fs/ceph/inode.c

   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
  17 #include "super.h"
  18 #include "mds_client.h"
  19 #include "cache.h"
  20 #include <linux/ceph/decode.h>
  21
  22 /*
  23  * Ceph inode operations
  24  *
  25  * Implement basic inode helpers (get, alloc) and inode ops (getattr,
  26  * setattr, etc.), xattr helpers, and helpers for assimilating
  27  * metadata returned by the MDS into our cache.
  28  *
  29  * Also define helpers for doing asynchronous writeback, invalidation,
  30  * and truncation for the benefit of those who can't afford to block
  31  * (typically because they are in the message handler path).
  32  */
  33
  34 static const struct inode_operations ceph_symlink_iops;
  35
  36 static void ceph_inode_work(struct work_struct *work);
  37
  38 /*
  39  * find or create an inode, given the ceph ino number
  40  */
  41 static int ceph_set_ino_cb(struct inode *inode, void *data)
  42 {
  43         ceph_inode(inode)->i_vino = *(struct ceph_vino *)data;
  44         inode->i_ino = ceph_vino_to_ino(*(struct ceph_vino *)data);
  45         return 0;
  46 }
  47
  48 struct inode *ceph_get_inode(struct super_block *sb, struct ceph_vino vino)
  49 {
  50         struct inode *inode;
  51         ino_t t = ceph_vino_to_ino(vino);
  52
  53         inode = iget5_locked(sb, t, ceph_ino_compare, ceph_set_ino_cb, &vino);
  54         if (!inode)
  55                 return ERR_PTR(-ENOMEM);
  56         if (inode->i_state & I_NEW) {
  57                 dout("get_inode created new inode %p %llx.%llx ino %llx\n",
  58                      inode, ceph_vinop(inode), (u64)inode->i_ino);
  59                 unlock_new_inode(inode);
  60         }
  61
  62         dout("get_inode on %lu=%llx.%llx got %p\n", inode->i_ino, vino.ino,
  63              vino.snap, inode);
  64         return inode;
  65 }
  66
  67 /*
  68  * get/constuct snapdir inode for a given directory
  69  */
  70 struct inode *ceph_get_snapdir(struct inode *parent)
  71 {
  72         struct ceph_vino vino = {
  73                 .ino = ceph_ino(parent),
  74                 .snap = CEPH_SNAPDIR,
  75         };
  76         struct inode *inode = ceph_get_inode(parent->i_sb, vino);
  77         struct ceph_inode_info *ci = ceph_inode(inode);
  78
  79         BUG_ON(!S_ISDIR(parent->i_mode));
  80         if (IS_ERR(inode))
  81                 return inode;
  82         inode->i_mode = parent->i_mode;
  83         inode->i_uid = parent->i_uid;
  84         inode->i_gid = parent->i_gid;
  85         inode->i_op = &ceph_snapdir_iops;
  86         inode->i_fop = &ceph_snapdir_fops;
  87         ci->i_snap_caps = CEPH_CAP_PIN; /* so we can open */
  88         ci->i_rbytes = 0;
  89         return inode;
  90 }
  91
  92 const struct inode_operations ceph_file_iops = {
  93         .permission = ceph_permission,
  94         .setattr = ceph_setattr,
  95         .getattr = ceph_getattr,
  96         .listxattr = ceph_listxattr,
  97         .get_acl = ceph_get_acl,
  98         .set_acl = ceph_set_acl,
  99 };
 100
 101
 102 /*
 103  * We use a 'frag tree' to keep track of the MDS's directory fragments
 104  * for a given inode (usually there is just a single fragment).  We
 105  * need to know when a child frag is delegated to a new MDS, or when
 106  * it is flagged as replicated, so we can direct our requests
 107  * accordingly.
 108  */
 109
 110 /*
 111  * find/create a frag in the tree
 112  */
 113 static struct ceph_inode_frag *__get_or_create_frag(struct ceph_inode_info *ci,
 114                                                     u32 f)
 115 {
 116         struct rb_node **p;
 117         struct rb_node *parent = NULL;
 118         struct ceph_inode_frag *frag;
 119         int c;
 120
 121         p = &ci->i_fragtree.rb_node;
 122         while (*p) {
 123                 parent = *p;
 124                 frag = rb_entry(parent, struct ceph_inode_frag, node);
 125                 c = ceph_frag_compare(f, frag->frag);
 126                 if (c < 0)
 127                         p = &(*p)->rb_left;
 128                 else if (c > 0)
 129                         p = &(*p)->rb_right;
 130                 else
 131                         return frag;
 132         }
 133
 134         frag = kmalloc(sizeof(*frag), GFP_NOFS);
 135         if (!frag)
 136                 return ERR_PTR(-ENOMEM);
 137
 138         frag->frag = f;
 139         frag->split_by = 0;
 140         frag->mds = -1;
 141         frag->ndist = 0;
 142
 143         rb_link_node(&frag->node, parent, p);
 144         rb_insert_color(&frag->node, &ci->i_fragtree);
 145
 146         dout("get_or_create_frag added %llx.%llx frag %x\n",
 147              ceph_vinop(&ci->vfs_inode), f);
 148         return frag;
 149 }
 150
 151 /*
 152  * find a specific frag @f
 153  */
 154 struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci, u32 f)
 155 {
 156         struct rb_node *n = ci->i_fragtree.rb_node;
 157
 158         while (n) {
 159                 struct ceph_inode_frag *frag =
 160                         rb_entry(n, struct ceph_inode_frag, node);
 161                 int c = ceph_frag_compare(f, frag->frag);
 162                 if (c < 0)
 163                         n = n->rb_left;
 164                 else if (c > 0)
 165                         n = n->rb_right;
 166                 else
 167                         return frag;
 168         }
 169         return NULL;
 170 }
 171
 172 /*
 173  * Choose frag containing the given value @v.  If @pfrag is
 174  * specified, copy the frag delegation info to the caller if
 175  * it is present.
 176  */
 177 static u32 __ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
 178                               struct ceph_inode_frag *pfrag, int *found)
 179 {
 180         u32 t = ceph_frag_make(0, 0);
 181         struct ceph_inode_frag *frag;
 182         unsigned nway, i;
 183         u32 n;
 184
 185         if (found)
 186                 *found = 0;
 187
 188         while (1) {
 189                 WARN_ON(!ceph_frag_contains_value(t, v));
 190                 frag = __ceph_find_frag(ci, t);
 191                 if (!frag)
 192                         break; /* t is a leaf */
 193                 if (frag->split_by == 0) {
 194                         if (pfrag)
 195                                 memcpy(pfrag, frag, sizeof(*pfrag));
 196                         if (found)
 197                                 *found = 1;
 198                         break;
 199                 }
 200
 201                 /* choose child */
 202                 nway = 1 << frag->split_by;
 203                 dout("choose_frag(%x) %x splits by %d (%d ways)\n", v, t,
 204                      frag->split_by, nway);
 205                 for (i = 0; i < nway; i++) {
 206                         n = ceph_frag_make_child(t, frag->split_by, i);
 207                         if (ceph_frag_contains_value(n, v)) {
 208                                 t = n;
 209                                 break;
 210                         }
 211                 }
 212                 BUG_ON(i == nway);
 213         }
 214         dout("choose_frag(%x) = %x\n", v, t);
 215
 216         return t;
 217 }
 218
 219 u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
 220                      struct ceph_inode_frag *pfrag, int *found)
 221 {
 222         u32 ret;
 223         mutex_lock(&ci->i_fragtree_mutex);
 224         ret = __ceph_choose_frag(ci, v, pfrag, found);
 225         mutex_unlock(&ci->i_fragtree_mutex);
 226         return ret;
 227 }
 228
 229 /*
 230  * Process dirfrag (delegation) info from the mds.  Include leaf
 231  * fragment in tree ONLY if ndist > 0.  Otherwise, only
 232  * branches/splits are included in i_fragtree)
 233  */
 234 static int ceph_fill_dirfrag(struct inode *inode,
 235                              struct ceph_mds_reply_dirfrag *dirinfo)
 236 {
 237         struct ceph_inode_info *ci = ceph_inode(inode);
 238         struct ceph_inode_frag *frag;
 239         u32 id = le32_to_cpu(dirinfo->frag);
 240         int mds = le32_to_cpu(dirinfo->auth);
 241         int ndist = le32_to_cpu(dirinfo->ndist);
 242         int diri_auth = -1;
 243         int i;
 244         int err = 0;
 245
 246         spin_lock(&ci->i_ceph_lock);
 247         if (ci->i_auth_cap)
 248                 diri_auth = ci->i_auth_cap->mds;
 249         spin_unlock(&ci->i_ceph_lock);
 250
 251         if (mds == -1) /* CDIR_AUTH_PARENT */
 252                 mds = diri_auth;
 253
 254         mutex_lock(&ci->i_fragtree_mutex);
 255         if (ndist == 0 && mds == diri_auth) {
 256                 /* no delegation info needed. */
 257                 frag = __ceph_find_frag(ci, id);
 258                 if (!frag)
 259                         goto out;
 260                 if (frag->split_by == 0) {
 261                         /* tree leaf, remove */
 262                         dout("fill_dirfrag removed %llx.%llx frag %x"
 263                              " (no ref)\n", ceph_vinop(inode), id);
 264                         rb_erase(&frag->node, &ci->i_fragtree);
 265                         kfree(frag);
 266                 } else {
 267                         /* tree branch, keep and clear */
 268                         dout("fill_dirfrag cleared %llx.%llx frag %x"
 269                              " referral\n", ceph_vinop(inode), id);
 270                         frag->mds = -1;
 271                         frag->ndist = 0;
 272                 }
 273                 goto out;
 274         }
 275
 276
 277         /* find/add this frag to store mds delegation info */
 278         frag = __get_or_create_frag(ci, id);
 279         if (IS_ERR(frag)) {
 280                 /* this is not the end of the world; we can continue
 281                    with bad/inaccurate delegation info */
 282                 pr_err("fill_dirfrag ENOMEM on mds ref %llx.%llx fg %x\n",
 283                        ceph_vinop(inode), le32_to_cpu(dirinfo->frag));
 284                 err = -ENOMEM;
 285                 goto out;
 286         }
 287
 288         frag->mds = mds;
 289         frag->ndist = min_t(u32, ndist, CEPH_MAX_DIRFRAG_REP);
 290         for (i = 0; i < frag->ndist; i++)
 291                 frag->dist[i] = le32_to_cpu(dirinfo->dist[i]);
 292         dout("fill_dirfrag %llx.%llx frag %x ndist=%d\n",
 293              ceph_vinop(inode), frag->frag, frag->ndist);
 294
 295 out:
 296         mutex_unlock(&ci->i_fragtree_mutex);
 297         return err;
 298 }
 299
 300 static int frag_tree_split_cmp(const void *l, const void *r)
 301 {
 302         struct ceph_frag_tree_split *ls = (struct ceph_frag_tree_split*)l;
 303         struct ceph_frag_tree_split *rs = (struct ceph_frag_tree_split*)r;
 304         return ceph_frag_compare(le32_to_cpu(ls->frag),
 305                                  le32_to_cpu(rs->frag));
 306 }
 307
 308 static bool is_frag_child(u32 f, struct ceph_inode_frag *frag)
 309 {
 310         if (!frag)
 311                 return f == ceph_frag_make(0, 0);
 312         if (ceph_frag_bits(f) != ceph_frag_bits(frag->frag) + frag->split_by)
 313                 return false;
 314         return ceph_frag_contains_value(frag->frag, ceph_frag_value(f));
 315 }
 316
 317 static int ceph_fill_fragtree(struct inode *inode,
 318                               struct ceph_frag_tree_head *fragtree,
 319                               struct ceph_mds_reply_dirfrag *dirinfo)
 320 {
 321         struct ceph_inode_info *ci = ceph_inode(inode);
 322         struct ceph_inode_frag *frag, *prev_frag = NULL;
 323         struct rb_node *rb_node;
 324         unsigned i, split_by, nsplits;
 325         u32 id;
 326         bool update = false;
 327
 328         mutex_lock(&ci->i_fragtree_mutex);
 329         nsplits = le32_to_cpu(fragtree->nsplits);
 330         if (nsplits != ci->i_fragtree_nsplits) {
 331                 update = true;
 332         } else if (nsplits) {
 333                 i = prandom_u32() % nsplits;
 334                 id = le32_to_cpu(fragtree->splits[i].frag);
 335                 if (!__ceph_find_frag(ci, id))
 336                         update = true;
 337         } else if (!RB_EMPTY_ROOT(&ci->i_fragtree)) {
 338                 rb_node = rb_first(&ci->i_fragtree);
 339                 frag = rb_entry(rb_node, struct ceph_inode_frag, node);
 340                 if (frag->frag != ceph_frag_make(0, 0) || rb_next(rb_node))
 341                         update = true;
 342         }
 343         if (!update && dirinfo) {
 344                 id = le32_to_cpu(dirinfo->frag);
 345                 if (id != __ceph_choose_frag(ci, id, NULL, NULL))
 346                         update = true;
 347         }
 348         if (!update)
 349                 goto out_unlock;
 350
 351         if (nsplits > 1) {
 352                 sort(fragtree->splits, nsplits, sizeof(fragtree->splits[0]),
 353                      frag_tree_split_cmp, NULL);
 354         }
 355
 356         dout("fill_fragtree %llx.%llx\n", ceph_vinop(inode));
 357         rb_node = rb_first(&ci->i_fragtree);
 358         for (i = 0; i < nsplits; i++) {
 359                 id = le32_to_cpu(fragtree->splits[i].frag);
 360                 split_by = le32_to_cpu(fragtree->splits[i].by);
 361                 if (split_by == 0 || ceph_frag_bits(id) + split_by > 24) {
 362                         pr_err("fill_fragtree %llx.%llx invalid split %d/%u, "
 363                                "frag %x split by %d\n", ceph_vinop(inode),
 364                                i, nsplits, id, split_by);
 365                         continue;
 366                 }
 367                 frag = NULL;
 368                 while (rb_node) {
 369                         frag = rb_entry(rb_node, struct ceph_inode_frag, node);
 370                         if (ceph_frag_compare(frag->frag, id) >= 0) {
 371                                 if (frag->frag != id)
 372                                         frag = NULL;
 373                                 else
 374                                         rb_node = rb_next(rb_node);
 375                                 break;
 376                         }
 377                         rb_node = rb_next(rb_node);
 378                         /* delete stale split/leaf node */
 379                         if (frag->split_by > 0 ||
 380                             !is_frag_child(frag->frag, prev_frag)) {
 381                                 rb_erase(&frag->node, &ci->i_fragtree);
 382                                 if (frag->split_by > 0)
 383                                         ci->i_fragtree_nsplits--;
 384                                 kfree(frag);
 385                         }
 386                         frag = NULL;
 387                 }
 388                 if (!frag) {
 389                         frag = __get_or_create_frag(ci, id);
 390                         if (IS_ERR(frag))
 391                                 continue;
 392                 }
 393                 if (frag->split_by == 0)
 394                         ci->i_fragtree_nsplits++;
 395                 frag->split_by = split_by;
 396                 dout(" frag %x split by %d\n", frag->frag, frag->split_by);
 397                 prev_frag = frag;
 398         }
 399         while (rb_node) {
 400                 frag = rb_entry(rb_node, struct ceph_inode_frag, node);
 401                 rb_node = rb_next(rb_node);
 402                 /* delete stale split/leaf node */
 403                 if (frag->split_by > 0 ||
 404                     !is_frag_child(frag->frag, prev_frag)) {
 405                         rb_erase(&frag->node, &ci->i_fragtree);
 406                         if (frag->split_by > 0)
 407                                 ci->i_fragtree_nsplits--;
 408                         kfree(frag);
 409                 }
 410         }
 411 out_unlock:
 412         mutex_unlock(&ci->i_fragtree_mutex);
 413         return 0;
 414 }
 415
 416 /*
 417  * initialize a newly allocated inode.
 418  */
 419 struct inode *ceph_alloc_inode(struct super_block *sb)
 420 {
 421         struct ceph_inode_info *ci;
 422         int i;
 423
 424         ci = kmem_cache_alloc(ceph_inode_cachep, GFP_NOFS);
 425         if (!ci)
 426                 return NULL;
 427
 428         dout("alloc_inode %p\n", &ci->vfs_inode);
 429
 430         spin_lock_init(&ci->i_ceph_lock);
 431
 432         ci->i_version = 0;
 433         ci->i_inline_version = 0;
 434         ci->i_time_warp_seq = 0;
 435         ci->i_ceph_flags = 0;
 436         atomic64_set(&ci->i_ordered_count, 1);
 437         atomic64_set(&ci->i_release_count, 1);
 438         atomic64_set(&ci->i_complete_seq[0], 0);
 439         atomic64_set(&ci->i_complete_seq[1], 0);
 440         ci->i_symlink = NULL;
 441
 442         ci->i_max_bytes = 0;
 443         ci->i_max_files = 0;
 444
 445         memset(&ci->i_dir_layout, 0, sizeof(ci->i_dir_layout));
 446         RCU_INIT_POINTER(ci->i_layout.pool_ns, NULL);
 447
 448         ci->i_fragtree = RB_ROOT;
 449         mutex_init(&ci->i_fragtree_mutex);
 450
 451         ci->i_xattrs.blob = NULL;
 452         ci->i_xattrs.prealloc_blob = NULL;
 453         ci->i_xattrs.dirty = false;
 454         ci->i_xattrs.index = RB_ROOT;
 455         ci->i_xattrs.count = 0;
 456         ci->i_xattrs.names_size = 0;
 457         ci->i_xattrs.vals_size = 0;
 458         ci->i_xattrs.version = 0;
 459         ci->i_xattrs.index_version = 0;
 460
 461         ci->i_caps = RB_ROOT;
 462         ci->i_auth_cap = NULL;
 463         ci->i_dirty_caps = 0;
 464         ci->i_flushing_caps = 0;
 465         INIT_LIST_HEAD(&ci->i_dirty_item);
 466         INIT_LIST_HEAD(&ci->i_flushing_item);
 467         ci->i_prealloc_cap_flush = NULL;
 468         INIT_LIST_HEAD(&ci->i_cap_flush_list);
 469         init_waitqueue_head(&ci->i_cap_wq);
 470         ci->i_hold_caps_min = 0;
 471         ci->i_hold_caps_max = 0;
 472         INIT_LIST_HEAD(&ci->i_cap_delay_list);
 473         INIT_LIST_HEAD(&ci->i_cap_snaps);
 474         ci->i_head_snapc = NULL;
 475         ci->i_snap_caps = 0;
 476
 477         for (i = 0; i < CEPH_FILE_MODE_BITS; i++)
 478                 ci->i_nr_by_mode[i] = 0;
 479
 480         mutex_init(&ci->i_truncate_mutex);
 481         ci->i_truncate_seq = 0;
 482         ci->i_truncate_size = 0;
 483         ci->i_truncate_pending = 0;
 484
 485         ci->i_max_size = 0;
 486         ci->i_reported_size = 0;
 487         ci->i_wanted_max_size = 0;
 488         ci->i_requested_max_size = 0;
 489
 490         ci->i_pin_ref = 0;
 491         ci->i_rd_ref = 0;
 492         ci->i_rdcache_ref = 0;
 493         ci->i_wr_ref = 0;
 494         ci->i_wb_ref = 0;
 495         ci->i_wrbuffer_ref = 0;
 496         ci->i_wrbuffer_ref_head = 0;
 497         atomic_set(&ci->i_filelock_ref, 0);
 498         atomic_set(&ci->i_shared_gen, 1);
 499         ci->i_rdcache_gen = 0;
 500         ci->i_rdcache_revoking = 0;
 501
 502         INIT_LIST_HEAD(&ci->i_unsafe_dirops);
 503         INIT_LIST_HEAD(&ci->i_unsafe_iops);
 504         spin_lock_init(&ci->i_unsafe_lock);
 505
 506         ci->i_snap_realm = NULL;
 507         INIT_LIST_HEAD(&ci->i_snap_realm_item);
 508         INIT_LIST_HEAD(&ci->i_snap_flush_item);
 509
 510         INIT_WORK(&ci->i_work, ceph_inode_work);
 511         ci->i_work_mask = 0;
 512
 513         ceph_fscache_inode_init(ci);
 514
 515         return &ci->vfs_inode;
 516 }
 517
 518 void ceph_free_inode(struct inode *inode)
 519 {
 520         struct ceph_inode_info *ci = ceph_inode(inode);
 521
 522         kfree(ci->i_symlink);
 523         kmem_cache_free(ceph_inode_cachep, ci);
 524 }
 525
 526 void ceph_destroy_inode(struct inode *inode)
 527 {
 528         struct ceph_inode_info *ci = ceph_inode(inode);
 529         struct ceph_inode_frag *frag;
 530         struct rb_node *n;
 531
 532         dout("destroy_inode %p ino %llx.%llx\n", inode, ceph_vinop(inode));
 533
 534         ceph_fscache_unregister_inode_cookie(ci);
 535
 536         __ceph_remove_caps(inode);
 537
 538         if (__ceph_has_any_quota(ci))
 539                 ceph_adjust_quota_realms_count(inode, false);
 540
 541         /*
 542          * we may still have a snap_realm reference if there are stray
 543          * caps in i_snap_caps.
 544          */
 545         if (ci->i_snap_realm) {
 546                 struct ceph_mds_client *mdsc =
 547                                         ceph_inode_to_client(inode)->mdsc;
 548                 if (ceph_snap(inode) == CEPH_NOSNAP) {
 549                         struct ceph_snap_realm *realm = ci->i_snap_realm;
 550                         dout(" dropping residual ref to snap realm %p\n",
 551                              realm);
 552                         spin_lock(&realm->inodes_with_caps_lock);
 553                         list_del_init(&ci->i_snap_realm_item);
 554                         ci->i_snap_realm = NULL;
 555                         if (realm->ino == ci->i_vino.ino)
 556                                 realm->inode = NULL;
 557                         spin_unlock(&realm->inodes_with_caps_lock);
 558                         ceph_put_snap_realm(mdsc, realm);
 559                 } else {
 560                         ceph_put_snapid_map(mdsc, ci->i_snapid_map);
 561                         ci->i_snap_realm = NULL;
 562                 }
 563         }
 564
 565         while ((n = rb_first(&ci->i_fragtree)) != NULL) {
 566                 frag = rb_entry(n, struct ceph_inode_frag, node);
 567                 rb_erase(n, &ci->i_fragtree);
 568                 kfree(frag);
 569         }
 570         ci->i_fragtree_nsplits = 0;
 571
 572         __ceph_destroy_xattrs(ci);
 573         if (ci->i_xattrs.blob)
 574                 ceph_buffer_put(ci->i_xattrs.blob);
 575         if (ci->i_xattrs.prealloc_blob)
 576                 ceph_buffer_put(ci->i_xattrs.prealloc_blob);
 577
 578         ceph_put_string(rcu_dereference_raw(ci->i_layout.pool_ns));
 579 }
 580
 581 int ceph_drop_inode(struct inode *inode)
 582 {
 583         /*
 584          * Positve dentry and corresponding inode are always accompanied
 585          * in MDS reply. So no need to keep inode in the cache after
 586          * dropping all its aliases.
 587          */
 588         return 1;
 589 }
 590
 591 static inline blkcnt_t calc_inode_blocks(u64 size)
 592 {
 593         return (size + (1<<9) - 1) >> 9;
 594 }
 595
 596 /*
 597  * Helpers to fill in size, ctime, mtime, and atime.  We have to be
 598  * careful because either the client or MDS may have more up to date
 599  * info, depending on which capabilities are held, and whether
 600  * time_warp_seq or truncate_seq have increased.  (Ordinarily, mtime
 601  * and size are monotonically increasing, except when utimes() or
 602  * truncate() increments the corresponding _seq values.)
 603  */
 604 int ceph_fill_file_size(struct inode *inode, int issued,
 605                         u32 truncate_seq, u64 truncate_size, u64 size)
 606 {
 607         struct ceph_inode_info *ci = ceph_inode(inode);
 608         int queue_trunc = 0;
 609
 610         if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) > 0 ||
 611             (truncate_seq == ci->i_truncate_seq && size > inode->i_size)) {
 612                 dout("size %lld -> %llu\n", inode->i_size, size);
 613                 if (size > 0 && S_ISDIR(inode->i_mode)) {
 614                         pr_err("fill_file_size non-zero size for directory\n");
 615                         size = 0;
 616                 }
 617                 i_size_write(inode, size);
 618                 inode->i_blocks = calc_inode_blocks(size);
 619                 ci->i_reported_size = size;
 620                 if (truncate_seq != ci->i_truncate_seq) {
 621                         dout("truncate_seq %u -> %u\n",
 622                              ci->i_truncate_seq, truncate_seq);
 623                         ci->i_truncate_seq = truncate_seq;
 624
 625                         /* the MDS should have revoked these caps */
 626                         WARN_ON_ONCE(issued & (CEPH_CAP_FILE_EXCL |
 627                                                CEPH_CAP_FILE_RD |
 628                                                CEPH_CAP_FILE_WR |
 629                                                CEPH_CAP_FILE_LAZYIO));
 630                         /*
 631                          * If we hold relevant caps, or in the case where we're
 632                          * not the only client referencing this file and we
 633                          * don't hold those caps, then we need to check whether
 634                          * the file is either opened or mmaped
 635                          */
 636                         if ((issued & (CEPH_CAP_FILE_CACHE|
 637                                        CEPH_CAP_FILE_BUFFER)) ||
 638                             mapping_mapped(inode->i_mapping) ||
 639                             __ceph_caps_file_wanted(ci)) {
 640                                 ci->i_truncate_pending++;
 641                                 queue_trunc = 1;
 642                         }
 643                 }
 644         }
 645         if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) >= 0 &&
 646             ci->i_truncate_size != truncate_size) {
 647                 dout("truncate_size %lld -> %llu\n", ci->i_truncate_size,
 648                      truncate_size);
 649                 ci->i_truncate_size = truncate_size;
 650         }
 651
 652         if (queue_trunc)
 653                 ceph_fscache_invalidate(inode);
 654
 655         return queue_trunc;
 656 }
 657
 658 void ceph_fill_file_time(struct inode *inode, int issued,
 659                          u64 time_warp_seq, struct timespec64 *ctime,
 660                          struct timespec64 *mtime, struct timespec64 *atime)
 661 {
 662         struct ceph_inode_info *ci = ceph_inode(inode);
 663         int warn = 0;
 664
 665         if (issued & (CEPH_CAP_FILE_EXCL|
 666                       CEPH_CAP_FILE_WR|
 667                       CEPH_CAP_FILE_BUFFER|
 668                       CEPH_CAP_AUTH_EXCL|
 669                       CEPH_CAP_XATTR_EXCL)) {
 670                 if (ci->i_version == 0 ||
 671                     timespec64_compare(ctime, &inode->i_ctime) > 0) {
 672                         dout("ctime %lld.%09ld -> %lld.%09ld inc w/ cap\n",
 673                              inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
 674                              ctime->tv_sec, ctime->tv_nsec);
 675                         inode->i_ctime = *ctime;
 676                 }
 677                 if (ci->i_version == 0 ||
 678                     ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) > 0) {
 679                         /* the MDS did a utimes() */
 680                         dout("mtime %lld.%09ld -> %lld.%09ld "
 681                              "tw %d -> %d\n",
 682                              inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
 683                              mtime->tv_sec, mtime->tv_nsec,
 684                              ci->i_time_warp_seq, (int)time_warp_seq);
 685
 686                         inode->i_mtime = *mtime;
 687                         inode->i_atime = *atime;
 688                         ci->i_time_warp_seq = time_warp_seq;
 689                 } else if (time_warp_seq == ci->i_time_warp_seq) {
 690                         /* nobody did utimes(); take the max */
 691                         if (timespec64_compare(mtime, &inode->i_mtime) > 0) {
 692                                 dout("mtime %lld.%09ld -> %lld.%09ld inc\n",
 693                                      inode->i_mtime.tv_sec,
 694                                      inode->i_mtime.tv_nsec,
 695                                      mtime->tv_sec, mtime->tv_nsec);
 696                                 inode->i_mtime = *mtime;
 697                         }
 698                         if (timespec64_compare(atime, &inode->i_atime) > 0) {
 699                                 dout("atime %lld.%09ld -> %lld.%09ld inc\n",
 700                                      inode->i_atime.tv_sec,
 701                                      inode->i_atime.tv_nsec,
 702                                      atime->tv_sec, atime->tv_nsec);
 703                                 inode->i_atime = *atime;
 704                         }
 705                 } else if (issued & CEPH_CAP_FILE_EXCL) {
 706                         /* we did a utimes(); ignore mds values */
 707                 } else {
 708                         warn = 1;
 709                 }
 710         } else {
 711                 /* we have no write|excl caps; whatever the MDS says is true */
 712                 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) >= 0) {
 713                         inode->i_ctime = *ctime;
 714                         inode->i_mtime = *mtime;
 715                         inode->i_atime = *atime;
 716                         ci->i_time_warp_seq = time_warp_seq;
 717                 } else {
 718                         warn = 1;
 719                 }
 720         }
 721         if (warn) /* time_warp_seq shouldn't go backwards */
 722                 dout("%p mds time_warp_seq %llu < %u\n",
 723                      inode, time_warp_seq, ci->i_time_warp_seq);
 724 }
 725
 726 /*
 727  * Populate an inode based on info from mds.  May be called on new or
 728  * existing inodes.
 729  */
 730 static int fill_inode(struct inode *inode, struct page *locked_page,
 731                       struct ceph_mds_reply_info_in *iinfo,
 732                       struct ceph_mds_reply_dirfrag *dirinfo,
 733                       struct ceph_mds_session *session,
 734                       unsigned long ttl_from, int cap_fmode,
 735                       struct ceph_cap_reservation *caps_reservation)
 736 {
 737         struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
 738         struct ceph_mds_reply_inode *info = iinfo->in;
 739         struct ceph_inode_info *ci = ceph_inode(inode);
 740         int issued, new_issued, info_caps;
 741         struct timespec64 mtime, atime, ctime;
 742         struct ceph_buffer *xattr_blob = NULL;
 743         struct ceph_string *pool_ns = NULL;
 744         struct ceph_cap *new_cap = NULL;
 745         int err = 0;
 746         bool wake = false;
 747         bool queue_trunc = false;
 748         bool new_version = false;
 749         bool fill_inline = false;
 750
 751         dout("fill_inode %p ino %llx.%llx v %llu had %llu\n",
 752              inode, ceph_vinop(inode), le64_to_cpu(info->version),
 753              ci->i_version);
 754
 755         info_caps = le32_to_cpu(info->cap.caps);
 756
 757         /* prealloc new cap struct */
 758         if (info_caps && ceph_snap(inode) == CEPH_NOSNAP)
 759                 new_cap = ceph_get_cap(mdsc, caps_reservation);
 760
 761         /*
 762          * prealloc xattr data, if it looks like we'll need it.  only
 763          * if len > 4 (meaning there are actually xattrs; the first 4
 764          * bytes are the xattr count).
 765          */
 766         if (iinfo->xattr_len > 4) {
 767                 xattr_blob = ceph_buffer_new(iinfo->xattr_len, GFP_NOFS);
 768                 if (!xattr_blob)
 769                         pr_err("fill_inode ENOMEM xattr blob %d bytes\n",
 770                                iinfo->xattr_len);
 771         }
 772
 773         if (iinfo->pool_ns_len > 0)
 774                 pool_ns = ceph_find_or_create_string(iinfo->pool_ns_data,
 775                                                      iinfo->pool_ns_len);
 776
 777         if (ceph_snap(inode) != CEPH_NOSNAP && !ci->i_snapid_map)
 778                 ci->i_snapid_map = ceph_get_snapid_map(mdsc, ceph_snap(inode));
 779
 780         spin_lock(&ci->i_ceph_lock);
 781
 782         /*
 783          * provided version will be odd if inode value is projected,
 784          * even if stable.  skip the update if we have newer stable
 785          * info (ours>=theirs, e.g. due to racing mds replies), unless
 786          * we are getting projected (unstable) info (in which case the
 787          * version is odd, and we want ours>theirs).
 788          *   us   them
 789          *   2    2     skip
 790          *   3    2     skip
 791          *   3    3     update
 792          */
 793         if (ci->i_version == 0 ||
 794             ((info->cap.flags & CEPH_CAP_FLAG_AUTH) &&
 795              le64_to_cpu(info->version) > (ci->i_version & ~1)))
 796                 new_version = true;
 797
 798         __ceph_caps_issued(ci, &issued);
 799         issued |= __ceph_caps_dirty(ci);
 800         new_issued = ~issued & info_caps;
 801
 802         /* update inode */
 803         inode->i_rdev = le32_to_cpu(info->rdev);
 804         inode->i_blkbits = fls(le32_to_cpu(info->layout.fl_stripe_unit)) - 1;
 805
 806         __ceph_update_quota(ci, iinfo->max_bytes, iinfo->max_files);
 807
 808         if ((new_version || (new_issued & CEPH_CAP_AUTH_SHARED)) &&
 809             (issued & CEPH_CAP_AUTH_EXCL) == 0) {
 810                 inode->i_mode = le32_to_cpu(info->mode);
 811                 inode->i_uid = make_kuid(&init_user_ns, le32_to_cpu(info->uid));
 812                 inode->i_gid = make_kgid(&init_user_ns, le32_to_cpu(info->gid));
 813                 dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode,
 814                      from_kuid(&init_user_ns, inode->i_uid),
 815                      from_kgid(&init_user_ns, inode->i_gid));
 816         }
 817
 818         if ((new_version || (new_issued & CEPH_CAP_LINK_SHARED)) &&
 819             (issued & CEPH_CAP_LINK_EXCL) == 0)
 820                 set_nlink(inode, le32_to_cpu(info->nlink));
 821
 822         if (new_version || (new_issued & CEPH_CAP_ANY_RD)) {
 823                 /* be careful with mtime, atime, size */
 824                 ceph_decode_timespec64(&atime, &info->atime);
 825                 ceph_decode_timespec64(&mtime, &info->mtime);
 826                 ceph_decode_timespec64(&ctime, &info->ctime);
 827                 ceph_fill_file_time(inode, issued,
 828                                 le32_to_cpu(info->time_warp_seq),
 829                                 &ctime, &mtime, &atime);
 830         }
 831
 832         if (new_version || (info_caps & CEPH_CAP_FILE_SHARED)) {
 833                 ci->i_files = le64_to_cpu(info->files);
 834                 ci->i_subdirs = le64_to_cpu(info->subdirs);
 835         }
 836
 837         if (new_version ||
 838             (new_issued & (CEPH_CAP_ANY_FILE_RD | CEPH_CAP_ANY_FILE_WR))) {
 839                 s64 old_pool = ci->i_layout.pool_id;
 840                 struct ceph_string *old_ns;
 841
 842                 ceph_file_layout_from_legacy(&ci->i_layout, &info->layout);
 843                 old_ns = rcu_dereference_protected(ci->i_layout.pool_ns,
 844                                         lockdep_is_held(&ci->i_ceph_lock));
 845                 rcu_assign_pointer(ci->i_layout.pool_ns, pool_ns);
 846
 847                 if (ci->i_layout.pool_id != old_pool || pool_ns != old_ns)
 848                         ci->i_ceph_flags &= ~CEPH_I_POOL_PERM;
 849
 850                 pool_ns = old_ns;
 851
 852                 queue_trunc = ceph_fill_file_size(inode, issued,
 853                                         le32_to_cpu(info->truncate_seq),
 854                                         le64_to_cpu(info->truncate_size),
 855                                         le64_to_cpu(info->size));
 856                 /* only update max_size on auth cap */
 857                 if ((info->cap.flags & CEPH_CAP_FLAG_AUTH) &&
 858                     ci->i_max_size != le64_to_cpu(info->max_size)) {
 859                         dout("max_size %lld -> %llu\n", ci->i_max_size,
 860                                         le64_to_cpu(info->max_size));
 861                         ci->i_max_size = le64_to_cpu(info->max_size);
 862                 }
 863         }
 864
 865         /* layout and rstat are not tracked by capability, update them if
 866          * the inode info is from auth mds */
 867         if (new_version || (info->cap.flags & CEPH_CAP_FLAG_AUTH)) {
 868                 if (S_ISDIR(inode->i_mode)) {
 869                         ci->i_dir_layout = iinfo->dir_layout;
 870                         ci->i_rbytes = le64_to_cpu(info->rbytes);
 871                         ci->i_rfiles = le64_to_cpu(info->rfiles);
 872                         ci->i_rsubdirs = le64_to_cpu(info->rsubdirs);
 873                         ci->i_dir_pin = iinfo->dir_pin;
 874                         ceph_decode_timespec64(&ci->i_rctime, &info->rctime);
 875                 }
 876         }
 877
 878         /* xattrs */
 879         /* note that if i_xattrs.len <= 4, i_xattrs.data will still be NULL. */
 880         if ((ci->i_xattrs.version == 0 || !(issued & CEPH_CAP_XATTR_EXCL))  &&
 881             le64_to_cpu(info->xattr_version) > ci->i_xattrs.version) {
 882                 if (ci->i_xattrs.blob)
 883                         ceph_buffer_put(ci->i_xattrs.blob);
 884                 ci->i_xattrs.blob = xattr_blob;
 885                 if (xattr_blob)
 886                         memcpy(ci->i_xattrs.blob->vec.iov_base,
 887                                iinfo->xattr_data, iinfo->xattr_len);
 888                 ci->i_xattrs.version = le64_to_cpu(info->xattr_version);
 889                 ceph_forget_all_cached_acls(inode);
 890                 xattr_blob = NULL;
 891         }
 892
 893         /* finally update i_version */
 894         if (le64_to_cpu(info->version) > ci->i_version)
 895                 ci->i_version = le64_to_cpu(info->version);
 896
 897         inode->i_mapping->a_ops = &ceph_aops;
 898
 899         switch (inode->i_mode & S_IFMT) {
 900         case S_IFIFO:
 901         case S_IFBLK:
 902         case S_IFCHR:
 903         case S_IFSOCK:
 904                 inode->i_blkbits = PAGE_SHIFT;
 905                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
 906                 inode->i_op = &ceph_file_iops;
 907                 break;
 908         case S_IFREG:
 909                 inode->i_op = &ceph_file_iops;
 910                 inode->i_fop = &ceph_file_fops;
 911                 break;
 912         case S_IFLNK:
 913                 inode->i_op = &ceph_symlink_iops;
 914                 if (!ci->i_symlink) {
 915                         u32 symlen = iinfo->symlink_len;
 916                         char *sym;
 917
 918                         spin_unlock(&ci->i_ceph_lock);
 919
 920                         if (symlen != i_size_read(inode)) {
 921                                 pr_err("fill_inode %llx.%llx BAD symlink "
 922                                         "size %lld\n", ceph_vinop(inode),
 923                                         i_size_read(inode));
 924                                 i_size_write(inode, symlen);
 925                                 inode->i_blocks = calc_inode_blocks(symlen);
 926                         }
 927
 928                         err = -ENOMEM;
 929                         sym = kstrndup(iinfo->symlink, symlen, GFP_NOFS);
 930                         if (!sym)
 931                                 goto out;
 932
 933                         spin_lock(&ci->i_ceph_lock);
 934                         if (!ci->i_symlink)
 935                                 ci->i_symlink = sym;
 936                         else
 937                                 kfree(sym); /* lost a race */
 938                 }
 939                 inode->i_link = ci->i_symlink;
 940                 break;
 941         case S_IFDIR:
 942                 inode->i_op = &ceph_dir_iops;
 943                 inode->i_fop = &ceph_dir_fops;
 944                 break;
 945         default:
 946                 pr_err("fill_inode %llx.%llx BAD mode 0%o\n",
 947                        ceph_vinop(inode), inode->i_mode);
 948         }
 949
 950         /* were we issued a capability? */
 951         if (info_caps) {
 952                 if (ceph_snap(inode) == CEPH_NOSNAP) {
 953                         ceph_add_cap(inode, session,
 954                                      le64_to_cpu(info->cap.cap_id),
 955                                      cap_fmode, info_caps,
 956                                      le32_to_cpu(info->cap.wanted),
 957                                      le32_to_cpu(info->cap.seq),
 958                                      le32_to_cpu(info->cap.mseq),
 959                                      le64_to_cpu(info->cap.realm),
 960                                      info->cap.flags, &new_cap);
 961
 962                         /* set dir completion flag? */
 963                         if (S_ISDIR(inode->i_mode) &&
 964                             ci->i_files == 0 && ci->i_subdirs == 0 &&
 965                             (info_caps & CEPH_CAP_FILE_SHARED) &&
 966                             (issued & CEPH_CAP_FILE_EXCL) == 0 &&
 967                             !__ceph_dir_is_complete(ci)) {
 968                                 dout(" marking %p complete (empty)\n", inode);
 969                                 i_size_write(inode, 0);
 970                                 __ceph_dir_set_complete(ci,
 971                                         atomic64_read(&ci->i_release_count),
 972                                         atomic64_read(&ci->i_ordered_count));
 973                         }
 974
 975                         wake = true;
 976                 } else {
 977                         dout(" %p got snap_caps %s\n", inode,
 978                              ceph_cap_string(info_caps));
 979                         ci->i_snap_caps |= info_caps;
 980                         if (cap_fmode >= 0)
 981                                 __ceph_get_fmode(ci, cap_fmode);
 982                 }
 983         } else if (cap_fmode >= 0) {
 984                 pr_warn("mds issued no caps on %llx.%llx\n",
 985                            ceph_vinop(inode));
 986                 __ceph_get_fmode(ci, cap_fmode);
 987         }
 988
 989         if (iinfo->inline_version > 0 &&
 990             iinfo->inline_version >= ci->i_inline_version) {
 991                 int cache_caps = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO;
 992                 ci->i_inline_version = iinfo->inline_version;
 993                 if (ci->i_inline_version != CEPH_INLINE_NONE &&
 994                     (locked_page || (info_caps & cache_caps)))
 995                         fill_inline = true;
 996         }
 997
 998         spin_unlock(&ci->i_ceph_lock);
 999
1000         if (fill_inline)
1001                 ceph_fill_inline_data(inode, locked_page,
1002                                       iinfo->inline_data, iinfo->inline_len);
1003
1004         if (wake)
1005                 wake_up_all(&ci->i_cap_wq);
1006
1007         /* queue truncate if we saw i_size decrease */
1008         if (queue_trunc)
1009                 ceph_queue_vmtruncate(inode);
1010
1011         /* populate frag tree */
1012         if (S_ISDIR(inode->i_mode))
1013                 ceph_fill_fragtree(inode, &info->fragtree, dirinfo);
1014
1015         /* update delegation info? */
1016         if (dirinfo)
1017                 ceph_fill_dirfrag(inode, dirinfo);
1018
1019         err = 0;
1020 out:
1021         if (new_cap)
1022                 ceph_put_cap(mdsc, new_cap);
1023         if (xattr_blob)
1024                 ceph_buffer_put(xattr_blob);
1025         ceph_put_string(pool_ns);
1026         return err;
1027 }
1028
1029 /*
1030  * caller should hold session s_mutex.
1031  */
1032 static void update_dentry_lease(struct dentry *dentry,
1033                                 struct ceph_mds_reply_lease *lease,
1034                                 struct ceph_mds_session *session,
1035                                 unsigned long from_time,
1036                                 struct ceph_vino *tgt_vino,
1037                                 struct ceph_vino *dir_vino)
1038 {
1039         struct ceph_dentry_info *di = ceph_dentry(dentry);
1040         long unsigned duration = le32_to_cpu(lease->duration_ms);
1041         long unsigned ttl = from_time + (duration * HZ) / 1000;
1042         long unsigned half_ttl = from_time + (duration * HZ / 2) / 1000;
1043         struct inode *dir;
1044         struct ceph_mds_session *old_lease_session = NULL;
1045
1046         /*
1047          * Make sure dentry's inode matches tgt_vino. NULL tgt_vino means that
1048          * we expect a negative dentry.
1049          */
1050         if (!tgt_vino && d_really_is_positive(dentry))
1051                 return;
1052
1053         if (tgt_vino && (d_really_is_negative(dentry) ||
1054                         !ceph_ino_compare(d_inode(dentry), tgt_vino)))
1055                 return;
1056
1057         spin_lock(&dentry->d_lock);
1058         dout("update_dentry_lease %p duration %lu ms ttl %lu\n",
1059              dentry, duration, ttl);
1060
1061         dir = d_inode(dentry->d_parent);
1062
1063         /* make sure parent matches dir_vino */
1064         if (!ceph_ino_compare(dir, dir_vino))
1065                 goto out_unlock;
1066
1067         /* only track leases on regular dentries */
1068         if (ceph_snap(dir) != CEPH_NOSNAP)
1069                 goto out_unlock;
1070
1071         di->lease_shared_gen = atomic_read(&ceph_inode(dir)->i_shared_gen);
1072         if (duration == 0) {
1073                 __ceph_dentry_dir_lease_touch(di);
1074                 goto out_unlock;
1075         }
1076
1077         if (di->lease_gen == session->s_cap_gen &&
1078             time_before(ttl, di->time))
1079                 goto out_unlock;  /* we already have a newer lease. */
1080
1081         if (di->lease_session && di->lease_session != session) {
1082                 old_lease_session = di->lease_session;
1083                 di->lease_session = NULL;
1084         }
1085
1086         if (!di->lease_session)
1087                 di->lease_session = ceph_get_mds_session(session);
1088         di->lease_gen = session->s_cap_gen;
1089         di->lease_seq = le32_to_cpu(lease->seq);
1090         di->lease_renew_after = half_ttl;
1091         di->lease_renew_from = 0;
1092         di->time = ttl;
1093
1094         __ceph_dentry_lease_touch(di);
1095 out_unlock:
1096         spin_unlock(&dentry->d_lock);
1097         if (old_lease_session)
1098                 ceph_put_mds_session(old_lease_session);
1099 }
1100
1101 /*
1102  * splice a dentry to an inode.
1103  * caller must hold directory i_mutex for this to be safe.
1104  */
1105 static int splice_dentry(struct dentry **pdn, struct inode *in)
1106 {
1107         struct dentry *dn = *pdn;
1108         struct dentry *realdn;
1109
1110         BUG_ON(d_inode(dn));
1111
1112         if (S_ISDIR(in->i_mode)) {
1113                 /* If inode is directory, d_splice_alias() below will remove
1114                  * 'realdn' from its origin parent. We need to ensure that
1115                  * origin parent's readdir cache will not reference 'realdn'
1116                  */
1117                 realdn = d_find_any_alias(in);
1118                 if (realdn) {
1119                         struct ceph_dentry_info *di = ceph_dentry(realdn);
1120                         spin_lock(&realdn->d_lock);
1121
1122                         realdn->d_op->d_prune(realdn);
1123
1124                         di->time = jiffies;
1125                         di->lease_shared_gen = 0;
1126                         di->offset = 0;
1127
1128                         spin_unlock(&realdn->d_lock);
1129                         dput(realdn);
1130                 }
1131         }
1132
1133         /* dn must be unhashed */
1134         if (!d_unhashed(dn))
1135                 d_drop(dn);
1136         realdn = d_splice_alias(in, dn);
1137         if (IS_ERR(realdn)) {
1138                 pr_err("splice_dentry error %ld %p inode %p ino %llx.%llx\n",
1139                        PTR_ERR(realdn), dn, in, ceph_vinop(in));
1140                 return PTR_ERR(realdn);
1141         }
1142
1143         if (realdn) {
1144                 dout("dn %p (%d) spliced with %p (%d) "
1145                      "inode %p ino %llx.%llx\n",
1146                      dn, d_count(dn),
1147                      realdn, d_count(realdn),
1148                      d_inode(realdn), ceph_vinop(d_inode(realdn)));
1149                 dput(dn);
1150                 *pdn = realdn;
1151         } else {
1152                 BUG_ON(!ceph_dentry(dn));
1153                 dout("dn %p attached to %p ino %llx.%llx\n",
1154                      dn, d_inode(dn), ceph_vinop(d_inode(dn)));
1155         }
1156         return 0;
1157 }
1158
1159 static int d_name_cmp(struct dentry *dentry, const char *name, size_t len)
1160 {
1161         int ret;
1162
1163         /* take d_lock to ensure dentry->d_name stability */
1164         spin_lock(&dentry->d_lock);
1165         ret = dentry->d_name.len - len;
1166         if (!ret)
1167                 ret = memcmp(dentry->d_name.name, name, len);
1168         spin_unlock(&dentry->d_lock);
1169         return ret;
1170 }
1171
1172 /*
1173  * Incorporate results into the local cache.  This is either just
1174  * one inode, or a directory, dentry, and possibly linked-to inode (e.g.,
1175  * after a lookup).
1176  *
1177  * A reply may contain
1178  *         a directory inode along with a dentry.
1179  *  and/or a target inode
1180  *
1181  * Called with snap_rwsem (read).
1182  */
1183 int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req)
1184 {
1185         struct ceph_mds_session *session = req->r_session;
1186         struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1187         struct inode *in = NULL;
1188         struct ceph_vino tvino, dvino;
1189         struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
1190         int err = 0;
1191
1192         dout("fill_trace %p is_dentry %d is_target %d\n", req,
1193              rinfo->head->is_dentry, rinfo->head->is_target);
1194
1195         if (!rinfo->head->is_target && !rinfo->head->is_dentry) {
1196                 dout("fill_trace reply is empty!\n");
1197                 if (rinfo->head->result == 0 && req->r_parent)
1198                         ceph_invalidate_dir_request(req);
1199                 return 0;
1200         }
1201
1202         if (rinfo->head->is_dentry) {
1203                 struct inode *dir = req->r_parent;
1204
1205                 if (dir) {
1206                         err = fill_inode(dir, NULL,
1207                                          &rinfo->diri, rinfo->dirfrag,
1208                                          session, req->r_request_started, -1,
1209                                          &req->r_caps_reservation);
1210                         if (err < 0)
1211                                 goto done;
1212                 } else {
1213                         WARN_ON_ONCE(1);
1214                 }
1215
1216                 if (dir && req->r_op == CEPH_MDS_OP_LOOKUPNAME &&
1217                     test_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags) &&
1218                     !test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
1219                         struct qstr dname;
1220                         struct dentry *dn, *parent;
1221
1222                         BUG_ON(!rinfo->head->is_target);
1223                         BUG_ON(req->r_dentry);
1224
1225                         parent = d_find_any_alias(dir);
1226                         BUG_ON(!parent);
1227
1228                         dname.name = rinfo->dname;
1229                         dname.len = rinfo->dname_len;
1230                         dname.hash = full_name_hash(parent, dname.name, dname.len);
1231                         tvino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1232                         tvino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1233 retry_lookup:
1234                         dn = d_lookup(parent, &dname);
1235                         dout("d_lookup on parent=%p name=%.*s got %p\n",
1236                              parent, dname.len, dname.name, dn);
1237
1238                         if (!dn) {
1239                                 dn = d_alloc(parent, &dname);
1240                                 dout("d_alloc %p '%.*s' = %p\n", parent,
1241                                      dname.len, dname.name, dn);
1242                                 if (!dn) {
1243                                         dput(parent);
1244                                         err = -ENOMEM;
1245                                         goto done;
1246                                 }
1247                                 err = 0;
1248                         } else if (d_really_is_positive(dn) &&
1249                                    (ceph_ino(d_inode(dn)) != tvino.ino ||
1250                                     ceph_snap(d_inode(dn)) != tvino.snap)) {
1251                                 dout(" dn %p points to wrong inode %p\n",
1252                                      dn, d_inode(dn));
1253                                 ceph_dir_clear_ordered(dir);
1254                                 d_delete(dn);
1255                                 dput(dn);
1256                                 goto retry_lookup;
1257                         }
1258
1259                         req->r_dentry = dn;
1260                         dput(parent);
1261                 }
1262         }
1263
1264         if (rinfo->head->is_target) {
1265                 tvino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1266                 tvino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1267
1268                 in = ceph_get_inode(sb, tvino);
1269                 if (IS_ERR(in)) {
1270                         err = PTR_ERR(in);
1271                         goto done;
1272                 }
1273                 req->r_target_inode = in;
1274
1275                 err = fill_inode(in, req->r_locked_page, &rinfo->targeti, NULL,
1276                                 session, req->r_request_started,
1277                                 (!test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags) &&
1278                                 rinfo->head->result == 0) ?  req->r_fmode : -1,
1279                                 &req->r_caps_reservation);
1280                 if (err < 0) {
1281                         pr_err("fill_inode badness %p %llx.%llx\n",
1282                                 in, ceph_vinop(in));
1283                         goto done;
1284                 }
1285         }
1286
1287         /*
1288          * ignore null lease/binding on snapdir ENOENT, or else we
1289          * will have trouble splicing in the virtual snapdir later
1290          */
1291         if (rinfo->head->is_dentry &&
1292             !test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags) &&
1293             test_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags) &&
1294             (rinfo->head->is_target || strncmp(req->r_dentry->d_name.name,
1295                                                fsc->mount_options->snapdir_name,
1296                                                req->r_dentry->d_name.len))) {
1297                 /*
1298                  * lookup link rename   : null -> possibly existing inode
1299                  * mknod symlink mkdir  : null -> new inode
1300                  * unlink               : linked -> null
1301                  */
1302                 struct inode *dir = req->r_parent;
1303                 struct dentry *dn = req->r_dentry;
1304                 bool have_dir_cap, have_lease;
1305
1306                 BUG_ON(!dn);
1307                 BUG_ON(!dir);
1308                 BUG_ON(d_inode(dn->d_parent) != dir);
1309
1310                 dvino.ino = le64_to_cpu(rinfo->diri.in->ino);
1311                 dvino.snap = le64_to_cpu(rinfo->diri.in->snapid);
1312
1313                 BUG_ON(ceph_ino(dir) != dvino.ino);
1314                 BUG_ON(ceph_snap(dir) != dvino.snap);
1315
1316                 /* do we have a lease on the whole dir? */
1317                 have_dir_cap =
1318                         (le32_to_cpu(rinfo->diri.in->cap.caps) &
1319                          CEPH_CAP_FILE_SHARED);
1320
1321                 /* do we have a dn lease? */
1322                 have_lease = have_dir_cap ||
1323                         le32_to_cpu(rinfo->dlease->duration_ms);
1324                 if (!have_lease)
1325                         dout("fill_trace  no dentry lease or dir cap\n");
1326
1327                 /* rename? */
1328                 if (req->r_old_dentry && req->r_op == CEPH_MDS_OP_RENAME) {
1329                         struct inode *olddir = req->r_old_dentry_dir;
1330                         BUG_ON(!olddir);
1331
1332                         dout(" src %p '%pd' dst %p '%pd'\n",
1333                              req->r_old_dentry,
1334                              req->r_old_dentry,
1335                              dn, dn);
1336                         dout("fill_trace doing d_move %p -> %p\n",
1337                              req->r_old_dentry, dn);
1338
1339                         /* d_move screws up sibling dentries' offsets */
1340                         ceph_dir_clear_ordered(dir);
1341                         ceph_dir_clear_ordered(olddir);
1342
1343                         d_move(req->r_old_dentry, dn);
1344                         dout(" src %p '%pd' dst %p '%pd'\n",
1345                              req->r_old_dentry,
1346                              req->r_old_dentry,
1347                              dn, dn);
1348
1349                         /* ensure target dentry is invalidated, despite
1350                            rehashing bug in vfs_rename_dir */
1351                         ceph_invalidate_dentry_lease(dn);
1352
1353                         dout("dn %p gets new offset %lld\n", req->r_old_dentry,
1354                              ceph_dentry(req->r_old_dentry)->offset);
1355
1356                         /* swap r_dentry and r_old_dentry in case that
1357                          * splice_dentry() gets called later. This is safe
1358                          * because no other place will use them */
1359                         req->r_dentry = req->r_old_dentry;
1360                         req->r_old_dentry = dn;
1361                         dn = req->r_dentry;
1362                 }
1363
1364                 /* null dentry? */
1365                 if (!rinfo->head->is_target) {
1366                         dout("fill_trace null dentry\n");
1367                         if (d_really_is_positive(dn)) {
1368                                 dout("d_delete %p\n", dn);
1369                                 ceph_dir_clear_ordered(dir);
1370                                 d_delete(dn);
1371                         } else if (have_lease) {
1372                                 if (d_unhashed(dn))
1373                                         d_add(dn, NULL);
1374                                 update_dentry_lease(dn, rinfo->dlease,
1375                                                     session,
1376                                                     req->r_request_started,
1377                                                     NULL, &dvino);
1378                         }
1379                         goto done;
1380                 }
1381
1382                 /* attach proper inode */
1383                 if (d_really_is_negative(dn)) {
1384                         ceph_dir_clear_ordered(dir);
1385                         ihold(in);
1386                         err = splice_dentry(&req->r_dentry, in);
1387                         if (err < 0)
1388                                 goto done;
1389                         dn = req->r_dentry;  /* may have spliced */
1390                 } else if (d_really_is_positive(dn) && d_inode(dn) != in) {
1391                         dout(" %p links to %p %llx.%llx, not %llx.%llx\n",
1392                              dn, d_inode(dn), ceph_vinop(d_inode(dn)),
1393                              ceph_vinop(in));
1394                         d_invalidate(dn);
1395                         have_lease = false;
1396                 }
1397
1398                 if (have_lease) {
1399                         tvino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1400                         tvino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1401                         update_dentry_lease(dn, rinfo->dlease, session,
1402                                             req->r_request_started,
1403                                             &tvino, &dvino);
1404                 }
1405                 dout(" final dn %p\n", dn);
1406         } else if ((req->r_op == CEPH_MDS_OP_LOOKUPSNAP ||
1407                     req->r_op == CEPH_MDS_OP_MKSNAP) &&
1408                    !test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
1409                 struct inode *dir = req->r_parent;
1410
1411                 /* fill out a snapdir LOOKUPSNAP dentry */
1412                 BUG_ON(!dir);
1413                 BUG_ON(ceph_snap(dir) != CEPH_SNAPDIR);
1414                 BUG_ON(!req->r_dentry);
1415                 dout(" linking snapped dir %p to dn %p\n", in, req->r_dentry);
1416                 ceph_dir_clear_ordered(dir);
1417                 ihold(in);
1418                 err = splice_dentry(&req->r_dentry, in);
1419                 if (err < 0)
1420                         goto done;
1421         } else if (rinfo->head->is_dentry &&
1422                    !d_name_cmp(req->r_dentry, rinfo->dname, rinfo->dname_len)) {
1423                 struct ceph_vino *ptvino = NULL;
1424
1425                 if ((le32_to_cpu(rinfo->diri.in->cap.caps) & CEPH_CAP_FILE_SHARED) ||
1426                     le32_to_cpu(rinfo->dlease->duration_ms)) {
1427                         dvino.ino = le64_to_cpu(rinfo->diri.in->ino);
1428                         dvino.snap = le64_to_cpu(rinfo->diri.in->snapid);
1429
1430                         if (rinfo->head->is_target) {
1431                                 tvino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1432                                 tvino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1433                                 ptvino = &tvino;
1434                         }
1435
1436                         update_dentry_lease(req->r_dentry, rinfo->dlease,
1437                                 session, req->r_request_started, ptvino,
1438                                 &dvino);
1439                 } else {
1440                         dout("%s: no dentry lease or dir cap\n", __func__);
1441                 }
1442         }
1443 done:
1444         dout("fill_trace done err=%d\n", err);
1445         return err;
1446 }
1447
1448 /*
1449  * Prepopulate our cache with readdir results, leases, etc.
1450  */
1451 static int readdir_prepopulate_inodes_only(struct ceph_mds_request *req,
1452                                            struct ceph_mds_session *session)
1453 {
1454         struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1455         int i, err = 0;
1456
1457         for (i = 0; i < rinfo->dir_nr; i++) {
1458                 struct ceph_mds_reply_dir_entry *rde = rinfo->dir_entries + i;
1459                 struct ceph_vino vino;
1460                 struct inode *in;
1461                 int rc;
1462
1463                 vino.ino = le64_to_cpu(rde->inode.in->ino);
1464                 vino.snap = le64_to_cpu(rde->inode.in->snapid);
1465
1466                 in = ceph_get_inode(req->r_dentry->d_sb, vino);
1467                 if (IS_ERR(in)) {
1468                         err = PTR_ERR(in);
1469                         dout("new_inode badness got %d\n", err);
1470                         continue;
1471                 }
1472                 rc = fill_inode(in, NULL, &rde->inode, NULL, session,
1473                                 req->r_request_started, -1,
1474                                 &req->r_caps_reservation);
1475                 if (rc < 0) {
1476                         pr_err("fill_inode badness on %p got %d\n", in, rc);
1477                         err = rc;
1478                 }
1479                 /* avoid calling iput_final() in mds dispatch threads */
1480                 ceph_async_iput(in);
1481         }
1482
1483         return err;
1484 }
1485
1486 void ceph_readdir_cache_release(struct ceph_readdir_cache_control *ctl)
1487 {
1488         if (ctl->page) {
1489                 kunmap(ctl->page);
1490                 put_page(ctl->page);
1491                 ctl->page = NULL;
1492         }
1493 }
1494
1495 static int fill_readdir_cache(struct inode *dir, struct dentry *dn,
1496                               struct ceph_readdir_cache_control *ctl,
1497                               struct ceph_mds_request *req)
1498 {
1499         struct ceph_inode_info *ci = ceph_inode(dir);
1500         unsigned nsize = PAGE_SIZE / sizeof(struct dentry*);
1501         unsigned idx = ctl->index % nsize;
1502         pgoff_t pgoff = ctl->index / nsize;
1503
1504         if (!ctl->page || pgoff != page_index(ctl->page)) {
1505                 ceph_readdir_cache_release(ctl);
1506                 if (idx == 0)
1507                         ctl->page = grab_cache_page(&dir->i_data, pgoff);
1508                 else
1509                         ctl->page = find_lock_page(&dir->i_data, pgoff);
1510                 if (!ctl->page) {
1511                         ctl->index = -1;
1512                         return idx == 0 ? -ENOMEM : 0;
1513                 }
1514                 /* reading/filling the cache are serialized by
1515                  * i_mutex, no need to use page lock */
1516                 unlock_page(ctl->page);
1517                 ctl->dentries = kmap(ctl->page);
1518                 if (idx == 0)
1519                         memset(ctl->dentries, 0, PAGE_SIZE);
1520         }
1521
1522         if (req->r_dir_release_cnt == atomic64_read(&ci->i_release_count) &&
1523             req->r_dir_ordered_cnt == atomic64_read(&ci->i_ordered_count)) {
1524                 dout("readdir cache dn %p idx %d\n", dn, ctl->index);
1525                 ctl->dentries[idx] = dn;
1526                 ctl->index++;
1527         } else {
1528                 dout("disable readdir cache\n");
1529                 ctl->index = -1;
1530         }
1531         return 0;
1532 }
1533
1534 int ceph_readdir_prepopulate(struct ceph_mds_request *req,
1535                              struct ceph_mds_session *session)
1536 {
1537         struct dentry *parent = req->r_dentry;
1538         struct ceph_inode_info *ci = ceph_inode(d_inode(parent));
1539         struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1540         struct qstr dname;
1541         struct dentry *dn;
1542         struct inode *in;
1543         int err = 0, skipped = 0, ret, i;
1544         struct ceph_mds_request_head *rhead = req->r_request->front.iov_base;
1545         u32 frag = le32_to_cpu(rhead->args.readdir.frag);
1546         u32 last_hash = 0;
1547         u32 fpos_offset;
1548         struct ceph_readdir_cache_control cache_ctl = {};
1549
1550         if (test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags))
1551                 return readdir_prepopulate_inodes_only(req, session);
1552
1553         if (rinfo->hash_order) {
1554                 if (req->r_path2) {
1555                         last_hash = ceph_str_hash(ci->i_dir_layout.dl_dir_hash,
1556                                                   req->r_path2,
1557                                                   strlen(req->r_path2));
1558                         last_hash = ceph_frag_value(last_hash);
1559                 } else if (rinfo->offset_hash) {
1560                         /* mds understands offset_hash */
1561                         WARN_ON_ONCE(req->r_readdir_offset != 2);
1562                         last_hash = le32_to_cpu(rhead->args.readdir.offset_hash);
1563                 }
1564         }
1565
1566         if (rinfo->dir_dir &&
1567             le32_to_cpu(rinfo->dir_dir->frag) != frag) {
1568                 dout("readdir_prepopulate got new frag %x -> %x\n",
1569                      frag, le32_to_cpu(rinfo->dir_dir->frag));
1570                 frag = le32_to_cpu(rinfo->dir_dir->frag);
1571                 if (!rinfo->hash_order)
1572                         req->r_readdir_offset = 2;
1573         }
1574
1575         if (le32_to_cpu(rinfo->head->op) == CEPH_MDS_OP_LSSNAP) {
1576                 dout("readdir_prepopulate %d items under SNAPDIR dn %p\n",
1577                      rinfo->dir_nr, parent);
1578         } else {
1579                 dout("readdir_prepopulate %d items under dn %p\n",
1580                      rinfo->dir_nr, parent);
1581                 if (rinfo->dir_dir)
1582                         ceph_fill_dirfrag(d_inode(parent), rinfo->dir_dir);
1583
1584                 if (ceph_frag_is_leftmost(frag) &&
1585                     req->r_readdir_offset == 2 &&
1586                     !(rinfo->hash_order && last_hash)) {
1587                         /* note dir version at start of readdir so we can
1588                          * tell if any dentries get dropped */
1589                         req->r_dir_release_cnt =
1590                                 atomic64_read(&ci->i_release_count);
1591                         req->r_dir_ordered_cnt =
1592                                 atomic64_read(&ci->i_ordered_count);
1593                         req->r_readdir_cache_idx = 0;
1594                 }
1595         }
1596
1597         cache_ctl.index = req->r_readdir_cache_idx;
1598         fpos_offset = req->r_readdir_offset;
1599
1600         /* FIXME: release caps/leases if error occurs */
1601         for (i = 0; i < rinfo->dir_nr; i++) {
1602                 struct ceph_mds_reply_dir_entry *rde = rinfo->dir_entries + i;
1603                 struct ceph_vino tvino, dvino;
1604
1605                 dname.name = rde->name;
1606                 dname.len = rde->name_len;
1607                 dname.hash = full_name_hash(parent, dname.name, dname.len);
1608
1609                 tvino.ino = le64_to_cpu(rde->inode.in->ino);
1610                 tvino.snap = le64_to_cpu(rde->inode.in->snapid);
1611
1612                 if (rinfo->hash_order) {
1613                         u32 hash = ceph_str_hash(ci->i_dir_layout.dl_dir_hash,
1614                                                  rde->name, rde->name_len);
1615                         hash = ceph_frag_value(hash);
1616                         if (hash != last_hash)
1617                                 fpos_offset = 2;
1618                         last_hash = hash;
1619                         rde->offset = ceph_make_fpos(hash, fpos_offset++, true);
1620                 } else {
1621                         rde->offset = ceph_make_fpos(frag, fpos_offset++, false);
1622                 }
1623
1624 retry_lookup:
1625                 dn = d_lookup(parent, &dname);
1626                 dout("d_lookup on parent=%p name=%.*s got %p\n",
1627                      parent, dname.len, dname.name, dn);
1628
1629                 if (!dn) {
1630                         dn = d_alloc(parent, &dname);
1631                         dout("d_alloc %p '%.*s' = %p\n", parent,
1632                              dname.len, dname.name, dn);
1633                         if (!dn) {
1634                                 dout("d_alloc badness\n");
1635                                 err = -ENOMEM;
1636                                 goto out;
1637                         }
1638                 } else if (d_really_is_positive(dn) &&
1639                            (ceph_ino(d_inode(dn)) != tvino.ino ||
1640                             ceph_snap(d_inode(dn)) != tvino.snap)) {
1641                         struct ceph_dentry_info *di = ceph_dentry(dn);
1642                         dout(" dn %p points to wrong inode %p\n",
1643                              dn, d_inode(dn));
1644
1645                         spin_lock(&dn->d_lock);
1646                         if (di->offset > 0 &&
1647                             di->lease_shared_gen ==
1648                             atomic_read(&ci->i_shared_gen)) {
1649                                 __ceph_dir_clear_ordered(ci);
1650                                 di->offset = 0;
1651                         }
1652                         spin_unlock(&dn->d_lock);
1653
1654                         d_delete(dn);
1655                         dput(dn);
1656                         goto retry_lookup;
1657                 }
1658
1659                 /* inode */
1660                 if (d_really_is_positive(dn)) {
1661                         in = d_inode(dn);
1662                 } else {
1663                         in = ceph_get_inode(parent->d_sb, tvino);
1664                         if (IS_ERR(in)) {
1665                                 dout("new_inode badness\n");
1666                                 d_drop(dn);
1667                                 dput(dn);
1668                                 err = PTR_ERR(in);
1669                                 goto out;
1670                         }
1671                 }
1672
1673                 ret = fill_inode(in, NULL, &rde->inode, NULL, session,
1674                                  req->r_request_started, -1,
1675                                  &req->r_caps_reservation);
1676                 if (ret < 0) {
1677                         pr_err("fill_inode badness on %p\n", in);
1678                         if (d_really_is_negative(dn)) {
1679                                 /* avoid calling iput_final() in mds
1680                                  * dispatch threads */
1681                                 ceph_async_iput(in);
1682                         }
1683                         d_drop(dn);
1684                         err = ret;
1685                         goto next_item;
1686                 }
1687
1688                 if (d_really_is_negative(dn)) {
1689                         if (ceph_security_xattr_deadlock(in)) {
1690                                 dout(" skip splicing dn %p to inode %p"
1691                                      " (security xattr deadlock)\n", dn, in);
1692                                 ceph_async_iput(in);
1693                                 skipped++;
1694                                 goto next_item;
1695                         }
1696
1697                         err = splice_dentry(&dn, in);
1698                         if (err < 0)
1699                                 goto next_item;
1700                 }
1701
1702                 ceph_dentry(dn)->offset = rde->offset;
1703
1704                 dvino = ceph_vino(d_inode(parent));
1705                 update_dentry_lease(dn, rde->lease, req->r_session,
1706                                     req->r_request_started, &tvino, &dvino);
1707
1708                 if (err == 0 && skipped == 0 && cache_ctl.index >= 0) {
1709                         ret = fill_readdir_cache(d_inode(parent), dn,
1710                                                  &cache_ctl, req);
1711                         if (ret < 0)
1712                                 err = ret;
1713                 }
1714 next_item:
1715                 dput(dn);
1716         }
1717 out:
1718         if (err == 0 && skipped == 0) {
1719                 set_bit(CEPH_MDS_R_DID_PREPOPULATE, &req->r_req_flags);
1720                 req->r_readdir_cache_idx = cache_ctl.index;
1721         }
1722         ceph_readdir_cache_release(&cache_ctl);
1723         dout("readdir_prepopulate done\n");
1724         return err;
1725 }
1726
1727 bool ceph_inode_set_size(struct inode *inode, loff_t size)
1728 {
1729         struct ceph_inode_info *ci = ceph_inode(inode);
1730         bool ret;
1731
1732         spin_lock(&ci->i_ceph_lock);
1733         dout("set_size %p %llu -> %llu\n", inode, inode->i_size, size);
1734         i_size_write(inode, size);
1735         inode->i_blocks = calc_inode_blocks(size);
1736
1737         ret = __ceph_should_report_size(ci);
1738
1739         spin_unlock(&ci->i_ceph_lock);
1740         return ret;
1741 }
1742
1743 /*
1744  * Put reference to inode, but avoid calling iput_final() in current thread.
1745  * iput_final() may wait for reahahead pages. The wait can cause deadlock in
1746  * some contexts.
1747  */
1748 void ceph_async_iput(struct inode *inode)
1749 {
1750         if (!inode)
1751                 return;
1752         for (;;) {
1753                 if (atomic_add_unless(&inode->i_count, -1, 1))
1754                         break;
1755                 if (queue_work(ceph_inode_to_client(inode)->inode_wq,
1756                                &ceph_inode(inode)->i_work))
1757                         break;
1758                 /* queue work failed, i_count must be at least 2 */
1759         }
1760 }
1761
1762 /*
1763  * Write back inode data in a worker thread.  (This can't be done
1764  * in the message handler context.)
1765  */
1766 void ceph_queue_writeback(struct inode *inode)
1767 {
1768         struct ceph_inode_info *ci = ceph_inode(inode);
1769         set_bit(CEPH_I_WORK_WRITEBACK, &ci->i_work_mask);
1770
1771         ihold(inode);
1772         if (queue_work(ceph_inode_to_client(inode)->inode_wq,
1773                        &ci->i_work)) {
1774                 dout("ceph_queue_writeback %p\n", inode);
1775         } else {
1776                 dout("ceph_queue_writeback %p already queued, mask=%lx\n",
1777                      inode, ci->i_work_mask);
1778                 iput(inode);
1779         }
1780 }
1781
1782 /*
1783  * queue an async invalidation
1784  */
1785 void ceph_queue_invalidate(struct inode *inode)
1786 {
1787         struct ceph_inode_info *ci = ceph_inode(inode);
1788         set_bit(CEPH_I_WORK_INVALIDATE_PAGES, &ci->i_work_mask);
1789
1790         ihold(inode);
1791         if (queue_work(ceph_inode_to_client(inode)->inode_wq,
1792                        &ceph_inode(inode)->i_work)) {
1793                 dout("ceph_queue_invalidate %p\n", inode);
1794         } else {
1795                 dout("ceph_queue_invalidate %p already queued, mask=%lx\n",
1796                      inode, ci->i_work_mask);
1797                 iput(inode);
1798         }
1799 }
1800
1801 /*
1802  * Queue an async vmtruncate.  If we fail to queue work, we will handle
1803  * the truncation the next time we call __ceph_do_pending_vmtruncate.
1804  */
1805 void ceph_queue_vmtruncate(struct inode *inode)
1806 {
1807         struct ceph_inode_info *ci = ceph_inode(inode);
1808         set_bit(CEPH_I_WORK_VMTRUNCATE, &ci->i_work_mask);
1809
1810         ihold(inode);
1811         if (queue_work(ceph_inode_to_client(inode)->inode_wq,
1812                        &ci->i_work)) {
1813                 dout("ceph_queue_vmtruncate %p\n", inode);
1814         } else {
1815                 dout("ceph_queue_vmtruncate %p already queued, mask=%lx\n",
1816                      inode, ci->i_work_mask);
1817                 iput(inode);
1818         }
1819 }
1820
1821 static void ceph_do_invalidate_pages(struct inode *inode)
1822 {
1823         struct ceph_inode_info *ci = ceph_inode(inode);
1824         struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1825         u32 orig_gen;
1826         int check = 0;
1827
1828         mutex_lock(&ci->i_truncate_mutex);
1829
1830         if (READ_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) {
1831                 pr_warn_ratelimited("invalidate_pages %p %lld forced umount\n",
1832                                     inode, ceph_ino(inode));
1833                 mapping_set_error(inode->i_mapping, -EIO);
1834                 truncate_pagecache(inode, 0);
1835                 mutex_unlock(&ci->i_truncate_mutex);
1836                 goto out;
1837         }
1838
1839         spin_lock(&ci->i_ceph_lock);
1840         dout("invalidate_pages %p gen %d revoking %d\n", inode,
1841              ci->i_rdcache_gen, ci->i_rdcache_revoking);
1842         if (ci->i_rdcache_revoking != ci->i_rdcache_gen) {
1843                 if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE))
1844                         check = 1;
1845                 spin_unlock(&ci->i_ceph_lock);
1846                 mutex_unlock(&ci->i_truncate_mutex);
1847                 goto out;
1848         }
1849         orig_gen = ci->i_rdcache_gen;
1850         spin_unlock(&ci->i_ceph_lock);
1851
1852         if (invalidate_inode_pages2(inode->i_mapping) < 0) {
1853                 pr_err("invalidate_pages %p fails\n", inode);
1854         }
1855
1856         spin_lock(&ci->i_ceph_lock);
1857         if (orig_gen == ci->i_rdcache_gen &&
1858             orig_gen == ci->i_rdcache_revoking) {
1859                 dout("invalidate_pages %p gen %d successful\n", inode,
1860                      ci->i_rdcache_gen);
1861                 ci->i_rdcache_revoking--;
1862                 check = 1;
1863         } else {
1864                 dout("invalidate_pages %p gen %d raced, now %d revoking %d\n",
1865                      inode, orig_gen, ci->i_rdcache_gen,
1866                      ci->i_rdcache_revoking);
1867                 if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE))
1868                         check = 1;
1869         }
1870         spin_unlock(&ci->i_ceph_lock);
1871         mutex_unlock(&ci->i_truncate_mutex);
1872 out:
1873         if (check)
1874                 ceph_check_caps(ci, 0, NULL);
1875 }
1876
1877 /*
1878  * Make sure any pending truncation is applied before doing anything
1879  * that may depend on it.
1880  */
1881 void __ceph_do_pending_vmtruncate(struct inode *inode)
1882 {
1883         struct ceph_inode_info *ci = ceph_inode(inode);
1884         u64 to;
1885         int wrbuffer_refs, finish = 0;
1886
1887         mutex_lock(&ci->i_truncate_mutex);
1888 retry:
1889         spin_lock(&ci->i_ceph_lock);
1890         if (ci->i_truncate_pending == 0) {
1891                 dout("__do_pending_vmtruncate %p none pending\n", inode);
1892                 spin_unlock(&ci->i_ceph_lock);
1893                 mutex_unlock(&ci->i_truncate_mutex);
1894                 return;
1895         }
1896
1897         /*
1898          * make sure any dirty snapped pages are flushed before we
1899          * possibly truncate them.. so write AND block!
1900          */
1901         if (ci->i_wrbuffer_ref_head < ci->i_wrbuffer_ref) {
1902                 spin_unlock(&ci->i_ceph_lock);
1903                 dout("__do_pending_vmtruncate %p flushing snaps first\n",
1904                      inode);
1905                 filemap_write_and_wait_range(&inode->i_data, 0,
1906                                              inode->i_sb->s_maxbytes);
1907                 goto retry;
1908         }
1909
1910         /* there should be no reader or writer */
1911         WARN_ON_ONCE(ci->i_rd_ref || ci->i_wr_ref);
1912
1913         to = ci->i_truncate_size;
1914         wrbuffer_refs = ci->i_wrbuffer_ref;
1915         dout("__do_pending_vmtruncate %p (%d) to %lld\n", inode,
1916              ci->i_truncate_pending, to);
1917         spin_unlock(&ci->i_ceph_lock);
1918
1919         truncate_pagecache(inode, to);
1920
1921         spin_lock(&ci->i_ceph_lock);
1922         if (to == ci->i_truncate_size) {
1923                 ci->i_truncate_pending = 0;
1924                 finish = 1;
1925         }
1926         spin_unlock(&ci->i_ceph_lock);
1927         if (!finish)
1928                 goto retry;
1929
1930         mutex_unlock(&ci->i_truncate_mutex);
1931
1932         if (wrbuffer_refs == 0)
1933                 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
1934
1935         wake_up_all(&ci->i_cap_wq);
1936 }
1937
1938 static void ceph_inode_work(struct work_struct *work)
1939 {
1940         struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1941                                                  i_work);
1942         struct inode *inode = &ci->vfs_inode;
1943
1944         if (test_and_clear_bit(CEPH_I_WORK_WRITEBACK, &ci->i_work_mask)) {
1945                 dout("writeback %p\n", inode);
1946                 filemap_fdatawrite(&inode->i_data);
1947         }
1948         if (test_and_clear_bit(CEPH_I_WORK_INVALIDATE_PAGES, &ci->i_work_mask))
1949                 ceph_do_invalidate_pages(inode);
1950
1951         if (test_and_clear_bit(CEPH_I_WORK_VMTRUNCATE, &ci->i_work_mask))
1952                 __ceph_do_pending_vmtruncate(inode);
1953
1954         iput(inode);
1955 }
1956
1957 /*
1958  * symlinks
1959  */
1960 static const struct inode_operations ceph_symlink_iops = {
1961         .get_link = simple_get_link,
1962         .setattr = ceph_setattr,
1963         .getattr = ceph_getattr,
1964         .listxattr = ceph_listxattr,
1965 };
1966
1967 int __ceph_setattr(struct inode *inode, struct iattr *attr)
1968 {
1969         struct ceph_inode_info *ci = ceph_inode(inode);
1970         const unsigned int ia_valid = attr->ia_valid;
1971         struct ceph_mds_request *req;
1972         struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
1973         struct ceph_cap_flush *prealloc_cf;
1974         int issued;
1975         int release = 0, dirtied = 0;
1976         int mask = 0;
1977         int err = 0;
1978         int inode_dirty_flags = 0;
1979         bool lock_snap_rwsem = false;
1980
1981         prealloc_cf = ceph_alloc_cap_flush();
1982         if (!prealloc_cf)
1983                 return -ENOMEM;
1984
1985         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETATTR,
1986                                        USE_AUTH_MDS);
1987         if (IS_ERR(req)) {
1988                 ceph_free_cap_flush(prealloc_cf);
1989                 return PTR_ERR(req);
1990         }
1991
1992         spin_lock(&ci->i_ceph_lock);
1993         issued = __ceph_caps_issued(ci, NULL);
1994
1995         if (!ci->i_head_snapc &&
1996             (issued & (CEPH_CAP_ANY_EXCL | CEPH_CAP_FILE_WR))) {
1997                 lock_snap_rwsem = true;
1998                 if (!down_read_trylock(&mdsc->snap_rwsem)) {
1999                         spin_unlock(&ci->i_ceph_lock);
2000                         down_read(&mdsc->snap_rwsem);
2001                         spin_lock(&ci->i_ceph_lock);
2002                         issued = __ceph_caps_issued(ci, NULL);
2003                 }
2004         }
2005
2006         dout("setattr %p issued %s\n", inode, ceph_cap_string(issued));
2007
2008         if (ia_valid & ATTR_UID) {
2009                 dout("setattr %p uid %d -> %d\n", inode,
2010                      from_kuid(&init_user_ns, inode->i_uid),
2011                      from_kuid(&init_user_ns, attr->ia_uid));
2012                 if (issued & CEPH_CAP_AUTH_EXCL) {
2013                         inode->i_uid = attr->ia_uid;
2014                         dirtied |= CEPH_CAP_AUTH_EXCL;
2015                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
2016                            !uid_eq(attr->ia_uid, inode->i_uid)) {
2017                         req->r_args.setattr.uid = cpu_to_le32(
2018                                 from_kuid(&init_user_ns, attr->ia_uid));
2019                         mask |= CEPH_SETATTR_UID;
2020                         release |= CEPH_CAP_AUTH_SHARED;
2021                 }
2022         }
2023         if (ia_valid & ATTR_GID) {
2024                 dout("setattr %p gid %d -> %d\n", inode,
2025                      from_kgid(&init_user_ns, inode->i_gid),
2026                      from_kgid(&init_user_ns, attr->ia_gid));
2027                 if (issued & CEPH_CAP_AUTH_EXCL) {
2028                         inode->i_gid = attr->ia_gid;
2029                         dirtied |= CEPH_CAP_AUTH_EXCL;
2030                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
2031                            !gid_eq(attr->ia_gid, inode->i_gid)) {
2032                         req->r_args.setattr.gid = cpu_to_le32(
2033                                 from_kgid(&init_user_ns, attr->ia_gid));
2034                         mask |= CEPH_SETATTR_GID;
2035                         release |= CEPH_CAP_AUTH_SHARED;
2036                 }
2037         }
2038         if (ia_valid & ATTR_MODE) {
2039                 dout("setattr %p mode 0%o -> 0%o\n", inode, inode->i_mode,
2040                      attr->ia_mode);
2041                 if (issued & CEPH_CAP_AUTH_EXCL) {
2042                         inode->i_mode = attr->ia_mode;
2043                         dirtied |= CEPH_CAP_AUTH_EXCL;
2044                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
2045                            attr->ia_mode != inode->i_mode) {
2046                         inode->i_mode = attr->ia_mode;
2047                         req->r_args.setattr.mode = cpu_to_le32(attr->ia_mode);
2048                         mask |= CEPH_SETATTR_MODE;
2049                         release |= CEPH_CAP_AUTH_SHARED;
2050                 }
2051         }
2052
2053         if (ia_valid & ATTR_ATIME) {
2054                 dout("setattr %p atime %lld.%ld -> %lld.%ld\n", inode,
2055                      inode->i_atime.tv_sec, inode->i_atime.tv_nsec,
2056                      attr->ia_atime.tv_sec, attr->ia_atime.tv_nsec);
2057                 if (issued & CEPH_CAP_FILE_EXCL) {
2058                         ci->i_time_warp_seq++;
2059                         inode->i_atime = attr->ia_atime;
2060                         dirtied |= CEPH_CAP_FILE_EXCL;
2061                 } else if ((issued & CEPH_CAP_FILE_WR) &&
2062                            timespec64_compare(&inode->i_atime,
2063                                             &attr->ia_atime) < 0) {
2064                         inode->i_atime = attr->ia_atime;
2065                         dirtied |= CEPH_CAP_FILE_WR;
2066                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
2067                            !timespec64_equal(&inode->i_atime, &attr->ia_atime)) {
2068                         ceph_encode_timespec64(&req->r_args.setattr.atime,
2069                                                &attr->ia_atime);
2070                         mask |= CEPH_SETATTR_ATIME;
2071                         release |= CEPH_CAP_FILE_SHARED |
2072                                    CEPH_CAP_FILE_RD | CEPH_CAP_FILE_WR;
2073                 }
2074         }
2075         if (ia_valid & ATTR_MTIME) {
2076                 dout("setattr %p mtime %lld.%ld -> %lld.%ld\n", inode,
2077                      inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
2078                      attr->ia_mtime.tv_sec, attr->ia_mtime.tv_nsec);
2079                 if (issued & CEPH_CAP_FILE_EXCL) {
2080                         ci->i_time_warp_seq++;
2081                         inode->i_mtime = attr->ia_mtime;
2082                         dirtied |= CEPH_CAP_FILE_EXCL;
2083                 } else if ((issued & CEPH_CAP_FILE_WR) &&
2084                            timespec64_compare(&inode->i_mtime,
2085                                             &attr->ia_mtime) < 0) {
2086                         inode->i_mtime = attr->ia_mtime;
2087                         dirtied |= CEPH_CAP_FILE_WR;
2088                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
2089                            !timespec64_equal(&inode->i_mtime, &attr->ia_mtime)) {
2090                         ceph_encode_timespec64(&req->r_args.setattr.mtime,
2091                                                &attr->ia_mtime);
2092                         mask |= CEPH_SETATTR_MTIME;
2093                         release |= CEPH_CAP_FILE_SHARED |
2094                                    CEPH_CAP_FILE_RD | CEPH_CAP_FILE_WR;
2095                 }
2096         }
2097         if (ia_valid & ATTR_SIZE) {
2098                 dout("setattr %p size %lld -> %lld\n", inode,
2099                      inode->i_size, attr->ia_size);
2100                 if ((issued & CEPH_CAP_FILE_EXCL) &&
2101                     attr->ia_size > inode->i_size) {
2102                         i_size_write(inode, attr->ia_size);
2103                         inode->i_blocks = calc_inode_blocks(attr->ia_size);
2104                         ci->i_reported_size = attr->ia_size;
2105                         dirtied |= CEPH_CAP_FILE_EXCL;
2106                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
2107                            attr->ia_size != inode->i_size) {
2108                         req->r_args.setattr.size = cpu_to_le64(attr->ia_size);
2109                         req->r_args.setattr.old_size =
2110                                 cpu_to_le64(inode->i_size);
2111                         mask |= CEPH_SETATTR_SIZE;
2112                         release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_EXCL |
2113                                    CEPH_CAP_FILE_RD | CEPH_CAP_FILE_WR;
2114                 }
2115         }
2116
2117         /* these do nothing */
2118         if (ia_valid & ATTR_CTIME) {
2119                 bool only = (ia_valid & (ATTR_SIZE|ATTR_MTIME|ATTR_ATIME|
2120                                          ATTR_MODE|ATTR_UID|ATTR_GID)) == 0;
2121                 dout("setattr %p ctime %lld.%ld -> %lld.%ld (%s)\n", inode,
2122                      inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
2123                      attr->ia_ctime.tv_sec, attr->ia_ctime.tv_nsec,
2124                      only ? "ctime only" : "ignored");
2125                 if (only) {
2126                         /*
2127                          * if kernel wants to dirty ctime but nothing else,
2128                          * we need to choose a cap to dirty under, or do
2129                          * a almost-no-op setattr
2130                          */
2131                         if (issued & CEPH_CAP_AUTH_EXCL)
2132                                 dirtied |= CEPH_CAP_AUTH_EXCL;
2133                         else if (issued & CEPH_CAP_FILE_EXCL)
2134                                 dirtied |= CEPH_CAP_FILE_EXCL;
2135                         else if (issued & CEPH_CAP_XATTR_EXCL)
2136                                 dirtied |= CEPH_CAP_XATTR_EXCL;
2137                         else
2138                                 mask |= CEPH_SETATTR_CTIME;
2139                 }
2140         }
2141         if (ia_valid & ATTR_FILE)
2142                 dout("setattr %p ATTR_FILE ... hrm!\n", inode);
2143
2144         if (dirtied) {
2145                 inode_dirty_flags = __ceph_mark_dirty_caps(ci, dirtied,
2146                                                            &prealloc_cf);
2147                 inode->i_ctime = attr->ia_ctime;
2148         }
2149
2150         release &= issued;
2151         spin_unlock(&ci->i_ceph_lock);
2152         if (lock_snap_rwsem)
2153                 up_read(&mdsc->snap_rwsem);
2154
2155         if (inode_dirty_flags)
2156                 __mark_inode_dirty(inode, inode_dirty_flags);
2157
2158
2159         if (mask) {
2160                 req->r_inode = inode;
2161                 ihold(inode);
2162                 req->r_inode_drop = release;
2163                 req->r_args.setattr.mask = cpu_to_le32(mask);
2164                 req->r_num_caps = 1;
2165                 req->r_stamp = attr->ia_ctime;
2166                 err = ceph_mdsc_do_request(mdsc, NULL, req);
2167         }
2168         dout("setattr %p result=%d (%s locally, %d remote)\n", inode, err,
2169              ceph_cap_string(dirtied), mask);
2170
2171         ceph_mdsc_put_request(req);
2172         ceph_free_cap_flush(prealloc_cf);
2173
2174         if (err >= 0 && (mask & CEPH_SETATTR_SIZE))
2175                 __ceph_do_pending_vmtruncate(inode);
2176
2177         return err;
2178 }
2179
2180 /*
2181  * setattr
2182  */
2183 int ceph_setattr(struct dentry *dentry, struct iattr *attr)
2184 {
2185         struct inode *inode = d_inode(dentry);
2186         struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
2187         int err;
2188
2189         if (ceph_snap(inode) != CEPH_NOSNAP)
2190                 return -EROFS;
2191
2192         err = setattr_prepare(dentry, attr);
2193         if (err != 0)
2194                 return err;
2195
2196         if ((attr->ia_valid & ATTR_SIZE) &&
2197             attr->ia_size > max(inode->i_size, fsc->max_file_size))
2198                 return -EFBIG;
2199
2200         if ((attr->ia_valid & ATTR_SIZE) &&
2201             ceph_quota_is_max_bytes_exceeded(inode, attr->ia_size))
2202                 return -EDQUOT;
2203
2204         err = __ceph_setattr(inode, attr);
2205
2206         if (err >= 0 && (attr->ia_valid & ATTR_MODE))
2207                 err = posix_acl_chmod(inode, attr->ia_mode);
2208
2209         return err;
2210 }
2211
2212 /*
2213  * Verify that we have a lease on the given mask.  If not,
2214  * do a getattr against an mds.
2215  */
2216 int __ceph_do_getattr(struct inode *inode, struct page *locked_page,
2217                       int mask, bool force)
2218 {
2219         struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
2220         struct ceph_mds_client *mdsc = fsc->mdsc;
2221         struct ceph_mds_request *req;
2222         int mode;
2223         int err;
2224
2225         if (ceph_snap(inode) == CEPH_SNAPDIR) {
2226                 dout("do_getattr inode %p SNAPDIR\n", inode);
2227                 return 0;
2228         }
2229
2230         dout("do_getattr inode %p mask %s mode 0%o\n",
2231              inode, ceph_cap_string(mask), inode->i_mode);
2232         if (!force && ceph_caps_issued_mask(ceph_inode(inode), mask, 1))
2233                 return 0;
2234
2235         mode = (mask & CEPH_STAT_RSTAT) ? USE_AUTH_MDS : USE_ANY_MDS;
2236         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, mode);
2237         if (IS_ERR(req))
2238                 return PTR_ERR(req);
2239         req->r_inode = inode;
2240         ihold(inode);
2241         req->r_num_caps = 1;
2242         req->r_args.getattr.mask = cpu_to_le32(mask);
2243         req->r_locked_page = locked_page;
2244         err = ceph_mdsc_do_request(mdsc, NULL, req);
2245         if (locked_page && err == 0) {
2246                 u64 inline_version = req->r_reply_info.targeti.inline_version;
2247                 if (inline_version == 0) {
2248                         /* the reply is supposed to contain inline data */
2249                         err = -EINVAL;
2250                 } else if (inline_version == CEPH_INLINE_NONE) {
2251                         err = -ENODATA;
2252                 } else {
2253                         err = req->r_reply_info.targeti.inline_len;
2254                 }
2255         }
2256         ceph_mdsc_put_request(req);
2257         dout("do_getattr result=%d\n", err);
2258         return err;
2259 }
2260
2261
2262 /*
2263  * Check inode permissions.  We verify we have a valid value for
2264  * the AUTH cap, then call the generic handler.
2265  */
2266 int ceph_permission(struct inode *inode, int mask)
2267 {
2268         int err;
2269
2270         if (mask & MAY_NOT_BLOCK)
2271                 return -ECHILD;
2272
2273         err = ceph_do_getattr(inode, CEPH_CAP_AUTH_SHARED, false);
2274
2275         if (!err)
2276                 err = generic_permission(inode, mask);
2277         return err;
2278 }
2279
2280 /* Craft a mask of needed caps given a set of requested statx attrs. */
2281 static int statx_to_caps(u32 want)
2282 {
2283         int mask = 0;
2284
2285         if (want & (STATX_MODE|STATX_UID|STATX_GID|STATX_CTIME))
2286                 mask |= CEPH_CAP_AUTH_SHARED;
2287
2288         if (want & (STATX_NLINK|STATX_CTIME))
2289                 mask |= CEPH_CAP_LINK_SHARED;
2290
2291         if (want & (STATX_ATIME|STATX_MTIME|STATX_CTIME|STATX_SIZE|
2292                     STATX_BLOCKS))
2293                 mask |= CEPH_CAP_FILE_SHARED;
2294
2295         if (want & (STATX_CTIME))
2296                 mask |= CEPH_CAP_XATTR_SHARED;
2297
2298         return mask;
2299 }
2300
2301 /*
2302  * Get all the attributes. If we have sufficient caps for the requested attrs,
2303  * then we can avoid talking to the MDS at all.
2304  */
2305 int ceph_getattr(const struct path *path, struct kstat *stat,
2306                  u32 request_mask, unsigned int flags)
2307 {
2308         struct inode *inode = d_inode(path->dentry);
2309         struct ceph_inode_info *ci = ceph_inode(inode);
2310         int err = 0;
2311
2312         /* Skip the getattr altogether if we're asked not to sync */
2313         if (!(flags & AT_STATX_DONT_SYNC)) {
2314                 err = ceph_do_getattr(inode, statx_to_caps(request_mask),
2315                                       flags & AT_STATX_FORCE_SYNC);
2316                 if (err)
2317                         return err;
2318         }
2319
2320         generic_fillattr(inode, stat);
2321         stat->ino = ceph_translate_ino(inode->i_sb, inode->i_ino);
2322         if (ceph_snap(inode) == CEPH_NOSNAP)
2323                 stat->dev = inode->i_sb->s_dev;
2324         else
2325                 stat->dev = ci->i_snapid_map ? ci->i_snapid_map->dev : 0;
2326
2327         if (S_ISDIR(inode->i_mode)) {
2328                 if (ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb),
2329                                         RBYTES))
2330                         stat->size = ci->i_rbytes;
2331                 else
2332                         stat->size = ci->i_files + ci->i_subdirs;
2333                 stat->blocks = 0;
2334                 stat->blksize = 65536;
2335                 /*
2336                  * Some applications rely on the number of st_nlink
2337                  * value on directories to be either 0 (if unlinked)
2338                  * or 2 + number of subdirectories.
2339                  */
2340                 if (stat->nlink == 1)
2341                         /* '.' + '..' + subdirs */
2342                         stat->nlink = 1 + 1 + ci->i_subdirs;
2343         }
2344
2345         /* Mask off any higher bits (e.g. btime) until we have support */
2346         stat->result_mask = request_mask & STATX_BASIC_STATS;
2347         return err;
2348 }