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Btrfs-progs: add the ability to delete items 

Somtetimes you just need to delete an item, add that functionality to
btrfs-corrupt-block.  Thanks,

Signed-off-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: David Sterba <dsterba@suse.cz>
master
Josef Bacik 2014-10-31 14:01:19 -04:00 committed by David Sterba
parent 5676e94ad8
commit 183a9d4537
1 changed files with 44 additions and 1 deletions
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45
btrfs-corrupt-block.c
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@ -111,6 +111,7 @@ static void print_usage(void)
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);
}
@ -811,6 +812,39 @@ out:
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' },
@ -828,6 +862,7 @@ static struct option long_options[] = {
{ "key", 1, NULL, 'K'},
{ "item", 0, NULL, 'I'},
{ "dir-item", 0, NULL, 'D'},
{ "delete", 0, NULL, 'd'},
{ 0, 0, 0, 0}
};
@ -993,6 +1028,7 @@ int main(int ac, char **av)
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;
@ -1004,7 +1040,7 @@ int main(int ac, char **av)
while(1) {
int c;
c = getopt_long(ac, av, "l:c:b:eEkuUi:f:x:m:K:ID", long_options,
c = getopt_long(ac, av, "l:c:b:eEkuUi:f:x:m:K:IDd", long_options,
&option_index);
if (c < 0)
break;
@ -1060,6 +1096,8 @@ int main(int ac, char **av)
break;
case 'I':
corrupt_item = 1;
case 'd':
delete = 1;
break;
default:
print_usage();
@ -1167,6 +1205,11 @@ int main(int ac, char **av)
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) {