1 // SPDX-License-Identifier: GPL-2.0
5 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 only,
9 * as published by the Free Software Foundation.
11 * This program is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * General Public License version 2 for more details (a copy is included
15 * in the LICENSE file that accompanied this code).
17 * You should have received a copy of the GNU General Public License
18 * version 2 along with this program; If not, see
19 * http://www.gnu.org/licenses/gpl-2.0.html
24 * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
25 * Use is subject to license terms.
27 * Copyright (c) 2011, 2012, Intel Corporation.
30 * This file is part of Lustre, http://www.lustre.org/
31 * Lustre is a trademark of Sun Microsystems, Inc.
33 * lustre/lustre/llite/llite_nfs.c
35 * NFS export of Lustre Light File System
37 * Author: Yury Umanets <umka@clusterfs.com>
38 * Author: Huang Hua <huanghua@clusterfs.com>
41 #define DEBUG_SUBSYSTEM S_LLITE
42 #include "llite_internal.h"
43 #include <linux/exportfs.h>
45 __u32 get_uuid2int(const char *name, int len)
47 __u32 key0 = 0x12a3fe2d, key1 = 0x37abe8f9;
50 __u32 key = key1 + (key0 ^ (*name++ * 7152373));
60 void get_uuid2fsid(const char *name, int len, __kernel_fsid_t *fsid)
62 __u64 key = 0, key0 = 0x12a3fe2d, key1 = 0x37abe8f9;
65 key = key1 + (key0 ^ (*name++ * 7152373));
66 if (key & 0x8000000000000000ULL)
67 key -= 0x7fffffffffffffffULL;
73 fsid->val[1] = key >> 32;
76 struct inode *search_inode_for_lustre(struct super_block *sb,
77 const struct lu_fid *fid)
79 struct ll_sb_info *sbi = ll_s2sbi(sb);
80 struct ptlrpc_request *req = NULL;
81 struct inode *inode = NULL;
83 unsigned long hash = cl_fid_build_ino(fid,
84 ll_need_32bit_api(sbi));
85 struct md_op_data *op_data;
88 CDEBUG(D_INFO, "searching inode for:(%lu," DFID ")\n", hash, PFID(fid));
90 inode = ilookup5(sb, hash, ll_test_inode_by_fid, (void *)fid);
94 rc = ll_get_default_mdsize(sbi, &eadatalen);
98 /* Because inode is NULL, ll_prep_md_op_data can not
99 * be used here. So we allocate op_data ourselves
101 op_data = kzalloc(sizeof(*op_data), GFP_NOFS);
103 return ERR_PTR(-ENOMEM);
105 op_data->op_fid1 = *fid;
106 op_data->op_mode = eadatalen;
107 op_data->op_valid = OBD_MD_FLEASIZE;
109 /* mds_fid2dentry ignores f_type */
110 rc = md_getattr(sbi->ll_md_exp, op_data, &req);
113 CDEBUG(D_INFO, "can't get object attrs, fid " DFID ", rc %d\n",
117 rc = ll_prep_inode(&inode, req, sb, NULL);
118 ptlrpc_req_finished(req);
125 struct lustre_nfs_fid {
126 struct lu_fid lnf_child;
127 struct lu_fid lnf_parent;
130 static struct dentry *
131 ll_iget_for_nfs(struct super_block *sb,
132 struct lu_fid *fid, struct lu_fid *parent)
135 struct dentry *result;
137 if (!fid_is_sane(fid))
138 return ERR_PTR(-ESTALE);
140 CDEBUG(D_INFO, "Get dentry for fid: " DFID "\n", PFID(fid));
142 inode = search_inode_for_lustre(sb, fid);
144 return ERR_CAST(inode);
146 if (is_bad_inode(inode)) {
147 /* we didn't find the right inode.. */
149 return ERR_PTR(-ESTALE);
152 result = d_obtain_alias(inode);
153 if (IS_ERR(result)) {
159 * In case d_obtain_alias() found a disconnected dentry, always update
160 * lli_pfid to allow later operation (normally open) have parent fid,
161 * which may be used by MDS to create data.
164 struct ll_inode_info *lli = ll_i2info(inode);
166 spin_lock(&lli->lli_lock);
167 lli->lli_pfid = *parent;
168 spin_unlock(&lli->lli_lock);
171 /* N.B. d_obtain_alias() drops inode ref on error */
172 result = d_obtain_alias(inode);
173 if (!IS_ERR(result)) {
175 * Need to signal to the ll_intent_file_open that
176 * we came from NFS and so opencache needs to be
177 * enabled for this one
179 ll_d2d(result)->lld_nfs_dentry = 1;
186 * \a connectable - is nfsd will connect himself or this should be done
189 * The return value is file handle type:
190 * 1 -- contains child file handle;
191 * 2 -- contains child file handle and parent file handle;
194 static int ll_encode_fh(struct inode *inode, __u32 *fh, int *plen,
195 struct inode *parent)
197 int fileid_len = sizeof(struct lustre_nfs_fid) / 4;
198 struct lustre_nfs_fid *nfs_fid = (void *)fh;
200 CDEBUG(D_INFO, "%s: encoding for (" DFID ") maxlen=%d minlen=%d\n",
201 ll_get_fsname(inode->i_sb, NULL, 0),
202 PFID(ll_inode2fid(inode)), *plen, fileid_len);
204 if (*plen < fileid_len) {
206 return FILEID_INVALID;
209 nfs_fid->lnf_child = *ll_inode2fid(inode);
211 nfs_fid->lnf_parent = *ll_inode2fid(parent);
213 fid_zero(&nfs_fid->lnf_parent);
216 return FILEID_LUSTRE;
219 static int ll_nfs_get_name_filldir(struct dir_context *ctx, const char *name,
220 int namelen, loff_t hash, u64 ino,
223 /* It is hack to access lde_fid for comparison with lgd_fid.
224 * So the input 'name' must be part of the 'lu_dirent'.
226 struct lu_dirent *lde = container_of0(name, struct lu_dirent, lde_name);
227 struct ll_getname_data *lgd =
228 container_of(ctx, struct ll_getname_data, ctx);
231 fid_le_to_cpu(&fid, &lde->lde_fid);
232 if (lu_fid_eq(&fid, &lgd->lgd_fid)) {
233 memcpy(lgd->lgd_name, name, namelen);
234 lgd->lgd_name[namelen] = 0;
237 return lgd->lgd_found;
240 static int ll_get_name(struct dentry *dentry, char *name,
241 struct dentry *child)
243 struct inode *dir = d_inode(dentry);
245 struct ll_getname_data lgd = {
247 .lgd_fid = ll_i2info(d_inode(child))->lli_fid,
248 .ctx.actor = ll_nfs_get_name_filldir,
250 struct md_op_data *op_data;
253 if (!dir || !S_ISDIR(dir->i_mode)) {
263 op_data = ll_prep_md_op_data(NULL, dir, dir, NULL, 0, 0,
264 LUSTRE_OPC_ANY, dir);
265 if (IS_ERR(op_data)) {
266 rc = PTR_ERR(op_data);
270 op_data->op_max_pages = ll_i2sbi(dir)->ll_md_brw_pages;
272 rc = ll_dir_read(dir, &pos, op_data, &lgd.ctx);
274 ll_finish_md_op_data(op_data);
275 if (!rc && !lgd.lgd_found)
281 static struct dentry *ll_fh_to_dentry(struct super_block *sb, struct fid *fid,
282 int fh_len, int fh_type)
284 struct lustre_nfs_fid *nfs_fid = (struct lustre_nfs_fid *)fid;
286 if (fh_type != FILEID_LUSTRE)
287 return ERR_PTR(-EPROTO);
289 return ll_iget_for_nfs(sb, &nfs_fid->lnf_child, &nfs_fid->lnf_parent);
292 static struct dentry *ll_fh_to_parent(struct super_block *sb, struct fid *fid,
293 int fh_len, int fh_type)
295 struct lustre_nfs_fid *nfs_fid = (struct lustre_nfs_fid *)fid;
297 if (fh_type != FILEID_LUSTRE)
298 return ERR_PTR(-EPROTO);
300 return ll_iget_for_nfs(sb, &nfs_fid->lnf_parent, NULL);
303 int ll_dir_get_parent_fid(struct inode *dir, struct lu_fid *parent_fid)
305 struct ptlrpc_request *req = NULL;
306 struct ll_sb_info *sbi;
307 struct mdt_body *body;
308 static const char dotdot[] = "..";
309 struct md_op_data *op_data;
313 LASSERT(dir && S_ISDIR(dir->i_mode));
315 sbi = ll_s2sbi(dir->i_sb);
317 CDEBUG(D_INFO, "%s: getting parent for (" DFID ")\n",
318 ll_get_fsname(dir->i_sb, NULL, 0),
319 PFID(ll_inode2fid(dir)));
321 rc = ll_get_default_mdsize(sbi, &lmmsize);
325 op_data = ll_prep_md_op_data(NULL, dir, NULL, dotdot,
326 strlen(dotdot), lmmsize,
327 LUSTRE_OPC_ANY, NULL);
329 return PTR_ERR(op_data);
331 rc = md_getattr_name(sbi->ll_md_exp, op_data, &req);
332 ll_finish_md_op_data(op_data);
334 CERROR("%s: failure inode " DFID " get parent: rc = %d\n",
335 ll_get_fsname(dir->i_sb, NULL, 0),
336 PFID(ll_inode2fid(dir)), rc);
339 body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY);
341 * LU-3952: MDT may lost the FID of its parent, we should not crash
342 * the NFS server, ll_iget_for_nfs() will handle the error.
344 if (body->mbo_valid & OBD_MD_FLID) {
345 CDEBUG(D_INFO, "parent for " DFID " is " DFID "\n",
346 PFID(ll_inode2fid(dir)), PFID(&body->mbo_fid1));
347 *parent_fid = body->mbo_fid1;
350 ptlrpc_req_finished(req);
354 static struct dentry *ll_get_parent(struct dentry *dchild)
356 struct lu_fid parent_fid = { 0 };
357 struct dentry *dentry;
360 rc = ll_dir_get_parent_fid(dchild->d_inode, &parent_fid);
364 dentry = ll_iget_for_nfs(dchild->d_inode->i_sb, &parent_fid, NULL);
369 const struct export_operations lustre_export_operations = {
370 .get_parent = ll_get_parent,
371 .encode_fh = ll_encode_fh,
372 .get_name = ll_get_name,
373 .fh_to_dentry = ll_fh_to_dentry,
374 .fh_to_parent = ll_fh_to_parent,