1 // SPDX-License-Identifier: GPL-2.0 2 #include <linux/ceph/ceph_debug.h> 3 4 #include <linux/module.h> 5 #include <linux/fs.h> 6 #include <linux/slab.h> 7 #include <linux/string.h> 8 #include <linux/uaccess.h> 9 #include <linux/kernel.h> 10 #include <linux/writeback.h> 11 #include <linux/vmalloc.h> 12 #include <linux/xattr.h> 13 #include <linux/posix_acl.h> 14 #include <linux/random.h> 15 #include <linux/sort.h> 16 #include <linux/iversion.h> 17 #include <linux/fscrypt.h> 18 19 #include "super.h" 20 #include "mds_client.h" 21 #include "cache.h" 22 #include "crypto.h" 23 #include <linux/ceph/decode.h> 24 25 /* 26 * Ceph inode operations 27 * 28 * Implement basic inode helpers (get, alloc) and inode ops (getattr, 29 * setattr, etc.), xattr helpers, and helpers for assimilating 30 * metadata returned by the MDS into our cache. 31 * 32 * Also define helpers for doing asynchronous writeback, invalidation, 33 * and truncation for the benefit of those who can't afford to block 34 * (typically because they are in the message handler path). 35 */ 36 37 static const struct inode_operations ceph_symlink_iops; 38 static const struct inode_operations ceph_encrypted_symlink_iops; 39 40 static void ceph_inode_work(struct work_struct *work); 41 42 /* 43 * find or create an inode, given the ceph ino number 44 */ 45 static int ceph_set_ino_cb(struct inode *inode, void *data) 46 { 47 struct ceph_inode_info *ci = ceph_inode(inode); 48 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb); 49 50 ci->i_vino = *(struct ceph_vino *)data; 51 inode->i_ino = ceph_vino_to_ino_t(ci->i_vino); 52 inode_set_iversion_raw(inode, 0); 53 percpu_counter_inc(&mdsc->metric.total_inodes); 54 55 return 0; 56 } 57 58 /** 59 * ceph_new_inode - allocate a new inode in advance of an expected create 60 * @dir: parent directory for new inode 61 * @dentry: dentry that may eventually point to new inode 62 * @mode: mode of new inode 63 * @as_ctx: pointer to inherited security context 64 * 65 * Allocate a new inode in advance of an operation to create a new inode. 66 * This allocates the inode and sets up the acl_sec_ctx with appropriate 67 * info for the new inode. 68 * 69 * Returns a pointer to the new inode or an ERR_PTR. 70 */ 71 struct inode *ceph_new_inode(struct inode *dir, struct dentry *dentry, 72 umode_t *mode, struct ceph_acl_sec_ctx *as_ctx) 73 { 74 int err; 75 struct inode *inode; 76 77 inode = new_inode(dir->i_sb); 78 if (!inode) 79 return ERR_PTR(-ENOMEM); 80 81 inode->i_blkbits = CEPH_FSCRYPT_BLOCK_SHIFT; 82 83 if (!S_ISLNK(*mode)) { 84 err = ceph_pre_init_acls(dir, mode, as_ctx); 85 if (err < 0) 86 goto out_err; 87 } 88 89 inode->i_state = 0; 90 inode->i_mode = *mode; 91 92 err = ceph_security_init_secctx(dentry, *mode, as_ctx); 93 if (err < 0) 94 goto out_err; 95 96 /* 97 * We'll skip setting fscrypt context for snapshots, leaving that for 98 * the handle_reply(). 99 */ 100 if (ceph_snap(dir) != CEPH_SNAPDIR) { 101 err = ceph_fscrypt_prepare_context(dir, inode, as_ctx); 102 if (err) 103 goto out_err; 104 } 105 106 return inode; 107 out_err: 108 iput(inode); 109 return ERR_PTR(err); 110 } 111 112 void ceph_as_ctx_to_req(struct ceph_mds_request *req, 113 struct ceph_acl_sec_ctx *as_ctx) 114 { 115 if (as_ctx->pagelist) { 116 req->r_pagelist = as_ctx->pagelist; 117 as_ctx->pagelist = NULL; 118 } 119 ceph_fscrypt_as_ctx_to_req(req, as_ctx); 120 } 121 122 /** 123 * ceph_get_inode - find or create/hash a new inode 124 * @sb: superblock to search and allocate in 125 * @vino: vino to search for 126 * @newino: optional new inode to insert if one isn't found (may be NULL) 127 * 128 * Search for or insert a new inode into the hash for the given vino, and 129 * return a reference to it. If new is non-NULL, its reference is consumed. 130 */ 131 struct inode *ceph_get_inode(struct super_block *sb, struct ceph_vino vino, 132 struct inode *newino) 133 { 134 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(sb); 135 struct ceph_client *cl = mdsc->fsc->client; 136 struct inode *inode; 137 138 if (ceph_vino_is_reserved(vino)) 139 return ERR_PTR(-EREMOTEIO); 140 141 if (newino) { 142 inode = inode_insert5(newino, (unsigned long)vino.ino, 143 ceph_ino_compare, ceph_set_ino_cb, &vino); 144 if (inode != newino) 145 iput(newino); 146 } else { 147 inode = iget5_locked(sb, (unsigned long)vino.ino, 148 ceph_ino_compare, ceph_set_ino_cb, &vino); 149 } 150 151 if (!inode) { 152 doutc(cl, "no inode found for %llx.%llx\n", vino.ino, vino.snap); 153 return ERR_PTR(-ENOMEM); 154 } 155 156 doutc(cl, "on %llx=%llx.%llx got %p new %d\n", 157 ceph_present_inode(inode), ceph_vinop(inode), inode, 158 !!(inode->i_state & I_NEW)); 159 return inode; 160 } 161 162 /* 163 * get/constuct snapdir inode for a given directory 164 */ 165 struct inode *ceph_get_snapdir(struct inode *parent) 166 { 167 struct ceph_client *cl = ceph_inode_to_client(parent); 168 struct ceph_vino vino = { 169 .ino = ceph_ino(parent), 170 .snap = CEPH_SNAPDIR, 171 }; 172 struct inode *inode = ceph_get_inode(parent->i_sb, vino, NULL); 173 struct ceph_inode_info *ci = ceph_inode(inode); 174 int ret = -ENOTDIR; 175 176 if (IS_ERR(inode)) 177 return inode; 178 179 if (!S_ISDIR(parent->i_mode)) { 180 pr_warn_once_client(cl, "bad snapdir parent type (mode=0%o)\n", 181 parent->i_mode); 182 goto err; 183 } 184 185 if (!(inode->i_state & I_NEW) && !S_ISDIR(inode->i_mode)) { 186 pr_warn_once_client(cl, "bad snapdir inode type (mode=0%o)\n", 187 inode->i_mode); 188 goto err; 189 } 190 191 inode->i_mode = parent->i_mode; 192 inode->i_uid = parent->i_uid; 193 inode->i_gid = parent->i_gid; 194 inode_set_mtime_to_ts(inode, inode_get_mtime(parent)); 195 inode_set_ctime_to_ts(inode, inode_get_ctime(parent)); 196 inode_set_atime_to_ts(inode, inode_get_atime(parent)); 197 ci->i_rbytes = 0; 198 ci->i_btime = ceph_inode(parent)->i_btime; 199 200 #ifdef CONFIG_FS_ENCRYPTION 201 /* if encrypted, just borrow fscrypt_auth from parent */ 202 if (IS_ENCRYPTED(parent)) { 203 struct ceph_inode_info *pci = ceph_inode(parent); 204 205 ci->fscrypt_auth = kmemdup(pci->fscrypt_auth, 206 pci->fscrypt_auth_len, 207 GFP_KERNEL); 208 if (ci->fscrypt_auth) { 209 inode->i_flags |= S_ENCRYPTED; 210 ci->fscrypt_auth_len = pci->fscrypt_auth_len; 211 } else { 212 doutc(cl, "Failed to alloc snapdir fscrypt_auth\n"); 213 ret = -ENOMEM; 214 goto err; 215 } 216 } 217 #endif 218 if (inode->i_state & I_NEW) { 219 inode->i_op = &ceph_snapdir_iops; 220 inode->i_fop = &ceph_snapdir_fops; 221 ci->i_snap_caps = CEPH_CAP_PIN; /* so we can open */ 222 unlock_new_inode(inode); 223 } 224 225 return inode; 226 err: 227 if ((inode->i_state & I_NEW)) 228 discard_new_inode(inode); 229 else 230 iput(inode); 231 return ERR_PTR(ret); 232 } 233 234 const struct inode_operations ceph_file_iops = { 235 .permission = ceph_permission, 236 .setattr = ceph_setattr, 237 .getattr = ceph_getattr, 238 .listxattr = ceph_listxattr, 239 .get_inode_acl = ceph_get_acl, 240 .set_acl = ceph_set_acl, 241 }; 242 243 244 /* 245 * We use a 'frag tree' to keep track of the MDS's directory fragments 246 * for a given inode (usually there is just a single fragment). We 247 * need to know when a child frag is delegated to a new MDS, or when 248 * it is flagged as replicated, so we can direct our requests 249 * accordingly. 250 */ 251 252 /* 253 * find/create a frag in the tree 254 */ 255 static struct ceph_inode_frag *__get_or_create_frag(struct ceph_inode_info *ci, 256 u32 f) 257 { 258 struct inode *inode = &ci->netfs.inode; 259 struct ceph_client *cl = ceph_inode_to_client(inode); 260 struct rb_node **p; 261 struct rb_node *parent = NULL; 262 struct ceph_inode_frag *frag; 263 int c; 264 265 p = &ci->i_fragtree.rb_node; 266 while (*p) { 267 parent = *p; 268 frag = rb_entry(parent, struct ceph_inode_frag, node); 269 c = ceph_frag_compare(f, frag->frag); 270 if (c < 0) 271 p = &(*p)->rb_left; 272 else if (c > 0) 273 p = &(*p)->rb_right; 274 else 275 return frag; 276 } 277 278 frag = kmalloc(sizeof(*frag), GFP_NOFS); 279 if (!frag) 280 return ERR_PTR(-ENOMEM); 281 282 frag->frag = f; 283 frag->split_by = 0; 284 frag->mds = -1; 285 frag->ndist = 0; 286 287 rb_link_node(&frag->node, parent, p); 288 rb_insert_color(&frag->node, &ci->i_fragtree); 289 290 doutc(cl, "added %p %llx.%llx frag %x\n", inode, ceph_vinop(inode), f); 291 return frag; 292 } 293 294 /* 295 * find a specific frag @f 296 */ 297 struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci, u32 f) 298 { 299 struct rb_node *n = ci->i_fragtree.rb_node; 300 301 while (n) { 302 struct ceph_inode_frag *frag = 303 rb_entry(n, struct ceph_inode_frag, node); 304 int c = ceph_frag_compare(f, frag->frag); 305 if (c < 0) 306 n = n->rb_left; 307 else if (c > 0) 308 n = n->rb_right; 309 else 310 return frag; 311 } 312 return NULL; 313 } 314 315 /* 316 * Choose frag containing the given value @v. If @pfrag is 317 * specified, copy the frag delegation info to the caller if 318 * it is present. 319 */ 320 static u32 __ceph_choose_frag(struct ceph_inode_info *ci, u32 v, 321 struct ceph_inode_frag *pfrag, int *found) 322 { 323 struct ceph_client *cl = ceph_inode_to_client(&ci->netfs.inode); 324 u32 t = ceph_frag_make(0, 0); 325 struct ceph_inode_frag *frag; 326 unsigned nway, i; 327 u32 n; 328 329 if (found) 330 *found = 0; 331 332 while (1) { 333 WARN_ON(!ceph_frag_contains_value(t, v)); 334 frag = __ceph_find_frag(ci, t); 335 if (!frag) 336 break; /* t is a leaf */ 337 if (frag->split_by == 0) { 338 if (pfrag) 339 memcpy(pfrag, frag, sizeof(*pfrag)); 340 if (found) 341 *found = 1; 342 break; 343 } 344 345 /* choose child */ 346 nway = 1 << frag->split_by; 347 doutc(cl, "frag(%x) %x splits by %d (%d ways)\n", v, t, 348 frag->split_by, nway); 349 for (i = 0; i < nway; i++) { 350 n = ceph_frag_make_child(t, frag->split_by, i); 351 if (ceph_frag_contains_value(n, v)) { 352 t = n; 353 break; 354 } 355 } 356 BUG_ON(i == nway); 357 } 358 doutc(cl, "frag(%x) = %x\n", v, t); 359 360 return t; 361 } 362 363 u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v, 364 struct ceph_inode_frag *pfrag, int *found) 365 { 366 u32 ret; 367 mutex_lock(&ci->i_fragtree_mutex); 368 ret = __ceph_choose_frag(ci, v, pfrag, found); 369 mutex_unlock(&ci->i_fragtree_mutex); 370 return ret; 371 } 372 373 /* 374 * Process dirfrag (delegation) info from the mds. Include leaf 375 * fragment in tree ONLY if ndist > 0. Otherwise, only 376 * branches/splits are included in i_fragtree) 377 */ 378 static int ceph_fill_dirfrag(struct inode *inode, 379 struct ceph_mds_reply_dirfrag *dirinfo) 380 { 381 struct ceph_inode_info *ci = ceph_inode(inode); 382 struct ceph_client *cl = ceph_inode_to_client(inode); 383 struct ceph_inode_frag *frag; 384 u32 id = le32_to_cpu(dirinfo->frag); 385 int mds = le32_to_cpu(dirinfo->auth); 386 int ndist = le32_to_cpu(dirinfo->ndist); 387 int diri_auth = -1; 388 int i; 389 int err = 0; 390 391 spin_lock(&ci->i_ceph_lock); 392 if (ci->i_auth_cap) 393 diri_auth = ci->i_auth_cap->mds; 394 spin_unlock(&ci->i_ceph_lock); 395 396 if (mds == -1) /* CDIR_AUTH_PARENT */ 397 mds = diri_auth; 398 399 mutex_lock(&ci->i_fragtree_mutex); 400 if (ndist == 0 && mds == diri_auth) { 401 /* no delegation info needed. */ 402 frag = __ceph_find_frag(ci, id); 403 if (!frag) 404 goto out; 405 if (frag->split_by == 0) { 406 /* tree leaf, remove */ 407 doutc(cl, "removed %p %llx.%llx frag %x (no ref)\n", 408 inode, ceph_vinop(inode), id); 409 rb_erase(&frag->node, &ci->i_fragtree); 410 kfree(frag); 411 } else { 412 /* tree branch, keep and clear */ 413 doutc(cl, "cleared %p %llx.%llx frag %x referral\n", 414 inode, ceph_vinop(inode), id); 415 frag->mds = -1; 416 frag->ndist = 0; 417 } 418 goto out; 419 } 420 421 422 /* find/add this frag to store mds delegation info */ 423 frag = __get_or_create_frag(ci, id); 424 if (IS_ERR(frag)) { 425 /* this is not the end of the world; we can continue 426 with bad/inaccurate delegation info */ 427 pr_err_client(cl, "ENOMEM on mds ref %p %llx.%llx fg %x\n", 428 inode, ceph_vinop(inode), 429 le32_to_cpu(dirinfo->frag)); 430 err = -ENOMEM; 431 goto out; 432 } 433 434 frag->mds = mds; 435 frag->ndist = min_t(u32, ndist, CEPH_MAX_DIRFRAG_REP); 436 for (i = 0; i < frag->ndist; i++) 437 frag->dist[i] = le32_to_cpu(dirinfo->dist[i]); 438 doutc(cl, "%p %llx.%llx frag %x ndist=%d\n", inode, 439 ceph_vinop(inode), frag->frag, frag->ndist); 440 441 out: 442 mutex_unlock(&ci->i_fragtree_mutex); 443 return err; 444 } 445 446 static int frag_tree_split_cmp(const void *l, const void *r) 447 { 448 struct ceph_frag_tree_split *ls = (struct ceph_frag_tree_split*)l; 449 struct ceph_frag_tree_split *rs = (struct ceph_frag_tree_split*)r; 450 return ceph_frag_compare(le32_to_cpu(ls->frag), 451 le32_to_cpu(rs->frag)); 452 } 453 454 static bool is_frag_child(u32 f, struct ceph_inode_frag *frag) 455 { 456 if (!frag) 457 return f == ceph_frag_make(0, 0); 458 if (ceph_frag_bits(f) != ceph_frag_bits(frag->frag) + frag->split_by) 459 return false; 460 return ceph_frag_contains_value(frag->frag, ceph_frag_value(f)); 461 } 462 463 static int ceph_fill_fragtree(struct inode *inode, 464 struct ceph_frag_tree_head *fragtree, 465 struct ceph_mds_reply_dirfrag *dirinfo) 466 { 467 struct ceph_client *cl = ceph_inode_to_client(inode); 468 struct ceph_inode_info *ci = ceph_inode(inode); 469 struct ceph_inode_frag *frag, *prev_frag = NULL; 470 struct rb_node *rb_node; 471 unsigned i, split_by, nsplits; 472 u32 id; 473 bool update = false; 474 475 mutex_lock(&ci->i_fragtree_mutex); 476 nsplits = le32_to_cpu(fragtree->nsplits); 477 if (nsplits != ci->i_fragtree_nsplits) { 478 update = true; 479 } else if (nsplits) { 480 i = get_random_u32_below(nsplits); 481 id = le32_to_cpu(fragtree->splits[i].frag); 482 if (!__ceph_find_frag(ci, id)) 483 update = true; 484 } else if (!RB_EMPTY_ROOT(&ci->i_fragtree)) { 485 rb_node = rb_first(&ci->i_fragtree); 486 frag = rb_entry(rb_node, struct ceph_inode_frag, node); 487 if (frag->frag != ceph_frag_make(0, 0) || rb_next(rb_node)) 488 update = true; 489 } 490 if (!update && dirinfo) { 491 id = le32_to_cpu(dirinfo->frag); 492 if (id != __ceph_choose_frag(ci, id, NULL, NULL)) 493 update = true; 494 } 495 if (!update) 496 goto out_unlock; 497 498 if (nsplits > 1) { 499 sort(fragtree->splits, nsplits, sizeof(fragtree->splits[0]), 500 frag_tree_split_cmp, NULL); 501 } 502 503 doutc(cl, "%p %llx.%llx\n", inode, ceph_vinop(inode)); 504 rb_node = rb_first(&ci->i_fragtree); 505 for (i = 0; i < nsplits; i++) { 506 id = le32_to_cpu(fragtree->splits[i].frag); 507 split_by = le32_to_cpu(fragtree->splits[i].by); 508 if (split_by == 0 || ceph_frag_bits(id) + split_by > 24) { 509 pr_err_client(cl, "%p %llx.%llx invalid split %d/%u, " 510 "frag %x split by %d\n", inode, 511 ceph_vinop(inode), i, nsplits, id, split_by); 512 continue; 513 } 514 frag = NULL; 515 while (rb_node) { 516 frag = rb_entry(rb_node, struct ceph_inode_frag, node); 517 if (ceph_frag_compare(frag->frag, id) >= 0) { 518 if (frag->frag != id) 519 frag = NULL; 520 else 521 rb_node = rb_next(rb_node); 522 break; 523 } 524 rb_node = rb_next(rb_node); 525 /* delete stale split/leaf node */ 526 if (frag->split_by > 0 || 527 !is_frag_child(frag->frag, prev_frag)) { 528 rb_erase(&frag->node, &ci->i_fragtree); 529 if (frag->split_by > 0) 530 ci->i_fragtree_nsplits--; 531 kfree(frag); 532 } 533 frag = NULL; 534 } 535 if (!frag) { 536 frag = __get_or_create_frag(ci, id); 537 if (IS_ERR(frag)) 538 continue; 539 } 540 if (frag->split_by == 0) 541 ci->i_fragtree_nsplits++; 542 frag->split_by = split_by; 543 doutc(cl, " frag %x split by %d\n", frag->frag, frag->split_by); 544 prev_frag = frag; 545 } 546 while (rb_node) { 547 frag = rb_entry(rb_node, struct ceph_inode_frag, node); 548 rb_node = rb_next(rb_node); 549 /* delete stale split/leaf node */ 550 if (frag->split_by > 0 || 551 !is_frag_child(frag->frag, prev_frag)) { 552 rb_erase(&frag->node, &ci->i_fragtree); 553 if (frag->split_by > 0) 554 ci->i_fragtree_nsplits--; 555 kfree(frag); 556 } 557 } 558 out_unlock: 559 mutex_unlock(&ci->i_fragtree_mutex); 560 return 0; 561 } 562 563 /* 564 * initialize a newly allocated inode. 565 */ 566 struct inode *ceph_alloc_inode(struct super_block *sb) 567 { 568 struct ceph_fs_client *fsc = ceph_sb_to_fs_client(sb); 569 struct ceph_inode_info *ci; 570 int i; 571 572 ci = alloc_inode_sb(sb, ceph_inode_cachep, GFP_NOFS); 573 if (!ci) 574 return NULL; 575 576 doutc(fsc->client, "%p\n", &ci->netfs.inode); 577 578 /* Set parameters for the netfs library */ 579 netfs_inode_init(&ci->netfs, &ceph_netfs_ops, false); 580 581 spin_lock_init(&ci->i_ceph_lock); 582 583 ci->i_version = 0; 584 ci->i_inline_version = 0; 585 ci->i_time_warp_seq = 0; 586 ci->i_ceph_flags = 0; 587 atomic64_set(&ci->i_ordered_count, 1); 588 atomic64_set(&ci->i_release_count, 1); 589 atomic64_set(&ci->i_complete_seq[0], 0); 590 atomic64_set(&ci->i_complete_seq[1], 0); 591 ci->i_symlink = NULL; 592 593 ci->i_max_bytes = 0; 594 ci->i_max_files = 0; 595 596 memset(&ci->i_dir_layout, 0, sizeof(ci->i_dir_layout)); 597 memset(&ci->i_cached_layout, 0, sizeof(ci->i_cached_layout)); 598 RCU_INIT_POINTER(ci->i_layout.pool_ns, NULL); 599 600 ci->i_fragtree = RB_ROOT; 601 mutex_init(&ci->i_fragtree_mutex); 602 603 ci->i_xattrs.blob = NULL; 604 ci->i_xattrs.prealloc_blob = NULL; 605 ci->i_xattrs.dirty = false; 606 ci->i_xattrs.index = RB_ROOT; 607 ci->i_xattrs.count = 0; 608 ci->i_xattrs.names_size = 0; 609 ci->i_xattrs.vals_size = 0; 610 ci->i_xattrs.version = 0; 611 ci->i_xattrs.index_version = 0; 612 613 ci->i_caps = RB_ROOT; 614 ci->i_auth_cap = NULL; 615 ci->i_dirty_caps = 0; 616 ci->i_flushing_caps = 0; 617 INIT_LIST_HEAD(&ci->i_dirty_item); 618 INIT_LIST_HEAD(&ci->i_flushing_item); 619 ci->i_prealloc_cap_flush = NULL; 620 INIT_LIST_HEAD(&ci->i_cap_flush_list); 621 init_waitqueue_head(&ci->i_cap_wq); 622 ci->i_hold_caps_max = 0; 623 INIT_LIST_HEAD(&ci->i_cap_delay_list); 624 INIT_LIST_HEAD(&ci->i_cap_snaps); 625 ci->i_head_snapc = NULL; 626 ci->i_snap_caps = 0; 627 628 ci->i_last_rd = ci->i_last_wr = jiffies - 3600 * HZ; 629 for (i = 0; i < CEPH_FILE_MODE_BITS; i++) 630 ci->i_nr_by_mode[i] = 0; 631 632 mutex_init(&ci->i_truncate_mutex); 633 ci->i_truncate_seq = 0; 634 ci->i_truncate_size = 0; 635 ci->i_truncate_pending = 0; 636 ci->i_truncate_pagecache_size = 0; 637 638 ci->i_max_size = 0; 639 ci->i_reported_size = 0; 640 ci->i_wanted_max_size = 0; 641 ci->i_requested_max_size = 0; 642 643 ci->i_pin_ref = 0; 644 ci->i_rd_ref = 0; 645 ci->i_rdcache_ref = 0; 646 ci->i_wr_ref = 0; 647 ci->i_wb_ref = 0; 648 ci->i_fx_ref = 0; 649 ci->i_wrbuffer_ref = 0; 650 ci->i_wrbuffer_ref_head = 0; 651 atomic_set(&ci->i_filelock_ref, 0); 652 atomic_set(&ci->i_shared_gen, 1); 653 ci->i_rdcache_gen = 0; 654 ci->i_rdcache_revoking = 0; 655 656 INIT_LIST_HEAD(&ci->i_unsafe_dirops); 657 INIT_LIST_HEAD(&ci->i_unsafe_iops); 658 spin_lock_init(&ci->i_unsafe_lock); 659 660 ci->i_snap_realm = NULL; 661 INIT_LIST_HEAD(&ci->i_snap_realm_item); 662 INIT_LIST_HEAD(&ci->i_snap_flush_item); 663 664 INIT_WORK(&ci->i_work, ceph_inode_work); 665 ci->i_work_mask = 0; 666 memset(&ci->i_btime, '\0', sizeof(ci->i_btime)); 667 #ifdef CONFIG_FS_ENCRYPTION 668 ci->fscrypt_auth = NULL; 669 ci->fscrypt_auth_len = 0; 670 #endif 671 return &ci->netfs.inode; 672 } 673 674 void ceph_free_inode(struct inode *inode) 675 { 676 struct ceph_inode_info *ci = ceph_inode(inode); 677 678 kfree(ci->i_symlink); 679 #ifdef CONFIG_FS_ENCRYPTION 680 kfree(ci->fscrypt_auth); 681 #endif 682 fscrypt_free_inode(inode); 683 kmem_cache_free(ceph_inode_cachep, ci); 684 } 685 686 void ceph_evict_inode(struct inode *inode) 687 { 688 struct ceph_inode_info *ci = ceph_inode(inode); 689 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb); 690 struct ceph_client *cl = ceph_inode_to_client(inode); 691 struct ceph_inode_frag *frag; 692 struct rb_node *n; 693 694 doutc(cl, "%p ino %llx.%llx\n", inode, ceph_vinop(inode)); 695 696 percpu_counter_dec(&mdsc->metric.total_inodes); 697 698 netfs_wait_for_outstanding_io(inode); 699 truncate_inode_pages_final(&inode->i_data); 700 if (inode->i_state & I_PINNING_NETFS_WB) 701 ceph_fscache_unuse_cookie(inode, true); 702 clear_inode(inode); 703 704 ceph_fscache_unregister_inode_cookie(ci); 705 fscrypt_put_encryption_info(inode); 706 707 __ceph_remove_caps(ci); 708 709 if (__ceph_has_quota(ci, QUOTA_GET_ANY)) 710 ceph_adjust_quota_realms_count(inode, false); 711 712 /* 713 * we may still have a snap_realm reference if there are stray 714 * caps in i_snap_caps. 715 */ 716 if (ci->i_snap_realm) { 717 if (ceph_snap(inode) == CEPH_NOSNAP) { 718 doutc(cl, " dropping residual ref to snap realm %p\n", 719 ci->i_snap_realm); 720 ceph_change_snap_realm(inode, NULL); 721 } else { 722 ceph_put_snapid_map(mdsc, ci->i_snapid_map); 723 ci->i_snap_realm = NULL; 724 } 725 } 726 727 while ((n = rb_first(&ci->i_fragtree)) != NULL) { 728 frag = rb_entry(n, struct ceph_inode_frag, node); 729 rb_erase(n, &ci->i_fragtree); 730 kfree(frag); 731 } 732 ci->i_fragtree_nsplits = 0; 733 734 __ceph_destroy_xattrs(ci); 735 if (ci->i_xattrs.blob) 736 ceph_buffer_put(ci->i_xattrs.blob); 737 if (ci->i_xattrs.prealloc_blob) 738 ceph_buffer_put(ci->i_xattrs.prealloc_blob); 739 740 ceph_put_string(rcu_dereference_raw(ci->i_layout.pool_ns)); 741 ceph_put_string(rcu_dereference_raw(ci->i_cached_layout.pool_ns)); 742 } 743 744 static inline blkcnt_t calc_inode_blocks(u64 size) 745 { 746 return (size + (1<<9) - 1) >> 9; 747 } 748 749 /* 750 * Helpers to fill in size, ctime, mtime, and atime. We have to be 751 * careful because either the client or MDS may have more up to date 752 * info, depending on which capabilities are held, and whether 753 * time_warp_seq or truncate_seq have increased. (Ordinarily, mtime 754 * and size are monotonically increasing, except when utimes() or 755 * truncate() increments the corresponding _seq values.) 756 */ 757 int ceph_fill_file_size(struct inode *inode, int issued, 758 u32 truncate_seq, u64 truncate_size, u64 size) 759 { 760 struct ceph_client *cl = ceph_inode_to_client(inode); 761 struct ceph_inode_info *ci = ceph_inode(inode); 762 int queue_trunc = 0; 763 loff_t isize = i_size_read(inode); 764 765 if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) > 0 || 766 (truncate_seq == ci->i_truncate_seq && size > isize)) { 767 doutc(cl, "size %lld -> %llu\n", isize, size); 768 if (size > 0 && S_ISDIR(inode->i_mode)) { 769 pr_err_client(cl, "non-zero size for directory\n"); 770 size = 0; 771 } 772 i_size_write(inode, size); 773 inode->i_blocks = calc_inode_blocks(size); 774 /* 775 * If we're expanding, then we should be able to just update 776 * the existing cookie. 777 */ 778 if (size > isize) 779 ceph_fscache_update(inode); 780 ci->i_reported_size = size; 781 if (truncate_seq != ci->i_truncate_seq) { 782 doutc(cl, "truncate_seq %u -> %u\n", 783 ci->i_truncate_seq, truncate_seq); 784 ci->i_truncate_seq = truncate_seq; 785 786 /* the MDS should have revoked these caps */ 787 WARN_ON_ONCE(issued & (CEPH_CAP_FILE_RD | 788 CEPH_CAP_FILE_LAZYIO)); 789 /* 790 * If we hold relevant caps, or in the case where we're 791 * not the only client referencing this file and we 792 * don't hold those caps, then we need to check whether 793 * the file is either opened or mmaped 794 */ 795 if ((issued & (CEPH_CAP_FILE_CACHE| 796 CEPH_CAP_FILE_BUFFER)) || 797 mapping_mapped(inode->i_mapping) || 798 __ceph_is_file_opened(ci)) { 799 ci->i_truncate_pending++; 800 queue_trunc = 1; 801 } 802 } 803 } 804 805 /* 806 * It's possible that the new sizes of the two consecutive 807 * size truncations will be in the same fscrypt last block, 808 * and we need to truncate the corresponding page caches 809 * anyway. 810 */ 811 if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) >= 0) { 812 doutc(cl, "truncate_size %lld -> %llu, encrypted %d\n", 813 ci->i_truncate_size, truncate_size, 814 !!IS_ENCRYPTED(inode)); 815 816 ci->i_truncate_size = truncate_size; 817 818 if (IS_ENCRYPTED(inode)) { 819 doutc(cl, "truncate_pagecache_size %lld -> %llu\n", 820 ci->i_truncate_pagecache_size, size); 821 ci->i_truncate_pagecache_size = size; 822 } else { 823 ci->i_truncate_pagecache_size = truncate_size; 824 } 825 } 826 return queue_trunc; 827 } 828 829 void ceph_fill_file_time(struct inode *inode, int issued, 830 u64 time_warp_seq, struct timespec64 *ctime, 831 struct timespec64 *mtime, struct timespec64 *atime) 832 { 833 struct ceph_client *cl = ceph_inode_to_client(inode); 834 struct ceph_inode_info *ci = ceph_inode(inode); 835 struct timespec64 ictime = inode_get_ctime(inode); 836 int warn = 0; 837 838 if (issued & (CEPH_CAP_FILE_EXCL| 839 CEPH_CAP_FILE_WR| 840 CEPH_CAP_FILE_BUFFER| 841 CEPH_CAP_AUTH_EXCL| 842 CEPH_CAP_XATTR_EXCL)) { 843 if (ci->i_version == 0 || 844 timespec64_compare(ctime, &ictime) > 0) { 845 doutc(cl, "ctime %lld.%09ld -> %lld.%09ld inc w/ cap\n", 846 ictime.tv_sec, ictime.tv_nsec, 847 ctime->tv_sec, ctime->tv_nsec); 848 inode_set_ctime_to_ts(inode, *ctime); 849 } 850 if (ci->i_version == 0 || 851 ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) > 0) { 852 /* the MDS did a utimes() */ 853 doutc(cl, "mtime %lld.%09ld -> %lld.%09ld tw %d -> %d\n", 854 inode_get_mtime_sec(inode), 855 inode_get_mtime_nsec(inode), 856 mtime->tv_sec, mtime->tv_nsec, 857 ci->i_time_warp_seq, (int)time_warp_seq); 858 859 inode_set_mtime_to_ts(inode, *mtime); 860 inode_set_atime_to_ts(inode, *atime); 861 ci->i_time_warp_seq = time_warp_seq; 862 } else if (time_warp_seq == ci->i_time_warp_seq) { 863 struct timespec64 ts; 864 865 /* nobody did utimes(); take the max */ 866 ts = inode_get_mtime(inode); 867 if (timespec64_compare(mtime, &ts) > 0) { 868 doutc(cl, "mtime %lld.%09ld -> %lld.%09ld inc\n", 869 ts.tv_sec, ts.tv_nsec, 870 mtime->tv_sec, mtime->tv_nsec); 871 inode_set_mtime_to_ts(inode, *mtime); 872 } 873 ts = inode_get_atime(inode); 874 if (timespec64_compare(atime, &ts) > 0) { 875 doutc(cl, "atime %lld.%09ld -> %lld.%09ld inc\n", 876 ts.tv_sec, ts.tv_nsec, 877 atime->tv_sec, atime->tv_nsec); 878 inode_set_atime_to_ts(inode, *atime); 879 } 880 } else if (issued & CEPH_CAP_FILE_EXCL) { 881 /* we did a utimes(); ignore mds values */ 882 } else { 883 warn = 1; 884 } 885 } else { 886 /* we have no write|excl caps; whatever the MDS says is true */ 887 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) >= 0) { 888 inode_set_ctime_to_ts(inode, *ctime); 889 inode_set_mtime_to_ts(inode, *mtime); 890 inode_set_atime_to_ts(inode, *atime); 891 ci->i_time_warp_seq = time_warp_seq; 892 } else { 893 warn = 1; 894 } 895 } 896 if (warn) /* time_warp_seq shouldn't go backwards */ 897 doutc(cl, "%p mds time_warp_seq %llu < %u\n", inode, 898 time_warp_seq, ci->i_time_warp_seq); 899 } 900 901 #if IS_ENABLED(CONFIG_FS_ENCRYPTION) 902 static int decode_encrypted_symlink(struct ceph_mds_client *mdsc, 903 const char *encsym, 904 int enclen, u8 **decsym) 905 { 906 struct ceph_client *cl = mdsc->fsc->client; 907 int declen; 908 u8 *sym; 909 910 sym = kmalloc(enclen + 1, GFP_NOFS); 911 if (!sym) 912 return -ENOMEM; 913 914 declen = ceph_base64_decode(encsym, enclen, sym); 915 if (declen < 0) { 916 pr_err_client(cl, 917 "can't decode symlink (%d). Content: %.*s\n", 918 declen, enclen, encsym); 919 kfree(sym); 920 return -EIO; 921 } 922 sym[declen + 1] = '\0'; 923 *decsym = sym; 924 return declen; 925 } 926 #else 927 static int decode_encrypted_symlink(struct ceph_mds_client *mdsc, 928 const char *encsym, 929 int symlen, u8 **decsym) 930 { 931 return -EOPNOTSUPP; 932 } 933 #endif 934 935 /* 936 * Populate an inode based on info from mds. May be called on new or 937 * existing inodes. 938 */ 939 int ceph_fill_inode(struct inode *inode, struct page *locked_page, 940 struct ceph_mds_reply_info_in *iinfo, 941 struct ceph_mds_reply_dirfrag *dirinfo, 942 struct ceph_mds_session *session, int cap_fmode, 943 struct ceph_cap_reservation *caps_reservation) 944 { 945 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb); 946 struct ceph_client *cl = mdsc->fsc->client; 947 struct ceph_mds_reply_inode *info = iinfo->in; 948 struct ceph_inode_info *ci = ceph_inode(inode); 949 int issued, new_issued, info_caps; 950 struct timespec64 mtime, atime, ctime; 951 struct ceph_buffer *xattr_blob = NULL; 952 struct ceph_buffer *old_blob = NULL; 953 struct ceph_string *pool_ns = NULL; 954 struct ceph_cap *new_cap = NULL; 955 int err = 0; 956 bool wake = false; 957 bool queue_trunc = false; 958 bool new_version = false; 959 bool fill_inline = false; 960 umode_t mode = le32_to_cpu(info->mode); 961 dev_t rdev = le32_to_cpu(info->rdev); 962 963 lockdep_assert_held(&mdsc->snap_rwsem); 964 965 doutc(cl, "%p ino %llx.%llx v %llu had %llu\n", inode, ceph_vinop(inode), 966 le64_to_cpu(info->version), ci->i_version); 967 968 /* Once I_NEW is cleared, we can't change type or dev numbers */ 969 if (inode->i_state & I_NEW) { 970 inode->i_mode = mode; 971 } else { 972 if (inode_wrong_type(inode, mode)) { 973 pr_warn_once_client(cl, 974 "inode type changed! (ino %llx.%llx is 0%o, mds says 0%o)\n", 975 ceph_vinop(inode), inode->i_mode, mode); 976 return -ESTALE; 977 } 978 979 if ((S_ISCHR(mode) || S_ISBLK(mode)) && inode->i_rdev != rdev) { 980 pr_warn_once_client(cl, 981 "dev inode rdev changed! (ino %llx.%llx is %u:%u, mds says %u:%u)\n", 982 ceph_vinop(inode), MAJOR(inode->i_rdev), 983 MINOR(inode->i_rdev), MAJOR(rdev), 984 MINOR(rdev)); 985 return -ESTALE; 986 } 987 } 988 989 info_caps = le32_to_cpu(info->cap.caps); 990 991 /* prealloc new cap struct */ 992 if (info_caps && ceph_snap(inode) == CEPH_NOSNAP) { 993 new_cap = ceph_get_cap(mdsc, caps_reservation); 994 if (!new_cap) 995 return -ENOMEM; 996 } 997 998 /* 999 * prealloc xattr data, if it looks like we'll need it. only 1000 * if len > 4 (meaning there are actually xattrs; the first 4 1001 * bytes are the xattr count). 1002 */ 1003 if (iinfo->xattr_len > 4) { 1004 xattr_blob = ceph_buffer_new(iinfo->xattr_len, GFP_NOFS); 1005 if (!xattr_blob) 1006 pr_err_client(cl, "ENOMEM xattr blob %d bytes\n", 1007 iinfo->xattr_len); 1008 } 1009 1010 if (iinfo->pool_ns_len > 0) 1011 pool_ns = ceph_find_or_create_string(iinfo->pool_ns_data, 1012 iinfo->pool_ns_len); 1013 1014 if (ceph_snap(inode) != CEPH_NOSNAP && !ci->i_snapid_map) 1015 ci->i_snapid_map = ceph_get_snapid_map(mdsc, ceph_snap(inode)); 1016 1017 spin_lock(&ci->i_ceph_lock); 1018 1019 /* 1020 * provided version will be odd if inode value is projected, 1021 * even if stable. skip the update if we have newer stable 1022 * info (ours>=theirs, e.g. due to racing mds replies), unless 1023 * we are getting projected (unstable) info (in which case the 1024 * version is odd, and we want ours>theirs). 1025 * us them 1026 * 2 2 skip 1027 * 3 2 skip 1028 * 3 3 update 1029 */ 1030 if (ci->i_version == 0 || 1031 ((info->cap.flags & CEPH_CAP_FLAG_AUTH) && 1032 le64_to_cpu(info->version) > (ci->i_version & ~1))) 1033 new_version = true; 1034 1035 /* Update change_attribute */ 1036 inode_set_max_iversion_raw(inode, iinfo->change_attr); 1037 1038 __ceph_caps_issued(ci, &issued); 1039 issued |= __ceph_caps_dirty(ci); 1040 new_issued = ~issued & info_caps; 1041 1042 __ceph_update_quota(ci, iinfo->max_bytes, iinfo->max_files); 1043 1044 #ifdef CONFIG_FS_ENCRYPTION 1045 if (iinfo->fscrypt_auth_len && 1046 ((inode->i_state & I_NEW) || (ci->fscrypt_auth_len == 0))) { 1047 kfree(ci->fscrypt_auth); 1048 ci->fscrypt_auth_len = iinfo->fscrypt_auth_len; 1049 ci->fscrypt_auth = iinfo->fscrypt_auth; 1050 iinfo->fscrypt_auth = NULL; 1051 iinfo->fscrypt_auth_len = 0; 1052 inode_set_flags(inode, S_ENCRYPTED, S_ENCRYPTED); 1053 } 1054 #endif 1055 1056 if ((new_version || (new_issued & CEPH_CAP_AUTH_SHARED)) && 1057 (issued & CEPH_CAP_AUTH_EXCL) == 0) { 1058 inode->i_mode = mode; 1059 inode->i_uid = make_kuid(&init_user_ns, le32_to_cpu(info->uid)); 1060 inode->i_gid = make_kgid(&init_user_ns, le32_to_cpu(info->gid)); 1061 doutc(cl, "%p %llx.%llx mode 0%o uid.gid %d.%d\n", inode, 1062 ceph_vinop(inode), inode->i_mode, 1063 from_kuid(&init_user_ns, inode->i_uid), 1064 from_kgid(&init_user_ns, inode->i_gid)); 1065 ceph_decode_timespec64(&ci->i_btime, &iinfo->btime); 1066 ceph_decode_timespec64(&ci->i_snap_btime, &iinfo->snap_btime); 1067 } 1068 1069 /* directories have fl_stripe_unit set to zero */ 1070 if (IS_ENCRYPTED(inode)) 1071 inode->i_blkbits = CEPH_FSCRYPT_BLOCK_SHIFT; 1072 else if (le32_to_cpu(info->layout.fl_stripe_unit)) 1073 inode->i_blkbits = 1074 fls(le32_to_cpu(info->layout.fl_stripe_unit)) - 1; 1075 else 1076 inode->i_blkbits = CEPH_BLOCK_SHIFT; 1077 1078 if ((new_version || (new_issued & CEPH_CAP_LINK_SHARED)) && 1079 (issued & CEPH_CAP_LINK_EXCL) == 0) 1080 set_nlink(inode, le32_to_cpu(info->nlink)); 1081 1082 if (new_version || (new_issued & CEPH_CAP_ANY_RD)) { 1083 /* be careful with mtime, atime, size */ 1084 ceph_decode_timespec64(&atime, &info->atime); 1085 ceph_decode_timespec64(&mtime, &info->mtime); 1086 ceph_decode_timespec64(&ctime, &info->ctime); 1087 ceph_fill_file_time(inode, issued, 1088 le32_to_cpu(info->time_warp_seq), 1089 &ctime, &mtime, &atime); 1090 } 1091 1092 if (new_version || (info_caps & CEPH_CAP_FILE_SHARED)) { 1093 ci->i_files = le64_to_cpu(info->files); 1094 ci->i_subdirs = le64_to_cpu(info->subdirs); 1095 } 1096 1097 if (new_version || 1098 (new_issued & (CEPH_CAP_ANY_FILE_RD | CEPH_CAP_ANY_FILE_WR))) { 1099 u64 size = le64_to_cpu(info->size); 1100 s64 old_pool = ci->i_layout.pool_id; 1101 struct ceph_string *old_ns; 1102 1103 ceph_file_layout_from_legacy(&ci->i_layout, &info->layout); 1104 old_ns = rcu_dereference_protected(ci->i_layout.pool_ns, 1105 lockdep_is_held(&ci->i_ceph_lock)); 1106 rcu_assign_pointer(ci->i_layout.pool_ns, pool_ns); 1107 1108 if (ci->i_layout.pool_id != old_pool || pool_ns != old_ns) 1109 ci->i_ceph_flags &= ~CEPH_I_POOL_PERM; 1110 1111 pool_ns = old_ns; 1112 1113 if (IS_ENCRYPTED(inode) && size && 1114 iinfo->fscrypt_file_len == sizeof(__le64)) { 1115 u64 fsize = __le64_to_cpu(*(__le64 *)iinfo->fscrypt_file); 1116 1117 if (size == round_up(fsize, CEPH_FSCRYPT_BLOCK_SIZE)) { 1118 size = fsize; 1119 } else { 1120 pr_warn_client(cl, 1121 "fscrypt size mismatch: size=%llu fscrypt_file=%llu, discarding fscrypt_file size.\n", 1122 info->size, size); 1123 } 1124 } 1125 1126 queue_trunc = ceph_fill_file_size(inode, issued, 1127 le32_to_cpu(info->truncate_seq), 1128 le64_to_cpu(info->truncate_size), 1129 size); 1130 /* only update max_size on auth cap */ 1131 if ((info->cap.flags & CEPH_CAP_FLAG_AUTH) && 1132 ci->i_max_size != le64_to_cpu(info->max_size)) { 1133 doutc(cl, "max_size %lld -> %llu\n", 1134 ci->i_max_size, le64_to_cpu(info->max_size)); 1135 ci->i_max_size = le64_to_cpu(info->max_size); 1136 } 1137 } 1138 1139 /* layout and rstat are not tracked by capability, update them if 1140 * the inode info is from auth mds */ 1141 if (new_version || (info->cap.flags & CEPH_CAP_FLAG_AUTH)) { 1142 if (S_ISDIR(inode->i_mode)) { 1143 ci->i_dir_layout = iinfo->dir_layout; 1144 ci->i_rbytes = le64_to_cpu(info->rbytes); 1145 ci->i_rfiles = le64_to_cpu(info->rfiles); 1146 ci->i_rsubdirs = le64_to_cpu(info->rsubdirs); 1147 ci->i_dir_pin = iinfo->dir_pin; 1148 ci->i_rsnaps = iinfo->rsnaps; 1149 ceph_decode_timespec64(&ci->i_rctime, &info->rctime); 1150 } 1151 } 1152 1153 /* xattrs */ 1154 /* note that if i_xattrs.len <= 4, i_xattrs.data will still be NULL. */ 1155 if ((ci->i_xattrs.version == 0 || !(issued & CEPH_CAP_XATTR_EXCL)) && 1156 le64_to_cpu(info->xattr_version) > ci->i_xattrs.version) { 1157 if (ci->i_xattrs.blob) 1158 old_blob = ci->i_xattrs.blob; 1159 ci->i_xattrs.blob = xattr_blob; 1160 if (xattr_blob) 1161 memcpy(ci->i_xattrs.blob->vec.iov_base, 1162 iinfo->xattr_data, iinfo->xattr_len); 1163 ci->i_xattrs.version = le64_to_cpu(info->xattr_version); 1164 ceph_forget_all_cached_acls(inode); 1165 ceph_security_invalidate_secctx(inode); 1166 xattr_blob = NULL; 1167 } 1168 1169 /* finally update i_version */ 1170 if (le64_to_cpu(info->version) > ci->i_version) 1171 ci->i_version = le64_to_cpu(info->version); 1172 1173 inode->i_mapping->a_ops = &ceph_aops; 1174 1175 switch (inode->i_mode & S_IFMT) { 1176 case S_IFIFO: 1177 case S_IFBLK: 1178 case S_IFCHR: 1179 case S_IFSOCK: 1180 inode->i_blkbits = PAGE_SHIFT; 1181 init_special_inode(inode, inode->i_mode, rdev); 1182 inode->i_op = &ceph_file_iops; 1183 break; 1184 case S_IFREG: 1185 inode->i_op = &ceph_file_iops; 1186 inode->i_fop = &ceph_file_fops; 1187 break; 1188 case S_IFLNK: 1189 if (!ci->i_symlink) { 1190 u32 symlen = iinfo->symlink_len; 1191 char *sym; 1192 1193 spin_unlock(&ci->i_ceph_lock); 1194 1195 if (IS_ENCRYPTED(inode)) { 1196 if (symlen != i_size_read(inode)) 1197 pr_err_client(cl, 1198 "%p %llx.%llx BAD symlink size %lld\n", 1199 inode, ceph_vinop(inode), 1200 i_size_read(inode)); 1201 1202 err = decode_encrypted_symlink(mdsc, iinfo->symlink, 1203 symlen, (u8 **)&sym); 1204 if (err < 0) { 1205 pr_err_client(cl, 1206 "decoding encrypted symlink failed: %d\n", 1207 err); 1208 goto out; 1209 } 1210 symlen = err; 1211 i_size_write(inode, symlen); 1212 inode->i_blocks = calc_inode_blocks(symlen); 1213 } else { 1214 if (symlen != i_size_read(inode)) { 1215 pr_err_client(cl, 1216 "%p %llx.%llx BAD symlink size %lld\n", 1217 inode, ceph_vinop(inode), 1218 i_size_read(inode)); 1219 i_size_write(inode, symlen); 1220 inode->i_blocks = calc_inode_blocks(symlen); 1221 } 1222 1223 err = -ENOMEM; 1224 sym = kstrndup(iinfo->symlink, symlen, GFP_NOFS); 1225 if (!sym) 1226 goto out; 1227 } 1228 1229 spin_lock(&ci->i_ceph_lock); 1230 if (!ci->i_symlink) 1231 ci->i_symlink = sym; 1232 else 1233 kfree(sym); /* lost a race */ 1234 } 1235 1236 if (IS_ENCRYPTED(inode)) { 1237 /* 1238 * Encrypted symlinks need to be decrypted before we can 1239 * cache their targets in i_link. Don't touch it here. 1240 */ 1241 inode->i_op = &ceph_encrypted_symlink_iops; 1242 } else { 1243 inode->i_link = ci->i_symlink; 1244 inode->i_op = &ceph_symlink_iops; 1245 } 1246 break; 1247 case S_IFDIR: 1248 inode->i_op = &ceph_dir_iops; 1249 inode->i_fop = &ceph_dir_fops; 1250 break; 1251 default: 1252 pr_err_client(cl, "%p %llx.%llx BAD mode 0%o\n", inode, 1253 ceph_vinop(inode), inode->i_mode); 1254 } 1255 1256 /* were we issued a capability? */ 1257 if (info_caps) { 1258 if (ceph_snap(inode) == CEPH_NOSNAP) { 1259 ceph_add_cap(inode, session, 1260 le64_to_cpu(info->cap.cap_id), 1261 info_caps, 1262 le32_to_cpu(info->cap.wanted), 1263 le32_to_cpu(info->cap.seq), 1264 le32_to_cpu(info->cap.mseq), 1265 le64_to_cpu(info->cap.realm), 1266 info->cap.flags, &new_cap); 1267 1268 /* set dir completion flag? */ 1269 if (S_ISDIR(inode->i_mode) && 1270 ci->i_files == 0 && ci->i_subdirs == 0 && 1271 (info_caps & CEPH_CAP_FILE_SHARED) && 1272 (issued & CEPH_CAP_FILE_EXCL) == 0 && 1273 !__ceph_dir_is_complete(ci)) { 1274 doutc(cl, " marking %p complete (empty)\n", 1275 inode); 1276 i_size_write(inode, 0); 1277 __ceph_dir_set_complete(ci, 1278 atomic64_read(&ci->i_release_count), 1279 atomic64_read(&ci->i_ordered_count)); 1280 } 1281 1282 wake = true; 1283 } else { 1284 doutc(cl, " %p got snap_caps %s\n", inode, 1285 ceph_cap_string(info_caps)); 1286 ci->i_snap_caps |= info_caps; 1287 } 1288 } 1289 1290 if (iinfo->inline_version > 0 && 1291 iinfo->inline_version >= ci->i_inline_version) { 1292 int cache_caps = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO; 1293 ci->i_inline_version = iinfo->inline_version; 1294 if (ceph_has_inline_data(ci) && 1295 (locked_page || (info_caps & cache_caps))) 1296 fill_inline = true; 1297 } 1298 1299 if (cap_fmode >= 0) { 1300 if (!info_caps) 1301 pr_warn_client(cl, "mds issued no caps on %llx.%llx\n", 1302 ceph_vinop(inode)); 1303 __ceph_touch_fmode(ci, mdsc, cap_fmode); 1304 } 1305 1306 spin_unlock(&ci->i_ceph_lock); 1307 1308 ceph_fscache_register_inode_cookie(inode); 1309 1310 if (fill_inline) 1311 ceph_fill_inline_data(inode, locked_page, 1312 iinfo->inline_data, iinfo->inline_len); 1313 1314 if (wake) 1315 wake_up_all(&ci->i_cap_wq); 1316 1317 /* queue truncate if we saw i_size decrease */ 1318 if (queue_trunc) 1319 ceph_queue_vmtruncate(inode); 1320 1321 /* populate frag tree */ 1322 if (S_ISDIR(inode->i_mode)) 1323 ceph_fill_fragtree(inode, &info->fragtree, dirinfo); 1324 1325 /* update delegation info? */ 1326 if (dirinfo) 1327 ceph_fill_dirfrag(inode, dirinfo); 1328 1329 err = 0; 1330 out: 1331 if (new_cap) 1332 ceph_put_cap(mdsc, new_cap); 1333 ceph_buffer_put(old_blob); 1334 ceph_buffer_put(xattr_blob); 1335 ceph_put_string(pool_ns); 1336 return err; 1337 } 1338 1339 /* 1340 * caller should hold session s_mutex and dentry->d_lock. 1341 */ 1342 static void __update_dentry_lease(struct inode *dir, struct dentry *dentry, 1343 struct ceph_mds_reply_lease *lease, 1344 struct ceph_mds_session *session, 1345 unsigned long from_time, 1346 struct ceph_mds_session **old_lease_session) 1347 { 1348 struct ceph_client *cl = ceph_inode_to_client(dir); 1349 struct ceph_dentry_info *di = ceph_dentry(dentry); 1350 unsigned mask = le16_to_cpu(lease->mask); 1351 long unsigned duration = le32_to_cpu(lease->duration_ms); 1352 long unsigned ttl = from_time + (duration * HZ) / 1000; 1353 long unsigned half_ttl = from_time + (duration * HZ / 2) / 1000; 1354 1355 doutc(cl, "%p duration %lu ms ttl %lu\n", dentry, duration, ttl); 1356 1357 /* only track leases on regular dentries */ 1358 if (ceph_snap(dir) != CEPH_NOSNAP) 1359 return; 1360 1361 if (mask & CEPH_LEASE_PRIMARY_LINK) 1362 di->flags |= CEPH_DENTRY_PRIMARY_LINK; 1363 else 1364 di->flags &= ~CEPH_DENTRY_PRIMARY_LINK; 1365 1366 di->lease_shared_gen = atomic_read(&ceph_inode(dir)->i_shared_gen); 1367 if (!(mask & CEPH_LEASE_VALID)) { 1368 __ceph_dentry_dir_lease_touch(di); 1369 return; 1370 } 1371 1372 if (di->lease_gen == atomic_read(&session->s_cap_gen) && 1373 time_before(ttl, di->time)) 1374 return; /* we already have a newer lease. */ 1375 1376 if (di->lease_session && di->lease_session != session) { 1377 *old_lease_session = di->lease_session; 1378 di->lease_session = NULL; 1379 } 1380 1381 if (!di->lease_session) 1382 di->lease_session = ceph_get_mds_session(session); 1383 di->lease_gen = atomic_read(&session->s_cap_gen); 1384 di->lease_seq = le32_to_cpu(lease->seq); 1385 di->lease_renew_after = half_ttl; 1386 di->lease_renew_from = 0; 1387 di->time = ttl; 1388 1389 __ceph_dentry_lease_touch(di); 1390 } 1391 1392 static inline void update_dentry_lease(struct inode *dir, struct dentry *dentry, 1393 struct ceph_mds_reply_lease *lease, 1394 struct ceph_mds_session *session, 1395 unsigned long from_time) 1396 { 1397 struct ceph_mds_session *old_lease_session = NULL; 1398 spin_lock(&dentry->d_lock); 1399 __update_dentry_lease(dir, dentry, lease, session, from_time, 1400 &old_lease_session); 1401 spin_unlock(&dentry->d_lock); 1402 ceph_put_mds_session(old_lease_session); 1403 } 1404 1405 /* 1406 * update dentry lease without having parent inode locked 1407 */ 1408 static void update_dentry_lease_careful(struct dentry *dentry, 1409 struct ceph_mds_reply_lease *lease, 1410 struct ceph_mds_session *session, 1411 unsigned long from_time, 1412 char *dname, u32 dname_len, 1413 struct ceph_vino *pdvino, 1414 struct ceph_vino *ptvino) 1415 1416 { 1417 struct inode *dir; 1418 struct ceph_mds_session *old_lease_session = NULL; 1419 1420 spin_lock(&dentry->d_lock); 1421 /* make sure dentry's name matches target */ 1422 if (dentry->d_name.len != dname_len || 1423 memcmp(dentry->d_name.name, dname, dname_len)) 1424 goto out_unlock; 1425 1426 dir = d_inode(dentry->d_parent); 1427 /* make sure parent matches dvino */ 1428 if (!ceph_ino_compare(dir, pdvino)) 1429 goto out_unlock; 1430 1431 /* make sure dentry's inode matches target. NULL ptvino means that 1432 * we expect a negative dentry */ 1433 if (ptvino) { 1434 if (d_really_is_negative(dentry)) 1435 goto out_unlock; 1436 if (!ceph_ino_compare(d_inode(dentry), ptvino)) 1437 goto out_unlock; 1438 } else { 1439 if (d_really_is_positive(dentry)) 1440 goto out_unlock; 1441 } 1442 1443 __update_dentry_lease(dir, dentry, lease, session, 1444 from_time, &old_lease_session); 1445 out_unlock: 1446 spin_unlock(&dentry->d_lock); 1447 ceph_put_mds_session(old_lease_session); 1448 } 1449 1450 /* 1451 * splice a dentry to an inode. 1452 * caller must hold directory i_rwsem for this to be safe. 1453 */ 1454 static int splice_dentry(struct dentry **pdn, struct inode *in) 1455 { 1456 struct ceph_client *cl = ceph_inode_to_client(in); 1457 struct dentry *dn = *pdn; 1458 struct dentry *realdn; 1459 1460 BUG_ON(d_inode(dn)); 1461 1462 if (S_ISDIR(in->i_mode)) { 1463 /* If inode is directory, d_splice_alias() below will remove 1464 * 'realdn' from its origin parent. We need to ensure that 1465 * origin parent's readdir cache will not reference 'realdn' 1466 */ 1467 realdn = d_find_any_alias(in); 1468 if (realdn) { 1469 struct ceph_dentry_info *di = ceph_dentry(realdn); 1470 spin_lock(&realdn->d_lock); 1471 1472 realdn->d_op->d_prune(realdn); 1473 1474 di->time = jiffies; 1475 di->lease_shared_gen = 0; 1476 di->offset = 0; 1477 1478 spin_unlock(&realdn->d_lock); 1479 dput(realdn); 1480 } 1481 } 1482 1483 /* dn must be unhashed */ 1484 if (!d_unhashed(dn)) 1485 d_drop(dn); 1486 realdn = d_splice_alias(in, dn); 1487 if (IS_ERR(realdn)) { 1488 pr_err_client(cl, "error %ld %p inode %p ino %llx.%llx\n", 1489 PTR_ERR(realdn), dn, in, ceph_vinop(in)); 1490 return PTR_ERR(realdn); 1491 } 1492 1493 if (realdn) { 1494 doutc(cl, "dn %p (%d) spliced with %p (%d) inode %p ino %llx.%llx\n", 1495 dn, d_count(dn), realdn, d_count(realdn), 1496 d_inode(realdn), ceph_vinop(d_inode(realdn))); 1497 dput(dn); 1498 *pdn = realdn; 1499 } else { 1500 BUG_ON(!ceph_dentry(dn)); 1501 doutc(cl, "dn %p attached to %p ino %llx.%llx\n", dn, 1502 d_inode(dn), ceph_vinop(d_inode(dn))); 1503 } 1504 return 0; 1505 } 1506 1507 /* 1508 * Incorporate results into the local cache. This is either just 1509 * one inode, or a directory, dentry, and possibly linked-to inode (e.g., 1510 * after a lookup). 1511 * 1512 * A reply may contain 1513 * a directory inode along with a dentry. 1514 * and/or a target inode 1515 * 1516 * Called with snap_rwsem (read). 1517 */ 1518 int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req) 1519 { 1520 struct ceph_mds_session *session = req->r_session; 1521 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info; 1522 struct inode *in = NULL; 1523 struct ceph_vino tvino, dvino; 1524 struct ceph_fs_client *fsc = ceph_sb_to_fs_client(sb); 1525 struct ceph_client *cl = fsc->client; 1526 int err = 0; 1527 1528 doutc(cl, "%p is_dentry %d is_target %d\n", req, 1529 rinfo->head->is_dentry, rinfo->head->is_target); 1530 1531 if (!rinfo->head->is_target && !rinfo->head->is_dentry) { 1532 doutc(cl, "reply is empty!\n"); 1533 if (rinfo->head->result == 0 && req->r_parent) 1534 ceph_invalidate_dir_request(req); 1535 return 0; 1536 } 1537 1538 if (rinfo->head->is_dentry) { 1539 struct inode *dir = req->r_parent; 1540 1541 if (dir) { 1542 err = ceph_fill_inode(dir, NULL, &rinfo->diri, 1543 rinfo->dirfrag, session, -1, 1544 &req->r_caps_reservation); 1545 if (err < 0) 1546 goto done; 1547 } else { 1548 WARN_ON_ONCE(1); 1549 } 1550 1551 if (dir && req->r_op == CEPH_MDS_OP_LOOKUPNAME && 1552 test_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags) && 1553 !test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) { 1554 bool is_nokey = false; 1555 struct qstr dname; 1556 struct dentry *dn, *parent; 1557 struct fscrypt_str oname = FSTR_INIT(NULL, 0); 1558 struct ceph_fname fname = { .dir = dir, 1559 .name = rinfo->dname, 1560 .ctext = rinfo->altname, 1561 .name_len = rinfo->dname_len, 1562 .ctext_len = rinfo->altname_len }; 1563 1564 BUG_ON(!rinfo->head->is_target); 1565 BUG_ON(req->r_dentry); 1566 1567 parent = d_find_any_alias(dir); 1568 BUG_ON(!parent); 1569 1570 err = ceph_fname_alloc_buffer(dir, &oname); 1571 if (err < 0) { 1572 dput(parent); 1573 goto done; 1574 } 1575 1576 err = ceph_fname_to_usr(&fname, NULL, &oname, &is_nokey); 1577 if (err < 0) { 1578 dput(parent); 1579 ceph_fname_free_buffer(dir, &oname); 1580 goto done; 1581 } 1582 dname.name = oname.name; 1583 dname.len = oname.len; 1584 dname.hash = full_name_hash(parent, dname.name, dname.len); 1585 tvino.ino = le64_to_cpu(rinfo->targeti.in->ino); 1586 tvino.snap = le64_to_cpu(rinfo->targeti.in->snapid); 1587 retry_lookup: 1588 dn = d_lookup(parent, &dname); 1589 doutc(cl, "d_lookup on parent=%p name=%.*s got %p\n", 1590 parent, dname.len, dname.name, dn); 1591 1592 if (!dn) { 1593 dn = d_alloc(parent, &dname); 1594 doutc(cl, "d_alloc %p '%.*s' = %p\n", parent, 1595 dname.len, dname.name, dn); 1596 if (!dn) { 1597 dput(parent); 1598 ceph_fname_free_buffer(dir, &oname); 1599 err = -ENOMEM; 1600 goto done; 1601 } 1602 if (is_nokey) { 1603 spin_lock(&dn->d_lock); 1604 dn->d_flags |= DCACHE_NOKEY_NAME; 1605 spin_unlock(&dn->d_lock); 1606 } 1607 err = 0; 1608 } else if (d_really_is_positive(dn) && 1609 (ceph_ino(d_inode(dn)) != tvino.ino || 1610 ceph_snap(d_inode(dn)) != tvino.snap)) { 1611 doutc(cl, " dn %p points to wrong inode %p\n", 1612 dn, d_inode(dn)); 1613 ceph_dir_clear_ordered(dir); 1614 d_delete(dn); 1615 dput(dn); 1616 goto retry_lookup; 1617 } 1618 ceph_fname_free_buffer(dir, &oname); 1619 1620 req->r_dentry = dn; 1621 dput(parent); 1622 } 1623 } 1624 1625 if (rinfo->head->is_target) { 1626 /* Should be filled in by handle_reply */ 1627 BUG_ON(!req->r_target_inode); 1628 1629 in = req->r_target_inode; 1630 err = ceph_fill_inode(in, req->r_locked_page, &rinfo->targeti, 1631 NULL, session, 1632 (!test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags) && 1633 !test_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags) && 1634 rinfo->head->result == 0) ? req->r_fmode : -1, 1635 &req->r_caps_reservation); 1636 if (err < 0) { 1637 pr_err_client(cl, "badness %p %llx.%llx\n", in, 1638 ceph_vinop(in)); 1639 req->r_target_inode = NULL; 1640 if (in->i_state & I_NEW) 1641 discard_new_inode(in); 1642 else 1643 iput(in); 1644 goto done; 1645 } 1646 if (in->i_state & I_NEW) 1647 unlock_new_inode(in); 1648 } 1649 1650 /* 1651 * ignore null lease/binding on snapdir ENOENT, or else we 1652 * will have trouble splicing in the virtual snapdir later 1653 */ 1654 if (rinfo->head->is_dentry && 1655 !test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags) && 1656 test_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags) && 1657 (rinfo->head->is_target || strncmp(req->r_dentry->d_name.name, 1658 fsc->mount_options->snapdir_name, 1659 req->r_dentry->d_name.len))) { 1660 /* 1661 * lookup link rename : null -> possibly existing inode 1662 * mknod symlink mkdir : null -> new inode 1663 * unlink : linked -> null 1664 */ 1665 struct inode *dir = req->r_parent; 1666 struct dentry *dn = req->r_dentry; 1667 bool have_dir_cap, have_lease; 1668 1669 BUG_ON(!dn); 1670 BUG_ON(!dir); 1671 BUG_ON(d_inode(dn->d_parent) != dir); 1672 1673 dvino.ino = le64_to_cpu(rinfo->diri.in->ino); 1674 dvino.snap = le64_to_cpu(rinfo->diri.in->snapid); 1675 1676 BUG_ON(ceph_ino(dir) != dvino.ino); 1677 BUG_ON(ceph_snap(dir) != dvino.snap); 1678 1679 /* do we have a lease on the whole dir? */ 1680 have_dir_cap = 1681 (le32_to_cpu(rinfo->diri.in->cap.caps) & 1682 CEPH_CAP_FILE_SHARED); 1683 1684 /* do we have a dn lease? */ 1685 have_lease = have_dir_cap || 1686 le32_to_cpu(rinfo->dlease->duration_ms); 1687 if (!have_lease) 1688 doutc(cl, "no dentry lease or dir cap\n"); 1689 1690 /* rename? */ 1691 if (req->r_old_dentry && req->r_op == CEPH_MDS_OP_RENAME) { 1692 struct inode *olddir = req->r_old_dentry_dir; 1693 BUG_ON(!olddir); 1694 1695 doutc(cl, " src %p '%pd' dst %p '%pd'\n", 1696 req->r_old_dentry, req->r_old_dentry, dn, dn); 1697 doutc(cl, "doing d_move %p -> %p\n", req->r_old_dentry, dn); 1698 1699 /* d_move screws up sibling dentries' offsets */ 1700 ceph_dir_clear_ordered(dir); 1701 ceph_dir_clear_ordered(olddir); 1702 1703 d_move(req->r_old_dentry, dn); 1704 doutc(cl, " src %p '%pd' dst %p '%pd'\n", 1705 req->r_old_dentry, req->r_old_dentry, dn, dn); 1706 1707 /* ensure target dentry is invalidated, despite 1708 rehashing bug in vfs_rename_dir */ 1709 ceph_invalidate_dentry_lease(dn); 1710 1711 doutc(cl, "dn %p gets new offset %lld\n", 1712 req->r_old_dentry, 1713 ceph_dentry(req->r_old_dentry)->offset); 1714 1715 /* swap r_dentry and r_old_dentry in case that 1716 * splice_dentry() gets called later. This is safe 1717 * because no other place will use them */ 1718 req->r_dentry = req->r_old_dentry; 1719 req->r_old_dentry = dn; 1720 dn = req->r_dentry; 1721 } 1722 1723 /* null dentry? */ 1724 if (!rinfo->head->is_target) { 1725 doutc(cl, "null dentry\n"); 1726 if (d_really_is_positive(dn)) { 1727 doutc(cl, "d_delete %p\n", dn); 1728 ceph_dir_clear_ordered(dir); 1729 d_delete(dn); 1730 } else if (have_lease) { 1731 if (d_unhashed(dn)) 1732 d_add(dn, NULL); 1733 } 1734 1735 if (!d_unhashed(dn) && have_lease) 1736 update_dentry_lease(dir, dn, 1737 rinfo->dlease, session, 1738 req->r_request_started); 1739 goto done; 1740 } 1741 1742 /* attach proper inode */ 1743 if (d_really_is_negative(dn)) { 1744 ceph_dir_clear_ordered(dir); 1745 ihold(in); 1746 err = splice_dentry(&req->r_dentry, in); 1747 if (err < 0) 1748 goto done; 1749 dn = req->r_dentry; /* may have spliced */ 1750 } else if (d_really_is_positive(dn) && d_inode(dn) != in) { 1751 doutc(cl, " %p links to %p %llx.%llx, not %llx.%llx\n", 1752 dn, d_inode(dn), ceph_vinop(d_inode(dn)), 1753 ceph_vinop(in)); 1754 d_invalidate(dn); 1755 have_lease = false; 1756 } 1757 1758 if (have_lease) { 1759 update_dentry_lease(dir, dn, 1760 rinfo->dlease, session, 1761 req->r_request_started); 1762 } 1763 doutc(cl, " final dn %p\n", dn); 1764 } else if ((req->r_op == CEPH_MDS_OP_LOOKUPSNAP || 1765 req->r_op == CEPH_MDS_OP_MKSNAP) && 1766 test_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags) && 1767 !test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) { 1768 struct inode *dir = req->r_parent; 1769 1770 /* fill out a snapdir LOOKUPSNAP dentry */ 1771 BUG_ON(!dir); 1772 BUG_ON(ceph_snap(dir) != CEPH_SNAPDIR); 1773 BUG_ON(!req->r_dentry); 1774 doutc(cl, " linking snapped dir %p to dn %p\n", in, 1775 req->r_dentry); 1776 ceph_dir_clear_ordered(dir); 1777 ihold(in); 1778 err = splice_dentry(&req->r_dentry, in); 1779 if (err < 0) 1780 goto done; 1781 } else if (rinfo->head->is_dentry && req->r_dentry) { 1782 /* parent inode is not locked, be careful */ 1783 struct ceph_vino *ptvino = NULL; 1784 dvino.ino = le64_to_cpu(rinfo->diri.in->ino); 1785 dvino.snap = le64_to_cpu(rinfo->diri.in->snapid); 1786 if (rinfo->head->is_target) { 1787 tvino.ino = le64_to_cpu(rinfo->targeti.in->ino); 1788 tvino.snap = le64_to_cpu(rinfo->targeti.in->snapid); 1789 ptvino = &tvino; 1790 } 1791 update_dentry_lease_careful(req->r_dentry, rinfo->dlease, 1792 session, req->r_request_started, 1793 rinfo->dname, rinfo->dname_len, 1794 &dvino, ptvino); 1795 } 1796 done: 1797 doutc(cl, "done err=%d\n", err); 1798 return err; 1799 } 1800 1801 /* 1802 * Prepopulate our cache with readdir results, leases, etc. 1803 */ 1804 static int readdir_prepopulate_inodes_only(struct ceph_mds_request *req, 1805 struct ceph_mds_session *session) 1806 { 1807 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info; 1808 struct ceph_client *cl = session->s_mdsc->fsc->client; 1809 int i, err = 0; 1810 1811 for (i = 0; i < rinfo->dir_nr; i++) { 1812 struct ceph_mds_reply_dir_entry *rde = rinfo->dir_entries + i; 1813 struct ceph_vino vino; 1814 struct inode *in; 1815 int rc; 1816 1817 vino.ino = le64_to_cpu(rde->inode.in->ino); 1818 vino.snap = le64_to_cpu(rde->inode.in->snapid); 1819 1820 in = ceph_get_inode(req->r_dentry->d_sb, vino, NULL); 1821 if (IS_ERR(in)) { 1822 err = PTR_ERR(in); 1823 doutc(cl, "badness got %d\n", err); 1824 continue; 1825 } 1826 rc = ceph_fill_inode(in, NULL, &rde->inode, NULL, session, 1827 -1, &req->r_caps_reservation); 1828 if (rc < 0) { 1829 pr_err_client(cl, "inode badness on %p got %d\n", in, 1830 rc); 1831 err = rc; 1832 if (in->i_state & I_NEW) { 1833 ihold(in); 1834 discard_new_inode(in); 1835 } 1836 } else if (in->i_state & I_NEW) { 1837 unlock_new_inode(in); 1838 } 1839 1840 iput(in); 1841 } 1842 1843 return err; 1844 } 1845 1846 void ceph_readdir_cache_release(struct ceph_readdir_cache_control *ctl) 1847 { 1848 if (ctl->page) { 1849 kunmap(ctl->page); 1850 put_page(ctl->page); 1851 ctl->page = NULL; 1852 } 1853 } 1854 1855 static int fill_readdir_cache(struct inode *dir, struct dentry *dn, 1856 struct ceph_readdir_cache_control *ctl, 1857 struct ceph_mds_request *req) 1858 { 1859 struct ceph_client *cl = ceph_inode_to_client(dir); 1860 struct ceph_inode_info *ci = ceph_inode(dir); 1861 unsigned nsize = PAGE_SIZE / sizeof(struct dentry*); 1862 unsigned idx = ctl->index % nsize; 1863 pgoff_t pgoff = ctl->index / nsize; 1864 1865 if (!ctl->page || pgoff != ctl->page->index) { 1866 ceph_readdir_cache_release(ctl); 1867 if (idx == 0) 1868 ctl->page = grab_cache_page(&dir->i_data, pgoff); 1869 else 1870 ctl->page = find_lock_page(&dir->i_data, pgoff); 1871 if (!ctl->page) { 1872 ctl->index = -1; 1873 return idx == 0 ? -ENOMEM : 0; 1874 } 1875 /* reading/filling the cache are serialized by 1876 * i_rwsem, no need to use page lock */ 1877 unlock_page(ctl->page); 1878 ctl->dentries = kmap(ctl->page); 1879 if (idx == 0) 1880 memset(ctl->dentries, 0, PAGE_SIZE); 1881 } 1882 1883 if (req->r_dir_release_cnt == atomic64_read(&ci->i_release_count) && 1884 req->r_dir_ordered_cnt == atomic64_read(&ci->i_ordered_count)) { 1885 doutc(cl, "dn %p idx %d\n", dn, ctl->index); 1886 ctl->dentries[idx] = dn; 1887 ctl->index++; 1888 } else { 1889 doutc(cl, "disable readdir cache\n"); 1890 ctl->index = -1; 1891 } 1892 return 0; 1893 } 1894 1895 int ceph_readdir_prepopulate(struct ceph_mds_request *req, 1896 struct ceph_mds_session *session) 1897 { 1898 struct dentry *parent = req->r_dentry; 1899 struct inode *inode = d_inode(parent); 1900 struct ceph_inode_info *ci = ceph_inode(inode); 1901 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info; 1902 struct ceph_client *cl = session->s_mdsc->fsc->client; 1903 struct qstr dname; 1904 struct dentry *dn; 1905 struct inode *in; 1906 int err = 0, skipped = 0, ret, i; 1907 u32 frag = le32_to_cpu(req->r_args.readdir.frag); 1908 u32 last_hash = 0; 1909 u32 fpos_offset; 1910 struct ceph_readdir_cache_control cache_ctl = {}; 1911 1912 if (test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) 1913 return readdir_prepopulate_inodes_only(req, session); 1914 1915 if (rinfo->hash_order) { 1916 if (req->r_path2) { 1917 last_hash = ceph_str_hash(ci->i_dir_layout.dl_dir_hash, 1918 req->r_path2, 1919 strlen(req->r_path2)); 1920 last_hash = ceph_frag_value(last_hash); 1921 } else if (rinfo->offset_hash) { 1922 /* mds understands offset_hash */ 1923 WARN_ON_ONCE(req->r_readdir_offset != 2); 1924 last_hash = le32_to_cpu(req->r_args.readdir.offset_hash); 1925 } 1926 } 1927 1928 if (rinfo->dir_dir && 1929 le32_to_cpu(rinfo->dir_dir->frag) != frag) { 1930 doutc(cl, "got new frag %x -> %x\n", frag, 1931 le32_to_cpu(rinfo->dir_dir->frag)); 1932 frag = le32_to_cpu(rinfo->dir_dir->frag); 1933 if (!rinfo->hash_order) 1934 req->r_readdir_offset = 2; 1935 } 1936 1937 if (le32_to_cpu(rinfo->head->op) == CEPH_MDS_OP_LSSNAP) { 1938 doutc(cl, "%d items under SNAPDIR dn %p\n", 1939 rinfo->dir_nr, parent); 1940 } else { 1941 doutc(cl, "%d items under dn %p\n", rinfo->dir_nr, parent); 1942 if (rinfo->dir_dir) 1943 ceph_fill_dirfrag(d_inode(parent), rinfo->dir_dir); 1944 1945 if (ceph_frag_is_leftmost(frag) && 1946 req->r_readdir_offset == 2 && 1947 !(rinfo->hash_order && last_hash)) { 1948 /* note dir version at start of readdir so we can 1949 * tell if any dentries get dropped */ 1950 req->r_dir_release_cnt = 1951 atomic64_read(&ci->i_release_count); 1952 req->r_dir_ordered_cnt = 1953 atomic64_read(&ci->i_ordered_count); 1954 req->r_readdir_cache_idx = 0; 1955 } 1956 } 1957 1958 cache_ctl.index = req->r_readdir_cache_idx; 1959 fpos_offset = req->r_readdir_offset; 1960 1961 /* FIXME: release caps/leases if error occurs */ 1962 for (i = 0; i < rinfo->dir_nr; i++) { 1963 struct ceph_mds_reply_dir_entry *rde = rinfo->dir_entries + i; 1964 struct ceph_vino tvino; 1965 1966 dname.name = rde->name; 1967 dname.len = rde->name_len; 1968 dname.hash = full_name_hash(parent, dname.name, dname.len); 1969 1970 tvino.ino = le64_to_cpu(rde->inode.in->ino); 1971 tvino.snap = le64_to_cpu(rde->inode.in->snapid); 1972 1973 if (rinfo->hash_order) { 1974 u32 hash = ceph_frag_value(rde->raw_hash); 1975 if (hash != last_hash) 1976 fpos_offset = 2; 1977 last_hash = hash; 1978 rde->offset = ceph_make_fpos(hash, fpos_offset++, true); 1979 } else { 1980 rde->offset = ceph_make_fpos(frag, fpos_offset++, false); 1981 } 1982 1983 retry_lookup: 1984 dn = d_lookup(parent, &dname); 1985 doutc(cl, "d_lookup on parent=%p name=%.*s got %p\n", 1986 parent, dname.len, dname.name, dn); 1987 1988 if (!dn) { 1989 dn = d_alloc(parent, &dname); 1990 doutc(cl, "d_alloc %p '%.*s' = %p\n", parent, 1991 dname.len, dname.name, dn); 1992 if (!dn) { 1993 doutc(cl, "d_alloc badness\n"); 1994 err = -ENOMEM; 1995 goto out; 1996 } 1997 if (rde->is_nokey) { 1998 spin_lock(&dn->d_lock); 1999 dn->d_flags |= DCACHE_NOKEY_NAME; 2000 spin_unlock(&dn->d_lock); 2001 } 2002 } else if (d_really_is_positive(dn) && 2003 (ceph_ino(d_inode(dn)) != tvino.ino || 2004 ceph_snap(d_inode(dn)) != tvino.snap)) { 2005 struct ceph_dentry_info *di = ceph_dentry(dn); 2006 doutc(cl, " dn %p points to wrong inode %p\n", 2007 dn, d_inode(dn)); 2008 2009 spin_lock(&dn->d_lock); 2010 if (di->offset > 0 && 2011 di->lease_shared_gen == 2012 atomic_read(&ci->i_shared_gen)) { 2013 __ceph_dir_clear_ordered(ci); 2014 di->offset = 0; 2015 } 2016 spin_unlock(&dn->d_lock); 2017 2018 d_delete(dn); 2019 dput(dn); 2020 goto retry_lookup; 2021 } 2022 2023 /* inode */ 2024 if (d_really_is_positive(dn)) { 2025 in = d_inode(dn); 2026 } else { 2027 in = ceph_get_inode(parent->d_sb, tvino, NULL); 2028 if (IS_ERR(in)) { 2029 doutc(cl, "new_inode badness\n"); 2030 d_drop(dn); 2031 dput(dn); 2032 err = PTR_ERR(in); 2033 goto out; 2034 } 2035 } 2036 2037 ret = ceph_fill_inode(in, NULL, &rde->inode, NULL, session, 2038 -1, &req->r_caps_reservation); 2039 if (ret < 0) { 2040 pr_err_client(cl, "badness on %p %llx.%llx\n", in, 2041 ceph_vinop(in)); 2042 if (d_really_is_negative(dn)) { 2043 if (in->i_state & I_NEW) { 2044 ihold(in); 2045 discard_new_inode(in); 2046 } 2047 iput(in); 2048 } 2049 d_drop(dn); 2050 err = ret; 2051 goto next_item; 2052 } 2053 if (in->i_state & I_NEW) 2054 unlock_new_inode(in); 2055 2056 if (d_really_is_negative(dn)) { 2057 if (ceph_security_xattr_deadlock(in)) { 2058 doutc(cl, " skip splicing dn %p to inode %p" 2059 " (security xattr deadlock)\n", dn, in); 2060 iput(in); 2061 skipped++; 2062 goto next_item; 2063 } 2064 2065 err = splice_dentry(&dn, in); 2066 if (err < 0) 2067 goto next_item; 2068 } 2069 2070 ceph_dentry(dn)->offset = rde->offset; 2071 2072 update_dentry_lease(d_inode(parent), dn, 2073 rde->lease, req->r_session, 2074 req->r_request_started); 2075 2076 if (err == 0 && skipped == 0 && cache_ctl.index >= 0) { 2077 ret = fill_readdir_cache(d_inode(parent), dn, 2078 &cache_ctl, req); 2079 if (ret < 0) 2080 err = ret; 2081 } 2082 next_item: 2083 dput(dn); 2084 } 2085 out: 2086 if (err == 0 && skipped == 0) { 2087 set_bit(CEPH_MDS_R_DID_PREPOPULATE, &req->r_req_flags); 2088 req->r_readdir_cache_idx = cache_ctl.index; 2089 } 2090 ceph_readdir_cache_release(&cache_ctl); 2091 doutc(cl, "done\n"); 2092 return err; 2093 } 2094 2095 bool ceph_inode_set_size(struct inode *inode, loff_t size) 2096 { 2097 struct ceph_client *cl = ceph_inode_to_client(inode); 2098 struct ceph_inode_info *ci = ceph_inode(inode); 2099 bool ret; 2100 2101 spin_lock(&ci->i_ceph_lock); 2102 doutc(cl, "set_size %p %llu -> %llu\n", inode, i_size_read(inode), size); 2103 i_size_write(inode, size); 2104 ceph_fscache_update(inode); 2105 inode->i_blocks = calc_inode_blocks(size); 2106 2107 ret = __ceph_should_report_size(ci); 2108 2109 spin_unlock(&ci->i_ceph_lock); 2110 2111 return ret; 2112 } 2113 2114 void ceph_queue_inode_work(struct inode *inode, int work_bit) 2115 { 2116 struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode); 2117 struct ceph_client *cl = fsc->client; 2118 struct ceph_inode_info *ci = ceph_inode(inode); 2119 set_bit(work_bit, &ci->i_work_mask); 2120 2121 ihold(inode); 2122 if (queue_work(fsc->inode_wq, &ci->i_work)) { 2123 doutc(cl, "%p %llx.%llx mask=%lx\n", inode, 2124 ceph_vinop(inode), ci->i_work_mask); 2125 } else { 2126 doutc(cl, "%p %llx.%llx already queued, mask=%lx\n", 2127 inode, ceph_vinop(inode), ci->i_work_mask); 2128 iput(inode); 2129 } 2130 } 2131 2132 static void ceph_do_invalidate_pages(struct inode *inode) 2133 { 2134 struct ceph_client *cl = ceph_inode_to_client(inode); 2135 struct ceph_inode_info *ci = ceph_inode(inode); 2136 u32 orig_gen; 2137 int check = 0; 2138 2139 ceph_fscache_invalidate(inode, false); 2140 2141 mutex_lock(&ci->i_truncate_mutex); 2142 2143 if (ceph_inode_is_shutdown(inode)) { 2144 pr_warn_ratelimited_client(cl, 2145 "%p %llx.%llx is shut down\n", inode, 2146 ceph_vinop(inode)); 2147 mapping_set_error(inode->i_mapping, -EIO); 2148 truncate_pagecache(inode, 0); 2149 mutex_unlock(&ci->i_truncate_mutex); 2150 goto out; 2151 } 2152 2153 spin_lock(&ci->i_ceph_lock); 2154 doutc(cl, "%p %llx.%llx gen %d revoking %d\n", inode, 2155 ceph_vinop(inode), ci->i_rdcache_gen, ci->i_rdcache_revoking); 2156 if (ci->i_rdcache_revoking != ci->i_rdcache_gen) { 2157 if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE)) 2158 check = 1; 2159 spin_unlock(&ci->i_ceph_lock); 2160 mutex_unlock(&ci->i_truncate_mutex); 2161 goto out; 2162 } 2163 orig_gen = ci->i_rdcache_gen; 2164 spin_unlock(&ci->i_ceph_lock); 2165 2166 if (invalidate_inode_pages2(inode->i_mapping) < 0) { 2167 pr_err_client(cl, "invalidate_inode_pages2 %llx.%llx failed\n", 2168 ceph_vinop(inode)); 2169 } 2170 2171 spin_lock(&ci->i_ceph_lock); 2172 if (orig_gen == ci->i_rdcache_gen && 2173 orig_gen == ci->i_rdcache_revoking) { 2174 doutc(cl, "%p %llx.%llx gen %d successful\n", inode, 2175 ceph_vinop(inode), ci->i_rdcache_gen); 2176 ci->i_rdcache_revoking--; 2177 check = 1; 2178 } else { 2179 doutc(cl, "%p %llx.%llx gen %d raced, now %d revoking %d\n", 2180 inode, ceph_vinop(inode), orig_gen, ci->i_rdcache_gen, 2181 ci->i_rdcache_revoking); 2182 if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE)) 2183 check = 1; 2184 } 2185 spin_unlock(&ci->i_ceph_lock); 2186 mutex_unlock(&ci->i_truncate_mutex); 2187 out: 2188 if (check) 2189 ceph_check_caps(ci, 0); 2190 } 2191 2192 /* 2193 * Make sure any pending truncation is applied before doing anything 2194 * that may depend on it. 2195 */ 2196 void __ceph_do_pending_vmtruncate(struct inode *inode) 2197 { 2198 struct ceph_client *cl = ceph_inode_to_client(inode); 2199 struct ceph_inode_info *ci = ceph_inode(inode); 2200 u64 to; 2201 int wrbuffer_refs, finish = 0; 2202 2203 mutex_lock(&ci->i_truncate_mutex); 2204 retry: 2205 spin_lock(&ci->i_ceph_lock); 2206 if (ci->i_truncate_pending == 0) { 2207 doutc(cl, "%p %llx.%llx none pending\n", inode, 2208 ceph_vinop(inode)); 2209 spin_unlock(&ci->i_ceph_lock); 2210 mutex_unlock(&ci->i_truncate_mutex); 2211 return; 2212 } 2213 2214 /* 2215 * make sure any dirty snapped pages are flushed before we 2216 * possibly truncate them.. so write AND block! 2217 */ 2218 if (ci->i_wrbuffer_ref_head < ci->i_wrbuffer_ref) { 2219 spin_unlock(&ci->i_ceph_lock); 2220 doutc(cl, "%p %llx.%llx flushing snaps first\n", inode, 2221 ceph_vinop(inode)); 2222 filemap_write_and_wait_range(&inode->i_data, 0, 2223 inode->i_sb->s_maxbytes); 2224 goto retry; 2225 } 2226 2227 /* there should be no reader or writer */ 2228 WARN_ON_ONCE(ci->i_rd_ref || ci->i_wr_ref); 2229 2230 to = ci->i_truncate_pagecache_size; 2231 wrbuffer_refs = ci->i_wrbuffer_ref; 2232 doutc(cl, "%p %llx.%llx (%d) to %lld\n", inode, ceph_vinop(inode), 2233 ci->i_truncate_pending, to); 2234 spin_unlock(&ci->i_ceph_lock); 2235 2236 ceph_fscache_resize(inode, to); 2237 truncate_pagecache(inode, to); 2238 2239 spin_lock(&ci->i_ceph_lock); 2240 if (to == ci->i_truncate_pagecache_size) { 2241 ci->i_truncate_pending = 0; 2242 finish = 1; 2243 } 2244 spin_unlock(&ci->i_ceph_lock); 2245 if (!finish) 2246 goto retry; 2247 2248 mutex_unlock(&ci->i_truncate_mutex); 2249 2250 if (wrbuffer_refs == 0) 2251 ceph_check_caps(ci, 0); 2252 2253 wake_up_all(&ci->i_cap_wq); 2254 } 2255 2256 static void ceph_inode_work(struct work_struct *work) 2257 { 2258 struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info, 2259 i_work); 2260 struct inode *inode = &ci->netfs.inode; 2261 struct ceph_client *cl = ceph_inode_to_client(inode); 2262 2263 if (test_and_clear_bit(CEPH_I_WORK_WRITEBACK, &ci->i_work_mask)) { 2264 doutc(cl, "writeback %p %llx.%llx\n", inode, ceph_vinop(inode)); 2265 filemap_fdatawrite(&inode->i_data); 2266 } 2267 if (test_and_clear_bit(CEPH_I_WORK_INVALIDATE_PAGES, &ci->i_work_mask)) 2268 ceph_do_invalidate_pages(inode); 2269 2270 if (test_and_clear_bit(CEPH_I_WORK_VMTRUNCATE, &ci->i_work_mask)) 2271 __ceph_do_pending_vmtruncate(inode); 2272 2273 if (test_and_clear_bit(CEPH_I_WORK_CHECK_CAPS, &ci->i_work_mask)) 2274 ceph_check_caps(ci, 0); 2275 2276 if (test_and_clear_bit(CEPH_I_WORK_FLUSH_SNAPS, &ci->i_work_mask)) 2277 ceph_flush_snaps(ci, NULL); 2278 2279 iput(inode); 2280 } 2281 2282 static const char *ceph_encrypted_get_link(struct dentry *dentry, 2283 struct inode *inode, 2284 struct delayed_call *done) 2285 { 2286 struct ceph_inode_info *ci = ceph_inode(inode); 2287 2288 if (!dentry) 2289 return ERR_PTR(-ECHILD); 2290 2291 return fscrypt_get_symlink(inode, ci->i_symlink, i_size_read(inode), 2292 done); 2293 } 2294 2295 static int ceph_encrypted_symlink_getattr(struct mnt_idmap *idmap, 2296 const struct path *path, 2297 struct kstat *stat, u32 request_mask, 2298 unsigned int query_flags) 2299 { 2300 int ret; 2301 2302 ret = ceph_getattr(idmap, path, stat, request_mask, query_flags); 2303 if (ret) 2304 return ret; 2305 return fscrypt_symlink_getattr(path, stat); 2306 } 2307 2308 /* 2309 * symlinks 2310 */ 2311 static const struct inode_operations ceph_symlink_iops = { 2312 .get_link = simple_get_link, 2313 .setattr = ceph_setattr, 2314 .getattr = ceph_getattr, 2315 .listxattr = ceph_listxattr, 2316 }; 2317 2318 static const struct inode_operations ceph_encrypted_symlink_iops = { 2319 .get_link = ceph_encrypted_get_link, 2320 .setattr = ceph_setattr, 2321 .getattr = ceph_encrypted_symlink_getattr, 2322 .listxattr = ceph_listxattr, 2323 }; 2324 2325 /* 2326 * Transfer the encrypted last block to the MDS and the MDS 2327 * will help update it when truncating a smaller size. 2328 * 2329 * We don't support a PAGE_SIZE that is smaller than the 2330 * CEPH_FSCRYPT_BLOCK_SIZE. 2331 */ 2332 static int fill_fscrypt_truncate(struct inode *inode, 2333 struct ceph_mds_request *req, 2334 struct iattr *attr) 2335 { 2336 struct ceph_client *cl = ceph_inode_to_client(inode); 2337 struct ceph_inode_info *ci = ceph_inode(inode); 2338 int boff = attr->ia_size % CEPH_FSCRYPT_BLOCK_SIZE; 2339 loff_t pos, orig_pos = round_down(attr->ia_size, 2340 CEPH_FSCRYPT_BLOCK_SIZE); 2341 u64 block = orig_pos >> CEPH_FSCRYPT_BLOCK_SHIFT; 2342 struct ceph_pagelist *pagelist = NULL; 2343 struct kvec iov = {0}; 2344 struct iov_iter iter; 2345 struct page *page = NULL; 2346 struct ceph_fscrypt_truncate_size_header header; 2347 int retry_op = 0; 2348 int len = CEPH_FSCRYPT_BLOCK_SIZE; 2349 loff_t i_size = i_size_read(inode); 2350 int got, ret, issued; 2351 u64 objver; 2352 2353 ret = __ceph_get_caps(inode, NULL, CEPH_CAP_FILE_RD, 0, -1, &got); 2354 if (ret < 0) 2355 return ret; 2356 2357 issued = __ceph_caps_issued(ci, NULL); 2358 2359 doutc(cl, "size %lld -> %lld got cap refs on %s, issued %s\n", 2360 i_size, attr->ia_size, ceph_cap_string(got), 2361 ceph_cap_string(issued)); 2362 2363 /* Try to writeback the dirty pagecaches */ 2364 if (issued & (CEPH_CAP_FILE_BUFFER)) { 2365 loff_t lend = orig_pos + CEPH_FSCRYPT_BLOCK_SHIFT - 1; 2366 2367 ret = filemap_write_and_wait_range(inode->i_mapping, 2368 orig_pos, lend); 2369 if (ret < 0) 2370 goto out; 2371 } 2372 2373 page = __page_cache_alloc(GFP_KERNEL); 2374 if (page == NULL) { 2375 ret = -ENOMEM; 2376 goto out; 2377 } 2378 2379 pagelist = ceph_pagelist_alloc(GFP_KERNEL); 2380 if (!pagelist) { 2381 ret = -ENOMEM; 2382 goto out; 2383 } 2384 2385 iov.iov_base = kmap_local_page(page); 2386 iov.iov_len = len; 2387 iov_iter_kvec(&iter, READ, &iov, 1, len); 2388 2389 pos = orig_pos; 2390 ret = __ceph_sync_read(inode, &pos, &iter, &retry_op, &objver); 2391 if (ret < 0) 2392 goto out; 2393 2394 /* Insert the header first */ 2395 header.ver = 1; 2396 header.compat = 1; 2397 header.change_attr = cpu_to_le64(inode_peek_iversion_raw(inode)); 2398 2399 /* 2400 * Always set the block_size to CEPH_FSCRYPT_BLOCK_SIZE, 2401 * because in MDS it may need this to do the truncate. 2402 */ 2403 header.block_size = cpu_to_le32(CEPH_FSCRYPT_BLOCK_SIZE); 2404 2405 /* 2406 * If we hit a hole here, we should just skip filling 2407 * the fscrypt for the request, because once the fscrypt 2408 * is enabled, the file will be split into many blocks 2409 * with the size of CEPH_FSCRYPT_BLOCK_SIZE, if there 2410 * has a hole, the hole size should be multiple of block 2411 * size. 2412 * 2413 * If the Rados object doesn't exist, it will be set to 0. 2414 */ 2415 if (!objver) { 2416 doutc(cl, "hit hole, ppos %lld < size %lld\n", pos, i_size); 2417 2418 header.data_len = cpu_to_le32(8 + 8 + 4); 2419 header.file_offset = 0; 2420 ret = 0; 2421 } else { 2422 header.data_len = cpu_to_le32(8 + 8 + 4 + CEPH_FSCRYPT_BLOCK_SIZE); 2423 header.file_offset = cpu_to_le64(orig_pos); 2424 2425 doutc(cl, "encrypt block boff/bsize %d/%lu\n", boff, 2426 CEPH_FSCRYPT_BLOCK_SIZE); 2427 2428 /* truncate and zero out the extra contents for the last block */ 2429 memset(iov.iov_base + boff, 0, PAGE_SIZE - boff); 2430 2431 /* encrypt the last block */ 2432 ret = ceph_fscrypt_encrypt_block_inplace(inode, page, 2433 CEPH_FSCRYPT_BLOCK_SIZE, 2434 0, block, 2435 GFP_KERNEL); 2436 if (ret) 2437 goto out; 2438 } 2439 2440 /* Insert the header */ 2441 ret = ceph_pagelist_append(pagelist, &header, sizeof(header)); 2442 if (ret) 2443 goto out; 2444 2445 if (header.block_size) { 2446 /* Append the last block contents to pagelist */ 2447 ret = ceph_pagelist_append(pagelist, iov.iov_base, 2448 CEPH_FSCRYPT_BLOCK_SIZE); 2449 if (ret) 2450 goto out; 2451 } 2452 req->r_pagelist = pagelist; 2453 out: 2454 doutc(cl, "%p %llx.%llx size dropping cap refs on %s\n", inode, 2455 ceph_vinop(inode), ceph_cap_string(got)); 2456 ceph_put_cap_refs(ci, got); 2457 if (iov.iov_base) 2458 kunmap_local(iov.iov_base); 2459 if (page) 2460 __free_pages(page, 0); 2461 if (ret && pagelist) 2462 ceph_pagelist_release(pagelist); 2463 return ret; 2464 } 2465 2466 int __ceph_setattr(struct mnt_idmap *idmap, struct inode *inode, 2467 struct iattr *attr, struct ceph_iattr *cia) 2468 { 2469 struct ceph_inode_info *ci = ceph_inode(inode); 2470 unsigned int ia_valid = attr->ia_valid; 2471 struct ceph_mds_request *req; 2472 struct ceph_mds_client *mdsc = ceph_sb_to_fs_client(inode->i_sb)->mdsc; 2473 struct ceph_client *cl = ceph_inode_to_client(inode); 2474 struct ceph_cap_flush *prealloc_cf; 2475 loff_t isize = i_size_read(inode); 2476 int issued; 2477 int release = 0, dirtied = 0; 2478 int mask = 0; 2479 int err = 0; 2480 int inode_dirty_flags = 0; 2481 bool lock_snap_rwsem = false; 2482 bool fill_fscrypt; 2483 int truncate_retry = 20; /* The RMW will take around 50ms */ 2484 struct dentry *dentry; 2485 char *path; 2486 int pathlen; 2487 u64 pathbase; 2488 bool do_sync = false; 2489 2490 dentry = d_find_alias(inode); 2491 if (!dentry) { 2492 do_sync = true; 2493 } else { 2494 path = ceph_mdsc_build_path(mdsc, dentry, &pathlen, &pathbase, 0); 2495 if (IS_ERR(path)) { 2496 do_sync = true; 2497 err = 0; 2498 } else { 2499 err = ceph_mds_check_access(mdsc, path, MAY_WRITE); 2500 } 2501 ceph_mdsc_free_path(path, pathlen); 2502 dput(dentry); 2503 2504 /* For none EACCES cases will let the MDS do the mds auth check */ 2505 if (err == -EACCES) { 2506 return err; 2507 } else if (err < 0) { 2508 do_sync = true; 2509 err = 0; 2510 } 2511 } 2512 2513 retry: 2514 prealloc_cf = ceph_alloc_cap_flush(); 2515 if (!prealloc_cf) 2516 return -ENOMEM; 2517 2518 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETATTR, 2519 USE_AUTH_MDS); 2520 if (IS_ERR(req)) { 2521 ceph_free_cap_flush(prealloc_cf); 2522 return PTR_ERR(req); 2523 } 2524 2525 fill_fscrypt = false; 2526 spin_lock(&ci->i_ceph_lock); 2527 issued = __ceph_caps_issued(ci, NULL); 2528 2529 if (!ci->i_head_snapc && 2530 (issued & (CEPH_CAP_ANY_EXCL | CEPH_CAP_FILE_WR))) { 2531 lock_snap_rwsem = true; 2532 if (!down_read_trylock(&mdsc->snap_rwsem)) { 2533 spin_unlock(&ci->i_ceph_lock); 2534 down_read(&mdsc->snap_rwsem); 2535 spin_lock(&ci->i_ceph_lock); 2536 issued = __ceph_caps_issued(ci, NULL); 2537 } 2538 } 2539 2540 doutc(cl, "%p %llx.%llx issued %s\n", inode, ceph_vinop(inode), 2541 ceph_cap_string(issued)); 2542 #if IS_ENABLED(CONFIG_FS_ENCRYPTION) 2543 if (cia && cia->fscrypt_auth) { 2544 u32 len = ceph_fscrypt_auth_len(cia->fscrypt_auth); 2545 2546 if (len > sizeof(*cia->fscrypt_auth)) { 2547 err = -EINVAL; 2548 spin_unlock(&ci->i_ceph_lock); 2549 goto out; 2550 } 2551 2552 doutc(cl, "%p %llx.%llx fscrypt_auth len %u to %u)\n", inode, 2553 ceph_vinop(inode), ci->fscrypt_auth_len, len); 2554 2555 /* It should never be re-set once set */ 2556 WARN_ON_ONCE(ci->fscrypt_auth); 2557 2558 if (!do_sync && (issued & CEPH_CAP_AUTH_EXCL)) { 2559 dirtied |= CEPH_CAP_AUTH_EXCL; 2560 kfree(ci->fscrypt_auth); 2561 ci->fscrypt_auth = (u8 *)cia->fscrypt_auth; 2562 ci->fscrypt_auth_len = len; 2563 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 || 2564 ci->fscrypt_auth_len != len || 2565 memcmp(ci->fscrypt_auth, cia->fscrypt_auth, len)) { 2566 req->r_fscrypt_auth = cia->fscrypt_auth; 2567 mask |= CEPH_SETATTR_FSCRYPT_AUTH; 2568 release |= CEPH_CAP_AUTH_SHARED; 2569 } 2570 cia->fscrypt_auth = NULL; 2571 } 2572 #else 2573 if (cia && cia->fscrypt_auth) { 2574 err = -EINVAL; 2575 spin_unlock(&ci->i_ceph_lock); 2576 goto out; 2577 } 2578 #endif /* CONFIG_FS_ENCRYPTION */ 2579 2580 if (ia_valid & ATTR_UID) { 2581 kuid_t fsuid = from_vfsuid(idmap, i_user_ns(inode), attr->ia_vfsuid); 2582 2583 doutc(cl, "%p %llx.%llx uid %d -> %d\n", inode, 2584 ceph_vinop(inode), 2585 from_kuid(&init_user_ns, inode->i_uid), 2586 from_kuid(&init_user_ns, attr->ia_uid)); 2587 if (!do_sync && (issued & CEPH_CAP_AUTH_EXCL)) { 2588 inode->i_uid = fsuid; 2589 dirtied |= CEPH_CAP_AUTH_EXCL; 2590 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 || 2591 !uid_eq(fsuid, inode->i_uid)) { 2592 req->r_args.setattr.uid = cpu_to_le32( 2593 from_kuid(&init_user_ns, fsuid)); 2594 mask |= CEPH_SETATTR_UID; 2595 release |= CEPH_CAP_AUTH_SHARED; 2596 } 2597 } 2598 if (ia_valid & ATTR_GID) { 2599 kgid_t fsgid = from_vfsgid(idmap, i_user_ns(inode), attr->ia_vfsgid); 2600 2601 doutc(cl, "%p %llx.%llx gid %d -> %d\n", inode, 2602 ceph_vinop(inode), 2603 from_kgid(&init_user_ns, inode->i_gid), 2604 from_kgid(&init_user_ns, attr->ia_gid)); 2605 if (!do_sync && (issued & CEPH_CAP_AUTH_EXCL)) { 2606 inode->i_gid = fsgid; 2607 dirtied |= CEPH_CAP_AUTH_EXCL; 2608 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 || 2609 !gid_eq(fsgid, inode->i_gid)) { 2610 req->r_args.setattr.gid = cpu_to_le32( 2611 from_kgid(&init_user_ns, fsgid)); 2612 mask |= CEPH_SETATTR_GID; 2613 release |= CEPH_CAP_AUTH_SHARED; 2614 } 2615 } 2616 if (ia_valid & ATTR_MODE) { 2617 doutc(cl, "%p %llx.%llx mode 0%o -> 0%o\n", inode, 2618 ceph_vinop(inode), inode->i_mode, attr->ia_mode); 2619 if (!do_sync && (issued & CEPH_CAP_AUTH_EXCL)) { 2620 inode->i_mode = attr->ia_mode; 2621 dirtied |= CEPH_CAP_AUTH_EXCL; 2622 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 || 2623 attr->ia_mode != inode->i_mode) { 2624 inode->i_mode = attr->ia_mode; 2625 req->r_args.setattr.mode = cpu_to_le32(attr->ia_mode); 2626 mask |= CEPH_SETATTR_MODE; 2627 release |= CEPH_CAP_AUTH_SHARED; 2628 } 2629 } 2630 2631 if (ia_valid & ATTR_ATIME) { 2632 struct timespec64 atime = inode_get_atime(inode); 2633 2634 doutc(cl, "%p %llx.%llx atime %lld.%09ld -> %lld.%09ld\n", 2635 inode, ceph_vinop(inode), 2636 atime.tv_sec, atime.tv_nsec, 2637 attr->ia_atime.tv_sec, attr->ia_atime.tv_nsec); 2638 if (!do_sync && (issued & CEPH_CAP_FILE_EXCL)) { 2639 ci->i_time_warp_seq++; 2640 inode_set_atime_to_ts(inode, attr->ia_atime); 2641 dirtied |= CEPH_CAP_FILE_EXCL; 2642 } else if (!do_sync && (issued & CEPH_CAP_FILE_WR) && 2643 timespec64_compare(&atime, 2644 &attr->ia_atime) < 0) { 2645 inode_set_atime_to_ts(inode, attr->ia_atime); 2646 dirtied |= CEPH_CAP_FILE_WR; 2647 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 || 2648 !timespec64_equal(&atime, &attr->ia_atime)) { 2649 ceph_encode_timespec64(&req->r_args.setattr.atime, 2650 &attr->ia_atime); 2651 mask |= CEPH_SETATTR_ATIME; 2652 release |= CEPH_CAP_FILE_SHARED | 2653 CEPH_CAP_FILE_RD | CEPH_CAP_FILE_WR; 2654 } 2655 } 2656 if (ia_valid & ATTR_SIZE) { 2657 doutc(cl, "%p %llx.%llx size %lld -> %lld\n", inode, 2658 ceph_vinop(inode), isize, attr->ia_size); 2659 /* 2660 * Only when the new size is smaller and not aligned to 2661 * CEPH_FSCRYPT_BLOCK_SIZE will the RMW is needed. 2662 */ 2663 if (IS_ENCRYPTED(inode) && attr->ia_size < isize && 2664 (attr->ia_size % CEPH_FSCRYPT_BLOCK_SIZE)) { 2665 mask |= CEPH_SETATTR_SIZE; 2666 release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_EXCL | 2667 CEPH_CAP_FILE_RD | CEPH_CAP_FILE_WR; 2668 set_bit(CEPH_MDS_R_FSCRYPT_FILE, &req->r_req_flags); 2669 mask |= CEPH_SETATTR_FSCRYPT_FILE; 2670 req->r_args.setattr.size = 2671 cpu_to_le64(round_up(attr->ia_size, 2672 CEPH_FSCRYPT_BLOCK_SIZE)); 2673 req->r_args.setattr.old_size = 2674 cpu_to_le64(round_up(isize, 2675 CEPH_FSCRYPT_BLOCK_SIZE)); 2676 req->r_fscrypt_file = attr->ia_size; 2677 fill_fscrypt = true; 2678 } else if (!do_sync && (issued & CEPH_CAP_FILE_EXCL) && attr->ia_size >= isize) { 2679 if (attr->ia_size > isize) { 2680 i_size_write(inode, attr->ia_size); 2681 inode->i_blocks = calc_inode_blocks(attr->ia_size); 2682 ci->i_reported_size = attr->ia_size; 2683 dirtied |= CEPH_CAP_FILE_EXCL; 2684 ia_valid |= ATTR_MTIME; 2685 } 2686 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 || 2687 attr->ia_size != isize) { 2688 mask |= CEPH_SETATTR_SIZE; 2689 release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_EXCL | 2690 CEPH_CAP_FILE_RD | CEPH_CAP_FILE_WR; 2691 if (IS_ENCRYPTED(inode) && attr->ia_size) { 2692 set_bit(CEPH_MDS_R_FSCRYPT_FILE, &req->r_req_flags); 2693 mask |= CEPH_SETATTR_FSCRYPT_FILE; 2694 req->r_args.setattr.size = 2695 cpu_to_le64(round_up(attr->ia_size, 2696 CEPH_FSCRYPT_BLOCK_SIZE)); 2697 req->r_args.setattr.old_size = 2698 cpu_to_le64(round_up(isize, 2699 CEPH_FSCRYPT_BLOCK_SIZE)); 2700 req->r_fscrypt_file = attr->ia_size; 2701 } else { 2702 req->r_args.setattr.size = cpu_to_le64(attr->ia_size); 2703 req->r_args.setattr.old_size = cpu_to_le64(isize); 2704 req->r_fscrypt_file = 0; 2705 } 2706 } 2707 } 2708 if (ia_valid & ATTR_MTIME) { 2709 struct timespec64 mtime = inode_get_mtime(inode); 2710 2711 doutc(cl, "%p %llx.%llx mtime %lld.%09ld -> %lld.%09ld\n", 2712 inode, ceph_vinop(inode), 2713 mtime.tv_sec, mtime.tv_nsec, 2714 attr->ia_mtime.tv_sec, attr->ia_mtime.tv_nsec); 2715 if (!do_sync && (issued & CEPH_CAP_FILE_EXCL)) { 2716 ci->i_time_warp_seq++; 2717 inode_set_mtime_to_ts(inode, attr->ia_mtime); 2718 dirtied |= CEPH_CAP_FILE_EXCL; 2719 } else if (!do_sync && (issued & CEPH_CAP_FILE_WR) && 2720 timespec64_compare(&mtime, &attr->ia_mtime) < 0) { 2721 inode_set_mtime_to_ts(inode, attr->ia_mtime); 2722 dirtied |= CEPH_CAP_FILE_WR; 2723 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 || 2724 !timespec64_equal(&mtime, &attr->ia_mtime)) { 2725 ceph_encode_timespec64(&req->r_args.setattr.mtime, 2726 &attr->ia_mtime); 2727 mask |= CEPH_SETATTR_MTIME; 2728 release |= CEPH_CAP_FILE_SHARED | 2729 CEPH_CAP_FILE_RD | CEPH_CAP_FILE_WR; 2730 } 2731 } 2732 2733 /* these do nothing */ 2734 if (ia_valid & ATTR_CTIME) { 2735 bool only = (ia_valid & (ATTR_SIZE|ATTR_MTIME|ATTR_ATIME| 2736 ATTR_MODE|ATTR_UID|ATTR_GID)) == 0; 2737 doutc(cl, "%p %llx.%llx ctime %lld.%09ld -> %lld.%09ld (%s)\n", 2738 inode, ceph_vinop(inode), 2739 inode_get_ctime_sec(inode), 2740 inode_get_ctime_nsec(inode), 2741 attr->ia_ctime.tv_sec, attr->ia_ctime.tv_nsec, 2742 only ? "ctime only" : "ignored"); 2743 if (only) { 2744 /* 2745 * if kernel wants to dirty ctime but nothing else, 2746 * we need to choose a cap to dirty under, or do 2747 * a almost-no-op setattr 2748 */ 2749 if (issued & CEPH_CAP_AUTH_EXCL) 2750 dirtied |= CEPH_CAP_AUTH_EXCL; 2751 else if (issued & CEPH_CAP_FILE_EXCL) 2752 dirtied |= CEPH_CAP_FILE_EXCL; 2753 else if (issued & CEPH_CAP_XATTR_EXCL) 2754 dirtied |= CEPH_CAP_XATTR_EXCL; 2755 else 2756 mask |= CEPH_SETATTR_CTIME; 2757 } 2758 } 2759 if (ia_valid & ATTR_FILE) 2760 doutc(cl, "%p %llx.%llx ATTR_FILE ... hrm!\n", inode, 2761 ceph_vinop(inode)); 2762 2763 if (dirtied) { 2764 inode_dirty_flags = __ceph_mark_dirty_caps(ci, dirtied, 2765 &prealloc_cf); 2766 inode_set_ctime_to_ts(inode, attr->ia_ctime); 2767 inode_inc_iversion_raw(inode); 2768 } 2769 2770 release &= issued; 2771 spin_unlock(&ci->i_ceph_lock); 2772 if (lock_snap_rwsem) { 2773 up_read(&mdsc->snap_rwsem); 2774 lock_snap_rwsem = false; 2775 } 2776 2777 if (inode_dirty_flags) 2778 __mark_inode_dirty(inode, inode_dirty_flags); 2779 2780 if (mask) { 2781 req->r_inode = inode; 2782 ihold(inode); 2783 req->r_inode_drop = release; 2784 req->r_args.setattr.mask = cpu_to_le32(mask); 2785 req->r_num_caps = 1; 2786 req->r_stamp = attr->ia_ctime; 2787 if (fill_fscrypt) { 2788 err = fill_fscrypt_truncate(inode, req, attr); 2789 if (err) 2790 goto out; 2791 } 2792 2793 /* 2794 * The truncate request will return -EAGAIN when the 2795 * last block has been updated just before the MDS 2796 * successfully gets the xlock for the FILE lock. To 2797 * avoid corrupting the file contents we need to retry 2798 * it. 2799 */ 2800 err = ceph_mdsc_do_request(mdsc, NULL, req); 2801 if (err == -EAGAIN && truncate_retry--) { 2802 doutc(cl, "%p %llx.%llx result=%d (%s locally, %d remote), retry it!\n", 2803 inode, ceph_vinop(inode), err, 2804 ceph_cap_string(dirtied), mask); 2805 ceph_mdsc_put_request(req); 2806 ceph_free_cap_flush(prealloc_cf); 2807 goto retry; 2808 } 2809 } 2810 out: 2811 doutc(cl, "%p %llx.%llx result=%d (%s locally, %d remote)\n", inode, 2812 ceph_vinop(inode), err, ceph_cap_string(dirtied), mask); 2813 2814 ceph_mdsc_put_request(req); 2815 ceph_free_cap_flush(prealloc_cf); 2816 2817 if (err >= 0 && (mask & CEPH_SETATTR_SIZE)) 2818 __ceph_do_pending_vmtruncate(inode); 2819 2820 return err; 2821 } 2822 2823 /* 2824 * setattr 2825 */ 2826 int ceph_setattr(struct mnt_idmap *idmap, struct dentry *dentry, 2827 struct iattr *attr) 2828 { 2829 struct inode *inode = d_inode(dentry); 2830 struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode); 2831 int err; 2832 2833 if (ceph_snap(inode) != CEPH_NOSNAP) 2834 return -EROFS; 2835 2836 if (ceph_inode_is_shutdown(inode)) 2837 return -ESTALE; 2838 2839 err = fscrypt_prepare_setattr(dentry, attr); 2840 if (err) 2841 return err; 2842 2843 err = setattr_prepare(idmap, dentry, attr); 2844 if (err != 0) 2845 return err; 2846 2847 if ((attr->ia_valid & ATTR_SIZE) && 2848 attr->ia_size > max(i_size_read(inode), fsc->max_file_size)) 2849 return -EFBIG; 2850 2851 if ((attr->ia_valid & ATTR_SIZE) && 2852 ceph_quota_is_max_bytes_exceeded(inode, attr->ia_size)) 2853 return -EDQUOT; 2854 2855 err = __ceph_setattr(idmap, inode, attr, NULL); 2856 2857 if (err >= 0 && (attr->ia_valid & ATTR_MODE)) 2858 err = posix_acl_chmod(idmap, dentry, attr->ia_mode); 2859 2860 return err; 2861 } 2862 2863 int ceph_try_to_choose_auth_mds(struct inode *inode, int mask) 2864 { 2865 int issued = ceph_caps_issued(ceph_inode(inode)); 2866 2867 /* 2868 * If any 'x' caps is issued we can just choose the auth MDS 2869 * instead of the random replica MDSes. Because only when the 2870 * Locker is in LOCK_EXEC state will the loner client could 2871 * get the 'x' caps. And if we send the getattr requests to 2872 * any replica MDS it must auth pin and tries to rdlock from 2873 * the auth MDS, and then the auth MDS need to do the Locker 2874 * state transition to LOCK_SYNC. And after that the lock state 2875 * will change back. 2876 * 2877 * This cost much when doing the Locker state transition and 2878 * usually will need to revoke caps from clients. 2879 * 2880 * And for the 'Xs' caps for getxattr we will also choose the 2881 * auth MDS, because the MDS side code is buggy due to setxattr 2882 * won't notify the replica MDSes when the values changed and 2883 * the replica MDS will return the old values. Though we will 2884 * fix it in MDS code, but this still makes sense for old ceph. 2885 */ 2886 if (((mask & CEPH_CAP_ANY_SHARED) && (issued & CEPH_CAP_ANY_EXCL)) 2887 || (mask & (CEPH_STAT_RSTAT | CEPH_STAT_CAP_XATTR))) 2888 return USE_AUTH_MDS; 2889 else 2890 return USE_ANY_MDS; 2891 } 2892 2893 /* 2894 * Verify that we have a lease on the given mask. If not, 2895 * do a getattr against an mds. 2896 */ 2897 int __ceph_do_getattr(struct inode *inode, struct page *locked_page, 2898 int mask, bool force) 2899 { 2900 struct ceph_fs_client *fsc = ceph_sb_to_fs_client(inode->i_sb); 2901 struct ceph_client *cl = fsc->client; 2902 struct ceph_mds_client *mdsc = fsc->mdsc; 2903 struct ceph_mds_request *req; 2904 int mode; 2905 int err; 2906 2907 if (ceph_snap(inode) == CEPH_SNAPDIR) { 2908 doutc(cl, "inode %p %llx.%llx SNAPDIR\n", inode, 2909 ceph_vinop(inode)); 2910 return 0; 2911 } 2912 2913 doutc(cl, "inode %p %llx.%llx mask %s mode 0%o\n", inode, 2914 ceph_vinop(inode), ceph_cap_string(mask), inode->i_mode); 2915 if (!force && ceph_caps_issued_mask_metric(ceph_inode(inode), mask, 1)) 2916 return 0; 2917 2918 mode = ceph_try_to_choose_auth_mds(inode, mask); 2919 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, mode); 2920 if (IS_ERR(req)) 2921 return PTR_ERR(req); 2922 req->r_inode = inode; 2923 ihold(inode); 2924 req->r_num_caps = 1; 2925 req->r_args.getattr.mask = cpu_to_le32(mask); 2926 req->r_locked_page = locked_page; 2927 err = ceph_mdsc_do_request(mdsc, NULL, req); 2928 if (locked_page && err == 0) { 2929 u64 inline_version = req->r_reply_info.targeti.inline_version; 2930 if (inline_version == 0) { 2931 /* the reply is supposed to contain inline data */ 2932 err = -EINVAL; 2933 } else if (inline_version == CEPH_INLINE_NONE || 2934 inline_version == 1) { 2935 err = -ENODATA; 2936 } else { 2937 err = req->r_reply_info.targeti.inline_len; 2938 } 2939 } 2940 ceph_mdsc_put_request(req); 2941 doutc(cl, "result=%d\n", err); 2942 return err; 2943 } 2944 2945 int ceph_do_getvxattr(struct inode *inode, const char *name, void *value, 2946 size_t size) 2947 { 2948 struct ceph_fs_client *fsc = ceph_sb_to_fs_client(inode->i_sb); 2949 struct ceph_client *cl = fsc->client; 2950 struct ceph_mds_client *mdsc = fsc->mdsc; 2951 struct ceph_mds_request *req; 2952 int mode = USE_AUTH_MDS; 2953 int err; 2954 char *xattr_value; 2955 size_t xattr_value_len; 2956 2957 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETVXATTR, mode); 2958 if (IS_ERR(req)) { 2959 err = -ENOMEM; 2960 goto out; 2961 } 2962 2963 req->r_feature_needed = CEPHFS_FEATURE_OP_GETVXATTR; 2964 req->r_path2 = kstrdup(name, GFP_NOFS); 2965 if (!req->r_path2) { 2966 err = -ENOMEM; 2967 goto put; 2968 } 2969 2970 ihold(inode); 2971 req->r_inode = inode; 2972 err = ceph_mdsc_do_request(mdsc, NULL, req); 2973 if (err < 0) 2974 goto put; 2975 2976 xattr_value = req->r_reply_info.xattr_info.xattr_value; 2977 xattr_value_len = req->r_reply_info.xattr_info.xattr_value_len; 2978 2979 doutc(cl, "xattr_value_len:%zu, size:%zu\n", xattr_value_len, size); 2980 2981 err = (int)xattr_value_len; 2982 if (size == 0) 2983 goto put; 2984 2985 if (xattr_value_len > size) { 2986 err = -ERANGE; 2987 goto put; 2988 } 2989 2990 memcpy(value, xattr_value, xattr_value_len); 2991 put: 2992 ceph_mdsc_put_request(req); 2993 out: 2994 doutc(cl, "result=%d\n", err); 2995 return err; 2996 } 2997 2998 2999 /* 3000 * Check inode permissions. We verify we have a valid value for 3001 * the AUTH cap, then call the generic handler. 3002 */ 3003 int ceph_permission(struct mnt_idmap *idmap, struct inode *inode, 3004 int mask) 3005 { 3006 int err; 3007 3008 if (mask & MAY_NOT_BLOCK) 3009 return -ECHILD; 3010 3011 err = ceph_do_getattr(inode, CEPH_CAP_AUTH_SHARED, false); 3012 3013 if (!err) 3014 err = generic_permission(idmap, inode, mask); 3015 return err; 3016 } 3017 3018 /* Craft a mask of needed caps given a set of requested statx attrs. */ 3019 static int statx_to_caps(u32 want, umode_t mode) 3020 { 3021 int mask = 0; 3022 3023 if (want & (STATX_MODE|STATX_UID|STATX_GID|STATX_CTIME|STATX_BTIME|STATX_CHANGE_COOKIE)) 3024 mask |= CEPH_CAP_AUTH_SHARED; 3025 3026 if (want & (STATX_NLINK|STATX_CTIME|STATX_CHANGE_COOKIE)) { 3027 /* 3028 * The link count for directories depends on inode->i_subdirs, 3029 * and that is only updated when Fs caps are held. 3030 */ 3031 if (S_ISDIR(mode)) 3032 mask |= CEPH_CAP_FILE_SHARED; 3033 else 3034 mask |= CEPH_CAP_LINK_SHARED; 3035 } 3036 3037 if (want & (STATX_ATIME|STATX_MTIME|STATX_CTIME|STATX_SIZE|STATX_BLOCKS|STATX_CHANGE_COOKIE)) 3038 mask |= CEPH_CAP_FILE_SHARED; 3039 3040 if (want & (STATX_CTIME|STATX_CHANGE_COOKIE)) 3041 mask |= CEPH_CAP_XATTR_SHARED; 3042 3043 return mask; 3044 } 3045 3046 /* 3047 * Get all the attributes. If we have sufficient caps for the requested attrs, 3048 * then we can avoid talking to the MDS at all. 3049 */ 3050 int ceph_getattr(struct mnt_idmap *idmap, const struct path *path, 3051 struct kstat *stat, u32 request_mask, unsigned int flags) 3052 { 3053 struct inode *inode = d_inode(path->dentry); 3054 struct super_block *sb = inode->i_sb; 3055 struct ceph_inode_info *ci = ceph_inode(inode); 3056 u32 valid_mask = STATX_BASIC_STATS; 3057 int err = 0; 3058 3059 if (ceph_inode_is_shutdown(inode)) 3060 return -ESTALE; 3061 3062 /* Skip the getattr altogether if we're asked not to sync */ 3063 if ((flags & AT_STATX_SYNC_TYPE) != AT_STATX_DONT_SYNC) { 3064 err = ceph_do_getattr(inode, 3065 statx_to_caps(request_mask, inode->i_mode), 3066 flags & AT_STATX_FORCE_SYNC); 3067 if (err) 3068 return err; 3069 } 3070 3071 generic_fillattr(idmap, request_mask, inode, stat); 3072 stat->ino = ceph_present_inode(inode); 3073 3074 /* 3075 * btime on newly-allocated inodes is 0, so if this is still set to 3076 * that, then assume that it's not valid. 3077 */ 3078 if (ci->i_btime.tv_sec || ci->i_btime.tv_nsec) { 3079 stat->btime = ci->i_btime; 3080 valid_mask |= STATX_BTIME; 3081 } 3082 3083 if (request_mask & STATX_CHANGE_COOKIE) { 3084 stat->change_cookie = inode_peek_iversion_raw(inode); 3085 valid_mask |= STATX_CHANGE_COOKIE; 3086 } 3087 3088 if (ceph_snap(inode) == CEPH_NOSNAP) 3089 stat->dev = sb->s_dev; 3090 else 3091 stat->dev = ci->i_snapid_map ? ci->i_snapid_map->dev : 0; 3092 3093 if (S_ISDIR(inode->i_mode)) { 3094 if (ceph_test_mount_opt(ceph_sb_to_fs_client(sb), RBYTES)) { 3095 stat->size = ci->i_rbytes; 3096 } else if (ceph_snap(inode) == CEPH_SNAPDIR) { 3097 struct ceph_inode_info *pci; 3098 struct ceph_snap_realm *realm; 3099 struct inode *parent; 3100 3101 parent = ceph_lookup_inode(sb, ceph_ino(inode)); 3102 if (IS_ERR(parent)) 3103 return PTR_ERR(parent); 3104 3105 pci = ceph_inode(parent); 3106 spin_lock(&pci->i_ceph_lock); 3107 realm = pci->i_snap_realm; 3108 if (realm) 3109 stat->size = realm->num_snaps; 3110 else 3111 stat->size = 0; 3112 spin_unlock(&pci->i_ceph_lock); 3113 iput(parent); 3114 } else { 3115 stat->size = ci->i_files + ci->i_subdirs; 3116 } 3117 stat->blocks = 0; 3118 stat->blksize = 65536; 3119 /* 3120 * Some applications rely on the number of st_nlink 3121 * value on directories to be either 0 (if unlinked) 3122 * or 2 + number of subdirectories. 3123 */ 3124 if (stat->nlink == 1) 3125 /* '.' + '..' + subdirs */ 3126 stat->nlink = 1 + 1 + ci->i_subdirs; 3127 } 3128 3129 stat->attributes |= STATX_ATTR_CHANGE_MONOTONIC; 3130 if (IS_ENCRYPTED(inode)) 3131 stat->attributes |= STATX_ATTR_ENCRYPTED; 3132 stat->attributes_mask |= (STATX_ATTR_CHANGE_MONOTONIC | 3133 STATX_ATTR_ENCRYPTED); 3134 3135 stat->result_mask = request_mask & valid_mask; 3136 return err; 3137 } 3138 3139 void ceph_inode_shutdown(struct inode *inode) 3140 { 3141 struct ceph_inode_info *ci = ceph_inode(inode); 3142 struct rb_node *p; 3143 int iputs = 0; 3144 bool invalidate = false; 3145 3146 spin_lock(&ci->i_ceph_lock); 3147 ci->i_ceph_flags |= CEPH_I_SHUTDOWN; 3148 p = rb_first(&ci->i_caps); 3149 while (p) { 3150 struct ceph_cap *cap = rb_entry(p, struct ceph_cap, ci_node); 3151 3152 p = rb_next(p); 3153 iputs += ceph_purge_inode_cap(inode, cap, &invalidate); 3154 } 3155 spin_unlock(&ci->i_ceph_lock); 3156 3157 if (invalidate) 3158 ceph_queue_invalidate(inode); 3159 while (iputs--) 3160 iput(inode); 3161 } 3162