ext4: start to support iopoll method

Since commit "b1b4705d54ab ext4: introduce direct I/O read using
iomap infrastructure", we can easily make ext4 support iopoll
method, just use iomap_dio_iopoll().

Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Xiaoguang Wang <xiaoguang.wang@linux.alibaba.com>
Link: https://lore.kernel.org/r/20200207120758.2411-1-xiaoguang.wang@linux.alibaba.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>

diff --git a/fs/ext4/file.c b/fs/ext4/file.c
index 5f225881176b93a3d50e3accc2ccaa07e46f605a..0d624250a62bfdfaef0cf0710ef22f139e65d076 100644 (file)
--- a/fs/ext4/file.c
+++ b/fs/ext4/file.c
@@ -872,6 +872,7 @@ const struct file_operations ext4_file_operations = {
        .llseek         = ext4_llseek,
        .read_iter      = ext4_file_read_iter,
        .write_iter     = ext4_file_write_iter,
+       .iopoll         = iomap_dio_iopoll,
        .unlocked_ioctl = ext4_ioctl,
 #ifdef CONFIG_COMPAT
        .compat_ioctl   = ext4_compat_ioctl,