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/namei.h>
  10 #include <linux/writeback.h>
  11 #include <linux/vmalloc.h>
  12 #include <linux/pagevec.h>
  13
  14 #include "super.h"
  15 #include "mds_client.h"
  16 #include <linux/ceph/decode.h>
  17
  18 /*
  19  * Ceph inode operations
  20  *
  21  * Implement basic inode helpers (get, alloc) and inode ops (getattr,
  22  * setattr, etc.), xattr helpers, and helpers for assimilating
  23  * metadata returned by the MDS into our cache.
  24  *
  25  * Also define helpers for doing asynchronous writeback, invalidation,
  26  * and truncation for the benefit of those who can't afford to block
  27  * (typically because they are in the message handler path).
  28  */
  29
  30 static const struct inode_operations ceph_symlink_iops;
  31
  32 static void ceph_invalidate_work(struct work_struct *work);
  33 static void ceph_writeback_work(struct work_struct *work);
  34 static void ceph_vmtruncate_work(struct work_struct *work);
  35
  36 /*
  37  * find or create an inode, given the ceph ino number
  38  */
  39 static int ceph_set_ino_cb(struct inode *inode, void *data)
  40 {
  41         ceph_inode(inode)->i_vino = *(struct ceph_vino *)data;
  42         inode->i_ino = ceph_vino_to_ino(*(struct ceph_vino *)data);
  43         return 0;
  44 }
  45
  46 struct inode *ceph_get_inode(struct super_block *sb, struct ceph_vino vino)
  47 {
  48         struct inode *inode;
  49         ino_t t = ceph_vino_to_ino(vino);
  50
  51         inode = iget5_locked(sb, t, ceph_ino_compare, ceph_set_ino_cb, &vino);
  52         if (inode == NULL)
  53                 return ERR_PTR(-ENOMEM);
  54         if (inode->i_state & I_NEW) {
  55                 dout("get_inode created new inode %p %llx.%llx ino %llx\n",
  56                      inode, ceph_vinop(inode), (u64)inode->i_ino);
  57                 unlock_new_inode(inode);
  58         }
  59
  60         dout("get_inode on %lu=%llx.%llx got %p\n", inode->i_ino, vino.ino,
  61              vino.snap, inode);
  62         return inode;
  63 }
  64
  65 /*
  66  * get/constuct snapdir inode for a given directory
  67  */
  68 struct inode *ceph_get_snapdir(struct inode *parent)
  69 {
  70         struct ceph_vino vino = {
  71                 .ino = ceph_ino(parent),
  72                 .snap = CEPH_SNAPDIR,
  73         };
  74         struct inode *inode = ceph_get_inode(parent->i_sb, vino);
  75         struct ceph_inode_info *ci = ceph_inode(inode);
  76
  77         BUG_ON(!S_ISDIR(parent->i_mode));
  78         if (IS_ERR(inode))
  79                 return inode;
  80         inode->i_mode = parent->i_mode;
  81         inode->i_uid = parent->i_uid;
  82         inode->i_gid = parent->i_gid;
  83         inode->i_op = &ceph_dir_iops;
  84         inode->i_fop = &ceph_dir_fops;
  85         ci->i_snap_caps = CEPH_CAP_PIN; /* so we can open */
  86         ci->i_rbytes = 0;
  87         return inode;
  88 }
  89
  90 const struct inode_operations ceph_file_iops = {
  91         .permission = ceph_permission,
  92         .setattr = ceph_setattr,
  93         .getattr = ceph_getattr,
  94         .setxattr = ceph_setxattr,
  95         .getxattr = ceph_getxattr,
  96         .listxattr = ceph_listxattr,
  97         .removexattr = ceph_removexattr,
  98 };
  99
 100
 101 /*
 102  * We use a 'frag tree' to keep track of the MDS's directory fragments
 103  * for a given inode (usually there is just a single fragment).  We
 104  * need to know when a child frag is delegated to a new MDS, or when
 105  * it is flagged as replicated, so we can direct our requests
 106  * accordingly.
 107  */
 108
 109 /*
 110  * find/create a frag in the tree
 111  */
 112 static struct ceph_inode_frag *__get_or_create_frag(struct ceph_inode_info *ci,
 113                                                     u32 f)
 114 {
 115         struct rb_node **p;
 116         struct rb_node *parent = NULL;
 117         struct ceph_inode_frag *frag;
 118         int c;
 119
 120         p = &ci->i_fragtree.rb_node;
 121         while (*p) {
 122                 parent = *p;
 123                 frag = rb_entry(parent, struct ceph_inode_frag, node);
 124                 c = ceph_frag_compare(f, frag->frag);
 125                 if (c < 0)
 126                         p = &(*p)->rb_left;
 127                 else if (c > 0)
 128                         p = &(*p)->rb_right;
 129                 else
 130                         return frag;
 131         }
 132
 133         frag = kmalloc(sizeof(*frag), GFP_NOFS);
 134         if (!frag) {
 135                 pr_err("__get_or_create_frag ENOMEM on %p %llx.%llx "
 136                        "frag %x\n", &ci->vfs_inode,
 137                        ceph_vinop(&ci->vfs_inode), f);
 138                 return ERR_PTR(-ENOMEM);
 139         }
 140         frag->frag = f;
 141         frag->split_by = 0;
 142         frag->mds = -1;
 143         frag->ndist = 0;
 144
 145         rb_link_node(&frag->node, parent, p);
 146         rb_insert_color(&frag->node, &ci->i_fragtree);
 147
 148         dout("get_or_create_frag added %llx.%llx frag %x\n",
 149              ceph_vinop(&ci->vfs_inode), f);
 150         return frag;
 151 }
 152
 153 /*
 154  * find a specific frag @f
 155  */
 156 struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci, u32 f)
 157 {
 158         struct rb_node *n = ci->i_fragtree.rb_node;
 159
 160         while (n) {
 161                 struct ceph_inode_frag *frag =
 162                         rb_entry(n, struct ceph_inode_frag, node);
 163                 int c = ceph_frag_compare(f, frag->frag);
 164                 if (c < 0)
 165                         n = n->rb_left;
 166                 else if (c > 0)
 167                         n = n->rb_right;
 168                 else
 169                         return frag;
 170         }
 171         return NULL;
 172 }
 173
 174 /*
 175  * Choose frag containing the given value @v.  If @pfrag is
 176  * specified, copy the frag delegation info to the caller if
 177  * it is present.
 178  */
 179 u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
 180                      struct ceph_inode_frag *pfrag,
 181                      int *found)
 182 {
 183         u32 t = ceph_frag_make(0, 0);
 184         struct ceph_inode_frag *frag;
 185         unsigned nway, i;
 186         u32 n;
 187
 188         if (found)
 189                 *found = 0;
 190
 191         mutex_lock(&ci->i_fragtree_mutex);
 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         mutex_unlock(&ci->i_fragtree_mutex);
 221         return t;
 222 }
 223
 224 /*
 225  * Process dirfrag (delegation) info from the mds.  Include leaf
 226  * fragment in tree ONLY if ndist > 0.  Otherwise, only
 227  * branches/splits are included in i_fragtree)
 228  */
 229 static int ceph_fill_dirfrag(struct inode *inode,
 230                              struct ceph_mds_reply_dirfrag *dirinfo)
 231 {
 232         struct ceph_inode_info *ci = ceph_inode(inode);
 233         struct ceph_inode_frag *frag;
 234         u32 id = le32_to_cpu(dirinfo->frag);
 235         int mds = le32_to_cpu(dirinfo->auth);
 236         int ndist = le32_to_cpu(dirinfo->ndist);
 237         int i;
 238         int err = 0;
 239
 240         mutex_lock(&ci->i_fragtree_mutex);
 241         if (ndist == 0) {
 242                 /* no delegation info needed. */
 243                 frag = __ceph_find_frag(ci, id);
 244                 if (!frag)
 245                         goto out;
 246                 if (frag->split_by == 0) {
 247                         /* tree leaf, remove */
 248                         dout("fill_dirfrag removed %llx.%llx frag %x"
 249                              " (no ref)\n", ceph_vinop(inode), id);
 250                         rb_erase(&frag->node, &ci->i_fragtree);
 251                         kfree(frag);
 252                 } else {
 253                         /* tree branch, keep and clear */
 254                         dout("fill_dirfrag cleared %llx.%llx frag %x"
 255                              " referral\n", ceph_vinop(inode), id);
 256                         frag->mds = -1;
 257                         frag->ndist = 0;
 258                 }
 259                 goto out;
 260         }
 261
 262
 263         /* find/add this frag to store mds delegation info */
 264         frag = __get_or_create_frag(ci, id);
 265         if (IS_ERR(frag)) {
 266                 /* this is not the end of the world; we can continue
 267                    with bad/inaccurate delegation info */
 268                 pr_err("fill_dirfrag ENOMEM on mds ref %llx.%llx fg %x\n",
 269                        ceph_vinop(inode), le32_to_cpu(dirinfo->frag));
 270                 err = -ENOMEM;
 271                 goto out;
 272         }
 273
 274         frag->mds = mds;
 275         frag->ndist = min_t(u32, ndist, CEPH_MAX_DIRFRAG_REP);
 276         for (i = 0; i < frag->ndist; i++)
 277                 frag->dist[i] = le32_to_cpu(dirinfo->dist[i]);
 278         dout("fill_dirfrag %llx.%llx frag %x ndist=%d\n",
 279              ceph_vinop(inode), frag->frag, frag->ndist);
 280
 281 out:
 282         mutex_unlock(&ci->i_fragtree_mutex);
 283         return err;
 284 }
 285
 286
 287 /*
 288  * initialize a newly allocated inode.
 289  */
 290 struct inode *ceph_alloc_inode(struct super_block *sb)
 291 {
 292         struct ceph_inode_info *ci;
 293         int i;
 294
 295         ci = kmem_cache_alloc(ceph_inode_cachep, GFP_NOFS);
 296         if (!ci)
 297                 return NULL;
 298
 299         dout("alloc_inode %p\n", &ci->vfs_inode);
 300
 301         ci->i_version = 0;
 302         ci->i_time_warp_seq = 0;
 303         ci->i_ceph_flags = 0;
 304         ci->i_release_count = 0;
 305         ci->i_symlink = NULL;
 306
 307         memset(&ci->i_dir_layout, 0, sizeof(ci->i_dir_layout));
 308
 309         ci->i_fragtree = RB_ROOT;
 310         mutex_init(&ci->i_fragtree_mutex);
 311
 312         ci->i_xattrs.blob = NULL;
 313         ci->i_xattrs.prealloc_blob = NULL;
 314         ci->i_xattrs.dirty = false;
 315         ci->i_xattrs.index = RB_ROOT;
 316         ci->i_xattrs.count = 0;
 317         ci->i_xattrs.names_size = 0;
 318         ci->i_xattrs.vals_size = 0;
 319         ci->i_xattrs.version = 0;
 320         ci->i_xattrs.index_version = 0;
 321
 322         ci->i_caps = RB_ROOT;
 323         ci->i_auth_cap = NULL;
 324         ci->i_dirty_caps = 0;
 325         ci->i_flushing_caps = 0;
 326         INIT_LIST_HEAD(&ci->i_dirty_item);
 327         INIT_LIST_HEAD(&ci->i_flushing_item);
 328         ci->i_cap_flush_seq = 0;
 329         ci->i_cap_flush_last_tid = 0;
 330         memset(&ci->i_cap_flush_tid, 0, sizeof(ci->i_cap_flush_tid));
 331         init_waitqueue_head(&ci->i_cap_wq);
 332         ci->i_hold_caps_min = 0;
 333         ci->i_hold_caps_max = 0;
 334         INIT_LIST_HEAD(&ci->i_cap_delay_list);
 335         ci->i_cap_exporting_mds = 0;
 336         ci->i_cap_exporting_mseq = 0;
 337         ci->i_cap_exporting_issued = 0;
 338         INIT_LIST_HEAD(&ci->i_cap_snaps);
 339         ci->i_head_snapc = NULL;
 340         ci->i_snap_caps = 0;
 341
 342         for (i = 0; i < CEPH_FILE_MODE_NUM; i++)
 343                 ci->i_nr_by_mode[i] = 0;
 344
 345         ci->i_truncate_seq = 0;
 346         ci->i_truncate_size = 0;
 347         ci->i_truncate_pending = 0;
 348
 349         ci->i_max_size = 0;
 350         ci->i_reported_size = 0;
 351         ci->i_wanted_max_size = 0;
 352         ci->i_requested_max_size = 0;
 353
 354         ci->i_pin_ref = 0;
 355         ci->i_rd_ref = 0;
 356         ci->i_rdcache_ref = 0;
 357         ci->i_wr_ref = 0;
 358         ci->i_wb_ref = 0;
 359         ci->i_wrbuffer_ref = 0;
 360         ci->i_wrbuffer_ref_head = 0;
 361         ci->i_shared_gen = 0;
 362         ci->i_rdcache_gen = 0;
 363         ci->i_rdcache_revoking = 0;
 364
 365         INIT_LIST_HEAD(&ci->i_unsafe_writes);
 366         INIT_LIST_HEAD(&ci->i_unsafe_dirops);
 367         spin_lock_init(&ci->i_unsafe_lock);
 368
 369         ci->i_snap_realm = NULL;
 370         INIT_LIST_HEAD(&ci->i_snap_realm_item);
 371         INIT_LIST_HEAD(&ci->i_snap_flush_item);
 372
 373         INIT_WORK(&ci->i_wb_work, ceph_writeback_work);
 374         INIT_WORK(&ci->i_pg_inv_work, ceph_invalidate_work);
 375
 376         INIT_WORK(&ci->i_vmtruncate_work, ceph_vmtruncate_work);
 377
 378         return &ci->vfs_inode;
 379 }
 380
 381 static void ceph_i_callback(struct rcu_head *head)
 382 {
 383         struct inode *inode = container_of(head, struct inode, i_rcu);
 384         struct ceph_inode_info *ci = ceph_inode(inode);
 385
 386         INIT_LIST_HEAD(&inode->i_dentry);
 387         kmem_cache_free(ceph_inode_cachep, ci);
 388 }
 389
 390 void ceph_destroy_inode(struct inode *inode)
 391 {
 392         struct ceph_inode_info *ci = ceph_inode(inode);
 393         struct ceph_inode_frag *frag;
 394         struct rb_node *n;
 395
 396         dout("destroy_inode %p ino %llx.%llx\n", inode, ceph_vinop(inode));
 397
 398         ceph_queue_caps_release(inode);
 399
 400         /*
 401          * we may still have a snap_realm reference if there are stray
 402          * caps in i_cap_exporting_issued or i_snap_caps.
 403          */
 404         if (ci->i_snap_realm) {
 405                 struct ceph_mds_client *mdsc =
 406                         ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc;
 407                 struct ceph_snap_realm *realm = ci->i_snap_realm;
 408
 409                 dout(" dropping residual ref to snap realm %p\n", realm);
 410                 spin_lock(&realm->inodes_with_caps_lock);
 411                 list_del_init(&ci->i_snap_realm_item);
 412                 spin_unlock(&realm->inodes_with_caps_lock);
 413                 ceph_put_snap_realm(mdsc, realm);
 414         }
 415
 416         kfree(ci->i_symlink);
 417         while ((n = rb_first(&ci->i_fragtree)) != NULL) {
 418                 frag = rb_entry(n, struct ceph_inode_frag, node);
 419                 rb_erase(n, &ci->i_fragtree);
 420                 kfree(frag);
 421         }
 422
 423         __ceph_destroy_xattrs(ci);
 424         if (ci->i_xattrs.blob)
 425                 ceph_buffer_put(ci->i_xattrs.blob);
 426         if (ci->i_xattrs.prealloc_blob)
 427                 ceph_buffer_put(ci->i_xattrs.prealloc_blob);
 428
 429         call_rcu(&inode->i_rcu, ceph_i_callback);
 430 }
 431
 432
 433 /*
 434  * Helpers to fill in size, ctime, mtime, and atime.  We have to be
 435  * careful because either the client or MDS may have more up to date
 436  * info, depending on which capabilities are held, and whether
 437  * time_warp_seq or truncate_seq have increased.  (Ordinarily, mtime
 438  * and size are monotonically increasing, except when utimes() or
 439  * truncate() increments the corresponding _seq values.)
 440  */
 441 int ceph_fill_file_size(struct inode *inode, int issued,
 442                         u32 truncate_seq, u64 truncate_size, u64 size)
 443 {
 444         struct ceph_inode_info *ci = ceph_inode(inode);
 445         int queue_trunc = 0;
 446
 447         if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) > 0 ||
 448             (truncate_seq == ci->i_truncate_seq && size > inode->i_size)) {
 449                 dout("size %lld -> %llu\n", inode->i_size, size);
 450                 inode->i_size = size;
 451                 inode->i_blocks = (size + (1<<9) - 1) >> 9;
 452                 ci->i_reported_size = size;
 453                 if (truncate_seq != ci->i_truncate_seq) {
 454                         dout("truncate_seq %u -> %u\n",
 455                              ci->i_truncate_seq, truncate_seq);
 456                         ci->i_truncate_seq = truncate_seq;
 457                         /*
 458                          * If we hold relevant caps, or in the case where we're
 459                          * not the only client referencing this file and we
 460                          * don't hold those caps, then we need to check whether
 461                          * the file is either opened or mmaped
 462                          */
 463                         if ((issued & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_RD|
 464                                        CEPH_CAP_FILE_WR|CEPH_CAP_FILE_BUFFER|
 465                                        CEPH_CAP_FILE_EXCL|
 466                                        CEPH_CAP_FILE_LAZYIO)) ||
 467                             mapping_mapped(inode->i_mapping) ||
 468                             __ceph_caps_file_wanted(ci)) {
 469                                 ci->i_truncate_pending++;
 470                                 queue_trunc = 1;
 471                         }
 472                 }
 473         }
 474         if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) >= 0 &&
 475             ci->i_truncate_size != truncate_size) {
 476                 dout("truncate_size %lld -> %llu\n", ci->i_truncate_size,
 477                      truncate_size);
 478                 ci->i_truncate_size = truncate_size;
 479         }
 480         return queue_trunc;
 481 }
 482
 483 void ceph_fill_file_time(struct inode *inode, int issued,
 484                          u64 time_warp_seq, struct timespec *ctime,
 485                          struct timespec *mtime, struct timespec *atime)
 486 {
 487         struct ceph_inode_info *ci = ceph_inode(inode);
 488         int warn = 0;
 489
 490         if (issued & (CEPH_CAP_FILE_EXCL|
 491                       CEPH_CAP_FILE_WR|
 492                       CEPH_CAP_FILE_BUFFER|
 493                       CEPH_CAP_AUTH_EXCL|
 494                       CEPH_CAP_XATTR_EXCL)) {
 495                 if (timespec_compare(ctime, &inode->i_ctime) > 0) {
 496                         dout("ctime %ld.%09ld -> %ld.%09ld inc w/ cap\n",
 497                              inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
 498                              ctime->tv_sec, ctime->tv_nsec);
 499                         inode->i_ctime = *ctime;
 500                 }
 501                 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) > 0) {
 502                         /* the MDS did a utimes() */
 503                         dout("mtime %ld.%09ld -> %ld.%09ld "
 504                              "tw %d -> %d\n",
 505                              inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
 506                              mtime->tv_sec, mtime->tv_nsec,
 507                              ci->i_time_warp_seq, (int)time_warp_seq);
 508
 509                         inode->i_mtime = *mtime;
 510                         inode->i_atime = *atime;
 511                         ci->i_time_warp_seq = time_warp_seq;
 512                 } else if (time_warp_seq == ci->i_time_warp_seq) {
 513                         /* nobody did utimes(); take the max */
 514                         if (timespec_compare(mtime, &inode->i_mtime) > 0) {
 515                                 dout("mtime %ld.%09ld -> %ld.%09ld inc\n",
 516                                      inode->i_mtime.tv_sec,
 517                                      inode->i_mtime.tv_nsec,
 518                                      mtime->tv_sec, mtime->tv_nsec);
 519                                 inode->i_mtime = *mtime;
 520                         }
 521                         if (timespec_compare(atime, &inode->i_atime) > 0) {
 522                                 dout("atime %ld.%09ld -> %ld.%09ld inc\n",
 523                                      inode->i_atime.tv_sec,
 524                                      inode->i_atime.tv_nsec,
 525                                      atime->tv_sec, atime->tv_nsec);
 526                                 inode->i_atime = *atime;
 527                         }
 528                 } else if (issued & CEPH_CAP_FILE_EXCL) {
 529                         /* we did a utimes(); ignore mds values */
 530                 } else {
 531                         warn = 1;
 532                 }
 533         } else {
 534                 /* we have no write|excl caps; whatever the MDS says is true */
 535                 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) >= 0) {
 536                         inode->i_ctime = *ctime;
 537                         inode->i_mtime = *mtime;
 538                         inode->i_atime = *atime;
 539                         ci->i_time_warp_seq = time_warp_seq;
 540                 } else {
 541                         warn = 1;
 542                 }
 543         }
 544         if (warn) /* time_warp_seq shouldn't go backwards */
 545                 dout("%p mds time_warp_seq %llu < %u\n",
 546                      inode, time_warp_seq, ci->i_time_warp_seq);
 547 }
 548
 549 /*
 550  * Populate an inode based on info from mds.  May be called on new or
 551  * existing inodes.
 552  */
 553 static int fill_inode(struct inode *inode,
 554                       struct ceph_mds_reply_info_in *iinfo,
 555                       struct ceph_mds_reply_dirfrag *dirinfo,
 556                       struct ceph_mds_session *session,
 557                       unsigned long ttl_from, int cap_fmode,
 558                       struct ceph_cap_reservation *caps_reservation)
 559 {
 560         struct ceph_mds_reply_inode *info = iinfo->in;
 561         struct ceph_inode_info *ci = ceph_inode(inode);
 562         int i;
 563         int issued, implemented;
 564         struct timespec mtime, atime, ctime;
 565         u32 nsplits;
 566         struct ceph_buffer *xattr_blob = NULL;
 567         int err = 0;
 568         int queue_trunc = 0;
 569
 570         dout("fill_inode %p ino %llx.%llx v %llu had %llu\n",
 571              inode, ceph_vinop(inode), le64_to_cpu(info->version),
 572              ci->i_version);
 573
 574         /*
 575          * prealloc xattr data, if it looks like we'll need it.  only
 576          * if len > 4 (meaning there are actually xattrs; the first 4
 577          * bytes are the xattr count).
 578          */
 579         if (iinfo->xattr_len > 4) {
 580                 xattr_blob = ceph_buffer_new(iinfo->xattr_len, GFP_NOFS);
 581                 if (!xattr_blob)
 582                         pr_err("fill_inode ENOMEM xattr blob %d bytes\n",
 583                                iinfo->xattr_len);
 584         }
 585
 586         spin_lock(&inode->i_lock);
 587
 588         /*
 589          * provided version will be odd if inode value is projected,
 590          * even if stable.  skip the update if we have newer stable
 591          * info (ours>=theirs, e.g. due to racing mds replies), unless
 592          * we are getting projected (unstable) info (in which case the
 593          * version is odd, and we want ours>theirs).
 594          *   us   them
 595          *   2    2     skip
 596          *   3    2     skip
 597          *   3    3     update
 598          */
 599         if (le64_to_cpu(info->version) > 0 &&
 600             (ci->i_version & ~1) >= le64_to_cpu(info->version))
 601                 goto no_change;
 602
 603         issued = __ceph_caps_issued(ci, &implemented);
 604         issued |= implemented | __ceph_caps_dirty(ci);
 605
 606         /* update inode */
 607         ci->i_version = le64_to_cpu(info->version);
 608         inode->i_version++;
 609         inode->i_rdev = le32_to_cpu(info->rdev);
 610
 611         if ((issued & CEPH_CAP_AUTH_EXCL) == 0) {
 612                 inode->i_mode = le32_to_cpu(info->mode);
 613                 inode->i_uid = le32_to_cpu(info->uid);
 614                 inode->i_gid = le32_to_cpu(info->gid);
 615                 dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode,
 616                      inode->i_uid, inode->i_gid);
 617         }
 618
 619         if ((issued & CEPH_CAP_LINK_EXCL) == 0)
 620                 inode->i_nlink = le32_to_cpu(info->nlink);
 621
 622         /* be careful with mtime, atime, size */
 623         ceph_decode_timespec(&atime, &info->atime);
 624         ceph_decode_timespec(&mtime, &info->mtime);
 625         ceph_decode_timespec(&ctime, &info->ctime);
 626         queue_trunc = ceph_fill_file_size(inode, issued,
 627                                           le32_to_cpu(info->truncate_seq),
 628                                           le64_to_cpu(info->truncate_size),
 629                                           le64_to_cpu(info->size));
 630         ceph_fill_file_time(inode, issued,
 631                             le32_to_cpu(info->time_warp_seq),
 632                             &ctime, &mtime, &atime);
 633
 634         /* only update max_size on auth cap */
 635         if ((info->cap.flags & CEPH_CAP_FLAG_AUTH) &&
 636             ci->i_max_size != le64_to_cpu(info->max_size)) {
 637                 dout("max_size %lld -> %llu\n", ci->i_max_size,
 638                      le64_to_cpu(info->max_size));
 639                 ci->i_max_size = le64_to_cpu(info->max_size);
 640         }
 641
 642         ci->i_layout = info->layout;
 643         inode->i_blkbits = fls(le32_to_cpu(info->layout.fl_stripe_unit)) - 1;
 644
 645         /* xattrs */
 646         /* note that if i_xattrs.len <= 4, i_xattrs.data will still be NULL. */
 647         if ((issued & CEPH_CAP_XATTR_EXCL) == 0 &&
 648             le64_to_cpu(info->xattr_version) > ci->i_xattrs.version) {
 649                 if (ci->i_xattrs.blob)
 650                         ceph_buffer_put(ci->i_xattrs.blob);
 651                 ci->i_xattrs.blob = xattr_blob;
 652                 if (xattr_blob)
 653                         memcpy(ci->i_xattrs.blob->vec.iov_base,
 654                                iinfo->xattr_data, iinfo->xattr_len);
 655                 ci->i_xattrs.version = le64_to_cpu(info->xattr_version);
 656                 xattr_blob = NULL;
 657         }
 658
 659         inode->i_mapping->a_ops = &ceph_aops;
 660         inode->i_mapping->backing_dev_info =
 661                 &ceph_sb_to_client(inode->i_sb)->backing_dev_info;
 662
 663         switch (inode->i_mode & S_IFMT) {
 664         case S_IFIFO:
 665         case S_IFBLK:
 666         case S_IFCHR:
 667         case S_IFSOCK:
 668                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
 669                 inode->i_op = &ceph_file_iops;
 670                 break;
 671         case S_IFREG:
 672                 inode->i_op = &ceph_file_iops;
 673                 inode->i_fop = &ceph_file_fops;
 674                 break;
 675         case S_IFLNK:
 676                 inode->i_op = &ceph_symlink_iops;
 677                 if (!ci->i_symlink) {
 678                         int symlen = iinfo->symlink_len;
 679                         char *sym;
 680
 681                         BUG_ON(symlen != inode->i_size);
 682                         spin_unlock(&inode->i_lock);
 683
 684                         err = -ENOMEM;
 685                         sym = kmalloc(symlen+1, GFP_NOFS);
 686                         if (!sym)
 687                                 goto out;
 688                         memcpy(sym, iinfo->symlink, symlen);
 689                         sym[symlen] = 0;
 690
 691                         spin_lock(&inode->i_lock);
 692                         if (!ci->i_symlink)
 693                                 ci->i_symlink = sym;
 694                         else
 695                                 kfree(sym); /* lost a race */
 696                 }
 697                 break;
 698         case S_IFDIR:
 699                 inode->i_op = &ceph_dir_iops;
 700                 inode->i_fop = &ceph_dir_fops;
 701
 702                 ci->i_dir_layout = iinfo->dir_layout;
 703
 704                 ci->i_files = le64_to_cpu(info->files);
 705                 ci->i_subdirs = le64_to_cpu(info->subdirs);
 706                 ci->i_rbytes = le64_to_cpu(info->rbytes);
 707                 ci->i_rfiles = le64_to_cpu(info->rfiles);
 708                 ci->i_rsubdirs = le64_to_cpu(info->rsubdirs);
 709                 ceph_decode_timespec(&ci->i_rctime, &info->rctime);
 710
 711                 /* set dir completion flag? */
 712                 if (ci->i_files == 0 && ci->i_subdirs == 0 &&
 713                     ceph_snap(inode) == CEPH_NOSNAP &&
 714                     (le32_to_cpu(info->cap.caps) & CEPH_CAP_FILE_SHARED) &&
 715                     (issued & CEPH_CAP_FILE_EXCL) == 0 &&
 716                     (ci->i_ceph_flags & CEPH_I_COMPLETE) == 0) {
 717                         dout(" marking %p complete (empty)\n", inode);
 718                         /* ci->i_ceph_flags |= CEPH_I_COMPLETE; */
 719                         ci->i_max_offset = 2;
 720                 }
 721                 break;
 722         default:
 723                 pr_err("fill_inode %llx.%llx BAD mode 0%o\n",
 724                        ceph_vinop(inode), inode->i_mode);
 725         }
 726
 727 no_change:
 728         spin_unlock(&inode->i_lock);
 729
 730         /* queue truncate if we saw i_size decrease */
 731         if (queue_trunc)
 732                 ceph_queue_vmtruncate(inode);
 733
 734         /* populate frag tree */
 735         /* FIXME: move me up, if/when version reflects fragtree changes */
 736         nsplits = le32_to_cpu(info->fragtree.nsplits);
 737         mutex_lock(&ci->i_fragtree_mutex);
 738         for (i = 0; i < nsplits; i++) {
 739                 u32 id = le32_to_cpu(info->fragtree.splits[i].frag);
 740                 struct ceph_inode_frag *frag = __get_or_create_frag(ci, id);
 741
 742                 if (IS_ERR(frag))
 743                         continue;
 744                 frag->split_by = le32_to_cpu(info->fragtree.splits[i].by);
 745                 dout(" frag %x split by %d\n", frag->frag, frag->split_by);
 746         }
 747         mutex_unlock(&ci->i_fragtree_mutex);
 748
 749         /* were we issued a capability? */
 750         if (info->cap.caps) {
 751                 if (ceph_snap(inode) == CEPH_NOSNAP) {
 752                         ceph_add_cap(inode, session,
 753                                      le64_to_cpu(info->cap.cap_id),
 754                                      cap_fmode,
 755                                      le32_to_cpu(info->cap.caps),
 756                                      le32_to_cpu(info->cap.wanted),
 757                                      le32_to_cpu(info->cap.seq),
 758                                      le32_to_cpu(info->cap.mseq),
 759                                      le64_to_cpu(info->cap.realm),
 760                                      info->cap.flags,
 761                                      caps_reservation);
 762                 } else {
 763                         spin_lock(&inode->i_lock);
 764                         dout(" %p got snap_caps %s\n", inode,
 765                              ceph_cap_string(le32_to_cpu(info->cap.caps)));
 766                         ci->i_snap_caps |= le32_to_cpu(info->cap.caps);
 767                         if (cap_fmode >= 0)
 768                                 __ceph_get_fmode(ci, cap_fmode);
 769                         spin_unlock(&inode->i_lock);
 770                 }
 771         } else if (cap_fmode >= 0) {
 772                 pr_warning("mds issued no caps on %llx.%llx\n",
 773                            ceph_vinop(inode));
 774                 __ceph_get_fmode(ci, cap_fmode);
 775         }
 776
 777         /* update delegation info? */
 778         if (dirinfo)
 779                 ceph_fill_dirfrag(inode, dirinfo);
 780
 781         err = 0;
 782
 783 out:
 784         if (xattr_blob)
 785                 ceph_buffer_put(xattr_blob);
 786         return err;
 787 }
 788
 789 /*
 790  * caller should hold session s_mutex.
 791  */
 792 static void update_dentry_lease(struct dentry *dentry,
 793                                 struct ceph_mds_reply_lease *lease,
 794                                 struct ceph_mds_session *session,
 795                                 unsigned long from_time)
 796 {
 797         struct ceph_dentry_info *di = ceph_dentry(dentry);
 798         long unsigned duration = le32_to_cpu(lease->duration_ms);
 799         long unsigned ttl = from_time + (duration * HZ) / 1000;
 800         long unsigned half_ttl = from_time + (duration * HZ / 2) / 1000;
 801         struct inode *dir;
 802
 803         /* only track leases on regular dentries */
 804         if (dentry->d_op != &ceph_dentry_ops)
 805                 return;
 806
 807         spin_lock(&dentry->d_lock);
 808         dout("update_dentry_lease %p mask %d duration %lu ms ttl %lu\n",
 809              dentry, le16_to_cpu(lease->mask), duration, ttl);
 810
 811         /* make lease_rdcache_gen match directory */
 812         dir = dentry->d_parent->d_inode;
 813         di->lease_shared_gen = ceph_inode(dir)->i_shared_gen;
 814
 815         if (lease->mask == 0)
 816                 goto out_unlock;
 817
 818         if (di->lease_gen == session->s_cap_gen &&
 819             time_before(ttl, dentry->d_time))
 820                 goto out_unlock;  /* we already have a newer lease. */
 821
 822         if (di->lease_session && di->lease_session != session)
 823                 goto out_unlock;
 824
 825         ceph_dentry_lru_touch(dentry);
 826
 827         if (!di->lease_session)
 828                 di->lease_session = ceph_get_mds_session(session);
 829         di->lease_gen = session->s_cap_gen;
 830         di->lease_seq = le32_to_cpu(lease->seq);
 831         di->lease_renew_after = half_ttl;
 832         di->lease_renew_from = 0;
 833         dentry->d_time = ttl;
 834 out_unlock:
 835         spin_unlock(&dentry->d_lock);
 836         return;
 837 }
 838
 839 /*
 840  * Set dentry's directory position based on the current dir's max, and
 841  * order it in d_subdirs, so that dcache_readdir behaves.
 842  */
 843 static void ceph_set_dentry_offset(struct dentry *dn)
 844 {
 845         struct dentry *dir = dn->d_parent;
 846         struct inode *inode = dn->d_parent->d_inode;
 847         struct ceph_dentry_info *di;
 848
 849         BUG_ON(!inode);
 850
 851         di = ceph_dentry(dn);
 852
 853         spin_lock(&inode->i_lock);
 854         if ((ceph_inode(inode)->i_ceph_flags & CEPH_I_COMPLETE) == 0) {
 855                 spin_unlock(&inode->i_lock);
 856                 return;
 857         }
 858         di->offset = ceph_inode(inode)->i_max_offset++;
 859         spin_unlock(&inode->i_lock);
 860
 861         spin_lock(&dir->d_lock);
 862         spin_lock_nested(&dn->d_lock, DENTRY_D_LOCK_NESTED);
 863         list_move(&dn->d_u.d_child, &dir->d_subdirs);
 864         dout("set_dentry_offset %p %lld (%p %p)\n", dn, di->offset,
 865              dn->d_u.d_child.prev, dn->d_u.d_child.next);
 866         spin_unlock(&dn->d_lock);
 867         spin_unlock(&dir->d_lock);
 868 }
 869
 870 /*
 871  * splice a dentry to an inode.
 872  * caller must hold directory i_mutex for this to be safe.
 873  *
 874  * we will only rehash the resulting dentry if @prehash is
 875  * true; @prehash will be set to false (for the benefit of
 876  * the caller) if we fail.
 877  */
 878 static struct dentry *splice_dentry(struct dentry *dn, struct inode *in,
 879                                     bool *prehash, bool set_offset)
 880 {
 881         struct dentry *realdn;
 882
 883         BUG_ON(dn->d_inode);
 884
 885         /* dn must be unhashed */
 886         if (!d_unhashed(dn))
 887                 d_drop(dn);
 888         realdn = d_materialise_unique(dn, in);
 889         if (IS_ERR(realdn)) {
 890                 pr_err("splice_dentry error %ld %p inode %p ino %llx.%llx\n",
 891                        PTR_ERR(realdn), dn, in, ceph_vinop(in));
 892                 if (prehash)
 893                         *prehash = false; /* don't rehash on error */
 894                 dn = realdn; /* note realdn contains the error */
 895                 goto out;
 896         } else if (realdn) {
 897                 dout("dn %p (%d) spliced with %p (%d) "
 898                      "inode %p ino %llx.%llx\n",
 899                      dn, dn->d_count,
 900                      realdn, realdn->d_count,
 901                      realdn->d_inode, ceph_vinop(realdn->d_inode));
 902                 dput(dn);
 903                 dn = realdn;
 904         } else {
 905                 BUG_ON(!ceph_dentry(dn));
 906                 dout("dn %p attached to %p ino %llx.%llx\n",
 907                      dn, dn->d_inode, ceph_vinop(dn->d_inode));
 908         }
 909         if ((!prehash || *prehash) && d_unhashed(dn))
 910                 d_rehash(dn);
 911         if (set_offset)
 912                 ceph_set_dentry_offset(dn);
 913 out:
 914         return dn;
 915 }
 916
 917 /*
 918  * Incorporate results into the local cache.  This is either just
 919  * one inode, or a directory, dentry, and possibly linked-to inode (e.g.,
 920  * after a lookup).
 921  *
 922  * A reply may contain
 923  *         a directory inode along with a dentry.
 924  *  and/or a target inode
 925  *
 926  * Called with snap_rwsem (read).
 927  */
 928 int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req,
 929                     struct ceph_mds_session *session)
 930 {
 931         struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
 932         struct inode *in = NULL;
 933         struct ceph_mds_reply_inode *ininfo;
 934         struct ceph_vino vino;
 935         struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
 936         int i = 0;
 937         int err = 0;
 938
 939         dout("fill_trace %p is_dentry %d is_target %d\n", req,
 940              rinfo->head->is_dentry, rinfo->head->is_target);
 941
 942 #if 0
 943         /*
 944          * Debugging hook:
 945          *
 946          * If we resend completed ops to a recovering mds, we get no
 947          * trace.  Since that is very rare, pretend this is the case
 948          * to ensure the 'no trace' handlers in the callers behave.
 949          *
 950          * Fill in inodes unconditionally to avoid breaking cap
 951          * invariants.
 952          */
 953         if (rinfo->head->op & CEPH_MDS_OP_WRITE) {
 954                 pr_info("fill_trace faking empty trace on %lld %s\n",
 955                         req->r_tid, ceph_mds_op_name(rinfo->head->op));
 956                 if (rinfo->head->is_dentry) {
 957                         rinfo->head->is_dentry = 0;
 958                         err = fill_inode(req->r_locked_dir,
 959                                          &rinfo->diri, rinfo->dirfrag,
 960                                          session, req->r_request_started, -1);
 961                 }
 962                 if (rinfo->head->is_target) {
 963                         rinfo->head->is_target = 0;
 964                         ininfo = rinfo->targeti.in;
 965                         vino.ino = le64_to_cpu(ininfo->ino);
 966                         vino.snap = le64_to_cpu(ininfo->snapid);
 967                         in = ceph_get_inode(sb, vino);
 968                         err = fill_inode(in, &rinfo->targeti, NULL,
 969                                          session, req->r_request_started,
 970                                          req->r_fmode);
 971                         iput(in);
 972                 }
 973         }
 974 #endif
 975
 976         if (!rinfo->head->is_target && !rinfo->head->is_dentry) {
 977                 dout("fill_trace reply is empty!\n");
 978                 if (rinfo->head->result == 0 && req->r_locked_dir)
 979                         ceph_invalidate_dir_request(req);
 980                 return 0;
 981         }
 982
 983         if (rinfo->head->is_dentry) {
 984                 struct inode *dir = req->r_locked_dir;
 985
 986                 err = fill_inode(dir, &rinfo->diri, rinfo->dirfrag,
 987                                  session, req->r_request_started, -1,
 988                                  &req->r_caps_reservation);
 989                 if (err < 0)
 990                         return err;
 991         }
 992
 993         /*
 994          * ignore null lease/binding on snapdir ENOENT, or else we
 995          * will have trouble splicing in the virtual snapdir later
 996          */
 997         if (rinfo->head->is_dentry && !req->r_aborted &&
 998             (rinfo->head->is_target || strncmp(req->r_dentry->d_name.name,
 999                                                fsc->mount_options->snapdir_name,
1000                                                req->r_dentry->d_name.len))) {
1001                 /*
1002                  * lookup link rename   : null -> possibly existing inode
1003                  * mknod symlink mkdir  : null -> new inode
1004                  * unlink               : linked -> null
1005                  */
1006                 struct inode *dir = req->r_locked_dir;
1007                 struct dentry *dn = req->r_dentry;
1008                 bool have_dir_cap, have_lease;
1009
1010                 BUG_ON(!dn);
1011                 BUG_ON(!dir);
1012                 BUG_ON(dn->d_parent->d_inode != dir);
1013                 BUG_ON(ceph_ino(dir) !=
1014                        le64_to_cpu(rinfo->diri.in->ino));
1015                 BUG_ON(ceph_snap(dir) !=
1016                        le64_to_cpu(rinfo->diri.in->snapid));
1017
1018                 /* do we have a lease on the whole dir? */
1019                 have_dir_cap =
1020                         (le32_to_cpu(rinfo->diri.in->cap.caps) &
1021                          CEPH_CAP_FILE_SHARED);
1022
1023                 /* do we have a dn lease? */
1024                 have_lease = have_dir_cap ||
1025                         (le16_to_cpu(rinfo->dlease->mask) &
1026                          CEPH_LOCK_DN);
1027
1028                 if (!have_lease)
1029                         dout("fill_trace  no dentry lease or dir cap\n");
1030
1031                 /* rename? */
1032                 if (req->r_old_dentry && req->r_op == CEPH_MDS_OP_RENAME) {
1033                         dout(" src %p '%.*s' dst %p '%.*s'\n",
1034                              req->r_old_dentry,
1035                              req->r_old_dentry->d_name.len,
1036                              req->r_old_dentry->d_name.name,
1037                              dn, dn->d_name.len, dn->d_name.name);
1038                         dout("fill_trace doing d_move %p -> %p\n",
1039                              req->r_old_dentry, dn);
1040
1041                         d_move(req->r_old_dentry, dn);
1042                         dout(" src %p '%.*s' dst %p '%.*s'\n",
1043                              req->r_old_dentry,
1044                              req->r_old_dentry->d_name.len,
1045                              req->r_old_dentry->d_name.name,
1046                              dn, dn->d_name.len, dn->d_name.name);
1047
1048                         /* ensure target dentry is invalidated, despite
1049                            rehashing bug in vfs_rename_dir */
1050                         ceph_invalidate_dentry_lease(dn);
1051
1052                         /*
1053                          * d_move() puts the renamed dentry at the end of
1054                          * d_subdirs.  We need to assign it an appropriate
1055                          * directory offset so we can behave when holding
1056                          * I_COMPLETE.
1057                          */
1058                         ceph_set_dentry_offset(req->r_old_dentry);
1059                         dout("dn %p gets new offset %lld\n", req->r_old_dentry,
1060                              ceph_dentry(req->r_old_dentry)->offset);
1061
1062                         dn = req->r_old_dentry;  /* use old_dentry */
1063                         in = dn->d_inode;
1064                 }
1065
1066                 /* null dentry? */
1067                 if (!rinfo->head->is_target) {
1068                         dout("fill_trace null dentry\n");
1069                         if (dn->d_inode) {
1070                                 dout("d_delete %p\n", dn);
1071                                 d_delete(dn);
1072                         } else {
1073                                 dout("d_instantiate %p NULL\n", dn);
1074                                 d_instantiate(dn, NULL);
1075                                 if (have_lease && d_unhashed(dn))
1076                                         d_rehash(dn);
1077                                 update_dentry_lease(dn, rinfo->dlease,
1078                                                     session,
1079                                                     req->r_request_started);
1080                         }
1081                         goto done;
1082                 }
1083
1084                 /* attach proper inode */
1085                 ininfo = rinfo->targeti.in;
1086                 vino.ino = le64_to_cpu(ininfo->ino);
1087                 vino.snap = le64_to_cpu(ininfo->snapid);
1088                 in = dn->d_inode;
1089                 if (!in) {
1090                         in = ceph_get_inode(sb, vino);
1091                         if (IS_ERR(in)) {
1092                                 pr_err("fill_trace bad get_inode "
1093                                        "%llx.%llx\n", vino.ino, vino.snap);
1094                                 err = PTR_ERR(in);
1095                                 d_delete(dn);
1096                                 goto done;
1097                         }
1098                         dn = splice_dentry(dn, in, &have_lease, true);
1099                         if (IS_ERR(dn)) {
1100                                 err = PTR_ERR(dn);
1101                                 goto done;
1102                         }
1103                         req->r_dentry = dn;  /* may have spliced */
1104                         igrab(in);
1105                 } else if (ceph_ino(in) == vino.ino &&
1106                            ceph_snap(in) == vino.snap) {
1107                         igrab(in);
1108                 } else {
1109                         dout(" %p links to %p %llx.%llx, not %llx.%llx\n",
1110                              dn, in, ceph_ino(in), ceph_snap(in),
1111                              vino.ino, vino.snap);
1112                         have_lease = false;
1113                         in = NULL;
1114                 }
1115
1116                 if (have_lease)
1117                         update_dentry_lease(dn, rinfo->dlease, session,
1118                                             req->r_request_started);
1119                 dout(" final dn %p\n", dn);
1120                 i++;
1121         } else if (req->r_op == CEPH_MDS_OP_LOOKUPSNAP ||
1122                    req->r_op == CEPH_MDS_OP_MKSNAP) {
1123                 struct dentry *dn = req->r_dentry;
1124
1125                 /* fill out a snapdir LOOKUPSNAP dentry */
1126                 BUG_ON(!dn);
1127                 BUG_ON(!req->r_locked_dir);
1128                 BUG_ON(ceph_snap(req->r_locked_dir) != CEPH_SNAPDIR);
1129                 ininfo = rinfo->targeti.in;
1130                 vino.ino = le64_to_cpu(ininfo->ino);
1131                 vino.snap = le64_to_cpu(ininfo->snapid);
1132                 in = ceph_get_inode(sb, vino);
1133                 if (IS_ERR(in)) {
1134                         pr_err("fill_inode get_inode badness %llx.%llx\n",
1135                                vino.ino, vino.snap);
1136                         err = PTR_ERR(in);
1137                         d_delete(dn);
1138                         goto done;
1139                 }
1140                 dout(" linking snapped dir %p to dn %p\n", in, dn);
1141                 dn = splice_dentry(dn, in, NULL, true);
1142                 if (IS_ERR(dn)) {
1143                         err = PTR_ERR(dn);
1144                         goto done;
1145                 }
1146                 req->r_dentry = dn;  /* may have spliced */
1147                 igrab(in);
1148                 rinfo->head->is_dentry = 1;  /* fool notrace handlers */
1149         }
1150
1151         if (rinfo->head->is_target) {
1152                 vino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1153                 vino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1154
1155                 if (in == NULL || ceph_ino(in) != vino.ino ||
1156                     ceph_snap(in) != vino.snap) {
1157                         in = ceph_get_inode(sb, vino);
1158                         if (IS_ERR(in)) {
1159                                 err = PTR_ERR(in);
1160                                 goto done;
1161                         }
1162                 }
1163                 req->r_target_inode = in;
1164
1165                 err = fill_inode(in,
1166                                  &rinfo->targeti, NULL,
1167                                  session, req->r_request_started,
1168                                  (le32_to_cpu(rinfo->head->result) == 0) ?
1169                                  req->r_fmode : -1,
1170                                  &req->r_caps_reservation);
1171                 if (err < 0) {
1172                         pr_err("fill_inode badness %p %llx.%llx\n",
1173                                in, ceph_vinop(in));
1174                         goto done;
1175                 }
1176         }
1177
1178 done:
1179         dout("fill_trace done err=%d\n", err);
1180         return err;
1181 }
1182
1183 /*
1184  * Prepopulate our cache with readdir results, leases, etc.
1185  */
1186 int ceph_readdir_prepopulate(struct ceph_mds_request *req,
1187                              struct ceph_mds_session *session)
1188 {
1189         struct dentry *parent = req->r_dentry;
1190         struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1191         struct qstr dname;
1192         struct dentry *dn;
1193         struct inode *in;
1194         int err = 0, i;
1195         struct inode *snapdir = NULL;
1196         struct ceph_mds_request_head *rhead = req->r_request->front.iov_base;
1197         u64 frag = le32_to_cpu(rhead->args.readdir.frag);
1198         struct ceph_dentry_info *di;
1199
1200         if (le32_to_cpu(rinfo->head->op) == CEPH_MDS_OP_LSSNAP) {
1201                 snapdir = ceph_get_snapdir(parent->d_inode);
1202                 parent = d_find_alias(snapdir);
1203                 dout("readdir_prepopulate %d items under SNAPDIR dn %p\n",
1204                      rinfo->dir_nr, parent);
1205         } else {
1206                 dout("readdir_prepopulate %d items under dn %p\n",
1207                      rinfo->dir_nr, parent);
1208                 if (rinfo->dir_dir)
1209                         ceph_fill_dirfrag(parent->d_inode, rinfo->dir_dir);
1210         }
1211
1212         for (i = 0; i < rinfo->dir_nr; i++) {
1213                 struct ceph_vino vino;
1214
1215                 dname.name = rinfo->dir_dname[i];
1216                 dname.len = rinfo->dir_dname_len[i];
1217                 dname.hash = full_name_hash(dname.name, dname.len);
1218
1219                 vino.ino = le64_to_cpu(rinfo->dir_in[i].in->ino);
1220                 vino.snap = le64_to_cpu(rinfo->dir_in[i].in->snapid);
1221
1222 retry_lookup:
1223                 dn = d_lookup(parent, &dname);
1224                 dout("d_lookup on parent=%p name=%.*s got %p\n",
1225                      parent, dname.len, dname.name, dn);
1226
1227                 if (!dn) {
1228                         dn = d_alloc(parent, &dname);
1229                         dout("d_alloc %p '%.*s' = %p\n", parent,
1230                              dname.len, dname.name, dn);
1231                         if (dn == NULL) {
1232                                 dout("d_alloc badness\n");
1233                                 err = -ENOMEM;
1234                                 goto out;
1235                         }
1236                         err = ceph_init_dentry(dn);
1237                         if (err < 0) {
1238                                 dput(dn);
1239                                 goto out;
1240                         }
1241                 } else if (dn->d_inode &&
1242                            (ceph_ino(dn->d_inode) != vino.ino ||
1243                             ceph_snap(dn->d_inode) != vino.snap)) {
1244                         dout(" dn %p points to wrong inode %p\n",
1245                              dn, dn->d_inode);
1246                         d_delete(dn);
1247                         dput(dn);
1248                         goto retry_lookup;
1249                 } else {
1250                         /* reorder parent's d_subdirs */
1251                         spin_lock(&parent->d_lock);
1252                         spin_lock_nested(&dn->d_lock, DENTRY_D_LOCK_NESTED);
1253                         list_move(&dn->d_u.d_child, &parent->d_subdirs);
1254                         spin_unlock(&dn->d_lock);
1255                         spin_unlock(&parent->d_lock);
1256                 }
1257
1258                 di = dn->d_fsdata;
1259                 di->offset = ceph_make_fpos(frag, i + req->r_readdir_offset);
1260
1261                 /* inode */
1262                 if (dn->d_inode) {
1263                         in = dn->d_inode;
1264                 } else {
1265                         in = ceph_get_inode(parent->d_sb, vino);
1266                         if (IS_ERR(in)) {
1267                                 dout("new_inode badness\n");
1268                                 d_delete(dn);
1269                                 dput(dn);
1270                                 err = PTR_ERR(in);
1271                                 goto out;
1272                         }
1273                         dn = splice_dentry(dn, in, NULL, false);
1274                         if (IS_ERR(dn))
1275                                 dn = NULL;
1276                 }
1277
1278                 if (fill_inode(in, &rinfo->dir_in[i], NULL, session,
1279                                req->r_request_started, -1,
1280                                &req->r_caps_reservation) < 0) {
1281                         pr_err("fill_inode badness on %p\n", in);
1282                         goto next_item;
1283                 }
1284                 if (dn)
1285                         update_dentry_lease(dn, rinfo->dir_dlease[i],
1286                                             req->r_session,
1287                                             req->r_request_started);
1288 next_item:
1289                 if (dn)
1290                         dput(dn);
1291         }
1292         req->r_did_prepopulate = true;
1293
1294 out:
1295         if (snapdir) {
1296                 iput(snapdir);
1297                 dput(parent);
1298         }
1299         dout("readdir_prepopulate done\n");
1300         return err;
1301 }
1302
1303 int ceph_inode_set_size(struct inode *inode, loff_t size)
1304 {
1305         struct ceph_inode_info *ci = ceph_inode(inode);
1306         int ret = 0;
1307
1308         spin_lock(&inode->i_lock);
1309         dout("set_size %p %llu -> %llu\n", inode, inode->i_size, size);
1310         inode->i_size = size;
1311         inode->i_blocks = (size + (1 << 9) - 1) >> 9;
1312
1313         /* tell the MDS if we are approaching max_size */
1314         if ((size << 1) >= ci->i_max_size &&
1315             (ci->i_reported_size << 1) < ci->i_max_size)
1316                 ret = 1;
1317
1318         spin_unlock(&inode->i_lock);
1319         return ret;
1320 }
1321
1322 /*
1323  * Write back inode data in a worker thread.  (This can't be done
1324  * in the message handler context.)
1325  */
1326 void ceph_queue_writeback(struct inode *inode)
1327 {
1328         if (queue_work(ceph_inode_to_client(inode)->wb_wq,
1329                        &ceph_inode(inode)->i_wb_work)) {
1330                 dout("ceph_queue_writeback %p\n", inode);
1331                 igrab(inode);
1332         } else {
1333                 dout("ceph_queue_writeback %p failed\n", inode);
1334         }
1335 }
1336
1337 static void ceph_writeback_work(struct work_struct *work)
1338 {
1339         struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1340                                                   i_wb_work);
1341         struct inode *inode = &ci->vfs_inode;
1342
1343         dout("writeback %p\n", inode);
1344         filemap_fdatawrite(&inode->i_data);
1345         iput(inode);
1346 }
1347
1348 /*
1349  * queue an async invalidation
1350  */
1351 void ceph_queue_invalidate(struct inode *inode)
1352 {
1353         if (queue_work(ceph_inode_to_client(inode)->pg_inv_wq,
1354                        &ceph_inode(inode)->i_pg_inv_work)) {
1355                 dout("ceph_queue_invalidate %p\n", inode);
1356                 igrab(inode);
1357         } else {
1358                 dout("ceph_queue_invalidate %p failed\n", inode);
1359         }
1360 }
1361
1362 /*
1363  * invalidate any pages that are not dirty or under writeback.  this
1364  * includes pages that are clean and mapped.
1365  */
1366 static void ceph_invalidate_nondirty_pages(struct address_space *mapping)
1367 {
1368         struct pagevec pvec;
1369         pgoff_t next = 0;
1370         int i;
1371
1372         pagevec_init(&pvec, 0);
1373         while (pagevec_lookup(&pvec, mapping, next, PAGEVEC_SIZE)) {
1374                 for (i = 0; i < pagevec_count(&pvec); i++) {
1375                         struct page *page = pvec.pages[i];
1376                         pgoff_t index;
1377                         int skip_page =
1378                                 (PageDirty(page) || PageWriteback(page));
1379
1380                         if (!skip_page)
1381                                 skip_page = !trylock_page(page);
1382
1383                         /*
1384                          * We really shouldn't be looking at the ->index of an
1385                          * unlocked page.  But we're not allowed to lock these
1386                          * pages.  So we rely upon nobody altering the ->index
1387                          * of this (pinned-by-us) page.
1388                          */
1389                         index = page->index;
1390                         if (index > next)
1391                                 next = index;
1392                         next++;
1393
1394                         if (skip_page)
1395                                 continue;
1396
1397                         generic_error_remove_page(mapping, page);
1398                         unlock_page(page);
1399                 }
1400                 pagevec_release(&pvec);
1401                 cond_resched();
1402         }
1403 }
1404
1405 /*
1406  * Invalidate inode pages in a worker thread.  (This can't be done
1407  * in the message handler context.)
1408  */
1409 static void ceph_invalidate_work(struct work_struct *work)
1410 {
1411         struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1412                                                   i_pg_inv_work);
1413         struct inode *inode = &ci->vfs_inode;
1414         u32 orig_gen;
1415         int check = 0;
1416
1417         spin_lock(&inode->i_lock);
1418         dout("invalidate_pages %p gen %d revoking %d\n", inode,
1419              ci->i_rdcache_gen, ci->i_rdcache_revoking);
1420         if (ci->i_rdcache_revoking != ci->i_rdcache_gen) {
1421                 /* nevermind! */
1422                 spin_unlock(&inode->i_lock);
1423                 goto out;
1424         }
1425         orig_gen = ci->i_rdcache_gen;
1426         spin_unlock(&inode->i_lock);
1427
1428         ceph_invalidate_nondirty_pages(inode->i_mapping);
1429
1430         spin_lock(&inode->i_lock);
1431         if (orig_gen == ci->i_rdcache_gen &&
1432             orig_gen == ci->i_rdcache_revoking) {
1433                 dout("invalidate_pages %p gen %d successful\n", inode,
1434                      ci->i_rdcache_gen);
1435                 ci->i_rdcache_revoking--;
1436                 check = 1;
1437         } else {
1438                 dout("invalidate_pages %p gen %d raced, now %d revoking %d\n",
1439                      inode, orig_gen, ci->i_rdcache_gen,
1440                      ci->i_rdcache_revoking);
1441         }
1442         spin_unlock(&inode->i_lock);
1443
1444         if (check)
1445                 ceph_check_caps(ci, 0, NULL);
1446 out:
1447         iput(inode);
1448 }
1449
1450
1451 /*
1452  * called by trunc_wq; take i_mutex ourselves
1453  *
1454  * We also truncate in a separate thread as well.
1455  */
1456 static void ceph_vmtruncate_work(struct work_struct *work)
1457 {
1458         struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1459                                                   i_vmtruncate_work);
1460         struct inode *inode = &ci->vfs_inode;
1461
1462         dout("vmtruncate_work %p\n", inode);
1463         mutex_lock(&inode->i_mutex);
1464         __ceph_do_pending_vmtruncate(inode);
1465         mutex_unlock(&inode->i_mutex);
1466         iput(inode);
1467 }
1468
1469 /*
1470  * Queue an async vmtruncate.  If we fail to queue work, we will handle
1471  * the truncation the next time we call __ceph_do_pending_vmtruncate.
1472  */
1473 void ceph_queue_vmtruncate(struct inode *inode)
1474 {
1475         struct ceph_inode_info *ci = ceph_inode(inode);
1476
1477         if (queue_work(ceph_sb_to_client(inode->i_sb)->trunc_wq,
1478                        &ci->i_vmtruncate_work)) {
1479                 dout("ceph_queue_vmtruncate %p\n", inode);
1480                 igrab(inode);
1481         } else {
1482                 dout("ceph_queue_vmtruncate %p failed, pending=%d\n",
1483                      inode, ci->i_truncate_pending);
1484         }
1485 }
1486
1487 /*
1488  * called with i_mutex held.
1489  *
1490  * Make sure any pending truncation is applied before doing anything
1491  * that may depend on it.
1492  */
1493 void __ceph_do_pending_vmtruncate(struct inode *inode)
1494 {
1495         struct ceph_inode_info *ci = ceph_inode(inode);
1496         u64 to;
1497         int wrbuffer_refs, wake = 0;
1498
1499 retry:
1500         spin_lock(&inode->i_lock);
1501         if (ci->i_truncate_pending == 0) {
1502                 dout("__do_pending_vmtruncate %p none pending\n", inode);
1503                 spin_unlock(&inode->i_lock);
1504                 return;
1505         }
1506
1507         /*
1508          * make sure any dirty snapped pages are flushed before we
1509          * possibly truncate them.. so write AND block!
1510          */
1511         if (ci->i_wrbuffer_ref_head < ci->i_wrbuffer_ref) {
1512                 dout("__do_pending_vmtruncate %p flushing snaps first\n",
1513                      inode);
1514                 spin_unlock(&inode->i_lock);
1515                 filemap_write_and_wait_range(&inode->i_data, 0,
1516                                              inode->i_sb->s_maxbytes);
1517                 goto retry;
1518         }
1519
1520         to = ci->i_truncate_size;
1521         wrbuffer_refs = ci->i_wrbuffer_ref;
1522         dout("__do_pending_vmtruncate %p (%d) to %lld\n", inode,
1523              ci->i_truncate_pending, to);
1524         spin_unlock(&inode->i_lock);
1525
1526         truncate_inode_pages(inode->i_mapping, to);
1527
1528         spin_lock(&inode->i_lock);
1529         ci->i_truncate_pending--;
1530         if (ci->i_truncate_pending == 0)
1531                 wake = 1;
1532         spin_unlock(&inode->i_lock);
1533
1534         if (wrbuffer_refs == 0)
1535                 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
1536         if (wake)
1537                 wake_up_all(&ci->i_cap_wq);
1538 }
1539
1540
1541 /*
1542  * symlinks
1543  */
1544 static void *ceph_sym_follow_link(struct dentry *dentry, struct nameidata *nd)
1545 {
1546         struct ceph_inode_info *ci = ceph_inode(dentry->d_inode);
1547         nd_set_link(nd, ci->i_symlink);
1548         return NULL;
1549 }
1550
1551 static const struct inode_operations ceph_symlink_iops = {
1552         .readlink = generic_readlink,
1553         .follow_link = ceph_sym_follow_link,
1554 };
1555
1556 /*
1557  * setattr
1558  */
1559 int ceph_setattr(struct dentry *dentry, struct iattr *attr)
1560 {
1561         struct inode *inode = dentry->d_inode;
1562         struct ceph_inode_info *ci = ceph_inode(inode);
1563         struct inode *parent_inode = dentry->d_parent->d_inode;
1564         const unsigned int ia_valid = attr->ia_valid;
1565         struct ceph_mds_request *req;
1566         struct ceph_mds_client *mdsc = ceph_sb_to_client(dentry->d_sb)->mdsc;
1567         int issued;
1568         int release = 0, dirtied = 0;
1569         int mask = 0;
1570         int err = 0;
1571         int inode_dirty_flags = 0;
1572
1573         if (ceph_snap(inode) != CEPH_NOSNAP)
1574                 return -EROFS;
1575
1576         __ceph_do_pending_vmtruncate(inode);
1577
1578         err = inode_change_ok(inode, attr);
1579         if (err != 0)
1580                 return err;
1581
1582         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETATTR,
1583                                        USE_AUTH_MDS);
1584         if (IS_ERR(req))
1585                 return PTR_ERR(req);
1586
1587         spin_lock(&inode->i_lock);
1588         issued = __ceph_caps_issued(ci, NULL);
1589         dout("setattr %p issued %s\n", inode, ceph_cap_string(issued));
1590
1591         if (ia_valid & ATTR_UID) {
1592                 dout("setattr %p uid %d -> %d\n", inode,
1593                      inode->i_uid, attr->ia_uid);
1594                 if (issued & CEPH_CAP_AUTH_EXCL) {
1595                         inode->i_uid = attr->ia_uid;
1596                         dirtied |= CEPH_CAP_AUTH_EXCL;
1597                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1598                            attr->ia_uid != inode->i_uid) {
1599                         req->r_args.setattr.uid = cpu_to_le32(attr->ia_uid);
1600                         mask |= CEPH_SETATTR_UID;
1601                         release |= CEPH_CAP_AUTH_SHARED;
1602                 }
1603         }
1604         if (ia_valid & ATTR_GID) {
1605                 dout("setattr %p gid %d -> %d\n", inode,
1606                      inode->i_gid, attr->ia_gid);
1607                 if (issued & CEPH_CAP_AUTH_EXCL) {
1608                         inode->i_gid = attr->ia_gid;
1609                         dirtied |= CEPH_CAP_AUTH_EXCL;
1610                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1611                            attr->ia_gid != inode->i_gid) {
1612                         req->r_args.setattr.gid = cpu_to_le32(attr->ia_gid);
1613                         mask |= CEPH_SETATTR_GID;
1614                         release |= CEPH_CAP_AUTH_SHARED;
1615                 }
1616         }
1617         if (ia_valid & ATTR_MODE) {
1618                 dout("setattr %p mode 0%o -> 0%o\n", inode, inode->i_mode,
1619                      attr->ia_mode);
1620                 if (issued & CEPH_CAP_AUTH_EXCL) {
1621                         inode->i_mode = attr->ia_mode;
1622                         dirtied |= CEPH_CAP_AUTH_EXCL;
1623                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1624                            attr->ia_mode != inode->i_mode) {
1625                         req->r_args.setattr.mode = cpu_to_le32(attr->ia_mode);
1626                         mask |= CEPH_SETATTR_MODE;
1627                         release |= CEPH_CAP_AUTH_SHARED;
1628                 }
1629         }
1630
1631         if (ia_valid & ATTR_ATIME) {
1632                 dout("setattr %p atime %ld.%ld -> %ld.%ld\n", inode,
1633                      inode->i_atime.tv_sec, inode->i_atime.tv_nsec,
1634                      attr->ia_atime.tv_sec, attr->ia_atime.tv_nsec);
1635                 if (issued & CEPH_CAP_FILE_EXCL) {
1636                         ci->i_time_warp_seq++;
1637                         inode->i_atime = attr->ia_atime;
1638                         dirtied |= CEPH_CAP_FILE_EXCL;
1639                 } else if ((issued & CEPH_CAP_FILE_WR) &&
1640                            timespec_compare(&inode->i_atime,
1641                                             &attr->ia_atime) < 0) {
1642                         inode->i_atime = attr->ia_atime;
1643                         dirtied |= CEPH_CAP_FILE_WR;
1644                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1645                            !timespec_equal(&inode->i_atime, &attr->ia_atime)) {
1646                         ceph_encode_timespec(&req->r_args.setattr.atime,
1647                                              &attr->ia_atime);
1648                         mask |= CEPH_SETATTR_ATIME;
1649                         release |= CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_RD |
1650                                 CEPH_CAP_FILE_WR;
1651                 }
1652         }
1653         if (ia_valid & ATTR_MTIME) {
1654                 dout("setattr %p mtime %ld.%ld -> %ld.%ld\n", inode,
1655                      inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
1656                      attr->ia_mtime.tv_sec, attr->ia_mtime.tv_nsec);
1657                 if (issued & CEPH_CAP_FILE_EXCL) {
1658                         ci->i_time_warp_seq++;
1659                         inode->i_mtime = attr->ia_mtime;
1660                         dirtied |= CEPH_CAP_FILE_EXCL;
1661                 } else if ((issued & CEPH_CAP_FILE_WR) &&
1662                            timespec_compare(&inode->i_mtime,
1663                                             &attr->ia_mtime) < 0) {
1664                         inode->i_mtime = attr->ia_mtime;
1665                         dirtied |= CEPH_CAP_FILE_WR;
1666                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1667                            !timespec_equal(&inode->i_mtime, &attr->ia_mtime)) {
1668                         ceph_encode_timespec(&req->r_args.setattr.mtime,
1669                                              &attr->ia_mtime);
1670                         mask |= CEPH_SETATTR_MTIME;
1671                         release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD |
1672                                 CEPH_CAP_FILE_WR;
1673                 }
1674         }
1675         if (ia_valid & ATTR_SIZE) {
1676                 dout("setattr %p size %lld -> %lld\n", inode,
1677                      inode->i_size, attr->ia_size);
1678                 if (attr->ia_size > inode->i_sb->s_maxbytes) {
1679                         err = -EINVAL;
1680                         goto out;
1681                 }
1682                 if ((issued & CEPH_CAP_FILE_EXCL) &&
1683                     attr->ia_size > inode->i_size) {
1684                         inode->i_size = attr->ia_size;
1685                         inode->i_blocks =
1686                                 (attr->ia_size + (1 << 9) - 1) >> 9;
1687                         inode->i_ctime = attr->ia_ctime;
1688                         ci->i_reported_size = attr->ia_size;
1689                         dirtied |= CEPH_CAP_FILE_EXCL;
1690                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1691                            attr->ia_size != inode->i_size) {
1692                         req->r_args.setattr.size = cpu_to_le64(attr->ia_size);
1693                         req->r_args.setattr.old_size =
1694                                 cpu_to_le64(inode->i_size);
1695                         mask |= CEPH_SETATTR_SIZE;
1696                         release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD |
1697                                 CEPH_CAP_FILE_WR;
1698                 }
1699         }
1700
1701         /* these do nothing */
1702         if (ia_valid & ATTR_CTIME) {
1703                 bool only = (ia_valid & (ATTR_SIZE|ATTR_MTIME|ATTR_ATIME|
1704                                          ATTR_MODE|ATTR_UID|ATTR_GID)) == 0;
1705                 dout("setattr %p ctime %ld.%ld -> %ld.%ld (%s)\n", inode,
1706                      inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
1707                      attr->ia_ctime.tv_sec, attr->ia_ctime.tv_nsec,
1708                      only ? "ctime only" : "ignored");
1709                 inode->i_ctime = attr->ia_ctime;
1710                 if (only) {
1711                         /*
1712                          * if kernel wants to dirty ctime but nothing else,
1713                          * we need to choose a cap to dirty under, or do
1714                          * a almost-no-op setattr
1715                          */
1716                         if (issued & CEPH_CAP_AUTH_EXCL)
1717                                 dirtied |= CEPH_CAP_AUTH_EXCL;
1718                         else if (issued & CEPH_CAP_FILE_EXCL)
1719                                 dirtied |= CEPH_CAP_FILE_EXCL;
1720                         else if (issued & CEPH_CAP_XATTR_EXCL)
1721                                 dirtied |= CEPH_CAP_XATTR_EXCL;
1722                         else
1723                                 mask |= CEPH_SETATTR_CTIME;
1724                 }
1725         }
1726         if (ia_valid & ATTR_FILE)
1727                 dout("setattr %p ATTR_FILE ... hrm!\n", inode);
1728
1729         if (dirtied) {
1730                 inode_dirty_flags = __ceph_mark_dirty_caps(ci, dirtied);
1731                 inode->i_ctime = CURRENT_TIME;
1732         }
1733
1734         release &= issued;
1735         spin_unlock(&inode->i_lock);
1736
1737         if (inode_dirty_flags)
1738                 __mark_inode_dirty(inode, inode_dirty_flags);
1739
1740         if (mask) {
1741                 req->r_inode = igrab(inode);
1742                 req->r_inode_drop = release;
1743                 req->r_args.setattr.mask = cpu_to_le32(mask);
1744                 req->r_num_caps = 1;
1745                 err = ceph_mdsc_do_request(mdsc, parent_inode, req);
1746         }
1747         dout("setattr %p result=%d (%s locally, %d remote)\n", inode, err,
1748              ceph_cap_string(dirtied), mask);
1749
1750         ceph_mdsc_put_request(req);
1751         __ceph_do_pending_vmtruncate(inode);
1752         return err;
1753 out:
1754         spin_unlock(&inode->i_lock);
1755         ceph_mdsc_put_request(req);
1756         return err;
1757 }
1758
1759 /*
1760  * Verify that we have a lease on the given mask.  If not,
1761  * do a getattr against an mds.
1762  */
1763 int ceph_do_getattr(struct inode *inode, int mask)
1764 {
1765         struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
1766         struct ceph_mds_client *mdsc = fsc->mdsc;
1767         struct ceph_mds_request *req;
1768         int err;
1769
1770         if (ceph_snap(inode) == CEPH_SNAPDIR) {
1771                 dout("do_getattr inode %p SNAPDIR\n", inode);
1772                 return 0;
1773         }
1774
1775         dout("do_getattr inode %p mask %s mode 0%o\n", inode, ceph_cap_string(mask), inode->i_mode);
1776         if (ceph_caps_issued_mask(ceph_inode(inode), mask, 1))
1777                 return 0;
1778
1779         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
1780         if (IS_ERR(req))
1781                 return PTR_ERR(req);
1782         req->r_inode = igrab(inode);
1783         req->r_num_caps = 1;
1784         req->r_args.getattr.mask = cpu_to_le32(mask);
1785         err = ceph_mdsc_do_request(mdsc, NULL, req);
1786         ceph_mdsc_put_request(req);
1787         dout("do_getattr result=%d\n", err);
1788         return err;
1789 }
1790
1791
1792 /*
1793  * Check inode permissions.  We verify we have a valid value for
1794  * the AUTH cap, then call the generic handler.
1795  */
1796 int ceph_permission(struct inode *inode, int mask, unsigned int flags)
1797 {
1798         int err;
1799
1800         if (flags & IPERM_FLAG_RCU)
1801                 return -ECHILD;
1802
1803         err = ceph_do_getattr(inode, CEPH_CAP_AUTH_SHARED);
1804
1805         if (!err)
1806                 err = generic_permission(inode, mask, flags, NULL);
1807         return err;
1808 }
1809
1810 /*
1811  * Get all attributes.  Hopefully somedata we'll have a statlite()
1812  * and can limit the fields we require to be accurate.
1813  */
1814 int ceph_getattr(struct vfsmount *mnt, struct dentry *dentry,
1815                  struct kstat *stat)
1816 {
1817         struct inode *inode = dentry->d_inode;
1818         struct ceph_inode_info *ci = ceph_inode(inode);
1819         int err;
1820
1821         err = ceph_do_getattr(inode, CEPH_STAT_CAP_INODE_ALL);
1822         if (!err) {
1823                 generic_fillattr(inode, stat);
1824                 stat->ino = ceph_translate_ino(inode->i_sb, inode->i_ino);
1825                 if (ceph_snap(inode) != CEPH_NOSNAP)
1826                         stat->dev = ceph_snap(inode);
1827                 else
1828                         stat->dev = 0;
1829                 if (S_ISDIR(inode->i_mode)) {
1830                         if (ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb),
1831                                                 RBYTES))
1832                                 stat->size = ci->i_rbytes;
1833                         else
1834                                 stat->size = ci->i_files + ci->i_subdirs;
1835                         stat->blocks = 0;
1836                         stat->blksize = 65536;
1837                 }
1838         }
1839         return err;
1840 }