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 kfree(ci->i_symlink); 382 while ((n = rb_first(&ci->i_fragtree)) != NULL) { 383 frag = rb_entry(n, struct ceph_inode_frag, node); 384 rb_erase(n, &ci->i_fragtree); 385 kfree(frag); 386 } 387 388 __ceph_destroy_xattrs(ci); 389 if (ci->i_xattrs.blob) 390 ceph_buffer_put(ci->i_xattrs.blob); 391 if (ci->i_xattrs.prealloc_blob) 392 ceph_buffer_put(ci->i_xattrs.prealloc_blob); 393 394 kmem_cache_free(ceph_inode_cachep, ci); 395 } 396 397 398 /* 399 * Helpers to fill in size, ctime, mtime, and atime. We have to be 400 * careful because either the client or MDS may have more up to date 401 * info, depending on which capabilities are held, and whether 402 * time_warp_seq or truncate_seq have increased. (Ordinarily, mtime 403 * and size are monotonically increasing, except when utimes() or 404 * truncate() increments the corresponding _seq values.) 405 */ 406 int ceph_fill_file_size(struct inode *inode, int issued, 407 u32 truncate_seq, u64 truncate_size, u64 size) 408 { 409 struct ceph_inode_info *ci = ceph_inode(inode); 410 int queue_trunc = 0; 411 412 if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) > 0 || 413 (truncate_seq == ci->i_truncate_seq && size > inode->i_size)) { 414 dout("size %lld -> %llu\n", inode->i_size, size); 415 inode->i_size = size; 416 inode->i_blocks = (size + (1<<9) - 1) >> 9; 417 ci->i_reported_size = size; 418 if (truncate_seq != ci->i_truncate_seq) { 419 dout("truncate_seq %u -> %u\n", 420 ci->i_truncate_seq, truncate_seq); 421 ci->i_truncate_seq = truncate_seq; 422 /* 423 * If we hold relevant caps, or in the case where we're 424 * not the only client referencing this file and we 425 * don't hold those caps, then we need to check whether 426 * the file is either opened or mmaped 427 */ 428 if ((issued & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_RD| 429 CEPH_CAP_FILE_WR|CEPH_CAP_FILE_BUFFER| 430 CEPH_CAP_FILE_EXCL)) || 431 mapping_mapped(inode->i_mapping) || 432 __ceph_caps_file_wanted(ci)) { 433 ci->i_truncate_pending++; 434 queue_trunc = 1; 435 } 436 } 437 } 438 if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) >= 0 && 439 ci->i_truncate_size != truncate_size) { 440 dout("truncate_size %lld -> %llu\n", ci->i_truncate_size, 441 truncate_size); 442 ci->i_truncate_size = truncate_size; 443 } 444 return queue_trunc; 445 } 446 447 void ceph_fill_file_time(struct inode *inode, int issued, 448 u64 time_warp_seq, struct timespec *ctime, 449 struct timespec *mtime, struct timespec *atime) 450 { 451 struct ceph_inode_info *ci = ceph_inode(inode); 452 int warn = 0; 453 454 if (issued & (CEPH_CAP_FILE_EXCL| 455 CEPH_CAP_FILE_WR| 456 CEPH_CAP_FILE_BUFFER)) { 457 if (timespec_compare(ctime, &inode->i_ctime) > 0) { 458 dout("ctime %ld.%09ld -> %ld.%09ld inc w/ cap\n", 459 inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec, 460 ctime->tv_sec, ctime->tv_nsec); 461 inode->i_ctime = *ctime; 462 } 463 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) > 0) { 464 /* the MDS did a utimes() */ 465 dout("mtime %ld.%09ld -> %ld.%09ld " 466 "tw %d -> %d\n", 467 inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec, 468 mtime->tv_sec, mtime->tv_nsec, 469 ci->i_time_warp_seq, (int)time_warp_seq); 470 471 inode->i_mtime = *mtime; 472 inode->i_atime = *atime; 473 ci->i_time_warp_seq = time_warp_seq; 474 } else if (time_warp_seq == ci->i_time_warp_seq) { 475 /* nobody did utimes(); take the max */ 476 if (timespec_compare(mtime, &inode->i_mtime) > 0) { 477 dout("mtime %ld.%09ld -> %ld.%09ld inc\n", 478 inode->i_mtime.tv_sec, 479 inode->i_mtime.tv_nsec, 480 mtime->tv_sec, mtime->tv_nsec); 481 inode->i_mtime = *mtime; 482 } 483 if (timespec_compare(atime, &inode->i_atime) > 0) { 484 dout("atime %ld.%09ld -> %ld.%09ld inc\n", 485 inode->i_atime.tv_sec, 486 inode->i_atime.tv_nsec, 487 atime->tv_sec, atime->tv_nsec); 488 inode->i_atime = *atime; 489 } 490 } else if (issued & CEPH_CAP_FILE_EXCL) { 491 /* we did a utimes(); ignore mds values */ 492 } else { 493 warn = 1; 494 } 495 } else { 496 /* we have no write caps; whatever the MDS says is true */ 497 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) >= 0) { 498 inode->i_ctime = *ctime; 499 inode->i_mtime = *mtime; 500 inode->i_atime = *atime; 501 ci->i_time_warp_seq = time_warp_seq; 502 } else { 503 warn = 1; 504 } 505 } 506 if (warn) /* time_warp_seq shouldn't go backwards */ 507 dout("%p mds time_warp_seq %llu < %u\n", 508 inode, time_warp_seq, ci->i_time_warp_seq); 509 } 510 511 /* 512 * Populate an inode based on info from mds. May be called on new or 513 * existing inodes. 514 */ 515 static int fill_inode(struct inode *inode, 516 struct ceph_mds_reply_info_in *iinfo, 517 struct ceph_mds_reply_dirfrag *dirinfo, 518 struct ceph_mds_session *session, 519 unsigned long ttl_from, int cap_fmode, 520 struct ceph_cap_reservation *caps_reservation) 521 { 522 struct ceph_mds_reply_inode *info = iinfo->in; 523 struct ceph_inode_info *ci = ceph_inode(inode); 524 int i; 525 int issued, implemented; 526 struct timespec mtime, atime, ctime; 527 u32 nsplits; 528 struct ceph_buffer *xattr_blob = NULL; 529 int err = 0; 530 int queue_trunc = 0; 531 532 dout("fill_inode %p ino %llx.%llx v %llu had %llu\n", 533 inode, ceph_vinop(inode), le64_to_cpu(info->version), 534 ci->i_version); 535 536 /* 537 * prealloc xattr data, if it looks like we'll need it. only 538 * if len > 4 (meaning there are actually xattrs; the first 4 539 * bytes are the xattr count). 540 */ 541 if (iinfo->xattr_len > 4) { 542 xattr_blob = ceph_buffer_new(iinfo->xattr_len, GFP_NOFS); 543 if (!xattr_blob) 544 pr_err("fill_inode ENOMEM xattr blob %d bytes\n", 545 iinfo->xattr_len); 546 } 547 548 spin_lock(&inode->i_lock); 549 550 /* 551 * provided version will be odd if inode value is projected, 552 * even if stable. skip the update if we have a newer info 553 * (e.g., due to inode info racing form multiple MDSs), or if 554 * we are getting projected (unstable) inode info. 555 */ 556 if (le64_to_cpu(info->version) > 0 && 557 (ci->i_version & ~1) > le64_to_cpu(info->version)) 558 goto no_change; 559 560 issued = __ceph_caps_issued(ci, &implemented); 561 issued |= implemented | __ceph_caps_dirty(ci); 562 563 /* update inode */ 564 ci->i_version = le64_to_cpu(info->version); 565 inode->i_version++; 566 inode->i_rdev = le32_to_cpu(info->rdev); 567 568 if ((issued & CEPH_CAP_AUTH_EXCL) == 0) { 569 inode->i_mode = le32_to_cpu(info->mode); 570 inode->i_uid = le32_to_cpu(info->uid); 571 inode->i_gid = le32_to_cpu(info->gid); 572 dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode, 573 inode->i_uid, inode->i_gid); 574 } 575 576 if ((issued & CEPH_CAP_LINK_EXCL) == 0) 577 inode->i_nlink = le32_to_cpu(info->nlink); 578 579 /* be careful with mtime, atime, size */ 580 ceph_decode_timespec(&atime, &info->atime); 581 ceph_decode_timespec(&mtime, &info->mtime); 582 ceph_decode_timespec(&ctime, &info->ctime); 583 queue_trunc = ceph_fill_file_size(inode, issued, 584 le32_to_cpu(info->truncate_seq), 585 le64_to_cpu(info->truncate_size), 586 le64_to_cpu(info->size)); 587 ceph_fill_file_time(inode, issued, 588 le32_to_cpu(info->time_warp_seq), 589 &ctime, &mtime, &atime); 590 591 ci->i_max_size = le64_to_cpu(info->max_size); 592 ci->i_layout = info->layout; 593 inode->i_blkbits = fls(le32_to_cpu(info->layout.fl_stripe_unit)) - 1; 594 595 /* xattrs */ 596 /* note that if i_xattrs.len <= 4, i_xattrs.data will still be NULL. */ 597 if ((issued & CEPH_CAP_XATTR_EXCL) == 0 && 598 le64_to_cpu(info->xattr_version) > ci->i_xattrs.version) { 599 if (ci->i_xattrs.blob) 600 ceph_buffer_put(ci->i_xattrs.blob); 601 ci->i_xattrs.blob = xattr_blob; 602 if (xattr_blob) 603 memcpy(ci->i_xattrs.blob->vec.iov_base, 604 iinfo->xattr_data, iinfo->xattr_len); 605 ci->i_xattrs.version = le64_to_cpu(info->xattr_version); 606 } 607 608 inode->i_mapping->a_ops = &ceph_aops; 609 inode->i_mapping->backing_dev_info = 610 &ceph_client(inode->i_sb)->backing_dev_info; 611 612 switch (inode->i_mode & S_IFMT) { 613 case S_IFIFO: 614 case S_IFBLK: 615 case S_IFCHR: 616 case S_IFSOCK: 617 init_special_inode(inode, inode->i_mode, inode->i_rdev); 618 inode->i_op = &ceph_file_iops; 619 break; 620 case S_IFREG: 621 inode->i_op = &ceph_file_iops; 622 inode->i_fop = &ceph_file_fops; 623 break; 624 case S_IFLNK: 625 inode->i_op = &ceph_symlink_iops; 626 if (!ci->i_symlink) { 627 int symlen = iinfo->symlink_len; 628 char *sym; 629 630 BUG_ON(symlen != inode->i_size); 631 spin_unlock(&inode->i_lock); 632 633 err = -ENOMEM; 634 sym = kmalloc(symlen+1, GFP_NOFS); 635 if (!sym) 636 goto out; 637 memcpy(sym, iinfo->symlink, symlen); 638 sym[symlen] = 0; 639 640 spin_lock(&inode->i_lock); 641 if (!ci->i_symlink) 642 ci->i_symlink = sym; 643 else 644 kfree(sym); /* lost a race */ 645 } 646 break; 647 case S_IFDIR: 648 inode->i_op = &ceph_dir_iops; 649 inode->i_fop = &ceph_dir_fops; 650 651 ci->i_files = le64_to_cpu(info->files); 652 ci->i_subdirs = le64_to_cpu(info->subdirs); 653 ci->i_rbytes = le64_to_cpu(info->rbytes); 654 ci->i_rfiles = le64_to_cpu(info->rfiles); 655 ci->i_rsubdirs = le64_to_cpu(info->rsubdirs); 656 ceph_decode_timespec(&ci->i_rctime, &info->rctime); 657 658 /* set dir completion flag? */ 659 if (ci->i_files == 0 && ci->i_subdirs == 0 && 660 ceph_snap(inode) == CEPH_NOSNAP && 661 (le32_to_cpu(info->cap.caps) & CEPH_CAP_FILE_SHARED)) { 662 dout(" marking %p complete (empty)\n", inode); 663 ci->i_ceph_flags |= CEPH_I_COMPLETE; 664 ci->i_max_offset = 2; 665 } 666 667 /* it may be better to set st_size in getattr instead? */ 668 if (ceph_test_opt(ceph_client(inode->i_sb), RBYTES)) 669 inode->i_size = ci->i_rbytes; 670 break; 671 default: 672 pr_err("fill_inode %llx.%llx BAD mode 0%o\n", 673 ceph_vinop(inode), inode->i_mode); 674 } 675 676 no_change: 677 spin_unlock(&inode->i_lock); 678 679 /* queue truncate if we saw i_size decrease */ 680 if (queue_trunc) 681 ceph_queue_vmtruncate(inode); 682 683 /* populate frag tree */ 684 /* FIXME: move me up, if/when version reflects fragtree changes */ 685 nsplits = le32_to_cpu(info->fragtree.nsplits); 686 mutex_lock(&ci->i_fragtree_mutex); 687 for (i = 0; i < nsplits; i++) { 688 u32 id = le32_to_cpu(info->fragtree.splits[i].frag); 689 struct ceph_inode_frag *frag = __get_or_create_frag(ci, id); 690 691 if (IS_ERR(frag)) 692 continue; 693 frag->split_by = le32_to_cpu(info->fragtree.splits[i].by); 694 dout(" frag %x split by %d\n", frag->frag, frag->split_by); 695 } 696 mutex_unlock(&ci->i_fragtree_mutex); 697 698 /* were we issued a capability? */ 699 if (info->cap.caps) { 700 if (ceph_snap(inode) == CEPH_NOSNAP) { 701 ceph_add_cap(inode, session, 702 le64_to_cpu(info->cap.cap_id), 703 cap_fmode, 704 le32_to_cpu(info->cap.caps), 705 le32_to_cpu(info->cap.wanted), 706 le32_to_cpu(info->cap.seq), 707 le32_to_cpu(info->cap.mseq), 708 le64_to_cpu(info->cap.realm), 709 info->cap.flags, 710 caps_reservation); 711 } else { 712 spin_lock(&inode->i_lock); 713 dout(" %p got snap_caps %s\n", inode, 714 ceph_cap_string(le32_to_cpu(info->cap.caps))); 715 ci->i_snap_caps |= le32_to_cpu(info->cap.caps); 716 if (cap_fmode >= 0) 717 __ceph_get_fmode(ci, cap_fmode); 718 spin_unlock(&inode->i_lock); 719 } 720 } 721 722 /* update delegation info? */ 723 if (dirinfo) 724 ceph_fill_dirfrag(inode, dirinfo); 725 726 err = 0; 727 728 out: 729 if (xattr_blob) 730 ceph_buffer_put(xattr_blob); 731 return err; 732 } 733 734 /* 735 * caller should hold session s_mutex. 736 */ 737 static void update_dentry_lease(struct dentry *dentry, 738 struct ceph_mds_reply_lease *lease, 739 struct ceph_mds_session *session, 740 unsigned long from_time) 741 { 742 struct ceph_dentry_info *di = ceph_dentry(dentry); 743 long unsigned duration = le32_to_cpu(lease->duration_ms); 744 long unsigned ttl = from_time + (duration * HZ) / 1000; 745 long unsigned half_ttl = from_time + (duration * HZ / 2) / 1000; 746 struct inode *dir; 747 748 /* only track leases on regular dentries */ 749 if (dentry->d_op != &ceph_dentry_ops) 750 return; 751 752 spin_lock(&dentry->d_lock); 753 dout("update_dentry_lease %p mask %d duration %lu ms ttl %lu\n", 754 dentry, le16_to_cpu(lease->mask), duration, ttl); 755 756 /* make lease_rdcache_gen match directory */ 757 dir = dentry->d_parent->d_inode; 758 di->lease_shared_gen = ceph_inode(dir)->i_shared_gen; 759 760 if (lease->mask == 0) 761 goto out_unlock; 762 763 if (di->lease_gen == session->s_cap_gen && 764 time_before(ttl, dentry->d_time)) 765 goto out_unlock; /* we already have a newer lease. */ 766 767 if (di->lease_session && di->lease_session != session) 768 goto out_unlock; 769 770 ceph_dentry_lru_touch(dentry); 771 772 if (!di->lease_session) 773 di->lease_session = ceph_get_mds_session(session); 774 di->lease_gen = session->s_cap_gen; 775 di->lease_seq = le32_to_cpu(lease->seq); 776 di->lease_renew_after = half_ttl; 777 di->lease_renew_from = 0; 778 dentry->d_time = ttl; 779 out_unlock: 780 spin_unlock(&dentry->d_lock); 781 return; 782 } 783 784 /* 785 * splice a dentry to an inode. 786 * caller must hold directory i_mutex for this to be safe. 787 * 788 * we will only rehash the resulting dentry if @prehash is 789 * true; @prehash will be set to false (for the benefit of 790 * the caller) if we fail. 791 */ 792 static struct dentry *splice_dentry(struct dentry *dn, struct inode *in, 793 bool *prehash) 794 { 795 struct dentry *realdn; 796 797 /* dn must be unhashed */ 798 if (!d_unhashed(dn)) 799 d_drop(dn); 800 realdn = d_materialise_unique(dn, in); 801 if (IS_ERR(realdn)) { 802 pr_err("splice_dentry error %p inode %p ino %llx.%llx\n", 803 dn, in, ceph_vinop(in)); 804 if (prehash) 805 *prehash = false; /* don't rehash on error */ 806 dn = realdn; /* note realdn contains the error */ 807 goto out; 808 } else if (realdn) { 809 dout("dn %p (%d) spliced with %p (%d) " 810 "inode %p ino %llx.%llx\n", 811 dn, atomic_read(&dn->d_count), 812 realdn, atomic_read(&realdn->d_count), 813 realdn->d_inode, ceph_vinop(realdn->d_inode)); 814 dput(dn); 815 dn = realdn; 816 } else { 817 BUG_ON(!ceph_dentry(dn)); 818 819 dout("dn %p attached to %p ino %llx.%llx\n", 820 dn, dn->d_inode, ceph_vinop(dn->d_inode)); 821 } 822 if ((!prehash || *prehash) && d_unhashed(dn)) 823 d_rehash(dn); 824 out: 825 return dn; 826 } 827 828 /* 829 * Set dentry's directory position based on the current dir's max, and 830 * order it in d_subdirs, so that dcache_readdir behaves. 831 */ 832 static void ceph_set_dentry_offset(struct dentry *dn) 833 { 834 struct dentry *dir = dn->d_parent; 835 struct inode *inode = dn->d_parent->d_inode; 836 struct ceph_dentry_info *di; 837 838 BUG_ON(!inode); 839 840 di = ceph_dentry(dn); 841 842 spin_lock(&inode->i_lock); 843 di->offset = ceph_inode(inode)->i_max_offset++; 844 spin_unlock(&inode->i_lock); 845 846 spin_lock(&dcache_lock); 847 spin_lock(&dn->d_lock); 848 list_move_tail(&dir->d_subdirs, &dn->d_u.d_child); 849 dout("set_dentry_offset %p %lld (%p %p)\n", dn, di->offset, 850 dn->d_u.d_child.prev, dn->d_u.d_child.next); 851 spin_unlock(&dn->d_lock); 852 spin_unlock(&dcache_lock); 853 } 854 855 /* 856 * Incorporate results into the local cache. This is either just 857 * one inode, or a directory, dentry, and possibly linked-to inode (e.g., 858 * after a lookup). 859 * 860 * A reply may contain 861 * a directory inode along with a dentry. 862 * and/or a target inode 863 * 864 * Called with snap_rwsem (read). 865 */ 866 int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req, 867 struct ceph_mds_session *session) 868 { 869 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info; 870 struct inode *in = NULL; 871 struct ceph_mds_reply_inode *ininfo; 872 struct ceph_vino vino; 873 int i = 0; 874 int err = 0; 875 876 dout("fill_trace %p is_dentry %d is_target %d\n", req, 877 rinfo->head->is_dentry, rinfo->head->is_target); 878 879 #if 0 880 /* 881 * Debugging hook: 882 * 883 * If we resend completed ops to a recovering mds, we get no 884 * trace. Since that is very rare, pretend this is the case 885 * to ensure the 'no trace' handlers in the callers behave. 886 * 887 * Fill in inodes unconditionally to avoid breaking cap 888 * invariants. 889 */ 890 if (rinfo->head->op & CEPH_MDS_OP_WRITE) { 891 pr_info("fill_trace faking empty trace on %lld %s\n", 892 req->r_tid, ceph_mds_op_name(rinfo->head->op)); 893 if (rinfo->head->is_dentry) { 894 rinfo->head->is_dentry = 0; 895 err = fill_inode(req->r_locked_dir, 896 &rinfo->diri, rinfo->dirfrag, 897 session, req->r_request_started, -1); 898 } 899 if (rinfo->head->is_target) { 900 rinfo->head->is_target = 0; 901 ininfo = rinfo->targeti.in; 902 vino.ino = le64_to_cpu(ininfo->ino); 903 vino.snap = le64_to_cpu(ininfo->snapid); 904 in = ceph_get_inode(sb, vino); 905 err = fill_inode(in, &rinfo->targeti, NULL, 906 session, req->r_request_started, 907 req->r_fmode); 908 iput(in); 909 } 910 } 911 #endif 912 913 if (!rinfo->head->is_target && !rinfo->head->is_dentry) { 914 dout("fill_trace reply is empty!\n"); 915 if (rinfo->head->result == 0 && req->r_locked_dir) { 916 struct ceph_inode_info *ci = 917 ceph_inode(req->r_locked_dir); 918 dout(" clearing %p complete (empty trace)\n", 919 req->r_locked_dir); 920 ci->i_ceph_flags &= ~CEPH_I_COMPLETE; 921 ci->i_release_count++; 922 } 923 return 0; 924 } 925 926 if (rinfo->head->is_dentry) { 927 struct inode *dir = req->r_locked_dir; 928 929 err = fill_inode(dir, &rinfo->diri, rinfo->dirfrag, 930 session, req->r_request_started, -1, 931 &req->r_caps_reservation); 932 if (err < 0) 933 return err; 934 } 935 936 if (rinfo->head->is_dentry && !req->r_aborted) { 937 /* 938 * lookup link rename : null -> possibly existing inode 939 * mknod symlink mkdir : null -> new inode 940 * unlink : linked -> null 941 */ 942 struct inode *dir = req->r_locked_dir; 943 struct dentry *dn = req->r_dentry; 944 bool have_dir_cap, have_lease; 945 946 BUG_ON(!dn); 947 BUG_ON(!dir); 948 BUG_ON(dn->d_parent->d_inode != dir); 949 BUG_ON(ceph_ino(dir) != 950 le64_to_cpu(rinfo->diri.in->ino)); 951 BUG_ON(ceph_snap(dir) != 952 le64_to_cpu(rinfo->diri.in->snapid)); 953 954 /* do we have a lease on the whole dir? */ 955 have_dir_cap = 956 (le32_to_cpu(rinfo->diri.in->cap.caps) & 957 CEPH_CAP_FILE_SHARED); 958 959 /* do we have a dn lease? */ 960 have_lease = have_dir_cap || 961 (le16_to_cpu(rinfo->dlease->mask) & 962 CEPH_LOCK_DN); 963 964 if (!have_lease) 965 dout("fill_trace no dentry lease or dir cap\n"); 966 967 /* rename? */ 968 if (req->r_old_dentry && req->r_op == CEPH_MDS_OP_RENAME) { 969 dout(" src %p '%.*s' dst %p '%.*s'\n", 970 req->r_old_dentry, 971 req->r_old_dentry->d_name.len, 972 req->r_old_dentry->d_name.name, 973 dn, dn->d_name.len, dn->d_name.name); 974 dout("fill_trace doing d_move %p -> %p\n", 975 req->r_old_dentry, dn); 976 d_move(req->r_old_dentry, dn); 977 dout(" src %p '%.*s' dst %p '%.*s'\n", 978 req->r_old_dentry, 979 req->r_old_dentry->d_name.len, 980 req->r_old_dentry->d_name.name, 981 dn, dn->d_name.len, dn->d_name.name); 982 /* ensure target dentry is invalidated, despite 983 rehashing bug in vfs_rename_dir */ 984 dn->d_time = jiffies; 985 ceph_dentry(dn)->lease_shared_gen = 0; 986 /* take overwritten dentry's readdir offset */ 987 ceph_dentry(req->r_old_dentry)->offset = 988 ceph_dentry(dn)->offset; 989 dn = req->r_old_dentry; /* use old_dentry */ 990 in = dn->d_inode; 991 } 992 993 /* null dentry? */ 994 if (!rinfo->head->is_target) { 995 dout("fill_trace null dentry\n"); 996 if (dn->d_inode) { 997 dout("d_delete %p\n", dn); 998 d_delete(dn); 999 } else { 1000 dout("d_instantiate %p NULL\n", dn); 1001 d_instantiate(dn, NULL); 1002 if (have_lease && d_unhashed(dn)) 1003 d_rehash(dn); 1004 update_dentry_lease(dn, rinfo->dlease, 1005 session, 1006 req->r_request_started); 1007 } 1008 goto done; 1009 } 1010 1011 /* attach proper inode */ 1012 ininfo = rinfo->targeti.in; 1013 vino.ino = le64_to_cpu(ininfo->ino); 1014 vino.snap = le64_to_cpu(ininfo->snapid); 1015 if (!dn->d_inode) { 1016 in = ceph_get_inode(sb, vino); 1017 if (IS_ERR(in)) { 1018 pr_err("fill_trace bad get_inode " 1019 "%llx.%llx\n", vino.ino, vino.snap); 1020 err = PTR_ERR(in); 1021 d_delete(dn); 1022 goto done; 1023 } 1024 dn = splice_dentry(dn, in, &have_lease); 1025 if (IS_ERR(dn)) { 1026 err = PTR_ERR(dn); 1027 goto done; 1028 } 1029 req->r_dentry = dn; /* may have spliced */ 1030 ceph_set_dentry_offset(dn); 1031 igrab(in); 1032 } else if (ceph_ino(in) == vino.ino && 1033 ceph_snap(in) == vino.snap) { 1034 igrab(in); 1035 } else { 1036 dout(" %p links to %p %llx.%llx, not %llx.%llx\n", 1037 dn, in, ceph_ino(in), ceph_snap(in), 1038 vino.ino, vino.snap); 1039 have_lease = false; 1040 in = NULL; 1041 } 1042 1043 if (have_lease) 1044 update_dentry_lease(dn, rinfo->dlease, session, 1045 req->r_request_started); 1046 dout(" final dn %p\n", dn); 1047 i++; 1048 } else if (req->r_op == CEPH_MDS_OP_LOOKUPSNAP || 1049 req->r_op == CEPH_MDS_OP_MKSNAP) { 1050 struct dentry *dn = req->r_dentry; 1051 1052 /* fill out a snapdir LOOKUPSNAP dentry */ 1053 BUG_ON(!dn); 1054 BUG_ON(!req->r_locked_dir); 1055 BUG_ON(ceph_snap(req->r_locked_dir) != CEPH_SNAPDIR); 1056 ininfo = rinfo->targeti.in; 1057 vino.ino = le64_to_cpu(ininfo->ino); 1058 vino.snap = le64_to_cpu(ininfo->snapid); 1059 in = ceph_get_inode(sb, vino); 1060 if (IS_ERR(in)) { 1061 pr_err("fill_inode get_inode badness %llx.%llx\n", 1062 vino.ino, vino.snap); 1063 err = PTR_ERR(in); 1064 d_delete(dn); 1065 goto done; 1066 } 1067 dout(" linking snapped dir %p to dn %p\n", in, dn); 1068 dn = splice_dentry(dn, in, NULL); 1069 if (IS_ERR(dn)) { 1070 err = PTR_ERR(dn); 1071 goto done; 1072 } 1073 ceph_set_dentry_offset(dn); 1074 req->r_dentry = dn; /* may have spliced */ 1075 igrab(in); 1076 rinfo->head->is_dentry = 1; /* fool notrace handlers */ 1077 } 1078 1079 if (rinfo->head->is_target) { 1080 vino.ino = le64_to_cpu(rinfo->targeti.in->ino); 1081 vino.snap = le64_to_cpu(rinfo->targeti.in->snapid); 1082 1083 if (in == NULL || ceph_ino(in) != vino.ino || 1084 ceph_snap(in) != vino.snap) { 1085 in = ceph_get_inode(sb, vino); 1086 if (IS_ERR(in)) { 1087 err = PTR_ERR(in); 1088 goto done; 1089 } 1090 } 1091 req->r_target_inode = in; 1092 1093 err = fill_inode(in, 1094 &rinfo->targeti, NULL, 1095 session, req->r_request_started, 1096 (le32_to_cpu(rinfo->head->result) == 0) ? 1097 req->r_fmode : -1, 1098 &req->r_caps_reservation); 1099 if (err < 0) { 1100 pr_err("fill_inode badness %p %llx.%llx\n", 1101 in, ceph_vinop(in)); 1102 goto done; 1103 } 1104 } 1105 1106 done: 1107 dout("fill_trace done err=%d\n", err); 1108 return err; 1109 } 1110 1111 /* 1112 * Prepopulate our cache with readdir results, leases, etc. 1113 */ 1114 int ceph_readdir_prepopulate(struct ceph_mds_request *req, 1115 struct ceph_mds_session *session) 1116 { 1117 struct dentry *parent = req->r_dentry; 1118 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info; 1119 struct qstr dname; 1120 struct dentry *dn; 1121 struct inode *in; 1122 int err = 0, i; 1123 struct inode *snapdir = NULL; 1124 struct ceph_mds_request_head *rhead = req->r_request->front.iov_base; 1125 u64 frag = le32_to_cpu(rhead->args.readdir.frag); 1126 struct ceph_dentry_info *di; 1127 1128 if (le32_to_cpu(rinfo->head->op) == CEPH_MDS_OP_LSSNAP) { 1129 snapdir = ceph_get_snapdir(parent->d_inode); 1130 parent = d_find_alias(snapdir); 1131 dout("readdir_prepopulate %d items under SNAPDIR dn %p\n", 1132 rinfo->dir_nr, parent); 1133 } else { 1134 dout("readdir_prepopulate %d items under dn %p\n", 1135 rinfo->dir_nr, parent); 1136 if (rinfo->dir_dir) 1137 ceph_fill_dirfrag(parent->d_inode, rinfo->dir_dir); 1138 } 1139 1140 for (i = 0; i < rinfo->dir_nr; i++) { 1141 struct ceph_vino vino; 1142 1143 dname.name = rinfo->dir_dname[i]; 1144 dname.len = rinfo->dir_dname_len[i]; 1145 dname.hash = full_name_hash(dname.name, dname.len); 1146 1147 vino.ino = le64_to_cpu(rinfo->dir_in[i].in->ino); 1148 vino.snap = le64_to_cpu(rinfo->dir_in[i].in->snapid); 1149 1150 retry_lookup: 1151 dn = d_lookup(parent, &dname); 1152 dout("d_lookup on parent=%p name=%.*s got %p\n", 1153 parent, dname.len, dname.name, dn); 1154 1155 if (!dn) { 1156 dn = d_alloc(parent, &dname); 1157 dout("d_alloc %p '%.*s' = %p\n", parent, 1158 dname.len, dname.name, dn); 1159 if (dn == NULL) { 1160 dout("d_alloc badness\n"); 1161 err = -ENOMEM; 1162 goto out; 1163 } 1164 err = ceph_init_dentry(dn); 1165 if (err < 0) 1166 goto out; 1167 } else if (dn->d_inode && 1168 (ceph_ino(dn->d_inode) != vino.ino || 1169 ceph_snap(dn->d_inode) != vino.snap)) { 1170 dout(" dn %p points to wrong inode %p\n", 1171 dn, dn->d_inode); 1172 d_delete(dn); 1173 dput(dn); 1174 goto retry_lookup; 1175 } else { 1176 /* reorder parent's d_subdirs */ 1177 spin_lock(&dcache_lock); 1178 spin_lock(&dn->d_lock); 1179 list_move(&dn->d_u.d_child, &parent->d_subdirs); 1180 spin_unlock(&dn->d_lock); 1181 spin_unlock(&dcache_lock); 1182 } 1183 1184 di = dn->d_fsdata; 1185 di->offset = ceph_make_fpos(frag, i + req->r_readdir_offset); 1186 1187 /* inode */ 1188 if (dn->d_inode) { 1189 in = dn->d_inode; 1190 } else { 1191 in = ceph_get_inode(parent->d_sb, vino); 1192 if (in == NULL) { 1193 dout("new_inode badness\n"); 1194 d_delete(dn); 1195 dput(dn); 1196 err = -ENOMEM; 1197 goto out; 1198 } 1199 dn = splice_dentry(dn, in, NULL); 1200 } 1201 1202 if (fill_inode(in, &rinfo->dir_in[i], NULL, session, 1203 req->r_request_started, -1, 1204 &req->r_caps_reservation) < 0) { 1205 pr_err("fill_inode badness on %p\n", in); 1206 dput(dn); 1207 continue; 1208 } 1209 update_dentry_lease(dn, rinfo->dir_dlease[i], 1210 req->r_session, req->r_request_started); 1211 dput(dn); 1212 } 1213 req->r_did_prepopulate = true; 1214 1215 out: 1216 if (snapdir) { 1217 iput(snapdir); 1218 dput(parent); 1219 } 1220 dout("readdir_prepopulate done\n"); 1221 return err; 1222 } 1223 1224 int ceph_inode_set_size(struct inode *inode, loff_t size) 1225 { 1226 struct ceph_inode_info *ci = ceph_inode(inode); 1227 int ret = 0; 1228 1229 spin_lock(&inode->i_lock); 1230 dout("set_size %p %llu -> %llu\n", inode, inode->i_size, size); 1231 inode->i_size = size; 1232 inode->i_blocks = (size + (1 << 9) - 1) >> 9; 1233 1234 /* tell the MDS if we are approaching max_size */ 1235 if ((size << 1) >= ci->i_max_size && 1236 (ci->i_reported_size << 1) < ci->i_max_size) 1237 ret = 1; 1238 1239 spin_unlock(&inode->i_lock); 1240 return ret; 1241 } 1242 1243 /* 1244 * Write back inode data in a worker thread. (This can't be done 1245 * in the message handler context.) 1246 */ 1247 void ceph_queue_writeback(struct inode *inode) 1248 { 1249 if (queue_work(ceph_inode_to_client(inode)->wb_wq, 1250 &ceph_inode(inode)->i_wb_work)) { 1251 dout("ceph_queue_writeback %p\n", inode); 1252 igrab(inode); 1253 } else { 1254 dout("ceph_queue_writeback %p failed\n", inode); 1255 } 1256 } 1257 1258 static void ceph_writeback_work(struct work_struct *work) 1259 { 1260 struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info, 1261 i_wb_work); 1262 struct inode *inode = &ci->vfs_inode; 1263 1264 dout("writeback %p\n", inode); 1265 filemap_fdatawrite(&inode->i_data); 1266 iput(inode); 1267 } 1268 1269 /* 1270 * queue an async invalidation 1271 */ 1272 void ceph_queue_invalidate(struct inode *inode) 1273 { 1274 if (queue_work(ceph_inode_to_client(inode)->pg_inv_wq, 1275 &ceph_inode(inode)->i_pg_inv_work)) { 1276 dout("ceph_queue_invalidate %p\n", inode); 1277 igrab(inode); 1278 } else { 1279 dout("ceph_queue_invalidate %p failed\n", inode); 1280 } 1281 } 1282 1283 /* 1284 * invalidate any pages that are not dirty or under writeback. this 1285 * includes pages that are clean and mapped. 1286 */ 1287 static void ceph_invalidate_nondirty_pages(struct address_space *mapping) 1288 { 1289 struct pagevec pvec; 1290 pgoff_t next = 0; 1291 int i; 1292 1293 pagevec_init(&pvec, 0); 1294 while (pagevec_lookup(&pvec, mapping, next, PAGEVEC_SIZE)) { 1295 for (i = 0; i < pagevec_count(&pvec); i++) { 1296 struct page *page = pvec.pages[i]; 1297 pgoff_t index; 1298 int skip_page = 1299 (PageDirty(page) || PageWriteback(page)); 1300 1301 if (!skip_page) 1302 skip_page = !trylock_page(page); 1303 1304 /* 1305 * We really shouldn't be looking at the ->index of an 1306 * unlocked page. But we're not allowed to lock these 1307 * pages. So we rely upon nobody altering the ->index 1308 * of this (pinned-by-us) page. 1309 */ 1310 index = page->index; 1311 if (index > next) 1312 next = index; 1313 next++; 1314 1315 if (skip_page) 1316 continue; 1317 1318 generic_error_remove_page(mapping, page); 1319 unlock_page(page); 1320 } 1321 pagevec_release(&pvec); 1322 cond_resched(); 1323 } 1324 } 1325 1326 /* 1327 * Invalidate inode pages in a worker thread. (This can't be done 1328 * in the message handler context.) 1329 */ 1330 static void ceph_invalidate_work(struct work_struct *work) 1331 { 1332 struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info, 1333 i_pg_inv_work); 1334 struct inode *inode = &ci->vfs_inode; 1335 u32 orig_gen; 1336 int check = 0; 1337 1338 spin_lock(&inode->i_lock); 1339 dout("invalidate_pages %p gen %d revoking %d\n", inode, 1340 ci->i_rdcache_gen, ci->i_rdcache_revoking); 1341 if (ci->i_rdcache_gen == 0 || 1342 ci->i_rdcache_revoking != ci->i_rdcache_gen) { 1343 BUG_ON(ci->i_rdcache_revoking > ci->i_rdcache_gen); 1344 /* nevermind! */ 1345 ci->i_rdcache_revoking = 0; 1346 spin_unlock(&inode->i_lock); 1347 goto out; 1348 } 1349 orig_gen = ci->i_rdcache_gen; 1350 spin_unlock(&inode->i_lock); 1351 1352 ceph_invalidate_nondirty_pages(inode->i_mapping); 1353 1354 spin_lock(&inode->i_lock); 1355 if (orig_gen == ci->i_rdcache_gen) { 1356 dout("invalidate_pages %p gen %d successful\n", inode, 1357 ci->i_rdcache_gen); 1358 ci->i_rdcache_gen = 0; 1359 ci->i_rdcache_revoking = 0; 1360 check = 1; 1361 } else { 1362 dout("invalidate_pages %p gen %d raced, gen now %d\n", 1363 inode, orig_gen, ci->i_rdcache_gen); 1364 } 1365 spin_unlock(&inode->i_lock); 1366 1367 if (check) 1368 ceph_check_caps(ci, 0, NULL); 1369 out: 1370 iput(inode); 1371 } 1372 1373 1374 /* 1375 * called by trunc_wq; take i_mutex ourselves 1376 * 1377 * We also truncate in a separate thread as well. 1378 */ 1379 static void ceph_vmtruncate_work(struct work_struct *work) 1380 { 1381 struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info, 1382 i_vmtruncate_work); 1383 struct inode *inode = &ci->vfs_inode; 1384 1385 dout("vmtruncate_work %p\n", inode); 1386 mutex_lock(&inode->i_mutex); 1387 __ceph_do_pending_vmtruncate(inode); 1388 mutex_unlock(&inode->i_mutex); 1389 iput(inode); 1390 } 1391 1392 /* 1393 * Queue an async vmtruncate. If we fail to queue work, we will handle 1394 * the truncation the next time we call __ceph_do_pending_vmtruncate. 1395 */ 1396 void ceph_queue_vmtruncate(struct inode *inode) 1397 { 1398 struct ceph_inode_info *ci = ceph_inode(inode); 1399 1400 if (queue_work(ceph_client(inode->i_sb)->trunc_wq, 1401 &ci->i_vmtruncate_work)) { 1402 dout("ceph_queue_vmtruncate %p\n", inode); 1403 igrab(inode); 1404 } else { 1405 dout("ceph_queue_vmtruncate %p failed, pending=%d\n", 1406 inode, ci->i_truncate_pending); 1407 } 1408 } 1409 1410 /* 1411 * called with i_mutex held. 1412 * 1413 * Make sure any pending truncation is applied before doing anything 1414 * that may depend on it. 1415 */ 1416 void __ceph_do_pending_vmtruncate(struct inode *inode) 1417 { 1418 struct ceph_inode_info *ci = ceph_inode(inode); 1419 u64 to; 1420 int wrbuffer_refs, wake = 0; 1421 1422 retry: 1423 spin_lock(&inode->i_lock); 1424 if (ci->i_truncate_pending == 0) { 1425 dout("__do_pending_vmtruncate %p none pending\n", inode); 1426 spin_unlock(&inode->i_lock); 1427 return; 1428 } 1429 1430 /* 1431 * make sure any dirty snapped pages are flushed before we 1432 * possibly truncate them.. so write AND block! 1433 */ 1434 if (ci->i_wrbuffer_ref_head < ci->i_wrbuffer_ref) { 1435 dout("__do_pending_vmtruncate %p flushing snaps first\n", 1436 inode); 1437 spin_unlock(&inode->i_lock); 1438 filemap_write_and_wait_range(&inode->i_data, 0, 1439 inode->i_sb->s_maxbytes); 1440 goto retry; 1441 } 1442 1443 to = ci->i_truncate_size; 1444 wrbuffer_refs = ci->i_wrbuffer_ref; 1445 dout("__do_pending_vmtruncate %p (%d) to %lld\n", inode, 1446 ci->i_truncate_pending, to); 1447 spin_unlock(&inode->i_lock); 1448 1449 truncate_inode_pages(inode->i_mapping, to); 1450 1451 spin_lock(&inode->i_lock); 1452 ci->i_truncate_pending--; 1453 if (ci->i_truncate_pending == 0) 1454 wake = 1; 1455 spin_unlock(&inode->i_lock); 1456 1457 if (wrbuffer_refs == 0) 1458 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL); 1459 if (wake) 1460 wake_up(&ci->i_cap_wq); 1461 } 1462 1463 1464 /* 1465 * symlinks 1466 */ 1467 static void *ceph_sym_follow_link(struct dentry *dentry, struct nameidata *nd) 1468 { 1469 struct ceph_inode_info *ci = ceph_inode(dentry->d_inode); 1470 nd_set_link(nd, ci->i_symlink); 1471 return NULL; 1472 } 1473 1474 static const struct inode_operations ceph_symlink_iops = { 1475 .readlink = generic_readlink, 1476 .follow_link = ceph_sym_follow_link, 1477 }; 1478 1479 /* 1480 * setattr 1481 */ 1482 int ceph_setattr(struct dentry *dentry, struct iattr *attr) 1483 { 1484 struct inode *inode = dentry->d_inode; 1485 struct ceph_inode_info *ci = ceph_inode(inode); 1486 struct inode *parent_inode = dentry->d_parent->d_inode; 1487 const unsigned int ia_valid = attr->ia_valid; 1488 struct ceph_mds_request *req; 1489 struct ceph_mds_client *mdsc = &ceph_client(dentry->d_sb)->mdsc; 1490 int issued; 1491 int release = 0, dirtied = 0; 1492 int mask = 0; 1493 int err = 0; 1494 1495 if (ceph_snap(inode) != CEPH_NOSNAP) 1496 return -EROFS; 1497 1498 __ceph_do_pending_vmtruncate(inode); 1499 1500 err = inode_change_ok(inode, attr); 1501 if (err != 0) 1502 return err; 1503 1504 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETATTR, 1505 USE_AUTH_MDS); 1506 if (IS_ERR(req)) 1507 return PTR_ERR(req); 1508 1509 spin_lock(&inode->i_lock); 1510 issued = __ceph_caps_issued(ci, NULL); 1511 dout("setattr %p issued %s\n", inode, ceph_cap_string(issued)); 1512 1513 if (ia_valid & ATTR_UID) { 1514 dout("setattr %p uid %d -> %d\n", inode, 1515 inode->i_uid, attr->ia_uid); 1516 if (issued & CEPH_CAP_AUTH_EXCL) { 1517 inode->i_uid = attr->ia_uid; 1518 dirtied |= CEPH_CAP_AUTH_EXCL; 1519 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 || 1520 attr->ia_uid != inode->i_uid) { 1521 req->r_args.setattr.uid = cpu_to_le32(attr->ia_uid); 1522 mask |= CEPH_SETATTR_UID; 1523 release |= CEPH_CAP_AUTH_SHARED; 1524 } 1525 } 1526 if (ia_valid & ATTR_GID) { 1527 dout("setattr %p gid %d -> %d\n", inode, 1528 inode->i_gid, attr->ia_gid); 1529 if (issued & CEPH_CAP_AUTH_EXCL) { 1530 inode->i_gid = attr->ia_gid; 1531 dirtied |= CEPH_CAP_AUTH_EXCL; 1532 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 || 1533 attr->ia_gid != inode->i_gid) { 1534 req->r_args.setattr.gid = cpu_to_le32(attr->ia_gid); 1535 mask |= CEPH_SETATTR_GID; 1536 release |= CEPH_CAP_AUTH_SHARED; 1537 } 1538 } 1539 if (ia_valid & ATTR_MODE) { 1540 dout("setattr %p mode 0%o -> 0%o\n", inode, inode->i_mode, 1541 attr->ia_mode); 1542 if (issued & CEPH_CAP_AUTH_EXCL) { 1543 inode->i_mode = attr->ia_mode; 1544 dirtied |= CEPH_CAP_AUTH_EXCL; 1545 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 || 1546 attr->ia_mode != inode->i_mode) { 1547 req->r_args.setattr.mode = cpu_to_le32(attr->ia_mode); 1548 mask |= CEPH_SETATTR_MODE; 1549 release |= CEPH_CAP_AUTH_SHARED; 1550 } 1551 } 1552 1553 if (ia_valid & ATTR_ATIME) { 1554 dout("setattr %p atime %ld.%ld -> %ld.%ld\n", inode, 1555 inode->i_atime.tv_sec, inode->i_atime.tv_nsec, 1556 attr->ia_atime.tv_sec, attr->ia_atime.tv_nsec); 1557 if (issued & CEPH_CAP_FILE_EXCL) { 1558 ci->i_time_warp_seq++; 1559 inode->i_atime = attr->ia_atime; 1560 dirtied |= CEPH_CAP_FILE_EXCL; 1561 } else if ((issued & CEPH_CAP_FILE_WR) && 1562 timespec_compare(&inode->i_atime, 1563 &attr->ia_atime) < 0) { 1564 inode->i_atime = attr->ia_atime; 1565 dirtied |= CEPH_CAP_FILE_WR; 1566 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 || 1567 !timespec_equal(&inode->i_atime, &attr->ia_atime)) { 1568 ceph_encode_timespec(&req->r_args.setattr.atime, 1569 &attr->ia_atime); 1570 mask |= CEPH_SETATTR_ATIME; 1571 release |= CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_RD | 1572 CEPH_CAP_FILE_WR; 1573 } 1574 } 1575 if (ia_valid & ATTR_MTIME) { 1576 dout("setattr %p mtime %ld.%ld -> %ld.%ld\n", inode, 1577 inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec, 1578 attr->ia_mtime.tv_sec, attr->ia_mtime.tv_nsec); 1579 if (issued & CEPH_CAP_FILE_EXCL) { 1580 ci->i_time_warp_seq++; 1581 inode->i_mtime = attr->ia_mtime; 1582 dirtied |= CEPH_CAP_FILE_EXCL; 1583 } else if ((issued & CEPH_CAP_FILE_WR) && 1584 timespec_compare(&inode->i_mtime, 1585 &attr->ia_mtime) < 0) { 1586 inode->i_mtime = attr->ia_mtime; 1587 dirtied |= CEPH_CAP_FILE_WR; 1588 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 || 1589 !timespec_equal(&inode->i_mtime, &attr->ia_mtime)) { 1590 ceph_encode_timespec(&req->r_args.setattr.mtime, 1591 &attr->ia_mtime); 1592 mask |= CEPH_SETATTR_MTIME; 1593 release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD | 1594 CEPH_CAP_FILE_WR; 1595 } 1596 } 1597 if (ia_valid & ATTR_SIZE) { 1598 dout("setattr %p size %lld -> %lld\n", inode, 1599 inode->i_size, attr->ia_size); 1600 if (attr->ia_size > inode->i_sb->s_maxbytes) { 1601 err = -EINVAL; 1602 goto out; 1603 } 1604 if ((issued & CEPH_CAP_FILE_EXCL) && 1605 attr->ia_size > inode->i_size) { 1606 inode->i_size = attr->ia_size; 1607 inode->i_blocks = 1608 (attr->ia_size + (1 << 9) - 1) >> 9; 1609 inode->i_ctime = attr->ia_ctime; 1610 ci->i_reported_size = attr->ia_size; 1611 dirtied |= CEPH_CAP_FILE_EXCL; 1612 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 || 1613 attr->ia_size != inode->i_size) { 1614 req->r_args.setattr.size = cpu_to_le64(attr->ia_size); 1615 req->r_args.setattr.old_size = 1616 cpu_to_le64(inode->i_size); 1617 mask |= CEPH_SETATTR_SIZE; 1618 release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD | 1619 CEPH_CAP_FILE_WR; 1620 } 1621 } 1622 1623 /* these do nothing */ 1624 if (ia_valid & ATTR_CTIME) { 1625 bool only = (ia_valid & (ATTR_SIZE|ATTR_MTIME|ATTR_ATIME| 1626 ATTR_MODE|ATTR_UID|ATTR_GID)) == 0; 1627 dout("setattr %p ctime %ld.%ld -> %ld.%ld (%s)\n", inode, 1628 inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec, 1629 attr->ia_ctime.tv_sec, attr->ia_ctime.tv_nsec, 1630 only ? "ctime only" : "ignored"); 1631 inode->i_ctime = attr->ia_ctime; 1632 if (only) { 1633 /* 1634 * if kernel wants to dirty ctime but nothing else, 1635 * we need to choose a cap to dirty under, or do 1636 * a almost-no-op setattr 1637 */ 1638 if (issued & CEPH_CAP_AUTH_EXCL) 1639 dirtied |= CEPH_CAP_AUTH_EXCL; 1640 else if (issued & CEPH_CAP_FILE_EXCL) 1641 dirtied |= CEPH_CAP_FILE_EXCL; 1642 else if (issued & CEPH_CAP_XATTR_EXCL) 1643 dirtied |= CEPH_CAP_XATTR_EXCL; 1644 else 1645 mask |= CEPH_SETATTR_CTIME; 1646 } 1647 } 1648 if (ia_valid & ATTR_FILE) 1649 dout("setattr %p ATTR_FILE ... hrm!\n", inode); 1650 1651 if (dirtied) { 1652 __ceph_mark_dirty_caps(ci, dirtied); 1653 inode->i_ctime = CURRENT_TIME; 1654 } 1655 1656 release &= issued; 1657 spin_unlock(&inode->i_lock); 1658 1659 if (mask) { 1660 req->r_inode = igrab(inode); 1661 req->r_inode_drop = release; 1662 req->r_args.setattr.mask = cpu_to_le32(mask); 1663 req->r_num_caps = 1; 1664 err = ceph_mdsc_do_request(mdsc, parent_inode, req); 1665 } 1666 dout("setattr %p result=%d (%s locally, %d remote)\n", inode, err, 1667 ceph_cap_string(dirtied), mask); 1668 1669 ceph_mdsc_put_request(req); 1670 __ceph_do_pending_vmtruncate(inode); 1671 return err; 1672 out: 1673 spin_unlock(&inode->i_lock); 1674 ceph_mdsc_put_request(req); 1675 return err; 1676 } 1677 1678 /* 1679 * Verify that we have a lease on the given mask. If not, 1680 * do a getattr against an mds. 1681 */ 1682 int ceph_do_getattr(struct inode *inode, int mask) 1683 { 1684 struct ceph_client *client = ceph_sb_to_client(inode->i_sb); 1685 struct ceph_mds_client *mdsc = &client->mdsc; 1686 struct ceph_mds_request *req; 1687 int err; 1688 1689 if (ceph_snap(inode) == CEPH_SNAPDIR) { 1690 dout("do_getattr inode %p SNAPDIR\n", inode); 1691 return 0; 1692 } 1693 1694 dout("do_getattr inode %p mask %s\n", inode, ceph_cap_string(mask)); 1695 if (ceph_caps_issued_mask(ceph_inode(inode), mask, 1)) 1696 return 0; 1697 1698 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS); 1699 if (IS_ERR(req)) 1700 return PTR_ERR(req); 1701 req->r_inode = igrab(inode); 1702 req->r_num_caps = 1; 1703 req->r_args.getattr.mask = cpu_to_le32(mask); 1704 err = ceph_mdsc_do_request(mdsc, NULL, req); 1705 ceph_mdsc_put_request(req); 1706 dout("do_getattr result=%d\n", err); 1707 return err; 1708 } 1709 1710 1711 /* 1712 * Check inode permissions. We verify we have a valid value for 1713 * the AUTH cap, then call the generic handler. 1714 */ 1715 int ceph_permission(struct inode *inode, int mask) 1716 { 1717 int err = ceph_do_getattr(inode, CEPH_CAP_AUTH_SHARED); 1718 1719 if (!err) 1720 err = generic_permission(inode, mask, NULL); 1721 return err; 1722 } 1723 1724 /* 1725 * Get all attributes. Hopefully somedata we'll have a statlite() 1726 * and can limit the fields we require to be accurate. 1727 */ 1728 int ceph_getattr(struct vfsmount *mnt, struct dentry *dentry, 1729 struct kstat *stat) 1730 { 1731 struct inode *inode = dentry->d_inode; 1732 struct ceph_inode_info *ci = ceph_inode(inode); 1733 int err; 1734 1735 err = ceph_do_getattr(inode, CEPH_STAT_CAP_INODE_ALL); 1736 if (!err) { 1737 generic_fillattr(inode, stat); 1738 stat->ino = inode->i_ino; 1739 if (ceph_snap(inode) != CEPH_NOSNAP) 1740 stat->dev = ceph_snap(inode); 1741 else 1742 stat->dev = 0; 1743 if (S_ISDIR(inode->i_mode)) { 1744 stat->size = ci->i_rbytes; 1745 stat->blocks = 0; 1746 stat->blksize = 65536; 1747 } 1748 } 1749 return err; 1750 } 1751