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->netfs.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->netfs.inode);
 461
 462         /* Set parameters for the netfs library */
 463         netfs_inode_init(&ci->netfs, &ceph_netfs_ops);
 464
 465         spin_lock_init(&ci->i_ceph_lock);
 466
 467         ci->i_version = 0;
 468         ci->i_inline_version = 0;
 469         ci->i_time_warp_seq = 0;
 470         ci->i_ceph_flags = 0;
 471         atomic64_set(&ci->i_ordered_count, 1);
 472         atomic64_set(&ci->i_release_count, 1);
 473         atomic64_set(&ci->i_complete_seq[0], 0);
 474         atomic64_set(&ci->i_complete_seq[1], 0);
 475         ci->i_symlink = NULL;
 476
 477         ci->i_max_bytes = 0;
 478         ci->i_max_files = 0;
 479
 480         memset(&ci->i_dir_layout, 0, sizeof(ci->i_dir_layout));
 481         memset(&ci->i_cached_layout, 0, sizeof(ci->i_cached_layout));
 482         RCU_INIT_POINTER(ci->i_layout.pool_ns, NULL);
 483
 484         ci->i_fragtree = RB_ROOT;
 485         mutex_init(&ci->i_fragtree_mutex);
 486
 487         ci->i_xattrs.blob = NULL;
 488         ci->i_xattrs.prealloc_blob = NULL;
 489         ci->i_xattrs.dirty = false;
 490         ci->i_xattrs.index = RB_ROOT;
 491         ci->i_xattrs.count = 0;
 492         ci->i_xattrs.names_size = 0;
 493         ci->i_xattrs.vals_size = 0;
 494         ci->i_xattrs.version = 0;
 495         ci->i_xattrs.index_version = 0;
 496
 497         ci->i_caps = RB_ROOT;
 498         ci->i_auth_cap = NULL;
 499         ci->i_dirty_caps = 0;
 500         ci->i_flushing_caps = 0;
 501         INIT_LIST_HEAD(&ci->i_dirty_item);
 502         INIT_LIST_HEAD(&ci->i_flushing_item);
 503         ci->i_prealloc_cap_flush = NULL;
 504         INIT_LIST_HEAD(&ci->i_cap_flush_list);
 505         init_waitqueue_head(&ci->i_cap_wq);
 506         ci->i_hold_caps_max = 0;
 507         INIT_LIST_HEAD(&ci->i_cap_delay_list);
 508         INIT_LIST_HEAD(&ci->i_cap_snaps);
 509         ci->i_head_snapc = NULL;
 510         ci->i_snap_caps = 0;
 511
 512         ci->i_last_rd = ci->i_last_wr = jiffies - 3600 * HZ;
 513         for (i = 0; i < CEPH_FILE_MODE_BITS; i++)
 514                 ci->i_nr_by_mode[i] = 0;
 515
 516         mutex_init(&ci->i_truncate_mutex);
 517         ci->i_truncate_seq = 0;
 518         ci->i_truncate_size = 0;
 519         ci->i_truncate_pending = 0;
 520
 521         ci->i_max_size = 0;
 522         ci->i_reported_size = 0;
 523         ci->i_wanted_max_size = 0;
 524         ci->i_requested_max_size = 0;
 525
 526         ci->i_pin_ref = 0;
 527         ci->i_rd_ref = 0;
 528         ci->i_rdcache_ref = 0;
 529         ci->i_wr_ref = 0;
 530         ci->i_wb_ref = 0;
 531         ci->i_fx_ref = 0;
 532         ci->i_wrbuffer_ref = 0;
 533         ci->i_wrbuffer_ref_head = 0;
 534         atomic_set(&ci->i_filelock_ref, 0);
 535         atomic_set(&ci->i_shared_gen, 1);
 536         ci->i_rdcache_gen = 0;
 537         ci->i_rdcache_revoking = 0;
 538
 539         INIT_LIST_HEAD(&ci->i_unsafe_dirops);
 540         INIT_LIST_HEAD(&ci->i_unsafe_iops);
 541         spin_lock_init(&ci->i_unsafe_lock);
 542
 543         ci->i_snap_realm = NULL;
 544         INIT_LIST_HEAD(&ci->i_snap_realm_item);
 545         INIT_LIST_HEAD(&ci->i_snap_flush_item);
 546
 547         INIT_WORK(&ci->i_work, ceph_inode_work);
 548         ci->i_work_mask = 0;
 549         memset(&ci->i_btime, '\0', sizeof(ci->i_btime));
 550         return &ci->netfs.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_quota(ci, QUOTA_GET_ANY))
 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                         }
1470
1471                         if (!d_unhashed(dn) && have_lease)
1472                                 update_dentry_lease(dir, dn,
1473                                                     rinfo->dlease, session,
1474                                                     req->r_request_started);
1475                         goto done;
1476                 }
1477
1478                 /* attach proper inode */
1479                 if (d_really_is_negative(dn)) {
1480                         ceph_dir_clear_ordered(dir);
1481                         ihold(in);
1482                         err = splice_dentry(&req->r_dentry, in);
1483                         if (err < 0)
1484                                 goto done;
1485                         dn = req->r_dentry;  /* may have spliced */
1486                 } else if (d_really_is_positive(dn) && d_inode(dn) != in) {
1487                         dout(" %p links to %p %llx.%llx, not %llx.%llx\n",
1488                              dn, d_inode(dn), ceph_vinop(d_inode(dn)),
1489                              ceph_vinop(in));
1490                         d_invalidate(dn);
1491                         have_lease = false;
1492                 }
1493
1494                 if (have_lease) {
1495                         update_dentry_lease(dir, dn,
1496                                             rinfo->dlease, session,
1497                                             req->r_request_started);
1498                 }
1499                 dout(" final dn %p\n", dn);
1500         } else if ((req->r_op == CEPH_MDS_OP_LOOKUPSNAP ||
1501                     req->r_op == CEPH_MDS_OP_MKSNAP) &&
1502                    test_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags) &&
1503                    !test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
1504                 struct inode *dir = req->r_parent;
1505
1506                 /* fill out a snapdir LOOKUPSNAP dentry */
1507                 BUG_ON(!dir);
1508                 BUG_ON(ceph_snap(dir) != CEPH_SNAPDIR);
1509                 BUG_ON(!req->r_dentry);
1510                 dout(" linking snapped dir %p to dn %p\n", in, req->r_dentry);
1511                 ceph_dir_clear_ordered(dir);
1512                 ihold(in);
1513                 err = splice_dentry(&req->r_dentry, in);
1514                 if (err < 0)
1515                         goto done;
1516         } else if (rinfo->head->is_dentry && req->r_dentry) {
1517                 /* parent inode is not locked, be carefull */
1518                 struct ceph_vino *ptvino = NULL;
1519                 dvino.ino = le64_to_cpu(rinfo->diri.in->ino);
1520                 dvino.snap = le64_to_cpu(rinfo->diri.in->snapid);
1521                 if (rinfo->head->is_target) {
1522                         tvino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1523                         tvino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1524                         ptvino = &tvino;
1525                 }
1526                 update_dentry_lease_careful(req->r_dentry, rinfo->dlease,
1527                                             session, req->r_request_started,
1528                                             rinfo->dname, rinfo->dname_len,
1529                                             &dvino, ptvino);
1530         }
1531 done:
1532         dout("fill_trace done err=%d\n", err);
1533         return err;
1534 }
1535
1536 /*
1537  * Prepopulate our cache with readdir results, leases, etc.
1538  */
1539 static int readdir_prepopulate_inodes_only(struct ceph_mds_request *req,
1540                                            struct ceph_mds_session *session)
1541 {
1542         struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1543         int i, err = 0;
1544
1545         for (i = 0; i < rinfo->dir_nr; i++) {
1546                 struct ceph_mds_reply_dir_entry *rde = rinfo->dir_entries + i;
1547                 struct ceph_vino vino;
1548                 struct inode *in;
1549                 int rc;
1550
1551                 vino.ino = le64_to_cpu(rde->inode.in->ino);
1552                 vino.snap = le64_to_cpu(rde->inode.in->snapid);
1553
1554                 in = ceph_get_inode(req->r_dentry->d_sb, vino);
1555                 if (IS_ERR(in)) {
1556                         err = PTR_ERR(in);
1557                         dout("new_inode badness got %d\n", err);
1558                         continue;
1559                 }
1560                 rc = ceph_fill_inode(in, NULL, &rde->inode, NULL, session,
1561                                      -1, &req->r_caps_reservation);
1562                 if (rc < 0) {
1563                         pr_err("ceph_fill_inode badness on %p got %d\n",
1564                                in, rc);
1565                         err = rc;
1566                         if (in->i_state & I_NEW) {
1567                                 ihold(in);
1568                                 discard_new_inode(in);
1569                         }
1570                 } else if (in->i_state & I_NEW) {
1571                         unlock_new_inode(in);
1572                 }
1573
1574                 iput(in);
1575         }
1576
1577         return err;
1578 }
1579
1580 void ceph_readdir_cache_release(struct ceph_readdir_cache_control *ctl)
1581 {
1582         if (ctl->page) {
1583                 kunmap(ctl->page);
1584                 put_page(ctl->page);
1585                 ctl->page = NULL;
1586         }
1587 }
1588
1589 static int fill_readdir_cache(struct inode *dir, struct dentry *dn,
1590                               struct ceph_readdir_cache_control *ctl,
1591                               struct ceph_mds_request *req)
1592 {
1593         struct ceph_inode_info *ci = ceph_inode(dir);
1594         unsigned nsize = PAGE_SIZE / sizeof(struct dentry*);
1595         unsigned idx = ctl->index % nsize;
1596         pgoff_t pgoff = ctl->index / nsize;
1597
1598         if (!ctl->page || pgoff != page_index(ctl->page)) {
1599                 ceph_readdir_cache_release(ctl);
1600                 if (idx == 0)
1601                         ctl->page = grab_cache_page(&dir->i_data, pgoff);
1602                 else
1603                         ctl->page = find_lock_page(&dir->i_data, pgoff);
1604                 if (!ctl->page) {
1605                         ctl->index = -1;
1606                         return idx == 0 ? -ENOMEM : 0;
1607                 }
1608                 /* reading/filling the cache are serialized by
1609                  * i_rwsem, no need to use page lock */
1610                 unlock_page(ctl->page);
1611                 ctl->dentries = kmap(ctl->page);
1612                 if (idx == 0)
1613                         memset(ctl->dentries, 0, PAGE_SIZE);
1614         }
1615
1616         if (req->r_dir_release_cnt == atomic64_read(&ci->i_release_count) &&
1617             req->r_dir_ordered_cnt == atomic64_read(&ci->i_ordered_count)) {
1618                 dout("readdir cache dn %p idx %d\n", dn, ctl->index);
1619                 ctl->dentries[idx] = dn;
1620                 ctl->index++;
1621         } else {
1622                 dout("disable readdir cache\n");
1623                 ctl->index = -1;
1624         }
1625         return 0;
1626 }
1627
1628 int ceph_readdir_prepopulate(struct ceph_mds_request *req,
1629                              struct ceph_mds_session *session)
1630 {
1631         struct dentry *parent = req->r_dentry;
1632         struct ceph_inode_info *ci = ceph_inode(d_inode(parent));
1633         struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1634         struct qstr dname;
1635         struct dentry *dn;
1636         struct inode *in;
1637         int err = 0, skipped = 0, ret, i;
1638         u32 frag = le32_to_cpu(req->r_args.readdir.frag);
1639         u32 last_hash = 0;
1640         u32 fpos_offset;
1641         struct ceph_readdir_cache_control cache_ctl = {};
1642
1643         if (test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags))
1644                 return readdir_prepopulate_inodes_only(req, session);
1645
1646         if (rinfo->hash_order) {
1647                 if (req->r_path2) {
1648                         last_hash = ceph_str_hash(ci->i_dir_layout.dl_dir_hash,
1649                                                   req->r_path2,
1650                                                   strlen(req->r_path2));
1651                         last_hash = ceph_frag_value(last_hash);
1652                 } else if (rinfo->offset_hash) {
1653                         /* mds understands offset_hash */
1654                         WARN_ON_ONCE(req->r_readdir_offset != 2);
1655                         last_hash = le32_to_cpu(req->r_args.readdir.offset_hash);
1656                 }
1657         }
1658
1659         if (rinfo->dir_dir &&
1660             le32_to_cpu(rinfo->dir_dir->frag) != frag) {
1661                 dout("readdir_prepopulate got new frag %x -> %x\n",
1662                      frag, le32_to_cpu(rinfo->dir_dir->frag));
1663                 frag = le32_to_cpu(rinfo->dir_dir->frag);
1664                 if (!rinfo->hash_order)
1665                         req->r_readdir_offset = 2;
1666         }
1667
1668         if (le32_to_cpu(rinfo->head->op) == CEPH_MDS_OP_LSSNAP) {
1669                 dout("readdir_prepopulate %d items under SNAPDIR dn %p\n",
1670                      rinfo->dir_nr, parent);
1671         } else {
1672                 dout("readdir_prepopulate %d items under dn %p\n",
1673                      rinfo->dir_nr, parent);
1674                 if (rinfo->dir_dir)
1675                         ceph_fill_dirfrag(d_inode(parent), rinfo->dir_dir);
1676
1677                 if (ceph_frag_is_leftmost(frag) &&
1678                     req->r_readdir_offset == 2 &&
1679                     !(rinfo->hash_order && last_hash)) {
1680                         /* note dir version at start of readdir so we can
1681                          * tell if any dentries get dropped */
1682                         req->r_dir_release_cnt =
1683                                 atomic64_read(&ci->i_release_count);
1684                         req->r_dir_ordered_cnt =
1685                                 atomic64_read(&ci->i_ordered_count);
1686                         req->r_readdir_cache_idx = 0;
1687                 }
1688         }
1689
1690         cache_ctl.index = req->r_readdir_cache_idx;
1691         fpos_offset = req->r_readdir_offset;
1692
1693         /* FIXME: release caps/leases if error occurs */
1694         for (i = 0; i < rinfo->dir_nr; i++) {
1695                 struct ceph_mds_reply_dir_entry *rde = rinfo->dir_entries + i;
1696                 struct ceph_vino tvino;
1697
1698                 dname.name = rde->name;
1699                 dname.len = rde->name_len;
1700                 dname.hash = full_name_hash(parent, dname.name, dname.len);
1701
1702                 tvino.ino = le64_to_cpu(rde->inode.in->ino);
1703                 tvino.snap = le64_to_cpu(rde->inode.in->snapid);
1704
1705                 if (rinfo->hash_order) {
1706                         u32 hash = ceph_str_hash(ci->i_dir_layout.dl_dir_hash,
1707                                                  rde->name, rde->name_len);
1708                         hash = ceph_frag_value(hash);
1709                         if (hash != last_hash)
1710                                 fpos_offset = 2;
1711                         last_hash = hash;
1712                         rde->offset = ceph_make_fpos(hash, fpos_offset++, true);
1713                 } else {
1714                         rde->offset = ceph_make_fpos(frag, fpos_offset++, false);
1715                 }
1716
1717 retry_lookup:
1718                 dn = d_lookup(parent, &dname);
1719                 dout("d_lookup on parent=%p name=%.*s got %p\n",
1720                      parent, dname.len, dname.name, dn);
1721
1722                 if (!dn) {
1723                         dn = d_alloc(parent, &dname);
1724                         dout("d_alloc %p '%.*s' = %p\n", parent,
1725                              dname.len, dname.name, dn);
1726                         if (!dn) {
1727                                 dout("d_alloc badness\n");
1728                                 err = -ENOMEM;
1729                                 goto out;
1730                         }
1731                 } else if (d_really_is_positive(dn) &&
1732                            (ceph_ino(d_inode(dn)) != tvino.ino ||
1733                             ceph_snap(d_inode(dn)) != tvino.snap)) {
1734                         struct ceph_dentry_info *di = ceph_dentry(dn);
1735                         dout(" dn %p points to wrong inode %p\n",
1736                              dn, d_inode(dn));
1737
1738                         spin_lock(&dn->d_lock);
1739                         if (di->offset > 0 &&
1740                             di->lease_shared_gen ==
1741                             atomic_read(&ci->i_shared_gen)) {
1742                                 __ceph_dir_clear_ordered(ci);
1743                                 di->offset = 0;
1744                         }
1745                         spin_unlock(&dn->d_lock);
1746
1747                         d_delete(dn);
1748                         dput(dn);
1749                         goto retry_lookup;
1750                 }
1751
1752                 /* inode */
1753                 if (d_really_is_positive(dn)) {
1754                         in = d_inode(dn);
1755                 } else {
1756                         in = ceph_get_inode(parent->d_sb, tvino);
1757                         if (IS_ERR(in)) {
1758                                 dout("new_inode badness\n");
1759                                 d_drop(dn);
1760                                 dput(dn);
1761                                 err = PTR_ERR(in);
1762                                 goto out;
1763                         }
1764                 }
1765
1766                 ret = ceph_fill_inode(in, NULL, &rde->inode, NULL, session,
1767                                       -1, &req->r_caps_reservation);
1768                 if (ret < 0) {
1769                         pr_err("ceph_fill_inode badness on %p\n", in);
1770                         if (d_really_is_negative(dn)) {
1771                                 if (in->i_state & I_NEW) {
1772                                         ihold(in);
1773                                         discard_new_inode(in);
1774                                 }
1775                                 iput(in);
1776                         }
1777                         d_drop(dn);
1778                         err = ret;
1779                         goto next_item;
1780                 }
1781                 if (in->i_state & I_NEW)
1782                         unlock_new_inode(in);
1783
1784                 if (d_really_is_negative(dn)) {
1785                         if (ceph_security_xattr_deadlock(in)) {
1786                                 dout(" skip splicing dn %p to inode %p"
1787                                      " (security xattr deadlock)\n", dn, in);
1788                                 iput(in);
1789                                 skipped++;
1790                                 goto next_item;
1791                         }
1792
1793                         err = splice_dentry(&dn, in);
1794                         if (err < 0)
1795                                 goto next_item;
1796                 }
1797
1798                 ceph_dentry(dn)->offset = rde->offset;
1799
1800                 update_dentry_lease(d_inode(parent), dn,
1801                                     rde->lease, req->r_session,
1802                                     req->r_request_started);
1803
1804                 if (err == 0 && skipped == 0 && cache_ctl.index >= 0) {
1805                         ret = fill_readdir_cache(d_inode(parent), dn,
1806                                                  &cache_ctl, req);
1807                         if (ret < 0)
1808                                 err = ret;
1809                 }
1810 next_item:
1811                 dput(dn);
1812         }
1813 out:
1814         if (err == 0 && skipped == 0) {
1815                 set_bit(CEPH_MDS_R_DID_PREPOPULATE, &req->r_req_flags);
1816                 req->r_readdir_cache_idx = cache_ctl.index;
1817         }
1818         ceph_readdir_cache_release(&cache_ctl);
1819         dout("readdir_prepopulate done\n");
1820         return err;
1821 }
1822
1823 bool ceph_inode_set_size(struct inode *inode, loff_t size)
1824 {
1825         struct ceph_inode_info *ci = ceph_inode(inode);
1826         bool ret;
1827
1828         spin_lock(&ci->i_ceph_lock);
1829         dout("set_size %p %llu -> %llu\n", inode, i_size_read(inode), size);
1830         i_size_write(inode, size);
1831         ceph_fscache_update(inode);
1832         inode->i_blocks = calc_inode_blocks(size);
1833
1834         ret = __ceph_should_report_size(ci);
1835
1836         spin_unlock(&ci->i_ceph_lock);
1837
1838         return ret;
1839 }
1840
1841 void ceph_queue_inode_work(struct inode *inode, int work_bit)
1842 {
1843         struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1844         struct ceph_inode_info *ci = ceph_inode(inode);
1845         set_bit(work_bit, &ci->i_work_mask);
1846
1847         ihold(inode);
1848         if (queue_work(fsc->inode_wq, &ci->i_work)) {
1849                 dout("queue_inode_work %p, mask=%lx\n", inode, ci->i_work_mask);
1850         } else {
1851                 dout("queue_inode_work %p already queued, mask=%lx\n",
1852                      inode, ci->i_work_mask);
1853                 iput(inode);
1854         }
1855 }
1856
1857 static void ceph_do_invalidate_pages(struct inode *inode)
1858 {
1859         struct ceph_inode_info *ci = ceph_inode(inode);
1860         u32 orig_gen;
1861         int check = 0;
1862
1863         ceph_fscache_invalidate(inode, false);
1864
1865         mutex_lock(&ci->i_truncate_mutex);
1866
1867         if (ceph_inode_is_shutdown(inode)) {
1868                 pr_warn_ratelimited("%s: inode %llx.%llx is shut down\n",
1869                                     __func__, ceph_vinop(inode));
1870                 mapping_set_error(inode->i_mapping, -EIO);
1871                 truncate_pagecache(inode, 0);
1872                 mutex_unlock(&ci->i_truncate_mutex);
1873                 goto out;
1874         }
1875
1876         spin_lock(&ci->i_ceph_lock);
1877         dout("invalidate_pages %p gen %d revoking %d\n", inode,
1878              ci->i_rdcache_gen, ci->i_rdcache_revoking);
1879         if (ci->i_rdcache_revoking != ci->i_rdcache_gen) {
1880                 if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE))
1881                         check = 1;
1882                 spin_unlock(&ci->i_ceph_lock);
1883                 mutex_unlock(&ci->i_truncate_mutex);
1884                 goto out;
1885         }
1886         orig_gen = ci->i_rdcache_gen;
1887         spin_unlock(&ci->i_ceph_lock);
1888
1889         if (invalidate_inode_pages2(inode->i_mapping) < 0) {
1890                 pr_err("invalidate_inode_pages2 %llx.%llx failed\n",
1891                        ceph_vinop(inode));
1892         }
1893
1894         spin_lock(&ci->i_ceph_lock);
1895         if (orig_gen == ci->i_rdcache_gen &&
1896             orig_gen == ci->i_rdcache_revoking) {
1897                 dout("invalidate_pages %p gen %d successful\n", inode,
1898                      ci->i_rdcache_gen);
1899                 ci->i_rdcache_revoking--;
1900                 check = 1;
1901         } else {
1902                 dout("invalidate_pages %p gen %d raced, now %d revoking %d\n",
1903                      inode, orig_gen, ci->i_rdcache_gen,
1904                      ci->i_rdcache_revoking);
1905                 if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE))
1906                         check = 1;
1907         }
1908         spin_unlock(&ci->i_ceph_lock);
1909         mutex_unlock(&ci->i_truncate_mutex);
1910 out:
1911         if (check)
1912                 ceph_check_caps(ci, 0, NULL);
1913 }
1914
1915 /*
1916  * Make sure any pending truncation is applied before doing anything
1917  * that may depend on it.
1918  */
1919 void __ceph_do_pending_vmtruncate(struct inode *inode)
1920 {
1921         struct ceph_inode_info *ci = ceph_inode(inode);
1922         u64 to;
1923         int wrbuffer_refs, finish = 0;
1924
1925         mutex_lock(&ci->i_truncate_mutex);
1926 retry:
1927         spin_lock(&ci->i_ceph_lock);
1928         if (ci->i_truncate_pending == 0) {
1929                 dout("__do_pending_vmtruncate %p none pending\n", inode);
1930                 spin_unlock(&ci->i_ceph_lock);
1931                 mutex_unlock(&ci->i_truncate_mutex);
1932                 return;
1933         }
1934
1935         /*
1936          * make sure any dirty snapped pages are flushed before we
1937          * possibly truncate them.. so write AND block!
1938          */
1939         if (ci->i_wrbuffer_ref_head < ci->i_wrbuffer_ref) {
1940                 spin_unlock(&ci->i_ceph_lock);
1941                 dout("__do_pending_vmtruncate %p flushing snaps first\n",
1942                      inode);
1943                 filemap_write_and_wait_range(&inode->i_data, 0,
1944                                              inode->i_sb->s_maxbytes);
1945                 goto retry;
1946         }
1947
1948         /* there should be no reader or writer */
1949         WARN_ON_ONCE(ci->i_rd_ref || ci->i_wr_ref);
1950
1951         to = ci->i_truncate_size;
1952         wrbuffer_refs = ci->i_wrbuffer_ref;
1953         dout("__do_pending_vmtruncate %p (%d) to %lld\n", inode,
1954              ci->i_truncate_pending, to);
1955         spin_unlock(&ci->i_ceph_lock);
1956
1957         ceph_fscache_resize(inode, to);
1958         truncate_pagecache(inode, to);
1959
1960         spin_lock(&ci->i_ceph_lock);
1961         if (to == ci->i_truncate_size) {
1962                 ci->i_truncate_pending = 0;
1963                 finish = 1;
1964         }
1965         spin_unlock(&ci->i_ceph_lock);
1966         if (!finish)
1967                 goto retry;
1968
1969         mutex_unlock(&ci->i_truncate_mutex);
1970
1971         if (wrbuffer_refs == 0)
1972                 ceph_check_caps(ci, 0, NULL);
1973
1974         wake_up_all(&ci->i_cap_wq);
1975 }
1976
1977 static void ceph_inode_work(struct work_struct *work)
1978 {
1979         struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1980                                                  i_work);
1981         struct inode *inode = &ci->netfs.inode;
1982
1983         if (test_and_clear_bit(CEPH_I_WORK_WRITEBACK, &ci->i_work_mask)) {
1984                 dout("writeback %p\n", inode);
1985                 filemap_fdatawrite(&inode->i_data);
1986         }
1987         if (test_and_clear_bit(CEPH_I_WORK_INVALIDATE_PAGES, &ci->i_work_mask))
1988                 ceph_do_invalidate_pages(inode);
1989
1990         if (test_and_clear_bit(CEPH_I_WORK_VMTRUNCATE, &ci->i_work_mask))
1991                 __ceph_do_pending_vmtruncate(inode);
1992
1993         if (test_and_clear_bit(CEPH_I_WORK_CHECK_CAPS, &ci->i_work_mask))
1994                 ceph_check_caps(ci, 0, NULL);
1995
1996         if (test_and_clear_bit(CEPH_I_WORK_FLUSH_SNAPS, &ci->i_work_mask))
1997                 ceph_flush_snaps(ci, NULL);
1998
1999         iput(inode);
2000 }
2001
2002 /*
2003  * symlinks
2004  */
2005 static const struct inode_operations ceph_symlink_iops = {
2006         .get_link = simple_get_link,
2007         .setattr = ceph_setattr,
2008         .getattr = ceph_getattr,
2009         .listxattr = ceph_listxattr,
2010 };
2011
2012 int __ceph_setattr(struct inode *inode, struct iattr *attr)
2013 {
2014         struct ceph_inode_info *ci = ceph_inode(inode);
2015         unsigned int ia_valid = attr->ia_valid;
2016         struct ceph_mds_request *req;
2017         struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
2018         struct ceph_cap_flush *prealloc_cf;
2019         int issued;
2020         int release = 0, dirtied = 0;
2021         int mask = 0;
2022         int err = 0;
2023         int inode_dirty_flags = 0;
2024         bool lock_snap_rwsem = false;
2025
2026         prealloc_cf = ceph_alloc_cap_flush();
2027         if (!prealloc_cf)
2028                 return -ENOMEM;
2029
2030         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETATTR,
2031                                        USE_AUTH_MDS);
2032         if (IS_ERR(req)) {
2033                 ceph_free_cap_flush(prealloc_cf);
2034                 return PTR_ERR(req);
2035         }
2036
2037         spin_lock(&ci->i_ceph_lock);
2038         issued = __ceph_caps_issued(ci, NULL);
2039
2040         if (!ci->i_head_snapc &&
2041             (issued & (CEPH_CAP_ANY_EXCL | CEPH_CAP_FILE_WR))) {
2042                 lock_snap_rwsem = true;
2043                 if (!down_read_trylock(&mdsc->snap_rwsem)) {
2044                         spin_unlock(&ci->i_ceph_lock);
2045                         down_read(&mdsc->snap_rwsem);
2046                         spin_lock(&ci->i_ceph_lock);
2047                         issued = __ceph_caps_issued(ci, NULL);
2048                 }
2049         }
2050
2051         dout("setattr %p issued %s\n", inode, ceph_cap_string(issued));
2052
2053         if (ia_valid & ATTR_UID) {
2054                 dout("setattr %p uid %d -> %d\n", inode,
2055                      from_kuid(&init_user_ns, inode->i_uid),
2056                      from_kuid(&init_user_ns, attr->ia_uid));
2057                 if (issued & CEPH_CAP_AUTH_EXCL) {
2058                         inode->i_uid = attr->ia_uid;
2059                         dirtied |= CEPH_CAP_AUTH_EXCL;
2060                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
2061                            !uid_eq(attr->ia_uid, inode->i_uid)) {
2062                         req->r_args.setattr.uid = cpu_to_le32(
2063                                 from_kuid(&init_user_ns, attr->ia_uid));
2064                         mask |= CEPH_SETATTR_UID;
2065                         release |= CEPH_CAP_AUTH_SHARED;
2066                 }
2067         }
2068         if (ia_valid & ATTR_GID) {
2069                 dout("setattr %p gid %d -> %d\n", inode,
2070                      from_kgid(&init_user_ns, inode->i_gid),
2071                      from_kgid(&init_user_ns, attr->ia_gid));
2072                 if (issued & CEPH_CAP_AUTH_EXCL) {
2073                         inode->i_gid = attr->ia_gid;
2074                         dirtied |= CEPH_CAP_AUTH_EXCL;
2075                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
2076                            !gid_eq(attr->ia_gid, inode->i_gid)) {
2077                         req->r_args.setattr.gid = cpu_to_le32(
2078                                 from_kgid(&init_user_ns, attr->ia_gid));
2079                         mask |= CEPH_SETATTR_GID;
2080                         release |= CEPH_CAP_AUTH_SHARED;
2081                 }
2082         }
2083         if (ia_valid & ATTR_MODE) {
2084                 dout("setattr %p mode 0%o -> 0%o\n", inode, inode->i_mode,
2085                      attr->ia_mode);
2086                 if (issued & CEPH_CAP_AUTH_EXCL) {
2087                         inode->i_mode = attr->ia_mode;
2088                         dirtied |= CEPH_CAP_AUTH_EXCL;
2089                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
2090                            attr->ia_mode != inode->i_mode) {
2091                         inode->i_mode = attr->ia_mode;
2092                         req->r_args.setattr.mode = cpu_to_le32(attr->ia_mode);
2093                         mask |= CEPH_SETATTR_MODE;
2094                         release |= CEPH_CAP_AUTH_SHARED;
2095                 }
2096         }
2097
2098         if (ia_valid & ATTR_ATIME) {
2099                 dout("setattr %p atime %lld.%ld -> %lld.%ld\n", inode,
2100                      inode->i_atime.tv_sec, inode->i_atime.tv_nsec,
2101                      attr->ia_atime.tv_sec, attr->ia_atime.tv_nsec);
2102                 if (issued & CEPH_CAP_FILE_EXCL) {
2103                         ci->i_time_warp_seq++;
2104                         inode->i_atime = attr->ia_atime;
2105                         dirtied |= CEPH_CAP_FILE_EXCL;
2106                 } else if ((issued & CEPH_CAP_FILE_WR) &&
2107                            timespec64_compare(&inode->i_atime,
2108                                             &attr->ia_atime) < 0) {
2109                         inode->i_atime = attr->ia_atime;
2110                         dirtied |= CEPH_CAP_FILE_WR;
2111                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
2112                            !timespec64_equal(&inode->i_atime, &attr->ia_atime)) {
2113                         ceph_encode_timespec64(&req->r_args.setattr.atime,
2114                                                &attr->ia_atime);
2115                         mask |= CEPH_SETATTR_ATIME;
2116                         release |= CEPH_CAP_FILE_SHARED |
2117                                    CEPH_CAP_FILE_RD | CEPH_CAP_FILE_WR;
2118                 }
2119         }
2120         if (ia_valid & ATTR_SIZE) {
2121                 loff_t isize = i_size_read(inode);
2122
2123                 dout("setattr %p size %lld -> %lld\n", inode, isize, attr->ia_size);
2124                 if ((issued & CEPH_CAP_FILE_EXCL) && attr->ia_size >= isize) {
2125                         if (attr->ia_size > isize) {
2126                                 i_size_write(inode, attr->ia_size);
2127                                 inode->i_blocks = calc_inode_blocks(attr->ia_size);
2128                                 ci->i_reported_size = attr->ia_size;
2129                                 dirtied |= CEPH_CAP_FILE_EXCL;
2130                                 ia_valid |= ATTR_MTIME;
2131                         }
2132                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
2133                            attr->ia_size != isize) {
2134                         req->r_args.setattr.size = cpu_to_le64(attr->ia_size);
2135                         req->r_args.setattr.old_size = cpu_to_le64(isize);
2136                         mask |= CEPH_SETATTR_SIZE;
2137                         release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_EXCL |
2138                                    CEPH_CAP_FILE_RD | CEPH_CAP_FILE_WR;
2139                 }
2140         }
2141         if (ia_valid & ATTR_MTIME) {
2142                 dout("setattr %p mtime %lld.%ld -> %lld.%ld\n", inode,
2143                      inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
2144                      attr->ia_mtime.tv_sec, attr->ia_mtime.tv_nsec);
2145                 if (issued & CEPH_CAP_FILE_EXCL) {
2146                         ci->i_time_warp_seq++;
2147                         inode->i_mtime = attr->ia_mtime;
2148                         dirtied |= CEPH_CAP_FILE_EXCL;
2149                 } else if ((issued & CEPH_CAP_FILE_WR) &&
2150                            timespec64_compare(&inode->i_mtime,
2151                                             &attr->ia_mtime) < 0) {
2152                         inode->i_mtime = attr->ia_mtime;
2153                         dirtied |= CEPH_CAP_FILE_WR;
2154                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
2155                            !timespec64_equal(&inode->i_mtime, &attr->ia_mtime)) {
2156                         ceph_encode_timespec64(&req->r_args.setattr.mtime,
2157                                                &attr->ia_mtime);
2158                         mask |= CEPH_SETATTR_MTIME;
2159                         release |= CEPH_CAP_FILE_SHARED |
2160                                    CEPH_CAP_FILE_RD | CEPH_CAP_FILE_WR;
2161                 }
2162         }
2163
2164         /* these do nothing */
2165         if (ia_valid & ATTR_CTIME) {
2166                 bool only = (ia_valid & (ATTR_SIZE|ATTR_MTIME|ATTR_ATIME|
2167                                          ATTR_MODE|ATTR_UID|ATTR_GID)) == 0;
2168                 dout("setattr %p ctime %lld.%ld -> %lld.%ld (%s)\n", inode,
2169                      inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
2170                      attr->ia_ctime.tv_sec, attr->ia_ctime.tv_nsec,
2171                      only ? "ctime only" : "ignored");
2172                 if (only) {
2173                         /*
2174                          * if kernel wants to dirty ctime but nothing else,
2175                          * we need to choose a cap to dirty under, or do
2176                          * a almost-no-op setattr
2177                          */
2178                         if (issued & CEPH_CAP_AUTH_EXCL)
2179                                 dirtied |= CEPH_CAP_AUTH_EXCL;
2180                         else if (issued & CEPH_CAP_FILE_EXCL)
2181                                 dirtied |= CEPH_CAP_FILE_EXCL;
2182                         else if (issued & CEPH_CAP_XATTR_EXCL)
2183                                 dirtied |= CEPH_CAP_XATTR_EXCL;
2184                         else
2185                                 mask |= CEPH_SETATTR_CTIME;
2186                 }
2187         }
2188         if (ia_valid & ATTR_FILE)
2189                 dout("setattr %p ATTR_FILE ... hrm!\n", inode);
2190
2191         if (dirtied) {
2192                 inode_dirty_flags = __ceph_mark_dirty_caps(ci, dirtied,
2193                                                            &prealloc_cf);
2194                 inode->i_ctime = attr->ia_ctime;
2195         }
2196
2197         release &= issued;
2198         spin_unlock(&ci->i_ceph_lock);
2199         if (lock_snap_rwsem)
2200                 up_read(&mdsc->snap_rwsem);
2201
2202         if (inode_dirty_flags)
2203                 __mark_inode_dirty(inode, inode_dirty_flags);
2204
2205         if (mask) {
2206                 req->r_inode = inode;
2207                 ihold(inode);
2208                 req->r_inode_drop = release;
2209                 req->r_args.setattr.mask = cpu_to_le32(mask);
2210                 req->r_num_caps = 1;
2211                 req->r_stamp = attr->ia_ctime;
2212                 err = ceph_mdsc_do_request(mdsc, NULL, req);
2213         }
2214         dout("setattr %p result=%d (%s locally, %d remote)\n", inode, err,
2215              ceph_cap_string(dirtied), mask);
2216
2217         ceph_mdsc_put_request(req);
2218         ceph_free_cap_flush(prealloc_cf);
2219
2220         if (err >= 0 && (mask & CEPH_SETATTR_SIZE))
2221                 __ceph_do_pending_vmtruncate(inode);
2222
2223         return err;
2224 }
2225
2226 /*
2227  * setattr
2228  */
2229 int ceph_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
2230                  struct iattr *attr)
2231 {
2232         struct inode *inode = d_inode(dentry);
2233         struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
2234         int err;
2235
2236         if (ceph_snap(inode) != CEPH_NOSNAP)
2237                 return -EROFS;
2238
2239         if (ceph_inode_is_shutdown(inode))
2240                 return -ESTALE;
2241
2242         err = setattr_prepare(&init_user_ns, dentry, attr);
2243         if (err != 0)
2244                 return err;
2245
2246         if ((attr->ia_valid & ATTR_SIZE) &&
2247             attr->ia_size > max(i_size_read(inode), fsc->max_file_size))
2248                 return -EFBIG;
2249
2250         if ((attr->ia_valid & ATTR_SIZE) &&
2251             ceph_quota_is_max_bytes_exceeded(inode, attr->ia_size))
2252                 return -EDQUOT;
2253
2254         err = __ceph_setattr(inode, attr);
2255
2256         if (err >= 0 && (attr->ia_valid & ATTR_MODE))
2257                 err = posix_acl_chmod(&init_user_ns, inode, attr->ia_mode);
2258
2259         return err;
2260 }
2261
2262 int ceph_try_to_choose_auth_mds(struct inode *inode, int mask)
2263 {
2264         int issued = ceph_caps_issued(ceph_inode(inode));
2265
2266         /*
2267          * If any 'x' caps is issued we can just choose the auth MDS
2268          * instead of the random replica MDSes. Because only when the
2269          * Locker is in LOCK_EXEC state will the loner client could
2270          * get the 'x' caps. And if we send the getattr requests to
2271          * any replica MDS it must auth pin and tries to rdlock from
2272          * the auth MDS, and then the auth MDS need to do the Locker
2273          * state transition to LOCK_SYNC. And after that the lock state
2274          * will change back.
2275          *
2276          * This cost much when doing the Locker state transition and
2277          * usually will need to revoke caps from clients.
2278          */
2279         if (((mask & CEPH_CAP_ANY_SHARED) && (issued & CEPH_CAP_ANY_EXCL))
2280             || (mask & CEPH_STAT_RSTAT))
2281                 return USE_AUTH_MDS;
2282         else
2283                 return USE_ANY_MDS;
2284 }
2285
2286 /*
2287  * Verify that we have a lease on the given mask.  If not,
2288  * do a getattr against an mds.
2289  */
2290 int __ceph_do_getattr(struct inode *inode, struct page *locked_page,
2291                       int mask, bool force)
2292 {
2293         struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
2294         struct ceph_mds_client *mdsc = fsc->mdsc;
2295         struct ceph_mds_request *req;
2296         int mode;
2297         int err;
2298
2299         if (ceph_snap(inode) == CEPH_SNAPDIR) {
2300                 dout("do_getattr inode %p SNAPDIR\n", inode);
2301                 return 0;
2302         }
2303
2304         dout("do_getattr inode %p mask %s mode 0%o\n",
2305              inode, ceph_cap_string(mask), inode->i_mode);
2306         if (!force && ceph_caps_issued_mask_metric(ceph_inode(inode), mask, 1))
2307                         return 0;
2308
2309         mode = ceph_try_to_choose_auth_mds(inode, mask);
2310         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, mode);
2311         if (IS_ERR(req))
2312                 return PTR_ERR(req);
2313         req->r_inode = inode;
2314         ihold(inode);
2315         req->r_num_caps = 1;
2316         req->r_args.getattr.mask = cpu_to_le32(mask);
2317         req->r_locked_page = locked_page;
2318         err = ceph_mdsc_do_request(mdsc, NULL, req);
2319         if (locked_page && err == 0) {
2320                 u64 inline_version = req->r_reply_info.targeti.inline_version;
2321                 if (inline_version == 0) {
2322                         /* the reply is supposed to contain inline data */
2323                         err = -EINVAL;
2324                 } else if (inline_version == CEPH_INLINE_NONE) {
2325                         err = -ENODATA;
2326                 } else {
2327                         err = req->r_reply_info.targeti.inline_len;
2328                 }
2329         }
2330         ceph_mdsc_put_request(req);
2331         dout("do_getattr result=%d\n", err);
2332         return err;
2333 }
2334
2335 int ceph_do_getvxattr(struct inode *inode, const char *name, void *value,
2336                       size_t size)
2337 {
2338         struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
2339         struct ceph_mds_client *mdsc = fsc->mdsc;
2340         struct ceph_mds_request *req;
2341         int mode = USE_AUTH_MDS;
2342         int err;
2343         char *xattr_value;
2344         size_t xattr_value_len;
2345
2346         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETVXATTR, mode);
2347         if (IS_ERR(req)) {
2348                 err = -ENOMEM;
2349                 goto out;
2350         }
2351
2352         req->r_path2 = kstrdup(name, GFP_NOFS);
2353         if (!req->r_path2) {
2354                 err = -ENOMEM;
2355                 goto put;
2356         }
2357
2358         ihold(inode);
2359         req->r_inode = inode;
2360         err = ceph_mdsc_do_request(mdsc, NULL, req);
2361         if (err < 0)
2362                 goto put;
2363
2364         xattr_value = req->r_reply_info.xattr_info.xattr_value;
2365         xattr_value_len = req->r_reply_info.xattr_info.xattr_value_len;
2366
2367         dout("do_getvxattr xattr_value_len:%zu, size:%zu\n", xattr_value_len, size);
2368
2369         err = (int)xattr_value_len;
2370         if (size == 0)
2371                 goto put;
2372
2373         if (xattr_value_len > size) {
2374                 err = -ERANGE;
2375                 goto put;
2376         }
2377
2378         memcpy(value, xattr_value, xattr_value_len);
2379 put:
2380         ceph_mdsc_put_request(req);
2381 out:
2382         dout("do_getvxattr result=%d\n", err);
2383         return err;
2384 }
2385
2386
2387 /*
2388  * Check inode permissions.  We verify we have a valid value for
2389  * the AUTH cap, then call the generic handler.
2390  */
2391 int ceph_permission(struct user_namespace *mnt_userns, struct inode *inode,
2392                     int mask)
2393 {
2394         int err;
2395
2396         if (mask & MAY_NOT_BLOCK)
2397                 return -ECHILD;
2398
2399         err = ceph_do_getattr(inode, CEPH_CAP_AUTH_SHARED, false);
2400
2401         if (!err)
2402                 err = generic_permission(&init_user_ns, inode, mask);
2403         return err;
2404 }
2405
2406 /* Craft a mask of needed caps given a set of requested statx attrs. */
2407 static int statx_to_caps(u32 want, umode_t mode)
2408 {
2409         int mask = 0;
2410
2411         if (want & (STATX_MODE|STATX_UID|STATX_GID|STATX_CTIME|STATX_BTIME))
2412                 mask |= CEPH_CAP_AUTH_SHARED;
2413
2414         if (want & (STATX_NLINK|STATX_CTIME)) {
2415                 /*
2416                  * The link count for directories depends on inode->i_subdirs,
2417                  * and that is only updated when Fs caps are held.
2418                  */
2419                 if (S_ISDIR(mode))
2420                         mask |= CEPH_CAP_FILE_SHARED;
2421                 else
2422                         mask |= CEPH_CAP_LINK_SHARED;
2423         }
2424
2425         if (want & (STATX_ATIME|STATX_MTIME|STATX_CTIME|STATX_SIZE|
2426                     STATX_BLOCKS))
2427                 mask |= CEPH_CAP_FILE_SHARED;
2428
2429         if (want & (STATX_CTIME))
2430                 mask |= CEPH_CAP_XATTR_SHARED;
2431
2432         return mask;
2433 }
2434
2435 /*
2436  * Get all the attributes. If we have sufficient caps for the requested attrs,
2437  * then we can avoid talking to the MDS at all.
2438  */
2439 int ceph_getattr(struct user_namespace *mnt_userns, const struct path *path,
2440                  struct kstat *stat, u32 request_mask, unsigned int flags)
2441 {
2442         struct inode *inode = d_inode(path->dentry);
2443         struct ceph_inode_info *ci = ceph_inode(inode);
2444         u32 valid_mask = STATX_BASIC_STATS;
2445         int err = 0;
2446
2447         if (ceph_inode_is_shutdown(inode))
2448                 return -ESTALE;
2449
2450         /* Skip the getattr altogether if we're asked not to sync */
2451         if ((flags & AT_STATX_SYNC_TYPE) != AT_STATX_DONT_SYNC) {
2452                 err = ceph_do_getattr(inode,
2453                                 statx_to_caps(request_mask, inode->i_mode),
2454                                 flags & AT_STATX_FORCE_SYNC);
2455                 if (err)
2456                         return err;
2457         }
2458
2459         generic_fillattr(&init_user_ns, inode, stat);
2460         stat->ino = ceph_present_inode(inode);
2461
2462         /*
2463          * btime on newly-allocated inodes is 0, so if this is still set to
2464          * that, then assume that it's not valid.
2465          */
2466         if (ci->i_btime.tv_sec || ci->i_btime.tv_nsec) {
2467                 stat->btime = ci->i_btime;
2468                 valid_mask |= STATX_BTIME;
2469         }
2470
2471         if (ceph_snap(inode) == CEPH_NOSNAP)
2472                 stat->dev = inode->i_sb->s_dev;
2473         else
2474                 stat->dev = ci->i_snapid_map ? ci->i_snapid_map->dev : 0;
2475
2476         if (S_ISDIR(inode->i_mode)) {
2477                 if (ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb),
2478                                         RBYTES))
2479                         stat->size = ci->i_rbytes;
2480                 else
2481                         stat->size = ci->i_files + ci->i_subdirs;
2482                 stat->blocks = 0;
2483                 stat->blksize = 65536;
2484                 /*
2485                  * Some applications rely on the number of st_nlink
2486                  * value on directories to be either 0 (if unlinked)
2487                  * or 2 + number of subdirectories.
2488                  */
2489                 if (stat->nlink == 1)
2490                         /* '.' + '..' + subdirs */
2491                         stat->nlink = 1 + 1 + ci->i_subdirs;
2492         }
2493
2494         stat->result_mask = request_mask & valid_mask;
2495         return err;
2496 }
2497
2498 void ceph_inode_shutdown(struct inode *inode)
2499 {
2500         struct ceph_inode_info *ci = ceph_inode(inode);
2501         struct rb_node *p;
2502         int iputs = 0;
2503         bool invalidate = false;
2504
2505         spin_lock(&ci->i_ceph_lock);
2506         ci->i_ceph_flags |= CEPH_I_SHUTDOWN;
2507         p = rb_first(&ci->i_caps);
2508         while (p) {
2509                 struct ceph_cap *cap = rb_entry(p, struct ceph_cap, ci_node);
2510
2511                 p = rb_next(p);
2512                 iputs += ceph_purge_inode_cap(inode, cap, &invalidate);
2513         }
2514         spin_unlock(&ci->i_ceph_lock);
2515
2516         if (invalidate)
2517                 ceph_queue_invalidate(inode);
2518         while (iputs--)
2519                 iput(inode);
2520 }