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 = make_kuid(&init_user_ns, le32_to_cpu(info->uid));
 616                 inode->i_gid = make_kgid(&init_user_ns, le32_to_cpu(info->gid));
 617                 dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode,
 618                      from_kuid(&init_user_ns, inode->i_uid),
 619                      from_kgid(&init_user_ns, inode->i_gid));
 620         }
 621
 622         if ((issued & CEPH_CAP_LINK_EXCL) == 0)
 623                 set_nlink(inode, le32_to_cpu(info->nlink));
 624
 625         /* be careful with mtime, atime, size */
 626         ceph_decode_timespec(&atime, &info->atime);
 627         ceph_decode_timespec(&mtime, &info->mtime);
 628         ceph_decode_timespec(&ctime, &info->ctime);
 629         queue_trunc = ceph_fill_file_size(inode, issued,
 630                                           le32_to_cpu(info->truncate_seq),
 631                                           le64_to_cpu(info->truncate_size),
 632                                           le64_to_cpu(info->size));
 633         ceph_fill_file_time(inode, issued,
 634                             le32_to_cpu(info->time_warp_seq),
 635                             &ctime, &mtime, &atime);
 636
 637         /* only update max_size on auth cap */
 638         if ((info->cap.flags & CEPH_CAP_FLAG_AUTH) &&
 639             ci->i_max_size != le64_to_cpu(info->max_size)) {
 640                 dout("max_size %lld -> %llu\n", ci->i_max_size,
 641                      le64_to_cpu(info->max_size));
 642                 ci->i_max_size = le64_to_cpu(info->max_size);
 643         }
 644
 645         ci->i_layout = info->layout;
 646         inode->i_blkbits = fls(le32_to_cpu(info->layout.fl_stripe_unit)) - 1;
 647
 648         /* xattrs */
 649         /* note that if i_xattrs.len <= 4, i_xattrs.data will still be NULL. */
 650         if ((issued & CEPH_CAP_XATTR_EXCL) == 0 &&
 651             le64_to_cpu(info->xattr_version) > ci->i_xattrs.version) {
 652                 if (ci->i_xattrs.blob)
 653                         ceph_buffer_put(ci->i_xattrs.blob);
 654                 ci->i_xattrs.blob = xattr_blob;
 655                 if (xattr_blob)
 656                         memcpy(ci->i_xattrs.blob->vec.iov_base,
 657                                iinfo->xattr_data, iinfo->xattr_len);
 658                 ci->i_xattrs.version = le64_to_cpu(info->xattr_version);
 659                 xattr_blob = NULL;
 660         }
 661
 662         inode->i_mapping->a_ops = &ceph_aops;
 663         inode->i_mapping->backing_dev_info =
 664                 &ceph_sb_to_client(inode->i_sb)->backing_dev_info;
 665
 666         switch (inode->i_mode & S_IFMT) {
 667         case S_IFIFO:
 668         case S_IFBLK:
 669         case S_IFCHR:
 670         case S_IFSOCK:
 671                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
 672                 inode->i_op = &ceph_file_iops;
 673                 break;
 674         case S_IFREG:
 675                 inode->i_op = &ceph_file_iops;
 676                 inode->i_fop = &ceph_file_fops;
 677                 break;
 678         case S_IFLNK:
 679                 inode->i_op = &ceph_symlink_iops;
 680                 if (!ci->i_symlink) {
 681                         u32 symlen = iinfo->symlink_len;
 682                         char *sym;
 683
 684                         spin_unlock(&ci->i_ceph_lock);
 685
 686                         err = -EINVAL;
 687                         if (WARN_ON(symlen != inode->i_size))
 688                                 goto out;
 689
 690                         err = -ENOMEM;
 691                         sym = kstrndup(iinfo->symlink, symlen, GFP_NOFS);
 692                         if (!sym)
 693                                 goto out;
 694
 695                         spin_lock(&ci->i_ceph_lock);
 696                         if (!ci->i_symlink)
 697                                 ci->i_symlink = sym;
 698                         else
 699                                 kfree(sym); /* lost a race */
 700                 }
 701                 break;
 702         case S_IFDIR:
 703                 inode->i_op = &ceph_dir_iops;
 704                 inode->i_fop = &ceph_dir_fops;
 705
 706                 ci->i_dir_layout = iinfo->dir_layout;
 707
 708                 ci->i_files = le64_to_cpu(info->files);
 709                 ci->i_subdirs = le64_to_cpu(info->subdirs);
 710                 ci->i_rbytes = le64_to_cpu(info->rbytes);
 711                 ci->i_rfiles = le64_to_cpu(info->rfiles);
 712                 ci->i_rsubdirs = le64_to_cpu(info->rsubdirs);
 713                 ceph_decode_timespec(&ci->i_rctime, &info->rctime);
 714                 break;
 715         default:
 716                 pr_err("fill_inode %llx.%llx BAD mode 0%o\n",
 717                        ceph_vinop(inode), inode->i_mode);
 718         }
 719
 720 no_change:
 721         spin_unlock(&ci->i_ceph_lock);
 722
 723         /* queue truncate if we saw i_size decrease */
 724         if (queue_trunc)
 725                 ceph_queue_vmtruncate(inode);
 726
 727         /* populate frag tree */
 728         /* FIXME: move me up, if/when version reflects fragtree changes */
 729         nsplits = le32_to_cpu(info->fragtree.nsplits);
 730         mutex_lock(&ci->i_fragtree_mutex);
 731         for (i = 0; i < nsplits; i++) {
 732                 u32 id = le32_to_cpu(info->fragtree.splits[i].frag);
 733                 struct ceph_inode_frag *frag = __get_or_create_frag(ci, id);
 734
 735                 if (IS_ERR(frag))
 736                         continue;
 737                 frag->split_by = le32_to_cpu(info->fragtree.splits[i].by);
 738                 dout(" frag %x split by %d\n", frag->frag, frag->split_by);
 739         }
 740         mutex_unlock(&ci->i_fragtree_mutex);
 741
 742         /* were we issued a capability? */
 743         if (info->cap.caps) {
 744                 if (ceph_snap(inode) == CEPH_NOSNAP) {
 745                         ceph_add_cap(inode, session,
 746                                      le64_to_cpu(info->cap.cap_id),
 747                                      cap_fmode,
 748                                      le32_to_cpu(info->cap.caps),
 749                                      le32_to_cpu(info->cap.wanted),
 750                                      le32_to_cpu(info->cap.seq),
 751                                      le32_to_cpu(info->cap.mseq),
 752                                      le64_to_cpu(info->cap.realm),
 753                                      info->cap.flags,
 754                                      caps_reservation);
 755                 } else {
 756                         spin_lock(&ci->i_ceph_lock);
 757                         dout(" %p got snap_caps %s\n", inode,
 758                              ceph_cap_string(le32_to_cpu(info->cap.caps)));
 759                         ci->i_snap_caps |= le32_to_cpu(info->cap.caps);
 760                         if (cap_fmode >= 0)
 761                                 __ceph_get_fmode(ci, cap_fmode);
 762                         spin_unlock(&ci->i_ceph_lock);
 763                 }
 764         } else if (cap_fmode >= 0) {
 765                 pr_warning("mds issued no caps on %llx.%llx\n",
 766                            ceph_vinop(inode));
 767                 __ceph_get_fmode(ci, cap_fmode);
 768         }
 769
 770         /* set dir completion flag? */
 771         if (S_ISDIR(inode->i_mode) &&
 772             updating_inode &&                 /* didn't jump to no_change */
 773             ci->i_files == 0 && ci->i_subdirs == 0 &&
 774             ceph_snap(inode) == CEPH_NOSNAP &&
 775             (le32_to_cpu(info->cap.caps) & CEPH_CAP_FILE_SHARED) &&
 776             (issued & CEPH_CAP_FILE_EXCL) == 0 &&
 777             !ceph_dir_test_complete(inode)) {
 778                 dout(" marking %p complete (empty)\n", inode);
 779                 ceph_dir_set_complete(inode);
 780                 ci->i_max_offset = 2;
 781         }
 782
 783         /* update delegation info? */
 784         if (dirinfo)
 785                 ceph_fill_dirfrag(inode, dirinfo);
 786
 787         err = 0;
 788
 789 out:
 790         if (xattr_blob)
 791                 ceph_buffer_put(xattr_blob);
 792         return err;
 793 }
 794
 795 /*
 796  * caller should hold session s_mutex.
 797  */
 798 static void update_dentry_lease(struct dentry *dentry,
 799                                 struct ceph_mds_reply_lease *lease,
 800                                 struct ceph_mds_session *session,
 801                                 unsigned long from_time)
 802 {
 803         struct ceph_dentry_info *di = ceph_dentry(dentry);
 804         long unsigned duration = le32_to_cpu(lease->duration_ms);
 805         long unsigned ttl = from_time + (duration * HZ) / 1000;
 806         long unsigned half_ttl = from_time + (duration * HZ / 2) / 1000;
 807         struct inode *dir;
 808
 809         /* only track leases on regular dentries */
 810         if (dentry->d_op != &ceph_dentry_ops)
 811                 return;
 812
 813         spin_lock(&dentry->d_lock);
 814         dout("update_dentry_lease %p duration %lu ms ttl %lu\n",
 815              dentry, duration, ttl);
 816
 817         /* make lease_rdcache_gen match directory */
 818         dir = dentry->d_parent->d_inode;
 819         di->lease_shared_gen = ceph_inode(dir)->i_shared_gen;
 820
 821         if (duration == 0)
 822                 goto out_unlock;
 823
 824         if (di->lease_gen == session->s_cap_gen &&
 825             time_before(ttl, dentry->d_time))
 826                 goto out_unlock;  /* we already have a newer lease. */
 827
 828         if (di->lease_session && di->lease_session != session)
 829                 goto out_unlock;
 830
 831         ceph_dentry_lru_touch(dentry);
 832
 833         if (!di->lease_session)
 834                 di->lease_session = ceph_get_mds_session(session);
 835         di->lease_gen = session->s_cap_gen;
 836         di->lease_seq = le32_to_cpu(lease->seq);
 837         di->lease_renew_after = half_ttl;
 838         di->lease_renew_from = 0;
 839         dentry->d_time = ttl;
 840 out_unlock:
 841         spin_unlock(&dentry->d_lock);
 842         return;
 843 }
 844
 845 /*
 846  * Set dentry's directory position based on the current dir's max, and
 847  * order it in d_subdirs, so that dcache_readdir behaves.
 848  *
 849  * Always called under directory's i_mutex.
 850  */
 851 static void ceph_set_dentry_offset(struct dentry *dn)
 852 {
 853         struct dentry *dir = dn->d_parent;
 854         struct inode *inode = dir->d_inode;
 855         struct ceph_inode_info *ci;
 856         struct ceph_dentry_info *di;
 857
 858         BUG_ON(!inode);
 859
 860         ci = ceph_inode(inode);
 861         di = ceph_dentry(dn);
 862
 863         spin_lock(&ci->i_ceph_lock);
 864         if (!ceph_dir_test_complete(inode)) {
 865                 spin_unlock(&ci->i_ceph_lock);
 866                 return;
 867         }
 868         di->offset = ceph_inode(inode)->i_max_offset++;
 869         spin_unlock(&ci->i_ceph_lock);
 870
 871         spin_lock(&dir->d_lock);
 872         spin_lock_nested(&dn->d_lock, DENTRY_D_LOCK_NESTED);
 873         list_move(&dn->d_u.d_child, &dir->d_subdirs);
 874         dout("set_dentry_offset %p %lld (%p %p)\n", dn, di->offset,
 875              dn->d_u.d_child.prev, dn->d_u.d_child.next);
 876         spin_unlock(&dn->d_lock);
 877         spin_unlock(&dir->d_lock);
 878 }
 879
 880 /*
 881  * splice a dentry to an inode.
 882  * caller must hold directory i_mutex for this to be safe.
 883  *
 884  * we will only rehash the resulting dentry if @prehash is
 885  * true; @prehash will be set to false (for the benefit of
 886  * the caller) if we fail.
 887  */
 888 static struct dentry *splice_dentry(struct dentry *dn, struct inode *in,
 889                                     bool *prehash, bool set_offset)
 890 {
 891         struct dentry *realdn;
 892
 893         BUG_ON(dn->d_inode);
 894
 895         /* dn must be unhashed */
 896         if (!d_unhashed(dn))
 897                 d_drop(dn);
 898         realdn = d_materialise_unique(dn, in);
 899         if (IS_ERR(realdn)) {
 900                 pr_err("splice_dentry error %ld %p inode %p ino %llx.%llx\n",
 901                        PTR_ERR(realdn), dn, in, ceph_vinop(in));
 902                 if (prehash)
 903                         *prehash = false; /* don't rehash on error */
 904                 dn = realdn; /* note realdn contains the error */
 905                 goto out;
 906         } else if (realdn) {
 907                 dout("dn %p (%d) spliced with %p (%d) "
 908                      "inode %p ino %llx.%llx\n",
 909                      dn, dn->d_count,
 910                      realdn, realdn->d_count,
 911                      realdn->d_inode, ceph_vinop(realdn->d_inode));
 912                 dput(dn);
 913                 dn = realdn;
 914         } else {
 915                 BUG_ON(!ceph_dentry(dn));
 916                 dout("dn %p attached to %p ino %llx.%llx\n",
 917                      dn, dn->d_inode, ceph_vinop(dn->d_inode));
 918         }
 919         if ((!prehash || *prehash) && d_unhashed(dn))
 920                 d_rehash(dn);
 921         if (set_offset)
 922                 ceph_set_dentry_offset(dn);
 923 out:
 924         return dn;
 925 }
 926
 927 /*
 928  * Incorporate results into the local cache.  This is either just
 929  * one inode, or a directory, dentry, and possibly linked-to inode (e.g.,
 930  * after a lookup).
 931  *
 932  * A reply may contain
 933  *         a directory inode along with a dentry.
 934  *  and/or a target inode
 935  *
 936  * Called with snap_rwsem (read).
 937  */
 938 int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req,
 939                     struct ceph_mds_session *session)
 940 {
 941         struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
 942         struct inode *in = NULL;
 943         struct ceph_mds_reply_inode *ininfo;
 944         struct ceph_vino vino;
 945         struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
 946         int i = 0;
 947         int err = 0;
 948
 949         dout("fill_trace %p is_dentry %d is_target %d\n", req,
 950              rinfo->head->is_dentry, rinfo->head->is_target);
 951
 952 #if 0
 953         /*
 954          * Debugging hook:
 955          *
 956          * If we resend completed ops to a recovering mds, we get no
 957          * trace.  Since that is very rare, pretend this is the case
 958          * to ensure the 'no trace' handlers in the callers behave.
 959          *
 960          * Fill in inodes unconditionally to avoid breaking cap
 961          * invariants.
 962          */
 963         if (rinfo->head->op & CEPH_MDS_OP_WRITE) {
 964                 pr_info("fill_trace faking empty trace on %lld %s\n",
 965                         req->r_tid, ceph_mds_op_name(rinfo->head->op));
 966                 if (rinfo->head->is_dentry) {
 967                         rinfo->head->is_dentry = 0;
 968                         err = fill_inode(req->r_locked_dir,
 969                                          &rinfo->diri, rinfo->dirfrag,
 970                                          session, req->r_request_started, -1);
 971                 }
 972                 if (rinfo->head->is_target) {
 973                         rinfo->head->is_target = 0;
 974                         ininfo = rinfo->targeti.in;
 975                         vino.ino = le64_to_cpu(ininfo->ino);
 976                         vino.snap = le64_to_cpu(ininfo->snapid);
 977                         in = ceph_get_inode(sb, vino);
 978                         err = fill_inode(in, &rinfo->targeti, NULL,
 979                                          session, req->r_request_started,
 980                                          req->r_fmode);
 981                         iput(in);
 982                 }
 983         }
 984 #endif
 985
 986         if (!rinfo->head->is_target && !rinfo->head->is_dentry) {
 987                 dout("fill_trace reply is empty!\n");
 988                 if (rinfo->head->result == 0 && req->r_locked_dir)
 989                         ceph_invalidate_dir_request(req);
 990                 return 0;
 991         }
 992
 993         if (rinfo->head->is_dentry) {
 994                 struct inode *dir = req->r_locked_dir;
 995
 996                 if (dir) {
 997                         err = fill_inode(dir, &rinfo->diri, rinfo->dirfrag,
 998                                          session, req->r_request_started, -1,
 999                                          &req->r_caps_reservation);
1000                         if (err < 0)
1001                                 return err;
1002                 } else {
1003                         WARN_ON_ONCE(1);
1004                 }
1005         }
1006
1007         /*
1008          * ignore null lease/binding on snapdir ENOENT, or else we
1009          * will have trouble splicing in the virtual snapdir later
1010          */
1011         if (rinfo->head->is_dentry && !req->r_aborted &&
1012             req->r_locked_dir &&
1013             (rinfo->head->is_target || strncmp(req->r_dentry->d_name.name,
1014                                                fsc->mount_options->snapdir_name,
1015                                                req->r_dentry->d_name.len))) {
1016                 /*
1017                  * lookup link rename   : null -> possibly existing inode
1018                  * mknod symlink mkdir  : null -> new inode
1019                  * unlink               : linked -> null
1020                  */
1021                 struct inode *dir = req->r_locked_dir;
1022                 struct dentry *dn = req->r_dentry;
1023                 bool have_dir_cap, have_lease;
1024
1025                 BUG_ON(!dn);
1026                 BUG_ON(!dir);
1027                 BUG_ON(dn->d_parent->d_inode != dir);
1028                 BUG_ON(ceph_ino(dir) !=
1029                        le64_to_cpu(rinfo->diri.in->ino));
1030                 BUG_ON(ceph_snap(dir) !=
1031                        le64_to_cpu(rinfo->diri.in->snapid));
1032
1033                 /* do we have a lease on the whole dir? */
1034                 have_dir_cap =
1035                         (le32_to_cpu(rinfo->diri.in->cap.caps) &
1036                          CEPH_CAP_FILE_SHARED);
1037
1038                 /* do we have a dn lease? */
1039                 have_lease = have_dir_cap ||
1040                         le32_to_cpu(rinfo->dlease->duration_ms);
1041                 if (!have_lease)
1042                         dout("fill_trace  no dentry lease or dir cap\n");
1043
1044                 /* rename? */
1045                 if (req->r_old_dentry && req->r_op == CEPH_MDS_OP_RENAME) {
1046                         dout(" src %p '%.*s' dst %p '%.*s'\n",
1047                              req->r_old_dentry,
1048                              req->r_old_dentry->d_name.len,
1049                              req->r_old_dentry->d_name.name,
1050                              dn, dn->d_name.len, dn->d_name.name);
1051                         dout("fill_trace doing d_move %p -> %p\n",
1052                              req->r_old_dentry, dn);
1053
1054                         d_move(req->r_old_dentry, dn);
1055                         dout(" src %p '%.*s' dst %p '%.*s'\n",
1056                              req->r_old_dentry,
1057                              req->r_old_dentry->d_name.len,
1058                              req->r_old_dentry->d_name.name,
1059                              dn, dn->d_name.len, dn->d_name.name);
1060
1061                         /* ensure target dentry is invalidated, despite
1062                            rehashing bug in vfs_rename_dir */
1063                         ceph_invalidate_dentry_lease(dn);
1064
1065                         /*
1066                          * d_move() puts the renamed dentry at the end of
1067                          * d_subdirs.  We need to assign it an appropriate
1068                          * directory offset so we can behave when holding
1069                          * D_COMPLETE.
1070                          */
1071                         ceph_set_dentry_offset(req->r_old_dentry);
1072                         dout("dn %p gets new offset %lld\n", req->r_old_dentry,
1073                              ceph_dentry(req->r_old_dentry)->offset);
1074
1075                         dn = req->r_old_dentry;  /* use old_dentry */
1076                         in = dn->d_inode;
1077                 }
1078
1079                 /* null dentry? */
1080                 if (!rinfo->head->is_target) {
1081                         dout("fill_trace null dentry\n");
1082                         if (dn->d_inode) {
1083                                 dout("d_delete %p\n", dn);
1084                                 d_delete(dn);
1085                         } else {
1086                                 dout("d_instantiate %p NULL\n", dn);
1087                                 d_instantiate(dn, NULL);
1088                                 if (have_lease && d_unhashed(dn))
1089                                         d_rehash(dn);
1090                                 update_dentry_lease(dn, rinfo->dlease,
1091                                                     session,
1092                                                     req->r_request_started);
1093                         }
1094                         goto done;
1095                 }
1096
1097                 /* attach proper inode */
1098                 ininfo = rinfo->targeti.in;
1099                 vino.ino = le64_to_cpu(ininfo->ino);
1100                 vino.snap = le64_to_cpu(ininfo->snapid);
1101                 in = dn->d_inode;
1102                 if (!in) {
1103                         in = ceph_get_inode(sb, vino);
1104                         if (IS_ERR(in)) {
1105                                 pr_err("fill_trace bad get_inode "
1106                                        "%llx.%llx\n", vino.ino, vino.snap);
1107                                 err = PTR_ERR(in);
1108                                 d_drop(dn);
1109                                 goto done;
1110                         }
1111                         dn = splice_dentry(dn, in, &have_lease, true);
1112                         if (IS_ERR(dn)) {
1113                                 err = PTR_ERR(dn);
1114                                 goto done;
1115                         }
1116                         req->r_dentry = dn;  /* may have spliced */
1117                         ihold(in);
1118                 } else if (ceph_ino(in) == vino.ino &&
1119                            ceph_snap(in) == vino.snap) {
1120                         ihold(in);
1121                 } else {
1122                         dout(" %p links to %p %llx.%llx, not %llx.%llx\n",
1123                              dn, in, ceph_ino(in), ceph_snap(in),
1124                              vino.ino, vino.snap);
1125                         have_lease = false;
1126                         in = NULL;
1127                 }
1128
1129                 if (have_lease)
1130                         update_dentry_lease(dn, rinfo->dlease, session,
1131                                             req->r_request_started);
1132                 dout(" final dn %p\n", dn);
1133                 i++;
1134         } else if (req->r_op == CEPH_MDS_OP_LOOKUPSNAP ||
1135                    req->r_op == CEPH_MDS_OP_MKSNAP) {
1136                 struct dentry *dn = req->r_dentry;
1137
1138                 /* fill out a snapdir LOOKUPSNAP dentry */
1139                 BUG_ON(!dn);
1140                 BUG_ON(!req->r_locked_dir);
1141                 BUG_ON(ceph_snap(req->r_locked_dir) != CEPH_SNAPDIR);
1142                 ininfo = rinfo->targeti.in;
1143                 vino.ino = le64_to_cpu(ininfo->ino);
1144                 vino.snap = le64_to_cpu(ininfo->snapid);
1145                 in = ceph_get_inode(sb, vino);
1146                 if (IS_ERR(in)) {
1147                         pr_err("fill_inode get_inode badness %llx.%llx\n",
1148                                vino.ino, vino.snap);
1149                         err = PTR_ERR(in);
1150                         d_delete(dn);
1151                         goto done;
1152                 }
1153                 dout(" linking snapped dir %p to dn %p\n", in, dn);
1154                 dn = splice_dentry(dn, in, NULL, true);
1155                 if (IS_ERR(dn)) {
1156                         err = PTR_ERR(dn);
1157                         goto done;
1158                 }
1159                 req->r_dentry = dn;  /* may have spliced */
1160                 ihold(in);
1161                 rinfo->head->is_dentry = 1;  /* fool notrace handlers */
1162         }
1163
1164         if (rinfo->head->is_target) {
1165                 vino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1166                 vino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1167
1168                 if (in == NULL || ceph_ino(in) != vino.ino ||
1169                     ceph_snap(in) != vino.snap) {
1170                         in = ceph_get_inode(sb, vino);
1171                         if (IS_ERR(in)) {
1172                                 err = PTR_ERR(in);
1173                                 goto done;
1174                         }
1175                 }
1176                 req->r_target_inode = in;
1177
1178                 err = fill_inode(in,
1179                                  &rinfo->targeti, NULL,
1180                                  session, req->r_request_started,
1181                                  (le32_to_cpu(rinfo->head->result) == 0) ?
1182                                  req->r_fmode : -1,
1183                                  &req->r_caps_reservation);
1184                 if (err < 0) {
1185                         pr_err("fill_inode badness %p %llx.%llx\n",
1186                                in, ceph_vinop(in));
1187                         goto done;
1188                 }
1189         }
1190
1191 done:
1192         dout("fill_trace done err=%d\n", err);
1193         return err;
1194 }
1195
1196 /*
1197  * Prepopulate our cache with readdir results, leases, etc.
1198  */
1199 int ceph_readdir_prepopulate(struct ceph_mds_request *req,
1200                              struct ceph_mds_session *session)
1201 {
1202         struct dentry *parent = req->r_dentry;
1203         struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1204         struct qstr dname;
1205         struct dentry *dn;
1206         struct inode *in;
1207         int err = 0, i;
1208         struct inode *snapdir = NULL;
1209         struct ceph_mds_request_head *rhead = req->r_request->front.iov_base;
1210         u64 frag = le32_to_cpu(rhead->args.readdir.frag);
1211         struct ceph_dentry_info *di;
1212
1213         if (le32_to_cpu(rinfo->head->op) == CEPH_MDS_OP_LSSNAP) {
1214                 snapdir = ceph_get_snapdir(parent->d_inode);
1215                 parent = d_find_alias(snapdir);
1216                 dout("readdir_prepopulate %d items under SNAPDIR dn %p\n",
1217                      rinfo->dir_nr, parent);
1218         } else {
1219                 dout("readdir_prepopulate %d items under dn %p\n",
1220                      rinfo->dir_nr, parent);
1221                 if (rinfo->dir_dir)
1222                         ceph_fill_dirfrag(parent->d_inode, rinfo->dir_dir);
1223         }
1224
1225         for (i = 0; i < rinfo->dir_nr; i++) {
1226                 struct ceph_vino vino;
1227
1228                 dname.name = rinfo->dir_dname[i];
1229                 dname.len = rinfo->dir_dname_len[i];
1230                 dname.hash = full_name_hash(dname.name, dname.len);
1231
1232                 vino.ino = le64_to_cpu(rinfo->dir_in[i].in->ino);
1233                 vino.snap = le64_to_cpu(rinfo->dir_in[i].in->snapid);
1234
1235 retry_lookup:
1236                 dn = d_lookup(parent, &dname);
1237                 dout("d_lookup on parent=%p name=%.*s got %p\n",
1238                      parent, dname.len, dname.name, dn);
1239
1240                 if (!dn) {
1241                         dn = d_alloc(parent, &dname);
1242                         dout("d_alloc %p '%.*s' = %p\n", parent,
1243                              dname.len, dname.name, dn);
1244                         if (dn == NULL) {
1245                                 dout("d_alloc badness\n");
1246                                 err = -ENOMEM;
1247                                 goto out;
1248                         }
1249                         err = ceph_init_dentry(dn);
1250                         if (err < 0) {
1251                                 dput(dn);
1252                                 goto out;
1253                         }
1254                 } else if (dn->d_inode &&
1255                            (ceph_ino(dn->d_inode) != vino.ino ||
1256                             ceph_snap(dn->d_inode) != vino.snap)) {
1257                         dout(" dn %p points to wrong inode %p\n",
1258                              dn, dn->d_inode);
1259                         d_delete(dn);
1260                         dput(dn);
1261                         goto retry_lookup;
1262                 } else {
1263                         /* reorder parent's d_subdirs */
1264                         spin_lock(&parent->d_lock);
1265                         spin_lock_nested(&dn->d_lock, DENTRY_D_LOCK_NESTED);
1266                         list_move(&dn->d_u.d_child, &parent->d_subdirs);
1267                         spin_unlock(&dn->d_lock);
1268                         spin_unlock(&parent->d_lock);
1269                 }
1270
1271                 di = dn->d_fsdata;
1272                 di->offset = ceph_make_fpos(frag, i + req->r_readdir_offset);
1273
1274                 /* inode */
1275                 if (dn->d_inode) {
1276                         in = dn->d_inode;
1277                 } else {
1278                         in = ceph_get_inode(parent->d_sb, vino);
1279                         if (IS_ERR(in)) {
1280                                 dout("new_inode badness\n");
1281                                 d_drop(dn);
1282                                 dput(dn);
1283                                 err = PTR_ERR(in);
1284                                 goto out;
1285                         }
1286                         dn = splice_dentry(dn, in, NULL, false);
1287                         if (IS_ERR(dn))
1288                                 dn = NULL;
1289                 }
1290
1291                 if (fill_inode(in, &rinfo->dir_in[i], NULL, session,
1292                                req->r_request_started, -1,
1293                                &req->r_caps_reservation) < 0) {
1294                         pr_err("fill_inode badness on %p\n", in);
1295                         goto next_item;
1296                 }
1297                 if (dn)
1298                         update_dentry_lease(dn, rinfo->dir_dlease[i],
1299                                             req->r_session,
1300                                             req->r_request_started);
1301 next_item:
1302                 if (dn)
1303                         dput(dn);
1304         }
1305         req->r_did_prepopulate = true;
1306
1307 out:
1308         if (snapdir) {
1309                 iput(snapdir);
1310                 dput(parent);
1311         }
1312         dout("readdir_prepopulate done\n");
1313         return err;
1314 }
1315
1316 int ceph_inode_set_size(struct inode *inode, loff_t size)
1317 {
1318         struct ceph_inode_info *ci = ceph_inode(inode);
1319         int ret = 0;
1320
1321         spin_lock(&ci->i_ceph_lock);
1322         dout("set_size %p %llu -> %llu\n", inode, inode->i_size, size);
1323         inode->i_size = size;
1324         inode->i_blocks = (size + (1 << 9) - 1) >> 9;
1325
1326         /* tell the MDS if we are approaching max_size */
1327         if ((size << 1) >= ci->i_max_size &&
1328             (ci->i_reported_size << 1) < ci->i_max_size)
1329                 ret = 1;
1330
1331         spin_unlock(&ci->i_ceph_lock);
1332         return ret;
1333 }
1334
1335 /*
1336  * Write back inode data in a worker thread.  (This can't be done
1337  * in the message handler context.)
1338  */
1339 void ceph_queue_writeback(struct inode *inode)
1340 {
1341         ihold(inode);
1342         if (queue_work(ceph_inode_to_client(inode)->wb_wq,
1343                        &ceph_inode(inode)->i_wb_work)) {
1344                 dout("ceph_queue_writeback %p\n", inode);
1345         } else {
1346                 dout("ceph_queue_writeback %p failed\n", inode);
1347                 iput(inode);
1348         }
1349 }
1350
1351 static void ceph_writeback_work(struct work_struct *work)
1352 {
1353         struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1354                                                   i_wb_work);
1355         struct inode *inode = &ci->vfs_inode;
1356
1357         dout("writeback %p\n", inode);
1358         filemap_fdatawrite(&inode->i_data);
1359         iput(inode);
1360 }
1361
1362 /*
1363  * queue an async invalidation
1364  */
1365 void ceph_queue_invalidate(struct inode *inode)
1366 {
1367         ihold(inode);
1368         if (queue_work(ceph_inode_to_client(inode)->pg_inv_wq,
1369                        &ceph_inode(inode)->i_pg_inv_work)) {
1370                 dout("ceph_queue_invalidate %p\n", inode);
1371         } else {
1372                 dout("ceph_queue_invalidate %p failed\n", inode);
1373                 iput(inode);
1374         }
1375 }
1376
1377 /*
1378  * Invalidate inode pages in a worker thread.  (This can't be done
1379  * in the message handler context.)
1380  */
1381 static void ceph_invalidate_work(struct work_struct *work)
1382 {
1383         struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1384                                                   i_pg_inv_work);
1385         struct inode *inode = &ci->vfs_inode;
1386         u32 orig_gen;
1387         int check = 0;
1388
1389         spin_lock(&ci->i_ceph_lock);
1390         dout("invalidate_pages %p gen %d revoking %d\n", inode,
1391              ci->i_rdcache_gen, ci->i_rdcache_revoking);
1392         if (ci->i_rdcache_revoking != ci->i_rdcache_gen) {
1393                 /* nevermind! */
1394                 spin_unlock(&ci->i_ceph_lock);
1395                 goto out;
1396         }
1397         orig_gen = ci->i_rdcache_gen;
1398         spin_unlock(&ci->i_ceph_lock);
1399
1400         truncate_inode_pages(&inode->i_data, 0);
1401
1402         spin_lock(&ci->i_ceph_lock);
1403         if (orig_gen == ci->i_rdcache_gen &&
1404             orig_gen == ci->i_rdcache_revoking) {
1405                 dout("invalidate_pages %p gen %d successful\n", inode,
1406                      ci->i_rdcache_gen);
1407                 ci->i_rdcache_revoking--;
1408                 check = 1;
1409         } else {
1410                 dout("invalidate_pages %p gen %d raced, now %d revoking %d\n",
1411                      inode, orig_gen, ci->i_rdcache_gen,
1412                      ci->i_rdcache_revoking);
1413         }
1414         spin_unlock(&ci->i_ceph_lock);
1415
1416         if (check)
1417                 ceph_check_caps(ci, 0, NULL);
1418 out:
1419         iput(inode);
1420 }
1421
1422
1423 /*
1424  * called by trunc_wq; take i_mutex ourselves
1425  *
1426  * We also truncate in a separate thread as well.
1427  */
1428 static void ceph_vmtruncate_work(struct work_struct *work)
1429 {
1430         struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1431                                                   i_vmtruncate_work);
1432         struct inode *inode = &ci->vfs_inode;
1433
1434         dout("vmtruncate_work %p\n", inode);
1435         mutex_lock(&inode->i_mutex);
1436         __ceph_do_pending_vmtruncate(inode);
1437         mutex_unlock(&inode->i_mutex);
1438         iput(inode);
1439 }
1440
1441 /*
1442  * Queue an async vmtruncate.  If we fail to queue work, we will handle
1443  * the truncation the next time we call __ceph_do_pending_vmtruncate.
1444  */
1445 void ceph_queue_vmtruncate(struct inode *inode)
1446 {
1447         struct ceph_inode_info *ci = ceph_inode(inode);
1448
1449         ihold(inode);
1450         if (queue_work(ceph_sb_to_client(inode->i_sb)->trunc_wq,
1451                        &ci->i_vmtruncate_work)) {
1452                 dout("ceph_queue_vmtruncate %p\n", inode);
1453         } else {
1454                 dout("ceph_queue_vmtruncate %p failed, pending=%d\n",
1455                      inode, ci->i_truncate_pending);
1456                 iput(inode);
1457         }
1458 }
1459
1460 /*
1461  * called with i_mutex held.
1462  *
1463  * Make sure any pending truncation is applied before doing anything
1464  * that may depend on it.
1465  */
1466 void __ceph_do_pending_vmtruncate(struct inode *inode)
1467 {
1468         struct ceph_inode_info *ci = ceph_inode(inode);
1469         u64 to;
1470         int wrbuffer_refs, finish = 0;
1471
1472 retry:
1473         spin_lock(&ci->i_ceph_lock);
1474         if (ci->i_truncate_pending == 0) {
1475                 dout("__do_pending_vmtruncate %p none pending\n", inode);
1476                 spin_unlock(&ci->i_ceph_lock);
1477                 return;
1478         }
1479
1480         /*
1481          * make sure any dirty snapped pages are flushed before we
1482          * possibly truncate them.. so write AND block!
1483          */
1484         if (ci->i_wrbuffer_ref_head < ci->i_wrbuffer_ref) {
1485                 dout("__do_pending_vmtruncate %p flushing snaps first\n",
1486                      inode);
1487                 spin_unlock(&ci->i_ceph_lock);
1488                 filemap_write_and_wait_range(&inode->i_data, 0,
1489                                              inode->i_sb->s_maxbytes);
1490                 goto retry;
1491         }
1492
1493         to = ci->i_truncate_size;
1494         wrbuffer_refs = ci->i_wrbuffer_ref;
1495         dout("__do_pending_vmtruncate %p (%d) to %lld\n", inode,
1496              ci->i_truncate_pending, to);
1497         spin_unlock(&ci->i_ceph_lock);
1498
1499         truncate_inode_pages(inode->i_mapping, to);
1500
1501         spin_lock(&ci->i_ceph_lock);
1502         if (to == ci->i_truncate_size) {
1503                 ci->i_truncate_pending = 0;
1504                 finish = 1;
1505         }
1506         spin_unlock(&ci->i_ceph_lock);
1507         if (!finish)
1508                 goto retry;
1509
1510         if (wrbuffer_refs == 0)
1511                 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
1512
1513         wake_up_all(&ci->i_cap_wq);
1514 }
1515
1516
1517 /*
1518  * symlinks
1519  */
1520 static void *ceph_sym_follow_link(struct dentry *dentry, struct nameidata *nd)
1521 {
1522         struct ceph_inode_info *ci = ceph_inode(dentry->d_inode);
1523         nd_set_link(nd, ci->i_symlink);
1524         return NULL;
1525 }
1526
1527 static const struct inode_operations ceph_symlink_iops = {
1528         .readlink = generic_readlink,
1529         .follow_link = ceph_sym_follow_link,
1530 };
1531
1532 /*
1533  * setattr
1534  */
1535 int ceph_setattr(struct dentry *dentry, struct iattr *attr)
1536 {
1537         struct inode *inode = dentry->d_inode;
1538         struct ceph_inode_info *ci = ceph_inode(inode);
1539         struct inode *parent_inode;
1540         const unsigned int ia_valid = attr->ia_valid;
1541         struct ceph_mds_request *req;
1542         struct ceph_mds_client *mdsc = ceph_sb_to_client(dentry->d_sb)->mdsc;
1543         int issued;
1544         int release = 0, dirtied = 0;
1545         int mask = 0;
1546         int err = 0;
1547         int inode_dirty_flags = 0;
1548
1549         if (ceph_snap(inode) != CEPH_NOSNAP)
1550                 return -EROFS;
1551
1552         __ceph_do_pending_vmtruncate(inode);
1553
1554         err = inode_change_ok(inode, attr);
1555         if (err != 0)
1556                 return err;
1557
1558         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETATTR,
1559                                        USE_AUTH_MDS);
1560         if (IS_ERR(req))
1561                 return PTR_ERR(req);
1562
1563         spin_lock(&ci->i_ceph_lock);
1564         issued = __ceph_caps_issued(ci, NULL);
1565         dout("setattr %p issued %s\n", inode, ceph_cap_string(issued));
1566
1567         if (ia_valid & ATTR_UID) {
1568                 dout("setattr %p uid %d -> %d\n", inode,
1569                      from_kuid(&init_user_ns, inode->i_uid),
1570                      from_kuid(&init_user_ns, attr->ia_uid));
1571                 if (issued & CEPH_CAP_AUTH_EXCL) {
1572                         inode->i_uid = attr->ia_uid;
1573                         dirtied |= CEPH_CAP_AUTH_EXCL;
1574                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1575                            !uid_eq(attr->ia_uid, inode->i_uid)) {
1576                         req->r_args.setattr.uid = cpu_to_le32(
1577                                 from_kuid(&init_user_ns, attr->ia_uid));
1578                         mask |= CEPH_SETATTR_UID;
1579                         release |= CEPH_CAP_AUTH_SHARED;
1580                 }
1581         }
1582         if (ia_valid & ATTR_GID) {
1583                 dout("setattr %p gid %d -> %d\n", inode,
1584                      from_kgid(&init_user_ns, inode->i_gid),
1585                      from_kgid(&init_user_ns, attr->ia_gid));
1586                 if (issued & CEPH_CAP_AUTH_EXCL) {
1587                         inode->i_gid = attr->ia_gid;
1588                         dirtied |= CEPH_CAP_AUTH_EXCL;
1589                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1590                            !gid_eq(attr->ia_gid, inode->i_gid)) {
1591                         req->r_args.setattr.gid = cpu_to_le32(
1592                                 from_kgid(&init_user_ns, attr->ia_gid));
1593                         mask |= CEPH_SETATTR_GID;
1594                         release |= CEPH_CAP_AUTH_SHARED;
1595                 }
1596         }
1597         if (ia_valid & ATTR_MODE) {
1598                 dout("setattr %p mode 0%o -> 0%o\n", inode, inode->i_mode,
1599                      attr->ia_mode);
1600                 if (issued & CEPH_CAP_AUTH_EXCL) {
1601                         inode->i_mode = attr->ia_mode;
1602                         dirtied |= CEPH_CAP_AUTH_EXCL;
1603                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1604                            attr->ia_mode != inode->i_mode) {
1605                         req->r_args.setattr.mode = cpu_to_le32(attr->ia_mode);
1606                         mask |= CEPH_SETATTR_MODE;
1607                         release |= CEPH_CAP_AUTH_SHARED;
1608                 }
1609         }
1610
1611         if (ia_valid & ATTR_ATIME) {
1612                 dout("setattr %p atime %ld.%ld -> %ld.%ld\n", inode,
1613                      inode->i_atime.tv_sec, inode->i_atime.tv_nsec,
1614                      attr->ia_atime.tv_sec, attr->ia_atime.tv_nsec);
1615                 if (issued & CEPH_CAP_FILE_EXCL) {
1616                         ci->i_time_warp_seq++;
1617                         inode->i_atime = attr->ia_atime;
1618                         dirtied |= CEPH_CAP_FILE_EXCL;
1619                 } else if ((issued & CEPH_CAP_FILE_WR) &&
1620                            timespec_compare(&inode->i_atime,
1621                                             &attr->ia_atime) < 0) {
1622                         inode->i_atime = attr->ia_atime;
1623                         dirtied |= CEPH_CAP_FILE_WR;
1624                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1625                            !timespec_equal(&inode->i_atime, &attr->ia_atime)) {
1626                         ceph_encode_timespec(&req->r_args.setattr.atime,
1627                                              &attr->ia_atime);
1628                         mask |= CEPH_SETATTR_ATIME;
1629                         release |= CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_RD |
1630                                 CEPH_CAP_FILE_WR;
1631                 }
1632         }
1633         if (ia_valid & ATTR_MTIME) {
1634                 dout("setattr %p mtime %ld.%ld -> %ld.%ld\n", inode,
1635                      inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
1636                      attr->ia_mtime.tv_sec, attr->ia_mtime.tv_nsec);
1637                 if (issued & CEPH_CAP_FILE_EXCL) {
1638                         ci->i_time_warp_seq++;
1639                         inode->i_mtime = attr->ia_mtime;
1640                         dirtied |= CEPH_CAP_FILE_EXCL;
1641                 } else if ((issued & CEPH_CAP_FILE_WR) &&
1642                            timespec_compare(&inode->i_mtime,
1643                                             &attr->ia_mtime) < 0) {
1644                         inode->i_mtime = attr->ia_mtime;
1645                         dirtied |= CEPH_CAP_FILE_WR;
1646                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1647                            !timespec_equal(&inode->i_mtime, &attr->ia_mtime)) {
1648                         ceph_encode_timespec(&req->r_args.setattr.mtime,
1649                                              &attr->ia_mtime);
1650                         mask |= CEPH_SETATTR_MTIME;
1651                         release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD |
1652                                 CEPH_CAP_FILE_WR;
1653                 }
1654         }
1655         if (ia_valid & ATTR_SIZE) {
1656                 dout("setattr %p size %lld -> %lld\n", inode,
1657                      inode->i_size, attr->ia_size);
1658                 if (attr->ia_size > inode->i_sb->s_maxbytes) {
1659                         err = -EINVAL;
1660                         goto out;
1661                 }
1662                 if ((issued & CEPH_CAP_FILE_EXCL) &&
1663                     attr->ia_size > inode->i_size) {
1664                         inode->i_size = attr->ia_size;
1665                         inode->i_blocks =
1666                                 (attr->ia_size + (1 << 9) - 1) >> 9;
1667                         inode->i_ctime = attr->ia_ctime;
1668                         ci->i_reported_size = attr->ia_size;
1669                         dirtied |= CEPH_CAP_FILE_EXCL;
1670                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1671                            attr->ia_size != inode->i_size) {
1672                         req->r_args.setattr.size = cpu_to_le64(attr->ia_size);
1673                         req->r_args.setattr.old_size =
1674                                 cpu_to_le64(inode->i_size);
1675                         mask |= CEPH_SETATTR_SIZE;
1676                         release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD |
1677                                 CEPH_CAP_FILE_WR;
1678                 }
1679         }
1680
1681         /* these do nothing */
1682         if (ia_valid & ATTR_CTIME) {
1683                 bool only = (ia_valid & (ATTR_SIZE|ATTR_MTIME|ATTR_ATIME|
1684                                          ATTR_MODE|ATTR_UID|ATTR_GID)) == 0;
1685                 dout("setattr %p ctime %ld.%ld -> %ld.%ld (%s)\n", inode,
1686                      inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
1687                      attr->ia_ctime.tv_sec, attr->ia_ctime.tv_nsec,
1688                      only ? "ctime only" : "ignored");
1689                 inode->i_ctime = attr->ia_ctime;
1690                 if (only) {
1691                         /*
1692                          * if kernel wants to dirty ctime but nothing else,
1693                          * we need to choose a cap to dirty under, or do
1694                          * a almost-no-op setattr
1695                          */
1696                         if (issued & CEPH_CAP_AUTH_EXCL)
1697                                 dirtied |= CEPH_CAP_AUTH_EXCL;
1698                         else if (issued & CEPH_CAP_FILE_EXCL)
1699                                 dirtied |= CEPH_CAP_FILE_EXCL;
1700                         else if (issued & CEPH_CAP_XATTR_EXCL)
1701                                 dirtied |= CEPH_CAP_XATTR_EXCL;
1702                         else
1703                                 mask |= CEPH_SETATTR_CTIME;
1704                 }
1705         }
1706         if (ia_valid & ATTR_FILE)
1707                 dout("setattr %p ATTR_FILE ... hrm!\n", inode);
1708
1709         if (dirtied) {
1710                 inode_dirty_flags = __ceph_mark_dirty_caps(ci, dirtied);
1711                 inode->i_ctime = CURRENT_TIME;
1712         }
1713
1714         release &= issued;
1715         spin_unlock(&ci->i_ceph_lock);
1716
1717         if (inode_dirty_flags)
1718                 __mark_inode_dirty(inode, inode_dirty_flags);
1719
1720         if (mask) {
1721                 req->r_inode = inode;
1722                 ihold(inode);
1723                 req->r_inode_drop = release;
1724                 req->r_args.setattr.mask = cpu_to_le32(mask);
1725                 req->r_num_caps = 1;
1726                 parent_inode = ceph_get_dentry_parent_inode(dentry);
1727                 err = ceph_mdsc_do_request(mdsc, parent_inode, req);
1728                 iput(parent_inode);
1729         }
1730         dout("setattr %p result=%d (%s locally, %d remote)\n", inode, err,
1731              ceph_cap_string(dirtied), mask);
1732
1733         ceph_mdsc_put_request(req);
1734         __ceph_do_pending_vmtruncate(inode);
1735         return err;
1736 out:
1737         spin_unlock(&ci->i_ceph_lock);
1738         ceph_mdsc_put_request(req);
1739         return err;
1740 }
1741
1742 /*
1743  * Verify that we have a lease on the given mask.  If not,
1744  * do a getattr against an mds.
1745  */
1746 int ceph_do_getattr(struct inode *inode, int mask)
1747 {
1748         struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
1749         struct ceph_mds_client *mdsc = fsc->mdsc;
1750         struct ceph_mds_request *req;
1751         int err;
1752
1753         if (ceph_snap(inode) == CEPH_SNAPDIR) {
1754                 dout("do_getattr inode %p SNAPDIR\n", inode);
1755                 return 0;
1756         }
1757
1758         dout("do_getattr inode %p mask %s mode 0%o\n", inode, ceph_cap_string(mask), inode->i_mode);
1759         if (ceph_caps_issued_mask(ceph_inode(inode), mask, 1))
1760                 return 0;
1761
1762         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
1763         if (IS_ERR(req))
1764                 return PTR_ERR(req);
1765         req->r_inode = inode;
1766         ihold(inode);
1767         req->r_num_caps = 1;
1768         req->r_args.getattr.mask = cpu_to_le32(mask);
1769         err = ceph_mdsc_do_request(mdsc, NULL, req);
1770         ceph_mdsc_put_request(req);
1771         dout("do_getattr result=%d\n", err);
1772         return err;
1773 }
1774
1775
1776 /*
1777  * Check inode permissions.  We verify we have a valid value for
1778  * the AUTH cap, then call the generic handler.
1779  */
1780 int ceph_permission(struct inode *inode, int mask)
1781 {
1782         int err;
1783
1784         if (mask & MAY_NOT_BLOCK)
1785                 return -ECHILD;
1786
1787         err = ceph_do_getattr(inode, CEPH_CAP_AUTH_SHARED);
1788
1789         if (!err)
1790                 err = generic_permission(inode, mask);
1791         return err;
1792 }
1793
1794 /*
1795  * Get all attributes.  Hopefully somedata we'll have a statlite()
1796  * and can limit the fields we require to be accurate.
1797  */
1798 int ceph_getattr(struct vfsmount *mnt, struct dentry *dentry,
1799                  struct kstat *stat)
1800 {
1801         struct inode *inode = dentry->d_inode;
1802         struct ceph_inode_info *ci = ceph_inode(inode);
1803         int err;
1804
1805         err = ceph_do_getattr(inode, CEPH_STAT_CAP_INODE_ALL);
1806         if (!err) {
1807                 generic_fillattr(inode, stat);
1808                 stat->ino = ceph_translate_ino(inode->i_sb, inode->i_ino);
1809                 if (ceph_snap(inode) != CEPH_NOSNAP)
1810                         stat->dev = ceph_snap(inode);
1811                 else
1812                         stat->dev = 0;
1813                 if (S_ISDIR(inode->i_mode)) {
1814                         if (ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb),
1815                                                 RBYTES))
1816                                 stat->size = ci->i_rbytes;
1817                         else
1818                                 stat->size = ci->i_files + ci->i_subdirs;
1819                         stat->blocks = 0;
1820                         stat->blksize = 65536;
1821                 }
1822         }
1823         return err;
1824 }