fs/ceph/inode.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <linux/ceph/ceph_debug.h>
   3
   4 #include <linux/module.h>
   5 #include <linux/fs.h>
   6 #include <linux/slab.h>
   7 #include <linux/string.h>
   8 #include <linux/uaccess.h>
   9 #include <linux/kernel.h>
  10 #include <linux/writeback.h>
  11 #include <linux/vmalloc.h>
  12 #include <linux/xattr.h>
  13 #include <linux/posix_acl.h>
  14 #include <linux/random.h>
  15 #include <linux/sort.h>
  16 #include <linux/iversion.h>
  17
  18 #include "super.h"
  19 #include "mds_client.h"
  20 #include "cache.h"
  21 #include <linux/ceph/decode.h>
  22
  23 /*
  24  * Ceph inode operations
  25  *
  26  * Implement basic inode helpers (get, alloc) and inode ops (getattr,
  27  * setattr, etc.), xattr helpers, and helpers for assimilating
  28  * metadata returned by the MDS into our cache.
  29  *
  30  * Also define helpers for doing asynchronous writeback, invalidation,
  31  * and truncation for the benefit of those who can't afford to block
  32  * (typically because they are in the message handler path).
  33  */
  34
  35 static const struct inode_operations ceph_symlink_iops;
  36
  37 static void ceph_inode_work(struct work_struct *work);
  38
  39 /*
  40  * find or create an inode, given the ceph ino number
  41  */
  42 static int ceph_set_ino_cb(struct inode *inode, void *data)
  43 {
  44         struct ceph_inode_info *ci = ceph_inode(inode);
  45         struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb);
  46
  47         ci->i_vino = *(struct ceph_vino *)data;
  48         inode->i_ino = ceph_vino_to_ino_t(ci->i_vino);
  49         inode_set_iversion_raw(inode, 0);
  50         percpu_counter_inc(&mdsc->metric.total_inodes);
  51
  52         return 0;
  53 }
  54
  55 struct inode *ceph_get_inode(struct super_block *sb, struct ceph_vino vino)
  56 {
  57         struct inode *inode;
  58
  59         if (ceph_vino_is_reserved(vino))
  60                 return ERR_PTR(-EREMOTEIO);
  61
  62         inode = iget5_locked(sb, (unsigned long)vino.ino, ceph_ino_compare,
  63                              ceph_set_ino_cb, &vino);
  64         if (!inode)
  65                 return ERR_PTR(-ENOMEM);
  66
  67         dout("get_inode on %llu=%llx.%llx got %p new %d\n", ceph_present_inode(inode),
  68              ceph_vinop(inode), inode, !!(inode->i_state & I_NEW));
  69         return inode;
  70 }
  71
  72 /*
  73  * get/constuct snapdir inode for a given directory
  74  */
  75 struct inode *ceph_get_snapdir(struct inode *parent)
  76 {
  77         struct ceph_vino vino = {
  78                 .ino = ceph_ino(parent),
  79                 .snap = CEPH_SNAPDIR,
  80         };
  81         struct inode *inode = ceph_get_inode(parent->i_sb, vino);
  82         struct ceph_inode_info *ci = ceph_inode(inode);
  83
  84         if (IS_ERR(inode))
  85                 return inode;
  86
  87         if (!S_ISDIR(parent->i_mode)) {
  88                 pr_warn_once("bad snapdir parent type (mode=0%o)\n",
  89                              parent->i_mode);
  90                 goto err;
  91         }
  92
  93         if (!(inode->i_state & I_NEW) && !S_ISDIR(inode->i_mode)) {
  94                 pr_warn_once("bad snapdir inode type (mode=0%o)\n",
  95                              inode->i_mode);
  96                 goto err;
  97         }
  98
  99         inode->i_mode = parent->i_mode;
 100         inode->i_uid = parent->i_uid;
 101         inode->i_gid = parent->i_gid;
 102         inode->i_mtime = parent->i_mtime;
 103         inode->i_ctime = parent->i_ctime;
 104         inode->i_atime = parent->i_atime;
 105         ci->i_rbytes = 0;
 106         ci->i_btime = ceph_inode(parent)->i_btime;
 107
 108         if (inode->i_state & I_NEW) {
 109                 inode->i_op = &ceph_snapdir_iops;
 110                 inode->i_fop = &ceph_snapdir_fops;
 111                 ci->i_snap_caps = CEPH_CAP_PIN; /* so we can open */
 112                 unlock_new_inode(inode);
 113         }
 114
 115         return inode;
 116 err:
 117         if ((inode->i_state & I_NEW))
 118                 discard_new_inode(inode);
 119         else
 120                 iput(inode);
 121         return ERR_PTR(-ENOTDIR);
 122 }
 123
 124 const struct inode_operations ceph_file_iops = {
 125         .permission = ceph_permission,
 126         .setattr = ceph_setattr,
 127         .getattr = ceph_getattr,
 128         .listxattr = ceph_listxattr,
 129         .get_acl = ceph_get_acl,
 130         .set_acl = ceph_set_acl,
 131 };
 132
 133
 134 /*
 135  * We use a 'frag tree' to keep track of the MDS's directory fragments
 136  * for a given inode (usually there is just a single fragment).  We
 137  * need to know when a child frag is delegated to a new MDS, or when
 138  * it is flagged as replicated, so we can direct our requests
 139  * accordingly.
 140  */
 141
 142 /*
 143  * find/create a frag in the tree
 144  */
 145 static struct ceph_inode_frag *__get_or_create_frag(struct ceph_inode_info *ci,
 146                                                     u32 f)
 147 {
 148         struct rb_node **p;
 149         struct rb_node *parent = NULL;
 150         struct ceph_inode_frag *frag;
 151         int c;
 152
 153         p = &ci->i_fragtree.rb_node;
 154         while (*p) {
 155                 parent = *p;
 156                 frag = rb_entry(parent, struct ceph_inode_frag, node);
 157                 c = ceph_frag_compare(f, frag->frag);
 158                 if (c < 0)
 159                         p = &(*p)->rb_left;
 160                 else if (c > 0)
 161                         p = &(*p)->rb_right;
 162                 else
 163                         return frag;
 164         }
 165
 166         frag = kmalloc(sizeof(*frag), GFP_NOFS);
 167         if (!frag)
 168                 return ERR_PTR(-ENOMEM);
 169
 170         frag->frag = f;
 171         frag->split_by = 0;
 172         frag->mds = -1;
 173         frag->ndist = 0;
 174
 175         rb_link_node(&frag->node, parent, p);
 176         rb_insert_color(&frag->node, &ci->i_fragtree);
 177
 178         dout("get_or_create_frag added %llx.%llx frag %x\n",
 179              ceph_vinop(&ci->vfs_inode), f);
 180         return frag;
 181 }
 182
 183 /*
 184  * find a specific frag @f
 185  */
 186 struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci, u32 f)
 187 {
 188         struct rb_node *n = ci->i_fragtree.rb_node;
 189
 190         while (n) {
 191                 struct ceph_inode_frag *frag =
 192                         rb_entry(n, struct ceph_inode_frag, node);
 193                 int c = ceph_frag_compare(f, frag->frag);
 194                 if (c < 0)
 195                         n = n->rb_left;
 196                 else if (c > 0)
 197                         n = n->rb_right;
 198                 else
 199                         return frag;
 200         }
 201         return NULL;
 202 }
 203
 204 /*
 205  * Choose frag containing the given value @v.  If @pfrag is
 206  * specified, copy the frag delegation info to the caller if
 207  * it is present.
 208  */
 209 static u32 __ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
 210                               struct ceph_inode_frag *pfrag, int *found)
 211 {
 212         u32 t = ceph_frag_make(0, 0);
 213         struct ceph_inode_frag *frag;
 214         unsigned nway, i;
 215         u32 n;
 216
 217         if (found)
 218                 *found = 0;
 219
 220         while (1) {
 221                 WARN_ON(!ceph_frag_contains_value(t, v));
 222                 frag = __ceph_find_frag(ci, t);
 223                 if (!frag)
 224                         break; /* t is a leaf */
 225                 if (frag->split_by == 0) {
 226                         if (pfrag)
 227                                 memcpy(pfrag, frag, sizeof(*pfrag));
 228                         if (found)
 229                                 *found = 1;
 230                         break;
 231                 }
 232
 233                 /* choose child */
 234                 nway = 1 << frag->split_by;
 235                 dout("choose_frag(%x) %x splits by %d (%d ways)\n", v, t,
 236                      frag->split_by, nway);
 237                 for (i = 0; i < nway; i++) {
 238                         n = ceph_frag_make_child(t, frag->split_by, i);
 239                         if (ceph_frag_contains_value(n, v)) {
 240                                 t = n;
 241                                 break;
 242                         }
 243                 }
 244                 BUG_ON(i == nway);
 245         }
 246         dout("choose_frag(%x) = %x\n", v, t);
 247
 248         return t;
 249 }
 250
 251 u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
 252                      struct ceph_inode_frag *pfrag, int *found)
 253 {
 254         u32 ret;
 255         mutex_lock(&ci->i_fragtree_mutex);
 256         ret = __ceph_choose_frag(ci, v, pfrag, found);
 257         mutex_unlock(&ci->i_fragtree_mutex);
 258         return ret;
 259 }
 260
 261 /*
 262  * Process dirfrag (delegation) info from the mds.  Include leaf
 263  * fragment in tree ONLY if ndist > 0.  Otherwise, only
 264  * branches/splits are included in i_fragtree)
 265  */
 266 static int ceph_fill_dirfrag(struct inode *inode,
 267                              struct ceph_mds_reply_dirfrag *dirinfo)
 268 {
 269         struct ceph_inode_info *ci = ceph_inode(inode);
 270         struct ceph_inode_frag *frag;
 271         u32 id = le32_to_cpu(dirinfo->frag);
 272         int mds = le32_to_cpu(dirinfo->auth);
 273         int ndist = le32_to_cpu(dirinfo->ndist);
 274         int diri_auth = -1;
 275         int i;
 276         int err = 0;
 277
 278         spin_lock(&ci->i_ceph_lock);
 279         if (ci->i_auth_cap)
 280                 diri_auth = ci->i_auth_cap->mds;
 281         spin_unlock(&ci->i_ceph_lock);
 282
 283         if (mds == -1) /* CDIR_AUTH_PARENT */
 284                 mds = diri_auth;
 285
 286         mutex_lock(&ci->i_fragtree_mutex);
 287         if (ndist == 0 && mds == diri_auth) {
 288                 /* no delegation info needed. */
 289                 frag = __ceph_find_frag(ci, id);
 290                 if (!frag)
 291                         goto out;
 292                 if (frag->split_by == 0) {
 293                         /* tree leaf, remove */
 294                         dout("fill_dirfrag removed %llx.%llx frag %x"
 295                              " (no ref)\n", ceph_vinop(inode), id);
 296                         rb_erase(&frag->node, &ci->i_fragtree);
 297                         kfree(frag);
 298                 } else {
 299                         /* tree branch, keep and clear */
 300                         dout("fill_dirfrag cleared %llx.%llx frag %x"
 301                              " referral\n", ceph_vinop(inode), id);
 302                         frag->mds = -1;
 303                         frag->ndist = 0;
 304                 }
 305                 goto out;
 306         }
 307
 308
 309         /* find/add this frag to store mds delegation info */
 310         frag = __get_or_create_frag(ci, id);
 311         if (IS_ERR(frag)) {
 312                 /* this is not the end of the world; we can continue
 313                    with bad/inaccurate delegation info */
 314                 pr_err("fill_dirfrag ENOMEM on mds ref %llx.%llx fg %x\n",
 315                        ceph_vinop(inode), le32_to_cpu(dirinfo->frag));
 316                 err = -ENOMEM;
 317                 goto out;
 318         }
 319
 320         frag->mds = mds;
 321         frag->ndist = min_t(u32, ndist, CEPH_MAX_DIRFRAG_REP);
 322         for (i = 0; i < frag->ndist; i++)
 323                 frag->dist[i] = le32_to_cpu(dirinfo->dist[i]);
 324         dout("fill_dirfrag %llx.%llx frag %x ndist=%d\n",
 325              ceph_vinop(inode), frag->frag, frag->ndist);
 326
 327 out:
 328         mutex_unlock(&ci->i_fragtree_mutex);
 329         return err;
 330 }
 331
 332 static int frag_tree_split_cmp(const void *l, const void *r)
 333 {
 334         struct ceph_frag_tree_split *ls = (struct ceph_frag_tree_split*)l;
 335         struct ceph_frag_tree_split *rs = (struct ceph_frag_tree_split*)r;
 336         return ceph_frag_compare(le32_to_cpu(ls->frag),
 337                                  le32_to_cpu(rs->frag));
 338 }
 339
 340 static bool is_frag_child(u32 f, struct ceph_inode_frag *frag)
 341 {
 342         if (!frag)
 343                 return f == ceph_frag_make(0, 0);
 344         if (ceph_frag_bits(f) != ceph_frag_bits(frag->frag) + frag->split_by)
 345                 return false;
 346         return ceph_frag_contains_value(frag->frag, ceph_frag_value(f));
 347 }
 348
 349 static int ceph_fill_fragtree(struct inode *inode,
 350                               struct ceph_frag_tree_head *fragtree,
 351                               struct ceph_mds_reply_dirfrag *dirinfo)
 352 {
 353         struct ceph_inode_info *ci = ceph_inode(inode);
 354         struct ceph_inode_frag *frag, *prev_frag = NULL;
 355         struct rb_node *rb_node;
 356         unsigned i, split_by, nsplits;
 357         u32 id;
 358         bool update = false;
 359
 360         mutex_lock(&ci->i_fragtree_mutex);
 361         nsplits = le32_to_cpu(fragtree->nsplits);
 362         if (nsplits != ci->i_fragtree_nsplits) {
 363                 update = true;
 364         } else if (nsplits) {
 365                 i = prandom_u32() % nsplits;
 366                 id = le32_to_cpu(fragtree->splits[i].frag);
 367                 if (!__ceph_find_frag(ci, id))
 368                         update = true;
 369         } else if (!RB_EMPTY_ROOT(&ci->i_fragtree)) {
 370                 rb_node = rb_first(&ci->i_fragtree);
 371                 frag = rb_entry(rb_node, struct ceph_inode_frag, node);
 372                 if (frag->frag != ceph_frag_make(0, 0) || rb_next(rb_node))
 373                         update = true;
 374         }
 375         if (!update && dirinfo) {
 376                 id = le32_to_cpu(dirinfo->frag);
 377                 if (id != __ceph_choose_frag(ci, id, NULL, NULL))
 378                         update = true;
 379         }
 380         if (!update)
 381                 goto out_unlock;
 382
 383         if (nsplits > 1) {
 384                 sort(fragtree->splits, nsplits, sizeof(fragtree->splits[0]),
 385                      frag_tree_split_cmp, NULL);
 386         }
 387
 388         dout("fill_fragtree %llx.%llx\n", ceph_vinop(inode));
 389         rb_node = rb_first(&ci->i_fragtree);
 390         for (i = 0; i < nsplits; i++) {
 391                 id = le32_to_cpu(fragtree->splits[i].frag);
 392                 split_by = le32_to_cpu(fragtree->splits[i].by);
 393                 if (split_by == 0 || ceph_frag_bits(id) + split_by > 24) {
 394                         pr_err("fill_fragtree %llx.%llx invalid split %d/%u, "
 395                                "frag %x split by %d\n", ceph_vinop(inode),
 396                                i, nsplits, id, split_by);
 397                         continue;
 398                 }
 399                 frag = NULL;
 400                 while (rb_node) {
 401                         frag = rb_entry(rb_node, struct ceph_inode_frag, node);
 402                         if (ceph_frag_compare(frag->frag, id) >= 0) {
 403                                 if (frag->frag != id)
 404                                         frag = NULL;
 405                                 else
 406                                         rb_node = rb_next(rb_node);
 407                                 break;
 408                         }
 409                         rb_node = rb_next(rb_node);
 410                         /* delete stale split/leaf node */
 411                         if (frag->split_by > 0 ||
 412                             !is_frag_child(frag->frag, prev_frag)) {
 413                                 rb_erase(&frag->node, &ci->i_fragtree);
 414                                 if (frag->split_by > 0)
 415                                         ci->i_fragtree_nsplits--;
 416                                 kfree(frag);
 417                         }
 418                         frag = NULL;
 419                 }
 420                 if (!frag) {
 421                         frag = __get_or_create_frag(ci, id);
 422                         if (IS_ERR(frag))
 423                                 continue;
 424                 }
 425                 if (frag->split_by == 0)
 426                         ci->i_fragtree_nsplits++;
 427                 frag->split_by = split_by;
 428                 dout(" frag %x split by %d\n", frag->frag, frag->split_by);
 429                 prev_frag = frag;
 430         }
 431         while (rb_node) {
 432                 frag = rb_entry(rb_node, struct ceph_inode_frag, node);
 433                 rb_node = rb_next(rb_node);
 434                 /* delete stale split/leaf node */
 435                 if (frag->split_by > 0 ||
 436                     !is_frag_child(frag->frag, prev_frag)) {
 437                         rb_erase(&frag->node, &ci->i_fragtree);
 438                         if (frag->split_by > 0)
 439                                 ci->i_fragtree_nsplits--;
 440                         kfree(frag);
 441                 }
 442         }
 443 out_unlock:
 444         mutex_unlock(&ci->i_fragtree_mutex);
 445         return 0;
 446 }
 447
 448 /*
 449  * initialize a newly allocated inode.
 450  */
 451 struct inode *ceph_alloc_inode(struct super_block *sb)
 452 {
 453         struct ceph_inode_info *ci;
 454         int i;
 455
 456         ci = alloc_inode_sb(sb, ceph_inode_cachep, GFP_NOFS);
 457         if (!ci)
 458                 return NULL;
 459
 460         dout("alloc_inode %p\n", &ci->vfs_inode);
 461
 462         spin_lock_init(&ci->i_ceph_lock);
 463
 464         ci->i_version = 0;
 465         ci->i_inline_version = 0;
 466         ci->i_time_warp_seq = 0;
 467         ci->i_ceph_flags = 0;
 468         atomic64_set(&ci->i_ordered_count, 1);
 469         atomic64_set(&ci->i_release_count, 1);
 470         atomic64_set(&ci->i_complete_seq[0], 0);
 471         atomic64_set(&ci->i_complete_seq[1], 0);
 472         ci->i_symlink = NULL;
 473
 474         ci->i_max_bytes = 0;
 475         ci->i_max_files = 0;
 476
 477         memset(&ci->i_dir_layout, 0, sizeof(ci->i_dir_layout));
 478         memset(&ci->i_cached_layout, 0, sizeof(ci->i_cached_layout));
 479         RCU_INIT_POINTER(ci->i_layout.pool_ns, NULL);
 480
 481         ci->i_fragtree = RB_ROOT;
 482         mutex_init(&ci->i_fragtree_mutex);
 483
 484         ci->i_xattrs.blob = NULL;
 485         ci->i_xattrs.prealloc_blob = NULL;
 486         ci->i_xattrs.dirty = false;
 487         ci->i_xattrs.index = RB_ROOT;
 488         ci->i_xattrs.count = 0;
 489         ci->i_xattrs.names_size = 0;
 490         ci->i_xattrs.vals_size = 0;
 491         ci->i_xattrs.version = 0;
 492         ci->i_xattrs.index_version = 0;
 493
 494         ci->i_caps = RB_ROOT;
 495         ci->i_auth_cap = NULL;
 496         ci->i_dirty_caps = 0;
 497         ci->i_flushing_caps = 0;
 498         INIT_LIST_HEAD(&ci->i_dirty_item);
 499         INIT_LIST_HEAD(&ci->i_flushing_item);
 500         ci->i_prealloc_cap_flush = NULL;
 501         INIT_LIST_HEAD(&ci->i_cap_flush_list);
 502         init_waitqueue_head(&ci->i_cap_wq);
 503         ci->i_hold_caps_max = 0;
 504         INIT_LIST_HEAD(&ci->i_cap_delay_list);
 505         INIT_LIST_HEAD(&ci->i_cap_snaps);
 506         ci->i_head_snapc = NULL;
 507         ci->i_snap_caps = 0;
 508
 509         ci->i_last_rd = ci->i_last_wr = jiffies - 3600 * HZ;
 510         for (i = 0; i < CEPH_FILE_MODE_BITS; i++)
 511                 ci->i_nr_by_mode[i] = 0;
 512
 513         mutex_init(&ci->i_truncate_mutex);
 514         ci->i_truncate_seq = 0;
 515         ci->i_truncate_size = 0;
 516         ci->i_truncate_pending = 0;
 517
 518         ci->i_max_size = 0;
 519         ci->i_reported_size = 0;
 520         ci->i_wanted_max_size = 0;
 521         ci->i_requested_max_size = 0;
 522
 523         ci->i_pin_ref = 0;
 524         ci->i_rd_ref = 0;
 525         ci->i_rdcache_ref = 0;
 526         ci->i_wr_ref = 0;
 527         ci->i_wb_ref = 0;
 528         ci->i_fx_ref = 0;
 529         ci->i_wrbuffer_ref = 0;
 530         ci->i_wrbuffer_ref_head = 0;
 531         atomic_set(&ci->i_filelock_ref, 0);
 532         atomic_set(&ci->i_shared_gen, 1);
 533         ci->i_rdcache_gen = 0;
 534         ci->i_rdcache_revoking = 0;
 535
 536         INIT_LIST_HEAD(&ci->i_unsafe_dirops);
 537         INIT_LIST_HEAD(&ci->i_unsafe_iops);
 538         spin_lock_init(&ci->i_unsafe_lock);
 539
 540         ci->i_snap_realm = NULL;
 541         INIT_LIST_HEAD(&ci->i_snap_realm_item);
 542         INIT_LIST_HEAD(&ci->i_snap_flush_item);
 543
 544         INIT_WORK(&ci->i_work, ceph_inode_work);
 545         ci->i_work_mask = 0;
 546         memset(&ci->i_btime, '\0', sizeof(ci->i_btime));
 547
 548         ceph_fscache_inode_init(ci);
 549
 550         return &ci->vfs_inode;
 551 }
 552
 553 void ceph_free_inode(struct inode *inode)
 554 {
 555         struct ceph_inode_info *ci = ceph_inode(inode);
 556
 557         kfree(ci->i_symlink);
 558         kmem_cache_free(ceph_inode_cachep, ci);
 559 }
 560
 561 void ceph_evict_inode(struct inode *inode)
 562 {
 563         struct ceph_inode_info *ci = ceph_inode(inode);
 564         struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb);
 565         struct ceph_inode_frag *frag;
 566         struct rb_node *n;
 567
 568         dout("evict_inode %p ino %llx.%llx\n", inode, ceph_vinop(inode));
 569
 570         percpu_counter_dec(&mdsc->metric.total_inodes);
 571
 572         truncate_inode_pages_final(&inode->i_data);
 573         if (inode->i_state & I_PINNING_FSCACHE_WB)
 574                 ceph_fscache_unuse_cookie(inode, true);
 575         clear_inode(inode);
 576
 577         ceph_fscache_unregister_inode_cookie(ci);
 578
 579         __ceph_remove_caps(ci);
 580
 581         if (__ceph_has_any_quota(ci))
 582                 ceph_adjust_quota_realms_count(inode, false);
 583
 584         /*
 585          * we may still have a snap_realm reference if there are stray
 586          * caps in i_snap_caps.
 587          */
 588         if (ci->i_snap_realm) {
 589                 if (ceph_snap(inode) == CEPH_NOSNAP) {
 590                         dout(" dropping residual ref to snap realm %p\n",
 591                              ci->i_snap_realm);
 592                         ceph_change_snap_realm(inode, NULL);
 593                 } else {
 594                         ceph_put_snapid_map(mdsc, ci->i_snapid_map);
 595                         ci->i_snap_realm = NULL;
 596                 }
 597         }
 598
 599         while ((n = rb_first(&ci->i_fragtree)) != NULL) {
 600                 frag = rb_entry(n, struct ceph_inode_frag, node);
 601                 rb_erase(n, &ci->i_fragtree);
 602                 kfree(frag);
 603         }
 604         ci->i_fragtree_nsplits = 0;
 605
 606         __ceph_destroy_xattrs(ci);
 607         if (ci->i_xattrs.blob)
 608                 ceph_buffer_put(ci->i_xattrs.blob);
 609         if (ci->i_xattrs.prealloc_blob)
 610                 ceph_buffer_put(ci->i_xattrs.prealloc_blob);
 611
 612         ceph_put_string(rcu_dereference_raw(ci->i_layout.pool_ns));
 613         ceph_put_string(rcu_dereference_raw(ci->i_cached_layout.pool_ns));
 614 }
 615
 616 static inline blkcnt_t calc_inode_blocks(u64 size)
 617 {
 618         return (size + (1<<9) - 1) >> 9;
 619 }
 620
 621 /*
 622  * Helpers to fill in size, ctime, mtime, and atime.  We have to be
 623  * careful because either the client or MDS may have more up to date
 624  * info, depending on which capabilities are held, and whether
 625  * time_warp_seq or truncate_seq have increased.  (Ordinarily, mtime
 626  * and size are monotonically increasing, except when utimes() or
 627  * truncate() increments the corresponding _seq values.)
 628  */
 629 int ceph_fill_file_size(struct inode *inode, int issued,
 630                         u32 truncate_seq, u64 truncate_size, u64 size)
 631 {
 632         struct ceph_inode_info *ci = ceph_inode(inode);
 633         int queue_trunc = 0;
 634         loff_t isize = i_size_read(inode);
 635
 636         if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) > 0 ||
 637             (truncate_seq == ci->i_truncate_seq && size > isize)) {
 638                 dout("size %lld -> %llu\n", isize, size);
 639                 if (size > 0 && S_ISDIR(inode->i_mode)) {
 640                         pr_err("fill_file_size non-zero size for directory\n");
 641                         size = 0;
 642                 }
 643                 i_size_write(inode, size);
 644                 inode->i_blocks = calc_inode_blocks(size);
 645                 /*
 646                  * If we're expanding, then we should be able to just update
 647                  * the existing cookie.
 648                  */
 649                 if (size > isize)
 650                         ceph_fscache_update(inode);
 651                 ci->i_reported_size = size;
 652                 if (truncate_seq != ci->i_truncate_seq) {
 653                         dout("truncate_seq %u -> %u\n",
 654                              ci->i_truncate_seq, truncate_seq);
 655                         ci->i_truncate_seq = truncate_seq;
 656
 657                         /* the MDS should have revoked these caps */
 658                         WARN_ON_ONCE(issued & (CEPH_CAP_FILE_EXCL |
 659                                                CEPH_CAP_FILE_RD |
 660                                                CEPH_CAP_FILE_WR |
 661                                                CEPH_CAP_FILE_LAZYIO));
 662                         /*
 663                          * If we hold relevant caps, or in the case where we're
 664                          * not the only client referencing this file and we
 665                          * don't hold those caps, then we need to check whether
 666                          * the file is either opened or mmaped
 667                          */
 668                         if ((issued & (CEPH_CAP_FILE_CACHE|
 669                                        CEPH_CAP_FILE_BUFFER)) ||
 670                             mapping_mapped(inode->i_mapping) ||
 671                             __ceph_is_file_opened(ci)) {
 672                                 ci->i_truncate_pending++;
 673                                 queue_trunc = 1;
 674                         }
 675                 }
 676         }
 677         if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) >= 0 &&
 678             ci->i_truncate_size != truncate_size) {
 679                 dout("truncate_size %lld -> %llu\n", ci->i_truncate_size,
 680                      truncate_size);
 681                 ci->i_truncate_size = truncate_size;
 682         }
 683         return queue_trunc;
 684 }
 685
 686 void ceph_fill_file_time(struct inode *inode, int issued,
 687                          u64 time_warp_seq, struct timespec64 *ctime,
 688                          struct timespec64 *mtime, struct timespec64 *atime)
 689 {
 690         struct ceph_inode_info *ci = ceph_inode(inode);
 691         int warn = 0;
 692
 693         if (issued & (CEPH_CAP_FILE_EXCL|
 694                       CEPH_CAP_FILE_WR|
 695                       CEPH_CAP_FILE_BUFFER|
 696                       CEPH_CAP_AUTH_EXCL|
 697                       CEPH_CAP_XATTR_EXCL)) {
 698                 if (ci->i_version == 0 ||
 699                     timespec64_compare(ctime, &inode->i_ctime) > 0) {
 700                         dout("ctime %lld.%09ld -> %lld.%09ld inc w/ cap\n",
 701                              inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
 702                              ctime->tv_sec, ctime->tv_nsec);
 703                         inode->i_ctime = *ctime;
 704                 }
 705                 if (ci->i_version == 0 ||
 706                     ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) > 0) {
 707                         /* the MDS did a utimes() */
 708                         dout("mtime %lld.%09ld -> %lld.%09ld "
 709                              "tw %d -> %d\n",
 710                              inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
 711                              mtime->tv_sec, mtime->tv_nsec,
 712                              ci->i_time_warp_seq, (int)time_warp_seq);
 713
 714                         inode->i_mtime = *mtime;
 715                         inode->i_atime = *atime;
 716                         ci->i_time_warp_seq = time_warp_seq;
 717                 } else if (time_warp_seq == ci->i_time_warp_seq) {
 718                         /* nobody did utimes(); take the max */
 719                         if (timespec64_compare(mtime, &inode->i_mtime) > 0) {
 720                                 dout("mtime %lld.%09ld -> %lld.%09ld inc\n",
 721                                      inode->i_mtime.tv_sec,
 722                                      inode->i_mtime.tv_nsec,
 723                                      mtime->tv_sec, mtime->tv_nsec);
 724                                 inode->i_mtime = *mtime;
 725                         }
 726                         if (timespec64_compare(atime, &inode->i_atime) > 0) {
 727                                 dout("atime %lld.%09ld -> %lld.%09ld inc\n",
 728                                      inode->i_atime.tv_sec,
 729                                      inode->i_atime.tv_nsec,
 730                                      atime->tv_sec, atime->tv_nsec);
 731                                 inode->i_atime = *atime;
 732                         }
 733                 } else if (issued & CEPH_CAP_FILE_EXCL) {
 734                         /* we did a utimes(); ignore mds values */
 735                 } else {
 736                         warn = 1;
 737                 }
 738         } else {
 739                 /* we have no write|excl caps; whatever the MDS says is true */
 740                 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) >= 0) {
 741                         inode->i_ctime = *ctime;
 742                         inode->i_mtime = *mtime;
 743                         inode->i_atime = *atime;
 744                         ci->i_time_warp_seq = time_warp_seq;
 745                 } else {
 746                         warn = 1;
 747                 }
 748         }
 749         if (warn) /* time_warp_seq shouldn't go backwards */
 750                 dout("%p mds time_warp_seq %llu < %u\n",
 751                      inode, time_warp_seq, ci->i_time_warp_seq);
 752 }
 753
 754 /*
 755  * Populate an inode based on info from mds.  May be called on new or
 756  * existing inodes.
 757  */
 758 int ceph_fill_inode(struct inode *inode, struct page *locked_page,
 759                     struct ceph_mds_reply_info_in *iinfo,
 760                     struct ceph_mds_reply_dirfrag *dirinfo,
 761                     struct ceph_mds_session *session, int cap_fmode,
 762                     struct ceph_cap_reservation *caps_reservation)
 763 {
 764         struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb);
 765         struct ceph_mds_reply_inode *info = iinfo->in;
 766         struct ceph_inode_info *ci = ceph_inode(inode);
 767         int issued, new_issued, info_caps;
 768         struct timespec64 mtime, atime, ctime;
 769         struct ceph_buffer *xattr_blob = NULL;
 770         struct ceph_buffer *old_blob = NULL;
 771         struct ceph_string *pool_ns = NULL;
 772         struct ceph_cap *new_cap = NULL;
 773         int err = 0;
 774         bool wake = false;
 775         bool queue_trunc = false;
 776         bool new_version = false;
 777         bool fill_inline = false;
 778         umode_t mode = le32_to_cpu(info->mode);
 779         dev_t rdev = le32_to_cpu(info->rdev);
 780
 781         lockdep_assert_held(&mdsc->snap_rwsem);
 782
 783         dout("%s %p ino %llx.%llx v %llu had %llu\n", __func__,
 784              inode, ceph_vinop(inode), le64_to_cpu(info->version),
 785              ci->i_version);
 786
 787         /* Once I_NEW is cleared, we can't change type or dev numbers */
 788         if (inode->i_state & I_NEW) {
 789                 inode->i_mode = mode;
 790         } else {
 791                 if (inode_wrong_type(inode, mode)) {
 792                         pr_warn_once("inode type changed! (ino %llx.%llx is 0%o, mds says 0%o)\n",
 793                                      ceph_vinop(inode), inode->i_mode, mode);
 794                         return -ESTALE;
 795                 }
 796
 797                 if ((S_ISCHR(mode) || S_ISBLK(mode)) && inode->i_rdev != rdev) {
 798                         pr_warn_once("dev inode rdev changed! (ino %llx.%llx is %u:%u, mds says %u:%u)\n",
 799                                      ceph_vinop(inode), MAJOR(inode->i_rdev),
 800                                      MINOR(inode->i_rdev), MAJOR(rdev),
 801                                      MINOR(rdev));
 802                         return -ESTALE;
 803                 }
 804         }
 805
 806         info_caps = le32_to_cpu(info->cap.caps);
 807
 808         /* prealloc new cap struct */
 809         if (info_caps && ceph_snap(inode) == CEPH_NOSNAP) {
 810                 new_cap = ceph_get_cap(mdsc, caps_reservation);
 811                 if (!new_cap)
 812                         return -ENOMEM;
 813         }
 814
 815         /*
 816          * prealloc xattr data, if it looks like we'll need it.  only
 817          * if len > 4 (meaning there are actually xattrs; the first 4
 818          * bytes are the xattr count).
 819          */
 820         if (iinfo->xattr_len > 4) {
 821                 xattr_blob = ceph_buffer_new(iinfo->xattr_len, GFP_NOFS);
 822                 if (!xattr_blob)
 823                         pr_err("%s ENOMEM xattr blob %d bytes\n", __func__,
 824                                iinfo->xattr_len);
 825         }
 826
 827         if (iinfo->pool_ns_len > 0)
 828                 pool_ns = ceph_find_or_create_string(iinfo->pool_ns_data,
 829                                                      iinfo->pool_ns_len);
 830
 831         if (ceph_snap(inode) != CEPH_NOSNAP && !ci->i_snapid_map)
 832                 ci->i_snapid_map = ceph_get_snapid_map(mdsc, ceph_snap(inode));
 833
 834         spin_lock(&ci->i_ceph_lock);
 835
 836         /*
 837          * provided version will be odd if inode value is projected,
 838          * even if stable.  skip the update if we have newer stable
 839          * info (ours>=theirs, e.g. due to racing mds replies), unless
 840          * we are getting projected (unstable) info (in which case the
 841          * version is odd, and we want ours>theirs).
 842          *   us   them
 843          *   2    2     skip
 844          *   3    2     skip
 845          *   3    3     update
 846          */
 847         if (ci->i_version == 0 ||
 848             ((info->cap.flags & CEPH_CAP_FLAG_AUTH) &&
 849              le64_to_cpu(info->version) > (ci->i_version & ~1)))
 850                 new_version = true;
 851
 852         /* Update change_attribute */
 853         inode_set_max_iversion_raw(inode, iinfo->change_attr);
 854
 855         __ceph_caps_issued(ci, &issued);
 856         issued |= __ceph_caps_dirty(ci);
 857         new_issued = ~issued & info_caps;
 858
 859         /* directories have fl_stripe_unit set to zero */
 860         if (le32_to_cpu(info->layout.fl_stripe_unit))
 861                 inode->i_blkbits =
 862                         fls(le32_to_cpu(info->layout.fl_stripe_unit)) - 1;
 863         else
 864                 inode->i_blkbits = CEPH_BLOCK_SHIFT;
 865
 866         __ceph_update_quota(ci, iinfo->max_bytes, iinfo->max_files);
 867
 868         if ((new_version || (new_issued & CEPH_CAP_AUTH_SHARED)) &&
 869             (issued & CEPH_CAP_AUTH_EXCL) == 0) {
 870                 inode->i_mode = mode;
 871                 inode->i_uid = make_kuid(&init_user_ns, le32_to_cpu(info->uid));
 872                 inode->i_gid = make_kgid(&init_user_ns, le32_to_cpu(info->gid));
 873                 dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode,
 874                      from_kuid(&init_user_ns, inode->i_uid),
 875                      from_kgid(&init_user_ns, inode->i_gid));
 876                 ceph_decode_timespec64(&ci->i_btime, &iinfo->btime);
 877                 ceph_decode_timespec64(&ci->i_snap_btime, &iinfo->snap_btime);
 878         }
 879
 880         if ((new_version || (new_issued & CEPH_CAP_LINK_SHARED)) &&
 881             (issued & CEPH_CAP_LINK_EXCL) == 0)
 882                 set_nlink(inode, le32_to_cpu(info->nlink));
 883
 884         if (new_version || (new_issued & CEPH_CAP_ANY_RD)) {
 885                 /* be careful with mtime, atime, size */
 886                 ceph_decode_timespec64(&atime, &info->atime);
 887                 ceph_decode_timespec64(&mtime, &info->mtime);
 888                 ceph_decode_timespec64(&ctime, &info->ctime);
 889                 ceph_fill_file_time(inode, issued,
 890                                 le32_to_cpu(info->time_warp_seq),
 891                                 &ctime, &mtime, &atime);
 892         }
 893
 894         if (new_version || (info_caps & CEPH_CAP_FILE_SHARED)) {
 895                 ci->i_files = le64_to_cpu(info->files);
 896                 ci->i_subdirs = le64_to_cpu(info->subdirs);
 897         }
 898
 899         if (new_version ||
 900             (new_issued & (CEPH_CAP_ANY_FILE_RD | CEPH_CAP_ANY_FILE_WR))) {
 901                 s64 old_pool = ci->i_layout.pool_id;
 902                 struct ceph_string *old_ns;
 903
 904                 ceph_file_layout_from_legacy(&ci->i_layout, &info->layout);
 905                 old_ns = rcu_dereference_protected(ci->i_layout.pool_ns,
 906                                         lockdep_is_held(&ci->i_ceph_lock));
 907                 rcu_assign_pointer(ci->i_layout.pool_ns, pool_ns);
 908
 909                 if (ci->i_layout.pool_id != old_pool || pool_ns != old_ns)
 910                         ci->i_ceph_flags &= ~CEPH_I_POOL_PERM;
 911
 912                 pool_ns = old_ns;
 913
 914                 queue_trunc = ceph_fill_file_size(inode, issued,
 915                                         le32_to_cpu(info->truncate_seq),
 916                                         le64_to_cpu(info->truncate_size),
 917                                         le64_to_cpu(info->size));
 918                 /* only update max_size on auth cap */
 919                 if ((info->cap.flags & CEPH_CAP_FLAG_AUTH) &&
 920                     ci->i_max_size != le64_to_cpu(info->max_size)) {
 921                         dout("max_size %lld -> %llu\n", ci->i_max_size,
 922                                         le64_to_cpu(info->max_size));
 923                         ci->i_max_size = le64_to_cpu(info->max_size);
 924                 }
 925         }
 926
 927         /* layout and rstat are not tracked by capability, update them if
 928          * the inode info is from auth mds */
 929         if (new_version || (info->cap.flags & CEPH_CAP_FLAG_AUTH)) {
 930                 if (S_ISDIR(inode->i_mode)) {
 931                         ci->i_dir_layout = iinfo->dir_layout;
 932                         ci->i_rbytes = le64_to_cpu(info->rbytes);
 933                         ci->i_rfiles = le64_to_cpu(info->rfiles);
 934                         ci->i_rsubdirs = le64_to_cpu(info->rsubdirs);
 935                         ci->i_dir_pin = iinfo->dir_pin;
 936                         ci->i_rsnaps = iinfo->rsnaps;
 937                         ceph_decode_timespec64(&ci->i_rctime, &info->rctime);
 938                 }
 939         }
 940
 941         /* xattrs */
 942         /* note that if i_xattrs.len <= 4, i_xattrs.data will still be NULL. */
 943         if ((ci->i_xattrs.version == 0 || !(issued & CEPH_CAP_XATTR_EXCL))  &&
 944             le64_to_cpu(info->xattr_version) > ci->i_xattrs.version) {
 945                 if (ci->i_xattrs.blob)
 946                         old_blob = ci->i_xattrs.blob;
 947                 ci->i_xattrs.blob = xattr_blob;
 948                 if (xattr_blob)
 949                         memcpy(ci->i_xattrs.blob->vec.iov_base,
 950                                iinfo->xattr_data, iinfo->xattr_len);
 951                 ci->i_xattrs.version = le64_to_cpu(info->xattr_version);
 952                 ceph_forget_all_cached_acls(inode);
 953                 ceph_security_invalidate_secctx(inode);
 954                 xattr_blob = NULL;
 955         }
 956
 957         /* finally update i_version */
 958         if (le64_to_cpu(info->version) > ci->i_version)
 959                 ci->i_version = le64_to_cpu(info->version);
 960
 961         inode->i_mapping->a_ops = &ceph_aops;
 962
 963         switch (inode->i_mode & S_IFMT) {
 964         case S_IFIFO:
 965         case S_IFBLK:
 966         case S_IFCHR:
 967         case S_IFSOCK:
 968                 inode->i_blkbits = PAGE_SHIFT;
 969                 init_special_inode(inode, inode->i_mode, rdev);
 970                 inode->i_op = &ceph_file_iops;
 971                 break;
 972         case S_IFREG:
 973                 inode->i_op = &ceph_file_iops;
 974                 inode->i_fop = &ceph_file_fops;
 975                 break;
 976         case S_IFLNK:
 977                 inode->i_op = &ceph_symlink_iops;
 978                 if (!ci->i_symlink) {
 979                         u32 symlen = iinfo->symlink_len;
 980                         char *sym;
 981
 982                         spin_unlock(&ci->i_ceph_lock);
 983
 984                         if (symlen != i_size_read(inode)) {
 985                                 pr_err("%s %llx.%llx BAD symlink "
 986                                         "size %lld\n", __func__,
 987                                         ceph_vinop(inode),
 988                                         i_size_read(inode));
 989                                 i_size_write(inode, symlen);
 990                                 inode->i_blocks = calc_inode_blocks(symlen);
 991                         }
 992
 993                         err = -ENOMEM;
 994                         sym = kstrndup(iinfo->symlink, symlen, GFP_NOFS);
 995                         if (!sym)
 996                                 goto out;
 997
 998                         spin_lock(&ci->i_ceph_lock);
 999                         if (!ci->i_symlink)
1000                                 ci->i_symlink = sym;
1001                         else
1002                                 kfree(sym); /* lost a race */
1003                 }
1004                 inode->i_link = ci->i_symlink;
1005                 break;
1006         case S_IFDIR:
1007                 inode->i_op = &ceph_dir_iops;
1008                 inode->i_fop = &ceph_dir_fops;
1009                 break;
1010         default:
1011                 pr_err("%s %llx.%llx BAD mode 0%o\n", __func__,
1012                        ceph_vinop(inode), inode->i_mode);
1013         }
1014
1015         /* were we issued a capability? */
1016         if (info_caps) {
1017                 if (ceph_snap(inode) == CEPH_NOSNAP) {
1018                         ceph_add_cap(inode, session,
1019                                      le64_to_cpu(info->cap.cap_id),
1020                                      info_caps,
1021                                      le32_to_cpu(info->cap.wanted),
1022                                      le32_to_cpu(info->cap.seq),
1023                                      le32_to_cpu(info->cap.mseq),
1024                                      le64_to_cpu(info->cap.realm),
1025                                      info->cap.flags, &new_cap);
1026
1027                         /* set dir completion flag? */
1028                         if (S_ISDIR(inode->i_mode) &&
1029                             ci->i_files == 0 && ci->i_subdirs == 0 &&
1030                             (info_caps & CEPH_CAP_FILE_SHARED) &&
1031                             (issued & CEPH_CAP_FILE_EXCL) == 0 &&
1032                             !__ceph_dir_is_complete(ci)) {
1033                                 dout(" marking %p complete (empty)\n", inode);
1034                                 i_size_write(inode, 0);
1035                                 __ceph_dir_set_complete(ci,
1036                                         atomic64_read(&ci->i_release_count),
1037                                         atomic64_read(&ci->i_ordered_count));
1038                         }
1039
1040                         wake = true;
1041                 } else {
1042                         dout(" %p got snap_caps %s\n", inode,
1043                              ceph_cap_string(info_caps));
1044                         ci->i_snap_caps |= info_caps;
1045                 }
1046         }
1047
1048         if (iinfo->inline_version > 0 &&
1049             iinfo->inline_version >= ci->i_inline_version) {
1050                 int cache_caps = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO;
1051                 ci->i_inline_version = iinfo->inline_version;
1052                 if (ci->i_inline_version != CEPH_INLINE_NONE &&
1053                     (locked_page || (info_caps & cache_caps)))
1054                         fill_inline = true;
1055         }
1056
1057         if (cap_fmode >= 0) {
1058                 if (!info_caps)
1059                         pr_warn("mds issued no caps on %llx.%llx\n",
1060                                 ceph_vinop(inode));
1061                 __ceph_touch_fmode(ci, mdsc, cap_fmode);
1062         }
1063
1064         spin_unlock(&ci->i_ceph_lock);
1065
1066         ceph_fscache_register_inode_cookie(inode);
1067
1068         if (fill_inline)
1069                 ceph_fill_inline_data(inode, locked_page,
1070                                       iinfo->inline_data, iinfo->inline_len);
1071
1072         if (wake)
1073                 wake_up_all(&ci->i_cap_wq);
1074
1075         /* queue truncate if we saw i_size decrease */
1076         if (queue_trunc)
1077                 ceph_queue_vmtruncate(inode);
1078
1079         /* populate frag tree */
1080         if (S_ISDIR(inode->i_mode))
1081                 ceph_fill_fragtree(inode, &info->fragtree, dirinfo);
1082
1083         /* update delegation info? */
1084         if (dirinfo)
1085                 ceph_fill_dirfrag(inode, dirinfo);
1086
1087         err = 0;
1088 out:
1089         if (new_cap)
1090                 ceph_put_cap(mdsc, new_cap);
1091         ceph_buffer_put(old_blob);
1092         ceph_buffer_put(xattr_blob);
1093         ceph_put_string(pool_ns);
1094         return err;
1095 }
1096
1097 /*
1098  * caller should hold session s_mutex and dentry->d_lock.
1099  */
1100 static void __update_dentry_lease(struct inode *dir, struct dentry *dentry,
1101                                   struct ceph_mds_reply_lease *lease,
1102                                   struct ceph_mds_session *session,
1103                                   unsigned long from_time,
1104                                   struct ceph_mds_session **old_lease_session)
1105 {
1106         struct ceph_dentry_info *di = ceph_dentry(dentry);
1107         unsigned mask = le16_to_cpu(lease->mask);
1108         long unsigned duration = le32_to_cpu(lease->duration_ms);
1109         long unsigned ttl = from_time + (duration * HZ) / 1000;
1110         long unsigned half_ttl = from_time + (duration * HZ / 2) / 1000;
1111
1112         dout("update_dentry_lease %p duration %lu ms ttl %lu\n",
1113              dentry, duration, ttl);
1114
1115         /* only track leases on regular dentries */
1116         if (ceph_snap(dir) != CEPH_NOSNAP)
1117                 return;
1118
1119         if (mask & CEPH_LEASE_PRIMARY_LINK)
1120                 di->flags |= CEPH_DENTRY_PRIMARY_LINK;
1121         else
1122                 di->flags &= ~CEPH_DENTRY_PRIMARY_LINK;
1123
1124         di->lease_shared_gen = atomic_read(&ceph_inode(dir)->i_shared_gen);
1125         if (!(mask & CEPH_LEASE_VALID)) {
1126                 __ceph_dentry_dir_lease_touch(di);
1127                 return;
1128         }
1129
1130         if (di->lease_gen == atomic_read(&session->s_cap_gen) &&
1131             time_before(ttl, di->time))
1132                 return;  /* we already have a newer lease. */
1133
1134         if (di->lease_session && di->lease_session != session) {
1135                 *old_lease_session = di->lease_session;
1136                 di->lease_session = NULL;
1137         }
1138
1139         if (!di->lease_session)
1140                 di->lease_session = ceph_get_mds_session(session);
1141         di->lease_gen = atomic_read(&session->s_cap_gen);
1142         di->lease_seq = le32_to_cpu(lease->seq);
1143         di->lease_renew_after = half_ttl;
1144         di->lease_renew_from = 0;
1145         di->time = ttl;
1146
1147         __ceph_dentry_lease_touch(di);
1148 }
1149
1150 static inline void update_dentry_lease(struct inode *dir, struct dentry *dentry,
1151                                         struct ceph_mds_reply_lease *lease,
1152                                         struct ceph_mds_session *session,
1153                                         unsigned long from_time)
1154 {
1155         struct ceph_mds_session *old_lease_session = NULL;
1156         spin_lock(&dentry->d_lock);
1157         __update_dentry_lease(dir, dentry, lease, session, from_time,
1158                               &old_lease_session);
1159         spin_unlock(&dentry->d_lock);
1160         ceph_put_mds_session(old_lease_session);
1161 }
1162
1163 /*
1164  * update dentry lease without having parent inode locked
1165  */
1166 static void update_dentry_lease_careful(struct dentry *dentry,
1167                                         struct ceph_mds_reply_lease *lease,
1168                                         struct ceph_mds_session *session,
1169                                         unsigned long from_time,
1170                                         char *dname, u32 dname_len,
1171                                         struct ceph_vino *pdvino,
1172                                         struct ceph_vino *ptvino)
1173
1174 {
1175         struct inode *dir;
1176         struct ceph_mds_session *old_lease_session = NULL;
1177
1178         spin_lock(&dentry->d_lock);
1179         /* make sure dentry's name matches target */
1180         if (dentry->d_name.len != dname_len ||
1181             memcmp(dentry->d_name.name, dname, dname_len))
1182                 goto out_unlock;
1183
1184         dir = d_inode(dentry->d_parent);
1185         /* make sure parent matches dvino */
1186         if (!ceph_ino_compare(dir, pdvino))
1187                 goto out_unlock;
1188
1189         /* make sure dentry's inode matches target. NULL ptvino means that
1190          * we expect a negative dentry */
1191         if (ptvino) {
1192                 if (d_really_is_negative(dentry))
1193                         goto out_unlock;
1194                 if (!ceph_ino_compare(d_inode(dentry), ptvino))
1195                         goto out_unlock;
1196         } else {
1197                 if (d_really_is_positive(dentry))
1198                         goto out_unlock;
1199         }
1200
1201         __update_dentry_lease(dir, dentry, lease, session,
1202                               from_time, &old_lease_session);
1203 out_unlock:
1204         spin_unlock(&dentry->d_lock);
1205         ceph_put_mds_session(old_lease_session);
1206 }
1207
1208 /*
1209  * splice a dentry to an inode.
1210  * caller must hold directory i_rwsem for this to be safe.
1211  */
1212 static int splice_dentry(struct dentry **pdn, struct inode *in)
1213 {
1214         struct dentry *dn = *pdn;
1215         struct dentry *realdn;
1216
1217         BUG_ON(d_inode(dn));
1218
1219         if (S_ISDIR(in->i_mode)) {
1220                 /* If inode is directory, d_splice_alias() below will remove
1221                  * 'realdn' from its origin parent. We need to ensure that
1222                  * origin parent's readdir cache will not reference 'realdn'
1223                  */
1224                 realdn = d_find_any_alias(in);
1225                 if (realdn) {
1226                         struct ceph_dentry_info *di = ceph_dentry(realdn);
1227                         spin_lock(&realdn->d_lock);
1228
1229                         realdn->d_op->d_prune(realdn);
1230
1231                         di->time = jiffies;
1232                         di->lease_shared_gen = 0;
1233                         di->offset = 0;
1234
1235                         spin_unlock(&realdn->d_lock);
1236                         dput(realdn);
1237                 }
1238         }
1239
1240         /* dn must be unhashed */
1241         if (!d_unhashed(dn))
1242                 d_drop(dn);
1243         realdn = d_splice_alias(in, dn);
1244         if (IS_ERR(realdn)) {
1245                 pr_err("splice_dentry error %ld %p inode %p ino %llx.%llx\n",
1246                        PTR_ERR(realdn), dn, in, ceph_vinop(in));
1247                 return PTR_ERR(realdn);
1248         }
1249
1250         if (realdn) {
1251                 dout("dn %p (%d) spliced with %p (%d) "
1252                      "inode %p ino %llx.%llx\n",
1253                      dn, d_count(dn),
1254                      realdn, d_count(realdn),
1255                      d_inode(realdn), ceph_vinop(d_inode(realdn)));
1256                 dput(dn);
1257                 *pdn = realdn;
1258         } else {
1259                 BUG_ON(!ceph_dentry(dn));
1260                 dout("dn %p attached to %p ino %llx.%llx\n",
1261                      dn, d_inode(dn), ceph_vinop(d_inode(dn)));
1262         }
1263         return 0;
1264 }
1265
1266 /*
1267  * Incorporate results into the local cache.  This is either just
1268  * one inode, or a directory, dentry, and possibly linked-to inode (e.g.,
1269  * after a lookup).
1270  *
1271  * A reply may contain
1272  *         a directory inode along with a dentry.
1273  *  and/or a target inode
1274  *
1275  * Called with snap_rwsem (read).
1276  */
1277 int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req)
1278 {
1279         struct ceph_mds_session *session = req->r_session;
1280         struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1281         struct inode *in = NULL;
1282         struct ceph_vino tvino, dvino;
1283         struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
1284         int err = 0;
1285
1286         dout("fill_trace %p is_dentry %d is_target %d\n", req,
1287              rinfo->head->is_dentry, rinfo->head->is_target);
1288
1289         if (!rinfo->head->is_target && !rinfo->head->is_dentry) {
1290                 dout("fill_trace reply is empty!\n");
1291                 if (rinfo->head->result == 0 && req->r_parent)
1292                         ceph_invalidate_dir_request(req);
1293                 return 0;
1294         }
1295
1296         if (rinfo->head->is_dentry) {
1297                 struct inode *dir = req->r_parent;
1298
1299                 if (dir) {
1300                         err = ceph_fill_inode(dir, NULL, &rinfo->diri,
1301                                               rinfo->dirfrag, session, -1,
1302                                               &req->r_caps_reservation);
1303                         if (err < 0)
1304                                 goto done;
1305                 } else {
1306                         WARN_ON_ONCE(1);
1307                 }
1308
1309                 if (dir && req->r_op == CEPH_MDS_OP_LOOKUPNAME &&
1310                     test_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags) &&
1311                     !test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
1312                         struct qstr dname;
1313                         struct dentry *dn, *parent;
1314
1315                         BUG_ON(!rinfo->head->is_target);
1316                         BUG_ON(req->r_dentry);
1317
1318                         parent = d_find_any_alias(dir);
1319                         BUG_ON(!parent);
1320
1321                         dname.name = rinfo->dname;
1322                         dname.len = rinfo->dname_len;
1323                         dname.hash = full_name_hash(parent, dname.name, dname.len);
1324                         tvino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1325                         tvino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1326 retry_lookup:
1327                         dn = d_lookup(parent, &dname);
1328                         dout("d_lookup on parent=%p name=%.*s got %p\n",
1329                              parent, dname.len, dname.name, dn);
1330
1331                         if (!dn) {
1332                                 dn = d_alloc(parent, &dname);
1333                                 dout("d_alloc %p '%.*s' = %p\n", parent,
1334                                      dname.len, dname.name, dn);
1335                                 if (!dn) {
1336                                         dput(parent);
1337                                         err = -ENOMEM;
1338                                         goto done;
1339                                 }
1340                                 err = 0;
1341                         } else if (d_really_is_positive(dn) &&
1342                                    (ceph_ino(d_inode(dn)) != tvino.ino ||
1343                                     ceph_snap(d_inode(dn)) != tvino.snap)) {
1344                                 dout(" dn %p points to wrong inode %p\n",
1345                                      dn, d_inode(dn));
1346                                 ceph_dir_clear_ordered(dir);
1347                                 d_delete(dn);
1348                                 dput(dn);
1349                                 goto retry_lookup;
1350                         }
1351
1352                         req->r_dentry = dn;
1353                         dput(parent);
1354                 }
1355         }
1356
1357         if (rinfo->head->is_target) {
1358                 /* Should be filled in by handle_reply */
1359                 BUG_ON(!req->r_target_inode);
1360
1361                 in = req->r_target_inode;
1362                 err = ceph_fill_inode(in, req->r_locked_page, &rinfo->targeti,
1363                                 NULL, session,
1364                                 (!test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags) &&
1365                                  !test_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags) &&
1366                                  rinfo->head->result == 0) ?  req->r_fmode : -1,
1367                                 &req->r_caps_reservation);
1368                 if (err < 0) {
1369                         pr_err("ceph_fill_inode badness %p %llx.%llx\n",
1370                                 in, ceph_vinop(in));
1371                         req->r_target_inode = NULL;
1372                         if (in->i_state & I_NEW)
1373                                 discard_new_inode(in);
1374                         else
1375                                 iput(in);
1376                         goto done;
1377                 }
1378                 if (in->i_state & I_NEW)
1379                         unlock_new_inode(in);
1380         }
1381
1382         /*
1383          * ignore null lease/binding on snapdir ENOENT, or else we
1384          * will have trouble splicing in the virtual snapdir later
1385          */
1386         if (rinfo->head->is_dentry &&
1387             !test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags) &&
1388             test_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags) &&
1389             (rinfo->head->is_target || strncmp(req->r_dentry->d_name.name,
1390                                                fsc->mount_options->snapdir_name,
1391                                                req->r_dentry->d_name.len))) {
1392                 /*
1393                  * lookup link rename   : null -> possibly existing inode
1394                  * mknod symlink mkdir  : null -> new inode
1395                  * unlink               : linked -> null
1396                  */
1397                 struct inode *dir = req->r_parent;
1398                 struct dentry *dn = req->r_dentry;
1399                 bool have_dir_cap, have_lease;
1400
1401                 BUG_ON(!dn);
1402                 BUG_ON(!dir);
1403                 BUG_ON(d_inode(dn->d_parent) != dir);
1404
1405                 dvino.ino = le64_to_cpu(rinfo->diri.in->ino);
1406                 dvino.snap = le64_to_cpu(rinfo->diri.in->snapid);
1407
1408                 BUG_ON(ceph_ino(dir) != dvino.ino);
1409                 BUG_ON(ceph_snap(dir) != dvino.snap);
1410
1411                 /* do we have a lease on the whole dir? */
1412                 have_dir_cap =
1413                         (le32_to_cpu(rinfo->diri.in->cap.caps) &
1414                          CEPH_CAP_FILE_SHARED);
1415
1416                 /* do we have a dn lease? */
1417                 have_lease = have_dir_cap ||
1418                         le32_to_cpu(rinfo->dlease->duration_ms);
1419                 if (!have_lease)
1420                         dout("fill_trace  no dentry lease or dir cap\n");
1421
1422                 /* rename? */
1423                 if (req->r_old_dentry && req->r_op == CEPH_MDS_OP_RENAME) {
1424                         struct inode *olddir = req->r_old_dentry_dir;
1425                         BUG_ON(!olddir);
1426
1427                         dout(" src %p '%pd' dst %p '%pd'\n",
1428                              req->r_old_dentry,
1429                              req->r_old_dentry,
1430                              dn, dn);
1431                         dout("fill_trace doing d_move %p -> %p\n",
1432                              req->r_old_dentry, dn);
1433
1434                         /* d_move screws up sibling dentries' offsets */
1435                         ceph_dir_clear_ordered(dir);
1436                         ceph_dir_clear_ordered(olddir);
1437
1438                         d_move(req->r_old_dentry, dn);
1439                         dout(" src %p '%pd' dst %p '%pd'\n",
1440                              req->r_old_dentry,
1441                              req->r_old_dentry,
1442                              dn, dn);
1443
1444                         /* ensure target dentry is invalidated, despite
1445                            rehashing bug in vfs_rename_dir */
1446                         ceph_invalidate_dentry_lease(dn);
1447
1448                         dout("dn %p gets new offset %lld\n", req->r_old_dentry,
1449                              ceph_dentry(req->r_old_dentry)->offset);
1450
1451                         /* swap r_dentry and r_old_dentry in case that
1452                          * splice_dentry() gets called later. This is safe
1453                          * because no other place will use them */
1454                         req->r_dentry = req->r_old_dentry;
1455                         req->r_old_dentry = dn;
1456                         dn = req->r_dentry;
1457                 }
1458
1459                 /* null dentry? */
1460                 if (!rinfo->head->is_target) {
1461                         dout("fill_trace null dentry\n");
1462                         if (d_really_is_positive(dn)) {
1463                                 dout("d_delete %p\n", dn);
1464                                 ceph_dir_clear_ordered(dir);
1465                                 d_delete(dn);
1466                         } else if (have_lease) {
1467                                 if (d_unhashed(dn))
1468                                         d_add(dn, NULL);
1469                                 update_dentry_lease(dir, dn,
1470                                                     rinfo->dlease, session,
1471                                                     req->r_request_started);
1472                         }
1473                         goto done;
1474                 }
1475
1476                 /* attach proper inode */
1477                 if (d_really_is_negative(dn)) {
1478                         ceph_dir_clear_ordered(dir);
1479                         ihold(in);
1480                         err = splice_dentry(&req->r_dentry, in);
1481                         if (err < 0)
1482                                 goto done;
1483                         dn = req->r_dentry;  /* may have spliced */
1484                 } else if (d_really_is_positive(dn) && d_inode(dn) != in) {
1485                         dout(" %p links to %p %llx.%llx, not %llx.%llx\n",
1486                              dn, d_inode(dn), ceph_vinop(d_inode(dn)),
1487                              ceph_vinop(in));
1488                         d_invalidate(dn);
1489                         have_lease = false;
1490                 }
1491
1492                 if (have_lease) {
1493                         update_dentry_lease(dir, dn,
1494                                             rinfo->dlease, session,
1495                                             req->r_request_started);
1496                 }
1497                 dout(" final dn %p\n", dn);
1498         } else if ((req->r_op == CEPH_MDS_OP_LOOKUPSNAP ||
1499                     req->r_op == CEPH_MDS_OP_MKSNAP) &&
1500                    test_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags) &&
1501                    !test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
1502                 struct inode *dir = req->r_parent;
1503
1504                 /* fill out a snapdir LOOKUPSNAP dentry */
1505                 BUG_ON(!dir);
1506                 BUG_ON(ceph_snap(dir) != CEPH_SNAPDIR);
1507                 BUG_ON(!req->r_dentry);
1508                 dout(" linking snapped dir %p to dn %p\n", in, req->r_dentry);
1509                 ceph_dir_clear_ordered(dir);
1510                 ihold(in);
1511                 err = splice_dentry(&req->r_dentry, in);
1512                 if (err < 0)
1513                         goto done;
1514         } else if (rinfo->head->is_dentry && req->r_dentry) {
1515                 /* parent inode is not locked, be carefull */
1516                 struct ceph_vino *ptvino = NULL;
1517                 dvino.ino = le64_to_cpu(rinfo->diri.in->ino);
1518                 dvino.snap = le64_to_cpu(rinfo->diri.in->snapid);
1519                 if (rinfo->head->is_target) {
1520                         tvino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1521                         tvino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1522                         ptvino = &tvino;
1523                 }
1524                 update_dentry_lease_careful(req->r_dentry, rinfo->dlease,
1525                                             session, req->r_request_started,
1526                                             rinfo->dname, rinfo->dname_len,
1527                                             &dvino, ptvino);
1528         }
1529 done:
1530         dout("fill_trace done err=%d\n", err);
1531         return err;
1532 }
1533
1534 /*
1535  * Prepopulate our cache with readdir results, leases, etc.
1536  */
1537 static int readdir_prepopulate_inodes_only(struct ceph_mds_request *req,
1538                                            struct ceph_mds_session *session)
1539 {
1540         struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1541         int i, err = 0;
1542
1543         for (i = 0; i < rinfo->dir_nr; i++) {
1544                 struct ceph_mds_reply_dir_entry *rde = rinfo->dir_entries + i;
1545                 struct ceph_vino vino;
1546                 struct inode *in;
1547                 int rc;
1548
1549                 vino.ino = le64_to_cpu(rde->inode.in->ino);
1550                 vino.snap = le64_to_cpu(rde->inode.in->snapid);
1551
1552                 in = ceph_get_inode(req->r_dentry->d_sb, vino);
1553                 if (IS_ERR(in)) {
1554                         err = PTR_ERR(in);
1555                         dout("new_inode badness got %d\n", err);
1556                         continue;
1557                 }
1558                 rc = ceph_fill_inode(in, NULL, &rde->inode, NULL, session,
1559                                      -1, &req->r_caps_reservation);
1560                 if (rc < 0) {
1561                         pr_err("ceph_fill_inode badness on %p got %d\n",
1562                                in, rc);
1563                         err = rc;
1564                         if (in->i_state & I_NEW) {
1565                                 ihold(in);
1566                                 discard_new_inode(in);
1567                         }
1568                 } else if (in->i_state & I_NEW) {
1569                         unlock_new_inode(in);
1570                 }
1571
1572                 iput(in);
1573         }
1574
1575         return err;
1576 }
1577
1578 void ceph_readdir_cache_release(struct ceph_readdir_cache_control *ctl)
1579 {
1580         if (ctl->page) {
1581                 kunmap(ctl->page);
1582                 put_page(ctl->page);
1583                 ctl->page = NULL;
1584         }
1585 }
1586
1587 static int fill_readdir_cache(struct inode *dir, struct dentry *dn,
1588                               struct ceph_readdir_cache_control *ctl,
1589                               struct ceph_mds_request *req)
1590 {
1591         struct ceph_inode_info *ci = ceph_inode(dir);
1592         unsigned nsize = PAGE_SIZE / sizeof(struct dentry*);
1593         unsigned idx = ctl->index % nsize;
1594         pgoff_t pgoff = ctl->index / nsize;
1595
1596         if (!ctl->page || pgoff != page_index(ctl->page)) {
1597                 ceph_readdir_cache_release(ctl);
1598                 if (idx == 0)
1599                         ctl->page = grab_cache_page(&dir->i_data, pgoff);
1600                 else
1601                         ctl->page = find_lock_page(&dir->i_data, pgoff);
1602                 if (!ctl->page) {
1603                         ctl->index = -1;
1604                         return idx == 0 ? -ENOMEM : 0;
1605                 }
1606                 /* reading/filling the cache are serialized by
1607                  * i_rwsem, no need to use page lock */
1608                 unlock_page(ctl->page);
1609                 ctl->dentries = kmap(ctl->page);
1610                 if (idx == 0)
1611                         memset(ctl->dentries, 0, PAGE_SIZE);
1612         }
1613
1614         if (req->r_dir_release_cnt == atomic64_read(&ci->i_release_count) &&
1615             req->r_dir_ordered_cnt == atomic64_read(&ci->i_ordered_count)) {
1616                 dout("readdir cache dn %p idx %d\n", dn, ctl->index);
1617                 ctl->dentries[idx] = dn;
1618                 ctl->index++;
1619         } else {
1620                 dout("disable readdir cache\n");
1621                 ctl->index = -1;
1622         }
1623         return 0;
1624 }
1625
1626 int ceph_readdir_prepopulate(struct ceph_mds_request *req,
1627                              struct ceph_mds_session *session)
1628 {
1629         struct dentry *parent = req->r_dentry;
1630         struct ceph_inode_info *ci = ceph_inode(d_inode(parent));
1631         struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1632         struct qstr dname;
1633         struct dentry *dn;
1634         struct inode *in;
1635         int err = 0, skipped = 0, ret, i;
1636         u32 frag = le32_to_cpu(req->r_args.readdir.frag);
1637         u32 last_hash = 0;
1638         u32 fpos_offset;
1639         struct ceph_readdir_cache_control cache_ctl = {};
1640
1641         if (test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags))
1642                 return readdir_prepopulate_inodes_only(req, session);
1643
1644         if (rinfo->hash_order) {
1645                 if (req->r_path2) {
1646                         last_hash = ceph_str_hash(ci->i_dir_layout.dl_dir_hash,
1647                                                   req->r_path2,
1648                                                   strlen(req->r_path2));
1649                         last_hash = ceph_frag_value(last_hash);
1650                 } else if (rinfo->offset_hash) {
1651                         /* mds understands offset_hash */
1652                         WARN_ON_ONCE(req->r_readdir_offset != 2);
1653                         last_hash = le32_to_cpu(req->r_args.readdir.offset_hash);
1654                 }
1655         }
1656
1657         if (rinfo->dir_dir &&
1658             le32_to_cpu(rinfo->dir_dir->frag) != frag) {
1659                 dout("readdir_prepopulate got new frag %x -> %x\n",
1660                      frag, le32_to_cpu(rinfo->dir_dir->frag));
1661                 frag = le32_to_cpu(rinfo->dir_dir->frag);
1662                 if (!rinfo->hash_order)
1663                         req->r_readdir_offset = 2;
1664         }
1665
1666         if (le32_to_cpu(rinfo->head->op) == CEPH_MDS_OP_LSSNAP) {
1667                 dout("readdir_prepopulate %d items under SNAPDIR dn %p\n",
1668                      rinfo->dir_nr, parent);
1669         } else {
1670                 dout("readdir_prepopulate %d items under dn %p\n",
1671                      rinfo->dir_nr, parent);
1672                 if (rinfo->dir_dir)
1673                         ceph_fill_dirfrag(d_inode(parent), rinfo->dir_dir);
1674
1675                 if (ceph_frag_is_leftmost(frag) &&
1676                     req->r_readdir_offset == 2 &&
1677                     !(rinfo->hash_order && last_hash)) {
1678                         /* note dir version at start of readdir so we can
1679                          * tell if any dentries get dropped */
1680                         req->r_dir_release_cnt =
1681                                 atomic64_read(&ci->i_release_count);
1682                         req->r_dir_ordered_cnt =
1683                                 atomic64_read(&ci->i_ordered_count);
1684                         req->r_readdir_cache_idx = 0;
1685                 }
1686         }
1687
1688         cache_ctl.index = req->r_readdir_cache_idx;
1689         fpos_offset = req->r_readdir_offset;
1690
1691         /* FIXME: release caps/leases if error occurs */
1692         for (i = 0; i < rinfo->dir_nr; i++) {
1693                 struct ceph_mds_reply_dir_entry *rde = rinfo->dir_entries + i;
1694                 struct ceph_vino tvino;
1695
1696                 dname.name = rde->name;
1697                 dname.len = rde->name_len;
1698                 dname.hash = full_name_hash(parent, dname.name, dname.len);
1699
1700                 tvino.ino = le64_to_cpu(rde->inode.in->ino);
1701                 tvino.snap = le64_to_cpu(rde->inode.in->snapid);
1702
1703                 if (rinfo->hash_order) {
1704                         u32 hash = ceph_str_hash(ci->i_dir_layout.dl_dir_hash,
1705                                                  rde->name, rde->name_len);
1706                         hash = ceph_frag_value(hash);
1707                         if (hash != last_hash)
1708                                 fpos_offset = 2;
1709                         last_hash = hash;
1710                         rde->offset = ceph_make_fpos(hash, fpos_offset++, true);
1711                 } else {
1712                         rde->offset = ceph_make_fpos(frag, fpos_offset++, false);
1713                 }
1714
1715 retry_lookup:
1716                 dn = d_lookup(parent, &dname);
1717                 dout("d_lookup on parent=%p name=%.*s got %p\n",
1718                      parent, dname.len, dname.name, dn);
1719
1720                 if (!dn) {
1721                         dn = d_alloc(parent, &dname);
1722                         dout("d_alloc %p '%.*s' = %p\n", parent,
1723                              dname.len, dname.name, dn);
1724                         if (!dn) {
1725                                 dout("d_alloc badness\n");
1726                                 err = -ENOMEM;
1727                                 goto out;
1728                         }
1729                 } else if (d_really_is_positive(dn) &&
1730                            (ceph_ino(d_inode(dn)) != tvino.ino ||
1731                             ceph_snap(d_inode(dn)) != tvino.snap)) {
1732                         struct ceph_dentry_info *di = ceph_dentry(dn);
1733                         dout(" dn %p points to wrong inode %p\n",
1734                              dn, d_inode(dn));
1735
1736                         spin_lock(&dn->d_lock);
1737                         if (di->offset > 0 &&
1738                             di->lease_shared_gen ==
1739                             atomic_read(&ci->i_shared_gen)) {
1740                                 __ceph_dir_clear_ordered(ci);
1741                                 di->offset = 0;
1742                         }
1743                         spin_unlock(&dn->d_lock);
1744
1745                         d_delete(dn);
1746                         dput(dn);
1747                         goto retry_lookup;
1748                 }
1749
1750                 /* inode */
1751                 if (d_really_is_positive(dn)) {
1752                         in = d_inode(dn);
1753                 } else {
1754                         in = ceph_get_inode(parent->d_sb, tvino);
1755                         if (IS_ERR(in)) {
1756                                 dout("new_inode badness\n");
1757                                 d_drop(dn);
1758                                 dput(dn);
1759                                 err = PTR_ERR(in);
1760                                 goto out;
1761                         }
1762                 }
1763
1764                 ret = ceph_fill_inode(in, NULL, &rde->inode, NULL, session,
1765                                       -1, &req->r_caps_reservation);
1766                 if (ret < 0) {
1767                         pr_err("ceph_fill_inode badness on %p\n", in);
1768                         if (d_really_is_negative(dn)) {
1769                                 if (in->i_state & I_NEW) {
1770                                         ihold(in);
1771                                         discard_new_inode(in);
1772                                 }
1773                                 iput(in);
1774                         }
1775                         d_drop(dn);
1776                         err = ret;
1777                         goto next_item;
1778                 }
1779                 if (in->i_state & I_NEW)
1780                         unlock_new_inode(in);
1781
1782                 if (d_really_is_negative(dn)) {
1783                         if (ceph_security_xattr_deadlock(in)) {
1784                                 dout(" skip splicing dn %p to inode %p"
1785                                      " (security xattr deadlock)\n", dn, in);
1786                                 iput(in);
1787                                 skipped++;
1788                                 goto next_item;
1789                         }
1790
1791                         err = splice_dentry(&dn, in);
1792                         if (err < 0)
1793                                 goto next_item;
1794                 }
1795
1796                 ceph_dentry(dn)->offset = rde->offset;
1797
1798                 update_dentry_lease(d_inode(parent), dn,
1799                                     rde->lease, req->r_session,
1800                                     req->r_request_started);
1801
1802                 if (err == 0 && skipped == 0 && cache_ctl.index >= 0) {
1803                         ret = fill_readdir_cache(d_inode(parent), dn,
1804                                                  &cache_ctl, req);
1805                         if (ret < 0)
1806                                 err = ret;
1807                 }
1808 next_item:
1809                 dput(dn);
1810         }
1811 out:
1812         if (err == 0 && skipped == 0) {
1813                 set_bit(CEPH_MDS_R_DID_PREPOPULATE, &req->r_req_flags);
1814                 req->r_readdir_cache_idx = cache_ctl.index;
1815         }
1816         ceph_readdir_cache_release(&cache_ctl);
1817         dout("readdir_prepopulate done\n");
1818         return err;
1819 }
1820
1821 bool ceph_inode_set_size(struct inode *inode, loff_t size)
1822 {
1823         struct ceph_inode_info *ci = ceph_inode(inode);
1824         bool ret;
1825
1826         spin_lock(&ci->i_ceph_lock);
1827         dout("set_size %p %llu -> %llu\n", inode, i_size_read(inode), size);
1828         i_size_write(inode, size);
1829         ceph_fscache_update(inode);
1830         inode->i_blocks = calc_inode_blocks(size);
1831
1832         ret = __ceph_should_report_size(ci);
1833
1834         spin_unlock(&ci->i_ceph_lock);
1835
1836         return ret;
1837 }
1838
1839 void ceph_queue_inode_work(struct inode *inode, int work_bit)
1840 {
1841         struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1842         struct ceph_inode_info *ci = ceph_inode(inode);
1843         set_bit(work_bit, &ci->i_work_mask);
1844
1845         ihold(inode);
1846         if (queue_work(fsc->inode_wq, &ci->i_work)) {
1847                 dout("queue_inode_work %p, mask=%lx\n", inode, ci->i_work_mask);
1848         } else {
1849                 dout("queue_inode_work %p already queued, mask=%lx\n",
1850                      inode, ci->i_work_mask);
1851                 iput(inode);
1852         }
1853 }
1854
1855 static void ceph_do_invalidate_pages(struct inode *inode)
1856 {
1857         struct ceph_inode_info *ci = ceph_inode(inode);
1858         u32 orig_gen;
1859         int check = 0;
1860
1861         ceph_fscache_invalidate(inode, false);
1862
1863         mutex_lock(&ci->i_truncate_mutex);
1864
1865         if (ceph_inode_is_shutdown(inode)) {
1866                 pr_warn_ratelimited("%s: inode %llx.%llx is shut down\n",
1867                                     __func__, ceph_vinop(inode));
1868                 mapping_set_error(inode->i_mapping, -EIO);
1869                 truncate_pagecache(inode, 0);
1870                 mutex_unlock(&ci->i_truncate_mutex);
1871                 goto out;
1872         }
1873
1874         spin_lock(&ci->i_ceph_lock);
1875         dout("invalidate_pages %p gen %d revoking %d\n", inode,
1876              ci->i_rdcache_gen, ci->i_rdcache_revoking);
1877         if (ci->i_rdcache_revoking != ci->i_rdcache_gen) {
1878                 if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE))
1879                         check = 1;
1880                 spin_unlock(&ci->i_ceph_lock);
1881                 mutex_unlock(&ci->i_truncate_mutex);
1882                 goto out;
1883         }
1884         orig_gen = ci->i_rdcache_gen;
1885         spin_unlock(&ci->i_ceph_lock);
1886
1887         ceph_fscache_invalidate(inode, false);
1888         if (invalidate_inode_pages2(inode->i_mapping) < 0) {
1889                 pr_err("invalidate_inode_pages2 %llx.%llx failed\n",
1890                        ceph_vinop(inode));
1891         }
1892
1893         spin_lock(&ci->i_ceph_lock);
1894         if (orig_gen == ci->i_rdcache_gen &&
1895             orig_gen == ci->i_rdcache_revoking) {
1896                 dout("invalidate_pages %p gen %d successful\n", inode,
1897                      ci->i_rdcache_gen);
1898                 ci->i_rdcache_revoking--;
1899                 check = 1;
1900         } else {
1901                 dout("invalidate_pages %p gen %d raced, now %d revoking %d\n",
1902                      inode, orig_gen, ci->i_rdcache_gen,
1903                      ci->i_rdcache_revoking);
1904                 if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE))
1905                         check = 1;
1906         }
1907         spin_unlock(&ci->i_ceph_lock);
1908         mutex_unlock(&ci->i_truncate_mutex);
1909 out:
1910         if (check)
1911                 ceph_check_caps(ci, 0, NULL);
1912 }
1913
1914 /*
1915  * Make sure any pending truncation is applied before doing anything
1916  * that may depend on it.
1917  */
1918 void __ceph_do_pending_vmtruncate(struct inode *inode)
1919 {
1920         struct ceph_inode_info *ci = ceph_inode(inode);
1921         u64 to;
1922         int wrbuffer_refs, finish = 0;
1923
1924         mutex_lock(&ci->i_truncate_mutex);
1925 retry:
1926         spin_lock(&ci->i_ceph_lock);
1927         if (ci->i_truncate_pending == 0) {
1928                 dout("__do_pending_vmtruncate %p none pending\n", inode);
1929                 spin_unlock(&ci->i_ceph_lock);
1930                 mutex_unlock(&ci->i_truncate_mutex);
1931                 return;
1932         }
1933
1934         /*
1935          * make sure any dirty snapped pages are flushed before we
1936          * possibly truncate them.. so write AND block!
1937          */
1938         if (ci->i_wrbuffer_ref_head < ci->i_wrbuffer_ref) {
1939                 spin_unlock(&ci->i_ceph_lock);
1940                 dout("__do_pending_vmtruncate %p flushing snaps first\n",
1941                      inode);
1942                 filemap_write_and_wait_range(&inode->i_data, 0,
1943                                              inode->i_sb->s_maxbytes);
1944                 goto retry;
1945         }
1946
1947         /* there should be no reader or writer */
1948         WARN_ON_ONCE(ci->i_rd_ref || ci->i_wr_ref);
1949
1950         to = ci->i_truncate_size;
1951         wrbuffer_refs = ci->i_wrbuffer_ref;
1952         dout("__do_pending_vmtruncate %p (%d) to %lld\n", inode,
1953              ci->i_truncate_pending, to);
1954         spin_unlock(&ci->i_ceph_lock);
1955
1956         ceph_fscache_resize(inode, to);
1957         truncate_pagecache(inode, to);
1958
1959         spin_lock(&ci->i_ceph_lock);
1960         if (to == ci->i_truncate_size) {
1961                 ci->i_truncate_pending = 0;
1962                 finish = 1;
1963         }
1964         spin_unlock(&ci->i_ceph_lock);
1965         if (!finish)
1966                 goto retry;
1967
1968         mutex_unlock(&ci->i_truncate_mutex);
1969
1970         if (wrbuffer_refs == 0)
1971                 ceph_check_caps(ci, 0, NULL);
1972
1973         wake_up_all(&ci->i_cap_wq);
1974 }
1975
1976 static void ceph_inode_work(struct work_struct *work)
1977 {
1978         struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1979                                                  i_work);
1980         struct inode *inode = &ci->vfs_inode;
1981
1982         if (test_and_clear_bit(CEPH_I_WORK_WRITEBACK, &ci->i_work_mask)) {
1983                 dout("writeback %p\n", inode);
1984                 filemap_fdatawrite(&inode->i_data);
1985         }
1986         if (test_and_clear_bit(CEPH_I_WORK_INVALIDATE_PAGES, &ci->i_work_mask))
1987                 ceph_do_invalidate_pages(inode);
1988
1989         if (test_and_clear_bit(CEPH_I_WORK_VMTRUNCATE, &ci->i_work_mask))
1990                 __ceph_do_pending_vmtruncate(inode);
1991
1992         if (test_and_clear_bit(CEPH_I_WORK_CHECK_CAPS, &ci->i_work_mask))
1993                 ceph_check_caps(ci, 0, NULL);
1994
1995         if (test_and_clear_bit(CEPH_I_WORK_FLUSH_SNAPS, &ci->i_work_mask))
1996                 ceph_flush_snaps(ci, NULL);
1997
1998         iput(inode);
1999 }
2000
2001 /*
2002  * symlinks
2003  */
2004 static const struct inode_operations ceph_symlink_iops = {
2005         .get_link = simple_get_link,
2006         .setattr = ceph_setattr,
2007         .getattr = ceph_getattr,
2008         .listxattr = ceph_listxattr,
2009 };
2010
2011 int __ceph_setattr(struct inode *inode, struct iattr *attr)
2012 {
2013         struct ceph_inode_info *ci = ceph_inode(inode);
2014         unsigned int ia_valid = attr->ia_valid;
2015         struct ceph_mds_request *req;
2016         struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
2017         struct ceph_cap_flush *prealloc_cf;
2018         int issued;
2019         int release = 0, dirtied = 0;
2020         int mask = 0;
2021         int err = 0;
2022         int inode_dirty_flags = 0;
2023         bool lock_snap_rwsem = false;
2024
2025         prealloc_cf = ceph_alloc_cap_flush();
2026         if (!prealloc_cf)
2027                 return -ENOMEM;
2028
2029         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETATTR,
2030                                        USE_AUTH_MDS);
2031         if (IS_ERR(req)) {
2032                 ceph_free_cap_flush(prealloc_cf);
2033                 return PTR_ERR(req);
2034         }
2035
2036         spin_lock(&ci->i_ceph_lock);
2037         issued = __ceph_caps_issued(ci, NULL);
2038
2039         if (!ci->i_head_snapc &&
2040             (issued & (CEPH_CAP_ANY_EXCL | CEPH_CAP_FILE_WR))) {
2041                 lock_snap_rwsem = true;
2042                 if (!down_read_trylock(&mdsc->snap_rwsem)) {
2043                         spin_unlock(&ci->i_ceph_lock);
2044                         down_read(&mdsc->snap_rwsem);
2045                         spin_lock(&ci->i_ceph_lock);
2046                         issued = __ceph_caps_issued(ci, NULL);
2047                 }
2048         }
2049
2050         dout("setattr %p issued %s\n", inode, ceph_cap_string(issued));
2051
2052         if (ia_valid & ATTR_UID) {
2053                 dout("setattr %p uid %d -> %d\n", inode,
2054                      from_kuid(&init_user_ns, inode->i_uid),
2055                      from_kuid(&init_user_ns, attr->ia_uid));
2056                 if (issued & CEPH_CAP_AUTH_EXCL) {
2057                         inode->i_uid = attr->ia_uid;
2058                         dirtied |= CEPH_CAP_AUTH_EXCL;
2059                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
2060                            !uid_eq(attr->ia_uid, inode->i_uid)) {
2061                         req->r_args.setattr.uid = cpu_to_le32(
2062                                 from_kuid(&init_user_ns, attr->ia_uid));
2063                         mask |= CEPH_SETATTR_UID;
2064                         release |= CEPH_CAP_AUTH_SHARED;
2065                 }
2066         }
2067         if (ia_valid & ATTR_GID) {
2068                 dout("setattr %p gid %d -> %d\n", inode,
2069                      from_kgid(&init_user_ns, inode->i_gid),
2070                      from_kgid(&init_user_ns, attr->ia_gid));
2071                 if (issued & CEPH_CAP_AUTH_EXCL) {
2072                         inode->i_gid = attr->ia_gid;
2073                         dirtied |= CEPH_CAP_AUTH_EXCL;
2074                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
2075                            !gid_eq(attr->ia_gid, inode->i_gid)) {
2076                         req->r_args.setattr.gid = cpu_to_le32(
2077                                 from_kgid(&init_user_ns, attr->ia_gid));
2078                         mask |= CEPH_SETATTR_GID;
2079                         release |= CEPH_CAP_AUTH_SHARED;
2080                 }
2081         }
2082         if (ia_valid & ATTR_MODE) {
2083                 dout("setattr %p mode 0%o -> 0%o\n", inode, inode->i_mode,
2084                      attr->ia_mode);
2085                 if (issued & CEPH_CAP_AUTH_EXCL) {
2086                         inode->i_mode = attr->ia_mode;
2087                         dirtied |= CEPH_CAP_AUTH_EXCL;
2088                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
2089                            attr->ia_mode != inode->i_mode) {
2090                         inode->i_mode = attr->ia_mode;
2091                         req->r_args.setattr.mode = cpu_to_le32(attr->ia_mode);
2092                         mask |= CEPH_SETATTR_MODE;
2093                         release |= CEPH_CAP_AUTH_SHARED;
2094                 }
2095         }
2096
2097         if (ia_valid & ATTR_ATIME) {
2098                 dout("setattr %p atime %lld.%ld -> %lld.%ld\n", inode,
2099                      inode->i_atime.tv_sec, inode->i_atime.tv_nsec,
2100                      attr->ia_atime.tv_sec, attr->ia_atime.tv_nsec);
2101                 if (issued & CEPH_CAP_FILE_EXCL) {
2102                         ci->i_time_warp_seq++;
2103                         inode->i_atime = attr->ia_atime;
2104                         dirtied |= CEPH_CAP_FILE_EXCL;
2105                 } else if ((issued & CEPH_CAP_FILE_WR) &&
2106                            timespec64_compare(&inode->i_atime,
2107                                             &attr->ia_atime) < 0) {
2108                         inode->i_atime = attr->ia_atime;
2109                         dirtied |= CEPH_CAP_FILE_WR;
2110                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
2111                            !timespec64_equal(&inode->i_atime, &attr->ia_atime)) {
2112                         ceph_encode_timespec64(&req->r_args.setattr.atime,
2113                                                &attr->ia_atime);
2114                         mask |= CEPH_SETATTR_ATIME;
2115                         release |= CEPH_CAP_FILE_SHARED |
2116                                    CEPH_CAP_FILE_RD | CEPH_CAP_FILE_WR;
2117                 }
2118         }
2119         if (ia_valid & ATTR_SIZE) {
2120                 loff_t isize = i_size_read(inode);
2121
2122                 dout("setattr %p size %lld -> %lld\n", inode, isize, attr->ia_size);
2123                 if ((issued & CEPH_CAP_FILE_EXCL) && attr->ia_size >= isize) {
2124                         if (attr->ia_size > isize) {
2125                                 i_size_write(inode, attr->ia_size);
2126                                 inode->i_blocks = calc_inode_blocks(attr->ia_size);
2127                                 ci->i_reported_size = attr->ia_size;
2128                                 dirtied |= CEPH_CAP_FILE_EXCL;
2129                                 ia_valid |= ATTR_MTIME;
2130                         }
2131                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
2132                            attr->ia_size != isize) {
2133                         req->r_args.setattr.size = cpu_to_le64(attr->ia_size);
2134                         req->r_args.setattr.old_size = cpu_to_le64(isize);
2135                         mask |= CEPH_SETATTR_SIZE;
2136                         release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_EXCL |
2137                                    CEPH_CAP_FILE_RD | CEPH_CAP_FILE_WR;
2138                 }
2139         }
2140         if (ia_valid & ATTR_MTIME) {
2141                 dout("setattr %p mtime %lld.%ld -> %lld.%ld\n", inode,
2142                      inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
2143                      attr->ia_mtime.tv_sec, attr->ia_mtime.tv_nsec);
2144                 if (issued & CEPH_CAP_FILE_EXCL) {
2145                         ci->i_time_warp_seq++;
2146                         inode->i_mtime = attr->ia_mtime;
2147                         dirtied |= CEPH_CAP_FILE_EXCL;
2148                 } else if ((issued & CEPH_CAP_FILE_WR) &&
2149                            timespec64_compare(&inode->i_mtime,
2150                                             &attr->ia_mtime) < 0) {
2151                         inode->i_mtime = attr->ia_mtime;
2152                         dirtied |= CEPH_CAP_FILE_WR;
2153                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
2154                            !timespec64_equal(&inode->i_mtime, &attr->ia_mtime)) {
2155                         ceph_encode_timespec64(&req->r_args.setattr.mtime,
2156                                                &attr->ia_mtime);
2157                         mask |= CEPH_SETATTR_MTIME;
2158                         release |= CEPH_CAP_FILE_SHARED |
2159                                    CEPH_CAP_FILE_RD | CEPH_CAP_FILE_WR;
2160                 }
2161         }
2162
2163         /* these do nothing */
2164         if (ia_valid & ATTR_CTIME) {
2165                 bool only = (ia_valid & (ATTR_SIZE|ATTR_MTIME|ATTR_ATIME|
2166                                          ATTR_MODE|ATTR_UID|ATTR_GID)) == 0;
2167                 dout("setattr %p ctime %lld.%ld -> %lld.%ld (%s)\n", inode,
2168                      inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
2169                      attr->ia_ctime.tv_sec, attr->ia_ctime.tv_nsec,
2170                      only ? "ctime only" : "ignored");
2171                 if (only) {
2172                         /*
2173                          * if kernel wants to dirty ctime but nothing else,
2174                          * we need to choose a cap to dirty under, or do
2175                          * a almost-no-op setattr
2176                          */
2177                         if (issued & CEPH_CAP_AUTH_EXCL)
2178                                 dirtied |= CEPH_CAP_AUTH_EXCL;
2179                         else if (issued & CEPH_CAP_FILE_EXCL)
2180                                 dirtied |= CEPH_CAP_FILE_EXCL;
2181                         else if (issued & CEPH_CAP_XATTR_EXCL)
2182                                 dirtied |= CEPH_CAP_XATTR_EXCL;
2183                         else
2184                                 mask |= CEPH_SETATTR_CTIME;
2185                 }
2186         }
2187         if (ia_valid & ATTR_FILE)
2188                 dout("setattr %p ATTR_FILE ... hrm!\n", inode);
2189
2190         if (dirtied) {
2191                 inode_dirty_flags = __ceph_mark_dirty_caps(ci, dirtied,
2192                                                            &prealloc_cf);
2193                 inode->i_ctime = attr->ia_ctime;
2194         }
2195
2196         release &= issued;
2197         spin_unlock(&ci->i_ceph_lock);
2198         if (lock_snap_rwsem)
2199                 up_read(&mdsc->snap_rwsem);
2200
2201         if (inode_dirty_flags)
2202                 __mark_inode_dirty(inode, inode_dirty_flags);
2203
2204         if (mask) {
2205                 req->r_inode = inode;
2206                 ihold(inode);
2207                 req->r_inode_drop = release;
2208                 req->r_args.setattr.mask = cpu_to_le32(mask);
2209                 req->r_num_caps = 1;
2210                 req->r_stamp = attr->ia_ctime;
2211                 err = ceph_mdsc_do_request(mdsc, NULL, req);
2212         }
2213         dout("setattr %p result=%d (%s locally, %d remote)\n", inode, err,
2214              ceph_cap_string(dirtied), mask);
2215
2216         ceph_mdsc_put_request(req);
2217         ceph_free_cap_flush(prealloc_cf);
2218
2219         if (err >= 0 && (mask & CEPH_SETATTR_SIZE))
2220                 __ceph_do_pending_vmtruncate(inode);
2221
2222         return err;
2223 }
2224
2225 /*
2226  * setattr
2227  */
2228 int ceph_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
2229                  struct iattr *attr)
2230 {
2231         struct inode *inode = d_inode(dentry);
2232         struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
2233         int err;
2234
2235         if (ceph_snap(inode) != CEPH_NOSNAP)
2236                 return -EROFS;
2237
2238         if (ceph_inode_is_shutdown(inode))
2239                 return -ESTALE;
2240
2241         err = setattr_prepare(&init_user_ns, dentry, attr);
2242         if (err != 0)
2243                 return err;
2244
2245         if ((attr->ia_valid & ATTR_SIZE) &&
2246             attr->ia_size > max(i_size_read(inode), fsc->max_file_size))
2247                 return -EFBIG;
2248
2249         if ((attr->ia_valid & ATTR_SIZE) &&
2250             ceph_quota_is_max_bytes_exceeded(inode, attr->ia_size))
2251                 return -EDQUOT;
2252
2253         err = __ceph_setattr(inode, attr);
2254
2255         if (err >= 0 && (attr->ia_valid & ATTR_MODE))
2256                 err = posix_acl_chmod(&init_user_ns, inode, attr->ia_mode);
2257
2258         return err;
2259 }
2260
2261 /*
2262  * Verify that we have a lease on the given mask.  If not,
2263  * do a getattr against an mds.
2264  */
2265 int __ceph_do_getattr(struct inode *inode, struct page *locked_page,
2266                       int mask, bool force)
2267 {
2268         struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
2269         struct ceph_mds_client *mdsc = fsc->mdsc;
2270         struct ceph_mds_request *req;
2271         int mode;
2272         int err;
2273
2274         if (ceph_snap(inode) == CEPH_SNAPDIR) {
2275                 dout("do_getattr inode %p SNAPDIR\n", inode);
2276                 return 0;
2277         }
2278
2279         dout("do_getattr inode %p mask %s mode 0%o\n",
2280              inode, ceph_cap_string(mask), inode->i_mode);
2281         if (!force && ceph_caps_issued_mask_metric(ceph_inode(inode), mask, 1))
2282                         return 0;
2283
2284         mode = (mask & CEPH_STAT_RSTAT) ? USE_AUTH_MDS : USE_ANY_MDS;
2285         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, mode);
2286         if (IS_ERR(req))
2287                 return PTR_ERR(req);
2288         req->r_inode = inode;
2289         ihold(inode);
2290         req->r_num_caps = 1;
2291         req->r_args.getattr.mask = cpu_to_le32(mask);
2292         req->r_locked_page = locked_page;
2293         err = ceph_mdsc_do_request(mdsc, NULL, req);
2294         if (locked_page && err == 0) {
2295                 u64 inline_version = req->r_reply_info.targeti.inline_version;
2296                 if (inline_version == 0) {
2297                         /* the reply is supposed to contain inline data */
2298                         err = -EINVAL;
2299                 } else if (inline_version == CEPH_INLINE_NONE) {
2300                         err = -ENODATA;
2301                 } else {
2302                         err = req->r_reply_info.targeti.inline_len;
2303                 }
2304         }
2305         ceph_mdsc_put_request(req);
2306         dout("do_getattr result=%d\n", err);
2307         return err;
2308 }
2309
2310 int ceph_do_getvxattr(struct inode *inode, const char *name, void *value,
2311                       size_t size)
2312 {
2313         struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
2314         struct ceph_mds_client *mdsc = fsc->mdsc;
2315         struct ceph_mds_request *req;
2316         int mode = USE_AUTH_MDS;
2317         int err;
2318         char *xattr_value;
2319         size_t xattr_value_len;
2320
2321         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETVXATTR, mode);
2322         if (IS_ERR(req)) {
2323                 err = -ENOMEM;
2324                 goto out;
2325         }
2326
2327         req->r_path2 = kstrdup(name, GFP_NOFS);
2328         if (!req->r_path2) {
2329                 err = -ENOMEM;
2330                 goto put;
2331         }
2332
2333         ihold(inode);
2334         req->r_inode = inode;
2335         err = ceph_mdsc_do_request(mdsc, NULL, req);
2336         if (err < 0)
2337                 goto put;
2338
2339         xattr_value = req->r_reply_info.xattr_info.xattr_value;
2340         xattr_value_len = req->r_reply_info.xattr_info.xattr_value_len;
2341
2342         dout("do_getvxattr xattr_value_len:%zu, size:%zu\n", xattr_value_len, size);
2343
2344         err = (int)xattr_value_len;
2345         if (size == 0)
2346                 goto put;
2347
2348         if (xattr_value_len > size) {
2349                 err = -ERANGE;
2350                 goto put;
2351         }
2352
2353         memcpy(value, xattr_value, xattr_value_len);
2354 put:
2355         ceph_mdsc_put_request(req);
2356 out:
2357         dout("do_getvxattr result=%d\n", err);
2358         return err;
2359 }
2360
2361
2362 /*
2363  * Check inode permissions.  We verify we have a valid value for
2364  * the AUTH cap, then call the generic handler.
2365  */
2366 int ceph_permission(struct user_namespace *mnt_userns, struct inode *inode,
2367                     int mask)
2368 {
2369         int err;
2370
2371         if (mask & MAY_NOT_BLOCK)
2372                 return -ECHILD;
2373
2374         err = ceph_do_getattr(inode, CEPH_CAP_AUTH_SHARED, false);
2375
2376         if (!err)
2377                 err = generic_permission(&init_user_ns, inode, mask);
2378         return err;
2379 }
2380
2381 /* Craft a mask of needed caps given a set of requested statx attrs. */
2382 static int statx_to_caps(u32 want, umode_t mode)
2383 {
2384         int mask = 0;
2385
2386         if (want & (STATX_MODE|STATX_UID|STATX_GID|STATX_CTIME|STATX_BTIME))
2387                 mask |= CEPH_CAP_AUTH_SHARED;
2388
2389         if (want & (STATX_NLINK|STATX_CTIME)) {
2390                 /*
2391                  * The link count for directories depends on inode->i_subdirs,
2392                  * and that is only updated when Fs caps are held.
2393                  */
2394                 if (S_ISDIR(mode))
2395                         mask |= CEPH_CAP_FILE_SHARED;
2396                 else
2397                         mask |= CEPH_CAP_LINK_SHARED;
2398         }
2399
2400         if (want & (STATX_ATIME|STATX_MTIME|STATX_CTIME|STATX_SIZE|
2401                     STATX_BLOCKS))
2402                 mask |= CEPH_CAP_FILE_SHARED;
2403
2404         if (want & (STATX_CTIME))
2405                 mask |= CEPH_CAP_XATTR_SHARED;
2406
2407         return mask;
2408 }
2409
2410 /*
2411  * Get all the attributes. If we have sufficient caps for the requested attrs,
2412  * then we can avoid talking to the MDS at all.
2413  */
2414 int ceph_getattr(struct user_namespace *mnt_userns, const struct path *path,
2415                  struct kstat *stat, u32 request_mask, unsigned int flags)
2416 {
2417         struct inode *inode = d_inode(path->dentry);
2418         struct ceph_inode_info *ci = ceph_inode(inode);
2419         u32 valid_mask = STATX_BASIC_STATS;
2420         int err = 0;
2421
2422         if (ceph_inode_is_shutdown(inode))
2423                 return -ESTALE;
2424
2425         /* Skip the getattr altogether if we're asked not to sync */
2426         if (!(flags & AT_STATX_DONT_SYNC)) {
2427                 err = ceph_do_getattr(inode,
2428                                 statx_to_caps(request_mask, inode->i_mode),
2429                                 flags & AT_STATX_FORCE_SYNC);
2430                 if (err)
2431                         return err;
2432         }
2433
2434         generic_fillattr(&init_user_ns, inode, stat);
2435         stat->ino = ceph_present_inode(inode);
2436
2437         /*
2438          * btime on newly-allocated inodes is 0, so if this is still set to
2439          * that, then assume that it's not valid.
2440          */
2441         if (ci->i_btime.tv_sec || ci->i_btime.tv_nsec) {
2442                 stat->btime = ci->i_btime;
2443                 valid_mask |= STATX_BTIME;
2444         }
2445
2446         if (ceph_snap(inode) == CEPH_NOSNAP)
2447                 stat->dev = inode->i_sb->s_dev;
2448         else
2449                 stat->dev = ci->i_snapid_map ? ci->i_snapid_map->dev : 0;
2450
2451         if (S_ISDIR(inode->i_mode)) {
2452                 if (ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb),
2453                                         RBYTES))
2454                         stat->size = ci->i_rbytes;
2455                 else
2456                         stat->size = ci->i_files + ci->i_subdirs;
2457                 stat->blocks = 0;
2458                 stat->blksize = 65536;
2459                 /*
2460                  * Some applications rely on the number of st_nlink
2461                  * value on directories to be either 0 (if unlinked)
2462                  * or 2 + number of subdirectories.
2463                  */
2464                 if (stat->nlink == 1)
2465                         /* '.' + '..' + subdirs */
2466                         stat->nlink = 1 + 1 + ci->i_subdirs;
2467         }
2468
2469         stat->result_mask = request_mask & valid_mask;
2470         return err;
2471 }
2472
2473 void ceph_inode_shutdown(struct inode *inode)
2474 {
2475         struct ceph_inode_info *ci = ceph_inode(inode);
2476         struct rb_node *p;
2477         int iputs = 0;
2478         bool invalidate = false;
2479
2480         spin_lock(&ci->i_ceph_lock);
2481         ci->i_ceph_flags |= CEPH_I_SHUTDOWN;
2482         p = rb_first(&ci->i_caps);
2483         while (p) {
2484                 struct ceph_cap *cap = rb_entry(p, struct ceph_cap, ci_node);
2485
2486                 p = rb_next(p);
2487                 iputs += ceph_purge_inode_cap(inode, cap, &invalidate);
2488         }
2489         spin_unlock(&ci->i_ceph_lock);
2490
2491         if (invalidate)
2492                 ceph_queue_invalidate(inode);
2493         while (iputs--)
2494                 iput(inode);
2495 }