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