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 2008 Sun Microsystems, Inc. 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 struct inode *search_inode_for_lustre(struct super_block *sb,
64 const struct lu_fid *fid)
66 struct ll_sb_info *sbi = ll_s2sbi(sb);
67 struct ptlrpc_request *req = NULL;
68 struct inode *inode = NULL;
70 ino_t ino = cl_fid_build_ino(fid);
71 struct md_op_data *op_data;
75 CDEBUG(D_INFO, "searching inode for:(%lu,"DFID")\n", ino, PFID(fid));
77 rc = ll_get_max_mdsize(sbi, &eadatalen);
81 /* Because inode is NULL, ll_prep_md_op_data can not
82 * be used here. So we allocate op_data ourselves */
83 OBD_ALLOC_PTR(op_data);
85 return ERR_PTR(-ENOMEM);
87 op_data->op_fid1 = *fid;
88 op_data->op_mode = eadatalen;
89 op_data->op_valid = OBD_MD_FLEASIZE;
91 /* mds_fid2dentry ignores f_type */
92 rc = md_getattr(sbi->ll_md_exp, op_data, &req);
93 OBD_FREE_PTR(op_data);
95 CERROR("can't get object attrs, fid "DFID", rc %d\n",
99 rc = ll_prep_inode(&inode, req, sb);
100 ptlrpc_req_finished(req);
107 static struct dentry *ll_iget_for_nfs(struct super_block *sb,
108 const struct lu_fid *fid)
111 struct dentry *result;
114 CDEBUG(D_INFO, "Get dentry for fid: "DFID"\n", PFID(fid));
115 if (!fid_is_sane(fid))
116 RETURN(ERR_PTR(-ESTALE));
118 inode = search_inode_for_lustre(sb, fid);
120 RETURN(ERR_PTR(PTR_ERR(inode)));
122 if (is_bad_inode(inode)) {
123 /* we didn't find the right inode.. */
124 CERROR("can't get inode by fid "DFID"\n",
127 RETURN(ERR_PTR(-ESTALE));
130 result = d_obtain_alias(inode);
133 RETURN(ERR_PTR(-ENOMEM));
136 ll_dops_init(result, 1);
141 #define LUSTRE_NFS_FID 0x97
143 struct lustre_nfs_fid {
144 struct lu_fid lnf_child;
145 struct lu_fid lnf_parent;
149 * \a connectable - is nfsd will connect himself or this should be done
152 * The return value is file handle type:
153 * 1 -- contains child file handle;
154 * 2 -- contains child file handle and parent file handle;
157 static int ll_encode_fh(struct dentry *de, __u32 *fh, int *plen,
160 struct inode *inode = de->d_inode;
161 struct inode *parent = de->d_parent->d_inode;
162 struct lustre_nfs_fid *nfs_fid = (void *)fh;
165 CDEBUG(D_INFO, "encoding for (%lu,"DFID") maxlen=%d minlen=%d\n",
166 inode->i_ino, PFID(ll_inode2fid(inode)), *plen,
167 (int)sizeof(struct lustre_nfs_fid));
169 if (*plen < sizeof(struct lustre_nfs_fid)/4)
172 nfs_fid->lnf_child = *ll_inode2fid(inode);
173 nfs_fid->lnf_parent = *ll_inode2fid(parent);
174 *plen = sizeof(struct lustre_nfs_fid)/4;
176 RETURN(LUSTRE_NFS_FID);
179 #ifdef HAVE_FH_TO_DENTRY
180 static struct dentry *ll_fh_to_dentry(struct super_block *sb, struct fid *fid,
181 int fh_len, int fh_type)
183 struct lustre_nfs_fid *nfs_fid = (struct lustre_nfs_fid *)fid;
185 if (fh_type != LUSTRE_NFS_FID)
186 RETURN(ERR_PTR(-EPROTO));
188 RETURN(ll_iget_for_nfs(sb, &nfs_fid->lnf_child));
191 static struct dentry *ll_fh_to_parent(struct super_block *sb, struct fid *fid,
192 int fh_len, int fh_type)
194 struct lustre_nfs_fid *nfs_fid = (struct lustre_nfs_fid *)fid;
196 if (fh_type != LUSTRE_NFS_FID)
197 RETURN(ERR_PTR(-EPROTO));
199 RETURN(ll_iget_for_nfs(sb, &nfs_fid->lnf_parent));
205 * This length is counted as amount of __u32,
206 * It is composed of a fid and a mode
208 static struct dentry *ll_decode_fh(struct super_block *sb, __u32 *fh, int fh_len,
210 int (*acceptable)(void *, struct dentry *),
213 struct lustre_nfs_fid *nfs_fid = (void *)fh;
214 struct dentry *entry;
217 CDEBUG(D_INFO, "decoding for "DFID" fh_len=%d fh_type=%x\n",
218 PFID(&nfs_fid->lnf_child), fh_len, fh_type);
220 if (fh_type != LUSTRE_NFS_FID)
221 RETURN(ERR_PTR(-EPROTO));
223 entry = sb->s_export_op->find_exported_dentry(sb, &nfs_fid->lnf_child,
224 &nfs_fid->lnf_parent,
225 acceptable, context);
229 static struct dentry *ll_get_dentry(struct super_block *sb, void *data)
231 struct lustre_nfs_fid *fid = data;
232 struct dentry *entry;
235 entry = ll_iget_for_nfs(sb, &fid->lnf_child);
239 static struct dentry *ll_get_parent(struct dentry *dchild)
241 struct ptlrpc_request *req = NULL;
242 struct inode *dir = dchild->d_inode;
243 struct ll_sb_info *sbi;
244 struct dentry *result = NULL;
245 struct mdt_body *body;
246 static char dotdot[] = "..";
247 struct md_op_data *op_data;
251 LASSERT(dir && S_ISDIR(dir->i_mode));
253 sbi = ll_s2sbi(dir->i_sb);
255 CDEBUG(D_INFO, "getting parent for (%lu,"DFID")\n",
256 dir->i_ino, PFID(ll_inode2fid(dir)));
258 op_data = ll_prep_md_op_data(NULL, dir, NULL, dotdot,
260 LUSTRE_OPC_ANY, NULL);
262 RETURN(ERR_PTR(-ENOMEM));
264 rc = md_getattr_name(sbi->ll_md_exp, op_data, &req);
265 ll_finish_md_op_data(op_data);
267 CERROR("failure %d inode %lu get parent\n", rc, dir->i_ino);
270 body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY);
271 LASSERT(body->valid & OBD_MD_FLID);
273 CDEBUG(D_INFO, "parent for "DFID" is "DFID"\n",
274 PFID(ll_inode2fid(dir)), PFID(&body->fid1));
276 result = ll_iget_for_nfs(dir->i_sb, &body->fid1);
278 ptlrpc_req_finished(req);
282 struct export_operations lustre_export_operations = {
283 .get_parent = ll_get_parent,
284 .encode_fh = ll_encode_fh,
285 #ifdef HAVE_FH_TO_DENTRY
286 .fh_to_dentry = ll_fh_to_dentry,
287 .fh_to_parent = ll_fh_to_parent,
289 .get_dentry = ll_get_dentry,
290 .decode_fh = ll_decode_fh,