From mboxrd@z Thu Jan 1 00:00:00 1970 From: Vivek Goyal Subject: [PATCH 3/7] ovl: Copy up only metadata during copy up where it makes sense Date: Mon, 2 Oct 2017 09:40:01 -0400 Message-ID: <1506951605-31440-4-git-send-email-vgoyal@redhat.com> References: <1506951605-31440-1-git-send-email-vgoyal@redhat.com> Return-path: Received: from mx1.redhat.com ([209.132.183.28]:48204 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751067AbdJBNkO (ORCPT ); Mon, 2 Oct 2017 09:40:14 -0400 In-Reply-To: <1506951605-31440-1-git-send-email-vgoyal@redhat.com> Sender: linux-unionfs-owner@vger.kernel.org List-Id: linux-unionfs@vger.kernel.org To: linux-unionfs@vger.kernel.org Cc: amir73il@gmail.com, miklos@szeredi.hu, vgoyal@redhat.com If it makes sense to copy up only metadata during copy up, do it. This is done for regular files which are not opened for WRITE and have origin being saved. Signed-off-by: Vivek Goyal --- fs/overlayfs/copy_up.c | 27 +++++++++++++++++++-------- 1 file changed, 19 insertions(+), 8 deletions(-) diff --git a/fs/overlayfs/copy_up.c b/fs/overlayfs/copy_up.c index cdc4d79a1249..b2d9ed81e9ff 100644 --- a/fs/overlayfs/copy_up.c +++ b/fs/overlayfs/copy_up.c @@ -306,11 +306,8 @@ static int ovl_set_origin(struct dentry *dentry, struct dentry *lower, return PTR_ERR(fh); } - /* - * Do not fail when upper doesn't support xattrs. - */ err = ovl_check_setxattr(dentry, upper, OVL_XATTR_ORIGIN, fh, - fh ? fh->len : 0, 0); + fh ? fh->len : 0, -EOPNOTSUPP); kfree(fh); return err; @@ -328,6 +325,7 @@ struct ovl_copy_up_ctx { struct dentry *workdir; bool tmpfile; bool origin; + bool metadata_only; }; static int ovl_link_up(struct ovl_copy_up_ctx *c) @@ -464,11 +462,15 @@ static int ovl_copy_up_inode(struct ovl_copy_up_ctx *c, struct dentry *temp) */ if (c->origin) { err = ovl_set_origin(c->dentry, c->lowerpath.dentry, temp); - if (err) - return err; + if (err) { + if (err != -EOPNOTSUPP) + return err; + /* Upper does not support xattr. Copy up data as well */ + c->metadata_only = false; + } } - if (S_ISREG(c->stat.mode)) { + if (S_ISREG(c->stat.mode) && !c->metadata_only) { struct path upperpath; ovl_path_upper(c->dentry, &upperpath); @@ -596,6 +598,7 @@ static int ovl_copy_up_one(struct dentry *parent, struct dentry *dentry, .dentry = dentry, .workdir = ovl_workdir(dentry), .origin = true, + .metadata_only = true, }; if (WARN_ON(!ctx.workdir)) @@ -616,9 +619,17 @@ static int ovl_copy_up_one(struct dentry *parent, struct dentry *dentry, if (err) return err; + if (!S_ISREG(ctx.stat.mode)) + ctx.metadata_only = false; + /* maybe truncate regular file. this has no effect on dirs */ - if (flags & O_TRUNC) + if (flags & O_TRUNC) { ctx.stat.size = 0; + ctx.metadata_only = false; + } + + if (flags & (OPEN_FMODE(flags) & FMODE_WRITE)) + ctx.metadata_only = false; if (S_ISLNK(ctx.stat.mode)) { ctx.link = vfs_get_link(ctx.lowerpath.dentry, &done); -- 2.13.5