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Commit 3033342a authored by Ryusuke Konishi's avatar Ryusuke Konishi
Browse files

nilfs2: remove useless b_low and b_high fields from nilfs_bmap struct 



This will cut off 16 bytes from the nilfs_bmap struct which is
embedded in the on-memory inode of nilfs.

The b_high field was never used, and the b_low field stores a constant
value which can be determined by whether the inode uses btree for
block mapping or not.

Signed-off-by: default avatarRyusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
parent e473c1f2

fs/nilfs2/bmap.c

+3 −10
Original line number Diff line number Diff line
@@ -101,8 +101,7 @@ static int nilfs_bmap_do_insert(struct nilfs_bmap *bmap, __u64 key, __u64 ptr) 
			if (n < 0)

				return n;

			ret = nilfs_btree_convert_and_insert(

				bmap, key, ptr, keys, ptrs, n,

				NILFS_BMAP_LARGE_LOW, NILFS_BMAP_LARGE_HIGH);

				bmap, key, ptr, keys, ptrs, n);

			if (ret == 0)

				bmap->b_u.u_flags |= NILFS_BMAP_LARGE;
@@ -158,8 +157,7 @@ static int nilfs_bmap_do_delete(struct nilfs_bmap *bmap, __u64 key) 
			if (n < 0)

				return n;

			ret = nilfs_direct_delete_and_convert(

				bmap, key, keys, ptrs, n,

				NILFS_BMAP_SMALL_LOW, NILFS_BMAP_SMALL_HIGH);

				bmap, key, keys, ptrs, n);

			if (ret == 0)

				bmap->b_u.u_flags &= ~NILFS_BMAP_LARGE;
@@ -681,12 +679,7 @@ int nilfs_bmap_read(struct nilfs_bmap *bmap, struct nilfs_inode *raw_inode) 
	}



	return (bmap->b_u.u_flags & NILFS_BMAP_LARGE) ?

		nilfs_btree_init(bmap,

				 NILFS_BMAP_LARGE_LOW,

				 NILFS_BMAP_LARGE_HIGH) :

		nilfs_direct_init(bmap,

				  NILFS_BMAP_SMALL_LOW,

				  NILFS_BMAP_SMALL_HIGH);

		nilfs_btree_init(bmap) : nilfs_direct_init(bmap);

}



/**

fs/nilfs2/bmap.h

+0 −4
Original line number Diff line number Diff line
@@ -125,8 +125,6 @@ static inline int nilfs_bmap_is_new_ptr(unsigned long ptr) 
 * @b_inode: owner of bmap

 * @b_ops: bmap operation table

 * @b_pops: bmap ptr operation table

 * @b_low: low watermark of conversion

 * @b_high: high watermark of conversion

 * @b_last_allocated_key: last allocated key for data block

 * @b_last_allocated_ptr: last allocated ptr for data block

 * @b_state: state
@@ -140,8 +138,6 @@ struct nilfs_bmap { 
	struct inode *b_inode;

	const struct nilfs_bmap_operations *b_ops;

	const struct nilfs_bmap_ptr_operations *b_pops;

	__u64 b_low;

	__u64 b_high;

	__u64 b_last_allocated_key;

	__u64 b_last_allocated_ptr;

	int b_state;

fs/nilfs2/btree.c

+7 −15
Original line number Diff line number Diff line
@@ -1527,7 +1527,7 @@ static int nilfs_btree_check_delete(struct nilfs_bmap *bmap, __u64 key) 
	if (bh != NULL)

		brelse(bh);



	return (maxkey == key) && (nextmaxkey < bmap->b_low);

	return (maxkey == key) && (nextmaxkey < NILFS_BMAP_LARGE_LOW);

}



static int nilfs_btree_gather_data(struct nilfs_bmap *bmap,
@@ -1634,7 +1634,7 @@ static void 
nilfs_btree_commit_convert_and_insert(struct nilfs_bmap *bmap,

				      __u64 key, __u64 ptr,

				      const __u64 *keys, const __u64 *ptrs,

				      int n, __u64 low, __u64 high,

				      int n,

				      union nilfs_bmap_ptr_req *dreq,

				      union nilfs_bmap_ptr_req *nreq,

				      struct buffer_head *bh)
@@ -1652,7 +1652,7 @@ nilfs_btree_commit_convert_and_insert(struct nilfs_bmap *bmap, 


	/* convert and insert */

	btree = (struct nilfs_btree *)bmap;

	nilfs_btree_init(bmap, low, high);

	nilfs_btree_init(bmap);

	if (nreq != NULL) {

		bmap->b_pops->bpop_commit_alloc_ptr(bmap, dreq);

		bmap->b_pops->bpop_commit_alloc_ptr(bmap, nreq);
@@ -1701,13 +1701,10 @@ nilfs_btree_commit_convert_and_insert(struct nilfs_bmap *bmap, 
 * @keys:

 * @ptrs:

 * @n:

 * @low:

 * @high:

 */

int nilfs_btree_convert_and_insert(struct nilfs_bmap *bmap,

				   __u64 key, __u64 ptr,

				   const __u64 *keys, const __u64 *ptrs,

				   int n, __u64 low, __u64 high)

				   const __u64 *keys, const __u64 *ptrs, int n)

{

	struct buffer_head *bh;

	union nilfs_bmap_ptr_req dreq, nreq, *di, *ni;
@@ -1732,7 +1729,7 @@ int nilfs_btree_convert_and_insert(struct nilfs_bmap *bmap, 
	if (ret < 0)

		return ret;

	nilfs_btree_commit_convert_and_insert(bmap, key, ptr, keys, ptrs, n,

					      low, high, di, ni, bh);

					      di, ni, bh);

	nilfs_bmap_add_blocks(bmap, stats.bs_nblocks);

	return 0;

}
@@ -2245,14 +2242,11 @@ static const struct nilfs_btree_operations nilfs_btree_ops_p = { 
	.btop_assign		=	nilfs_btree_assign_p,

};



int nilfs_btree_init(struct nilfs_bmap *bmap, __u64 low, __u64 high)

int nilfs_btree_init(struct nilfs_bmap *bmap)

{

	struct nilfs_btree *btree;

	struct nilfs_btree *btree = (struct nilfs_btree *)bmap;



	btree = (struct nilfs_btree *)bmap;

	bmap->b_ops = &nilfs_btree_ops;

	bmap->b_low = low;

	bmap->b_high = high;

	switch (bmap->b_inode->i_ino) {

	case NILFS_DAT_INO:

		btree->bt_ops = &nilfs_btree_ops_p;
@@ -2267,7 +2261,5 @@ int nilfs_btree_init(struct nilfs_bmap *bmap, __u64 low, __u64 high) 


void nilfs_btree_init_gc(struct nilfs_bmap *bmap)

{

	bmap->b_low = NILFS_BMAP_LARGE_LOW;

	bmap->b_high = NILFS_BMAP_LARGE_HIGH;

	bmap->b_ops = &nilfs_btree_ops_gc;

}

fs/nilfs2/btree.h

+2 −3
Original line number Diff line number Diff line
@@ -108,10 +108,9 @@ struct nilfs_btree { 


int nilfs_btree_path_cache_init(void);

void nilfs_btree_path_cache_destroy(void);

int nilfs_btree_init(struct nilfs_bmap *, __u64, __u64);

int nilfs_btree_init(struct nilfs_bmap *);

int nilfs_btree_convert_and_insert(struct nilfs_bmap *, __u64, __u64,

				   const __u64 *, const __u64 *,

				   int, __u64, __u64);

				   const __u64 *, const __u64 *, int);

void nilfs_btree_init_gc(struct nilfs_bmap *);



#endif	/* _NILFS_BTREE_H */

fs/nilfs2/direct.c

+4 −9
Original line number Diff line number Diff line
@@ -242,8 +242,7 @@ static int nilfs_direct_gather_data(struct nilfs_bmap *bmap, 
}



int nilfs_direct_delete_and_convert(struct nilfs_bmap *bmap,

				    __u64 key, __u64 *keys, __u64 *ptrs,

				    int n, __u64 low, __u64 high)

				    __u64 key, __u64 *keys, __u64 *ptrs, int n)

{

	struct nilfs_direct *direct;

	__le64 *dptrs;
@@ -273,8 +272,7 @@ int nilfs_direct_delete_and_convert(struct nilfs_bmap *bmap, 
			dptrs[i] = NILFS_BMAP_INVALID_PTR;

	}



	nilfs_direct_init(bmap, low, high);



	nilfs_direct_init(bmap);

	return 0;

}
@@ -410,14 +408,11 @@ static const struct nilfs_direct_operations nilfs_direct_ops_p = { 
	.dop_assign		=	nilfs_direct_assign_p,

};



int nilfs_direct_init(struct nilfs_bmap *bmap, __u64 low, __u64 high)

int nilfs_direct_init(struct nilfs_bmap *bmap)

{

	struct nilfs_direct *direct;

	struct nilfs_direct *direct = (struct nilfs_direct *)bmap;



	direct = (struct nilfs_direct *)bmap;

	bmap->b_ops = &nilfs_direct_ops;

	bmap->b_low = low;

	bmap->b_high = high;

	switch (bmap->b_inode->i_ino) {

	case NILFS_DAT_INO:

		direct->d_ops = &nilfs_direct_ops_p;