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btrfs-progs: corrupt btrfs items in btrfs-corrup-block 

For testing fsck against completely broken btrfs_items.

Signed-off-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: David Sterba <dsterba@suse.cz>
This commit is contained in:
Josef Bacik 2014-10-02 15:12:20 -04:00 committed by David Sterba
parent 912014bcb2
commit 3e944ce894
1 changed files with 87 additions and 1 deletions
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88
btrfs-corrupt-block.c
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@ -108,6 +108,8 @@ static void print_usage(void)
fprintf(stderr, "\t-K The key to corrupt in the format "
"<num>,<num>,<num> (must also specify -f for the field)\n");
fprintf(stderr, "\t-f The field in the item to corrupt\n");
fprintf(stderr, "\t-I An item to corrupt (must also specify the field "
"to corrupt and a root+key for the item)\n");
fprintf(stderr, "\t-D Corrupt a dir item, must specify key and field\n");
exit(1);
}
@ -313,6 +315,11 @@ enum btrfs_metadata_block_field {
BTRFS_METADATA_BLOCK_BAD,
};
enum btrfs_item_field {
BTRFS_ITEM_OFFSET,
BTRFS_ITEM_BAD,
};
enum btrfs_key_field {
BTRFS_KEY_OBJECTID,
BTRFS_KEY_TYPE,
@ -353,6 +360,13 @@ static enum btrfs_key_field convert_key_field(char *field)
return BTRFS_KEY_BAD;
}
static enum btrfs_item_field convert_item_field(char *field)
{
if (!strncmp(field, "offset", FIELD_BUF_LEN))
return BTRFS_ITEM_OFFSET;
return BTRFS_ITEM_BAD;
}
static enum btrfs_dir_item_field convert_dir_item_field(char *field)
{
if (!strncmp(field, "name", FIELD_BUF_LEN))
@ -371,6 +385,15 @@ static u64 generate_u64(u64 orig)
return ret;
}
static u32 generate_u32(u32 orig)
{
u32 ret;
do {
ret = rand();
} while (ret == orig);
return ret;
}
static u8 generate_u8(u8 orig)
{
u8 ret;
@ -709,6 +732,58 @@ out:
return ret;
}
static int corrupt_btrfs_item(struct btrfs_root *root, struct btrfs_key *key,
char *field)
{
struct btrfs_trans_handle *trans;
struct btrfs_path *path;
enum btrfs_item_field corrupt_field;
u32 orig, bogus;
int ret;
corrupt_field = convert_item_field(field);
if (corrupt_field == BTRFS_ITEM_BAD) {
fprintf(stderr, "Invalid field %s\n", field);
return -EINVAL;
}
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
trans = btrfs_start_transaction(root, 1);
if (IS_ERR(trans)) {
btrfs_free_path(path);
fprintf(stderr, "Couldn't start transaction %ld\n",
PTR_ERR(trans));
return PTR_ERR(trans);
}
ret = btrfs_search_slot(trans, root, key, path, 0, 1);
if (ret != 0) {
fprintf(stderr, "Error searching to node %d\n", ret);
goto out;
}
ret = 0;
switch (corrupt_field) {
case BTRFS_ITEM_OFFSET:
orig = btrfs_item_offset_nr(path->nodes[0], path->slots[0]);
bogus = generate_u32(orig);
btrfs_set_item_offset(path->nodes[0],
btrfs_item_nr(path->slots[0]), bogus);
break;
default:
ret = -EINVAL;
break;
}
btrfs_mark_buffer_dirty(path->nodes[0]);
out:
btrfs_commit_transaction(trans, root);
btrfs_free_path(path);
return ret;
}
static struct option long_options[] = {
/* { "byte-count", 1, NULL, 'b' }, */
{ "logical", 1, NULL, 'l' },
@ -724,6 +799,7 @@ static struct option long_options[] = {
{ "metadata-block", 1, NULL, 'm'},
{ "field", 1, NULL, 'f'},
{ "key", 1, NULL, 'K'},
{ "item", 0, NULL, 'I'},
{ "dir-item", 0, NULL, 'D'},
{ 0, 0, 0, 0}
};
@ -888,6 +964,7 @@ int main(int ac, char **av)
int corrupt_block_keys = 0;
int chunk_rec = 0;
int chunk_tree = 0;
int corrupt_item = 0;
int corrupt_di = 0;
u64 metadata_block = 0;
u64 inode = 0;
@ -900,7 +977,7 @@ int main(int ac, char **av)
while(1) {
int c;
c = getopt_long(ac, av, "l:c:b:eEkuUi:f:x:m:K:D", long_options,
c = getopt_long(ac, av, "l:c:b:eEkuUi:f:x:m:K:ID", long_options,
&option_index);
if (c < 0)
break;
@ -954,6 +1031,9 @@ int main(int ac, char **av)
case 'D':
corrupt_di = 1;
break;
case 'I':
corrupt_item = 1;
break;
default:
print_usage();
}
@ -1056,6 +1136,12 @@ int main(int ac, char **av)
ret = corrupt_dir_item(root, &key, field);
goto out_close;
}
if (corrupt_item) {
if (!key.objectid)
print_usage();
ret = corrupt_btrfs_item(root, &key, field);
goto out_close;
}
if (key.objectid || key.offset || key.type) {
if (!strlen(field))
print_usage();