fs/ceph/inode.c

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