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/
31 * lustre/lustre/llite/llite_nfs.c
33 * NFS export of Lustre Light File System
35 * Author: Yury Umanets <umka@clusterfs.com>
36 * Author: Huang Hua <huanghua@clusterfs.com>
39 #define DEBUG_SUBSYSTEM S_LLITE
40 #include "llite_internal.h"
41 #include <linux/exportfs.h>
43 u32 get_uuid2int(const char *name, int len)
45 u32 key0 = 0x12a3fe2d, key1 = 0x37abe8f9;
48 u32 key = key1 + (key0 ^ (*name++ * 7152373));
59 struct inode *search_inode_for_lustre(struct super_block *sb,
60 const struct lu_fid *fid)
62 struct ll_sb_info *sbi = ll_s2sbi(sb);
63 struct ptlrpc_request *req = NULL;
64 struct inode *inode = NULL;
66 unsigned long hash = cl_fid_build_ino(fid, ll_need_32bit_api(sbi));
67 struct md_op_data *op_data;
72 CDEBUG(D_INFO, "searching inode for:(%lu,"DFID")\n", hash, PFID(fid));
74 inode = ilookup5(sb, hash, ll_test_inode_by_fid, (void *)fid);
78 rc = ll_get_default_mdsize(sbi, &eadatalen);
83 * Because inode is NULL, ll_prep_md_op_data can not
84 * be used here. So we allocate op_data ourselves
86 OBD_ALLOC_PTR(op_data);
88 return ERR_PTR(-ENOMEM);
90 op_data->op_fid1 = *fid;
91 op_data->op_mode = eadatalen;
92 op_data->op_valid = OBD_MD_FLEASIZE;
94 /* mds_fid2dentry ignores f_type */
95 rc = md_getattr(sbi->ll_md_exp, op_data, &req);
96 OBD_FREE_PTR(op_data);
99 * Suppress erroneous/confusing messages when NFS
100 * is out of sync and requests old data.
102 CDEBUG(D_INFO, "can't get object attrs, fid "DFID", rc %d\n",
106 rc = ll_prep_inode(&inode, &req->rq_pill, sb, NULL);
107 ptlrpc_req_finished(req);
114 static struct dentry *
115 ll_iget_for_nfs(struct super_block *sb, struct lu_fid *fid, struct lu_fid *parent)
118 struct dentry *result;
122 if (!fid_is_sane(fid))
123 RETURN(ERR_PTR(-ESTALE));
125 CDEBUG(D_INFO, "Get dentry for fid: "DFID"\n", PFID(fid));
127 inode = search_inode_for_lustre(sb, fid);
129 RETURN(ERR_CAST(inode));
131 if (is_bad_inode(inode)) {
132 /* we didn't find the right inode.. */
134 RETURN(ERR_PTR(-ESTALE));
137 /* N.B. d_obtain_alias() drops inode ref on error */
138 result = d_obtain_alias(inode);
142 if (!ll_d_setup(result, true))
143 RETURN(ERR_PTR(-ENOMEM));
145 #if LINUX_VERSION_CODE < KERNEL_VERSION(5, 5, 0)
146 /* If we are called by nfsd kthread set lli_open_thrsh_count
147 * to one. This will force caching the open lock. To be
148 * removed once oldest supported Linux kernel is 5.5
150 if ((current->flags & PF_KTHREAD) &&
151 strcmp(current->comm, "nfsd") == 0) {
152 struct ll_inode_info *lli = ll_i2info(inode);
154 lli->lli_open_thrsh_count = 1;
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 static int ll_encode_fh(struct inode *inode, u32 *fh, int *plen,
177 struct inode *parent)
179 int fileid_len = sizeof(struct lustre_file_handle) / 4;
180 struct lustre_file_handle *lfh = (void *)fh;
184 CDEBUG(D_INFO, "%s: encoding for ("DFID") maxlen=%d minlen=%d\n",
185 ll_i2sbi(inode)->ll_fsname,
186 PFID(ll_inode2fid(inode)), *plen, fileid_len);
188 if (*plen < fileid_len) {
190 RETURN(FILEID_INVALID);
193 lfh->lfh_child = *ll_inode2fid(inode);
195 lfh->lfh_parent = *ll_inode2fid(parent);
197 fid_zero(&lfh->lfh_parent);
200 RETURN(FILEID_LUSTRE);
204 do_nfs_get_name_filldir(struct ll_getname_data *lgd, const char *name,
205 int namelen, loff_t hash, u64 ino, unsigned int type)
208 * It is hack to access lde_fid for comparison with lgd_fid.
209 * So the input 'name' must be part of the 'lu_dirent', and
210 * so must appear to be a non-const pointer to an empty array.
212 char (*n)[0] = (void *)name;
213 /* NOTE: This should be container_of(). However container_of() in
214 * kernels earlier than v4.13-rc1~37^2~94 cause this to generate a
215 * warning, which fails when we compile with -Werror. Those earlier
216 * kernels don't have container_of_safe, calling that instead will use
217 * the lustre-local version which doesn't generate the warning.
219 struct lu_dirent *lde = container_of_safe(n, struct lu_dirent, lde_name);
222 fid_le_to_cpu(&fid, &lde->lde_fid);
223 if (lu_fid_eq(&fid, &lgd->lgd_fid)) {
224 memcpy(lgd->lgd_name, name, namelen);
225 lgd->lgd_name[namelen] = 0;
228 return lgd->lgd_found;
231 #ifdef HAVE_FILLDIR_USE_CTX_RETURN_BOOL
233 ll_nfs_get_name_filldir(struct dir_context *ctx, const char *name, int namelen,
234 loff_t hash, u64 ino, unsigned int type)
236 struct ll_getname_data *lgd =
237 container_of(ctx, struct ll_getname_data, ctx);
238 int err = do_nfs_get_name_filldir(lgd, name, namelen, hash, ino, type);
242 #elif defined(HAVE_FILLDIR_USE_CTX)
244 ll_nfs_get_name_filldir(struct dir_context *ctx, const char *name, int namelen,
245 loff_t hash, u64 ino, unsigned int type)
247 struct ll_getname_data *lgd =
248 container_of(ctx, struct ll_getname_data, ctx);
250 return do_nfs_get_name_filldir(lgd, name, namelen, hash, ino, type);
253 static int ll_nfs_get_name_filldir(void *cookie, const char *name, int namelen,
254 loff_t hash, u64 ino, unsigned int type)
256 struct ll_getname_data *lgd = cookie;
258 return do_nfs_get_name_filldir(lgd, name, namelen, hash, ino, type);
260 #endif /* HAVE_FILLDIR_USE_CTX */
262 static int ll_get_name(struct dentry *dentry, char *name, struct dentry *child)
264 struct inode *dir = dentry->d_inode;
265 struct ll_getname_data lgd = {
267 .lgd_fid = ll_i2info(child->d_inode)->lli_fid,
268 #ifdef HAVE_DIR_CONTEXT
269 .ctx.actor = (filldir_t)ll_nfs_get_name_filldir,
273 struct md_op_data *op_data;
279 if (!dir || !S_ISDIR(dir->i_mode))
280 GOTO(out, rc = -ENOTDIR);
283 GOTO(out, rc = -EINVAL);
285 op_data = ll_prep_md_op_data(NULL, dir, dir, NULL, 0, 0,
286 LUSTRE_OPC_ANY, dir);
288 GOTO(out, rc = PTR_ERR(op_data));
291 #ifdef HAVE_DIR_CONTEXT
292 rc = ll_dir_read(dir, &pos, op_data, &lgd.ctx, NULL);
294 rc = ll_dir_read(dir, &pos, op_data, &lgd, ll_nfs_get_name_filldir,
297 ll_inode_unlock(dir);
298 ll_finish_md_op_data(op_data);
299 if (!rc && !lgd.lgd_found)
306 static struct dentry *ll_fh_to_dentry(struct super_block *sb, struct fid *fid,
307 int fh_len, int fh_type)
309 struct lustre_file_handle *lfh = (struct lustre_file_handle *)fid;
311 if (fh_type != FILEID_LUSTRE)
312 RETURN(ERR_PTR(-EPROTO));
314 RETURN(ll_iget_for_nfs(sb, &lfh->lfh_child, &lfh->lfh_parent));
317 static struct dentry *ll_fh_to_parent(struct super_block *sb, struct fid *fid,
318 int fh_len, int fh_type)
320 struct lustre_file_handle *lfh = (struct lustre_file_handle *)fid;
322 if (fh_type != FILEID_LUSTRE)
323 RETURN(ERR_PTR(-EPROTO));
325 RETURN(ll_iget_for_nfs(sb, &lfh->lfh_parent, NULL));
328 int ll_dir_get_parent_fid(struct inode *dir, struct lu_fid *parent_fid)
330 struct ptlrpc_request *req = NULL;
331 struct ll_sb_info *sbi;
332 struct mdt_body *body;
333 static const char dotdot[] = "..";
334 struct md_op_data *op_data;
340 LASSERT(dir && S_ISDIR(dir->i_mode));
342 sbi = ll_s2sbi(dir->i_sb);
344 CDEBUG(D_INFO, "%s: getting parent for ("DFID")\n",
345 sbi->ll_fsname, PFID(ll_inode2fid(dir)));
347 rc = ll_get_default_mdsize(sbi, &lmmsize);
351 op_data = ll_prep_md_op_data(NULL, dir, NULL, dotdot,
352 strlen(dotdot), lmmsize,
353 LUSTRE_OPC_ANY, NULL);
355 RETURN(PTR_ERR(op_data));
357 rc = md_getattr_name(sbi->ll_md_exp, op_data, &req);
358 ll_finish_md_op_data(op_data);
360 CERROR("%s: failure inode "DFID" get parent: rc = %d\n",
361 sbi->ll_fsname, PFID(ll_inode2fid(dir)), rc);
364 body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY);
367 * LU-3952: MDT may lost the FID of its parent, we should not crash
368 * the NFS server, ll_iget_for_nfs() will handle the error.
370 if (body->mbo_valid & OBD_MD_FLID) {
371 CDEBUG(D_INFO, "parent for "DFID" is "DFID"\n",
372 PFID(ll_inode2fid(dir)), PFID(&body->mbo_fid1));
373 *parent_fid = body->mbo_fid1;
376 ptlrpc_req_finished(req);
380 static struct dentry *ll_get_parent(struct dentry *dchild)
382 struct lu_fid parent_fid = { 0 };
384 struct dentry *dentry;
388 rc = ll_dir_get_parent_fid(dchild->d_inode, &parent_fid);
392 dentry = ll_iget_for_nfs(dchild->d_inode->i_sb, &parent_fid, NULL);
397 const struct export_operations lustre_export_operations = {
398 .get_parent = ll_get_parent,
399 .encode_fh = ll_encode_fh,
400 .get_name = ll_get_name,
401 .fh_to_dentry = ll_fh_to_dentry,
402 .fh_to_parent = ll_fh_to_parent,