1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
6 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 only,
10 * as published by the Free Software Foundation.
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License version 2 for more details (a copy is included
16 * in the LICENSE file that accompanied this code).
18 * You should have received a copy of the GNU General Public License
19 * version 2 along with this program; If not, see
20 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
22 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
23 * CA 95054 USA or visit www.sun.com if you need additional information or
29 * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
30 * Use is subject to license terms.
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 static int ll_nfs_test_inode(struct inode *inode, void *opaque)
65 return lu_fid_eq(&ll_i2info(inode)->lli_fid,
66 (struct lu_fid *)opaque);
69 static struct inode *search_inode_for_lustre(struct super_block *sb,
70 const struct lu_fid *fid)
72 struct ll_sb_info *sbi = ll_s2sbi(sb);
73 struct ptlrpc_request *req = NULL;
74 struct inode *inode = NULL;
76 unsigned long hash = (unsigned long) cl_fid_build_ino(fid, 0);
77 struct md_op_data *op_data;
81 CDEBUG(D_INFO, "searching inode for:(%lu,"DFID")\n", hash, PFID(fid));
83 inode = ilookup5(sb, hash, ll_nfs_test_inode, (void *)fid);
87 rc = ll_get_max_mdsize(sbi, &eadatalen);
91 /* Because inode is NULL, ll_prep_md_op_data can not
92 * be used here. So we allocate op_data ourselves */
93 OBD_ALLOC_PTR(op_data);
95 return ERR_PTR(-ENOMEM);
97 op_data->op_fid1 = *fid;
98 op_data->op_mode = eadatalen;
99 op_data->op_valid = OBD_MD_FLEASIZE;
101 /* mds_fid2dentry ignores f_type */
102 rc = md_getattr(sbi->ll_md_exp, op_data, &req);
103 OBD_FREE_PTR(op_data);
105 CERROR("can't get object attrs, fid "DFID", rc %d\n",
109 rc = ll_prep_inode(&inode, req, sb);
110 ptlrpc_req_finished(req);
117 static struct dentry *ll_iget_for_nfs(struct super_block *sb,
118 const struct lu_fid *fid)
121 struct dentry *result;
124 CDEBUG(D_INFO, "Get dentry for fid: "DFID"\n", PFID(fid));
125 if (!fid_is_sane(fid))
126 RETURN(ERR_PTR(-ESTALE));
128 inode = search_inode_for_lustre(sb, fid);
130 RETURN(ERR_PTR(PTR_ERR(inode)));
132 if (is_bad_inode(inode)) {
133 /* we didn't find the right inode.. */
134 CERROR("can't get inode by fid "DFID"\n",
137 RETURN(ERR_PTR(-ESTALE));
140 result = d_obtain_alias(inode);
142 RETURN(ERR_PTR(-ENOMEM));
144 ll_dops_init(result, 1, 0);
149 #define LUSTRE_NFS_FID 0x97
151 struct lustre_nfs_fid {
152 struct lu_fid lnf_child;
153 struct lu_fid lnf_parent;
157 * \a connectable - is nfsd will connect himself or this should be done
160 * The return value is file handle type:
161 * 1 -- contains child file handle;
162 * 2 -- contains child file handle and parent file handle;
165 static int ll_encode_fh(struct dentry *de, __u32 *fh, int *plen,
168 struct inode *inode = de->d_inode;
169 struct inode *parent = de->d_parent->d_inode;
170 struct lustre_nfs_fid *nfs_fid = (void *)fh;
173 CDEBUG(D_INFO, "encoding for (%lu,"DFID") maxlen=%d minlen=%d\n",
174 inode->i_ino, PFID(ll_inode2fid(inode)), *plen,
175 (int)sizeof(struct lustre_nfs_fid));
177 if (*plen < sizeof(struct lustre_nfs_fid)/4)
180 nfs_fid->lnf_child = *ll_inode2fid(inode);
181 nfs_fid->lnf_parent = *ll_inode2fid(parent);
182 *plen = sizeof(struct lustre_nfs_fid)/4;
184 RETURN(LUSTRE_NFS_FID);
187 static int ll_nfs_get_name_filldir(void *cookie, const char *name, int namelen,
188 loff_t hash, u64 ino, unsigned type)
190 /* It is hack to access lde_fid for comparison with lgd_fid.
191 * So the input 'name' must be part of the 'lu_dirent'. */
192 struct lu_dirent *lde = container_of0(name, struct lu_dirent, lde_name);
193 struct ll_getname_data *lgd = cookie;
196 fid_le_to_cpu(&fid, &lde->lde_fid);
197 if (lu_fid_eq(&fid, &lgd->lgd_fid)) {
198 memcpy(lgd->lgd_name, name, namelen);
199 lgd->lgd_name[namelen] = 0;
202 return lgd->lgd_found;
205 static int ll_get_name(struct dentry *dentry, char *name,
206 struct dentry *child)
208 struct inode *dir = dentry->d_inode;
210 struct ll_getname_data lgd;
214 if (!dir || !S_ISDIR(dir->i_mode))
215 GOTO(out, rc = -ENOTDIR);
218 GOTO(out, rc = -EINVAL);
220 filp = ll_dentry_open(dget(dentry), NULL, O_RDONLY, current_cred());
222 GOTO(out, rc = PTR_ERR(filp));
224 if (!filp->f_op->readdir)
225 GOTO(out_close, rc = -EINVAL);
228 lgd.lgd_fid = ll_i2info(child->d_inode)->lli_fid;
231 cfs_mutex_lock(&dir->i_mutex);
232 rc = ll_readdir(filp, &lgd, ll_nfs_get_name_filldir);
233 cfs_mutex_unlock(&dir->i_mutex);
234 if (!rc && !lgd.lgd_found)
244 #ifdef HAVE_FH_TO_DENTRY
245 static struct dentry *ll_fh_to_dentry(struct super_block *sb, struct fid *fid,
246 int fh_len, int fh_type)
248 struct lustre_nfs_fid *nfs_fid = (struct lustre_nfs_fid *)fid;
250 if (fh_type != LUSTRE_NFS_FID)
251 RETURN(ERR_PTR(-EPROTO));
253 RETURN(ll_iget_for_nfs(sb, &nfs_fid->lnf_child));
256 static struct dentry *ll_fh_to_parent(struct super_block *sb, struct fid *fid,
257 int fh_len, int fh_type)
259 struct lustre_nfs_fid *nfs_fid = (struct lustre_nfs_fid *)fid;
261 if (fh_type != LUSTRE_NFS_FID)
262 RETURN(ERR_PTR(-EPROTO));
264 RETURN(ll_iget_for_nfs(sb, &nfs_fid->lnf_parent));
270 * This length is counted as amount of __u32,
271 * It is composed of a fid and a mode
273 static struct dentry *ll_decode_fh(struct super_block *sb, __u32 *fh, int fh_len,
275 int (*acceptable)(void *, struct dentry *),
278 struct lustre_nfs_fid *nfs_fid = (void *)fh;
279 struct dentry *entry;
282 CDEBUG(D_INFO, "decoding for "DFID" fh_len=%d fh_type=%x\n",
283 PFID(&nfs_fid->lnf_child), fh_len, fh_type);
285 if (fh_type != LUSTRE_NFS_FID)
286 RETURN(ERR_PTR(-EPROTO));
288 entry = sb->s_export_op->find_exported_dentry(sb, &nfs_fid->lnf_child,
289 &nfs_fid->lnf_parent,
290 acceptable, context);
294 static struct dentry *ll_get_dentry(struct super_block *sb, void *data)
296 struct lustre_nfs_fid *fid = data;
297 struct dentry *entry;
300 entry = ll_iget_for_nfs(sb, &fid->lnf_child);
304 static struct dentry *ll_get_parent(struct dentry *dchild)
306 struct ptlrpc_request *req = NULL;
307 struct inode *dir = dchild->d_inode;
308 struct ll_sb_info *sbi;
309 struct dentry *result = NULL;
310 struct mdt_body *body;
311 static char dotdot[] = "..";
312 struct md_op_data *op_data;
316 LASSERT(dir && S_ISDIR(dir->i_mode));
318 sbi = ll_s2sbi(dir->i_sb);
320 CDEBUG(D_INFO, "getting parent for (%lu,"DFID")\n",
321 dir->i_ino, PFID(ll_inode2fid(dir)));
323 op_data = ll_prep_md_op_data(NULL, dir, NULL, dotdot,
325 LUSTRE_OPC_ANY, NULL);
327 RETURN(ERR_PTR(-ENOMEM));
329 rc = md_getattr_name(sbi->ll_md_exp, op_data, &req);
330 ll_finish_md_op_data(op_data);
332 CERROR("failure %d inode %lu get parent\n", rc, dir->i_ino);
335 body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY);
336 LASSERT(body->valid & OBD_MD_FLID);
338 CDEBUG(D_INFO, "parent for "DFID" is "DFID"\n",
339 PFID(ll_inode2fid(dir)), PFID(&body->fid1));
341 result = ll_iget_for_nfs(dir->i_sb, &body->fid1);
343 ptlrpc_req_finished(req);
347 struct export_operations lustre_export_operations = {
348 .get_parent = ll_get_parent,
349 .encode_fh = ll_encode_fh,
350 .get_name = ll_get_name,
351 #ifdef HAVE_FH_TO_DENTRY
352 .fh_to_dentry = ll_fh_to_dentry,
353 .fh_to_parent = ll_fh_to_parent,
355 .get_dentry = ll_get_dentry,
356 .decode_fh = ll_decode_fh,