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