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f2fs: avoid data race between FI_DIRTY_INODE flag and update_inode

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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>
This commit is contained in:
Jaegeuk Kim 2016-06-02 14:15:56 -07:00
parent 9a449e9c3b
commit 1e7c48fa9a
1 changed files with 2 additions and 1 deletions
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3
fs/f2fs/inode.c
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@ -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)