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 struct lustre_nfs_fid {
116 struct lu_fid lnf_child;
117 struct lu_fid lnf_parent;
120 static struct dentry *
121 ll_iget_for_nfs(struct super_block *sb, struct lu_fid *fid, struct lu_fid *parent)
124 struct dentry *result;
128 if (!fid_is_sane(fid))
129 RETURN(ERR_PTR(-ESTALE));
131 CDEBUG(D_INFO, "Get dentry for fid: "DFID"\n", PFID(fid));
133 inode = search_inode_for_lustre(sb, fid);
135 RETURN(ERR_PTR(PTR_ERR(inode)));
137 if (is_bad_inode(inode)) {
138 /* we didn't find the right inode.. */
140 RETURN(ERR_PTR(-ESTALE));
143 /* N.B. d_obtain_alias() drops inode ref on error */
144 result = d_obtain_alias(inode);
145 if (!IS_ERR(result)) {
148 rc = ll_d_init(result);
151 result = ERR_PTR(rc);
153 struct ll_dentry_data *ldd = ll_d2d(result);
156 * Need to signal to the ll_file_open that
157 * we came from NFS and so opencache needs to be
158 * enabled for this one
160 spin_lock(&result->d_lock);
161 ldd->lld_nfs_dentry = 1;
162 spin_unlock(&result->d_lock);
169 #ifndef FILEID_INVALID
170 #define FILEID_INVALID 0xff
172 #ifndef FILEID_LUSTRE
173 #define FILEID_LUSTRE 0x97
177 * \a connectable - is nfsd will connect himself or this should be done
180 * The return value is file handle type:
181 * 1 -- contains child file handle;
182 * 2 -- contains child file handle and parent file handle;
185 #ifndef HAVE_ENCODE_FH_PARENT
186 static int ll_encode_fh(struct dentry *de, u32 *fh, int *plen,
189 struct inode *inode = de->d_inode;
190 struct inode *parent = de->d_parent->d_inode;
192 static int ll_encode_fh(struct inode *inode, u32 *fh, int *plen,
193 struct inode *parent)
196 int fileid_len = sizeof(struct lustre_nfs_fid) / 4;
197 struct lustre_nfs_fid *nfs_fid = (void *)fh;
201 CDEBUG(D_INFO, "%s: encoding for ("DFID") maxlen=%d minlen=%d\n",
202 ll_i2sbi(inode)->ll_fsname,
203 PFID(ll_inode2fid(inode)), *plen, fileid_len);
205 if (*plen < fileid_len) {
207 RETURN(FILEID_INVALID);
210 nfs_fid->lnf_child = *ll_inode2fid(inode);
212 nfs_fid->lnf_parent = *ll_inode2fid(parent);
214 fid_zero(&nfs_fid->lnf_parent);
217 RETURN(FILEID_LUSTRE);
221 #ifndef HAVE_FILLDIR_USE_CTX
222 ll_nfs_get_name_filldir(void *cookie, const char *name, int namelen,
223 loff_t hash, u64 ino, unsigned type)
225 struct ll_getname_data *lgd = cookie;
227 ll_nfs_get_name_filldir(struct dir_context *ctx, const char *name, int namelen,
228 loff_t hash, u64 ino, unsigned type)
230 struct ll_getname_data *lgd =
231 container_of(ctx, struct ll_getname_data, ctx);
232 #endif /* HAVE_FILLDIR_USE_CTX */
234 * It is hack to access lde_fid for comparison with lgd_fid.
235 * So the input 'name' must be part of the 'lu_dirent'.
237 struct lu_dirent *lde = container_of0(name, struct lu_dirent, lde_name);
240 fid_le_to_cpu(&fid, &lde->lde_fid);
241 if (lu_fid_eq(&fid, &lgd->lgd_fid)) {
242 memcpy(lgd->lgd_name, name, namelen);
243 lgd->lgd_name[namelen] = 0;
246 return lgd->lgd_found;
249 static int ll_get_name(struct dentry *dentry, char *name,
250 struct dentry *child)
252 struct inode *dir = dentry->d_inode;
253 struct ll_getname_data lgd = {
255 .lgd_fid = ll_i2info(child->d_inode)->lli_fid,
256 #ifdef HAVE_DIR_CONTEXT
257 .ctx.actor = ll_nfs_get_name_filldir,
261 struct md_op_data *op_data;
267 if (!dir || !S_ISDIR(dir->i_mode))
268 GOTO(out, rc = -ENOTDIR);
271 GOTO(out, rc = -EINVAL);
273 op_data = ll_prep_md_op_data(NULL, dir, dir, NULL, 0, 0,
274 LUSTRE_OPC_ANY, dir);
276 GOTO(out, rc = PTR_ERR(op_data));
279 #ifdef HAVE_DIR_CONTEXT
280 rc = ll_dir_read(dir, &pos, op_data, &lgd.ctx);
282 rc = ll_dir_read(dir, &pos, op_data, &lgd, ll_nfs_get_name_filldir);
285 ll_finish_md_op_data(op_data);
286 if (!rc && !lgd.lgd_found)
293 static struct dentry *ll_fh_to_dentry(struct super_block *sb, struct fid *fid,
294 int fh_len, int fh_type)
296 struct lustre_nfs_fid *nfs_fid = (struct lustre_nfs_fid *)fid;
298 if (fh_type != FILEID_LUSTRE)
299 RETURN(ERR_PTR(-EPROTO));
301 RETURN(ll_iget_for_nfs(sb, &nfs_fid->lnf_child, &nfs_fid->lnf_parent));
304 static struct dentry *ll_fh_to_parent(struct super_block *sb, struct fid *fid,
305 int fh_len, int fh_type)
307 struct lustre_nfs_fid *nfs_fid = (struct lustre_nfs_fid *)fid;
309 if (fh_type != FILEID_LUSTRE)
310 RETURN(ERR_PTR(-EPROTO));
312 RETURN(ll_iget_for_nfs(sb, &nfs_fid->lnf_parent, NULL));
315 int ll_dir_get_parent_fid(struct inode *dir, struct lu_fid *parent_fid)
317 struct ptlrpc_request *req = NULL;
318 struct ll_sb_info *sbi;
319 struct mdt_body *body;
320 static const char dotdot[] = "..";
321 struct md_op_data *op_data;
327 LASSERT(dir && S_ISDIR(dir->i_mode));
329 sbi = ll_s2sbi(dir->i_sb);
331 CDEBUG(D_INFO, "%s: getting parent for ("DFID")\n",
332 sbi->ll_fsname, PFID(ll_inode2fid(dir)));
334 rc = ll_get_default_mdsize(sbi, &lmmsize);
338 op_data = ll_prep_md_op_data(NULL, dir, NULL, dotdot,
339 strlen(dotdot), lmmsize,
340 LUSTRE_OPC_ANY, NULL);
342 RETURN(PTR_ERR(op_data));
344 rc = md_getattr_name(sbi->ll_md_exp, op_data, &req);
345 ll_finish_md_op_data(op_data);
347 CERROR("%s: failure inode "DFID" get parent: rc = %d\n",
348 sbi->ll_fsname, PFID(ll_inode2fid(dir)), rc);
351 body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY);
354 * LU-3952: MDT may lost the FID of its parent, we should not crash
355 * the NFS server, ll_iget_for_nfs() will handle the error.
357 if (body->mbo_valid & OBD_MD_FLID) {
358 CDEBUG(D_INFO, "parent for "DFID" is "DFID"\n",
359 PFID(ll_inode2fid(dir)), PFID(&body->mbo_fid1));
360 *parent_fid = body->mbo_fid1;
363 ptlrpc_req_finished(req);
367 static struct dentry *ll_get_parent(struct dentry *dchild)
369 struct lu_fid parent_fid = { 0 };
371 struct dentry *dentry;
375 rc = ll_dir_get_parent_fid(dchild->d_inode, &parent_fid);
379 dentry = ll_iget_for_nfs(dchild->d_inode->i_sb, &parent_fid, NULL);
384 struct export_operations lustre_export_operations = {
385 .get_parent = ll_get_parent,
386 .encode_fh = ll_encode_fh,
387 .get_name = ll_get_name,
388 .fh_to_dentry = ll_fh_to_dentry,
389 .fh_to_parent = ll_fh_to_parent,