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 struct inode *search_inode_for_lustre(struct super_block *sb,
62 const struct lu_fid *fid)
64 struct ll_sb_info *sbi = ll_s2sbi(sb);
65 struct ptlrpc_request *req = NULL;
66 struct inode *inode = NULL;
68 unsigned long hash = cl_fid_build_ino(fid,
69 ll_need_32bit_api(sbi));
70 struct md_op_data *op_data;
74 CDEBUG(D_INFO, "searching inode for:(%lu,"DFID")\n", hash, PFID(fid));
76 inode = ilookup5(sb, hash, ll_test_inode_by_fid, (void *)fid);
80 rc = ll_get_default_mdsize(sbi, &eadatalen);
84 /* Because inode is NULL, ll_prep_md_op_data can not
85 * be used here. So we allocate op_data ourselves */
86 OBD_ALLOC_PTR(op_data);
88 return ERR_PTR(-ENOMEM);
90 op_data->op_fid1 = *fid;
91 op_data->op_mode = eadatalen;
92 op_data->op_valid = OBD_MD_FLEASIZE;
94 /* mds_fid2dentry ignores f_type */
95 rc = md_getattr(sbi->ll_md_exp, op_data, &req);
96 OBD_FREE_PTR(op_data);
98 /* Suppress erroneous/confusing messages when NFS
99 * is out of sync and requests old data. */
100 CDEBUG(D_INFO, "can't get object attrs, fid "DFID", rc %d\n",
104 rc = ll_prep_inode(&inode, req, sb, NULL);
105 ptlrpc_req_finished(req);
112 struct lustre_nfs_fid {
113 struct lu_fid lnf_child;
114 struct lu_fid lnf_parent;
117 static struct dentry *
118 ll_iget_for_nfs(struct super_block *sb, struct lu_fid *fid, struct lu_fid *parent)
121 struct dentry *result;
124 if (!fid_is_sane(fid))
125 RETURN(ERR_PTR(-ESTALE));
127 CDEBUG(D_INFO, "Get dentry for fid: "DFID"\n", PFID(fid));
129 inode = search_inode_for_lustre(sb, fid);
131 RETURN(ERR_PTR(PTR_ERR(inode)));
133 if (is_bad_inode(inode)) {
134 /* we didn't find the right inode.. */
136 RETURN(ERR_PTR(-ESTALE));
139 result = d_obtain_alias(inode);
140 if (IS_ERR(result)) {
148 #ifndef FILEID_INVALID
149 #define FILEID_INVALID 0xff
151 #ifndef FILEID_LUSTRE
152 #define FILEID_LUSTRE 0x97
156 * \a connectable - is nfsd will connect himself or this should be done
159 * The return value is file handle type:
160 * 1 -- contains child file handle;
161 * 2 -- contains child file handle and parent file handle;
164 #ifndef HAVE_ENCODE_FH_PARENT
165 static int ll_encode_fh(struct dentry *de, __u32 *fh, int *plen,
168 struct inode *inode = de->d_inode;
169 struct inode *parent = de->d_parent->d_inode;
171 static int ll_encode_fh(struct inode *inode, __u32 *fh, int *plen,
172 struct inode *parent)
175 int fileid_len = sizeof(struct lustre_nfs_fid) / 4;
176 struct lustre_nfs_fid *nfs_fid = (void *)fh;
179 CDEBUG(D_INFO, "%s: encoding for ("DFID") maxlen=%d minlen=%d\n",
180 ll_get_fsname(inode->i_sb, NULL, 0),
181 PFID(ll_inode2fid(inode)), *plen, fileid_len);
183 if (*plen < fileid_len) {
185 RETURN(FILEID_INVALID);
188 nfs_fid->lnf_child = *ll_inode2fid(inode);
190 nfs_fid->lnf_parent = *ll_inode2fid(parent);
192 fid_zero(&nfs_fid->lnf_parent);
195 RETURN(FILEID_LUSTRE);
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 = {
222 .lgd_fid = ll_i2info(child->d_inode)->lli_fid,
223 #ifdef HAVE_DIR_CONTEXT
224 .ctx.actor = ll_nfs_get_name_filldir,
228 struct md_op_data *op_data;
233 if (!dir || !S_ISDIR(dir->i_mode))
234 GOTO(out, rc = -ENOTDIR);
237 GOTO(out, rc = -EINVAL);
239 op_data = ll_prep_md_op_data(NULL, dir, dir, NULL, 0, 0,
240 LUSTRE_OPC_ANY, dir);
242 GOTO(out, rc = PTR_ERR(op_data));
244 op_data->op_max_pages = ll_i2sbi(dir)->ll_md_brw_pages;
245 mutex_lock(&dir->i_mutex);
246 #ifdef HAVE_DIR_CONTEXT
247 rc = ll_dir_read(dir, &pos, op_data, &lgd.ctx);
249 rc = ll_dir_read(dir, &pos, op_data, &lgd, ll_nfs_get_name_filldir);
251 mutex_unlock(&dir->i_mutex);
252 ll_finish_md_op_data(op_data);
253 if (!rc && !lgd.lgd_found)
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 != FILEID_LUSTRE)
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 != FILEID_LUSTRE)
277 RETURN(ERR_PTR(-EPROTO));
279 RETURN(ll_iget_for_nfs(sb, &nfs_fid->lnf_parent, NULL));
282 int ll_dir_get_parent_fid(struct inode *dir, struct lu_fid *parent_fid)
284 struct ptlrpc_request *req = NULL;
285 struct ll_sb_info *sbi;
286 struct mdt_body *body;
287 static const char dotdot[] = "..";
288 struct md_op_data *op_data;
293 LASSERT(dir && S_ISDIR(dir->i_mode));
295 sbi = ll_s2sbi(dir->i_sb);
297 CDEBUG(D_INFO, "%s: getting parent for ("DFID")\n",
298 ll_get_fsname(dir->i_sb, NULL, 0),
299 PFID(ll_inode2fid(dir)));
301 rc = ll_get_default_mdsize(sbi, &lmmsize);
305 op_data = ll_prep_md_op_data(NULL, dir, NULL, dotdot,
306 strlen(dotdot), lmmsize,
307 LUSTRE_OPC_ANY, NULL);
309 RETURN(PTR_ERR(op_data));
311 rc = md_getattr_name(sbi->ll_md_exp, op_data, &req);
312 ll_finish_md_op_data(op_data);
314 CERROR("%s: failure inode "DFID" get parent: rc = %d\n",
315 ll_get_fsname(dir->i_sb, NULL, 0),
316 PFID(ll_inode2fid(dir)), rc);
319 body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY);
322 * LU-3952: MDT may lost the FID of its parent, we should not crash
323 * the NFS server, ll_iget_for_nfs() will handle the error.
325 if (body->mbo_valid & OBD_MD_FLID) {
326 CDEBUG(D_INFO, "parent for "DFID" is "DFID"\n",
327 PFID(ll_inode2fid(dir)), PFID(&body->mbo_fid1));
328 *parent_fid = body->mbo_fid1;
331 ptlrpc_req_finished(req);
335 static struct dentry *ll_get_parent(struct dentry *dchild)
337 struct lu_fid parent_fid = { 0 };
339 struct dentry *dentry;
342 rc = ll_dir_get_parent_fid(dchild->d_inode, &parent_fid);
346 dentry = ll_iget_for_nfs(dchild->d_inode->i_sb, &parent_fid, NULL);
351 struct export_operations lustre_export_operations = {
352 .get_parent = ll_get_parent,
353 .encode_fh = ll_encode_fh,
354 .get_name = ll_get_name,
355 .fh_to_dentry = ll_fh_to_dentry,
356 .fh_to_parent = ll_fh_to_parent,