fs/ceph/inode.c

   1 #include <linux/ceph/ceph_debug.h>
   2
   3 #include <linux/module.h>
   4 #include <linux/fs.h>
   5 #include <linux/slab.h>
   6 #include <linux/string.h>
   7 #include <linux/uaccess.h>
   8 #include <linux/kernel.h>
   9 #include <linux/namei.h>
  10 #include <linux/writeback.h>
  11 #include <linux/vmalloc.h>
  12 #include <linux/pagevec.h>
  13
  14 #include "super.h"
  15 #include "mds_client.h"
  16 #include <linux/ceph/decode.h>
  17
  18 /*
  19  * Ceph inode operations
  20  *
  21  * Implement basic inode helpers (get, alloc) and inode ops (getattr,
  22  * setattr, etc.), xattr helpers, and helpers for assimilating
  23  * metadata returned by the MDS into our cache.
  24  *
  25  * Also define helpers for doing asynchronous writeback, invalidation,
  26  * and truncation for the benefit of those who can't afford to block
  27  * (typically because they are in the message handler path).
  28  */
  29
  30 static const struct inode_operations ceph_symlink_iops;
  31
  32 static void ceph_invalidate_work(struct work_struct *work);
  33 static void ceph_writeback_work(struct work_struct *work);
  34 static void ceph_vmtruncate_work(struct work_struct *work);
  35
  36 /*
  37  * find or create an inode, given the ceph ino number
  38  */
  39 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         memset(&ci->i_dir_layout, 0, sizeof(ci->i_dir_layout));
 301
 302         ci->i_fragtree = RB_ROOT;
 303         mutex_init(&ci->i_fragtree_mutex);
 304
 305         ci->i_xattrs.blob = NULL;
 306         ci->i_xattrs.prealloc_blob = NULL;
 307         ci->i_xattrs.dirty = false;
 308         ci->i_xattrs.index = RB_ROOT;
 309         ci->i_xattrs.count = 0;
 310         ci->i_xattrs.names_size = 0;
 311         ci->i_xattrs.vals_size = 0;
 312         ci->i_xattrs.version = 0;
 313         ci->i_xattrs.index_version = 0;
 314
 315         ci->i_caps = RB_ROOT;
 316         ci->i_auth_cap = NULL;
 317         ci->i_dirty_caps = 0;
 318         ci->i_flushing_caps = 0;
 319         INIT_LIST_HEAD(&ci->i_dirty_item);
 320         INIT_LIST_HEAD(&ci->i_flushing_item);
 321         ci->i_cap_flush_seq = 0;
 322         ci->i_cap_flush_last_tid = 0;
 323         memset(&ci->i_cap_flush_tid, 0, sizeof(ci->i_cap_flush_tid));
 324         init_waitqueue_head(&ci->i_cap_wq);
 325         ci->i_hold_caps_min = 0;
 326         ci->i_hold_caps_max = 0;
 327         INIT_LIST_HEAD(&ci->i_cap_delay_list);
 328         ci->i_cap_exporting_mds = 0;
 329         ci->i_cap_exporting_mseq = 0;
 330         ci->i_cap_exporting_issued = 0;
 331         INIT_LIST_HEAD(&ci->i_cap_snaps);
 332         ci->i_head_snapc = NULL;
 333         ci->i_snap_caps = 0;
 334
 335         for (i = 0; i < CEPH_FILE_MODE_NUM; i++)
 336                 ci->i_nr_by_mode[i] = 0;
 337
 338         ci->i_truncate_seq = 0;
 339         ci->i_truncate_size = 0;
 340         ci->i_truncate_pending = 0;
 341
 342         ci->i_max_size = 0;
 343         ci->i_reported_size = 0;
 344         ci->i_wanted_max_size = 0;
 345         ci->i_requested_max_size = 0;
 346
 347         ci->i_pin_ref = 0;
 348         ci->i_rd_ref = 0;
 349         ci->i_rdcache_ref = 0;
 350         ci->i_wr_ref = 0;
 351         ci->i_wrbuffer_ref = 0;
 352         ci->i_wrbuffer_ref_head = 0;
 353         ci->i_shared_gen = 0;
 354         ci->i_rdcache_gen = 0;
 355         ci->i_rdcache_revoking = 0;
 356
 357         INIT_LIST_HEAD(&ci->i_unsafe_writes);
 358         INIT_LIST_HEAD(&ci->i_unsafe_dirops);
 359         spin_lock_init(&ci->i_unsafe_lock);
 360
 361         ci->i_snap_realm = NULL;
 362         INIT_LIST_HEAD(&ci->i_snap_realm_item);
 363         INIT_LIST_HEAD(&ci->i_snap_flush_item);
 364
 365         INIT_WORK(&ci->i_wb_work, ceph_writeback_work);
 366         INIT_WORK(&ci->i_pg_inv_work, ceph_invalidate_work);
 367
 368         INIT_WORK(&ci->i_vmtruncate_work, ceph_vmtruncate_work);
 369
 370         return &ci->vfs_inode;
 371 }
 372
 373 void ceph_destroy_inode(struct inode *inode)
 374 {
 375         struct ceph_inode_info *ci = ceph_inode(inode);
 376         struct ceph_inode_frag *frag;
 377         struct rb_node *n;
 378
 379         dout("destroy_inode %p ino %llx.%llx\n", inode, ceph_vinop(inode));
 380
 381         ceph_queue_caps_release(inode);
 382
 383         /*
 384          * we may still have a snap_realm reference if there are stray
 385          * caps in i_cap_exporting_issued or i_snap_caps.
 386          */
 387         if (ci->i_snap_realm) {
 388                 struct ceph_mds_client *mdsc =
 389                         ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc;
 390                 struct ceph_snap_realm *realm = ci->i_snap_realm;
 391
 392                 dout(" dropping residual ref to snap realm %p\n", realm);
 393                 spin_lock(&realm->inodes_with_caps_lock);
 394                 list_del_init(&ci->i_snap_realm_item);
 395                 spin_unlock(&realm->inodes_with_caps_lock);
 396                 ceph_put_snap_realm(mdsc, realm);
 397         }
 398
 399         kfree(ci->i_symlink);
 400         while ((n = rb_first(&ci->i_fragtree)) != NULL) {
 401                 frag = rb_entry(n, struct ceph_inode_frag, node);
 402                 rb_erase(n, &ci->i_fragtree);
 403                 kfree(frag);
 404         }
 405
 406         __ceph_destroy_xattrs(ci);
 407         if (ci->i_xattrs.blob)
 408                 ceph_buffer_put(ci->i_xattrs.blob);
 409         if (ci->i_xattrs.prealloc_blob)
 410                 ceph_buffer_put(ci->i_xattrs.prealloc_blob);
 411
 412         kmem_cache_free(ceph_inode_cachep, ci);
 413 }
 414
 415
 416 /*
 417  * Helpers to fill in size, ctime, mtime, and atime.  We have to be
 418  * careful because either the client or MDS may have more up to date
 419  * info, depending on which capabilities are held, and whether
 420  * time_warp_seq or truncate_seq have increased.  (Ordinarily, mtime
 421  * and size are monotonically increasing, except when utimes() or
 422  * truncate() increments the corresponding _seq values.)
 423  */
 424 int ceph_fill_file_size(struct inode *inode, int issued,
 425                         u32 truncate_seq, u64 truncate_size, u64 size)
 426 {
 427         struct ceph_inode_info *ci = ceph_inode(inode);
 428         int queue_trunc = 0;
 429
 430         if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) > 0 ||
 431             (truncate_seq == ci->i_truncate_seq && size > inode->i_size)) {
 432                 dout("size %lld -> %llu\n", inode->i_size, size);
 433                 inode->i_size = size;
 434                 inode->i_blocks = (size + (1<<9) - 1) >> 9;
 435                 ci->i_reported_size = size;
 436                 if (truncate_seq != ci->i_truncate_seq) {
 437                         dout("truncate_seq %u -> %u\n",
 438                              ci->i_truncate_seq, truncate_seq);
 439                         ci->i_truncate_seq = truncate_seq;
 440                         /*
 441                          * If we hold relevant caps, or in the case where we're
 442                          * not the only client referencing this file and we
 443                          * don't hold those caps, then we need to check whether
 444                          * the file is either opened or mmaped
 445                          */
 446                         if ((issued & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_RD|
 447                                        CEPH_CAP_FILE_WR|CEPH_CAP_FILE_BUFFER|
 448                                        CEPH_CAP_FILE_EXCL|
 449                                        CEPH_CAP_FILE_LAZYIO)) ||
 450                             mapping_mapped(inode->i_mapping) ||
 451                             __ceph_caps_file_wanted(ci)) {
 452                                 ci->i_truncate_pending++;
 453                                 queue_trunc = 1;
 454                         }
 455                 }
 456         }
 457         if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) >= 0 &&
 458             ci->i_truncate_size != truncate_size) {
 459                 dout("truncate_size %lld -> %llu\n", ci->i_truncate_size,
 460                      truncate_size);
 461                 ci->i_truncate_size = truncate_size;
 462         }
 463         return queue_trunc;
 464 }
 465
 466 void ceph_fill_file_time(struct inode *inode, int issued,
 467                          u64 time_warp_seq, struct timespec *ctime,
 468                          struct timespec *mtime, struct timespec *atime)
 469 {
 470         struct ceph_inode_info *ci = ceph_inode(inode);
 471         int warn = 0;
 472
 473         if (issued & (CEPH_CAP_FILE_EXCL|
 474                       CEPH_CAP_FILE_WR|
 475                       CEPH_CAP_FILE_BUFFER|
 476                       CEPH_CAP_AUTH_EXCL|
 477                       CEPH_CAP_XATTR_EXCL)) {
 478                 if (timespec_compare(ctime, &inode->i_ctime) > 0) {
 479                         dout("ctime %ld.%09ld -> %ld.%09ld inc w/ cap\n",
 480                              inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
 481                              ctime->tv_sec, ctime->tv_nsec);
 482                         inode->i_ctime = *ctime;
 483                 }
 484                 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) > 0) {
 485                         /* the MDS did a utimes() */
 486                         dout("mtime %ld.%09ld -> %ld.%09ld "
 487                              "tw %d -> %d\n",
 488                              inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
 489                              mtime->tv_sec, mtime->tv_nsec,
 490                              ci->i_time_warp_seq, (int)time_warp_seq);
 491
 492                         inode->i_mtime = *mtime;
 493                         inode->i_atime = *atime;
 494                         ci->i_time_warp_seq = time_warp_seq;
 495                 } else if (time_warp_seq == ci->i_time_warp_seq) {
 496                         /* nobody did utimes(); take the max */
 497                         if (timespec_compare(mtime, &inode->i_mtime) > 0) {
 498                                 dout("mtime %ld.%09ld -> %ld.%09ld inc\n",
 499                                      inode->i_mtime.tv_sec,
 500                                      inode->i_mtime.tv_nsec,
 501                                      mtime->tv_sec, mtime->tv_nsec);
 502                                 inode->i_mtime = *mtime;
 503                         }
 504                         if (timespec_compare(atime, &inode->i_atime) > 0) {
 505                                 dout("atime %ld.%09ld -> %ld.%09ld inc\n",
 506                                      inode->i_atime.tv_sec,
 507                                      inode->i_atime.tv_nsec,
 508                                      atime->tv_sec, atime->tv_nsec);
 509                                 inode->i_atime = *atime;
 510                         }
 511                 } else if (issued & CEPH_CAP_FILE_EXCL) {
 512                         /* we did a utimes(); ignore mds values */
 513                 } else {
 514                         warn = 1;
 515                 }
 516         } else {
 517                 /* we have no write|excl caps; whatever the MDS says is true */
 518                 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) >= 0) {
 519                         inode->i_ctime = *ctime;
 520                         inode->i_mtime = *mtime;
 521                         inode->i_atime = *atime;
 522                         ci->i_time_warp_seq = time_warp_seq;
 523                 } else {
 524                         warn = 1;
 525                 }
 526         }
 527         if (warn) /* time_warp_seq shouldn't go backwards */
 528                 dout("%p mds time_warp_seq %llu < %u\n",
 529                      inode, time_warp_seq, ci->i_time_warp_seq);
 530 }
 531
 532 /*
 533  * Populate an inode based on info from mds.  May be called on new or
 534  * existing inodes.
 535  */
 536 static int fill_inode(struct inode *inode,
 537                       struct ceph_mds_reply_info_in *iinfo,
 538                       struct ceph_mds_reply_dirfrag *dirinfo,
 539                       struct ceph_mds_session *session,
 540                       unsigned long ttl_from, int cap_fmode,
 541                       struct ceph_cap_reservation *caps_reservation)
 542 {
 543         struct ceph_mds_reply_inode *info = iinfo->in;
 544         struct ceph_inode_info *ci = ceph_inode(inode);
 545         int i;
 546         int issued, implemented;
 547         struct timespec mtime, atime, ctime;
 548         u32 nsplits;
 549         struct ceph_buffer *xattr_blob = NULL;
 550         int err = 0;
 551         int queue_trunc = 0;
 552
 553         dout("fill_inode %p ino %llx.%llx v %llu had %llu\n",
 554              inode, ceph_vinop(inode), le64_to_cpu(info->version),
 555              ci->i_version);
 556
 557         /*
 558          * prealloc xattr data, if it looks like we'll need it.  only
 559          * if len > 4 (meaning there are actually xattrs; the first 4
 560          * bytes are the xattr count).
 561          */
 562         if (iinfo->xattr_len > 4) {
 563                 xattr_blob = ceph_buffer_new(iinfo->xattr_len, GFP_NOFS);
 564                 if (!xattr_blob)
 565                         pr_err("fill_inode ENOMEM xattr blob %d bytes\n",
 566                                iinfo->xattr_len);
 567         }
 568
 569         spin_lock(&inode->i_lock);
 570
 571         /*
 572          * provided version will be odd if inode value is projected,
 573          * even if stable.  skip the update if we have newer stable
 574          * info (ours>=theirs, e.g. due to racing mds replies), unless
 575          * we are getting projected (unstable) info (in which case the
 576          * version is odd, and we want ours>theirs).
 577          *   us   them
 578          *   2    2     skip
 579          *   3    2     skip
 580          *   3    3     update
 581          */
 582         if (le64_to_cpu(info->version) > 0 &&
 583             (ci->i_version & ~1) >= le64_to_cpu(info->version))
 584                 goto no_change;
 585
 586         issued = __ceph_caps_issued(ci, &implemented);
 587         issued |= implemented | __ceph_caps_dirty(ci);
 588
 589         /* update inode */
 590         ci->i_version = le64_to_cpu(info->version);
 591         inode->i_version++;
 592         inode->i_rdev = le32_to_cpu(info->rdev);
 593
 594         if ((issued & CEPH_CAP_AUTH_EXCL) == 0) {
 595                 inode->i_mode = le32_to_cpu(info->mode);
 596                 inode->i_uid = le32_to_cpu(info->uid);
 597                 inode->i_gid = le32_to_cpu(info->gid);
 598                 dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode,
 599                      inode->i_uid, inode->i_gid);
 600         }
 601
 602         if ((issued & CEPH_CAP_LINK_EXCL) == 0)
 603                 inode->i_nlink = le32_to_cpu(info->nlink);
 604
 605         /* be careful with mtime, atime, size */
 606         ceph_decode_timespec(&atime, &info->atime);
 607         ceph_decode_timespec(&mtime, &info->mtime);
 608         ceph_decode_timespec(&ctime, &info->ctime);
 609         queue_trunc = ceph_fill_file_size(inode, issued,
 610                                           le32_to_cpu(info->truncate_seq),
 611                                           le64_to_cpu(info->truncate_size),
 612                                           le64_to_cpu(info->size));
 613         ceph_fill_file_time(inode, issued,
 614                             le32_to_cpu(info->time_warp_seq),
 615                             &ctime, &mtime, &atime);
 616
 617         /* only update max_size on auth cap */
 618         if ((info->cap.flags & CEPH_CAP_FLAG_AUTH) &&
 619             ci->i_max_size != le64_to_cpu(info->max_size)) {
 620                 dout("max_size %lld -> %llu\n", ci->i_max_size,
 621                      le64_to_cpu(info->max_size));
 622                 ci->i_max_size = le64_to_cpu(info->max_size);
 623         }
 624
 625         ci->i_layout = info->layout;
 626         inode->i_blkbits = fls(le32_to_cpu(info->layout.fl_stripe_unit)) - 1;
 627
 628         /* xattrs */
 629         /* note that if i_xattrs.len <= 4, i_xattrs.data will still be NULL. */
 630         if ((issued & CEPH_CAP_XATTR_EXCL) == 0 &&
 631             le64_to_cpu(info->xattr_version) > ci->i_xattrs.version) {
 632                 if (ci->i_xattrs.blob)
 633                         ceph_buffer_put(ci->i_xattrs.blob);
 634                 ci->i_xattrs.blob = xattr_blob;
 635                 if (xattr_blob)
 636                         memcpy(ci->i_xattrs.blob->vec.iov_base,
 637                                iinfo->xattr_data, iinfo->xattr_len);
 638                 ci->i_xattrs.version = le64_to_cpu(info->xattr_version);
 639                 xattr_blob = NULL;
 640         }
 641
 642         inode->i_mapping->a_ops = &ceph_aops;
 643         inode->i_mapping->backing_dev_info =
 644                 &ceph_sb_to_client(inode->i_sb)->backing_dev_info;
 645
 646         switch (inode->i_mode & S_IFMT) {
 647         case S_IFIFO:
 648         case S_IFBLK:
 649         case S_IFCHR:
 650         case S_IFSOCK:
 651                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
 652                 inode->i_op = &ceph_file_iops;
 653                 break;
 654         case S_IFREG:
 655                 inode->i_op = &ceph_file_iops;
 656                 inode->i_fop = &ceph_file_fops;
 657                 break;
 658         case S_IFLNK:
 659                 inode->i_op = &ceph_symlink_iops;
 660                 if (!ci->i_symlink) {
 661                         int symlen = iinfo->symlink_len;
 662                         char *sym;
 663
 664                         BUG_ON(symlen != inode->i_size);
 665                         spin_unlock(&inode->i_lock);
 666
 667                         err = -ENOMEM;
 668                         sym = kmalloc(symlen+1, GFP_NOFS);
 669                         if (!sym)
 670                                 goto out;
 671                         memcpy(sym, iinfo->symlink, symlen);
 672                         sym[symlen] = 0;
 673
 674                         spin_lock(&inode->i_lock);
 675                         if (!ci->i_symlink)
 676                                 ci->i_symlink = sym;
 677                         else
 678                                 kfree(sym); /* lost a race */
 679                 }
 680                 break;
 681         case S_IFDIR:
 682                 inode->i_op = &ceph_dir_iops;
 683                 inode->i_fop = &ceph_dir_fops;
 684
 685                 ci->i_dir_layout = iinfo->dir_layout;
 686
 687                 ci->i_files = le64_to_cpu(info->files);
 688                 ci->i_subdirs = le64_to_cpu(info->subdirs);
 689                 ci->i_rbytes = le64_to_cpu(info->rbytes);
 690                 ci->i_rfiles = le64_to_cpu(info->rfiles);
 691                 ci->i_rsubdirs = le64_to_cpu(info->rsubdirs);
 692                 ceph_decode_timespec(&ci->i_rctime, &info->rctime);
 693
 694                 /* set dir completion flag? */
 695                 if (ci->i_files == 0 && ci->i_subdirs == 0 &&
 696                     ceph_snap(inode) == CEPH_NOSNAP &&
 697                     (le32_to_cpu(info->cap.caps) & CEPH_CAP_FILE_SHARED) &&
 698                     (issued & CEPH_CAP_FILE_EXCL) == 0 &&
 699                     (ci->i_ceph_flags & CEPH_I_COMPLETE) == 0) {
 700                         dout(" marking %p complete (empty)\n", inode);
 701                         ci->i_ceph_flags |= CEPH_I_COMPLETE;
 702                         ci->i_max_offset = 2;
 703                 }
 704                 break;
 705         default:
 706                 pr_err("fill_inode %llx.%llx BAD mode 0%o\n",
 707                        ceph_vinop(inode), inode->i_mode);
 708         }
 709
 710 no_change:
 711         spin_unlock(&inode->i_lock);
 712
 713         /* queue truncate if we saw i_size decrease */
 714         if (queue_trunc)
 715                 ceph_queue_vmtruncate(inode);
 716
 717         /* populate frag tree */
 718         /* FIXME: move me up, if/when version reflects fragtree changes */
 719         nsplits = le32_to_cpu(info->fragtree.nsplits);
 720         mutex_lock(&ci->i_fragtree_mutex);
 721         for (i = 0; i < nsplits; i++) {
 722                 u32 id = le32_to_cpu(info->fragtree.splits[i].frag);
 723                 struct ceph_inode_frag *frag = __get_or_create_frag(ci, id);
 724
 725                 if (IS_ERR(frag))
 726                         continue;
 727                 frag->split_by = le32_to_cpu(info->fragtree.splits[i].by);
 728                 dout(" frag %x split by %d\n", frag->frag, frag->split_by);
 729         }
 730         mutex_unlock(&ci->i_fragtree_mutex);
 731
 732         /* were we issued a capability? */
 733         if (info->cap.caps) {
 734                 if (ceph_snap(inode) == CEPH_NOSNAP) {
 735                         ceph_add_cap(inode, session,
 736                                      le64_to_cpu(info->cap.cap_id),
 737                                      cap_fmode,
 738                                      le32_to_cpu(info->cap.caps),
 739                                      le32_to_cpu(info->cap.wanted),
 740                                      le32_to_cpu(info->cap.seq),
 741                                      le32_to_cpu(info->cap.mseq),
 742                                      le64_to_cpu(info->cap.realm),
 743                                      info->cap.flags,
 744                                      caps_reservation);
 745                 } else {
 746                         spin_lock(&inode->i_lock);
 747                         dout(" %p got snap_caps %s\n", inode,
 748                              ceph_cap_string(le32_to_cpu(info->cap.caps)));
 749                         ci->i_snap_caps |= le32_to_cpu(info->cap.caps);
 750                         if (cap_fmode >= 0)
 751                                 __ceph_get_fmode(ci, cap_fmode);
 752                         spin_unlock(&inode->i_lock);
 753                 }
 754         } else if (cap_fmode >= 0) {
 755                 pr_warning("mds issued no caps on %llx.%llx\n",
 756                            ceph_vinop(inode));
 757                 __ceph_get_fmode(ci, cap_fmode);
 758         }
 759
 760         /* update delegation info? */
 761         if (dirinfo)
 762                 ceph_fill_dirfrag(inode, dirinfo);
 763
 764         err = 0;
 765
 766 out:
 767         if (xattr_blob)
 768                 ceph_buffer_put(xattr_blob);
 769         return err;
 770 }
 771
 772 /*
 773  * caller should hold session s_mutex.
 774  */
 775 static void update_dentry_lease(struct dentry *dentry,
 776                                 struct ceph_mds_reply_lease *lease,
 777                                 struct ceph_mds_session *session,
 778                                 unsigned long from_time)
 779 {
 780         struct ceph_dentry_info *di = ceph_dentry(dentry);
 781         long unsigned duration = le32_to_cpu(lease->duration_ms);
 782         long unsigned ttl = from_time + (duration * HZ) / 1000;
 783         long unsigned half_ttl = from_time + (duration * HZ / 2) / 1000;
 784         struct inode *dir;
 785
 786         /* only track leases on regular dentries */
 787         if (dentry->d_op != &ceph_dentry_ops)
 788                 return;
 789
 790         spin_lock(&dentry->d_lock);
 791         dout("update_dentry_lease %p mask %d duration %lu ms ttl %lu\n",
 792              dentry, le16_to_cpu(lease->mask), duration, ttl);
 793
 794         /* make lease_rdcache_gen match directory */
 795         dir = dentry->d_parent->d_inode;
 796         di->lease_shared_gen = ceph_inode(dir)->i_shared_gen;
 797
 798         if (lease->mask == 0)
 799                 goto out_unlock;
 800
 801         if (di->lease_gen == session->s_cap_gen &&
 802             time_before(ttl, dentry->d_time))
 803                 goto out_unlock;  /* we already have a newer lease. */
 804
 805         if (di->lease_session && di->lease_session != session)
 806                 goto out_unlock;
 807
 808         ceph_dentry_lru_touch(dentry);
 809
 810         if (!di->lease_session)
 811                 di->lease_session = ceph_get_mds_session(session);
 812         di->lease_gen = session->s_cap_gen;
 813         di->lease_seq = le32_to_cpu(lease->seq);
 814         di->lease_renew_after = half_ttl;
 815         di->lease_renew_from = 0;
 816         dentry->d_time = ttl;
 817 out_unlock:
 818         spin_unlock(&dentry->d_lock);
 819         return;
 820 }
 821
 822 /*
 823  * Set dentry's directory position based on the current dir's max, and
 824  * order it in d_subdirs, so that dcache_readdir behaves.
 825  */
 826 static void ceph_set_dentry_offset(struct dentry *dn)
 827 {
 828         struct dentry *dir = dn->d_parent;
 829         struct inode *inode = dn->d_parent->d_inode;
 830         struct ceph_dentry_info *di;
 831
 832         BUG_ON(!inode);
 833
 834         di = ceph_dentry(dn);
 835
 836         spin_lock(&inode->i_lock);
 837         if ((ceph_inode(inode)->i_ceph_flags & CEPH_I_COMPLETE) == 0) {
 838                 spin_unlock(&inode->i_lock);
 839                 return;
 840         }
 841         di->offset = ceph_inode(inode)->i_max_offset++;
 842         spin_unlock(&inode->i_lock);
 843
 844         spin_lock(&dcache_lock);
 845         spin_lock(&dn->d_lock);
 846         list_move(&dn->d_u.d_child, &dir->d_subdirs);
 847         dout("set_dentry_offset %p %lld (%p %p)\n", dn, di->offset,
 848              dn->d_u.d_child.prev, dn->d_u.d_child.next);
 849         spin_unlock(&dn->d_lock);
 850         spin_unlock(&dcache_lock);
 851 }
 852
 853 /*
 854  * splice a dentry to an inode.
 855  * caller must hold directory i_mutex for this to be safe.
 856  *
 857  * we will only rehash the resulting dentry if @prehash is
 858  * true; @prehash will be set to false (for the benefit of
 859  * the caller) if we fail.
 860  */
 861 static struct dentry *splice_dentry(struct dentry *dn, struct inode *in,
 862                                     bool *prehash, bool set_offset)
 863 {
 864         struct dentry *realdn;
 865
 866         BUG_ON(dn->d_inode);
 867
 868         /* dn must be unhashed */
 869         if (!d_unhashed(dn))
 870                 d_drop(dn);
 871         realdn = d_materialise_unique(dn, in);
 872         if (IS_ERR(realdn)) {
 873                 pr_err("splice_dentry error %ld %p inode %p ino %llx.%llx\n",
 874                        PTR_ERR(realdn), dn, in, ceph_vinop(in));
 875                 if (prehash)
 876                         *prehash = false; /* don't rehash on error */
 877                 dn = realdn; /* note realdn contains the error */
 878                 goto out;
 879         } else if (realdn) {
 880                 dout("dn %p (%d) spliced with %p (%d) "
 881                      "inode %p ino %llx.%llx\n",
 882                      dn, atomic_read(&dn->d_count),
 883                      realdn, atomic_read(&realdn->d_count),
 884                      realdn->d_inode, ceph_vinop(realdn->d_inode));
 885                 dput(dn);
 886                 dn = realdn;
 887         } else {
 888                 BUG_ON(!ceph_dentry(dn));
 889                 dout("dn %p attached to %p ino %llx.%llx\n",
 890                      dn, dn->d_inode, ceph_vinop(dn->d_inode));
 891         }
 892         if ((!prehash || *prehash) && d_unhashed(dn))
 893                 d_rehash(dn);
 894         if (set_offset)
 895                 ceph_set_dentry_offset(dn);
 896 out:
 897         return dn;
 898 }
 899
 900 /*
 901  * Incorporate results into the local cache.  This is either just
 902  * one inode, or a directory, dentry, and possibly linked-to inode (e.g.,
 903  * after a lookup).
 904  *
 905  * A reply may contain
 906  *         a directory inode along with a dentry.
 907  *  and/or a target inode
 908  *
 909  * Called with snap_rwsem (read).
 910  */
 911 int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req,
 912                     struct ceph_mds_session *session)
 913 {
 914         struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
 915         struct inode *in = NULL;
 916         struct ceph_mds_reply_inode *ininfo;
 917         struct ceph_vino vino;
 918         struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
 919         int i = 0;
 920         int err = 0;
 921
 922         dout("fill_trace %p is_dentry %d is_target %d\n", req,
 923              rinfo->head->is_dentry, rinfo->head->is_target);
 924
 925 #if 0
 926         /*
 927          * Debugging hook:
 928          *
 929          * If we resend completed ops to a recovering mds, we get no
 930          * trace.  Since that is very rare, pretend this is the case
 931          * to ensure the 'no trace' handlers in the callers behave.
 932          *
 933          * Fill in inodes unconditionally to avoid breaking cap
 934          * invariants.
 935          */
 936         if (rinfo->head->op & CEPH_MDS_OP_WRITE) {
 937                 pr_info("fill_trace faking empty trace on %lld %s\n",
 938                         req->r_tid, ceph_mds_op_name(rinfo->head->op));
 939                 if (rinfo->head->is_dentry) {
 940                         rinfo->head->is_dentry = 0;
 941                         err = fill_inode(req->r_locked_dir,
 942                                          &rinfo->diri, rinfo->dirfrag,
 943                                          session, req->r_request_started, -1);
 944                 }
 945                 if (rinfo->head->is_target) {
 946                         rinfo->head->is_target = 0;
 947                         ininfo = rinfo->targeti.in;
 948                         vino.ino = le64_to_cpu(ininfo->ino);
 949                         vino.snap = le64_to_cpu(ininfo->snapid);
 950                         in = ceph_get_inode(sb, vino);
 951                         err = fill_inode(in, &rinfo->targeti, NULL,
 952                                          session, req->r_request_started,
 953                                          req->r_fmode);
 954                         iput(in);
 955                 }
 956         }
 957 #endif
 958
 959         if (!rinfo->head->is_target && !rinfo->head->is_dentry) {
 960                 dout("fill_trace reply is empty!\n");
 961                 if (rinfo->head->result == 0 && req->r_locked_dir)
 962                         ceph_invalidate_dir_request(req);
 963                 return 0;
 964         }
 965
 966         if (rinfo->head->is_dentry) {
 967                 struct inode *dir = req->r_locked_dir;
 968
 969                 err = fill_inode(dir, &rinfo->diri, rinfo->dirfrag,
 970                                  session, req->r_request_started, -1,
 971                                  &req->r_caps_reservation);
 972                 if (err < 0)
 973                         return err;
 974         }
 975
 976         /*
 977          * ignore null lease/binding on snapdir ENOENT, or else we
 978          * will have trouble splicing in the virtual snapdir later
 979          */
 980         if (rinfo->head->is_dentry && !req->r_aborted &&
 981             (rinfo->head->is_target || strncmp(req->r_dentry->d_name.name,
 982                                                fsc->mount_options->snapdir_name,
 983                                                req->r_dentry->d_name.len))) {
 984                 /*
 985                  * lookup link rename   : null -> possibly existing inode
 986                  * mknod symlink mkdir  : null -> new inode
 987                  * unlink               : linked -> null
 988                  */
 989                 struct inode *dir = req->r_locked_dir;
 990                 struct dentry *dn = req->r_dentry;
 991                 bool have_dir_cap, have_lease;
 992
 993                 BUG_ON(!dn);
 994                 BUG_ON(!dir);
 995                 BUG_ON(dn->d_parent->d_inode != dir);
 996                 BUG_ON(ceph_ino(dir) !=
 997                        le64_to_cpu(rinfo->diri.in->ino));
 998                 BUG_ON(ceph_snap(dir) !=
 999                        le64_to_cpu(rinfo->diri.in->snapid));
1000
1001                 /* do we have a lease on the whole dir? */
1002                 have_dir_cap =
1003                         (le32_to_cpu(rinfo->diri.in->cap.caps) &
1004                          CEPH_CAP_FILE_SHARED);
1005
1006                 /* do we have a dn lease? */
1007                 have_lease = have_dir_cap ||
1008                         (le16_to_cpu(rinfo->dlease->mask) &
1009                          CEPH_LOCK_DN);
1010
1011                 if (!have_lease)
1012                         dout("fill_trace  no dentry lease or dir cap\n");
1013
1014                 /* rename? */
1015                 if (req->r_old_dentry && req->r_op == CEPH_MDS_OP_RENAME) {
1016                         dout(" src %p '%.*s' dst %p '%.*s'\n",
1017                              req->r_old_dentry,
1018                              req->r_old_dentry->d_name.len,
1019                              req->r_old_dentry->d_name.name,
1020                              dn, dn->d_name.len, dn->d_name.name);
1021                         dout("fill_trace doing d_move %p -> %p\n",
1022                              req->r_old_dentry, dn);
1023
1024                         /* d_move screws up d_subdirs order */
1025                         ceph_i_clear(dir, CEPH_I_COMPLETE);
1026
1027                         d_move(req->r_old_dentry, dn);
1028                         dout(" src %p '%.*s' dst %p '%.*s'\n",
1029                              req->r_old_dentry,
1030                              req->r_old_dentry->d_name.len,
1031                              req->r_old_dentry->d_name.name,
1032                              dn, dn->d_name.len, dn->d_name.name);
1033
1034                         /* ensure target dentry is invalidated, despite
1035                            rehashing bug in vfs_rename_dir */
1036                         ceph_invalidate_dentry_lease(dn);
1037
1038                         /* take overwritten dentry's readdir offset */
1039                         dout("dn %p gets %p offset %lld (old offset %lld)\n",
1040                              req->r_old_dentry, dn, ceph_dentry(dn)->offset,
1041                              ceph_dentry(req->r_old_dentry)->offset);
1042                         ceph_dentry(req->r_old_dentry)->offset =
1043                                 ceph_dentry(dn)->offset;
1044
1045                         dn = req->r_old_dentry;  /* use old_dentry */
1046                         in = dn->d_inode;
1047                 }
1048
1049                 /* null dentry? */
1050                 if (!rinfo->head->is_target) {
1051                         dout("fill_trace null dentry\n");
1052                         if (dn->d_inode) {
1053                                 dout("d_delete %p\n", dn);
1054                                 d_delete(dn);
1055                         } else {
1056                                 dout("d_instantiate %p NULL\n", dn);
1057                                 d_instantiate(dn, NULL);
1058                                 if (have_lease && d_unhashed(dn))
1059                                         d_rehash(dn);
1060                                 update_dentry_lease(dn, rinfo->dlease,
1061                                                     session,
1062                                                     req->r_request_started);
1063                         }
1064                         goto done;
1065                 }
1066
1067                 /* attach proper inode */
1068                 ininfo = rinfo->targeti.in;
1069                 vino.ino = le64_to_cpu(ininfo->ino);
1070                 vino.snap = le64_to_cpu(ininfo->snapid);
1071                 in = dn->d_inode;
1072                 if (!in) {
1073                         in = ceph_get_inode(sb, vino);
1074                         if (IS_ERR(in)) {
1075                                 pr_err("fill_trace bad get_inode "
1076                                        "%llx.%llx\n", vino.ino, vino.snap);
1077                                 err = PTR_ERR(in);
1078                                 d_delete(dn);
1079                                 goto done;
1080                         }
1081                         dn = splice_dentry(dn, in, &have_lease, true);
1082                         if (IS_ERR(dn)) {
1083                                 err = PTR_ERR(dn);
1084                                 goto done;
1085                         }
1086                         req->r_dentry = dn;  /* may have spliced */
1087                         igrab(in);
1088                 } else if (ceph_ino(in) == vino.ino &&
1089                            ceph_snap(in) == vino.snap) {
1090                         igrab(in);
1091                 } else {
1092                         dout(" %p links to %p %llx.%llx, not %llx.%llx\n",
1093                              dn, in, ceph_ino(in), ceph_snap(in),
1094                              vino.ino, vino.snap);
1095                         have_lease = false;
1096                         in = NULL;
1097                 }
1098
1099                 if (have_lease)
1100                         update_dentry_lease(dn, rinfo->dlease, session,
1101                                             req->r_request_started);
1102                 dout(" final dn %p\n", dn);
1103                 i++;
1104         } else if (req->r_op == CEPH_MDS_OP_LOOKUPSNAP ||
1105                    req->r_op == CEPH_MDS_OP_MKSNAP) {
1106                 struct dentry *dn = req->r_dentry;
1107
1108                 /* fill out a snapdir LOOKUPSNAP dentry */
1109                 BUG_ON(!dn);
1110                 BUG_ON(!req->r_locked_dir);
1111                 BUG_ON(ceph_snap(req->r_locked_dir) != CEPH_SNAPDIR);
1112                 ininfo = rinfo->targeti.in;
1113                 vino.ino = le64_to_cpu(ininfo->ino);
1114                 vino.snap = le64_to_cpu(ininfo->snapid);
1115                 in = ceph_get_inode(sb, vino);
1116                 if (IS_ERR(in)) {
1117                         pr_err("fill_inode get_inode badness %llx.%llx\n",
1118                                vino.ino, vino.snap);
1119                         err = PTR_ERR(in);
1120                         d_delete(dn);
1121                         goto done;
1122                 }
1123                 dout(" linking snapped dir %p to dn %p\n", in, dn);
1124                 dn = splice_dentry(dn, in, NULL, true);
1125                 if (IS_ERR(dn)) {
1126                         err = PTR_ERR(dn);
1127                         goto done;
1128                 }
1129                 req->r_dentry = dn;  /* may have spliced */
1130                 igrab(in);
1131                 rinfo->head->is_dentry = 1;  /* fool notrace handlers */
1132         }
1133
1134         if (rinfo->head->is_target) {
1135                 vino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1136                 vino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1137
1138                 if (in == NULL || ceph_ino(in) != vino.ino ||
1139                     ceph_snap(in) != vino.snap) {
1140                         in = ceph_get_inode(sb, vino);
1141                         if (IS_ERR(in)) {
1142                                 err = PTR_ERR(in);
1143                                 goto done;
1144                         }
1145                 }
1146                 req->r_target_inode = in;
1147
1148                 err = fill_inode(in,
1149                                  &rinfo->targeti, NULL,
1150                                  session, req->r_request_started,
1151                                  (le32_to_cpu(rinfo->head->result) == 0) ?
1152                                  req->r_fmode : -1,
1153                                  &req->r_caps_reservation);
1154                 if (err < 0) {
1155                         pr_err("fill_inode badness %p %llx.%llx\n",
1156                                in, ceph_vinop(in));
1157                         goto done;
1158                 }
1159         }
1160
1161 done:
1162         dout("fill_trace done err=%d\n", err);
1163         return err;
1164 }
1165
1166 /*
1167  * Prepopulate our cache with readdir results, leases, etc.
1168  */
1169 int ceph_readdir_prepopulate(struct ceph_mds_request *req,
1170                              struct ceph_mds_session *session)
1171 {
1172         struct dentry *parent = req->r_dentry;
1173         struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1174         struct qstr dname;
1175         struct dentry *dn;
1176         struct inode *in;
1177         int err = 0, i;
1178         struct inode *snapdir = NULL;
1179         struct ceph_mds_request_head *rhead = req->r_request->front.iov_base;
1180         u64 frag = le32_to_cpu(rhead->args.readdir.frag);
1181         struct ceph_dentry_info *di;
1182
1183         if (le32_to_cpu(rinfo->head->op) == CEPH_MDS_OP_LSSNAP) {
1184                 snapdir = ceph_get_snapdir(parent->d_inode);
1185                 parent = d_find_alias(snapdir);
1186                 dout("readdir_prepopulate %d items under SNAPDIR dn %p\n",
1187                      rinfo->dir_nr, parent);
1188         } else {
1189                 dout("readdir_prepopulate %d items under dn %p\n",
1190                      rinfo->dir_nr, parent);
1191                 if (rinfo->dir_dir)
1192                         ceph_fill_dirfrag(parent->d_inode, rinfo->dir_dir);
1193         }
1194
1195         for (i = 0; i < rinfo->dir_nr; i++) {
1196                 struct ceph_vino vino;
1197
1198                 dname.name = rinfo->dir_dname[i];
1199                 dname.len = rinfo->dir_dname_len[i];
1200                 dname.hash = full_name_hash(dname.name, dname.len);
1201
1202                 vino.ino = le64_to_cpu(rinfo->dir_in[i].in->ino);
1203                 vino.snap = le64_to_cpu(rinfo->dir_in[i].in->snapid);
1204
1205 retry_lookup:
1206                 dn = d_lookup(parent, &dname);
1207                 dout("d_lookup on parent=%p name=%.*s got %p\n",
1208                      parent, dname.len, dname.name, dn);
1209
1210                 if (!dn) {
1211                         dn = d_alloc(parent, &dname);
1212                         dout("d_alloc %p '%.*s' = %p\n", parent,
1213                              dname.len, dname.name, dn);
1214                         if (dn == NULL) {
1215                                 dout("d_alloc badness\n");
1216                                 err = -ENOMEM;
1217                                 goto out;
1218                         }
1219                         err = ceph_init_dentry(dn);
1220                         if (err < 0) {
1221                                 dput(dn);
1222                                 goto out;
1223                         }
1224                 } else if (dn->d_inode &&
1225                            (ceph_ino(dn->d_inode) != vino.ino ||
1226                             ceph_snap(dn->d_inode) != vino.snap)) {
1227                         dout(" dn %p points to wrong inode %p\n",
1228                              dn, dn->d_inode);
1229                         d_delete(dn);
1230                         dput(dn);
1231                         goto retry_lookup;
1232                 } else {
1233                         /* reorder parent's d_subdirs */
1234                         spin_lock(&dcache_lock);
1235                         spin_lock(&dn->d_lock);
1236                         list_move(&dn->d_u.d_child, &parent->d_subdirs);
1237                         spin_unlock(&dn->d_lock);
1238                         spin_unlock(&dcache_lock);
1239                 }
1240
1241                 di = dn->d_fsdata;
1242                 di->offset = ceph_make_fpos(frag, i + req->r_readdir_offset);
1243
1244                 /* inode */
1245                 if (dn->d_inode) {
1246                         in = dn->d_inode;
1247                 } else {
1248                         in = ceph_get_inode(parent->d_sb, vino);
1249                         if (IS_ERR(in)) {
1250                                 dout("new_inode badness\n");
1251                                 d_delete(dn);
1252                                 dput(dn);
1253                                 err = PTR_ERR(in);
1254                                 goto out;
1255                         }
1256                         dn = splice_dentry(dn, in, NULL, false);
1257                         if (IS_ERR(dn))
1258                                 dn = NULL;
1259                 }
1260
1261                 if (fill_inode(in, &rinfo->dir_in[i], NULL, session,
1262                                req->r_request_started, -1,
1263                                &req->r_caps_reservation) < 0) {
1264                         pr_err("fill_inode badness on %p\n", in);
1265                         goto next_item;
1266                 }
1267                 if (dn)
1268                         update_dentry_lease(dn, rinfo->dir_dlease[i],
1269                                             req->r_session,
1270                                             req->r_request_started);
1271 next_item:
1272                 if (dn)
1273                         dput(dn);
1274         }
1275         req->r_did_prepopulate = true;
1276
1277 out:
1278         if (snapdir) {
1279                 iput(snapdir);
1280                 dput(parent);
1281         }
1282         dout("readdir_prepopulate done\n");
1283         return err;
1284 }
1285
1286 int ceph_inode_set_size(struct inode *inode, loff_t size)
1287 {
1288         struct ceph_inode_info *ci = ceph_inode(inode);
1289         int ret = 0;
1290
1291         spin_lock(&inode->i_lock);
1292         dout("set_size %p %llu -> %llu\n", inode, inode->i_size, size);
1293         inode->i_size = size;
1294         inode->i_blocks = (size + (1 << 9) - 1) >> 9;
1295
1296         /* tell the MDS if we are approaching max_size */
1297         if ((size << 1) >= ci->i_max_size &&
1298             (ci->i_reported_size << 1) < ci->i_max_size)
1299                 ret = 1;
1300
1301         spin_unlock(&inode->i_lock);
1302         return ret;
1303 }
1304
1305 /*
1306  * Write back inode data in a worker thread.  (This can't be done
1307  * in the message handler context.)
1308  */
1309 void ceph_queue_writeback(struct inode *inode)
1310 {
1311         if (queue_work(ceph_inode_to_client(inode)->wb_wq,
1312                        &ceph_inode(inode)->i_wb_work)) {
1313                 dout("ceph_queue_writeback %p\n", inode);
1314                 igrab(inode);
1315         } else {
1316                 dout("ceph_queue_writeback %p failed\n", inode);
1317         }
1318 }
1319
1320 static void ceph_writeback_work(struct work_struct *work)
1321 {
1322         struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1323                                                   i_wb_work);
1324         struct inode *inode = &ci->vfs_inode;
1325
1326         dout("writeback %p\n", inode);
1327         filemap_fdatawrite(&inode->i_data);
1328         iput(inode);
1329 }
1330
1331 /*
1332  * queue an async invalidation
1333  */
1334 void ceph_queue_invalidate(struct inode *inode)
1335 {
1336         if (queue_work(ceph_inode_to_client(inode)->pg_inv_wq,
1337                        &ceph_inode(inode)->i_pg_inv_work)) {
1338                 dout("ceph_queue_invalidate %p\n", inode);
1339                 igrab(inode);
1340         } else {
1341                 dout("ceph_queue_invalidate %p failed\n", inode);
1342         }
1343 }
1344
1345 /*
1346  * invalidate any pages that are not dirty or under writeback.  this
1347  * includes pages that are clean and mapped.
1348  */
1349 static void ceph_invalidate_nondirty_pages(struct address_space *mapping)
1350 {
1351         struct pagevec pvec;
1352         pgoff_t next = 0;
1353         int i;
1354
1355         pagevec_init(&pvec, 0);
1356         while (pagevec_lookup(&pvec, mapping, next, PAGEVEC_SIZE)) {
1357                 for (i = 0; i < pagevec_count(&pvec); i++) {
1358                         struct page *page = pvec.pages[i];
1359                         pgoff_t index;
1360                         int skip_page =
1361                                 (PageDirty(page) || PageWriteback(page));
1362
1363                         if (!skip_page)
1364                                 skip_page = !trylock_page(page);
1365
1366                         /*
1367                          * We really shouldn't be looking at the ->index of an
1368                          * unlocked page.  But we're not allowed to lock these
1369                          * pages.  So we rely upon nobody altering the ->index
1370                          * of this (pinned-by-us) page.
1371                          */
1372                         index = page->index;
1373                         if (index > next)
1374                                 next = index;
1375                         next++;
1376
1377                         if (skip_page)
1378                                 continue;
1379
1380                         generic_error_remove_page(mapping, page);
1381                         unlock_page(page);
1382                 }
1383                 pagevec_release(&pvec);
1384                 cond_resched();
1385         }
1386 }
1387
1388 /*
1389  * Invalidate inode pages in a worker thread.  (This can't be done
1390  * in the message handler context.)
1391  */
1392 static void ceph_invalidate_work(struct work_struct *work)
1393 {
1394         struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1395                                                   i_pg_inv_work);
1396         struct inode *inode = &ci->vfs_inode;
1397         u32 orig_gen;
1398         int check = 0;
1399
1400         spin_lock(&inode->i_lock);
1401         dout("invalidate_pages %p gen %d revoking %d\n", inode,
1402              ci->i_rdcache_gen, ci->i_rdcache_revoking);
1403         if (ci->i_rdcache_revoking != ci->i_rdcache_gen) {
1404                 /* nevermind! */
1405                 spin_unlock(&inode->i_lock);
1406                 goto out;
1407         }
1408         orig_gen = ci->i_rdcache_gen;
1409         spin_unlock(&inode->i_lock);
1410
1411         ceph_invalidate_nondirty_pages(inode->i_mapping);
1412
1413         spin_lock(&inode->i_lock);
1414         if (orig_gen == ci->i_rdcache_gen &&
1415             orig_gen == ci->i_rdcache_revoking) {
1416                 dout("invalidate_pages %p gen %d successful\n", inode,
1417                      ci->i_rdcache_gen);
1418                 ci->i_rdcache_revoking--;
1419                 check = 1;
1420         } else {
1421                 dout("invalidate_pages %p gen %d raced, now %d revoking %d\n",
1422                      inode, orig_gen, ci->i_rdcache_gen,
1423                      ci->i_rdcache_revoking);
1424         }
1425         spin_unlock(&inode->i_lock);
1426
1427         if (check)
1428                 ceph_check_caps(ci, 0, NULL);
1429 out:
1430         iput(inode);
1431 }
1432
1433
1434 /*
1435  * called by trunc_wq; take i_mutex ourselves
1436  *
1437  * We also truncate in a separate thread as well.
1438  */
1439 static void ceph_vmtruncate_work(struct work_struct *work)
1440 {
1441         struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1442                                                   i_vmtruncate_work);
1443         struct inode *inode = &ci->vfs_inode;
1444
1445         dout("vmtruncate_work %p\n", inode);
1446         mutex_lock(&inode->i_mutex);
1447         __ceph_do_pending_vmtruncate(inode);
1448         mutex_unlock(&inode->i_mutex);
1449         iput(inode);
1450 }
1451
1452 /*
1453  * Queue an async vmtruncate.  If we fail to queue work, we will handle
1454  * the truncation the next time we call __ceph_do_pending_vmtruncate.
1455  */
1456 void ceph_queue_vmtruncate(struct inode *inode)
1457 {
1458         struct ceph_inode_info *ci = ceph_inode(inode);
1459
1460         if (queue_work(ceph_sb_to_client(inode->i_sb)->trunc_wq,
1461                        &ci->i_vmtruncate_work)) {
1462                 dout("ceph_queue_vmtruncate %p\n", inode);
1463                 igrab(inode);
1464         } else {
1465                 dout("ceph_queue_vmtruncate %p failed, pending=%d\n",
1466                      inode, ci->i_truncate_pending);
1467         }
1468 }
1469
1470 /*
1471  * called with i_mutex held.
1472  *
1473  * Make sure any pending truncation is applied before doing anything
1474  * that may depend on it.
1475  */
1476 void __ceph_do_pending_vmtruncate(struct inode *inode)
1477 {
1478         struct ceph_inode_info *ci = ceph_inode(inode);
1479         u64 to;
1480         int wrbuffer_refs, wake = 0;
1481
1482 retry:
1483         spin_lock(&inode->i_lock);
1484         if (ci->i_truncate_pending == 0) {
1485                 dout("__do_pending_vmtruncate %p none pending\n", inode);
1486                 spin_unlock(&inode->i_lock);
1487                 return;
1488         }
1489
1490         /*
1491          * make sure any dirty snapped pages are flushed before we
1492          * possibly truncate them.. so write AND block!
1493          */
1494         if (ci->i_wrbuffer_ref_head < ci->i_wrbuffer_ref) {
1495                 dout("__do_pending_vmtruncate %p flushing snaps first\n",
1496                      inode);
1497                 spin_unlock(&inode->i_lock);
1498                 filemap_write_and_wait_range(&inode->i_data, 0,
1499                                              inode->i_sb->s_maxbytes);
1500                 goto retry;
1501         }
1502
1503         to = ci->i_truncate_size;
1504         wrbuffer_refs = ci->i_wrbuffer_ref;
1505         dout("__do_pending_vmtruncate %p (%d) to %lld\n", inode,
1506              ci->i_truncate_pending, to);
1507         spin_unlock(&inode->i_lock);
1508
1509         truncate_inode_pages(inode->i_mapping, to);
1510
1511         spin_lock(&inode->i_lock);
1512         ci->i_truncate_pending--;
1513         if (ci->i_truncate_pending == 0)
1514                 wake = 1;
1515         spin_unlock(&inode->i_lock);
1516
1517         if (wrbuffer_refs == 0)
1518                 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
1519         if (wake)
1520                 wake_up_all(&ci->i_cap_wq);
1521 }
1522
1523
1524 /*
1525  * symlinks
1526  */
1527 static void *ceph_sym_follow_link(struct dentry *dentry, struct nameidata *nd)
1528 {
1529         struct ceph_inode_info *ci = ceph_inode(dentry->d_inode);
1530         nd_set_link(nd, ci->i_symlink);
1531         return NULL;
1532 }
1533
1534 static const struct inode_operations ceph_symlink_iops = {
1535         .readlink = generic_readlink,
1536         .follow_link = ceph_sym_follow_link,
1537 };
1538
1539 /*
1540  * setattr
1541  */
1542 int ceph_setattr(struct dentry *dentry, struct iattr *attr)
1543 {
1544         struct inode *inode = dentry->d_inode;
1545         struct ceph_inode_info *ci = ceph_inode(inode);
1546         struct inode *parent_inode = dentry->d_parent->d_inode;
1547         const unsigned int ia_valid = attr->ia_valid;
1548         struct ceph_mds_request *req;
1549         struct ceph_mds_client *mdsc = ceph_sb_to_client(dentry->d_sb)->mdsc;
1550         int issued;
1551         int release = 0, dirtied = 0;
1552         int mask = 0;
1553         int err = 0;
1554
1555         if (ceph_snap(inode) != CEPH_NOSNAP)
1556                 return -EROFS;
1557
1558         __ceph_do_pending_vmtruncate(inode);
1559
1560         err = inode_change_ok(inode, attr);
1561         if (err != 0)
1562                 return err;
1563
1564         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETATTR,
1565                                        USE_AUTH_MDS);
1566         if (IS_ERR(req))
1567                 return PTR_ERR(req);
1568
1569         spin_lock(&inode->i_lock);
1570         issued = __ceph_caps_issued(ci, NULL);
1571         dout("setattr %p issued %s\n", inode, ceph_cap_string(issued));
1572
1573         if (ia_valid & ATTR_UID) {
1574                 dout("setattr %p uid %d -> %d\n", inode,
1575                      inode->i_uid, attr->ia_uid);
1576                 if (issued & CEPH_CAP_AUTH_EXCL) {
1577                         inode->i_uid = attr->ia_uid;
1578                         dirtied |= CEPH_CAP_AUTH_EXCL;
1579                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1580                            attr->ia_uid != inode->i_uid) {
1581                         req->r_args.setattr.uid = cpu_to_le32(attr->ia_uid);
1582                         mask |= CEPH_SETATTR_UID;
1583                         release |= CEPH_CAP_AUTH_SHARED;
1584                 }
1585         }
1586         if (ia_valid & ATTR_GID) {
1587                 dout("setattr %p gid %d -> %d\n", inode,
1588                      inode->i_gid, attr->ia_gid);
1589                 if (issued & CEPH_CAP_AUTH_EXCL) {
1590                         inode->i_gid = attr->ia_gid;
1591                         dirtied |= CEPH_CAP_AUTH_EXCL;
1592                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1593                            attr->ia_gid != inode->i_gid) {
1594                         req->r_args.setattr.gid = cpu_to_le32(attr->ia_gid);
1595                         mask |= CEPH_SETATTR_GID;
1596                         release |= CEPH_CAP_AUTH_SHARED;
1597                 }
1598         }
1599         if (ia_valid & ATTR_MODE) {
1600                 dout("setattr %p mode 0%o -> 0%o\n", inode, inode->i_mode,
1601                      attr->ia_mode);
1602                 if (issued & CEPH_CAP_AUTH_EXCL) {
1603                         inode->i_mode = attr->ia_mode;
1604                         dirtied |= CEPH_CAP_AUTH_EXCL;
1605                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1606                            attr->ia_mode != inode->i_mode) {
1607                         req->r_args.setattr.mode = cpu_to_le32(attr->ia_mode);
1608                         mask |= CEPH_SETATTR_MODE;
1609                         release |= CEPH_CAP_AUTH_SHARED;
1610                 }
1611         }
1612
1613         if (ia_valid & ATTR_ATIME) {
1614                 dout("setattr %p atime %ld.%ld -> %ld.%ld\n", inode,
1615                      inode->i_atime.tv_sec, inode->i_atime.tv_nsec,
1616                      attr->ia_atime.tv_sec, attr->ia_atime.tv_nsec);
1617                 if (issued & CEPH_CAP_FILE_EXCL) {
1618                         ci->i_time_warp_seq++;
1619                         inode->i_atime = attr->ia_atime;
1620                         dirtied |= CEPH_CAP_FILE_EXCL;
1621                 } else if ((issued & CEPH_CAP_FILE_WR) &&
1622                            timespec_compare(&inode->i_atime,
1623                                             &attr->ia_atime) < 0) {
1624                         inode->i_atime = attr->ia_atime;
1625                         dirtied |= CEPH_CAP_FILE_WR;
1626                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1627                            !timespec_equal(&inode->i_atime, &attr->ia_atime)) {
1628                         ceph_encode_timespec(&req->r_args.setattr.atime,
1629                                              &attr->ia_atime);
1630                         mask |= CEPH_SETATTR_ATIME;
1631                         release |= CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_RD |
1632                                 CEPH_CAP_FILE_WR;
1633                 }
1634         }
1635         if (ia_valid & ATTR_MTIME) {
1636                 dout("setattr %p mtime %ld.%ld -> %ld.%ld\n", inode,
1637                      inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
1638                      attr->ia_mtime.tv_sec, attr->ia_mtime.tv_nsec);
1639                 if (issued & CEPH_CAP_FILE_EXCL) {
1640                         ci->i_time_warp_seq++;
1641                         inode->i_mtime = attr->ia_mtime;
1642                         dirtied |= CEPH_CAP_FILE_EXCL;
1643                 } else if ((issued & CEPH_CAP_FILE_WR) &&
1644                            timespec_compare(&inode->i_mtime,
1645                                             &attr->ia_mtime) < 0) {
1646                         inode->i_mtime = attr->ia_mtime;
1647                         dirtied |= CEPH_CAP_FILE_WR;
1648                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1649                            !timespec_equal(&inode->i_mtime, &attr->ia_mtime)) {
1650                         ceph_encode_timespec(&req->r_args.setattr.mtime,
1651                                              &attr->ia_mtime);
1652                         mask |= CEPH_SETATTR_MTIME;
1653                         release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD |
1654                                 CEPH_CAP_FILE_WR;
1655                 }
1656         }
1657         if (ia_valid & ATTR_SIZE) {
1658                 dout("setattr %p size %lld -> %lld\n", inode,
1659                      inode->i_size, attr->ia_size);
1660                 if (attr->ia_size > inode->i_sb->s_maxbytes) {
1661                         err = -EINVAL;
1662                         goto out;
1663                 }
1664                 if ((issued & CEPH_CAP_FILE_EXCL) &&
1665                     attr->ia_size > inode->i_size) {
1666                         inode->i_size = attr->ia_size;
1667                         inode->i_blocks =
1668                                 (attr->ia_size + (1 << 9) - 1) >> 9;
1669                         inode->i_ctime = attr->ia_ctime;
1670                         ci->i_reported_size = attr->ia_size;
1671                         dirtied |= CEPH_CAP_FILE_EXCL;
1672                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1673                            attr->ia_size != inode->i_size) {
1674                         req->r_args.setattr.size = cpu_to_le64(attr->ia_size);
1675                         req->r_args.setattr.old_size =
1676                                 cpu_to_le64(inode->i_size);
1677                         mask |= CEPH_SETATTR_SIZE;
1678                         release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD |
1679                                 CEPH_CAP_FILE_WR;
1680                 }
1681         }
1682
1683         /* these do nothing */
1684         if (ia_valid & ATTR_CTIME) {
1685                 bool only = (ia_valid & (ATTR_SIZE|ATTR_MTIME|ATTR_ATIME|
1686                                          ATTR_MODE|ATTR_UID|ATTR_GID)) == 0;
1687                 dout("setattr %p ctime %ld.%ld -> %ld.%ld (%s)\n", inode,
1688                      inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
1689                      attr->ia_ctime.tv_sec, attr->ia_ctime.tv_nsec,
1690                      only ? "ctime only" : "ignored");
1691                 inode->i_ctime = attr->ia_ctime;
1692                 if (only) {
1693                         /*
1694                          * if kernel wants to dirty ctime but nothing else,
1695                          * we need to choose a cap to dirty under, or do
1696                          * a almost-no-op setattr
1697                          */
1698                         if (issued & CEPH_CAP_AUTH_EXCL)
1699                                 dirtied |= CEPH_CAP_AUTH_EXCL;
1700                         else if (issued & CEPH_CAP_FILE_EXCL)
1701                                 dirtied |= CEPH_CAP_FILE_EXCL;
1702                         else if (issued & CEPH_CAP_XATTR_EXCL)
1703                                 dirtied |= CEPH_CAP_XATTR_EXCL;
1704                         else
1705                                 mask |= CEPH_SETATTR_CTIME;
1706                 }
1707         }
1708         if (ia_valid & ATTR_FILE)
1709                 dout("setattr %p ATTR_FILE ... hrm!\n", inode);
1710
1711         if (dirtied) {
1712                 __ceph_mark_dirty_caps(ci, dirtied);
1713                 inode->i_ctime = CURRENT_TIME;
1714         }
1715
1716         release &= issued;
1717         spin_unlock(&inode->i_lock);
1718
1719         if (mask) {
1720                 req->r_inode = igrab(inode);
1721                 req->r_inode_drop = release;
1722                 req->r_args.setattr.mask = cpu_to_le32(mask);
1723                 req->r_num_caps = 1;
1724                 err = ceph_mdsc_do_request(mdsc, parent_inode, req);
1725         }
1726         dout("setattr %p result=%d (%s locally, %d remote)\n", inode, err,
1727              ceph_cap_string(dirtied), mask);
1728
1729         ceph_mdsc_put_request(req);
1730         __ceph_do_pending_vmtruncate(inode);
1731         return err;
1732 out:
1733         spin_unlock(&inode->i_lock);
1734         ceph_mdsc_put_request(req);
1735         return err;
1736 }
1737
1738 /*
1739  * Verify that we have a lease on the given mask.  If not,
1740  * do a getattr against an mds.
1741  */
1742 int ceph_do_getattr(struct inode *inode, int mask)
1743 {
1744         struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
1745         struct ceph_mds_client *mdsc = fsc->mdsc;
1746         struct ceph_mds_request *req;
1747         int err;
1748
1749         if (ceph_snap(inode) == CEPH_SNAPDIR) {
1750                 dout("do_getattr inode %p SNAPDIR\n", inode);
1751                 return 0;
1752         }
1753
1754         dout("do_getattr inode %p mask %s mode 0%o\n", inode, ceph_cap_string(mask), inode->i_mode);
1755         if (ceph_caps_issued_mask(ceph_inode(inode), mask, 1))
1756                 return 0;
1757
1758         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
1759         if (IS_ERR(req))
1760                 return PTR_ERR(req);
1761         req->r_inode = igrab(inode);
1762         req->r_num_caps = 1;
1763         req->r_args.getattr.mask = cpu_to_le32(mask);
1764         err = ceph_mdsc_do_request(mdsc, NULL, req);
1765         ceph_mdsc_put_request(req);
1766         dout("do_getattr result=%d\n", err);
1767         return err;
1768 }
1769
1770
1771 /*
1772  * Check inode permissions.  We verify we have a valid value for
1773  * the AUTH cap, then call the generic handler.
1774  */
1775 int ceph_permission(struct inode *inode, int mask)
1776 {
1777         int err = ceph_do_getattr(inode, CEPH_CAP_AUTH_SHARED);
1778
1779         if (!err)
1780                 err = generic_permission(inode, mask, NULL);
1781         return err;
1782 }
1783
1784 /*
1785  * Get all attributes.  Hopefully somedata we'll have a statlite()
1786  * and can limit the fields we require to be accurate.
1787  */
1788 int ceph_getattr(struct vfsmount *mnt, struct dentry *dentry,
1789                  struct kstat *stat)
1790 {
1791         struct inode *inode = dentry->d_inode;
1792         struct ceph_inode_info *ci = ceph_inode(inode);
1793         int err;
1794
1795         err = ceph_do_getattr(inode, CEPH_STAT_CAP_INODE_ALL);
1796         if (!err) {
1797                 generic_fillattr(inode, stat);
1798                 stat->ino = inode->i_ino;
1799                 if (ceph_snap(inode) != CEPH_NOSNAP)
1800                         stat->dev = ceph_snap(inode);
1801                 else
1802                         stat->dev = 0;
1803                 if (S_ISDIR(inode->i_mode)) {
1804                         if (ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb),
1805                                                 RBYTES))
1806                                 stat->size = ci->i_rbytes;
1807                         else
1808                                 stat->size = ci->i_files + ci->i_subdirs;
1809                         stat->blocks = 0;
1810                         stat->blksize = 65536;
1811                 }
1812         }
1813         return err;
1814 }