forked from Mirrors/btrfs-progs
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
parent
d275dbd183
commit
235072c2ee
69
btrfstune.c
69
btrfstune.c
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@ -23,11 +23,14 @@
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#include <fcntl.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <unistd.h>
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#include <dirent.h>
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#include <dirent.h>
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#include <uuid/uuid.h>
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#include "kerncompat.h"
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#include "kerncompat.h"
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#include "ctree.h"
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#include "ctree.h"
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#include "disk-io.h"
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#include "disk-io.h"
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#include "transaction.h"
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#include "transaction.h"
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#include "utils.h"
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#include "utils.h"
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#include "volumes.h"
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static char *device;
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static char *device;
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static int force = 0;
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static int force = 0;
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@ -290,6 +293,72 @@ static int change_fsid_done(struct btrfs_fs_info *fs_info)
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return write_all_supers(fs_info->tree_root);
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return write_all_supers(fs_info->tree_root);
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}
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}
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static int change_uuid(struct btrfs_fs_info *fs_info, const char *new_fsid,
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const char *new_chunk_uuid)
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{
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int ret = 0;
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/* caller should do extra check on passed uuid */
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if (new_fsid) {
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/* allocated mem will be freed at close_ctree() */
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fs_info->new_fsid = malloc(BTRFS_FSID_SIZE);
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if (!fs_info->new_fsid) {
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ret = -ENOMEM;
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goto out;
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}
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ret = uuid_parse(new_fsid, fs_info->new_fsid);
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if (ret < 0)
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goto out;
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}
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if (new_chunk_uuid) {
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/* allocated mem will be freed at close_ctree() */
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fs_info->new_chunk_tree_uuid = malloc(BTRFS_UUID_SIZE);
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if (!fs_info->new_chunk_tree_uuid) {
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ret = -ENOMEM;
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goto out;
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}
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ret = uuid_parse(new_chunk_uuid, fs_info->new_chunk_tree_uuid);
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if (ret < 0)
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goto out;
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}
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/* Now we can begin fsid change */
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ret = change_fsid_prepare(fs_info);
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if (ret < 0)
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goto out;
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/* Change extents first */
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ret = change_extents_uuid(fs_info);
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if (ret < 0) {
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fprintf(stderr, "Failed to change UUID of metadata\n");
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goto out;
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}
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/* Then devices */
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ret = change_devices_uuid(fs_info);
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if (ret < 0) {
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fprintf(stderr, "Failed to change UUID of devices\n");
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goto out;
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}
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/* Last, change fsid in super, only fsid change needs this */
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if (new_fsid) {
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memcpy(fs_info->fs_devices->fsid, fs_info->new_fsid,
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BTRFS_FSID_SIZE);
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memcpy(fs_info->super_copy->fsid, fs_info->new_fsid,
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BTRFS_FSID_SIZE);
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ret = write_all_supers(fs_info->tree_root);
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if (ret < 0)
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goto out;
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}
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/* Now fsid change is done */
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ret = change_fsid_done(fs_info);
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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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static void print_usage(void)
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{
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{
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fprintf(stderr, "usage: btrfstune [options] device\n");
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fprintf(stderr, "usage: btrfstune [options] device\n");
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