Josef Bacik
2014-Oct-02 19:12 UTC
[PATCH] 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>
---
btrfs-corrupt-block.c | 90 +++++++++++++++++++++++++++++++++++++++++++++++++--
1 file changed, 88 insertions(+), 2 deletions(-)
diff --git a/btrfs-corrupt-block.c b/btrfs-corrupt-block.c
index 278a56f..c58f01a 100644
--- a/btrfs-corrupt-block.c
+++ b/btrfs-corrupt-block.c
@@ -109,6 +109,8 @@ static void print_usage(void)
"<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 Delete this item (must specify -K)\n");
+ fprintf(stderr, "\t-I An item to corrupt (must also specify the field
"
+ "to corrupt and a root+key for the item)\n");
exit(1);
}
@@ -308,6 +310,11 @@ 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,
@@ -350,6 +357,13 @@ 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 u64 generate_u64(u64 orig)
{
u64 ret;
@@ -359,6 +373,15 @@ 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;
@@ -679,6 +702,58 @@ 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' },
@@ -695,6 +770,7 @@ static struct option long_options[] = {
{ "field", 1, NULL, 'f'},
{ "key", 1, NULL, 'K'},
{ "delete", 0, NULL, 'd'},
+ { "item", 0, NULL, 'I'},
{ 0, 0, 0, 0}
};
@@ -859,6 +935,7 @@ int main(int ac, char **av)
int chunk_rec = 0;
int chunk_tree = 0;
int delete = 0;
+ int corrupt_item = 0;
u64 metadata_block = 0;
u64 inode = 0;
u64 file_extent = (u64)-1;
@@ -870,8 +947,8 @@ 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,
- &option_index);
+ c = getopt_long(ac, av, "l:c:b:eEkuUi:f:x:m:K:dI",
+ long_options, &option_index);
if (c < 0)
break;
switch(c) {
@@ -924,6 +1001,9 @@ int main(int ac, char **av)
case 'd':
delete = 1;
break;
+ case 'I':
+ corrupt_item = 1;
+ break;
default:
print_usage();
}
@@ -1026,6 +1106,12 @@ int main(int ac, char **av)
ret = delete_item(root, &key);
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();
--
1.8.3.1
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