btrfs: remove constant parameter to memset_extent_buffer and rename it

The only memset we do is to 0, so sink the parameter to the function and
simplify all calls. Rename the function to reflect the behaviour.

Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/ctree.c

@@ -3348,7 +3348,7 @@ static noinline int insert_new_root(struct btrfs_trans_handle *trans,
 
 	root_add_used(root, root->nodesize);
 
-	memset_extent_buffer(c, 0, 0, sizeof(struct btrfs_header));
+	memzero_extent_buffer(c, 0, sizeof(struct btrfs_header));
 	btrfs_set_header_nritems(c, 1);
 	btrfs_set_header_level(c, level);
 	btrfs_set_header_bytenr(c, c->start);
@@ -3484,7 +3484,7 @@ static noinline int split_node(struct btrfs_trans_handle *trans,
 
 	root_add_used(root, root->nodesize);
 
-	memset_extent_buffer(split, 0, 0, sizeof(struct btrfs_header));
+	memzero_extent_buffer(split, 0, sizeof(struct btrfs_header));
 	btrfs_set_header_level(split, btrfs_header_level(c));
 	btrfs_set_header_bytenr(split, split->start);
 	btrfs_set_header_generation(split, trans->transid);
@@ -4270,7 +4270,7 @@ again:
 
 	root_add_used(root, root->nodesize);
 
-	memset_extent_buffer(right, 0, 0, sizeof(struct btrfs_header));
+	memzero_extent_buffer(right, 0, sizeof(struct btrfs_header));
 	btrfs_set_header_bytenr(right, right->start);
 	btrfs_set_header_generation(right, trans->transid);
 	btrfs_set_header_backref_rev(right, BTRFS_MIXED_BACKREF_REV);

fs/btrfs/disk-io.c

@@ -1412,7 +1412,7 @@ struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans,
 		goto fail;
 	}
 
-	memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header));
+	memzero_extent_buffer(leaf, 0, sizeof(struct btrfs_header));
 	btrfs_set_header_bytenr(leaf, leaf->start);
 	btrfs_set_header_generation(leaf, trans->transid);
 	btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV);
@@ -1496,7 +1496,7 @@ static struct btrfs_root *alloc_log_tree(struct btrfs_trans_handle *trans,
 		return ERR_CAST(leaf);
 	}
 
-	memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header));
+	memzero_extent_buffer(leaf, 0, sizeof(struct btrfs_header));
 	btrfs_set_header_bytenr(leaf, leaf->start);
 	btrfs_set_header_generation(leaf, trans->transid);
 	btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV);

fs/btrfs/extent-tree.c

@@ -1114,7 +1114,7 @@ static int convert_extent_item_v0(struct btrfs_trans_handle *trans,
 				       BTRFS_BLOCK_FLAG_FULL_BACKREF);
 		bi = (struct btrfs_tree_block_info *)(item + 1);
 		/* FIXME: get first key of the block */
-		memset_extent_buffer(leaf, 0, (unsigned long)bi, sizeof(*bi));
+		memzero_extent_buffer(leaf, (unsigned long)bi, sizeof(*bi));
 		btrfs_set_tree_block_level(leaf, bi, (int)owner);
 	} else {
 		btrfs_set_extent_flags(leaf, item, BTRFS_EXTENT_FLAG_DATA);

fs/btrfs/extent_io.c

@@ -3743,7 +3743,7 @@ static noinline_for_stack int write_one_eb(struct extent_buffer *eb,
 	if (btrfs_header_level(eb) > 0) {
 		end = btrfs_node_key_ptr_offset(nritems);
 
-		memset_extent_buffer(eb, 0, end, eb->len - end);
+		memzero_extent_buffer(eb, end, eb->len - end);
 	} else {
 		/*
 		 * leaf:
@@ -3752,7 +3752,7 @@ static noinline_for_stack int write_one_eb(struct extent_buffer *eb,
 		start = btrfs_item_nr_offset(nritems);
 		end = btrfs_leaf_data(eb) +
 		      leaf_data_end(fs_info->tree_root, eb);
-		memset_extent_buffer(eb, 0, start, end - start);
+		memzero_extent_buffer(eb, start, end - start);
 	}
 
 	for (i = 0; i < num_pages; i++) {
@@ -5517,8 +5517,8 @@ void write_extent_buffer(struct extent_buffer *eb, const void *srcv,
 	}
 }
 
-void memset_extent_buffer(struct extent_buffer *eb, char c,
-			  unsigned long start, unsigned long len)
+void memzero_extent_buffer(struct extent_buffer *eb, unsigned long start,
+		unsigned long len)
 {
 	size_t cur;
 	size_t offset;
@@ -5538,7 +5538,7 @@ void memset_extent_buffer(struct extent_buffer *eb, char c,
 
 		cur = min(len, PAGE_SIZE - offset);
 		kaddr = page_address(page);
-		memset(kaddr + offset, c, cur);
+		memset(kaddr + offset, 0, cur);
 
 		len -= cur;
 		offset = 0;

fs/btrfs/extent_io.h

@@ -417,8 +417,8 @@ void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
 			   unsigned long src_offset, unsigned long len);
 void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
 			   unsigned long src_offset, unsigned long len);
-void memset_extent_buffer(struct extent_buffer *eb, char c,
-			  unsigned long start, unsigned long len);
+void memzero_extent_buffer(struct extent_buffer *eb, unsigned long start,
+			   unsigned long len);
 int extent_buffer_test_bit(struct extent_buffer *eb, unsigned long start,
 			   unsigned long pos);
 void extent_buffer_bitmap_set(struct extent_buffer *eb, unsigned long start,

fs/btrfs/file-item.c

@@ -689,7 +689,7 @@ int btrfs_del_csums(struct btrfs_trans_handle *trans,
 			item_offset = btrfs_item_ptr_offset(leaf,
 							    path->slots[0]);
 
-			memset_extent_buffer(leaf, 0, item_offset + offset,
+			memzero_extent_buffer(leaf, item_offset + offset,
 					     shift_len);
 			key.offset = bytenr;
 

fs/btrfs/free-space-cache.c

@@ -153,7 +153,7 @@ static int __create_free_space_inode(struct btrfs_root *root,
 	inode_item = btrfs_item_ptr(leaf, path->slots[0],
 				    struct btrfs_inode_item);
 	btrfs_item_key(leaf, &disk_key, path->slots[0]);
-	memset_extent_buffer(leaf, 0, (unsigned long)inode_item,
+	memzero_extent_buffer(leaf, (unsigned long)inode_item,
 			     sizeof(*inode_item));
 	btrfs_set_inode_generation(leaf, inode_item, trans->transid);
 	btrfs_set_inode_size(leaf, inode_item, 0);
@@ -181,7 +181,7 @@ static int __create_free_space_inode(struct btrfs_root *root,
 	leaf = path->nodes[0];
 	header = btrfs_item_ptr(leaf, path->slots[0],
 				struct btrfs_free_space_header);
-	memset_extent_buffer(leaf, 0, (unsigned long)header, sizeof(*header));
+	memzero_extent_buffer(leaf, (unsigned long)header, sizeof(*header));
 	btrfs_set_free_space_key(leaf, header, &disk_key);
 	btrfs_mark_buffer_dirty(leaf);
 	btrfs_release_path(path);

fs/btrfs/inode.c

@@ -6276,7 +6276,7 @@ static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans,
 
 	inode_item = btrfs_item_ptr(path->nodes[0], path->slots[0],
 				  struct btrfs_inode_item);
-	memset_extent_buffer(path->nodes[0], 0, (unsigned long)inode_item,
+	memzero_extent_buffer(path->nodes[0], (unsigned long)inode_item,
 			     sizeof(*inode_item));
 	fill_inode_item(trans, path->nodes[0], inode_item, inode);
 

fs/btrfs/ioctl.c

@@ -501,7 +501,7 @@ static noinline int create_subvol(struct inode *dir,
 		goto fail;
 	}
 
-	memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header));
+	memzero_extent_buffer(leaf, 0, sizeof(struct btrfs_header));
 	btrfs_set_header_bytenr(leaf, leaf->start);
 	btrfs_set_header_generation(leaf, trans->transid);
 	btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV);

fs/btrfs/relocation.c

@@ -4255,7 +4255,7 @@ static int __insert_orphan_inode(struct btrfs_trans_handle *trans,
 
 	leaf = path->nodes[0];
 	item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_inode_item);
-	memset_extent_buffer(leaf, 0, (unsigned long)item, sizeof(*item));
+	memzero_extent_buffer(leaf, (unsigned long)item, sizeof(*item));
 	btrfs_set_inode_generation(leaf, item, 1);
 	btrfs_set_inode_size(leaf, item, 0);
 	btrfs_set_inode_mode(leaf, item, S_IFREG | 0600);

fs/btrfs/tests/extent-io-tests.c

@@ -306,7 +306,7 @@ static int __test_eb_bitmaps(unsigned long *bitmap, struct extent_buffer *eb,
 	int ret;
 
 	memset(bitmap, 0, len);
-	memset_extent_buffer(eb, 0, 0, len);
+	memzero_extent_buffer(eb, 0, len);
 	if (memcmp_extent_buffer(eb, bitmap, 0, len) != 0) {
 		test_msg("Bitmap was not zeroed\n");
 		return -EINVAL;

fs/btrfs/volumes.c

@@ -3062,7 +3062,7 @@ static int insert_balance_item(struct btrfs_root *root,
 	leaf = path->nodes[0];
 	item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_balance_item);
 
-	memset_extent_buffer(leaf, 0, (unsigned long)item, sizeof(*item));
+	memzero_extent_buffer(leaf, (unsigned long)item, sizeof(*item));
 
 	btrfs_cpu_balance_args_to_disk(&disk_bargs, &bctl->data);
 	btrfs_set_balance_data(leaf, item, &disk_bargs);