[PATCH] f2fs: remain written times to update inode during fsync

[Jaegeuk Kim]

This fixes xfstests/generic/392.

Signed-off-by: Jaegeuk Kim <jaeg...@kernel.org>
---
 fs/f2fs/f2fs.h  | 15 +++++++++++++++
 fs/f2fs/inode.c |  4 ++++
 2 files changed, 19 insertions(+)

diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 000f93f6767e..675c39d85111 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -664,6 +664,7 @@ struct f2fs_inode_info {
        kprojid_t i_projid;             /* id for project quota */
        int i_inline_xattr_size;        /* inline xattr size */
        struct timespec i_crtime;       /* inode creation time */
+       struct timespec i_disk_time[4]; /* inode disk times */
 };
 
 static inline void get_extent_info(struct extent_info *ext,
@@ -2457,6 +2458,11 @@ static inline void clear_file(struct inode *inode, int 
type)
        f2fs_mark_inode_dirty_sync(inode, true);
 }
 
+static inline bool time_equal(struct timespec a, struct timespec b)
+{
+       return (a.tv_sec == b.tv_sec) && (a.tv_nsec == b.tv_nsec);
+}
+
 static inline bool f2fs_skip_inode_update(struct inode *inode, int dsync)
 {
        bool ret;
@@ -2474,6 +2480,15 @@ static inline bool f2fs_skip_inode_update(struct inode 
*inode, int dsync)
                        i_size_read(inode) & ~PAGE_MASK)
                return false;
 
+       if (!time_equal(F2FS_I(inode)->i_disk_time[0], inode->i_atime))
+               return false;
+       if (!time_equal(F2FS_I(inode)->i_disk_time[1], inode->i_ctime))
+               return false;
+       if (!time_equal(F2FS_I(inode)->i_disk_time[2], inode->i_mtime))
+               return false;
+       if (!time_equal(F2FS_I(inode)->i_disk_time[3], F2FS_I(inode)->i_crtime))
+               return false;
+
        down_read(&F2FS_I(inode)->i_sem);
        ret = F2FS_I(inode)->last_disk_size == i_size_read(inode);
        up_read(&F2FS_I(inode)->i_sem);
diff --git a/fs/f2fs/inode.c b/fs/f2fs/inode.c
index 401f09ccce7e..70aba580f4b0 100644
--- a/fs/f2fs/inode.c
+++ b/fs/f2fs/inode.c
@@ -444,6 +444,10 @@ void update_inode(struct inode *inode, struct page 
*node_page)
        if (inode->i_nlink == 0)
                clear_inline_node(node_page);
 
+       F2FS_I(inode)->i_disk_time[0] = inode->i_atime;
+       F2FS_I(inode)->i_disk_time[1] = inode->i_ctime;
+       F2FS_I(inode)->i_disk_time[2] = inode->i_mtime;
+       F2FS_I(inode)->i_disk_time[3] = F2FS_I(inode)->i_crtime;
 }
 
 void update_inode_page(struct inode *inode)
-- 
2.15.0.531.g2ccb3012c9-goog