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 "cache.h"
  16 #include <linux/ceph/decode.h>
  17
  18 /*
  19  * Ceph inode operations
  20  *
  21  * Implement basic inode helpers (get, alloc) and inode ops (getattr,
  22  * setattr, etc.), xattr helpers, and helpers for assimilating
  23  * metadata returned by the MDS into our cache.
  24  *
  25  * Also define helpers for doing asynchronous writeback, invalidation,
  26  * and truncation for the benefit of those who can't afford to block
  27  * (typically because they are in the message handler path).
  28  */
  29
  30 static const struct inode_operations ceph_symlink_iops;
  31
  32 static void ceph_invalidate_work(struct work_struct *work);
  33 static void ceph_writeback_work(struct work_struct *work);
  34 static void ceph_vmtruncate_work(struct work_struct *work);
  35
  36 /*
  37  * find or create an inode, given the ceph ino number
  38  */
  39 static int ceph_set_ino_cb(struct inode *inode, void *data)
  40 {
  41         ceph_inode(inode)->i_vino = *(struct ceph_vino *)data;
  42         inode->i_ino = ceph_vino_to_ino(*(struct ceph_vino *)data);
  43         return 0;
  44 }
  45
  46 struct inode *ceph_get_inode(struct super_block *sb, struct ceph_vino vino)
  47 {
  48         struct inode *inode;
  49         ino_t t = ceph_vino_to_ino(vino);
  50
  51         inode = iget5_locked(sb, t, ceph_ino_compare, ceph_set_ino_cb, &vino);
  52         if (inode == NULL)
  53                 return ERR_PTR(-ENOMEM);
  54         if (inode->i_state & I_NEW) {
  55                 dout("get_inode created new inode %p %llx.%llx ino %llx\n",
  56                      inode, ceph_vinop(inode), (u64)inode->i_ino);
  57                 unlock_new_inode(inode);
  58         }
  59
  60         dout("get_inode on %lu=%llx.%llx got %p\n", inode->i_ino, vino.ino,
  61              vino.snap, inode);
  62         return inode;
  63 }
  64
  65 /*
  66  * get/constuct snapdir inode for a given directory
  67  */
  68 struct inode *ceph_get_snapdir(struct inode *parent)
  69 {
  70         struct ceph_vino vino = {
  71                 .ino = ceph_ino(parent),
  72                 .snap = CEPH_SNAPDIR,
  73         };
  74         struct inode *inode = ceph_get_inode(parent->i_sb, vino);
  75         struct ceph_inode_info *ci = ceph_inode(inode);
  76
  77         BUG_ON(!S_ISDIR(parent->i_mode));
  78         if (IS_ERR(inode))
  79                 return inode;
  80         inode->i_mode = parent->i_mode;
  81         inode->i_uid = parent->i_uid;
  82         inode->i_gid = parent->i_gid;
  83         inode->i_op = &ceph_dir_iops;
  84         inode->i_fop = &ceph_dir_fops;
  85         ci->i_snap_caps = CEPH_CAP_PIN; /* so we can open */
  86         ci->i_rbytes = 0;
  87         return inode;
  88 }
  89
  90 const struct inode_operations ceph_file_iops = {
  91         .permission = ceph_permission,
  92         .setattr = ceph_setattr,
  93         .getattr = ceph_getattr,
  94         .setxattr = ceph_setxattr,
  95         .getxattr = ceph_getxattr,
  96         .listxattr = ceph_listxattr,
  97         .removexattr = ceph_removexattr,
  98 };
  99
 100
 101 /*
 102  * We use a 'frag tree' to keep track of the MDS's directory fragments
 103  * for a given inode (usually there is just a single fragment).  We
 104  * need to know when a child frag is delegated to a new MDS, or when
 105  * it is flagged as replicated, so we can direct our requests
 106  * accordingly.
 107  */
 108
 109 /*
 110  * find/create a frag in the tree
 111  */
 112 static struct ceph_inode_frag *__get_or_create_frag(struct ceph_inode_info *ci,
 113                                                     u32 f)
 114 {
 115         struct rb_node **p;
 116         struct rb_node *parent = NULL;
 117         struct ceph_inode_frag *frag;
 118         int c;
 119
 120         p = &ci->i_fragtree.rb_node;
 121         while (*p) {
 122                 parent = *p;
 123                 frag = rb_entry(parent, struct ceph_inode_frag, node);
 124                 c = ceph_frag_compare(f, frag->frag);
 125                 if (c < 0)
 126                         p = &(*p)->rb_left;
 127                 else if (c > 0)
 128                         p = &(*p)->rb_right;
 129                 else
 130                         return frag;
 131         }
 132
 133         frag = kmalloc(sizeof(*frag), GFP_NOFS);
 134         if (!frag) {
 135                 pr_err("__get_or_create_frag ENOMEM on %p %llx.%llx "
 136                        "frag %x\n", &ci->vfs_inode,
 137                        ceph_vinop(&ci->vfs_inode), f);
 138                 return ERR_PTR(-ENOMEM);
 139         }
 140         frag->frag = f;
 141         frag->split_by = 0;
 142         frag->mds = -1;
 143         frag->ndist = 0;
 144
 145         rb_link_node(&frag->node, parent, p);
 146         rb_insert_color(&frag->node, &ci->i_fragtree);
 147
 148         dout("get_or_create_frag added %llx.%llx frag %x\n",
 149              ceph_vinop(&ci->vfs_inode), f);
 150         return frag;
 151 }
 152
 153 /*
 154  * find a specific frag @f
 155  */
 156 struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci, u32 f)
 157 {
 158         struct rb_node *n = ci->i_fragtree.rb_node;
 159
 160         while (n) {
 161                 struct ceph_inode_frag *frag =
 162                         rb_entry(n, struct ceph_inode_frag, node);
 163                 int c = ceph_frag_compare(f, frag->frag);
 164                 if (c < 0)
 165                         n = n->rb_left;
 166                 else if (c > 0)
 167                         n = n->rb_right;
 168                 else
 169                         return frag;
 170         }
 171         return NULL;
 172 }
 173
 174 /*
 175  * Choose frag containing the given value @v.  If @pfrag is
 176  * specified, copy the frag delegation info to the caller if
 177  * it is present.
 178  */
 179 u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
 180                      struct ceph_inode_frag *pfrag,
 181                      int *found)
 182 {
 183         u32 t = ceph_frag_make(0, 0);
 184         struct ceph_inode_frag *frag;
 185         unsigned nway, i;
 186         u32 n;
 187
 188         if (found)
 189                 *found = 0;
 190
 191         mutex_lock(&ci->i_fragtree_mutex);
 192         while (1) {
 193                 WARN_ON(!ceph_frag_contains_value(t, v));
 194                 frag = __ceph_find_frag(ci, t);
 195                 if (!frag)
 196                         break; /* t is a leaf */
 197                 if (frag->split_by == 0) {
 198                         if (pfrag)
 199                                 memcpy(pfrag, frag, sizeof(*pfrag));
 200                         if (found)
 201                                 *found = 1;
 202                         break;
 203                 }
 204
 205                 /* choose child */
 206                 nway = 1 << frag->split_by;
 207                 dout("choose_frag(%x) %x splits by %d (%d ways)\n", v, t,
 208                      frag->split_by, nway);
 209                 for (i = 0; i < nway; i++) {
 210                         n = ceph_frag_make_child(t, frag->split_by, i);
 211                         if (ceph_frag_contains_value(n, v)) {
 212                                 t = n;
 213                                 break;
 214                         }
 215                 }
 216                 BUG_ON(i == nway);
 217         }
 218         dout("choose_frag(%x) = %x\n", v, t);
 219
 220         mutex_unlock(&ci->i_fragtree_mutex);
 221         return t;
 222 }
 223
 224 /*
 225  * Process dirfrag (delegation) info from the mds.  Include leaf
 226  * fragment in tree ONLY if ndist > 0.  Otherwise, only
 227  * branches/splits are included in i_fragtree)
 228  */
 229 static int ceph_fill_dirfrag(struct inode *inode,
 230                              struct ceph_mds_reply_dirfrag *dirinfo)
 231 {
 232         struct ceph_inode_info *ci = ceph_inode(inode);
 233         struct ceph_inode_frag *frag;
 234         u32 id = le32_to_cpu(dirinfo->frag);
 235         int mds = le32_to_cpu(dirinfo->auth);
 236         int ndist = le32_to_cpu(dirinfo->ndist);
 237         int i;
 238         int err = 0;
 239
 240         mutex_lock(&ci->i_fragtree_mutex);
 241         if (ndist == 0) {
 242                 /* no delegation info needed. */
 243                 frag = __ceph_find_frag(ci, id);
 244                 if (!frag)
 245                         goto out;
 246                 if (frag->split_by == 0) {
 247                         /* tree leaf, remove */
 248                         dout("fill_dirfrag removed %llx.%llx frag %x"
 249                              " (no ref)\n", ceph_vinop(inode), id);
 250                         rb_erase(&frag->node, &ci->i_fragtree);
 251                         kfree(frag);
 252                 } else {
 253                         /* tree branch, keep and clear */
 254                         dout("fill_dirfrag cleared %llx.%llx frag %x"
 255                              " referral\n", ceph_vinop(inode), id);
 256                         frag->mds = -1;
 257                         frag->ndist = 0;
 258                 }
 259                 goto out;
 260         }
 261
 262
 263         /* find/add this frag to store mds delegation info */
 264         frag = __get_or_create_frag(ci, id);
 265         if (IS_ERR(frag)) {
 266                 /* this is not the end of the world; we can continue
 267                    with bad/inaccurate delegation info */
 268                 pr_err("fill_dirfrag ENOMEM on mds ref %llx.%llx fg %x\n",
 269                        ceph_vinop(inode), le32_to_cpu(dirinfo->frag));
 270                 err = -ENOMEM;
 271                 goto out;
 272         }
 273
 274         frag->mds = mds;
 275         frag->ndist = min_t(u32, ndist, CEPH_MAX_DIRFRAG_REP);
 276         for (i = 0; i < frag->ndist; i++)
 277                 frag->dist[i] = le32_to_cpu(dirinfo->dist[i]);
 278         dout("fill_dirfrag %llx.%llx frag %x ndist=%d\n",
 279              ceph_vinop(inode), frag->frag, frag->ndist);
 280
 281 out:
 282         mutex_unlock(&ci->i_fragtree_mutex);
 283         return err;
 284 }
 285
 286
 287 /*
 288  * initialize a newly allocated inode.
 289  */
 290 struct inode *ceph_alloc_inode(struct super_block *sb)
 291 {
 292         struct ceph_inode_info *ci;
 293         int i;
 294
 295         ci = kmem_cache_alloc(ceph_inode_cachep, GFP_NOFS);
 296         if (!ci)
 297                 return NULL;
 298
 299         dout("alloc_inode %p\n", &ci->vfs_inode);
 300
 301         spin_lock_init(&ci->i_ceph_lock);
 302
 303         ci->i_version = 0;
 304         ci->i_time_warp_seq = 0;
 305         ci->i_ceph_flags = 0;
 306         atomic_set(&ci->i_release_count, 1);
 307         atomic_set(&ci->i_complete_count, 0);
 308         ci->i_symlink = NULL;
 309
 310         memset(&ci->i_dir_layout, 0, sizeof(ci->i_dir_layout));
 311
 312         ci->i_fragtree = RB_ROOT;
 313         mutex_init(&ci->i_fragtree_mutex);
 314
 315         ci->i_xattrs.blob = NULL;
 316         ci->i_xattrs.prealloc_blob = NULL;
 317         ci->i_xattrs.dirty = false;
 318         ci->i_xattrs.index = RB_ROOT;
 319         ci->i_xattrs.count = 0;
 320         ci->i_xattrs.names_size = 0;
 321         ci->i_xattrs.vals_size = 0;
 322         ci->i_xattrs.version = 0;
 323         ci->i_xattrs.index_version = 0;
 324
 325         ci->i_caps = RB_ROOT;
 326         ci->i_auth_cap = NULL;
 327         ci->i_dirty_caps = 0;
 328         ci->i_flushing_caps = 0;
 329         INIT_LIST_HEAD(&ci->i_dirty_item);
 330         INIT_LIST_HEAD(&ci->i_flushing_item);
 331         ci->i_cap_flush_seq = 0;
 332         ci->i_cap_flush_last_tid = 0;
 333         memset(&ci->i_cap_flush_tid, 0, sizeof(ci->i_cap_flush_tid));
 334         init_waitqueue_head(&ci->i_cap_wq);
 335         ci->i_hold_caps_min = 0;
 336         ci->i_hold_caps_max = 0;
 337         INIT_LIST_HEAD(&ci->i_cap_delay_list);
 338         ci->i_cap_exporting_mds = 0;
 339         ci->i_cap_exporting_mseq = 0;
 340         ci->i_cap_exporting_issued = 0;
 341         INIT_LIST_HEAD(&ci->i_cap_snaps);
 342         ci->i_head_snapc = NULL;
 343         ci->i_snap_caps = 0;
 344
 345         for (i = 0; i < CEPH_FILE_MODE_NUM; i++)
 346                 ci->i_nr_by_mode[i] = 0;
 347
 348         mutex_init(&ci->i_truncate_mutex);
 349         ci->i_truncate_seq = 0;
 350         ci->i_truncate_size = 0;
 351         ci->i_truncate_pending = 0;
 352
 353         ci->i_max_size = 0;
 354         ci->i_reported_size = 0;
 355         ci->i_wanted_max_size = 0;
 356         ci->i_requested_max_size = 0;
 357
 358         ci->i_pin_ref = 0;
 359         ci->i_rd_ref = 0;
 360         ci->i_rdcache_ref = 0;
 361         ci->i_wr_ref = 0;
 362         ci->i_wb_ref = 0;
 363         ci->i_wrbuffer_ref = 0;
 364         ci->i_wrbuffer_ref_head = 0;
 365         ci->i_shared_gen = 0;
 366         ci->i_rdcache_gen = 0;
 367         ci->i_rdcache_revoking = 0;
 368
 369         INIT_LIST_HEAD(&ci->i_unsafe_writes);
 370         INIT_LIST_HEAD(&ci->i_unsafe_dirops);
 371         spin_lock_init(&ci->i_unsafe_lock);
 372
 373         ci->i_snap_realm = NULL;
 374         INIT_LIST_HEAD(&ci->i_snap_realm_item);
 375         INIT_LIST_HEAD(&ci->i_snap_flush_item);
 376
 377         INIT_WORK(&ci->i_wb_work, ceph_writeback_work);
 378         INIT_WORK(&ci->i_pg_inv_work, ceph_invalidate_work);
 379
 380         INIT_WORK(&ci->i_vmtruncate_work, ceph_vmtruncate_work);
 381
 382         ceph_fscache_inode_init(ci);
 383
 384         return &ci->vfs_inode;
 385 }
 386
 387 static void ceph_i_callback(struct rcu_head *head)
 388 {
 389         struct inode *inode = container_of(head, struct inode, i_rcu);
 390         struct ceph_inode_info *ci = ceph_inode(inode);
 391
 392         kmem_cache_free(ceph_inode_cachep, ci);
 393 }
 394
 395 void ceph_destroy_inode(struct inode *inode)
 396 {
 397         struct ceph_inode_info *ci = ceph_inode(inode);
 398         struct ceph_inode_frag *frag;
 399         struct rb_node *n;
 400
 401         dout("destroy_inode %p ino %llx.%llx\n", inode, ceph_vinop(inode));
 402
 403         ceph_fscache_unregister_inode_cookie(ci);
 404
 405         ceph_queue_caps_release(inode);
 406
 407         /*
 408          * we may still have a snap_realm reference if there are stray
 409          * caps in i_cap_exporting_issued or i_snap_caps.
 410          */
 411         if (ci->i_snap_realm) {
 412                 struct ceph_mds_client *mdsc =
 413                         ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc;
 414                 struct ceph_snap_realm *realm = ci->i_snap_realm;
 415
 416                 dout(" dropping residual ref to snap realm %p\n", realm);
 417                 spin_lock(&realm->inodes_with_caps_lock);
 418                 list_del_init(&ci->i_snap_realm_item);
 419                 spin_unlock(&realm->inodes_with_caps_lock);
 420                 ceph_put_snap_realm(mdsc, realm);
 421         }
 422
 423         kfree(ci->i_symlink);
 424         while ((n = rb_first(&ci->i_fragtree)) != NULL) {
 425                 frag = rb_entry(n, struct ceph_inode_frag, node);
 426                 rb_erase(n, &ci->i_fragtree);
 427                 kfree(frag);
 428         }
 429
 430         __ceph_destroy_xattrs(ci);
 431         if (ci->i_xattrs.blob)
 432                 ceph_buffer_put(ci->i_xattrs.blob);
 433         if (ci->i_xattrs.prealloc_blob)
 434                 ceph_buffer_put(ci->i_xattrs.prealloc_blob);
 435
 436         call_rcu(&inode->i_rcu, ceph_i_callback);
 437 }
 438
 439 int ceph_drop_inode(struct inode *inode)
 440 {
 441         /*
 442          * Positve dentry and corresponding inode are always accompanied
 443          * in MDS reply. So no need to keep inode in the cache after
 444          * dropping all its aliases.
 445          */
 446         return 1;
 447 }
 448
 449 /*
 450  * Helpers to fill in size, ctime, mtime, and atime.  We have to be
 451  * careful because either the client or MDS may have more up to date
 452  * info, depending on which capabilities are held, and whether
 453  * time_warp_seq or truncate_seq have increased.  (Ordinarily, mtime
 454  * and size are monotonically increasing, except when utimes() or
 455  * truncate() increments the corresponding _seq values.)
 456  */
 457 int ceph_fill_file_size(struct inode *inode, int issued,
 458                         u32 truncate_seq, u64 truncate_size, u64 size)
 459 {
 460         struct ceph_inode_info *ci = ceph_inode(inode);
 461         int queue_trunc = 0;
 462
 463         if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) > 0 ||
 464             (truncate_seq == ci->i_truncate_seq && size > inode->i_size)) {
 465                 dout("size %lld -> %llu\n", inode->i_size, size);
 466                 inode->i_size = size;
 467                 inode->i_blocks = (size + (1<<9) - 1) >> 9;
 468                 ci->i_reported_size = size;
 469                 if (truncate_seq != ci->i_truncate_seq) {
 470                         dout("truncate_seq %u -> %u\n",
 471                              ci->i_truncate_seq, truncate_seq);
 472                         ci->i_truncate_seq = truncate_seq;
 473
 474                         /* the MDS should have revoked these caps */
 475                         WARN_ON_ONCE(issued & (CEPH_CAP_FILE_EXCL |
 476                                                CEPH_CAP_FILE_RD |
 477                                                CEPH_CAP_FILE_WR |
 478                                                CEPH_CAP_FILE_LAZYIO));
 479                         /*
 480                          * If we hold relevant caps, or in the case where we're
 481                          * not the only client referencing this file and we
 482                          * don't hold those caps, then we need to check whether
 483                          * the file is either opened or mmaped
 484                          */
 485                         if ((issued & (CEPH_CAP_FILE_CACHE|
 486                                        CEPH_CAP_FILE_BUFFER)) ||
 487                             mapping_mapped(inode->i_mapping) ||
 488                             __ceph_caps_file_wanted(ci)) {
 489                                 ci->i_truncate_pending++;
 490                                 queue_trunc = 1;
 491                         }
 492                 }
 493         }
 494         if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) >= 0 &&
 495             ci->i_truncate_size != truncate_size) {
 496                 dout("truncate_size %lld -> %llu\n", ci->i_truncate_size,
 497                      truncate_size);
 498                 ci->i_truncate_size = truncate_size;
 499         }
 500
 501         if (queue_trunc)
 502                 ceph_fscache_invalidate(inode);
 503
 504         return queue_trunc;
 505 }
 506
 507 void ceph_fill_file_time(struct inode *inode, int issued,
 508                          u64 time_warp_seq, struct timespec *ctime,
 509                          struct timespec *mtime, struct timespec *atime)
 510 {
 511         struct ceph_inode_info *ci = ceph_inode(inode);
 512         int warn = 0;
 513
 514         if (issued & (CEPH_CAP_FILE_EXCL|
 515                       CEPH_CAP_FILE_WR|
 516                       CEPH_CAP_FILE_BUFFER|
 517                       CEPH_CAP_AUTH_EXCL|
 518                       CEPH_CAP_XATTR_EXCL)) {
 519                 if (timespec_compare(ctime, &inode->i_ctime) > 0) {
 520                         dout("ctime %ld.%09ld -> %ld.%09ld inc w/ cap\n",
 521                              inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
 522                              ctime->tv_sec, ctime->tv_nsec);
 523                         inode->i_ctime = *ctime;
 524                 }
 525                 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) > 0) {
 526                         /* the MDS did a utimes() */
 527                         dout("mtime %ld.%09ld -> %ld.%09ld "
 528                              "tw %d -> %d\n",
 529                              inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
 530                              mtime->tv_sec, mtime->tv_nsec,
 531                              ci->i_time_warp_seq, (int)time_warp_seq);
 532
 533                         inode->i_mtime = *mtime;
 534                         inode->i_atime = *atime;
 535                         ci->i_time_warp_seq = time_warp_seq;
 536                 } else if (time_warp_seq == ci->i_time_warp_seq) {
 537                         /* nobody did utimes(); take the max */
 538                         if (timespec_compare(mtime, &inode->i_mtime) > 0) {
 539                                 dout("mtime %ld.%09ld -> %ld.%09ld inc\n",
 540                                      inode->i_mtime.tv_sec,
 541                                      inode->i_mtime.tv_nsec,
 542                                      mtime->tv_sec, mtime->tv_nsec);
 543                                 inode->i_mtime = *mtime;
 544                         }
 545                         if (timespec_compare(atime, &inode->i_atime) > 0) {
 546                                 dout("atime %ld.%09ld -> %ld.%09ld inc\n",
 547                                      inode->i_atime.tv_sec,
 548                                      inode->i_atime.tv_nsec,
 549                                      atime->tv_sec, atime->tv_nsec);
 550                                 inode->i_atime = *atime;
 551                         }
 552                 } else if (issued & CEPH_CAP_FILE_EXCL) {
 553                         /* we did a utimes(); ignore mds values */
 554                 } else {
 555                         warn = 1;
 556                 }
 557         } else {
 558                 /* we have no write|excl caps; whatever the MDS says is true */
 559                 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) >= 0) {
 560                         inode->i_ctime = *ctime;
 561                         inode->i_mtime = *mtime;
 562                         inode->i_atime = *atime;
 563                         ci->i_time_warp_seq = time_warp_seq;
 564                 } else {
 565                         warn = 1;
 566                 }
 567         }
 568         if (warn) /* time_warp_seq shouldn't go backwards */
 569                 dout("%p mds time_warp_seq %llu < %u\n",
 570                      inode, time_warp_seq, ci->i_time_warp_seq);
 571 }
 572
 573 /*
 574  * Populate an inode based on info from mds.  May be called on new or
 575  * existing inodes.
 576  */
 577 static int fill_inode(struct inode *inode,
 578                       struct ceph_mds_reply_info_in *iinfo,
 579                       struct ceph_mds_reply_dirfrag *dirinfo,
 580                       struct ceph_mds_session *session,
 581                       unsigned long ttl_from, int cap_fmode,
 582                       struct ceph_cap_reservation *caps_reservation)
 583 {
 584         struct ceph_mds_reply_inode *info = iinfo->in;
 585         struct ceph_inode_info *ci = ceph_inode(inode);
 586         int i;
 587         int issued = 0, implemented;
 588         struct timespec mtime, atime, ctime;
 589         u32 nsplits;
 590         struct ceph_inode_frag *frag;
 591         struct rb_node *rb_node;
 592         struct ceph_buffer *xattr_blob = NULL;
 593         int err = 0;
 594         int queue_trunc = 0;
 595
 596         dout("fill_inode %p ino %llx.%llx v %llu had %llu\n",
 597              inode, ceph_vinop(inode), le64_to_cpu(info->version),
 598              ci->i_version);
 599
 600         /*
 601          * prealloc xattr data, if it looks like we'll need it.  only
 602          * if len > 4 (meaning there are actually xattrs; the first 4
 603          * bytes are the xattr count).
 604          */
 605         if (iinfo->xattr_len > 4) {
 606                 xattr_blob = ceph_buffer_new(iinfo->xattr_len, GFP_NOFS);
 607                 if (!xattr_blob)
 608                         pr_err("fill_inode ENOMEM xattr blob %d bytes\n",
 609                                iinfo->xattr_len);
 610         }
 611
 612         spin_lock(&ci->i_ceph_lock);
 613
 614         /*
 615          * provided version will be odd if inode value is projected,
 616          * even if stable.  skip the update if we have newer stable
 617          * info (ours>=theirs, e.g. due to racing mds replies), unless
 618          * we are getting projected (unstable) info (in which case the
 619          * version is odd, and we want ours>theirs).
 620          *   us   them
 621          *   2    2     skip
 622          *   3    2     skip
 623          *   3    3     update
 624          */
 625         if (le64_to_cpu(info->version) > 0 &&
 626             (ci->i_version & ~1) >= le64_to_cpu(info->version))
 627                 goto no_change;
 628
 629         issued = __ceph_caps_issued(ci, &implemented);
 630         issued |= implemented | __ceph_caps_dirty(ci);
 631
 632         /* update inode */
 633         ci->i_version = le64_to_cpu(info->version);
 634         inode->i_version++;
 635         inode->i_rdev = le32_to_cpu(info->rdev);
 636
 637         if ((issued & CEPH_CAP_AUTH_EXCL) == 0) {
 638                 inode->i_mode = le32_to_cpu(info->mode);
 639                 inode->i_uid = make_kuid(&init_user_ns, le32_to_cpu(info->uid));
 640                 inode->i_gid = make_kgid(&init_user_ns, le32_to_cpu(info->gid));
 641                 dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode,
 642                      from_kuid(&init_user_ns, inode->i_uid),
 643                      from_kgid(&init_user_ns, inode->i_gid));
 644         }
 645
 646         if ((issued & CEPH_CAP_LINK_EXCL) == 0)
 647                 set_nlink(inode, le32_to_cpu(info->nlink));
 648
 649         /* be careful with mtime, atime, size */
 650         ceph_decode_timespec(&atime, &info->atime);
 651         ceph_decode_timespec(&mtime, &info->mtime);
 652         ceph_decode_timespec(&ctime, &info->ctime);
 653         queue_trunc = ceph_fill_file_size(inode, issued,
 654                                           le32_to_cpu(info->truncate_seq),
 655                                           le64_to_cpu(info->truncate_size),
 656                                           le64_to_cpu(info->size));
 657         ceph_fill_file_time(inode, issued,
 658                             le32_to_cpu(info->time_warp_seq),
 659                             &ctime, &mtime, &atime);
 660
 661         /* only update max_size on auth cap */
 662         if ((info->cap.flags & CEPH_CAP_FLAG_AUTH) &&
 663             ci->i_max_size != le64_to_cpu(info->max_size)) {
 664                 dout("max_size %lld -> %llu\n", ci->i_max_size,
 665                      le64_to_cpu(info->max_size));
 666                 ci->i_max_size = le64_to_cpu(info->max_size);
 667         }
 668
 669         ci->i_layout = info->layout;
 670         inode->i_blkbits = fls(le32_to_cpu(info->layout.fl_stripe_unit)) - 1;
 671
 672         /* xattrs */
 673         /* note that if i_xattrs.len <= 4, i_xattrs.data will still be NULL. */
 674         if ((issued & CEPH_CAP_XATTR_EXCL) == 0 &&
 675             le64_to_cpu(info->xattr_version) > ci->i_xattrs.version) {
 676                 if (ci->i_xattrs.blob)
 677                         ceph_buffer_put(ci->i_xattrs.blob);
 678                 ci->i_xattrs.blob = xattr_blob;
 679                 if (xattr_blob)
 680                         memcpy(ci->i_xattrs.blob->vec.iov_base,
 681                                iinfo->xattr_data, iinfo->xattr_len);
 682                 ci->i_xattrs.version = le64_to_cpu(info->xattr_version);
 683                 xattr_blob = NULL;
 684         }
 685
 686         inode->i_mapping->a_ops = &ceph_aops;
 687         inode->i_mapping->backing_dev_info =
 688                 &ceph_sb_to_client(inode->i_sb)->backing_dev_info;
 689
 690         switch (inode->i_mode & S_IFMT) {
 691         case S_IFIFO:
 692         case S_IFBLK:
 693         case S_IFCHR:
 694         case S_IFSOCK:
 695                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
 696                 inode->i_op = &ceph_file_iops;
 697                 break;
 698         case S_IFREG:
 699                 inode->i_op = &ceph_file_iops;
 700                 inode->i_fop = &ceph_file_fops;
 701                 break;
 702         case S_IFLNK:
 703                 inode->i_op = &ceph_symlink_iops;
 704                 if (!ci->i_symlink) {
 705                         u32 symlen = iinfo->symlink_len;
 706                         char *sym;
 707
 708                         spin_unlock(&ci->i_ceph_lock);
 709
 710                         err = -EINVAL;
 711                         if (WARN_ON(symlen != inode->i_size))
 712                                 goto out;
 713
 714                         err = -ENOMEM;
 715                         sym = kstrndup(iinfo->symlink, symlen, GFP_NOFS);
 716                         if (!sym)
 717                                 goto out;
 718
 719                         spin_lock(&ci->i_ceph_lock);
 720                         if (!ci->i_symlink)
 721                                 ci->i_symlink = sym;
 722                         else
 723                                 kfree(sym); /* lost a race */
 724                 }
 725                 break;
 726         case S_IFDIR:
 727                 inode->i_op = &ceph_dir_iops;
 728                 inode->i_fop = &ceph_dir_fops;
 729
 730                 ci->i_dir_layout = iinfo->dir_layout;
 731
 732                 ci->i_files = le64_to_cpu(info->files);
 733                 ci->i_subdirs = le64_to_cpu(info->subdirs);
 734                 ci->i_rbytes = le64_to_cpu(info->rbytes);
 735                 ci->i_rfiles = le64_to_cpu(info->rfiles);
 736                 ci->i_rsubdirs = le64_to_cpu(info->rsubdirs);
 737                 ceph_decode_timespec(&ci->i_rctime, &info->rctime);
 738                 break;
 739         default:
 740                 pr_err("fill_inode %llx.%llx BAD mode 0%o\n",
 741                        ceph_vinop(inode), inode->i_mode);
 742         }
 743
 744         /* set dir completion flag? */
 745         if (S_ISDIR(inode->i_mode) &&
 746             ci->i_files == 0 && ci->i_subdirs == 0 &&
 747             ceph_snap(inode) == CEPH_NOSNAP &&
 748             (le32_to_cpu(info->cap.caps) & CEPH_CAP_FILE_SHARED) &&
 749             (issued & CEPH_CAP_FILE_EXCL) == 0 &&
 750             !__ceph_dir_is_complete(ci)) {
 751                 dout(" marking %p complete (empty)\n", inode);
 752                 __ceph_dir_set_complete(ci, atomic_read(&ci->i_release_count));
 753                 ci->i_max_offset = 2;
 754         }
 755 no_change:
 756         spin_unlock(&ci->i_ceph_lock);
 757
 758         /* queue truncate if we saw i_size decrease */
 759         if (queue_trunc)
 760                 ceph_queue_vmtruncate(inode);
 761
 762         /* populate frag tree */
 763         /* FIXME: move me up, if/when version reflects fragtree changes */
 764         nsplits = le32_to_cpu(info->fragtree.nsplits);
 765         mutex_lock(&ci->i_fragtree_mutex);
 766         rb_node = rb_first(&ci->i_fragtree);
 767         for (i = 0; i < nsplits; i++) {
 768                 u32 id = le32_to_cpu(info->fragtree.splits[i].frag);
 769                 frag = NULL;
 770                 while (rb_node) {
 771                         frag = rb_entry(rb_node, struct ceph_inode_frag, node);
 772                         if (ceph_frag_compare(frag->frag, id) >= 0) {
 773                                 if (frag->frag != id)
 774                                         frag = NULL;
 775                                 else
 776                                         rb_node = rb_next(rb_node);
 777                                 break;
 778                         }
 779                         rb_node = rb_next(rb_node);
 780                         rb_erase(&frag->node, &ci->i_fragtree);
 781                         kfree(frag);
 782                         frag = NULL;
 783                 }
 784                 if (!frag) {
 785                         frag = __get_or_create_frag(ci, id);
 786                         if (IS_ERR(frag))
 787                                 continue;
 788                 }
 789                 frag->split_by = le32_to_cpu(info->fragtree.splits[i].by);
 790                 dout(" frag %x split by %d\n", frag->frag, frag->split_by);
 791         }
 792         while (rb_node) {
 793                 frag = rb_entry(rb_node, struct ceph_inode_frag, node);
 794                 rb_node = rb_next(rb_node);
 795                 rb_erase(&frag->node, &ci->i_fragtree);
 796                 kfree(frag);
 797         }
 798         mutex_unlock(&ci->i_fragtree_mutex);
 799
 800         /* were we issued a capability? */
 801         if (info->cap.caps) {
 802                 if (ceph_snap(inode) == CEPH_NOSNAP) {
 803                         ceph_add_cap(inode, session,
 804                                      le64_to_cpu(info->cap.cap_id),
 805                                      cap_fmode,
 806                                      le32_to_cpu(info->cap.caps),
 807                                      le32_to_cpu(info->cap.wanted),
 808                                      le32_to_cpu(info->cap.seq),
 809                                      le32_to_cpu(info->cap.mseq),
 810                                      le64_to_cpu(info->cap.realm),
 811                                      info->cap.flags,
 812                                      caps_reservation);
 813                 } else {
 814                         spin_lock(&ci->i_ceph_lock);
 815                         dout(" %p got snap_caps %s\n", inode,
 816                              ceph_cap_string(le32_to_cpu(info->cap.caps)));
 817                         ci->i_snap_caps |= le32_to_cpu(info->cap.caps);
 818                         if (cap_fmode >= 0)
 819                                 __ceph_get_fmode(ci, cap_fmode);
 820                         spin_unlock(&ci->i_ceph_lock);
 821                 }
 822         } else if (cap_fmode >= 0) {
 823                 pr_warning("mds issued no caps on %llx.%llx\n",
 824                            ceph_vinop(inode));
 825                 __ceph_get_fmode(ci, cap_fmode);
 826         }
 827
 828         /* update delegation info? */
 829         if (dirinfo)
 830                 ceph_fill_dirfrag(inode, dirinfo);
 831
 832         err = 0;
 833
 834 out:
 835         if (xattr_blob)
 836                 ceph_buffer_put(xattr_blob);
 837         return err;
 838 }
 839
 840 /*
 841  * caller should hold session s_mutex.
 842  */
 843 static void update_dentry_lease(struct dentry *dentry,
 844                                 struct ceph_mds_reply_lease *lease,
 845                                 struct ceph_mds_session *session,
 846                                 unsigned long from_time)
 847 {
 848         struct ceph_dentry_info *di = ceph_dentry(dentry);
 849         long unsigned duration = le32_to_cpu(lease->duration_ms);
 850         long unsigned ttl = from_time + (duration * HZ) / 1000;
 851         long unsigned half_ttl = from_time + (duration * HZ / 2) / 1000;
 852         struct inode *dir;
 853
 854         /* only track leases on regular dentries */
 855         if (dentry->d_op != &ceph_dentry_ops)
 856                 return;
 857
 858         spin_lock(&dentry->d_lock);
 859         dout("update_dentry_lease %p duration %lu ms ttl %lu\n",
 860              dentry, duration, ttl);
 861
 862         /* make lease_rdcache_gen match directory */
 863         dir = dentry->d_parent->d_inode;
 864         di->lease_shared_gen = ceph_inode(dir)->i_shared_gen;
 865
 866         if (duration == 0)
 867                 goto out_unlock;
 868
 869         if (di->lease_gen == session->s_cap_gen &&
 870             time_before(ttl, dentry->d_time))
 871                 goto out_unlock;  /* we already have a newer lease. */
 872
 873         if (di->lease_session && di->lease_session != session)
 874                 goto out_unlock;
 875
 876         ceph_dentry_lru_touch(dentry);
 877
 878         if (!di->lease_session)
 879                 di->lease_session = ceph_get_mds_session(session);
 880         di->lease_gen = session->s_cap_gen;
 881         di->lease_seq = le32_to_cpu(lease->seq);
 882         di->lease_renew_after = half_ttl;
 883         di->lease_renew_from = 0;
 884         dentry->d_time = ttl;
 885 out_unlock:
 886         spin_unlock(&dentry->d_lock);
 887         return;
 888 }
 889
 890 /*
 891  * Set dentry's directory position based on the current dir's max, and
 892  * order it in d_subdirs, so that dcache_readdir behaves.
 893  *
 894  * Always called under directory's i_mutex.
 895  */
 896 static void ceph_set_dentry_offset(struct dentry *dn)
 897 {
 898         struct dentry *dir = dn->d_parent;
 899         struct inode *inode = dir->d_inode;
 900         struct ceph_inode_info *ci;
 901         struct ceph_dentry_info *di;
 902
 903         BUG_ON(!inode);
 904
 905         ci = ceph_inode(inode);
 906         di = ceph_dentry(dn);
 907
 908         spin_lock(&ci->i_ceph_lock);
 909         if (!__ceph_dir_is_complete(ci)) {
 910                 spin_unlock(&ci->i_ceph_lock);
 911                 return;
 912         }
 913         di->offset = ceph_inode(inode)->i_max_offset++;
 914         spin_unlock(&ci->i_ceph_lock);
 915
 916         spin_lock(&dir->d_lock);
 917         spin_lock_nested(&dn->d_lock, DENTRY_D_LOCK_NESTED);
 918         list_move(&dn->d_u.d_child, &dir->d_subdirs);
 919         dout("set_dentry_offset %p %lld (%p %p)\n", dn, di->offset,
 920              dn->d_u.d_child.prev, dn->d_u.d_child.next);
 921         spin_unlock(&dn->d_lock);
 922         spin_unlock(&dir->d_lock);
 923 }
 924
 925 /*
 926  * splice a dentry to an inode.
 927  * caller must hold directory i_mutex for this to be safe.
 928  *
 929  * we will only rehash the resulting dentry if @prehash is
 930  * true; @prehash will be set to false (for the benefit of
 931  * the caller) if we fail.
 932  */
 933 static struct dentry *splice_dentry(struct dentry *dn, struct inode *in,
 934                                     bool *prehash, bool set_offset)
 935 {
 936         struct dentry *realdn;
 937
 938         BUG_ON(dn->d_inode);
 939
 940         /* dn must be unhashed */
 941         if (!d_unhashed(dn))
 942                 d_drop(dn);
 943         realdn = d_materialise_unique(dn, in);
 944         if (IS_ERR(realdn)) {
 945                 pr_err("splice_dentry error %ld %p inode %p ino %llx.%llx\n",
 946                        PTR_ERR(realdn), dn, in, ceph_vinop(in));
 947                 if (prehash)
 948                         *prehash = false; /* don't rehash on error */
 949                 dn = realdn; /* note realdn contains the error */
 950                 goto out;
 951         } else if (realdn) {
 952                 dout("dn %p (%d) spliced with %p (%d) "
 953                      "inode %p ino %llx.%llx\n",
 954                      dn, d_count(dn),
 955                      realdn, d_count(realdn),
 956                      realdn->d_inode, ceph_vinop(realdn->d_inode));
 957                 dput(dn);
 958                 dn = realdn;
 959         } else {
 960                 BUG_ON(!ceph_dentry(dn));
 961                 dout("dn %p attached to %p ino %llx.%llx\n",
 962                      dn, dn->d_inode, ceph_vinop(dn->d_inode));
 963         }
 964         if ((!prehash || *prehash) && d_unhashed(dn))
 965                 d_rehash(dn);
 966         if (set_offset)
 967                 ceph_set_dentry_offset(dn);
 968 out:
 969         return dn;
 970 }
 971
 972 /*
 973  * Incorporate results into the local cache.  This is either just
 974  * one inode, or a directory, dentry, and possibly linked-to inode (e.g.,
 975  * after a lookup).
 976  *
 977  * A reply may contain
 978  *         a directory inode along with a dentry.
 979  *  and/or a target inode
 980  *
 981  * Called with snap_rwsem (read).
 982  */
 983 int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req,
 984                     struct ceph_mds_session *session)
 985 {
 986         struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
 987         struct inode *in = NULL;
 988         struct ceph_mds_reply_inode *ininfo;
 989         struct ceph_vino vino;
 990         struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
 991         int i = 0;
 992         int err = 0;
 993
 994         dout("fill_trace %p is_dentry %d is_target %d\n", req,
 995              rinfo->head->is_dentry, rinfo->head->is_target);
 996
 997 #if 0
 998         /*
 999          * Debugging hook:
1000          *
1001          * If we resend completed ops to a recovering mds, we get no
1002          * trace.  Since that is very rare, pretend this is the case
1003          * to ensure the 'no trace' handlers in the callers behave.
1004          *
1005          * Fill in inodes unconditionally to avoid breaking cap
1006          * invariants.
1007          */
1008         if (rinfo->head->op & CEPH_MDS_OP_WRITE) {
1009                 pr_info("fill_trace faking empty trace on %lld %s\n",
1010                         req->r_tid, ceph_mds_op_name(rinfo->head->op));
1011                 if (rinfo->head->is_dentry) {
1012                         rinfo->head->is_dentry = 0;
1013                         err = fill_inode(req->r_locked_dir,
1014                                          &rinfo->diri, rinfo->dirfrag,
1015                                          session, req->r_request_started, -1);
1016                 }
1017                 if (rinfo->head->is_target) {
1018                         rinfo->head->is_target = 0;
1019                         ininfo = rinfo->targeti.in;
1020                         vino.ino = le64_to_cpu(ininfo->ino);
1021                         vino.snap = le64_to_cpu(ininfo->snapid);
1022                         in = ceph_get_inode(sb, vino);
1023                         err = fill_inode(in, &rinfo->targeti, NULL,
1024                                          session, req->r_request_started,
1025                                          req->r_fmode);
1026                         iput(in);
1027                 }
1028         }
1029 #endif
1030
1031         if (!rinfo->head->is_target && !rinfo->head->is_dentry) {
1032                 dout("fill_trace reply is empty!\n");
1033                 if (rinfo->head->result == 0 && req->r_locked_dir)
1034                         ceph_invalidate_dir_request(req);
1035                 return 0;
1036         }
1037
1038         if (rinfo->head->is_dentry) {
1039                 struct inode *dir = req->r_locked_dir;
1040
1041                 if (dir) {
1042                         err = fill_inode(dir, &rinfo->diri, rinfo->dirfrag,
1043                                          session, req->r_request_started, -1,
1044                                          &req->r_caps_reservation);
1045                         if (err < 0)
1046                                 return err;
1047                 } else {
1048                         WARN_ON_ONCE(1);
1049                 }
1050         }
1051
1052         /*
1053          * ignore null lease/binding on snapdir ENOENT, or else we
1054          * will have trouble splicing in the virtual snapdir later
1055          */
1056         if (rinfo->head->is_dentry && !req->r_aborted &&
1057             req->r_locked_dir &&
1058             (rinfo->head->is_target || strncmp(req->r_dentry->d_name.name,
1059                                                fsc->mount_options->snapdir_name,
1060                                                req->r_dentry->d_name.len))) {
1061                 /*
1062                  * lookup link rename   : null -> possibly existing inode
1063                  * mknod symlink mkdir  : null -> new inode
1064                  * unlink               : linked -> null
1065                  */
1066                 struct inode *dir = req->r_locked_dir;
1067                 struct dentry *dn = req->r_dentry;
1068                 bool have_dir_cap, have_lease;
1069
1070                 BUG_ON(!dn);
1071                 BUG_ON(!dir);
1072                 BUG_ON(dn->d_parent->d_inode != dir);
1073                 BUG_ON(ceph_ino(dir) !=
1074                        le64_to_cpu(rinfo->diri.in->ino));
1075                 BUG_ON(ceph_snap(dir) !=
1076                        le64_to_cpu(rinfo->diri.in->snapid));
1077
1078                 /* do we have a lease on the whole dir? */
1079                 have_dir_cap =
1080                         (le32_to_cpu(rinfo->diri.in->cap.caps) &
1081                          CEPH_CAP_FILE_SHARED);
1082
1083                 /* do we have a dn lease? */
1084                 have_lease = have_dir_cap ||
1085                         le32_to_cpu(rinfo->dlease->duration_ms);
1086                 if (!have_lease)
1087                         dout("fill_trace  no dentry lease or dir cap\n");
1088
1089                 /* rename? */
1090                 if (req->r_old_dentry && req->r_op == CEPH_MDS_OP_RENAME) {
1091                         dout(" src %p '%.*s' dst %p '%.*s'\n",
1092                              req->r_old_dentry,
1093                              req->r_old_dentry->d_name.len,
1094                              req->r_old_dentry->d_name.name,
1095                              dn, dn->d_name.len, dn->d_name.name);
1096                         dout("fill_trace doing d_move %p -> %p\n",
1097                              req->r_old_dentry, dn);
1098
1099                         d_move(req->r_old_dentry, dn);
1100                         dout(" src %p '%.*s' dst %p '%.*s'\n",
1101                              req->r_old_dentry,
1102                              req->r_old_dentry->d_name.len,
1103                              req->r_old_dentry->d_name.name,
1104                              dn, dn->d_name.len, dn->d_name.name);
1105
1106                         /* ensure target dentry is invalidated, despite
1107                            rehashing bug in vfs_rename_dir */
1108                         ceph_invalidate_dentry_lease(dn);
1109
1110                         /*
1111                          * d_move() puts the renamed dentry at the end of
1112                          * d_subdirs.  We need to assign it an appropriate
1113                          * directory offset so we can behave when dir is
1114                          * complete.
1115                          */
1116                         ceph_set_dentry_offset(req->r_old_dentry);
1117                         dout("dn %p gets new offset %lld\n", req->r_old_dentry,
1118                              ceph_dentry(req->r_old_dentry)->offset);
1119
1120                         dn = req->r_old_dentry;  /* use old_dentry */
1121                         in = dn->d_inode;
1122                 }
1123
1124                 /* null dentry? */
1125                 if (!rinfo->head->is_target) {
1126                         dout("fill_trace null dentry\n");
1127                         if (dn->d_inode) {
1128                                 dout("d_delete %p\n", dn);
1129                                 d_delete(dn);
1130                         } else {
1131                                 dout("d_instantiate %p NULL\n", dn);
1132                                 d_instantiate(dn, NULL);
1133                                 if (have_lease && d_unhashed(dn))
1134                                         d_rehash(dn);
1135                                 update_dentry_lease(dn, rinfo->dlease,
1136                                                     session,
1137                                                     req->r_request_started);
1138                         }
1139                         goto done;
1140                 }
1141
1142                 /* attach proper inode */
1143                 ininfo = rinfo->targeti.in;
1144                 vino.ino = le64_to_cpu(ininfo->ino);
1145                 vino.snap = le64_to_cpu(ininfo->snapid);
1146                 in = dn->d_inode;
1147                 if (!in) {
1148                         in = ceph_get_inode(sb, vino);
1149                         if (IS_ERR(in)) {
1150                                 pr_err("fill_trace bad get_inode "
1151                                        "%llx.%llx\n", vino.ino, vino.snap);
1152                                 err = PTR_ERR(in);
1153                                 d_drop(dn);
1154                                 goto done;
1155                         }
1156                         dn = splice_dentry(dn, in, &have_lease, true);
1157                         if (IS_ERR(dn)) {
1158                                 err = PTR_ERR(dn);
1159                                 goto done;
1160                         }
1161                         req->r_dentry = dn;  /* may have spliced */
1162                         ihold(in);
1163                 } else if (ceph_ino(in) == vino.ino &&
1164                            ceph_snap(in) == vino.snap) {
1165                         ihold(in);
1166                 } else {
1167                         dout(" %p links to %p %llx.%llx, not %llx.%llx\n",
1168                              dn, in, ceph_ino(in), ceph_snap(in),
1169                              vino.ino, vino.snap);
1170                         have_lease = false;
1171                         in = NULL;
1172                 }
1173
1174                 if (have_lease)
1175                         update_dentry_lease(dn, rinfo->dlease, session,
1176                                             req->r_request_started);
1177                 dout(" final dn %p\n", dn);
1178                 i++;
1179         } else if ((req->r_op == CEPH_MDS_OP_LOOKUPSNAP ||
1180                    req->r_op == CEPH_MDS_OP_MKSNAP) && !req->r_aborted) {
1181                 struct dentry *dn = req->r_dentry;
1182
1183                 /* fill out a snapdir LOOKUPSNAP dentry */
1184                 BUG_ON(!dn);
1185                 BUG_ON(!req->r_locked_dir);
1186                 BUG_ON(ceph_snap(req->r_locked_dir) != CEPH_SNAPDIR);
1187                 ininfo = rinfo->targeti.in;
1188                 vino.ino = le64_to_cpu(ininfo->ino);
1189                 vino.snap = le64_to_cpu(ininfo->snapid);
1190                 in = ceph_get_inode(sb, vino);
1191                 if (IS_ERR(in)) {
1192                         pr_err("fill_inode get_inode badness %llx.%llx\n",
1193                                vino.ino, vino.snap);
1194                         err = PTR_ERR(in);
1195                         d_delete(dn);
1196                         goto done;
1197                 }
1198                 dout(" linking snapped dir %p to dn %p\n", in, dn);
1199                 dn = splice_dentry(dn, in, NULL, true);
1200                 if (IS_ERR(dn)) {
1201                         err = PTR_ERR(dn);
1202                         goto done;
1203                 }
1204                 req->r_dentry = dn;  /* may have spliced */
1205                 ihold(in);
1206                 rinfo->head->is_dentry = 1;  /* fool notrace handlers */
1207         }
1208
1209         if (rinfo->head->is_target) {
1210                 vino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1211                 vino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1212
1213                 if (in == NULL || ceph_ino(in) != vino.ino ||
1214                     ceph_snap(in) != vino.snap) {
1215                         in = ceph_get_inode(sb, vino);
1216                         if (IS_ERR(in)) {
1217                                 err = PTR_ERR(in);
1218                                 goto done;
1219                         }
1220                 }
1221                 req->r_target_inode = in;
1222
1223                 err = fill_inode(in,
1224                                  &rinfo->targeti, NULL,
1225                                  session, req->r_request_started,
1226                                  (le32_to_cpu(rinfo->head->result) == 0) ?
1227                                  req->r_fmode : -1,
1228                                  &req->r_caps_reservation);
1229                 if (err < 0) {
1230                         pr_err("fill_inode badness %p %llx.%llx\n",
1231                                in, ceph_vinop(in));
1232                         goto done;
1233                 }
1234         }
1235
1236 done:
1237         dout("fill_trace done err=%d\n", err);
1238         return err;
1239 }
1240
1241 /*
1242  * Prepopulate our cache with readdir results, leases, etc.
1243  */
1244 static int readdir_prepopulate_inodes_only(struct ceph_mds_request *req,
1245                                            struct ceph_mds_session *session)
1246 {
1247         struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1248         int i, err = 0;
1249
1250         for (i = 0; i < rinfo->dir_nr; i++) {
1251                 struct ceph_vino vino;
1252                 struct inode *in;
1253                 int rc;
1254
1255                 vino.ino = le64_to_cpu(rinfo->dir_in[i].in->ino);
1256                 vino.snap = le64_to_cpu(rinfo->dir_in[i].in->snapid);
1257
1258                 in = ceph_get_inode(req->r_dentry->d_sb, vino);
1259                 if (IS_ERR(in)) {
1260                         err = PTR_ERR(in);
1261                         dout("new_inode badness got %d\n", err);
1262                         continue;
1263                 }
1264                 rc = fill_inode(in, &rinfo->dir_in[i], NULL, session,
1265                                 req->r_request_started, -1,
1266                                 &req->r_caps_reservation);
1267                 if (rc < 0) {
1268                         pr_err("fill_inode badness on %p got %d\n", in, rc);
1269                         err = rc;
1270                         continue;
1271                 }
1272         }
1273
1274         return err;
1275 }
1276
1277 int ceph_readdir_prepopulate(struct ceph_mds_request *req,
1278                              struct ceph_mds_session *session)
1279 {
1280         struct dentry *parent = req->r_dentry;
1281         struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1282         struct qstr dname;
1283         struct dentry *dn;
1284         struct inode *in;
1285         int err = 0, i;
1286         struct inode *snapdir = NULL;
1287         struct ceph_mds_request_head *rhead = req->r_request->front.iov_base;
1288         struct ceph_dentry_info *di;
1289         u64 r_readdir_offset = req->r_readdir_offset;
1290         u32 frag = le32_to_cpu(rhead->args.readdir.frag);
1291
1292         if (rinfo->dir_dir &&
1293             le32_to_cpu(rinfo->dir_dir->frag) != frag) {
1294                 dout("readdir_prepopulate got new frag %x -> %x\n",
1295                      frag, le32_to_cpu(rinfo->dir_dir->frag));
1296                 frag = le32_to_cpu(rinfo->dir_dir->frag);
1297                 if (ceph_frag_is_leftmost(frag))
1298                         r_readdir_offset = 2;
1299                 else
1300                         r_readdir_offset = 0;
1301         }
1302
1303         if (req->r_aborted)
1304                 return readdir_prepopulate_inodes_only(req, session);
1305
1306         if (le32_to_cpu(rinfo->head->op) == CEPH_MDS_OP_LSSNAP) {
1307                 snapdir = ceph_get_snapdir(parent->d_inode);
1308                 parent = d_find_alias(snapdir);
1309                 dout("readdir_prepopulate %d items under SNAPDIR dn %p\n",
1310                      rinfo->dir_nr, parent);
1311         } else {
1312                 dout("readdir_prepopulate %d items under dn %p\n",
1313                      rinfo->dir_nr, parent);
1314                 if (rinfo->dir_dir)
1315                         ceph_fill_dirfrag(parent->d_inode, rinfo->dir_dir);
1316         }
1317
1318         for (i = 0; i < rinfo->dir_nr; i++) {
1319                 struct ceph_vino vino;
1320
1321                 dname.name = rinfo->dir_dname[i];
1322                 dname.len = rinfo->dir_dname_len[i];
1323                 dname.hash = full_name_hash(dname.name, dname.len);
1324
1325                 vino.ino = le64_to_cpu(rinfo->dir_in[i].in->ino);
1326                 vino.snap = le64_to_cpu(rinfo->dir_in[i].in->snapid);
1327
1328 retry_lookup:
1329                 dn = d_lookup(parent, &dname);
1330                 dout("d_lookup on parent=%p name=%.*s got %p\n",
1331                      parent, dname.len, dname.name, dn);
1332
1333                 if (!dn) {
1334                         dn = d_alloc(parent, &dname);
1335                         dout("d_alloc %p '%.*s' = %p\n", parent,
1336                              dname.len, dname.name, dn);
1337                         if (dn == NULL) {
1338                                 dout("d_alloc badness\n");
1339                                 err = -ENOMEM;
1340                                 goto out;
1341                         }
1342                         err = ceph_init_dentry(dn);
1343                         if (err < 0) {
1344                                 dput(dn);
1345                                 goto out;
1346                         }
1347                 } else if (dn->d_inode &&
1348                            (ceph_ino(dn->d_inode) != vino.ino ||
1349                             ceph_snap(dn->d_inode) != vino.snap)) {
1350                         dout(" dn %p points to wrong inode %p\n",
1351                              dn, dn->d_inode);
1352                         d_delete(dn);
1353                         dput(dn);
1354                         goto retry_lookup;
1355                 } else {
1356                         /* reorder parent's d_subdirs */
1357                         spin_lock(&parent->d_lock);
1358                         spin_lock_nested(&dn->d_lock, DENTRY_D_LOCK_NESTED);
1359                         list_move(&dn->d_u.d_child, &parent->d_subdirs);
1360                         spin_unlock(&dn->d_lock);
1361                         spin_unlock(&parent->d_lock);
1362                 }
1363
1364                 di = dn->d_fsdata;
1365                 di->offset = ceph_make_fpos(frag, i + r_readdir_offset);
1366
1367                 /* inode */
1368                 if (dn->d_inode) {
1369                         in = dn->d_inode;
1370                 } else {
1371                         in = ceph_get_inode(parent->d_sb, vino);
1372                         if (IS_ERR(in)) {
1373                                 dout("new_inode badness\n");
1374                                 d_drop(dn);
1375                                 dput(dn);
1376                                 err = PTR_ERR(in);
1377                                 goto out;
1378                         }
1379                         dn = splice_dentry(dn, in, NULL, false);
1380                         if (IS_ERR(dn))
1381                                 dn = NULL;
1382                 }
1383
1384                 if (fill_inode(in, &rinfo->dir_in[i], NULL, session,
1385                                req->r_request_started, -1,
1386                                &req->r_caps_reservation) < 0) {
1387                         pr_err("fill_inode badness on %p\n", in);
1388                         goto next_item;
1389                 }
1390                 if (dn)
1391                         update_dentry_lease(dn, rinfo->dir_dlease[i],
1392                                             req->r_session,
1393                                             req->r_request_started);
1394 next_item:
1395                 if (dn)
1396                         dput(dn);
1397         }
1398         req->r_did_prepopulate = true;
1399
1400 out:
1401         if (snapdir) {
1402                 iput(snapdir);
1403                 dput(parent);
1404         }
1405         dout("readdir_prepopulate done\n");
1406         return err;
1407 }
1408
1409 int ceph_inode_set_size(struct inode *inode, loff_t size)
1410 {
1411         struct ceph_inode_info *ci = ceph_inode(inode);
1412         int ret = 0;
1413
1414         spin_lock(&ci->i_ceph_lock);
1415         dout("set_size %p %llu -> %llu\n", inode, inode->i_size, size);
1416         inode->i_size = size;
1417         inode->i_blocks = (size + (1 << 9) - 1) >> 9;
1418
1419         /* tell the MDS if we are approaching max_size */
1420         if ((size << 1) >= ci->i_max_size &&
1421             (ci->i_reported_size << 1) < ci->i_max_size)
1422                 ret = 1;
1423
1424         spin_unlock(&ci->i_ceph_lock);
1425         return ret;
1426 }
1427
1428 /*
1429  * Write back inode data in a worker thread.  (This can't be done
1430  * in the message handler context.)
1431  */
1432 void ceph_queue_writeback(struct inode *inode)
1433 {
1434         ihold(inode);
1435         if (queue_work(ceph_inode_to_client(inode)->wb_wq,
1436                        &ceph_inode(inode)->i_wb_work)) {
1437                 dout("ceph_queue_writeback %p\n", inode);
1438         } else {
1439                 dout("ceph_queue_writeback %p failed\n", inode);
1440                 iput(inode);
1441         }
1442 }
1443
1444 static void ceph_writeback_work(struct work_struct *work)
1445 {
1446         struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1447                                                   i_wb_work);
1448         struct inode *inode = &ci->vfs_inode;
1449
1450         dout("writeback %p\n", inode);
1451         filemap_fdatawrite(&inode->i_data);
1452         iput(inode);
1453 }
1454
1455 /*
1456  * queue an async invalidation
1457  */
1458 void ceph_queue_invalidate(struct inode *inode)
1459 {
1460         ihold(inode);
1461         if (queue_work(ceph_inode_to_client(inode)->pg_inv_wq,
1462                        &ceph_inode(inode)->i_pg_inv_work)) {
1463                 dout("ceph_queue_invalidate %p\n", inode);
1464         } else {
1465                 dout("ceph_queue_invalidate %p failed\n", inode);
1466                 iput(inode);
1467         }
1468 }
1469
1470 /*
1471  * Invalidate inode pages in a worker thread.  (This can't be done
1472  * in the message handler context.)
1473  */
1474 static void ceph_invalidate_work(struct work_struct *work)
1475 {
1476         struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1477                                                   i_pg_inv_work);
1478         struct inode *inode = &ci->vfs_inode;
1479         u32 orig_gen;
1480         int check = 0;
1481
1482         mutex_lock(&ci->i_truncate_mutex);
1483         spin_lock(&ci->i_ceph_lock);
1484         dout("invalidate_pages %p gen %d revoking %d\n", inode,
1485              ci->i_rdcache_gen, ci->i_rdcache_revoking);
1486         if (ci->i_rdcache_revoking != ci->i_rdcache_gen) {
1487                 /* nevermind! */
1488                 spin_unlock(&ci->i_ceph_lock);
1489                 mutex_unlock(&ci->i_truncate_mutex);
1490                 goto out;
1491         }
1492         orig_gen = ci->i_rdcache_gen;
1493         spin_unlock(&ci->i_ceph_lock);
1494
1495         truncate_inode_pages(inode->i_mapping, 0);
1496
1497         spin_lock(&ci->i_ceph_lock);
1498         if (orig_gen == ci->i_rdcache_gen &&
1499             orig_gen == ci->i_rdcache_revoking) {
1500                 dout("invalidate_pages %p gen %d successful\n", inode,
1501                      ci->i_rdcache_gen);
1502                 ci->i_rdcache_revoking--;
1503                 check = 1;
1504         } else {
1505                 dout("invalidate_pages %p gen %d raced, now %d revoking %d\n",
1506                      inode, orig_gen, ci->i_rdcache_gen,
1507                      ci->i_rdcache_revoking);
1508         }
1509         spin_unlock(&ci->i_ceph_lock);
1510         mutex_unlock(&ci->i_truncate_mutex);
1511
1512         if (check)
1513                 ceph_check_caps(ci, 0, NULL);
1514 out:
1515         iput(inode);
1516 }
1517
1518
1519 /*
1520  * called by trunc_wq;
1521  *
1522  * We also truncate in a separate thread as well.
1523  */
1524 static void ceph_vmtruncate_work(struct work_struct *work)
1525 {
1526         struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1527                                                   i_vmtruncate_work);
1528         struct inode *inode = &ci->vfs_inode;
1529
1530         dout("vmtruncate_work %p\n", inode);
1531         __ceph_do_pending_vmtruncate(inode);
1532         iput(inode);
1533 }
1534
1535 /*
1536  * Queue an async vmtruncate.  If we fail to queue work, we will handle
1537  * the truncation the next time we call __ceph_do_pending_vmtruncate.
1538  */
1539 void ceph_queue_vmtruncate(struct inode *inode)
1540 {
1541         struct ceph_inode_info *ci = ceph_inode(inode);
1542
1543         ihold(inode);
1544
1545         if (queue_work(ceph_sb_to_client(inode->i_sb)->trunc_wq,
1546                        &ci->i_vmtruncate_work)) {
1547                 dout("ceph_queue_vmtruncate %p\n", inode);
1548         } else {
1549                 dout("ceph_queue_vmtruncate %p failed, pending=%d\n",
1550                      inode, ci->i_truncate_pending);
1551                 iput(inode);
1552         }
1553 }
1554
1555 /*
1556  * Make sure any pending truncation is applied before doing anything
1557  * that may depend on it.
1558  */
1559 void __ceph_do_pending_vmtruncate(struct inode *inode)
1560 {
1561         struct ceph_inode_info *ci = ceph_inode(inode);
1562         u64 to;
1563         int wrbuffer_refs, finish = 0;
1564
1565         mutex_lock(&ci->i_truncate_mutex);
1566 retry:
1567         spin_lock(&ci->i_ceph_lock);
1568         if (ci->i_truncate_pending == 0) {
1569                 dout("__do_pending_vmtruncate %p none pending\n", inode);
1570                 spin_unlock(&ci->i_ceph_lock);
1571                 mutex_unlock(&ci->i_truncate_mutex);
1572                 return;
1573         }
1574
1575         /*
1576          * make sure any dirty snapped pages are flushed before we
1577          * possibly truncate them.. so write AND block!
1578          */
1579         if (ci->i_wrbuffer_ref_head < ci->i_wrbuffer_ref) {
1580                 dout("__do_pending_vmtruncate %p flushing snaps first\n",
1581                      inode);
1582                 spin_unlock(&ci->i_ceph_lock);
1583                 filemap_write_and_wait_range(&inode->i_data, 0,
1584                                              inode->i_sb->s_maxbytes);
1585                 goto retry;
1586         }
1587
1588         /* there should be no reader or writer */
1589         WARN_ON_ONCE(ci->i_rd_ref || ci->i_wr_ref);
1590
1591         to = ci->i_truncate_size;
1592         wrbuffer_refs = ci->i_wrbuffer_ref;
1593         dout("__do_pending_vmtruncate %p (%d) to %lld\n", inode,
1594              ci->i_truncate_pending, to);
1595         spin_unlock(&ci->i_ceph_lock);
1596
1597         truncate_inode_pages(inode->i_mapping, to);
1598
1599         spin_lock(&ci->i_ceph_lock);
1600         if (to == ci->i_truncate_size) {
1601                 ci->i_truncate_pending = 0;
1602                 finish = 1;
1603         }
1604         spin_unlock(&ci->i_ceph_lock);
1605         if (!finish)
1606                 goto retry;
1607
1608         mutex_unlock(&ci->i_truncate_mutex);
1609
1610         if (wrbuffer_refs == 0)
1611                 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
1612
1613         wake_up_all(&ci->i_cap_wq);
1614 }
1615
1616 /*
1617  * symlinks
1618  */
1619 static void *ceph_sym_follow_link(struct dentry *dentry, struct nameidata *nd)
1620 {
1621         struct ceph_inode_info *ci = ceph_inode(dentry->d_inode);
1622         nd_set_link(nd, ci->i_symlink);
1623         return NULL;
1624 }
1625
1626 static const struct inode_operations ceph_symlink_iops = {
1627         .readlink = generic_readlink,
1628         .follow_link = ceph_sym_follow_link,
1629         .setattr = ceph_setattr,
1630         .getattr = ceph_getattr,
1631         .setxattr = ceph_setxattr,
1632         .getxattr = ceph_getxattr,
1633         .listxattr = ceph_listxattr,
1634         .removexattr = ceph_removexattr,
1635 };
1636
1637 /*
1638  * setattr
1639  */
1640 int ceph_setattr(struct dentry *dentry, struct iattr *attr)
1641 {
1642         struct inode *inode = dentry->d_inode;
1643         struct ceph_inode_info *ci = ceph_inode(inode);
1644         struct inode *parent_inode;
1645         const unsigned int ia_valid = attr->ia_valid;
1646         struct ceph_mds_request *req;
1647         struct ceph_mds_client *mdsc = ceph_sb_to_client(dentry->d_sb)->mdsc;
1648         int issued;
1649         int release = 0, dirtied = 0;
1650         int mask = 0;
1651         int err = 0;
1652         int inode_dirty_flags = 0;
1653
1654         if (ceph_snap(inode) != CEPH_NOSNAP)
1655                 return -EROFS;
1656
1657         err = inode_change_ok(inode, attr);
1658         if (err != 0)
1659                 return err;
1660
1661         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETATTR,
1662                                        USE_AUTH_MDS);
1663         if (IS_ERR(req))
1664                 return PTR_ERR(req);
1665
1666         spin_lock(&ci->i_ceph_lock);
1667         issued = __ceph_caps_issued(ci, NULL);
1668         dout("setattr %p issued %s\n", inode, ceph_cap_string(issued));
1669
1670         if (ia_valid & ATTR_UID) {
1671                 dout("setattr %p uid %d -> %d\n", inode,
1672                      from_kuid(&init_user_ns, inode->i_uid),
1673                      from_kuid(&init_user_ns, attr->ia_uid));
1674                 if (issued & CEPH_CAP_AUTH_EXCL) {
1675                         inode->i_uid = attr->ia_uid;
1676                         dirtied |= CEPH_CAP_AUTH_EXCL;
1677                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1678                            !uid_eq(attr->ia_uid, inode->i_uid)) {
1679                         req->r_args.setattr.uid = cpu_to_le32(
1680                                 from_kuid(&init_user_ns, attr->ia_uid));
1681                         mask |= CEPH_SETATTR_UID;
1682                         release |= CEPH_CAP_AUTH_SHARED;
1683                 }
1684         }
1685         if (ia_valid & ATTR_GID) {
1686                 dout("setattr %p gid %d -> %d\n", inode,
1687                      from_kgid(&init_user_ns, inode->i_gid),
1688                      from_kgid(&init_user_ns, attr->ia_gid));
1689                 if (issued & CEPH_CAP_AUTH_EXCL) {
1690                         inode->i_gid = attr->ia_gid;
1691                         dirtied |= CEPH_CAP_AUTH_EXCL;
1692                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1693                            !gid_eq(attr->ia_gid, inode->i_gid)) {
1694                         req->r_args.setattr.gid = cpu_to_le32(
1695                                 from_kgid(&init_user_ns, attr->ia_gid));
1696                         mask |= CEPH_SETATTR_GID;
1697                         release |= CEPH_CAP_AUTH_SHARED;
1698                 }
1699         }
1700         if (ia_valid & ATTR_MODE) {
1701                 dout("setattr %p mode 0%o -> 0%o\n", inode, inode->i_mode,
1702                      attr->ia_mode);
1703                 if (issued & CEPH_CAP_AUTH_EXCL) {
1704                         inode->i_mode = attr->ia_mode;
1705                         dirtied |= CEPH_CAP_AUTH_EXCL;
1706                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1707                            attr->ia_mode != inode->i_mode) {
1708                         req->r_args.setattr.mode = cpu_to_le32(attr->ia_mode);
1709                         mask |= CEPH_SETATTR_MODE;
1710                         release |= CEPH_CAP_AUTH_SHARED;
1711                 }
1712         }
1713
1714         if (ia_valid & ATTR_ATIME) {
1715                 dout("setattr %p atime %ld.%ld -> %ld.%ld\n", inode,
1716                      inode->i_atime.tv_sec, inode->i_atime.tv_nsec,
1717                      attr->ia_atime.tv_sec, attr->ia_atime.tv_nsec);
1718                 if (issued & CEPH_CAP_FILE_EXCL) {
1719                         ci->i_time_warp_seq++;
1720                         inode->i_atime = attr->ia_atime;
1721                         dirtied |= CEPH_CAP_FILE_EXCL;
1722                 } else if ((issued & CEPH_CAP_FILE_WR) &&
1723                            timespec_compare(&inode->i_atime,
1724                                             &attr->ia_atime) < 0) {
1725                         inode->i_atime = attr->ia_atime;
1726                         dirtied |= CEPH_CAP_FILE_WR;
1727                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1728                            !timespec_equal(&inode->i_atime, &attr->ia_atime)) {
1729                         ceph_encode_timespec(&req->r_args.setattr.atime,
1730                                              &attr->ia_atime);
1731                         mask |= CEPH_SETATTR_ATIME;
1732                         release |= CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_RD |
1733                                 CEPH_CAP_FILE_WR;
1734                 }
1735         }
1736         if (ia_valid & ATTR_MTIME) {
1737                 dout("setattr %p mtime %ld.%ld -> %ld.%ld\n", inode,
1738                      inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
1739                      attr->ia_mtime.tv_sec, attr->ia_mtime.tv_nsec);
1740                 if (issued & CEPH_CAP_FILE_EXCL) {
1741                         ci->i_time_warp_seq++;
1742                         inode->i_mtime = attr->ia_mtime;
1743                         dirtied |= CEPH_CAP_FILE_EXCL;
1744                 } else if ((issued & CEPH_CAP_FILE_WR) &&
1745                            timespec_compare(&inode->i_mtime,
1746                                             &attr->ia_mtime) < 0) {
1747                         inode->i_mtime = attr->ia_mtime;
1748                         dirtied |= CEPH_CAP_FILE_WR;
1749                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1750                            !timespec_equal(&inode->i_mtime, &attr->ia_mtime)) {
1751                         ceph_encode_timespec(&req->r_args.setattr.mtime,
1752                                              &attr->ia_mtime);
1753                         mask |= CEPH_SETATTR_MTIME;
1754                         release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD |
1755                                 CEPH_CAP_FILE_WR;
1756                 }
1757         }
1758         if (ia_valid & ATTR_SIZE) {
1759                 dout("setattr %p size %lld -> %lld\n", inode,
1760                      inode->i_size, attr->ia_size);
1761                 if (attr->ia_size > inode->i_sb->s_maxbytes) {
1762                         err = -EINVAL;
1763                         goto out;
1764                 }
1765                 if ((issued & CEPH_CAP_FILE_EXCL) &&
1766                     attr->ia_size > inode->i_size) {
1767                         inode->i_size = attr->ia_size;
1768                         inode->i_blocks =
1769                                 (attr->ia_size + (1 << 9) - 1) >> 9;
1770                         inode->i_ctime = attr->ia_ctime;
1771                         ci->i_reported_size = attr->ia_size;
1772                         dirtied |= CEPH_CAP_FILE_EXCL;
1773                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1774                            attr->ia_size != inode->i_size) {
1775                         req->r_args.setattr.size = cpu_to_le64(attr->ia_size);
1776                         req->r_args.setattr.old_size =
1777                                 cpu_to_le64(inode->i_size);
1778                         mask |= CEPH_SETATTR_SIZE;
1779                         release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD |
1780                                 CEPH_CAP_FILE_WR;
1781                 }
1782         }
1783
1784         /* these do nothing */
1785         if (ia_valid & ATTR_CTIME) {
1786                 bool only = (ia_valid & (ATTR_SIZE|ATTR_MTIME|ATTR_ATIME|
1787                                          ATTR_MODE|ATTR_UID|ATTR_GID)) == 0;
1788                 dout("setattr %p ctime %ld.%ld -> %ld.%ld (%s)\n", inode,
1789                      inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
1790                      attr->ia_ctime.tv_sec, attr->ia_ctime.tv_nsec,
1791                      only ? "ctime only" : "ignored");
1792                 inode->i_ctime = attr->ia_ctime;
1793                 if (only) {
1794                         /*
1795                          * if kernel wants to dirty ctime but nothing else,
1796                          * we need to choose a cap to dirty under, or do
1797                          * a almost-no-op setattr
1798                          */
1799                         if (issued & CEPH_CAP_AUTH_EXCL)
1800                                 dirtied |= CEPH_CAP_AUTH_EXCL;
1801                         else if (issued & CEPH_CAP_FILE_EXCL)
1802                                 dirtied |= CEPH_CAP_FILE_EXCL;
1803                         else if (issued & CEPH_CAP_XATTR_EXCL)
1804                                 dirtied |= CEPH_CAP_XATTR_EXCL;
1805                         else
1806                                 mask |= CEPH_SETATTR_CTIME;
1807                 }
1808         }
1809         if (ia_valid & ATTR_FILE)
1810                 dout("setattr %p ATTR_FILE ... hrm!\n", inode);
1811
1812         if (dirtied) {
1813                 inode_dirty_flags = __ceph_mark_dirty_caps(ci, dirtied);
1814                 inode->i_ctime = CURRENT_TIME;
1815         }
1816
1817         release &= issued;
1818         spin_unlock(&ci->i_ceph_lock);
1819
1820         if (inode_dirty_flags)
1821                 __mark_inode_dirty(inode, inode_dirty_flags);
1822
1823         if (mask) {
1824                 req->r_inode = inode;
1825                 ihold(inode);
1826                 req->r_inode_drop = release;
1827                 req->r_args.setattr.mask = cpu_to_le32(mask);
1828                 req->r_num_caps = 1;
1829                 parent_inode = ceph_get_dentry_parent_inode(dentry);
1830                 err = ceph_mdsc_do_request(mdsc, parent_inode, req);
1831                 iput(parent_inode);
1832         }
1833         dout("setattr %p result=%d (%s locally, %d remote)\n", inode, err,
1834              ceph_cap_string(dirtied), mask);
1835
1836         ceph_mdsc_put_request(req);
1837         if (mask & CEPH_SETATTR_SIZE)
1838                 __ceph_do_pending_vmtruncate(inode);
1839         return err;
1840 out:
1841         spin_unlock(&ci->i_ceph_lock);
1842         ceph_mdsc_put_request(req);
1843         return err;
1844 }
1845
1846 /*
1847  * Verify that we have a lease on the given mask.  If not,
1848  * do a getattr against an mds.
1849  */
1850 int ceph_do_getattr(struct inode *inode, int mask)
1851 {
1852         struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
1853         struct ceph_mds_client *mdsc = fsc->mdsc;
1854         struct ceph_mds_request *req;
1855         int err;
1856
1857         if (ceph_snap(inode) == CEPH_SNAPDIR) {
1858                 dout("do_getattr inode %p SNAPDIR\n", inode);
1859                 return 0;
1860         }
1861
1862         dout("do_getattr inode %p mask %s mode 0%o\n", inode, ceph_cap_string(mask), inode->i_mode);
1863         if (ceph_caps_issued_mask(ceph_inode(inode), mask, 1))
1864                 return 0;
1865
1866         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
1867         if (IS_ERR(req))
1868                 return PTR_ERR(req);
1869         req->r_inode = inode;
1870         ihold(inode);
1871         req->r_num_caps = 1;
1872         req->r_args.getattr.mask = cpu_to_le32(mask);
1873         err = ceph_mdsc_do_request(mdsc, NULL, req);
1874         ceph_mdsc_put_request(req);
1875         dout("do_getattr result=%d\n", err);
1876         return err;
1877 }
1878
1879
1880 /*
1881  * Check inode permissions.  We verify we have a valid value for
1882  * the AUTH cap, then call the generic handler.
1883  */
1884 int ceph_permission(struct inode *inode, int mask)
1885 {
1886         int err;
1887
1888         if (mask & MAY_NOT_BLOCK)
1889                 return -ECHILD;
1890
1891         err = ceph_do_getattr(inode, CEPH_CAP_AUTH_SHARED);
1892
1893         if (!err)
1894                 err = generic_permission(inode, mask);
1895         return err;
1896 }
1897
1898 /*
1899  * Get all attributes.  Hopefully somedata we'll have a statlite()
1900  * and can limit the fields we require to be accurate.
1901  */
1902 int ceph_getattr(struct vfsmount *mnt, struct dentry *dentry,
1903                  struct kstat *stat)
1904 {
1905         struct inode *inode = dentry->d_inode;
1906         struct ceph_inode_info *ci = ceph_inode(inode);
1907         int err;
1908
1909         err = ceph_do_getattr(inode, CEPH_STAT_CAP_INODE_ALL);
1910         if (!err) {
1911                 generic_fillattr(inode, stat);
1912                 stat->ino = ceph_translate_ino(inode->i_sb, inode->i_ino);
1913                 if (ceph_snap(inode) != CEPH_NOSNAP)
1914                         stat->dev = ceph_snap(inode);
1915                 else
1916                         stat->dev = 0;
1917                 if (S_ISDIR(inode->i_mode)) {
1918                         if (ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb),
1919                                                 RBYTES))
1920                                 stat->size = ci->i_rbytes;
1921                         else
1922                                 stat->size = ci->i_files + ci->i_subdirs;
1923                         stat->blocks = 0;
1924                         stat->blksize = 65536;
1925                 }
1926         }
1927         return err;
1928 }