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
  13 #include "super.h"
  14 #include "mds_client.h"
  15 #include <linux/ceph/decode.h>
  16
  17 /*
  18  * Ceph inode operations
  19  *
  20  * Implement basic inode helpers (get, alloc) and inode ops (getattr,
  21  * setattr, etc.), xattr helpers, and helpers for assimilating
  22  * metadata returned by the MDS into our cache.
  23  *
  24  * Also define helpers for doing asynchronous writeback, invalidation,
  25  * and truncation for the benefit of those who can't afford to block
  26  * (typically because they are in the message handler path).
  27  */
  28
  29 static const struct inode_operations ceph_symlink_iops;
  30
  31 static void ceph_invalidate_work(struct work_struct *work);
  32 static void ceph_writeback_work(struct work_struct *work);
  33 static void ceph_vmtruncate_work(struct work_struct *work);
  34
  35 /*
  36  * find or create an inode, given the ceph ino number
  37  */
  38 static int ceph_set_ino_cb(struct inode *inode, void *data)
  39 {
  40         ceph_inode(inode)->i_vino = *(struct ceph_vino *)data;
  41         inode->i_ino = ceph_vino_to_ino(*(struct ceph_vino *)data);
  42         return 0;
  43 }
  44
  45 struct inode *ceph_get_inode(struct super_block *sb, struct ceph_vino vino)
  46 {
  47         struct inode *inode;
  48         ino_t t = ceph_vino_to_ino(vino);
  49
  50         inode = iget5_locked(sb, t, ceph_ino_compare, ceph_set_ino_cb, &vino);
  51         if (inode == NULL)
  52                 return ERR_PTR(-ENOMEM);
  53         if (inode->i_state & I_NEW) {
  54                 dout("get_inode created new inode %p %llx.%llx ino %llx\n",
  55                      inode, ceph_vinop(inode), (u64)inode->i_ino);
  56                 unlock_new_inode(inode);
  57         }
  58
  59         dout("get_inode on %lu=%llx.%llx got %p\n", inode->i_ino, vino.ino,
  60              vino.snap, inode);
  61         return inode;
  62 }
  63
  64 struct inode *ceph_lookup_inode(struct super_block *sb, struct ceph_vino vino)
  65 {
  66         struct inode *inode;
  67         ino_t t = ceph_vino_to_ino(vino);
  68         inode = ilookup5_nowait(sb, t, ceph_ino_compare, &vino);
  69         return inode;
  70 }
  71
  72 /*
  73  * get/constuct snapdir inode for a given directory
  74  */
  75 struct inode *ceph_get_snapdir(struct inode *parent)
  76 {
  77         struct ceph_vino vino = {
  78                 .ino = ceph_ino(parent),
  79                 .snap = CEPH_SNAPDIR,
  80         };
  81         struct inode *inode = ceph_get_inode(parent->i_sb, vino);
  82         struct ceph_inode_info *ci = ceph_inode(inode);
  83
  84         BUG_ON(!S_ISDIR(parent->i_mode));
  85         if (IS_ERR(inode))
  86                 return inode;
  87         inode->i_mode = parent->i_mode;
  88         inode->i_uid = parent->i_uid;
  89         inode->i_gid = parent->i_gid;
  90         inode->i_op = &ceph_dir_iops;
  91         inode->i_fop = &ceph_dir_fops;
  92         ci->i_snap_caps = CEPH_CAP_PIN; /* so we can open */
  93         ci->i_rbytes = 0;
  94         return inode;
  95 }
  96
  97 const struct inode_operations ceph_file_iops = {
  98         .permission = ceph_permission,
  99         .setattr = ceph_setattr,
 100         .getattr = ceph_getattr,
 101         .setxattr = ceph_setxattr,
 102         .getxattr = ceph_getxattr,
 103         .listxattr = ceph_listxattr,
 104         .removexattr = ceph_removexattr,
 105 };
 106
 107
 108 /*
 109  * We use a 'frag tree' to keep track of the MDS's directory fragments
 110  * for a given inode (usually there is just a single fragment).  We
 111  * need to know when a child frag is delegated to a new MDS, or when
 112  * it is flagged as replicated, so we can direct our requests
 113  * accordingly.
 114  */
 115
 116 /*
 117  * find/create a frag in the tree
 118  */
 119 static struct ceph_inode_frag *__get_or_create_frag(struct ceph_inode_info *ci,
 120                                                     u32 f)
 121 {
 122         struct rb_node **p;
 123         struct rb_node *parent = NULL;
 124         struct ceph_inode_frag *frag;
 125         int c;
 126
 127         p = &ci->i_fragtree.rb_node;
 128         while (*p) {
 129                 parent = *p;
 130                 frag = rb_entry(parent, struct ceph_inode_frag, node);
 131                 c = ceph_frag_compare(f, frag->frag);
 132                 if (c < 0)
 133                         p = &(*p)->rb_left;
 134                 else if (c > 0)
 135                         p = &(*p)->rb_right;
 136                 else
 137                         return frag;
 138         }
 139
 140         frag = kmalloc(sizeof(*frag), GFP_NOFS);
 141         if (!frag) {
 142                 pr_err("__get_or_create_frag ENOMEM on %p %llx.%llx "
 143                        "frag %x\n", &ci->vfs_inode,
 144                        ceph_vinop(&ci->vfs_inode), f);
 145                 return ERR_PTR(-ENOMEM);
 146         }
 147         frag->frag = f;
 148         frag->split_by = 0;
 149         frag->mds = -1;
 150         frag->ndist = 0;
 151
 152         rb_link_node(&frag->node, parent, p);
 153         rb_insert_color(&frag->node, &ci->i_fragtree);
 154
 155         dout("get_or_create_frag added %llx.%llx frag %x\n",
 156              ceph_vinop(&ci->vfs_inode), f);
 157         return frag;
 158 }
 159
 160 /*
 161  * find a specific frag @f
 162  */
 163 struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci, u32 f)
 164 {
 165         struct rb_node *n = ci->i_fragtree.rb_node;
 166
 167         while (n) {
 168                 struct ceph_inode_frag *frag =
 169                         rb_entry(n, struct ceph_inode_frag, node);
 170                 int c = ceph_frag_compare(f, frag->frag);
 171                 if (c < 0)
 172                         n = n->rb_left;
 173                 else if (c > 0)
 174                         n = n->rb_right;
 175                 else
 176                         return frag;
 177         }
 178         return NULL;
 179 }
 180
 181 /*
 182  * Choose frag containing the given value @v.  If @pfrag is
 183  * specified, copy the frag delegation info to the caller if
 184  * it is present.
 185  */
 186 u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
 187                      struct ceph_inode_frag *pfrag,
 188                      int *found)
 189 {
 190         u32 t = ceph_frag_make(0, 0);
 191         struct ceph_inode_frag *frag;
 192         unsigned nway, i;
 193         u32 n;
 194
 195         if (found)
 196                 *found = 0;
 197
 198         mutex_lock(&ci->i_fragtree_mutex);
 199         while (1) {
 200                 WARN_ON(!ceph_frag_contains_value(t, v));
 201                 frag = __ceph_find_frag(ci, t);
 202                 if (!frag)
 203                         break; /* t is a leaf */
 204                 if (frag->split_by == 0) {
 205                         if (pfrag)
 206                                 memcpy(pfrag, frag, sizeof(*pfrag));
 207                         if (found)
 208                                 *found = 1;
 209                         break;
 210                 }
 211
 212                 /* choose child */
 213                 nway = 1 << frag->split_by;
 214                 dout("choose_frag(%x) %x splits by %d (%d ways)\n", v, t,
 215                      frag->split_by, nway);
 216                 for (i = 0; i < nway; i++) {
 217                         n = ceph_frag_make_child(t, frag->split_by, i);
 218                         if (ceph_frag_contains_value(n, v)) {
 219                                 t = n;
 220                                 break;
 221                         }
 222                 }
 223                 BUG_ON(i == nway);
 224         }
 225         dout("choose_frag(%x) = %x\n", v, t);
 226
 227         mutex_unlock(&ci->i_fragtree_mutex);
 228         return t;
 229 }
 230
 231 /*
 232  * Process dirfrag (delegation) info from the mds.  Include leaf
 233  * fragment in tree ONLY if ndist > 0.  Otherwise, only
 234  * branches/splits are included in i_fragtree)
 235  */
 236 static int ceph_fill_dirfrag(struct inode *inode,
 237                              struct ceph_mds_reply_dirfrag *dirinfo)
 238 {
 239         struct ceph_inode_info *ci = ceph_inode(inode);
 240         struct ceph_inode_frag *frag;
 241         u32 id = le32_to_cpu(dirinfo->frag);
 242         int mds = le32_to_cpu(dirinfo->auth);
 243         int ndist = le32_to_cpu(dirinfo->ndist);
 244         int i;
 245         int err = 0;
 246
 247         mutex_lock(&ci->i_fragtree_mutex);
 248         if (ndist == 0) {
 249                 /* no delegation info needed. */
 250                 frag = __ceph_find_frag(ci, id);
 251                 if (!frag)
 252                         goto out;
 253                 if (frag->split_by == 0) {
 254                         /* tree leaf, remove */
 255                         dout("fill_dirfrag removed %llx.%llx frag %x"
 256                              " (no ref)\n", ceph_vinop(inode), id);
 257                         rb_erase(&frag->node, &ci->i_fragtree);
 258                         kfree(frag);
 259                 } else {
 260                         /* tree branch, keep and clear */
 261                         dout("fill_dirfrag cleared %llx.%llx frag %x"
 262                              " referral\n", ceph_vinop(inode), id);
 263                         frag->mds = -1;
 264                         frag->ndist = 0;
 265                 }
 266                 goto out;
 267         }
 268
 269
 270         /* find/add this frag to store mds delegation info */
 271         frag = __get_or_create_frag(ci, id);
 272         if (IS_ERR(frag)) {
 273                 /* this is not the end of the world; we can continue
 274                    with bad/inaccurate delegation info */
 275                 pr_err("fill_dirfrag ENOMEM on mds ref %llx.%llx fg %x\n",
 276                        ceph_vinop(inode), le32_to_cpu(dirinfo->frag));
 277                 err = -ENOMEM;
 278                 goto out;
 279         }
 280
 281         frag->mds = mds;
 282         frag->ndist = min_t(u32, ndist, CEPH_MAX_DIRFRAG_REP);
 283         for (i = 0; i < frag->ndist; i++)
 284                 frag->dist[i] = le32_to_cpu(dirinfo->dist[i]);
 285         dout("fill_dirfrag %llx.%llx frag %x ndist=%d\n",
 286              ceph_vinop(inode), frag->frag, frag->ndist);
 287
 288 out:
 289         mutex_unlock(&ci->i_fragtree_mutex);
 290         return err;
 291 }
 292
 293
 294 /*
 295  * initialize a newly allocated inode.
 296  */
 297 struct inode *ceph_alloc_inode(struct super_block *sb)
 298 {
 299         struct ceph_inode_info *ci;
 300         int i;
 301
 302         ci = kmem_cache_alloc(ceph_inode_cachep, GFP_NOFS);
 303         if (!ci)
 304                 return NULL;
 305
 306         dout("alloc_inode %p\n", &ci->vfs_inode);
 307
 308         spin_lock_init(&ci->i_ceph_lock);
 309
 310         ci->i_version = 0;
 311         ci->i_time_warp_seq = 0;
 312         ci->i_ceph_flags = 0;
 313         atomic_set(&ci->i_release_count, 1);
 314         atomic_set(&ci->i_complete_count, 0);
 315         ci->i_symlink = NULL;
 316
 317         memset(&ci->i_dir_layout, 0, sizeof(ci->i_dir_layout));
 318
 319         ci->i_fragtree = RB_ROOT;
 320         mutex_init(&ci->i_fragtree_mutex);
 321
 322         ci->i_xattrs.blob = NULL;
 323         ci->i_xattrs.prealloc_blob = NULL;
 324         ci->i_xattrs.dirty = false;
 325         ci->i_xattrs.index = RB_ROOT;
 326         ci->i_xattrs.count = 0;
 327         ci->i_xattrs.names_size = 0;
 328         ci->i_xattrs.vals_size = 0;
 329         ci->i_xattrs.version = 0;
 330         ci->i_xattrs.index_version = 0;
 331
 332         ci->i_caps = RB_ROOT;
 333         ci->i_auth_cap = NULL;
 334         ci->i_dirty_caps = 0;
 335         ci->i_flushing_caps = 0;
 336         INIT_LIST_HEAD(&ci->i_dirty_item);
 337         INIT_LIST_HEAD(&ci->i_flushing_item);
 338         ci->i_cap_flush_seq = 0;
 339         ci->i_cap_flush_last_tid = 0;
 340         memset(&ci->i_cap_flush_tid, 0, sizeof(ci->i_cap_flush_tid));
 341         init_waitqueue_head(&ci->i_cap_wq);
 342         ci->i_hold_caps_min = 0;
 343         ci->i_hold_caps_max = 0;
 344         INIT_LIST_HEAD(&ci->i_cap_delay_list);
 345         ci->i_cap_exporting_mds = 0;
 346         ci->i_cap_exporting_mseq = 0;
 347         ci->i_cap_exporting_issued = 0;
 348         INIT_LIST_HEAD(&ci->i_cap_snaps);
 349         ci->i_head_snapc = NULL;
 350         ci->i_snap_caps = 0;
 351
 352         for (i = 0; i < CEPH_FILE_MODE_NUM; i++)
 353                 ci->i_nr_by_mode[i] = 0;
 354
 355         ci->i_truncate_seq = 0;
 356         ci->i_truncate_size = 0;
 357         ci->i_truncate_pending = 0;
 358
 359         ci->i_max_size = 0;
 360         ci->i_reported_size = 0;
 361         ci->i_wanted_max_size = 0;
 362         ci->i_requested_max_size = 0;
 363
 364         ci->i_pin_ref = 0;
 365         ci->i_rd_ref = 0;
 366         ci->i_rdcache_ref = 0;
 367         ci->i_wr_ref = 0;
 368         ci->i_wb_ref = 0;
 369         ci->i_wrbuffer_ref = 0;
 370         ci->i_wrbuffer_ref_head = 0;
 371         ci->i_shared_gen = 0;
 372         ci->i_rdcache_gen = 0;
 373         ci->i_rdcache_revoking = 0;
 374
 375         INIT_LIST_HEAD(&ci->i_unsafe_writes);
 376         INIT_LIST_HEAD(&ci->i_unsafe_dirops);
 377         spin_lock_init(&ci->i_unsafe_lock);
 378
 379         ci->i_snap_realm = NULL;
 380         INIT_LIST_HEAD(&ci->i_snap_realm_item);
 381         INIT_LIST_HEAD(&ci->i_snap_flush_item);
 382
 383         INIT_WORK(&ci->i_wb_work, ceph_writeback_work);
 384         INIT_WORK(&ci->i_pg_inv_work, ceph_invalidate_work);
 385
 386         INIT_WORK(&ci->i_vmtruncate_work, ceph_vmtruncate_work);
 387
 388         return &ci->vfs_inode;
 389 }
 390
 391 static void ceph_i_callback(struct rcu_head *head)
 392 {
 393         struct inode *inode = container_of(head, struct inode, i_rcu);
 394         struct ceph_inode_info *ci = ceph_inode(inode);
 395
 396         kmem_cache_free(ceph_inode_cachep, ci);
 397 }
 398
 399 void ceph_destroy_inode(struct inode *inode)
 400 {
 401         struct ceph_inode_info *ci = ceph_inode(inode);
 402         struct ceph_inode_frag *frag;
 403         struct rb_node *n;
 404
 405         dout("destroy_inode %p ino %llx.%llx\n", inode, ceph_vinop(inode));
 406
 407         ceph_queue_caps_release(inode);
 408
 409         /*
 410          * we may still have a snap_realm reference if there are stray
 411          * caps in i_cap_exporting_issued or i_snap_caps.
 412          */
 413         if (ci->i_snap_realm) {
 414                 struct ceph_mds_client *mdsc =
 415                         ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc;
 416                 struct ceph_snap_realm *realm = ci->i_snap_realm;
 417
 418                 dout(" dropping residual ref to snap realm %p\n", realm);
 419                 spin_lock(&realm->inodes_with_caps_lock);
 420                 list_del_init(&ci->i_snap_realm_item);
 421                 spin_unlock(&realm->inodes_with_caps_lock);
 422                 ceph_put_snap_realm(mdsc, realm);
 423         }
 424
 425         kfree(ci->i_symlink);
 426         while ((n = rb_first(&ci->i_fragtree)) != NULL) {
 427                 frag = rb_entry(n, struct ceph_inode_frag, node);
 428                 rb_erase(n, &ci->i_fragtree);
 429                 kfree(frag);
 430         }
 431
 432         __ceph_destroy_xattrs(ci);
 433         if (ci->i_xattrs.blob)
 434                 ceph_buffer_put(ci->i_xattrs.blob);
 435         if (ci->i_xattrs.prealloc_blob)
 436                 ceph_buffer_put(ci->i_xattrs.prealloc_blob);
 437
 438         call_rcu(&inode->i_rcu, ceph_i_callback);
 439 }
 440
 441
 442 /*
 443  * Helpers to fill in size, ctime, mtime, and atime.  We have to be
 444  * careful because either the client or MDS may have more up to date
 445  * info, depending on which capabilities are held, and whether
 446  * time_warp_seq or truncate_seq have increased.  (Ordinarily, mtime
 447  * and size are monotonically increasing, except when utimes() or
 448  * truncate() increments the corresponding _seq values.)
 449  */
 450 int ceph_fill_file_size(struct inode *inode, int issued,
 451                         u32 truncate_seq, u64 truncate_size, u64 size)
 452 {
 453         struct ceph_inode_info *ci = ceph_inode(inode);
 454         int queue_trunc = 0;
 455
 456         if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) > 0 ||
 457             (truncate_seq == ci->i_truncate_seq && size > inode->i_size)) {
 458                 dout("size %lld -> %llu\n", inode->i_size, size);
 459                 inode->i_size = size;
 460                 inode->i_blocks = (size + (1<<9) - 1) >> 9;
 461                 ci->i_reported_size = size;
 462                 if (truncate_seq != ci->i_truncate_seq) {
 463                         dout("truncate_seq %u -> %u\n",
 464                              ci->i_truncate_seq, truncate_seq);
 465                         ci->i_truncate_seq = truncate_seq;
 466                         /*
 467                          * If we hold relevant caps, or in the case where we're
 468                          * not the only client referencing this file and we
 469                          * don't hold those caps, then we need to check whether
 470                          * the file is either opened or mmaped
 471                          */
 472                         if ((issued & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_RD|
 473                                        CEPH_CAP_FILE_WR|CEPH_CAP_FILE_BUFFER|
 474                                        CEPH_CAP_FILE_EXCL|
 475                                        CEPH_CAP_FILE_LAZYIO)) ||
 476                             mapping_mapped(inode->i_mapping) ||
 477                             __ceph_caps_file_wanted(ci)) {
 478                                 ci->i_truncate_pending++;
 479                                 queue_trunc = 1;
 480                         }
 481                 }
 482         }
 483         if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) >= 0 &&
 484             ci->i_truncate_size != truncate_size) {
 485                 dout("truncate_size %lld -> %llu\n", ci->i_truncate_size,
 486                      truncate_size);
 487                 ci->i_truncate_size = truncate_size;
 488         }
 489         return queue_trunc;
 490 }
 491
 492 void ceph_fill_file_time(struct inode *inode, int issued,
 493                          u64 time_warp_seq, struct timespec *ctime,
 494                          struct timespec *mtime, struct timespec *atime)
 495 {
 496         struct ceph_inode_info *ci = ceph_inode(inode);
 497         int warn = 0;
 498
 499         if (issued & (CEPH_CAP_FILE_EXCL|
 500                       CEPH_CAP_FILE_WR|
 501                       CEPH_CAP_FILE_BUFFER|
 502                       CEPH_CAP_AUTH_EXCL|
 503                       CEPH_CAP_XATTR_EXCL)) {
 504                 if (timespec_compare(ctime, &inode->i_ctime) > 0) {
 505                         dout("ctime %ld.%09ld -> %ld.%09ld inc w/ cap\n",
 506                              inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
 507                              ctime->tv_sec, ctime->tv_nsec);
 508                         inode->i_ctime = *ctime;
 509                 }
 510                 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) > 0) {
 511                         /* the MDS did a utimes() */
 512                         dout("mtime %ld.%09ld -> %ld.%09ld "
 513                              "tw %d -> %d\n",
 514                              inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
 515                              mtime->tv_sec, mtime->tv_nsec,
 516                              ci->i_time_warp_seq, (int)time_warp_seq);
 517
 518                         inode->i_mtime = *mtime;
 519                         inode->i_atime = *atime;
 520                         ci->i_time_warp_seq = time_warp_seq;
 521                 } else if (time_warp_seq == ci->i_time_warp_seq) {
 522                         /* nobody did utimes(); take the max */
 523                         if (timespec_compare(mtime, &inode->i_mtime) > 0) {
 524                                 dout("mtime %ld.%09ld -> %ld.%09ld inc\n",
 525                                      inode->i_mtime.tv_sec,
 526                                      inode->i_mtime.tv_nsec,
 527                                      mtime->tv_sec, mtime->tv_nsec);
 528                                 inode->i_mtime = *mtime;
 529                         }
 530                         if (timespec_compare(atime, &inode->i_atime) > 0) {
 531                                 dout("atime %ld.%09ld -> %ld.%09ld inc\n",
 532                                      inode->i_atime.tv_sec,
 533                                      inode->i_atime.tv_nsec,
 534                                      atime->tv_sec, atime->tv_nsec);
 535                                 inode->i_atime = *atime;
 536                         }
 537                 } else if (issued & CEPH_CAP_FILE_EXCL) {
 538                         /* we did a utimes(); ignore mds values */
 539                 } else {
 540                         warn = 1;
 541                 }
 542         } else {
 543                 /* we have no write|excl caps; whatever the MDS says is true */
 544                 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) >= 0) {
 545                         inode->i_ctime = *ctime;
 546                         inode->i_mtime = *mtime;
 547                         inode->i_atime = *atime;
 548                         ci->i_time_warp_seq = time_warp_seq;
 549                 } else {
 550                         warn = 1;
 551                 }
 552         }
 553         if (warn) /* time_warp_seq shouldn't go backwards */
 554                 dout("%p mds time_warp_seq %llu < %u\n",
 555                      inode, time_warp_seq, ci->i_time_warp_seq);
 556 }
 557
 558 /*
 559  * Populate an inode based on info from mds.  May be called on new or
 560  * existing inodes.
 561  */
 562 static int fill_inode(struct inode *inode,
 563                       struct ceph_mds_reply_info_in *iinfo,
 564                       struct ceph_mds_reply_dirfrag *dirinfo,
 565                       struct ceph_mds_session *session,
 566                       unsigned long ttl_from, int cap_fmode,
 567                       struct ceph_cap_reservation *caps_reservation)
 568 {
 569         struct ceph_mds_reply_inode *info = iinfo->in;
 570         struct ceph_inode_info *ci = ceph_inode(inode);
 571         int i;
 572         int issued = 0, implemented;
 573         struct timespec mtime, atime, ctime;
 574         u32 nsplits;
 575         struct ceph_buffer *xattr_blob = NULL;
 576         int err = 0;
 577         int queue_trunc = 0;
 578
 579         dout("fill_inode %p ino %llx.%llx v %llu had %llu\n",
 580              inode, ceph_vinop(inode), le64_to_cpu(info->version),
 581              ci->i_version);
 582
 583         /*
 584          * prealloc xattr data, if it looks like we'll need it.  only
 585          * if len > 4 (meaning there are actually xattrs; the first 4
 586          * bytes are the xattr count).
 587          */
 588         if (iinfo->xattr_len > 4) {
 589                 xattr_blob = ceph_buffer_new(iinfo->xattr_len, GFP_NOFS);
 590                 if (!xattr_blob)
 591                         pr_err("fill_inode ENOMEM xattr blob %d bytes\n",
 592                                iinfo->xattr_len);
 593         }
 594
 595         spin_lock(&ci->i_ceph_lock);
 596
 597         /*
 598          * provided version will be odd if inode value is projected,
 599          * even if stable.  skip the update if we have newer stable
 600          * info (ours>=theirs, e.g. due to racing mds replies), unless
 601          * we are getting projected (unstable) info (in which case the
 602          * version is odd, and we want ours>theirs).
 603          *   us   them
 604          *   2    2     skip
 605          *   3    2     skip
 606          *   3    3     update
 607          */
 608         if (le64_to_cpu(info->version) > 0 &&
 609             (ci->i_version & ~1) >= le64_to_cpu(info->version))
 610                 goto no_change;
 611
 612         issued = __ceph_caps_issued(ci, &implemented);
 613         issued |= implemented | __ceph_caps_dirty(ci);
 614
 615         /* update inode */
 616         ci->i_version = le64_to_cpu(info->version);
 617         inode->i_version++;
 618         inode->i_rdev = le32_to_cpu(info->rdev);
 619
 620         if ((issued & CEPH_CAP_AUTH_EXCL) == 0) {
 621                 inode->i_mode = le32_to_cpu(info->mode);
 622                 inode->i_uid = make_kuid(&init_user_ns, le32_to_cpu(info->uid));
 623                 inode->i_gid = make_kgid(&init_user_ns, le32_to_cpu(info->gid));
 624                 dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode,
 625                      from_kuid(&init_user_ns, inode->i_uid),
 626                      from_kgid(&init_user_ns, inode->i_gid));
 627         }
 628
 629         if ((issued & CEPH_CAP_LINK_EXCL) == 0)
 630                 set_nlink(inode, le32_to_cpu(info->nlink));
 631
 632         /* be careful with mtime, atime, size */
 633         ceph_decode_timespec(&atime, &info->atime);
 634         ceph_decode_timespec(&mtime, &info->mtime);
 635         ceph_decode_timespec(&ctime, &info->ctime);
 636         queue_trunc = ceph_fill_file_size(inode, issued,
 637                                           le32_to_cpu(info->truncate_seq),
 638                                           le64_to_cpu(info->truncate_size),
 639                                           le64_to_cpu(info->size));
 640         ceph_fill_file_time(inode, issued,
 641                             le32_to_cpu(info->time_warp_seq),
 642                             &ctime, &mtime, &atime);
 643
 644         /* only update max_size on auth cap */
 645         if ((info->cap.flags & CEPH_CAP_FLAG_AUTH) &&
 646             ci->i_max_size != le64_to_cpu(info->max_size)) {
 647                 dout("max_size %lld -> %llu\n", ci->i_max_size,
 648                      le64_to_cpu(info->max_size));
 649                 ci->i_max_size = le64_to_cpu(info->max_size);
 650         }
 651
 652         ci->i_layout = info->layout;
 653         inode->i_blkbits = fls(le32_to_cpu(info->layout.fl_stripe_unit)) - 1;
 654
 655         /* xattrs */
 656         /* note that if i_xattrs.len <= 4, i_xattrs.data will still be NULL. */
 657         if ((issued & CEPH_CAP_XATTR_EXCL) == 0 &&
 658             le64_to_cpu(info->xattr_version) > ci->i_xattrs.version) {
 659                 if (ci->i_xattrs.blob)
 660                         ceph_buffer_put(ci->i_xattrs.blob);
 661                 ci->i_xattrs.blob = xattr_blob;
 662                 if (xattr_blob)
 663                         memcpy(ci->i_xattrs.blob->vec.iov_base,
 664                                iinfo->xattr_data, iinfo->xattr_len);
 665                 ci->i_xattrs.version = le64_to_cpu(info->xattr_version);
 666                 xattr_blob = NULL;
 667         }
 668
 669         inode->i_mapping->a_ops = &ceph_aops;
 670         inode->i_mapping->backing_dev_info =
 671                 &ceph_sb_to_client(inode->i_sb)->backing_dev_info;
 672
 673         switch (inode->i_mode & S_IFMT) {
 674         case S_IFIFO:
 675         case S_IFBLK:
 676         case S_IFCHR:
 677         case S_IFSOCK:
 678                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
 679                 inode->i_op = &ceph_file_iops;
 680                 break;
 681         case S_IFREG:
 682                 inode->i_op = &ceph_file_iops;
 683                 inode->i_fop = &ceph_file_fops;
 684                 break;
 685         case S_IFLNK:
 686                 inode->i_op = &ceph_symlink_iops;
 687                 if (!ci->i_symlink) {
 688                         u32 symlen = iinfo->symlink_len;
 689                         char *sym;
 690
 691                         spin_unlock(&ci->i_ceph_lock);
 692
 693                         err = -EINVAL;
 694                         if (WARN_ON(symlen != inode->i_size))
 695                                 goto out;
 696
 697                         err = -ENOMEM;
 698                         sym = kstrndup(iinfo->symlink, symlen, GFP_NOFS);
 699                         if (!sym)
 700                                 goto out;
 701
 702                         spin_lock(&ci->i_ceph_lock);
 703                         if (!ci->i_symlink)
 704                                 ci->i_symlink = sym;
 705                         else
 706                                 kfree(sym); /* lost a race */
 707                 }
 708                 break;
 709         case S_IFDIR:
 710                 inode->i_op = &ceph_dir_iops;
 711                 inode->i_fop = &ceph_dir_fops;
 712
 713                 ci->i_dir_layout = iinfo->dir_layout;
 714
 715                 ci->i_files = le64_to_cpu(info->files);
 716                 ci->i_subdirs = le64_to_cpu(info->subdirs);
 717                 ci->i_rbytes = le64_to_cpu(info->rbytes);
 718                 ci->i_rfiles = le64_to_cpu(info->rfiles);
 719                 ci->i_rsubdirs = le64_to_cpu(info->rsubdirs);
 720                 ceph_decode_timespec(&ci->i_rctime, &info->rctime);
 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         /* set dir completion flag? */
 728         if (S_ISDIR(inode->i_mode) &&
 729             ci->i_files == 0 && ci->i_subdirs == 0 &&
 730             ceph_snap(inode) == CEPH_NOSNAP &&
 731             (le32_to_cpu(info->cap.caps) & CEPH_CAP_FILE_SHARED) &&
 732             (issued & CEPH_CAP_FILE_EXCL) == 0 &&
 733             !__ceph_dir_is_complete(ci)) {
 734                 dout(" marking %p complete (empty)\n", inode);
 735                 __ceph_dir_set_complete(ci, atomic_read(&ci->i_release_count));
 736                 ci->i_max_offset = 2;
 737         }
 738 no_change:
 739         spin_unlock(&ci->i_ceph_lock);
 740
 741         /* queue truncate if we saw i_size decrease */
 742         if (queue_trunc)
 743                 ceph_queue_vmtruncate(inode);
 744
 745         /* populate frag tree */
 746         /* FIXME: move me up, if/when version reflects fragtree changes */
 747         nsplits = le32_to_cpu(info->fragtree.nsplits);
 748         mutex_lock(&ci->i_fragtree_mutex);
 749         for (i = 0; i < nsplits; i++) {
 750                 u32 id = le32_to_cpu(info->fragtree.splits[i].frag);
 751                 struct ceph_inode_frag *frag = __get_or_create_frag(ci, id);
 752
 753                 if (IS_ERR(frag))
 754                         continue;
 755                 frag->split_by = le32_to_cpu(info->fragtree.splits[i].by);
 756                 dout(" frag %x split by %d\n", frag->frag, frag->split_by);
 757         }
 758         mutex_unlock(&ci->i_fragtree_mutex);
 759
 760         /* were we issued a capability? */
 761         if (info->cap.caps) {
 762                 if (ceph_snap(inode) == CEPH_NOSNAP) {
 763                         ceph_add_cap(inode, session,
 764                                      le64_to_cpu(info->cap.cap_id),
 765                                      cap_fmode,
 766                                      le32_to_cpu(info->cap.caps),
 767                                      le32_to_cpu(info->cap.wanted),
 768                                      le32_to_cpu(info->cap.seq),
 769                                      le32_to_cpu(info->cap.mseq),
 770                                      le64_to_cpu(info->cap.realm),
 771                                      info->cap.flags,
 772                                      caps_reservation);
 773                 } else {
 774                         spin_lock(&ci->i_ceph_lock);
 775                         dout(" %p got snap_caps %s\n", inode,
 776                              ceph_cap_string(le32_to_cpu(info->cap.caps)));
 777                         ci->i_snap_caps |= le32_to_cpu(info->cap.caps);
 778                         if (cap_fmode >= 0)
 779                                 __ceph_get_fmode(ci, cap_fmode);
 780                         spin_unlock(&ci->i_ceph_lock);
 781                 }
 782         } else if (cap_fmode >= 0) {
 783                 pr_warning("mds issued no caps on %llx.%llx\n",
 784                            ceph_vinop(inode));
 785                 __ceph_get_fmode(ci, cap_fmode);
 786         }
 787
 788         /* update delegation info? */
 789         if (dirinfo)
 790                 ceph_fill_dirfrag(inode, dirinfo);
 791
 792         err = 0;
 793
 794 out:
 795         if (xattr_blob)
 796                 ceph_buffer_put(xattr_blob);
 797         return err;
 798 }
 799
 800 /*
 801  * caller should hold session s_mutex.
 802  */
 803 static void update_dentry_lease(struct dentry *dentry,
 804                                 struct ceph_mds_reply_lease *lease,
 805                                 struct ceph_mds_session *session,
 806                                 unsigned long from_time)
 807 {
 808         struct ceph_dentry_info *di = ceph_dentry(dentry);
 809         long unsigned duration = le32_to_cpu(lease->duration_ms);
 810         long unsigned ttl = from_time + (duration * HZ) / 1000;
 811         long unsigned half_ttl = from_time + (duration * HZ / 2) / 1000;
 812         struct inode *dir;
 813
 814         /* only track leases on regular dentries */
 815         if (dentry->d_op != &ceph_dentry_ops)
 816                 return;
 817
 818         spin_lock(&dentry->d_lock);
 819         dout("update_dentry_lease %p duration %lu ms ttl %lu\n",
 820              dentry, duration, ttl);
 821
 822         /* make lease_rdcache_gen match directory */
 823         dir = dentry->d_parent->d_inode;
 824         di->lease_shared_gen = ceph_inode(dir)->i_shared_gen;
 825
 826         if (duration == 0)
 827                 goto out_unlock;
 828
 829         if (di->lease_gen == session->s_cap_gen &&
 830             time_before(ttl, dentry->d_time))
 831                 goto out_unlock;  /* we already have a newer lease. */
 832
 833         if (di->lease_session && di->lease_session != session)
 834                 goto out_unlock;
 835
 836         ceph_dentry_lru_touch(dentry);
 837
 838         if (!di->lease_session)
 839                 di->lease_session = ceph_get_mds_session(session);
 840         di->lease_gen = session->s_cap_gen;
 841         di->lease_seq = le32_to_cpu(lease->seq);
 842         di->lease_renew_after = half_ttl;
 843         di->lease_renew_from = 0;
 844         dentry->d_time = ttl;
 845 out_unlock:
 846         spin_unlock(&dentry->d_lock);
 847         return;
 848 }
 849
 850 /*
 851  * Set dentry's directory position based on the current dir's max, and
 852  * order it in d_subdirs, so that dcache_readdir behaves.
 853  *
 854  * Always called under directory's i_mutex.
 855  */
 856 static void ceph_set_dentry_offset(struct dentry *dn)
 857 {
 858         struct dentry *dir = dn->d_parent;
 859         struct inode *inode = dir->d_inode;
 860         struct ceph_inode_info *ci;
 861         struct ceph_dentry_info *di;
 862
 863         BUG_ON(!inode);
 864
 865         ci = ceph_inode(inode);
 866         di = ceph_dentry(dn);
 867
 868         spin_lock(&ci->i_ceph_lock);
 869         if (!__ceph_dir_is_complete(ci)) {
 870                 spin_unlock(&ci->i_ceph_lock);
 871                 return;
 872         }
 873         di->offset = ceph_inode(inode)->i_max_offset++;
 874         spin_unlock(&ci->i_ceph_lock);
 875
 876         spin_lock(&dir->d_lock);
 877         spin_lock_nested(&dn->d_lock, DENTRY_D_LOCK_NESTED);
 878         list_move(&dn->d_u.d_child, &dir->d_subdirs);
 879         dout("set_dentry_offset %p %lld (%p %p)\n", dn, di->offset,
 880              dn->d_u.d_child.prev, dn->d_u.d_child.next);
 881         spin_unlock(&dn->d_lock);
 882         spin_unlock(&dir->d_lock);
 883 }
 884
 885 /*
 886  * splice a dentry to an inode.
 887  * caller must hold directory i_mutex for this to be safe.
 888  *
 889  * we will only rehash the resulting dentry if @prehash is
 890  * true; @prehash will be set to false (for the benefit of
 891  * the caller) if we fail.
 892  */
 893 static struct dentry *splice_dentry(struct dentry *dn, struct inode *in,
 894                                     bool *prehash, bool set_offset)
 895 {
 896         struct dentry *realdn;
 897
 898         BUG_ON(dn->d_inode);
 899
 900         /* dn must be unhashed */
 901         if (!d_unhashed(dn))
 902                 d_drop(dn);
 903         realdn = d_materialise_unique(dn, in);
 904         if (IS_ERR(realdn)) {
 905                 pr_err("splice_dentry error %ld %p inode %p ino %llx.%llx\n",
 906                        PTR_ERR(realdn), dn, in, ceph_vinop(in));
 907                 if (prehash)
 908                         *prehash = false; /* don't rehash on error */
 909                 dn = realdn; /* note realdn contains the error */
 910                 goto out;
 911         } else if (realdn) {
 912                 dout("dn %p (%d) spliced with %p (%d) "
 913                      "inode %p ino %llx.%llx\n",
 914                      dn, d_count(dn),
 915                      realdn, d_count(realdn),
 916                      realdn->d_inode, ceph_vinop(realdn->d_inode));
 917                 dput(dn);
 918                 dn = realdn;
 919         } else {
 920                 BUG_ON(!ceph_dentry(dn));
 921                 dout("dn %p attached to %p ino %llx.%llx\n",
 922                      dn, dn->d_inode, ceph_vinop(dn->d_inode));
 923         }
 924         if ((!prehash || *prehash) && d_unhashed(dn))
 925                 d_rehash(dn);
 926         if (set_offset)
 927                 ceph_set_dentry_offset(dn);
 928 out:
 929         return dn;
 930 }
 931
 932 /*
 933  * Incorporate results into the local cache.  This is either just
 934  * one inode, or a directory, dentry, and possibly linked-to inode (e.g.,
 935  * after a lookup).
 936  *
 937  * A reply may contain
 938  *         a directory inode along with a dentry.
 939  *  and/or a target inode
 940  *
 941  * Called with snap_rwsem (read).
 942  */
 943 int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req,
 944                     struct ceph_mds_session *session)
 945 {
 946         struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
 947         struct inode *in = NULL;
 948         struct ceph_mds_reply_inode *ininfo;
 949         struct ceph_vino vino;
 950         struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
 951         int i = 0;
 952         int err = 0;
 953
 954         dout("fill_trace %p is_dentry %d is_target %d\n", req,
 955              rinfo->head->is_dentry, rinfo->head->is_target);
 956
 957 #if 0
 958         /*
 959          * Debugging hook:
 960          *
 961          * If we resend completed ops to a recovering mds, we get no
 962          * trace.  Since that is very rare, pretend this is the case
 963          * to ensure the 'no trace' handlers in the callers behave.
 964          *
 965          * Fill in inodes unconditionally to avoid breaking cap
 966          * invariants.
 967          */
 968         if (rinfo->head->op & CEPH_MDS_OP_WRITE) {
 969                 pr_info("fill_trace faking empty trace on %lld %s\n",
 970                         req->r_tid, ceph_mds_op_name(rinfo->head->op));
 971                 if (rinfo->head->is_dentry) {
 972                         rinfo->head->is_dentry = 0;
 973                         err = fill_inode(req->r_locked_dir,
 974                                          &rinfo->diri, rinfo->dirfrag,
 975                                          session, req->r_request_started, -1);
 976                 }
 977                 if (rinfo->head->is_target) {
 978                         rinfo->head->is_target = 0;
 979                         ininfo = rinfo->targeti.in;
 980                         vino.ino = le64_to_cpu(ininfo->ino);
 981                         vino.snap = le64_to_cpu(ininfo->snapid);
 982                         in = ceph_get_inode(sb, vino);
 983                         err = fill_inode(in, &rinfo->targeti, NULL,
 984                                          session, req->r_request_started,
 985                                          req->r_fmode);
 986                         iput(in);
 987                 }
 988         }
 989 #endif
 990
 991         if (!rinfo->head->is_target && !rinfo->head->is_dentry) {
 992                 dout("fill_trace reply is empty!\n");
 993                 if (rinfo->head->result == 0 && req->r_locked_dir)
 994                         ceph_invalidate_dir_request(req);
 995                 return 0;
 996         }
 997
 998         if (rinfo->head->is_dentry) {
 999                 struct inode *dir = req->r_locked_dir;
1000
1001                 if (dir) {
1002                         err = fill_inode(dir, &rinfo->diri, rinfo->dirfrag,
1003                                          session, req->r_request_started, -1,
1004                                          &req->r_caps_reservation);
1005                         if (err < 0)
1006                                 return err;
1007                 } else {
1008                         WARN_ON_ONCE(1);
1009                 }
1010         }
1011
1012         /*
1013          * ignore null lease/binding on snapdir ENOENT, or else we
1014          * will have trouble splicing in the virtual snapdir later
1015          */
1016         if (rinfo->head->is_dentry && !req->r_aborted &&
1017             req->r_locked_dir &&
1018             (rinfo->head->is_target || strncmp(req->r_dentry->d_name.name,
1019                                                fsc->mount_options->snapdir_name,
1020                                                req->r_dentry->d_name.len))) {
1021                 /*
1022                  * lookup link rename   : null -> possibly existing inode
1023                  * mknod symlink mkdir  : null -> new inode
1024                  * unlink               : linked -> null
1025                  */
1026                 struct inode *dir = req->r_locked_dir;
1027                 struct dentry *dn = req->r_dentry;
1028                 bool have_dir_cap, have_lease;
1029
1030                 BUG_ON(!dn);
1031                 BUG_ON(!dir);
1032                 BUG_ON(dn->d_parent->d_inode != dir);
1033                 BUG_ON(ceph_ino(dir) !=
1034                        le64_to_cpu(rinfo->diri.in->ino));
1035                 BUG_ON(ceph_snap(dir) !=
1036                        le64_to_cpu(rinfo->diri.in->snapid));
1037
1038                 /* do we have a lease on the whole dir? */
1039                 have_dir_cap =
1040                         (le32_to_cpu(rinfo->diri.in->cap.caps) &
1041                          CEPH_CAP_FILE_SHARED);
1042
1043                 /* do we have a dn lease? */
1044                 have_lease = have_dir_cap ||
1045                         le32_to_cpu(rinfo->dlease->duration_ms);
1046                 if (!have_lease)
1047                         dout("fill_trace  no dentry lease or dir cap\n");
1048
1049                 /* rename? */
1050                 if (req->r_old_dentry && req->r_op == CEPH_MDS_OP_RENAME) {
1051                         dout(" src %p '%.*s' dst %p '%.*s'\n",
1052                              req->r_old_dentry,
1053                              req->r_old_dentry->d_name.len,
1054                              req->r_old_dentry->d_name.name,
1055                              dn, dn->d_name.len, dn->d_name.name);
1056                         dout("fill_trace doing d_move %p -> %p\n",
1057                              req->r_old_dentry, dn);
1058
1059                         d_move(req->r_old_dentry, dn);
1060                         dout(" src %p '%.*s' dst %p '%.*s'\n",
1061                              req->r_old_dentry,
1062                              req->r_old_dentry->d_name.len,
1063                              req->r_old_dentry->d_name.name,
1064                              dn, dn->d_name.len, dn->d_name.name);
1065
1066                         /* ensure target dentry is invalidated, despite
1067                            rehashing bug in vfs_rename_dir */
1068                         ceph_invalidate_dentry_lease(dn);
1069
1070                         /*
1071                          * d_move() puts the renamed dentry at the end of
1072                          * d_subdirs.  We need to assign it an appropriate
1073                          * directory offset so we can behave when dir is
1074                          * complete.
1075                          */
1076                         ceph_set_dentry_offset(req->r_old_dentry);
1077                         dout("dn %p gets new offset %lld\n", req->r_old_dentry,
1078                              ceph_dentry(req->r_old_dentry)->offset);
1079
1080                         dn = req->r_old_dentry;  /* use old_dentry */
1081                         in = dn->d_inode;
1082                 }
1083
1084                 /* null dentry? */
1085                 if (!rinfo->head->is_target) {
1086                         dout("fill_trace null dentry\n");
1087                         if (dn->d_inode) {
1088                                 dout("d_delete %p\n", dn);
1089                                 d_delete(dn);
1090                         } else {
1091                                 dout("d_instantiate %p NULL\n", dn);
1092                                 d_instantiate(dn, NULL);
1093                                 if (have_lease && d_unhashed(dn))
1094                                         d_rehash(dn);
1095                                 update_dentry_lease(dn, rinfo->dlease,
1096                                                     session,
1097                                                     req->r_request_started);
1098                         }
1099                         goto done;
1100                 }
1101
1102                 /* attach proper inode */
1103                 ininfo = rinfo->targeti.in;
1104                 vino.ino = le64_to_cpu(ininfo->ino);
1105                 vino.snap = le64_to_cpu(ininfo->snapid);
1106                 in = dn->d_inode;
1107                 if (!in) {
1108                         in = ceph_get_inode(sb, vino);
1109                         if (IS_ERR(in)) {
1110                                 pr_err("fill_trace bad get_inode "
1111                                        "%llx.%llx\n", vino.ino, vino.snap);
1112                                 err = PTR_ERR(in);
1113                                 d_drop(dn);
1114                                 goto done;
1115                         }
1116                         dn = splice_dentry(dn, in, &have_lease, true);
1117                         if (IS_ERR(dn)) {
1118                                 err = PTR_ERR(dn);
1119                                 goto done;
1120                         }
1121                         req->r_dentry = dn;  /* may have spliced */
1122                         ihold(in);
1123                 } else if (ceph_ino(in) == vino.ino &&
1124                            ceph_snap(in) == vino.snap) {
1125                         ihold(in);
1126                 } else {
1127                         dout(" %p links to %p %llx.%llx, not %llx.%llx\n",
1128                              dn, in, ceph_ino(in), ceph_snap(in),
1129                              vino.ino, vino.snap);
1130                         have_lease = false;
1131                         in = NULL;
1132                 }
1133
1134                 if (have_lease)
1135                         update_dentry_lease(dn, rinfo->dlease, session,
1136                                             req->r_request_started);
1137                 dout(" final dn %p\n", dn);
1138                 i++;
1139         } else if ((req->r_op == CEPH_MDS_OP_LOOKUPSNAP ||
1140                    req->r_op == CEPH_MDS_OP_MKSNAP) && !req->r_aborted) {
1141                 struct dentry *dn = req->r_dentry;
1142
1143                 /* fill out a snapdir LOOKUPSNAP dentry */
1144                 BUG_ON(!dn);
1145                 BUG_ON(!req->r_locked_dir);
1146                 BUG_ON(ceph_snap(req->r_locked_dir) != CEPH_SNAPDIR);
1147                 ininfo = rinfo->targeti.in;
1148                 vino.ino = le64_to_cpu(ininfo->ino);
1149                 vino.snap = le64_to_cpu(ininfo->snapid);
1150                 in = ceph_get_inode(sb, vino);
1151                 if (IS_ERR(in)) {
1152                         pr_err("fill_inode get_inode badness %llx.%llx\n",
1153                                vino.ino, vino.snap);
1154                         err = PTR_ERR(in);
1155                         d_delete(dn);
1156                         goto done;
1157                 }
1158                 dout(" linking snapped dir %p to dn %p\n", in, dn);
1159                 dn = splice_dentry(dn, in, NULL, true);
1160                 if (IS_ERR(dn)) {
1161                         err = PTR_ERR(dn);
1162                         goto done;
1163                 }
1164                 req->r_dentry = dn;  /* may have spliced */
1165                 ihold(in);
1166                 rinfo->head->is_dentry = 1;  /* fool notrace handlers */
1167         }
1168
1169         if (rinfo->head->is_target) {
1170                 vino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1171                 vino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1172
1173                 if (in == NULL || ceph_ino(in) != vino.ino ||
1174                     ceph_snap(in) != vino.snap) {
1175                         in = ceph_get_inode(sb, vino);
1176                         if (IS_ERR(in)) {
1177                                 err = PTR_ERR(in);
1178                                 goto done;
1179                         }
1180                 }
1181                 req->r_target_inode = in;
1182
1183                 err = fill_inode(in,
1184                                  &rinfo->targeti, NULL,
1185                                  session, req->r_request_started,
1186                                  (le32_to_cpu(rinfo->head->result) == 0) ?
1187                                  req->r_fmode : -1,
1188                                  &req->r_caps_reservation);
1189                 if (err < 0) {
1190                         pr_err("fill_inode badness %p %llx.%llx\n",
1191                                in, ceph_vinop(in));
1192                         goto done;
1193                 }
1194         }
1195
1196 done:
1197         dout("fill_trace done err=%d\n", err);
1198         return err;
1199 }
1200
1201 /*
1202  * Prepopulate our cache with readdir results, leases, etc.
1203  */
1204 static int readdir_prepopulate_inodes_only(struct ceph_mds_request *req,
1205                                            struct ceph_mds_session *session)
1206 {
1207         struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1208         int i, err = 0;
1209
1210         for (i = 0; i < rinfo->dir_nr; i++) {
1211                 struct ceph_vino vino;
1212                 struct inode *in;
1213                 int rc;
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                 in = ceph_get_inode(req->r_dentry->d_sb, vino);
1219                 if (IS_ERR(in)) {
1220                         err = PTR_ERR(in);
1221                         dout("new_inode badness got %d\n", err);
1222                         continue;
1223                 }
1224                 rc = fill_inode(in, &rinfo->dir_in[i], NULL, session,
1225                                 req->r_request_started, -1,
1226                                 &req->r_caps_reservation);
1227                 if (rc < 0) {
1228                         pr_err("fill_inode badness on %p got %d\n", in, rc);
1229                         err = rc;
1230                         continue;
1231                 }
1232         }
1233
1234         return err;
1235 }
1236
1237 int ceph_readdir_prepopulate(struct ceph_mds_request *req,
1238                              struct ceph_mds_session *session)
1239 {
1240         struct dentry *parent = req->r_dentry;
1241         struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1242         struct qstr dname;
1243         struct dentry *dn;
1244         struct inode *in;
1245         int err = 0, i;
1246         struct inode *snapdir = NULL;
1247         struct ceph_mds_request_head *rhead = req->r_request->front.iov_base;
1248         u64 frag = le32_to_cpu(rhead->args.readdir.frag);
1249         struct ceph_dentry_info *di;
1250
1251         if (req->r_aborted)
1252                 return readdir_prepopulate_inodes_only(req, session);
1253
1254         if (le32_to_cpu(rinfo->head->op) == CEPH_MDS_OP_LSSNAP) {
1255                 snapdir = ceph_get_snapdir(parent->d_inode);
1256                 parent = d_find_alias(snapdir);
1257                 dout("readdir_prepopulate %d items under SNAPDIR dn %p\n",
1258                      rinfo->dir_nr, parent);
1259         } else {
1260                 dout("readdir_prepopulate %d items under dn %p\n",
1261                      rinfo->dir_nr, parent);
1262                 if (rinfo->dir_dir)
1263                         ceph_fill_dirfrag(parent->d_inode, rinfo->dir_dir);
1264         }
1265
1266         for (i = 0; i < rinfo->dir_nr; i++) {
1267                 struct ceph_vino vino;
1268
1269                 dname.name = rinfo->dir_dname[i];
1270                 dname.len = rinfo->dir_dname_len[i];
1271                 dname.hash = full_name_hash(dname.name, dname.len);
1272
1273                 vino.ino = le64_to_cpu(rinfo->dir_in[i].in->ino);
1274                 vino.snap = le64_to_cpu(rinfo->dir_in[i].in->snapid);
1275
1276 retry_lookup:
1277                 dn = d_lookup(parent, &dname);
1278                 dout("d_lookup on parent=%p name=%.*s got %p\n",
1279                      parent, dname.len, dname.name, dn);
1280
1281                 if (!dn) {
1282                         dn = d_alloc(parent, &dname);
1283                         dout("d_alloc %p '%.*s' = %p\n", parent,
1284                              dname.len, dname.name, dn);
1285                         if (dn == NULL) {
1286                                 dout("d_alloc badness\n");
1287                                 err = -ENOMEM;
1288                                 goto out;
1289                         }
1290                         err = ceph_init_dentry(dn);
1291                         if (err < 0) {
1292                                 dput(dn);
1293                                 goto out;
1294                         }
1295                 } else if (dn->d_inode &&
1296                            (ceph_ino(dn->d_inode) != vino.ino ||
1297                             ceph_snap(dn->d_inode) != vino.snap)) {
1298                         dout(" dn %p points to wrong inode %p\n",
1299                              dn, dn->d_inode);
1300                         d_delete(dn);
1301                         dput(dn);
1302                         goto retry_lookup;
1303                 } else {
1304                         /* reorder parent's d_subdirs */
1305                         spin_lock(&parent->d_lock);
1306                         spin_lock_nested(&dn->d_lock, DENTRY_D_LOCK_NESTED);
1307                         list_move(&dn->d_u.d_child, &parent->d_subdirs);
1308                         spin_unlock(&dn->d_lock);
1309                         spin_unlock(&parent->d_lock);
1310                 }
1311
1312                 di = dn->d_fsdata;
1313                 di->offset = ceph_make_fpos(frag, i + req->r_readdir_offset);
1314
1315                 /* inode */
1316                 if (dn->d_inode) {
1317                         in = dn->d_inode;
1318                 } else {
1319                         in = ceph_get_inode(parent->d_sb, vino);
1320                         if (IS_ERR(in)) {
1321                                 dout("new_inode badness\n");
1322                                 d_drop(dn);
1323                                 dput(dn);
1324                                 err = PTR_ERR(in);
1325                                 goto out;
1326                         }
1327                         dn = splice_dentry(dn, in, NULL, false);
1328                         if (IS_ERR(dn))
1329                                 dn = NULL;
1330                 }
1331
1332                 if (fill_inode(in, &rinfo->dir_in[i], NULL, session,
1333                                req->r_request_started, -1,
1334                                &req->r_caps_reservation) < 0) {
1335                         pr_err("fill_inode badness on %p\n", in);
1336                         goto next_item;
1337                 }
1338                 if (dn)
1339                         update_dentry_lease(dn, rinfo->dir_dlease[i],
1340                                             req->r_session,
1341                                             req->r_request_started);
1342 next_item:
1343                 if (dn)
1344                         dput(dn);
1345         }
1346         req->r_did_prepopulate = true;
1347
1348 out:
1349         if (snapdir) {
1350                 iput(snapdir);
1351                 dput(parent);
1352         }
1353         dout("readdir_prepopulate done\n");
1354         return err;
1355 }
1356
1357 int ceph_inode_set_size(struct inode *inode, loff_t size)
1358 {
1359         struct ceph_inode_info *ci = ceph_inode(inode);
1360         int ret = 0;
1361
1362         spin_lock(&ci->i_ceph_lock);
1363         dout("set_size %p %llu -> %llu\n", inode, inode->i_size, size);
1364         inode->i_size = size;
1365         inode->i_blocks = (size + (1 << 9) - 1) >> 9;
1366
1367         /* tell the MDS if we are approaching max_size */
1368         if ((size << 1) >= ci->i_max_size &&
1369             (ci->i_reported_size << 1) < ci->i_max_size)
1370                 ret = 1;
1371
1372         spin_unlock(&ci->i_ceph_lock);
1373         return ret;
1374 }
1375
1376 /*
1377  * Write back inode data in a worker thread.  (This can't be done
1378  * in the message handler context.)
1379  */
1380 void ceph_queue_writeback(struct inode *inode)
1381 {
1382         ihold(inode);
1383         if (queue_work(ceph_inode_to_client(inode)->wb_wq,
1384                        &ceph_inode(inode)->i_wb_work)) {
1385                 dout("ceph_queue_writeback %p\n", inode);
1386         } else {
1387                 dout("ceph_queue_writeback %p failed\n", inode);
1388                 iput(inode);
1389         }
1390 }
1391
1392 static void ceph_writeback_work(struct work_struct *work)
1393 {
1394         struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1395                                                   i_wb_work);
1396         struct inode *inode = &ci->vfs_inode;
1397
1398         dout("writeback %p\n", inode);
1399         filemap_fdatawrite(&inode->i_data);
1400         iput(inode);
1401 }
1402
1403 /*
1404  * queue an async invalidation
1405  */
1406 void ceph_queue_invalidate(struct inode *inode)
1407 {
1408         ihold(inode);
1409         if (queue_work(ceph_inode_to_client(inode)->pg_inv_wq,
1410                        &ceph_inode(inode)->i_pg_inv_work)) {
1411                 dout("ceph_queue_invalidate %p\n", inode);
1412         } else {
1413                 dout("ceph_queue_invalidate %p failed\n", inode);
1414                 iput(inode);
1415         }
1416 }
1417
1418 /*
1419  * Invalidate inode pages in a worker thread.  (This can't be done
1420  * in the message handler context.)
1421  */
1422 static void ceph_invalidate_work(struct work_struct *work)
1423 {
1424         struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1425                                                   i_pg_inv_work);
1426         struct inode *inode = &ci->vfs_inode;
1427         u32 orig_gen;
1428         int check = 0;
1429
1430         spin_lock(&ci->i_ceph_lock);
1431         dout("invalidate_pages %p gen %d revoking %d\n", inode,
1432              ci->i_rdcache_gen, ci->i_rdcache_revoking);
1433         if (ci->i_rdcache_revoking != ci->i_rdcache_gen) {
1434                 /* nevermind! */
1435                 spin_unlock(&ci->i_ceph_lock);
1436                 goto out;
1437         }
1438         orig_gen = ci->i_rdcache_gen;
1439         spin_unlock(&ci->i_ceph_lock);
1440
1441         truncate_inode_pages(&inode->i_data, 0);
1442
1443         spin_lock(&ci->i_ceph_lock);
1444         if (orig_gen == ci->i_rdcache_gen &&
1445             orig_gen == ci->i_rdcache_revoking) {
1446                 dout("invalidate_pages %p gen %d successful\n", inode,
1447                      ci->i_rdcache_gen);
1448                 ci->i_rdcache_revoking--;
1449                 check = 1;
1450         } else {
1451                 dout("invalidate_pages %p gen %d raced, now %d revoking %d\n",
1452                      inode, orig_gen, ci->i_rdcache_gen,
1453                      ci->i_rdcache_revoking);
1454         }
1455         spin_unlock(&ci->i_ceph_lock);
1456
1457         if (check)
1458                 ceph_check_caps(ci, 0, NULL);
1459 out:
1460         iput(inode);
1461 }
1462
1463
1464 /*
1465  * called by trunc_wq;
1466  *
1467  * We also truncate in a separate thread as well.
1468  */
1469 static void ceph_vmtruncate_work(struct work_struct *work)
1470 {
1471         struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1472                                                   i_vmtruncate_work);
1473         struct inode *inode = &ci->vfs_inode;
1474
1475         dout("vmtruncate_work %p\n", inode);
1476         if (!mutex_trylock(&inode->i_mutex)) {
1477                 /*
1478                  * the i_mutex can be hold by a writer who is waiting for
1479                  * caps. wake up waiters, they will do pending vmtruncate.
1480                  */
1481                 wake_up_all(&ci->i_cap_wq);
1482                 mutex_lock(&inode->i_mutex);
1483         }
1484         __ceph_do_pending_vmtruncate(inode);
1485         mutex_unlock(&inode->i_mutex);
1486         iput(inode);
1487 }
1488
1489 /*
1490  * Queue an async vmtruncate.  If we fail to queue work, we will handle
1491  * the truncation the next time we call __ceph_do_pending_vmtruncate.
1492  */
1493 void ceph_queue_vmtruncate(struct inode *inode)
1494 {
1495         struct ceph_inode_info *ci = ceph_inode(inode);
1496
1497         ihold(inode);
1498         if (queue_work(ceph_sb_to_client(inode->i_sb)->trunc_wq,
1499                        &ci->i_vmtruncate_work)) {
1500                 dout("ceph_queue_vmtruncate %p\n", inode);
1501         } else {
1502                 dout("ceph_queue_vmtruncate %p failed, pending=%d\n",
1503                      inode, ci->i_truncate_pending);
1504                 iput(inode);
1505         }
1506 }
1507
1508 /*
1509  * Make sure any pending truncation is applied before doing anything
1510  * that may depend on it.
1511  */
1512 void __ceph_do_pending_vmtruncate(struct inode *inode)
1513 {
1514         struct ceph_inode_info *ci = ceph_inode(inode);
1515         u64 to;
1516         int wrbuffer_refs, finish = 0;
1517
1518 retry:
1519         spin_lock(&ci->i_ceph_lock);
1520         if (ci->i_truncate_pending == 0) {
1521                 dout("__do_pending_vmtruncate %p none pending\n", inode);
1522                 spin_unlock(&ci->i_ceph_lock);
1523                 return;
1524         }
1525
1526         /*
1527          * make sure any dirty snapped pages are flushed before we
1528          * possibly truncate them.. so write AND block!
1529          */
1530         if (ci->i_wrbuffer_ref_head < ci->i_wrbuffer_ref) {
1531                 dout("__do_pending_vmtruncate %p flushing snaps first\n",
1532                      inode);
1533                 spin_unlock(&ci->i_ceph_lock);
1534                 filemap_write_and_wait_range(&inode->i_data, 0,
1535                                              inode->i_sb->s_maxbytes);
1536                 goto retry;
1537         }
1538
1539         to = ci->i_truncate_size;
1540         wrbuffer_refs = ci->i_wrbuffer_ref;
1541         dout("__do_pending_vmtruncate %p (%d) to %lld\n", inode,
1542              ci->i_truncate_pending, to);
1543         spin_unlock(&ci->i_ceph_lock);
1544
1545         truncate_inode_pages(inode->i_mapping, to);
1546
1547         spin_lock(&ci->i_ceph_lock);
1548         if (to == ci->i_truncate_size) {
1549                 ci->i_truncate_pending = 0;
1550                 finish = 1;
1551         }
1552         spin_unlock(&ci->i_ceph_lock);
1553         if (!finish)
1554                 goto retry;
1555
1556         if (wrbuffer_refs == 0)
1557                 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
1558
1559         wake_up_all(&ci->i_cap_wq);
1560 }
1561
1562
1563 /*
1564  * symlinks
1565  */
1566 static void *ceph_sym_follow_link(struct dentry *dentry, struct nameidata *nd)
1567 {
1568         struct ceph_inode_info *ci = ceph_inode(dentry->d_inode);
1569         nd_set_link(nd, ci->i_symlink);
1570         return NULL;
1571 }
1572
1573 static const struct inode_operations ceph_symlink_iops = {
1574         .readlink = generic_readlink,
1575         .follow_link = ceph_sym_follow_link,
1576         .setattr = ceph_setattr,
1577         .getattr = ceph_getattr,
1578         .setxattr = ceph_setxattr,
1579         .getxattr = ceph_getxattr,
1580         .listxattr = ceph_listxattr,
1581         .removexattr = ceph_removexattr,
1582 };
1583
1584 /*
1585  * setattr
1586  */
1587 int ceph_setattr(struct dentry *dentry, struct iattr *attr)
1588 {
1589         struct inode *inode = dentry->d_inode;
1590         struct ceph_inode_info *ci = ceph_inode(inode);
1591         struct inode *parent_inode;
1592         const unsigned int ia_valid = attr->ia_valid;
1593         struct ceph_mds_request *req;
1594         struct ceph_mds_client *mdsc = ceph_sb_to_client(dentry->d_sb)->mdsc;
1595         int issued;
1596         int release = 0, dirtied = 0;
1597         int mask = 0;
1598         int err = 0;
1599         int inode_dirty_flags = 0;
1600
1601         if (ceph_snap(inode) != CEPH_NOSNAP)
1602                 return -EROFS;
1603
1604         __ceph_do_pending_vmtruncate(inode);
1605
1606         err = inode_change_ok(inode, attr);
1607         if (err != 0)
1608                 return err;
1609
1610         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETATTR,
1611                                        USE_AUTH_MDS);
1612         if (IS_ERR(req))
1613                 return PTR_ERR(req);
1614
1615         spin_lock(&ci->i_ceph_lock);
1616         issued = __ceph_caps_issued(ci, NULL);
1617         dout("setattr %p issued %s\n", inode, ceph_cap_string(issued));
1618
1619         if (ia_valid & ATTR_UID) {
1620                 dout("setattr %p uid %d -> %d\n", inode,
1621                      from_kuid(&init_user_ns, inode->i_uid),
1622                      from_kuid(&init_user_ns, attr->ia_uid));
1623                 if (issued & CEPH_CAP_AUTH_EXCL) {
1624                         inode->i_uid = attr->ia_uid;
1625                         dirtied |= CEPH_CAP_AUTH_EXCL;
1626                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1627                            !uid_eq(attr->ia_uid, inode->i_uid)) {
1628                         req->r_args.setattr.uid = cpu_to_le32(
1629                                 from_kuid(&init_user_ns, attr->ia_uid));
1630                         mask |= CEPH_SETATTR_UID;
1631                         release |= CEPH_CAP_AUTH_SHARED;
1632                 }
1633         }
1634         if (ia_valid & ATTR_GID) {
1635                 dout("setattr %p gid %d -> %d\n", inode,
1636                      from_kgid(&init_user_ns, inode->i_gid),
1637                      from_kgid(&init_user_ns, attr->ia_gid));
1638                 if (issued & CEPH_CAP_AUTH_EXCL) {
1639                         inode->i_gid = attr->ia_gid;
1640                         dirtied |= CEPH_CAP_AUTH_EXCL;
1641                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1642                            !gid_eq(attr->ia_gid, inode->i_gid)) {
1643                         req->r_args.setattr.gid = cpu_to_le32(
1644                                 from_kgid(&init_user_ns, attr->ia_gid));
1645                         mask |= CEPH_SETATTR_GID;
1646                         release |= CEPH_CAP_AUTH_SHARED;
1647                 }
1648         }
1649         if (ia_valid & ATTR_MODE) {
1650                 dout("setattr %p mode 0%o -> 0%o\n", inode, inode->i_mode,
1651                      attr->ia_mode);
1652                 if (issued & CEPH_CAP_AUTH_EXCL) {
1653                         inode->i_mode = attr->ia_mode;
1654                         dirtied |= CEPH_CAP_AUTH_EXCL;
1655                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1656                            attr->ia_mode != inode->i_mode) {
1657                         req->r_args.setattr.mode = cpu_to_le32(attr->ia_mode);
1658                         mask |= CEPH_SETATTR_MODE;
1659                         release |= CEPH_CAP_AUTH_SHARED;
1660                 }
1661         }
1662
1663         if (ia_valid & ATTR_ATIME) {
1664                 dout("setattr %p atime %ld.%ld -> %ld.%ld\n", inode,
1665                      inode->i_atime.tv_sec, inode->i_atime.tv_nsec,
1666                      attr->ia_atime.tv_sec, attr->ia_atime.tv_nsec);
1667                 if (issued & CEPH_CAP_FILE_EXCL) {
1668                         ci->i_time_warp_seq++;
1669                         inode->i_atime = attr->ia_atime;
1670                         dirtied |= CEPH_CAP_FILE_EXCL;
1671                 } else if ((issued & CEPH_CAP_FILE_WR) &&
1672                            timespec_compare(&inode->i_atime,
1673                                             &attr->ia_atime) < 0) {
1674                         inode->i_atime = attr->ia_atime;
1675                         dirtied |= CEPH_CAP_FILE_WR;
1676                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1677                            !timespec_equal(&inode->i_atime, &attr->ia_atime)) {
1678                         ceph_encode_timespec(&req->r_args.setattr.atime,
1679                                              &attr->ia_atime);
1680                         mask |= CEPH_SETATTR_ATIME;
1681                         release |= CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_RD |
1682                                 CEPH_CAP_FILE_WR;
1683                 }
1684         }
1685         if (ia_valid & ATTR_MTIME) {
1686                 dout("setattr %p mtime %ld.%ld -> %ld.%ld\n", inode,
1687                      inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
1688                      attr->ia_mtime.tv_sec, attr->ia_mtime.tv_nsec);
1689                 if (issued & CEPH_CAP_FILE_EXCL) {
1690                         ci->i_time_warp_seq++;
1691                         inode->i_mtime = attr->ia_mtime;
1692                         dirtied |= CEPH_CAP_FILE_EXCL;
1693                 } else if ((issued & CEPH_CAP_FILE_WR) &&
1694                            timespec_compare(&inode->i_mtime,
1695                                             &attr->ia_mtime) < 0) {
1696                         inode->i_mtime = attr->ia_mtime;
1697                         dirtied |= CEPH_CAP_FILE_WR;
1698                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1699                            !timespec_equal(&inode->i_mtime, &attr->ia_mtime)) {
1700                         ceph_encode_timespec(&req->r_args.setattr.mtime,
1701                                              &attr->ia_mtime);
1702                         mask |= CEPH_SETATTR_MTIME;
1703                         release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD |
1704                                 CEPH_CAP_FILE_WR;
1705                 }
1706         }
1707         if (ia_valid & ATTR_SIZE) {
1708                 dout("setattr %p size %lld -> %lld\n", inode,
1709                      inode->i_size, attr->ia_size);
1710                 if (attr->ia_size > inode->i_sb->s_maxbytes) {
1711                         err = -EINVAL;
1712                         goto out;
1713                 }
1714                 if ((issued & CEPH_CAP_FILE_EXCL) &&
1715                     attr->ia_size > inode->i_size) {
1716                         inode->i_size = attr->ia_size;
1717                         inode->i_blocks =
1718                                 (attr->ia_size + (1 << 9) - 1) >> 9;
1719                         inode->i_ctime = attr->ia_ctime;
1720                         ci->i_reported_size = attr->ia_size;
1721                         dirtied |= CEPH_CAP_FILE_EXCL;
1722                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1723                            attr->ia_size != inode->i_size) {
1724                         req->r_args.setattr.size = cpu_to_le64(attr->ia_size);
1725                         req->r_args.setattr.old_size =
1726                                 cpu_to_le64(inode->i_size);
1727                         mask |= CEPH_SETATTR_SIZE;
1728                         release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD |
1729                                 CEPH_CAP_FILE_WR;
1730                 }
1731         }
1732
1733         /* these do nothing */
1734         if (ia_valid & ATTR_CTIME) {
1735                 bool only = (ia_valid & (ATTR_SIZE|ATTR_MTIME|ATTR_ATIME|
1736                                          ATTR_MODE|ATTR_UID|ATTR_GID)) == 0;
1737                 dout("setattr %p ctime %ld.%ld -> %ld.%ld (%s)\n", inode,
1738                      inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
1739                      attr->ia_ctime.tv_sec, attr->ia_ctime.tv_nsec,
1740                      only ? "ctime only" : "ignored");
1741                 inode->i_ctime = attr->ia_ctime;
1742                 if (only) {
1743                         /*
1744                          * if kernel wants to dirty ctime but nothing else,
1745                          * we need to choose a cap to dirty under, or do
1746                          * a almost-no-op setattr
1747                          */
1748                         if (issued & CEPH_CAP_AUTH_EXCL)
1749                                 dirtied |= CEPH_CAP_AUTH_EXCL;
1750                         else if (issued & CEPH_CAP_FILE_EXCL)
1751                                 dirtied |= CEPH_CAP_FILE_EXCL;
1752                         else if (issued & CEPH_CAP_XATTR_EXCL)
1753                                 dirtied |= CEPH_CAP_XATTR_EXCL;
1754                         else
1755                                 mask |= CEPH_SETATTR_CTIME;
1756                 }
1757         }
1758         if (ia_valid & ATTR_FILE)
1759                 dout("setattr %p ATTR_FILE ... hrm!\n", inode);
1760
1761         if (dirtied) {
1762                 inode_dirty_flags = __ceph_mark_dirty_caps(ci, dirtied);
1763                 inode->i_ctime = CURRENT_TIME;
1764         }
1765
1766         release &= issued;
1767         spin_unlock(&ci->i_ceph_lock);
1768
1769         if (inode_dirty_flags)
1770                 __mark_inode_dirty(inode, inode_dirty_flags);
1771
1772         if (mask) {
1773                 req->r_inode = inode;
1774                 ihold(inode);
1775                 req->r_inode_drop = release;
1776                 req->r_args.setattr.mask = cpu_to_le32(mask);
1777                 req->r_num_caps = 1;
1778                 parent_inode = ceph_get_dentry_parent_inode(dentry);
1779                 err = ceph_mdsc_do_request(mdsc, parent_inode, req);
1780                 iput(parent_inode);
1781         }
1782         dout("setattr %p result=%d (%s locally, %d remote)\n", inode, err,
1783              ceph_cap_string(dirtied), mask);
1784
1785         ceph_mdsc_put_request(req);
1786         __ceph_do_pending_vmtruncate(inode);
1787         return err;
1788 out:
1789         spin_unlock(&ci->i_ceph_lock);
1790         ceph_mdsc_put_request(req);
1791         return err;
1792 }
1793
1794 /*
1795  * Verify that we have a lease on the given mask.  If not,
1796  * do a getattr against an mds.
1797  */
1798 int ceph_do_getattr(struct inode *inode, int mask)
1799 {
1800         struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
1801         struct ceph_mds_client *mdsc = fsc->mdsc;
1802         struct ceph_mds_request *req;
1803         int err;
1804
1805         if (ceph_snap(inode) == CEPH_SNAPDIR) {
1806                 dout("do_getattr inode %p SNAPDIR\n", inode);
1807                 return 0;
1808         }
1809
1810         dout("do_getattr inode %p mask %s mode 0%o\n", inode, ceph_cap_string(mask), inode->i_mode);
1811         if (ceph_caps_issued_mask(ceph_inode(inode), mask, 1))
1812                 return 0;
1813
1814         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
1815         if (IS_ERR(req))
1816                 return PTR_ERR(req);
1817         req->r_inode = inode;
1818         ihold(inode);
1819         req->r_num_caps = 1;
1820         req->r_args.getattr.mask = cpu_to_le32(mask);
1821         err = ceph_mdsc_do_request(mdsc, NULL, req);
1822         ceph_mdsc_put_request(req);
1823         dout("do_getattr result=%d\n", err);
1824         return err;
1825 }
1826
1827
1828 /*
1829  * Check inode permissions.  We verify we have a valid value for
1830  * the AUTH cap, then call the generic handler.
1831  */
1832 int ceph_permission(struct inode *inode, int mask)
1833 {
1834         int err;
1835
1836         if (mask & MAY_NOT_BLOCK)
1837                 return -ECHILD;
1838
1839         err = ceph_do_getattr(inode, CEPH_CAP_AUTH_SHARED);
1840
1841         if (!err)
1842                 err = generic_permission(inode, mask);
1843         return err;
1844 }
1845
1846 /*
1847  * Get all attributes.  Hopefully somedata we'll have a statlite()
1848  * and can limit the fields we require to be accurate.
1849  */
1850 int ceph_getattr(struct vfsmount *mnt, struct dentry *dentry,
1851                  struct kstat *stat)
1852 {
1853         struct inode *inode = dentry->d_inode;
1854         struct ceph_inode_info *ci = ceph_inode(inode);
1855         int err;
1856
1857         err = ceph_do_getattr(inode, CEPH_STAT_CAP_INODE_ALL);
1858         if (!err) {
1859                 generic_fillattr(inode, stat);
1860                 stat->ino = ceph_translate_ino(inode->i_sb, inode->i_ino);
1861                 if (ceph_snap(inode) != CEPH_NOSNAP)
1862                         stat->dev = ceph_snap(inode);
1863                 else
1864                         stat->dev = 0;
1865                 if (S_ISDIR(inode->i_mode)) {
1866                         if (ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb),
1867                                                 RBYTES))
1868                                 stat->size = ci->i_rbytes;
1869                         else
1870                                 stat->size = ci->i_files + ci->i_subdirs;
1871                         stat->blocks = 0;
1872                         stat->blksize = 65536;
1873                 }
1874         }
1875         return err;
1876 }