Pileus Git - ~andy/linux/blob - 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;
 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         int queue_trunc = 0;
 596
 597         dout("fill_inode %p ino %llx.%llx v %llu had %llu\n",
 598              inode, ceph_vinop(inode), le64_to_cpu(info->version),
 599              ci->i_version);
 600
 601         /*
 602          * prealloc xattr data, if it looks like we'll need it.  only
 603          * if len > 4 (meaning there are actually xattrs; the first 4
 604          * bytes are the xattr count).
 605          */
 606         if (iinfo->xattr_len > 4) {
 607                 xattr_blob = ceph_buffer_new(iinfo->xattr_len, GFP_NOFS);
 608                 if (!xattr_blob)
 609                         pr_err("fill_inode ENOMEM xattr blob %d bytes\n",
 610                                iinfo->xattr_len);
 611         }
 612
 613         spin_lock(&ci->i_ceph_lock);
 614
 615         /*
 616          * provided version will be odd if inode value is projected,
 617          * even if stable.  skip the update if we have newer stable
 618          * info (ours>=theirs, e.g. due to racing mds replies), unless
 619          * we are getting projected (unstable) info (in which case the
 620          * version is odd, and we want ours>theirs).
 621          *   us   them
 622          *   2    2     skip
 623          *   3    2     skip
 624          *   3    3     update
 625          */
 626         if (le64_to_cpu(info->version) > 0 &&
 627             (ci->i_version & ~1) >= le64_to_cpu(info->version))
 628                 goto no_change;
 629
 630         issued = __ceph_caps_issued(ci, &implemented);
 631         issued |= implemented | __ceph_caps_dirty(ci);
 632
 633         /* update inode */
 634         ci->i_version = le64_to_cpu(info->version);
 635         inode->i_version++;
 636         inode->i_rdev = le32_to_cpu(info->rdev);
 637
 638         if ((issued & CEPH_CAP_AUTH_EXCL) == 0) {
 639                 inode->i_mode = le32_to_cpu(info->mode);
 640                 inode->i_uid = make_kuid(&init_user_ns, le32_to_cpu(info->uid));
 641                 inode->i_gid = make_kgid(&init_user_ns, le32_to_cpu(info->gid));
 642                 dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode,
 643                      from_kuid(&init_user_ns, inode->i_uid),
 644                      from_kgid(&init_user_ns, inode->i_gid));
 645         }
 646
 647         if ((issued & CEPH_CAP_LINK_EXCL) == 0)
 648                 set_nlink(inode, le32_to_cpu(info->nlink));
 649
 650         /* be careful with mtime, atime, size */
 651         ceph_decode_timespec(&atime, &info->atime);
 652         ceph_decode_timespec(&mtime, &info->mtime);
 653         ceph_decode_timespec(&ctime, &info->ctime);
 654         queue_trunc = ceph_fill_file_size(inode, issued,
 655                                           le32_to_cpu(info->truncate_seq),
 656                                           le64_to_cpu(info->truncate_size),
 657                                           le64_to_cpu(info->size));
 658         ceph_fill_file_time(inode, issued,
 659                             le32_to_cpu(info->time_warp_seq),
 660                             &ctime, &mtime, &atime);
 661
 662         /* only update max_size on auth cap */
 663         if ((info->cap.flags & CEPH_CAP_FLAG_AUTH) &&
 664             ci->i_max_size != le64_to_cpu(info->max_size)) {
 665                 dout("max_size %lld -> %llu\n", ci->i_max_size,
 666                      le64_to_cpu(info->max_size));
 667                 ci->i_max_size = le64_to_cpu(info->max_size);
 668         }
 669
 670         ci->i_layout = info->layout;
 671         inode->i_blkbits = fls(le32_to_cpu(info->layout.fl_stripe_unit)) - 1;
 672
 673         /* xattrs */
 674         /* note that if i_xattrs.len <= 4, i_xattrs.data will still be NULL. */
 675         if ((issued & CEPH_CAP_XATTR_EXCL) == 0 &&
 676             le64_to_cpu(info->xattr_version) > ci->i_xattrs.version) {
 677                 if (ci->i_xattrs.blob)
 678                         ceph_buffer_put(ci->i_xattrs.blob);
 679                 ci->i_xattrs.blob = xattr_blob;
 680                 if (xattr_blob)
 681                         memcpy(ci->i_xattrs.blob->vec.iov_base,
 682                                iinfo->xattr_data, iinfo->xattr_len);
 683                 ci->i_xattrs.version = le64_to_cpu(info->xattr_version);
 684                 ceph_forget_all_cached_acls(inode);
 685                 xattr_blob = NULL;
 686         }
 687
 688         inode->i_mapping->a_ops = &ceph_aops;
 689         inode->i_mapping->backing_dev_info =
 690                 &ceph_sb_to_client(inode->i_sb)->backing_dev_info;
 691
 692         switch (inode->i_mode & S_IFMT) {
 693         case S_IFIFO:
 694         case S_IFBLK:
 695         case S_IFCHR:
 696         case S_IFSOCK:
 697                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
 698                 inode->i_op = &ceph_file_iops;
 699                 break;
 700         case S_IFREG:
 701                 inode->i_op = &ceph_file_iops;
 702                 inode->i_fop = &ceph_file_fops;
 703                 break;
 704         case S_IFLNK:
 705                 inode->i_op = &ceph_symlink_iops;
 706                 if (!ci->i_symlink) {
 707                         u32 symlen = iinfo->symlink_len;
 708                         char *sym;
 709
 710                         spin_unlock(&ci->i_ceph_lock);
 711
 712                         err = -EINVAL;
 713                         if (WARN_ON(symlen != inode->i_size))
 714                                 goto out;
 715
 716                         err = -ENOMEM;
 717                         sym = kstrndup(iinfo->symlink, symlen, GFP_NOFS);
 718                         if (!sym)
 719                                 goto out;
 720
 721                         spin_lock(&ci->i_ceph_lock);
 722                         if (!ci->i_symlink)
 723                                 ci->i_symlink = sym;
 724                         else
 725                                 kfree(sym); /* lost a race */
 726                 }
 727                 break;
 728         case S_IFDIR:
 729                 inode->i_op = &ceph_dir_iops;
 730                 inode->i_fop = &ceph_dir_fops;
 731
 732                 ci->i_dir_layout = iinfo->dir_layout;
 733
 734                 ci->i_files = le64_to_cpu(info->files);
 735                 ci->i_subdirs = le64_to_cpu(info->subdirs);
 736                 ci->i_rbytes = le64_to_cpu(info->rbytes);
 737                 ci->i_rfiles = le64_to_cpu(info->rfiles);
 738                 ci->i_rsubdirs = le64_to_cpu(info->rsubdirs);
 739                 ceph_decode_timespec(&ci->i_rctime, &info->rctime);
 740                 break;
 741         default:
 742                 pr_err("fill_inode %llx.%llx BAD mode 0%o\n",
 743                        ceph_vinop(inode), inode->i_mode);
 744         }
 745
 746         /* set dir completion flag? */
 747         if (S_ISDIR(inode->i_mode) &&
 748             ci->i_files == 0 && ci->i_subdirs == 0 &&
 749             ceph_snap(inode) == CEPH_NOSNAP &&
 750             (le32_to_cpu(info->cap.caps) & CEPH_CAP_FILE_SHARED) &&
 751             (issued & CEPH_CAP_FILE_EXCL) == 0 &&
 752             !__ceph_dir_is_complete(ci)) {
 753                 dout(" marking %p complete (empty)\n", inode);
 754                 __ceph_dir_set_complete(ci, atomic_read(&ci->i_release_count));
 755                 ci->i_max_offset = 2;
 756         }
 757 no_change:
 758         spin_unlock(&ci->i_ceph_lock);
 759
 760         /* queue truncate if we saw i_size decrease */
 761         if (queue_trunc)
 762                 ceph_queue_vmtruncate(inode);
 763
 764         /* populate frag tree */
 765         /* FIXME: move me up, if/when version reflects fragtree changes */
 766         nsplits = le32_to_cpu(info->fragtree.nsplits);
 767         mutex_lock(&ci->i_fragtree_mutex);
 768         rb_node = rb_first(&ci->i_fragtree);
 769         for (i = 0; i < nsplits; i++) {
 770                 u32 id = le32_to_cpu(info->fragtree.splits[i].frag);
 771                 frag = NULL;
 772                 while (rb_node) {
 773                         frag = rb_entry(rb_node, struct ceph_inode_frag, node);
 774                         if (ceph_frag_compare(frag->frag, id) >= 0) {
 775                                 if (frag->frag != id)
 776                                         frag = NULL;
 777                                 else
 778                                         rb_node = rb_next(rb_node);
 779                                 break;
 780                         }
 781                         rb_node = rb_next(rb_node);
 782                         rb_erase(&frag->node, &ci->i_fragtree);
 783                         kfree(frag);
 784                         frag = NULL;
 785                 }
 786                 if (!frag) {
 787                         frag = __get_or_create_frag(ci, id);
 788                         if (IS_ERR(frag))
 789                                 continue;
 790                 }
 791                 frag->split_by = le32_to_cpu(info->fragtree.splits[i].by);
 792                 dout(" frag %x split by %d\n", frag->frag, frag->split_by);
 793         }
 794         while (rb_node) {
 795                 frag = rb_entry(rb_node, struct ceph_inode_frag, node);
 796                 rb_node = rb_next(rb_node);
 797                 rb_erase(&frag->node, &ci->i_fragtree);
 798                 kfree(frag);
 799         }
 800         mutex_unlock(&ci->i_fragtree_mutex);
 801
 802         /* were we issued a capability? */
 803         if (info->cap.caps) {
 804                 if (ceph_snap(inode) == CEPH_NOSNAP) {
 805                         ceph_add_cap(inode, session,
 806                                      le64_to_cpu(info->cap.cap_id),
 807                                      cap_fmode,
 808                                      le32_to_cpu(info->cap.caps),
 809                                      le32_to_cpu(info->cap.wanted),
 810                                      le32_to_cpu(info->cap.seq),
 811                                      le32_to_cpu(info->cap.mseq),
 812                                      le64_to_cpu(info->cap.realm),
 813                                      info->cap.flags,
 814                                      caps_reservation);
 815                 } else {
 816                         spin_lock(&ci->i_ceph_lock);
 817                         dout(" %p got snap_caps %s\n", inode,
 818                              ceph_cap_string(le32_to_cpu(info->cap.caps)));
 819                         ci->i_snap_caps |= le32_to_cpu(info->cap.caps);
 820                         if (cap_fmode >= 0)
 821                                 __ceph_get_fmode(ci, cap_fmode);
 822                         spin_unlock(&ci->i_ceph_lock);
 823                 }
 824         } else if (cap_fmode >= 0) {
 825                 pr_warning("mds issued no caps on %llx.%llx\n",
 826                            ceph_vinop(inode));
 827                 __ceph_get_fmode(ci, cap_fmode);
 828         }
 829
 830         /* update delegation info? */
 831         if (dirinfo)
 832                 ceph_fill_dirfrag(inode, dirinfo);
 833
 834         err = 0;
 835
 836 out:
 837         if (xattr_blob)
 838                 ceph_buffer_put(xattr_blob);
 839         return err;
 840 }
 841
 842 /*
 843  * caller should hold session s_mutex.
 844  */
 845 static void update_dentry_lease(struct dentry *dentry,
 846                                 struct ceph_mds_reply_lease *lease,
 847                                 struct ceph_mds_session *session,
 848                                 unsigned long from_time)
 849 {
 850         struct ceph_dentry_info *di = ceph_dentry(dentry);
 851         long unsigned duration = le32_to_cpu(lease->duration_ms);
 852         long unsigned ttl = from_time + (duration * HZ) / 1000;
 853         long unsigned half_ttl = from_time + (duration * HZ / 2) / 1000;
 854         struct inode *dir;
 855
 856         /* only track leases on regular dentries */
 857         if (dentry->d_op != &ceph_dentry_ops)
 858                 return;
 859
 860         spin_lock(&dentry->d_lock);
 861         dout("update_dentry_lease %p duration %lu ms ttl %lu\n",
 862              dentry, duration, ttl);
 863
 864         /* make lease_rdcache_gen match directory */
 865         dir = dentry->d_parent->d_inode;
 866         di->lease_shared_gen = ceph_inode(dir)->i_shared_gen;
 867
 868         if (duration == 0)
 869                 goto out_unlock;
 870
 871         if (di->lease_gen == session->s_cap_gen &&
 872             time_before(ttl, dentry->d_time))
 873                 goto out_unlock;  /* we already have a newer lease. */
 874
 875         if (di->lease_session && di->lease_session != session)
 876                 goto out_unlock;
 877
 878         ceph_dentry_lru_touch(dentry);
 879
 880         if (!di->lease_session)
 881                 di->lease_session = ceph_get_mds_session(session);
 882         di->lease_gen = session->s_cap_gen;
 883         di->lease_seq = le32_to_cpu(lease->seq);
 884         di->lease_renew_after = half_ttl;
 885         di->lease_renew_from = 0;
 886         dentry->d_time = ttl;
 887 out_unlock:
 888         spin_unlock(&dentry->d_lock);
 889         return;
 890 }
 891
 892 /*
 893  * Set dentry's directory position based on the current dir's max, and
 894  * order it in d_subdirs, so that dcache_readdir behaves.
 895  *
 896  * Always called under directory's i_mutex.
 897  */
 898 static void ceph_set_dentry_offset(struct dentry *dn)
 899 {
 900         struct dentry *dir = dn->d_parent;
 901         struct inode *inode = dir->d_inode;
 902         struct ceph_inode_info *ci;
 903         struct ceph_dentry_info *di;
 904
 905         BUG_ON(!inode);
 906
 907         ci = ceph_inode(inode);
 908         di = ceph_dentry(dn);
 909
 910         spin_lock(&ci->i_ceph_lock);
 911         if (!__ceph_dir_is_complete(ci)) {
 912                 spin_unlock(&ci->i_ceph_lock);
 913                 return;
 914         }
 915         di->offset = ceph_inode(inode)->i_max_offset++;
 916         spin_unlock(&ci->i_ceph_lock);
 917
 918         spin_lock(&dir->d_lock);
 919         spin_lock_nested(&dn->d_lock, DENTRY_D_LOCK_NESTED);
 920         list_move(&dn->d_u.d_child, &dir->d_subdirs);
 921         dout("set_dentry_offset %p %lld (%p %p)\n", dn, di->offset,
 922              dn->d_u.d_child.prev, dn->d_u.d_child.next);
 923         spin_unlock(&dn->d_lock);
 924         spin_unlock(&dir->d_lock);
 925 }
 926
 927 /*
 928  * splice a dentry to an inode.
 929  * caller must hold directory i_mutex for this to be safe.
 930  *
 931  * we will only rehash the resulting dentry if @prehash is
 932  * true; @prehash will be set to false (for the benefit of
 933  * the caller) if we fail.
 934  */
 935 static struct dentry *splice_dentry(struct dentry *dn, struct inode *in,
 936                                     bool *prehash, bool set_offset)
 937 {
 938         struct dentry *realdn;
 939
 940         BUG_ON(dn->d_inode);
 941
 942         /* dn must be unhashed */
 943         if (!d_unhashed(dn))
 944                 d_drop(dn);
 945         realdn = d_materialise_unique(dn, in);
 946         if (IS_ERR(realdn)) {
 947                 pr_err("splice_dentry error %ld %p inode %p ino %llx.%llx\n",
 948                        PTR_ERR(realdn), dn, in, ceph_vinop(in));
 949                 if (prehash)
 950                         *prehash = false; /* don't rehash on error */
 951                 dn = realdn; /* note realdn contains the error */
 952                 goto out;
 953         } else if (realdn) {
 954                 dout("dn %p (%d) spliced with %p (%d) "
 955                      "inode %p ino %llx.%llx\n",
 956                      dn, d_count(dn),
 957                      realdn, d_count(realdn),
 958                      realdn->d_inode, ceph_vinop(realdn->d_inode));
 959                 dput(dn);
 960                 dn = realdn;
 961         } else {
 962                 BUG_ON(!ceph_dentry(dn));
 963                 dout("dn %p attached to %p ino %llx.%llx\n",
 964                      dn, dn->d_inode, ceph_vinop(dn->d_inode));
 965         }
 966         if ((!prehash || *prehash) && d_unhashed(dn))
 967                 d_rehash(dn);
 968         if (set_offset)
 969                 ceph_set_dentry_offset(dn);
 970 out:
 971         return dn;
 972 }
 973
 974 /*
 975  * Incorporate results into the local cache.  This is either just
 976  * one inode, or a directory, dentry, and possibly linked-to inode (e.g.,
 977  * after a lookup).
 978  *
 979  * A reply may contain
 980  *         a directory inode along with a dentry.
 981  *  and/or a target inode
 982  *
 983  * Called with snap_rwsem (read).
 984  */
 985 int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req,
 986                     struct ceph_mds_session *session)
 987 {
 988         struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
 989         struct inode *in = NULL;
 990         struct ceph_mds_reply_inode *ininfo;
 991         struct ceph_vino vino;
 992         struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
 993         int err = 0;
 994
 995         dout("fill_trace %p is_dentry %d is_target %d\n", req,
 996              rinfo->head->is_dentry, rinfo->head->is_target);
 997
 998 #if 0
 999         /*
1000          * Debugging hook:
1001          *
1002          * If we resend completed ops to a recovering mds, we get no
1003          * trace.  Since that is very rare, pretend this is the case
1004          * to ensure the 'no trace' handlers in the callers behave.
1005          *
1006          * Fill in inodes unconditionally to avoid breaking cap
1007          * invariants.
1008          */
1009         if (rinfo->head->op & CEPH_MDS_OP_WRITE) {
1010                 pr_info("fill_trace faking empty trace on %lld %s\n",
1011                         req->r_tid, ceph_mds_op_name(rinfo->head->op));
1012                 if (rinfo->head->is_dentry) {
1013                         rinfo->head->is_dentry = 0;
1014                         err = fill_inode(req->r_locked_dir,
1015                                          &rinfo->diri, rinfo->dirfrag,
1016                                          session, req->r_request_started, -1);
1017                 }
1018                 if (rinfo->head->is_target) {
1019                         rinfo->head->is_target = 0;
1020                         ininfo = rinfo->targeti.in;
1021                         vino.ino = le64_to_cpu(ininfo->ino);
1022                         vino.snap = le64_to_cpu(ininfo->snapid);
1023                         in = ceph_get_inode(sb, vino);
1024                         err = fill_inode(in, &rinfo->targeti, NULL,
1025                                          session, req->r_request_started,
1026                                          req->r_fmode);
1027                         iput(in);
1028                 }
1029         }
1030 #endif
1031
1032         if (!rinfo->head->is_target && !rinfo->head->is_dentry) {
1033                 dout("fill_trace reply is empty!\n");
1034                 if (rinfo->head->result == 0 && req->r_locked_dir)
1035                         ceph_invalidate_dir_request(req);
1036                 return 0;
1037         }
1038
1039         if (rinfo->head->is_dentry) {
1040                 struct inode *dir = req->r_locked_dir;
1041
1042                 if (dir) {
1043                         err = fill_inode(dir, &rinfo->diri, rinfo->dirfrag,
1044                                          session, req->r_request_started, -1,
1045                                          &req->r_caps_reservation);
1046                         if (err < 0)
1047                                 return err;
1048                 } else {
1049                         WARN_ON_ONCE(1);
1050                 }
1051         }
1052
1053         if (rinfo->head->is_target) {
1054                 vino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1055                 vino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1056
1057                 in = ceph_get_inode(sb, vino);
1058                 if (IS_ERR(in)) {
1059                         err = PTR_ERR(in);
1060                         goto done;
1061                 }
1062                 req->r_target_inode = in;
1063
1064                 err = fill_inode(in, &rinfo->targeti, NULL,
1065                                 session, req->r_request_started,
1066                                 (le32_to_cpu(rinfo->head->result) == 0) ?
1067                                 req->r_fmode : -1,
1068                                 &req->r_caps_reservation);
1069                 if (err < 0) {
1070                         pr_err("fill_inode badness %p %llx.%llx\n",
1071                                 in, ceph_vinop(in));
1072                         goto done;
1073                 }
1074         }
1075
1076         /*
1077          * ignore null lease/binding on snapdir ENOENT, or else we
1078          * will have trouble splicing in the virtual snapdir later
1079          */
1080         if (rinfo->head->is_dentry && !req->r_aborted &&
1081             req->r_locked_dir &&
1082             (rinfo->head->is_target || strncmp(req->r_dentry->d_name.name,
1083                                                fsc->mount_options->snapdir_name,
1084                                                req->r_dentry->d_name.len))) {
1085                 /*
1086                  * lookup link rename   : null -> possibly existing inode
1087                  * mknod symlink mkdir  : null -> new inode
1088                  * unlink               : linked -> null
1089                  */
1090                 struct inode *dir = req->r_locked_dir;
1091                 struct dentry *dn = req->r_dentry;
1092                 bool have_dir_cap, have_lease;
1093
1094                 BUG_ON(!dn);
1095                 BUG_ON(!dir);
1096                 BUG_ON(dn->d_parent->d_inode != dir);
1097                 BUG_ON(ceph_ino(dir) !=
1098                        le64_to_cpu(rinfo->diri.in->ino));
1099                 BUG_ON(ceph_snap(dir) !=
1100                        le64_to_cpu(rinfo->diri.in->snapid));
1101
1102                 /* do we have a lease on the whole dir? */
1103                 have_dir_cap =
1104                         (le32_to_cpu(rinfo->diri.in->cap.caps) &
1105                          CEPH_CAP_FILE_SHARED);
1106
1107                 /* do we have a dn lease? */
1108                 have_lease = have_dir_cap ||
1109                         le32_to_cpu(rinfo->dlease->duration_ms);
1110                 if (!have_lease)
1111                         dout("fill_trace  no dentry lease or dir cap\n");
1112
1113                 /* rename? */
1114                 if (req->r_old_dentry && req->r_op == CEPH_MDS_OP_RENAME) {
1115                         dout(" src %p '%.*s' dst %p '%.*s'\n",
1116                              req->r_old_dentry,
1117                              req->r_old_dentry->d_name.len,
1118                              req->r_old_dentry->d_name.name,
1119                              dn, dn->d_name.len, dn->d_name.name);
1120                         dout("fill_trace doing d_move %p -> %p\n",
1121                              req->r_old_dentry, dn);
1122
1123                         d_move(req->r_old_dentry, dn);
1124                         dout(" src %p '%.*s' dst %p '%.*s'\n",
1125                              req->r_old_dentry,
1126                              req->r_old_dentry->d_name.len,
1127                              req->r_old_dentry->d_name.name,
1128                              dn, dn->d_name.len, dn->d_name.name);
1129
1130                         /* ensure target dentry is invalidated, despite
1131                            rehashing bug in vfs_rename_dir */
1132                         ceph_invalidate_dentry_lease(dn);
1133
1134                         /*
1135                          * d_move() puts the renamed dentry at the end of
1136                          * d_subdirs.  We need to assign it an appropriate
1137                          * directory offset so we can behave when dir is
1138                          * complete.
1139                          */
1140                         ceph_set_dentry_offset(req->r_old_dentry);
1141                         dout("dn %p gets new offset %lld\n", req->r_old_dentry,
1142                              ceph_dentry(req->r_old_dentry)->offset);
1143
1144                         dn = req->r_old_dentry;  /* use old_dentry */
1145                 }
1146
1147                 /* null dentry? */
1148                 if (!rinfo->head->is_target) {
1149                         dout("fill_trace null dentry\n");
1150                         if (dn->d_inode) {
1151                                 dout("d_delete %p\n", dn);
1152                                 d_delete(dn);
1153                         } else {
1154                                 dout("d_instantiate %p NULL\n", dn);
1155                                 d_instantiate(dn, NULL);
1156                                 if (have_lease && d_unhashed(dn))
1157                                         d_rehash(dn);
1158                                 update_dentry_lease(dn, rinfo->dlease,
1159                                                     session,
1160                                                     req->r_request_started);
1161                         }
1162                         goto done;
1163                 }
1164
1165                 /* attach proper inode */
1166                 if (!dn->d_inode) {
1167                         ihold(in);
1168                         dn = splice_dentry(dn, in, &have_lease, true);
1169                         if (IS_ERR(dn)) {
1170                                 err = PTR_ERR(dn);
1171                                 goto done;
1172                         }
1173                         req->r_dentry = dn;  /* may have spliced */
1174                 } else if (dn->d_inode && dn->d_inode != in) {
1175                         dout(" %p links to %p %llx.%llx, not %llx.%llx\n",
1176                              dn, dn->d_inode, ceph_vinop(dn->d_inode),
1177                              ceph_vinop(in));
1178                         have_lease = false;
1179                 }
1180
1181                 if (have_lease)
1182                         update_dentry_lease(dn, rinfo->dlease, session,
1183                                             req->r_request_started);
1184                 dout(" final dn %p\n", dn);
1185         } else if (!req->r_aborted &&
1186                    (req->r_op == CEPH_MDS_OP_LOOKUPSNAP ||
1187                     req->r_op == CEPH_MDS_OP_MKSNAP)) {
1188                 struct dentry *dn = req->r_dentry;
1189
1190                 /* fill out a snapdir LOOKUPSNAP dentry */
1191                 BUG_ON(!dn);
1192                 BUG_ON(!req->r_locked_dir);
1193                 BUG_ON(ceph_snap(req->r_locked_dir) != CEPH_SNAPDIR);
1194                 ininfo = rinfo->targeti.in;
1195                 vino.ino = le64_to_cpu(ininfo->ino);
1196                 vino.snap = le64_to_cpu(ininfo->snapid);
1197                 dout(" linking snapped dir %p to dn %p\n", in, dn);
1198                 ihold(in);
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         }
1206 done:
1207         dout("fill_trace done err=%d\n", err);
1208         return err;
1209 }
1210
1211 /*
1212  * Prepopulate our cache with readdir results, leases, etc.
1213  */
1214 static int readdir_prepopulate_inodes_only(struct ceph_mds_request *req,
1215                                            struct ceph_mds_session *session)
1216 {
1217         struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1218         int i, err = 0;
1219
1220         for (i = 0; i < rinfo->dir_nr; i++) {
1221                 struct ceph_vino vino;
1222                 struct inode *in;
1223                 int rc;
1224
1225                 vino.ino = le64_to_cpu(rinfo->dir_in[i].in->ino);
1226                 vino.snap = le64_to_cpu(rinfo->dir_in[i].in->snapid);
1227
1228                 in = ceph_get_inode(req->r_dentry->d_sb, vino);
1229                 if (IS_ERR(in)) {
1230                         err = PTR_ERR(in);
1231                         dout("new_inode badness got %d\n", err);
1232                         continue;
1233                 }
1234                 rc = fill_inode(in, &rinfo->dir_in[i], NULL, session,
1235                                 req->r_request_started, -1,
1236                                 &req->r_caps_reservation);
1237                 if (rc < 0) {
1238                         pr_err("fill_inode badness on %p got %d\n", in, rc);
1239                         err = rc;
1240                         continue;
1241                 }
1242         }
1243
1244         return err;
1245 }
1246
1247 int ceph_readdir_prepopulate(struct ceph_mds_request *req,
1248                              struct ceph_mds_session *session)
1249 {
1250         struct dentry *parent = req->r_dentry;
1251         struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1252         struct qstr dname;
1253         struct dentry *dn;
1254         struct inode *in;
1255         int err = 0, ret, i;
1256         struct inode *snapdir = NULL;
1257         struct ceph_mds_request_head *rhead = req->r_request->front.iov_base;
1258         struct ceph_dentry_info *di;
1259         u64 r_readdir_offset = req->r_readdir_offset;
1260         u32 frag = le32_to_cpu(rhead->args.readdir.frag);
1261
1262         if (rinfo->dir_dir &&
1263             le32_to_cpu(rinfo->dir_dir->frag) != frag) {
1264                 dout("readdir_prepopulate got new frag %x -> %x\n",
1265                      frag, le32_to_cpu(rinfo->dir_dir->frag));
1266                 frag = le32_to_cpu(rinfo->dir_dir->frag);
1267                 if (ceph_frag_is_leftmost(frag))
1268                         r_readdir_offset = 2;
1269                 else
1270                         r_readdir_offset = 0;
1271         }
1272
1273         if (req->r_aborted)
1274                 return readdir_prepopulate_inodes_only(req, session);
1275
1276         if (le32_to_cpu(rinfo->head->op) == CEPH_MDS_OP_LSSNAP) {
1277                 snapdir = ceph_get_snapdir(parent->d_inode);
1278                 parent = d_find_alias(snapdir);
1279                 dout("readdir_prepopulate %d items under SNAPDIR dn %p\n",
1280                      rinfo->dir_nr, parent);
1281         } else {
1282                 dout("readdir_prepopulate %d items under dn %p\n",
1283                      rinfo->dir_nr, parent);
1284                 if (rinfo->dir_dir)
1285                         ceph_fill_dirfrag(parent->d_inode, rinfo->dir_dir);
1286         }
1287
1288         /* FIXME: release caps/leases if error occurs */
1289         for (i = 0; i < rinfo->dir_nr; i++) {
1290                 struct ceph_vino vino;
1291
1292                 dname.name = rinfo->dir_dname[i];
1293                 dname.len = rinfo->dir_dname_len[i];
1294                 dname.hash = full_name_hash(dname.name, dname.len);
1295
1296                 vino.ino = le64_to_cpu(rinfo->dir_in[i].in->ino);
1297                 vino.snap = le64_to_cpu(rinfo->dir_in[i].in->snapid);
1298
1299 retry_lookup:
1300                 dn = d_lookup(parent, &dname);
1301                 dout("d_lookup on parent=%p name=%.*s got %p\n",
1302                      parent, dname.len, dname.name, dn);
1303
1304                 if (!dn) {
1305                         dn = d_alloc(parent, &dname);
1306                         dout("d_alloc %p '%.*s' = %p\n", parent,
1307                              dname.len, dname.name, dn);
1308                         if (dn == NULL) {
1309                                 dout("d_alloc badness\n");
1310                                 err = -ENOMEM;
1311                                 goto out;
1312                         }
1313                         ret = ceph_init_dentry(dn);
1314                         if (ret < 0) {
1315                                 dput(dn);
1316                                 err = ret;
1317                                 goto out;
1318                         }
1319                 } else if (dn->d_inode &&
1320                            (ceph_ino(dn->d_inode) != vino.ino ||
1321                             ceph_snap(dn->d_inode) != vino.snap)) {
1322                         dout(" dn %p points to wrong inode %p\n",
1323                              dn, dn->d_inode);
1324                         d_delete(dn);
1325                         dput(dn);
1326                         goto retry_lookup;
1327                 } else {
1328                         /* reorder parent's d_subdirs */
1329                         spin_lock(&parent->d_lock);
1330                         spin_lock_nested(&dn->d_lock, DENTRY_D_LOCK_NESTED);
1331                         list_move(&dn->d_u.d_child, &parent->d_subdirs);
1332                         spin_unlock(&dn->d_lock);
1333                         spin_unlock(&parent->d_lock);
1334                 }
1335
1336                 /* inode */
1337                 if (dn->d_inode) {
1338                         in = dn->d_inode;
1339                 } else {
1340                         in = ceph_get_inode(parent->d_sb, vino);
1341                         if (IS_ERR(in)) {
1342                                 dout("new_inode badness\n");
1343                                 d_drop(dn);
1344                                 dput(dn);
1345                                 err = PTR_ERR(in);
1346                                 goto out;
1347                         }
1348                 }
1349
1350                 if (fill_inode(in, &rinfo->dir_in[i], NULL, session,
1351                                req->r_request_started, -1,
1352                                &req->r_caps_reservation) < 0) {
1353                         pr_err("fill_inode badness on %p\n", in);
1354                         if (!dn->d_inode)
1355                                 iput(in);
1356                         d_drop(dn);
1357                         goto next_item;
1358                 }
1359
1360                 if (!dn->d_inode) {
1361                         dn = splice_dentry(dn, in, NULL, false);
1362                         if (IS_ERR(dn)) {
1363                                 err = PTR_ERR(dn);
1364                                 dn = NULL;
1365                                 goto next_item;
1366                         }
1367                 }
1368
1369                 di = dn->d_fsdata;
1370                 di->offset = ceph_make_fpos(frag, i + r_readdir_offset);
1371
1372                 update_dentry_lease(dn, rinfo->dir_dlease[i],
1373                                     req->r_session,
1374                                     req->r_request_started);
1375 next_item:
1376                 if (dn)
1377                         dput(dn);
1378         }
1379         if (err == 0)
1380                 req->r_did_prepopulate = true;
1381
1382 out:
1383         if (snapdir) {
1384                 iput(snapdir);
1385                 dput(parent);
1386         }
1387         dout("readdir_prepopulate done\n");
1388         return err;
1389 }
1390
1391 int ceph_inode_set_size(struct inode *inode, loff_t size)
1392 {
1393         struct ceph_inode_info *ci = ceph_inode(inode);
1394         int ret = 0;
1395
1396         spin_lock(&ci->i_ceph_lock);
1397         dout("set_size %p %llu -> %llu\n", inode, inode->i_size, size);
1398         inode->i_size = size;
1399         inode->i_blocks = (size + (1 << 9) - 1) >> 9;
1400
1401         /* tell the MDS if we are approaching max_size */
1402         if ((size << 1) >= ci->i_max_size &&
1403             (ci->i_reported_size << 1) < ci->i_max_size)
1404                 ret = 1;
1405
1406         spin_unlock(&ci->i_ceph_lock);
1407         return ret;
1408 }
1409
1410 /*
1411  * Write back inode data in a worker thread.  (This can't be done
1412  * in the message handler context.)
1413  */
1414 void ceph_queue_writeback(struct inode *inode)
1415 {
1416         ihold(inode);
1417         if (queue_work(ceph_inode_to_client(inode)->wb_wq,
1418                        &ceph_inode(inode)->i_wb_work)) {
1419                 dout("ceph_queue_writeback %p\n", inode);
1420         } else {
1421                 dout("ceph_queue_writeback %p failed\n", inode);
1422                 iput(inode);
1423         }
1424 }
1425
1426 static void ceph_writeback_work(struct work_struct *work)
1427 {
1428         struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1429                                                   i_wb_work);
1430         struct inode *inode = &ci->vfs_inode;
1431
1432         dout("writeback %p\n", inode);
1433         filemap_fdatawrite(&inode->i_data);
1434         iput(inode);
1435 }
1436
1437 /*
1438  * queue an async invalidation
1439  */
1440 void ceph_queue_invalidate(struct inode *inode)
1441 {
1442         ihold(inode);
1443         if (queue_work(ceph_inode_to_client(inode)->pg_inv_wq,
1444                        &ceph_inode(inode)->i_pg_inv_work)) {
1445                 dout("ceph_queue_invalidate %p\n", inode);
1446         } else {
1447                 dout("ceph_queue_invalidate %p failed\n", inode);
1448                 iput(inode);
1449         }
1450 }
1451
1452 /*
1453  * Invalidate inode pages in a worker thread.  (This can't be done
1454  * in the message handler context.)
1455  */
1456 static void ceph_invalidate_work(struct work_struct *work)
1457 {
1458         struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1459                                                   i_pg_inv_work);
1460         struct inode *inode = &ci->vfs_inode;
1461         u32 orig_gen;
1462         int check = 0;
1463
1464         mutex_lock(&ci->i_truncate_mutex);
1465         spin_lock(&ci->i_ceph_lock);
1466         dout("invalidate_pages %p gen %d revoking %d\n", inode,
1467              ci->i_rdcache_gen, ci->i_rdcache_revoking);
1468         if (ci->i_rdcache_revoking != ci->i_rdcache_gen) {
1469                 if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE))
1470                         check = 1;
1471                 spin_unlock(&ci->i_ceph_lock);
1472                 mutex_unlock(&ci->i_truncate_mutex);
1473                 goto out;
1474         }
1475         orig_gen = ci->i_rdcache_gen;
1476         spin_unlock(&ci->i_ceph_lock);
1477
1478         truncate_inode_pages(inode->i_mapping, 0);
1479
1480         spin_lock(&ci->i_ceph_lock);
1481         if (orig_gen == ci->i_rdcache_gen &&
1482             orig_gen == ci->i_rdcache_revoking) {
1483                 dout("invalidate_pages %p gen %d successful\n", inode,
1484                      ci->i_rdcache_gen);
1485                 ci->i_rdcache_revoking--;
1486                 check = 1;
1487         } else {
1488                 dout("invalidate_pages %p gen %d raced, now %d revoking %d\n",
1489                      inode, orig_gen, ci->i_rdcache_gen,
1490                      ci->i_rdcache_revoking);
1491                 if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE))
1492                         check = 1;
1493         }
1494         spin_unlock(&ci->i_ceph_lock);
1495         mutex_unlock(&ci->i_truncate_mutex);
1496 out:
1497         if (check)
1498                 ceph_check_caps(ci, 0, NULL);
1499         iput(inode);
1500 }
1501
1502
1503 /*
1504  * called by trunc_wq;
1505  *
1506  * We also truncate in a separate thread as well.
1507  */
1508 static void ceph_vmtruncate_work(struct work_struct *work)
1509 {
1510         struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1511                                                   i_vmtruncate_work);
1512         struct inode *inode = &ci->vfs_inode;
1513
1514         dout("vmtruncate_work %p\n", inode);
1515         __ceph_do_pending_vmtruncate(inode);
1516         iput(inode);
1517 }
1518
1519 /*
1520  * Queue an async vmtruncate.  If we fail to queue work, we will handle
1521  * the truncation the next time we call __ceph_do_pending_vmtruncate.
1522  */
1523 void ceph_queue_vmtruncate(struct inode *inode)
1524 {
1525         struct ceph_inode_info *ci = ceph_inode(inode);
1526
1527         ihold(inode);
1528
1529         if (queue_work(ceph_sb_to_client(inode->i_sb)->trunc_wq,
1530                        &ci->i_vmtruncate_work)) {
1531                 dout("ceph_queue_vmtruncate %p\n", inode);
1532         } else {
1533                 dout("ceph_queue_vmtruncate %p failed, pending=%d\n",
1534                      inode, ci->i_truncate_pending);
1535                 iput(inode);
1536         }
1537 }
1538
1539 /*
1540  * Make sure any pending truncation is applied before doing anything
1541  * that may depend on it.
1542  */
1543 void __ceph_do_pending_vmtruncate(struct inode *inode)
1544 {
1545         struct ceph_inode_info *ci = ceph_inode(inode);
1546         u64 to;
1547         int wrbuffer_refs, finish = 0;
1548
1549         mutex_lock(&ci->i_truncate_mutex);
1550 retry:
1551         spin_lock(&ci->i_ceph_lock);
1552         if (ci->i_truncate_pending == 0) {
1553                 dout("__do_pending_vmtruncate %p none pending\n", inode);
1554                 spin_unlock(&ci->i_ceph_lock);
1555                 mutex_unlock(&ci->i_truncate_mutex);
1556                 return;
1557         }
1558
1559         /*
1560          * make sure any dirty snapped pages are flushed before we
1561          * possibly truncate them.. so write AND block!
1562          */
1563         if (ci->i_wrbuffer_ref_head < ci->i_wrbuffer_ref) {
1564                 dout("__do_pending_vmtruncate %p flushing snaps first\n",
1565                      inode);
1566                 spin_unlock(&ci->i_ceph_lock);
1567                 filemap_write_and_wait_range(&inode->i_data, 0,
1568                                              inode->i_sb->s_maxbytes);
1569                 goto retry;
1570         }
1571
1572         /* there should be no reader or writer */
1573         WARN_ON_ONCE(ci->i_rd_ref || ci->i_wr_ref);
1574
1575         to = ci->i_truncate_size;
1576         wrbuffer_refs = ci->i_wrbuffer_ref;
1577         dout("__do_pending_vmtruncate %p (%d) to %lld\n", inode,
1578              ci->i_truncate_pending, to);
1579         spin_unlock(&ci->i_ceph_lock);
1580
1581         truncate_inode_pages(inode->i_mapping, to);
1582
1583         spin_lock(&ci->i_ceph_lock);
1584         if (to == ci->i_truncate_size) {
1585                 ci->i_truncate_pending = 0;
1586                 finish = 1;
1587         }
1588         spin_unlock(&ci->i_ceph_lock);
1589         if (!finish)
1590                 goto retry;
1591
1592         mutex_unlock(&ci->i_truncate_mutex);
1593
1594         if (wrbuffer_refs == 0)
1595                 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
1596
1597         wake_up_all(&ci->i_cap_wq);
1598 }
1599
1600 /*
1601  * symlinks
1602  */
1603 static void *ceph_sym_follow_link(struct dentry *dentry, struct nameidata *nd)
1604 {
1605         struct ceph_inode_info *ci = ceph_inode(dentry->d_inode);
1606         nd_set_link(nd, ci->i_symlink);
1607         return NULL;
1608 }
1609
1610 static const struct inode_operations ceph_symlink_iops = {
1611         .readlink = generic_readlink,
1612         .follow_link = ceph_sym_follow_link,
1613         .setattr = ceph_setattr,
1614         .getattr = ceph_getattr,
1615         .setxattr = ceph_setxattr,
1616         .getxattr = ceph_getxattr,
1617         .listxattr = ceph_listxattr,
1618         .removexattr = ceph_removexattr,
1619         .get_acl = ceph_get_acl,
1620         .set_acl = ceph_set_acl,
1621 };
1622
1623 /*
1624  * setattr
1625  */
1626 int ceph_setattr(struct dentry *dentry, struct iattr *attr)
1627 {
1628         struct inode *inode = dentry->d_inode;
1629         struct ceph_inode_info *ci = ceph_inode(inode);
1630         struct inode *parent_inode;
1631         const unsigned int ia_valid = attr->ia_valid;
1632         struct ceph_mds_request *req;
1633         struct ceph_mds_client *mdsc = ceph_sb_to_client(dentry->d_sb)->mdsc;
1634         int issued;
1635         int release = 0, dirtied = 0;
1636         int mask = 0;
1637         int err = 0;
1638         int inode_dirty_flags = 0;
1639
1640         if (ceph_snap(inode) != CEPH_NOSNAP)
1641                 return -EROFS;
1642
1643         err = inode_change_ok(inode, attr);
1644         if (err != 0)
1645                 return err;
1646
1647         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETATTR,
1648                                        USE_AUTH_MDS);
1649         if (IS_ERR(req))
1650                 return PTR_ERR(req);
1651
1652         spin_lock(&ci->i_ceph_lock);
1653         issued = __ceph_caps_issued(ci, NULL);
1654         dout("setattr %p issued %s\n", inode, ceph_cap_string(issued));
1655
1656         if (ia_valid & ATTR_UID) {
1657                 dout("setattr %p uid %d -> %d\n", inode,
1658                      from_kuid(&init_user_ns, inode->i_uid),
1659                      from_kuid(&init_user_ns, attr->ia_uid));
1660                 if (issued & CEPH_CAP_AUTH_EXCL) {
1661                         inode->i_uid = attr->ia_uid;
1662                         dirtied |= CEPH_CAP_AUTH_EXCL;
1663                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1664                            !uid_eq(attr->ia_uid, inode->i_uid)) {
1665                         req->r_args.setattr.uid = cpu_to_le32(
1666                                 from_kuid(&init_user_ns, attr->ia_uid));
1667                         mask |= CEPH_SETATTR_UID;
1668                         release |= CEPH_CAP_AUTH_SHARED;
1669                 }
1670         }
1671         if (ia_valid & ATTR_GID) {
1672                 dout("setattr %p gid %d -> %d\n", inode,
1673                      from_kgid(&init_user_ns, inode->i_gid),
1674                      from_kgid(&init_user_ns, attr->ia_gid));
1675                 if (issued & CEPH_CAP_AUTH_EXCL) {
1676                         inode->i_gid = attr->ia_gid;
1677                         dirtied |= CEPH_CAP_AUTH_EXCL;
1678                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1679                            !gid_eq(attr->ia_gid, inode->i_gid)) {
1680                         req->r_args.setattr.gid = cpu_to_le32(
1681                                 from_kgid(&init_user_ns, attr->ia_gid));
1682                         mask |= CEPH_SETATTR_GID;
1683                         release |= CEPH_CAP_AUTH_SHARED;
1684                 }
1685         }
1686         if (ia_valid & ATTR_MODE) {
1687                 dout("setattr %p mode 0%o -> 0%o\n", inode, inode->i_mode,
1688                      attr->ia_mode);
1689                 if (issued & CEPH_CAP_AUTH_EXCL) {
1690                         inode->i_mode = attr->ia_mode;
1691                         dirtied |= CEPH_CAP_AUTH_EXCL;
1692                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1693                            attr->ia_mode != inode->i_mode) {
1694                         inode->i_mode = attr->ia_mode;
1695                         req->r_args.setattr.mode = cpu_to_le32(attr->ia_mode);
1696                         mask |= CEPH_SETATTR_MODE;
1697                         release |= CEPH_CAP_AUTH_SHARED;
1698                 }
1699         }
1700
1701         if (ia_valid & ATTR_ATIME) {
1702                 dout("setattr %p atime %ld.%ld -> %ld.%ld\n", inode,
1703                      inode->i_atime.tv_sec, inode->i_atime.tv_nsec,
1704                      attr->ia_atime.tv_sec, attr->ia_atime.tv_nsec);
1705                 if (issued & CEPH_CAP_FILE_EXCL) {
1706                         ci->i_time_warp_seq++;
1707                         inode->i_atime = attr->ia_atime;
1708                         dirtied |= CEPH_CAP_FILE_EXCL;
1709                 } else if ((issued & CEPH_CAP_FILE_WR) &&
1710                            timespec_compare(&inode->i_atime,
1711                                             &attr->ia_atime) < 0) {
1712                         inode->i_atime = attr->ia_atime;
1713                         dirtied |= CEPH_CAP_FILE_WR;
1714                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1715                            !timespec_equal(&inode->i_atime, &attr->ia_atime)) {
1716                         ceph_encode_timespec(&req->r_args.setattr.atime,
1717                                              &attr->ia_atime);
1718                         mask |= CEPH_SETATTR_ATIME;
1719                         release |= CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_RD |
1720                                 CEPH_CAP_FILE_WR;
1721                 }
1722         }
1723         if (ia_valid & ATTR_MTIME) {
1724                 dout("setattr %p mtime %ld.%ld -> %ld.%ld\n", inode,
1725                      inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
1726                      attr->ia_mtime.tv_sec, attr->ia_mtime.tv_nsec);
1727                 if (issued & CEPH_CAP_FILE_EXCL) {
1728                         ci->i_time_warp_seq++;
1729                         inode->i_mtime = attr->ia_mtime;
1730                         dirtied |= CEPH_CAP_FILE_EXCL;
1731                 } else if ((issued & CEPH_CAP_FILE_WR) &&
1732                            timespec_compare(&inode->i_mtime,
1733                                             &attr->ia_mtime) < 0) {
1734                         inode->i_mtime = attr->ia_mtime;
1735                         dirtied |= CEPH_CAP_FILE_WR;
1736                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1737                            !timespec_equal(&inode->i_mtime, &attr->ia_mtime)) {
1738                         ceph_encode_timespec(&req->r_args.setattr.mtime,
1739                                              &attr->ia_mtime);
1740                         mask |= CEPH_SETATTR_MTIME;
1741                         release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD |
1742                                 CEPH_CAP_FILE_WR;
1743                 }
1744         }
1745         if (ia_valid & ATTR_SIZE) {
1746                 dout("setattr %p size %lld -> %lld\n", inode,
1747                      inode->i_size, attr->ia_size);
1748                 if (attr->ia_size > inode->i_sb->s_maxbytes) {
1749                         err = -EINVAL;
1750                         goto out;
1751                 }
1752                 if ((issued & CEPH_CAP_FILE_EXCL) &&
1753                     attr->ia_size > inode->i_size) {
1754                         inode->i_size = attr->ia_size;
1755                         inode->i_blocks =
1756                                 (attr->ia_size + (1 << 9) - 1) >> 9;
1757                         inode->i_ctime = attr->ia_ctime;
1758                         ci->i_reported_size = attr->ia_size;
1759                         dirtied |= CEPH_CAP_FILE_EXCL;
1760                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1761                            attr->ia_size != inode->i_size) {
1762                         req->r_args.setattr.size = cpu_to_le64(attr->ia_size);
1763                         req->r_args.setattr.old_size =
1764                                 cpu_to_le64(inode->i_size);
1765                         mask |= CEPH_SETATTR_SIZE;
1766                         release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD |
1767                                 CEPH_CAP_FILE_WR;
1768                 }
1769         }
1770
1771         /* these do nothing */
1772         if (ia_valid & ATTR_CTIME) {
1773                 bool only = (ia_valid & (ATTR_SIZE|ATTR_MTIME|ATTR_ATIME|
1774                                          ATTR_MODE|ATTR_UID|ATTR_GID)) == 0;
1775                 dout("setattr %p ctime %ld.%ld -> %ld.%ld (%s)\n", inode,
1776                      inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
1777                      attr->ia_ctime.tv_sec, attr->ia_ctime.tv_nsec,
1778                      only ? "ctime only" : "ignored");
1779                 inode->i_ctime = attr->ia_ctime;
1780                 if (only) {
1781                         /*
1782                          * if kernel wants to dirty ctime but nothing else,
1783                          * we need to choose a cap to dirty under, or do
1784                          * a almost-no-op setattr
1785                          */
1786                         if (issued & CEPH_CAP_AUTH_EXCL)
1787                                 dirtied |= CEPH_CAP_AUTH_EXCL;
1788                         else if (issued & CEPH_CAP_FILE_EXCL)
1789                                 dirtied |= CEPH_CAP_FILE_EXCL;
1790                         else if (issued & CEPH_CAP_XATTR_EXCL)
1791                                 dirtied |= CEPH_CAP_XATTR_EXCL;
1792                         else
1793                                 mask |= CEPH_SETATTR_CTIME;
1794                 }
1795         }
1796         if (ia_valid & ATTR_FILE)
1797                 dout("setattr %p ATTR_FILE ... hrm!\n", inode);
1798
1799         if (dirtied) {
1800                 inode_dirty_flags = __ceph_mark_dirty_caps(ci, dirtied);
1801                 inode->i_ctime = CURRENT_TIME;
1802         }
1803
1804         release &= issued;
1805         spin_unlock(&ci->i_ceph_lock);
1806
1807         if (inode_dirty_flags)
1808                 __mark_inode_dirty(inode, inode_dirty_flags);
1809
1810         if (ia_valid & ATTR_MODE) {
1811                 err = posix_acl_chmod(inode, attr->ia_mode);
1812                 if (err)
1813                         goto out_put;
1814         }
1815
1816         if (mask) {
1817                 req->r_inode = inode;
1818                 ihold(inode);
1819                 req->r_inode_drop = release;
1820                 req->r_args.setattr.mask = cpu_to_le32(mask);
1821                 req->r_num_caps = 1;
1822                 parent_inode = ceph_get_dentry_parent_inode(dentry);
1823                 err = ceph_mdsc_do_request(mdsc, parent_inode, req);
1824                 iput(parent_inode);
1825         }
1826         dout("setattr %p result=%d (%s locally, %d remote)\n", inode, err,
1827              ceph_cap_string(dirtied), mask);
1828
1829         ceph_mdsc_put_request(req);
1830         if (mask & CEPH_SETATTR_SIZE)
1831                 __ceph_do_pending_vmtruncate(inode);
1832         return err;
1833 out:
1834         spin_unlock(&ci->i_ceph_lock);
1835 out_put:
1836         ceph_mdsc_put_request(req);
1837         return err;
1838 }
1839
1840 /*
1841  * Verify that we have a lease on the given mask.  If not,
1842  * do a getattr against an mds.
1843  */
1844 int ceph_do_getattr(struct inode *inode, int mask)
1845 {
1846         struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
1847         struct ceph_mds_client *mdsc = fsc->mdsc;
1848         struct ceph_mds_request *req;
1849         int err;
1850
1851         if (ceph_snap(inode) == CEPH_SNAPDIR) {
1852                 dout("do_getattr inode %p SNAPDIR\n", inode);
1853                 return 0;
1854         }
1855
1856         dout("do_getattr inode %p mask %s mode 0%o\n", inode, ceph_cap_string(mask), inode->i_mode);
1857         if (ceph_caps_issued_mask(ceph_inode(inode), mask, 1))
1858                 return 0;
1859
1860         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
1861         if (IS_ERR(req))
1862                 return PTR_ERR(req);
1863         req->r_inode = inode;
1864         ihold(inode);
1865         req->r_num_caps = 1;
1866         req->r_args.getattr.mask = cpu_to_le32(mask);
1867         err = ceph_mdsc_do_request(mdsc, NULL, req);
1868         ceph_mdsc_put_request(req);
1869         dout("do_getattr result=%d\n", err);
1870         return err;
1871 }
1872
1873
1874 /*
1875  * Check inode permissions.  We verify we have a valid value for
1876  * the AUTH cap, then call the generic handler.
1877  */
1878 int ceph_permission(struct inode *inode, int mask)
1879 {
1880         int err;
1881
1882         if (mask & MAY_NOT_BLOCK)
1883                 return -ECHILD;
1884
1885         err = ceph_do_getattr(inode, CEPH_CAP_AUTH_SHARED);
1886
1887         if (!err)
1888                 err = generic_permission(inode, mask);
1889         return err;
1890 }
1891
1892 /*
1893  * Get all attributes.  Hopefully somedata we'll have a statlite()
1894  * and can limit the fields we require to be accurate.
1895  */
1896 int ceph_getattr(struct vfsmount *mnt, struct dentry *dentry,
1897                  struct kstat *stat)
1898 {
1899         struct inode *inode = dentry->d_inode;
1900         struct ceph_inode_info *ci = ceph_inode(inode);
1901         int err;
1902
1903         err = ceph_do_getattr(inode, CEPH_STAT_CAP_INODE_ALL);
1904         if (!err) {
1905                 generic_fillattr(inode, stat);
1906                 stat->ino = ceph_translate_ino(inode->i_sb, inode->i_ino);
1907                 if (ceph_snap(inode) != CEPH_NOSNAP)
1908                         stat->dev = ceph_snap(inode);
1909                 else
1910                         stat->dev = 0;
1911                 if (S_ISDIR(inode->i_mode)) {
1912                         if (ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb),
1913                                                 RBYTES))
1914                                 stat->size = ci->i_rbytes;
1915                         else
1916                                 stat->size = ci->i_files + ci->i_subdirs;
1917                         stat->blocks = 0;
1918                         stat->blksize = 65536;
1919                 }
1920         }
1921         return err;
1922 }