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/posix_acl.h>
  12 #include <linux/random.h>
  13 #include <linux/sort.h>
  14
  15 #include "super.h"
  16 #include "mds_client.h"
  17 #include "cache.h"
  18 #include <linux/ceph/decode.h>
  19
  20 /*
  21  * Ceph inode operations
  22  *
  23  * Implement basic inode helpers (get, alloc) and inode ops (getattr,
  24  * setattr, etc.), xattr helpers, and helpers for assimilating
  25  * metadata returned by the MDS into our cache.
  26  *
  27  * Also define helpers for doing asynchronous writeback, invalidation,
  28  * and truncation for the benefit of those who can't afford to block
  29  * (typically because they are in the message handler path).
  30  */
  31
  32 static const struct inode_operations ceph_symlink_iops;
  33
  34 static void ceph_invalidate_work(struct work_struct *work);
  35 static void ceph_writeback_work(struct work_struct *work);
  36 static void ceph_vmtruncate_work(struct work_struct *work);
  37
  38 /*
  39  * find or create an inode, given the ceph ino number
  40  */
  41 static int ceph_set_ino_cb(struct inode *inode, void *data)
  42 {
  43         ceph_inode(inode)->i_vino = *(struct ceph_vino *)data;
  44         inode->i_ino = ceph_vino_to_ino(*(struct ceph_vino *)data);
  45         return 0;
  46 }
  47
  48 struct inode *ceph_get_inode(struct super_block *sb, struct ceph_vino vino)
  49 {
  50         struct inode *inode;
  51         ino_t t = ceph_vino_to_ino(vino);
  52
  53         inode = iget5_locked(sb, t, ceph_ino_compare, ceph_set_ino_cb, &vino);
  54         if (inode == NULL)
  55                 return ERR_PTR(-ENOMEM);
  56         if (inode->i_state & I_NEW) {
  57                 dout("get_inode created new inode %p %llx.%llx ino %llx\n",
  58                      inode, ceph_vinop(inode), (u64)inode->i_ino);
  59                 unlock_new_inode(inode);
  60         }
  61
  62         dout("get_inode on %lu=%llx.%llx got %p\n", inode->i_ino, vino.ino,
  63              vino.snap, inode);
  64         return inode;
  65 }
  66
  67 /*
  68  * get/constuct snapdir inode for a given directory
  69  */
  70 struct inode *ceph_get_snapdir(struct inode *parent)
  71 {
  72         struct ceph_vino vino = {
  73                 .ino = ceph_ino(parent),
  74                 .snap = CEPH_SNAPDIR,
  75         };
  76         struct inode *inode = ceph_get_inode(parent->i_sb, vino);
  77         struct ceph_inode_info *ci = ceph_inode(inode);
  78
  79         BUG_ON(!S_ISDIR(parent->i_mode));
  80         if (IS_ERR(inode))
  81                 return inode;
  82         inode->i_mode = parent->i_mode;
  83         inode->i_uid = parent->i_uid;
  84         inode->i_gid = parent->i_gid;
  85         inode->i_op = &ceph_snapdir_iops;
  86         inode->i_fop = &ceph_snapdir_fops;
  87         ci->i_snap_caps = CEPH_CAP_PIN; /* so we can open */
  88         ci->i_rbytes = 0;
  89         return inode;
  90 }
  91
  92 const struct inode_operations ceph_file_iops = {
  93         .permission = ceph_permission,
  94         .setattr = ceph_setattr,
  95         .getattr = ceph_getattr,
  96         .setxattr = ceph_setxattr,
  97         .getxattr = ceph_getxattr,
  98         .listxattr = ceph_listxattr,
  99         .removexattr = ceph_removexattr,
 100         .get_acl = ceph_get_acl,
 101         .set_acl = ceph_set_acl,
 102 };
 103
 104
 105 /*
 106  * We use a 'frag tree' to keep track of the MDS's directory fragments
 107  * for a given inode (usually there is just a single fragment).  We
 108  * need to know when a child frag is delegated to a new MDS, or when
 109  * it is flagged as replicated, so we can direct our requests
 110  * accordingly.
 111  */
 112
 113 /*
 114  * find/create a frag in the tree
 115  */
 116 static struct ceph_inode_frag *__get_or_create_frag(struct ceph_inode_info *ci,
 117                                                     u32 f)
 118 {
 119         struct rb_node **p;
 120         struct rb_node *parent = NULL;
 121         struct ceph_inode_frag *frag;
 122         int c;
 123
 124         p = &ci->i_fragtree.rb_node;
 125         while (*p) {
 126                 parent = *p;
 127                 frag = rb_entry(parent, struct ceph_inode_frag, node);
 128                 c = ceph_frag_compare(f, frag->frag);
 129                 if (c < 0)
 130                         p = &(*p)->rb_left;
 131                 else if (c > 0)
 132                         p = &(*p)->rb_right;
 133                 else
 134                         return frag;
 135         }
 136
 137         frag = kmalloc(sizeof(*frag), GFP_NOFS);
 138         if (!frag) {
 139                 pr_err("__get_or_create_frag ENOMEM on %p %llx.%llx "
 140                        "frag %x\n", &ci->vfs_inode,
 141                        ceph_vinop(&ci->vfs_inode), f);
 142                 return ERR_PTR(-ENOMEM);
 143         }
 144         frag->frag = f;
 145         frag->split_by = 0;
 146         frag->mds = -1;
 147         frag->ndist = 0;
 148
 149         rb_link_node(&frag->node, parent, p);
 150         rb_insert_color(&frag->node, &ci->i_fragtree);
 151
 152         dout("get_or_create_frag added %llx.%llx frag %x\n",
 153              ceph_vinop(&ci->vfs_inode), f);
 154         return frag;
 155 }
 156
 157 /*
 158  * find a specific frag @f
 159  */
 160 struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci, u32 f)
 161 {
 162         struct rb_node *n = ci->i_fragtree.rb_node;
 163
 164         while (n) {
 165                 struct ceph_inode_frag *frag =
 166                         rb_entry(n, struct ceph_inode_frag, node);
 167                 int c = ceph_frag_compare(f, frag->frag);
 168                 if (c < 0)
 169                         n = n->rb_left;
 170                 else if (c > 0)
 171                         n = n->rb_right;
 172                 else
 173                         return frag;
 174         }
 175         return NULL;
 176 }
 177
 178 /*
 179  * Choose frag containing the given value @v.  If @pfrag is
 180  * specified, copy the frag delegation info to the caller if
 181  * it is present.
 182  */
 183 static u32 __ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
 184                               struct ceph_inode_frag *pfrag, int *found)
 185 {
 186         u32 t = ceph_frag_make(0, 0);
 187         struct ceph_inode_frag *frag;
 188         unsigned nway, i;
 189         u32 n;
 190
 191         if (found)
 192                 *found = 0;
 193
 194         while (1) {
 195                 WARN_ON(!ceph_frag_contains_value(t, v));
 196                 frag = __ceph_find_frag(ci, t);
 197                 if (!frag)
 198                         break; /* t is a leaf */
 199                 if (frag->split_by == 0) {
 200                         if (pfrag)
 201                                 memcpy(pfrag, frag, sizeof(*pfrag));
 202                         if (found)
 203                                 *found = 1;
 204                         break;
 205                 }
 206
 207                 /* choose child */
 208                 nway = 1 << frag->split_by;
 209                 dout("choose_frag(%x) %x splits by %d (%d ways)\n", v, t,
 210                      frag->split_by, nway);
 211                 for (i = 0; i < nway; i++) {
 212                         n = ceph_frag_make_child(t, frag->split_by, i);
 213                         if (ceph_frag_contains_value(n, v)) {
 214                                 t = n;
 215                                 break;
 216                         }
 217                 }
 218                 BUG_ON(i == nway);
 219         }
 220         dout("choose_frag(%x) = %x\n", v, t);
 221
 222         return t;
 223 }
 224
 225 u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
 226                      struct ceph_inode_frag *pfrag, int *found)
 227 {
 228         u32 ret;
 229         mutex_lock(&ci->i_fragtree_mutex);
 230         ret = __ceph_choose_frag(ci, v, pfrag, found);
 231         mutex_unlock(&ci->i_fragtree_mutex);
 232         return ret;
 233 }
 234
 235 /*
 236  * Process dirfrag (delegation) info from the mds.  Include leaf
 237  * fragment in tree ONLY if ndist > 0.  Otherwise, only
 238  * branches/splits are included in i_fragtree)
 239  */
 240 static int ceph_fill_dirfrag(struct inode *inode,
 241                              struct ceph_mds_reply_dirfrag *dirinfo)
 242 {
 243         struct ceph_inode_info *ci = ceph_inode(inode);
 244         struct ceph_inode_frag *frag;
 245         u32 id = le32_to_cpu(dirinfo->frag);
 246         int mds = le32_to_cpu(dirinfo->auth);
 247         int ndist = le32_to_cpu(dirinfo->ndist);
 248         int diri_auth = -1;
 249         int i;
 250         int err = 0;
 251
 252         spin_lock(&ci->i_ceph_lock);
 253         if (ci->i_auth_cap)
 254                 diri_auth = ci->i_auth_cap->mds;
 255         spin_unlock(&ci->i_ceph_lock);
 256
 257         if (mds == -1) /* CDIR_AUTH_PARENT */
 258                 mds = diri_auth;
 259
 260         mutex_lock(&ci->i_fragtree_mutex);
 261         if (ndist == 0 && mds == diri_auth) {
 262                 /* no delegation info needed. */
 263                 frag = __ceph_find_frag(ci, id);
 264                 if (!frag)
 265                         goto out;
 266                 if (frag->split_by == 0) {
 267                         /* tree leaf, remove */
 268                         dout("fill_dirfrag removed %llx.%llx frag %x"
 269                              " (no ref)\n", ceph_vinop(inode), id);
 270                         rb_erase(&frag->node, &ci->i_fragtree);
 271                         kfree(frag);
 272                 } else {
 273                         /* tree branch, keep and clear */
 274                         dout("fill_dirfrag cleared %llx.%llx frag %x"
 275                              " referral\n", ceph_vinop(inode), id);
 276                         frag->mds = -1;
 277                         frag->ndist = 0;
 278                 }
 279                 goto out;
 280         }
 281
 282
 283         /* find/add this frag to store mds delegation info */
 284         frag = __get_or_create_frag(ci, id);
 285         if (IS_ERR(frag)) {
 286                 /* this is not the end of the world; we can continue
 287                    with bad/inaccurate delegation info */
 288                 pr_err("fill_dirfrag ENOMEM on mds ref %llx.%llx fg %x\n",
 289                        ceph_vinop(inode), le32_to_cpu(dirinfo->frag));
 290                 err = -ENOMEM;
 291                 goto out;
 292         }
 293
 294         frag->mds = mds;
 295         frag->ndist = min_t(u32, ndist, CEPH_MAX_DIRFRAG_REP);
 296         for (i = 0; i < frag->ndist; i++)
 297                 frag->dist[i] = le32_to_cpu(dirinfo->dist[i]);
 298         dout("fill_dirfrag %llx.%llx frag %x ndist=%d\n",
 299              ceph_vinop(inode), frag->frag, frag->ndist);
 300
 301 out:
 302         mutex_unlock(&ci->i_fragtree_mutex);
 303         return err;
 304 }
 305
 306 static int frag_tree_split_cmp(const void *l, const void *r)
 307 {
 308         struct ceph_frag_tree_split *ls = (struct ceph_frag_tree_split*)l;
 309         struct ceph_frag_tree_split *rs = (struct ceph_frag_tree_split*)r;
 310         return ceph_frag_compare(ls->frag, rs->frag);
 311 }
 312
 313 static bool is_frag_child(u32 f, struct ceph_inode_frag *frag)
 314 {
 315         if (!frag)
 316                 return f == ceph_frag_make(0, 0);
 317         if (ceph_frag_bits(f) != ceph_frag_bits(frag->frag) + frag->split_by)
 318                 return false;
 319         return ceph_frag_contains_value(frag->frag, ceph_frag_value(f));
 320 }
 321
 322 static int ceph_fill_fragtree(struct inode *inode,
 323                               struct ceph_frag_tree_head *fragtree,
 324                               struct ceph_mds_reply_dirfrag *dirinfo)
 325 {
 326         struct ceph_inode_info *ci = ceph_inode(inode);
 327         struct ceph_inode_frag *frag, *prev_frag = NULL;
 328         struct rb_node *rb_node;
 329         unsigned i, split_by, nsplits;
 330         u32 id;
 331         bool update = false;
 332
 333         mutex_lock(&ci->i_fragtree_mutex);
 334         nsplits = le32_to_cpu(fragtree->nsplits);
 335         if (nsplits != ci->i_fragtree_nsplits) {
 336                 update = true;
 337         } else if (nsplits) {
 338                 i = prandom_u32() % nsplits;
 339                 id = le32_to_cpu(fragtree->splits[i].frag);
 340                 if (!__ceph_find_frag(ci, id))
 341                         update = true;
 342         } else if (!RB_EMPTY_ROOT(&ci->i_fragtree)) {
 343                 rb_node = rb_first(&ci->i_fragtree);
 344                 frag = rb_entry(rb_node, struct ceph_inode_frag, node);
 345                 if (frag->frag != ceph_frag_make(0, 0) || rb_next(rb_node))
 346                         update = true;
 347         }
 348         if (!update && dirinfo) {
 349                 id = le32_to_cpu(dirinfo->frag);
 350                 if (id != __ceph_choose_frag(ci, id, NULL, NULL))
 351                         update = true;
 352         }
 353         if (!update)
 354                 goto out_unlock;
 355
 356         if (nsplits > 1) {
 357                 sort(fragtree->splits, nsplits, sizeof(fragtree->splits[0]),
 358                      frag_tree_split_cmp, NULL);
 359         }
 360
 361         dout("fill_fragtree %llx.%llx\n", ceph_vinop(inode));
 362         rb_node = rb_first(&ci->i_fragtree);
 363         for (i = 0; i < nsplits; i++) {
 364                 id = le32_to_cpu(fragtree->splits[i].frag);
 365                 split_by = le32_to_cpu(fragtree->splits[i].by);
 366                 if (split_by == 0 || ceph_frag_bits(id) + split_by > 24) {
 367                         pr_err("fill_fragtree %llx.%llx invalid split %d/%u, "
 368                                "frag %x split by %d\n", ceph_vinop(inode),
 369                                i, nsplits, id, split_by);
 370                         continue;
 371                 }
 372                 frag = NULL;
 373                 while (rb_node) {
 374                         frag = rb_entry(rb_node, struct ceph_inode_frag, node);
 375                         if (ceph_frag_compare(frag->frag, id) >= 0) {
 376                                 if (frag->frag != id)
 377                                         frag = NULL;
 378                                 else
 379                                         rb_node = rb_next(rb_node);
 380                                 break;
 381                         }
 382                         rb_node = rb_next(rb_node);
 383                         /* delete stale split/leaf node */
 384                         if (frag->split_by > 0 ||
 385                             !is_frag_child(frag->frag, prev_frag)) {
 386                                 rb_erase(&frag->node, &ci->i_fragtree);
 387                                 if (frag->split_by > 0)
 388                                         ci->i_fragtree_nsplits--;
 389                                 kfree(frag);
 390                         }
 391                         frag = NULL;
 392                 }
 393                 if (!frag) {
 394                         frag = __get_or_create_frag(ci, id);
 395                         if (IS_ERR(frag))
 396                                 continue;
 397                 }
 398                 if (frag->split_by == 0)
 399                         ci->i_fragtree_nsplits++;
 400                 frag->split_by = split_by;
 401                 dout(" frag %x split by %d\n", frag->frag, frag->split_by);
 402                 prev_frag = frag;
 403         }
 404         while (rb_node) {
 405                 frag = rb_entry(rb_node, struct ceph_inode_frag, node);
 406                 rb_node = rb_next(rb_node);
 407                 /* delete stale split/leaf node */
 408                 if (frag->split_by > 0 ||
 409                     !is_frag_child(frag->frag, prev_frag)) {
 410                         rb_erase(&frag->node, &ci->i_fragtree);
 411                         if (frag->split_by > 0)
 412                                 ci->i_fragtree_nsplits--;
 413                         kfree(frag);
 414                 }
 415         }
 416 out_unlock:
 417         mutex_unlock(&ci->i_fragtree_mutex);
 418         return 0;
 419 }
 420
 421 /*
 422  * initialize a newly allocated inode.
 423  */
 424 struct inode *ceph_alloc_inode(struct super_block *sb)
 425 {
 426         struct ceph_inode_info *ci;
 427         int i;
 428
 429         ci = kmem_cache_alloc(ceph_inode_cachep, GFP_NOFS);
 430         if (!ci)
 431                 return NULL;
 432
 433         dout("alloc_inode %p\n", &ci->vfs_inode);
 434
 435         spin_lock_init(&ci->i_ceph_lock);
 436
 437         ci->i_version = 0;
 438         ci->i_inline_version = 0;
 439         ci->i_time_warp_seq = 0;
 440         ci->i_ceph_flags = 0;
 441         atomic64_set(&ci->i_ordered_count, 1);
 442         atomic64_set(&ci->i_release_count, 1);
 443         atomic64_set(&ci->i_complete_seq[0], 0);
 444         atomic64_set(&ci->i_complete_seq[1], 0);
 445         ci->i_symlink = NULL;
 446
 447         memset(&ci->i_dir_layout, 0, sizeof(ci->i_dir_layout));
 448         ci->i_pool_ns_len = 0;
 449
 450         ci->i_fragtree = RB_ROOT;
 451         mutex_init(&ci->i_fragtree_mutex);
 452
 453         ci->i_xattrs.blob = NULL;
 454         ci->i_xattrs.prealloc_blob = NULL;
 455         ci->i_xattrs.dirty = false;
 456         ci->i_xattrs.index = RB_ROOT;
 457         ci->i_xattrs.count = 0;
 458         ci->i_xattrs.names_size = 0;
 459         ci->i_xattrs.vals_size = 0;
 460         ci->i_xattrs.version = 0;
 461         ci->i_xattrs.index_version = 0;
 462
 463         ci->i_caps = RB_ROOT;
 464         ci->i_auth_cap = NULL;
 465         ci->i_dirty_caps = 0;
 466         ci->i_flushing_caps = 0;
 467         INIT_LIST_HEAD(&ci->i_dirty_item);
 468         INIT_LIST_HEAD(&ci->i_flushing_item);
 469         ci->i_prealloc_cap_flush = NULL;
 470         ci->i_cap_flush_tree = RB_ROOT;
 471         init_waitqueue_head(&ci->i_cap_wq);
 472         ci->i_hold_caps_min = 0;
 473         ci->i_hold_caps_max = 0;
 474         INIT_LIST_HEAD(&ci->i_cap_delay_list);
 475         INIT_LIST_HEAD(&ci->i_cap_snaps);
 476         ci->i_head_snapc = NULL;
 477         ci->i_snap_caps = 0;
 478
 479         for (i = 0; i < CEPH_FILE_MODE_NUM; i++)
 480                 ci->i_nr_by_mode[i] = 0;
 481
 482         mutex_init(&ci->i_truncate_mutex);
 483         ci->i_truncate_seq = 0;
 484         ci->i_truncate_size = 0;
 485         ci->i_truncate_pending = 0;
 486
 487         ci->i_max_size = 0;
 488         ci->i_reported_size = 0;
 489         ci->i_wanted_max_size = 0;
 490         ci->i_requested_max_size = 0;
 491
 492         ci->i_pin_ref = 0;
 493         ci->i_rd_ref = 0;
 494         ci->i_rdcache_ref = 0;
 495         ci->i_wr_ref = 0;
 496         ci->i_wb_ref = 0;
 497         ci->i_wrbuffer_ref = 0;
 498         ci->i_wrbuffer_ref_head = 0;
 499         ci->i_shared_gen = 0;
 500         ci->i_rdcache_gen = 0;
 501         ci->i_rdcache_revoking = 0;
 502
 503         INIT_LIST_HEAD(&ci->i_unsafe_writes);
 504         INIT_LIST_HEAD(&ci->i_unsafe_dirops);
 505         INIT_LIST_HEAD(&ci->i_unsafe_iops);
 506         spin_lock_init(&ci->i_unsafe_lock);
 507
 508         ci->i_snap_realm = NULL;
 509         INIT_LIST_HEAD(&ci->i_snap_realm_item);
 510         INIT_LIST_HEAD(&ci->i_snap_flush_item);
 511
 512         INIT_WORK(&ci->i_wb_work, ceph_writeback_work);
 513         INIT_WORK(&ci->i_pg_inv_work, ceph_invalidate_work);
 514
 515         INIT_WORK(&ci->i_vmtruncate_work, ceph_vmtruncate_work);
 516
 517         ceph_fscache_inode_init(ci);
 518
 519         return &ci->vfs_inode;
 520 }
 521
 522 static void ceph_i_callback(struct rcu_head *head)
 523 {
 524         struct inode *inode = container_of(head, struct inode, i_rcu);
 525         struct ceph_inode_info *ci = ceph_inode(inode);
 526
 527         kmem_cache_free(ceph_inode_cachep, ci);
 528 }
 529
 530 void ceph_destroy_inode(struct inode *inode)
 531 {
 532         struct ceph_inode_info *ci = ceph_inode(inode);
 533         struct ceph_inode_frag *frag;
 534         struct rb_node *n;
 535
 536         dout("destroy_inode %p ino %llx.%llx\n", inode, ceph_vinop(inode));
 537
 538         ceph_fscache_unregister_inode_cookie(ci);
 539
 540         ceph_queue_caps_release(inode);
 541
 542         /*
 543          * we may still have a snap_realm reference if there are stray
 544          * caps in i_snap_caps.
 545          */
 546         if (ci->i_snap_realm) {
 547                 struct ceph_mds_client *mdsc =
 548                         ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc;
 549                 struct ceph_snap_realm *realm = ci->i_snap_realm;
 550
 551                 dout(" dropping residual ref to snap realm %p\n", realm);
 552                 spin_lock(&realm->inodes_with_caps_lock);
 553                 list_del_init(&ci->i_snap_realm_item);
 554                 spin_unlock(&realm->inodes_with_caps_lock);
 555                 ceph_put_snap_realm(mdsc, realm);
 556         }
 557
 558         kfree(ci->i_symlink);
 559         while ((n = rb_first(&ci->i_fragtree)) != NULL) {
 560                 frag = rb_entry(n, struct ceph_inode_frag, node);
 561                 rb_erase(n, &ci->i_fragtree);
 562                 kfree(frag);
 563         }
 564         ci->i_fragtree_nsplits = 0;
 565
 566         __ceph_destroy_xattrs(ci);
 567         if (ci->i_xattrs.blob)
 568                 ceph_buffer_put(ci->i_xattrs.blob);
 569         if (ci->i_xattrs.prealloc_blob)
 570                 ceph_buffer_put(ci->i_xattrs.prealloc_blob);
 571
 572         call_rcu(&inode->i_rcu, ceph_i_callback);
 573 }
 574
 575 int ceph_drop_inode(struct inode *inode)
 576 {
 577         /*
 578          * Positve dentry and corresponding inode are always accompanied
 579          * in MDS reply. So no need to keep inode in the cache after
 580          * dropping all its aliases.
 581          */
 582         return 1;
 583 }
 584
 585 static inline blkcnt_t calc_inode_blocks(u64 size)
 586 {
 587         return (size + (1<<9) - 1) >> 9;
 588 }
 589
 590 /*
 591  * Helpers to fill in size, ctime, mtime, and atime.  We have to be
 592  * careful because either the client or MDS may have more up to date
 593  * info, depending on which capabilities are held, and whether
 594  * time_warp_seq or truncate_seq have increased.  (Ordinarily, mtime
 595  * and size are monotonically increasing, except when utimes() or
 596  * truncate() increments the corresponding _seq values.)
 597  */
 598 int ceph_fill_file_size(struct inode *inode, int issued,
 599                         u32 truncate_seq, u64 truncate_size, u64 size)
 600 {
 601         struct ceph_inode_info *ci = ceph_inode(inode);
 602         int queue_trunc = 0;
 603
 604         if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) > 0 ||
 605             (truncate_seq == ci->i_truncate_seq && size > inode->i_size)) {
 606                 dout("size %lld -> %llu\n", inode->i_size, size);
 607                 if (size > 0 && S_ISDIR(inode->i_mode)) {
 608                         pr_err("fill_file_size non-zero size for directory\n");
 609                         size = 0;
 610                 }
 611                 i_size_write(inode, size);
 612                 inode->i_blocks = calc_inode_blocks(size);
 613                 ci->i_reported_size = size;
 614                 if (truncate_seq != ci->i_truncate_seq) {
 615                         dout("truncate_seq %u -> %u\n",
 616                              ci->i_truncate_seq, truncate_seq);
 617                         ci->i_truncate_seq = truncate_seq;
 618
 619                         /* the MDS should have revoked these caps */
 620                         WARN_ON_ONCE(issued & (CEPH_CAP_FILE_EXCL |
 621                                                CEPH_CAP_FILE_RD |
 622                                                CEPH_CAP_FILE_WR |
 623                                                CEPH_CAP_FILE_LAZYIO));
 624                         /*
 625                          * If we hold relevant caps, or in the case where we're
 626                          * not the only client referencing this file and we
 627                          * don't hold those caps, then we need to check whether
 628                          * the file is either opened or mmaped
 629                          */
 630                         if ((issued & (CEPH_CAP_FILE_CACHE|
 631                                        CEPH_CAP_FILE_BUFFER)) ||
 632                             mapping_mapped(inode->i_mapping) ||
 633                             __ceph_caps_file_wanted(ci)) {
 634                                 ci->i_truncate_pending++;
 635                                 queue_trunc = 1;
 636                         }
 637                 }
 638         }
 639         if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) >= 0 &&
 640             ci->i_truncate_size != truncate_size) {
 641                 dout("truncate_size %lld -> %llu\n", ci->i_truncate_size,
 642                      truncate_size);
 643                 ci->i_truncate_size = truncate_size;
 644         }
 645
 646         if (queue_trunc)
 647                 ceph_fscache_invalidate(inode);
 648
 649         return queue_trunc;
 650 }
 651
 652 void ceph_fill_file_time(struct inode *inode, int issued,
 653                          u64 time_warp_seq, struct timespec *ctime,
 654                          struct timespec *mtime, struct timespec *atime)
 655 {
 656         struct ceph_inode_info *ci = ceph_inode(inode);
 657         int warn = 0;
 658
 659         if (issued & (CEPH_CAP_FILE_EXCL|
 660                       CEPH_CAP_FILE_WR|
 661                       CEPH_CAP_FILE_BUFFER|
 662                       CEPH_CAP_AUTH_EXCL|
 663                       CEPH_CAP_XATTR_EXCL)) {
 664                 if (timespec_compare(ctime, &inode->i_ctime) > 0) {
 665                         dout("ctime %ld.%09ld -> %ld.%09ld inc w/ cap\n",
 666                              inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
 667                              ctime->tv_sec, ctime->tv_nsec);
 668                         inode->i_ctime = *ctime;
 669                 }
 670                 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) > 0) {
 671                         /* the MDS did a utimes() */
 672                         dout("mtime %ld.%09ld -> %ld.%09ld "
 673                              "tw %d -> %d\n",
 674                              inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
 675                              mtime->tv_sec, mtime->tv_nsec,
 676                              ci->i_time_warp_seq, (int)time_warp_seq);
 677
 678                         inode->i_mtime = *mtime;
 679                         inode->i_atime = *atime;
 680                         ci->i_time_warp_seq = time_warp_seq;
 681                 } else if (time_warp_seq == ci->i_time_warp_seq) {
 682                         /* nobody did utimes(); take the max */
 683                         if (timespec_compare(mtime, &inode->i_mtime) > 0) {
 684                                 dout("mtime %ld.%09ld -> %ld.%09ld inc\n",
 685                                      inode->i_mtime.tv_sec,
 686                                      inode->i_mtime.tv_nsec,
 687                                      mtime->tv_sec, mtime->tv_nsec);
 688                                 inode->i_mtime = *mtime;
 689                         }
 690                         if (timespec_compare(atime, &inode->i_atime) > 0) {
 691                                 dout("atime %ld.%09ld -> %ld.%09ld inc\n",
 692                                      inode->i_atime.tv_sec,
 693                                      inode->i_atime.tv_nsec,
 694                                      atime->tv_sec, atime->tv_nsec);
 695                                 inode->i_atime = *atime;
 696                         }
 697                 } else if (issued & CEPH_CAP_FILE_EXCL) {
 698                         /* we did a utimes(); ignore mds values */
 699                 } else {
 700                         warn = 1;
 701                 }
 702         } else {
 703                 /* we have no write|excl caps; whatever the MDS says is true */
 704                 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) >= 0) {
 705                         inode->i_ctime = *ctime;
 706                         inode->i_mtime = *mtime;
 707                         inode->i_atime = *atime;
 708                         ci->i_time_warp_seq = time_warp_seq;
 709                 } else {
 710                         warn = 1;
 711                 }
 712         }
 713         if (warn) /* time_warp_seq shouldn't go backwards */
 714                 dout("%p mds time_warp_seq %llu < %u\n",
 715                      inode, time_warp_seq, ci->i_time_warp_seq);
 716 }
 717
 718 /*
 719  * Populate an inode based on info from mds.  May be called on new or
 720  * existing inodes.
 721  */
 722 static int fill_inode(struct inode *inode, struct page *locked_page,
 723                       struct ceph_mds_reply_info_in *iinfo,
 724                       struct ceph_mds_reply_dirfrag *dirinfo,
 725                       struct ceph_mds_session *session,
 726                       unsigned long ttl_from, int cap_fmode,
 727                       struct ceph_cap_reservation *caps_reservation)
 728 {
 729         struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
 730         struct ceph_mds_reply_inode *info = iinfo->in;
 731         struct ceph_inode_info *ci = ceph_inode(inode);
 732         int issued = 0, implemented, new_issued;
 733         struct timespec mtime, atime, ctime;
 734         struct ceph_buffer *xattr_blob = NULL;
 735         struct ceph_cap *new_cap = NULL;
 736         int err = 0;
 737         bool wake = false;
 738         bool queue_trunc = false;
 739         bool new_version = false;
 740         bool fill_inline = false;
 741
 742         dout("fill_inode %p ino %llx.%llx v %llu had %llu\n",
 743              inode, ceph_vinop(inode), le64_to_cpu(info->version),
 744              ci->i_version);
 745
 746         /* prealloc new cap struct */
 747         if (info->cap.caps && ceph_snap(inode) == CEPH_NOSNAP)
 748                 new_cap = ceph_get_cap(mdsc, caps_reservation);
 749
 750         /*
 751          * prealloc xattr data, if it looks like we'll need it.  only
 752          * if len > 4 (meaning there are actually xattrs; the first 4
 753          * bytes are the xattr count).
 754          */
 755         if (iinfo->xattr_len > 4) {
 756                 xattr_blob = ceph_buffer_new(iinfo->xattr_len, GFP_NOFS);
 757                 if (!xattr_blob)
 758                         pr_err("fill_inode ENOMEM xattr blob %d bytes\n",
 759                                iinfo->xattr_len);
 760         }
 761
 762         spin_lock(&ci->i_ceph_lock);
 763
 764         /*
 765          * provided version will be odd if inode value is projected,
 766          * even if stable.  skip the update if we have newer stable
 767          * info (ours>=theirs, e.g. due to racing mds replies), unless
 768          * we are getting projected (unstable) info (in which case the
 769          * version is odd, and we want ours>theirs).
 770          *   us   them
 771          *   2    2     skip
 772          *   3    2     skip
 773          *   3    3     update
 774          */
 775         if (ci->i_version == 0 ||
 776             ((info->cap.flags & CEPH_CAP_FLAG_AUTH) &&
 777              le64_to_cpu(info->version) > (ci->i_version & ~1)))
 778                 new_version = true;
 779
 780         issued = __ceph_caps_issued(ci, &implemented);
 781         issued |= implemented | __ceph_caps_dirty(ci);
 782         new_issued = ~issued & le32_to_cpu(info->cap.caps);
 783
 784         /* update inode */
 785         ci->i_version = le64_to_cpu(info->version);
 786         inode->i_version++;
 787         inode->i_rdev = le32_to_cpu(info->rdev);
 788         inode->i_blkbits = fls(le32_to_cpu(info->layout.fl_stripe_unit)) - 1;
 789
 790         if ((new_version || (new_issued & CEPH_CAP_AUTH_SHARED)) &&
 791             (issued & CEPH_CAP_AUTH_EXCL) == 0) {
 792                 inode->i_mode = le32_to_cpu(info->mode);
 793                 inode->i_uid = make_kuid(&init_user_ns, le32_to_cpu(info->uid));
 794                 inode->i_gid = make_kgid(&init_user_ns, le32_to_cpu(info->gid));
 795                 dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode,
 796                      from_kuid(&init_user_ns, inode->i_uid),
 797                      from_kgid(&init_user_ns, inode->i_gid));
 798         }
 799
 800         if ((new_version || (new_issued & CEPH_CAP_LINK_SHARED)) &&
 801             (issued & CEPH_CAP_LINK_EXCL) == 0)
 802                 set_nlink(inode, le32_to_cpu(info->nlink));
 803
 804         if (new_version || (new_issued & CEPH_CAP_ANY_RD)) {
 805                 /* be careful with mtime, atime, size */
 806                 ceph_decode_timespec(&atime, &info->atime);
 807                 ceph_decode_timespec(&mtime, &info->mtime);
 808                 ceph_decode_timespec(&ctime, &info->ctime);
 809                 ceph_fill_file_time(inode, issued,
 810                                 le32_to_cpu(info->time_warp_seq),
 811                                 &ctime, &mtime, &atime);
 812         }
 813
 814         if (new_version ||
 815             (new_issued & (CEPH_CAP_ANY_FILE_RD | CEPH_CAP_ANY_FILE_WR))) {
 816                 if (ci->i_layout.fl_pg_pool != info->layout.fl_pg_pool)
 817                         ci->i_ceph_flags &= ~CEPH_I_POOL_PERM;
 818                 ci->i_layout = info->layout;
 819                 ci->i_pool_ns_len = iinfo->pool_ns_len;
 820
 821                 queue_trunc = ceph_fill_file_size(inode, issued,
 822                                         le32_to_cpu(info->truncate_seq),
 823                                         le64_to_cpu(info->truncate_size),
 824                                         le64_to_cpu(info->size));
 825                 /* only update max_size on auth cap */
 826                 if ((info->cap.flags & CEPH_CAP_FLAG_AUTH) &&
 827                     ci->i_max_size != le64_to_cpu(info->max_size)) {
 828                         dout("max_size %lld -> %llu\n", ci->i_max_size,
 829                                         le64_to_cpu(info->max_size));
 830                         ci->i_max_size = le64_to_cpu(info->max_size);
 831                 }
 832         }
 833
 834         /* xattrs */
 835         /* note that if i_xattrs.len <= 4, i_xattrs.data will still be NULL. */
 836         if ((ci->i_xattrs.version == 0 || !(issued & CEPH_CAP_XATTR_EXCL))  &&
 837             le64_to_cpu(info->xattr_version) > ci->i_xattrs.version) {
 838                 if (ci->i_xattrs.blob)
 839                         ceph_buffer_put(ci->i_xattrs.blob);
 840                 ci->i_xattrs.blob = xattr_blob;
 841                 if (xattr_blob)
 842                         memcpy(ci->i_xattrs.blob->vec.iov_base,
 843                                iinfo->xattr_data, iinfo->xattr_len);
 844                 ci->i_xattrs.version = le64_to_cpu(info->xattr_version);
 845                 ceph_forget_all_cached_acls(inode);
 846                 xattr_blob = NULL;
 847         }
 848
 849         inode->i_mapping->a_ops = &ceph_aops;
 850
 851         switch (inode->i_mode & S_IFMT) {
 852         case S_IFIFO:
 853         case S_IFBLK:
 854         case S_IFCHR:
 855         case S_IFSOCK:
 856                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
 857                 inode->i_op = &ceph_file_iops;
 858                 break;
 859         case S_IFREG:
 860                 inode->i_op = &ceph_file_iops;
 861                 inode->i_fop = &ceph_file_fops;
 862                 break;
 863         case S_IFLNK:
 864                 inode->i_op = &ceph_symlink_iops;
 865                 if (!ci->i_symlink) {
 866                         u32 symlen = iinfo->symlink_len;
 867                         char *sym;
 868
 869                         spin_unlock(&ci->i_ceph_lock);
 870
 871                         if (symlen != i_size_read(inode)) {
 872                                 pr_err("fill_inode %llx.%llx BAD symlink "
 873                                         "size %lld\n", ceph_vinop(inode),
 874                                         i_size_read(inode));
 875                                 i_size_write(inode, symlen);
 876                                 inode->i_blocks = calc_inode_blocks(symlen);
 877                         }
 878
 879                         err = -ENOMEM;
 880                         sym = kstrndup(iinfo->symlink, symlen, GFP_NOFS);
 881                         if (!sym)
 882                                 goto out;
 883
 884                         spin_lock(&ci->i_ceph_lock);
 885                         if (!ci->i_symlink)
 886                                 ci->i_symlink = sym;
 887                         else
 888                                 kfree(sym); /* lost a race */
 889                 }
 890                 inode->i_link = ci->i_symlink;
 891                 break;
 892         case S_IFDIR:
 893                 inode->i_op = &ceph_dir_iops;
 894                 inode->i_fop = &ceph_dir_fops;
 895
 896                 ci->i_dir_layout = iinfo->dir_layout;
 897
 898                 ci->i_files = le64_to_cpu(info->files);
 899                 ci->i_subdirs = le64_to_cpu(info->subdirs);
 900                 ci->i_rbytes = le64_to_cpu(info->rbytes);
 901                 ci->i_rfiles = le64_to_cpu(info->rfiles);
 902                 ci->i_rsubdirs = le64_to_cpu(info->rsubdirs);
 903                 ceph_decode_timespec(&ci->i_rctime, &info->rctime);
 904                 break;
 905         default:
 906                 pr_err("fill_inode %llx.%llx BAD mode 0%o\n",
 907                        ceph_vinop(inode), inode->i_mode);
 908         }
 909
 910         /* were we issued a capability? */
 911         if (info->cap.caps) {
 912                 if (ceph_snap(inode) == CEPH_NOSNAP) {
 913                         unsigned caps = le32_to_cpu(info->cap.caps);
 914                         ceph_add_cap(inode, session,
 915                                      le64_to_cpu(info->cap.cap_id),
 916                                      cap_fmode, caps,
 917                                      le32_to_cpu(info->cap.wanted),
 918                                      le32_to_cpu(info->cap.seq),
 919                                      le32_to_cpu(info->cap.mseq),
 920                                      le64_to_cpu(info->cap.realm),
 921                                      info->cap.flags, &new_cap);
 922
 923                         /* set dir completion flag? */
 924                         if (S_ISDIR(inode->i_mode) &&
 925                             ci->i_files == 0 && ci->i_subdirs == 0 &&
 926                             (caps & CEPH_CAP_FILE_SHARED) &&
 927                             (issued & CEPH_CAP_FILE_EXCL) == 0 &&
 928                             !__ceph_dir_is_complete(ci)) {
 929                                 dout(" marking %p complete (empty)\n", inode);
 930                                 i_size_write(inode, 0);
 931                                 __ceph_dir_set_complete(ci,
 932                                         atomic64_read(&ci->i_release_count),
 933                                         atomic64_read(&ci->i_ordered_count));
 934                         }
 935
 936                         wake = true;
 937                 } else {
 938                         dout(" %p got snap_caps %s\n", inode,
 939                              ceph_cap_string(le32_to_cpu(info->cap.caps)));
 940                         ci->i_snap_caps |= le32_to_cpu(info->cap.caps);
 941                         if (cap_fmode >= 0)
 942                                 __ceph_get_fmode(ci, cap_fmode);
 943                 }
 944         } else if (cap_fmode >= 0) {
 945                 pr_warn("mds issued no caps on %llx.%llx\n",
 946                            ceph_vinop(inode));
 947                 __ceph_get_fmode(ci, cap_fmode);
 948         }
 949
 950         if (iinfo->inline_version > 0 &&
 951             iinfo->inline_version >= ci->i_inline_version) {
 952                 int cache_caps = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO;
 953                 ci->i_inline_version = iinfo->inline_version;
 954                 if (ci->i_inline_version != CEPH_INLINE_NONE &&
 955                     (locked_page ||
 956                      (le32_to_cpu(info->cap.caps) & cache_caps)))
 957                         fill_inline = true;
 958         }
 959
 960         spin_unlock(&ci->i_ceph_lock);
 961
 962         if (fill_inline)
 963                 ceph_fill_inline_data(inode, locked_page,
 964                                       iinfo->inline_data, iinfo->inline_len);
 965
 966         if (wake)
 967                 wake_up_all(&ci->i_cap_wq);
 968
 969         /* queue truncate if we saw i_size decrease */
 970         if (queue_trunc)
 971                 ceph_queue_vmtruncate(inode);
 972
 973         /* populate frag tree */
 974         if (S_ISDIR(inode->i_mode))
 975                 ceph_fill_fragtree(inode, &info->fragtree, dirinfo);
 976
 977         /* update delegation info? */
 978         if (dirinfo)
 979                 ceph_fill_dirfrag(inode, dirinfo);
 980
 981         err = 0;
 982 out:
 983         if (new_cap)
 984                 ceph_put_cap(mdsc, new_cap);
 985         if (xattr_blob)
 986                 ceph_buffer_put(xattr_blob);
 987         return err;
 988 }
 989
 990 /*
 991  * caller should hold session s_mutex.
 992  */
 993 static void update_dentry_lease(struct dentry *dentry,
 994                                 struct ceph_mds_reply_lease *lease,
 995                                 struct ceph_mds_session *session,
 996                                 unsigned long from_time)
 997 {
 998         struct ceph_dentry_info *di = ceph_dentry(dentry);
 999         long unsigned duration = le32_to_cpu(lease->duration_ms);
1000         long unsigned ttl = from_time + (duration * HZ) / 1000;
1001         long unsigned half_ttl = from_time + (duration * HZ / 2) / 1000;
1002         struct inode *dir;
1003
1004         /* only track leases on regular dentries */
1005         if (dentry->d_op != &ceph_dentry_ops)
1006                 return;
1007
1008         spin_lock(&dentry->d_lock);
1009         dout("update_dentry_lease %p duration %lu ms ttl %lu\n",
1010              dentry, duration, ttl);
1011
1012         /* make lease_rdcache_gen match directory */
1013         dir = d_inode(dentry->d_parent);
1014         di->lease_shared_gen = ceph_inode(dir)->i_shared_gen;
1015
1016         if (duration == 0)
1017                 goto out_unlock;
1018
1019         if (di->lease_gen == session->s_cap_gen &&
1020             time_before(ttl, dentry->d_time))
1021                 goto out_unlock;  /* we already have a newer lease. */
1022
1023         if (di->lease_session && di->lease_session != session)
1024                 goto out_unlock;
1025
1026         ceph_dentry_lru_touch(dentry);
1027
1028         if (!di->lease_session)
1029                 di->lease_session = ceph_get_mds_session(session);
1030         di->lease_gen = session->s_cap_gen;
1031         di->lease_seq = le32_to_cpu(lease->seq);
1032         di->lease_renew_after = half_ttl;
1033         di->lease_renew_from = 0;
1034         dentry->d_time = ttl;
1035 out_unlock:
1036         spin_unlock(&dentry->d_lock);
1037         return;
1038 }
1039
1040 /*
1041  * splice a dentry to an inode.
1042  * caller must hold directory i_mutex for this to be safe.
1043  */
1044 static struct dentry *splice_dentry(struct dentry *dn, struct inode *in)
1045 {
1046         struct dentry *realdn;
1047
1048         BUG_ON(d_inode(dn));
1049
1050         /* dn must be unhashed */
1051         if (!d_unhashed(dn))
1052                 d_drop(dn);
1053         realdn = d_splice_alias(in, dn);
1054         if (IS_ERR(realdn)) {
1055                 pr_err("splice_dentry error %ld %p inode %p ino %llx.%llx\n",
1056                        PTR_ERR(realdn), dn, in, ceph_vinop(in));
1057                 dn = realdn; /* note realdn contains the error */
1058                 goto out;
1059         } else if (realdn) {
1060                 dout("dn %p (%d) spliced with %p (%d) "
1061                      "inode %p ino %llx.%llx\n",
1062                      dn, d_count(dn),
1063                      realdn, d_count(realdn),
1064                      d_inode(realdn), ceph_vinop(d_inode(realdn)));
1065                 dput(dn);
1066                 dn = realdn;
1067         } else {
1068                 BUG_ON(!ceph_dentry(dn));
1069                 dout("dn %p attached to %p ino %llx.%llx\n",
1070                      dn, d_inode(dn), ceph_vinop(d_inode(dn)));
1071         }
1072 out:
1073         return dn;
1074 }
1075
1076 /*
1077  * Incorporate results into the local cache.  This is either just
1078  * one inode, or a directory, dentry, and possibly linked-to inode (e.g.,
1079  * after a lookup).
1080  *
1081  * A reply may contain
1082  *         a directory inode along with a dentry.
1083  *  and/or a target inode
1084  *
1085  * Called with snap_rwsem (read).
1086  */
1087 int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req,
1088                     struct ceph_mds_session *session)
1089 {
1090         struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1091         struct inode *in = NULL;
1092         struct ceph_vino vino;
1093         struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
1094         int err = 0;
1095
1096         dout("fill_trace %p is_dentry %d is_target %d\n", req,
1097              rinfo->head->is_dentry, rinfo->head->is_target);
1098
1099 #if 0
1100         /*
1101          * Debugging hook:
1102          *
1103          * If we resend completed ops to a recovering mds, we get no
1104          * trace.  Since that is very rare, pretend this is the case
1105          * to ensure the 'no trace' handlers in the callers behave.
1106          *
1107          * Fill in inodes unconditionally to avoid breaking cap
1108          * invariants.
1109          */
1110         if (rinfo->head->op & CEPH_MDS_OP_WRITE) {
1111                 pr_info("fill_trace faking empty trace on %lld %s\n",
1112                         req->r_tid, ceph_mds_op_name(rinfo->head->op));
1113                 if (rinfo->head->is_dentry) {
1114                         rinfo->head->is_dentry = 0;
1115                         err = fill_inode(req->r_locked_dir,
1116                                          &rinfo->diri, rinfo->dirfrag,
1117                                          session, req->r_request_started, -1);
1118                 }
1119                 if (rinfo->head->is_target) {
1120                         rinfo->head->is_target = 0;
1121                         ininfo = rinfo->targeti.in;
1122                         vino.ino = le64_to_cpu(ininfo->ino);
1123                         vino.snap = le64_to_cpu(ininfo->snapid);
1124                         in = ceph_get_inode(sb, vino);
1125                         err = fill_inode(in, &rinfo->targeti, NULL,
1126                                          session, req->r_request_started,
1127                                          req->r_fmode);
1128                         iput(in);
1129                 }
1130         }
1131 #endif
1132
1133         if (!rinfo->head->is_target && !rinfo->head->is_dentry) {
1134                 dout("fill_trace reply is empty!\n");
1135                 if (rinfo->head->result == 0 && req->r_locked_dir)
1136                         ceph_invalidate_dir_request(req);
1137                 return 0;
1138         }
1139
1140         if (rinfo->head->is_dentry) {
1141                 struct inode *dir = req->r_locked_dir;
1142
1143                 if (dir) {
1144                         err = fill_inode(dir, NULL,
1145                                          &rinfo->diri, rinfo->dirfrag,
1146                                          session, req->r_request_started, -1,
1147                                          &req->r_caps_reservation);
1148                         if (err < 0)
1149                                 goto done;
1150                 } else {
1151                         WARN_ON_ONCE(1);
1152                 }
1153
1154                 if (dir && req->r_op == CEPH_MDS_OP_LOOKUPNAME) {
1155                         struct qstr dname;
1156                         struct dentry *dn, *parent;
1157
1158                         BUG_ON(!rinfo->head->is_target);
1159                         BUG_ON(req->r_dentry);
1160
1161                         parent = d_find_any_alias(dir);
1162                         BUG_ON(!parent);
1163
1164                         dname.name = rinfo->dname;
1165                         dname.len = rinfo->dname_len;
1166                         dname.hash = full_name_hash(dname.name, dname.len);
1167                         vino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1168                         vino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1169 retry_lookup:
1170                         dn = d_lookup(parent, &dname);
1171                         dout("d_lookup on parent=%p name=%.*s got %p\n",
1172                              parent, dname.len, dname.name, dn);
1173
1174                         if (!dn) {
1175                                 dn = d_alloc(parent, &dname);
1176                                 dout("d_alloc %p '%.*s' = %p\n", parent,
1177                                      dname.len, dname.name, dn);
1178                                 if (dn == NULL) {
1179                                         dput(parent);
1180                                         err = -ENOMEM;
1181                                         goto done;
1182                                 }
1183                                 err = ceph_init_dentry(dn);
1184                                 if (err < 0) {
1185                                         dput(dn);
1186                                         dput(parent);
1187                                         goto done;
1188                                 }
1189                         } else if (d_really_is_positive(dn) &&
1190                                    (ceph_ino(d_inode(dn)) != vino.ino ||
1191                                     ceph_snap(d_inode(dn)) != vino.snap)) {
1192                                 dout(" dn %p points to wrong inode %p\n",
1193                                      dn, d_inode(dn));
1194                                 d_delete(dn);
1195                                 dput(dn);
1196                                 goto retry_lookup;
1197                         }
1198
1199                         req->r_dentry = dn;
1200                         dput(parent);
1201                 }
1202         }
1203
1204         if (rinfo->head->is_target) {
1205                 vino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1206                 vino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1207
1208                 in = ceph_get_inode(sb, vino);
1209                 if (IS_ERR(in)) {
1210                         err = PTR_ERR(in);
1211                         goto done;
1212                 }
1213                 req->r_target_inode = in;
1214
1215                 err = fill_inode(in, req->r_locked_page, &rinfo->targeti, NULL,
1216                                 session, req->r_request_started,
1217                                 (!req->r_aborted && rinfo->head->result == 0) ?
1218                                 req->r_fmode : -1,
1219                                 &req->r_caps_reservation);
1220                 if (err < 0) {
1221                         pr_err("fill_inode badness %p %llx.%llx\n",
1222                                 in, ceph_vinop(in));
1223                         goto done;
1224                 }
1225         }
1226
1227         /*
1228          * ignore null lease/binding on snapdir ENOENT, or else we
1229          * will have trouble splicing in the virtual snapdir later
1230          */
1231         if (rinfo->head->is_dentry && !req->r_aborted &&
1232             req->r_locked_dir &&
1233             (rinfo->head->is_target || strncmp(req->r_dentry->d_name.name,
1234                                                fsc->mount_options->snapdir_name,
1235                                                req->r_dentry->d_name.len))) {
1236                 /*
1237                  * lookup link rename   : null -> possibly existing inode
1238                  * mknod symlink mkdir  : null -> new inode
1239                  * unlink               : linked -> null
1240                  */
1241                 struct inode *dir = req->r_locked_dir;
1242                 struct dentry *dn = req->r_dentry;
1243                 bool have_dir_cap, have_lease;
1244
1245                 BUG_ON(!dn);
1246                 BUG_ON(!dir);
1247                 BUG_ON(d_inode(dn->d_parent) != dir);
1248                 BUG_ON(ceph_ino(dir) !=
1249                        le64_to_cpu(rinfo->diri.in->ino));
1250                 BUG_ON(ceph_snap(dir) !=
1251                        le64_to_cpu(rinfo->diri.in->snapid));
1252
1253                 /* do we have a lease on the whole dir? */
1254                 have_dir_cap =
1255                         (le32_to_cpu(rinfo->diri.in->cap.caps) &
1256                          CEPH_CAP_FILE_SHARED);
1257
1258                 /* do we have a dn lease? */
1259                 have_lease = have_dir_cap ||
1260                         le32_to_cpu(rinfo->dlease->duration_ms);
1261                 if (!have_lease)
1262                         dout("fill_trace  no dentry lease or dir cap\n");
1263
1264                 /* rename? */
1265                 if (req->r_old_dentry && req->r_op == CEPH_MDS_OP_RENAME) {
1266                         struct inode *olddir = req->r_old_dentry_dir;
1267                         BUG_ON(!olddir);
1268
1269                         dout(" src %p '%pd' dst %p '%pd'\n",
1270                              req->r_old_dentry,
1271                              req->r_old_dentry,
1272                              dn, dn);
1273                         dout("fill_trace doing d_move %p -> %p\n",
1274                              req->r_old_dentry, dn);
1275
1276                         /* d_move screws up sibling dentries' offsets */
1277                         ceph_dir_clear_ordered(dir);
1278                         ceph_dir_clear_ordered(olddir);
1279
1280                         d_move(req->r_old_dentry, dn);
1281                         dout(" src %p '%pd' dst %p '%pd'\n",
1282                              req->r_old_dentry,
1283                              req->r_old_dentry,
1284                              dn, dn);
1285
1286                         /* ensure target dentry is invalidated, despite
1287                            rehashing bug in vfs_rename_dir */
1288                         ceph_invalidate_dentry_lease(dn);
1289
1290                         dout("dn %p gets new offset %lld\n", req->r_old_dentry,
1291                              ceph_dentry(req->r_old_dentry)->offset);
1292
1293                         dn = req->r_old_dentry;  /* use old_dentry */
1294                 }
1295
1296                 /* null dentry? */
1297                 if (!rinfo->head->is_target) {
1298                         dout("fill_trace null dentry\n");
1299                         if (d_really_is_positive(dn)) {
1300                                 ceph_dir_clear_ordered(dir);
1301                                 dout("d_delete %p\n", dn);
1302                                 d_delete(dn);
1303                         } else {
1304                                 if (have_lease && d_unhashed(dn))
1305                                         d_add(dn, NULL);
1306                                 update_dentry_lease(dn, rinfo->dlease,
1307                                                     session,
1308                                                     req->r_request_started);
1309                         }
1310                         goto done;
1311                 }
1312
1313                 /* attach proper inode */
1314                 if (d_really_is_negative(dn)) {
1315                         ceph_dir_clear_ordered(dir);
1316                         ihold(in);
1317                         dn = splice_dentry(dn, in);
1318                         if (IS_ERR(dn)) {
1319                                 err = PTR_ERR(dn);
1320                                 goto done;
1321                         }
1322                         req->r_dentry = dn;  /* may have spliced */
1323                 } else if (d_really_is_positive(dn) && d_inode(dn) != in) {
1324                         dout(" %p links to %p %llx.%llx, not %llx.%llx\n",
1325                              dn, d_inode(dn), ceph_vinop(d_inode(dn)),
1326                              ceph_vinop(in));
1327                         d_invalidate(dn);
1328                         have_lease = false;
1329                 }
1330
1331                 if (have_lease)
1332                         update_dentry_lease(dn, rinfo->dlease, session,
1333                                             req->r_request_started);
1334                 dout(" final dn %p\n", dn);
1335         } else if (!req->r_aborted &&
1336                    (req->r_op == CEPH_MDS_OP_LOOKUPSNAP ||
1337                     req->r_op == CEPH_MDS_OP_MKSNAP)) {
1338                 struct dentry *dn = req->r_dentry;
1339                 struct inode *dir = req->r_locked_dir;
1340
1341                 /* fill out a snapdir LOOKUPSNAP dentry */
1342                 BUG_ON(!dn);
1343                 BUG_ON(!dir);
1344                 BUG_ON(ceph_snap(dir) != CEPH_SNAPDIR);
1345                 dout(" linking snapped dir %p to dn %p\n", in, dn);
1346                 ceph_dir_clear_ordered(dir);
1347                 ihold(in);
1348                 dn = splice_dentry(dn, in);
1349                 if (IS_ERR(dn)) {
1350                         err = PTR_ERR(dn);
1351                         goto done;
1352                 }
1353                 req->r_dentry = dn;  /* may have spliced */
1354         }
1355 done:
1356         dout("fill_trace done err=%d\n", err);
1357         return err;
1358 }
1359
1360 /*
1361  * Prepopulate our cache with readdir results, leases, etc.
1362  */
1363 static int readdir_prepopulate_inodes_only(struct ceph_mds_request *req,
1364                                            struct ceph_mds_session *session)
1365 {
1366         struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1367         int i, err = 0;
1368
1369         for (i = 0; i < rinfo->dir_nr; i++) {
1370                 struct ceph_mds_reply_dir_entry *rde = rinfo->dir_entries + i;
1371                 struct ceph_vino vino;
1372                 struct inode *in;
1373                 int rc;
1374
1375                 vino.ino = le64_to_cpu(rde->inode.in->ino);
1376                 vino.snap = le64_to_cpu(rde->inode.in->snapid);
1377
1378                 in = ceph_get_inode(req->r_dentry->d_sb, vino);
1379                 if (IS_ERR(in)) {
1380                         err = PTR_ERR(in);
1381                         dout("new_inode badness got %d\n", err);
1382                         continue;
1383                 }
1384                 rc = fill_inode(in, NULL, &rde->inode, NULL, session,
1385                                 req->r_request_started, -1,
1386                                 &req->r_caps_reservation);
1387                 if (rc < 0) {
1388                         pr_err("fill_inode badness on %p got %d\n", in, rc);
1389                         err = rc;
1390                 }
1391                 iput(in);
1392         }
1393
1394         return err;
1395 }
1396
1397 void ceph_readdir_cache_release(struct ceph_readdir_cache_control *ctl)
1398 {
1399         if (ctl->page) {
1400                 kunmap(ctl->page);
1401                 put_page(ctl->page);
1402                 ctl->page = NULL;
1403         }
1404 }
1405
1406 static int fill_readdir_cache(struct inode *dir, struct dentry *dn,
1407                               struct ceph_readdir_cache_control *ctl,
1408                               struct ceph_mds_request *req)
1409 {
1410         struct ceph_inode_info *ci = ceph_inode(dir);
1411         unsigned nsize = PAGE_SIZE / sizeof(struct dentry*);
1412         unsigned idx = ctl->index % nsize;
1413         pgoff_t pgoff = ctl->index / nsize;
1414
1415         if (!ctl->page || pgoff != page_index(ctl->page)) {
1416                 ceph_readdir_cache_release(ctl);
1417                 if (idx == 0)
1418                         ctl->page = grab_cache_page(&dir->i_data, pgoff);
1419                 else
1420                         ctl->page = find_lock_page(&dir->i_data, pgoff);
1421                 if (!ctl->page) {
1422                         ctl->index = -1;
1423                         return idx == 0 ? -ENOMEM : 0;
1424                 }
1425                 /* reading/filling the cache are serialized by
1426                  * i_mutex, no need to use page lock */
1427                 unlock_page(ctl->page);
1428                 ctl->dentries = kmap(ctl->page);
1429                 if (idx == 0)
1430                         memset(ctl->dentries, 0, PAGE_SIZE);
1431         }
1432
1433         if (req->r_dir_release_cnt == atomic64_read(&ci->i_release_count) &&
1434             req->r_dir_ordered_cnt == atomic64_read(&ci->i_ordered_count)) {
1435                 dout("readdir cache dn %p idx %d\n", dn, ctl->index);
1436                 ctl->dentries[idx] = dn;
1437                 ctl->index++;
1438         } else {
1439                 dout("disable readdir cache\n");
1440                 ctl->index = -1;
1441         }
1442         return 0;
1443 }
1444
1445 int ceph_readdir_prepopulate(struct ceph_mds_request *req,
1446                              struct ceph_mds_session *session)
1447 {
1448         struct dentry *parent = req->r_dentry;
1449         struct ceph_inode_info *ci = ceph_inode(d_inode(parent));
1450         struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1451         struct qstr dname;
1452         struct dentry *dn;
1453         struct inode *in;
1454         int err = 0, skipped = 0, ret, i;
1455         struct inode *snapdir = NULL;
1456         struct ceph_mds_request_head *rhead = req->r_request->front.iov_base;
1457         u32 frag = le32_to_cpu(rhead->args.readdir.frag);
1458         u32 last_hash = 0;
1459         u32 fpos_offset;
1460         struct ceph_readdir_cache_control cache_ctl = {};
1461
1462         if (req->r_aborted)
1463                 return readdir_prepopulate_inodes_only(req, session);
1464
1465         if (rinfo->hash_order && req->r_path2) {
1466                 last_hash = ceph_str_hash(ci->i_dir_layout.dl_dir_hash,
1467                                           req->r_path2, strlen(req->r_path2));
1468                 last_hash = ceph_frag_value(last_hash);
1469         }
1470
1471         if (rinfo->dir_dir &&
1472             le32_to_cpu(rinfo->dir_dir->frag) != frag) {
1473                 dout("readdir_prepopulate got new frag %x -> %x\n",
1474                      frag, le32_to_cpu(rinfo->dir_dir->frag));
1475                 frag = le32_to_cpu(rinfo->dir_dir->frag);
1476                 if (!rinfo->hash_order)
1477                         req->r_readdir_offset = 2;
1478         }
1479
1480         if (le32_to_cpu(rinfo->head->op) == CEPH_MDS_OP_LSSNAP) {
1481                 snapdir = ceph_get_snapdir(d_inode(parent));
1482                 parent = d_find_alias(snapdir);
1483                 dout("readdir_prepopulate %d items under SNAPDIR dn %p\n",
1484                      rinfo->dir_nr, parent);
1485         } else {
1486                 dout("readdir_prepopulate %d items under dn %p\n",
1487                      rinfo->dir_nr, parent);
1488                 if (rinfo->dir_dir)
1489                         ceph_fill_dirfrag(d_inode(parent), rinfo->dir_dir);
1490         }
1491
1492         if (ceph_frag_is_leftmost(frag) && req->r_readdir_offset == 2) {
1493                 /* note dir version at start of readdir so we can tell
1494                  * if any dentries get dropped */
1495                 req->r_dir_release_cnt = atomic64_read(&ci->i_release_count);
1496                 req->r_dir_ordered_cnt = atomic64_read(&ci->i_ordered_count);
1497                 req->r_readdir_cache_idx = 0;
1498         }
1499
1500         cache_ctl.index = req->r_readdir_cache_idx;
1501         fpos_offset = req->r_readdir_offset;
1502
1503         /* FIXME: release caps/leases if error occurs */
1504         for (i = 0; i < rinfo->dir_nr; i++) {
1505                 struct ceph_mds_reply_dir_entry *rde = rinfo->dir_entries + i;
1506                 struct ceph_vino vino;
1507
1508                 dname.name = rde->name;
1509                 dname.len = rde->name_len;
1510                 dname.hash = full_name_hash(dname.name, dname.len);
1511
1512                 vino.ino = le64_to_cpu(rde->inode.in->ino);
1513                 vino.snap = le64_to_cpu(rde->inode.in->snapid);
1514
1515                 if (rinfo->hash_order) {
1516                         u32 hash = ceph_str_hash(ci->i_dir_layout.dl_dir_hash,
1517                                                  rde->name, rde->name_len);
1518                         hash = ceph_frag_value(hash);
1519                         if (hash != last_hash)
1520                                 fpos_offset = 2;
1521                         last_hash = hash;
1522                         rde->offset = ceph_make_fpos(hash, fpos_offset++, true);
1523                 } else {
1524                         rde->offset = ceph_make_fpos(frag, fpos_offset++, false);
1525                 }
1526
1527 retry_lookup:
1528                 dn = d_lookup(parent, &dname);
1529                 dout("d_lookup on parent=%p name=%.*s got %p\n",
1530                      parent, dname.len, dname.name, dn);
1531
1532                 if (!dn) {
1533                         dn = d_alloc(parent, &dname);
1534                         dout("d_alloc %p '%.*s' = %p\n", parent,
1535                              dname.len, dname.name, dn);
1536                         if (dn == NULL) {
1537                                 dout("d_alloc badness\n");
1538                                 err = -ENOMEM;
1539                                 goto out;
1540                         }
1541                         ret = ceph_init_dentry(dn);
1542                         if (ret < 0) {
1543                                 dput(dn);
1544                                 err = ret;
1545                                 goto out;
1546                         }
1547                 } else if (d_really_is_positive(dn) &&
1548                            (ceph_ino(d_inode(dn)) != vino.ino ||
1549                             ceph_snap(d_inode(dn)) != vino.snap)) {
1550                         dout(" dn %p points to wrong inode %p\n",
1551                              dn, d_inode(dn));
1552                         d_delete(dn);
1553                         dput(dn);
1554                         goto retry_lookup;
1555                 }
1556
1557                 /* inode */
1558                 if (d_really_is_positive(dn)) {
1559                         in = d_inode(dn);
1560                 } else {
1561                         in = ceph_get_inode(parent->d_sb, vino);
1562                         if (IS_ERR(in)) {
1563                                 dout("new_inode badness\n");
1564                                 d_drop(dn);
1565                                 dput(dn);
1566                                 err = PTR_ERR(in);
1567                                 goto out;
1568                         }
1569                 }
1570
1571                 ret = fill_inode(in, NULL, &rde->inode, NULL, session,
1572                                  req->r_request_started, -1,
1573                                  &req->r_caps_reservation);
1574                 if (ret < 0) {
1575                         pr_err("fill_inode badness on %p\n", in);
1576                         if (d_really_is_negative(dn))
1577                                 iput(in);
1578                         d_drop(dn);
1579                         err = ret;
1580                         goto next_item;
1581                 }
1582
1583                 if (d_really_is_negative(dn)) {
1584                         struct dentry *realdn;
1585
1586                         if (ceph_security_xattr_deadlock(in)) {
1587                                 dout(" skip splicing dn %p to inode %p"
1588                                      " (security xattr deadlock)\n", dn, in);
1589                                 iput(in);
1590                                 skipped++;
1591                                 goto next_item;
1592                         }
1593
1594                         realdn = splice_dentry(dn, in);
1595                         if (IS_ERR(realdn)) {
1596                                 err = PTR_ERR(realdn);
1597                                 d_drop(dn);
1598                                 dn = NULL;
1599                                 goto next_item;
1600                         }
1601                         dn = realdn;
1602                 }
1603
1604                 ceph_dentry(dn)->offset = rde->offset;
1605
1606                 update_dentry_lease(dn, rde->lease, req->r_session,
1607                                     req->r_request_started);
1608
1609                 if (err == 0 && skipped == 0 && cache_ctl.index >= 0) {
1610                         ret = fill_readdir_cache(d_inode(parent), dn,
1611                                                  &cache_ctl, req);
1612                         if (ret < 0)
1613                                 err = ret;
1614                 }
1615 next_item:
1616                 if (dn)
1617                         dput(dn);
1618         }
1619 out:
1620         if (err == 0 && skipped == 0) {
1621                 req->r_did_prepopulate = true;
1622                 req->r_readdir_cache_idx = cache_ctl.index;
1623         }
1624         ceph_readdir_cache_release(&cache_ctl);
1625         if (snapdir) {
1626                 iput(snapdir);
1627                 dput(parent);
1628         }
1629         dout("readdir_prepopulate done\n");
1630         return err;
1631 }
1632
1633 int ceph_inode_set_size(struct inode *inode, loff_t size)
1634 {
1635         struct ceph_inode_info *ci = ceph_inode(inode);
1636         int ret = 0;
1637
1638         spin_lock(&ci->i_ceph_lock);
1639         dout("set_size %p %llu -> %llu\n", inode, inode->i_size, size);
1640         i_size_write(inode, size);
1641         inode->i_blocks = calc_inode_blocks(size);
1642
1643         /* tell the MDS if we are approaching max_size */
1644         if ((size << 1) >= ci->i_max_size &&
1645             (ci->i_reported_size << 1) < ci->i_max_size)
1646                 ret = 1;
1647
1648         spin_unlock(&ci->i_ceph_lock);
1649         return ret;
1650 }
1651
1652 /*
1653  * Write back inode data in a worker thread.  (This can't be done
1654  * in the message handler context.)
1655  */
1656 void ceph_queue_writeback(struct inode *inode)
1657 {
1658         ihold(inode);
1659         if (queue_work(ceph_inode_to_client(inode)->wb_wq,
1660                        &ceph_inode(inode)->i_wb_work)) {
1661                 dout("ceph_queue_writeback %p\n", inode);
1662         } else {
1663                 dout("ceph_queue_writeback %p failed\n", inode);
1664                 iput(inode);
1665         }
1666 }
1667
1668 static void ceph_writeback_work(struct work_struct *work)
1669 {
1670         struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1671                                                   i_wb_work);
1672         struct inode *inode = &ci->vfs_inode;
1673
1674         dout("writeback %p\n", inode);
1675         filemap_fdatawrite(&inode->i_data);
1676         iput(inode);
1677 }
1678
1679 /*
1680  * queue an async invalidation
1681  */
1682 void ceph_queue_invalidate(struct inode *inode)
1683 {
1684         ihold(inode);
1685         if (queue_work(ceph_inode_to_client(inode)->pg_inv_wq,
1686                        &ceph_inode(inode)->i_pg_inv_work)) {
1687                 dout("ceph_queue_invalidate %p\n", inode);
1688         } else {
1689                 dout("ceph_queue_invalidate %p failed\n", inode);
1690                 iput(inode);
1691         }
1692 }
1693
1694 /*
1695  * Invalidate inode pages in a worker thread.  (This can't be done
1696  * in the message handler context.)
1697  */
1698 static void ceph_invalidate_work(struct work_struct *work)
1699 {
1700         struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1701                                                   i_pg_inv_work);
1702         struct inode *inode = &ci->vfs_inode;
1703         struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1704         u32 orig_gen;
1705         int check = 0;
1706
1707         mutex_lock(&ci->i_truncate_mutex);
1708
1709         if (ACCESS_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) {
1710                 pr_warn_ratelimited("invalidate_pages %p %lld forced umount\n",
1711                                     inode, ceph_ino(inode));
1712                 mapping_set_error(inode->i_mapping, -EIO);
1713                 truncate_pagecache(inode, 0);
1714                 mutex_unlock(&ci->i_truncate_mutex);
1715                 goto out;
1716         }
1717
1718         spin_lock(&ci->i_ceph_lock);
1719         dout("invalidate_pages %p gen %d revoking %d\n", inode,
1720              ci->i_rdcache_gen, ci->i_rdcache_revoking);
1721         if (ci->i_rdcache_revoking != ci->i_rdcache_gen) {
1722                 if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE))
1723                         check = 1;
1724                 spin_unlock(&ci->i_ceph_lock);
1725                 mutex_unlock(&ci->i_truncate_mutex);
1726                 goto out;
1727         }
1728         orig_gen = ci->i_rdcache_gen;
1729         spin_unlock(&ci->i_ceph_lock);
1730
1731         truncate_pagecache(inode, 0);
1732
1733         spin_lock(&ci->i_ceph_lock);
1734         if (orig_gen == ci->i_rdcache_gen &&
1735             orig_gen == ci->i_rdcache_revoking) {
1736                 dout("invalidate_pages %p gen %d successful\n", inode,
1737                      ci->i_rdcache_gen);
1738                 ci->i_rdcache_revoking--;
1739                 check = 1;
1740         } else {
1741                 dout("invalidate_pages %p gen %d raced, now %d revoking %d\n",
1742                      inode, orig_gen, ci->i_rdcache_gen,
1743                      ci->i_rdcache_revoking);
1744                 if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE))
1745                         check = 1;
1746         }
1747         spin_unlock(&ci->i_ceph_lock);
1748         mutex_unlock(&ci->i_truncate_mutex);
1749 out:
1750         if (check)
1751                 ceph_check_caps(ci, 0, NULL);
1752         iput(inode);
1753 }
1754
1755
1756 /*
1757  * called by trunc_wq;
1758  *
1759  * We also truncate in a separate thread as well.
1760  */
1761 static void ceph_vmtruncate_work(struct work_struct *work)
1762 {
1763         struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1764                                                   i_vmtruncate_work);
1765         struct inode *inode = &ci->vfs_inode;
1766
1767         dout("vmtruncate_work %p\n", inode);
1768         __ceph_do_pending_vmtruncate(inode);
1769         iput(inode);
1770 }
1771
1772 /*
1773  * Queue an async vmtruncate.  If we fail to queue work, we will handle
1774  * the truncation the next time we call __ceph_do_pending_vmtruncate.
1775  */
1776 void ceph_queue_vmtruncate(struct inode *inode)
1777 {
1778         struct ceph_inode_info *ci = ceph_inode(inode);
1779
1780         ihold(inode);
1781
1782         if (queue_work(ceph_sb_to_client(inode->i_sb)->trunc_wq,
1783                        &ci->i_vmtruncate_work)) {
1784                 dout("ceph_queue_vmtruncate %p\n", inode);
1785         } else {
1786                 dout("ceph_queue_vmtruncate %p failed, pending=%d\n",
1787                      inode, ci->i_truncate_pending);
1788                 iput(inode);
1789         }
1790 }
1791
1792 /*
1793  * Make sure any pending truncation is applied before doing anything
1794  * that may depend on it.
1795  */
1796 void __ceph_do_pending_vmtruncate(struct inode *inode)
1797 {
1798         struct ceph_inode_info *ci = ceph_inode(inode);
1799         u64 to;
1800         int wrbuffer_refs, finish = 0;
1801
1802         mutex_lock(&ci->i_truncate_mutex);
1803 retry:
1804         spin_lock(&ci->i_ceph_lock);
1805         if (ci->i_truncate_pending == 0) {
1806                 dout("__do_pending_vmtruncate %p none pending\n", inode);
1807                 spin_unlock(&ci->i_ceph_lock);
1808                 mutex_unlock(&ci->i_truncate_mutex);
1809                 return;
1810         }
1811
1812         /*
1813          * make sure any dirty snapped pages are flushed before we
1814          * possibly truncate them.. so write AND block!
1815          */
1816         if (ci->i_wrbuffer_ref_head < ci->i_wrbuffer_ref) {
1817                 dout("__do_pending_vmtruncate %p flushing snaps first\n",
1818                      inode);
1819                 spin_unlock(&ci->i_ceph_lock);
1820                 filemap_write_and_wait_range(&inode->i_data, 0,
1821                                              inode->i_sb->s_maxbytes);
1822                 goto retry;
1823         }
1824
1825         /* there should be no reader or writer */
1826         WARN_ON_ONCE(ci->i_rd_ref || ci->i_wr_ref);
1827
1828         to = ci->i_truncate_size;
1829         wrbuffer_refs = ci->i_wrbuffer_ref;
1830         dout("__do_pending_vmtruncate %p (%d) to %lld\n", inode,
1831              ci->i_truncate_pending, to);
1832         spin_unlock(&ci->i_ceph_lock);
1833
1834         truncate_pagecache(inode, to);
1835
1836         spin_lock(&ci->i_ceph_lock);
1837         if (to == ci->i_truncate_size) {
1838                 ci->i_truncate_pending = 0;
1839                 finish = 1;
1840         }
1841         spin_unlock(&ci->i_ceph_lock);
1842         if (!finish)
1843                 goto retry;
1844
1845         mutex_unlock(&ci->i_truncate_mutex);
1846
1847         if (wrbuffer_refs == 0)
1848                 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
1849
1850         wake_up_all(&ci->i_cap_wq);
1851 }
1852
1853 /*
1854  * symlinks
1855  */
1856 static const struct inode_operations ceph_symlink_iops = {
1857         .readlink = generic_readlink,
1858         .get_link = simple_get_link,
1859         .setattr = ceph_setattr,
1860         .getattr = ceph_getattr,
1861         .setxattr = ceph_setxattr,
1862         .getxattr = ceph_getxattr,
1863         .listxattr = ceph_listxattr,
1864         .removexattr = ceph_removexattr,
1865 };
1866
1867 /*
1868  * setattr
1869  */
1870 int ceph_setattr(struct dentry *dentry, struct iattr *attr)
1871 {
1872         struct inode *inode = d_inode(dentry);
1873         struct ceph_inode_info *ci = ceph_inode(inode);
1874         const unsigned int ia_valid = attr->ia_valid;
1875         struct ceph_mds_request *req;
1876         struct ceph_mds_client *mdsc = ceph_sb_to_client(dentry->d_sb)->mdsc;
1877         struct ceph_cap_flush *prealloc_cf;
1878         int issued;
1879         int release = 0, dirtied = 0;
1880         int mask = 0;
1881         int err = 0;
1882         int inode_dirty_flags = 0;
1883         bool lock_snap_rwsem = false;
1884
1885         if (ceph_snap(inode) != CEPH_NOSNAP)
1886                 return -EROFS;
1887
1888         err = inode_change_ok(inode, attr);
1889         if (err != 0)
1890                 return err;
1891
1892         prealloc_cf = ceph_alloc_cap_flush();
1893         if (!prealloc_cf)
1894                 return -ENOMEM;
1895
1896         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETATTR,
1897                                        USE_AUTH_MDS);
1898         if (IS_ERR(req)) {
1899                 ceph_free_cap_flush(prealloc_cf);
1900                 return PTR_ERR(req);
1901         }
1902
1903         spin_lock(&ci->i_ceph_lock);
1904         issued = __ceph_caps_issued(ci, NULL);
1905
1906         if (!ci->i_head_snapc &&
1907             (issued & (CEPH_CAP_ANY_EXCL | CEPH_CAP_FILE_WR))) {
1908                 lock_snap_rwsem = true;
1909                 if (!down_read_trylock(&mdsc->snap_rwsem)) {
1910                         spin_unlock(&ci->i_ceph_lock);
1911                         down_read(&mdsc->snap_rwsem);
1912                         spin_lock(&ci->i_ceph_lock);
1913                         issued = __ceph_caps_issued(ci, NULL);
1914                 }
1915         }
1916
1917         dout("setattr %p issued %s\n", inode, ceph_cap_string(issued));
1918
1919         if (ia_valid & ATTR_UID) {
1920                 dout("setattr %p uid %d -> %d\n", inode,
1921                      from_kuid(&init_user_ns, inode->i_uid),
1922                      from_kuid(&init_user_ns, attr->ia_uid));
1923                 if (issued & CEPH_CAP_AUTH_EXCL) {
1924                         inode->i_uid = attr->ia_uid;
1925                         dirtied |= CEPH_CAP_AUTH_EXCL;
1926                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1927                            !uid_eq(attr->ia_uid, inode->i_uid)) {
1928                         req->r_args.setattr.uid = cpu_to_le32(
1929                                 from_kuid(&init_user_ns, attr->ia_uid));
1930                         mask |= CEPH_SETATTR_UID;
1931                         release |= CEPH_CAP_AUTH_SHARED;
1932                 }
1933         }
1934         if (ia_valid & ATTR_GID) {
1935                 dout("setattr %p gid %d -> %d\n", inode,
1936                      from_kgid(&init_user_ns, inode->i_gid),
1937                      from_kgid(&init_user_ns, attr->ia_gid));
1938                 if (issued & CEPH_CAP_AUTH_EXCL) {
1939                         inode->i_gid = attr->ia_gid;
1940                         dirtied |= CEPH_CAP_AUTH_EXCL;
1941                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1942                            !gid_eq(attr->ia_gid, inode->i_gid)) {
1943                         req->r_args.setattr.gid = cpu_to_le32(
1944                                 from_kgid(&init_user_ns, attr->ia_gid));
1945                         mask |= CEPH_SETATTR_GID;
1946                         release |= CEPH_CAP_AUTH_SHARED;
1947                 }
1948         }
1949         if (ia_valid & ATTR_MODE) {
1950                 dout("setattr %p mode 0%o -> 0%o\n", inode, inode->i_mode,
1951                      attr->ia_mode);
1952                 if (issued & CEPH_CAP_AUTH_EXCL) {
1953                         inode->i_mode = attr->ia_mode;
1954                         dirtied |= CEPH_CAP_AUTH_EXCL;
1955                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1956                            attr->ia_mode != inode->i_mode) {
1957                         inode->i_mode = attr->ia_mode;
1958                         req->r_args.setattr.mode = cpu_to_le32(attr->ia_mode);
1959                         mask |= CEPH_SETATTR_MODE;
1960                         release |= CEPH_CAP_AUTH_SHARED;
1961                 }
1962         }
1963
1964         if (ia_valid & ATTR_ATIME) {
1965                 dout("setattr %p atime %ld.%ld -> %ld.%ld\n", inode,
1966                      inode->i_atime.tv_sec, inode->i_atime.tv_nsec,
1967                      attr->ia_atime.tv_sec, attr->ia_atime.tv_nsec);
1968                 if (issued & CEPH_CAP_FILE_EXCL) {
1969                         ci->i_time_warp_seq++;
1970                         inode->i_atime = attr->ia_atime;
1971                         dirtied |= CEPH_CAP_FILE_EXCL;
1972                 } else if ((issued & CEPH_CAP_FILE_WR) &&
1973                            timespec_compare(&inode->i_atime,
1974                                             &attr->ia_atime) < 0) {
1975                         inode->i_atime = attr->ia_atime;
1976                         dirtied |= CEPH_CAP_FILE_WR;
1977                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1978                            !timespec_equal(&inode->i_atime, &attr->ia_atime)) {
1979                         ceph_encode_timespec(&req->r_args.setattr.atime,
1980                                              &attr->ia_atime);
1981                         mask |= CEPH_SETATTR_ATIME;
1982                         release |= CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_RD |
1983                                 CEPH_CAP_FILE_WR;
1984                 }
1985         }
1986         if (ia_valid & ATTR_MTIME) {
1987                 dout("setattr %p mtime %ld.%ld -> %ld.%ld\n", inode,
1988                      inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
1989                      attr->ia_mtime.tv_sec, attr->ia_mtime.tv_nsec);
1990                 if (issued & CEPH_CAP_FILE_EXCL) {
1991                         ci->i_time_warp_seq++;
1992                         inode->i_mtime = attr->ia_mtime;
1993                         dirtied |= CEPH_CAP_FILE_EXCL;
1994                 } else if ((issued & CEPH_CAP_FILE_WR) &&
1995                            timespec_compare(&inode->i_mtime,
1996                                             &attr->ia_mtime) < 0) {
1997                         inode->i_mtime = attr->ia_mtime;
1998                         dirtied |= CEPH_CAP_FILE_WR;
1999                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
2000                            !timespec_equal(&inode->i_mtime, &attr->ia_mtime)) {
2001                         ceph_encode_timespec(&req->r_args.setattr.mtime,
2002                                              &attr->ia_mtime);
2003                         mask |= CEPH_SETATTR_MTIME;
2004                         release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD |
2005                                 CEPH_CAP_FILE_WR;
2006                 }
2007         }
2008         if (ia_valid & ATTR_SIZE) {
2009                 dout("setattr %p size %lld -> %lld\n", inode,
2010                      inode->i_size, attr->ia_size);
2011                 if ((issued & CEPH_CAP_FILE_EXCL) &&
2012                     attr->ia_size > inode->i_size) {
2013                         i_size_write(inode, attr->ia_size);
2014                         inode->i_blocks = calc_inode_blocks(attr->ia_size);
2015                         inode->i_ctime = attr->ia_ctime;
2016                         ci->i_reported_size = attr->ia_size;
2017                         dirtied |= CEPH_CAP_FILE_EXCL;
2018                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
2019                            attr->ia_size != inode->i_size) {
2020                         req->r_args.setattr.size = cpu_to_le64(attr->ia_size);
2021                         req->r_args.setattr.old_size =
2022                                 cpu_to_le64(inode->i_size);
2023                         mask |= CEPH_SETATTR_SIZE;
2024                         release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD |
2025                                 CEPH_CAP_FILE_WR;
2026                 }
2027         }
2028
2029         /* these do nothing */
2030         if (ia_valid & ATTR_CTIME) {
2031                 bool only = (ia_valid & (ATTR_SIZE|ATTR_MTIME|ATTR_ATIME|
2032                                          ATTR_MODE|ATTR_UID|ATTR_GID)) == 0;
2033                 dout("setattr %p ctime %ld.%ld -> %ld.%ld (%s)\n", inode,
2034                      inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
2035                      attr->ia_ctime.tv_sec, attr->ia_ctime.tv_nsec,
2036                      only ? "ctime only" : "ignored");
2037                 inode->i_ctime = attr->ia_ctime;
2038                 if (only) {
2039                         /*
2040                          * if kernel wants to dirty ctime but nothing else,
2041                          * we need to choose a cap to dirty under, or do
2042                          * a almost-no-op setattr
2043                          */
2044                         if (issued & CEPH_CAP_AUTH_EXCL)
2045                                 dirtied |= CEPH_CAP_AUTH_EXCL;
2046                         else if (issued & CEPH_CAP_FILE_EXCL)
2047                                 dirtied |= CEPH_CAP_FILE_EXCL;
2048                         else if (issued & CEPH_CAP_XATTR_EXCL)
2049                                 dirtied |= CEPH_CAP_XATTR_EXCL;
2050                         else
2051                                 mask |= CEPH_SETATTR_CTIME;
2052                 }
2053         }
2054         if (ia_valid & ATTR_FILE)
2055                 dout("setattr %p ATTR_FILE ... hrm!\n", inode);
2056
2057         if (dirtied) {
2058                 inode_dirty_flags = __ceph_mark_dirty_caps(ci, dirtied,
2059                                                            &prealloc_cf);
2060                 inode->i_ctime = current_fs_time(inode->i_sb);
2061         }
2062
2063         release &= issued;
2064         spin_unlock(&ci->i_ceph_lock);
2065         if (lock_snap_rwsem)
2066                 up_read(&mdsc->snap_rwsem);
2067
2068         if (inode_dirty_flags)
2069                 __mark_inode_dirty(inode, inode_dirty_flags);
2070
2071         if (ia_valid & ATTR_MODE) {
2072                 err = posix_acl_chmod(inode, attr->ia_mode);
2073                 if (err)
2074                         goto out_put;
2075         }
2076
2077         if (mask) {
2078                 req->r_inode = inode;
2079                 ihold(inode);
2080                 req->r_inode_drop = release;
2081                 req->r_args.setattr.mask = cpu_to_le32(mask);
2082                 req->r_num_caps = 1;
2083                 err = ceph_mdsc_do_request(mdsc, NULL, req);
2084         }
2085         dout("setattr %p result=%d (%s locally, %d remote)\n", inode, err,
2086              ceph_cap_string(dirtied), mask);
2087
2088         ceph_mdsc_put_request(req);
2089         if (mask & CEPH_SETATTR_SIZE)
2090                 __ceph_do_pending_vmtruncate(inode);
2091         ceph_free_cap_flush(prealloc_cf);
2092         return err;
2093 out_put:
2094         ceph_mdsc_put_request(req);
2095         ceph_free_cap_flush(prealloc_cf);
2096         return err;
2097 }
2098
2099 /*
2100  * Verify that we have a lease on the given mask.  If not,
2101  * do a getattr against an mds.
2102  */
2103 int __ceph_do_getattr(struct inode *inode, struct page *locked_page,
2104                       int mask, bool force)
2105 {
2106         struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
2107         struct ceph_mds_client *mdsc = fsc->mdsc;
2108         struct ceph_mds_request *req;
2109         int err;
2110
2111         if (ceph_snap(inode) == CEPH_SNAPDIR) {
2112                 dout("do_getattr inode %p SNAPDIR\n", inode);
2113                 return 0;
2114         }
2115
2116         dout("do_getattr inode %p mask %s mode 0%o\n",
2117              inode, ceph_cap_string(mask), inode->i_mode);
2118         if (!force && ceph_caps_issued_mask(ceph_inode(inode), mask, 1))
2119                 return 0;
2120
2121         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
2122         if (IS_ERR(req))
2123                 return PTR_ERR(req);
2124         req->r_inode = inode;
2125         ihold(inode);
2126         req->r_num_caps = 1;
2127         req->r_args.getattr.mask = cpu_to_le32(mask);
2128         req->r_locked_page = locked_page;
2129         err = ceph_mdsc_do_request(mdsc, NULL, req);
2130         if (locked_page && err == 0) {
2131                 u64 inline_version = req->r_reply_info.targeti.inline_version;
2132                 if (inline_version == 0) {
2133                         /* the reply is supposed to contain inline data */
2134                         err = -EINVAL;
2135                 } else if (inline_version == CEPH_INLINE_NONE) {
2136                         err = -ENODATA;
2137                 } else {
2138                         err = req->r_reply_info.targeti.inline_len;
2139                 }
2140         }
2141         ceph_mdsc_put_request(req);
2142         dout("do_getattr result=%d\n", err);
2143         return err;
2144 }
2145
2146
2147 /*
2148  * Check inode permissions.  We verify we have a valid value for
2149  * the AUTH cap, then call the generic handler.
2150  */
2151 int ceph_permission(struct inode *inode, int mask)
2152 {
2153         int err;
2154
2155         if (mask & MAY_NOT_BLOCK)
2156                 return -ECHILD;
2157
2158         err = ceph_do_getattr(inode, CEPH_CAP_AUTH_SHARED, false);
2159
2160         if (!err)
2161                 err = generic_permission(inode, mask);
2162         return err;
2163 }
2164
2165 /*
2166  * Get all attributes.  Hopefully somedata we'll have a statlite()
2167  * and can limit the fields we require to be accurate.
2168  */
2169 int ceph_getattr(struct vfsmount *mnt, struct dentry *dentry,
2170                  struct kstat *stat)
2171 {
2172         struct inode *inode = d_inode(dentry);
2173         struct ceph_inode_info *ci = ceph_inode(inode);
2174         int err;
2175
2176         err = ceph_do_getattr(inode, CEPH_STAT_CAP_INODE_ALL, false);
2177         if (!err) {
2178                 generic_fillattr(inode, stat);
2179                 stat->ino = ceph_translate_ino(inode->i_sb, inode->i_ino);
2180                 if (ceph_snap(inode) != CEPH_NOSNAP)
2181                         stat->dev = ceph_snap(inode);
2182                 else
2183                         stat->dev = 0;
2184                 if (S_ISDIR(inode->i_mode)) {
2185                         if (ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb),
2186                                                 RBYTES))
2187                                 stat->size = ci->i_rbytes;
2188                         else
2189                                 stat->size = ci->i_files + ci->i_subdirs;
2190                         stat->blocks = 0;
2191                         stat->blksize = 65536;
2192                 }
2193         }
2194         return err;
2195 }