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.
36 * This file is part of Lustre, http://www.lustre.org/
37 * Lustre is a trademark of Sun Microsystems, Inc.
39 * lustre/lustre/llite/llite_nfs.c
41 * NFS export of Lustre Light File System
43 * Author: Yury Umanets <umka@clusterfs.com>
44 * Author: Huang Hua <huanghua@clusterfs.com>
47 #define DEBUG_SUBSYSTEM S_LLITE
48 #include <lustre_lite.h>
49 #include "llite_internal.h"
50 #ifdef HAVE_LINUX_EXPORTFS_H
51 #include <linux/exportfs.h>
54 __u32 get_uuid2int(const char *name, int len)
56 __u32 key0 = 0x12a3fe2d, key1 = 0x37abe8f9;
58 __u32 key = key1 + (key0 ^ (*name++ * 7152373));
59 if (key & 0x80000000) key -= 0x7fffffff;
66 static int ll_nfs_test_inode(struct inode *inode, void *opaque)
68 return lu_fid_eq(&ll_i2info(inode)->lli_fid,
69 (struct lu_fid *)opaque);
72 static struct inode *search_inode_for_lustre(struct super_block *sb,
73 const struct lu_fid *fid)
75 struct ll_sb_info *sbi = ll_s2sbi(sb);
76 struct ptlrpc_request *req = NULL;
77 struct inode *inode = NULL;
79 unsigned long hash = (unsigned long) cl_fid_build_ino(fid, 0);
80 struct md_op_data *op_data;
84 CDEBUG(D_INFO, "searching inode for:(%lu,"DFID")\n", hash, PFID(fid));
86 inode = ilookup5(sb, hash, ll_nfs_test_inode, (void *)fid);
90 rc = ll_get_max_mdsize(sbi, &eadatalen);
94 /* Because inode is NULL, ll_prep_md_op_data can not
95 * be used here. So we allocate op_data ourselves */
96 OBD_ALLOC_PTR(op_data);
98 return ERR_PTR(-ENOMEM);
100 op_data->op_fid1 = *fid;
101 op_data->op_mode = eadatalen;
102 op_data->op_valid = OBD_MD_FLEASIZE;
104 /* mds_fid2dentry ignores f_type */
105 rc = md_getattr(sbi->ll_md_exp, op_data, &req);
106 OBD_FREE_PTR(op_data);
108 CERROR("can't get object attrs, fid "DFID", rc %d\n",
112 rc = ll_prep_inode(&inode, req, sb);
113 ptlrpc_req_finished(req);
120 struct lustre_nfs_fid {
121 struct lu_fid lnf_child;
122 struct lu_fid lnf_parent;
125 static struct dentry *
126 ll_iget_for_nfs(struct super_block *sb, struct lu_fid *fid, struct lu_fid *parent)
129 struct dentry *result;
132 CDEBUG(D_INFO, "Get dentry for fid: "DFID"\n", PFID(fid));
133 if (!fid_is_sane(fid))
134 RETURN(ERR_PTR(-ESTALE));
136 inode = search_inode_for_lustre(sb, fid);
138 RETURN(ERR_PTR(PTR_ERR(inode)));
140 if (is_bad_inode(inode)) {
141 /* we didn't find the right inode.. */
143 RETURN(ERR_PTR(-ESTALE));
147 * It is an anonymous dentry without OST objects created yet.
148 * We have to find the parent to tell MDS how to init lov objects.
150 if (S_ISREG(inode->i_mode) && ll_i2info(inode)->lli_smd == NULL &&
152 struct ll_inode_info *lli = ll_i2info(inode);
154 cfs_spin_lock(&lli->lli_lock);
155 lli->lli_pfid = *parent;
156 cfs_spin_unlock(&lli->lli_lock);
159 result = d_obtain_alias(inode);
163 ll_dops_init(result, 1, 0);
168 #define LUSTRE_NFS_FID 0x97
171 * \a connectable - is nfsd will connect himself or this should be done
174 * The return value is file handle type:
175 * 1 -- contains child file handle;
176 * 2 -- contains child file handle and parent file handle;
179 static int ll_encode_fh(struct dentry *de, __u32 *fh, int *plen,
182 struct inode *inode = de->d_inode;
183 struct inode *parent = de->d_parent->d_inode;
184 struct lustre_nfs_fid *nfs_fid = (void *)fh;
187 CDEBUG(D_INFO, "encoding for (%lu,"DFID") maxlen=%d minlen=%d\n",
188 inode->i_ino, PFID(ll_inode2fid(inode)), *plen,
189 (int)sizeof(struct lustre_nfs_fid));
191 if (*plen < sizeof(struct lustre_nfs_fid)/4)
194 nfs_fid->lnf_child = *ll_inode2fid(inode);
195 nfs_fid->lnf_parent = *ll_inode2fid(parent);
196 *plen = sizeof(struct lustre_nfs_fid)/4;
198 RETURN(LUSTRE_NFS_FID);
201 static int ll_nfs_get_name_filldir(void *cookie, const char *name, int namelen,
202 loff_t hash, u64 ino, unsigned type)
204 /* It is hack to access lde_fid for comparison with lgd_fid.
205 * So the input 'name' must be part of the 'lu_dirent'. */
206 struct lu_dirent *lde = container_of0(name, struct lu_dirent, lde_name);
207 struct ll_getname_data *lgd = cookie;
210 fid_le_to_cpu(&fid, &lde->lde_fid);
211 if (lu_fid_eq(&fid, &lgd->lgd_fid)) {
212 memcpy(lgd->lgd_name, name, namelen);
213 lgd->lgd_name[namelen] = 0;
216 return lgd->lgd_found;
219 static int ll_get_name(struct dentry *dentry, char *name,
220 struct dentry *child)
222 struct inode *dir = dentry->d_inode;
224 struct ll_getname_data lgd;
228 if (!dir || !S_ISDIR(dir->i_mode))
229 GOTO(out, rc = -ENOTDIR);
232 GOTO(out, rc = -EINVAL);
234 filp = ll_dentry_open(dget(dentry), mntget(ll_i2sbi(dir)->ll_mnt),
235 O_RDONLY, current_cred());
237 GOTO(out, rc = PTR_ERR(filp));
239 if (!filp->f_op->readdir)
240 GOTO(out_close, rc = -EINVAL);
243 lgd.lgd_fid = ll_i2info(child->d_inode)->lli_fid;
246 cfs_mutex_lock(&dir->i_mutex);
247 rc = ll_readdir(filp, &lgd, ll_nfs_get_name_filldir);
248 cfs_mutex_unlock(&dir->i_mutex);
249 if (!rc && !lgd.lgd_found)
259 #ifdef HAVE_FH_TO_DENTRY
260 static struct dentry *ll_fh_to_dentry(struct super_block *sb, struct fid *fid,
261 int fh_len, int fh_type)
263 struct lustre_nfs_fid *nfs_fid = (struct lustre_nfs_fid *)fid;
265 if (fh_type != LUSTRE_NFS_FID)
266 RETURN(ERR_PTR(-EPROTO));
268 RETURN(ll_iget_for_nfs(sb, &nfs_fid->lnf_child, &nfs_fid->lnf_parent));
271 static struct dentry *ll_fh_to_parent(struct super_block *sb, struct fid *fid,
272 int fh_len, int fh_type)
274 struct lustre_nfs_fid *nfs_fid = (struct lustre_nfs_fid *)fid;
276 if (fh_type != LUSTRE_NFS_FID)
277 RETURN(ERR_PTR(-EPROTO));
279 RETURN(ll_iget_for_nfs(sb, &nfs_fid->lnf_parent, NULL));
285 * This length is counted as amount of __u32,
286 * It is composed of a fid and a mode
288 static struct dentry *ll_decode_fh(struct super_block *sb, __u32 *fh, int fh_len,
290 int (*acceptable)(void *, struct dentry *),
293 struct lustre_nfs_fid *nfs_fid = (void *)fh;
294 struct dentry *entry;
297 CDEBUG(D_INFO, "decoding for "DFID" fh_len=%d fh_type=%x\n",
298 PFID(&nfs_fid->lnf_child), fh_len, fh_type);
300 if (fh_type != LUSTRE_NFS_FID)
301 RETURN(ERR_PTR(-EPROTO));
303 entry = sb->s_export_op->find_exported_dentry(sb, &nfs_fid->lnf_child,
304 &nfs_fid->lnf_parent,
305 acceptable, context);
309 static struct dentry *ll_get_dentry(struct super_block *sb, void *data)
311 struct dentry *entry;
314 entry = ll_iget_for_nfs(sb, data, NULL);
318 static struct dentry *ll_get_parent(struct dentry *dchild)
320 struct ptlrpc_request *req = NULL;
321 struct inode *dir = dchild->d_inode;
322 struct ll_sb_info *sbi;
323 struct dentry *result = NULL;
324 struct mdt_body *body;
325 static char dotdot[] = "..";
326 struct md_op_data *op_data;
330 LASSERT(dir && S_ISDIR(dir->i_mode));
332 sbi = ll_s2sbi(dir->i_sb);
334 CDEBUG(D_INFO, "getting parent for (%lu,"DFID")\n",
335 dir->i_ino, PFID(ll_inode2fid(dir)));
337 op_data = ll_prep_md_op_data(NULL, dir, NULL, dotdot,
339 LUSTRE_OPC_ANY, NULL);
341 RETURN(ERR_PTR(-ENOMEM));
343 rc = md_getattr_name(sbi->ll_md_exp, op_data, &req);
344 ll_finish_md_op_data(op_data);
346 CERROR("failure %d inode %lu get parent\n", rc, dir->i_ino);
349 body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY);
350 LASSERT(body->valid & OBD_MD_FLID);
352 CDEBUG(D_INFO, "parent for "DFID" is "DFID"\n",
353 PFID(ll_inode2fid(dir)), PFID(&body->fid1));
355 result = ll_iget_for_nfs(dir->i_sb, &body->fid1, NULL);
357 ptlrpc_req_finished(req);
361 struct export_operations lustre_export_operations = {
362 .get_parent = ll_get_parent,
363 .encode_fh = ll_encode_fh,
364 .get_name = ll_get_name,
365 #ifdef HAVE_FH_TO_DENTRY
366 .fh_to_dentry = ll_fh_to_dentry,
367 .fh_to_parent = ll_fh_to_parent,
369 .get_dentry = ll_get_dentry,
370 .decode_fh = ll_decode_fh,