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btrfs-progs: tune: factor out metadata UUID change to own file

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Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2023-01-18 16:02:17 +01:00
parent b2616464d3
commit 8962705987
4 changed files with 115 additions and 88 deletions
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2
Makefile
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@ -234,7 +234,7 @@ convert_objects = convert/main.o convert/common.o convert/source-fs.o \
mkfs/common.o
mkfs_objects = mkfs/main.o mkfs/common.o mkfs/rootdir.o
image_objects = image/main.o image/sanitize.o
tune_objects = tune/main.o tune/seeding.o tune/change-uuid.o
tune_objects = tune/main.o tune/seeding.o tune/change-uuid.o tune/change-metadata-uuid.o
all_objects = $(objects) $(cmds_objects) $(libbtrfs_objects) $(convert_objects) \
$(mkfs_objects) $(image_objects) $(tune_objects) $(libbtrfsutil_objects)

113
tune/change-metadata-uuid.c Normal file
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@ -0,0 +1,113 @@
/*
* 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 "kerncompat.h"
#include <stdbool.h>
#include <string.h>
#include <uuid/uuid.h>
#include "kernel-shared/ctree.h"
#include "kernel-shared/transaction.h"
#include "common/messages.h"
#include "tune/tune.h"
#include "ioctl.h"
int set_metadata_uuid(struct btrfs_root *root, const char *uuid_string)
{
struct btrfs_super_block *disk_super;
uuid_t new_fsid, unused1, unused2;
struct btrfs_trans_handle *trans;
bool new_uuid = true;
u64 incompat_flags;
bool uuid_changed;
u64 super_flags;
int ret;
disk_super = root->fs_info->super_copy;
super_flags = btrfs_super_flags(disk_super);
incompat_flags = btrfs_super_incompat_flags(disk_super);
uuid_changed = incompat_flags & BTRFS_FEATURE_INCOMPAT_METADATA_UUID;
if (super_flags & BTRFS_SUPER_FLAG_SEEDING) {
error("cannot set metadata UUID on a seed device");
return 1;
}
if (check_unfinished_fsid_change(root->fs_info, unused1, unused2)) {
error("UUID rewrite in progress, cannot change fsid");
return 1;
}
if (uuid_string)
uuid_parse(uuid_string, new_fsid);
else
uuid_generate(new_fsid);
new_uuid = (memcmp(new_fsid, disk_super->fsid, BTRFS_FSID_SIZE) != 0);
/* Step 1 sets the in progress flag */
trans = btrfs_start_transaction(root, 1);
super_flags |= BTRFS_SUPER_FLAG_CHANGING_FSID_V2;
btrfs_set_super_flags(disk_super, super_flags);
ret = btrfs_commit_transaction(trans, root);
if (ret < 0)
return ret;
if (new_uuid && uuid_changed && memcmp(disk_super->metadata_uuid,
new_fsid, BTRFS_FSID_SIZE) == 0) {
/*
* Changing fsid to be the same as metadata uuid, so just
* disable the flag
*/
memcpy(disk_super->fsid, &new_fsid, BTRFS_FSID_SIZE);
incompat_flags &= ~BTRFS_FEATURE_INCOMPAT_METADATA_UUID;
btrfs_set_super_incompat_flags(disk_super, incompat_flags);
memset(disk_super->metadata_uuid, 0, BTRFS_FSID_SIZE);
} else if (new_uuid && uuid_changed && memcmp(disk_super->metadata_uuid,
new_fsid, BTRFS_FSID_SIZE)) {
/*
* Changing fsid on an already changed FS, in this case we
* only change the fsid and don't touch metadata uuid as it
* has already the correct value
*/
memcpy(disk_super->fsid, &new_fsid, BTRFS_FSID_SIZE);
} else if (new_uuid && !uuid_changed) {
/*
* First time changing the fsid, copy the fsid to metadata_uuid
*/
incompat_flags |= BTRFS_FEATURE_INCOMPAT_METADATA_UUID;
btrfs_set_super_incompat_flags(disk_super, incompat_flags);
memcpy(disk_super->metadata_uuid, disk_super->fsid,
BTRFS_FSID_SIZE);
memcpy(disk_super->fsid, &new_fsid, BTRFS_FSID_SIZE);
} else {
/* Setting the same fsid as current, do nothing */
return 0;
}
trans = btrfs_start_transaction(root, 1);
/*
* Step 2 is to write the metadata_uuid, set the incompat flag and
* clear the in progress flag
*/
super_flags &= ~BTRFS_SUPER_FLAG_CHANGING_FSID_V2;
btrfs_set_super_flags(disk_super, super_flags);
/* Then actually copy the metadata uuid and set the incompat bit */
return btrfs_commit_transaction(trans, root);
}

87
tune/main.c
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@ -47,93 +47,6 @@
static char *device;
static int force = 0;
static int set_metadata_uuid(struct btrfs_root *root, const char *uuid_string)
{
struct btrfs_super_block *disk_super;
uuid_t new_fsid, unused1, unused2;
struct btrfs_trans_handle *trans;
bool new_uuid = true;
u64 incompat_flags;
bool uuid_changed;
u64 super_flags;
int ret;
disk_super = root->fs_info->super_copy;
super_flags = btrfs_super_flags(disk_super);
incompat_flags = btrfs_super_incompat_flags(disk_super);
uuid_changed = incompat_flags & BTRFS_FEATURE_INCOMPAT_METADATA_UUID;
if (super_flags & BTRFS_SUPER_FLAG_SEEDING) {
error("cannot set metadata UUID on a seed device");
return 1;
}
if (check_unfinished_fsid_change(root->fs_info, unused1, unused2)) {
error("UUID rewrite in progress, cannot change fsid");
return 1;
}
if (uuid_string)
uuid_parse(uuid_string, new_fsid);
else
uuid_generate(new_fsid);
new_uuid = (memcmp(new_fsid, disk_super->fsid, BTRFS_FSID_SIZE) != 0);
/* Step 1 sets the in progress flag */
trans = btrfs_start_transaction(root, 1);
super_flags |= BTRFS_SUPER_FLAG_CHANGING_FSID_V2;
btrfs_set_super_flags(disk_super, super_flags);
ret = btrfs_commit_transaction(trans, root);
if (ret < 0)
return ret;
if (new_uuid && uuid_changed && memcmp(disk_super->metadata_uuid,
new_fsid, BTRFS_FSID_SIZE) == 0) {
/*
* Changing fsid to be the same as metadata uuid, so just
* disable the flag
*/
memcpy(disk_super->fsid, &new_fsid, BTRFS_FSID_SIZE);
incompat_flags &= ~BTRFS_FEATURE_INCOMPAT_METADATA_UUID;
btrfs_set_super_incompat_flags(disk_super, incompat_flags);
memset(disk_super->metadata_uuid, 0, BTRFS_FSID_SIZE);
} else if (new_uuid && uuid_changed && memcmp(disk_super->metadata_uuid,
new_fsid, BTRFS_FSID_SIZE)) {
/*
* Changing fsid on an already changed FS, in this case we
* only change the fsid and don't touch metadata uuid as it
* has already the correct value
*/
memcpy(disk_super->fsid, &new_fsid, BTRFS_FSID_SIZE);
} else if (new_uuid && !uuid_changed) {
/*
* First time changing the fsid, copy the fsid to metadata_uuid
*/
incompat_flags |= BTRFS_FEATURE_INCOMPAT_METADATA_UUID;
btrfs_set_super_incompat_flags(disk_super, incompat_flags);
memcpy(disk_super->metadata_uuid, disk_super->fsid,
BTRFS_FSID_SIZE);
memcpy(disk_super->fsid, &new_fsid, BTRFS_FSID_SIZE);
} else {
/* Setting the same fsid as current, do nothing */
return 0;
}
trans = btrfs_start_transaction(root, 1);
/*
* Step 2 is to write the metadata_uuid, set the incompat flag and
* clear the in progress flag
*/
super_flags &= ~BTRFS_SUPER_FLAG_CHANGING_FSID_V2;
btrfs_set_super_flags(disk_super, super_flags);
/* Then actually copy the metadata uuid and set the incompat bit */
return btrfs_commit_transaction(trans, root);
}
static int delete_csum_items(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info)
{

1
tune/tune.h
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@ -25,5 +25,6 @@ int update_seeding_flag(struct btrfs_root *root, const char *device, int set_fla
int check_unfinished_fsid_change(struct btrfs_fs_info *fs_info,
uuid_t fsid_ret, uuid_t chunk_id_ret);
int change_uuid(struct btrfs_fs_info *fs_info, const char *new_fsid_str);
int set_metadata_uuid(struct btrfs_root *root, const char *uuid_string);
#endif