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Commit 2c3d7358 authored by Vivek Goyal's avatar Vivek Goyal Committed by Miklos Szeredi
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ovl: Do not expose metacopy only dentry from d_real() 



Metacopy dentry/inode is internal to overlay and is never exposed outside
of it.  Exception is metacopy upper file used for fsync().  Modify d_real()
to look for dentries/inode which have data, but also allow matching upper
inode without data for the fsync case.

Signed-off-by: default avatarVivek Goyal <vgoyal@redhat.com>
Reviewed-by: default avatarAmir Goldstein <amir73il@gmail.com>
Signed-off-by: default avatarMiklos Szeredi <mszeredi@redhat.com>
parent 8c444d2a

fs/overlayfs/super.c

+5 −2
Original line number Diff line number Diff line
@@ -95,10 +95,13 @@ static struct dentry *ovl_d_real(struct dentry *dentry, 
	}



	real = ovl_dentry_upper(dentry);

	if (real && (!inode || inode == d_inode(real)))

	if (real && (inode == d_inode(real)))

		return real;



	real = ovl_dentry_lower(dentry);

	if (real && !inode && ovl_has_upperdata(d_inode(dentry)))

		return real;



	real = ovl_dentry_lowerdata(dentry);

	if (!real)

		goto bug;