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