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btrfs-progs: Remove btrfs_fs_info::new_fsid 

This member was used only by btrfstune when using the old method to
change fsid. It's only an in-memory value with a very specific
purpose so it makes no sense to pollute a generic structure such as
btrfs_fs_info with it. Just remove it and pass it as a function
argument where pertinent. No functional changes.

Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Nikolay Borisov 2018-10-11 18:04:03 +03:00 committed by David Sterba
parent f7717d8cdb
commit 350810997e
2 changed files with 21 additions and 26 deletions
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46
btrfstune.c
View File

@ -201,15 +201,15 @@ static int set_super_incompat_flags(struct btrfs_root *root, u64 flags)
return ret;
}
static int change_buffer_header_uuid(struct extent_buffer *eb)
static int change_buffer_header_uuid(struct extent_buffer *eb, uuid_t new_fsid)
{
struct btrfs_fs_info *fs_info = eb->fs_info;
int same_fsid = 1;
int same_chunk_tree_uuid = 1;
int ret;
same_fsid = !memcmp_extent_buffer(eb, fs_info->new_fsid,
btrfs_header_fsid(), BTRFS_FSID_SIZE);
same_fsid = !memcmp_extent_buffer(eb, new_fsid, btrfs_header_fsid(),
BTRFS_FSID_SIZE);
same_chunk_tree_uuid =
!memcmp_extent_buffer(eb, fs_info->new_chunk_tree_uuid,
btrfs_header_chunk_tree_uuid(eb),
@ -217,7 +217,7 @@ static int change_buffer_header_uuid(struct extent_buffer *eb)
if (same_fsid && same_chunk_tree_uuid)
return 0;
if (!same_fsid)
write_extent_buffer(eb, fs_info->new_fsid, btrfs_header_fsid(),
write_extent_buffer(eb, new_fsid, btrfs_header_fsid(),
BTRFS_FSID_SIZE);
if (!same_chunk_tree_uuid)
write_extent_buffer(eb, fs_info->new_chunk_tree_uuid,
@ -228,7 +228,7 @@ static int change_buffer_header_uuid(struct extent_buffer *eb)
return ret;
}
static int change_extents_uuid(struct btrfs_fs_info *fs_info)
static int change_extents_uuid(struct btrfs_fs_info *fs_info, uuid_t new_fsid)
{
struct btrfs_root *root = fs_info->extent_root;
struct btrfs_path path;
@ -267,7 +267,7 @@ static int change_extents_uuid(struct btrfs_fs_info *fs_info)
ret = PTR_ERR(eb);
goto out;
}
ret = change_buffer_header_uuid(eb);
ret = change_buffer_header_uuid(eb, new_fsid);
free_extent_buffer(eb);
if (ret < 0) {
error("failed to change uuid of tree block: %llu",
@ -289,27 +289,27 @@ out:
return ret;
}
static int change_device_uuid(struct extent_buffer *eb, int slot)
static int change_device_uuid(struct extent_buffer *eb, int slot,
uuid_t new_fsid)
{
struct btrfs_dev_item *di;
struct btrfs_fs_info *fs_info = eb->fs_info;
int ret = 0;
di = btrfs_item_ptr(eb, slot, struct btrfs_dev_item);
if (!memcmp_extent_buffer(eb, fs_info->new_fsid,
if (!memcmp_extent_buffer(eb, 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),
write_extent_buffer(eb, new_fsid, (unsigned long)btrfs_device_fsid(di),
BTRFS_FSID_SIZE);
ret = write_tree_block(NULL, fs_info, eb);
return ret;
}
static int change_devices_uuid(struct btrfs_fs_info *fs_info)
static int change_devices_uuid(struct btrfs_fs_info *fs_info, uuid_t new_fsid)
{
struct btrfs_root *root = fs_info->chunk_root;
struct btrfs_path path;
@ -327,7 +327,8 @@ static int change_devices_uuid(struct btrfs_fs_info *fs_info)
if (key.type != BTRFS_DEV_ITEM_KEY ||
key.objectid != BTRFS_DEV_ITEMS_OBJECTID)
goto next;
ret = change_device_uuid(path.nodes[0], path.slots[0]);
ret = change_device_uuid(path.nodes[0], path.slots[0],
new_fsid);
if (ret < 0)
goto out;
next:
@ -344,7 +345,7 @@ out:
return ret;
}
static int change_fsid_prepare(struct btrfs_fs_info *fs_info)
static int change_fsid_prepare(struct btrfs_fs_info *fs_info, uuid_t new_fsid)
{
struct btrfs_root *tree_root = fs_info->tree_root;
u64 flags = btrfs_super_flags(fs_info->super_copy);
@ -353,14 +354,13 @@ static int change_fsid_prepare(struct btrfs_fs_info *fs_info)
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);
memcpy(fs_info->super_copy->fsid, new_fsid, BTRFS_FSID_SIZE);
ret = write_all_supers(fs_info);
if (ret < 0)
return ret;
/* Also need to change the metadatauuid of the fs info */
memcpy(fs_info->fs_devices->metadata_uuid, fs_info->new_fsid,
BTRFS_FSID_SIZE);
memcpy(fs_info->fs_devices->metadata_uuid, new_fsid, BTRFS_FSID_SIZE);
/* also restore new chunk_tree_id into tree_root for restore */
write_extent_buffer(tree_root->node, fs_info->new_chunk_tree_uuid,
@ -414,7 +414,6 @@ static int change_uuid(struct btrfs_fs_info *fs_info, const char *new_fsid_str)
uuid_generate(new_chunk_id);
}
fs_info->new_fsid = new_fsid;
fs_info->new_chunk_tree_uuid = new_chunk_id;
memcpy(old_fsid, (const char*)fs_info->fs_devices->fsid, BTRFS_UUID_SIZE);
@ -425,13 +424,13 @@ static int change_uuid(struct btrfs_fs_info *fs_info, const char *new_fsid_str)
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);
ret = change_fsid_prepare(fs_info, new_fsid);
if (ret < 0)
goto out;
/* Change extents first */
printf("Change fsid in extents\n");
ret = change_extents_uuid(fs_info);
ret = change_extents_uuid(fs_info, new_fsid);
if (ret < 0) {
error("failed to change UUID of metadata: %d", ret);
goto out;
@ -439,17 +438,15 @@ static int change_uuid(struct btrfs_fs_info *fs_info, const char *new_fsid_str)
/* Then devices */
printf("Change fsid on devices\n");
ret = change_devices_uuid(fs_info);
ret = change_devices_uuid(fs_info, new_fsid);
if (ret < 0) {
error("failed to change UUID of devices: %d", ret);
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);
memcpy(fs_info->fs_devices->fsid, new_fsid, BTRFS_FSID_SIZE);
memcpy(fs_info->super_copy->fsid, new_fsid, BTRFS_FSID_SIZE);
ret = write_all_supers(fs_info);
if (ret < 0)
goto out;
@ -457,7 +454,6 @@ static int change_uuid(struct btrfs_fs_info *fs_info, const char *new_fsid_str)
/* 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:

1
ctree.h
View File

@ -1093,7 +1093,6 @@ struct btrfs_block_group_cache {
struct btrfs_device;
struct btrfs_fs_devices;
struct btrfs_fs_info {
u8 *new_fsid;
u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
u8 *new_chunk_tree_uuid;
struct btrfs_root *fs_root;