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