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