The callback uses LOOKUPPARENT MDS request to find parent.
Signed-off-by: Yan, Zheng <zheng.z.yan@xxxxxxxxx>
---
fs/ceph/export.c | 44 ++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 44 insertions(+)
diff --git a/fs/ceph/export.c b/fs/ceph/export.c
index 017af26..817d370 100644
--- a/fs/ceph/export.c
+++ b/fs/ceph/export.c
@@ -139,8 +139,52 @@ static struct dentry *ceph_fh_to_parent(struct super_block *sb,
return __fh_to_dentry(sb, cfh->parent_ino);
}
+static struct dentry *ceph_get_parent(struct dentry *child)
+{
+ struct ceph_mds_client *mdsc;
+ struct ceph_mds_request *req;
+ struct inode *inode;
+ struct dentry *dentry;
+ int err;
+
+ /* don't re-export snaps */
+ if (ceph_snap(child->d_inode) != CEPH_NOSNAP)
+ return ERR_PTR(-EINVAL);
+
+ mdsc = ceph_inode_to_client(child->d_inode)->mdsc;
+ req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LOOKUPPARENT,
+ USE_ANY_MDS);
+ if (IS_ERR(req))
+ return ERR_CAST(req);
+
+ req->r_ino1 = ceph_vino(child->d_inode);
+ req->r_num_caps = 1;
+ err = ceph_mdsc_do_request(mdsc, NULL, req);
+ inode = req->r_target_inode;
+ if (inode)
+ ihold(inode);
+ ceph_mdsc_put_request(req);
+ if (!inode)
+ return ERR_PTR(-ESTALE);
+
+ dentry = d_obtain_alias(inode);
+ if (IS_ERR(dentry)) {
+ iput(inode);
+ return dentry;
+ }
+ err = ceph_init_dentry(dentry);
+ if (err < 0) {
+ dput(dentry);
+ return ERR_PTR(err);
+ }
+ dout("get_parent child %p parent %llx %p\n",
+ child, ceph_ino(inode), dentry);
+ return dentry;
+}
+
const struct export_operations ceph_export_ops = {
.encode_fh = ceph_encode_fh,
.fh_to_dentry = ceph_fh_to_dentry,
.fh_to_parent = ceph_fh_to_parent,
+ .get_parent = ceph_get_parent,
};
--
1.8.5.3
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