Commit 1e7c48fa authored Jun 02, 2016 by Jaegeuk Kim

f2fs: avoid data race between FI_DIRTY_INODE flag and update_inode



FI_DIRTY_INODE flag is not covered by inode page lock, so it can be unset
at any time like below.

Thread #1                        Thread #2
- lock_page(ipage)
- update i_fields
                                 - update i_size/i_blocks/and so on
				 - set FI_DIRTY_INODE
- reset FI_DIRTY_INODE
- set_page_dirty(ipage)

In this case, we can lose the latest i_field information.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

parent 9a449e9c

fs/f2fs/inode.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -231,6 +231,8 @@ int update_inode(struct inode inode, struct page node_page)
		{
		struct f2fs_inode *ri;

		f2fs_inode_synced(inode);

		f2fs_wait_on_page_writeback(node_page, NODE, true);

		ri = F2FS_INODE(node_page);
		@@ -265,7 +267,6 @@ int update_inode(struct inode inode, struct page node_page)

		__set_inode_rdev(inode, ri);
		set_cold_node(inode, node_page);
		f2fs_inode_synced(inode);

		/* deleted inode */
		if (inode->i_nlink == 0)