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