nilfs2: allow btree code to directly call dat operations

The current btree code is written so that btree functions call dat
operations via wrapper functions in bmap.c when they allocate, free,
or modify virtual block addresses.

This abstraction requires additional function calls and causes
frequent call of nilfs_bmap_get_dat() function since it is used in the
every wrapper function.

This removes the wrapper functions and makes them available from
btree.c and direct.c, which will increase the opportunity of
compiler optimization.

Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>

1 files changed, 58 insertions, 103 deletions

diff --git a/fs/nilfs2/direct.c b/fs/nilfs2/direct.c
index 342d976..d369ac7 100644
--- a/fs/nilfs2/direct.c
+++ b/fs/nilfs2/direct.c
@@ -125,106 +125,64 @@ static void nilfs_direct_set_target_v(struct nilfs_direct *direct,
 	direct->d_bmap.b_last_allocated_ptr = ptr;
 }
 
-static int nilfs_direct_prepare_insert(struct nilfs_direct *direct,
-				       __u64 key,
-				       union nilfs_bmap_ptr_req *req,
-				       struct nilfs_bmap_stats *stats)
-{
-	int ret;
-
-	if (NILFS_BMAP_USE_VBN(&direct->d_bmap))
-		req->bpr_ptr = nilfs_direct_find_target_v(direct, key);
-	ret = nilfs_bmap_prepare_alloc_ptr(&direct->d_bmap, req);
-	if (ret < 0)
-		return ret;
-
-	stats->bs_nblocks = 1;
-	return 0;
-}
-
-static void nilfs_direct_commit_insert(struct nilfs_direct *direct,
-				       union nilfs_bmap_ptr_req *req,
-				       __u64 key, __u64 ptr)
-{
-	struct buffer_head *bh;
-
-	/* ptr must be a pointer to a buffer head. */
-	bh = (struct buffer_head *)((unsigned long)ptr);
-	set_buffer_nilfs_volatile(bh);
-
-	nilfs_bmap_commit_alloc_ptr(&direct->d_bmap, req);
-	nilfs_direct_set_ptr(direct, key, req->bpr_ptr);
-
-	if (!nilfs_bmap_dirty(&direct->d_bmap))
-		nilfs_bmap_set_dirty(&direct->d_bmap);
-
-	if (NILFS_BMAP_USE_VBN(&direct->d_bmap))
-		nilfs_direct_set_target_v(direct, key, req->bpr_ptr);
-}
-
 static int nilfs_direct_insert(struct nilfs_bmap *bmap, __u64 key, __u64 ptr)
 {
-	struct nilfs_direct *direct;
+	struct nilfs_direct *direct = (struct nilfs_direct *)bmap;
 	union nilfs_bmap_ptr_req req;
-	struct nilfs_bmap_stats stats;
+	struct inode *dat = NULL;
+	struct buffer_head *bh;
 	int ret;
 
-	direct = (struct nilfs_direct *)bmap;
 	if (key > NILFS_DIRECT_KEY_MAX)
 		return -ENOENT;
 	if (nilfs_direct_get_ptr(direct, key) != NILFS_BMAP_INVALID_PTR)
 		return -EEXIST;
 
-	ret = nilfs_direct_prepare_insert(direct, key, &req, &stats);
-	if (ret < 0)
-		return ret;
-	nilfs_direct_commit_insert(direct, &req, key, ptr);
-	nilfs_bmap_add_blocks(bmap, stats.bs_nblocks);
+	if (NILFS_BMAP_USE_VBN(bmap)) {
+		req.bpr_ptr = nilfs_direct_find_target_v(direct, key);
+		dat = nilfs_bmap_get_dat(bmap);
+	}
+	ret = nilfs_bmap_prepare_alloc_ptr(bmap, &req, dat);
+	if (!ret) {
+		/* ptr must be a pointer to a buffer head. */
+		bh = (struct buffer_head *)((unsigned long)ptr);
+		set_buffer_nilfs_volatile(bh);
 
-	return 0;
-}
+		nilfs_bmap_commit_alloc_ptr(bmap, &req, dat);
+		nilfs_direct_set_ptr(direct, key, req.bpr_ptr);
 
-static int nilfs_direct_prepare_delete(struct nilfs_direct *direct,
-				       union nilfs_bmap_ptr_req *req,
-				       __u64 key,
-				       struct nilfs_bmap_stats *stats)
-{
-	int ret;
+		if (!nilfs_bmap_dirty(bmap))
+			nilfs_bmap_set_dirty(bmap);
 
-	req->bpr_ptr = nilfs_direct_get_ptr(direct, key);
-	ret = nilfs_bmap_prepare_end_ptr(&direct->d_bmap, req);
-	if (!ret)
-		stats->bs_nblocks = 1;
-	return ret;
-}
+		if (NILFS_BMAP_USE_VBN(bmap))
+			nilfs_direct_set_target_v(direct, key, req.bpr_ptr);
 
-static void nilfs_direct_commit_delete(struct nilfs_direct *direct,
-				       union nilfs_bmap_ptr_req *req,
-				       __u64 key)
-{
-	nilfs_bmap_commit_end_ptr(&direct->d_bmap, req);
-	nilfs_direct_set_ptr(direct, key, NILFS_BMAP_INVALID_PTR);
+		nilfs_bmap_add_blocks(bmap, 1);
+	}
+	return ret;
 }
 
 static int nilfs_direct_delete(struct nilfs_bmap *bmap, __u64 key)
 {
-	struct nilfs_direct *direct;
+	struct nilfs_direct *direct = (struct nilfs_direct *)bmap;
 	union nilfs_bmap_ptr_req req;
-	struct nilfs_bmap_stats stats;
+	struct inode *dat;
 	int ret;
 
-	direct = (struct nilfs_direct *)bmap;
-	if ((key > NILFS_DIRECT_KEY_MAX) ||
+	if (key > NILFS_DIRECT_KEY_MAX ||
 	    nilfs_direct_get_ptr(direct, key) == NILFS_BMAP_INVALID_PTR)
 		return -ENOENT;
 
-	ret = nilfs_direct_prepare_delete(direct, &req, key, &stats);
-	if (ret < 0)
-		return ret;
-	nilfs_direct_commit_delete(direct, &req, key);
-	nilfs_bmap_sub_blocks(bmap, stats.bs_nblocks);
+	dat = NILFS_BMAP_USE_VBN(bmap) ? nilfs_bmap_get_dat(bmap) : NULL;
+	req.bpr_ptr = nilfs_direct_get_ptr(direct, key);
 
-	return 0;
+	ret = nilfs_bmap_prepare_end_ptr(bmap, &req, dat);
+	if (!ret) {
+		nilfs_bmap_commit_end_ptr(bmap, &req, dat);
+		nilfs_direct_set_ptr(direct, key, NILFS_BMAP_INVALID_PTR);
+		nilfs_bmap_sub_blocks(bmap, 1);
+	}
+	return ret;
 }
 
 static int nilfs_direct_last_key(const struct nilfs_bmap *bmap, __u64 *keyp)
@@ -310,59 +268,56 @@ int nilfs_direct_delete_and_convert(struct nilfs_bmap *bmap,
 	return 0;
 }
 
-static int nilfs_direct_propagate_v(struct nilfs_direct *direct,
-				    struct buffer_head *bh)
+static int nilfs_direct_propagate(const struct nilfs_bmap *bmap,
+				  struct buffer_head *bh)
 {
-	union nilfs_bmap_ptr_req oldreq, newreq;
+	struct nilfs_direct *direct = (struct nilfs_direct *)bmap;
+	struct nilfs_palloc_req oldreq, newreq;
+	struct inode *dat;
 	__u64 key;
 	__u64 ptr;
 	int ret;
 
-	key = nilfs_bmap_data_get_key(&direct->d_bmap, bh);
+	if (!NILFS_BMAP_USE_VBN(bmap))
+		return 0;
+
+	dat = nilfs_bmap_get_dat(bmap);
+	key = nilfs_bmap_data_get_key(bmap, bh);
 	ptr = nilfs_direct_get_ptr(direct, key);
 	if (!buffer_nilfs_volatile(bh)) {
-		oldreq.bpr_ptr = ptr;
-		newreq.bpr_ptr = ptr;
-		ret = nilfs_bmap_prepare_update_v(&direct->d_bmap, &oldreq,
-						  &newreq);
+		oldreq.pr_entry_nr = ptr;
+		newreq.pr_entry_nr = ptr;
+		ret = nilfs_dat_prepare_update(dat, &oldreq, &newreq);
 		if (ret < 0)
 			return ret;
-		nilfs_bmap_commit_update_v(&direct->d_bmap, &oldreq, &newreq);
+		nilfs_dat_commit_update(dat, &oldreq, &newreq,
+					bmap->b_ptr_type == NILFS_BMAP_PTR_VS);
 		set_buffer_nilfs_volatile(bh);
-		nilfs_direct_set_ptr(direct, key, newreq.bpr_ptr);
+		nilfs_direct_set_ptr(direct, key, newreq.pr_entry_nr);
 	} else
-		ret = nilfs_bmap_mark_dirty(&direct->d_bmap, ptr);
+		ret = nilfs_dat_mark_dirty(dat, ptr);
 
 	return ret;
 }
 
-static int nilfs_direct_propagate(const struct nilfs_bmap *bmap,
-				  struct buffer_head *bh)
-{
-	struct nilfs_direct *direct = (struct nilfs_direct *)bmap;
-
-	return NILFS_BMAP_USE_VBN(bmap) ?
-		nilfs_direct_propagate_v(direct, bh) : 0;
-}
-
 static int nilfs_direct_assign_v(struct nilfs_direct *direct,
 				 __u64 key, __u64 ptr,
 				 struct buffer_head **bh,
 				 sector_t blocknr,
 				 union nilfs_binfo *binfo)
 {
+	struct inode *dat = nilfs_bmap_get_dat(&direct->d_bmap);
 	union nilfs_bmap_ptr_req req;
 	int ret;
 
 	req.bpr_ptr = ptr;
-	ret = nilfs_bmap_start_v(&direct->d_bmap, &req, blocknr);
-	if (unlikely(ret < 0))
-		return ret;
-
-	binfo->bi_v.bi_vblocknr = nilfs_bmap_ptr_to_dptr(ptr);
-	binfo->bi_v.bi_blkoff = nilfs_bmap_key_to_dkey(key);
-
-	return 0;
+	ret = nilfs_dat_prepare_start(dat, &req.bpr_req);
+	if (!ret) {
+		nilfs_dat_commit_start(dat, &req.bpr_req, blocknr);
+		binfo->bi_v.bi_vblocknr = nilfs_bmap_ptr_to_dptr(ptr);
+		binfo->bi_v.bi_blkoff = nilfs_bmap_key_to_dkey(key);
+	}
+	return ret;
 }
 
 static int nilfs_direct_assign_p(struct nilfs_direct *direct,