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.sun.com/software/products/lustre/docs/GPLv2.pdf
20 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
21 * CA 95054 USA or visit www.sun.com if you need additional information or
27 * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
28 * Use is subject to license terms.
30 * Copyright (c) 2011, 2013, Intel Corporation.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
36 * lustre/lustre/llite/llite_nfs.c
38 * NFS export of Lustre Light File System
40 * Author: Yury Umanets <umka@clusterfs.com>
41 * Author: Huang Hua <huanghua@clusterfs.com>
44 #define DEBUG_SUBSYSTEM S_LLITE
45 #include <lustre_lite.h>
46 #include "llite_internal.h"
47 #include <linux/exportfs.h>
49 __u32 get_uuid2int(const char *name, int len)
51 __u32 key0 = 0x12a3fe2d, key1 = 0x37abe8f9;
53 __u32 key = key1 + (key0 ^ (*name++ * 7152373));
54 if (key & 0x80000000) key -= 0x7fffffff;
61 static int ll_nfs_test_inode(struct inode *inode, void *opaque)
63 return lu_fid_eq(&ll_i2info(inode)->lli_fid,
64 (struct lu_fid *)opaque);
67 struct inode *search_inode_for_lustre(struct super_block *sb,
68 const struct lu_fid *fid)
70 struct ll_sb_info *sbi = ll_s2sbi(sb);
71 struct ptlrpc_request *req = NULL;
72 struct inode *inode = NULL;
74 unsigned long hash = cl_fid_build_ino(fid,
75 ll_need_32bit_api(sbi));
76 struct md_op_data *op_data;
80 CDEBUG(D_INFO, "searching inode for:(%lu,"DFID")\n", hash, PFID(fid));
82 inode = ilookup5(sb, hash, ll_nfs_test_inode, (void *)fid);
86 rc = ll_get_max_mdsize(sbi, &eadatalen);
90 /* Because inode is NULL, ll_prep_md_op_data can not
91 * be used here. So we allocate op_data ourselves */
92 OBD_ALLOC_PTR(op_data);
94 return ERR_PTR(-ENOMEM);
96 op_data->op_fid1 = *fid;
97 op_data->op_mode = eadatalen;
98 op_data->op_valid = OBD_MD_FLEASIZE;
100 /* mds_fid2dentry ignores f_type */
101 rc = md_getattr(sbi->ll_md_exp, op_data, &req);
102 OBD_FREE_PTR(op_data);
104 /* Suppress erroneous/confusing messages when NFS
105 * is out of sync and requests old data. */
106 CDEBUG(D_INFO, "can't get object attrs, fid "DFID", rc %d\n",
110 rc = ll_prep_inode(&inode, req, sb, NULL);
111 ptlrpc_req_finished(req);
118 struct lustre_nfs_fid {
119 struct lu_fid lnf_child;
120 struct lu_fid lnf_parent;
123 static struct dentry *
124 ll_iget_for_nfs(struct super_block *sb, struct lu_fid *fid, struct lu_fid *parent)
127 struct dentry *result;
130 CDEBUG(D_INFO, "Get dentry for fid: "DFID"\n", PFID(fid));
131 if (!fid_is_sane(fid))
132 RETURN(ERR_PTR(-ESTALE));
134 inode = search_inode_for_lustre(sb, fid);
136 RETURN(ERR_PTR(PTR_ERR(inode)));
138 if (is_bad_inode(inode)) {
139 /* we didn't find the right inode.. */
141 RETURN(ERR_PTR(-ESTALE));
145 * It is an anonymous dentry without OST objects created yet.
146 * We have to find the parent to tell MDS how to init lov objects.
148 if (S_ISREG(inode->i_mode) && !ll_i2info(inode)->lli_has_smd &&
150 struct ll_inode_info *lli = ll_i2info(inode);
152 spin_lock(&lli->lli_lock);
153 lli->lli_pfid = *parent;
154 spin_unlock(&lli->lli_lock);
157 result = d_obtain_alias(inode);
158 if (IS_ERR(result)) {
166 #define LUSTRE_NFS_FID 0x97
169 * \a connectable - is nfsd will connect himself or this should be done
172 * The return value is file handle type:
173 * 1 -- contains child file handle;
174 * 2 -- contains child file handle and parent file handle;
177 #ifndef HAVE_ENCODE_FH_PARENT
178 static int ll_encode_fh(struct dentry *de, __u32 *fh, int *plen,
181 struct inode *inode = de->d_inode;
182 struct inode *parent = de->d_parent->d_inode;
184 static int ll_encode_fh(struct inode *inode, __u32 *fh, int *plen,
185 struct inode *parent)
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,
194 (int)sizeof(struct lustre_nfs_fid));
196 if (*plen < sizeof(struct lustre_nfs_fid) / 4)
199 nfs_fid->lnf_child = *ll_inode2fid(inode);
200 nfs_fid->lnf_parent = *ll_inode2fid(parent);
201 *plen = sizeof(struct lustre_nfs_fid) / 4;
203 RETURN(LUSTRE_NFS_FID);
206 static int ll_nfs_get_name_filldir(void *cookie, const char *name, int namelen,
207 loff_t hash, u64 ino, unsigned type)
209 /* It is hack to access lde_fid for comparison with lgd_fid.
210 * So the input 'name' must be part of the 'lu_dirent'. */
211 struct lu_dirent *lde = container_of0(name, struct lu_dirent, lde_name);
212 struct ll_getname_data *lgd = cookie;
215 fid_le_to_cpu(&fid, &lde->lde_fid);
216 if (lu_fid_eq(&fid, &lgd->lgd_fid)) {
217 memcpy(lgd->lgd_name, name, namelen);
218 lgd->lgd_name[namelen] = 0;
221 return lgd->lgd_found;
224 static int ll_get_name(struct dentry *dentry, char *name,
225 struct dentry *child)
227 struct inode *dir = dentry->d_inode;
228 struct ll_getname_data lgd;
233 if (!dir || !S_ISDIR(dir->i_mode))
234 GOTO(out, rc = -ENOTDIR);
237 GOTO(out, rc = -EINVAL);
240 lgd.lgd_fid = ll_i2info(child->d_inode)->lli_fid;
243 mutex_lock(&dir->i_mutex);
244 rc = ll_dir_read(dir, &offset, &lgd, ll_nfs_get_name_filldir);
245 mutex_unlock(&dir->i_mutex);
246 if (!rc && !lgd.lgd_found)
254 static struct dentry *ll_fh_to_dentry(struct super_block *sb, struct fid *fid,
255 int fh_len, int fh_type)
257 struct lustre_nfs_fid *nfs_fid = (struct lustre_nfs_fid *)fid;
259 if (fh_type != LUSTRE_NFS_FID)
260 RETURN(ERR_PTR(-EPROTO));
262 RETURN(ll_iget_for_nfs(sb, &nfs_fid->lnf_child, &nfs_fid->lnf_parent));
265 static struct dentry *ll_fh_to_parent(struct super_block *sb, struct fid *fid,
266 int fh_len, int fh_type)
268 struct lustre_nfs_fid *nfs_fid = (struct lustre_nfs_fid *)fid;
270 if (fh_type != LUSTRE_NFS_FID)
271 RETURN(ERR_PTR(-EPROTO));
273 RETURN(ll_iget_for_nfs(sb, &nfs_fid->lnf_parent, NULL));
275 static struct dentry *ll_get_parent(struct dentry *dchild)
277 struct ptlrpc_request *req = NULL;
278 struct inode *dir = dchild->d_inode;
279 struct ll_sb_info *sbi;
280 struct dentry *result = NULL;
281 struct mdt_body *body;
282 static char dotdot[] = "..";
283 struct md_op_data *op_data;
288 LASSERT(dir && S_ISDIR(dir->i_mode));
290 sbi = ll_s2sbi(dir->i_sb);
292 CDEBUG(D_INFO, "%s: getting parent for ("DFID")\n",
293 ll_get_fsname(dir->i_sb, NULL, 0),
294 PFID(ll_inode2fid(dir)));
296 rc = ll_get_max_mdsize(sbi, &lmmsize);
300 op_data = ll_prep_md_op_data(NULL, dir, NULL, dotdot,
301 strlen(dotdot), lmmsize,
302 LUSTRE_OPC_ANY, NULL);
304 RETURN((void *)op_data);
306 rc = md_getattr_name(sbi->ll_md_exp, op_data, &req);
307 ll_finish_md_op_data(op_data);
309 CERROR("%s: failure inode "DFID" get parent: rc = %d\n",
310 ll_get_fsname(dir->i_sb, NULL, 0),
311 PFID(ll_inode2fid(dir)), rc);
314 body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY);
315 LASSERT(body->valid & OBD_MD_FLID);
317 CDEBUG(D_INFO, "parent for "DFID" is "DFID"\n",
318 PFID(ll_inode2fid(dir)), PFID(&body->fid1));
320 result = ll_iget_for_nfs(dir->i_sb, &body->fid1, NULL);
322 ptlrpc_req_finished(req);
326 struct export_operations lustre_export_operations = {
327 .get_parent = ll_get_parent,
328 .encode_fh = ll_encode_fh,
329 .get_name = ll_get_name,
330 .fh_to_dentry = ll_fh_to_dentry,
331 .fh_to_parent = ll_fh_to_parent,