@@ -406,23 +406,27 @@ static void print_usage(void)
fprintf(stderr, "\t-S value\tpositive value will enable seeding, zero to disable, negative is not allowed\n");
fprintf(stderr, "\t-r \t\tenable extended inode refs\n");
fprintf(stderr, "\t-x \t\tenable skinny metadata extent refs\n");
- fprintf(stderr, "\t-f \t\tforce to set or clear flags, make sure that you are aware of the dangers\n");
+ fprintf(stderr, "\t-f \t\tforce to do dangerous operation, make sure that you are aware of the dangers\n");
+ fprintf(stderr, "\t-U [uuid]\t\tchange fsid, if uuid is not given, use a random one\n");
}
int main(int argc, char *argv[])
{
struct btrfs_root *root;
+ enum btrfs_open_ctree_flags ctree_flags = OPEN_CTREE_WRITES;
int success = 0;
int total = 0;
int extrefs_flag = 0;
int seeding_flag = 0;
u64 seeding_value = 0;
int skinny_flag = 0;
+ int random_fsid = 0;
+ char *new_fsid_str = NULL;
int ret;
optind = 1;
while(1) {
- int c = getopt(argc, argv, "S:rxf");
+ int c = getopt(argc, argv, "S:rxfuU:");
if (c < 0)
break;
switch(c) {
@@ -439,6 +443,14 @@ int main(int argc, char *argv[])
case 'f':
force = 1;
break;
+ case 'U':
+ ctree_flags |= OPEN_CTREE_IGNORE_FSID_MISMATCH;
+ new_fsid_str = optarg;
+ break;
+ case 'u':
+ ctree_flags |= OPEN_CTREE_IGNORE_FSID_MISMATCH;
+ random_fsid = 1;
+ break;
default:
print_usage();
return 1;
@@ -453,13 +465,37 @@ int main(int argc, char *argv[])
return 1;
}
- if (!(seeding_flag + extrefs_flag + skinny_flag)) {
+ if (random_fsid && new_fsid_str) {
+ fprintf(stderr,
+ "ERROR: Random fsid can't be used with specified fsid\n");
+ return 1;
+ }
+ if (!(seeding_flag + extrefs_flag + skinny_flag) &&
+ !(random_fsid || new_fsid_str)) {
fprintf(stderr,
"ERROR: At least one option should be assigned.\n");
print_usage();
return 1;
}
+ if (new_fsid_str) {
+ uuid_t tmp;
+
+ ret = uuid_parse(new_fsid_str, tmp);
+ if (ret < 0) {
+ fprintf(stderr,
+ "ERROR: Could not parse UUID: %s\n",
+ new_fsid_str);
+ return 1;
+ }
+ if (!test_uuid_unique(new_fsid_str)) {
+ fprintf(stderr,
+ "ERROR: Fsid %s is not unique\n",
+ new_fsid_str);
+ return 1;
+ }
+ }
+
ret = check_mounted(device);
if (ret < 0) {
fprintf(stderr, "Could not check mount status: %s\n",
@@ -470,7 +506,7 @@ int main(int argc, char *argv[])
return 1;
}
- root = open_ctree(device, 0, OPEN_CTREE_WRITES);
+ root = open_ctree(device, 0, ctree_flags);
if (!root) {
fprintf(stderr, "Open ctree failed\n");
@@ -483,7 +519,8 @@ int main(int argc, char *argv[])
ret = ask_user("We are going to clear the seeding flag, are you sure?");
if (!ret) {
fprintf(stderr, "Clear seeding flag canceled\n");
- return 1;
+ ret = 1;
+ goto out;
}
}
@@ -505,6 +542,25 @@ int main(int argc, char *argv[])
total++;
}
+ if (random_fsid || new_fsid_str) {
+ if (!force) {
+ fprintf(stderr,
+ "Warning: It's highly recommended to run 'btrfs check' before this operation\n");
+ fprintf(stderr,
+ "Also canceling running UUID change progress may cause corruption\n");
+ ret = ask_user("We are going to change UUID, are your sure?");
+ if (!ret) {
+ fprintf(stderr, "UUID change canceled\n");
+ ret = 1;
+ goto out;
+ }
+ }
+ ret = change_uuid(root->fs_info, new_fsid_str);
+ if (!ret)
+ success++;
+ total++;
+ }
+
if (success == total) {
ret = 0;
} else {
@@ -512,6 +568,7 @@ int main(int argc, char *argv[])
ret = 1;
fprintf(stderr, "btrfstune failed\n");
}
+out:
close_ctree(root);
return ret;
Add two options, '-U' and '-u' for btrfstune. For '-u', it is used to change fsid to a random new UUID. For '-U', it is used to change fsid to a specified UUID. Both will also change the internal use only chunk_tree_uuid to a random new UUID. Although there is a GNU getopt extension "::" to get optional option-argument, but is forbidden by POSIX.1-2008, so use split options here. Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com> --- btrfstune.c | 67 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++----- 1 file changed, 62 insertions(+), 5 deletions(-)