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