Add support for filesystem labels via mkfs.btrfs -L

[platform/upstream/btrfs-progs.git] / mkfs.c

diff --git a/mkfs.c b/mkfs.c
index 2b74309..4fae944 100644 (file)
--- a/mkfs.c
+++ b/mkfs.c
@@ -260,12 +260,32 @@ static u64 parse_profile(char *s)
        return 0;
 }
 
+static char *parse_label(char *input)
+{
+       int i;
+       int len = strlen(input);
+
+       if (len > BTRFS_LABEL_SIZE) {
+               fprintf(stderr, "Label %s is too long (max %d)\n", input,
+                       BTRFS_LABEL_SIZE);
+               exit(1);
+       }
+       for (i = 0; i < len; i++) {
+               if (input[i] == '/' || input[i] == '\\') {
+                       fprintf(stderr, "invalid label %s\n", input);
+                       exit(1);
+               }
+       }
+       return strdup(input);
+}
+
 static struct option long_options[] = {
        { "byte-count", 1, NULL, 'b' },
        { "leafsize", 1, NULL, 'l' },
+       { "label", 1, NULL, 'L'},
+       { "metadata", 1, NULL, 'm' },
        { "nodesize", 1, NULL, 'n' },
        { "sectorsize", 1, NULL, 's' },
-       { "metadata", 1, NULL, 'm' },
        { "data", 1, NULL, 'd' },
        { 0, 0, 0, 0}
 };
@@ -273,27 +293,28 @@ static struct option long_options[] = {
 int main(int ac, char **av)
 {
        char *file;
+       struct btrfs_root *root;
+       struct btrfs_trans_handle *trans;
+       char *label = NULL;
        u64 block_count = 0;
        u64 dev_block_count = 0;
-       int fd;
-       int first_fd;
-       int ret;
-       int i;
+       u64 blocks[6];
+       u64 metadata_profile = BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_DUP;
+       u64 data_profile = BTRFS_BLOCK_GROUP_RAID0;
        u32 leafsize = getpagesize();
        u32 sectorsize = 4096;
        u32 nodesize = leafsize;
        u32 stripesize = 4096;
-       u64 blocks[6];
        int zero_end = 1;
        int option_index = 0;
-       struct btrfs_root *root;
-       struct btrfs_trans_handle *trans;
-       u64 metadata_profile = BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_DUP;
-       u64 data_profile = BTRFS_BLOCK_GROUP_RAID0;
+       int fd;
+       int first_fd;
+       int ret;
+       int i;
 
        while(1) {
                int c;
-               c = getopt_long(ac, av, "b:l:n:s:m:d:", long_options,
+               c = getopt_long(ac, av, "b:l:n:s:m:d:L:", long_options,
                                &option_index);
                if (c < 0)
                        break;
@@ -301,12 +322,15 @@ int main(int ac, char **av)
                        case 'd':
                                data_profile = parse_profile(optarg);
                                break;
-                       case 'm':
-                               metadata_profile = parse_profile(optarg);
                                break;
                        case 'l':
                                leafsize = parse_size(optarg);
                                break;
+                       case 'L':
+                               label = parse_label(optarg);
+                               break;
+                       case 'm':
+                               metadata_profile = parse_profile(optarg);
                        case 'n':
                                nodesize = parse_size(optarg);
                                break;
@@ -358,7 +382,8 @@ int main(int ac, char **av)
        for (i = 0; i < 6; i++)
                blocks[i] = BTRFS_SUPER_INFO_OFFSET + leafsize * i;
 
-       ret = make_btrfs(fd, file, blocks, block_count, nodesize, leafsize,
+       ret = make_btrfs(fd, file, label, blocks, block_count,
+                        nodesize, leafsize,
                         sectorsize, stripesize);
        if (ret) {
                fprintf(stderr, "error during mkfs %d\n", ret);
@@ -369,10 +394,12 @@ int main(int ac, char **av)
                fprintf(stderr, "failed to setup the root directory\n");
                exit(1);
        }
-       printf("fs created on %s nodesize %u leafsize %u sectorsize %u bytes %llu\n",
-              file, nodesize, leafsize, sectorsize,
+       printf("fs created label %s on %s\n\tnodesize %u leafsize %u "
+              "sectorsize %u bytes %llu\n",
+              label, file, nodesize, leafsize, sectorsize,
               (unsigned long long)block_count);
 
+       free(label);
        root = open_ctree(file, 0);
        trans = btrfs_start_transaction(root, 1);
 
@@ -403,13 +430,12 @@ int main(int ac, char **av)
                        fprintf(stderr, "unable to open %s\n", file);
                        exit(1);
                }
-               fprintf(stderr, "adding device %s\n", file);
                ret = btrfs_prepare_device(fd, file, zero_end,
                                           &dev_block_count);
 
                BUG_ON(ret);
 
-               ret = btrfs_add_to_fsid(trans, root, fd, dev_block_count,
+               ret = btrfs_add_to_fsid(trans, root, fd, file, dev_block_count,
                                        sectorsize, sectorsize, sectorsize);
                BUG_ON(ret);
                btrfs_register_one_device(file);