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btrfs-progs: Introduce change_uuid function 

This function does all the needed things for changing filesystem uuid.

Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.cz>
master
Qu Wenruo 2015-05-13 16:42:21 +02:00 committed by David Sterba
parent d275dbd183
commit 235072c2ee
1 changed files with 69 additions and 0 deletions
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69
btrfstune.c
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@ -23,11 +23,14 @@
#include <fcntl.h>
#include <unistd.h>
#include <dirent.h>
#include <uuid/uuid.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;
@ -290,6 +293,72 @@ static int change_fsid_done(struct btrfs_fs_info *fs_info)
return write_all_supers(fs_info->tree_root);
}
static int change_uuid(struct btrfs_fs_info *fs_info, const char *new_fsid,
const char *new_chunk_uuid)
{
int ret = 0;
/* caller should do extra check on passed uuid */
if (new_fsid) {
/* allocated mem will be freed at close_ctree() */
fs_info->new_fsid = malloc(BTRFS_FSID_SIZE);
if (!fs_info->new_fsid) {
ret = -ENOMEM;
goto out;
}
ret = uuid_parse(new_fsid, fs_info->new_fsid);
if (ret < 0)
goto out;
}
if (new_chunk_uuid) {
/* allocated mem will be freed at close_ctree() */
fs_info->new_chunk_tree_uuid = malloc(BTRFS_UUID_SIZE);
if (!fs_info->new_chunk_tree_uuid) {
ret = -ENOMEM;
goto out;
}
ret = uuid_parse(new_chunk_uuid, fs_info->new_chunk_tree_uuid);
if (ret < 0)
goto out;
}
/* Now we can begin fsid change */
ret = change_fsid_prepare(fs_info);
if (ret < 0)
goto out;
/* Change extents first */
ret = change_extents_uuid(fs_info);
if (ret < 0) {
fprintf(stderr, "Failed to change UUID of metadata\n");
goto out;
}
/* Then devices */
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, only fsid change needs this */
if (new_fsid) {
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 */
ret = change_fsid_done(fs_info);
out:
return ret;
}
static void print_usage(void)
{
fprintf(stderr, "usage: btrfstune [options] device\n");