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, 2016, 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;
48 __u32 key = key1 + (key0 ^ (*name++ * 7152373));
49 if (key & 0x80000000) key -= 0x7fffffff;
56 struct inode *search_inode_for_lustre(struct super_block *sb,
57 const struct lu_fid *fid)
59 struct ll_sb_info *sbi = ll_s2sbi(sb);
60 struct ptlrpc_request *req = NULL;
61 struct inode *inode = NULL;
63 unsigned long hash = cl_fid_build_ino(fid,
64 ll_need_32bit_api(sbi));
65 struct md_op_data *op_data;
69 CDEBUG(D_INFO, "searching inode for:(%lu,"DFID")\n", hash, PFID(fid));
71 inode = ilookup5(sb, hash, ll_test_inode_by_fid, (void *)fid);
75 rc = ll_get_default_mdsize(sbi, &eadatalen);
79 /* Because inode is NULL, ll_prep_md_op_data can not
80 * be used here. So we allocate op_data ourselves */
81 OBD_ALLOC_PTR(op_data);
83 return ERR_PTR(-ENOMEM);
85 op_data->op_fid1 = *fid;
86 op_data->op_mode = eadatalen;
87 op_data->op_valid = OBD_MD_FLEASIZE;
89 /* mds_fid2dentry ignores f_type */
90 rc = md_getattr(sbi->ll_md_exp, op_data, &req);
91 OBD_FREE_PTR(op_data);
93 /* Suppress erroneous/confusing messages when NFS
94 * is out of sync and requests old data. */
95 CDEBUG(D_INFO, "can't get object attrs, fid "DFID", rc %d\n",
99 rc = ll_prep_inode(&inode, req, sb, NULL);
100 ptlrpc_req_finished(req);
107 struct lustre_nfs_fid {
108 struct lu_fid lnf_child;
109 struct lu_fid lnf_parent;
112 static struct dentry *
113 ll_iget_for_nfs(struct super_block *sb, struct lu_fid *fid, struct lu_fid *parent)
116 struct dentry *result;
119 if (!fid_is_sane(fid))
120 RETURN(ERR_PTR(-ESTALE));
122 CDEBUG(D_INFO, "Get dentry for fid: "DFID"\n", PFID(fid));
124 inode = search_inode_for_lustre(sb, fid);
126 RETURN(ERR_PTR(PTR_ERR(inode)));
128 if (is_bad_inode(inode)) {
129 /* we didn't find the right inode.. */
131 RETURN(ERR_PTR(-ESTALE));
134 /* N.B. d_obtain_alias() drops inode ref on error */
135 result = d_obtain_alias(inode);
136 if (!IS_ERR(result)) {
139 rc = ll_d_init(result);
142 result = ERR_PTR(rc);
144 struct ll_dentry_data *ldd = ll_d2d(result);
147 * Need to signal to the ll_file_open that
148 * we came from NFS and so opencache needs to be
149 * enabled for this one
151 spin_lock(&result->d_lock);
152 ldd->lld_nfs_dentry = 1;
153 spin_unlock(&result->d_lock);
160 #ifndef FILEID_INVALID
161 #define FILEID_INVALID 0xff
163 #ifndef FILEID_LUSTRE
164 #define FILEID_LUSTRE 0x97
168 * \a connectable - is nfsd will connect himself or this should be done
171 * The return value is file handle type:
172 * 1 -- contains child file handle;
173 * 2 -- contains child file handle and parent file handle;
176 #ifndef HAVE_ENCODE_FH_PARENT
177 static int ll_encode_fh(struct dentry *de, __u32 *fh, int *plen,
180 struct inode *inode = de->d_inode;
181 struct inode *parent = de->d_parent->d_inode;
183 static int ll_encode_fh(struct inode *inode, __u32 *fh, int *plen,
184 struct inode *parent)
187 int fileid_len = sizeof(struct lustre_nfs_fid) / 4;
188 struct lustre_nfs_fid *nfs_fid = (void *)fh;
191 CDEBUG(D_INFO, "%s: encoding for ("DFID") maxlen=%d minlen=%d\n",
192 ll_get_fsname(inode->i_sb, NULL, 0),
193 PFID(ll_inode2fid(inode)), *plen, fileid_len);
195 if (*plen < fileid_len) {
197 RETURN(FILEID_INVALID);
200 nfs_fid->lnf_child = *ll_inode2fid(inode);
202 nfs_fid->lnf_parent = *ll_inode2fid(parent);
204 fid_zero(&nfs_fid->lnf_parent);
207 RETURN(FILEID_LUSTRE);
211 #ifndef HAVE_FILLDIR_USE_CTX
212 ll_nfs_get_name_filldir(void *cookie, const char *name, int namelen,
213 loff_t hash, u64 ino, unsigned type)
215 struct ll_getname_data *lgd = cookie;
217 ll_nfs_get_name_filldir(struct dir_context *ctx, const char *name, int namelen,
218 loff_t hash, u64 ino, unsigned type)
220 struct ll_getname_data *lgd =
221 container_of(ctx, struct ll_getname_data, ctx);
222 #endif /* HAVE_FILLDIR_USE_CTX */
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'. */
225 struct lu_dirent *lde = container_of0(name, struct lu_dirent, lde_name);
228 fid_le_to_cpu(&fid, &lde->lde_fid);
229 if (lu_fid_eq(&fid, &lgd->lgd_fid)) {
230 memcpy(lgd->lgd_name, name, namelen);
231 lgd->lgd_name[namelen] = 0;
234 return lgd->lgd_found;
237 static int ll_get_name(struct dentry *dentry, char *name,
238 struct dentry *child)
240 struct inode *dir = dentry->d_inode;
241 struct ll_getname_data lgd = {
243 .lgd_fid = ll_i2info(child->d_inode)->lli_fid,
244 #ifdef HAVE_DIR_CONTEXT
245 .ctx.actor = ll_nfs_get_name_filldir,
249 struct md_op_data *op_data;
254 if (!dir || !S_ISDIR(dir->i_mode))
255 GOTO(out, rc = -ENOTDIR);
258 GOTO(out, rc = -EINVAL);
260 op_data = ll_prep_md_op_data(NULL, dir, dir, NULL, 0, 0,
261 LUSTRE_OPC_ANY, dir);
263 GOTO(out, rc = PTR_ERR(op_data));
266 #ifdef HAVE_DIR_CONTEXT
267 rc = ll_dir_read(dir, &pos, op_data, &lgd.ctx);
269 rc = ll_dir_read(dir, &pos, op_data, &lgd, ll_nfs_get_name_filldir);
272 ll_finish_md_op_data(op_data);
273 if (!rc && !lgd.lgd_found)
280 static struct dentry *ll_fh_to_dentry(struct super_block *sb, struct fid *fid,
281 int fh_len, int fh_type)
283 struct lustre_nfs_fid *nfs_fid = (struct lustre_nfs_fid *)fid;
285 if (fh_type != FILEID_LUSTRE)
286 RETURN(ERR_PTR(-EPROTO));
288 RETURN(ll_iget_for_nfs(sb, &nfs_fid->lnf_child, &nfs_fid->lnf_parent));
291 static struct dentry *ll_fh_to_parent(struct super_block *sb, struct fid *fid,
292 int fh_len, int fh_type)
294 struct lustre_nfs_fid *nfs_fid = (struct lustre_nfs_fid *)fid;
296 if (fh_type != FILEID_LUSTRE)
297 RETURN(ERR_PTR(-EPROTO));
299 RETURN(ll_iget_for_nfs(sb, &nfs_fid->lnf_parent, NULL));
302 int ll_dir_get_parent_fid(struct inode *dir, struct lu_fid *parent_fid)
304 struct ptlrpc_request *req = NULL;
305 struct ll_sb_info *sbi;
306 struct mdt_body *body;
307 static const char dotdot[] = "..";
308 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);
342 * LU-3952: MDT may lost the FID of its parent, we should not crash
343 * the NFS server, ll_iget_for_nfs() will handle the error.
345 if (body->mbo_valid & OBD_MD_FLID) {
346 CDEBUG(D_INFO, "parent for "DFID" is "DFID"\n",
347 PFID(ll_inode2fid(dir)), PFID(&body->mbo_fid1));
348 *parent_fid = body->mbo_fid1;
351 ptlrpc_req_finished(req);
355 static struct dentry *ll_get_parent(struct dentry *dchild)
357 struct lu_fid parent_fid = { 0 };
359 struct dentry *dentry;
362 rc = ll_dir_get_parent_fid(dchild->d_inode, &parent_fid);
366 dentry = ll_iget_for_nfs(dchild->d_inode->i_sb, &parent_fid, NULL);
371 struct export_operations lustre_export_operations = {
372 .get_parent = ll_get_parent,
373 .encode_fh = ll_encode_fh,
374 .get_name = ll_get_name,
375 .fh_to_dentry = ll_fh_to_dentry,
376 .fh_to_parent = ll_fh_to_parent,