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Btrfs-progs: corrupt-block: add the ability to remove csums 

Sometimes we need to test what happens when we're missing a csum for a range, so
add an option to btrfs-corrupt-block to be able to remove a csum range.  Thanks,

Signed-off-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: David Sterba <dsterba@suse.cz>
master
Josef Bacik 2015-05-19 10:21:04 -04:00 committed by David Sterba
parent 5d4f3ea9b4
commit af3b243358
1 changed files with 33 additions and 1 deletions
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34
btrfs-corrupt-block.c
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@ -110,6 +110,9 @@ static void print_usage(void)
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");
fprintf(stderr, "\t-r Operate on this root (only works with -d)\n");
fprintf(stderr, "\t-C Delete a csum for the specified bytenr. When "
"used with -b it'll delete that many bytes, otherwise it's "
"just sectorsize\n");
exit(1);
}
@ -843,6 +846,26 @@ out:
return ret;
}
static int delete_csum(struct btrfs_root *root, u64 bytenr, u64 bytes)
{
struct btrfs_trans_handle *trans;
int ret;
root = root->fs_info->csum_root;
trans = btrfs_start_transaction(root, 1);
if (IS_ERR(trans)) {
fprintf(stderr, "Couldn't start transaction %ld\n",
PTR_ERR(trans));
return PTR_ERR(trans);
}
ret = btrfs_del_csums(trans, root, bytenr, bytes);
if (ret)
fprintf(stderr, "Error deleting csums %d\n", ret);
btrfs_commit_transaction(trans, root);
return ret;
}
/* corrupt item using NO cow.
* Because chunk recover will recover based on whole partition scaning,
* If using COW, chunk recover will use the old item to recover,
@ -1009,6 +1032,7 @@ int main(int ac, char **av)
u64 inode = 0;
u64 file_extent = (u64)-1;
u64 root_objectid = 0;
u64 csum_bytenr = 0;
char field[FIELD_BUF_LEN];
field[0] = '\0';
@ -1036,10 +1060,11 @@ int main(int ac, char **av)
{ "dir-item", no_argument, NULL, 'D'},
{ "delete", no_argument, NULL, 'd'},
{ "root", no_argument, NULL, 'r'},
{ "csum", required_argument, NULL, 'C'},
{ NULL, 0, NULL, 0 }
};
c = getopt_long(ac, av, "l:c:b:eEkuUi:f:x:m:K:IDdr:",
c = getopt_long(ac, av, "l:c:b:eEkuUi:f:x:m:K:IDdr:C:",
long_options, NULL);
if (c < 0)
break;
@ -1103,6 +1128,9 @@ int main(int ac, char **av)
case 'r':
root_objectid = arg_strtou64(optarg);
break;
case 'C':
csum_bytenr = arg_strtou64(optarg);
break;
default:
print_usage();
}
@ -1205,6 +1233,10 @@ int main(int ac, char **av)
ret = corrupt_dir_item(root, &key, field);
goto out_close;
}
if (csum_bytenr) {
ret = delete_csum(root, csum_bytenr, bytes);
goto out_close;
}
if (corrupt_item) {
if (!key.objectid)
print_usage();