| /* |
| * Copyright (C) 2008 Oracle. All rights reserved. |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public |
| * License v2 as published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public |
| * License along with this program; if not, write to the |
| * Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
| * Boston, MA 021110-1307, USA. |
| */ |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <sys/types.h> |
| #include <sys/stat.h> |
| #include <fcntl.h> |
| #include <unistd.h> |
| #include <dirent.h> |
| #include <uuid/uuid.h> |
| #include <getopt.h> |
| |
| #include "kerncompat.h" |
| #include "ctree.h" |
| #include "disk-io.h" |
| #include "transaction.h" |
| #include "utils.h" |
| #include "volumes.h" |
| |
| static char *device; |
| static int force = 0; |
| |
| static int update_seeding_flag(struct btrfs_root *root, int set_flag) |
| { |
| struct btrfs_trans_handle *trans; |
| struct btrfs_super_block *disk_super; |
| u64 super_flags; |
| int ret; |
| |
| disk_super = root->fs_info->super_copy; |
| super_flags = btrfs_super_flags(disk_super); |
| if (set_flag) { |
| if (super_flags & BTRFS_SUPER_FLAG_SEEDING) { |
| if (force) |
| return 0; |
| else |
| fprintf(stderr, "seeding flag is already set on %s\n", device); |
| return 1; |
| } |
| super_flags |= BTRFS_SUPER_FLAG_SEEDING; |
| } else { |
| if (!(super_flags & BTRFS_SUPER_FLAG_SEEDING)) { |
| fprintf(stderr, "seeding flag is not set on %s\n", |
| device); |
| return 1; |
| } |
| super_flags &= ~BTRFS_SUPER_FLAG_SEEDING; |
| fprintf(stderr, "Warning: Seeding flag cleared.\n"); |
| } |
| |
| trans = btrfs_start_transaction(root, 1); |
| btrfs_set_super_flags(disk_super, super_flags); |
| ret = btrfs_commit_transaction(trans, root); |
| |
| return ret; |
| } |
| |
| static int set_super_incompat_flags(struct btrfs_root *root, u64 flags) |
| { |
| struct btrfs_trans_handle *trans; |
| struct btrfs_super_block *disk_super; |
| u64 super_flags; |
| int ret; |
| |
| disk_super = root->fs_info->super_copy; |
| super_flags = btrfs_super_incompat_flags(disk_super); |
| super_flags |= flags; |
| trans = btrfs_start_transaction(root, 1); |
| btrfs_set_super_incompat_flags(disk_super, super_flags); |
| ret = btrfs_commit_transaction(trans, root); |
| |
| return ret; |
| } |
| |
| static int change_header_uuid(struct btrfs_root *root, struct extent_buffer *eb) |
| { |
| struct btrfs_fs_info *fs_info = root->fs_info; |
| int same_fsid = 1; |
| int same_chunk_tree_uuid = 1; |
| int ret; |
| |
| /* Check for whether we need to change fs/chunk id */ |
| if (!fs_info->new_fsid && !fs_info->new_chunk_tree_uuid) |
| return 0; |
| if (fs_info->new_fsid) |
| same_fsid = !memcmp_extent_buffer(eb, fs_info->new_fsid, |
| btrfs_header_fsid(), BTRFS_FSID_SIZE); |
| if (fs_info->new_chunk_tree_uuid) |
| same_chunk_tree_uuid = |
| !memcmp_extent_buffer(eb, fs_info->new_chunk_tree_uuid, |
| btrfs_header_chunk_tree_uuid(eb), |
| BTRFS_UUID_SIZE); |
| if (same_fsid && same_chunk_tree_uuid) |
| return 0; |
| if (!same_fsid) |
| write_extent_buffer(eb, fs_info->new_fsid, btrfs_header_fsid(), |
| BTRFS_FSID_SIZE); |
| if (!same_chunk_tree_uuid) |
| write_extent_buffer(eb, fs_info->new_chunk_tree_uuid, |
| btrfs_header_chunk_tree_uuid(eb), |
| BTRFS_UUID_SIZE); |
| ret = write_tree_block(NULL, root, eb); |
| |
| return ret; |
| } |
| |
| static int change_extents_uuid(struct btrfs_fs_info *fs_info) |
| { |
| struct btrfs_root *root = fs_info->extent_root; |
| struct btrfs_path *path; |
| struct btrfs_key key = {0, 0, 0}; |
| int ret = 0; |
| |
| if (!fs_info->new_fsid && !fs_info->new_chunk_tree_uuid) |
| return 0; |
| |
| path = btrfs_alloc_path(); |
| if (!path) |
| return -ENOMEM; |
| |
| /* |
| * Here we don't use transaction as it will takes a lot of reserve |
| * space, and that will make a near-full btrfs unable to change uuid |
| */ |
| ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
| if (ret < 0) |
| goto out; |
| |
| while (1) { |
| struct btrfs_extent_item *ei; |
| struct extent_buffer *eb; |
| u64 flags; |
| u64 bytenr; |
| |
| btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); |
| if (key.type != BTRFS_EXTENT_ITEM_KEY && |
| key.type != BTRFS_METADATA_ITEM_KEY) |
| goto next; |
| ei = btrfs_item_ptr(path->nodes[0], path->slots[0], |
| struct btrfs_extent_item); |
| flags = btrfs_extent_flags(path->nodes[0], ei); |
| if (!(flags & BTRFS_EXTENT_FLAG_TREE_BLOCK)) |
| goto next; |
| |
| bytenr = key.objectid; |
| eb = read_tree_block(root, bytenr, root->nodesize, 0); |
| if (IS_ERR(eb)) { |
| fprintf(stderr, "Failed to read tree block: %llu\n", |
| bytenr); |
| ret = PTR_ERR(eb); |
| goto out; |
| } |
| ret = change_header_uuid(root, eb); |
| free_extent_buffer(eb); |
| if (ret < 0) { |
| fprintf(stderr, "Failed to change uuid of tree block: %llu\n", |
| bytenr); |
| goto out; |
| } |
| next: |
| ret = btrfs_next_item(root, path); |
| if (ret < 0) |
| goto out; |
| if (ret > 0) { |
| ret = 0; |
| goto out; |
| } |
| } |
| |
| out: |
| btrfs_free_path(path); |
| return ret; |
| } |
| |
| static int change_device_uuid(struct btrfs_root *root, struct extent_buffer *eb, |
| int slot) |
| { |
| struct btrfs_fs_info *fs_info = root->fs_info; |
| struct btrfs_dev_item *di; |
| int ret = 0; |
| |
| di = btrfs_item_ptr(eb, slot, struct btrfs_dev_item); |
| if (fs_info->new_fsid) { |
| if (!memcmp_extent_buffer(eb, fs_info->new_fsid, |
| (unsigned long)btrfs_device_fsid(di), |
| BTRFS_FSID_SIZE)) |
| return ret; |
| write_extent_buffer(eb, fs_info->new_fsid, |
| (unsigned long)btrfs_device_fsid(di), |
| BTRFS_FSID_SIZE); |
| ret = write_tree_block(NULL, root, eb); |
| } |
| return ret; |
| } |
| |
| static int change_devices_uuid(struct btrfs_fs_info *fs_info) |
| { |
| struct btrfs_root *root = fs_info->chunk_root; |
| struct btrfs_path *path; |
| struct btrfs_key key = {0, 0, 0}; |
| int ret = 0; |
| |
| /* |
| * Unlike change_extents_uuid, we only need to change fsid in dev_item |
| */ |
| if (!fs_info->new_fsid) |
| return 0; |
| |
| path = btrfs_alloc_path(); |
| if (!path) |
| return -ENOMEM; |
| /* No transaction again */ |
| ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
| if (ret < 0) |
| goto out; |
| |
| while (1) { |
| btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); |
| if (key.type != BTRFS_DEV_ITEM_KEY || |
| key.objectid != BTRFS_DEV_ITEMS_OBJECTID) |
| goto next; |
| ret = change_device_uuid(root, path->nodes[0], path->slots[0]); |
| if (ret < 0) |
| goto out; |
| next: |
| ret = btrfs_next_item(root, path); |
| if (ret < 0) |
| goto out; |
| if (ret > 0) { |
| ret = 0; |
| goto out; |
| } |
| } |
| out: |
| btrfs_free_path(path); |
| return ret; |
| } |
| |
| static int change_fsid_prepare(struct btrfs_fs_info *fs_info) |
| { |
| struct btrfs_root *tree_root = fs_info->tree_root; |
| u64 flags = btrfs_super_flags(fs_info->super_copy); |
| int ret = 0; |
| |
| if (!fs_info->new_fsid && !fs_info->new_chunk_tree_uuid) |
| return 0; |
| |
| if (fs_info->new_fsid) |
| flags |= BTRFS_SUPER_FLAG_CHANGING_FSID; |
| btrfs_set_super_flags(fs_info->super_copy, flags); |
| |
| memcpy(fs_info->super_copy->fsid, fs_info->new_fsid, BTRFS_FSID_SIZE); |
| ret = write_all_supers(tree_root); |
| if (ret < 0) |
| return ret; |
| |
| /* also restore new chunk_tree_id into tree_root for restore */ |
| write_extent_buffer(tree_root->node, fs_info->new_chunk_tree_uuid, |
| btrfs_header_chunk_tree_uuid(tree_root->node), |
| BTRFS_UUID_SIZE); |
| return write_tree_block(NULL, tree_root, tree_root->node); |
| } |
| |
| static int change_fsid_done(struct btrfs_fs_info *fs_info) |
| { |
| u64 flags = btrfs_super_flags(fs_info->super_copy); |
| |
| if (!fs_info->new_fsid && !fs_info->new_chunk_tree_uuid) |
| return 0; |
| |
| if (fs_info->new_fsid) |
| flags &= ~BTRFS_SUPER_FLAG_CHANGING_FSID; |
| btrfs_set_super_flags(fs_info->super_copy, flags); |
| |
| return write_all_supers(fs_info->tree_root); |
| } |
| |
| /* |
| * Return 0 for no unfinished fsid change. |
| * Return >0 for unfinished fsid change, and restore unfinished fsid/ |
| * chunk_tree_id into fsid_ret/chunk_id_ret. |
| */ |
| static int check_unfinished_fsid_change(struct btrfs_fs_info *fs_info, |
| uuid_t fsid_ret, uuid_t chunk_id_ret) |
| { |
| struct btrfs_root *tree_root = fs_info->tree_root; |
| u64 flags = btrfs_super_flags(fs_info->super_copy); |
| |
| if (flags & BTRFS_SUPER_FLAG_CHANGING_FSID) { |
| memcpy(fsid_ret, fs_info->super_copy->fsid, BTRFS_FSID_SIZE); |
| read_extent_buffer(tree_root->node, chunk_id_ret, |
| btrfs_header_chunk_tree_uuid(tree_root->node), |
| BTRFS_UUID_SIZE); |
| return 1; |
| } |
| return 0; |
| } |
| |
| /* |
| * Change fsid of a given fs. |
| * |
| * If new_fsid_str is not given, use a random generated UUID. |
| * Caller should check new_fsid_str is valid |
| */ |
| static int change_uuid(struct btrfs_fs_info *fs_info, const char *new_fsid_str) |
| { |
| uuid_t new_fsid; |
| uuid_t new_chunk_id; |
| uuid_t old_fsid; |
| char uuid_buf[BTRFS_UUID_UNPARSED_SIZE]; |
| int ret = 0; |
| |
| if (check_unfinished_fsid_change(fs_info, new_fsid, new_chunk_id)) { |
| if (new_fsid_str) { |
| uuid_t tmp; |
| |
| uuid_parse(new_fsid_str, tmp); |
| if (memcmp(tmp, new_fsid, BTRFS_FSID_SIZE)) { |
| fprintf(stderr, |
| "ERROR: New fsid %s is not the same with unfinished fsid change\n", |
| new_fsid_str); |
| return -EINVAL; |
| } |
| } |
| } else { |
| if (new_fsid_str) |
| uuid_parse(new_fsid_str, new_fsid); |
| else |
| uuid_generate(new_fsid); |
| |
| uuid_generate(new_chunk_id); |
| } |
| fs_info->new_fsid = new_fsid; |
| fs_info->new_chunk_tree_uuid = new_chunk_id; |
| |
| uuid_parse((const char*)fs_info->fsid, old_fsid); |
| uuid_unparse_upper(old_fsid, uuid_buf); |
| printf("Current fsid: %s\n", uuid_buf); |
| |
| uuid_unparse_upper(new_fsid, uuid_buf); |
| printf("New fsid: %s\n", uuid_buf); |
| /* Now we can begin fsid change */ |
| printf("Set superblock flag CHANGING_FSID\n"); |
| ret = change_fsid_prepare(fs_info); |
| if (ret < 0) |
| goto out; |
| |
| /* Change extents first */ |
| printf("Change fsid in extents\n"); |
| ret = change_extents_uuid(fs_info); |
| if (ret < 0) { |
| fprintf(stderr, "Failed to change UUID of metadata\n"); |
| goto out; |
| } |
| |
| /* Then devices */ |
| printf("Change fsid on devices\n"); |
| ret = change_devices_uuid(fs_info); |
| if (ret < 0) { |
| fprintf(stderr, "Failed to change UUID of devices\n"); |
| goto out; |
| } |
| |
| /* Last, change fsid in super */ |
| memcpy(fs_info->fs_devices->fsid, fs_info->new_fsid, |
| BTRFS_FSID_SIZE); |
| memcpy(fs_info->super_copy->fsid, fs_info->new_fsid, |
| BTRFS_FSID_SIZE); |
| ret = write_all_supers(fs_info->tree_root); |
| if (ret < 0) |
| goto out; |
| |
| /* Now fsid change is done */ |
| printf("Clear superblock flag CHANGING_FSID\n"); |
| ret = change_fsid_done(fs_info); |
| fs_info->new_fsid = NULL; |
| fs_info->new_chunk_tree_uuid = NULL; |
| printf("Fsid change finished\n"); |
| out: |
| return ret; |
| } |
| |
| static void print_usage(void) |
| { |
| fprintf(stderr, "usage: btrfstune [options] device\n"); |
| 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-n \t\tenable no-holes feature (more efficient sparse file representation)\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 seeding_flag = 0; |
| u64 seeding_value = 0; |
| int random_fsid = 0; |
| char *new_fsid_str = NULL; |
| int ret; |
| u64 super_flags = 0; |
| |
| optind = 1; |
| while(1) { |
| static const struct option long_options[] = { |
| { "help", no_argument, NULL, GETOPT_VAL_HELP}, |
| { NULL, 0, NULL, 0 } |
| }; |
| int c = getopt_long(argc, argv, "S:rxfuU:n", long_options, NULL); |
| |
| if (c < 0) |
| break; |
| switch(c) { |
| case 'S': |
| seeding_flag = 1; |
| seeding_value = arg_strtou64(optarg); |
| break; |
| case 'r': |
| super_flags |= BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF; |
| break; |
| case 'x': |
| super_flags |= BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA; |
| break; |
| case 'n': |
| super_flags |= BTRFS_FEATURE_INCOMPAT_NO_HOLES; |
| break; |
| 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; |
| case GETOPT_VAL_HELP: |
| default: |
| print_usage(); |
| return c != GETOPT_VAL_HELP; |
| } |
| } |
| |
| set_argv0(argv); |
| argc = argc - optind; |
| device = argv[optind]; |
| if (check_argc_exact(argc, 1)) { |
| print_usage(); |
| return 1; |
| } |
| |
| if (random_fsid && new_fsid_str) { |
| fprintf(stderr, |
| "ERROR: Random fsid can't be used with specified fsid\n"); |
| return 1; |
| } |
| if (!super_flags && !seeding_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", |
| strerror(-ret)); |
| return 1; |
| } else if (ret) { |
| fprintf(stderr, "%s is mounted\n", device); |
| return 1; |
| } |
| |
| root = open_ctree(device, 0, ctree_flags); |
| |
| if (!root) { |
| fprintf(stderr, "Open ctree failed\n"); |
| return 1; |
| } |
| |
| if (seeding_flag) { |
| if (!seeding_value && !force) { |
| fprintf(stderr, "Warning: This is dangerous, clearing the seeding flag may cause the derived device not to be mountable!\n"); |
| ret = ask_user("We are going to clear the seeding flag, are you sure?"); |
| if (!ret) { |
| fprintf(stderr, "Clear seeding flag canceled\n"); |
| ret = 1; |
| goto out; |
| } |
| } |
| |
| ret = update_seeding_flag(root, seeding_value); |
| if (!ret) |
| success++; |
| total++; |
| } |
| |
| if (super_flags) { |
| ret = set_super_incompat_flags(root, super_flags); |
| if (!ret) |
| success++; |
| 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 { |
| root->fs_info->readonly = 1; |
| ret = 1; |
| fprintf(stderr, "btrfstune failed\n"); |
| } |
| out: |
| close_ctree(root); |
| |
| return ret; |
| } |