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 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;
75 unsigned long valid = 0;
77 ino_t ino = cl_fid_build_ino(fid);
81 CDEBUG(D_INFO, "searching inode for:(%lu,"DFID")\n", ino, PFID(fid));
83 inode = ILOOKUP(sb, ino, ll_nfs_test_inode, fid);
87 rc = ll_get_max_mdsize(sbi, &eadatalen);
91 valid |= OBD_MD_FLEASIZE;
93 /* mds_fid2dentry ignores f_type */
94 rc = md_getattr(sbi->ll_md_exp, fid, NULL, valid, eadatalen, &req);
96 CERROR("can't get object attrs, fid "DFID", rc %d\n",
101 rc = ll_prep_inode(&inode, req, sb);
102 ptlrpc_req_finished(req);
109 static struct dentry *ll_iget_for_nfs(struct super_block *sb,
110 const struct lu_fid *fid)
113 struct dentry *result;
116 CDEBUG(D_INFO, "Get dentry for fid: "DFID"\n", PFID(fid));
117 if (!fid_is_sane(fid))
118 RETURN(ERR_PTR(-ESTALE));
120 inode = search_inode_for_lustre(sb, fid);
122 RETURN(ERR_PTR(PTR_ERR(inode)));
124 if (is_bad_inode(inode)) {
125 /* we didn't find the right inode.. */
126 CERROR("can't get inode by fid "DFID"\n",
129 RETURN(ERR_PTR(-ESTALE));
132 result = d_alloc_anon(inode);
135 RETURN(ERR_PTR(-ENOMEM));
138 ll_dops_init(result, 1);
143 #define LUSTRE_NFS_FID 0x97
145 struct lustre_nfs_fid {
146 struct lu_fid lnf_child;
147 struct lu_fid lnf_parent;
151 * \a connectable - is nfsd will connect himself or this should be done
154 * The return value is file handle type:
155 * 1 -- contains child file handle;
156 * 2 -- contains child file handle and parent file handle;
159 static int ll_encode_fh(struct dentry *de, __u32 *fh, int *plen,
162 struct inode *inode = de->d_inode;
163 struct inode *parent = de->d_parent->d_inode;
164 struct lustre_nfs_fid *nfs_fid = (void *)fh;
167 CDEBUG(D_INFO, "encoding for (%lu,"DFID") maxlen=%d minlen=%d\n",
168 inode->i_ino, PFID(ll_inode2fid(inode)), *plen,
169 (int)sizeof(struct lustre_nfs_fid));
171 if (*plen < sizeof(struct lustre_nfs_fid)/4)
174 nfs_fid->lnf_child = *ll_inode2fid(inode);
175 nfs_fid->lnf_parent = *ll_inode2fid(parent);
176 *plen = sizeof(struct lustre_nfs_fid)/4;
178 RETURN(LUSTRE_NFS_FID);
181 #ifdef HAVE_FH_TO_DENTRY
182 static struct dentry *ll_fh_to_dentry(struct super_block *sb, struct fid *fid,
183 int fh_len, int fh_type)
185 struct lustre_nfs_fid *nfs_fid = (struct lustre_nfs_fid *)fid;
187 if (fh_type != LUSTRE_NFS_FID)
188 RETURN(ERR_PTR(-EPROTO));
190 RETURN(ll_iget_for_nfs(sb, &nfs_fid->lnf_child));
193 static struct dentry *ll_fh_to_parent(struct super_block *sb, struct fid *fid,
194 int fh_len, int fh_type)
196 struct lustre_nfs_fid *nfs_fid = (struct lustre_nfs_fid *)fid;
198 if (fh_type != LUSTRE_NFS_FID)
199 RETURN(ERR_PTR(-EPROTO));
201 RETURN(ll_iget_for_nfs(sb, &nfs_fid->lnf_parent));
207 * This length is counted as amount of __u32,
208 * It is composed of a fid and a mode
210 static struct dentry *ll_decode_fh(struct super_block *sb, __u32 *fh, int fh_len,
212 int (*acceptable)(void *, struct dentry *),
215 struct lustre_nfs_fid *nfs_fid = (void *)fh;
216 struct dentry *entry;
219 CDEBUG(D_INFO, "decoding for "DFID" fh_len=%d fh_type=%x\n",
220 PFID(&nfs_fid->lnf_child), fh_len, fh_type);
222 if (fh_type != LUSTRE_NFS_FID)
223 RETURN(ERR_PTR(-EPROTO));
225 entry = sb->s_export_op->find_exported_dentry(sb, &nfs_fid->lnf_child,
226 &nfs_fid->lnf_parent,
227 acceptable, context);
231 static struct dentry *ll_get_dentry(struct super_block *sb, void *data)
233 struct lustre_nfs_fid *fid = data;
234 struct dentry *entry;
237 entry = ll_iget_for_nfs(sb, &fid->lnf_child);
242 static struct dentry *ll_get_parent(struct dentry *dchild)
244 struct ptlrpc_request *req = NULL;
245 struct inode *dir = dchild->d_inode;
246 struct ll_sb_info *sbi;
247 struct dentry *result = NULL;
248 struct mdt_body *body;
249 static char dotdot[] = "..";
253 LASSERT(dir && S_ISDIR(dir->i_mode));
255 sbi = ll_s2sbi(dir->i_sb);
257 CDEBUG(D_INFO, "getting parent for (%lu,"DFID")\n",
258 dir->i_ino, PFID(ll_inode2fid(dir)));
260 rc = md_getattr_name(sbi->ll_md_exp, ll_inode2fid(dir), NULL,
261 dotdot, strlen(dotdot) + 1, 0, 0,
262 ll_i2suppgid(dir), &req);
264 CERROR("failure %d inode %lu get parent\n", rc, dir->i_ino);
267 body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY);
268 LASSERT(body->valid & OBD_MD_FLID);
270 CDEBUG(D_INFO, "parent for "DFID" is "DFID"\n",
271 PFID(ll_inode2fid(dir)), PFID(&body->fid1));
273 result = ll_iget_for_nfs(dir->i_sb, &body->fid1);
275 ptlrpc_req_finished(req);
279 struct export_operations lustre_export_operations = {
280 .get_parent = ll_get_parent,
281 .encode_fh = ll_encode_fh,
282 #ifdef HAVE_FH_TO_DENTRY
283 .fh_to_dentry = ll_fh_to_dentry,
284 .fh_to_parent = ll_fh_to_parent,
286 .get_dentry = ll_get_dentry,
287 .decode_fh = ll_decode_fh,