This source file includes following definitions.
- ceph_encode_snapfh
- ceph_encode_fh
- __lookup_inode
- ceph_lookup_inode
- __fh_to_dentry
- __snapfh_to_dentry
- ceph_fh_to_dentry
- __get_parent
- ceph_get_parent
- ceph_fh_to_parent
- __get_snap_name
- ceph_get_name
1
2 #include <linux/ceph/ceph_debug.h>
3
4 #include <linux/exportfs.h>
5 #include <linux/slab.h>
6 #include <asm/unaligned.h>
7
8 #include "super.h"
9 #include "mds_client.h"
10
11
12
13
14 struct ceph_nfs_fh {
15 u64 ino;
16 } __attribute__ ((packed));
17
18
19
20
21 struct ceph_nfs_confh {
22 u64 ino, parent_ino;
23 } __attribute__ ((packed));
24
25
26
27
28 struct ceph_nfs_snapfh {
29 u64 ino;
30 u64 snapid;
31 u64 parent_ino;
32 u32 hash;
33 } __attribute__ ((packed));
34
35 static int ceph_encode_snapfh(struct inode *inode, u32 *rawfh, int *max_len,
36 struct inode *parent_inode)
37 {
38 static const int snap_handle_length =
39 sizeof(struct ceph_nfs_snapfh) >> 2;
40 struct ceph_nfs_snapfh *sfh = (void *)rawfh;
41 u64 snapid = ceph_snap(inode);
42 int ret;
43 bool no_parent = true;
44
45 if (*max_len < snap_handle_length) {
46 *max_len = snap_handle_length;
47 ret = FILEID_INVALID;
48 goto out;
49 }
50
51 ret = -EINVAL;
52 if (snapid != CEPH_SNAPDIR) {
53 struct inode *dir;
54 struct dentry *dentry = d_find_alias(inode);
55 if (!dentry)
56 goto out;
57
58 rcu_read_lock();
59 dir = d_inode_rcu(dentry->d_parent);
60 if (ceph_snap(dir) != CEPH_SNAPDIR) {
61 sfh->parent_ino = ceph_ino(dir);
62 sfh->hash = ceph_dentry_hash(dir, dentry);
63 no_parent = false;
64 }
65 rcu_read_unlock();
66 dput(dentry);
67 }
68
69 if (no_parent) {
70 if (!S_ISDIR(inode->i_mode))
71 goto out;
72 sfh->parent_ino = sfh->ino;
73 sfh->hash = 0;
74 }
75 sfh->ino = ceph_ino(inode);
76 sfh->snapid = snapid;
77
78 *max_len = snap_handle_length;
79 ret = FILEID_BTRFS_WITH_PARENT;
80 out:
81 dout("encode_snapfh %llx.%llx ret=%d\n", ceph_vinop(inode), ret);
82 return ret;
83 }
84
85 static int ceph_encode_fh(struct inode *inode, u32 *rawfh, int *max_len,
86 struct inode *parent_inode)
87 {
88 static const int handle_length =
89 sizeof(struct ceph_nfs_fh) >> 2;
90 static const int connected_handle_length =
91 sizeof(struct ceph_nfs_confh) >> 2;
92 int type;
93
94 if (ceph_snap(inode) != CEPH_NOSNAP)
95 return ceph_encode_snapfh(inode, rawfh, max_len, parent_inode);
96
97 if (parent_inode && (*max_len < connected_handle_length)) {
98 *max_len = connected_handle_length;
99 return FILEID_INVALID;
100 } else if (*max_len < handle_length) {
101 *max_len = handle_length;
102 return FILEID_INVALID;
103 }
104
105 if (parent_inode) {
106 struct ceph_nfs_confh *cfh = (void *)rawfh;
107 dout("encode_fh %llx with parent %llx\n",
108 ceph_ino(inode), ceph_ino(parent_inode));
109 cfh->ino = ceph_ino(inode);
110 cfh->parent_ino = ceph_ino(parent_inode);
111 *max_len = connected_handle_length;
112 type = FILEID_INO32_GEN_PARENT;
113 } else {
114 struct ceph_nfs_fh *fh = (void *)rawfh;
115 dout("encode_fh %llx\n", ceph_ino(inode));
116 fh->ino = ceph_ino(inode);
117 *max_len = handle_length;
118 type = FILEID_INO32_GEN;
119 }
120 return type;
121 }
122
123 static struct inode *__lookup_inode(struct super_block *sb, u64 ino)
124 {
125 struct ceph_mds_client *mdsc = ceph_sb_to_client(sb)->mdsc;
126 struct inode *inode;
127 struct ceph_vino vino;
128 int err;
129
130 vino.ino = ino;
131 vino.snap = CEPH_NOSNAP;
132 inode = ceph_find_inode(sb, vino);
133 if (!inode) {
134 struct ceph_mds_request *req;
135 int mask;
136
137 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LOOKUPINO,
138 USE_ANY_MDS);
139 if (IS_ERR(req))
140 return ERR_CAST(req);
141
142 mask = CEPH_STAT_CAP_INODE;
143 if (ceph_security_xattr_wanted(d_inode(sb->s_root)))
144 mask |= CEPH_CAP_XATTR_SHARED;
145 req->r_args.lookupino.mask = cpu_to_le32(mask);
146
147 req->r_ino1 = vino;
148 req->r_num_caps = 1;
149 err = ceph_mdsc_do_request(mdsc, NULL, req);
150 inode = req->r_target_inode;
151 if (inode)
152 ihold(inode);
153 ceph_mdsc_put_request(req);
154 if (!inode)
155 return err < 0 ? ERR_PTR(err) : ERR_PTR(-ESTALE);
156 }
157 return inode;
158 }
159
160 struct inode *ceph_lookup_inode(struct super_block *sb, u64 ino)
161 {
162 struct inode *inode = __lookup_inode(sb, ino);
163 if (IS_ERR(inode))
164 return inode;
165 if (inode->i_nlink == 0) {
166 iput(inode);
167 return ERR_PTR(-ESTALE);
168 }
169 return inode;
170 }
171
172 static struct dentry *__fh_to_dentry(struct super_block *sb, u64 ino)
173 {
174 struct inode *inode = __lookup_inode(sb, ino);
175 if (IS_ERR(inode))
176 return ERR_CAST(inode);
177 if (inode->i_nlink == 0) {
178 iput(inode);
179 return ERR_PTR(-ESTALE);
180 }
181 return d_obtain_alias(inode);
182 }
183
184 static struct dentry *__snapfh_to_dentry(struct super_block *sb,
185 struct ceph_nfs_snapfh *sfh,
186 bool want_parent)
187 {
188 struct ceph_mds_client *mdsc = ceph_sb_to_client(sb)->mdsc;
189 struct ceph_mds_request *req;
190 struct inode *inode;
191 struct ceph_vino vino;
192 int mask;
193 int err;
194 bool unlinked = false;
195
196 if (want_parent) {
197 vino.ino = sfh->parent_ino;
198 if (sfh->snapid == CEPH_SNAPDIR)
199 vino.snap = CEPH_NOSNAP;
200 else if (sfh->ino == sfh->parent_ino)
201 vino.snap = CEPH_SNAPDIR;
202 else
203 vino.snap = sfh->snapid;
204 } else {
205 vino.ino = sfh->ino;
206 vino.snap = sfh->snapid;
207 }
208 inode = ceph_find_inode(sb, vino);
209 if (inode)
210 return d_obtain_alias(inode);
211
212 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LOOKUPINO,
213 USE_ANY_MDS);
214 if (IS_ERR(req))
215 return ERR_CAST(req);
216
217 mask = CEPH_STAT_CAP_INODE;
218 if (ceph_security_xattr_wanted(d_inode(sb->s_root)))
219 mask |= CEPH_CAP_XATTR_SHARED;
220 req->r_args.lookupino.mask = cpu_to_le32(mask);
221 if (vino.snap < CEPH_NOSNAP) {
222 req->r_args.lookupino.snapid = cpu_to_le64(vino.snap);
223 if (!want_parent && sfh->ino != sfh->parent_ino) {
224 req->r_args.lookupino.parent =
225 cpu_to_le64(sfh->parent_ino);
226 req->r_args.lookupino.hash =
227 cpu_to_le32(sfh->hash);
228 }
229 }
230
231 req->r_ino1 = vino;
232 req->r_num_caps = 1;
233 err = ceph_mdsc_do_request(mdsc, NULL, req);
234 inode = req->r_target_inode;
235 if (inode) {
236 if (vino.snap == CEPH_SNAPDIR) {
237 if (inode->i_nlink == 0)
238 unlinked = true;
239 inode = ceph_get_snapdir(inode);
240 } else if (ceph_snap(inode) == vino.snap) {
241 ihold(inode);
242 } else {
243
244 err = -EOPNOTSUPP;
245 inode = NULL;
246 }
247 }
248 ceph_mdsc_put_request(req);
249
250 if (want_parent) {
251 dout("snapfh_to_parent %llx.%llx\n err=%d\n",
252 vino.ino, vino.snap, err);
253 } else {
254 dout("snapfh_to_dentry %llx.%llx parent %llx hash %x err=%d",
255 vino.ino, vino.snap, sfh->parent_ino, sfh->hash, err);
256 }
257 if (!inode)
258 return ERR_PTR(-ESTALE);
259
260 return unlinked ? d_obtain_root(inode) : d_obtain_alias(inode);
261 }
262
263
264
265
266 static struct dentry *ceph_fh_to_dentry(struct super_block *sb,
267 struct fid *fid,
268 int fh_len, int fh_type)
269 {
270 struct ceph_nfs_fh *fh = (void *)fid->raw;
271
272 if (fh_type == FILEID_BTRFS_WITH_PARENT) {
273 struct ceph_nfs_snapfh *sfh = (void *)fid->raw;
274 return __snapfh_to_dentry(sb, sfh, false);
275 }
276
277 if (fh_type != FILEID_INO32_GEN &&
278 fh_type != FILEID_INO32_GEN_PARENT)
279 return NULL;
280 if (fh_len < sizeof(*fh) / 4)
281 return NULL;
282
283 dout("fh_to_dentry %llx\n", fh->ino);
284 return __fh_to_dentry(sb, fh->ino);
285 }
286
287 static struct dentry *__get_parent(struct super_block *sb,
288 struct dentry *child, u64 ino)
289 {
290 struct ceph_mds_client *mdsc = ceph_sb_to_client(sb)->mdsc;
291 struct ceph_mds_request *req;
292 struct inode *inode;
293 int mask;
294 int err;
295
296 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LOOKUPPARENT,
297 USE_ANY_MDS);
298 if (IS_ERR(req))
299 return ERR_CAST(req);
300
301 if (child) {
302 req->r_inode = d_inode(child);
303 ihold(d_inode(child));
304 } else {
305 req->r_ino1 = (struct ceph_vino) {
306 .ino = ino,
307 .snap = CEPH_NOSNAP,
308 };
309 }
310
311 mask = CEPH_STAT_CAP_INODE;
312 if (ceph_security_xattr_wanted(d_inode(sb->s_root)))
313 mask |= CEPH_CAP_XATTR_SHARED;
314 req->r_args.getattr.mask = cpu_to_le32(mask);
315
316 req->r_num_caps = 1;
317 err = ceph_mdsc_do_request(mdsc, NULL, req);
318 if (err) {
319 ceph_mdsc_put_request(req);
320 return ERR_PTR(err);
321 }
322
323 inode = req->r_target_inode;
324 if (inode)
325 ihold(inode);
326 ceph_mdsc_put_request(req);
327 if (!inode)
328 return ERR_PTR(-ENOENT);
329
330 return d_obtain_alias(inode);
331 }
332
333 static struct dentry *ceph_get_parent(struct dentry *child)
334 {
335 struct inode *inode = d_inode(child);
336 struct dentry *dn;
337
338 if (ceph_snap(inode) != CEPH_NOSNAP) {
339 struct inode* dir;
340 bool unlinked = false;
341
342 if (!d_is_dir(child)) {
343 dn = ERR_PTR(-EINVAL);
344 goto out;
345 }
346 dir = __lookup_inode(inode->i_sb, ceph_ino(inode));
347 if (IS_ERR(dir)) {
348 dn = ERR_CAST(dir);
349 goto out;
350 }
351
352
353 if (ceph_snap(inode) != CEPH_SNAPDIR) {
354 struct inode *snapdir = ceph_get_snapdir(dir);
355 if (dir->i_nlink == 0)
356 unlinked = true;
357 iput(dir);
358 if (IS_ERR(snapdir)) {
359 dn = ERR_CAST(snapdir);
360 goto out;
361 }
362 dir = snapdir;
363 }
364
365
366
367 if (unlinked)
368 dn = d_obtain_root(dir);
369 else
370 dn = d_obtain_alias(dir);
371 } else {
372 dn = __get_parent(child->d_sb, child, 0);
373 }
374 out:
375 dout("get_parent %p ino %llx.%llx err=%ld\n",
376 child, ceph_vinop(inode), (long)PTR_ERR_OR_ZERO(dn));
377 return dn;
378 }
379
380
381
382
383 static struct dentry *ceph_fh_to_parent(struct super_block *sb,
384 struct fid *fid,
385 int fh_len, int fh_type)
386 {
387 struct ceph_nfs_confh *cfh = (void *)fid->raw;
388 struct dentry *dentry;
389
390 if (fh_type == FILEID_BTRFS_WITH_PARENT) {
391 struct ceph_nfs_snapfh *sfh = (void *)fid->raw;
392 return __snapfh_to_dentry(sb, sfh, true);
393 }
394
395 if (fh_type != FILEID_INO32_GEN_PARENT)
396 return NULL;
397 if (fh_len < sizeof(*cfh) / 4)
398 return NULL;
399
400 dout("fh_to_parent %llx\n", cfh->parent_ino);
401 dentry = __get_parent(sb, NULL, cfh->ino);
402 if (unlikely(dentry == ERR_PTR(-ENOENT)))
403 dentry = __fh_to_dentry(sb, cfh->parent_ino);
404 return dentry;
405 }
406
407 static int __get_snap_name(struct dentry *parent, char *name,
408 struct dentry *child)
409 {
410 struct inode *inode = d_inode(child);
411 struct inode *dir = d_inode(parent);
412 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
413 struct ceph_mds_request *req = NULL;
414 char *last_name = NULL;
415 unsigned next_offset = 2;
416 int err = -EINVAL;
417
418 if (ceph_ino(inode) != ceph_ino(dir))
419 goto out;
420 if (ceph_snap(inode) == CEPH_SNAPDIR) {
421 if (ceph_snap(dir) == CEPH_NOSNAP) {
422 strcpy(name, fsc->mount_options->snapdir_name);
423 err = 0;
424 }
425 goto out;
426 }
427 if (ceph_snap(dir) != CEPH_SNAPDIR)
428 goto out;
429
430 while (1) {
431 struct ceph_mds_reply_info_parsed *rinfo;
432 struct ceph_mds_reply_dir_entry *rde;
433 int i;
434
435 req = ceph_mdsc_create_request(fsc->mdsc, CEPH_MDS_OP_LSSNAP,
436 USE_AUTH_MDS);
437 if (IS_ERR(req)) {
438 err = PTR_ERR(req);
439 req = NULL;
440 goto out;
441 }
442 err = ceph_alloc_readdir_reply_buffer(req, inode);
443 if (err)
444 goto out;
445
446 req->r_direct_mode = USE_AUTH_MDS;
447 req->r_readdir_offset = next_offset;
448 req->r_args.readdir.flags =
449 cpu_to_le16(CEPH_READDIR_REPLY_BITFLAGS);
450 if (last_name) {
451 req->r_path2 = last_name;
452 last_name = NULL;
453 }
454
455 req->r_inode = dir;
456 ihold(dir);
457 req->r_dentry = dget(parent);
458
459 inode_lock(dir);
460 err = ceph_mdsc_do_request(fsc->mdsc, NULL, req);
461 inode_unlock(dir);
462
463 if (err < 0)
464 goto out;
465
466 rinfo = &req->r_reply_info;
467 for (i = 0; i < rinfo->dir_nr; i++) {
468 rde = rinfo->dir_entries + i;
469 BUG_ON(!rde->inode.in);
470 if (ceph_snap(inode) ==
471 le64_to_cpu(rde->inode.in->snapid)) {
472 memcpy(name, rde->name, rde->name_len);
473 name[rde->name_len] = '\0';
474 err = 0;
475 goto out;
476 }
477 }
478
479 if (rinfo->dir_end)
480 break;
481
482 BUG_ON(rinfo->dir_nr <= 0);
483 rde = rinfo->dir_entries + (rinfo->dir_nr - 1);
484 next_offset += rinfo->dir_nr;
485 last_name = kstrndup(rde->name, rde->name_len, GFP_KERNEL);
486 if (!last_name) {
487 err = -ENOMEM;
488 goto out;
489 }
490
491 ceph_mdsc_put_request(req);
492 req = NULL;
493 }
494 err = -ENOENT;
495 out:
496 if (req)
497 ceph_mdsc_put_request(req);
498 kfree(last_name);
499 dout("get_snap_name %p ino %llx.%llx err=%d\n",
500 child, ceph_vinop(inode), err);
501 return err;
502 }
503
504 static int ceph_get_name(struct dentry *parent, char *name,
505 struct dentry *child)
506 {
507 struct ceph_mds_client *mdsc;
508 struct ceph_mds_request *req;
509 struct inode *inode = d_inode(child);
510 int err;
511
512 if (ceph_snap(inode) != CEPH_NOSNAP)
513 return __get_snap_name(parent, name, child);
514
515 mdsc = ceph_inode_to_client(inode)->mdsc;
516 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LOOKUPNAME,
517 USE_ANY_MDS);
518 if (IS_ERR(req))
519 return PTR_ERR(req);
520
521 inode_lock(d_inode(parent));
522
523 req->r_inode = inode;
524 ihold(inode);
525 req->r_ino2 = ceph_vino(d_inode(parent));
526 req->r_parent = d_inode(parent);
527 set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
528 req->r_num_caps = 2;
529 err = ceph_mdsc_do_request(mdsc, NULL, req);
530
531 inode_unlock(d_inode(parent));
532
533 if (!err) {
534 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
535 memcpy(name, rinfo->dname, rinfo->dname_len);
536 name[rinfo->dname_len] = 0;
537 dout("get_name %p ino %llx.%llx name %s\n",
538 child, ceph_vinop(inode), name);
539 } else {
540 dout("get_name %p ino %llx.%llx err %d\n",
541 child, ceph_vinop(inode), err);
542 }
543
544 ceph_mdsc_put_request(req);
545 return err;
546 }
547
548 const struct export_operations ceph_export_ops = {
549 .encode_fh = ceph_encode_fh,
550 .fh_to_dentry = ceph_fh_to_dentry,
551 .fh_to_parent = ceph_fh_to_parent,
552 .get_parent = ceph_get_parent,
553 .get_name = ceph_get_name,
554 };