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nilfs2: get maximum number of child nodes from bmap object

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The patch "reduce repetitive calculation of max number of child nodes"
gathered up the calculation of maximum number of child nodes into
nilfs_btree_nchildren_per_block() function.  This makes the function
get resultant value from a private variable in bmap object instead of
calculating it for each call.

Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
This commit is contained in:
Ryusuke Konishi 2010-07-13 23:33:54 +09:00
parent 9b7b265c9a
commit 5ad2686e92
2 changed files with 7 additions and 1 deletions
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2
fs/nilfs2/bmap.h
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@ -105,6 +105,7 @@ static inline int nilfs_bmap_is_new_ptr(unsigned long ptr)
* @b_last_allocated_ptr: last allocated ptr for data block
* @b_ptr_type: pointer type
* @b_state: state
* @b_nchildren_per_block: maximum number of child nodes for non-root nodes
*/
struct nilfs_bmap {
union {
@ -118,6 +119,7 @@ struct nilfs_bmap {
__u64 b_last_allocated_ptr;
int b_ptr_type;
int b_state;
__u16 b_nchildren_per_block;
};
/* pointer type */

6
fs/nilfs2/btree.c
View File

@ -154,7 +154,7 @@ static inline int nilfs_btree_node_size(const struct nilfs_bmap *btree)
static int nilfs_btree_nchildren_per_block(const struct nilfs_bmap *btree)
{
return NILFS_BTREE_NODE_NCHILDREN_MAX(nilfs_btree_node_size(btree));
return btree->b_nchildren_per_block;
}
static inline __le64 *
@ -2218,10 +2218,14 @@ static const struct nilfs_bmap_operations nilfs_btree_ops_gc = {
int nilfs_btree_init(struct nilfs_bmap *bmap)
{
bmap->b_ops = &nilfs_btree_ops;
bmap->b_nchildren_per_block =
NILFS_BTREE_NODE_NCHILDREN_MAX(nilfs_btree_node_size(bmap));
return 0;
}
void nilfs_btree_init_gc(struct nilfs_bmap *bmap)
{
bmap->b_ops = &nilfs_btree_ops_gc;
bmap->b_nchildren_per_block =
NILFS_BTREE_NODE_NCHILDREN_MAX(nilfs_btree_node_size(bmap));
}