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btrfs-progs: corrupt-block: add ability to corrupt block group items 

While doing the extent tree v2 stuff I noticed that fsck doesn't detect
an invalid ->used value on the block group item in the normal mode.  To
build a test case for this I need the ability to corrupt block group
items.  This allows us to corrupt the various fields of a block group.

Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Josef Bacik 2021-08-18 00:39:20 -04:00 committed by David Sterba
parent 3875c14a5a
commit 572a0e888a
1 changed files with 107 additions and 1 deletions
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108
btrfs-corrupt-block.c
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@ -348,6 +348,24 @@ enum btrfs_key_field {
BTRFS_KEY_BAD,
};
enum btrfs_block_group_field {
BTRFS_BLOCK_GROUP_ITEM_USED,
BTRFS_BLOCK_GROUP_ITEM_FLAGS,
BTRFS_BLOCK_GROUP_ITEM_CHUNK_OBJECTID,
BTRFS_BLOCK_GROUP_ITEM_BAD,
};
static enum btrfs_block_group_field convert_block_group_field(char *field)
{
if (!strncmp(field, "used", FIELD_BUF_LEN))
return BTRFS_BLOCK_GROUP_ITEM_USED;
if (!strncmp(field, "flags", FIELD_BUF_LEN))
return BTRFS_BLOCK_GROUP_ITEM_FLAGS;
if (!strncmp(field, "chunk_objectid", FIELD_BUF_LEN))
return BTRFS_BLOCK_GROUP_ITEM_CHUNK_OBJECTID;
return BTRFS_BLOCK_GROUP_ITEM_BAD;
}
static enum btrfs_inode_field convert_inode_field(char *field)
{
if (!strncmp(field, "isize", FIELD_BUF_LEN))
@ -442,6 +460,83 @@ static u8 generate_u8(u8 orig)
return ret;
}
static int corrupt_block_group(struct btrfs_root *root, u64 bg, char *field)
{
struct btrfs_trans_handle *trans;
struct btrfs_path *path;
struct btrfs_block_group_item *bgi;
struct btrfs_key key;
enum btrfs_block_group_field corrupt_field;
u64 orig, bogus;
int ret = 0;
root = root->fs_info->extent_root;
corrupt_field = convert_block_group_field(field);
if (corrupt_field == BTRFS_BLOCK_GROUP_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);
}
key.objectid = bg;
key.type = BTRFS_BLOCK_GROUP_ITEM_KEY;
key.offset = 0;
ret = btrfs_search_slot(trans, root, &key, path, 0, 1);
if (ret < 0) {
fprintf(stderr, "Error searching for bg %llu %d\n", bg, ret);
goto out;
}
ret = 0;
btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
if (key.type != BTRFS_BLOCK_GROUP_ITEM_KEY) {
fprintf(stderr, "Couldn't find the bg %llu\n", bg);
goto out;
}
bgi = btrfs_item_ptr(path->nodes[0], path->slots[0],
struct btrfs_block_group_item);
switch (corrupt_field) {
case BTRFS_BLOCK_GROUP_ITEM_USED:
orig = btrfs_block_group_used(path->nodes[0], bgi);
bogus = generate_u64(orig);
btrfs_set_block_group_used(path->nodes[0], bgi, bogus);
break;
case BTRFS_BLOCK_GROUP_ITEM_CHUNK_OBJECTID:
orig = btrfs_block_group_chunk_objectid(path->nodes[0], bgi);
bogus = generate_u64(orig);
btrfs_set_block_group_chunk_objectid(path->nodes[0], bgi,
bogus);
break;
case BTRFS_BLOCK_GROUP_ITEM_FLAGS:
orig = btrfs_block_group_flags(path->nodes[0], bgi);
bogus = generate_u64(orig);
btrfs_set_block_group_flags(path->nodes[0], bgi, bogus);
break;
default:
ret = -EINVAL;
goto out;
}
btrfs_mark_buffer_dirty(path->nodes[0]);
out:
btrfs_commit_transaction(trans, root);
btrfs_free_path(path);
return ret;
}
static int corrupt_key(struct btrfs_root *root, struct btrfs_key *key,
char *field)
{
@ -1150,6 +1245,7 @@ int main(int argc, char **argv)
u64 file_extent = (u64)-1;
u64 root_objectid = 0;
u64 csum_bytenr = 0;
u64 block_group = 0;
char field[FIELD_BUF_LEN];
field[0] = '\0';
@ -1177,11 +1273,12 @@ int main(int argc, char **argv)
{ "delete", no_argument, NULL, 'd'},
{ "root", no_argument, NULL, 'r'},
{ "csum", required_argument, NULL, 'C'},
{ "block-group", required_argument, NULL, 'B'},
{ "help", no_argument, NULL, GETOPT_VAL_HELP},
{ NULL, 0, NULL, 0 }
};
c = getopt_long(argc, argv, "l:c:b:eEkuUi:f:x:m:K:I:D:d:r:C:",
c = getopt_long(argc, argv, "l:c:b:eEkuUi:f:x:m:K:I:D:d:r:C:B:",
long_options, NULL);
if (c < 0)
break;
@ -1244,6 +1341,9 @@ int main(int argc, char **argv)
case 'C':
csum_bytenr = arg_strtou64(optarg);
break;
case 'B':
block_group = arg_strtou64(optarg);
break;
case GETOPT_VAL_HELP:
default:
print_usage(c != GETOPT_VAL_HELP);
@ -1385,6 +1485,12 @@ int main(int argc, char **argv)
ret = corrupt_key(target_root, &key, field);
goto out_close;
}
if (block_group) {
if (*field == 0)
print_usage(1);
ret = corrupt_block_group(root, block_group, field);
goto out_close;
}
/*
* If we made it here and we have extent set then we didn't specify
* inode and we're screwed.