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#include "crypto.h" 13 14/* 15 * Directory operations: readdir, lookup, create, link, unlink, 16 * rename, etc. 17 */ 18 19/* 20 * Ceph MDS operations are specified in terms of a base ino and 21 * relative path. Thus, the client can specify an operation on a 22 * specific inode (e.g., a getattr due to fstat(2)), or as a path 23 * relative to, say, the root directory. 24 * 25 * Normally, we limit ourselves to strict inode ops (no path component) 26 * or dentry operations (a single path component relative to an ino). The 27 * exception to this is open_root_dentry(), which will open the mount 28 * point by name. 29 */ 30 31const struct dentry_operations ceph_dentry_ops; 32 33static bool __dentry_lease_is_valid(struct ceph_dentry_info *di); 34static int __dir_lease_try_check(const struct dentry *dentry); 35 36/* 37 * Initialize ceph dentry state. 38 */ 39static int ceph_d_init(struct dentry *dentry) 40{ 41 struct ceph_dentry_info *di; 42 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(dentry->d_sb); 43 44 di = kmem_cache_zalloc(ceph_dentry_cachep, GFP_KERNEL); 45 if (!di) 46 return -ENOMEM; /* oh well */ 47 48 di->dentry = dentry; 49 di->lease_session = NULL; 50 di->time = jiffies; 51 dentry->d_fsdata = di; 52 INIT_LIST_HEAD(&di->lease_list); 53 54 atomic64_inc(&mdsc->metric.total_dentries); 55 56 return 0; 57} 58 59/* 60 * for f_pos for readdir: 61 * - hash order: 62 * (0xff << 52) | ((24 bits hash) << 28) | 63 * (the nth entry has hash collision); 64 * - frag+name order; 65 * ((frag value) << 28) | (the nth entry in frag); 66 */ 67#define OFFSET_BITS 28 68#define OFFSET_MASK ((1 << OFFSET_BITS) - 1) 69#define HASH_ORDER (0xffull << (OFFSET_BITS + 24)) 70loff_t ceph_make_fpos(unsigned high, unsigned off, bool hash_order) 71{ 72 loff_t fpos = ((loff_t)high << 28) | (loff_t)off; 73 if (hash_order) 74 fpos |= HASH_ORDER; 75 return fpos; 76} 77 78static bool is_hash_order(loff_t p) 79{ 80 return (p & HASH_ORDER) == HASH_ORDER; 81} 82 83static unsigned fpos_frag(loff_t p) 84{ 85 return p >> OFFSET_BITS; 86} 87 88static unsigned fpos_hash(loff_t p) 89{ 90 return ceph_frag_value(fpos_frag(p)); 91} 92 93static unsigned fpos_off(loff_t p) 94{ 95 return p & OFFSET_MASK; 96} 97 98static int fpos_cmp(loff_t l, loff_t r) 99{ 100 int v = ceph_frag_compare(fpos_frag(l), fpos_frag(r)); 101 if (v) 102 return v; 103 return (int)(fpos_off(l) - fpos_off(r)); 104} 105 106/* 107 * make note of the last dentry we read, so we can 108 * continue at the same lexicographical point, 109 * regardless of what dir changes take place on the 110 * server. 111 */ 112static int note_last_dentry(struct ceph_fs_client *fsc, 113 struct ceph_dir_file_info *dfi, 114 const char *name, 115 int len, unsigned next_offset) 116{ 117 char *buf = kmalloc(len+1, GFP_KERNEL); 118 if (!buf) 119 return -ENOMEM; 120 kfree(dfi->last_name); 121 dfi->last_name = buf; 122 memcpy(dfi->last_name, name, len); 123 dfi->last_name[len] = 0; 124 dfi->next_offset = next_offset; 125 doutc(fsc->client, "'%s'\n", dfi->last_name); 126 return 0; 127} 128 129 130static struct dentry * 131__dcache_find_get_entry(struct dentry *parent, u64 idx, 132 struct ceph_readdir_cache_control *cache_ctl) 133{ 134 struct inode *dir = d_inode(parent); 135 struct ceph_client *cl = ceph_inode_to_client(dir); 136 struct dentry *dentry; 137 unsigned idx_mask = (PAGE_SIZE / sizeof(struct dentry *)) - 1; 138 loff_t ptr_pos = idx * sizeof(struct dentry *); 139 pgoff_t ptr_pgoff = ptr_pos >> PAGE_SHIFT; 140 141 if (ptr_pos >= i_size_read(dir)) 142 return NULL; 143 144 if (!cache_ctl->page || ptr_pgoff != page_index(cache_ctl->page)) { 145 ceph_readdir_cache_release(cache_ctl); 146 cache_ctl->page = find_lock_page(&dir->i_data, ptr_pgoff); 147 if (!cache_ctl->page) { 148 doutc(cl, " page %lu not found\n", ptr_pgoff); 149 return ERR_PTR(-EAGAIN); 150 } 151 /* reading/filling the cache are serialized by 152 i_rwsem, no need to use page lock */ 153 unlock_page(cache_ctl->page); 154 cache_ctl->dentries = kmap(cache_ctl->page); 155 } 156 157 cache_ctl->index = idx & idx_mask; 158 159 rcu_read_lock(); 160 spin_lock(&parent->d_lock); 161 /* check i_size again here, because empty directory can be 162 * marked as complete while not holding the i_rwsem. */ 163 if (ceph_dir_is_complete_ordered(dir) && ptr_pos < i_size_read(dir)) 164 dentry = cache_ctl->dentries[cache_ctl->index]; 165 else 166 dentry = NULL; 167 spin_unlock(&parent->d_lock); 168 if (dentry && !lockref_get_not_dead(&dentry->d_lockref)) 169 dentry = NULL; 170 rcu_read_unlock(); 171 return dentry ? : ERR_PTR(-EAGAIN); 172} 173 174/* 175 * When possible, we try to satisfy a readdir by peeking at the 176 * dcache. We make this work by carefully ordering dentries on 177 * d_children when we initially get results back from the MDS, and 178 * falling back to a "normal" sync readdir if any dentries in the dir 179 * are dropped. 180 * 181 * Complete dir indicates that we have all dentries in the dir. It is 182 * defined IFF we hold CEPH_CAP_FILE_SHARED (which will be revoked by 183 * the MDS if/when the directory is modified). 184 */ 185static int __dcache_readdir(struct file *file, struct dir_context *ctx, 186 int shared_gen) 187{ 188 struct ceph_dir_file_info *dfi = file->private_data; 189 struct dentry *parent = file->f_path.dentry; 190 struct inode *dir = d_inode(parent); 191 struct ceph_fs_client *fsc = ceph_inode_to_fs_client(dir); 192 struct ceph_client *cl = ceph_inode_to_client(dir); 193 struct dentry *dentry, *last = NULL; 194 struct ceph_dentry_info *di; 195 struct ceph_readdir_cache_control cache_ctl = {}; 196 u64 idx = 0; 197 int err = 0; 198 199 doutc(cl, "%p %llx.%llx v%u at %llx\n", dir, ceph_vinop(dir), 200 (unsigned)shared_gen, ctx->pos); 201 202 /* search start position */ 203 if (ctx->pos > 2) { 204 u64 count = div_u64(i_size_read(dir), sizeof(struct dentry *)); 205 while (count > 0) { 206 u64 step = count >> 1; 207 dentry = __dcache_find_get_entry(parent, idx + step, 208 &cache_ctl); 209 if (!dentry) { 210 /* use linar search */ 211 idx = 0; 212 break; 213 } 214 if (IS_ERR(dentry)) { 215 err = PTR_ERR(dentry); 216 goto out; 217 } 218 di = ceph_dentry(dentry); 219 spin_lock(&dentry->d_lock); 220 if (fpos_cmp(di->offset, ctx->pos) < 0) { 221 idx += step + 1; 222 count -= step + 1; 223 } else { 224 count = step; 225 } 226 spin_unlock(&dentry->d_lock); 227 dput(dentry); 228 } 229 230 doutc(cl, "%p %llx.%llx cache idx %llu\n", dir, 231 ceph_vinop(dir), idx); 232 } 233 234 235 for (;;) { 236 bool emit_dentry = false; 237 dentry = __dcache_find_get_entry(parent, idx++, &cache_ctl); 238 if (!dentry) { 239 dfi->file_info.flags |= CEPH_F_ATEND; 240 err = 0; 241 break; 242 } 243 if (IS_ERR(dentry)) { 244 err = PTR_ERR(dentry); 245 goto out; 246 } 247 248 spin_lock(&dentry->d_lock); 249 di = ceph_dentry(dentry); 250 if (d_unhashed(dentry) || 251 d_really_is_negative(dentry) || 252 di->lease_shared_gen != shared_gen || 253 ((dentry->d_flags & DCACHE_NOKEY_NAME) && 254 fscrypt_has_encryption_key(dir))) { 255 spin_unlock(&dentry->d_lock); 256 dput(dentry); 257 err = -EAGAIN; 258 goto out; 259 } 260 if (fpos_cmp(ctx->pos, di->offset) <= 0) { 261 __ceph_dentry_dir_lease_touch(di); 262 emit_dentry = true; 263 } 264 spin_unlock(&dentry->d_lock); 265 266 if (emit_dentry) { 267 doutc(cl, " %llx dentry %p %pd %p\n", di->offset, 268 dentry, dentry, d_inode(dentry)); 269 ctx->pos = di->offset; 270 if (!dir_emit(ctx, dentry->d_name.name, 271 dentry->d_name.len, ceph_present_inode(d_inode(dentry)), 272 d_inode(dentry)->i_mode >> 12)) { 273 dput(dentry); 274 err = 0; 275 break; 276 } 277 ctx->pos++; 278 279 if (last) 280 dput(last); 281 last = dentry; 282 } else { 283 dput(dentry); 284 } 285 } 286out: 287 ceph_readdir_cache_release(&cache_ctl); 288 if (last) { 289 int ret; 290 di = ceph_dentry(last); 291 ret = note_last_dentry(fsc, dfi, last->d_name.name, 292 last->d_name.len, 293 fpos_off(di->offset) + 1); 294 if (ret < 0) 295 err = ret; 296 dput(last); 297 /* last_name no longer match cache index */ 298 if (dfi->readdir_cache_idx >= 0) { 299 dfi->readdir_cache_idx = -1; 300 dfi->dir_release_count = 0; 301 } 302 } 303 return err; 304} 305 306static bool need_send_readdir(struct ceph_dir_file_info *dfi, loff_t pos) 307{ 308 if (!dfi->last_readdir) 309 return true; 310 if (is_hash_order(pos)) 311 return !ceph_frag_contains_value(dfi->frag, fpos_hash(pos)); 312 else 313 return dfi->frag != fpos_frag(pos); 314} 315 316static int ceph_readdir(struct file *file, struct dir_context *ctx) 317{ 318 struct ceph_dir_file_info *dfi = file->private_data; 319 struct inode *inode = file_inode(file); 320 struct ceph_inode_info *ci = ceph_inode(inode); 321 struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode); 322 struct ceph_mds_client *mdsc = fsc->mdsc; 323 struct ceph_client *cl = fsc->client; 324 int i; 325 int err; 326 unsigned frag = -1; 327 struct ceph_mds_reply_info_parsed *rinfo; 328 329 doutc(cl, "%p %llx.%llx file %p pos %llx\n", inode, 330 ceph_vinop(inode), file, ctx->pos); 331 if (dfi->file_info.flags & CEPH_F_ATEND) 332 return 0; 333 334 /* always start with . and .. */ 335 if (ctx->pos == 0) { 336 doutc(cl, "%p %llx.%llx off 0 -> '.'\n", inode, 337 ceph_vinop(inode)); 338 if (!dir_emit(ctx, ".", 1, ceph_present_inode(inode), 339 inode->i_mode >> 12)) 340 return 0; 341 ctx->pos = 1; 342 } 343 if (ctx->pos == 1) { 344 u64 ino; 345 struct dentry *dentry = file->f_path.dentry; 346 347 spin_lock(&dentry->d_lock); 348 ino = ceph_present_inode(dentry->d_parent->d_inode); 349 spin_unlock(&dentry->d_lock); 350 351 doutc(cl, "%p %llx.%llx off 1 -> '..'\n", inode, 352 ceph_vinop(inode)); 353 if (!dir_emit(ctx, "..", 2, ino, inode->i_mode >> 12)) 354 return 0; 355 ctx->pos = 2; 356 } 357 358 err = ceph_fscrypt_prepare_readdir(inode); 359 if (err < 0) 360 return err; 361 362 spin_lock(&ci->i_ceph_lock); 363 /* request Fx cap. if have Fx, we don't need to release Fs cap 364 * for later create/unlink. */ 365 __ceph_touch_fmode(ci, mdsc, CEPH_FILE_MODE_WR); 366 /* can we use the dcache? */ 367 if (ceph_test_mount_opt(fsc, DCACHE) && 368 !ceph_test_mount_opt(fsc, NOASYNCREADDIR) && 369 ceph_snap(inode) != CEPH_SNAPDIR && 370 __ceph_dir_is_complete_ordered(ci) && 371 __ceph_caps_issued_mask_metric(ci, CEPH_CAP_FILE_SHARED, 1)) { 372 int shared_gen = atomic_read(&ci->i_shared_gen); 373 374 spin_unlock(&ci->i_ceph_lock); 375 err = __dcache_readdir(file, ctx, shared_gen); 376 if (err != -EAGAIN) 377 return err; 378 } else { 379 spin_unlock(&ci->i_ceph_lock); 380 } 381 382 /* proceed with a normal readdir */ 383more: 384 /* do we have the correct frag content buffered? */ 385 if (need_send_readdir(dfi, ctx->pos)) { 386 struct ceph_mds_request *req; 387 int op = ceph_snap(inode) == CEPH_SNAPDIR ? 388 CEPH_MDS_OP_LSSNAP : CEPH_MDS_OP_READDIR; 389 390 /* discard old result, if any */ 391 if (dfi->last_readdir) { 392 ceph_mdsc_put_request(dfi->last_readdir); 393 dfi->last_readdir = NULL; 394 } 395 396 if (is_hash_order(ctx->pos)) { 397 /* fragtree isn't always accurate. choose frag 398 * based on previous reply when possible. */ 399 if (frag == (unsigned)-1) 400 frag = ceph_choose_frag(ci, fpos_hash(ctx->pos), 401 NULL, NULL); 402 } else { 403 frag = fpos_frag(ctx->pos); 404 } 405 406 doutc(cl, "fetching %p %llx.%llx frag %x offset '%s'\n", 407 inode, ceph_vinop(inode), frag, dfi->last_name); 408 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); 409 if (IS_ERR(req)) 410 return PTR_ERR(req); 411 412 err = ceph_alloc_readdir_reply_buffer(req, inode); 413 if (err) { 414 ceph_mdsc_put_request(req); 415 return err; 416 } 417 /* hints to request -> mds selection code */ 418 req->r_direct_mode = USE_AUTH_MDS; 419 if (op == CEPH_MDS_OP_READDIR) { 420 req->r_direct_hash = ceph_frag_value(frag); 421 __set_bit(CEPH_MDS_R_DIRECT_IS_HASH, &req->r_req_flags); 422 req->r_inode_drop = CEPH_CAP_FILE_EXCL; 423 } 424 if (dfi->last_name) { 425 struct qstr d_name = { .name = dfi->last_name, 426 .len = strlen(dfi->last_name) }; 427 428 req->r_path2 = kzalloc(NAME_MAX + 1, GFP_KERNEL); 429 if (!req->r_path2) { 430 ceph_mdsc_put_request(req); 431 return -ENOMEM; 432 } 433 434 err = ceph_encode_encrypted_dname(inode, &d_name, 435 req->r_path2); 436 if (err < 0) { 437 ceph_mdsc_put_request(req); 438 return err; 439 } 440 } else if (is_hash_order(ctx->pos)) { 441 req->r_args.readdir.offset_hash = 442 cpu_to_le32(fpos_hash(ctx->pos)); 443 } 444 445 req->r_dir_release_cnt = dfi->dir_release_count; 446 req->r_dir_ordered_cnt = dfi->dir_ordered_count; 447 req->r_readdir_cache_idx = dfi->readdir_cache_idx; 448 req->r_readdir_offset = dfi->next_offset; 449 req->r_args.readdir.frag = cpu_to_le32(frag); 450 req->r_args.readdir.flags = 451 cpu_to_le16(CEPH_READDIR_REPLY_BITFLAGS); 452 453 req->r_inode = inode; 454 ihold(inode); 455 req->r_dentry = dget(file->f_path.dentry); 456 err = ceph_mdsc_do_request(mdsc, NULL, req); 457 if (err < 0) { 458 ceph_mdsc_put_request(req); 459 return err; 460 } 461 doutc(cl, "%p %llx.%llx got and parsed readdir result=%d" 462 "on frag %x, end=%d, complete=%d, hash_order=%d\n", 463 inode, ceph_vinop(inode), err, frag, 464 (int)req->r_reply_info.dir_end, 465 (int)req->r_reply_info.dir_complete, 466 (int)req->r_reply_info.hash_order); 467 468 rinfo = &req->r_reply_info; 469 if (le32_to_cpu(rinfo->dir_dir->frag) != frag) { 470 frag = le32_to_cpu(rinfo->dir_dir->frag); 471 if (!rinfo->hash_order) { 472 dfi->next_offset = req->r_readdir_offset; 473 /* adjust ctx->pos to beginning of frag */ 474 ctx->pos = ceph_make_fpos(frag, 475 dfi->next_offset, 476 false); 477 } 478 } 479 480 dfi->frag = frag; 481 dfi->last_readdir = req; 482 483 if (test_bit(CEPH_MDS_R_DID_PREPOPULATE, &req->r_req_flags)) { 484 dfi->readdir_cache_idx = req->r_readdir_cache_idx; 485 if (dfi->readdir_cache_idx < 0) { 486 /* preclude from marking dir ordered */ 487 dfi->dir_ordered_count = 0; 488 } else if (ceph_frag_is_leftmost(frag) && 489 dfi->next_offset == 2) { 490 /* note dir version at start of readdir so 491 * we can tell if any dentries get dropped */ 492 dfi->dir_release_count = req->r_dir_release_cnt; 493 dfi->dir_ordered_count = req->r_dir_ordered_cnt; 494 } 495 } else { 496 doutc(cl, "%p %llx.%llx !did_prepopulate\n", inode, 497 ceph_vinop(inode)); 498 /* disable readdir cache */ 499 dfi->readdir_cache_idx = -1; 500 /* preclude from marking dir complete */ 501 dfi->dir_release_count = 0; 502 } 503 504 /* note next offset and last dentry name */ 505 if (rinfo->dir_nr > 0) { 506 struct ceph_mds_reply_dir_entry *rde = 507 rinfo->dir_entries + (rinfo->dir_nr-1); 508 unsigned next_offset = req->r_reply_info.dir_end ? 509 2 : (fpos_off(rde->offset) + 1); 510 err = note_last_dentry(fsc, dfi, rde->name, 511 rde->name_len, next_offset); 512 if (err) { 513 ceph_mdsc_put_request(dfi->last_readdir); 514 dfi->last_readdir = NULL; 515 return err; 516 } 517 } else if (req->r_reply_info.dir_end) { 518 dfi->next_offset = 2; 519 /* keep last name */ 520 } 521 } 522 523 rinfo = &dfi->last_readdir->r_reply_info; 524 doutc(cl, "%p %llx.%llx frag %x num %d pos %llx chunk first %llx\n", 525 inode, ceph_vinop(inode), dfi->frag, rinfo->dir_nr, ctx->pos, 526 rinfo->dir_nr ? rinfo->dir_entries[0].offset : 0LL); 527 528 i = 0; 529 /* search start position */ 530 if (rinfo->dir_nr > 0) { 531 int step, nr = rinfo->dir_nr; 532 while (nr > 0) { 533 step = nr >> 1; 534 if (rinfo->dir_entries[i + step].offset < ctx->pos) { 535 i += step + 1; 536 nr -= step + 1; 537 } else { 538 nr = step; 539 } 540 } 541 } 542 for (; i < rinfo->dir_nr; i++) { 543 struct ceph_mds_reply_dir_entry *rde = rinfo->dir_entries + i; 544 545 if (rde->offset < ctx->pos) { 546 pr_warn_client(cl, 547 "%p %llx.%llx rde->offset 0x%llx ctx->pos 0x%llx\n", 548 inode, ceph_vinop(inode), rde->offset, ctx->pos); 549 return -EIO; 550 } 551 552 if (WARN_ON_ONCE(!rde->inode.in)) 553 return -EIO; 554 555 ctx->pos = rde->offset; 556 doutc(cl, "%p %llx.%llx (%d/%d) -> %llx '%.*s' %p\n", inode, 557 ceph_vinop(inode), i, rinfo->dir_nr, ctx->pos, 558 rde->name_len, rde->name, &rde->inode.in); 559 560 if (!dir_emit(ctx, rde->name, rde->name_len, 561 ceph_present_ino(inode->i_sb, le64_to_cpu(rde->inode.in->ino)), 562 le32_to_cpu(rde->inode.in->mode) >> 12)) { 563 /* 564 * NOTE: Here no need to put the 'dfi->last_readdir', 565 * because when dir_emit stops us it's most likely 566 * doesn't have enough memory, etc. So for next readdir 567 * it will continue. 568 */ 569 doutc(cl, "filldir stopping us...\n"); 570 return 0; 571 } 572 573 /* Reset the lengths to their original allocated vals */ 574 ctx->pos++; 575 } 576 577 ceph_mdsc_put_request(dfi->last_readdir); 578 dfi->last_readdir = NULL; 579 580 if (dfi->next_offset > 2) { 581 frag = dfi->frag; 582 goto more; 583 } 584 585 /* more frags? */ 586 if (!ceph_frag_is_rightmost(dfi->frag)) { 587 frag = ceph_frag_next(dfi->frag); 588 if (is_hash_order(ctx->pos)) { 589 loff_t new_pos = ceph_make_fpos(ceph_frag_value(frag), 590 dfi->next_offset, true); 591 if (new_pos > ctx->pos) 592 ctx->pos = new_pos; 593 /* keep last_name */ 594 } else { 595 ctx->pos = ceph_make_fpos(frag, dfi->next_offset, 596 false); 597 kfree(dfi->last_name); 598 dfi->last_name = NULL; 599 } 600 doutc(cl, "%p %llx.%llx next frag is %x\n", inode, 601 ceph_vinop(inode), frag); 602 goto more; 603 } 604 dfi->file_info.flags |= CEPH_F_ATEND; 605 606 /* 607 * if dir_release_count still matches the dir, no dentries 608 * were released during the whole readdir, and we should have 609 * the complete dir contents in our cache. 610 */ 611 if (atomic64_read(&ci->i_release_count) == 612 dfi->dir_release_count) { 613 spin_lock(&ci->i_ceph_lock); 614 if (dfi->dir_ordered_count == 615 atomic64_read(&ci->i_ordered_count)) { 616 doutc(cl, " marking %p %llx.%llx complete and ordered\n", 617 inode, ceph_vinop(inode)); 618 /* use i_size to track number of entries in 619 * readdir cache */ 620 BUG_ON(dfi->readdir_cache_idx < 0); 621 i_size_write(inode, dfi->readdir_cache_idx * 622 sizeof(struct dentry*)); 623 } else { 624 doutc(cl, " marking %llx.%llx complete\n", 625 ceph_vinop(inode)); 626 } 627 __ceph_dir_set_complete(ci, dfi->dir_release_count, 628 dfi->dir_ordered_count); 629 spin_unlock(&ci->i_ceph_lock); 630 } 631 doutc(cl, "%p %llx.%llx file %p done.\n", inode, ceph_vinop(inode), 632 file); 633 return 0; 634} 635 636static void reset_readdir(struct ceph_dir_file_info *dfi) 637{ 638 if (dfi->last_readdir) { 639 ceph_mdsc_put_request(dfi->last_readdir); 640 dfi->last_readdir = NULL; 641 } 642 kfree(dfi->last_name); 643 dfi->last_name = NULL; 644 dfi->dir_release_count = 0; 645 dfi->readdir_cache_idx = -1; 646 dfi->next_offset = 2; /* compensate for . and .. */ 647 dfi->file_info.flags &= ~CEPH_F_ATEND; 648} 649 650/* 651 * discard buffered readdir content on seekdir(0), or seek to new frag, 652 * or seek prior to current chunk 653 */ 654static bool need_reset_readdir(struct ceph_dir_file_info *dfi, loff_t new_pos) 655{ 656 struct ceph_mds_reply_info_parsed *rinfo; 657 loff_t chunk_offset; 658 if (new_pos == 0) 659 return true; 660 if (is_hash_order(new_pos)) { 661 /* no need to reset last_name for a forward seek when 662 * dentries are sotred in hash order */ 663 } else if (dfi->frag != fpos_frag(new_pos)) { 664 return true; 665 } 666 rinfo = dfi->last_readdir ? &dfi->last_readdir->r_reply_info : NULL; 667 if (!rinfo || !rinfo->dir_nr) 668 return true; 669 chunk_offset = rinfo->dir_entries[0].offset; 670 return new_pos < chunk_offset || 671 is_hash_order(new_pos) != is_hash_order(chunk_offset); 672} 673 674static loff_t ceph_dir_llseek(struct file *file, loff_t offset, int whence) 675{ 676 struct ceph_dir_file_info *dfi = file->private_data; 677 struct inode *inode = file->f_mapping->host; 678 struct ceph_client *cl = ceph_inode_to_client(inode); 679 loff_t retval; 680 681 inode_lock(inode); 682 retval = -EINVAL; 683 switch (whence) { 684 case SEEK_CUR: 685 offset += file->f_pos; 686 break; 687 case SEEK_SET: 688 break; 689 case SEEK_END: 690 retval = -EOPNOTSUPP; 691 goto out; 692 default: 693 goto out; 694 } 695 696 if (offset >= 0) { 697 if (need_reset_readdir(dfi, offset)) { 698 doutc(cl, "%p %llx.%llx dropping %p content\n", 699 inode, ceph_vinop(inode), file); 700 reset_readdir(dfi); 701 } else if (is_hash_order(offset) && offset > file->f_pos) { 702 /* for hash offset, we don't know if a forward seek 703 * is within same frag */ 704 dfi->dir_release_count = 0; 705 dfi->readdir_cache_idx = -1; 706 } 707 708 if (offset != file->f_pos) { 709 file->f_pos = offset; 710 file->f_version = 0; 711 dfi->file_info.flags &= ~CEPH_F_ATEND; 712 } 713 retval = offset; 714 } 715out: 716 inode_unlock(inode); 717 return retval; 718} 719 720/* 721 * Handle lookups for the hidden .snap directory. 722 */ 723struct dentry *ceph_handle_snapdir(struct ceph_mds_request *req, 724 struct dentry *dentry) 725{ 726 struct ceph_fs_client *fsc = ceph_sb_to_fs_client(dentry->d_sb); 727 struct inode *parent = d_inode(dentry->d_parent); /* we hold i_rwsem */ 728 struct ceph_client *cl = ceph_inode_to_client(parent); 729 730 /* .snap dir? */ 731 if (ceph_snap(parent) == CEPH_NOSNAP && 732 strcmp(dentry->d_name.name, fsc->mount_options->snapdir_name) == 0) { 733 struct dentry *res; 734 struct inode *inode = ceph_get_snapdir(parent); 735 736 res = d_splice_alias(inode, dentry); 737 doutc(cl, "ENOENT on snapdir %p '%pd', linking to " 738 "snapdir %p %llx.%llx. Spliced dentry %p\n", 739 dentry, dentry, inode, ceph_vinop(inode), res); 740 if (res) 741 dentry = res; 742 } 743 return dentry; 744} 745 746/* 747 * Figure out final result of a lookup/open request. 748 * 749 * Mainly, make sure we return the final req->r_dentry (if it already 750 * existed) in place of the original VFS-provided dentry when they 751 * differ. 752 * 753 * Gracefully handle the case where the MDS replies with -ENOENT and 754 * no trace (which it may do, at its discretion, e.g., if it doesn't 755 * care to issue a lease on the negative dentry). 756 */ 757struct dentry *ceph_finish_lookup(struct ceph_mds_request *req, 758 struct dentry *dentry, int err) 759{ 760 struct ceph_client *cl = req->r_mdsc->fsc->client; 761 762 if (err == -ENOENT) { 763 /* no trace? */ 764 err = 0; 765 if (!req->r_reply_info.head->is_dentry) { 766 doutc(cl, 767 "ENOENT and no trace, dentry %p inode %llx.%llx\n", 768 dentry, ceph_vinop(d_inode(dentry))); 769 if (d_really_is_positive(dentry)) { 770 d_drop(dentry); 771 err = -ENOENT; 772 } else { 773 d_add(dentry, NULL); 774 } 775 } 776 } 777 if (err) 778 dentry = ERR_PTR(err); 779 else if (dentry != req->r_dentry) 780 dentry = dget(req->r_dentry); /* we got spliced */ 781 else 782 dentry = NULL; 783 return dentry; 784} 785 786static bool is_root_ceph_dentry(struct inode *inode, struct dentry *dentry) 787{ 788 return ceph_ino(inode) == CEPH_INO_ROOT && 789 strncmp(dentry->d_name.name, ".ceph", 5) == 0; 790} 791 792/* 793 * Look up a single dir entry. If there is a lookup intent, inform 794 * the MDS so that it gets our 'caps wanted' value in a single op. 795 */ 796static struct dentry *ceph_lookup(struct inode *dir, struct dentry *dentry, 797 unsigned int flags) 798{ 799 struct ceph_fs_client *fsc = ceph_sb_to_fs_client(dir->i_sb); 800 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(dir->i_sb); 801 struct ceph_client *cl = fsc->client; 802 struct ceph_mds_request *req; 803 int op; 804 int mask; 805 int err; 806 807 doutc(cl, "%p %llx.%llx/'%pd' dentry %p\n", dir, ceph_vinop(dir), 808 dentry, dentry); 809 810 if (dentry->d_name.len > NAME_MAX) 811 return ERR_PTR(-ENAMETOOLONG); 812 813 if (IS_ENCRYPTED(dir)) { 814 bool had_key = fscrypt_has_encryption_key(dir); 815 816 err = fscrypt_prepare_lookup_partial(dir, dentry); 817 if (err < 0) 818 return ERR_PTR(err); 819 820 /* mark directory as incomplete if it has been unlocked */ 821 if (!had_key && fscrypt_has_encryption_key(dir)) 822 ceph_dir_clear_complete(dir); 823 } 824 825 /* can we conclude ENOENT locally? */ 826 if (d_really_is_negative(dentry)) { 827 struct ceph_inode_info *ci = ceph_inode(dir); 828 struct ceph_dentry_info *di = ceph_dentry(dentry); 829 830 spin_lock(&ci->i_ceph_lock); 831 doutc(cl, " dir %llx.%llx flags are 0x%lx\n", 832 ceph_vinop(dir), ci->i_ceph_flags); 833 if (strncmp(dentry->d_name.name, 834 fsc->mount_options->snapdir_name, 835 dentry->d_name.len) && 836 !is_root_ceph_dentry(dir, dentry) && 837 ceph_test_mount_opt(fsc, DCACHE) && 838 __ceph_dir_is_complete(ci) && 839 __ceph_caps_issued_mask_metric(ci, CEPH_CAP_FILE_SHARED, 1)) { 840 __ceph_touch_fmode(ci, mdsc, CEPH_FILE_MODE_RD); 841 spin_unlock(&ci->i_ceph_lock); 842 doutc(cl, " dir %llx.%llx complete, -ENOENT\n", 843 ceph_vinop(dir)); 844 d_add(dentry, NULL); 845 di->lease_shared_gen = atomic_read(&ci->i_shared_gen); 846 return NULL; 847 } 848 spin_unlock(&ci->i_ceph_lock); 849 } 850 851 op = ceph_snap(dir) == CEPH_SNAPDIR ? 852 CEPH_MDS_OP_LOOKUPSNAP : CEPH_MDS_OP_LOOKUP; 853 req = ceph_mdsc_create_request(mdsc, op, USE_ANY_MDS); 854 if (IS_ERR(req)) 855 return ERR_CAST(req); 856 req->r_dentry = dget(dentry); 857 req->r_num_caps = 2; 858 859 mask = CEPH_STAT_CAP_INODE | CEPH_CAP_AUTH_SHARED; 860 if (ceph_security_xattr_wanted(dir)) 861 mask |= CEPH_CAP_XATTR_SHARED; 862 req->r_args.getattr.mask = cpu_to_le32(mask); 863 864 ihold(dir); 865 req->r_parent = dir; 866 set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags); 867 err = ceph_mdsc_do_request(mdsc, NULL, req); 868 if (err == -ENOENT) { 869 struct dentry *res; 870 871 res = ceph_handle_snapdir(req, dentry); 872 if (IS_ERR(res)) { 873 err = PTR_ERR(res); 874 } else { 875 dentry = res; 876 err = 0; 877 } 878 } 879 dentry = ceph_finish_lookup(req, dentry, err); 880 ceph_mdsc_put_request(req); /* will dput(dentry) */ 881 doutc(cl, "result=%p\n", dentry); 882 return dentry; 883} 884 885/* 886 * If we do a create but get no trace back from the MDS, follow up with 887 * a lookup (the VFS expects us to link up the provided dentry). 888 */ 889int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry) 890{ 891 struct dentry *result = ceph_lookup(dir, dentry, 0); 892 893 if (result && !IS_ERR(result)) { 894 /* 895 * We created the item, then did a lookup, and found 896 * it was already linked to another inode we already 897 * had in our cache (and thus got spliced). To not 898 * confuse VFS (especially when inode is a directory), 899 * we don't link our dentry to that inode, return an 900 * error instead. 901 * 902 * This event should be rare and it happens only when 903 * we talk to old MDS. Recent MDS does not send traceless 904 * reply for request that creates new inode. 905 */ 906 d_drop(result); 907 return -ESTALE; 908 } 909 return PTR_ERR(result); 910} 911 912static int ceph_mknod(struct mnt_idmap *idmap, struct inode *dir, 913 struct dentry *dentry, umode_t mode, dev_t rdev) 914{ 915 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(dir->i_sb); 916 struct ceph_client *cl = mdsc->fsc->client; 917 struct ceph_mds_request *req; 918 struct ceph_acl_sec_ctx as_ctx = {}; 919 int err; 920 921 if (ceph_snap(dir) != CEPH_NOSNAP) 922 return -EROFS; 923 924 err = ceph_wait_on_conflict_unlink(dentry); 925 if (err) 926 return err; 927 928 if (ceph_quota_is_max_files_exceeded(dir)) { 929 err = -EDQUOT; 930 goto out; 931 } 932 933 doutc(cl, "%p %llx.%llx/'%pd' dentry %p mode 0%ho rdev %d\n", 934 dir, ceph_vinop(dir), dentry, dentry, mode, rdev); 935 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_MKNOD, USE_AUTH_MDS); 936 if (IS_ERR(req)) { 937 err = PTR_ERR(req); 938 goto out; 939 } 940 941 req->r_new_inode = ceph_new_inode(dir, dentry, &mode, &as_ctx); 942 if (IS_ERR(req->r_new_inode)) { 943 err = PTR_ERR(req->r_new_inode); 944 req->r_new_inode = NULL; 945 goto out_req; 946 } 947 948 if (S_ISREG(mode) && IS_ENCRYPTED(dir)) 949 set_bit(CEPH_MDS_R_FSCRYPT_FILE, &req->r_req_flags); 950 951 req->r_dentry = dget(dentry); 952 req->r_num_caps = 2; 953 req->r_parent = dir; 954 ihold(dir); 955 set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags); 956 req->r_mnt_idmap = mnt_idmap_get(idmap); 957 req->r_args.mknod.mode = cpu_to_le32(mode); 958 req->r_args.mknod.rdev = cpu_to_le32(rdev); 959 req->r_dentry_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_AUTH_EXCL | 960 CEPH_CAP_XATTR_EXCL; 961 req->r_dentry_unless = CEPH_CAP_FILE_EXCL; 962 963 ceph_as_ctx_to_req(req, &as_ctx); 964 965 err = ceph_mdsc_do_request(mdsc, dir, req); 966 if (!err && !req->r_reply_info.head->is_dentry) 967 err = ceph_handle_notrace_create(dir, dentry); 968out_req: 969 ceph_mdsc_put_request(req); 970out: 971 if (!err) 972 ceph_init_inode_acls(d_inode(dentry), &as_ctx); 973 else 974 d_drop(dentry); 975 ceph_release_acl_sec_ctx(&as_ctx); 976 return err; 977} 978 979static int ceph_create(struct mnt_idmap *idmap, struct inode *dir, 980 struct dentry *dentry, umode_t mode, bool excl) 981{ 982 return ceph_mknod(idmap, dir, dentry, mode, 0); 983} 984 985#if IS_ENABLED(CONFIG_FS_ENCRYPTION) 986static int prep_encrypted_symlink_target(struct ceph_mds_request *req, 987 const char *dest) 988{ 989 int err; 990 int len = strlen(dest); 991 struct fscrypt_str osd_link = FSTR_INIT(NULL, 0); 992 993 err = fscrypt_prepare_symlink(req->r_parent, dest, len, PATH_MAX, 994 &osd_link); 995 if (err) 996 goto out; 997 998 err = fscrypt_encrypt_symlink(req->r_new_inode, dest, len, &osd_link); 999 if (err) 1000 goto out; 1001 1002 req->r_path2 = kmalloc(CEPH_BASE64_CHARS(osd_link.len) + 1, GFP_KERNEL); 1003 if (!req->r_path2) { 1004 err = -ENOMEM; 1005 goto out; 1006 } 1007 1008 len = ceph_base64_encode(osd_link.name, osd_link.len, req->r_path2); 1009 req->r_path2[len] = '\0'; 1010out: 1011 fscrypt_fname_free_buffer(&osd_link); 1012 return err; 1013} 1014#else 1015static int prep_encrypted_symlink_target(struct ceph_mds_request *req, 1016 const char *dest) 1017{ 1018 return -EOPNOTSUPP; 1019} 1020#endif 1021 1022static int ceph_symlink(struct mnt_idmap *idmap, struct inode *dir, 1023 struct dentry *dentry, const char *dest) 1024{ 1025 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(dir->i_sb); 1026 struct ceph_client *cl = mdsc->fsc->client; 1027 struct ceph_mds_request *req; 1028 struct ceph_acl_sec_ctx as_ctx = {}; 1029 umode_t mode = S_IFLNK | 0777; 1030 int err; 1031 1032 if (ceph_snap(dir) != CEPH_NOSNAP) 1033 return -EROFS; 1034 1035 err = ceph_wait_on_conflict_unlink(dentry); 1036 if (err) 1037 return err; 1038 1039 if (ceph_quota_is_max_files_exceeded(dir)) { 1040 err = -EDQUOT; 1041 goto out; 1042 } 1043 1044 doutc(cl, "%p %llx.%llx/'%pd' to '%s'\n", dir, ceph_vinop(dir), dentry, 1045 dest); 1046 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SYMLINK, USE_AUTH_MDS); 1047 if (IS_ERR(req)) { 1048 err = PTR_ERR(req); 1049 goto out; 1050 } 1051 1052 req->r_new_inode = ceph_new_inode(dir, dentry, &mode, &as_ctx); 1053 if (IS_ERR(req->r_new_inode)) { 1054 err = PTR_ERR(req->r_new_inode); 1055 req->r_new_inode = NULL; 1056 goto out_req; 1057 } 1058 1059 req->r_parent = dir; 1060 ihold(dir); 1061 1062 if (IS_ENCRYPTED(req->r_new_inode)) { 1063 err = prep_encrypted_symlink_target(req, dest); 1064 if (err) 1065 goto out_req; 1066 } else { 1067 req->r_path2 = kstrdup(dest, GFP_KERNEL); 1068 if (!req->r_path2) { 1069 err = -ENOMEM; 1070 goto out_req; 1071 } 1072 } 1073 1074 set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags); 1075 req->r_mnt_idmap = mnt_idmap_get(idmap); 1076 req->r_dentry = dget(dentry); 1077 req->r_num_caps = 2; 1078 req->r_dentry_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_AUTH_EXCL | 1079 CEPH_CAP_XATTR_EXCL; 1080 req->r_dentry_unless = CEPH_CAP_FILE_EXCL; 1081 1082 ceph_as_ctx_to_req(req, &as_ctx); 1083 1084 err = ceph_mdsc_do_request(mdsc, dir, req); 1085 if (!err && !req->r_reply_info.head->is_dentry) 1086 err = ceph_handle_notrace_create(dir, dentry); 1087out_req: 1088 ceph_mdsc_put_request(req); 1089out: 1090 if (err) 1091 d_drop(dentry); 1092 ceph_release_acl_sec_ctx(&as_ctx); 1093 return err; 1094} 1095 1096static int ceph_mkdir(struct mnt_idmap *idmap, struct inode *dir, 1097 struct dentry *dentry, umode_t mode) 1098{ 1099 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(dir->i_sb); 1100 struct ceph_client *cl = mdsc->fsc->client; 1101 struct ceph_mds_request *req; 1102 struct ceph_acl_sec_ctx as_ctx = {}; 1103 int err; 1104 int op; 1105 1106 err = ceph_wait_on_conflict_unlink(dentry); 1107 if (err) 1108 return err; 1109 1110 if (ceph_snap(dir) == CEPH_SNAPDIR) { 1111 /* mkdir .snap/foo is a MKSNAP */ 1112 op = CEPH_MDS_OP_MKSNAP; 1113 doutc(cl, "mksnap %llx.%llx/'%pd' dentry %p\n", 1114 ceph_vinop(dir), dentry, dentry); 1115 } else if (ceph_snap(dir) == CEPH_NOSNAP) { 1116 doutc(cl, "mkdir %llx.%llx/'%pd' dentry %p mode 0%ho\n", 1117 ceph_vinop(dir), dentry, dentry, mode); 1118 op = CEPH_MDS_OP_MKDIR; 1119 } else { 1120 err = -EROFS; 1121 goto out; 1122 } 1123 1124 if (op == CEPH_MDS_OP_MKDIR && 1125 ceph_quota_is_max_files_exceeded(dir)) { 1126 err = -EDQUOT; 1127 goto out; 1128 } 1129 if ((op == CEPH_MDS_OP_MKSNAP) && IS_ENCRYPTED(dir) && 1130 !fscrypt_has_encryption_key(dir)) { 1131 err = -ENOKEY; 1132 goto out; 1133 } 1134 1135 1136 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); 1137 if (IS_ERR(req)) { 1138 err = PTR_ERR(req); 1139 goto out; 1140 } 1141 1142 mode |= S_IFDIR; 1143 req->r_new_inode = ceph_new_inode(dir, dentry, &mode, &as_ctx); 1144 if (IS_ERR(req->r_new_inode)) { 1145 err = PTR_ERR(req->r_new_inode); 1146 req->r_new_inode = NULL; 1147 goto out_req; 1148 } 1149 1150 req->r_dentry = dget(dentry); 1151 req->r_num_caps = 2; 1152 req->r_parent = dir; 1153 ihold(dir); 1154 set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags); 1155 if (op == CEPH_MDS_OP_MKDIR) 1156 req->r_mnt_idmap = mnt_idmap_get(idmap); 1157 req->r_args.mkdir.mode = cpu_to_le32(mode); 1158 req->r_dentry_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_AUTH_EXCL | 1159 CEPH_CAP_XATTR_EXCL; 1160 req->r_dentry_unless = CEPH_CAP_FILE_EXCL; 1161 1162 ceph_as_ctx_to_req(req, &as_ctx); 1163 1164 err = ceph_mdsc_do_request(mdsc, dir, req); 1165 if (!err && 1166 !req->r_reply_info.head->is_target && 1167 !req->r_reply_info.head->is_dentry) 1168 err = ceph_handle_notrace_create(dir, dentry); 1169out_req: 1170 ceph_mdsc_put_request(req); 1171out: 1172 if (!err) 1173 ceph_init_inode_acls(d_inode(dentry), &as_ctx); 1174 else 1175 d_drop(dentry); 1176 ceph_release_acl_sec_ctx(&as_ctx); 1177 return err; 1178} 1179 1180static int ceph_link(struct dentry *old_dentry, struct inode *dir, 1181 struct dentry *dentry) 1182{ 1183 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(dir->i_sb); 1184 struct ceph_client *cl = mdsc->fsc->client; 1185 struct ceph_mds_request *req; 1186 int err; 1187 1188 if (dentry->d_flags & DCACHE_DISCONNECTED) 1189 return -EINVAL; 1190 1191 err = ceph_wait_on_conflict_unlink(dentry); 1192 if (err) 1193 return err; 1194 1195 if (ceph_snap(dir) != CEPH_NOSNAP) 1196 return -EROFS; 1197 1198 err = fscrypt_prepare_link(old_dentry, dir, dentry); 1199 if (err) 1200 return err; 1201 1202 doutc(cl, "%p %llx.%llx/'%pd' to '%pd'\n", dir, ceph_vinop(dir), 1203 old_dentry, dentry); 1204 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LINK, USE_AUTH_MDS); 1205 if (IS_ERR(req)) { 1206 d_drop(dentry); 1207 return PTR_ERR(req); 1208 } 1209 req->r_dentry = dget(dentry); 1210 req->r_num_caps = 2; 1211 req->r_old_dentry = dget(old_dentry); 1212 /* 1213 * The old_dentry maybe a DCACHE_DISCONNECTED dentry, then we 1214 * will just pass the ino# to MDSs. 1215 */ 1216 if (old_dentry->d_flags & DCACHE_DISCONNECTED) 1217 req->r_ino2 = ceph_vino(d_inode(old_dentry)); 1218 req->r_parent = dir; 1219 ihold(dir); 1220 set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags); 1221 req->r_dentry_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_XATTR_EXCL; 1222 req->r_dentry_unless = CEPH_CAP_FILE_EXCL; 1223 /* release LINK_SHARED on source inode (mds will lock it) */ 1224 req->r_old_inode_drop = CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL; 1225 err = ceph_mdsc_do_request(mdsc, dir, req); 1226 if (err) { 1227 d_drop(dentry); 1228 } else if (!req->r_reply_info.head->is_dentry) { 1229 ihold(d_inode(old_dentry)); 1230 d_instantiate(dentry, d_inode(old_dentry)); 1231 } 1232 ceph_mdsc_put_request(req); 1233 return err; 1234} 1235 1236static void ceph_async_unlink_cb(struct ceph_mds_client *mdsc, 1237 struct ceph_mds_request *req) 1238{ 1239 struct dentry *dentry = req->r_dentry; 1240 struct ceph_fs_client *fsc = ceph_sb_to_fs_client(dentry->d_sb); 1241 struct ceph_client *cl = fsc->client; 1242 struct ceph_dentry_info *di = ceph_dentry(dentry); 1243 int result = req->r_err ? req->r_err : 1244 le32_to_cpu(req->r_reply_info.head->result); 1245 1246 if (!test_bit(CEPH_DENTRY_ASYNC_UNLINK_BIT, &di->flags)) 1247 pr_warn_client(cl, 1248 "dentry %p:%pd async unlink bit is not set\n", 1249 dentry, dentry); 1250 1251 spin_lock(&fsc->async_unlink_conflict_lock); 1252 hash_del_rcu(&di->hnode); 1253 spin_unlock(&fsc->async_unlink_conflict_lock); 1254 1255 spin_lock(&dentry->d_lock); 1256 di->flags &= ~CEPH_DENTRY_ASYNC_UNLINK; 1257 wake_up_bit(&di->flags, CEPH_DENTRY_ASYNC_UNLINK_BIT); 1258 spin_unlock(&dentry->d_lock); 1259 1260 synchronize_rcu(); 1261 1262 if (result == -EJUKEBOX) 1263 goto out; 1264 1265 /* If op failed, mark everyone involved for errors */ 1266 if (result) { 1267 int pathlen = 0; 1268 u64 base = 0; 1269 char *path = ceph_mdsc_build_path(mdsc, dentry, &pathlen, 1270 &base, 0); 1271 1272 /* mark error on parent + clear complete */ 1273 mapping_set_error(req->r_parent->i_mapping, result); 1274 ceph_dir_clear_complete(req->r_parent); 1275 1276 /* drop the dentry -- we don't know its status */ 1277 if (!d_unhashed(dentry)) 1278 d_drop(dentry); 1279 1280 /* mark inode itself for an error (since metadata is bogus) */ 1281 mapping_set_error(req->r_old_inode->i_mapping, result); 1282 1283 pr_warn_client(cl, "failure path=(%llx)%s result=%d!\n", 1284 base, IS_ERR(path) ? "<<bad>>" : path, result); 1285 ceph_mdsc_free_path(path, pathlen); 1286 } 1287out: 1288 iput(req->r_old_inode); 1289 ceph_mdsc_release_dir_caps(req); 1290} 1291 1292static int get_caps_for_async_unlink(struct inode *dir, struct dentry *dentry) 1293{ 1294 struct ceph_inode_info *ci = ceph_inode(dir); 1295 struct ceph_dentry_info *di; 1296 int got = 0, want = CEPH_CAP_FILE_EXCL | CEPH_CAP_DIR_UNLINK; 1297 1298 spin_lock(&ci->i_ceph_lock); 1299 if ((__ceph_caps_issued(ci, NULL) & want) == want) { 1300 ceph_take_cap_refs(ci, want, false); 1301 got = want; 1302 } 1303 spin_unlock(&ci->i_ceph_lock); 1304 1305 /* If we didn't get anything, return 0 */ 1306 if (!got) 1307 return 0; 1308 1309 spin_lock(&dentry->d_lock); 1310 di = ceph_dentry(dentry); 1311 /* 1312 * - We are holding Fx, which implies Fs caps. 1313 * - Only support async unlink for primary linkage 1314 */ 1315 if (atomic_read(&ci->i_shared_gen) != di->lease_shared_gen || 1316 !(di->flags & CEPH_DENTRY_PRIMARY_LINK)) 1317 want = 0; 1318 spin_unlock(&dentry->d_lock); 1319 1320 /* Do we still want what we've got? */ 1321 if (want == got) 1322 return got; 1323 1324 ceph_put_cap_refs(ci, got); 1325 return 0; 1326} 1327 1328/* 1329 * rmdir and unlink are differ only by the metadata op code 1330 */ 1331static int ceph_unlink(struct inode *dir, struct dentry *dentry) 1332{ 1333 struct ceph_fs_client *fsc = ceph_sb_to_fs_client(dir->i_sb); 1334 struct ceph_client *cl = fsc->client; 1335 struct ceph_mds_client *mdsc = fsc->mdsc; 1336 struct inode *inode = d_inode(dentry); 1337 struct ceph_mds_request *req; 1338 bool try_async = ceph_test_mount_opt(fsc, ASYNC_DIROPS); 1339 int err = -EROFS; 1340 int op; 1341 1342 if (ceph_snap(dir) == CEPH_SNAPDIR) { 1343 /* rmdir .snap/foo is RMSNAP */ 1344 doutc(cl, "rmsnap %llx.%llx/'%pd' dn\n", ceph_vinop(dir), 1345 dentry); 1346 op = CEPH_MDS_OP_RMSNAP; 1347 } else if (ceph_snap(dir) == CEPH_NOSNAP) { 1348 doutc(cl, "unlink/rmdir %llx.%llx/'%pd' inode %llx.%llx\n", 1349 ceph_vinop(dir), dentry, ceph_vinop(inode)); 1350 op = d_is_dir(dentry) ? 1351 CEPH_MDS_OP_RMDIR : CEPH_MDS_OP_UNLINK; 1352 } else 1353 goto out; 1354retry: 1355 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); 1356 if (IS_ERR(req)) { 1357 err = PTR_ERR(req); 1358 goto out; 1359 } 1360 req->r_dentry = dget(dentry); 1361 req->r_num_caps = 2; 1362 req->r_parent = dir; 1363 ihold(dir); 1364 req->r_dentry_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_XATTR_EXCL; 1365 req->r_dentry_unless = CEPH_CAP_FILE_EXCL; 1366 req->r_inode_drop = ceph_drop_caps_for_unlink(inode); 1367 1368 if (try_async && op == CEPH_MDS_OP_UNLINK && 1369 (req->r_dir_caps = get_caps_for_async_unlink(dir, dentry))) { 1370 struct ceph_dentry_info *di = ceph_dentry(dentry); 1371 1372 doutc(cl, "async unlink on %llx.%llx/'%pd' caps=%s", 1373 ceph_vinop(dir), dentry, 1374 ceph_cap_string(req->r_dir_caps)); 1375 set_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags); 1376 req->r_callback = ceph_async_unlink_cb; 1377 req->r_old_inode = d_inode(dentry); 1378 ihold(req->r_old_inode); 1379 1380 spin_lock(&dentry->d_lock); 1381 di->flags |= CEPH_DENTRY_ASYNC_UNLINK; 1382 spin_unlock(&dentry->d_lock); 1383 1384 spin_lock(&fsc->async_unlink_conflict_lock); 1385 hash_add_rcu(fsc->async_unlink_conflict, &di->hnode, 1386 dentry->d_name.hash); 1387 spin_unlock(&fsc->async_unlink_conflict_lock); 1388 1389 err = ceph_mdsc_submit_request(mdsc, dir, req); 1390 if (!err) { 1391 /* 1392 * We have enough caps, so we assume that the unlink 1393 * will succeed. Fix up the target inode and dcache. 1394 */ 1395 drop_nlink(inode); 1396 d_delete(dentry); 1397 } else { 1398 spin_lock(&fsc->async_unlink_conflict_lock); 1399 hash_del_rcu(&di->hnode); 1400 spin_unlock(&fsc->async_unlink_conflict_lock); 1401 1402 spin_lock(&dentry->d_lock); 1403 di->flags &= ~CEPH_DENTRY_ASYNC_UNLINK; 1404 spin_unlock(&dentry->d_lock); 1405 1406 if (err == -EJUKEBOX) { 1407 try_async = false; 1408 ceph_mdsc_put_request(req); 1409 goto retry; 1410 } 1411 } 1412 } else { 1413 set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags); 1414 err = ceph_mdsc_do_request(mdsc, dir, req); 1415 if (!err && !req->r_reply_info.head->is_dentry) 1416 d_delete(dentry); 1417 } 1418 1419 ceph_mdsc_put_request(req); 1420out: 1421 return err; 1422} 1423 1424static int ceph_rename(struct mnt_idmap *idmap, struct inode *old_dir, 1425 struct dentry *old_dentry, struct inode *new_dir, 1426 struct dentry *new_dentry, unsigned int flags) 1427{ 1428 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(old_dir->i_sb); 1429 struct ceph_client *cl = mdsc->fsc->client; 1430 struct ceph_mds_request *req; 1431 int op = CEPH_MDS_OP_RENAME; 1432 int err; 1433 1434 if (flags) 1435 return -EINVAL; 1436 1437 if (ceph_snap(old_dir) != ceph_snap(new_dir)) 1438 return -EXDEV; 1439 if (ceph_snap(old_dir) != CEPH_NOSNAP) { 1440 if (old_dir == new_dir && ceph_snap(old_dir) == CEPH_SNAPDIR) 1441 op = CEPH_MDS_OP_RENAMESNAP; 1442 else 1443 return -EROFS; 1444 } 1445 /* don't allow cross-quota renames */ 1446 if ((old_dir != new_dir) && 1447 (!ceph_quota_is_same_realm(old_dir, new_dir))) 1448 return -EXDEV; 1449 1450 err = ceph_wait_on_conflict_unlink(new_dentry); 1451 if (err) 1452 return err; 1453 1454 err = fscrypt_prepare_rename(old_dir, old_dentry, new_dir, new_dentry, 1455 flags); 1456 if (err) 1457 return err; 1458 1459 doutc(cl, "%llx.%llx/'%pd' to %llx.%llx/'%pd'\n", 1460 ceph_vinop(old_dir), old_dentry, ceph_vinop(new_dir), 1461 new_dentry); 1462 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); 1463 if (IS_ERR(req)) 1464 return PTR_ERR(req); 1465 ihold(old_dir); 1466 req->r_dentry = dget(new_dentry); 1467 req->r_num_caps = 2; 1468 req->r_old_dentry = dget(old_dentry); 1469 req->r_old_dentry_dir = old_dir; 1470 req->r_parent = new_dir; 1471 ihold(new_dir); 1472 set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags); 1473 req->r_old_dentry_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_XATTR_EXCL; 1474 req->r_old_dentry_unless = CEPH_CAP_FILE_EXCL; 1475 req->r_dentry_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_XATTR_EXCL; 1476 req->r_dentry_unless = CEPH_CAP_FILE_EXCL; 1477 /* release LINK_RDCACHE on source inode (mds will lock it) */ 1478 req->r_old_inode_drop = CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL; 1479 if (d_really_is_positive(new_dentry)) { 1480 req->r_inode_drop = 1481 ceph_drop_caps_for_unlink(d_inode(new_dentry)); 1482 } 1483 err = ceph_mdsc_do_request(mdsc, old_dir, req); 1484 if (!err && !req->r_reply_info.head->is_dentry) { 1485 /* 1486 * Normally d_move() is done by fill_trace (called by 1487 * do_request, above). If there is no trace, we need 1488 * to do it here. 1489 */ 1490 d_move(old_dentry, new_dentry); 1491 } 1492 ceph_mdsc_put_request(req); 1493 return err; 1494} 1495 1496/* 1497 * Move dentry to tail of mdsc->dentry_leases list when lease is updated. 1498 * Leases at front of the list will expire first. (Assume all leases have 1499 * similar duration) 1500 * 1501 * Called under dentry->d_lock. 1502 */ 1503void __ceph_dentry_lease_touch(struct ceph_dentry_info *di) 1504{ 1505 struct dentry *dn = di->dentry; 1506 struct ceph_mds_client *mdsc = ceph_sb_to_fs_client(dn->d_sb)->mdsc; 1507 struct ceph_client *cl = mdsc->fsc->client; 1508 1509 doutc(cl, "%p %p '%pd'\n", di, dn, dn); 1510 1511 di->flags |= CEPH_DENTRY_LEASE_LIST; 1512 if (di->flags & CEPH_DENTRY_SHRINK_LIST) { 1513 di->flags |= CEPH_DENTRY_REFERENCED; 1514 return; 1515 } 1516 1517 spin_lock(&mdsc->dentry_list_lock); 1518 list_move_tail(&di->lease_list, &mdsc->dentry_leases); 1519 spin_unlock(&mdsc->dentry_list_lock); 1520} 1521 1522static void __dentry_dir_lease_touch(struct ceph_mds_client* mdsc, 1523 struct ceph_dentry_info *di) 1524{ 1525 di->flags &= ~(CEPH_DENTRY_LEASE_LIST | CEPH_DENTRY_REFERENCED); 1526 di->lease_gen = 0; 1527 di->time = jiffies; 1528 list_move_tail(&di->lease_list, &mdsc->dentry_dir_leases); 1529} 1530 1531/* 1532 * When dir lease is used, add dentry to tail of mdsc->dentry_dir_leases 1533 * list if it's not in the list, otherwise set 'referenced' flag. 1534 * 1535 * Called under dentry->d_lock. 1536 */ 1537void __ceph_dentry_dir_lease_touch(struct ceph_dentry_info *di) 1538{ 1539 struct dentry *dn = di->dentry; 1540 struct ceph_mds_client *mdsc = ceph_sb_to_fs_client(dn->d_sb)->mdsc; 1541 struct ceph_client *cl = mdsc->fsc->client; 1542 1543 doutc(cl, "%p %p '%pd' (offset 0x%llx)\n", di, dn, dn, di->offset); 1544 1545 if (!list_empty(&di->lease_list)) { 1546 if (di->flags & CEPH_DENTRY_LEASE_LIST) { 1547 /* don't remove dentry from dentry lease list 1548 * if its lease is valid */ 1549 if (__dentry_lease_is_valid(di)) 1550 return; 1551 } else { 1552 di->flags |= CEPH_DENTRY_REFERENCED; 1553 return; 1554 } 1555 } 1556 1557 if (di->flags & CEPH_DENTRY_SHRINK_LIST) { 1558 di->flags |= CEPH_DENTRY_REFERENCED; 1559 di->flags &= ~CEPH_DENTRY_LEASE_LIST; 1560 return; 1561 } 1562 1563 spin_lock(&mdsc->dentry_list_lock); 1564 __dentry_dir_lease_touch(mdsc, di), 1565 spin_unlock(&mdsc->dentry_list_lock); 1566} 1567 1568static void __dentry_lease_unlist(struct ceph_dentry_info *di) 1569{ 1570 struct ceph_mds_client *mdsc; 1571 if (di->flags & CEPH_DENTRY_SHRINK_LIST) 1572 return; 1573 if (list_empty(&di->lease_list)) 1574 return; 1575 1576 mdsc = ceph_sb_to_fs_client(di->dentry->d_sb)->mdsc; 1577 spin_lock(&mdsc->dentry_list_lock); 1578 list_del_init(&di->lease_list); 1579 spin_unlock(&mdsc->dentry_list_lock); 1580} 1581 1582enum { 1583 KEEP = 0, 1584 DELETE = 1, 1585 TOUCH = 2, 1586 STOP = 4, 1587}; 1588 1589struct ceph_lease_walk_control { 1590 bool dir_lease; 1591 bool expire_dir_lease; 1592 unsigned long nr_to_scan; 1593 unsigned long dir_lease_ttl; 1594}; 1595 1596static int __dir_lease_check(const struct dentry *, struct ceph_lease_walk_control *); 1597static int __dentry_lease_check(const struct dentry *); 1598 1599static unsigned long 1600__dentry_leases_walk(struct ceph_mds_client *mdsc, 1601 struct ceph_lease_walk_control *lwc) 1602{ 1603 struct ceph_dentry_info *di, *tmp; 1604 struct dentry *dentry, *last = NULL; 1605 struct list_head* list; 1606 LIST_HEAD(dispose); 1607 unsigned long freed = 0; 1608 int ret = 0; 1609 1610 list = lwc->dir_lease ? &mdsc->dentry_dir_leases : &mdsc->dentry_leases; 1611 spin_lock(&mdsc->dentry_list_lock); 1612 list_for_each_entry_safe(di, tmp, list, lease_list) { 1613 if (!lwc->nr_to_scan) 1614 break; 1615 --lwc->nr_to_scan; 1616 1617 dentry = di->dentry; 1618 if (last == dentry) 1619 break; 1620 1621 if (!spin_trylock(&dentry->d_lock)) 1622 continue; 1623 1624 if (__lockref_is_dead(&dentry->d_lockref)) { 1625 list_del_init(&di->lease_list); 1626 goto next; 1627 } 1628 1629 if (lwc->dir_lease) 1630 ret = __dir_lease_check(dentry, lwc); 1631 else 1632 ret = __dentry_lease_check(dentry); 1633 if (ret & TOUCH) { 1634 /* move it into tail of dir lease list */ 1635 __dentry_dir_lease_touch(mdsc, di); 1636 if (!last) 1637 last = dentry; 1638 } 1639 if (ret & DELETE) { 1640 /* stale lease */ 1641 di->flags &= ~CEPH_DENTRY_REFERENCED; 1642 if (dentry->d_lockref.count > 0) { 1643 /* update_dentry_lease() will re-add 1644 * it to lease list, or 1645 * ceph_d_delete() will return 1 when 1646 * last reference is dropped */ 1647 list_del_init(&di->lease_list); 1648 } else { 1649 di->flags |= CEPH_DENTRY_SHRINK_LIST; 1650 list_move_tail(&di->lease_list, &dispose); 1651 dget_dlock(dentry); 1652 } 1653 } 1654next: 1655 spin_unlock(&dentry->d_lock); 1656 if (ret & STOP) 1657 break; 1658 } 1659 spin_unlock(&mdsc->dentry_list_lock); 1660 1661 while (!list_empty(&dispose)) { 1662 di = list_first_entry(&dispose, struct ceph_dentry_info, 1663 lease_list); 1664 dentry = di->dentry; 1665 spin_lock(&dentry->d_lock); 1666 1667 list_del_init(&di->lease_list); 1668 di->flags &= ~CEPH_DENTRY_SHRINK_LIST; 1669 if (di->flags & CEPH_DENTRY_REFERENCED) { 1670 spin_lock(&mdsc->dentry_list_lock); 1671 if (di->flags & CEPH_DENTRY_LEASE_LIST) { 1672 list_add_tail(&di->lease_list, 1673 &mdsc->dentry_leases); 1674 } else { 1675 __dentry_dir_lease_touch(mdsc, di); 1676 } 1677 spin_unlock(&mdsc->dentry_list_lock); 1678 } else { 1679 freed++; 1680 } 1681 1682 spin_unlock(&dentry->d_lock); 1683 /* ceph_d_delete() does the trick */ 1684 dput(dentry); 1685 } 1686 return freed; 1687} 1688 1689static int __dentry_lease_check(const struct dentry *dentry) 1690{ 1691 struct ceph_dentry_info *di = ceph_dentry(dentry); 1692 int ret; 1693 1694 if (__dentry_lease_is_valid(di)) 1695 return STOP; 1696 ret = __dir_lease_try_check(dentry); 1697 if (ret == -EBUSY) 1698 return KEEP; 1699 if (ret > 0) 1700 return TOUCH; 1701 return DELETE; 1702} 1703 1704static int __dir_lease_check(const struct dentry *dentry, 1705 struct ceph_lease_walk_control *lwc) 1706{ 1707 struct ceph_dentry_info *di = ceph_dentry(dentry); 1708 1709 int ret = __dir_lease_try_check(dentry); 1710 if (ret == -EBUSY) 1711 return KEEP; 1712 if (ret > 0) { 1713 if (time_before(jiffies, di->time + lwc->dir_lease_ttl)) 1714 return STOP; 1715 /* Move dentry to tail of dir lease list if we don't want 1716 * to delete it. So dentries in the list are checked in a 1717 * round robin manner */ 1718 if (!lwc->expire_dir_lease) 1719 return TOUCH; 1720 if (dentry->d_lockref.count > 0 || 1721 (di->flags & CEPH_DENTRY_REFERENCED)) 1722 return TOUCH; 1723 /* invalidate dir lease */ 1724 di->lease_shared_gen = 0; 1725 } 1726 return DELETE; 1727} 1728 1729int ceph_trim_dentries(struct ceph_mds_client *mdsc) 1730{ 1731 struct ceph_lease_walk_control lwc; 1732 unsigned long count; 1733 unsigned long freed; 1734 1735 spin_lock(&mdsc->caps_list_lock); 1736 if (mdsc->caps_use_max > 0 && 1737 mdsc->caps_use_count > mdsc->caps_use_max) 1738 count = mdsc->caps_use_count - mdsc->caps_use_max; 1739 else 1740 count = 0; 1741 spin_unlock(&mdsc->caps_list_lock); 1742 1743 lwc.dir_lease = false; 1744 lwc.nr_to_scan = CEPH_CAPS_PER_RELEASE * 2; 1745 freed = __dentry_leases_walk(mdsc, &lwc); 1746 if (!lwc.nr_to_scan) /* more invalid leases */ 1747 return -EAGAIN; 1748 1749 if (lwc.nr_to_scan < CEPH_CAPS_PER_RELEASE) 1750 lwc.nr_to_scan = CEPH_CAPS_PER_RELEASE; 1751 1752 lwc.dir_lease = true; 1753 lwc.expire_dir_lease = freed < count; 1754 lwc.dir_lease_ttl = mdsc->fsc->mount_options->caps_wanted_delay_max * HZ; 1755 freed +=__dentry_leases_walk(mdsc, &lwc); 1756 if (!lwc.nr_to_scan) /* more to check */ 1757 return -EAGAIN; 1758 1759 return freed > 0 ? 1 : 0; 1760} 1761 1762/* 1763 * Ensure a dentry lease will no longer revalidate. 1764 */ 1765void ceph_invalidate_dentry_lease(struct dentry *dentry) 1766{ 1767 struct ceph_dentry_info *di = ceph_dentry(dentry); 1768 spin_lock(&dentry->d_lock); 1769 di->time = jiffies; 1770 di->lease_shared_gen = 0; 1771 di->flags &= ~CEPH_DENTRY_PRIMARY_LINK; 1772 __dentry_lease_unlist(di); 1773 spin_unlock(&dentry->d_lock); 1774} 1775 1776/* 1777 * Check if dentry lease is valid. If not, delete the lease. Try to 1778 * renew if the least is more than half up. 1779 */ 1780static bool __dentry_lease_is_valid(struct ceph_dentry_info *di) 1781{ 1782 struct ceph_mds_session *session; 1783 1784 if (!di->lease_gen) 1785 return false; 1786 1787 session = di->lease_session; 1788 if (session) { 1789 u32 gen; 1790 unsigned long ttl; 1791 1792 gen = atomic_read(&session->s_cap_gen); 1793 ttl = session->s_cap_ttl; 1794 1795 if (di->lease_gen == gen && 1796 time_before(jiffies, ttl) && 1797 time_before(jiffies, di->time)) 1798 return true; 1799 } 1800 di->lease_gen = 0; 1801 return false; 1802} 1803 1804static int dentry_lease_is_valid(struct dentry *dentry, unsigned int flags) 1805{ 1806 struct ceph_dentry_info *di; 1807 struct ceph_mds_session *session = NULL; 1808 struct ceph_mds_client *mdsc = ceph_sb_to_fs_client(dentry->d_sb)->mdsc; 1809 struct ceph_client *cl = mdsc->fsc->client; 1810 u32 seq = 0; 1811 int valid = 0; 1812 1813 spin_lock(&dentry->d_lock); 1814 di = ceph_dentry(dentry); 1815 if (di && __dentry_lease_is_valid(di)) { 1816 valid = 1; 1817 1818 if (di->lease_renew_after && 1819 time_after(jiffies, di->lease_renew_after)) { 1820 /* 1821 * We should renew. If we're in RCU walk mode 1822 * though, we can't do that so just return 1823 * -ECHILD. 1824 */ 1825 if (flags & LOOKUP_RCU) { 1826 valid = -ECHILD; 1827 } else { 1828 session = ceph_get_mds_session(di->lease_session); 1829 seq = di->lease_seq; 1830 di->lease_renew_after = 0; 1831 di->lease_renew_from = jiffies; 1832 } 1833 } 1834 } 1835 spin_unlock(&dentry->d_lock); 1836 1837 if (session) { 1838 ceph_mdsc_lease_send_msg(session, dentry, 1839 CEPH_MDS_LEASE_RENEW, seq); 1840 ceph_put_mds_session(session); 1841 } 1842 doutc(cl, "dentry %p = %d\n", dentry, valid); 1843 return valid; 1844} 1845 1846/* 1847 * Called under dentry->d_lock. 1848 */ 1849static int __dir_lease_try_check(const struct dentry *dentry) 1850{ 1851 struct ceph_dentry_info *di = ceph_dentry(dentry); 1852 struct inode *dir; 1853 struct ceph_inode_info *ci; 1854 int valid = 0; 1855 1856 if (!di->lease_shared_gen) 1857 return 0; 1858 if (IS_ROOT(dentry)) 1859 return 0; 1860 1861 dir = d_inode(dentry->d_parent); 1862 ci = ceph_inode(dir); 1863 1864 if (spin_trylock(&ci->i_ceph_lock)) { 1865 if (atomic_read(&ci->i_shared_gen) == di->lease_shared_gen && 1866 __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 0)) 1867 valid = 1; 1868 spin_unlock(&ci->i_ceph_lock); 1869 } else { 1870 valid = -EBUSY; 1871 } 1872 1873 if (!valid) 1874 di->lease_shared_gen = 0; 1875 return valid; 1876} 1877 1878/* 1879 * Check if directory-wide content lease/cap is valid. 1880 */ 1881static int dir_lease_is_valid(struct inode *dir, struct dentry *dentry, 1882 struct ceph_mds_client *mdsc) 1883{ 1884 struct ceph_inode_info *ci = ceph_inode(dir); 1885 struct ceph_client *cl = mdsc->fsc->client; 1886 int valid; 1887 int shared_gen; 1888 1889 spin_lock(&ci->i_ceph_lock); 1890 valid = __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1); 1891 if (valid) { 1892 __ceph_touch_fmode(ci, mdsc, CEPH_FILE_MODE_RD); 1893 shared_gen = atomic_read(&ci->i_shared_gen); 1894 } 1895 spin_unlock(&ci->i_ceph_lock); 1896 if (valid) { 1897 struct ceph_dentry_info *di; 1898 spin_lock(&dentry->d_lock); 1899 di = ceph_dentry(dentry); 1900 if (dir == d_inode(dentry->d_parent) && 1901 di && di->lease_shared_gen == shared_gen) 1902 __ceph_dentry_dir_lease_touch(di); 1903 else 1904 valid = 0; 1905 spin_unlock(&dentry->d_lock); 1906 } 1907 doutc(cl, "dir %p %llx.%llx v%u dentry %p '%pd' = %d\n", dir, 1908 ceph_vinop(dir), (unsigned)atomic_read(&ci->i_shared_gen), 1909 dentry, dentry, valid); 1910 return valid; 1911} 1912 1913/* 1914 * Check if cached dentry can be trusted. 1915 */ 1916static int ceph_d_revalidate(struct dentry *dentry, unsigned int flags) 1917{ 1918 struct ceph_mds_client *mdsc = ceph_sb_to_fs_client(dentry->d_sb)->mdsc; 1919 struct ceph_client *cl = mdsc->fsc->client; 1920 int valid = 0; 1921 struct dentry *parent; 1922 struct inode *dir, *inode; 1923 1924 valid = fscrypt_d_revalidate(dentry, flags); 1925 if (valid <= 0) 1926 return valid; 1927 1928 if (flags & LOOKUP_RCU) { 1929 parent = READ_ONCE(dentry->d_parent); 1930 dir = d_inode_rcu(parent); 1931 if (!dir) 1932 return -ECHILD; 1933 inode = d_inode_rcu(dentry); 1934 } else { 1935 parent = dget_parent(dentry); 1936 dir = d_inode(parent); 1937 inode = d_inode(dentry); 1938 } 1939 1940 doutc(cl, "%p '%pd' inode %p offset 0x%llx nokey %d\n", 1941 dentry, dentry, inode, ceph_dentry(dentry)->offset, 1942 !!(dentry->d_flags & DCACHE_NOKEY_NAME)); 1943 1944 mdsc = ceph_sb_to_fs_client(dir->i_sb)->mdsc; 1945 1946 /* always trust cached snapped dentries, snapdir dentry */ 1947 if (ceph_snap(dir) != CEPH_NOSNAP) { 1948 doutc(cl, "%p '%pd' inode %p is SNAPPED\n", dentry, 1949 dentry, inode); 1950 valid = 1; 1951 } else if (inode && ceph_snap(inode) == CEPH_SNAPDIR) { 1952 valid = 1; 1953 } else { 1954 valid = dentry_lease_is_valid(dentry, flags); 1955 if (valid == -ECHILD) 1956 return valid; 1957 if (valid || dir_lease_is_valid(dir, dentry, mdsc)) { 1958 if (inode) 1959 valid = ceph_is_any_caps(inode); 1960 else 1961 valid = 1; 1962 } 1963 } 1964 1965 if (!valid) { 1966 struct ceph_mds_request *req; 1967 int op, err; 1968 u32 mask; 1969 1970 if (flags & LOOKUP_RCU) 1971 return -ECHILD; 1972 1973 percpu_counter_inc(&mdsc->metric.d_lease_mis); 1974 1975 op = ceph_snap(dir) == CEPH_SNAPDIR ? 1976 CEPH_MDS_OP_LOOKUPSNAP : CEPH_MDS_OP_LOOKUP; 1977 req = ceph_mdsc_create_request(mdsc, op, USE_ANY_MDS); 1978 if (!IS_ERR(req)) { 1979 req->r_dentry = dget(dentry); 1980 req->r_num_caps = 2; 1981 req->r_parent = dir; 1982 ihold(dir); 1983 1984 mask = CEPH_STAT_CAP_INODE | CEPH_CAP_AUTH_SHARED; 1985 if (ceph_security_xattr_wanted(dir)) 1986 mask |= CEPH_CAP_XATTR_SHARED; 1987 req->r_args.getattr.mask = cpu_to_le32(mask); 1988 1989 err = ceph_mdsc_do_request(mdsc, NULL, req); 1990 switch (err) { 1991 case 0: 1992 if (d_really_is_positive(dentry) && 1993 d_inode(dentry) == req->r_target_inode) 1994 valid = 1; 1995 break; 1996 case -ENOENT: 1997 if (d_really_is_negative(dentry)) 1998 valid = 1; 1999 fallthrough; 2000 default: 2001 break; 2002 } 2003 ceph_mdsc_put_request(req); 2004 doutc(cl, "%p '%pd', lookup result=%d\n", dentry, 2005 dentry, err); 2006 } 2007 } else { 2008 percpu_counter_inc(&mdsc->metric.d_lease_hit); 2009 } 2010 2011 doutc(cl, "%p '%pd' %s\n", dentry, dentry, valid ? "valid" : "invalid"); 2012 if (!valid) 2013 ceph_dir_clear_complete(dir); 2014 2015 if (!(flags & LOOKUP_RCU)) 2016 dput(parent); 2017 return valid; 2018} 2019 2020/* 2021 * Delete unused dentry that doesn't have valid lease 2022 * 2023 * Called under dentry->d_lock. 2024 */ 2025static int ceph_d_delete(const struct dentry *dentry) 2026{ 2027 struct ceph_dentry_info *di; 2028 2029 /* won't release caps */ 2030 if (d_really_is_negative(dentry)) 2031 return 0; 2032 if (ceph_snap(d_inode(dentry)) != CEPH_NOSNAP) 2033 return 0; 2034 /* vaild lease? */ 2035 di = ceph_dentry(dentry); 2036 if (di) { 2037 if (__dentry_lease_is_valid(di)) 2038 return 0; 2039 if (__dir_lease_try_check(dentry)) 2040 return 0; 2041 } 2042 return 1; 2043} 2044 2045/* 2046 * Release our ceph_dentry_info. 2047 */ 2048static void ceph_d_release(struct dentry *dentry) 2049{ 2050 struct ceph_dentry_info *di = ceph_dentry(dentry); 2051 struct ceph_fs_client *fsc = ceph_sb_to_fs_client(dentry->d_sb); 2052 2053 doutc(fsc->client, "dentry %p '%pd'\n", dentry, dentry); 2054 2055 atomic64_dec(&fsc->mdsc->metric.total_dentries); 2056 2057 spin_lock(&dentry->d_lock); 2058 __dentry_lease_unlist(di); 2059 dentry->d_fsdata = NULL; 2060 spin_unlock(&dentry->d_lock); 2061 2062 ceph_put_mds_session(di->lease_session); 2063 kmem_cache_free(ceph_dentry_cachep, di); 2064} 2065 2066/* 2067 * When the VFS prunes a dentry from the cache, we need to clear the 2068 * complete flag on the parent directory. 2069 * 2070 * Called under dentry->d_lock. 2071 */ 2072static void ceph_d_prune(struct dentry *dentry) 2073{ 2074 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(dentry->d_sb); 2075 struct ceph_client *cl = mdsc->fsc->client; 2076 struct ceph_inode_info *dir_ci; 2077 struct ceph_dentry_info *di; 2078 2079 doutc(cl, "dentry %p '%pd'\n", dentry, dentry); 2080 2081 /* do we have a valid parent? */ 2082 if (IS_ROOT(dentry)) 2083 return; 2084 2085 /* we hold d_lock, so d_parent is stable */ 2086 dir_ci = ceph_inode(d_inode(dentry->d_parent)); 2087 if (dir_ci->i_vino.snap == CEPH_SNAPDIR) 2088 return; 2089 2090 /* who calls d_delete() should also disable dcache readdir */ 2091 if (d_really_is_negative(dentry)) 2092 return; 2093 2094 /* d_fsdata does not get cleared until d_release */ 2095 if (!d_unhashed(dentry)) { 2096 __ceph_dir_clear_complete(dir_ci); 2097 return; 2098 } 2099 2100 /* Disable dcache readdir just in case that someone called d_drop() 2101 * or d_invalidate(), but MDS didn't revoke CEPH_CAP_FILE_SHARED 2102 * properly (dcache readdir is still enabled) */ 2103 di = ceph_dentry(dentry); 2104 if (di->offset > 0 && 2105 di->lease_shared_gen == atomic_read(&dir_ci->i_shared_gen)) 2106 __ceph_dir_clear_ordered(dir_ci); 2107} 2108 2109/* 2110 * read() on a dir. This weird interface hack only works if mounted 2111 * with '-o dirstat'. 2112 */ 2113static ssize_t ceph_read_dir(struct file *file, char __user *buf, size_t size, 2114 loff_t *ppos) 2115{ 2116 struct ceph_dir_file_info *dfi = file->private_data; 2117 struct inode *inode = file_inode(file); 2118 struct ceph_inode_info *ci = ceph_inode(inode); 2119 int left; 2120 const int bufsize = 1024; 2121 2122 if (!ceph_test_mount_opt(ceph_sb_to_fs_client(inode->i_sb), DIRSTAT)) 2123 return -EISDIR; 2124 2125 if (!dfi->dir_info) { 2126 dfi->dir_info = kmalloc(bufsize, GFP_KERNEL); 2127 if (!dfi->dir_info) 2128 return -ENOMEM; 2129 dfi->dir_info_len = 2130 snprintf(dfi->dir_info, bufsize, 2131 "entries: %20lld\n" 2132 " files: %20lld\n" 2133 " subdirs: %20lld\n" 2134 "rentries: %20lld\n" 2135 " rfiles: %20lld\n" 2136 " rsubdirs: %20lld\n" 2137 "rbytes: %20lld\n" 2138 "rctime: %10lld.%09ld\n", 2139 ci->i_files + ci->i_subdirs, 2140 ci->i_files, 2141 ci->i_subdirs, 2142 ci->i_rfiles + ci->i_rsubdirs, 2143 ci->i_rfiles, 2144 ci->i_rsubdirs, 2145 ci->i_rbytes, 2146 ci->i_rctime.tv_sec, 2147 ci->i_rctime.tv_nsec); 2148 } 2149 2150 if (*ppos >= dfi->dir_info_len) 2151 return 0; 2152 size = min_t(unsigned, size, dfi->dir_info_len-*ppos); 2153 left = copy_to_user(buf, dfi->dir_info + *ppos, size); 2154 if (left == size) 2155 return -EFAULT; 2156 *ppos += (size - left); 2157 return size - left; 2158} 2159 2160 2161 2162/* 2163 * Return name hash for a given dentry. This is dependent on 2164 * the parent directory's hash function. 2165 */ 2166unsigned ceph_dentry_hash(struct inode *dir, struct dentry *dn) 2167{ 2168 struct ceph_inode_info *dci = ceph_inode(dir); 2169 unsigned hash; 2170 2171 switch (dci->i_dir_layout.dl_dir_hash) { 2172 case 0: /* for backward compat */ 2173 case CEPH_STR_HASH_LINUX: 2174 return dn->d_name.hash; 2175 2176 default: 2177 spin_lock(&dn->d_lock); 2178 hash = ceph_str_hash(dci->i_dir_layout.dl_dir_hash, 2179 dn->d_name.name, dn->d_name.len); 2180 spin_unlock(&dn->d_lock); 2181 return hash; 2182 } 2183} 2184 2185WRAP_DIR_ITER(ceph_readdir) // FIXME! 2186const struct file_operations ceph_dir_fops = { 2187 .read = ceph_read_dir, 2188 .iterate_shared = shared_ceph_readdir, 2189 .llseek = ceph_dir_llseek, 2190 .open = ceph_open, 2191 .release = ceph_release, 2192 .unlocked_ioctl = ceph_ioctl, 2193 .compat_ioctl = compat_ptr_ioctl, 2194 .fsync = ceph_fsync, 2195 .lock = ceph_lock, 2196 .flock = ceph_flock, 2197}; 2198 2199const struct file_operations ceph_snapdir_fops = { 2200 .iterate_shared = shared_ceph_readdir, 2201 .llseek = ceph_dir_llseek, 2202 .open = ceph_open, 2203 .release = ceph_release, 2204}; 2205 2206const struct inode_operations ceph_dir_iops = { 2207 .lookup = ceph_lookup, 2208 .permission = ceph_permission, 2209 .getattr = ceph_getattr, 2210 .setattr = ceph_setattr, 2211 .listxattr = ceph_listxattr, 2212 .get_inode_acl = ceph_get_acl, 2213 .set_acl = ceph_set_acl, 2214 .mknod = ceph_mknod, 2215 .symlink = ceph_symlink, 2216 .mkdir = ceph_mkdir, 2217 .link = ceph_link, 2218 .unlink = ceph_unlink, 2219 .rmdir = ceph_unlink, 2220 .rename = ceph_rename, 2221 .create = ceph_create, 2222 .atomic_open = ceph_atomic_open, 2223}; 2224 2225const struct inode_operations ceph_snapdir_iops = { 2226 .lookup = ceph_lookup, 2227 .permission = ceph_permission, 2228 .getattr = ceph_getattr, 2229 .mkdir = ceph_mkdir, 2230 .rmdir = ceph_unlink, 2231 .rename = ceph_rename, 2232}; 2233 2234const struct dentry_operations ceph_dentry_ops = { 2235 .d_revalidate = ceph_d_revalidate, 2236 .d_delete = ceph_d_delete, 2237 .d_release = ceph_d_release, 2238 .d_prune = ceph_d_prune, 2239 .d_init = ceph_d_init, 2240}; 2241