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 (ci->i_ceph_flags & CEPH_I_COMPLETE) == 0) { 680 dout(" marking %p complete (empty)\n", inode); 681 ci->i_ceph_flags |= CEPH_I_COMPLETE; 682 ci->i_max_offset = 2; 683 } 684 685 /* it may be better to set st_size in getattr instead? */ 686 if (ceph_test_opt(ceph_sb_to_client(inode->i_sb), RBYTES)) 687 inode->i_size = ci->i_rbytes; 688 break; 689 default: 690 pr_err("fill_inode %llx.%llx BAD mode 0%o\n", 691 ceph_vinop(inode), inode->i_mode); 692 } 693 694 no_change: 695 spin_unlock(&inode->i_lock); 696 697 /* queue truncate if we saw i_size decrease */ 698 if (queue_trunc) 699 ceph_queue_vmtruncate(inode); 700 701 /* populate frag tree */ 702 /* FIXME: move me up, if/when version reflects fragtree changes */ 703 nsplits = le32_to_cpu(info->fragtree.nsplits); 704 mutex_lock(&ci->i_fragtree_mutex); 705 for (i = 0; i < nsplits; i++) { 706 u32 id = le32_to_cpu(info->fragtree.splits[i].frag); 707 struct ceph_inode_frag *frag = __get_or_create_frag(ci, id); 708 709 if (IS_ERR(frag)) 710 continue; 711 frag->split_by = le32_to_cpu(info->fragtree.splits[i].by); 712 dout(" frag %x split by %d\n", frag->frag, frag->split_by); 713 } 714 mutex_unlock(&ci->i_fragtree_mutex); 715 716 /* were we issued a capability? */ 717 if (info->cap.caps) { 718 if (ceph_snap(inode) == CEPH_NOSNAP) { 719 ceph_add_cap(inode, session, 720 le64_to_cpu(info->cap.cap_id), 721 cap_fmode, 722 le32_to_cpu(info->cap.caps), 723 le32_to_cpu(info->cap.wanted), 724 le32_to_cpu(info->cap.seq), 725 le32_to_cpu(info->cap.mseq), 726 le64_to_cpu(info->cap.realm), 727 info->cap.flags, 728 caps_reservation); 729 } else { 730 spin_lock(&inode->i_lock); 731 dout(" %p got snap_caps %s\n", inode, 732 ceph_cap_string(le32_to_cpu(info->cap.caps))); 733 ci->i_snap_caps |= le32_to_cpu(info->cap.caps); 734 if (cap_fmode >= 0) 735 __ceph_get_fmode(ci, cap_fmode); 736 spin_unlock(&inode->i_lock); 737 } 738 } else if (cap_fmode >= 0) { 739 pr_warning("mds issued no caps on %llx.%llx\n", 740 ceph_vinop(inode)); 741 __ceph_get_fmode(ci, cap_fmode); 742 } 743 744 /* update delegation info? */ 745 if (dirinfo) 746 ceph_fill_dirfrag(inode, dirinfo); 747 748 err = 0; 749 750 out: 751 if (xattr_blob) 752 ceph_buffer_put(xattr_blob); 753 return err; 754 } 755 756 /* 757 * caller should hold session s_mutex. 758 */ 759 static void update_dentry_lease(struct dentry *dentry, 760 struct ceph_mds_reply_lease *lease, 761 struct ceph_mds_session *session, 762 unsigned long from_time) 763 { 764 struct ceph_dentry_info *di = ceph_dentry(dentry); 765 long unsigned duration = le32_to_cpu(lease->duration_ms); 766 long unsigned ttl = from_time + (duration * HZ) / 1000; 767 long unsigned half_ttl = from_time + (duration * HZ / 2) / 1000; 768 struct inode *dir; 769 770 /* only track leases on regular dentries */ 771 if (dentry->d_op != &ceph_dentry_ops) 772 return; 773 774 spin_lock(&dentry->d_lock); 775 dout("update_dentry_lease %p mask %d duration %lu ms ttl %lu\n", 776 dentry, le16_to_cpu(lease->mask), duration, ttl); 777 778 /* make lease_rdcache_gen match directory */ 779 dir = dentry->d_parent->d_inode; 780 di->lease_shared_gen = ceph_inode(dir)->i_shared_gen; 781 782 if (lease->mask == 0) 783 goto out_unlock; 784 785 if (di->lease_gen == session->s_cap_gen && 786 time_before(ttl, dentry->d_time)) 787 goto out_unlock; /* we already have a newer lease. */ 788 789 if (di->lease_session && di->lease_session != session) 790 goto out_unlock; 791 792 ceph_dentry_lru_touch(dentry); 793 794 if (!di->lease_session) 795 di->lease_session = ceph_get_mds_session(session); 796 di->lease_gen = session->s_cap_gen; 797 di->lease_seq = le32_to_cpu(lease->seq); 798 di->lease_renew_after = half_ttl; 799 di->lease_renew_from = 0; 800 dentry->d_time = ttl; 801 out_unlock: 802 spin_unlock(&dentry->d_lock); 803 return; 804 } 805 806 /* 807 * Set dentry's directory position based on the current dir's max, and 808 * order it in d_subdirs, so that dcache_readdir behaves. 809 */ 810 static void ceph_set_dentry_offset(struct dentry *dn) 811 { 812 struct dentry *dir = dn->d_parent; 813 struct inode *inode = dn->d_parent->d_inode; 814 struct ceph_dentry_info *di; 815 816 BUG_ON(!inode); 817 818 di = ceph_dentry(dn); 819 820 spin_lock(&inode->i_lock); 821 if ((ceph_inode(inode)->i_ceph_flags & CEPH_I_COMPLETE) == 0) { 822 spin_unlock(&inode->i_lock); 823 return; 824 } 825 di->offset = ceph_inode(inode)->i_max_offset++; 826 spin_unlock(&inode->i_lock); 827 828 spin_lock(&dcache_lock); 829 spin_lock(&dn->d_lock); 830 list_move_tail(&dir->d_subdirs, &dn->d_u.d_child); 831 dout("set_dentry_offset %p %lld (%p %p)\n", dn, di->offset, 832 dn->d_u.d_child.prev, dn->d_u.d_child.next); 833 spin_unlock(&dn->d_lock); 834 spin_unlock(&dcache_lock); 835 } 836 837 /* 838 * splice a dentry to an inode. 839 * caller must hold directory i_mutex for this to be safe. 840 * 841 * we will only rehash the resulting dentry if @prehash is 842 * true; @prehash will be set to false (for the benefit of 843 * the caller) if we fail. 844 */ 845 static struct dentry *splice_dentry(struct dentry *dn, struct inode *in, 846 bool *prehash) 847 { 848 struct dentry *realdn; 849 850 BUG_ON(dn->d_inode); 851 852 /* dn must be unhashed */ 853 if (!d_unhashed(dn)) 854 d_drop(dn); 855 realdn = d_materialise_unique(dn, in); 856 if (IS_ERR(realdn)) { 857 pr_err("splice_dentry error %p inode %p ino %llx.%llx\n", 858 dn, in, ceph_vinop(in)); 859 if (prehash) 860 *prehash = false; /* don't rehash on error */ 861 dn = realdn; /* note realdn contains the error */ 862 goto out; 863 } else if (realdn) { 864 dout("dn %p (%d) spliced with %p (%d) " 865 "inode %p ino %llx.%llx\n", 866 dn, atomic_read(&dn->d_count), 867 realdn, atomic_read(&realdn->d_count), 868 realdn->d_inode, ceph_vinop(realdn->d_inode)); 869 dput(dn); 870 dn = realdn; 871 } else { 872 BUG_ON(!ceph_dentry(dn)); 873 dout("dn %p attached to %p ino %llx.%llx\n", 874 dn, dn->d_inode, ceph_vinop(dn->d_inode)); 875 } 876 if ((!prehash || *prehash) && d_unhashed(dn)) 877 d_rehash(dn); 878 ceph_set_dentry_offset(dn); 879 out: 880 return dn; 881 } 882 883 /* 884 * Incorporate results into the local cache. This is either just 885 * one inode, or a directory, dentry, and possibly linked-to inode (e.g., 886 * after a lookup). 887 * 888 * A reply may contain 889 * a directory inode along with a dentry. 890 * and/or a target inode 891 * 892 * Called with snap_rwsem (read). 893 */ 894 int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req, 895 struct ceph_mds_session *session) 896 { 897 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info; 898 struct inode *in = NULL; 899 struct ceph_mds_reply_inode *ininfo; 900 struct ceph_vino vino; 901 struct ceph_client *client = ceph_sb_to_client(sb); 902 int i = 0; 903 int err = 0; 904 905 dout("fill_trace %p is_dentry %d is_target %d\n", req, 906 rinfo->head->is_dentry, rinfo->head->is_target); 907 908 #if 0 909 /* 910 * Debugging hook: 911 * 912 * If we resend completed ops to a recovering mds, we get no 913 * trace. Since that is very rare, pretend this is the case 914 * to ensure the 'no trace' handlers in the callers behave. 915 * 916 * Fill in inodes unconditionally to avoid breaking cap 917 * invariants. 918 */ 919 if (rinfo->head->op & CEPH_MDS_OP_WRITE) { 920 pr_info("fill_trace faking empty trace on %lld %s\n", 921 req->r_tid, ceph_mds_op_name(rinfo->head->op)); 922 if (rinfo->head->is_dentry) { 923 rinfo->head->is_dentry = 0; 924 err = fill_inode(req->r_locked_dir, 925 &rinfo->diri, rinfo->dirfrag, 926 session, req->r_request_started, -1); 927 } 928 if (rinfo->head->is_target) { 929 rinfo->head->is_target = 0; 930 ininfo = rinfo->targeti.in; 931 vino.ino = le64_to_cpu(ininfo->ino); 932 vino.snap = le64_to_cpu(ininfo->snapid); 933 in = ceph_get_inode(sb, vino); 934 err = fill_inode(in, &rinfo->targeti, NULL, 935 session, req->r_request_started, 936 req->r_fmode); 937 iput(in); 938 } 939 } 940 #endif 941 942 if (!rinfo->head->is_target && !rinfo->head->is_dentry) { 943 dout("fill_trace reply is empty!\n"); 944 if (rinfo->head->result == 0 && req->r_locked_dir) 945 ceph_invalidate_dir_request(req); 946 return 0; 947 } 948 949 if (rinfo->head->is_dentry) { 950 struct inode *dir = req->r_locked_dir; 951 952 err = fill_inode(dir, &rinfo->diri, rinfo->dirfrag, 953 session, req->r_request_started, -1, 954 &req->r_caps_reservation); 955 if (err < 0) 956 return err; 957 } 958 959 /* 960 * ignore null lease/binding on snapdir ENOENT, or else we 961 * will have trouble splicing in the virtual snapdir later 962 */ 963 if (rinfo->head->is_dentry && !req->r_aborted && 964 (rinfo->head->is_target || strncmp(req->r_dentry->d_name.name, 965 client->mount_args->snapdir_name, 966 req->r_dentry->d_name.len))) { 967 /* 968 * lookup link rename : null -> possibly existing inode 969 * mknod symlink mkdir : null -> new inode 970 * unlink : linked -> null 971 */ 972 struct inode *dir = req->r_locked_dir; 973 struct dentry *dn = req->r_dentry; 974 bool have_dir_cap, have_lease; 975 976 BUG_ON(!dn); 977 BUG_ON(!dir); 978 BUG_ON(dn->d_parent->d_inode != dir); 979 BUG_ON(ceph_ino(dir) != 980 le64_to_cpu(rinfo->diri.in->ino)); 981 BUG_ON(ceph_snap(dir) != 982 le64_to_cpu(rinfo->diri.in->snapid)); 983 984 /* do we have a lease on the whole dir? */ 985 have_dir_cap = 986 (le32_to_cpu(rinfo->diri.in->cap.caps) & 987 CEPH_CAP_FILE_SHARED); 988 989 /* do we have a dn lease? */ 990 have_lease = have_dir_cap || 991 (le16_to_cpu(rinfo->dlease->mask) & 992 CEPH_LOCK_DN); 993 994 if (!have_lease) 995 dout("fill_trace no dentry lease or dir cap\n"); 996 997 /* rename? */ 998 if (req->r_old_dentry && req->r_op == CEPH_MDS_OP_RENAME) { 999 dout(" src %p '%.*s' dst %p '%.*s'\n", 1000 req->r_old_dentry, 1001 req->r_old_dentry->d_name.len, 1002 req->r_old_dentry->d_name.name, 1003 dn, dn->d_name.len, dn->d_name.name); 1004 dout("fill_trace doing d_move %p -> %p\n", 1005 req->r_old_dentry, dn); 1006 1007 /* d_move screws up d_subdirs order */ 1008 ceph_i_clear(dir, CEPH_I_COMPLETE); 1009 1010 d_move(req->r_old_dentry, dn); 1011 dout(" src %p '%.*s' dst %p '%.*s'\n", 1012 req->r_old_dentry, 1013 req->r_old_dentry->d_name.len, 1014 req->r_old_dentry->d_name.name, 1015 dn, dn->d_name.len, dn->d_name.name); 1016 1017 /* ensure target dentry is invalidated, despite 1018 rehashing bug in vfs_rename_dir */ 1019 ceph_invalidate_dentry_lease(dn); 1020 1021 /* take overwritten dentry's readdir offset */ 1022 dout("dn %p gets %p offset %lld (old offset %lld)\n", 1023 req->r_old_dentry, dn, ceph_dentry(dn)->offset, 1024 ceph_dentry(req->r_old_dentry)->offset); 1025 ceph_dentry(req->r_old_dentry)->offset = 1026 ceph_dentry(dn)->offset; 1027 1028 dn = req->r_old_dentry; /* use old_dentry */ 1029 in = dn->d_inode; 1030 } 1031 1032 /* null dentry? */ 1033 if (!rinfo->head->is_target) { 1034 dout("fill_trace null dentry\n"); 1035 if (dn->d_inode) { 1036 dout("d_delete %p\n", dn); 1037 d_delete(dn); 1038 } else { 1039 dout("d_instantiate %p NULL\n", dn); 1040 d_instantiate(dn, NULL); 1041 if (have_lease && d_unhashed(dn)) 1042 d_rehash(dn); 1043 update_dentry_lease(dn, rinfo->dlease, 1044 session, 1045 req->r_request_started); 1046 } 1047 goto done; 1048 } 1049 1050 /* attach proper inode */ 1051 ininfo = rinfo->targeti.in; 1052 vino.ino = le64_to_cpu(ininfo->ino); 1053 vino.snap = le64_to_cpu(ininfo->snapid); 1054 if (!dn->d_inode) { 1055 in = ceph_get_inode(sb, vino); 1056 if (IS_ERR(in)) { 1057 pr_err("fill_trace bad get_inode " 1058 "%llx.%llx\n", vino.ino, vino.snap); 1059 err = PTR_ERR(in); 1060 d_delete(dn); 1061 goto done; 1062 } 1063 dn = splice_dentry(dn, in, &have_lease); 1064 if (IS_ERR(dn)) { 1065 err = PTR_ERR(dn); 1066 goto done; 1067 } 1068 req->r_dentry = dn; /* may have spliced */ 1069 igrab(in); 1070 } else if (ceph_ino(in) == vino.ino && 1071 ceph_snap(in) == vino.snap) { 1072 igrab(in); 1073 } else { 1074 dout(" %p links to %p %llx.%llx, not %llx.%llx\n", 1075 dn, in, ceph_ino(in), ceph_snap(in), 1076 vino.ino, vino.snap); 1077 have_lease = false; 1078 in = NULL; 1079 } 1080 1081 if (have_lease) 1082 update_dentry_lease(dn, rinfo->dlease, session, 1083 req->r_request_started); 1084 dout(" final dn %p\n", dn); 1085 i++; 1086 } else if (req->r_op == CEPH_MDS_OP_LOOKUPSNAP || 1087 req->r_op == CEPH_MDS_OP_MKSNAP) { 1088 struct dentry *dn = req->r_dentry; 1089 1090 /* fill out a snapdir LOOKUPSNAP dentry */ 1091 BUG_ON(!dn); 1092 BUG_ON(!req->r_locked_dir); 1093 BUG_ON(ceph_snap(req->r_locked_dir) != CEPH_SNAPDIR); 1094 ininfo = rinfo->targeti.in; 1095 vino.ino = le64_to_cpu(ininfo->ino); 1096 vino.snap = le64_to_cpu(ininfo->snapid); 1097 in = ceph_get_inode(sb, vino); 1098 if (IS_ERR(in)) { 1099 pr_err("fill_inode get_inode badness %llx.%llx\n", 1100 vino.ino, vino.snap); 1101 err = PTR_ERR(in); 1102 d_delete(dn); 1103 goto done; 1104 } 1105 dout(" linking snapped dir %p to dn %p\n", in, dn); 1106 dn = splice_dentry(dn, in, NULL); 1107 if (IS_ERR(dn)) { 1108 err = PTR_ERR(dn); 1109 goto done; 1110 } 1111 req->r_dentry = dn; /* may have spliced */ 1112 igrab(in); 1113 rinfo->head->is_dentry = 1; /* fool notrace handlers */ 1114 } 1115 1116 if (rinfo->head->is_target) { 1117 vino.ino = le64_to_cpu(rinfo->targeti.in->ino); 1118 vino.snap = le64_to_cpu(rinfo->targeti.in->snapid); 1119 1120 if (in == NULL || ceph_ino(in) != vino.ino || 1121 ceph_snap(in) != vino.snap) { 1122 in = ceph_get_inode(sb, vino); 1123 if (IS_ERR(in)) { 1124 err = PTR_ERR(in); 1125 goto done; 1126 } 1127 } 1128 req->r_target_inode = in; 1129 1130 err = fill_inode(in, 1131 &rinfo->targeti, NULL, 1132 session, req->r_request_started, 1133 (le32_to_cpu(rinfo->head->result) == 0) ? 1134 req->r_fmode : -1, 1135 &req->r_caps_reservation); 1136 if (err < 0) { 1137 pr_err("fill_inode badness %p %llx.%llx\n", 1138 in, ceph_vinop(in)); 1139 goto done; 1140 } 1141 } 1142 1143 done: 1144 dout("fill_trace done err=%d\n", err); 1145 return err; 1146 } 1147 1148 /* 1149 * Prepopulate our cache with readdir results, leases, etc. 1150 */ 1151 int ceph_readdir_prepopulate(struct ceph_mds_request *req, 1152 struct ceph_mds_session *session) 1153 { 1154 struct dentry *parent = req->r_dentry; 1155 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info; 1156 struct qstr dname; 1157 struct dentry *dn; 1158 struct inode *in; 1159 int err = 0, i; 1160 struct inode *snapdir = NULL; 1161 struct ceph_mds_request_head *rhead = req->r_request->front.iov_base; 1162 u64 frag = le32_to_cpu(rhead->args.readdir.frag); 1163 struct ceph_dentry_info *di; 1164 1165 if (le32_to_cpu(rinfo->head->op) == CEPH_MDS_OP_LSSNAP) { 1166 snapdir = ceph_get_snapdir(parent->d_inode); 1167 parent = d_find_alias(snapdir); 1168 dout("readdir_prepopulate %d items under SNAPDIR dn %p\n", 1169 rinfo->dir_nr, parent); 1170 } else { 1171 dout("readdir_prepopulate %d items under dn %p\n", 1172 rinfo->dir_nr, parent); 1173 if (rinfo->dir_dir) 1174 ceph_fill_dirfrag(parent->d_inode, rinfo->dir_dir); 1175 } 1176 1177 for (i = 0; i < rinfo->dir_nr; i++) { 1178 struct ceph_vino vino; 1179 1180 dname.name = rinfo->dir_dname[i]; 1181 dname.len = rinfo->dir_dname_len[i]; 1182 dname.hash = full_name_hash(dname.name, dname.len); 1183 1184 vino.ino = le64_to_cpu(rinfo->dir_in[i].in->ino); 1185 vino.snap = le64_to_cpu(rinfo->dir_in[i].in->snapid); 1186 1187 retry_lookup: 1188 dn = d_lookup(parent, &dname); 1189 dout("d_lookup on parent=%p name=%.*s got %p\n", 1190 parent, dname.len, dname.name, dn); 1191 1192 if (!dn) { 1193 dn = d_alloc(parent, &dname); 1194 dout("d_alloc %p '%.*s' = %p\n", parent, 1195 dname.len, dname.name, dn); 1196 if (dn == NULL) { 1197 dout("d_alloc badness\n"); 1198 err = -ENOMEM; 1199 goto out; 1200 } 1201 err = ceph_init_dentry(dn); 1202 if (err < 0) 1203 goto out; 1204 } else if (dn->d_inode && 1205 (ceph_ino(dn->d_inode) != vino.ino || 1206 ceph_snap(dn->d_inode) != vino.snap)) { 1207 dout(" dn %p points to wrong inode %p\n", 1208 dn, dn->d_inode); 1209 d_delete(dn); 1210 dput(dn); 1211 goto retry_lookup; 1212 } else { 1213 /* reorder parent's d_subdirs */ 1214 spin_lock(&dcache_lock); 1215 spin_lock(&dn->d_lock); 1216 list_move(&dn->d_u.d_child, &parent->d_subdirs); 1217 spin_unlock(&dn->d_lock); 1218 spin_unlock(&dcache_lock); 1219 } 1220 1221 di = dn->d_fsdata; 1222 di->offset = ceph_make_fpos(frag, i + req->r_readdir_offset); 1223 1224 /* inode */ 1225 if (dn->d_inode) { 1226 in = dn->d_inode; 1227 } else { 1228 in = ceph_get_inode(parent->d_sb, vino); 1229 if (in == NULL) { 1230 dout("new_inode badness\n"); 1231 d_delete(dn); 1232 dput(dn); 1233 err = -ENOMEM; 1234 goto out; 1235 } 1236 dn = splice_dentry(dn, in, NULL); 1237 } 1238 1239 if (fill_inode(in, &rinfo->dir_in[i], NULL, session, 1240 req->r_request_started, -1, 1241 &req->r_caps_reservation) < 0) { 1242 pr_err("fill_inode badness on %p\n", in); 1243 dput(dn); 1244 continue; 1245 } 1246 update_dentry_lease(dn, rinfo->dir_dlease[i], 1247 req->r_session, req->r_request_started); 1248 dput(dn); 1249 } 1250 req->r_did_prepopulate = true; 1251 1252 out: 1253 if (snapdir) { 1254 iput(snapdir); 1255 dput(parent); 1256 } 1257 dout("readdir_prepopulate done\n"); 1258 return err; 1259 } 1260 1261 int ceph_inode_set_size(struct inode *inode, loff_t size) 1262 { 1263 struct ceph_inode_info *ci = ceph_inode(inode); 1264 int ret = 0; 1265 1266 spin_lock(&inode->i_lock); 1267 dout("set_size %p %llu -> %llu\n", inode, inode->i_size, size); 1268 inode->i_size = size; 1269 inode->i_blocks = (size + (1 << 9) - 1) >> 9; 1270 1271 /* tell the MDS if we are approaching max_size */ 1272 if ((size << 1) >= ci->i_max_size && 1273 (ci->i_reported_size << 1) < ci->i_max_size) 1274 ret = 1; 1275 1276 spin_unlock(&inode->i_lock); 1277 return ret; 1278 } 1279 1280 /* 1281 * Write back inode data in a worker thread. (This can't be done 1282 * in the message handler context.) 1283 */ 1284 void ceph_queue_writeback(struct inode *inode) 1285 { 1286 if (queue_work(ceph_inode_to_client(inode)->wb_wq, 1287 &ceph_inode(inode)->i_wb_work)) { 1288 dout("ceph_queue_writeback %p\n", inode); 1289 igrab(inode); 1290 } else { 1291 dout("ceph_queue_writeback %p failed\n", inode); 1292 } 1293 } 1294 1295 static void ceph_writeback_work(struct work_struct *work) 1296 { 1297 struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info, 1298 i_wb_work); 1299 struct inode *inode = &ci->vfs_inode; 1300 1301 dout("writeback %p\n", inode); 1302 filemap_fdatawrite(&inode->i_data); 1303 iput(inode); 1304 } 1305 1306 /* 1307 * queue an async invalidation 1308 */ 1309 void ceph_queue_invalidate(struct inode *inode) 1310 { 1311 if (queue_work(ceph_inode_to_client(inode)->pg_inv_wq, 1312 &ceph_inode(inode)->i_pg_inv_work)) { 1313 dout("ceph_queue_invalidate %p\n", inode); 1314 igrab(inode); 1315 } else { 1316 dout("ceph_queue_invalidate %p failed\n", inode); 1317 } 1318 } 1319 1320 /* 1321 * invalidate any pages that are not dirty or under writeback. this 1322 * includes pages that are clean and mapped. 1323 */ 1324 static void ceph_invalidate_nondirty_pages(struct address_space *mapping) 1325 { 1326 struct pagevec pvec; 1327 pgoff_t next = 0; 1328 int i; 1329 1330 pagevec_init(&pvec, 0); 1331 while (pagevec_lookup(&pvec, mapping, next, PAGEVEC_SIZE)) { 1332 for (i = 0; i < pagevec_count(&pvec); i++) { 1333 struct page *page = pvec.pages[i]; 1334 pgoff_t index; 1335 int skip_page = 1336 (PageDirty(page) || PageWriteback(page)); 1337 1338 if (!skip_page) 1339 skip_page = !trylock_page(page); 1340 1341 /* 1342 * We really shouldn't be looking at the ->index of an 1343 * unlocked page. But we're not allowed to lock these 1344 * pages. So we rely upon nobody altering the ->index 1345 * of this (pinned-by-us) page. 1346 */ 1347 index = page->index; 1348 if (index > next) 1349 next = index; 1350 next++; 1351 1352 if (skip_page) 1353 continue; 1354 1355 generic_error_remove_page(mapping, page); 1356 unlock_page(page); 1357 } 1358 pagevec_release(&pvec); 1359 cond_resched(); 1360 } 1361 } 1362 1363 /* 1364 * Invalidate inode pages in a worker thread. (This can't be done 1365 * in the message handler context.) 1366 */ 1367 static void ceph_invalidate_work(struct work_struct *work) 1368 { 1369 struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info, 1370 i_pg_inv_work); 1371 struct inode *inode = &ci->vfs_inode; 1372 u32 orig_gen; 1373 int check = 0; 1374 1375 spin_lock(&inode->i_lock); 1376 dout("invalidate_pages %p gen %d revoking %d\n", inode, 1377 ci->i_rdcache_gen, ci->i_rdcache_revoking); 1378 if (ci->i_rdcache_gen == 0 || 1379 ci->i_rdcache_revoking != ci->i_rdcache_gen) { 1380 BUG_ON(ci->i_rdcache_revoking > ci->i_rdcache_gen); 1381 /* nevermind! */ 1382 ci->i_rdcache_revoking = 0; 1383 spin_unlock(&inode->i_lock); 1384 goto out; 1385 } 1386 orig_gen = ci->i_rdcache_gen; 1387 spin_unlock(&inode->i_lock); 1388 1389 ceph_invalidate_nondirty_pages(inode->i_mapping); 1390 1391 spin_lock(&inode->i_lock); 1392 if (orig_gen == ci->i_rdcache_gen) { 1393 dout("invalidate_pages %p gen %d successful\n", inode, 1394 ci->i_rdcache_gen); 1395 ci->i_rdcache_gen = 0; 1396 ci->i_rdcache_revoking = 0; 1397 check = 1; 1398 } else { 1399 dout("invalidate_pages %p gen %d raced, gen now %d\n", 1400 inode, orig_gen, ci->i_rdcache_gen); 1401 } 1402 spin_unlock(&inode->i_lock); 1403 1404 if (check) 1405 ceph_check_caps(ci, 0, NULL); 1406 out: 1407 iput(inode); 1408 } 1409 1410 1411 /* 1412 * called by trunc_wq; take i_mutex ourselves 1413 * 1414 * We also truncate in a separate thread as well. 1415 */ 1416 static void ceph_vmtruncate_work(struct work_struct *work) 1417 { 1418 struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info, 1419 i_vmtruncate_work); 1420 struct inode *inode = &ci->vfs_inode; 1421 1422 dout("vmtruncate_work %p\n", inode); 1423 mutex_lock(&inode->i_mutex); 1424 __ceph_do_pending_vmtruncate(inode); 1425 mutex_unlock(&inode->i_mutex); 1426 iput(inode); 1427 } 1428 1429 /* 1430 * Queue an async vmtruncate. If we fail to queue work, we will handle 1431 * the truncation the next time we call __ceph_do_pending_vmtruncate. 1432 */ 1433 void ceph_queue_vmtruncate(struct inode *inode) 1434 { 1435 struct ceph_inode_info *ci = ceph_inode(inode); 1436 1437 if (queue_work(ceph_sb_to_client(inode->i_sb)->trunc_wq, 1438 &ci->i_vmtruncate_work)) { 1439 dout("ceph_queue_vmtruncate %p\n", inode); 1440 igrab(inode); 1441 } else { 1442 dout("ceph_queue_vmtruncate %p failed, pending=%d\n", 1443 inode, ci->i_truncate_pending); 1444 } 1445 } 1446 1447 /* 1448 * called with i_mutex held. 1449 * 1450 * Make sure any pending truncation is applied before doing anything 1451 * that may depend on it. 1452 */ 1453 void __ceph_do_pending_vmtruncate(struct inode *inode) 1454 { 1455 struct ceph_inode_info *ci = ceph_inode(inode); 1456 u64 to; 1457 int wrbuffer_refs, wake = 0; 1458 1459 retry: 1460 spin_lock(&inode->i_lock); 1461 if (ci->i_truncate_pending == 0) { 1462 dout("__do_pending_vmtruncate %p none pending\n", inode); 1463 spin_unlock(&inode->i_lock); 1464 return; 1465 } 1466 1467 /* 1468 * make sure any dirty snapped pages are flushed before we 1469 * possibly truncate them.. so write AND block! 1470 */ 1471 if (ci->i_wrbuffer_ref_head < ci->i_wrbuffer_ref) { 1472 dout("__do_pending_vmtruncate %p flushing snaps first\n", 1473 inode); 1474 spin_unlock(&inode->i_lock); 1475 filemap_write_and_wait_range(&inode->i_data, 0, 1476 inode->i_sb->s_maxbytes); 1477 goto retry; 1478 } 1479 1480 to = ci->i_truncate_size; 1481 wrbuffer_refs = ci->i_wrbuffer_ref; 1482 dout("__do_pending_vmtruncate %p (%d) to %lld\n", inode, 1483 ci->i_truncate_pending, to); 1484 spin_unlock(&inode->i_lock); 1485 1486 truncate_inode_pages(inode->i_mapping, to); 1487 1488 spin_lock(&inode->i_lock); 1489 ci->i_truncate_pending--; 1490 if (ci->i_truncate_pending == 0) 1491 wake = 1; 1492 spin_unlock(&inode->i_lock); 1493 1494 if (wrbuffer_refs == 0) 1495 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL); 1496 if (wake) 1497 wake_up(&ci->i_cap_wq); 1498 } 1499 1500 1501 /* 1502 * symlinks 1503 */ 1504 static void *ceph_sym_follow_link(struct dentry *dentry, struct nameidata *nd) 1505 { 1506 struct ceph_inode_info *ci = ceph_inode(dentry->d_inode); 1507 nd_set_link(nd, ci->i_symlink); 1508 return NULL; 1509 } 1510 1511 static const struct inode_operations ceph_symlink_iops = { 1512 .readlink = generic_readlink, 1513 .follow_link = ceph_sym_follow_link, 1514 }; 1515 1516 /* 1517 * setattr 1518 */ 1519 int ceph_setattr(struct dentry *dentry, struct iattr *attr) 1520 { 1521 struct inode *inode = dentry->d_inode; 1522 struct ceph_inode_info *ci = ceph_inode(inode); 1523 struct inode *parent_inode = dentry->d_parent->d_inode; 1524 const unsigned int ia_valid = attr->ia_valid; 1525 struct ceph_mds_request *req; 1526 struct ceph_mds_client *mdsc = &ceph_sb_to_client(dentry->d_sb)->mdsc; 1527 int issued; 1528 int release = 0, dirtied = 0; 1529 int mask = 0; 1530 int err = 0; 1531 1532 if (ceph_snap(inode) != CEPH_NOSNAP) 1533 return -EROFS; 1534 1535 __ceph_do_pending_vmtruncate(inode); 1536 1537 err = inode_change_ok(inode, attr); 1538 if (err != 0) 1539 return err; 1540 1541 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETATTR, 1542 USE_AUTH_MDS); 1543 if (IS_ERR(req)) 1544 return PTR_ERR(req); 1545 1546 spin_lock(&inode->i_lock); 1547 issued = __ceph_caps_issued(ci, NULL); 1548 dout("setattr %p issued %s\n", inode, ceph_cap_string(issued)); 1549 1550 if (ia_valid & ATTR_UID) { 1551 dout("setattr %p uid %d -> %d\n", inode, 1552 inode->i_uid, attr->ia_uid); 1553 if (issued & CEPH_CAP_AUTH_EXCL) { 1554 inode->i_uid = attr->ia_uid; 1555 dirtied |= CEPH_CAP_AUTH_EXCL; 1556 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 || 1557 attr->ia_uid != inode->i_uid) { 1558 req->r_args.setattr.uid = cpu_to_le32(attr->ia_uid); 1559 mask |= CEPH_SETATTR_UID; 1560 release |= CEPH_CAP_AUTH_SHARED; 1561 } 1562 } 1563 if (ia_valid & ATTR_GID) { 1564 dout("setattr %p gid %d -> %d\n", inode, 1565 inode->i_gid, attr->ia_gid); 1566 if (issued & CEPH_CAP_AUTH_EXCL) { 1567 inode->i_gid = attr->ia_gid; 1568 dirtied |= CEPH_CAP_AUTH_EXCL; 1569 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 || 1570 attr->ia_gid != inode->i_gid) { 1571 req->r_args.setattr.gid = cpu_to_le32(attr->ia_gid); 1572 mask |= CEPH_SETATTR_GID; 1573 release |= CEPH_CAP_AUTH_SHARED; 1574 } 1575 } 1576 if (ia_valid & ATTR_MODE) { 1577 dout("setattr %p mode 0%o -> 0%o\n", inode, inode->i_mode, 1578 attr->ia_mode); 1579 if (issued & CEPH_CAP_AUTH_EXCL) { 1580 inode->i_mode = attr->ia_mode; 1581 dirtied |= CEPH_CAP_AUTH_EXCL; 1582 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 || 1583 attr->ia_mode != inode->i_mode) { 1584 req->r_args.setattr.mode = cpu_to_le32(attr->ia_mode); 1585 mask |= CEPH_SETATTR_MODE; 1586 release |= CEPH_CAP_AUTH_SHARED; 1587 } 1588 } 1589 1590 if (ia_valid & ATTR_ATIME) { 1591 dout("setattr %p atime %ld.%ld -> %ld.%ld\n", inode, 1592 inode->i_atime.tv_sec, inode->i_atime.tv_nsec, 1593 attr->ia_atime.tv_sec, attr->ia_atime.tv_nsec); 1594 if (issued & CEPH_CAP_FILE_EXCL) { 1595 ci->i_time_warp_seq++; 1596 inode->i_atime = attr->ia_atime; 1597 dirtied |= CEPH_CAP_FILE_EXCL; 1598 } else if ((issued & CEPH_CAP_FILE_WR) && 1599 timespec_compare(&inode->i_atime, 1600 &attr->ia_atime) < 0) { 1601 inode->i_atime = attr->ia_atime; 1602 dirtied |= CEPH_CAP_FILE_WR; 1603 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 || 1604 !timespec_equal(&inode->i_atime, &attr->ia_atime)) { 1605 ceph_encode_timespec(&req->r_args.setattr.atime, 1606 &attr->ia_atime); 1607 mask |= CEPH_SETATTR_ATIME; 1608 release |= CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_RD | 1609 CEPH_CAP_FILE_WR; 1610 } 1611 } 1612 if (ia_valid & ATTR_MTIME) { 1613 dout("setattr %p mtime %ld.%ld -> %ld.%ld\n", inode, 1614 inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec, 1615 attr->ia_mtime.tv_sec, attr->ia_mtime.tv_nsec); 1616 if (issued & CEPH_CAP_FILE_EXCL) { 1617 ci->i_time_warp_seq++; 1618 inode->i_mtime = attr->ia_mtime; 1619 dirtied |= CEPH_CAP_FILE_EXCL; 1620 } else if ((issued & CEPH_CAP_FILE_WR) && 1621 timespec_compare(&inode->i_mtime, 1622 &attr->ia_mtime) < 0) { 1623 inode->i_mtime = attr->ia_mtime; 1624 dirtied |= CEPH_CAP_FILE_WR; 1625 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 || 1626 !timespec_equal(&inode->i_mtime, &attr->ia_mtime)) { 1627 ceph_encode_timespec(&req->r_args.setattr.mtime, 1628 &attr->ia_mtime); 1629 mask |= CEPH_SETATTR_MTIME; 1630 release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD | 1631 CEPH_CAP_FILE_WR; 1632 } 1633 } 1634 if (ia_valid & ATTR_SIZE) { 1635 dout("setattr %p size %lld -> %lld\n", inode, 1636 inode->i_size, attr->ia_size); 1637 if (attr->ia_size > inode->i_sb->s_maxbytes) { 1638 err = -EINVAL; 1639 goto out; 1640 } 1641 if ((issued & CEPH_CAP_FILE_EXCL) && 1642 attr->ia_size > inode->i_size) { 1643 inode->i_size = attr->ia_size; 1644 inode->i_blocks = 1645 (attr->ia_size + (1 << 9) - 1) >> 9; 1646 inode->i_ctime = attr->ia_ctime; 1647 ci->i_reported_size = attr->ia_size; 1648 dirtied |= CEPH_CAP_FILE_EXCL; 1649 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 || 1650 attr->ia_size != inode->i_size) { 1651 req->r_args.setattr.size = cpu_to_le64(attr->ia_size); 1652 req->r_args.setattr.old_size = 1653 cpu_to_le64(inode->i_size); 1654 mask |= CEPH_SETATTR_SIZE; 1655 release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD | 1656 CEPH_CAP_FILE_WR; 1657 } 1658 } 1659 1660 /* these do nothing */ 1661 if (ia_valid & ATTR_CTIME) { 1662 bool only = (ia_valid & (ATTR_SIZE|ATTR_MTIME|ATTR_ATIME| 1663 ATTR_MODE|ATTR_UID|ATTR_GID)) == 0; 1664 dout("setattr %p ctime %ld.%ld -> %ld.%ld (%s)\n", inode, 1665 inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec, 1666 attr->ia_ctime.tv_sec, attr->ia_ctime.tv_nsec, 1667 only ? "ctime only" : "ignored"); 1668 inode->i_ctime = attr->ia_ctime; 1669 if (only) { 1670 /* 1671 * if kernel wants to dirty ctime but nothing else, 1672 * we need to choose a cap to dirty under, or do 1673 * a almost-no-op setattr 1674 */ 1675 if (issued & CEPH_CAP_AUTH_EXCL) 1676 dirtied |= CEPH_CAP_AUTH_EXCL; 1677 else if (issued & CEPH_CAP_FILE_EXCL) 1678 dirtied |= CEPH_CAP_FILE_EXCL; 1679 else if (issued & CEPH_CAP_XATTR_EXCL) 1680 dirtied |= CEPH_CAP_XATTR_EXCL; 1681 else 1682 mask |= CEPH_SETATTR_CTIME; 1683 } 1684 } 1685 if (ia_valid & ATTR_FILE) 1686 dout("setattr %p ATTR_FILE ... hrm!\n", inode); 1687 1688 if (dirtied) { 1689 __ceph_mark_dirty_caps(ci, dirtied); 1690 inode->i_ctime = CURRENT_TIME; 1691 } 1692 1693 release &= issued; 1694 spin_unlock(&inode->i_lock); 1695 1696 if (mask) { 1697 req->r_inode = igrab(inode); 1698 req->r_inode_drop = release; 1699 req->r_args.setattr.mask = cpu_to_le32(mask); 1700 req->r_num_caps = 1; 1701 err = ceph_mdsc_do_request(mdsc, parent_inode, req); 1702 } 1703 dout("setattr %p result=%d (%s locally, %d remote)\n", inode, err, 1704 ceph_cap_string(dirtied), mask); 1705 1706 ceph_mdsc_put_request(req); 1707 __ceph_do_pending_vmtruncate(inode); 1708 return err; 1709 out: 1710 spin_unlock(&inode->i_lock); 1711 ceph_mdsc_put_request(req); 1712 return err; 1713 } 1714 1715 /* 1716 * Verify that we have a lease on the given mask. If not, 1717 * do a getattr against an mds. 1718 */ 1719 int ceph_do_getattr(struct inode *inode, int mask) 1720 { 1721 struct ceph_client *client = ceph_sb_to_client(inode->i_sb); 1722 struct ceph_mds_client *mdsc = &client->mdsc; 1723 struct ceph_mds_request *req; 1724 int err; 1725 1726 if (ceph_snap(inode) == CEPH_SNAPDIR) { 1727 dout("do_getattr inode %p SNAPDIR\n", inode); 1728 return 0; 1729 } 1730 1731 dout("do_getattr inode %p mask %s\n", inode, ceph_cap_string(mask)); 1732 if (ceph_caps_issued_mask(ceph_inode(inode), mask, 1)) 1733 return 0; 1734 1735 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS); 1736 if (IS_ERR(req)) 1737 return PTR_ERR(req); 1738 req->r_inode = igrab(inode); 1739 req->r_num_caps = 1; 1740 req->r_args.getattr.mask = cpu_to_le32(mask); 1741 err = ceph_mdsc_do_request(mdsc, NULL, req); 1742 ceph_mdsc_put_request(req); 1743 dout("do_getattr result=%d\n", err); 1744 return err; 1745 } 1746 1747 1748 /* 1749 * Check inode permissions. We verify we have a valid value for 1750 * the AUTH cap, then call the generic handler. 1751 */ 1752 int ceph_permission(struct inode *inode, int mask) 1753 { 1754 int err = ceph_do_getattr(inode, CEPH_CAP_AUTH_SHARED); 1755 1756 if (!err) 1757 err = generic_permission(inode, mask, NULL); 1758 return err; 1759 } 1760 1761 /* 1762 * Get all attributes. Hopefully somedata we'll have a statlite() 1763 * and can limit the fields we require to be accurate. 1764 */ 1765 int ceph_getattr(struct vfsmount *mnt, struct dentry *dentry, 1766 struct kstat *stat) 1767 { 1768 struct inode *inode = dentry->d_inode; 1769 struct ceph_inode_info *ci = ceph_inode(inode); 1770 int err; 1771 1772 err = ceph_do_getattr(inode, CEPH_STAT_CAP_INODE_ALL); 1773 if (!err) { 1774 generic_fillattr(inode, stat); 1775 stat->ino = inode->i_ino; 1776 if (ceph_snap(inode) != CEPH_NOSNAP) 1777 stat->dev = ceph_snap(inode); 1778 else 1779 stat->dev = 0; 1780 if (S_ISDIR(inode->i_mode)) { 1781 stat->size = ci->i_rbytes; 1782 stat->blocks = 0; 1783 stat->blksize = 65536; 1784 } 1785 } 1786 return err; 1787 } 1788