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/
31 * lustre/lustre/llite/llite_nfs.c
33 * NFS export of Lustre Light File System
35 * Author: Yury Umanets <umka@clusterfs.com>
36 * Author: Huang Hua <huanghua@clusterfs.com>
39 #define DEBUG_SUBSYSTEM S_LLITE
40 #include "llite_internal.h"
41 #include <linux/exportfs.h>
43 u32 get_uuid2int(const char *name, int len)
45 u32 key0 = 0x12a3fe2d, key1 = 0x37abe8f9;
48 u32 key = key1 + (key0 ^ (*name++ * 7152373));
59 struct inode *search_inode_for_lustre(struct super_block *sb,
60 const struct lu_fid *fid)
62 struct ll_sb_info *sbi = ll_s2sbi(sb);
63 struct ptlrpc_request *req = NULL;
64 struct inode *inode = NULL;
66 unsigned long hash = cl_fid_build_ino(fid, ll_need_32bit_api(sbi));
67 struct md_op_data *op_data;
72 CDEBUG(D_INFO, "searching inode for:(%lu,"DFID")\n", hash, PFID(fid));
74 inode = ilookup5(sb, hash, ll_test_inode_by_fid, (void *)fid);
78 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
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);
99 * Suppress erroneous/confusing messages when NFS
100 * is out of sync and requests old data.
102 CDEBUG(D_INFO, "can't get object attrs, fid "DFID", rc %d\n",
106 rc = ll_prep_inode(&inode, &req->rq_pill, sb, NULL);
107 ptlrpc_req_finished(req);
114 static struct dentry *
115 ll_iget_for_nfs(struct super_block *sb, struct lu_fid *fid, struct lu_fid *parent)
118 struct dentry *result;
122 if (!fid_is_sane(fid))
123 RETURN(ERR_PTR(-ESTALE));
125 CDEBUG(D_INFO, "Get dentry for fid: "DFID"\n", PFID(fid));
127 inode = search_inode_for_lustre(sb, fid);
129 RETURN(ERR_CAST(inode));
131 if (is_bad_inode(inode)) {
132 /* we didn't find the right inode.. */
134 RETURN(ERR_PTR(-ESTALE));
137 /* N.B. d_obtain_alias() drops inode ref on error */
138 result = d_obtain_alias(inode);
139 if (!IS_ERR(result)) {
140 struct ll_dentry_data *ldd;
142 if (!ll_d_setup(result, true))
143 RETURN(ERR_PTR(-ENOMEM));
144 ldd = ll_d2d(result);
146 * Need to signal to the ll_file_open that
147 * we came from NFS and so opencache needs to be
148 * enabled for this one
150 spin_lock(&result->d_lock);
151 ldd->lld_nfs_dentry = 1;
152 spin_unlock(&result->d_lock);
158 #ifndef FILEID_INVALID
159 #define FILEID_INVALID 0xff
161 #ifndef FILEID_LUSTRE
162 #define FILEID_LUSTRE 0x97
166 * \a connectable - is nfsd will connect himself or this should be done
169 * The return value is file handle type:
170 * 1 -- contains child file handle;
171 * 2 -- contains child file handle and parent file handle;
174 static int ll_encode_fh(struct inode *inode, u32 *fh, int *plen,
175 struct inode *parent)
177 int fileid_len = sizeof(struct lustre_file_handle) / 4;
178 struct lustre_file_handle *lfh = (void *)fh;
182 CDEBUG(D_INFO, "%s: encoding for ("DFID") maxlen=%d minlen=%d\n",
183 ll_i2sbi(inode)->ll_fsname,
184 PFID(ll_inode2fid(inode)), *plen, fileid_len);
186 if (*plen < fileid_len) {
188 RETURN(FILEID_INVALID);
191 lfh->lfh_child = *ll_inode2fid(inode);
193 lfh->lfh_parent = *ll_inode2fid(parent);
195 fid_zero(&lfh->lfh_parent);
198 RETURN(FILEID_LUSTRE);
202 #ifndef HAVE_FILLDIR_USE_CTX
203 ll_nfs_get_name_filldir(void *cookie, const char *name, int namelen,
204 loff_t hash, u64 ino, unsigned type)
206 struct ll_getname_data *lgd = cookie;
208 ll_nfs_get_name_filldir(struct dir_context *ctx, const char *name, int namelen,
209 loff_t hash, u64 ino, unsigned type)
211 struct ll_getname_data *lgd =
212 container_of(ctx, struct ll_getname_data, ctx);
213 #endif /* HAVE_FILLDIR_USE_CTX */
215 * It is hack to access lde_fid for comparison with lgd_fid.
216 * So the input 'name' must be part of the 'lu_dirent', and
217 * so must appear to be a non-const pointer to an empty array.
219 char (*n)[0] = (void *)name;
220 /* NOTE: This should be container_of(). However container_of() in
221 * kernels earlier than v4.13-rc1~37^2~94 cause this to generate a
222 * warning, which fails when we compile with -Werror. Those earlier
223 * kernels don't have container_of_safe, calling that instead will use
224 * the lustre-local version which doesn't generate the warning.
226 struct lu_dirent *lde = container_of_safe(n, struct lu_dirent, lde_name);
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 = dentry->d_inode;
242 struct ll_getname_data lgd = {
244 .lgd_fid = ll_i2info(child->d_inode)->lli_fid,
245 #ifdef HAVE_DIR_CONTEXT
246 .ctx.actor = ll_nfs_get_name_filldir,
250 struct md_op_data *op_data;
256 if (!dir || !S_ISDIR(dir->i_mode))
257 GOTO(out, rc = -ENOTDIR);
260 GOTO(out, rc = -EINVAL);
262 op_data = ll_prep_md_op_data(NULL, dir, dir, NULL, 0, 0,
263 LUSTRE_OPC_ANY, dir);
265 GOTO(out, rc = PTR_ERR(op_data));
268 #ifdef HAVE_DIR_CONTEXT
269 rc = ll_dir_read(dir, &pos, op_data, &lgd.ctx, NULL);
271 rc = ll_dir_read(dir, &pos, op_data, &lgd, ll_nfs_get_name_filldir,
275 ll_finish_md_op_data(op_data);
276 if (!rc && !lgd.lgd_found)
283 static struct dentry *ll_fh_to_dentry(struct super_block *sb, struct fid *fid,
284 int fh_len, int fh_type)
286 struct lustre_file_handle *lfh = (struct lustre_file_handle *)fid;
288 if (fh_type != FILEID_LUSTRE)
289 RETURN(ERR_PTR(-EPROTO));
291 RETURN(ll_iget_for_nfs(sb, &lfh->lfh_child, &lfh->lfh_parent));
294 static struct dentry *ll_fh_to_parent(struct super_block *sb, struct fid *fid,
295 int fh_len, int fh_type)
297 struct lustre_file_handle *lfh = (struct lustre_file_handle *)fid;
299 if (fh_type != FILEID_LUSTRE)
300 RETURN(ERR_PTR(-EPROTO));
302 RETURN(ll_iget_for_nfs(sb, &lfh->lfh_parent, NULL));
305 int ll_dir_get_parent_fid(struct inode *dir, struct lu_fid *parent_fid)
307 struct ptlrpc_request *req = NULL;
308 struct ll_sb_info *sbi;
309 struct mdt_body *body;
310 static const char dotdot[] = "..";
311 struct md_op_data *op_data;
317 LASSERT(dir && S_ISDIR(dir->i_mode));
319 sbi = ll_s2sbi(dir->i_sb);
321 CDEBUG(D_INFO, "%s: getting parent for ("DFID")\n",
322 sbi->ll_fsname, PFID(ll_inode2fid(dir)));
324 rc = ll_get_default_mdsize(sbi, &lmmsize);
328 op_data = ll_prep_md_op_data(NULL, dir, NULL, dotdot,
329 strlen(dotdot), lmmsize,
330 LUSTRE_OPC_ANY, NULL);
332 RETURN(PTR_ERR(op_data));
334 rc = md_getattr_name(sbi->ll_md_exp, op_data, &req);
335 ll_finish_md_op_data(op_data);
337 CERROR("%s: failure inode "DFID" get parent: rc = %d\n",
338 sbi->ll_fsname, PFID(ll_inode2fid(dir)), rc);
341 body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY);
344 * LU-3952: MDT may lost the FID of its parent, we should not crash
345 * the NFS server, ll_iget_for_nfs() will handle the error.
347 if (body->mbo_valid & OBD_MD_FLID) {
348 CDEBUG(D_INFO, "parent for "DFID" is "DFID"\n",
349 PFID(ll_inode2fid(dir)), PFID(&body->mbo_fid1));
350 *parent_fid = body->mbo_fid1;
353 ptlrpc_req_finished(req);
357 static struct dentry *ll_get_parent(struct dentry *dchild)
359 struct lu_fid parent_fid = { 0 };
361 struct dentry *dentry;
365 rc = ll_dir_get_parent_fid(dchild->d_inode, &parent_fid);
369 dentry = ll_iget_for_nfs(dchild->d_inode->i_sb, &parent_fid, NULL);
374 const struct export_operations lustre_export_operations = {
375 .get_parent = ll_get_parent,
376 .encode_fh = ll_encode_fh,
377 .get_name = ll_get_name,
378 .fh_to_dentry = ll_fh_to_dentry,
379 .fh_to_parent = ll_fh_to_parent,