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1// SPDX-License-Identifier: GPL-2.0
2#ifndef NO_BCACHEFS_FS
3
4#include "bcachefs.h"
5#include "acl.h"
6#include "bkey_buf.h"
7#include "btree_update.h"
8#include "buckets.h"
9#include "chardev.h"
10#include "dirent.h"
11#include "errcode.h"
12#include "extents.h"
13#include "fs.h"
14#include "fs-common.h"
15#include "fs-io.h"
16#include "fs-ioctl.h"
17#include "fs-io-buffered.h"
18#include "fs-io-direct.h"
19#include "fs-io-pagecache.h"
20#include "fsck.h"
21#include "inode.h"
22#include "io_read.h"
23#include "journal.h"
24#include "keylist.h"
25#include "quota.h"
26#include "snapshot.h"
27#include "super.h"
28#include "xattr.h"
29
30#include <linux/aio.h>
31#include <linux/backing-dev.h>
32#include <linux/exportfs.h>
33#include <linux/fiemap.h>
34#include <linux/module.h>
35#include <linux/pagemap.h>
36#include <linux/posix_acl.h>
37#include <linux/random.h>
38#include <linux/seq_file.h>
39#include <linux/statfs.h>
40#include <linux/string.h>
41#include <linux/xattr.h>
42
43static struct kmem_cache *bch2_inode_cache;
44
45static void bch2_vfs_inode_init(struct btree_trans *, subvol_inum,
46 struct bch_inode_info *,
47 struct bch_inode_unpacked *,
48 struct bch_subvolume *);
49
50void bch2_inode_update_after_write(struct btree_trans *trans,
51 struct bch_inode_info *inode,
52 struct bch_inode_unpacked *bi,
53 unsigned fields)
54{
55 struct bch_fs *c = trans->c;
56
57 BUG_ON(bi->bi_inum != inode->v.i_ino);
58
59 bch2_assert_pos_locked(trans, BTREE_ID_inodes,
60 POS(0, bi->bi_inum),
61 c->opts.inodes_use_key_cache);
62
63 set_nlink(&inode->v, bch2_inode_nlink_get(bi));
64 i_uid_write(&inode->v, bi->bi_uid);
65 i_gid_write(&inode->v, bi->bi_gid);
66 inode->v.i_mode = bi->bi_mode;
67
68 if (fields & ATTR_ATIME)
69 inode_set_atime_to_ts(&inode->v, bch2_time_to_timespec(c, bi->bi_atime));
70 if (fields & ATTR_MTIME)
71 inode_set_mtime_to_ts(&inode->v, bch2_time_to_timespec(c, bi->bi_mtime));
72 if (fields & ATTR_CTIME)
73 inode_set_ctime_to_ts(&inode->v, bch2_time_to_timespec(c, bi->bi_ctime));
74
75 inode->ei_inode = *bi;
76
77 bch2_inode_flags_to_vfs(inode);
78}
79
80int __must_check bch2_write_inode(struct bch_fs *c,
81 struct bch_inode_info *inode,
82 inode_set_fn set,
83 void *p, unsigned fields)
84{
85 struct btree_trans *trans = bch2_trans_get(c);
86 struct btree_iter iter = { NULL };
87 struct bch_inode_unpacked inode_u;
88 int ret;
89retry:
90 bch2_trans_begin(trans);
91
92 ret = bch2_inode_peek(trans, &iter, &inode_u, inode_inum(inode),
93 BTREE_ITER_INTENT) ?:
94 (set ? set(trans, inode, &inode_u, p) : 0) ?:
95 bch2_inode_write(trans, &iter, &inode_u) ?:
96 bch2_trans_commit(trans, NULL, NULL, BCH_TRANS_COMMIT_no_enospc);
97
98 /*
99 * the btree node lock protects inode->ei_inode, not ei_update_lock;
100 * this is important for inode updates via bchfs_write_index_update
101 */
102 if (!ret)
103 bch2_inode_update_after_write(trans, inode, &inode_u, fields);
104
105 bch2_trans_iter_exit(trans, &iter);
106
107 if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
108 goto retry;
109
110 bch2_fs_fatal_err_on(bch2_err_matches(ret, ENOENT), c,
111 "inode %u:%llu not found when updating",
112 inode_inum(inode).subvol,
113 inode_inum(inode).inum);
114
115 bch2_trans_put(trans);
116 return ret < 0 ? ret : 0;
117}
118
119int bch2_fs_quota_transfer(struct bch_fs *c,
120 struct bch_inode_info *inode,
121 struct bch_qid new_qid,
122 unsigned qtypes,
123 enum quota_acct_mode mode)
124{
125 unsigned i;
126 int ret;
127
128 qtypes &= enabled_qtypes(c);
129
130 for (i = 0; i < QTYP_NR; i++)
131 if (new_qid.q[i] == inode->ei_qid.q[i])
132 qtypes &= ~(1U << i);
133
134 if (!qtypes)
135 return 0;
136
137 mutex_lock(&inode->ei_quota_lock);
138
139 ret = bch2_quota_transfer(c, qtypes, new_qid,
140 inode->ei_qid,
141 inode->v.i_blocks +
142 inode->ei_quota_reserved,
143 mode);
144 if (!ret)
145 for (i = 0; i < QTYP_NR; i++)
146 if (qtypes & (1 << i))
147 inode->ei_qid.q[i] = new_qid.q[i];
148
149 mutex_unlock(&inode->ei_quota_lock);
150
151 return ret;
152}
153
154static int bch2_iget5_test(struct inode *vinode, void *p)
155{
156 struct bch_inode_info *inode = to_bch_ei(vinode);
157 subvol_inum *inum = p;
158
159 return inode->ei_subvol == inum->subvol &&
160 inode->ei_inode.bi_inum == inum->inum;
161}
162
163static int bch2_iget5_set(struct inode *vinode, void *p)
164{
165 struct bch_inode_info *inode = to_bch_ei(vinode);
166 subvol_inum *inum = p;
167
168 inode->v.i_ino = inum->inum;
169 inode->ei_subvol = inum->subvol;
170 inode->ei_inode.bi_inum = inum->inum;
171 return 0;
172}
173
174static unsigned bch2_inode_hash(subvol_inum inum)
175{
176 return jhash_3words(inum.subvol, inum.inum >> 32, inum.inum, JHASH_INITVAL);
177}
178
179struct inode *bch2_vfs_inode_get(struct bch_fs *c, subvol_inum inum)
180{
181 struct bch_inode_unpacked inode_u;
182 struct bch_inode_info *inode;
183 struct btree_trans *trans;
184 struct bch_subvolume subvol;
185 int ret;
186
187 inode = to_bch_ei(iget5_locked(c->vfs_sb,
188 bch2_inode_hash(inum),
189 bch2_iget5_test,
190 bch2_iget5_set,
191 &inum));
192 if (unlikely(!inode))
193 return ERR_PTR(-ENOMEM);
194 if (!(inode->v.i_state & I_NEW))
195 return &inode->v;
196
197 trans = bch2_trans_get(c);
198 ret = lockrestart_do(trans,
199 bch2_subvolume_get(trans, inum.subvol, true, 0, &subvol) ?:
200 bch2_inode_find_by_inum_trans(trans, inum, &inode_u));
201
202 if (!ret)
203 bch2_vfs_inode_init(trans, inum, inode, &inode_u, &subvol);
204 bch2_trans_put(trans);
205
206 if (ret) {
207 iget_failed(&inode->v);
208 return ERR_PTR(bch2_err_class(ret));
209 }
210
211 mutex_lock(&c->vfs_inodes_lock);
212 list_add(&inode->ei_vfs_inode_list, &c->vfs_inodes_list);
213 mutex_unlock(&c->vfs_inodes_lock);
214
215 unlock_new_inode(&inode->v);
216
217 return &inode->v;
218}
219
220struct bch_inode_info *
221__bch2_create(struct mnt_idmap *idmap,
222 struct bch_inode_info *dir, struct dentry *dentry,
223 umode_t mode, dev_t rdev, subvol_inum snapshot_src,
224 unsigned flags)
225{
226 struct bch_fs *c = dir->v.i_sb->s_fs_info;
227 struct btree_trans *trans;
228 struct bch_inode_unpacked dir_u;
229 struct bch_inode_info *inode, *old;
230 struct bch_inode_unpacked inode_u;
231 struct posix_acl *default_acl = NULL, *acl = NULL;
232 subvol_inum inum;
233 struct bch_subvolume subvol;
234 u64 journal_seq = 0;
235 int ret;
236
237 /*
238 * preallocate acls + vfs inode before btree transaction, so that
239 * nothing can fail after the transaction succeeds:
240 */
241#ifdef CONFIG_BCACHEFS_POSIX_ACL
242 ret = posix_acl_create(&dir->v, &mode, &default_acl, &acl);
243 if (ret)
244 return ERR_PTR(ret);
245#endif
246 inode = to_bch_ei(new_inode(c->vfs_sb));
247 if (unlikely(!inode)) {
248 inode = ERR_PTR(-ENOMEM);
249 goto err;
250 }
251
252 bch2_inode_init_early(c, &inode_u);
253
254 if (!(flags & BCH_CREATE_TMPFILE))
255 mutex_lock(&dir->ei_update_lock);
256
257 trans = bch2_trans_get(c);
258retry:
259 bch2_trans_begin(trans);
260
261 ret = bch2_subvol_is_ro_trans(trans, dir->ei_subvol) ?:
262 bch2_create_trans(trans,
263 inode_inum(dir), &dir_u, &inode_u,
264 !(flags & BCH_CREATE_TMPFILE)
265 ? &dentry->d_name : NULL,
266 from_kuid(i_user_ns(&dir->v), current_fsuid()),
267 from_kgid(i_user_ns(&dir->v), current_fsgid()),
268 mode, rdev,
269 default_acl, acl, snapshot_src, flags) ?:
270 bch2_quota_acct(c, bch_qid(&inode_u), Q_INO, 1,
271 KEY_TYPE_QUOTA_PREALLOC);
272 if (unlikely(ret))
273 goto err_before_quota;
274
275 inum.subvol = inode_u.bi_subvol ?: dir->ei_subvol;
276 inum.inum = inode_u.bi_inum;
277
278 ret = bch2_subvolume_get(trans, inum.subvol, true,
279 BTREE_ITER_WITH_UPDATES, &subvol) ?:
280 bch2_trans_commit(trans, NULL, &journal_seq, 0);
281 if (unlikely(ret)) {
282 bch2_quota_acct(c, bch_qid(&inode_u), Q_INO, -1,
283 KEY_TYPE_QUOTA_WARN);
284err_before_quota:
285 if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
286 goto retry;
287 goto err_trans;
288 }
289
290 if (!(flags & BCH_CREATE_TMPFILE)) {
291 bch2_inode_update_after_write(trans, dir, &dir_u,
292 ATTR_MTIME|ATTR_CTIME);
293 mutex_unlock(&dir->ei_update_lock);
294 }
295
296 bch2_iget5_set(&inode->v, &inum);
297 bch2_vfs_inode_init(trans, inum, inode, &inode_u, &subvol);
298
299 set_cached_acl(&inode->v, ACL_TYPE_ACCESS, acl);
300 set_cached_acl(&inode->v, ACL_TYPE_DEFAULT, default_acl);
301
302 /*
303 * we must insert the new inode into the inode cache before calling
304 * bch2_trans_exit() and dropping locks, else we could race with another
305 * thread pulling the inode in and modifying it:
306 */
307
308 inode->v.i_state |= I_CREATING;
309
310 old = to_bch_ei(inode_insert5(&inode->v,
311 bch2_inode_hash(inum),
312 bch2_iget5_test,
313 bch2_iget5_set,
314 &inum));
315 BUG_ON(!old);
316
317 if (unlikely(old != inode)) {
318 /*
319 * We raced, another process pulled the new inode into cache
320 * before us:
321 */
322 make_bad_inode(&inode->v);
323 iput(&inode->v);
324
325 inode = old;
326 } else {
327 mutex_lock(&c->vfs_inodes_lock);
328 list_add(&inode->ei_vfs_inode_list, &c->vfs_inodes_list);
329 mutex_unlock(&c->vfs_inodes_lock);
330 /*
331 * we really don't want insert_inode_locked2() to be setting
332 * I_NEW...
333 */
334 unlock_new_inode(&inode->v);
335 }
336
337 bch2_trans_put(trans);
338err:
339 posix_acl_release(default_acl);
340 posix_acl_release(acl);
341 return inode;
342err_trans:
343 if (!(flags & BCH_CREATE_TMPFILE))
344 mutex_unlock(&dir->ei_update_lock);
345
346 bch2_trans_put(trans);
347 make_bad_inode(&inode->v);
348 iput(&inode->v);
349 inode = ERR_PTR(ret);
350 goto err;
351}
352
353/* methods */
354
355static struct dentry *bch2_lookup(struct inode *vdir, struct dentry *dentry,
356 unsigned int flags)
357{
358 struct bch_fs *c = vdir->i_sb->s_fs_info;
359 struct bch_inode_info *dir = to_bch_ei(vdir);
360 struct bch_hash_info hash = bch2_hash_info_init(c, &dir->ei_inode);
361 struct inode *vinode = NULL;
362 subvol_inum inum = { .subvol = 1 };
363 int ret;
364
365 ret = bch2_dirent_lookup(c, inode_inum(dir), &hash,
366 &dentry->d_name, &inum);
367
368 if (!ret)
369 vinode = bch2_vfs_inode_get(c, inum);
370
371 return d_splice_alias(vinode, dentry);
372}
373
374static int bch2_mknod(struct mnt_idmap *idmap,
375 struct inode *vdir, struct dentry *dentry,
376 umode_t mode, dev_t rdev)
377{
378 struct bch_inode_info *inode =
379 __bch2_create(idmap, to_bch_ei(vdir), dentry, mode, rdev,
380 (subvol_inum) { 0 }, 0);
381
382 if (IS_ERR(inode))
383 return bch2_err_class(PTR_ERR(inode));
384
385 d_instantiate(dentry, &inode->v);
386 return 0;
387}
388
389static int bch2_create(struct mnt_idmap *idmap,
390 struct inode *vdir, struct dentry *dentry,
391 umode_t mode, bool excl)
392{
393 return bch2_mknod(idmap, vdir, dentry, mode|S_IFREG, 0);
394}
395
396static int __bch2_link(struct bch_fs *c,
397 struct bch_inode_info *inode,
398 struct bch_inode_info *dir,
399 struct dentry *dentry)
400{
401 struct btree_trans *trans = bch2_trans_get(c);
402 struct bch_inode_unpacked dir_u, inode_u;
403 int ret;
404
405 mutex_lock(&inode->ei_update_lock);
406
407 ret = commit_do(trans, NULL, NULL, 0,
408 bch2_link_trans(trans,
409 inode_inum(dir), &dir_u,
410 inode_inum(inode), &inode_u,
411 &dentry->d_name));
412
413 if (likely(!ret)) {
414 bch2_inode_update_after_write(trans, dir, &dir_u,
415 ATTR_MTIME|ATTR_CTIME);
416 bch2_inode_update_after_write(trans, inode, &inode_u, ATTR_CTIME);
417 }
418
419 bch2_trans_put(trans);
420 mutex_unlock(&inode->ei_update_lock);
421 return ret;
422}
423
424static int bch2_link(struct dentry *old_dentry, struct inode *vdir,
425 struct dentry *dentry)
426{
427 struct bch_fs *c = vdir->i_sb->s_fs_info;
428 struct bch_inode_info *dir = to_bch_ei(vdir);
429 struct bch_inode_info *inode = to_bch_ei(old_dentry->d_inode);
430 int ret;
431
432 lockdep_assert_held(&inode->v.i_rwsem);
433
434 ret = bch2_subvol_is_ro(c, dir->ei_subvol) ?:
435 bch2_subvol_is_ro(c, inode->ei_subvol) ?:
436 __bch2_link(c, inode, dir, dentry);
437 if (unlikely(ret))
438 return bch2_err_class(ret);
439
440 ihold(&inode->v);
441 d_instantiate(dentry, &inode->v);
442 return 0;
443}
444
445int __bch2_unlink(struct inode *vdir, struct dentry *dentry,
446 bool deleting_snapshot)
447{
448 struct bch_fs *c = vdir->i_sb->s_fs_info;
449 struct bch_inode_info *dir = to_bch_ei(vdir);
450 struct bch_inode_info *inode = to_bch_ei(dentry->d_inode);
451 struct bch_inode_unpacked dir_u, inode_u;
452 struct btree_trans *trans = bch2_trans_get(c);
453 int ret;
454
455 bch2_lock_inodes(INODE_UPDATE_LOCK, dir, inode);
456
457 ret = commit_do(trans, NULL, NULL,
458 BCH_TRANS_COMMIT_no_enospc,
459 bch2_unlink_trans(trans,
460 inode_inum(dir), &dir_u,
461 &inode_u, &dentry->d_name,
462 deleting_snapshot));
463 if (unlikely(ret))
464 goto err;
465
466 bch2_inode_update_after_write(trans, dir, &dir_u,
467 ATTR_MTIME|ATTR_CTIME);
468 bch2_inode_update_after_write(trans, inode, &inode_u,
469 ATTR_MTIME);
470
471 if (inode_u.bi_subvol) {
472 /*
473 * Subvolume deletion is asynchronous, but we still want to tell
474 * the VFS that it's been deleted here:
475 */
476 set_nlink(&inode->v, 0);
477 }
478err:
479 bch2_unlock_inodes(INODE_UPDATE_LOCK, dir, inode);
480 bch2_trans_put(trans);
481
482 return ret;
483}
484
485static int bch2_unlink(struct inode *vdir, struct dentry *dentry)
486{
487 struct bch_inode_info *dir= to_bch_ei(vdir);
488 struct bch_fs *c = dir->v.i_sb->s_fs_info;
489
490 int ret = bch2_subvol_is_ro(c, dir->ei_subvol) ?:
491 __bch2_unlink(vdir, dentry, false);
492 return bch2_err_class(ret);
493}
494
495static int bch2_symlink(struct mnt_idmap *idmap,
496 struct inode *vdir, struct dentry *dentry,
497 const char *symname)
498{
499 struct bch_fs *c = vdir->i_sb->s_fs_info;
500 struct bch_inode_info *dir = to_bch_ei(vdir), *inode;
501 int ret;
502
503 inode = __bch2_create(idmap, dir, dentry, S_IFLNK|S_IRWXUGO, 0,
504 (subvol_inum) { 0 }, BCH_CREATE_TMPFILE);
505 if (IS_ERR(inode))
506 return bch2_err_class(PTR_ERR(inode));
507
508 inode_lock(&inode->v);
509 ret = page_symlink(&inode->v, symname, strlen(symname) + 1);
510 inode_unlock(&inode->v);
511
512 if (unlikely(ret))
513 goto err;
514
515 ret = filemap_write_and_wait_range(inode->v.i_mapping, 0, LLONG_MAX);
516 if (unlikely(ret))
517 goto err;
518
519 ret = __bch2_link(c, inode, dir, dentry);
520 if (unlikely(ret))
521 goto err;
522
523 d_instantiate(dentry, &inode->v);
524 return 0;
525err:
526 iput(&inode->v);
527 return bch2_err_class(ret);
528}
529
530static int bch2_mkdir(struct mnt_idmap *idmap,
531 struct inode *vdir, struct dentry *dentry, umode_t mode)
532{
533 return bch2_mknod(idmap, vdir, dentry, mode|S_IFDIR, 0);
534}
535
536static int bch2_rename2(struct mnt_idmap *idmap,
537 struct inode *src_vdir, struct dentry *src_dentry,
538 struct inode *dst_vdir, struct dentry *dst_dentry,
539 unsigned flags)
540{
541 struct bch_fs *c = src_vdir->i_sb->s_fs_info;
542 struct bch_inode_info *src_dir = to_bch_ei(src_vdir);
543 struct bch_inode_info *dst_dir = to_bch_ei(dst_vdir);
544 struct bch_inode_info *src_inode = to_bch_ei(src_dentry->d_inode);
545 struct bch_inode_info *dst_inode = to_bch_ei(dst_dentry->d_inode);
546 struct bch_inode_unpacked dst_dir_u, src_dir_u;
547 struct bch_inode_unpacked src_inode_u, dst_inode_u;
548 struct btree_trans *trans;
549 enum bch_rename_mode mode = flags & RENAME_EXCHANGE
550 ? BCH_RENAME_EXCHANGE
551 : dst_dentry->d_inode
552 ? BCH_RENAME_OVERWRITE : BCH_RENAME;
553 int ret;
554
555 if (flags & ~(RENAME_NOREPLACE|RENAME_EXCHANGE))
556 return -EINVAL;
557
558 if (mode == BCH_RENAME_OVERWRITE) {
559 ret = filemap_write_and_wait_range(src_inode->v.i_mapping,
560 0, LLONG_MAX);
561 if (ret)
562 return ret;
563 }
564
565 trans = bch2_trans_get(c);
566
567 bch2_lock_inodes(INODE_UPDATE_LOCK,
568 src_dir,
569 dst_dir,
570 src_inode,
571 dst_inode);
572
573 ret = bch2_subvol_is_ro_trans(trans, src_dir->ei_subvol) ?:
574 bch2_subvol_is_ro_trans(trans, dst_dir->ei_subvol);
575 if (ret)
576 goto err;
577
578 if (inode_attr_changing(dst_dir, src_inode, Inode_opt_project)) {
579 ret = bch2_fs_quota_transfer(c, src_inode,
580 dst_dir->ei_qid,
581 1 << QTYP_PRJ,
582 KEY_TYPE_QUOTA_PREALLOC);
583 if (ret)
584 goto err;
585 }
586
587 if (mode == BCH_RENAME_EXCHANGE &&
588 inode_attr_changing(src_dir, dst_inode, Inode_opt_project)) {
589 ret = bch2_fs_quota_transfer(c, dst_inode,
590 src_dir->ei_qid,
591 1 << QTYP_PRJ,
592 KEY_TYPE_QUOTA_PREALLOC);
593 if (ret)
594 goto err;
595 }
596
597 ret = commit_do(trans, NULL, NULL, 0,
598 bch2_rename_trans(trans,
599 inode_inum(src_dir), &src_dir_u,
600 inode_inum(dst_dir), &dst_dir_u,
601 &src_inode_u,
602 &dst_inode_u,
603 &src_dentry->d_name,
604 &dst_dentry->d_name,
605 mode));
606 if (unlikely(ret))
607 goto err;
608
609 BUG_ON(src_inode->v.i_ino != src_inode_u.bi_inum);
610 BUG_ON(dst_inode &&
611 dst_inode->v.i_ino != dst_inode_u.bi_inum);
612
613 bch2_inode_update_after_write(trans, src_dir, &src_dir_u,
614 ATTR_MTIME|ATTR_CTIME);
615
616 if (src_dir != dst_dir)
617 bch2_inode_update_after_write(trans, dst_dir, &dst_dir_u,
618 ATTR_MTIME|ATTR_CTIME);
619
620 bch2_inode_update_after_write(trans, src_inode, &src_inode_u,
621 ATTR_CTIME);
622
623 if (dst_inode)
624 bch2_inode_update_after_write(trans, dst_inode, &dst_inode_u,
625 ATTR_CTIME);
626err:
627 bch2_trans_put(trans);
628
629 bch2_fs_quota_transfer(c, src_inode,
630 bch_qid(&src_inode->ei_inode),
631 1 << QTYP_PRJ,
632 KEY_TYPE_QUOTA_NOCHECK);
633 if (dst_inode)
634 bch2_fs_quota_transfer(c, dst_inode,
635 bch_qid(&dst_inode->ei_inode),
636 1 << QTYP_PRJ,
637 KEY_TYPE_QUOTA_NOCHECK);
638
639 bch2_unlock_inodes(INODE_UPDATE_LOCK,
640 src_dir,
641 dst_dir,
642 src_inode,
643 dst_inode);
644
645 return bch2_err_class(ret);
646}
647
648static void bch2_setattr_copy(struct mnt_idmap *idmap,
649 struct bch_inode_info *inode,
650 struct bch_inode_unpacked *bi,
651 struct iattr *attr)
652{
653 struct bch_fs *c = inode->v.i_sb->s_fs_info;
654 unsigned int ia_valid = attr->ia_valid;
655
656 if (ia_valid & ATTR_UID)
657 bi->bi_uid = from_kuid(i_user_ns(&inode->v), attr->ia_uid);
658 if (ia_valid & ATTR_GID)
659 bi->bi_gid = from_kgid(i_user_ns(&inode->v), attr->ia_gid);
660
661 if (ia_valid & ATTR_SIZE)
662 bi->bi_size = attr->ia_size;
663
664 if (ia_valid & ATTR_ATIME)
665 bi->bi_atime = timespec_to_bch2_time(c, attr->ia_atime);
666 if (ia_valid & ATTR_MTIME)
667 bi->bi_mtime = timespec_to_bch2_time(c, attr->ia_mtime);
668 if (ia_valid & ATTR_CTIME)
669 bi->bi_ctime = timespec_to_bch2_time(c, attr->ia_ctime);
670
671 if (ia_valid & ATTR_MODE) {
672 umode_t mode = attr->ia_mode;
673 kgid_t gid = ia_valid & ATTR_GID
674 ? attr->ia_gid
675 : inode->v.i_gid;
676
677 if (!in_group_p(gid) &&
678 !capable_wrt_inode_uidgid(idmap, &inode->v, CAP_FSETID))
679 mode &= ~S_ISGID;
680 bi->bi_mode = mode;
681 }
682}
683
684int bch2_setattr_nonsize(struct mnt_idmap *idmap,
685 struct bch_inode_info *inode,
686 struct iattr *attr)
687{
688 struct bch_fs *c = inode->v.i_sb->s_fs_info;
689 struct bch_qid qid;
690 struct btree_trans *trans;
691 struct btree_iter inode_iter = { NULL };
692 struct bch_inode_unpacked inode_u;
693 struct posix_acl *acl = NULL;
694 int ret;
695
696 mutex_lock(&inode->ei_update_lock);
697
698 qid = inode->ei_qid;
699
700 if (attr->ia_valid & ATTR_UID)
701 qid.q[QTYP_USR] = from_kuid(i_user_ns(&inode->v), attr->ia_uid);
702
703 if (attr->ia_valid & ATTR_GID)
704 qid.q[QTYP_GRP] = from_kgid(i_user_ns(&inode->v), attr->ia_gid);
705
706 ret = bch2_fs_quota_transfer(c, inode, qid, ~0,
707 KEY_TYPE_QUOTA_PREALLOC);
708 if (ret)
709 goto err;
710
711 trans = bch2_trans_get(c);
712retry:
713 bch2_trans_begin(trans);
714 kfree(acl);
715 acl = NULL;
716
717 ret = bch2_inode_peek(trans, &inode_iter, &inode_u, inode_inum(inode),
718 BTREE_ITER_INTENT);
719 if (ret)
720 goto btree_err;
721
722 bch2_setattr_copy(idmap, inode, &inode_u, attr);
723
724 if (attr->ia_valid & ATTR_MODE) {
725 ret = bch2_acl_chmod(trans, inode_inum(inode), &inode_u,
726 inode_u.bi_mode, &acl);
727 if (ret)
728 goto btree_err;
729 }
730
731 ret = bch2_inode_write(trans, &inode_iter, &inode_u) ?:
732 bch2_trans_commit(trans, NULL, NULL,
733 BCH_TRANS_COMMIT_no_enospc);
734btree_err:
735 bch2_trans_iter_exit(trans, &inode_iter);
736
737 if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
738 goto retry;
739 if (unlikely(ret))
740 goto err_trans;
741
742 bch2_inode_update_after_write(trans, inode, &inode_u, attr->ia_valid);
743
744 if (acl)
745 set_cached_acl(&inode->v, ACL_TYPE_ACCESS, acl);
746err_trans:
747 bch2_trans_put(trans);
748err:
749 mutex_unlock(&inode->ei_update_lock);
750
751 return bch2_err_class(ret);
752}
753
754static int bch2_getattr(struct mnt_idmap *idmap,
755 const struct path *path, struct kstat *stat,
756 u32 request_mask, unsigned query_flags)
757{
758 struct bch_inode_info *inode = to_bch_ei(d_inode(path->dentry));
759 struct bch_fs *c = inode->v.i_sb->s_fs_info;
760
761 stat->dev = inode->v.i_sb->s_dev;
762 stat->ino = inode->v.i_ino;
763 stat->mode = inode->v.i_mode;
764 stat->nlink = inode->v.i_nlink;
765 stat->uid = inode->v.i_uid;
766 stat->gid = inode->v.i_gid;
767 stat->rdev = inode->v.i_rdev;
768 stat->size = i_size_read(&inode->v);
769 stat->atime = inode_get_atime(&inode->v);
770 stat->mtime = inode_get_mtime(&inode->v);
771 stat->ctime = inode_get_ctime(&inode->v);
772 stat->blksize = block_bytes(c);
773 stat->blocks = inode->v.i_blocks;
774
775 if (request_mask & STATX_BTIME) {
776 stat->result_mask |= STATX_BTIME;
777 stat->btime = bch2_time_to_timespec(c, inode->ei_inode.bi_otime);
778 }
779
780 if (inode->ei_inode.bi_flags & BCH_INODE_immutable)
781 stat->attributes |= STATX_ATTR_IMMUTABLE;
782 stat->attributes_mask |= STATX_ATTR_IMMUTABLE;
783
784 if (inode->ei_inode.bi_flags & BCH_INODE_append)
785 stat->attributes |= STATX_ATTR_APPEND;
786 stat->attributes_mask |= STATX_ATTR_APPEND;
787
788 if (inode->ei_inode.bi_flags & BCH_INODE_nodump)
789 stat->attributes |= STATX_ATTR_NODUMP;
790 stat->attributes_mask |= STATX_ATTR_NODUMP;
791
792 return 0;
793}
794
795static int bch2_setattr(struct mnt_idmap *idmap,
796 struct dentry *dentry, struct iattr *iattr)
797{
798 struct bch_inode_info *inode = to_bch_ei(dentry->d_inode);
799 struct bch_fs *c = inode->v.i_sb->s_fs_info;
800 int ret;
801
802 lockdep_assert_held(&inode->v.i_rwsem);
803
804 ret = bch2_subvol_is_ro(c, inode->ei_subvol) ?:
805 setattr_prepare(idmap, dentry, iattr);
806 if (ret)
807 return ret;
808
809 return iattr->ia_valid & ATTR_SIZE
810 ? bchfs_truncate(idmap, inode, iattr)
811 : bch2_setattr_nonsize(idmap, inode, iattr);
812}
813
814static int bch2_tmpfile(struct mnt_idmap *idmap,
815 struct inode *vdir, struct file *file, umode_t mode)
816{
817 struct bch_inode_info *inode =
818 __bch2_create(idmap, to_bch_ei(vdir),
819 file->f_path.dentry, mode, 0,
820 (subvol_inum) { 0 }, BCH_CREATE_TMPFILE);
821
822 if (IS_ERR(inode))
823 return bch2_err_class(PTR_ERR(inode));
824
825 d_mark_tmpfile(file, &inode->v);
826 d_instantiate(file->f_path.dentry, &inode->v);
827 return finish_open_simple(file, 0);
828}
829
830static int bch2_fill_extent(struct bch_fs *c,
831 struct fiemap_extent_info *info,
832 struct bkey_s_c k, unsigned flags)
833{
834 if (bkey_extent_is_direct_data(k.k)) {
835 struct bkey_ptrs_c ptrs = bch2_bkey_ptrs_c(k);
836 const union bch_extent_entry *entry;
837 struct extent_ptr_decoded p;
838 int ret;
839
840 if (k.k->type == KEY_TYPE_reflink_v)
841 flags |= FIEMAP_EXTENT_SHARED;
842
843 bkey_for_each_ptr_decode(k.k, ptrs, p, entry) {
844 int flags2 = 0;
845 u64 offset = p.ptr.offset;
846
847 if (p.ptr.unwritten)
848 flags2 |= FIEMAP_EXTENT_UNWRITTEN;
849
850 if (p.crc.compression_type)
851 flags2 |= FIEMAP_EXTENT_ENCODED;
852 else
853 offset += p.crc.offset;
854
855 if ((offset & (block_sectors(c) - 1)) ||
856 (k.k->size & (block_sectors(c) - 1)))
857 flags2 |= FIEMAP_EXTENT_NOT_ALIGNED;
858
859 ret = fiemap_fill_next_extent(info,
860 bkey_start_offset(k.k) << 9,
861 offset << 9,
862 k.k->size << 9, flags|flags2);
863 if (ret)
864 return ret;
865 }
866
867 return 0;
868 } else if (bkey_extent_is_inline_data(k.k)) {
869 return fiemap_fill_next_extent(info,
870 bkey_start_offset(k.k) << 9,
871 0, k.k->size << 9,
872 flags|
873 FIEMAP_EXTENT_DATA_INLINE);
874 } else if (k.k->type == KEY_TYPE_reservation) {
875 return fiemap_fill_next_extent(info,
876 bkey_start_offset(k.k) << 9,
877 0, k.k->size << 9,
878 flags|
879 FIEMAP_EXTENT_DELALLOC|
880 FIEMAP_EXTENT_UNWRITTEN);
881 } else {
882 BUG();
883 }
884}
885
886static int bch2_fiemap(struct inode *vinode, struct fiemap_extent_info *info,
887 u64 start, u64 len)
888{
889 struct bch_fs *c = vinode->i_sb->s_fs_info;
890 struct bch_inode_info *ei = to_bch_ei(vinode);
891 struct btree_trans *trans;
892 struct btree_iter iter;
893 struct bkey_s_c k;
894 struct bkey_buf cur, prev;
895 struct bpos end = POS(ei->v.i_ino, (start + len) >> 9);
896 unsigned offset_into_extent, sectors;
897 bool have_extent = false;
898 u32 snapshot;
899 int ret = 0;
900
901 ret = fiemap_prep(&ei->v, info, start, &len, FIEMAP_FLAG_SYNC);
902 if (ret)
903 return ret;
904
905 if (start + len < start)
906 return -EINVAL;
907
908 start >>= 9;
909
910 bch2_bkey_buf_init(&cur);
911 bch2_bkey_buf_init(&prev);
912 trans = bch2_trans_get(c);
913retry:
914 bch2_trans_begin(trans);
915
916 ret = bch2_subvolume_get_snapshot(trans, ei->ei_subvol, &snapshot);
917 if (ret)
918 goto err;
919
920 bch2_trans_iter_init(trans, &iter, BTREE_ID_extents,
921 SPOS(ei->v.i_ino, start, snapshot), 0);
922
923 while (!(ret = btree_trans_too_many_iters(trans)) &&
924 (k = bch2_btree_iter_peek_upto(&iter, end)).k &&
925 !(ret = bkey_err(k))) {
926 enum btree_id data_btree = BTREE_ID_extents;
927
928 if (!bkey_extent_is_data(k.k) &&
929 k.k->type != KEY_TYPE_reservation) {
930 bch2_btree_iter_advance(&iter);
931 continue;
932 }
933
934 offset_into_extent = iter.pos.offset -
935 bkey_start_offset(k.k);
936 sectors = k.k->size - offset_into_extent;
937
938 bch2_bkey_buf_reassemble(&cur, c, k);
939
940 ret = bch2_read_indirect_extent(trans, &data_btree,
941 &offset_into_extent, &cur);
942 if (ret)
943 break;
944
945 k = bkey_i_to_s_c(cur.k);
946 bch2_bkey_buf_realloc(&prev, c, k.k->u64s);
947
948 sectors = min(sectors, k.k->size - offset_into_extent);
949
950 bch2_cut_front(POS(k.k->p.inode,
951 bkey_start_offset(k.k) +
952 offset_into_extent),
953 cur.k);
954 bch2_key_resize(&cur.k->k, sectors);
955 cur.k->k.p = iter.pos;
956 cur.k->k.p.offset += cur.k->k.size;
957
958 if (have_extent) {
959 bch2_trans_unlock(trans);
960 ret = bch2_fill_extent(c, info,
961 bkey_i_to_s_c(prev.k), 0);
962 if (ret)
963 break;
964 }
965
966 bkey_copy(prev.k, cur.k);
967 have_extent = true;
968
969 bch2_btree_iter_set_pos(&iter,
970 POS(iter.pos.inode, iter.pos.offset + sectors));
971 }
972 start = iter.pos.offset;
973 bch2_trans_iter_exit(trans, &iter);
974err:
975 if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
976 goto retry;
977
978 if (!ret && have_extent) {
979 bch2_trans_unlock(trans);
980 ret = bch2_fill_extent(c, info, bkey_i_to_s_c(prev.k),
981 FIEMAP_EXTENT_LAST);
982 }
983
984 bch2_trans_put(trans);
985 bch2_bkey_buf_exit(&cur, c);
986 bch2_bkey_buf_exit(&prev, c);
987 return ret < 0 ? ret : 0;
988}
989
990static const struct vm_operations_struct bch_vm_ops = {
991 .fault = bch2_page_fault,
992 .map_pages = filemap_map_pages,
993 .page_mkwrite = bch2_page_mkwrite,
994};
995
996static int bch2_mmap(struct file *file, struct vm_area_struct *vma)
997{
998 file_accessed(file);
999
1000 vma->vm_ops = &bch_vm_ops;
1001 return 0;
1002}
1003
1004/* Directories: */
1005
1006static loff_t bch2_dir_llseek(struct file *file, loff_t offset, int whence)
1007{
1008 return generic_file_llseek_size(file, offset, whence,
1009 S64_MAX, S64_MAX);
1010}
1011
1012static int bch2_vfs_readdir(struct file *file, struct dir_context *ctx)
1013{
1014 struct bch_inode_info *inode = file_bch_inode(file);
1015 struct bch_fs *c = inode->v.i_sb->s_fs_info;
1016
1017 if (!dir_emit_dots(file, ctx))
1018 return 0;
1019
1020 int ret = bch2_readdir(c, inode_inum(inode), ctx);
1021
1022 bch_err_fn(c, ret);
1023 return bch2_err_class(ret);
1024}
1025
1026static int bch2_open(struct inode *vinode, struct file *file)
1027{
1028 if (file->f_flags & (O_WRONLY|O_RDWR)) {
1029 struct bch_inode_info *inode = to_bch_ei(vinode);
1030 struct bch_fs *c = inode->v.i_sb->s_fs_info;
1031
1032 int ret = bch2_subvol_is_ro(c, inode->ei_subvol);
1033 if (ret)
1034 return ret;
1035 }
1036
1037 return generic_file_open(vinode, file);
1038}
1039
1040static const struct file_operations bch_file_operations = {
1041 .open = bch2_open,
1042 .llseek = bch2_llseek,
1043 .read_iter = bch2_read_iter,
1044 .write_iter = bch2_write_iter,
1045 .mmap = bch2_mmap,
1046 .fsync = bch2_fsync,
1047 .splice_read = filemap_splice_read,
1048 .splice_write = iter_file_splice_write,
1049 .fallocate = bch2_fallocate_dispatch,
1050 .unlocked_ioctl = bch2_fs_file_ioctl,
1051#ifdef CONFIG_COMPAT
1052 .compat_ioctl = bch2_compat_fs_ioctl,
1053#endif
1054 .remap_file_range = bch2_remap_file_range,
1055};
1056
1057static const struct inode_operations bch_file_inode_operations = {
1058 .getattr = bch2_getattr,
1059 .setattr = bch2_setattr,
1060 .fiemap = bch2_fiemap,
1061 .listxattr = bch2_xattr_list,
1062#ifdef CONFIG_BCACHEFS_POSIX_ACL
1063 .get_acl = bch2_get_acl,
1064 .set_acl = bch2_set_acl,
1065#endif
1066};
1067
1068static const struct inode_operations bch_dir_inode_operations = {
1069 .lookup = bch2_lookup,
1070 .create = bch2_create,
1071 .link = bch2_link,
1072 .unlink = bch2_unlink,
1073 .symlink = bch2_symlink,
1074 .mkdir = bch2_mkdir,
1075 .rmdir = bch2_unlink,
1076 .mknod = bch2_mknod,
1077 .rename = bch2_rename2,
1078 .getattr = bch2_getattr,
1079 .setattr = bch2_setattr,
1080 .tmpfile = bch2_tmpfile,
1081 .listxattr = bch2_xattr_list,
1082#ifdef CONFIG_BCACHEFS_POSIX_ACL
1083 .get_acl = bch2_get_acl,
1084 .set_acl = bch2_set_acl,
1085#endif
1086};
1087
1088static const struct file_operations bch_dir_file_operations = {
1089 .llseek = bch2_dir_llseek,
1090 .read = generic_read_dir,
1091 .iterate_shared = bch2_vfs_readdir,
1092 .fsync = bch2_fsync,
1093 .unlocked_ioctl = bch2_fs_file_ioctl,
1094#ifdef CONFIG_COMPAT
1095 .compat_ioctl = bch2_compat_fs_ioctl,
1096#endif
1097};
1098
1099static const struct inode_operations bch_symlink_inode_operations = {
1100 .get_link = page_get_link,
1101 .getattr = bch2_getattr,
1102 .setattr = bch2_setattr,
1103 .listxattr = bch2_xattr_list,
1104#ifdef CONFIG_BCACHEFS_POSIX_ACL
1105 .get_acl = bch2_get_acl,
1106 .set_acl = bch2_set_acl,
1107#endif
1108};
1109
1110static const struct inode_operations bch_special_inode_operations = {
1111 .getattr = bch2_getattr,
1112 .setattr = bch2_setattr,
1113 .listxattr = bch2_xattr_list,
1114#ifdef CONFIG_BCACHEFS_POSIX_ACL
1115 .get_acl = bch2_get_acl,
1116 .set_acl = bch2_set_acl,
1117#endif
1118};
1119
1120static const struct address_space_operations bch_address_space_operations = {
1121 .read_folio = bch2_read_folio,
1122 .writepages = bch2_writepages,
1123 .readahead = bch2_readahead,
1124 .dirty_folio = filemap_dirty_folio,
1125 .write_begin = bch2_write_begin,
1126 .write_end = bch2_write_end,
1127 .invalidate_folio = bch2_invalidate_folio,
1128 .release_folio = bch2_release_folio,
1129 .direct_IO = noop_direct_IO,
1130#ifdef CONFIG_MIGRATION
1131 .migrate_folio = filemap_migrate_folio,
1132#endif
1133 .error_remove_folio = generic_error_remove_folio,
1134};
1135
1136struct bcachefs_fid {
1137 u64 inum;
1138 u32 subvol;
1139 u32 gen;
1140} __packed;
1141
1142struct bcachefs_fid_with_parent {
1143 struct bcachefs_fid fid;
1144 struct bcachefs_fid dir;
1145} __packed;
1146
1147static int bcachefs_fid_valid(int fh_len, int fh_type)
1148{
1149 switch (fh_type) {
1150 case FILEID_BCACHEFS_WITHOUT_PARENT:
1151 return fh_len == sizeof(struct bcachefs_fid) / sizeof(u32);
1152 case FILEID_BCACHEFS_WITH_PARENT:
1153 return fh_len == sizeof(struct bcachefs_fid_with_parent) / sizeof(u32);
1154 default:
1155 return false;
1156 }
1157}
1158
1159static struct bcachefs_fid bch2_inode_to_fid(struct bch_inode_info *inode)
1160{
1161 return (struct bcachefs_fid) {
1162 .inum = inode->ei_inode.bi_inum,
1163 .subvol = inode->ei_subvol,
1164 .gen = inode->ei_inode.bi_generation,
1165 };
1166}
1167
1168static int bch2_encode_fh(struct inode *vinode, u32 *fh, int *len,
1169 struct inode *vdir)
1170{
1171 struct bch_inode_info *inode = to_bch_ei(vinode);
1172 struct bch_inode_info *dir = to_bch_ei(vdir);
1173 int min_len;
1174
1175 if (!S_ISDIR(inode->v.i_mode) && dir) {
1176 struct bcachefs_fid_with_parent *fid = (void *) fh;
1177
1178 min_len = sizeof(*fid) / sizeof(u32);
1179 if (*len < min_len) {
1180 *len = min_len;
1181 return FILEID_INVALID;
1182 }
1183
1184 fid->fid = bch2_inode_to_fid(inode);
1185 fid->dir = bch2_inode_to_fid(dir);
1186
1187 *len = min_len;
1188 return FILEID_BCACHEFS_WITH_PARENT;
1189 } else {
1190 struct bcachefs_fid *fid = (void *) fh;
1191
1192 min_len = sizeof(*fid) / sizeof(u32);
1193 if (*len < min_len) {
1194 *len = min_len;
1195 return FILEID_INVALID;
1196 }
1197 *fid = bch2_inode_to_fid(inode);
1198
1199 *len = min_len;
1200 return FILEID_BCACHEFS_WITHOUT_PARENT;
1201 }
1202}
1203
1204static struct inode *bch2_nfs_get_inode(struct super_block *sb,
1205 struct bcachefs_fid fid)
1206{
1207 struct bch_fs *c = sb->s_fs_info;
1208 struct inode *vinode = bch2_vfs_inode_get(c, (subvol_inum) {
1209 .subvol = fid.subvol,
1210 .inum = fid.inum,
1211 });
1212 if (!IS_ERR(vinode) && vinode->i_generation != fid.gen) {
1213 iput(vinode);
1214 vinode = ERR_PTR(-ESTALE);
1215 }
1216 return vinode;
1217}
1218
1219static struct dentry *bch2_fh_to_dentry(struct super_block *sb, struct fid *_fid,
1220 int fh_len, int fh_type)
1221{
1222 struct bcachefs_fid *fid = (void *) _fid;
1223
1224 if (!bcachefs_fid_valid(fh_len, fh_type))
1225 return NULL;
1226
1227 return d_obtain_alias(bch2_nfs_get_inode(sb, *fid));
1228}
1229
1230static struct dentry *bch2_fh_to_parent(struct super_block *sb, struct fid *_fid,
1231 int fh_len, int fh_type)
1232{
1233 struct bcachefs_fid_with_parent *fid = (void *) _fid;
1234
1235 if (!bcachefs_fid_valid(fh_len, fh_type) ||
1236 fh_type != FILEID_BCACHEFS_WITH_PARENT)
1237 return NULL;
1238
1239 return d_obtain_alias(bch2_nfs_get_inode(sb, fid->dir));
1240}
1241
1242static struct dentry *bch2_get_parent(struct dentry *child)
1243{
1244 struct bch_inode_info *inode = to_bch_ei(child->d_inode);
1245 struct bch_fs *c = inode->v.i_sb->s_fs_info;
1246 subvol_inum parent_inum = {
1247 .subvol = inode->ei_inode.bi_parent_subvol ?:
1248 inode->ei_subvol,
1249 .inum = inode->ei_inode.bi_dir,
1250 };
1251
1252 return d_obtain_alias(bch2_vfs_inode_get(c, parent_inum));
1253}
1254
1255static int bch2_get_name(struct dentry *parent, char *name, struct dentry *child)
1256{
1257 struct bch_inode_info *inode = to_bch_ei(child->d_inode);
1258 struct bch_inode_info *dir = to_bch_ei(parent->d_inode);
1259 struct bch_fs *c = inode->v.i_sb->s_fs_info;
1260 struct btree_trans *trans;
1261 struct btree_iter iter1;
1262 struct btree_iter iter2;
1263 struct bkey_s_c k;
1264 struct bkey_s_c_dirent d;
1265 struct bch_inode_unpacked inode_u;
1266 subvol_inum target;
1267 u32 snapshot;
1268 struct qstr dirent_name;
1269 unsigned name_len = 0;
1270 int ret;
1271
1272 if (!S_ISDIR(dir->v.i_mode))
1273 return -EINVAL;
1274
1275 trans = bch2_trans_get(c);
1276
1277 bch2_trans_iter_init(trans, &iter1, BTREE_ID_dirents,
1278 POS(dir->ei_inode.bi_inum, 0), 0);
1279 bch2_trans_iter_init(trans, &iter2, BTREE_ID_dirents,
1280 POS(dir->ei_inode.bi_inum, 0), 0);
1281retry:
1282 bch2_trans_begin(trans);
1283
1284 ret = bch2_subvolume_get_snapshot(trans, dir->ei_subvol, &snapshot);
1285 if (ret)
1286 goto err;
1287
1288 bch2_btree_iter_set_snapshot(&iter1, snapshot);
1289 bch2_btree_iter_set_snapshot(&iter2, snapshot);
1290
1291 ret = bch2_inode_find_by_inum_trans(trans, inode_inum(inode), &inode_u);
1292 if (ret)
1293 goto err;
1294
1295 if (inode_u.bi_dir == dir->ei_inode.bi_inum) {
1296 bch2_btree_iter_set_pos(&iter1, POS(inode_u.bi_dir, inode_u.bi_dir_offset));
1297
1298 k = bch2_btree_iter_peek_slot(&iter1);
1299 ret = bkey_err(k);
1300 if (ret)
1301 goto err;
1302
1303 if (k.k->type != KEY_TYPE_dirent) {
1304 ret = -BCH_ERR_ENOENT_dirent_doesnt_match_inode;
1305 goto err;
1306 }
1307
1308 d = bkey_s_c_to_dirent(k);
1309 ret = bch2_dirent_read_target(trans, inode_inum(dir), d, &target);
1310 if (ret > 0)
1311 ret = -BCH_ERR_ENOENT_dirent_doesnt_match_inode;
1312 if (ret)
1313 goto err;
1314
1315 if (target.subvol == inode->ei_subvol &&
1316 target.inum == inode->ei_inode.bi_inum)
1317 goto found;
1318 } else {
1319 /*
1320 * File with multiple hardlinks and our backref is to the wrong
1321 * directory - linear search:
1322 */
1323 for_each_btree_key_continue_norestart(iter2, 0, k, ret) {
1324 if (k.k->p.inode > dir->ei_inode.bi_inum)
1325 break;
1326
1327 if (k.k->type != KEY_TYPE_dirent)
1328 continue;
1329
1330 d = bkey_s_c_to_dirent(k);
1331 ret = bch2_dirent_read_target(trans, inode_inum(dir), d, &target);
1332 if (ret < 0)
1333 break;
1334 if (ret)
1335 continue;
1336
1337 if (target.subvol == inode->ei_subvol &&
1338 target.inum == inode->ei_inode.bi_inum)
1339 goto found;
1340 }
1341 }
1342
1343 ret = -ENOENT;
1344 goto err;
1345found:
1346 dirent_name = bch2_dirent_get_name(d);
1347
1348 name_len = min_t(unsigned, dirent_name.len, NAME_MAX);
1349 memcpy(name, dirent_name.name, name_len);
1350 name[name_len] = '\0';
1351err:
1352 if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
1353 goto retry;
1354
1355 bch2_trans_iter_exit(trans, &iter1);
1356 bch2_trans_iter_exit(trans, &iter2);
1357 bch2_trans_put(trans);
1358
1359 return ret;
1360}
1361
1362static const struct export_operations bch_export_ops = {
1363 .encode_fh = bch2_encode_fh,
1364 .fh_to_dentry = bch2_fh_to_dentry,
1365 .fh_to_parent = bch2_fh_to_parent,
1366 .get_parent = bch2_get_parent,
1367 .get_name = bch2_get_name,
1368};
1369
1370static void bch2_vfs_inode_init(struct btree_trans *trans, subvol_inum inum,
1371 struct bch_inode_info *inode,
1372 struct bch_inode_unpacked *bi,
1373 struct bch_subvolume *subvol)
1374{
1375 bch2_inode_update_after_write(trans, inode, bi, ~0);
1376
1377 if (BCH_SUBVOLUME_SNAP(subvol))
1378 set_bit(EI_INODE_SNAPSHOT, &inode->ei_flags);
1379 else
1380 clear_bit(EI_INODE_SNAPSHOT, &inode->ei_flags);
1381
1382 inode->v.i_blocks = bi->bi_sectors;
1383 inode->v.i_ino = bi->bi_inum;
1384 inode->v.i_rdev = bi->bi_dev;
1385 inode->v.i_generation = bi->bi_generation;
1386 inode->v.i_size = bi->bi_size;
1387
1388 inode->ei_flags = 0;
1389 inode->ei_quota_reserved = 0;
1390 inode->ei_qid = bch_qid(bi);
1391 inode->ei_subvol = inum.subvol;
1392
1393 inode->v.i_mapping->a_ops = &bch_address_space_operations;
1394
1395 switch (inode->v.i_mode & S_IFMT) {
1396 case S_IFREG:
1397 inode->v.i_op = &bch_file_inode_operations;
1398 inode->v.i_fop = &bch_file_operations;
1399 break;
1400 case S_IFDIR:
1401 inode->v.i_op = &bch_dir_inode_operations;
1402 inode->v.i_fop = &bch_dir_file_operations;
1403 break;
1404 case S_IFLNK:
1405 inode_nohighmem(&inode->v);
1406 inode->v.i_op = &bch_symlink_inode_operations;
1407 break;
1408 default:
1409 init_special_inode(&inode->v, inode->v.i_mode, inode->v.i_rdev);
1410 inode->v.i_op = &bch_special_inode_operations;
1411 break;
1412 }
1413
1414 mapping_set_large_folios(inode->v.i_mapping);
1415}
1416
1417static struct inode *bch2_alloc_inode(struct super_block *sb)
1418{
1419 struct bch_inode_info *inode;
1420
1421 inode = kmem_cache_alloc(bch2_inode_cache, GFP_NOFS);
1422 if (!inode)
1423 return NULL;
1424
1425 inode_init_once(&inode->v);
1426 mutex_init(&inode->ei_update_lock);
1427 two_state_lock_init(&inode->ei_pagecache_lock);
1428 INIT_LIST_HEAD(&inode->ei_vfs_inode_list);
1429 mutex_init(&inode->ei_quota_lock);
1430
1431 return &inode->v;
1432}
1433
1434static void bch2_i_callback(struct rcu_head *head)
1435{
1436 struct inode *vinode = container_of(head, struct inode, i_rcu);
1437 struct bch_inode_info *inode = to_bch_ei(vinode);
1438
1439 kmem_cache_free(bch2_inode_cache, inode);
1440}
1441
1442static void bch2_destroy_inode(struct inode *vinode)
1443{
1444 call_rcu(&vinode->i_rcu, bch2_i_callback);
1445}
1446
1447static int inode_update_times_fn(struct btree_trans *trans,
1448 struct bch_inode_info *inode,
1449 struct bch_inode_unpacked *bi,
1450 void *p)
1451{
1452 struct bch_fs *c = inode->v.i_sb->s_fs_info;
1453
1454 bi->bi_atime = timespec_to_bch2_time(c, inode_get_atime(&inode->v));
1455 bi->bi_mtime = timespec_to_bch2_time(c, inode_get_mtime(&inode->v));
1456 bi->bi_ctime = timespec_to_bch2_time(c, inode_get_ctime(&inode->v));
1457
1458 return 0;
1459}
1460
1461static int bch2_vfs_write_inode(struct inode *vinode,
1462 struct writeback_control *wbc)
1463{
1464 struct bch_fs *c = vinode->i_sb->s_fs_info;
1465 struct bch_inode_info *inode = to_bch_ei(vinode);
1466 int ret;
1467
1468 mutex_lock(&inode->ei_update_lock);
1469 ret = bch2_write_inode(c, inode, inode_update_times_fn, NULL,
1470 ATTR_ATIME|ATTR_MTIME|ATTR_CTIME);
1471 mutex_unlock(&inode->ei_update_lock);
1472
1473 return bch2_err_class(ret);
1474}
1475
1476static void bch2_evict_inode(struct inode *vinode)
1477{
1478 struct bch_fs *c = vinode->i_sb->s_fs_info;
1479 struct bch_inode_info *inode = to_bch_ei(vinode);
1480
1481 truncate_inode_pages_final(&inode->v.i_data);
1482
1483 clear_inode(&inode->v);
1484
1485 BUG_ON(!is_bad_inode(&inode->v) && inode->ei_quota_reserved);
1486
1487 if (!inode->v.i_nlink && !is_bad_inode(&inode->v)) {
1488 bch2_quota_acct(c, inode->ei_qid, Q_SPC, -((s64) inode->v.i_blocks),
1489 KEY_TYPE_QUOTA_WARN);
1490 bch2_quota_acct(c, inode->ei_qid, Q_INO, -1,
1491 KEY_TYPE_QUOTA_WARN);
1492 bch2_inode_rm(c, inode_inum(inode));
1493 }
1494
1495 mutex_lock(&c->vfs_inodes_lock);
1496 list_del_init(&inode->ei_vfs_inode_list);
1497 mutex_unlock(&c->vfs_inodes_lock);
1498}
1499
1500void bch2_evict_subvolume_inodes(struct bch_fs *c, snapshot_id_list *s)
1501{
1502 struct bch_inode_info *inode;
1503 DARRAY(struct bch_inode_info *) grabbed;
1504 bool clean_pass = false, this_pass_clean;
1505
1506 /*
1507 * Initially, we scan for inodes without I_DONTCACHE, then mark them to
1508 * be pruned with d_mark_dontcache().
1509 *
1510 * Once we've had a clean pass where we didn't find any inodes without
1511 * I_DONTCACHE, we wait for them to be freed:
1512 */
1513
1514 darray_init(&grabbed);
1515 darray_make_room(&grabbed, 1024);
1516again:
1517 cond_resched();
1518 this_pass_clean = true;
1519
1520 mutex_lock(&c->vfs_inodes_lock);
1521 list_for_each_entry(inode, &c->vfs_inodes_list, ei_vfs_inode_list) {
1522 if (!snapshot_list_has_id(s, inode->ei_subvol))
1523 continue;
1524
1525 if (!(inode->v.i_state & I_DONTCACHE) &&
1526 !(inode->v.i_state & I_FREEING) &&
1527 igrab(&inode->v)) {
1528 this_pass_clean = false;
1529
1530 if (darray_push_gfp(&grabbed, inode, GFP_ATOMIC|__GFP_NOWARN)) {
1531 iput(&inode->v);
1532 break;
1533 }
1534 } else if (clean_pass && this_pass_clean) {
1535 wait_queue_head_t *wq = bit_waitqueue(&inode->v.i_state, __I_NEW);
1536 DEFINE_WAIT_BIT(wait, &inode->v.i_state, __I_NEW);
1537
1538 prepare_to_wait(wq, &wait.wq_entry, TASK_UNINTERRUPTIBLE);
1539 mutex_unlock(&c->vfs_inodes_lock);
1540
1541 schedule();
1542 finish_wait(wq, &wait.wq_entry);
1543 goto again;
1544 }
1545 }
1546 mutex_unlock(&c->vfs_inodes_lock);
1547
1548 darray_for_each(grabbed, i) {
1549 inode = *i;
1550 d_mark_dontcache(&inode->v);
1551 d_prune_aliases(&inode->v);
1552 iput(&inode->v);
1553 }
1554 grabbed.nr = 0;
1555
1556 if (!clean_pass || !this_pass_clean) {
1557 clean_pass = this_pass_clean;
1558 goto again;
1559 }
1560
1561 darray_exit(&grabbed);
1562}
1563
1564static int bch2_statfs(struct dentry *dentry, struct kstatfs *buf)
1565{
1566 struct super_block *sb = dentry->d_sb;
1567 struct bch_fs *c = sb->s_fs_info;
1568 struct bch_fs_usage_short usage = bch2_fs_usage_read_short(c);
1569 unsigned shift = sb->s_blocksize_bits - 9;
1570 /*
1571 * this assumes inodes take up 64 bytes, which is a decent average
1572 * number:
1573 */
1574 u64 avail_inodes = ((usage.capacity - usage.used) << 3);
1575 u64 fsid;
1576
1577 buf->f_type = BCACHEFS_STATFS_MAGIC;
1578 buf->f_bsize = sb->s_blocksize;
1579 buf->f_blocks = usage.capacity >> shift;
1580 buf->f_bfree = usage.free >> shift;
1581 buf->f_bavail = avail_factor(usage.free) >> shift;
1582
1583 buf->f_files = usage.nr_inodes + avail_inodes;
1584 buf->f_ffree = avail_inodes;
1585
1586 fsid = le64_to_cpup((void *) c->sb.user_uuid.b) ^
1587 le64_to_cpup((void *) c->sb.user_uuid.b + sizeof(u64));
1588 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
1589 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
1590 buf->f_namelen = BCH_NAME_MAX;
1591
1592 return 0;
1593}
1594
1595static int bch2_sync_fs(struct super_block *sb, int wait)
1596{
1597 struct bch_fs *c = sb->s_fs_info;
1598 int ret;
1599
1600 if (c->opts.journal_flush_disabled)
1601 return 0;
1602
1603 if (!wait) {
1604 bch2_journal_flush_async(&c->journal, NULL);
1605 return 0;
1606 }
1607
1608 ret = bch2_journal_flush(&c->journal);
1609 return bch2_err_class(ret);
1610}
1611
1612static struct bch_fs *bch2_path_to_fs(const char *path)
1613{
1614 struct bch_fs *c;
1615 dev_t dev;
1616 int ret;
1617
1618 ret = lookup_bdev(path, &dev);
1619 if (ret)
1620 return ERR_PTR(ret);
1621
1622 c = bch2_dev_to_fs(dev);
1623 if (c)
1624 closure_put(&c->cl);
1625 return c ?: ERR_PTR(-ENOENT);
1626}
1627
1628static int bch2_remount(struct super_block *sb, int *flags, char *data)
1629{
1630 struct bch_fs *c = sb->s_fs_info;
1631 struct bch_opts opts = bch2_opts_empty();
1632 int ret;
1633
1634 ret = bch2_parse_mount_opts(c, &opts, data);
1635 if (ret)
1636 goto err;
1637
1638 opt_set(opts, read_only, (*flags & SB_RDONLY) != 0);
1639
1640 if (opts.read_only != c->opts.read_only) {
1641 down_write(&c->state_lock);
1642
1643 if (opts.read_only) {
1644 bch2_fs_read_only(c);
1645
1646 sb->s_flags |= SB_RDONLY;
1647 } else {
1648 ret = bch2_fs_read_write(c);
1649 if (ret) {
1650 bch_err(c, "error going rw: %i", ret);
1651 up_write(&c->state_lock);
1652 ret = -EINVAL;
1653 goto err;
1654 }
1655
1656 sb->s_flags &= ~SB_RDONLY;
1657 }
1658
1659 c->opts.read_only = opts.read_only;
1660
1661 up_write(&c->state_lock);
1662 }
1663
1664 if (opt_defined(opts, errors))
1665 c->opts.errors = opts.errors;
1666err:
1667 return bch2_err_class(ret);
1668}
1669
1670static int bch2_show_devname(struct seq_file *seq, struct dentry *root)
1671{
1672 struct bch_fs *c = root->d_sb->s_fs_info;
1673 bool first = true;
1674
1675 for_each_online_member(c, ca) {
1676 if (!first)
1677 seq_putc(seq, ':');
1678 first = false;
1679 seq_puts(seq, ca->disk_sb.sb_name);
1680 }
1681
1682 return 0;
1683}
1684
1685static int bch2_show_options(struct seq_file *seq, struct dentry *root)
1686{
1687 struct bch_fs *c = root->d_sb->s_fs_info;
1688 enum bch_opt_id i;
1689 struct printbuf buf = PRINTBUF;
1690 int ret = 0;
1691
1692 for (i = 0; i < bch2_opts_nr; i++) {
1693 const struct bch_option *opt = &bch2_opt_table[i];
1694 u64 v = bch2_opt_get_by_id(&c->opts, i);
1695
1696 if (!(opt->flags & OPT_MOUNT))
1697 continue;
1698
1699 if (v == bch2_opt_get_by_id(&bch2_opts_default, i))
1700 continue;
1701
1702 printbuf_reset(&buf);
1703 bch2_opt_to_text(&buf, c, c->disk_sb.sb, opt, v,
1704 OPT_SHOW_MOUNT_STYLE);
1705 seq_putc(seq, ',');
1706 seq_puts(seq, buf.buf);
1707 }
1708
1709 if (buf.allocation_failure)
1710 ret = -ENOMEM;
1711 printbuf_exit(&buf);
1712 return ret;
1713}
1714
1715static void bch2_put_super(struct super_block *sb)
1716{
1717 struct bch_fs *c = sb->s_fs_info;
1718
1719 __bch2_fs_stop(c);
1720}
1721
1722/*
1723 * bcachefs doesn't currently integrate intwrite freeze protection but the
1724 * internal write references serve the same purpose. Therefore reuse the
1725 * read-only transition code to perform the quiesce. The caveat is that we don't
1726 * currently have the ability to block tasks that want a write reference while
1727 * the superblock is frozen. This is fine for now, but we should either add
1728 * blocking support or find a way to integrate sb_start_intwrite() and friends.
1729 */
1730static int bch2_freeze(struct super_block *sb)
1731{
1732 struct bch_fs *c = sb->s_fs_info;
1733
1734 down_write(&c->state_lock);
1735 bch2_fs_read_only(c);
1736 up_write(&c->state_lock);
1737 return 0;
1738}
1739
1740static int bch2_unfreeze(struct super_block *sb)
1741{
1742 struct bch_fs *c = sb->s_fs_info;
1743 int ret;
1744
1745 if (test_bit(BCH_FS_emergency_ro, &c->flags))
1746 return 0;
1747
1748 down_write(&c->state_lock);
1749 ret = bch2_fs_read_write(c);
1750 up_write(&c->state_lock);
1751 return ret;
1752}
1753
1754static const struct super_operations bch_super_operations = {
1755 .alloc_inode = bch2_alloc_inode,
1756 .destroy_inode = bch2_destroy_inode,
1757 .write_inode = bch2_vfs_write_inode,
1758 .evict_inode = bch2_evict_inode,
1759 .sync_fs = bch2_sync_fs,
1760 .statfs = bch2_statfs,
1761 .show_devname = bch2_show_devname,
1762 .show_options = bch2_show_options,
1763 .remount_fs = bch2_remount,
1764 .put_super = bch2_put_super,
1765 .freeze_fs = bch2_freeze,
1766 .unfreeze_fs = bch2_unfreeze,
1767};
1768
1769static int bch2_set_super(struct super_block *s, void *data)
1770{
1771 s->s_fs_info = data;
1772 return 0;
1773}
1774
1775static int bch2_noset_super(struct super_block *s, void *data)
1776{
1777 return -EBUSY;
1778}
1779
1780typedef DARRAY(struct bch_fs *) darray_fs;
1781
1782static int bch2_test_super(struct super_block *s, void *data)
1783{
1784 struct bch_fs *c = s->s_fs_info;
1785 darray_fs *d = data;
1786
1787 if (!c)
1788 return false;
1789
1790 darray_for_each(*d, i)
1791 if (c != *i)
1792 return false;
1793 return true;
1794}
1795
1796static struct dentry *bch2_mount(struct file_system_type *fs_type,
1797 int flags, const char *dev_name, void *data)
1798{
1799 struct bch_fs *c;
1800 struct super_block *sb;
1801 struct inode *vinode;
1802 struct bch_opts opts = bch2_opts_empty();
1803 int ret;
1804
1805 opt_set(opts, read_only, (flags & SB_RDONLY) != 0);
1806
1807 ret = bch2_parse_mount_opts(NULL, &opts, data);
1808 if (ret)
1809 return ERR_PTR(ret);
1810
1811 if (!dev_name || strlen(dev_name) == 0)
1812 return ERR_PTR(-EINVAL);
1813
1814 darray_str devs;
1815 ret = bch2_split_devs(dev_name, &devs);
1816 if (ret)
1817 return ERR_PTR(ret);
1818
1819 darray_fs devs_to_fs = {};
1820 darray_for_each(devs, i) {
1821 ret = darray_push(&devs_to_fs, bch2_path_to_fs(*i));
1822 if (ret) {
1823 sb = ERR_PTR(ret);
1824 goto got_sb;
1825 }
1826 }
1827
1828 sb = sget(fs_type, bch2_test_super, bch2_noset_super, flags|SB_NOSEC, &devs_to_fs);
1829 if (!IS_ERR(sb))
1830 goto got_sb;
1831
1832 c = bch2_fs_open(devs.data, devs.nr, opts);
1833 if (IS_ERR(c)) {
1834 sb = ERR_CAST(c);
1835 goto got_sb;
1836 }
1837
1838 /* Some options can't be parsed until after the fs is started: */
1839 ret = bch2_parse_mount_opts(c, &opts, data);
1840 if (ret) {
1841 bch2_fs_stop(c);
1842 sb = ERR_PTR(ret);
1843 goto got_sb;
1844 }
1845
1846 bch2_opts_apply(&c->opts, opts);
1847
1848 sb = sget(fs_type, NULL, bch2_set_super, flags|SB_NOSEC, c);
1849 if (IS_ERR(sb))
1850 bch2_fs_stop(c);
1851got_sb:
1852 darray_exit(&devs_to_fs);
1853 bch2_darray_str_exit(&devs);
1854
1855 if (IS_ERR(sb)) {
1856 ret = PTR_ERR(sb);
1857 ret = bch2_err_class(ret);
1858 return ERR_PTR(ret);
1859 }
1860
1861 c = sb->s_fs_info;
1862
1863 if (sb->s_root) {
1864 if ((flags ^ sb->s_flags) & SB_RDONLY) {
1865 ret = -EBUSY;
1866 goto err_put_super;
1867 }
1868 goto out;
1869 }
1870
1871 sb->s_blocksize = block_bytes(c);
1872 sb->s_blocksize_bits = ilog2(block_bytes(c));
1873 sb->s_maxbytes = MAX_LFS_FILESIZE;
1874 sb->s_op = &bch_super_operations;
1875 sb->s_export_op = &bch_export_ops;
1876#ifdef CONFIG_BCACHEFS_QUOTA
1877 sb->s_qcop = &bch2_quotactl_operations;
1878 sb->s_quota_types = QTYPE_MASK_USR|QTYPE_MASK_GRP|QTYPE_MASK_PRJ;
1879#endif
1880 sb->s_xattr = bch2_xattr_handlers;
1881 sb->s_magic = BCACHEFS_STATFS_MAGIC;
1882 sb->s_time_gran = c->sb.nsec_per_time_unit;
1883 sb->s_time_min = div_s64(S64_MIN, c->sb.time_units_per_sec) + 1;
1884 sb->s_time_max = div_s64(S64_MAX, c->sb.time_units_per_sec);
1885 c->vfs_sb = sb;
1886 strscpy(sb->s_id, c->name, sizeof(sb->s_id));
1887
1888 ret = super_setup_bdi(sb);
1889 if (ret)
1890 goto err_put_super;
1891
1892 sb->s_bdi->ra_pages = VM_READAHEAD_PAGES;
1893
1894 for_each_online_member(c, ca) {
1895 struct block_device *bdev = ca->disk_sb.bdev;
1896
1897 /* XXX: create an anonymous device for multi device filesystems */
1898 sb->s_bdev = bdev;
1899 sb->s_dev = bdev->bd_dev;
1900 percpu_ref_put(&ca->io_ref);
1901 break;
1902 }
1903
1904 c->dev = sb->s_dev;
1905
1906#ifdef CONFIG_BCACHEFS_POSIX_ACL
1907 if (c->opts.acl)
1908 sb->s_flags |= SB_POSIXACL;
1909#endif
1910
1911 sb->s_shrink->seeks = 0;
1912
1913 vinode = bch2_vfs_inode_get(c, BCACHEFS_ROOT_SUBVOL_INUM);
1914 ret = PTR_ERR_OR_ZERO(vinode);
1915 bch_err_msg(c, ret, "mounting: error getting root inode");
1916 if (ret)
1917 goto err_put_super;
1918
1919 sb->s_root = d_make_root(vinode);
1920 if (!sb->s_root) {
1921 bch_err(c, "error mounting: error allocating root dentry");
1922 ret = -ENOMEM;
1923 goto err_put_super;
1924 }
1925
1926 sb->s_flags |= SB_ACTIVE;
1927out:
1928 return dget(sb->s_root);
1929
1930err_put_super:
1931 deactivate_locked_super(sb);
1932 return ERR_PTR(bch2_err_class(ret));
1933}
1934
1935static void bch2_kill_sb(struct super_block *sb)
1936{
1937 struct bch_fs *c = sb->s_fs_info;
1938
1939 generic_shutdown_super(sb);
1940 bch2_fs_free(c);
1941}
1942
1943static struct file_system_type bcache_fs_type = {
1944 .owner = THIS_MODULE,
1945 .name = "bcachefs",
1946 .mount = bch2_mount,
1947 .kill_sb = bch2_kill_sb,
1948 .fs_flags = FS_REQUIRES_DEV,
1949};
1950
1951MODULE_ALIAS_FS("bcachefs");
1952
1953void bch2_vfs_exit(void)
1954{
1955 unregister_filesystem(&bcache_fs_type);
1956 kmem_cache_destroy(bch2_inode_cache);
1957}
1958
1959int __init bch2_vfs_init(void)
1960{
1961 int ret = -ENOMEM;
1962
1963 bch2_inode_cache = KMEM_CACHE(bch_inode_info, SLAB_RECLAIM_ACCOUNT);
1964 if (!bch2_inode_cache)
1965 goto err;
1966
1967 ret = register_filesystem(&bcache_fs_type);
1968 if (ret)
1969 goto err;
1970
1971 return 0;
1972err:
1973 bch2_vfs_exit();
1974 return ret;
1975}
1976
1977#endif /* NO_BCACHEFS_FS */