f2fs: clear FI_HOT_DATA correctly

This patch fixes to clear FI_HOT_DATA correctly in below path:
- error handling in f2fs_ioc_start_atomic_write
- after commit atomic write in f2fs_ioc_commit_atomic_write
- after drop atomic write in drop_inmem_pages
Signed-off-by: NChao Yu <yuchao0@huawei.com>
Signed-off-by: NJaegeuk Kim <jaegeuk@kernel.org>

fs/f2fs/file.c

@@ -1640,6 +1640,7 @@ static int f2fs_ioc_start_atomic_write(struct file *filp)
 	ret = filemap_write_and_wait_range(inode->i_mapping, 0, LLONG_MAX);
 	if (ret) {
 		clear_inode_flag(inode, FI_ATOMIC_FILE);
+		clear_inode_flag(inode, FI_HOT_DATA);
 		goto out;
 	}
 
@@ -1678,6 +1679,7 @@ static int f2fs_ioc_commit_atomic_write(struct file *filp)
 		ret = f2fs_do_sync_file(filp, 0, LLONG_MAX, 0, true);
 		if (!ret) {
 			clear_inode_flag(inode, FI_ATOMIC_FILE);
+			clear_inode_flag(inode, FI_HOT_DATA);
 			stat_dec_atomic_write(inode);
 		}
 	} else {

fs/f2fs/segment.c

@@ -255,6 +255,7 @@ void drop_inmem_pages(struct inode *inode)
 	mutex_unlock(&fi->inmem_lock);
 
 	clear_inode_flag(inode, FI_ATOMIC_FILE);
+	clear_inode_flag(inode, FI_HOT_DATA);
 	stat_dec_atomic_write(inode);
 }