1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
6 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 only,
10 * as published by the Free Software Foundation.
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License version 2 for more details (a copy is included
16 * in the LICENSE file that accompanied this code).
18 * You should have received a copy of the GNU General Public License
19 * version 2 along with this program; If not, see
20 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
22 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
23 * CA 95054 USA or visit www.sun.com if you need additional information or
29 * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
30 * Use is subject to license terms.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
36 * lustre/lustre/llite/llite_nfs.c
38 * NFS export of Lustre Light File System
40 * Author: Yury Umanets <umka@clusterfs.com>
41 * Author: Huang Hua <huanghua@clusterfs.com>
44 #define DEBUG_SUBSYSTEM S_LLITE
45 #include <lustre_lite.h>
46 #include "llite_internal.h"
47 #ifdef HAVE_LINUX_EXPORTFS_H
48 #include <linux/exportfs.h>
51 __u32 get_uuid2int(const char *name, int len)
53 __u32 key0 = 0x12a3fe2d, key1 = 0x37abe8f9;
55 __u32 key = key1 + (key0 ^ (*name++ * 7152373));
56 if (key & 0x80000000) key -= 0x7fffffff;
63 static int ll_nfs_test_inode(struct inode *inode, void *opaque)
65 return lu_fid_eq(&ll_i2info(inode)->lli_fid,
66 (struct lu_fid *)opaque);
69 static struct inode *search_inode_for_lustre(struct super_block *sb,
70 const struct lu_fid *fid)
72 struct ll_sb_info *sbi = ll_s2sbi(sb);
73 struct ptlrpc_request *req = NULL;
74 struct inode *inode = NULL;
76 unsigned long hash = (unsigned long) cl_fid_build_ino(fid);
77 struct md_op_data *op_data;
81 CDEBUG(D_INFO, "searching inode for:(%lu,"DFID")\n", hash, PFID(fid));
83 inode = ilookup5(sb, hash, ll_nfs_test_inode, (void *)fid);
87 rc = ll_get_max_mdsize(sbi, &eadatalen);
91 /* Because inode is NULL, ll_prep_md_op_data can not
92 * be used here. So we allocate op_data ourselves */
93 OBD_ALLOC_PTR(op_data);
95 return ERR_PTR(-ENOMEM);
97 op_data->op_fid1 = *fid;
98 op_data->op_mode = eadatalen;
99 op_data->op_valid = OBD_MD_FLEASIZE;
101 /* mds_fid2dentry ignores f_type */
102 rc = md_getattr(sbi->ll_md_exp, op_data, &req);
103 OBD_FREE_PTR(op_data);
105 CERROR("can't get object attrs, fid "DFID", rc %d\n",
109 rc = ll_prep_inode(&inode, req, sb);
110 ptlrpc_req_finished(req);
117 static struct dentry *ll_iget_for_nfs(struct super_block *sb,
118 const struct lu_fid *fid)
121 struct dentry *result;
124 CDEBUG(D_INFO, "Get dentry for fid: "DFID"\n", PFID(fid));
125 if (!fid_is_sane(fid))
126 RETURN(ERR_PTR(-ESTALE));
128 inode = search_inode_for_lustre(sb, fid);
130 RETURN(ERR_PTR(PTR_ERR(inode)));
132 if (is_bad_inode(inode)) {
133 /* we didn't find the right inode.. */
134 CERROR("can't get inode by fid "DFID"\n",
137 RETURN(ERR_PTR(-ESTALE));
140 result = d_obtain_alias(inode);
143 RETURN(ERR_PTR(-ENOMEM));
146 ll_dops_init(result, 1);
151 #define LUSTRE_NFS_FID 0x97
153 struct lustre_nfs_fid {
154 struct lu_fid lnf_child;
155 struct lu_fid lnf_parent;
159 * \a connectable - is nfsd will connect himself or this should be done
162 * The return value is file handle type:
163 * 1 -- contains child file handle;
164 * 2 -- contains child file handle and parent file handle;
167 static int ll_encode_fh(struct dentry *de, __u32 *fh, int *plen,
170 struct inode *inode = de->d_inode;
171 struct inode *parent = de->d_parent->d_inode;
172 struct lustre_nfs_fid *nfs_fid = (void *)fh;
175 CDEBUG(D_INFO, "encoding for (%lu,"DFID") maxlen=%d minlen=%d\n",
176 inode->i_ino, PFID(ll_inode2fid(inode)), *plen,
177 (int)sizeof(struct lustre_nfs_fid));
179 if (*plen < sizeof(struct lustre_nfs_fid)/4)
182 nfs_fid->lnf_child = *ll_inode2fid(inode);
183 nfs_fid->lnf_parent = *ll_inode2fid(parent);
184 *plen = sizeof(struct lustre_nfs_fid)/4;
186 RETURN(LUSTRE_NFS_FID);
189 #ifdef HAVE_FH_TO_DENTRY
190 static struct dentry *ll_fh_to_dentry(struct super_block *sb, struct fid *fid,
191 int fh_len, int fh_type)
193 struct lustre_nfs_fid *nfs_fid = (struct lustre_nfs_fid *)fid;
195 if (fh_type != LUSTRE_NFS_FID)
196 RETURN(ERR_PTR(-EPROTO));
198 RETURN(ll_iget_for_nfs(sb, &nfs_fid->lnf_child));
201 static struct dentry *ll_fh_to_parent(struct super_block *sb, struct fid *fid,
202 int fh_len, int fh_type)
204 struct lustre_nfs_fid *nfs_fid = (struct lustre_nfs_fid *)fid;
206 if (fh_type != LUSTRE_NFS_FID)
207 RETURN(ERR_PTR(-EPROTO));
209 RETURN(ll_iget_for_nfs(sb, &nfs_fid->lnf_parent));
215 * This length is counted as amount of __u32,
216 * It is composed of a fid and a mode
218 static struct dentry *ll_decode_fh(struct super_block *sb, __u32 *fh, int fh_len,
220 int (*acceptable)(void *, struct dentry *),
223 struct lustre_nfs_fid *nfs_fid = (void *)fh;
224 struct dentry *entry;
227 CDEBUG(D_INFO, "decoding for "DFID" fh_len=%d fh_type=%x\n",
228 PFID(&nfs_fid->lnf_child), fh_len, fh_type);
230 if (fh_type != LUSTRE_NFS_FID)
231 RETURN(ERR_PTR(-EPROTO));
233 entry = sb->s_export_op->find_exported_dentry(sb, &nfs_fid->lnf_child,
234 &nfs_fid->lnf_parent,
235 acceptable, context);
239 static struct dentry *ll_get_dentry(struct super_block *sb, void *data)
241 struct lustre_nfs_fid *fid = data;
242 struct dentry *entry;
245 entry = ll_iget_for_nfs(sb, &fid->lnf_child);
249 static struct dentry *ll_get_parent(struct dentry *dchild)
251 struct ptlrpc_request *req = NULL;
252 struct inode *dir = dchild->d_inode;
253 struct ll_sb_info *sbi;
254 struct dentry *result = NULL;
255 struct mdt_body *body;
256 static char dotdot[] = "..";
257 struct md_op_data *op_data;
261 LASSERT(dir && S_ISDIR(dir->i_mode));
263 sbi = ll_s2sbi(dir->i_sb);
265 CDEBUG(D_INFO, "getting parent for (%lu,"DFID")\n",
266 dir->i_ino, PFID(ll_inode2fid(dir)));
268 op_data = ll_prep_md_op_data(NULL, dir, NULL, dotdot,
270 LUSTRE_OPC_ANY, NULL);
272 RETURN(ERR_PTR(-ENOMEM));
274 rc = md_getattr_name(sbi->ll_md_exp, op_data, &req);
275 ll_finish_md_op_data(op_data);
277 CERROR("failure %d inode %lu get parent\n", rc, dir->i_ino);
280 body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY);
281 LASSERT(body->valid & OBD_MD_FLID);
283 CDEBUG(D_INFO, "parent for "DFID" is "DFID"\n",
284 PFID(ll_inode2fid(dir)), PFID(&body->fid1));
286 result = ll_iget_for_nfs(dir->i_sb, &body->fid1);
288 ptlrpc_req_finished(req);
292 struct export_operations lustre_export_operations = {
293 .get_parent = ll_get_parent,
294 .encode_fh = ll_encode_fh,
295 #ifdef HAVE_FH_TO_DENTRY
296 .fh_to_dentry = ll_fh_to_dentry,
297 .fh_to_parent = ll_fh_to_parent,
299 .get_dentry = ll_get_dentry,
300 .decode_fh = ll_decode_fh,