1 #include "ceph_debug.h" 2 3 #include <linux/module.h> 4 #include <linux/fs.h> 5 #include <linux/smp_lock.h> 6 #include <linux/slab.h> 7 #include <linux/string.h> 8 #include <linux/uaccess.h> 9 #include <linux/kernel.h> 10 #include <linux/namei.h> 11 #include <linux/writeback.h> 12 #include <linux/vmalloc.h> 13 #include <linux/pagevec.h> 14 15 #include "super.h" 16 #include "decode.h" 17 18 /* 19 * Ceph inode operations 20 * 21 * Implement basic inode helpers (get, alloc) and inode ops (getattr, 22 * setattr, etc.), xattr helpers, and helpers for assimilating 23 * metadata returned by the MDS into our cache. 24 * 25 * Also define helpers for doing asynchronous writeback, invalidation, 26 * and truncation for the benefit of those who can't afford to block 27 * (typically because they are in the message handler path). 28 */ 29 30 static const struct inode_operations ceph_symlink_iops; 31 32 static void ceph_invalidate_work(struct work_struct *work); 33 static void ceph_writeback_work(struct work_struct *work); 34 static void ceph_vmtruncate_work(struct work_struct *work); 35 36 /* 37 * find or create an inode, given the ceph ino number 38 */ 39 struct inode *ceph_get_inode(struct super_block *sb, struct ceph_vino vino) 40 { 41 struct inode *inode; 42 ino_t t = ceph_vino_to_ino(vino); 43 44 inode = iget5_locked(sb, t, ceph_ino_compare, ceph_set_ino_cb, &vino); 45 if (inode == NULL) 46 return ERR_PTR(-ENOMEM); 47 if (inode->i_state & I_NEW) { 48 dout("get_inode created new inode %p %llx.%llx ino %llx\n", 49 inode, ceph_vinop(inode), (u64)inode->i_ino); 50 unlock_new_inode(inode); 51 } 52 53 dout("get_inode on %lu=%llx.%llx got %p\n", inode->i_ino, vino.ino, 54 vino.snap, inode); 55 return inode; 56 } 57 58 /* 59 * get/constuct snapdir inode for a given directory 60 */ 61 struct inode *ceph_get_snapdir(struct inode *parent) 62 { 63 struct ceph_vino vino = { 64 .ino = ceph_ino(parent), 65 .snap = CEPH_SNAPDIR, 66 }; 67 struct inode *inode = ceph_get_inode(parent->i_sb, vino); 68 struct ceph_inode_info *ci = ceph_inode(inode); 69 70 BUG_ON(!S_ISDIR(parent->i_mode)); 71 if (IS_ERR(inode)) 72 return ERR_PTR(PTR_ERR(inode)); 73 inode->i_mode = parent->i_mode; 74 inode->i_uid = parent->i_uid; 75 inode->i_gid = parent->i_gid; 76 inode->i_op = &ceph_dir_iops; 77 inode->i_fop = &ceph_dir_fops; 78 ci->i_snap_caps = CEPH_CAP_PIN; /* so we can open */ 79 ci->i_rbytes = 0; 80 return inode; 81 } 82 83 const struct inode_operations ceph_file_iops = { 84 .permission = ceph_permission, 85 .setattr = ceph_setattr, 86 .getattr = ceph_getattr, 87 .setxattr = ceph_setxattr, 88 .getxattr = ceph_getxattr, 89 .listxattr = ceph_listxattr, 90 .removexattr = ceph_removexattr, 91 }; 92 93 94 /* 95 * We use a 'frag tree' to keep track of the MDS's directory fragments 96 * for a given inode (usually there is just a single fragment). We 97 * need to know when a child frag is delegated to a new MDS, or when 98 * it is flagged as replicated, so we can direct our requests 99 * accordingly. 100 */ 101 102 /* 103 * find/create a frag in the tree 104 */ 105 static struct ceph_inode_frag *__get_or_create_frag(struct ceph_inode_info *ci, 106 u32 f) 107 { 108 struct rb_node **p; 109 struct rb_node *parent = NULL; 110 struct ceph_inode_frag *frag; 111 int c; 112 113 p = &ci->i_fragtree.rb_node; 114 while (*p) { 115 parent = *p; 116 frag = rb_entry(parent, struct ceph_inode_frag, node); 117 c = ceph_frag_compare(f, frag->frag); 118 if (c < 0) 119 p = &(*p)->rb_left; 120 else if (c > 0) 121 p = &(*p)->rb_right; 122 else 123 return frag; 124 } 125 126 frag = kmalloc(sizeof(*frag), GFP_NOFS); 127 if (!frag) { 128 pr_err("__get_or_create_frag ENOMEM on %p %llx.%llx " 129 "frag %x\n", &ci->vfs_inode, 130 ceph_vinop(&ci->vfs_inode), f); 131 return ERR_PTR(-ENOMEM); 132 } 133 frag->frag = f; 134 frag->split_by = 0; 135 frag->mds = -1; 136 frag->ndist = 0; 137 138 rb_link_node(&frag->node, parent, p); 139 rb_insert_color(&frag->node, &ci->i_fragtree); 140 141 dout("get_or_create_frag added %llx.%llx frag %x\n", 142 ceph_vinop(&ci->vfs_inode), f); 143 return frag; 144 } 145 146 /* 147 * find a specific frag @f 148 */ 149 struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci, u32 f) 150 { 151 struct rb_node *n = ci->i_fragtree.rb_node; 152 153 while (n) { 154 struct ceph_inode_frag *frag = 155 rb_entry(n, struct ceph_inode_frag, node); 156 int c = ceph_frag_compare(f, frag->frag); 157 if (c < 0) 158 n = n->rb_left; 159 else if (c > 0) 160 n = n->rb_right; 161 else 162 return frag; 163 } 164 return NULL; 165 } 166 167 /* 168 * Choose frag containing the given value @v. If @pfrag is 169 * specified, copy the frag delegation info to the caller if 170 * it is present. 171 */ 172 u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v, 173 struct ceph_inode_frag *pfrag, 174 int *found) 175 { 176 u32 t = ceph_frag_make(0, 0); 177 struct ceph_inode_frag *frag; 178 unsigned nway, i; 179 u32 n; 180 181 if (found) 182 *found = 0; 183 184 mutex_lock(&ci->i_fragtree_mutex); 185 while (1) { 186 WARN_ON(!ceph_frag_contains_value(t, v)); 187 frag = __ceph_find_frag(ci, t); 188 if (!frag) 189 break; /* t is a leaf */ 190 if (frag->split_by == 0) { 191 if (pfrag) 192 memcpy(pfrag, frag, sizeof(*pfrag)); 193 if (found) 194 *found = 1; 195 break; 196 } 197 198 /* choose child */ 199 nway = 1 << frag->split_by; 200 dout("choose_frag(%x) %x splits by %d (%d ways)\n", v, t, 201 frag->split_by, nway); 202 for (i = 0; i < nway; i++) { 203 n = ceph_frag_make_child(t, frag->split_by, i); 204 if (ceph_frag_contains_value(n, v)) { 205 t = n; 206 break; 207 } 208 } 209 BUG_ON(i == nway); 210 } 211 dout("choose_frag(%x) = %x\n", v, t); 212 213 mutex_unlock(&ci->i_fragtree_mutex); 214 return t; 215 } 216 217 /* 218 * Process dirfrag (delegation) info from the mds. Include leaf 219 * fragment in tree ONLY if ndist > 0. Otherwise, only 220 * branches/splits are included in i_fragtree) 221 */ 222 static int ceph_fill_dirfrag(struct inode *inode, 223 struct ceph_mds_reply_dirfrag *dirinfo) 224 { 225 struct ceph_inode_info *ci = ceph_inode(inode); 226 struct ceph_inode_frag *frag; 227 u32 id = le32_to_cpu(dirinfo->frag); 228 int mds = le32_to_cpu(dirinfo->auth); 229 int ndist = le32_to_cpu(dirinfo->ndist); 230 int i; 231 int err = 0; 232 233 mutex_lock(&ci->i_fragtree_mutex); 234 if (ndist == 0) { 235 /* no delegation info needed. */ 236 frag = __ceph_find_frag(ci, id); 237 if (!frag) 238 goto out; 239 if (frag->split_by == 0) { 240 /* tree leaf, remove */ 241 dout("fill_dirfrag removed %llx.%llx frag %x" 242 " (no ref)\n", ceph_vinop(inode), id); 243 rb_erase(&frag->node, &ci->i_fragtree); 244 kfree(frag); 245 } else { 246 /* tree branch, keep and clear */ 247 dout("fill_dirfrag cleared %llx.%llx frag %x" 248 " referral\n", ceph_vinop(inode), id); 249 frag->mds = -1; 250 frag->ndist = 0; 251 } 252 goto out; 253 } 254 255 256 /* find/add this frag to store mds delegation info */ 257 frag = __get_or_create_frag(ci, id); 258 if (IS_ERR(frag)) { 259 /* this is not the end of the world; we can continue 260 with bad/inaccurate delegation info */ 261 pr_err("fill_dirfrag ENOMEM on mds ref %llx.%llx fg %x\n", 262 ceph_vinop(inode), le32_to_cpu(dirinfo->frag)); 263 err = -ENOMEM; 264 goto out; 265 } 266 267 frag->mds = mds; 268 frag->ndist = min_t(u32, ndist, CEPH_MAX_DIRFRAG_REP); 269 for (i = 0; i < frag->ndist; i++) 270 frag->dist[i] = le32_to_cpu(dirinfo->dist[i]); 271 dout("fill_dirfrag %llx.%llx frag %x ndist=%d\n", 272 ceph_vinop(inode), frag->frag, frag->ndist); 273 274 out: 275 mutex_unlock(&ci->i_fragtree_mutex); 276 return err; 277 } 278 279 280 /* 281 * initialize a newly allocated inode. 282 */ 283 struct inode *ceph_alloc_inode(struct super_block *sb) 284 { 285 struct ceph_inode_info *ci; 286 int i; 287 288 ci = kmem_cache_alloc(ceph_inode_cachep, GFP_NOFS); 289 if (!ci) 290 return NULL; 291 292 dout("alloc_inode %p\n", &ci->vfs_inode); 293 294 ci->i_version = 0; 295 ci->i_time_warp_seq = 0; 296 ci->i_ceph_flags = 0; 297 ci->i_release_count = 0; 298 ci->i_symlink = NULL; 299 300 ci->i_fragtree = RB_ROOT; 301 mutex_init(&ci->i_fragtree_mutex); 302 303 ci->i_xattrs.blob = NULL; 304 ci->i_xattrs.prealloc_blob = NULL; 305 ci->i_xattrs.dirty = false; 306 ci->i_xattrs.index = RB_ROOT; 307 ci->i_xattrs.count = 0; 308 ci->i_xattrs.names_size = 0; 309 ci->i_xattrs.vals_size = 0; 310 ci->i_xattrs.version = 0; 311 ci->i_xattrs.index_version = 0; 312 313 ci->i_caps = RB_ROOT; 314 ci->i_auth_cap = NULL; 315 ci->i_dirty_caps = 0; 316 ci->i_flushing_caps = 0; 317 INIT_LIST_HEAD(&ci->i_dirty_item); 318 INIT_LIST_HEAD(&ci->i_flushing_item); 319 ci->i_cap_flush_seq = 0; 320 ci->i_cap_flush_last_tid = 0; 321 memset(&ci->i_cap_flush_tid, 0, sizeof(ci->i_cap_flush_tid)); 322 init_waitqueue_head(&ci->i_cap_wq); 323 ci->i_hold_caps_min = 0; 324 ci->i_hold_caps_max = 0; 325 INIT_LIST_HEAD(&ci->i_cap_delay_list); 326 ci->i_cap_exporting_mds = 0; 327 ci->i_cap_exporting_mseq = 0; 328 ci->i_cap_exporting_issued = 0; 329 INIT_LIST_HEAD(&ci->i_cap_snaps); 330 ci->i_head_snapc = NULL; 331 ci->i_snap_caps = 0; 332 333 for (i = 0; i < CEPH_FILE_MODE_NUM; i++) 334 ci->i_nr_by_mode[i] = 0; 335 336 ci->i_truncate_seq = 0; 337 ci->i_truncate_size = 0; 338 ci->i_truncate_pending = 0; 339 340 ci->i_max_size = 0; 341 ci->i_reported_size = 0; 342 ci->i_wanted_max_size = 0; 343 ci->i_requested_max_size = 0; 344 345 ci->i_pin_ref = 0; 346 ci->i_rd_ref = 0; 347 ci->i_rdcache_ref = 0; 348 ci->i_wr_ref = 0; 349 ci->i_wrbuffer_ref = 0; 350 ci->i_wrbuffer_ref_head = 0; 351 ci->i_shared_gen = 0; 352 ci->i_rdcache_gen = 0; 353 ci->i_rdcache_revoking = 0; 354 355 INIT_LIST_HEAD(&ci->i_unsafe_writes); 356 INIT_LIST_HEAD(&ci->i_unsafe_dirops); 357 spin_lock_init(&ci->i_unsafe_lock); 358 359 ci->i_snap_realm = NULL; 360 INIT_LIST_HEAD(&ci->i_snap_realm_item); 361 INIT_LIST_HEAD(&ci->i_snap_flush_item); 362 363 INIT_WORK(&ci->i_wb_work, ceph_writeback_work); 364 INIT_WORK(&ci->i_pg_inv_work, ceph_invalidate_work); 365 366 INIT_WORK(&ci->i_vmtruncate_work, ceph_vmtruncate_work); 367 368 return &ci->vfs_inode; 369 } 370 371 void ceph_destroy_inode(struct inode *inode) 372 { 373 struct ceph_inode_info *ci = ceph_inode(inode); 374 struct ceph_inode_frag *frag; 375 struct rb_node *n; 376 377 dout("destroy_inode %p ino %llx.%llx\n", inode, ceph_vinop(inode)); 378 379 ceph_queue_caps_release(inode); 380 381 /* 382 * we may still have a snap_realm reference if there are stray 383 * caps in i_cap_exporting_issued or i_snap_caps. 384 */ 385 if (ci->i_snap_realm) { 386 struct ceph_mds_client *mdsc = 387 &ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc; 388 struct ceph_snap_realm *realm = ci->i_snap_realm; 389 390 dout(" dropping residual ref to snap realm %p\n", realm); 391 spin_lock(&realm->inodes_with_caps_lock); 392 list_del_init(&ci->i_snap_realm_item); 393 spin_unlock(&realm->inodes_with_caps_lock); 394 ceph_put_snap_realm(mdsc, realm); 395 } 396 397 kfree(ci->i_symlink); 398 while ((n = rb_first(&ci->i_fragtree)) != NULL) { 399 frag = rb_entry(n, struct ceph_inode_frag, node); 400 rb_erase(n, &ci->i_fragtree); 401 kfree(frag); 402 } 403 404 __ceph_destroy_xattrs(ci); 405 if (ci->i_xattrs.blob) 406 ceph_buffer_put(ci->i_xattrs.blob); 407 if (ci->i_xattrs.prealloc_blob) 408 ceph_buffer_put(ci->i_xattrs.prealloc_blob); 409 410 kmem_cache_free(ceph_inode_cachep, ci); 411 } 412 413 414 /* 415 * Helpers to fill in size, ctime, mtime, and atime. We have to be 416 * careful because either the client or MDS may have more up to date 417 * info, depending on which capabilities are held, and whether 418 * time_warp_seq or truncate_seq have increased. (Ordinarily, mtime 419 * and size are monotonically increasing, except when utimes() or 420 * truncate() increments the corresponding _seq values.) 421 */ 422 int ceph_fill_file_size(struct inode *inode, int issued, 423 u32 truncate_seq, u64 truncate_size, u64 size) 424 { 425 struct ceph_inode_info *ci = ceph_inode(inode); 426 int queue_trunc = 0; 427 428 if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) > 0 || 429 (truncate_seq == ci->i_truncate_seq && size > inode->i_size)) { 430 dout("size %lld -> %llu\n", inode->i_size, size); 431 inode->i_size = size; 432 inode->i_blocks = (size + (1<<9) - 1) >> 9; 433 ci->i_reported_size = size; 434 if (truncate_seq != ci->i_truncate_seq) { 435 dout("truncate_seq %u -> %u\n", 436 ci->i_truncate_seq, truncate_seq); 437 ci->i_truncate_seq = truncate_seq; 438 /* 439 * If we hold relevant caps, or in the case where we're 440 * not the only client referencing this file and we 441 * don't hold those caps, then we need to check whether 442 * the file is either opened or mmaped 443 */ 444 if ((issued & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_RD| 445 CEPH_CAP_FILE_WR|CEPH_CAP_FILE_BUFFER| 446 CEPH_CAP_FILE_EXCL)) || 447 mapping_mapped(inode->i_mapping) || 448 __ceph_caps_file_wanted(ci)) { 449 ci->i_truncate_pending++; 450 queue_trunc = 1; 451 } 452 } 453 } 454 if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) >= 0 && 455 ci->i_truncate_size != truncate_size) { 456 dout("truncate_size %lld -> %llu\n", ci->i_truncate_size, 457 truncate_size); 458 ci->i_truncate_size = truncate_size; 459 } 460 return queue_trunc; 461 } 462 463 void ceph_fill_file_time(struct inode *inode, int issued, 464 u64 time_warp_seq, struct timespec *ctime, 465 struct timespec *mtime, struct timespec *atime) 466 { 467 struct ceph_inode_info *ci = ceph_inode(inode); 468 int warn = 0; 469 470 if (issued & (CEPH_CAP_FILE_EXCL| 471 CEPH_CAP_FILE_WR| 472 CEPH_CAP_FILE_BUFFER)) { 473 if (timespec_compare(ctime, &inode->i_ctime) > 0) { 474 dout("ctime %ld.%09ld -> %ld.%09ld inc w/ cap\n", 475 inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec, 476 ctime->tv_sec, ctime->tv_nsec); 477 inode->i_ctime = *ctime; 478 } 479 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) > 0) { 480 /* the MDS did a utimes() */ 481 dout("mtime %ld.%09ld -> %ld.%09ld " 482 "tw %d -> %d\n", 483 inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec, 484 mtime->tv_sec, mtime->tv_nsec, 485 ci->i_time_warp_seq, (int)time_warp_seq); 486 487 inode->i_mtime = *mtime; 488 inode->i_atime = *atime; 489 ci->i_time_warp_seq = time_warp_seq; 490 } else if (time_warp_seq == ci->i_time_warp_seq) { 491 /* nobody did utimes(); take the max */ 492 if (timespec_compare(mtime, &inode->i_mtime) > 0) { 493 dout("mtime %ld.%09ld -> %ld.%09ld inc\n", 494 inode->i_mtime.tv_sec, 495 inode->i_mtime.tv_nsec, 496 mtime->tv_sec, mtime->tv_nsec); 497 inode->i_mtime = *mtime; 498 } 499 if (timespec_compare(atime, &inode->i_atime) > 0) { 500 dout("atime %ld.%09ld -> %ld.%09ld inc\n", 501 inode->i_atime.tv_sec, 502 inode->i_atime.tv_nsec, 503 atime->tv_sec, atime->tv_nsec); 504 inode->i_atime = *atime; 505 } 506 } else if (issued & CEPH_CAP_FILE_EXCL) { 507 /* we did a utimes(); ignore mds values */ 508 } else { 509 warn = 1; 510 } 511 } else { 512 /* we have no write caps; whatever the MDS says is true */ 513 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) >= 0) { 514 inode->i_ctime = *ctime; 515 inode->i_mtime = *mtime; 516 inode->i_atime = *atime; 517 ci->i_time_warp_seq = time_warp_seq; 518 } else { 519 warn = 1; 520 } 521 } 522 if (warn) /* time_warp_seq shouldn't go backwards */ 523 dout("%p mds time_warp_seq %llu < %u\n", 524 inode, time_warp_seq, ci->i_time_warp_seq); 525 } 526 527 /* 528 * Populate an inode based on info from mds. May be called on new or 529 * existing inodes. 530 */ 531 static int fill_inode(struct inode *inode, 532 struct ceph_mds_reply_info_in *iinfo, 533 struct ceph_mds_reply_dirfrag *dirinfo, 534 struct ceph_mds_session *session, 535 unsigned long ttl_from, int cap_fmode, 536 struct ceph_cap_reservation *caps_reservation) 537 { 538 struct ceph_mds_reply_inode *info = iinfo->in; 539 struct ceph_inode_info *ci = ceph_inode(inode); 540 int i; 541 int issued, implemented; 542 struct timespec mtime, atime, ctime; 543 u32 nsplits; 544 struct ceph_buffer *xattr_blob = NULL; 545 int err = 0; 546 int queue_trunc = 0; 547 548 dout("fill_inode %p ino %llx.%llx v %llu had %llu\n", 549 inode, ceph_vinop(inode), le64_to_cpu(info->version), 550 ci->i_version); 551 552 /* 553 * prealloc xattr data, if it looks like we'll need it. only 554 * if len > 4 (meaning there are actually xattrs; the first 4 555 * bytes are the xattr count). 556 */ 557 if (iinfo->xattr_len > 4) { 558 xattr_blob = ceph_buffer_new(iinfo->xattr_len, GFP_NOFS); 559 if (!xattr_blob) 560 pr_err("fill_inode ENOMEM xattr blob %d bytes\n", 561 iinfo->xattr_len); 562 } 563 564 spin_lock(&inode->i_lock); 565 566 /* 567 * provided version will be odd if inode value is projected, 568 * even if stable. skip the update if we have a newer info 569 * (e.g., due to inode info racing form multiple MDSs), or if 570 * we are getting projected (unstable) inode info. 571 */ 572 if (le64_to_cpu(info->version) > 0 && 573 (ci->i_version & ~1) > le64_to_cpu(info->version)) 574 goto no_change; 575 576 issued = __ceph_caps_issued(ci, &implemented); 577 issued |= implemented | __ceph_caps_dirty(ci); 578 579 /* update inode */ 580 ci->i_version = le64_to_cpu(info->version); 581 inode->i_version++; 582 inode->i_rdev = le32_to_cpu(info->rdev); 583 584 if ((issued & CEPH_CAP_AUTH_EXCL) == 0) { 585 inode->i_mode = le32_to_cpu(info->mode); 586 inode->i_uid = le32_to_cpu(info->uid); 587 inode->i_gid = le32_to_cpu(info->gid); 588 dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode, 589 inode->i_uid, inode->i_gid); 590 } 591 592 if ((issued & CEPH_CAP_LINK_EXCL) == 0) 593 inode->i_nlink = le32_to_cpu(info->nlink); 594 595 /* be careful with mtime, atime, size */ 596 ceph_decode_timespec(&atime, &info->atime); 597 ceph_decode_timespec(&mtime, &info->mtime); 598 ceph_decode_timespec(&ctime, &info->ctime); 599 queue_trunc = ceph_fill_file_size(inode, issued, 600 le32_to_cpu(info->truncate_seq), 601 le64_to_cpu(info->truncate_size), 602 le64_to_cpu(info->size)); 603 ceph_fill_file_time(inode, issued, 604 le32_to_cpu(info->time_warp_seq), 605 &ctime, &mtime, &atime); 606 607 ci->i_max_size = le64_to_cpu(info->max_size); 608 ci->i_layout = info->layout; 609 inode->i_blkbits = fls(le32_to_cpu(info->layout.fl_stripe_unit)) - 1; 610 611 /* xattrs */ 612 /* note that if i_xattrs.len <= 4, i_xattrs.data will still be NULL. */ 613 if ((issued & CEPH_CAP_XATTR_EXCL) == 0 && 614 le64_to_cpu(info->xattr_version) > ci->i_xattrs.version) { 615 if (ci->i_xattrs.blob) 616 ceph_buffer_put(ci->i_xattrs.blob); 617 ci->i_xattrs.blob = xattr_blob; 618 if (xattr_blob) 619 memcpy(ci->i_xattrs.blob->vec.iov_base, 620 iinfo->xattr_data, iinfo->xattr_len); 621 ci->i_xattrs.version = le64_to_cpu(info->xattr_version); 622 xattr_blob = NULL; 623 } 624 625 inode->i_mapping->a_ops = &ceph_aops; 626 inode->i_mapping->backing_dev_info = 627 &ceph_sb_to_client(inode->i_sb)->backing_dev_info; 628 629 switch (inode->i_mode & S_IFMT) { 630 case S_IFIFO: 631 case S_IFBLK: 632 case S_IFCHR: 633 case S_IFSOCK: 634 init_special_inode(inode, inode->i_mode, inode->i_rdev); 635 inode->i_op = &ceph_file_iops; 636 break; 637 case S_IFREG: 638 inode->i_op = &ceph_file_iops; 639 inode->i_fop = &ceph_file_fops; 640 break; 641 case S_IFLNK: 642 inode->i_op = &ceph_symlink_iops; 643 if (!ci->i_symlink) { 644 int symlen = iinfo->symlink_len; 645 char *sym; 646 647 BUG_ON(symlen != inode->i_size); 648 spin_unlock(&inode->i_lock); 649 650 err = -ENOMEM; 651 sym = kmalloc(symlen+1, GFP_NOFS); 652 if (!sym) 653 goto out; 654 memcpy(sym, iinfo->symlink, symlen); 655 sym[symlen] = 0; 656 657 spin_lock(&inode->i_lock); 658 if (!ci->i_symlink) 659 ci->i_symlink = sym; 660 else 661 kfree(sym); /* lost a race */ 662 } 663 break; 664 case S_IFDIR: 665 inode->i_op = &ceph_dir_iops; 666 inode->i_fop = &ceph_dir_fops; 667 668 ci->i_files = le64_to_cpu(info->files); 669 ci->i_subdirs = le64_to_cpu(info->subdirs); 670 ci->i_rbytes = le64_to_cpu(info->rbytes); 671 ci->i_rfiles = le64_to_cpu(info->rfiles); 672 ci->i_rsubdirs = le64_to_cpu(info->rsubdirs); 673 ceph_decode_timespec(&ci->i_rctime, &info->rctime); 674 675 /* set dir completion flag? */ 676 if (ci->i_files == 0 && ci->i_subdirs == 0 && 677 ceph_snap(inode) == CEPH_NOSNAP && 678 (le32_to_cpu(info->cap.caps) & CEPH_CAP_FILE_SHARED)) { 679 dout(" marking %p complete (empty)\n", inode); 680 ci->i_ceph_flags |= CEPH_I_COMPLETE; 681 ci->i_max_offset = 2; 682 } 683 684 /* it may be better to set st_size in getattr instead? */ 685 if (ceph_test_opt(ceph_sb_to_client(inode->i_sb), RBYTES)) 686 inode->i_size = ci->i_rbytes; 687 break; 688 default: 689 pr_err("fill_inode %llx.%llx BAD mode 0%o\n", 690 ceph_vinop(inode), inode->i_mode); 691 } 692 693 no_change: 694 spin_unlock(&inode->i_lock); 695 696 /* queue truncate if we saw i_size decrease */ 697 if (queue_trunc) 698 ceph_queue_vmtruncate(inode); 699 700 /* populate frag tree */ 701 /* FIXME: move me up, if/when version reflects fragtree changes */ 702 nsplits = le32_to_cpu(info->fragtree.nsplits); 703 mutex_lock(&ci->i_fragtree_mutex); 704 for (i = 0; i < nsplits; i++) { 705 u32 id = le32_to_cpu(info->fragtree.splits[i].frag); 706 struct ceph_inode_frag *frag = __get_or_create_frag(ci, id); 707 708 if (IS_ERR(frag)) 709 continue; 710 frag->split_by = le32_to_cpu(info->fragtree.splits[i].by); 711 dout(" frag %x split by %d\n", frag->frag, frag->split_by); 712 } 713 mutex_unlock(&ci->i_fragtree_mutex); 714 715 /* were we issued a capability? */ 716 if (info->cap.caps) { 717 if (ceph_snap(inode) == CEPH_NOSNAP) { 718 ceph_add_cap(inode, session, 719 le64_to_cpu(info->cap.cap_id), 720 cap_fmode, 721 le32_to_cpu(info->cap.caps), 722 le32_to_cpu(info->cap.wanted), 723 le32_to_cpu(info->cap.seq), 724 le32_to_cpu(info->cap.mseq), 725 le64_to_cpu(info->cap.realm), 726 info->cap.flags, 727 caps_reservation); 728 } else { 729 spin_lock(&inode->i_lock); 730 dout(" %p got snap_caps %s\n", inode, 731 ceph_cap_string(le32_to_cpu(info->cap.caps))); 732 ci->i_snap_caps |= le32_to_cpu(info->cap.caps); 733 if (cap_fmode >= 0) 734 __ceph_get_fmode(ci, cap_fmode); 735 spin_unlock(&inode->i_lock); 736 } 737 } else if (cap_fmode >= 0) { 738 pr_warning("mds issued no caps on %llx.%llx\n", 739 ceph_vinop(inode)); 740 __ceph_get_fmode(ci, cap_fmode); 741 } 742 743 /* update delegation info? */ 744 if (dirinfo) 745 ceph_fill_dirfrag(inode, dirinfo); 746 747 err = 0; 748 749 out: 750 if (xattr_blob) 751 ceph_buffer_put(xattr_blob); 752 return err; 753 } 754 755 /* 756 * caller should hold session s_mutex. 757 */ 758 static void update_dentry_lease(struct dentry *dentry, 759 struct ceph_mds_reply_lease *lease, 760 struct ceph_mds_session *session, 761 unsigned long from_time) 762 { 763 struct ceph_dentry_info *di = ceph_dentry(dentry); 764 long unsigned duration = le32_to_cpu(lease->duration_ms); 765 long unsigned ttl = from_time + (duration * HZ) / 1000; 766 long unsigned half_ttl = from_time + (duration * HZ / 2) / 1000; 767 struct inode *dir; 768 769 /* only track leases on regular dentries */ 770 if (dentry->d_op != &ceph_dentry_ops) 771 return; 772 773 spin_lock(&dentry->d_lock); 774 dout("update_dentry_lease %p mask %d duration %lu ms ttl %lu\n", 775 dentry, le16_to_cpu(lease->mask), duration, ttl); 776 777 /* make lease_rdcache_gen match directory */ 778 dir = dentry->d_parent->d_inode; 779 di->lease_shared_gen = ceph_inode(dir)->i_shared_gen; 780 781 if (lease->mask == 0) 782 goto out_unlock; 783 784 if (di->lease_gen == session->s_cap_gen && 785 time_before(ttl, dentry->d_time)) 786 goto out_unlock; /* we already have a newer lease. */ 787 788 if (di->lease_session && di->lease_session != session) 789 goto out_unlock; 790 791 ceph_dentry_lru_touch(dentry); 792 793 if (!di->lease_session) 794 di->lease_session = ceph_get_mds_session(session); 795 di->lease_gen = session->s_cap_gen; 796 di->lease_seq = le32_to_cpu(lease->seq); 797 di->lease_renew_after = half_ttl; 798 di->lease_renew_from = 0; 799 dentry->d_time = ttl; 800 out_unlock: 801 spin_unlock(&dentry->d_lock); 802 return; 803 } 804 805 /* 806 * splice a dentry to an inode. 807 * caller must hold directory i_mutex for this to be safe. 808 * 809 * we will only rehash the resulting dentry if @prehash is 810 * true; @prehash will be set to false (for the benefit of 811 * the caller) if we fail. 812 */ 813 static struct dentry *splice_dentry(struct dentry *dn, struct inode *in, 814 bool *prehash) 815 { 816 struct dentry *realdn; 817 818 /* dn must be unhashed */ 819 if (!d_unhashed(dn)) 820 d_drop(dn); 821 realdn = d_materialise_unique(dn, in); 822 if (IS_ERR(realdn)) { 823 pr_err("splice_dentry error %p inode %p ino %llx.%llx\n", 824 dn, in, ceph_vinop(in)); 825 if (prehash) 826 *prehash = false; /* don't rehash on error */ 827 dn = realdn; /* note realdn contains the error */ 828 goto out; 829 } else if (realdn) { 830 dout("dn %p (%d) spliced with %p (%d) " 831 "inode %p ino %llx.%llx\n", 832 dn, atomic_read(&dn->d_count), 833 realdn, atomic_read(&realdn->d_count), 834 realdn->d_inode, ceph_vinop(realdn->d_inode)); 835 dput(dn); 836 dn = realdn; 837 } else { 838 BUG_ON(!ceph_dentry(dn)); 839 840 dout("dn %p attached to %p ino %llx.%llx\n", 841 dn, dn->d_inode, ceph_vinop(dn->d_inode)); 842 } 843 if ((!prehash || *prehash) && d_unhashed(dn)) 844 d_rehash(dn); 845 out: 846 return dn; 847 } 848 849 /* 850 * Set dentry's directory position based on the current dir's max, and 851 * order it in d_subdirs, so that dcache_readdir behaves. 852 */ 853 static void ceph_set_dentry_offset(struct dentry *dn) 854 { 855 struct dentry *dir = dn->d_parent; 856 struct inode *inode = dn->d_parent->d_inode; 857 struct ceph_dentry_info *di; 858 859 BUG_ON(!inode); 860 861 di = ceph_dentry(dn); 862 863 spin_lock(&inode->i_lock); 864 di->offset = ceph_inode(inode)->i_max_offset++; 865 spin_unlock(&inode->i_lock); 866 867 spin_lock(&dcache_lock); 868 spin_lock(&dn->d_lock); 869 list_move_tail(&dir->d_subdirs, &dn->d_u.d_child); 870 dout("set_dentry_offset %p %lld (%p %p)\n", dn, di->offset, 871 dn->d_u.d_child.prev, dn->d_u.d_child.next); 872 spin_unlock(&dn->d_lock); 873 spin_unlock(&dcache_lock); 874 } 875 876 /* 877 * Incorporate results into the local cache. This is either just 878 * one inode, or a directory, dentry, and possibly linked-to inode (e.g., 879 * after a lookup). 880 * 881 * A reply may contain 882 * a directory inode along with a dentry. 883 * and/or a target inode 884 * 885 * Called with snap_rwsem (read). 886 */ 887 int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req, 888 struct ceph_mds_session *session) 889 { 890 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info; 891 struct inode *in = NULL; 892 struct ceph_mds_reply_inode *ininfo; 893 struct ceph_vino vino; 894 struct ceph_client *client = ceph_sb_to_client(sb); 895 int i = 0; 896 int err = 0; 897 898 dout("fill_trace %p is_dentry %d is_target %d\n", req, 899 rinfo->head->is_dentry, rinfo->head->is_target); 900 901 #if 0 902 /* 903 * Debugging hook: 904 * 905 * If we resend completed ops to a recovering mds, we get no 906 * trace. Since that is very rare, pretend this is the case 907 * to ensure the 'no trace' handlers in the callers behave. 908 * 909 * Fill in inodes unconditionally to avoid breaking cap 910 * invariants. 911 */ 912 if (rinfo->head->op & CEPH_MDS_OP_WRITE) { 913 pr_info("fill_trace faking empty trace on %lld %s\n", 914 req->r_tid, ceph_mds_op_name(rinfo->head->op)); 915 if (rinfo->head->is_dentry) { 916 rinfo->head->is_dentry = 0; 917 err = fill_inode(req->r_locked_dir, 918 &rinfo->diri, rinfo->dirfrag, 919 session, req->r_request_started, -1); 920 } 921 if (rinfo->head->is_target) { 922 rinfo->head->is_target = 0; 923 ininfo = rinfo->targeti.in; 924 vino.ino = le64_to_cpu(ininfo->ino); 925 vino.snap = le64_to_cpu(ininfo->snapid); 926 in = ceph_get_inode(sb, vino); 927 err = fill_inode(in, &rinfo->targeti, NULL, 928 session, req->r_request_started, 929 req->r_fmode); 930 iput(in); 931 } 932 } 933 #endif 934 935 if (!rinfo->head->is_target && !rinfo->head->is_dentry) { 936 dout("fill_trace reply is empty!\n"); 937 if (rinfo->head->result == 0 && req->r_locked_dir) { 938 struct ceph_inode_info *ci = 939 ceph_inode(req->r_locked_dir); 940 dout(" clearing %p complete (empty trace)\n", 941 req->r_locked_dir); 942 spin_lock(&req->r_locked_dir->i_lock); 943 ci->i_ceph_flags &= ~CEPH_I_COMPLETE; 944 ci->i_release_count++; 945 spin_unlock(&req->r_locked_dir->i_lock); 946 947 if (req->r_dentry) 948 ceph_invalidate_dentry_lease(req->r_dentry); 949 if (req->r_old_dentry) 950 ceph_invalidate_dentry_lease(req->r_old_dentry); 951 } 952 return 0; 953 } 954 955 if (rinfo->head->is_dentry) { 956 struct inode *dir = req->r_locked_dir; 957 958 err = fill_inode(dir, &rinfo->diri, rinfo->dirfrag, 959 session, req->r_request_started, -1, 960 &req->r_caps_reservation); 961 if (err < 0) 962 return err; 963 } 964 965 /* 966 * ignore null lease/binding on snapdir ENOENT, or else we 967 * will have trouble splicing in the virtual snapdir later 968 */ 969 if (rinfo->head->is_dentry && !req->r_aborted && 970 (rinfo->head->is_target || strncmp(req->r_dentry->d_name.name, 971 client->mount_args->snapdir_name, 972 req->r_dentry->d_name.len))) { 973 /* 974 * lookup link rename : null -> possibly existing inode 975 * mknod symlink mkdir : null -> new inode 976 * unlink : linked -> null 977 */ 978 struct inode *dir = req->r_locked_dir; 979 struct dentry *dn = req->r_dentry; 980 bool have_dir_cap, have_lease; 981 982 BUG_ON(!dn); 983 BUG_ON(!dir); 984 BUG_ON(dn->d_parent->d_inode != dir); 985 BUG_ON(ceph_ino(dir) != 986 le64_to_cpu(rinfo->diri.in->ino)); 987 BUG_ON(ceph_snap(dir) != 988 le64_to_cpu(rinfo->diri.in->snapid)); 989 990 /* do we have a lease on the whole dir? */ 991 have_dir_cap = 992 (le32_to_cpu(rinfo->diri.in->cap.caps) & 993 CEPH_CAP_FILE_SHARED); 994 995 /* do we have a dn lease? */ 996 have_lease = have_dir_cap || 997 (le16_to_cpu(rinfo->dlease->mask) & 998 CEPH_LOCK_DN); 999 1000 if (!have_lease) 1001 dout("fill_trace no dentry lease or dir cap\n"); 1002 1003 /* rename? */ 1004 if (req->r_old_dentry && req->r_op == CEPH_MDS_OP_RENAME) { 1005 dout(" src %p '%.*s' dst %p '%.*s'\n", 1006 req->r_old_dentry, 1007 req->r_old_dentry->d_name.len, 1008 req->r_old_dentry->d_name.name, 1009 dn, dn->d_name.len, dn->d_name.name); 1010 dout("fill_trace doing d_move %p -> %p\n", 1011 req->r_old_dentry, dn); 1012 1013 /* d_move screws up d_subdirs order */ 1014 ceph_i_clear(dir, CEPH_I_COMPLETE); 1015 1016 d_move(req->r_old_dentry, dn); 1017 dout(" src %p '%.*s' dst %p '%.*s'\n", 1018 req->r_old_dentry, 1019 req->r_old_dentry->d_name.len, 1020 req->r_old_dentry->d_name.name, 1021 dn, dn->d_name.len, dn->d_name.name); 1022 1023 /* ensure target dentry is invalidated, despite 1024 rehashing bug in vfs_rename_dir */ 1025 ceph_invalidate_dentry_lease(dn); 1026 1027 /* take overwritten dentry's readdir offset */ 1028 ceph_dentry(req->r_old_dentry)->offset = 1029 ceph_dentry(dn)->offset; 1030 1031 dn = req->r_old_dentry; /* use old_dentry */ 1032 in = dn->d_inode; 1033 } 1034 1035 /* null dentry? */ 1036 if (!rinfo->head->is_target) { 1037 dout("fill_trace null dentry\n"); 1038 if (dn->d_inode) { 1039 dout("d_delete %p\n", dn); 1040 d_delete(dn); 1041 } else { 1042 dout("d_instantiate %p NULL\n", dn); 1043 d_instantiate(dn, NULL); 1044 if (have_lease && d_unhashed(dn)) 1045 d_rehash(dn); 1046 update_dentry_lease(dn, rinfo->dlease, 1047 session, 1048 req->r_request_started); 1049 } 1050 goto done; 1051 } 1052 1053 /* attach proper inode */ 1054 ininfo = rinfo->targeti.in; 1055 vino.ino = le64_to_cpu(ininfo->ino); 1056 vino.snap = le64_to_cpu(ininfo->snapid); 1057 if (!dn->d_inode) { 1058 in = ceph_get_inode(sb, vino); 1059 if (IS_ERR(in)) { 1060 pr_err("fill_trace bad get_inode " 1061 "%llx.%llx\n", vino.ino, vino.snap); 1062 err = PTR_ERR(in); 1063 d_delete(dn); 1064 goto done; 1065 } 1066 dn = splice_dentry(dn, in, &have_lease); 1067 if (IS_ERR(dn)) { 1068 err = PTR_ERR(dn); 1069 goto done; 1070 } 1071 req->r_dentry = dn; /* may have spliced */ 1072 ceph_set_dentry_offset(dn); 1073 igrab(in); 1074 } else if (ceph_ino(in) == vino.ino && 1075 ceph_snap(in) == vino.snap) { 1076 igrab(in); 1077 } else { 1078 dout(" %p links to %p %llx.%llx, not %llx.%llx\n", 1079 dn, in, ceph_ino(in), ceph_snap(in), 1080 vino.ino, vino.snap); 1081 have_lease = false; 1082 in = NULL; 1083 } 1084 1085 if (have_lease) 1086 update_dentry_lease(dn, rinfo->dlease, session, 1087 req->r_request_started); 1088 dout(" final dn %p\n", dn); 1089 i++; 1090 } else if (req->r_op == CEPH_MDS_OP_LOOKUPSNAP || 1091 req->r_op == CEPH_MDS_OP_MKSNAP) { 1092 struct dentry *dn = req->r_dentry; 1093 1094 /* fill out a snapdir LOOKUPSNAP dentry */ 1095 BUG_ON(!dn); 1096 BUG_ON(!req->r_locked_dir); 1097 BUG_ON(ceph_snap(req->r_locked_dir) != CEPH_SNAPDIR); 1098 ininfo = rinfo->targeti.in; 1099 vino.ino = le64_to_cpu(ininfo->ino); 1100 vino.snap = le64_to_cpu(ininfo->snapid); 1101 in = ceph_get_inode(sb, vino); 1102 if (IS_ERR(in)) { 1103 pr_err("fill_inode get_inode badness %llx.%llx\n", 1104 vino.ino, vino.snap); 1105 err = PTR_ERR(in); 1106 d_delete(dn); 1107 goto done; 1108 } 1109 dout(" linking snapped dir %p to dn %p\n", in, dn); 1110 dn = splice_dentry(dn, in, NULL); 1111 if (IS_ERR(dn)) { 1112 err = PTR_ERR(dn); 1113 goto done; 1114 } 1115 ceph_set_dentry_offset(dn); 1116 req->r_dentry = dn; /* may have spliced */ 1117 igrab(in); 1118 rinfo->head->is_dentry = 1; /* fool notrace handlers */ 1119 } 1120 1121 if (rinfo->head->is_target) { 1122 vino.ino = le64_to_cpu(rinfo->targeti.in->ino); 1123 vino.snap = le64_to_cpu(rinfo->targeti.in->snapid); 1124 1125 if (in == NULL || ceph_ino(in) != vino.ino || 1126 ceph_snap(in) != vino.snap) { 1127 in = ceph_get_inode(sb, vino); 1128 if (IS_ERR(in)) { 1129 err = PTR_ERR(in); 1130 goto done; 1131 } 1132 } 1133 req->r_target_inode = in; 1134 1135 err = fill_inode(in, 1136 &rinfo->targeti, NULL, 1137 session, req->r_request_started, 1138 (le32_to_cpu(rinfo->head->result) == 0) ? 1139 req->r_fmode : -1, 1140 &req->r_caps_reservation); 1141 if (err < 0) { 1142 pr_err("fill_inode badness %p %llx.%llx\n", 1143 in, ceph_vinop(in)); 1144 goto done; 1145 } 1146 } 1147 1148 done: 1149 dout("fill_trace done err=%d\n", err); 1150 return err; 1151 } 1152 1153 /* 1154 * Prepopulate our cache with readdir results, leases, etc. 1155 */ 1156 int ceph_readdir_prepopulate(struct ceph_mds_request *req, 1157 struct ceph_mds_session *session) 1158 { 1159 struct dentry *parent = req->r_dentry; 1160 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info; 1161 struct qstr dname; 1162 struct dentry *dn; 1163 struct inode *in; 1164 int err = 0, i; 1165 struct inode *snapdir = NULL; 1166 struct ceph_mds_request_head *rhead = req->r_request->front.iov_base; 1167 u64 frag = le32_to_cpu(rhead->args.readdir.frag); 1168 struct ceph_dentry_info *di; 1169 1170 if (le32_to_cpu(rinfo->head->op) == CEPH_MDS_OP_LSSNAP) { 1171 snapdir = ceph_get_snapdir(parent->d_inode); 1172 parent = d_find_alias(snapdir); 1173 dout("readdir_prepopulate %d items under SNAPDIR dn %p\n", 1174 rinfo->dir_nr, parent); 1175 } else { 1176 dout("readdir_prepopulate %d items under dn %p\n", 1177 rinfo->dir_nr, parent); 1178 if (rinfo->dir_dir) 1179 ceph_fill_dirfrag(parent->d_inode, rinfo->dir_dir); 1180 } 1181 1182 for (i = 0; i < rinfo->dir_nr; i++) { 1183 struct ceph_vino vino; 1184 1185 dname.name = rinfo->dir_dname[i]; 1186 dname.len = rinfo->dir_dname_len[i]; 1187 dname.hash = full_name_hash(dname.name, dname.len); 1188 1189 vino.ino = le64_to_cpu(rinfo->dir_in[i].in->ino); 1190 vino.snap = le64_to_cpu(rinfo->dir_in[i].in->snapid); 1191 1192 retry_lookup: 1193 dn = d_lookup(parent, &dname); 1194 dout("d_lookup on parent=%p name=%.*s got %p\n", 1195 parent, dname.len, dname.name, dn); 1196 1197 if (!dn) { 1198 dn = d_alloc(parent, &dname); 1199 dout("d_alloc %p '%.*s' = %p\n", parent, 1200 dname.len, dname.name, dn); 1201 if (dn == NULL) { 1202 dout("d_alloc badness\n"); 1203 err = -ENOMEM; 1204 goto out; 1205 } 1206 err = ceph_init_dentry(dn); 1207 if (err < 0) 1208 goto out; 1209 } else if (dn->d_inode && 1210 (ceph_ino(dn->d_inode) != vino.ino || 1211 ceph_snap(dn->d_inode) != vino.snap)) { 1212 dout(" dn %p points to wrong inode %p\n", 1213 dn, dn->d_inode); 1214 d_delete(dn); 1215 dput(dn); 1216 goto retry_lookup; 1217 } else { 1218 /* reorder parent's d_subdirs */ 1219 spin_lock(&dcache_lock); 1220 spin_lock(&dn->d_lock); 1221 list_move(&dn->d_u.d_child, &parent->d_subdirs); 1222 spin_unlock(&dn->d_lock); 1223 spin_unlock(&dcache_lock); 1224 } 1225 1226 di = dn->d_fsdata; 1227 di->offset = ceph_make_fpos(frag, i + req->r_readdir_offset); 1228 1229 /* inode */ 1230 if (dn->d_inode) { 1231 in = dn->d_inode; 1232 } else { 1233 in = ceph_get_inode(parent->d_sb, vino); 1234 if (in == NULL) { 1235 dout("new_inode badness\n"); 1236 d_delete(dn); 1237 dput(dn); 1238 err = -ENOMEM; 1239 goto out; 1240 } 1241 dn = splice_dentry(dn, in, NULL); 1242 } 1243 1244 if (fill_inode(in, &rinfo->dir_in[i], NULL, session, 1245 req->r_request_started, -1, 1246 &req->r_caps_reservation) < 0) { 1247 pr_err("fill_inode badness on %p\n", in); 1248 dput(dn); 1249 continue; 1250 } 1251 update_dentry_lease(dn, rinfo->dir_dlease[i], 1252 req->r_session, req->r_request_started); 1253 dput(dn); 1254 } 1255 req->r_did_prepopulate = true; 1256 1257 out: 1258 if (snapdir) { 1259 iput(snapdir); 1260 dput(parent); 1261 } 1262 dout("readdir_prepopulate done\n"); 1263 return err; 1264 } 1265 1266 int ceph_inode_set_size(struct inode *inode, loff_t size) 1267 { 1268 struct ceph_inode_info *ci = ceph_inode(inode); 1269 int ret = 0; 1270 1271 spin_lock(&inode->i_lock); 1272 dout("set_size %p %llu -> %llu\n", inode, inode->i_size, size); 1273 inode->i_size = size; 1274 inode->i_blocks = (size + (1 << 9) - 1) >> 9; 1275 1276 /* tell the MDS if we are approaching max_size */ 1277 if ((size << 1) >= ci->i_max_size && 1278 (ci->i_reported_size << 1) < ci->i_max_size) 1279 ret = 1; 1280 1281 spin_unlock(&inode->i_lock); 1282 return ret; 1283 } 1284 1285 /* 1286 * Write back inode data in a worker thread. (This can't be done 1287 * in the message handler context.) 1288 */ 1289 void ceph_queue_writeback(struct inode *inode) 1290 { 1291 if (queue_work(ceph_inode_to_client(inode)->wb_wq, 1292 &ceph_inode(inode)->i_wb_work)) { 1293 dout("ceph_queue_writeback %p\n", inode); 1294 igrab(inode); 1295 } else { 1296 dout("ceph_queue_writeback %p failed\n", inode); 1297 } 1298 } 1299 1300 static void ceph_writeback_work(struct work_struct *work) 1301 { 1302 struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info, 1303 i_wb_work); 1304 struct inode *inode = &ci->vfs_inode; 1305 1306 dout("writeback %p\n", inode); 1307 filemap_fdatawrite(&inode->i_data); 1308 iput(inode); 1309 } 1310 1311 /* 1312 * queue an async invalidation 1313 */ 1314 void ceph_queue_invalidate(struct inode *inode) 1315 { 1316 if (queue_work(ceph_inode_to_client(inode)->pg_inv_wq, 1317 &ceph_inode(inode)->i_pg_inv_work)) { 1318 dout("ceph_queue_invalidate %p\n", inode); 1319 igrab(inode); 1320 } else { 1321 dout("ceph_queue_invalidate %p failed\n", inode); 1322 } 1323 } 1324 1325 /* 1326 * invalidate any pages that are not dirty or under writeback. this 1327 * includes pages that are clean and mapped. 1328 */ 1329 static void ceph_invalidate_nondirty_pages(struct address_space *mapping) 1330 { 1331 struct pagevec pvec; 1332 pgoff_t next = 0; 1333 int i; 1334 1335 pagevec_init(&pvec, 0); 1336 while (pagevec_lookup(&pvec, mapping, next, PAGEVEC_SIZE)) { 1337 for (i = 0; i < pagevec_count(&pvec); i++) { 1338 struct page *page = pvec.pages[i]; 1339 pgoff_t index; 1340 int skip_page = 1341 (PageDirty(page) || PageWriteback(page)); 1342 1343 if (!skip_page) 1344 skip_page = !trylock_page(page); 1345 1346 /* 1347 * We really shouldn't be looking at the ->index of an 1348 * unlocked page. But we're not allowed to lock these 1349 * pages. So we rely upon nobody altering the ->index 1350 * of this (pinned-by-us) page. 1351 */ 1352 index = page->index; 1353 if (index > next) 1354 next = index; 1355 next++; 1356 1357 if (skip_page) 1358 continue; 1359 1360 generic_error_remove_page(mapping, page); 1361 unlock_page(page); 1362 } 1363 pagevec_release(&pvec); 1364 cond_resched(); 1365 } 1366 } 1367 1368 /* 1369 * Invalidate inode pages in a worker thread. (This can't be done 1370 * in the message handler context.) 1371 */ 1372 static void ceph_invalidate_work(struct work_struct *work) 1373 { 1374 struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info, 1375 i_pg_inv_work); 1376 struct inode *inode = &ci->vfs_inode; 1377 u32 orig_gen; 1378 int check = 0; 1379 1380 spin_lock(&inode->i_lock); 1381 dout("invalidate_pages %p gen %d revoking %d\n", inode, 1382 ci->i_rdcache_gen, ci->i_rdcache_revoking); 1383 if (ci->i_rdcache_gen == 0 || 1384 ci->i_rdcache_revoking != ci->i_rdcache_gen) { 1385 BUG_ON(ci->i_rdcache_revoking > ci->i_rdcache_gen); 1386 /* nevermind! */ 1387 ci->i_rdcache_revoking = 0; 1388 spin_unlock(&inode->i_lock); 1389 goto out; 1390 } 1391 orig_gen = ci->i_rdcache_gen; 1392 spin_unlock(&inode->i_lock); 1393 1394 ceph_invalidate_nondirty_pages(inode->i_mapping); 1395 1396 spin_lock(&inode->i_lock); 1397 if (orig_gen == ci->i_rdcache_gen) { 1398 dout("invalidate_pages %p gen %d successful\n", inode, 1399 ci->i_rdcache_gen); 1400 ci->i_rdcache_gen = 0; 1401 ci->i_rdcache_revoking = 0; 1402 check = 1; 1403 } else { 1404 dout("invalidate_pages %p gen %d raced, gen now %d\n", 1405 inode, orig_gen, ci->i_rdcache_gen); 1406 } 1407 spin_unlock(&inode->i_lock); 1408 1409 if (check) 1410 ceph_check_caps(ci, 0, NULL); 1411 out: 1412 iput(inode); 1413 } 1414 1415 1416 /* 1417 * called by trunc_wq; take i_mutex ourselves 1418 * 1419 * We also truncate in a separate thread as well. 1420 */ 1421 static void ceph_vmtruncate_work(struct work_struct *work) 1422 { 1423 struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info, 1424 i_vmtruncate_work); 1425 struct inode *inode = &ci->vfs_inode; 1426 1427 dout("vmtruncate_work %p\n", inode); 1428 mutex_lock(&inode->i_mutex); 1429 __ceph_do_pending_vmtruncate(inode); 1430 mutex_unlock(&inode->i_mutex); 1431 iput(inode); 1432 } 1433 1434 /* 1435 * Queue an async vmtruncate. If we fail to queue work, we will handle 1436 * the truncation the next time we call __ceph_do_pending_vmtruncate. 1437 */ 1438 void ceph_queue_vmtruncate(struct inode *inode) 1439 { 1440 struct ceph_inode_info *ci = ceph_inode(inode); 1441 1442 if (queue_work(ceph_sb_to_client(inode->i_sb)->trunc_wq, 1443 &ci->i_vmtruncate_work)) { 1444 dout("ceph_queue_vmtruncate %p\n", inode); 1445 igrab(inode); 1446 } else { 1447 dout("ceph_queue_vmtruncate %p failed, pending=%d\n", 1448 inode, ci->i_truncate_pending); 1449 } 1450 } 1451 1452 /* 1453 * called with i_mutex held. 1454 * 1455 * Make sure any pending truncation is applied before doing anything 1456 * that may depend on it. 1457 */ 1458 void __ceph_do_pending_vmtruncate(struct inode *inode) 1459 { 1460 struct ceph_inode_info *ci = ceph_inode(inode); 1461 u64 to; 1462 int wrbuffer_refs, wake = 0; 1463 1464 retry: 1465 spin_lock(&inode->i_lock); 1466 if (ci->i_truncate_pending == 0) { 1467 dout("__do_pending_vmtruncate %p none pending\n", inode); 1468 spin_unlock(&inode->i_lock); 1469 return; 1470 } 1471 1472 /* 1473 * make sure any dirty snapped pages are flushed before we 1474 * possibly truncate them.. so write AND block! 1475 */ 1476 if (ci->i_wrbuffer_ref_head < ci->i_wrbuffer_ref) { 1477 dout("__do_pending_vmtruncate %p flushing snaps first\n", 1478 inode); 1479 spin_unlock(&inode->i_lock); 1480 filemap_write_and_wait_range(&inode->i_data, 0, 1481 inode->i_sb->s_maxbytes); 1482 goto retry; 1483 } 1484 1485 to = ci->i_truncate_size; 1486 wrbuffer_refs = ci->i_wrbuffer_ref; 1487 dout("__do_pending_vmtruncate %p (%d) to %lld\n", inode, 1488 ci->i_truncate_pending, to); 1489 spin_unlock(&inode->i_lock); 1490 1491 truncate_inode_pages(inode->i_mapping, to); 1492 1493 spin_lock(&inode->i_lock); 1494 ci->i_truncate_pending--; 1495 if (ci->i_truncate_pending == 0) 1496 wake = 1; 1497 spin_unlock(&inode->i_lock); 1498 1499 if (wrbuffer_refs == 0) 1500 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL); 1501 if (wake) 1502 wake_up(&ci->i_cap_wq); 1503 } 1504 1505 1506 /* 1507 * symlinks 1508 */ 1509 static void *ceph_sym_follow_link(struct dentry *dentry, struct nameidata *nd) 1510 { 1511 struct ceph_inode_info *ci = ceph_inode(dentry->d_inode); 1512 nd_set_link(nd, ci->i_symlink); 1513 return NULL; 1514 } 1515 1516 static const struct inode_operations ceph_symlink_iops = { 1517 .readlink = generic_readlink, 1518 .follow_link = ceph_sym_follow_link, 1519 }; 1520 1521 /* 1522 * setattr 1523 */ 1524 int ceph_setattr(struct dentry *dentry, struct iattr *attr) 1525 { 1526 struct inode *inode = dentry->d_inode; 1527 struct ceph_inode_info *ci = ceph_inode(inode); 1528 struct inode *parent_inode = dentry->d_parent->d_inode; 1529 const unsigned int ia_valid = attr->ia_valid; 1530 struct ceph_mds_request *req; 1531 struct ceph_mds_client *mdsc = &ceph_sb_to_client(dentry->d_sb)->mdsc; 1532 int issued; 1533 int release = 0, dirtied = 0; 1534 int mask = 0; 1535 int err = 0; 1536 1537 if (ceph_snap(inode) != CEPH_NOSNAP) 1538 return -EROFS; 1539 1540 __ceph_do_pending_vmtruncate(inode); 1541 1542 err = inode_change_ok(inode, attr); 1543 if (err != 0) 1544 return err; 1545 1546 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETATTR, 1547 USE_AUTH_MDS); 1548 if (IS_ERR(req)) 1549 return PTR_ERR(req); 1550 1551 spin_lock(&inode->i_lock); 1552 issued = __ceph_caps_issued(ci, NULL); 1553 dout("setattr %p issued %s\n", inode, ceph_cap_string(issued)); 1554 1555 if (ia_valid & ATTR_UID) { 1556 dout("setattr %p uid %d -> %d\n", inode, 1557 inode->i_uid, attr->ia_uid); 1558 if (issued & CEPH_CAP_AUTH_EXCL) { 1559 inode->i_uid = attr->ia_uid; 1560 dirtied |= CEPH_CAP_AUTH_EXCL; 1561 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 || 1562 attr->ia_uid != inode->i_uid) { 1563 req->r_args.setattr.uid = cpu_to_le32(attr->ia_uid); 1564 mask |= CEPH_SETATTR_UID; 1565 release |= CEPH_CAP_AUTH_SHARED; 1566 } 1567 } 1568 if (ia_valid & ATTR_GID) { 1569 dout("setattr %p gid %d -> %d\n", inode, 1570 inode->i_gid, attr->ia_gid); 1571 if (issued & CEPH_CAP_AUTH_EXCL) { 1572 inode->i_gid = attr->ia_gid; 1573 dirtied |= CEPH_CAP_AUTH_EXCL; 1574 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 || 1575 attr->ia_gid != inode->i_gid) { 1576 req->r_args.setattr.gid = cpu_to_le32(attr->ia_gid); 1577 mask |= CEPH_SETATTR_GID; 1578 release |= CEPH_CAP_AUTH_SHARED; 1579 } 1580 } 1581 if (ia_valid & ATTR_MODE) { 1582 dout("setattr %p mode 0%o -> 0%o\n", inode, inode->i_mode, 1583 attr->ia_mode); 1584 if (issued & CEPH_CAP_AUTH_EXCL) { 1585 inode->i_mode = attr->ia_mode; 1586 dirtied |= CEPH_CAP_AUTH_EXCL; 1587 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 || 1588 attr->ia_mode != inode->i_mode) { 1589 req->r_args.setattr.mode = cpu_to_le32(attr->ia_mode); 1590 mask |= CEPH_SETATTR_MODE; 1591 release |= CEPH_CAP_AUTH_SHARED; 1592 } 1593 } 1594 1595 if (ia_valid & ATTR_ATIME) { 1596 dout("setattr %p atime %ld.%ld -> %ld.%ld\n", inode, 1597 inode->i_atime.tv_sec, inode->i_atime.tv_nsec, 1598 attr->ia_atime.tv_sec, attr->ia_atime.tv_nsec); 1599 if (issued & CEPH_CAP_FILE_EXCL) { 1600 ci->i_time_warp_seq++; 1601 inode->i_atime = attr->ia_atime; 1602 dirtied |= CEPH_CAP_FILE_EXCL; 1603 } else if ((issued & CEPH_CAP_FILE_WR) && 1604 timespec_compare(&inode->i_atime, 1605 &attr->ia_atime) < 0) { 1606 inode->i_atime = attr->ia_atime; 1607 dirtied |= CEPH_CAP_FILE_WR; 1608 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 || 1609 !timespec_equal(&inode->i_atime, &attr->ia_atime)) { 1610 ceph_encode_timespec(&req->r_args.setattr.atime, 1611 &attr->ia_atime); 1612 mask |= CEPH_SETATTR_ATIME; 1613 release |= CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_RD | 1614 CEPH_CAP_FILE_WR; 1615 } 1616 } 1617 if (ia_valid & ATTR_MTIME) { 1618 dout("setattr %p mtime %ld.%ld -> %ld.%ld\n", inode, 1619 inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec, 1620 attr->ia_mtime.tv_sec, attr->ia_mtime.tv_nsec); 1621 if (issued & CEPH_CAP_FILE_EXCL) { 1622 ci->i_time_warp_seq++; 1623 inode->i_mtime = attr->ia_mtime; 1624 dirtied |= CEPH_CAP_FILE_EXCL; 1625 } else if ((issued & CEPH_CAP_FILE_WR) && 1626 timespec_compare(&inode->i_mtime, 1627 &attr->ia_mtime) < 0) { 1628 inode->i_mtime = attr->ia_mtime; 1629 dirtied |= CEPH_CAP_FILE_WR; 1630 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 || 1631 !timespec_equal(&inode->i_mtime, &attr->ia_mtime)) { 1632 ceph_encode_timespec(&req->r_args.setattr.mtime, 1633 &attr->ia_mtime); 1634 mask |= CEPH_SETATTR_MTIME; 1635 release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD | 1636 CEPH_CAP_FILE_WR; 1637 } 1638 } 1639 if (ia_valid & ATTR_SIZE) { 1640 dout("setattr %p size %lld -> %lld\n", inode, 1641 inode->i_size, attr->ia_size); 1642 if (attr->ia_size > inode->i_sb->s_maxbytes) { 1643 err = -EINVAL; 1644 goto out; 1645 } 1646 if ((issued & CEPH_CAP_FILE_EXCL) && 1647 attr->ia_size > inode->i_size) { 1648 inode->i_size = attr->ia_size; 1649 inode->i_blocks = 1650 (attr->ia_size + (1 << 9) - 1) >> 9; 1651 inode->i_ctime = attr->ia_ctime; 1652 ci->i_reported_size = attr->ia_size; 1653 dirtied |= CEPH_CAP_FILE_EXCL; 1654 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 || 1655 attr->ia_size != inode->i_size) { 1656 req->r_args.setattr.size = cpu_to_le64(attr->ia_size); 1657 req->r_args.setattr.old_size = 1658 cpu_to_le64(inode->i_size); 1659 mask |= CEPH_SETATTR_SIZE; 1660 release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD | 1661 CEPH_CAP_FILE_WR; 1662 } 1663 } 1664 1665 /* these do nothing */ 1666 if (ia_valid & ATTR_CTIME) { 1667 bool only = (ia_valid & (ATTR_SIZE|ATTR_MTIME|ATTR_ATIME| 1668 ATTR_MODE|ATTR_UID|ATTR_GID)) == 0; 1669 dout("setattr %p ctime %ld.%ld -> %ld.%ld (%s)\n", inode, 1670 inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec, 1671 attr->ia_ctime.tv_sec, attr->ia_ctime.tv_nsec, 1672 only ? "ctime only" : "ignored"); 1673 inode->i_ctime = attr->ia_ctime; 1674 if (only) { 1675 /* 1676 * if kernel wants to dirty ctime but nothing else, 1677 * we need to choose a cap to dirty under, or do 1678 * a almost-no-op setattr 1679 */ 1680 if (issued & CEPH_CAP_AUTH_EXCL) 1681 dirtied |= CEPH_CAP_AUTH_EXCL; 1682 else if (issued & CEPH_CAP_FILE_EXCL) 1683 dirtied |= CEPH_CAP_FILE_EXCL; 1684 else if (issued & CEPH_CAP_XATTR_EXCL) 1685 dirtied |= CEPH_CAP_XATTR_EXCL; 1686 else 1687 mask |= CEPH_SETATTR_CTIME; 1688 } 1689 } 1690 if (ia_valid & ATTR_FILE) 1691 dout("setattr %p ATTR_FILE ... hrm!\n", inode); 1692 1693 if (dirtied) { 1694 __ceph_mark_dirty_caps(ci, dirtied); 1695 inode->i_ctime = CURRENT_TIME; 1696 } 1697 1698 release &= issued; 1699 spin_unlock(&inode->i_lock); 1700 1701 if (mask) { 1702 req->r_inode = igrab(inode); 1703 req->r_inode_drop = release; 1704 req->r_args.setattr.mask = cpu_to_le32(mask); 1705 req->r_num_caps = 1; 1706 err = ceph_mdsc_do_request(mdsc, parent_inode, req); 1707 } 1708 dout("setattr %p result=%d (%s locally, %d remote)\n", inode, err, 1709 ceph_cap_string(dirtied), mask); 1710 1711 ceph_mdsc_put_request(req); 1712 __ceph_do_pending_vmtruncate(inode); 1713 return err; 1714 out: 1715 spin_unlock(&inode->i_lock); 1716 ceph_mdsc_put_request(req); 1717 return err; 1718 } 1719 1720 /* 1721 * Verify that we have a lease on the given mask. If not, 1722 * do a getattr against an mds. 1723 */ 1724 int ceph_do_getattr(struct inode *inode, int mask) 1725 { 1726 struct ceph_client *client = ceph_sb_to_client(inode->i_sb); 1727 struct ceph_mds_client *mdsc = &client->mdsc; 1728 struct ceph_mds_request *req; 1729 int err; 1730 1731 if (ceph_snap(inode) == CEPH_SNAPDIR) { 1732 dout("do_getattr inode %p SNAPDIR\n", inode); 1733 return 0; 1734 } 1735 1736 dout("do_getattr inode %p mask %s\n", inode, ceph_cap_string(mask)); 1737 if (ceph_caps_issued_mask(ceph_inode(inode), mask, 1)) 1738 return 0; 1739 1740 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS); 1741 if (IS_ERR(req)) 1742 return PTR_ERR(req); 1743 req->r_inode = igrab(inode); 1744 req->r_num_caps = 1; 1745 req->r_args.getattr.mask = cpu_to_le32(mask); 1746 err = ceph_mdsc_do_request(mdsc, NULL, req); 1747 ceph_mdsc_put_request(req); 1748 dout("do_getattr result=%d\n", err); 1749 return err; 1750 } 1751 1752 1753 /* 1754 * Check inode permissions. We verify we have a valid value for 1755 * the AUTH cap, then call the generic handler. 1756 */ 1757 int ceph_permission(struct inode *inode, int mask) 1758 { 1759 int err = ceph_do_getattr(inode, CEPH_CAP_AUTH_SHARED); 1760 1761 if (!err) 1762 err = generic_permission(inode, mask, NULL); 1763 return err; 1764 } 1765 1766 /* 1767 * Get all attributes. Hopefully somedata we'll have a statlite() 1768 * and can limit the fields we require to be accurate. 1769 */ 1770 int ceph_getattr(struct vfsmount *mnt, struct dentry *dentry, 1771 struct kstat *stat) 1772 { 1773 struct inode *inode = dentry->d_inode; 1774 struct ceph_inode_info *ci = ceph_inode(inode); 1775 int err; 1776 1777 err = ceph_do_getattr(inode, CEPH_STAT_CAP_INODE_ALL); 1778 if (!err) { 1779 generic_fillattr(inode, stat); 1780 stat->ino = inode->i_ino; 1781 if (ceph_snap(inode) != CEPH_NOSNAP) 1782 stat->dev = ceph_snap(inode); 1783 else 1784 stat->dev = 0; 1785 if (S_ISDIR(inode->i_mode)) { 1786 stat->size = ci->i_rbytes; 1787 stat->blocks = 0; 1788 stat->blksize = 65536; 1789 } 1790 } 1791 return err; 1792 } 1793