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, 2014, 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 "llite_internal.h"
46 #include <linux/exportfs.h>
48 __u32 get_uuid2int(const char *name, int len)
50 __u32 key0 = 0x12a3fe2d, key1 = 0x37abe8f9;
52 __u32 key = key1 + (key0 ^ (*name++ * 7152373));
53 if (key & 0x80000000) key -= 0x7fffffff;
60 struct inode *search_inode_for_lustre(struct super_block *sb,
61 const struct lu_fid *fid)
63 struct ll_sb_info *sbi = ll_s2sbi(sb);
64 struct ptlrpc_request *req = NULL;
65 struct inode *inode = NULL;
67 unsigned long hash = cl_fid_build_ino(fid,
68 ll_need_32bit_api(sbi));
69 struct md_op_data *op_data;
73 CDEBUG(D_INFO, "searching inode for:(%lu,"DFID")\n", hash, PFID(fid));
75 inode = ilookup5(sb, hash, ll_test_inode_by_fid, (void *)fid);
79 rc = ll_get_default_mdsize(sbi, &eadatalen);
83 /* Because inode is NULL, ll_prep_md_op_data can not
84 * be used here. So we allocate op_data ourselves */
85 OBD_ALLOC_PTR(op_data);
87 return ERR_PTR(-ENOMEM);
89 op_data->op_fid1 = *fid;
90 op_data->op_mode = eadatalen;
91 op_data->op_valid = OBD_MD_FLEASIZE;
93 /* mds_fid2dentry ignores f_type */
94 rc = md_getattr(sbi->ll_md_exp, op_data, &req);
95 OBD_FREE_PTR(op_data);
97 /* Suppress erroneous/confusing messages when NFS
98 * is out of sync and requests old data. */
99 CDEBUG(D_INFO, "can't get object attrs, fid "DFID", rc %d\n",
103 rc = ll_prep_inode(&inode, req, sb, NULL);
104 ptlrpc_req_finished(req);
111 struct lustre_nfs_fid {
112 struct lu_fid lnf_child;
113 struct lu_fid lnf_parent;
116 static struct dentry *
117 ll_iget_for_nfs(struct super_block *sb, struct lu_fid *fid, struct lu_fid *parent)
120 struct dentry *result;
123 if (!fid_is_sane(fid))
124 RETURN(ERR_PTR(-ESTALE));
126 CDEBUG(D_INFO, "Get dentry for fid: "DFID"\n", PFID(fid));
128 inode = search_inode_for_lustre(sb, fid);
130 RETURN(ERR_PTR(PTR_ERR(inode)));
132 if (is_bad_inode(inode)) {
133 /* we didn't find the right inode.. */
135 RETURN(ERR_PTR(-ESTALE));
138 result = d_obtain_alias(inode);
139 if (IS_ERR(result)) {
147 #ifndef FILEID_INVALID
148 #define FILEID_INVALID 0xff
150 #ifndef FILEID_LUSTRE
151 #define FILEID_LUSTRE 0x97
155 * \a connectable - is nfsd will connect himself or this should be done
158 * The return value is file handle type:
159 * 1 -- contains child file handle;
160 * 2 -- contains child file handle and parent file handle;
163 #ifndef HAVE_ENCODE_FH_PARENT
164 static int ll_encode_fh(struct dentry *de, __u32 *fh, int *plen,
167 struct inode *inode = de->d_inode;
168 struct inode *parent = de->d_parent->d_inode;
170 static int ll_encode_fh(struct inode *inode, __u32 *fh, int *plen,
171 struct inode *parent)
174 int fileid_len = sizeof(struct lustre_nfs_fid) / 4;
175 struct lustre_nfs_fid *nfs_fid = (void *)fh;
178 CDEBUG(D_INFO, "%s: encoding for ("DFID") maxlen=%d minlen=%d\n",
179 ll_get_fsname(inode->i_sb, NULL, 0),
180 PFID(ll_inode2fid(inode)), *plen, fileid_len);
182 if (*plen < fileid_len) {
184 RETURN(FILEID_INVALID);
187 nfs_fid->lnf_child = *ll_inode2fid(inode);
189 nfs_fid->lnf_parent = *ll_inode2fid(parent);
191 fid_zero(&nfs_fid->lnf_parent);
194 RETURN(FILEID_LUSTRE);
197 static int ll_nfs_get_name_filldir(void *cookie, const char *name, int namelen,
198 loff_t hash, u64 ino, unsigned type)
200 /* It is hack to access lde_fid for comparison with lgd_fid.
201 * So the input 'name' must be part of the 'lu_dirent'. */
202 struct lu_dirent *lde = container_of0(name, struct lu_dirent, lde_name);
203 struct ll_getname_data *lgd = cookie;
206 fid_le_to_cpu(&fid, &lde->lde_fid);
207 if (lu_fid_eq(&fid, &lgd->lgd_fid)) {
208 memcpy(lgd->lgd_name, name, namelen);
209 lgd->lgd_name[namelen] = 0;
212 return lgd->lgd_found;
215 static int ll_get_name(struct dentry *dentry, char *name,
216 struct dentry *child)
218 struct inode *dir = dentry->d_inode;
219 struct ll_getname_data lgd = {
221 .lgd_fid = ll_i2info(child->d_inode)->lli_fid,
222 #ifdef HAVE_DIR_CONTEXT
223 .ctx.actor = ll_nfs_get_name_filldir,
227 struct md_op_data *op_data;
232 if (!dir || !S_ISDIR(dir->i_mode))
233 GOTO(out, rc = -ENOTDIR);
236 GOTO(out, rc = -EINVAL);
238 op_data = ll_prep_md_op_data(NULL, dir, dir, NULL, 0, 0,
239 LUSTRE_OPC_ANY, dir);
241 GOTO(out, rc = PTR_ERR(op_data));
243 op_data->op_max_pages = ll_i2sbi(dir)->ll_md_brw_pages;
244 mutex_lock(&dir->i_mutex);
245 #ifdef HAVE_DIR_CONTEXT
246 rc = ll_dir_read(dir, &pos, op_data, &lgd.ctx);
248 rc = ll_dir_read(dir, &pos, op_data, &lgd, ll_nfs_get_name_filldir);
250 mutex_unlock(&dir->i_mutex);
251 ll_finish_md_op_data(op_data);
252 if (!rc && !lgd.lgd_found)
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 != FILEID_LUSTRE)
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 != FILEID_LUSTRE)
276 RETURN(ERR_PTR(-EPROTO));
278 RETURN(ll_iget_for_nfs(sb, &nfs_fid->lnf_parent, NULL));
281 int ll_dir_get_parent_fid(struct inode *dir, struct lu_fid *parent_fid)
283 struct ptlrpc_request *req = NULL;
284 struct ll_sb_info *sbi;
285 struct mdt_body *body;
286 static const char dotdot[] = "..";
287 struct md_op_data *op_data;
292 LASSERT(dir && S_ISDIR(dir->i_mode));
294 sbi = ll_s2sbi(dir->i_sb);
296 CDEBUG(D_INFO, "%s: getting parent for ("DFID")\n",
297 ll_get_fsname(dir->i_sb, NULL, 0),
298 PFID(ll_inode2fid(dir)));
300 rc = ll_get_default_mdsize(sbi, &lmmsize);
304 op_data = ll_prep_md_op_data(NULL, dir, NULL, dotdot,
305 strlen(dotdot), lmmsize,
306 LUSTRE_OPC_ANY, NULL);
308 RETURN(PTR_ERR(op_data));
310 rc = md_getattr_name(sbi->ll_md_exp, op_data, &req);
311 ll_finish_md_op_data(op_data);
313 CERROR("%s: failure inode "DFID" get parent: rc = %d\n",
314 ll_get_fsname(dir->i_sb, NULL, 0),
315 PFID(ll_inode2fid(dir)), rc);
318 body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY);
321 * LU-3952: MDT may lost the FID of its parent, we should not crash
322 * the NFS server, ll_iget_for_nfs() will handle the error.
324 if (body->mbo_valid & OBD_MD_FLID) {
325 CDEBUG(D_INFO, "parent for "DFID" is "DFID"\n",
326 PFID(ll_inode2fid(dir)), PFID(&body->mbo_fid1));
327 *parent_fid = body->mbo_fid1;
330 ptlrpc_req_finished(req);
334 static struct dentry *ll_get_parent(struct dentry *dchild)
336 struct lu_fid parent_fid = { 0 };
338 struct dentry *dentry;
341 rc = ll_dir_get_parent_fid(dchild->d_inode, &parent_fid);
345 dentry = ll_iget_for_nfs(dchild->d_inode->i_sb, &parent_fid, NULL);
350 struct export_operations lustre_export_operations = {
351 .get_parent = ll_get_parent,
352 .encode_fh = ll_encode_fh,
353 .get_name = ll_get_name,
354 .fh_to_dentry = ll_fh_to_dentry,
355 .fh_to_parent = ll_fh_to_parent,