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.
32 * Copyright (c) 2011, Whamcloud, Inc.
35 * This file is part of Lustre, http://www.lustre.org/
36 * Lustre is a trademark of Sun Microsystems, Inc.
38 * lustre/lustre/llite/llite_nfs.c
40 * NFS export of Lustre Light File System
42 * Author: Yury Umanets <umka@clusterfs.com>
43 * Author: Huang Hua <huanghua@clusterfs.com>
46 #define DEBUG_SUBSYSTEM S_LLITE
47 #include <lustre_lite.h>
48 #include "llite_internal.h"
49 #ifdef HAVE_LINUX_EXPORTFS_H
50 #include <linux/exportfs.h>
53 __u32 get_uuid2int(const char *name, int len)
55 __u32 key0 = 0x12a3fe2d, key1 = 0x37abe8f9;
57 __u32 key = key1 + (key0 ^ (*name++ * 7152373));
58 if (key & 0x80000000) key -= 0x7fffffff;
65 static int ll_nfs_test_inode(struct inode *inode, void *opaque)
67 return lu_fid_eq(&ll_i2info(inode)->lli_fid,
68 (struct lu_fid *)opaque);
71 static struct inode *search_inode_for_lustre(struct super_block *sb,
72 const struct lu_fid *fid)
74 struct ll_sb_info *sbi = ll_s2sbi(sb);
75 struct ptlrpc_request *req = NULL;
76 struct inode *inode = NULL;
78 unsigned long hash = (unsigned long) cl_fid_build_ino(fid, 0);
79 struct md_op_data *op_data;
83 CDEBUG(D_INFO, "searching inode for:(%lu,"DFID")\n", hash, PFID(fid));
85 inode = ilookup5(sb, hash, ll_nfs_test_inode, (void *)fid);
89 rc = ll_get_max_mdsize(sbi, &eadatalen);
93 /* Because inode is NULL, ll_prep_md_op_data can not
94 * be used here. So we allocate op_data ourselves */
95 OBD_ALLOC_PTR(op_data);
97 return ERR_PTR(-ENOMEM);
99 op_data->op_fid1 = *fid;
100 op_data->op_mode = eadatalen;
101 op_data->op_valid = OBD_MD_FLEASIZE;
103 /* mds_fid2dentry ignores f_type */
104 rc = md_getattr(sbi->ll_md_exp, op_data, &req);
105 OBD_FREE_PTR(op_data);
107 CERROR("can't get object attrs, fid "DFID", rc %d\n",
111 rc = ll_prep_inode(&inode, req, sb);
112 ptlrpc_req_finished(req);
119 struct lustre_nfs_fid {
120 struct lu_fid lnf_child;
121 struct lu_fid lnf_parent;
124 static struct dentry *
125 ll_iget_for_nfs(struct super_block *sb, struct lu_fid *fid, struct lu_fid *parent)
128 struct dentry *result;
131 CDEBUG(D_INFO, "Get dentry for fid: "DFID"\n", PFID(fid));
132 if (!fid_is_sane(fid))
133 RETURN(ERR_PTR(-ESTALE));
135 inode = search_inode_for_lustre(sb, fid);
137 RETURN(ERR_PTR(PTR_ERR(inode)));
139 if (is_bad_inode(inode)) {
140 /* we didn't find the right inode.. */
142 RETURN(ERR_PTR(-ESTALE));
146 * It is an anonymous dentry without OST objects created yet.
147 * We have to find the parent to tell MDS how to init lov objects.
149 if (S_ISREG(inode->i_mode) && ll_i2info(inode)->lli_smd == NULL &&
151 struct ll_inode_info *lli = ll_i2info(inode);
153 cfs_spin_lock(&lli->lli_lock);
154 lli->lli_pfid = *parent;
155 cfs_spin_unlock(&lli->lli_lock);
158 result = d_obtain_alias(inode);
162 ll_dops_init(result, 1, 0);
167 #define LUSTRE_NFS_FID 0x97
170 * \a connectable - is nfsd will connect himself or this should be done
173 * The return value is file handle type:
174 * 1 -- contains child file handle;
175 * 2 -- contains child file handle and parent file handle;
178 static int ll_encode_fh(struct dentry *de, __u32 *fh, int *plen,
181 struct inode *inode = de->d_inode;
182 struct inode *parent = de->d_parent->d_inode;
183 struct lustre_nfs_fid *nfs_fid = (void *)fh;
186 CDEBUG(D_INFO, "encoding for (%lu,"DFID") maxlen=%d minlen=%d\n",
187 inode->i_ino, PFID(ll_inode2fid(inode)), *plen,
188 (int)sizeof(struct lustre_nfs_fid));
190 if (*plen < sizeof(struct lustre_nfs_fid)/4)
193 nfs_fid->lnf_child = *ll_inode2fid(inode);
194 nfs_fid->lnf_parent = *ll_inode2fid(parent);
195 *plen = sizeof(struct lustre_nfs_fid)/4;
197 RETURN(LUSTRE_NFS_FID);
200 static int ll_nfs_get_name_filldir(void *cookie, const char *name, int namelen,
201 loff_t hash, u64 ino, unsigned type)
203 /* It is hack to access lde_fid for comparison with lgd_fid.
204 * So the input 'name' must be part of the 'lu_dirent'. */
205 struct lu_dirent *lde = container_of0(name, struct lu_dirent, lde_name);
206 struct ll_getname_data *lgd = cookie;
209 fid_le_to_cpu(&fid, &lde->lde_fid);
210 if (lu_fid_eq(&fid, &lgd->lgd_fid)) {
211 memcpy(lgd->lgd_name, name, namelen);
212 lgd->lgd_name[namelen] = 0;
215 return lgd->lgd_found;
218 static int ll_get_name(struct dentry *dentry, char *name,
219 struct dentry *child)
221 struct inode *dir = dentry->d_inode;
223 struct ll_getname_data lgd;
227 if (!dir || !S_ISDIR(dir->i_mode))
228 GOTO(out, rc = -ENOTDIR);
231 GOTO(out, rc = -EINVAL);
233 filp = ll_dentry_open(dget(dentry), mntget(ll_i2sbi(dir)->ll_mnt),
234 O_RDONLY, current_cred());
236 GOTO(out, rc = PTR_ERR(filp));
238 if (!filp->f_op->readdir)
239 GOTO(out_close, rc = -EINVAL);
242 lgd.lgd_fid = ll_i2info(child->d_inode)->lli_fid;
245 cfs_mutex_lock(&dir->i_mutex);
246 rc = ll_readdir(filp, &lgd, ll_nfs_get_name_filldir);
247 cfs_mutex_unlock(&dir->i_mutex);
248 if (!rc && !lgd.lgd_found)
258 #ifdef HAVE_FH_TO_DENTRY
259 static struct dentry *ll_fh_to_dentry(struct super_block *sb, struct fid *fid,
260 int fh_len, int fh_type)
262 struct lustre_nfs_fid *nfs_fid = (struct lustre_nfs_fid *)fid;
264 if (fh_type != LUSTRE_NFS_FID)
265 RETURN(ERR_PTR(-EPROTO));
267 RETURN(ll_iget_for_nfs(sb, &nfs_fid->lnf_child, &nfs_fid->lnf_parent));
270 static struct dentry *ll_fh_to_parent(struct super_block *sb, struct fid *fid,
271 int fh_len, int fh_type)
273 struct lustre_nfs_fid *nfs_fid = (struct lustre_nfs_fid *)fid;
275 if (fh_type != LUSTRE_NFS_FID)
276 RETURN(ERR_PTR(-EPROTO));
278 RETURN(ll_iget_for_nfs(sb, &nfs_fid->lnf_parent, NULL));
284 * This length is counted as amount of __u32,
285 * It is composed of a fid and a mode
287 static struct dentry *ll_decode_fh(struct super_block *sb, __u32 *fh, int fh_len,
289 int (*acceptable)(void *, struct dentry *),
292 struct lustre_nfs_fid *nfs_fid = (void *)fh;
293 struct dentry *entry;
296 CDEBUG(D_INFO, "decoding for "DFID" fh_len=%d fh_type=%x\n",
297 PFID(&nfs_fid->lnf_child), fh_len, fh_type);
299 if (fh_type != LUSTRE_NFS_FID)
300 RETURN(ERR_PTR(-EPROTO));
302 entry = sb->s_export_op->find_exported_dentry(sb, &nfs_fid->lnf_child,
303 &nfs_fid->lnf_parent,
304 acceptable, context);
308 static struct dentry *ll_get_dentry(struct super_block *sb, void *data)
310 struct dentry *entry;
313 entry = ll_iget_for_nfs(sb, data, NULL);
317 static struct dentry *ll_get_parent(struct dentry *dchild)
319 struct ptlrpc_request *req = NULL;
320 struct inode *dir = dchild->d_inode;
321 struct ll_sb_info *sbi;
322 struct dentry *result = NULL;
323 struct mdt_body *body;
324 static char dotdot[] = "..";
325 struct md_op_data *op_data;
329 LASSERT(dir && S_ISDIR(dir->i_mode));
331 sbi = ll_s2sbi(dir->i_sb);
333 CDEBUG(D_INFO, "getting parent for (%lu,"DFID")\n",
334 dir->i_ino, PFID(ll_inode2fid(dir)));
336 op_data = ll_prep_md_op_data(NULL, dir, NULL, dotdot,
338 LUSTRE_OPC_ANY, NULL);
340 RETURN((void *)op_data);
342 rc = md_getattr_name(sbi->ll_md_exp, op_data, &req);
343 ll_finish_md_op_data(op_data);
345 CERROR("failure %d inode %lu get parent\n", rc, dir->i_ino);
348 body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY);
349 LASSERT(body->valid & OBD_MD_FLID);
351 CDEBUG(D_INFO, "parent for "DFID" is "DFID"\n",
352 PFID(ll_inode2fid(dir)), PFID(&body->fid1));
354 result = ll_iget_for_nfs(dir->i_sb, &body->fid1, NULL);
356 ptlrpc_req_finished(req);
360 struct export_operations lustre_export_operations = {
361 .get_parent = ll_get_parent,
362 .encode_fh = ll_encode_fh,
363 .get_name = ll_get_name,
364 #ifdef HAVE_FH_TO_DENTRY
365 .fh_to_dentry = ll_fh_to_dentry,
366 .fh_to_parent = ll_fh_to_parent,
368 .get_dentry = ll_get_dentry,
369 .decode_fh = ll_decode_fh,