1 // SPDX-License-Identifier: GPL-2.0
2 #ifndef NO_BCACHEFS_FS
3
4 #include "bcachefs.h"
5 #include "chardev.h"
6 #include "dirent.h"
7 #include "fs.h"
8 #include "fs-common.h"
9 #include "fs-ioctl.h"
10 #include "quota.h"
11
12 #include <linux/compat.h>
13 #include <linux/fsnotify.h>
14 #include <linux/mount.h>
15 #include <linux/namei.h>
16 #include <linux/security.h>
17 #include <linux/writeback.h>
18
19 #define FS_IOC_GOINGDOWN _IOR('X', 125, __u32)
20 #define FSOP_GOING_FLAGS_DEFAULT 0x0 /* going down */
21 #define FSOP_GOING_FLAGS_LOGFLUSH 0x1 /* flush log but not data */
22 #define FSOP_GOING_FLAGS_NOLOGFLUSH 0x2 /* don't flush log nor data */
23
24 struct flags_set {
25 unsigned mask;
26 unsigned flags;
27
28 unsigned projid;
29
30 bool set_projinherit;
31 bool projinherit;
32 };
33
34 static int bch2_inode_flags_set(struct btree_trans *trans,
35 struct bch_inode_info *inode,
36 struct bch_inode_unpacked *bi,
37 void *p)
38 {
39 struct bch_fs *c = inode->v.i_sb->s_fs_info;
40 /*
41 * We're relying on btree locking here for exclusion with other ioctl
42 * calls - use the flags in the btree (@bi), not inode->i_flags:
43 */
44 struct flags_set *s = p;
45 unsigned newflags = s->flags;
46 unsigned oldflags = bi->bi_flags & s->mask;
47
48 if (((newflags ^ oldflags) & (BCH_INODE_append|BCH_INODE_immutable)) &&
49 !capable(CAP_LINUX_IMMUTABLE))
50 return -EPERM;
51
52 if (!S_ISREG(bi->bi_mode) &&
53 !S_ISDIR(bi->bi_mode) &&
54 (newflags & (BCH_INODE_nodump|BCH_INODE_noatime)) != newflags)
55 return -EINVAL;
56
57 if (s->set_projinherit) {
58 bi->bi_fields_set &= ~(1 << Inode_opt_project);
59 bi->bi_fields_set |= ((int) s->projinherit << Inode_opt_project);
60 }
61
62 bi->bi_flags &= ~s->mask;
63 bi->bi_flags |= newflags;
64
65 bi->bi_ctime = timespec_to_bch2_time(c, current_time(&inode->v));
66 return 0;
67 }
68
69 static int bch2_ioc_getflags(struct bch_inode_info *inode, int __user *arg)
70 {
71 unsigned flags = map_flags(bch_flags_to_uflags, inode->ei_inode.bi_flags);
72
73 return put_user(flags, arg);
74 }
75
76 static int bch2_ioc_setflags(struct bch_fs *c,
77 struct file *file,
78 struct bch_inode_info *inode,
79 void __user *arg)
80 {
81 struct flags_set s = { .mask = map_defined(bch_flags_to_uflags) };
82 unsigned uflags;
83 int ret;
84
85 if (get_user(uflags, (int __user *) arg))
86 return -EFAULT;
87
88 s.flags = map_flags_rev(bch_flags_to_uflags, uflags);
89 if (uflags)
90 return -EOPNOTSUPP;
91
92 ret = mnt_want_write_file(file);
93 if (ret)
94 return ret;
95
96 inode_lock(&inode->v);
97 if (!inode_owner_or_capable(file_mnt_idmap(file), &inode->v)) {
98 ret = -EACCES;
99 goto setflags_out;
100 }
101
102 mutex_lock(&inode->ei_update_lock);
103 ret = bch2_subvol_is_ro(c, inode->ei_subvol) ?:
104 bch2_write_inode(c, inode, bch2_inode_flags_set, &s,
105 ATTR_CTIME);
106 mutex_unlock(&inode->ei_update_lock);
107
108 setflags_out:
109 inode_unlock(&inode->v);
110 mnt_drop_write_file(file);
111 return ret;
112 }
113
114 static int bch2_ioc_fsgetxattr(struct bch_inode_info *inode,
115 struct fsxattr __user *arg)
116 {
117 struct fsxattr fa = { 0 };
118
119 fa.fsx_xflags = map_flags(bch_flags_to_xflags, inode->ei_inode.bi_flags);
120
121 if (inode->ei_inode.bi_fields_set & (1 << Inode_opt_project))
122 fa.fsx_xflags |= FS_XFLAG_PROJINHERIT;
123
124 fa.fsx_projid = inode->ei_qid.q[QTYP_PRJ];
125
126 if (copy_to_user(arg, &fa, sizeof(fa)))
127 return -EFAULT;
128
129 return 0;
130 }
131
132 static int fssetxattr_inode_update_fn(struct btree_trans *trans,
133 struct bch_inode_info *inode,
134 struct bch_inode_unpacked *bi,
135 void *p)
136 {
137 struct flags_set *s = p;
138
139 if (s->projid != bi->bi_project) {
140 bi->bi_fields_set |= 1U << Inode_opt_project;
141 bi->bi_project = s->projid;
142 }
143
144 return bch2_inode_flags_set(trans, inode, bi, p);
145 }
146
147 static int bch2_ioc_fssetxattr(struct bch_fs *c,
148 struct file *file,
149 struct bch_inode_info *inode,
150 struct fsxattr __user *arg)
151 {
152 struct flags_set s = { .mask = map_defined(bch_flags_to_xflags) };
153 struct fsxattr fa;
154 int ret;
155
156 if (copy_from_user(&fa, arg, sizeof(fa)))
157 return -EFAULT;
158
159 s.set_projinherit = true;
160 s.projinherit = (fa.fsx_xflags & FS_XFLAG_PROJINHERIT) != 0;
161 fa.fsx_xflags &= ~FS_XFLAG_PROJINHERIT;
162
163 s.flags = map_flags_rev(bch_flags_to_xflags, fa.fsx_xflags);
164 if (fa.fsx_xflags)
165 return -EOPNOTSUPP;
166
167 if (fa.fsx_projid >= U32_MAX)
168 return -EINVAL;
169
170 /*
171 * inode fields accessible via the xattr interface are stored with a +1
172 * bias, so that 0 means unset:
173 */
174 s.projid = fa.fsx_projid + 1;
175
176 ret = mnt_want_write_file(file);
177 if (ret)
178 return ret;
179
180 inode_lock(&inode->v);
181 if (!inode_owner_or_capable(file_mnt_idmap(file), &inode->v)) {
182 ret = -EACCES;
183 goto err;
184 }
185
186 mutex_lock(&inode->ei_update_lock);
187 ret = bch2_subvol_is_ro(c, inode->ei_subvol) ?:
188 bch2_set_projid(c, inode, fa.fsx_projid) ?:
189 bch2_write_inode(c, inode, fssetxattr_inode_update_fn, &s,
190 ATTR_CTIME);
191 mutex_unlock(&inode->ei_update_lock);
192 err:
193 inode_unlock(&inode->v);
194 mnt_drop_write_file(file);
195 return ret;
196 }
197
198 static int bch2_reinherit_attrs_fn(struct btree_trans *trans,
199 struct bch_inode_info *inode,
200 struct bch_inode_unpacked *bi,
201 void *p)
202 {
203 struct bch_inode_info *dir = p;
204
205 return !bch2_reinherit_attrs(bi, &dir->ei_inode);
206 }
207
208 static int bch2_ioc_reinherit_attrs(struct bch_fs *c,
209 struct file *file,
210 struct bch_inode_info *src,
211 const char __user *name)
212 {
213 struct bch_hash_info hash = bch2_hash_info_init(c, &src->ei_inode);
214 struct bch_inode_info *dst;
215 struct inode *vinode = NULL;
216 char *kname = NULL;
217 struct qstr qstr;
218 int ret = 0;
219 subvol_inum inum;
220
221 kname = kmalloc(BCH_NAME_MAX + 1, GFP_KERNEL);
222 if (!kname)
223 return -ENOMEM;
224
225 ret = strncpy_from_user(kname, name, BCH_NAME_MAX);
226 if (unlikely(ret < 0))
227 goto err1;
228
229 qstr.len = ret;
230 qstr.name = kname;
231
232 ret = bch2_dirent_lookup(c, inode_inum(src), &hash, &qstr, &inum);
233 if (ret)
234 goto err1;
235
236 vinode = bch2_vfs_inode_get(c, inum);
237 ret = PTR_ERR_OR_ZERO(vinode);
238 if (ret)
239 goto err1;
240
241 dst = to_bch_ei(vinode);
242
243 ret = mnt_want_write_file(file);
244 if (ret)
245 goto err2;
246
247 bch2_lock_inodes(INODE_UPDATE_LOCK, src, dst);
248
249 if (inode_attr_changing(src, dst, Inode_opt_project)) {
250 ret = bch2_fs_quota_transfer(c, dst,
251 src->ei_qid,
252 1 << QTYP_PRJ,
253 KEY_TYPE_QUOTA_PREALLOC);
254 if (ret)
255 goto err3;
256 }
257
258 ret = bch2_write_inode(c, dst, bch2_reinherit_attrs_fn, src, 0);
259 err3:
260 bch2_unlock_inodes(INODE_UPDATE_LOCK, src, dst);
261
262 /* return true if we did work */
263 if (ret >= 0)
264 ret = !ret;
265
266 mnt_drop_write_file(file);
267 err2:
268 iput(vinode);
269 err1:
270 kfree(kname);
271
272 return ret;
273 }
274
275 static int bch2_ioc_getversion(struct bch_inode_info *inode, u32 __user *arg)
276 {
277 return put_user(inode->v.i_generation, arg);
278 }
279
280 static int bch2_ioc_getlabel(struct bch_fs *c, char __user *user_label)
281 {
282 int ret;
283 size_t len;
284 char label[BCH_SB_LABEL_SIZE];
285
286 BUILD_BUG_ON(BCH_SB_LABEL_SIZE >= FSLABEL_MAX);
287
288 mutex_lock(&c->sb_lock);
289 memcpy(label, c->disk_sb.sb->label, BCH_SB_LABEL_SIZE);
290 mutex_unlock(&c->sb_lock);
291
292 len = strnlen(label, BCH_SB_LABEL_SIZE);
293 if (len == BCH_SB_LABEL_SIZE) {
294 bch_warn(c,
295 "label is too long, return the first %zu bytes",
296 --len);
297 }
298
299 ret = copy_to_user(user_label, label, len);
300
301 return ret ? -EFAULT : 0;
302 }
303
304 static int bch2_ioc_setlabel(struct bch_fs *c,
305 struct file *file,
306 struct bch_inode_info *inode,
307 const char __user *user_label)
308 {
309 int ret;
310 char label[BCH_SB_LABEL_SIZE];
311
312 if (!capable(CAP_SYS_ADMIN))
313 return -EPERM;
314
315 if (copy_from_user(label, user_label, sizeof(label)))
316 return -EFAULT;
317
318 if (strnlen(label, BCH_SB_LABEL_SIZE) == BCH_SB_LABEL_SIZE) {
319 bch_err(c,
320 "unable to set label with more than %d bytes",
321 BCH_SB_LABEL_SIZE - 1);
322 return -EINVAL;
323 }
324
325 ret = mnt_want_write_file(file);
326 if (ret)
327 return ret;
328
329 mutex_lock(&c->sb_lock);
330 strscpy(c->disk_sb.sb->label, label, BCH_SB_LABEL_SIZE);
331 ret = bch2_write_super(c);
332 mutex_unlock(&c->sb_lock);
333
334 mnt_drop_write_file(file);
335 return ret;
336 }
337
338 static int bch2_ioc_goingdown(struct bch_fs *c, u32 __user *arg)
339 {
340 u32 flags;
341 int ret = 0;
342
343 if (!capable(CAP_SYS_ADMIN))
344 return -EPERM;
345
346 if (get_user(flags, arg))
347 return -EFAULT;
348
349 bch_notice(c, "shutdown by ioctl type %u", flags);
350
351 switch (flags) {
352 case FSOP_GOING_FLAGS_DEFAULT:
353 ret = bdev_freeze(c->vfs_sb->s_bdev);
354 if (ret)
355 break;
356 bch2_journal_flush(&c->journal);
357 bch2_fs_emergency_read_only(c);
358 bdev_thaw(c->vfs_sb->s_bdev);
359 break;
360 case FSOP_GOING_FLAGS_LOGFLUSH:
361 bch2_journal_flush(&c->journal);
362 fallthrough;
363 case FSOP_GOING_FLAGS_NOLOGFLUSH:
364 bch2_fs_emergency_read_only(c);
365 break;
366 default:
367 ret = -EINVAL;
368 break;
369 }
370
371 return ret;
372 }
373
374 static long bch2_ioctl_subvolume_create(struct bch_fs *c, struct file *filp,
375 struct bch_ioctl_subvolume arg)
376 {
377 struct inode *dir;
378 struct bch_inode_info *inode;
379 struct user_namespace *s_user_ns;
380 struct dentry *dst_dentry;
381 struct path src_path, dst_path;
382 int how = LOOKUP_FOLLOW;
383 int error;
384 subvol_inum snapshot_src = { 0 };
385 unsigned lookup_flags = 0;
386 unsigned create_flags = BCH_CREATE_SUBVOL;
387
388 if (arg.flags & ~(BCH_SUBVOL_SNAPSHOT_CREATE|
389 BCH_SUBVOL_SNAPSHOT_RO))
390 return -EINVAL;
391
392 if (!(arg.flags & BCH_SUBVOL_SNAPSHOT_CREATE) &&
393 (arg.src_ptr ||
394 (arg.flags & BCH_SUBVOL_SNAPSHOT_RO)))
395 return -EINVAL;
396
397 if (arg.flags & BCH_SUBVOL_SNAPSHOT_CREATE)
398 create_flags |= BCH_CREATE_SNAPSHOT;
399
400 if (arg.flags & BCH_SUBVOL_SNAPSHOT_RO)
401 create_flags |= BCH_CREATE_SNAPSHOT_RO;
402
403 if (arg.flags & BCH_SUBVOL_SNAPSHOT_CREATE) {
404 /* sync_inodes_sb enforce s_umount is locked */
405 down_read(&c->vfs_sb->s_umount);
406 sync_inodes_sb(c->vfs_sb);
407 up_read(&c->vfs_sb->s_umount);
408 }
409 retry:
410 if (arg.src_ptr) {
411 error = user_path_at(arg.dirfd,
412 (const char __user *)(unsigned long)arg.src_ptr,
413 how, &src_path);
414 if (error)
415 goto err1;
416
417 if (src_path.dentry->d_sb->s_fs_info != c) {
418 path_put(&src_path);
419 error = -EXDEV;
420 goto err1;
421 }
422
423 snapshot_src = inode_inum(to_bch_ei(src_path.dentry->d_inode));
424 }
425
426 dst_dentry = user_path_create(arg.dirfd,
427 (const char __user *)(unsigned long)arg.dst_ptr,
428 &dst_path, lookup_flags);
429 error = PTR_ERR_OR_ZERO(dst_dentry);
430 if (error)
431 goto err2;
432
433 if (dst_dentry->d_sb->s_fs_info != c) {
434 error = -EXDEV;
435 goto err3;
436 }
437
438 if (dst_dentry->d_inode) {
439 error = -BCH_ERR_EEXIST_subvolume_create;
440 goto err3;
441 }
442
443 dir = dst_path.dentry->d_inode;
444 if (IS_DEADDIR(dir)) {
445 error = -BCH_ERR_ENOENT_directory_dead;
446 goto err3;
447 }
448
449 s_user_ns = dir->i_sb->s_user_ns;
450 if (!kuid_has_mapping(s_user_ns, current_fsuid()) ||
451 !kgid_has_mapping(s_user_ns, current_fsgid())) {
452 error = -EOVERFLOW;
453 goto err3;
454 }
455
456 error = inode_permission(file_mnt_idmap(filp),
457 dir, MAY_WRITE | MAY_EXEC);
458 if (error)
459 goto err3;
460
461 if (!IS_POSIXACL(dir))
462 arg.mode &= ~current_umask();
463
464 error = security_path_mkdir(&dst_path, dst_dentry, arg.mode);
465 if (error)
466 goto err3;
467
468 if ((arg.flags & BCH_SUBVOL_SNAPSHOT_CREATE) &&
469 !arg.src_ptr)
470 snapshot_src.subvol = inode_inum(to_bch_ei(dir)).subvol;
471
472 down_write(&c->snapshot_create_lock);
473 inode = __bch2_create(file_mnt_idmap(filp), to_bch_ei(dir),
474 dst_dentry, arg.mode|S_IFDIR,
475 0, snapshot_src, create_flags);
476 up_write(&c->snapshot_create_lock);
477
478 error = PTR_ERR_OR_ZERO(inode);
479 if (error)
480 goto err3;
481
482 d_instantiate(dst_dentry, &inode->v);
483 fsnotify_mkdir(dir, dst_dentry);
484 err3:
485 done_path_create(&dst_path, dst_dentry);
486 err2:
487 if (arg.src_ptr)
488 path_put(&src_path);
489
490 if (retry_estale(error, lookup_flags)) {
491 lookup_flags |= LOOKUP_REVAL;
492 goto retry;
493 }
494 err1:
495 return error;
496 }
497
498 static long bch2_ioctl_subvolume_destroy(struct bch_fs *c, struct file *filp,
499 struct bch_ioctl_subvolume arg)
500 {
501 const char __user *name = (void __user *)(unsigned long)arg.dst_ptr;
502 struct path path;
503 struct inode *dir;
504 struct dentry *victim;
505 int ret = 0;
506
507 if (arg.flags)
508 return -EINVAL;
509
510 victim = user_path_locked_at(arg.dirfd, name, &path);
511 if (IS_ERR(victim))
512 return PTR_ERR(victim);
513
514 dir = d_inode(path.dentry);
515 if (victim->d_sb->s_fs_info != c) {
516 ret = -EXDEV;
517 goto err;
518 }
519 if (!d_is_positive(victim)) {
520 ret = -ENOENT;
521 goto err;
522 }
523 ret = __bch2_unlink(dir, victim, true);
524 if (!ret) {
525 fsnotify_rmdir(dir, victim);
526 d_delete(victim);
527 }
528 err:
529 inode_unlock(dir);
530 dput(victim);
531 path_put(&path);
532 return ret;
533 }
534
535 long bch2_fs_file_ioctl(struct file *file, unsigned cmd, unsigned long arg)
536 {
537 struct bch_inode_info *inode = file_bch_inode(file);
538 struct bch_fs *c = inode->v.i_sb->s_fs_info;
539 long ret;
540
541 switch (cmd) {
542 case FS_IOC_GETFLAGS:
543 ret = bch2_ioc_getflags(inode, (int __user *) arg);
544 break;
545
546 case FS_IOC_SETFLAGS:
547 ret = bch2_ioc_setflags(c, file, inode, (int __user *) arg);
548 break;
549
550 case FS_IOC_FSGETXATTR:
551 ret = bch2_ioc_fsgetxattr(inode, (void __user *) arg);
552 break;
553
554 case FS_IOC_FSSETXATTR:
555 ret = bch2_ioc_fssetxattr(c, file, inode,
556 (void __user *) arg);
557 break;
558
559 case BCHFS_IOC_REINHERIT_ATTRS:
560 ret = bch2_ioc_reinherit_attrs(c, file, inode,
561 (void __user *) arg);
562 break;
563
564 case FS_IOC_GETVERSION:
565 ret = bch2_ioc_getversion(inode, (u32 __user *) arg);
566 break;
567
568 case FS_IOC_SETVERSION:
569 ret = -ENOTTY;
570 break;
571
572 case FS_IOC_GETFSLABEL:
573 ret = bch2_ioc_getlabel(c, (void __user *) arg);
574 break;
575
576 case FS_IOC_SETFSLABEL:
577 ret = bch2_ioc_setlabel(c, file, inode, (const void __user *) arg);
578 break;
579
580 case FS_IOC_GOINGDOWN:
581 ret = bch2_ioc_goingdown(c, (u32 __user *) arg);
582 break;
583
584 case BCH_IOCTL_SUBVOLUME_CREATE: {
585 struct bch_ioctl_subvolume i;
586
587 ret = copy_from_user(&i, (void __user *) arg, sizeof(i))
588 ? -EFAULT
589 : bch2_ioctl_subvolume_create(c, file, i);
590 break;
591 }
592
593 case BCH_IOCTL_SUBVOLUME_DESTROY: {
594 struct bch_ioctl_subvolume i;
595
596 ret = copy_from_user(&i, (void __user *) arg, sizeof(i))
597 ? -EFAULT
598 : bch2_ioctl_subvolume_destroy(c, file, i);
599 break;
600 }
601
602 default:
603 ret = bch2_fs_ioctl(c, cmd, (void __user *) arg);
604 break;
605 }
606
607 return bch2_err_class(ret);
608 }
609
610 #ifdef CONFIG_COMPAT
611 long bch2_compat_fs_ioctl(struct file *file, unsigned cmd, unsigned long arg)
612 {
613 /* These are just misnamed, they actually get/put from/to user an int */
614 switch (cmd) {
615 case FS_IOC32_GETFLAGS:
616 cmd = FS_IOC_GETFLAGS;
617 break;
618 case FS_IOC32_SETFLAGS:
619 cmd = FS_IOC_SETFLAGS;
620 break;
621 case FS_IOC32_GETVERSION:
622 cmd = FS_IOC_GETVERSION;
623 break;
624 case FS_IOC_GETFSLABEL:
625 case FS_IOC_SETFSLABEL:
626 break;
627 default:
628 return -ENOIOCTLCMD;
629 }
630 return bch2_fs_file_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
631 }
632 #endif
633
634 #endif /* NO_BCACHEFS_FS */
635
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