fs/ceph/inode.c

   1 #include <linux/ceph/ceph_debug.h>
   2
   3 #include <linux/module.h>
   4 #include <linux/fs.h>
   5 #include <linux/slab.h>
   6 #include <linux/string.h>
   7 #include <linux/uaccess.h>
   8 #include <linux/kernel.h>
   9 #include <linux/writeback.h>
  10 #include <linux/vmalloc.h>
  11 #include <linux/xattr.h>
  12 #include <linux/posix_acl.h>
  13 #include <linux/random.h>
  14 #include <linux/sort.h>
  15
  16 #include "super.h"
  17 #include "mds_client.h"
  18 #include "cache.h"
  19 #include <linux/ceph/decode.h>
  20
  21 /*
  22  * Ceph inode operations
  23  *
  24  * Implement basic inode helpers (get, alloc) and inode ops (getattr,
  25  * setattr, etc.), xattr helpers, and helpers for assimilating
  26  * metadata returned by the MDS into our cache.
  27  *
  28  * Also define helpers for doing asynchronous writeback, invalidation,
  29  * and truncation for the benefit of those who can't afford to block
  30  * (typically because they are in the message handler path).
  31  */
  32
  33 static const struct inode_operations ceph_symlink_iops;
  34
  35 static void ceph_invalidate_work(struct work_struct *work);
  36 static void ceph_writeback_work(struct work_struct *work);
  37 static void ceph_vmtruncate_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         ceph_inode(inode)->i_vino = *(struct ceph_vino *)data;
  45         inode->i_ino = ceph_vino_to_ino(*(struct ceph_vino *)data);
  46         return 0;
  47 }
  48
  49 struct inode *ceph_get_inode(struct super_block *sb, struct ceph_vino vino)
  50 {
  51         struct inode *inode;
  52         ino_t t = ceph_vino_to_ino(vino);
  53
  54         inode = iget5_locked(sb, t, ceph_ino_compare, ceph_set_ino_cb, &vino);
  55         if (!inode)
  56                 return ERR_PTR(-ENOMEM);
  57         if (inode->i_state & I_NEW) {
  58                 dout("get_inode created new inode %p %llx.%llx ino %llx\n",
  59                      inode, ceph_vinop(inode), (u64)inode->i_ino);
  60                 unlock_new_inode(inode);
  61         }
  62
  63         dout("get_inode on %lu=%llx.%llx got %p\n", inode->i_ino, vino.ino,
  64              vino.snap, inode);
  65         return inode;
  66 }
  67
  68 /*
  69  * get/constuct snapdir inode for a given directory
  70  */
  71 struct inode *ceph_get_snapdir(struct inode *parent)
  72 {
  73         struct ceph_vino vino = {
  74                 .ino = ceph_ino(parent),
  75                 .snap = CEPH_SNAPDIR,
  76         };
  77         struct inode *inode = ceph_get_inode(parent->i_sb, vino);
  78         struct ceph_inode_info *ci = ceph_inode(inode);
  79
  80         BUG_ON(!S_ISDIR(parent->i_mode));
  81         if (IS_ERR(inode))
  82                 return inode;
  83         inode->i_mode = parent->i_mode;
  84         inode->i_uid = parent->i_uid;
  85         inode->i_gid = parent->i_gid;
  86         inode->i_op = &ceph_snapdir_iops;
  87         inode->i_fop = &ceph_snapdir_fops;
  88         ci->i_snap_caps = CEPH_CAP_PIN; /* so we can open */
  89         ci->i_rbytes = 0;
  90         return inode;
  91 }
  92
  93 const struct inode_operations ceph_file_iops = {
  94         .permission = ceph_permission,
  95         .setattr = ceph_setattr,
  96         .getattr = ceph_getattr,
  97         .listxattr = ceph_listxattr,
  98         .get_acl = ceph_get_acl,
  99         .set_acl = ceph_set_acl,
 100 };
 101
 102
 103 /*
 104  * We use a 'frag tree' to keep track of the MDS's directory fragments
 105  * for a given inode (usually there is just a single fragment).  We
 106  * need to know when a child frag is delegated to a new MDS, or when
 107  * it is flagged as replicated, so we can direct our requests
 108  * accordingly.
 109  */
 110
 111 /*
 112  * find/create a frag in the tree
 113  */
 114 static struct ceph_inode_frag *__get_or_create_frag(struct ceph_inode_info *ci,
 115                                                     u32 f)
 116 {
 117         struct rb_node **p;
 118         struct rb_node *parent = NULL;
 119         struct ceph_inode_frag *frag;
 120         int c;
 121
 122         p = &ci->i_fragtree.rb_node;
 123         while (*p) {
 124                 parent = *p;
 125                 frag = rb_entry(parent, struct ceph_inode_frag, node);
 126                 c = ceph_frag_compare(f, frag->frag);
 127                 if (c < 0)
 128                         p = &(*p)->rb_left;
 129                 else if (c > 0)
 130                         p = &(*p)->rb_right;
 131                 else
 132                         return frag;
 133         }
 134
 135         frag = kmalloc(sizeof(*frag), GFP_NOFS);
 136         if (!frag)
 137                 return ERR_PTR(-ENOMEM);
 138
 139         frag->frag = f;
 140         frag->split_by = 0;
 141         frag->mds = -1;
 142         frag->ndist = 0;
 143
 144         rb_link_node(&frag->node, parent, p);
 145         rb_insert_color(&frag->node, &ci->i_fragtree);
 146
 147         dout("get_or_create_frag added %llx.%llx frag %x\n",
 148              ceph_vinop(&ci->vfs_inode), f);
 149         return frag;
 150 }
 151
 152 /*
 153  * find a specific frag @f
 154  */
 155 struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci, u32 f)
 156 {
 157         struct rb_node *n = ci->i_fragtree.rb_node;
 158
 159         while (n) {
 160                 struct ceph_inode_frag *frag =
 161                         rb_entry(n, struct ceph_inode_frag, node);
 162                 int c = ceph_frag_compare(f, frag->frag);
 163                 if (c < 0)
 164                         n = n->rb_left;
 165                 else if (c > 0)
 166                         n = n->rb_right;
 167                 else
 168                         return frag;
 169         }
 170         return NULL;
 171 }
 172
 173 /*
 174  * Choose frag containing the given value @v.  If @pfrag is
 175  * specified, copy the frag delegation info to the caller if
 176  * it is present.
 177  */
 178 static u32 __ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
 179                               struct ceph_inode_frag *pfrag, int *found)
 180 {
 181         u32 t = ceph_frag_make(0, 0);
 182         struct ceph_inode_frag *frag;
 183         unsigned nway, i;
 184         u32 n;
 185
 186         if (found)
 187                 *found = 0;
 188
 189         while (1) {
 190                 WARN_ON(!ceph_frag_contains_value(t, v));
 191                 frag = __ceph_find_frag(ci, t);
 192                 if (!frag)
 193                         break; /* t is a leaf */
 194                 if (frag->split_by == 0) {
 195                         if (pfrag)
 196                                 memcpy(pfrag, frag, sizeof(*pfrag));
 197                         if (found)
 198                                 *found = 1;
 199                         break;
 200                 }
 201
 202                 /* choose child */
 203                 nway = 1 << frag->split_by;
 204                 dout("choose_frag(%x) %x splits by %d (%d ways)\n", v, t,
 205                      frag->split_by, nway);
 206                 for (i = 0; i < nway; i++) {
 207                         n = ceph_frag_make_child(t, frag->split_by, i);
 208                         if (ceph_frag_contains_value(n, v)) {
 209                                 t = n;
 210                                 break;
 211                         }
 212                 }
 213                 BUG_ON(i == nway);
 214         }
 215         dout("choose_frag(%x) = %x\n", v, t);
 216
 217         return t;
 218 }
 219
 220 u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
 221                      struct ceph_inode_frag *pfrag, int *found)
 222 {
 223         u32 ret;
 224         mutex_lock(&ci->i_fragtree_mutex);
 225         ret = __ceph_choose_frag(ci, v, pfrag, found);
 226         mutex_unlock(&ci->i_fragtree_mutex);
 227         return ret;
 228 }
 229
 230 /*
 231  * Process dirfrag (delegation) info from the mds.  Include leaf
 232  * fragment in tree ONLY if ndist > 0.  Otherwise, only
 233  * branches/splits are included in i_fragtree)
 234  */
 235 static int ceph_fill_dirfrag(struct inode *inode,
 236                              struct ceph_mds_reply_dirfrag *dirinfo)
 237 {
 238         struct ceph_inode_info *ci = ceph_inode(inode);
 239         struct ceph_inode_frag *frag;
 240         u32 id = le32_to_cpu(dirinfo->frag);
 241         int mds = le32_to_cpu(dirinfo->auth);
 242         int ndist = le32_to_cpu(dirinfo->ndist);
 243         int diri_auth = -1;
 244         int i;
 245         int err = 0;
 246
 247         spin_lock(&ci->i_ceph_lock);
 248         if (ci->i_auth_cap)
 249                 diri_auth = ci->i_auth_cap->mds;
 250         spin_unlock(&ci->i_ceph_lock);
 251
 252         if (mds == -1) /* CDIR_AUTH_PARENT */
 253                 mds = diri_auth;
 254
 255         mutex_lock(&ci->i_fragtree_mutex);
 256         if (ndist == 0 && mds == diri_auth) {
 257                 /* no delegation info needed. */
 258                 frag = __ceph_find_frag(ci, id);
 259                 if (!frag)
 260                         goto out;
 261                 if (frag->split_by == 0) {
 262                         /* tree leaf, remove */
 263                         dout("fill_dirfrag removed %llx.%llx frag %x"
 264                              " (no ref)\n", ceph_vinop(inode), id);
 265                         rb_erase(&frag->node, &ci->i_fragtree);
 266                         kfree(frag);
 267                 } else {
 268                         /* tree branch, keep and clear */
 269                         dout("fill_dirfrag cleared %llx.%llx frag %x"
 270                              " referral\n", ceph_vinop(inode), id);
 271                         frag->mds = -1;
 272                         frag->ndist = 0;
 273                 }
 274                 goto out;
 275         }
 276
 277
 278         /* find/add this frag to store mds delegation info */
 279         frag = __get_or_create_frag(ci, id);
 280         if (IS_ERR(frag)) {
 281                 /* this is not the end of the world; we can continue
 282                    with bad/inaccurate delegation info */
 283                 pr_err("fill_dirfrag ENOMEM on mds ref %llx.%llx fg %x\n",
 284                        ceph_vinop(inode), le32_to_cpu(dirinfo->frag));
 285                 err = -ENOMEM;
 286                 goto out;
 287         }
 288
 289         frag->mds = mds;
 290         frag->ndist = min_t(u32, ndist, CEPH_MAX_DIRFRAG_REP);
 291         for (i = 0; i < frag->ndist; i++)
 292                 frag->dist[i] = le32_to_cpu(dirinfo->dist[i]);
 293         dout("fill_dirfrag %llx.%llx frag %x ndist=%d\n",
 294              ceph_vinop(inode), frag->frag, frag->ndist);
 295
 296 out:
 297         mutex_unlock(&ci->i_fragtree_mutex);
 298         return err;
 299 }
 300
 301 static int frag_tree_split_cmp(const void *l, const void *r)
 302 {
 303         struct ceph_frag_tree_split *ls = (struct ceph_frag_tree_split*)l;
 304         struct ceph_frag_tree_split *rs = (struct ceph_frag_tree_split*)r;
 305         return ceph_frag_compare(le32_to_cpu(ls->frag),
 306                                  le32_to_cpu(rs->frag));
 307 }
 308
 309 static bool is_frag_child(u32 f, struct ceph_inode_frag *frag)
 310 {
 311         if (!frag)
 312                 return f == ceph_frag_make(0, 0);
 313         if (ceph_frag_bits(f) != ceph_frag_bits(frag->frag) + frag->split_by)
 314                 return false;
 315         return ceph_frag_contains_value(frag->frag, ceph_frag_value(f));
 316 }
 317
 318 static int ceph_fill_fragtree(struct inode *inode,
 319                               struct ceph_frag_tree_head *fragtree,
 320                               struct ceph_mds_reply_dirfrag *dirinfo)
 321 {
 322         struct ceph_inode_info *ci = ceph_inode(inode);
 323         struct ceph_inode_frag *frag, *prev_frag = NULL;
 324         struct rb_node *rb_node;
 325         unsigned i, split_by, nsplits;
 326         u32 id;
 327         bool update = false;
 328
 329         mutex_lock(&ci->i_fragtree_mutex);
 330         nsplits = le32_to_cpu(fragtree->nsplits);
 331         if (nsplits != ci->i_fragtree_nsplits) {
 332                 update = true;
 333         } else if (nsplits) {
 334                 i = prandom_u32() % nsplits;
 335                 id = le32_to_cpu(fragtree->splits[i].frag);
 336                 if (!__ceph_find_frag(ci, id))
 337                         update = true;
 338         } else if (!RB_EMPTY_ROOT(&ci->i_fragtree)) {
 339                 rb_node = rb_first(&ci->i_fragtree);
 340                 frag = rb_entry(rb_node, struct ceph_inode_frag, node);
 341                 if (frag->frag != ceph_frag_make(0, 0) || rb_next(rb_node))
 342                         update = true;
 343         }
 344         if (!update && dirinfo) {
 345                 id = le32_to_cpu(dirinfo->frag);
 346                 if (id != __ceph_choose_frag(ci, id, NULL, NULL))
 347                         update = true;
 348         }
 349         if (!update)
 350                 goto out_unlock;
 351
 352         if (nsplits > 1) {
 353                 sort(fragtree->splits, nsplits, sizeof(fragtree->splits[0]),
 354                      frag_tree_split_cmp, NULL);
 355         }
 356
 357         dout("fill_fragtree %llx.%llx\n", ceph_vinop(inode));
 358         rb_node = rb_first(&ci->i_fragtree);
 359         for (i = 0; i < nsplits; i++) {
 360                 id = le32_to_cpu(fragtree->splits[i].frag);
 361                 split_by = le32_to_cpu(fragtree->splits[i].by);
 362                 if (split_by == 0 || ceph_frag_bits(id) + split_by > 24) {
 363                         pr_err("fill_fragtree %llx.%llx invalid split %d/%u, "
 364                                "frag %x split by %d\n", ceph_vinop(inode),
 365                                i, nsplits, id, split_by);
 366                         continue;
 367                 }
 368                 frag = NULL;
 369                 while (rb_node) {
 370                         frag = rb_entry(rb_node, struct ceph_inode_frag, node);
 371                         if (ceph_frag_compare(frag->frag, id) >= 0) {
 372                                 if (frag->frag != id)
 373                                         frag = NULL;
 374                                 else
 375                                         rb_node = rb_next(rb_node);
 376                                 break;
 377                         }
 378                         rb_node = rb_next(rb_node);
 379                         /* delete stale split/leaf node */
 380                         if (frag->split_by > 0 ||
 381                             !is_frag_child(frag->frag, prev_frag)) {
 382                                 rb_erase(&frag->node, &ci->i_fragtree);
 383                                 if (frag->split_by > 0)
 384                                         ci->i_fragtree_nsplits--;
 385                                 kfree(frag);
 386                         }
 387                         frag = NULL;
 388                 }
 389                 if (!frag) {
 390                         frag = __get_or_create_frag(ci, id);
 391                         if (IS_ERR(frag))
 392                                 continue;
 393                 }
 394                 if (frag->split_by == 0)
 395                         ci->i_fragtree_nsplits++;
 396                 frag->split_by = split_by;
 397                 dout(" frag %x split by %d\n", frag->frag, frag->split_by);
 398                 prev_frag = frag;
 399         }
 400         while (rb_node) {
 401                 frag = rb_entry(rb_node, struct ceph_inode_frag, node);
 402                 rb_node = rb_next(rb_node);
 403                 /* delete stale split/leaf node */
 404                 if (frag->split_by > 0 ||
 405                     !is_frag_child(frag->frag, prev_frag)) {
 406                         rb_erase(&frag->node, &ci->i_fragtree);
 407                         if (frag->split_by > 0)
 408                                 ci->i_fragtree_nsplits--;
 409                         kfree(frag);
 410                 }
 411         }
 412 out_unlock:
 413         mutex_unlock(&ci->i_fragtree_mutex);
 414         return 0;
 415 }
 416
 417 /*
 418  * initialize a newly allocated inode.
 419  */
 420 struct inode *ceph_alloc_inode(struct super_block *sb)
 421 {
 422         struct ceph_inode_info *ci;
 423         int i;
 424
 425         ci = kmem_cache_alloc(ceph_inode_cachep, GFP_NOFS);
 426         if (!ci)
 427                 return NULL;
 428
 429         dout("alloc_inode %p\n", &ci->vfs_inode);
 430
 431         spin_lock_init(&ci->i_ceph_lock);
 432
 433         ci->i_version = 0;
 434         ci->i_inline_version = 0;
 435         ci->i_time_warp_seq = 0;
 436         ci->i_ceph_flags = 0;
 437         atomic64_set(&ci->i_ordered_count, 1);
 438         atomic64_set(&ci->i_release_count, 1);
 439         atomic64_set(&ci->i_complete_seq[0], 0);
 440         atomic64_set(&ci->i_complete_seq[1], 0);
 441         ci->i_symlink = NULL;
 442
 443         memset(&ci->i_dir_layout, 0, sizeof(ci->i_dir_layout));
 444         RCU_INIT_POINTER(ci->i_layout.pool_ns, NULL);
 445
 446         ci->i_fragtree = RB_ROOT;
 447         mutex_init(&ci->i_fragtree_mutex);
 448
 449         ci->i_xattrs.blob = NULL;
 450         ci->i_xattrs.prealloc_blob = NULL;
 451         ci->i_xattrs.dirty = false;
 452         ci->i_xattrs.index = RB_ROOT;
 453         ci->i_xattrs.count = 0;
 454         ci->i_xattrs.names_size = 0;
 455         ci->i_xattrs.vals_size = 0;
 456         ci->i_xattrs.version = 0;
 457         ci->i_xattrs.index_version = 0;
 458
 459         ci->i_caps = RB_ROOT;
 460         ci->i_auth_cap = NULL;
 461         ci->i_dirty_caps = 0;
 462         ci->i_flushing_caps = 0;
 463         INIT_LIST_HEAD(&ci->i_dirty_item);
 464         INIT_LIST_HEAD(&ci->i_flushing_item);
 465         ci->i_prealloc_cap_flush = NULL;
 466         INIT_LIST_HEAD(&ci->i_cap_flush_list);
 467         init_waitqueue_head(&ci->i_cap_wq);
 468         ci->i_hold_caps_min = 0;
 469         ci->i_hold_caps_max = 0;
 470         INIT_LIST_HEAD(&ci->i_cap_delay_list);
 471         INIT_LIST_HEAD(&ci->i_cap_snaps);
 472         ci->i_head_snapc = NULL;
 473         ci->i_snap_caps = 0;
 474
 475         for (i = 0; i < CEPH_FILE_MODE_BITS; i++)
 476                 ci->i_nr_by_mode[i] = 0;
 477
 478         mutex_init(&ci->i_truncate_mutex);
 479         ci->i_truncate_seq = 0;
 480         ci->i_truncate_size = 0;
 481         ci->i_truncate_pending = 0;
 482
 483         ci->i_max_size = 0;
 484         ci->i_reported_size = 0;
 485         ci->i_wanted_max_size = 0;
 486         ci->i_requested_max_size = 0;
 487
 488         ci->i_pin_ref = 0;
 489         ci->i_rd_ref = 0;
 490         ci->i_rdcache_ref = 0;
 491         ci->i_wr_ref = 0;
 492         ci->i_wb_ref = 0;
 493         ci->i_wrbuffer_ref = 0;
 494         ci->i_wrbuffer_ref_head = 0;
 495         ci->i_shared_gen = 0;
 496         ci->i_rdcache_gen = 0;
 497         ci->i_rdcache_revoking = 0;
 498
 499         INIT_LIST_HEAD(&ci->i_unsafe_dirops);
 500         INIT_LIST_HEAD(&ci->i_unsafe_iops);
 501         spin_lock_init(&ci->i_unsafe_lock);
 502
 503         ci->i_snap_realm = NULL;
 504         INIT_LIST_HEAD(&ci->i_snap_realm_item);
 505         INIT_LIST_HEAD(&ci->i_snap_flush_item);
 506
 507         INIT_WORK(&ci->i_wb_work, ceph_writeback_work);
 508         INIT_WORK(&ci->i_pg_inv_work, ceph_invalidate_work);
 509
 510         INIT_WORK(&ci->i_vmtruncate_work, ceph_vmtruncate_work);
 511
 512         ceph_fscache_inode_init(ci);
 513
 514         return &ci->vfs_inode;
 515 }
 516
 517 static void ceph_i_callback(struct rcu_head *head)
 518 {
 519         struct inode *inode = container_of(head, struct inode, i_rcu);
 520         struct ceph_inode_info *ci = ceph_inode(inode);
 521
 522         kmem_cache_free(ceph_inode_cachep, ci);
 523 }
 524
 525 void ceph_destroy_inode(struct inode *inode)
 526 {
 527         struct ceph_inode_info *ci = ceph_inode(inode);
 528         struct ceph_inode_frag *frag;
 529         struct rb_node *n;
 530
 531         dout("destroy_inode %p ino %llx.%llx\n", inode, ceph_vinop(inode));
 532
 533         ceph_fscache_unregister_inode_cookie(ci);
 534
 535         ceph_queue_caps_release(inode);
 536
 537         /*
 538          * we may still have a snap_realm reference if there are stray
 539          * caps in i_snap_caps.
 540          */
 541         if (ci->i_snap_realm) {
 542                 struct ceph_mds_client *mdsc =
 543                         ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc;
 544                 struct ceph_snap_realm *realm = ci->i_snap_realm;
 545
 546                 dout(" dropping residual ref to snap realm %p\n", realm);
 547                 spin_lock(&realm->inodes_with_caps_lock);
 548                 list_del_init(&ci->i_snap_realm_item);
 549                 spin_unlock(&realm->inodes_with_caps_lock);
 550                 ceph_put_snap_realm(mdsc, realm);
 551         }
 552
 553         kfree(ci->i_symlink);
 554         while ((n = rb_first(&ci->i_fragtree)) != NULL) {
 555                 frag = rb_entry(n, struct ceph_inode_frag, node);
 556                 rb_erase(n, &ci->i_fragtree);
 557                 kfree(frag);
 558         }
 559         ci->i_fragtree_nsplits = 0;
 560
 561         __ceph_destroy_xattrs(ci);
 562         if (ci->i_xattrs.blob)
 563                 ceph_buffer_put(ci->i_xattrs.blob);
 564         if (ci->i_xattrs.prealloc_blob)
 565                 ceph_buffer_put(ci->i_xattrs.prealloc_blob);
 566
 567         ceph_put_string(rcu_dereference_raw(ci->i_layout.pool_ns));
 568
 569         call_rcu(&inode->i_rcu, ceph_i_callback);
 570 }
 571
 572 int ceph_drop_inode(struct inode *inode)
 573 {
 574         /*
 575          * Positve dentry and corresponding inode are always accompanied
 576          * in MDS reply. So no need to keep inode in the cache after
 577          * dropping all its aliases.
 578          */
 579         return 1;
 580 }
 581
 582 static inline blkcnt_t calc_inode_blocks(u64 size)
 583 {
 584         return (size + (1<<9) - 1) >> 9;
 585 }
 586
 587 /*
 588  * Helpers to fill in size, ctime, mtime, and atime.  We have to be
 589  * careful because either the client or MDS may have more up to date
 590  * info, depending on which capabilities are held, and whether
 591  * time_warp_seq or truncate_seq have increased.  (Ordinarily, mtime
 592  * and size are monotonically increasing, except when utimes() or
 593  * truncate() increments the corresponding _seq values.)
 594  */
 595 int ceph_fill_file_size(struct inode *inode, int issued,
 596                         u32 truncate_seq, u64 truncate_size, u64 size)
 597 {
 598         struct ceph_inode_info *ci = ceph_inode(inode);
 599         int queue_trunc = 0;
 600
 601         if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) > 0 ||
 602             (truncate_seq == ci->i_truncate_seq && size > inode->i_size)) {
 603                 dout("size %lld -> %llu\n", inode->i_size, size);
 604                 if (size > 0 && S_ISDIR(inode->i_mode)) {
 605                         pr_err("fill_file_size non-zero size for directory\n");
 606                         size = 0;
 607                 }
 608                 i_size_write(inode, size);
 609                 inode->i_blocks = calc_inode_blocks(size);
 610                 ci->i_reported_size = size;
 611                 if (truncate_seq != ci->i_truncate_seq) {
 612                         dout("truncate_seq %u -> %u\n",
 613                              ci->i_truncate_seq, truncate_seq);
 614                         ci->i_truncate_seq = truncate_seq;
 615
 616                         /* the MDS should have revoked these caps */
 617                         WARN_ON_ONCE(issued & (CEPH_CAP_FILE_EXCL |
 618                                                CEPH_CAP_FILE_RD |
 619                                                CEPH_CAP_FILE_WR |
 620                                                CEPH_CAP_FILE_LAZYIO));
 621                         /*
 622                          * If we hold relevant caps, or in the case where we're
 623                          * not the only client referencing this file and we
 624                          * don't hold those caps, then we need to check whether
 625                          * the file is either opened or mmaped
 626                          */
 627                         if ((issued & (CEPH_CAP_FILE_CACHE|
 628                                        CEPH_CAP_FILE_BUFFER)) ||
 629                             mapping_mapped(inode->i_mapping) ||
 630                             __ceph_caps_file_wanted(ci)) {
 631                                 ci->i_truncate_pending++;
 632                                 queue_trunc = 1;
 633                         }
 634                 }
 635         }
 636         if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) >= 0 &&
 637             ci->i_truncate_size != truncate_size) {
 638                 dout("truncate_size %lld -> %llu\n", ci->i_truncate_size,
 639                      truncate_size);
 640                 ci->i_truncate_size = truncate_size;
 641         }
 642
 643         if (queue_trunc)
 644                 ceph_fscache_invalidate(inode);
 645
 646         return queue_trunc;
 647 }
 648
 649 void ceph_fill_file_time(struct inode *inode, int issued,
 650                          u64 time_warp_seq, struct timespec *ctime,
 651                          struct timespec *mtime, struct timespec *atime)
 652 {
 653         struct ceph_inode_info *ci = ceph_inode(inode);
 654         int warn = 0;
 655
 656         if (issued & (CEPH_CAP_FILE_EXCL|
 657                       CEPH_CAP_FILE_WR|
 658                       CEPH_CAP_FILE_BUFFER|
 659                       CEPH_CAP_AUTH_EXCL|
 660                       CEPH_CAP_XATTR_EXCL)) {
 661                 if (timespec_compare(ctime, &inode->i_ctime) > 0) {
 662                         dout("ctime %ld.%09ld -> %ld.%09ld inc w/ cap\n",
 663                              inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
 664                              ctime->tv_sec, ctime->tv_nsec);
 665                         inode->i_ctime = *ctime;
 666                 }
 667                 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) > 0) {
 668                         /* the MDS did a utimes() */
 669                         dout("mtime %ld.%09ld -> %ld.%09ld "
 670                              "tw %d -> %d\n",
 671                              inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
 672                              mtime->tv_sec, mtime->tv_nsec,
 673                              ci->i_time_warp_seq, (int)time_warp_seq);
 674
 675                         inode->i_mtime = *mtime;
 676                         inode->i_atime = *atime;
 677                         ci->i_time_warp_seq = time_warp_seq;
 678                 } else if (time_warp_seq == ci->i_time_warp_seq) {
 679                         /* nobody did utimes(); take the max */
 680                         if (timespec_compare(mtime, &inode->i_mtime) > 0) {
 681                                 dout("mtime %ld.%09ld -> %ld.%09ld inc\n",
 682                                      inode->i_mtime.tv_sec,
 683                                      inode->i_mtime.tv_nsec,
 684                                      mtime->tv_sec, mtime->tv_nsec);
 685                                 inode->i_mtime = *mtime;
 686                         }
 687                         if (timespec_compare(atime, &inode->i_atime) > 0) {
 688                                 dout("atime %ld.%09ld -> %ld.%09ld inc\n",
 689                                      inode->i_atime.tv_sec,
 690                                      inode->i_atime.tv_nsec,
 691                                      atime->tv_sec, atime->tv_nsec);
 692                                 inode->i_atime = *atime;
 693                         }
 694                 } else if (issued & CEPH_CAP_FILE_EXCL) {
 695                         /* we did a utimes(); ignore mds values */
 696                 } else {
 697                         warn = 1;
 698                 }
 699         } else {
 700                 /* we have no write|excl caps; whatever the MDS says is true */
 701                 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) >= 0) {
 702                         inode->i_ctime = *ctime;
 703                         inode->i_mtime = *mtime;
 704                         inode->i_atime = *atime;
 705                         ci->i_time_warp_seq = time_warp_seq;
 706                 } else {
 707                         warn = 1;
 708                 }
 709         }
 710         if (warn) /* time_warp_seq shouldn't go backwards */
 711                 dout("%p mds time_warp_seq %llu < %u\n",
 712                      inode, time_warp_seq, ci->i_time_warp_seq);
 713 }
 714
 715 /*
 716  * Populate an inode based on info from mds.  May be called on new or
 717  * existing inodes.
 718  */
 719 static int fill_inode(struct inode *inode, struct page *locked_page,
 720                       struct ceph_mds_reply_info_in *iinfo,
 721                       struct ceph_mds_reply_dirfrag *dirinfo,
 722                       struct ceph_mds_session *session,
 723                       unsigned long ttl_from, int cap_fmode,
 724                       struct ceph_cap_reservation *caps_reservation)
 725 {
 726         struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
 727         struct ceph_mds_reply_inode *info = iinfo->in;
 728         struct ceph_inode_info *ci = ceph_inode(inode);
 729         int issued = 0, implemented, new_issued;
 730         struct timespec mtime, atime, ctime;
 731         struct ceph_buffer *xattr_blob = NULL;
 732         struct ceph_string *pool_ns = NULL;
 733         struct ceph_cap *new_cap = NULL;
 734         int err = 0;
 735         bool wake = false;
 736         bool queue_trunc = false;
 737         bool new_version = false;
 738         bool fill_inline = false;
 739
 740         dout("fill_inode %p ino %llx.%llx v %llu had %llu\n",
 741              inode, ceph_vinop(inode), le64_to_cpu(info->version),
 742              ci->i_version);
 743
 744         /* prealloc new cap struct */
 745         if (info->cap.caps && ceph_snap(inode) == CEPH_NOSNAP)
 746                 new_cap = ceph_get_cap(mdsc, caps_reservation);
 747
 748         /*
 749          * prealloc xattr data, if it looks like we'll need it.  only
 750          * if len > 4 (meaning there are actually xattrs; the first 4
 751          * bytes are the xattr count).
 752          */
 753         if (iinfo->xattr_len > 4) {
 754                 xattr_blob = ceph_buffer_new(iinfo->xattr_len, GFP_NOFS);
 755                 if (!xattr_blob)
 756                         pr_err("fill_inode ENOMEM xattr blob %d bytes\n",
 757                                iinfo->xattr_len);
 758         }
 759
 760         if (iinfo->pool_ns_len > 0)
 761                 pool_ns = ceph_find_or_create_string(iinfo->pool_ns_data,
 762                                                      iinfo->pool_ns_len);
 763
 764         spin_lock(&ci->i_ceph_lock);
 765
 766         /*
 767          * provided version will be odd if inode value is projected,
 768          * even if stable.  skip the update if we have newer stable
 769          * info (ours>=theirs, e.g. due to racing mds replies), unless
 770          * we are getting projected (unstable) info (in which case the
 771          * version is odd, and we want ours>theirs).
 772          *   us   them
 773          *   2    2     skip
 774          *   3    2     skip
 775          *   3    3     update
 776          */
 777         if (ci->i_version == 0 ||
 778             ((info->cap.flags & CEPH_CAP_FLAG_AUTH) &&
 779              le64_to_cpu(info->version) > (ci->i_version & ~1)))
 780                 new_version = true;
 781
 782         issued = __ceph_caps_issued(ci, &implemented);
 783         issued |= implemented | __ceph_caps_dirty(ci);
 784         new_issued = ~issued & le32_to_cpu(info->cap.caps);
 785
 786         /* update inode */
 787         ci->i_version = le64_to_cpu(info->version);
 788         inode->i_version++;
 789         inode->i_rdev = le32_to_cpu(info->rdev);
 790         inode->i_blkbits = fls(le32_to_cpu(info->layout.fl_stripe_unit)) - 1;
 791
 792         if ((new_version || (new_issued & CEPH_CAP_AUTH_SHARED)) &&
 793             (issued & CEPH_CAP_AUTH_EXCL) == 0) {
 794                 inode->i_mode = le32_to_cpu(info->mode);
 795                 inode->i_uid = make_kuid(&init_user_ns, le32_to_cpu(info->uid));
 796                 inode->i_gid = make_kgid(&init_user_ns, le32_to_cpu(info->gid));
 797                 dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode,
 798                      from_kuid(&init_user_ns, inode->i_uid),
 799                      from_kgid(&init_user_ns, inode->i_gid));
 800         }
 801
 802         if ((new_version || (new_issued & CEPH_CAP_LINK_SHARED)) &&
 803             (issued & CEPH_CAP_LINK_EXCL) == 0)
 804                 set_nlink(inode, le32_to_cpu(info->nlink));
 805
 806         if (new_version || (new_issued & CEPH_CAP_ANY_RD)) {
 807                 /* be careful with mtime, atime, size */
 808                 ceph_decode_timespec(&atime, &info->atime);
 809                 ceph_decode_timespec(&mtime, &info->mtime);
 810                 ceph_decode_timespec(&ctime, &info->ctime);
 811                 ceph_fill_file_time(inode, issued,
 812                                 le32_to_cpu(info->time_warp_seq),
 813                                 &ctime, &mtime, &atime);
 814         }
 815
 816         if (new_version ||
 817             (new_issued & (CEPH_CAP_ANY_FILE_RD | CEPH_CAP_ANY_FILE_WR))) {
 818                 s64 old_pool = ci->i_layout.pool_id;
 819                 struct ceph_string *old_ns;
 820
 821                 ceph_file_layout_from_legacy(&ci->i_layout, &info->layout);
 822                 old_ns = rcu_dereference_protected(ci->i_layout.pool_ns,
 823                                         lockdep_is_held(&ci->i_ceph_lock));
 824                 rcu_assign_pointer(ci->i_layout.pool_ns, pool_ns);
 825
 826                 if (ci->i_layout.pool_id != old_pool || pool_ns != old_ns)
 827                         ci->i_ceph_flags &= ~CEPH_I_POOL_PERM;
 828
 829                 pool_ns = old_ns;
 830
 831                 queue_trunc = ceph_fill_file_size(inode, issued,
 832                                         le32_to_cpu(info->truncate_seq),
 833                                         le64_to_cpu(info->truncate_size),
 834                                         le64_to_cpu(info->size));
 835                 /* only update max_size on auth cap */
 836                 if ((info->cap.flags & CEPH_CAP_FLAG_AUTH) &&
 837                     ci->i_max_size != le64_to_cpu(info->max_size)) {
 838                         dout("max_size %lld -> %llu\n", ci->i_max_size,
 839                                         le64_to_cpu(info->max_size));
 840                         ci->i_max_size = le64_to_cpu(info->max_size);
 841                 }
 842         }
 843
 844         /* xattrs */
 845         /* note that if i_xattrs.len <= 4, i_xattrs.data will still be NULL. */
 846         if ((ci->i_xattrs.version == 0 || !(issued & CEPH_CAP_XATTR_EXCL))  &&
 847             le64_to_cpu(info->xattr_version) > ci->i_xattrs.version) {
 848                 if (ci->i_xattrs.blob)
 849                         ceph_buffer_put(ci->i_xattrs.blob);
 850                 ci->i_xattrs.blob = xattr_blob;
 851                 if (xattr_blob)
 852                         memcpy(ci->i_xattrs.blob->vec.iov_base,
 853                                iinfo->xattr_data, iinfo->xattr_len);
 854                 ci->i_xattrs.version = le64_to_cpu(info->xattr_version);
 855                 ceph_forget_all_cached_acls(inode);
 856                 xattr_blob = NULL;
 857         }
 858
 859         inode->i_mapping->a_ops = &ceph_aops;
 860
 861         switch (inode->i_mode & S_IFMT) {
 862         case S_IFIFO:
 863         case S_IFBLK:
 864         case S_IFCHR:
 865         case S_IFSOCK:
 866                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
 867                 inode->i_op = &ceph_file_iops;
 868                 break;
 869         case S_IFREG:
 870                 inode->i_op = &ceph_file_iops;
 871                 inode->i_fop = &ceph_file_fops;
 872                 break;
 873         case S_IFLNK:
 874                 inode->i_op = &ceph_symlink_iops;
 875                 if (!ci->i_symlink) {
 876                         u32 symlen = iinfo->symlink_len;
 877                         char *sym;
 878
 879                         spin_unlock(&ci->i_ceph_lock);
 880
 881                         if (symlen != i_size_read(inode)) {
 882                                 pr_err("fill_inode %llx.%llx BAD symlink "
 883                                         "size %lld\n", ceph_vinop(inode),
 884                                         i_size_read(inode));
 885                                 i_size_write(inode, symlen);
 886                                 inode->i_blocks = calc_inode_blocks(symlen);
 887                         }
 888
 889                         err = -ENOMEM;
 890                         sym = kstrndup(iinfo->symlink, symlen, GFP_NOFS);
 891                         if (!sym)
 892                                 goto out;
 893
 894                         spin_lock(&ci->i_ceph_lock);
 895                         if (!ci->i_symlink)
 896                                 ci->i_symlink = sym;
 897                         else
 898                                 kfree(sym); /* lost a race */
 899                 }
 900                 inode->i_link = ci->i_symlink;
 901                 break;
 902         case S_IFDIR:
 903                 inode->i_op = &ceph_dir_iops;
 904                 inode->i_fop = &ceph_dir_fops;
 905
 906                 ci->i_dir_layout = iinfo->dir_layout;
 907
 908                 ci->i_files = le64_to_cpu(info->files);
 909                 ci->i_subdirs = le64_to_cpu(info->subdirs);
 910                 ci->i_rbytes = le64_to_cpu(info->rbytes);
 911                 ci->i_rfiles = le64_to_cpu(info->rfiles);
 912                 ci->i_rsubdirs = le64_to_cpu(info->rsubdirs);
 913                 ceph_decode_timespec(&ci->i_rctime, &info->rctime);
 914                 break;
 915         default:
 916                 pr_err("fill_inode %llx.%llx BAD mode 0%o\n",
 917                        ceph_vinop(inode), inode->i_mode);
 918         }
 919
 920         /* were we issued a capability? */
 921         if (info->cap.caps) {
 922                 if (ceph_snap(inode) == CEPH_NOSNAP) {
 923                         unsigned caps = le32_to_cpu(info->cap.caps);
 924                         ceph_add_cap(inode, session,
 925                                      le64_to_cpu(info->cap.cap_id),
 926                                      cap_fmode, caps,
 927                                      le32_to_cpu(info->cap.wanted),
 928                                      le32_to_cpu(info->cap.seq),
 929                                      le32_to_cpu(info->cap.mseq),
 930                                      le64_to_cpu(info->cap.realm),
 931                                      info->cap.flags, &new_cap);
 932
 933                         /* set dir completion flag? */
 934                         if (S_ISDIR(inode->i_mode) &&
 935                             ci->i_files == 0 && ci->i_subdirs == 0 &&
 936                             (caps & CEPH_CAP_FILE_SHARED) &&
 937                             (issued & CEPH_CAP_FILE_EXCL) == 0 &&
 938                             !__ceph_dir_is_complete(ci)) {
 939                                 dout(" marking %p complete (empty)\n", inode);
 940                                 i_size_write(inode, 0);
 941                                 __ceph_dir_set_complete(ci,
 942                                         atomic64_read(&ci->i_release_count),
 943                                         atomic64_read(&ci->i_ordered_count));
 944                         }
 945
 946                         wake = true;
 947                 } else {
 948                         dout(" %p got snap_caps %s\n", inode,
 949                              ceph_cap_string(le32_to_cpu(info->cap.caps)));
 950                         ci->i_snap_caps |= le32_to_cpu(info->cap.caps);
 951                         if (cap_fmode >= 0)
 952                                 __ceph_get_fmode(ci, cap_fmode);
 953                 }
 954         } else if (cap_fmode >= 0) {
 955                 pr_warn("mds issued no caps on %llx.%llx\n",
 956                            ceph_vinop(inode));
 957                 __ceph_get_fmode(ci, cap_fmode);
 958         }
 959
 960         if (iinfo->inline_version > 0 &&
 961             iinfo->inline_version >= ci->i_inline_version) {
 962                 int cache_caps = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO;
 963                 ci->i_inline_version = iinfo->inline_version;
 964                 if (ci->i_inline_version != CEPH_INLINE_NONE &&
 965                     (locked_page ||
 966                      (le32_to_cpu(info->cap.caps) & cache_caps)))
 967                         fill_inline = true;
 968         }
 969
 970         spin_unlock(&ci->i_ceph_lock);
 971
 972         if (fill_inline)
 973                 ceph_fill_inline_data(inode, locked_page,
 974                                       iinfo->inline_data, iinfo->inline_len);
 975
 976         if (wake)
 977                 wake_up_all(&ci->i_cap_wq);
 978
 979         /* queue truncate if we saw i_size decrease */
 980         if (queue_trunc)
 981                 ceph_queue_vmtruncate(inode);
 982
 983         /* populate frag tree */
 984         if (S_ISDIR(inode->i_mode))
 985                 ceph_fill_fragtree(inode, &info->fragtree, dirinfo);
 986
 987         /* update delegation info? */
 988         if (dirinfo)
 989                 ceph_fill_dirfrag(inode, dirinfo);
 990
 991         err = 0;
 992 out:
 993         if (new_cap)
 994                 ceph_put_cap(mdsc, new_cap);
 995         if (xattr_blob)
 996                 ceph_buffer_put(xattr_blob);
 997         ceph_put_string(pool_ns);
 998         return err;
 999 }
1000
1001 /*
1002  * caller should hold session s_mutex.
1003  */
1004 static void update_dentry_lease(struct dentry *dentry,
1005                                 struct ceph_mds_reply_lease *lease,
1006                                 struct ceph_mds_session *session,
1007                                 unsigned long from_time,
1008                                 struct ceph_vino *tgt_vino,
1009                                 struct ceph_vino *dir_vino)
1010 {
1011         struct ceph_dentry_info *di = ceph_dentry(dentry);
1012         long unsigned duration = le32_to_cpu(lease->duration_ms);
1013         long unsigned ttl = from_time + (duration * HZ) / 1000;
1014         long unsigned half_ttl = from_time + (duration * HZ / 2) / 1000;
1015         struct inode *dir;
1016         struct ceph_mds_session *old_lease_session = NULL;
1017
1018         /*
1019          * Make sure dentry's inode matches tgt_vino. NULL tgt_vino means that
1020          * we expect a negative dentry.
1021          */
1022         if (!tgt_vino && d_really_is_positive(dentry))
1023                 return;
1024
1025         if (tgt_vino && (d_really_is_negative(dentry) ||
1026                         !ceph_ino_compare(d_inode(dentry), tgt_vino)))
1027                 return;
1028
1029         spin_lock(&dentry->d_lock);
1030         dout("update_dentry_lease %p duration %lu ms ttl %lu\n",
1031              dentry, duration, ttl);
1032
1033         dir = d_inode(dentry->d_parent);
1034
1035         /* make sure parent matches dir_vino */
1036         if (!ceph_ino_compare(dir, dir_vino))
1037                 goto out_unlock;
1038
1039         /* only track leases on regular dentries */
1040         if (ceph_snap(dir) != CEPH_NOSNAP)
1041                 goto out_unlock;
1042
1043         di->lease_shared_gen = ceph_inode(dir)->i_shared_gen;
1044
1045         if (duration == 0)
1046                 goto out_unlock;
1047
1048         if (di->lease_gen == session->s_cap_gen &&
1049             time_before(ttl, di->time))
1050                 goto out_unlock;  /* we already have a newer lease. */
1051
1052         if (di->lease_session && di->lease_session != session) {
1053                 old_lease_session = di->lease_session;
1054                 di->lease_session = NULL;
1055         }
1056
1057         ceph_dentry_lru_touch(dentry);
1058
1059         if (!di->lease_session)
1060                 di->lease_session = ceph_get_mds_session(session);
1061         di->lease_gen = session->s_cap_gen;
1062         di->lease_seq = le32_to_cpu(lease->seq);
1063         di->lease_renew_after = half_ttl;
1064         di->lease_renew_from = 0;
1065         di->time = ttl;
1066 out_unlock:
1067         spin_unlock(&dentry->d_lock);
1068         if (old_lease_session)
1069                 ceph_put_mds_session(old_lease_session);
1070 }
1071
1072 /*
1073  * splice a dentry to an inode.
1074  * caller must hold directory i_mutex for this to be safe.
1075  */
1076 static struct dentry *splice_dentry(struct dentry *dn, struct inode *in)
1077 {
1078         struct dentry *realdn;
1079
1080         BUG_ON(d_inode(dn));
1081
1082         /* dn must be unhashed */
1083         if (!d_unhashed(dn))
1084                 d_drop(dn);
1085         realdn = d_splice_alias(in, dn);
1086         if (IS_ERR(realdn)) {
1087                 pr_err("splice_dentry error %ld %p inode %p ino %llx.%llx\n",
1088                        PTR_ERR(realdn), dn, in, ceph_vinop(in));
1089                 dn = realdn; /* note realdn contains the error */
1090                 goto out;
1091         } else if (realdn) {
1092                 dout("dn %p (%d) spliced with %p (%d) "
1093                      "inode %p ino %llx.%llx\n",
1094                      dn, d_count(dn),
1095                      realdn, d_count(realdn),
1096                      d_inode(realdn), ceph_vinop(d_inode(realdn)));
1097                 dput(dn);
1098                 dn = realdn;
1099         } else {
1100                 BUG_ON(!ceph_dentry(dn));
1101                 dout("dn %p attached to %p ino %llx.%llx\n",
1102                      dn, d_inode(dn), ceph_vinop(d_inode(dn)));
1103         }
1104 out:
1105         return dn;
1106 }
1107
1108 /*
1109  * Incorporate results into the local cache.  This is either just
1110  * one inode, or a directory, dentry, and possibly linked-to inode (e.g.,
1111  * after a lookup).
1112  *
1113  * A reply may contain
1114  *         a directory inode along with a dentry.
1115  *  and/or a target inode
1116  *
1117  * Called with snap_rwsem (read).
1118  */
1119 int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req)
1120 {
1121         struct ceph_mds_session *session = req->r_session;
1122         struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1123         struct inode *in = NULL;
1124         struct ceph_vino tvino, dvino;
1125         struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
1126         int err = 0;
1127
1128         dout("fill_trace %p is_dentry %d is_target %d\n", req,
1129              rinfo->head->is_dentry, rinfo->head->is_target);
1130
1131         if (!rinfo->head->is_target && !rinfo->head->is_dentry) {
1132                 dout("fill_trace reply is empty!\n");
1133                 if (rinfo->head->result == 0 && req->r_parent)
1134                         ceph_invalidate_dir_request(req);
1135                 return 0;
1136         }
1137
1138         if (rinfo->head->is_dentry) {
1139                 struct inode *dir = req->r_parent;
1140
1141                 if (dir) {
1142                         err = fill_inode(dir, NULL,
1143                                          &rinfo->diri, rinfo->dirfrag,
1144                                          session, req->r_request_started, -1,
1145                                          &req->r_caps_reservation);
1146                         if (err < 0)
1147                                 goto done;
1148                 } else {
1149                         WARN_ON_ONCE(1);
1150                 }
1151
1152                 if (dir && req->r_op == CEPH_MDS_OP_LOOKUPNAME) {
1153                         struct qstr dname;
1154                         struct dentry *dn, *parent;
1155
1156                         BUG_ON(!rinfo->head->is_target);
1157                         BUG_ON(req->r_dentry);
1158
1159                         parent = d_find_any_alias(dir);
1160                         BUG_ON(!parent);
1161
1162                         dname.name = rinfo->dname;
1163                         dname.len = rinfo->dname_len;
1164                         dname.hash = full_name_hash(parent, dname.name, dname.len);
1165                         tvino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1166                         tvino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1167 retry_lookup:
1168                         dn = d_lookup(parent, &dname);
1169                         dout("d_lookup on parent=%p name=%.*s got %p\n",
1170                              parent, dname.len, dname.name, dn);
1171
1172                         if (!dn) {
1173                                 dn = d_alloc(parent, &dname);
1174                                 dout("d_alloc %p '%.*s' = %p\n", parent,
1175                                      dname.len, dname.name, dn);
1176                                 if (!dn) {
1177                                         dput(parent);
1178                                         err = -ENOMEM;
1179                                         goto done;
1180                                 }
1181                                 err = 0;
1182                         } else if (d_really_is_positive(dn) &&
1183                                    (ceph_ino(d_inode(dn)) != tvino.ino ||
1184                                     ceph_snap(d_inode(dn)) != tvino.snap)) {
1185                                 dout(" dn %p points to wrong inode %p\n",
1186                                      dn, d_inode(dn));
1187                                 d_delete(dn);
1188                                 dput(dn);
1189                                 goto retry_lookup;
1190                         }
1191
1192                         req->r_dentry = dn;
1193                         dput(parent);
1194                 }
1195         }
1196
1197         if (rinfo->head->is_target) {
1198                 tvino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1199                 tvino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1200
1201                 in = ceph_get_inode(sb, tvino);
1202                 if (IS_ERR(in)) {
1203                         err = PTR_ERR(in);
1204                         goto done;
1205                 }
1206                 req->r_target_inode = in;
1207
1208                 err = fill_inode(in, req->r_locked_page, &rinfo->targeti, NULL,
1209                                 session, req->r_request_started,
1210                                 (!test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags) &&
1211                                 rinfo->head->result == 0) ?  req->r_fmode : -1,
1212                                 &req->r_caps_reservation);
1213                 if (err < 0) {
1214                         pr_err("fill_inode badness %p %llx.%llx\n",
1215                                 in, ceph_vinop(in));
1216                         goto done;
1217                 }
1218         }
1219
1220         /*
1221          * ignore null lease/binding on snapdir ENOENT, or else we
1222          * will have trouble splicing in the virtual snapdir later
1223          */
1224         if (rinfo->head->is_dentry &&
1225             !test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags) &&
1226             test_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags) &&
1227             (rinfo->head->is_target || strncmp(req->r_dentry->d_name.name,
1228                                                fsc->mount_options->snapdir_name,
1229                                                req->r_dentry->d_name.len))) {
1230                 /*
1231                  * lookup link rename   : null -> possibly existing inode
1232                  * mknod symlink mkdir  : null -> new inode
1233                  * unlink               : linked -> null
1234                  */
1235                 struct inode *dir = req->r_parent;
1236                 struct dentry *dn = req->r_dentry;
1237                 bool have_dir_cap, have_lease;
1238
1239                 BUG_ON(!dn);
1240                 BUG_ON(!dir);
1241                 BUG_ON(d_inode(dn->d_parent) != dir);
1242
1243                 dvino.ino = le64_to_cpu(rinfo->diri.in->ino);
1244                 dvino.snap = le64_to_cpu(rinfo->diri.in->snapid);
1245
1246                 BUG_ON(ceph_ino(dir) != dvino.ino);
1247                 BUG_ON(ceph_snap(dir) != dvino.snap);
1248
1249                 /* do we have a lease on the whole dir? */
1250                 have_dir_cap =
1251                         (le32_to_cpu(rinfo->diri.in->cap.caps) &
1252                          CEPH_CAP_FILE_SHARED);
1253
1254                 /* do we have a dn lease? */
1255                 have_lease = have_dir_cap ||
1256                         le32_to_cpu(rinfo->dlease->duration_ms);
1257                 if (!have_lease)
1258                         dout("fill_trace  no dentry lease or dir cap\n");
1259
1260                 /* rename? */
1261                 if (req->r_old_dentry && req->r_op == CEPH_MDS_OP_RENAME) {
1262                         struct inode *olddir = req->r_old_dentry_dir;
1263                         BUG_ON(!olddir);
1264
1265                         dout(" src %p '%pd' dst %p '%pd'\n",
1266                              req->r_old_dentry,
1267                              req->r_old_dentry,
1268                              dn, dn);
1269                         dout("fill_trace doing d_move %p -> %p\n",
1270                              req->r_old_dentry, dn);
1271
1272                         /* d_move screws up sibling dentries' offsets */
1273                         ceph_dir_clear_ordered(dir);
1274                         ceph_dir_clear_ordered(olddir);
1275
1276                         d_move(req->r_old_dentry, dn);
1277                         dout(" src %p '%pd' dst %p '%pd'\n",
1278                              req->r_old_dentry,
1279                              req->r_old_dentry,
1280                              dn, dn);
1281
1282                         /* ensure target dentry is invalidated, despite
1283                            rehashing bug in vfs_rename_dir */
1284                         ceph_invalidate_dentry_lease(dn);
1285
1286                         dout("dn %p gets new offset %lld\n", req->r_old_dentry,
1287                              ceph_dentry(req->r_old_dentry)->offset);
1288
1289                         dn = req->r_old_dentry;  /* use old_dentry */
1290                 }
1291
1292                 /* null dentry? */
1293                 if (!rinfo->head->is_target) {
1294                         dout("fill_trace null dentry\n");
1295                         if (d_really_is_positive(dn)) {
1296                                 ceph_dir_clear_ordered(dir);
1297                                 dout("d_delete %p\n", dn);
1298                                 d_delete(dn);
1299                         } else if (have_lease) {
1300                                 if (d_unhashed(dn))
1301                                         d_add(dn, NULL);
1302                                 update_dentry_lease(dn, rinfo->dlease,
1303                                                     session,
1304                                                     req->r_request_started,
1305                                                     NULL, &dvino);
1306                         }
1307                         goto done;
1308                 }
1309
1310                 /* attach proper inode */
1311                 if (d_really_is_negative(dn)) {
1312                         ceph_dir_clear_ordered(dir);
1313                         ihold(in);
1314                         dn = splice_dentry(dn, in);
1315                         if (IS_ERR(dn)) {
1316                                 err = PTR_ERR(dn);
1317                                 goto done;
1318                         }
1319                         req->r_dentry = dn;  /* may have spliced */
1320                 } else if (d_really_is_positive(dn) && d_inode(dn) != in) {
1321                         dout(" %p links to %p %llx.%llx, not %llx.%llx\n",
1322                              dn, d_inode(dn), ceph_vinop(d_inode(dn)),
1323                              ceph_vinop(in));
1324                         d_invalidate(dn);
1325                         have_lease = false;
1326                 }
1327
1328                 if (have_lease) {
1329                         tvino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1330                         tvino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1331                         update_dentry_lease(dn, rinfo->dlease, session,
1332                                             req->r_request_started,
1333                                             &tvino, &dvino);
1334                 }
1335                 dout(" final dn %p\n", dn);
1336         } else if ((req->r_op == CEPH_MDS_OP_LOOKUPSNAP ||
1337                     req->r_op == CEPH_MDS_OP_MKSNAP) &&
1338                    !test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
1339                 struct dentry *dn = req->r_dentry;
1340                 struct inode *dir = req->r_parent;
1341
1342                 /* fill out a snapdir LOOKUPSNAP dentry */
1343                 BUG_ON(!dn);
1344                 BUG_ON(!dir);
1345                 BUG_ON(ceph_snap(dir) != CEPH_SNAPDIR);
1346                 dout(" linking snapped dir %p to dn %p\n", in, dn);
1347                 ceph_dir_clear_ordered(dir);
1348                 ihold(in);
1349                 dn = splice_dentry(dn, in);
1350                 if (IS_ERR(dn)) {
1351                         err = PTR_ERR(dn);
1352                         goto done;
1353                 }
1354                 req->r_dentry = dn;  /* may have spliced */
1355         } else if (rinfo->head->is_dentry) {
1356                 struct ceph_vino *ptvino = NULL;
1357
1358                 if ((le32_to_cpu(rinfo->diri.in->cap.caps) & CEPH_CAP_FILE_SHARED) ||
1359                     le32_to_cpu(rinfo->dlease->duration_ms)) {
1360                         dvino.ino = le64_to_cpu(rinfo->diri.in->ino);
1361                         dvino.snap = le64_to_cpu(rinfo->diri.in->snapid);
1362
1363                         if (rinfo->head->is_target) {
1364                                 tvino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1365                                 tvino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1366                                 ptvino = &tvino;
1367                         }
1368
1369                         update_dentry_lease(req->r_dentry, rinfo->dlease,
1370                                 session, req->r_request_started, ptvino,
1371                                 &dvino);
1372                 } else {
1373                         dout("%s: no dentry lease or dir cap\n", __func__);
1374                 }
1375         }
1376 done:
1377         dout("fill_trace done err=%d\n", err);
1378         return err;
1379 }
1380
1381 /*
1382  * Prepopulate our cache with readdir results, leases, etc.
1383  */
1384 static int readdir_prepopulate_inodes_only(struct ceph_mds_request *req,
1385                                            struct ceph_mds_session *session)
1386 {
1387         struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1388         int i, err = 0;
1389
1390         for (i = 0; i < rinfo->dir_nr; i++) {
1391                 struct ceph_mds_reply_dir_entry *rde = rinfo->dir_entries + i;
1392                 struct ceph_vino vino;
1393                 struct inode *in;
1394                 int rc;
1395
1396                 vino.ino = le64_to_cpu(rde->inode.in->ino);
1397                 vino.snap = le64_to_cpu(rde->inode.in->snapid);
1398
1399                 in = ceph_get_inode(req->r_dentry->d_sb, vino);
1400                 if (IS_ERR(in)) {
1401                         err = PTR_ERR(in);
1402                         dout("new_inode badness got %d\n", err);
1403                         continue;
1404                 }
1405                 rc = fill_inode(in, NULL, &rde->inode, NULL, session,
1406                                 req->r_request_started, -1,
1407                                 &req->r_caps_reservation);
1408                 if (rc < 0) {
1409                         pr_err("fill_inode badness on %p got %d\n", in, rc);
1410                         err = rc;
1411                 }
1412                 iput(in);
1413         }
1414
1415         return err;
1416 }
1417
1418 void ceph_readdir_cache_release(struct ceph_readdir_cache_control *ctl)
1419 {
1420         if (ctl->page) {
1421                 kunmap(ctl->page);
1422                 put_page(ctl->page);
1423                 ctl->page = NULL;
1424         }
1425 }
1426
1427 static int fill_readdir_cache(struct inode *dir, struct dentry *dn,
1428                               struct ceph_readdir_cache_control *ctl,
1429                               struct ceph_mds_request *req)
1430 {
1431         struct ceph_inode_info *ci = ceph_inode(dir);
1432         unsigned nsize = PAGE_SIZE / sizeof(struct dentry*);
1433         unsigned idx = ctl->index % nsize;
1434         pgoff_t pgoff = ctl->index / nsize;
1435
1436         if (!ctl->page || pgoff != page_index(ctl->page)) {
1437                 ceph_readdir_cache_release(ctl);
1438                 if (idx == 0)
1439                         ctl->page = grab_cache_page(&dir->i_data, pgoff);
1440                 else
1441                         ctl->page = find_lock_page(&dir->i_data, pgoff);
1442                 if (!ctl->page) {
1443                         ctl->index = -1;
1444                         return idx == 0 ? -ENOMEM : 0;
1445                 }
1446                 /* reading/filling the cache are serialized by
1447                  * i_mutex, no need to use page lock */
1448                 unlock_page(ctl->page);
1449                 ctl->dentries = kmap(ctl->page);
1450                 if (idx == 0)
1451                         memset(ctl->dentries, 0, PAGE_SIZE);
1452         }
1453
1454         if (req->r_dir_release_cnt == atomic64_read(&ci->i_release_count) &&
1455             req->r_dir_ordered_cnt == atomic64_read(&ci->i_ordered_count)) {
1456                 dout("readdir cache dn %p idx %d\n", dn, ctl->index);
1457                 ctl->dentries[idx] = dn;
1458                 ctl->index++;
1459         } else {
1460                 dout("disable readdir cache\n");
1461                 ctl->index = -1;
1462         }
1463         return 0;
1464 }
1465
1466 int ceph_readdir_prepopulate(struct ceph_mds_request *req,
1467                              struct ceph_mds_session *session)
1468 {
1469         struct dentry *parent = req->r_dentry;
1470         struct ceph_inode_info *ci = ceph_inode(d_inode(parent));
1471         struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1472         struct qstr dname;
1473         struct dentry *dn;
1474         struct inode *in;
1475         int err = 0, skipped = 0, ret, i;
1476         struct ceph_mds_request_head *rhead = req->r_request->front.iov_base;
1477         u32 frag = le32_to_cpu(rhead->args.readdir.frag);
1478         u32 last_hash = 0;
1479         u32 fpos_offset;
1480         struct ceph_readdir_cache_control cache_ctl = {};
1481
1482         if (test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags))
1483                 return readdir_prepopulate_inodes_only(req, session);
1484
1485         if (rinfo->hash_order) {
1486                 if (req->r_path2) {
1487                         last_hash = ceph_str_hash(ci->i_dir_layout.dl_dir_hash,
1488                                                   req->r_path2,
1489                                                   strlen(req->r_path2));
1490                         last_hash = ceph_frag_value(last_hash);
1491                 } else if (rinfo->offset_hash) {
1492                         /* mds understands offset_hash */
1493                         WARN_ON_ONCE(req->r_readdir_offset != 2);
1494                         last_hash = le32_to_cpu(rhead->args.readdir.offset_hash);
1495                 }
1496         }
1497
1498         if (rinfo->dir_dir &&
1499             le32_to_cpu(rinfo->dir_dir->frag) != frag) {
1500                 dout("readdir_prepopulate got new frag %x -> %x\n",
1501                      frag, le32_to_cpu(rinfo->dir_dir->frag));
1502                 frag = le32_to_cpu(rinfo->dir_dir->frag);
1503                 if (!rinfo->hash_order)
1504                         req->r_readdir_offset = 2;
1505         }
1506
1507         if (le32_to_cpu(rinfo->head->op) == CEPH_MDS_OP_LSSNAP) {
1508                 dout("readdir_prepopulate %d items under SNAPDIR dn %p\n",
1509                      rinfo->dir_nr, parent);
1510         } else {
1511                 dout("readdir_prepopulate %d items under dn %p\n",
1512                      rinfo->dir_nr, parent);
1513                 if (rinfo->dir_dir)
1514                         ceph_fill_dirfrag(d_inode(parent), rinfo->dir_dir);
1515
1516                 if (ceph_frag_is_leftmost(frag) &&
1517                     req->r_readdir_offset == 2 &&
1518                     !(rinfo->hash_order && last_hash)) {
1519                         /* note dir version at start of readdir so we can
1520                          * tell if any dentries get dropped */
1521                         req->r_dir_release_cnt =
1522                                 atomic64_read(&ci->i_release_count);
1523                         req->r_dir_ordered_cnt =
1524                                 atomic64_read(&ci->i_ordered_count);
1525                         req->r_readdir_cache_idx = 0;
1526                 }
1527         }
1528
1529         cache_ctl.index = req->r_readdir_cache_idx;
1530         fpos_offset = req->r_readdir_offset;
1531
1532         /* FIXME: release caps/leases if error occurs */
1533         for (i = 0; i < rinfo->dir_nr; i++) {
1534                 struct ceph_mds_reply_dir_entry *rde = rinfo->dir_entries + i;
1535                 struct ceph_vino tvino, dvino;
1536
1537                 dname.name = rde->name;
1538                 dname.len = rde->name_len;
1539                 dname.hash = full_name_hash(parent, dname.name, dname.len);
1540
1541                 tvino.ino = le64_to_cpu(rde->inode.in->ino);
1542                 tvino.snap = le64_to_cpu(rde->inode.in->snapid);
1543
1544                 if (rinfo->hash_order) {
1545                         u32 hash = ceph_str_hash(ci->i_dir_layout.dl_dir_hash,
1546                                                  rde->name, rde->name_len);
1547                         hash = ceph_frag_value(hash);
1548                         if (hash != last_hash)
1549                                 fpos_offset = 2;
1550                         last_hash = hash;
1551                         rde->offset = ceph_make_fpos(hash, fpos_offset++, true);
1552                 } else {
1553                         rde->offset = ceph_make_fpos(frag, fpos_offset++, false);
1554                 }
1555
1556 retry_lookup:
1557                 dn = d_lookup(parent, &dname);
1558                 dout("d_lookup on parent=%p name=%.*s got %p\n",
1559                      parent, dname.len, dname.name, dn);
1560
1561                 if (!dn) {
1562                         dn = d_alloc(parent, &dname);
1563                         dout("d_alloc %p '%.*s' = %p\n", parent,
1564                              dname.len, dname.name, dn);
1565                         if (!dn) {
1566                                 dout("d_alloc badness\n");
1567                                 err = -ENOMEM;
1568                                 goto out;
1569                         }
1570                 } else if (d_really_is_positive(dn) &&
1571                            (ceph_ino(d_inode(dn)) != tvino.ino ||
1572                             ceph_snap(d_inode(dn)) != tvino.snap)) {
1573                         dout(" dn %p points to wrong inode %p\n",
1574                              dn, d_inode(dn));
1575                         d_delete(dn);
1576                         dput(dn);
1577                         goto retry_lookup;
1578                 }
1579
1580                 /* inode */
1581                 if (d_really_is_positive(dn)) {
1582                         in = d_inode(dn);
1583                 } else {
1584                         in = ceph_get_inode(parent->d_sb, tvino);
1585                         if (IS_ERR(in)) {
1586                                 dout("new_inode badness\n");
1587                                 d_drop(dn);
1588                                 dput(dn);
1589                                 err = PTR_ERR(in);
1590                                 goto out;
1591                         }
1592                 }
1593
1594                 ret = fill_inode(in, NULL, &rde->inode, NULL, session,
1595                                  req->r_request_started, -1,
1596                                  &req->r_caps_reservation);
1597                 if (ret < 0) {
1598                         pr_err("fill_inode badness on %p\n", in);
1599                         if (d_really_is_negative(dn))
1600                                 iput(in);
1601                         d_drop(dn);
1602                         err = ret;
1603                         goto next_item;
1604                 }
1605
1606                 if (d_really_is_negative(dn)) {
1607                         struct dentry *realdn;
1608
1609                         if (ceph_security_xattr_deadlock(in)) {
1610                                 dout(" skip splicing dn %p to inode %p"
1611                                      " (security xattr deadlock)\n", dn, in);
1612                                 iput(in);
1613                                 skipped++;
1614                                 goto next_item;
1615                         }
1616
1617                         realdn = splice_dentry(dn, in);
1618                         if (IS_ERR(realdn)) {
1619                                 err = PTR_ERR(realdn);
1620                                 d_drop(dn);
1621                                 dn = NULL;
1622                                 goto next_item;
1623                         }
1624                         dn = realdn;
1625                 }
1626
1627                 ceph_dentry(dn)->offset = rde->offset;
1628
1629                 dvino = ceph_vino(d_inode(parent));
1630                 update_dentry_lease(dn, rde->lease, req->r_session,
1631                                     req->r_request_started, &tvino, &dvino);
1632
1633                 if (err == 0 && skipped == 0 && cache_ctl.index >= 0) {
1634                         ret = fill_readdir_cache(d_inode(parent), dn,
1635                                                  &cache_ctl, req);
1636                         if (ret < 0)
1637                                 err = ret;
1638                 }
1639 next_item:
1640                 if (dn)
1641                         dput(dn);
1642         }
1643 out:
1644         if (err == 0 && skipped == 0) {
1645                 set_bit(CEPH_MDS_R_DID_PREPOPULATE, &req->r_req_flags);
1646                 req->r_readdir_cache_idx = cache_ctl.index;
1647         }
1648         ceph_readdir_cache_release(&cache_ctl);
1649         dout("readdir_prepopulate done\n");
1650         return err;
1651 }
1652
1653 bool ceph_inode_set_size(struct inode *inode, loff_t size)
1654 {
1655         struct ceph_inode_info *ci = ceph_inode(inode);
1656         bool ret;
1657
1658         spin_lock(&ci->i_ceph_lock);
1659         dout("set_size %p %llu -> %llu\n", inode, inode->i_size, size);
1660         i_size_write(inode, size);
1661         inode->i_blocks = calc_inode_blocks(size);
1662
1663         ret = __ceph_should_report_size(ci);
1664
1665         spin_unlock(&ci->i_ceph_lock);
1666         return ret;
1667 }
1668
1669 /*
1670  * Write back inode data in a worker thread.  (This can't be done
1671  * in the message handler context.)
1672  */
1673 void ceph_queue_writeback(struct inode *inode)
1674 {
1675         ihold(inode);
1676         if (queue_work(ceph_inode_to_client(inode)->wb_wq,
1677                        &ceph_inode(inode)->i_wb_work)) {
1678                 dout("ceph_queue_writeback %p\n", inode);
1679         } else {
1680                 dout("ceph_queue_writeback %p failed\n", inode);
1681                 iput(inode);
1682         }
1683 }
1684
1685 static void ceph_writeback_work(struct work_struct *work)
1686 {
1687         struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1688                                                   i_wb_work);
1689         struct inode *inode = &ci->vfs_inode;
1690
1691         dout("writeback %p\n", inode);
1692         filemap_fdatawrite(&inode->i_data);
1693         iput(inode);
1694 }
1695
1696 /*
1697  * queue an async invalidation
1698  */
1699 void ceph_queue_invalidate(struct inode *inode)
1700 {
1701         ihold(inode);
1702         if (queue_work(ceph_inode_to_client(inode)->pg_inv_wq,
1703                        &ceph_inode(inode)->i_pg_inv_work)) {
1704                 dout("ceph_queue_invalidate %p\n", inode);
1705         } else {
1706                 dout("ceph_queue_invalidate %p failed\n", inode);
1707                 iput(inode);
1708         }
1709 }
1710
1711 /*
1712  * Invalidate inode pages in a worker thread.  (This can't be done
1713  * in the message handler context.)
1714  */
1715 static void ceph_invalidate_work(struct work_struct *work)
1716 {
1717         struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1718                                                   i_pg_inv_work);
1719         struct inode *inode = &ci->vfs_inode;
1720         struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1721         u32 orig_gen;
1722         int check = 0;
1723
1724         mutex_lock(&ci->i_truncate_mutex);
1725
1726         if (READ_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) {
1727                 pr_warn_ratelimited("invalidate_pages %p %lld forced umount\n",
1728                                     inode, ceph_ino(inode));
1729                 mapping_set_error(inode->i_mapping, -EIO);
1730                 truncate_pagecache(inode, 0);
1731                 mutex_unlock(&ci->i_truncate_mutex);
1732                 goto out;
1733         }
1734
1735         spin_lock(&ci->i_ceph_lock);
1736         dout("invalidate_pages %p gen %d revoking %d\n", inode,
1737              ci->i_rdcache_gen, ci->i_rdcache_revoking);
1738         if (ci->i_rdcache_revoking != ci->i_rdcache_gen) {
1739                 if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE))
1740                         check = 1;
1741                 spin_unlock(&ci->i_ceph_lock);
1742                 mutex_unlock(&ci->i_truncate_mutex);
1743                 goto out;
1744         }
1745         orig_gen = ci->i_rdcache_gen;
1746         spin_unlock(&ci->i_ceph_lock);
1747
1748         if (invalidate_inode_pages2(inode->i_mapping) < 0) {
1749                 pr_err("invalidate_pages %p fails\n", inode);
1750         }
1751
1752         spin_lock(&ci->i_ceph_lock);
1753         if (orig_gen == ci->i_rdcache_gen &&
1754             orig_gen == ci->i_rdcache_revoking) {
1755                 dout("invalidate_pages %p gen %d successful\n", inode,
1756                      ci->i_rdcache_gen);
1757                 ci->i_rdcache_revoking--;
1758                 check = 1;
1759         } else {
1760                 dout("invalidate_pages %p gen %d raced, now %d revoking %d\n",
1761                      inode, orig_gen, ci->i_rdcache_gen,
1762                      ci->i_rdcache_revoking);
1763                 if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE))
1764                         check = 1;
1765         }
1766         spin_unlock(&ci->i_ceph_lock);
1767         mutex_unlock(&ci->i_truncate_mutex);
1768 out:
1769         if (check)
1770                 ceph_check_caps(ci, 0, NULL);
1771         iput(inode);
1772 }
1773
1774
1775 /*
1776  * called by trunc_wq;
1777  *
1778  * We also truncate in a separate thread as well.
1779  */
1780 static void ceph_vmtruncate_work(struct work_struct *work)
1781 {
1782         struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1783                                                   i_vmtruncate_work);
1784         struct inode *inode = &ci->vfs_inode;
1785
1786         dout("vmtruncate_work %p\n", inode);
1787         __ceph_do_pending_vmtruncate(inode);
1788         iput(inode);
1789 }
1790
1791 /*
1792  * Queue an async vmtruncate.  If we fail to queue work, we will handle
1793  * the truncation the next time we call __ceph_do_pending_vmtruncate.
1794  */
1795 void ceph_queue_vmtruncate(struct inode *inode)
1796 {
1797         struct ceph_inode_info *ci = ceph_inode(inode);
1798
1799         ihold(inode);
1800
1801         if (queue_work(ceph_sb_to_client(inode->i_sb)->trunc_wq,
1802                        &ci->i_vmtruncate_work)) {
1803                 dout("ceph_queue_vmtruncate %p\n", inode);
1804         } else {
1805                 dout("ceph_queue_vmtruncate %p failed, pending=%d\n",
1806                      inode, ci->i_truncate_pending);
1807                 iput(inode);
1808         }
1809 }
1810
1811 /*
1812  * Make sure any pending truncation is applied before doing anything
1813  * that may depend on it.
1814  */
1815 void __ceph_do_pending_vmtruncate(struct inode *inode)
1816 {
1817         struct ceph_inode_info *ci = ceph_inode(inode);
1818         u64 to;
1819         int wrbuffer_refs, finish = 0;
1820
1821         mutex_lock(&ci->i_truncate_mutex);
1822 retry:
1823         spin_lock(&ci->i_ceph_lock);
1824         if (ci->i_truncate_pending == 0) {
1825                 dout("__do_pending_vmtruncate %p none pending\n", inode);
1826                 spin_unlock(&ci->i_ceph_lock);
1827                 mutex_unlock(&ci->i_truncate_mutex);
1828                 return;
1829         }
1830
1831         /*
1832          * make sure any dirty snapped pages are flushed before we
1833          * possibly truncate them.. so write AND block!
1834          */
1835         if (ci->i_wrbuffer_ref_head < ci->i_wrbuffer_ref) {
1836                 struct ceph_cap_snap *capsnap;
1837                 to = ci->i_truncate_size;
1838                 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
1839                         // MDS should have revoked Frw caps
1840                         WARN_ON_ONCE(capsnap->writing);
1841                         if (capsnap->dirty_pages && capsnap->size > to)
1842                                 to = capsnap->size;
1843                 }
1844                 spin_unlock(&ci->i_ceph_lock);
1845                 dout("__do_pending_vmtruncate %p flushing snaps first\n",
1846                      inode);
1847
1848                 truncate_pagecache(inode, to);
1849
1850                 filemap_write_and_wait_range(&inode->i_data, 0,
1851                                              inode->i_sb->s_maxbytes);
1852                 goto retry;
1853         }
1854
1855         /* there should be no reader or writer */
1856         WARN_ON_ONCE(ci->i_rd_ref || ci->i_wr_ref);
1857
1858         to = ci->i_truncate_size;
1859         wrbuffer_refs = ci->i_wrbuffer_ref;
1860         dout("__do_pending_vmtruncate %p (%d) to %lld\n", inode,
1861              ci->i_truncate_pending, to);
1862         spin_unlock(&ci->i_ceph_lock);
1863
1864         truncate_pagecache(inode, to);
1865
1866         spin_lock(&ci->i_ceph_lock);
1867         if (to == ci->i_truncate_size) {
1868                 ci->i_truncate_pending = 0;
1869                 finish = 1;
1870         }
1871         spin_unlock(&ci->i_ceph_lock);
1872         if (!finish)
1873                 goto retry;
1874
1875         mutex_unlock(&ci->i_truncate_mutex);
1876
1877         if (wrbuffer_refs == 0)
1878                 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
1879
1880         wake_up_all(&ci->i_cap_wq);
1881 }
1882
1883 /*
1884  * symlinks
1885  */
1886 static const struct inode_operations ceph_symlink_iops = {
1887         .get_link = simple_get_link,
1888         .setattr = ceph_setattr,
1889         .getattr = ceph_getattr,
1890         .listxattr = ceph_listxattr,
1891 };
1892
1893 int __ceph_setattr(struct inode *inode, struct iattr *attr)
1894 {
1895         struct ceph_inode_info *ci = ceph_inode(inode);
1896         const unsigned int ia_valid = attr->ia_valid;
1897         struct ceph_mds_request *req;
1898         struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
1899         struct ceph_cap_flush *prealloc_cf;
1900         int issued;
1901         int release = 0, dirtied = 0;
1902         int mask = 0;
1903         int err = 0;
1904         int inode_dirty_flags = 0;
1905         bool lock_snap_rwsem = false;
1906
1907         prealloc_cf = ceph_alloc_cap_flush();
1908         if (!prealloc_cf)
1909                 return -ENOMEM;
1910
1911         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETATTR,
1912                                        USE_AUTH_MDS);
1913         if (IS_ERR(req)) {
1914                 ceph_free_cap_flush(prealloc_cf);
1915                 return PTR_ERR(req);
1916         }
1917
1918         spin_lock(&ci->i_ceph_lock);
1919         issued = __ceph_caps_issued(ci, NULL);
1920
1921         if (!ci->i_head_snapc &&
1922             (issued & (CEPH_CAP_ANY_EXCL | CEPH_CAP_FILE_WR))) {
1923                 lock_snap_rwsem = true;
1924                 if (!down_read_trylock(&mdsc->snap_rwsem)) {
1925                         spin_unlock(&ci->i_ceph_lock);
1926                         down_read(&mdsc->snap_rwsem);
1927                         spin_lock(&ci->i_ceph_lock);
1928                         issued = __ceph_caps_issued(ci, NULL);
1929                 }
1930         }
1931
1932         dout("setattr %p issued %s\n", inode, ceph_cap_string(issued));
1933
1934         if (ia_valid & ATTR_UID) {
1935                 dout("setattr %p uid %d -> %d\n", inode,
1936                      from_kuid(&init_user_ns, inode->i_uid),
1937                      from_kuid(&init_user_ns, attr->ia_uid));
1938                 if (issued & CEPH_CAP_AUTH_EXCL) {
1939                         inode->i_uid = attr->ia_uid;
1940                         dirtied |= CEPH_CAP_AUTH_EXCL;
1941                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1942                            !uid_eq(attr->ia_uid, inode->i_uid)) {
1943                         req->r_args.setattr.uid = cpu_to_le32(
1944                                 from_kuid(&init_user_ns, attr->ia_uid));
1945                         mask |= CEPH_SETATTR_UID;
1946                         release |= CEPH_CAP_AUTH_SHARED;
1947                 }
1948         }
1949         if (ia_valid & ATTR_GID) {
1950                 dout("setattr %p gid %d -> %d\n", inode,
1951                      from_kgid(&init_user_ns, inode->i_gid),
1952                      from_kgid(&init_user_ns, attr->ia_gid));
1953                 if (issued & CEPH_CAP_AUTH_EXCL) {
1954                         inode->i_gid = attr->ia_gid;
1955                         dirtied |= CEPH_CAP_AUTH_EXCL;
1956                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1957                            !gid_eq(attr->ia_gid, inode->i_gid)) {
1958                         req->r_args.setattr.gid = cpu_to_le32(
1959                                 from_kgid(&init_user_ns, attr->ia_gid));
1960                         mask |= CEPH_SETATTR_GID;
1961                         release |= CEPH_CAP_AUTH_SHARED;
1962                 }
1963         }
1964         if (ia_valid & ATTR_MODE) {
1965                 dout("setattr %p mode 0%o -> 0%o\n", inode, inode->i_mode,
1966                      attr->ia_mode);
1967                 if (issued & CEPH_CAP_AUTH_EXCL) {
1968                         inode->i_mode = attr->ia_mode;
1969                         dirtied |= CEPH_CAP_AUTH_EXCL;
1970                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1971                            attr->ia_mode != inode->i_mode) {
1972                         inode->i_mode = attr->ia_mode;
1973                         req->r_args.setattr.mode = cpu_to_le32(attr->ia_mode);
1974                         mask |= CEPH_SETATTR_MODE;
1975                         release |= CEPH_CAP_AUTH_SHARED;
1976                 }
1977         }
1978
1979         if (ia_valid & ATTR_ATIME) {
1980                 dout("setattr %p atime %ld.%ld -> %ld.%ld\n", inode,
1981                      inode->i_atime.tv_sec, inode->i_atime.tv_nsec,
1982                      attr->ia_atime.tv_sec, attr->ia_atime.tv_nsec);
1983                 if (issued & CEPH_CAP_FILE_EXCL) {
1984                         ci->i_time_warp_seq++;
1985                         inode->i_atime = attr->ia_atime;
1986                         dirtied |= CEPH_CAP_FILE_EXCL;
1987                 } else if ((issued & CEPH_CAP_FILE_WR) &&
1988                            timespec_compare(&inode->i_atime,
1989                                             &attr->ia_atime) < 0) {
1990                         inode->i_atime = attr->ia_atime;
1991                         dirtied |= CEPH_CAP_FILE_WR;
1992                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1993                            !timespec_equal(&inode->i_atime, &attr->ia_atime)) {
1994                         ceph_encode_timespec(&req->r_args.setattr.atime,
1995                                              &attr->ia_atime);
1996                         mask |= CEPH_SETATTR_ATIME;
1997                         release |= CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_RD |
1998                                 CEPH_CAP_FILE_WR;
1999                 }
2000         }
2001         if (ia_valid & ATTR_MTIME) {
2002                 dout("setattr %p mtime %ld.%ld -> %ld.%ld\n", inode,
2003                      inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
2004                      attr->ia_mtime.tv_sec, attr->ia_mtime.tv_nsec);
2005                 if (issued & CEPH_CAP_FILE_EXCL) {
2006                         ci->i_time_warp_seq++;
2007                         inode->i_mtime = attr->ia_mtime;
2008                         dirtied |= CEPH_CAP_FILE_EXCL;
2009                 } else if ((issued & CEPH_CAP_FILE_WR) &&
2010                            timespec_compare(&inode->i_mtime,
2011                                             &attr->ia_mtime) < 0) {
2012                         inode->i_mtime = attr->ia_mtime;
2013                         dirtied |= CEPH_CAP_FILE_WR;
2014                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
2015                            !timespec_equal(&inode->i_mtime, &attr->ia_mtime)) {
2016                         ceph_encode_timespec(&req->r_args.setattr.mtime,
2017                                              &attr->ia_mtime);
2018                         mask |= CEPH_SETATTR_MTIME;
2019                         release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD |
2020                                 CEPH_CAP_FILE_WR;
2021                 }
2022         }
2023         if (ia_valid & ATTR_SIZE) {
2024                 dout("setattr %p size %lld -> %lld\n", inode,
2025                      inode->i_size, attr->ia_size);
2026                 if ((issued & CEPH_CAP_FILE_EXCL) &&
2027                     attr->ia_size > inode->i_size) {
2028                         i_size_write(inode, attr->ia_size);
2029                         inode->i_blocks = calc_inode_blocks(attr->ia_size);
2030                         ci->i_reported_size = attr->ia_size;
2031                         dirtied |= CEPH_CAP_FILE_EXCL;
2032                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
2033                            attr->ia_size != inode->i_size) {
2034                         req->r_args.setattr.size = cpu_to_le64(attr->ia_size);
2035                         req->r_args.setattr.old_size =
2036                                 cpu_to_le64(inode->i_size);
2037                         mask |= CEPH_SETATTR_SIZE;
2038                         release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD |
2039                                 CEPH_CAP_FILE_WR;
2040                 }
2041         }
2042
2043         /* these do nothing */
2044         if (ia_valid & ATTR_CTIME) {
2045                 bool only = (ia_valid & (ATTR_SIZE|ATTR_MTIME|ATTR_ATIME|
2046                                          ATTR_MODE|ATTR_UID|ATTR_GID)) == 0;
2047                 dout("setattr %p ctime %ld.%ld -> %ld.%ld (%s)\n", inode,
2048                      inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
2049                      attr->ia_ctime.tv_sec, attr->ia_ctime.tv_nsec,
2050                      only ? "ctime only" : "ignored");
2051                 if (only) {
2052                         /*
2053                          * if kernel wants to dirty ctime but nothing else,
2054                          * we need to choose a cap to dirty under, or do
2055                          * a almost-no-op setattr
2056                          */
2057                         if (issued & CEPH_CAP_AUTH_EXCL)
2058                                 dirtied |= CEPH_CAP_AUTH_EXCL;
2059                         else if (issued & CEPH_CAP_FILE_EXCL)
2060                                 dirtied |= CEPH_CAP_FILE_EXCL;
2061                         else if (issued & CEPH_CAP_XATTR_EXCL)
2062                                 dirtied |= CEPH_CAP_XATTR_EXCL;
2063                         else
2064                                 mask |= CEPH_SETATTR_CTIME;
2065                 }
2066         }
2067         if (ia_valid & ATTR_FILE)
2068                 dout("setattr %p ATTR_FILE ... hrm!\n", inode);
2069
2070         if (dirtied) {
2071                 inode_dirty_flags = __ceph_mark_dirty_caps(ci, dirtied,
2072                                                            &prealloc_cf);
2073                 inode->i_ctime = attr->ia_ctime;
2074         }
2075
2076         release &= issued;
2077         spin_unlock(&ci->i_ceph_lock);
2078         if (lock_snap_rwsem)
2079                 up_read(&mdsc->snap_rwsem);
2080
2081         if (inode_dirty_flags)
2082                 __mark_inode_dirty(inode, inode_dirty_flags);
2083
2084
2085         if (mask) {
2086                 req->r_inode = inode;
2087                 ihold(inode);
2088                 req->r_inode_drop = release;
2089                 req->r_args.setattr.mask = cpu_to_le32(mask);
2090                 req->r_num_caps = 1;
2091                 req->r_stamp = attr->ia_ctime;
2092                 err = ceph_mdsc_do_request(mdsc, NULL, req);
2093         }
2094         dout("setattr %p result=%d (%s locally, %d remote)\n", inode, err,
2095              ceph_cap_string(dirtied), mask);
2096
2097         ceph_mdsc_put_request(req);
2098         ceph_free_cap_flush(prealloc_cf);
2099
2100         if (err >= 0 && (mask & CEPH_SETATTR_SIZE))
2101                 __ceph_do_pending_vmtruncate(inode);
2102
2103         return err;
2104 }
2105
2106 /*
2107  * setattr
2108  */
2109 int ceph_setattr(struct dentry *dentry, struct iattr *attr)
2110 {
2111         struct inode *inode = d_inode(dentry);
2112         int err;
2113
2114         if (ceph_snap(inode) != CEPH_NOSNAP)
2115                 return -EROFS;
2116
2117         err = setattr_prepare(dentry, attr);
2118         if (err != 0)
2119                 return err;
2120
2121         err = __ceph_setattr(inode, attr);
2122
2123         if (err >= 0 && (attr->ia_valid & ATTR_MODE))
2124                 err = posix_acl_chmod(inode, attr->ia_mode);
2125
2126         return err;
2127 }
2128
2129 /*
2130  * Verify that we have a lease on the given mask.  If not,
2131  * do a getattr against an mds.
2132  */
2133 int __ceph_do_getattr(struct inode *inode, struct page *locked_page,
2134                       int mask, bool force)
2135 {
2136         struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
2137         struct ceph_mds_client *mdsc = fsc->mdsc;
2138         struct ceph_mds_request *req;
2139         int err;
2140
2141         if (ceph_snap(inode) == CEPH_SNAPDIR) {
2142                 dout("do_getattr inode %p SNAPDIR\n", inode);
2143                 return 0;
2144         }
2145
2146         dout("do_getattr inode %p mask %s mode 0%o\n",
2147              inode, ceph_cap_string(mask), inode->i_mode);
2148         if (!force && ceph_caps_issued_mask(ceph_inode(inode), mask, 1))
2149                 return 0;
2150
2151         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
2152         if (IS_ERR(req))
2153                 return PTR_ERR(req);
2154         req->r_inode = inode;
2155         ihold(inode);
2156         req->r_num_caps = 1;
2157         req->r_args.getattr.mask = cpu_to_le32(mask);
2158         req->r_locked_page = locked_page;
2159         err = ceph_mdsc_do_request(mdsc, NULL, req);
2160         if (locked_page && err == 0) {
2161                 u64 inline_version = req->r_reply_info.targeti.inline_version;
2162                 if (inline_version == 0) {
2163                         /* the reply is supposed to contain inline data */
2164                         err = -EINVAL;
2165                 } else if (inline_version == CEPH_INLINE_NONE) {
2166                         err = -ENODATA;
2167                 } else {
2168                         err = req->r_reply_info.targeti.inline_len;
2169                 }
2170         }
2171         ceph_mdsc_put_request(req);
2172         dout("do_getattr result=%d\n", err);
2173         return err;
2174 }
2175
2176
2177 /*
2178  * Check inode permissions.  We verify we have a valid value for
2179  * the AUTH cap, then call the generic handler.
2180  */
2181 int ceph_permission(struct inode *inode, int mask)
2182 {
2183         int err;
2184
2185         if (mask & MAY_NOT_BLOCK)
2186                 return -ECHILD;
2187
2188         err = ceph_do_getattr(inode, CEPH_CAP_AUTH_SHARED, false);
2189
2190         if (!err)
2191                 err = generic_permission(inode, mask);
2192         return err;
2193 }
2194
2195 /*
2196  * Get all attributes.  Hopefully somedata we'll have a statlite()
2197  * and can limit the fields we require to be accurate.
2198  */
2199 int ceph_getattr(const struct path *path, struct kstat *stat,
2200                  u32 request_mask, unsigned int flags)
2201 {
2202         struct inode *inode = d_inode(path->dentry);
2203         struct ceph_inode_info *ci = ceph_inode(inode);
2204         int err;
2205
2206         err = ceph_do_getattr(inode, CEPH_STAT_CAP_INODE_ALL, false);
2207         if (!err) {
2208                 generic_fillattr(inode, stat);
2209                 stat->ino = ceph_translate_ino(inode->i_sb, inode->i_ino);
2210                 if (ceph_snap(inode) != CEPH_NOSNAP)
2211                         stat->dev = ceph_snap(inode);
2212                 else
2213                         stat->dev = 0;
2214                 if (S_ISDIR(inode->i_mode)) {
2215                         if (ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb),
2216                                                 RBYTES))
2217                                 stat->size = ci->i_rbytes;
2218                         else
2219                                 stat->size = ci->i_files + ci->i_subdirs;
2220                         stat->blocks = 0;
2221                         stat->blksize = 65536;
2222                 }
2223         }
2224         return err;
2225 }