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btrfs-progs: btrfstune: add '-U' and '-u' option to change fsid

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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>
This commit is contained in:
Qu Wenruo 2015-05-15 14:28:25 +08:00 committed by David Sterba
parent 0522713f3c
commit 5fd37009da
1 changed files with 63 additions and 5 deletions
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68
btrfstune.c
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@ -406,23 +406,28 @@ 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 \t\tchange fsid, use a random one\n");
fprintf(stderr, "\t-U UUID\t\tchange fsid to UUID\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 +444,14 @@ 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 +466,37 @@ 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 +507,7 @@ 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 +520,8 @@ 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 +543,25 @@ 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 +569,7 @@ int main(int argc, char *argv[])
ret = 1;
fprintf(stderr, "btrfstune failed\n");
}
out:
close_ctree(root);
return ret;