The callback uses LOOKUPPARENT MDS request to find parent.
Signed-off-by: Yan, Zheng <zheng.z.yan@xxxxxxxxx>
---
fs/ceph/export.c | 53 +++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 53 insertions(+)
diff --git a/fs/ceph/export.c b/fs/ceph/export.c
index 976d341..3794255 100644
--- a/fs/ceph/export.c
+++ b/fs/ceph/export.c
@@ -121,6 +121,58 @@ static struct dentry *ceph_fh_to_dentry(struct super_block *sb,
return __fh_to_dentry(sb, fh->ino);
}
+static struct dentry *__get_parent(struct super_block *sb, u64 ino)
+{
+ struct ceph_mds_client *mdsc = ceph_sb_to_client(sb)->mdsc;
+ struct ceph_mds_request *req;
+ struct inode *inode;
+ struct dentry *dentry;
+ int err;
+
+ req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LOOKUPPARENT,
+ USE_ANY_MDS);
+ if (IS_ERR(req))
+ return ERR_CAST(req);
+
+ req->r_ino1 = (struct ceph_vino) {
+ .ino = ino,
+ .snap = CEPH_NOSNAP,
+ };
+ 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(-ENOENT);
+
+ 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 ino %llx parent %p ino %llx.%llx\n",
+ ino, dentry, ceph_vinop(inode));
+ return dentry;
+}
+
+struct dentry *ceph_get_parent(struct dentry *child)
+{
+ /* don't re-export snaps */
+ if (ceph_snap(child->d_inode) != CEPH_NOSNAP)
+ return ERR_PTR(-EINVAL);
+
+ dout("get_parent %p ino %llx.%llx\n",
+ child, ceph_vinop(child->d_inode));
+ return __get_parent(child->d_sb, ceph_ino(child->d_inode));
+}
+
/*
* get parent, if possible.
*
@@ -171,4 +223,5 @@ 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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