fs/ceph/inode.c

   1 #include <linux/ceph/ceph_debug.h>
   2
   3 #include <linux/module.h>
   4 #include <linux/fs.h>
   5 #include <linux/slab.h>
   6 #include <linux/string.h>
   7 #include <linux/uaccess.h>
   8 #include <linux/kernel.h>
   9 #include <linux/writeback.h>
  10 #include <linux/vmalloc.h>
  11 #include <linux/xattr.h>
  12 #include <linux/posix_acl.h>
  13 #include <linux/random.h>
  14 #include <linux/sort.h>
  15
  16 #include "super.h"
  17 #include "mds_client.h"
  18 #include "cache.h"
  19 #include <linux/ceph/decode.h>
  20
  21 /*
  22  * Ceph inode operations
  23  *
  24  * Implement basic inode helpers (get, alloc) and inode ops (getattr,
  25  * setattr, etc.), xattr helpers, and helpers for assimilating
  26  * metadata returned by the MDS into our cache.
  27  *
  28  * Also define helpers for doing asynchronous writeback, invalidation,
  29  * and truncation for the benefit of those who can't afford to block
  30  * (typically because they are in the message handler path).
  31  */
  32
  33 static const struct inode_operations ceph_symlink_iops;
  34
  35 static void ceph_invalidate_work(struct work_struct *work);
  36 static void ceph_writeback_work(struct work_struct *work);
  37 static void ceph_vmtruncate_work(struct work_struct *work);
  38
  39 /*
  40  * find or create an inode, given the ceph ino number
  41  */
  42 static int ceph_set_ino_cb(struct inode *inode, void *data)
  43 {
  44         ceph_inode(inode)->i_vino = *(struct ceph_vino *)data;
  45         inode->i_ino = ceph_vino_to_ino(*(struct ceph_vino *)data);
  46         return 0;
  47 }
  48
  49 struct inode *ceph_get_inode(struct super_block *sb, struct ceph_vino vino)
  50 {
  51         struct inode *inode;
  52         ino_t t = ceph_vino_to_ino(vino);
  53
  54         inode = iget5_locked(sb, t, ceph_ino_compare, ceph_set_ino_cb, &vino);
  55         if (inode == NULL)
  56                 return ERR_PTR(-ENOMEM);
  57         if (inode->i_state & I_NEW) {
  58                 dout("get_inode created new inode %p %llx.%llx ino %llx\n",
  59                      inode, ceph_vinop(inode), (u64)inode->i_ino);
  60                 unlock_new_inode(inode);
  61         }
  62
  63         dout("get_inode on %lu=%llx.%llx got %p\n", inode->i_ino, vino.ino,
  64              vino.snap, inode);
  65         return inode;
  66 }
  67
  68 /*
  69  * get/constuct snapdir inode for a given directory
  70  */
  71 struct inode *ceph_get_snapdir(struct inode *parent)
  72 {
  73         struct ceph_vino vino = {
  74                 .ino = ceph_ino(parent),
  75                 .snap = CEPH_SNAPDIR,
  76         };
  77         struct inode *inode = ceph_get_inode(parent->i_sb, vino);
  78         struct ceph_inode_info *ci = ceph_inode(inode);
  79
  80         BUG_ON(!S_ISDIR(parent->i_mode));
  81         if (IS_ERR(inode))
  82                 return inode;
  83         inode->i_mode = parent->i_mode;
  84         inode->i_uid = parent->i_uid;
  85         inode->i_gid = parent->i_gid;
  86         inode->i_op = &ceph_snapdir_iops;
  87         inode->i_fop = &ceph_snapdir_fops;
  88         ci->i_snap_caps = CEPH_CAP_PIN; /* so we can open */
  89         ci->i_rbytes = 0;
  90         return inode;
  91 }
  92
  93 const struct inode_operations ceph_file_iops = {
  94         .permission = ceph_permission,
  95         .setattr = ceph_setattr,
  96         .getattr = ceph_getattr,
  97         .setxattr = generic_setxattr,
  98         .getxattr = generic_getxattr,
  99         .listxattr = ceph_listxattr,
 100         .removexattr = generic_removexattr,
 101         .get_acl = ceph_get_acl,
 102         .set_acl = ceph_set_acl,
 103 };
 104
 105
 106 /*
 107  * We use a 'frag tree' to keep track of the MDS's directory fragments
 108  * for a given inode (usually there is just a single fragment).  We
 109  * need to know when a child frag is delegated to a new MDS, or when
 110  * it is flagged as replicated, so we can direct our requests
 111  * accordingly.
 112  */
 113
 114 /*
 115  * find/create a frag in the tree
 116  */
 117 static struct ceph_inode_frag *__get_or_create_frag(struct ceph_inode_info *ci,
 118                                                     u32 f)
 119 {
 120         struct rb_node **p;
 121         struct rb_node *parent = NULL;
 122         struct ceph_inode_frag *frag;
 123         int c;
 124
 125         p = &ci->i_fragtree.rb_node;
 126         while (*p) {
 127                 parent = *p;
 128                 frag = rb_entry(parent, struct ceph_inode_frag, node);
 129                 c = ceph_frag_compare(f, frag->frag);
 130                 if (c < 0)
 131                         p = &(*p)->rb_left;
 132                 else if (c > 0)
 133                         p = &(*p)->rb_right;
 134                 else
 135                         return frag;
 136         }
 137
 138         frag = kmalloc(sizeof(*frag), GFP_NOFS);
 139         if (!frag) {
 140                 pr_err("__get_or_create_frag ENOMEM on %p %llx.%llx "
 141                        "frag %x\n", &ci->vfs_inode,
 142                        ceph_vinop(&ci->vfs_inode), f);
 143                 return ERR_PTR(-ENOMEM);
 144         }
 145         frag->frag = f;
 146         frag->split_by = 0;
 147         frag->mds = -1;
 148         frag->ndist = 0;
 149
 150         rb_link_node(&frag->node, parent, p);
 151         rb_insert_color(&frag->node, &ci->i_fragtree);
 152
 153         dout("get_or_create_frag added %llx.%llx frag %x\n",
 154              ceph_vinop(&ci->vfs_inode), f);
 155         return frag;
 156 }
 157
 158 /*
 159  * find a specific frag @f
 160  */
 161 struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci, u32 f)
 162 {
 163         struct rb_node *n = ci->i_fragtree.rb_node;
 164
 165         while (n) {
 166                 struct ceph_inode_frag *frag =
 167                         rb_entry(n, struct ceph_inode_frag, node);
 168                 int c = ceph_frag_compare(f, frag->frag);
 169                 if (c < 0)
 170                         n = n->rb_left;
 171                 else if (c > 0)
 172                         n = n->rb_right;
 173                 else
 174                         return frag;
 175         }
 176         return NULL;
 177 }
 178
 179 /*
 180  * Choose frag containing the given value @v.  If @pfrag is
 181  * specified, copy the frag delegation info to the caller if
 182  * it is present.
 183  */
 184 static u32 __ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
 185                               struct ceph_inode_frag *pfrag, int *found)
 186 {
 187         u32 t = ceph_frag_make(0, 0);
 188         struct ceph_inode_frag *frag;
 189         unsigned nway, i;
 190         u32 n;
 191
 192         if (found)
 193                 *found = 0;
 194
 195         while (1) {
 196                 WARN_ON(!ceph_frag_contains_value(t, v));
 197                 frag = __ceph_find_frag(ci, t);
 198                 if (!frag)
 199                         break; /* t is a leaf */
 200                 if (frag->split_by == 0) {
 201                         if (pfrag)
 202                                 memcpy(pfrag, frag, sizeof(*pfrag));
 203                         if (found)
 204                                 *found = 1;
 205                         break;
 206                 }
 207
 208                 /* choose child */
 209                 nway = 1 << frag->split_by;
 210                 dout("choose_frag(%x) %x splits by %d (%d ways)\n", v, t,
 211                      frag->split_by, nway);
 212                 for (i = 0; i < nway; i++) {
 213                         n = ceph_frag_make_child(t, frag->split_by, i);
 214                         if (ceph_frag_contains_value(n, v)) {
 215                                 t = n;
 216                                 break;
 217                         }
 218                 }
 219                 BUG_ON(i == nway);
 220         }
 221         dout("choose_frag(%x) = %x\n", v, t);
 222
 223         return t;
 224 }
 225
 226 u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
 227                      struct ceph_inode_frag *pfrag, int *found)
 228 {
 229         u32 ret;
 230         mutex_lock(&ci->i_fragtree_mutex);
 231         ret = __ceph_choose_frag(ci, v, pfrag, found);
 232         mutex_unlock(&ci->i_fragtree_mutex);
 233         return ret;
 234 }
 235
 236 /*
 237  * Process dirfrag (delegation) info from the mds.  Include leaf
 238  * fragment in tree ONLY if ndist > 0.  Otherwise, only
 239  * branches/splits are included in i_fragtree)
 240  */
 241 static int ceph_fill_dirfrag(struct inode *inode,
 242                              struct ceph_mds_reply_dirfrag *dirinfo)
 243 {
 244         struct ceph_inode_info *ci = ceph_inode(inode);
 245         struct ceph_inode_frag *frag;
 246         u32 id = le32_to_cpu(dirinfo->frag);
 247         int mds = le32_to_cpu(dirinfo->auth);
 248         int ndist = le32_to_cpu(dirinfo->ndist);
 249         int diri_auth = -1;
 250         int i;
 251         int err = 0;
 252
 253         spin_lock(&ci->i_ceph_lock);
 254         if (ci->i_auth_cap)
 255                 diri_auth = ci->i_auth_cap->mds;
 256         spin_unlock(&ci->i_ceph_lock);
 257
 258         if (mds == -1) /* CDIR_AUTH_PARENT */
 259                 mds = diri_auth;
 260
 261         mutex_lock(&ci->i_fragtree_mutex);
 262         if (ndist == 0 && mds == diri_auth) {
 263                 /* no delegation info needed. */
 264                 frag = __ceph_find_frag(ci, id);
 265                 if (!frag)
 266                         goto out;
 267                 if (frag->split_by == 0) {
 268                         /* tree leaf, remove */
 269                         dout("fill_dirfrag removed %llx.%llx frag %x"
 270                              " (no ref)\n", ceph_vinop(inode), id);
 271                         rb_erase(&frag->node, &ci->i_fragtree);
 272                         kfree(frag);
 273                 } else {
 274                         /* tree branch, keep and clear */
 275                         dout("fill_dirfrag cleared %llx.%llx frag %x"
 276                              " referral\n", ceph_vinop(inode), id);
 277                         frag->mds = -1;
 278                         frag->ndist = 0;
 279                 }
 280                 goto out;
 281         }
 282
 283
 284         /* find/add this frag to store mds delegation info */
 285         frag = __get_or_create_frag(ci, id);
 286         if (IS_ERR(frag)) {
 287                 /* this is not the end of the world; we can continue
 288                    with bad/inaccurate delegation info */
 289                 pr_err("fill_dirfrag ENOMEM on mds ref %llx.%llx fg %x\n",
 290                        ceph_vinop(inode), le32_to_cpu(dirinfo->frag));
 291                 err = -ENOMEM;
 292                 goto out;
 293         }
 294
 295         frag->mds = mds;
 296         frag->ndist = min_t(u32, ndist, CEPH_MAX_DIRFRAG_REP);
 297         for (i = 0; i < frag->ndist; i++)
 298                 frag->dist[i] = le32_to_cpu(dirinfo->dist[i]);
 299         dout("fill_dirfrag %llx.%llx frag %x ndist=%d\n",
 300              ceph_vinop(inode), frag->frag, frag->ndist);
 301
 302 out:
 303         mutex_unlock(&ci->i_fragtree_mutex);
 304         return err;
 305 }
 306
 307 static int frag_tree_split_cmp(const void *l, const void *r)
 308 {
 309         struct ceph_frag_tree_split *ls = (struct ceph_frag_tree_split*)l;
 310         struct ceph_frag_tree_split *rs = (struct ceph_frag_tree_split*)r;
 311         return ceph_frag_compare(ls->frag, rs->frag);
 312 }
 313
 314 static bool is_frag_child(u32 f, struct ceph_inode_frag *frag)
 315 {
 316         if (!frag)
 317                 return f == ceph_frag_make(0, 0);
 318         if (ceph_frag_bits(f) != ceph_frag_bits(frag->frag) + frag->split_by)
 319                 return false;
 320         return ceph_frag_contains_value(frag->frag, ceph_frag_value(f));
 321 }
 322
 323 static int ceph_fill_fragtree(struct inode *inode,
 324                               struct ceph_frag_tree_head *fragtree,
 325                               struct ceph_mds_reply_dirfrag *dirinfo)
 326 {
 327         struct ceph_inode_info *ci = ceph_inode(inode);
 328         struct ceph_inode_frag *frag, *prev_frag = NULL;
 329         struct rb_node *rb_node;
 330         unsigned i, split_by, nsplits;
 331         u32 id;
 332         bool update = false;
 333
 334         mutex_lock(&ci->i_fragtree_mutex);
 335         nsplits = le32_to_cpu(fragtree->nsplits);
 336         if (nsplits != ci->i_fragtree_nsplits) {
 337                 update = true;
 338         } else if (nsplits) {
 339                 i = prandom_u32() % nsplits;
 340                 id = le32_to_cpu(fragtree->splits[i].frag);
 341                 if (!__ceph_find_frag(ci, id))
 342                         update = true;
 343         } else if (!RB_EMPTY_ROOT(&ci->i_fragtree)) {
 344                 rb_node = rb_first(&ci->i_fragtree);
 345                 frag = rb_entry(rb_node, struct ceph_inode_frag, node);
 346                 if (frag->frag != ceph_frag_make(0, 0) || rb_next(rb_node))
 347                         update = true;
 348         }
 349         if (!update && dirinfo) {
 350                 id = le32_to_cpu(dirinfo->frag);
 351                 if (id != __ceph_choose_frag(ci, id, NULL, NULL))
 352                         update = true;
 353         }
 354         if (!update)
 355                 goto out_unlock;
 356
 357         if (nsplits > 1) {
 358                 sort(fragtree->splits, nsplits, sizeof(fragtree->splits[0]),
 359                      frag_tree_split_cmp, NULL);
 360         }
 361
 362         dout("fill_fragtree %llx.%llx\n", ceph_vinop(inode));
 363         rb_node = rb_first(&ci->i_fragtree);
 364         for (i = 0; i < nsplits; i++) {
 365                 id = le32_to_cpu(fragtree->splits[i].frag);
 366                 split_by = le32_to_cpu(fragtree->splits[i].by);
 367                 if (split_by == 0 || ceph_frag_bits(id) + split_by > 24) {
 368                         pr_err("fill_fragtree %llx.%llx invalid split %d/%u, "
 369                                "frag %x split by %d\n", ceph_vinop(inode),
 370                                i, nsplits, id, split_by);
 371                         continue;
 372                 }
 373                 frag = NULL;
 374                 while (rb_node) {
 375                         frag = rb_entry(rb_node, struct ceph_inode_frag, node);
 376                         if (ceph_frag_compare(frag->frag, id) >= 0) {
 377                                 if (frag->frag != id)
 378                                         frag = NULL;
 379                                 else
 380                                         rb_node = rb_next(rb_node);
 381                                 break;
 382                         }
 383                         rb_node = rb_next(rb_node);
 384                         /* delete stale split/leaf node */
 385                         if (frag->split_by > 0 ||
 386                             !is_frag_child(frag->frag, prev_frag)) {
 387                                 rb_erase(&frag->node, &ci->i_fragtree);
 388                                 if (frag->split_by > 0)
 389                                         ci->i_fragtree_nsplits--;
 390                                 kfree(frag);
 391                         }
 392                         frag = NULL;
 393                 }
 394                 if (!frag) {
 395                         frag = __get_or_create_frag(ci, id);
 396                         if (IS_ERR(frag))
 397                                 continue;
 398                 }
 399                 if (frag->split_by == 0)
 400                         ci->i_fragtree_nsplits++;
 401                 frag->split_by = split_by;
 402                 dout(" frag %x split by %d\n", frag->frag, frag->split_by);
 403                 prev_frag = frag;
 404         }
 405         while (rb_node) {
 406                 frag = rb_entry(rb_node, struct ceph_inode_frag, node);
 407                 rb_node = rb_next(rb_node);
 408                 /* delete stale split/leaf node */
 409                 if (frag->split_by > 0 ||
 410                     !is_frag_child(frag->frag, prev_frag)) {
 411                         rb_erase(&frag->node, &ci->i_fragtree);
 412                         if (frag->split_by > 0)
 413                                 ci->i_fragtree_nsplits--;
 414                         kfree(frag);
 415                 }
 416         }
 417 out_unlock:
 418         mutex_unlock(&ci->i_fragtree_mutex);
 419         return 0;
 420 }
 421
 422 /*
 423  * initialize a newly allocated inode.
 424  */
 425 struct inode *ceph_alloc_inode(struct super_block *sb)
 426 {
 427         struct ceph_inode_info *ci;
 428         int i;
 429
 430         ci = kmem_cache_alloc(ceph_inode_cachep, GFP_NOFS);
 431         if (!ci)
 432                 return NULL;
 433
 434         dout("alloc_inode %p\n", &ci->vfs_inode);
 435
 436         spin_lock_init(&ci->i_ceph_lock);
 437
 438         ci->i_version = 0;
 439         ci->i_inline_version = 0;
 440         ci->i_time_warp_seq = 0;
 441         ci->i_ceph_flags = 0;
 442         atomic64_set(&ci->i_ordered_count, 1);
 443         atomic64_set(&ci->i_release_count, 1);
 444         atomic64_set(&ci->i_complete_seq[0], 0);
 445         atomic64_set(&ci->i_complete_seq[1], 0);
 446         ci->i_symlink = NULL;
 447
 448         memset(&ci->i_dir_layout, 0, sizeof(ci->i_dir_layout));
 449         ci->i_pool_ns_len = 0;
 450
 451         ci->i_fragtree = RB_ROOT;
 452         mutex_init(&ci->i_fragtree_mutex);
 453
 454         ci->i_xattrs.blob = NULL;
 455         ci->i_xattrs.prealloc_blob = NULL;
 456         ci->i_xattrs.dirty = false;
 457         ci->i_xattrs.index = RB_ROOT;
 458         ci->i_xattrs.count = 0;
 459         ci->i_xattrs.names_size = 0;
 460         ci->i_xattrs.vals_size = 0;
 461         ci->i_xattrs.version = 0;
 462         ci->i_xattrs.index_version = 0;
 463
 464         ci->i_caps = RB_ROOT;
 465         ci->i_auth_cap = NULL;
 466         ci->i_dirty_caps = 0;
 467         ci->i_flushing_caps = 0;
 468         INIT_LIST_HEAD(&ci->i_dirty_item);
 469         INIT_LIST_HEAD(&ci->i_flushing_item);
 470         ci->i_prealloc_cap_flush = NULL;
 471         ci->i_cap_flush_tree = RB_ROOT;
 472         init_waitqueue_head(&ci->i_cap_wq);
 473         ci->i_hold_caps_min = 0;
 474         ci->i_hold_caps_max = 0;
 475         INIT_LIST_HEAD(&ci->i_cap_delay_list);
 476         INIT_LIST_HEAD(&ci->i_cap_snaps);
 477         ci->i_head_snapc = NULL;
 478         ci->i_snap_caps = 0;
 479
 480         for (i = 0; i < CEPH_FILE_MODE_NUM; i++)
 481                 ci->i_nr_by_mode[i] = 0;
 482
 483         mutex_init(&ci->i_truncate_mutex);
 484         ci->i_truncate_seq = 0;
 485         ci->i_truncate_size = 0;
 486         ci->i_truncate_pending = 0;
 487
 488         ci->i_max_size = 0;
 489         ci->i_reported_size = 0;
 490         ci->i_wanted_max_size = 0;
 491         ci->i_requested_max_size = 0;
 492
 493         ci->i_pin_ref = 0;
 494         ci->i_rd_ref = 0;
 495         ci->i_rdcache_ref = 0;
 496         ci->i_wr_ref = 0;
 497         ci->i_wb_ref = 0;
 498         ci->i_wrbuffer_ref = 0;
 499         ci->i_wrbuffer_ref_head = 0;
 500         ci->i_shared_gen = 0;
 501         ci->i_rdcache_gen = 0;
 502         ci->i_rdcache_revoking = 0;
 503
 504         INIT_LIST_HEAD(&ci->i_unsafe_writes);
 505         INIT_LIST_HEAD(&ci->i_unsafe_dirops);
 506         INIT_LIST_HEAD(&ci->i_unsafe_iops);
 507         spin_lock_init(&ci->i_unsafe_lock);
 508
 509         ci->i_snap_realm = NULL;
 510         INIT_LIST_HEAD(&ci->i_snap_realm_item);
 511         INIT_LIST_HEAD(&ci->i_snap_flush_item);
 512
 513         INIT_WORK(&ci->i_wb_work, ceph_writeback_work);
 514         INIT_WORK(&ci->i_pg_inv_work, ceph_invalidate_work);
 515
 516         INIT_WORK(&ci->i_vmtruncate_work, ceph_vmtruncate_work);
 517
 518         ceph_fscache_inode_init(ci);
 519
 520         return &ci->vfs_inode;
 521 }
 522
 523 static void ceph_i_callback(struct rcu_head *head)
 524 {
 525         struct inode *inode = container_of(head, struct inode, i_rcu);
 526         struct ceph_inode_info *ci = ceph_inode(inode);
 527
 528         kmem_cache_free(ceph_inode_cachep, ci);
 529 }
 530
 531 void ceph_destroy_inode(struct inode *inode)
 532 {
 533         struct ceph_inode_info *ci = ceph_inode(inode);
 534         struct ceph_inode_frag *frag;
 535         struct rb_node *n;
 536
 537         dout("destroy_inode %p ino %llx.%llx\n", inode, ceph_vinop(inode));
 538
 539         ceph_fscache_unregister_inode_cookie(ci);
 540
 541         ceph_queue_caps_release(inode);
 542
 543         /*
 544          * we may still have a snap_realm reference if there are stray
 545          * caps in i_snap_caps.
 546          */
 547         if (ci->i_snap_realm) {
 548                 struct ceph_mds_client *mdsc =
 549                         ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc;
 550                 struct ceph_snap_realm *realm = ci->i_snap_realm;
 551
 552                 dout(" dropping residual ref to snap realm %p\n", realm);
 553                 spin_lock(&realm->inodes_with_caps_lock);
 554                 list_del_init(&ci->i_snap_realm_item);
 555                 spin_unlock(&realm->inodes_with_caps_lock);
 556                 ceph_put_snap_realm(mdsc, realm);
 557         }
 558
 559         kfree(ci->i_symlink);
 560         while ((n = rb_first(&ci->i_fragtree)) != NULL) {
 561                 frag = rb_entry(n, struct ceph_inode_frag, node);
 562                 rb_erase(n, &ci->i_fragtree);
 563                 kfree(frag);
 564         }
 565         ci->i_fragtree_nsplits = 0;
 566
 567         __ceph_destroy_xattrs(ci);
 568         if (ci->i_xattrs.blob)
 569                 ceph_buffer_put(ci->i_xattrs.blob);
 570         if (ci->i_xattrs.prealloc_blob)
 571                 ceph_buffer_put(ci->i_xattrs.prealloc_blob);
 572
 573         call_rcu(&inode->i_rcu, ceph_i_callback);
 574 }
 575
 576 int ceph_drop_inode(struct inode *inode)
 577 {
 578         /*
 579          * Positve dentry and corresponding inode are always accompanied
 580          * in MDS reply. So no need to keep inode in the cache after
 581          * dropping all its aliases.
 582          */
 583         return 1;
 584 }
 585
 586 static inline blkcnt_t calc_inode_blocks(u64 size)
 587 {
 588         return (size + (1<<9) - 1) >> 9;
 589 }
 590
 591 /*
 592  * Helpers to fill in size, ctime, mtime, and atime.  We have to be
 593  * careful because either the client or MDS may have more up to date
 594  * info, depending on which capabilities are held, and whether
 595  * time_warp_seq or truncate_seq have increased.  (Ordinarily, mtime
 596  * and size are monotonically increasing, except when utimes() or
 597  * truncate() increments the corresponding _seq values.)
 598  */
 599 int ceph_fill_file_size(struct inode *inode, int issued,
 600                         u32 truncate_seq, u64 truncate_size, u64 size)
 601 {
 602         struct ceph_inode_info *ci = ceph_inode(inode);
 603         int queue_trunc = 0;
 604
 605         if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) > 0 ||
 606             (truncate_seq == ci->i_truncate_seq && size > inode->i_size)) {
 607                 dout("size %lld -> %llu\n", inode->i_size, size);
 608                 if (size > 0 && S_ISDIR(inode->i_mode)) {
 609                         pr_err("fill_file_size non-zero size for directory\n");
 610                         size = 0;
 611                 }
 612                 i_size_write(inode, size);
 613                 inode->i_blocks = calc_inode_blocks(size);
 614                 ci->i_reported_size = size;
 615                 if (truncate_seq != ci->i_truncate_seq) {
 616                         dout("truncate_seq %u -> %u\n",
 617                              ci->i_truncate_seq, truncate_seq);
 618                         ci->i_truncate_seq = truncate_seq;
 619
 620                         /* the MDS should have revoked these caps */
 621                         WARN_ON_ONCE(issued & (CEPH_CAP_FILE_EXCL |
 622                                                CEPH_CAP_FILE_RD |
 623                                                CEPH_CAP_FILE_WR |
 624                                                CEPH_CAP_FILE_LAZYIO));
 625                         /*
 626                          * If we hold relevant caps, or in the case where we're
 627                          * not the only client referencing this file and we
 628                          * don't hold those caps, then we need to check whether
 629                          * the file is either opened or mmaped
 630                          */
 631                         if ((issued & (CEPH_CAP_FILE_CACHE|
 632                                        CEPH_CAP_FILE_BUFFER)) ||
 633                             mapping_mapped(inode->i_mapping) ||
 634                             __ceph_caps_file_wanted(ci)) {
 635                                 ci->i_truncate_pending++;
 636                                 queue_trunc = 1;
 637                         }
 638                 }
 639         }
 640         if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) >= 0 &&
 641             ci->i_truncate_size != truncate_size) {
 642                 dout("truncate_size %lld -> %llu\n", ci->i_truncate_size,
 643                      truncate_size);
 644                 ci->i_truncate_size = truncate_size;
 645         }
 646
 647         if (queue_trunc)
 648                 ceph_fscache_invalidate(inode);
 649
 650         return queue_trunc;
 651 }
 652
 653 void ceph_fill_file_time(struct inode *inode, int issued,
 654                          u64 time_warp_seq, struct timespec *ctime,
 655                          struct timespec *mtime, struct timespec *atime)
 656 {
 657         struct ceph_inode_info *ci = ceph_inode(inode);
 658         int warn = 0;
 659
 660         if (issued & (CEPH_CAP_FILE_EXCL|
 661                       CEPH_CAP_FILE_WR|
 662                       CEPH_CAP_FILE_BUFFER|
 663                       CEPH_CAP_AUTH_EXCL|
 664                       CEPH_CAP_XATTR_EXCL)) {
 665                 if (timespec_compare(ctime, &inode->i_ctime) > 0) {
 666                         dout("ctime %ld.%09ld -> %ld.%09ld inc w/ cap\n",
 667                              inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
 668                              ctime->tv_sec, ctime->tv_nsec);
 669                         inode->i_ctime = *ctime;
 670                 }
 671                 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) > 0) {
 672                         /* the MDS did a utimes() */
 673                         dout("mtime %ld.%09ld -> %ld.%09ld "
 674                              "tw %d -> %d\n",
 675                              inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
 676                              mtime->tv_sec, mtime->tv_nsec,
 677                              ci->i_time_warp_seq, (int)time_warp_seq);
 678
 679                         inode->i_mtime = *mtime;
 680                         inode->i_atime = *atime;
 681                         ci->i_time_warp_seq = time_warp_seq;
 682                 } else if (time_warp_seq == ci->i_time_warp_seq) {
 683                         /* nobody did utimes(); take the max */
 684                         if (timespec_compare(mtime, &inode->i_mtime) > 0) {
 685                                 dout("mtime %ld.%09ld -> %ld.%09ld inc\n",
 686                                      inode->i_mtime.tv_sec,
 687                                      inode->i_mtime.tv_nsec,
 688                                      mtime->tv_sec, mtime->tv_nsec);
 689                                 inode->i_mtime = *mtime;
 690                         }
 691                         if (timespec_compare(atime, &inode->i_atime) > 0) {
 692                                 dout("atime %ld.%09ld -> %ld.%09ld inc\n",
 693                                      inode->i_atime.tv_sec,
 694                                      inode->i_atime.tv_nsec,
 695                                      atime->tv_sec, atime->tv_nsec);
 696                                 inode->i_atime = *atime;
 697                         }
 698                 } else if (issued & CEPH_CAP_FILE_EXCL) {
 699                         /* we did a utimes(); ignore mds values */
 700                 } else {
 701                         warn = 1;
 702                 }
 703         } else {
 704                 /* we have no write|excl caps; whatever the MDS says is true */
 705                 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) >= 0) {
 706                         inode->i_ctime = *ctime;
 707                         inode->i_mtime = *mtime;
 708                         inode->i_atime = *atime;
 709                         ci->i_time_warp_seq = time_warp_seq;
 710                 } else {
 711                         warn = 1;
 712                 }
 713         }
 714         if (warn) /* time_warp_seq shouldn't go backwards */
 715                 dout("%p mds time_warp_seq %llu < %u\n",
 716                      inode, time_warp_seq, ci->i_time_warp_seq);
 717 }
 718
 719 /*
 720  * Populate an inode based on info from mds.  May be called on new or
 721  * existing inodes.
 722  */
 723 static int fill_inode(struct inode *inode, struct page *locked_page,
 724                       struct ceph_mds_reply_info_in *iinfo,
 725                       struct ceph_mds_reply_dirfrag *dirinfo,
 726                       struct ceph_mds_session *session,
 727                       unsigned long ttl_from, int cap_fmode,
 728                       struct ceph_cap_reservation *caps_reservation)
 729 {
 730         struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
 731         struct ceph_mds_reply_inode *info = iinfo->in;
 732         struct ceph_inode_info *ci = ceph_inode(inode);
 733         int issued = 0, implemented, new_issued;
 734         struct timespec mtime, atime, ctime;
 735         struct ceph_buffer *xattr_blob = NULL;
 736         struct ceph_cap *new_cap = NULL;
 737         int err = 0;
 738         bool wake = false;
 739         bool queue_trunc = false;
 740         bool new_version = false;
 741         bool fill_inline = false;
 742
 743         dout("fill_inode %p ino %llx.%llx v %llu had %llu\n",
 744              inode, ceph_vinop(inode), le64_to_cpu(info->version),
 745              ci->i_version);
 746
 747         /* prealloc new cap struct */
 748         if (info->cap.caps && ceph_snap(inode) == CEPH_NOSNAP)
 749                 new_cap = ceph_get_cap(mdsc, caps_reservation);
 750
 751         /*
 752          * prealloc xattr data, if it looks like we'll need it.  only
 753          * if len > 4 (meaning there are actually xattrs; the first 4
 754          * bytes are the xattr count).
 755          */
 756         if (iinfo->xattr_len > 4) {
 757                 xattr_blob = ceph_buffer_new(iinfo->xattr_len, GFP_NOFS);
 758                 if (!xattr_blob)
 759                         pr_err("fill_inode ENOMEM xattr blob %d bytes\n",
 760                                iinfo->xattr_len);
 761         }
 762
 763         spin_lock(&ci->i_ceph_lock);
 764
 765         /*
 766          * provided version will be odd if inode value is projected,
 767          * even if stable.  skip the update if we have newer stable
 768          * info (ours>=theirs, e.g. due to racing mds replies), unless
 769          * we are getting projected (unstable) info (in which case the
 770          * version is odd, and we want ours>theirs).
 771          *   us   them
 772          *   2    2     skip
 773          *   3    2     skip
 774          *   3    3     update
 775          */
 776         if (ci->i_version == 0 ||
 777             ((info->cap.flags & CEPH_CAP_FLAG_AUTH) &&
 778              le64_to_cpu(info->version) > (ci->i_version & ~1)))
 779                 new_version = true;
 780
 781         issued = __ceph_caps_issued(ci, &implemented);
 782         issued |= implemented | __ceph_caps_dirty(ci);
 783         new_issued = ~issued & le32_to_cpu(info->cap.caps);
 784
 785         /* update inode */
 786         ci->i_version = le64_to_cpu(info->version);
 787         inode->i_version++;
 788         inode->i_rdev = le32_to_cpu(info->rdev);
 789         inode->i_blkbits = fls(le32_to_cpu(info->layout.fl_stripe_unit)) - 1;
 790
 791         if ((new_version || (new_issued & CEPH_CAP_AUTH_SHARED)) &&
 792             (issued & CEPH_CAP_AUTH_EXCL) == 0) {
 793                 inode->i_mode = le32_to_cpu(info->mode);
 794                 inode->i_uid = make_kuid(&init_user_ns, le32_to_cpu(info->uid));
 795                 inode->i_gid = make_kgid(&init_user_ns, le32_to_cpu(info->gid));
 796                 dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode,
 797                      from_kuid(&init_user_ns, inode->i_uid),
 798                      from_kgid(&init_user_ns, inode->i_gid));
 799         }
 800
 801         if ((new_version || (new_issued & CEPH_CAP_LINK_SHARED)) &&
 802             (issued & CEPH_CAP_LINK_EXCL) == 0)
 803                 set_nlink(inode, le32_to_cpu(info->nlink));
 804
 805         if (new_version || (new_issued & CEPH_CAP_ANY_RD)) {
 806                 /* be careful with mtime, atime, size */
 807                 ceph_decode_timespec(&atime, &info->atime);
 808                 ceph_decode_timespec(&mtime, &info->mtime);
 809                 ceph_decode_timespec(&ctime, &info->ctime);
 810                 ceph_fill_file_time(inode, issued,
 811                                 le32_to_cpu(info->time_warp_seq),
 812                                 &ctime, &mtime, &atime);
 813         }
 814
 815         if (new_version ||
 816             (new_issued & (CEPH_CAP_ANY_FILE_RD | CEPH_CAP_ANY_FILE_WR))) {
 817                 if (ci->i_layout.fl_pg_pool != info->layout.fl_pg_pool)
 818                         ci->i_ceph_flags &= ~CEPH_I_POOL_PERM;
 819                 ci->i_layout = info->layout;
 820                 ci->i_pool_ns_len = iinfo->pool_ns_len;
 821
 822                 queue_trunc = ceph_fill_file_size(inode, issued,
 823                                         le32_to_cpu(info->truncate_seq),
 824                                         le64_to_cpu(info->truncate_size),
 825                                         le64_to_cpu(info->size));
 826                 /* only update max_size on auth cap */
 827                 if ((info->cap.flags & CEPH_CAP_FLAG_AUTH) &&
 828                     ci->i_max_size != le64_to_cpu(info->max_size)) {
 829                         dout("max_size %lld -> %llu\n", ci->i_max_size,
 830                                         le64_to_cpu(info->max_size));
 831                         ci->i_max_size = le64_to_cpu(info->max_size);
 832                 }
 833         }
 834
 835         /* xattrs */
 836         /* note that if i_xattrs.len <= 4, i_xattrs.data will still be NULL. */
 837         if ((ci->i_xattrs.version == 0 || !(issued & CEPH_CAP_XATTR_EXCL))  &&
 838             le64_to_cpu(info->xattr_version) > ci->i_xattrs.version) {
 839                 if (ci->i_xattrs.blob)
 840                         ceph_buffer_put(ci->i_xattrs.blob);
 841                 ci->i_xattrs.blob = xattr_blob;
 842                 if (xattr_blob)
 843                         memcpy(ci->i_xattrs.blob->vec.iov_base,
 844                                iinfo->xattr_data, iinfo->xattr_len);
 845                 ci->i_xattrs.version = le64_to_cpu(info->xattr_version);
 846                 ceph_forget_all_cached_acls(inode);
 847                 xattr_blob = NULL;
 848         }
 849
 850         inode->i_mapping->a_ops = &ceph_aops;
 851
 852         switch (inode->i_mode & S_IFMT) {
 853         case S_IFIFO:
 854         case S_IFBLK:
 855         case S_IFCHR:
 856         case S_IFSOCK:
 857                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
 858                 inode->i_op = &ceph_file_iops;
 859                 break;
 860         case S_IFREG:
 861                 inode->i_op = &ceph_file_iops;
 862                 inode->i_fop = &ceph_file_fops;
 863                 break;
 864         case S_IFLNK:
 865                 inode->i_op = &ceph_symlink_iops;
 866                 if (!ci->i_symlink) {
 867                         u32 symlen = iinfo->symlink_len;
 868                         char *sym;
 869
 870                         spin_unlock(&ci->i_ceph_lock);
 871
 872                         if (symlen != i_size_read(inode)) {
 873                                 pr_err("fill_inode %llx.%llx BAD symlink "
 874                                         "size %lld\n", ceph_vinop(inode),
 875                                         i_size_read(inode));
 876                                 i_size_write(inode, symlen);
 877                                 inode->i_blocks = calc_inode_blocks(symlen);
 878                         }
 879
 880                         err = -ENOMEM;
 881                         sym = kstrndup(iinfo->symlink, symlen, GFP_NOFS);
 882                         if (!sym)
 883                                 goto out;
 884
 885                         spin_lock(&ci->i_ceph_lock);
 886                         if (!ci->i_symlink)
 887                                 ci->i_symlink = sym;
 888                         else
 889                                 kfree(sym); /* lost a race */
 890                 }
 891                 inode->i_link = ci->i_symlink;
 892                 break;
 893         case S_IFDIR:
 894                 inode->i_op = &ceph_dir_iops;
 895                 inode->i_fop = &ceph_dir_fops;
 896
 897                 ci->i_dir_layout = iinfo->dir_layout;
 898
 899                 ci->i_files = le64_to_cpu(info->files);
 900                 ci->i_subdirs = le64_to_cpu(info->subdirs);
 901                 ci->i_rbytes = le64_to_cpu(info->rbytes);
 902                 ci->i_rfiles = le64_to_cpu(info->rfiles);
 903                 ci->i_rsubdirs = le64_to_cpu(info->rsubdirs);
 904                 ceph_decode_timespec(&ci->i_rctime, &info->rctime);
 905                 break;
 906         default:
 907                 pr_err("fill_inode %llx.%llx BAD mode 0%o\n",
 908                        ceph_vinop(inode), inode->i_mode);
 909         }
 910
 911         /* were we issued a capability? */
 912         if (info->cap.caps) {
 913                 if (ceph_snap(inode) == CEPH_NOSNAP) {
 914                         unsigned caps = le32_to_cpu(info->cap.caps);
 915                         ceph_add_cap(inode, session,
 916                                      le64_to_cpu(info->cap.cap_id),
 917                                      cap_fmode, caps,
 918                                      le32_to_cpu(info->cap.wanted),
 919                                      le32_to_cpu(info->cap.seq),
 920                                      le32_to_cpu(info->cap.mseq),
 921                                      le64_to_cpu(info->cap.realm),
 922                                      info->cap.flags, &new_cap);
 923
 924                         /* set dir completion flag? */
 925                         if (S_ISDIR(inode->i_mode) &&
 926                             ci->i_files == 0 && ci->i_subdirs == 0 &&
 927                             (caps & CEPH_CAP_FILE_SHARED) &&
 928                             (issued & CEPH_CAP_FILE_EXCL) == 0 &&
 929                             !__ceph_dir_is_complete(ci)) {
 930                                 dout(" marking %p complete (empty)\n", inode);
 931                                 i_size_write(inode, 0);
 932                                 __ceph_dir_set_complete(ci,
 933                                         atomic64_read(&ci->i_release_count),
 934                                         atomic64_read(&ci->i_ordered_count));
 935                         }
 936
 937                         wake = true;
 938                 } else {
 939                         dout(" %p got snap_caps %s\n", inode,
 940                              ceph_cap_string(le32_to_cpu(info->cap.caps)));
 941                         ci->i_snap_caps |= le32_to_cpu(info->cap.caps);
 942                         if (cap_fmode >= 0)
 943                                 __ceph_get_fmode(ci, cap_fmode);
 944                 }
 945         } else if (cap_fmode >= 0) {
 946                 pr_warn("mds issued no caps on %llx.%llx\n",
 947                            ceph_vinop(inode));
 948                 __ceph_get_fmode(ci, cap_fmode);
 949         }
 950
 951         if (iinfo->inline_version > 0 &&
 952             iinfo->inline_version >= ci->i_inline_version) {
 953                 int cache_caps = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO;
 954                 ci->i_inline_version = iinfo->inline_version;
 955                 if (ci->i_inline_version != CEPH_INLINE_NONE &&
 956                     (locked_page ||
 957                      (le32_to_cpu(info->cap.caps) & cache_caps)))
 958                         fill_inline = true;
 959         }
 960
 961         spin_unlock(&ci->i_ceph_lock);
 962
 963         if (fill_inline)
 964                 ceph_fill_inline_data(inode, locked_page,
 965                                       iinfo->inline_data, iinfo->inline_len);
 966
 967         if (wake)
 968                 wake_up_all(&ci->i_cap_wq);
 969
 970         /* queue truncate if we saw i_size decrease */
 971         if (queue_trunc)
 972                 ceph_queue_vmtruncate(inode);
 973
 974         /* populate frag tree */
 975         if (S_ISDIR(inode->i_mode))
 976                 ceph_fill_fragtree(inode, &info->fragtree, dirinfo);
 977
 978         /* update delegation info? */
 979         if (dirinfo)
 980                 ceph_fill_dirfrag(inode, dirinfo);
 981
 982         err = 0;
 983 out:
 984         if (new_cap)
 985                 ceph_put_cap(mdsc, new_cap);
 986         if (xattr_blob)
 987                 ceph_buffer_put(xattr_blob);
 988         return err;
 989 }
 990
 991 /*
 992  * caller should hold session s_mutex.
 993  */
 994 static void update_dentry_lease(struct dentry *dentry,
 995                                 struct ceph_mds_reply_lease *lease,
 996                                 struct ceph_mds_session *session,
 997                                 unsigned long from_time)
 998 {
 999         struct ceph_dentry_info *di = ceph_dentry(dentry);
1000         long unsigned duration = le32_to_cpu(lease->duration_ms);
1001         long unsigned ttl = from_time + (duration * HZ) / 1000;
1002         long unsigned half_ttl = from_time + (duration * HZ / 2) / 1000;
1003         struct inode *dir;
1004
1005         /* only track leases on regular dentries */
1006         if (dentry->d_op != &ceph_dentry_ops)
1007                 return;
1008
1009         spin_lock(&dentry->d_lock);
1010         dout("update_dentry_lease %p duration %lu ms ttl %lu\n",
1011              dentry, duration, ttl);
1012
1013         /* make lease_rdcache_gen match directory */
1014         dir = d_inode(dentry->d_parent);
1015         di->lease_shared_gen = ceph_inode(dir)->i_shared_gen;
1016
1017         if (duration == 0)
1018                 goto out_unlock;
1019
1020         if (di->lease_gen == session->s_cap_gen &&
1021             time_before(ttl, dentry->d_time))
1022                 goto out_unlock;  /* we already have a newer lease. */
1023
1024         if (di->lease_session && di->lease_session != session)
1025                 goto out_unlock;
1026
1027         ceph_dentry_lru_touch(dentry);
1028
1029         if (!di->lease_session)
1030                 di->lease_session = ceph_get_mds_session(session);
1031         di->lease_gen = session->s_cap_gen;
1032         di->lease_seq = le32_to_cpu(lease->seq);
1033         di->lease_renew_after = half_ttl;
1034         di->lease_renew_from = 0;
1035         dentry->d_time = ttl;
1036 out_unlock:
1037         spin_unlock(&dentry->d_lock);
1038         return;
1039 }
1040
1041 /*
1042  * splice a dentry to an inode.
1043  * caller must hold directory i_mutex for this to be safe.
1044  */
1045 static struct dentry *splice_dentry(struct dentry *dn, struct inode *in)
1046 {
1047         struct dentry *realdn;
1048
1049         BUG_ON(d_inode(dn));
1050
1051         /* dn must be unhashed */
1052         if (!d_unhashed(dn))
1053                 d_drop(dn);
1054         realdn = d_splice_alias(in, dn);
1055         if (IS_ERR(realdn)) {
1056                 pr_err("splice_dentry error %ld %p inode %p ino %llx.%llx\n",
1057                        PTR_ERR(realdn), dn, in, ceph_vinop(in));
1058                 dn = realdn; /* note realdn contains the error */
1059                 goto out;
1060         } else if (realdn) {
1061                 dout("dn %p (%d) spliced with %p (%d) "
1062                      "inode %p ino %llx.%llx\n",
1063                      dn, d_count(dn),
1064                      realdn, d_count(realdn),
1065                      d_inode(realdn), ceph_vinop(d_inode(realdn)));
1066                 dput(dn);
1067                 dn = realdn;
1068         } else {
1069                 BUG_ON(!ceph_dentry(dn));
1070                 dout("dn %p attached to %p ino %llx.%llx\n",
1071                      dn, d_inode(dn), ceph_vinop(d_inode(dn)));
1072         }
1073 out:
1074         return dn;
1075 }
1076
1077 /*
1078  * Incorporate results into the local cache.  This is either just
1079  * one inode, or a directory, dentry, and possibly linked-to inode (e.g.,
1080  * after a lookup).
1081  *
1082  * A reply may contain
1083  *         a directory inode along with a dentry.
1084  *  and/or a target inode
1085  *
1086  * Called with snap_rwsem (read).
1087  */
1088 int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req,
1089                     struct ceph_mds_session *session)
1090 {
1091         struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1092         struct inode *in = NULL;
1093         struct ceph_vino vino;
1094         struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
1095         int err = 0;
1096
1097         dout("fill_trace %p is_dentry %d is_target %d\n", req,
1098              rinfo->head->is_dentry, rinfo->head->is_target);
1099
1100 #if 0
1101         /*
1102          * Debugging hook:
1103          *
1104          * If we resend completed ops to a recovering mds, we get no
1105          * trace.  Since that is very rare, pretend this is the case
1106          * to ensure the 'no trace' handlers in the callers behave.
1107          *
1108          * Fill in inodes unconditionally to avoid breaking cap
1109          * invariants.
1110          */
1111         if (rinfo->head->op & CEPH_MDS_OP_WRITE) {
1112                 pr_info("fill_trace faking empty trace on %lld %s\n",
1113                         req->r_tid, ceph_mds_op_name(rinfo->head->op));
1114                 if (rinfo->head->is_dentry) {
1115                         rinfo->head->is_dentry = 0;
1116                         err = fill_inode(req->r_locked_dir,
1117                                          &rinfo->diri, rinfo->dirfrag,
1118                                          session, req->r_request_started, -1);
1119                 }
1120                 if (rinfo->head->is_target) {
1121                         rinfo->head->is_target = 0;
1122                         ininfo = rinfo->targeti.in;
1123                         vino.ino = le64_to_cpu(ininfo->ino);
1124                         vino.snap = le64_to_cpu(ininfo->snapid);
1125                         in = ceph_get_inode(sb, vino);
1126                         err = fill_inode(in, &rinfo->targeti, NULL,
1127                                          session, req->r_request_started,
1128                                          req->r_fmode);
1129                         iput(in);
1130                 }
1131         }
1132 #endif
1133
1134         if (!rinfo->head->is_target && !rinfo->head->is_dentry) {
1135                 dout("fill_trace reply is empty!\n");
1136                 if (rinfo->head->result == 0 && req->r_locked_dir)
1137                         ceph_invalidate_dir_request(req);
1138                 return 0;
1139         }
1140
1141         if (rinfo->head->is_dentry) {
1142                 struct inode *dir = req->r_locked_dir;
1143
1144                 if (dir) {
1145                         err = fill_inode(dir, NULL,
1146                                          &rinfo->diri, rinfo->dirfrag,
1147                                          session, req->r_request_started, -1,
1148                                          &req->r_caps_reservation);
1149                         if (err < 0)
1150                                 goto done;
1151                 } else {
1152                         WARN_ON_ONCE(1);
1153                 }
1154
1155                 if (dir && req->r_op == CEPH_MDS_OP_LOOKUPNAME) {
1156                         struct qstr dname;
1157                         struct dentry *dn, *parent;
1158
1159                         BUG_ON(!rinfo->head->is_target);
1160                         BUG_ON(req->r_dentry);
1161
1162                         parent = d_find_any_alias(dir);
1163                         BUG_ON(!parent);
1164
1165                         dname.name = rinfo->dname;
1166                         dname.len = rinfo->dname_len;
1167                         dname.hash = full_name_hash(parent, dname.name, dname.len);
1168                         vino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1169                         vino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1170 retry_lookup:
1171                         dn = d_lookup(parent, &dname);
1172                         dout("d_lookup on parent=%p name=%.*s got %p\n",
1173                              parent, dname.len, dname.name, dn);
1174
1175                         if (!dn) {
1176                                 dn = d_alloc(parent, &dname);
1177                                 dout("d_alloc %p '%.*s' = %p\n", parent,
1178                                      dname.len, dname.name, dn);
1179                                 if (dn == NULL) {
1180                                         dput(parent);
1181                                         err = -ENOMEM;
1182                                         goto done;
1183                                 }
1184                                 err = ceph_init_dentry(dn);
1185                                 if (err < 0) {
1186                                         dput(dn);
1187                                         dput(parent);
1188                                         goto done;
1189                                 }
1190                         } else if (d_really_is_positive(dn) &&
1191                                    (ceph_ino(d_inode(dn)) != vino.ino ||
1192                                     ceph_snap(d_inode(dn)) != vino.snap)) {
1193                                 dout(" dn %p points to wrong inode %p\n",
1194                                      dn, d_inode(dn));
1195                                 d_delete(dn);
1196                                 dput(dn);
1197                                 goto retry_lookup;
1198                         }
1199
1200                         req->r_dentry = dn;
1201                         dput(parent);
1202                 }
1203         }
1204
1205         if (rinfo->head->is_target) {
1206                 vino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1207                 vino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1208
1209                 in = ceph_get_inode(sb, vino);
1210                 if (IS_ERR(in)) {
1211                         err = PTR_ERR(in);
1212                         goto done;
1213                 }
1214                 req->r_target_inode = in;
1215
1216                 err = fill_inode(in, req->r_locked_page, &rinfo->targeti, NULL,
1217                                 session, req->r_request_started,
1218                                 (!req->r_aborted && rinfo->head->result == 0) ?
1219                                 req->r_fmode : -1,
1220                                 &req->r_caps_reservation);
1221                 if (err < 0) {
1222                         pr_err("fill_inode badness %p %llx.%llx\n",
1223                                 in, ceph_vinop(in));
1224                         goto done;
1225                 }
1226         }
1227
1228         /*
1229          * ignore null lease/binding on snapdir ENOENT, or else we
1230          * will have trouble splicing in the virtual snapdir later
1231          */
1232         if (rinfo->head->is_dentry && !req->r_aborted &&
1233             req->r_locked_dir &&
1234             (rinfo->head->is_target || strncmp(req->r_dentry->d_name.name,
1235                                                fsc->mount_options->snapdir_name,
1236                                                req->r_dentry->d_name.len))) {
1237                 /*
1238                  * lookup link rename   : null -> possibly existing inode
1239                  * mknod symlink mkdir  : null -> new inode
1240                  * unlink               : linked -> null
1241                  */
1242                 struct inode *dir = req->r_locked_dir;
1243                 struct dentry *dn = req->r_dentry;
1244                 bool have_dir_cap, have_lease;
1245
1246                 BUG_ON(!dn);
1247                 BUG_ON(!dir);
1248                 BUG_ON(d_inode(dn->d_parent) != dir);
1249                 BUG_ON(ceph_ino(dir) !=
1250                        le64_to_cpu(rinfo->diri.in->ino));
1251                 BUG_ON(ceph_snap(dir) !=
1252                        le64_to_cpu(rinfo->diri.in->snapid));
1253
1254                 /* do we have a lease on the whole dir? */
1255                 have_dir_cap =
1256                         (le32_to_cpu(rinfo->diri.in->cap.caps) &
1257                          CEPH_CAP_FILE_SHARED);
1258
1259                 /* do we have a dn lease? */
1260                 have_lease = have_dir_cap ||
1261                         le32_to_cpu(rinfo->dlease->duration_ms);
1262                 if (!have_lease)
1263                         dout("fill_trace  no dentry lease or dir cap\n");
1264
1265                 /* rename? */
1266                 if (req->r_old_dentry && req->r_op == CEPH_MDS_OP_RENAME) {
1267                         struct inode *olddir = req->r_old_dentry_dir;
1268                         BUG_ON(!olddir);
1269
1270                         dout(" src %p '%pd' dst %p '%pd'\n",
1271                              req->r_old_dentry,
1272                              req->r_old_dentry,
1273                              dn, dn);
1274                         dout("fill_trace doing d_move %p -> %p\n",
1275                              req->r_old_dentry, dn);
1276
1277                         /* d_move screws up sibling dentries' offsets */
1278                         ceph_dir_clear_ordered(dir);
1279                         ceph_dir_clear_ordered(olddir);
1280
1281                         d_move(req->r_old_dentry, dn);
1282                         dout(" src %p '%pd' dst %p '%pd'\n",
1283                              req->r_old_dentry,
1284                              req->r_old_dentry,
1285                              dn, dn);
1286
1287                         /* ensure target dentry is invalidated, despite
1288                            rehashing bug in vfs_rename_dir */
1289                         ceph_invalidate_dentry_lease(dn);
1290
1291                         dout("dn %p gets new offset %lld\n", req->r_old_dentry,
1292                              ceph_dentry(req->r_old_dentry)->offset);
1293
1294                         dn = req->r_old_dentry;  /* use old_dentry */
1295                 }
1296
1297                 /* null dentry? */
1298                 if (!rinfo->head->is_target) {
1299                         dout("fill_trace null dentry\n");
1300                         if (d_really_is_positive(dn)) {
1301                                 ceph_dir_clear_ordered(dir);
1302                                 dout("d_delete %p\n", dn);
1303                                 d_delete(dn);
1304                         } else {
1305                                 if (have_lease && d_unhashed(dn))
1306                                         d_add(dn, NULL);
1307                                 update_dentry_lease(dn, rinfo->dlease,
1308                                                     session,
1309                                                     req->r_request_started);
1310                         }
1311                         goto done;
1312                 }
1313
1314                 /* attach proper inode */
1315                 if (d_really_is_negative(dn)) {
1316                         ceph_dir_clear_ordered(dir);
1317                         ihold(in);
1318                         dn = splice_dentry(dn, in);
1319                         if (IS_ERR(dn)) {
1320                                 err = PTR_ERR(dn);
1321                                 goto done;
1322                         }
1323                         req->r_dentry = dn;  /* may have spliced */
1324                 } else if (d_really_is_positive(dn) && d_inode(dn) != in) {
1325                         dout(" %p links to %p %llx.%llx, not %llx.%llx\n",
1326                              dn, d_inode(dn), ceph_vinop(d_inode(dn)),
1327                              ceph_vinop(in));
1328                         d_invalidate(dn);
1329                         have_lease = false;
1330                 }
1331
1332                 if (have_lease)
1333                         update_dentry_lease(dn, rinfo->dlease, session,
1334                                             req->r_request_started);
1335                 dout(" final dn %p\n", dn);
1336         } else if (!req->r_aborted &&
1337                    (req->r_op == CEPH_MDS_OP_LOOKUPSNAP ||
1338                     req->r_op == CEPH_MDS_OP_MKSNAP)) {
1339                 struct dentry *dn = req->r_dentry;
1340                 struct inode *dir = req->r_locked_dir;
1341
1342                 /* fill out a snapdir LOOKUPSNAP dentry */
1343                 BUG_ON(!dn);
1344                 BUG_ON(!dir);
1345                 BUG_ON(ceph_snap(dir) != CEPH_SNAPDIR);
1346                 dout(" linking snapped dir %p to dn %p\n", in, dn);
1347                 ceph_dir_clear_ordered(dir);
1348                 ihold(in);
1349                 dn = splice_dentry(dn, in);
1350                 if (IS_ERR(dn)) {
1351                         err = PTR_ERR(dn);
1352                         goto done;
1353                 }
1354                 req->r_dentry = dn;  /* may have spliced */
1355         }
1356 done:
1357         dout("fill_trace done err=%d\n", err);
1358         return err;
1359 }
1360
1361 /*
1362  * Prepopulate our cache with readdir results, leases, etc.
1363  */
1364 static int readdir_prepopulate_inodes_only(struct ceph_mds_request *req,
1365                                            struct ceph_mds_session *session)
1366 {
1367         struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1368         int i, err = 0;
1369
1370         for (i = 0; i < rinfo->dir_nr; i++) {
1371                 struct ceph_mds_reply_dir_entry *rde = rinfo->dir_entries + i;
1372                 struct ceph_vino vino;
1373                 struct inode *in;
1374                 int rc;
1375
1376                 vino.ino = le64_to_cpu(rde->inode.in->ino);
1377                 vino.snap = le64_to_cpu(rde->inode.in->snapid);
1378
1379                 in = ceph_get_inode(req->r_dentry->d_sb, vino);
1380                 if (IS_ERR(in)) {
1381                         err = PTR_ERR(in);
1382                         dout("new_inode badness got %d\n", err);
1383                         continue;
1384                 }
1385                 rc = fill_inode(in, NULL, &rde->inode, NULL, session,
1386                                 req->r_request_started, -1,
1387                                 &req->r_caps_reservation);
1388                 if (rc < 0) {
1389                         pr_err("fill_inode badness on %p got %d\n", in, rc);
1390                         err = rc;
1391                 }
1392                 iput(in);
1393         }
1394
1395         return err;
1396 }
1397
1398 void ceph_readdir_cache_release(struct ceph_readdir_cache_control *ctl)
1399 {
1400         if (ctl->page) {
1401                 kunmap(ctl->page);
1402                 put_page(ctl->page);
1403                 ctl->page = NULL;
1404         }
1405 }
1406
1407 static int fill_readdir_cache(struct inode *dir, struct dentry *dn,
1408                               struct ceph_readdir_cache_control *ctl,
1409                               struct ceph_mds_request *req)
1410 {
1411         struct ceph_inode_info *ci = ceph_inode(dir);
1412         unsigned nsize = PAGE_SIZE / sizeof(struct dentry*);
1413         unsigned idx = ctl->index % nsize;
1414         pgoff_t pgoff = ctl->index / nsize;
1415
1416         if (!ctl->page || pgoff != page_index(ctl->page)) {
1417                 ceph_readdir_cache_release(ctl);
1418                 if (idx == 0)
1419                         ctl->page = grab_cache_page(&dir->i_data, pgoff);
1420                 else
1421                         ctl->page = find_lock_page(&dir->i_data, pgoff);
1422                 if (!ctl->page) {
1423                         ctl->index = -1;
1424                         return idx == 0 ? -ENOMEM : 0;
1425                 }
1426                 /* reading/filling the cache are serialized by
1427                  * i_mutex, no need to use page lock */
1428                 unlock_page(ctl->page);
1429                 ctl->dentries = kmap(ctl->page);
1430                 if (idx == 0)
1431                         memset(ctl->dentries, 0, PAGE_SIZE);
1432         }
1433
1434         if (req->r_dir_release_cnt == atomic64_read(&ci->i_release_count) &&
1435             req->r_dir_ordered_cnt == atomic64_read(&ci->i_ordered_count)) {
1436                 dout("readdir cache dn %p idx %d\n", dn, ctl->index);
1437                 ctl->dentries[idx] = dn;
1438                 ctl->index++;
1439         } else {
1440                 dout("disable readdir cache\n");
1441                 ctl->index = -1;
1442         }
1443         return 0;
1444 }
1445
1446 int ceph_readdir_prepopulate(struct ceph_mds_request *req,
1447                              struct ceph_mds_session *session)
1448 {
1449         struct dentry *parent = req->r_dentry;
1450         struct ceph_inode_info *ci = ceph_inode(d_inode(parent));
1451         struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1452         struct qstr dname;
1453         struct dentry *dn;
1454         struct inode *in;
1455         int err = 0, skipped = 0, ret, i;
1456         struct inode *snapdir = NULL;
1457         struct ceph_mds_request_head *rhead = req->r_request->front.iov_base;
1458         u32 frag = le32_to_cpu(rhead->args.readdir.frag);
1459         u32 last_hash = 0;
1460         u32 fpos_offset;
1461         struct ceph_readdir_cache_control cache_ctl = {};
1462
1463         if (req->r_aborted)
1464                 return readdir_prepopulate_inodes_only(req, session);
1465
1466         if (rinfo->hash_order && req->r_path2) {
1467                 last_hash = ceph_str_hash(ci->i_dir_layout.dl_dir_hash,
1468                                           req->r_path2, strlen(req->r_path2));
1469                 last_hash = ceph_frag_value(last_hash);
1470         }
1471
1472         if (rinfo->dir_dir &&
1473             le32_to_cpu(rinfo->dir_dir->frag) != frag) {
1474                 dout("readdir_prepopulate got new frag %x -> %x\n",
1475                      frag, le32_to_cpu(rinfo->dir_dir->frag));
1476                 frag = le32_to_cpu(rinfo->dir_dir->frag);
1477                 if (!rinfo->hash_order)
1478                         req->r_readdir_offset = 2;
1479         }
1480
1481         if (le32_to_cpu(rinfo->head->op) == CEPH_MDS_OP_LSSNAP) {
1482                 snapdir = ceph_get_snapdir(d_inode(parent));
1483                 parent = d_find_alias(snapdir);
1484                 dout("readdir_prepopulate %d items under SNAPDIR dn %p\n",
1485                      rinfo->dir_nr, parent);
1486         } else {
1487                 dout("readdir_prepopulate %d items under dn %p\n",
1488                      rinfo->dir_nr, parent);
1489                 if (rinfo->dir_dir)
1490                         ceph_fill_dirfrag(d_inode(parent), rinfo->dir_dir);
1491         }
1492
1493         if (ceph_frag_is_leftmost(frag) && req->r_readdir_offset == 2) {
1494                 /* note dir version at start of readdir so we can tell
1495                  * if any dentries get dropped */
1496                 req->r_dir_release_cnt = atomic64_read(&ci->i_release_count);
1497                 req->r_dir_ordered_cnt = atomic64_read(&ci->i_ordered_count);
1498                 req->r_readdir_cache_idx = 0;
1499         }
1500
1501         cache_ctl.index = req->r_readdir_cache_idx;
1502         fpos_offset = req->r_readdir_offset;
1503
1504         /* FIXME: release caps/leases if error occurs */
1505         for (i = 0; i < rinfo->dir_nr; i++) {
1506                 struct ceph_mds_reply_dir_entry *rde = rinfo->dir_entries + i;
1507                 struct ceph_vino vino;
1508
1509                 dname.name = rde->name;
1510                 dname.len = rde->name_len;
1511                 dname.hash = full_name_hash(parent, dname.name, dname.len);
1512
1513                 vino.ino = le64_to_cpu(rde->inode.in->ino);
1514                 vino.snap = le64_to_cpu(rde->inode.in->snapid);
1515
1516                 if (rinfo->hash_order) {
1517                         u32 hash = ceph_str_hash(ci->i_dir_layout.dl_dir_hash,
1518                                                  rde->name, rde->name_len);
1519                         hash = ceph_frag_value(hash);
1520                         if (hash != last_hash)
1521                                 fpos_offset = 2;
1522                         last_hash = hash;
1523                         rde->offset = ceph_make_fpos(hash, fpos_offset++, true);
1524                 } else {
1525                         rde->offset = ceph_make_fpos(frag, fpos_offset++, false);
1526                 }
1527
1528 retry_lookup:
1529                 dn = d_lookup(parent, &dname);
1530                 dout("d_lookup on parent=%p name=%.*s got %p\n",
1531                      parent, dname.len, dname.name, dn);
1532
1533                 if (!dn) {
1534                         dn = d_alloc(parent, &dname);
1535                         dout("d_alloc %p '%.*s' = %p\n", parent,
1536                              dname.len, dname.name, dn);
1537                         if (dn == NULL) {
1538                                 dout("d_alloc badness\n");
1539                                 err = -ENOMEM;
1540                                 goto out;
1541                         }
1542                         ret = ceph_init_dentry(dn);
1543                         if (ret < 0) {
1544                                 dput(dn);
1545                                 err = ret;
1546                                 goto out;
1547                         }
1548                 } else if (d_really_is_positive(dn) &&
1549                            (ceph_ino(d_inode(dn)) != vino.ino ||
1550                             ceph_snap(d_inode(dn)) != vino.snap)) {
1551                         dout(" dn %p points to wrong inode %p\n",
1552                              dn, d_inode(dn));
1553                         d_delete(dn);
1554                         dput(dn);
1555                         goto retry_lookup;
1556                 }
1557
1558                 /* inode */
1559                 if (d_really_is_positive(dn)) {
1560                         in = d_inode(dn);
1561                 } else {
1562                         in = ceph_get_inode(parent->d_sb, vino);
1563                         if (IS_ERR(in)) {
1564                                 dout("new_inode badness\n");
1565                                 d_drop(dn);
1566                                 dput(dn);
1567                                 err = PTR_ERR(in);
1568                                 goto out;
1569                         }
1570                 }
1571
1572                 ret = fill_inode(in, NULL, &rde->inode, NULL, session,
1573                                  req->r_request_started, -1,
1574                                  &req->r_caps_reservation);
1575                 if (ret < 0) {
1576                         pr_err("fill_inode badness on %p\n", in);
1577                         if (d_really_is_negative(dn))
1578                                 iput(in);
1579                         d_drop(dn);
1580                         err = ret;
1581                         goto next_item;
1582                 }
1583
1584                 if (d_really_is_negative(dn)) {
1585                         struct dentry *realdn;
1586
1587                         if (ceph_security_xattr_deadlock(in)) {
1588                                 dout(" skip splicing dn %p to inode %p"
1589                                      " (security xattr deadlock)\n", dn, in);
1590                                 iput(in);
1591                                 skipped++;
1592                                 goto next_item;
1593                         }
1594
1595                         realdn = splice_dentry(dn, in);
1596                         if (IS_ERR(realdn)) {
1597                                 err = PTR_ERR(realdn);
1598                                 d_drop(dn);
1599                                 dn = NULL;
1600                                 goto next_item;
1601                         }
1602                         dn = realdn;
1603                 }
1604
1605                 ceph_dentry(dn)->offset = rde->offset;
1606
1607                 update_dentry_lease(dn, rde->lease, req->r_session,
1608                                     req->r_request_started);
1609
1610                 if (err == 0 && skipped == 0 && cache_ctl.index >= 0) {
1611                         ret = fill_readdir_cache(d_inode(parent), dn,
1612                                                  &cache_ctl, req);
1613                         if (ret < 0)
1614                                 err = ret;
1615                 }
1616 next_item:
1617                 if (dn)
1618                         dput(dn);
1619         }
1620 out:
1621         if (err == 0 && skipped == 0) {
1622                 req->r_did_prepopulate = true;
1623                 req->r_readdir_cache_idx = cache_ctl.index;
1624         }
1625         ceph_readdir_cache_release(&cache_ctl);
1626         if (snapdir) {
1627                 iput(snapdir);
1628                 dput(parent);
1629         }
1630         dout("readdir_prepopulate done\n");
1631         return err;
1632 }
1633
1634 int ceph_inode_set_size(struct inode *inode, loff_t size)
1635 {
1636         struct ceph_inode_info *ci = ceph_inode(inode);
1637         int ret = 0;
1638
1639         spin_lock(&ci->i_ceph_lock);
1640         dout("set_size %p %llu -> %llu\n", inode, inode->i_size, size);
1641         i_size_write(inode, size);
1642         inode->i_blocks = calc_inode_blocks(size);
1643
1644         /* tell the MDS if we are approaching max_size */
1645         if ((size << 1) >= ci->i_max_size &&
1646             (ci->i_reported_size << 1) < ci->i_max_size)
1647                 ret = 1;
1648
1649         spin_unlock(&ci->i_ceph_lock);
1650         return ret;
1651 }
1652
1653 /*
1654  * Write back inode data in a worker thread.  (This can't be done
1655  * in the message handler context.)
1656  */
1657 void ceph_queue_writeback(struct inode *inode)
1658 {
1659         ihold(inode);
1660         if (queue_work(ceph_inode_to_client(inode)->wb_wq,
1661                        &ceph_inode(inode)->i_wb_work)) {
1662                 dout("ceph_queue_writeback %p\n", inode);
1663         } else {
1664                 dout("ceph_queue_writeback %p failed\n", inode);
1665                 iput(inode);
1666         }
1667 }
1668
1669 static void ceph_writeback_work(struct work_struct *work)
1670 {
1671         struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1672                                                   i_wb_work);
1673         struct inode *inode = &ci->vfs_inode;
1674
1675         dout("writeback %p\n", inode);
1676         filemap_fdatawrite(&inode->i_data);
1677         iput(inode);
1678 }
1679
1680 /*
1681  * queue an async invalidation
1682  */
1683 void ceph_queue_invalidate(struct inode *inode)
1684 {
1685         ihold(inode);
1686         if (queue_work(ceph_inode_to_client(inode)->pg_inv_wq,
1687                        &ceph_inode(inode)->i_pg_inv_work)) {
1688                 dout("ceph_queue_invalidate %p\n", inode);
1689         } else {
1690                 dout("ceph_queue_invalidate %p failed\n", inode);
1691                 iput(inode);
1692         }
1693 }
1694
1695 /*
1696  * Invalidate inode pages in a worker thread.  (This can't be done
1697  * in the message handler context.)
1698  */
1699 static void ceph_invalidate_work(struct work_struct *work)
1700 {
1701         struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1702                                                   i_pg_inv_work);
1703         struct inode *inode = &ci->vfs_inode;
1704         struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1705         u32 orig_gen;
1706         int check = 0;
1707
1708         mutex_lock(&ci->i_truncate_mutex);
1709
1710         if (ACCESS_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) {
1711                 pr_warn_ratelimited("invalidate_pages %p %lld forced umount\n",
1712                                     inode, ceph_ino(inode));
1713                 mapping_set_error(inode->i_mapping, -EIO);
1714                 truncate_pagecache(inode, 0);
1715                 mutex_unlock(&ci->i_truncate_mutex);
1716                 goto out;
1717         }
1718
1719         spin_lock(&ci->i_ceph_lock);
1720         dout("invalidate_pages %p gen %d revoking %d\n", inode,
1721              ci->i_rdcache_gen, ci->i_rdcache_revoking);
1722         if (ci->i_rdcache_revoking != ci->i_rdcache_gen) {
1723                 if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE))
1724                         check = 1;
1725                 spin_unlock(&ci->i_ceph_lock);
1726                 mutex_unlock(&ci->i_truncate_mutex);
1727                 goto out;
1728         }
1729         orig_gen = ci->i_rdcache_gen;
1730         spin_unlock(&ci->i_ceph_lock);
1731
1732         if (invalidate_inode_pages2(inode->i_mapping) < 0) {
1733                 pr_err("invalidate_pages %p fails\n", inode);
1734         }
1735
1736         spin_lock(&ci->i_ceph_lock);
1737         if (orig_gen == ci->i_rdcache_gen &&
1738             orig_gen == ci->i_rdcache_revoking) {
1739                 dout("invalidate_pages %p gen %d successful\n", inode,
1740                      ci->i_rdcache_gen);
1741                 ci->i_rdcache_revoking--;
1742                 check = 1;
1743         } else {
1744                 dout("invalidate_pages %p gen %d raced, now %d revoking %d\n",
1745                      inode, orig_gen, ci->i_rdcache_gen,
1746                      ci->i_rdcache_revoking);
1747                 if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE))
1748                         check = 1;
1749         }
1750         spin_unlock(&ci->i_ceph_lock);
1751         mutex_unlock(&ci->i_truncate_mutex);
1752 out:
1753         if (check)
1754                 ceph_check_caps(ci, 0, NULL);
1755         iput(inode);
1756 }
1757
1758
1759 /*
1760  * called by trunc_wq;
1761  *
1762  * We also truncate in a separate thread as well.
1763  */
1764 static void ceph_vmtruncate_work(struct work_struct *work)
1765 {
1766         struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1767                                                   i_vmtruncate_work);
1768         struct inode *inode = &ci->vfs_inode;
1769
1770         dout("vmtruncate_work %p\n", inode);
1771         __ceph_do_pending_vmtruncate(inode);
1772         iput(inode);
1773 }
1774
1775 /*
1776  * Queue an async vmtruncate.  If we fail to queue work, we will handle
1777  * the truncation the next time we call __ceph_do_pending_vmtruncate.
1778  */
1779 void ceph_queue_vmtruncate(struct inode *inode)
1780 {
1781         struct ceph_inode_info *ci = ceph_inode(inode);
1782
1783         ihold(inode);
1784
1785         if (queue_work(ceph_sb_to_client(inode->i_sb)->trunc_wq,
1786                        &ci->i_vmtruncate_work)) {
1787                 dout("ceph_queue_vmtruncate %p\n", inode);
1788         } else {
1789                 dout("ceph_queue_vmtruncate %p failed, pending=%d\n",
1790                      inode, ci->i_truncate_pending);
1791                 iput(inode);
1792         }
1793 }
1794
1795 /*
1796  * Make sure any pending truncation is applied before doing anything
1797  * that may depend on it.
1798  */
1799 void __ceph_do_pending_vmtruncate(struct inode *inode)
1800 {
1801         struct ceph_inode_info *ci = ceph_inode(inode);
1802         u64 to;
1803         int wrbuffer_refs, finish = 0;
1804
1805         mutex_lock(&ci->i_truncate_mutex);
1806 retry:
1807         spin_lock(&ci->i_ceph_lock);
1808         if (ci->i_truncate_pending == 0) {
1809                 dout("__do_pending_vmtruncate %p none pending\n", inode);
1810                 spin_unlock(&ci->i_ceph_lock);
1811                 mutex_unlock(&ci->i_truncate_mutex);
1812                 return;
1813         }
1814
1815         /*
1816          * make sure any dirty snapped pages are flushed before we
1817          * possibly truncate them.. so write AND block!
1818          */
1819         if (ci->i_wrbuffer_ref_head < ci->i_wrbuffer_ref) {
1820                 dout("__do_pending_vmtruncate %p flushing snaps first\n",
1821                      inode);
1822                 spin_unlock(&ci->i_ceph_lock);
1823                 filemap_write_and_wait_range(&inode->i_data, 0,
1824                                              inode->i_sb->s_maxbytes);
1825                 goto retry;
1826         }
1827
1828         /* there should be no reader or writer */
1829         WARN_ON_ONCE(ci->i_rd_ref || ci->i_wr_ref);
1830
1831         to = ci->i_truncate_size;
1832         wrbuffer_refs = ci->i_wrbuffer_ref;
1833         dout("__do_pending_vmtruncate %p (%d) to %lld\n", inode,
1834              ci->i_truncate_pending, to);
1835         spin_unlock(&ci->i_ceph_lock);
1836
1837         truncate_pagecache(inode, to);
1838
1839         spin_lock(&ci->i_ceph_lock);
1840         if (to == ci->i_truncate_size) {
1841                 ci->i_truncate_pending = 0;
1842                 finish = 1;
1843         }
1844         spin_unlock(&ci->i_ceph_lock);
1845         if (!finish)
1846                 goto retry;
1847
1848         mutex_unlock(&ci->i_truncate_mutex);
1849
1850         if (wrbuffer_refs == 0)
1851                 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
1852
1853         wake_up_all(&ci->i_cap_wq);
1854 }
1855
1856 /*
1857  * symlinks
1858  */
1859 static const struct inode_operations ceph_symlink_iops = {
1860         .readlink = generic_readlink,
1861         .get_link = simple_get_link,
1862         .setattr = ceph_setattr,
1863         .getattr = ceph_getattr,
1864         .setxattr = generic_setxattr,
1865         .getxattr = generic_getxattr,
1866         .listxattr = ceph_listxattr,
1867         .removexattr = generic_removexattr,
1868 };
1869
1870 int __ceph_setattr(struct inode *inode, struct iattr *attr)
1871 {
1872         struct ceph_inode_info *ci = ceph_inode(inode);
1873         const unsigned int ia_valid = attr->ia_valid;
1874         struct ceph_mds_request *req;
1875         struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
1876         struct ceph_cap_flush *prealloc_cf;
1877         int issued;
1878         int release = 0, dirtied = 0;
1879         int mask = 0;
1880         int err = 0;
1881         int inode_dirty_flags = 0;
1882         bool lock_snap_rwsem = false;
1883
1884         if (ceph_snap(inode) != CEPH_NOSNAP)
1885                 return -EROFS;
1886
1887         err = inode_change_ok(inode, attr);
1888         if (err != 0)
1889                 return err;
1890
1891         prealloc_cf = ceph_alloc_cap_flush();
1892         if (!prealloc_cf)
1893                 return -ENOMEM;
1894
1895         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETATTR,
1896                                        USE_AUTH_MDS);
1897         if (IS_ERR(req)) {
1898                 ceph_free_cap_flush(prealloc_cf);
1899                 return PTR_ERR(req);
1900         }
1901
1902         spin_lock(&ci->i_ceph_lock);
1903         issued = __ceph_caps_issued(ci, NULL);
1904
1905         if (!ci->i_head_snapc &&
1906             (issued & (CEPH_CAP_ANY_EXCL | CEPH_CAP_FILE_WR))) {
1907                 lock_snap_rwsem = true;
1908                 if (!down_read_trylock(&mdsc->snap_rwsem)) {
1909                         spin_unlock(&ci->i_ceph_lock);
1910                         down_read(&mdsc->snap_rwsem);
1911                         spin_lock(&ci->i_ceph_lock);
1912                         issued = __ceph_caps_issued(ci, NULL);
1913                 }
1914         }
1915
1916         dout("setattr %p issued %s\n", inode, ceph_cap_string(issued));
1917
1918         if (ia_valid & ATTR_UID) {
1919                 dout("setattr %p uid %d -> %d\n", inode,
1920                      from_kuid(&init_user_ns, inode->i_uid),
1921                      from_kuid(&init_user_ns, attr->ia_uid));
1922                 if (issued & CEPH_CAP_AUTH_EXCL) {
1923                         inode->i_uid = attr->ia_uid;
1924                         dirtied |= CEPH_CAP_AUTH_EXCL;
1925                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1926                            !uid_eq(attr->ia_uid, inode->i_uid)) {
1927                         req->r_args.setattr.uid = cpu_to_le32(
1928                                 from_kuid(&init_user_ns, attr->ia_uid));
1929                         mask |= CEPH_SETATTR_UID;
1930                         release |= CEPH_CAP_AUTH_SHARED;
1931                 }
1932         }
1933         if (ia_valid & ATTR_GID) {
1934                 dout("setattr %p gid %d -> %d\n", inode,
1935                      from_kgid(&init_user_ns, inode->i_gid),
1936                      from_kgid(&init_user_ns, attr->ia_gid));
1937                 if (issued & CEPH_CAP_AUTH_EXCL) {
1938                         inode->i_gid = attr->ia_gid;
1939                         dirtied |= CEPH_CAP_AUTH_EXCL;
1940                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1941                            !gid_eq(attr->ia_gid, inode->i_gid)) {
1942                         req->r_args.setattr.gid = cpu_to_le32(
1943                                 from_kgid(&init_user_ns, attr->ia_gid));
1944                         mask |= CEPH_SETATTR_GID;
1945                         release |= CEPH_CAP_AUTH_SHARED;
1946                 }
1947         }
1948         if (ia_valid & ATTR_MODE) {
1949                 dout("setattr %p mode 0%o -> 0%o\n", inode, inode->i_mode,
1950                      attr->ia_mode);
1951                 if (issued & CEPH_CAP_AUTH_EXCL) {
1952                         inode->i_mode = attr->ia_mode;
1953                         dirtied |= CEPH_CAP_AUTH_EXCL;
1954                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1955                            attr->ia_mode != inode->i_mode) {
1956                         inode->i_mode = attr->ia_mode;
1957                         req->r_args.setattr.mode = cpu_to_le32(attr->ia_mode);
1958                         mask |= CEPH_SETATTR_MODE;
1959                         release |= CEPH_CAP_AUTH_SHARED;
1960                 }
1961         }
1962
1963         if (ia_valid & ATTR_ATIME) {
1964                 dout("setattr %p atime %ld.%ld -> %ld.%ld\n", inode,
1965                      inode->i_atime.tv_sec, inode->i_atime.tv_nsec,
1966                      attr->ia_atime.tv_sec, attr->ia_atime.tv_nsec);
1967                 if (issued & CEPH_CAP_FILE_EXCL) {
1968                         ci->i_time_warp_seq++;
1969                         inode->i_atime = attr->ia_atime;
1970                         dirtied |= CEPH_CAP_FILE_EXCL;
1971                 } else if ((issued & CEPH_CAP_FILE_WR) &&
1972                            timespec_compare(&inode->i_atime,
1973                                             &attr->ia_atime) < 0) {
1974                         inode->i_atime = attr->ia_atime;
1975                         dirtied |= CEPH_CAP_FILE_WR;
1976                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1977                            !timespec_equal(&inode->i_atime, &attr->ia_atime)) {
1978                         ceph_encode_timespec(&req->r_args.setattr.atime,
1979                                              &attr->ia_atime);
1980                         mask |= CEPH_SETATTR_ATIME;
1981                         release |= CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_RD |
1982                                 CEPH_CAP_FILE_WR;
1983                 }
1984         }
1985         if (ia_valid & ATTR_MTIME) {
1986                 dout("setattr %p mtime %ld.%ld -> %ld.%ld\n", inode,
1987                      inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
1988                      attr->ia_mtime.tv_sec, attr->ia_mtime.tv_nsec);
1989                 if (issued & CEPH_CAP_FILE_EXCL) {
1990                         ci->i_time_warp_seq++;
1991                         inode->i_mtime = attr->ia_mtime;
1992                         dirtied |= CEPH_CAP_FILE_EXCL;
1993                 } else if ((issued & CEPH_CAP_FILE_WR) &&
1994                            timespec_compare(&inode->i_mtime,
1995                                             &attr->ia_mtime) < 0) {
1996                         inode->i_mtime = attr->ia_mtime;
1997                         dirtied |= CEPH_CAP_FILE_WR;
1998                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1999                            !timespec_equal(&inode->i_mtime, &attr->ia_mtime)) {
2000                         ceph_encode_timespec(&req->r_args.setattr.mtime,
2001                                              &attr->ia_mtime);
2002                         mask |= CEPH_SETATTR_MTIME;
2003                         release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD |
2004                                 CEPH_CAP_FILE_WR;
2005                 }
2006         }
2007         if (ia_valid & ATTR_SIZE) {
2008                 dout("setattr %p size %lld -> %lld\n", inode,
2009                      inode->i_size, attr->ia_size);
2010                 if ((issued & CEPH_CAP_FILE_EXCL) &&
2011                     attr->ia_size > inode->i_size) {
2012                         i_size_write(inode, attr->ia_size);
2013                         inode->i_blocks = calc_inode_blocks(attr->ia_size);
2014                         inode->i_ctime = attr->ia_ctime;
2015                         ci->i_reported_size = attr->ia_size;
2016                         dirtied |= CEPH_CAP_FILE_EXCL;
2017                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
2018                            attr->ia_size != inode->i_size) {
2019                         req->r_args.setattr.size = cpu_to_le64(attr->ia_size);
2020                         req->r_args.setattr.old_size =
2021                                 cpu_to_le64(inode->i_size);
2022                         mask |= CEPH_SETATTR_SIZE;
2023                         release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD |
2024                                 CEPH_CAP_FILE_WR;
2025                 }
2026         }
2027
2028         /* these do nothing */
2029         if (ia_valid & ATTR_CTIME) {
2030                 bool only = (ia_valid & (ATTR_SIZE|ATTR_MTIME|ATTR_ATIME|
2031                                          ATTR_MODE|ATTR_UID|ATTR_GID)) == 0;
2032                 dout("setattr %p ctime %ld.%ld -> %ld.%ld (%s)\n", inode,
2033                      inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
2034                      attr->ia_ctime.tv_sec, attr->ia_ctime.tv_nsec,
2035                      only ? "ctime only" : "ignored");
2036                 inode->i_ctime = attr->ia_ctime;
2037                 if (only) {
2038                         /*
2039                          * if kernel wants to dirty ctime but nothing else,
2040                          * we need to choose a cap to dirty under, or do
2041                          * a almost-no-op setattr
2042                          */
2043                         if (issued & CEPH_CAP_AUTH_EXCL)
2044                                 dirtied |= CEPH_CAP_AUTH_EXCL;
2045                         else if (issued & CEPH_CAP_FILE_EXCL)
2046                                 dirtied |= CEPH_CAP_FILE_EXCL;
2047                         else if (issued & CEPH_CAP_XATTR_EXCL)
2048                                 dirtied |= CEPH_CAP_XATTR_EXCL;
2049                         else
2050                                 mask |= CEPH_SETATTR_CTIME;
2051                 }
2052         }
2053         if (ia_valid & ATTR_FILE)
2054                 dout("setattr %p ATTR_FILE ... hrm!\n", inode);
2055
2056         if (dirtied) {
2057                 inode_dirty_flags = __ceph_mark_dirty_caps(ci, dirtied,
2058                                                            &prealloc_cf);
2059                 inode->i_ctime = current_fs_time(inode->i_sb);
2060         }
2061
2062         release &= issued;
2063         spin_unlock(&ci->i_ceph_lock);
2064         if (lock_snap_rwsem)
2065                 up_read(&mdsc->snap_rwsem);
2066
2067         if (inode_dirty_flags)
2068                 __mark_inode_dirty(inode, inode_dirty_flags);
2069
2070         if (ia_valid & ATTR_MODE) {
2071                 err = posix_acl_chmod(inode, attr->ia_mode);
2072                 if (err)
2073                         goto out_put;
2074         }
2075
2076         if (mask) {
2077                 req->r_inode = inode;
2078                 ihold(inode);
2079                 req->r_inode_drop = release;
2080                 req->r_args.setattr.mask = cpu_to_le32(mask);
2081                 req->r_num_caps = 1;
2082                 err = ceph_mdsc_do_request(mdsc, NULL, req);
2083         }
2084         dout("setattr %p result=%d (%s locally, %d remote)\n", inode, err,
2085              ceph_cap_string(dirtied), mask);
2086
2087         ceph_mdsc_put_request(req);
2088         if (mask & CEPH_SETATTR_SIZE)
2089                 __ceph_do_pending_vmtruncate(inode);
2090         ceph_free_cap_flush(prealloc_cf);
2091         return err;
2092 out_put:
2093         ceph_mdsc_put_request(req);
2094         ceph_free_cap_flush(prealloc_cf);
2095         return err;
2096 }
2097
2098 /*
2099  * setattr
2100  */
2101 int ceph_setattr(struct dentry *dentry, struct iattr *attr)
2102 {
2103         return __ceph_setattr(d_inode(dentry), attr);
2104 }
2105
2106 /*
2107  * Verify that we have a lease on the given mask.  If not,
2108  * do a getattr against an mds.
2109  */
2110 int __ceph_do_getattr(struct inode *inode, struct page *locked_page,
2111                       int mask, bool force)
2112 {
2113         struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
2114         struct ceph_mds_client *mdsc = fsc->mdsc;
2115         struct ceph_mds_request *req;
2116         int err;
2117
2118         if (ceph_snap(inode) == CEPH_SNAPDIR) {
2119                 dout("do_getattr inode %p SNAPDIR\n", inode);
2120                 return 0;
2121         }
2122
2123         dout("do_getattr inode %p mask %s mode 0%o\n",
2124              inode, ceph_cap_string(mask), inode->i_mode);
2125         if (!force && ceph_caps_issued_mask(ceph_inode(inode), mask, 1))
2126                 return 0;
2127
2128         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
2129         if (IS_ERR(req))
2130                 return PTR_ERR(req);
2131         req->r_inode = inode;
2132         ihold(inode);
2133         req->r_num_caps = 1;
2134         req->r_args.getattr.mask = cpu_to_le32(mask);
2135         req->r_locked_page = locked_page;
2136         err = ceph_mdsc_do_request(mdsc, NULL, req);
2137         if (locked_page && err == 0) {
2138                 u64 inline_version = req->r_reply_info.targeti.inline_version;
2139                 if (inline_version == 0) {
2140                         /* the reply is supposed to contain inline data */
2141                         err = -EINVAL;
2142                 } else if (inline_version == CEPH_INLINE_NONE) {
2143                         err = -ENODATA;
2144                 } else {
2145                         err = req->r_reply_info.targeti.inline_len;
2146                 }
2147         }
2148         ceph_mdsc_put_request(req);
2149         dout("do_getattr result=%d\n", err);
2150         return err;
2151 }
2152
2153
2154 /*
2155  * Check inode permissions.  We verify we have a valid value for
2156  * the AUTH cap, then call the generic handler.
2157  */
2158 int ceph_permission(struct inode *inode, int mask)
2159 {
2160         int err;
2161
2162         if (mask & MAY_NOT_BLOCK)
2163                 return -ECHILD;
2164
2165         err = ceph_do_getattr(inode, CEPH_CAP_AUTH_SHARED, false);
2166
2167         if (!err)
2168                 err = generic_permission(inode, mask);
2169         return err;
2170 }
2171
2172 /*
2173  * Get all attributes.  Hopefully somedata we'll have a statlite()
2174  * and can limit the fields we require to be accurate.
2175  */
2176 int ceph_getattr(struct vfsmount *mnt, struct dentry *dentry,
2177                  struct kstat *stat)
2178 {
2179         struct inode *inode = d_inode(dentry);
2180         struct ceph_inode_info *ci = ceph_inode(inode);
2181         int err;
2182
2183         err = ceph_do_getattr(inode, CEPH_STAT_CAP_INODE_ALL, false);
2184         if (!err) {
2185                 generic_fillattr(inode, stat);
2186                 stat->ino = ceph_translate_ino(inode->i_sb, inode->i_ino);
2187                 if (ceph_snap(inode) != CEPH_NOSNAP)
2188                         stat->dev = ceph_snap(inode);
2189                 else
2190                         stat->dev = 0;
2191                 if (S_ISDIR(inode->i_mode)) {
2192                         if (ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb),
2193                                                 RBYTES))
2194                                 stat->size = ci->i_rbytes;
2195                         else
2196                                 stat->size = ci->i_files + ci->i_subdirs;
2197                         stat->blocks = 0;
2198                         stat->blksize = 65536;
2199                 }
2200         }
2201         return err;
2202 }