From mboxrd@z Thu Jan 1 00:00:00 1970 From: Amir Goldstein Subject: [PATCH v3 12/16] ovl: constant st_ino/st_dev across copy up Date: Thu, 27 Apr 2017 00:35:14 +0300 Message-ID: <1493242518-15266-13-git-send-email-amir73il@gmail.com> References: <1493242518-15266-1-git-send-email-amir73il@gmail.com> Return-path: Received: from mail-wr0-f193.google.com ([209.85.128.193]:36455 "EHLO mail-wr0-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1030876AbdDZVff (ORCPT ); Wed, 26 Apr 2017 17:35:35 -0400 In-Reply-To: <1493242518-15266-1-git-send-email-amir73il@gmail.com> Sender: linux-unionfs-owner@vger.kernel.org List-Id: linux-unionfs@vger.kernel.org To: Miklos Szeredi Cc: Vivek Goyal , Al Viro , linux-unionfs@vger.kernel.org, linux-fsdevel@vger.kernel.org When getting attributes for overlay inode of path type COPYUP, get the inode and dev numbers from the copy up origin inode. This results in constant and persistent st_ino/st_dev representation of files in overlay mount before and after copy up as well as after mount cycle. Signed-off-by: Amir Goldstein --- fs/overlayfs/inode.c | 14 ++++++++++++-- 1 file changed, 12 insertions(+), 2 deletions(-) diff --git a/fs/overlayfs/inode.c b/fs/overlayfs/inode.c index 17b8418..3615a52 100644 --- a/fs/overlayfs/inode.c +++ b/fs/overlayfs/inode.c @@ -60,15 +60,25 @@ int ovl_setattr(struct dentry *dentry, struct iattr *attr) static int ovl_getattr(const struct path *path, struct kstat *stat, u32 request_mask, unsigned int flags) { - struct dentry *dentry = path->dentry; + struct dentry *lower, *dentry = path->dentry; struct path realpath; const struct cred *old_cred; + enum ovl_path_type type; int err; - ovl_path_real(dentry, &realpath); + type = ovl_path_real(dentry, &realpath); old_cred = ovl_override_creds(dentry->d_sb); err = vfs_getattr(&realpath, stat, request_mask, flags); revert_creds(old_cred); + if (err) + return err; + + lower = ovl_dentry_lower(dentry); + if (OVL_TYPE_COPYUP(type) && lower) { + stat->dev = lower->d_sb->s_dev; + stat->ino = lower->d_inode->i_ino; + } + return err; } -- 2.7.4