4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
8 * as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
16 * You should have received a copy of the GNU General Public License
17 * version 2 along with this program; If not, see
18 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
20 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
21 * CA 95054 USA or visit www.sun.com if you need additional information or
27 * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
28 * Use is subject to license terms.
30 * Copyright (c) 2011, Whamcloud, Inc.
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, 0);
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 struct lustre_nfs_fid {
118 struct lu_fid lnf_child;
119 struct lu_fid lnf_parent;
122 static struct dentry *
123 ll_iget_for_nfs(struct super_block *sb, struct lu_fid *fid, struct lu_fid *parent)
126 struct dentry *result;
129 CDEBUG(D_INFO, "Get dentry for fid: "DFID"\n", PFID(fid));
130 if (!fid_is_sane(fid))
131 RETURN(ERR_PTR(-ESTALE));
133 inode = search_inode_for_lustre(sb, fid);
135 RETURN(ERR_PTR(PTR_ERR(inode)));
137 if (is_bad_inode(inode)) {
138 /* we didn't find the right inode.. */
140 RETURN(ERR_PTR(-ESTALE));
144 * It is an anonymous dentry without OST objects created yet.
145 * We have to find the parent to tell MDS how to init lov objects.
147 if (S_ISREG(inode->i_mode) && !ll_i2info(inode)->lli_has_smd &&
149 struct ll_inode_info *lli = ll_i2info(inode);
151 cfs_spin_lock(&lli->lli_lock);
152 lli->lli_pfid = *parent;
153 cfs_spin_unlock(&lli->lli_lock);
156 result = d_obtain_alias(inode);
160 ll_dops_init(result, 1, 0);
165 #define LUSTRE_NFS_FID 0x97
168 * \a connectable - is nfsd will connect himself or this should be done
171 * The return value is file handle type:
172 * 1 -- contains child file handle;
173 * 2 -- contains child file handle and parent file handle;
176 static int ll_encode_fh(struct dentry *de, __u32 *fh, int *plen,
179 struct inode *inode = de->d_inode;
180 struct inode *parent = de->d_parent->d_inode;
181 struct lustre_nfs_fid *nfs_fid = (void *)fh;
184 CDEBUG(D_INFO, "encoding for (%lu,"DFID") maxlen=%d minlen=%d\n",
185 inode->i_ino, PFID(ll_inode2fid(inode)), *plen,
186 (int)sizeof(struct lustre_nfs_fid));
188 if (*plen < sizeof(struct lustre_nfs_fid)/4)
191 nfs_fid->lnf_child = *ll_inode2fid(inode);
192 nfs_fid->lnf_parent = *ll_inode2fid(parent);
193 *plen = sizeof(struct lustre_nfs_fid)/4;
195 RETURN(LUSTRE_NFS_FID);
198 static int ll_nfs_get_name_filldir(void *cookie, const char *name, int namelen,
199 loff_t hash, u64 ino, unsigned type)
201 /* It is hack to access lde_fid for comparison with lgd_fid.
202 * So the input 'name' must be part of the 'lu_dirent'. */
203 struct lu_dirent *lde = container_of0(name, struct lu_dirent, lde_name);
204 struct ll_getname_data *lgd = cookie;
207 fid_le_to_cpu(&fid, &lde->lde_fid);
208 if (lu_fid_eq(&fid, &lgd->lgd_fid)) {
209 memcpy(lgd->lgd_name, name, namelen);
210 lgd->lgd_name[namelen] = 0;
213 return lgd->lgd_found;
216 static int ll_get_name(struct dentry *dentry, char *name,
217 struct dentry *child)
219 struct inode *dir = dentry->d_inode;
220 struct ll_getname_data lgd;
225 if (!dir || !S_ISDIR(dir->i_mode))
226 GOTO(out, rc = -ENOTDIR);
229 GOTO(out, rc = -EINVAL);
232 lgd.lgd_fid = ll_i2info(child->d_inode)->lli_fid;
235 cfs_mutex_lock(&dir->i_mutex);
236 rc = ll_dir_read(dir, &offset, &lgd, ll_nfs_get_name_filldir);
237 cfs_mutex_unlock(&dir->i_mutex);
238 if (!rc && !lgd.lgd_found)
246 #ifdef HAVE_FH_TO_DENTRY
247 static struct dentry *ll_fh_to_dentry(struct super_block *sb, struct fid *fid,
248 int fh_len, int fh_type)
250 struct lustre_nfs_fid *nfs_fid = (struct lustre_nfs_fid *)fid;
252 if (fh_type != LUSTRE_NFS_FID)
253 RETURN(ERR_PTR(-EPROTO));
255 RETURN(ll_iget_for_nfs(sb, &nfs_fid->lnf_child, &nfs_fid->lnf_parent));
258 static struct dentry *ll_fh_to_parent(struct super_block *sb, struct fid *fid,
259 int fh_len, int fh_type)
261 struct lustre_nfs_fid *nfs_fid = (struct lustre_nfs_fid *)fid;
263 if (fh_type != LUSTRE_NFS_FID)
264 RETURN(ERR_PTR(-EPROTO));
266 RETURN(ll_iget_for_nfs(sb, &nfs_fid->lnf_parent, NULL));
272 * This length is counted as amount of __u32,
273 * It is composed of a fid and a mode
275 static struct dentry *ll_decode_fh(struct super_block *sb, __u32 *fh, int fh_len,
277 int (*acceptable)(void *, struct dentry *),
280 struct lustre_nfs_fid *nfs_fid = (void *)fh;
281 struct dentry *entry;
284 CDEBUG(D_INFO, "decoding for "DFID" fh_len=%d fh_type=%x\n",
285 PFID(&nfs_fid->lnf_child), fh_len, fh_type);
287 if (fh_type != LUSTRE_NFS_FID)
288 RETURN(ERR_PTR(-EPROTO));
290 entry = sb->s_export_op->find_exported_dentry(sb, &nfs_fid->lnf_child,
291 &nfs_fid->lnf_parent,
292 acceptable, context);
296 static struct dentry *ll_get_dentry(struct super_block *sb, void *data)
298 struct dentry *entry;
301 entry = ll_iget_for_nfs(sb, data, NULL);
305 static struct dentry *ll_get_parent(struct dentry *dchild)
307 struct ptlrpc_request *req = NULL;
308 struct inode *dir = dchild->d_inode;
309 struct ll_sb_info *sbi;
310 struct dentry *result = NULL;
311 struct mdt_body *body;
312 static char dotdot[] = "..";
313 struct md_op_data *op_data;
317 LASSERT(dir && S_ISDIR(dir->i_mode));
319 sbi = ll_s2sbi(dir->i_sb);
321 CDEBUG(D_INFO, "getting parent for (%lu,"DFID")\n",
322 dir->i_ino, PFID(ll_inode2fid(dir)));
324 op_data = ll_prep_md_op_data(NULL, dir, NULL, dotdot,
326 LUSTRE_OPC_ANY, NULL);
328 RETURN((void *)op_data);
330 rc = md_getattr_name(sbi->ll_md_exp, op_data, &req);
331 ll_finish_md_op_data(op_data);
333 CERROR("failure %d inode %lu get parent\n", rc, dir->i_ino);
336 body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY);
337 LASSERT(body->valid & OBD_MD_FLID);
339 CDEBUG(D_INFO, "parent for "DFID" is "DFID"\n",
340 PFID(ll_inode2fid(dir)), PFID(&body->fid1));
342 result = ll_iget_for_nfs(dir->i_sb, &body->fid1, NULL);
344 ptlrpc_req_finished(req);
348 struct export_operations lustre_export_operations = {
349 .get_parent = ll_get_parent,
350 .encode_fh = ll_encode_fh,
351 .get_name = ll_get_name,
352 #ifdef HAVE_FH_TO_DENTRY
353 .fh_to_dentry = ll_fh_to_dentry,
354 .fh_to_parent = ll_fh_to_parent,
356 .get_dentry = ll_get_dentry,
357 .decode_fh = ll_decode_fh,