mirror of
https://github.com/kdave/btrfs-progs
synced 2024-12-16 11:25:31 +00:00
4ac63ccbd8
The error message about the unsatisfied argument count is scrolled away by the full usage string dump. This is not considered a good usability practice. This commit switches all direct usage -> return patterns, where the argument check has no other constraint, eg. dependency on an option. Signed-off-by: David Sterba <dsterba@suse.com>
693 lines
18 KiB
C
693 lines
18 KiB
C
/*
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* Copyright (C) 2008 Oracle. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License v2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <dirent.h>
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#include <uuid/uuid.h>
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#include <getopt.h>
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#include "kerncompat.h"
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#include "ctree.h"
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#include "disk-io.h"
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#include "transaction.h"
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#include "utils.h"
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#include "volumes.h"
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#include "help.h"
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static char *device;
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static int force = 0;
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static int update_seeding_flag(struct btrfs_root *root, int set_flag)
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{
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struct btrfs_trans_handle *trans;
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struct btrfs_super_block *disk_super;
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u64 super_flags;
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int ret;
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disk_super = root->fs_info->super_copy;
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super_flags = btrfs_super_flags(disk_super);
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if (set_flag) {
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if (super_flags & BTRFS_SUPER_FLAG_SEEDING) {
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if (force)
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return 0;
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else
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warning("seeding flag is already set on %s",
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device);
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return 1;
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}
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super_flags |= BTRFS_SUPER_FLAG_SEEDING;
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} else {
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if (!(super_flags & BTRFS_SUPER_FLAG_SEEDING)) {
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warning("seeding flag is not set on %s", device);
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return 1;
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}
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super_flags &= ~BTRFS_SUPER_FLAG_SEEDING;
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warning("seeding flag cleared on %s", device);
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}
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trans = btrfs_start_transaction(root, 1);
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BUG_ON(IS_ERR(trans));
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btrfs_set_super_flags(disk_super, super_flags);
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ret = btrfs_commit_transaction(trans, root);
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return ret;
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}
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/*
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* Return 0 for no unfinished fsid change.
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* Return >0 for unfinished fsid change, and restore unfinished fsid/
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* chunk_tree_id into fsid_ret/chunk_id_ret.
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*/
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static int check_unfinished_fsid_change(struct btrfs_fs_info *fs_info,
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uuid_t fsid_ret, uuid_t chunk_id_ret)
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{
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struct btrfs_root *tree_root = fs_info->tree_root;
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u64 flags = btrfs_super_flags(fs_info->super_copy);
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if (flags & (BTRFS_SUPER_FLAG_CHANGING_FSID |
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BTRFS_SUPER_FLAG_CHANGING_FSID_V2)) {
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memcpy(fsid_ret, fs_info->super_copy->fsid, BTRFS_FSID_SIZE);
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read_extent_buffer(tree_root->node, chunk_id_ret,
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btrfs_header_chunk_tree_uuid(tree_root->node),
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BTRFS_UUID_SIZE);
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return 1;
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}
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return 0;
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}
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static int set_metadata_uuid(struct btrfs_root *root, const char *uuid_string)
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{
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struct btrfs_super_block *disk_super;
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uuid_t new_fsid, unused1, unused2;
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struct btrfs_trans_handle *trans;
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bool new_uuid = true;
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u64 incompat_flags;
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bool uuid_changed;
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u64 super_flags;
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int ret;
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disk_super = root->fs_info->super_copy;
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super_flags = btrfs_super_flags(disk_super);
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incompat_flags = btrfs_super_incompat_flags(disk_super);
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uuid_changed = incompat_flags & BTRFS_FEATURE_INCOMPAT_METADATA_UUID;
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if (super_flags & BTRFS_SUPER_FLAG_SEEDING) {
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fprintf(stderr, "cannot set metadata UUID on a seed device\n");
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return 1;
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}
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if (check_unfinished_fsid_change(root->fs_info, unused1, unused2)) {
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fprintf(stderr,
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"UUID rewrite in progress, cannot change fsid\n");
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return 1;
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}
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if (uuid_string)
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uuid_parse(uuid_string, new_fsid);
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else
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uuid_generate(new_fsid);
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new_uuid = (memcmp(new_fsid, disk_super->fsid, BTRFS_FSID_SIZE) != 0);
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/* Step 1 sets the in progress flag */
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trans = btrfs_start_transaction(root, 1);
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super_flags |= BTRFS_SUPER_FLAG_CHANGING_FSID_V2;
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btrfs_set_super_flags(disk_super, super_flags);
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ret = btrfs_commit_transaction(trans, root);
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if (ret < 0)
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return ret;
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if (new_uuid && uuid_changed && memcmp(disk_super->metadata_uuid,
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new_fsid, BTRFS_FSID_SIZE) == 0) {
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/*
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* Changing fsid to be the same as metadata uuid, so just
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* disable the flag
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*/
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memcpy(disk_super->fsid, &new_fsid, BTRFS_FSID_SIZE);
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incompat_flags &= ~BTRFS_FEATURE_INCOMPAT_METADATA_UUID;
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btrfs_set_super_incompat_flags(disk_super, incompat_flags);
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memset(disk_super->metadata_uuid, 0, BTRFS_FSID_SIZE);
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} else if (new_uuid && uuid_changed && memcmp(disk_super->metadata_uuid,
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new_fsid, BTRFS_FSID_SIZE)) {
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/*
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* Changing fsid on an already changed FS, in this case we
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* only change the fsid and don't touch metadata uuid as it
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* has already the correct value
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*/
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memcpy(disk_super->fsid, &new_fsid, BTRFS_FSID_SIZE);
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} else if (new_uuid && !uuid_changed) {
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/*
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* First time changing the fsid, copy the fsid to metadata_uuid
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*/
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incompat_flags |= BTRFS_FEATURE_INCOMPAT_METADATA_UUID;
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btrfs_set_super_incompat_flags(disk_super, incompat_flags);
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memcpy(disk_super->metadata_uuid, disk_super->fsid,
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BTRFS_FSID_SIZE);
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memcpy(disk_super->fsid, &new_fsid, BTRFS_FSID_SIZE);
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} else {
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/* Setting the same fsid as current, do nothing */
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return 0;
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}
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trans = btrfs_start_transaction(root, 1);
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/*
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* Step 2 is to write the metadata_uuid, set the incompat flag and
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* clear the in progress flag
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*/
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super_flags &= ~BTRFS_SUPER_FLAG_CHANGING_FSID_V2;
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btrfs_set_super_flags(disk_super, super_flags);
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/* Then actually copy the metadata uuid and set the incompat bit */
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return btrfs_commit_transaction(trans, root);
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}
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static int set_super_incompat_flags(struct btrfs_root *root, u64 flags)
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{
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struct btrfs_trans_handle *trans;
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struct btrfs_super_block *disk_super;
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u64 super_flags;
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int ret;
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disk_super = root->fs_info->super_copy;
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super_flags = btrfs_super_incompat_flags(disk_super);
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super_flags |= flags;
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trans = btrfs_start_transaction(root, 1);
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BUG_ON(IS_ERR(trans));
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btrfs_set_super_incompat_flags(disk_super, super_flags);
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ret = btrfs_commit_transaction(trans, root);
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return ret;
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}
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static int change_buffer_header_uuid(struct extent_buffer *eb, uuid_t new_fsid)
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{
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struct btrfs_fs_info *fs_info = eb->fs_info;
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int same_fsid = 1;
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int same_chunk_tree_uuid = 1;
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int ret;
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same_fsid = !memcmp_extent_buffer(eb, new_fsid, btrfs_header_fsid(),
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BTRFS_FSID_SIZE);
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same_chunk_tree_uuid =
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!memcmp_extent_buffer(eb, fs_info->new_chunk_tree_uuid,
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btrfs_header_chunk_tree_uuid(eb),
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BTRFS_UUID_SIZE);
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if (same_fsid && same_chunk_tree_uuid)
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return 0;
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if (!same_fsid)
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write_extent_buffer(eb, new_fsid, btrfs_header_fsid(),
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BTRFS_FSID_SIZE);
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if (!same_chunk_tree_uuid)
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write_extent_buffer(eb, fs_info->new_chunk_tree_uuid,
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btrfs_header_chunk_tree_uuid(eb),
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BTRFS_UUID_SIZE);
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ret = write_tree_block(NULL, fs_info, eb);
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return ret;
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}
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static int change_extents_uuid(struct btrfs_fs_info *fs_info, uuid_t new_fsid)
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{
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struct btrfs_root *root = fs_info->extent_root;
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struct btrfs_path path;
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struct btrfs_key key = {0, 0, 0};
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int ret = 0;
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btrfs_init_path(&path);
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/*
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* Here we don't use transaction as it will takes a lot of reserve
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* space, and that will make a near-full btrfs unable to change uuid
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*/
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ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0);
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if (ret < 0)
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goto out;
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while (1) {
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struct btrfs_extent_item *ei;
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struct extent_buffer *eb;
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u64 flags;
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u64 bytenr;
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btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]);
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if (key.type != BTRFS_EXTENT_ITEM_KEY &&
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key.type != BTRFS_METADATA_ITEM_KEY)
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goto next;
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ei = btrfs_item_ptr(path.nodes[0], path.slots[0],
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struct btrfs_extent_item);
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flags = btrfs_extent_flags(path.nodes[0], ei);
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if (!(flags & BTRFS_EXTENT_FLAG_TREE_BLOCK))
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goto next;
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bytenr = key.objectid;
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eb = read_tree_block(fs_info, bytenr, 0);
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if (IS_ERR(eb)) {
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error("failed to read tree block: %llu", bytenr);
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ret = PTR_ERR(eb);
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goto out;
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}
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ret = change_buffer_header_uuid(eb, new_fsid);
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free_extent_buffer(eb);
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if (ret < 0) {
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error("failed to change uuid of tree block: %llu",
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bytenr);
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goto out;
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}
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next:
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ret = btrfs_next_item(root, &path);
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if (ret < 0)
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goto out;
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if (ret > 0) {
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ret = 0;
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goto out;
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}
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}
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out:
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btrfs_release_path(&path);
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return ret;
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}
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static int change_device_uuid(struct extent_buffer *eb, int slot,
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uuid_t new_fsid)
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{
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struct btrfs_dev_item *di;
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struct btrfs_fs_info *fs_info = eb->fs_info;
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int ret = 0;
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di = btrfs_item_ptr(eb, slot, struct btrfs_dev_item);
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if (!memcmp_extent_buffer(eb, new_fsid,
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(unsigned long)btrfs_device_fsid(di),
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BTRFS_FSID_SIZE))
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return ret;
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write_extent_buffer(eb, new_fsid, (unsigned long)btrfs_device_fsid(di),
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BTRFS_FSID_SIZE);
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ret = write_tree_block(NULL, fs_info, eb);
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return ret;
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}
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static int change_devices_uuid(struct btrfs_root *root, uuid_t new_fsid)
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{
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struct btrfs_path path;
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struct btrfs_key key = {0, 0, 0};
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int ret = 0;
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btrfs_init_path(&path);
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/* No transaction again */
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ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0);
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if (ret < 0)
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goto out;
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while (1) {
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btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]);
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if (key.type != BTRFS_DEV_ITEM_KEY ||
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key.objectid != BTRFS_DEV_ITEMS_OBJECTID)
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goto next;
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ret = change_device_uuid(path.nodes[0], path.slots[0],
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new_fsid);
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if (ret < 0)
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goto out;
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next:
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ret = btrfs_next_item(root, &path);
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if (ret < 0)
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goto out;
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if (ret > 0) {
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ret = 0;
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goto out;
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}
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}
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out:
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btrfs_release_path(&path);
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return ret;
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}
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static int change_fsid_prepare(struct btrfs_fs_info *fs_info, uuid_t new_fsid)
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{
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struct btrfs_root *tree_root = fs_info->tree_root;
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u64 flags = btrfs_super_flags(fs_info->super_copy);
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int ret = 0;
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flags |= BTRFS_SUPER_FLAG_CHANGING_FSID;
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btrfs_set_super_flags(fs_info->super_copy, flags);
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memcpy(fs_info->super_copy->fsid, new_fsid, BTRFS_FSID_SIZE);
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ret = write_all_supers(fs_info);
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if (ret < 0)
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return ret;
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/* Also need to change the metadatauuid of the fs info */
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memcpy(fs_info->fs_devices->metadata_uuid, new_fsid, BTRFS_FSID_SIZE);
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/* also restore new chunk_tree_id into tree_root for restore */
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write_extent_buffer(tree_root->node, fs_info->new_chunk_tree_uuid,
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btrfs_header_chunk_tree_uuid(tree_root->node),
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BTRFS_UUID_SIZE);
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return write_tree_block(NULL, fs_info, tree_root->node);
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}
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static int change_fsid_done(struct btrfs_fs_info *fs_info)
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{
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u64 flags = btrfs_super_flags(fs_info->super_copy);
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flags &= ~BTRFS_SUPER_FLAG_CHANGING_FSID;
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btrfs_set_super_flags(fs_info->super_copy, flags);
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return write_all_supers(fs_info);
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}
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/*
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* Change fsid of a given fs.
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*
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* If new_fsid_str is not given, use a random generated UUID.
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* Caller should check new_fsid_str is valid
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*/
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static int change_uuid(struct btrfs_fs_info *fs_info, const char *new_fsid_str)
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{
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uuid_t new_fsid;
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uuid_t new_chunk_id;
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uuid_t old_fsid;
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char uuid_buf[BTRFS_UUID_UNPARSED_SIZE];
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int ret = 0;
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if (check_unfinished_fsid_change(fs_info, new_fsid, new_chunk_id)) {
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if (new_fsid_str) {
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uuid_t tmp;
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uuid_parse(new_fsid_str, tmp);
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if (memcmp(tmp, new_fsid, BTRFS_FSID_SIZE)) {
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error(
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"new fsid %s is not the same with unfinished fsid change",
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new_fsid_str);
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return -EINVAL;
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}
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}
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} else {
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if (new_fsid_str)
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uuid_parse(new_fsid_str, new_fsid);
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else
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uuid_generate(new_fsid);
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uuid_generate(new_chunk_id);
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}
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fs_info->new_chunk_tree_uuid = new_chunk_id;
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memcpy(old_fsid, (const char*)fs_info->fs_devices->fsid, BTRFS_UUID_SIZE);
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uuid_unparse(old_fsid, uuid_buf);
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printf("Current fsid: %s\n", uuid_buf);
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uuid_unparse(new_fsid, uuid_buf);
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printf("New fsid: %s\n", uuid_buf);
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/* Now we can begin fsid change */
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printf("Set superblock flag CHANGING_FSID\n");
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ret = change_fsid_prepare(fs_info, new_fsid);
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if (ret < 0)
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goto out;
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/* Change extents first */
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printf("Change fsid in extents\n");
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ret = change_extents_uuid(fs_info, new_fsid);
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if (ret < 0) {
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error("failed to change UUID of metadata: %d", ret);
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goto out;
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}
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/* Then devices */
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printf("Change fsid on devices\n");
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ret = change_devices_uuid(fs_info->chunk_root, new_fsid);
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if (ret < 0) {
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error("failed to change UUID of devices: %d", ret);
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goto out;
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}
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/* Last, change fsid in super */
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memcpy(fs_info->fs_devices->fsid, new_fsid, BTRFS_FSID_SIZE);
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memcpy(fs_info->super_copy->fsid, new_fsid, BTRFS_FSID_SIZE);
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ret = write_all_supers(fs_info);
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if (ret < 0)
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goto out;
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/* Now fsid change is done */
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printf("Clear superblock flag CHANGING_FSID\n");
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ret = change_fsid_done(fs_info);
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fs_info->new_chunk_tree_uuid = NULL;
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printf("Fsid change finished\n");
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out:
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return ret;
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}
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static void print_usage(void)
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{
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printf("usage: btrfstune [options] device\n");
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printf("Tune settings of filesystem features on an unmounted device\n\n");
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printf("Options:\n");
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printf(" change feature status:\n");
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printf("\t-r enable extended inode refs (mkfs: extref, for hardlink limits)\n");
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printf("\t-x enable skinny metadata extent refs (mkfs: skinny-metadata)\n");
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printf("\t-n enable no-holes feature (mkfs: no-holes, more efficient sparse file representation)\n");
|
|
printf("\t-S <0|1> set/unset seeding status of a device\n");
|
|
printf(" uuid changes:\n");
|
|
printf("\t-u rewrite fsid, use a random one\n");
|
|
printf("\t-U UUID rewrite fsid to UUID\n");
|
|
printf("\t-m change fsid in metadata_uuid to a random UUID\n");
|
|
printf("\t (incompat change, more lightweight than -u|-U)\n");
|
|
printf("\t-M UUID change fsid in metadata_uuid to UUID\n");
|
|
printf(" general:\n");
|
|
printf("\t-f allow dangerous operations, make sure that you are aware of the dangers\n");
|
|
printf("\t--help print this help\n");
|
|
}
|
|
|
|
int main(int argc, char *argv[])
|
|
{
|
|
struct btrfs_root *root;
|
|
unsigned ctree_flags = OPEN_CTREE_WRITES;
|
|
int success = 0;
|
|
int total = 0;
|
|
int seeding_flag = 0;
|
|
u64 seeding_value = 0;
|
|
int random_fsid = 0;
|
|
int change_metadata_uuid = 0;
|
|
char *new_fsid_str = NULL;
|
|
int ret;
|
|
u64 super_flags = 0;
|
|
int fd = -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:nmM:", 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 'M':
|
|
ctree_flags |= OPEN_CTREE_IGNORE_FSID_MISMATCH;
|
|
change_metadata_uuid = 1;
|
|
new_fsid_str = optarg;
|
|
break;
|
|
case 'm':
|
|
ctree_flags |= OPEN_CTREE_IGNORE_FSID_MISMATCH;
|
|
change_metadata_uuid = 1;
|
|
break;
|
|
case GETOPT_VAL_HELP:
|
|
default:
|
|
print_usage();
|
|
return c != GETOPT_VAL_HELP;
|
|
}
|
|
}
|
|
|
|
set_argv0(argv);
|
|
device = argv[optind];
|
|
if (check_argc_exact(argc - optind, 1))
|
|
return 1;
|
|
|
|
if (random_fsid && new_fsid_str) {
|
|
error("random fsid can't be used with specified fsid");
|
|
return 1;
|
|
}
|
|
if (!super_flags && !seeding_flag && !(random_fsid || new_fsid_str) &&
|
|
!change_metadata_uuid) {
|
|
error("at least one option should be specified");
|
|
print_usage();
|
|
return 1;
|
|
}
|
|
|
|
if (new_fsid_str) {
|
|
uuid_t tmp;
|
|
|
|
ret = uuid_parse(new_fsid_str, tmp);
|
|
if (ret < 0) {
|
|
error("could not parse UUID: %s", new_fsid_str);
|
|
return 1;
|
|
}
|
|
if (!test_uuid_unique(new_fsid_str)) {
|
|
error("fsid %s is not unique", new_fsid_str);
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
fd = open(device, O_RDWR);
|
|
if (fd < 0) {
|
|
error("mount check: cannot open %s: %m", device);
|
|
return 1;
|
|
}
|
|
|
|
ret = check_mounted_where(fd, device, NULL, 0, NULL,
|
|
SBREAD_IGNORE_FSID_MISMATCH);
|
|
if (ret < 0) {
|
|
errno = -ret;
|
|
error("could not check mount status of %s: %m", device);
|
|
close(fd);
|
|
return 1;
|
|
} else if (ret) {
|
|
error("%s is mounted", device);
|
|
close(fd);
|
|
return 1;
|
|
}
|
|
|
|
root = open_ctree_fd(fd, device, 0, ctree_flags);
|
|
|
|
if (!root) {
|
|
error("open ctree failed");
|
|
return 1;
|
|
}
|
|
|
|
if (seeding_flag) {
|
|
if (btrfs_fs_incompat(root->fs_info, METADATA_UUID)) {
|
|
fprintf(stderr, "SEED flag cannot be changed on a metadata-uuid changed fs\n");
|
|
ret = 1;
|
|
goto out;
|
|
}
|
|
|
|
if (!seeding_value && !force) {
|
|
warning(
|
|
"this is dangerous, clearing the seeding flag may cause the derived device not to be mountable!");
|
|
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 (change_metadata_uuid) {
|
|
if (seeding_flag) {
|
|
fprintf(stderr,
|
|
"Not allowed to set both seeding flag and uuid metadata\n");
|
|
ret = 1;
|
|
goto out;
|
|
}
|
|
|
|
if (new_fsid_str)
|
|
ret = set_metadata_uuid(root, new_fsid_str);
|
|
else
|
|
ret = set_metadata_uuid(root, NULL);
|
|
|
|
if (!ret)
|
|
success++;
|
|
total++;
|
|
}
|
|
|
|
if (random_fsid || (new_fsid_str && !change_metadata_uuid)) {
|
|
if (btrfs_fs_incompat(root->fs_info, METADATA_UUID)) {
|
|
fprintf(stderr,
|
|
"Cannot rewrite fsid while METADATA_UUID flag is active. \n"
|
|
"Ensure fsid and metadata_uuid match before retrying.\n");
|
|
ret = 1;
|
|
goto out;
|
|
}
|
|
|
|
if (!force) {
|
|
warning(
|
|
"it's recommended to run 'btrfs check --readonly' before this operation.\n"
|
|
"\tThe whole operation must finish before the filesystem can be mounted again.\n"
|
|
"\tIf cancelled or interrupted, run 'btrfstune -u' to restart.");
|
|
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;
|
|
error("btrfstune failed");
|
|
}
|
|
out:
|
|
close_ctree(root);
|
|
btrfs_close_all_devices();
|
|
|
|
return ret;
|
|
}
|