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btrfs-progs: mkfs: create the global root's

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Now that we have all of the supporting code, add the ability to create
all of the global roots for an extent tree v2 fs.  This will default to
nr_cpu's, but also allow the user to specify how many global roots they
would like.

Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Josef Bacik 2022-03-07 17:11:03 -05:00 committed by David Sterba
parent 1f89a5d461
commit 659f041537
1 changed files with 72 additions and 1 deletions
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73
mkfs/main.c
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@ -810,6 +810,53 @@ out:
return ret;
}
static int create_global_root(struct btrfs_trans_handle *trans, u64 objectid,
int root_id)
{
struct btrfs_fs_info *fs_info = trans->fs_info;
struct btrfs_root *root;
struct btrfs_key key = {
.objectid = objectid,
.type = BTRFS_ROOT_ITEM_KEY,
.offset = root_id,
};
int ret = 0;
root = btrfs_create_tree(trans, fs_info, &key);
if (IS_ERR(root)) {
ret = PTR_ERR(root);
goto out;
}
ret = btrfs_global_root_insert(fs_info, root);
out:
if (ret)
btrfs_abort_transaction(trans, ret);
return ret;
}
static int create_global_roots(struct btrfs_trans_handle *trans,
int nr_global_roots)
{
int ret, i;
for (i = 1; i < nr_global_roots; i++) {
ret = create_global_root(trans, BTRFS_EXTENT_TREE_OBJECTID, i);
if (ret)
return ret;
ret = create_global_root(trans, BTRFS_CSUM_TREE_OBJECTID, i);
if (ret)
return ret;
ret = create_global_root(trans, BTRFS_FREE_SPACE_TREE_OBJECTID, i);
if (ret)
return ret;
}
btrfs_set_super_nr_global_roots(trans->fs_info->super_copy,
nr_global_roots);
return 0;
}
static int insert_qgroup_items(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info,
u64 qgroupid)
@ -966,13 +1013,18 @@ int BOX_MAIN(mkfs)(int argc, char **argv)
struct btrfs_mkfs_config mkfs_cfg;
enum btrfs_csum_type csum_type = BTRFS_CSUM_TYPE_CRC32;
u64 system_group_size;
int nr_global_roots = sysconf(_SC_NPROCESSORS_ONLN);
crc32c_optimization_init();
btrfs_config_init();
while(1) {
int c;
enum { GETOPT_VAL_SHRINK = 257, GETOPT_VAL_CHECKSUM };
enum {
GETOPT_VAL_SHRINK = 257,
GETOPT_VAL_CHECKSUM,
GETOPT_VAL_GLOBAL_ROOTS,
};
static const struct option long_options[] = {
{ "byte-count", required_argument, NULL, 'b' },
{ "csum", required_argument, NULL,
@ -996,6 +1048,9 @@ int BOX_MAIN(mkfs)(int argc, char **argv)
{ "quiet", 0, NULL, 'q' },
{ "verbose", 0, NULL, 'v' },
{ "shrink", no_argument, NULL, GETOPT_VAL_SHRINK },
#if EXPERIMENTAL
{ "num-global-roots", required_argument, NULL, GETOPT_VAL_GLOBAL_ROOTS },
#endif
{ "help", no_argument, NULL, GETOPT_VAL_HELP },
{ NULL, 0, NULL, 0}
};
@ -1100,6 +1155,9 @@ int BOX_MAIN(mkfs)(int argc, char **argv)
case GETOPT_VAL_CHECKSUM:
csum_type = parse_csum_type(optarg);
break;
case GETOPT_VAL_GLOBAL_ROOTS:
nr_global_roots = (int)arg_strtou64(optarg);
break;
case GETOPT_VAL_HELP:
default:
print_usage(c != GETOPT_VAL_HELP);
@ -1239,6 +1297,11 @@ int BOX_MAIN(mkfs)(int argc, char **argv)
if (features & BTRFS_FEATURE_INCOMPAT_EXTENT_TREE_V2) {
features |= BTRFS_FEATURE_INCOMPAT_NO_HOLES;
runtime_features |= BTRFS_RUNTIME_FEATURE_FREE_SPACE_TREE;
if (!nr_global_roots) {
error("you must set a non-zero num-global-roots value");
exit(1);
}
}
if (zoned) {
@ -1467,6 +1530,14 @@ int BOX_MAIN(mkfs)(int argc, char **argv)
goto error;
}
if (features & BTRFS_FEATURE_INCOMPAT_EXTENT_TREE_V2) {
ret = create_global_roots(trans, nr_global_roots);
if (ret) {
error("failed to create global roots: %d", ret);
goto error;
}
}
ret = make_root_dir(trans, root);
if (ret) {
error("failed to setup the root directory: %d", ret);