#include "list.h"
#include "version.h"
-/* we write the mirror info to stdout unless they are dumping the data
- * to stdout
- * */
-static FILE *info_file;
-
struct extent_buffer *debug_corrupt_block(struct btrfs_root *root, u64 bytenr,
u32 blocksize, int copy)
{
length = blocksize;
while (1) {
ret = btrfs_map_block(&root->fs_info->mapping_tree, READ,
- eb->start, &length, &multi, mirror_num);
+ eb->start, &length, &multi,
+ mirror_num, NULL);
BUG_ON(ret);
device = multi->stripes[0].dev;
eb->fd = device->fd;
device->total_ios++;
eb->dev_bytenr = multi->stripes[0].physical;
- fprintf(info_file, "mirror %d logical %Lu physical %Lu "
+ fprintf(stdout, "mirror %d logical %Lu physical %Lu "
"device %s\n", mirror_num, (unsigned long long)bytenr,
(unsigned long long)eb->dev_bytenr, device->name);
kfree(multi);
if (!copy || mirror_num == copy) {
- ret = read_extent_from_disk(eb);
+ ret = read_extent_from_disk(eb, 0, eb->len);
printf("corrupting %llu copy %d\n", eb->start,
mirror_num);
memset(eb->data, 0, eb->len);
static void print_usage(void)
{
- fprintf(stderr, "usage: btrfs-map-logical [options] mount_point\n");
- fprintf(stderr, "\t-l Logical extent to map\n");
- fprintf(stderr, "\t-c Copy of the extent to read (usually 1 or 2)\n");
- fprintf(stderr, "\t-o Output file to hold the extent\n");
- fprintf(stderr, "\t-b Number of bytes to read\n");
+ fprintf(stderr, "usage: btrfs-corrupt-block [options] device\n");
+ fprintf(stderr, "\t-l Logical extent to be corrupted\n");
+ fprintf(stderr, "\t-c Copy of the extent to be corrupted"
+ " (usually 1 or 2, default: 0)\n");
+ fprintf(stderr, "\t-b Number of bytes to be corrupted\n");
+ fprintf(stderr, "\t-e Extent to be corrupted\n");
+ fprintf(stderr, "\t-E The whole extent free to be corrupted\n");
exit(1);
}
+static void corrupt_keys(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct extent_buffer *eb)
+{
+ int slot;
+ int bad_slot;
+ int nr;
+ struct btrfs_disk_key bad_key;;
+
+ nr = btrfs_header_nritems(eb);
+ if (nr == 0)
+ return;
+
+ slot = rand() % nr;
+ bad_slot = rand() % nr;
+
+ if (bad_slot == slot)
+ return;
+
+ fprintf(stderr, "corrupting keys in block %llu slot %d swapping with %d\n",
+ (unsigned long long)eb->start, slot, bad_slot);
+
+ if (btrfs_header_level(eb) == 0) {
+ btrfs_item_key(eb, &bad_key, bad_slot);
+ btrfs_set_item_key(eb, &bad_key, slot);
+ } else {
+ btrfs_node_key(eb, &bad_key, bad_slot);
+ btrfs_set_node_key(eb, &bad_key, slot);
+ }
+ btrfs_mark_buffer_dirty(eb);
+ if (!trans) {
+ csum_tree_block(root, eb, 0);
+ write_extent_to_disk(eb);
+ }
+}
+
+
+static int corrupt_keys_in_block(struct btrfs_root *root, u64 bytenr)
+{
+ struct extent_buffer *eb;
+
+ eb = read_tree_block(root, bytenr, root->leafsize, 0);
+ if (!eb)
+ return -EIO;;
+
+ corrupt_keys(NULL, root, eb);
+ free_extent_buffer(eb);
+ return 0;
+}
+
+static int corrupt_extent(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root, u64 bytenr, int copy)
+{
+ struct btrfs_key key;
+ struct extent_buffer *leaf;
+ u32 item_size;
+ unsigned long ptr;
+ struct btrfs_path *path;
+ int ret;
+ int slot;
+ int should_del = rand() % 3;
+
+ path = btrfs_alloc_path();
+
+ key.objectid = bytenr;
+ key.type = (u8)-1;
+ key.offset = (u64)-1;
+
+ while(1) {
+ ret = btrfs_search_slot(trans, root->fs_info->extent_root,
+ &key, path, -1, 1);
+ if (ret < 0)
+ break;
+
+ if (ret > 0) {
+ if (path->slots[0] == 0)
+ break;
+ path->slots[0]--;
+ ret = 0;
+ }
+ leaf = path->nodes[0];
+ slot = path->slots[0];
+ btrfs_item_key_to_cpu(leaf, &key, slot);
+ if (key.objectid != bytenr)
+ break;
+
+ if (key.type != BTRFS_EXTENT_ITEM_KEY &&
+ key.type != BTRFS_TREE_BLOCK_REF_KEY &&
+ key.type != BTRFS_EXTENT_DATA_REF_KEY &&
+ key.type != BTRFS_EXTENT_REF_V0_KEY &&
+ key.type != BTRFS_SHARED_BLOCK_REF_KEY &&
+ key.type != BTRFS_SHARED_DATA_REF_KEY)
+ goto next;
+
+ if (should_del) {
+ fprintf(stderr, "deleting extent record: key %Lu %u %Lu\n",
+ key.objectid, key.type, key.offset);
+
+ if (key.type == BTRFS_EXTENT_ITEM_KEY) {
+ /* make sure this extent doesn't get
+ * reused for other purposes */
+ btrfs_pin_extent(root->fs_info,
+ key.objectid, key.offset);
+ }
+
+ btrfs_del_item(trans, root, path);
+ } else {
+ fprintf(stderr, "corrupting extent record: key %Lu %u %Lu\n",
+ key.objectid, key.type, key.offset);
+ ptr = btrfs_item_ptr_offset(leaf, slot);
+ item_size = btrfs_item_size_nr(leaf, slot);
+ memset_extent_buffer(leaf, 0, ptr, item_size);
+ btrfs_mark_buffer_dirty(leaf);
+ }
+next:
+ btrfs_release_path(NULL, path);
+
+ if (key.offset > 0)
+ key.offset--;
+ if (key.offset == 0)
+ break;
+ }
+
+ btrfs_free_path(path);
+ return 0;
+}
+
+static void btrfs_corrupt_extent_leaf(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root, struct extent_buffer *eb)
+{
+ u32 nr = btrfs_header_nritems(eb);
+ u32 victim = rand() % nr;
+ u64 objectid;
+ struct btrfs_key key;
+
+ btrfs_item_key_to_cpu(eb, &key, victim);
+ objectid = key.objectid;
+ corrupt_extent(trans, root, objectid, 1);
+}
+
+static void btrfs_corrupt_extent_tree(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root, struct extent_buffer *eb)
+{
+ int i;
+ u32 nr;
+
+ if (!eb)
+ return;
+
+ nr = btrfs_header_nritems(eb);
+ if (btrfs_is_leaf(eb)) {
+ btrfs_corrupt_extent_leaf(trans, root, eb);
+ return;
+ }
+
+ if (btrfs_header_level(eb) == 1 && eb != root->node) {
+ if (rand() % 5)
+ return;
+ }
+
+ for (i = 0; i < nr; i++) {
+ struct extent_buffer *next;
+
+ next = read_tree_block(root, btrfs_node_blockptr(eb, i),
+ root->leafsize, btrfs_node_ptr_generation(eb, i));
+ if (!next)
+ continue;
+ btrfs_corrupt_extent_tree(trans, root, next);
+ free_extent_buffer(next);
+ }
+}
+
static struct option long_options[] = {
/* { "byte-count", 1, NULL, 'b' }, */
{ "logical", 1, NULL, 'l' },
{ "copy", 1, NULL, 'c' },
{ "bytes", 1, NULL, 'b' },
+ { "extent-record", 0, NULL, 'e' },
+ { "extent-tree", 0, NULL, 'E' },
+ { "keys", 0, NULL, 'k' },
{ 0, 0, 0, 0}
};
+
int main(int ac, char **av)
{
struct cache_tree root_cache;
struct btrfs_root *root;
struct extent_buffer *eb;
char *dev;
- char *output_file = NULL;
u64 logical = 0;
int ret = 0;
int option_index = 0;
int copy = 0;
u64 bytes = 4096;
- int out_fd = 0;
- int err;
+ int extent_rec = 0;
+ int extent_tree = 0;
+ int corrupt_block_keys = 0;
+
+ srand(128);
while(1) {
int c;
- c = getopt_long(ac, av, "l:c:", long_options,
+ c = getopt_long(ac, av, "l:c:b:eEk", long_options,
&option_index);
if (c < 0)
break;
print_usage();
}
break;
+ case 'e':
+ extent_rec = 1;
+ break;
+ case 'E':
+ extent_tree = 1;
+ break;
+ case 'k':
+ corrupt_block_keys = 1;
+ break;
default:
print_usage();
}
ac = ac - optind;
if (ac == 0)
print_usage();
- if (logical == 0)
+ if (logical == 0 && !extent_tree)
print_usage();
if (copy < 0)
print_usage();
fprintf(stderr, "Open ctree failed\n");
exit(1);
}
-
- info_file = stdout;
- if (output_file) {
- if (strcmp(output_file, "-") == 0) {
- out_fd = 1;
- info_file = stderr;
- } else {
- out_fd = open(output_file, O_RDWR | O_CREAT, 0600);
- if (out_fd < 0)
- goto close;
- err = ftruncate(out_fd, 0);
- if (err) {
- close(out_fd);
- goto close;
- }
- info_file = stdout;
- }
+ if (extent_rec) {
+ struct btrfs_trans_handle *trans;
+ trans = btrfs_start_transaction(root, 1);
+ ret = corrupt_extent (trans, root, logical, 0);
+ btrfs_commit_transaction(trans, root);
+ goto out_close;
+ }
+ if (extent_tree) {
+ struct btrfs_trans_handle *trans;
+ trans = btrfs_start_transaction(root, 1);
+ btrfs_corrupt_extent_tree(trans, root->fs_info->extent_root,
+ root->fs_info->extent_root->node);
+ btrfs_commit_transaction(trans, root);
+ goto out_close;
}
if (bytes == 0)
bytes *= root->sectorsize;
while (bytes > 0) {
- eb = debug_corrupt_block(root, logical, root->sectorsize, copy);
- if (eb && output_file) {
- err = write(out_fd, eb->data, eb->len);
- if (err < 0 || err != eb->len) {
- fprintf(stderr, "output file write failed\n");
- goto out_close_fd;
- }
+ if (corrupt_block_keys) {
+ corrupt_keys_in_block(root, logical);
+ } else {
+ eb = debug_corrupt_block(root, logical,
+ root->sectorsize, copy);
+ free_extent_buffer(eb);
}
- free_extent_buffer(eb);
logical += root->sectorsize;
bytes -= root->sectorsize;
}
-
-out_close_fd:
- if (output_file && out_fd != 1)
- close(out_fd);
-close:
+ return ret;
+out_close:
+ close_ctree(root);
return ret;
}
projects / platform / upstream / btrfs-progs.git / blobdiff