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.gnu.org/licenses/gpl-2.0.html
23 * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Use is subject to license terms.
26 * Copyright (c) 2011, 2012, Intel Corporation.
29 * This file is part of Lustre, http://www.lustre.org/
30 * Lustre is a trademark of Sun Microsystems, Inc.
32 * lustre/lustre/llite/llite_nfs.c
34 * NFS export of Lustre Light File System
36 * Author: Yury Umanets <umka@clusterfs.com>
37 * Author: Huang Hua <huanghua@clusterfs.com>
40 #define DEBUG_SUBSYSTEM S_LLITE
41 #include "llite_internal.h"
42 #include <linux/exportfs.h>
44 __u32 get_uuid2int(const char *name, int len)
46 __u32 key0 = 0x12a3fe2d, key1 = 0x37abe8f9;
49 __u32 key = key1 + (key0 ^ (*name++ * 7152373));
59 void get_uuid2fsid(const char *name, int len, __kernel_fsid_t *fsid)
61 __u64 key = 0, key0 = 0x12a3fe2d, key1 = 0x37abe8f9;
64 key = key1 + (key0 ^ (*name++ * 7152373));
65 if (key & 0x8000000000000000ULL)
66 key -= 0x7fffffffffffffffULL;
72 fsid->val[1] = key >> 32;
75 struct inode *search_inode_for_lustre(struct super_block *sb,
76 const struct lu_fid *fid)
78 struct ll_sb_info *sbi = ll_s2sbi(sb);
79 struct ptlrpc_request *req = NULL;
80 struct inode *inode = NULL;
82 unsigned long hash = cl_fid_build_ino(fid,
83 ll_need_32bit_api(sbi));
84 struct md_op_data *op_data;
87 CDEBUG(D_INFO, "searching inode for:(%lu," DFID ")\n", hash, PFID(fid));
89 inode = ilookup5(sb, hash, ll_test_inode_by_fid, (void *)fid);
93 rc = ll_get_default_mdsize(sbi, &eadatalen);
97 /* Because inode is NULL, ll_prep_md_op_data can not
98 * be used here. So we allocate op_data ourselves
100 op_data = kzalloc(sizeof(*op_data), GFP_NOFS);
102 return ERR_PTR(-ENOMEM);
104 op_data->op_fid1 = *fid;
105 op_data->op_mode = eadatalen;
106 op_data->op_valid = OBD_MD_FLEASIZE;
108 /* mds_fid2dentry ignores f_type */
109 rc = md_getattr(sbi->ll_md_exp, op_data, &req);
112 CDEBUG(D_INFO, "can't get object attrs, fid " DFID ", rc %d\n",
116 rc = ll_prep_inode(&inode, req, sb, NULL);
117 ptlrpc_req_finished(req);
124 struct lustre_nfs_fid {
125 struct lu_fid lnf_child;
126 struct lu_fid lnf_parent;
129 static struct dentry *
130 ll_iget_for_nfs(struct super_block *sb, struct lu_fid *fid, struct lu_fid *parent)
133 struct dentry *result;
135 if (!fid_is_sane(fid))
136 return ERR_PTR(-ESTALE);
138 CDEBUG(D_INFO, "Get dentry for fid: " DFID "\n", PFID(fid));
140 inode = search_inode_for_lustre(sb, fid);
142 return ERR_CAST(inode);
144 if (is_bad_inode(inode)) {
145 /* we didn't find the right inode.. */
147 return ERR_PTR(-ESTALE);
150 result = d_obtain_alias(inode);
151 if (IS_ERR(result)) {
157 * In case d_obtain_alias() found a disconnected dentry, always update
158 * lli_pfid to allow later operation (normally open) have parent fid,
159 * which may be used by MDS to create data.
162 struct ll_inode_info *lli = ll_i2info(inode);
164 spin_lock(&lli->lli_lock);
165 lli->lli_pfid = *parent;
166 spin_unlock(&lli->lli_lock);
169 /* N.B. d_obtain_alias() drops inode ref on error */
170 result = d_obtain_alias(inode);
171 if (!IS_ERR(result)) {
173 * Need to signal to the ll_intent_file_open that
174 * we came from NFS and so opencache needs to be
175 * enabled for this one
177 ll_d2d(result)->lld_nfs_dentry = 1;
184 * \a connectable - is nfsd will connect himself or this should be done
187 * The return value is file handle type:
188 * 1 -- contains child file handle;
189 * 2 -- contains child file handle and parent file handle;
192 static int ll_encode_fh(struct inode *inode, __u32 *fh, int *plen,
193 struct inode *parent)
195 int fileid_len = sizeof(struct lustre_nfs_fid) / 4;
196 struct lustre_nfs_fid *nfs_fid = (void *)fh;
198 CDEBUG(D_INFO, "%s: encoding for (" DFID ") maxlen=%d minlen=%d\n",
199 ll_get_fsname(inode->i_sb, NULL, 0),
200 PFID(ll_inode2fid(inode)), *plen, fileid_len);
202 if (*plen < fileid_len) {
204 return FILEID_INVALID;
207 nfs_fid->lnf_child = *ll_inode2fid(inode);
209 nfs_fid->lnf_parent = *ll_inode2fid(parent);
211 fid_zero(&nfs_fid->lnf_parent);
214 return FILEID_LUSTRE;
217 static int ll_nfs_get_name_filldir(struct dir_context *ctx, const char *name,
218 int namelen, loff_t hash, u64 ino,
221 /* It is hack to access lde_fid for comparison with lgd_fid.
222 * So the input 'name' must be part of the 'lu_dirent'.
224 struct lu_dirent *lde = container_of0(name, struct lu_dirent, lde_name);
225 struct ll_getname_data *lgd =
226 container_of(ctx, struct ll_getname_data, ctx);
229 fid_le_to_cpu(&fid, &lde->lde_fid);
230 if (lu_fid_eq(&fid, &lgd->lgd_fid)) {
231 memcpy(lgd->lgd_name, name, namelen);
232 lgd->lgd_name[namelen] = 0;
235 return lgd->lgd_found;
238 static int ll_get_name(struct dentry *dentry, char *name,
239 struct dentry *child)
241 struct inode *dir = d_inode(dentry);
243 struct ll_getname_data lgd = {
245 .lgd_fid = ll_i2info(d_inode(child))->lli_fid,
246 .ctx.actor = ll_nfs_get_name_filldir,
248 struct md_op_data *op_data;
251 if (!dir || !S_ISDIR(dir->i_mode)) {
261 op_data = ll_prep_md_op_data(NULL, dir, dir, NULL, 0, 0,
262 LUSTRE_OPC_ANY, dir);
263 if (IS_ERR(op_data)) {
264 rc = PTR_ERR(op_data);
268 op_data->op_max_pages = ll_i2sbi(dir)->ll_md_brw_pages;
270 rc = ll_dir_read(dir, &pos, op_data, &lgd.ctx);
272 ll_finish_md_op_data(op_data);
273 if (!rc && !lgd.lgd_found)
279 static struct dentry *ll_fh_to_dentry(struct super_block *sb, struct fid *fid,
280 int fh_len, int fh_type)
282 struct lustre_nfs_fid *nfs_fid = (struct lustre_nfs_fid *)fid;
284 if (fh_type != FILEID_LUSTRE)
285 return ERR_PTR(-EPROTO);
287 return ll_iget_for_nfs(sb, &nfs_fid->lnf_child, &nfs_fid->lnf_parent);
290 static struct dentry *ll_fh_to_parent(struct super_block *sb, struct fid *fid,
291 int fh_len, int fh_type)
293 struct lustre_nfs_fid *nfs_fid = (struct lustre_nfs_fid *)fid;
295 if (fh_type != FILEID_LUSTRE)
296 return ERR_PTR(-EPROTO);
298 return ll_iget_for_nfs(sb, &nfs_fid->lnf_parent, NULL);
301 int ll_dir_get_parent_fid(struct inode *dir, struct lu_fid *parent_fid)
303 struct ptlrpc_request *req = NULL;
304 struct ll_sb_info *sbi;
305 struct mdt_body *body;
306 static const char dotdot[] = "..";
307 struct md_op_data *op_data;
311 LASSERT(dir && S_ISDIR(dir->i_mode));
313 sbi = ll_s2sbi(dir->i_sb);
315 CDEBUG(D_INFO, "%s: getting parent for (" DFID ")\n",
316 ll_get_fsname(dir->i_sb, NULL, 0),
317 PFID(ll_inode2fid(dir)));
319 rc = ll_get_default_mdsize(sbi, &lmmsize);
323 op_data = ll_prep_md_op_data(NULL, dir, NULL, dotdot,
324 strlen(dotdot), lmmsize,
325 LUSTRE_OPC_ANY, NULL);
327 return PTR_ERR(op_data);
329 rc = md_getattr_name(sbi->ll_md_exp, op_data, &req);
330 ll_finish_md_op_data(op_data);
332 CERROR("%s: failure inode " DFID " get parent: rc = %d\n",
333 ll_get_fsname(dir->i_sb, NULL, 0),
334 PFID(ll_inode2fid(dir)), rc);
337 body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY);
339 * LU-3952: MDT may lost the FID of its parent, we should not crash
340 * the NFS server, ll_iget_for_nfs() will handle the error.
342 if (body->mbo_valid & OBD_MD_FLID) {
343 CDEBUG(D_INFO, "parent for " DFID " is " DFID "\n",
344 PFID(ll_inode2fid(dir)), PFID(&body->mbo_fid1));
345 *parent_fid = body->mbo_fid1;
348 ptlrpc_req_finished(req);
352 static struct dentry *ll_get_parent(struct dentry *dchild)
354 struct lu_fid parent_fid = { 0 };
355 struct dentry *dentry;
358 rc = ll_dir_get_parent_fid(dchild->d_inode, &parent_fid);
362 dentry = ll_iget_for_nfs(dchild->d_inode->i_sb, &parent_fid, NULL);
367 const struct export_operations lustre_export_operations = {
368 .get_parent = ll_get_parent,
369 .encode_fh = ll_encode_fh,
370 .get_name = ll_get_name,
371 .fh_to_dentry = ll_fh_to_dentry,
372 .fh_to_parent = ll_fh_to_parent,