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Btrfs-progs: add ability to corrupt dir items 

In order to test the dir index corruption fixing patches in fsck we need to add
functionality to btrfs-corrupt-block to corrupt dir item fields.  Thanks,

Signed-off-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: David Sterba <dsterba@suse.cz>
master
Josef Bacik 2014-10-10 16:57:16 -04:00 committed by David Sterba
parent c2e686d76a
commit 912014bcb2
1 changed files with 102 additions and 1 deletions
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103
btrfs-corrupt-block.c
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@ -108,6 +108,7 @@ 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-D Corrupt a dir item, must specify key and field\n");
exit(1);
}
@ -301,6 +302,12 @@ enum btrfs_file_extent_field {
BTRFS_FILE_EXTENT_BAD,
};
enum btrfs_dir_item_field {
BTRFS_DIR_ITEM_NAME,
BTRFS_DIR_ITEM_LOCATION_OBJECTID,
BTRFS_DIR_ITEM_BAD,
};
enum btrfs_metadata_block_field {
BTRFS_METADATA_BLOCK_GENERATION,
BTRFS_METADATA_BLOCK_BAD,
@ -346,6 +353,15 @@ static enum btrfs_key_field convert_key_field(char *field)
return BTRFS_KEY_BAD;
}
static enum btrfs_dir_item_field convert_dir_item_field(char *field)
{
if (!strncmp(field, "name", FIELD_BUF_LEN))
return BTRFS_DIR_ITEM_NAME;
if (!strncmp(field, "location_objectid", FIELD_BUF_LEN))
return BTRFS_DIR_ITEM_LOCATION_OBJECTID;
return BTRFS_DIR_ITEM_BAD;
}
static u64 generate_u64(u64 orig)
{
u64 ret;
@ -421,6 +437,80 @@ out:
return ret;
}
static int corrupt_dir_item(struct btrfs_root *root, struct btrfs_key *key,
char *field)
{
struct btrfs_trans_handle *trans;
struct btrfs_dir_item *di;
struct btrfs_path *path;
char *name;
struct btrfs_key location;
struct btrfs_disk_key disk_key;
unsigned long name_ptr;
enum btrfs_dir_item_field corrupt_field =
convert_dir_item_field(field);
u64 bogus;
u16 name_len;
int ret;
if (corrupt_field == BTRFS_DIR_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);
return PTR_ERR(trans);
}
ret = btrfs_search_slot(trans, root, key, path, 0, 1);
if (ret) {
if (ret > 0)
ret = -ENOENT;
fprintf(stderr, "Error searching for dir item %d\n", ret);
goto out;
}
di = btrfs_item_ptr(path->nodes[0], path->slots[0],
struct btrfs_dir_item);
switch (corrupt_field) {
case BTRFS_DIR_ITEM_NAME:
name_len = btrfs_dir_name_len(path->nodes[0], di);
name = malloc(name_len);
if (!name) {
ret = -ENOMEM;
goto out;
}
name_ptr = (unsigned long)(di + 1);
read_extent_buffer(path->nodes[0], name, name_ptr, name_len);
name[0]++;
write_extent_buffer(path->nodes[0], name, name_ptr, name_len);
btrfs_mark_buffer_dirty(path->nodes[0]);
free(name);
goto out;
case BTRFS_DIR_ITEM_LOCATION_OBJECTID:
btrfs_dir_item_key_to_cpu(path->nodes[0], di, &location);
bogus = generate_u64(location.objectid);
location.objectid = bogus;
btrfs_cpu_key_to_disk(&disk_key, &location);
btrfs_set_dir_item_key(path->nodes[0], di, &disk_key);
btrfs_mark_buffer_dirty(path->nodes[0]);
goto out;
default:
ret = -EINVAL;
goto out;
}
out:
btrfs_commit_transaction(trans, root);
btrfs_free_path(path);
return ret;
}
static int corrupt_inode(struct btrfs_trans_handle *trans,
struct btrfs_root *root, u64 inode, char *field)
@ -634,6 +724,7 @@ static struct option long_options[] = {
{ "metadata-block", 1, NULL, 'm'},
{ "field", 1, NULL, 'f'},
{ "key", 1, NULL, 'K'},
{ "dir-item", 0, NULL, 'D'},
{ 0, 0, 0, 0}
};
@ -797,6 +888,7 @@ int main(int ac, char **av)
int corrupt_block_keys = 0;
int chunk_rec = 0;
int chunk_tree = 0;
int corrupt_di = 0;
u64 metadata_block = 0;
u64 inode = 0;
u64 file_extent = (u64)-1;
@ -808,7 +900,7 @@ int main(int ac, char **av)
while(1) {
int c;
c = getopt_long(ac, av, "l:c:b:eEkuUi:f:x:m:K:", long_options,
c = getopt_long(ac, av, "l:c:b:eEkuUi:f:x:m:K:D", long_options,
&option_index);
if (c < 0)
break;
@ -859,6 +951,9 @@ int main(int ac, char **av)
print_usage();
}
break;
case 'D':
corrupt_di = 1;
break;
default:
print_usage();
}
@ -955,6 +1050,12 @@ int main(int ac, char **av)
ret = corrupt_metadata_block(root, metadata_block, field);
goto out_close;
}
if (corrupt_di) {
if (!key.objectid || !strlen(field))
print_usage();
ret = corrupt_dir_item(root, &key, field);
goto out_close;
}
if (key.objectid || key.offset || key.type) {
if (!strlen(field))
print_usage();