[PATCH 7/8] f2fs: fix to update largest extent under lock

Chao Yu
2016-10-11T15:01:57Z

In order to avoid racing problem, make largest extent cache being updated
under lock.

Signed-off-by: Chao Yu <yuchao0@huawei.com>
---
fs/f2fs/inode.c | 11 +++++++----
1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/fs/f2fs/inode.c b/fs/f2fs/inode.c
index 34ae03c..d9cd458 100644
--- a/fs/f2fs/inode.c
+++ b/fs/f2fs/inode.c
@@ -252,6 +252,7 @@ retry:
int update_inode(struct inode *inode, struct page *node_page)
{
struct f2fs_inode *ri;
+ struct extent_tree *et = F2FS_I(inode)->extent_tree;

f2fs_inode_synced(inode);

@@ -267,11 +268,13 @@ int update_inode(struct inode *inode, struct page *node_page)
ri->i_size = cpu_to_le64(i_size_read(inode));
ri->i_blocks = cpu_to_le64(inode->i_blocks);

- if (F2FS_I(inode)->extent_tree)
- set_raw_extent(&F2FS_I(inode)->extent_tree->largest,
- &ri->i_ext);
- else
+ if (et) {
+ read_lock(&et->lock);
+ set_raw_extent(&et->largest, &ri->i_ext);
+ read_unlock(&et->lock);
+ } else {
memset(&ri->i_ext, 0, sizeof(ri->i_ext));
+ }
set_raw_inline(inode, ri);

ri->i_atime = cpu_to_le64(inode->i_atime.tv_sec);
--
2.10.1