Filesystems can implement their own flush method that release
resources, or manipulate caches. Currently if one of these
filesystems is used with overlayfs, the flush method is not called.
Signed-off-by: Sargun Dhillon <sargun@xxxxxxxxx>
Cc: linux-fsdevel@xxxxxxxxxxxxxxx
Cc: linux-unionfs@xxxxxxxxxxxxxxx
Cc: Miklos Szeredi <miklos@xxxxxxxxxx>
Cc: Amir Goldstein <amir73il@xxxxxxxxx>
---
fs/overlayfs/file.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/fs/overlayfs/file.c b/fs/overlayfs/file.c
index efccb7c1f9bc..802259f33c28 100644
--- a/fs/overlayfs/file.c
+++ b/fs/overlayfs/file.c
@@ -787,6 +787,16 @@ static loff_t ovl_remap_file_range(struct file *file_in, loff_t pos_in,
remap_flags, op);
}
+static int ovl_flush(struct file *file, fl_owner_t id)
+{
+ struct file *realfile = file->private_data;
+
+ if (realfile->f_op->flush)
+ return realfile->f_op->flush(realfile, id);
+
+ return 0;
+}
+
const struct file_operations ovl_file_operations = {
.open = ovl_open,
.release = ovl_release,
@@ -798,6 +808,7 @@ const struct file_operations ovl_file_operations = {
.fallocate = ovl_fallocate,
.fadvise = ovl_fadvise,
.unlocked_ioctl = ovl_ioctl,
+ .flush = ovl_flush,
#ifdef CONFIG_COMPAT
.compat_ioctl = ovl_compat_ioctl,
#endif
--
2.25.1
