SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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
  14 #include "super.h"
  15 #include "decode.h"
  16
  17 /*
  18  * Ceph inode operations
  19  *
  20  * Implement basic inode helpers (get, alloc) and inode ops (getattr,
  21  * setattr, etc.), xattr helpers, and helpers for assimilating
  22  * metadata returned by the MDS into our cache.
  23  *
  24  * Also define helpers for doing asynchronous writeback, invalidation,
  25  * and truncation for the benefit of those who can't afford to block
  26  * (typically because they are in the message handler path).
  27  */
  28
  29 static const struct inode_operations ceph_symlink_iops;
  30
  31 static void ceph_invalidate_work(struct work_struct *work);
  32 static void ceph_writeback_work(struct work_struct *work);
  33 static void ceph_vmtruncate_work(struct work_struct *work);
  34
  35 /*
  36  * find or create an inode, given the ceph ino number
  37  */
  38 struct inode *ceph_get_inode(struct super_block *sb, struct ceph_vino vino)
  39 {
  40         struct inode *inode;
  41         ino_t t = ceph_vino_to_ino(vino);
  42
  43         inode = iget5_locked(sb, t, ceph_ino_compare, ceph_set_ino_cb, &vino);
  44         if (inode == NULL)
  45                 return ERR_PTR(-ENOMEM);
  46         if (inode->i_state & I_NEW) {
  47                 dout("get_inode created new inode %p %llx.%llx ino %llx\n",
  48                      inode, ceph_vinop(inode), (u64)inode->i_ino);
  49                 unlock_new_inode(inode);
  50         }
  51
  52         dout("get_inode on %lu=%llx.%llx got %p\n", inode->i_ino, vino.ino,
  53              vino.snap, inode);
  54         return inode;
  55 }
  56
  57 /*
  58  * get/constuct snapdir inode for a given directory
  59  */
  60 struct inode *ceph_get_snapdir(struct inode *parent)
  61 {
  62         struct ceph_vino vino = {
  63                 .ino = ceph_ino(parent),
  64                 .snap = CEPH_SNAPDIR,
  65         };
  66         struct inode *inode = ceph_get_inode(parent->i_sb, vino);
  67         struct ceph_inode_info *ci = ceph_inode(inode);
  68
  69         BUG_ON(!S_ISDIR(parent->i_mode));
  70         if (IS_ERR(inode))
  71                 return ERR_PTR(PTR_ERR(inode));
  72         inode->i_mode = parent->i_mode;
  73         inode->i_uid = parent->i_uid;
  74         inode->i_gid = parent->i_gid;
  75         inode->i_op = &ceph_dir_iops;
  76         inode->i_fop = &ceph_dir_fops;
  77         ci->i_snap_caps = CEPH_CAP_PIN; /* so we can open */
  78         ci->i_rbytes = 0;
  79         return inode;
  80 }
  81
  82 const struct inode_operations ceph_file_iops = {
  83         .permission = ceph_permission,
  84         .setattr = ceph_setattr,
  85         .getattr = ceph_getattr,
  86         .setxattr = ceph_setxattr,
  87         .getxattr = ceph_getxattr,
  88         .listxattr = ceph_listxattr,
  89         .removexattr = ceph_removexattr,
  90 };
  91
  92
  93 /*
  94  * We use a 'frag tree' to keep track of the MDS's directory fragments
  95  * for a given inode (usually there is just a single fragment).  We
  96  * need to know when a child frag is delegated to a new MDS, or when
  97  * it is flagged as replicated, so we can direct our requests
  98  * accordingly.
  99  */
 100
 101 /*
 102  * find/create a frag in the tree
 103  */
 104 static struct ceph_inode_frag *__get_or_create_frag(struct ceph_inode_info *ci,
 105                                                     u32 f)
 106 {
 107         struct rb_node **p;
 108         struct rb_node *parent = NULL;
 109         struct ceph_inode_frag *frag;
 110         int c;
 111
 112         p = &ci->i_fragtree.rb_node;
 113         while (*p) {
 114                 parent = *p;
 115                 frag = rb_entry(parent, struct ceph_inode_frag, node);
 116                 c = ceph_frag_compare(f, frag->frag);
 117                 if (c < 0)
 118                         p = &(*p)->rb_left;
 119                 else if (c > 0)
 120                         p = &(*p)->rb_right;
 121                 else
 122                         return frag;
 123         }
 124
 125         frag = kmalloc(sizeof(*frag), GFP_NOFS);
 126         if (!frag) {
 127                 pr_err("__get_or_create_frag ENOMEM on %p %llx.%llx "
 128                        "frag %x\n", &ci->vfs_inode,
 129                        ceph_vinop(&ci->vfs_inode), f);
 130                 return ERR_PTR(-ENOMEM);
 131         }
 132         frag->frag = f;
 133         frag->split_by = 0;
 134         frag->mds = -1;
 135         frag->ndist = 0;
 136
 137         rb_link_node(&frag->node, parent, p);
 138         rb_insert_color(&frag->node, &ci->i_fragtree);
 139
 140         dout("get_or_create_frag added %llx.%llx frag %x\n",
 141              ceph_vinop(&ci->vfs_inode), f);
 142         return frag;
 143 }
 144
 145 /*
 146  * find a specific frag @f
 147  */
 148 struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci, u32 f)
 149 {
 150         struct rb_node *n = ci->i_fragtree.rb_node;
 151
 152         while (n) {
 153                 struct ceph_inode_frag *frag =
 154                         rb_entry(n, struct ceph_inode_frag, node);
 155                 int c = ceph_frag_compare(f, frag->frag);
 156                 if (c < 0)
 157                         n = n->rb_left;
 158                 else if (c > 0)
 159                         n = n->rb_right;
 160                 else
 161                         return frag;
 162         }
 163         return NULL;
 164 }
 165
 166 /*
 167  * Choose frag containing the given value @v.  If @pfrag is
 168  * specified, copy the frag delegation info to the caller if
 169  * it is present.
 170  */
 171 u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
 172                      struct ceph_inode_frag *pfrag,
 173                      int *found)
 174 {
 175         u32 t = ceph_frag_make(0, 0);
 176         struct ceph_inode_frag *frag;
 177         unsigned nway, i;
 178         u32 n;
 179
 180         if (found)
 181                 *found = 0;
 182
 183         mutex_lock(&ci->i_fragtree_mutex);
 184         while (1) {
 185                 WARN_ON(!ceph_frag_contains_value(t, v));
 186                 frag = __ceph_find_frag(ci, t);
 187                 if (!frag)
 188                         break; /* t is a leaf */
 189                 if (frag->split_by == 0) {
 190                         if (pfrag)
 191                                 memcpy(pfrag, frag, sizeof(*pfrag));
 192                         if (found)
 193                                 *found = 1;
 194                         break;
 195                 }
 196
 197                 /* choose child */
 198                 nway = 1 << frag->split_by;
 199                 dout("choose_frag(%x) %x splits by %d (%d ways)\n", v, t,
 200                      frag->split_by, nway);
 201                 for (i = 0; i < nway; i++) {
 202                         n = ceph_frag_make_child(t, frag->split_by, i);
 203                         if (ceph_frag_contains_value(n, v)) {
 204                                 t = n;
 205                                 break;
 206                         }
 207                 }
 208                 BUG_ON(i == nway);
 209         }
 210         dout("choose_frag(%x) = %x\n", v, t);
 211
 212         mutex_unlock(&ci->i_fragtree_mutex);
 213         return t;
 214 }
 215
 216 /*
 217  * Process dirfrag (delegation) info from the mds.  Include leaf
 218  * fragment in tree ONLY if ndist > 0.  Otherwise, only
 219  * branches/splits are included in i_fragtree)
 220  */
 221 static int ceph_fill_dirfrag(struct inode *inode,
 222                              struct ceph_mds_reply_dirfrag *dirinfo)
 223 {
 224         struct ceph_inode_info *ci = ceph_inode(inode);
 225         struct ceph_inode_frag *frag;
 226         u32 id = le32_to_cpu(dirinfo->frag);
 227         int mds = le32_to_cpu(dirinfo->auth);
 228         int ndist = le32_to_cpu(dirinfo->ndist);
 229         int i;
 230         int err = 0;
 231
 232         mutex_lock(&ci->i_fragtree_mutex);
 233         if (ndist == 0) {
 234                 /* no delegation info needed. */
 235                 frag = __ceph_find_frag(ci, id);
 236                 if (!frag)
 237                         goto out;
 238                 if (frag->split_by == 0) {
 239                         /* tree leaf, remove */
 240                         dout("fill_dirfrag removed %llx.%llx frag %x"
 241                              " (no ref)\n", ceph_vinop(inode), id);
 242                         rb_erase(&frag->node, &ci->i_fragtree);
 243                         kfree(frag);
 244                 } else {
 245                         /* tree branch, keep and clear */
 246                         dout("fill_dirfrag cleared %llx.%llx frag %x"
 247                              " referral\n", ceph_vinop(inode), id);
 248                         frag->mds = -1;
 249                         frag->ndist = 0;
 250                 }
 251                 goto out;
 252         }
 253
 254
 255         /* find/add this frag to store mds delegation info */
 256         frag = __get_or_create_frag(ci, id);
 257         if (IS_ERR(frag)) {
 258                 /* this is not the end of the world; we can continue
 259                    with bad/inaccurate delegation info */
 260                 pr_err("fill_dirfrag ENOMEM on mds ref %llx.%llx fg %x\n",
 261                        ceph_vinop(inode), le32_to_cpu(dirinfo->frag));
 262                 err = -ENOMEM;
 263                 goto out;
 264         }
 265
 266         frag->mds = mds;
 267         frag->ndist = min_t(u32, ndist, CEPH_MAX_DIRFRAG_REP);
 268         for (i = 0; i < frag->ndist; i++)
 269                 frag->dist[i] = le32_to_cpu(dirinfo->dist[i]);
 270         dout("fill_dirfrag %llx.%llx frag %x ndist=%d\n",
 271              ceph_vinop(inode), frag->frag, frag->ndist);
 272
 273 out:
 274         mutex_unlock(&ci->i_fragtree_mutex);
 275         return err;
 276 }
 277
 278
 279 /*
 280  * initialize a newly allocated inode.
 281  */
 282 struct inode *ceph_alloc_inode(struct super_block *sb)
 283 {
 284         struct ceph_inode_info *ci;
 285         int i;
 286
 287         ci = kmem_cache_alloc(ceph_inode_cachep, GFP_NOFS);
 288         if (!ci)
 289                 return NULL;
 290
 291         dout("alloc_inode %p\n", &ci->vfs_inode);
 292
 293         ci->i_version = 0;
 294         ci->i_time_warp_seq = 0;
 295         ci->i_ceph_flags = 0;
 296         ci->i_release_count = 0;
 297         ci->i_symlink = NULL;
 298
 299         ci->i_fragtree = RB_ROOT;
 300         mutex_init(&ci->i_fragtree_mutex);
 301
 302         ci->i_xattrs.blob = NULL;
 303         ci->i_xattrs.prealloc_blob = NULL;
 304         ci->i_xattrs.dirty = false;
 305         ci->i_xattrs.index = RB_ROOT;
 306         ci->i_xattrs.count = 0;
 307         ci->i_xattrs.names_size = 0;
 308         ci->i_xattrs.vals_size = 0;
 309         ci->i_xattrs.version = 0;
 310         ci->i_xattrs.index_version = 0;
 311
 312         ci->i_caps = RB_ROOT;
 313         ci->i_auth_cap = NULL;
 314         ci->i_dirty_caps = 0;
 315         ci->i_flushing_caps = 0;
 316         INIT_LIST_HEAD(&ci->i_dirty_item);
 317         INIT_LIST_HEAD(&ci->i_flushing_item);
 318         ci->i_cap_flush_seq = 0;
 319         ci->i_cap_flush_last_tid = 0;
 320         memset(&ci->i_cap_flush_tid, 0, sizeof(ci->i_cap_flush_tid));
 321         init_waitqueue_head(&ci->i_cap_wq);
 322         ci->i_hold_caps_min = 0;
 323         ci->i_hold_caps_max = 0;
 324         INIT_LIST_HEAD(&ci->i_cap_delay_list);
 325         ci->i_cap_exporting_mds = 0;
 326         ci->i_cap_exporting_mseq = 0;
 327         ci->i_cap_exporting_issued = 0;
 328         INIT_LIST_HEAD(&ci->i_cap_snaps);
 329         ci->i_head_snapc = NULL;
 330         ci->i_snap_caps = 0;
 331
 332         for (i = 0; i < CEPH_FILE_MODE_NUM; i++)
 333                 ci->i_nr_by_mode[i] = 0;
 334
 335         ci->i_truncate_seq = 0;
 336         ci->i_truncate_size = 0;
 337         ci->i_truncate_pending = 0;
 338
 339         ci->i_max_size = 0;
 340         ci->i_reported_size = 0;
 341         ci->i_wanted_max_size = 0;
 342         ci->i_requested_max_size = 0;
 343
 344         ci->i_pin_ref = 0;
 345         ci->i_rd_ref = 0;
 346         ci->i_rdcache_ref = 0;
 347         ci->i_wr_ref = 0;
 348         ci->i_wrbuffer_ref = 0;
 349         ci->i_wrbuffer_ref_head = 0;
 350         ci->i_shared_gen = 0;
 351         ci->i_rdcache_gen = 0;
 352         ci->i_rdcache_revoking = 0;
 353
 354         INIT_LIST_HEAD(&ci->i_unsafe_writes);
 355         INIT_LIST_HEAD(&ci->i_unsafe_dirops);
 356         spin_lock_init(&ci->i_unsafe_lock);
 357
 358         ci->i_snap_realm = NULL;
 359         INIT_LIST_HEAD(&ci->i_snap_realm_item);
 360         INIT_LIST_HEAD(&ci->i_snap_flush_item);
 361
 362         INIT_WORK(&ci->i_wb_work, ceph_writeback_work);
 363         INIT_WORK(&ci->i_pg_inv_work, ceph_invalidate_work);
 364
 365         INIT_WORK(&ci->i_vmtruncate_work, ceph_vmtruncate_work);
 366
 367         return &ci->vfs_inode;
 368 }
 369
 370 void ceph_destroy_inode(struct inode *inode)
 371 {
 372         struct ceph_inode_info *ci = ceph_inode(inode);
 373         struct ceph_inode_frag *frag;
 374         struct rb_node *n;
 375
 376         dout("destroy_inode %p ino %llx.%llx\n", inode, ceph_vinop(inode));
 377
 378         ceph_queue_caps_release(inode);
 379
 380         kfree(ci->i_symlink);
 381         while ((n = rb_first(&ci->i_fragtree)) != NULL) {
 382                 frag = rb_entry(n, struct ceph_inode_frag, node);
 383                 rb_erase(n, &ci->i_fragtree);
 384                 kfree(frag);
 385         }
 386
 387         __ceph_destroy_xattrs(ci);
 388         if (ci->i_xattrs.blob)
 389                 ceph_buffer_put(ci->i_xattrs.blob);
 390         if (ci->i_xattrs.prealloc_blob)
 391                 ceph_buffer_put(ci->i_xattrs.prealloc_blob);
 392
 393         kmem_cache_free(ceph_inode_cachep, ci);
 394 }
 395
 396
 397 /*
 398  * Helpers to fill in size, ctime, mtime, and atime.  We have to be
 399  * careful because either the client or MDS may have more up to date
 400  * info, depending on which capabilities are held, and whether
 401  * time_warp_seq or truncate_seq have increased.  (Ordinarily, mtime
 402  * and size are monotonically increasing, except when utimes() or
 403  * truncate() increments the corresponding _seq values.)
 404  */
 405 int ceph_fill_file_size(struct inode *inode, int issued,
 406                         u32 truncate_seq, u64 truncate_size, u64 size)
 407 {
 408         struct ceph_inode_info *ci = ceph_inode(inode);
 409         int queue_trunc = 0;
 410
 411         if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) > 0 ||
 412             (truncate_seq == ci->i_truncate_seq && size > inode->i_size)) {
 413                 dout("size %lld -> %llu\n", inode->i_size, size);
 414                 inode->i_size = size;
 415                 inode->i_blocks = (size + (1<<9) - 1) >> 9;
 416                 ci->i_reported_size = size;
 417                 if (truncate_seq != ci->i_truncate_seq) {
 418                         dout("truncate_seq %u -> %u\n",
 419                              ci->i_truncate_seq, truncate_seq);
 420                         ci->i_truncate_seq = truncate_seq;
 421                         /*
 422                          * If we hold relevant caps, or in the case where we're
 423                          * not the only client referencing this file and we
 424                          * don't hold those caps, then we need to check whether
 425                          * the file is either opened or mmaped
 426                          */
 427                         if ((issued & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_RD|
 428                                       CEPH_CAP_FILE_WR|CEPH_CAP_FILE_BUFFER|
 429                                       CEPH_CAP_FILE_EXCL)) ||
 430                             mapping_mapped(inode->i_mapping) ||
 431                             __ceph_caps_file_wanted(ci)) {
 432                                 ci->i_truncate_pending++;
 433                                 queue_trunc = 1;
 434                         }
 435                 }
 436         }
 437         if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) >= 0 &&
 438             ci->i_truncate_size != truncate_size) {
 439                 dout("truncate_size %lld -> %llu\n", ci->i_truncate_size,
 440                      truncate_size);
 441                 ci->i_truncate_size = truncate_size;
 442         }
 443         return queue_trunc;
 444 }
 445
 446 void ceph_fill_file_time(struct inode *inode, int issued,
 447                          u64 time_warp_seq, struct timespec *ctime,
 448                          struct timespec *mtime, struct timespec *atime)
 449 {
 450         struct ceph_inode_info *ci = ceph_inode(inode);
 451         int warn = 0;
 452
 453         if (issued & (CEPH_CAP_FILE_EXCL|
 454                       CEPH_CAP_FILE_WR|
 455                       CEPH_CAP_FILE_BUFFER)) {
 456                 if (timespec_compare(ctime, &inode->i_ctime) > 0) {
 457                         dout("ctime %ld.%09ld -> %ld.%09ld inc w/ cap\n",
 458                              inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
 459                              ctime->tv_sec, ctime->tv_nsec);
 460                         inode->i_ctime = *ctime;
 461                 }
 462                 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) > 0) {
 463                         /* the MDS did a utimes() */
 464                         dout("mtime %ld.%09ld -> %ld.%09ld "
 465                              "tw %d -> %d\n",
 466                              inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
 467                              mtime->tv_sec, mtime->tv_nsec,
 468                              ci->i_time_warp_seq, (int)time_warp_seq);
 469
 470                         inode->i_mtime = *mtime;
 471                         inode->i_atime = *atime;
 472                         ci->i_time_warp_seq = time_warp_seq;
 473                 } else if (time_warp_seq == ci->i_time_warp_seq) {
 474                         /* nobody did utimes(); take the max */
 475                         if (timespec_compare(mtime, &inode->i_mtime) > 0) {
 476                                 dout("mtime %ld.%09ld -> %ld.%09ld inc\n",
 477                                      inode->i_mtime.tv_sec,
 478                                      inode->i_mtime.tv_nsec,
 479                                      mtime->tv_sec, mtime->tv_nsec);
 480                                 inode->i_mtime = *mtime;
 481                         }
 482                         if (timespec_compare(atime, &inode->i_atime) > 0) {
 483                                 dout("atime %ld.%09ld -> %ld.%09ld inc\n",
 484                                      inode->i_atime.tv_sec,
 485                                      inode->i_atime.tv_nsec,
 486                                      atime->tv_sec, atime->tv_nsec);
 487                                 inode->i_atime = *atime;
 488                         }
 489                 } else if (issued & CEPH_CAP_FILE_EXCL) {
 490                         /* we did a utimes(); ignore mds values */
 491                 } else {
 492                         warn = 1;
 493                 }
 494         } else {
 495                 /* we have no write caps; whatever the MDS says is true */
 496                 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) >= 0) {
 497                         inode->i_ctime = *ctime;
 498                         inode->i_mtime = *mtime;
 499                         inode->i_atime = *atime;
 500                         ci->i_time_warp_seq = time_warp_seq;
 501                 } else {
 502                         warn = 1;
 503                 }
 504         }
 505         if (warn) /* time_warp_seq shouldn't go backwards */
 506                 dout("%p mds time_warp_seq %llu < %u\n",
 507                      inode, time_warp_seq, ci->i_time_warp_seq);
 508 }
 509
 510 /*
 511  * Populate an inode based on info from mds.  May be called on new or
 512  * existing inodes.
 513  */
 514 static int fill_inode(struct inode *inode,
 515                       struct ceph_mds_reply_info_in *iinfo,
 516                       struct ceph_mds_reply_dirfrag *dirinfo,
 517                       struct ceph_mds_session *session,
 518                       unsigned long ttl_from, int cap_fmode,
 519                       struct ceph_cap_reservation *caps_reservation)
 520 {
 521         struct ceph_mds_reply_inode *info = iinfo->in;
 522         struct ceph_inode_info *ci = ceph_inode(inode);
 523         int i;
 524         int issued, implemented;
 525         struct timespec mtime, atime, ctime;
 526         u32 nsplits;
 527         struct ceph_buffer *xattr_blob = NULL;
 528         int err = 0;
 529         int queue_trunc = 0;
 530
 531         dout("fill_inode %p ino %llx.%llx v %llu had %llu\n",
 532              inode, ceph_vinop(inode), le64_to_cpu(info->version),
 533              ci->i_version);
 534
 535         /*
 536          * prealloc xattr data, if it looks like we'll need it.  only
 537          * if len > 4 (meaning there are actually xattrs; the first 4
 538          * bytes are the xattr count).
 539          */
 540         if (iinfo->xattr_len > 4) {
 541                 xattr_blob = ceph_buffer_new(iinfo->xattr_len, GFP_NOFS);
 542                 if (!xattr_blob)
 543                         pr_err("fill_inode ENOMEM xattr blob %d bytes\n",
 544                                iinfo->xattr_len);
 545         }
 546
 547         spin_lock(&inode->i_lock);
 548
 549         /*
 550          * provided version will be odd if inode value is projected,
 551          * even if stable.  skip the update if we have a newer info
 552          * (e.g., due to inode info racing form multiple MDSs), or if
 553          * we are getting projected (unstable) inode info.
 554          */
 555         if (le64_to_cpu(info->version) > 0 &&
 556             (ci->i_version & ~1) > le64_to_cpu(info->version))
 557                 goto no_change;
 558
 559         issued = __ceph_caps_issued(ci, &implemented);
 560         issued |= implemented | __ceph_caps_dirty(ci);
 561
 562         /* update inode */
 563         ci->i_version = le64_to_cpu(info->version);
 564         inode->i_version++;
 565         inode->i_rdev = le32_to_cpu(info->rdev);
 566
 567         if ((issued & CEPH_CAP_AUTH_EXCL) == 0) {
 568                 inode->i_mode = le32_to_cpu(info->mode);
 569                 inode->i_uid = le32_to_cpu(info->uid);
 570                 inode->i_gid = le32_to_cpu(info->gid);
 571                 dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode,
 572                      inode->i_uid, inode->i_gid);
 573         }
 574
 575         if ((issued & CEPH_CAP_LINK_EXCL) == 0)
 576                 inode->i_nlink = le32_to_cpu(info->nlink);
 577
 578         /* be careful with mtime, atime, size */
 579         ceph_decode_timespec(&atime, &info->atime);
 580         ceph_decode_timespec(&mtime, &info->mtime);
 581         ceph_decode_timespec(&ctime, &info->ctime);
 582         queue_trunc = ceph_fill_file_size(inode, issued,
 583                                           le32_to_cpu(info->truncate_seq),
 584                                           le64_to_cpu(info->truncate_size),
 585                                           le64_to_cpu(info->size));
 586         ceph_fill_file_time(inode, issued,
 587                             le32_to_cpu(info->time_warp_seq),
 588                             &ctime, &mtime, &atime);
 589
 590         ci->i_max_size = le64_to_cpu(info->max_size);
 591         ci->i_layout = info->layout;
 592         inode->i_blkbits = fls(le32_to_cpu(info->layout.fl_stripe_unit)) - 1;
 593
 594         /* xattrs */
 595         /* note that if i_xattrs.len <= 4, i_xattrs.data will still be NULL. */
 596         if ((issued & CEPH_CAP_XATTR_EXCL) == 0 &&
 597             le64_to_cpu(info->xattr_version) > ci->i_xattrs.version) {
 598                 if (ci->i_xattrs.blob)
 599                         ceph_buffer_put(ci->i_xattrs.blob);
 600                 ci->i_xattrs.blob = xattr_blob;
 601                 if (xattr_blob)
 602                         memcpy(ci->i_xattrs.blob->vec.iov_base,
 603                                iinfo->xattr_data, iinfo->xattr_len);
 604                 ci->i_xattrs.version = le64_to_cpu(info->xattr_version);
 605         }
 606
 607         inode->i_mapping->a_ops = &ceph_aops;
 608         inode->i_mapping->backing_dev_info =
 609                 &ceph_client(inode->i_sb)->backing_dev_info;
 610
 611         switch (inode->i_mode & S_IFMT) {
 612         case S_IFIFO:
 613         case S_IFBLK:
 614         case S_IFCHR:
 615         case S_IFSOCK:
 616                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
 617                 inode->i_op = &ceph_file_iops;
 618                 break;
 619         case S_IFREG:
 620                 inode->i_op = &ceph_file_iops;
 621                 inode->i_fop = &ceph_file_fops;
 622                 break;
 623         case S_IFLNK:
 624                 inode->i_op = &ceph_symlink_iops;
 625                 if (!ci->i_symlink) {
 626                         int symlen = iinfo->symlink_len;
 627                         char *sym;
 628
 629                         BUG_ON(symlen != inode->i_size);
 630                         spin_unlock(&inode->i_lock);
 631
 632                         err = -ENOMEM;
 633                         sym = kmalloc(symlen+1, GFP_NOFS);
 634                         if (!sym)
 635                                 goto out;
 636                         memcpy(sym, iinfo->symlink, symlen);
 637                         sym[symlen] = 0;
 638
 639                         spin_lock(&inode->i_lock);
 640                         if (!ci->i_symlink)
 641                                 ci->i_symlink = sym;
 642                         else
 643                                 kfree(sym); /* lost a race */
 644                 }
 645                 break;
 646         case S_IFDIR:
 647                 inode->i_op = &ceph_dir_iops;
 648                 inode->i_fop = &ceph_dir_fops;
 649
 650                 ci->i_files = le64_to_cpu(info->files);
 651                 ci->i_subdirs = le64_to_cpu(info->subdirs);
 652                 ci->i_rbytes = le64_to_cpu(info->rbytes);
 653                 ci->i_rfiles = le64_to_cpu(info->rfiles);
 654                 ci->i_rsubdirs = le64_to_cpu(info->rsubdirs);
 655                 ceph_decode_timespec(&ci->i_rctime, &info->rctime);
 656
 657                 /* set dir completion flag? */
 658                 if (ci->i_files == 0 && ci->i_subdirs == 0 &&
 659                     ceph_snap(inode) == CEPH_NOSNAP &&
 660                     (le32_to_cpu(info->cap.caps) & CEPH_CAP_FILE_SHARED)) {
 661                         dout(" marking %p complete (empty)\n", inode);
 662                         ci->i_ceph_flags |= CEPH_I_COMPLETE;
 663                         ci->i_max_offset = 2;
 664                 }
 665
 666                 /* it may be better to set st_size in getattr instead? */
 667                 if (ceph_test_opt(ceph_client(inode->i_sb), RBYTES))
 668                         inode->i_size = ci->i_rbytes;
 669                 break;
 670         default:
 671                 pr_err("fill_inode %llx.%llx BAD mode 0%o\n",
 672                        ceph_vinop(inode), inode->i_mode);
 673         }
 674
 675 no_change:
 676         spin_unlock(&inode->i_lock);
 677
 678         /* queue truncate if we saw i_size decrease */
 679         if (queue_trunc)
 680                 ceph_queue_vmtruncate(inode);
 681
 682         /* populate frag tree */
 683         /* FIXME: move me up, if/when version reflects fragtree changes */
 684         nsplits = le32_to_cpu(info->fragtree.nsplits);
 685         mutex_lock(&ci->i_fragtree_mutex);
 686         for (i = 0; i < nsplits; i++) {
 687                 u32 id = le32_to_cpu(info->fragtree.splits[i].frag);
 688                 struct ceph_inode_frag *frag = __get_or_create_frag(ci, id);
 689
 690                 if (IS_ERR(frag))
 691                         continue;
 692                 frag->split_by = le32_to_cpu(info->fragtree.splits[i].by);
 693                 dout(" frag %x split by %d\n", frag->frag, frag->split_by);
 694         }
 695         mutex_unlock(&ci->i_fragtree_mutex);
 696
 697         /* were we issued a capability? */
 698         if (info->cap.caps) {
 699                 if (ceph_snap(inode) == CEPH_NOSNAP) {
 700                         ceph_add_cap(inode, session,
 701                                      le64_to_cpu(info->cap.cap_id),
 702                                      cap_fmode,
 703                                      le32_to_cpu(info->cap.caps),
 704                                      le32_to_cpu(info->cap.wanted),
 705                                      le32_to_cpu(info->cap.seq),
 706                                      le32_to_cpu(info->cap.mseq),
 707                                      le64_to_cpu(info->cap.realm),
 708                                      info->cap.flags,
 709                                      caps_reservation);
 710                 } else {
 711                         spin_lock(&inode->i_lock);
 712                         dout(" %p got snap_caps %s\n", inode,
 713                              ceph_cap_string(le32_to_cpu(info->cap.caps)));
 714                         ci->i_snap_caps |= le32_to_cpu(info->cap.caps);
 715                         if (cap_fmode >= 0)
 716                                 __ceph_get_fmode(ci, cap_fmode);
 717                         spin_unlock(&inode->i_lock);
 718                 }
 719         }
 720
 721         /* update delegation info? */
 722         if (dirinfo)
 723                 ceph_fill_dirfrag(inode, dirinfo);
 724
 725         err = 0;
 726
 727 out:
 728         if (xattr_blob)
 729                 ceph_buffer_put(xattr_blob);
 730         return err;
 731 }
 732
 733 /*
 734  * caller should hold session s_mutex.
 735  */
 736 static void update_dentry_lease(struct dentry *dentry,
 737                                 struct ceph_mds_reply_lease *lease,
 738                                 struct ceph_mds_session *session,
 739                                 unsigned long from_time)
 740 {
 741         struct ceph_dentry_info *di = ceph_dentry(dentry);
 742         long unsigned duration = le32_to_cpu(lease->duration_ms);
 743         long unsigned ttl = from_time + (duration * HZ) / 1000;
 744         long unsigned half_ttl = from_time + (duration * HZ / 2) / 1000;
 745         struct inode *dir;
 746
 747         /* only track leases on regular dentries */
 748         if (dentry->d_op != &ceph_dentry_ops)
 749                 return;
 750
 751         spin_lock(&dentry->d_lock);
 752         dout("update_dentry_lease %p mask %d duration %lu ms ttl %lu\n",
 753              dentry, le16_to_cpu(lease->mask), duration, ttl);
 754
 755         /* make lease_rdcache_gen match directory */
 756         dir = dentry->d_parent->d_inode;
 757         di->lease_shared_gen = ceph_inode(dir)->i_shared_gen;
 758
 759         if (lease->mask == 0)
 760                 goto out_unlock;
 761
 762         if (di->lease_gen == session->s_cap_gen &&
 763             time_before(ttl, dentry->d_time))
 764                 goto out_unlock;  /* we already have a newer lease. */
 765
 766         if (di->lease_session && di->lease_session != session)
 767                 goto out_unlock;
 768
 769         ceph_dentry_lru_touch(dentry);
 770
 771         if (!di->lease_session)
 772                 di->lease_session = ceph_get_mds_session(session);
 773         di->lease_gen = session->s_cap_gen;
 774         di->lease_seq = le32_to_cpu(lease->seq);
 775         di->lease_renew_after = half_ttl;
 776         di->lease_renew_from = 0;
 777         dentry->d_time = ttl;
 778 out_unlock:
 779         spin_unlock(&dentry->d_lock);
 780         return;
 781 }
 782
 783 /*
 784  * splice a dentry to an inode.
 785  * caller must hold directory i_mutex for this to be safe.
 786  *
 787  * we will only rehash the resulting dentry if @prehash is
 788  * true; @prehash will be set to false (for the benefit of
 789  * the caller) if we fail.
 790  */
 791 static struct dentry *splice_dentry(struct dentry *dn, struct inode *in,
 792                                     bool *prehash)
 793 {
 794         struct dentry *realdn;
 795
 796         /* dn must be unhashed */
 797         if (!d_unhashed(dn))
 798                 d_drop(dn);
 799         realdn = d_materialise_unique(dn, in);
 800         if (IS_ERR(realdn)) {
 801                 pr_err("splice_dentry error %p inode %p ino %llx.%llx\n",
 802                        dn, in, ceph_vinop(in));
 803                 if (prehash)
 804                         *prehash = false; /* don't rehash on error */
 805                 dn = realdn; /* note realdn contains the error */
 806                 goto out;
 807         } else if (realdn) {
 808                 dout("dn %p (%d) spliced with %p (%d) "
 809                      "inode %p ino %llx.%llx\n",
 810                      dn, atomic_read(&dn->d_count),
 811                      realdn, atomic_read(&realdn->d_count),
 812                      realdn->d_inode, ceph_vinop(realdn->d_inode));
 813                 dput(dn);
 814                 dn = realdn;
 815         } else {
 816                 BUG_ON(!ceph_dentry(dn));
 817
 818                 dout("dn %p attached to %p ino %llx.%llx\n",
 819                      dn, dn->d_inode, ceph_vinop(dn->d_inode));
 820         }
 821         if ((!prehash || *prehash) && d_unhashed(dn))
 822                 d_rehash(dn);
 823 out:
 824         return dn;
 825 }
 826
 827 /*
 828  * Set dentry's directory position based on the current dir's max, and
 829  * order it in d_subdirs, so that dcache_readdir behaves.
 830  */
 831 static void ceph_set_dentry_offset(struct dentry *dn)
 832 {
 833         struct dentry *dir = dn->d_parent;
 834         struct inode *inode = dn->d_parent->d_inode;
 835         struct ceph_dentry_info *di;
 836
 837         BUG_ON(!inode);
 838
 839         di = ceph_dentry(dn);
 840
 841         spin_lock(&inode->i_lock);
 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_tail(&dir->d_subdirs, &dn->d_u.d_child);
 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  * Incorporate results into the local cache.  This is either just
 856  * one inode, or a directory, dentry, and possibly linked-to inode (e.g.,
 857  * after a lookup).
 858  *
 859  * A reply may contain
 860  *         a directory inode along with a dentry.
 861  *  and/or a target inode
 862  *
 863  * Called with snap_rwsem (read).
 864  */
 865 int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req,
 866                     struct ceph_mds_session *session)
 867 {
 868         struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
 869         struct inode *in = NULL;
 870         struct ceph_mds_reply_inode *ininfo;
 871         struct ceph_vino vino;
 872         int i = 0;
 873         int err = 0;
 874
 875         dout("fill_trace %p is_dentry %d is_target %d\n", req,
 876              rinfo->head->is_dentry, rinfo->head->is_target);
 877
 878 #if 0
 879         /*
 880          * Debugging hook:
 881          *
 882          * If we resend completed ops to a recovering mds, we get no
 883          * trace.  Since that is very rare, pretend this is the case
 884          * to ensure the 'no trace' handlers in the callers behave.
 885          *
 886          * Fill in inodes unconditionally to avoid breaking cap
 887          * invariants.
 888          */
 889         if (rinfo->head->op & CEPH_MDS_OP_WRITE) {
 890                 pr_info("fill_trace faking empty trace on %lld %s\n",
 891                         req->r_tid, ceph_mds_op_name(rinfo->head->op));
 892                 if (rinfo->head->is_dentry) {
 893                         rinfo->head->is_dentry = 0;
 894                         err = fill_inode(req->r_locked_dir,
 895                                          &rinfo->diri, rinfo->dirfrag,
 896                                          session, req->r_request_started, -1);
 897                 }
 898                 if (rinfo->head->is_target) {
 899                         rinfo->head->is_target = 0;
 900                         ininfo = rinfo->targeti.in;
 901                         vino.ino = le64_to_cpu(ininfo->ino);
 902                         vino.snap = le64_to_cpu(ininfo->snapid);
 903                         in = ceph_get_inode(sb, vino);
 904                         err = fill_inode(in, &rinfo->targeti, NULL,
 905                                          session, req->r_request_started,
 906                                          req->r_fmode);
 907                         iput(in);
 908                 }
 909         }
 910 #endif
 911
 912         if (!rinfo->head->is_target && !rinfo->head->is_dentry) {
 913                 dout("fill_trace reply is empty!\n");
 914                 if (rinfo->head->result == 0 && req->r_locked_dir) {
 915                         struct ceph_inode_info *ci =
 916                                 ceph_inode(req->r_locked_dir);
 917                         dout(" clearing %p complete (empty trace)\n",
 918                              req->r_locked_dir);
 919                         ci->i_ceph_flags &= ~CEPH_I_COMPLETE;
 920                         ci->i_release_count++;
 921                 }
 922                 return 0;
 923         }
 924
 925         if (rinfo->head->is_dentry) {
 926                 struct inode *dir = req->r_locked_dir;
 927
 928                 err = fill_inode(dir, &rinfo->diri, rinfo->dirfrag,
 929                                  session, req->r_request_started, -1,
 930                                  &req->r_caps_reservation);
 931                 if (err < 0)
 932                         return err;
 933         }
 934
 935         if (rinfo->head->is_dentry && !req->r_aborted) {
 936                 /*
 937                  * lookup link rename   : null -> possibly existing inode
 938                  * mknod symlink mkdir  : null -> new inode
 939                  * unlink               : linked -> null
 940                  */
 941                 struct inode *dir = req->r_locked_dir;
 942                 struct dentry *dn = req->r_dentry;
 943                 bool have_dir_cap, have_lease;
 944
 945                 BUG_ON(!dn);
 946                 BUG_ON(!dir);
 947                 BUG_ON(dn->d_parent->d_inode != dir);
 948                 BUG_ON(ceph_ino(dir) !=
 949                        le64_to_cpu(rinfo->diri.in->ino));
 950                 BUG_ON(ceph_snap(dir) !=
 951                        le64_to_cpu(rinfo->diri.in->snapid));
 952
 953                 /* do we have a lease on the whole dir? */
 954                 have_dir_cap =
 955                         (le32_to_cpu(rinfo->diri.in->cap.caps) &
 956                          CEPH_CAP_FILE_SHARED);
 957
 958                 /* do we have a dn lease? */
 959                 have_lease = have_dir_cap ||
 960                         (le16_to_cpu(rinfo->dlease->mask) &
 961                          CEPH_LOCK_DN);
 962
 963                 if (!have_lease)
 964                         dout("fill_trace  no dentry lease or dir cap\n");
 965
 966                 /* rename? */
 967                 if (req->r_old_dentry && req->r_op == CEPH_MDS_OP_RENAME) {
 968                         dout(" src %p '%.*s' dst %p '%.*s'\n",
 969                              req->r_old_dentry,
 970                              req->r_old_dentry->d_name.len,
 971                              req->r_old_dentry->d_name.name,
 972                              dn, dn->d_name.len, dn->d_name.name);
 973                         dout("fill_trace doing d_move %p -> %p\n",
 974                              req->r_old_dentry, dn);
 975                         d_move(req->r_old_dentry, dn);
 976                         dout(" src %p '%.*s' dst %p '%.*s'\n",
 977                              req->r_old_dentry,
 978                              req->r_old_dentry->d_name.len,
 979                              req->r_old_dentry->d_name.name,
 980                              dn, dn->d_name.len, dn->d_name.name);
 981                         /* ensure target dentry is invalidated, despite
 982                            rehashing bug in vfs_rename_dir */
 983                         dn->d_time = jiffies;
 984                         ceph_dentry(dn)->lease_shared_gen = 0;
 985                         /* take overwritten dentry's readdir offset */
 986                         ceph_dentry(req->r_old_dentry)->offset =
 987                                 ceph_dentry(dn)->offset;
 988                         dn = req->r_old_dentry;  /* use old_dentry */
 989                         in = dn->d_inode;
 990                 }
 991
 992                 /* null dentry? */
 993                 if (!rinfo->head->is_target) {
 994                         dout("fill_trace null dentry\n");
 995                         if (dn->d_inode) {
 996                                 dout("d_delete %p\n", dn);
 997                                 d_delete(dn);
 998                         } else {
 999                                 dout("d_instantiate %p NULL\n", dn);
1000                                 d_instantiate(dn, NULL);
1001                                 if (have_lease && d_unhashed(dn))
1002                                         d_rehash(dn);
1003                                 update_dentry_lease(dn, rinfo->dlease,
1004                                                     session,
1005                                                     req->r_request_started);
1006                         }
1007                         goto done;
1008                 }
1009
1010                 /* attach proper inode */
1011                 ininfo = rinfo->targeti.in;
1012                 vino.ino = le64_to_cpu(ininfo->ino);
1013                 vino.snap = le64_to_cpu(ininfo->snapid);
1014                 if (!dn->d_inode) {
1015                         in = ceph_get_inode(sb, vino);
1016                         if (IS_ERR(in)) {
1017                                 pr_err("fill_trace bad get_inode "
1018                                        "%llx.%llx\n", vino.ino, vino.snap);
1019                                 err = PTR_ERR(in);
1020                                 d_delete(dn);
1021                                 goto done;
1022                         }
1023                         dn = splice_dentry(dn, in, &have_lease);
1024                         if (IS_ERR(dn)) {
1025                                 err = PTR_ERR(dn);
1026                                 goto done;
1027                         }
1028                         req->r_dentry = dn;  /* may have spliced */
1029                         ceph_set_dentry_offset(dn);
1030                         igrab(in);
1031                 } else if (ceph_ino(in) == vino.ino &&
1032                            ceph_snap(in) == vino.snap) {
1033                         igrab(in);
1034                 } else {
1035                         dout(" %p links to %p %llx.%llx, not %llx.%llx\n",
1036                              dn, in, ceph_ino(in), ceph_snap(in),
1037                              vino.ino, vino.snap);
1038                         have_lease = false;
1039                         in = NULL;
1040                 }
1041
1042                 if (have_lease)
1043                         update_dentry_lease(dn, rinfo->dlease, session,
1044                                             req->r_request_started);
1045                 dout(" final dn %p\n", dn);
1046                 i++;
1047         } else if (req->r_op == CEPH_MDS_OP_LOOKUPSNAP ||
1048                    req->r_op == CEPH_MDS_OP_MKSNAP) {
1049                 struct dentry *dn = req->r_dentry;
1050
1051                 /* fill out a snapdir LOOKUPSNAP dentry */
1052                 BUG_ON(!dn);
1053                 BUG_ON(!req->r_locked_dir);
1054                 BUG_ON(ceph_snap(req->r_locked_dir) != CEPH_SNAPDIR);
1055                 ininfo = rinfo->targeti.in;
1056                 vino.ino = le64_to_cpu(ininfo->ino);
1057                 vino.snap = le64_to_cpu(ininfo->snapid);
1058                 in = ceph_get_inode(sb, vino);
1059                 if (IS_ERR(in)) {
1060                         pr_err("fill_inode get_inode badness %llx.%llx\n",
1061                                vino.ino, vino.snap);
1062                         err = PTR_ERR(in);
1063                         d_delete(dn);
1064                         goto done;
1065                 }
1066                 dout(" linking snapped dir %p to dn %p\n", in, dn);
1067                 dn = splice_dentry(dn, in, NULL);
1068                 if (IS_ERR(dn)) {
1069                         err = PTR_ERR(dn);
1070                         goto done;
1071                 }
1072                 ceph_set_dentry_offset(dn);
1073                 req->r_dentry = dn;  /* may have spliced */
1074                 igrab(in);
1075                 rinfo->head->is_dentry = 1;  /* fool notrace handlers */
1076         }
1077
1078         if (rinfo->head->is_target) {
1079                 vino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1080                 vino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1081
1082                 if (in == NULL || ceph_ino(in) != vino.ino ||
1083                     ceph_snap(in) != vino.snap) {
1084                         in = ceph_get_inode(sb, vino);
1085                         if (IS_ERR(in)) {
1086                                 err = PTR_ERR(in);
1087                                 goto done;
1088                         }
1089                 }
1090                 req->r_target_inode = in;
1091
1092                 err = fill_inode(in,
1093                                  &rinfo->targeti, NULL,
1094                                  session, req->r_request_started,
1095                                  (le32_to_cpu(rinfo->head->result) == 0) ?
1096                                  req->r_fmode : -1,
1097                                  &req->r_caps_reservation);
1098                 if (err < 0) {
1099                         pr_err("fill_inode badness %p %llx.%llx\n",
1100                                in, ceph_vinop(in));
1101                         goto done;
1102                 }
1103         }
1104
1105 done:
1106         dout("fill_trace done err=%d\n", err);
1107         return err;
1108 }
1109
1110 /*
1111  * Prepopulate our cache with readdir results, leases, etc.
1112  */
1113 int ceph_readdir_prepopulate(struct ceph_mds_request *req,
1114                              struct ceph_mds_session *session)
1115 {
1116         struct dentry *parent = req->r_dentry;
1117         struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1118         struct qstr dname;
1119         struct dentry *dn;
1120         struct inode *in;
1121         int err = 0, i;
1122         struct inode *snapdir = NULL;
1123         struct ceph_mds_request_head *rhead = req->r_request->front.iov_base;
1124         u64 frag = le32_to_cpu(rhead->args.readdir.frag);
1125         struct ceph_dentry_info *di;
1126
1127         if (le32_to_cpu(rinfo->head->op) == CEPH_MDS_OP_LSSNAP) {
1128                 snapdir = ceph_get_snapdir(parent->d_inode);
1129                 parent = d_find_alias(snapdir);
1130                 dout("readdir_prepopulate %d items under SNAPDIR dn %p\n",
1131                      rinfo->dir_nr, parent);
1132         } else {
1133                 dout("readdir_prepopulate %d items under dn %p\n",
1134                      rinfo->dir_nr, parent);
1135                 if (rinfo->dir_dir)
1136                         ceph_fill_dirfrag(parent->d_inode, rinfo->dir_dir);
1137         }
1138
1139         for (i = 0; i < rinfo->dir_nr; i++) {
1140                 struct ceph_vino vino;
1141
1142                 dname.name = rinfo->dir_dname[i];
1143                 dname.len = rinfo->dir_dname_len[i];
1144                 dname.hash = full_name_hash(dname.name, dname.len);
1145
1146                 vino.ino = le64_to_cpu(rinfo->dir_in[i].in->ino);
1147                 vino.snap = le64_to_cpu(rinfo->dir_in[i].in->snapid);
1148
1149 retry_lookup:
1150                 dn = d_lookup(parent, &dname);
1151                 dout("d_lookup on parent=%p name=%.*s got %p\n",
1152                      parent, dname.len, dname.name, dn);
1153
1154                 if (!dn) {
1155                         dn = d_alloc(parent, &dname);
1156                         dout("d_alloc %p '%.*s' = %p\n", parent,
1157                              dname.len, dname.name, dn);
1158                         if (dn == NULL) {
1159                                 dout("d_alloc badness\n");
1160                                 err = -ENOMEM;
1161                                 goto out;
1162                         }
1163                         err = ceph_init_dentry(dn);
1164                         if (err < 0)
1165                                 goto out;
1166                 } else if (dn->d_inode &&
1167                            (ceph_ino(dn->d_inode) != vino.ino ||
1168                             ceph_snap(dn->d_inode) != vino.snap)) {
1169                         dout(" dn %p points to wrong inode %p\n",
1170                              dn, dn->d_inode);
1171                         d_delete(dn);
1172                         dput(dn);
1173                         goto retry_lookup;
1174                 } else {
1175                         /* reorder parent's d_subdirs */
1176                         spin_lock(&dcache_lock);
1177                         spin_lock(&dn->d_lock);
1178                         list_move(&dn->d_u.d_child, &parent->d_subdirs);
1179                         spin_unlock(&dn->d_lock);
1180                         spin_unlock(&dcache_lock);
1181                 }
1182
1183                 di = dn->d_fsdata;
1184                 di->offset = ceph_make_fpos(frag, i + req->r_readdir_offset);
1185
1186                 /* inode */
1187                 if (dn->d_inode) {
1188                         in = dn->d_inode;
1189                 } else {
1190                         in = ceph_get_inode(parent->d_sb, vino);
1191                         if (in == NULL) {
1192                                 dout("new_inode badness\n");
1193                                 d_delete(dn);
1194                                 dput(dn);
1195                                 err = -ENOMEM;
1196                                 goto out;
1197                         }
1198                         dn = splice_dentry(dn, in, NULL);
1199                 }
1200
1201                 if (fill_inode(in, &rinfo->dir_in[i], NULL, session,
1202                                req->r_request_started, -1,
1203                                &req->r_caps_reservation) < 0) {
1204                         pr_err("fill_inode badness on %p\n", in);
1205                         dput(dn);
1206                         continue;
1207                 }
1208                 update_dentry_lease(dn, rinfo->dir_dlease[i],
1209                                     req->r_session, req->r_request_started);
1210                 dput(dn);
1211         }
1212         req->r_did_prepopulate = true;
1213
1214 out:
1215         if (snapdir) {
1216                 iput(snapdir);
1217                 dput(parent);
1218         }
1219         dout("readdir_prepopulate done\n");
1220         return err;
1221 }
1222
1223 int ceph_inode_set_size(struct inode *inode, loff_t size)
1224 {
1225         struct ceph_inode_info *ci = ceph_inode(inode);
1226         int ret = 0;
1227
1228         spin_lock(&inode->i_lock);
1229         dout("set_size %p %llu -> %llu\n", inode, inode->i_size, size);
1230         inode->i_size = size;
1231         inode->i_blocks = (size + (1 << 9) - 1) >> 9;
1232
1233         /* tell the MDS if we are approaching max_size */
1234         if ((size << 1) >= ci->i_max_size &&
1235             (ci->i_reported_size << 1) < ci->i_max_size)
1236                 ret = 1;
1237
1238         spin_unlock(&inode->i_lock);
1239         return ret;
1240 }
1241
1242 /*
1243  * Write back inode data in a worker thread.  (This can't be done
1244  * in the message handler context.)
1245  */
1246 void ceph_queue_writeback(struct inode *inode)
1247 {
1248         if (queue_work(ceph_inode_to_client(inode)->wb_wq,
1249                        &ceph_inode(inode)->i_wb_work)) {
1250                 dout("ceph_queue_invalidate %p\n", inode);
1251                 igrab(inode);
1252         } else {
1253                 dout("ceph_queue_invalidate %p failed\n", inode);
1254         }
1255 }
1256
1257 static void ceph_writeback_work(struct work_struct *work)
1258 {
1259         struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1260                                                   i_wb_work);
1261         struct inode *inode = &ci->vfs_inode;
1262
1263         dout("writeback %p\n", inode);
1264         filemap_fdatawrite(&inode->i_data);
1265         iput(inode);
1266 }
1267
1268 /*
1269  * queue an async invalidation
1270  */
1271 void ceph_queue_invalidate(struct inode *inode)
1272 {
1273         if (queue_work(ceph_inode_to_client(inode)->pg_inv_wq,
1274                        &ceph_inode(inode)->i_pg_inv_work)) {
1275                 dout("ceph_queue_invalidate %p\n", inode);
1276                 igrab(inode);
1277         } else {
1278                 dout("ceph_queue_invalidate %p failed\n", inode);
1279         }
1280 }
1281
1282 /*
1283  * Invalidate inode pages in a worker thread.  (This can't be done
1284  * in the message handler context.)
1285  */
1286 static void ceph_invalidate_work(struct work_struct *work)
1287 {
1288         struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1289                                                   i_pg_inv_work);
1290         struct inode *inode = &ci->vfs_inode;
1291         u32 orig_gen;
1292         int check = 0;
1293
1294         spin_lock(&inode->i_lock);
1295         dout("invalidate_pages %p gen %d revoking %d\n", inode,
1296              ci->i_rdcache_gen, ci->i_rdcache_revoking);
1297         if (ci->i_rdcache_gen == 0 ||
1298             ci->i_rdcache_revoking != ci->i_rdcache_gen) {
1299                 BUG_ON(ci->i_rdcache_revoking > ci->i_rdcache_gen);
1300                 /* nevermind! */
1301                 ci->i_rdcache_revoking = 0;
1302                 spin_unlock(&inode->i_lock);
1303                 goto out;
1304         }
1305         orig_gen = ci->i_rdcache_gen;
1306         spin_unlock(&inode->i_lock);
1307
1308         truncate_inode_pages(&inode->i_data, 0);
1309
1310         spin_lock(&inode->i_lock);
1311         if (orig_gen == ci->i_rdcache_gen) {
1312                 dout("invalidate_pages %p gen %d successful\n", inode,
1313                      ci->i_rdcache_gen);
1314                 ci->i_rdcache_gen = 0;
1315                 ci->i_rdcache_revoking = 0;
1316                 check = 1;
1317         } else {
1318                 dout("invalidate_pages %p gen %d raced, gen now %d\n",
1319                      inode, orig_gen, ci->i_rdcache_gen);
1320         }
1321         spin_unlock(&inode->i_lock);
1322
1323         if (check)
1324                 ceph_check_caps(ci, 0, NULL);
1325 out:
1326         iput(inode);
1327 }
1328
1329
1330 /*
1331  * called by trunc_wq; take i_mutex ourselves
1332  *
1333  * We also truncate in a separate thread as well.
1334  */
1335 static void ceph_vmtruncate_work(struct work_struct *work)
1336 {
1337         struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1338                                                   i_vmtruncate_work);
1339         struct inode *inode = &ci->vfs_inode;
1340
1341         dout("vmtruncate_work %p\n", inode);
1342         mutex_lock(&inode->i_mutex);
1343         __ceph_do_pending_vmtruncate(inode);
1344         mutex_unlock(&inode->i_mutex);
1345         iput(inode);
1346 }
1347
1348 /*
1349  * Queue an async vmtruncate.  If we fail to queue work, we will handle
1350  * the truncation the next time we call __ceph_do_pending_vmtruncate.
1351  */
1352 void ceph_queue_vmtruncate(struct inode *inode)
1353 {
1354         struct ceph_inode_info *ci = ceph_inode(inode);
1355
1356         if (queue_work(ceph_client(inode->i_sb)->trunc_wq,
1357                        &ci->i_vmtruncate_work)) {
1358                 dout("ceph_queue_vmtruncate %p\n", inode);
1359                 igrab(inode);
1360         } else {
1361                 dout("ceph_queue_vmtruncate %p failed, pending=%d\n",
1362                      inode, ci->i_truncate_pending);
1363         }
1364 }
1365
1366 /*
1367  * called with i_mutex held.
1368  *
1369  * Make sure any pending truncation is applied before doing anything
1370  * that may depend on it.
1371  */
1372 void __ceph_do_pending_vmtruncate(struct inode *inode)
1373 {
1374         struct ceph_inode_info *ci = ceph_inode(inode);
1375         u64 to;
1376         int wrbuffer_refs, wake = 0;
1377
1378 retry:
1379         spin_lock(&inode->i_lock);
1380         if (ci->i_truncate_pending == 0) {
1381                 dout("__do_pending_vmtruncate %p none pending\n", inode);
1382                 spin_unlock(&inode->i_lock);
1383                 return;
1384         }
1385
1386         /*
1387          * make sure any dirty snapped pages are flushed before we
1388          * possibly truncate them.. so write AND block!
1389          */
1390         if (ci->i_wrbuffer_ref_head < ci->i_wrbuffer_ref) {
1391                 dout("__do_pending_vmtruncate %p flushing snaps first\n",
1392                      inode);
1393                 spin_unlock(&inode->i_lock);
1394                 filemap_write_and_wait_range(&inode->i_data, 0,
1395                                              inode->i_sb->s_maxbytes);
1396                 goto retry;
1397         }
1398
1399         to = ci->i_truncate_size;
1400         wrbuffer_refs = ci->i_wrbuffer_ref;
1401         dout("__do_pending_vmtruncate %p (%d) to %lld\n", inode,
1402              ci->i_truncate_pending, to);
1403         spin_unlock(&inode->i_lock);
1404
1405         truncate_inode_pages(inode->i_mapping, to);
1406
1407         spin_lock(&inode->i_lock);
1408         ci->i_truncate_pending--;
1409         if (ci->i_truncate_pending == 0)
1410                 wake = 1;
1411         spin_unlock(&inode->i_lock);
1412
1413         if (wrbuffer_refs == 0)
1414                 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
1415         if (wake)
1416                 wake_up(&ci->i_cap_wq);
1417 }
1418
1419
1420 /*
1421  * symlinks
1422  */
1423 static void *ceph_sym_follow_link(struct dentry *dentry, struct nameidata *nd)
1424 {
1425         struct ceph_inode_info *ci = ceph_inode(dentry->d_inode);
1426         nd_set_link(nd, ci->i_symlink);
1427         return NULL;
1428 }
1429
1430 static const struct inode_operations ceph_symlink_iops = {
1431         .readlink = generic_readlink,
1432         .follow_link = ceph_sym_follow_link,
1433 };
1434
1435 /*
1436  * setattr
1437  */
1438 int ceph_setattr(struct dentry *dentry, struct iattr *attr)
1439 {
1440         struct inode *inode = dentry->d_inode;
1441         struct ceph_inode_info *ci = ceph_inode(inode);
1442         struct inode *parent_inode = dentry->d_parent->d_inode;
1443         const unsigned int ia_valid = attr->ia_valid;
1444         struct ceph_mds_request *req;
1445         struct ceph_mds_client *mdsc = &ceph_client(dentry->d_sb)->mdsc;
1446         int issued;
1447         int release = 0, dirtied = 0;
1448         int mask = 0;
1449         int err = 0;
1450
1451         if (ceph_snap(inode) != CEPH_NOSNAP)
1452                 return -EROFS;
1453
1454         __ceph_do_pending_vmtruncate(inode);
1455
1456         err = inode_change_ok(inode, attr);
1457         if (err != 0)
1458                 return err;
1459
1460         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETATTR,
1461                                        USE_AUTH_MDS);
1462         if (IS_ERR(req))
1463                 return PTR_ERR(req);
1464
1465         spin_lock(&inode->i_lock);
1466         issued = __ceph_caps_issued(ci, NULL);
1467         dout("setattr %p issued %s\n", inode, ceph_cap_string(issued));
1468
1469         if (ia_valid & ATTR_UID) {
1470                 dout("setattr %p uid %d -> %d\n", inode,
1471                      inode->i_uid, attr->ia_uid);
1472                 if (issued & CEPH_CAP_AUTH_EXCL) {
1473                         inode->i_uid = attr->ia_uid;
1474                         dirtied |= CEPH_CAP_AUTH_EXCL;
1475                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1476                            attr->ia_uid != inode->i_uid) {
1477                         req->r_args.setattr.uid = cpu_to_le32(attr->ia_uid);
1478                         mask |= CEPH_SETATTR_UID;
1479                         release |= CEPH_CAP_AUTH_SHARED;
1480                 }
1481         }
1482         if (ia_valid & ATTR_GID) {
1483                 dout("setattr %p gid %d -> %d\n", inode,
1484                      inode->i_gid, attr->ia_gid);
1485                 if (issued & CEPH_CAP_AUTH_EXCL) {
1486                         inode->i_gid = attr->ia_gid;
1487                         dirtied |= CEPH_CAP_AUTH_EXCL;
1488                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1489                            attr->ia_gid != inode->i_gid) {
1490                         req->r_args.setattr.gid = cpu_to_le32(attr->ia_gid);
1491                         mask |= CEPH_SETATTR_GID;
1492                         release |= CEPH_CAP_AUTH_SHARED;
1493                 }
1494         }
1495         if (ia_valid & ATTR_MODE) {
1496                 dout("setattr %p mode 0%o -> 0%o\n", inode, inode->i_mode,
1497                      attr->ia_mode);
1498                 if (issued & CEPH_CAP_AUTH_EXCL) {
1499                         inode->i_mode = attr->ia_mode;
1500                         dirtied |= CEPH_CAP_AUTH_EXCL;
1501                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1502                            attr->ia_mode != inode->i_mode) {
1503                         req->r_args.setattr.mode = cpu_to_le32(attr->ia_mode);
1504                         mask |= CEPH_SETATTR_MODE;
1505                         release |= CEPH_CAP_AUTH_SHARED;
1506                 }
1507         }
1508
1509         if (ia_valid & ATTR_ATIME) {
1510                 dout("setattr %p atime %ld.%ld -> %ld.%ld\n", inode,
1511                      inode->i_atime.tv_sec, inode->i_atime.tv_nsec,
1512                      attr->ia_atime.tv_sec, attr->ia_atime.tv_nsec);
1513                 if (issued & CEPH_CAP_FILE_EXCL) {
1514                         ci->i_time_warp_seq++;
1515                         inode->i_atime = attr->ia_atime;
1516                         dirtied |= CEPH_CAP_FILE_EXCL;
1517                 } else if ((issued & CEPH_CAP_FILE_WR) &&
1518                            timespec_compare(&inode->i_atime,
1519                                             &attr->ia_atime) < 0) {
1520                         inode->i_atime = attr->ia_atime;
1521                         dirtied |= CEPH_CAP_FILE_WR;
1522                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1523                            !timespec_equal(&inode->i_atime, &attr->ia_atime)) {
1524                         ceph_encode_timespec(&req->r_args.setattr.atime,
1525                                              &attr->ia_atime);
1526                         mask |= CEPH_SETATTR_ATIME;
1527                         release |= CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_RD |
1528                                 CEPH_CAP_FILE_WR;
1529                 }
1530         }
1531         if (ia_valid & ATTR_MTIME) {
1532                 dout("setattr %p mtime %ld.%ld -> %ld.%ld\n", inode,
1533                      inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
1534                      attr->ia_mtime.tv_sec, attr->ia_mtime.tv_nsec);
1535                 if (issued & CEPH_CAP_FILE_EXCL) {
1536                         ci->i_time_warp_seq++;
1537                         inode->i_mtime = attr->ia_mtime;
1538                         dirtied |= CEPH_CAP_FILE_EXCL;
1539                 } else if ((issued & CEPH_CAP_FILE_WR) &&
1540                            timespec_compare(&inode->i_mtime,
1541                                             &attr->ia_mtime) < 0) {
1542                         inode->i_mtime = attr->ia_mtime;
1543                         dirtied |= CEPH_CAP_FILE_WR;
1544                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1545                            !timespec_equal(&inode->i_mtime, &attr->ia_mtime)) {
1546                         ceph_encode_timespec(&req->r_args.setattr.mtime,
1547                                              &attr->ia_mtime);
1548                         mask |= CEPH_SETATTR_MTIME;
1549                         release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD |
1550                                 CEPH_CAP_FILE_WR;
1551                 }
1552         }
1553         if (ia_valid & ATTR_SIZE) {
1554                 dout("setattr %p size %lld -> %lld\n", inode,
1555                      inode->i_size, attr->ia_size);
1556                 if (attr->ia_size > inode->i_sb->s_maxbytes) {
1557                         err = -EINVAL;
1558                         goto out;
1559                 }
1560                 if ((issued & CEPH_CAP_FILE_EXCL) &&
1561                     attr->ia_size > inode->i_size) {
1562                         inode->i_size = attr->ia_size;
1563                         inode->i_blocks =
1564                                 (attr->ia_size + (1 << 9) - 1) >> 9;
1565                         inode->i_ctime = attr->ia_ctime;
1566                         ci->i_reported_size = attr->ia_size;
1567                         dirtied |= CEPH_CAP_FILE_EXCL;
1568                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1569                            attr->ia_size != inode->i_size) {
1570                         req->r_args.setattr.size = cpu_to_le64(attr->ia_size);
1571                         req->r_args.setattr.old_size =
1572                                 cpu_to_le64(inode->i_size);
1573                         mask |= CEPH_SETATTR_SIZE;
1574                         release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD |
1575                                 CEPH_CAP_FILE_WR;
1576                 }
1577         }
1578
1579         /* these do nothing */
1580         if (ia_valid & ATTR_CTIME) {
1581                 bool only = (ia_valid & (ATTR_SIZE|ATTR_MTIME|ATTR_ATIME|
1582                                          ATTR_MODE|ATTR_UID|ATTR_GID)) == 0;
1583                 dout("setattr %p ctime %ld.%ld -> %ld.%ld (%s)\n", inode,
1584                      inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
1585                      attr->ia_ctime.tv_sec, attr->ia_ctime.tv_nsec,
1586                      only ? "ctime only" : "ignored");
1587                 inode->i_ctime = attr->ia_ctime;
1588                 if (only) {
1589                         /*
1590                          * if kernel wants to dirty ctime but nothing else,
1591                          * we need to choose a cap to dirty under, or do
1592                          * a almost-no-op setattr
1593                          */
1594                         if (issued & CEPH_CAP_AUTH_EXCL)
1595                                 dirtied |= CEPH_CAP_AUTH_EXCL;
1596                         else if (issued & CEPH_CAP_FILE_EXCL)
1597                                 dirtied |= CEPH_CAP_FILE_EXCL;
1598                         else if (issued & CEPH_CAP_XATTR_EXCL)
1599                                 dirtied |= CEPH_CAP_XATTR_EXCL;
1600                         else
1601                                 mask |= CEPH_SETATTR_CTIME;
1602                 }
1603         }
1604         if (ia_valid & ATTR_FILE)
1605                 dout("setattr %p ATTR_FILE ... hrm!\n", inode);
1606
1607         if (dirtied) {
1608                 __ceph_mark_dirty_caps(ci, dirtied);
1609                 inode->i_ctime = CURRENT_TIME;
1610         }
1611
1612         release &= issued;
1613         spin_unlock(&inode->i_lock);
1614
1615         if (mask) {
1616                 req->r_inode = igrab(inode);
1617                 req->r_inode_drop = release;
1618                 req->r_args.setattr.mask = cpu_to_le32(mask);
1619                 req->r_num_caps = 1;
1620                 err = ceph_mdsc_do_request(mdsc, parent_inode, req);
1621         }
1622         dout("setattr %p result=%d (%s locally, %d remote)\n", inode, err,
1623              ceph_cap_string(dirtied), mask);
1624
1625         ceph_mdsc_put_request(req);
1626         __ceph_do_pending_vmtruncate(inode);
1627         return err;
1628 out:
1629         spin_unlock(&inode->i_lock);
1630         ceph_mdsc_put_request(req);
1631         return err;
1632 }
1633
1634 /*
1635  * Verify that we have a lease on the given mask.  If not,
1636  * do a getattr against an mds.
1637  */
1638 int ceph_do_getattr(struct inode *inode, int mask)
1639 {
1640         struct ceph_client *client = ceph_sb_to_client(inode->i_sb);
1641         struct ceph_mds_client *mdsc = &client->mdsc;
1642         struct ceph_mds_request *req;
1643         int err;
1644
1645         if (ceph_snap(inode) == CEPH_SNAPDIR) {
1646                 dout("do_getattr inode %p SNAPDIR\n", inode);
1647                 return 0;
1648         }
1649
1650         dout("do_getattr inode %p mask %s\n", inode, ceph_cap_string(mask));
1651         if (ceph_caps_issued_mask(ceph_inode(inode), mask, 1))
1652                 return 0;
1653
1654         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
1655         if (IS_ERR(req))
1656                 return PTR_ERR(req);
1657         req->r_inode = igrab(inode);
1658         req->r_num_caps = 1;
1659         req->r_args.getattr.mask = cpu_to_le32(mask);
1660         err = ceph_mdsc_do_request(mdsc, NULL, req);
1661         ceph_mdsc_put_request(req);
1662         dout("do_getattr result=%d\n", err);
1663         return err;
1664 }
1665
1666
1667 /*
1668  * Check inode permissions.  We verify we have a valid value for
1669  * the AUTH cap, then call the generic handler.
1670  */
1671 int ceph_permission(struct inode *inode, int mask)
1672 {
1673         int err = ceph_do_getattr(inode, CEPH_CAP_AUTH_SHARED);
1674
1675         if (!err)
1676                 err = generic_permission(inode, mask, NULL);
1677         return err;
1678 }
1679
1680 /*
1681  * Get all attributes.  Hopefully somedata we'll have a statlite()
1682  * and can limit the fields we require to be accurate.
1683  */
1684 int ceph_getattr(struct vfsmount *mnt, struct dentry *dentry,
1685                  struct kstat *stat)
1686 {
1687         struct inode *inode = dentry->d_inode;
1688         struct ceph_inode_info *ci = ceph_inode(inode);
1689         int err;
1690
1691         err = ceph_do_getattr(inode, CEPH_STAT_CAP_INODE_ALL);
1692         if (!err) {
1693                 generic_fillattr(inode, stat);
1694                 stat->ino = inode->i_ino;
1695                 if (ceph_snap(inode) != CEPH_NOSNAP)
1696                         stat->dev = ceph_snap(inode);
1697                 else
1698                         stat->dev = 0;
1699                 if (S_ISDIR(inode->i_mode)) {
1700                         stat->size = ci->i_rbytes;
1701                         stat->blocks = 0;
1702                         stat->blksize = 65536;
1703                 }
1704         }
1705         return err;
1706 }