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btrfs: rename and export read_node_slot 

Preparatory work for code that will be moved out of ctree and uses this
function.

Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2019-08-21 19:16:27 +02:00
parent 8a953348af
commit 4b231ae474
2 changed files with 14 additions and 11 deletions
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22
fs/btrfs/ctree.c
View File

@ -1792,8 +1792,8 @@ static void root_sub_used(struct btrfs_root *root, u32 size)
/* given a node and slot number, this reads the blocks it points to. The
* extent buffer is returned with a reference taken (but unlocked).
*/
static noinline struct extent_buffer *read_node_slot(
struct extent_buffer *parent, int slot)
struct extent_buffer *btrfs_read_node_slot(struct extent_buffer *parent,
int slot)
{
int level = btrfs_header_level(parent);
struct extent_buffer *eb;
@ -1862,7 +1862,7 @@ static noinline int balance_level(struct btrfs_trans_handle *trans,
return 0;
/* promote the child to a root */
child = read_node_slot(mid, 0);
child = btrfs_read_node_slot(mid, 0);
if (IS_ERR(child)) {
ret = PTR_ERR(child);
btrfs_handle_fs_error(fs_info, ret, NULL);
@ -1902,7 +1902,7 @@ static noinline int balance_level(struct btrfs_trans_handle *trans,
BTRFS_NODEPTRS_PER_BLOCK(fs_info) / 4)
return 0;
left = read_node_slot(parent, pslot - 1);
left = btrfs_read_node_slot(parent, pslot - 1);
if (IS_ERR(left))
left = NULL;
@ -1917,7 +1917,7 @@ static noinline int balance_level(struct btrfs_trans_handle *trans,
}
}
right = read_node_slot(parent, pslot + 1);
right = btrfs_read_node_slot(parent, pslot + 1);
if (IS_ERR(right))
right = NULL;
@ -2077,7 +2077,7 @@ static noinline int push_nodes_for_insert(struct btrfs_trans_handle *trans,
if (!parent)
return 1;
left = read_node_slot(parent, pslot - 1);
left = btrfs_read_node_slot(parent, pslot - 1);
if (IS_ERR(left))
left = NULL;
@ -2129,7 +2129,7 @@ static noinline int push_nodes_for_insert(struct btrfs_trans_handle *trans,
btrfs_tree_unlock(left);
free_extent_buffer(left);
}
right = read_node_slot(parent, pslot + 1);
right = btrfs_read_node_slot(parent, pslot + 1);
if (IS_ERR(right))
right = NULL;
@ -3783,7 +3783,7 @@ static int push_leaf_right(struct btrfs_trans_handle *trans, struct btrfs_root
btrfs_assert_tree_locked(path->nodes[1]);
right = read_node_slot(upper, slot + 1);
right = btrfs_read_node_slot(upper, slot + 1);
/*
* slot + 1 is not valid or we fail to read the right node,
* no big deal, just return.
@ -4017,7 +4017,7 @@ static int push_leaf_left(struct btrfs_trans_handle *trans, struct btrfs_root
btrfs_assert_tree_locked(path->nodes[1]);
left = read_node_slot(path->nodes[1], slot - 1);
left = btrfs_read_node_slot(path->nodes[1], slot - 1);
/*
* slot - 1 is not valid or we fail to read the left node,
* no big deal, just return.
@ -5224,7 +5224,7 @@ int btrfs_search_forward(struct btrfs_root *root, struct btrfs_key *min_key,
goto out;
}
btrfs_set_path_blocking(path);
cur = read_node_slot(cur, slot);
cur = btrfs_read_node_slot(cur, slot);
if (IS_ERR(cur)) {
ret = PTR_ERR(cur);
goto out;
@ -5251,7 +5251,7 @@ static int tree_move_down(struct btrfs_path *path, int *level)
struct extent_buffer *eb;
BUG_ON(*level == 0);
eb = read_node_slot(path->nodes[*level], path->slots[*level]);
eb = btrfs_read_node_slot(path->nodes[*level], path->slots[*level]);
if (IS_ERR(eb))
return PTR_ERR(eb);

3
fs/btrfs/ctree.h
View File

@ -2587,6 +2587,9 @@ int btrfs_find_next_key(struct btrfs_root *root, struct btrfs_path *path,
int btrfs_search_forward(struct btrfs_root *root, struct btrfs_key *min_key,
struct btrfs_path *path,
u64 min_trans);
struct extent_buffer *btrfs_read_node_slot(struct extent_buffer *parent,
int slot);
enum btrfs_compare_tree_result {
BTRFS_COMPARE_TREE_NEW,
BTRFS_COMPARE_TREE_DELETED,