forked from Mirrors/btrfs-progs
btrfs-progs: btrfstune: add '-U' and '-u' option to change fsid
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> Signed-off-by: David Sterba <dsterba@suse.cz>master
parent
0522713f3c
commit
5fd37009da
68
btrfstune.c
68
btrfstune.c
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@ -406,23 +406,28 @@ static void print_usage(void)
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fprintf(stderr, "\t-S value\tpositive value will enable seeding, zero to disable, negative is not allowed\n");
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fprintf(stderr, "\t-S value\tpositive value will enable seeding, zero to disable, negative is not allowed\n");
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fprintf(stderr, "\t-r \t\tenable extended inode refs\n");
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fprintf(stderr, "\t-r \t\tenable extended inode refs\n");
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fprintf(stderr, "\t-x \t\tenable skinny metadata extent refs\n");
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fprintf(stderr, "\t-x \t\tenable skinny metadata extent refs\n");
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fprintf(stderr, "\t-f \t\tforce to set or clear flags, make sure that you are aware of the dangers\n");
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fprintf(stderr, "\t-f \t\tforce to do dangerous operation, make sure that you are aware of the dangers\n");
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fprintf(stderr, "\t-u \t\tchange fsid, use a random one\n");
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fprintf(stderr, "\t-U UUID\t\tchange fsid to UUID\n");
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}
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}
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int main(int argc, char *argv[])
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int main(int argc, char *argv[])
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{
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{
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struct btrfs_root *root;
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struct btrfs_root *root;
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enum btrfs_open_ctree_flags ctree_flags = OPEN_CTREE_WRITES;
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int success = 0;
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int success = 0;
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int total = 0;
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int total = 0;
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int extrefs_flag = 0;
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int extrefs_flag = 0;
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int seeding_flag = 0;
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int seeding_flag = 0;
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u64 seeding_value = 0;
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u64 seeding_value = 0;
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int skinny_flag = 0;
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int skinny_flag = 0;
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int random_fsid = 0;
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char *new_fsid_str = NULL;
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int ret;
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int ret;
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optind = 1;
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optind = 1;
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while(1) {
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while(1) {
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int c = getopt(argc, argv, "S:rxf");
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int c = getopt(argc, argv, "S:rxfuU:");
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if (c < 0)
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if (c < 0)
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break;
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break;
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switch(c) {
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switch(c) {
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@ -439,6 +444,14 @@ int main(int argc, char *argv[])
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case 'f':
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case 'f':
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force = 1;
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force = 1;
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break;
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break;
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case 'U':
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ctree_flags |= OPEN_CTREE_IGNORE_FSID_MISMATCH;
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new_fsid_str = optarg;
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break;
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case 'u':
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ctree_flags |= OPEN_CTREE_IGNORE_FSID_MISMATCH;
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random_fsid = 1;
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break;
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default:
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default:
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print_usage();
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print_usage();
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return 1;
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return 1;
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@ -453,13 +466,37 @@ int main(int argc, char *argv[])
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return 1;
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return 1;
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}
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}
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if (!(seeding_flag + extrefs_flag + skinny_flag)) {
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if (random_fsid && new_fsid_str) {
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fprintf(stderr,
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"ERROR: Random fsid can't be used with specified fsid\n");
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return 1;
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}
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if (!(seeding_flag + extrefs_flag + skinny_flag) &&
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!(random_fsid || new_fsid_str)) {
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fprintf(stderr,
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fprintf(stderr,
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"ERROR: At least one option should be assigned.\n");
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"ERROR: At least one option should be assigned.\n");
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print_usage();
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print_usage();
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return 1;
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return 1;
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}
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}
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if (new_fsid_str) {
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uuid_t tmp;
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ret = uuid_parse(new_fsid_str, tmp);
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if (ret < 0) {
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fprintf(stderr,
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"ERROR: Could not parse UUID: %s\n",
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new_fsid_str);
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return 1;
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}
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if (!test_uuid_unique(new_fsid_str)) {
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fprintf(stderr,
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"ERROR: Fsid %s is not unique\n",
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new_fsid_str);
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return 1;
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}
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}
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ret = check_mounted(device);
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ret = check_mounted(device);
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if (ret < 0) {
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if (ret < 0) {
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fprintf(stderr, "Could not check mount status: %s\n",
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fprintf(stderr, "Could not check mount status: %s\n",
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@ -470,7 +507,7 @@ int main(int argc, char *argv[])
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return 1;
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return 1;
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}
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}
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root = open_ctree(device, 0, OPEN_CTREE_WRITES);
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root = open_ctree(device, 0, ctree_flags);
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if (!root) {
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if (!root) {
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fprintf(stderr, "Open ctree failed\n");
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fprintf(stderr, "Open ctree failed\n");
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@ -483,7 +520,8 @@ int main(int argc, char *argv[])
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ret = ask_user("We are going to clear the seeding flag, are you sure?");
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ret = ask_user("We are going to clear the seeding flag, are you sure?");
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if (!ret) {
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if (!ret) {
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fprintf(stderr, "Clear seeding flag canceled\n");
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fprintf(stderr, "Clear seeding flag canceled\n");
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return 1;
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ret = 1;
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goto out;
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}
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}
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}
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}
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@ -505,6 +543,25 @@ int main(int argc, char *argv[])
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total++;
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total++;
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}
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}
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if (random_fsid || new_fsid_str) {
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if (!force) {
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fprintf(stderr,
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"Warning: It's highly recommended to run 'btrfs check' before this operation\n");
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fprintf(stderr,
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"Also canceling running UUID change progress may cause corruption\n");
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ret = ask_user("We are going to change UUID, are your sure?");
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if (!ret) {
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fprintf(stderr, "UUID change canceled\n");
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ret = 1;
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goto out;
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}
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}
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ret = change_uuid(root->fs_info, new_fsid_str);
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if (!ret)
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success++;
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total++;
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}
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if (success == total) {
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if (success == total) {
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ret = 0;
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ret = 0;
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} else {
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} else {
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@ -512,6 +569,7 @@ int main(int argc, char *argv[])
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ret = 1;
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ret = 1;
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fprintf(stderr, "btrfstune failed\n");
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fprintf(stderr, "btrfstune failed\n");
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}
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}
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out:
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close_ctree(root);
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close_ctree(root);
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return ret;
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return ret;
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