[mirror_ubuntu-bionic-kernel.git] / drivers / staging / lustre / lustre / llite / llite_nfs.c

/*
 * GPL HEADER START
 *
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 only,
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License version 2 for more details (a copy is included
 * in the LICENSE file that accompanied this code).
 *
 * You should have received a copy of the GNU General Public License
 * version 2 along with this program; If not, see
 * http://www.gnu.org/licenses/gpl-2.0.html
 *
 * GPL HEADER END
 */
/*
 * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
 * Use is subject to license terms.
 *
 * Copyright (c) 2011, 2012, Intel Corporation.
 */
/*
 * This file is part of Lustre, http://www.lustre.org/
 * Lustre is a trademark of Sun Microsystems, Inc.
 *
 * lustre/lustre/llite/llite_nfs.c
 *
 * NFS export of Lustre Light File System
 *
 * Author: Yury Umanets <umka@clusterfs.com>
 * Author: Huang Hua <huanghua@clusterfs.com>
 */

#define DEBUG_SUBSYSTEM S_LLITE
#include "../include/lustre_lite.h"
#include "llite_internal.h"
#include <linux/exportfs.h>

__u32 get_uuid2int(const char *name, int len)
{
	__u32 key0 = 0x12a3fe2d, key1 = 0x37abe8f9;

	while (len--) {
		__u32 key = key1 + (key0 ^ (*name++ * 7152373));

		if (key & 0x80000000)
			key -= 0x7fffffff;
		key1 = key0;
		key0 = key;
	}
	return (key0 << 1);
}

void get_uuid2fsid(const char *name, int len, __kernel_fsid_t *fsid)
{
	__u64 key = 0, key0 = 0x12a3fe2d, key1 = 0x37abe8f9;

	while (len--) {
		key = key1 + (key0 ^ (*name++ * 7152373));
		if (key & 0x8000000000000000ULL)
			key -= 0x7fffffffffffffffULL;
		key1 = key0;
		key0 = key;
	}

	fsid->val[0] = key;
	fsid->val[1] = key >> 32;
}

static int ll_nfs_test_inode(struct inode *inode, void *opaque)
{
	return lu_fid_eq(&ll_i2info(inode)->lli_fid, opaque);
}

struct inode *search_inode_for_lustre(struct super_block *sb,
				      const struct lu_fid *fid)
{
	struct ll_sb_info     *sbi = ll_s2sbi(sb);
	struct ptlrpc_request *req = NULL;
	struct inode	  *inode = NULL;
	int		   eadatalen = 0;
	unsigned long	      hash = cl_fid_build_ino(fid,
						      ll_need_32bit_api(sbi));
	struct  md_op_data    *op_data;
	int		   rc;

	CDEBUG(D_INFO, "searching inode for:(%lu,"DFID")\n", hash, PFID(fid));

	inode = ilookup5(sb, hash, ll_nfs_test_inode, (void *)fid);
	if (inode)
		return inode;

	rc = ll_get_default_mdsize(sbi, &eadatalen);
	if (rc)
		return ERR_PTR(rc);

	/* Because inode is NULL, ll_prep_md_op_data can not
	 * be used here. So we allocate op_data ourselves
	 */
	op_data = kzalloc(sizeof(*op_data), GFP_NOFS);
	if (!op_data)
		return ERR_PTR(-ENOMEM);

	op_data->op_fid1 = *fid;
	op_data->op_mode = eadatalen;
	op_data->op_valid = OBD_MD_FLEASIZE;

	/* mds_fid2dentry ignores f_type */
	rc = md_getattr(sbi->ll_md_exp, op_data, &req);
	kfree(op_data);
	if (rc) {
		CDEBUG(D_INFO, "can't get object attrs, fid "DFID", rc %d\n",
		       PFID(fid), rc);
		return ERR_PTR(rc);
	}
	rc = ll_prep_inode(&inode, req, sb, NULL);
	ptlrpc_req_finished(req);
	if (rc)
		return ERR_PTR(rc);

	return inode;
}

struct lustre_nfs_fid {
	struct lu_fid   lnf_child;
	struct lu_fid   lnf_parent;
};

static struct dentry *
ll_iget_for_nfs(struct super_block *sb, struct lu_fid *fid, struct lu_fid *parent)
{
	struct inode  *inode;
	struct dentry *result;

	if (!fid_is_sane(fid))
		return ERR_PTR(-ESTALE);

	CDEBUG(D_INFO, "Get dentry for fid: " DFID "\n", PFID(fid));

	inode = search_inode_for_lustre(sb, fid);
	if (IS_ERR(inode))
		return ERR_CAST(inode);

	if (is_bad_inode(inode)) {
		/* we didn't find the right inode.. */
		iput(inode);
		return ERR_PTR(-ESTALE);
	}

	/**
	 * It is an anonymous dentry without OST objects created yet.
	 * We have to find the parent to tell MDS how to init lov objects.
	 */
	if (S_ISREG(inode->i_mode) && !ll_i2info(inode)->lli_has_smd &&
	    parent && !fid_is_zero(parent)) {
		struct ll_inode_info *lli = ll_i2info(inode);

		spin_lock(&lli->lli_lock);
		lli->lli_pfid = *parent;
		spin_unlock(&lli->lli_lock);
	}

	/* N.B. d_obtain_alias() drops inode ref on error */
	result = d_obtain_alias(inode);

	return result;
}

/**
 * \a connectable - is nfsd will connect himself or this should be done
 *		  at lustre
 *
 * The return value is file handle type:
 * 1 -- contains child file handle;
 * 2 -- contains child file handle and parent file handle;
 * 255 -- error.
 */
static int ll_encode_fh(struct inode *inode, __u32 *fh, int *plen,
			struct inode *parent)
{
	int fileid_len = sizeof(struct lustre_nfs_fid) / 4;
	struct lustre_nfs_fid *nfs_fid = (void *)fh;

	CDEBUG(D_INFO, "%s: encoding for ("DFID") maxlen=%d minlen=%d\n",
	       ll_get_fsname(inode->i_sb, NULL, 0),
	       PFID(ll_inode2fid(inode)), *plen, fileid_len);

	if (*plen < fileid_len) {
		*plen = fileid_len;
		return FILEID_INVALID;
	}

	nfs_fid->lnf_child = *ll_inode2fid(inode);
	if (parent)
		nfs_fid->lnf_parent = *ll_inode2fid(parent);
	else
		fid_zero(&nfs_fid->lnf_parent);
	*plen = fileid_len;

	return FILEID_LUSTRE;
}

static int ll_nfs_get_name_filldir(struct dir_context *ctx, const char *name,
				   int namelen, loff_t hash, u64 ino,
				   unsigned type)
{
	/* It is hack to access lde_fid for comparison with lgd_fid.
	 * So the input 'name' must be part of the 'lu_dirent'.
	 */
	struct lu_dirent *lde = container_of0(name, struct lu_dirent, lde_name);
	struct ll_getname_data *lgd =
		container_of(ctx, struct ll_getname_data, ctx);
	struct lu_fid fid;

	fid_le_to_cpu(&fid, &lde->lde_fid);
	if (lu_fid_eq(&fid, &lgd->lgd_fid)) {
		memcpy(lgd->lgd_name, name, namelen);
		lgd->lgd_name[namelen] = 0;
		lgd->lgd_found = 1;
	}
	return lgd->lgd_found;
}

static int ll_get_name(struct dentry *dentry, char *name,
		       struct dentry *child)
{
	struct inode *dir = d_inode(dentry);
	int rc;
	struct ll_getname_data lgd = {
		.lgd_name = name,
		.lgd_fid = ll_i2info(d_inode(child))->lli_fid,
		.ctx.actor = ll_nfs_get_name_filldir,
	};

	if (!dir || !S_ISDIR(dir->i_mode)) {
		rc = -ENOTDIR;
		goto out;
	}

	if (!dir->i_fop) {
		rc = -EINVAL;
		goto out;
	}

	inode_lock(dir);
	rc = ll_dir_read(dir, &lgd.ctx);
	inode_unlock(dir);
	if (!rc && !lgd.lgd_found)
		rc = -ENOENT;
out:
	return rc;
}

static struct dentry *ll_fh_to_dentry(struct super_block *sb, struct fid *fid,
				      int fh_len, int fh_type)
{
	struct lustre_nfs_fid *nfs_fid = (struct lustre_nfs_fid *)fid;

	if (fh_type != FILEID_LUSTRE)
		return ERR_PTR(-EPROTO);

	return ll_iget_for_nfs(sb, &nfs_fid->lnf_child, &nfs_fid->lnf_parent);
}

static struct dentry *ll_fh_to_parent(struct super_block *sb, struct fid *fid,
				      int fh_len, int fh_type)
{
	struct lustre_nfs_fid *nfs_fid = (struct lustre_nfs_fid *)fid;

	if (fh_type != FILEID_LUSTRE)
		return ERR_PTR(-EPROTO);

	return ll_iget_for_nfs(sb, &nfs_fid->lnf_parent, NULL);
}

static struct dentry *ll_get_parent(struct dentry *dchild)
{
	struct ptlrpc_request *req = NULL;
	struct inode	  *dir = d_inode(dchild);
	struct ll_sb_info     *sbi;
	struct dentry	 *result = NULL;
	struct mdt_body       *body;
	static char	   dotdot[] = "..";
	struct md_op_data     *op_data;
	int		   rc;
	int		      lmmsize;

	LASSERT(dir && S_ISDIR(dir->i_mode));

	sbi = ll_s2sbi(dir->i_sb);

	CDEBUG(D_INFO, "%s: getting parent for ("DFID")\n",
	       ll_get_fsname(dir->i_sb, NULL, 0),
	       PFID(ll_inode2fid(dir)));

	rc = ll_get_default_mdsize(sbi, &lmmsize);
	if (rc != 0)
		return ERR_PTR(rc);

	op_data = ll_prep_md_op_data(NULL, dir, NULL, dotdot,
				     strlen(dotdot), lmmsize,
				     LUSTRE_OPC_ANY, NULL);
	if (IS_ERR(op_data))
		return (void *)op_data;

	rc = md_getattr_name(sbi->ll_md_exp, op_data, &req);
	ll_finish_md_op_data(op_data);
	if (rc) {
		CERROR("%s: failure inode "DFID" get parent: rc = %d\n",
		       ll_get_fsname(dir->i_sb, NULL, 0),
		       PFID(ll_inode2fid(dir)), rc);
		return ERR_PTR(rc);
	}
	body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY);
	/*
	 * LU-3952: MDT may lost the FID of its parent, we should not crash
	 * the NFS server, ll_iget_for_nfs() will handle the error.
	 */
	if (body->valid & OBD_MD_FLID) {
		CDEBUG(D_INFO, "parent for " DFID " is " DFID "\n",
		       PFID(ll_inode2fid(dir)), PFID(&body->fid1));
	}
	result = ll_iget_for_nfs(dir->i_sb, &body->fid1, NULL);

	ptlrpc_req_finished(req);
	return result;
}

const struct export_operations lustre_export_operations = {
	.get_parent = ll_get_parent,
	.encode_fh  = ll_encode_fh,
	.get_name   = ll_get_name,
	.fh_to_dentry = ll_fh_to_dentry,
	.fh_to_parent = ll_fh_to_parent,
};
Commit	Line	Data
d7e09d03 PT	1	/*
	2	* GPL HEADER START
	3	*
	4	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License version 2 only,
	8	* as published by the Free Software Foundation.
	9	*
	10	* This program is distributed in the hope that it will be useful, but
	11	* WITHOUT ANY WARRANTY; without even the implied warranty of
	12	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	13	* General Public License version 2 for more details (a copy is included
	14	* in the LICENSE file that accompanied this code).
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* version 2 along with this program; If not, see
6a5b99a4	18	* http://www.gnu.org/licenses/gpl-2.0.html
d7e09d03	19	*
d7e09d03 PT	20	* GPL HEADER END
	21	*/
	22	/*
	23	* Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
	24	* Use is subject to license terms.
	25	*
	26	* Copyright (c) 2011, 2012, Intel Corporation.
	27	*/
	28	/*
	29	* This file is part of Lustre, http://www.lustre.org/
	30	* Lustre is a trademark of Sun Microsystems, Inc.
	31	*
	32	* lustre/lustre/llite/llite_nfs.c
	33	*
	34	* NFS export of Lustre Light File System
	35	*
	36	* Author: Yury Umanets <umka@clusterfs.com>
	37	* Author: Huang Hua <huanghua@clusterfs.com>
	38	*/
	39
	40	#define DEBUG_SUBSYSTEM S_LLITE
67a235f5	41	#include "../include/lustre_lite.h"
d7e09d03 PT	42	#include "llite_internal.h"
	43	#include <linux/exportfs.h>
	44
	45	__u32 get_uuid2int(const char *name, int len)
	46	{
	47	__u32 key0 = 0x12a3fe2d, key1 = 0x37abe8f9;
50ffcb7e	48
d7e09d03 PT	49	while (len--) {
d7e09d03 PT	50	__u32 key = key1 + (key0 ^ (name++ 7152373));
5b39bd5f JP	51
	52	if (key & 0x80000000)
	53	key -= 0x7fffffff;
d7e09d03 PT	54	key1 = key0;
	55	key0 = key;
	56	}
	57	return (key0 << 1);
	58	}
	59
bd994071 FY	60	void get_uuid2fsid(const char name, int len, __kernel_fsid_t fsid)
	61	{
	62	__u64 key = 0, key0 = 0x12a3fe2d, key1 = 0x37abe8f9;
	63
	64	while (len--) {
	65	key = key1 + (key0 ^ (name++ 7152373));
	66	if (key & 0x8000000000000000ULL)
	67	key -= 0x7fffffffffffffffULL;
	68	key1 = key0;
	69	key0 = key;
	70	}
	71
	72	fsid->val[0] = key;
	73	fsid->val[1] = key >> 32;
	74	}
	75
d7e09d03 PT	76	static int ll_nfs_test_inode(struct inode inode, void opaque)
d7e09d03 PT	77	{
3e127cbb	78	return lu_fid_eq(&ll_i2info(inode)->lli_fid, opaque);
d7e09d03 PT	79	}
	80
	81	struct inode search_inode_for_lustre(struct super_block sb,
	82	const struct lu_fid *fid)
	83	{
	84	struct ll_sb_info *sbi = ll_s2sbi(sb);
	85	struct ptlrpc_request *req = NULL;
	86	struct inode *inode = NULL;
	87	int eadatalen = 0;
	88	unsigned long hash = cl_fid_build_ino(fid,
	89	ll_need_32bit_api(sbi));
	90	struct md_op_data *op_data;
	91	int rc;
d7e09d03 PT	92
	93	CDEBUG(D_INFO, "searching inode for:(%lu,"DFID")\n", hash, PFID(fid));
	94
	95	inode = ilookup5(sb, hash, ll_nfs_test_inode, (void *)fid);
	96	if (inode)
0a3bdb00	97	return inode;
d7e09d03	98
44779340	99	rc = ll_get_default_mdsize(sbi, &eadatalen);
d7e09d03	100	if (rc)
0a3bdb00	101	return ERR_PTR(rc);
d7e09d03 PT	102
d7e09d03 PT	103	/* Because inode is NULL, ll_prep_md_op_data can not
c0894c6c OD	104	* be used here. So we allocate op_data ourselves
c0894c6c OD	105	*/
496a51bd JL	106	op_data = kzalloc(sizeof(*op_data), GFP_NOFS);
496a51bd JL	107	if (!op_data)
d7e09d03 PT	108	return ERR_PTR(-ENOMEM);
	109
	110	op_data->op_fid1 = *fid;
	111	op_data->op_mode = eadatalen;
	112	op_data->op_valid = OBD_MD_FLEASIZE;
	113
	114	/* mds_fid2dentry ignores f_type */
	115	rc = md_getattr(sbi->ll_md_exp, op_data, &req);
97903a26	116	kfree(op_data);
d7e09d03	117	if (rc) {
ac7af34e	118	CDEBUG(D_INFO, "can't get object attrs, fid "DFID", rc %d\n",
d7e09d03	119	PFID(fid), rc);
0a3bdb00	120	return ERR_PTR(rc);
d7e09d03 PT	121	}
	122	rc = ll_prep_inode(&inode, req, sb, NULL);
	123	ptlrpc_req_finished(req);
	124	if (rc)
0a3bdb00	125	return ERR_PTR(rc);
d7e09d03	126
0a3bdb00	127	return inode;
d7e09d03 PT	128	}
	129
	130	struct lustre_nfs_fid {
	131	struct lu_fid lnf_child;
	132	struct lu_fid lnf_parent;
	133	};
	134
	135	static struct dentry *
	136	ll_iget_for_nfs(struct super_block sb, struct lu_fid fid, struct lu_fid *parent)
	137	{
	138	struct inode *inode;
	139	struct dentry *result;
d7e09d03	140
d7e09d03	141	if (!fid_is_sane(fid))
0a3bdb00	142	return ERR_PTR(-ESTALE);
d7e09d03	143
cb776592 DE	144	CDEBUG(D_INFO, "Get dentry for fid: " DFID "\n", PFID(fid));
cb776592 DE	145
d7e09d03 PT	146	inode = search_inode_for_lustre(sb, fid);
d7e09d03 PT	147	if (IS_ERR(inode))
0a3bdb00	148	return ERR_CAST(inode);
d7e09d03 PT	149
	150	if (is_bad_inode(inode)) {
	151	/* we didn't find the right inode.. */
	152	iput(inode);
0a3bdb00	153	return ERR_PTR(-ESTALE);
d7e09d03 PT	154	}
	155
	156	/**
	157	* It is an anonymous dentry without OST objects created yet.
	158	* We have to find the parent to tell MDS how to init lov objects.
	159	*/
	160	if (S_ISREG(inode->i_mode) && !ll_i2info(inode)->lli_has_smd &&
cb776592	161	parent && !fid_is_zero(parent)) {
d7e09d03 PT	162	struct ll_inode_info *lli = ll_i2info(inode);
	163
	164	spin_lock(&lli->lli_lock);
	165	lli->lli_pfid = *parent;
	166	spin_unlock(&lli->lli_lock);
	167	}
	168
7f830d8d	169	/* N.B. d_obtain_alias() drops inode ref on error */
d7e09d03	170	result = d_obtain_alias(inode);
d7e09d03	171
0a3bdb00	172	return result;
d7e09d03 PT	173	}
d7e09d03 PT	174
d7e09d03 PT	175	/**
	176	* \a connectable - is nfsd will connect himself or this should be done
	177	* at lustre
	178	*
	179	* The return value is file handle type:
	180	* 1 -- contains child file handle;
	181	* 2 -- contains child file handle and parent file handle;
	182	* 255 -- error.
	183	*/
	184	static int ll_encode_fh(struct inode inode, __u32 fh, int *plen,
	185	struct inode *parent)
	186	{
cb776592	187	int fileid_len = sizeof(struct lustre_nfs_fid) / 4;
d7e09d03	188	struct lustre_nfs_fid nfs_fid = (void )fh;
d7e09d03	189
97a075cd JN	190	CDEBUG(D_INFO, "%s: encoding for ("DFID") maxlen=%d minlen=%d\n",
	191	ll_get_fsname(inode->i_sb, NULL, 0),
	192	PFID(ll_inode2fid(inode)), *plen, fileid_len);
d7e09d03	193
cb776592 DE	194	if (*plen < fileid_len) {
	195	*plen = fileid_len;
	196	return FILEID_INVALID;
	197	}
d7e09d03 PT	198
d7e09d03 PT	199	nfs_fid->lnf_child = *ll_inode2fid(inode);
cb776592 DE	200	if (parent)
	201	nfs_fid->lnf_parent = *ll_inode2fid(parent);
	202	else
	203	fid_zero(&nfs_fid->lnf_parent);
	204	*plen = fileid_len;
d7e09d03	205
cb776592	206	return FILEID_LUSTRE;
d7e09d03 PT	207	}
d7e09d03 PT	208
ac7576f4 MS	209	static int ll_nfs_get_name_filldir(struct dir_context ctx, const char name,
	210	int namelen, loff_t hash, u64 ino,
	211	unsigned type)
d7e09d03 PT	212	{
d7e09d03 PT	213	/* It is hack to access lde_fid for comparison with lgd_fid.
c0894c6c OD	214	* So the input 'name' must be part of the 'lu_dirent'.
c0894c6c OD	215	*/
d7e09d03	216	struct lu_dirent *lde = container_of0(name, struct lu_dirent, lde_name);
ac7576f4 MS	217	struct ll_getname_data *lgd =
ac7576f4 MS	218	container_of(ctx, struct ll_getname_data, ctx);
d7e09d03 PT	219	struct lu_fid fid;
	220
	221	fid_le_to_cpu(&fid, &lde->lde_fid);
	222	if (lu_fid_eq(&fid, &lgd->lgd_fid)) {
	223	memcpy(lgd->lgd_name, name, namelen);
	224	lgd->lgd_name[namelen] = 0;
	225	lgd->lgd_found = 1;
	226	}
	227	return lgd->lgd_found;
	228	}
	229
	230	static int ll_get_name(struct dentry dentry, char name,
	231	struct dentry *child)
	232	{
2b0143b5	233	struct inode *dir = d_inode(dentry);
d7e09d03	234	int rc;
0b09d381 PT	235	struct ll_getname_data lgd = {
0b09d381 PT	236	.lgd_name = name,
2b0143b5	237	.lgd_fid = ll_i2info(d_inode(child))->lli_fid,
0b09d381 PT	238	.ctx.actor = ll_nfs_get_name_filldir,
0b09d381 PT	239	};
d7e09d03	240
34e1f2bb JL	241	if (!dir \|\| !S_ISDIR(dir->i_mode)) {
	242	rc = -ENOTDIR;
	243	goto out;
	244	}
d7e09d03	245
34e1f2bb JL	246	if (!dir->i_fop) {
	247	rc = -EINVAL;
	248	goto out;
	249	}
d7e09d03	250
5955102c	251	inode_lock(dir);
0b09d381	252	rc = ll_dir_read(dir, &lgd.ctx);
5955102c	253	inode_unlock(dir);
d7e09d03 PT	254	if (!rc && !lgd.lgd_found)
d7e09d03 PT	255	rc = -ENOENT;
d7e09d03 PT	256	out:
	257	return rc;
	258	}
	259
	260	static struct dentry ll_fh_to_dentry(struct super_block sb, struct fid *fid,
	261	int fh_len, int fh_type)
	262	{
	263	struct lustre_nfs_fid nfs_fid = (struct lustre_nfs_fid )fid;
	264
cb776592	265	if (fh_type != FILEID_LUSTRE)
0a3bdb00	266	return ERR_PTR(-EPROTO);
d7e09d03	267
0a3bdb00	268	return ll_iget_for_nfs(sb, &nfs_fid->lnf_child, &nfs_fid->lnf_parent);
d7e09d03 PT	269	}
	270
	271	static struct dentry ll_fh_to_parent(struct super_block sb, struct fid *fid,
	272	int fh_len, int fh_type)
	273	{
	274	struct lustre_nfs_fid nfs_fid = (struct lustre_nfs_fid )fid;
	275
cb776592	276	if (fh_type != FILEID_LUSTRE)
0a3bdb00	277	return ERR_PTR(-EPROTO);
d7e09d03	278
0a3bdb00	279	return ll_iget_for_nfs(sb, &nfs_fid->lnf_parent, NULL);
d7e09d03 PT	280	}
	281
	282	static struct dentry ll_get_parent(struct dentry dchild)
	283	{
	284	struct ptlrpc_request *req = NULL;
2b0143b5	285	struct inode *dir = d_inode(dchild);
d7e09d03 PT	286	struct ll_sb_info *sbi;
	287	struct dentry *result = NULL;
	288	struct mdt_body *body;
	289	static char dotdot[] = "..";
	290	struct md_op_data *op_data;
	291	int rc;
	292	int lmmsize;
d7e09d03 PT	293
	294	LASSERT(dir && S_ISDIR(dir->i_mode));
	295
	296	sbi = ll_s2sbi(dir->i_sb);
	297
97a075cd JN	298	CDEBUG(D_INFO, "%s: getting parent for ("DFID")\n",
	299	ll_get_fsname(dir->i_sb, NULL, 0),
	300	PFID(ll_inode2fid(dir)));
d7e09d03	301
44779340	302	rc = ll_get_default_mdsize(sbi, &lmmsize);
d7e09d03	303	if (rc != 0)
0a3bdb00	304	return ERR_PTR(rc);
d7e09d03 PT	305
	306	op_data = ll_prep_md_op_data(NULL, dir, NULL, dotdot,
	307	strlen(dotdot), lmmsize,
	308	LUSTRE_OPC_ANY, NULL);
	309	if (IS_ERR(op_data))
0a3bdb00	310	return (void *)op_data;
d7e09d03 PT	311
	312	rc = md_getattr_name(sbi->ll_md_exp, op_data, &req);
	313	ll_finish_md_op_data(op_data);
	314	if (rc) {
97a075cd JN	315	CERROR("%s: failure inode "DFID" get parent: rc = %d\n",
	316	ll_get_fsname(dir->i_sb, NULL, 0),
	317	PFID(ll_inode2fid(dir)), rc);
0a3bdb00	318	return ERR_PTR(rc);
d7e09d03 PT	319	}
d7e09d03 PT	320	body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY);
1e5a6fa9 BJ	321	/*
	322	* LU-3952: MDT may lost the FID of its parent, we should not crash
	323	* the NFS server, ll_iget_for_nfs() will handle the error.
	324	*/
	325	if (body->valid & OBD_MD_FLID) {
	326	CDEBUG(D_INFO, "parent for " DFID " is " DFID "\n",
	327	PFID(ll_inode2fid(dir)), PFID(&body->fid1));
	328	}
d7e09d03 PT	329	result = ll_iget_for_nfs(dir->i_sb, &body->fid1, NULL);
	330
	331	ptlrpc_req_finished(req);
0a3bdb00	332	return result;
d7e09d03 PT	333	}
d7e09d03 PT	334
98aa7661	335	const struct export_operations lustre_export_operations = {
22ea97f0 OD	336	.get_parent = ll_get_parent,
	337	.encode_fh = ll_encode_fh,
	338	.get_name = ll_get_name,
d7e09d03 PT	339	.fh_to_dentry = ll_fh_to_dentry,
	340	.fh_to_parent = ll_fh_to_parent,
	341	};