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 struct inode *ceph_get_inode(struct super_block *sb, struct ceph_vino vino)
  40 {
  41         struct inode *inode;
  42         ino_t t = ceph_vino_to_ino(vino);
  43
  44         inode = iget5_locked(sb, t, ceph_ino_compare, ceph_set_ino_cb, &vino);
  45         if (inode == NULL)
  46                 return ERR_PTR(-ENOMEM);
  47         if (inode->i_state & I_NEW) {
  48                 dout("get_inode created new inode %p %llx.%llx ino %llx\n",
  49                      inode, ceph_vinop(inode), (u64)inode->i_ino);
  50                 unlock_new_inode(inode);
  51         }
  52
  53         dout("get_inode on %lu=%llx.%llx got %p\n", inode->i_ino, vino.ino,
  54              vino.snap, inode);
  55         return inode;
  56 }
  57
  58 /*
  59  * get/constuct snapdir inode for a given directory
  60  */
  61 struct inode *ceph_get_snapdir(struct inode *parent)
  62 {
  63         struct ceph_vino vino = {
  64                 .ino = ceph_ino(parent),
  65                 .snap = CEPH_SNAPDIR,
  66         };
  67         struct inode *inode = ceph_get_inode(parent->i_sb, vino);
  68         struct ceph_inode_info *ci = ceph_inode(inode);
  69
  70         BUG_ON(!S_ISDIR(parent->i_mode));
  71         if (IS_ERR(inode))
  72                 return inode;
  73         inode->i_mode = parent->i_mode;
  74         inode->i_uid = parent->i_uid;
  75         inode->i_gid = parent->i_gid;
  76         inode->i_op = &ceph_dir_iops;
  77         inode->i_fop = &ceph_dir_fops;
  78         ci->i_snap_caps = CEPH_CAP_PIN; /* so we can open */
  79         ci->i_rbytes = 0;
  80         return inode;
  81 }
  82
  83 const struct inode_operations ceph_file_iops = {
  84         .permission = ceph_permission,
  85         .setattr = ceph_setattr,
  86         .getattr = ceph_getattr,
  87         .setxattr = ceph_setxattr,
  88         .getxattr = ceph_getxattr,
  89         .listxattr = ceph_listxattr,
  90         .removexattr = ceph_removexattr,
  91 };
  92
  93
  94 /*
  95  * We use a 'frag tree' to keep track of the MDS's directory fragments
  96  * for a given inode (usually there is just a single fragment).  We
  97  * need to know when a child frag is delegated to a new MDS, or when
  98  * it is flagged as replicated, so we can direct our requests
  99  * accordingly.
 100  */
 101
 102 /*
 103  * find/create a frag in the tree
 104  */
 105 static struct ceph_inode_frag *__get_or_create_frag(struct ceph_inode_info *ci,
 106                                                     u32 f)
 107 {
 108         struct rb_node **p;
 109         struct rb_node *parent = NULL;
 110         struct ceph_inode_frag *frag;
 111         int c;
 112
 113         p = &ci->i_fragtree.rb_node;
 114         while (*p) {
 115                 parent = *p;
 116                 frag = rb_entry(parent, struct ceph_inode_frag, node);
 117                 c = ceph_frag_compare(f, frag->frag);
 118                 if (c < 0)
 119                         p = &(*p)->rb_left;
 120                 else if (c > 0)
 121                         p = &(*p)->rb_right;
 122                 else
 123                         return frag;
 124         }
 125
 126         frag = kmalloc(sizeof(*frag), GFP_NOFS);
 127         if (!frag) {
 128                 pr_err("__get_or_create_frag ENOMEM on %p %llx.%llx "
 129                        "frag %x\n", &ci->vfs_inode,
 130                        ceph_vinop(&ci->vfs_inode), f);
 131                 return ERR_PTR(-ENOMEM);
 132         }
 133         frag->frag = f;
 134         frag->split_by = 0;
 135         frag->mds = -1;
 136         frag->ndist = 0;
 137
 138         rb_link_node(&frag->node, parent, p);
 139         rb_insert_color(&frag->node, &ci->i_fragtree);
 140
 141         dout("get_or_create_frag added %llx.%llx frag %x\n",
 142              ceph_vinop(&ci->vfs_inode), f);
 143         return frag;
 144 }
 145
 146 /*
 147  * find a specific frag @f
 148  */
 149 struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci, u32 f)
 150 {
 151         struct rb_node *n = ci->i_fragtree.rb_node;
 152
 153         while (n) {
 154                 struct ceph_inode_frag *frag =
 155                         rb_entry(n, struct ceph_inode_frag, node);
 156                 int c = ceph_frag_compare(f, frag->frag);
 157                 if (c < 0)
 158                         n = n->rb_left;
 159                 else if (c > 0)
 160                         n = n->rb_right;
 161                 else
 162                         return frag;
 163         }
 164         return NULL;
 165 }
 166
 167 /*
 168  * Choose frag containing the given value @v.  If @pfrag is
 169  * specified, copy the frag delegation info to the caller if
 170  * it is present.
 171  */
 172 u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
 173                      struct ceph_inode_frag *pfrag,
 174                      int *found)
 175 {
 176         u32 t = ceph_frag_make(0, 0);
 177         struct ceph_inode_frag *frag;
 178         unsigned nway, i;
 179         u32 n;
 180
 181         if (found)
 182                 *found = 0;
 183
 184         mutex_lock(&ci->i_fragtree_mutex);
 185         while (1) {
 186                 WARN_ON(!ceph_frag_contains_value(t, v));
 187                 frag = __ceph_find_frag(ci, t);
 188                 if (!frag)
 189                         break; /* t is a leaf */
 190                 if (frag->split_by == 0) {
 191                         if (pfrag)
 192                                 memcpy(pfrag, frag, sizeof(*pfrag));
 193                         if (found)
 194                                 *found = 1;
 195                         break;
 196                 }
 197
 198                 /* choose child */
 199                 nway = 1 << frag->split_by;
 200                 dout("choose_frag(%x) %x splits by %d (%d ways)\n", v, t,
 201                      frag->split_by, nway);
 202                 for (i = 0; i < nway; i++) {
 203                         n = ceph_frag_make_child(t, frag->split_by, i);
 204                         if (ceph_frag_contains_value(n, v)) {
 205                                 t = n;
 206                                 break;
 207                         }
 208                 }
 209                 BUG_ON(i == nway);
 210         }
 211         dout("choose_frag(%x) = %x\n", v, t);
 212
 213         mutex_unlock(&ci->i_fragtree_mutex);
 214         return t;
 215 }
 216
 217 /*
 218  * Process dirfrag (delegation) info from the mds.  Include leaf
 219  * fragment in tree ONLY if ndist > 0.  Otherwise, only
 220  * branches/splits are included in i_fragtree)
 221  */
 222 static int ceph_fill_dirfrag(struct inode *inode,
 223                              struct ceph_mds_reply_dirfrag *dirinfo)
 224 {
 225         struct ceph_inode_info *ci = ceph_inode(inode);
 226         struct ceph_inode_frag *frag;
 227         u32 id = le32_to_cpu(dirinfo->frag);
 228         int mds = le32_to_cpu(dirinfo->auth);
 229         int ndist = le32_to_cpu(dirinfo->ndist);
 230         int i;
 231         int err = 0;
 232
 233         mutex_lock(&ci->i_fragtree_mutex);
 234         if (ndist == 0) {
 235                 /* no delegation info needed. */
 236                 frag = __ceph_find_frag(ci, id);
 237                 if (!frag)
 238                         goto out;
 239                 if (frag->split_by == 0) {
 240                         /* tree leaf, remove */
 241                         dout("fill_dirfrag removed %llx.%llx frag %x"
 242                              " (no ref)\n", ceph_vinop(inode), id);
 243                         rb_erase(&frag->node, &ci->i_fragtree);
 244                         kfree(frag);
 245                 } else {
 246                         /* tree branch, keep and clear */
 247                         dout("fill_dirfrag cleared %llx.%llx frag %x"
 248                              " referral\n", ceph_vinop(inode), id);
 249                         frag->mds = -1;
 250                         frag->ndist = 0;
 251                 }
 252                 goto out;
 253         }
 254
 255
 256         /* find/add this frag to store mds delegation info */
 257         frag = __get_or_create_frag(ci, id);
 258         if (IS_ERR(frag)) {
 259                 /* this is not the end of the world; we can continue
 260                    with bad/inaccurate delegation info */
 261                 pr_err("fill_dirfrag ENOMEM on mds ref %llx.%llx fg %x\n",
 262                        ceph_vinop(inode), le32_to_cpu(dirinfo->frag));
 263                 err = -ENOMEM;
 264                 goto out;
 265         }
 266
 267         frag->mds = mds;
 268         frag->ndist = min_t(u32, ndist, CEPH_MAX_DIRFRAG_REP);
 269         for (i = 0; i < frag->ndist; i++)
 270                 frag->dist[i] = le32_to_cpu(dirinfo->dist[i]);
 271         dout("fill_dirfrag %llx.%llx frag %x ndist=%d\n",
 272              ceph_vinop(inode), frag->frag, frag->ndist);
 273
 274 out:
 275         mutex_unlock(&ci->i_fragtree_mutex);
 276         return err;
 277 }
 278
 279
 280 /*
 281  * initialize a newly allocated inode.
 282  */
 283 struct inode *ceph_alloc_inode(struct super_block *sb)
 284 {
 285         struct ceph_inode_info *ci;
 286         int i;
 287
 288         ci = kmem_cache_alloc(ceph_inode_cachep, GFP_NOFS);
 289         if (!ci)
 290                 return NULL;
 291
 292         dout("alloc_inode %p\n", &ci->vfs_inode);
 293
 294         ci->i_version = 0;
 295         ci->i_time_warp_seq = 0;
 296         ci->i_ceph_flags = 0;
 297         ci->i_release_count = 0;
 298         ci->i_symlink = NULL;
 299
 300         memset(&ci->i_dir_layout, 0, sizeof(ci->i_dir_layout));
 301
 302         ci->i_fragtree = RB_ROOT;
 303         mutex_init(&ci->i_fragtree_mutex);
 304
 305         ci->i_xattrs.blob = NULL;
 306         ci->i_xattrs.prealloc_blob = NULL;
 307         ci->i_xattrs.dirty = false;
 308         ci->i_xattrs.index = RB_ROOT;
 309         ci->i_xattrs.count = 0;
 310         ci->i_xattrs.names_size = 0;
 311         ci->i_xattrs.vals_size = 0;
 312         ci->i_xattrs.version = 0;
 313         ci->i_xattrs.index_version = 0;
 314
 315         ci->i_caps = RB_ROOT;
 316         ci->i_auth_cap = NULL;
 317         ci->i_dirty_caps = 0;
 318         ci->i_flushing_caps = 0;
 319         INIT_LIST_HEAD(&ci->i_dirty_item);
 320         INIT_LIST_HEAD(&ci->i_flushing_item);
 321         ci->i_cap_flush_seq = 0;
 322         ci->i_cap_flush_last_tid = 0;
 323         memset(&ci->i_cap_flush_tid, 0, sizeof(ci->i_cap_flush_tid));
 324         init_waitqueue_head(&ci->i_cap_wq);
 325         ci->i_hold_caps_min = 0;
 326         ci->i_hold_caps_max = 0;
 327         INIT_LIST_HEAD(&ci->i_cap_delay_list);
 328         ci->i_cap_exporting_mds = 0;
 329         ci->i_cap_exporting_mseq = 0;
 330         ci->i_cap_exporting_issued = 0;
 331         INIT_LIST_HEAD(&ci->i_cap_snaps);
 332         ci->i_head_snapc = NULL;
 333         ci->i_snap_caps = 0;
 334
 335         for (i = 0; i < CEPH_FILE_MODE_NUM; i++)
 336                 ci->i_nr_by_mode[i] = 0;
 337
 338         ci->i_truncate_seq = 0;
 339         ci->i_truncate_size = 0;
 340         ci->i_truncate_pending = 0;
 341
 342         ci->i_max_size = 0;
 343         ci->i_reported_size = 0;
 344         ci->i_wanted_max_size = 0;
 345         ci->i_requested_max_size = 0;
 346
 347         ci->i_pin_ref = 0;
 348         ci->i_rd_ref = 0;
 349         ci->i_rdcache_ref = 0;
 350         ci->i_wr_ref = 0;
 351         ci->i_wrbuffer_ref = 0;
 352         ci->i_wrbuffer_ref_head = 0;
 353         ci->i_shared_gen = 0;
 354         ci->i_rdcache_gen = 0;
 355         ci->i_rdcache_revoking = 0;
 356
 357         INIT_LIST_HEAD(&ci->i_unsafe_writes);
 358         INIT_LIST_HEAD(&ci->i_unsafe_dirops);
 359         spin_lock_init(&ci->i_unsafe_lock);
 360
 361         ci->i_snap_realm = NULL;
 362         INIT_LIST_HEAD(&ci->i_snap_realm_item);
 363         INIT_LIST_HEAD(&ci->i_snap_flush_item);
 364
 365         INIT_WORK(&ci->i_wb_work, ceph_writeback_work);
 366         INIT_WORK(&ci->i_pg_inv_work, ceph_invalidate_work);
 367
 368         INIT_WORK(&ci->i_vmtruncate_work, ceph_vmtruncate_work);
 369
 370         return &ci->vfs_inode;
 371 }
 372
 373 static void ceph_i_callback(struct rcu_head *head)
 374 {
 375         struct inode *inode = container_of(head, struct inode, i_rcu);
 376         struct ceph_inode_info *ci = ceph_inode(inode);
 377
 378         INIT_LIST_HEAD(&inode->i_dentry);
 379         kmem_cache_free(ceph_inode_cachep, ci);
 380 }
 381
 382 void ceph_destroy_inode(struct inode *inode)
 383 {
 384         struct ceph_inode_info *ci = ceph_inode(inode);
 385         struct ceph_inode_frag *frag;
 386         struct rb_node *n;
 387
 388         dout("destroy_inode %p ino %llx.%llx\n", inode, ceph_vinop(inode));
 389
 390         ceph_queue_caps_release(inode);
 391
 392         /*
 393          * we may still have a snap_realm reference if there are stray
 394          * caps in i_cap_exporting_issued or i_snap_caps.
 395          */
 396         if (ci->i_snap_realm) {
 397                 struct ceph_mds_client *mdsc =
 398                         ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc;
 399                 struct ceph_snap_realm *realm = ci->i_snap_realm;
 400
 401                 dout(" dropping residual ref to snap realm %p\n", realm);
 402                 spin_lock(&realm->inodes_with_caps_lock);
 403                 list_del_init(&ci->i_snap_realm_item);
 404                 spin_unlock(&realm->inodes_with_caps_lock);
 405                 ceph_put_snap_realm(mdsc, realm);
 406         }
 407
 408         kfree(ci->i_symlink);
 409         while ((n = rb_first(&ci->i_fragtree)) != NULL) {
 410                 frag = rb_entry(n, struct ceph_inode_frag, node);
 411                 rb_erase(n, &ci->i_fragtree);
 412                 kfree(frag);
 413         }
 414
 415         __ceph_destroy_xattrs(ci);
 416         if (ci->i_xattrs.blob)
 417                 ceph_buffer_put(ci->i_xattrs.blob);
 418         if (ci->i_xattrs.prealloc_blob)
 419                 ceph_buffer_put(ci->i_xattrs.prealloc_blob);
 420
 421         call_rcu(&inode->i_rcu, ceph_i_callback);
 422 }
 423
 424
 425 /*
 426  * Helpers to fill in size, ctime, mtime, and atime.  We have to be
 427  * careful because either the client or MDS may have more up to date
 428  * info, depending on which capabilities are held, and whether
 429  * time_warp_seq or truncate_seq have increased.  (Ordinarily, mtime
 430  * and size are monotonically increasing, except when utimes() or
 431  * truncate() increments the corresponding _seq values.)
 432  */
 433 int ceph_fill_file_size(struct inode *inode, int issued,
 434                         u32 truncate_seq, u64 truncate_size, u64 size)
 435 {
 436         struct ceph_inode_info *ci = ceph_inode(inode);
 437         int queue_trunc = 0;
 438
 439         if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) > 0 ||
 440             (truncate_seq == ci->i_truncate_seq && size > inode->i_size)) {
 441                 dout("size %lld -> %llu\n", inode->i_size, size);
 442                 inode->i_size = size;
 443                 inode->i_blocks = (size + (1<<9) - 1) >> 9;
 444                 ci->i_reported_size = size;
 445                 if (truncate_seq != ci->i_truncate_seq) {
 446                         dout("truncate_seq %u -> %u\n",
 447                              ci->i_truncate_seq, truncate_seq);
 448                         ci->i_truncate_seq = truncate_seq;
 449                         /*
 450                          * If we hold relevant caps, or in the case where we're
 451                          * not the only client referencing this file and we
 452                          * don't hold those caps, then we need to check whether
 453                          * the file is either opened or mmaped
 454                          */
 455                         if ((issued & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_RD|
 456                                        CEPH_CAP_FILE_WR|CEPH_CAP_FILE_BUFFER|
 457                                        CEPH_CAP_FILE_EXCL|
 458                                        CEPH_CAP_FILE_LAZYIO)) ||
 459                             mapping_mapped(inode->i_mapping) ||
 460                             __ceph_caps_file_wanted(ci)) {
 461                                 ci->i_truncate_pending++;
 462                                 queue_trunc = 1;
 463                         }
 464                 }
 465         }
 466         if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) >= 0 &&
 467             ci->i_truncate_size != truncate_size) {
 468                 dout("truncate_size %lld -> %llu\n", ci->i_truncate_size,
 469                      truncate_size);
 470                 ci->i_truncate_size = truncate_size;
 471         }
 472         return queue_trunc;
 473 }
 474
 475 void ceph_fill_file_time(struct inode *inode, int issued,
 476                          u64 time_warp_seq, struct timespec *ctime,
 477                          struct timespec *mtime, struct timespec *atime)
 478 {
 479         struct ceph_inode_info *ci = ceph_inode(inode);
 480         int warn = 0;
 481
 482         if (issued & (CEPH_CAP_FILE_EXCL|
 483                       CEPH_CAP_FILE_WR|
 484                       CEPH_CAP_FILE_BUFFER|
 485                       CEPH_CAP_AUTH_EXCL|
 486                       CEPH_CAP_XATTR_EXCL)) {
 487                 if (timespec_compare(ctime, &inode->i_ctime) > 0) {
 488                         dout("ctime %ld.%09ld -> %ld.%09ld inc w/ cap\n",
 489                              inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
 490                              ctime->tv_sec, ctime->tv_nsec);
 491                         inode->i_ctime = *ctime;
 492                 }
 493                 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) > 0) {
 494                         /* the MDS did a utimes() */
 495                         dout("mtime %ld.%09ld -> %ld.%09ld "
 496                              "tw %d -> %d\n",
 497                              inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
 498                              mtime->tv_sec, mtime->tv_nsec,
 499                              ci->i_time_warp_seq, (int)time_warp_seq);
 500
 501                         inode->i_mtime = *mtime;
 502                         inode->i_atime = *atime;
 503                         ci->i_time_warp_seq = time_warp_seq;
 504                 } else if (time_warp_seq == ci->i_time_warp_seq) {
 505                         /* nobody did utimes(); take the max */
 506                         if (timespec_compare(mtime, &inode->i_mtime) > 0) {
 507                                 dout("mtime %ld.%09ld -> %ld.%09ld inc\n",
 508                                      inode->i_mtime.tv_sec,
 509                                      inode->i_mtime.tv_nsec,
 510                                      mtime->tv_sec, mtime->tv_nsec);
 511                                 inode->i_mtime = *mtime;
 512                         }
 513                         if (timespec_compare(atime, &inode->i_atime) > 0) {
 514                                 dout("atime %ld.%09ld -> %ld.%09ld inc\n",
 515                                      inode->i_atime.tv_sec,
 516                                      inode->i_atime.tv_nsec,
 517                                      atime->tv_sec, atime->tv_nsec);
 518                                 inode->i_atime = *atime;
 519                         }
 520                 } else if (issued & CEPH_CAP_FILE_EXCL) {
 521                         /* we did a utimes(); ignore mds values */
 522                 } else {
 523                         warn = 1;
 524                 }
 525         } else {
 526                 /* we have no write|excl caps; whatever the MDS says is true */
 527                 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) >= 0) {
 528                         inode->i_ctime = *ctime;
 529                         inode->i_mtime = *mtime;
 530                         inode->i_atime = *atime;
 531                         ci->i_time_warp_seq = time_warp_seq;
 532                 } else {
 533                         warn = 1;
 534                 }
 535         }
 536         if (warn) /* time_warp_seq shouldn't go backwards */
 537                 dout("%p mds time_warp_seq %llu < %u\n",
 538                      inode, time_warp_seq, ci->i_time_warp_seq);
 539 }
 540
 541 /*
 542  * Populate an inode based on info from mds.  May be called on new or
 543  * existing inodes.
 544  */
 545 static int fill_inode(struct inode *inode,
 546                       struct ceph_mds_reply_info_in *iinfo,
 547                       struct ceph_mds_reply_dirfrag *dirinfo,
 548                       struct ceph_mds_session *session,
 549                       unsigned long ttl_from, int cap_fmode,
 550                       struct ceph_cap_reservation *caps_reservation)
 551 {
 552         struct ceph_mds_reply_inode *info = iinfo->in;
 553         struct ceph_inode_info *ci = ceph_inode(inode);
 554         int i;
 555         int issued, implemented;
 556         struct timespec mtime, atime, ctime;
 557         u32 nsplits;
 558         struct ceph_buffer *xattr_blob = NULL;
 559         int err = 0;
 560         int queue_trunc = 0;
 561
 562         dout("fill_inode %p ino %llx.%llx v %llu had %llu\n",
 563              inode, ceph_vinop(inode), le64_to_cpu(info->version),
 564              ci->i_version);
 565
 566         /*
 567          * prealloc xattr data, if it looks like we'll need it.  only
 568          * if len > 4 (meaning there are actually xattrs; the first 4
 569          * bytes are the xattr count).
 570          */
 571         if (iinfo->xattr_len > 4) {
 572                 xattr_blob = ceph_buffer_new(iinfo->xattr_len, GFP_NOFS);
 573                 if (!xattr_blob)
 574                         pr_err("fill_inode ENOMEM xattr blob %d bytes\n",
 575                                iinfo->xattr_len);
 576         }
 577
 578         spin_lock(&inode->i_lock);
 579
 580         /*
 581          * provided version will be odd if inode value is projected,
 582          * even if stable.  skip the update if we have newer stable
 583          * info (ours>=theirs, e.g. due to racing mds replies), unless
 584          * we are getting projected (unstable) info (in which case the
 585          * version is odd, and we want ours>theirs).
 586          *   us   them
 587          *   2    2     skip
 588          *   3    2     skip
 589          *   3    3     update
 590          */
 591         if (le64_to_cpu(info->version) > 0 &&
 592             (ci->i_version & ~1) >= le64_to_cpu(info->version))
 593                 goto no_change;
 594
 595         issued = __ceph_caps_issued(ci, &implemented);
 596         issued |= implemented | __ceph_caps_dirty(ci);
 597
 598         /* update inode */
 599         ci->i_version = le64_to_cpu(info->version);
 600         inode->i_version++;
 601         inode->i_rdev = le32_to_cpu(info->rdev);
 602
 603         if ((issued & CEPH_CAP_AUTH_EXCL) == 0) {
 604                 inode->i_mode = le32_to_cpu(info->mode);
 605                 inode->i_uid = le32_to_cpu(info->uid);
 606                 inode->i_gid = le32_to_cpu(info->gid);
 607                 dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode,
 608                      inode->i_uid, inode->i_gid);
 609         }
 610
 611         if ((issued & CEPH_CAP_LINK_EXCL) == 0)
 612                 inode->i_nlink = le32_to_cpu(info->nlink);
 613
 614         /* be careful with mtime, atime, size */
 615         ceph_decode_timespec(&atime, &info->atime);
 616         ceph_decode_timespec(&mtime, &info->mtime);
 617         ceph_decode_timespec(&ctime, &info->ctime);
 618         queue_trunc = ceph_fill_file_size(inode, issued,
 619                                           le32_to_cpu(info->truncate_seq),
 620                                           le64_to_cpu(info->truncate_size),
 621                                           le64_to_cpu(info->size));
 622         ceph_fill_file_time(inode, issued,
 623                             le32_to_cpu(info->time_warp_seq),
 624                             &ctime, &mtime, &atime);
 625
 626         /* only update max_size on auth cap */
 627         if ((info->cap.flags & CEPH_CAP_FLAG_AUTH) &&
 628             ci->i_max_size != le64_to_cpu(info->max_size)) {
 629                 dout("max_size %lld -> %llu\n", ci->i_max_size,
 630                      le64_to_cpu(info->max_size));
 631                 ci->i_max_size = le64_to_cpu(info->max_size);
 632         }
 633
 634         ci->i_layout = info->layout;
 635         inode->i_blkbits = fls(le32_to_cpu(info->layout.fl_stripe_unit)) - 1;
 636
 637         /* xattrs */
 638         /* note that if i_xattrs.len <= 4, i_xattrs.data will still be NULL. */
 639         if ((issued & CEPH_CAP_XATTR_EXCL) == 0 &&
 640             le64_to_cpu(info->xattr_version) > ci->i_xattrs.version) {
 641                 if (ci->i_xattrs.blob)
 642                         ceph_buffer_put(ci->i_xattrs.blob);
 643                 ci->i_xattrs.blob = xattr_blob;
 644                 if (xattr_blob)
 645                         memcpy(ci->i_xattrs.blob->vec.iov_base,
 646                                iinfo->xattr_data, iinfo->xattr_len);
 647                 ci->i_xattrs.version = le64_to_cpu(info->xattr_version);
 648                 xattr_blob = NULL;
 649         }
 650
 651         inode->i_mapping->a_ops = &ceph_aops;
 652         inode->i_mapping->backing_dev_info =
 653                 &ceph_sb_to_client(inode->i_sb)->backing_dev_info;
 654
 655         switch (inode->i_mode & S_IFMT) {
 656         case S_IFIFO:
 657         case S_IFBLK:
 658         case S_IFCHR:
 659         case S_IFSOCK:
 660                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
 661                 inode->i_op = &ceph_file_iops;
 662                 break;
 663         case S_IFREG:
 664                 inode->i_op = &ceph_file_iops;
 665                 inode->i_fop = &ceph_file_fops;
 666                 break;
 667         case S_IFLNK:
 668                 inode->i_op = &ceph_symlink_iops;
 669                 if (!ci->i_symlink) {
 670                         int symlen = iinfo->symlink_len;
 671                         char *sym;
 672
 673                         BUG_ON(symlen != inode->i_size);
 674                         spin_unlock(&inode->i_lock);
 675
 676                         err = -ENOMEM;
 677                         sym = kmalloc(symlen+1, GFP_NOFS);
 678                         if (!sym)
 679                                 goto out;
 680                         memcpy(sym, iinfo->symlink, symlen);
 681                         sym[symlen] = 0;
 682
 683                         spin_lock(&inode->i_lock);
 684                         if (!ci->i_symlink)
 685                                 ci->i_symlink = sym;
 686                         else
 687                                 kfree(sym); /* lost a race */
 688                 }
 689                 break;
 690         case S_IFDIR:
 691                 inode->i_op = &ceph_dir_iops;
 692                 inode->i_fop = &ceph_dir_fops;
 693
 694                 ci->i_dir_layout = iinfo->dir_layout;
 695
 696                 ci->i_files = le64_to_cpu(info->files);
 697                 ci->i_subdirs = le64_to_cpu(info->subdirs);
 698                 ci->i_rbytes = le64_to_cpu(info->rbytes);
 699                 ci->i_rfiles = le64_to_cpu(info->rfiles);
 700                 ci->i_rsubdirs = le64_to_cpu(info->rsubdirs);
 701                 ceph_decode_timespec(&ci->i_rctime, &info->rctime);
 702
 703                 /* set dir completion flag? */
 704                 if (ci->i_files == 0 && ci->i_subdirs == 0 &&
 705                     ceph_snap(inode) == CEPH_NOSNAP &&
 706                     (le32_to_cpu(info->cap.caps) & CEPH_CAP_FILE_SHARED) &&
 707                     (issued & CEPH_CAP_FILE_EXCL) == 0 &&
 708                     (ci->i_ceph_flags & CEPH_I_COMPLETE) == 0) {
 709                         dout(" marking %p complete (empty)\n", inode);
 710                         ci->i_ceph_flags |= CEPH_I_COMPLETE;
 711                         ci->i_max_offset = 2;
 712                 }
 713
 714                 /* it may be better to set st_size in getattr instead? */
 715                 if (ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb), RBYTES))
 716                         inode->i_size = ci->i_rbytes;
 717                 break;
 718         default:
 719                 pr_err("fill_inode %llx.%llx BAD mode 0%o\n",
 720                        ceph_vinop(inode), inode->i_mode);
 721         }
 722
 723 no_change:
 724         spin_unlock(&inode->i_lock);
 725
 726         /* queue truncate if we saw i_size decrease */
 727         if (queue_trunc)
 728                 ceph_queue_vmtruncate(inode);
 729
 730         /* populate frag tree */
 731         /* FIXME: move me up, if/when version reflects fragtree changes */
 732         nsplits = le32_to_cpu(info->fragtree.nsplits);
 733         mutex_lock(&ci->i_fragtree_mutex);
 734         for (i = 0; i < nsplits; i++) {
 735                 u32 id = le32_to_cpu(info->fragtree.splits[i].frag);
 736                 struct ceph_inode_frag *frag = __get_or_create_frag(ci, id);
 737
 738                 if (IS_ERR(frag))
 739                         continue;
 740                 frag->split_by = le32_to_cpu(info->fragtree.splits[i].by);
 741                 dout(" frag %x split by %d\n", frag->frag, frag->split_by);
 742         }
 743         mutex_unlock(&ci->i_fragtree_mutex);
 744
 745         /* were we issued a capability? */
 746         if (info->cap.caps) {
 747                 if (ceph_snap(inode) == CEPH_NOSNAP) {
 748                         ceph_add_cap(inode, session,
 749                                      le64_to_cpu(info->cap.cap_id),
 750                                      cap_fmode,
 751                                      le32_to_cpu(info->cap.caps),
 752                                      le32_to_cpu(info->cap.wanted),
 753                                      le32_to_cpu(info->cap.seq),
 754                                      le32_to_cpu(info->cap.mseq),
 755                                      le64_to_cpu(info->cap.realm),
 756                                      info->cap.flags,
 757                                      caps_reservation);
 758                 } else {
 759                         spin_lock(&inode->i_lock);
 760                         dout(" %p got snap_caps %s\n", inode,
 761                              ceph_cap_string(le32_to_cpu(info->cap.caps)));
 762                         ci->i_snap_caps |= le32_to_cpu(info->cap.caps);
 763                         if (cap_fmode >= 0)
 764                                 __ceph_get_fmode(ci, cap_fmode);
 765                         spin_unlock(&inode->i_lock);
 766                 }
 767         } else if (cap_fmode >= 0) {
 768                 pr_warning("mds issued no caps on %llx.%llx\n",
 769                            ceph_vinop(inode));
 770                 __ceph_get_fmode(ci, cap_fmode);
 771         }
 772
 773         /* update delegation info? */
 774         if (dirinfo)
 775                 ceph_fill_dirfrag(inode, dirinfo);
 776
 777         err = 0;
 778
 779 out:
 780         if (xattr_blob)
 781                 ceph_buffer_put(xattr_blob);
 782         return err;
 783 }
 784
 785 /*
 786  * caller should hold session s_mutex.
 787  */
 788 static void update_dentry_lease(struct dentry *dentry,
 789                                 struct ceph_mds_reply_lease *lease,
 790                                 struct ceph_mds_session *session,
 791                                 unsigned long from_time)
 792 {
 793         struct ceph_dentry_info *di = ceph_dentry(dentry);
 794         long unsigned duration = le32_to_cpu(lease->duration_ms);
 795         long unsigned ttl = from_time + (duration * HZ) / 1000;
 796         long unsigned half_ttl = from_time + (duration * HZ / 2) / 1000;
 797         struct inode *dir;
 798
 799         /* only track leases on regular dentries */
 800         if (dentry->d_op != &ceph_dentry_ops)
 801                 return;
 802
 803         spin_lock(&dentry->d_lock);
 804         dout("update_dentry_lease %p mask %d duration %lu ms ttl %lu\n",
 805              dentry, le16_to_cpu(lease->mask), duration, ttl);
 806
 807         /* make lease_rdcache_gen match directory */
 808         dir = dentry->d_parent->d_inode;
 809         di->lease_shared_gen = ceph_inode(dir)->i_shared_gen;
 810
 811         if (lease->mask == 0)
 812                 goto out_unlock;
 813
 814         if (di->lease_gen == session->s_cap_gen &&
 815             time_before(ttl, dentry->d_time))
 816                 goto out_unlock;  /* we already have a newer lease. */
 817
 818         if (di->lease_session && di->lease_session != session)
 819                 goto out_unlock;
 820
 821         ceph_dentry_lru_touch(dentry);
 822
 823         if (!di->lease_session)
 824                 di->lease_session = ceph_get_mds_session(session);
 825         di->lease_gen = session->s_cap_gen;
 826         di->lease_seq = le32_to_cpu(lease->seq);
 827         di->lease_renew_after = half_ttl;
 828         di->lease_renew_from = 0;
 829         dentry->d_time = ttl;
 830 out_unlock:
 831         spin_unlock(&dentry->d_lock);
 832         return;
 833 }
 834
 835 /*
 836  * Set dentry's directory position based on the current dir's max, and
 837  * order it in d_subdirs, so that dcache_readdir behaves.
 838  */
 839 static void ceph_set_dentry_offset(struct dentry *dn)
 840 {
 841         struct dentry *dir = dn->d_parent;
 842         struct inode *inode = dn->d_parent->d_inode;
 843         struct ceph_dentry_info *di;
 844
 845         BUG_ON(!inode);
 846
 847         di = ceph_dentry(dn);
 848
 849         spin_lock(&inode->i_lock);
 850         if ((ceph_inode(inode)->i_ceph_flags & CEPH_I_COMPLETE) == 0) {
 851                 spin_unlock(&inode->i_lock);
 852                 return;
 853         }
 854         di->offset = ceph_inode(inode)->i_max_offset++;
 855         spin_unlock(&inode->i_lock);
 856
 857         spin_lock(&dir->d_lock);
 858         spin_lock_nested(&dn->d_lock, DENTRY_D_LOCK_NESTED);
 859         list_move(&dn->d_u.d_child, &dir->d_subdirs);
 860         dout("set_dentry_offset %p %lld (%p %p)\n", dn, di->offset,
 861              dn->d_u.d_child.prev, dn->d_u.d_child.next);
 862         spin_unlock(&dn->d_lock);
 863         spin_unlock(&dir->d_lock);
 864 }
 865
 866 /*
 867  * splice a dentry to an inode.
 868  * caller must hold directory i_mutex for this to be safe.
 869  *
 870  * we will only rehash the resulting dentry if @prehash is
 871  * true; @prehash will be set to false (for the benefit of
 872  * the caller) if we fail.
 873  */
 874 static struct dentry *splice_dentry(struct dentry *dn, struct inode *in,
 875                                     bool *prehash, bool set_offset)
 876 {
 877         struct dentry *realdn;
 878
 879         BUG_ON(dn->d_inode);
 880
 881         /* dn must be unhashed */
 882         if (!d_unhashed(dn))
 883                 d_drop(dn);
 884         realdn = d_materialise_unique(dn, in);
 885         if (IS_ERR(realdn)) {
 886                 pr_err("splice_dentry error %ld %p inode %p ino %llx.%llx\n",
 887                        PTR_ERR(realdn), dn, in, ceph_vinop(in));
 888                 if (prehash)
 889                         *prehash = false; /* don't rehash on error */
 890                 dn = realdn; /* note realdn contains the error */
 891                 goto out;
 892         } else if (realdn) {
 893                 dout("dn %p (%d) spliced with %p (%d) "
 894                      "inode %p ino %llx.%llx\n",
 895                      dn, dn->d_count,
 896                      realdn, realdn->d_count,
 897                      realdn->d_inode, ceph_vinop(realdn->d_inode));
 898                 dput(dn);
 899                 dn = realdn;
 900         } else {
 901                 BUG_ON(!ceph_dentry(dn));
 902                 dout("dn %p attached to %p ino %llx.%llx\n",
 903                      dn, dn->d_inode, ceph_vinop(dn->d_inode));
 904         }
 905         if ((!prehash || *prehash) && d_unhashed(dn))
 906                 d_rehash(dn);
 907         if (set_offset)
 908                 ceph_set_dentry_offset(dn);
 909 out:
 910         return dn;
 911 }
 912
 913 /*
 914  * Incorporate results into the local cache.  This is either just
 915  * one inode, or a directory, dentry, and possibly linked-to inode (e.g.,
 916  * after a lookup).
 917  *
 918  * A reply may contain
 919  *         a directory inode along with a dentry.
 920  *  and/or a target inode
 921  *
 922  * Called with snap_rwsem (read).
 923  */
 924 int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req,
 925                     struct ceph_mds_session *session)
 926 {
 927         struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
 928         struct inode *in = NULL;
 929         struct ceph_mds_reply_inode *ininfo;
 930         struct ceph_vino vino;
 931         struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
 932         int i = 0;
 933         int err = 0;
 934
 935         dout("fill_trace %p is_dentry %d is_target %d\n", req,
 936              rinfo->head->is_dentry, rinfo->head->is_target);
 937
 938 #if 0
 939         /*
 940          * Debugging hook:
 941          *
 942          * If we resend completed ops to a recovering mds, we get no
 943          * trace.  Since that is very rare, pretend this is the case
 944          * to ensure the 'no trace' handlers in the callers behave.
 945          *
 946          * Fill in inodes unconditionally to avoid breaking cap
 947          * invariants.
 948          */
 949         if (rinfo->head->op & CEPH_MDS_OP_WRITE) {
 950                 pr_info("fill_trace faking empty trace on %lld %s\n",
 951                         req->r_tid, ceph_mds_op_name(rinfo->head->op));
 952                 if (rinfo->head->is_dentry) {
 953                         rinfo->head->is_dentry = 0;
 954                         err = fill_inode(req->r_locked_dir,
 955                                          &rinfo->diri, rinfo->dirfrag,
 956                                          session, req->r_request_started, -1);
 957                 }
 958                 if (rinfo->head->is_target) {
 959                         rinfo->head->is_target = 0;
 960                         ininfo = rinfo->targeti.in;
 961                         vino.ino = le64_to_cpu(ininfo->ino);
 962                         vino.snap = le64_to_cpu(ininfo->snapid);
 963                         in = ceph_get_inode(sb, vino);
 964                         err = fill_inode(in, &rinfo->targeti, NULL,
 965                                          session, req->r_request_started,
 966                                          req->r_fmode);
 967                         iput(in);
 968                 }
 969         }
 970 #endif
 971
 972         if (!rinfo->head->is_target && !rinfo->head->is_dentry) {
 973                 dout("fill_trace reply is empty!\n");
 974                 if (rinfo->head->result == 0 && req->r_locked_dir)
 975                         ceph_invalidate_dir_request(req);
 976                 return 0;
 977         }
 978
 979         if (rinfo->head->is_dentry) {
 980                 struct inode *dir = req->r_locked_dir;
 981
 982                 err = fill_inode(dir, &rinfo->diri, rinfo->dirfrag,
 983                                  session, req->r_request_started, -1,
 984                                  &req->r_caps_reservation);
 985                 if (err < 0)
 986                         return err;
 987         }
 988
 989         /*
 990          * ignore null lease/binding on snapdir ENOENT, or else we
 991          * will have trouble splicing in the virtual snapdir later
 992          */
 993         if (rinfo->head->is_dentry && !req->r_aborted &&
 994             (rinfo->head->is_target || strncmp(req->r_dentry->d_name.name,
 995                                                fsc->mount_options->snapdir_name,
 996                                                req->r_dentry->d_name.len))) {
 997                 /*
 998                  * lookup link rename   : null -> possibly existing inode
 999                  * mknod symlink mkdir  : null -> new inode
1000                  * unlink               : linked -> null
1001                  */
1002                 struct inode *dir = req->r_locked_dir;
1003                 struct dentry *dn = req->r_dentry;
1004                 bool have_dir_cap, have_lease;
1005
1006                 BUG_ON(!dn);
1007                 BUG_ON(!dir);
1008                 BUG_ON(dn->d_parent->d_inode != dir);
1009                 BUG_ON(ceph_ino(dir) !=
1010                        le64_to_cpu(rinfo->diri.in->ino));
1011                 BUG_ON(ceph_snap(dir) !=
1012                        le64_to_cpu(rinfo->diri.in->snapid));
1013
1014                 /* do we have a lease on the whole dir? */
1015                 have_dir_cap =
1016                         (le32_to_cpu(rinfo->diri.in->cap.caps) &
1017                          CEPH_CAP_FILE_SHARED);
1018
1019                 /* do we have a dn lease? */
1020                 have_lease = have_dir_cap ||
1021                         (le16_to_cpu(rinfo->dlease->mask) &
1022                          CEPH_LOCK_DN);
1023
1024                 if (!have_lease)
1025                         dout("fill_trace  no dentry lease or dir cap\n");
1026
1027                 /* rename? */
1028                 if (req->r_old_dentry && req->r_op == CEPH_MDS_OP_RENAME) {
1029                         dout(" src %p '%.*s' dst %p '%.*s'\n",
1030                              req->r_old_dentry,
1031                              req->r_old_dentry->d_name.len,
1032                              req->r_old_dentry->d_name.name,
1033                              dn, dn->d_name.len, dn->d_name.name);
1034                         dout("fill_trace doing d_move %p -> %p\n",
1035                              req->r_old_dentry, dn);
1036
1037                         /* d_move screws up d_subdirs order */
1038                         ceph_i_clear(dir, CEPH_I_COMPLETE);
1039
1040                         d_move(req->r_old_dentry, dn);
1041                         dout(" src %p '%.*s' dst %p '%.*s'\n",
1042                              req->r_old_dentry,
1043                              req->r_old_dentry->d_name.len,
1044                              req->r_old_dentry->d_name.name,
1045                              dn, dn->d_name.len, dn->d_name.name);
1046
1047                         /* ensure target dentry is invalidated, despite
1048                            rehashing bug in vfs_rename_dir */
1049                         ceph_invalidate_dentry_lease(dn);
1050
1051                         /* take overwritten dentry's readdir offset */
1052                         dout("dn %p gets %p offset %lld (old offset %lld)\n",
1053                              req->r_old_dentry, dn, ceph_dentry(dn)->offset,
1054                              ceph_dentry(req->r_old_dentry)->offset);
1055                         ceph_dentry(req->r_old_dentry)->offset =
1056                                 ceph_dentry(dn)->offset;
1057
1058                         dn = req->r_old_dentry;  /* use old_dentry */
1059                         in = dn->d_inode;
1060                 }
1061
1062                 /* null dentry? */
1063                 if (!rinfo->head->is_target) {
1064                         dout("fill_trace null dentry\n");
1065                         if (dn->d_inode) {
1066                                 dout("d_delete %p\n", dn);
1067                                 d_delete(dn);
1068                         } else {
1069                                 dout("d_instantiate %p NULL\n", dn);
1070                                 d_instantiate(dn, NULL);
1071                                 if (have_lease && d_unhashed(dn))
1072                                         d_rehash(dn);
1073                                 update_dentry_lease(dn, rinfo->dlease,
1074                                                     session,
1075                                                     req->r_request_started);
1076                         }
1077                         goto done;
1078                 }
1079
1080                 /* attach proper inode */
1081                 ininfo = rinfo->targeti.in;
1082                 vino.ino = le64_to_cpu(ininfo->ino);
1083                 vino.snap = le64_to_cpu(ininfo->snapid);
1084                 in = dn->d_inode;
1085                 if (!in) {
1086                         in = ceph_get_inode(sb, vino);
1087                         if (IS_ERR(in)) {
1088                                 pr_err("fill_trace bad get_inode "
1089                                        "%llx.%llx\n", vino.ino, vino.snap);
1090                                 err = PTR_ERR(in);
1091                                 d_delete(dn);
1092                                 goto done;
1093                         }
1094                         dn = splice_dentry(dn, in, &have_lease, true);
1095                         if (IS_ERR(dn)) {
1096                                 err = PTR_ERR(dn);
1097                                 goto done;
1098                         }
1099                         req->r_dentry = dn;  /* may have spliced */
1100                         igrab(in);
1101                 } else if (ceph_ino(in) == vino.ino &&
1102                            ceph_snap(in) == vino.snap) {
1103                         igrab(in);
1104                 } else {
1105                         dout(" %p links to %p %llx.%llx, not %llx.%llx\n",
1106                              dn, in, ceph_ino(in), ceph_snap(in),
1107                              vino.ino, vino.snap);
1108                         have_lease = false;
1109                         in = NULL;
1110                 }
1111
1112                 if (have_lease)
1113                         update_dentry_lease(dn, rinfo->dlease, session,
1114                                             req->r_request_started);
1115                 dout(" final dn %p\n", dn);
1116                 i++;
1117         } else if (req->r_op == CEPH_MDS_OP_LOOKUPSNAP ||
1118                    req->r_op == CEPH_MDS_OP_MKSNAP) {
1119                 struct dentry *dn = req->r_dentry;
1120
1121                 /* fill out a snapdir LOOKUPSNAP dentry */
1122                 BUG_ON(!dn);
1123                 BUG_ON(!req->r_locked_dir);
1124                 BUG_ON(ceph_snap(req->r_locked_dir) != CEPH_SNAPDIR);
1125                 ininfo = rinfo->targeti.in;
1126                 vino.ino = le64_to_cpu(ininfo->ino);
1127                 vino.snap = le64_to_cpu(ininfo->snapid);
1128                 in = ceph_get_inode(sb, vino);
1129                 if (IS_ERR(in)) {
1130                         pr_err("fill_inode get_inode badness %llx.%llx\n",
1131                                vino.ino, vino.snap);
1132                         err = PTR_ERR(in);
1133                         d_delete(dn);
1134                         goto done;
1135                 }
1136                 dout(" linking snapped dir %p to dn %p\n", in, dn);
1137                 dn = splice_dentry(dn, in, NULL, true);
1138                 if (IS_ERR(dn)) {
1139                         err = PTR_ERR(dn);
1140                         goto done;
1141                 }
1142                 req->r_dentry = dn;  /* may have spliced */
1143                 igrab(in);
1144                 rinfo->head->is_dentry = 1;  /* fool notrace handlers */
1145         }
1146
1147         if (rinfo->head->is_target) {
1148                 vino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1149                 vino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1150
1151                 if (in == NULL || ceph_ino(in) != vino.ino ||
1152                     ceph_snap(in) != vino.snap) {
1153                         in = ceph_get_inode(sb, vino);
1154                         if (IS_ERR(in)) {
1155                                 err = PTR_ERR(in);
1156                                 goto done;
1157                         }
1158                 }
1159                 req->r_target_inode = in;
1160
1161                 err = fill_inode(in,
1162                                  &rinfo->targeti, NULL,
1163                                  session, req->r_request_started,
1164                                  (le32_to_cpu(rinfo->head->result) == 0) ?
1165                                  req->r_fmode : -1,
1166                                  &req->r_caps_reservation);
1167                 if (err < 0) {
1168                         pr_err("fill_inode badness %p %llx.%llx\n",
1169                                in, ceph_vinop(in));
1170                         goto done;
1171                 }
1172         }
1173
1174 done:
1175         dout("fill_trace done err=%d\n", err);
1176         return err;
1177 }
1178
1179 /*
1180  * Prepopulate our cache with readdir results, leases, etc.
1181  */
1182 int ceph_readdir_prepopulate(struct ceph_mds_request *req,
1183                              struct ceph_mds_session *session)
1184 {
1185         struct dentry *parent = req->r_dentry;
1186         struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1187         struct qstr dname;
1188         struct dentry *dn;
1189         struct inode *in;
1190         int err = 0, i;
1191         struct inode *snapdir = NULL;
1192         struct ceph_mds_request_head *rhead = req->r_request->front.iov_base;
1193         u64 frag = le32_to_cpu(rhead->args.readdir.frag);
1194         struct ceph_dentry_info *di;
1195
1196         if (le32_to_cpu(rinfo->head->op) == CEPH_MDS_OP_LSSNAP) {
1197                 snapdir = ceph_get_snapdir(parent->d_inode);
1198                 parent = d_find_alias(snapdir);
1199                 dout("readdir_prepopulate %d items under SNAPDIR dn %p\n",
1200                      rinfo->dir_nr, parent);
1201         } else {
1202                 dout("readdir_prepopulate %d items under dn %p\n",
1203                      rinfo->dir_nr, parent);
1204                 if (rinfo->dir_dir)
1205                         ceph_fill_dirfrag(parent->d_inode, rinfo->dir_dir);
1206         }
1207
1208         for (i = 0; i < rinfo->dir_nr; i++) {
1209                 struct ceph_vino vino;
1210
1211                 dname.name = rinfo->dir_dname[i];
1212                 dname.len = rinfo->dir_dname_len[i];
1213                 dname.hash = full_name_hash(dname.name, dname.len);
1214
1215                 vino.ino = le64_to_cpu(rinfo->dir_in[i].in->ino);
1216                 vino.snap = le64_to_cpu(rinfo->dir_in[i].in->snapid);
1217
1218 retry_lookup:
1219                 dn = d_lookup(parent, &dname);
1220                 dout("d_lookup on parent=%p name=%.*s got %p\n",
1221                      parent, dname.len, dname.name, dn);
1222
1223                 if (!dn) {
1224                         dn = d_alloc(parent, &dname);
1225                         dout("d_alloc %p '%.*s' = %p\n", parent,
1226                              dname.len, dname.name, dn);
1227                         if (dn == NULL) {
1228                                 dout("d_alloc badness\n");
1229                                 err = -ENOMEM;
1230                                 goto out;
1231                         }
1232                         err = ceph_init_dentry(dn);
1233                         if (err < 0) {
1234                                 dput(dn);
1235                                 goto out;
1236                         }
1237                 } else if (dn->d_inode &&
1238                            (ceph_ino(dn->d_inode) != vino.ino ||
1239                             ceph_snap(dn->d_inode) != vino.snap)) {
1240                         dout(" dn %p points to wrong inode %p\n",
1241                              dn, dn->d_inode);
1242                         d_delete(dn);
1243                         dput(dn);
1244                         goto retry_lookup;
1245                 } else {
1246                         /* reorder parent's d_subdirs */
1247                         spin_lock(&parent->d_lock);
1248                         spin_lock_nested(&dn->d_lock, DENTRY_D_LOCK_NESTED);
1249                         list_move(&dn->d_u.d_child, &parent->d_subdirs);
1250                         spin_unlock(&dn->d_lock);
1251                         spin_unlock(&parent->d_lock);
1252                 }
1253
1254                 di = dn->d_fsdata;
1255                 di->offset = ceph_make_fpos(frag, i + req->r_readdir_offset);
1256
1257                 /* inode */
1258                 if (dn->d_inode) {
1259                         in = dn->d_inode;
1260                 } else {
1261                         in = ceph_get_inode(parent->d_sb, vino);
1262                         if (IS_ERR(in)) {
1263                                 dout("new_inode badness\n");
1264                                 d_delete(dn);
1265                                 dput(dn);
1266                                 err = PTR_ERR(in);
1267                                 goto out;
1268                         }
1269                         dn = splice_dentry(dn, in, NULL, false);
1270                         if (IS_ERR(dn))
1271                                 dn = NULL;
1272                 }
1273
1274                 if (fill_inode(in, &rinfo->dir_in[i], NULL, session,
1275                                req->r_request_started, -1,
1276                                &req->r_caps_reservation) < 0) {
1277                         pr_err("fill_inode badness on %p\n", in);
1278                         goto next_item;
1279                 }
1280                 if (dn)
1281                         update_dentry_lease(dn, rinfo->dir_dlease[i],
1282                                             req->r_session,
1283                                             req->r_request_started);
1284 next_item:
1285                 if (dn)
1286                         dput(dn);
1287         }
1288         req->r_did_prepopulate = true;
1289
1290 out:
1291         if (snapdir) {
1292                 iput(snapdir);
1293                 dput(parent);
1294         }
1295         dout("readdir_prepopulate done\n");
1296         return err;
1297 }
1298
1299 int ceph_inode_set_size(struct inode *inode, loff_t size)
1300 {
1301         struct ceph_inode_info *ci = ceph_inode(inode);
1302         int ret = 0;
1303
1304         spin_lock(&inode->i_lock);
1305         dout("set_size %p %llu -> %llu\n", inode, inode->i_size, size);
1306         inode->i_size = size;
1307         inode->i_blocks = (size + (1 << 9) - 1) >> 9;
1308
1309         /* tell the MDS if we are approaching max_size */
1310         if ((size << 1) >= ci->i_max_size &&
1311             (ci->i_reported_size << 1) < ci->i_max_size)
1312                 ret = 1;
1313
1314         spin_unlock(&inode->i_lock);
1315         return ret;
1316 }
1317
1318 /*
1319  * Write back inode data in a worker thread.  (This can't be done
1320  * in the message handler context.)
1321  */
1322 void ceph_queue_writeback(struct inode *inode)
1323 {
1324         if (queue_work(ceph_inode_to_client(inode)->wb_wq,
1325                        &ceph_inode(inode)->i_wb_work)) {
1326                 dout("ceph_queue_writeback %p\n", inode);
1327                 igrab(inode);
1328         } else {
1329                 dout("ceph_queue_writeback %p failed\n", inode);
1330         }
1331 }
1332
1333 static void ceph_writeback_work(struct work_struct *work)
1334 {
1335         struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1336                                                   i_wb_work);
1337         struct inode *inode = &ci->vfs_inode;
1338
1339         dout("writeback %p\n", inode);
1340         filemap_fdatawrite(&inode->i_data);
1341         iput(inode);
1342 }
1343
1344 /*
1345  * queue an async invalidation
1346  */
1347 void ceph_queue_invalidate(struct inode *inode)
1348 {
1349         if (queue_work(ceph_inode_to_client(inode)->pg_inv_wq,
1350                        &ceph_inode(inode)->i_pg_inv_work)) {
1351                 dout("ceph_queue_invalidate %p\n", inode);
1352                 igrab(inode);
1353         } else {
1354                 dout("ceph_queue_invalidate %p failed\n", inode);
1355         }
1356 }
1357
1358 /*
1359  * invalidate any pages that are not dirty or under writeback.  this
1360  * includes pages that are clean and mapped.
1361  */
1362 static void ceph_invalidate_nondirty_pages(struct address_space *mapping)
1363 {
1364         struct pagevec pvec;
1365         pgoff_t next = 0;
1366         int i;
1367
1368         pagevec_init(&pvec, 0);
1369         while (pagevec_lookup(&pvec, mapping, next, PAGEVEC_SIZE)) {
1370                 for (i = 0; i < pagevec_count(&pvec); i++) {
1371                         struct page *page = pvec.pages[i];
1372                         pgoff_t index;
1373                         int skip_page =
1374                                 (PageDirty(page) || PageWriteback(page));
1375
1376                         if (!skip_page)
1377                                 skip_page = !trylock_page(page);
1378
1379                         /*
1380                          * We really shouldn't be looking at the ->index of an
1381                          * unlocked page.  But we're not allowed to lock these
1382                          * pages.  So we rely upon nobody altering the ->index
1383                          * of this (pinned-by-us) page.
1384                          */
1385                         index = page->index;
1386                         if (index > next)
1387                                 next = index;
1388                         next++;
1389
1390                         if (skip_page)
1391                                 continue;
1392
1393                         generic_error_remove_page(mapping, page);
1394                         unlock_page(page);
1395                 }
1396                 pagevec_release(&pvec);
1397                 cond_resched();
1398         }
1399 }
1400
1401 /*
1402  * Invalidate inode pages in a worker thread.  (This can't be done
1403  * in the message handler context.)
1404  */
1405 static void ceph_invalidate_work(struct work_struct *work)
1406 {
1407         struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1408                                                   i_pg_inv_work);
1409         struct inode *inode = &ci->vfs_inode;
1410         u32 orig_gen;
1411         int check = 0;
1412
1413         spin_lock(&inode->i_lock);
1414         dout("invalidate_pages %p gen %d revoking %d\n", inode,
1415              ci->i_rdcache_gen, ci->i_rdcache_revoking);
1416         if (ci->i_rdcache_revoking != ci->i_rdcache_gen) {
1417                 /* nevermind! */
1418                 spin_unlock(&inode->i_lock);
1419                 goto out;
1420         }
1421         orig_gen = ci->i_rdcache_gen;
1422         spin_unlock(&inode->i_lock);
1423
1424         ceph_invalidate_nondirty_pages(inode->i_mapping);
1425
1426         spin_lock(&inode->i_lock);
1427         if (orig_gen == ci->i_rdcache_gen &&
1428             orig_gen == ci->i_rdcache_revoking) {
1429                 dout("invalidate_pages %p gen %d successful\n", inode,
1430                      ci->i_rdcache_gen);
1431                 ci->i_rdcache_revoking--;
1432                 check = 1;
1433         } else {
1434                 dout("invalidate_pages %p gen %d raced, now %d revoking %d\n",
1435                      inode, orig_gen, ci->i_rdcache_gen,
1436                      ci->i_rdcache_revoking);
1437         }
1438         spin_unlock(&inode->i_lock);
1439
1440         if (check)
1441                 ceph_check_caps(ci, 0, NULL);
1442 out:
1443         iput(inode);
1444 }
1445
1446
1447 /*
1448  * called by trunc_wq; take i_mutex ourselves
1449  *
1450  * We also truncate in a separate thread as well.
1451  */
1452 static void ceph_vmtruncate_work(struct work_struct *work)
1453 {
1454         struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1455                                                   i_vmtruncate_work);
1456         struct inode *inode = &ci->vfs_inode;
1457
1458         dout("vmtruncate_work %p\n", inode);
1459         mutex_lock(&inode->i_mutex);
1460         __ceph_do_pending_vmtruncate(inode);
1461         mutex_unlock(&inode->i_mutex);
1462         iput(inode);
1463 }
1464
1465 /*
1466  * Queue an async vmtruncate.  If we fail to queue work, we will handle
1467  * the truncation the next time we call __ceph_do_pending_vmtruncate.
1468  */
1469 void ceph_queue_vmtruncate(struct inode *inode)
1470 {
1471         struct ceph_inode_info *ci = ceph_inode(inode);
1472
1473         if (queue_work(ceph_sb_to_client(inode->i_sb)->trunc_wq,
1474                        &ci->i_vmtruncate_work)) {
1475                 dout("ceph_queue_vmtruncate %p\n", inode);
1476                 igrab(inode);
1477         } else {
1478                 dout("ceph_queue_vmtruncate %p failed, pending=%d\n",
1479                      inode, ci->i_truncate_pending);
1480         }
1481 }
1482
1483 /*
1484  * called with i_mutex held.
1485  *
1486  * Make sure any pending truncation is applied before doing anything
1487  * that may depend on it.
1488  */
1489 void __ceph_do_pending_vmtruncate(struct inode *inode)
1490 {
1491         struct ceph_inode_info *ci = ceph_inode(inode);
1492         u64 to;
1493         int wrbuffer_refs, wake = 0;
1494
1495 retry:
1496         spin_lock(&inode->i_lock);
1497         if (ci->i_truncate_pending == 0) {
1498                 dout("__do_pending_vmtruncate %p none pending\n", inode);
1499                 spin_unlock(&inode->i_lock);
1500                 return;
1501         }
1502
1503         /*
1504          * make sure any dirty snapped pages are flushed before we
1505          * possibly truncate them.. so write AND block!
1506          */
1507         if (ci->i_wrbuffer_ref_head < ci->i_wrbuffer_ref) {
1508                 dout("__do_pending_vmtruncate %p flushing snaps first\n",
1509                      inode);
1510                 spin_unlock(&inode->i_lock);
1511                 filemap_write_and_wait_range(&inode->i_data, 0,
1512                                              inode->i_sb->s_maxbytes);
1513                 goto retry;
1514         }
1515
1516         to = ci->i_truncate_size;
1517         wrbuffer_refs = ci->i_wrbuffer_ref;
1518         dout("__do_pending_vmtruncate %p (%d) to %lld\n", inode,
1519              ci->i_truncate_pending, to);
1520         spin_unlock(&inode->i_lock);
1521
1522         truncate_inode_pages(inode->i_mapping, to);
1523
1524         spin_lock(&inode->i_lock);
1525         ci->i_truncate_pending--;
1526         if (ci->i_truncate_pending == 0)
1527                 wake = 1;
1528         spin_unlock(&inode->i_lock);
1529
1530         if (wrbuffer_refs == 0)
1531                 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
1532         if (wake)
1533                 wake_up_all(&ci->i_cap_wq);
1534 }
1535
1536
1537 /*
1538  * symlinks
1539  */
1540 static void *ceph_sym_follow_link(struct dentry *dentry, struct nameidata *nd)
1541 {
1542         struct ceph_inode_info *ci = ceph_inode(dentry->d_inode);
1543         nd_set_link(nd, ci->i_symlink);
1544         return NULL;
1545 }
1546
1547 static const struct inode_operations ceph_symlink_iops = {
1548         .readlink = generic_readlink,
1549         .follow_link = ceph_sym_follow_link,
1550 };
1551
1552 /*
1553  * setattr
1554  */
1555 int ceph_setattr(struct dentry *dentry, struct iattr *attr)
1556 {
1557         struct inode *inode = dentry->d_inode;
1558         struct ceph_inode_info *ci = ceph_inode(inode);
1559         struct inode *parent_inode = dentry->d_parent->d_inode;
1560         const unsigned int ia_valid = attr->ia_valid;
1561         struct ceph_mds_request *req;
1562         struct ceph_mds_client *mdsc = ceph_sb_to_client(dentry->d_sb)->mdsc;
1563         int issued;
1564         int release = 0, dirtied = 0;
1565         int mask = 0;
1566         int err = 0;
1567
1568         if (ceph_snap(inode) != CEPH_NOSNAP)
1569                 return -EROFS;
1570
1571         __ceph_do_pending_vmtruncate(inode);
1572
1573         err = inode_change_ok(inode, attr);
1574         if (err != 0)
1575                 return err;
1576
1577         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETATTR,
1578                                        USE_AUTH_MDS);
1579         if (IS_ERR(req))
1580                 return PTR_ERR(req);
1581
1582         spin_lock(&inode->i_lock);
1583         issued = __ceph_caps_issued(ci, NULL);
1584         dout("setattr %p issued %s\n", inode, ceph_cap_string(issued));
1585
1586         if (ia_valid & ATTR_UID) {
1587                 dout("setattr %p uid %d -> %d\n", inode,
1588                      inode->i_uid, attr->ia_uid);
1589                 if (issued & CEPH_CAP_AUTH_EXCL) {
1590                         inode->i_uid = attr->ia_uid;
1591                         dirtied |= CEPH_CAP_AUTH_EXCL;
1592                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1593                            attr->ia_uid != inode->i_uid) {
1594                         req->r_args.setattr.uid = cpu_to_le32(attr->ia_uid);
1595                         mask |= CEPH_SETATTR_UID;
1596                         release |= CEPH_CAP_AUTH_SHARED;
1597                 }
1598         }
1599         if (ia_valid & ATTR_GID) {
1600                 dout("setattr %p gid %d -> %d\n", inode,
1601                      inode->i_gid, attr->ia_gid);
1602                 if (issued & CEPH_CAP_AUTH_EXCL) {
1603                         inode->i_gid = attr->ia_gid;
1604                         dirtied |= CEPH_CAP_AUTH_EXCL;
1605                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1606                            attr->ia_gid != inode->i_gid) {
1607                         req->r_args.setattr.gid = cpu_to_le32(attr->ia_gid);
1608                         mask |= CEPH_SETATTR_GID;
1609                         release |= CEPH_CAP_AUTH_SHARED;
1610                 }
1611         }
1612         if (ia_valid & ATTR_MODE) {
1613                 dout("setattr %p mode 0%o -> 0%o\n", inode, inode->i_mode,
1614                      attr->ia_mode);
1615                 if (issued & CEPH_CAP_AUTH_EXCL) {
1616                         inode->i_mode = attr->ia_mode;
1617                         dirtied |= CEPH_CAP_AUTH_EXCL;
1618                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1619                            attr->ia_mode != inode->i_mode) {
1620                         req->r_args.setattr.mode = cpu_to_le32(attr->ia_mode);
1621                         mask |= CEPH_SETATTR_MODE;
1622                         release |= CEPH_CAP_AUTH_SHARED;
1623                 }
1624         }
1625
1626         if (ia_valid & ATTR_ATIME) {
1627                 dout("setattr %p atime %ld.%ld -> %ld.%ld\n", inode,
1628                      inode->i_atime.tv_sec, inode->i_atime.tv_nsec,
1629                      attr->ia_atime.tv_sec, attr->ia_atime.tv_nsec);
1630                 if (issued & CEPH_CAP_FILE_EXCL) {
1631                         ci->i_time_warp_seq++;
1632                         inode->i_atime = attr->ia_atime;
1633                         dirtied |= CEPH_CAP_FILE_EXCL;
1634                 } else if ((issued & CEPH_CAP_FILE_WR) &&
1635                            timespec_compare(&inode->i_atime,
1636                                             &attr->ia_atime) < 0) {
1637                         inode->i_atime = attr->ia_atime;
1638                         dirtied |= CEPH_CAP_FILE_WR;
1639                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1640                            !timespec_equal(&inode->i_atime, &attr->ia_atime)) {
1641                         ceph_encode_timespec(&req->r_args.setattr.atime,
1642                                              &attr->ia_atime);
1643                         mask |= CEPH_SETATTR_ATIME;
1644                         release |= CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_RD |
1645                                 CEPH_CAP_FILE_WR;
1646                 }
1647         }
1648         if (ia_valid & ATTR_MTIME) {
1649                 dout("setattr %p mtime %ld.%ld -> %ld.%ld\n", inode,
1650                      inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
1651                      attr->ia_mtime.tv_sec, attr->ia_mtime.tv_nsec);
1652                 if (issued & CEPH_CAP_FILE_EXCL) {
1653                         ci->i_time_warp_seq++;
1654                         inode->i_mtime = attr->ia_mtime;
1655                         dirtied |= CEPH_CAP_FILE_EXCL;
1656                 } else if ((issued & CEPH_CAP_FILE_WR) &&
1657                            timespec_compare(&inode->i_mtime,
1658                                             &attr->ia_mtime) < 0) {
1659                         inode->i_mtime = attr->ia_mtime;
1660                         dirtied |= CEPH_CAP_FILE_WR;
1661                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1662                            !timespec_equal(&inode->i_mtime, &attr->ia_mtime)) {
1663                         ceph_encode_timespec(&req->r_args.setattr.mtime,
1664                                              &attr->ia_mtime);
1665                         mask |= CEPH_SETATTR_MTIME;
1666                         release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD |
1667                                 CEPH_CAP_FILE_WR;
1668                 }
1669         }
1670         if (ia_valid & ATTR_SIZE) {
1671                 dout("setattr %p size %lld -> %lld\n", inode,
1672                      inode->i_size, attr->ia_size);
1673                 if (attr->ia_size > inode->i_sb->s_maxbytes) {
1674                         err = -EINVAL;
1675                         goto out;
1676                 }
1677                 if ((issued & CEPH_CAP_FILE_EXCL) &&
1678                     attr->ia_size > inode->i_size) {
1679                         inode->i_size = attr->ia_size;
1680                         inode->i_blocks =
1681                                 (attr->ia_size + (1 << 9) - 1) >> 9;
1682                         inode->i_ctime = attr->ia_ctime;
1683                         ci->i_reported_size = attr->ia_size;
1684                         dirtied |= CEPH_CAP_FILE_EXCL;
1685                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1686                            attr->ia_size != inode->i_size) {
1687                         req->r_args.setattr.size = cpu_to_le64(attr->ia_size);
1688                         req->r_args.setattr.old_size =
1689                                 cpu_to_le64(inode->i_size);
1690                         mask |= CEPH_SETATTR_SIZE;
1691                         release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD |
1692                                 CEPH_CAP_FILE_WR;
1693                 }
1694         }
1695
1696         /* these do nothing */
1697         if (ia_valid & ATTR_CTIME) {
1698                 bool only = (ia_valid & (ATTR_SIZE|ATTR_MTIME|ATTR_ATIME|
1699                                          ATTR_MODE|ATTR_UID|ATTR_GID)) == 0;
1700                 dout("setattr %p ctime %ld.%ld -> %ld.%ld (%s)\n", inode,
1701                      inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
1702                      attr->ia_ctime.tv_sec, attr->ia_ctime.tv_nsec,
1703                      only ? "ctime only" : "ignored");
1704                 inode->i_ctime = attr->ia_ctime;
1705                 if (only) {
1706                         /*
1707                          * if kernel wants to dirty ctime but nothing else,
1708                          * we need to choose a cap to dirty under, or do
1709                          * a almost-no-op setattr
1710                          */
1711                         if (issued & CEPH_CAP_AUTH_EXCL)
1712                                 dirtied |= CEPH_CAP_AUTH_EXCL;
1713                         else if (issued & CEPH_CAP_FILE_EXCL)
1714                                 dirtied |= CEPH_CAP_FILE_EXCL;
1715                         else if (issued & CEPH_CAP_XATTR_EXCL)
1716                                 dirtied |= CEPH_CAP_XATTR_EXCL;
1717                         else
1718                                 mask |= CEPH_SETATTR_CTIME;
1719                 }
1720         }
1721         if (ia_valid & ATTR_FILE)
1722                 dout("setattr %p ATTR_FILE ... hrm!\n", inode);
1723
1724         if (dirtied) {
1725                 __ceph_mark_dirty_caps(ci, dirtied);
1726                 inode->i_ctime = CURRENT_TIME;
1727         }
1728
1729         release &= issued;
1730         spin_unlock(&inode->i_lock);
1731
1732         if (mask) {
1733                 req->r_inode = igrab(inode);
1734                 req->r_inode_drop = release;
1735                 req->r_args.setattr.mask = cpu_to_le32(mask);
1736                 req->r_num_caps = 1;
1737                 err = ceph_mdsc_do_request(mdsc, parent_inode, req);
1738         }
1739         dout("setattr %p result=%d (%s locally, %d remote)\n", inode, err,
1740              ceph_cap_string(dirtied), mask);
1741
1742         ceph_mdsc_put_request(req);
1743         __ceph_do_pending_vmtruncate(inode);
1744         return err;
1745 out:
1746         spin_unlock(&inode->i_lock);
1747         ceph_mdsc_put_request(req);
1748         return err;
1749 }
1750
1751 /*
1752  * Verify that we have a lease on the given mask.  If not,
1753  * do a getattr against an mds.
1754  */
1755 int ceph_do_getattr(struct inode *inode, int mask)
1756 {
1757         struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
1758         struct ceph_mds_client *mdsc = fsc->mdsc;
1759         struct ceph_mds_request *req;
1760         int err;
1761
1762         if (ceph_snap(inode) == CEPH_SNAPDIR) {
1763                 dout("do_getattr inode %p SNAPDIR\n", inode);
1764                 return 0;
1765         }
1766
1767         dout("do_getattr inode %p mask %s mode 0%o\n", inode, ceph_cap_string(mask), inode->i_mode);
1768         if (ceph_caps_issued_mask(ceph_inode(inode), mask, 1))
1769                 return 0;
1770
1771         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
1772         if (IS_ERR(req))
1773                 return PTR_ERR(req);
1774         req->r_inode = igrab(inode);
1775         req->r_num_caps = 1;
1776         req->r_args.getattr.mask = cpu_to_le32(mask);
1777         err = ceph_mdsc_do_request(mdsc, NULL, req);
1778         ceph_mdsc_put_request(req);
1779         dout("do_getattr result=%d\n", err);
1780         return err;
1781 }
1782
1783
1784 /*
1785  * Check inode permissions.  We verify we have a valid value for
1786  * the AUTH cap, then call the generic handler.
1787  */
1788 int ceph_permission(struct inode *inode, int mask, unsigned int flags)
1789 {
1790         int err;
1791
1792         if (flags & IPERM_FLAG_RCU)
1793                 return -ECHILD;
1794
1795         err = ceph_do_getattr(inode, CEPH_CAP_AUTH_SHARED);
1796
1797         if (!err)
1798                 err = generic_permission(inode, mask, flags, NULL);
1799         return err;
1800 }
1801
1802 /*
1803  * Get all attributes.  Hopefully somedata we'll have a statlite()
1804  * and can limit the fields we require to be accurate.
1805  */
1806 int ceph_getattr(struct vfsmount *mnt, struct dentry *dentry,
1807                  struct kstat *stat)
1808 {
1809         struct inode *inode = dentry->d_inode;
1810         struct ceph_inode_info *ci = ceph_inode(inode);
1811         int err;
1812
1813         err = ceph_do_getattr(inode, CEPH_STAT_CAP_INODE_ALL);
1814         if (!err) {
1815                 generic_fillattr(inode, stat);
1816                 stat->ino = inode->i_ino;
1817                 if (ceph_snap(inode) != CEPH_NOSNAP)
1818                         stat->dev = ceph_snap(inode);
1819                 else
1820                         stat->dev = 0;
1821                 if (S_ISDIR(inode->i_mode)) {
1822                         stat->size = ci->i_rbytes;
1823                         stat->blocks = 0;
1824                         stat->blksize = 65536;
1825                 }
1826         }
1827         return err;
1828 }