1 // SPDX-License-Identifier: GPL-2.0 2 #include <linux/ceph/ceph_debug.h> 3 4 #include <linux/spinlock.h> 5 #include <linux/namei.h> 6 #include <linux/slab.h> 7 #include <linux/sched.h> 8 #include <linux/xattr.h> 9 10 #include "super.h" 11 #include "mds_client.h" 12 13 /* 14 * Directory operations: readdir, lookup, create, link, unlink, 15 * rename, etc. 16 */ 17 18 /* 19 * Ceph MDS operations are specified in terms of a base ino and 20 * relative path. Thus, the client can specify an operation on a 21 * specific inode (e.g., a getattr due to fstat(2)), or as a path 22 * relative to, say, the root directory. 23 * 24 * Normally, we limit ourselves to strict inode ops (no path component) 25 * or dentry operations (a single path component relative to an ino). The 26 * exception to this is open_root_dentry(), which will open the mount 27 * point by name. 28 */ 29 30 const struct dentry_operations ceph_dentry_ops; 31 32 static bool __dentry_lease_is_valid(struct ceph_dentry_info *di); 33 static int __dir_lease_try_check(const struct dentry *dentry); 34 35 /* 36 * Initialize ceph dentry state. 37 */ 38 static int ceph_d_init(struct dentry *dentry) 39 { 40 struct ceph_dentry_info *di; 41 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(dentry->d_sb); 42 43 di = kmem_cache_zalloc(ceph_dentry_cachep, GFP_KERNEL); 44 if (!di) 45 return -ENOMEM; /* oh well */ 46 47 di->dentry = dentry; 48 di->lease_session = NULL; 49 di->time = jiffies; 50 dentry->d_fsdata = di; 51 INIT_LIST_HEAD(&di->lease_list); 52 53 atomic64_inc(&mdsc->metric.total_dentries); 54 55 return 0; 56 } 57 58 /* 59 * for f_pos for readdir: 60 * - hash order: 61 * (0xff << 52) | ((24 bits hash) << 28) | 62 * (the nth entry has hash collision); 63 * - frag+name order; 64 * ((frag value) << 28) | (the nth entry in frag); 65 */ 66 #define OFFSET_BITS 28 67 #define OFFSET_MASK ((1 << OFFSET_BITS) - 1) 68 #define HASH_ORDER (0xffull << (OFFSET_BITS + 24)) 69 loff_t ceph_make_fpos(unsigned high, unsigned off, bool hash_order) 70 { 71 loff_t fpos = ((loff_t)high << 28) | (loff_t)off; 72 if (hash_order) 73 fpos |= HASH_ORDER; 74 return fpos; 75 } 76 77 static bool is_hash_order(loff_t p) 78 { 79 return (p & HASH_ORDER) == HASH_ORDER; 80 } 81 82 static unsigned fpos_frag(loff_t p) 83 { 84 return p >> OFFSET_BITS; 85 } 86 87 static unsigned fpos_hash(loff_t p) 88 { 89 return ceph_frag_value(fpos_frag(p)); 90 } 91 92 static unsigned fpos_off(loff_t p) 93 { 94 return p & OFFSET_MASK; 95 } 96 97 static int fpos_cmp(loff_t l, loff_t r) 98 { 99 int v = ceph_frag_compare(fpos_frag(l), fpos_frag(r)); 100 if (v) 101 return v; 102 return (int)(fpos_off(l) - fpos_off(r)); 103 } 104 105 /* 106 * make note of the last dentry we read, so we can 107 * continue at the same lexicographical point, 108 * regardless of what dir changes take place on the 109 * server. 110 */ 111 static int note_last_dentry(struct ceph_dir_file_info *dfi, const char *name, 112 int len, unsigned next_offset) 113 { 114 char *buf = kmalloc(len+1, GFP_KERNEL); 115 if (!buf) 116 return -ENOMEM; 117 kfree(dfi->last_name); 118 dfi->last_name = buf; 119 memcpy(dfi->last_name, name, len); 120 dfi->last_name[len] = 0; 121 dfi->next_offset = next_offset; 122 dout("note_last_dentry '%s'\n", dfi->last_name); 123 return 0; 124 } 125 126 127 static struct dentry * 128 __dcache_find_get_entry(struct dentry *parent, u64 idx, 129 struct ceph_readdir_cache_control *cache_ctl) 130 { 131 struct inode *dir = d_inode(parent); 132 struct dentry *dentry; 133 unsigned idx_mask = (PAGE_SIZE / sizeof(struct dentry *)) - 1; 134 loff_t ptr_pos = idx * sizeof(struct dentry *); 135 pgoff_t ptr_pgoff = ptr_pos >> PAGE_SHIFT; 136 137 if (ptr_pos >= i_size_read(dir)) 138 return NULL; 139 140 if (!cache_ctl->page || ptr_pgoff != page_index(cache_ctl->page)) { 141 ceph_readdir_cache_release(cache_ctl); 142 cache_ctl->page = find_lock_page(&dir->i_data, ptr_pgoff); 143 if (!cache_ctl->page) { 144 dout(" page %lu not found\n", ptr_pgoff); 145 return ERR_PTR(-EAGAIN); 146 } 147 /* reading/filling the cache are serialized by 148 i_rwsem, no need to use page lock */ 149 unlock_page(cache_ctl->page); 150 cache_ctl->dentries = kmap(cache_ctl->page); 151 } 152 153 cache_ctl->index = idx & idx_mask; 154 155 rcu_read_lock(); 156 spin_lock(&parent->d_lock); 157 /* check i_size again here, because empty directory can be 158 * marked as complete while not holding the i_rwsem. */ 159 if (ceph_dir_is_complete_ordered(dir) && ptr_pos < i_size_read(dir)) 160 dentry = cache_ctl->dentries[cache_ctl->index]; 161 else 162 dentry = NULL; 163 spin_unlock(&parent->d_lock); 164 if (dentry && !lockref_get_not_dead(&dentry->d_lockref)) 165 dentry = NULL; 166 rcu_read_unlock(); 167 return dentry ? : ERR_PTR(-EAGAIN); 168 } 169 170 /* 171 * When possible, we try to satisfy a readdir by peeking at the 172 * dcache. We make this work by carefully ordering dentries on 173 * d_child when we initially get results back from the MDS, and 174 * falling back to a "normal" sync readdir if any dentries in the dir 175 * are dropped. 176 * 177 * Complete dir indicates that we have all dentries in the dir. It is 178 * defined IFF we hold CEPH_CAP_FILE_SHARED (which will be revoked by 179 * the MDS if/when the directory is modified). 180 */ 181 static int __dcache_readdir(struct file *file, struct dir_context *ctx, 182 int shared_gen) 183 { 184 struct ceph_dir_file_info *dfi = file->private_data; 185 struct dentry *parent = file->f_path.dentry; 186 struct inode *dir = d_inode(parent); 187 struct dentry *dentry, *last = NULL; 188 struct ceph_dentry_info *di; 189 struct ceph_readdir_cache_control cache_ctl = {}; 190 u64 idx = 0; 191 int err = 0; 192 193 dout("__dcache_readdir %p v%u at %llx\n", dir, (unsigned)shared_gen, ctx->pos); 194 195 /* search start position */ 196 if (ctx->pos > 2) { 197 u64 count = div_u64(i_size_read(dir), sizeof(struct dentry *)); 198 while (count > 0) { 199 u64 step = count >> 1; 200 dentry = __dcache_find_get_entry(parent, idx + step, 201 &cache_ctl); 202 if (!dentry) { 203 /* use linar search */ 204 idx = 0; 205 break; 206 } 207 if (IS_ERR(dentry)) { 208 err = PTR_ERR(dentry); 209 goto out; 210 } 211 di = ceph_dentry(dentry); 212 spin_lock(&dentry->d_lock); 213 if (fpos_cmp(di->offset, ctx->pos) < 0) { 214 idx += step + 1; 215 count -= step + 1; 216 } else { 217 count = step; 218 } 219 spin_unlock(&dentry->d_lock); 220 dput(dentry); 221 } 222 223 dout("__dcache_readdir %p cache idx %llu\n", dir, idx); 224 } 225 226 227 for (;;) { 228 bool emit_dentry = false; 229 dentry = __dcache_find_get_entry(parent, idx++, &cache_ctl); 230 if (!dentry) { 231 dfi->file_info.flags |= CEPH_F_ATEND; 232 err = 0; 233 break; 234 } 235 if (IS_ERR(dentry)) { 236 err = PTR_ERR(dentry); 237 goto out; 238 } 239 240 spin_lock(&dentry->d_lock); 241 di = ceph_dentry(dentry); 242 if (d_unhashed(dentry) || 243 d_really_is_negative(dentry) || 244 di->lease_shared_gen != shared_gen) { 245 spin_unlock(&dentry->d_lock); 246 dput(dentry); 247 err = -EAGAIN; 248 goto out; 249 } 250 if (fpos_cmp(ctx->pos, di->offset) <= 0) { 251 __ceph_dentry_dir_lease_touch(di); 252 emit_dentry = true; 253 } 254 spin_unlock(&dentry->d_lock); 255 256 if (emit_dentry) { 257 dout(" %llx dentry %p %pd %p\n", di->offset, 258 dentry, dentry, d_inode(dentry)); 259 ctx->pos = di->offset; 260 if (!dir_emit(ctx, dentry->d_name.name, 261 dentry->d_name.len, ceph_present_inode(d_inode(dentry)), 262 d_inode(dentry)->i_mode >> 12)) { 263 dput(dentry); 264 err = 0; 265 break; 266 } 267 ctx->pos++; 268 269 if (last) 270 dput(last); 271 last = dentry; 272 } else { 273 dput(dentry); 274 } 275 } 276 out: 277 ceph_readdir_cache_release(&cache_ctl); 278 if (last) { 279 int ret; 280 di = ceph_dentry(last); 281 ret = note_last_dentry(dfi, last->d_name.name, last->d_name.len, 282 fpos_off(di->offset) + 1); 283 if (ret < 0) 284 err = ret; 285 dput(last); 286 /* last_name no longer match cache index */ 287 if (dfi->readdir_cache_idx >= 0) { 288 dfi->readdir_cache_idx = -1; 289 dfi->dir_release_count = 0; 290 } 291 } 292 return err; 293 } 294 295 static bool need_send_readdir(struct ceph_dir_file_info *dfi, loff_t pos) 296 { 297 if (!dfi->last_readdir) 298 return true; 299 if (is_hash_order(pos)) 300 return !ceph_frag_contains_value(dfi->frag, fpos_hash(pos)); 301 else 302 return dfi->frag != fpos_frag(pos); 303 } 304 305 static int ceph_readdir(struct file *file, struct dir_context *ctx) 306 { 307 struct ceph_dir_file_info *dfi = file->private_data; 308 struct inode *inode = file_inode(file); 309 struct ceph_inode_info *ci = ceph_inode(inode); 310 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 311 struct ceph_mds_client *mdsc = fsc->mdsc; 312 int i; 313 int err; 314 unsigned frag = -1; 315 struct ceph_mds_reply_info_parsed *rinfo; 316 317 dout("readdir %p file %p pos %llx\n", inode, file, ctx->pos); 318 if (dfi->file_info.flags & CEPH_F_ATEND) 319 return 0; 320 321 /* always start with . and .. */ 322 if (ctx->pos == 0) { 323 dout("readdir off 0 -> '.'\n"); 324 if (!dir_emit(ctx, ".", 1, ceph_present_inode(inode), 325 inode->i_mode >> 12)) 326 return 0; 327 ctx->pos = 1; 328 } 329 if (ctx->pos == 1) { 330 u64 ino; 331 struct dentry *dentry = file->f_path.dentry; 332 333 spin_lock(&dentry->d_lock); 334 ino = ceph_present_inode(dentry->d_parent->d_inode); 335 spin_unlock(&dentry->d_lock); 336 337 dout("readdir off 1 -> '..'\n"); 338 if (!dir_emit(ctx, "..", 2, ino, inode->i_mode >> 12)) 339 return 0; 340 ctx->pos = 2; 341 } 342 343 spin_lock(&ci->i_ceph_lock); 344 /* request Fx cap. if have Fx, we don't need to release Fs cap 345 * for later create/unlink. */ 346 __ceph_touch_fmode(ci, mdsc, CEPH_FILE_MODE_WR); 347 /* can we use the dcache? */ 348 if (ceph_test_mount_opt(fsc, DCACHE) && 349 !ceph_test_mount_opt(fsc, NOASYNCREADDIR) && 350 ceph_snap(inode) != CEPH_SNAPDIR && 351 __ceph_dir_is_complete_ordered(ci) && 352 __ceph_caps_issued_mask_metric(ci, CEPH_CAP_FILE_SHARED, 1)) { 353 int shared_gen = atomic_read(&ci->i_shared_gen); 354 355 spin_unlock(&ci->i_ceph_lock); 356 err = __dcache_readdir(file, ctx, shared_gen); 357 if (err != -EAGAIN) 358 return err; 359 } else { 360 spin_unlock(&ci->i_ceph_lock); 361 } 362 363 /* proceed with a normal readdir */ 364 more: 365 /* do we have the correct frag content buffered? */ 366 if (need_send_readdir(dfi, ctx->pos)) { 367 struct ceph_mds_request *req; 368 int op = ceph_snap(inode) == CEPH_SNAPDIR ? 369 CEPH_MDS_OP_LSSNAP : CEPH_MDS_OP_READDIR; 370 371 /* discard old result, if any */ 372 if (dfi->last_readdir) { 373 ceph_mdsc_put_request(dfi->last_readdir); 374 dfi->last_readdir = NULL; 375 } 376 377 if (is_hash_order(ctx->pos)) { 378 /* fragtree isn't always accurate. choose frag 379 * based on previous reply when possible. */ 380 if (frag == (unsigned)-1) 381 frag = ceph_choose_frag(ci, fpos_hash(ctx->pos), 382 NULL, NULL); 383 } else { 384 frag = fpos_frag(ctx->pos); 385 } 386 387 dout("readdir fetching %llx.%llx frag %x offset '%s'\n", 388 ceph_vinop(inode), frag, dfi->last_name); 389 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); 390 if (IS_ERR(req)) 391 return PTR_ERR(req); 392 err = ceph_alloc_readdir_reply_buffer(req, inode); 393 if (err) { 394 ceph_mdsc_put_request(req); 395 return err; 396 } 397 /* hints to request -> mds selection code */ 398 req->r_direct_mode = USE_AUTH_MDS; 399 if (op == CEPH_MDS_OP_READDIR) { 400 req->r_direct_hash = ceph_frag_value(frag); 401 __set_bit(CEPH_MDS_R_DIRECT_IS_HASH, &req->r_req_flags); 402 req->r_inode_drop = CEPH_CAP_FILE_EXCL; 403 } 404 if (dfi->last_name) { 405 req->r_path2 = kstrdup(dfi->last_name, GFP_KERNEL); 406 if (!req->r_path2) { 407 ceph_mdsc_put_request(req); 408 return -ENOMEM; 409 } 410 } else if (is_hash_order(ctx->pos)) { 411 req->r_args.readdir.offset_hash = 412 cpu_to_le32(fpos_hash(ctx->pos)); 413 } 414 415 req->r_dir_release_cnt = dfi->dir_release_count; 416 req->r_dir_ordered_cnt = dfi->dir_ordered_count; 417 req->r_readdir_cache_idx = dfi->readdir_cache_idx; 418 req->r_readdir_offset = dfi->next_offset; 419 req->r_args.readdir.frag = cpu_to_le32(frag); 420 req->r_args.readdir.flags = 421 cpu_to_le16(CEPH_READDIR_REPLY_BITFLAGS); 422 423 req->r_inode = inode; 424 ihold(inode); 425 req->r_dentry = dget(file->f_path.dentry); 426 err = ceph_mdsc_do_request(mdsc, NULL, req); 427 if (err < 0) { 428 ceph_mdsc_put_request(req); 429 return err; 430 } 431 dout("readdir got and parsed readdir result=%d on " 432 "frag %x, end=%d, complete=%d, hash_order=%d\n", 433 err, frag, 434 (int)req->r_reply_info.dir_end, 435 (int)req->r_reply_info.dir_complete, 436 (int)req->r_reply_info.hash_order); 437 438 rinfo = &req->r_reply_info; 439 if (le32_to_cpu(rinfo->dir_dir->frag) != frag) { 440 frag = le32_to_cpu(rinfo->dir_dir->frag); 441 if (!rinfo->hash_order) { 442 dfi->next_offset = req->r_readdir_offset; 443 /* adjust ctx->pos to beginning of frag */ 444 ctx->pos = ceph_make_fpos(frag, 445 dfi->next_offset, 446 false); 447 } 448 } 449 450 dfi->frag = frag; 451 dfi->last_readdir = req; 452 453 if (test_bit(CEPH_MDS_R_DID_PREPOPULATE, &req->r_req_flags)) { 454 dfi->readdir_cache_idx = req->r_readdir_cache_idx; 455 if (dfi->readdir_cache_idx < 0) { 456 /* preclude from marking dir ordered */ 457 dfi->dir_ordered_count = 0; 458 } else if (ceph_frag_is_leftmost(frag) && 459 dfi->next_offset == 2) { 460 /* note dir version at start of readdir so 461 * we can tell if any dentries get dropped */ 462 dfi->dir_release_count = req->r_dir_release_cnt; 463 dfi->dir_ordered_count = req->r_dir_ordered_cnt; 464 } 465 } else { 466 dout("readdir !did_prepopulate\n"); 467 /* disable readdir cache */ 468 dfi->readdir_cache_idx = -1; 469 /* preclude from marking dir complete */ 470 dfi->dir_release_count = 0; 471 } 472 473 /* note next offset and last dentry name */ 474 if (rinfo->dir_nr > 0) { 475 struct ceph_mds_reply_dir_entry *rde = 476 rinfo->dir_entries + (rinfo->dir_nr-1); 477 unsigned next_offset = req->r_reply_info.dir_end ? 478 2 : (fpos_off(rde->offset) + 1); 479 err = note_last_dentry(dfi, rde->name, rde->name_len, 480 next_offset); 481 if (err) { 482 ceph_mdsc_put_request(dfi->last_readdir); 483 dfi->last_readdir = NULL; 484 return err; 485 } 486 } else if (req->r_reply_info.dir_end) { 487 dfi->next_offset = 2; 488 /* keep last name */ 489 } 490 } 491 492 rinfo = &dfi->last_readdir->r_reply_info; 493 dout("readdir frag %x num %d pos %llx chunk first %llx\n", 494 dfi->frag, rinfo->dir_nr, ctx->pos, 495 rinfo->dir_nr ? rinfo->dir_entries[0].offset : 0LL); 496 497 i = 0; 498 /* search start position */ 499 if (rinfo->dir_nr > 0) { 500 int step, nr = rinfo->dir_nr; 501 while (nr > 0) { 502 step = nr >> 1; 503 if (rinfo->dir_entries[i + step].offset < ctx->pos) { 504 i += step + 1; 505 nr -= step + 1; 506 } else { 507 nr = step; 508 } 509 } 510 } 511 for (; i < rinfo->dir_nr; i++) { 512 struct ceph_mds_reply_dir_entry *rde = rinfo->dir_entries + i; 513 514 BUG_ON(rde->offset < ctx->pos); 515 516 ctx->pos = rde->offset; 517 dout("readdir (%d/%d) -> %llx '%.*s' %p\n", 518 i, rinfo->dir_nr, ctx->pos, 519 rde->name_len, rde->name, &rde->inode.in); 520 521 BUG_ON(!rde->inode.in); 522 523 if (!dir_emit(ctx, rde->name, rde->name_len, 524 ceph_present_ino(inode->i_sb, le64_to_cpu(rde->inode.in->ino)), 525 le32_to_cpu(rde->inode.in->mode) >> 12)) { 526 /* 527 * NOTE: Here no need to put the 'dfi->last_readdir', 528 * because when dir_emit stops us it's most likely 529 * doesn't have enough memory, etc. So for next readdir 530 * it will continue. 531 */ 532 dout("filldir stopping us...\n"); 533 return 0; 534 } 535 ctx->pos++; 536 } 537 538 ceph_mdsc_put_request(dfi->last_readdir); 539 dfi->last_readdir = NULL; 540 541 if (dfi->next_offset > 2) { 542 frag = dfi->frag; 543 goto more; 544 } 545 546 /* more frags? */ 547 if (!ceph_frag_is_rightmost(dfi->frag)) { 548 frag = ceph_frag_next(dfi->frag); 549 if (is_hash_order(ctx->pos)) { 550 loff_t new_pos = ceph_make_fpos(ceph_frag_value(frag), 551 dfi->next_offset, true); 552 if (new_pos > ctx->pos) 553 ctx->pos = new_pos; 554 /* keep last_name */ 555 } else { 556 ctx->pos = ceph_make_fpos(frag, dfi->next_offset, 557 false); 558 kfree(dfi->last_name); 559 dfi->last_name = NULL; 560 } 561 dout("readdir next frag is %x\n", frag); 562 goto more; 563 } 564 dfi->file_info.flags |= CEPH_F_ATEND; 565 566 /* 567 * if dir_release_count still matches the dir, no dentries 568 * were released during the whole readdir, and we should have 569 * the complete dir contents in our cache. 570 */ 571 if (atomic64_read(&ci->i_release_count) == 572 dfi->dir_release_count) { 573 spin_lock(&ci->i_ceph_lock); 574 if (dfi->dir_ordered_count == 575 atomic64_read(&ci->i_ordered_count)) { 576 dout(" marking %p complete and ordered\n", inode); 577 /* use i_size to track number of entries in 578 * readdir cache */ 579 BUG_ON(dfi->readdir_cache_idx < 0); 580 i_size_write(inode, dfi->readdir_cache_idx * 581 sizeof(struct dentry*)); 582 } else { 583 dout(" marking %p complete\n", inode); 584 } 585 __ceph_dir_set_complete(ci, dfi->dir_release_count, 586 dfi->dir_ordered_count); 587 spin_unlock(&ci->i_ceph_lock); 588 } 589 590 dout("readdir %p file %p done.\n", inode, file); 591 return 0; 592 } 593 594 static void reset_readdir(struct ceph_dir_file_info *dfi) 595 { 596 if (dfi->last_readdir) { 597 ceph_mdsc_put_request(dfi->last_readdir); 598 dfi->last_readdir = NULL; 599 } 600 kfree(dfi->last_name); 601 dfi->last_name = NULL; 602 dfi->dir_release_count = 0; 603 dfi->readdir_cache_idx = -1; 604 dfi->next_offset = 2; /* compensate for . and .. */ 605 dfi->file_info.flags &= ~CEPH_F_ATEND; 606 } 607 608 /* 609 * discard buffered readdir content on seekdir(0), or seek to new frag, 610 * or seek prior to current chunk 611 */ 612 static bool need_reset_readdir(struct ceph_dir_file_info *dfi, loff_t new_pos) 613 { 614 struct ceph_mds_reply_info_parsed *rinfo; 615 loff_t chunk_offset; 616 if (new_pos == 0) 617 return true; 618 if (is_hash_order(new_pos)) { 619 /* no need to reset last_name for a forward seek when 620 * dentries are sotred in hash order */ 621 } else if (dfi->frag != fpos_frag(new_pos)) { 622 return true; 623 } 624 rinfo = dfi->last_readdir ? &dfi->last_readdir->r_reply_info : NULL; 625 if (!rinfo || !rinfo->dir_nr) 626 return true; 627 chunk_offset = rinfo->dir_entries[0].offset; 628 return new_pos < chunk_offset || 629 is_hash_order(new_pos) != is_hash_order(chunk_offset); 630 } 631 632 static loff_t ceph_dir_llseek(struct file *file, loff_t offset, int whence) 633 { 634 struct ceph_dir_file_info *dfi = file->private_data; 635 struct inode *inode = file->f_mapping->host; 636 loff_t retval; 637 638 inode_lock(inode); 639 retval = -EINVAL; 640 switch (whence) { 641 case SEEK_CUR: 642 offset += file->f_pos; 643 break; 644 case SEEK_SET: 645 break; 646 case SEEK_END: 647 retval = -EOPNOTSUPP; 648 goto out; 649 default: 650 goto out; 651 } 652 653 if (offset >= 0) { 654 if (need_reset_readdir(dfi, offset)) { 655 dout("dir_llseek dropping %p content\n", file); 656 reset_readdir(dfi); 657 } else if (is_hash_order(offset) && offset > file->f_pos) { 658 /* for hash offset, we don't know if a forward seek 659 * is within same frag */ 660 dfi->dir_release_count = 0; 661 dfi->readdir_cache_idx = -1; 662 } 663 664 if (offset != file->f_pos) { 665 file->f_pos = offset; 666 file->f_version = 0; 667 dfi->file_info.flags &= ~CEPH_F_ATEND; 668 } 669 retval = offset; 670 } 671 out: 672 inode_unlock(inode); 673 return retval; 674 } 675 676 /* 677 * Handle lookups for the hidden .snap directory. 678 */ 679 struct dentry *ceph_handle_snapdir(struct ceph_mds_request *req, 680 struct dentry *dentry) 681 { 682 struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb); 683 struct inode *parent = d_inode(dentry->d_parent); /* we hold i_rwsem */ 684 685 /* .snap dir? */ 686 if (ceph_snap(parent) == CEPH_NOSNAP && 687 strcmp(dentry->d_name.name, fsc->mount_options->snapdir_name) == 0) { 688 struct dentry *res; 689 struct inode *inode = ceph_get_snapdir(parent); 690 691 res = d_splice_alias(inode, dentry); 692 dout("ENOENT on snapdir %p '%pd', linking to snapdir %p. Spliced dentry %p\n", 693 dentry, dentry, inode, res); 694 if (res) 695 dentry = res; 696 } 697 return dentry; 698 } 699 700 /* 701 * Figure out final result of a lookup/open request. 702 * 703 * Mainly, make sure we return the final req->r_dentry (if it already 704 * existed) in place of the original VFS-provided dentry when they 705 * differ. 706 * 707 * Gracefully handle the case where the MDS replies with -ENOENT and 708 * no trace (which it may do, at its discretion, e.g., if it doesn't 709 * care to issue a lease on the negative dentry). 710 */ 711 struct dentry *ceph_finish_lookup(struct ceph_mds_request *req, 712 struct dentry *dentry, int err) 713 { 714 if (err == -ENOENT) { 715 /* no trace? */ 716 err = 0; 717 if (!req->r_reply_info.head->is_dentry) { 718 dout("ENOENT and no trace, dentry %p inode %p\n", 719 dentry, d_inode(dentry)); 720 if (d_really_is_positive(dentry)) { 721 d_drop(dentry); 722 err = -ENOENT; 723 } else { 724 d_add(dentry, NULL); 725 } 726 } 727 } 728 if (err) 729 dentry = ERR_PTR(err); 730 else if (dentry != req->r_dentry) 731 dentry = dget(req->r_dentry); /* we got spliced */ 732 else 733 dentry = NULL; 734 return dentry; 735 } 736 737 static bool is_root_ceph_dentry(struct inode *inode, struct dentry *dentry) 738 { 739 return ceph_ino(inode) == CEPH_INO_ROOT && 740 strncmp(dentry->d_name.name, ".ceph", 5) == 0; 741 } 742 743 /* 744 * Look up a single dir entry. If there is a lookup intent, inform 745 * the MDS so that it gets our 'caps wanted' value in a single op. 746 */ 747 static struct dentry *ceph_lookup(struct inode *dir, struct dentry *dentry, 748 unsigned int flags) 749 { 750 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); 751 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(dir->i_sb); 752 struct ceph_mds_request *req; 753 int op; 754 int mask; 755 int err; 756 757 dout("lookup %p dentry %p '%pd'\n", 758 dir, dentry, dentry); 759 760 if (dentry->d_name.len > NAME_MAX) 761 return ERR_PTR(-ENAMETOOLONG); 762 763 /* can we conclude ENOENT locally? */ 764 if (d_really_is_negative(dentry)) { 765 struct ceph_inode_info *ci = ceph_inode(dir); 766 struct ceph_dentry_info *di = ceph_dentry(dentry); 767 768 spin_lock(&ci->i_ceph_lock); 769 dout(" dir %p flags are 0x%lx\n", dir, ci->i_ceph_flags); 770 if (strncmp(dentry->d_name.name, 771 fsc->mount_options->snapdir_name, 772 dentry->d_name.len) && 773 !is_root_ceph_dentry(dir, dentry) && 774 ceph_test_mount_opt(fsc, DCACHE) && 775 __ceph_dir_is_complete(ci) && 776 __ceph_caps_issued_mask_metric(ci, CEPH_CAP_FILE_SHARED, 1)) { 777 __ceph_touch_fmode(ci, mdsc, CEPH_FILE_MODE_RD); 778 spin_unlock(&ci->i_ceph_lock); 779 dout(" dir %p complete, -ENOENT\n", dir); 780 d_add(dentry, NULL); 781 di->lease_shared_gen = atomic_read(&ci->i_shared_gen); 782 return NULL; 783 } 784 spin_unlock(&ci->i_ceph_lock); 785 } 786 787 op = ceph_snap(dir) == CEPH_SNAPDIR ? 788 CEPH_MDS_OP_LOOKUPSNAP : CEPH_MDS_OP_LOOKUP; 789 req = ceph_mdsc_create_request(mdsc, op, USE_ANY_MDS); 790 if (IS_ERR(req)) 791 return ERR_CAST(req); 792 req->r_dentry = dget(dentry); 793 req->r_num_caps = 2; 794 795 mask = CEPH_STAT_CAP_INODE | CEPH_CAP_AUTH_SHARED; 796 if (ceph_security_xattr_wanted(dir)) 797 mask |= CEPH_CAP_XATTR_SHARED; 798 req->r_args.getattr.mask = cpu_to_le32(mask); 799 800 ihold(dir); 801 req->r_parent = dir; 802 set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags); 803 err = ceph_mdsc_do_request(mdsc, NULL, req); 804 if (err == -ENOENT) { 805 struct dentry *res; 806 807 res = ceph_handle_snapdir(req, dentry); 808 if (IS_ERR(res)) { 809 err = PTR_ERR(res); 810 } else { 811 dentry = res; 812 err = 0; 813 } 814 } 815 dentry = ceph_finish_lookup(req, dentry, err); 816 ceph_mdsc_put_request(req); /* will dput(dentry) */ 817 dout("lookup result=%p\n", dentry); 818 return dentry; 819 } 820 821 /* 822 * If we do a create but get no trace back from the MDS, follow up with 823 * a lookup (the VFS expects us to link up the provided dentry). 824 */ 825 int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry) 826 { 827 struct dentry *result = ceph_lookup(dir, dentry, 0); 828 829 if (result && !IS_ERR(result)) { 830 /* 831 * We created the item, then did a lookup, and found 832 * it was already linked to another inode we already 833 * had in our cache (and thus got spliced). To not 834 * confuse VFS (especially when inode is a directory), 835 * we don't link our dentry to that inode, return an 836 * error instead. 837 * 838 * This event should be rare and it happens only when 839 * we talk to old MDS. Recent MDS does not send traceless 840 * reply for request that creates new inode. 841 */ 842 d_drop(result); 843 return -ESTALE; 844 } 845 return PTR_ERR(result); 846 } 847 848 static int ceph_mknod(struct user_namespace *mnt_userns, struct inode *dir, 849 struct dentry *dentry, umode_t mode, dev_t rdev) 850 { 851 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(dir->i_sb); 852 struct ceph_mds_request *req; 853 struct ceph_acl_sec_ctx as_ctx = {}; 854 int err; 855 856 if (ceph_snap(dir) != CEPH_NOSNAP) 857 return -EROFS; 858 859 err = ceph_wait_on_conflict_unlink(dentry); 860 if (err) 861 return err; 862 863 if (ceph_quota_is_max_files_exceeded(dir)) { 864 err = -EDQUOT; 865 goto out; 866 } 867 868 err = ceph_pre_init_acls(dir, &mode, &as_ctx); 869 if (err < 0) 870 goto out; 871 err = ceph_security_init_secctx(dentry, mode, &as_ctx); 872 if (err < 0) 873 goto out; 874 875 dout("mknod in dir %p dentry %p mode 0%ho rdev %d\n", 876 dir, dentry, mode, rdev); 877 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_MKNOD, USE_AUTH_MDS); 878 if (IS_ERR(req)) { 879 err = PTR_ERR(req); 880 goto out; 881 } 882 req->r_dentry = dget(dentry); 883 req->r_num_caps = 2; 884 req->r_parent = dir; 885 ihold(dir); 886 set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags); 887 req->r_args.mknod.mode = cpu_to_le32(mode); 888 req->r_args.mknod.rdev = cpu_to_le32(rdev); 889 req->r_dentry_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_AUTH_EXCL; 890 req->r_dentry_unless = CEPH_CAP_FILE_EXCL; 891 if (as_ctx.pagelist) { 892 req->r_pagelist = as_ctx.pagelist; 893 as_ctx.pagelist = NULL; 894 } 895 err = ceph_mdsc_do_request(mdsc, dir, req); 896 if (!err && !req->r_reply_info.head->is_dentry) 897 err = ceph_handle_notrace_create(dir, dentry); 898 ceph_mdsc_put_request(req); 899 out: 900 if (!err) 901 ceph_init_inode_acls(d_inode(dentry), &as_ctx); 902 else 903 d_drop(dentry); 904 ceph_release_acl_sec_ctx(&as_ctx); 905 return err; 906 } 907 908 static int ceph_create(struct mnt_idmap *idmap, struct inode *dir, 909 struct dentry *dentry, umode_t mode, bool excl) 910 { 911 struct user_namespace *mnt_userns = mnt_idmap_owner(idmap); 912 return ceph_mknod(mnt_userns, dir, dentry, mode, 0); 913 } 914 915 static int ceph_symlink(struct user_namespace *mnt_userns, struct inode *dir, 916 struct dentry *dentry, const char *dest) 917 { 918 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(dir->i_sb); 919 struct ceph_mds_request *req; 920 struct ceph_acl_sec_ctx as_ctx = {}; 921 int err; 922 923 if (ceph_snap(dir) != CEPH_NOSNAP) 924 return -EROFS; 925 926 err = ceph_wait_on_conflict_unlink(dentry); 927 if (err) 928 return err; 929 930 if (ceph_quota_is_max_files_exceeded(dir)) { 931 err = -EDQUOT; 932 goto out; 933 } 934 935 err = ceph_security_init_secctx(dentry, S_IFLNK | 0777, &as_ctx); 936 if (err < 0) 937 goto out; 938 939 dout("symlink in dir %p dentry %p to '%s'\n", dir, dentry, dest); 940 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SYMLINK, USE_AUTH_MDS); 941 if (IS_ERR(req)) { 942 err = PTR_ERR(req); 943 goto out; 944 } 945 req->r_path2 = kstrdup(dest, GFP_KERNEL); 946 if (!req->r_path2) { 947 err = -ENOMEM; 948 ceph_mdsc_put_request(req); 949 goto out; 950 } 951 req->r_parent = dir; 952 ihold(dir); 953 954 set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags); 955 req->r_dentry = dget(dentry); 956 req->r_num_caps = 2; 957 req->r_dentry_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_AUTH_EXCL; 958 req->r_dentry_unless = CEPH_CAP_FILE_EXCL; 959 if (as_ctx.pagelist) { 960 req->r_pagelist = as_ctx.pagelist; 961 as_ctx.pagelist = NULL; 962 } 963 err = ceph_mdsc_do_request(mdsc, dir, req); 964 if (!err && !req->r_reply_info.head->is_dentry) 965 err = ceph_handle_notrace_create(dir, dentry); 966 ceph_mdsc_put_request(req); 967 out: 968 if (err) 969 d_drop(dentry); 970 ceph_release_acl_sec_ctx(&as_ctx); 971 return err; 972 } 973 974 static int ceph_mkdir(struct user_namespace *mnt_userns, struct inode *dir, 975 struct dentry *dentry, umode_t mode) 976 { 977 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(dir->i_sb); 978 struct ceph_mds_request *req; 979 struct ceph_acl_sec_ctx as_ctx = {}; 980 int err; 981 int op; 982 983 err = ceph_wait_on_conflict_unlink(dentry); 984 if (err) 985 return err; 986 987 if (ceph_snap(dir) == CEPH_SNAPDIR) { 988 /* mkdir .snap/foo is a MKSNAP */ 989 op = CEPH_MDS_OP_MKSNAP; 990 dout("mksnap dir %p snap '%pd' dn %p\n", dir, 991 dentry, dentry); 992 } else if (ceph_snap(dir) == CEPH_NOSNAP) { 993 dout("mkdir dir %p dn %p mode 0%ho\n", dir, dentry, mode); 994 op = CEPH_MDS_OP_MKDIR; 995 } else { 996 err = -EROFS; 997 goto out; 998 } 999 1000 if (op == CEPH_MDS_OP_MKDIR && 1001 ceph_quota_is_max_files_exceeded(dir)) { 1002 err = -EDQUOT; 1003 goto out; 1004 } 1005 1006 mode |= S_IFDIR; 1007 err = ceph_pre_init_acls(dir, &mode, &as_ctx); 1008 if (err < 0) 1009 goto out; 1010 err = ceph_security_init_secctx(dentry, mode, &as_ctx); 1011 if (err < 0) 1012 goto out; 1013 1014 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); 1015 if (IS_ERR(req)) { 1016 err = PTR_ERR(req); 1017 goto out; 1018 } 1019 1020 req->r_dentry = dget(dentry); 1021 req->r_num_caps = 2; 1022 req->r_parent = dir; 1023 ihold(dir); 1024 set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags); 1025 req->r_args.mkdir.mode = cpu_to_le32(mode); 1026 req->r_dentry_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_AUTH_EXCL; 1027 req->r_dentry_unless = CEPH_CAP_FILE_EXCL; 1028 if (as_ctx.pagelist) { 1029 req->r_pagelist = as_ctx.pagelist; 1030 as_ctx.pagelist = NULL; 1031 } 1032 err = ceph_mdsc_do_request(mdsc, dir, req); 1033 if (!err && 1034 !req->r_reply_info.head->is_target && 1035 !req->r_reply_info.head->is_dentry) 1036 err = ceph_handle_notrace_create(dir, dentry); 1037 ceph_mdsc_put_request(req); 1038 out: 1039 if (!err) 1040 ceph_init_inode_acls(d_inode(dentry), &as_ctx); 1041 else 1042 d_drop(dentry); 1043 ceph_release_acl_sec_ctx(&as_ctx); 1044 return err; 1045 } 1046 1047 static int ceph_link(struct dentry *old_dentry, struct inode *dir, 1048 struct dentry *dentry) 1049 { 1050 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(dir->i_sb); 1051 struct ceph_mds_request *req; 1052 int err; 1053 1054 err = ceph_wait_on_conflict_unlink(dentry); 1055 if (err) 1056 return err; 1057 1058 if (ceph_snap(dir) != CEPH_NOSNAP) 1059 return -EROFS; 1060 1061 dout("link in dir %p old_dentry %p dentry %p\n", dir, 1062 old_dentry, dentry); 1063 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LINK, USE_AUTH_MDS); 1064 if (IS_ERR(req)) { 1065 d_drop(dentry); 1066 return PTR_ERR(req); 1067 } 1068 req->r_dentry = dget(dentry); 1069 req->r_num_caps = 2; 1070 req->r_old_dentry = dget(old_dentry); 1071 req->r_parent = dir; 1072 ihold(dir); 1073 set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags); 1074 req->r_dentry_drop = CEPH_CAP_FILE_SHARED; 1075 req->r_dentry_unless = CEPH_CAP_FILE_EXCL; 1076 /* release LINK_SHARED on source inode (mds will lock it) */ 1077 req->r_old_inode_drop = CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL; 1078 err = ceph_mdsc_do_request(mdsc, dir, req); 1079 if (err) { 1080 d_drop(dentry); 1081 } else if (!req->r_reply_info.head->is_dentry) { 1082 ihold(d_inode(old_dentry)); 1083 d_instantiate(dentry, d_inode(old_dentry)); 1084 } 1085 ceph_mdsc_put_request(req); 1086 return err; 1087 } 1088 1089 static void ceph_async_unlink_cb(struct ceph_mds_client *mdsc, 1090 struct ceph_mds_request *req) 1091 { 1092 struct dentry *dentry = req->r_dentry; 1093 struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb); 1094 struct ceph_dentry_info *di = ceph_dentry(dentry); 1095 int result = req->r_err ? req->r_err : 1096 le32_to_cpu(req->r_reply_info.head->result); 1097 1098 if (!test_bit(CEPH_DENTRY_ASYNC_UNLINK_BIT, &di->flags)) 1099 pr_warn("%s dentry %p:%pd async unlink bit is not set\n", 1100 __func__, dentry, dentry); 1101 1102 spin_lock(&fsc->async_unlink_conflict_lock); 1103 hash_del_rcu(&di->hnode); 1104 spin_unlock(&fsc->async_unlink_conflict_lock); 1105 1106 spin_lock(&dentry->d_lock); 1107 di->flags &= ~CEPH_DENTRY_ASYNC_UNLINK; 1108 wake_up_bit(&di->flags, CEPH_DENTRY_ASYNC_UNLINK_BIT); 1109 spin_unlock(&dentry->d_lock); 1110 1111 synchronize_rcu(); 1112 1113 if (result == -EJUKEBOX) 1114 goto out; 1115 1116 /* If op failed, mark everyone involved for errors */ 1117 if (result) { 1118 int pathlen = 0; 1119 u64 base = 0; 1120 char *path = ceph_mdsc_build_path(dentry, &pathlen, 1121 &base, 0); 1122 1123 /* mark error on parent + clear complete */ 1124 mapping_set_error(req->r_parent->i_mapping, result); 1125 ceph_dir_clear_complete(req->r_parent); 1126 1127 /* drop the dentry -- we don't know its status */ 1128 if (!d_unhashed(dentry)) 1129 d_drop(dentry); 1130 1131 /* mark inode itself for an error (since metadata is bogus) */ 1132 mapping_set_error(req->r_old_inode->i_mapping, result); 1133 1134 pr_warn("async unlink failure path=(%llx)%s result=%d!\n", 1135 base, IS_ERR(path) ? "<<bad>>" : path, result); 1136 ceph_mdsc_free_path(path, pathlen); 1137 } 1138 out: 1139 iput(req->r_old_inode); 1140 ceph_mdsc_release_dir_caps(req); 1141 } 1142 1143 static int get_caps_for_async_unlink(struct inode *dir, struct dentry *dentry) 1144 { 1145 struct ceph_inode_info *ci = ceph_inode(dir); 1146 struct ceph_dentry_info *di; 1147 int got = 0, want = CEPH_CAP_FILE_EXCL | CEPH_CAP_DIR_UNLINK; 1148 1149 spin_lock(&ci->i_ceph_lock); 1150 if ((__ceph_caps_issued(ci, NULL) & want) == want) { 1151 ceph_take_cap_refs(ci, want, false); 1152 got = want; 1153 } 1154 spin_unlock(&ci->i_ceph_lock); 1155 1156 /* If we didn't get anything, return 0 */ 1157 if (!got) 1158 return 0; 1159 1160 spin_lock(&dentry->d_lock); 1161 di = ceph_dentry(dentry); 1162 /* 1163 * - We are holding Fx, which implies Fs caps. 1164 * - Only support async unlink for primary linkage 1165 */ 1166 if (atomic_read(&ci->i_shared_gen) != di->lease_shared_gen || 1167 !(di->flags & CEPH_DENTRY_PRIMARY_LINK)) 1168 want = 0; 1169 spin_unlock(&dentry->d_lock); 1170 1171 /* Do we still want what we've got? */ 1172 if (want == got) 1173 return got; 1174 1175 ceph_put_cap_refs(ci, got); 1176 return 0; 1177 } 1178 1179 /* 1180 * rmdir and unlink are differ only by the metadata op code 1181 */ 1182 static int ceph_unlink(struct inode *dir, struct dentry *dentry) 1183 { 1184 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); 1185 struct ceph_mds_client *mdsc = fsc->mdsc; 1186 struct inode *inode = d_inode(dentry); 1187 struct ceph_mds_request *req; 1188 bool try_async = ceph_test_mount_opt(fsc, ASYNC_DIROPS); 1189 int err = -EROFS; 1190 int op; 1191 1192 if (ceph_snap(dir) == CEPH_SNAPDIR) { 1193 /* rmdir .snap/foo is RMSNAP */ 1194 dout("rmsnap dir %p '%pd' dn %p\n", dir, dentry, dentry); 1195 op = CEPH_MDS_OP_RMSNAP; 1196 } else if (ceph_snap(dir) == CEPH_NOSNAP) { 1197 dout("unlink/rmdir dir %p dn %p inode %p\n", 1198 dir, dentry, inode); 1199 op = d_is_dir(dentry) ? 1200 CEPH_MDS_OP_RMDIR : CEPH_MDS_OP_UNLINK; 1201 } else 1202 goto out; 1203 retry: 1204 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); 1205 if (IS_ERR(req)) { 1206 err = PTR_ERR(req); 1207 goto out; 1208 } 1209 req->r_dentry = dget(dentry); 1210 req->r_num_caps = 2; 1211 req->r_parent = dir; 1212 ihold(dir); 1213 req->r_dentry_drop = CEPH_CAP_FILE_SHARED; 1214 req->r_dentry_unless = CEPH_CAP_FILE_EXCL; 1215 req->r_inode_drop = ceph_drop_caps_for_unlink(inode); 1216 1217 if (try_async && op == CEPH_MDS_OP_UNLINK && 1218 (req->r_dir_caps = get_caps_for_async_unlink(dir, dentry))) { 1219 struct ceph_dentry_info *di = ceph_dentry(dentry); 1220 1221 dout("async unlink on %llu/%.*s caps=%s", ceph_ino(dir), 1222 dentry->d_name.len, dentry->d_name.name, 1223 ceph_cap_string(req->r_dir_caps)); 1224 set_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags); 1225 req->r_callback = ceph_async_unlink_cb; 1226 req->r_old_inode = d_inode(dentry); 1227 ihold(req->r_old_inode); 1228 1229 spin_lock(&dentry->d_lock); 1230 di->flags |= CEPH_DENTRY_ASYNC_UNLINK; 1231 spin_unlock(&dentry->d_lock); 1232 1233 spin_lock(&fsc->async_unlink_conflict_lock); 1234 hash_add_rcu(fsc->async_unlink_conflict, &di->hnode, 1235 dentry->d_name.hash); 1236 spin_unlock(&fsc->async_unlink_conflict_lock); 1237 1238 err = ceph_mdsc_submit_request(mdsc, dir, req); 1239 if (!err) { 1240 /* 1241 * We have enough caps, so we assume that the unlink 1242 * will succeed. Fix up the target inode and dcache. 1243 */ 1244 drop_nlink(inode); 1245 d_delete(dentry); 1246 } else { 1247 spin_lock(&fsc->async_unlink_conflict_lock); 1248 hash_del_rcu(&di->hnode); 1249 spin_unlock(&fsc->async_unlink_conflict_lock); 1250 1251 spin_lock(&dentry->d_lock); 1252 di->flags &= ~CEPH_DENTRY_ASYNC_UNLINK; 1253 spin_unlock(&dentry->d_lock); 1254 1255 if (err == -EJUKEBOX) { 1256 try_async = false; 1257 ceph_mdsc_put_request(req); 1258 goto retry; 1259 } 1260 } 1261 } else { 1262 set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags); 1263 err = ceph_mdsc_do_request(mdsc, dir, req); 1264 if (!err && !req->r_reply_info.head->is_dentry) 1265 d_delete(dentry); 1266 } 1267 1268 ceph_mdsc_put_request(req); 1269 out: 1270 return err; 1271 } 1272 1273 static int ceph_rename(struct user_namespace *mnt_userns, struct inode *old_dir, 1274 struct dentry *old_dentry, struct inode *new_dir, 1275 struct dentry *new_dentry, unsigned int flags) 1276 { 1277 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(old_dir->i_sb); 1278 struct ceph_mds_request *req; 1279 int op = CEPH_MDS_OP_RENAME; 1280 int err; 1281 1282 if (flags) 1283 return -EINVAL; 1284 1285 if (ceph_snap(old_dir) != ceph_snap(new_dir)) 1286 return -EXDEV; 1287 if (ceph_snap(old_dir) != CEPH_NOSNAP) { 1288 if (old_dir == new_dir && ceph_snap(old_dir) == CEPH_SNAPDIR) 1289 op = CEPH_MDS_OP_RENAMESNAP; 1290 else 1291 return -EROFS; 1292 } 1293 /* don't allow cross-quota renames */ 1294 if ((old_dir != new_dir) && 1295 (!ceph_quota_is_same_realm(old_dir, new_dir))) 1296 return -EXDEV; 1297 1298 err = ceph_wait_on_conflict_unlink(new_dentry); 1299 if (err) 1300 return err; 1301 1302 dout("rename dir %p dentry %p to dir %p dentry %p\n", 1303 old_dir, old_dentry, new_dir, new_dentry); 1304 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); 1305 if (IS_ERR(req)) 1306 return PTR_ERR(req); 1307 ihold(old_dir); 1308 req->r_dentry = dget(new_dentry); 1309 req->r_num_caps = 2; 1310 req->r_old_dentry = dget(old_dentry); 1311 req->r_old_dentry_dir = old_dir; 1312 req->r_parent = new_dir; 1313 ihold(new_dir); 1314 set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags); 1315 req->r_old_dentry_drop = CEPH_CAP_FILE_SHARED; 1316 req->r_old_dentry_unless = CEPH_CAP_FILE_EXCL; 1317 req->r_dentry_drop = CEPH_CAP_FILE_SHARED; 1318 req->r_dentry_unless = CEPH_CAP_FILE_EXCL; 1319 /* release LINK_RDCACHE on source inode (mds will lock it) */ 1320 req->r_old_inode_drop = CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL; 1321 if (d_really_is_positive(new_dentry)) { 1322 req->r_inode_drop = 1323 ceph_drop_caps_for_unlink(d_inode(new_dentry)); 1324 } 1325 err = ceph_mdsc_do_request(mdsc, old_dir, req); 1326 if (!err && !req->r_reply_info.head->is_dentry) { 1327 /* 1328 * Normally d_move() is done by fill_trace (called by 1329 * do_request, above). If there is no trace, we need 1330 * to do it here. 1331 */ 1332 d_move(old_dentry, new_dentry); 1333 } 1334 ceph_mdsc_put_request(req); 1335 return err; 1336 } 1337 1338 /* 1339 * Move dentry to tail of mdsc->dentry_leases list when lease is updated. 1340 * Leases at front of the list will expire first. (Assume all leases have 1341 * similar duration) 1342 * 1343 * Called under dentry->d_lock. 1344 */ 1345 void __ceph_dentry_lease_touch(struct ceph_dentry_info *di) 1346 { 1347 struct dentry *dn = di->dentry; 1348 struct ceph_mds_client *mdsc; 1349 1350 dout("dentry_lease_touch %p %p '%pd'\n", di, dn, dn); 1351 1352 di->flags |= CEPH_DENTRY_LEASE_LIST; 1353 if (di->flags & CEPH_DENTRY_SHRINK_LIST) { 1354 di->flags |= CEPH_DENTRY_REFERENCED; 1355 return; 1356 } 1357 1358 mdsc = ceph_sb_to_client(dn->d_sb)->mdsc; 1359 spin_lock(&mdsc->dentry_list_lock); 1360 list_move_tail(&di->lease_list, &mdsc->dentry_leases); 1361 spin_unlock(&mdsc->dentry_list_lock); 1362 } 1363 1364 static void __dentry_dir_lease_touch(struct ceph_mds_client* mdsc, 1365 struct ceph_dentry_info *di) 1366 { 1367 di->flags &= ~(CEPH_DENTRY_LEASE_LIST | CEPH_DENTRY_REFERENCED); 1368 di->lease_gen = 0; 1369 di->time = jiffies; 1370 list_move_tail(&di->lease_list, &mdsc->dentry_dir_leases); 1371 } 1372 1373 /* 1374 * When dir lease is used, add dentry to tail of mdsc->dentry_dir_leases 1375 * list if it's not in the list, otherwise set 'referenced' flag. 1376 * 1377 * Called under dentry->d_lock. 1378 */ 1379 void __ceph_dentry_dir_lease_touch(struct ceph_dentry_info *di) 1380 { 1381 struct dentry *dn = di->dentry; 1382 struct ceph_mds_client *mdsc; 1383 1384 dout("dentry_dir_lease_touch %p %p '%pd' (offset 0x%llx)\n", 1385 di, dn, dn, di->offset); 1386 1387 if (!list_empty(&di->lease_list)) { 1388 if (di->flags & CEPH_DENTRY_LEASE_LIST) { 1389 /* don't remove dentry from dentry lease list 1390 * if its lease is valid */ 1391 if (__dentry_lease_is_valid(di)) 1392 return; 1393 } else { 1394 di->flags |= CEPH_DENTRY_REFERENCED; 1395 return; 1396 } 1397 } 1398 1399 if (di->flags & CEPH_DENTRY_SHRINK_LIST) { 1400 di->flags |= CEPH_DENTRY_REFERENCED; 1401 di->flags &= ~CEPH_DENTRY_LEASE_LIST; 1402 return; 1403 } 1404 1405 mdsc = ceph_sb_to_client(dn->d_sb)->mdsc; 1406 spin_lock(&mdsc->dentry_list_lock); 1407 __dentry_dir_lease_touch(mdsc, di), 1408 spin_unlock(&mdsc->dentry_list_lock); 1409 } 1410 1411 static void __dentry_lease_unlist(struct ceph_dentry_info *di) 1412 { 1413 struct ceph_mds_client *mdsc; 1414 if (di->flags & CEPH_DENTRY_SHRINK_LIST) 1415 return; 1416 if (list_empty(&di->lease_list)) 1417 return; 1418 1419 mdsc = ceph_sb_to_client(di->dentry->d_sb)->mdsc; 1420 spin_lock(&mdsc->dentry_list_lock); 1421 list_del_init(&di->lease_list); 1422 spin_unlock(&mdsc->dentry_list_lock); 1423 } 1424 1425 enum { 1426 KEEP = 0, 1427 DELETE = 1, 1428 TOUCH = 2, 1429 STOP = 4, 1430 }; 1431 1432 struct ceph_lease_walk_control { 1433 bool dir_lease; 1434 bool expire_dir_lease; 1435 unsigned long nr_to_scan; 1436 unsigned long dir_lease_ttl; 1437 }; 1438 1439 static unsigned long 1440 __dentry_leases_walk(struct ceph_mds_client *mdsc, 1441 struct ceph_lease_walk_control *lwc, 1442 int (*check)(struct dentry*, void*)) 1443 { 1444 struct ceph_dentry_info *di, *tmp; 1445 struct dentry *dentry, *last = NULL; 1446 struct list_head* list; 1447 LIST_HEAD(dispose); 1448 unsigned long freed = 0; 1449 int ret = 0; 1450 1451 list = lwc->dir_lease ? &mdsc->dentry_dir_leases : &mdsc->dentry_leases; 1452 spin_lock(&mdsc->dentry_list_lock); 1453 list_for_each_entry_safe(di, tmp, list, lease_list) { 1454 if (!lwc->nr_to_scan) 1455 break; 1456 --lwc->nr_to_scan; 1457 1458 dentry = di->dentry; 1459 if (last == dentry) 1460 break; 1461 1462 if (!spin_trylock(&dentry->d_lock)) 1463 continue; 1464 1465 if (__lockref_is_dead(&dentry->d_lockref)) { 1466 list_del_init(&di->lease_list); 1467 goto next; 1468 } 1469 1470 ret = check(dentry, lwc); 1471 if (ret & TOUCH) { 1472 /* move it into tail of dir lease list */ 1473 __dentry_dir_lease_touch(mdsc, di); 1474 if (!last) 1475 last = dentry; 1476 } 1477 if (ret & DELETE) { 1478 /* stale lease */ 1479 di->flags &= ~CEPH_DENTRY_REFERENCED; 1480 if (dentry->d_lockref.count > 0) { 1481 /* update_dentry_lease() will re-add 1482 * it to lease list, or 1483 * ceph_d_delete() will return 1 when 1484 * last reference is dropped */ 1485 list_del_init(&di->lease_list); 1486 } else { 1487 di->flags |= CEPH_DENTRY_SHRINK_LIST; 1488 list_move_tail(&di->lease_list, &dispose); 1489 dget_dlock(dentry); 1490 } 1491 } 1492 next: 1493 spin_unlock(&dentry->d_lock); 1494 if (ret & STOP) 1495 break; 1496 } 1497 spin_unlock(&mdsc->dentry_list_lock); 1498 1499 while (!list_empty(&dispose)) { 1500 di = list_first_entry(&dispose, struct ceph_dentry_info, 1501 lease_list); 1502 dentry = di->dentry; 1503 spin_lock(&dentry->d_lock); 1504 1505 list_del_init(&di->lease_list); 1506 di->flags &= ~CEPH_DENTRY_SHRINK_LIST; 1507 if (di->flags & CEPH_DENTRY_REFERENCED) { 1508 spin_lock(&mdsc->dentry_list_lock); 1509 if (di->flags & CEPH_DENTRY_LEASE_LIST) { 1510 list_add_tail(&di->lease_list, 1511 &mdsc->dentry_leases); 1512 } else { 1513 __dentry_dir_lease_touch(mdsc, di); 1514 } 1515 spin_unlock(&mdsc->dentry_list_lock); 1516 } else { 1517 freed++; 1518 } 1519 1520 spin_unlock(&dentry->d_lock); 1521 /* ceph_d_delete() does the trick */ 1522 dput(dentry); 1523 } 1524 return freed; 1525 } 1526 1527 static int __dentry_lease_check(struct dentry *dentry, void *arg) 1528 { 1529 struct ceph_dentry_info *di = ceph_dentry(dentry); 1530 int ret; 1531 1532 if (__dentry_lease_is_valid(di)) 1533 return STOP; 1534 ret = __dir_lease_try_check(dentry); 1535 if (ret == -EBUSY) 1536 return KEEP; 1537 if (ret > 0) 1538 return TOUCH; 1539 return DELETE; 1540 } 1541 1542 static int __dir_lease_check(struct dentry *dentry, void *arg) 1543 { 1544 struct ceph_lease_walk_control *lwc = arg; 1545 struct ceph_dentry_info *di = ceph_dentry(dentry); 1546 1547 int ret = __dir_lease_try_check(dentry); 1548 if (ret == -EBUSY) 1549 return KEEP; 1550 if (ret > 0) { 1551 if (time_before(jiffies, di->time + lwc->dir_lease_ttl)) 1552 return STOP; 1553 /* Move dentry to tail of dir lease list if we don't want 1554 * to delete it. So dentries in the list are checked in a 1555 * round robin manner */ 1556 if (!lwc->expire_dir_lease) 1557 return TOUCH; 1558 if (dentry->d_lockref.count > 0 || 1559 (di->flags & CEPH_DENTRY_REFERENCED)) 1560 return TOUCH; 1561 /* invalidate dir lease */ 1562 di->lease_shared_gen = 0; 1563 } 1564 return DELETE; 1565 } 1566 1567 int ceph_trim_dentries(struct ceph_mds_client *mdsc) 1568 { 1569 struct ceph_lease_walk_control lwc; 1570 unsigned long count; 1571 unsigned long freed; 1572 1573 spin_lock(&mdsc->caps_list_lock); 1574 if (mdsc->caps_use_max > 0 && 1575 mdsc->caps_use_count > mdsc->caps_use_max) 1576 count = mdsc->caps_use_count - mdsc->caps_use_max; 1577 else 1578 count = 0; 1579 spin_unlock(&mdsc->caps_list_lock); 1580 1581 lwc.dir_lease = false; 1582 lwc.nr_to_scan = CEPH_CAPS_PER_RELEASE * 2; 1583 freed = __dentry_leases_walk(mdsc, &lwc, __dentry_lease_check); 1584 if (!lwc.nr_to_scan) /* more invalid leases */ 1585 return -EAGAIN; 1586 1587 if (lwc.nr_to_scan < CEPH_CAPS_PER_RELEASE) 1588 lwc.nr_to_scan = CEPH_CAPS_PER_RELEASE; 1589 1590 lwc.dir_lease = true; 1591 lwc.expire_dir_lease = freed < count; 1592 lwc.dir_lease_ttl = mdsc->fsc->mount_options->caps_wanted_delay_max * HZ; 1593 freed +=__dentry_leases_walk(mdsc, &lwc, __dir_lease_check); 1594 if (!lwc.nr_to_scan) /* more to check */ 1595 return -EAGAIN; 1596 1597 return freed > 0 ? 1 : 0; 1598 } 1599 1600 /* 1601 * Ensure a dentry lease will no longer revalidate. 1602 */ 1603 void ceph_invalidate_dentry_lease(struct dentry *dentry) 1604 { 1605 struct ceph_dentry_info *di = ceph_dentry(dentry); 1606 spin_lock(&dentry->d_lock); 1607 di->time = jiffies; 1608 di->lease_shared_gen = 0; 1609 di->flags &= ~CEPH_DENTRY_PRIMARY_LINK; 1610 __dentry_lease_unlist(di); 1611 spin_unlock(&dentry->d_lock); 1612 } 1613 1614 /* 1615 * Check if dentry lease is valid. If not, delete the lease. Try to 1616 * renew if the least is more than half up. 1617 */ 1618 static bool __dentry_lease_is_valid(struct ceph_dentry_info *di) 1619 { 1620 struct ceph_mds_session *session; 1621 1622 if (!di->lease_gen) 1623 return false; 1624 1625 session = di->lease_session; 1626 if (session) { 1627 u32 gen; 1628 unsigned long ttl; 1629 1630 gen = atomic_read(&session->s_cap_gen); 1631 ttl = session->s_cap_ttl; 1632 1633 if (di->lease_gen == gen && 1634 time_before(jiffies, ttl) && 1635 time_before(jiffies, di->time)) 1636 return true; 1637 } 1638 di->lease_gen = 0; 1639 return false; 1640 } 1641 1642 static int dentry_lease_is_valid(struct dentry *dentry, unsigned int flags) 1643 { 1644 struct ceph_dentry_info *di; 1645 struct ceph_mds_session *session = NULL; 1646 u32 seq = 0; 1647 int valid = 0; 1648 1649 spin_lock(&dentry->d_lock); 1650 di = ceph_dentry(dentry); 1651 if (di && __dentry_lease_is_valid(di)) { 1652 valid = 1; 1653 1654 if (di->lease_renew_after && 1655 time_after(jiffies, di->lease_renew_after)) { 1656 /* 1657 * We should renew. If we're in RCU walk mode 1658 * though, we can't do that so just return 1659 * -ECHILD. 1660 */ 1661 if (flags & LOOKUP_RCU) { 1662 valid = -ECHILD; 1663 } else { 1664 session = ceph_get_mds_session(di->lease_session); 1665 seq = di->lease_seq; 1666 di->lease_renew_after = 0; 1667 di->lease_renew_from = jiffies; 1668 } 1669 } 1670 } 1671 spin_unlock(&dentry->d_lock); 1672 1673 if (session) { 1674 ceph_mdsc_lease_send_msg(session, dentry, 1675 CEPH_MDS_LEASE_RENEW, seq); 1676 ceph_put_mds_session(session); 1677 } 1678 dout("dentry_lease_is_valid - dentry %p = %d\n", dentry, valid); 1679 return valid; 1680 } 1681 1682 /* 1683 * Called under dentry->d_lock. 1684 */ 1685 static int __dir_lease_try_check(const struct dentry *dentry) 1686 { 1687 struct ceph_dentry_info *di = ceph_dentry(dentry); 1688 struct inode *dir; 1689 struct ceph_inode_info *ci; 1690 int valid = 0; 1691 1692 if (!di->lease_shared_gen) 1693 return 0; 1694 if (IS_ROOT(dentry)) 1695 return 0; 1696 1697 dir = d_inode(dentry->d_parent); 1698 ci = ceph_inode(dir); 1699 1700 if (spin_trylock(&ci->i_ceph_lock)) { 1701 if (atomic_read(&ci->i_shared_gen) == di->lease_shared_gen && 1702 __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 0)) 1703 valid = 1; 1704 spin_unlock(&ci->i_ceph_lock); 1705 } else { 1706 valid = -EBUSY; 1707 } 1708 1709 if (!valid) 1710 di->lease_shared_gen = 0; 1711 return valid; 1712 } 1713 1714 /* 1715 * Check if directory-wide content lease/cap is valid. 1716 */ 1717 static int dir_lease_is_valid(struct inode *dir, struct dentry *dentry, 1718 struct ceph_mds_client *mdsc) 1719 { 1720 struct ceph_inode_info *ci = ceph_inode(dir); 1721 int valid; 1722 int shared_gen; 1723 1724 spin_lock(&ci->i_ceph_lock); 1725 valid = __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1); 1726 if (valid) { 1727 __ceph_touch_fmode(ci, mdsc, CEPH_FILE_MODE_RD); 1728 shared_gen = atomic_read(&ci->i_shared_gen); 1729 } 1730 spin_unlock(&ci->i_ceph_lock); 1731 if (valid) { 1732 struct ceph_dentry_info *di; 1733 spin_lock(&dentry->d_lock); 1734 di = ceph_dentry(dentry); 1735 if (dir == d_inode(dentry->d_parent) && 1736 di && di->lease_shared_gen == shared_gen) 1737 __ceph_dentry_dir_lease_touch(di); 1738 else 1739 valid = 0; 1740 spin_unlock(&dentry->d_lock); 1741 } 1742 dout("dir_lease_is_valid dir %p v%u dentry %p = %d\n", 1743 dir, (unsigned)atomic_read(&ci->i_shared_gen), dentry, valid); 1744 return valid; 1745 } 1746 1747 /* 1748 * Check if cached dentry can be trusted. 1749 */ 1750 static int ceph_d_revalidate(struct dentry *dentry, unsigned int flags) 1751 { 1752 int valid = 0; 1753 struct dentry *parent; 1754 struct inode *dir, *inode; 1755 struct ceph_mds_client *mdsc; 1756 1757 if (flags & LOOKUP_RCU) { 1758 parent = READ_ONCE(dentry->d_parent); 1759 dir = d_inode_rcu(parent); 1760 if (!dir) 1761 return -ECHILD; 1762 inode = d_inode_rcu(dentry); 1763 } else { 1764 parent = dget_parent(dentry); 1765 dir = d_inode(parent); 1766 inode = d_inode(dentry); 1767 } 1768 1769 dout("d_revalidate %p '%pd' inode %p offset 0x%llx\n", dentry, 1770 dentry, inode, ceph_dentry(dentry)->offset); 1771 1772 mdsc = ceph_sb_to_client(dir->i_sb)->mdsc; 1773 1774 /* always trust cached snapped dentries, snapdir dentry */ 1775 if (ceph_snap(dir) != CEPH_NOSNAP) { 1776 dout("d_revalidate %p '%pd' inode %p is SNAPPED\n", dentry, 1777 dentry, inode); 1778 valid = 1; 1779 } else if (inode && ceph_snap(inode) == CEPH_SNAPDIR) { 1780 valid = 1; 1781 } else { 1782 valid = dentry_lease_is_valid(dentry, flags); 1783 if (valid == -ECHILD) 1784 return valid; 1785 if (valid || dir_lease_is_valid(dir, dentry, mdsc)) { 1786 if (inode) 1787 valid = ceph_is_any_caps(inode); 1788 else 1789 valid = 1; 1790 } 1791 } 1792 1793 if (!valid) { 1794 struct ceph_mds_request *req; 1795 int op, err; 1796 u32 mask; 1797 1798 if (flags & LOOKUP_RCU) 1799 return -ECHILD; 1800 1801 percpu_counter_inc(&mdsc->metric.d_lease_mis); 1802 1803 op = ceph_snap(dir) == CEPH_SNAPDIR ? 1804 CEPH_MDS_OP_LOOKUPSNAP : CEPH_MDS_OP_LOOKUP; 1805 req = ceph_mdsc_create_request(mdsc, op, USE_ANY_MDS); 1806 if (!IS_ERR(req)) { 1807 req->r_dentry = dget(dentry); 1808 req->r_num_caps = 2; 1809 req->r_parent = dir; 1810 ihold(dir); 1811 1812 mask = CEPH_STAT_CAP_INODE | CEPH_CAP_AUTH_SHARED; 1813 if (ceph_security_xattr_wanted(dir)) 1814 mask |= CEPH_CAP_XATTR_SHARED; 1815 req->r_args.getattr.mask = cpu_to_le32(mask); 1816 1817 err = ceph_mdsc_do_request(mdsc, NULL, req); 1818 switch (err) { 1819 case 0: 1820 if (d_really_is_positive(dentry) && 1821 d_inode(dentry) == req->r_target_inode) 1822 valid = 1; 1823 break; 1824 case -ENOENT: 1825 if (d_really_is_negative(dentry)) 1826 valid = 1; 1827 fallthrough; 1828 default: 1829 break; 1830 } 1831 ceph_mdsc_put_request(req); 1832 dout("d_revalidate %p lookup result=%d\n", 1833 dentry, err); 1834 } 1835 } else { 1836 percpu_counter_inc(&mdsc->metric.d_lease_hit); 1837 } 1838 1839 dout("d_revalidate %p %s\n", dentry, valid ? "valid" : "invalid"); 1840 if (!valid) 1841 ceph_dir_clear_complete(dir); 1842 1843 if (!(flags & LOOKUP_RCU)) 1844 dput(parent); 1845 return valid; 1846 } 1847 1848 /* 1849 * Delete unused dentry that doesn't have valid lease 1850 * 1851 * Called under dentry->d_lock. 1852 */ 1853 static int ceph_d_delete(const struct dentry *dentry) 1854 { 1855 struct ceph_dentry_info *di; 1856 1857 /* won't release caps */ 1858 if (d_really_is_negative(dentry)) 1859 return 0; 1860 if (ceph_snap(d_inode(dentry)) != CEPH_NOSNAP) 1861 return 0; 1862 /* vaild lease? */ 1863 di = ceph_dentry(dentry); 1864 if (di) { 1865 if (__dentry_lease_is_valid(di)) 1866 return 0; 1867 if (__dir_lease_try_check(dentry)) 1868 return 0; 1869 } 1870 return 1; 1871 } 1872 1873 /* 1874 * Release our ceph_dentry_info. 1875 */ 1876 static void ceph_d_release(struct dentry *dentry) 1877 { 1878 struct ceph_dentry_info *di = ceph_dentry(dentry); 1879 struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb); 1880 1881 dout("d_release %p\n", dentry); 1882 1883 atomic64_dec(&fsc->mdsc->metric.total_dentries); 1884 1885 spin_lock(&dentry->d_lock); 1886 __dentry_lease_unlist(di); 1887 dentry->d_fsdata = NULL; 1888 spin_unlock(&dentry->d_lock); 1889 1890 ceph_put_mds_session(di->lease_session); 1891 kmem_cache_free(ceph_dentry_cachep, di); 1892 } 1893 1894 /* 1895 * When the VFS prunes a dentry from the cache, we need to clear the 1896 * complete flag on the parent directory. 1897 * 1898 * Called under dentry->d_lock. 1899 */ 1900 static void ceph_d_prune(struct dentry *dentry) 1901 { 1902 struct ceph_inode_info *dir_ci; 1903 struct ceph_dentry_info *di; 1904 1905 dout("ceph_d_prune %pd %p\n", dentry, dentry); 1906 1907 /* do we have a valid parent? */ 1908 if (IS_ROOT(dentry)) 1909 return; 1910 1911 /* we hold d_lock, so d_parent is stable */ 1912 dir_ci = ceph_inode(d_inode(dentry->d_parent)); 1913 if (dir_ci->i_vino.snap == CEPH_SNAPDIR) 1914 return; 1915 1916 /* who calls d_delete() should also disable dcache readdir */ 1917 if (d_really_is_negative(dentry)) 1918 return; 1919 1920 /* d_fsdata does not get cleared until d_release */ 1921 if (!d_unhashed(dentry)) { 1922 __ceph_dir_clear_complete(dir_ci); 1923 return; 1924 } 1925 1926 /* Disable dcache readdir just in case that someone called d_drop() 1927 * or d_invalidate(), but MDS didn't revoke CEPH_CAP_FILE_SHARED 1928 * properly (dcache readdir is still enabled) */ 1929 di = ceph_dentry(dentry); 1930 if (di->offset > 0 && 1931 di->lease_shared_gen == atomic_read(&dir_ci->i_shared_gen)) 1932 __ceph_dir_clear_ordered(dir_ci); 1933 } 1934 1935 /* 1936 * read() on a dir. This weird interface hack only works if mounted 1937 * with '-o dirstat'. 1938 */ 1939 static ssize_t ceph_read_dir(struct file *file, char __user *buf, size_t size, 1940 loff_t *ppos) 1941 { 1942 struct ceph_dir_file_info *dfi = file->private_data; 1943 struct inode *inode = file_inode(file); 1944 struct ceph_inode_info *ci = ceph_inode(inode); 1945 int left; 1946 const int bufsize = 1024; 1947 1948 if (!ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb), DIRSTAT)) 1949 return -EISDIR; 1950 1951 if (!dfi->dir_info) { 1952 dfi->dir_info = kmalloc(bufsize, GFP_KERNEL); 1953 if (!dfi->dir_info) 1954 return -ENOMEM; 1955 dfi->dir_info_len = 1956 snprintf(dfi->dir_info, bufsize, 1957 "entries: %20lld\n" 1958 " files: %20lld\n" 1959 " subdirs: %20lld\n" 1960 "rentries: %20lld\n" 1961 " rfiles: %20lld\n" 1962 " rsubdirs: %20lld\n" 1963 "rbytes: %20lld\n" 1964 "rctime: %10lld.%09ld\n", 1965 ci->i_files + ci->i_subdirs, 1966 ci->i_files, 1967 ci->i_subdirs, 1968 ci->i_rfiles + ci->i_rsubdirs, 1969 ci->i_rfiles, 1970 ci->i_rsubdirs, 1971 ci->i_rbytes, 1972 ci->i_rctime.tv_sec, 1973 ci->i_rctime.tv_nsec); 1974 } 1975 1976 if (*ppos >= dfi->dir_info_len) 1977 return 0; 1978 size = min_t(unsigned, size, dfi->dir_info_len-*ppos); 1979 left = copy_to_user(buf, dfi->dir_info + *ppos, size); 1980 if (left == size) 1981 return -EFAULT; 1982 *ppos += (size - left); 1983 return size - left; 1984 } 1985 1986 1987 1988 /* 1989 * Return name hash for a given dentry. This is dependent on 1990 * the parent directory's hash function. 1991 */ 1992 unsigned ceph_dentry_hash(struct inode *dir, struct dentry *dn) 1993 { 1994 struct ceph_inode_info *dci = ceph_inode(dir); 1995 unsigned hash; 1996 1997 switch (dci->i_dir_layout.dl_dir_hash) { 1998 case 0: /* for backward compat */ 1999 case CEPH_STR_HASH_LINUX: 2000 return dn->d_name.hash; 2001 2002 default: 2003 spin_lock(&dn->d_lock); 2004 hash = ceph_str_hash(dci->i_dir_layout.dl_dir_hash, 2005 dn->d_name.name, dn->d_name.len); 2006 spin_unlock(&dn->d_lock); 2007 return hash; 2008 } 2009 } 2010 2011 const struct file_operations ceph_dir_fops = { 2012 .read = ceph_read_dir, 2013 .iterate = ceph_readdir, 2014 .llseek = ceph_dir_llseek, 2015 .open = ceph_open, 2016 .release = ceph_release, 2017 .unlocked_ioctl = ceph_ioctl, 2018 .compat_ioctl = compat_ptr_ioctl, 2019 .fsync = ceph_fsync, 2020 .lock = ceph_lock, 2021 .flock = ceph_flock, 2022 }; 2023 2024 const struct file_operations ceph_snapdir_fops = { 2025 .iterate = ceph_readdir, 2026 .llseek = ceph_dir_llseek, 2027 .open = ceph_open, 2028 .release = ceph_release, 2029 }; 2030 2031 const struct inode_operations ceph_dir_iops = { 2032 .lookup = ceph_lookup, 2033 .permission = ceph_permission, 2034 .getattr = ceph_getattr, 2035 .setattr = ceph_setattr, 2036 .listxattr = ceph_listxattr, 2037 .get_inode_acl = ceph_get_acl, 2038 .set_acl = ceph_set_acl, 2039 .mknod = ceph_mknod, 2040 .symlink = ceph_symlink, 2041 .mkdir = ceph_mkdir, 2042 .link = ceph_link, 2043 .unlink = ceph_unlink, 2044 .rmdir = ceph_unlink, 2045 .rename = ceph_rename, 2046 .create = ceph_create, 2047 .atomic_open = ceph_atomic_open, 2048 }; 2049 2050 const struct inode_operations ceph_snapdir_iops = { 2051 .lookup = ceph_lookup, 2052 .permission = ceph_permission, 2053 .getattr = ceph_getattr, 2054 .mkdir = ceph_mkdir, 2055 .rmdir = ceph_unlink, 2056 .rename = ceph_rename, 2057 }; 2058 2059 const struct dentry_operations ceph_dentry_ops = { 2060 .d_revalidate = ceph_d_revalidate, 2061 .d_delete = ceph_d_delete, 2062 .d_release = ceph_d_release, 2063 .d_prune = ceph_d_prune, 2064 .d_init = ceph_d_init, 2065 }; 2066