[PATCH v4 3/4] Btrfs: Switch to use new generic UUID API

Andy Shevchenko
2020-02-24T15:38:01Z

There are new types and helpers that are supposed to be used in new code.

As a preparation to get rid of legacy types and API functions do
the conversion here.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
fs/btrfs/disk-io.c | 6 +++---
fs/btrfs/ioctl.c | 4 +---
fs/btrfs/root-tree.c | 4 +---
fs/btrfs/transaction.c | 7 +++----
4 files changed, 8 insertions(+), 13 deletions(-)

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 1a552391344e..a1801a8923af 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -1220,7 +1220,6 @@ struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans,
struct btrfs_key key;
unsigned int nofs_flag;
int ret = 0;
- uuid_le uuid = NULL_UUID_LE;

/*
* We're holding a transaction handle, so use a NOFS memory allocation
@@ -1259,8 +1258,9 @@ struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans,
btrfs_set_root_last_snapshot(&root->root_item, 0);
btrfs_set_root_dirid(&root->root_item, 0);
if (is_fstree(objectid))
- uuid_le_gen(&uuid);
- memcpy(root->root_item.uuid, uuid.b, BTRFS_UUID_SIZE);
+ generate_random_guid(root->root_item.uuid);
+ else
+ export_guid(root->root_item.uuid, &guid_null);
root->root_item.drop_level = 0;

key.objectid = objectid;
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 54168a7ede00..1d314b94fd93 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -574,7 +574,6 @@ static noinline int create_subvol(struct inode *dir,
u64 objectid;
u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID;
u64 index = 0;
- uuid_le new_uuid;

root_item = kzalloc(sizeof(*root_item), GFP_KERNEL);
if (!root_item)
@@ -644,8 +643,7 @@ static noinline int create_subvol(struct inode *dir,

btrfs_set_root_generation_v2(root_item,
btrfs_root_generation(root_item));
- uuid_le_gen(&new_uuid);
- memcpy(root_item->uuid, new_uuid.b, BTRFS_UUID_SIZE);
+ generate_random_guid(root_item->uuid);
btrfs_set_stack_timespec_sec(&root_item->otime, cur_time.tv_sec);
btrfs_set_stack_timespec_nsec(&root_item->otime, cur_time.tv_nsec);
root_item->ctime = root_item->otime;
diff --git a/fs/btrfs/root-tree.c b/fs/btrfs/root-tree.c
index b37904327c9e..98b6e0d980f9 100644
--- a/fs/btrfs/root-tree.c
+++ b/fs/btrfs/root-tree.c
@@ -22,7 +22,6 @@
static void btrfs_read_root_item(struct extent_buffer *eb, int slot,
struct btrfs_root_item *item)
{
- uuid_le uuid;
u32 len;
int need_reset = 0;

@@ -44,8 +43,7 @@ static void btrfs_read_root_item(struct extent_buffer *eb, int slot,
sizeof(*item) - offsetof(struct btrfs_root_item,
generation_v2));

- uuid_le_gen(&uuid);
- memcpy(item->uuid, uuid.b, BTRFS_UUID_SIZE);
+ generate_random_guid(item->uuid);
}
}

diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c
index d00af9c13c40..56db59ea9d93 100644
--- a/fs/btrfs/transaction.c
+++ b/fs/btrfs/transaction.c
@@ -1478,7 +1478,6 @@ static noinline int create_pending_snapshot(struct btrfs_trans_handle *trans,
u64 index = 0;
u64 objectid;
u64 root_flags;
- uuid_le new_uuid;

ASSERT(pending->path);
path = pending->path;
@@ -1571,8 +1570,7 @@ static noinline int create_pending_snapshot(struct btrfs_trans_handle *trans,

btrfs_set_root_generation_v2(new_root_item,
trans->transid);
- uuid_le_gen(&new_uuid);
- memcpy(new_root_item->uuid, new_uuid.b, BTRFS_UUID_SIZE);
+ generate_random_guid(new_root_item->uuid);
memcpy(new_root_item->parent_uuid, root->root_item.uuid,
BTRFS_UUID_SIZE);
if (!(root_flags & BTRFS_ROOT_SUBVOL_RDONLY)) {
@@ -1683,7 +1681,8 @@ static noinline int create_pending_snapshot(struct btrfs_trans_handle *trans,
btrfs_abort_transaction(trans, ret);
goto fail;
}
- ret = btrfs_uuid_tree_add(trans, new_uuid.b, BTRFS_UUID_KEY_SUBVOL,
+ ret = btrfs_uuid_tree_add(trans, new_root_item->uuid,
+ BTRFS_UUID_KEY_SUBVOL,
objectid);
if (ret) {
btrfs_abort_transaction(trans, ret);
--
2.25.0