1 // SPDX-License-Identifier: GPL-2.0 2 #include <linux/ceph/ceph_debug.h> 3 4 #include <linux/module.h> 5 #include <linux/fs.h> 6 #include <linux/slab.h> 7 #include <linux/string.h> 8 #include <linux/uaccess.h> 9 #include <linux/kernel.h> 10 #include <linux/writeback.h> 11 #include <linux/vmalloc.h> 12 #include <linux/xattr.h> 13 #include <linux/posix_acl.h> 14 #include <linux/random.h> 15 #include <linux/sort.h> 16 #include <linux/iversion.h> 17 18 #include "super.h" 19 #include "mds_client.h" 20 #include "cache.h" 21 #include <linux/ceph/decode.h> 22 23 /* 24 * Ceph inode operations 25 * 26 * Implement basic inode helpers (get, alloc) and inode ops (getattr, 27 * setattr, etc.), xattr helpers, and helpers for assimilating 28 * metadata returned by the MDS into our cache. 29 * 30 * Also define helpers for doing asynchronous writeback, invalidation, 31 * and truncation for the benefit of those who can't afford to block 32 * (typically because they are in the message handler path). 33 */ 34 35 static const struct inode_operations ceph_symlink_iops; 36 37 static void ceph_inode_work(struct work_struct *work); 38 39 /* 40 * find or create an inode, given the ceph ino number 41 */ 42 static int ceph_set_ino_cb(struct inode *inode, void *data) 43 { 44 struct ceph_inode_info *ci = ceph_inode(inode); 45 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb); 46 47 ci->i_vino = *(struct ceph_vino *)data; 48 inode->i_ino = ceph_vino_to_ino_t(ci->i_vino); 49 inode_set_iversion_raw(inode, 0); 50 percpu_counter_inc(&mdsc->metric.total_inodes); 51 52 return 0; 53 } 54 55 struct inode *ceph_get_inode(struct super_block *sb, struct ceph_vino vino) 56 { 57 struct inode *inode; 58 59 if (ceph_vino_is_reserved(vino)) 60 return ERR_PTR(-EREMOTEIO); 61 62 inode = iget5_locked(sb, (unsigned long)vino.ino, ceph_ino_compare, 63 ceph_set_ino_cb, &vino); 64 if (!inode) 65 return ERR_PTR(-ENOMEM); 66 67 dout("get_inode on %llu=%llx.%llx got %p new %d\n", ceph_present_inode(inode), 68 ceph_vinop(inode), inode, !!(inode->i_state & I_NEW)); 69 return inode; 70 } 71 72 /* 73 * get/constuct snapdir inode for a given directory 74 */ 75 struct inode *ceph_get_snapdir(struct inode *parent) 76 { 77 struct ceph_vino vino = { 78 .ino = ceph_ino(parent), 79 .snap = CEPH_SNAPDIR, 80 }; 81 struct inode *inode = ceph_get_inode(parent->i_sb, vino); 82 struct ceph_inode_info *ci = ceph_inode(inode); 83 84 if (IS_ERR(inode)) 85 return inode; 86 87 if (!S_ISDIR(parent->i_mode)) { 88 pr_warn_once("bad snapdir parent type (mode=0%o)\n", 89 parent->i_mode); 90 return ERR_PTR(-ENOTDIR); 91 } 92 93 if (!(inode->i_state & I_NEW) && !S_ISDIR(inode->i_mode)) { 94 pr_warn_once("bad snapdir inode type (mode=0%o)\n", 95 inode->i_mode); 96 return ERR_PTR(-ENOTDIR); 97 } 98 99 inode->i_mode = parent->i_mode; 100 inode->i_uid = parent->i_uid; 101 inode->i_gid = parent->i_gid; 102 inode->i_mtime = parent->i_mtime; 103 inode->i_ctime = parent->i_ctime; 104 inode->i_atime = parent->i_atime; 105 ci->i_rbytes = 0; 106 ci->i_btime = ceph_inode(parent)->i_btime; 107 108 if (inode->i_state & I_NEW) { 109 inode->i_op = &ceph_snapdir_iops; 110 inode->i_fop = &ceph_snapdir_fops; 111 ci->i_snap_caps = CEPH_CAP_PIN; /* so we can open */ 112 unlock_new_inode(inode); 113 } 114 115 return inode; 116 } 117 118 const struct inode_operations ceph_file_iops = { 119 .permission = ceph_permission, 120 .setattr = ceph_setattr, 121 .getattr = ceph_getattr, 122 .listxattr = ceph_listxattr, 123 .get_acl = ceph_get_acl, 124 .set_acl = ceph_set_acl, 125 }; 126 127 128 /* 129 * We use a 'frag tree' to keep track of the MDS's directory fragments 130 * for a given inode (usually there is just a single fragment). We 131 * need to know when a child frag is delegated to a new MDS, or when 132 * it is flagged as replicated, so we can direct our requests 133 * accordingly. 134 */ 135 136 /* 137 * find/create a frag in the tree 138 */ 139 static struct ceph_inode_frag *__get_or_create_frag(struct ceph_inode_info *ci, 140 u32 f) 141 { 142 struct rb_node **p; 143 struct rb_node *parent = NULL; 144 struct ceph_inode_frag *frag; 145 int c; 146 147 p = &ci->i_fragtree.rb_node; 148 while (*p) { 149 parent = *p; 150 frag = rb_entry(parent, struct ceph_inode_frag, node); 151 c = ceph_frag_compare(f, frag->frag); 152 if (c < 0) 153 p = &(*p)->rb_left; 154 else if (c > 0) 155 p = &(*p)->rb_right; 156 else 157 return frag; 158 } 159 160 frag = kmalloc(sizeof(*frag), GFP_NOFS); 161 if (!frag) 162 return ERR_PTR(-ENOMEM); 163 164 frag->frag = f; 165 frag->split_by = 0; 166 frag->mds = -1; 167 frag->ndist = 0; 168 169 rb_link_node(&frag->node, parent, p); 170 rb_insert_color(&frag->node, &ci->i_fragtree); 171 172 dout("get_or_create_frag added %llx.%llx frag %x\n", 173 ceph_vinop(&ci->vfs_inode), f); 174 return frag; 175 } 176 177 /* 178 * find a specific frag @f 179 */ 180 struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci, u32 f) 181 { 182 struct rb_node *n = ci->i_fragtree.rb_node; 183 184 while (n) { 185 struct ceph_inode_frag *frag = 186 rb_entry(n, struct ceph_inode_frag, node); 187 int c = ceph_frag_compare(f, frag->frag); 188 if (c < 0) 189 n = n->rb_left; 190 else if (c > 0) 191 n = n->rb_right; 192 else 193 return frag; 194 } 195 return NULL; 196 } 197 198 /* 199 * Choose frag containing the given value @v. If @pfrag is 200 * specified, copy the frag delegation info to the caller if 201 * it is present. 202 */ 203 static u32 __ceph_choose_frag(struct ceph_inode_info *ci, u32 v, 204 struct ceph_inode_frag *pfrag, int *found) 205 { 206 u32 t = ceph_frag_make(0, 0); 207 struct ceph_inode_frag *frag; 208 unsigned nway, i; 209 u32 n; 210 211 if (found) 212 *found = 0; 213 214 while (1) { 215 WARN_ON(!ceph_frag_contains_value(t, v)); 216 frag = __ceph_find_frag(ci, t); 217 if (!frag) 218 break; /* t is a leaf */ 219 if (frag->split_by == 0) { 220 if (pfrag) 221 memcpy(pfrag, frag, sizeof(*pfrag)); 222 if (found) 223 *found = 1; 224 break; 225 } 226 227 /* choose child */ 228 nway = 1 << frag->split_by; 229 dout("choose_frag(%x) %x splits by %d (%d ways)\n", v, t, 230 frag->split_by, nway); 231 for (i = 0; i < nway; i++) { 232 n = ceph_frag_make_child(t, frag->split_by, i); 233 if (ceph_frag_contains_value(n, v)) { 234 t = n; 235 break; 236 } 237 } 238 BUG_ON(i == nway); 239 } 240 dout("choose_frag(%x) = %x\n", v, t); 241 242 return t; 243 } 244 245 u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v, 246 struct ceph_inode_frag *pfrag, int *found) 247 { 248 u32 ret; 249 mutex_lock(&ci->i_fragtree_mutex); 250 ret = __ceph_choose_frag(ci, v, pfrag, found); 251 mutex_unlock(&ci->i_fragtree_mutex); 252 return ret; 253 } 254 255 /* 256 * Process dirfrag (delegation) info from the mds. Include leaf 257 * fragment in tree ONLY if ndist > 0. Otherwise, only 258 * branches/splits are included in i_fragtree) 259 */ 260 static int ceph_fill_dirfrag(struct inode *inode, 261 struct ceph_mds_reply_dirfrag *dirinfo) 262 { 263 struct ceph_inode_info *ci = ceph_inode(inode); 264 struct ceph_inode_frag *frag; 265 u32 id = le32_to_cpu(dirinfo->frag); 266 int mds = le32_to_cpu(dirinfo->auth); 267 int ndist = le32_to_cpu(dirinfo->ndist); 268 int diri_auth = -1; 269 int i; 270 int err = 0; 271 272 spin_lock(&ci->i_ceph_lock); 273 if (ci->i_auth_cap) 274 diri_auth = ci->i_auth_cap->mds; 275 spin_unlock(&ci->i_ceph_lock); 276 277 if (mds == -1) /* CDIR_AUTH_PARENT */ 278 mds = diri_auth; 279 280 mutex_lock(&ci->i_fragtree_mutex); 281 if (ndist == 0 && mds == diri_auth) { 282 /* no delegation info needed. */ 283 frag = __ceph_find_frag(ci, id); 284 if (!frag) 285 goto out; 286 if (frag->split_by == 0) { 287 /* tree leaf, remove */ 288 dout("fill_dirfrag removed %llx.%llx frag %x" 289 " (no ref)\n", ceph_vinop(inode), id); 290 rb_erase(&frag->node, &ci->i_fragtree); 291 kfree(frag); 292 } else { 293 /* tree branch, keep and clear */ 294 dout("fill_dirfrag cleared %llx.%llx frag %x" 295 " referral\n", ceph_vinop(inode), id); 296 frag->mds = -1; 297 frag->ndist = 0; 298 } 299 goto out; 300 } 301 302 303 /* find/add this frag to store mds delegation info */ 304 frag = __get_or_create_frag(ci, id); 305 if (IS_ERR(frag)) { 306 /* this is not the end of the world; we can continue 307 with bad/inaccurate delegation info */ 308 pr_err("fill_dirfrag ENOMEM on mds ref %llx.%llx fg %x\n", 309 ceph_vinop(inode), le32_to_cpu(dirinfo->frag)); 310 err = -ENOMEM; 311 goto out; 312 } 313 314 frag->mds = mds; 315 frag->ndist = min_t(u32, ndist, CEPH_MAX_DIRFRAG_REP); 316 for (i = 0; i < frag->ndist; i++) 317 frag->dist[i] = le32_to_cpu(dirinfo->dist[i]); 318 dout("fill_dirfrag %llx.%llx frag %x ndist=%d\n", 319 ceph_vinop(inode), frag->frag, frag->ndist); 320 321 out: 322 mutex_unlock(&ci->i_fragtree_mutex); 323 return err; 324 } 325 326 static int frag_tree_split_cmp(const void *l, const void *r) 327 { 328 struct ceph_frag_tree_split *ls = (struct ceph_frag_tree_split*)l; 329 struct ceph_frag_tree_split *rs = (struct ceph_frag_tree_split*)r; 330 return ceph_frag_compare(le32_to_cpu(ls->frag), 331 le32_to_cpu(rs->frag)); 332 } 333 334 static bool is_frag_child(u32 f, struct ceph_inode_frag *frag) 335 { 336 if (!frag) 337 return f == ceph_frag_make(0, 0); 338 if (ceph_frag_bits(f) != ceph_frag_bits(frag->frag) + frag->split_by) 339 return false; 340 return ceph_frag_contains_value(frag->frag, ceph_frag_value(f)); 341 } 342 343 static int ceph_fill_fragtree(struct inode *inode, 344 struct ceph_frag_tree_head *fragtree, 345 struct ceph_mds_reply_dirfrag *dirinfo) 346 { 347 struct ceph_inode_info *ci = ceph_inode(inode); 348 struct ceph_inode_frag *frag, *prev_frag = NULL; 349 struct rb_node *rb_node; 350 unsigned i, split_by, nsplits; 351 u32 id; 352 bool update = false; 353 354 mutex_lock(&ci->i_fragtree_mutex); 355 nsplits = le32_to_cpu(fragtree->nsplits); 356 if (nsplits != ci->i_fragtree_nsplits) { 357 update = true; 358 } else if (nsplits) { 359 i = prandom_u32() % nsplits; 360 id = le32_to_cpu(fragtree->splits[i].frag); 361 if (!__ceph_find_frag(ci, id)) 362 update = true; 363 } else if (!RB_EMPTY_ROOT(&ci->i_fragtree)) { 364 rb_node = rb_first(&ci->i_fragtree); 365 frag = rb_entry(rb_node, struct ceph_inode_frag, node); 366 if (frag->frag != ceph_frag_make(0, 0) || rb_next(rb_node)) 367 update = true; 368 } 369 if (!update && dirinfo) { 370 id = le32_to_cpu(dirinfo->frag); 371 if (id != __ceph_choose_frag(ci, id, NULL, NULL)) 372 update = true; 373 } 374 if (!update) 375 goto out_unlock; 376 377 if (nsplits > 1) { 378 sort(fragtree->splits, nsplits, sizeof(fragtree->splits[0]), 379 frag_tree_split_cmp, NULL); 380 } 381 382 dout("fill_fragtree %llx.%llx\n", ceph_vinop(inode)); 383 rb_node = rb_first(&ci->i_fragtree); 384 for (i = 0; i < nsplits; i++) { 385 id = le32_to_cpu(fragtree->splits[i].frag); 386 split_by = le32_to_cpu(fragtree->splits[i].by); 387 if (split_by == 0 || ceph_frag_bits(id) + split_by > 24) { 388 pr_err("fill_fragtree %llx.%llx invalid split %d/%u, " 389 "frag %x split by %d\n", ceph_vinop(inode), 390 i, nsplits, id, split_by); 391 continue; 392 } 393 frag = NULL; 394 while (rb_node) { 395 frag = rb_entry(rb_node, struct ceph_inode_frag, node); 396 if (ceph_frag_compare(frag->frag, id) >= 0) { 397 if (frag->frag != id) 398 frag = NULL; 399 else 400 rb_node = rb_next(rb_node); 401 break; 402 } 403 rb_node = rb_next(rb_node); 404 /* delete stale split/leaf node */ 405 if (frag->split_by > 0 || 406 !is_frag_child(frag->frag, prev_frag)) { 407 rb_erase(&frag->node, &ci->i_fragtree); 408 if (frag->split_by > 0) 409 ci->i_fragtree_nsplits--; 410 kfree(frag); 411 } 412 frag = NULL; 413 } 414 if (!frag) { 415 frag = __get_or_create_frag(ci, id); 416 if (IS_ERR(frag)) 417 continue; 418 } 419 if (frag->split_by == 0) 420 ci->i_fragtree_nsplits++; 421 frag->split_by = split_by; 422 dout(" frag %x split by %d\n", frag->frag, frag->split_by); 423 prev_frag = frag; 424 } 425 while (rb_node) { 426 frag = rb_entry(rb_node, struct ceph_inode_frag, node); 427 rb_node = rb_next(rb_node); 428 /* delete stale split/leaf node */ 429 if (frag->split_by > 0 || 430 !is_frag_child(frag->frag, prev_frag)) { 431 rb_erase(&frag->node, &ci->i_fragtree); 432 if (frag->split_by > 0) 433 ci->i_fragtree_nsplits--; 434 kfree(frag); 435 } 436 } 437 out_unlock: 438 mutex_unlock(&ci->i_fragtree_mutex); 439 return 0; 440 } 441 442 /* 443 * initialize a newly allocated inode. 444 */ 445 struct inode *ceph_alloc_inode(struct super_block *sb) 446 { 447 struct ceph_inode_info *ci; 448 int i; 449 450 ci = kmem_cache_alloc(ceph_inode_cachep, GFP_NOFS); 451 if (!ci) 452 return NULL; 453 454 dout("alloc_inode %p\n", &ci->vfs_inode); 455 456 spin_lock_init(&ci->i_ceph_lock); 457 458 ci->i_version = 0; 459 ci->i_inline_version = 0; 460 ci->i_time_warp_seq = 0; 461 ci->i_ceph_flags = 0; 462 atomic64_set(&ci->i_ordered_count, 1); 463 atomic64_set(&ci->i_release_count, 1); 464 atomic64_set(&ci->i_complete_seq[0], 0); 465 atomic64_set(&ci->i_complete_seq[1], 0); 466 ci->i_symlink = NULL; 467 468 ci->i_max_bytes = 0; 469 ci->i_max_files = 0; 470 471 memset(&ci->i_dir_layout, 0, sizeof(ci->i_dir_layout)); 472 memset(&ci->i_cached_layout, 0, sizeof(ci->i_cached_layout)); 473 RCU_INIT_POINTER(ci->i_layout.pool_ns, NULL); 474 475 ci->i_fragtree = RB_ROOT; 476 mutex_init(&ci->i_fragtree_mutex); 477 478 ci->i_xattrs.blob = NULL; 479 ci->i_xattrs.prealloc_blob = NULL; 480 ci->i_xattrs.dirty = false; 481 ci->i_xattrs.index = RB_ROOT; 482 ci->i_xattrs.count = 0; 483 ci->i_xattrs.names_size = 0; 484 ci->i_xattrs.vals_size = 0; 485 ci->i_xattrs.version = 0; 486 ci->i_xattrs.index_version = 0; 487 488 ci->i_caps = RB_ROOT; 489 ci->i_auth_cap = NULL; 490 ci->i_dirty_caps = 0; 491 ci->i_flushing_caps = 0; 492 INIT_LIST_HEAD(&ci->i_dirty_item); 493 INIT_LIST_HEAD(&ci->i_flushing_item); 494 ci->i_prealloc_cap_flush = NULL; 495 INIT_LIST_HEAD(&ci->i_cap_flush_list); 496 init_waitqueue_head(&ci->i_cap_wq); 497 ci->i_hold_caps_max = 0; 498 INIT_LIST_HEAD(&ci->i_cap_delay_list); 499 INIT_LIST_HEAD(&ci->i_cap_snaps); 500 ci->i_head_snapc = NULL; 501 ci->i_snap_caps = 0; 502 503 ci->i_last_rd = ci->i_last_wr = jiffies - 3600 * HZ; 504 for (i = 0; i < CEPH_FILE_MODE_BITS; i++) 505 ci->i_nr_by_mode[i] = 0; 506 507 mutex_init(&ci->i_truncate_mutex); 508 ci->i_truncate_seq = 0; 509 ci->i_truncate_size = 0; 510 ci->i_truncate_pending = 0; 511 512 ci->i_max_size = 0; 513 ci->i_reported_size = 0; 514 ci->i_wanted_max_size = 0; 515 ci->i_requested_max_size = 0; 516 517 ci->i_pin_ref = 0; 518 ci->i_rd_ref = 0; 519 ci->i_rdcache_ref = 0; 520 ci->i_wr_ref = 0; 521 ci->i_wb_ref = 0; 522 ci->i_fx_ref = 0; 523 ci->i_wrbuffer_ref = 0; 524 ci->i_wrbuffer_ref_head = 0; 525 atomic_set(&ci->i_filelock_ref, 0); 526 atomic_set(&ci->i_shared_gen, 1); 527 ci->i_rdcache_gen = 0; 528 ci->i_rdcache_revoking = 0; 529 530 INIT_LIST_HEAD(&ci->i_unsafe_dirops); 531 INIT_LIST_HEAD(&ci->i_unsafe_iops); 532 spin_lock_init(&ci->i_unsafe_lock); 533 534 ci->i_snap_realm = NULL; 535 INIT_LIST_HEAD(&ci->i_snap_realm_item); 536 INIT_LIST_HEAD(&ci->i_snap_flush_item); 537 538 INIT_WORK(&ci->i_work, ceph_inode_work); 539 ci->i_work_mask = 0; 540 memset(&ci->i_btime, '\0', sizeof(ci->i_btime)); 541 542 ceph_fscache_inode_init(ci); 543 544 ci->i_meta_err = 0; 545 546 return &ci->vfs_inode; 547 } 548 549 void ceph_free_inode(struct inode *inode) 550 { 551 struct ceph_inode_info *ci = ceph_inode(inode); 552 553 kfree(ci->i_symlink); 554 kmem_cache_free(ceph_inode_cachep, ci); 555 } 556 557 void ceph_evict_inode(struct inode *inode) 558 { 559 struct ceph_inode_info *ci = ceph_inode(inode); 560 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb); 561 struct ceph_inode_frag *frag; 562 struct rb_node *n; 563 564 dout("evict_inode %p ino %llx.%llx\n", inode, ceph_vinop(inode)); 565 566 percpu_counter_dec(&mdsc->metric.total_inodes); 567 568 truncate_inode_pages_final(&inode->i_data); 569 clear_inode(inode); 570 571 ceph_fscache_unregister_inode_cookie(ci); 572 573 __ceph_remove_caps(ci); 574 575 if (__ceph_has_any_quota(ci)) 576 ceph_adjust_quota_realms_count(inode, false); 577 578 /* 579 * we may still have a snap_realm reference if there are stray 580 * caps in i_snap_caps. 581 */ 582 if (ci->i_snap_realm) { 583 if (ceph_snap(inode) == CEPH_NOSNAP) { 584 struct ceph_snap_realm *realm = ci->i_snap_realm; 585 dout(" dropping residual ref to snap realm %p\n", 586 realm); 587 spin_lock(&realm->inodes_with_caps_lock); 588 list_del_init(&ci->i_snap_realm_item); 589 ci->i_snap_realm = NULL; 590 if (realm->ino == ci->i_vino.ino) 591 realm->inode = NULL; 592 spin_unlock(&realm->inodes_with_caps_lock); 593 ceph_put_snap_realm(mdsc, realm); 594 } else { 595 ceph_put_snapid_map(mdsc, ci->i_snapid_map); 596 ci->i_snap_realm = NULL; 597 } 598 } 599 600 while ((n = rb_first(&ci->i_fragtree)) != NULL) { 601 frag = rb_entry(n, struct ceph_inode_frag, node); 602 rb_erase(n, &ci->i_fragtree); 603 kfree(frag); 604 } 605 ci->i_fragtree_nsplits = 0; 606 607 __ceph_destroy_xattrs(ci); 608 if (ci->i_xattrs.blob) 609 ceph_buffer_put(ci->i_xattrs.blob); 610 if (ci->i_xattrs.prealloc_blob) 611 ceph_buffer_put(ci->i_xattrs.prealloc_blob); 612 613 ceph_put_string(rcu_dereference_raw(ci->i_layout.pool_ns)); 614 ceph_put_string(rcu_dereference_raw(ci->i_cached_layout.pool_ns)); 615 } 616 617 static inline blkcnt_t calc_inode_blocks(u64 size) 618 { 619 return (size + (1<<9) - 1) >> 9; 620 } 621 622 /* 623 * Helpers to fill in size, ctime, mtime, and atime. We have to be 624 * careful because either the client or MDS may have more up to date 625 * info, depending on which capabilities are held, and whether 626 * time_warp_seq or truncate_seq have increased. (Ordinarily, mtime 627 * and size are monotonically increasing, except when utimes() or 628 * truncate() increments the corresponding _seq values.) 629 */ 630 int ceph_fill_file_size(struct inode *inode, int issued, 631 u32 truncate_seq, u64 truncate_size, u64 size) 632 { 633 struct ceph_inode_info *ci = ceph_inode(inode); 634 int queue_trunc = 0; 635 loff_t isize = i_size_read(inode); 636 637 if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) > 0 || 638 (truncate_seq == ci->i_truncate_seq && size > isize)) { 639 dout("size %lld -> %llu\n", isize, size); 640 if (size > 0 && S_ISDIR(inode->i_mode)) { 641 pr_err("fill_file_size non-zero size for directory\n"); 642 size = 0; 643 } 644 i_size_write(inode, size); 645 inode->i_blocks = calc_inode_blocks(size); 646 ci->i_reported_size = size; 647 if (truncate_seq != ci->i_truncate_seq) { 648 dout("truncate_seq %u -> %u\n", 649 ci->i_truncate_seq, truncate_seq); 650 ci->i_truncate_seq = truncate_seq; 651 652 /* the MDS should have revoked these caps */ 653 WARN_ON_ONCE(issued & (CEPH_CAP_FILE_EXCL | 654 CEPH_CAP_FILE_RD | 655 CEPH_CAP_FILE_WR | 656 CEPH_CAP_FILE_LAZYIO)); 657 /* 658 * If we hold relevant caps, or in the case where we're 659 * not the only client referencing this file and we 660 * don't hold those caps, then we need to check whether 661 * the file is either opened or mmaped 662 */ 663 if ((issued & (CEPH_CAP_FILE_CACHE| 664 CEPH_CAP_FILE_BUFFER)) || 665 mapping_mapped(inode->i_mapping) || 666 __ceph_is_file_opened(ci)) { 667 ci->i_truncate_pending++; 668 queue_trunc = 1; 669 } 670 } 671 } 672 if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) >= 0 && 673 ci->i_truncate_size != truncate_size) { 674 dout("truncate_size %lld -> %llu\n", ci->i_truncate_size, 675 truncate_size); 676 ci->i_truncate_size = truncate_size; 677 } 678 679 if (queue_trunc) 680 ceph_fscache_invalidate(inode); 681 682 return queue_trunc; 683 } 684 685 void ceph_fill_file_time(struct inode *inode, int issued, 686 u64 time_warp_seq, struct timespec64 *ctime, 687 struct timespec64 *mtime, struct timespec64 *atime) 688 { 689 struct ceph_inode_info *ci = ceph_inode(inode); 690 int warn = 0; 691 692 if (issued & (CEPH_CAP_FILE_EXCL| 693 CEPH_CAP_FILE_WR| 694 CEPH_CAP_FILE_BUFFER| 695 CEPH_CAP_AUTH_EXCL| 696 CEPH_CAP_XATTR_EXCL)) { 697 if (ci->i_version == 0 || 698 timespec64_compare(ctime, &inode->i_ctime) > 0) { 699 dout("ctime %lld.%09ld -> %lld.%09ld inc w/ cap\n", 700 inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec, 701 ctime->tv_sec, ctime->tv_nsec); 702 inode->i_ctime = *ctime; 703 } 704 if (ci->i_version == 0 || 705 ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) > 0) { 706 /* the MDS did a utimes() */ 707 dout("mtime %lld.%09ld -> %lld.%09ld " 708 "tw %d -> %d\n", 709 inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec, 710 mtime->tv_sec, mtime->tv_nsec, 711 ci->i_time_warp_seq, (int)time_warp_seq); 712 713 inode->i_mtime = *mtime; 714 inode->i_atime = *atime; 715 ci->i_time_warp_seq = time_warp_seq; 716 } else if (time_warp_seq == ci->i_time_warp_seq) { 717 /* nobody did utimes(); take the max */ 718 if (timespec64_compare(mtime, &inode->i_mtime) > 0) { 719 dout("mtime %lld.%09ld -> %lld.%09ld inc\n", 720 inode->i_mtime.tv_sec, 721 inode->i_mtime.tv_nsec, 722 mtime->tv_sec, mtime->tv_nsec); 723 inode->i_mtime = *mtime; 724 } 725 if (timespec64_compare(atime, &inode->i_atime) > 0) { 726 dout("atime %lld.%09ld -> %lld.%09ld inc\n", 727 inode->i_atime.tv_sec, 728 inode->i_atime.tv_nsec, 729 atime->tv_sec, atime->tv_nsec); 730 inode->i_atime = *atime; 731 } 732 } else if (issued & CEPH_CAP_FILE_EXCL) { 733 /* we did a utimes(); ignore mds values */ 734 } else { 735 warn = 1; 736 } 737 } else { 738 /* we have no write|excl caps; whatever the MDS says is true */ 739 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) >= 0) { 740 inode->i_ctime = *ctime; 741 inode->i_mtime = *mtime; 742 inode->i_atime = *atime; 743 ci->i_time_warp_seq = time_warp_seq; 744 } else { 745 warn = 1; 746 } 747 } 748 if (warn) /* time_warp_seq shouldn't go backwards */ 749 dout("%p mds time_warp_seq %llu < %u\n", 750 inode, time_warp_seq, ci->i_time_warp_seq); 751 } 752 753 /* 754 * Populate an inode based on info from mds. May be called on new or 755 * existing inodes. 756 */ 757 int ceph_fill_inode(struct inode *inode, struct page *locked_page, 758 struct ceph_mds_reply_info_in *iinfo, 759 struct ceph_mds_reply_dirfrag *dirinfo, 760 struct ceph_mds_session *session, int cap_fmode, 761 struct ceph_cap_reservation *caps_reservation) 762 { 763 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb); 764 struct ceph_mds_reply_inode *info = iinfo->in; 765 struct ceph_inode_info *ci = ceph_inode(inode); 766 int issued, new_issued, info_caps; 767 struct timespec64 mtime, atime, ctime; 768 struct ceph_buffer *xattr_blob = NULL; 769 struct ceph_buffer *old_blob = NULL; 770 struct ceph_string *pool_ns = NULL; 771 struct ceph_cap *new_cap = NULL; 772 int err = 0; 773 bool wake = false; 774 bool queue_trunc = false; 775 bool new_version = false; 776 bool fill_inline = false; 777 umode_t mode = le32_to_cpu(info->mode); 778 dev_t rdev = le32_to_cpu(info->rdev); 779 780 lockdep_assert_held(&mdsc->snap_rwsem); 781 782 dout("%s %p ino %llx.%llx v %llu had %llu\n", __func__, 783 inode, ceph_vinop(inode), le64_to_cpu(info->version), 784 ci->i_version); 785 786 /* Once I_NEW is cleared, we can't change type or dev numbers */ 787 if (inode->i_state & I_NEW) { 788 inode->i_mode = mode; 789 } else { 790 if (inode_wrong_type(inode, mode)) { 791 pr_warn_once("inode type changed! (ino %llx.%llx is 0%o, mds says 0%o)\n", 792 ceph_vinop(inode), inode->i_mode, mode); 793 return -ESTALE; 794 } 795 796 if ((S_ISCHR(mode) || S_ISBLK(mode)) && inode->i_rdev != rdev) { 797 pr_warn_once("dev inode rdev changed! (ino %llx.%llx is %u:%u, mds says %u:%u)\n", 798 ceph_vinop(inode), MAJOR(inode->i_rdev), 799 MINOR(inode->i_rdev), MAJOR(rdev), 800 MINOR(rdev)); 801 return -ESTALE; 802 } 803 } 804 805 info_caps = le32_to_cpu(info->cap.caps); 806 807 /* prealloc new cap struct */ 808 if (info_caps && ceph_snap(inode) == CEPH_NOSNAP) { 809 new_cap = ceph_get_cap(mdsc, caps_reservation); 810 if (!new_cap) 811 return -ENOMEM; 812 } 813 814 /* 815 * prealloc xattr data, if it looks like we'll need it. only 816 * if len > 4 (meaning there are actually xattrs; the first 4 817 * bytes are the xattr count). 818 */ 819 if (iinfo->xattr_len > 4) { 820 xattr_blob = ceph_buffer_new(iinfo->xattr_len, GFP_NOFS); 821 if (!xattr_blob) 822 pr_err("%s ENOMEM xattr blob %d bytes\n", __func__, 823 iinfo->xattr_len); 824 } 825 826 if (iinfo->pool_ns_len > 0) 827 pool_ns = ceph_find_or_create_string(iinfo->pool_ns_data, 828 iinfo->pool_ns_len); 829 830 if (ceph_snap(inode) != CEPH_NOSNAP && !ci->i_snapid_map) 831 ci->i_snapid_map = ceph_get_snapid_map(mdsc, ceph_snap(inode)); 832 833 spin_lock(&ci->i_ceph_lock); 834 835 /* 836 * provided version will be odd if inode value is projected, 837 * even if stable. skip the update if we have newer stable 838 * info (ours>=theirs, e.g. due to racing mds replies), unless 839 * we are getting projected (unstable) info (in which case the 840 * version is odd, and we want ours>theirs). 841 * us them 842 * 2 2 skip 843 * 3 2 skip 844 * 3 3 update 845 */ 846 if (ci->i_version == 0 || 847 ((info->cap.flags & CEPH_CAP_FLAG_AUTH) && 848 le64_to_cpu(info->version) > (ci->i_version & ~1))) 849 new_version = true; 850 851 /* Update change_attribute */ 852 inode_set_max_iversion_raw(inode, iinfo->change_attr); 853 854 __ceph_caps_issued(ci, &issued); 855 issued |= __ceph_caps_dirty(ci); 856 new_issued = ~issued & info_caps; 857 858 /* directories have fl_stripe_unit set to zero */ 859 if (le32_to_cpu(info->layout.fl_stripe_unit)) 860 inode->i_blkbits = 861 fls(le32_to_cpu(info->layout.fl_stripe_unit)) - 1; 862 else 863 inode->i_blkbits = CEPH_BLOCK_SHIFT; 864 865 __ceph_update_quota(ci, iinfo->max_bytes, iinfo->max_files); 866 867 if ((new_version || (new_issued & CEPH_CAP_AUTH_SHARED)) && 868 (issued & CEPH_CAP_AUTH_EXCL) == 0) { 869 inode->i_mode = mode; 870 inode->i_uid = make_kuid(&init_user_ns, le32_to_cpu(info->uid)); 871 inode->i_gid = make_kgid(&init_user_ns, le32_to_cpu(info->gid)); 872 dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode, 873 from_kuid(&init_user_ns, inode->i_uid), 874 from_kgid(&init_user_ns, inode->i_gid)); 875 ceph_decode_timespec64(&ci->i_btime, &iinfo->btime); 876 ceph_decode_timespec64(&ci->i_snap_btime, &iinfo->snap_btime); 877 } 878 879 if ((new_version || (new_issued & CEPH_CAP_LINK_SHARED)) && 880 (issued & CEPH_CAP_LINK_EXCL) == 0) 881 set_nlink(inode, le32_to_cpu(info->nlink)); 882 883 if (new_version || (new_issued & CEPH_CAP_ANY_RD)) { 884 /* be careful with mtime, atime, size */ 885 ceph_decode_timespec64(&atime, &info->atime); 886 ceph_decode_timespec64(&mtime, &info->mtime); 887 ceph_decode_timespec64(&ctime, &info->ctime); 888 ceph_fill_file_time(inode, issued, 889 le32_to_cpu(info->time_warp_seq), 890 &ctime, &mtime, &atime); 891 } 892 893 if (new_version || (info_caps & CEPH_CAP_FILE_SHARED)) { 894 ci->i_files = le64_to_cpu(info->files); 895 ci->i_subdirs = le64_to_cpu(info->subdirs); 896 } 897 898 if (new_version || 899 (new_issued & (CEPH_CAP_ANY_FILE_RD | CEPH_CAP_ANY_FILE_WR))) { 900 s64 old_pool = ci->i_layout.pool_id; 901 struct ceph_string *old_ns; 902 903 ceph_file_layout_from_legacy(&ci->i_layout, &info->layout); 904 old_ns = rcu_dereference_protected(ci->i_layout.pool_ns, 905 lockdep_is_held(&ci->i_ceph_lock)); 906 rcu_assign_pointer(ci->i_layout.pool_ns, pool_ns); 907 908 if (ci->i_layout.pool_id != old_pool || pool_ns != old_ns) 909 ci->i_ceph_flags &= ~CEPH_I_POOL_PERM; 910 911 pool_ns = old_ns; 912 913 queue_trunc = ceph_fill_file_size(inode, issued, 914 le32_to_cpu(info->truncate_seq), 915 le64_to_cpu(info->truncate_size), 916 le64_to_cpu(info->size)); 917 /* only update max_size on auth cap */ 918 if ((info->cap.flags & CEPH_CAP_FLAG_AUTH) && 919 ci->i_max_size != le64_to_cpu(info->max_size)) { 920 dout("max_size %lld -> %llu\n", ci->i_max_size, 921 le64_to_cpu(info->max_size)); 922 ci->i_max_size = le64_to_cpu(info->max_size); 923 } 924 } 925 926 /* layout and rstat are not tracked by capability, update them if 927 * the inode info is from auth mds */ 928 if (new_version || (info->cap.flags & CEPH_CAP_FLAG_AUTH)) { 929 if (S_ISDIR(inode->i_mode)) { 930 ci->i_dir_layout = iinfo->dir_layout; 931 ci->i_rbytes = le64_to_cpu(info->rbytes); 932 ci->i_rfiles = le64_to_cpu(info->rfiles); 933 ci->i_rsubdirs = le64_to_cpu(info->rsubdirs); 934 ci->i_dir_pin = iinfo->dir_pin; 935 ci->i_rsnaps = iinfo->rsnaps; 936 ceph_decode_timespec64(&ci->i_rctime, &info->rctime); 937 } 938 } 939 940 /* xattrs */ 941 /* note that if i_xattrs.len <= 4, i_xattrs.data will still be NULL. */ 942 if ((ci->i_xattrs.version == 0 || !(issued & CEPH_CAP_XATTR_EXCL)) && 943 le64_to_cpu(info->xattr_version) > ci->i_xattrs.version) { 944 if (ci->i_xattrs.blob) 945 old_blob = ci->i_xattrs.blob; 946 ci->i_xattrs.blob = xattr_blob; 947 if (xattr_blob) 948 memcpy(ci->i_xattrs.blob->vec.iov_base, 949 iinfo->xattr_data, iinfo->xattr_len); 950 ci->i_xattrs.version = le64_to_cpu(info->xattr_version); 951 ceph_forget_all_cached_acls(inode); 952 ceph_security_invalidate_secctx(inode); 953 xattr_blob = NULL; 954 } 955 956 /* finally update i_version */ 957 if (le64_to_cpu(info->version) > ci->i_version) 958 ci->i_version = le64_to_cpu(info->version); 959 960 inode->i_mapping->a_ops = &ceph_aops; 961 962 switch (inode->i_mode & S_IFMT) { 963 case S_IFIFO: 964 case S_IFBLK: 965 case S_IFCHR: 966 case S_IFSOCK: 967 inode->i_blkbits = PAGE_SHIFT; 968 init_special_inode(inode, inode->i_mode, rdev); 969 inode->i_op = &ceph_file_iops; 970 break; 971 case S_IFREG: 972 inode->i_op = &ceph_file_iops; 973 inode->i_fop = &ceph_file_fops; 974 break; 975 case S_IFLNK: 976 inode->i_op = &ceph_symlink_iops; 977 if (!ci->i_symlink) { 978 u32 symlen = iinfo->symlink_len; 979 char *sym; 980 981 spin_unlock(&ci->i_ceph_lock); 982 983 if (symlen != i_size_read(inode)) { 984 pr_err("%s %llx.%llx BAD symlink " 985 "size %lld\n", __func__, 986 ceph_vinop(inode), 987 i_size_read(inode)); 988 i_size_write(inode, symlen); 989 inode->i_blocks = calc_inode_blocks(symlen); 990 } 991 992 err = -ENOMEM; 993 sym = kstrndup(iinfo->symlink, symlen, GFP_NOFS); 994 if (!sym) 995 goto out; 996 997 spin_lock(&ci->i_ceph_lock); 998 if (!ci->i_symlink) 999 ci->i_symlink = sym; 1000 else 1001 kfree(sym); /* lost a race */ 1002 } 1003 inode->i_link = ci->i_symlink; 1004 break; 1005 case S_IFDIR: 1006 inode->i_op = &ceph_dir_iops; 1007 inode->i_fop = &ceph_dir_fops; 1008 break; 1009 default: 1010 pr_err("%s %llx.%llx BAD mode 0%o\n", __func__, 1011 ceph_vinop(inode), inode->i_mode); 1012 } 1013 1014 /* were we issued a capability? */ 1015 if (info_caps) { 1016 if (ceph_snap(inode) == CEPH_NOSNAP) { 1017 ceph_add_cap(inode, session, 1018 le64_to_cpu(info->cap.cap_id), 1019 info_caps, 1020 le32_to_cpu(info->cap.wanted), 1021 le32_to_cpu(info->cap.seq), 1022 le32_to_cpu(info->cap.mseq), 1023 le64_to_cpu(info->cap.realm), 1024 info->cap.flags, &new_cap); 1025 1026 /* set dir completion flag? */ 1027 if (S_ISDIR(inode->i_mode) && 1028 ci->i_files == 0 && ci->i_subdirs == 0 && 1029 (info_caps & CEPH_CAP_FILE_SHARED) && 1030 (issued & CEPH_CAP_FILE_EXCL) == 0 && 1031 !__ceph_dir_is_complete(ci)) { 1032 dout(" marking %p complete (empty)\n", inode); 1033 i_size_write(inode, 0); 1034 __ceph_dir_set_complete(ci, 1035 atomic64_read(&ci->i_release_count), 1036 atomic64_read(&ci->i_ordered_count)); 1037 } 1038 1039 wake = true; 1040 } else { 1041 dout(" %p got snap_caps %s\n", inode, 1042 ceph_cap_string(info_caps)); 1043 ci->i_snap_caps |= info_caps; 1044 } 1045 } 1046 1047 if (iinfo->inline_version > 0 && 1048 iinfo->inline_version >= ci->i_inline_version) { 1049 int cache_caps = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO; 1050 ci->i_inline_version = iinfo->inline_version; 1051 if (ci->i_inline_version != CEPH_INLINE_NONE && 1052 (locked_page || (info_caps & cache_caps))) 1053 fill_inline = true; 1054 } 1055 1056 if (cap_fmode >= 0) { 1057 if (!info_caps) 1058 pr_warn("mds issued no caps on %llx.%llx\n", 1059 ceph_vinop(inode)); 1060 __ceph_touch_fmode(ci, mdsc, cap_fmode); 1061 } 1062 1063 spin_unlock(&ci->i_ceph_lock); 1064 1065 if (fill_inline) 1066 ceph_fill_inline_data(inode, locked_page, 1067 iinfo->inline_data, iinfo->inline_len); 1068 1069 if (wake) 1070 wake_up_all(&ci->i_cap_wq); 1071 1072 /* queue truncate if we saw i_size decrease */ 1073 if (queue_trunc) 1074 ceph_queue_vmtruncate(inode); 1075 1076 /* populate frag tree */ 1077 if (S_ISDIR(inode->i_mode)) 1078 ceph_fill_fragtree(inode, &info->fragtree, dirinfo); 1079 1080 /* update delegation info? */ 1081 if (dirinfo) 1082 ceph_fill_dirfrag(inode, dirinfo); 1083 1084 err = 0; 1085 out: 1086 if (new_cap) 1087 ceph_put_cap(mdsc, new_cap); 1088 ceph_buffer_put(old_blob); 1089 ceph_buffer_put(xattr_blob); 1090 ceph_put_string(pool_ns); 1091 return err; 1092 } 1093 1094 /* 1095 * caller should hold session s_mutex and dentry->d_lock. 1096 */ 1097 static void __update_dentry_lease(struct inode *dir, struct dentry *dentry, 1098 struct ceph_mds_reply_lease *lease, 1099 struct ceph_mds_session *session, 1100 unsigned long from_time, 1101 struct ceph_mds_session **old_lease_session) 1102 { 1103 struct ceph_dentry_info *di = ceph_dentry(dentry); 1104 unsigned mask = le16_to_cpu(lease->mask); 1105 long unsigned duration = le32_to_cpu(lease->duration_ms); 1106 long unsigned ttl = from_time + (duration * HZ) / 1000; 1107 long unsigned half_ttl = from_time + (duration * HZ / 2) / 1000; 1108 1109 dout("update_dentry_lease %p duration %lu ms ttl %lu\n", 1110 dentry, duration, ttl); 1111 1112 /* only track leases on regular dentries */ 1113 if (ceph_snap(dir) != CEPH_NOSNAP) 1114 return; 1115 1116 if (mask & CEPH_LEASE_PRIMARY_LINK) 1117 di->flags |= CEPH_DENTRY_PRIMARY_LINK; 1118 else 1119 di->flags &= ~CEPH_DENTRY_PRIMARY_LINK; 1120 1121 di->lease_shared_gen = atomic_read(&ceph_inode(dir)->i_shared_gen); 1122 if (!(mask & CEPH_LEASE_VALID)) { 1123 __ceph_dentry_dir_lease_touch(di); 1124 return; 1125 } 1126 1127 if (di->lease_gen == session->s_cap_gen && 1128 time_before(ttl, di->time)) 1129 return; /* we already have a newer lease. */ 1130 1131 if (di->lease_session && di->lease_session != session) { 1132 *old_lease_session = di->lease_session; 1133 di->lease_session = NULL; 1134 } 1135 1136 if (!di->lease_session) 1137 di->lease_session = ceph_get_mds_session(session); 1138 di->lease_gen = session->s_cap_gen; 1139 di->lease_seq = le32_to_cpu(lease->seq); 1140 di->lease_renew_after = half_ttl; 1141 di->lease_renew_from = 0; 1142 di->time = ttl; 1143 1144 __ceph_dentry_lease_touch(di); 1145 } 1146 1147 static inline void update_dentry_lease(struct inode *dir, struct dentry *dentry, 1148 struct ceph_mds_reply_lease *lease, 1149 struct ceph_mds_session *session, 1150 unsigned long from_time) 1151 { 1152 struct ceph_mds_session *old_lease_session = NULL; 1153 spin_lock(&dentry->d_lock); 1154 __update_dentry_lease(dir, dentry, lease, session, from_time, 1155 &old_lease_session); 1156 spin_unlock(&dentry->d_lock); 1157 if (old_lease_session) 1158 ceph_put_mds_session(old_lease_session); 1159 } 1160 1161 /* 1162 * update dentry lease without having parent inode locked 1163 */ 1164 static void update_dentry_lease_careful(struct dentry *dentry, 1165 struct ceph_mds_reply_lease *lease, 1166 struct ceph_mds_session *session, 1167 unsigned long from_time, 1168 char *dname, u32 dname_len, 1169 struct ceph_vino *pdvino, 1170 struct ceph_vino *ptvino) 1171 1172 { 1173 struct inode *dir; 1174 struct ceph_mds_session *old_lease_session = NULL; 1175 1176 spin_lock(&dentry->d_lock); 1177 /* make sure dentry's name matches target */ 1178 if (dentry->d_name.len != dname_len || 1179 memcmp(dentry->d_name.name, dname, dname_len)) 1180 goto out_unlock; 1181 1182 dir = d_inode(dentry->d_parent); 1183 /* make sure parent matches dvino */ 1184 if (!ceph_ino_compare(dir, pdvino)) 1185 goto out_unlock; 1186 1187 /* make sure dentry's inode matches target. NULL ptvino means that 1188 * we expect a negative dentry */ 1189 if (ptvino) { 1190 if (d_really_is_negative(dentry)) 1191 goto out_unlock; 1192 if (!ceph_ino_compare(d_inode(dentry), ptvino)) 1193 goto out_unlock; 1194 } else { 1195 if (d_really_is_positive(dentry)) 1196 goto out_unlock; 1197 } 1198 1199 __update_dentry_lease(dir, dentry, lease, session, 1200 from_time, &old_lease_session); 1201 out_unlock: 1202 spin_unlock(&dentry->d_lock); 1203 if (old_lease_session) 1204 ceph_put_mds_session(old_lease_session); 1205 } 1206 1207 /* 1208 * splice a dentry to an inode. 1209 * caller must hold directory i_mutex for this to be safe. 1210 */ 1211 static int splice_dentry(struct dentry **pdn, struct inode *in) 1212 { 1213 struct dentry *dn = *pdn; 1214 struct dentry *realdn; 1215 1216 BUG_ON(d_inode(dn)); 1217 1218 if (S_ISDIR(in->i_mode)) { 1219 /* If inode is directory, d_splice_alias() below will remove 1220 * 'realdn' from its origin parent. We need to ensure that 1221 * origin parent's readdir cache will not reference 'realdn' 1222 */ 1223 realdn = d_find_any_alias(in); 1224 if (realdn) { 1225 struct ceph_dentry_info *di = ceph_dentry(realdn); 1226 spin_lock(&realdn->d_lock); 1227 1228 realdn->d_op->d_prune(realdn); 1229 1230 di->time = jiffies; 1231 di->lease_shared_gen = 0; 1232 di->offset = 0; 1233 1234 spin_unlock(&realdn->d_lock); 1235 dput(realdn); 1236 } 1237 } 1238 1239 /* dn must be unhashed */ 1240 if (!d_unhashed(dn)) 1241 d_drop(dn); 1242 realdn = d_splice_alias(in, dn); 1243 if (IS_ERR(realdn)) { 1244 pr_err("splice_dentry error %ld %p inode %p ino %llx.%llx\n", 1245 PTR_ERR(realdn), dn, in, ceph_vinop(in)); 1246 return PTR_ERR(realdn); 1247 } 1248 1249 if (realdn) { 1250 dout("dn %p (%d) spliced with %p (%d) " 1251 "inode %p ino %llx.%llx\n", 1252 dn, d_count(dn), 1253 realdn, d_count(realdn), 1254 d_inode(realdn), ceph_vinop(d_inode(realdn))); 1255 dput(dn); 1256 *pdn = realdn; 1257 } else { 1258 BUG_ON(!ceph_dentry(dn)); 1259 dout("dn %p attached to %p ino %llx.%llx\n", 1260 dn, d_inode(dn), ceph_vinop(d_inode(dn))); 1261 } 1262 return 0; 1263 } 1264 1265 /* 1266 * Incorporate results into the local cache. This is either just 1267 * one inode, or a directory, dentry, and possibly linked-to inode (e.g., 1268 * after a lookup). 1269 * 1270 * A reply may contain 1271 * a directory inode along with a dentry. 1272 * and/or a target inode 1273 * 1274 * Called with snap_rwsem (read). 1275 */ 1276 int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req) 1277 { 1278 struct ceph_mds_session *session = req->r_session; 1279 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info; 1280 struct inode *in = NULL; 1281 struct ceph_vino tvino, dvino; 1282 struct ceph_fs_client *fsc = ceph_sb_to_client(sb); 1283 int err = 0; 1284 1285 dout("fill_trace %p is_dentry %d is_target %d\n", req, 1286 rinfo->head->is_dentry, rinfo->head->is_target); 1287 1288 if (!rinfo->head->is_target && !rinfo->head->is_dentry) { 1289 dout("fill_trace reply is empty!\n"); 1290 if (rinfo->head->result == 0 && req->r_parent) 1291 ceph_invalidate_dir_request(req); 1292 return 0; 1293 } 1294 1295 if (rinfo->head->is_dentry) { 1296 struct inode *dir = req->r_parent; 1297 1298 if (dir) { 1299 err = ceph_fill_inode(dir, NULL, &rinfo->diri, 1300 rinfo->dirfrag, session, -1, 1301 &req->r_caps_reservation); 1302 if (err < 0) 1303 goto done; 1304 } else { 1305 WARN_ON_ONCE(1); 1306 } 1307 1308 if (dir && req->r_op == CEPH_MDS_OP_LOOKUPNAME && 1309 test_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags) && 1310 !test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) { 1311 struct qstr dname; 1312 struct dentry *dn, *parent; 1313 1314 BUG_ON(!rinfo->head->is_target); 1315 BUG_ON(req->r_dentry); 1316 1317 parent = d_find_any_alias(dir); 1318 BUG_ON(!parent); 1319 1320 dname.name = rinfo->dname; 1321 dname.len = rinfo->dname_len; 1322 dname.hash = full_name_hash(parent, dname.name, dname.len); 1323 tvino.ino = le64_to_cpu(rinfo->targeti.in->ino); 1324 tvino.snap = le64_to_cpu(rinfo->targeti.in->snapid); 1325 retry_lookup: 1326 dn = d_lookup(parent, &dname); 1327 dout("d_lookup on parent=%p name=%.*s got %p\n", 1328 parent, dname.len, dname.name, dn); 1329 1330 if (!dn) { 1331 dn = d_alloc(parent, &dname); 1332 dout("d_alloc %p '%.*s' = %p\n", parent, 1333 dname.len, dname.name, dn); 1334 if (!dn) { 1335 dput(parent); 1336 err = -ENOMEM; 1337 goto done; 1338 } 1339 err = 0; 1340 } else if (d_really_is_positive(dn) && 1341 (ceph_ino(d_inode(dn)) != tvino.ino || 1342 ceph_snap(d_inode(dn)) != tvino.snap)) { 1343 dout(" dn %p points to wrong inode %p\n", 1344 dn, d_inode(dn)); 1345 ceph_dir_clear_ordered(dir); 1346 d_delete(dn); 1347 dput(dn); 1348 goto retry_lookup; 1349 } 1350 1351 req->r_dentry = dn; 1352 dput(parent); 1353 } 1354 } 1355 1356 if (rinfo->head->is_target) { 1357 /* Should be filled in by handle_reply */ 1358 BUG_ON(!req->r_target_inode); 1359 1360 in = req->r_target_inode; 1361 err = ceph_fill_inode(in, req->r_locked_page, &rinfo->targeti, 1362 NULL, session, 1363 (!test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags) && 1364 !test_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags) && 1365 rinfo->head->result == 0) ? req->r_fmode : -1, 1366 &req->r_caps_reservation); 1367 if (err < 0) { 1368 pr_err("ceph_fill_inode badness %p %llx.%llx\n", 1369 in, ceph_vinop(in)); 1370 req->r_target_inode = NULL; 1371 if (in->i_state & I_NEW) 1372 discard_new_inode(in); 1373 else 1374 iput(in); 1375 goto done; 1376 } 1377 if (in->i_state & I_NEW) 1378 unlock_new_inode(in); 1379 } 1380 1381 /* 1382 * ignore null lease/binding on snapdir ENOENT, or else we 1383 * will have trouble splicing in the virtual snapdir later 1384 */ 1385 if (rinfo->head->is_dentry && 1386 !test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags) && 1387 test_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags) && 1388 (rinfo->head->is_target || strncmp(req->r_dentry->d_name.name, 1389 fsc->mount_options->snapdir_name, 1390 req->r_dentry->d_name.len))) { 1391 /* 1392 * lookup link rename : null -> possibly existing inode 1393 * mknod symlink mkdir : null -> new inode 1394 * unlink : linked -> null 1395 */ 1396 struct inode *dir = req->r_parent; 1397 struct dentry *dn = req->r_dentry; 1398 bool have_dir_cap, have_lease; 1399 1400 BUG_ON(!dn); 1401 BUG_ON(!dir); 1402 BUG_ON(d_inode(dn->d_parent) != dir); 1403 1404 dvino.ino = le64_to_cpu(rinfo->diri.in->ino); 1405 dvino.snap = le64_to_cpu(rinfo->diri.in->snapid); 1406 1407 BUG_ON(ceph_ino(dir) != dvino.ino); 1408 BUG_ON(ceph_snap(dir) != dvino.snap); 1409 1410 /* do we have a lease on the whole dir? */ 1411 have_dir_cap = 1412 (le32_to_cpu(rinfo->diri.in->cap.caps) & 1413 CEPH_CAP_FILE_SHARED); 1414 1415 /* do we have a dn lease? */ 1416 have_lease = have_dir_cap || 1417 le32_to_cpu(rinfo->dlease->duration_ms); 1418 if (!have_lease) 1419 dout("fill_trace no dentry lease or dir cap\n"); 1420 1421 /* rename? */ 1422 if (req->r_old_dentry && req->r_op == CEPH_MDS_OP_RENAME) { 1423 struct inode *olddir = req->r_old_dentry_dir; 1424 BUG_ON(!olddir); 1425 1426 dout(" src %p '%pd' dst %p '%pd'\n", 1427 req->r_old_dentry, 1428 req->r_old_dentry, 1429 dn, dn); 1430 dout("fill_trace doing d_move %p -> %p\n", 1431 req->r_old_dentry, dn); 1432 1433 /* d_move screws up sibling dentries' offsets */ 1434 ceph_dir_clear_ordered(dir); 1435 ceph_dir_clear_ordered(olddir); 1436 1437 d_move(req->r_old_dentry, dn); 1438 dout(" src %p '%pd' dst %p '%pd'\n", 1439 req->r_old_dentry, 1440 req->r_old_dentry, 1441 dn, dn); 1442 1443 /* ensure target dentry is invalidated, despite 1444 rehashing bug in vfs_rename_dir */ 1445 ceph_invalidate_dentry_lease(dn); 1446 1447 dout("dn %p gets new offset %lld\n", req->r_old_dentry, 1448 ceph_dentry(req->r_old_dentry)->offset); 1449 1450 /* swap r_dentry and r_old_dentry in case that 1451 * splice_dentry() gets called later. This is safe 1452 * because no other place will use them */ 1453 req->r_dentry = req->r_old_dentry; 1454 req->r_old_dentry = dn; 1455 dn = req->r_dentry; 1456 } 1457 1458 /* null dentry? */ 1459 if (!rinfo->head->is_target) { 1460 dout("fill_trace null dentry\n"); 1461 if (d_really_is_positive(dn)) { 1462 dout("d_delete %p\n", dn); 1463 ceph_dir_clear_ordered(dir); 1464 d_delete(dn); 1465 } else if (have_lease) { 1466 if (d_unhashed(dn)) 1467 d_add(dn, NULL); 1468 update_dentry_lease(dir, dn, 1469 rinfo->dlease, session, 1470 req->r_request_started); 1471 } 1472 goto done; 1473 } 1474 1475 /* attach proper inode */ 1476 if (d_really_is_negative(dn)) { 1477 ceph_dir_clear_ordered(dir); 1478 ihold(in); 1479 err = splice_dentry(&req->r_dentry, in); 1480 if (err < 0) 1481 goto done; 1482 dn = req->r_dentry; /* may have spliced */ 1483 } else if (d_really_is_positive(dn) && d_inode(dn) != in) { 1484 dout(" %p links to %p %llx.%llx, not %llx.%llx\n", 1485 dn, d_inode(dn), ceph_vinop(d_inode(dn)), 1486 ceph_vinop(in)); 1487 d_invalidate(dn); 1488 have_lease = false; 1489 } 1490 1491 if (have_lease) { 1492 update_dentry_lease(dir, dn, 1493 rinfo->dlease, session, 1494 req->r_request_started); 1495 } 1496 dout(" final dn %p\n", dn); 1497 } else if ((req->r_op == CEPH_MDS_OP_LOOKUPSNAP || 1498 req->r_op == CEPH_MDS_OP_MKSNAP) && 1499 test_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags) && 1500 !test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) { 1501 struct inode *dir = req->r_parent; 1502 1503 /* fill out a snapdir LOOKUPSNAP dentry */ 1504 BUG_ON(!dir); 1505 BUG_ON(ceph_snap(dir) != CEPH_SNAPDIR); 1506 BUG_ON(!req->r_dentry); 1507 dout(" linking snapped dir %p to dn %p\n", in, req->r_dentry); 1508 ceph_dir_clear_ordered(dir); 1509 ihold(in); 1510 err = splice_dentry(&req->r_dentry, in); 1511 if (err < 0) 1512 goto done; 1513 } else if (rinfo->head->is_dentry && req->r_dentry) { 1514 /* parent inode is not locked, be carefull */ 1515 struct ceph_vino *ptvino = NULL; 1516 dvino.ino = le64_to_cpu(rinfo->diri.in->ino); 1517 dvino.snap = le64_to_cpu(rinfo->diri.in->snapid); 1518 if (rinfo->head->is_target) { 1519 tvino.ino = le64_to_cpu(rinfo->targeti.in->ino); 1520 tvino.snap = le64_to_cpu(rinfo->targeti.in->snapid); 1521 ptvino = &tvino; 1522 } 1523 update_dentry_lease_careful(req->r_dentry, rinfo->dlease, 1524 session, req->r_request_started, 1525 rinfo->dname, rinfo->dname_len, 1526 &dvino, ptvino); 1527 } 1528 done: 1529 dout("fill_trace done err=%d\n", err); 1530 return err; 1531 } 1532 1533 /* 1534 * Prepopulate our cache with readdir results, leases, etc. 1535 */ 1536 static int readdir_prepopulate_inodes_only(struct ceph_mds_request *req, 1537 struct ceph_mds_session *session) 1538 { 1539 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info; 1540 int i, err = 0; 1541 1542 for (i = 0; i < rinfo->dir_nr; i++) { 1543 struct ceph_mds_reply_dir_entry *rde = rinfo->dir_entries + i; 1544 struct ceph_vino vino; 1545 struct inode *in; 1546 int rc; 1547 1548 vino.ino = le64_to_cpu(rde->inode.in->ino); 1549 vino.snap = le64_to_cpu(rde->inode.in->snapid); 1550 1551 in = ceph_get_inode(req->r_dentry->d_sb, vino); 1552 if (IS_ERR(in)) { 1553 err = PTR_ERR(in); 1554 dout("new_inode badness got %d\n", err); 1555 continue; 1556 } 1557 rc = ceph_fill_inode(in, NULL, &rde->inode, NULL, session, 1558 -1, &req->r_caps_reservation); 1559 if (rc < 0) { 1560 pr_err("ceph_fill_inode badness on %p got %d\n", 1561 in, rc); 1562 err = rc; 1563 if (in->i_state & I_NEW) { 1564 ihold(in); 1565 discard_new_inode(in); 1566 } 1567 } else if (in->i_state & I_NEW) { 1568 unlock_new_inode(in); 1569 } 1570 1571 /* avoid calling iput_final() in mds dispatch threads */ 1572 ceph_async_iput(in); 1573 } 1574 1575 return err; 1576 } 1577 1578 void ceph_readdir_cache_release(struct ceph_readdir_cache_control *ctl) 1579 { 1580 if (ctl->page) { 1581 kunmap(ctl->page); 1582 put_page(ctl->page); 1583 ctl->page = NULL; 1584 } 1585 } 1586 1587 static int fill_readdir_cache(struct inode *dir, struct dentry *dn, 1588 struct ceph_readdir_cache_control *ctl, 1589 struct ceph_mds_request *req) 1590 { 1591 struct ceph_inode_info *ci = ceph_inode(dir); 1592 unsigned nsize = PAGE_SIZE / sizeof(struct dentry*); 1593 unsigned idx = ctl->index % nsize; 1594 pgoff_t pgoff = ctl->index / nsize; 1595 1596 if (!ctl->page || pgoff != page_index(ctl->page)) { 1597 ceph_readdir_cache_release(ctl); 1598 if (idx == 0) 1599 ctl->page = grab_cache_page(&dir->i_data, pgoff); 1600 else 1601 ctl->page = find_lock_page(&dir->i_data, pgoff); 1602 if (!ctl->page) { 1603 ctl->index = -1; 1604 return idx == 0 ? -ENOMEM : 0; 1605 } 1606 /* reading/filling the cache are serialized by 1607 * i_mutex, no need to use page lock */ 1608 unlock_page(ctl->page); 1609 ctl->dentries = kmap(ctl->page); 1610 if (idx == 0) 1611 memset(ctl->dentries, 0, PAGE_SIZE); 1612 } 1613 1614 if (req->r_dir_release_cnt == atomic64_read(&ci->i_release_count) && 1615 req->r_dir_ordered_cnt == atomic64_read(&ci->i_ordered_count)) { 1616 dout("readdir cache dn %p idx %d\n", dn, ctl->index); 1617 ctl->dentries[idx] = dn; 1618 ctl->index++; 1619 } else { 1620 dout("disable readdir cache\n"); 1621 ctl->index = -1; 1622 } 1623 return 0; 1624 } 1625 1626 int ceph_readdir_prepopulate(struct ceph_mds_request *req, 1627 struct ceph_mds_session *session) 1628 { 1629 struct dentry *parent = req->r_dentry; 1630 struct ceph_inode_info *ci = ceph_inode(d_inode(parent)); 1631 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info; 1632 struct qstr dname; 1633 struct dentry *dn; 1634 struct inode *in; 1635 int err = 0, skipped = 0, ret, i; 1636 u32 frag = le32_to_cpu(req->r_args.readdir.frag); 1637 u32 last_hash = 0; 1638 u32 fpos_offset; 1639 struct ceph_readdir_cache_control cache_ctl = {}; 1640 1641 if (test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) 1642 return readdir_prepopulate_inodes_only(req, session); 1643 1644 if (rinfo->hash_order) { 1645 if (req->r_path2) { 1646 last_hash = ceph_str_hash(ci->i_dir_layout.dl_dir_hash, 1647 req->r_path2, 1648 strlen(req->r_path2)); 1649 last_hash = ceph_frag_value(last_hash); 1650 } else if (rinfo->offset_hash) { 1651 /* mds understands offset_hash */ 1652 WARN_ON_ONCE(req->r_readdir_offset != 2); 1653 last_hash = le32_to_cpu(req->r_args.readdir.offset_hash); 1654 } 1655 } 1656 1657 if (rinfo->dir_dir && 1658 le32_to_cpu(rinfo->dir_dir->frag) != frag) { 1659 dout("readdir_prepopulate got new frag %x -> %x\n", 1660 frag, le32_to_cpu(rinfo->dir_dir->frag)); 1661 frag = le32_to_cpu(rinfo->dir_dir->frag); 1662 if (!rinfo->hash_order) 1663 req->r_readdir_offset = 2; 1664 } 1665 1666 if (le32_to_cpu(rinfo->head->op) == CEPH_MDS_OP_LSSNAP) { 1667 dout("readdir_prepopulate %d items under SNAPDIR dn %p\n", 1668 rinfo->dir_nr, parent); 1669 } else { 1670 dout("readdir_prepopulate %d items under dn %p\n", 1671 rinfo->dir_nr, parent); 1672 if (rinfo->dir_dir) 1673 ceph_fill_dirfrag(d_inode(parent), rinfo->dir_dir); 1674 1675 if (ceph_frag_is_leftmost(frag) && 1676 req->r_readdir_offset == 2 && 1677 !(rinfo->hash_order && last_hash)) { 1678 /* note dir version at start of readdir so we can 1679 * tell if any dentries get dropped */ 1680 req->r_dir_release_cnt = 1681 atomic64_read(&ci->i_release_count); 1682 req->r_dir_ordered_cnt = 1683 atomic64_read(&ci->i_ordered_count); 1684 req->r_readdir_cache_idx = 0; 1685 } 1686 } 1687 1688 cache_ctl.index = req->r_readdir_cache_idx; 1689 fpos_offset = req->r_readdir_offset; 1690 1691 /* FIXME: release caps/leases if error occurs */ 1692 for (i = 0; i < rinfo->dir_nr; i++) { 1693 struct ceph_mds_reply_dir_entry *rde = rinfo->dir_entries + i; 1694 struct ceph_vino tvino; 1695 1696 dname.name = rde->name; 1697 dname.len = rde->name_len; 1698 dname.hash = full_name_hash(parent, dname.name, dname.len); 1699 1700 tvino.ino = le64_to_cpu(rde->inode.in->ino); 1701 tvino.snap = le64_to_cpu(rde->inode.in->snapid); 1702 1703 if (rinfo->hash_order) { 1704 u32 hash = ceph_str_hash(ci->i_dir_layout.dl_dir_hash, 1705 rde->name, rde->name_len); 1706 hash = ceph_frag_value(hash); 1707 if (hash != last_hash) 1708 fpos_offset = 2; 1709 last_hash = hash; 1710 rde->offset = ceph_make_fpos(hash, fpos_offset++, true); 1711 } else { 1712 rde->offset = ceph_make_fpos(frag, fpos_offset++, false); 1713 } 1714 1715 retry_lookup: 1716 dn = d_lookup(parent, &dname); 1717 dout("d_lookup on parent=%p name=%.*s got %p\n", 1718 parent, dname.len, dname.name, dn); 1719 1720 if (!dn) { 1721 dn = d_alloc(parent, &dname); 1722 dout("d_alloc %p '%.*s' = %p\n", parent, 1723 dname.len, dname.name, dn); 1724 if (!dn) { 1725 dout("d_alloc badness\n"); 1726 err = -ENOMEM; 1727 goto out; 1728 } 1729 } else if (d_really_is_positive(dn) && 1730 (ceph_ino(d_inode(dn)) != tvino.ino || 1731 ceph_snap(d_inode(dn)) != tvino.snap)) { 1732 struct ceph_dentry_info *di = ceph_dentry(dn); 1733 dout(" dn %p points to wrong inode %p\n", 1734 dn, d_inode(dn)); 1735 1736 spin_lock(&dn->d_lock); 1737 if (di->offset > 0 && 1738 di->lease_shared_gen == 1739 atomic_read(&ci->i_shared_gen)) { 1740 __ceph_dir_clear_ordered(ci); 1741 di->offset = 0; 1742 } 1743 spin_unlock(&dn->d_lock); 1744 1745 d_delete(dn); 1746 dput(dn); 1747 goto retry_lookup; 1748 } 1749 1750 /* inode */ 1751 if (d_really_is_positive(dn)) { 1752 in = d_inode(dn); 1753 } else { 1754 in = ceph_get_inode(parent->d_sb, tvino); 1755 if (IS_ERR(in)) { 1756 dout("new_inode badness\n"); 1757 d_drop(dn); 1758 dput(dn); 1759 err = PTR_ERR(in); 1760 goto out; 1761 } 1762 } 1763 1764 ret = ceph_fill_inode(in, NULL, &rde->inode, NULL, session, 1765 -1, &req->r_caps_reservation); 1766 if (ret < 0) { 1767 pr_err("ceph_fill_inode badness on %p\n", in); 1768 if (d_really_is_negative(dn)) { 1769 /* avoid calling iput_final() in mds 1770 * dispatch threads */ 1771 if (in->i_state & I_NEW) { 1772 ihold(in); 1773 discard_new_inode(in); 1774 } 1775 ceph_async_iput(in); 1776 } 1777 d_drop(dn); 1778 err = ret; 1779 goto next_item; 1780 } 1781 if (in->i_state & I_NEW) 1782 unlock_new_inode(in); 1783 1784 if (d_really_is_negative(dn)) { 1785 if (ceph_security_xattr_deadlock(in)) { 1786 dout(" skip splicing dn %p to inode %p" 1787 " (security xattr deadlock)\n", dn, in); 1788 ceph_async_iput(in); 1789 skipped++; 1790 goto next_item; 1791 } 1792 1793 err = splice_dentry(&dn, in); 1794 if (err < 0) 1795 goto next_item; 1796 } 1797 1798 ceph_dentry(dn)->offset = rde->offset; 1799 1800 update_dentry_lease(d_inode(parent), dn, 1801 rde->lease, req->r_session, 1802 req->r_request_started); 1803 1804 if (err == 0 && skipped == 0 && cache_ctl.index >= 0) { 1805 ret = fill_readdir_cache(d_inode(parent), dn, 1806 &cache_ctl, req); 1807 if (ret < 0) 1808 err = ret; 1809 } 1810 next_item: 1811 dput(dn); 1812 } 1813 out: 1814 if (err == 0 && skipped == 0) { 1815 set_bit(CEPH_MDS_R_DID_PREPOPULATE, &req->r_req_flags); 1816 req->r_readdir_cache_idx = cache_ctl.index; 1817 } 1818 ceph_readdir_cache_release(&cache_ctl); 1819 dout("readdir_prepopulate done\n"); 1820 return err; 1821 } 1822 1823 bool ceph_inode_set_size(struct inode *inode, loff_t size) 1824 { 1825 struct ceph_inode_info *ci = ceph_inode(inode); 1826 bool ret; 1827 1828 spin_lock(&ci->i_ceph_lock); 1829 dout("set_size %p %llu -> %llu\n", inode, i_size_read(inode), size); 1830 i_size_write(inode, size); 1831 inode->i_blocks = calc_inode_blocks(size); 1832 1833 ret = __ceph_should_report_size(ci); 1834 1835 spin_unlock(&ci->i_ceph_lock); 1836 return ret; 1837 } 1838 1839 /* 1840 * Put reference to inode, but avoid calling iput_final() in current thread. 1841 * iput_final() may wait for reahahead pages. The wait can cause deadlock in 1842 * some contexts. 1843 */ 1844 void ceph_async_iput(struct inode *inode) 1845 { 1846 if (!inode) 1847 return; 1848 for (;;) { 1849 if (atomic_add_unless(&inode->i_count, -1, 1)) 1850 break; 1851 if (queue_work(ceph_inode_to_client(inode)->inode_wq, 1852 &ceph_inode(inode)->i_work)) 1853 break; 1854 /* queue work failed, i_count must be at least 2 */ 1855 } 1856 } 1857 1858 void ceph_queue_inode_work(struct inode *inode, int work_bit) 1859 { 1860 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 1861 struct ceph_inode_info *ci = ceph_inode(inode); 1862 set_bit(work_bit, &ci->i_work_mask); 1863 1864 ihold(inode); 1865 if (queue_work(fsc->inode_wq, &ci->i_work)) { 1866 dout("queue_inode_work %p, mask=%lx\n", inode, ci->i_work_mask); 1867 } else { 1868 dout("queue_inode_work %p already queued, mask=%lx\n", 1869 inode, ci->i_work_mask); 1870 iput(inode); 1871 } 1872 } 1873 1874 static void ceph_do_invalidate_pages(struct inode *inode) 1875 { 1876 struct ceph_inode_info *ci = ceph_inode(inode); 1877 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 1878 u32 orig_gen; 1879 int check = 0; 1880 1881 mutex_lock(&ci->i_truncate_mutex); 1882 1883 if (READ_ONCE(fsc->mount_state) >= CEPH_MOUNT_SHUTDOWN) { 1884 pr_warn_ratelimited("invalidate_pages %p %lld forced umount\n", 1885 inode, ceph_ino(inode)); 1886 mapping_set_error(inode->i_mapping, -EIO); 1887 truncate_pagecache(inode, 0); 1888 mutex_unlock(&ci->i_truncate_mutex); 1889 goto out; 1890 } 1891 1892 spin_lock(&ci->i_ceph_lock); 1893 dout("invalidate_pages %p gen %d revoking %d\n", inode, 1894 ci->i_rdcache_gen, ci->i_rdcache_revoking); 1895 if (ci->i_rdcache_revoking != ci->i_rdcache_gen) { 1896 if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE)) 1897 check = 1; 1898 spin_unlock(&ci->i_ceph_lock); 1899 mutex_unlock(&ci->i_truncate_mutex); 1900 goto out; 1901 } 1902 orig_gen = ci->i_rdcache_gen; 1903 spin_unlock(&ci->i_ceph_lock); 1904 1905 ceph_fscache_invalidate(inode); 1906 if (invalidate_inode_pages2(inode->i_mapping) < 0) { 1907 pr_err("invalidate_pages %p fails\n", inode); 1908 } 1909 1910 spin_lock(&ci->i_ceph_lock); 1911 if (orig_gen == ci->i_rdcache_gen && 1912 orig_gen == ci->i_rdcache_revoking) { 1913 dout("invalidate_pages %p gen %d successful\n", inode, 1914 ci->i_rdcache_gen); 1915 ci->i_rdcache_revoking--; 1916 check = 1; 1917 } else { 1918 dout("invalidate_pages %p gen %d raced, now %d revoking %d\n", 1919 inode, orig_gen, ci->i_rdcache_gen, 1920 ci->i_rdcache_revoking); 1921 if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE)) 1922 check = 1; 1923 } 1924 spin_unlock(&ci->i_ceph_lock); 1925 mutex_unlock(&ci->i_truncate_mutex); 1926 out: 1927 if (check) 1928 ceph_check_caps(ci, 0, NULL); 1929 } 1930 1931 /* 1932 * Make sure any pending truncation is applied before doing anything 1933 * that may depend on it. 1934 */ 1935 void __ceph_do_pending_vmtruncate(struct inode *inode) 1936 { 1937 struct ceph_inode_info *ci = ceph_inode(inode); 1938 u64 to; 1939 int wrbuffer_refs, finish = 0; 1940 1941 mutex_lock(&ci->i_truncate_mutex); 1942 retry: 1943 spin_lock(&ci->i_ceph_lock); 1944 if (ci->i_truncate_pending == 0) { 1945 dout("__do_pending_vmtruncate %p none pending\n", inode); 1946 spin_unlock(&ci->i_ceph_lock); 1947 mutex_unlock(&ci->i_truncate_mutex); 1948 return; 1949 } 1950 1951 /* 1952 * make sure any dirty snapped pages are flushed before we 1953 * possibly truncate them.. so write AND block! 1954 */ 1955 if (ci->i_wrbuffer_ref_head < ci->i_wrbuffer_ref) { 1956 spin_unlock(&ci->i_ceph_lock); 1957 dout("__do_pending_vmtruncate %p flushing snaps first\n", 1958 inode); 1959 filemap_write_and_wait_range(&inode->i_data, 0, 1960 inode->i_sb->s_maxbytes); 1961 goto retry; 1962 } 1963 1964 /* there should be no reader or writer */ 1965 WARN_ON_ONCE(ci->i_rd_ref || ci->i_wr_ref); 1966 1967 to = ci->i_truncate_size; 1968 wrbuffer_refs = ci->i_wrbuffer_ref; 1969 dout("__do_pending_vmtruncate %p (%d) to %lld\n", inode, 1970 ci->i_truncate_pending, to); 1971 spin_unlock(&ci->i_ceph_lock); 1972 1973 truncate_pagecache(inode, to); 1974 1975 spin_lock(&ci->i_ceph_lock); 1976 if (to == ci->i_truncate_size) { 1977 ci->i_truncate_pending = 0; 1978 finish = 1; 1979 } 1980 spin_unlock(&ci->i_ceph_lock); 1981 if (!finish) 1982 goto retry; 1983 1984 mutex_unlock(&ci->i_truncate_mutex); 1985 1986 if (wrbuffer_refs == 0) 1987 ceph_check_caps(ci, 0, NULL); 1988 1989 wake_up_all(&ci->i_cap_wq); 1990 } 1991 1992 static void ceph_inode_work(struct work_struct *work) 1993 { 1994 struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info, 1995 i_work); 1996 struct inode *inode = &ci->vfs_inode; 1997 1998 if (test_and_clear_bit(CEPH_I_WORK_WRITEBACK, &ci->i_work_mask)) { 1999 dout("writeback %p\n", inode); 2000 filemap_fdatawrite(&inode->i_data); 2001 } 2002 if (test_and_clear_bit(CEPH_I_WORK_INVALIDATE_PAGES, &ci->i_work_mask)) 2003 ceph_do_invalidate_pages(inode); 2004 2005 if (test_and_clear_bit(CEPH_I_WORK_VMTRUNCATE, &ci->i_work_mask)) 2006 __ceph_do_pending_vmtruncate(inode); 2007 2008 if (test_and_clear_bit(CEPH_I_WORK_CHECK_CAPS, &ci->i_work_mask)) 2009 ceph_check_caps(ci, 0, NULL); 2010 2011 if (test_and_clear_bit(CEPH_I_WORK_FLUSH_SNAPS, &ci->i_work_mask)) 2012 ceph_flush_snaps(ci, NULL); 2013 2014 iput(inode); 2015 } 2016 2017 /* 2018 * symlinks 2019 */ 2020 static const struct inode_operations ceph_symlink_iops = { 2021 .get_link = simple_get_link, 2022 .setattr = ceph_setattr, 2023 .getattr = ceph_getattr, 2024 .listxattr = ceph_listxattr, 2025 }; 2026 2027 int __ceph_setattr(struct inode *inode, struct iattr *attr) 2028 { 2029 struct ceph_inode_info *ci = ceph_inode(inode); 2030 unsigned int ia_valid = attr->ia_valid; 2031 struct ceph_mds_request *req; 2032 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc; 2033 struct ceph_cap_flush *prealloc_cf; 2034 int issued; 2035 int release = 0, dirtied = 0; 2036 int mask = 0; 2037 int err = 0; 2038 int inode_dirty_flags = 0; 2039 bool lock_snap_rwsem = false; 2040 2041 prealloc_cf = ceph_alloc_cap_flush(); 2042 if (!prealloc_cf) 2043 return -ENOMEM; 2044 2045 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETATTR, 2046 USE_AUTH_MDS); 2047 if (IS_ERR(req)) { 2048 ceph_free_cap_flush(prealloc_cf); 2049 return PTR_ERR(req); 2050 } 2051 2052 spin_lock(&ci->i_ceph_lock); 2053 issued = __ceph_caps_issued(ci, NULL); 2054 2055 if (!ci->i_head_snapc && 2056 (issued & (CEPH_CAP_ANY_EXCL | CEPH_CAP_FILE_WR))) { 2057 lock_snap_rwsem = true; 2058 if (!down_read_trylock(&mdsc->snap_rwsem)) { 2059 spin_unlock(&ci->i_ceph_lock); 2060 down_read(&mdsc->snap_rwsem); 2061 spin_lock(&ci->i_ceph_lock); 2062 issued = __ceph_caps_issued(ci, NULL); 2063 } 2064 } 2065 2066 dout("setattr %p issued %s\n", inode, ceph_cap_string(issued)); 2067 2068 if (ia_valid & ATTR_UID) { 2069 dout("setattr %p uid %d -> %d\n", inode, 2070 from_kuid(&init_user_ns, inode->i_uid), 2071 from_kuid(&init_user_ns, attr->ia_uid)); 2072 if (issued & CEPH_CAP_AUTH_EXCL) { 2073 inode->i_uid = attr->ia_uid; 2074 dirtied |= CEPH_CAP_AUTH_EXCL; 2075 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 || 2076 !uid_eq(attr->ia_uid, inode->i_uid)) { 2077 req->r_args.setattr.uid = cpu_to_le32( 2078 from_kuid(&init_user_ns, attr->ia_uid)); 2079 mask |= CEPH_SETATTR_UID; 2080 release |= CEPH_CAP_AUTH_SHARED; 2081 } 2082 } 2083 if (ia_valid & ATTR_GID) { 2084 dout("setattr %p gid %d -> %d\n", inode, 2085 from_kgid(&init_user_ns, inode->i_gid), 2086 from_kgid(&init_user_ns, attr->ia_gid)); 2087 if (issued & CEPH_CAP_AUTH_EXCL) { 2088 inode->i_gid = attr->ia_gid; 2089 dirtied |= CEPH_CAP_AUTH_EXCL; 2090 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 || 2091 !gid_eq(attr->ia_gid, inode->i_gid)) { 2092 req->r_args.setattr.gid = cpu_to_le32( 2093 from_kgid(&init_user_ns, attr->ia_gid)); 2094 mask |= CEPH_SETATTR_GID; 2095 release |= CEPH_CAP_AUTH_SHARED; 2096 } 2097 } 2098 if (ia_valid & ATTR_MODE) { 2099 dout("setattr %p mode 0%o -> 0%o\n", inode, inode->i_mode, 2100 attr->ia_mode); 2101 if (issued & CEPH_CAP_AUTH_EXCL) { 2102 inode->i_mode = attr->ia_mode; 2103 dirtied |= CEPH_CAP_AUTH_EXCL; 2104 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 || 2105 attr->ia_mode != inode->i_mode) { 2106 inode->i_mode = attr->ia_mode; 2107 req->r_args.setattr.mode = cpu_to_le32(attr->ia_mode); 2108 mask |= CEPH_SETATTR_MODE; 2109 release |= CEPH_CAP_AUTH_SHARED; 2110 } 2111 } 2112 2113 if (ia_valid & ATTR_ATIME) { 2114 dout("setattr %p atime %lld.%ld -> %lld.%ld\n", inode, 2115 inode->i_atime.tv_sec, inode->i_atime.tv_nsec, 2116 attr->ia_atime.tv_sec, attr->ia_atime.tv_nsec); 2117 if (issued & CEPH_CAP_FILE_EXCL) { 2118 ci->i_time_warp_seq++; 2119 inode->i_atime = attr->ia_atime; 2120 dirtied |= CEPH_CAP_FILE_EXCL; 2121 } else if ((issued & CEPH_CAP_FILE_WR) && 2122 timespec64_compare(&inode->i_atime, 2123 &attr->ia_atime) < 0) { 2124 inode->i_atime = attr->ia_atime; 2125 dirtied |= CEPH_CAP_FILE_WR; 2126 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 || 2127 !timespec64_equal(&inode->i_atime, &attr->ia_atime)) { 2128 ceph_encode_timespec64(&req->r_args.setattr.atime, 2129 &attr->ia_atime); 2130 mask |= CEPH_SETATTR_ATIME; 2131 release |= CEPH_CAP_FILE_SHARED | 2132 CEPH_CAP_FILE_RD | CEPH_CAP_FILE_WR; 2133 } 2134 } 2135 if (ia_valid & ATTR_SIZE) { 2136 loff_t isize = i_size_read(inode); 2137 2138 dout("setattr %p size %lld -> %lld\n", inode, isize, attr->ia_size); 2139 if ((issued & CEPH_CAP_FILE_EXCL) && attr->ia_size > isize) { 2140 i_size_write(inode, attr->ia_size); 2141 inode->i_blocks = calc_inode_blocks(attr->ia_size); 2142 ci->i_reported_size = attr->ia_size; 2143 dirtied |= CEPH_CAP_FILE_EXCL; 2144 ia_valid |= ATTR_MTIME; 2145 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 || 2146 attr->ia_size != isize) { 2147 req->r_args.setattr.size = cpu_to_le64(attr->ia_size); 2148 req->r_args.setattr.old_size = cpu_to_le64(isize); 2149 mask |= CEPH_SETATTR_SIZE; 2150 release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_EXCL | 2151 CEPH_CAP_FILE_RD | CEPH_CAP_FILE_WR; 2152 } 2153 } 2154 if (ia_valid & ATTR_MTIME) { 2155 dout("setattr %p mtime %lld.%ld -> %lld.%ld\n", inode, 2156 inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec, 2157 attr->ia_mtime.tv_sec, attr->ia_mtime.tv_nsec); 2158 if (issued & CEPH_CAP_FILE_EXCL) { 2159 ci->i_time_warp_seq++; 2160 inode->i_mtime = attr->ia_mtime; 2161 dirtied |= CEPH_CAP_FILE_EXCL; 2162 } else if ((issued & CEPH_CAP_FILE_WR) && 2163 timespec64_compare(&inode->i_mtime, 2164 &attr->ia_mtime) < 0) { 2165 inode->i_mtime = attr->ia_mtime; 2166 dirtied |= CEPH_CAP_FILE_WR; 2167 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 || 2168 !timespec64_equal(&inode->i_mtime, &attr->ia_mtime)) { 2169 ceph_encode_timespec64(&req->r_args.setattr.mtime, 2170 &attr->ia_mtime); 2171 mask |= CEPH_SETATTR_MTIME; 2172 release |= CEPH_CAP_FILE_SHARED | 2173 CEPH_CAP_FILE_RD | CEPH_CAP_FILE_WR; 2174 } 2175 } 2176 2177 /* these do nothing */ 2178 if (ia_valid & ATTR_CTIME) { 2179 bool only = (ia_valid & (ATTR_SIZE|ATTR_MTIME|ATTR_ATIME| 2180 ATTR_MODE|ATTR_UID|ATTR_GID)) == 0; 2181 dout("setattr %p ctime %lld.%ld -> %lld.%ld (%s)\n", inode, 2182 inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec, 2183 attr->ia_ctime.tv_sec, attr->ia_ctime.tv_nsec, 2184 only ? "ctime only" : "ignored"); 2185 if (only) { 2186 /* 2187 * if kernel wants to dirty ctime but nothing else, 2188 * we need to choose a cap to dirty under, or do 2189 * a almost-no-op setattr 2190 */ 2191 if (issued & CEPH_CAP_AUTH_EXCL) 2192 dirtied |= CEPH_CAP_AUTH_EXCL; 2193 else if (issued & CEPH_CAP_FILE_EXCL) 2194 dirtied |= CEPH_CAP_FILE_EXCL; 2195 else if (issued & CEPH_CAP_XATTR_EXCL) 2196 dirtied |= CEPH_CAP_XATTR_EXCL; 2197 else 2198 mask |= CEPH_SETATTR_CTIME; 2199 } 2200 } 2201 if (ia_valid & ATTR_FILE) 2202 dout("setattr %p ATTR_FILE ... hrm!\n", inode); 2203 2204 if (dirtied) { 2205 inode_dirty_flags = __ceph_mark_dirty_caps(ci, dirtied, 2206 &prealloc_cf); 2207 inode->i_ctime = attr->ia_ctime; 2208 } 2209 2210 release &= issued; 2211 spin_unlock(&ci->i_ceph_lock); 2212 if (lock_snap_rwsem) 2213 up_read(&mdsc->snap_rwsem); 2214 2215 if (inode_dirty_flags) 2216 __mark_inode_dirty(inode, inode_dirty_flags); 2217 2218 2219 if (mask) { 2220 req->r_inode = inode; 2221 ihold(inode); 2222 req->r_inode_drop = release; 2223 req->r_args.setattr.mask = cpu_to_le32(mask); 2224 req->r_num_caps = 1; 2225 req->r_stamp = attr->ia_ctime; 2226 err = ceph_mdsc_do_request(mdsc, NULL, req); 2227 } 2228 dout("setattr %p result=%d (%s locally, %d remote)\n", inode, err, 2229 ceph_cap_string(dirtied), mask); 2230 2231 ceph_mdsc_put_request(req); 2232 ceph_free_cap_flush(prealloc_cf); 2233 2234 if (err >= 0 && (mask & CEPH_SETATTR_SIZE)) 2235 __ceph_do_pending_vmtruncate(inode); 2236 2237 return err; 2238 } 2239 2240 /* 2241 * setattr 2242 */ 2243 int ceph_setattr(struct user_namespace *mnt_userns, struct dentry *dentry, 2244 struct iattr *attr) 2245 { 2246 struct inode *inode = d_inode(dentry); 2247 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 2248 int err; 2249 2250 if (ceph_snap(inode) != CEPH_NOSNAP) 2251 return -EROFS; 2252 2253 err = setattr_prepare(&init_user_ns, dentry, attr); 2254 if (err != 0) 2255 return err; 2256 2257 if ((attr->ia_valid & ATTR_SIZE) && 2258 attr->ia_size > max(i_size_read(inode), fsc->max_file_size)) 2259 return -EFBIG; 2260 2261 if ((attr->ia_valid & ATTR_SIZE) && 2262 ceph_quota_is_max_bytes_exceeded(inode, attr->ia_size)) 2263 return -EDQUOT; 2264 2265 err = __ceph_setattr(inode, attr); 2266 2267 if (err >= 0 && (attr->ia_valid & ATTR_MODE)) 2268 err = posix_acl_chmod(&init_user_ns, inode, attr->ia_mode); 2269 2270 return err; 2271 } 2272 2273 /* 2274 * Verify that we have a lease on the given mask. If not, 2275 * do a getattr against an mds. 2276 */ 2277 int __ceph_do_getattr(struct inode *inode, struct page *locked_page, 2278 int mask, bool force) 2279 { 2280 struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb); 2281 struct ceph_mds_client *mdsc = fsc->mdsc; 2282 struct ceph_mds_request *req; 2283 int mode; 2284 int err; 2285 2286 if (ceph_snap(inode) == CEPH_SNAPDIR) { 2287 dout("do_getattr inode %p SNAPDIR\n", inode); 2288 return 0; 2289 } 2290 2291 dout("do_getattr inode %p mask %s mode 0%o\n", 2292 inode, ceph_cap_string(mask), inode->i_mode); 2293 if (!force && ceph_caps_issued_mask_metric(ceph_inode(inode), mask, 1)) 2294 return 0; 2295 2296 mode = (mask & CEPH_STAT_RSTAT) ? USE_AUTH_MDS : USE_ANY_MDS; 2297 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, mode); 2298 if (IS_ERR(req)) 2299 return PTR_ERR(req); 2300 req->r_inode = inode; 2301 ihold(inode); 2302 req->r_num_caps = 1; 2303 req->r_args.getattr.mask = cpu_to_le32(mask); 2304 req->r_locked_page = locked_page; 2305 err = ceph_mdsc_do_request(mdsc, NULL, req); 2306 if (locked_page && err == 0) { 2307 u64 inline_version = req->r_reply_info.targeti.inline_version; 2308 if (inline_version == 0) { 2309 /* the reply is supposed to contain inline data */ 2310 err = -EINVAL; 2311 } else if (inline_version == CEPH_INLINE_NONE) { 2312 err = -ENODATA; 2313 } else { 2314 err = req->r_reply_info.targeti.inline_len; 2315 } 2316 } 2317 ceph_mdsc_put_request(req); 2318 dout("do_getattr result=%d\n", err); 2319 return err; 2320 } 2321 2322 2323 /* 2324 * Check inode permissions. We verify we have a valid value for 2325 * the AUTH cap, then call the generic handler. 2326 */ 2327 int ceph_permission(struct user_namespace *mnt_userns, struct inode *inode, 2328 int mask) 2329 { 2330 int err; 2331 2332 if (mask & MAY_NOT_BLOCK) 2333 return -ECHILD; 2334 2335 err = ceph_do_getattr(inode, CEPH_CAP_AUTH_SHARED, false); 2336 2337 if (!err) 2338 err = generic_permission(&init_user_ns, inode, mask); 2339 return err; 2340 } 2341 2342 /* Craft a mask of needed caps given a set of requested statx attrs. */ 2343 static int statx_to_caps(u32 want, umode_t mode) 2344 { 2345 int mask = 0; 2346 2347 if (want & (STATX_MODE|STATX_UID|STATX_GID|STATX_CTIME|STATX_BTIME)) 2348 mask |= CEPH_CAP_AUTH_SHARED; 2349 2350 if (want & (STATX_NLINK|STATX_CTIME)) { 2351 /* 2352 * The link count for directories depends on inode->i_subdirs, 2353 * and that is only updated when Fs caps are held. 2354 */ 2355 if (S_ISDIR(mode)) 2356 mask |= CEPH_CAP_FILE_SHARED; 2357 else 2358 mask |= CEPH_CAP_LINK_SHARED; 2359 } 2360 2361 if (want & (STATX_ATIME|STATX_MTIME|STATX_CTIME|STATX_SIZE| 2362 STATX_BLOCKS)) 2363 mask |= CEPH_CAP_FILE_SHARED; 2364 2365 if (want & (STATX_CTIME)) 2366 mask |= CEPH_CAP_XATTR_SHARED; 2367 2368 return mask; 2369 } 2370 2371 /* 2372 * Get all the attributes. If we have sufficient caps for the requested attrs, 2373 * then we can avoid talking to the MDS at all. 2374 */ 2375 int ceph_getattr(struct user_namespace *mnt_userns, const struct path *path, 2376 struct kstat *stat, u32 request_mask, unsigned int flags) 2377 { 2378 struct inode *inode = d_inode(path->dentry); 2379 struct ceph_inode_info *ci = ceph_inode(inode); 2380 u32 valid_mask = STATX_BASIC_STATS; 2381 int err = 0; 2382 2383 /* Skip the getattr altogether if we're asked not to sync */ 2384 if (!(flags & AT_STATX_DONT_SYNC)) { 2385 err = ceph_do_getattr(inode, 2386 statx_to_caps(request_mask, inode->i_mode), 2387 flags & AT_STATX_FORCE_SYNC); 2388 if (err) 2389 return err; 2390 } 2391 2392 generic_fillattr(&init_user_ns, inode, stat); 2393 stat->ino = ceph_present_inode(inode); 2394 2395 /* 2396 * btime on newly-allocated inodes is 0, so if this is still set to 2397 * that, then assume that it's not valid. 2398 */ 2399 if (ci->i_btime.tv_sec || ci->i_btime.tv_nsec) { 2400 stat->btime = ci->i_btime; 2401 valid_mask |= STATX_BTIME; 2402 } 2403 2404 if (ceph_snap(inode) == CEPH_NOSNAP) 2405 stat->dev = inode->i_sb->s_dev; 2406 else 2407 stat->dev = ci->i_snapid_map ? ci->i_snapid_map->dev : 0; 2408 2409 if (S_ISDIR(inode->i_mode)) { 2410 if (ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb), 2411 RBYTES)) 2412 stat->size = ci->i_rbytes; 2413 else 2414 stat->size = ci->i_files + ci->i_subdirs; 2415 stat->blocks = 0; 2416 stat->blksize = 65536; 2417 /* 2418 * Some applications rely on the number of st_nlink 2419 * value on directories to be either 0 (if unlinked) 2420 * or 2 + number of subdirectories. 2421 */ 2422 if (stat->nlink == 1) 2423 /* '.' + '..' + subdirs */ 2424 stat->nlink = 1 + 1 + ci->i_subdirs; 2425 } 2426 2427 stat->result_mask = request_mask & valid_mask; 2428 return err; 2429 } 2430