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, 2013, Intel Corporation.
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 #include <linux/exportfs.h>
49 __u32 get_uuid2int(const char *name, int len)
51 __u32 key0 = 0x12a3fe2d, key1 = 0x37abe8f9;
53 __u32 key = key1 + (key0 ^ (*name++ * 7152373));
54 if (key & 0x80000000) key -= 0x7fffffff;
61 static int ll_nfs_test_inode(struct inode *inode, void *opaque)
63 return lu_fid_eq(&ll_i2info(inode)->lli_fid,
64 (struct lu_fid *)opaque);
67 struct inode *search_inode_for_lustre(struct super_block *sb,
68 const struct lu_fid *fid)
70 struct ll_sb_info *sbi = ll_s2sbi(sb);
71 struct ptlrpc_request *req = NULL;
72 struct inode *inode = NULL;
74 unsigned long hash = cl_fid_build_ino(fid,
75 ll_need_32bit_api(sbi));
76 struct md_op_data *op_data;
80 CDEBUG(D_INFO, "searching inode for:(%lu,"DFID")\n", hash, PFID(fid));
82 inode = ilookup5(sb, hash, ll_nfs_test_inode, (void *)fid);
86 rc = ll_get_max_mdsize(sbi, &eadatalen);
90 /* Because inode is NULL, ll_prep_md_op_data can not
91 * be used here. So we allocate op_data ourselves */
92 OBD_ALLOC_PTR(op_data);
94 return ERR_PTR(-ENOMEM);
96 op_data->op_fid1 = *fid;
97 op_data->op_mode = eadatalen;
98 op_data->op_valid = OBD_MD_FLEASIZE;
100 /* mds_fid2dentry ignores f_type */
101 rc = md_getattr(sbi->ll_md_exp, op_data, &req);
102 OBD_FREE_PTR(op_data);
104 CERROR("can't get object attrs, fid "DFID", rc %d\n",
108 rc = ll_prep_inode(&inode, req, sb, NULL);
109 ptlrpc_req_finished(req);
116 struct lustre_nfs_fid {
117 struct lu_fid lnf_child;
118 struct lu_fid lnf_parent;
121 static struct dentry *
122 ll_iget_for_nfs(struct super_block *sb, struct lu_fid *fid, struct lu_fid *parent)
125 struct dentry *result;
128 CDEBUG(D_INFO, "Get dentry for fid: "DFID"\n", PFID(fid));
129 if (!fid_is_sane(fid))
130 RETURN(ERR_PTR(-ESTALE));
132 inode = search_inode_for_lustre(sb, fid);
134 RETURN(ERR_PTR(PTR_ERR(inode)));
136 if (is_bad_inode(inode)) {
137 /* we didn't find the right inode.. */
139 RETURN(ERR_PTR(-ESTALE));
143 * It is an anonymous dentry without OST objects created yet.
144 * We have to find the parent to tell MDS how to init lov objects.
146 if (S_ISREG(inode->i_mode) && !ll_i2info(inode)->lli_has_smd &&
148 struct ll_inode_info *lli = ll_i2info(inode);
150 spin_lock(&lli->lli_lock);
151 lli->lli_pfid = *parent;
152 spin_unlock(&lli->lli_lock);
155 result = d_obtain_alias(inode);
156 if (IS_ERR(result)) {
164 #define LUSTRE_NFS_FID 0x97
167 * \a connectable - is nfsd will connect himself or this should be done
170 * The return value is file handle type:
171 * 1 -- contains child file handle;
172 * 2 -- contains child file handle and parent file handle;
175 #ifndef HAVE_ENCODE_FH_PARENT
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;
182 static int ll_encode_fh(struct inode *inode, __u32 *fh, int *plen,
183 struct inode *parent)
186 struct lustre_nfs_fid *nfs_fid = (void *)fh;
189 CDEBUG(D_INFO, "encoding for (%lu,"DFID") maxlen=%d minlen=%d\n",
190 inode->i_ino, PFID(ll_inode2fid(inode)), *plen,
191 (int)sizeof(struct lustre_nfs_fid));
193 if (*plen < sizeof(struct lustre_nfs_fid) / 4)
196 nfs_fid->lnf_child = *ll_inode2fid(inode);
197 nfs_fid->lnf_parent = *ll_inode2fid(parent);
198 *plen = sizeof(struct lustre_nfs_fid) / 4;
200 RETURN(LUSTRE_NFS_FID);
203 static int ll_nfs_get_name_filldir(void *cookie, const char *name, int namelen,
204 loff_t hash, u64 ino, unsigned type)
206 /* It is hack to access lde_fid for comparison with lgd_fid.
207 * So the input 'name' must be part of the 'lu_dirent'. */
208 struct lu_dirent *lde = container_of0(name, struct lu_dirent, lde_name);
209 struct ll_getname_data *lgd = cookie;
212 fid_le_to_cpu(&fid, &lde->lde_fid);
213 if (lu_fid_eq(&fid, &lgd->lgd_fid)) {
214 memcpy(lgd->lgd_name, name, namelen);
215 lgd->lgd_name[namelen] = 0;
218 return lgd->lgd_found;
221 static int ll_get_name(struct dentry *dentry, char *name,
222 struct dentry *child)
224 struct inode *dir = dentry->d_inode;
225 struct ll_getname_data lgd;
230 if (!dir || !S_ISDIR(dir->i_mode))
231 GOTO(out, rc = -ENOTDIR);
234 GOTO(out, rc = -EINVAL);
237 lgd.lgd_fid = ll_i2info(child->d_inode)->lli_fid;
240 mutex_lock(&dir->i_mutex);
241 rc = ll_dir_read(dir, &offset, &lgd, ll_nfs_get_name_filldir);
242 mutex_unlock(&dir->i_mutex);
243 if (!rc && !lgd.lgd_found)
251 static struct dentry *ll_fh_to_dentry(struct super_block *sb, struct fid *fid,
252 int fh_len, int fh_type)
254 struct lustre_nfs_fid *nfs_fid = (struct lustre_nfs_fid *)fid;
256 if (fh_type != LUSTRE_NFS_FID)
257 RETURN(ERR_PTR(-EPROTO));
259 RETURN(ll_iget_for_nfs(sb, &nfs_fid->lnf_child, &nfs_fid->lnf_parent));
262 static struct dentry *ll_fh_to_parent(struct super_block *sb, struct fid *fid,
263 int fh_len, int fh_type)
265 struct lustre_nfs_fid *nfs_fid = (struct lustre_nfs_fid *)fid;
267 if (fh_type != LUSTRE_NFS_FID)
268 RETURN(ERR_PTR(-EPROTO));
270 RETURN(ll_iget_for_nfs(sb, &nfs_fid->lnf_parent, NULL));
272 static struct dentry *ll_get_parent(struct dentry *dchild)
274 struct ptlrpc_request *req = NULL;
275 struct inode *dir = dchild->d_inode;
276 struct ll_sb_info *sbi;
277 struct dentry *result = NULL;
278 struct mdt_body *body;
279 static char dotdot[] = "..";
280 struct md_op_data *op_data;
285 LASSERT(dir && S_ISDIR(dir->i_mode));
287 sbi = ll_s2sbi(dir->i_sb);
289 CDEBUG(D_INFO, "getting parent for (%lu,"DFID")\n",
290 dir->i_ino, PFID(ll_inode2fid(dir)));
292 rc = ll_get_max_mdsize(sbi, &lmmsize);
296 op_data = ll_prep_md_op_data(NULL, dir, NULL, dotdot,
297 strlen(dotdot), lmmsize,
298 LUSTRE_OPC_ANY, NULL);
300 RETURN((void *)op_data);
302 rc = md_getattr_name(sbi->ll_md_exp, op_data, &req);
303 ll_finish_md_op_data(op_data);
305 CERROR("failure %d inode %lu get parent\n", rc, dir->i_ino);
308 body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY);
309 LASSERT(body->valid & OBD_MD_FLID);
311 CDEBUG(D_INFO, "parent for "DFID" is "DFID"\n",
312 PFID(ll_inode2fid(dir)), PFID(&body->fid1));
314 result = ll_iget_for_nfs(dir->i_sb, &body->fid1, NULL);
316 ptlrpc_req_finished(req);
320 struct export_operations lustre_export_operations = {
321 .get_parent = ll_get_parent,
322 .encode_fh = ll_encode_fh,
323 .get_name = ll_get_name,
324 .fh_to_dentry = ll_fh_to_dentry,
325 .fh_to_parent = ll_fh_to_parent,