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