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/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 "mds_client.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 struct inode *ceph_get_inode(struct super_block *sb, struct ceph_vino vino)
  41 {
  42         struct inode *inode;
  43         ino_t t = ceph_vino_to_ino(vino);
  44
  45         inode = iget5_locked(sb, t, ceph_ino_compare, ceph_set_ino_cb, &vino);
  46         if (inode == NULL)
  47                 return ERR_PTR(-ENOMEM);
  48         if (inode->i_state & I_NEW) {
  49                 dout("get_inode created new inode %p %llx.%llx ino %llx\n",
  50                      inode, ceph_vinop(inode), (u64)inode->i_ino);
  51                 unlock_new_inode(inode);
  52         }
  53
  54         dout("get_inode on %lu=%llx.%llx got %p\n", inode->i_ino, vino.ino,
  55              vino.snap, inode);
  56         return inode;
  57 }
  58
  59 /*
  60  * get/constuct snapdir inode for a given directory
  61  */
  62 struct inode *ceph_get_snapdir(struct inode *parent)
  63 {
  64         struct ceph_vino vino = {
  65                 .ino = ceph_ino(parent),
  66                 .snap = CEPH_SNAPDIR,
  67         };
  68         struct inode *inode = ceph_get_inode(parent->i_sb, vino);
  69         struct ceph_inode_info *ci = ceph_inode(inode);
  70
  71         BUG_ON(!S_ISDIR(parent->i_mode));
  72         if (IS_ERR(inode))
  73                 return inode;
  74         inode->i_mode = parent->i_mode;
  75         inode->i_uid = parent->i_uid;
  76         inode->i_gid = parent->i_gid;
  77         inode->i_op = &ceph_dir_iops;
  78         inode->i_fop = &ceph_dir_fops;
  79         ci->i_snap_caps = CEPH_CAP_PIN; /* so we can open */
  80         ci->i_rbytes = 0;
  81         return inode;
  82 }
  83
  84 const struct inode_operations ceph_file_iops = {
  85         .permission = ceph_permission,
  86         .setattr = ceph_setattr,
  87         .getattr = ceph_getattr,
  88         .setxattr = ceph_setxattr,
  89         .getxattr = ceph_getxattr,
  90         .listxattr = ceph_listxattr,
  91         .removexattr = ceph_removexattr,
  92 };
  93
  94
  95 /*
  96  * We use a 'frag tree' to keep track of the MDS's directory fragments
  97  * for a given inode (usually there is just a single fragment).  We
  98  * need to know when a child frag is delegated to a new MDS, or when
  99  * it is flagged as replicated, so we can direct our requests
 100  * accordingly.
 101  */
 102
 103 /*
 104  * find/create a frag in the tree
 105  */
 106 static struct ceph_inode_frag *__get_or_create_frag(struct ceph_inode_info *ci,
 107                                                     u32 f)
 108 {
 109         struct rb_node **p;
 110         struct rb_node *parent = NULL;
 111         struct ceph_inode_frag *frag;
 112         int c;
 113
 114         p = &ci->i_fragtree.rb_node;
 115         while (*p) {
 116                 parent = *p;
 117                 frag = rb_entry(parent, struct ceph_inode_frag, node);
 118                 c = ceph_frag_compare(f, frag->frag);
 119                 if (c < 0)
 120                         p = &(*p)->rb_left;
 121                 else if (c > 0)
 122                         p = &(*p)->rb_right;
 123                 else
 124                         return frag;
 125         }
 126
 127         frag = kmalloc(sizeof(*frag), GFP_NOFS);
 128         if (!frag) {
 129                 pr_err("__get_or_create_frag ENOMEM on %p %llx.%llx "
 130                        "frag %x\n", &ci->vfs_inode,
 131                        ceph_vinop(&ci->vfs_inode), f);
 132                 return ERR_PTR(-ENOMEM);
 133         }
 134         frag->frag = f;
 135         frag->split_by = 0;
 136         frag->mds = -1;
 137         frag->ndist = 0;
 138
 139         rb_link_node(&frag->node, parent, p);
 140         rb_insert_color(&frag->node, &ci->i_fragtree);
 141
 142         dout("get_or_create_frag added %llx.%llx frag %x\n",
 143              ceph_vinop(&ci->vfs_inode), f);
 144         return frag;
 145 }
 146
 147 /*
 148  * find a specific frag @f
 149  */
 150 struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci, u32 f)
 151 {
 152         struct rb_node *n = ci->i_fragtree.rb_node;
 153
 154         while (n) {
 155                 struct ceph_inode_frag *frag =
 156                         rb_entry(n, struct ceph_inode_frag, node);
 157                 int c = ceph_frag_compare(f, frag->frag);
 158                 if (c < 0)
 159                         n = n->rb_left;
 160                 else if (c > 0)
 161                         n = n->rb_right;
 162                 else
 163                         return frag;
 164         }
 165         return NULL;
 166 }
 167
 168 /*
 169  * Choose frag containing the given value @v.  If @pfrag is
 170  * specified, copy the frag delegation info to the caller if
 171  * it is present.
 172  */
 173 u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
 174                      struct ceph_inode_frag *pfrag,
 175                      int *found)
 176 {
 177         u32 t = ceph_frag_make(0, 0);
 178         struct ceph_inode_frag *frag;
 179         unsigned nway, i;
 180         u32 n;
 181
 182         if (found)
 183                 *found = 0;
 184
 185         mutex_lock(&ci->i_fragtree_mutex);
 186         while (1) {
 187                 WARN_ON(!ceph_frag_contains_value(t, v));
 188                 frag = __ceph_find_frag(ci, t);
 189                 if (!frag)
 190                         break; /* t is a leaf */
 191                 if (frag->split_by == 0) {
 192                         if (pfrag)
 193                                 memcpy(pfrag, frag, sizeof(*pfrag));
 194                         if (found)
 195                                 *found = 1;
 196                         break;
 197                 }
 198
 199                 /* choose child */
 200                 nway = 1 << frag->split_by;
 201                 dout("choose_frag(%x) %x splits by %d (%d ways)\n", v, t,
 202                      frag->split_by, nway);
 203                 for (i = 0; i < nway; i++) {
 204                         n = ceph_frag_make_child(t, frag->split_by, i);
 205                         if (ceph_frag_contains_value(n, v)) {
 206                                 t = n;
 207                                 break;
 208                         }
 209                 }
 210                 BUG_ON(i == nway);
 211         }
 212         dout("choose_frag(%x) = %x\n", v, t);
 213
 214         mutex_unlock(&ci->i_fragtree_mutex);
 215         return t;
 216 }
 217
 218 /*
 219  * Process dirfrag (delegation) info from the mds.  Include leaf
 220  * fragment in tree ONLY if ndist > 0.  Otherwise, only
 221  * branches/splits are included in i_fragtree)
 222  */
 223 static int ceph_fill_dirfrag(struct inode *inode,
 224                              struct ceph_mds_reply_dirfrag *dirinfo)
 225 {
 226         struct ceph_inode_info *ci = ceph_inode(inode);
 227         struct ceph_inode_frag *frag;
 228         u32 id = le32_to_cpu(dirinfo->frag);
 229         int mds = le32_to_cpu(dirinfo->auth);
 230         int ndist = le32_to_cpu(dirinfo->ndist);
 231         int i;
 232         int err = 0;
 233
 234         mutex_lock(&ci->i_fragtree_mutex);
 235         if (ndist == 0) {
 236                 /* no delegation info needed. */
 237                 frag = __ceph_find_frag(ci, id);
 238                 if (!frag)
 239                         goto out;
 240                 if (frag->split_by == 0) {
 241                         /* tree leaf, remove */
 242                         dout("fill_dirfrag removed %llx.%llx frag %x"
 243                              " (no ref)\n", ceph_vinop(inode), id);
 244                         rb_erase(&frag->node, &ci->i_fragtree);
 245                         kfree(frag);
 246                 } else {
 247                         /* tree branch, keep and clear */
 248                         dout("fill_dirfrag cleared %llx.%llx frag %x"
 249                              " referral\n", ceph_vinop(inode), id);
 250                         frag->mds = -1;
 251                         frag->ndist = 0;
 252                 }
 253                 goto out;
 254         }
 255
 256
 257         /* find/add this frag to store mds delegation info */
 258         frag = __get_or_create_frag(ci, id);
 259         if (IS_ERR(frag)) {
 260                 /* this is not the end of the world; we can continue
 261                    with bad/inaccurate delegation info */
 262                 pr_err("fill_dirfrag ENOMEM on mds ref %llx.%llx fg %x\n",
 263                        ceph_vinop(inode), le32_to_cpu(dirinfo->frag));
 264                 err = -ENOMEM;
 265                 goto out;
 266         }
 267
 268         frag->mds = mds;
 269         frag->ndist = min_t(u32, ndist, CEPH_MAX_DIRFRAG_REP);
 270         for (i = 0; i < frag->ndist; i++)
 271                 frag->dist[i] = le32_to_cpu(dirinfo->dist[i]);
 272         dout("fill_dirfrag %llx.%llx frag %x ndist=%d\n",
 273              ceph_vinop(inode), frag->frag, frag->ndist);
 274
 275 out:
 276         mutex_unlock(&ci->i_fragtree_mutex);
 277         return err;
 278 }
 279
 280
 281 /*
 282  * initialize a newly allocated inode.
 283  */
 284 struct inode *ceph_alloc_inode(struct super_block *sb)
 285 {
 286         struct ceph_inode_info *ci;
 287         int i;
 288
 289         ci = kmem_cache_alloc(ceph_inode_cachep, GFP_NOFS);
 290         if (!ci)
 291                 return NULL;
 292
 293         dout("alloc_inode %p\n", &ci->vfs_inode);
 294
 295         ci->i_version = 0;
 296         ci->i_time_warp_seq = 0;
 297         ci->i_ceph_flags = 0;
 298         ci->i_release_count = 0;
 299         ci->i_symlink = NULL;
 300
 301         ci->i_fragtree = RB_ROOT;
 302         mutex_init(&ci->i_fragtree_mutex);
 303
 304         ci->i_xattrs.blob = NULL;
 305         ci->i_xattrs.prealloc_blob = NULL;
 306         ci->i_xattrs.dirty = false;
 307         ci->i_xattrs.index = RB_ROOT;
 308         ci->i_xattrs.count = 0;
 309         ci->i_xattrs.names_size = 0;
 310         ci->i_xattrs.vals_size = 0;
 311         ci->i_xattrs.version = 0;
 312         ci->i_xattrs.index_version = 0;
 313
 314         ci->i_caps = RB_ROOT;
 315         ci->i_auth_cap = NULL;
 316         ci->i_dirty_caps = 0;
 317         ci->i_flushing_caps = 0;
 318         INIT_LIST_HEAD(&ci->i_dirty_item);
 319         INIT_LIST_HEAD(&ci->i_flushing_item);
 320         ci->i_cap_flush_seq = 0;
 321         ci->i_cap_flush_last_tid = 0;
 322         memset(&ci->i_cap_flush_tid, 0, sizeof(ci->i_cap_flush_tid));
 323         init_waitqueue_head(&ci->i_cap_wq);
 324         ci->i_hold_caps_min = 0;
 325         ci->i_hold_caps_max = 0;
 326         INIT_LIST_HEAD(&ci->i_cap_delay_list);
 327         ci->i_cap_exporting_mds = 0;
 328         ci->i_cap_exporting_mseq = 0;
 329         ci->i_cap_exporting_issued = 0;
 330         INIT_LIST_HEAD(&ci->i_cap_snaps);
 331         ci->i_head_snapc = NULL;
 332         ci->i_snap_caps = 0;
 333
 334         for (i = 0; i < CEPH_FILE_MODE_NUM; i++)
 335                 ci->i_nr_by_mode[i] = 0;
 336
 337         ci->i_truncate_seq = 0;
 338         ci->i_truncate_size = 0;
 339         ci->i_truncate_pending = 0;
 340
 341         ci->i_max_size = 0;
 342         ci->i_reported_size = 0;
 343         ci->i_wanted_max_size = 0;
 344         ci->i_requested_max_size = 0;
 345
 346         ci->i_pin_ref = 0;
 347         ci->i_rd_ref = 0;
 348         ci->i_rdcache_ref = 0;
 349         ci->i_wr_ref = 0;
 350         ci->i_wrbuffer_ref = 0;
 351         ci->i_wrbuffer_ref_head = 0;
 352         ci->i_shared_gen = 0;
 353         ci->i_rdcache_gen = 0;
 354         ci->i_rdcache_revoking = 0;
 355
 356         INIT_LIST_HEAD(&ci->i_unsafe_writes);
 357         INIT_LIST_HEAD(&ci->i_unsafe_dirops);
 358         spin_lock_init(&ci->i_unsafe_lock);
 359
 360         ci->i_snap_realm = NULL;
 361         INIT_LIST_HEAD(&ci->i_snap_realm_item);
 362         INIT_LIST_HEAD(&ci->i_snap_flush_item);
 363
 364         INIT_WORK(&ci->i_wb_work, ceph_writeback_work);
 365         INIT_WORK(&ci->i_pg_inv_work, ceph_invalidate_work);
 366
 367         INIT_WORK(&ci->i_vmtruncate_work, ceph_vmtruncate_work);
 368
 369         return &ci->vfs_inode;
 370 }
 371
 372 void ceph_destroy_inode(struct inode *inode)
 373 {
 374         struct ceph_inode_info *ci = ceph_inode(inode);
 375         struct ceph_inode_frag *frag;
 376         struct rb_node *n;
 377
 378         dout("destroy_inode %p ino %llx.%llx\n", inode, ceph_vinop(inode));
 379
 380         ceph_queue_caps_release(inode);
 381
 382         /*
 383          * we may still have a snap_realm reference if there are stray
 384          * caps in i_cap_exporting_issued or i_snap_caps.
 385          */
 386         if (ci->i_snap_realm) {
 387                 struct ceph_mds_client *mdsc =
 388                         ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc;
 389                 struct ceph_snap_realm *realm = ci->i_snap_realm;
 390
 391                 dout(" dropping residual ref to snap realm %p\n", realm);
 392                 spin_lock(&realm->inodes_with_caps_lock);
 393                 list_del_init(&ci->i_snap_realm_item);
 394                 spin_unlock(&realm->inodes_with_caps_lock);
 395                 ceph_put_snap_realm(mdsc, realm);
 396         }
 397
 398         kfree(ci->i_symlink);
 399         while ((n = rb_first(&ci->i_fragtree)) != NULL) {
 400                 frag = rb_entry(n, struct ceph_inode_frag, node);
 401                 rb_erase(n, &ci->i_fragtree);
 402                 kfree(frag);
 403         }
 404
 405         __ceph_destroy_xattrs(ci);
 406         if (ci->i_xattrs.blob)
 407                 ceph_buffer_put(ci->i_xattrs.blob);
 408         if (ci->i_xattrs.prealloc_blob)
 409                 ceph_buffer_put(ci->i_xattrs.prealloc_blob);
 410
 411         kmem_cache_free(ceph_inode_cachep, ci);
 412 }
 413
 414
 415 /*
 416  * Helpers to fill in size, ctime, mtime, and atime.  We have to be
 417  * careful because either the client or MDS may have more up to date
 418  * info, depending on which capabilities are held, and whether
 419  * time_warp_seq or truncate_seq have increased.  (Ordinarily, mtime
 420  * and size are monotonically increasing, except when utimes() or
 421  * truncate() increments the corresponding _seq values.)
 422  */
 423 int ceph_fill_file_size(struct inode *inode, int issued,
 424                         u32 truncate_seq, u64 truncate_size, u64 size)
 425 {
 426         struct ceph_inode_info *ci = ceph_inode(inode);
 427         int queue_trunc = 0;
 428
 429         if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) > 0 ||
 430             (truncate_seq == ci->i_truncate_seq && size > inode->i_size)) {
 431                 dout("size %lld -> %llu\n", inode->i_size, size);
 432                 inode->i_size = size;
 433                 inode->i_blocks = (size + (1<<9) - 1) >> 9;
 434                 ci->i_reported_size = size;
 435                 if (truncate_seq != ci->i_truncate_seq) {
 436                         dout("truncate_seq %u -> %u\n",
 437                              ci->i_truncate_seq, truncate_seq);
 438                         ci->i_truncate_seq = truncate_seq;
 439                         /*
 440                          * If we hold relevant caps, or in the case where we're
 441                          * not the only client referencing this file and we
 442                          * don't hold those caps, then we need to check whether
 443                          * the file is either opened or mmaped
 444                          */
 445                         if ((issued & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_RD|
 446                                        CEPH_CAP_FILE_WR|CEPH_CAP_FILE_BUFFER|
 447                                        CEPH_CAP_FILE_EXCL|
 448                                        CEPH_CAP_FILE_LAZYIO)) ||
 449                             mapping_mapped(inode->i_mapping) ||
 450                             __ceph_caps_file_wanted(ci)) {
 451                                 ci->i_truncate_pending++;
 452                                 queue_trunc = 1;
 453                         }
 454                 }
 455         }
 456         if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) >= 0 &&
 457             ci->i_truncate_size != truncate_size) {
 458                 dout("truncate_size %lld -> %llu\n", ci->i_truncate_size,
 459                      truncate_size);
 460                 ci->i_truncate_size = truncate_size;
 461         }
 462         return queue_trunc;
 463 }
 464
 465 void ceph_fill_file_time(struct inode *inode, int issued,
 466                          u64 time_warp_seq, struct timespec *ctime,
 467                          struct timespec *mtime, struct timespec *atime)
 468 {
 469         struct ceph_inode_info *ci = ceph_inode(inode);
 470         int warn = 0;
 471
 472         if (issued & (CEPH_CAP_FILE_EXCL|
 473                       CEPH_CAP_FILE_WR|
 474                       CEPH_CAP_FILE_BUFFER)) {
 475                 if (timespec_compare(ctime, &inode->i_ctime) > 0) {
 476                         dout("ctime %ld.%09ld -> %ld.%09ld inc w/ cap\n",
 477                              inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
 478                              ctime->tv_sec, ctime->tv_nsec);
 479                         inode->i_ctime = *ctime;
 480                 }
 481                 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) > 0) {
 482                         /* the MDS did a utimes() */
 483                         dout("mtime %ld.%09ld -> %ld.%09ld "
 484                              "tw %d -> %d\n",
 485                              inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
 486                              mtime->tv_sec, mtime->tv_nsec,
 487                              ci->i_time_warp_seq, (int)time_warp_seq);
 488
 489                         inode->i_mtime = *mtime;
 490                         inode->i_atime = *atime;
 491                         ci->i_time_warp_seq = time_warp_seq;
 492                 } else if (time_warp_seq == ci->i_time_warp_seq) {
 493                         /* nobody did utimes(); take the max */
 494                         if (timespec_compare(mtime, &inode->i_mtime) > 0) {
 495                                 dout("mtime %ld.%09ld -> %ld.%09ld inc\n",
 496                                      inode->i_mtime.tv_sec,
 497                                      inode->i_mtime.tv_nsec,
 498                                      mtime->tv_sec, mtime->tv_nsec);
 499                                 inode->i_mtime = *mtime;
 500                         }
 501                         if (timespec_compare(atime, &inode->i_atime) > 0) {
 502                                 dout("atime %ld.%09ld -> %ld.%09ld inc\n",
 503                                      inode->i_atime.tv_sec,
 504                                      inode->i_atime.tv_nsec,
 505                                      atime->tv_sec, atime->tv_nsec);
 506                                 inode->i_atime = *atime;
 507                         }
 508                 } else if (issued & CEPH_CAP_FILE_EXCL) {
 509                         /* we did a utimes(); ignore mds values */
 510                 } else {
 511                         warn = 1;
 512                 }
 513         } else {
 514                 /* we have no write caps; whatever the MDS says is true */
 515                 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) >= 0) {
 516                         inode->i_ctime = *ctime;
 517                         inode->i_mtime = *mtime;
 518                         inode->i_atime = *atime;
 519                         ci->i_time_warp_seq = time_warp_seq;
 520                 } else {
 521                         warn = 1;
 522                 }
 523         }
 524         if (warn) /* time_warp_seq shouldn't go backwards */
 525                 dout("%p mds time_warp_seq %llu < %u\n",
 526                      inode, time_warp_seq, ci->i_time_warp_seq);
 527 }
 528
 529 /*
 530  * Populate an inode based on info from mds.  May be called on new or
 531  * existing inodes.
 532  */
 533 static int fill_inode(struct inode *inode,
 534                       struct ceph_mds_reply_info_in *iinfo,
 535                       struct ceph_mds_reply_dirfrag *dirinfo,
 536                       struct ceph_mds_session *session,
 537                       unsigned long ttl_from, int cap_fmode,
 538                       struct ceph_cap_reservation *caps_reservation)
 539 {
 540         struct ceph_mds_reply_inode *info = iinfo->in;
 541         struct ceph_inode_info *ci = ceph_inode(inode);
 542         int i;
 543         int issued, implemented;
 544         struct timespec mtime, atime, ctime;
 545         u32 nsplits;
 546         struct ceph_buffer *xattr_blob = NULL;
 547         int err = 0;
 548         int queue_trunc = 0;
 549
 550         dout("fill_inode %p ino %llx.%llx v %llu had %llu\n",
 551              inode, ceph_vinop(inode), le64_to_cpu(info->version),
 552              ci->i_version);
 553
 554         /*
 555          * prealloc xattr data, if it looks like we'll need it.  only
 556          * if len > 4 (meaning there are actually xattrs; the first 4
 557          * bytes are the xattr count).
 558          */
 559         if (iinfo->xattr_len > 4) {
 560                 xattr_blob = ceph_buffer_new(iinfo->xattr_len, GFP_NOFS);
 561                 if (!xattr_blob)
 562                         pr_err("fill_inode ENOMEM xattr blob %d bytes\n",
 563                                iinfo->xattr_len);
 564         }
 565
 566         spin_lock(&inode->i_lock);
 567
 568         /*
 569          * provided version will be odd if inode value is projected,
 570          * even if stable.  skip the update if we have a newer info
 571          * (e.g., due to inode info racing form multiple MDSs), or if
 572          * we are getting projected (unstable) inode info.
 573          */
 574         if (le64_to_cpu(info->version) > 0 &&
 575             (ci->i_version & ~1) > le64_to_cpu(info->version))
 576                 goto no_change;
 577
 578         issued = __ceph_caps_issued(ci, &implemented);
 579         issued |= implemented | __ceph_caps_dirty(ci);
 580
 581         /* update inode */
 582         ci->i_version = le64_to_cpu(info->version);
 583         inode->i_version++;
 584         inode->i_rdev = le32_to_cpu(info->rdev);
 585
 586         if ((issued & CEPH_CAP_AUTH_EXCL) == 0) {
 587                 inode->i_mode = le32_to_cpu(info->mode);
 588                 inode->i_uid = le32_to_cpu(info->uid);
 589                 inode->i_gid = le32_to_cpu(info->gid);
 590                 dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode,
 591                      inode->i_uid, inode->i_gid);
 592         }
 593
 594         if ((issued & CEPH_CAP_LINK_EXCL) == 0)
 595                 inode->i_nlink = le32_to_cpu(info->nlink);
 596
 597         /* be careful with mtime, atime, size */
 598         ceph_decode_timespec(&atime, &info->atime);
 599         ceph_decode_timespec(&mtime, &info->mtime);
 600         ceph_decode_timespec(&ctime, &info->ctime);
 601         queue_trunc = ceph_fill_file_size(inode, issued,
 602                                           le32_to_cpu(info->truncate_seq),
 603                                           le64_to_cpu(info->truncate_size),
 604                                           le64_to_cpu(info->size));
 605         ceph_fill_file_time(inode, issued,
 606                             le32_to_cpu(info->time_warp_seq),
 607                             &ctime, &mtime, &atime);
 608
 609         ci->i_max_size = le64_to_cpu(info->max_size);
 610         ci->i_layout = info->layout;
 611         inode->i_blkbits = fls(le32_to_cpu(info->layout.fl_stripe_unit)) - 1;
 612
 613         /* xattrs */
 614         /* note that if i_xattrs.len <= 4, i_xattrs.data will still be NULL. */
 615         if ((issued & CEPH_CAP_XATTR_EXCL) == 0 &&
 616             le64_to_cpu(info->xattr_version) > ci->i_xattrs.version) {
 617                 if (ci->i_xattrs.blob)
 618                         ceph_buffer_put(ci->i_xattrs.blob);
 619                 ci->i_xattrs.blob = xattr_blob;
 620                 if (xattr_blob)
 621                         memcpy(ci->i_xattrs.blob->vec.iov_base,
 622                                iinfo->xattr_data, iinfo->xattr_len);
 623                 ci->i_xattrs.version = le64_to_cpu(info->xattr_version);
 624                 xattr_blob = NULL;
 625         }
 626
 627         inode->i_mapping->a_ops = &ceph_aops;
 628         inode->i_mapping->backing_dev_info =
 629                 &ceph_sb_to_client(inode->i_sb)->backing_dev_info;
 630
 631         switch (inode->i_mode & S_IFMT) {
 632         case S_IFIFO:
 633         case S_IFBLK:
 634         case S_IFCHR:
 635         case S_IFSOCK:
 636                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
 637                 inode->i_op = &ceph_file_iops;
 638                 break;
 639         case S_IFREG:
 640                 inode->i_op = &ceph_file_iops;
 641                 inode->i_fop = &ceph_file_fops;
 642                 break;
 643         case S_IFLNK:
 644                 inode->i_op = &ceph_symlink_iops;
 645                 if (!ci->i_symlink) {
 646                         int symlen = iinfo->symlink_len;
 647                         char *sym;
 648
 649                         BUG_ON(symlen != inode->i_size);
 650                         spin_unlock(&inode->i_lock);
 651
 652                         err = -ENOMEM;
 653                         sym = kmalloc(symlen+1, GFP_NOFS);
 654                         if (!sym)
 655                                 goto out;
 656                         memcpy(sym, iinfo->symlink, symlen);
 657                         sym[symlen] = 0;
 658
 659                         spin_lock(&inode->i_lock);
 660                         if (!ci->i_symlink)
 661                                 ci->i_symlink = sym;
 662                         else
 663                                 kfree(sym); /* lost a race */
 664                 }
 665                 break;
 666         case S_IFDIR:
 667                 inode->i_op = &ceph_dir_iops;
 668                 inode->i_fop = &ceph_dir_fops;
 669
 670                 ci->i_files = le64_to_cpu(info->files);
 671                 ci->i_subdirs = le64_to_cpu(info->subdirs);
 672                 ci->i_rbytes = le64_to_cpu(info->rbytes);
 673                 ci->i_rfiles = le64_to_cpu(info->rfiles);
 674                 ci->i_rsubdirs = le64_to_cpu(info->rsubdirs);
 675                 ceph_decode_timespec(&ci->i_rctime, &info->rctime);
 676
 677                 /* set dir completion flag? */
 678                 if (ci->i_files == 0 && ci->i_subdirs == 0 &&
 679                     ceph_snap(inode) == CEPH_NOSNAP &&
 680                     (le32_to_cpu(info->cap.caps) & CEPH_CAP_FILE_SHARED) &&
 681                     (issued & CEPH_CAP_FILE_EXCL) == 0 &&
 682                     (ci->i_ceph_flags & CEPH_I_COMPLETE) == 0) {
 683                         dout(" marking %p complete (empty)\n", inode);
 684                         ci->i_ceph_flags |= CEPH_I_COMPLETE;
 685                         ci->i_max_offset = 2;
 686                 }
 687
 688                 /* it may be better to set st_size in getattr instead? */
 689                 if (ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb), RBYTES))
 690                         inode->i_size = ci->i_rbytes;
 691                 break;
 692         default:
 693                 pr_err("fill_inode %llx.%llx BAD mode 0%o\n",
 694                        ceph_vinop(inode), inode->i_mode);
 695         }
 696
 697 no_change:
 698         spin_unlock(&inode->i_lock);
 699
 700         /* queue truncate if we saw i_size decrease */
 701         if (queue_trunc)
 702                 ceph_queue_vmtruncate(inode);
 703
 704         /* populate frag tree */
 705         /* FIXME: move me up, if/when version reflects fragtree changes */
 706         nsplits = le32_to_cpu(info->fragtree.nsplits);
 707         mutex_lock(&ci->i_fragtree_mutex);
 708         for (i = 0; i < nsplits; i++) {
 709                 u32 id = le32_to_cpu(info->fragtree.splits[i].frag);
 710                 struct ceph_inode_frag *frag = __get_or_create_frag(ci, id);
 711
 712                 if (IS_ERR(frag))
 713                         continue;
 714                 frag->split_by = le32_to_cpu(info->fragtree.splits[i].by);
 715                 dout(" frag %x split by %d\n", frag->frag, frag->split_by);
 716         }
 717         mutex_unlock(&ci->i_fragtree_mutex);
 718
 719         /* were we issued a capability? */
 720         if (info->cap.caps) {
 721                 if (ceph_snap(inode) == CEPH_NOSNAP) {
 722                         ceph_add_cap(inode, session,
 723                                      le64_to_cpu(info->cap.cap_id),
 724                                      cap_fmode,
 725                                      le32_to_cpu(info->cap.caps),
 726                                      le32_to_cpu(info->cap.wanted),
 727                                      le32_to_cpu(info->cap.seq),
 728                                      le32_to_cpu(info->cap.mseq),
 729                                      le64_to_cpu(info->cap.realm),
 730                                      info->cap.flags,
 731                                      caps_reservation);
 732                 } else {
 733                         spin_lock(&inode->i_lock);
 734                         dout(" %p got snap_caps %s\n", inode,
 735                              ceph_cap_string(le32_to_cpu(info->cap.caps)));
 736                         ci->i_snap_caps |= le32_to_cpu(info->cap.caps);
 737                         if (cap_fmode >= 0)
 738                                 __ceph_get_fmode(ci, cap_fmode);
 739                         spin_unlock(&inode->i_lock);
 740                 }
 741         } else if (cap_fmode >= 0) {
 742                 pr_warning("mds issued no caps on %llx.%llx\n",
 743                            ceph_vinop(inode));
 744                 __ceph_get_fmode(ci, cap_fmode);
 745         }
 746
 747         /* update delegation info? */
 748         if (dirinfo)
 749                 ceph_fill_dirfrag(inode, dirinfo);
 750
 751         err = 0;
 752
 753 out:
 754         if (xattr_blob)
 755                 ceph_buffer_put(xattr_blob);
 756         return err;
 757 }
 758
 759 /*
 760  * caller should hold session s_mutex.
 761  */
 762 static void update_dentry_lease(struct dentry *dentry,
 763                                 struct ceph_mds_reply_lease *lease,
 764                                 struct ceph_mds_session *session,
 765                                 unsigned long from_time)
 766 {
 767         struct ceph_dentry_info *di = ceph_dentry(dentry);
 768         long unsigned duration = le32_to_cpu(lease->duration_ms);
 769         long unsigned ttl = from_time + (duration * HZ) / 1000;
 770         long unsigned half_ttl = from_time + (duration * HZ / 2) / 1000;
 771         struct inode *dir;
 772
 773         /* only track leases on regular dentries */
 774         if (dentry->d_op != &ceph_dentry_ops)
 775                 return;
 776
 777         spin_lock(&dentry->d_lock);
 778         dout("update_dentry_lease %p mask %d duration %lu ms ttl %lu\n",
 779              dentry, le16_to_cpu(lease->mask), duration, ttl);
 780
 781         /* make lease_rdcache_gen match directory */
 782         dir = dentry->d_parent->d_inode;
 783         di->lease_shared_gen = ceph_inode(dir)->i_shared_gen;
 784
 785         if (lease->mask == 0)
 786                 goto out_unlock;
 787
 788         if (di->lease_gen == session->s_cap_gen &&
 789             time_before(ttl, dentry->d_time))
 790                 goto out_unlock;  /* we already have a newer lease. */
 791
 792         if (di->lease_session && di->lease_session != session)
 793                 goto out_unlock;
 794
 795         ceph_dentry_lru_touch(dentry);
 796
 797         if (!di->lease_session)
 798                 di->lease_session = ceph_get_mds_session(session);
 799         di->lease_gen = session->s_cap_gen;
 800         di->lease_seq = le32_to_cpu(lease->seq);
 801         di->lease_renew_after = half_ttl;
 802         di->lease_renew_from = 0;
 803         dentry->d_time = ttl;
 804 out_unlock:
 805         spin_unlock(&dentry->d_lock);
 806         return;
 807 }
 808
 809 /*
 810  * Set dentry's directory position based on the current dir's max, and
 811  * order it in d_subdirs, so that dcache_readdir behaves.
 812  */
 813 static void ceph_set_dentry_offset(struct dentry *dn)
 814 {
 815         struct dentry *dir = dn->d_parent;
 816         struct inode *inode = dn->d_parent->d_inode;
 817         struct ceph_dentry_info *di;
 818
 819         BUG_ON(!inode);
 820
 821         di = ceph_dentry(dn);
 822
 823         spin_lock(&inode->i_lock);
 824         if ((ceph_inode(inode)->i_ceph_flags & CEPH_I_COMPLETE) == 0) {
 825                 spin_unlock(&inode->i_lock);
 826                 return;
 827         }
 828         di->offset = ceph_inode(inode)->i_max_offset++;
 829         spin_unlock(&inode->i_lock);
 830
 831         spin_lock(&dcache_lock);
 832         spin_lock(&dn->d_lock);
 833         list_move(&dn->d_u.d_child, &dir->d_subdirs);
 834         dout("set_dentry_offset %p %lld (%p %p)\n", dn, di->offset,
 835              dn->d_u.d_child.prev, dn->d_u.d_child.next);
 836         spin_unlock(&dn->d_lock);
 837         spin_unlock(&dcache_lock);
 838 }
 839
 840 /*
 841  * splice a dentry to an inode.
 842  * caller must hold directory i_mutex for this to be safe.
 843  *
 844  * we will only rehash the resulting dentry if @prehash is
 845  * true; @prehash will be set to false (for the benefit of
 846  * the caller) if we fail.
 847  */
 848 static struct dentry *splice_dentry(struct dentry *dn, struct inode *in,
 849                                     bool *prehash, bool set_offset)
 850 {
 851         struct dentry *realdn;
 852
 853         BUG_ON(dn->d_inode);
 854
 855         /* dn must be unhashed */
 856         if (!d_unhashed(dn))
 857                 d_drop(dn);
 858         realdn = d_materialise_unique(dn, in);
 859         if (IS_ERR(realdn)) {
 860                 pr_err("splice_dentry error %ld %p inode %p ino %llx.%llx\n",
 861                        PTR_ERR(realdn), dn, in, ceph_vinop(in));
 862                 if (prehash)
 863                         *prehash = false; /* don't rehash on error */
 864                 dn = realdn; /* note realdn contains the error */
 865                 goto out;
 866         } else if (realdn) {
 867                 dout("dn %p (%d) spliced with %p (%d) "
 868                      "inode %p ino %llx.%llx\n",
 869                      dn, atomic_read(&dn->d_count),
 870                      realdn, atomic_read(&realdn->d_count),
 871                      realdn->d_inode, ceph_vinop(realdn->d_inode));
 872                 dput(dn);
 873                 dn = realdn;
 874         } else {
 875                 BUG_ON(!ceph_dentry(dn));
 876                 dout("dn %p attached to %p ino %llx.%llx\n",
 877                      dn, dn->d_inode, ceph_vinop(dn->d_inode));
 878         }
 879         if ((!prehash || *prehash) && d_unhashed(dn))
 880                 d_rehash(dn);
 881         if (set_offset)
 882                 ceph_set_dentry_offset(dn);
 883 out:
 884         return dn;
 885 }
 886
 887 /*
 888  * Incorporate results into the local cache.  This is either just
 889  * one inode, or a directory, dentry, and possibly linked-to inode (e.g.,
 890  * after a lookup).
 891  *
 892  * A reply may contain
 893  *         a directory inode along with a dentry.
 894  *  and/or a target inode
 895  *
 896  * Called with snap_rwsem (read).
 897  */
 898 int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req,
 899                     struct ceph_mds_session *session)
 900 {
 901         struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
 902         struct inode *in = NULL;
 903         struct ceph_mds_reply_inode *ininfo;
 904         struct ceph_vino vino;
 905         struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
 906         int i = 0;
 907         int err = 0;
 908
 909         dout("fill_trace %p is_dentry %d is_target %d\n", req,
 910              rinfo->head->is_dentry, rinfo->head->is_target);
 911
 912 #if 0
 913         /*
 914          * Debugging hook:
 915          *
 916          * If we resend completed ops to a recovering mds, we get no
 917          * trace.  Since that is very rare, pretend this is the case
 918          * to ensure the 'no trace' handlers in the callers behave.
 919          *
 920          * Fill in inodes unconditionally to avoid breaking cap
 921          * invariants.
 922          */
 923         if (rinfo->head->op & CEPH_MDS_OP_WRITE) {
 924                 pr_info("fill_trace faking empty trace on %lld %s\n",
 925                         req->r_tid, ceph_mds_op_name(rinfo->head->op));
 926                 if (rinfo->head->is_dentry) {
 927                         rinfo->head->is_dentry = 0;
 928                         err = fill_inode(req->r_locked_dir,
 929                                          &rinfo->diri, rinfo->dirfrag,
 930                                          session, req->r_request_started, -1);
 931                 }
 932                 if (rinfo->head->is_target) {
 933                         rinfo->head->is_target = 0;
 934                         ininfo = rinfo->targeti.in;
 935                         vino.ino = le64_to_cpu(ininfo->ino);
 936                         vino.snap = le64_to_cpu(ininfo->snapid);
 937                         in = ceph_get_inode(sb, vino);
 938                         err = fill_inode(in, &rinfo->targeti, NULL,
 939                                          session, req->r_request_started,
 940                                          req->r_fmode);
 941                         iput(in);
 942                 }
 943         }
 944 #endif
 945
 946         if (!rinfo->head->is_target && !rinfo->head->is_dentry) {
 947                 dout("fill_trace reply is empty!\n");
 948                 if (rinfo->head->result == 0 && req->r_locked_dir)
 949                         ceph_invalidate_dir_request(req);
 950                 return 0;
 951         }
 952
 953         if (rinfo->head->is_dentry) {
 954                 struct inode *dir = req->r_locked_dir;
 955
 956                 err = fill_inode(dir, &rinfo->diri, rinfo->dirfrag,
 957                                  session, req->r_request_started, -1,
 958                                  &req->r_caps_reservation);
 959                 if (err < 0)
 960                         return err;
 961         }
 962
 963         /*
 964          * ignore null lease/binding on snapdir ENOENT, or else we
 965          * will have trouble splicing in the virtual snapdir later
 966          */
 967         if (rinfo->head->is_dentry && !req->r_aborted &&
 968             (rinfo->head->is_target || strncmp(req->r_dentry->d_name.name,
 969                                                fsc->mount_options->snapdir_name,
 970                                                req->r_dentry->d_name.len))) {
 971                 /*
 972                  * lookup link rename   : null -> possibly existing inode
 973                  * mknod symlink mkdir  : null -> new inode
 974                  * unlink               : linked -> null
 975                  */
 976                 struct inode *dir = req->r_locked_dir;
 977                 struct dentry *dn = req->r_dentry;
 978                 bool have_dir_cap, have_lease;
 979
 980                 BUG_ON(!dn);
 981                 BUG_ON(!dir);
 982                 BUG_ON(dn->d_parent->d_inode != dir);
 983                 BUG_ON(ceph_ino(dir) !=
 984                        le64_to_cpu(rinfo->diri.in->ino));
 985                 BUG_ON(ceph_snap(dir) !=
 986                        le64_to_cpu(rinfo->diri.in->snapid));
 987
 988                 /* do we have a lease on the whole dir? */
 989                 have_dir_cap =
 990                         (le32_to_cpu(rinfo->diri.in->cap.caps) &
 991                          CEPH_CAP_FILE_SHARED);
 992
 993                 /* do we have a dn lease? */
 994                 have_lease = have_dir_cap ||
 995                         (le16_to_cpu(rinfo->dlease->mask) &
 996                          CEPH_LOCK_DN);
 997
 998                 if (!have_lease)
 999                         dout("fill_trace  no dentry lease or dir cap\n");
1000
1001                 /* rename? */
1002                 if (req->r_old_dentry && req->r_op == CEPH_MDS_OP_RENAME) {
1003                         dout(" src %p '%.*s' dst %p '%.*s'\n",
1004                              req->r_old_dentry,
1005                              req->r_old_dentry->d_name.len,
1006                              req->r_old_dentry->d_name.name,
1007                              dn, dn->d_name.len, dn->d_name.name);
1008                         dout("fill_trace doing d_move %p -> %p\n",
1009                              req->r_old_dentry, dn);
1010
1011                         /* d_move screws up d_subdirs order */
1012                         ceph_i_clear(dir, CEPH_I_COMPLETE);
1013
1014                         d_move(req->r_old_dentry, dn);
1015                         dout(" src %p '%.*s' dst %p '%.*s'\n",
1016                              req->r_old_dentry,
1017                              req->r_old_dentry->d_name.len,
1018                              req->r_old_dentry->d_name.name,
1019                              dn, dn->d_name.len, dn->d_name.name);
1020
1021                         /* ensure target dentry is invalidated, despite
1022                            rehashing bug in vfs_rename_dir */
1023                         ceph_invalidate_dentry_lease(dn);
1024
1025                         /* take overwritten dentry's readdir offset */
1026                         dout("dn %p gets %p offset %lld (old offset %lld)\n",
1027                              req->r_old_dentry, dn, ceph_dentry(dn)->offset,
1028                              ceph_dentry(req->r_old_dentry)->offset);
1029                         ceph_dentry(req->r_old_dentry)->offset =
1030                                 ceph_dentry(dn)->offset;
1031
1032                         dn = req->r_old_dentry;  /* use old_dentry */
1033                         in = dn->d_inode;
1034                 }
1035
1036                 /* null dentry? */
1037                 if (!rinfo->head->is_target) {
1038                         dout("fill_trace null dentry\n");
1039                         if (dn->d_inode) {
1040                                 dout("d_delete %p\n", dn);
1041                                 d_delete(dn);
1042                         } else {
1043                                 dout("d_instantiate %p NULL\n", dn);
1044                                 d_instantiate(dn, NULL);
1045                                 if (have_lease && d_unhashed(dn))
1046                                         d_rehash(dn);
1047                                 update_dentry_lease(dn, rinfo->dlease,
1048                                                     session,
1049                                                     req->r_request_started);
1050                         }
1051                         goto done;
1052                 }
1053
1054                 /* attach proper inode */
1055                 ininfo = rinfo->targeti.in;
1056                 vino.ino = le64_to_cpu(ininfo->ino);
1057                 vino.snap = le64_to_cpu(ininfo->snapid);
1058                 if (!dn->d_inode) {
1059                         in = ceph_get_inode(sb, vino);
1060                         if (IS_ERR(in)) {
1061                                 pr_err("fill_trace bad get_inode "
1062                                        "%llx.%llx\n", vino.ino, vino.snap);
1063                                 err = PTR_ERR(in);
1064                                 d_delete(dn);
1065                                 goto done;
1066                         }
1067                         dn = splice_dentry(dn, in, &have_lease, true);
1068                         if (IS_ERR(dn)) {
1069                                 err = PTR_ERR(dn);
1070                                 goto done;
1071                         }
1072                         req->r_dentry = dn;  /* may have spliced */
1073                         igrab(in);
1074                 } else if (ceph_ino(in) == vino.ino &&
1075                            ceph_snap(in) == vino.snap) {
1076                         igrab(in);
1077                 } else {
1078                         dout(" %p links to %p %llx.%llx, not %llx.%llx\n",
1079                              dn, in, ceph_ino(in), ceph_snap(in),
1080                              vino.ino, vino.snap);
1081                         have_lease = false;
1082                         in = NULL;
1083                 }
1084
1085                 if (have_lease)
1086                         update_dentry_lease(dn, rinfo->dlease, session,
1087                                             req->r_request_started);
1088                 dout(" final dn %p\n", dn);
1089                 i++;
1090         } else if (req->r_op == CEPH_MDS_OP_LOOKUPSNAP ||
1091                    req->r_op == CEPH_MDS_OP_MKSNAP) {
1092                 struct dentry *dn = req->r_dentry;
1093
1094                 /* fill out a snapdir LOOKUPSNAP dentry */
1095                 BUG_ON(!dn);
1096                 BUG_ON(!req->r_locked_dir);
1097                 BUG_ON(ceph_snap(req->r_locked_dir) != CEPH_SNAPDIR);
1098                 ininfo = rinfo->targeti.in;
1099                 vino.ino = le64_to_cpu(ininfo->ino);
1100                 vino.snap = le64_to_cpu(ininfo->snapid);
1101                 in = ceph_get_inode(sb, vino);
1102                 if (IS_ERR(in)) {
1103                         pr_err("fill_inode get_inode badness %llx.%llx\n",
1104                                vino.ino, vino.snap);
1105                         err = PTR_ERR(in);
1106                         d_delete(dn);
1107                         goto done;
1108                 }
1109                 dout(" linking snapped dir %p to dn %p\n", in, dn);
1110                 dn = splice_dentry(dn, in, NULL, true);
1111                 if (IS_ERR(dn)) {
1112                         err = PTR_ERR(dn);
1113                         goto done;
1114                 }
1115                 req->r_dentry = dn;  /* may have spliced */
1116                 igrab(in);
1117                 rinfo->head->is_dentry = 1;  /* fool notrace handlers */
1118         }
1119
1120         if (rinfo->head->is_target) {
1121                 vino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1122                 vino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1123
1124                 if (in == NULL || ceph_ino(in) != vino.ino ||
1125                     ceph_snap(in) != vino.snap) {
1126                         in = ceph_get_inode(sb, vino);
1127                         if (IS_ERR(in)) {
1128                                 err = PTR_ERR(in);
1129                                 goto done;
1130                         }
1131                 }
1132                 req->r_target_inode = in;
1133
1134                 err = fill_inode(in,
1135                                  &rinfo->targeti, NULL,
1136                                  session, req->r_request_started,
1137                                  (le32_to_cpu(rinfo->head->result) == 0) ?
1138                                  req->r_fmode : -1,
1139                                  &req->r_caps_reservation);
1140                 if (err < 0) {
1141                         pr_err("fill_inode badness %p %llx.%llx\n",
1142                                in, ceph_vinop(in));
1143                         goto done;
1144                 }
1145         }
1146
1147 done:
1148         dout("fill_trace done err=%d\n", err);
1149         return err;
1150 }
1151
1152 /*
1153  * Prepopulate our cache with readdir results, leases, etc.
1154  */
1155 int ceph_readdir_prepopulate(struct ceph_mds_request *req,
1156                              struct ceph_mds_session *session)
1157 {
1158         struct dentry *parent = req->r_dentry;
1159         struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1160         struct qstr dname;
1161         struct dentry *dn;
1162         struct inode *in;
1163         int err = 0, i;
1164         struct inode *snapdir = NULL;
1165         struct ceph_mds_request_head *rhead = req->r_request->front.iov_base;
1166         u64 frag = le32_to_cpu(rhead->args.readdir.frag);
1167         struct ceph_dentry_info *di;
1168
1169         if (le32_to_cpu(rinfo->head->op) == CEPH_MDS_OP_LSSNAP) {
1170                 snapdir = ceph_get_snapdir(parent->d_inode);
1171                 parent = d_find_alias(snapdir);
1172                 dout("readdir_prepopulate %d items under SNAPDIR dn %p\n",
1173                      rinfo->dir_nr, parent);
1174         } else {
1175                 dout("readdir_prepopulate %d items under dn %p\n",
1176                      rinfo->dir_nr, parent);
1177                 if (rinfo->dir_dir)
1178                         ceph_fill_dirfrag(parent->d_inode, rinfo->dir_dir);
1179         }
1180
1181         for (i = 0; i < rinfo->dir_nr; i++) {
1182                 struct ceph_vino vino;
1183
1184                 dname.name = rinfo->dir_dname[i];
1185                 dname.len = rinfo->dir_dname_len[i];
1186                 dname.hash = full_name_hash(dname.name, dname.len);
1187
1188                 vino.ino = le64_to_cpu(rinfo->dir_in[i].in->ino);
1189                 vino.snap = le64_to_cpu(rinfo->dir_in[i].in->snapid);
1190
1191 retry_lookup:
1192                 dn = d_lookup(parent, &dname);
1193                 dout("d_lookup on parent=%p name=%.*s got %p\n",
1194                      parent, dname.len, dname.name, dn);
1195
1196                 if (!dn) {
1197                         dn = d_alloc(parent, &dname);
1198                         dout("d_alloc %p '%.*s' = %p\n", parent,
1199                              dname.len, dname.name, dn);
1200                         if (dn == NULL) {
1201                                 dout("d_alloc badness\n");
1202                                 err = -ENOMEM;
1203                                 goto out;
1204                         }
1205                         err = ceph_init_dentry(dn);
1206                         if (err < 0) {
1207                                 dput(dn);
1208                                 goto out;
1209                         }
1210                 } else if (dn->d_inode &&
1211                            (ceph_ino(dn->d_inode) != vino.ino ||
1212                             ceph_snap(dn->d_inode) != vino.snap)) {
1213                         dout(" dn %p points to wrong inode %p\n",
1214                              dn, dn->d_inode);
1215                         d_delete(dn);
1216                         dput(dn);
1217                         goto retry_lookup;
1218                 } else {
1219                         /* reorder parent's d_subdirs */
1220                         spin_lock(&dcache_lock);
1221                         spin_lock(&dn->d_lock);
1222                         list_move(&dn->d_u.d_child, &parent->d_subdirs);
1223                         spin_unlock(&dn->d_lock);
1224                         spin_unlock(&dcache_lock);
1225                 }
1226
1227                 di = dn->d_fsdata;
1228                 di->offset = ceph_make_fpos(frag, i + req->r_readdir_offset);
1229
1230                 /* inode */
1231                 if (dn->d_inode) {
1232                         in = dn->d_inode;
1233                 } else {
1234                         in = ceph_get_inode(parent->d_sb, vino);
1235                         if (IS_ERR(in)) {
1236                                 dout("new_inode badness\n");
1237                                 d_delete(dn);
1238                                 dput(dn);
1239                                 err = PTR_ERR(in);
1240                                 goto out;
1241                         }
1242                         dn = splice_dentry(dn, in, NULL, false);
1243                         if (IS_ERR(dn))
1244                                 dn = NULL;
1245                 }
1246
1247                 if (fill_inode(in, &rinfo->dir_in[i], NULL, session,
1248                                req->r_request_started, -1,
1249                                &req->r_caps_reservation) < 0) {
1250                         pr_err("fill_inode badness on %p\n", in);
1251                         goto next_item;
1252                 }
1253                 if (dn)
1254                         update_dentry_lease(dn, rinfo->dir_dlease[i],
1255                                             req->r_session,
1256                                             req->r_request_started);
1257 next_item:
1258                 if (dn)
1259                         dput(dn);
1260         }
1261         req->r_did_prepopulate = true;
1262
1263 out:
1264         if (snapdir) {
1265                 iput(snapdir);
1266                 dput(parent);
1267         }
1268         dout("readdir_prepopulate done\n");
1269         return err;
1270 }
1271
1272 int ceph_inode_set_size(struct inode *inode, loff_t size)
1273 {
1274         struct ceph_inode_info *ci = ceph_inode(inode);
1275         int ret = 0;
1276
1277         spin_lock(&inode->i_lock);
1278         dout("set_size %p %llu -> %llu\n", inode, inode->i_size, size);
1279         inode->i_size = size;
1280         inode->i_blocks = (size + (1 << 9) - 1) >> 9;
1281
1282         /* tell the MDS if we are approaching max_size */
1283         if ((size << 1) >= ci->i_max_size &&
1284             (ci->i_reported_size << 1) < ci->i_max_size)
1285                 ret = 1;
1286
1287         spin_unlock(&inode->i_lock);
1288         return ret;
1289 }
1290
1291 /*
1292  * Write back inode data in a worker thread.  (This can't be done
1293  * in the message handler context.)
1294  */
1295 void ceph_queue_writeback(struct inode *inode)
1296 {
1297         if (queue_work(ceph_inode_to_client(inode)->wb_wq,
1298                        &ceph_inode(inode)->i_wb_work)) {
1299                 dout("ceph_queue_writeback %p\n", inode);
1300                 igrab(inode);
1301         } else {
1302                 dout("ceph_queue_writeback %p failed\n", inode);
1303         }
1304 }
1305
1306 static void ceph_writeback_work(struct work_struct *work)
1307 {
1308         struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1309                                                   i_wb_work);
1310         struct inode *inode = &ci->vfs_inode;
1311
1312         dout("writeback %p\n", inode);
1313         filemap_fdatawrite(&inode->i_data);
1314         iput(inode);
1315 }
1316
1317 /*
1318  * queue an async invalidation
1319  */
1320 void ceph_queue_invalidate(struct inode *inode)
1321 {
1322         if (queue_work(ceph_inode_to_client(inode)->pg_inv_wq,
1323                        &ceph_inode(inode)->i_pg_inv_work)) {
1324                 dout("ceph_queue_invalidate %p\n", inode);
1325                 igrab(inode);
1326         } else {
1327                 dout("ceph_queue_invalidate %p failed\n", inode);
1328         }
1329 }
1330
1331 /*
1332  * invalidate any pages that are not dirty or under writeback.  this
1333  * includes pages that are clean and mapped.
1334  */
1335 static void ceph_invalidate_nondirty_pages(struct address_space *mapping)
1336 {
1337         struct pagevec pvec;
1338         pgoff_t next = 0;
1339         int i;
1340
1341         pagevec_init(&pvec, 0);
1342         while (pagevec_lookup(&pvec, mapping, next, PAGEVEC_SIZE)) {
1343                 for (i = 0; i < pagevec_count(&pvec); i++) {
1344                         struct page *page = pvec.pages[i];
1345                         pgoff_t index;
1346                         int skip_page =
1347                                 (PageDirty(page) || PageWriteback(page));
1348
1349                         if (!skip_page)
1350                                 skip_page = !trylock_page(page);
1351
1352                         /*
1353                          * We really shouldn't be looking at the ->index of an
1354                          * unlocked page.  But we're not allowed to lock these
1355                          * pages.  So we rely upon nobody altering the ->index
1356                          * of this (pinned-by-us) page.
1357                          */
1358                         index = page->index;
1359                         if (index > next)
1360                                 next = index;
1361                         next++;
1362
1363                         if (skip_page)
1364                                 continue;
1365
1366                         generic_error_remove_page(mapping, page);
1367                         unlock_page(page);
1368                 }
1369                 pagevec_release(&pvec);
1370                 cond_resched();
1371         }
1372 }
1373
1374 /*
1375  * Invalidate inode pages in a worker thread.  (This can't be done
1376  * in the message handler context.)
1377  */
1378 static void ceph_invalidate_work(struct work_struct *work)
1379 {
1380         struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1381                                                   i_pg_inv_work);
1382         struct inode *inode = &ci->vfs_inode;
1383         u32 orig_gen;
1384         int check = 0;
1385
1386         spin_lock(&inode->i_lock);
1387         dout("invalidate_pages %p gen %d revoking %d\n", inode,
1388              ci->i_rdcache_gen, ci->i_rdcache_revoking);
1389         if (ci->i_rdcache_gen == 0 ||
1390             ci->i_rdcache_revoking != ci->i_rdcache_gen) {
1391                 BUG_ON(ci->i_rdcache_revoking > ci->i_rdcache_gen);
1392                 /* nevermind! */
1393                 ci->i_rdcache_revoking = 0;
1394                 spin_unlock(&inode->i_lock);
1395                 goto out;
1396         }
1397         orig_gen = ci->i_rdcache_gen;
1398         spin_unlock(&inode->i_lock);
1399
1400         ceph_invalidate_nondirty_pages(inode->i_mapping);
1401
1402         spin_lock(&inode->i_lock);
1403         if (orig_gen == ci->i_rdcache_gen) {
1404                 dout("invalidate_pages %p gen %d successful\n", inode,
1405                      ci->i_rdcache_gen);
1406                 ci->i_rdcache_gen = 0;
1407                 ci->i_rdcache_revoking = 0;
1408                 check = 1;
1409         } else {
1410                 dout("invalidate_pages %p gen %d raced, gen now %d\n",
1411                      inode, orig_gen, ci->i_rdcache_gen);
1412         }
1413         spin_unlock(&inode->i_lock);
1414
1415         if (check)
1416                 ceph_check_caps(ci, 0, NULL);
1417 out:
1418         iput(inode);
1419 }
1420
1421
1422 /*
1423  * called by trunc_wq; take i_mutex ourselves
1424  *
1425  * We also truncate in a separate thread as well.
1426  */
1427 static void ceph_vmtruncate_work(struct work_struct *work)
1428 {
1429         struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1430                                                   i_vmtruncate_work);
1431         struct inode *inode = &ci->vfs_inode;
1432
1433         dout("vmtruncate_work %p\n", inode);
1434         mutex_lock(&inode->i_mutex);
1435         __ceph_do_pending_vmtruncate(inode);
1436         mutex_unlock(&inode->i_mutex);
1437         iput(inode);
1438 }
1439
1440 /*
1441  * Queue an async vmtruncate.  If we fail to queue work, we will handle
1442  * the truncation the next time we call __ceph_do_pending_vmtruncate.
1443  */
1444 void ceph_queue_vmtruncate(struct inode *inode)
1445 {
1446         struct ceph_inode_info *ci = ceph_inode(inode);
1447
1448         if (queue_work(ceph_sb_to_client(inode->i_sb)->trunc_wq,
1449                        &ci->i_vmtruncate_work)) {
1450                 dout("ceph_queue_vmtruncate %p\n", inode);
1451                 igrab(inode);
1452         } else {
1453                 dout("ceph_queue_vmtruncate %p failed, pending=%d\n",
1454                      inode, ci->i_truncate_pending);
1455         }
1456 }
1457
1458 /*
1459  * called with i_mutex held.
1460  *
1461  * Make sure any pending truncation is applied before doing anything
1462  * that may depend on it.
1463  */
1464 void __ceph_do_pending_vmtruncate(struct inode *inode)
1465 {
1466         struct ceph_inode_info *ci = ceph_inode(inode);
1467         u64 to;
1468         int wrbuffer_refs, wake = 0;
1469
1470 retry:
1471         spin_lock(&inode->i_lock);
1472         if (ci->i_truncate_pending == 0) {
1473                 dout("__do_pending_vmtruncate %p none pending\n", inode);
1474                 spin_unlock(&inode->i_lock);
1475                 return;
1476         }
1477
1478         /*
1479          * make sure any dirty snapped pages are flushed before we
1480          * possibly truncate them.. so write AND block!
1481          */
1482         if (ci->i_wrbuffer_ref_head < ci->i_wrbuffer_ref) {
1483                 dout("__do_pending_vmtruncate %p flushing snaps first\n",
1484                      inode);
1485                 spin_unlock(&inode->i_lock);
1486                 filemap_write_and_wait_range(&inode->i_data, 0,
1487                                              inode->i_sb->s_maxbytes);
1488                 goto retry;
1489         }
1490
1491         to = ci->i_truncate_size;
1492         wrbuffer_refs = ci->i_wrbuffer_ref;
1493         dout("__do_pending_vmtruncate %p (%d) to %lld\n", inode,
1494              ci->i_truncate_pending, to);
1495         spin_unlock(&inode->i_lock);
1496
1497         truncate_inode_pages(inode->i_mapping, to);
1498
1499         spin_lock(&inode->i_lock);
1500         ci->i_truncate_pending--;
1501         if (ci->i_truncate_pending == 0)
1502                 wake = 1;
1503         spin_unlock(&inode->i_lock);
1504
1505         if (wrbuffer_refs == 0)
1506                 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
1507         if (wake)
1508                 wake_up_all(&ci->i_cap_wq);
1509 }
1510
1511
1512 /*
1513  * symlinks
1514  */
1515 static void *ceph_sym_follow_link(struct dentry *dentry, struct nameidata *nd)
1516 {
1517         struct ceph_inode_info *ci = ceph_inode(dentry->d_inode);
1518         nd_set_link(nd, ci->i_symlink);
1519         return NULL;
1520 }
1521
1522 static const struct inode_operations ceph_symlink_iops = {
1523         .readlink = generic_readlink,
1524         .follow_link = ceph_sym_follow_link,
1525 };
1526
1527 /*
1528  * setattr
1529  */
1530 int ceph_setattr(struct dentry *dentry, struct iattr *attr)
1531 {
1532         struct inode *inode = dentry->d_inode;
1533         struct ceph_inode_info *ci = ceph_inode(inode);
1534         struct inode *parent_inode = dentry->d_parent->d_inode;
1535         const unsigned int ia_valid = attr->ia_valid;
1536         struct ceph_mds_request *req;
1537         struct ceph_mds_client *mdsc = ceph_sb_to_client(dentry->d_sb)->mdsc;
1538         int issued;
1539         int release = 0, dirtied = 0;
1540         int mask = 0;
1541         int err = 0;
1542
1543         if (ceph_snap(inode) != CEPH_NOSNAP)
1544                 return -EROFS;
1545
1546         __ceph_do_pending_vmtruncate(inode);
1547
1548         err = inode_change_ok(inode, attr);
1549         if (err != 0)
1550                 return err;
1551
1552         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETATTR,
1553                                        USE_AUTH_MDS);
1554         if (IS_ERR(req))
1555                 return PTR_ERR(req);
1556
1557         spin_lock(&inode->i_lock);
1558         issued = __ceph_caps_issued(ci, NULL);
1559         dout("setattr %p issued %s\n", inode, ceph_cap_string(issued));
1560
1561         if (ia_valid & ATTR_UID) {
1562                 dout("setattr %p uid %d -> %d\n", inode,
1563                      inode->i_uid, attr->ia_uid);
1564                 if (issued & CEPH_CAP_AUTH_EXCL) {
1565                         inode->i_uid = attr->ia_uid;
1566                         dirtied |= CEPH_CAP_AUTH_EXCL;
1567                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1568                            attr->ia_uid != inode->i_uid) {
1569                         req->r_args.setattr.uid = cpu_to_le32(attr->ia_uid);
1570                         mask |= CEPH_SETATTR_UID;
1571                         release |= CEPH_CAP_AUTH_SHARED;
1572                 }
1573         }
1574         if (ia_valid & ATTR_GID) {
1575                 dout("setattr %p gid %d -> %d\n", inode,
1576                      inode->i_gid, attr->ia_gid);
1577                 if (issued & CEPH_CAP_AUTH_EXCL) {
1578                         inode->i_gid = attr->ia_gid;
1579                         dirtied |= CEPH_CAP_AUTH_EXCL;
1580                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1581                            attr->ia_gid != inode->i_gid) {
1582                         req->r_args.setattr.gid = cpu_to_le32(attr->ia_gid);
1583                         mask |= CEPH_SETATTR_GID;
1584                         release |= CEPH_CAP_AUTH_SHARED;
1585                 }
1586         }
1587         if (ia_valid & ATTR_MODE) {
1588                 dout("setattr %p mode 0%o -> 0%o\n", inode, inode->i_mode,
1589                      attr->ia_mode);
1590                 if (issued & CEPH_CAP_AUTH_EXCL) {
1591                         inode->i_mode = attr->ia_mode;
1592                         dirtied |= CEPH_CAP_AUTH_EXCL;
1593                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1594                            attr->ia_mode != inode->i_mode) {
1595                         req->r_args.setattr.mode = cpu_to_le32(attr->ia_mode);
1596                         mask |= CEPH_SETATTR_MODE;
1597                         release |= CEPH_CAP_AUTH_SHARED;
1598                 }
1599         }
1600
1601         if (ia_valid & ATTR_ATIME) {
1602                 dout("setattr %p atime %ld.%ld -> %ld.%ld\n", inode,
1603                      inode->i_atime.tv_sec, inode->i_atime.tv_nsec,
1604                      attr->ia_atime.tv_sec, attr->ia_atime.tv_nsec);
1605                 if (issued & CEPH_CAP_FILE_EXCL) {
1606                         ci->i_time_warp_seq++;
1607                         inode->i_atime = attr->ia_atime;
1608                         dirtied |= CEPH_CAP_FILE_EXCL;
1609                 } else if ((issued & CEPH_CAP_FILE_WR) &&
1610                            timespec_compare(&inode->i_atime,
1611                                             &attr->ia_atime) < 0) {
1612                         inode->i_atime = attr->ia_atime;
1613                         dirtied |= CEPH_CAP_FILE_WR;
1614                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1615                            !timespec_equal(&inode->i_atime, &attr->ia_atime)) {
1616                         ceph_encode_timespec(&req->r_args.setattr.atime,
1617                                              &attr->ia_atime);
1618                         mask |= CEPH_SETATTR_ATIME;
1619                         release |= CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_RD |
1620                                 CEPH_CAP_FILE_WR;
1621                 }
1622         }
1623         if (ia_valid & ATTR_MTIME) {
1624                 dout("setattr %p mtime %ld.%ld -> %ld.%ld\n", inode,
1625                      inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
1626                      attr->ia_mtime.tv_sec, attr->ia_mtime.tv_nsec);
1627                 if (issued & CEPH_CAP_FILE_EXCL) {
1628                         ci->i_time_warp_seq++;
1629                         inode->i_mtime = attr->ia_mtime;
1630                         dirtied |= CEPH_CAP_FILE_EXCL;
1631                 } else if ((issued & CEPH_CAP_FILE_WR) &&
1632                            timespec_compare(&inode->i_mtime,
1633                                             &attr->ia_mtime) < 0) {
1634                         inode->i_mtime = attr->ia_mtime;
1635                         dirtied |= CEPH_CAP_FILE_WR;
1636                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1637                            !timespec_equal(&inode->i_mtime, &attr->ia_mtime)) {
1638                         ceph_encode_timespec(&req->r_args.setattr.mtime,
1639                                              &attr->ia_mtime);
1640                         mask |= CEPH_SETATTR_MTIME;
1641                         release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD |
1642                                 CEPH_CAP_FILE_WR;
1643                 }
1644         }
1645         if (ia_valid & ATTR_SIZE) {
1646                 dout("setattr %p size %lld -> %lld\n", inode,
1647                      inode->i_size, attr->ia_size);
1648                 if (attr->ia_size > inode->i_sb->s_maxbytes) {
1649                         err = -EINVAL;
1650                         goto out;
1651                 }
1652                 if ((issued & CEPH_CAP_FILE_EXCL) &&
1653                     attr->ia_size > inode->i_size) {
1654                         inode->i_size = attr->ia_size;
1655                         inode->i_blocks =
1656                                 (attr->ia_size + (1 << 9) - 1) >> 9;
1657                         inode->i_ctime = attr->ia_ctime;
1658                         ci->i_reported_size = attr->ia_size;
1659                         dirtied |= CEPH_CAP_FILE_EXCL;
1660                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1661                            attr->ia_size != inode->i_size) {
1662                         req->r_args.setattr.size = cpu_to_le64(attr->ia_size);
1663                         req->r_args.setattr.old_size =
1664                                 cpu_to_le64(inode->i_size);
1665                         mask |= CEPH_SETATTR_SIZE;
1666                         release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD |
1667                                 CEPH_CAP_FILE_WR;
1668                 }
1669         }
1670
1671         /* these do nothing */
1672         if (ia_valid & ATTR_CTIME) {
1673                 bool only = (ia_valid & (ATTR_SIZE|ATTR_MTIME|ATTR_ATIME|
1674                                          ATTR_MODE|ATTR_UID|ATTR_GID)) == 0;
1675                 dout("setattr %p ctime %ld.%ld -> %ld.%ld (%s)\n", inode,
1676                      inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
1677                      attr->ia_ctime.tv_sec, attr->ia_ctime.tv_nsec,
1678                      only ? "ctime only" : "ignored");
1679                 inode->i_ctime = attr->ia_ctime;
1680                 if (only) {
1681                         /*
1682                          * if kernel wants to dirty ctime but nothing else,
1683                          * we need to choose a cap to dirty under, or do
1684                          * a almost-no-op setattr
1685                          */
1686                         if (issued & CEPH_CAP_AUTH_EXCL)
1687                                 dirtied |= CEPH_CAP_AUTH_EXCL;
1688                         else if (issued & CEPH_CAP_FILE_EXCL)
1689                                 dirtied |= CEPH_CAP_FILE_EXCL;
1690                         else if (issued & CEPH_CAP_XATTR_EXCL)
1691                                 dirtied |= CEPH_CAP_XATTR_EXCL;
1692                         else
1693                                 mask |= CEPH_SETATTR_CTIME;
1694                 }
1695         }
1696         if (ia_valid & ATTR_FILE)
1697                 dout("setattr %p ATTR_FILE ... hrm!\n", inode);
1698
1699         if (dirtied) {
1700                 __ceph_mark_dirty_caps(ci, dirtied);
1701                 inode->i_ctime = CURRENT_TIME;
1702         }
1703
1704         release &= issued;
1705         spin_unlock(&inode->i_lock);
1706
1707         if (mask) {
1708                 req->r_inode = igrab(inode);
1709                 req->r_inode_drop = release;
1710                 req->r_args.setattr.mask = cpu_to_le32(mask);
1711                 req->r_num_caps = 1;
1712                 err = ceph_mdsc_do_request(mdsc, parent_inode, req);
1713         }
1714         dout("setattr %p result=%d (%s locally, %d remote)\n", inode, err,
1715              ceph_cap_string(dirtied), mask);
1716
1717         ceph_mdsc_put_request(req);
1718         __ceph_do_pending_vmtruncate(inode);
1719         return err;
1720 out:
1721         spin_unlock(&inode->i_lock);
1722         ceph_mdsc_put_request(req);
1723         return err;
1724 }
1725
1726 /*
1727  * Verify that we have a lease on the given mask.  If not,
1728  * do a getattr against an mds.
1729  */
1730 int ceph_do_getattr(struct inode *inode, int mask)
1731 {
1732         struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
1733         struct ceph_mds_client *mdsc = fsc->mdsc;
1734         struct ceph_mds_request *req;
1735         int err;
1736
1737         if (ceph_snap(inode) == CEPH_SNAPDIR) {
1738                 dout("do_getattr inode %p SNAPDIR\n", inode);
1739                 return 0;
1740         }
1741
1742         dout("do_getattr inode %p mask %s\n", inode, ceph_cap_string(mask));
1743         if (ceph_caps_issued_mask(ceph_inode(inode), mask, 1))
1744                 return 0;
1745
1746         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
1747         if (IS_ERR(req))
1748                 return PTR_ERR(req);
1749         req->r_inode = igrab(inode);
1750         req->r_num_caps = 1;
1751         req->r_args.getattr.mask = cpu_to_le32(mask);
1752         err = ceph_mdsc_do_request(mdsc, NULL, req);
1753         ceph_mdsc_put_request(req);
1754         dout("do_getattr result=%d\n", err);
1755         return err;
1756 }
1757
1758
1759 /*
1760  * Check inode permissions.  We verify we have a valid value for
1761  * the AUTH cap, then call the generic handler.
1762  */
1763 int ceph_permission(struct inode *inode, int mask)
1764 {
1765         int err = ceph_do_getattr(inode, CEPH_CAP_AUTH_SHARED);
1766
1767         if (!err)
1768                 err = generic_permission(inode, mask, NULL);
1769         return err;
1770 }
1771
1772 /*
1773  * Get all attributes.  Hopefully somedata we'll have a statlite()
1774  * and can limit the fields we require to be accurate.
1775  */
1776 int ceph_getattr(struct vfsmount *mnt, struct dentry *dentry,
1777                  struct kstat *stat)
1778 {
1779         struct inode *inode = dentry->d_inode;
1780         struct ceph_inode_info *ci = ceph_inode(inode);
1781         int err;
1782
1783         err = ceph_do_getattr(inode, CEPH_STAT_CAP_INODE_ALL);
1784         if (!err) {
1785                 generic_fillattr(inode, stat);
1786                 stat->ino = inode->i_ino;
1787                 if (ceph_snap(inode) != CEPH_NOSNAP)
1788                         stat->dev = ceph_snap(inode);
1789                 else
1790                         stat->dev = 0;
1791                 if (S_ISDIR(inode->i_mode)) {
1792                         stat->size = ci->i_rbytes;
1793                         stat->blocks = 0;
1794                         stat->blksize = 65536;
1795                 }
1796         }
1797         return err;
1798 }