summaryrefslogtreecommitdiff
path: root/fs/overlayfs/file.c
diff options
context:
space:
mode:
Diffstat (limited to 'fs/overlayfs/file.c')
-rw-r--r--fs/overlayfs/file.c21
1 files changed, 21 insertions, 0 deletions
diff --git a/fs/overlayfs/file.c b/fs/overlayfs/file.c
index c144183a7e09..4d53d3b7e5fe 100644
--- a/fs/overlayfs/file.c
+++ b/fs/overlayfs/file.c
@@ -571,6 +571,26 @@ 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 fd real;
+ const struct cred *old_cred;
+ int err;
+
+ err = ovl_real_fdget(file, &real);
+ if (err)
+ return err;
+
+ if (real.file->f_op->flush) {
+ old_cred = ovl_override_creds(file_inode(file)->i_sb);
+ err = real.file->f_op->flush(real.file, id);
+ revert_creds(old_cred);
+ }
+ fdput(real);
+
+ return err;
+}
+
const struct file_operations ovl_file_operations = {
.open = ovl_open,
.release = ovl_release,
@@ -581,6 +601,7 @@ const struct file_operations ovl_file_operations = {
.mmap = ovl_mmap,
.fallocate = ovl_fallocate,
.fadvise = ovl_fadvise,
+ .flush = ovl_flush,
.splice_read = generic_file_splice_read,
.splice_write = iter_file_splice_write,