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_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 } 623 624 inode->i_mapping->a_ops = &ceph_aops; 625 inode->i_mapping->backing_dev_info = 626 &ceph_client(inode->i_sb)->backing_dev_info; 627 628 switch (inode->i_mode & S_IFMT) { 629 case S_IFIFO: 630 case S_IFBLK: 631 case S_IFCHR: 632 case S_IFSOCK: 633 init_special_inode(inode, inode->i_mode, inode->i_rdev); 634 inode->i_op = &ceph_file_iops; 635 break; 636 case S_IFREG: 637 inode->i_op = &ceph_file_iops; 638 inode->i_fop = &ceph_file_fops; 639 break; 640 case S_IFLNK: 641 inode->i_op = &ceph_symlink_iops; 642 if (!ci->i_symlink) { 643 int symlen = iinfo->symlink_len; 644 char *sym; 645 646 BUG_ON(symlen != inode->i_size); 647 spin_unlock(&inode->i_lock); 648 649 err = -ENOMEM; 650 sym = kmalloc(symlen+1, GFP_NOFS); 651 if (!sym) 652 goto out; 653 memcpy(sym, iinfo->symlink, symlen); 654 sym[symlen] = 0; 655 656 spin_lock(&inode->i_lock); 657 if (!ci->i_symlink) 658 ci->i_symlink = sym; 659 else 660 kfree(sym); /* lost a race */ 661 } 662 break; 663 case S_IFDIR: 664 inode->i_op = &ceph_dir_iops; 665 inode->i_fop = &ceph_dir_fops; 666 667 ci->i_files = le64_to_cpu(info->files); 668 ci->i_subdirs = le64_to_cpu(info->subdirs); 669 ci->i_rbytes = le64_to_cpu(info->rbytes); 670 ci->i_rfiles = le64_to_cpu(info->rfiles); 671 ci->i_rsubdirs = le64_to_cpu(info->rsubdirs); 672 ceph_decode_timespec(&ci->i_rctime, &info->rctime); 673 674 /* set dir completion flag? */ 675 if (ci->i_files == 0 && ci->i_subdirs == 0 && 676 ceph_snap(inode) == CEPH_NOSNAP && 677 (le32_to_cpu(info->cap.caps) & CEPH_CAP_FILE_SHARED)) { 678 dout(" marking %p complete (empty)\n", inode); 679 ci->i_ceph_flags |= CEPH_I_COMPLETE; 680 ci->i_max_offset = 2; 681 } 682 683 /* it may be better to set st_size in getattr instead? */ 684 if (ceph_test_opt(ceph_client(inode->i_sb), RBYTES)) 685 inode->i_size = ci->i_rbytes; 686 break; 687 default: 688 pr_err("fill_inode %llx.%llx BAD mode 0%o\n", 689 ceph_vinop(inode), inode->i_mode); 690 } 691 692 no_change: 693 spin_unlock(&inode->i_lock); 694 695 /* queue truncate if we saw i_size decrease */ 696 if (queue_trunc) 697 ceph_queue_vmtruncate(inode); 698 699 /* populate frag tree */ 700 /* FIXME: move me up, if/when version reflects fragtree changes */ 701 nsplits = le32_to_cpu(info->fragtree.nsplits); 702 mutex_lock(&ci->i_fragtree_mutex); 703 for (i = 0; i < nsplits; i++) { 704 u32 id = le32_to_cpu(info->fragtree.splits[i].frag); 705 struct ceph_inode_frag *frag = __get_or_create_frag(ci, id); 706 707 if (IS_ERR(frag)) 708 continue; 709 frag->split_by = le32_to_cpu(info->fragtree.splits[i].by); 710 dout(" frag %x split by %d\n", frag->frag, frag->split_by); 711 } 712 mutex_unlock(&ci->i_fragtree_mutex); 713 714 /* were we issued a capability? */ 715 if (info->cap.caps) { 716 if (ceph_snap(inode) == CEPH_NOSNAP) { 717 ceph_add_cap(inode, session, 718 le64_to_cpu(info->cap.cap_id), 719 cap_fmode, 720 le32_to_cpu(info->cap.caps), 721 le32_to_cpu(info->cap.wanted), 722 le32_to_cpu(info->cap.seq), 723 le32_to_cpu(info->cap.mseq), 724 le64_to_cpu(info->cap.realm), 725 info->cap.flags, 726 caps_reservation); 727 } else { 728 spin_lock(&inode->i_lock); 729 dout(" %p got snap_caps %s\n", inode, 730 ceph_cap_string(le32_to_cpu(info->cap.caps))); 731 ci->i_snap_caps |= le32_to_cpu(info->cap.caps); 732 if (cap_fmode >= 0) 733 __ceph_get_fmode(ci, cap_fmode); 734 spin_unlock(&inode->i_lock); 735 } 736 } 737 738 /* update delegation info? */ 739 if (dirinfo) 740 ceph_fill_dirfrag(inode, dirinfo); 741 742 err = 0; 743 744 out: 745 if (xattr_blob) 746 ceph_buffer_put(xattr_blob); 747 return err; 748 } 749 750 /* 751 * caller should hold session s_mutex. 752 */ 753 static void update_dentry_lease(struct dentry *dentry, 754 struct ceph_mds_reply_lease *lease, 755 struct ceph_mds_session *session, 756 unsigned long from_time) 757 { 758 struct ceph_dentry_info *di = ceph_dentry(dentry); 759 long unsigned duration = le32_to_cpu(lease->duration_ms); 760 long unsigned ttl = from_time + (duration * HZ) / 1000; 761 long unsigned half_ttl = from_time + (duration * HZ / 2) / 1000; 762 struct inode *dir; 763 764 /* only track leases on regular dentries */ 765 if (dentry->d_op != &ceph_dentry_ops) 766 return; 767 768 spin_lock(&dentry->d_lock); 769 dout("update_dentry_lease %p mask %d duration %lu ms ttl %lu\n", 770 dentry, le16_to_cpu(lease->mask), duration, ttl); 771 772 /* make lease_rdcache_gen match directory */ 773 dir = dentry->d_parent->d_inode; 774 di->lease_shared_gen = ceph_inode(dir)->i_shared_gen; 775 776 if (lease->mask == 0) 777 goto out_unlock; 778 779 if (di->lease_gen == session->s_cap_gen && 780 time_before(ttl, dentry->d_time)) 781 goto out_unlock; /* we already have a newer lease. */ 782 783 if (di->lease_session && di->lease_session != session) 784 goto out_unlock; 785 786 ceph_dentry_lru_touch(dentry); 787 788 if (!di->lease_session) 789 di->lease_session = ceph_get_mds_session(session); 790 di->lease_gen = session->s_cap_gen; 791 di->lease_seq = le32_to_cpu(lease->seq); 792 di->lease_renew_after = half_ttl; 793 di->lease_renew_from = 0; 794 dentry->d_time = ttl; 795 out_unlock: 796 spin_unlock(&dentry->d_lock); 797 return; 798 } 799 800 /* 801 * splice a dentry to an inode. 802 * caller must hold directory i_mutex for this to be safe. 803 * 804 * we will only rehash the resulting dentry if @prehash is 805 * true; @prehash will be set to false (for the benefit of 806 * the caller) if we fail. 807 */ 808 static struct dentry *splice_dentry(struct dentry *dn, struct inode *in, 809 bool *prehash) 810 { 811 struct dentry *realdn; 812 813 /* dn must be unhashed */ 814 if (!d_unhashed(dn)) 815 d_drop(dn); 816 realdn = d_materialise_unique(dn, in); 817 if (IS_ERR(realdn)) { 818 pr_err("splice_dentry error %p inode %p ino %llx.%llx\n", 819 dn, in, ceph_vinop(in)); 820 if (prehash) 821 *prehash = false; /* don't rehash on error */ 822 dn = realdn; /* note realdn contains the error */ 823 goto out; 824 } else if (realdn) { 825 dout("dn %p (%d) spliced with %p (%d) " 826 "inode %p ino %llx.%llx\n", 827 dn, atomic_read(&dn->d_count), 828 realdn, atomic_read(&realdn->d_count), 829 realdn->d_inode, ceph_vinop(realdn->d_inode)); 830 dput(dn); 831 dn = realdn; 832 } else { 833 BUG_ON(!ceph_dentry(dn)); 834 835 dout("dn %p attached to %p ino %llx.%llx\n", 836 dn, dn->d_inode, ceph_vinop(dn->d_inode)); 837 } 838 if ((!prehash || *prehash) && d_unhashed(dn)) 839 d_rehash(dn); 840 out: 841 return dn; 842 } 843 844 /* 845 * Set dentry's directory position based on the current dir's max, and 846 * order it in d_subdirs, so that dcache_readdir behaves. 847 */ 848 static void ceph_set_dentry_offset(struct dentry *dn) 849 { 850 struct dentry *dir = dn->d_parent; 851 struct inode *inode = dn->d_parent->d_inode; 852 struct ceph_dentry_info *di; 853 854 BUG_ON(!inode); 855 856 di = ceph_dentry(dn); 857 858 spin_lock(&inode->i_lock); 859 di->offset = ceph_inode(inode)->i_max_offset++; 860 spin_unlock(&inode->i_lock); 861 862 spin_lock(&dcache_lock); 863 spin_lock(&dn->d_lock); 864 list_move_tail(&dir->d_subdirs, &dn->d_u.d_child); 865 dout("set_dentry_offset %p %lld (%p %p)\n", dn, di->offset, 866 dn->d_u.d_child.prev, dn->d_u.d_child.next); 867 spin_unlock(&dn->d_lock); 868 spin_unlock(&dcache_lock); 869 } 870 871 /* 872 * Incorporate results into the local cache. This is either just 873 * one inode, or a directory, dentry, and possibly linked-to inode (e.g., 874 * after a lookup). 875 * 876 * A reply may contain 877 * a directory inode along with a dentry. 878 * and/or a target inode 879 * 880 * Called with snap_rwsem (read). 881 */ 882 int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req, 883 struct ceph_mds_session *session) 884 { 885 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info; 886 struct inode *in = NULL; 887 struct ceph_mds_reply_inode *ininfo; 888 struct ceph_vino vino; 889 struct ceph_client *client = ceph_sb_to_client(sb); 890 int i = 0; 891 int err = 0; 892 893 dout("fill_trace %p is_dentry %d is_target %d\n", req, 894 rinfo->head->is_dentry, rinfo->head->is_target); 895 896 #if 0 897 /* 898 * Debugging hook: 899 * 900 * If we resend completed ops to a recovering mds, we get no 901 * trace. Since that is very rare, pretend this is the case 902 * to ensure the 'no trace' handlers in the callers behave. 903 * 904 * Fill in inodes unconditionally to avoid breaking cap 905 * invariants. 906 */ 907 if (rinfo->head->op & CEPH_MDS_OP_WRITE) { 908 pr_info("fill_trace faking empty trace on %lld %s\n", 909 req->r_tid, ceph_mds_op_name(rinfo->head->op)); 910 if (rinfo->head->is_dentry) { 911 rinfo->head->is_dentry = 0; 912 err = fill_inode(req->r_locked_dir, 913 &rinfo->diri, rinfo->dirfrag, 914 session, req->r_request_started, -1); 915 } 916 if (rinfo->head->is_target) { 917 rinfo->head->is_target = 0; 918 ininfo = rinfo->targeti.in; 919 vino.ino = le64_to_cpu(ininfo->ino); 920 vino.snap = le64_to_cpu(ininfo->snapid); 921 in = ceph_get_inode(sb, vino); 922 err = fill_inode(in, &rinfo->targeti, NULL, 923 session, req->r_request_started, 924 req->r_fmode); 925 iput(in); 926 } 927 } 928 #endif 929 930 if (!rinfo->head->is_target && !rinfo->head->is_dentry) { 931 dout("fill_trace reply is empty!\n"); 932 if (rinfo->head->result == 0 && req->r_locked_dir) { 933 struct ceph_inode_info *ci = 934 ceph_inode(req->r_locked_dir); 935 dout(" clearing %p complete (empty trace)\n", 936 req->r_locked_dir); 937 ci->i_ceph_flags &= ~CEPH_I_COMPLETE; 938 ci->i_release_count++; 939 } 940 return 0; 941 } 942 943 if (rinfo->head->is_dentry) { 944 struct inode *dir = req->r_locked_dir; 945 946 err = fill_inode(dir, &rinfo->diri, rinfo->dirfrag, 947 session, req->r_request_started, -1, 948 &req->r_caps_reservation); 949 if (err < 0) 950 return err; 951 } 952 953 /* 954 * ignore null lease/binding on snapdir ENOENT, or else we 955 * will have trouble splicing in the virtual snapdir later 956 */ 957 if (rinfo->head->is_dentry && !req->r_aborted && 958 (rinfo->head->is_target || strncmp(req->r_dentry->d_name.name, 959 client->mount_args->snapdir_name, 960 req->r_dentry->d_name.len))) { 961 /* 962 * lookup link rename : null -> possibly existing inode 963 * mknod symlink mkdir : null -> new inode 964 * unlink : linked -> null 965 */ 966 struct inode *dir = req->r_locked_dir; 967 struct dentry *dn = req->r_dentry; 968 bool have_dir_cap, have_lease; 969 970 BUG_ON(!dn); 971 BUG_ON(!dir); 972 BUG_ON(dn->d_parent->d_inode != dir); 973 BUG_ON(ceph_ino(dir) != 974 le64_to_cpu(rinfo->diri.in->ino)); 975 BUG_ON(ceph_snap(dir) != 976 le64_to_cpu(rinfo->diri.in->snapid)); 977 978 /* do we have a lease on the whole dir? */ 979 have_dir_cap = 980 (le32_to_cpu(rinfo->diri.in->cap.caps) & 981 CEPH_CAP_FILE_SHARED); 982 983 /* do we have a dn lease? */ 984 have_lease = have_dir_cap || 985 (le16_to_cpu(rinfo->dlease->mask) & 986 CEPH_LOCK_DN); 987 988 if (!have_lease) 989 dout("fill_trace no dentry lease or dir cap\n"); 990 991 /* rename? */ 992 if (req->r_old_dentry && req->r_op == CEPH_MDS_OP_RENAME) { 993 dout(" src %p '%.*s' dst %p '%.*s'\n", 994 req->r_old_dentry, 995 req->r_old_dentry->d_name.len, 996 req->r_old_dentry->d_name.name, 997 dn, dn->d_name.len, dn->d_name.name); 998 dout("fill_trace doing d_move %p -> %p\n", 999 req->r_old_dentry, dn); 1000 d_move(req->r_old_dentry, dn); 1001 dout(" src %p '%.*s' dst %p '%.*s'\n", 1002 req->r_old_dentry, 1003 req->r_old_dentry->d_name.len, 1004 req->r_old_dentry->d_name.name, 1005 dn, dn->d_name.len, dn->d_name.name); 1006 /* ensure target dentry is invalidated, despite 1007 rehashing bug in vfs_rename_dir */ 1008 dn->d_time = jiffies; 1009 ceph_dentry(dn)->lease_shared_gen = 0; 1010 /* take overwritten dentry's readdir offset */ 1011 ceph_dentry(req->r_old_dentry)->offset = 1012 ceph_dentry(dn)->offset; 1013 dn = req->r_old_dentry; /* use old_dentry */ 1014 in = dn->d_inode; 1015 } 1016 1017 /* null dentry? */ 1018 if (!rinfo->head->is_target) { 1019 dout("fill_trace null dentry\n"); 1020 if (dn->d_inode) { 1021 dout("d_delete %p\n", dn); 1022 d_delete(dn); 1023 } else { 1024 dout("d_instantiate %p NULL\n", dn); 1025 d_instantiate(dn, NULL); 1026 if (have_lease && d_unhashed(dn)) 1027 d_rehash(dn); 1028 update_dentry_lease(dn, rinfo->dlease, 1029 session, 1030 req->r_request_started); 1031 } 1032 goto done; 1033 } 1034 1035 /* attach proper inode */ 1036 ininfo = rinfo->targeti.in; 1037 vino.ino = le64_to_cpu(ininfo->ino); 1038 vino.snap = le64_to_cpu(ininfo->snapid); 1039 if (!dn->d_inode) { 1040 in = ceph_get_inode(sb, vino); 1041 if (IS_ERR(in)) { 1042 pr_err("fill_trace bad get_inode " 1043 "%llx.%llx\n", vino.ino, vino.snap); 1044 err = PTR_ERR(in); 1045 d_delete(dn); 1046 goto done; 1047 } 1048 dn = splice_dentry(dn, in, &have_lease); 1049 if (IS_ERR(dn)) { 1050 err = PTR_ERR(dn); 1051 goto done; 1052 } 1053 req->r_dentry = dn; /* may have spliced */ 1054 ceph_set_dentry_offset(dn); 1055 igrab(in); 1056 } else if (ceph_ino(in) == vino.ino && 1057 ceph_snap(in) == vino.snap) { 1058 igrab(in); 1059 } else { 1060 dout(" %p links to %p %llx.%llx, not %llx.%llx\n", 1061 dn, in, ceph_ino(in), ceph_snap(in), 1062 vino.ino, vino.snap); 1063 have_lease = false; 1064 in = NULL; 1065 } 1066 1067 if (have_lease) 1068 update_dentry_lease(dn, rinfo->dlease, session, 1069 req->r_request_started); 1070 dout(" final dn %p\n", dn); 1071 i++; 1072 } else if (req->r_op == CEPH_MDS_OP_LOOKUPSNAP || 1073 req->r_op == CEPH_MDS_OP_MKSNAP) { 1074 struct dentry *dn = req->r_dentry; 1075 1076 /* fill out a snapdir LOOKUPSNAP dentry */ 1077 BUG_ON(!dn); 1078 BUG_ON(!req->r_locked_dir); 1079 BUG_ON(ceph_snap(req->r_locked_dir) != CEPH_SNAPDIR); 1080 ininfo = rinfo->targeti.in; 1081 vino.ino = le64_to_cpu(ininfo->ino); 1082 vino.snap = le64_to_cpu(ininfo->snapid); 1083 in = ceph_get_inode(sb, vino); 1084 if (IS_ERR(in)) { 1085 pr_err("fill_inode get_inode badness %llx.%llx\n", 1086 vino.ino, vino.snap); 1087 err = PTR_ERR(in); 1088 d_delete(dn); 1089 goto done; 1090 } 1091 dout(" linking snapped dir %p to dn %p\n", in, dn); 1092 dn = splice_dentry(dn, in, NULL); 1093 if (IS_ERR(dn)) { 1094 err = PTR_ERR(dn); 1095 goto done; 1096 } 1097 ceph_set_dentry_offset(dn); 1098 req->r_dentry = dn; /* may have spliced */ 1099 igrab(in); 1100 rinfo->head->is_dentry = 1; /* fool notrace handlers */ 1101 } 1102 1103 if (rinfo->head->is_target) { 1104 vino.ino = le64_to_cpu(rinfo->targeti.in->ino); 1105 vino.snap = le64_to_cpu(rinfo->targeti.in->snapid); 1106 1107 if (in == NULL || ceph_ino(in) != vino.ino || 1108 ceph_snap(in) != vino.snap) { 1109 in = ceph_get_inode(sb, vino); 1110 if (IS_ERR(in)) { 1111 err = PTR_ERR(in); 1112 goto done; 1113 } 1114 } 1115 req->r_target_inode = in; 1116 1117 err = fill_inode(in, 1118 &rinfo->targeti, NULL, 1119 session, req->r_request_started, 1120 (le32_to_cpu(rinfo->head->result) == 0) ? 1121 req->r_fmode : -1, 1122 &req->r_caps_reservation); 1123 if (err < 0) { 1124 pr_err("fill_inode badness %p %llx.%llx\n", 1125 in, ceph_vinop(in)); 1126 goto done; 1127 } 1128 } 1129 1130 done: 1131 dout("fill_trace done err=%d\n", err); 1132 return err; 1133 } 1134 1135 /* 1136 * Prepopulate our cache with readdir results, leases, etc. 1137 */ 1138 int ceph_readdir_prepopulate(struct ceph_mds_request *req, 1139 struct ceph_mds_session *session) 1140 { 1141 struct dentry *parent = req->r_dentry; 1142 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info; 1143 struct qstr dname; 1144 struct dentry *dn; 1145 struct inode *in; 1146 int err = 0, i; 1147 struct inode *snapdir = NULL; 1148 struct ceph_mds_request_head *rhead = req->r_request->front.iov_base; 1149 u64 frag = le32_to_cpu(rhead->args.readdir.frag); 1150 struct ceph_dentry_info *di; 1151 1152 if (le32_to_cpu(rinfo->head->op) == CEPH_MDS_OP_LSSNAP) { 1153 snapdir = ceph_get_snapdir(parent->d_inode); 1154 parent = d_find_alias(snapdir); 1155 dout("readdir_prepopulate %d items under SNAPDIR dn %p\n", 1156 rinfo->dir_nr, parent); 1157 } else { 1158 dout("readdir_prepopulate %d items under dn %p\n", 1159 rinfo->dir_nr, parent); 1160 if (rinfo->dir_dir) 1161 ceph_fill_dirfrag(parent->d_inode, rinfo->dir_dir); 1162 } 1163 1164 for (i = 0; i < rinfo->dir_nr; i++) { 1165 struct ceph_vino vino; 1166 1167 dname.name = rinfo->dir_dname[i]; 1168 dname.len = rinfo->dir_dname_len[i]; 1169 dname.hash = full_name_hash(dname.name, dname.len); 1170 1171 vino.ino = le64_to_cpu(rinfo->dir_in[i].in->ino); 1172 vino.snap = le64_to_cpu(rinfo->dir_in[i].in->snapid); 1173 1174 retry_lookup: 1175 dn = d_lookup(parent, &dname); 1176 dout("d_lookup on parent=%p name=%.*s got %p\n", 1177 parent, dname.len, dname.name, dn); 1178 1179 if (!dn) { 1180 dn = d_alloc(parent, &dname); 1181 dout("d_alloc %p '%.*s' = %p\n", parent, 1182 dname.len, dname.name, dn); 1183 if (dn == NULL) { 1184 dout("d_alloc badness\n"); 1185 err = -ENOMEM; 1186 goto out; 1187 } 1188 err = ceph_init_dentry(dn); 1189 if (err < 0) 1190 goto out; 1191 } else if (dn->d_inode && 1192 (ceph_ino(dn->d_inode) != vino.ino || 1193 ceph_snap(dn->d_inode) != vino.snap)) { 1194 dout(" dn %p points to wrong inode %p\n", 1195 dn, dn->d_inode); 1196 d_delete(dn); 1197 dput(dn); 1198 goto retry_lookup; 1199 } else { 1200 /* reorder parent's d_subdirs */ 1201 spin_lock(&dcache_lock); 1202 spin_lock(&dn->d_lock); 1203 list_move(&dn->d_u.d_child, &parent->d_subdirs); 1204 spin_unlock(&dn->d_lock); 1205 spin_unlock(&dcache_lock); 1206 } 1207 1208 di = dn->d_fsdata; 1209 di->offset = ceph_make_fpos(frag, i + req->r_readdir_offset); 1210 1211 /* inode */ 1212 if (dn->d_inode) { 1213 in = dn->d_inode; 1214 } else { 1215 in = ceph_get_inode(parent->d_sb, vino); 1216 if (in == NULL) { 1217 dout("new_inode badness\n"); 1218 d_delete(dn); 1219 dput(dn); 1220 err = -ENOMEM; 1221 goto out; 1222 } 1223 dn = splice_dentry(dn, in, NULL); 1224 } 1225 1226 if (fill_inode(in, &rinfo->dir_in[i], NULL, session, 1227 req->r_request_started, -1, 1228 &req->r_caps_reservation) < 0) { 1229 pr_err("fill_inode badness on %p\n", in); 1230 dput(dn); 1231 continue; 1232 } 1233 update_dentry_lease(dn, rinfo->dir_dlease[i], 1234 req->r_session, req->r_request_started); 1235 dput(dn); 1236 } 1237 req->r_did_prepopulate = true; 1238 1239 out: 1240 if (snapdir) { 1241 iput(snapdir); 1242 dput(parent); 1243 } 1244 dout("readdir_prepopulate done\n"); 1245 return err; 1246 } 1247 1248 int ceph_inode_set_size(struct inode *inode, loff_t size) 1249 { 1250 struct ceph_inode_info *ci = ceph_inode(inode); 1251 int ret = 0; 1252 1253 spin_lock(&inode->i_lock); 1254 dout("set_size %p %llu -> %llu\n", inode, inode->i_size, size); 1255 inode->i_size = size; 1256 inode->i_blocks = (size + (1 << 9) - 1) >> 9; 1257 1258 /* tell the MDS if we are approaching max_size */ 1259 if ((size << 1) >= ci->i_max_size && 1260 (ci->i_reported_size << 1) < ci->i_max_size) 1261 ret = 1; 1262 1263 spin_unlock(&inode->i_lock); 1264 return ret; 1265 } 1266 1267 /* 1268 * Write back inode data in a worker thread. (This can't be done 1269 * in the message handler context.) 1270 */ 1271 void ceph_queue_writeback(struct inode *inode) 1272 { 1273 if (queue_work(ceph_inode_to_client(inode)->wb_wq, 1274 &ceph_inode(inode)->i_wb_work)) { 1275 dout("ceph_queue_writeback %p\n", inode); 1276 igrab(inode); 1277 } else { 1278 dout("ceph_queue_writeback %p failed\n", inode); 1279 } 1280 } 1281 1282 static void ceph_writeback_work(struct work_struct *work) 1283 { 1284 struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info, 1285 i_wb_work); 1286 struct inode *inode = &ci->vfs_inode; 1287 1288 dout("writeback %p\n", inode); 1289 filemap_fdatawrite(&inode->i_data); 1290 iput(inode); 1291 } 1292 1293 /* 1294 * queue an async invalidation 1295 */ 1296 void ceph_queue_invalidate(struct inode *inode) 1297 { 1298 if (queue_work(ceph_inode_to_client(inode)->pg_inv_wq, 1299 &ceph_inode(inode)->i_pg_inv_work)) { 1300 dout("ceph_queue_invalidate %p\n", inode); 1301 igrab(inode); 1302 } else { 1303 dout("ceph_queue_invalidate %p failed\n", inode); 1304 } 1305 } 1306 1307 /* 1308 * invalidate any pages that are not dirty or under writeback. this 1309 * includes pages that are clean and mapped. 1310 */ 1311 static void ceph_invalidate_nondirty_pages(struct address_space *mapping) 1312 { 1313 struct pagevec pvec; 1314 pgoff_t next = 0; 1315 int i; 1316 1317 pagevec_init(&pvec, 0); 1318 while (pagevec_lookup(&pvec, mapping, next, PAGEVEC_SIZE)) { 1319 for (i = 0; i < pagevec_count(&pvec); i++) { 1320 struct page *page = pvec.pages[i]; 1321 pgoff_t index; 1322 int skip_page = 1323 (PageDirty(page) || PageWriteback(page)); 1324 1325 if (!skip_page) 1326 skip_page = !trylock_page(page); 1327 1328 /* 1329 * We really shouldn't be looking at the ->index of an 1330 * unlocked page. But we're not allowed to lock these 1331 * pages. So we rely upon nobody altering the ->index 1332 * of this (pinned-by-us) page. 1333 */ 1334 index = page->index; 1335 if (index > next) 1336 next = index; 1337 next++; 1338 1339 if (skip_page) 1340 continue; 1341 1342 generic_error_remove_page(mapping, page); 1343 unlock_page(page); 1344 } 1345 pagevec_release(&pvec); 1346 cond_resched(); 1347 } 1348 } 1349 1350 /* 1351 * Invalidate inode pages in a worker thread. (This can't be done 1352 * in the message handler context.) 1353 */ 1354 static void ceph_invalidate_work(struct work_struct *work) 1355 { 1356 struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info, 1357 i_pg_inv_work); 1358 struct inode *inode = &ci->vfs_inode; 1359 u32 orig_gen; 1360 int check = 0; 1361 1362 spin_lock(&inode->i_lock); 1363 dout("invalidate_pages %p gen %d revoking %d\n", inode, 1364 ci->i_rdcache_gen, ci->i_rdcache_revoking); 1365 if (ci->i_rdcache_gen == 0 || 1366 ci->i_rdcache_revoking != ci->i_rdcache_gen) { 1367 BUG_ON(ci->i_rdcache_revoking > ci->i_rdcache_gen); 1368 /* nevermind! */ 1369 ci->i_rdcache_revoking = 0; 1370 spin_unlock(&inode->i_lock); 1371 goto out; 1372 } 1373 orig_gen = ci->i_rdcache_gen; 1374 spin_unlock(&inode->i_lock); 1375 1376 ceph_invalidate_nondirty_pages(inode->i_mapping); 1377 1378 spin_lock(&inode->i_lock); 1379 if (orig_gen == ci->i_rdcache_gen) { 1380 dout("invalidate_pages %p gen %d successful\n", inode, 1381 ci->i_rdcache_gen); 1382 ci->i_rdcache_gen = 0; 1383 ci->i_rdcache_revoking = 0; 1384 check = 1; 1385 } else { 1386 dout("invalidate_pages %p gen %d raced, gen now %d\n", 1387 inode, orig_gen, ci->i_rdcache_gen); 1388 } 1389 spin_unlock(&inode->i_lock); 1390 1391 if (check) 1392 ceph_check_caps(ci, 0, NULL); 1393 out: 1394 iput(inode); 1395 } 1396 1397 1398 /* 1399 * called by trunc_wq; take i_mutex ourselves 1400 * 1401 * We also truncate in a separate thread as well. 1402 */ 1403 static void ceph_vmtruncate_work(struct work_struct *work) 1404 { 1405 struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info, 1406 i_vmtruncate_work); 1407 struct inode *inode = &ci->vfs_inode; 1408 1409 dout("vmtruncate_work %p\n", inode); 1410 mutex_lock(&inode->i_mutex); 1411 __ceph_do_pending_vmtruncate(inode); 1412 mutex_unlock(&inode->i_mutex); 1413 iput(inode); 1414 } 1415 1416 /* 1417 * Queue an async vmtruncate. If we fail to queue work, we will handle 1418 * the truncation the next time we call __ceph_do_pending_vmtruncate. 1419 */ 1420 void ceph_queue_vmtruncate(struct inode *inode) 1421 { 1422 struct ceph_inode_info *ci = ceph_inode(inode); 1423 1424 if (queue_work(ceph_client(inode->i_sb)->trunc_wq, 1425 &ci->i_vmtruncate_work)) { 1426 dout("ceph_queue_vmtruncate %p\n", inode); 1427 igrab(inode); 1428 } else { 1429 dout("ceph_queue_vmtruncate %p failed, pending=%d\n", 1430 inode, ci->i_truncate_pending); 1431 } 1432 } 1433 1434 /* 1435 * called with i_mutex held. 1436 * 1437 * Make sure any pending truncation is applied before doing anything 1438 * that may depend on it. 1439 */ 1440 void __ceph_do_pending_vmtruncate(struct inode *inode) 1441 { 1442 struct ceph_inode_info *ci = ceph_inode(inode); 1443 u64 to; 1444 int wrbuffer_refs, wake = 0; 1445 1446 retry: 1447 spin_lock(&inode->i_lock); 1448 if (ci->i_truncate_pending == 0) { 1449 dout("__do_pending_vmtruncate %p none pending\n", inode); 1450 spin_unlock(&inode->i_lock); 1451 return; 1452 } 1453 1454 /* 1455 * make sure any dirty snapped pages are flushed before we 1456 * possibly truncate them.. so write AND block! 1457 */ 1458 if (ci->i_wrbuffer_ref_head < ci->i_wrbuffer_ref) { 1459 dout("__do_pending_vmtruncate %p flushing snaps first\n", 1460 inode); 1461 spin_unlock(&inode->i_lock); 1462 filemap_write_and_wait_range(&inode->i_data, 0, 1463 inode->i_sb->s_maxbytes); 1464 goto retry; 1465 } 1466 1467 to = ci->i_truncate_size; 1468 wrbuffer_refs = ci->i_wrbuffer_ref; 1469 dout("__do_pending_vmtruncate %p (%d) to %lld\n", inode, 1470 ci->i_truncate_pending, to); 1471 spin_unlock(&inode->i_lock); 1472 1473 truncate_inode_pages(inode->i_mapping, to); 1474 1475 spin_lock(&inode->i_lock); 1476 ci->i_truncate_pending--; 1477 if (ci->i_truncate_pending == 0) 1478 wake = 1; 1479 spin_unlock(&inode->i_lock); 1480 1481 if (wrbuffer_refs == 0) 1482 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL); 1483 if (wake) 1484 wake_up(&ci->i_cap_wq); 1485 } 1486 1487 1488 /* 1489 * symlinks 1490 */ 1491 static void *ceph_sym_follow_link(struct dentry *dentry, struct nameidata *nd) 1492 { 1493 struct ceph_inode_info *ci = ceph_inode(dentry->d_inode); 1494 nd_set_link(nd, ci->i_symlink); 1495 return NULL; 1496 } 1497 1498 static const struct inode_operations ceph_symlink_iops = { 1499 .readlink = generic_readlink, 1500 .follow_link = ceph_sym_follow_link, 1501 }; 1502 1503 /* 1504 * setattr 1505 */ 1506 int ceph_setattr(struct dentry *dentry, struct iattr *attr) 1507 { 1508 struct inode *inode = dentry->d_inode; 1509 struct ceph_inode_info *ci = ceph_inode(inode); 1510 struct inode *parent_inode = dentry->d_parent->d_inode; 1511 const unsigned int ia_valid = attr->ia_valid; 1512 struct ceph_mds_request *req; 1513 struct ceph_mds_client *mdsc = &ceph_client(dentry->d_sb)->mdsc; 1514 int issued; 1515 int release = 0, dirtied = 0; 1516 int mask = 0; 1517 int err = 0; 1518 1519 if (ceph_snap(inode) != CEPH_NOSNAP) 1520 return -EROFS; 1521 1522 __ceph_do_pending_vmtruncate(inode); 1523 1524 err = inode_change_ok(inode, attr); 1525 if (err != 0) 1526 return err; 1527 1528 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETATTR, 1529 USE_AUTH_MDS); 1530 if (IS_ERR(req)) 1531 return PTR_ERR(req); 1532 1533 spin_lock(&inode->i_lock); 1534 issued = __ceph_caps_issued(ci, NULL); 1535 dout("setattr %p issued %s\n", inode, ceph_cap_string(issued)); 1536 1537 if (ia_valid & ATTR_UID) { 1538 dout("setattr %p uid %d -> %d\n", inode, 1539 inode->i_uid, attr->ia_uid); 1540 if (issued & CEPH_CAP_AUTH_EXCL) { 1541 inode->i_uid = attr->ia_uid; 1542 dirtied |= CEPH_CAP_AUTH_EXCL; 1543 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 || 1544 attr->ia_uid != inode->i_uid) { 1545 req->r_args.setattr.uid = cpu_to_le32(attr->ia_uid); 1546 mask |= CEPH_SETATTR_UID; 1547 release |= CEPH_CAP_AUTH_SHARED; 1548 } 1549 } 1550 if (ia_valid & ATTR_GID) { 1551 dout("setattr %p gid %d -> %d\n", inode, 1552 inode->i_gid, attr->ia_gid); 1553 if (issued & CEPH_CAP_AUTH_EXCL) { 1554 inode->i_gid = attr->ia_gid; 1555 dirtied |= CEPH_CAP_AUTH_EXCL; 1556 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 || 1557 attr->ia_gid != inode->i_gid) { 1558 req->r_args.setattr.gid = cpu_to_le32(attr->ia_gid); 1559 mask |= CEPH_SETATTR_GID; 1560 release |= CEPH_CAP_AUTH_SHARED; 1561 } 1562 } 1563 if (ia_valid & ATTR_MODE) { 1564 dout("setattr %p mode 0%o -> 0%o\n", inode, inode->i_mode, 1565 attr->ia_mode); 1566 if (issued & CEPH_CAP_AUTH_EXCL) { 1567 inode->i_mode = attr->ia_mode; 1568 dirtied |= CEPH_CAP_AUTH_EXCL; 1569 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 || 1570 attr->ia_mode != inode->i_mode) { 1571 req->r_args.setattr.mode = cpu_to_le32(attr->ia_mode); 1572 mask |= CEPH_SETATTR_MODE; 1573 release |= CEPH_CAP_AUTH_SHARED; 1574 } 1575 } 1576 1577 if (ia_valid & ATTR_ATIME) { 1578 dout("setattr %p atime %ld.%ld -> %ld.%ld\n", inode, 1579 inode->i_atime.tv_sec, inode->i_atime.tv_nsec, 1580 attr->ia_atime.tv_sec, attr->ia_atime.tv_nsec); 1581 if (issued & CEPH_CAP_FILE_EXCL) { 1582 ci->i_time_warp_seq++; 1583 inode->i_atime = attr->ia_atime; 1584 dirtied |= CEPH_CAP_FILE_EXCL; 1585 } else if ((issued & CEPH_CAP_FILE_WR) && 1586 timespec_compare(&inode->i_atime, 1587 &attr->ia_atime) < 0) { 1588 inode->i_atime = attr->ia_atime; 1589 dirtied |= CEPH_CAP_FILE_WR; 1590 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 || 1591 !timespec_equal(&inode->i_atime, &attr->ia_atime)) { 1592 ceph_encode_timespec(&req->r_args.setattr.atime, 1593 &attr->ia_atime); 1594 mask |= CEPH_SETATTR_ATIME; 1595 release |= CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_RD | 1596 CEPH_CAP_FILE_WR; 1597 } 1598 } 1599 if (ia_valid & ATTR_MTIME) { 1600 dout("setattr %p mtime %ld.%ld -> %ld.%ld\n", inode, 1601 inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec, 1602 attr->ia_mtime.tv_sec, attr->ia_mtime.tv_nsec); 1603 if (issued & CEPH_CAP_FILE_EXCL) { 1604 ci->i_time_warp_seq++; 1605 inode->i_mtime = attr->ia_mtime; 1606 dirtied |= CEPH_CAP_FILE_EXCL; 1607 } else if ((issued & CEPH_CAP_FILE_WR) && 1608 timespec_compare(&inode->i_mtime, 1609 &attr->ia_mtime) < 0) { 1610 inode->i_mtime = attr->ia_mtime; 1611 dirtied |= CEPH_CAP_FILE_WR; 1612 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 || 1613 !timespec_equal(&inode->i_mtime, &attr->ia_mtime)) { 1614 ceph_encode_timespec(&req->r_args.setattr.mtime, 1615 &attr->ia_mtime); 1616 mask |= CEPH_SETATTR_MTIME; 1617 release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD | 1618 CEPH_CAP_FILE_WR; 1619 } 1620 } 1621 if (ia_valid & ATTR_SIZE) { 1622 dout("setattr %p size %lld -> %lld\n", inode, 1623 inode->i_size, attr->ia_size); 1624 if (attr->ia_size > inode->i_sb->s_maxbytes) { 1625 err = -EINVAL; 1626 goto out; 1627 } 1628 if ((issued & CEPH_CAP_FILE_EXCL) && 1629 attr->ia_size > inode->i_size) { 1630 inode->i_size = attr->ia_size; 1631 inode->i_blocks = 1632 (attr->ia_size + (1 << 9) - 1) >> 9; 1633 inode->i_ctime = attr->ia_ctime; 1634 ci->i_reported_size = attr->ia_size; 1635 dirtied |= CEPH_CAP_FILE_EXCL; 1636 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 || 1637 attr->ia_size != inode->i_size) { 1638 req->r_args.setattr.size = cpu_to_le64(attr->ia_size); 1639 req->r_args.setattr.old_size = 1640 cpu_to_le64(inode->i_size); 1641 mask |= CEPH_SETATTR_SIZE; 1642 release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD | 1643 CEPH_CAP_FILE_WR; 1644 } 1645 } 1646 1647 /* these do nothing */ 1648 if (ia_valid & ATTR_CTIME) { 1649 bool only = (ia_valid & (ATTR_SIZE|ATTR_MTIME|ATTR_ATIME| 1650 ATTR_MODE|ATTR_UID|ATTR_GID)) == 0; 1651 dout("setattr %p ctime %ld.%ld -> %ld.%ld (%s)\n", inode, 1652 inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec, 1653 attr->ia_ctime.tv_sec, attr->ia_ctime.tv_nsec, 1654 only ? "ctime only" : "ignored"); 1655 inode->i_ctime = attr->ia_ctime; 1656 if (only) { 1657 /* 1658 * if kernel wants to dirty ctime but nothing else, 1659 * we need to choose a cap to dirty under, or do 1660 * a almost-no-op setattr 1661 */ 1662 if (issued & CEPH_CAP_AUTH_EXCL) 1663 dirtied |= CEPH_CAP_AUTH_EXCL; 1664 else if (issued & CEPH_CAP_FILE_EXCL) 1665 dirtied |= CEPH_CAP_FILE_EXCL; 1666 else if (issued & CEPH_CAP_XATTR_EXCL) 1667 dirtied |= CEPH_CAP_XATTR_EXCL; 1668 else 1669 mask |= CEPH_SETATTR_CTIME; 1670 } 1671 } 1672 if (ia_valid & ATTR_FILE) 1673 dout("setattr %p ATTR_FILE ... hrm!\n", inode); 1674 1675 if (dirtied) { 1676 __ceph_mark_dirty_caps(ci, dirtied); 1677 inode->i_ctime = CURRENT_TIME; 1678 } 1679 1680 release &= issued; 1681 spin_unlock(&inode->i_lock); 1682 1683 if (mask) { 1684 req->r_inode = igrab(inode); 1685 req->r_inode_drop = release; 1686 req->r_args.setattr.mask = cpu_to_le32(mask); 1687 req->r_num_caps = 1; 1688 err = ceph_mdsc_do_request(mdsc, parent_inode, req); 1689 } 1690 dout("setattr %p result=%d (%s locally, %d remote)\n", inode, err, 1691 ceph_cap_string(dirtied), mask); 1692 1693 ceph_mdsc_put_request(req); 1694 __ceph_do_pending_vmtruncate(inode); 1695 return err; 1696 out: 1697 spin_unlock(&inode->i_lock); 1698 ceph_mdsc_put_request(req); 1699 return err; 1700 } 1701 1702 /* 1703 * Verify that we have a lease on the given mask. If not, 1704 * do a getattr against an mds. 1705 */ 1706 int ceph_do_getattr(struct inode *inode, int mask) 1707 { 1708 struct ceph_client *client = ceph_sb_to_client(inode->i_sb); 1709 struct ceph_mds_client *mdsc = &client->mdsc; 1710 struct ceph_mds_request *req; 1711 int err; 1712 1713 if (ceph_snap(inode) == CEPH_SNAPDIR) { 1714 dout("do_getattr inode %p SNAPDIR\n", inode); 1715 return 0; 1716 } 1717 1718 dout("do_getattr inode %p mask %s\n", inode, ceph_cap_string(mask)); 1719 if (ceph_caps_issued_mask(ceph_inode(inode), mask, 1)) 1720 return 0; 1721 1722 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS); 1723 if (IS_ERR(req)) 1724 return PTR_ERR(req); 1725 req->r_inode = igrab(inode); 1726 req->r_num_caps = 1; 1727 req->r_args.getattr.mask = cpu_to_le32(mask); 1728 err = ceph_mdsc_do_request(mdsc, NULL, req); 1729 ceph_mdsc_put_request(req); 1730 dout("do_getattr result=%d\n", err); 1731 return err; 1732 } 1733 1734 1735 /* 1736 * Check inode permissions. We verify we have a valid value for 1737 * the AUTH cap, then call the generic handler. 1738 */ 1739 int ceph_permission(struct inode *inode, int mask) 1740 { 1741 int err = ceph_do_getattr(inode, CEPH_CAP_AUTH_SHARED); 1742 1743 if (!err) 1744 err = generic_permission(inode, mask, NULL); 1745 return err; 1746 } 1747 1748 /* 1749 * Get all attributes. Hopefully somedata we'll have a statlite() 1750 * and can limit the fields we require to be accurate. 1751 */ 1752 int ceph_getattr(struct vfsmount *mnt, struct dentry *dentry, 1753 struct kstat *stat) 1754 { 1755 struct inode *inode = dentry->d_inode; 1756 struct ceph_inode_info *ci = ceph_inode(inode); 1757 int err; 1758 1759 err = ceph_do_getattr(inode, CEPH_STAT_CAP_INODE_ALL); 1760 if (!err) { 1761 generic_fillattr(inode, stat); 1762 stat->ino = inode->i_ino; 1763 if (ceph_snap(inode) != CEPH_NOSNAP) 1764 stat->dev = ceph_snap(inode); 1765 else 1766 stat->dev = 0; 1767 if (S_ISDIR(inode->i_mode)) { 1768 stat->size = ci->i_rbytes; 1769 stat->blocks = 0; 1770 stat->blksize = 65536; 1771 } 1772 } 1773 return err; 1774 } 1775