Implement stacked fadvise to fix syscalls readahead(2) and fadvise64(2)
on an overlayfs file.
Suggested-by: Miklos Szeredi <mszeredi@xxxxxxxxxx>
Fixes: d1d04ef8572b ("ovl: stack file ops")
Signed-off-by: Amir Goldstein <amir73il@xxxxxxxxx>
---
fs/overlayfs/file.c | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
diff --git a/fs/overlayfs/file.c b/fs/overlayfs/file.c
index a4acd84591d4..42d2d034d85c 100644
--- a/fs/overlayfs/file.c
+++ b/fs/overlayfs/file.c
@@ -331,6 +331,23 @@ static long ovl_fallocate(struct file *file, int mode, loff_t offset, loff_t len
return ret;
}
+int ovl_fadvise(struct file *file, loff_t offset, loff_t len, int advice)
+{
+ struct fd real;
+ int ret;
+
+ ret = ovl_real_fdget(file, &real);
+ if (ret)
+ return ret;
+
+ /* XXX: do we need mounter credentials? */
+ ret = vfs_fadvise(real.file, offset, len, advice);
+
+ fdput(real);
+
+ return ret;
+}
+
static long ovl_real_ioctl(struct file *file, unsigned int cmd,
unsigned long arg)
{
@@ -499,6 +516,7 @@ const struct file_operations ovl_file_operations = {
.fsync = ovl_fsync,
.mmap = ovl_mmap,
.fallocate = ovl_fallocate,
+ .fadvise = ovl_fadvise,
.unlocked_ioctl = ovl_ioctl,
.compat_ioctl = ovl_compat_ioctl,
--
2.7.4
