From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wr1-f67.google.com ([209.85.221.67]:36366 "EHLO mail-wr1-f67.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727294AbeH0Qkz (ORCPT ); Mon, 27 Aug 2018 12:40:55 -0400 From: Amir Goldstein Subject: [PATCH v3 6/6] ovl: add ovl_fadvise() Date: Mon, 27 Aug 2018 15:56:04 +0300 Message-Id: <1535374564-8257-7-git-send-email-amir73il@gmail.com> In-Reply-To: <1535374564-8257-1-git-send-email-amir73il@gmail.com> References: <1535374564-8257-1-git-send-email-amir73il@gmail.com> Sender: linux-unionfs-owner@vger.kernel.org To: Miklos Szeredi Cc: Al Viro , Dave Chinner , linux-unionfs@vger.kernel.org, linux-fsdevel@vger.kernel.org List-ID: Implement stacked fadvise to fix syscalls readahead(2) and fadvise64(2) on an overlayfs file. Suggested-by: Miklos Szeredi Fixes: d1d04ef8572b ("ovl: stack file ops") Signed-off-by: Amir Goldstein --- 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