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 #ifdef HAVE_LINUX_EXPORTFS_H
48 #include <linux/exportfs.h>
51 __u32 get_uuid2int(const char *name, int len)
53 __u32 key0 = 0x12a3fe2d, key1 = 0x37abe8f9;
55 __u32 key = key1 + (key0 ^ (*name++ * 7152373));
56 if (key & 0x80000000) key -= 0x7fffffff;
63 void get_uuid2fsid(const char *name, int len, __kernel_fsid_t *fsid)
65 __u64 key = 0, key0 = 0x12a3fe2d, key1 = 0x37abe8f9;
68 key = key1 + (key0 ^ (*name++ * 7152373));
69 if (key & 0x8000000000000000ULL)
70 key -= 0x7fffffffffffffffULL;
76 fsid->val[1] = key >> 32;
79 static int ll_nfs_test_inode(struct inode *inode, void *opaque)
81 return lu_fid_eq(&ll_i2info(inode)->lli_fid,
82 (struct lu_fid *)opaque);
85 struct inode *search_inode_for_lustre(struct super_block *sb,
86 const struct lu_fid *fid)
88 struct ll_sb_info *sbi = ll_s2sbi(sb);
89 struct ptlrpc_request *req = NULL;
90 struct inode *inode = NULL;
92 unsigned long hash = cl_fid_build_ino(fid,
93 ll_need_32bit_api(sbi));
94 struct md_op_data *op_data;
98 CDEBUG(D_INFO, "searching inode for:(%lu,"DFID")\n", hash, PFID(fid));
100 inode = ilookup5(sb, hash, ll_nfs_test_inode, (void *)fid);
104 rc = ll_get_max_mdsize(sbi, &eadatalen);
108 /* Because inode is NULL, ll_prep_md_op_data can not
109 * be used here. So we allocate op_data ourselves */
110 OBD_ALLOC_PTR(op_data);
112 return ERR_PTR(-ENOMEM);
114 op_data->op_fid1 = *fid;
115 op_data->op_mode = eadatalen;
116 op_data->op_valid = OBD_MD_FLEASIZE;
118 /* mds_fid2dentry ignores f_type */
119 rc = md_getattr(sbi->ll_md_exp, op_data, &req);
120 OBD_FREE_PTR(op_data);
122 CERROR("can't get object attrs, fid "DFID", rc %d\n",
126 rc = ll_prep_inode(&inode, req, sb, NULL);
127 ptlrpc_req_finished(req);
134 struct lustre_nfs_fid {
135 struct lu_fid lnf_child;
136 struct lu_fid lnf_parent;
139 static struct dentry *
140 ll_iget_for_nfs(struct super_block *sb, struct lu_fid *fid, struct lu_fid *parent)
143 struct dentry *result;
146 CDEBUG(D_INFO, "Get dentry for fid: "DFID"\n", PFID(fid));
147 if (!fid_is_sane(fid))
148 RETURN(ERR_PTR(-ESTALE));
150 inode = search_inode_for_lustre(sb, fid);
152 RETURN(ERR_PTR(PTR_ERR(inode)));
154 if (is_bad_inode(inode)) {
155 /* we didn't find the right inode.. */
157 RETURN(ERR_PTR(-ESTALE));
161 * It is an anonymous dentry without OST objects created yet.
162 * We have to find the parent to tell MDS how to init lov objects.
164 if (S_ISREG(inode->i_mode) && !ll_i2info(inode)->lli_has_smd &&
166 struct ll_inode_info *lli = ll_i2info(inode);
168 spin_lock(&lli->lli_lock);
169 lli->lli_pfid = *parent;
170 spin_unlock(&lli->lli_lock);
173 result = d_obtain_alias(inode);
177 ll_dops_init(result, 1, 0);
182 #define LUSTRE_NFS_FID 0x97
185 * \a connectable - is nfsd will connect himself or this should be done
188 * The return value is file handle type:
189 * 1 -- contains child file handle;
190 * 2 -- contains child file handle and parent file handle;
193 #ifndef HAVE_ENCODE_FH_PARENT
194 static int ll_encode_fh(struct dentry *de, __u32 *fh, int *plen,
197 struct inode *inode = de->d_inode;
198 struct inode *parent = de->d_parent->d_inode;
200 static int ll_encode_fh(struct inode *inode, __u32 *fh, int *plen,
201 struct inode *parent)
204 struct lustre_nfs_fid *nfs_fid = (void *)fh;
207 CDEBUG(D_INFO, "encoding for (%lu,"DFID") maxlen=%d minlen=%d\n",
208 inode->i_ino, PFID(ll_inode2fid(inode)), *plen,
209 (int)sizeof(struct lustre_nfs_fid));
211 if (*plen < sizeof(struct lustre_nfs_fid) / 4)
214 nfs_fid->lnf_child = *ll_inode2fid(inode);
215 nfs_fid->lnf_parent = *ll_inode2fid(parent);
216 *plen = sizeof(struct lustre_nfs_fid) / 4;
218 RETURN(LUSTRE_NFS_FID);
221 static int ll_nfs_get_name_filldir(void *cookie, const char *name, int namelen,
222 loff_t hash, u64 ino, unsigned type)
224 /* It is hack to access lde_fid for comparison with lgd_fid.
225 * So the input 'name' must be part of the 'lu_dirent'. */
226 struct lu_dirent *lde = container_of0(name, struct lu_dirent, lde_name);
227 struct ll_getname_data *lgd = cookie;
230 fid_le_to_cpu(&fid, &lde->lde_fid);
231 if (lu_fid_eq(&fid, &lgd->lgd_fid)) {
232 memcpy(lgd->lgd_name, name, namelen);
233 lgd->lgd_name[namelen] = 0;
236 return lgd->lgd_found;
239 static int ll_get_name(struct dentry *dentry, char *name,
240 struct dentry *child)
242 struct inode *dir = dentry->d_inode;
243 struct ll_getname_data lgd;
248 if (!dir || !S_ISDIR(dir->i_mode))
249 GOTO(out, rc = -ENOTDIR);
252 GOTO(out, rc = -EINVAL);
255 lgd.lgd_fid = ll_i2info(child->d_inode)->lli_fid;
258 mutex_lock(&dir->i_mutex);
259 rc = ll_dir_read(dir, &offset, &lgd, ll_nfs_get_name_filldir);
260 mutex_unlock(&dir->i_mutex);
261 if (!rc && !lgd.lgd_found)
269 #ifdef HAVE_FH_TO_DENTRY
270 static struct dentry *ll_fh_to_dentry(struct super_block *sb, struct fid *fid,
271 int fh_len, int fh_type)
273 struct lustre_nfs_fid *nfs_fid = (struct lustre_nfs_fid *)fid;
275 if (fh_type != LUSTRE_NFS_FID)
276 RETURN(ERR_PTR(-EPROTO));
278 RETURN(ll_iget_for_nfs(sb, &nfs_fid->lnf_child, &nfs_fid->lnf_parent));
281 static struct dentry *ll_fh_to_parent(struct super_block *sb, struct fid *fid,
282 int fh_len, int fh_type)
284 struct lustre_nfs_fid *nfs_fid = (struct lustre_nfs_fid *)fid;
286 if (fh_type != LUSTRE_NFS_FID)
287 RETURN(ERR_PTR(-EPROTO));
289 RETURN(ll_iget_for_nfs(sb, &nfs_fid->lnf_parent, NULL));
295 * This length is counted as amount of __u32,
296 * It is composed of a fid and a mode
298 static struct dentry *ll_decode_fh(struct super_block *sb, __u32 *fh, int fh_len,
300 int (*acceptable)(void *, struct dentry *),
303 struct lustre_nfs_fid *nfs_fid = (void *)fh;
304 struct dentry *entry;
307 CDEBUG(D_INFO, "decoding for "DFID" fh_len=%d fh_type=%x\n",
308 PFID(&nfs_fid->lnf_child), fh_len, fh_type);
310 if (fh_type != LUSTRE_NFS_FID)
311 RETURN(ERR_PTR(-EPROTO));
313 entry = sb->s_export_op->find_exported_dentry(sb, &nfs_fid->lnf_child,
314 &nfs_fid->lnf_parent,
315 acceptable, context);
319 static struct dentry *ll_get_dentry(struct super_block *sb, void *data)
321 struct dentry *entry;
324 entry = ll_iget_for_nfs(sb, data, NULL);
328 static struct dentry *ll_get_parent(struct dentry *dchild)
330 struct ptlrpc_request *req = NULL;
331 struct inode *dir = dchild->d_inode;
332 struct ll_sb_info *sbi;
333 struct dentry *result = NULL;
334 struct mdt_body *body;
335 static char dotdot[] = "..";
336 struct md_op_data *op_data;
341 LASSERT(dir && S_ISDIR(dir->i_mode));
343 sbi = ll_s2sbi(dir->i_sb);
345 CDEBUG(D_INFO, "getting parent for (%lu,"DFID")\n",
346 dir->i_ino, PFID(ll_inode2fid(dir)));
348 rc = ll_get_max_mdsize(sbi, &lmmsize);
352 op_data = ll_prep_md_op_data(NULL, dir, NULL, dotdot,
353 strlen(dotdot), lmmsize,
354 LUSTRE_OPC_ANY, NULL);
356 RETURN((void *)op_data);
358 rc = md_getattr_name(sbi->ll_md_exp, op_data, &req);
359 ll_finish_md_op_data(op_data);
361 CERROR("failure %d inode %lu get parent\n", rc, dir->i_ino);
364 body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY);
365 LASSERT(body->valid & OBD_MD_FLID);
367 CDEBUG(D_INFO, "parent for "DFID" is "DFID"\n",
368 PFID(ll_inode2fid(dir)), PFID(&body->fid1));
370 result = ll_iget_for_nfs(dir->i_sb, &body->fid1, NULL);
372 ptlrpc_req_finished(req);
376 struct export_operations lustre_export_operations = {
377 .get_parent = ll_get_parent,
378 .encode_fh = ll_encode_fh,
379 .get_name = ll_get_name,
380 #ifdef HAVE_FH_TO_DENTRY
381 .fh_to_dentry = ll_fh_to_dentry,
382 .fh_to_parent = ll_fh_to_parent,
384 .get_dentry = ll_get_dentry,
385 .decode_fh = ll_decode_fh,