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 #include <linux/iversion.h>
  17
  18 #include "super.h"
  19 #include "mds_client.h"
  20 #include "cache.h"
  21 #include <linux/ceph/decode.h>
  22
  23 /*
  24  * Ceph inode operations
  25  *
  26  * Implement basic inode helpers (get, alloc) and inode ops (getattr,
  27  * setattr, etc.), xattr helpers, and helpers for assimilating
  28  * metadata returned by the MDS into our cache.
  29  *
  30  * Also define helpers for doing asynchronous writeback, invalidation,
  31  * and truncation for the benefit of those who can't afford to block
  32  * (typically because they are in the message handler path).
  33  */
  34
  35 static const struct inode_operations ceph_symlink_iops;
  36
  37 static void ceph_inode_work(struct work_struct *work);
  38
  39 /*
  40  * find or create an inode, given the ceph ino number
  41  */
  42 static int ceph_set_ino_cb(struct inode *inode, void *data)
  43 {
  44         struct ceph_inode_info *ci = ceph_inode(inode);
  45         struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb);
  46
  47         ci->i_vino = *(struct ceph_vino *)data;
  48         inode->i_ino = ceph_vino_to_ino_t(ci->i_vino);
  49         inode_set_iversion_raw(inode, 0);
  50         percpu_counter_inc(&mdsc->metric.total_inodes);
  51
  52         return 0;
  53 }
  54
  55 struct inode *ceph_get_inode(struct super_block *sb, struct ceph_vino vino)
  56 {
  57         struct inode *inode;
  58
  59         if (ceph_vino_is_reserved(vino))
  60                 return ERR_PTR(-EREMOTEIO);
  61
  62         inode = iget5_locked(sb, (unsigned long)vino.ino, ceph_ino_compare,
  63                              ceph_set_ino_cb, &vino);
  64         if (!inode)
  65                 return ERR_PTR(-ENOMEM);
  66
  67         dout("get_inode on %llu=%llx.%llx got %p new %d\n", ceph_present_inode(inode),
  68              ceph_vinop(inode), inode, !!(inode->i_state & I_NEW));
  69         return inode;
  70 }
  71
  72 /*
  73  * get/constuct snapdir inode for a given directory
  74  */
  75 struct inode *ceph_get_snapdir(struct inode *parent)
  76 {
  77         struct ceph_vino vino = {
  78                 .ino = ceph_ino(parent),
  79                 .snap = CEPH_SNAPDIR,
  80         };
  81         struct inode *inode = ceph_get_inode(parent->i_sb, vino);
  82         struct ceph_inode_info *ci = ceph_inode(inode);
  83
  84         BUG_ON(!S_ISDIR(parent->i_mode));
  85         if (IS_ERR(inode))
  86                 return inode;
  87         inode->i_mode = parent->i_mode;
  88         inode->i_uid = parent->i_uid;
  89         inode->i_gid = parent->i_gid;
  90         inode->i_mtime = parent->i_mtime;
  91         inode->i_ctime = parent->i_ctime;
  92         inode->i_atime = parent->i_atime;
  93         ci->i_rbytes = 0;
  94         ci->i_btime = ceph_inode(parent)->i_btime;
  95
  96         if (inode->i_state & I_NEW) {
  97                 inode->i_op = &ceph_snapdir_iops;
  98                 inode->i_fop = &ceph_snapdir_fops;
  99                 ci->i_snap_caps = CEPH_CAP_PIN; /* so we can open */
 100                 unlock_new_inode(inode);
 101         }
 102
 103         return inode;
 104 }
 105
 106 const struct inode_operations ceph_file_iops = {
 107         .permission = ceph_permission,
 108         .setattr = ceph_setattr,
 109         .getattr = ceph_getattr,
 110         .listxattr = ceph_listxattr,
 111         .get_acl = ceph_get_acl,
 112         .set_acl = ceph_set_acl,
 113 };
 114
 115
 116 /*
 117  * We use a 'frag tree' to keep track of the MDS's directory fragments
 118  * for a given inode (usually there is just a single fragment).  We
 119  * need to know when a child frag is delegated to a new MDS, or when
 120  * it is flagged as replicated, so we can direct our requests
 121  * accordingly.
 122  */
 123
 124 /*
 125  * find/create a frag in the tree
 126  */
 127 static struct ceph_inode_frag *__get_or_create_frag(struct ceph_inode_info *ci,
 128                                                     u32 f)
 129 {
 130         struct rb_node **p;
 131         struct rb_node *parent = NULL;
 132         struct ceph_inode_frag *frag;
 133         int c;
 134
 135         p = &ci->i_fragtree.rb_node;
 136         while (*p) {
 137                 parent = *p;
 138                 frag = rb_entry(parent, struct ceph_inode_frag, node);
 139                 c = ceph_frag_compare(f, frag->frag);
 140                 if (c < 0)
 141                         p = &(*p)->rb_left;
 142                 else if (c > 0)
 143                         p = &(*p)->rb_right;
 144                 else
 145                         return frag;
 146         }
 147
 148         frag = kmalloc(sizeof(*frag), GFP_NOFS);
 149         if (!frag)
 150                 return ERR_PTR(-ENOMEM);
 151
 152         frag->frag = f;
 153         frag->split_by = 0;
 154         frag->mds = -1;
 155         frag->ndist = 0;
 156
 157         rb_link_node(&frag->node, parent, p);
 158         rb_insert_color(&frag->node, &ci->i_fragtree);
 159
 160         dout("get_or_create_frag added %llx.%llx frag %x\n",
 161              ceph_vinop(&ci->vfs_inode), f);
 162         return frag;
 163 }
 164
 165 /*
 166  * find a specific frag @f
 167  */
 168 struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci, u32 f)
 169 {
 170         struct rb_node *n = ci->i_fragtree.rb_node;
 171
 172         while (n) {
 173                 struct ceph_inode_frag *frag =
 174                         rb_entry(n, struct ceph_inode_frag, node);
 175                 int c = ceph_frag_compare(f, frag->frag);
 176                 if (c < 0)
 177                         n = n->rb_left;
 178                 else if (c > 0)
 179                         n = n->rb_right;
 180                 else
 181                         return frag;
 182         }
 183         return NULL;
 184 }
 185
 186 /*
 187  * Choose frag containing the given value @v.  If @pfrag is
 188  * specified, copy the frag delegation info to the caller if
 189  * it is present.
 190  */
 191 static u32 __ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
 192                               struct ceph_inode_frag *pfrag, int *found)
 193 {
 194         u32 t = ceph_frag_make(0, 0);
 195         struct ceph_inode_frag *frag;
 196         unsigned nway, i;
 197         u32 n;
 198
 199         if (found)
 200                 *found = 0;
 201
 202         while (1) {
 203                 WARN_ON(!ceph_frag_contains_value(t, v));
 204                 frag = __ceph_find_frag(ci, t);
 205                 if (!frag)
 206                         break; /* t is a leaf */
 207                 if (frag->split_by == 0) {
 208                         if (pfrag)
 209                                 memcpy(pfrag, frag, sizeof(*pfrag));
 210                         if (found)
 211                                 *found = 1;
 212                         break;
 213                 }
 214
 215                 /* choose child */
 216                 nway = 1 << frag->split_by;
 217                 dout("choose_frag(%x) %x splits by %d (%d ways)\n", v, t,
 218                      frag->split_by, nway);
 219                 for (i = 0; i < nway; i++) {
 220                         n = ceph_frag_make_child(t, frag->split_by, i);
 221                         if (ceph_frag_contains_value(n, v)) {
 222                                 t = n;
 223                                 break;
 224                         }
 225                 }
 226                 BUG_ON(i == nway);
 227         }
 228         dout("choose_frag(%x) = %x\n", v, t);
 229
 230         return t;
 231 }
 232
 233 u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
 234                      struct ceph_inode_frag *pfrag, int *found)
 235 {
 236         u32 ret;
 237         mutex_lock(&ci->i_fragtree_mutex);
 238         ret = __ceph_choose_frag(ci, v, pfrag, found);
 239         mutex_unlock(&ci->i_fragtree_mutex);
 240         return ret;
 241 }
 242
 243 /*
 244  * Process dirfrag (delegation) info from the mds.  Include leaf
 245  * fragment in tree ONLY if ndist > 0.  Otherwise, only
 246  * branches/splits are included in i_fragtree)
 247  */
 248 static int ceph_fill_dirfrag(struct inode *inode,
 249                              struct ceph_mds_reply_dirfrag *dirinfo)
 250 {
 251         struct ceph_inode_info *ci = ceph_inode(inode);
 252         struct ceph_inode_frag *frag;
 253         u32 id = le32_to_cpu(dirinfo->frag);
 254         int mds = le32_to_cpu(dirinfo->auth);
 255         int ndist = le32_to_cpu(dirinfo->ndist);
 256         int diri_auth = -1;
 257         int i;
 258         int err = 0;
 259
 260         spin_lock(&ci->i_ceph_lock);
 261         if (ci->i_auth_cap)
 262                 diri_auth = ci->i_auth_cap->mds;
 263         spin_unlock(&ci->i_ceph_lock);
 264
 265         if (mds == -1) /* CDIR_AUTH_PARENT */
 266                 mds = diri_auth;
 267
 268         mutex_lock(&ci->i_fragtree_mutex);
 269         if (ndist == 0 && mds == diri_auth) {
 270                 /* no delegation info needed. */
 271                 frag = __ceph_find_frag(ci, id);
 272                 if (!frag)
 273                         goto out;
 274                 if (frag->split_by == 0) {
 275                         /* tree leaf, remove */
 276                         dout("fill_dirfrag removed %llx.%llx frag %x"
 277                              " (no ref)\n", ceph_vinop(inode), id);
 278                         rb_erase(&frag->node, &ci->i_fragtree);
 279                         kfree(frag);
 280                 } else {
 281                         /* tree branch, keep and clear */
 282                         dout("fill_dirfrag cleared %llx.%llx frag %x"
 283                              " referral\n", ceph_vinop(inode), id);
 284                         frag->mds = -1;
 285                         frag->ndist = 0;
 286                 }
 287                 goto out;
 288         }
 289
 290
 291         /* find/add this frag to store mds delegation info */
 292         frag = __get_or_create_frag(ci, id);
 293         if (IS_ERR(frag)) {
 294                 /* this is not the end of the world; we can continue
 295                    with bad/inaccurate delegation info */
 296                 pr_err("fill_dirfrag ENOMEM on mds ref %llx.%llx fg %x\n",
 297                        ceph_vinop(inode), le32_to_cpu(dirinfo->frag));
 298                 err = -ENOMEM;
 299                 goto out;
 300         }
 301
 302         frag->mds = mds;
 303         frag->ndist = min_t(u32, ndist, CEPH_MAX_DIRFRAG_REP);
 304         for (i = 0; i < frag->ndist; i++)
 305                 frag->dist[i] = le32_to_cpu(dirinfo->dist[i]);
 306         dout("fill_dirfrag %llx.%llx frag %x ndist=%d\n",
 307              ceph_vinop(inode), frag->frag, frag->ndist);
 308
 309 out:
 310         mutex_unlock(&ci->i_fragtree_mutex);
 311         return err;
 312 }
 313
 314 static int frag_tree_split_cmp(const void *l, const void *r)
 315 {
 316         struct ceph_frag_tree_split *ls = (struct ceph_frag_tree_split*)l;
 317         struct ceph_frag_tree_split *rs = (struct ceph_frag_tree_split*)r;
 318         return ceph_frag_compare(le32_to_cpu(ls->frag),
 319                                  le32_to_cpu(rs->frag));
 320 }
 321
 322 static bool is_frag_child(u32 f, struct ceph_inode_frag *frag)
 323 {
 324         if (!frag)
 325                 return f == ceph_frag_make(0, 0);
 326         if (ceph_frag_bits(f) != ceph_frag_bits(frag->frag) + frag->split_by)
 327                 return false;
 328         return ceph_frag_contains_value(frag->frag, ceph_frag_value(f));
 329 }
 330
 331 static int ceph_fill_fragtree(struct inode *inode,
 332                               struct ceph_frag_tree_head *fragtree,
 333                               struct ceph_mds_reply_dirfrag *dirinfo)
 334 {
 335         struct ceph_inode_info *ci = ceph_inode(inode);
 336         struct ceph_inode_frag *frag, *prev_frag = NULL;
 337         struct rb_node *rb_node;
 338         unsigned i, split_by, nsplits;
 339         u32 id;
 340         bool update = false;
 341
 342         mutex_lock(&ci->i_fragtree_mutex);
 343         nsplits = le32_to_cpu(fragtree->nsplits);
 344         if (nsplits != ci->i_fragtree_nsplits) {
 345                 update = true;
 346         } else if (nsplits) {
 347                 i = prandom_u32() % nsplits;
 348                 id = le32_to_cpu(fragtree->splits[i].frag);
 349                 if (!__ceph_find_frag(ci, id))
 350                         update = true;
 351         } else if (!RB_EMPTY_ROOT(&ci->i_fragtree)) {
 352                 rb_node = rb_first(&ci->i_fragtree);
 353                 frag = rb_entry(rb_node, struct ceph_inode_frag, node);
 354                 if (frag->frag != ceph_frag_make(0, 0) || rb_next(rb_node))
 355                         update = true;
 356         }
 357         if (!update && dirinfo) {
 358                 id = le32_to_cpu(dirinfo->frag);
 359                 if (id != __ceph_choose_frag(ci, id, NULL, NULL))
 360                         update = true;
 361         }
 362         if (!update)
 363                 goto out_unlock;
 364
 365         if (nsplits > 1) {
 366                 sort(fragtree->splits, nsplits, sizeof(fragtree->splits[0]),
 367                      frag_tree_split_cmp, NULL);
 368         }
 369
 370         dout("fill_fragtree %llx.%llx\n", ceph_vinop(inode));
 371         rb_node = rb_first(&ci->i_fragtree);
 372         for (i = 0; i < nsplits; i++) {
 373                 id = le32_to_cpu(fragtree->splits[i].frag);
 374                 split_by = le32_to_cpu(fragtree->splits[i].by);
 375                 if (split_by == 0 || ceph_frag_bits(id) + split_by > 24) {
 376                         pr_err("fill_fragtree %llx.%llx invalid split %d/%u, "
 377                                "frag %x split by %d\n", ceph_vinop(inode),
 378                                i, nsplits, id, split_by);
 379                         continue;
 380                 }
 381                 frag = NULL;
 382                 while (rb_node) {
 383                         frag = rb_entry(rb_node, struct ceph_inode_frag, node);
 384                         if (ceph_frag_compare(frag->frag, id) >= 0) {
 385                                 if (frag->frag != id)
 386                                         frag = NULL;
 387                                 else
 388                                         rb_node = rb_next(rb_node);
 389                                 break;
 390                         }
 391                         rb_node = rb_next(rb_node);
 392                         /* delete stale split/leaf node */
 393                         if (frag->split_by > 0 ||
 394                             !is_frag_child(frag->frag, prev_frag)) {
 395                                 rb_erase(&frag->node, &ci->i_fragtree);
 396                                 if (frag->split_by > 0)
 397                                         ci->i_fragtree_nsplits--;
 398                                 kfree(frag);
 399                         }
 400                         frag = NULL;
 401                 }
 402                 if (!frag) {
 403                         frag = __get_or_create_frag(ci, id);
 404                         if (IS_ERR(frag))
 405                                 continue;
 406                 }
 407                 if (frag->split_by == 0)
 408                         ci->i_fragtree_nsplits++;
 409                 frag->split_by = split_by;
 410                 dout(" frag %x split by %d\n", frag->frag, frag->split_by);
 411                 prev_frag = frag;
 412         }
 413         while (rb_node) {
 414                 frag = rb_entry(rb_node, struct ceph_inode_frag, node);
 415                 rb_node = rb_next(rb_node);
 416                 /* delete stale split/leaf node */
 417                 if (frag->split_by > 0 ||
 418                     !is_frag_child(frag->frag, prev_frag)) {
 419                         rb_erase(&frag->node, &ci->i_fragtree);
 420                         if (frag->split_by > 0)
 421                                 ci->i_fragtree_nsplits--;
 422                         kfree(frag);
 423                 }
 424         }
 425 out_unlock:
 426         mutex_unlock(&ci->i_fragtree_mutex);
 427         return 0;
 428 }
 429
 430 /*
 431  * initialize a newly allocated inode.
 432  */
 433 struct inode *ceph_alloc_inode(struct super_block *sb)
 434 {
 435         struct ceph_inode_info *ci;
 436         int i;
 437
 438         ci = kmem_cache_alloc(ceph_inode_cachep, GFP_NOFS);
 439         if (!ci)
 440                 return NULL;
 441
 442         dout("alloc_inode %p\n", &ci->vfs_inode);
 443
 444         spin_lock_init(&ci->i_ceph_lock);
 445
 446         ci->i_version = 0;
 447         ci->i_inline_version = 0;
 448         ci->i_time_warp_seq = 0;
 449         ci->i_ceph_flags = 0;
 450         atomic64_set(&ci->i_ordered_count, 1);
 451         atomic64_set(&ci->i_release_count, 1);
 452         atomic64_set(&ci->i_complete_seq[0], 0);
 453         atomic64_set(&ci->i_complete_seq[1], 0);
 454         ci->i_symlink = NULL;
 455
 456         ci->i_max_bytes = 0;
 457         ci->i_max_files = 0;
 458
 459         memset(&ci->i_dir_layout, 0, sizeof(ci->i_dir_layout));
 460         memset(&ci->i_cached_layout, 0, sizeof(ci->i_cached_layout));
 461         RCU_INIT_POINTER(ci->i_layout.pool_ns, NULL);
 462
 463         ci->i_fragtree = RB_ROOT;
 464         mutex_init(&ci->i_fragtree_mutex);
 465
 466         ci->i_xattrs.blob = NULL;
 467         ci->i_xattrs.prealloc_blob = NULL;
 468         ci->i_xattrs.dirty = false;
 469         ci->i_xattrs.index = RB_ROOT;
 470         ci->i_xattrs.count = 0;
 471         ci->i_xattrs.names_size = 0;
 472         ci->i_xattrs.vals_size = 0;
 473         ci->i_xattrs.version = 0;
 474         ci->i_xattrs.index_version = 0;
 475
 476         ci->i_caps = RB_ROOT;
 477         ci->i_auth_cap = NULL;
 478         ci->i_dirty_caps = 0;
 479         ci->i_flushing_caps = 0;
 480         INIT_LIST_HEAD(&ci->i_dirty_item);
 481         INIT_LIST_HEAD(&ci->i_flushing_item);
 482         ci->i_prealloc_cap_flush = NULL;
 483         INIT_LIST_HEAD(&ci->i_cap_flush_list);
 484         init_waitqueue_head(&ci->i_cap_wq);
 485         ci->i_hold_caps_max = 0;
 486         INIT_LIST_HEAD(&ci->i_cap_delay_list);
 487         INIT_LIST_HEAD(&ci->i_cap_snaps);
 488         ci->i_head_snapc = NULL;
 489         ci->i_snap_caps = 0;
 490
 491         ci->i_last_rd = ci->i_last_wr = jiffies - 3600 * HZ;
 492         for (i = 0; i < CEPH_FILE_MODE_BITS; i++)
 493                 ci->i_nr_by_mode[i] = 0;
 494
 495         mutex_init(&ci->i_truncate_mutex);
 496         ci->i_truncate_seq = 0;
 497         ci->i_truncate_size = 0;
 498         ci->i_truncate_pending = 0;
 499
 500         ci->i_max_size = 0;
 501         ci->i_reported_size = 0;
 502         ci->i_wanted_max_size = 0;
 503         ci->i_requested_max_size = 0;
 504
 505         ci->i_pin_ref = 0;
 506         ci->i_rd_ref = 0;
 507         ci->i_rdcache_ref = 0;
 508         ci->i_wr_ref = 0;
 509         ci->i_wb_ref = 0;
 510         ci->i_fx_ref = 0;
 511         ci->i_wrbuffer_ref = 0;
 512         ci->i_wrbuffer_ref_head = 0;
 513         atomic_set(&ci->i_filelock_ref, 0);
 514         atomic_set(&ci->i_shared_gen, 1);
 515         ci->i_rdcache_gen = 0;
 516         ci->i_rdcache_revoking = 0;
 517
 518         INIT_LIST_HEAD(&ci->i_unsafe_dirops);
 519         INIT_LIST_HEAD(&ci->i_unsafe_iops);
 520         spin_lock_init(&ci->i_unsafe_lock);
 521
 522         ci->i_snap_realm = NULL;
 523         INIT_LIST_HEAD(&ci->i_snap_realm_item);
 524         INIT_LIST_HEAD(&ci->i_snap_flush_item);
 525
 526         INIT_WORK(&ci->i_work, ceph_inode_work);
 527         ci->i_work_mask = 0;
 528         memset(&ci->i_btime, '\0', sizeof(ci->i_btime));
 529
 530         ceph_fscache_inode_init(ci);
 531
 532         return &ci->vfs_inode;
 533 }
 534
 535 void ceph_free_inode(struct inode *inode)
 536 {
 537         struct ceph_inode_info *ci = ceph_inode(inode);
 538
 539         kfree(ci->i_symlink);
 540         kmem_cache_free(ceph_inode_cachep, ci);
 541 }
 542
 543 void ceph_evict_inode(struct inode *inode)
 544 {
 545         struct ceph_inode_info *ci = ceph_inode(inode);
 546         struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb);
 547         struct ceph_inode_frag *frag;
 548         struct rb_node *n;
 549
 550         dout("evict_inode %p ino %llx.%llx\n", inode, ceph_vinop(inode));
 551
 552         percpu_counter_dec(&mdsc->metric.total_inodes);
 553
 554         truncate_inode_pages_final(&inode->i_data);
 555         clear_inode(inode);
 556
 557         ceph_fscache_unregister_inode_cookie(ci);
 558
 559         __ceph_remove_caps(ci);
 560
 561         if (__ceph_has_any_quota(ci))
 562                 ceph_adjust_quota_realms_count(inode, false);
 563
 564         /*
 565          * we may still have a snap_realm reference if there are stray
 566          * caps in i_snap_caps.
 567          */
 568         if (ci->i_snap_realm) {
 569                 if (ceph_snap(inode) == CEPH_NOSNAP) {
 570                         struct ceph_snap_realm *realm = ci->i_snap_realm;
 571                         dout(" dropping residual ref to snap realm %p\n",
 572                              realm);
 573                         spin_lock(&realm->inodes_with_caps_lock);
 574                         list_del_init(&ci->i_snap_realm_item);
 575                         ci->i_snap_realm = NULL;
 576                         if (realm->ino == ci->i_vino.ino)
 577                                 realm->inode = NULL;
 578                         spin_unlock(&realm->inodes_with_caps_lock);
 579                         ceph_put_snap_realm(mdsc, realm);
 580                 } else {
 581                         ceph_put_snapid_map(mdsc, ci->i_snapid_map);
 582                         ci->i_snap_realm = NULL;
 583                 }
 584         }
 585
 586         while ((n = rb_first(&ci->i_fragtree)) != NULL) {
 587                 frag = rb_entry(n, struct ceph_inode_frag, node);
 588                 rb_erase(n, &ci->i_fragtree);
 589                 kfree(frag);
 590         }
 591         ci->i_fragtree_nsplits = 0;
 592
 593         __ceph_destroy_xattrs(ci);
 594         if (ci->i_xattrs.blob)
 595                 ceph_buffer_put(ci->i_xattrs.blob);
 596         if (ci->i_xattrs.prealloc_blob)
 597                 ceph_buffer_put(ci->i_xattrs.prealloc_blob);
 598
 599         ceph_put_string(rcu_dereference_raw(ci->i_layout.pool_ns));
 600         ceph_put_string(rcu_dereference_raw(ci->i_cached_layout.pool_ns));
 601 }
 602
 603 static inline blkcnt_t calc_inode_blocks(u64 size)
 604 {
 605         return (size + (1<<9) - 1) >> 9;
 606 }
 607
 608 /*
 609  * Helpers to fill in size, ctime, mtime, and atime.  We have to be
 610  * careful because either the client or MDS may have more up to date
 611  * info, depending on which capabilities are held, and whether
 612  * time_warp_seq or truncate_seq have increased.  (Ordinarily, mtime
 613  * and size are monotonically increasing, except when utimes() or
 614  * truncate() increments the corresponding _seq values.)
 615  */
 616 int ceph_fill_file_size(struct inode *inode, int issued,
 617                         u32 truncate_seq, u64 truncate_size, u64 size)
 618 {
 619         struct ceph_inode_info *ci = ceph_inode(inode);
 620         int queue_trunc = 0;
 621
 622         if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) > 0 ||
 623             (truncate_seq == ci->i_truncate_seq && size > inode->i_size)) {
 624                 dout("size %lld -> %llu\n", inode->i_size, size);
 625                 if (size > 0 && S_ISDIR(inode->i_mode)) {
 626                         pr_err("fill_file_size non-zero size for directory\n");
 627                         size = 0;
 628                 }
 629                 i_size_write(inode, size);
 630                 inode->i_blocks = calc_inode_blocks(size);
 631                 ci->i_reported_size = size;
 632                 if (truncate_seq != ci->i_truncate_seq) {
 633                         dout("truncate_seq %u -> %u\n",
 634                              ci->i_truncate_seq, truncate_seq);
 635                         ci->i_truncate_seq = truncate_seq;
 636
 637                         /* the MDS should have revoked these caps */
 638                         WARN_ON_ONCE(issued & (CEPH_CAP_FILE_EXCL |
 639                                                CEPH_CAP_FILE_RD |
 640                                                CEPH_CAP_FILE_WR |
 641                                                CEPH_CAP_FILE_LAZYIO));
 642                         /*
 643                          * If we hold relevant caps, or in the case where we're
 644                          * not the only client referencing this file and we
 645                          * don't hold those caps, then we need to check whether
 646                          * the file is either opened or mmaped
 647                          */
 648                         if ((issued & (CEPH_CAP_FILE_CACHE|
 649                                        CEPH_CAP_FILE_BUFFER)) ||
 650                             mapping_mapped(inode->i_mapping) ||
 651                             __ceph_is_file_opened(ci)) {
 652                                 ci->i_truncate_pending++;
 653                                 queue_trunc = 1;
 654                         }
 655                 }
 656         }
 657         if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) >= 0 &&
 658             ci->i_truncate_size != truncate_size) {
 659                 dout("truncate_size %lld -> %llu\n", ci->i_truncate_size,
 660                      truncate_size);
 661                 ci->i_truncate_size = truncate_size;
 662         }
 663
 664         if (queue_trunc)
 665                 ceph_fscache_invalidate(inode);
 666
 667         return queue_trunc;
 668 }
 669
 670 void ceph_fill_file_time(struct inode *inode, int issued,
 671                          u64 time_warp_seq, struct timespec64 *ctime,
 672                          struct timespec64 *mtime, struct timespec64 *atime)
 673 {
 674         struct ceph_inode_info *ci = ceph_inode(inode);
 675         int warn = 0;
 676
 677         if (issued & (CEPH_CAP_FILE_EXCL|
 678                       CEPH_CAP_FILE_WR|
 679                       CEPH_CAP_FILE_BUFFER|
 680                       CEPH_CAP_AUTH_EXCL|
 681                       CEPH_CAP_XATTR_EXCL)) {
 682                 if (ci->i_version == 0 ||
 683                     timespec64_compare(ctime, &inode->i_ctime) > 0) {
 684                         dout("ctime %lld.%09ld -> %lld.%09ld inc w/ cap\n",
 685                              inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
 686                              ctime->tv_sec, ctime->tv_nsec);
 687                         inode->i_ctime = *ctime;
 688                 }
 689                 if (ci->i_version == 0 ||
 690                     ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) > 0) {
 691                         /* the MDS did a utimes() */
 692                         dout("mtime %lld.%09ld -> %lld.%09ld "
 693                              "tw %d -> %d\n",
 694                              inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
 695                              mtime->tv_sec, mtime->tv_nsec,
 696                              ci->i_time_warp_seq, (int)time_warp_seq);
 697
 698                         inode->i_mtime = *mtime;
 699                         inode->i_atime = *atime;
 700                         ci->i_time_warp_seq = time_warp_seq;
 701                 } else if (time_warp_seq == ci->i_time_warp_seq) {
 702                         /* nobody did utimes(); take the max */
 703                         if (timespec64_compare(mtime, &inode->i_mtime) > 0) {
 704                                 dout("mtime %lld.%09ld -> %lld.%09ld inc\n",
 705                                      inode->i_mtime.tv_sec,
 706                                      inode->i_mtime.tv_nsec,
 707                                      mtime->tv_sec, mtime->tv_nsec);
 708                                 inode->i_mtime = *mtime;
 709                         }
 710                         if (timespec64_compare(atime, &inode->i_atime) > 0) {
 711                                 dout("atime %lld.%09ld -> %lld.%09ld inc\n",
 712                                      inode->i_atime.tv_sec,
 713                                      inode->i_atime.tv_nsec,
 714                                      atime->tv_sec, atime->tv_nsec);
 715                                 inode->i_atime = *atime;
 716                         }
 717                 } else if (issued & CEPH_CAP_FILE_EXCL) {
 718                         /* we did a utimes(); ignore mds values */
 719                 } else {
 720                         warn = 1;
 721                 }
 722         } else {
 723                 /* we have no write|excl caps; whatever the MDS says is true */
 724                 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) >= 0) {
 725                         inode->i_ctime = *ctime;
 726                         inode->i_mtime = *mtime;
 727                         inode->i_atime = *atime;
 728                         ci->i_time_warp_seq = time_warp_seq;
 729                 } else {
 730                         warn = 1;
 731                 }
 732         }
 733         if (warn) /* time_warp_seq shouldn't go backwards */
 734                 dout("%p mds time_warp_seq %llu < %u\n",
 735                      inode, time_warp_seq, ci->i_time_warp_seq);
 736 }
 737
 738 /*
 739  * Populate an inode based on info from mds.  May be called on new or
 740  * existing inodes.
 741  */
 742 int ceph_fill_inode(struct inode *inode, struct page *locked_page,
 743                     struct ceph_mds_reply_info_in *iinfo,
 744                     struct ceph_mds_reply_dirfrag *dirinfo,
 745                     struct ceph_mds_session *session, int cap_fmode,
 746                     struct ceph_cap_reservation *caps_reservation)
 747 {
 748         struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb);
 749         struct ceph_mds_reply_inode *info = iinfo->in;
 750         struct ceph_inode_info *ci = ceph_inode(inode);
 751         int issued, new_issued, info_caps;
 752         struct timespec64 mtime, atime, ctime;
 753         struct ceph_buffer *xattr_blob = NULL;
 754         struct ceph_buffer *old_blob = NULL;
 755         struct ceph_string *pool_ns = NULL;
 756         struct ceph_cap *new_cap = NULL;
 757         int err = 0;
 758         bool wake = false;
 759         bool queue_trunc = false;
 760         bool new_version = false;
 761         bool fill_inline = false;
 762
 763         lockdep_assert_held(&mdsc->snap_rwsem);
 764
 765         dout("%s %p ino %llx.%llx v %llu had %llu\n", __func__,
 766              inode, ceph_vinop(inode), le64_to_cpu(info->version),
 767              ci->i_version);
 768
 769         info_caps = le32_to_cpu(info->cap.caps);
 770
 771         /* prealloc new cap struct */
 772         if (info_caps && ceph_snap(inode) == CEPH_NOSNAP) {
 773                 new_cap = ceph_get_cap(mdsc, caps_reservation);
 774                 if (!new_cap)
 775                         return -ENOMEM;
 776         }
 777
 778         /*
 779          * prealloc xattr data, if it looks like we'll need it.  only
 780          * if len > 4 (meaning there are actually xattrs; the first 4
 781          * bytes are the xattr count).
 782          */
 783         if (iinfo->xattr_len > 4) {
 784                 xattr_blob = ceph_buffer_new(iinfo->xattr_len, GFP_NOFS);
 785                 if (!xattr_blob)
 786                         pr_err("%s ENOMEM xattr blob %d bytes\n", __func__,
 787                                iinfo->xattr_len);
 788         }
 789
 790         if (iinfo->pool_ns_len > 0)
 791                 pool_ns = ceph_find_or_create_string(iinfo->pool_ns_data,
 792                                                      iinfo->pool_ns_len);
 793
 794         if (ceph_snap(inode) != CEPH_NOSNAP && !ci->i_snapid_map)
 795                 ci->i_snapid_map = ceph_get_snapid_map(mdsc, ceph_snap(inode));
 796
 797         spin_lock(&ci->i_ceph_lock);
 798
 799         /*
 800          * provided version will be odd if inode value is projected,
 801          * even if stable.  skip the update if we have newer stable
 802          * info (ours>=theirs, e.g. due to racing mds replies), unless
 803          * we are getting projected (unstable) info (in which case the
 804          * version is odd, and we want ours>theirs).
 805          *   us   them
 806          *   2    2     skip
 807          *   3    2     skip
 808          *   3    3     update
 809          */
 810         if (ci->i_version == 0 ||
 811             ((info->cap.flags & CEPH_CAP_FLAG_AUTH) &&
 812              le64_to_cpu(info->version) > (ci->i_version & ~1)))
 813                 new_version = true;
 814
 815         /* Update change_attribute */
 816         inode_set_max_iversion_raw(inode, iinfo->change_attr);
 817
 818         __ceph_caps_issued(ci, &issued);
 819         issued |= __ceph_caps_dirty(ci);
 820         new_issued = ~issued & info_caps;
 821
 822         /* update inode */
 823         inode->i_rdev = le32_to_cpu(info->rdev);
 824         /* directories have fl_stripe_unit set to zero */
 825         if (le32_to_cpu(info->layout.fl_stripe_unit))
 826                 inode->i_blkbits =
 827                         fls(le32_to_cpu(info->layout.fl_stripe_unit)) - 1;
 828         else
 829                 inode->i_blkbits = CEPH_BLOCK_SHIFT;
 830
 831         __ceph_update_quota(ci, iinfo->max_bytes, iinfo->max_files);
 832
 833         if ((new_version || (new_issued & CEPH_CAP_AUTH_SHARED)) &&
 834             (issued & CEPH_CAP_AUTH_EXCL) == 0) {
 835                 inode->i_mode = le32_to_cpu(info->mode);
 836                 inode->i_uid = make_kuid(&init_user_ns, le32_to_cpu(info->uid));
 837                 inode->i_gid = make_kgid(&init_user_ns, le32_to_cpu(info->gid));
 838                 dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode,
 839                      from_kuid(&init_user_ns, inode->i_uid),
 840                      from_kgid(&init_user_ns, inode->i_gid));
 841                 ceph_decode_timespec64(&ci->i_btime, &iinfo->btime);
 842                 ceph_decode_timespec64(&ci->i_snap_btime, &iinfo->snap_btime);
 843         }
 844
 845         if ((new_version || (new_issued & CEPH_CAP_LINK_SHARED)) &&
 846             (issued & CEPH_CAP_LINK_EXCL) == 0)
 847                 set_nlink(inode, le32_to_cpu(info->nlink));
 848
 849         if (new_version || (new_issued & CEPH_CAP_ANY_RD)) {
 850                 /* be careful with mtime, atime, size */
 851                 ceph_decode_timespec64(&atime, &info->atime);
 852                 ceph_decode_timespec64(&mtime, &info->mtime);
 853                 ceph_decode_timespec64(&ctime, &info->ctime);
 854                 ceph_fill_file_time(inode, issued,
 855                                 le32_to_cpu(info->time_warp_seq),
 856                                 &ctime, &mtime, &atime);
 857         }
 858
 859         if (new_version || (info_caps & CEPH_CAP_FILE_SHARED)) {
 860                 ci->i_files = le64_to_cpu(info->files);
 861                 ci->i_subdirs = le64_to_cpu(info->subdirs);
 862         }
 863
 864         if (new_version ||
 865             (new_issued & (CEPH_CAP_ANY_FILE_RD | CEPH_CAP_ANY_FILE_WR))) {
 866                 s64 old_pool = ci->i_layout.pool_id;
 867                 struct ceph_string *old_ns;
 868
 869                 ceph_file_layout_from_legacy(&ci->i_layout, &info->layout);
 870                 old_ns = rcu_dereference_protected(ci->i_layout.pool_ns,
 871                                         lockdep_is_held(&ci->i_ceph_lock));
 872                 rcu_assign_pointer(ci->i_layout.pool_ns, pool_ns);
 873
 874                 if (ci->i_layout.pool_id != old_pool || pool_ns != old_ns)
 875                         ci->i_ceph_flags &= ~CEPH_I_POOL_PERM;
 876
 877                 pool_ns = old_ns;
 878
 879                 queue_trunc = ceph_fill_file_size(inode, issued,
 880                                         le32_to_cpu(info->truncate_seq),
 881                                         le64_to_cpu(info->truncate_size),
 882                                         le64_to_cpu(info->size));
 883                 /* only update max_size on auth cap */
 884                 if ((info->cap.flags & CEPH_CAP_FLAG_AUTH) &&
 885                     ci->i_max_size != le64_to_cpu(info->max_size)) {
 886                         dout("max_size %lld -> %llu\n", ci->i_max_size,
 887                                         le64_to_cpu(info->max_size));
 888                         ci->i_max_size = le64_to_cpu(info->max_size);
 889                 }
 890         }
 891
 892         /* layout and rstat are not tracked by capability, update them if
 893          * the inode info is from auth mds */
 894         if (new_version || (info->cap.flags & CEPH_CAP_FLAG_AUTH)) {
 895                 if (S_ISDIR(inode->i_mode)) {
 896                         ci->i_dir_layout = iinfo->dir_layout;
 897                         ci->i_rbytes = le64_to_cpu(info->rbytes);
 898                         ci->i_rfiles = le64_to_cpu(info->rfiles);
 899                         ci->i_rsubdirs = le64_to_cpu(info->rsubdirs);
 900                         ci->i_dir_pin = iinfo->dir_pin;
 901                         ceph_decode_timespec64(&ci->i_rctime, &info->rctime);
 902                 }
 903         }
 904
 905         /* xattrs */
 906         /* note that if i_xattrs.len <= 4, i_xattrs.data will still be NULL. */
 907         if ((ci->i_xattrs.version == 0 || !(issued & CEPH_CAP_XATTR_EXCL))  &&
 908             le64_to_cpu(info->xattr_version) > ci->i_xattrs.version) {
 909                 if (ci->i_xattrs.blob)
 910                         old_blob = ci->i_xattrs.blob;
 911                 ci->i_xattrs.blob = xattr_blob;
 912                 if (xattr_blob)
 913                         memcpy(ci->i_xattrs.blob->vec.iov_base,
 914                                iinfo->xattr_data, iinfo->xattr_len);
 915                 ci->i_xattrs.version = le64_to_cpu(info->xattr_version);
 916                 ceph_forget_all_cached_acls(inode);
 917                 ceph_security_invalidate_secctx(inode);
 918                 xattr_blob = NULL;
 919         }
 920
 921         /* finally update i_version */
 922         if (le64_to_cpu(info->version) > ci->i_version)
 923                 ci->i_version = le64_to_cpu(info->version);
 924
 925         inode->i_mapping->a_ops = &ceph_aops;
 926
 927         switch (inode->i_mode & S_IFMT) {
 928         case S_IFIFO:
 929         case S_IFBLK:
 930         case S_IFCHR:
 931         case S_IFSOCK:
 932                 inode->i_blkbits = PAGE_SHIFT;
 933                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
 934                 inode->i_op = &ceph_file_iops;
 935                 break;
 936         case S_IFREG:
 937                 inode->i_op = &ceph_file_iops;
 938                 inode->i_fop = &ceph_file_fops;
 939                 break;
 940         case S_IFLNK:
 941                 inode->i_op = &ceph_symlink_iops;
 942                 if (!ci->i_symlink) {
 943                         u32 symlen = iinfo->symlink_len;
 944                         char *sym;
 945
 946                         spin_unlock(&ci->i_ceph_lock);
 947
 948                         if (symlen != i_size_read(inode)) {
 949                                 pr_err("%s %llx.%llx BAD symlink "
 950                                         "size %lld\n", __func__,
 951                                         ceph_vinop(inode),
 952                                         i_size_read(inode));
 953                                 i_size_write(inode, symlen);
 954                                 inode->i_blocks = calc_inode_blocks(symlen);
 955                         }
 956
 957                         err = -ENOMEM;
 958                         sym = kstrndup(iinfo->symlink, symlen, GFP_NOFS);
 959                         if (!sym)
 960                                 goto out;
 961
 962                         spin_lock(&ci->i_ceph_lock);
 963                         if (!ci->i_symlink)
 964                                 ci->i_symlink = sym;
 965                         else
 966                                 kfree(sym); /* lost a race */
 967                 }
 968                 inode->i_link = ci->i_symlink;
 969                 break;
 970         case S_IFDIR:
 971                 inode->i_op = &ceph_dir_iops;
 972                 inode->i_fop = &ceph_dir_fops;
 973                 break;
 974         default:
 975                 pr_err("%s %llx.%llx BAD mode 0%o\n", __func__,
 976                        ceph_vinop(inode), inode->i_mode);
 977         }
 978
 979         /* were we issued a capability? */
 980         if (info_caps) {
 981                 if (ceph_snap(inode) == CEPH_NOSNAP) {
 982                         ceph_add_cap(inode, session,
 983                                      le64_to_cpu(info->cap.cap_id),
 984                                      info_caps,
 985                                      le32_to_cpu(info->cap.wanted),
 986                                      le32_to_cpu(info->cap.seq),
 987                                      le32_to_cpu(info->cap.mseq),
 988                                      le64_to_cpu(info->cap.realm),
 989                                      info->cap.flags, &new_cap);
 990
 991                         /* set dir completion flag? */
 992                         if (S_ISDIR(inode->i_mode) &&
 993                             ci->i_files == 0 && ci->i_subdirs == 0 &&
 994                             (info_caps & CEPH_CAP_FILE_SHARED) &&
 995                             (issued & CEPH_CAP_FILE_EXCL) == 0 &&
 996                             !__ceph_dir_is_complete(ci)) {
 997                                 dout(" marking %p complete (empty)\n", inode);
 998                                 i_size_write(inode, 0);
 999                                 __ceph_dir_set_complete(ci,
1000                                         atomic64_read(&ci->i_release_count),
1001                                         atomic64_read(&ci->i_ordered_count));
1002                         }
1003
1004                         wake = true;
1005                 } else {
1006                         dout(" %p got snap_caps %s\n", inode,
1007                              ceph_cap_string(info_caps));
1008                         ci->i_snap_caps |= info_caps;
1009                 }
1010         }
1011
1012         if (iinfo->inline_version > 0 &&
1013             iinfo->inline_version >= ci->i_inline_version) {
1014                 int cache_caps = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO;
1015                 ci->i_inline_version = iinfo->inline_version;
1016                 if (ci->i_inline_version != CEPH_INLINE_NONE &&
1017                     (locked_page || (info_caps & cache_caps)))
1018                         fill_inline = true;
1019         }
1020
1021         if (cap_fmode >= 0) {
1022                 if (!info_caps)
1023                         pr_warn("mds issued no caps on %llx.%llx\n",
1024                                 ceph_vinop(inode));
1025                 __ceph_touch_fmode(ci, mdsc, cap_fmode);
1026         }
1027
1028         spin_unlock(&ci->i_ceph_lock);
1029
1030         if (fill_inline)
1031                 ceph_fill_inline_data(inode, locked_page,
1032                                       iinfo->inline_data, iinfo->inline_len);
1033
1034         if (wake)
1035                 wake_up_all(&ci->i_cap_wq);
1036
1037         /* queue truncate if we saw i_size decrease */
1038         if (queue_trunc)
1039                 ceph_queue_vmtruncate(inode);
1040
1041         /* populate frag tree */
1042         if (S_ISDIR(inode->i_mode))
1043                 ceph_fill_fragtree(inode, &info->fragtree, dirinfo);
1044
1045         /* update delegation info? */
1046         if (dirinfo)
1047                 ceph_fill_dirfrag(inode, dirinfo);
1048
1049         err = 0;
1050 out:
1051         if (new_cap)
1052                 ceph_put_cap(mdsc, new_cap);
1053         ceph_buffer_put(old_blob);
1054         ceph_buffer_put(xattr_blob);
1055         ceph_put_string(pool_ns);
1056         return err;
1057 }
1058
1059 /*
1060  * caller should hold session s_mutex and dentry->d_lock.
1061  */
1062 static void __update_dentry_lease(struct inode *dir, struct dentry *dentry,
1063                                   struct ceph_mds_reply_lease *lease,
1064                                   struct ceph_mds_session *session,
1065                                   unsigned long from_time,
1066                                   struct ceph_mds_session **old_lease_session)
1067 {
1068         struct ceph_dentry_info *di = ceph_dentry(dentry);
1069         unsigned mask = le16_to_cpu(lease->mask);
1070         long unsigned duration = le32_to_cpu(lease->duration_ms);
1071         long unsigned ttl = from_time + (duration * HZ) / 1000;
1072         long unsigned half_ttl = from_time + (duration * HZ / 2) / 1000;
1073
1074         dout("update_dentry_lease %p duration %lu ms ttl %lu\n",
1075              dentry, duration, ttl);
1076
1077         /* only track leases on regular dentries */
1078         if (ceph_snap(dir) != CEPH_NOSNAP)
1079                 return;
1080
1081         if (mask & CEPH_LEASE_PRIMARY_LINK)
1082                 di->flags |= CEPH_DENTRY_PRIMARY_LINK;
1083         else
1084                 di->flags &= ~CEPH_DENTRY_PRIMARY_LINK;
1085
1086         di->lease_shared_gen = atomic_read(&ceph_inode(dir)->i_shared_gen);
1087         if (!(mask & CEPH_LEASE_VALID)) {
1088                 __ceph_dentry_dir_lease_touch(di);
1089                 return;
1090         }
1091
1092         if (di->lease_gen == session->s_cap_gen &&
1093             time_before(ttl, di->time))
1094                 return;  /* we already have a newer lease. */
1095
1096         if (di->lease_session && di->lease_session != session) {
1097                 *old_lease_session = di->lease_session;
1098                 di->lease_session = NULL;
1099         }
1100
1101         if (!di->lease_session)
1102                 di->lease_session = ceph_get_mds_session(session);
1103         di->lease_gen = session->s_cap_gen;
1104         di->lease_seq = le32_to_cpu(lease->seq);
1105         di->lease_renew_after = half_ttl;
1106         di->lease_renew_from = 0;
1107         di->time = ttl;
1108
1109         __ceph_dentry_lease_touch(di);
1110 }
1111
1112 static inline void update_dentry_lease(struct inode *dir, struct dentry *dentry,
1113                                         struct ceph_mds_reply_lease *lease,
1114                                         struct ceph_mds_session *session,
1115                                         unsigned long from_time)
1116 {
1117         struct ceph_mds_session *old_lease_session = NULL;
1118         spin_lock(&dentry->d_lock);
1119         __update_dentry_lease(dir, dentry, lease, session, from_time,
1120                               &old_lease_session);
1121         spin_unlock(&dentry->d_lock);
1122         ceph_put_mds_session(old_lease_session);
1123 }
1124
1125 /*
1126  * update dentry lease without having parent inode locked
1127  */
1128 static void update_dentry_lease_careful(struct dentry *dentry,
1129                                         struct ceph_mds_reply_lease *lease,
1130                                         struct ceph_mds_session *session,
1131                                         unsigned long from_time,
1132                                         char *dname, u32 dname_len,
1133                                         struct ceph_vino *pdvino,
1134                                         struct ceph_vino *ptvino)
1135
1136 {
1137         struct inode *dir;
1138         struct ceph_mds_session *old_lease_session = NULL;
1139
1140         spin_lock(&dentry->d_lock);
1141         /* make sure dentry's name matches target */
1142         if (dentry->d_name.len != dname_len ||
1143             memcmp(dentry->d_name.name, dname, dname_len))
1144                 goto out_unlock;
1145
1146         dir = d_inode(dentry->d_parent);
1147         /* make sure parent matches dvino */
1148         if (!ceph_ino_compare(dir, pdvino))
1149                 goto out_unlock;
1150
1151         /* make sure dentry's inode matches target. NULL ptvino means that
1152          * we expect a negative dentry */
1153         if (ptvino) {
1154                 if (d_really_is_negative(dentry))
1155                         goto out_unlock;
1156                 if (!ceph_ino_compare(d_inode(dentry), ptvino))
1157                         goto out_unlock;
1158         } else {
1159                 if (d_really_is_positive(dentry))
1160                         goto out_unlock;
1161         }
1162
1163         __update_dentry_lease(dir, dentry, lease, session,
1164                               from_time, &old_lease_session);
1165 out_unlock:
1166         spin_unlock(&dentry->d_lock);
1167         ceph_put_mds_session(old_lease_session);
1168 }
1169
1170 /*
1171  * splice a dentry to an inode.
1172  * caller must hold directory i_mutex for this to be safe.
1173  */
1174 static int splice_dentry(struct dentry **pdn, struct inode *in)
1175 {
1176         struct dentry *dn = *pdn;
1177         struct dentry *realdn;
1178
1179         BUG_ON(d_inode(dn));
1180
1181         if (S_ISDIR(in->i_mode)) {
1182                 /* If inode is directory, d_splice_alias() below will remove
1183                  * 'realdn' from its origin parent. We need to ensure that
1184                  * origin parent's readdir cache will not reference 'realdn'
1185                  */
1186                 realdn = d_find_any_alias(in);
1187                 if (realdn) {
1188                         struct ceph_dentry_info *di = ceph_dentry(realdn);
1189                         spin_lock(&realdn->d_lock);
1190
1191                         realdn->d_op->d_prune(realdn);
1192
1193                         di->time = jiffies;
1194                         di->lease_shared_gen = 0;
1195                         di->offset = 0;
1196
1197                         spin_unlock(&realdn->d_lock);
1198                         dput(realdn);
1199                 }
1200         }
1201
1202         /* dn must be unhashed */
1203         if (!d_unhashed(dn))
1204                 d_drop(dn);
1205         realdn = d_splice_alias(in, dn);
1206         if (IS_ERR(realdn)) {
1207                 pr_err("splice_dentry error %ld %p inode %p ino %llx.%llx\n",
1208                        PTR_ERR(realdn), dn, in, ceph_vinop(in));
1209                 return PTR_ERR(realdn);
1210         }
1211
1212         if (realdn) {
1213                 dout("dn %p (%d) spliced with %p (%d) "
1214                      "inode %p ino %llx.%llx\n",
1215                      dn, d_count(dn),
1216                      realdn, d_count(realdn),
1217                      d_inode(realdn), ceph_vinop(d_inode(realdn)));
1218                 dput(dn);
1219                 *pdn = realdn;
1220         } else {
1221                 BUG_ON(!ceph_dentry(dn));
1222                 dout("dn %p attached to %p ino %llx.%llx\n",
1223                      dn, d_inode(dn), ceph_vinop(d_inode(dn)));
1224         }
1225         return 0;
1226 }
1227
1228 /*
1229  * Incorporate results into the local cache.  This is either just
1230  * one inode, or a directory, dentry, and possibly linked-to inode (e.g.,
1231  * after a lookup).
1232  *
1233  * A reply may contain
1234  *         a directory inode along with a dentry.
1235  *  and/or a target inode
1236  *
1237  * Called with snap_rwsem (read).
1238  */
1239 int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req)
1240 {
1241         struct ceph_mds_session *session = req->r_session;
1242         struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1243         struct inode *in = NULL;
1244         struct ceph_vino tvino, dvino;
1245         struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
1246         int err = 0;
1247
1248         dout("fill_trace %p is_dentry %d is_target %d\n", req,
1249              rinfo->head->is_dentry, rinfo->head->is_target);
1250
1251         if (!rinfo->head->is_target && !rinfo->head->is_dentry) {
1252                 dout("fill_trace reply is empty!\n");
1253                 if (rinfo->head->result == 0 && req->r_parent)
1254                         ceph_invalidate_dir_request(req);
1255                 return 0;
1256         }
1257
1258         if (rinfo->head->is_dentry) {
1259                 struct inode *dir = req->r_parent;
1260
1261                 if (dir) {
1262                         err = ceph_fill_inode(dir, NULL, &rinfo->diri,
1263                                               rinfo->dirfrag, session, -1,
1264                                               &req->r_caps_reservation);
1265                         if (err < 0)
1266                                 goto done;
1267                 } else {
1268                         WARN_ON_ONCE(1);
1269                 }
1270
1271                 if (dir && req->r_op == CEPH_MDS_OP_LOOKUPNAME &&
1272                     test_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags) &&
1273                     !test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
1274                         struct qstr dname;
1275                         struct dentry *dn, *parent;
1276
1277                         BUG_ON(!rinfo->head->is_target);
1278                         BUG_ON(req->r_dentry);
1279
1280                         parent = d_find_any_alias(dir);
1281                         BUG_ON(!parent);
1282
1283                         dname.name = rinfo->dname;
1284                         dname.len = rinfo->dname_len;
1285                         dname.hash = full_name_hash(parent, dname.name, dname.len);
1286                         tvino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1287                         tvino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1288 retry_lookup:
1289                         dn = d_lookup(parent, &dname);
1290                         dout("d_lookup on parent=%p name=%.*s got %p\n",
1291                              parent, dname.len, dname.name, dn);
1292
1293                         if (!dn) {
1294                                 dn = d_alloc(parent, &dname);
1295                                 dout("d_alloc %p '%.*s' = %p\n", parent,
1296                                      dname.len, dname.name, dn);
1297                                 if (!dn) {
1298                                         dput(parent);
1299                                         err = -ENOMEM;
1300                                         goto done;
1301                                 }
1302                                 err = 0;
1303                         } else if (d_really_is_positive(dn) &&
1304                                    (ceph_ino(d_inode(dn)) != tvino.ino ||
1305                                     ceph_snap(d_inode(dn)) != tvino.snap)) {
1306                                 dout(" dn %p points to wrong inode %p\n",
1307                                      dn, d_inode(dn));
1308                                 ceph_dir_clear_ordered(dir);
1309                                 d_delete(dn);
1310                                 dput(dn);
1311                                 goto retry_lookup;
1312                         }
1313
1314                         req->r_dentry = dn;
1315                         dput(parent);
1316                 }
1317         }
1318
1319         if (rinfo->head->is_target) {
1320                 tvino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1321                 tvino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1322
1323                 in = ceph_get_inode(sb, tvino);
1324                 if (IS_ERR(in)) {
1325                         err = PTR_ERR(in);
1326                         goto done;
1327                 }
1328
1329                 err = ceph_fill_inode(in, req->r_locked_page, &rinfo->targeti,
1330                                 NULL, session,
1331                                 (!test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags) &&
1332                                  !test_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags) &&
1333                                  rinfo->head->result == 0) ?  req->r_fmode : -1,
1334                                 &req->r_caps_reservation);
1335                 if (err < 0) {
1336                         pr_err("ceph_fill_inode badness %p %llx.%llx\n",
1337                                 in, ceph_vinop(in));
1338                         if (in->i_state & I_NEW)
1339                                 discard_new_inode(in);
1340                         else
1341                                 iput(in);
1342                         goto done;
1343                 }
1344                 req->r_target_inode = in;
1345                 if (in->i_state & I_NEW)
1346                         unlock_new_inode(in);
1347         }
1348
1349         /*
1350          * ignore null lease/binding on snapdir ENOENT, or else we
1351          * will have trouble splicing in the virtual snapdir later
1352          */
1353         if (rinfo->head->is_dentry &&
1354             !test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags) &&
1355             test_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags) &&
1356             (rinfo->head->is_target || strncmp(req->r_dentry->d_name.name,
1357                                                fsc->mount_options->snapdir_name,
1358                                                req->r_dentry->d_name.len))) {
1359                 /*
1360                  * lookup link rename   : null -> possibly existing inode
1361                  * mknod symlink mkdir  : null -> new inode
1362                  * unlink               : linked -> null
1363                  */
1364                 struct inode *dir = req->r_parent;
1365                 struct dentry *dn = req->r_dentry;
1366                 bool have_dir_cap, have_lease;
1367
1368                 BUG_ON(!dn);
1369                 BUG_ON(!dir);
1370                 BUG_ON(d_inode(dn->d_parent) != dir);
1371
1372                 dvino.ino = le64_to_cpu(rinfo->diri.in->ino);
1373                 dvino.snap = le64_to_cpu(rinfo->diri.in->snapid);
1374
1375                 BUG_ON(ceph_ino(dir) != dvino.ino);
1376                 BUG_ON(ceph_snap(dir) != dvino.snap);
1377
1378                 /* do we have a lease on the whole dir? */
1379                 have_dir_cap =
1380                         (le32_to_cpu(rinfo->diri.in->cap.caps) &
1381                          CEPH_CAP_FILE_SHARED);
1382
1383                 /* do we have a dn lease? */
1384                 have_lease = have_dir_cap ||
1385                         le32_to_cpu(rinfo->dlease->duration_ms);
1386                 if (!have_lease)
1387                         dout("fill_trace  no dentry lease or dir cap\n");
1388
1389                 /* rename? */
1390                 if (req->r_old_dentry && req->r_op == CEPH_MDS_OP_RENAME) {
1391                         struct inode *olddir = req->r_old_dentry_dir;
1392                         BUG_ON(!olddir);
1393
1394                         dout(" src %p '%pd' dst %p '%pd'\n",
1395                              req->r_old_dentry,
1396                              req->r_old_dentry,
1397                              dn, dn);
1398                         dout("fill_trace doing d_move %p -> %p\n",
1399                              req->r_old_dentry, dn);
1400
1401                         /* d_move screws up sibling dentries' offsets */
1402                         ceph_dir_clear_ordered(dir);
1403                         ceph_dir_clear_ordered(olddir);
1404
1405                         d_move(req->r_old_dentry, dn);
1406                         dout(" src %p '%pd' dst %p '%pd'\n",
1407                              req->r_old_dentry,
1408                              req->r_old_dentry,
1409                              dn, dn);
1410
1411                         /* ensure target dentry is invalidated, despite
1412                            rehashing bug in vfs_rename_dir */
1413                         ceph_invalidate_dentry_lease(dn);
1414
1415                         dout("dn %p gets new offset %lld\n", req->r_old_dentry,
1416                              ceph_dentry(req->r_old_dentry)->offset);
1417
1418                         /* swap r_dentry and r_old_dentry in case that
1419                          * splice_dentry() gets called later. This is safe
1420                          * because no other place will use them */
1421                         req->r_dentry = req->r_old_dentry;
1422                         req->r_old_dentry = dn;
1423                         dn = req->r_dentry;
1424                 }
1425
1426                 /* null dentry? */
1427                 if (!rinfo->head->is_target) {
1428                         dout("fill_trace null dentry\n");
1429                         if (d_really_is_positive(dn)) {
1430                                 dout("d_delete %p\n", dn);
1431                                 ceph_dir_clear_ordered(dir);
1432                                 d_delete(dn);
1433                         } else if (have_lease) {
1434                                 if (d_unhashed(dn))
1435                                         d_add(dn, NULL);
1436                                 update_dentry_lease(dir, dn,
1437                                                     rinfo->dlease, session,
1438                                                     req->r_request_started);
1439                         }
1440                         goto done;
1441                 }
1442
1443                 /* attach proper inode */
1444                 if (d_really_is_negative(dn)) {
1445                         ceph_dir_clear_ordered(dir);
1446                         ihold(in);
1447                         err = splice_dentry(&req->r_dentry, in);
1448                         if (err < 0)
1449                                 goto done;
1450                         dn = req->r_dentry;  /* may have spliced */
1451                 } else if (d_really_is_positive(dn) && d_inode(dn) != in) {
1452                         dout(" %p links to %p %llx.%llx, not %llx.%llx\n",
1453                              dn, d_inode(dn), ceph_vinop(d_inode(dn)),
1454                              ceph_vinop(in));
1455                         d_invalidate(dn);
1456                         have_lease = false;
1457                 }
1458
1459                 if (have_lease) {
1460                         update_dentry_lease(dir, dn,
1461                                             rinfo->dlease, session,
1462                                             req->r_request_started);
1463                 }
1464                 dout(" final dn %p\n", dn);
1465         } else if ((req->r_op == CEPH_MDS_OP_LOOKUPSNAP ||
1466                     req->r_op == CEPH_MDS_OP_MKSNAP) &&
1467                    test_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags) &&
1468                    !test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
1469                 struct inode *dir = req->r_parent;
1470
1471                 /* fill out a snapdir LOOKUPSNAP dentry */
1472                 BUG_ON(!dir);
1473                 BUG_ON(ceph_snap(dir) != CEPH_SNAPDIR);
1474                 BUG_ON(!req->r_dentry);
1475                 dout(" linking snapped dir %p to dn %p\n", in, req->r_dentry);
1476                 ceph_dir_clear_ordered(dir);
1477                 ihold(in);
1478                 err = splice_dentry(&req->r_dentry, in);
1479                 if (err < 0)
1480                         goto done;
1481         } else if (rinfo->head->is_dentry && req->r_dentry) {
1482                 /* parent inode is not locked, be carefull */
1483                 struct ceph_vino *ptvino = NULL;
1484                 dvino.ino = le64_to_cpu(rinfo->diri.in->ino);
1485                 dvino.snap = le64_to_cpu(rinfo->diri.in->snapid);
1486                 if (rinfo->head->is_target) {
1487                         tvino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1488                         tvino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1489                         ptvino = &tvino;
1490                 }
1491                 update_dentry_lease_careful(req->r_dentry, rinfo->dlease,
1492                                             session, req->r_request_started,
1493                                             rinfo->dname, rinfo->dname_len,
1494                                             &dvino, ptvino);
1495         }
1496 done:
1497         dout("fill_trace done err=%d\n", err);
1498         return err;
1499 }
1500
1501 /*
1502  * Prepopulate our cache with readdir results, leases, etc.
1503  */
1504 static int readdir_prepopulate_inodes_only(struct ceph_mds_request *req,
1505                                            struct ceph_mds_session *session)
1506 {
1507         struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1508         int i, err = 0;
1509
1510         for (i = 0; i < rinfo->dir_nr; i++) {
1511                 struct ceph_mds_reply_dir_entry *rde = rinfo->dir_entries + i;
1512                 struct ceph_vino vino;
1513                 struct inode *in;
1514                 int rc;
1515
1516                 vino.ino = le64_to_cpu(rde->inode.in->ino);
1517                 vino.snap = le64_to_cpu(rde->inode.in->snapid);
1518
1519                 in = ceph_get_inode(req->r_dentry->d_sb, vino);
1520                 if (IS_ERR(in)) {
1521                         err = PTR_ERR(in);
1522                         dout("new_inode badness got %d\n", err);
1523                         continue;
1524                 }
1525                 rc = ceph_fill_inode(in, NULL, &rde->inode, NULL, session,
1526                                      -1, &req->r_caps_reservation);
1527                 if (rc < 0) {
1528                         pr_err("ceph_fill_inode badness on %p got %d\n",
1529                                in, rc);
1530                         err = rc;
1531                         if (in->i_state & I_NEW) {
1532                                 ihold(in);
1533                                 discard_new_inode(in);
1534                         }
1535                 } else if (in->i_state & I_NEW) {
1536                         unlock_new_inode(in);
1537                 }
1538
1539                 /* avoid calling iput_final() in mds dispatch threads */
1540                 ceph_async_iput(in);
1541         }
1542
1543         return err;
1544 }
1545
1546 void ceph_readdir_cache_release(struct ceph_readdir_cache_control *ctl)
1547 {
1548         if (ctl->page) {
1549                 kunmap(ctl->page);
1550                 put_page(ctl->page);
1551                 ctl->page = NULL;
1552         }
1553 }
1554
1555 static int fill_readdir_cache(struct inode *dir, struct dentry *dn,
1556                               struct ceph_readdir_cache_control *ctl,
1557                               struct ceph_mds_request *req)
1558 {
1559         struct ceph_inode_info *ci = ceph_inode(dir);
1560         unsigned nsize = PAGE_SIZE / sizeof(struct dentry*);
1561         unsigned idx = ctl->index % nsize;
1562         pgoff_t pgoff = ctl->index / nsize;
1563
1564         if (!ctl->page || pgoff != page_index(ctl->page)) {
1565                 ceph_readdir_cache_release(ctl);
1566                 if (idx == 0)
1567                         ctl->page = grab_cache_page(&dir->i_data, pgoff);
1568                 else
1569                         ctl->page = find_lock_page(&dir->i_data, pgoff);
1570                 if (!ctl->page) {
1571                         ctl->index = -1;
1572                         return idx == 0 ? -ENOMEM : 0;
1573                 }
1574                 /* reading/filling the cache are serialized by
1575                  * i_mutex, no need to use page lock */
1576                 unlock_page(ctl->page);
1577                 ctl->dentries = kmap(ctl->page);
1578                 if (idx == 0)
1579                         memset(ctl->dentries, 0, PAGE_SIZE);
1580         }
1581
1582         if (req->r_dir_release_cnt == atomic64_read(&ci->i_release_count) &&
1583             req->r_dir_ordered_cnt == atomic64_read(&ci->i_ordered_count)) {
1584                 dout("readdir cache dn %p idx %d\n", dn, ctl->index);
1585                 ctl->dentries[idx] = dn;
1586                 ctl->index++;
1587         } else {
1588                 dout("disable readdir cache\n");
1589                 ctl->index = -1;
1590         }
1591         return 0;
1592 }
1593
1594 int ceph_readdir_prepopulate(struct ceph_mds_request *req,
1595                              struct ceph_mds_session *session)
1596 {
1597         struct dentry *parent = req->r_dentry;
1598         struct ceph_inode_info *ci = ceph_inode(d_inode(parent));
1599         struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1600         struct qstr dname;
1601         struct dentry *dn;
1602         struct inode *in;
1603         int err = 0, skipped = 0, ret, i;
1604         struct ceph_mds_request_head *rhead = req->r_request->front.iov_base;
1605         u32 frag = le32_to_cpu(rhead->args.readdir.frag);
1606         u32 last_hash = 0;
1607         u32 fpos_offset;
1608         struct ceph_readdir_cache_control cache_ctl = {};
1609
1610         if (test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags))
1611                 return readdir_prepopulate_inodes_only(req, session);
1612
1613         if (rinfo->hash_order) {
1614                 if (req->r_path2) {
1615                         last_hash = ceph_str_hash(ci->i_dir_layout.dl_dir_hash,
1616                                                   req->r_path2,
1617                                                   strlen(req->r_path2));
1618                         last_hash = ceph_frag_value(last_hash);
1619                 } else if (rinfo->offset_hash) {
1620                         /* mds understands offset_hash */
1621                         WARN_ON_ONCE(req->r_readdir_offset != 2);
1622                         last_hash = le32_to_cpu(rhead->args.readdir.offset_hash);
1623                 }
1624         }
1625
1626         if (rinfo->dir_dir &&
1627             le32_to_cpu(rinfo->dir_dir->frag) != frag) {
1628                 dout("readdir_prepopulate got new frag %x -> %x\n",
1629                      frag, le32_to_cpu(rinfo->dir_dir->frag));
1630                 frag = le32_to_cpu(rinfo->dir_dir->frag);
1631                 if (!rinfo->hash_order)
1632                         req->r_readdir_offset = 2;
1633         }
1634
1635         if (le32_to_cpu(rinfo->head->op) == CEPH_MDS_OP_LSSNAP) {
1636                 dout("readdir_prepopulate %d items under SNAPDIR dn %p\n",
1637                      rinfo->dir_nr, parent);
1638         } else {
1639                 dout("readdir_prepopulate %d items under dn %p\n",
1640                      rinfo->dir_nr, parent);
1641                 if (rinfo->dir_dir)
1642                         ceph_fill_dirfrag(d_inode(parent), rinfo->dir_dir);
1643
1644                 if (ceph_frag_is_leftmost(frag) &&
1645                     req->r_readdir_offset == 2 &&
1646                     !(rinfo->hash_order && last_hash)) {
1647                         /* note dir version at start of readdir so we can
1648                          * tell if any dentries get dropped */
1649                         req->r_dir_release_cnt =
1650                                 atomic64_read(&ci->i_release_count);
1651                         req->r_dir_ordered_cnt =
1652                                 atomic64_read(&ci->i_ordered_count);
1653                         req->r_readdir_cache_idx = 0;
1654                 }
1655         }
1656
1657         cache_ctl.index = req->r_readdir_cache_idx;
1658         fpos_offset = req->r_readdir_offset;
1659
1660         /* FIXME: release caps/leases if error occurs */
1661         for (i = 0; i < rinfo->dir_nr; i++) {
1662                 struct ceph_mds_reply_dir_entry *rde = rinfo->dir_entries + i;
1663                 struct ceph_vino tvino;
1664
1665                 dname.name = rde->name;
1666                 dname.len = rde->name_len;
1667                 dname.hash = full_name_hash(parent, dname.name, dname.len);
1668
1669                 tvino.ino = le64_to_cpu(rde->inode.in->ino);
1670                 tvino.snap = le64_to_cpu(rde->inode.in->snapid);
1671
1672                 if (rinfo->hash_order) {
1673                         u32 hash = ceph_str_hash(ci->i_dir_layout.dl_dir_hash,
1674                                                  rde->name, rde->name_len);
1675                         hash = ceph_frag_value(hash);
1676                         if (hash != last_hash)
1677                                 fpos_offset = 2;
1678                         last_hash = hash;
1679                         rde->offset = ceph_make_fpos(hash, fpos_offset++, true);
1680                 } else {
1681                         rde->offset = ceph_make_fpos(frag, fpos_offset++, false);
1682                 }
1683
1684 retry_lookup:
1685                 dn = d_lookup(parent, &dname);
1686                 dout("d_lookup on parent=%p name=%.*s got %p\n",
1687                      parent, dname.len, dname.name, dn);
1688
1689                 if (!dn) {
1690                         dn = d_alloc(parent, &dname);
1691                         dout("d_alloc %p '%.*s' = %p\n", parent,
1692                              dname.len, dname.name, dn);
1693                         if (!dn) {
1694                                 dout("d_alloc badness\n");
1695                                 err = -ENOMEM;
1696                                 goto out;
1697                         }
1698                 } else if (d_really_is_positive(dn) &&
1699                            (ceph_ino(d_inode(dn)) != tvino.ino ||
1700                             ceph_snap(d_inode(dn)) != tvino.snap)) {
1701                         struct ceph_dentry_info *di = ceph_dentry(dn);
1702                         dout(" dn %p points to wrong inode %p\n",
1703                              dn, d_inode(dn));
1704
1705                         spin_lock(&dn->d_lock);
1706                         if (di->offset > 0 &&
1707                             di->lease_shared_gen ==
1708                             atomic_read(&ci->i_shared_gen)) {
1709                                 __ceph_dir_clear_ordered(ci);
1710                                 di->offset = 0;
1711                         }
1712                         spin_unlock(&dn->d_lock);
1713
1714                         d_delete(dn);
1715                         dput(dn);
1716                         goto retry_lookup;
1717                 }
1718
1719                 /* inode */
1720                 if (d_really_is_positive(dn)) {
1721                         in = d_inode(dn);
1722                 } else {
1723                         in = ceph_get_inode(parent->d_sb, tvino);
1724                         if (IS_ERR(in)) {
1725                                 dout("new_inode badness\n");
1726                                 d_drop(dn);
1727                                 dput(dn);
1728                                 err = PTR_ERR(in);
1729                                 goto out;
1730                         }
1731                 }
1732
1733                 ret = ceph_fill_inode(in, NULL, &rde->inode, NULL, session,
1734                                       -1, &req->r_caps_reservation);
1735                 if (ret < 0) {
1736                         pr_err("ceph_fill_inode badness on %p\n", in);
1737                         if (d_really_is_negative(dn)) {
1738                                 /* avoid calling iput_final() in mds
1739                                  * dispatch threads */
1740                                 if (in->i_state & I_NEW) {
1741                                         ihold(in);
1742                                         discard_new_inode(in);
1743                                 }
1744                                 ceph_async_iput(in);
1745                         }
1746                         d_drop(dn);
1747                         err = ret;
1748                         goto next_item;
1749                 }
1750                 if (in->i_state & I_NEW)
1751                         unlock_new_inode(in);
1752
1753                 if (d_really_is_negative(dn)) {
1754                         if (ceph_security_xattr_deadlock(in)) {
1755                                 dout(" skip splicing dn %p to inode %p"
1756                                      " (security xattr deadlock)\n", dn, in);
1757                                 ceph_async_iput(in);
1758                                 skipped++;
1759                                 goto next_item;
1760                         }
1761
1762                         err = splice_dentry(&dn, in);
1763                         if (err < 0)
1764                                 goto next_item;
1765                 }
1766
1767                 ceph_dentry(dn)->offset = rde->offset;
1768
1769                 update_dentry_lease(d_inode(parent), dn,
1770                                     rde->lease, req->r_session,
1771                                     req->r_request_started);
1772
1773                 if (err == 0 && skipped == 0 && cache_ctl.index >= 0) {
1774                         ret = fill_readdir_cache(d_inode(parent), dn,
1775                                                  &cache_ctl, req);
1776                         if (ret < 0)
1777                                 err = ret;
1778                 }
1779 next_item:
1780                 dput(dn);
1781         }
1782 out:
1783         if (err == 0 && skipped == 0) {
1784                 set_bit(CEPH_MDS_R_DID_PREPOPULATE, &req->r_req_flags);
1785                 req->r_readdir_cache_idx = cache_ctl.index;
1786         }
1787         ceph_readdir_cache_release(&cache_ctl);
1788         dout("readdir_prepopulate done\n");
1789         return err;
1790 }
1791
1792 bool ceph_inode_set_size(struct inode *inode, loff_t size)
1793 {
1794         struct ceph_inode_info *ci = ceph_inode(inode);
1795         bool ret;
1796
1797         spin_lock(&ci->i_ceph_lock);
1798         dout("set_size %p %llu -> %llu\n", inode, inode->i_size, size);
1799         i_size_write(inode, size);
1800         inode->i_blocks = calc_inode_blocks(size);
1801
1802         ret = __ceph_should_report_size(ci);
1803
1804         spin_unlock(&ci->i_ceph_lock);
1805         return ret;
1806 }
1807
1808 /*
1809  * Put reference to inode, but avoid calling iput_final() in current thread.
1810  * iput_final() may wait for reahahead pages. The wait can cause deadlock in
1811  * some contexts.
1812  */
1813 void ceph_async_iput(struct inode *inode)
1814 {
1815         if (!inode)
1816                 return;
1817         for (;;) {
1818                 if (atomic_add_unless(&inode->i_count, -1, 1))
1819                         break;
1820                 if (queue_work(ceph_inode_to_client(inode)->inode_wq,
1821                                &ceph_inode(inode)->i_work))
1822                         break;
1823                 /* queue work failed, i_count must be at least 2 */
1824         }
1825 }
1826
1827 /*
1828  * Write back inode data in a worker thread.  (This can't be done
1829  * in the message handler context.)
1830  */
1831 void ceph_queue_writeback(struct inode *inode)
1832 {
1833         struct ceph_inode_info *ci = ceph_inode(inode);
1834         set_bit(CEPH_I_WORK_WRITEBACK, &ci->i_work_mask);
1835
1836         ihold(inode);
1837         if (queue_work(ceph_inode_to_client(inode)->inode_wq,
1838                        &ci->i_work)) {
1839                 dout("ceph_queue_writeback %p\n", inode);
1840         } else {
1841                 dout("ceph_queue_writeback %p already queued, mask=%lx\n",
1842                      inode, ci->i_work_mask);
1843                 iput(inode);
1844         }
1845 }
1846
1847 /*
1848  * queue an async invalidation
1849  */
1850 void ceph_queue_invalidate(struct inode *inode)
1851 {
1852         struct ceph_inode_info *ci = ceph_inode(inode);
1853         set_bit(CEPH_I_WORK_INVALIDATE_PAGES, &ci->i_work_mask);
1854
1855         ihold(inode);
1856         if (queue_work(ceph_inode_to_client(inode)->inode_wq,
1857                        &ceph_inode(inode)->i_work)) {
1858                 dout("ceph_queue_invalidate %p\n", inode);
1859         } else {
1860                 dout("ceph_queue_invalidate %p already queued, mask=%lx\n",
1861                      inode, ci->i_work_mask);
1862                 iput(inode);
1863         }
1864 }
1865
1866 /*
1867  * Queue an async vmtruncate.  If we fail to queue work, we will handle
1868  * the truncation the next time we call __ceph_do_pending_vmtruncate.
1869  */
1870 void ceph_queue_vmtruncate(struct inode *inode)
1871 {
1872         struct ceph_inode_info *ci = ceph_inode(inode);
1873         set_bit(CEPH_I_WORK_VMTRUNCATE, &ci->i_work_mask);
1874
1875         ihold(inode);
1876         if (queue_work(ceph_inode_to_client(inode)->inode_wq,
1877                        &ci->i_work)) {
1878                 dout("ceph_queue_vmtruncate %p\n", inode);
1879         } else {
1880                 dout("ceph_queue_vmtruncate %p already queued, mask=%lx\n",
1881                      inode, ci->i_work_mask);
1882                 iput(inode);
1883         }
1884 }
1885
1886 static void ceph_do_invalidate_pages(struct inode *inode)
1887 {
1888         struct ceph_inode_info *ci = ceph_inode(inode);
1889         struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1890         u32 orig_gen;
1891         int check = 0;
1892
1893         mutex_lock(&ci->i_truncate_mutex);
1894
1895         if (READ_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) {
1896                 pr_warn_ratelimited("invalidate_pages %p %lld forced umount\n",
1897                                     inode, ceph_ino(inode));
1898                 mapping_set_error(inode->i_mapping, -EIO);
1899                 truncate_pagecache(inode, 0);
1900                 mutex_unlock(&ci->i_truncate_mutex);
1901                 goto out;
1902         }
1903
1904         spin_lock(&ci->i_ceph_lock);
1905         dout("invalidate_pages %p gen %d revoking %d\n", inode,
1906              ci->i_rdcache_gen, ci->i_rdcache_revoking);
1907         if (ci->i_rdcache_revoking != ci->i_rdcache_gen) {
1908                 if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE))
1909                         check = 1;
1910                 spin_unlock(&ci->i_ceph_lock);
1911                 mutex_unlock(&ci->i_truncate_mutex);
1912                 goto out;
1913         }
1914         orig_gen = ci->i_rdcache_gen;
1915         spin_unlock(&ci->i_ceph_lock);
1916
1917         ceph_fscache_invalidate(inode);
1918         if (invalidate_inode_pages2(inode->i_mapping) < 0) {
1919                 pr_err("invalidate_pages %p fails\n", inode);
1920         }
1921
1922         spin_lock(&ci->i_ceph_lock);
1923         if (orig_gen == ci->i_rdcache_gen &&
1924             orig_gen == ci->i_rdcache_revoking) {
1925                 dout("invalidate_pages %p gen %d successful\n", inode,
1926                      ci->i_rdcache_gen);
1927                 ci->i_rdcache_revoking--;
1928                 check = 1;
1929         } else {
1930                 dout("invalidate_pages %p gen %d raced, now %d revoking %d\n",
1931                      inode, orig_gen, ci->i_rdcache_gen,
1932                      ci->i_rdcache_revoking);
1933                 if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE))
1934                         check = 1;
1935         }
1936         spin_unlock(&ci->i_ceph_lock);
1937         mutex_unlock(&ci->i_truncate_mutex);
1938 out:
1939         if (check)
1940                 ceph_check_caps(ci, 0, NULL);
1941 }
1942
1943 /*
1944  * Make sure any pending truncation is applied before doing anything
1945  * that may depend on it.
1946  */
1947 void __ceph_do_pending_vmtruncate(struct inode *inode)
1948 {
1949         struct ceph_inode_info *ci = ceph_inode(inode);
1950         u64 to;
1951         int wrbuffer_refs, finish = 0;
1952
1953         mutex_lock(&ci->i_truncate_mutex);
1954 retry:
1955         spin_lock(&ci->i_ceph_lock);
1956         if (ci->i_truncate_pending == 0) {
1957                 dout("__do_pending_vmtruncate %p none pending\n", inode);
1958                 spin_unlock(&ci->i_ceph_lock);
1959                 mutex_unlock(&ci->i_truncate_mutex);
1960                 return;
1961         }
1962
1963         /*
1964          * make sure any dirty snapped pages are flushed before we
1965          * possibly truncate them.. so write AND block!
1966          */
1967         if (ci->i_wrbuffer_ref_head < ci->i_wrbuffer_ref) {
1968                 spin_unlock(&ci->i_ceph_lock);
1969                 dout("__do_pending_vmtruncate %p flushing snaps first\n",
1970                      inode);
1971                 filemap_write_and_wait_range(&inode->i_data, 0,
1972                                              inode->i_sb->s_maxbytes);
1973                 goto retry;
1974         }
1975
1976         /* there should be no reader or writer */
1977         WARN_ON_ONCE(ci->i_rd_ref || ci->i_wr_ref);
1978
1979         to = ci->i_truncate_size;
1980         wrbuffer_refs = ci->i_wrbuffer_ref;
1981         dout("__do_pending_vmtruncate %p (%d) to %lld\n", inode,
1982              ci->i_truncate_pending, to);
1983         spin_unlock(&ci->i_ceph_lock);
1984
1985         truncate_pagecache(inode, to);
1986
1987         spin_lock(&ci->i_ceph_lock);
1988         if (to == ci->i_truncate_size) {
1989                 ci->i_truncate_pending = 0;
1990                 finish = 1;
1991         }
1992         spin_unlock(&ci->i_ceph_lock);
1993         if (!finish)
1994                 goto retry;
1995
1996         mutex_unlock(&ci->i_truncate_mutex);
1997
1998         if (wrbuffer_refs == 0)
1999                 ceph_check_caps(ci, 0, NULL);
2000
2001         wake_up_all(&ci->i_cap_wq);
2002 }
2003
2004 static void ceph_inode_work(struct work_struct *work)
2005 {
2006         struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
2007                                                  i_work);
2008         struct inode *inode = &ci->vfs_inode;
2009
2010         if (test_and_clear_bit(CEPH_I_WORK_WRITEBACK, &ci->i_work_mask)) {
2011                 dout("writeback %p\n", inode);
2012                 filemap_fdatawrite(&inode->i_data);
2013         }
2014         if (test_and_clear_bit(CEPH_I_WORK_INVALIDATE_PAGES, &ci->i_work_mask))
2015                 ceph_do_invalidate_pages(inode);
2016
2017         if (test_and_clear_bit(CEPH_I_WORK_VMTRUNCATE, &ci->i_work_mask))
2018                 __ceph_do_pending_vmtruncate(inode);
2019
2020         iput(inode);
2021 }
2022
2023 /*
2024  * symlinks
2025  */
2026 static const struct inode_operations ceph_symlink_iops = {
2027         .get_link = simple_get_link,
2028         .setattr = ceph_setattr,
2029         .getattr = ceph_getattr,
2030         .listxattr = ceph_listxattr,
2031 };
2032
2033 int __ceph_setattr(struct inode *inode, struct iattr *attr)
2034 {
2035         struct ceph_inode_info *ci = ceph_inode(inode);
2036         unsigned int ia_valid = attr->ia_valid;
2037         struct ceph_mds_request *req;
2038         struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
2039         struct ceph_cap_flush *prealloc_cf;
2040         int issued;
2041         int release = 0, dirtied = 0;
2042         int mask = 0;
2043         int err = 0;
2044         int inode_dirty_flags = 0;
2045         bool lock_snap_rwsem = false;
2046
2047         prealloc_cf = ceph_alloc_cap_flush();
2048         if (!prealloc_cf)
2049                 return -ENOMEM;
2050
2051         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETATTR,
2052                                        USE_AUTH_MDS);
2053         if (IS_ERR(req)) {
2054                 ceph_free_cap_flush(prealloc_cf);
2055                 return PTR_ERR(req);
2056         }
2057
2058         spin_lock(&ci->i_ceph_lock);
2059         issued = __ceph_caps_issued(ci, NULL);
2060
2061         if (!ci->i_head_snapc &&
2062             (issued & (CEPH_CAP_ANY_EXCL | CEPH_CAP_FILE_WR))) {
2063                 lock_snap_rwsem = true;
2064                 if (!down_read_trylock(&mdsc->snap_rwsem)) {
2065                         spin_unlock(&ci->i_ceph_lock);
2066                         down_read(&mdsc->snap_rwsem);
2067                         spin_lock(&ci->i_ceph_lock);
2068                         issued = __ceph_caps_issued(ci, NULL);
2069                 }
2070         }
2071
2072         dout("setattr %p issued %s\n", inode, ceph_cap_string(issued));
2073
2074         if (ia_valid & ATTR_UID) {
2075                 dout("setattr %p uid %d -> %d\n", inode,
2076                      from_kuid(&init_user_ns, inode->i_uid),
2077                      from_kuid(&init_user_ns, attr->ia_uid));
2078                 if (issued & CEPH_CAP_AUTH_EXCL) {
2079                         inode->i_uid = attr->ia_uid;
2080                         dirtied |= CEPH_CAP_AUTH_EXCL;
2081                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
2082                            !uid_eq(attr->ia_uid, inode->i_uid)) {
2083                         req->r_args.setattr.uid = cpu_to_le32(
2084                                 from_kuid(&init_user_ns, attr->ia_uid));
2085                         mask |= CEPH_SETATTR_UID;
2086                         release |= CEPH_CAP_AUTH_SHARED;
2087                 }
2088         }
2089         if (ia_valid & ATTR_GID) {
2090                 dout("setattr %p gid %d -> %d\n", inode,
2091                      from_kgid(&init_user_ns, inode->i_gid),
2092                      from_kgid(&init_user_ns, attr->ia_gid));
2093                 if (issued & CEPH_CAP_AUTH_EXCL) {
2094                         inode->i_gid = attr->ia_gid;
2095                         dirtied |= CEPH_CAP_AUTH_EXCL;
2096                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
2097                            !gid_eq(attr->ia_gid, inode->i_gid)) {
2098                         req->r_args.setattr.gid = cpu_to_le32(
2099                                 from_kgid(&init_user_ns, attr->ia_gid));
2100                         mask |= CEPH_SETATTR_GID;
2101                         release |= CEPH_CAP_AUTH_SHARED;
2102                 }
2103         }
2104         if (ia_valid & ATTR_MODE) {
2105                 dout("setattr %p mode 0%o -> 0%o\n", inode, inode->i_mode,
2106                      attr->ia_mode);
2107                 if (issued & CEPH_CAP_AUTH_EXCL) {
2108                         inode->i_mode = attr->ia_mode;
2109                         dirtied |= CEPH_CAP_AUTH_EXCL;
2110                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
2111                            attr->ia_mode != inode->i_mode) {
2112                         inode->i_mode = attr->ia_mode;
2113                         req->r_args.setattr.mode = cpu_to_le32(attr->ia_mode);
2114                         mask |= CEPH_SETATTR_MODE;
2115                         release |= CEPH_CAP_AUTH_SHARED;
2116                 }
2117         }
2118
2119         if (ia_valid & ATTR_ATIME) {
2120                 dout("setattr %p atime %lld.%ld -> %lld.%ld\n", inode,
2121                      inode->i_atime.tv_sec, inode->i_atime.tv_nsec,
2122                      attr->ia_atime.tv_sec, attr->ia_atime.tv_nsec);
2123                 if (issued & CEPH_CAP_FILE_EXCL) {
2124                         ci->i_time_warp_seq++;
2125                         inode->i_atime = attr->ia_atime;
2126                         dirtied |= CEPH_CAP_FILE_EXCL;
2127                 } else if ((issued & CEPH_CAP_FILE_WR) &&
2128                            timespec64_compare(&inode->i_atime,
2129                                             &attr->ia_atime) < 0) {
2130                         inode->i_atime = attr->ia_atime;
2131                         dirtied |= CEPH_CAP_FILE_WR;
2132                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
2133                            !timespec64_equal(&inode->i_atime, &attr->ia_atime)) {
2134                         ceph_encode_timespec64(&req->r_args.setattr.atime,
2135                                                &attr->ia_atime);
2136                         mask |= CEPH_SETATTR_ATIME;
2137                         release |= CEPH_CAP_FILE_SHARED |
2138                                    CEPH_CAP_FILE_RD | CEPH_CAP_FILE_WR;
2139                 }
2140         }
2141         if (ia_valid & ATTR_SIZE) {
2142                 dout("setattr %p size %lld -> %lld\n", inode,
2143                      inode->i_size, attr->ia_size);
2144                 if ((issued & CEPH_CAP_FILE_EXCL) &&
2145                     attr->ia_size > inode->i_size) {
2146                         i_size_write(inode, attr->ia_size);
2147                         inode->i_blocks = calc_inode_blocks(attr->ia_size);
2148                         ci->i_reported_size = attr->ia_size;
2149                         dirtied |= CEPH_CAP_FILE_EXCL;
2150                         ia_valid |= ATTR_MTIME;
2151                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
2152                            attr->ia_size != inode->i_size) {
2153                         req->r_args.setattr.size = cpu_to_le64(attr->ia_size);
2154                         req->r_args.setattr.old_size =
2155                                 cpu_to_le64(inode->i_size);
2156                         mask |= CEPH_SETATTR_SIZE;
2157                         release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_EXCL |
2158                                    CEPH_CAP_FILE_RD | CEPH_CAP_FILE_WR;
2159                 }
2160         }
2161         if (ia_valid & ATTR_MTIME) {
2162                 dout("setattr %p mtime %lld.%ld -> %lld.%ld\n", inode,
2163                      inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
2164                      attr->ia_mtime.tv_sec, attr->ia_mtime.tv_nsec);
2165                 if (issued & CEPH_CAP_FILE_EXCL) {
2166                         ci->i_time_warp_seq++;
2167                         inode->i_mtime = attr->ia_mtime;
2168                         dirtied |= CEPH_CAP_FILE_EXCL;
2169                 } else if ((issued & CEPH_CAP_FILE_WR) &&
2170                            timespec64_compare(&inode->i_mtime,
2171                                             &attr->ia_mtime) < 0) {
2172                         inode->i_mtime = attr->ia_mtime;
2173                         dirtied |= CEPH_CAP_FILE_WR;
2174                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
2175                            !timespec64_equal(&inode->i_mtime, &attr->ia_mtime)) {
2176                         ceph_encode_timespec64(&req->r_args.setattr.mtime,
2177                                                &attr->ia_mtime);
2178                         mask |= CEPH_SETATTR_MTIME;
2179                         release |= CEPH_CAP_FILE_SHARED |
2180                                    CEPH_CAP_FILE_RD | CEPH_CAP_FILE_WR;
2181                 }
2182         }
2183
2184         /* these do nothing */
2185         if (ia_valid & ATTR_CTIME) {
2186                 bool only = (ia_valid & (ATTR_SIZE|ATTR_MTIME|ATTR_ATIME|
2187                                          ATTR_MODE|ATTR_UID|ATTR_GID)) == 0;
2188                 dout("setattr %p ctime %lld.%ld -> %lld.%ld (%s)\n", inode,
2189                      inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
2190                      attr->ia_ctime.tv_sec, attr->ia_ctime.tv_nsec,
2191                      only ? "ctime only" : "ignored");
2192                 if (only) {
2193                         /*
2194                          * if kernel wants to dirty ctime but nothing else,
2195                          * we need to choose a cap to dirty under, or do
2196                          * a almost-no-op setattr
2197                          */
2198                         if (issued & CEPH_CAP_AUTH_EXCL)
2199                                 dirtied |= CEPH_CAP_AUTH_EXCL;
2200                         else if (issued & CEPH_CAP_FILE_EXCL)
2201                                 dirtied |= CEPH_CAP_FILE_EXCL;
2202                         else if (issued & CEPH_CAP_XATTR_EXCL)
2203                                 dirtied |= CEPH_CAP_XATTR_EXCL;
2204                         else
2205                                 mask |= CEPH_SETATTR_CTIME;
2206                 }
2207         }
2208         if (ia_valid & ATTR_FILE)
2209                 dout("setattr %p ATTR_FILE ... hrm!\n", inode);
2210
2211         if (dirtied) {
2212                 inode_dirty_flags = __ceph_mark_dirty_caps(ci, dirtied,
2213                                                            &prealloc_cf);
2214                 inode->i_ctime = attr->ia_ctime;
2215         }
2216
2217         release &= issued;
2218         spin_unlock(&ci->i_ceph_lock);
2219         if (lock_snap_rwsem)
2220                 up_read(&mdsc->snap_rwsem);
2221
2222         if (inode_dirty_flags)
2223                 __mark_inode_dirty(inode, inode_dirty_flags);
2224
2225
2226         if (mask) {
2227                 req->r_inode = inode;
2228                 ihold(inode);
2229                 req->r_inode_drop = release;
2230                 req->r_args.setattr.mask = cpu_to_le32(mask);
2231                 req->r_num_caps = 1;
2232                 req->r_stamp = attr->ia_ctime;
2233                 err = ceph_mdsc_do_request(mdsc, NULL, req);
2234         }
2235         dout("setattr %p result=%d (%s locally, %d remote)\n", inode, err,
2236              ceph_cap_string(dirtied), mask);
2237
2238         ceph_mdsc_put_request(req);
2239         ceph_free_cap_flush(prealloc_cf);
2240
2241         if (err >= 0 && (mask & CEPH_SETATTR_SIZE))
2242                 __ceph_do_pending_vmtruncate(inode);
2243
2244         return err;
2245 }
2246
2247 /*
2248  * setattr
2249  */
2250 int ceph_setattr(struct dentry *dentry, struct iattr *attr)
2251 {
2252         struct inode *inode = d_inode(dentry);
2253         struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
2254         int err;
2255
2256         if (ceph_snap(inode) != CEPH_NOSNAP)
2257                 return -EROFS;
2258
2259         err = setattr_prepare(dentry, attr);
2260         if (err != 0)
2261                 return err;
2262
2263         if ((attr->ia_valid & ATTR_SIZE) &&
2264             attr->ia_size > max(inode->i_size, fsc->max_file_size))
2265                 return -EFBIG;
2266
2267         if ((attr->ia_valid & ATTR_SIZE) &&
2268             ceph_quota_is_max_bytes_exceeded(inode, attr->ia_size))
2269                 return -EDQUOT;
2270
2271         err = __ceph_setattr(inode, attr);
2272
2273         if (err >= 0 && (attr->ia_valid & ATTR_MODE))
2274                 err = posix_acl_chmod(inode, attr->ia_mode);
2275
2276         return err;
2277 }
2278
2279 /*
2280  * Verify that we have a lease on the given mask.  If not,
2281  * do a getattr against an mds.
2282  */
2283 int __ceph_do_getattr(struct inode *inode, struct page *locked_page,
2284                       int mask, bool force)
2285 {
2286         struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
2287         struct ceph_mds_client *mdsc = fsc->mdsc;
2288         struct ceph_mds_request *req;
2289         int mode;
2290         int err;
2291
2292         if (ceph_snap(inode) == CEPH_SNAPDIR) {
2293                 dout("do_getattr inode %p SNAPDIR\n", inode);
2294                 return 0;
2295         }
2296
2297         dout("do_getattr inode %p mask %s mode 0%o\n",
2298              inode, ceph_cap_string(mask), inode->i_mode);
2299         if (!force && ceph_caps_issued_mask_metric(ceph_inode(inode), mask, 1))
2300                         return 0;
2301
2302         mode = (mask & CEPH_STAT_RSTAT) ? USE_AUTH_MDS : USE_ANY_MDS;
2303         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, mode);
2304         if (IS_ERR(req))
2305                 return PTR_ERR(req);
2306         req->r_inode = inode;
2307         ihold(inode);
2308         req->r_num_caps = 1;
2309         req->r_args.getattr.mask = cpu_to_le32(mask);
2310         req->r_locked_page = locked_page;
2311         err = ceph_mdsc_do_request(mdsc, NULL, req);
2312         if (locked_page && err == 0) {
2313                 u64 inline_version = req->r_reply_info.targeti.inline_version;
2314                 if (inline_version == 0) {
2315                         /* the reply is supposed to contain inline data */
2316                         err = -EINVAL;
2317                 } else if (inline_version == CEPH_INLINE_NONE) {
2318                         err = -ENODATA;
2319                 } else {
2320                         err = req->r_reply_info.targeti.inline_len;
2321                 }
2322         }
2323         ceph_mdsc_put_request(req);
2324         dout("do_getattr result=%d\n", err);
2325         return err;
2326 }
2327
2328
2329 /*
2330  * Check inode permissions.  We verify we have a valid value for
2331  * the AUTH cap, then call the generic handler.
2332  */
2333 int ceph_permission(struct inode *inode, int mask)
2334 {
2335         int err;
2336
2337         if (mask & MAY_NOT_BLOCK)
2338                 return -ECHILD;
2339
2340         err = ceph_do_getattr(inode, CEPH_CAP_AUTH_SHARED, false);
2341
2342         if (!err)
2343                 err = generic_permission(inode, mask);
2344         return err;
2345 }
2346
2347 /* Craft a mask of needed caps given a set of requested statx attrs. */
2348 static int statx_to_caps(u32 want)
2349 {
2350         int mask = 0;
2351
2352         if (want & (STATX_MODE|STATX_UID|STATX_GID|STATX_CTIME|STATX_BTIME))
2353                 mask |= CEPH_CAP_AUTH_SHARED;
2354
2355         if (want & (STATX_NLINK|STATX_CTIME))
2356                 mask |= CEPH_CAP_LINK_SHARED;
2357
2358         if (want & (STATX_ATIME|STATX_MTIME|STATX_CTIME|STATX_SIZE|
2359                     STATX_BLOCKS))
2360                 mask |= CEPH_CAP_FILE_SHARED;
2361
2362         if (want & (STATX_CTIME))
2363                 mask |= CEPH_CAP_XATTR_SHARED;
2364
2365         return mask;
2366 }
2367
2368 /*
2369  * Get all the attributes. If we have sufficient caps for the requested attrs,
2370  * then we can avoid talking to the MDS at all.
2371  */
2372 int ceph_getattr(const struct path *path, struct kstat *stat,
2373                  u32 request_mask, unsigned int flags)
2374 {
2375         struct inode *inode = d_inode(path->dentry);
2376         struct ceph_inode_info *ci = ceph_inode(inode);
2377         u32 valid_mask = STATX_BASIC_STATS;
2378         int err = 0;
2379
2380         /* Skip the getattr altogether if we're asked not to sync */
2381         if (!(flags & AT_STATX_DONT_SYNC)) {
2382                 err = ceph_do_getattr(inode, statx_to_caps(request_mask),
2383                                       flags & AT_STATX_FORCE_SYNC);
2384                 if (err)
2385                         return err;
2386         }
2387
2388         generic_fillattr(inode, stat);
2389         stat->ino = ceph_present_inode(inode);
2390
2391         /*
2392          * btime on newly-allocated inodes is 0, so if this is still set to
2393          * that, then assume that it's not valid.
2394          */
2395         if (ci->i_btime.tv_sec || ci->i_btime.tv_nsec) {
2396                 stat->btime = ci->i_btime;
2397                 valid_mask |= STATX_BTIME;
2398         }
2399
2400         if (ceph_snap(inode) == CEPH_NOSNAP)
2401                 stat->dev = inode->i_sb->s_dev;
2402         else
2403                 stat->dev = ci->i_snapid_map ? ci->i_snapid_map->dev : 0;
2404
2405         if (S_ISDIR(inode->i_mode)) {
2406                 if (ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb),
2407                                         RBYTES))
2408                         stat->size = ci->i_rbytes;
2409                 else
2410                         stat->size = ci->i_files + ci->i_subdirs;
2411                 stat->blocks = 0;
2412                 stat->blksize = 65536;
2413                 /*
2414                  * Some applications rely on the number of st_nlink
2415                  * value on directories to be either 0 (if unlinked)
2416                  * or 2 + number of subdirectories.
2417                  */
2418                 if (stat->nlink == 1)
2419                         /* '.' + '..' + subdirs */
2420                         stat->nlink = 1 + 1 + ci->i_subdirs;
2421         }
2422
2423         stat->result_mask = request_mask & valid_mask;
2424         return err;
2425 }