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40#define DEBUG_SUBSYSTEM S_LLITE
41#include "llite_internal.h"
42#include <linux/exportfs.h>
43
44__u32 get_uuid2int(const char *name, int len)
45{
46 __u32 key0 = 0x12a3fe2d, key1 = 0x37abe8f9;
47
48 while (len--) {
49 __u32 key = key1 + (key0 ^ (*name++ * 7152373));
50
51 if (key & 0x80000000)
52 key -= 0x7fffffff;
53 key1 = key0;
54 key0 = key;
55 }
56 return (key0 << 1);
57}
58
59void get_uuid2fsid(const char *name, int len, __kernel_fsid_t *fsid)
60{
61 __u64 key = 0, key0 = 0x12a3fe2d, key1 = 0x37abe8f9;
62
63 while (len--) {
64 key = key1 + (key0 ^ (*name++ * 7152373));
65 if (key & 0x8000000000000000ULL)
66 key -= 0x7fffffffffffffffULL;
67 key1 = key0;
68 key0 = key;
69 }
70
71 fsid->val[0] = key;
72 fsid->val[1] = key >> 32;
73}
74
75struct inode *search_inode_for_lustre(struct super_block *sb,
76 const struct lu_fid *fid)
77{
78 struct ll_sb_info *sbi = ll_s2sbi(sb);
79 struct ptlrpc_request *req = NULL;
80 struct inode *inode = NULL;
81 int eadatalen = 0;
82 unsigned long hash = cl_fid_build_ino(fid,
83 ll_need_32bit_api(sbi));
84 struct md_op_data *op_data;
85 int rc;
86
87 CDEBUG(D_INFO, "searching inode for:(%lu,"DFID")\n", hash, PFID(fid));
88
89 inode = ilookup5(sb, hash, ll_test_inode_by_fid, (void *)fid);
90 if (inode)
91 return inode;
92
93 rc = ll_get_default_mdsize(sbi, &eadatalen);
94 if (rc)
95 return ERR_PTR(rc);
96
97
98
99
100 op_data = kzalloc(sizeof(*op_data), GFP_NOFS);
101 if (!op_data)
102 return ERR_PTR(-ENOMEM);
103
104 op_data->op_fid1 = *fid;
105 op_data->op_mode = eadatalen;
106 op_data->op_valid = OBD_MD_FLEASIZE;
107
108
109 rc = md_getattr(sbi->ll_md_exp, op_data, &req);
110 kfree(op_data);
111 if (rc) {
112 CDEBUG(D_INFO, "can't get object attrs, fid "DFID", rc %d\n",
113 PFID(fid), rc);
114 return ERR_PTR(rc);
115 }
116 rc = ll_prep_inode(&inode, req, sb, NULL);
117 ptlrpc_req_finished(req);
118 if (rc)
119 return ERR_PTR(rc);
120
121 return inode;
122}
123
124struct lustre_nfs_fid {
125 struct lu_fid lnf_child;
126 struct lu_fid lnf_parent;
127};
128
129static struct dentry *
130ll_iget_for_nfs(struct super_block *sb, struct lu_fid *fid, struct lu_fid *parent)
131{
132 struct inode *inode;
133 struct dentry *result;
134
135 if (!fid_is_sane(fid))
136 return ERR_PTR(-ESTALE);
137
138 CDEBUG(D_INFO, "Get dentry for fid: " DFID "\n", PFID(fid));
139
140 inode = search_inode_for_lustre(sb, fid);
141 if (IS_ERR(inode))
142 return ERR_CAST(inode);
143
144 if (is_bad_inode(inode)) {
145
146 iput(inode);
147 return ERR_PTR(-ESTALE);
148 }
149
150 result = d_obtain_alias(inode);
151 if (IS_ERR(result)) {
152 iput(inode);
153 return result;
154 }
155
156
157
158
159
160
161 if (parent) {
162 struct ll_inode_info *lli = ll_i2info(inode);
163
164 spin_lock(&lli->lli_lock);
165 lli->lli_pfid = *parent;
166 spin_unlock(&lli->lli_lock);
167 }
168
169
170 result = d_obtain_alias(inode);
171 if (!IS_ERR(result)) {
172 int rc;
173
174 rc = ll_d_init(result);
175 if (rc < 0) {
176 dput(result);
177 result = ERR_PTR(rc);
178 } else {
179 struct ll_dentry_data *ldd = ll_d2d(result);
180
181
182
183
184
185
186 ldd->lld_nfs_dentry = 1;
187 }
188 }
189
190 return result;
191}
192
193
194
195
196
197
198
199
200
201
202static int ll_encode_fh(struct inode *inode, __u32 *fh, int *plen,
203 struct inode *parent)
204{
205 int fileid_len = sizeof(struct lustre_nfs_fid) / 4;
206 struct lustre_nfs_fid *nfs_fid = (void *)fh;
207
208 CDEBUG(D_INFO, "%s: encoding for ("DFID") maxlen=%d minlen=%d\n",
209 ll_get_fsname(inode->i_sb, NULL, 0),
210 PFID(ll_inode2fid(inode)), *plen, fileid_len);
211
212 if (*plen < fileid_len) {
213 *plen = fileid_len;
214 return FILEID_INVALID;
215 }
216
217 nfs_fid->lnf_child = *ll_inode2fid(inode);
218 if (parent)
219 nfs_fid->lnf_parent = *ll_inode2fid(parent);
220 else
221 fid_zero(&nfs_fid->lnf_parent);
222 *plen = fileid_len;
223
224 return FILEID_LUSTRE;
225}
226
227static int ll_nfs_get_name_filldir(struct dir_context *ctx, const char *name,
228 int namelen, loff_t hash, u64 ino,
229 unsigned type)
230{
231
232
233
234 struct lu_dirent *lde = container_of0(name, struct lu_dirent, lde_name);
235 struct ll_getname_data *lgd =
236 container_of(ctx, struct ll_getname_data, ctx);
237 struct lu_fid fid;
238
239 fid_le_to_cpu(&fid, &lde->lde_fid);
240 if (lu_fid_eq(&fid, &lgd->lgd_fid)) {
241 memcpy(lgd->lgd_name, name, namelen);
242 lgd->lgd_name[namelen] = 0;
243 lgd->lgd_found = 1;
244 }
245 return lgd->lgd_found;
246}
247
248static int ll_get_name(struct dentry *dentry, char *name,
249 struct dentry *child)
250{
251 struct inode *dir = d_inode(dentry);
252 int rc;
253 struct ll_getname_data lgd = {
254 .lgd_name = name,
255 .lgd_fid = ll_i2info(d_inode(child))->lli_fid,
256 .ctx.actor = ll_nfs_get_name_filldir,
257 };
258 struct md_op_data *op_data;
259 __u64 pos = 0;
260
261 if (!dir || !S_ISDIR(dir->i_mode)) {
262 rc = -ENOTDIR;
263 goto out;
264 }
265
266 if (!dir->i_fop) {
267 rc = -EINVAL;
268 goto out;
269 }
270
271 op_data = ll_prep_md_op_data(NULL, dir, dir, NULL, 0, 0,
272 LUSTRE_OPC_ANY, dir);
273 if (IS_ERR(op_data)) {
274 rc = PTR_ERR(op_data);
275 goto out;
276 }
277
278 op_data->op_max_pages = ll_i2sbi(dir)->ll_md_brw_pages;
279 inode_lock(dir);
280 rc = ll_dir_read(dir, &pos, op_data, &lgd.ctx);
281 inode_unlock(dir);
282 ll_finish_md_op_data(op_data);
283 if (!rc && !lgd.lgd_found)
284 rc = -ENOENT;
285out:
286 return rc;
287}
288
289static struct dentry *ll_fh_to_dentry(struct super_block *sb, struct fid *fid,
290 int fh_len, int fh_type)
291{
292 struct lustre_nfs_fid *nfs_fid = (struct lustre_nfs_fid *)fid;
293
294 if (fh_type != FILEID_LUSTRE)
295 return ERR_PTR(-EPROTO);
296
297 return ll_iget_for_nfs(sb, &nfs_fid->lnf_child, &nfs_fid->lnf_parent);
298}
299
300static struct dentry *ll_fh_to_parent(struct super_block *sb, struct fid *fid,
301 int fh_len, int fh_type)
302{
303 struct lustre_nfs_fid *nfs_fid = (struct lustre_nfs_fid *)fid;
304
305 if (fh_type != FILEID_LUSTRE)
306 return ERR_PTR(-EPROTO);
307
308 return ll_iget_for_nfs(sb, &nfs_fid->lnf_parent, NULL);
309}
310
311int ll_dir_get_parent_fid(struct inode *dir, struct lu_fid *parent_fid)
312{
313 struct ptlrpc_request *req = NULL;
314 struct ll_sb_info *sbi;
315 struct mdt_body *body;
316 static const char dotdot[] = "..";
317 struct md_op_data *op_data;
318 int rc;
319 int lmmsize;
320
321 LASSERT(dir && S_ISDIR(dir->i_mode));
322
323 sbi = ll_s2sbi(dir->i_sb);
324
325 CDEBUG(D_INFO, "%s: getting parent for ("DFID")\n",
326 ll_get_fsname(dir->i_sb, NULL, 0),
327 PFID(ll_inode2fid(dir)));
328
329 rc = ll_get_default_mdsize(sbi, &lmmsize);
330 if (rc != 0)
331 return rc;
332
333 op_data = ll_prep_md_op_data(NULL, dir, NULL, dotdot,
334 strlen(dotdot), lmmsize,
335 LUSTRE_OPC_ANY, NULL);
336 if (IS_ERR(op_data))
337 return PTR_ERR(op_data);
338
339 rc = md_getattr_name(sbi->ll_md_exp, op_data, &req);
340 ll_finish_md_op_data(op_data);
341 if (rc) {
342 CERROR("%s: failure inode "DFID" get parent: rc = %d\n",
343 ll_get_fsname(dir->i_sb, NULL, 0),
344 PFID(ll_inode2fid(dir)), rc);
345 return rc;
346 }
347 body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY);
348
349
350
351
352 if (body->mbo_valid & OBD_MD_FLID) {
353 CDEBUG(D_INFO, "parent for " DFID " is " DFID "\n",
354 PFID(ll_inode2fid(dir)), PFID(&body->mbo_fid1));
355 *parent_fid = body->mbo_fid1;
356 }
357
358 ptlrpc_req_finished(req);
359 return 0;
360}
361
362static struct dentry *ll_get_parent(struct dentry *dchild)
363{
364 struct lu_fid parent_fid = { 0 };
365 struct dentry *dentry;
366 int rc;
367
368 rc = ll_dir_get_parent_fid(dchild->d_inode, &parent_fid);
369 if (rc)
370 return ERR_PTR(rc);
371
372 dentry = ll_iget_for_nfs(dchild->d_inode->i_sb, &parent_fid, NULL);
373
374 return dentry;
375}
376
377const struct export_operations lustre_export_operations = {
378 .get_parent = ll_get_parent,
379 .encode_fh = ll_encode_fh,
380 .get_name = ll_get_name,
381 .fh_to_dentry = ll_fh_to_dentry,
382 .fh_to_parent = ll_fh_to_parent,
383};
384