1 // SPDX-License-Identifier: GPL-2.0
2
3 #include "bcachefs.h"
4 #include "acl.h"
5 #include "btree_update.h"
6 #include "dirent.h"
7 #include "fs-common.h"
8 #include "inode.h"
9 #include "subvolume.h"
10 #include "xattr.h"
11
12 #include <linux/posix_acl.h>
13
is_subdir_for_nlink(struct bch_inode_unpacked * inode)14 static inline int is_subdir_for_nlink(struct bch_inode_unpacked *inode)
15 {
16 return S_ISDIR(inode->bi_mode) && !inode->bi_subvol;
17 }
18
bch2_create_trans(struct btree_trans * trans,subvol_inum dir,struct bch_inode_unpacked * dir_u,struct bch_inode_unpacked * new_inode,const struct qstr * name,uid_t uid,gid_t gid,umode_t mode,dev_t rdev,struct posix_acl * default_acl,struct posix_acl * acl,subvol_inum snapshot_src,unsigned flags)19 int bch2_create_trans(struct btree_trans *trans,
20 subvol_inum dir,
21 struct bch_inode_unpacked *dir_u,
22 struct bch_inode_unpacked *new_inode,
23 const struct qstr *name,
24 uid_t uid, gid_t gid, umode_t mode, dev_t rdev,
25 struct posix_acl *default_acl,
26 struct posix_acl *acl,
27 subvol_inum snapshot_src,
28 unsigned flags)
29 {
30 struct bch_fs *c = trans->c;
31 struct btree_iter dir_iter = { NULL };
32 struct btree_iter inode_iter = { NULL };
33 subvol_inum new_inum = dir;
34 u64 now = bch2_current_time(c);
35 u64 cpu = raw_smp_processor_id();
36 u64 dir_target;
37 u32 snapshot;
38 unsigned dir_type = mode_to_type(mode);
39 int ret;
40
41 ret = bch2_subvolume_get_snapshot(trans, dir.subvol, &snapshot);
42 if (ret)
43 goto err;
44
45 ret = bch2_inode_peek(trans, &dir_iter, dir_u, dir,
46 BTREE_ITER_intent|BTREE_ITER_with_updates);
47 if (ret)
48 goto err;
49
50 if (!(flags & BCH_CREATE_SNAPSHOT)) {
51 /* Normal create path - allocate a new inode: */
52 bch2_inode_init_late(new_inode, now, uid, gid, mode, rdev, dir_u);
53
54 if (flags & BCH_CREATE_TMPFILE)
55 new_inode->bi_flags |= BCH_INODE_unlinked;
56
57 ret = bch2_inode_create(trans, &inode_iter, new_inode, snapshot, cpu);
58 if (ret)
59 goto err;
60
61 snapshot_src = (subvol_inum) { 0 };
62 } else {
63 /*
64 * Creating a snapshot - we're not allocating a new inode, but
65 * we do have to lookup the root inode of the subvolume we're
66 * snapshotting and update it (in the new snapshot):
67 */
68
69 if (!snapshot_src.inum) {
70 /* Inode wasn't specified, just snapshot: */
71 struct bch_subvolume s;
72 ret = bch2_subvolume_get(trans, snapshot_src.subvol, true, &s);
73 if (ret)
74 goto err;
75
76 snapshot_src.inum = le64_to_cpu(s.inode);
77 }
78
79 ret = bch2_inode_peek(trans, &inode_iter, new_inode, snapshot_src,
80 BTREE_ITER_intent);
81 if (ret)
82 goto err;
83
84 if (new_inode->bi_subvol != snapshot_src.subvol) {
85 /* Not a subvolume root: */
86 ret = -EINVAL;
87 goto err;
88 }
89
90 /*
91 * If we're not root, we have to own the subvolume being
92 * snapshotted:
93 */
94 if (uid && new_inode->bi_uid != uid) {
95 ret = -EPERM;
96 goto err;
97 }
98
99 flags |= BCH_CREATE_SUBVOL;
100 }
101
102 new_inum.inum = new_inode->bi_inum;
103 dir_target = new_inode->bi_inum;
104
105 if (flags & BCH_CREATE_SUBVOL) {
106 u32 new_subvol, dir_snapshot;
107
108 ret = bch2_subvolume_create(trans, new_inode->bi_inum,
109 dir.subvol,
110 snapshot_src.subvol,
111 &new_subvol, &snapshot,
112 (flags & BCH_CREATE_SNAPSHOT_RO) != 0);
113 if (ret)
114 goto err;
115
116 new_inode->bi_parent_subvol = dir.subvol;
117 new_inode->bi_subvol = new_subvol;
118 new_inum.subvol = new_subvol;
119 dir_target = new_subvol;
120 dir_type = DT_SUBVOL;
121
122 ret = bch2_subvolume_get_snapshot(trans, dir.subvol, &dir_snapshot);
123 if (ret)
124 goto err;
125
126 bch2_btree_iter_set_snapshot(&dir_iter, dir_snapshot);
127 ret = bch2_btree_iter_traverse(&dir_iter);
128 if (ret)
129 goto err;
130 }
131
132 if (!(flags & BCH_CREATE_SNAPSHOT)) {
133 if (default_acl) {
134 ret = bch2_set_acl_trans(trans, new_inum, new_inode,
135 default_acl, ACL_TYPE_DEFAULT);
136 if (ret)
137 goto err;
138 }
139
140 if (acl) {
141 ret = bch2_set_acl_trans(trans, new_inum, new_inode,
142 acl, ACL_TYPE_ACCESS);
143 if (ret)
144 goto err;
145 }
146 }
147
148 if (!(flags & BCH_CREATE_TMPFILE)) {
149 struct bch_hash_info dir_hash = bch2_hash_info_init(c, dir_u);
150 u64 dir_offset;
151
152 if (is_subdir_for_nlink(new_inode))
153 dir_u->bi_nlink++;
154 dir_u->bi_mtime = dir_u->bi_ctime = now;
155
156 ret = bch2_inode_write(trans, &dir_iter, dir_u);
157 if (ret)
158 goto err;
159
160 ret = bch2_dirent_create(trans, dir, &dir_hash,
161 dir_type,
162 name,
163 dir_target,
164 &dir_offset,
165 STR_HASH_must_create|BTREE_ITER_with_updates);
166 if (ret)
167 goto err;
168
169 new_inode->bi_dir = dir_u->bi_inum;
170 new_inode->bi_dir_offset = dir_offset;
171 }
172
173 if (S_ISDIR(mode) &&
174 !new_inode->bi_subvol)
175 new_inode->bi_depth = dir_u->bi_depth + 1;
176
177 inode_iter.flags &= ~BTREE_ITER_all_snapshots;
178 bch2_btree_iter_set_snapshot(&inode_iter, snapshot);
179
180 ret = bch2_btree_iter_traverse(&inode_iter) ?:
181 bch2_inode_write(trans, &inode_iter, new_inode);
182 err:
183 bch2_trans_iter_exit(trans, &inode_iter);
184 bch2_trans_iter_exit(trans, &dir_iter);
185 return ret;
186 }
187
bch2_link_trans(struct btree_trans * trans,subvol_inum dir,struct bch_inode_unpacked * dir_u,subvol_inum inum,struct bch_inode_unpacked * inode_u,const struct qstr * name)188 int bch2_link_trans(struct btree_trans *trans,
189 subvol_inum dir, struct bch_inode_unpacked *dir_u,
190 subvol_inum inum, struct bch_inode_unpacked *inode_u,
191 const struct qstr *name)
192 {
193 struct bch_fs *c = trans->c;
194 struct btree_iter dir_iter = { NULL };
195 struct btree_iter inode_iter = { NULL };
196 struct bch_hash_info dir_hash;
197 u64 now = bch2_current_time(c);
198 u64 dir_offset = 0;
199 int ret;
200
201 if (dir.subvol != inum.subvol)
202 return -EXDEV;
203
204 ret = bch2_inode_peek(trans, &inode_iter, inode_u, inum, BTREE_ITER_intent);
205 if (ret)
206 return ret;
207
208 inode_u->bi_ctime = now;
209 ret = bch2_inode_nlink_inc(inode_u);
210 if (ret)
211 goto err;
212
213 ret = bch2_inode_peek(trans, &dir_iter, dir_u, dir, BTREE_ITER_intent);
214 if (ret)
215 goto err;
216
217 if (bch2_reinherit_attrs(inode_u, dir_u)) {
218 ret = -EXDEV;
219 goto err;
220 }
221
222 dir_u->bi_mtime = dir_u->bi_ctime = now;
223
224 dir_hash = bch2_hash_info_init(c, dir_u);
225
226 ret = bch2_dirent_create(trans, dir, &dir_hash,
227 mode_to_type(inode_u->bi_mode),
228 name, inum.inum, &dir_offset,
229 STR_HASH_must_create);
230 if (ret)
231 goto err;
232
233 inode_u->bi_dir = dir.inum;
234 inode_u->bi_dir_offset = dir_offset;
235
236 ret = bch2_inode_write(trans, &dir_iter, dir_u) ?:
237 bch2_inode_write(trans, &inode_iter, inode_u);
238 err:
239 bch2_trans_iter_exit(trans, &dir_iter);
240 bch2_trans_iter_exit(trans, &inode_iter);
241 return ret;
242 }
243
bch2_unlink_trans(struct btree_trans * trans,subvol_inum dir,struct bch_inode_unpacked * dir_u,struct bch_inode_unpacked * inode_u,const struct qstr * name,bool deleting_subvol)244 int bch2_unlink_trans(struct btree_trans *trans,
245 subvol_inum dir,
246 struct bch_inode_unpacked *dir_u,
247 struct bch_inode_unpacked *inode_u,
248 const struct qstr *name,
249 bool deleting_subvol)
250 {
251 struct bch_fs *c = trans->c;
252 struct btree_iter dir_iter = { NULL };
253 struct btree_iter dirent_iter = { NULL };
254 struct btree_iter inode_iter = { NULL };
255 struct bch_hash_info dir_hash;
256 subvol_inum inum;
257 u64 now = bch2_current_time(c);
258 struct bkey_s_c k;
259 int ret;
260
261 ret = bch2_inode_peek(trans, &dir_iter, dir_u, dir, BTREE_ITER_intent);
262 if (ret)
263 goto err;
264
265 dir_hash = bch2_hash_info_init(c, dir_u);
266
267 ret = bch2_dirent_lookup_trans(trans, &dirent_iter, dir, &dir_hash,
268 name, &inum, BTREE_ITER_intent);
269 if (ret)
270 goto err;
271
272 ret = bch2_inode_peek(trans, &inode_iter, inode_u, inum,
273 BTREE_ITER_intent);
274 if (ret)
275 goto err;
276
277 if (!deleting_subvol && S_ISDIR(inode_u->bi_mode)) {
278 ret = bch2_empty_dir_trans(trans, inum);
279 if (ret)
280 goto err;
281 }
282
283 if (deleting_subvol && !inode_u->bi_subvol) {
284 ret = -BCH_ERR_ENOENT_not_subvol;
285 goto err;
286 }
287
288 if (inode_u->bi_subvol) {
289 /* Recursive subvolume destroy not allowed (yet?) */
290 ret = bch2_subvol_has_children(trans, inode_u->bi_subvol);
291 if (ret)
292 goto err;
293 }
294
295 if (deleting_subvol || inode_u->bi_subvol) {
296 ret = bch2_subvolume_unlink(trans, inode_u->bi_subvol);
297 if (ret)
298 goto err;
299
300 k = bch2_btree_iter_peek_slot(&dirent_iter);
301 ret = bkey_err(k);
302 if (ret)
303 goto err;
304
305 /*
306 * If we're deleting a subvolume, we need to really delete the
307 * dirent, not just emit a whiteout in the current snapshot:
308 */
309 bch2_btree_iter_set_snapshot(&dirent_iter, k.k->p.snapshot);
310 ret = bch2_btree_iter_traverse(&dirent_iter);
311 if (ret)
312 goto err;
313 } else {
314 bch2_inode_nlink_dec(trans, inode_u);
315 }
316
317 if (inode_u->bi_dir == dirent_iter.pos.inode &&
318 inode_u->bi_dir_offset == dirent_iter.pos.offset) {
319 inode_u->bi_dir = 0;
320 inode_u->bi_dir_offset = 0;
321 }
322
323 dir_u->bi_mtime = dir_u->bi_ctime = inode_u->bi_ctime = now;
324 dir_u->bi_nlink -= is_subdir_for_nlink(inode_u);
325
326 ret = bch2_hash_delete_at(trans, bch2_dirent_hash_desc,
327 &dir_hash, &dirent_iter,
328 BTREE_UPDATE_internal_snapshot_node) ?:
329 bch2_inode_write(trans, &dir_iter, dir_u) ?:
330 bch2_inode_write(trans, &inode_iter, inode_u);
331 err:
332 bch2_trans_iter_exit(trans, &inode_iter);
333 bch2_trans_iter_exit(trans, &dirent_iter);
334 bch2_trans_iter_exit(trans, &dir_iter);
335 return ret;
336 }
337
bch2_reinherit_attrs(struct bch_inode_unpacked * dst_u,struct bch_inode_unpacked * src_u)338 bool bch2_reinherit_attrs(struct bch_inode_unpacked *dst_u,
339 struct bch_inode_unpacked *src_u)
340 {
341 u64 src, dst;
342 unsigned id;
343 bool ret = false;
344
345 for (id = 0; id < Inode_opt_nr; id++) {
346 /* Skip attributes that were explicitly set on this inode */
347 if (dst_u->bi_fields_set & (1 << id))
348 continue;
349
350 src = bch2_inode_opt_get(src_u, id);
351 dst = bch2_inode_opt_get(dst_u, id);
352
353 if (src == dst)
354 continue;
355
356 bch2_inode_opt_set(dst_u, id, src);
357 ret = true;
358 }
359
360 return ret;
361 }
362
subvol_update_parent(struct btree_trans * trans,u32 subvol,u32 new_parent)363 static int subvol_update_parent(struct btree_trans *trans, u32 subvol, u32 new_parent)
364 {
365 struct btree_iter iter;
366 struct bkey_i_subvolume *s =
367 bch2_bkey_get_mut_typed(trans, &iter,
368 BTREE_ID_subvolumes, POS(0, subvol),
369 BTREE_ITER_cached, subvolume);
370 int ret = PTR_ERR_OR_ZERO(s);
371 if (ret)
372 return ret;
373
374 s->v.fs_path_parent = cpu_to_le32(new_parent);
375 bch2_trans_iter_exit(trans, &iter);
376 return 0;
377 }
378
bch2_rename_trans(struct btree_trans * trans,subvol_inum src_dir,struct bch_inode_unpacked * src_dir_u,subvol_inum dst_dir,struct bch_inode_unpacked * dst_dir_u,struct bch_inode_unpacked * src_inode_u,struct bch_inode_unpacked * dst_inode_u,const struct qstr * src_name,const struct qstr * dst_name,enum bch_rename_mode mode)379 int bch2_rename_trans(struct btree_trans *trans,
380 subvol_inum src_dir, struct bch_inode_unpacked *src_dir_u,
381 subvol_inum dst_dir, struct bch_inode_unpacked *dst_dir_u,
382 struct bch_inode_unpacked *src_inode_u,
383 struct bch_inode_unpacked *dst_inode_u,
384 const struct qstr *src_name,
385 const struct qstr *dst_name,
386 enum bch_rename_mode mode)
387 {
388 struct bch_fs *c = trans->c;
389 struct btree_iter src_dir_iter = { NULL };
390 struct btree_iter dst_dir_iter = { NULL };
391 struct btree_iter src_inode_iter = { NULL };
392 struct btree_iter dst_inode_iter = { NULL };
393 struct bch_hash_info src_hash, dst_hash;
394 subvol_inum src_inum, dst_inum;
395 u64 src_offset, dst_offset;
396 u64 now = bch2_current_time(c);
397 int ret;
398
399 ret = bch2_inode_peek(trans, &src_dir_iter, src_dir_u, src_dir,
400 BTREE_ITER_intent);
401 if (ret)
402 goto err;
403
404 src_hash = bch2_hash_info_init(c, src_dir_u);
405
406 if (dst_dir.inum != src_dir.inum ||
407 dst_dir.subvol != src_dir.subvol) {
408 ret = bch2_inode_peek(trans, &dst_dir_iter, dst_dir_u, dst_dir,
409 BTREE_ITER_intent);
410 if (ret)
411 goto err;
412
413 dst_hash = bch2_hash_info_init(c, dst_dir_u);
414 } else {
415 dst_dir_u = src_dir_u;
416 dst_hash = src_hash;
417 }
418
419 ret = bch2_dirent_rename(trans,
420 src_dir, &src_hash,
421 dst_dir, &dst_hash,
422 src_name, &src_inum, &src_offset,
423 dst_name, &dst_inum, &dst_offset,
424 mode);
425 if (ret)
426 goto err;
427
428 ret = bch2_inode_peek(trans, &src_inode_iter, src_inode_u, src_inum,
429 BTREE_ITER_intent);
430 if (ret)
431 goto err;
432
433 if (dst_inum.inum) {
434 ret = bch2_inode_peek(trans, &dst_inode_iter, dst_inode_u, dst_inum,
435 BTREE_ITER_intent);
436 if (ret)
437 goto err;
438 }
439
440 if (src_inode_u->bi_subvol &&
441 dst_dir.subvol != src_inode_u->bi_parent_subvol) {
442 ret = subvol_update_parent(trans, src_inode_u->bi_subvol, dst_dir.subvol);
443 if (ret)
444 goto err;
445 }
446
447 if (mode == BCH_RENAME_EXCHANGE &&
448 dst_inode_u->bi_subvol &&
449 src_dir.subvol != dst_inode_u->bi_parent_subvol) {
450 ret = subvol_update_parent(trans, dst_inode_u->bi_subvol, src_dir.subvol);
451 if (ret)
452 goto err;
453 }
454
455 /* Can't move across subvolumes, unless it's a subvolume root: */
456 if (src_dir.subvol != dst_dir.subvol &&
457 (!src_inode_u->bi_subvol ||
458 (dst_inum.inum && !dst_inode_u->bi_subvol))) {
459 ret = -EXDEV;
460 goto err;
461 }
462
463 if (src_inode_u->bi_parent_subvol)
464 src_inode_u->bi_parent_subvol = dst_dir.subvol;
465
466 if ((mode == BCH_RENAME_EXCHANGE) &&
467 dst_inode_u->bi_parent_subvol)
468 dst_inode_u->bi_parent_subvol = src_dir.subvol;
469
470 src_inode_u->bi_dir = dst_dir_u->bi_inum;
471 src_inode_u->bi_dir_offset = dst_offset;
472
473 if (mode == BCH_RENAME_EXCHANGE) {
474 dst_inode_u->bi_dir = src_dir_u->bi_inum;
475 dst_inode_u->bi_dir_offset = src_offset;
476 }
477
478 if (mode == BCH_RENAME_OVERWRITE &&
479 dst_inode_u->bi_dir == dst_dir_u->bi_inum &&
480 dst_inode_u->bi_dir_offset == src_offset) {
481 dst_inode_u->bi_dir = 0;
482 dst_inode_u->bi_dir_offset = 0;
483 }
484
485 if (mode == BCH_RENAME_OVERWRITE) {
486 if (S_ISDIR(src_inode_u->bi_mode) !=
487 S_ISDIR(dst_inode_u->bi_mode)) {
488 ret = -ENOTDIR;
489 goto err;
490 }
491
492 if (S_ISDIR(dst_inode_u->bi_mode)) {
493 ret = bch2_empty_dir_trans(trans, dst_inum);
494 if (ret)
495 goto err;
496 }
497 }
498
499 if (bch2_reinherit_attrs(src_inode_u, dst_dir_u) &&
500 S_ISDIR(src_inode_u->bi_mode)) {
501 ret = -EXDEV;
502 goto err;
503 }
504
505 if (mode == BCH_RENAME_EXCHANGE &&
506 bch2_reinherit_attrs(dst_inode_u, src_dir_u) &&
507 S_ISDIR(dst_inode_u->bi_mode)) {
508 ret = -EXDEV;
509 goto err;
510 }
511
512 if (is_subdir_for_nlink(src_inode_u)) {
513 src_dir_u->bi_nlink--;
514 dst_dir_u->bi_nlink++;
515 }
516
517 if (S_ISDIR(src_inode_u->bi_mode) &&
518 !src_inode_u->bi_subvol)
519 src_inode_u->bi_depth = dst_dir_u->bi_depth + 1;
520
521 if (mode == BCH_RENAME_EXCHANGE &&
522 S_ISDIR(dst_inode_u->bi_mode) &&
523 !dst_inode_u->bi_subvol)
524 dst_inode_u->bi_depth = src_dir_u->bi_depth + 1;
525
526 if (dst_inum.inum && is_subdir_for_nlink(dst_inode_u)) {
527 dst_dir_u->bi_nlink--;
528 src_dir_u->bi_nlink += mode == BCH_RENAME_EXCHANGE;
529 }
530
531 if (mode == BCH_RENAME_OVERWRITE)
532 bch2_inode_nlink_dec(trans, dst_inode_u);
533
534 src_dir_u->bi_mtime = now;
535 src_dir_u->bi_ctime = now;
536
537 if (src_dir.inum != dst_dir.inum) {
538 dst_dir_u->bi_mtime = now;
539 dst_dir_u->bi_ctime = now;
540 }
541
542 src_inode_u->bi_ctime = now;
543
544 if (dst_inum.inum)
545 dst_inode_u->bi_ctime = now;
546
547 ret = bch2_inode_write(trans, &src_dir_iter, src_dir_u) ?:
548 (src_dir.inum != dst_dir.inum
549 ? bch2_inode_write(trans, &dst_dir_iter, dst_dir_u)
550 : 0) ?:
551 bch2_inode_write(trans, &src_inode_iter, src_inode_u) ?:
552 (dst_inum.inum
553 ? bch2_inode_write(trans, &dst_inode_iter, dst_inode_u)
554 : 0);
555 err:
556 bch2_trans_iter_exit(trans, &dst_inode_iter);
557 bch2_trans_iter_exit(trans, &src_inode_iter);
558 bch2_trans_iter_exit(trans, &dst_dir_iter);
559 bch2_trans_iter_exit(trans, &src_dir_iter);
560 return ret;
561 }
562
prt_bytes_reversed(struct printbuf * out,const void * b,unsigned n)563 static inline void prt_bytes_reversed(struct printbuf *out, const void *b, unsigned n)
564 {
565 bch2_printbuf_make_room(out, n);
566
567 unsigned can_print = min(n, printbuf_remaining(out));
568
569 b += n;
570
571 for (unsigned i = 0; i < can_print; i++)
572 out->buf[out->pos++] = *((char *) --b);
573
574 printbuf_nul_terminate(out);
575 }
576
prt_str_reversed(struct printbuf * out,const char * s)577 static inline void prt_str_reversed(struct printbuf *out, const char *s)
578 {
579 prt_bytes_reversed(out, s, strlen(s));
580 }
581
reverse_bytes(void * b,size_t n)582 static inline void reverse_bytes(void *b, size_t n)
583 {
584 char *e = b + n, *s = b;
585
586 while (s < e) {
587 --e;
588 swap(*s, *e);
589 s++;
590 }
591 }
592
593 /* XXX: we don't yet attempt to print paths when we don't know the subvol */
bch2_inum_to_path(struct btree_trans * trans,subvol_inum inum,struct printbuf * path)594 int bch2_inum_to_path(struct btree_trans *trans, subvol_inum inum, struct printbuf *path)
595 {
596 unsigned orig_pos = path->pos;
597 int ret = 0;
598
599 while (!(inum.subvol == BCACHEFS_ROOT_SUBVOL &&
600 inum.inum == BCACHEFS_ROOT_INO)) {
601 struct bch_inode_unpacked inode;
602 ret = bch2_inode_find_by_inum_trans(trans, inum, &inode);
603 if (ret)
604 goto disconnected;
605
606 if (!inode.bi_dir && !inode.bi_dir_offset) {
607 ret = -BCH_ERR_ENOENT_inode_no_backpointer;
608 goto disconnected;
609 }
610
611 inum.subvol = inode.bi_parent_subvol ?: inum.subvol;
612 inum.inum = inode.bi_dir;
613
614 u32 snapshot;
615 ret = bch2_subvolume_get_snapshot(trans, inum.subvol, &snapshot);
616 if (ret)
617 goto disconnected;
618
619 struct btree_iter d_iter;
620 struct bkey_s_c_dirent d = bch2_bkey_get_iter_typed(trans, &d_iter,
621 BTREE_ID_dirents, SPOS(inode.bi_dir, inode.bi_dir_offset, snapshot),
622 0, dirent);
623 ret = bkey_err(d.s_c);
624 if (ret)
625 goto disconnected;
626
627 struct qstr dirent_name = bch2_dirent_get_name(d);
628 prt_bytes_reversed(path, dirent_name.name, dirent_name.len);
629
630 prt_char(path, '/');
631
632 bch2_trans_iter_exit(trans, &d_iter);
633 }
634
635 if (orig_pos == path->pos)
636 prt_char(path, '/');
637 out:
638 ret = path->allocation_failure ? -ENOMEM : 0;
639 if (ret)
640 goto err;
641
642 reverse_bytes(path->buf + orig_pos, path->pos - orig_pos);
643 return 0;
644 err:
645 return ret;
646 disconnected:
647 if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
648 goto err;
649
650 prt_str_reversed(path, "(disconnected)");
651 goto out;
652 }
653