (struct ocfs2_group_desc *)buf;
*bg = *clone;
bg->bg_blkno = cpu_to_le64(*newblk);
bg->bg_next_group = 0;
ret = io_write_block(fs->fs_io, *newblk, 1, buf);
if(ret)
FSWRK_COM_FATAL(progname, ret);
return;
}
static void damage_group_desc(ocfs2_filesys *fs, uint64_t blkno,
enum fsck_type type)
{
errcode_t ret;
char *buf = NULL, *bufgroup = NULL, *bufgroup1 = NULL;
struct ocfs2_dinode *di;
struct ocfs2_chain_list *cl;
struct ocfs2_chain_rec *cr;
struct ocfs2_group_desc *bg = NULL, *bg1 = NULL;
uint64_t newblk;
ret = ocfs2_malloc_block(fs->fs_io, &buf);
if (ret)
FSWRK_COM_FATAL(progname, ret);
ret = ocfs2_read_inode(fs, blkno, buf);
if (ret)
FSWRK_COM_FATAL(progname, ret);
di = (struct ocfs2_dinode *)buf;
if (!(di->i_flags & OCFS2_BITMAP_FL))
FSWRK_FATAL("not a bitmap");
if (!(di->i_flags & OCFS2_CHAIN_FL))
FSWRK_FATAL("not a chain group");
cl = &(di->id2.i_chain);
if (!cl->cl_next_free_rec) {
FSWRK_WARN("No chain record found at inode#%"PRIu64
",so can't corrupt it for type[%d].\n",
blkno, type);
goto bail;
}
ret = ocfs2_malloc_block(fs->fs_io, &bufgroup);
if (ret)
FSWRK_COM_FATAL(progname, ret);
cr = cl->cl_recs;
ret = ocfs2_read_group_desc(fs, cr->c_blkno, bufgroup);
if (ret)
FSWRK_COM_FATAL(progname, ret);
bg = (struct ocfs2_group_desc *)bufgroup;
switch (type) {
case GROUP_EXPECTED_DESC:
fprintf(stdout, "Corrput GROUP_EXPECED_DESC: "
"delete the group desciptor#%"PRIu64" from the chain "
"#%d\n", bg->bg_next_group, bg->bg_chain);
bg->bg_next_group = 0;
break;
case GROUP_UNEXPECTED_DESC:
create_test_group_desc(fs, &newblk, bg);
fprintf(stdout, "Corrput GROUP_UNEXPECED_DESC: "
"Add a fake descriptor#%"PRIu64
" in the chain#%d of inode#%"PRIu64"\n",
newblk, bg->bg_chain, blkno);
bg->bg_next_group = cpu_to_le64(newblk);
break;
case GROUP_GEN:
fprintf(stdout, "Corrput GROUP_GEN: "
"change group generation from %x to %x\n",
bg->bg_generation, (bg->bg_generation + 10));
bg->bg_generation += 10;
/* crash next group correspondingly to verify fsck.ocfs2. */
if (bg->bg_next_group) {
ret = ocfs2_malloc_block(fs->fs_io, &bufgroup1);
if (ret)
FSWRK_COM_FATAL(progname, ret);
ret = ocfs2_read_group_desc(fs, bg->bg_next_group,
bufgroup1);
if (ret)
FSWRK_COM_FATAL(progname, ret);
bg1 = (struct ocfs2_group_desc *)bufgroup1;
bg1->bg_generation += 10;
fprintf(stdout, "Corrput GROUP_GEN: "
"change group generation from %x to %x\n",
bg1->bg_generation, (bg1->bg_generation + 10));
ret = ocfs2_write_group_desc(fs, bg->bg_next_group,
bufgroup1);
if (ret)
FSWRK_COM_FATAL(progname, ret);
}
break;
case GROUP_PARENT:
fprintf(stdout, "Corrput GROUP_PARENT: "
"change group parent from %"PRIu64" to %"PRIu64"\n",
bg->bg_parent_dinode, (bg->bg_parent_dinode + 10));
bg->bg_parent_dinode += 10;
break;
case GROUP_BLKNO:
fprintf(stdout, "Corrput GROUP_BLKNO: "
"change group blkno from %"PRIu64" to %"PRIu64"\n",
bg->bg_blkno, (bg->bg_blkno + 10));
bg->bg_blkno += 10;
break;
case GROUP_CHAIN:
fprintf(stdout, "Corrput GROUP_CHAIN: "
"change group chain from %u to %u\n",
bg->bg_chain, (bg->bg_chain + 10));
bg->bg_chain += 10;
break;
case GROUP_FREE_BITS:
fprintf(stdout, "Corrput GROUP_FREE_BITS: "
"change group free bits from %u to %u\n",
bg->bg_free_bits_count, (bg->bg_bits + 10));
bg->bg_free_bits_count = bg->bg_bits + 10;
break;
default:
FSWRK_FATAL("Invalid type[%d]\n", type);
}
ret = ocfs2_write_group_desc(fs, cr->c_blkno, bufgroup);
if (ret)
FSWRK_COM_FATAL(progname, ret);
ret = ocfs2_write_inode(fs, blkno, buf);
if (ret)
FSWRK_COM_FATAL(progname, ret);
bail:
if(bufgroup1)
ocfs2_free(&bufgroup1);
if (bufgroup)
ocfs2_free(&bufgroup);
if (buf)
ocfs2_free(&buf);
return;
}
static void mess_up_group_desc(ocfs2_filesys *fs, uint16_t slotnum,
enum fsck_type type)
{
errcode_t ret;
char sysfile[OCFS2_MAX_FILENAME_LEN];
uint64_t blkno;
struct ocfs2_super_block *sb = OCFS2_RAW_SB(fs->fs_super);
if (slotnum == UINT16_MAX)
snprintf(sysfile, sizeof(sysfile), "%s",
ocfs2_system_inodes[GLOBAL_BITMAP_SYSTEM_INODE].si_name);
else
snprintf(sysfile, sizeof(sysfile),
ocfs2_system_inodes[INODE_ALLOC_SYSTEM_INODE].si_name,
slotnum);
ret = ocfs2_lookup(fs, sb->s_system_dir_blkno, sysfile,
strlen(sysfile), NULL, &blkno);
if (ret)
FSWRK_COM_FATAL(progname, ret);
damage_group_desc(fs, blkno, type);
return ;
}
void mess_up_group_minor(ocfs2_filesys *fs, enum fsck_type type,
uint16_t slotnum)
{
mess_up_group_desc(fs, slotnum, type);
}
void mess_up_group_gen(ocfs2_filesys *fs, enum fsck_type type, uint16_t slotnum)
{
mess_up_group_desc(fs, slotnum, type);
}
void mess_up_group_list(ocfs2_filesys *fs, enum fsck_type type,
uint16_t slotnum)
{
mess_up_group_desc(fs, slotnum, type);
}
/* We will allocate some clusters and corrupt the group descriptor
* which stores the clusters and makes fsck run into error.
*/
void mess_up_cluster_group_desc(ocfs2_filesys *fs, enum fsck_type type,
uint16_t slotnum)
{
errcode_t ret;
uint32_t found, start_cluster, old_free_bits, request = 100;
uint64_t start_blk;
uint64_t bg_blk;
int cpg;
char *buf = NULL;
struct ocfs2_group_desc *bg;
ret = ocfs2_new_clusters(fs, 1, request, &start_blk, &found);
if (ret)
FSWRK_COM_FATAL(progname, ret);
start_cluster = ocfs2_blocks_to_clusters(fs, start_blk);
cpg = ocfs2_group_bitmap_size(fs->fs_blocksize, 0,
OCFS2_RAW_SB(fs->fs_super)->s_feature_incompat) * 8;
bg_blk = ocfs2_which_cluster_group(fs, cpg, start_cluster);
ret = ocfs2_malloc_block(fs->fs_io, &buf);
if (ret)
FSWRK_COM_FATAL(progname, ret);
ret = ocfs2_read_group_desc(fs, bg_blk, buf);
if (ret)
FSWRK_COM_FATAL(progname, ret);
bg = (struct ocfs2_group_desc *)buf;
old_free_bits = bg->bg_free_bits_count;
bg->bg_free_bits_count = bg->bg_bits + 10;
ret = ocfs2_write_group_desc(fs, bg_blk, buf);
if (ret)
FSWRK_COM_FATAL(progname, ret);
fprintf(stdout, "Corrput CLUSTER and GROUP_FREE_BITS: "
"Allocating %u clusters and change group[%"PRIu64"]'s free bits"
" from %u to %u\n",
found, bg_blk, old_free_bits, bg->bg_free_bits_count);
if (buf)
ocfs2_free(&buf);
}
/*
* Simply corrupt the global bitmap by allocating a new cluster, without
* actually using it later.
*/
void mess_up_cluster_alloc_bits(ocfs2_filesys *fs, enum fsck_type type,
uint16_t slotnum)
{
errcode_t ret;
uint32_t n_clusters;
uint64_t blkno;
ret = ocfs2_new_clusters(fs, 1, 1, &blkno, &n_clusters);
if (ret) {
FSWRK_COM_FATAL(progname, ret);
ocfs2_free_clusters(fs, 1, blkno);
}
fprintf(stdout ,"Mark bits of global bitmap by unused "
"block#%"PRIu64".\n", blkno);
}
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