fs/ceph/inode.c

   1 #include "ceph_debug.h"
   2
   3 #include <linux/module.h>
   4 #include <linux/fs.h>
   5 #include <linux/smp_lock.h>
   6 #include <linux/slab.h>
   7 #include <linux/string.h>
   8 #include <linux/uaccess.h>
   9 #include <linux/kernel.h>
  10 #include <linux/namei.h>
  11 #include <linux/writeback.h>
  12 #include <linux/vmalloc.h>
  13 #include <linux/pagevec.h>
  14
  15 #include "super.h"
  16 #include "decode.h"
  17
  18 /*
  19  * Ceph inode operations
  20  *
  21  * Implement basic inode helpers (get, alloc) and inode ops (getattr,
  22  * setattr, etc.), xattr helpers, and helpers for assimilating
  23  * metadata returned by the MDS into our cache.
  24  *
  25  * Also define helpers for doing asynchronous writeback, invalidation,
  26  * and truncation for the benefit of those who can't afford to block
  27  * (typically because they are in the message handler path).
  28  */
  29
  30 static const struct inode_operations ceph_symlink_iops;
  31
  32 static void ceph_invalidate_work(struct work_struct *work);
  33 static void ceph_writeback_work(struct work_struct *work);
  34 static void ceph_vmtruncate_work(struct work_struct *work);
  35
  36 /*
  37  * find or create an inode, given the ceph ino number
  38  */
  39 struct inode *ceph_get_inode(struct super_block *sb, struct ceph_vino vino)
  40 {
  41         struct inode *inode;
  42         ino_t t = ceph_vino_to_ino(vino);
  43
  44         inode = iget5_locked(sb, t, ceph_ino_compare, ceph_set_ino_cb, &vino);
  45         if (inode == NULL)
  46                 return ERR_PTR(-ENOMEM);
  47         if (inode->i_state & I_NEW) {
  48                 dout("get_inode created new inode %p %llx.%llx ino %llx\n",
  49                      inode, ceph_vinop(inode), (u64)inode->i_ino);
  50                 unlock_new_inode(inode);
  51         }
  52
  53         dout("get_inode on %lu=%llx.%llx got %p\n", inode->i_ino, vino.ino,
  54              vino.snap, inode);
  55         return inode;
  56 }
  57
  58 /*
  59  * get/constuct snapdir inode for a given directory
  60  */
  61 struct inode *ceph_get_snapdir(struct inode *parent)
  62 {
  63         struct ceph_vino vino = {
  64                 .ino = ceph_ino(parent),
  65                 .snap = CEPH_SNAPDIR,
  66         };
  67         struct inode *inode = ceph_get_inode(parent->i_sb, vino);
  68         struct ceph_inode_info *ci = ceph_inode(inode);
  69
  70         BUG_ON(!S_ISDIR(parent->i_mode));
  71         if (IS_ERR(inode))
  72                 return inode;
  73         inode->i_mode = parent->i_mode;
  74         inode->i_uid = parent->i_uid;
  75         inode->i_gid = parent->i_gid;
  76         inode->i_op = &ceph_dir_iops;
  77         inode->i_fop = &ceph_dir_fops;
  78         ci->i_snap_caps = CEPH_CAP_PIN; /* so we can open */
  79         ci->i_rbytes = 0;
  80         return inode;
  81 }
  82
  83 const struct inode_operations ceph_file_iops = {
  84         .permission = ceph_permission,
  85         .setattr = ceph_setattr,
  86         .getattr = ceph_getattr,
  87         .setxattr = ceph_setxattr,
  88         .getxattr = ceph_getxattr,
  89         .listxattr = ceph_listxattr,
  90         .removexattr = ceph_removexattr,
  91 };
  92
  93
  94 /*
  95  * We use a 'frag tree' to keep track of the MDS's directory fragments
  96  * for a given inode (usually there is just a single fragment).  We
  97  * need to know when a child frag is delegated to a new MDS, or when
  98  * it is flagged as replicated, so we can direct our requests
  99  * accordingly.
 100  */
 101
 102 /*
 103  * find/create a frag in the tree
 104  */
 105 static struct ceph_inode_frag *__get_or_create_frag(struct ceph_inode_info *ci,
 106                                                     u32 f)
 107 {
 108         struct rb_node **p;
 109         struct rb_node *parent = NULL;
 110         struct ceph_inode_frag *frag;
 111         int c;
 112
 113         p = &ci->i_fragtree.rb_node;
 114         while (*p) {
 115                 parent = *p;
 116                 frag = rb_entry(parent, struct ceph_inode_frag, node);
 117                 c = ceph_frag_compare(f, frag->frag);
 118                 if (c < 0)
 119                         p = &(*p)->rb_left;
 120                 else if (c > 0)
 121                         p = &(*p)->rb_right;
 122                 else
 123                         return frag;
 124         }
 125
 126         frag = kmalloc(sizeof(*frag), GFP_NOFS);
 127         if (!frag) {
 128                 pr_err("__get_or_create_frag ENOMEM on %p %llx.%llx "
 129                        "frag %x\n", &ci->vfs_inode,
 130                        ceph_vinop(&ci->vfs_inode), f);
 131                 return ERR_PTR(-ENOMEM);
 132         }
 133         frag->frag = f;
 134         frag->split_by = 0;
 135         frag->mds = -1;
 136         frag->ndist = 0;
 137
 138         rb_link_node(&frag->node, parent, p);
 139         rb_insert_color(&frag->node, &ci->i_fragtree);
 140
 141         dout("get_or_create_frag added %llx.%llx frag %x\n",
 142              ceph_vinop(&ci->vfs_inode), f);
 143         return frag;
 144 }
 145
 146 /*
 147  * find a specific frag @f
 148  */
 149 struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci, u32 f)
 150 {
 151         struct rb_node *n = ci->i_fragtree.rb_node;
 152
 153         while (n) {
 154                 struct ceph_inode_frag *frag =
 155                         rb_entry(n, struct ceph_inode_frag, node);
 156                 int c = ceph_frag_compare(f, frag->frag);
 157                 if (c < 0)
 158                         n = n->rb_left;
 159                 else if (c > 0)
 160                         n = n->rb_right;
 161                 else
 162                         return frag;
 163         }
 164         return NULL;
 165 }
 166
 167 /*
 168  * Choose frag containing the given value @v.  If @pfrag is
 169  * specified, copy the frag delegation info to the caller if
 170  * it is present.
 171  */
 172 u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
 173                      struct ceph_inode_frag *pfrag,
 174                      int *found)
 175 {
 176         u32 t = ceph_frag_make(0, 0);
 177         struct ceph_inode_frag *frag;
 178         unsigned nway, i;
 179         u32 n;
 180
 181         if (found)
 182                 *found = 0;
 183
 184         mutex_lock(&ci->i_fragtree_mutex);
 185         while (1) {
 186                 WARN_ON(!ceph_frag_contains_value(t, v));
 187                 frag = __ceph_find_frag(ci, t);
 188                 if (!frag)
 189                         break; /* t is a leaf */
 190                 if (frag->split_by == 0) {
 191                         if (pfrag)
 192                                 memcpy(pfrag, frag, sizeof(*pfrag));
 193                         if (found)
 194                                 *found = 1;
 195                         break;
 196                 }
 197
 198                 /* choose child */
 199                 nway = 1 << frag->split_by;
 200                 dout("choose_frag(%x) %x splits by %d (%d ways)\n", v, t,
 201                      frag->split_by, nway);
 202                 for (i = 0; i < nway; i++) {
 203                         n = ceph_frag_make_child(t, frag->split_by, i);
 204                         if (ceph_frag_contains_value(n, v)) {
 205                                 t = n;
 206                                 break;
 207                         }
 208                 }
 209                 BUG_ON(i == nway);
 210         }
 211         dout("choose_frag(%x) = %x\n", v, t);
 212
 213         mutex_unlock(&ci->i_fragtree_mutex);
 214         return t;
 215 }
 216
 217 /*
 218  * Process dirfrag (delegation) info from the mds.  Include leaf
 219  * fragment in tree ONLY if ndist > 0.  Otherwise, only
 220  * branches/splits are included in i_fragtree)
 221  */
 222 static int ceph_fill_dirfrag(struct inode *inode,
 223                              struct ceph_mds_reply_dirfrag *dirinfo)
 224 {
 225         struct ceph_inode_info *ci = ceph_inode(inode);
 226         struct ceph_inode_frag *frag;
 227         u32 id = le32_to_cpu(dirinfo->frag);
 228         int mds = le32_to_cpu(dirinfo->auth);
 229         int ndist = le32_to_cpu(dirinfo->ndist);
 230         int i;
 231         int err = 0;
 232
 233         mutex_lock(&ci->i_fragtree_mutex);
 234         if (ndist == 0) {
 235                 /* no delegation info needed. */
 236                 frag = __ceph_find_frag(ci, id);
 237                 if (!frag)
 238                         goto out;
 239                 if (frag->split_by == 0) {
 240                         /* tree leaf, remove */
 241                         dout("fill_dirfrag removed %llx.%llx frag %x"
 242                              " (no ref)\n", ceph_vinop(inode), id);
 243                         rb_erase(&frag->node, &ci->i_fragtree);
 244                         kfree(frag);
 245                 } else {
 246                         /* tree branch, keep and clear */
 247                         dout("fill_dirfrag cleared %llx.%llx frag %x"
 248                              " referral\n", ceph_vinop(inode), id);
 249                         frag->mds = -1;
 250                         frag->ndist = 0;
 251                 }
 252                 goto out;
 253         }
 254
 255
 256         /* find/add this frag to store mds delegation info */
 257         frag = __get_or_create_frag(ci, id);
 258         if (IS_ERR(frag)) {
 259                 /* this is not the end of the world; we can continue
 260                    with bad/inaccurate delegation info */
 261                 pr_err("fill_dirfrag ENOMEM on mds ref %llx.%llx fg %x\n",
 262                        ceph_vinop(inode), le32_to_cpu(dirinfo->frag));
 263                 err = -ENOMEM;
 264                 goto out;
 265         }
 266
 267         frag->mds = mds;
 268         frag->ndist = min_t(u32, ndist, CEPH_MAX_DIRFRAG_REP);
 269         for (i = 0; i < frag->ndist; i++)
 270                 frag->dist[i] = le32_to_cpu(dirinfo->dist[i]);
 271         dout("fill_dirfrag %llx.%llx frag %x ndist=%d\n",
 272              ceph_vinop(inode), frag->frag, frag->ndist);
 273
 274 out:
 275         mutex_unlock(&ci->i_fragtree_mutex);
 276         return err;
 277 }
 278
 279
 280 /*
 281  * initialize a newly allocated inode.
 282  */
 283 struct inode *ceph_alloc_inode(struct super_block *sb)
 284 {
 285         struct ceph_inode_info *ci;
 286         int i;
 287
 288         ci = kmem_cache_alloc(ceph_inode_cachep, GFP_NOFS);
 289         if (!ci)
 290                 return NULL;
 291
 292         dout("alloc_inode %p\n", &ci->vfs_inode);
 293
 294         ci->i_version = 0;
 295         ci->i_time_warp_seq = 0;
 296         ci->i_ceph_flags = 0;
 297         ci->i_release_count = 0;
 298         ci->i_symlink = NULL;
 299
 300         ci->i_fragtree = RB_ROOT;
 301         mutex_init(&ci->i_fragtree_mutex);
 302
 303         ci->i_xattrs.blob = NULL;
 304         ci->i_xattrs.prealloc_blob = NULL;
 305         ci->i_xattrs.dirty = false;
 306         ci->i_xattrs.index = RB_ROOT;
 307         ci->i_xattrs.count = 0;
 308         ci->i_xattrs.names_size = 0;
 309         ci->i_xattrs.vals_size = 0;
 310         ci->i_xattrs.version = 0;
 311         ci->i_xattrs.index_version = 0;
 312
 313         ci->i_caps = RB_ROOT;
 314         ci->i_auth_cap = NULL;
 315         ci->i_dirty_caps = 0;
 316         ci->i_flushing_caps = 0;
 317         INIT_LIST_HEAD(&ci->i_dirty_item);
 318         INIT_LIST_HEAD(&ci->i_flushing_item);
 319         ci->i_cap_flush_seq = 0;
 320         ci->i_cap_flush_last_tid = 0;
 321         memset(&ci->i_cap_flush_tid, 0, sizeof(ci->i_cap_flush_tid));
 322         init_waitqueue_head(&ci->i_cap_wq);
 323         ci->i_hold_caps_min = 0;
 324         ci->i_hold_caps_max = 0;
 325         INIT_LIST_HEAD(&ci->i_cap_delay_list);
 326         ci->i_cap_exporting_mds = 0;
 327         ci->i_cap_exporting_mseq = 0;
 328         ci->i_cap_exporting_issued = 0;
 329         INIT_LIST_HEAD(&ci->i_cap_snaps);
 330         ci->i_head_snapc = NULL;
 331         ci->i_snap_caps = 0;
 332
 333         for (i = 0; i < CEPH_FILE_MODE_NUM; i++)
 334                 ci->i_nr_by_mode[i] = 0;
 335
 336         ci->i_truncate_seq = 0;
 337         ci->i_truncate_size = 0;
 338         ci->i_truncate_pending = 0;
 339
 340         ci->i_max_size = 0;
 341         ci->i_reported_size = 0;
 342         ci->i_wanted_max_size = 0;
 343         ci->i_requested_max_size = 0;
 344
 345         ci->i_pin_ref = 0;
 346         ci->i_rd_ref = 0;
 347         ci->i_rdcache_ref = 0;
 348         ci->i_wr_ref = 0;
 349         ci->i_wrbuffer_ref = 0;
 350         ci->i_wrbuffer_ref_head = 0;
 351         ci->i_shared_gen = 0;
 352         ci->i_rdcache_gen = 0;
 353         ci->i_rdcache_revoking = 0;
 354
 355         INIT_LIST_HEAD(&ci->i_unsafe_writes);
 356         INIT_LIST_HEAD(&ci->i_unsafe_dirops);
 357         spin_lock_init(&ci->i_unsafe_lock);
 358
 359         ci->i_snap_realm = NULL;
 360         INIT_LIST_HEAD(&ci->i_snap_realm_item);
 361         INIT_LIST_HEAD(&ci->i_snap_flush_item);
 362
 363         INIT_WORK(&ci->i_wb_work, ceph_writeback_work);
 364         INIT_WORK(&ci->i_pg_inv_work, ceph_invalidate_work);
 365
 366         INIT_WORK(&ci->i_vmtruncate_work, ceph_vmtruncate_work);
 367
 368         return &ci->vfs_inode;
 369 }
 370
 371 void ceph_destroy_inode(struct inode *inode)
 372 {
 373         struct ceph_inode_info *ci = ceph_inode(inode);
 374         struct ceph_inode_frag *frag;
 375         struct rb_node *n;
 376
 377         dout("destroy_inode %p ino %llx.%llx\n", inode, ceph_vinop(inode));
 378
 379         ceph_queue_caps_release(inode);
 380
 381         /*
 382          * we may still have a snap_realm reference if there are stray
 383          * caps in i_cap_exporting_issued or i_snap_caps.
 384          */
 385         if (ci->i_snap_realm) {
 386                 struct ceph_mds_client *mdsc =
 387                         &ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc;
 388                 struct ceph_snap_realm *realm = ci->i_snap_realm;
 389
 390                 dout(" dropping residual ref to snap realm %p\n", realm);
 391                 spin_lock(&realm->inodes_with_caps_lock);
 392                 list_del_init(&ci->i_snap_realm_item);
 393                 spin_unlock(&realm->inodes_with_caps_lock);
 394                 ceph_put_snap_realm(mdsc, realm);
 395         }
 396
 397         kfree(ci->i_symlink);
 398         while ((n = rb_first(&ci->i_fragtree)) != NULL) {
 399                 frag = rb_entry(n, struct ceph_inode_frag, node);
 400                 rb_erase(n, &ci->i_fragtree);
 401                 kfree(frag);
 402         }
 403
 404         __ceph_destroy_xattrs(ci);
 405         if (ci->i_xattrs.blob)
 406                 ceph_buffer_put(ci->i_xattrs.blob);
 407         if (ci->i_xattrs.prealloc_blob)
 408                 ceph_buffer_put(ci->i_xattrs.prealloc_blob);
 409
 410         kmem_cache_free(ceph_inode_cachep, ci);
 411 }
 412
 413
 414 /*
 415  * Helpers to fill in size, ctime, mtime, and atime.  We have to be
 416  * careful because either the client or MDS may have more up to date
 417  * info, depending on which capabilities are held, and whether
 418  * time_warp_seq or truncate_seq have increased.  (Ordinarily, mtime
 419  * and size are monotonically increasing, except when utimes() or
 420  * truncate() increments the corresponding _seq values.)
 421  */
 422 int ceph_fill_file_size(struct inode *inode, int issued,
 423                         u32 truncate_seq, u64 truncate_size, u64 size)
 424 {
 425         struct ceph_inode_info *ci = ceph_inode(inode);
 426         int queue_trunc = 0;
 427
 428         if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) > 0 ||
 429             (truncate_seq == ci->i_truncate_seq && size > inode->i_size)) {
 430                 dout("size %lld -> %llu\n", inode->i_size, size);
 431                 inode->i_size = size;
 432                 inode->i_blocks = (size + (1<<9) - 1) >> 9;
 433                 ci->i_reported_size = size;
 434                 if (truncate_seq != ci->i_truncate_seq) {
 435                         dout("truncate_seq %u -> %u\n",
 436                              ci->i_truncate_seq, truncate_seq);
 437                         ci->i_truncate_seq = truncate_seq;
 438                         /*
 439                          * If we hold relevant caps, or in the case where we're
 440                          * not the only client referencing this file and we
 441                          * don't hold those caps, then we need to check whether
 442                          * the file is either opened or mmaped
 443                          */
 444                         if ((issued & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_RD|
 445                                        CEPH_CAP_FILE_WR|CEPH_CAP_FILE_BUFFER|
 446                                        CEPH_CAP_FILE_EXCL|
 447                                        CEPH_CAP_FILE_LAZYIO)) ||
 448                             mapping_mapped(inode->i_mapping) ||
 449                             __ceph_caps_file_wanted(ci)) {
 450                                 ci->i_truncate_pending++;
 451                                 queue_trunc = 1;
 452                         }
 453                 }
 454         }
 455         if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) >= 0 &&
 456             ci->i_truncate_size != truncate_size) {
 457                 dout("truncate_size %lld -> %llu\n", ci->i_truncate_size,
 458                      truncate_size);
 459                 ci->i_truncate_size = truncate_size;
 460         }
 461         return queue_trunc;
 462 }
 463
 464 void ceph_fill_file_time(struct inode *inode, int issued,
 465                          u64 time_warp_seq, struct timespec *ctime,
 466                          struct timespec *mtime, struct timespec *atime)
 467 {
 468         struct ceph_inode_info *ci = ceph_inode(inode);
 469         int warn = 0;
 470
 471         if (issued & (CEPH_CAP_FILE_EXCL|
 472                       CEPH_CAP_FILE_WR|
 473                       CEPH_CAP_FILE_BUFFER)) {
 474                 if (timespec_compare(ctime, &inode->i_ctime) > 0) {
 475                         dout("ctime %ld.%09ld -> %ld.%09ld inc w/ cap\n",
 476                              inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
 477                              ctime->tv_sec, ctime->tv_nsec);
 478                         inode->i_ctime = *ctime;
 479                 }
 480                 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) > 0) {
 481                         /* the MDS did a utimes() */
 482                         dout("mtime %ld.%09ld -> %ld.%09ld "
 483                              "tw %d -> %d\n",
 484                              inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
 485                              mtime->tv_sec, mtime->tv_nsec,
 486                              ci->i_time_warp_seq, (int)time_warp_seq);
 487
 488                         inode->i_mtime = *mtime;
 489                         inode->i_atime = *atime;
 490                         ci->i_time_warp_seq = time_warp_seq;
 491                 } else if (time_warp_seq == ci->i_time_warp_seq) {
 492                         /* nobody did utimes(); take the max */
 493                         if (timespec_compare(mtime, &inode->i_mtime) > 0) {
 494                                 dout("mtime %ld.%09ld -> %ld.%09ld inc\n",
 495                                      inode->i_mtime.tv_sec,
 496                                      inode->i_mtime.tv_nsec,
 497                                      mtime->tv_sec, mtime->tv_nsec);
 498                                 inode->i_mtime = *mtime;
 499                         }
 500                         if (timespec_compare(atime, &inode->i_atime) > 0) {
 501                                 dout("atime %ld.%09ld -> %ld.%09ld inc\n",
 502                                      inode->i_atime.tv_sec,
 503                                      inode->i_atime.tv_nsec,
 504                                      atime->tv_sec, atime->tv_nsec);
 505                                 inode->i_atime = *atime;
 506                         }
 507                 } else if (issued & CEPH_CAP_FILE_EXCL) {
 508                         /* we did a utimes(); ignore mds values */
 509                 } else {
 510                         warn = 1;
 511                 }
 512         } else {
 513                 /* we have no write caps; whatever the MDS says is true */
 514                 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) >= 0) {
 515                         inode->i_ctime = *ctime;
 516                         inode->i_mtime = *mtime;
 517                         inode->i_atime = *atime;
 518                         ci->i_time_warp_seq = time_warp_seq;
 519                 } else {
 520                         warn = 1;
 521                 }
 522         }
 523         if (warn) /* time_warp_seq shouldn't go backwards */
 524                 dout("%p mds time_warp_seq %llu < %u\n",
 525                      inode, time_warp_seq, ci->i_time_warp_seq);
 526 }
 527
 528 /*
 529  * Populate an inode based on info from mds.  May be called on new or
 530  * existing inodes.
 531  */
 532 static int fill_inode(struct inode *inode,
 533                       struct ceph_mds_reply_info_in *iinfo,
 534                       struct ceph_mds_reply_dirfrag *dirinfo,
 535                       struct ceph_mds_session *session,
 536                       unsigned long ttl_from, int cap_fmode,
 537                       struct ceph_cap_reservation *caps_reservation)
 538 {
 539         struct ceph_mds_reply_inode *info = iinfo->in;
 540         struct ceph_inode_info *ci = ceph_inode(inode);
 541         int i;
 542         int issued, implemented;
 543         struct timespec mtime, atime, ctime;
 544         u32 nsplits;
 545         struct ceph_buffer *xattr_blob = NULL;
 546         int err = 0;
 547         int queue_trunc = 0;
 548
 549         dout("fill_inode %p ino %llx.%llx v %llu had %llu\n",
 550              inode, ceph_vinop(inode), le64_to_cpu(info->version),
 551              ci->i_version);
 552
 553         /*
 554          * prealloc xattr data, if it looks like we'll need it.  only
 555          * if len > 4 (meaning there are actually xattrs; the first 4
 556          * bytes are the xattr count).
 557          */
 558         if (iinfo->xattr_len > 4) {
 559                 xattr_blob = ceph_buffer_new(iinfo->xattr_len, GFP_NOFS);
 560                 if (!xattr_blob)
 561                         pr_err("fill_inode ENOMEM xattr blob %d bytes\n",
 562                                iinfo->xattr_len);
 563         }
 564
 565         spin_lock(&inode->i_lock);
 566
 567         /*
 568          * provided version will be odd if inode value is projected,
 569          * even if stable.  skip the update if we have a newer info
 570          * (e.g., due to inode info racing form multiple MDSs), or if
 571          * we are getting projected (unstable) inode info.
 572          */
 573         if (le64_to_cpu(info->version) > 0 &&
 574             (ci->i_version & ~1) > le64_to_cpu(info->version))
 575                 goto no_change;
 576
 577         issued = __ceph_caps_issued(ci, &implemented);
 578         issued |= implemented | __ceph_caps_dirty(ci);
 579
 580         /* update inode */
 581         ci->i_version = le64_to_cpu(info->version);
 582         inode->i_version++;
 583         inode->i_rdev = le32_to_cpu(info->rdev);
 584
 585         if ((issued & CEPH_CAP_AUTH_EXCL) == 0) {
 586                 inode->i_mode = le32_to_cpu(info->mode);
 587                 inode->i_uid = le32_to_cpu(info->uid);
 588                 inode->i_gid = le32_to_cpu(info->gid);
 589                 dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode,
 590                      inode->i_uid, inode->i_gid);
 591         }
 592
 593         if ((issued & CEPH_CAP_LINK_EXCL) == 0)
 594                 inode->i_nlink = le32_to_cpu(info->nlink);
 595
 596         /* be careful with mtime, atime, size */
 597         ceph_decode_timespec(&atime, &info->atime);
 598         ceph_decode_timespec(&mtime, &info->mtime);
 599         ceph_decode_timespec(&ctime, &info->ctime);
 600         queue_trunc = ceph_fill_file_size(inode, issued,
 601                                           le32_to_cpu(info->truncate_seq),
 602                                           le64_to_cpu(info->truncate_size),
 603                                           le64_to_cpu(info->size));
 604         ceph_fill_file_time(inode, issued,
 605                             le32_to_cpu(info->time_warp_seq),
 606                             &ctime, &mtime, &atime);
 607
 608         ci->i_max_size = le64_to_cpu(info->max_size);
 609         ci->i_layout = info->layout;
 610         inode->i_blkbits = fls(le32_to_cpu(info->layout.fl_stripe_unit)) - 1;
 611
 612         /* xattrs */
 613         /* note that if i_xattrs.len <= 4, i_xattrs.data will still be NULL. */
 614         if ((issued & CEPH_CAP_XATTR_EXCL) == 0 &&
 615             le64_to_cpu(info->xattr_version) > ci->i_xattrs.version) {
 616                 if (ci->i_xattrs.blob)
 617                         ceph_buffer_put(ci->i_xattrs.blob);
 618                 ci->i_xattrs.blob = xattr_blob;
 619                 if (xattr_blob)
 620                         memcpy(ci->i_xattrs.blob->vec.iov_base,
 621                                iinfo->xattr_data, iinfo->xattr_len);
 622                 ci->i_xattrs.version = le64_to_cpu(info->xattr_version);
 623                 xattr_blob = NULL;
 624         }
 625
 626         inode->i_mapping->a_ops = &ceph_aops;
 627         inode->i_mapping->backing_dev_info =
 628                 &ceph_sb_to_client(inode->i_sb)->backing_dev_info;
 629
 630         switch (inode->i_mode & S_IFMT) {
 631         case S_IFIFO:
 632         case S_IFBLK:
 633         case S_IFCHR:
 634         case S_IFSOCK:
 635                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
 636                 inode->i_op = &ceph_file_iops;
 637                 break;
 638         case S_IFREG:
 639                 inode->i_op = &ceph_file_iops;
 640                 inode->i_fop = &ceph_file_fops;
 641                 break;
 642         case S_IFLNK:
 643                 inode->i_op = &ceph_symlink_iops;
 644                 if (!ci->i_symlink) {
 645                         int symlen = iinfo->symlink_len;
 646                         char *sym;
 647
 648                         BUG_ON(symlen != inode->i_size);
 649                         spin_unlock(&inode->i_lock);
 650
 651                         err = -ENOMEM;
 652                         sym = kmalloc(symlen+1, GFP_NOFS);
 653                         if (!sym)
 654                                 goto out;
 655                         memcpy(sym, iinfo->symlink, symlen);
 656                         sym[symlen] = 0;
 657
 658                         spin_lock(&inode->i_lock);
 659                         if (!ci->i_symlink)
 660                                 ci->i_symlink = sym;
 661                         else
 662                                 kfree(sym); /* lost a race */
 663                 }
 664                 break;
 665         case S_IFDIR:
 666                 inode->i_op = &ceph_dir_iops;
 667                 inode->i_fop = &ceph_dir_fops;
 668
 669                 ci->i_files = le64_to_cpu(info->files);
 670                 ci->i_subdirs = le64_to_cpu(info->subdirs);
 671                 ci->i_rbytes = le64_to_cpu(info->rbytes);
 672                 ci->i_rfiles = le64_to_cpu(info->rfiles);
 673                 ci->i_rsubdirs = le64_to_cpu(info->rsubdirs);
 674                 ceph_decode_timespec(&ci->i_rctime, &info->rctime);
 675
 676                 /* set dir completion flag? */
 677                 if (ci->i_files == 0 && ci->i_subdirs == 0 &&
 678                     ceph_snap(inode) == CEPH_NOSNAP &&
 679                     (le32_to_cpu(info->cap.caps) & CEPH_CAP_FILE_SHARED) &&
 680                     (ci->i_ceph_flags & CEPH_I_COMPLETE) == 0) {
 681                         dout(" marking %p complete (empty)\n", inode);
 682                         ci->i_ceph_flags |= CEPH_I_COMPLETE;
 683                         ci->i_max_offset = 2;
 684                 }
 685
 686                 /* it may be better to set st_size in getattr instead? */
 687                 if (ceph_test_opt(ceph_sb_to_client(inode->i_sb), RBYTES))
 688                         inode->i_size = ci->i_rbytes;
 689                 break;
 690         default:
 691                 pr_err("fill_inode %llx.%llx BAD mode 0%o\n",
 692                        ceph_vinop(inode), inode->i_mode);
 693         }
 694
 695 no_change:
 696         spin_unlock(&inode->i_lock);
 697
 698         /* queue truncate if we saw i_size decrease */
 699         if (queue_trunc)
 700                 ceph_queue_vmtruncate(inode);
 701
 702         /* populate frag tree */
 703         /* FIXME: move me up, if/when version reflects fragtree changes */
 704         nsplits = le32_to_cpu(info->fragtree.nsplits);
 705         mutex_lock(&ci->i_fragtree_mutex);
 706         for (i = 0; i < nsplits; i++) {
 707                 u32 id = le32_to_cpu(info->fragtree.splits[i].frag);
 708                 struct ceph_inode_frag *frag = __get_or_create_frag(ci, id);
 709
 710                 if (IS_ERR(frag))
 711                         continue;
 712                 frag->split_by = le32_to_cpu(info->fragtree.splits[i].by);
 713                 dout(" frag %x split by %d\n", frag->frag, frag->split_by);
 714         }
 715         mutex_unlock(&ci->i_fragtree_mutex);
 716
 717         /* were we issued a capability? */
 718         if (info->cap.caps) {
 719                 if (ceph_snap(inode) == CEPH_NOSNAP) {
 720                         ceph_add_cap(inode, session,
 721                                      le64_to_cpu(info->cap.cap_id),
 722                                      cap_fmode,
 723                                      le32_to_cpu(info->cap.caps),
 724                                      le32_to_cpu(info->cap.wanted),
 725                                      le32_to_cpu(info->cap.seq),
 726                                      le32_to_cpu(info->cap.mseq),
 727                                      le64_to_cpu(info->cap.realm),
 728                                      info->cap.flags,
 729                                      caps_reservation);
 730                 } else {
 731                         spin_lock(&inode->i_lock);
 732                         dout(" %p got snap_caps %s\n", inode,
 733                              ceph_cap_string(le32_to_cpu(info->cap.caps)));
 734                         ci->i_snap_caps |= le32_to_cpu(info->cap.caps);
 735                         if (cap_fmode >= 0)
 736                                 __ceph_get_fmode(ci, cap_fmode);
 737                         spin_unlock(&inode->i_lock);
 738                 }
 739         } else if (cap_fmode >= 0) {
 740                 pr_warning("mds issued no caps on %llx.%llx\n",
 741                            ceph_vinop(inode));
 742                 __ceph_get_fmode(ci, cap_fmode);
 743         }
 744
 745         /* update delegation info? */
 746         if (dirinfo)
 747                 ceph_fill_dirfrag(inode, dirinfo);
 748
 749         err = 0;
 750
 751 out:
 752         if (xattr_blob)
 753                 ceph_buffer_put(xattr_blob);
 754         return err;
 755 }
 756
 757 /*
 758  * caller should hold session s_mutex.
 759  */
 760 static void update_dentry_lease(struct dentry *dentry,
 761                                 struct ceph_mds_reply_lease *lease,
 762                                 struct ceph_mds_session *session,
 763                                 unsigned long from_time)
 764 {
 765         struct ceph_dentry_info *di = ceph_dentry(dentry);
 766         long unsigned duration = le32_to_cpu(lease->duration_ms);
 767         long unsigned ttl = from_time + (duration * HZ) / 1000;
 768         long unsigned half_ttl = from_time + (duration * HZ / 2) / 1000;
 769         struct inode *dir;
 770
 771         /* only track leases on regular dentries */
 772         if (dentry->d_op != &ceph_dentry_ops)
 773                 return;
 774
 775         spin_lock(&dentry->d_lock);
 776         dout("update_dentry_lease %p mask %d duration %lu ms ttl %lu\n",
 777              dentry, le16_to_cpu(lease->mask), duration, ttl);
 778
 779         /* make lease_rdcache_gen match directory */
 780         dir = dentry->d_parent->d_inode;
 781         di->lease_shared_gen = ceph_inode(dir)->i_shared_gen;
 782
 783         if (lease->mask == 0)
 784                 goto out_unlock;
 785
 786         if (di->lease_gen == session->s_cap_gen &&
 787             time_before(ttl, dentry->d_time))
 788                 goto out_unlock;  /* we already have a newer lease. */
 789
 790         if (di->lease_session && di->lease_session != session)
 791                 goto out_unlock;
 792
 793         ceph_dentry_lru_touch(dentry);
 794
 795         if (!di->lease_session)
 796                 di->lease_session = ceph_get_mds_session(session);
 797         di->lease_gen = session->s_cap_gen;
 798         di->lease_seq = le32_to_cpu(lease->seq);
 799         di->lease_renew_after = half_ttl;
 800         di->lease_renew_from = 0;
 801         dentry->d_time = ttl;
 802 out_unlock:
 803         spin_unlock(&dentry->d_lock);
 804         return;
 805 }
 806
 807 /*
 808  * Set dentry's directory position based on the current dir's max, and
 809  * order it in d_subdirs, so that dcache_readdir behaves.
 810  */
 811 static void ceph_set_dentry_offset(struct dentry *dn)
 812 {
 813         struct dentry *dir = dn->d_parent;
 814         struct inode *inode = dn->d_parent->d_inode;
 815         struct ceph_dentry_info *di;
 816
 817         BUG_ON(!inode);
 818
 819         di = ceph_dentry(dn);
 820
 821         spin_lock(&inode->i_lock);
 822         if ((ceph_inode(inode)->i_ceph_flags & CEPH_I_COMPLETE) == 0) {
 823                 spin_unlock(&inode->i_lock);
 824                 return;
 825         }
 826         di->offset = ceph_inode(inode)->i_max_offset++;
 827         spin_unlock(&inode->i_lock);
 828
 829         spin_lock(&dcache_lock);
 830         spin_lock(&dn->d_lock);
 831         list_move(&dn->d_u.d_child, &dir->d_subdirs);
 832         dout("set_dentry_offset %p %lld (%p %p)\n", dn, di->offset,
 833              dn->d_u.d_child.prev, dn->d_u.d_child.next);
 834         spin_unlock(&dn->d_lock);
 835         spin_unlock(&dcache_lock);
 836 }
 837
 838 /*
 839  * splice a dentry to an inode.
 840  * caller must hold directory i_mutex for this to be safe.
 841  *
 842  * we will only rehash the resulting dentry if @prehash is
 843  * true; @prehash will be set to false (for the benefit of
 844  * the caller) if we fail.
 845  */
 846 static struct dentry *splice_dentry(struct dentry *dn, struct inode *in,
 847                                     bool *prehash)
 848 {
 849         struct dentry *realdn;
 850
 851         BUG_ON(dn->d_inode);
 852
 853         /* dn must be unhashed */
 854         if (!d_unhashed(dn))
 855                 d_drop(dn);
 856         realdn = d_materialise_unique(dn, in);
 857         if (IS_ERR(realdn)) {
 858                 pr_err("splice_dentry error %ld %p inode %p ino %llx.%llx\n",
 859                        PTR_ERR(realdn), dn, in, ceph_vinop(in));
 860                 if (prehash)
 861                         *prehash = false; /* don't rehash on error */
 862                 dn = realdn; /* note realdn contains the error */
 863                 goto out;
 864         } else if (realdn) {
 865                 dout("dn %p (%d) spliced with %p (%d) "
 866                      "inode %p ino %llx.%llx\n",
 867                      dn, atomic_read(&dn->d_count),
 868                      realdn, atomic_read(&realdn->d_count),
 869                      realdn->d_inode, ceph_vinop(realdn->d_inode));
 870                 dput(dn);
 871                 dn = realdn;
 872         } else {
 873                 BUG_ON(!ceph_dentry(dn));
 874                 dout("dn %p attached to %p ino %llx.%llx\n",
 875                      dn, dn->d_inode, ceph_vinop(dn->d_inode));
 876         }
 877         if ((!prehash || *prehash) && d_unhashed(dn))
 878                 d_rehash(dn);
 879         ceph_set_dentry_offset(dn);
 880 out:
 881         return dn;
 882 }
 883
 884 /*
 885  * Incorporate results into the local cache.  This is either just
 886  * one inode, or a directory, dentry, and possibly linked-to inode (e.g.,
 887  * after a lookup).
 888  *
 889  * A reply may contain
 890  *         a directory inode along with a dentry.
 891  *  and/or a target inode
 892  *
 893  * Called with snap_rwsem (read).
 894  */
 895 int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req,
 896                     struct ceph_mds_session *session)
 897 {
 898         struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
 899         struct inode *in = NULL;
 900         struct ceph_mds_reply_inode *ininfo;
 901         struct ceph_vino vino;
 902         struct ceph_client *client = ceph_sb_to_client(sb);
 903         int i = 0;
 904         int err = 0;
 905
 906         dout("fill_trace %p is_dentry %d is_target %d\n", req,
 907              rinfo->head->is_dentry, rinfo->head->is_target);
 908
 909 #if 0
 910         /*
 911          * Debugging hook:
 912          *
 913          * If we resend completed ops to a recovering mds, we get no
 914          * trace.  Since that is very rare, pretend this is the case
 915          * to ensure the 'no trace' handlers in the callers behave.
 916          *
 917          * Fill in inodes unconditionally to avoid breaking cap
 918          * invariants.
 919          */
 920         if (rinfo->head->op & CEPH_MDS_OP_WRITE) {
 921                 pr_info("fill_trace faking empty trace on %lld %s\n",
 922                         req->r_tid, ceph_mds_op_name(rinfo->head->op));
 923                 if (rinfo->head->is_dentry) {
 924                         rinfo->head->is_dentry = 0;
 925                         err = fill_inode(req->r_locked_dir,
 926                                          &rinfo->diri, rinfo->dirfrag,
 927                                          session, req->r_request_started, -1);
 928                 }
 929                 if (rinfo->head->is_target) {
 930                         rinfo->head->is_target = 0;
 931                         ininfo = rinfo->targeti.in;
 932                         vino.ino = le64_to_cpu(ininfo->ino);
 933                         vino.snap = le64_to_cpu(ininfo->snapid);
 934                         in = ceph_get_inode(sb, vino);
 935                         err = fill_inode(in, &rinfo->targeti, NULL,
 936                                          session, req->r_request_started,
 937                                          req->r_fmode);
 938                         iput(in);
 939                 }
 940         }
 941 #endif
 942
 943         if (!rinfo->head->is_target && !rinfo->head->is_dentry) {
 944                 dout("fill_trace reply is empty!\n");
 945                 if (rinfo->head->result == 0 && req->r_locked_dir)
 946                         ceph_invalidate_dir_request(req);
 947                 return 0;
 948         }
 949
 950         if (rinfo->head->is_dentry) {
 951                 struct inode *dir = req->r_locked_dir;
 952
 953                 err = fill_inode(dir, &rinfo->diri, rinfo->dirfrag,
 954                                  session, req->r_request_started, -1,
 955                                  &req->r_caps_reservation);
 956                 if (err < 0)
 957                         return err;
 958         }
 959
 960         /*
 961          * ignore null lease/binding on snapdir ENOENT, or else we
 962          * will have trouble splicing in the virtual snapdir later
 963          */
 964         if (rinfo->head->is_dentry && !req->r_aborted &&
 965             (rinfo->head->is_target || strncmp(req->r_dentry->d_name.name,
 966                                                client->mount_args->snapdir_name,
 967                                                req->r_dentry->d_name.len))) {
 968                 /*
 969                  * lookup link rename   : null -> possibly existing inode
 970                  * mknod symlink mkdir  : null -> new inode
 971                  * unlink               : linked -> null
 972                  */
 973                 struct inode *dir = req->r_locked_dir;
 974                 struct dentry *dn = req->r_dentry;
 975                 bool have_dir_cap, have_lease;
 976
 977                 BUG_ON(!dn);
 978                 BUG_ON(!dir);
 979                 BUG_ON(dn->d_parent->d_inode != dir);
 980                 BUG_ON(ceph_ino(dir) !=
 981                        le64_to_cpu(rinfo->diri.in->ino));
 982                 BUG_ON(ceph_snap(dir) !=
 983                        le64_to_cpu(rinfo->diri.in->snapid));
 984
 985                 /* do we have a lease on the whole dir? */
 986                 have_dir_cap =
 987                         (le32_to_cpu(rinfo->diri.in->cap.caps) &
 988                          CEPH_CAP_FILE_SHARED);
 989
 990                 /* do we have a dn lease? */
 991                 have_lease = have_dir_cap ||
 992                         (le16_to_cpu(rinfo->dlease->mask) &
 993                          CEPH_LOCK_DN);
 994
 995                 if (!have_lease)
 996                         dout("fill_trace  no dentry lease or dir cap\n");
 997
 998                 /* rename? */
 999                 if (req->r_old_dentry && req->r_op == CEPH_MDS_OP_RENAME) {
1000                         dout(" src %p '%.*s' dst %p '%.*s'\n",
1001                              req->r_old_dentry,
1002                              req->r_old_dentry->d_name.len,
1003                              req->r_old_dentry->d_name.name,
1004                              dn, dn->d_name.len, dn->d_name.name);
1005                         dout("fill_trace doing d_move %p -> %p\n",
1006                              req->r_old_dentry, dn);
1007
1008                         /* d_move screws up d_subdirs order */
1009                         ceph_i_clear(dir, CEPH_I_COMPLETE);
1010
1011                         d_move(req->r_old_dentry, dn);
1012                         dout(" src %p '%.*s' dst %p '%.*s'\n",
1013                              req->r_old_dentry,
1014                              req->r_old_dentry->d_name.len,
1015                              req->r_old_dentry->d_name.name,
1016                              dn, dn->d_name.len, dn->d_name.name);
1017
1018                         /* ensure target dentry is invalidated, despite
1019                            rehashing bug in vfs_rename_dir */
1020                         ceph_invalidate_dentry_lease(dn);
1021
1022                         /* take overwritten dentry's readdir offset */
1023                         dout("dn %p gets %p offset %lld (old offset %lld)\n",
1024                              req->r_old_dentry, dn, ceph_dentry(dn)->offset,
1025                              ceph_dentry(req->r_old_dentry)->offset);
1026                         ceph_dentry(req->r_old_dentry)->offset =
1027                                 ceph_dentry(dn)->offset;
1028
1029                         dn = req->r_old_dentry;  /* use old_dentry */
1030                         in = dn->d_inode;
1031                 }
1032
1033                 /* null dentry? */
1034                 if (!rinfo->head->is_target) {
1035                         dout("fill_trace null dentry\n");
1036                         if (dn->d_inode) {
1037                                 dout("d_delete %p\n", dn);
1038                                 d_delete(dn);
1039                         } else {
1040                                 dout("d_instantiate %p NULL\n", dn);
1041                                 d_instantiate(dn, NULL);
1042                                 if (have_lease && d_unhashed(dn))
1043                                         d_rehash(dn);
1044                                 update_dentry_lease(dn, rinfo->dlease,
1045                                                     session,
1046                                                     req->r_request_started);
1047                         }
1048                         goto done;
1049                 }
1050
1051                 /* attach proper inode */
1052                 ininfo = rinfo->targeti.in;
1053                 vino.ino = le64_to_cpu(ininfo->ino);
1054                 vino.snap = le64_to_cpu(ininfo->snapid);
1055                 if (!dn->d_inode) {
1056                         in = ceph_get_inode(sb, vino);
1057                         if (IS_ERR(in)) {
1058                                 pr_err("fill_trace bad get_inode "
1059                                        "%llx.%llx\n", vino.ino, vino.snap);
1060                                 err = PTR_ERR(in);
1061                                 d_delete(dn);
1062                                 goto done;
1063                         }
1064                         dn = splice_dentry(dn, in, &have_lease);
1065                         if (IS_ERR(dn)) {
1066                                 err = PTR_ERR(dn);
1067                                 goto done;
1068                         }
1069                         req->r_dentry = dn;  /* may have spliced */
1070                         igrab(in);
1071                 } else if (ceph_ino(in) == vino.ino &&
1072                            ceph_snap(in) == vino.snap) {
1073                         igrab(in);
1074                 } else {
1075                         dout(" %p links to %p %llx.%llx, not %llx.%llx\n",
1076                              dn, in, ceph_ino(in), ceph_snap(in),
1077                              vino.ino, vino.snap);
1078                         have_lease = false;
1079                         in = NULL;
1080                 }
1081
1082                 if (have_lease)
1083                         update_dentry_lease(dn, rinfo->dlease, session,
1084                                             req->r_request_started);
1085                 dout(" final dn %p\n", dn);
1086                 i++;
1087         } else if (req->r_op == CEPH_MDS_OP_LOOKUPSNAP ||
1088                    req->r_op == CEPH_MDS_OP_MKSNAP) {
1089                 struct dentry *dn = req->r_dentry;
1090
1091                 /* fill out a snapdir LOOKUPSNAP dentry */
1092                 BUG_ON(!dn);
1093                 BUG_ON(!req->r_locked_dir);
1094                 BUG_ON(ceph_snap(req->r_locked_dir) != CEPH_SNAPDIR);
1095                 ininfo = rinfo->targeti.in;
1096                 vino.ino = le64_to_cpu(ininfo->ino);
1097                 vino.snap = le64_to_cpu(ininfo->snapid);
1098                 in = ceph_get_inode(sb, vino);
1099                 if (IS_ERR(in)) {
1100                         pr_err("fill_inode get_inode badness %llx.%llx\n",
1101                                vino.ino, vino.snap);
1102                         err = PTR_ERR(in);
1103                         d_delete(dn);
1104                         goto done;
1105                 }
1106                 dout(" linking snapped dir %p to dn %p\n", in, dn);
1107                 dn = splice_dentry(dn, in, NULL);
1108                 if (IS_ERR(dn)) {
1109                         err = PTR_ERR(dn);
1110                         goto done;
1111                 }
1112                 req->r_dentry = dn;  /* may have spliced */
1113                 igrab(in);
1114                 rinfo->head->is_dentry = 1;  /* fool notrace handlers */
1115         }
1116
1117         if (rinfo->head->is_target) {
1118                 vino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1119                 vino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1120
1121                 if (in == NULL || ceph_ino(in) != vino.ino ||
1122                     ceph_snap(in) != vino.snap) {
1123                         in = ceph_get_inode(sb, vino);
1124                         if (IS_ERR(in)) {
1125                                 err = PTR_ERR(in);
1126                                 goto done;
1127                         }
1128                 }
1129                 req->r_target_inode = in;
1130
1131                 err = fill_inode(in,
1132                                  &rinfo->targeti, NULL,
1133                                  session, req->r_request_started,
1134                                  (le32_to_cpu(rinfo->head->result) == 0) ?
1135                                  req->r_fmode : -1,
1136                                  &req->r_caps_reservation);
1137                 if (err < 0) {
1138                         pr_err("fill_inode badness %p %llx.%llx\n",
1139                                in, ceph_vinop(in));
1140                         goto done;
1141                 }
1142         }
1143
1144 done:
1145         dout("fill_trace done err=%d\n", err);
1146         return err;
1147 }
1148
1149 /*
1150  * Prepopulate our cache with readdir results, leases, etc.
1151  */
1152 int ceph_readdir_prepopulate(struct ceph_mds_request *req,
1153                              struct ceph_mds_session *session)
1154 {
1155         struct dentry *parent = req->r_dentry;
1156         struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1157         struct qstr dname;
1158         struct dentry *dn;
1159         struct inode *in;
1160         int err = 0, i;
1161         struct inode *snapdir = NULL;
1162         struct ceph_mds_request_head *rhead = req->r_request->front.iov_base;
1163         u64 frag = le32_to_cpu(rhead->args.readdir.frag);
1164         struct ceph_dentry_info *di;
1165
1166         if (le32_to_cpu(rinfo->head->op) == CEPH_MDS_OP_LSSNAP) {
1167                 snapdir = ceph_get_snapdir(parent->d_inode);
1168                 parent = d_find_alias(snapdir);
1169                 dout("readdir_prepopulate %d items under SNAPDIR dn %p\n",
1170                      rinfo->dir_nr, parent);
1171         } else {
1172                 dout("readdir_prepopulate %d items under dn %p\n",
1173                      rinfo->dir_nr, parent);
1174                 if (rinfo->dir_dir)
1175                         ceph_fill_dirfrag(parent->d_inode, rinfo->dir_dir);
1176         }
1177
1178         for (i = 0; i < rinfo->dir_nr; i++) {
1179                 struct ceph_vino vino;
1180
1181                 dname.name = rinfo->dir_dname[i];
1182                 dname.len = rinfo->dir_dname_len[i];
1183                 dname.hash = full_name_hash(dname.name, dname.len);
1184
1185                 vino.ino = le64_to_cpu(rinfo->dir_in[i].in->ino);
1186                 vino.snap = le64_to_cpu(rinfo->dir_in[i].in->snapid);
1187
1188 retry_lookup:
1189                 dn = d_lookup(parent, &dname);
1190                 dout("d_lookup on parent=%p name=%.*s got %p\n",
1191                      parent, dname.len, dname.name, dn);
1192
1193                 if (!dn) {
1194                         dn = d_alloc(parent, &dname);
1195                         dout("d_alloc %p '%.*s' = %p\n", parent,
1196                              dname.len, dname.name, dn);
1197                         if (dn == NULL) {
1198                                 dout("d_alloc badness\n");
1199                                 err = -ENOMEM;
1200                                 goto out;
1201                         }
1202                         err = ceph_init_dentry(dn);
1203                         if (err < 0) {
1204                                 dput(dn);
1205                                 goto out;
1206                         }
1207                 } else if (dn->d_inode &&
1208                            (ceph_ino(dn->d_inode) != vino.ino ||
1209                             ceph_snap(dn->d_inode) != vino.snap)) {
1210                         dout(" dn %p points to wrong inode %p\n",
1211                              dn, dn->d_inode);
1212                         d_delete(dn);
1213                         dput(dn);
1214                         goto retry_lookup;
1215                 } else {
1216                         /* reorder parent's d_subdirs */
1217                         spin_lock(&dcache_lock);
1218                         spin_lock(&dn->d_lock);
1219                         list_move(&dn->d_u.d_child, &parent->d_subdirs);
1220                         spin_unlock(&dn->d_lock);
1221                         spin_unlock(&dcache_lock);
1222                 }
1223
1224                 di = dn->d_fsdata;
1225                 di->offset = ceph_make_fpos(frag, i + req->r_readdir_offset);
1226
1227                 /* inode */
1228                 if (dn->d_inode) {
1229                         in = dn->d_inode;
1230                 } else {
1231                         in = ceph_get_inode(parent->d_sb, vino);
1232                         if (in == NULL) {
1233                                 dout("new_inode badness\n");
1234                                 d_delete(dn);
1235                                 dput(dn);
1236                                 err = -ENOMEM;
1237                                 goto out;
1238                         }
1239                         dn = splice_dentry(dn, in, NULL);
1240                         if (IS_ERR(dn))
1241                                 dn = NULL;
1242                 }
1243
1244                 if (fill_inode(in, &rinfo->dir_in[i], NULL, session,
1245                                req->r_request_started, -1,
1246                                &req->r_caps_reservation) < 0) {
1247                         pr_err("fill_inode badness on %p\n", in);
1248                         goto next_item;
1249                 }
1250                 if (dn)
1251                         update_dentry_lease(dn, rinfo->dir_dlease[i],
1252                                             req->r_session,
1253                                             req->r_request_started);
1254 next_item:
1255                 if (dn)
1256                         dput(dn);
1257         }
1258         req->r_did_prepopulate = true;
1259
1260 out:
1261         if (snapdir) {
1262                 iput(snapdir);
1263                 dput(parent);
1264         }
1265         dout("readdir_prepopulate done\n");
1266         return err;
1267 }
1268
1269 int ceph_inode_set_size(struct inode *inode, loff_t size)
1270 {
1271         struct ceph_inode_info *ci = ceph_inode(inode);
1272         int ret = 0;
1273
1274         spin_lock(&inode->i_lock);
1275         dout("set_size %p %llu -> %llu\n", inode, inode->i_size, size);
1276         inode->i_size = size;
1277         inode->i_blocks = (size + (1 << 9) - 1) >> 9;
1278
1279         /* tell the MDS if we are approaching max_size */
1280         if ((size << 1) >= ci->i_max_size &&
1281             (ci->i_reported_size << 1) < ci->i_max_size)
1282                 ret = 1;
1283
1284         spin_unlock(&inode->i_lock);
1285         return ret;
1286 }
1287
1288 /*
1289  * Write back inode data in a worker thread.  (This can't be done
1290  * in the message handler context.)
1291  */
1292 void ceph_queue_writeback(struct inode *inode)
1293 {
1294         if (queue_work(ceph_inode_to_client(inode)->wb_wq,
1295                        &ceph_inode(inode)->i_wb_work)) {
1296                 dout("ceph_queue_writeback %p\n", inode);
1297                 igrab(inode);
1298         } else {
1299                 dout("ceph_queue_writeback %p failed\n", inode);
1300         }
1301 }
1302
1303 static void ceph_writeback_work(struct work_struct *work)
1304 {
1305         struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1306                                                   i_wb_work);
1307         struct inode *inode = &ci->vfs_inode;
1308
1309         dout("writeback %p\n", inode);
1310         filemap_fdatawrite(&inode->i_data);
1311         iput(inode);
1312 }
1313
1314 /*
1315  * queue an async invalidation
1316  */
1317 void ceph_queue_invalidate(struct inode *inode)
1318 {
1319         if (queue_work(ceph_inode_to_client(inode)->pg_inv_wq,
1320                        &ceph_inode(inode)->i_pg_inv_work)) {
1321                 dout("ceph_queue_invalidate %p\n", inode);
1322                 igrab(inode);
1323         } else {
1324                 dout("ceph_queue_invalidate %p failed\n", inode);
1325         }
1326 }
1327
1328 /*
1329  * invalidate any pages that are not dirty or under writeback.  this
1330  * includes pages that are clean and mapped.
1331  */
1332 static void ceph_invalidate_nondirty_pages(struct address_space *mapping)
1333 {
1334         struct pagevec pvec;
1335         pgoff_t next = 0;
1336         int i;
1337
1338         pagevec_init(&pvec, 0);
1339         while (pagevec_lookup(&pvec, mapping, next, PAGEVEC_SIZE)) {
1340                 for (i = 0; i < pagevec_count(&pvec); i++) {
1341                         struct page *page = pvec.pages[i];
1342                         pgoff_t index;
1343                         int skip_page =
1344                                 (PageDirty(page) || PageWriteback(page));
1345
1346                         if (!skip_page)
1347                                 skip_page = !trylock_page(page);
1348
1349                         /*
1350                          * We really shouldn't be looking at the ->index of an
1351                          * unlocked page.  But we're not allowed to lock these
1352                          * pages.  So we rely upon nobody altering the ->index
1353                          * of this (pinned-by-us) page.
1354                          */
1355                         index = page->index;
1356                         if (index > next)
1357                                 next = index;
1358                         next++;
1359
1360                         if (skip_page)
1361                                 continue;
1362
1363                         generic_error_remove_page(mapping, page);
1364                         unlock_page(page);
1365                 }
1366                 pagevec_release(&pvec);
1367                 cond_resched();
1368         }
1369 }
1370
1371 /*
1372  * Invalidate inode pages in a worker thread.  (This can't be done
1373  * in the message handler context.)
1374  */
1375 static void ceph_invalidate_work(struct work_struct *work)
1376 {
1377         struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1378                                                   i_pg_inv_work);
1379         struct inode *inode = &ci->vfs_inode;
1380         u32 orig_gen;
1381         int check = 0;
1382
1383         spin_lock(&inode->i_lock);
1384         dout("invalidate_pages %p gen %d revoking %d\n", inode,
1385              ci->i_rdcache_gen, ci->i_rdcache_revoking);
1386         if (ci->i_rdcache_gen == 0 ||
1387             ci->i_rdcache_revoking != ci->i_rdcache_gen) {
1388                 BUG_ON(ci->i_rdcache_revoking > ci->i_rdcache_gen);
1389                 /* nevermind! */
1390                 ci->i_rdcache_revoking = 0;
1391                 spin_unlock(&inode->i_lock);
1392                 goto out;
1393         }
1394         orig_gen = ci->i_rdcache_gen;
1395         spin_unlock(&inode->i_lock);
1396
1397         ceph_invalidate_nondirty_pages(inode->i_mapping);
1398
1399         spin_lock(&inode->i_lock);
1400         if (orig_gen == ci->i_rdcache_gen) {
1401                 dout("invalidate_pages %p gen %d successful\n", inode,
1402                      ci->i_rdcache_gen);
1403                 ci->i_rdcache_gen = 0;
1404                 ci->i_rdcache_revoking = 0;
1405                 check = 1;
1406         } else {
1407                 dout("invalidate_pages %p gen %d raced, gen now %d\n",
1408                      inode, orig_gen, ci->i_rdcache_gen);
1409         }
1410         spin_unlock(&inode->i_lock);
1411
1412         if (check)
1413                 ceph_check_caps(ci, 0, NULL);
1414 out:
1415         iput(inode);
1416 }
1417
1418
1419 /*
1420  * called by trunc_wq; take i_mutex ourselves
1421  *
1422  * We also truncate in a separate thread as well.
1423  */
1424 static void ceph_vmtruncate_work(struct work_struct *work)
1425 {
1426         struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1427                                                   i_vmtruncate_work);
1428         struct inode *inode = &ci->vfs_inode;
1429
1430         dout("vmtruncate_work %p\n", inode);
1431         mutex_lock(&inode->i_mutex);
1432         __ceph_do_pending_vmtruncate(inode);
1433         mutex_unlock(&inode->i_mutex);
1434         iput(inode);
1435 }
1436
1437 /*
1438  * Queue an async vmtruncate.  If we fail to queue work, we will handle
1439  * the truncation the next time we call __ceph_do_pending_vmtruncate.
1440  */
1441 void ceph_queue_vmtruncate(struct inode *inode)
1442 {
1443         struct ceph_inode_info *ci = ceph_inode(inode);
1444
1445         if (queue_work(ceph_sb_to_client(inode->i_sb)->trunc_wq,
1446                        &ci->i_vmtruncate_work)) {
1447                 dout("ceph_queue_vmtruncate %p\n", inode);
1448                 igrab(inode);
1449         } else {
1450                 dout("ceph_queue_vmtruncate %p failed, pending=%d\n",
1451                      inode, ci->i_truncate_pending);
1452         }
1453 }
1454
1455 /*
1456  * called with i_mutex held.
1457  *
1458  * Make sure any pending truncation is applied before doing anything
1459  * that may depend on it.
1460  */
1461 void __ceph_do_pending_vmtruncate(struct inode *inode)
1462 {
1463         struct ceph_inode_info *ci = ceph_inode(inode);
1464         u64 to;
1465         int wrbuffer_refs, wake = 0;
1466
1467 retry:
1468         spin_lock(&inode->i_lock);
1469         if (ci->i_truncate_pending == 0) {
1470                 dout("__do_pending_vmtruncate %p none pending\n", inode);
1471                 spin_unlock(&inode->i_lock);
1472                 return;
1473         }
1474
1475         /*
1476          * make sure any dirty snapped pages are flushed before we
1477          * possibly truncate them.. so write AND block!
1478          */
1479         if (ci->i_wrbuffer_ref_head < ci->i_wrbuffer_ref) {
1480                 dout("__do_pending_vmtruncate %p flushing snaps first\n",
1481                      inode);
1482                 spin_unlock(&inode->i_lock);
1483                 filemap_write_and_wait_range(&inode->i_data, 0,
1484                                              inode->i_sb->s_maxbytes);
1485                 goto retry;
1486         }
1487
1488         to = ci->i_truncate_size;
1489         wrbuffer_refs = ci->i_wrbuffer_ref;
1490         dout("__do_pending_vmtruncate %p (%d) to %lld\n", inode,
1491              ci->i_truncate_pending, to);
1492         spin_unlock(&inode->i_lock);
1493
1494         truncate_inode_pages(inode->i_mapping, to);
1495
1496         spin_lock(&inode->i_lock);
1497         ci->i_truncate_pending--;
1498         if (ci->i_truncate_pending == 0)
1499                 wake = 1;
1500         spin_unlock(&inode->i_lock);
1501
1502         if (wrbuffer_refs == 0)
1503                 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
1504         if (wake)
1505                 wake_up_all(&ci->i_cap_wq);
1506 }
1507
1508
1509 /*
1510  * symlinks
1511  */
1512 static void *ceph_sym_follow_link(struct dentry *dentry, struct nameidata *nd)
1513 {
1514         struct ceph_inode_info *ci = ceph_inode(dentry->d_inode);
1515         nd_set_link(nd, ci->i_symlink);
1516         return NULL;
1517 }
1518
1519 static const struct inode_operations ceph_symlink_iops = {
1520         .readlink = generic_readlink,
1521         .follow_link = ceph_sym_follow_link,
1522 };
1523
1524 /*
1525  * setattr
1526  */
1527 int ceph_setattr(struct dentry *dentry, struct iattr *attr)
1528 {
1529         struct inode *inode = dentry->d_inode;
1530         struct ceph_inode_info *ci = ceph_inode(inode);
1531         struct inode *parent_inode = dentry->d_parent->d_inode;
1532         const unsigned int ia_valid = attr->ia_valid;
1533         struct ceph_mds_request *req;
1534         struct ceph_mds_client *mdsc = &ceph_sb_to_client(dentry->d_sb)->mdsc;
1535         int issued;
1536         int release = 0, dirtied = 0;
1537         int mask = 0;
1538         int err = 0;
1539
1540         if (ceph_snap(inode) != CEPH_NOSNAP)
1541                 return -EROFS;
1542
1543         __ceph_do_pending_vmtruncate(inode);
1544
1545         err = inode_change_ok(inode, attr);
1546         if (err != 0)
1547                 return err;
1548
1549         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETATTR,
1550                                        USE_AUTH_MDS);
1551         if (IS_ERR(req))
1552                 return PTR_ERR(req);
1553
1554         spin_lock(&inode->i_lock);
1555         issued = __ceph_caps_issued(ci, NULL);
1556         dout("setattr %p issued %s\n", inode, ceph_cap_string(issued));
1557
1558         if (ia_valid & ATTR_UID) {
1559                 dout("setattr %p uid %d -> %d\n", inode,
1560                      inode->i_uid, attr->ia_uid);
1561                 if (issued & CEPH_CAP_AUTH_EXCL) {
1562                         inode->i_uid = attr->ia_uid;
1563                         dirtied |= CEPH_CAP_AUTH_EXCL;
1564                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1565                            attr->ia_uid != inode->i_uid) {
1566                         req->r_args.setattr.uid = cpu_to_le32(attr->ia_uid);
1567                         mask |= CEPH_SETATTR_UID;
1568                         release |= CEPH_CAP_AUTH_SHARED;
1569                 }
1570         }
1571         if (ia_valid & ATTR_GID) {
1572                 dout("setattr %p gid %d -> %d\n", inode,
1573                      inode->i_gid, attr->ia_gid);
1574                 if (issued & CEPH_CAP_AUTH_EXCL) {
1575                         inode->i_gid = attr->ia_gid;
1576                         dirtied |= CEPH_CAP_AUTH_EXCL;
1577                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1578                            attr->ia_gid != inode->i_gid) {
1579                         req->r_args.setattr.gid = cpu_to_le32(attr->ia_gid);
1580                         mask |= CEPH_SETATTR_GID;
1581                         release |= CEPH_CAP_AUTH_SHARED;
1582                 }
1583         }
1584         if (ia_valid & ATTR_MODE) {
1585                 dout("setattr %p mode 0%o -> 0%o\n", inode, inode->i_mode,
1586                      attr->ia_mode);
1587                 if (issued & CEPH_CAP_AUTH_EXCL) {
1588                         inode->i_mode = attr->ia_mode;
1589                         dirtied |= CEPH_CAP_AUTH_EXCL;
1590                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1591                            attr->ia_mode != inode->i_mode) {
1592                         req->r_args.setattr.mode = cpu_to_le32(attr->ia_mode);
1593                         mask |= CEPH_SETATTR_MODE;
1594                         release |= CEPH_CAP_AUTH_SHARED;
1595                 }
1596         }
1597
1598         if (ia_valid & ATTR_ATIME) {
1599                 dout("setattr %p atime %ld.%ld -> %ld.%ld\n", inode,
1600                      inode->i_atime.tv_sec, inode->i_atime.tv_nsec,
1601                      attr->ia_atime.tv_sec, attr->ia_atime.tv_nsec);
1602                 if (issued & CEPH_CAP_FILE_EXCL) {
1603                         ci->i_time_warp_seq++;
1604                         inode->i_atime = attr->ia_atime;
1605                         dirtied |= CEPH_CAP_FILE_EXCL;
1606                 } else if ((issued & CEPH_CAP_FILE_WR) &&
1607                            timespec_compare(&inode->i_atime,
1608                                             &attr->ia_atime) < 0) {
1609                         inode->i_atime = attr->ia_atime;
1610                         dirtied |= CEPH_CAP_FILE_WR;
1611                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1612                            !timespec_equal(&inode->i_atime, &attr->ia_atime)) {
1613                         ceph_encode_timespec(&req->r_args.setattr.atime,
1614                                              &attr->ia_atime);
1615                         mask |= CEPH_SETATTR_ATIME;
1616                         release |= CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_RD |
1617                                 CEPH_CAP_FILE_WR;
1618                 }
1619         }
1620         if (ia_valid & ATTR_MTIME) {
1621                 dout("setattr %p mtime %ld.%ld -> %ld.%ld\n", inode,
1622                      inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
1623                      attr->ia_mtime.tv_sec, attr->ia_mtime.tv_nsec);
1624                 if (issued & CEPH_CAP_FILE_EXCL) {
1625                         ci->i_time_warp_seq++;
1626                         inode->i_mtime = attr->ia_mtime;
1627                         dirtied |= CEPH_CAP_FILE_EXCL;
1628                 } else if ((issued & CEPH_CAP_FILE_WR) &&
1629                            timespec_compare(&inode->i_mtime,
1630                                             &attr->ia_mtime) < 0) {
1631                         inode->i_mtime = attr->ia_mtime;
1632                         dirtied |= CEPH_CAP_FILE_WR;
1633                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1634                            !timespec_equal(&inode->i_mtime, &attr->ia_mtime)) {
1635                         ceph_encode_timespec(&req->r_args.setattr.mtime,
1636                                              &attr->ia_mtime);
1637                         mask |= CEPH_SETATTR_MTIME;
1638                         release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD |
1639                                 CEPH_CAP_FILE_WR;
1640                 }
1641         }
1642         if (ia_valid & ATTR_SIZE) {
1643                 dout("setattr %p size %lld -> %lld\n", inode,
1644                      inode->i_size, attr->ia_size);
1645                 if (attr->ia_size > inode->i_sb->s_maxbytes) {
1646                         err = -EINVAL;
1647                         goto out;
1648                 }
1649                 if ((issued & CEPH_CAP_FILE_EXCL) &&
1650                     attr->ia_size > inode->i_size) {
1651                         inode->i_size = attr->ia_size;
1652                         inode->i_blocks =
1653                                 (attr->ia_size + (1 << 9) - 1) >> 9;
1654                         inode->i_ctime = attr->ia_ctime;
1655                         ci->i_reported_size = attr->ia_size;
1656                         dirtied |= CEPH_CAP_FILE_EXCL;
1657                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1658                            attr->ia_size != inode->i_size) {
1659                         req->r_args.setattr.size = cpu_to_le64(attr->ia_size);
1660                         req->r_args.setattr.old_size =
1661                                 cpu_to_le64(inode->i_size);
1662                         mask |= CEPH_SETATTR_SIZE;
1663                         release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD |
1664                                 CEPH_CAP_FILE_WR;
1665                 }
1666         }
1667
1668         /* these do nothing */
1669         if (ia_valid & ATTR_CTIME) {
1670                 bool only = (ia_valid & (ATTR_SIZE|ATTR_MTIME|ATTR_ATIME|
1671                                          ATTR_MODE|ATTR_UID|ATTR_GID)) == 0;
1672                 dout("setattr %p ctime %ld.%ld -> %ld.%ld (%s)\n", inode,
1673                      inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
1674                      attr->ia_ctime.tv_sec, attr->ia_ctime.tv_nsec,
1675                      only ? "ctime only" : "ignored");
1676                 inode->i_ctime = attr->ia_ctime;
1677                 if (only) {
1678                         /*
1679                          * if kernel wants to dirty ctime but nothing else,
1680                          * we need to choose a cap to dirty under, or do
1681                          * a almost-no-op setattr
1682                          */
1683                         if (issued & CEPH_CAP_AUTH_EXCL)
1684                                 dirtied |= CEPH_CAP_AUTH_EXCL;
1685                         else if (issued & CEPH_CAP_FILE_EXCL)
1686                                 dirtied |= CEPH_CAP_FILE_EXCL;
1687                         else if (issued & CEPH_CAP_XATTR_EXCL)
1688                                 dirtied |= CEPH_CAP_XATTR_EXCL;
1689                         else
1690                                 mask |= CEPH_SETATTR_CTIME;
1691                 }
1692         }
1693         if (ia_valid & ATTR_FILE)
1694                 dout("setattr %p ATTR_FILE ... hrm!\n", inode);
1695
1696         if (dirtied) {
1697                 __ceph_mark_dirty_caps(ci, dirtied);
1698                 inode->i_ctime = CURRENT_TIME;
1699         }
1700
1701         release &= issued;
1702         spin_unlock(&inode->i_lock);
1703
1704         if (mask) {
1705                 req->r_inode = igrab(inode);
1706                 req->r_inode_drop = release;
1707                 req->r_args.setattr.mask = cpu_to_le32(mask);
1708                 req->r_num_caps = 1;
1709                 err = ceph_mdsc_do_request(mdsc, parent_inode, req);
1710         }
1711         dout("setattr %p result=%d (%s locally, %d remote)\n", inode, err,
1712              ceph_cap_string(dirtied), mask);
1713
1714         ceph_mdsc_put_request(req);
1715         __ceph_do_pending_vmtruncate(inode);
1716         return err;
1717 out:
1718         spin_unlock(&inode->i_lock);
1719         ceph_mdsc_put_request(req);
1720         return err;
1721 }
1722
1723 /*
1724  * Verify that we have a lease on the given mask.  If not,
1725  * do a getattr against an mds.
1726  */
1727 int ceph_do_getattr(struct inode *inode, int mask)
1728 {
1729         struct ceph_client *client = ceph_sb_to_client(inode->i_sb);
1730         struct ceph_mds_client *mdsc = &client->mdsc;
1731         struct ceph_mds_request *req;
1732         int err;
1733
1734         if (ceph_snap(inode) == CEPH_SNAPDIR) {
1735                 dout("do_getattr inode %p SNAPDIR\n", inode);
1736                 return 0;
1737         }
1738
1739         dout("do_getattr inode %p mask %s\n", inode, ceph_cap_string(mask));
1740         if (ceph_caps_issued_mask(ceph_inode(inode), mask, 1))
1741                 return 0;
1742
1743         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
1744         if (IS_ERR(req))
1745                 return PTR_ERR(req);
1746         req->r_inode = igrab(inode);
1747         req->r_num_caps = 1;
1748         req->r_args.getattr.mask = cpu_to_le32(mask);
1749         err = ceph_mdsc_do_request(mdsc, NULL, req);
1750         ceph_mdsc_put_request(req);
1751         dout("do_getattr result=%d\n", err);
1752         return err;
1753 }
1754
1755
1756 /*
1757  * Check inode permissions.  We verify we have a valid value for
1758  * the AUTH cap, then call the generic handler.
1759  */
1760 int ceph_permission(struct inode *inode, int mask)
1761 {
1762         int err = ceph_do_getattr(inode, CEPH_CAP_AUTH_SHARED);
1763
1764         if (!err)
1765                 err = generic_permission(inode, mask, NULL);
1766         return err;
1767 }
1768
1769 /*
1770  * Get all attributes.  Hopefully somedata we'll have a statlite()
1771  * and can limit the fields we require to be accurate.
1772  */
1773 int ceph_getattr(struct vfsmount *mnt, struct dentry *dentry,
1774                  struct kstat *stat)
1775 {
1776         struct inode *inode = dentry->d_inode;
1777         struct ceph_inode_info *ci = ceph_inode(inode);
1778         int err;
1779
1780         err = ceph_do_getattr(inode, CEPH_STAT_CAP_INODE_ALL);
1781         if (!err) {
1782                 generic_fillattr(inode, stat);
1783                 stat->ino = inode->i_ino;
1784                 if (ceph_snap(inode) != CEPH_NOSNAP)
1785                         stat->dev = ceph_snap(inode);
1786                 else
1787                         stat->dev = 0;
1788                 if (S_ISDIR(inode->i_mode)) {
1789                         stat->size = ci->i_rbytes;
1790                         stat->blocks = 0;
1791                         stat->blksize = 65536;
1792                 }
1793         }
1794         return err;
1795 }