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_goingdown(struct bch_fs *c, u32 __user *arg) 276 { 277 u32 flags; 278 int ret = 0; 279 280 if (!capable(CAP_SYS_ADMIN)) 281 return -EPERM; 282 283 if (get_user(flags, arg)) 284 return -EFAULT; 285 286 bch_notice(c, "shutdown by ioctl type %u", flags); 287 288 switch (flags) { 289 case FSOP_GOING_FLAGS_DEFAULT: 290 ret = bdev_freeze(c->vfs_sb->s_bdev); 291 if (ret) 292 break; 293 bch2_journal_flush(&c->journal); 294 bch2_fs_emergency_read_only(c); 295 bdev_thaw(c->vfs_sb->s_bdev); 296 break; 297 case FSOP_GOING_FLAGS_LOGFLUSH: 298 bch2_journal_flush(&c->journal); 299 fallthrough; 300 case FSOP_GOING_FLAGS_NOLOGFLUSH: 301 bch2_fs_emergency_read_only(c); 302 break; 303 default: 304 ret = -EINVAL; 305 break; 306 } 307 308 return ret; 309 } 310 311 static long __bch2_ioctl_subvolume_create(struct bch_fs *c, struct file *filp, 312 struct bch_ioctl_subvolume arg) 313 { 314 struct inode *dir; 315 struct bch_inode_info *inode; 316 struct user_namespace *s_user_ns; 317 struct dentry *dst_dentry; 318 struct path src_path, dst_path; 319 int how = LOOKUP_FOLLOW; 320 int error; 321 subvol_inum snapshot_src = { 0 }; 322 unsigned lookup_flags = 0; 323 unsigned create_flags = BCH_CREATE_SUBVOL; 324 325 if (arg.flags & ~(BCH_SUBVOL_SNAPSHOT_CREATE| 326 BCH_SUBVOL_SNAPSHOT_RO)) 327 return -EINVAL; 328 329 if (!(arg.flags & BCH_SUBVOL_SNAPSHOT_CREATE) && 330 (arg.src_ptr || 331 (arg.flags & BCH_SUBVOL_SNAPSHOT_RO))) 332 return -EINVAL; 333 334 if (arg.flags & BCH_SUBVOL_SNAPSHOT_CREATE) 335 create_flags |= BCH_CREATE_SNAPSHOT; 336 337 if (arg.flags & BCH_SUBVOL_SNAPSHOT_RO) 338 create_flags |= BCH_CREATE_SNAPSHOT_RO; 339 340 /* why do we need this lock? */ 341 down_read(&c->vfs_sb->s_umount); 342 343 if (arg.flags & BCH_SUBVOL_SNAPSHOT_CREATE) 344 sync_inodes_sb(c->vfs_sb); 345 retry: 346 if (arg.src_ptr) { 347 error = user_path_at(arg.dirfd, 348 (const char __user *)(unsigned long)arg.src_ptr, 349 how, &src_path); 350 if (error) 351 goto err1; 352 353 if (src_path.dentry->d_sb->s_fs_info != c) { 354 path_put(&src_path); 355 error = -EXDEV; 356 goto err1; 357 } 358 359 snapshot_src = inode_inum(to_bch_ei(src_path.dentry->d_inode)); 360 } 361 362 dst_dentry = user_path_create(arg.dirfd, 363 (const char __user *)(unsigned long)arg.dst_ptr, 364 &dst_path, lookup_flags); 365 error = PTR_ERR_OR_ZERO(dst_dentry); 366 if (error) 367 goto err2; 368 369 if (dst_dentry->d_sb->s_fs_info != c) { 370 error = -EXDEV; 371 goto err3; 372 } 373 374 if (dst_dentry->d_inode) { 375 error = -EEXIST; 376 goto err3; 377 } 378 379 dir = dst_path.dentry->d_inode; 380 if (IS_DEADDIR(dir)) { 381 error = -BCH_ERR_ENOENT_directory_dead; 382 goto err3; 383 } 384 385 s_user_ns = dir->i_sb->s_user_ns; 386 if (!kuid_has_mapping(s_user_ns, current_fsuid()) || 387 !kgid_has_mapping(s_user_ns, current_fsgid())) { 388 error = -EOVERFLOW; 389 goto err3; 390 } 391 392 error = inode_permission(file_mnt_idmap(filp), 393 dir, MAY_WRITE | MAY_EXEC); 394 if (error) 395 goto err3; 396 397 if (!IS_POSIXACL(dir)) 398 arg.mode &= ~current_umask(); 399 400 error = security_path_mkdir(&dst_path, dst_dentry, arg.mode); 401 if (error) 402 goto err3; 403 404 if ((arg.flags & BCH_SUBVOL_SNAPSHOT_CREATE) && 405 !arg.src_ptr) 406 snapshot_src.subvol = inode_inum(to_bch_ei(dir)).subvol; 407 408 inode = __bch2_create(file_mnt_idmap(filp), to_bch_ei(dir), 409 dst_dentry, arg.mode|S_IFDIR, 410 0, snapshot_src, create_flags); 411 error = PTR_ERR_OR_ZERO(inode); 412 if (error) 413 goto err3; 414 415 d_instantiate(dst_dentry, &inode->v); 416 fsnotify_mkdir(dir, dst_dentry); 417 err3: 418 done_path_create(&dst_path, dst_dentry); 419 err2: 420 if (arg.src_ptr) 421 path_put(&src_path); 422 423 if (retry_estale(error, lookup_flags)) { 424 lookup_flags |= LOOKUP_REVAL; 425 goto retry; 426 } 427 err1: 428 up_read(&c->vfs_sb->s_umount); 429 430 return error; 431 } 432 433 static long bch2_ioctl_subvolume_create(struct bch_fs *c, struct file *filp, 434 struct bch_ioctl_subvolume arg) 435 { 436 down_write(&c->snapshot_create_lock); 437 long ret = __bch2_ioctl_subvolume_create(c, filp, arg); 438 up_write(&c->snapshot_create_lock); 439 440 return ret; 441 } 442 443 static long bch2_ioctl_subvolume_destroy(struct bch_fs *c, struct file *filp, 444 struct bch_ioctl_subvolume arg) 445 { 446 const char __user *name = (void __user *)(unsigned long)arg.dst_ptr; 447 struct path path; 448 struct inode *dir; 449 struct dentry *victim; 450 int ret = 0; 451 452 if (arg.flags) 453 return -EINVAL; 454 455 victim = user_path_locked_at(arg.dirfd, name, &path); 456 if (IS_ERR(victim)) 457 return PTR_ERR(victim); 458 459 if (victim->d_sb->s_fs_info != c) { 460 ret = -EXDEV; 461 goto err; 462 } 463 if (!d_is_positive(victim)) { 464 ret = -ENOENT; 465 goto err; 466 } 467 dir = d_inode(path.dentry); 468 ret = __bch2_unlink(dir, victim, true); 469 if (!ret) { 470 fsnotify_rmdir(dir, victim); 471 d_delete(victim); 472 } 473 inode_unlock(dir); 474 err: 475 dput(victim); 476 path_put(&path); 477 return ret; 478 } 479 480 long bch2_fs_file_ioctl(struct file *file, unsigned cmd, unsigned long arg) 481 { 482 struct bch_inode_info *inode = file_bch_inode(file); 483 struct bch_fs *c = inode->v.i_sb->s_fs_info; 484 long ret; 485 486 switch (cmd) { 487 case FS_IOC_GETFLAGS: 488 ret = bch2_ioc_getflags(inode, (int __user *) arg); 489 break; 490 491 case FS_IOC_SETFLAGS: 492 ret = bch2_ioc_setflags(c, file, inode, (int __user *) arg); 493 break; 494 495 case FS_IOC_FSGETXATTR: 496 ret = bch2_ioc_fsgetxattr(inode, (void __user *) arg); 497 break; 498 499 case FS_IOC_FSSETXATTR: 500 ret = bch2_ioc_fssetxattr(c, file, inode, 501 (void __user *) arg); 502 break; 503 504 case BCHFS_IOC_REINHERIT_ATTRS: 505 ret = bch2_ioc_reinherit_attrs(c, file, inode, 506 (void __user *) arg); 507 break; 508 509 case FS_IOC_GETVERSION: 510 ret = -ENOTTY; 511 break; 512 513 case FS_IOC_SETVERSION: 514 ret = -ENOTTY; 515 break; 516 517 case FS_IOC_GOINGDOWN: 518 ret = bch2_ioc_goingdown(c, (u32 __user *) arg); 519 break; 520 521 case BCH_IOCTL_SUBVOLUME_CREATE: { 522 struct bch_ioctl_subvolume i; 523 524 ret = copy_from_user(&i, (void __user *) arg, sizeof(i)) 525 ? -EFAULT 526 : bch2_ioctl_subvolume_create(c, file, i); 527 break; 528 } 529 530 case BCH_IOCTL_SUBVOLUME_DESTROY: { 531 struct bch_ioctl_subvolume i; 532 533 ret = copy_from_user(&i, (void __user *) arg, sizeof(i)) 534 ? -EFAULT 535 : bch2_ioctl_subvolume_destroy(c, file, i); 536 break; 537 } 538 539 default: 540 ret = bch2_fs_ioctl(c, cmd, (void __user *) arg); 541 break; 542 } 543 544 return bch2_err_class(ret); 545 } 546 547 #ifdef CONFIG_COMPAT 548 long bch2_compat_fs_ioctl(struct file *file, unsigned cmd, unsigned long arg) 549 { 550 /* These are just misnamed, they actually get/put from/to user an int */ 551 switch (cmd) { 552 case FS_IOC_GETFLAGS: 553 cmd = FS_IOC_GETFLAGS; 554 break; 555 case FS_IOC32_SETFLAGS: 556 cmd = FS_IOC_SETFLAGS; 557 break; 558 default: 559 return -ENOIOCTLCMD; 560 } 561 return bch2_fs_file_ioctl(file, cmd, (unsigned long) compat_ptr(arg)); 562 } 563 #endif 564 565 #endif /* NO_BCACHEFS_FS */ 566