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