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btrfs-progs: btrfstune: remove unnecessary fsid checks 

The new fsid members were switched from dynamically allocated to
on-stack in e737a9d56b ("btrfs-progs:
btrfstune: rework change_uuid"), we don't have to do the checks in the
helpers.

Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2015-09-02 19:07:51 +02:00
parent a426f18baf
commit c3a0a488bd
1 changed files with 18 additions and 40 deletions
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58
btrfstune.c
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@ -95,17 +95,12 @@ static int change_header_uuid(struct btrfs_root *root, struct extent_buffer *eb)
int same_chunk_tree_uuid = 1;
int ret;
/* Check for whether we need to change fs/chunk id */
if (!fs_info->new_fsid && !fs_info->new_chunk_tree_uuid)
return 0;
if (fs_info->new_fsid)
same_fsid = !memcmp_extent_buffer(eb, fs_info->new_fsid,
btrfs_header_fsid(), BTRFS_FSID_SIZE);
if (fs_info->new_chunk_tree_uuid)
same_chunk_tree_uuid =
!memcmp_extent_buffer(eb, fs_info->new_chunk_tree_uuid,
btrfs_header_chunk_tree_uuid(eb),
BTRFS_UUID_SIZE);
same_fsid = !memcmp_extent_buffer(eb, fs_info->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),
BTRFS_UUID_SIZE);
if (same_fsid && same_chunk_tree_uuid)
return 0;
if (!same_fsid)
@ -127,9 +122,6 @@ static int change_extents_uuid(struct btrfs_fs_info *fs_info)
struct btrfs_key key = {0, 0, 0};
int ret = 0;
if (!fs_info->new_fsid && !fs_info->new_chunk_tree_uuid)
return 0;
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
@ -196,16 +188,16 @@ static int change_device_uuid(struct btrfs_root *root, struct extent_buffer *eb,
int ret = 0;
di = btrfs_item_ptr(eb, slot, struct btrfs_dev_item);
if (fs_info->new_fsid) {
if (!memcmp_extent_buffer(eb, fs_info->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),
BTRFS_FSID_SIZE);
ret = write_tree_block(NULL, root, eb);
}
if (!memcmp_extent_buffer(eb, fs_info->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),
BTRFS_FSID_SIZE);
ret = write_tree_block(NULL, root, eb);
return ret;
}
@ -216,12 +208,6 @@ static int change_devices_uuid(struct btrfs_fs_info *fs_info)
struct btrfs_key key = {0, 0, 0};
int ret = 0;
/*
* Unlike change_extents_uuid, we only need to change fsid in dev_item
*/
if (!fs_info->new_fsid)
return 0;
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
@ -258,11 +244,7 @@ static int change_fsid_prepare(struct btrfs_fs_info *fs_info)
u64 flags = btrfs_super_flags(fs_info->super_copy);
int ret = 0;
if (!fs_info->new_fsid && !fs_info->new_chunk_tree_uuid)
return 0;
if (fs_info->new_fsid)
flags |= BTRFS_SUPER_FLAG_CHANGING_FSID;
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);
@ -281,11 +263,7 @@ static int change_fsid_done(struct btrfs_fs_info *fs_info)
{
u64 flags = btrfs_super_flags(fs_info->super_copy);
if (!fs_info->new_fsid && !fs_info->new_chunk_tree_uuid)
return 0;
if (fs_info->new_fsid)
flags &= ~BTRFS_SUPER_FLAG_CHANGING_FSID;
flags &= ~BTRFS_SUPER_FLAG_CHANGING_FSID;
btrfs_set_super_flags(fs_info->super_copy, flags);
return write_all_supers(fs_info->tree_root);