f2fs: fix to recover data written by dio

If data are overwritten through dio, previous f2fs doesn't remain the fsync mark
due to no additional node writes.

Note that this patch should resolve the xfstests:311.

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

3 files changed, 16 insertions, 0 deletions

diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 8c250a5d6f26..39fe7d70791a 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -1041,6 +1041,9 @@ static ssize_t f2fs_direct_IO(int rw, struct kiocb *iocb,
         if (check_direct_IO(inode, rw, iov, offset, nr_segs))
                 return 0;
 
+        /* clear fsync mark to recover these blocks */
+        fsync_mark_clear(F2FS_SB(inode->i_sb), inode->i_ino);
+
         return blockdev_direct_IO(rw, iocb, inode, iov, offset, nr_segs,
                                                         get_data_block);
 }
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 9684b1f77a7d..f628c3c5e63f 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -1168,6 +1168,7 @@ struct node_info;
 bool available_free_memory(struct f2fs_sb_info *, int);
 int is_checkpointed_node(struct f2fs_sb_info *, nid_t);
 bool fsync_mark_done(struct f2fs_sb_info *, nid_t);
+void fsync_mark_clear(struct f2fs_sb_info *, nid_t);
 void get_node_info(struct f2fs_sb_info *, nid_t, struct node_info *);
 int get_dnode_of_data(struct dnode_of_data *, pgoff_t, int);
 int truncate_inode_blocks(struct inode *, pgoff_t);
diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
index 02a59e9027b1..a0a1f25ed20f 100644
--- a/fs/f2fs/node.c
+++ b/fs/f2fs/node.c
@@ -153,6 +153,18 @@ bool fsync_mark_done(struct f2fs_sb_info *sbi, nid_t nid)
         return fsync_done;
 }
 
+void fsync_mark_clear(struct f2fs_sb_info *sbi, nid_t nid)
+{
+        struct f2fs_nm_info *nm_i = NM_I(sbi);
+        struct nat_entry *e;
+
+        write_lock(&nm_i->nat_tree_lock);
+        e = __lookup_nat_cache(nm_i, nid);
+        if (e)
+                e->fsync_done = false;
+        write_unlock(&nm_i->nat_tree_lock);
+}
+
 static struct nat_entry *grab_nat_entry(struct f2fs_nm_info *nm_i, nid_t nid)
 {
         struct nat_entry *new;