Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
3d14c5d2 | 2 | #include <linux/ceph/ceph_debug.h> |
a8e63b7d SW |
3 | |
4 | #include <linux/exportfs.h> | |
5a0e3ad6 | 5 | #include <linux/slab.h> |
a8e63b7d SW |
6 | #include <asm/unaligned.h> |
7 | ||
8 | #include "super.h" | |
3d14c5d2 | 9 | #include "mds_client.h" |
a8e63b7d | 10 | |
a8e63b7d SW |
11 | /* |
12 | * Basic fh | |
13 | */ | |
14 | struct ceph_nfs_fh { | |
15 | u64 ino; | |
16 | } __attribute__ ((packed)); | |
17 | ||
18 | /* | |
4f32b42d | 19 | * Larger fh that includes parent ino. |
a8e63b7d SW |
20 | */ |
21 | struct ceph_nfs_confh { | |
22 | u64 ino, parent_ino; | |
a8e63b7d SW |
23 | } __attribute__ ((packed)); |
24 | ||
570df4e9 YZ |
25 | /* |
26 | * fh for snapped inode | |
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 | { | |
536cc331 | 38 | static const int snap_handle_length = |
570df4e9 YZ |
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 | ||
c862868b SW |
85 | static int ceph_encode_fh(struct inode *inode, u32 *rawfh, int *max_len, |
86 | struct inode *parent_inode) | |
a8e63b7d | 87 | { |
536cc331 | 88 | static const int handle_length = |
570df4e9 | 89 | sizeof(struct ceph_nfs_fh) >> 2; |
536cc331 | 90 | static const int connected_handle_length = |
570df4e9 | 91 | sizeof(struct ceph_nfs_confh) >> 2; |
92923dcb | 92 | int type; |
a8e63b7d | 93 | |
a8e63b7d | 94 | if (ceph_snap(inode) != CEPH_NOSNAP) |
570df4e9 | 95 | return ceph_encode_snapfh(inode, rawfh, max_len, parent_inode); |
a8e63b7d | 96 | |
4f32b42d YZ |
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 | } | |
f6af75da | 104 | |
4f32b42d | 105 | if (parent_inode) { |
570df4e9 | 106 | struct ceph_nfs_confh *cfh = (void *)rawfh; |
4f32b42d YZ |
107 | dout("encode_fh %llx with parent %llx\n", |
108 | ceph_ino(inode), ceph_ino(parent_inode)); | |
c862868b | 109 | cfh->ino = ceph_ino(inode); |
4f32b42d | 110 | cfh->parent_ino = ceph_ino(parent_inode); |
92923dcb | 111 | *max_len = connected_handle_length; |
4f32b42d | 112 | type = FILEID_INO32_GEN_PARENT; |
a8e63b7d | 113 | } else { |
570df4e9 | 114 | struct ceph_nfs_fh *fh = (void *)rawfh; |
4f32b42d YZ |
115 | dout("encode_fh %llx\n", ceph_ino(inode)); |
116 | fh->ino = ceph_ino(inode); | |
bba0cd0e | 117 | *max_len = handle_length; |
4f32b42d | 118 | type = FILEID_INO32_GEN; |
a8e63b7d SW |
119 | } |
120 | return type; | |
121 | } | |
122 | ||
570df4e9 | 123 | static struct inode *__lookup_inode(struct super_block *sb, u64 ino) |
a8e63b7d | 124 | { |
3c454cf2 | 125 | struct ceph_mds_client *mdsc = ceph_sb_to_client(sb)->mdsc; |
a8e63b7d | 126 | struct inode *inode; |
a8e63b7d SW |
127 | struct ceph_vino vino; |
128 | int err; | |
129 | ||
4f32b42d | 130 | vino.ino = ino; |
a8e63b7d | 131 | vino.snap = CEPH_NOSNAP; |
d4f6b31d JL |
132 | |
133 | if (ceph_vino_is_reserved(vino)) | |
134 | return ERR_PTR(-ESTALE); | |
135 | ||
a8e63b7d | 136 | inode = ceph_find_inode(sb, vino); |
3c454cf2 SW |
137 | if (!inode) { |
138 | struct ceph_mds_request *req; | |
315f2408 | 139 | int mask; |
3c454cf2 SW |
140 | |
141 | req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LOOKUPINO, | |
142 | USE_ANY_MDS); | |
143 | if (IS_ERR(req)) | |
144 | return ERR_CAST(req); | |
145 | ||
315f2408 YZ |
146 | mask = CEPH_STAT_CAP_INODE; |
147 | if (ceph_security_xattr_wanted(d_inode(sb->s_root))) | |
148 | mask |= CEPH_CAP_XATTR_SHARED; | |
570df4e9 | 149 | req->r_args.lookupino.mask = cpu_to_le32(mask); |
315f2408 | 150 | |
3c454cf2 SW |
151 | req->r_ino1 = vino; |
152 | req->r_num_caps = 1; | |
153 | err = ceph_mdsc_do_request(mdsc, NULL, req); | |
45e3d3ee SW |
154 | inode = req->r_target_inode; |
155 | if (inode) | |
70b666c3 | 156 | ihold(inode); |
3c454cf2 | 157 | ceph_mdsc_put_request(req); |
3c454cf2 | 158 | if (!inode) |
3886274a | 159 | return err < 0 ? ERR_PTR(err) : ERR_PTR(-ESTALE); |
5d6451b1 JL |
160 | } else { |
161 | if (ceph_inode_is_shutdown(inode)) { | |
162 | iput(inode); | |
163 | return ERR_PTR(-ESTALE); | |
164 | } | |
3c454cf2 | 165 | } |
570df4e9 YZ |
166 | return inode; |
167 | } | |
a8e63b7d | 168 | |
570df4e9 YZ |
169 | struct inode *ceph_lookup_inode(struct super_block *sb, u64 ino) |
170 | { | |
171 | struct inode *inode = __lookup_inode(sb, ino); | |
172 | if (IS_ERR(inode)) | |
173 | return inode; | |
174 | if (inode->i_nlink == 0) { | |
175 | iput(inode); | |
176 | return ERR_PTR(-ESTALE); | |
177 | } | |
3886274a LH |
178 | return inode; |
179 | } | |
180 | ||
181 | static struct dentry *__fh_to_dentry(struct super_block *sb, u64 ino) | |
182 | { | |
570df4e9 | 183 | struct inode *inode = __lookup_inode(sb, ino); |
878dabb6 LH |
184 | int err; |
185 | ||
3886274a LH |
186 | if (IS_ERR(inode)) |
187 | return ERR_CAST(inode); | |
878dabb6 LH |
188 | /* We need LINK caps to reliably check i_nlink */ |
189 | err = ceph_do_getattr(inode, CEPH_CAP_LINK_SHARED, false); | |
1775c7dd JL |
190 | if (err) { |
191 | iput(inode); | |
878dabb6 | 192 | return ERR_PTR(err); |
1775c7dd | 193 | } |
878dabb6 LH |
194 | /* -ESTALE if inode as been unlinked and no file is open */ |
195 | if ((inode->i_nlink == 0) && (atomic_read(&inode->i_count) == 1)) { | |
570df4e9 YZ |
196 | iput(inode); |
197 | return ERR_PTR(-ESTALE); | |
198 | } | |
ad5cb123 | 199 | return d_obtain_alias(inode); |
a8e63b7d SW |
200 | } |
201 | ||
570df4e9 YZ |
202 | static struct dentry *__snapfh_to_dentry(struct super_block *sb, |
203 | struct ceph_nfs_snapfh *sfh, | |
204 | bool want_parent) | |
205 | { | |
206 | struct ceph_mds_client *mdsc = ceph_sb_to_client(sb)->mdsc; | |
207 | struct ceph_mds_request *req; | |
208 | struct inode *inode; | |
209 | struct ceph_vino vino; | |
210 | int mask; | |
211 | int err; | |
212 | bool unlinked = false; | |
213 | ||
214 | if (want_parent) { | |
215 | vino.ino = sfh->parent_ino; | |
216 | if (sfh->snapid == CEPH_SNAPDIR) | |
217 | vino.snap = CEPH_NOSNAP; | |
218 | else if (sfh->ino == sfh->parent_ino) | |
219 | vino.snap = CEPH_SNAPDIR; | |
220 | else | |
221 | vino.snap = sfh->snapid; | |
222 | } else { | |
223 | vino.ino = sfh->ino; | |
224 | vino.snap = sfh->snapid; | |
225 | } | |
d4f6b31d JL |
226 | |
227 | if (ceph_vino_is_reserved(vino)) | |
228 | return ERR_PTR(-ESTALE); | |
229 | ||
570df4e9 | 230 | inode = ceph_find_inode(sb, vino); |
5d6451b1 JL |
231 | if (inode) { |
232 | if (ceph_inode_is_shutdown(inode)) { | |
233 | iput(inode); | |
234 | return ERR_PTR(-ESTALE); | |
235 | } | |
570df4e9 | 236 | return d_obtain_alias(inode); |
5d6451b1 | 237 | } |
570df4e9 YZ |
238 | |
239 | req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LOOKUPINO, | |
240 | USE_ANY_MDS); | |
241 | if (IS_ERR(req)) | |
242 | return ERR_CAST(req); | |
243 | ||
244 | mask = CEPH_STAT_CAP_INODE; | |
245 | if (ceph_security_xattr_wanted(d_inode(sb->s_root))) | |
246 | mask |= CEPH_CAP_XATTR_SHARED; | |
247 | req->r_args.lookupino.mask = cpu_to_le32(mask); | |
248 | if (vino.snap < CEPH_NOSNAP) { | |
249 | req->r_args.lookupino.snapid = cpu_to_le64(vino.snap); | |
250 | if (!want_parent && sfh->ino != sfh->parent_ino) { | |
251 | req->r_args.lookupino.parent = | |
252 | cpu_to_le64(sfh->parent_ino); | |
253 | req->r_args.lookupino.hash = | |
254 | cpu_to_le32(sfh->hash); | |
255 | } | |
256 | } | |
257 | ||
258 | req->r_ino1 = vino; | |
259 | req->r_num_caps = 1; | |
260 | err = ceph_mdsc_do_request(mdsc, NULL, req); | |
261 | inode = req->r_target_inode; | |
262 | if (inode) { | |
263 | if (vino.snap == CEPH_SNAPDIR) { | |
264 | if (inode->i_nlink == 0) | |
265 | unlinked = true; | |
266 | inode = ceph_get_snapdir(inode); | |
267 | } else if (ceph_snap(inode) == vino.snap) { | |
268 | ihold(inode); | |
269 | } else { | |
270 | /* mds does not support lookup snapped inode */ | |
3e10a15f | 271 | inode = ERR_PTR(-EOPNOTSUPP); |
570df4e9 | 272 | } |
3e10a15f JL |
273 | } else { |
274 | inode = ERR_PTR(-ESTALE); | |
570df4e9 YZ |
275 | } |
276 | ceph_mdsc_put_request(req); | |
277 | ||
278 | if (want_parent) { | |
279 | dout("snapfh_to_parent %llx.%llx\n err=%d\n", | |
280 | vino.ino, vino.snap, err); | |
281 | } else { | |
282 | dout("snapfh_to_dentry %llx.%llx parent %llx hash %x err=%d", | |
283 | vino.ino, vino.snap, sfh->parent_ino, sfh->hash, err); | |
284 | } | |
3e10a15f JL |
285 | if (IS_ERR(inode)) |
286 | return ERR_CAST(inode); | |
570df4e9 YZ |
287 | /* see comments in ceph_get_parent() */ |
288 | return unlinked ? d_obtain_root(inode) : d_obtain_alias(inode); | |
289 | } | |
290 | ||
a8e63b7d | 291 | /* |
4f32b42d | 292 | * convert regular fh to dentry |
a8e63b7d | 293 | */ |
4f32b42d YZ |
294 | static struct dentry *ceph_fh_to_dentry(struct super_block *sb, |
295 | struct fid *fid, | |
296 | int fh_len, int fh_type) | |
a8e63b7d | 297 | { |
4f32b42d | 298 | struct ceph_nfs_fh *fh = (void *)fid->raw; |
a8e63b7d | 299 | |
570df4e9 YZ |
300 | if (fh_type == FILEID_BTRFS_WITH_PARENT) { |
301 | struct ceph_nfs_snapfh *sfh = (void *)fid->raw; | |
302 | return __snapfh_to_dentry(sb, sfh, false); | |
303 | } | |
304 | ||
4f32b42d YZ |
305 | if (fh_type != FILEID_INO32_GEN && |
306 | fh_type != FILEID_INO32_GEN_PARENT) | |
307 | return NULL; | |
308 | if (fh_len < sizeof(*fh) / 4) | |
309 | return NULL; | |
a8e63b7d | 310 | |
4f32b42d YZ |
311 | dout("fh_to_dentry %llx\n", fh->ino); |
312 | return __fh_to_dentry(sb, fh->ino); | |
a8e63b7d SW |
313 | } |
314 | ||
9017c2ec YZ |
315 | static struct dentry *__get_parent(struct super_block *sb, |
316 | struct dentry *child, u64 ino) | |
317 | { | |
318 | struct ceph_mds_client *mdsc = ceph_sb_to_client(sb)->mdsc; | |
319 | struct ceph_mds_request *req; | |
320 | struct inode *inode; | |
315f2408 | 321 | int mask; |
9017c2ec YZ |
322 | int err; |
323 | ||
324 | req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LOOKUPPARENT, | |
325 | USE_ANY_MDS); | |
326 | if (IS_ERR(req)) | |
327 | return ERR_CAST(req); | |
328 | ||
329 | if (child) { | |
2b0143b5 DH |
330 | req->r_inode = d_inode(child); |
331 | ihold(d_inode(child)); | |
9017c2ec YZ |
332 | } else { |
333 | req->r_ino1 = (struct ceph_vino) { | |
334 | .ino = ino, | |
335 | .snap = CEPH_NOSNAP, | |
336 | }; | |
337 | } | |
315f2408 YZ |
338 | |
339 | mask = CEPH_STAT_CAP_INODE; | |
340 | if (ceph_security_xattr_wanted(d_inode(sb->s_root))) | |
341 | mask |= CEPH_CAP_XATTR_SHARED; | |
342 | req->r_args.getattr.mask = cpu_to_le32(mask); | |
343 | ||
9017c2ec YZ |
344 | req->r_num_caps = 1; |
345 | err = ceph_mdsc_do_request(mdsc, NULL, req); | |
c6d50296 QH |
346 | if (err) { |
347 | ceph_mdsc_put_request(req); | |
348 | return ERR_PTR(err); | |
349 | } | |
350 | ||
9017c2ec YZ |
351 | inode = req->r_target_inode; |
352 | if (inode) | |
353 | ihold(inode); | |
354 | ceph_mdsc_put_request(req); | |
355 | if (!inode) | |
356 | return ERR_PTR(-ENOENT); | |
357 | ||
ad5cb123 | 358 | return d_obtain_alias(inode); |
9017c2ec YZ |
359 | } |
360 | ||
e84be11c | 361 | static struct dentry *ceph_get_parent(struct dentry *child) |
9017c2ec | 362 | { |
570df4e9 YZ |
363 | struct inode *inode = d_inode(child); |
364 | struct dentry *dn; | |
365 | ||
366 | if (ceph_snap(inode) != CEPH_NOSNAP) { | |
367 | struct inode* dir; | |
368 | bool unlinked = false; | |
369 | /* do not support non-directory */ | |
370 | if (!d_is_dir(child)) { | |
371 | dn = ERR_PTR(-EINVAL); | |
372 | goto out; | |
373 | } | |
374 | dir = __lookup_inode(inode->i_sb, ceph_ino(inode)); | |
375 | if (IS_ERR(dir)) { | |
376 | dn = ERR_CAST(dir); | |
377 | goto out; | |
378 | } | |
379 | /* There can be multiple paths to access snapped inode. | |
380 | * For simplicity, treat snapdir of head inode as parent */ | |
381 | if (ceph_snap(inode) != CEPH_SNAPDIR) { | |
382 | struct inode *snapdir = ceph_get_snapdir(dir); | |
383 | if (dir->i_nlink == 0) | |
384 | unlinked = true; | |
385 | iput(dir); | |
386 | if (IS_ERR(snapdir)) { | |
387 | dn = ERR_CAST(snapdir); | |
388 | goto out; | |
389 | } | |
390 | dir = snapdir; | |
391 | } | |
392 | /* If directory has already been deleted, futher get_parent | |
393 | * will fail. Do not mark snapdir dentry as disconnected, | |
394 | * this prevent exportfs from doing futher get_parent. */ | |
395 | if (unlinked) | |
396 | dn = d_obtain_root(dir); | |
397 | else | |
398 | dn = d_obtain_alias(dir); | |
399 | } else { | |
400 | dn = __get_parent(child->d_sb, child, 0); | |
401 | } | |
402 | out: | |
403 | dout("get_parent %p ino %llx.%llx err=%ld\n", | |
03af439a | 404 | child, ceph_vinop(inode), (long)PTR_ERR_OR_ZERO(dn)); |
570df4e9 | 405 | return dn; |
9017c2ec YZ |
406 | } |
407 | ||
a8e63b7d | 408 | /* |
8996f4f2 | 409 | * convert regular fh to parent |
a8e63b7d SW |
410 | */ |
411 | static struct dentry *ceph_fh_to_parent(struct super_block *sb, | |
8996f4f2 | 412 | struct fid *fid, |
a8e63b7d SW |
413 | int fh_len, int fh_type) |
414 | { | |
415 | struct ceph_nfs_confh *cfh = (void *)fid->raw; | |
a8e63b7d | 416 | struct dentry *dentry; |
a8e63b7d | 417 | |
570df4e9 YZ |
418 | if (fh_type == FILEID_BTRFS_WITH_PARENT) { |
419 | struct ceph_nfs_snapfh *sfh = (void *)fid->raw; | |
420 | return __snapfh_to_dentry(sb, sfh, true); | |
421 | } | |
422 | ||
8996f4f2 YZ |
423 | if (fh_type != FILEID_INO32_GEN_PARENT) |
424 | return NULL; | |
35c2a7f4 | 425 | if (fh_len < sizeof(*cfh) / 4) |
8996f4f2 | 426 | return NULL; |
a8e63b7d | 427 | |
8996f4f2 YZ |
428 | dout("fh_to_parent %llx\n", cfh->parent_ino); |
429 | dentry = __get_parent(sb, NULL, cfh->ino); | |
b42b90d1 | 430 | if (unlikely(dentry == ERR_PTR(-ENOENT))) |
8996f4f2 | 431 | dentry = __fh_to_dentry(sb, cfh->parent_ino); |
a8e63b7d SW |
432 | return dentry; |
433 | } | |
434 | ||
570df4e9 YZ |
435 | static int __get_snap_name(struct dentry *parent, char *name, |
436 | struct dentry *child) | |
437 | { | |
438 | struct inode *inode = d_inode(child); | |
439 | struct inode *dir = d_inode(parent); | |
440 | struct ceph_fs_client *fsc = ceph_inode_to_client(inode); | |
441 | struct ceph_mds_request *req = NULL; | |
442 | char *last_name = NULL; | |
443 | unsigned next_offset = 2; | |
444 | int err = -EINVAL; | |
445 | ||
446 | if (ceph_ino(inode) != ceph_ino(dir)) | |
447 | goto out; | |
448 | if (ceph_snap(inode) == CEPH_SNAPDIR) { | |
449 | if (ceph_snap(dir) == CEPH_NOSNAP) { | |
450 | strcpy(name, fsc->mount_options->snapdir_name); | |
451 | err = 0; | |
452 | } | |
453 | goto out; | |
454 | } | |
455 | if (ceph_snap(dir) != CEPH_SNAPDIR) | |
456 | goto out; | |
457 | ||
458 | while (1) { | |
459 | struct ceph_mds_reply_info_parsed *rinfo; | |
460 | struct ceph_mds_reply_dir_entry *rde; | |
461 | int i; | |
462 | ||
463 | req = ceph_mdsc_create_request(fsc->mdsc, CEPH_MDS_OP_LSSNAP, | |
464 | USE_AUTH_MDS); | |
465 | if (IS_ERR(req)) { | |
466 | err = PTR_ERR(req); | |
467 | req = NULL; | |
468 | goto out; | |
469 | } | |
470 | err = ceph_alloc_readdir_reply_buffer(req, inode); | |
471 | if (err) | |
472 | goto out; | |
473 | ||
474 | req->r_direct_mode = USE_AUTH_MDS; | |
475 | req->r_readdir_offset = next_offset; | |
476 | req->r_args.readdir.flags = | |
477 | cpu_to_le16(CEPH_READDIR_REPLY_BITFLAGS); | |
478 | if (last_name) { | |
479 | req->r_path2 = last_name; | |
480 | last_name = NULL; | |
481 | } | |
482 | ||
483 | req->r_inode = dir; | |
484 | ihold(dir); | |
485 | req->r_dentry = dget(parent); | |
486 | ||
487 | inode_lock(dir); | |
488 | err = ceph_mdsc_do_request(fsc->mdsc, NULL, req); | |
489 | inode_unlock(dir); | |
490 | ||
491 | if (err < 0) | |
492 | goto out; | |
493 | ||
0ed26f36 ID |
494 | rinfo = &req->r_reply_info; |
495 | for (i = 0; i < rinfo->dir_nr; i++) { | |
496 | rde = rinfo->dir_entries + i; | |
497 | BUG_ON(!rde->inode.in); | |
498 | if (ceph_snap(inode) == | |
499 | le64_to_cpu(rde->inode.in->snapid)) { | |
500 | memcpy(name, rde->name, rde->name_len); | |
501 | name[rde->name_len] = '\0'; | |
502 | err = 0; | |
503 | goto out; | |
504 | } | |
505 | } | |
506 | ||
507 | if (rinfo->dir_end) | |
508 | break; | |
509 | ||
510 | BUG_ON(rinfo->dir_nr <= 0); | |
511 | rde = rinfo->dir_entries + (rinfo->dir_nr - 1); | |
512 | next_offset += rinfo->dir_nr; | |
513 | last_name = kstrndup(rde->name, rde->name_len, GFP_KERNEL); | |
514 | if (!last_name) { | |
515 | err = -ENOMEM; | |
516 | goto out; | |
517 | } | |
518 | ||
519 | ceph_mdsc_put_request(req); | |
520 | req = NULL; | |
570df4e9 YZ |
521 | } |
522 | err = -ENOENT; | |
523 | out: | |
524 | if (req) | |
525 | ceph_mdsc_put_request(req); | |
526 | kfree(last_name); | |
527 | dout("get_snap_name %p ino %llx.%llx err=%d\n", | |
528 | child, ceph_vinop(inode), err); | |
529 | return err; | |
530 | } | |
531 | ||
19913b4e YZ |
532 | static int ceph_get_name(struct dentry *parent, char *name, |
533 | struct dentry *child) | |
534 | { | |
535 | struct ceph_mds_client *mdsc; | |
536 | struct ceph_mds_request *req; | |
570df4e9 | 537 | struct inode *inode = d_inode(child); |
19913b4e YZ |
538 | int err; |
539 | ||
570df4e9 YZ |
540 | if (ceph_snap(inode) != CEPH_NOSNAP) |
541 | return __get_snap_name(parent, name, child); | |
542 | ||
543 | mdsc = ceph_inode_to_client(inode)->mdsc; | |
19913b4e YZ |
544 | req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LOOKUPNAME, |
545 | USE_ANY_MDS); | |
546 | if (IS_ERR(req)) | |
547 | return PTR_ERR(req); | |
548 | ||
5955102c | 549 | inode_lock(d_inode(parent)); |
19913b4e | 550 | |
570df4e9 YZ |
551 | req->r_inode = inode; |
552 | ihold(inode); | |
2b0143b5 | 553 | req->r_ino2 = ceph_vino(d_inode(parent)); |
3dd69aab | 554 | req->r_parent = d_inode(parent); |
4c183472 | 555 | ihold(req->r_parent); |
3dd69aab | 556 | set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags); |
19913b4e YZ |
557 | req->r_num_caps = 2; |
558 | err = ceph_mdsc_do_request(mdsc, NULL, req); | |
559 | ||
5955102c | 560 | inode_unlock(d_inode(parent)); |
19913b4e YZ |
561 | |
562 | if (!err) { | |
563 | struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info; | |
564 | memcpy(name, rinfo->dname, rinfo->dname_len); | |
565 | name[rinfo->dname_len] = 0; | |
566 | dout("get_name %p ino %llx.%llx name %s\n", | |
570df4e9 | 567 | child, ceph_vinop(inode), name); |
19913b4e YZ |
568 | } else { |
569 | dout("get_name %p ino %llx.%llx err %d\n", | |
570df4e9 | 570 | child, ceph_vinop(inode), err); |
19913b4e YZ |
571 | } |
572 | ||
573 | ceph_mdsc_put_request(req); | |
574 | return err; | |
575 | } | |
576 | ||
a8e63b7d SW |
577 | const struct export_operations ceph_export_ops = { |
578 | .encode_fh = ceph_encode_fh, | |
579 | .fh_to_dentry = ceph_fh_to_dentry, | |
580 | .fh_to_parent = ceph_fh_to_parent, | |
9017c2ec | 581 | .get_parent = ceph_get_parent, |
19913b4e | 582 | .get_name = ceph_get_name, |
a8e63b7d | 583 | }; |