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         memset(&ci->i_btime, '\0', sizeof(ci->i_btime));
 513
 514         ceph_fscache_inode_init(ci);
 515
 516         return &ci->vfs_inode;
 517 }
 518
 519 void ceph_free_inode(struct inode *inode)
 520 {
 521         struct ceph_inode_info *ci = ceph_inode(inode);
 522
 523         kfree(ci->i_symlink);
 524         kmem_cache_free(ceph_inode_cachep, ci);
 525 }
 526
 527 void ceph_destroy_inode(struct inode *inode)
 528 {
 529         struct ceph_inode_info *ci = ceph_inode(inode);
 530         struct ceph_inode_frag *frag;
 531         struct rb_node *n;
 532
 533         dout("destroy_inode %p ino %llx.%llx\n", inode, ceph_vinop(inode));
 534
 535         ceph_fscache_unregister_inode_cookie(ci);
 536
 537         __ceph_remove_caps(ci);
 538
 539         if (__ceph_has_any_quota(ci))
 540                 ceph_adjust_quota_realms_count(inode, false);
 541
 542         /*
 543          * we may still have a snap_realm reference if there are stray
 544          * caps in i_snap_caps.
 545          */
 546         if (ci->i_snap_realm) {
 547                 struct ceph_mds_client *mdsc =
 548                                         ceph_inode_to_client(inode)->mdsc;
 549                 if (ceph_snap(inode) == CEPH_NOSNAP) {
 550                         struct ceph_snap_realm *realm = ci->i_snap_realm;
 551                         dout(" dropping residual ref to snap realm %p\n",
 552                              realm);
 553                         spin_lock(&realm->inodes_with_caps_lock);
 554                         list_del_init(&ci->i_snap_realm_item);
 555                         ci->i_snap_realm = NULL;
 556                         if (realm->ino == ci->i_vino.ino)
 557                                 realm->inode = NULL;
 558                         spin_unlock(&realm->inodes_with_caps_lock);
 559                         ceph_put_snap_realm(mdsc, realm);
 560                 } else {
 561                         ceph_put_snapid_map(mdsc, ci->i_snapid_map);
 562                         ci->i_snap_realm = NULL;
 563                 }
 564         }
 565
 566         while ((n = rb_first(&ci->i_fragtree)) != NULL) {
 567                 frag = rb_entry(n, struct ceph_inode_frag, node);
 568                 rb_erase(n, &ci->i_fragtree);
 569                 kfree(frag);
 570         }
 571         ci->i_fragtree_nsplits = 0;
 572
 573         __ceph_destroy_xattrs(ci);
 574         if (ci->i_xattrs.blob)
 575                 ceph_buffer_put(ci->i_xattrs.blob);
 576         if (ci->i_xattrs.prealloc_blob)
 577                 ceph_buffer_put(ci->i_xattrs.prealloc_blob);
 578
 579         ceph_put_string(rcu_dereference_raw(ci->i_layout.pool_ns));
 580 }
 581
 582 int ceph_drop_inode(struct inode *inode)
 583 {
 584         /*
 585          * Positve dentry and corresponding inode are always accompanied
 586          * in MDS reply. So no need to keep inode in the cache after
 587          * dropping all its aliases.
 588          */
 589         return 1;
 590 }
 591
 592 static inline blkcnt_t calc_inode_blocks(u64 size)
 593 {
 594         return (size + (1<<9) - 1) >> 9;
 595 }
 596
 597 /*
 598  * Helpers to fill in size, ctime, mtime, and atime.  We have to be
 599  * careful because either the client or MDS may have more up to date
 600  * info, depending on which capabilities are held, and whether
 601  * time_warp_seq or truncate_seq have increased.  (Ordinarily, mtime
 602  * and size are monotonically increasing, except when utimes() or
 603  * truncate() increments the corresponding _seq values.)
 604  */
 605 int ceph_fill_file_size(struct inode *inode, int issued,
 606                         u32 truncate_seq, u64 truncate_size, u64 size)
 607 {
 608         struct ceph_inode_info *ci = ceph_inode(inode);
 609         int queue_trunc = 0;
 610
 611         if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) > 0 ||
 612             (truncate_seq == ci->i_truncate_seq && size > inode->i_size)) {
 613                 dout("size %lld -> %llu\n", inode->i_size, size);
 614                 if (size > 0 && S_ISDIR(inode->i_mode)) {
 615                         pr_err("fill_file_size non-zero size for directory\n");
 616                         size = 0;
 617                 }
 618                 i_size_write(inode, size);
 619                 inode->i_blocks = calc_inode_blocks(size);
 620                 ci->i_reported_size = size;
 621                 if (truncate_seq != ci->i_truncate_seq) {
 622                         dout("truncate_seq %u -> %u\n",
 623                              ci->i_truncate_seq, truncate_seq);
 624                         ci->i_truncate_seq = truncate_seq;
 625
 626                         /* the MDS should have revoked these caps */
 627                         WARN_ON_ONCE(issued & (CEPH_CAP_FILE_EXCL |
 628                                                CEPH_CAP_FILE_RD |
 629                                                CEPH_CAP_FILE_WR |
 630                                                CEPH_CAP_FILE_LAZYIO));
 631                         /*
 632                          * If we hold relevant caps, or in the case where we're
 633                          * not the only client referencing this file and we
 634                          * don't hold those caps, then we need to check whether
 635                          * the file is either opened or mmaped
 636                          */
 637                         if ((issued & (CEPH_CAP_FILE_CACHE|
 638                                        CEPH_CAP_FILE_BUFFER)) ||
 639                             mapping_mapped(inode->i_mapping) ||
 640                             __ceph_caps_file_wanted(ci)) {
 641                                 ci->i_truncate_pending++;
 642                                 queue_trunc = 1;
 643                         }
 644                 }
 645         }
 646         if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) >= 0 &&
 647             ci->i_truncate_size != truncate_size) {
 648                 dout("truncate_size %lld -> %llu\n", ci->i_truncate_size,
 649                      truncate_size);
 650                 ci->i_truncate_size = truncate_size;
 651         }
 652
 653         if (queue_trunc)
 654                 ceph_fscache_invalidate(inode);
 655
 656         return queue_trunc;
 657 }
 658
 659 void ceph_fill_file_time(struct inode *inode, int issued,
 660                          u64 time_warp_seq, struct timespec64 *ctime,
 661                          struct timespec64 *mtime, struct timespec64 *atime)
 662 {
 663         struct ceph_inode_info *ci = ceph_inode(inode);
 664         int warn = 0;
 665
 666         if (issued & (CEPH_CAP_FILE_EXCL|
 667                       CEPH_CAP_FILE_WR|
 668                       CEPH_CAP_FILE_BUFFER|
 669                       CEPH_CAP_AUTH_EXCL|
 670                       CEPH_CAP_XATTR_EXCL)) {
 671                 if (ci->i_version == 0 ||
 672                     timespec64_compare(ctime, &inode->i_ctime) > 0) {
 673                         dout("ctime %lld.%09ld -> %lld.%09ld inc w/ cap\n",
 674                              inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
 675                              ctime->tv_sec, ctime->tv_nsec);
 676                         inode->i_ctime = *ctime;
 677                 }
 678                 if (ci->i_version == 0 ||
 679                     ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) > 0) {
 680                         /* the MDS did a utimes() */
 681                         dout("mtime %lld.%09ld -> %lld.%09ld "
 682                              "tw %d -> %d\n",
 683                              inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
 684                              mtime->tv_sec, mtime->tv_nsec,
 685                              ci->i_time_warp_seq, (int)time_warp_seq);
 686
 687                         inode->i_mtime = *mtime;
 688                         inode->i_atime = *atime;
 689                         ci->i_time_warp_seq = time_warp_seq;
 690                 } else if (time_warp_seq == ci->i_time_warp_seq) {
 691                         /* nobody did utimes(); take the max */
 692                         if (timespec64_compare(mtime, &inode->i_mtime) > 0) {
 693                                 dout("mtime %lld.%09ld -> %lld.%09ld inc\n",
 694                                      inode->i_mtime.tv_sec,
 695                                      inode->i_mtime.tv_nsec,
 696                                      mtime->tv_sec, mtime->tv_nsec);
 697                                 inode->i_mtime = *mtime;
 698                         }
 699                         if (timespec64_compare(atime, &inode->i_atime) > 0) {
 700                                 dout("atime %lld.%09ld -> %lld.%09ld inc\n",
 701                                      inode->i_atime.tv_sec,
 702                                      inode->i_atime.tv_nsec,
 703                                      atime->tv_sec, atime->tv_nsec);
 704                                 inode->i_atime = *atime;
 705                         }
 706                 } else if (issued & CEPH_CAP_FILE_EXCL) {
 707                         /* we did a utimes(); ignore mds values */
 708                 } else {
 709                         warn = 1;
 710                 }
 711         } else {
 712                 /* we have no write|excl caps; whatever the MDS says is true */
 713                 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) >= 0) {
 714                         inode->i_ctime = *ctime;
 715                         inode->i_mtime = *mtime;
 716                         inode->i_atime = *atime;
 717                         ci->i_time_warp_seq = time_warp_seq;
 718                 } else {
 719                         warn = 1;
 720                 }
 721         }
 722         if (warn) /* time_warp_seq shouldn't go backwards */
 723                 dout("%p mds time_warp_seq %llu < %u\n",
 724                      inode, time_warp_seq, ci->i_time_warp_seq);
 725 }
 726
 727 /*
 728  * Populate an inode based on info from mds.  May be called on new or
 729  * existing inodes.
 730  */
 731 static int fill_inode(struct inode *inode, struct page *locked_page,
 732                       struct ceph_mds_reply_info_in *iinfo,
 733                       struct ceph_mds_reply_dirfrag *dirinfo,
 734                       struct ceph_mds_session *session,
 735                       unsigned long ttl_from, int cap_fmode,
 736                       struct ceph_cap_reservation *caps_reservation)
 737 {
 738         struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
 739         struct ceph_mds_reply_inode *info = iinfo->in;
 740         struct ceph_inode_info *ci = ceph_inode(inode);
 741         int issued, new_issued, info_caps;
 742         struct timespec64 mtime, atime, ctime;
 743         struct ceph_buffer *xattr_blob = NULL;
 744         struct ceph_string *pool_ns = NULL;
 745         struct ceph_cap *new_cap = NULL;
 746         int err = 0;
 747         bool wake = false;
 748         bool queue_trunc = false;
 749         bool new_version = false;
 750         bool fill_inline = false;
 751
 752         dout("fill_inode %p ino %llx.%llx v %llu had %llu\n",
 753              inode, ceph_vinop(inode), le64_to_cpu(info->version),
 754              ci->i_version);
 755
 756         info_caps = le32_to_cpu(info->cap.caps);
 757
 758         /* prealloc new cap struct */
 759         if (info_caps && ceph_snap(inode) == CEPH_NOSNAP)
 760                 new_cap = ceph_get_cap(mdsc, caps_reservation);
 761
 762         /*
 763          * prealloc xattr data, if it looks like we'll need it.  only
 764          * if len > 4 (meaning there are actually xattrs; the first 4
 765          * bytes are the xattr count).
 766          */
 767         if (iinfo->xattr_len > 4) {
 768                 xattr_blob = ceph_buffer_new(iinfo->xattr_len, GFP_NOFS);
 769                 if (!xattr_blob)
 770                         pr_err("fill_inode ENOMEM xattr blob %d bytes\n",
 771                                iinfo->xattr_len);
 772         }
 773
 774         if (iinfo->pool_ns_len > 0)
 775                 pool_ns = ceph_find_or_create_string(iinfo->pool_ns_data,
 776                                                      iinfo->pool_ns_len);
 777
 778         if (ceph_snap(inode) != CEPH_NOSNAP && !ci->i_snapid_map)
 779                 ci->i_snapid_map = ceph_get_snapid_map(mdsc, ceph_snap(inode));
 780
 781         spin_lock(&ci->i_ceph_lock);
 782
 783         /*
 784          * provided version will be odd if inode value is projected,
 785          * even if stable.  skip the update if we have newer stable
 786          * info (ours>=theirs, e.g. due to racing mds replies), unless
 787          * we are getting projected (unstable) info (in which case the
 788          * version is odd, and we want ours>theirs).
 789          *   us   them
 790          *   2    2     skip
 791          *   3    2     skip
 792          *   3    3     update
 793          */
 794         if (ci->i_version == 0 ||
 795             ((info->cap.flags & CEPH_CAP_FLAG_AUTH) &&
 796              le64_to_cpu(info->version) > (ci->i_version & ~1)))
 797                 new_version = true;
 798
 799         __ceph_caps_issued(ci, &issued);
 800         issued |= __ceph_caps_dirty(ci);
 801         new_issued = ~issued & info_caps;
 802
 803         /* update inode */
 804         inode->i_rdev = le32_to_cpu(info->rdev);
 805         inode->i_blkbits = fls(le32_to_cpu(info->layout.fl_stripe_unit)) - 1;
 806
 807         __ceph_update_quota(ci, iinfo->max_bytes, iinfo->max_files);
 808
 809         if ((new_version || (new_issued & CEPH_CAP_AUTH_SHARED)) &&
 810             (issued & CEPH_CAP_AUTH_EXCL) == 0) {
 811                 inode->i_mode = le32_to_cpu(info->mode);
 812                 inode->i_uid = make_kuid(&init_user_ns, le32_to_cpu(info->uid));
 813                 inode->i_gid = make_kgid(&init_user_ns, le32_to_cpu(info->gid));
 814                 dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode,
 815                      from_kuid(&init_user_ns, inode->i_uid),
 816                      from_kgid(&init_user_ns, inode->i_gid));
 817                 ceph_decode_timespec64(&ci->i_btime, &iinfo->btime);
 818                 ceph_decode_timespec64(&ci->i_snap_btime, &iinfo->snap_btime);
 819         }
 820
 821         if ((new_version || (new_issued & CEPH_CAP_LINK_SHARED)) &&
 822             (issued & CEPH_CAP_LINK_EXCL) == 0)
 823                 set_nlink(inode, le32_to_cpu(info->nlink));
 824
 825         if (new_version || (new_issued & CEPH_CAP_ANY_RD)) {
 826                 /* be careful with mtime, atime, size */
 827                 ceph_decode_timespec64(&atime, &info->atime);
 828                 ceph_decode_timespec64(&mtime, &info->mtime);
 829                 ceph_decode_timespec64(&ctime, &info->ctime);
 830                 ceph_fill_file_time(inode, issued,
 831                                 le32_to_cpu(info->time_warp_seq),
 832                                 &ctime, &mtime, &atime);
 833         }
 834
 835         if (new_version || (info_caps & CEPH_CAP_FILE_SHARED)) {
 836                 ci->i_files = le64_to_cpu(info->files);
 837                 ci->i_subdirs = le64_to_cpu(info->subdirs);
 838         }
 839
 840         if (new_version ||
 841             (new_issued & (CEPH_CAP_ANY_FILE_RD | CEPH_CAP_ANY_FILE_WR))) {
 842                 s64 old_pool = ci->i_layout.pool_id;
 843                 struct ceph_string *old_ns;
 844
 845                 ceph_file_layout_from_legacy(&ci->i_layout, &info->layout);
 846                 old_ns = rcu_dereference_protected(ci->i_layout.pool_ns,
 847                                         lockdep_is_held(&ci->i_ceph_lock));
 848                 rcu_assign_pointer(ci->i_layout.pool_ns, pool_ns);
 849
 850                 if (ci->i_layout.pool_id != old_pool || pool_ns != old_ns)
 851                         ci->i_ceph_flags &= ~CEPH_I_POOL_PERM;
 852
 853                 pool_ns = old_ns;
 854
 855                 queue_trunc = ceph_fill_file_size(inode, issued,
 856                                         le32_to_cpu(info->truncate_seq),
 857                                         le64_to_cpu(info->truncate_size),
 858                                         le64_to_cpu(info->size));
 859                 /* only update max_size on auth cap */
 860                 if ((info->cap.flags & CEPH_CAP_FLAG_AUTH) &&
 861                     ci->i_max_size != le64_to_cpu(info->max_size)) {
 862                         dout("max_size %lld -> %llu\n", ci->i_max_size,
 863                                         le64_to_cpu(info->max_size));
 864                         ci->i_max_size = le64_to_cpu(info->max_size);
 865                 }
 866         }
 867
 868         /* layout and rstat are not tracked by capability, update them if
 869          * the inode info is from auth mds */
 870         if (new_version || (info->cap.flags & CEPH_CAP_FLAG_AUTH)) {
 871                 if (S_ISDIR(inode->i_mode)) {
 872                         ci->i_dir_layout = iinfo->dir_layout;
 873                         ci->i_rbytes = le64_to_cpu(info->rbytes);
 874                         ci->i_rfiles = le64_to_cpu(info->rfiles);
 875                         ci->i_rsubdirs = le64_to_cpu(info->rsubdirs);
 876                         ci->i_dir_pin = iinfo->dir_pin;
 877                         ceph_decode_timespec64(&ci->i_rctime, &info->rctime);
 878                 }
 879         }
 880
 881         /* xattrs */
 882         /* note that if i_xattrs.len <= 4, i_xattrs.data will still be NULL. */
 883         if ((ci->i_xattrs.version == 0 || !(issued & CEPH_CAP_XATTR_EXCL))  &&
 884             le64_to_cpu(info->xattr_version) > ci->i_xattrs.version) {
 885                 if (ci->i_xattrs.blob)
 886                         ceph_buffer_put(ci->i_xattrs.blob);
 887                 ci->i_xattrs.blob = xattr_blob;
 888                 if (xattr_blob)
 889                         memcpy(ci->i_xattrs.blob->vec.iov_base,
 890                                iinfo->xattr_data, iinfo->xattr_len);
 891                 ci->i_xattrs.version = le64_to_cpu(info->xattr_version);
 892                 ceph_forget_all_cached_acls(inode);
 893                 ceph_security_invalidate_secctx(inode);
 894                 xattr_blob = NULL;
 895         }
 896
 897         /* finally update i_version */
 898         if (le64_to_cpu(info->version) > ci->i_version)
 899                 ci->i_version = le64_to_cpu(info->version);
 900
 901         inode->i_mapping->a_ops = &ceph_aops;
 902
 903         switch (inode->i_mode & S_IFMT) {
 904         case S_IFIFO:
 905         case S_IFBLK:
 906         case S_IFCHR:
 907         case S_IFSOCK:
 908                 inode->i_blkbits = PAGE_SHIFT;
 909                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
 910                 inode->i_op = &ceph_file_iops;
 911                 break;
 912         case S_IFREG:
 913                 inode->i_op = &ceph_file_iops;
 914                 inode->i_fop = &ceph_file_fops;
 915                 break;
 916         case S_IFLNK:
 917                 inode->i_op = &ceph_symlink_iops;
 918                 if (!ci->i_symlink) {
 919                         u32 symlen = iinfo->symlink_len;
 920                         char *sym;
 921
 922                         spin_unlock(&ci->i_ceph_lock);
 923
 924                         if (symlen != i_size_read(inode)) {
 925                                 pr_err("fill_inode %llx.%llx BAD symlink "
 926                                         "size %lld\n", ceph_vinop(inode),
 927                                         i_size_read(inode));
 928                                 i_size_write(inode, symlen);
 929                                 inode->i_blocks = calc_inode_blocks(symlen);
 930                         }
 931
 932                         err = -ENOMEM;
 933                         sym = kstrndup(iinfo->symlink, symlen, GFP_NOFS);
 934                         if (!sym)
 935                                 goto out;
 936
 937                         spin_lock(&ci->i_ceph_lock);
 938                         if (!ci->i_symlink)
 939                                 ci->i_symlink = sym;
 940                         else
 941                                 kfree(sym); /* lost a race */
 942                 }
 943                 inode->i_link = ci->i_symlink;
 944                 break;
 945         case S_IFDIR:
 946                 inode->i_op = &ceph_dir_iops;
 947                 inode->i_fop = &ceph_dir_fops;
 948                 break;
 949         default:
 950                 pr_err("fill_inode %llx.%llx BAD mode 0%o\n",
 951                        ceph_vinop(inode), inode->i_mode);
 952         }
 953
 954         /* were we issued a capability? */
 955         if (info_caps) {
 956                 if (ceph_snap(inode) == CEPH_NOSNAP) {
 957                         ceph_add_cap(inode, session,
 958                                      le64_to_cpu(info->cap.cap_id),
 959                                      cap_fmode, info_caps,
 960                                      le32_to_cpu(info->cap.wanted),
 961                                      le32_to_cpu(info->cap.seq),
 962                                      le32_to_cpu(info->cap.mseq),
 963                                      le64_to_cpu(info->cap.realm),
 964                                      info->cap.flags, &new_cap);
 965
 966                         /* set dir completion flag? */
 967                         if (S_ISDIR(inode->i_mode) &&
 968                             ci->i_files == 0 && ci->i_subdirs == 0 &&
 969                             (info_caps & CEPH_CAP_FILE_SHARED) &&
 970                             (issued & CEPH_CAP_FILE_EXCL) == 0 &&
 971                             !__ceph_dir_is_complete(ci)) {
 972                                 dout(" marking %p complete (empty)\n", inode);
 973                                 i_size_write(inode, 0);
 974                                 __ceph_dir_set_complete(ci,
 975                                         atomic64_read(&ci->i_release_count),
 976                                         atomic64_read(&ci->i_ordered_count));
 977                         }
 978
 979                         wake = true;
 980                 } else {
 981                         dout(" %p got snap_caps %s\n", inode,
 982                              ceph_cap_string(info_caps));
 983                         ci->i_snap_caps |= info_caps;
 984                         if (cap_fmode >= 0)
 985                                 __ceph_get_fmode(ci, cap_fmode);
 986                 }
 987         } else if (cap_fmode >= 0) {
 988                 pr_warn("mds issued no caps on %llx.%llx\n",
 989                            ceph_vinop(inode));
 990                 __ceph_get_fmode(ci, cap_fmode);
 991         }
 992
 993         if (iinfo->inline_version > 0 &&
 994             iinfo->inline_version >= ci->i_inline_version) {
 995                 int cache_caps = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO;
 996                 ci->i_inline_version = iinfo->inline_version;
 997                 if (ci->i_inline_version != CEPH_INLINE_NONE &&
 998                     (locked_page || (info_caps & cache_caps)))
 999                         fill_inline = true;
1000         }
1001
1002         spin_unlock(&ci->i_ceph_lock);
1003
1004         if (fill_inline)
1005                 ceph_fill_inline_data(inode, locked_page,
1006                                       iinfo->inline_data, iinfo->inline_len);
1007
1008         if (wake)
1009                 wake_up_all(&ci->i_cap_wq);
1010
1011         /* queue truncate if we saw i_size decrease */
1012         if (queue_trunc)
1013                 ceph_queue_vmtruncate(inode);
1014
1015         /* populate frag tree */
1016         if (S_ISDIR(inode->i_mode))
1017                 ceph_fill_fragtree(inode, &info->fragtree, dirinfo);
1018
1019         /* update delegation info? */
1020         if (dirinfo)
1021                 ceph_fill_dirfrag(inode, dirinfo);
1022
1023         err = 0;
1024 out:
1025         if (new_cap)
1026                 ceph_put_cap(mdsc, new_cap);
1027         if (xattr_blob)
1028                 ceph_buffer_put(xattr_blob);
1029         ceph_put_string(pool_ns);
1030         return err;
1031 }
1032
1033 /*
1034  * caller should hold session s_mutex and dentry->d_lock.
1035  */
1036 static void __update_dentry_lease(struct inode *dir, struct dentry *dentry,
1037                                   struct ceph_mds_reply_lease *lease,
1038                                   struct ceph_mds_session *session,
1039                                   unsigned long from_time,
1040                                   struct ceph_mds_session **old_lease_session)
1041 {
1042         struct ceph_dentry_info *di = ceph_dentry(dentry);
1043         long unsigned duration = le32_to_cpu(lease->duration_ms);
1044         long unsigned ttl = from_time + (duration * HZ) / 1000;
1045         long unsigned half_ttl = from_time + (duration * HZ / 2) / 1000;
1046
1047         dout("update_dentry_lease %p duration %lu ms ttl %lu\n",
1048              dentry, duration, ttl);
1049
1050         /* only track leases on regular dentries */
1051         if (ceph_snap(dir) != CEPH_NOSNAP)
1052                 return;
1053
1054         di->lease_shared_gen = atomic_read(&ceph_inode(dir)->i_shared_gen);
1055         if (duration == 0) {
1056                 __ceph_dentry_dir_lease_touch(di);
1057                 return;
1058         }
1059
1060         if (di->lease_gen == session->s_cap_gen &&
1061             time_before(ttl, di->time))
1062                 return;  /* we already have a newer lease. */
1063
1064         if (di->lease_session && di->lease_session != session) {
1065                 *old_lease_session = di->lease_session;
1066                 di->lease_session = NULL;
1067         }
1068
1069         if (!di->lease_session)
1070                 di->lease_session = ceph_get_mds_session(session);
1071         di->lease_gen = session->s_cap_gen;
1072         di->lease_seq = le32_to_cpu(lease->seq);
1073         di->lease_renew_after = half_ttl;
1074         di->lease_renew_from = 0;
1075         di->time = ttl;
1076
1077         __ceph_dentry_lease_touch(di);
1078 }
1079
1080 static inline void update_dentry_lease(struct inode *dir, struct dentry *dentry,
1081                                         struct ceph_mds_reply_lease *lease,
1082                                         struct ceph_mds_session *session,
1083                                         unsigned long from_time)
1084 {
1085         struct ceph_mds_session *old_lease_session = NULL;
1086         spin_lock(&dentry->d_lock);
1087         __update_dentry_lease(dir, dentry, lease, session, from_time,
1088                               &old_lease_session);
1089         spin_unlock(&dentry->d_lock);
1090         if (old_lease_session)
1091                 ceph_put_mds_session(old_lease_session);
1092 }
1093
1094 /*
1095  * update dentry lease without having parent inode locked
1096  */
1097 static void update_dentry_lease_careful(struct dentry *dentry,
1098                                         struct ceph_mds_reply_lease *lease,
1099                                         struct ceph_mds_session *session,
1100                                         unsigned long from_time,
1101                                         char *dname, u32 dname_len,
1102                                         struct ceph_vino *pdvino,
1103                                         struct ceph_vino *ptvino)
1104
1105 {
1106         struct inode *dir;
1107         struct ceph_mds_session *old_lease_session = NULL;
1108
1109         spin_lock(&dentry->d_lock);
1110         /* make sure dentry's name matches target */
1111         if (dentry->d_name.len != dname_len ||
1112             memcmp(dentry->d_name.name, dname, dname_len))
1113                 goto out_unlock;
1114
1115         dir = d_inode(dentry->d_parent);
1116         /* make sure parent matches dvino */
1117         if (!ceph_ino_compare(dir, pdvino))
1118                 goto out_unlock;
1119
1120         /* make sure dentry's inode matches target. NULL ptvino means that
1121          * we expect a negative dentry */
1122         if (ptvino) {
1123                 if (d_really_is_negative(dentry))
1124                         goto out_unlock;
1125                 if (!ceph_ino_compare(d_inode(dentry), ptvino))
1126                         goto out_unlock;
1127         } else {
1128                 if (d_really_is_positive(dentry))
1129                         goto out_unlock;
1130         }
1131
1132         __update_dentry_lease(dir, dentry, lease, session,
1133                               from_time, &old_lease_session);
1134 out_unlock:
1135         spin_unlock(&dentry->d_lock);
1136         if (old_lease_session)
1137                 ceph_put_mds_session(old_lease_session);
1138 }
1139
1140 /*
1141  * splice a dentry to an inode.
1142  * caller must hold directory i_mutex for this to be safe.
1143  */
1144 static int splice_dentry(struct dentry **pdn, struct inode *in)
1145 {
1146         struct dentry *dn = *pdn;
1147         struct dentry *realdn;
1148
1149         BUG_ON(d_inode(dn));
1150
1151         if (S_ISDIR(in->i_mode)) {
1152                 /* If inode is directory, d_splice_alias() below will remove
1153                  * 'realdn' from its origin parent. We need to ensure that
1154                  * origin parent's readdir cache will not reference 'realdn'
1155                  */
1156                 realdn = d_find_any_alias(in);
1157                 if (realdn) {
1158                         struct ceph_dentry_info *di = ceph_dentry(realdn);
1159                         spin_lock(&realdn->d_lock);
1160
1161                         realdn->d_op->d_prune(realdn);
1162
1163                         di->time = jiffies;
1164                         di->lease_shared_gen = 0;
1165                         di->offset = 0;
1166
1167                         spin_unlock(&realdn->d_lock);
1168                         dput(realdn);
1169                 }
1170         }
1171
1172         /* dn must be unhashed */
1173         if (!d_unhashed(dn))
1174                 d_drop(dn);
1175         realdn = d_splice_alias(in, dn);
1176         if (IS_ERR(realdn)) {
1177                 pr_err("splice_dentry error %ld %p inode %p ino %llx.%llx\n",
1178                        PTR_ERR(realdn), dn, in, ceph_vinop(in));
1179                 return PTR_ERR(realdn);
1180         }
1181
1182         if (realdn) {
1183                 dout("dn %p (%d) spliced with %p (%d) "
1184                      "inode %p ino %llx.%llx\n",
1185                      dn, d_count(dn),
1186                      realdn, d_count(realdn),
1187                      d_inode(realdn), ceph_vinop(d_inode(realdn)));
1188                 dput(dn);
1189                 *pdn = realdn;
1190         } else {
1191                 BUG_ON(!ceph_dentry(dn));
1192                 dout("dn %p attached to %p ino %llx.%llx\n",
1193                      dn, d_inode(dn), ceph_vinop(d_inode(dn)));
1194         }
1195         return 0;
1196 }
1197
1198 /*
1199  * Incorporate results into the local cache.  This is either just
1200  * one inode, or a directory, dentry, and possibly linked-to inode (e.g.,
1201  * after a lookup).
1202  *
1203  * A reply may contain
1204  *         a directory inode along with a dentry.
1205  *  and/or a target inode
1206  *
1207  * Called with snap_rwsem (read).
1208  */
1209 int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req)
1210 {
1211         struct ceph_mds_session *session = req->r_session;
1212         struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1213         struct inode *in = NULL;
1214         struct ceph_vino tvino, dvino;
1215         struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
1216         int err = 0;
1217
1218         dout("fill_trace %p is_dentry %d is_target %d\n", req,
1219              rinfo->head->is_dentry, rinfo->head->is_target);
1220
1221         if (!rinfo->head->is_target && !rinfo->head->is_dentry) {
1222                 dout("fill_trace reply is empty!\n");
1223                 if (rinfo->head->result == 0 && req->r_parent)
1224                         ceph_invalidate_dir_request(req);
1225                 return 0;
1226         }
1227
1228         if (rinfo->head->is_dentry) {
1229                 struct inode *dir = req->r_parent;
1230
1231                 if (dir) {
1232                         err = fill_inode(dir, NULL,
1233                                          &rinfo->diri, rinfo->dirfrag,
1234                                          session, req->r_request_started, -1,
1235                                          &req->r_caps_reservation);
1236                         if (err < 0)
1237                                 goto done;
1238                 } else {
1239                         WARN_ON_ONCE(1);
1240                 }
1241
1242                 if (dir && req->r_op == CEPH_MDS_OP_LOOKUPNAME &&
1243                     test_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags) &&
1244                     !test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
1245                         struct qstr dname;
1246                         struct dentry *dn, *parent;
1247
1248                         BUG_ON(!rinfo->head->is_target);
1249                         BUG_ON(req->r_dentry);
1250
1251                         parent = d_find_any_alias(dir);
1252                         BUG_ON(!parent);
1253
1254                         dname.name = rinfo->dname;
1255                         dname.len = rinfo->dname_len;
1256                         dname.hash = full_name_hash(parent, dname.name, dname.len);
1257                         tvino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1258                         tvino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1259 retry_lookup:
1260                         dn = d_lookup(parent, &dname);
1261                         dout("d_lookup on parent=%p name=%.*s got %p\n",
1262                              parent, dname.len, dname.name, dn);
1263
1264                         if (!dn) {
1265                                 dn = d_alloc(parent, &dname);
1266                                 dout("d_alloc %p '%.*s' = %p\n", parent,
1267                                      dname.len, dname.name, dn);
1268                                 if (!dn) {
1269                                         dput(parent);
1270                                         err = -ENOMEM;
1271                                         goto done;
1272                                 }
1273                                 err = 0;
1274                         } else if (d_really_is_positive(dn) &&
1275                                    (ceph_ino(d_inode(dn)) != tvino.ino ||
1276                                     ceph_snap(d_inode(dn)) != tvino.snap)) {
1277                                 dout(" dn %p points to wrong inode %p\n",
1278                                      dn, d_inode(dn));
1279                                 ceph_dir_clear_ordered(dir);
1280                                 d_delete(dn);
1281                                 dput(dn);
1282                                 goto retry_lookup;
1283                         }
1284
1285                         req->r_dentry = dn;
1286                         dput(parent);
1287                 }
1288         }
1289
1290         if (rinfo->head->is_target) {
1291                 tvino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1292                 tvino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1293
1294                 in = ceph_get_inode(sb, tvino);
1295                 if (IS_ERR(in)) {
1296                         err = PTR_ERR(in);
1297                         goto done;
1298                 }
1299                 req->r_target_inode = in;
1300
1301                 err = fill_inode(in, req->r_locked_page, &rinfo->targeti, NULL,
1302                                 session, req->r_request_started,
1303                                 (!test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags) &&
1304                                 rinfo->head->result == 0) ?  req->r_fmode : -1,
1305                                 &req->r_caps_reservation);
1306                 if (err < 0) {
1307                         pr_err("fill_inode badness %p %llx.%llx\n",
1308                                 in, ceph_vinop(in));
1309                         goto done;
1310                 }
1311         }
1312
1313         /*
1314          * ignore null lease/binding on snapdir ENOENT, or else we
1315          * will have trouble splicing in the virtual snapdir later
1316          */
1317         if (rinfo->head->is_dentry &&
1318             !test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags) &&
1319             test_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags) &&
1320             (rinfo->head->is_target || strncmp(req->r_dentry->d_name.name,
1321                                                fsc->mount_options->snapdir_name,
1322                                                req->r_dentry->d_name.len))) {
1323                 /*
1324                  * lookup link rename   : null -> possibly existing inode
1325                  * mknod symlink mkdir  : null -> new inode
1326                  * unlink               : linked -> null
1327                  */
1328                 struct inode *dir = req->r_parent;
1329                 struct dentry *dn = req->r_dentry;
1330                 bool have_dir_cap, have_lease;
1331
1332                 BUG_ON(!dn);
1333                 BUG_ON(!dir);
1334                 BUG_ON(d_inode(dn->d_parent) != dir);
1335
1336                 dvino.ino = le64_to_cpu(rinfo->diri.in->ino);
1337                 dvino.snap = le64_to_cpu(rinfo->diri.in->snapid);
1338
1339                 BUG_ON(ceph_ino(dir) != dvino.ino);
1340                 BUG_ON(ceph_snap(dir) != dvino.snap);
1341
1342                 /* do we have a lease on the whole dir? */
1343                 have_dir_cap =
1344                         (le32_to_cpu(rinfo->diri.in->cap.caps) &
1345                          CEPH_CAP_FILE_SHARED);
1346
1347                 /* do we have a dn lease? */
1348                 have_lease = have_dir_cap ||
1349                         le32_to_cpu(rinfo->dlease->duration_ms);
1350                 if (!have_lease)
1351                         dout("fill_trace  no dentry lease or dir cap\n");
1352
1353                 /* rename? */
1354                 if (req->r_old_dentry && req->r_op == CEPH_MDS_OP_RENAME) {
1355                         struct inode *olddir = req->r_old_dentry_dir;
1356                         BUG_ON(!olddir);
1357
1358                         dout(" src %p '%pd' dst %p '%pd'\n",
1359                              req->r_old_dentry,
1360                              req->r_old_dentry,
1361                              dn, dn);
1362                         dout("fill_trace doing d_move %p -> %p\n",
1363                              req->r_old_dentry, dn);
1364
1365                         /* d_move screws up sibling dentries' offsets */
1366                         ceph_dir_clear_ordered(dir);
1367                         ceph_dir_clear_ordered(olddir);
1368
1369                         d_move(req->r_old_dentry, dn);
1370                         dout(" src %p '%pd' dst %p '%pd'\n",
1371                              req->r_old_dentry,
1372                              req->r_old_dentry,
1373                              dn, dn);
1374
1375                         /* ensure target dentry is invalidated, despite
1376                            rehashing bug in vfs_rename_dir */
1377                         ceph_invalidate_dentry_lease(dn);
1378
1379                         dout("dn %p gets new offset %lld\n", req->r_old_dentry,
1380                              ceph_dentry(req->r_old_dentry)->offset);
1381
1382                         /* swap r_dentry and r_old_dentry in case that
1383                          * splice_dentry() gets called later. This is safe
1384                          * because no other place will use them */
1385                         req->r_dentry = req->r_old_dentry;
1386                         req->r_old_dentry = dn;
1387                         dn = req->r_dentry;
1388                 }
1389
1390                 /* null dentry? */
1391                 if (!rinfo->head->is_target) {
1392                         dout("fill_trace null dentry\n");
1393                         if (d_really_is_positive(dn)) {
1394                                 dout("d_delete %p\n", dn);
1395                                 ceph_dir_clear_ordered(dir);
1396                                 d_delete(dn);
1397                         } else if (have_lease) {
1398                                 if (d_unhashed(dn))
1399                                         d_add(dn, NULL);
1400                                 update_dentry_lease(dir, dn,
1401                                                     rinfo->dlease, session,
1402                                                     req->r_request_started);
1403                         }
1404                         goto done;
1405                 }
1406
1407                 /* attach proper inode */
1408                 if (d_really_is_negative(dn)) {
1409                         ceph_dir_clear_ordered(dir);
1410                         ihold(in);
1411                         err = splice_dentry(&req->r_dentry, in);
1412                         if (err < 0)
1413                                 goto done;
1414                         dn = req->r_dentry;  /* may have spliced */
1415                 } else if (d_really_is_positive(dn) && d_inode(dn) != in) {
1416                         dout(" %p links to %p %llx.%llx, not %llx.%llx\n",
1417                              dn, d_inode(dn), ceph_vinop(d_inode(dn)),
1418                              ceph_vinop(in));
1419                         d_invalidate(dn);
1420                         have_lease = false;
1421                 }
1422
1423                 if (have_lease) {
1424                         update_dentry_lease(dir, dn,
1425                                             rinfo->dlease, session,
1426                                             req->r_request_started);
1427                 }
1428                 dout(" final dn %p\n", dn);
1429         } else if ((req->r_op == CEPH_MDS_OP_LOOKUPSNAP ||
1430                     req->r_op == CEPH_MDS_OP_MKSNAP) &&
1431                    !test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
1432                 struct inode *dir = req->r_parent;
1433
1434                 /* fill out a snapdir LOOKUPSNAP dentry */
1435                 BUG_ON(!dir);
1436                 BUG_ON(ceph_snap(dir) != CEPH_SNAPDIR);
1437                 BUG_ON(!req->r_dentry);
1438                 dout(" linking snapped dir %p to dn %p\n", in, req->r_dentry);
1439                 ceph_dir_clear_ordered(dir);
1440                 ihold(in);
1441                 err = splice_dentry(&req->r_dentry, in);
1442                 if (err < 0)
1443                         goto done;
1444         } else if (rinfo->head->is_dentry && req->r_dentry) {
1445                 /* parent inode is not locked, be carefull */
1446                 struct ceph_vino *ptvino = NULL;
1447                 dvino.ino = le64_to_cpu(rinfo->diri.in->ino);
1448                 dvino.snap = le64_to_cpu(rinfo->diri.in->snapid);
1449                 if (rinfo->head->is_target) {
1450                         tvino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1451                         tvino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1452                         ptvino = &tvino;
1453                 }
1454                 update_dentry_lease_careful(req->r_dentry, rinfo->dlease,
1455                                             session, req->r_request_started,
1456                                             rinfo->dname, rinfo->dname_len,
1457                                             &dvino, ptvino);
1458         }
1459 done:
1460         dout("fill_trace done err=%d\n", err);
1461         return err;
1462 }
1463
1464 /*
1465  * Prepopulate our cache with readdir results, leases, etc.
1466  */
1467 static int readdir_prepopulate_inodes_only(struct ceph_mds_request *req,
1468                                            struct ceph_mds_session *session)
1469 {
1470         struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1471         int i, err = 0;
1472
1473         for (i = 0; i < rinfo->dir_nr; i++) {
1474                 struct ceph_mds_reply_dir_entry *rde = rinfo->dir_entries + i;
1475                 struct ceph_vino vino;
1476                 struct inode *in;
1477                 int rc;
1478
1479                 vino.ino = le64_to_cpu(rde->inode.in->ino);
1480                 vino.snap = le64_to_cpu(rde->inode.in->snapid);
1481
1482                 in = ceph_get_inode(req->r_dentry->d_sb, vino);
1483                 if (IS_ERR(in)) {
1484                         err = PTR_ERR(in);
1485                         dout("new_inode badness got %d\n", err);
1486                         continue;
1487                 }
1488                 rc = fill_inode(in, NULL, &rde->inode, NULL, session,
1489                                 req->r_request_started, -1,
1490                                 &req->r_caps_reservation);
1491                 if (rc < 0) {
1492                         pr_err("fill_inode badness on %p got %d\n", in, rc);
1493                         err = rc;
1494                 }
1495                 /* avoid calling iput_final() in mds dispatch threads */
1496                 ceph_async_iput(in);
1497         }
1498
1499         return err;
1500 }
1501
1502 void ceph_readdir_cache_release(struct ceph_readdir_cache_control *ctl)
1503 {
1504         if (ctl->page) {
1505                 kunmap(ctl->page);
1506                 put_page(ctl->page);
1507                 ctl->page = NULL;
1508         }
1509 }
1510
1511 static int fill_readdir_cache(struct inode *dir, struct dentry *dn,
1512                               struct ceph_readdir_cache_control *ctl,
1513                               struct ceph_mds_request *req)
1514 {
1515         struct ceph_inode_info *ci = ceph_inode(dir);
1516         unsigned nsize = PAGE_SIZE / sizeof(struct dentry*);
1517         unsigned idx = ctl->index % nsize;
1518         pgoff_t pgoff = ctl->index / nsize;
1519
1520         if (!ctl->page || pgoff != page_index(ctl->page)) {
1521                 ceph_readdir_cache_release(ctl);
1522                 if (idx == 0)
1523                         ctl->page = grab_cache_page(&dir->i_data, pgoff);
1524                 else
1525                         ctl->page = find_lock_page(&dir->i_data, pgoff);
1526                 if (!ctl->page) {
1527                         ctl->index = -1;
1528                         return idx == 0 ? -ENOMEM : 0;
1529                 }
1530                 /* reading/filling the cache are serialized by
1531                  * i_mutex, no need to use page lock */
1532                 unlock_page(ctl->page);
1533                 ctl->dentries = kmap(ctl->page);
1534                 if (idx == 0)
1535                         memset(ctl->dentries, 0, PAGE_SIZE);
1536         }
1537
1538         if (req->r_dir_release_cnt == atomic64_read(&ci->i_release_count) &&
1539             req->r_dir_ordered_cnt == atomic64_read(&ci->i_ordered_count)) {
1540                 dout("readdir cache dn %p idx %d\n", dn, ctl->index);
1541                 ctl->dentries[idx] = dn;
1542                 ctl->index++;
1543         } else {
1544                 dout("disable readdir cache\n");
1545                 ctl->index = -1;
1546         }
1547         return 0;
1548 }
1549
1550 int ceph_readdir_prepopulate(struct ceph_mds_request *req,
1551                              struct ceph_mds_session *session)
1552 {
1553         struct dentry *parent = req->r_dentry;
1554         struct ceph_inode_info *ci = ceph_inode(d_inode(parent));
1555         struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1556         struct qstr dname;
1557         struct dentry *dn;
1558         struct inode *in;
1559         int err = 0, skipped = 0, ret, i;
1560         struct ceph_mds_request_head *rhead = req->r_request->front.iov_base;
1561         u32 frag = le32_to_cpu(rhead->args.readdir.frag);
1562         u32 last_hash = 0;
1563         u32 fpos_offset;
1564         struct ceph_readdir_cache_control cache_ctl = {};
1565
1566         if (test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags))
1567                 return readdir_prepopulate_inodes_only(req, session);
1568
1569         if (rinfo->hash_order) {
1570                 if (req->r_path2) {
1571                         last_hash = ceph_str_hash(ci->i_dir_layout.dl_dir_hash,
1572                                                   req->r_path2,
1573                                                   strlen(req->r_path2));
1574                         last_hash = ceph_frag_value(last_hash);
1575                 } else if (rinfo->offset_hash) {
1576                         /* mds understands offset_hash */
1577                         WARN_ON_ONCE(req->r_readdir_offset != 2);
1578                         last_hash = le32_to_cpu(rhead->args.readdir.offset_hash);
1579                 }
1580         }
1581
1582         if (rinfo->dir_dir &&
1583             le32_to_cpu(rinfo->dir_dir->frag) != frag) {
1584                 dout("readdir_prepopulate got new frag %x -> %x\n",
1585                      frag, le32_to_cpu(rinfo->dir_dir->frag));
1586                 frag = le32_to_cpu(rinfo->dir_dir->frag);
1587                 if (!rinfo->hash_order)
1588                         req->r_readdir_offset = 2;
1589         }
1590
1591         if (le32_to_cpu(rinfo->head->op) == CEPH_MDS_OP_LSSNAP) {
1592                 dout("readdir_prepopulate %d items under SNAPDIR dn %p\n",
1593                      rinfo->dir_nr, parent);
1594         } else {
1595                 dout("readdir_prepopulate %d items under dn %p\n",
1596                      rinfo->dir_nr, parent);
1597                 if (rinfo->dir_dir)
1598                         ceph_fill_dirfrag(d_inode(parent), rinfo->dir_dir);
1599
1600                 if (ceph_frag_is_leftmost(frag) &&
1601                     req->r_readdir_offset == 2 &&
1602                     !(rinfo->hash_order && last_hash)) {
1603                         /* note dir version at start of readdir so we can
1604                          * tell if any dentries get dropped */
1605                         req->r_dir_release_cnt =
1606                                 atomic64_read(&ci->i_release_count);
1607                         req->r_dir_ordered_cnt =
1608                                 atomic64_read(&ci->i_ordered_count);
1609                         req->r_readdir_cache_idx = 0;
1610                 }
1611         }
1612
1613         cache_ctl.index = req->r_readdir_cache_idx;
1614         fpos_offset = req->r_readdir_offset;
1615
1616         /* FIXME: release caps/leases if error occurs */
1617         for (i = 0; i < rinfo->dir_nr; i++) {
1618                 struct ceph_mds_reply_dir_entry *rde = rinfo->dir_entries + i;
1619                 struct ceph_vino tvino;
1620
1621                 dname.name = rde->name;
1622                 dname.len = rde->name_len;
1623                 dname.hash = full_name_hash(parent, dname.name, dname.len);
1624
1625                 tvino.ino = le64_to_cpu(rde->inode.in->ino);
1626                 tvino.snap = le64_to_cpu(rde->inode.in->snapid);
1627
1628                 if (rinfo->hash_order) {
1629                         u32 hash = ceph_str_hash(ci->i_dir_layout.dl_dir_hash,
1630                                                  rde->name, rde->name_len);
1631                         hash = ceph_frag_value(hash);
1632                         if (hash != last_hash)
1633                                 fpos_offset = 2;
1634                         last_hash = hash;
1635                         rde->offset = ceph_make_fpos(hash, fpos_offset++, true);
1636                 } else {
1637                         rde->offset = ceph_make_fpos(frag, fpos_offset++, false);
1638                 }
1639
1640 retry_lookup:
1641                 dn = d_lookup(parent, &dname);
1642                 dout("d_lookup on parent=%p name=%.*s got %p\n",
1643                      parent, dname.len, dname.name, dn);
1644
1645                 if (!dn) {
1646                         dn = d_alloc(parent, &dname);
1647                         dout("d_alloc %p '%.*s' = %p\n", parent,
1648                              dname.len, dname.name, dn);
1649                         if (!dn) {
1650                                 dout("d_alloc badness\n");
1651                                 err = -ENOMEM;
1652                                 goto out;
1653                         }
1654                 } else if (d_really_is_positive(dn) &&
1655                            (ceph_ino(d_inode(dn)) != tvino.ino ||
1656                             ceph_snap(d_inode(dn)) != tvino.snap)) {
1657                         struct ceph_dentry_info *di = ceph_dentry(dn);
1658                         dout(" dn %p points to wrong inode %p\n",
1659                              dn, d_inode(dn));
1660
1661                         spin_lock(&dn->d_lock);
1662                         if (di->offset > 0 &&
1663                             di->lease_shared_gen ==
1664                             atomic_read(&ci->i_shared_gen)) {
1665                                 __ceph_dir_clear_ordered(ci);
1666                                 di->offset = 0;
1667                         }
1668                         spin_unlock(&dn->d_lock);
1669
1670                         d_delete(dn);
1671                         dput(dn);
1672                         goto retry_lookup;
1673                 }
1674
1675                 /* inode */
1676                 if (d_really_is_positive(dn)) {
1677                         in = d_inode(dn);
1678                 } else {
1679                         in = ceph_get_inode(parent->d_sb, tvino);
1680                         if (IS_ERR(in)) {
1681                                 dout("new_inode badness\n");
1682                                 d_drop(dn);
1683                                 dput(dn);
1684                                 err = PTR_ERR(in);
1685                                 goto out;
1686                         }
1687                 }
1688
1689                 ret = fill_inode(in, NULL, &rde->inode, NULL, session,
1690                                  req->r_request_started, -1,
1691                                  &req->r_caps_reservation);
1692                 if (ret < 0) {
1693                         pr_err("fill_inode badness on %p\n", in);
1694                         if (d_really_is_negative(dn)) {
1695                                 /* avoid calling iput_final() in mds
1696                                  * dispatch threads */
1697                                 ceph_async_iput(in);
1698                         }
1699                         d_drop(dn);
1700                         err = ret;
1701                         goto next_item;
1702                 }
1703
1704                 if (d_really_is_negative(dn)) {
1705                         if (ceph_security_xattr_deadlock(in)) {
1706                                 dout(" skip splicing dn %p to inode %p"
1707                                      " (security xattr deadlock)\n", dn, in);
1708                                 ceph_async_iput(in);
1709                                 skipped++;
1710                                 goto next_item;
1711                         }
1712
1713                         err = splice_dentry(&dn, in);
1714                         if (err < 0)
1715                                 goto next_item;
1716                 }
1717
1718                 ceph_dentry(dn)->offset = rde->offset;
1719
1720                 update_dentry_lease(d_inode(parent), dn,
1721                                     rde->lease, req->r_session,
1722                                     req->r_request_started);
1723
1724                 if (err == 0 && skipped == 0 && cache_ctl.index >= 0) {
1725                         ret = fill_readdir_cache(d_inode(parent), dn,
1726                                                  &cache_ctl, req);
1727                         if (ret < 0)
1728                                 err = ret;
1729                 }
1730 next_item:
1731                 dput(dn);
1732         }
1733 out:
1734         if (err == 0 && skipped == 0) {
1735                 set_bit(CEPH_MDS_R_DID_PREPOPULATE, &req->r_req_flags);
1736                 req->r_readdir_cache_idx = cache_ctl.index;
1737         }
1738         ceph_readdir_cache_release(&cache_ctl);
1739         dout("readdir_prepopulate done\n");
1740         return err;
1741 }
1742
1743 bool ceph_inode_set_size(struct inode *inode, loff_t size)
1744 {
1745         struct ceph_inode_info *ci = ceph_inode(inode);
1746         bool ret;
1747
1748         spin_lock(&ci->i_ceph_lock);
1749         dout("set_size %p %llu -> %llu\n", inode, inode->i_size, size);
1750         i_size_write(inode, size);
1751         inode->i_blocks = calc_inode_blocks(size);
1752
1753         ret = __ceph_should_report_size(ci);
1754
1755         spin_unlock(&ci->i_ceph_lock);
1756         return ret;
1757 }
1758
1759 /*
1760  * Put reference to inode, but avoid calling iput_final() in current thread.
1761  * iput_final() may wait for reahahead pages. The wait can cause deadlock in
1762  * some contexts.
1763  */
1764 void ceph_async_iput(struct inode *inode)
1765 {
1766         if (!inode)
1767                 return;
1768         for (;;) {
1769                 if (atomic_add_unless(&inode->i_count, -1, 1))
1770                         break;
1771                 if (queue_work(ceph_inode_to_client(inode)->inode_wq,
1772                                &ceph_inode(inode)->i_work))
1773                         break;
1774                 /* queue work failed, i_count must be at least 2 */
1775         }
1776 }
1777
1778 /*
1779  * Write back inode data in a worker thread.  (This can't be done
1780  * in the message handler context.)
1781  */
1782 void ceph_queue_writeback(struct inode *inode)
1783 {
1784         struct ceph_inode_info *ci = ceph_inode(inode);
1785         set_bit(CEPH_I_WORK_WRITEBACK, &ci->i_work_mask);
1786
1787         ihold(inode);
1788         if (queue_work(ceph_inode_to_client(inode)->inode_wq,
1789                        &ci->i_work)) {
1790                 dout("ceph_queue_writeback %p\n", inode);
1791         } else {
1792                 dout("ceph_queue_writeback %p already queued, mask=%lx\n",
1793                      inode, ci->i_work_mask);
1794                 iput(inode);
1795         }
1796 }
1797
1798 /*
1799  * queue an async invalidation
1800  */
1801 void ceph_queue_invalidate(struct inode *inode)
1802 {
1803         struct ceph_inode_info *ci = ceph_inode(inode);
1804         set_bit(CEPH_I_WORK_INVALIDATE_PAGES, &ci->i_work_mask);
1805
1806         ihold(inode);
1807         if (queue_work(ceph_inode_to_client(inode)->inode_wq,
1808                        &ceph_inode(inode)->i_work)) {
1809                 dout("ceph_queue_invalidate %p\n", inode);
1810         } else {
1811                 dout("ceph_queue_invalidate %p already queued, mask=%lx\n",
1812                      inode, ci->i_work_mask);
1813                 iput(inode);
1814         }
1815 }
1816
1817 /*
1818  * Queue an async vmtruncate.  If we fail to queue work, we will handle
1819  * the truncation the next time we call __ceph_do_pending_vmtruncate.
1820  */
1821 void ceph_queue_vmtruncate(struct inode *inode)
1822 {
1823         struct ceph_inode_info *ci = ceph_inode(inode);
1824         set_bit(CEPH_I_WORK_VMTRUNCATE, &ci->i_work_mask);
1825
1826         ihold(inode);
1827         if (queue_work(ceph_inode_to_client(inode)->inode_wq,
1828                        &ci->i_work)) {
1829                 dout("ceph_queue_vmtruncate %p\n", inode);
1830         } else {
1831                 dout("ceph_queue_vmtruncate %p already queued, mask=%lx\n",
1832                      inode, ci->i_work_mask);
1833                 iput(inode);
1834         }
1835 }
1836
1837 static void ceph_do_invalidate_pages(struct inode *inode)
1838 {
1839         struct ceph_inode_info *ci = ceph_inode(inode);
1840         struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1841         u32 orig_gen;
1842         int check = 0;
1843
1844         mutex_lock(&ci->i_truncate_mutex);
1845
1846         if (READ_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) {
1847                 pr_warn_ratelimited("invalidate_pages %p %lld forced umount\n",
1848                                     inode, ceph_ino(inode));
1849                 mapping_set_error(inode->i_mapping, -EIO);
1850                 truncate_pagecache(inode, 0);
1851                 mutex_unlock(&ci->i_truncate_mutex);
1852                 goto out;
1853         }
1854
1855         spin_lock(&ci->i_ceph_lock);
1856         dout("invalidate_pages %p gen %d revoking %d\n", inode,
1857              ci->i_rdcache_gen, ci->i_rdcache_revoking);
1858         if (ci->i_rdcache_revoking != ci->i_rdcache_gen) {
1859                 if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE))
1860                         check = 1;
1861                 spin_unlock(&ci->i_ceph_lock);
1862                 mutex_unlock(&ci->i_truncate_mutex);
1863                 goto out;
1864         }
1865         orig_gen = ci->i_rdcache_gen;
1866         spin_unlock(&ci->i_ceph_lock);
1867
1868         if (invalidate_inode_pages2(inode->i_mapping) < 0) {
1869                 pr_err("invalidate_pages %p fails\n", inode);
1870         }
1871
1872         spin_lock(&ci->i_ceph_lock);
1873         if (orig_gen == ci->i_rdcache_gen &&
1874             orig_gen == ci->i_rdcache_revoking) {
1875                 dout("invalidate_pages %p gen %d successful\n", inode,
1876                      ci->i_rdcache_gen);
1877                 ci->i_rdcache_revoking--;
1878                 check = 1;
1879         } else {
1880                 dout("invalidate_pages %p gen %d raced, now %d revoking %d\n",
1881                      inode, orig_gen, ci->i_rdcache_gen,
1882                      ci->i_rdcache_revoking);
1883                 if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE))
1884                         check = 1;
1885         }
1886         spin_unlock(&ci->i_ceph_lock);
1887         mutex_unlock(&ci->i_truncate_mutex);
1888 out:
1889         if (check)
1890                 ceph_check_caps(ci, 0, NULL);
1891 }
1892
1893 /*
1894  * Make sure any pending truncation is applied before doing anything
1895  * that may depend on it.
1896  */
1897 void __ceph_do_pending_vmtruncate(struct inode *inode)
1898 {
1899         struct ceph_inode_info *ci = ceph_inode(inode);
1900         u64 to;
1901         int wrbuffer_refs, finish = 0;
1902
1903         mutex_lock(&ci->i_truncate_mutex);
1904 retry:
1905         spin_lock(&ci->i_ceph_lock);
1906         if (ci->i_truncate_pending == 0) {
1907                 dout("__do_pending_vmtruncate %p none pending\n", inode);
1908                 spin_unlock(&ci->i_ceph_lock);
1909                 mutex_unlock(&ci->i_truncate_mutex);
1910                 return;
1911         }
1912
1913         /*
1914          * make sure any dirty snapped pages are flushed before we
1915          * possibly truncate them.. so write AND block!
1916          */
1917         if (ci->i_wrbuffer_ref_head < ci->i_wrbuffer_ref) {
1918                 spin_unlock(&ci->i_ceph_lock);
1919                 dout("__do_pending_vmtruncate %p flushing snaps first\n",
1920                      inode);
1921                 filemap_write_and_wait_range(&inode->i_data, 0,
1922                                              inode->i_sb->s_maxbytes);
1923                 goto retry;
1924         }
1925
1926         /* there should be no reader or writer */
1927         WARN_ON_ONCE(ci->i_rd_ref || ci->i_wr_ref);
1928
1929         to = ci->i_truncate_size;
1930         wrbuffer_refs = ci->i_wrbuffer_ref;
1931         dout("__do_pending_vmtruncate %p (%d) to %lld\n", inode,
1932              ci->i_truncate_pending, to);
1933         spin_unlock(&ci->i_ceph_lock);
1934
1935         truncate_pagecache(inode, to);
1936
1937         spin_lock(&ci->i_ceph_lock);
1938         if (to == ci->i_truncate_size) {
1939                 ci->i_truncate_pending = 0;
1940                 finish = 1;
1941         }
1942         spin_unlock(&ci->i_ceph_lock);
1943         if (!finish)
1944                 goto retry;
1945
1946         mutex_unlock(&ci->i_truncate_mutex);
1947
1948         if (wrbuffer_refs == 0)
1949                 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
1950
1951         wake_up_all(&ci->i_cap_wq);
1952 }
1953
1954 static void ceph_inode_work(struct work_struct *work)
1955 {
1956         struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1957                                                  i_work);
1958         struct inode *inode = &ci->vfs_inode;
1959
1960         if (test_and_clear_bit(CEPH_I_WORK_WRITEBACK, &ci->i_work_mask)) {
1961                 dout("writeback %p\n", inode);
1962                 filemap_fdatawrite(&inode->i_data);
1963         }
1964         if (test_and_clear_bit(CEPH_I_WORK_INVALIDATE_PAGES, &ci->i_work_mask))
1965                 ceph_do_invalidate_pages(inode);
1966
1967         if (test_and_clear_bit(CEPH_I_WORK_VMTRUNCATE, &ci->i_work_mask))
1968                 __ceph_do_pending_vmtruncate(inode);
1969
1970         iput(inode);
1971 }
1972
1973 /*
1974  * symlinks
1975  */
1976 static const struct inode_operations ceph_symlink_iops = {
1977         .get_link = simple_get_link,
1978         .setattr = ceph_setattr,
1979         .getattr = ceph_getattr,
1980         .listxattr = ceph_listxattr,
1981 };
1982
1983 int __ceph_setattr(struct inode *inode, struct iattr *attr)
1984 {
1985         struct ceph_inode_info *ci = ceph_inode(inode);
1986         const unsigned int ia_valid = attr->ia_valid;
1987         struct ceph_mds_request *req;
1988         struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
1989         struct ceph_cap_flush *prealloc_cf;
1990         int issued;
1991         int release = 0, dirtied = 0;
1992         int mask = 0;
1993         int err = 0;
1994         int inode_dirty_flags = 0;
1995         bool lock_snap_rwsem = false;
1996
1997         prealloc_cf = ceph_alloc_cap_flush();
1998         if (!prealloc_cf)
1999                 return -ENOMEM;
2000
2001         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETATTR,
2002                                        USE_AUTH_MDS);
2003         if (IS_ERR(req)) {
2004                 ceph_free_cap_flush(prealloc_cf);
2005                 return PTR_ERR(req);
2006         }
2007
2008         spin_lock(&ci->i_ceph_lock);
2009         issued = __ceph_caps_issued(ci, NULL);
2010
2011         if (!ci->i_head_snapc &&
2012             (issued & (CEPH_CAP_ANY_EXCL | CEPH_CAP_FILE_WR))) {
2013                 lock_snap_rwsem = true;
2014                 if (!down_read_trylock(&mdsc->snap_rwsem)) {
2015                         spin_unlock(&ci->i_ceph_lock);
2016                         down_read(&mdsc->snap_rwsem);
2017                         spin_lock(&ci->i_ceph_lock);
2018                         issued = __ceph_caps_issued(ci, NULL);
2019                 }
2020         }
2021
2022         dout("setattr %p issued %s\n", inode, ceph_cap_string(issued));
2023
2024         if (ia_valid & ATTR_UID) {
2025                 dout("setattr %p uid %d -> %d\n", inode,
2026                      from_kuid(&init_user_ns, inode->i_uid),
2027                      from_kuid(&init_user_ns, attr->ia_uid));
2028                 if (issued & CEPH_CAP_AUTH_EXCL) {
2029                         inode->i_uid = attr->ia_uid;
2030                         dirtied |= CEPH_CAP_AUTH_EXCL;
2031                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
2032                            !uid_eq(attr->ia_uid, inode->i_uid)) {
2033                         req->r_args.setattr.uid = cpu_to_le32(
2034                                 from_kuid(&init_user_ns, attr->ia_uid));
2035                         mask |= CEPH_SETATTR_UID;
2036                         release |= CEPH_CAP_AUTH_SHARED;
2037                 }
2038         }
2039         if (ia_valid & ATTR_GID) {
2040                 dout("setattr %p gid %d -> %d\n", inode,
2041                      from_kgid(&init_user_ns, inode->i_gid),
2042                      from_kgid(&init_user_ns, attr->ia_gid));
2043                 if (issued & CEPH_CAP_AUTH_EXCL) {
2044                         inode->i_gid = attr->ia_gid;
2045                         dirtied |= CEPH_CAP_AUTH_EXCL;
2046                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
2047                            !gid_eq(attr->ia_gid, inode->i_gid)) {
2048                         req->r_args.setattr.gid = cpu_to_le32(
2049                                 from_kgid(&init_user_ns, attr->ia_gid));
2050                         mask |= CEPH_SETATTR_GID;
2051                         release |= CEPH_CAP_AUTH_SHARED;
2052                 }
2053         }
2054         if (ia_valid & ATTR_MODE) {
2055                 dout("setattr %p mode 0%o -> 0%o\n", inode, inode->i_mode,
2056                      attr->ia_mode);
2057                 if (issued & CEPH_CAP_AUTH_EXCL) {
2058                         inode->i_mode = attr->ia_mode;
2059                         dirtied |= CEPH_CAP_AUTH_EXCL;
2060                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
2061                            attr->ia_mode != inode->i_mode) {
2062                         inode->i_mode = attr->ia_mode;
2063                         req->r_args.setattr.mode = cpu_to_le32(attr->ia_mode);
2064                         mask |= CEPH_SETATTR_MODE;
2065                         release |= CEPH_CAP_AUTH_SHARED;
2066                 }
2067         }
2068
2069         if (ia_valid & ATTR_ATIME) {
2070                 dout("setattr %p atime %lld.%ld -> %lld.%ld\n", inode,
2071                      inode->i_atime.tv_sec, inode->i_atime.tv_nsec,
2072                      attr->ia_atime.tv_sec, attr->ia_atime.tv_nsec);
2073                 if (issued & CEPH_CAP_FILE_EXCL) {
2074                         ci->i_time_warp_seq++;
2075                         inode->i_atime = attr->ia_atime;
2076                         dirtied |= CEPH_CAP_FILE_EXCL;
2077                 } else if ((issued & CEPH_CAP_FILE_WR) &&
2078                            timespec64_compare(&inode->i_atime,
2079                                             &attr->ia_atime) < 0) {
2080                         inode->i_atime = attr->ia_atime;
2081                         dirtied |= CEPH_CAP_FILE_WR;
2082                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
2083                            !timespec64_equal(&inode->i_atime, &attr->ia_atime)) {
2084                         ceph_encode_timespec64(&req->r_args.setattr.atime,
2085                                                &attr->ia_atime);
2086                         mask |= CEPH_SETATTR_ATIME;
2087                         release |= CEPH_CAP_FILE_SHARED |
2088                                    CEPH_CAP_FILE_RD | CEPH_CAP_FILE_WR;
2089                 }
2090         }
2091         if (ia_valid & ATTR_MTIME) {
2092                 dout("setattr %p mtime %lld.%ld -> %lld.%ld\n", inode,
2093                      inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
2094                      attr->ia_mtime.tv_sec, attr->ia_mtime.tv_nsec);
2095                 if (issued & CEPH_CAP_FILE_EXCL) {
2096                         ci->i_time_warp_seq++;
2097                         inode->i_mtime = attr->ia_mtime;
2098                         dirtied |= CEPH_CAP_FILE_EXCL;
2099                 } else if ((issued & CEPH_CAP_FILE_WR) &&
2100                            timespec64_compare(&inode->i_mtime,
2101                                             &attr->ia_mtime) < 0) {
2102                         inode->i_mtime = attr->ia_mtime;
2103                         dirtied |= CEPH_CAP_FILE_WR;
2104                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
2105                            !timespec64_equal(&inode->i_mtime, &attr->ia_mtime)) {
2106                         ceph_encode_timespec64(&req->r_args.setattr.mtime,
2107                                                &attr->ia_mtime);
2108                         mask |= CEPH_SETATTR_MTIME;
2109                         release |= CEPH_CAP_FILE_SHARED |
2110                                    CEPH_CAP_FILE_RD | CEPH_CAP_FILE_WR;
2111                 }
2112         }
2113         if (ia_valid & ATTR_SIZE) {
2114                 dout("setattr %p size %lld -> %lld\n", inode,
2115                      inode->i_size, attr->ia_size);
2116                 if ((issued & CEPH_CAP_FILE_EXCL) &&
2117                     attr->ia_size > inode->i_size) {
2118                         i_size_write(inode, attr->ia_size);
2119                         inode->i_blocks = calc_inode_blocks(attr->ia_size);
2120                         ci->i_reported_size = attr->ia_size;
2121                         dirtied |= CEPH_CAP_FILE_EXCL;
2122                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
2123                            attr->ia_size != inode->i_size) {
2124                         req->r_args.setattr.size = cpu_to_le64(attr->ia_size);
2125                         req->r_args.setattr.old_size =
2126                                 cpu_to_le64(inode->i_size);
2127                         mask |= CEPH_SETATTR_SIZE;
2128                         release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_EXCL |
2129                                    CEPH_CAP_FILE_RD | CEPH_CAP_FILE_WR;
2130                 }
2131         }
2132
2133         /* these do nothing */
2134         if (ia_valid & ATTR_CTIME) {
2135                 bool only = (ia_valid & (ATTR_SIZE|ATTR_MTIME|ATTR_ATIME|
2136                                          ATTR_MODE|ATTR_UID|ATTR_GID)) == 0;
2137                 dout("setattr %p ctime %lld.%ld -> %lld.%ld (%s)\n", inode,
2138                      inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
2139                      attr->ia_ctime.tv_sec, attr->ia_ctime.tv_nsec,
2140                      only ? "ctime only" : "ignored");
2141                 if (only) {
2142                         /*
2143                          * if kernel wants to dirty ctime but nothing else,
2144                          * we need to choose a cap to dirty under, or do
2145                          * a almost-no-op setattr
2146                          */
2147                         if (issued & CEPH_CAP_AUTH_EXCL)
2148                                 dirtied |= CEPH_CAP_AUTH_EXCL;
2149                         else if (issued & CEPH_CAP_FILE_EXCL)
2150                                 dirtied |= CEPH_CAP_FILE_EXCL;
2151                         else if (issued & CEPH_CAP_XATTR_EXCL)
2152                                 dirtied |= CEPH_CAP_XATTR_EXCL;
2153                         else
2154                                 mask |= CEPH_SETATTR_CTIME;
2155                 }
2156         }
2157         if (ia_valid & ATTR_FILE)
2158                 dout("setattr %p ATTR_FILE ... hrm!\n", inode);
2159
2160         if (dirtied) {
2161                 inode_dirty_flags = __ceph_mark_dirty_caps(ci, dirtied,
2162                                                            &prealloc_cf);
2163                 inode->i_ctime = attr->ia_ctime;
2164         }
2165
2166         release &= issued;
2167         spin_unlock(&ci->i_ceph_lock);
2168         if (lock_snap_rwsem)
2169                 up_read(&mdsc->snap_rwsem);
2170
2171         if (inode_dirty_flags)
2172                 __mark_inode_dirty(inode, inode_dirty_flags);
2173
2174
2175         if (mask) {
2176                 req->r_inode = inode;
2177                 ihold(inode);
2178                 req->r_inode_drop = release;
2179                 req->r_args.setattr.mask = cpu_to_le32(mask);
2180                 req->r_num_caps = 1;
2181                 req->r_stamp = attr->ia_ctime;
2182                 err = ceph_mdsc_do_request(mdsc, NULL, req);
2183         }
2184         dout("setattr %p result=%d (%s locally, %d remote)\n", inode, err,
2185              ceph_cap_string(dirtied), mask);
2186
2187         ceph_mdsc_put_request(req);
2188         ceph_free_cap_flush(prealloc_cf);
2189
2190         if (err >= 0 && (mask & CEPH_SETATTR_SIZE))
2191                 __ceph_do_pending_vmtruncate(inode);
2192
2193         return err;
2194 }
2195
2196 /*
2197  * setattr
2198  */
2199 int ceph_setattr(struct dentry *dentry, struct iattr *attr)
2200 {
2201         struct inode *inode = d_inode(dentry);
2202         struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
2203         int err;
2204
2205         if (ceph_snap(inode) != CEPH_NOSNAP)
2206                 return -EROFS;
2207
2208         err = setattr_prepare(dentry, attr);
2209         if (err != 0)
2210                 return err;
2211
2212         if ((attr->ia_valid & ATTR_SIZE) &&
2213             attr->ia_size > max(inode->i_size, fsc->max_file_size))
2214                 return -EFBIG;
2215
2216         if ((attr->ia_valid & ATTR_SIZE) &&
2217             ceph_quota_is_max_bytes_exceeded(inode, attr->ia_size))
2218                 return -EDQUOT;
2219
2220         err = __ceph_setattr(inode, attr);
2221
2222         if (err >= 0 && (attr->ia_valid & ATTR_MODE))
2223                 err = posix_acl_chmod(inode, attr->ia_mode);
2224
2225         return err;
2226 }
2227
2228 /*
2229  * Verify that we have a lease on the given mask.  If not,
2230  * do a getattr against an mds.
2231  */
2232 int __ceph_do_getattr(struct inode *inode, struct page *locked_page,
2233                       int mask, bool force)
2234 {
2235         struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
2236         struct ceph_mds_client *mdsc = fsc->mdsc;
2237         struct ceph_mds_request *req;
2238         int mode;
2239         int err;
2240
2241         if (ceph_snap(inode) == CEPH_SNAPDIR) {
2242                 dout("do_getattr inode %p SNAPDIR\n", inode);
2243                 return 0;
2244         }
2245
2246         dout("do_getattr inode %p mask %s mode 0%o\n",
2247              inode, ceph_cap_string(mask), inode->i_mode);
2248         if (!force && ceph_caps_issued_mask(ceph_inode(inode), mask, 1))
2249                 return 0;
2250
2251         mode = (mask & CEPH_STAT_RSTAT) ? USE_AUTH_MDS : USE_ANY_MDS;
2252         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, mode);
2253         if (IS_ERR(req))
2254                 return PTR_ERR(req);
2255         req->r_inode = inode;
2256         ihold(inode);
2257         req->r_num_caps = 1;
2258         req->r_args.getattr.mask = cpu_to_le32(mask);
2259         req->r_locked_page = locked_page;
2260         err = ceph_mdsc_do_request(mdsc, NULL, req);
2261         if (locked_page && err == 0) {
2262                 u64 inline_version = req->r_reply_info.targeti.inline_version;
2263                 if (inline_version == 0) {
2264                         /* the reply is supposed to contain inline data */
2265                         err = -EINVAL;
2266                 } else if (inline_version == CEPH_INLINE_NONE) {
2267                         err = -ENODATA;
2268                 } else {
2269                         err = req->r_reply_info.targeti.inline_len;
2270                 }
2271         }
2272         ceph_mdsc_put_request(req);
2273         dout("do_getattr result=%d\n", err);
2274         return err;
2275 }
2276
2277
2278 /*
2279  * Check inode permissions.  We verify we have a valid value for
2280  * the AUTH cap, then call the generic handler.
2281  */
2282 int ceph_permission(struct inode *inode, int mask)
2283 {
2284         int err;
2285
2286         if (mask & MAY_NOT_BLOCK)
2287                 return -ECHILD;
2288
2289         err = ceph_do_getattr(inode, CEPH_CAP_AUTH_SHARED, false);
2290
2291         if (!err)
2292                 err = generic_permission(inode, mask);
2293         return err;
2294 }
2295
2296 /* Craft a mask of needed caps given a set of requested statx attrs. */
2297 static int statx_to_caps(u32 want)
2298 {
2299         int mask = 0;
2300
2301         if (want & (STATX_MODE|STATX_UID|STATX_GID|STATX_CTIME|STATX_BTIME))
2302                 mask |= CEPH_CAP_AUTH_SHARED;
2303
2304         if (want & (STATX_NLINK|STATX_CTIME))
2305                 mask |= CEPH_CAP_LINK_SHARED;
2306
2307         if (want & (STATX_ATIME|STATX_MTIME|STATX_CTIME|STATX_SIZE|
2308                     STATX_BLOCKS))
2309                 mask |= CEPH_CAP_FILE_SHARED;
2310
2311         if (want & (STATX_CTIME))
2312                 mask |= CEPH_CAP_XATTR_SHARED;
2313
2314         return mask;
2315 }
2316
2317 /*
2318  * Get all the attributes. If we have sufficient caps for the requested attrs,
2319  * then we can avoid talking to the MDS at all.
2320  */
2321 int ceph_getattr(const struct path *path, struct kstat *stat,
2322                  u32 request_mask, unsigned int flags)
2323 {
2324         struct inode *inode = d_inode(path->dentry);
2325         struct ceph_inode_info *ci = ceph_inode(inode);
2326         u32 valid_mask = STATX_BASIC_STATS;
2327         int err = 0;
2328
2329         /* Skip the getattr altogether if we're asked not to sync */
2330         if (!(flags & AT_STATX_DONT_SYNC)) {
2331                 err = ceph_do_getattr(inode, statx_to_caps(request_mask),
2332                                       flags & AT_STATX_FORCE_SYNC);
2333                 if (err)
2334                         return err;
2335         }
2336
2337         generic_fillattr(inode, stat);
2338         stat->ino = ceph_translate_ino(inode->i_sb, inode->i_ino);
2339
2340         /*
2341          * btime on newly-allocated inodes is 0, so if this is still set to
2342          * that, then assume that it's not valid.
2343          */
2344         if (ci->i_btime.tv_sec || ci->i_btime.tv_nsec) {
2345                 stat->btime = ci->i_btime;
2346                 valid_mask |= STATX_BTIME;
2347         }
2348
2349         if (ceph_snap(inode) == CEPH_NOSNAP)
2350                 stat->dev = inode->i_sb->s_dev;
2351         else
2352                 stat->dev = ci->i_snapid_map ? ci->i_snapid_map->dev : 0;
2353
2354         if (S_ISDIR(inode->i_mode)) {
2355                 if (ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb),
2356                                         RBYTES))
2357                         stat->size = ci->i_rbytes;
2358                 else
2359                         stat->size = ci->i_files + ci->i_subdirs;
2360                 stat->blocks = 0;
2361                 stat->blksize = 65536;
2362                 /*
2363                  * Some applications rely on the number of st_nlink
2364                  * value on directories to be either 0 (if unlinked)
2365                  * or 2 + number of subdirectories.
2366                  */
2367                 if (stat->nlink == 1)
2368                         /* '.' + '..' + subdirs */
2369                         stat->nlink = 1 + 1 + ci->i_subdirs;
2370         }
2371
2372         stat->result_mask = request_mask & valid_mask;
2373         return err;
2374 }