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, 2017, 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));
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, ll_need_32bit_api(sbi));
68 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);
84 * Because inode is NULL, ll_prep_md_op_data can not
85 * be used here. So we allocate op_data ourselves
87 OBD_ALLOC_PTR(op_data);
89 return ERR_PTR(-ENOMEM);
91 op_data->op_fid1 = *fid;
92 op_data->op_mode = eadatalen;
93 op_data->op_valid = OBD_MD_FLEASIZE;
95 /* mds_fid2dentry ignores f_type */
96 rc = md_getattr(sbi->ll_md_exp, op_data, &req);
97 OBD_FREE_PTR(op_data);
100 * Suppress erroneous/confusing messages when NFS
101 * is out of sync and requests old data.
103 CDEBUG(D_INFO, "can't get object attrs, fid "DFID", rc %d\n",
107 rc = ll_prep_inode(&inode, req, sb, NULL);
108 ptlrpc_req_finished(req);
115 static struct dentry *
116 ll_iget_for_nfs(struct super_block *sb, struct lu_fid *fid, struct lu_fid *parent)
119 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_CAST(inode));
132 if (is_bad_inode(inode)) {
133 /* we didn't find the right inode.. */
135 RETURN(ERR_PTR(-ESTALE));
138 /* N.B. d_obtain_alias() drops inode ref on error */
139 result = d_obtain_alias(inode);
140 if (!IS_ERR(result)) {
143 rc = ll_d_init(result);
146 result = ERR_PTR(rc);
148 struct ll_dentry_data *ldd = ll_d2d(result);
151 * Need to signal to the ll_file_open that
152 * we came from NFS and so opencache needs to be
153 * enabled for this one
155 spin_lock(&result->d_lock);
156 ldd->lld_nfs_dentry = 1;
157 spin_unlock(&result->d_lock);
164 #ifndef FILEID_INVALID
165 #define FILEID_INVALID 0xff
167 #ifndef FILEID_LUSTRE
168 #define FILEID_LUSTRE 0x97
172 * \a connectable - is nfsd will connect himself or this should be done
175 * The return value is file handle type:
176 * 1 -- contains child file handle;
177 * 2 -- contains child file handle and parent file handle;
180 static int ll_encode_fh(struct inode *inode, u32 *fh, int *plen,
181 struct inode *parent)
183 int fileid_len = sizeof(struct lustre_file_handle) / 4;
184 struct lustre_file_handle *lfh = (void *)fh;
188 CDEBUG(D_INFO, "%s: encoding for ("DFID") maxlen=%d minlen=%d\n",
189 ll_i2sbi(inode)->ll_fsname,
190 PFID(ll_inode2fid(inode)), *plen, fileid_len);
192 if (*plen < fileid_len) {
194 RETURN(FILEID_INVALID);
197 lfh->lfh_child = *ll_inode2fid(inode);
199 lfh->lfh_parent = *ll_inode2fid(parent);
201 fid_zero(&lfh->lfh_parent);
204 RETURN(FILEID_LUSTRE);
208 #ifndef HAVE_FILLDIR_USE_CTX
209 ll_nfs_get_name_filldir(void *cookie, const char *name, int namelen,
210 loff_t hash, u64 ino, unsigned type)
212 struct ll_getname_data *lgd = cookie;
214 ll_nfs_get_name_filldir(struct dir_context *ctx, const char *name, int namelen,
215 loff_t hash, u64 ino, unsigned type)
217 struct ll_getname_data *lgd =
218 container_of(ctx, struct ll_getname_data, ctx);
219 #endif /* HAVE_FILLDIR_USE_CTX */
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', and
223 * so must appear to be a non-const pointer to an empty array.
225 char (*n)[0] = (void *)name;
226 /* NOTE: This should be container_of(). However container_of() in
227 * kernels earlier than v4.13-rc1~37^2~94 cause this to generate a
228 * warning, which fails when we compile with -Werror. Those earlier
229 * kernels don't have container_of_safe, calling that instead will use
230 * the lustre-local version which doesn't generate the warning.
232 struct lu_dirent *lde = container_of_safe(n, struct lu_dirent, lde_name);
235 fid_le_to_cpu(&fid, &lde->lde_fid);
236 if (lu_fid_eq(&fid, &lgd->lgd_fid)) {
237 memcpy(lgd->lgd_name, name, namelen);
238 lgd->lgd_name[namelen] = 0;
241 return lgd->lgd_found;
244 static int ll_get_name(struct dentry *dentry, char *name,
245 struct dentry *child)
247 struct inode *dir = dentry->d_inode;
248 struct ll_getname_data lgd = {
250 .lgd_fid = ll_i2info(child->d_inode)->lli_fid,
251 #ifdef HAVE_DIR_CONTEXT
252 .ctx.actor = ll_nfs_get_name_filldir,
256 struct md_op_data *op_data;
262 if (!dir || !S_ISDIR(dir->i_mode))
263 GOTO(out, rc = -ENOTDIR);
266 GOTO(out, rc = -EINVAL);
268 op_data = ll_prep_md_op_data(NULL, dir, dir, NULL, 0, 0,
269 LUSTRE_OPC_ANY, dir);
271 GOTO(out, rc = PTR_ERR(op_data));
274 #ifdef HAVE_DIR_CONTEXT
275 rc = ll_dir_read(dir, &pos, op_data, &lgd.ctx);
277 rc = ll_dir_read(dir, &pos, op_data, &lgd, ll_nfs_get_name_filldir);
280 ll_finish_md_op_data(op_data);
281 if (!rc && !lgd.lgd_found)
288 static struct dentry *ll_fh_to_dentry(struct super_block *sb, struct fid *fid,
289 int fh_len, int fh_type)
291 struct lustre_file_handle *lfh = (struct lustre_file_handle *)fid;
293 if (fh_type != FILEID_LUSTRE)
294 RETURN(ERR_PTR(-EPROTO));
296 RETURN(ll_iget_for_nfs(sb, &lfh->lfh_child, &lfh->lfh_parent));
299 static struct dentry *ll_fh_to_parent(struct super_block *sb, struct fid *fid,
300 int fh_len, int fh_type)
302 struct lustre_file_handle *lfh = (struct lustre_file_handle *)fid;
304 if (fh_type != FILEID_LUSTRE)
305 RETURN(ERR_PTR(-EPROTO));
307 RETURN(ll_iget_for_nfs(sb, &lfh->lfh_parent, NULL));
310 int ll_dir_get_parent_fid(struct inode *dir, struct lu_fid *parent_fid)
312 struct ptlrpc_request *req = NULL;
313 struct ll_sb_info *sbi;
314 struct mdt_body *body;
315 static const char dotdot[] = "..";
316 struct md_op_data *op_data;
322 LASSERT(dir && S_ISDIR(dir->i_mode));
324 sbi = ll_s2sbi(dir->i_sb);
326 CDEBUG(D_INFO, "%s: getting parent for ("DFID")\n",
327 sbi->ll_fsname, PFID(ll_inode2fid(dir)));
329 rc = ll_get_default_mdsize(sbi, &lmmsize);
333 op_data = ll_prep_md_op_data(NULL, dir, NULL, dotdot,
334 strlen(dotdot), lmmsize,
335 LUSTRE_OPC_ANY, NULL);
337 RETURN(PTR_ERR(op_data));
339 rc = md_getattr_name(sbi->ll_md_exp, op_data, &req);
340 ll_finish_md_op_data(op_data);
342 CERROR("%s: failure inode "DFID" get parent: rc = %d\n",
343 sbi->ll_fsname, PFID(ll_inode2fid(dir)), rc);
346 body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY);
349 * LU-3952: MDT may lost the FID of its parent, we should not crash
350 * the NFS server, ll_iget_for_nfs() will handle the error.
352 if (body->mbo_valid & OBD_MD_FLID) {
353 CDEBUG(D_INFO, "parent for "DFID" is "DFID"\n",
354 PFID(ll_inode2fid(dir)), PFID(&body->mbo_fid1));
355 *parent_fid = body->mbo_fid1;
358 ptlrpc_req_finished(req);
362 static struct dentry *ll_get_parent(struct dentry *dchild)
364 struct lu_fid parent_fid = { 0 };
366 struct dentry *dentry;
370 rc = ll_dir_get_parent_fid(dchild->d_inode, &parent_fid);
374 dentry = ll_iget_for_nfs(dchild->d_inode->i_sb, &parent_fid, NULL);
379 const struct export_operations lustre_export_operations = {
380 .get_parent = ll_get_parent,
381 .encode_fh = ll_encode_fh,
382 .get_name = ll_get_name,
383 .fh_to_dentry = ll_fh_to_dentry,
384 .fh_to_parent = ll_fh_to_parent,