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(ci);
 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                 ceph_decode_timespec64(&ci->i_snap_btime, &iinfo->snap_btime);
 817         }
 818
 819         if ((new_version || (new_issued & CEPH_CAP_LINK_SHARED)) &&
 820             (issued & CEPH_CAP_LINK_EXCL) == 0)
 821                 set_nlink(inode, le32_to_cpu(info->nlink));
 822
 823         if (new_version || (new_issued & CEPH_CAP_ANY_RD)) {
 824                 /* be careful with mtime, atime, size */
 825                 ceph_decode_timespec64(&atime, &info->atime);
 826                 ceph_decode_timespec64(&mtime, &info->mtime);
 827                 ceph_decode_timespec64(&ctime, &info->ctime);
 828                 ceph_fill_file_time(inode, issued,
 829                                 le32_to_cpu(info->time_warp_seq),
 830                                 &ctime, &mtime, &atime);
 831         }
 832
 833         if (new_version || (info_caps & CEPH_CAP_FILE_SHARED)) {
 834                 ci->i_files = le64_to_cpu(info->files);
 835                 ci->i_subdirs = le64_to_cpu(info->subdirs);
 836         }
 837
 838         if (new_version ||
 839             (new_issued & (CEPH_CAP_ANY_FILE_RD | CEPH_CAP_ANY_FILE_WR))) {
 840                 s64 old_pool = ci->i_layout.pool_id;
 841                 struct ceph_string *old_ns;
 842
 843                 ceph_file_layout_from_legacy(&ci->i_layout, &info->layout);
 844                 old_ns = rcu_dereference_protected(ci->i_layout.pool_ns,
 845                                         lockdep_is_held(&ci->i_ceph_lock));
 846                 rcu_assign_pointer(ci->i_layout.pool_ns, pool_ns);
 847
 848                 if (ci->i_layout.pool_id != old_pool || pool_ns != old_ns)
 849                         ci->i_ceph_flags &= ~CEPH_I_POOL_PERM;
 850
 851                 pool_ns = old_ns;
 852
 853                 queue_trunc = ceph_fill_file_size(inode, issued,
 854                                         le32_to_cpu(info->truncate_seq),
 855                                         le64_to_cpu(info->truncate_size),
 856                                         le64_to_cpu(info->size));
 857                 /* only update max_size on auth cap */
 858                 if ((info->cap.flags & CEPH_CAP_FLAG_AUTH) &&
 859                     ci->i_max_size != le64_to_cpu(info->max_size)) {
 860                         dout("max_size %lld -> %llu\n", ci->i_max_size,
 861                                         le64_to_cpu(info->max_size));
 862                         ci->i_max_size = le64_to_cpu(info->max_size);
 863                 }
 864         }
 865
 866         /* layout and rstat are not tracked by capability, update them if
 867          * the inode info is from auth mds */
 868         if (new_version || (info->cap.flags & CEPH_CAP_FLAG_AUTH)) {
 869                 if (S_ISDIR(inode->i_mode)) {
 870                         ci->i_dir_layout = iinfo->dir_layout;
 871                         ci->i_rbytes = le64_to_cpu(info->rbytes);
 872                         ci->i_rfiles = le64_to_cpu(info->rfiles);
 873                         ci->i_rsubdirs = le64_to_cpu(info->rsubdirs);
 874                         ci->i_dir_pin = iinfo->dir_pin;
 875                         ceph_decode_timespec64(&ci->i_rctime, &info->rctime);
 876                 }
 877         }
 878
 879         /* xattrs */
 880         /* note that if i_xattrs.len <= 4, i_xattrs.data will still be NULL. */
 881         if ((ci->i_xattrs.version == 0 || !(issued & CEPH_CAP_XATTR_EXCL))  &&
 882             le64_to_cpu(info->xattr_version) > ci->i_xattrs.version) {
 883                 if (ci->i_xattrs.blob)
 884                         ceph_buffer_put(ci->i_xattrs.blob);
 885                 ci->i_xattrs.blob = xattr_blob;
 886                 if (xattr_blob)
 887                         memcpy(ci->i_xattrs.blob->vec.iov_base,
 888                                iinfo->xattr_data, iinfo->xattr_len);
 889                 ci->i_xattrs.version = le64_to_cpu(info->xattr_version);
 890                 ceph_forget_all_cached_acls(inode);
 891                 xattr_blob = NULL;
 892         }
 893
 894         /* finally update i_version */
 895         if (le64_to_cpu(info->version) > ci->i_version)
 896                 ci->i_version = le64_to_cpu(info->version);
 897
 898         inode->i_mapping->a_ops = &ceph_aops;
 899
 900         switch (inode->i_mode & S_IFMT) {
 901         case S_IFIFO:
 902         case S_IFBLK:
 903         case S_IFCHR:
 904         case S_IFSOCK:
 905                 inode->i_blkbits = PAGE_SHIFT;
 906                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
 907                 inode->i_op = &ceph_file_iops;
 908                 break;
 909         case S_IFREG:
 910                 inode->i_op = &ceph_file_iops;
 911                 inode->i_fop = &ceph_file_fops;
 912                 break;
 913         case S_IFLNK:
 914                 inode->i_op = &ceph_symlink_iops;
 915                 if (!ci->i_symlink) {
 916                         u32 symlen = iinfo->symlink_len;
 917                         char *sym;
 918
 919                         spin_unlock(&ci->i_ceph_lock);
 920
 921                         if (symlen != i_size_read(inode)) {
 922                                 pr_err("fill_inode %llx.%llx BAD symlink "
 923                                         "size %lld\n", ceph_vinop(inode),
 924                                         i_size_read(inode));
 925                                 i_size_write(inode, symlen);
 926                                 inode->i_blocks = calc_inode_blocks(symlen);
 927                         }
 928
 929                         err = -ENOMEM;
 930                         sym = kstrndup(iinfo->symlink, symlen, GFP_NOFS);
 931                         if (!sym)
 932                                 goto out;
 933
 934                         spin_lock(&ci->i_ceph_lock);
 935                         if (!ci->i_symlink)
 936                                 ci->i_symlink = sym;
 937                         else
 938                                 kfree(sym); /* lost a race */
 939                 }
 940                 inode->i_link = ci->i_symlink;
 941                 break;
 942         case S_IFDIR:
 943                 inode->i_op = &ceph_dir_iops;
 944                 inode->i_fop = &ceph_dir_fops;
 945                 break;
 946         default:
 947                 pr_err("fill_inode %llx.%llx BAD mode 0%o\n",
 948                        ceph_vinop(inode), inode->i_mode);
 949         }
 950
 951         /* were we issued a capability? */
 952         if (info_caps) {
 953                 if (ceph_snap(inode) == CEPH_NOSNAP) {
 954                         ceph_add_cap(inode, session,
 955                                      le64_to_cpu(info->cap.cap_id),
 956                                      cap_fmode, info_caps,
 957                                      le32_to_cpu(info->cap.wanted),
 958                                      le32_to_cpu(info->cap.seq),
 959                                      le32_to_cpu(info->cap.mseq),
 960                                      le64_to_cpu(info->cap.realm),
 961                                      info->cap.flags, &new_cap);
 962
 963                         /* set dir completion flag? */
 964                         if (S_ISDIR(inode->i_mode) &&
 965                             ci->i_files == 0 && ci->i_subdirs == 0 &&
 966                             (info_caps & CEPH_CAP_FILE_SHARED) &&
 967                             (issued & CEPH_CAP_FILE_EXCL) == 0 &&
 968                             !__ceph_dir_is_complete(ci)) {
 969                                 dout(" marking %p complete (empty)\n", inode);
 970                                 i_size_write(inode, 0);
 971                                 __ceph_dir_set_complete(ci,
 972                                         atomic64_read(&ci->i_release_count),
 973                                         atomic64_read(&ci->i_ordered_count));
 974                         }
 975
 976                         wake = true;
 977                 } else {
 978                         dout(" %p got snap_caps %s\n", inode,
 979                              ceph_cap_string(info_caps));
 980                         ci->i_snap_caps |= info_caps;
 981                         if (cap_fmode >= 0)
 982                                 __ceph_get_fmode(ci, cap_fmode);
 983                 }
 984         } else if (cap_fmode >= 0) {
 985                 pr_warn("mds issued no caps on %llx.%llx\n",
 986                            ceph_vinop(inode));
 987                 __ceph_get_fmode(ci, cap_fmode);
 988         }
 989
 990         if (iinfo->inline_version > 0 &&
 991             iinfo->inline_version >= ci->i_inline_version) {
 992                 int cache_caps = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO;
 993                 ci->i_inline_version = iinfo->inline_version;
 994                 if (ci->i_inline_version != CEPH_INLINE_NONE &&
 995                     (locked_page || (info_caps & cache_caps)))
 996                         fill_inline = true;
 997         }
 998
 999         spin_unlock(&ci->i_ceph_lock);
1000
1001         if (fill_inline)
1002                 ceph_fill_inline_data(inode, locked_page,
1003                                       iinfo->inline_data, iinfo->inline_len);
1004
1005         if (wake)
1006                 wake_up_all(&ci->i_cap_wq);
1007
1008         /* queue truncate if we saw i_size decrease */
1009         if (queue_trunc)
1010                 ceph_queue_vmtruncate(inode);
1011
1012         /* populate frag tree */
1013         if (S_ISDIR(inode->i_mode))
1014                 ceph_fill_fragtree(inode, &info->fragtree, dirinfo);
1015
1016         /* update delegation info? */
1017         if (dirinfo)
1018                 ceph_fill_dirfrag(inode, dirinfo);
1019
1020         err = 0;
1021 out:
1022         if (new_cap)
1023                 ceph_put_cap(mdsc, new_cap);
1024         if (xattr_blob)
1025                 ceph_buffer_put(xattr_blob);
1026         ceph_put_string(pool_ns);
1027         return err;
1028 }
1029
1030 /*
1031  * caller should hold session s_mutex and dentry->d_lock.
1032  */
1033 static void __update_dentry_lease(struct inode *dir, struct dentry *dentry,
1034                                   struct ceph_mds_reply_lease *lease,
1035                                   struct ceph_mds_session *session,
1036                                   unsigned long from_time,
1037                                   struct ceph_mds_session **old_lease_session)
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
1044         dout("update_dentry_lease %p duration %lu ms ttl %lu\n",
1045              dentry, duration, ttl);
1046
1047         /* only track leases on regular dentries */
1048         if (ceph_snap(dir) != CEPH_NOSNAP)
1049                 return;
1050
1051         di->lease_shared_gen = atomic_read(&ceph_inode(dir)->i_shared_gen);
1052         if (duration == 0) {
1053                 __ceph_dentry_dir_lease_touch(di);
1054                 return;
1055         }
1056
1057         if (di->lease_gen == session->s_cap_gen &&
1058             time_before(ttl, di->time))
1059                 return;  /* we already have a newer lease. */
1060
1061         if (di->lease_session && di->lease_session != session) {
1062                 *old_lease_session = di->lease_session;
1063                 di->lease_session = NULL;
1064         }
1065
1066         if (!di->lease_session)
1067                 di->lease_session = ceph_get_mds_session(session);
1068         di->lease_gen = session->s_cap_gen;
1069         di->lease_seq = le32_to_cpu(lease->seq);
1070         di->lease_renew_after = half_ttl;
1071         di->lease_renew_from = 0;
1072         di->time = ttl;
1073
1074         __ceph_dentry_lease_touch(di);
1075 }
1076
1077 static inline void update_dentry_lease(struct inode *dir, struct dentry *dentry,
1078                                         struct ceph_mds_reply_lease *lease,
1079                                         struct ceph_mds_session *session,
1080                                         unsigned long from_time)
1081 {
1082         struct ceph_mds_session *old_lease_session = NULL;
1083         spin_lock(&dentry->d_lock);
1084         __update_dentry_lease(dir, dentry, lease, session, from_time,
1085                               &old_lease_session);
1086         spin_unlock(&dentry->d_lock);
1087         if (old_lease_session)
1088                 ceph_put_mds_session(old_lease_session);
1089 }
1090
1091 /*
1092  * update dentry lease without having parent inode locked
1093  */
1094 static void update_dentry_lease_careful(struct dentry *dentry,
1095                                         struct ceph_mds_reply_lease *lease,
1096                                         struct ceph_mds_session *session,
1097                                         unsigned long from_time,
1098                                         char *dname, u32 dname_len,
1099                                         struct ceph_vino *pdvino,
1100                                         struct ceph_vino *ptvino)
1101
1102 {
1103         struct inode *dir;
1104         struct ceph_mds_session *old_lease_session = NULL;
1105
1106         spin_lock(&dentry->d_lock);
1107         /* make sure dentry's name matches target */
1108         if (dentry->d_name.len != dname_len ||
1109             memcmp(dentry->d_name.name, dname, dname_len))
1110                 goto out_unlock;
1111
1112         dir = d_inode(dentry->d_parent);
1113         /* make sure parent matches dvino */
1114         if (!ceph_ino_compare(dir, pdvino))
1115                 goto out_unlock;
1116
1117         /* make sure dentry's inode matches target. NULL ptvino means that
1118          * we expect a negative dentry */
1119         if (ptvino) {
1120                 if (d_really_is_negative(dentry))
1121                         goto out_unlock;
1122                 if (!ceph_ino_compare(d_inode(dentry), ptvino))
1123                         goto out_unlock;
1124         } else {
1125                 if (d_really_is_positive(dentry))
1126                         goto out_unlock;
1127         }
1128
1129         __update_dentry_lease(dir, dentry, lease, session,
1130                               from_time, &old_lease_session);
1131 out_unlock:
1132         spin_unlock(&dentry->d_lock);
1133         if (old_lease_session)
1134                 ceph_put_mds_session(old_lease_session);
1135 }
1136
1137 /*
1138  * splice a dentry to an inode.
1139  * caller must hold directory i_mutex for this to be safe.
1140  */
1141 static int splice_dentry(struct dentry **pdn, struct inode *in)
1142 {
1143         struct dentry *dn = *pdn;
1144         struct dentry *realdn;
1145
1146         BUG_ON(d_inode(dn));
1147
1148         if (S_ISDIR(in->i_mode)) {
1149                 /* If inode is directory, d_splice_alias() below will remove
1150                  * 'realdn' from its origin parent. We need to ensure that
1151                  * origin parent's readdir cache will not reference 'realdn'
1152                  */
1153                 realdn = d_find_any_alias(in);
1154                 if (realdn) {
1155                         struct ceph_dentry_info *di = ceph_dentry(realdn);
1156                         spin_lock(&realdn->d_lock);
1157
1158                         realdn->d_op->d_prune(realdn);
1159
1160                         di->time = jiffies;
1161                         di->lease_shared_gen = 0;
1162                         di->offset = 0;
1163
1164                         spin_unlock(&realdn->d_lock);
1165                         dput(realdn);
1166                 }
1167         }
1168
1169         /* dn must be unhashed */
1170         if (!d_unhashed(dn))
1171                 d_drop(dn);
1172         realdn = d_splice_alias(in, dn);
1173         if (IS_ERR(realdn)) {
1174                 pr_err("splice_dentry error %ld %p inode %p ino %llx.%llx\n",
1175                        PTR_ERR(realdn), dn, in, ceph_vinop(in));
1176                 return PTR_ERR(realdn);
1177         }
1178
1179         if (realdn) {
1180                 dout("dn %p (%d) spliced with %p (%d) "
1181                      "inode %p ino %llx.%llx\n",
1182                      dn, d_count(dn),
1183                      realdn, d_count(realdn),
1184                      d_inode(realdn), ceph_vinop(d_inode(realdn)));
1185                 dput(dn);
1186                 *pdn = realdn;
1187         } else {
1188                 BUG_ON(!ceph_dentry(dn));
1189                 dout("dn %p attached to %p ino %llx.%llx\n",
1190                      dn, d_inode(dn), ceph_vinop(d_inode(dn)));
1191         }
1192         return 0;
1193 }
1194
1195 /*
1196  * Incorporate results into the local cache.  This is either just
1197  * one inode, or a directory, dentry, and possibly linked-to inode (e.g.,
1198  * after a lookup).
1199  *
1200  * A reply may contain
1201  *         a directory inode along with a dentry.
1202  *  and/or a target inode
1203  *
1204  * Called with snap_rwsem (read).
1205  */
1206 int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req)
1207 {
1208         struct ceph_mds_session *session = req->r_session;
1209         struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1210         struct inode *in = NULL;
1211         struct ceph_vino tvino, dvino;
1212         struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
1213         int err = 0;
1214
1215         dout("fill_trace %p is_dentry %d is_target %d\n", req,
1216              rinfo->head->is_dentry, rinfo->head->is_target);
1217
1218         if (!rinfo->head->is_target && !rinfo->head->is_dentry) {
1219                 dout("fill_trace reply is empty!\n");
1220                 if (rinfo->head->result == 0 && req->r_parent)
1221                         ceph_invalidate_dir_request(req);
1222                 return 0;
1223         }
1224
1225         if (rinfo->head->is_dentry) {
1226                 struct inode *dir = req->r_parent;
1227
1228                 if (dir) {
1229                         err = fill_inode(dir, NULL,
1230                                          &rinfo->diri, rinfo->dirfrag,
1231                                          session, req->r_request_started, -1,
1232                                          &req->r_caps_reservation);
1233                         if (err < 0)
1234                                 goto done;
1235                 } else {
1236                         WARN_ON_ONCE(1);
1237                 }
1238
1239                 if (dir && req->r_op == CEPH_MDS_OP_LOOKUPNAME &&
1240                     test_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags) &&
1241                     !test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
1242                         struct qstr dname;
1243                         struct dentry *dn, *parent;
1244
1245                         BUG_ON(!rinfo->head->is_target);
1246                         BUG_ON(req->r_dentry);
1247
1248                         parent = d_find_any_alias(dir);
1249                         BUG_ON(!parent);
1250
1251                         dname.name = rinfo->dname;
1252                         dname.len = rinfo->dname_len;
1253                         dname.hash = full_name_hash(parent, dname.name, dname.len);
1254                         tvino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1255                         tvino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1256 retry_lookup:
1257                         dn = d_lookup(parent, &dname);
1258                         dout("d_lookup on parent=%p name=%.*s got %p\n",
1259                              parent, dname.len, dname.name, dn);
1260
1261                         if (!dn) {
1262                                 dn = d_alloc(parent, &dname);
1263                                 dout("d_alloc %p '%.*s' = %p\n", parent,
1264                                      dname.len, dname.name, dn);
1265                                 if (!dn) {
1266                                         dput(parent);
1267                                         err = -ENOMEM;
1268                                         goto done;
1269                                 }
1270                                 err = 0;
1271                         } else if (d_really_is_positive(dn) &&
1272                                    (ceph_ino(d_inode(dn)) != tvino.ino ||
1273                                     ceph_snap(d_inode(dn)) != tvino.snap)) {
1274                                 dout(" dn %p points to wrong inode %p\n",
1275                                      dn, d_inode(dn));
1276                                 ceph_dir_clear_ordered(dir);
1277                                 d_delete(dn);
1278                                 dput(dn);
1279                                 goto retry_lookup;
1280                         }
1281
1282                         req->r_dentry = dn;
1283                         dput(parent);
1284                 }
1285         }
1286
1287         if (rinfo->head->is_target) {
1288                 tvino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1289                 tvino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1290
1291                 in = ceph_get_inode(sb, tvino);
1292                 if (IS_ERR(in)) {
1293                         err = PTR_ERR(in);
1294                         goto done;
1295                 }
1296                 req->r_target_inode = in;
1297
1298                 err = fill_inode(in, req->r_locked_page, &rinfo->targeti, NULL,
1299                                 session, req->r_request_started,
1300                                 (!test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags) &&
1301                                 rinfo->head->result == 0) ?  req->r_fmode : -1,
1302                                 &req->r_caps_reservation);
1303                 if (err < 0) {
1304                         pr_err("fill_inode badness %p %llx.%llx\n",
1305                                 in, ceph_vinop(in));
1306                         goto done;
1307                 }
1308         }
1309
1310         /*
1311          * ignore null lease/binding on snapdir ENOENT, or else we
1312          * will have trouble splicing in the virtual snapdir later
1313          */
1314         if (rinfo->head->is_dentry &&
1315             !test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags) &&
1316             test_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags) &&
1317             (rinfo->head->is_target || strncmp(req->r_dentry->d_name.name,
1318                                                fsc->mount_options->snapdir_name,
1319                                                req->r_dentry->d_name.len))) {
1320                 /*
1321                  * lookup link rename   : null -> possibly existing inode
1322                  * mknod symlink mkdir  : null -> new inode
1323                  * unlink               : linked -> null
1324                  */
1325                 struct inode *dir = req->r_parent;
1326                 struct dentry *dn = req->r_dentry;
1327                 bool have_dir_cap, have_lease;
1328
1329                 BUG_ON(!dn);
1330                 BUG_ON(!dir);
1331                 BUG_ON(d_inode(dn->d_parent) != dir);
1332
1333                 dvino.ino = le64_to_cpu(rinfo->diri.in->ino);
1334                 dvino.snap = le64_to_cpu(rinfo->diri.in->snapid);
1335
1336                 BUG_ON(ceph_ino(dir) != dvino.ino);
1337                 BUG_ON(ceph_snap(dir) != dvino.snap);
1338
1339                 /* do we have a lease on the whole dir? */
1340                 have_dir_cap =
1341                         (le32_to_cpu(rinfo->diri.in->cap.caps) &
1342                          CEPH_CAP_FILE_SHARED);
1343
1344                 /* do we have a dn lease? */
1345                 have_lease = have_dir_cap ||
1346                         le32_to_cpu(rinfo->dlease->duration_ms);
1347                 if (!have_lease)
1348                         dout("fill_trace  no dentry lease or dir cap\n");
1349
1350                 /* rename? */
1351                 if (req->r_old_dentry && req->r_op == CEPH_MDS_OP_RENAME) {
1352                         struct inode *olddir = req->r_old_dentry_dir;
1353                         BUG_ON(!olddir);
1354
1355                         dout(" src %p '%pd' dst %p '%pd'\n",
1356                              req->r_old_dentry,
1357                              req->r_old_dentry,
1358                              dn, dn);
1359                         dout("fill_trace doing d_move %p -> %p\n",
1360                              req->r_old_dentry, dn);
1361
1362                         /* d_move screws up sibling dentries' offsets */
1363                         ceph_dir_clear_ordered(dir);
1364                         ceph_dir_clear_ordered(olddir);
1365
1366                         d_move(req->r_old_dentry, dn);
1367                         dout(" src %p '%pd' dst %p '%pd'\n",
1368                              req->r_old_dentry,
1369                              req->r_old_dentry,
1370                              dn, dn);
1371
1372                         /* ensure target dentry is invalidated, despite
1373                            rehashing bug in vfs_rename_dir */
1374                         ceph_invalidate_dentry_lease(dn);
1375
1376                         dout("dn %p gets new offset %lld\n", req->r_old_dentry,
1377                              ceph_dentry(req->r_old_dentry)->offset);
1378
1379                         /* swap r_dentry and r_old_dentry in case that
1380                          * splice_dentry() gets called later. This is safe
1381                          * because no other place will use them */
1382                         req->r_dentry = req->r_old_dentry;
1383                         req->r_old_dentry = dn;
1384                         dn = req->r_dentry;
1385                 }
1386
1387                 /* null dentry? */
1388                 if (!rinfo->head->is_target) {
1389                         dout("fill_trace null dentry\n");
1390                         if (d_really_is_positive(dn)) {
1391                                 dout("d_delete %p\n", dn);
1392                                 ceph_dir_clear_ordered(dir);
1393                                 d_delete(dn);
1394                         } else if (have_lease) {
1395                                 if (d_unhashed(dn))
1396                                         d_add(dn, NULL);
1397                                 update_dentry_lease(dir, dn,
1398                                                     rinfo->dlease, session,
1399                                                     req->r_request_started);
1400                         }
1401                         goto done;
1402                 }
1403
1404                 /* attach proper inode */
1405                 if (d_really_is_negative(dn)) {
1406                         ceph_dir_clear_ordered(dir);
1407                         ihold(in);
1408                         err = splice_dentry(&req->r_dentry, in);
1409                         if (err < 0)
1410                                 goto done;
1411                         dn = req->r_dentry;  /* may have spliced */
1412                 } else if (d_really_is_positive(dn) && d_inode(dn) != in) {
1413                         dout(" %p links to %p %llx.%llx, not %llx.%llx\n",
1414                              dn, d_inode(dn), ceph_vinop(d_inode(dn)),
1415                              ceph_vinop(in));
1416                         d_invalidate(dn);
1417                         have_lease = false;
1418                 }
1419
1420                 if (have_lease) {
1421                         update_dentry_lease(dir, dn,
1422                                             rinfo->dlease, session,
1423                                             req->r_request_started);
1424                 }
1425                 dout(" final dn %p\n", dn);
1426         } else if ((req->r_op == CEPH_MDS_OP_LOOKUPSNAP ||
1427                     req->r_op == CEPH_MDS_OP_MKSNAP) &&
1428                    !test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
1429                 struct inode *dir = req->r_parent;
1430
1431                 /* fill out a snapdir LOOKUPSNAP dentry */
1432                 BUG_ON(!dir);
1433                 BUG_ON(ceph_snap(dir) != CEPH_SNAPDIR);
1434                 BUG_ON(!req->r_dentry);
1435                 dout(" linking snapped dir %p to dn %p\n", in, req->r_dentry);
1436                 ceph_dir_clear_ordered(dir);
1437                 ihold(in);
1438                 err = splice_dentry(&req->r_dentry, in);
1439                 if (err < 0)
1440                         goto done;
1441         } else if (rinfo->head->is_dentry && req->r_dentry) {
1442                 /* parent inode is not locked, be carefull */
1443                 struct ceph_vino *ptvino = NULL;
1444                 dvino.ino = le64_to_cpu(rinfo->diri.in->ino);
1445                 dvino.snap = le64_to_cpu(rinfo->diri.in->snapid);
1446                 if (rinfo->head->is_target) {
1447                         tvino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1448                         tvino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1449                         ptvino = &tvino;
1450                 }
1451                 update_dentry_lease_careful(req->r_dentry, rinfo->dlease,
1452                                             session, req->r_request_started,
1453                                             rinfo->dname, rinfo->dname_len,
1454                                             &dvino, ptvino);
1455         }
1456 done:
1457         dout("fill_trace done err=%d\n", err);
1458         return err;
1459 }
1460
1461 /*
1462  * Prepopulate our cache with readdir results, leases, etc.
1463  */
1464 static int readdir_prepopulate_inodes_only(struct ceph_mds_request *req,
1465                                            struct ceph_mds_session *session)
1466 {
1467         struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1468         int i, err = 0;
1469
1470         for (i = 0; i < rinfo->dir_nr; i++) {
1471                 struct ceph_mds_reply_dir_entry *rde = rinfo->dir_entries + i;
1472                 struct ceph_vino vino;
1473                 struct inode *in;
1474                 int rc;
1475
1476                 vino.ino = le64_to_cpu(rde->inode.in->ino);
1477                 vino.snap = le64_to_cpu(rde->inode.in->snapid);
1478
1479                 in = ceph_get_inode(req->r_dentry->d_sb, vino);
1480                 if (IS_ERR(in)) {
1481                         err = PTR_ERR(in);
1482                         dout("new_inode badness got %d\n", err);
1483                         continue;
1484                 }
1485                 rc = fill_inode(in, NULL, &rde->inode, NULL, session,
1486                                 req->r_request_started, -1,
1487                                 &req->r_caps_reservation);
1488                 if (rc < 0) {
1489                         pr_err("fill_inode badness on %p got %d\n", in, rc);
1490                         err = rc;
1491                 }
1492                 /* avoid calling iput_final() in mds dispatch threads */
1493                 ceph_async_iput(in);
1494         }
1495
1496         return err;
1497 }
1498
1499 void ceph_readdir_cache_release(struct ceph_readdir_cache_control *ctl)
1500 {
1501         if (ctl->page) {
1502                 kunmap(ctl->page);
1503                 put_page(ctl->page);
1504                 ctl->page = NULL;
1505         }
1506 }
1507
1508 static int fill_readdir_cache(struct inode *dir, struct dentry *dn,
1509                               struct ceph_readdir_cache_control *ctl,
1510                               struct ceph_mds_request *req)
1511 {
1512         struct ceph_inode_info *ci = ceph_inode(dir);
1513         unsigned nsize = PAGE_SIZE / sizeof(struct dentry*);
1514         unsigned idx = ctl->index % nsize;
1515         pgoff_t pgoff = ctl->index / nsize;
1516
1517         if (!ctl->page || pgoff != page_index(ctl->page)) {
1518                 ceph_readdir_cache_release(ctl);
1519                 if (idx == 0)
1520                         ctl->page = grab_cache_page(&dir->i_data, pgoff);
1521                 else
1522                         ctl->page = find_lock_page(&dir->i_data, pgoff);
1523                 if (!ctl->page) {
1524                         ctl->index = -1;
1525                         return idx == 0 ? -ENOMEM : 0;
1526                 }
1527                 /* reading/filling the cache are serialized by
1528                  * i_mutex, no need to use page lock */
1529                 unlock_page(ctl->page);
1530                 ctl->dentries = kmap(ctl->page);
1531                 if (idx == 0)
1532                         memset(ctl->dentries, 0, PAGE_SIZE);
1533         }
1534
1535         if (req->r_dir_release_cnt == atomic64_read(&ci->i_release_count) &&
1536             req->r_dir_ordered_cnt == atomic64_read(&ci->i_ordered_count)) {
1537                 dout("readdir cache dn %p idx %d\n", dn, ctl->index);
1538                 ctl->dentries[idx] = dn;
1539                 ctl->index++;
1540         } else {
1541                 dout("disable readdir cache\n");
1542                 ctl->index = -1;
1543         }
1544         return 0;
1545 }
1546
1547 int ceph_readdir_prepopulate(struct ceph_mds_request *req,
1548                              struct ceph_mds_session *session)
1549 {
1550         struct dentry *parent = req->r_dentry;
1551         struct ceph_inode_info *ci = ceph_inode(d_inode(parent));
1552         struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1553         struct qstr dname;
1554         struct dentry *dn;
1555         struct inode *in;
1556         int err = 0, skipped = 0, ret, i;
1557         struct ceph_mds_request_head *rhead = req->r_request->front.iov_base;
1558         u32 frag = le32_to_cpu(rhead->args.readdir.frag);
1559         u32 last_hash = 0;
1560         u32 fpos_offset;
1561         struct ceph_readdir_cache_control cache_ctl = {};
1562
1563         if (test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags))
1564                 return readdir_prepopulate_inodes_only(req, session);
1565
1566         if (rinfo->hash_order) {
1567                 if (req->r_path2) {
1568                         last_hash = ceph_str_hash(ci->i_dir_layout.dl_dir_hash,
1569                                                   req->r_path2,
1570                                                   strlen(req->r_path2));
1571                         last_hash = ceph_frag_value(last_hash);
1572                 } else if (rinfo->offset_hash) {
1573                         /* mds understands offset_hash */
1574                         WARN_ON_ONCE(req->r_readdir_offset != 2);
1575                         last_hash = le32_to_cpu(rhead->args.readdir.offset_hash);
1576                 }
1577         }
1578
1579         if (rinfo->dir_dir &&
1580             le32_to_cpu(rinfo->dir_dir->frag) != frag) {
1581                 dout("readdir_prepopulate got new frag %x -> %x\n",
1582                      frag, le32_to_cpu(rinfo->dir_dir->frag));
1583                 frag = le32_to_cpu(rinfo->dir_dir->frag);
1584                 if (!rinfo->hash_order)
1585                         req->r_readdir_offset = 2;
1586         }
1587
1588         if (le32_to_cpu(rinfo->head->op) == CEPH_MDS_OP_LSSNAP) {
1589                 dout("readdir_prepopulate %d items under SNAPDIR dn %p\n",
1590                      rinfo->dir_nr, parent);
1591         } else {
1592                 dout("readdir_prepopulate %d items under dn %p\n",
1593                      rinfo->dir_nr, parent);
1594                 if (rinfo->dir_dir)
1595                         ceph_fill_dirfrag(d_inode(parent), rinfo->dir_dir);
1596
1597                 if (ceph_frag_is_leftmost(frag) &&
1598                     req->r_readdir_offset == 2 &&
1599                     !(rinfo->hash_order && last_hash)) {
1600                         /* note dir version at start of readdir so we can
1601                          * tell if any dentries get dropped */
1602                         req->r_dir_release_cnt =
1603                                 atomic64_read(&ci->i_release_count);
1604                         req->r_dir_ordered_cnt =
1605                                 atomic64_read(&ci->i_ordered_count);
1606                         req->r_readdir_cache_idx = 0;
1607                 }
1608         }
1609
1610         cache_ctl.index = req->r_readdir_cache_idx;
1611         fpos_offset = req->r_readdir_offset;
1612
1613         /* FIXME: release caps/leases if error occurs */
1614         for (i = 0; i < rinfo->dir_nr; i++) {
1615                 struct ceph_mds_reply_dir_entry *rde = rinfo->dir_entries + i;
1616                 struct ceph_vino tvino;
1617
1618                 dname.name = rde->name;
1619                 dname.len = rde->name_len;
1620                 dname.hash = full_name_hash(parent, dname.name, dname.len);
1621
1622                 tvino.ino = le64_to_cpu(rde->inode.in->ino);
1623                 tvino.snap = le64_to_cpu(rde->inode.in->snapid);
1624
1625                 if (rinfo->hash_order) {
1626                         u32 hash = ceph_str_hash(ci->i_dir_layout.dl_dir_hash,
1627                                                  rde->name, rde->name_len);
1628                         hash = ceph_frag_value(hash);
1629                         if (hash != last_hash)
1630                                 fpos_offset = 2;
1631                         last_hash = hash;
1632                         rde->offset = ceph_make_fpos(hash, fpos_offset++, true);
1633                 } else {
1634                         rde->offset = ceph_make_fpos(frag, fpos_offset++, false);
1635                 }
1636
1637 retry_lookup:
1638                 dn = d_lookup(parent, &dname);
1639                 dout("d_lookup on parent=%p name=%.*s got %p\n",
1640                      parent, dname.len, dname.name, dn);
1641
1642                 if (!dn) {
1643                         dn = d_alloc(parent, &dname);
1644                         dout("d_alloc %p '%.*s' = %p\n", parent,
1645                              dname.len, dname.name, dn);
1646                         if (!dn) {
1647                                 dout("d_alloc badness\n");
1648                                 err = -ENOMEM;
1649                                 goto out;
1650                         }
1651                 } else if (d_really_is_positive(dn) &&
1652                            (ceph_ino(d_inode(dn)) != tvino.ino ||
1653                             ceph_snap(d_inode(dn)) != tvino.snap)) {
1654                         struct ceph_dentry_info *di = ceph_dentry(dn);
1655                         dout(" dn %p points to wrong inode %p\n",
1656                              dn, d_inode(dn));
1657
1658                         spin_lock(&dn->d_lock);
1659                         if (di->offset > 0 &&
1660                             di->lease_shared_gen ==
1661                             atomic_read(&ci->i_shared_gen)) {
1662                                 __ceph_dir_clear_ordered(ci);
1663                                 di->offset = 0;
1664                         }
1665                         spin_unlock(&dn->d_lock);
1666
1667                         d_delete(dn);
1668                         dput(dn);
1669                         goto retry_lookup;
1670                 }
1671
1672                 /* inode */
1673                 if (d_really_is_positive(dn)) {
1674                         in = d_inode(dn);
1675                 } else {
1676                         in = ceph_get_inode(parent->d_sb, tvino);
1677                         if (IS_ERR(in)) {
1678                                 dout("new_inode badness\n");
1679                                 d_drop(dn);
1680                                 dput(dn);
1681                                 err = PTR_ERR(in);
1682                                 goto out;
1683                         }
1684                 }
1685
1686                 ret = fill_inode(in, NULL, &rde->inode, NULL, session,
1687                                  req->r_request_started, -1,
1688                                  &req->r_caps_reservation);
1689                 if (ret < 0) {
1690                         pr_err("fill_inode badness on %p\n", in);
1691                         if (d_really_is_negative(dn)) {
1692                                 /* avoid calling iput_final() in mds
1693                                  * dispatch threads */
1694                                 ceph_async_iput(in);
1695                         }
1696                         d_drop(dn);
1697                         err = ret;
1698                         goto next_item;
1699                 }
1700
1701                 if (d_really_is_negative(dn)) {
1702                         if (ceph_security_xattr_deadlock(in)) {
1703                                 dout(" skip splicing dn %p to inode %p"
1704                                      " (security xattr deadlock)\n", dn, in);
1705                                 ceph_async_iput(in);
1706                                 skipped++;
1707                                 goto next_item;
1708                         }
1709
1710                         err = splice_dentry(&dn, in);
1711                         if (err < 0)
1712                                 goto next_item;
1713                 }
1714
1715                 ceph_dentry(dn)->offset = rde->offset;
1716
1717                 update_dentry_lease(d_inode(parent), dn,
1718                                     rde->lease, req->r_session,
1719                                     req->r_request_started);
1720
1721                 if (err == 0 && skipped == 0 && cache_ctl.index >= 0) {
1722                         ret = fill_readdir_cache(d_inode(parent), dn,
1723                                                  &cache_ctl, req);
1724                         if (ret < 0)
1725                                 err = ret;
1726                 }
1727 next_item:
1728                 dput(dn);
1729         }
1730 out:
1731         if (err == 0 && skipped == 0) {
1732                 set_bit(CEPH_MDS_R_DID_PREPOPULATE, &req->r_req_flags);
1733                 req->r_readdir_cache_idx = cache_ctl.index;
1734         }
1735         ceph_readdir_cache_release(&cache_ctl);
1736         dout("readdir_prepopulate done\n");
1737         return err;
1738 }
1739
1740 bool ceph_inode_set_size(struct inode *inode, loff_t size)
1741 {
1742         struct ceph_inode_info *ci = ceph_inode(inode);
1743         bool ret;
1744
1745         spin_lock(&ci->i_ceph_lock);
1746         dout("set_size %p %llu -> %llu\n", inode, inode->i_size, size);
1747         i_size_write(inode, size);
1748         inode->i_blocks = calc_inode_blocks(size);
1749
1750         ret = __ceph_should_report_size(ci);
1751
1752         spin_unlock(&ci->i_ceph_lock);
1753         return ret;
1754 }
1755
1756 /*
1757  * Put reference to inode, but avoid calling iput_final() in current thread.
1758  * iput_final() may wait for reahahead pages. The wait can cause deadlock in
1759  * some contexts.
1760  */
1761 void ceph_async_iput(struct inode *inode)
1762 {
1763         if (!inode)
1764                 return;
1765         for (;;) {
1766                 if (atomic_add_unless(&inode->i_count, -1, 1))
1767                         break;
1768                 if (queue_work(ceph_inode_to_client(inode)->inode_wq,
1769                                &ceph_inode(inode)->i_work))
1770                         break;
1771                 /* queue work failed, i_count must be at least 2 */
1772         }
1773 }
1774
1775 /*
1776  * Write back inode data in a worker thread.  (This can't be done
1777  * in the message handler context.)
1778  */
1779 void ceph_queue_writeback(struct inode *inode)
1780 {
1781         struct ceph_inode_info *ci = ceph_inode(inode);
1782         set_bit(CEPH_I_WORK_WRITEBACK, &ci->i_work_mask);
1783
1784         ihold(inode);
1785         if (queue_work(ceph_inode_to_client(inode)->inode_wq,
1786                        &ci->i_work)) {
1787                 dout("ceph_queue_writeback %p\n", inode);
1788         } else {
1789                 dout("ceph_queue_writeback %p already queued, mask=%lx\n",
1790                      inode, ci->i_work_mask);
1791                 iput(inode);
1792         }
1793 }
1794
1795 /*
1796  * queue an async invalidation
1797  */
1798 void ceph_queue_invalidate(struct inode *inode)
1799 {
1800         struct ceph_inode_info *ci = ceph_inode(inode);
1801         set_bit(CEPH_I_WORK_INVALIDATE_PAGES, &ci->i_work_mask);
1802
1803         ihold(inode);
1804         if (queue_work(ceph_inode_to_client(inode)->inode_wq,
1805                        &ceph_inode(inode)->i_work)) {
1806                 dout("ceph_queue_invalidate %p\n", inode);
1807         } else {
1808                 dout("ceph_queue_invalidate %p already queued, mask=%lx\n",
1809                      inode, ci->i_work_mask);
1810                 iput(inode);
1811         }
1812 }
1813
1814 /*
1815  * Queue an async vmtruncate.  If we fail to queue work, we will handle
1816  * the truncation the next time we call __ceph_do_pending_vmtruncate.
1817  */
1818 void ceph_queue_vmtruncate(struct inode *inode)
1819 {
1820         struct ceph_inode_info *ci = ceph_inode(inode);
1821         set_bit(CEPH_I_WORK_VMTRUNCATE, &ci->i_work_mask);
1822
1823         ihold(inode);
1824         if (queue_work(ceph_inode_to_client(inode)->inode_wq,
1825                        &ci->i_work)) {
1826                 dout("ceph_queue_vmtruncate %p\n", inode);
1827         } else {
1828                 dout("ceph_queue_vmtruncate %p already queued, mask=%lx\n",
1829                      inode, ci->i_work_mask);
1830                 iput(inode);
1831         }
1832 }
1833
1834 static void ceph_do_invalidate_pages(struct inode *inode)
1835 {
1836         struct ceph_inode_info *ci = ceph_inode(inode);
1837         struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1838         u32 orig_gen;
1839         int check = 0;
1840
1841         mutex_lock(&ci->i_truncate_mutex);
1842
1843         if (READ_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) {
1844                 pr_warn_ratelimited("invalidate_pages %p %lld forced umount\n",
1845                                     inode, ceph_ino(inode));
1846                 mapping_set_error(inode->i_mapping, -EIO);
1847                 truncate_pagecache(inode, 0);
1848                 mutex_unlock(&ci->i_truncate_mutex);
1849                 goto out;
1850         }
1851
1852         spin_lock(&ci->i_ceph_lock);
1853         dout("invalidate_pages %p gen %d revoking %d\n", inode,
1854              ci->i_rdcache_gen, ci->i_rdcache_revoking);
1855         if (ci->i_rdcache_revoking != ci->i_rdcache_gen) {
1856                 if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE))
1857                         check = 1;
1858                 spin_unlock(&ci->i_ceph_lock);
1859                 mutex_unlock(&ci->i_truncate_mutex);
1860                 goto out;
1861         }
1862         orig_gen = ci->i_rdcache_gen;
1863         spin_unlock(&ci->i_ceph_lock);
1864
1865         if (invalidate_inode_pages2(inode->i_mapping) < 0) {
1866                 pr_err("invalidate_pages %p fails\n", inode);
1867         }
1868
1869         spin_lock(&ci->i_ceph_lock);
1870         if (orig_gen == ci->i_rdcache_gen &&
1871             orig_gen == ci->i_rdcache_revoking) {
1872                 dout("invalidate_pages %p gen %d successful\n", inode,
1873                      ci->i_rdcache_gen);
1874                 ci->i_rdcache_revoking--;
1875                 check = 1;
1876         } else {
1877                 dout("invalidate_pages %p gen %d raced, now %d revoking %d\n",
1878                      inode, orig_gen, ci->i_rdcache_gen,
1879                      ci->i_rdcache_revoking);
1880                 if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE))
1881                         check = 1;
1882         }
1883         spin_unlock(&ci->i_ceph_lock);
1884         mutex_unlock(&ci->i_truncate_mutex);
1885 out:
1886         if (check)
1887                 ceph_check_caps(ci, 0, NULL);
1888 }
1889
1890 /*
1891  * Make sure any pending truncation is applied before doing anything
1892  * that may depend on it.
1893  */
1894 void __ceph_do_pending_vmtruncate(struct inode *inode)
1895 {
1896         struct ceph_inode_info *ci = ceph_inode(inode);
1897         u64 to;
1898         int wrbuffer_refs, finish = 0;
1899
1900         mutex_lock(&ci->i_truncate_mutex);
1901 retry:
1902         spin_lock(&ci->i_ceph_lock);
1903         if (ci->i_truncate_pending == 0) {
1904                 dout("__do_pending_vmtruncate %p none pending\n", inode);
1905                 spin_unlock(&ci->i_ceph_lock);
1906                 mutex_unlock(&ci->i_truncate_mutex);
1907                 return;
1908         }
1909
1910         /*
1911          * make sure any dirty snapped pages are flushed before we
1912          * possibly truncate them.. so write AND block!
1913          */
1914         if (ci->i_wrbuffer_ref_head < ci->i_wrbuffer_ref) {
1915                 spin_unlock(&ci->i_ceph_lock);
1916                 dout("__do_pending_vmtruncate %p flushing snaps first\n",
1917                      inode);
1918                 filemap_write_and_wait_range(&inode->i_data, 0,
1919                                              inode->i_sb->s_maxbytes);
1920                 goto retry;
1921         }
1922
1923         /* there should be no reader or writer */
1924         WARN_ON_ONCE(ci->i_rd_ref || ci->i_wr_ref);
1925
1926         to = ci->i_truncate_size;
1927         wrbuffer_refs = ci->i_wrbuffer_ref;
1928         dout("__do_pending_vmtruncate %p (%d) to %lld\n", inode,
1929              ci->i_truncate_pending, to);
1930         spin_unlock(&ci->i_ceph_lock);
1931
1932         truncate_pagecache(inode, to);
1933
1934         spin_lock(&ci->i_ceph_lock);
1935         if (to == ci->i_truncate_size) {
1936                 ci->i_truncate_pending = 0;
1937                 finish = 1;
1938         }
1939         spin_unlock(&ci->i_ceph_lock);
1940         if (!finish)
1941                 goto retry;
1942
1943         mutex_unlock(&ci->i_truncate_mutex);
1944
1945         if (wrbuffer_refs == 0)
1946                 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
1947
1948         wake_up_all(&ci->i_cap_wq);
1949 }
1950
1951 static void ceph_inode_work(struct work_struct *work)
1952 {
1953         struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1954                                                  i_work);
1955         struct inode *inode = &ci->vfs_inode;
1956
1957         if (test_and_clear_bit(CEPH_I_WORK_WRITEBACK, &ci->i_work_mask)) {
1958                 dout("writeback %p\n", inode);
1959                 filemap_fdatawrite(&inode->i_data);
1960         }
1961         if (test_and_clear_bit(CEPH_I_WORK_INVALIDATE_PAGES, &ci->i_work_mask))
1962                 ceph_do_invalidate_pages(inode);
1963
1964         if (test_and_clear_bit(CEPH_I_WORK_VMTRUNCATE, &ci->i_work_mask))
1965                 __ceph_do_pending_vmtruncate(inode);
1966
1967         iput(inode);
1968 }
1969
1970 /*
1971  * symlinks
1972  */
1973 static const struct inode_operations ceph_symlink_iops = {
1974         .get_link = simple_get_link,
1975         .setattr = ceph_setattr,
1976         .getattr = ceph_getattr,
1977         .listxattr = ceph_listxattr,
1978 };
1979
1980 int __ceph_setattr(struct inode *inode, struct iattr *attr)
1981 {
1982         struct ceph_inode_info *ci = ceph_inode(inode);
1983         const unsigned int ia_valid = attr->ia_valid;
1984         struct ceph_mds_request *req;
1985         struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
1986         struct ceph_cap_flush *prealloc_cf;
1987         int issued;
1988         int release = 0, dirtied = 0;
1989         int mask = 0;
1990         int err = 0;
1991         int inode_dirty_flags = 0;
1992         bool lock_snap_rwsem = false;
1993
1994         prealloc_cf = ceph_alloc_cap_flush();
1995         if (!prealloc_cf)
1996                 return -ENOMEM;
1997
1998         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETATTR,
1999                                        USE_AUTH_MDS);
2000         if (IS_ERR(req)) {
2001                 ceph_free_cap_flush(prealloc_cf);
2002                 return PTR_ERR(req);
2003         }
2004
2005         spin_lock(&ci->i_ceph_lock);
2006         issued = __ceph_caps_issued(ci, NULL);
2007
2008         if (!ci->i_head_snapc &&
2009             (issued & (CEPH_CAP_ANY_EXCL | CEPH_CAP_FILE_WR))) {
2010                 lock_snap_rwsem = true;
2011                 if (!down_read_trylock(&mdsc->snap_rwsem)) {
2012                         spin_unlock(&ci->i_ceph_lock);
2013                         down_read(&mdsc->snap_rwsem);
2014                         spin_lock(&ci->i_ceph_lock);
2015                         issued = __ceph_caps_issued(ci, NULL);
2016                 }
2017         }
2018
2019         dout("setattr %p issued %s\n", inode, ceph_cap_string(issued));
2020
2021         if (ia_valid & ATTR_UID) {
2022                 dout("setattr %p uid %d -> %d\n", inode,
2023                      from_kuid(&init_user_ns, inode->i_uid),
2024                      from_kuid(&init_user_ns, attr->ia_uid));
2025                 if (issued & CEPH_CAP_AUTH_EXCL) {
2026                         inode->i_uid = attr->ia_uid;
2027                         dirtied |= CEPH_CAP_AUTH_EXCL;
2028                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
2029                            !uid_eq(attr->ia_uid, inode->i_uid)) {
2030                         req->r_args.setattr.uid = cpu_to_le32(
2031                                 from_kuid(&init_user_ns, attr->ia_uid));
2032                         mask |= CEPH_SETATTR_UID;
2033                         release |= CEPH_CAP_AUTH_SHARED;
2034                 }
2035         }
2036         if (ia_valid & ATTR_GID) {
2037                 dout("setattr %p gid %d -> %d\n", inode,
2038                      from_kgid(&init_user_ns, inode->i_gid),
2039                      from_kgid(&init_user_ns, attr->ia_gid));
2040                 if (issued & CEPH_CAP_AUTH_EXCL) {
2041                         inode->i_gid = attr->ia_gid;
2042                         dirtied |= CEPH_CAP_AUTH_EXCL;
2043                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
2044                            !gid_eq(attr->ia_gid, inode->i_gid)) {
2045                         req->r_args.setattr.gid = cpu_to_le32(
2046                                 from_kgid(&init_user_ns, attr->ia_gid));
2047                         mask |= CEPH_SETATTR_GID;
2048                         release |= CEPH_CAP_AUTH_SHARED;
2049                 }
2050         }
2051         if (ia_valid & ATTR_MODE) {
2052                 dout("setattr %p mode 0%o -> 0%o\n", inode, inode->i_mode,
2053                      attr->ia_mode);
2054                 if (issued & CEPH_CAP_AUTH_EXCL) {
2055                         inode->i_mode = attr->ia_mode;
2056                         dirtied |= CEPH_CAP_AUTH_EXCL;
2057                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
2058                            attr->ia_mode != inode->i_mode) {
2059                         inode->i_mode = attr->ia_mode;
2060                         req->r_args.setattr.mode = cpu_to_le32(attr->ia_mode);
2061                         mask |= CEPH_SETATTR_MODE;
2062                         release |= CEPH_CAP_AUTH_SHARED;
2063                 }
2064         }
2065
2066         if (ia_valid & ATTR_ATIME) {
2067                 dout("setattr %p atime %lld.%ld -> %lld.%ld\n", inode,
2068                      inode->i_atime.tv_sec, inode->i_atime.tv_nsec,
2069                      attr->ia_atime.tv_sec, attr->ia_atime.tv_nsec);
2070                 if (issued & CEPH_CAP_FILE_EXCL) {
2071                         ci->i_time_warp_seq++;
2072                         inode->i_atime = attr->ia_atime;
2073                         dirtied |= CEPH_CAP_FILE_EXCL;
2074                 } else if ((issued & CEPH_CAP_FILE_WR) &&
2075                            timespec64_compare(&inode->i_atime,
2076                                             &attr->ia_atime) < 0) {
2077                         inode->i_atime = attr->ia_atime;
2078                         dirtied |= CEPH_CAP_FILE_WR;
2079                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
2080                            !timespec64_equal(&inode->i_atime, &attr->ia_atime)) {
2081                         ceph_encode_timespec64(&req->r_args.setattr.atime,
2082                                                &attr->ia_atime);
2083                         mask |= CEPH_SETATTR_ATIME;
2084                         release |= CEPH_CAP_FILE_SHARED |
2085                                    CEPH_CAP_FILE_RD | CEPH_CAP_FILE_WR;
2086                 }
2087         }
2088         if (ia_valid & ATTR_MTIME) {
2089                 dout("setattr %p mtime %lld.%ld -> %lld.%ld\n", inode,
2090                      inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
2091                      attr->ia_mtime.tv_sec, attr->ia_mtime.tv_nsec);
2092                 if (issued & CEPH_CAP_FILE_EXCL) {
2093                         ci->i_time_warp_seq++;
2094                         inode->i_mtime = attr->ia_mtime;
2095                         dirtied |= CEPH_CAP_FILE_EXCL;
2096                 } else if ((issued & CEPH_CAP_FILE_WR) &&
2097                            timespec64_compare(&inode->i_mtime,
2098                                             &attr->ia_mtime) < 0) {
2099                         inode->i_mtime = attr->ia_mtime;
2100                         dirtied |= CEPH_CAP_FILE_WR;
2101                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
2102                            !timespec64_equal(&inode->i_mtime, &attr->ia_mtime)) {
2103                         ceph_encode_timespec64(&req->r_args.setattr.mtime,
2104                                                &attr->ia_mtime);
2105                         mask |= CEPH_SETATTR_MTIME;
2106                         release |= CEPH_CAP_FILE_SHARED |
2107                                    CEPH_CAP_FILE_RD | CEPH_CAP_FILE_WR;
2108                 }
2109         }
2110         if (ia_valid & ATTR_SIZE) {
2111                 dout("setattr %p size %lld -> %lld\n", inode,
2112                      inode->i_size, attr->ia_size);
2113                 if ((issued & CEPH_CAP_FILE_EXCL) &&
2114                     attr->ia_size > inode->i_size) {
2115                         i_size_write(inode, attr->ia_size);
2116                         inode->i_blocks = calc_inode_blocks(attr->ia_size);
2117                         ci->i_reported_size = attr->ia_size;
2118                         dirtied |= CEPH_CAP_FILE_EXCL;
2119                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
2120                            attr->ia_size != inode->i_size) {
2121                         req->r_args.setattr.size = cpu_to_le64(attr->ia_size);
2122                         req->r_args.setattr.old_size =
2123                                 cpu_to_le64(inode->i_size);
2124                         mask |= CEPH_SETATTR_SIZE;
2125                         release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_EXCL |
2126                                    CEPH_CAP_FILE_RD | CEPH_CAP_FILE_WR;
2127                 }
2128         }
2129
2130         /* these do nothing */
2131         if (ia_valid & ATTR_CTIME) {
2132                 bool only = (ia_valid & (ATTR_SIZE|ATTR_MTIME|ATTR_ATIME|
2133                                          ATTR_MODE|ATTR_UID|ATTR_GID)) == 0;
2134                 dout("setattr %p ctime %lld.%ld -> %lld.%ld (%s)\n", inode,
2135                      inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
2136                      attr->ia_ctime.tv_sec, attr->ia_ctime.tv_nsec,
2137                      only ? "ctime only" : "ignored");
2138                 if (only) {
2139                         /*
2140                          * if kernel wants to dirty ctime but nothing else,
2141                          * we need to choose a cap to dirty under, or do
2142                          * a almost-no-op setattr
2143                          */
2144                         if (issued & CEPH_CAP_AUTH_EXCL)
2145                                 dirtied |= CEPH_CAP_AUTH_EXCL;
2146                         else if (issued & CEPH_CAP_FILE_EXCL)
2147                                 dirtied |= CEPH_CAP_FILE_EXCL;
2148                         else if (issued & CEPH_CAP_XATTR_EXCL)
2149                                 dirtied |= CEPH_CAP_XATTR_EXCL;
2150                         else
2151                                 mask |= CEPH_SETATTR_CTIME;
2152                 }
2153         }
2154         if (ia_valid & ATTR_FILE)
2155                 dout("setattr %p ATTR_FILE ... hrm!\n", inode);
2156
2157         if (dirtied) {
2158                 inode_dirty_flags = __ceph_mark_dirty_caps(ci, dirtied,
2159                                                            &prealloc_cf);
2160                 inode->i_ctime = attr->ia_ctime;
2161         }
2162
2163         release &= issued;
2164         spin_unlock(&ci->i_ceph_lock);
2165         if (lock_snap_rwsem)
2166                 up_read(&mdsc->snap_rwsem);
2167
2168         if (inode_dirty_flags)
2169                 __mark_inode_dirty(inode, inode_dirty_flags);
2170
2171
2172         if (mask) {
2173                 req->r_inode = inode;
2174                 ihold(inode);
2175                 req->r_inode_drop = release;
2176                 req->r_args.setattr.mask = cpu_to_le32(mask);
2177                 req->r_num_caps = 1;
2178                 req->r_stamp = attr->ia_ctime;
2179                 err = ceph_mdsc_do_request(mdsc, NULL, req);
2180         }
2181         dout("setattr %p result=%d (%s locally, %d remote)\n", inode, err,
2182              ceph_cap_string(dirtied), mask);
2183
2184         ceph_mdsc_put_request(req);
2185         ceph_free_cap_flush(prealloc_cf);
2186
2187         if (err >= 0 && (mask & CEPH_SETATTR_SIZE))
2188                 __ceph_do_pending_vmtruncate(inode);
2189
2190         return err;
2191 }
2192
2193 /*
2194  * setattr
2195  */
2196 int ceph_setattr(struct dentry *dentry, struct iattr *attr)
2197 {
2198         struct inode *inode = d_inode(dentry);
2199         struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
2200         int err;
2201
2202         if (ceph_snap(inode) != CEPH_NOSNAP)
2203                 return -EROFS;
2204
2205         err = setattr_prepare(dentry, attr);
2206         if (err != 0)
2207                 return err;
2208
2209         if ((attr->ia_valid & ATTR_SIZE) &&
2210             attr->ia_size > max(inode->i_size, fsc->max_file_size))
2211                 return -EFBIG;
2212
2213         if ((attr->ia_valid & ATTR_SIZE) &&
2214             ceph_quota_is_max_bytes_exceeded(inode, attr->ia_size))
2215                 return -EDQUOT;
2216
2217         err = __ceph_setattr(inode, attr);
2218
2219         if (err >= 0 && (attr->ia_valid & ATTR_MODE))
2220                 err = posix_acl_chmod(inode, attr->ia_mode);
2221
2222         return err;
2223 }
2224
2225 /*
2226  * Verify that we have a lease on the given mask.  If not,
2227  * do a getattr against an mds.
2228  */
2229 int __ceph_do_getattr(struct inode *inode, struct page *locked_page,
2230                       int mask, bool force)
2231 {
2232         struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
2233         struct ceph_mds_client *mdsc = fsc->mdsc;
2234         struct ceph_mds_request *req;
2235         int mode;
2236         int err;
2237
2238         if (ceph_snap(inode) == CEPH_SNAPDIR) {
2239                 dout("do_getattr inode %p SNAPDIR\n", inode);
2240                 return 0;
2241         }
2242
2243         dout("do_getattr inode %p mask %s mode 0%o\n",
2244              inode, ceph_cap_string(mask), inode->i_mode);
2245         if (!force && ceph_caps_issued_mask(ceph_inode(inode), mask, 1))
2246                 return 0;
2247
2248         mode = (mask & CEPH_STAT_RSTAT) ? USE_AUTH_MDS : USE_ANY_MDS;
2249         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, mode);
2250         if (IS_ERR(req))
2251                 return PTR_ERR(req);
2252         req->r_inode = inode;
2253         ihold(inode);
2254         req->r_num_caps = 1;
2255         req->r_args.getattr.mask = cpu_to_le32(mask);
2256         req->r_locked_page = locked_page;
2257         err = ceph_mdsc_do_request(mdsc, NULL, req);
2258         if (locked_page && err == 0) {
2259                 u64 inline_version = req->r_reply_info.targeti.inline_version;
2260                 if (inline_version == 0) {
2261                         /* the reply is supposed to contain inline data */
2262                         err = -EINVAL;
2263                 } else if (inline_version == CEPH_INLINE_NONE) {
2264                         err = -ENODATA;
2265                 } else {
2266                         err = req->r_reply_info.targeti.inline_len;
2267                 }
2268         }
2269         ceph_mdsc_put_request(req);
2270         dout("do_getattr result=%d\n", err);
2271         return err;
2272 }
2273
2274
2275 /*
2276  * Check inode permissions.  We verify we have a valid value for
2277  * the AUTH cap, then call the generic handler.
2278  */
2279 int ceph_permission(struct inode *inode, int mask)
2280 {
2281         int err;
2282
2283         if (mask & MAY_NOT_BLOCK)
2284                 return -ECHILD;
2285
2286         err = ceph_do_getattr(inode, CEPH_CAP_AUTH_SHARED, false);
2287
2288         if (!err)
2289                 err = generic_permission(inode, mask);
2290         return err;
2291 }
2292
2293 /* Craft a mask of needed caps given a set of requested statx attrs. */
2294 static int statx_to_caps(u32 want)
2295 {
2296         int mask = 0;
2297
2298         if (want & (STATX_MODE|STATX_UID|STATX_GID|STATX_CTIME))
2299                 mask |= CEPH_CAP_AUTH_SHARED;
2300
2301         if (want & (STATX_NLINK|STATX_CTIME))
2302                 mask |= CEPH_CAP_LINK_SHARED;
2303
2304         if (want & (STATX_ATIME|STATX_MTIME|STATX_CTIME|STATX_SIZE|
2305                     STATX_BLOCKS))
2306                 mask |= CEPH_CAP_FILE_SHARED;
2307
2308         if (want & (STATX_CTIME))
2309                 mask |= CEPH_CAP_XATTR_SHARED;
2310
2311         return mask;
2312 }
2313
2314 /*
2315  * Get all the attributes. If we have sufficient caps for the requested attrs,
2316  * then we can avoid talking to the MDS at all.
2317  */
2318 int ceph_getattr(const struct path *path, struct kstat *stat,
2319                  u32 request_mask, unsigned int flags)
2320 {
2321         struct inode *inode = d_inode(path->dentry);
2322         struct ceph_inode_info *ci = ceph_inode(inode);
2323         int err = 0;
2324
2325         /* Skip the getattr altogether if we're asked not to sync */
2326         if (!(flags & AT_STATX_DONT_SYNC)) {
2327                 err = ceph_do_getattr(inode, statx_to_caps(request_mask),
2328                                       flags & AT_STATX_FORCE_SYNC);
2329                 if (err)
2330                         return err;
2331         }
2332
2333         generic_fillattr(inode, stat);
2334         stat->ino = ceph_translate_ino(inode->i_sb, inode->i_ino);
2335         if (ceph_snap(inode) == CEPH_NOSNAP)
2336                 stat->dev = inode->i_sb->s_dev;
2337         else
2338                 stat->dev = ci->i_snapid_map ? ci->i_snapid_map->dev : 0;
2339
2340         if (S_ISDIR(inode->i_mode)) {
2341                 if (ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb),
2342                                         RBYTES))
2343                         stat->size = ci->i_rbytes;
2344                 else
2345                         stat->size = ci->i_files + ci->i_subdirs;
2346                 stat->blocks = 0;
2347                 stat->blksize = 65536;
2348                 /*
2349                  * Some applications rely on the number of st_nlink
2350                  * value on directories to be either 0 (if unlinked)
2351                  * or 2 + number of subdirectories.
2352                  */
2353                 if (stat->nlink == 1)
2354                         /* '.' + '..' + subdirs */
2355                         stat->nlink = 1 + 1 + ci->i_subdirs;
2356         }
2357
2358         /* Mask off any higher bits (e.g. btime) until we have support */
2359         stat->result_mask = request_mask & STATX_BASIC_STATS;
2360         return err;
2361 }