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 43 static struct kmem_cache *bch2_inode_cache; 44 45 static 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 50 void 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 80 int __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; 89 retry: 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 "%s: inode %u:%llu not found when updating", 112 bch2_err_str(ret), 113 inode_inum(inode).subvol, 114 inode_inum(inode).inum); 115 116 bch2_trans_put(trans); 117 return ret < 0 ? ret : 0; 118 } 119 120 int bch2_fs_quota_transfer(struct bch_fs *c, 121 struct bch_inode_info *inode, 122 struct bch_qid new_qid, 123 unsigned qtypes, 124 enum quota_acct_mode mode) 125 { 126 unsigned i; 127 int ret; 128 129 qtypes &= enabled_qtypes(c); 130 131 for (i = 0; i < QTYP_NR; i++) 132 if (new_qid.q[i] == inode->ei_qid.q[i]) 133 qtypes &= ~(1U << i); 134 135 if (!qtypes) 136 return 0; 137 138 mutex_lock(&inode->ei_quota_lock); 139 140 ret = bch2_quota_transfer(c, qtypes, new_qid, 141 inode->ei_qid, 142 inode->v.i_blocks + 143 inode->ei_quota_reserved, 144 mode); 145 if (!ret) 146 for (i = 0; i < QTYP_NR; i++) 147 if (qtypes & (1 << i)) 148 inode->ei_qid.q[i] = new_qid.q[i]; 149 150 mutex_unlock(&inode->ei_quota_lock); 151 152 return ret; 153 } 154 155 static int bch2_iget5_test(struct inode *vinode, void *p) 156 { 157 struct bch_inode_info *inode = to_bch_ei(vinode); 158 subvol_inum *inum = p; 159 160 return inode->ei_subvol == inum->subvol && 161 inode->ei_inode.bi_inum == inum->inum; 162 } 163 164 static int bch2_iget5_set(struct inode *vinode, void *p) 165 { 166 struct bch_inode_info *inode = to_bch_ei(vinode); 167 subvol_inum *inum = p; 168 169 inode->v.i_ino = inum->inum; 170 inode->ei_subvol = inum->subvol; 171 inode->ei_inode.bi_inum = inum->inum; 172 return 0; 173 } 174 175 static unsigned bch2_inode_hash(subvol_inum inum) 176 { 177 return jhash_3words(inum.subvol, inum.inum >> 32, inum.inum, JHASH_INITVAL); 178 } 179 180 static struct bch_inode_info *bch2_inode_insert(struct bch_fs *c, struct bch_inode_info *inode) 181 { 182 subvol_inum inum = inode_inum(inode); 183 struct bch_inode_info *old = to_bch_ei(inode_insert5(&inode->v, 184 bch2_inode_hash(inum), 185 bch2_iget5_test, 186 bch2_iget5_set, 187 &inum)); 188 BUG_ON(!old); 189 190 if (unlikely(old != inode)) { 191 __destroy_inode(&inode->v); 192 kmem_cache_free(bch2_inode_cache, inode); 193 inode = old; 194 } else { 195 mutex_lock(&c->vfs_inodes_lock); 196 list_add(&inode->ei_vfs_inode_list, &c->vfs_inodes_list); 197 mutex_unlock(&c->vfs_inodes_lock); 198 /* 199 * we really don't want insert_inode_locked2() to be setting 200 * I_NEW... 201 */ 202 unlock_new_inode(&inode->v); 203 } 204 205 return inode; 206 } 207 208 #define memalloc_flags_do(_flags, _do) \ 209 ({ \ 210 unsigned _saved_flags = memalloc_flags_save(_flags); \ 211 typeof(_do) _ret = _do; \ 212 memalloc_noreclaim_restore(_saved_flags); \ 213 _ret; \ 214 }) 215 216 /* 217 * Allocate a new inode, dropping/retaking btree locks if necessary: 218 */ 219 static struct bch_inode_info *bch2_new_inode(struct btree_trans *trans) 220 { 221 struct bch_fs *c = trans->c; 222 223 struct bch_inode_info *inode = 224 memalloc_flags_do(PF_MEMALLOC_NORECLAIM|PF_MEMALLOC_NOWARN, 225 to_bch_ei(new_inode(c->vfs_sb))); 226 227 if (unlikely(!inode)) { 228 int ret = drop_locks_do(trans, (inode = to_bch_ei(new_inode(c->vfs_sb))) ? 0 : -ENOMEM); 229 if (ret && inode) { 230 __destroy_inode(&inode->v); 231 kmem_cache_free(bch2_inode_cache, inode); 232 } 233 if (ret) 234 return ERR_PTR(ret); 235 } 236 237 return inode; 238 } 239 240 struct inode *bch2_vfs_inode_get(struct bch_fs *c, subvol_inum inum) 241 { 242 struct bch_inode_info *inode = 243 to_bch_ei(ilookup5_nowait(c->vfs_sb, 244 bch2_inode_hash(inum), 245 bch2_iget5_test, 246 &inum)); 247 if (inode) 248 return &inode->v; 249 250 struct btree_trans *trans = bch2_trans_get(c); 251 252 struct bch_inode_unpacked inode_u; 253 struct bch_subvolume subvol; 254 int ret = lockrestart_do(trans, 255 bch2_subvolume_get(trans, inum.subvol, true, 0, &subvol) ?: 256 bch2_inode_find_by_inum_trans(trans, inum, &inode_u)) ?: 257 PTR_ERR_OR_ZERO(inode = bch2_new_inode(trans)); 258 if (!ret) { 259 bch2_vfs_inode_init(trans, inum, inode, &inode_u, &subvol); 260 inode = bch2_inode_insert(c, inode); 261 } 262 bch2_trans_put(trans); 263 264 return ret ? ERR_PTR(ret) : &inode->v; 265 } 266 267 struct bch_inode_info * 268 __bch2_create(struct mnt_idmap *idmap, 269 struct bch_inode_info *dir, struct dentry *dentry, 270 umode_t mode, dev_t rdev, subvol_inum snapshot_src, 271 unsigned flags) 272 { 273 struct bch_fs *c = dir->v.i_sb->s_fs_info; 274 struct btree_trans *trans; 275 struct bch_inode_unpacked dir_u; 276 struct bch_inode_info *inode; 277 struct bch_inode_unpacked inode_u; 278 struct posix_acl *default_acl = NULL, *acl = NULL; 279 subvol_inum inum; 280 struct bch_subvolume subvol; 281 u64 journal_seq = 0; 282 int ret; 283 284 /* 285 * preallocate acls + vfs inode before btree transaction, so that 286 * nothing can fail after the transaction succeeds: 287 */ 288 #ifdef CONFIG_BCACHEFS_POSIX_ACL 289 ret = posix_acl_create(&dir->v, &mode, &default_acl, &acl); 290 if (ret) 291 return ERR_PTR(ret); 292 #endif 293 inode = to_bch_ei(new_inode(c->vfs_sb)); 294 if (unlikely(!inode)) { 295 inode = ERR_PTR(-ENOMEM); 296 goto err; 297 } 298 299 bch2_inode_init_early(c, &inode_u); 300 301 if (!(flags & BCH_CREATE_TMPFILE)) 302 mutex_lock(&dir->ei_update_lock); 303 304 trans = bch2_trans_get(c); 305 retry: 306 bch2_trans_begin(trans); 307 308 ret = bch2_subvol_is_ro_trans(trans, dir->ei_subvol) ?: 309 bch2_create_trans(trans, 310 inode_inum(dir), &dir_u, &inode_u, 311 !(flags & BCH_CREATE_TMPFILE) 312 ? &dentry->d_name : NULL, 313 from_kuid(i_user_ns(&dir->v), current_fsuid()), 314 from_kgid(i_user_ns(&dir->v), current_fsgid()), 315 mode, rdev, 316 default_acl, acl, snapshot_src, flags) ?: 317 bch2_quota_acct(c, bch_qid(&inode_u), Q_INO, 1, 318 KEY_TYPE_QUOTA_PREALLOC); 319 if (unlikely(ret)) 320 goto err_before_quota; 321 322 inum.subvol = inode_u.bi_subvol ?: dir->ei_subvol; 323 inum.inum = inode_u.bi_inum; 324 325 ret = bch2_subvolume_get(trans, inum.subvol, true, 326 BTREE_ITER_WITH_UPDATES, &subvol) ?: 327 bch2_trans_commit(trans, NULL, &journal_seq, 0); 328 if (unlikely(ret)) { 329 bch2_quota_acct(c, bch_qid(&inode_u), Q_INO, -1, 330 KEY_TYPE_QUOTA_WARN); 331 err_before_quota: 332 if (bch2_err_matches(ret, BCH_ERR_transaction_restart)) 333 goto retry; 334 goto err_trans; 335 } 336 337 if (!(flags & BCH_CREATE_TMPFILE)) { 338 bch2_inode_update_after_write(trans, dir, &dir_u, 339 ATTR_MTIME|ATTR_CTIME); 340 mutex_unlock(&dir->ei_update_lock); 341 } 342 343 bch2_vfs_inode_init(trans, inum, inode, &inode_u, &subvol); 344 345 set_cached_acl(&inode->v, ACL_TYPE_ACCESS, acl); 346 set_cached_acl(&inode->v, ACL_TYPE_DEFAULT, default_acl); 347 348 /* 349 * we must insert the new inode into the inode cache before calling 350 * bch2_trans_exit() and dropping locks, else we could race with another 351 * thread pulling the inode in and modifying it: 352 */ 353 inode = bch2_inode_insert(c, inode); 354 bch2_trans_put(trans); 355 err: 356 posix_acl_release(default_acl); 357 posix_acl_release(acl); 358 return inode; 359 err_trans: 360 if (!(flags & BCH_CREATE_TMPFILE)) 361 mutex_unlock(&dir->ei_update_lock); 362 363 bch2_trans_put(trans); 364 make_bad_inode(&inode->v); 365 iput(&inode->v); 366 inode = ERR_PTR(ret); 367 goto err; 368 } 369 370 /* methods */ 371 372 static struct bch_inode_info *bch2_lookup_trans(struct btree_trans *trans, 373 subvol_inum dir, struct bch_hash_info *dir_hash_info, 374 const struct qstr *name) 375 { 376 struct bch_fs *c = trans->c; 377 struct btree_iter dirent_iter = {}; 378 subvol_inum inum = {}; 379 380 int ret = bch2_hash_lookup(trans, &dirent_iter, bch2_dirent_hash_desc, 381 dir_hash_info, dir, name, 0); 382 if (ret) 383 return ERR_PTR(ret); 384 385 struct bkey_s_c k = bch2_btree_iter_peek_slot(&dirent_iter); 386 ret = bkey_err(k); 387 if (ret) 388 goto err; 389 390 ret = bch2_dirent_read_target(trans, dir, bkey_s_c_to_dirent(k), &inum); 391 if (ret > 0) 392 ret = -ENOENT; 393 if (ret) 394 goto err; 395 396 struct bch_inode_info *inode = 397 to_bch_ei(ilookup5_nowait(c->vfs_sb, 398 bch2_inode_hash(inum), 399 bch2_iget5_test, 400 &inum)); 401 if (inode) 402 goto out; 403 404 struct bch_subvolume subvol; 405 struct bch_inode_unpacked inode_u; 406 ret = bch2_subvolume_get(trans, inum.subvol, true, 0, &subvol) ?: 407 bch2_inode_find_by_inum_nowarn_trans(trans, inum, &inode_u) ?: 408 PTR_ERR_OR_ZERO(inode = bch2_new_inode(trans)); 409 if (bch2_err_matches(ret, ENOENT)) { 410 struct printbuf buf = PRINTBUF; 411 412 bch2_bkey_val_to_text(&buf, c, k); 413 bch_err(c, "%s points to missing inode", buf.buf); 414 printbuf_exit(&buf); 415 } 416 if (ret) 417 goto err; 418 419 bch2_vfs_inode_init(trans, inum, inode, &inode_u, &subvol); 420 inode = bch2_inode_insert(c, inode); 421 out: 422 bch2_trans_iter_exit(trans, &dirent_iter); 423 return inode; 424 err: 425 inode = ERR_PTR(ret); 426 goto out; 427 } 428 429 static struct dentry *bch2_lookup(struct inode *vdir, struct dentry *dentry, 430 unsigned int flags) 431 { 432 struct bch_fs *c = vdir->i_sb->s_fs_info; 433 struct bch_inode_info *dir = to_bch_ei(vdir); 434 struct bch_hash_info hash = bch2_hash_info_init(c, &dir->ei_inode); 435 436 struct bch_inode_info *inode; 437 bch2_trans_do(c, NULL, NULL, 0, 438 PTR_ERR_OR_ZERO(inode = bch2_lookup_trans(trans, inode_inum(dir), 439 &hash, &dentry->d_name))); 440 if (IS_ERR(inode)) 441 inode = NULL; 442 443 return d_splice_alias(&inode->v, dentry); 444 } 445 446 static int bch2_mknod(struct mnt_idmap *idmap, 447 struct inode *vdir, struct dentry *dentry, 448 umode_t mode, dev_t rdev) 449 { 450 struct bch_inode_info *inode = 451 __bch2_create(idmap, to_bch_ei(vdir), dentry, mode, rdev, 452 (subvol_inum) { 0 }, 0); 453 454 if (IS_ERR(inode)) 455 return bch2_err_class(PTR_ERR(inode)); 456 457 d_instantiate(dentry, &inode->v); 458 return 0; 459 } 460 461 static int bch2_create(struct mnt_idmap *idmap, 462 struct inode *vdir, struct dentry *dentry, 463 umode_t mode, bool excl) 464 { 465 return bch2_mknod(idmap, vdir, dentry, mode|S_IFREG, 0); 466 } 467 468 static int __bch2_link(struct bch_fs *c, 469 struct bch_inode_info *inode, 470 struct bch_inode_info *dir, 471 struct dentry *dentry) 472 { 473 struct btree_trans *trans = bch2_trans_get(c); 474 struct bch_inode_unpacked dir_u, inode_u; 475 int ret; 476 477 mutex_lock(&inode->ei_update_lock); 478 479 ret = commit_do(trans, NULL, NULL, 0, 480 bch2_link_trans(trans, 481 inode_inum(dir), &dir_u, 482 inode_inum(inode), &inode_u, 483 &dentry->d_name)); 484 485 if (likely(!ret)) { 486 bch2_inode_update_after_write(trans, dir, &dir_u, 487 ATTR_MTIME|ATTR_CTIME); 488 bch2_inode_update_after_write(trans, inode, &inode_u, ATTR_CTIME); 489 } 490 491 bch2_trans_put(trans); 492 mutex_unlock(&inode->ei_update_lock); 493 return ret; 494 } 495 496 static int bch2_link(struct dentry *old_dentry, struct inode *vdir, 497 struct dentry *dentry) 498 { 499 struct bch_fs *c = vdir->i_sb->s_fs_info; 500 struct bch_inode_info *dir = to_bch_ei(vdir); 501 struct bch_inode_info *inode = to_bch_ei(old_dentry->d_inode); 502 int ret; 503 504 lockdep_assert_held(&inode->v.i_rwsem); 505 506 ret = bch2_subvol_is_ro(c, dir->ei_subvol) ?: 507 bch2_subvol_is_ro(c, inode->ei_subvol) ?: 508 __bch2_link(c, inode, dir, dentry); 509 if (unlikely(ret)) 510 return bch2_err_class(ret); 511 512 ihold(&inode->v); 513 d_instantiate(dentry, &inode->v); 514 return 0; 515 } 516 517 int __bch2_unlink(struct inode *vdir, struct dentry *dentry, 518 bool deleting_snapshot) 519 { 520 struct bch_fs *c = vdir->i_sb->s_fs_info; 521 struct bch_inode_info *dir = to_bch_ei(vdir); 522 struct bch_inode_info *inode = to_bch_ei(dentry->d_inode); 523 struct bch_inode_unpacked dir_u, inode_u; 524 struct btree_trans *trans = bch2_trans_get(c); 525 int ret; 526 527 bch2_lock_inodes(INODE_UPDATE_LOCK, dir, inode); 528 529 ret = commit_do(trans, NULL, NULL, 530 BCH_TRANS_COMMIT_no_enospc, 531 bch2_unlink_trans(trans, 532 inode_inum(dir), &dir_u, 533 &inode_u, &dentry->d_name, 534 deleting_snapshot)); 535 if (unlikely(ret)) 536 goto err; 537 538 bch2_inode_update_after_write(trans, dir, &dir_u, 539 ATTR_MTIME|ATTR_CTIME); 540 bch2_inode_update_after_write(trans, inode, &inode_u, 541 ATTR_MTIME); 542 543 if (inode_u.bi_subvol) { 544 /* 545 * Subvolume deletion is asynchronous, but we still want to tell 546 * the VFS that it's been deleted here: 547 */ 548 set_nlink(&inode->v, 0); 549 } 550 err: 551 bch2_unlock_inodes(INODE_UPDATE_LOCK, dir, inode); 552 bch2_trans_put(trans); 553 554 return ret; 555 } 556 557 static int bch2_unlink(struct inode *vdir, struct dentry *dentry) 558 { 559 struct bch_inode_info *dir= to_bch_ei(vdir); 560 struct bch_fs *c = dir->v.i_sb->s_fs_info; 561 562 int ret = bch2_subvol_is_ro(c, dir->ei_subvol) ?: 563 __bch2_unlink(vdir, dentry, false); 564 return bch2_err_class(ret); 565 } 566 567 static int bch2_symlink(struct mnt_idmap *idmap, 568 struct inode *vdir, struct dentry *dentry, 569 const char *symname) 570 { 571 struct bch_fs *c = vdir->i_sb->s_fs_info; 572 struct bch_inode_info *dir = to_bch_ei(vdir), *inode; 573 int ret; 574 575 inode = __bch2_create(idmap, dir, dentry, S_IFLNK|S_IRWXUGO, 0, 576 (subvol_inum) { 0 }, BCH_CREATE_TMPFILE); 577 if (IS_ERR(inode)) 578 return bch2_err_class(PTR_ERR(inode)); 579 580 inode_lock(&inode->v); 581 ret = page_symlink(&inode->v, symname, strlen(symname) + 1); 582 inode_unlock(&inode->v); 583 584 if (unlikely(ret)) 585 goto err; 586 587 ret = filemap_write_and_wait_range(inode->v.i_mapping, 0, LLONG_MAX); 588 if (unlikely(ret)) 589 goto err; 590 591 ret = __bch2_link(c, inode, dir, dentry); 592 if (unlikely(ret)) 593 goto err; 594 595 d_instantiate(dentry, &inode->v); 596 return 0; 597 err: 598 iput(&inode->v); 599 return bch2_err_class(ret); 600 } 601 602 static int bch2_mkdir(struct mnt_idmap *idmap, 603 struct inode *vdir, struct dentry *dentry, umode_t mode) 604 { 605 return bch2_mknod(idmap, vdir, dentry, mode|S_IFDIR, 0); 606 } 607 608 static int bch2_rename2(struct mnt_idmap *idmap, 609 struct inode *src_vdir, struct dentry *src_dentry, 610 struct inode *dst_vdir, struct dentry *dst_dentry, 611 unsigned flags) 612 { 613 struct bch_fs *c = src_vdir->i_sb->s_fs_info; 614 struct bch_inode_info *src_dir = to_bch_ei(src_vdir); 615 struct bch_inode_info *dst_dir = to_bch_ei(dst_vdir); 616 struct bch_inode_info *src_inode = to_bch_ei(src_dentry->d_inode); 617 struct bch_inode_info *dst_inode = to_bch_ei(dst_dentry->d_inode); 618 struct bch_inode_unpacked dst_dir_u, src_dir_u; 619 struct bch_inode_unpacked src_inode_u, dst_inode_u; 620 struct btree_trans *trans; 621 enum bch_rename_mode mode = flags & RENAME_EXCHANGE 622 ? BCH_RENAME_EXCHANGE 623 : dst_dentry->d_inode 624 ? BCH_RENAME_OVERWRITE : BCH_RENAME; 625 int ret; 626 627 if (flags & ~(RENAME_NOREPLACE|RENAME_EXCHANGE)) 628 return -EINVAL; 629 630 if (mode == BCH_RENAME_OVERWRITE) { 631 ret = filemap_write_and_wait_range(src_inode->v.i_mapping, 632 0, LLONG_MAX); 633 if (ret) 634 return ret; 635 } 636 637 trans = bch2_trans_get(c); 638 639 bch2_lock_inodes(INODE_UPDATE_LOCK, 640 src_dir, 641 dst_dir, 642 src_inode, 643 dst_inode); 644 645 ret = bch2_subvol_is_ro_trans(trans, src_dir->ei_subvol) ?: 646 bch2_subvol_is_ro_trans(trans, dst_dir->ei_subvol); 647 if (ret) 648 goto err; 649 650 if (inode_attr_changing(dst_dir, src_inode, Inode_opt_project)) { 651 ret = bch2_fs_quota_transfer(c, src_inode, 652 dst_dir->ei_qid, 653 1 << QTYP_PRJ, 654 KEY_TYPE_QUOTA_PREALLOC); 655 if (ret) 656 goto err; 657 } 658 659 if (mode == BCH_RENAME_EXCHANGE && 660 inode_attr_changing(src_dir, dst_inode, Inode_opt_project)) { 661 ret = bch2_fs_quota_transfer(c, dst_inode, 662 src_dir->ei_qid, 663 1 << QTYP_PRJ, 664 KEY_TYPE_QUOTA_PREALLOC); 665 if (ret) 666 goto err; 667 } 668 669 ret = commit_do(trans, NULL, NULL, 0, 670 bch2_rename_trans(trans, 671 inode_inum(src_dir), &src_dir_u, 672 inode_inum(dst_dir), &dst_dir_u, 673 &src_inode_u, 674 &dst_inode_u, 675 &src_dentry->d_name, 676 &dst_dentry->d_name, 677 mode)); 678 if (unlikely(ret)) 679 goto err; 680 681 BUG_ON(src_inode->v.i_ino != src_inode_u.bi_inum); 682 BUG_ON(dst_inode && 683 dst_inode->v.i_ino != dst_inode_u.bi_inum); 684 685 bch2_inode_update_after_write(trans, src_dir, &src_dir_u, 686 ATTR_MTIME|ATTR_CTIME); 687 688 if (src_dir != dst_dir) 689 bch2_inode_update_after_write(trans, dst_dir, &dst_dir_u, 690 ATTR_MTIME|ATTR_CTIME); 691 692 bch2_inode_update_after_write(trans, src_inode, &src_inode_u, 693 ATTR_CTIME); 694 695 if (dst_inode) 696 bch2_inode_update_after_write(trans, dst_inode, &dst_inode_u, 697 ATTR_CTIME); 698 err: 699 bch2_trans_put(trans); 700 701 bch2_fs_quota_transfer(c, src_inode, 702 bch_qid(&src_inode->ei_inode), 703 1 << QTYP_PRJ, 704 KEY_TYPE_QUOTA_NOCHECK); 705 if (dst_inode) 706 bch2_fs_quota_transfer(c, dst_inode, 707 bch_qid(&dst_inode->ei_inode), 708 1 << QTYP_PRJ, 709 KEY_TYPE_QUOTA_NOCHECK); 710 711 bch2_unlock_inodes(INODE_UPDATE_LOCK, 712 src_dir, 713 dst_dir, 714 src_inode, 715 dst_inode); 716 717 return bch2_err_class(ret); 718 } 719 720 static void bch2_setattr_copy(struct mnt_idmap *idmap, 721 struct bch_inode_info *inode, 722 struct bch_inode_unpacked *bi, 723 struct iattr *attr) 724 { 725 struct bch_fs *c = inode->v.i_sb->s_fs_info; 726 unsigned int ia_valid = attr->ia_valid; 727 728 if (ia_valid & ATTR_UID) 729 bi->bi_uid = from_kuid(i_user_ns(&inode->v), attr->ia_uid); 730 if (ia_valid & ATTR_GID) 731 bi->bi_gid = from_kgid(i_user_ns(&inode->v), attr->ia_gid); 732 733 if (ia_valid & ATTR_SIZE) 734 bi->bi_size = attr->ia_size; 735 736 if (ia_valid & ATTR_ATIME) 737 bi->bi_atime = timespec_to_bch2_time(c, attr->ia_atime); 738 if (ia_valid & ATTR_MTIME) 739 bi->bi_mtime = timespec_to_bch2_time(c, attr->ia_mtime); 740 if (ia_valid & ATTR_CTIME) 741 bi->bi_ctime = timespec_to_bch2_time(c, attr->ia_ctime); 742 743 if (ia_valid & ATTR_MODE) { 744 umode_t mode = attr->ia_mode; 745 kgid_t gid = ia_valid & ATTR_GID 746 ? attr->ia_gid 747 : inode->v.i_gid; 748 749 if (!in_group_p(gid) && 750 !capable_wrt_inode_uidgid(idmap, &inode->v, CAP_FSETID)) 751 mode &= ~S_ISGID; 752 bi->bi_mode = mode; 753 } 754 } 755 756 int bch2_setattr_nonsize(struct mnt_idmap *idmap, 757 struct bch_inode_info *inode, 758 struct iattr *attr) 759 { 760 struct bch_fs *c = inode->v.i_sb->s_fs_info; 761 struct bch_qid qid; 762 struct btree_trans *trans; 763 struct btree_iter inode_iter = { NULL }; 764 struct bch_inode_unpacked inode_u; 765 struct posix_acl *acl = NULL; 766 int ret; 767 768 mutex_lock(&inode->ei_update_lock); 769 770 qid = inode->ei_qid; 771 772 if (attr->ia_valid & ATTR_UID) 773 qid.q[QTYP_USR] = from_kuid(i_user_ns(&inode->v), attr->ia_uid); 774 775 if (attr->ia_valid & ATTR_GID) 776 qid.q[QTYP_GRP] = from_kgid(i_user_ns(&inode->v), attr->ia_gid); 777 778 ret = bch2_fs_quota_transfer(c, inode, qid, ~0, 779 KEY_TYPE_QUOTA_PREALLOC); 780 if (ret) 781 goto err; 782 783 trans = bch2_trans_get(c); 784 retry: 785 bch2_trans_begin(trans); 786 kfree(acl); 787 acl = NULL; 788 789 ret = bch2_inode_peek(trans, &inode_iter, &inode_u, inode_inum(inode), 790 BTREE_ITER_INTENT); 791 if (ret) 792 goto btree_err; 793 794 bch2_setattr_copy(idmap, inode, &inode_u, attr); 795 796 if (attr->ia_valid & ATTR_MODE) { 797 ret = bch2_acl_chmod(trans, inode_inum(inode), &inode_u, 798 inode_u.bi_mode, &acl); 799 if (ret) 800 goto btree_err; 801 } 802 803 ret = bch2_inode_write(trans, &inode_iter, &inode_u) ?: 804 bch2_trans_commit(trans, NULL, NULL, 805 BCH_TRANS_COMMIT_no_enospc); 806 btree_err: 807 bch2_trans_iter_exit(trans, &inode_iter); 808 809 if (bch2_err_matches(ret, BCH_ERR_transaction_restart)) 810 goto retry; 811 if (unlikely(ret)) 812 goto err_trans; 813 814 bch2_inode_update_after_write(trans, inode, &inode_u, attr->ia_valid); 815 816 if (acl) 817 set_cached_acl(&inode->v, ACL_TYPE_ACCESS, acl); 818 err_trans: 819 bch2_trans_put(trans); 820 err: 821 mutex_unlock(&inode->ei_update_lock); 822 823 return bch2_err_class(ret); 824 } 825 826 static int bch2_getattr(struct mnt_idmap *idmap, 827 const struct path *path, struct kstat *stat, 828 u32 request_mask, unsigned query_flags) 829 { 830 struct bch_inode_info *inode = to_bch_ei(d_inode(path->dentry)); 831 struct bch_fs *c = inode->v.i_sb->s_fs_info; 832 833 stat->dev = inode->v.i_sb->s_dev; 834 stat->ino = inode->v.i_ino; 835 stat->mode = inode->v.i_mode; 836 stat->nlink = inode->v.i_nlink; 837 stat->uid = inode->v.i_uid; 838 stat->gid = inode->v.i_gid; 839 stat->rdev = inode->v.i_rdev; 840 stat->size = i_size_read(&inode->v); 841 stat->atime = inode_get_atime(&inode->v); 842 stat->mtime = inode_get_mtime(&inode->v); 843 stat->ctime = inode_get_ctime(&inode->v); 844 stat->blksize = block_bytes(c); 845 stat->blocks = inode->v.i_blocks; 846 847 if (request_mask & STATX_BTIME) { 848 stat->result_mask |= STATX_BTIME; 849 stat->btime = bch2_time_to_timespec(c, inode->ei_inode.bi_otime); 850 } 851 852 if (inode->ei_inode.bi_flags & BCH_INODE_immutable) 853 stat->attributes |= STATX_ATTR_IMMUTABLE; 854 stat->attributes_mask |= STATX_ATTR_IMMUTABLE; 855 856 if (inode->ei_inode.bi_flags & BCH_INODE_append) 857 stat->attributes |= STATX_ATTR_APPEND; 858 stat->attributes_mask |= STATX_ATTR_APPEND; 859 860 if (inode->ei_inode.bi_flags & BCH_INODE_nodump) 861 stat->attributes |= STATX_ATTR_NODUMP; 862 stat->attributes_mask |= STATX_ATTR_NODUMP; 863 864 return 0; 865 } 866 867 static int bch2_setattr(struct mnt_idmap *idmap, 868 struct dentry *dentry, struct iattr *iattr) 869 { 870 struct bch_inode_info *inode = to_bch_ei(dentry->d_inode); 871 struct bch_fs *c = inode->v.i_sb->s_fs_info; 872 int ret; 873 874 lockdep_assert_held(&inode->v.i_rwsem); 875 876 ret = bch2_subvol_is_ro(c, inode->ei_subvol) ?: 877 setattr_prepare(idmap, dentry, iattr); 878 if (ret) 879 return ret; 880 881 return iattr->ia_valid & ATTR_SIZE 882 ? bchfs_truncate(idmap, inode, iattr) 883 : bch2_setattr_nonsize(idmap, inode, iattr); 884 } 885 886 static int bch2_tmpfile(struct mnt_idmap *idmap, 887 struct inode *vdir, struct file *file, umode_t mode) 888 { 889 struct bch_inode_info *inode = 890 __bch2_create(idmap, to_bch_ei(vdir), 891 file->f_path.dentry, mode, 0, 892 (subvol_inum) { 0 }, BCH_CREATE_TMPFILE); 893 894 if (IS_ERR(inode)) 895 return bch2_err_class(PTR_ERR(inode)); 896 897 d_mark_tmpfile(file, &inode->v); 898 d_instantiate(file->f_path.dentry, &inode->v); 899 return finish_open_simple(file, 0); 900 } 901 902 static int bch2_fill_extent(struct bch_fs *c, 903 struct fiemap_extent_info *info, 904 struct bkey_s_c k, unsigned flags) 905 { 906 if (bkey_extent_is_direct_data(k.k)) { 907 struct bkey_ptrs_c ptrs = bch2_bkey_ptrs_c(k); 908 const union bch_extent_entry *entry; 909 struct extent_ptr_decoded p; 910 int ret; 911 912 if (k.k->type == KEY_TYPE_reflink_v) 913 flags |= FIEMAP_EXTENT_SHARED; 914 915 bkey_for_each_ptr_decode(k.k, ptrs, p, entry) { 916 int flags2 = 0; 917 u64 offset = p.ptr.offset; 918 919 if (p.ptr.unwritten) 920 flags2 |= FIEMAP_EXTENT_UNWRITTEN; 921 922 if (p.crc.compression_type) 923 flags2 |= FIEMAP_EXTENT_ENCODED; 924 else 925 offset += p.crc.offset; 926 927 if ((offset & (block_sectors(c) - 1)) || 928 (k.k->size & (block_sectors(c) - 1))) 929 flags2 |= FIEMAP_EXTENT_NOT_ALIGNED; 930 931 ret = fiemap_fill_next_extent(info, 932 bkey_start_offset(k.k) << 9, 933 offset << 9, 934 k.k->size << 9, flags|flags2); 935 if (ret) 936 return ret; 937 } 938 939 return 0; 940 } else if (bkey_extent_is_inline_data(k.k)) { 941 return fiemap_fill_next_extent(info, 942 bkey_start_offset(k.k) << 9, 943 0, k.k->size << 9, 944 flags| 945 FIEMAP_EXTENT_DATA_INLINE); 946 } else if (k.k->type == KEY_TYPE_reservation) { 947 return fiemap_fill_next_extent(info, 948 bkey_start_offset(k.k) << 9, 949 0, k.k->size << 9, 950 flags| 951 FIEMAP_EXTENT_DELALLOC| 952 FIEMAP_EXTENT_UNWRITTEN); 953 } else { 954 BUG(); 955 } 956 } 957 958 static int bch2_fiemap(struct inode *vinode, struct fiemap_extent_info *info, 959 u64 start, u64 len) 960 { 961 struct bch_fs *c = vinode->i_sb->s_fs_info; 962 struct bch_inode_info *ei = to_bch_ei(vinode); 963 struct btree_trans *trans; 964 struct btree_iter iter; 965 struct bkey_s_c k; 966 struct bkey_buf cur, prev; 967 struct bpos end = POS(ei->v.i_ino, (start + len) >> 9); 968 unsigned offset_into_extent, sectors; 969 bool have_extent = false; 970 u32 snapshot; 971 int ret = 0; 972 973 ret = fiemap_prep(&ei->v, info, start, &len, FIEMAP_FLAG_SYNC); 974 if (ret) 975 return ret; 976 977 if (start + len < start) 978 return -EINVAL; 979 980 start >>= 9; 981 982 bch2_bkey_buf_init(&cur); 983 bch2_bkey_buf_init(&prev); 984 trans = bch2_trans_get(c); 985 retry: 986 bch2_trans_begin(trans); 987 988 ret = bch2_subvolume_get_snapshot(trans, ei->ei_subvol, &snapshot); 989 if (ret) 990 goto err; 991 992 bch2_trans_iter_init(trans, &iter, BTREE_ID_extents, 993 SPOS(ei->v.i_ino, start, snapshot), 0); 994 995 while (!(ret = btree_trans_too_many_iters(trans)) && 996 (k = bch2_btree_iter_peek_upto(&iter, end)).k && 997 !(ret = bkey_err(k))) { 998 enum btree_id data_btree = BTREE_ID_extents; 999 1000 if (!bkey_extent_is_data(k.k) && 1001 k.k->type != KEY_TYPE_reservation) { 1002 bch2_btree_iter_advance(&iter); 1003 continue; 1004 } 1005 1006 offset_into_extent = iter.pos.offset - 1007 bkey_start_offset(k.k); 1008 sectors = k.k->size - offset_into_extent; 1009 1010 bch2_bkey_buf_reassemble(&cur, c, k); 1011 1012 ret = bch2_read_indirect_extent(trans, &data_btree, 1013 &offset_into_extent, &cur); 1014 if (ret) 1015 break; 1016 1017 k = bkey_i_to_s_c(cur.k); 1018 bch2_bkey_buf_realloc(&prev, c, k.k->u64s); 1019 1020 sectors = min(sectors, k.k->size - offset_into_extent); 1021 1022 bch2_cut_front(POS(k.k->p.inode, 1023 bkey_start_offset(k.k) + 1024 offset_into_extent), 1025 cur.k); 1026 bch2_key_resize(&cur.k->k, sectors); 1027 cur.k->k.p = iter.pos; 1028 cur.k->k.p.offset += cur.k->k.size; 1029 1030 if (have_extent) { 1031 bch2_trans_unlock(trans); 1032 ret = bch2_fill_extent(c, info, 1033 bkey_i_to_s_c(prev.k), 0); 1034 if (ret) 1035 break; 1036 } 1037 1038 bkey_copy(prev.k, cur.k); 1039 have_extent = true; 1040 1041 bch2_btree_iter_set_pos(&iter, 1042 POS(iter.pos.inode, iter.pos.offset + sectors)); 1043 } 1044 start = iter.pos.offset; 1045 bch2_trans_iter_exit(trans, &iter); 1046 err: 1047 if (bch2_err_matches(ret, BCH_ERR_transaction_restart)) 1048 goto retry; 1049 1050 if (!ret && have_extent) { 1051 bch2_trans_unlock(trans); 1052 ret = bch2_fill_extent(c, info, bkey_i_to_s_c(prev.k), 1053 FIEMAP_EXTENT_LAST); 1054 } 1055 1056 bch2_trans_put(trans); 1057 bch2_bkey_buf_exit(&cur, c); 1058 bch2_bkey_buf_exit(&prev, c); 1059 return ret < 0 ? ret : 0; 1060 } 1061 1062 static const struct vm_operations_struct bch_vm_ops = { 1063 .fault = bch2_page_fault, 1064 .map_pages = filemap_map_pages, 1065 .page_mkwrite = bch2_page_mkwrite, 1066 }; 1067 1068 static int bch2_mmap(struct file *file, struct vm_area_struct *vma) 1069 { 1070 file_accessed(file); 1071 1072 vma->vm_ops = &bch_vm_ops; 1073 return 0; 1074 } 1075 1076 /* Directories: */ 1077 1078 static loff_t bch2_dir_llseek(struct file *file, loff_t offset, int whence) 1079 { 1080 return generic_file_llseek_size(file, offset, whence, 1081 S64_MAX, S64_MAX); 1082 } 1083 1084 static int bch2_vfs_readdir(struct file *file, struct dir_context *ctx) 1085 { 1086 struct bch_inode_info *inode = file_bch_inode(file); 1087 struct bch_fs *c = inode->v.i_sb->s_fs_info; 1088 1089 if (!dir_emit_dots(file, ctx)) 1090 return 0; 1091 1092 int ret = bch2_readdir(c, inode_inum(inode), ctx); 1093 1094 bch_err_fn(c, ret); 1095 return bch2_err_class(ret); 1096 } 1097 1098 static int bch2_open(struct inode *vinode, struct file *file) 1099 { 1100 if (file->f_flags & (O_WRONLY|O_RDWR)) { 1101 struct bch_inode_info *inode = to_bch_ei(vinode); 1102 struct bch_fs *c = inode->v.i_sb->s_fs_info; 1103 1104 int ret = bch2_subvol_is_ro(c, inode->ei_subvol); 1105 if (ret) 1106 return ret; 1107 } 1108 1109 return generic_file_open(vinode, file); 1110 } 1111 1112 static const struct file_operations bch_file_operations = { 1113 .open = bch2_open, 1114 .llseek = bch2_llseek, 1115 .read_iter = bch2_read_iter, 1116 .write_iter = bch2_write_iter, 1117 .mmap = bch2_mmap, 1118 .fsync = bch2_fsync, 1119 .splice_read = filemap_splice_read, 1120 .splice_write = iter_file_splice_write, 1121 .fallocate = bch2_fallocate_dispatch, 1122 .unlocked_ioctl = bch2_fs_file_ioctl, 1123 #ifdef CONFIG_COMPAT 1124 .compat_ioctl = bch2_compat_fs_ioctl, 1125 #endif 1126 .remap_file_range = bch2_remap_file_range, 1127 }; 1128 1129 static const struct inode_operations bch_file_inode_operations = { 1130 .getattr = bch2_getattr, 1131 .setattr = bch2_setattr, 1132 .fiemap = bch2_fiemap, 1133 .listxattr = bch2_xattr_list, 1134 #ifdef CONFIG_BCACHEFS_POSIX_ACL 1135 .get_acl = bch2_get_acl, 1136 .set_acl = bch2_set_acl, 1137 #endif 1138 }; 1139 1140 static const struct inode_operations bch_dir_inode_operations = { 1141 .lookup = bch2_lookup, 1142 .create = bch2_create, 1143 .link = bch2_link, 1144 .unlink = bch2_unlink, 1145 .symlink = bch2_symlink, 1146 .mkdir = bch2_mkdir, 1147 .rmdir = bch2_unlink, 1148 .mknod = bch2_mknod, 1149 .rename = bch2_rename2, 1150 .getattr = bch2_getattr, 1151 .setattr = bch2_setattr, 1152 .tmpfile = bch2_tmpfile, 1153 .listxattr = bch2_xattr_list, 1154 #ifdef CONFIG_BCACHEFS_POSIX_ACL 1155 .get_acl = bch2_get_acl, 1156 .set_acl = bch2_set_acl, 1157 #endif 1158 }; 1159 1160 static const struct file_operations bch_dir_file_operations = { 1161 .llseek = bch2_dir_llseek, 1162 .read = generic_read_dir, 1163 .iterate_shared = bch2_vfs_readdir, 1164 .fsync = bch2_fsync, 1165 .unlocked_ioctl = bch2_fs_file_ioctl, 1166 #ifdef CONFIG_COMPAT 1167 .compat_ioctl = bch2_compat_fs_ioctl, 1168 #endif 1169 }; 1170 1171 static const struct inode_operations bch_symlink_inode_operations = { 1172 .get_link = page_get_link, 1173 .getattr = bch2_getattr, 1174 .setattr = bch2_setattr, 1175 .listxattr = bch2_xattr_list, 1176 #ifdef CONFIG_BCACHEFS_POSIX_ACL 1177 .get_acl = bch2_get_acl, 1178 .set_acl = bch2_set_acl, 1179 #endif 1180 }; 1181 1182 static const struct inode_operations bch_special_inode_operations = { 1183 .getattr = bch2_getattr, 1184 .setattr = bch2_setattr, 1185 .listxattr = bch2_xattr_list, 1186 #ifdef CONFIG_BCACHEFS_POSIX_ACL 1187 .get_acl = bch2_get_acl, 1188 .set_acl = bch2_set_acl, 1189 #endif 1190 }; 1191 1192 static const struct address_space_operations bch_address_space_operations = { 1193 .read_folio = bch2_read_folio, 1194 .writepages = bch2_writepages, 1195 .readahead = bch2_readahead, 1196 .dirty_folio = filemap_dirty_folio, 1197 .write_begin = bch2_write_begin, 1198 .write_end = bch2_write_end, 1199 .invalidate_folio = bch2_invalidate_folio, 1200 .release_folio = bch2_release_folio, 1201 .direct_IO = noop_direct_IO, 1202 #ifdef CONFIG_MIGRATION 1203 .migrate_folio = filemap_migrate_folio, 1204 #endif 1205 .error_remove_folio = generic_error_remove_folio, 1206 }; 1207 1208 struct bcachefs_fid { 1209 u64 inum; 1210 u32 subvol; 1211 u32 gen; 1212 } __packed; 1213 1214 struct bcachefs_fid_with_parent { 1215 struct bcachefs_fid fid; 1216 struct bcachefs_fid dir; 1217 } __packed; 1218 1219 static int bcachefs_fid_valid(int fh_len, int fh_type) 1220 { 1221 switch (fh_type) { 1222 case FILEID_BCACHEFS_WITHOUT_PARENT: 1223 return fh_len == sizeof(struct bcachefs_fid) / sizeof(u32); 1224 case FILEID_BCACHEFS_WITH_PARENT: 1225 return fh_len == sizeof(struct bcachefs_fid_with_parent) / sizeof(u32); 1226 default: 1227 return false; 1228 } 1229 } 1230 1231 static struct bcachefs_fid bch2_inode_to_fid(struct bch_inode_info *inode) 1232 { 1233 return (struct bcachefs_fid) { 1234 .inum = inode->ei_inode.bi_inum, 1235 .subvol = inode->ei_subvol, 1236 .gen = inode->ei_inode.bi_generation, 1237 }; 1238 } 1239 1240 static int bch2_encode_fh(struct inode *vinode, u32 *fh, int *len, 1241 struct inode *vdir) 1242 { 1243 struct bch_inode_info *inode = to_bch_ei(vinode); 1244 struct bch_inode_info *dir = to_bch_ei(vdir); 1245 int min_len; 1246 1247 if (!S_ISDIR(inode->v.i_mode) && dir) { 1248 struct bcachefs_fid_with_parent *fid = (void *) fh; 1249 1250 min_len = sizeof(*fid) / sizeof(u32); 1251 if (*len < min_len) { 1252 *len = min_len; 1253 return FILEID_INVALID; 1254 } 1255 1256 fid->fid = bch2_inode_to_fid(inode); 1257 fid->dir = bch2_inode_to_fid(dir); 1258 1259 *len = min_len; 1260 return FILEID_BCACHEFS_WITH_PARENT; 1261 } else { 1262 struct bcachefs_fid *fid = (void *) fh; 1263 1264 min_len = sizeof(*fid) / sizeof(u32); 1265 if (*len < min_len) { 1266 *len = min_len; 1267 return FILEID_INVALID; 1268 } 1269 *fid = bch2_inode_to_fid(inode); 1270 1271 *len = min_len; 1272 return FILEID_BCACHEFS_WITHOUT_PARENT; 1273 } 1274 } 1275 1276 static struct inode *bch2_nfs_get_inode(struct super_block *sb, 1277 struct bcachefs_fid fid) 1278 { 1279 struct bch_fs *c = sb->s_fs_info; 1280 struct inode *vinode = bch2_vfs_inode_get(c, (subvol_inum) { 1281 .subvol = fid.subvol, 1282 .inum = fid.inum, 1283 }); 1284 if (!IS_ERR(vinode) && vinode->i_generation != fid.gen) { 1285 iput(vinode); 1286 vinode = ERR_PTR(-ESTALE); 1287 } 1288 return vinode; 1289 } 1290 1291 static struct dentry *bch2_fh_to_dentry(struct super_block *sb, struct fid *_fid, 1292 int fh_len, int fh_type) 1293 { 1294 struct bcachefs_fid *fid = (void *) _fid; 1295 1296 if (!bcachefs_fid_valid(fh_len, fh_type)) 1297 return NULL; 1298 1299 return d_obtain_alias(bch2_nfs_get_inode(sb, *fid)); 1300 } 1301 1302 static struct dentry *bch2_fh_to_parent(struct super_block *sb, struct fid *_fid, 1303 int fh_len, int fh_type) 1304 { 1305 struct bcachefs_fid_with_parent *fid = (void *) _fid; 1306 1307 if (!bcachefs_fid_valid(fh_len, fh_type) || 1308 fh_type != FILEID_BCACHEFS_WITH_PARENT) 1309 return NULL; 1310 1311 return d_obtain_alias(bch2_nfs_get_inode(sb, fid->dir)); 1312 } 1313 1314 static struct dentry *bch2_get_parent(struct dentry *child) 1315 { 1316 struct bch_inode_info *inode = to_bch_ei(child->d_inode); 1317 struct bch_fs *c = inode->v.i_sb->s_fs_info; 1318 subvol_inum parent_inum = { 1319 .subvol = inode->ei_inode.bi_parent_subvol ?: 1320 inode->ei_subvol, 1321 .inum = inode->ei_inode.bi_dir, 1322 }; 1323 1324 return d_obtain_alias(bch2_vfs_inode_get(c, parent_inum)); 1325 } 1326 1327 static int bch2_get_name(struct dentry *parent, char *name, struct dentry *child) 1328 { 1329 struct bch_inode_info *inode = to_bch_ei(child->d_inode); 1330 struct bch_inode_info *dir = to_bch_ei(parent->d_inode); 1331 struct bch_fs *c = inode->v.i_sb->s_fs_info; 1332 struct btree_trans *trans; 1333 struct btree_iter iter1; 1334 struct btree_iter iter2; 1335 struct bkey_s_c k; 1336 struct bkey_s_c_dirent d; 1337 struct bch_inode_unpacked inode_u; 1338 subvol_inum target; 1339 u32 snapshot; 1340 struct qstr dirent_name; 1341 unsigned name_len = 0; 1342 int ret; 1343 1344 if (!S_ISDIR(dir->v.i_mode)) 1345 return -EINVAL; 1346 1347 trans = bch2_trans_get(c); 1348 1349 bch2_trans_iter_init(trans, &iter1, BTREE_ID_dirents, 1350 POS(dir->ei_inode.bi_inum, 0), 0); 1351 bch2_trans_iter_init(trans, &iter2, BTREE_ID_dirents, 1352 POS(dir->ei_inode.bi_inum, 0), 0); 1353 retry: 1354 bch2_trans_begin(trans); 1355 1356 ret = bch2_subvolume_get_snapshot(trans, dir->ei_subvol, &snapshot); 1357 if (ret) 1358 goto err; 1359 1360 bch2_btree_iter_set_snapshot(&iter1, snapshot); 1361 bch2_btree_iter_set_snapshot(&iter2, snapshot); 1362 1363 ret = bch2_inode_find_by_inum_trans(trans, inode_inum(inode), &inode_u); 1364 if (ret) 1365 goto err; 1366 1367 if (inode_u.bi_dir == dir->ei_inode.bi_inum) { 1368 bch2_btree_iter_set_pos(&iter1, POS(inode_u.bi_dir, inode_u.bi_dir_offset)); 1369 1370 k = bch2_btree_iter_peek_slot(&iter1); 1371 ret = bkey_err(k); 1372 if (ret) 1373 goto err; 1374 1375 if (k.k->type != KEY_TYPE_dirent) { 1376 ret = -BCH_ERR_ENOENT_dirent_doesnt_match_inode; 1377 goto err; 1378 } 1379 1380 d = bkey_s_c_to_dirent(k); 1381 ret = bch2_dirent_read_target(trans, inode_inum(dir), d, &target); 1382 if (ret > 0) 1383 ret = -BCH_ERR_ENOENT_dirent_doesnt_match_inode; 1384 if (ret) 1385 goto err; 1386 1387 if (target.subvol == inode->ei_subvol && 1388 target.inum == inode->ei_inode.bi_inum) 1389 goto found; 1390 } else { 1391 /* 1392 * File with multiple hardlinks and our backref is to the wrong 1393 * directory - linear search: 1394 */ 1395 for_each_btree_key_continue_norestart(iter2, 0, k, ret) { 1396 if (k.k->p.inode > dir->ei_inode.bi_inum) 1397 break; 1398 1399 if (k.k->type != KEY_TYPE_dirent) 1400 continue; 1401 1402 d = bkey_s_c_to_dirent(k); 1403 ret = bch2_dirent_read_target(trans, inode_inum(dir), d, &target); 1404 if (ret < 0) 1405 break; 1406 if (ret) 1407 continue; 1408 1409 if (target.subvol == inode->ei_subvol && 1410 target.inum == inode->ei_inode.bi_inum) 1411 goto found; 1412 } 1413 } 1414 1415 ret = -ENOENT; 1416 goto err; 1417 found: 1418 dirent_name = bch2_dirent_get_name(d); 1419 1420 name_len = min_t(unsigned, dirent_name.len, NAME_MAX); 1421 memcpy(name, dirent_name.name, name_len); 1422 name[name_len] = '\0'; 1423 err: 1424 if (bch2_err_matches(ret, BCH_ERR_transaction_restart)) 1425 goto retry; 1426 1427 bch2_trans_iter_exit(trans, &iter1); 1428 bch2_trans_iter_exit(trans, &iter2); 1429 bch2_trans_put(trans); 1430 1431 return ret; 1432 } 1433 1434 static const struct export_operations bch_export_ops = { 1435 .encode_fh = bch2_encode_fh, 1436 .fh_to_dentry = bch2_fh_to_dentry, 1437 .fh_to_parent = bch2_fh_to_parent, 1438 .get_parent = bch2_get_parent, 1439 .get_name = bch2_get_name, 1440 }; 1441 1442 static void bch2_vfs_inode_init(struct btree_trans *trans, subvol_inum inum, 1443 struct bch_inode_info *inode, 1444 struct bch_inode_unpacked *bi, 1445 struct bch_subvolume *subvol) 1446 { 1447 bch2_iget5_set(&inode->v, &inum); 1448 bch2_inode_update_after_write(trans, inode, bi, ~0); 1449 1450 if (BCH_SUBVOLUME_SNAP(subvol)) 1451 set_bit(EI_INODE_SNAPSHOT, &inode->ei_flags); 1452 else 1453 clear_bit(EI_INODE_SNAPSHOT, &inode->ei_flags); 1454 1455 inode->v.i_blocks = bi->bi_sectors; 1456 inode->v.i_ino = bi->bi_inum; 1457 inode->v.i_rdev = bi->bi_dev; 1458 inode->v.i_generation = bi->bi_generation; 1459 inode->v.i_size = bi->bi_size; 1460 1461 inode->ei_flags = 0; 1462 inode->ei_quota_reserved = 0; 1463 inode->ei_qid = bch_qid(bi); 1464 inode->ei_subvol = inum.subvol; 1465 1466 inode->v.i_mapping->a_ops = &bch_address_space_operations; 1467 1468 switch (inode->v.i_mode & S_IFMT) { 1469 case S_IFREG: 1470 inode->v.i_op = &bch_file_inode_operations; 1471 inode->v.i_fop = &bch_file_operations; 1472 break; 1473 case S_IFDIR: 1474 inode->v.i_op = &bch_dir_inode_operations; 1475 inode->v.i_fop = &bch_dir_file_operations; 1476 break; 1477 case S_IFLNK: 1478 inode_nohighmem(&inode->v); 1479 inode->v.i_op = &bch_symlink_inode_operations; 1480 break; 1481 default: 1482 init_special_inode(&inode->v, inode->v.i_mode, inode->v.i_rdev); 1483 inode->v.i_op = &bch_special_inode_operations; 1484 break; 1485 } 1486 1487 mapping_set_large_folios(inode->v.i_mapping); 1488 } 1489 1490 static struct inode *bch2_alloc_inode(struct super_block *sb) 1491 { 1492 struct bch_inode_info *inode; 1493 1494 inode = kmem_cache_alloc(bch2_inode_cache, GFP_NOFS); 1495 if (!inode) 1496 return NULL; 1497 1498 inode_init_once(&inode->v); 1499 mutex_init(&inode->ei_update_lock); 1500 two_state_lock_init(&inode->ei_pagecache_lock); 1501 INIT_LIST_HEAD(&inode->ei_vfs_inode_list); 1502 mutex_init(&inode->ei_quota_lock); 1503 1504 return &inode->v; 1505 } 1506 1507 static void bch2_i_callback(struct rcu_head *head) 1508 { 1509 struct inode *vinode = container_of(head, struct inode, i_rcu); 1510 struct bch_inode_info *inode = to_bch_ei(vinode); 1511 1512 kmem_cache_free(bch2_inode_cache, inode); 1513 } 1514 1515 static void bch2_destroy_inode(struct inode *vinode) 1516 { 1517 call_rcu(&vinode->i_rcu, bch2_i_callback); 1518 } 1519 1520 static int inode_update_times_fn(struct btree_trans *trans, 1521 struct bch_inode_info *inode, 1522 struct bch_inode_unpacked *bi, 1523 void *p) 1524 { 1525 struct bch_fs *c = inode->v.i_sb->s_fs_info; 1526 1527 bi->bi_atime = timespec_to_bch2_time(c, inode_get_atime(&inode->v)); 1528 bi->bi_mtime = timespec_to_bch2_time(c, inode_get_mtime(&inode->v)); 1529 bi->bi_ctime = timespec_to_bch2_time(c, inode_get_ctime(&inode->v)); 1530 1531 return 0; 1532 } 1533 1534 static int bch2_vfs_write_inode(struct inode *vinode, 1535 struct writeback_control *wbc) 1536 { 1537 struct bch_fs *c = vinode->i_sb->s_fs_info; 1538 struct bch_inode_info *inode = to_bch_ei(vinode); 1539 int ret; 1540 1541 mutex_lock(&inode->ei_update_lock); 1542 ret = bch2_write_inode(c, inode, inode_update_times_fn, NULL, 1543 ATTR_ATIME|ATTR_MTIME|ATTR_CTIME); 1544 mutex_unlock(&inode->ei_update_lock); 1545 1546 return bch2_err_class(ret); 1547 } 1548 1549 static void bch2_evict_inode(struct inode *vinode) 1550 { 1551 struct bch_fs *c = vinode->i_sb->s_fs_info; 1552 struct bch_inode_info *inode = to_bch_ei(vinode); 1553 1554 truncate_inode_pages_final(&inode->v.i_data); 1555 1556 clear_inode(&inode->v); 1557 1558 BUG_ON(!is_bad_inode(&inode->v) && inode->ei_quota_reserved); 1559 1560 if (!inode->v.i_nlink && !is_bad_inode(&inode->v)) { 1561 bch2_quota_acct(c, inode->ei_qid, Q_SPC, -((s64) inode->v.i_blocks), 1562 KEY_TYPE_QUOTA_WARN); 1563 bch2_quota_acct(c, inode->ei_qid, Q_INO, -1, 1564 KEY_TYPE_QUOTA_WARN); 1565 bch2_inode_rm(c, inode_inum(inode)); 1566 } 1567 1568 mutex_lock(&c->vfs_inodes_lock); 1569 list_del_init(&inode->ei_vfs_inode_list); 1570 mutex_unlock(&c->vfs_inodes_lock); 1571 } 1572 1573 void bch2_evict_subvolume_inodes(struct bch_fs *c, snapshot_id_list *s) 1574 { 1575 struct bch_inode_info *inode; 1576 DARRAY(struct bch_inode_info *) grabbed; 1577 bool clean_pass = false, this_pass_clean; 1578 1579 /* 1580 * Initially, we scan for inodes without I_DONTCACHE, then mark them to 1581 * be pruned with d_mark_dontcache(). 1582 * 1583 * Once we've had a clean pass where we didn't find any inodes without 1584 * I_DONTCACHE, we wait for them to be freed: 1585 */ 1586 1587 darray_init(&grabbed); 1588 darray_make_room(&grabbed, 1024); 1589 again: 1590 cond_resched(); 1591 this_pass_clean = true; 1592 1593 mutex_lock(&c->vfs_inodes_lock); 1594 list_for_each_entry(inode, &c->vfs_inodes_list, ei_vfs_inode_list) { 1595 if (!snapshot_list_has_id(s, inode->ei_subvol)) 1596 continue; 1597 1598 if (!(inode->v.i_state & I_DONTCACHE) && 1599 !(inode->v.i_state & I_FREEING) && 1600 igrab(&inode->v)) { 1601 this_pass_clean = false; 1602 1603 if (darray_push_gfp(&grabbed, inode, GFP_ATOMIC|__GFP_NOWARN)) { 1604 iput(&inode->v); 1605 break; 1606 } 1607 } else if (clean_pass && this_pass_clean) { 1608 wait_queue_head_t *wq = bit_waitqueue(&inode->v.i_state, __I_NEW); 1609 DEFINE_WAIT_BIT(wait, &inode->v.i_state, __I_NEW); 1610 1611 prepare_to_wait(wq, &wait.wq_entry, TASK_UNINTERRUPTIBLE); 1612 mutex_unlock(&c->vfs_inodes_lock); 1613 1614 schedule(); 1615 finish_wait(wq, &wait.wq_entry); 1616 goto again; 1617 } 1618 } 1619 mutex_unlock(&c->vfs_inodes_lock); 1620 1621 darray_for_each(grabbed, i) { 1622 inode = *i; 1623 d_mark_dontcache(&inode->v); 1624 d_prune_aliases(&inode->v); 1625 iput(&inode->v); 1626 } 1627 grabbed.nr = 0; 1628 1629 if (!clean_pass || !this_pass_clean) { 1630 clean_pass = this_pass_clean; 1631 goto again; 1632 } 1633 1634 darray_exit(&grabbed); 1635 } 1636 1637 static int bch2_statfs(struct dentry *dentry, struct kstatfs *buf) 1638 { 1639 struct super_block *sb = dentry->d_sb; 1640 struct bch_fs *c = sb->s_fs_info; 1641 struct bch_fs_usage_short usage = bch2_fs_usage_read_short(c); 1642 unsigned shift = sb->s_blocksize_bits - 9; 1643 /* 1644 * this assumes inodes take up 64 bytes, which is a decent average 1645 * number: 1646 */ 1647 u64 avail_inodes = ((usage.capacity - usage.used) << 3); 1648 1649 buf->f_type = BCACHEFS_STATFS_MAGIC; 1650 buf->f_bsize = sb->s_blocksize; 1651 buf->f_blocks = usage.capacity >> shift; 1652 buf->f_bfree = usage.free >> shift; 1653 buf->f_bavail = avail_factor(usage.free) >> shift; 1654 1655 buf->f_files = usage.nr_inodes + avail_inodes; 1656 buf->f_ffree = avail_inodes; 1657 1658 buf->f_fsid = uuid_to_fsid(c->sb.user_uuid.b); 1659 buf->f_namelen = BCH_NAME_MAX; 1660 1661 return 0; 1662 } 1663 1664 static int bch2_sync_fs(struct super_block *sb, int wait) 1665 { 1666 struct bch_fs *c = sb->s_fs_info; 1667 int ret; 1668 1669 if (c->opts.journal_flush_disabled) 1670 return 0; 1671 1672 if (!wait) { 1673 bch2_journal_flush_async(&c->journal, NULL); 1674 return 0; 1675 } 1676 1677 ret = bch2_journal_flush(&c->journal); 1678 return bch2_err_class(ret); 1679 } 1680 1681 static struct bch_fs *bch2_path_to_fs(const char *path) 1682 { 1683 struct bch_fs *c; 1684 dev_t dev; 1685 int ret; 1686 1687 ret = lookup_bdev(path, &dev); 1688 if (ret) 1689 return ERR_PTR(ret); 1690 1691 c = bch2_dev_to_fs(dev); 1692 if (c) 1693 closure_put(&c->cl); 1694 return c ?: ERR_PTR(-ENOENT); 1695 } 1696 1697 static int bch2_remount(struct super_block *sb, int *flags, char *data) 1698 { 1699 struct bch_fs *c = sb->s_fs_info; 1700 struct bch_opts opts = bch2_opts_empty(); 1701 int ret; 1702 1703 ret = bch2_parse_mount_opts(c, &opts, data); 1704 if (ret) 1705 goto err; 1706 1707 opt_set(opts, read_only, (*flags & SB_RDONLY) != 0); 1708 1709 if (opts.read_only != c->opts.read_only) { 1710 down_write(&c->state_lock); 1711 1712 if (opts.read_only) { 1713 bch2_fs_read_only(c); 1714 1715 sb->s_flags |= SB_RDONLY; 1716 } else { 1717 ret = bch2_fs_read_write(c); 1718 if (ret) { 1719 bch_err(c, "error going rw: %i", ret); 1720 up_write(&c->state_lock); 1721 ret = -EINVAL; 1722 goto err; 1723 } 1724 1725 sb->s_flags &= ~SB_RDONLY; 1726 } 1727 1728 c->opts.read_only = opts.read_only; 1729 1730 up_write(&c->state_lock); 1731 } 1732 1733 if (opt_defined(opts, errors)) 1734 c->opts.errors = opts.errors; 1735 err: 1736 return bch2_err_class(ret); 1737 } 1738 1739 static int bch2_show_devname(struct seq_file *seq, struct dentry *root) 1740 { 1741 struct bch_fs *c = root->d_sb->s_fs_info; 1742 bool first = true; 1743 1744 for_each_online_member(c, ca) { 1745 if (!first) 1746 seq_putc(seq, ':'); 1747 first = false; 1748 seq_puts(seq, ca->disk_sb.sb_name); 1749 } 1750 1751 return 0; 1752 } 1753 1754 static int bch2_show_options(struct seq_file *seq, struct dentry *root) 1755 { 1756 struct bch_fs *c = root->d_sb->s_fs_info; 1757 enum bch_opt_id i; 1758 struct printbuf buf = PRINTBUF; 1759 int ret = 0; 1760 1761 for (i = 0; i < bch2_opts_nr; i++) { 1762 const struct bch_option *opt = &bch2_opt_table[i]; 1763 u64 v = bch2_opt_get_by_id(&c->opts, i); 1764 1765 if (!(opt->flags & OPT_MOUNT)) 1766 continue; 1767 1768 if (v == bch2_opt_get_by_id(&bch2_opts_default, i)) 1769 continue; 1770 1771 printbuf_reset(&buf); 1772 bch2_opt_to_text(&buf, c, c->disk_sb.sb, opt, v, 1773 OPT_SHOW_MOUNT_STYLE); 1774 seq_putc(seq, ','); 1775 seq_puts(seq, buf.buf); 1776 } 1777 1778 if (buf.allocation_failure) 1779 ret = -ENOMEM; 1780 printbuf_exit(&buf); 1781 return ret; 1782 } 1783 1784 static void bch2_put_super(struct super_block *sb) 1785 { 1786 struct bch_fs *c = sb->s_fs_info; 1787 1788 __bch2_fs_stop(c); 1789 } 1790 1791 /* 1792 * bcachefs doesn't currently integrate intwrite freeze protection but the 1793 * internal write references serve the same purpose. Therefore reuse the 1794 * read-only transition code to perform the quiesce. The caveat is that we don't 1795 * currently have the ability to block tasks that want a write reference while 1796 * the superblock is frozen. This is fine for now, but we should either add 1797 * blocking support or find a way to integrate sb_start_intwrite() and friends. 1798 */ 1799 static int bch2_freeze(struct super_block *sb) 1800 { 1801 struct bch_fs *c = sb->s_fs_info; 1802 1803 down_write(&c->state_lock); 1804 bch2_fs_read_only(c); 1805 up_write(&c->state_lock); 1806 return 0; 1807 } 1808 1809 static int bch2_unfreeze(struct super_block *sb) 1810 { 1811 struct bch_fs *c = sb->s_fs_info; 1812 int ret; 1813 1814 if (test_bit(BCH_FS_emergency_ro, &c->flags)) 1815 return 0; 1816 1817 down_write(&c->state_lock); 1818 ret = bch2_fs_read_write(c); 1819 up_write(&c->state_lock); 1820 return ret; 1821 } 1822 1823 static const struct super_operations bch_super_operations = { 1824 .alloc_inode = bch2_alloc_inode, 1825 .destroy_inode = bch2_destroy_inode, 1826 .write_inode = bch2_vfs_write_inode, 1827 .evict_inode = bch2_evict_inode, 1828 .sync_fs = bch2_sync_fs, 1829 .statfs = bch2_statfs, 1830 .show_devname = bch2_show_devname, 1831 .show_options = bch2_show_options, 1832 .remount_fs = bch2_remount, 1833 .put_super = bch2_put_super, 1834 .freeze_fs = bch2_freeze, 1835 .unfreeze_fs = bch2_unfreeze, 1836 }; 1837 1838 static int bch2_set_super(struct super_block *s, void *data) 1839 { 1840 s->s_fs_info = data; 1841 return 0; 1842 } 1843 1844 static int bch2_noset_super(struct super_block *s, void *data) 1845 { 1846 return -EBUSY; 1847 } 1848 1849 typedef DARRAY(struct bch_fs *) darray_fs; 1850 1851 static int bch2_test_super(struct super_block *s, void *data) 1852 { 1853 struct bch_fs *c = s->s_fs_info; 1854 darray_fs *d = data; 1855 1856 if (!c) 1857 return false; 1858 1859 darray_for_each(*d, i) 1860 if (c != *i) 1861 return false; 1862 return true; 1863 } 1864 1865 static struct dentry *bch2_mount(struct file_system_type *fs_type, 1866 int flags, const char *dev_name, void *data) 1867 { 1868 struct bch_fs *c; 1869 struct super_block *sb; 1870 struct inode *vinode; 1871 struct bch_opts opts = bch2_opts_empty(); 1872 int ret; 1873 1874 opt_set(opts, read_only, (flags & SB_RDONLY) != 0); 1875 1876 ret = bch2_parse_mount_opts(NULL, &opts, data); 1877 if (ret) { 1878 ret = bch2_err_class(ret); 1879 return ERR_PTR(ret); 1880 } 1881 1882 if (!dev_name || strlen(dev_name) == 0) 1883 return ERR_PTR(-EINVAL); 1884 1885 darray_str devs; 1886 ret = bch2_split_devs(dev_name, &devs); 1887 if (ret) 1888 return ERR_PTR(ret); 1889 1890 darray_fs devs_to_fs = {}; 1891 darray_for_each(devs, i) { 1892 ret = darray_push(&devs_to_fs, bch2_path_to_fs(*i)); 1893 if (ret) { 1894 sb = ERR_PTR(ret); 1895 goto got_sb; 1896 } 1897 } 1898 1899 sb = sget(fs_type, bch2_test_super, bch2_noset_super, flags|SB_NOSEC, &devs_to_fs); 1900 if (!IS_ERR(sb)) 1901 goto got_sb; 1902 1903 c = bch2_fs_open(devs.data, devs.nr, opts); 1904 if (IS_ERR(c)) { 1905 sb = ERR_CAST(c); 1906 goto got_sb; 1907 } 1908 1909 /* Some options can't be parsed until after the fs is started: */ 1910 ret = bch2_parse_mount_opts(c, &opts, data); 1911 if (ret) { 1912 bch2_fs_stop(c); 1913 sb = ERR_PTR(ret); 1914 goto got_sb; 1915 } 1916 1917 bch2_opts_apply(&c->opts, opts); 1918 1919 sb = sget(fs_type, NULL, bch2_set_super, flags|SB_NOSEC, c); 1920 if (IS_ERR(sb)) 1921 bch2_fs_stop(c); 1922 got_sb: 1923 darray_exit(&devs_to_fs); 1924 bch2_darray_str_exit(&devs); 1925 1926 if (IS_ERR(sb)) { 1927 ret = PTR_ERR(sb); 1928 ret = bch2_err_class(ret); 1929 return ERR_PTR(ret); 1930 } 1931 1932 c = sb->s_fs_info; 1933 1934 if (sb->s_root) { 1935 if ((flags ^ sb->s_flags) & SB_RDONLY) { 1936 ret = -EBUSY; 1937 goto err_put_super; 1938 } 1939 goto out; 1940 } 1941 1942 sb->s_blocksize = block_bytes(c); 1943 sb->s_blocksize_bits = ilog2(block_bytes(c)); 1944 sb->s_maxbytes = MAX_LFS_FILESIZE; 1945 sb->s_op = &bch_super_operations; 1946 sb->s_export_op = &bch_export_ops; 1947 #ifdef CONFIG_BCACHEFS_QUOTA 1948 sb->s_qcop = &bch2_quotactl_operations; 1949 sb->s_quota_types = QTYPE_MASK_USR|QTYPE_MASK_GRP|QTYPE_MASK_PRJ; 1950 #endif 1951 sb->s_xattr = bch2_xattr_handlers; 1952 sb->s_magic = BCACHEFS_STATFS_MAGIC; 1953 sb->s_time_gran = c->sb.nsec_per_time_unit; 1954 sb->s_time_min = div_s64(S64_MIN, c->sb.time_units_per_sec) + 1; 1955 sb->s_time_max = div_s64(S64_MAX, c->sb.time_units_per_sec); 1956 sb->s_uuid = c->sb.user_uuid; 1957 c->vfs_sb = sb; 1958 strscpy(sb->s_id, c->name, sizeof(sb->s_id)); 1959 1960 ret = super_setup_bdi(sb); 1961 if (ret) 1962 goto err_put_super; 1963 1964 sb->s_bdi->ra_pages = VM_READAHEAD_PAGES; 1965 1966 for_each_online_member(c, ca) { 1967 struct block_device *bdev = ca->disk_sb.bdev; 1968 1969 /* XXX: create an anonymous device for multi device filesystems */ 1970 sb->s_bdev = bdev; 1971 sb->s_dev = bdev->bd_dev; 1972 percpu_ref_put(&ca->io_ref); 1973 break; 1974 } 1975 1976 c->dev = sb->s_dev; 1977 1978 #ifdef CONFIG_BCACHEFS_POSIX_ACL 1979 if (c->opts.acl) 1980 sb->s_flags |= SB_POSIXACL; 1981 #endif 1982 1983 sb->s_shrink->seeks = 0; 1984 1985 vinode = bch2_vfs_inode_get(c, BCACHEFS_ROOT_SUBVOL_INUM); 1986 ret = PTR_ERR_OR_ZERO(vinode); 1987 bch_err_msg(c, ret, "mounting: error getting root inode"); 1988 if (ret) 1989 goto err_put_super; 1990 1991 sb->s_root = d_make_root(vinode); 1992 if (!sb->s_root) { 1993 bch_err(c, "error mounting: error allocating root dentry"); 1994 ret = -ENOMEM; 1995 goto err_put_super; 1996 } 1997 1998 sb->s_flags |= SB_ACTIVE; 1999 out: 2000 return dget(sb->s_root); 2001 2002 err_put_super: 2003 __bch2_fs_stop(c); 2004 deactivate_locked_super(sb); 2005 return ERR_PTR(bch2_err_class(ret)); 2006 } 2007 2008 static void bch2_kill_sb(struct super_block *sb) 2009 { 2010 struct bch_fs *c = sb->s_fs_info; 2011 2012 generic_shutdown_super(sb); 2013 bch2_fs_free(c); 2014 } 2015 2016 static struct file_system_type bcache_fs_type = { 2017 .owner = THIS_MODULE, 2018 .name = "bcachefs", 2019 .mount = bch2_mount, 2020 .kill_sb = bch2_kill_sb, 2021 .fs_flags = FS_REQUIRES_DEV, 2022 }; 2023 2024 MODULE_ALIAS_FS("bcachefs"); 2025 2026 void bch2_vfs_exit(void) 2027 { 2028 unregister_filesystem(&bcache_fs_type); 2029 kmem_cache_destroy(bch2_inode_cache); 2030 } 2031 2032 int __init bch2_vfs_init(void) 2033 { 2034 int ret = -ENOMEM; 2035 2036 bch2_inode_cache = KMEM_CACHE(bch_inode_info, SLAB_RECLAIM_ACCOUNT); 2037 if (!bch2_inode_cache) 2038 goto err; 2039 2040 ret = register_filesystem(&bcache_fs_type); 2041 if (ret) 2042 goto err; 2043 2044 return 0; 2045 err: 2046 bch2_vfs_exit(); 2047 return ret; 2048 } 2049 2050 #endif /* NO_BCACHEFS_FS */ 2051