fs/ceph/inode.c

   1 #include <linux/ceph/ceph_debug.h>
   2
   3 #include <linux/module.h>
   4 #include <linux/fs.h>
   5 #include <linux/slab.h>
   6 #include <linux/string.h>
   7 #include <linux/uaccess.h>
   8 #include <linux/kernel.h>
   9 #include <linux/namei.h>
  10 #include <linux/writeback.h>
  11 #include <linux/vmalloc.h>
  12 #include <linux/posix_acl.h>
  13
  14 #include "super.h"
  15 #include "mds_client.h"
  16 #include "cache.h"
  17 #include <linux/ceph/decode.h>
  18
  19 /*
  20  * Ceph inode operations
  21  *
  22  * Implement basic inode helpers (get, alloc) and inode ops (getattr,
  23  * setattr, etc.), xattr helpers, and helpers for assimilating
  24  * metadata returned by the MDS into our cache.
  25  *
  26  * Also define helpers for doing asynchronous writeback, invalidation,
  27  * and truncation for the benefit of those who can't afford to block
  28  * (typically because they are in the message handler path).
  29  */
  30
  31 static const struct inode_operations ceph_symlink_iops;
  32
  33 static void ceph_invalidate_work(struct work_struct *work);
  34 static void ceph_writeback_work(struct work_struct *work);
  35 static void ceph_vmtruncate_work(struct work_struct *work);
  36
  37 /*
  38  * find or create an inode, given the ceph ino number
  39  */
  40 static int ceph_set_ino_cb(struct inode *inode, void *data)
  41 {
  42         ceph_inode(inode)->i_vino = *(struct ceph_vino *)data;
  43         inode->i_ino = ceph_vino_to_ino(*(struct ceph_vino *)data);
  44         return 0;
  45 }
  46
  47 struct inode *ceph_get_inode(struct super_block *sb, struct ceph_vino vino)
  48 {
  49         struct inode *inode;
  50         ino_t t = ceph_vino_to_ino(vino);
  51
  52         inode = iget5_locked(sb, t, ceph_ino_compare, ceph_set_ino_cb, &vino);
  53         if (inode == NULL)
  54                 return ERR_PTR(-ENOMEM);
  55         if (inode->i_state & I_NEW) {
  56                 dout("get_inode created new inode %p %llx.%llx ino %llx\n",
  57                      inode, ceph_vinop(inode), (u64)inode->i_ino);
  58                 unlock_new_inode(inode);
  59         }
  60
  61         dout("get_inode on %lu=%llx.%llx got %p\n", inode->i_ino, vino.ino,
  62              vino.snap, inode);
  63         return inode;
  64 }
  65
  66 /*
  67  * get/constuct snapdir inode for a given directory
  68  */
  69 struct inode *ceph_get_snapdir(struct inode *parent)
  70 {
  71         struct ceph_vino vino = {
  72                 .ino = ceph_ino(parent),
  73                 .snap = CEPH_SNAPDIR,
  74         };
  75         struct inode *inode = ceph_get_inode(parent->i_sb, vino);
  76         struct ceph_inode_info *ci = ceph_inode(inode);
  77
  78         BUG_ON(!S_ISDIR(parent->i_mode));
  79         if (IS_ERR(inode))
  80                 return inode;
  81         inode->i_mode = parent->i_mode;
  82         inode->i_uid = parent->i_uid;
  83         inode->i_gid = parent->i_gid;
  84         inode->i_op = &ceph_dir_iops;
  85         inode->i_fop = &ceph_dir_fops;
  86         ci->i_snap_caps = CEPH_CAP_PIN; /* so we can open */
  87         ci->i_rbytes = 0;
  88         return inode;
  89 }
  90
  91 const struct inode_operations ceph_file_iops = {
  92         .permission = ceph_permission,
  93         .setattr = ceph_setattr,
  94         .getattr = ceph_getattr,
  95         .setxattr = ceph_setxattr,
  96         .getxattr = ceph_getxattr,
  97         .listxattr = ceph_listxattr,
  98         .removexattr = ceph_removexattr,
  99         .get_acl = ceph_get_acl,
 100         .set_acl = ceph_set_acl,
 101 };
 102
 103
 104 /*
 105  * We use a 'frag tree' to keep track of the MDS's directory fragments
 106  * for a given inode (usually there is just a single fragment).  We
 107  * need to know when a child frag is delegated to a new MDS, or when
 108  * it is flagged as replicated, so we can direct our requests
 109  * accordingly.
 110  */
 111
 112 /*
 113  * find/create a frag in the tree
 114  */
 115 static struct ceph_inode_frag *__get_or_create_frag(struct ceph_inode_info *ci,
 116                                                     u32 f)
 117 {
 118         struct rb_node **p;
 119         struct rb_node *parent = NULL;
 120         struct ceph_inode_frag *frag;
 121         int c;
 122
 123         p = &ci->i_fragtree.rb_node;
 124         while (*p) {
 125                 parent = *p;
 126                 frag = rb_entry(parent, struct ceph_inode_frag, node);
 127                 c = ceph_frag_compare(f, frag->frag);
 128                 if (c < 0)
 129                         p = &(*p)->rb_left;
 130                 else if (c > 0)
 131                         p = &(*p)->rb_right;
 132                 else
 133                         return frag;
 134         }
 135
 136         frag = kmalloc(sizeof(*frag), GFP_NOFS);
 137         if (!frag) {
 138                 pr_err("__get_or_create_frag ENOMEM on %p %llx.%llx "
 139                        "frag %x\n", &ci->vfs_inode,
 140                        ceph_vinop(&ci->vfs_inode), f);
 141                 return ERR_PTR(-ENOMEM);
 142         }
 143         frag->frag = f;
 144         frag->split_by = 0;
 145         frag->mds = -1;
 146         frag->ndist = 0;
 147
 148         rb_link_node(&frag->node, parent, p);
 149         rb_insert_color(&frag->node, &ci->i_fragtree);
 150
 151         dout("get_or_create_frag added %llx.%llx frag %x\n",
 152              ceph_vinop(&ci->vfs_inode), f);
 153         return frag;
 154 }
 155
 156 /*
 157  * find a specific frag @f
 158  */
 159 struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci, u32 f)
 160 {
 161         struct rb_node *n = ci->i_fragtree.rb_node;
 162
 163         while (n) {
 164                 struct ceph_inode_frag *frag =
 165                         rb_entry(n, struct ceph_inode_frag, node);
 166                 int c = ceph_frag_compare(f, frag->frag);
 167                 if (c < 0)
 168                         n = n->rb_left;
 169                 else if (c > 0)
 170                         n = n->rb_right;
 171                 else
 172                         return frag;
 173         }
 174         return NULL;
 175 }
 176
 177 /*
 178  * Choose frag containing the given value @v.  If @pfrag is
 179  * specified, copy the frag delegation info to the caller if
 180  * it is present.
 181  */
 182 u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
 183                      struct ceph_inode_frag *pfrag,
 184                      int *found)
 185 {
 186         u32 t = ceph_frag_make(0, 0);
 187         struct ceph_inode_frag *frag;
 188         unsigned nway, i;
 189         u32 n;
 190
 191         if (found)
 192                 *found = 0;
 193
 194         mutex_lock(&ci->i_fragtree_mutex);
 195         while (1) {
 196                 WARN_ON(!ceph_frag_contains_value(t, v));
 197                 frag = __ceph_find_frag(ci, t);
 198                 if (!frag)
 199                         break; /* t is a leaf */
 200                 if (frag->split_by == 0) {
 201                         if (pfrag)
 202                                 memcpy(pfrag, frag, sizeof(*pfrag));
 203                         if (found)
 204                                 *found = 1;
 205                         break;
 206                 }
 207
 208                 /* choose child */
 209                 nway = 1 << frag->split_by;
 210                 dout("choose_frag(%x) %x splits by %d (%d ways)\n", v, t,
 211                      frag->split_by, nway);
 212                 for (i = 0; i < nway; i++) {
 213                         n = ceph_frag_make_child(t, frag->split_by, i);
 214                         if (ceph_frag_contains_value(n, v)) {
 215                                 t = n;
 216                                 break;
 217                         }
 218                 }
 219                 BUG_ON(i == nway);
 220         }
 221         dout("choose_frag(%x) = %x\n", v, t);
 222
 223         mutex_unlock(&ci->i_fragtree_mutex);
 224         return t;
 225 }
 226
 227 /*
 228  * Process dirfrag (delegation) info from the mds.  Include leaf
 229  * fragment in tree ONLY if ndist > 0.  Otherwise, only
 230  * branches/splits are included in i_fragtree)
 231  */
 232 static int ceph_fill_dirfrag(struct inode *inode,
 233                              struct ceph_mds_reply_dirfrag *dirinfo)
 234 {
 235         struct ceph_inode_info *ci = ceph_inode(inode);
 236         struct ceph_inode_frag *frag;
 237         u32 id = le32_to_cpu(dirinfo->frag);
 238         int mds = le32_to_cpu(dirinfo->auth);
 239         int ndist = le32_to_cpu(dirinfo->ndist);
 240         int i;
 241         int err = 0;
 242
 243         mutex_lock(&ci->i_fragtree_mutex);
 244         if (ndist == 0) {
 245                 /* no delegation info needed. */
 246                 frag = __ceph_find_frag(ci, id);
 247                 if (!frag)
 248                         goto out;
 249                 if (frag->split_by == 0) {
 250                         /* tree leaf, remove */
 251                         dout("fill_dirfrag removed %llx.%llx frag %x"
 252                              " (no ref)\n", ceph_vinop(inode), id);
 253                         rb_erase(&frag->node, &ci->i_fragtree);
 254                         kfree(frag);
 255                 } else {
 256                         /* tree branch, keep and clear */
 257                         dout("fill_dirfrag cleared %llx.%llx frag %x"
 258                              " referral\n", ceph_vinop(inode), id);
 259                         frag->mds = -1;
 260                         frag->ndist = 0;
 261                 }
 262                 goto out;
 263         }
 264
 265
 266         /* find/add this frag to store mds delegation info */
 267         frag = __get_or_create_frag(ci, id);
 268         if (IS_ERR(frag)) {
 269                 /* this is not the end of the world; we can continue
 270                    with bad/inaccurate delegation info */
 271                 pr_err("fill_dirfrag ENOMEM on mds ref %llx.%llx fg %x\n",
 272                        ceph_vinop(inode), le32_to_cpu(dirinfo->frag));
 273                 err = -ENOMEM;
 274                 goto out;
 275         }
 276
 277         frag->mds = mds;
 278         frag->ndist = min_t(u32, ndist, CEPH_MAX_DIRFRAG_REP);
 279         for (i = 0; i < frag->ndist; i++)
 280                 frag->dist[i] = le32_to_cpu(dirinfo->dist[i]);
 281         dout("fill_dirfrag %llx.%llx frag %x ndist=%d\n",
 282              ceph_vinop(inode), frag->frag, frag->ndist);
 283
 284 out:
 285         mutex_unlock(&ci->i_fragtree_mutex);
 286         return err;
 287 }
 288
 289
 290 /*
 291  * initialize a newly allocated inode.
 292  */
 293 struct inode *ceph_alloc_inode(struct super_block *sb)
 294 {
 295         struct ceph_inode_info *ci;
 296         int i;
 297
 298         ci = kmem_cache_alloc(ceph_inode_cachep, GFP_NOFS);
 299         if (!ci)
 300                 return NULL;
 301
 302         dout("alloc_inode %p\n", &ci->vfs_inode);
 303
 304         spin_lock_init(&ci->i_ceph_lock);
 305
 306         ci->i_version = 0;
 307         ci->i_time_warp_seq = 0;
 308         ci->i_ceph_flags = 0;
 309         atomic_set(&ci->i_release_count, 1);
 310         atomic_set(&ci->i_complete_count, 0);
 311         ci->i_symlink = NULL;
 312
 313         memset(&ci->i_dir_layout, 0, sizeof(ci->i_dir_layout));
 314
 315         ci->i_fragtree = RB_ROOT;
 316         mutex_init(&ci->i_fragtree_mutex);
 317
 318         ci->i_xattrs.blob = NULL;
 319         ci->i_xattrs.prealloc_blob = NULL;
 320         ci->i_xattrs.dirty = false;
 321         ci->i_xattrs.index = RB_ROOT;
 322         ci->i_xattrs.count = 0;
 323         ci->i_xattrs.names_size = 0;
 324         ci->i_xattrs.vals_size = 0;
 325         ci->i_xattrs.version = 0;
 326         ci->i_xattrs.index_version = 0;
 327
 328         ci->i_caps = RB_ROOT;
 329         ci->i_auth_cap = NULL;
 330         ci->i_dirty_caps = 0;
 331         ci->i_flushing_caps = 0;
 332         INIT_LIST_HEAD(&ci->i_dirty_item);
 333         INIT_LIST_HEAD(&ci->i_flushing_item);
 334         ci->i_cap_flush_seq = 0;
 335         ci->i_cap_flush_last_tid = 0;
 336         memset(&ci->i_cap_flush_tid, 0, sizeof(ci->i_cap_flush_tid));
 337         init_waitqueue_head(&ci->i_cap_wq);
 338         ci->i_hold_caps_min = 0;
 339         ci->i_hold_caps_max = 0;
 340         INIT_LIST_HEAD(&ci->i_cap_delay_list);
 341         INIT_LIST_HEAD(&ci->i_cap_snaps);
 342         ci->i_head_snapc = NULL;
 343         ci->i_snap_caps = 0;
 344         ci->i_cap_exporting_issued = 0;
 345
 346         for (i = 0; i < CEPH_FILE_MODE_NUM; i++)
 347                 ci->i_nr_by_mode[i] = 0;
 348
 349         mutex_init(&ci->i_truncate_mutex);
 350         ci->i_truncate_seq = 0;
 351         ci->i_truncate_size = 0;
 352         ci->i_truncate_pending = 0;
 353
 354         ci->i_max_size = 0;
 355         ci->i_reported_size = 0;
 356         ci->i_wanted_max_size = 0;
 357         ci->i_requested_max_size = 0;
 358
 359         ci->i_pin_ref = 0;
 360         ci->i_rd_ref = 0;
 361         ci->i_rdcache_ref = 0;
 362         ci->i_wr_ref = 0;
 363         ci->i_wb_ref = 0;
 364         ci->i_wrbuffer_ref = 0;
 365         ci->i_wrbuffer_ref_head = 0;
 366         ci->i_shared_gen = 0;
 367         ci->i_rdcache_gen = 0;
 368         ci->i_rdcache_revoking = 0;
 369
 370         INIT_LIST_HEAD(&ci->i_unsafe_writes);
 371         INIT_LIST_HEAD(&ci->i_unsafe_dirops);
 372         spin_lock_init(&ci->i_unsafe_lock);
 373
 374         ci->i_snap_realm = NULL;
 375         INIT_LIST_HEAD(&ci->i_snap_realm_item);
 376         INIT_LIST_HEAD(&ci->i_snap_flush_item);
 377
 378         INIT_WORK(&ci->i_wb_work, ceph_writeback_work);
 379         INIT_WORK(&ci->i_pg_inv_work, ceph_invalidate_work);
 380
 381         INIT_WORK(&ci->i_vmtruncate_work, ceph_vmtruncate_work);
 382
 383         ceph_fscache_inode_init(ci);
 384
 385         return &ci->vfs_inode;
 386 }
 387
 388 static void ceph_i_callback(struct rcu_head *head)
 389 {
 390         struct inode *inode = container_of(head, struct inode, i_rcu);
 391         struct ceph_inode_info *ci = ceph_inode(inode);
 392
 393         kmem_cache_free(ceph_inode_cachep, ci);
 394 }
 395
 396 void ceph_destroy_inode(struct inode *inode)
 397 {
 398         struct ceph_inode_info *ci = ceph_inode(inode);
 399         struct ceph_inode_frag *frag;
 400         struct rb_node *n;
 401
 402         dout("destroy_inode %p ino %llx.%llx\n", inode, ceph_vinop(inode));
 403
 404         ceph_fscache_unregister_inode_cookie(ci);
 405
 406         ceph_queue_caps_release(inode);
 407
 408         /*
 409          * we may still have a snap_realm reference if there are stray
 410          * caps in i_cap_exporting_issued or i_snap_caps.
 411          */
 412         if (ci->i_snap_realm) {
 413                 struct ceph_mds_client *mdsc =
 414                         ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc;
 415                 struct ceph_snap_realm *realm = ci->i_snap_realm;
 416
 417                 dout(" dropping residual ref to snap realm %p\n", realm);
 418                 spin_lock(&realm->inodes_with_caps_lock);
 419                 list_del_init(&ci->i_snap_realm_item);
 420                 spin_unlock(&realm->inodes_with_caps_lock);
 421                 ceph_put_snap_realm(mdsc, realm);
 422         }
 423
 424         kfree(ci->i_symlink);
 425         while ((n = rb_first(&ci->i_fragtree)) != NULL) {
 426                 frag = rb_entry(n, struct ceph_inode_frag, node);
 427                 rb_erase(n, &ci->i_fragtree);
 428                 kfree(frag);
 429         }
 430
 431         __ceph_destroy_xattrs(ci);
 432         if (ci->i_xattrs.blob)
 433                 ceph_buffer_put(ci->i_xattrs.blob);
 434         if (ci->i_xattrs.prealloc_blob)
 435                 ceph_buffer_put(ci->i_xattrs.prealloc_blob);
 436
 437         call_rcu(&inode->i_rcu, ceph_i_callback);
 438 }
 439
 440 int ceph_drop_inode(struct inode *inode)
 441 {
 442         /*
 443          * Positve dentry and corresponding inode are always accompanied
 444          * in MDS reply. So no need to keep inode in the cache after
 445          * dropping all its aliases.
 446          */
 447         return 1;
 448 }
 449
 450 /*
 451  * Helpers to fill in size, ctime, mtime, and atime.  We have to be
 452  * careful because either the client or MDS may have more up to date
 453  * info, depending on which capabilities are held, and whether
 454  * time_warp_seq or truncate_seq have increased.  (Ordinarily, mtime
 455  * and size are monotonically increasing, except when utimes() or
 456  * truncate() increments the corresponding _seq values.)
 457  */
 458 int ceph_fill_file_size(struct inode *inode, int issued,
 459                         u32 truncate_seq, u64 truncate_size, u64 size)
 460 {
 461         struct ceph_inode_info *ci = ceph_inode(inode);
 462         int queue_trunc = 0;
 463
 464         if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) > 0 ||
 465             (truncate_seq == ci->i_truncate_seq && size > inode->i_size)) {
 466                 dout("size %lld -> %llu\n", inode->i_size, size);
 467                 inode->i_size = size;
 468                 inode->i_blocks = (size + (1<<9) - 1) >> 9;
 469                 ci->i_reported_size = size;
 470                 if (truncate_seq != ci->i_truncate_seq) {
 471                         dout("truncate_seq %u -> %u\n",
 472                              ci->i_truncate_seq, truncate_seq);
 473                         ci->i_truncate_seq = truncate_seq;
 474
 475                         /* the MDS should have revoked these caps */
 476                         WARN_ON_ONCE(issued & (CEPH_CAP_FILE_EXCL |
 477                                                CEPH_CAP_FILE_RD |
 478                                                CEPH_CAP_FILE_WR |
 479                                                CEPH_CAP_FILE_LAZYIO));
 480                         /*
 481                          * If we hold relevant caps, or in the case where we're
 482                          * not the only client referencing this file and we
 483                          * don't hold those caps, then we need to check whether
 484                          * the file is either opened or mmaped
 485                          */
 486                         if ((issued & (CEPH_CAP_FILE_CACHE|
 487                                        CEPH_CAP_FILE_BUFFER)) ||
 488                             mapping_mapped(inode->i_mapping) ||
 489                             __ceph_caps_file_wanted(ci)) {
 490                                 ci->i_truncate_pending++;
 491                                 queue_trunc = 1;
 492                         }
 493                 }
 494         }
 495         if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) >= 0 &&
 496             ci->i_truncate_size != truncate_size) {
 497                 dout("truncate_size %lld -> %llu\n", ci->i_truncate_size,
 498                      truncate_size);
 499                 ci->i_truncate_size = truncate_size;
 500         }
 501
 502         if (queue_trunc)
 503                 ceph_fscache_invalidate(inode);
 504
 505         return queue_trunc;
 506 }
 507
 508 void ceph_fill_file_time(struct inode *inode, int issued,
 509                          u64 time_warp_seq, struct timespec *ctime,
 510                          struct timespec *mtime, struct timespec *atime)
 511 {
 512         struct ceph_inode_info *ci = ceph_inode(inode);
 513         int warn = 0;
 514
 515         if (issued & (CEPH_CAP_FILE_EXCL|
 516                       CEPH_CAP_FILE_WR|
 517                       CEPH_CAP_FILE_BUFFER|
 518                       CEPH_CAP_AUTH_EXCL|
 519                       CEPH_CAP_XATTR_EXCL)) {
 520                 if (timespec_compare(ctime, &inode->i_ctime) > 0) {
 521                         dout("ctime %ld.%09ld -> %ld.%09ld inc w/ cap\n",
 522                              inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
 523                              ctime->tv_sec, ctime->tv_nsec);
 524                         inode->i_ctime = *ctime;
 525                 }
 526                 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) > 0) {
 527                         /* the MDS did a utimes() */
 528                         dout("mtime %ld.%09ld -> %ld.%09ld "
 529                              "tw %d -> %d\n",
 530                              inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
 531                              mtime->tv_sec, mtime->tv_nsec,
 532                              ci->i_time_warp_seq, (int)time_warp_seq);
 533
 534                         inode->i_mtime = *mtime;
 535                         inode->i_atime = *atime;
 536                         ci->i_time_warp_seq = time_warp_seq;
 537                 } else if (time_warp_seq == ci->i_time_warp_seq) {
 538                         /* nobody did utimes(); take the max */
 539                         if (timespec_compare(mtime, &inode->i_mtime) > 0) {
 540                                 dout("mtime %ld.%09ld -> %ld.%09ld inc\n",
 541                                      inode->i_mtime.tv_sec,
 542                                      inode->i_mtime.tv_nsec,
 543                                      mtime->tv_sec, mtime->tv_nsec);
 544                                 inode->i_mtime = *mtime;
 545                         }
 546                         if (timespec_compare(atime, &inode->i_atime) > 0) {
 547                                 dout("atime %ld.%09ld -> %ld.%09ld inc\n",
 548                                      inode->i_atime.tv_sec,
 549                                      inode->i_atime.tv_nsec,
 550                                      atime->tv_sec, atime->tv_nsec);
 551                                 inode->i_atime = *atime;
 552                         }
 553                 } else if (issued & CEPH_CAP_FILE_EXCL) {
 554                         /* we did a utimes(); ignore mds values */
 555                 } else {
 556                         warn = 1;
 557                 }
 558         } else {
 559                 /* we have no write|excl caps; whatever the MDS says is true */
 560                 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) >= 0) {
 561                         inode->i_ctime = *ctime;
 562                         inode->i_mtime = *mtime;
 563                         inode->i_atime = *atime;
 564                         ci->i_time_warp_seq = time_warp_seq;
 565                 } else {
 566                         warn = 1;
 567                 }
 568         }
 569         if (warn) /* time_warp_seq shouldn't go backwards */
 570                 dout("%p mds time_warp_seq %llu < %u\n",
 571                      inode, time_warp_seq, ci->i_time_warp_seq);
 572 }
 573
 574 /*
 575  * Populate an inode based on info from mds.  May be called on new or
 576  * existing inodes.
 577  */
 578 static int fill_inode(struct inode *inode,
 579                       struct ceph_mds_reply_info_in *iinfo,
 580                       struct ceph_mds_reply_dirfrag *dirinfo,
 581                       struct ceph_mds_session *session,
 582                       unsigned long ttl_from, int cap_fmode,
 583                       struct ceph_cap_reservation *caps_reservation)
 584 {
 585         struct ceph_mds_reply_inode *info = iinfo->in;
 586         struct ceph_inode_info *ci = ceph_inode(inode);
 587         int i;
 588         int issued = 0, implemented, new_issued;
 589         struct timespec mtime, atime, ctime;
 590         u32 nsplits;
 591         struct ceph_inode_frag *frag;
 592         struct rb_node *rb_node;
 593         struct ceph_buffer *xattr_blob = NULL;
 594         int err = 0;
 595         bool queue_trunc = false;
 596         bool new_version = false;
 597
 598         dout("fill_inode %p ino %llx.%llx v %llu had %llu\n",
 599              inode, ceph_vinop(inode), le64_to_cpu(info->version),
 600              ci->i_version);
 601
 602         /*
 603          * prealloc xattr data, if it looks like we'll need it.  only
 604          * if len > 4 (meaning there are actually xattrs; the first 4
 605          * bytes are the xattr count).
 606          */
 607         if (iinfo->xattr_len > 4) {
 608                 xattr_blob = ceph_buffer_new(iinfo->xattr_len, GFP_NOFS);
 609                 if (!xattr_blob)
 610                         pr_err("fill_inode ENOMEM xattr blob %d bytes\n",
 611                                iinfo->xattr_len);
 612         }
 613
 614         spin_lock(&ci->i_ceph_lock);
 615
 616         /*
 617          * provided version will be odd if inode value is projected,
 618          * even if stable.  skip the update if we have newer stable
 619          * info (ours>=theirs, e.g. due to racing mds replies), unless
 620          * we are getting projected (unstable) info (in which case the
 621          * version is odd, and we want ours>theirs).
 622          *   us   them
 623          *   2    2     skip
 624          *   3    2     skip
 625          *   3    3     update
 626          */
 627         if (ci->i_version == 0 ||
 628             ((info->cap.flags & CEPH_CAP_FLAG_AUTH) &&
 629              le64_to_cpu(info->version) > (ci->i_version & ~1)))
 630                 new_version = true;
 631
 632         issued = __ceph_caps_issued(ci, &implemented);
 633         issued |= implemented | __ceph_caps_dirty(ci);
 634         new_issued = ~issued & le32_to_cpu(info->cap.caps);
 635
 636         /* update inode */
 637         ci->i_version = le64_to_cpu(info->version);
 638         inode->i_version++;
 639         inode->i_rdev = le32_to_cpu(info->rdev);
 640         inode->i_blkbits = fls(le32_to_cpu(info->layout.fl_stripe_unit)) - 1;
 641
 642         if ((new_version || (new_issued & CEPH_CAP_AUTH_SHARED)) &&
 643             (issued & CEPH_CAP_AUTH_EXCL) == 0) {
 644                 inode->i_mode = le32_to_cpu(info->mode);
 645                 inode->i_uid = make_kuid(&init_user_ns, le32_to_cpu(info->uid));
 646                 inode->i_gid = make_kgid(&init_user_ns, le32_to_cpu(info->gid));
 647                 dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode,
 648                      from_kuid(&init_user_ns, inode->i_uid),
 649                      from_kgid(&init_user_ns, inode->i_gid));
 650         }
 651
 652         if ((new_version || (new_issued & CEPH_CAP_LINK_SHARED)) &&
 653             (issued & CEPH_CAP_LINK_EXCL) == 0)
 654                 set_nlink(inode, le32_to_cpu(info->nlink));
 655
 656         if (new_version || (new_issued & CEPH_CAP_ANY_RD)) {
 657                 /* be careful with mtime, atime, size */
 658                 ceph_decode_timespec(&atime, &info->atime);
 659                 ceph_decode_timespec(&mtime, &info->mtime);
 660                 ceph_decode_timespec(&ctime, &info->ctime);
 661                 ceph_fill_file_time(inode, issued,
 662                                 le32_to_cpu(info->time_warp_seq),
 663                                 &ctime, &mtime, &atime);
 664         }
 665
 666         if (new_version ||
 667             (new_issued & (CEPH_CAP_ANY_FILE_RD | CEPH_CAP_ANY_FILE_WR))) {
 668                 ci->i_layout = info->layout;
 669                 queue_trunc = ceph_fill_file_size(inode, issued,
 670                                         le32_to_cpu(info->truncate_seq),
 671                                         le64_to_cpu(info->truncate_size),
 672                                         le64_to_cpu(info->size));
 673                 /* only update max_size on auth cap */
 674                 if ((info->cap.flags & CEPH_CAP_FLAG_AUTH) &&
 675                     ci->i_max_size != le64_to_cpu(info->max_size)) {
 676                         dout("max_size %lld -> %llu\n", ci->i_max_size,
 677                                         le64_to_cpu(info->max_size));
 678                         ci->i_max_size = le64_to_cpu(info->max_size);
 679                 }
 680         }
 681
 682         /* xattrs */
 683         /* note that if i_xattrs.len <= 4, i_xattrs.data will still be NULL. */
 684         if ((issued & CEPH_CAP_XATTR_EXCL) == 0 &&
 685             le64_to_cpu(info->xattr_version) > ci->i_xattrs.version) {
 686                 if (ci->i_xattrs.blob)
 687                         ceph_buffer_put(ci->i_xattrs.blob);
 688                 ci->i_xattrs.blob = xattr_blob;
 689                 if (xattr_blob)
 690                         memcpy(ci->i_xattrs.blob->vec.iov_base,
 691                                iinfo->xattr_data, iinfo->xattr_len);
 692                 ci->i_xattrs.version = le64_to_cpu(info->xattr_version);
 693                 ceph_forget_all_cached_acls(inode);
 694                 xattr_blob = NULL;
 695         }
 696
 697         inode->i_mapping->a_ops = &ceph_aops;
 698         inode->i_mapping->backing_dev_info =
 699                 &ceph_sb_to_client(inode->i_sb)->backing_dev_info;
 700
 701         switch (inode->i_mode & S_IFMT) {
 702         case S_IFIFO:
 703         case S_IFBLK:
 704         case S_IFCHR:
 705         case S_IFSOCK:
 706                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
 707                 inode->i_op = &ceph_file_iops;
 708                 break;
 709         case S_IFREG:
 710                 inode->i_op = &ceph_file_iops;
 711                 inode->i_fop = &ceph_file_fops;
 712                 break;
 713         case S_IFLNK:
 714                 inode->i_op = &ceph_symlink_iops;
 715                 if (!ci->i_symlink) {
 716                         u32 symlen = iinfo->symlink_len;
 717                         char *sym;
 718
 719                         spin_unlock(&ci->i_ceph_lock);
 720
 721                         err = -EINVAL;
 722                         if (WARN_ON(symlen != inode->i_size))
 723                                 goto out;
 724
 725                         err = -ENOMEM;
 726                         sym = kstrndup(iinfo->symlink, symlen, GFP_NOFS);
 727                         if (!sym)
 728                                 goto out;
 729
 730                         spin_lock(&ci->i_ceph_lock);
 731                         if (!ci->i_symlink)
 732                                 ci->i_symlink = sym;
 733                         else
 734                                 kfree(sym); /* lost a race */
 735                 }
 736                 break;
 737         case S_IFDIR:
 738                 inode->i_op = &ceph_dir_iops;
 739                 inode->i_fop = &ceph_dir_fops;
 740
 741                 ci->i_dir_layout = iinfo->dir_layout;
 742
 743                 ci->i_files = le64_to_cpu(info->files);
 744                 ci->i_subdirs = le64_to_cpu(info->subdirs);
 745                 ci->i_rbytes = le64_to_cpu(info->rbytes);
 746                 ci->i_rfiles = le64_to_cpu(info->rfiles);
 747                 ci->i_rsubdirs = le64_to_cpu(info->rsubdirs);
 748                 ceph_decode_timespec(&ci->i_rctime, &info->rctime);
 749                 break;
 750         default:
 751                 pr_err("fill_inode %llx.%llx BAD mode 0%o\n",
 752                        ceph_vinop(inode), inode->i_mode);
 753         }
 754
 755         /* set dir completion flag? */
 756         if (S_ISDIR(inode->i_mode) &&
 757             ci->i_files == 0 && ci->i_subdirs == 0 &&
 758             ceph_snap(inode) == CEPH_NOSNAP &&
 759             (le32_to_cpu(info->cap.caps) & CEPH_CAP_FILE_SHARED) &&
 760             (issued & CEPH_CAP_FILE_EXCL) == 0 &&
 761             !__ceph_dir_is_complete(ci)) {
 762                 dout(" marking %p complete (empty)\n", inode);
 763                 __ceph_dir_set_complete(ci, atomic_read(&ci->i_release_count));
 764         }
 765         spin_unlock(&ci->i_ceph_lock);
 766
 767         /* queue truncate if we saw i_size decrease */
 768         if (queue_trunc)
 769                 ceph_queue_vmtruncate(inode);
 770
 771         /* populate frag tree */
 772         /* FIXME: move me up, if/when version reflects fragtree changes */
 773         nsplits = le32_to_cpu(info->fragtree.nsplits);
 774         mutex_lock(&ci->i_fragtree_mutex);
 775         rb_node = rb_first(&ci->i_fragtree);
 776         for (i = 0; i < nsplits; i++) {
 777                 u32 id = le32_to_cpu(info->fragtree.splits[i].frag);
 778                 frag = NULL;
 779                 while (rb_node) {
 780                         frag = rb_entry(rb_node, struct ceph_inode_frag, node);
 781                         if (ceph_frag_compare(frag->frag, id) >= 0) {
 782                                 if (frag->frag != id)
 783                                         frag = NULL;
 784                                 else
 785                                         rb_node = rb_next(rb_node);
 786                                 break;
 787                         }
 788                         rb_node = rb_next(rb_node);
 789                         rb_erase(&frag->node, &ci->i_fragtree);
 790                         kfree(frag);
 791                         frag = NULL;
 792                 }
 793                 if (!frag) {
 794                         frag = __get_or_create_frag(ci, id);
 795                         if (IS_ERR(frag))
 796                                 continue;
 797                 }
 798                 frag->split_by = le32_to_cpu(info->fragtree.splits[i].by);
 799                 dout(" frag %x split by %d\n", frag->frag, frag->split_by);
 800         }
 801         while (rb_node) {
 802                 frag = rb_entry(rb_node, struct ceph_inode_frag, node);
 803                 rb_node = rb_next(rb_node);
 804                 rb_erase(&frag->node, &ci->i_fragtree);
 805                 kfree(frag);
 806         }
 807         mutex_unlock(&ci->i_fragtree_mutex);
 808
 809         /* were we issued a capability? */
 810         if (info->cap.caps) {
 811                 if (ceph_snap(inode) == CEPH_NOSNAP) {
 812                         ceph_add_cap(inode, session,
 813                                      le64_to_cpu(info->cap.cap_id),
 814                                      cap_fmode,
 815                                      le32_to_cpu(info->cap.caps),
 816                                      le32_to_cpu(info->cap.wanted),
 817                                      le32_to_cpu(info->cap.seq),
 818                                      le32_to_cpu(info->cap.mseq),
 819                                      le64_to_cpu(info->cap.realm),
 820                                      info->cap.flags,
 821                                      caps_reservation);
 822                 } else {
 823                         spin_lock(&ci->i_ceph_lock);
 824                         dout(" %p got snap_caps %s\n", inode,
 825                              ceph_cap_string(le32_to_cpu(info->cap.caps)));
 826                         ci->i_snap_caps |= le32_to_cpu(info->cap.caps);
 827                         if (cap_fmode >= 0)
 828                                 __ceph_get_fmode(ci, cap_fmode);
 829                         spin_unlock(&ci->i_ceph_lock);
 830                 }
 831         } else if (cap_fmode >= 0) {
 832                 pr_warning("mds issued no caps on %llx.%llx\n",
 833                            ceph_vinop(inode));
 834                 __ceph_get_fmode(ci, cap_fmode);
 835         }
 836
 837         /* update delegation info? */
 838         if (dirinfo)
 839                 ceph_fill_dirfrag(inode, dirinfo);
 840
 841         err = 0;
 842
 843 out:
 844         if (xattr_blob)
 845                 ceph_buffer_put(xattr_blob);
 846         return err;
 847 }
 848
 849 /*
 850  * caller should hold session s_mutex.
 851  */
 852 static void update_dentry_lease(struct dentry *dentry,
 853                                 struct ceph_mds_reply_lease *lease,
 854                                 struct ceph_mds_session *session,
 855                                 unsigned long from_time)
 856 {
 857         struct ceph_dentry_info *di = ceph_dentry(dentry);
 858         long unsigned duration = le32_to_cpu(lease->duration_ms);
 859         long unsigned ttl = from_time + (duration * HZ) / 1000;
 860         long unsigned half_ttl = from_time + (duration * HZ / 2) / 1000;
 861         struct inode *dir;
 862
 863         /* only track leases on regular dentries */
 864         if (dentry->d_op != &ceph_dentry_ops)
 865                 return;
 866
 867         spin_lock(&dentry->d_lock);
 868         dout("update_dentry_lease %p duration %lu ms ttl %lu\n",
 869              dentry, duration, ttl);
 870
 871         /* make lease_rdcache_gen match directory */
 872         dir = dentry->d_parent->d_inode;
 873         di->lease_shared_gen = ceph_inode(dir)->i_shared_gen;
 874
 875         if (duration == 0)
 876                 goto out_unlock;
 877
 878         if (di->lease_gen == session->s_cap_gen &&
 879             time_before(ttl, dentry->d_time))
 880                 goto out_unlock;  /* we already have a newer lease. */
 881
 882         if (di->lease_session && di->lease_session != session)
 883                 goto out_unlock;
 884
 885         ceph_dentry_lru_touch(dentry);
 886
 887         if (!di->lease_session)
 888                 di->lease_session = ceph_get_mds_session(session);
 889         di->lease_gen = session->s_cap_gen;
 890         di->lease_seq = le32_to_cpu(lease->seq);
 891         di->lease_renew_after = half_ttl;
 892         di->lease_renew_from = 0;
 893         dentry->d_time = ttl;
 894 out_unlock:
 895         spin_unlock(&dentry->d_lock);
 896         return;
 897 }
 898
 899 /*
 900  * splice a dentry to an inode.
 901  * caller must hold directory i_mutex for this to be safe.
 902  *
 903  * we will only rehash the resulting dentry if @prehash is
 904  * true; @prehash will be set to false (for the benefit of
 905  * the caller) if we fail.
 906  */
 907 static struct dentry *splice_dentry(struct dentry *dn, struct inode *in,
 908                                     bool *prehash)
 909 {
 910         struct dentry *realdn;
 911
 912         BUG_ON(dn->d_inode);
 913
 914         /* dn must be unhashed */
 915         if (!d_unhashed(dn))
 916                 d_drop(dn);
 917         realdn = d_materialise_unique(dn, in);
 918         if (IS_ERR(realdn)) {
 919                 pr_err("splice_dentry error %ld %p inode %p ino %llx.%llx\n",
 920                        PTR_ERR(realdn), dn, in, ceph_vinop(in));
 921                 if (prehash)
 922                         *prehash = false; /* don't rehash on error */
 923                 dn = realdn; /* note realdn contains the error */
 924                 goto out;
 925         } else if (realdn) {
 926                 dout("dn %p (%d) spliced with %p (%d) "
 927                      "inode %p ino %llx.%llx\n",
 928                      dn, d_count(dn),
 929                      realdn, d_count(realdn),
 930                      realdn->d_inode, ceph_vinop(realdn->d_inode));
 931                 dput(dn);
 932                 dn = realdn;
 933         } else {
 934                 BUG_ON(!ceph_dentry(dn));
 935                 dout("dn %p attached to %p ino %llx.%llx\n",
 936                      dn, dn->d_inode, ceph_vinop(dn->d_inode));
 937         }
 938         if ((!prehash || *prehash) && d_unhashed(dn))
 939                 d_rehash(dn);
 940 out:
 941         return dn;
 942 }
 943
 944 /*
 945  * Incorporate results into the local cache.  This is either just
 946  * one inode, or a directory, dentry, and possibly linked-to inode (e.g.,
 947  * after a lookup).
 948  *
 949  * A reply may contain
 950  *         a directory inode along with a dentry.
 951  *  and/or a target inode
 952  *
 953  * Called with snap_rwsem (read).
 954  */
 955 int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req,
 956                     struct ceph_mds_session *session)
 957 {
 958         struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
 959         struct inode *in = NULL;
 960         struct ceph_vino vino;
 961         struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
 962         int err = 0;
 963
 964         dout("fill_trace %p is_dentry %d is_target %d\n", req,
 965              rinfo->head->is_dentry, rinfo->head->is_target);
 966
 967 #if 0
 968         /*
 969          * Debugging hook:
 970          *
 971          * If we resend completed ops to a recovering mds, we get no
 972          * trace.  Since that is very rare, pretend this is the case
 973          * to ensure the 'no trace' handlers in the callers behave.
 974          *
 975          * Fill in inodes unconditionally to avoid breaking cap
 976          * invariants.
 977          */
 978         if (rinfo->head->op & CEPH_MDS_OP_WRITE) {
 979                 pr_info("fill_trace faking empty trace on %lld %s\n",
 980                         req->r_tid, ceph_mds_op_name(rinfo->head->op));
 981                 if (rinfo->head->is_dentry) {
 982                         rinfo->head->is_dentry = 0;
 983                         err = fill_inode(req->r_locked_dir,
 984                                          &rinfo->diri, rinfo->dirfrag,
 985                                          session, req->r_request_started, -1);
 986                 }
 987                 if (rinfo->head->is_target) {
 988                         rinfo->head->is_target = 0;
 989                         ininfo = rinfo->targeti.in;
 990                         vino.ino = le64_to_cpu(ininfo->ino);
 991                         vino.snap = le64_to_cpu(ininfo->snapid);
 992                         in = ceph_get_inode(sb, vino);
 993                         err = fill_inode(in, &rinfo->targeti, NULL,
 994                                          session, req->r_request_started,
 995                                          req->r_fmode);
 996                         iput(in);
 997                 }
 998         }
 999 #endif
1000
1001         if (!rinfo->head->is_target && !rinfo->head->is_dentry) {
1002                 dout("fill_trace reply is empty!\n");
1003                 if (rinfo->head->result == 0 && req->r_locked_dir)
1004                         ceph_invalidate_dir_request(req);
1005                 return 0;
1006         }
1007
1008         if (rinfo->head->is_dentry) {
1009                 struct inode *dir = req->r_locked_dir;
1010
1011                 if (dir) {
1012                         err = fill_inode(dir, &rinfo->diri, rinfo->dirfrag,
1013                                          session, req->r_request_started, -1,
1014                                          &req->r_caps_reservation);
1015                         if (err < 0)
1016                                 goto done;
1017                 } else {
1018                         WARN_ON_ONCE(1);
1019                 }
1020
1021                 if (dir && req->r_op == CEPH_MDS_OP_LOOKUPNAME) {
1022                         struct qstr dname;
1023                         struct dentry *dn, *parent;
1024
1025                         BUG_ON(!rinfo->head->is_target);
1026                         BUG_ON(req->r_dentry);
1027
1028                         parent = d_find_any_alias(dir);
1029                         BUG_ON(!parent);
1030
1031                         dname.name = rinfo->dname;
1032                         dname.len = rinfo->dname_len;
1033                         dname.hash = full_name_hash(dname.name, dname.len);
1034                         vino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1035                         vino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1036 retry_lookup:
1037                         dn = d_lookup(parent, &dname);
1038                         dout("d_lookup on parent=%p name=%.*s got %p\n",
1039                              parent, dname.len, dname.name, dn);
1040
1041                         if (!dn) {
1042                                 dn = d_alloc(parent, &dname);
1043                                 dout("d_alloc %p '%.*s' = %p\n", parent,
1044                                      dname.len, dname.name, dn);
1045                                 if (dn == NULL) {
1046                                         dput(parent);
1047                                         err = -ENOMEM;
1048                                         goto done;
1049                                 }
1050                                 err = ceph_init_dentry(dn);
1051                                 if (err < 0) {
1052                                         dput(dn);
1053                                         dput(parent);
1054                                         goto done;
1055                                 }
1056                         } else if (dn->d_inode &&
1057                                    (ceph_ino(dn->d_inode) != vino.ino ||
1058                                     ceph_snap(dn->d_inode) != vino.snap)) {
1059                                 dout(" dn %p points to wrong inode %p\n",
1060                                      dn, dn->d_inode);
1061                                 d_delete(dn);
1062                                 dput(dn);
1063                                 goto retry_lookup;
1064                         }
1065
1066                         req->r_dentry = dn;
1067                         dput(parent);
1068                 }
1069         }
1070
1071         if (rinfo->head->is_target) {
1072                 vino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1073                 vino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1074
1075                 in = ceph_get_inode(sb, vino);
1076                 if (IS_ERR(in)) {
1077                         err = PTR_ERR(in);
1078                         goto done;
1079                 }
1080                 req->r_target_inode = in;
1081
1082                 err = fill_inode(in, &rinfo->targeti, NULL,
1083                                 session, req->r_request_started,
1084                                 (!req->r_aborted && rinfo->head->result == 0) ?
1085                                 req->r_fmode : -1,
1086                                 &req->r_caps_reservation);
1087                 if (err < 0) {
1088                         pr_err("fill_inode badness %p %llx.%llx\n",
1089                                 in, ceph_vinop(in));
1090                         goto done;
1091                 }
1092         }
1093
1094         /*
1095          * ignore null lease/binding on snapdir ENOENT, or else we
1096          * will have trouble splicing in the virtual snapdir later
1097          */
1098         if (rinfo->head->is_dentry && !req->r_aborted &&
1099             req->r_locked_dir &&
1100             (rinfo->head->is_target || strncmp(req->r_dentry->d_name.name,
1101                                                fsc->mount_options->snapdir_name,
1102                                                req->r_dentry->d_name.len))) {
1103                 /*
1104                  * lookup link rename   : null -> possibly existing inode
1105                  * mknod symlink mkdir  : null -> new inode
1106                  * unlink               : linked -> null
1107                  */
1108                 struct inode *dir = req->r_locked_dir;
1109                 struct dentry *dn = req->r_dentry;
1110                 bool have_dir_cap, have_lease;
1111
1112                 BUG_ON(!dn);
1113                 BUG_ON(!dir);
1114                 BUG_ON(dn->d_parent->d_inode != dir);
1115                 BUG_ON(ceph_ino(dir) !=
1116                        le64_to_cpu(rinfo->diri.in->ino));
1117                 BUG_ON(ceph_snap(dir) !=
1118                        le64_to_cpu(rinfo->diri.in->snapid));
1119
1120                 /* do we have a lease on the whole dir? */
1121                 have_dir_cap =
1122                         (le32_to_cpu(rinfo->diri.in->cap.caps) &
1123                          CEPH_CAP_FILE_SHARED);
1124
1125                 /* do we have a dn lease? */
1126                 have_lease = have_dir_cap ||
1127                         le32_to_cpu(rinfo->dlease->duration_ms);
1128                 if (!have_lease)
1129                         dout("fill_trace  no dentry lease or dir cap\n");
1130
1131                 /* rename? */
1132                 if (req->r_old_dentry && req->r_op == CEPH_MDS_OP_RENAME) {
1133                         struct inode *olddir = req->r_old_dentry_dir;
1134                         BUG_ON(!olddir);
1135
1136                         dout(" src %p '%.*s' dst %p '%.*s'\n",
1137                              req->r_old_dentry,
1138                              req->r_old_dentry->d_name.len,
1139                              req->r_old_dentry->d_name.name,
1140                              dn, dn->d_name.len, dn->d_name.name);
1141                         dout("fill_trace doing d_move %p -> %p\n",
1142                              req->r_old_dentry, dn);
1143
1144                         d_move(req->r_old_dentry, dn);
1145                         dout(" src %p '%.*s' dst %p '%.*s'\n",
1146                              req->r_old_dentry,
1147                              req->r_old_dentry->d_name.len,
1148                              req->r_old_dentry->d_name.name,
1149                              dn, dn->d_name.len, dn->d_name.name);
1150
1151                         /* ensure target dentry is invalidated, despite
1152                            rehashing bug in vfs_rename_dir */
1153                         ceph_invalidate_dentry_lease(dn);
1154
1155                         /* d_move screws up sibling dentries' offsets */
1156                         ceph_dir_clear_complete(dir);
1157                         ceph_dir_clear_complete(olddir);
1158
1159                         dout("dn %p gets new offset %lld\n", req->r_old_dentry,
1160                              ceph_dentry(req->r_old_dentry)->offset);
1161
1162                         dn = req->r_old_dentry;  /* use old_dentry */
1163                 }
1164
1165                 /* null dentry? */
1166                 if (!rinfo->head->is_target) {
1167                         dout("fill_trace null dentry\n");
1168                         if (dn->d_inode) {
1169                                 dout("d_delete %p\n", dn);
1170                                 d_delete(dn);
1171                         } else {
1172                                 dout("d_instantiate %p NULL\n", dn);
1173                                 d_instantiate(dn, NULL);
1174                                 if (have_lease && d_unhashed(dn))
1175                                         d_rehash(dn);
1176                                 update_dentry_lease(dn, rinfo->dlease,
1177                                                     session,
1178                                                     req->r_request_started);
1179                         }
1180                         goto done;
1181                 }
1182
1183                 /* attach proper inode */
1184                 if (!dn->d_inode) {
1185                         ceph_dir_clear_complete(dir);
1186                         ihold(in);
1187                         dn = splice_dentry(dn, in, &have_lease);
1188                         if (IS_ERR(dn)) {
1189                                 err = PTR_ERR(dn);
1190                                 goto done;
1191                         }
1192                         req->r_dentry = dn;  /* may have spliced */
1193                 } else if (dn->d_inode && dn->d_inode != in) {
1194                         dout(" %p links to %p %llx.%llx, not %llx.%llx\n",
1195                              dn, dn->d_inode, ceph_vinop(dn->d_inode),
1196                              ceph_vinop(in));
1197                         have_lease = false;
1198                 }
1199
1200                 if (have_lease)
1201                         update_dentry_lease(dn, rinfo->dlease, session,
1202                                             req->r_request_started);
1203                 dout(" final dn %p\n", dn);
1204         } else if (!req->r_aborted &&
1205                    (req->r_op == CEPH_MDS_OP_LOOKUPSNAP ||
1206                     req->r_op == CEPH_MDS_OP_MKSNAP)) {
1207                 struct dentry *dn = req->r_dentry;
1208                 struct inode *dir = req->r_locked_dir;
1209
1210                 /* fill out a snapdir LOOKUPSNAP dentry */
1211                 BUG_ON(!dn);
1212                 BUG_ON(!dir);
1213                 BUG_ON(ceph_snap(dir) != CEPH_SNAPDIR);
1214                 dout(" linking snapped dir %p to dn %p\n", in, dn);
1215                 ceph_dir_clear_complete(dir);
1216                 ihold(in);
1217                 dn = splice_dentry(dn, in, NULL);
1218                 if (IS_ERR(dn)) {
1219                         err = PTR_ERR(dn);
1220                         goto done;
1221                 }
1222                 req->r_dentry = dn;  /* may have spliced */
1223         }
1224 done:
1225         dout("fill_trace done err=%d\n", err);
1226         return err;
1227 }
1228
1229 /*
1230  * Prepopulate our cache with readdir results, leases, etc.
1231  */
1232 static int readdir_prepopulate_inodes_only(struct ceph_mds_request *req,
1233                                            struct ceph_mds_session *session)
1234 {
1235         struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1236         int i, err = 0;
1237
1238         for (i = 0; i < rinfo->dir_nr; i++) {
1239                 struct ceph_vino vino;
1240                 struct inode *in;
1241                 int rc;
1242
1243                 vino.ino = le64_to_cpu(rinfo->dir_in[i].in->ino);
1244                 vino.snap = le64_to_cpu(rinfo->dir_in[i].in->snapid);
1245
1246                 in = ceph_get_inode(req->r_dentry->d_sb, vino);
1247                 if (IS_ERR(in)) {
1248                         err = PTR_ERR(in);
1249                         dout("new_inode badness got %d\n", err);
1250                         continue;
1251                 }
1252                 rc = fill_inode(in, &rinfo->dir_in[i], NULL, session,
1253                                 req->r_request_started, -1,
1254                                 &req->r_caps_reservation);
1255                 if (rc < 0) {
1256                         pr_err("fill_inode badness on %p got %d\n", in, rc);
1257                         err = rc;
1258                         continue;
1259                 }
1260         }
1261
1262         return err;
1263 }
1264
1265 int ceph_readdir_prepopulate(struct ceph_mds_request *req,
1266                              struct ceph_mds_session *session)
1267 {
1268         struct dentry *parent = req->r_dentry;
1269         struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1270         struct qstr dname;
1271         struct dentry *dn;
1272         struct inode *in;
1273         int err = 0, ret, i;
1274         struct inode *snapdir = NULL;
1275         struct ceph_mds_request_head *rhead = req->r_request->front.iov_base;
1276         struct ceph_dentry_info *di;
1277         u64 r_readdir_offset = req->r_readdir_offset;
1278         u32 frag = le32_to_cpu(rhead->args.readdir.frag);
1279
1280         if (rinfo->dir_dir &&
1281             le32_to_cpu(rinfo->dir_dir->frag) != frag) {
1282                 dout("readdir_prepopulate got new frag %x -> %x\n",
1283                      frag, le32_to_cpu(rinfo->dir_dir->frag));
1284                 frag = le32_to_cpu(rinfo->dir_dir->frag);
1285                 if (ceph_frag_is_leftmost(frag))
1286                         r_readdir_offset = 2;
1287                 else
1288                         r_readdir_offset = 0;
1289         }
1290
1291         if (req->r_aborted)
1292                 return readdir_prepopulate_inodes_only(req, session);
1293
1294         if (le32_to_cpu(rinfo->head->op) == CEPH_MDS_OP_LSSNAP) {
1295                 snapdir = ceph_get_snapdir(parent->d_inode);
1296                 parent = d_find_alias(snapdir);
1297                 dout("readdir_prepopulate %d items under SNAPDIR dn %p\n",
1298                      rinfo->dir_nr, parent);
1299         } else {
1300                 dout("readdir_prepopulate %d items under dn %p\n",
1301                      rinfo->dir_nr, parent);
1302                 if (rinfo->dir_dir)
1303                         ceph_fill_dirfrag(parent->d_inode, rinfo->dir_dir);
1304         }
1305
1306         /* FIXME: release caps/leases if error occurs */
1307         for (i = 0; i < rinfo->dir_nr; i++) {
1308                 struct ceph_vino vino;
1309
1310                 dname.name = rinfo->dir_dname[i];
1311                 dname.len = rinfo->dir_dname_len[i];
1312                 dname.hash = full_name_hash(dname.name, dname.len);
1313
1314                 vino.ino = le64_to_cpu(rinfo->dir_in[i].in->ino);
1315                 vino.snap = le64_to_cpu(rinfo->dir_in[i].in->snapid);
1316
1317 retry_lookup:
1318                 dn = d_lookup(parent, &dname);
1319                 dout("d_lookup on parent=%p name=%.*s got %p\n",
1320                      parent, dname.len, dname.name, dn);
1321
1322                 if (!dn) {
1323                         dn = d_alloc(parent, &dname);
1324                         dout("d_alloc %p '%.*s' = %p\n", parent,
1325                              dname.len, dname.name, dn);
1326                         if (dn == NULL) {
1327                                 dout("d_alloc badness\n");
1328                                 err = -ENOMEM;
1329                                 goto out;
1330                         }
1331                         ret = ceph_init_dentry(dn);
1332                         if (ret < 0) {
1333                                 dput(dn);
1334                                 err = ret;
1335                                 goto out;
1336                         }
1337                 } else if (dn->d_inode &&
1338                            (ceph_ino(dn->d_inode) != vino.ino ||
1339                             ceph_snap(dn->d_inode) != vino.snap)) {
1340                         dout(" dn %p points to wrong inode %p\n",
1341                              dn, dn->d_inode);
1342                         d_delete(dn);
1343                         dput(dn);
1344                         goto retry_lookup;
1345                 } else {
1346                         /* reorder parent's d_subdirs */
1347                         spin_lock(&parent->d_lock);
1348                         spin_lock_nested(&dn->d_lock, DENTRY_D_LOCK_NESTED);
1349                         list_move(&dn->d_u.d_child, &parent->d_subdirs);
1350                         spin_unlock(&dn->d_lock);
1351                         spin_unlock(&parent->d_lock);
1352                 }
1353
1354                 /* inode */
1355                 if (dn->d_inode) {
1356                         in = dn->d_inode;
1357                 } else {
1358                         in = ceph_get_inode(parent->d_sb, vino);
1359                         if (IS_ERR(in)) {
1360                                 dout("new_inode badness\n");
1361                                 d_drop(dn);
1362                                 dput(dn);
1363                                 err = PTR_ERR(in);
1364                                 goto out;
1365                         }
1366                 }
1367
1368                 if (fill_inode(in, &rinfo->dir_in[i], NULL, session,
1369                                req->r_request_started, -1,
1370                                &req->r_caps_reservation) < 0) {
1371                         pr_err("fill_inode badness on %p\n", in);
1372                         if (!dn->d_inode)
1373                                 iput(in);
1374                         d_drop(dn);
1375                         goto next_item;
1376                 }
1377
1378                 if (!dn->d_inode) {
1379                         dn = splice_dentry(dn, in, NULL);
1380                         if (IS_ERR(dn)) {
1381                                 err = PTR_ERR(dn);
1382                                 dn = NULL;
1383                                 goto next_item;
1384                         }
1385                 }
1386
1387                 di = dn->d_fsdata;
1388                 di->offset = ceph_make_fpos(frag, i + r_readdir_offset);
1389
1390                 update_dentry_lease(dn, rinfo->dir_dlease[i],
1391                                     req->r_session,
1392                                     req->r_request_started);
1393 next_item:
1394                 if (dn)
1395                         dput(dn);
1396         }
1397         if (err == 0)
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                 if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE))
1488                         check = 1;
1489                 spin_unlock(&ci->i_ceph_lock);
1490                 mutex_unlock(&ci->i_truncate_mutex);
1491                 goto out;
1492         }
1493         orig_gen = ci->i_rdcache_gen;
1494         spin_unlock(&ci->i_ceph_lock);
1495
1496         truncate_inode_pages(inode->i_mapping, 0);
1497
1498         spin_lock(&ci->i_ceph_lock);
1499         if (orig_gen == ci->i_rdcache_gen &&
1500             orig_gen == ci->i_rdcache_revoking) {
1501                 dout("invalidate_pages %p gen %d successful\n", inode,
1502                      ci->i_rdcache_gen);
1503                 ci->i_rdcache_revoking--;
1504                 check = 1;
1505         } else {
1506                 dout("invalidate_pages %p gen %d raced, now %d revoking %d\n",
1507                      inode, orig_gen, ci->i_rdcache_gen,
1508                      ci->i_rdcache_revoking);
1509                 if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE))
1510                         check = 1;
1511         }
1512         spin_unlock(&ci->i_ceph_lock);
1513         mutex_unlock(&ci->i_truncate_mutex);
1514 out:
1515         if (check)
1516                 ceph_check_caps(ci, 0, NULL);
1517         iput(inode);
1518 }
1519
1520
1521 /*
1522  * called by trunc_wq;
1523  *
1524  * We also truncate in a separate thread as well.
1525  */
1526 static void ceph_vmtruncate_work(struct work_struct *work)
1527 {
1528         struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1529                                                   i_vmtruncate_work);
1530         struct inode *inode = &ci->vfs_inode;
1531
1532         dout("vmtruncate_work %p\n", inode);
1533         __ceph_do_pending_vmtruncate(inode);
1534         iput(inode);
1535 }
1536
1537 /*
1538  * Queue an async vmtruncate.  If we fail to queue work, we will handle
1539  * the truncation the next time we call __ceph_do_pending_vmtruncate.
1540  */
1541 void ceph_queue_vmtruncate(struct inode *inode)
1542 {
1543         struct ceph_inode_info *ci = ceph_inode(inode);
1544
1545         ihold(inode);
1546
1547         if (queue_work(ceph_sb_to_client(inode->i_sb)->trunc_wq,
1548                        &ci->i_vmtruncate_work)) {
1549                 dout("ceph_queue_vmtruncate %p\n", inode);
1550         } else {
1551                 dout("ceph_queue_vmtruncate %p failed, pending=%d\n",
1552                      inode, ci->i_truncate_pending);
1553                 iput(inode);
1554         }
1555 }
1556
1557 /*
1558  * Make sure any pending truncation is applied before doing anything
1559  * that may depend on it.
1560  */
1561 void __ceph_do_pending_vmtruncate(struct inode *inode)
1562 {
1563         struct ceph_inode_info *ci = ceph_inode(inode);
1564         u64 to;
1565         int wrbuffer_refs, finish = 0;
1566
1567         mutex_lock(&ci->i_truncate_mutex);
1568 retry:
1569         spin_lock(&ci->i_ceph_lock);
1570         if (ci->i_truncate_pending == 0) {
1571                 dout("__do_pending_vmtruncate %p none pending\n", inode);
1572                 spin_unlock(&ci->i_ceph_lock);
1573                 mutex_unlock(&ci->i_truncate_mutex);
1574                 return;
1575         }
1576
1577         /*
1578          * make sure any dirty snapped pages are flushed before we
1579          * possibly truncate them.. so write AND block!
1580          */
1581         if (ci->i_wrbuffer_ref_head < ci->i_wrbuffer_ref) {
1582                 dout("__do_pending_vmtruncate %p flushing snaps first\n",
1583                      inode);
1584                 spin_unlock(&ci->i_ceph_lock);
1585                 filemap_write_and_wait_range(&inode->i_data, 0,
1586                                              inode->i_sb->s_maxbytes);
1587                 goto retry;
1588         }
1589
1590         /* there should be no reader or writer */
1591         WARN_ON_ONCE(ci->i_rd_ref || ci->i_wr_ref);
1592
1593         to = ci->i_truncate_size;
1594         wrbuffer_refs = ci->i_wrbuffer_ref;
1595         dout("__do_pending_vmtruncate %p (%d) to %lld\n", inode,
1596              ci->i_truncate_pending, to);
1597         spin_unlock(&ci->i_ceph_lock);
1598
1599         truncate_inode_pages(inode->i_mapping, to);
1600
1601         spin_lock(&ci->i_ceph_lock);
1602         if (to == ci->i_truncate_size) {
1603                 ci->i_truncate_pending = 0;
1604                 finish = 1;
1605         }
1606         spin_unlock(&ci->i_ceph_lock);
1607         if (!finish)
1608                 goto retry;
1609
1610         mutex_unlock(&ci->i_truncate_mutex);
1611
1612         if (wrbuffer_refs == 0)
1613                 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
1614
1615         wake_up_all(&ci->i_cap_wq);
1616 }
1617
1618 /*
1619  * symlinks
1620  */
1621 static void *ceph_sym_follow_link(struct dentry *dentry, struct nameidata *nd)
1622 {
1623         struct ceph_inode_info *ci = ceph_inode(dentry->d_inode);
1624         nd_set_link(nd, ci->i_symlink);
1625         return NULL;
1626 }
1627
1628 static const struct inode_operations ceph_symlink_iops = {
1629         .readlink = generic_readlink,
1630         .follow_link = ceph_sym_follow_link,
1631         .setattr = ceph_setattr,
1632         .getattr = ceph_getattr,
1633         .setxattr = ceph_setxattr,
1634         .getxattr = ceph_getxattr,
1635         .listxattr = ceph_listxattr,
1636         .removexattr = ceph_removexattr,
1637 };
1638
1639 /*
1640  * setattr
1641  */
1642 int ceph_setattr(struct dentry *dentry, struct iattr *attr)
1643 {
1644         struct inode *inode = dentry->d_inode;
1645         struct ceph_inode_info *ci = ceph_inode(inode);
1646         const unsigned int ia_valid = attr->ia_valid;
1647         struct ceph_mds_request *req;
1648         struct ceph_mds_client *mdsc = ceph_sb_to_client(dentry->d_sb)->mdsc;
1649         int issued;
1650         int release = 0, dirtied = 0;
1651         int mask = 0;
1652         int err = 0;
1653         int inode_dirty_flags = 0;
1654
1655         if (ceph_snap(inode) != CEPH_NOSNAP)
1656                 return -EROFS;
1657
1658         err = inode_change_ok(inode, attr);
1659         if (err != 0)
1660                 return err;
1661
1662         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETATTR,
1663                                        USE_AUTH_MDS);
1664         if (IS_ERR(req))
1665                 return PTR_ERR(req);
1666
1667         spin_lock(&ci->i_ceph_lock);
1668         issued = __ceph_caps_issued(ci, NULL);
1669         dout("setattr %p issued %s\n", inode, ceph_cap_string(issued));
1670
1671         if (ia_valid & ATTR_UID) {
1672                 dout("setattr %p uid %d -> %d\n", inode,
1673                      from_kuid(&init_user_ns, inode->i_uid),
1674                      from_kuid(&init_user_ns, attr->ia_uid));
1675                 if (issued & CEPH_CAP_AUTH_EXCL) {
1676                         inode->i_uid = attr->ia_uid;
1677                         dirtied |= CEPH_CAP_AUTH_EXCL;
1678                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1679                            !uid_eq(attr->ia_uid, inode->i_uid)) {
1680                         req->r_args.setattr.uid = cpu_to_le32(
1681                                 from_kuid(&init_user_ns, attr->ia_uid));
1682                         mask |= CEPH_SETATTR_UID;
1683                         release |= CEPH_CAP_AUTH_SHARED;
1684                 }
1685         }
1686         if (ia_valid & ATTR_GID) {
1687                 dout("setattr %p gid %d -> %d\n", inode,
1688                      from_kgid(&init_user_ns, inode->i_gid),
1689                      from_kgid(&init_user_ns, attr->ia_gid));
1690                 if (issued & CEPH_CAP_AUTH_EXCL) {
1691                         inode->i_gid = attr->ia_gid;
1692                         dirtied |= CEPH_CAP_AUTH_EXCL;
1693                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1694                            !gid_eq(attr->ia_gid, inode->i_gid)) {
1695                         req->r_args.setattr.gid = cpu_to_le32(
1696                                 from_kgid(&init_user_ns, attr->ia_gid));
1697                         mask |= CEPH_SETATTR_GID;
1698                         release |= CEPH_CAP_AUTH_SHARED;
1699                 }
1700         }
1701         if (ia_valid & ATTR_MODE) {
1702                 dout("setattr %p mode 0%o -> 0%o\n", inode, inode->i_mode,
1703                      attr->ia_mode);
1704                 if (issued & CEPH_CAP_AUTH_EXCL) {
1705                         inode->i_mode = attr->ia_mode;
1706                         dirtied |= CEPH_CAP_AUTH_EXCL;
1707                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1708                            attr->ia_mode != inode->i_mode) {
1709                         inode->i_mode = attr->ia_mode;
1710                         req->r_args.setattr.mode = cpu_to_le32(attr->ia_mode);
1711                         mask |= CEPH_SETATTR_MODE;
1712                         release |= CEPH_CAP_AUTH_SHARED;
1713                 }
1714         }
1715
1716         if (ia_valid & ATTR_ATIME) {
1717                 dout("setattr %p atime %ld.%ld -> %ld.%ld\n", inode,
1718                      inode->i_atime.tv_sec, inode->i_atime.tv_nsec,
1719                      attr->ia_atime.tv_sec, attr->ia_atime.tv_nsec);
1720                 if (issued & CEPH_CAP_FILE_EXCL) {
1721                         ci->i_time_warp_seq++;
1722                         inode->i_atime = attr->ia_atime;
1723                         dirtied |= CEPH_CAP_FILE_EXCL;
1724                 } else if ((issued & CEPH_CAP_FILE_WR) &&
1725                            timespec_compare(&inode->i_atime,
1726                                             &attr->ia_atime) < 0) {
1727                         inode->i_atime = attr->ia_atime;
1728                         dirtied |= CEPH_CAP_FILE_WR;
1729                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1730                            !timespec_equal(&inode->i_atime, &attr->ia_atime)) {
1731                         ceph_encode_timespec(&req->r_args.setattr.atime,
1732                                              &attr->ia_atime);
1733                         mask |= CEPH_SETATTR_ATIME;
1734                         release |= CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_RD |
1735                                 CEPH_CAP_FILE_WR;
1736                 }
1737         }
1738         if (ia_valid & ATTR_MTIME) {
1739                 dout("setattr %p mtime %ld.%ld -> %ld.%ld\n", inode,
1740                      inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
1741                      attr->ia_mtime.tv_sec, attr->ia_mtime.tv_nsec);
1742                 if (issued & CEPH_CAP_FILE_EXCL) {
1743                         ci->i_time_warp_seq++;
1744                         inode->i_mtime = attr->ia_mtime;
1745                         dirtied |= CEPH_CAP_FILE_EXCL;
1746                 } else if ((issued & CEPH_CAP_FILE_WR) &&
1747                            timespec_compare(&inode->i_mtime,
1748                                             &attr->ia_mtime) < 0) {
1749                         inode->i_mtime = attr->ia_mtime;
1750                         dirtied |= CEPH_CAP_FILE_WR;
1751                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1752                            !timespec_equal(&inode->i_mtime, &attr->ia_mtime)) {
1753                         ceph_encode_timespec(&req->r_args.setattr.mtime,
1754                                              &attr->ia_mtime);
1755                         mask |= CEPH_SETATTR_MTIME;
1756                         release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD |
1757                                 CEPH_CAP_FILE_WR;
1758                 }
1759         }
1760         if (ia_valid & ATTR_SIZE) {
1761                 dout("setattr %p size %lld -> %lld\n", inode,
1762                      inode->i_size, attr->ia_size);
1763                 if (attr->ia_size > inode->i_sb->s_maxbytes) {
1764                         err = -EINVAL;
1765                         goto out;
1766                 }
1767                 if ((issued & CEPH_CAP_FILE_EXCL) &&
1768                     attr->ia_size > inode->i_size) {
1769                         inode->i_size = attr->ia_size;
1770                         inode->i_blocks =
1771                                 (attr->ia_size + (1 << 9) - 1) >> 9;
1772                         inode->i_ctime = attr->ia_ctime;
1773                         ci->i_reported_size = attr->ia_size;
1774                         dirtied |= CEPH_CAP_FILE_EXCL;
1775                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1776                            attr->ia_size != inode->i_size) {
1777                         req->r_args.setattr.size = cpu_to_le64(attr->ia_size);
1778                         req->r_args.setattr.old_size =
1779                                 cpu_to_le64(inode->i_size);
1780                         mask |= CEPH_SETATTR_SIZE;
1781                         release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD |
1782                                 CEPH_CAP_FILE_WR;
1783                 }
1784         }
1785
1786         /* these do nothing */
1787         if (ia_valid & ATTR_CTIME) {
1788                 bool only = (ia_valid & (ATTR_SIZE|ATTR_MTIME|ATTR_ATIME|
1789                                          ATTR_MODE|ATTR_UID|ATTR_GID)) == 0;
1790                 dout("setattr %p ctime %ld.%ld -> %ld.%ld (%s)\n", inode,
1791                      inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
1792                      attr->ia_ctime.tv_sec, attr->ia_ctime.tv_nsec,
1793                      only ? "ctime only" : "ignored");
1794                 inode->i_ctime = attr->ia_ctime;
1795                 if (only) {
1796                         /*
1797                          * if kernel wants to dirty ctime but nothing else,
1798                          * we need to choose a cap to dirty under, or do
1799                          * a almost-no-op setattr
1800                          */
1801                         if (issued & CEPH_CAP_AUTH_EXCL)
1802                                 dirtied |= CEPH_CAP_AUTH_EXCL;
1803                         else if (issued & CEPH_CAP_FILE_EXCL)
1804                                 dirtied |= CEPH_CAP_FILE_EXCL;
1805                         else if (issued & CEPH_CAP_XATTR_EXCL)
1806                                 dirtied |= CEPH_CAP_XATTR_EXCL;
1807                         else
1808                                 mask |= CEPH_SETATTR_CTIME;
1809                 }
1810         }
1811         if (ia_valid & ATTR_FILE)
1812                 dout("setattr %p ATTR_FILE ... hrm!\n", inode);
1813
1814         if (dirtied) {
1815                 inode_dirty_flags = __ceph_mark_dirty_caps(ci, dirtied);
1816                 inode->i_ctime = CURRENT_TIME;
1817         }
1818
1819         release &= issued;
1820         spin_unlock(&ci->i_ceph_lock);
1821
1822         if (inode_dirty_flags)
1823                 __mark_inode_dirty(inode, inode_dirty_flags);
1824
1825         if (ia_valid & ATTR_MODE) {
1826                 err = posix_acl_chmod(inode, attr->ia_mode);
1827                 if (err)
1828                         goto out_put;
1829         }
1830
1831         if (mask) {
1832                 req->r_inode = inode;
1833                 ihold(inode);
1834                 req->r_inode_drop = release;
1835                 req->r_args.setattr.mask = cpu_to_le32(mask);
1836                 req->r_num_caps = 1;
1837                 err = ceph_mdsc_do_request(mdsc, NULL, req);
1838         }
1839         dout("setattr %p result=%d (%s locally, %d remote)\n", inode, err,
1840              ceph_cap_string(dirtied), mask);
1841
1842         ceph_mdsc_put_request(req);
1843         if (mask & CEPH_SETATTR_SIZE)
1844                 __ceph_do_pending_vmtruncate(inode);
1845         return err;
1846 out:
1847         spin_unlock(&ci->i_ceph_lock);
1848 out_put:
1849         ceph_mdsc_put_request(req);
1850         return err;
1851 }
1852
1853 /*
1854  * Verify that we have a lease on the given mask.  If not,
1855  * do a getattr against an mds.
1856  */
1857 int ceph_do_getattr(struct inode *inode, int mask)
1858 {
1859         struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
1860         struct ceph_mds_client *mdsc = fsc->mdsc;
1861         struct ceph_mds_request *req;
1862         int err;
1863
1864         if (ceph_snap(inode) == CEPH_SNAPDIR) {
1865                 dout("do_getattr inode %p SNAPDIR\n", inode);
1866                 return 0;
1867         }
1868
1869         dout("do_getattr inode %p mask %s mode 0%o\n", inode, ceph_cap_string(mask), inode->i_mode);
1870         if (ceph_caps_issued_mask(ceph_inode(inode), mask, 1))
1871                 return 0;
1872
1873         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
1874         if (IS_ERR(req))
1875                 return PTR_ERR(req);
1876         req->r_inode = inode;
1877         ihold(inode);
1878         req->r_num_caps = 1;
1879         req->r_args.getattr.mask = cpu_to_le32(mask);
1880         err = ceph_mdsc_do_request(mdsc, NULL, req);
1881         ceph_mdsc_put_request(req);
1882         dout("do_getattr result=%d\n", err);
1883         return err;
1884 }
1885
1886
1887 /*
1888  * Check inode permissions.  We verify we have a valid value for
1889  * the AUTH cap, then call the generic handler.
1890  */
1891 int ceph_permission(struct inode *inode, int mask)
1892 {
1893         int err;
1894
1895         if (mask & MAY_NOT_BLOCK)
1896                 return -ECHILD;
1897
1898         err = ceph_do_getattr(inode, CEPH_CAP_AUTH_SHARED);
1899
1900         if (!err)
1901                 err = generic_permission(inode, mask);
1902         return err;
1903 }
1904
1905 /*
1906  * Get all attributes.  Hopefully somedata we'll have a statlite()
1907  * and can limit the fields we require to be accurate.
1908  */
1909 int ceph_getattr(struct vfsmount *mnt, struct dentry *dentry,
1910                  struct kstat *stat)
1911 {
1912         struct inode *inode = dentry->d_inode;
1913         struct ceph_inode_info *ci = ceph_inode(inode);
1914         int err;
1915
1916         err = ceph_do_getattr(inode, CEPH_STAT_CAP_INODE_ALL);
1917         if (!err) {
1918                 generic_fillattr(inode, stat);
1919                 stat->ino = ceph_translate_ino(inode->i_sb, inode->i_ino);
1920                 if (ceph_snap(inode) != CEPH_NOSNAP)
1921                         stat->dev = ceph_snap(inode);
1922                 else
1923                         stat->dev = 0;
1924                 if (S_ISDIR(inode->i_mode)) {
1925                         if (ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb),
1926                                                 RBYTES))
1927                                 stat->size = ci->i_rbytes;
1928                         else
1929                                 stat->size = ci->i_files + ci->i_subdirs;
1930                         stat->blocks = 0;
1931                         stat->blksize = 65536;
1932                 }
1933         }
1934         return err;
1935 }