Commit 9017c2ec authored by Yan, Zheng's avatar Yan, Zheng
Browse files

ceph: add get_parent() NFS export callback 



The callback uses LOOKUPPARENT MDS request to find parent.

Signed-off-by: default avatarYan, Zheng <zheng.z.yan@intel.com>
Reviewed-by: default avatarSage Weil <sage@inktank.com>
parent 4f32b42d

fs/ceph/export.c

+60 −0
Original line number Diff line number Diff line
@@ -121,6 +121,65 @@ 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,

				   struct dentry *child, 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);



	if (child) {

		req->r_inode = child->d_inode;

		ihold(child->d_inode);

	} else {

		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",

	     child ? ceph_ino(child->d_inode) : 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, child, 0);

}



/*

 * get parent, if possible.

 *
@@ -171,4 +230,5 @@ 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,

};