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Commit 293f7e07 authored by Li Zefan's avatar Li Zefan Committed by Chris Mason
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Btrfs: zero unused bytes in inode item 



The otime field is not zeroed, so users will see random otime in an old
filesystem with a new kernel which has otime support in the future.

The reserved bytes are also not zeroed, and we'll have compatibility
issue if we make use of those bytes.

Signed-off-by: default avatarLi Zefan <lizefan@huawei.com>
parent b4d7c3c9

fs/btrfs/delayed-inode.c

+1 −0
Original line number Diff line number Diff line
@@ -62,6 +62,7 @@ static inline void btrfs_init_delayed_node( 
	INIT_LIST_HEAD(&delayed_node->n_list);

	INIT_LIST_HEAD(&delayed_node->p_list);

	delayed_node->bytes_reserved = 0;

	memset(&delayed_node->inode_item, 0, sizeof(delayed_node->inode_item));

}



static inline int btrfs_is_continuous_delayed_item(

fs/btrfs/inode.c

+2 −0
Original line number Diff line number Diff line
@@ -4693,6 +4693,8 @@ static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans, 
	inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;

	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,

			     sizeof(*inode_item));

	fill_inode_item(trans, path->nodes[0], inode_item, inode);



	ref = btrfs_item_ptr(path->nodes[0], path->slots[0] + 1,