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));
140 * It is an anonymous dentry without OST objects created yet.
141 * We have to find the parent to tell MDS how to init lov objects.
143 if (S_ISREG(inode->i_mode) && !ll_i2info(inode)->lli_has_smd &&
144 parent != NULL && !fid_is_zero(parent)) {
145 struct ll_inode_info *lli = ll_i2info(inode);
147 spin_lock(&lli->lli_lock);
148 lli->lli_pfid = *parent;
149 spin_unlock(&lli->lli_lock);
152 result = d_obtain_alias(inode);
153 if (IS_ERR(result)) {
161 #ifndef FILEID_INVALID
162 #define FILEID_INVALID 0xff
164 #ifndef FILEID_LUSTRE
165 #define FILEID_LUSTRE 0x97
169 * \a connectable - is nfsd will connect himself or this should be done
172 * The return value is file handle type:
173 * 1 -- contains child file handle;
174 * 2 -- contains child file handle and parent file handle;
177 #ifndef HAVE_ENCODE_FH_PARENT
178 static int ll_encode_fh(struct dentry *de, __u32 *fh, int *plen,
181 struct inode *inode = de->d_inode;
182 struct inode *parent = de->d_parent->d_inode;
184 static int ll_encode_fh(struct inode *inode, __u32 *fh, int *plen,
185 struct inode *parent)
188 int fileid_len = sizeof(struct lustre_nfs_fid) / 4;
189 struct lustre_nfs_fid *nfs_fid = (void *)fh;
192 CDEBUG(D_INFO, "%s: encoding for ("DFID") maxlen=%d minlen=%d\n",
193 ll_get_fsname(inode->i_sb, NULL, 0),
194 PFID(ll_inode2fid(inode)), *plen, fileid_len);
196 if (*plen < fileid_len) {
198 RETURN(FILEID_INVALID);
201 nfs_fid->lnf_child = *ll_inode2fid(inode);
203 nfs_fid->lnf_parent = *ll_inode2fid(parent);
205 fid_zero(&nfs_fid->lnf_parent);
208 RETURN(FILEID_LUSTRE);
211 static int ll_nfs_get_name_filldir(void *cookie, const char *name, int namelen,
212 loff_t hash, u64 ino, unsigned type)
214 /* It is hack to access lde_fid for comparison with lgd_fid.
215 * So the input 'name' must be part of the 'lu_dirent'. */
216 struct lu_dirent *lde = container_of0(name, struct lu_dirent, lde_name);
217 struct ll_getname_data *lgd = cookie;
220 fid_le_to_cpu(&fid, &lde->lde_fid);
221 if (lu_fid_eq(&fid, &lgd->lgd_fid)) {
222 memcpy(lgd->lgd_name, name, namelen);
223 lgd->lgd_name[namelen] = 0;
226 return lgd->lgd_found;
229 static int ll_get_name(struct dentry *dentry, char *name,
230 struct dentry *child)
232 struct inode *dir = dentry->d_inode;
233 struct ll_getname_data lgd = {
235 .lgd_fid = ll_i2info(child->d_inode)->lli_fid,
236 #ifdef HAVE_DIR_CONTEXT
237 .ctx.actor = ll_nfs_get_name_filldir,
241 struct md_op_data *op_data;
245 if (!dir || !S_ISDIR(dir->i_mode))
246 GOTO(out, rc = -ENOTDIR);
249 GOTO(out, rc = -EINVAL);
251 op_data = ll_prep_md_op_data(NULL, dir, dir, NULL, 0, 0,
252 LUSTRE_OPC_ANY, dir);
254 GOTO(out, rc = PTR_ERR(op_data));
256 op_data->op_hash_offset = 0;
257 op_data->op_max_pages = ll_i2sbi(dir)->ll_md_brw_pages;
258 mutex_lock(&dir->i_mutex);
259 #ifdef HAVE_DIR_CONTEXT
260 rc = ll_dir_read(dir, op_data, &lgd.ctx);
262 rc = ll_dir_read(dir, op_data, &lgd, ll_nfs_get_name_filldir);
264 mutex_unlock(&dir->i_mutex);
265 ll_finish_md_op_data(op_data);
266 if (!rc && !lgd.lgd_found)
273 static struct dentry *ll_fh_to_dentry(struct super_block *sb, struct fid *fid,
274 int fh_len, int fh_type)
276 struct lustre_nfs_fid *nfs_fid = (struct lustre_nfs_fid *)fid;
278 if (fh_type != FILEID_LUSTRE)
279 RETURN(ERR_PTR(-EPROTO));
281 RETURN(ll_iget_for_nfs(sb, &nfs_fid->lnf_child, &nfs_fid->lnf_parent));
284 static struct dentry *ll_fh_to_parent(struct super_block *sb, struct fid *fid,
285 int fh_len, int fh_type)
287 struct lustre_nfs_fid *nfs_fid = (struct lustre_nfs_fid *)fid;
289 if (fh_type != FILEID_LUSTRE)
290 RETURN(ERR_PTR(-EPROTO));
292 RETURN(ll_iget_for_nfs(sb, &nfs_fid->lnf_parent, NULL));
295 static struct dentry *ll_get_parent(struct dentry *dchild)
297 struct ptlrpc_request *req = NULL;
298 struct inode *dir = dchild->d_inode;
299 struct ll_sb_info *sbi;
300 struct dentry *result = NULL;
301 struct mdt_body *body;
302 static char dotdot[] = "..";
303 struct md_op_data *op_data;
308 LASSERT(dir && S_ISDIR(dir->i_mode));
310 sbi = ll_s2sbi(dir->i_sb);
312 CDEBUG(D_INFO, "%s: getting parent for ("DFID")\n",
313 ll_get_fsname(dir->i_sb, NULL, 0),
314 PFID(ll_inode2fid(dir)));
316 rc = ll_get_default_mdsize(sbi, &lmmsize);
320 op_data = ll_prep_md_op_data(NULL, dir, NULL, dotdot,
321 strlen(dotdot), lmmsize,
322 LUSTRE_OPC_ANY, NULL);
324 RETURN((void *)op_data);
326 rc = md_getattr_name(sbi->ll_md_exp, op_data, &req);
327 ll_finish_md_op_data(op_data);
329 CERROR("%s: failure inode "DFID" get parent: rc = %d\n",
330 ll_get_fsname(dir->i_sb, NULL, 0),
331 PFID(ll_inode2fid(dir)), rc);
334 body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY);
336 * LU-3952: MDT may lost the FID of its parent, we should not crash
337 * the NFS server, ll_iget_for_nfs() will handle the error.
339 if (body->valid & OBD_MD_FLID) {
340 CDEBUG(D_INFO, "parent for "DFID" is "DFID"\n",
341 PFID(ll_inode2fid(dir)), PFID(&body->fid1));
343 result = ll_iget_for_nfs(dir->i_sb, &body->fid1, NULL);
345 ptlrpc_req_finished(req);
349 struct export_operations lustre_export_operations = {
350 .get_parent = ll_get_parent,
351 .encode_fh = ll_encode_fh,
352 .get_name = ll_get_name,
353 .fh_to_dentry = ll_fh_to_dentry,
354 .fh_to_parent = ll_fh_to_parent,