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