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Commit 9020df37 authored by Miklos Szeredi's avatar Miklos Szeredi
Browse files

ovl: compare inodes 



When checking for consistency in directory operations (unlink, rename,
etc.) match inodes not dentries.

Signed-off-by: default avatarMiklos Szeredi <mszeredi@redhat.com>
parent 25b7713a

fs/overlayfs/dir.c

+9 −4
Original line number Diff line number Diff line
@@ -611,6 +611,11 @@ static int ovl_link(struct dentry *old, struct inode *newdir, 
	return err;

}



static bool ovl_matches_upper(struct dentry *dentry, struct dentry *upper)

{

	return d_inode(ovl_dentry_upper(dentry)) == d_inode(upper);

}



static int ovl_remove_and_whiteout(struct dentry *dentry, bool is_dir)

{

	struct dentry *workdir = ovl_workdir(dentry);
@@ -646,7 +651,7 @@ static int ovl_remove_and_whiteout(struct dentry *dentry, bool is_dir) 
	err = -ESTALE;

	if ((opaquedir && upper != opaquedir) ||

	    (!opaquedir && ovl_dentry_upper(dentry) &&

	     upper != ovl_dentry_upper(dentry))) {

	     !ovl_matches_upper(dentry, upper))) {

		goto out_dput_upper;

	}
@@ -707,7 +712,7 @@ static int ovl_remove_upper(struct dentry *dentry, bool is_dir) 


	err = -ESTALE;

	if ((opaquedir && upper != opaquedir) ||

	    (!opaquedir && upper != ovl_dentry_upper(dentry)))

	    (!opaquedir && !ovl_matches_upper(dentry, upper)))

		goto out_dput_upper;



	if (is_dir)
@@ -985,7 +990,7 @@ static int ovl_rename(struct inode *olddir, struct dentry *old, 
		goto out_unlock;



	err = -ESTALE;

	if (olddentry != ovl_dentry_upper(old))

	if (!ovl_matches_upper(old, olddentry))

		goto out_dput_old;



	newdentry = lookup_one_len(new->d_name.name, new_upperdir,
@@ -1003,7 +1008,7 @@ static int ovl_rename(struct inode *olddir, struct dentry *old, 
			if (newdentry != opaquedir)

				goto out_dput;

		} else {

			if (newdentry != ovl_dentry_upper(new))

			if (!ovl_matches_upper(new, newdentry))

				goto out_dput;

		}

	} else {