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Subject[PATCH 5.15 08/32] ovl: dont fail copy up if no fileattr support on upper
Date
From: Miklos Szeredi <mszeredi@redhat.com>

commit 94fd19752b28aa66c98e7991734af91dfc529f8f upstream.

Christoph Fritz is reporting that failure to copy up fileattr when upper
doesn't support fileattr or xattr results in a regression.

Return success in these failure cases; this reverts overlayfs to the old
behavior.

Add a pr_warn_once() in these cases to still let the user know about the
copy up failures.

Reported-by: Christoph Fritz <chf.fritz@googlemail.com>
Fixes: 72db82115d2b ("ovl: copy up sync/noatime fileattr flags")
Cc: <stable@vger.kernel.org> # v5.15
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
fs/overlayfs/copy_up.c | 12 +++++++++++-
1 file changed, 11 insertions(+), 1 deletion(-)

--- a/fs/overlayfs/copy_up.c
+++ b/fs/overlayfs/copy_up.c
@@ -157,7 +157,9 @@ static int ovl_copy_fileattr(struct inod
*/
if (oldfa.flags & OVL_PROT_FS_FLAGS_MASK) {
err = ovl_set_protattr(inode, new->dentry, &oldfa);
- if (err)
+ if (err == -EPERM)
+ pr_warn_once("copying fileattr: no xattr on upper\n");
+ else if (err)
return err;
}

@@ -167,6 +169,14 @@ static int ovl_copy_fileattr(struct inod

err = ovl_real_fileattr_get(new, &newfa);
if (err) {
+ /*
+ * Returning an error if upper doesn't support fileattr will
+ * result in a regression, so revert to the old behavior.
+ */
+ if (err == -ENOTTY || err == -EINVAL) {
+ pr_warn_once("copying fileattr: no support on upper\n");
+ return 0;
+ }
pr_warn("failed to retrieve upper fileattr (%pd2, err=%i)\n",
new, err);
return err;

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