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");
+ fprintf(stderr, "\t-d Delete this item (must specify -K)\n");
exit(1);
}
enum btrfs_metadata_block_field {
BTRFS_METADATA_BLOCK_GENERATION,
+ BTRFS_METADATA_BLOCK_SHIFT_ITEMS,
BTRFS_METADATA_BLOCK_BAD,
};
+enum btrfs_item_field {
+ BTRFS_ITEM_OFFSET,
+ BTRFS_ITEM_BAD,
+};
+
enum btrfs_key_field {
BTRFS_KEY_OBJECTID,
BTRFS_KEY_TYPE,
{
if (!strncmp(field, "generation", FIELD_BUF_LEN))
return BTRFS_METADATA_BLOCK_GENERATION;
+ if (!strncmp(field, "shift_items", FIELD_BUF_LEN))
+ return BTRFS_METADATA_BLOCK_SHIFT_ITEMS;
return BTRFS_METADATA_BLOCK_BAD;
}
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))
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;
return ret;
}
+static void shift_items(struct btrfs_root *root, struct extent_buffer *eb)
+{
+ int nritems = btrfs_header_nritems(eb);
+ int shift_space = btrfs_leaf_free_space(root, eb) / 2;
+ int slot = nritems / 2;
+ int i = 0;
+ unsigned int data_end = btrfs_item_offset_nr(eb, nritems - 1);
+
+ /* Shift the item data up to and including slot back by shift space */
+ memmove_extent_buffer(eb, btrfs_leaf_data(eb) + data_end - shift_space,
+ btrfs_leaf_data(eb) + data_end,
+ btrfs_item_offset_nr(eb, slot - 1) - data_end);
+
+ /* Now update the item pointers. */
+ for (i = nritems - 1; i >= slot; i--) {
+ u32 offset = btrfs_item_offset_nr(eb, i);
+ offset -= shift_space;
+ btrfs_set_item_offset(eb, btrfs_item_nr(i), offset);
+ }
+}
+
static int corrupt_metadata_block(struct btrfs_root *root, u64 block,
char *field)
{
bogus = generate_u64(orig);
btrfs_set_header_generation(eb, bogus);
break;
+ case BTRFS_METADATA_BLOCK_SHIFT_ITEMS:
+ shift_items(root, path->nodes[level]);
+ break;
default:
ret = -EINVAL;
break;
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 int delete_item(struct btrfs_root *root, struct btrfs_key *key)
+{
+ struct btrfs_trans_handle *trans;
+ struct btrfs_path *path;
+ int ret;
+
+ 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, -1, 1);
+ if (ret) {
+ if (ret > 0)
+ ret = -ENOENT;
+ fprintf(stderr, "Error searching to node %d\n", ret);
+ goto out;
+ }
+ ret = btrfs_del_item(trans, root, path);
+ 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' },
{ "metadata-block", 1, NULL, 'm'},
{ "field", 1, NULL, 'f'},
{ "key", 1, NULL, 'K'},
+ { "item", 0, NULL, 'I'},
{ "dir-item", 0, NULL, 'D'},
+ { "delete", 0, NULL, 'd'},
{ 0, 0, 0, 0}
};
int corrupt_block_keys = 0;
int chunk_rec = 0;
int chunk_tree = 0;
+ int corrupt_item = 0;
int corrupt_di = 0;
+ int delete = 0;
u64 metadata_block = 0;
u64 inode = 0;
u64 file_extent = (u64)-1;
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:IDd", long_options,
&option_index);
if (c < 0)
break;
case 'D':
corrupt_di = 1;
break;
+ case 'I':
+ corrupt_item = 1;
+ case 'd':
+ delete = 1;
+ break;
default:
print_usage();
}
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);
+ }
+ if (delete) {
+ if (!key.objectid)
+ print_usage();
+ ret = delete_item(root, &key);
+ goto out_close;
+ }
if (key.objectid || key.offset || key.type) {
if (!strlen(field))
print_usage();
projects / platform / upstream / btrfs-progs.git / blobdiff