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 #include <linux/fscrypt.h>
  18
  19 #include "super.h"
  20 #include "mds_client.h"
  21 #include "cache.h"
  22 #include "crypto.h"
  23 #include <linux/ceph/decode.h>
  24
  25 /*
  26  * Ceph inode operations
  27  *
  28  * Implement basic inode helpers (get, alloc) and inode ops (getattr,
  29  * setattr, etc.), xattr helpers, and helpers for assimilating
  30  * metadata returned by the MDS into our cache.
  31  *
  32  * Also define helpers for doing asynchronous writeback, invalidation,
  33  * and truncation for the benefit of those who can't afford to block
  34  * (typically because they are in the message handler path).
  35  */
  36
  37 static const struct inode_operations ceph_symlink_iops;
  38 static const struct inode_operations ceph_encrypted_symlink_iops;
  39
  40 static void ceph_inode_work(struct work_struct *work);
  41
  42 /*
  43  * find or create an inode, given the ceph ino number
  44  */
  45 static int ceph_set_ino_cb(struct inode *inode, void *data)
  46 {
  47         struct ceph_inode_info *ci = ceph_inode(inode);
  48         struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb);
  49
  50         ci->i_vino = *(struct ceph_vino *)data;
  51         inode->i_ino = ceph_vino_to_ino_t(ci->i_vino);
  52         inode_set_iversion_raw(inode, 0);
  53         percpu_counter_inc(&mdsc->metric.total_inodes);
  54
  55         return 0;
  56 }
  57
  58 /**
  59  * ceph_new_inode - allocate a new inode in advance of an expected create
  60  * @dir: parent directory for new inode
  61  * @dentry: dentry that may eventually point to new inode
  62  * @mode: mode of new inode
  63  * @as_ctx: pointer to inherited security context
  64  *
  65  * Allocate a new inode in advance of an operation to create a new inode.
  66  * This allocates the inode and sets up the acl_sec_ctx with appropriate
  67  * info for the new inode.
  68  *
  69  * Returns a pointer to the new inode or an ERR_PTR.
  70  */
  71 struct inode *ceph_new_inode(struct inode *dir, struct dentry *dentry,
  72                              umode_t *mode, struct ceph_acl_sec_ctx *as_ctx)
  73 {
  74         int err;
  75         struct inode *inode;
  76
  77         inode = new_inode(dir->i_sb);
  78         if (!inode)
  79                 return ERR_PTR(-ENOMEM);
  80
  81         if (!S_ISLNK(*mode)) {
  82                 err = ceph_pre_init_acls(dir, mode, as_ctx);
  83                 if (err < 0)
  84                         goto out_err;
  85         }
  86
  87         inode->i_state = 0;
  88         inode->i_mode = *mode;
  89
  90         err = ceph_security_init_secctx(dentry, *mode, as_ctx);
  91         if (err < 0)
  92                 goto out_err;
  93
  94         /*
  95          * We'll skip setting fscrypt context for snapshots, leaving that for
  96          * the handle_reply().
  97          */
  98         if (ceph_snap(dir) != CEPH_SNAPDIR) {
  99                 err = ceph_fscrypt_prepare_context(dir, inode, as_ctx);
 100                 if (err)
 101                         goto out_err;
 102         }
 103
 104         return inode;
 105 out_err:
 106         iput(inode);
 107         return ERR_PTR(err);
 108 }
 109
 110 void ceph_as_ctx_to_req(struct ceph_mds_request *req,
 111                         struct ceph_acl_sec_ctx *as_ctx)
 112 {
 113         if (as_ctx->pagelist) {
 114                 req->r_pagelist = as_ctx->pagelist;
 115                 as_ctx->pagelist = NULL;
 116         }
 117         ceph_fscrypt_as_ctx_to_req(req, as_ctx);
 118 }
 119
 120 /**
 121  * ceph_get_inode - find or create/hash a new inode
 122  * @sb: superblock to search and allocate in
 123  * @vino: vino to search for
 124  * @newino: optional new inode to insert if one isn't found (may be NULL)
 125  *
 126  * Search for or insert a new inode into the hash for the given vino, and
 127  * return a reference to it. If new is non-NULL, its reference is consumed.
 128  */
 129 struct inode *ceph_get_inode(struct super_block *sb, struct ceph_vino vino,
 130                              struct inode *newino)
 131 {
 132         struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(sb);
 133         struct ceph_client *cl = mdsc->fsc->client;
 134         struct inode *inode;
 135
 136         if (ceph_vino_is_reserved(vino))
 137                 return ERR_PTR(-EREMOTEIO);
 138
 139         if (newino) {
 140                 inode = inode_insert5(newino, (unsigned long)vino.ino,
 141                                       ceph_ino_compare, ceph_set_ino_cb, &vino);
 142                 if (inode != newino)
 143                         iput(newino);
 144         } else {
 145                 inode = iget5_locked(sb, (unsigned long)vino.ino,
 146                                      ceph_ino_compare, ceph_set_ino_cb, &vino);
 147         }
 148
 149         if (!inode) {
 150                 doutc(cl, "no inode found for %llx.%llx\n", vino.ino, vino.snap);
 151                 return ERR_PTR(-ENOMEM);
 152         }
 153
 154         doutc(cl, "on %llx=%llx.%llx got %p new %d\n",
 155               ceph_present_inode(inode), ceph_vinop(inode), inode,
 156               !!(inode->i_state & I_NEW));
 157         return inode;
 158 }
 159
 160 /*
 161  * get/constuct snapdir inode for a given directory
 162  */
 163 struct inode *ceph_get_snapdir(struct inode *parent)
 164 {
 165         struct ceph_client *cl = ceph_inode_to_client(parent);
 166         struct ceph_vino vino = {
 167                 .ino = ceph_ino(parent),
 168                 .snap = CEPH_SNAPDIR,
 169         };
 170         struct inode *inode = ceph_get_inode(parent->i_sb, vino, NULL);
 171         struct ceph_inode_info *ci = ceph_inode(inode);
 172         int ret = -ENOTDIR;
 173
 174         if (IS_ERR(inode))
 175                 return inode;
 176
 177         if (!S_ISDIR(parent->i_mode)) {
 178                 pr_warn_once_client(cl, "bad snapdir parent type (mode=0%o)\n",
 179                                     parent->i_mode);
 180                 goto err;
 181         }
 182
 183         if (!(inode->i_state & I_NEW) && !S_ISDIR(inode->i_mode)) {
 184                 pr_warn_once_client(cl, "bad snapdir inode type (mode=0%o)\n",
 185                                     inode->i_mode);
 186                 goto err;
 187         }
 188
 189         inode->i_mode = parent->i_mode;
 190         inode->i_uid = parent->i_uid;
 191         inode->i_gid = parent->i_gid;
 192         inode->i_mtime = parent->i_mtime;
 193         inode_set_ctime_to_ts(inode, inode_get_ctime(parent));
 194         inode->i_atime = parent->i_atime;
 195         ci->i_rbytes = 0;
 196         ci->i_btime = ceph_inode(parent)->i_btime;
 197
 198 #ifdef CONFIG_FS_ENCRYPTION
 199         /* if encrypted, just borrow fscrypt_auth from parent */
 200         if (IS_ENCRYPTED(parent)) {
 201                 struct ceph_inode_info *pci = ceph_inode(parent);
 202
 203                 ci->fscrypt_auth = kmemdup(pci->fscrypt_auth,
 204                                            pci->fscrypt_auth_len,
 205                                            GFP_KERNEL);
 206                 if (ci->fscrypt_auth) {
 207                         inode->i_flags |= S_ENCRYPTED;
 208                         ci->fscrypt_auth_len = pci->fscrypt_auth_len;
 209                 } else {
 210                         doutc(cl, "Failed to alloc snapdir fscrypt_auth\n");
 211                         ret = -ENOMEM;
 212                         goto err;
 213                 }
 214         }
 215 #endif
 216         if (inode->i_state & I_NEW) {
 217                 inode->i_op = &ceph_snapdir_iops;
 218                 inode->i_fop = &ceph_snapdir_fops;
 219                 ci->i_snap_caps = CEPH_CAP_PIN; /* so we can open */
 220                 unlock_new_inode(inode);
 221         }
 222
 223         return inode;
 224 err:
 225         if ((inode->i_state & I_NEW))
 226                 discard_new_inode(inode);
 227         else
 228                 iput(inode);
 229         return ERR_PTR(ret);
 230 }
 231
 232 const struct inode_operations ceph_file_iops = {
 233         .permission = ceph_permission,
 234         .setattr = ceph_setattr,
 235         .getattr = ceph_getattr,
 236         .listxattr = ceph_listxattr,
 237         .get_inode_acl = ceph_get_acl,
 238         .set_acl = ceph_set_acl,
 239 };
 240
 241
 242 /*
 243  * We use a 'frag tree' to keep track of the MDS's directory fragments
 244  * for a given inode (usually there is just a single fragment).  We
 245  * need to know when a child frag is delegated to a new MDS, or when
 246  * it is flagged as replicated, so we can direct our requests
 247  * accordingly.
 248  */
 249
 250 /*
 251  * find/create a frag in the tree
 252  */
 253 static struct ceph_inode_frag *__get_or_create_frag(struct ceph_inode_info *ci,
 254                                                     u32 f)
 255 {
 256         struct inode *inode = &ci->netfs.inode;
 257         struct ceph_client *cl = ceph_inode_to_client(inode);
 258         struct rb_node **p;
 259         struct rb_node *parent = NULL;
 260         struct ceph_inode_frag *frag;
 261         int c;
 262
 263         p = &ci->i_fragtree.rb_node;
 264         while (*p) {
 265                 parent = *p;
 266                 frag = rb_entry(parent, struct ceph_inode_frag, node);
 267                 c = ceph_frag_compare(f, frag->frag);
 268                 if (c < 0)
 269                         p = &(*p)->rb_left;
 270                 else if (c > 0)
 271                         p = &(*p)->rb_right;
 272                 else
 273                         return frag;
 274         }
 275
 276         frag = kmalloc(sizeof(*frag), GFP_NOFS);
 277         if (!frag)
 278                 return ERR_PTR(-ENOMEM);
 279
 280         frag->frag = f;
 281         frag->split_by = 0;
 282         frag->mds = -1;
 283         frag->ndist = 0;
 284
 285         rb_link_node(&frag->node, parent, p);
 286         rb_insert_color(&frag->node, &ci->i_fragtree);
 287
 288         doutc(cl, "added %p %llx.%llx frag %x\n", inode, ceph_vinop(inode), f);
 289         return frag;
 290 }
 291
 292 /*
 293  * find a specific frag @f
 294  */
 295 struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci, u32 f)
 296 {
 297         struct rb_node *n = ci->i_fragtree.rb_node;
 298
 299         while (n) {
 300                 struct ceph_inode_frag *frag =
 301                         rb_entry(n, struct ceph_inode_frag, node);
 302                 int c = ceph_frag_compare(f, frag->frag);
 303                 if (c < 0)
 304                         n = n->rb_left;
 305                 else if (c > 0)
 306                         n = n->rb_right;
 307                 else
 308                         return frag;
 309         }
 310         return NULL;
 311 }
 312
 313 /*
 314  * Choose frag containing the given value @v.  If @pfrag is
 315  * specified, copy the frag delegation info to the caller if
 316  * it is present.
 317  */
 318 static u32 __ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
 319                               struct ceph_inode_frag *pfrag, int *found)
 320 {
 321         struct ceph_client *cl = ceph_inode_to_client(&ci->netfs.inode);
 322         u32 t = ceph_frag_make(0, 0);
 323         struct ceph_inode_frag *frag;
 324         unsigned nway, i;
 325         u32 n;
 326
 327         if (found)
 328                 *found = 0;
 329
 330         while (1) {
 331                 WARN_ON(!ceph_frag_contains_value(t, v));
 332                 frag = __ceph_find_frag(ci, t);
 333                 if (!frag)
 334                         break; /* t is a leaf */
 335                 if (frag->split_by == 0) {
 336                         if (pfrag)
 337                                 memcpy(pfrag, frag, sizeof(*pfrag));
 338                         if (found)
 339                                 *found = 1;
 340                         break;
 341                 }
 342
 343                 /* choose child */
 344                 nway = 1 << frag->split_by;
 345                 doutc(cl, "frag(%x) %x splits by %d (%d ways)\n", v, t,
 346                       frag->split_by, nway);
 347                 for (i = 0; i < nway; i++) {
 348                         n = ceph_frag_make_child(t, frag->split_by, i);
 349                         if (ceph_frag_contains_value(n, v)) {
 350                                 t = n;
 351                                 break;
 352                         }
 353                 }
 354                 BUG_ON(i == nway);
 355         }
 356         doutc(cl, "frag(%x) = %x\n", v, t);
 357
 358         return t;
 359 }
 360
 361 u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
 362                      struct ceph_inode_frag *pfrag, int *found)
 363 {
 364         u32 ret;
 365         mutex_lock(&ci->i_fragtree_mutex);
 366         ret = __ceph_choose_frag(ci, v, pfrag, found);
 367         mutex_unlock(&ci->i_fragtree_mutex);
 368         return ret;
 369 }
 370
 371 /*
 372  * Process dirfrag (delegation) info from the mds.  Include leaf
 373  * fragment in tree ONLY if ndist > 0.  Otherwise, only
 374  * branches/splits are included in i_fragtree)
 375  */
 376 static int ceph_fill_dirfrag(struct inode *inode,
 377                              struct ceph_mds_reply_dirfrag *dirinfo)
 378 {
 379         struct ceph_inode_info *ci = ceph_inode(inode);
 380         struct ceph_client *cl = ceph_inode_to_client(inode);
 381         struct ceph_inode_frag *frag;
 382         u32 id = le32_to_cpu(dirinfo->frag);
 383         int mds = le32_to_cpu(dirinfo->auth);
 384         int ndist = le32_to_cpu(dirinfo->ndist);
 385         int diri_auth = -1;
 386         int i;
 387         int err = 0;
 388
 389         spin_lock(&ci->i_ceph_lock);
 390         if (ci->i_auth_cap)
 391                 diri_auth = ci->i_auth_cap->mds;
 392         spin_unlock(&ci->i_ceph_lock);
 393
 394         if (mds == -1) /* CDIR_AUTH_PARENT */
 395                 mds = diri_auth;
 396
 397         mutex_lock(&ci->i_fragtree_mutex);
 398         if (ndist == 0 && mds == diri_auth) {
 399                 /* no delegation info needed. */
 400                 frag = __ceph_find_frag(ci, id);
 401                 if (!frag)
 402                         goto out;
 403                 if (frag->split_by == 0) {
 404                         /* tree leaf, remove */
 405                         doutc(cl, "removed %p %llx.%llx frag %x (no ref)\n",
 406                               inode, ceph_vinop(inode), id);
 407                         rb_erase(&frag->node, &ci->i_fragtree);
 408                         kfree(frag);
 409                 } else {
 410                         /* tree branch, keep and clear */
 411                         doutc(cl, "cleared %p %llx.%llx frag %x referral\n",
 412                               inode, ceph_vinop(inode), id);
 413                         frag->mds = -1;
 414                         frag->ndist = 0;
 415                 }
 416                 goto out;
 417         }
 418
 419
 420         /* find/add this frag to store mds delegation info */
 421         frag = __get_or_create_frag(ci, id);
 422         if (IS_ERR(frag)) {
 423                 /* this is not the end of the world; we can continue
 424                    with bad/inaccurate delegation info */
 425                 pr_err_client(cl, "ENOMEM on mds ref %p %llx.%llx fg %x\n",
 426                               inode, ceph_vinop(inode),
 427                               le32_to_cpu(dirinfo->frag));
 428                 err = -ENOMEM;
 429                 goto out;
 430         }
 431
 432         frag->mds = mds;
 433         frag->ndist = min_t(u32, ndist, CEPH_MAX_DIRFRAG_REP);
 434         for (i = 0; i < frag->ndist; i++)
 435                 frag->dist[i] = le32_to_cpu(dirinfo->dist[i]);
 436         doutc(cl, "%p %llx.%llx frag %x ndist=%d\n", inode,
 437               ceph_vinop(inode), frag->frag, frag->ndist);
 438
 439 out:
 440         mutex_unlock(&ci->i_fragtree_mutex);
 441         return err;
 442 }
 443
 444 static int frag_tree_split_cmp(const void *l, const void *r)
 445 {
 446         struct ceph_frag_tree_split *ls = (struct ceph_frag_tree_split*)l;
 447         struct ceph_frag_tree_split *rs = (struct ceph_frag_tree_split*)r;
 448         return ceph_frag_compare(le32_to_cpu(ls->frag),
 449                                  le32_to_cpu(rs->frag));
 450 }
 451
 452 static bool is_frag_child(u32 f, struct ceph_inode_frag *frag)
 453 {
 454         if (!frag)
 455                 return f == ceph_frag_make(0, 0);
 456         if (ceph_frag_bits(f) != ceph_frag_bits(frag->frag) + frag->split_by)
 457                 return false;
 458         return ceph_frag_contains_value(frag->frag, ceph_frag_value(f));
 459 }
 460
 461 static int ceph_fill_fragtree(struct inode *inode,
 462                               struct ceph_frag_tree_head *fragtree,
 463                               struct ceph_mds_reply_dirfrag *dirinfo)
 464 {
 465         struct ceph_client *cl = ceph_inode_to_client(inode);
 466         struct ceph_inode_info *ci = ceph_inode(inode);
 467         struct ceph_inode_frag *frag, *prev_frag = NULL;
 468         struct rb_node *rb_node;
 469         unsigned i, split_by, nsplits;
 470         u32 id;
 471         bool update = false;
 472
 473         mutex_lock(&ci->i_fragtree_mutex);
 474         nsplits = le32_to_cpu(fragtree->nsplits);
 475         if (nsplits != ci->i_fragtree_nsplits) {
 476                 update = true;
 477         } else if (nsplits) {
 478                 i = get_random_u32_below(nsplits);
 479                 id = le32_to_cpu(fragtree->splits[i].frag);
 480                 if (!__ceph_find_frag(ci, id))
 481                         update = true;
 482         } else if (!RB_EMPTY_ROOT(&ci->i_fragtree)) {
 483                 rb_node = rb_first(&ci->i_fragtree);
 484                 frag = rb_entry(rb_node, struct ceph_inode_frag, node);
 485                 if (frag->frag != ceph_frag_make(0, 0) || rb_next(rb_node))
 486                         update = true;
 487         }
 488         if (!update && dirinfo) {
 489                 id = le32_to_cpu(dirinfo->frag);
 490                 if (id != __ceph_choose_frag(ci, id, NULL, NULL))
 491                         update = true;
 492         }
 493         if (!update)
 494                 goto out_unlock;
 495
 496         if (nsplits > 1) {
 497                 sort(fragtree->splits, nsplits, sizeof(fragtree->splits[0]),
 498                      frag_tree_split_cmp, NULL);
 499         }
 500
 501         doutc(cl, "%p %llx.%llx\n", inode, ceph_vinop(inode));
 502         rb_node = rb_first(&ci->i_fragtree);
 503         for (i = 0; i < nsplits; i++) {
 504                 id = le32_to_cpu(fragtree->splits[i].frag);
 505                 split_by = le32_to_cpu(fragtree->splits[i].by);
 506                 if (split_by == 0 || ceph_frag_bits(id) + split_by > 24) {
 507                         pr_err_client(cl, "%p %llx.%llx invalid split %d/%u, "
 508                                "frag %x split by %d\n", inode,
 509                                ceph_vinop(inode), i, nsplits, id, split_by);
 510                         continue;
 511                 }
 512                 frag = NULL;
 513                 while (rb_node) {
 514                         frag = rb_entry(rb_node, struct ceph_inode_frag, node);
 515                         if (ceph_frag_compare(frag->frag, id) >= 0) {
 516                                 if (frag->frag != id)
 517                                         frag = NULL;
 518                                 else
 519                                         rb_node = rb_next(rb_node);
 520                                 break;
 521                         }
 522                         rb_node = rb_next(rb_node);
 523                         /* delete stale split/leaf node */
 524                         if (frag->split_by > 0 ||
 525                             !is_frag_child(frag->frag, prev_frag)) {
 526                                 rb_erase(&frag->node, &ci->i_fragtree);
 527                                 if (frag->split_by > 0)
 528                                         ci->i_fragtree_nsplits--;
 529                                 kfree(frag);
 530                         }
 531                         frag = NULL;
 532                 }
 533                 if (!frag) {
 534                         frag = __get_or_create_frag(ci, id);
 535                         if (IS_ERR(frag))
 536                                 continue;
 537                 }
 538                 if (frag->split_by == 0)
 539                         ci->i_fragtree_nsplits++;
 540                 frag->split_by = split_by;
 541                 doutc(cl, " frag %x split by %d\n", frag->frag, frag->split_by);
 542                 prev_frag = frag;
 543         }
 544         while (rb_node) {
 545                 frag = rb_entry(rb_node, struct ceph_inode_frag, node);
 546                 rb_node = rb_next(rb_node);
 547                 /* delete stale split/leaf node */
 548                 if (frag->split_by > 0 ||
 549                     !is_frag_child(frag->frag, prev_frag)) {
 550                         rb_erase(&frag->node, &ci->i_fragtree);
 551                         if (frag->split_by > 0)
 552                                 ci->i_fragtree_nsplits--;
 553                         kfree(frag);
 554                 }
 555         }
 556 out_unlock:
 557         mutex_unlock(&ci->i_fragtree_mutex);
 558         return 0;
 559 }
 560
 561 /*
 562  * initialize a newly allocated inode.
 563  */
 564 struct inode *ceph_alloc_inode(struct super_block *sb)
 565 {
 566         struct ceph_fs_client *fsc = ceph_sb_to_fs_client(sb);
 567         struct ceph_inode_info *ci;
 568         int i;
 569
 570         ci = alloc_inode_sb(sb, ceph_inode_cachep, GFP_NOFS);
 571         if (!ci)
 572                 return NULL;
 573
 574         doutc(fsc->client, "%p\n", &ci->netfs.inode);
 575
 576         /* Set parameters for the netfs library */
 577         netfs_inode_init(&ci->netfs, &ceph_netfs_ops);
 578
 579         spin_lock_init(&ci->i_ceph_lock);
 580
 581         ci->i_version = 0;
 582         ci->i_inline_version = 0;
 583         ci->i_time_warp_seq = 0;
 584         ci->i_ceph_flags = 0;
 585         atomic64_set(&ci->i_ordered_count, 1);
 586         atomic64_set(&ci->i_release_count, 1);
 587         atomic64_set(&ci->i_complete_seq[0], 0);
 588         atomic64_set(&ci->i_complete_seq[1], 0);
 589         ci->i_symlink = NULL;
 590
 591         ci->i_max_bytes = 0;
 592         ci->i_max_files = 0;
 593
 594         memset(&ci->i_dir_layout, 0, sizeof(ci->i_dir_layout));
 595         memset(&ci->i_cached_layout, 0, sizeof(ci->i_cached_layout));
 596         RCU_INIT_POINTER(ci->i_layout.pool_ns, NULL);
 597
 598         ci->i_fragtree = RB_ROOT;
 599         mutex_init(&ci->i_fragtree_mutex);
 600
 601         ci->i_xattrs.blob = NULL;
 602         ci->i_xattrs.prealloc_blob = NULL;
 603         ci->i_xattrs.dirty = false;
 604         ci->i_xattrs.index = RB_ROOT;
 605         ci->i_xattrs.count = 0;
 606         ci->i_xattrs.names_size = 0;
 607         ci->i_xattrs.vals_size = 0;
 608         ci->i_xattrs.version = 0;
 609         ci->i_xattrs.index_version = 0;
 610
 611         ci->i_caps = RB_ROOT;
 612         ci->i_auth_cap = NULL;
 613         ci->i_dirty_caps = 0;
 614         ci->i_flushing_caps = 0;
 615         INIT_LIST_HEAD(&ci->i_dirty_item);
 616         INIT_LIST_HEAD(&ci->i_flushing_item);
 617         ci->i_prealloc_cap_flush = NULL;
 618         INIT_LIST_HEAD(&ci->i_cap_flush_list);
 619         init_waitqueue_head(&ci->i_cap_wq);
 620         ci->i_hold_caps_max = 0;
 621         INIT_LIST_HEAD(&ci->i_cap_delay_list);
 622         INIT_LIST_HEAD(&ci->i_cap_snaps);
 623         ci->i_head_snapc = NULL;
 624         ci->i_snap_caps = 0;
 625
 626         ci->i_last_rd = ci->i_last_wr = jiffies - 3600 * HZ;
 627         for (i = 0; i < CEPH_FILE_MODE_BITS; i++)
 628                 ci->i_nr_by_mode[i] = 0;
 629
 630         mutex_init(&ci->i_truncate_mutex);
 631         ci->i_truncate_seq = 0;
 632         ci->i_truncate_size = 0;
 633         ci->i_truncate_pending = 0;
 634         ci->i_truncate_pagecache_size = 0;
 635
 636         ci->i_max_size = 0;
 637         ci->i_reported_size = 0;
 638         ci->i_wanted_max_size = 0;
 639         ci->i_requested_max_size = 0;
 640
 641         ci->i_pin_ref = 0;
 642         ci->i_rd_ref = 0;
 643         ci->i_rdcache_ref = 0;
 644         ci->i_wr_ref = 0;
 645         ci->i_wb_ref = 0;
 646         ci->i_fx_ref = 0;
 647         ci->i_wrbuffer_ref = 0;
 648         ci->i_wrbuffer_ref_head = 0;
 649         atomic_set(&ci->i_filelock_ref, 0);
 650         atomic_set(&ci->i_shared_gen, 1);
 651         ci->i_rdcache_gen = 0;
 652         ci->i_rdcache_revoking = 0;
 653
 654         INIT_LIST_HEAD(&ci->i_unsafe_dirops);
 655         INIT_LIST_HEAD(&ci->i_unsafe_iops);
 656         spin_lock_init(&ci->i_unsafe_lock);
 657
 658         ci->i_snap_realm = NULL;
 659         INIT_LIST_HEAD(&ci->i_snap_realm_item);
 660         INIT_LIST_HEAD(&ci->i_snap_flush_item);
 661
 662         INIT_WORK(&ci->i_work, ceph_inode_work);
 663         ci->i_work_mask = 0;
 664         memset(&ci->i_btime, '\0', sizeof(ci->i_btime));
 665 #ifdef CONFIG_FS_ENCRYPTION
 666         ci->fscrypt_auth = NULL;
 667         ci->fscrypt_auth_len = 0;
 668 #endif
 669         return &ci->netfs.inode;
 670 }
 671
 672 void ceph_free_inode(struct inode *inode)
 673 {
 674         struct ceph_inode_info *ci = ceph_inode(inode);
 675
 676         kfree(ci->i_symlink);
 677 #ifdef CONFIG_FS_ENCRYPTION
 678         kfree(ci->fscrypt_auth);
 679 #endif
 680         fscrypt_free_inode(inode);
 681         kmem_cache_free(ceph_inode_cachep, ci);
 682 }
 683
 684 void ceph_evict_inode(struct inode *inode)
 685 {
 686         struct ceph_inode_info *ci = ceph_inode(inode);
 687         struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb);
 688         struct ceph_client *cl = ceph_inode_to_client(inode);
 689         struct ceph_inode_frag *frag;
 690         struct rb_node *n;
 691
 692         doutc(cl, "%p ino %llx.%llx\n", inode, ceph_vinop(inode));
 693
 694         percpu_counter_dec(&mdsc->metric.total_inodes);
 695
 696         truncate_inode_pages_final(&inode->i_data);
 697         if (inode->i_state & I_PINNING_FSCACHE_WB)
 698                 ceph_fscache_unuse_cookie(inode, true);
 699         clear_inode(inode);
 700
 701         ceph_fscache_unregister_inode_cookie(ci);
 702         fscrypt_put_encryption_info(inode);
 703
 704         __ceph_remove_caps(ci);
 705
 706         if (__ceph_has_quota(ci, QUOTA_GET_ANY))
 707                 ceph_adjust_quota_realms_count(inode, false);
 708
 709         /*
 710          * we may still have a snap_realm reference if there are stray
 711          * caps in i_snap_caps.
 712          */
 713         if (ci->i_snap_realm) {
 714                 if (ceph_snap(inode) == CEPH_NOSNAP) {
 715                         doutc(cl, " dropping residual ref to snap realm %p\n",
 716                               ci->i_snap_realm);
 717                         ceph_change_snap_realm(inode, NULL);
 718                 } else {
 719                         ceph_put_snapid_map(mdsc, ci->i_snapid_map);
 720                         ci->i_snap_realm = NULL;
 721                 }
 722         }
 723
 724         while ((n = rb_first(&ci->i_fragtree)) != NULL) {
 725                 frag = rb_entry(n, struct ceph_inode_frag, node);
 726                 rb_erase(n, &ci->i_fragtree);
 727                 kfree(frag);
 728         }
 729         ci->i_fragtree_nsplits = 0;
 730
 731         __ceph_destroy_xattrs(ci);
 732         if (ci->i_xattrs.blob)
 733                 ceph_buffer_put(ci->i_xattrs.blob);
 734         if (ci->i_xattrs.prealloc_blob)
 735                 ceph_buffer_put(ci->i_xattrs.prealloc_blob);
 736
 737         ceph_put_string(rcu_dereference_raw(ci->i_layout.pool_ns));
 738         ceph_put_string(rcu_dereference_raw(ci->i_cached_layout.pool_ns));
 739 }
 740
 741 static inline blkcnt_t calc_inode_blocks(u64 size)
 742 {
 743         return (size + (1<<9) - 1) >> 9;
 744 }
 745
 746 /*
 747  * Helpers to fill in size, ctime, mtime, and atime.  We have to be
 748  * careful because either the client or MDS may have more up to date
 749  * info, depending on which capabilities are held, and whether
 750  * time_warp_seq or truncate_seq have increased.  (Ordinarily, mtime
 751  * and size are monotonically increasing, except when utimes() or
 752  * truncate() increments the corresponding _seq values.)
 753  */
 754 int ceph_fill_file_size(struct inode *inode, int issued,
 755                         u32 truncate_seq, u64 truncate_size, u64 size)
 756 {
 757         struct ceph_client *cl = ceph_inode_to_client(inode);
 758         struct ceph_inode_info *ci = ceph_inode(inode);
 759         int queue_trunc = 0;
 760         loff_t isize = i_size_read(inode);
 761
 762         if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) > 0 ||
 763             (truncate_seq == ci->i_truncate_seq && size > isize)) {
 764                 doutc(cl, "size %lld -> %llu\n", isize, size);
 765                 if (size > 0 && S_ISDIR(inode->i_mode)) {
 766                         pr_err_client(cl, "non-zero size for directory\n");
 767                         size = 0;
 768                 }
 769                 i_size_write(inode, size);
 770                 inode->i_blocks = calc_inode_blocks(size);
 771                 /*
 772                  * If we're expanding, then we should be able to just update
 773                  * the existing cookie.
 774                  */
 775                 if (size > isize)
 776                         ceph_fscache_update(inode);
 777                 ci->i_reported_size = size;
 778                 if (truncate_seq != ci->i_truncate_seq) {
 779                         doutc(cl, "truncate_seq %u -> %u\n",
 780                               ci->i_truncate_seq, truncate_seq);
 781                         ci->i_truncate_seq = truncate_seq;
 782
 783                         /* the MDS should have revoked these caps */
 784                         WARN_ON_ONCE(issued & (CEPH_CAP_FILE_RD |
 785                                                CEPH_CAP_FILE_LAZYIO));
 786                         /*
 787                          * If we hold relevant caps, or in the case where we're
 788                          * not the only client referencing this file and we
 789                          * don't hold those caps, then we need to check whether
 790                          * the file is either opened or mmaped
 791                          */
 792                         if ((issued & (CEPH_CAP_FILE_CACHE|
 793                                        CEPH_CAP_FILE_BUFFER)) ||
 794                             mapping_mapped(inode->i_mapping) ||
 795                             __ceph_is_file_opened(ci)) {
 796                                 ci->i_truncate_pending++;
 797                                 queue_trunc = 1;
 798                         }
 799                 }
 800         }
 801
 802         /*
 803          * It's possible that the new sizes of the two consecutive
 804          * size truncations will be in the same fscrypt last block,
 805          * and we need to truncate the corresponding page caches
 806          * anyway.
 807          */
 808         if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) >= 0) {
 809                 doutc(cl, "truncate_size %lld -> %llu, encrypted %d\n",
 810                       ci->i_truncate_size, truncate_size,
 811                       !!IS_ENCRYPTED(inode));
 812
 813                 ci->i_truncate_size = truncate_size;
 814
 815                 if (IS_ENCRYPTED(inode)) {
 816                         doutc(cl, "truncate_pagecache_size %lld -> %llu\n",
 817                               ci->i_truncate_pagecache_size, size);
 818                         ci->i_truncate_pagecache_size = size;
 819                 } else {
 820                         ci->i_truncate_pagecache_size = truncate_size;
 821                 }
 822         }
 823         return queue_trunc;
 824 }
 825
 826 void ceph_fill_file_time(struct inode *inode, int issued,
 827                          u64 time_warp_seq, struct timespec64 *ctime,
 828                          struct timespec64 *mtime, struct timespec64 *atime)
 829 {
 830         struct ceph_client *cl = ceph_inode_to_client(inode);
 831         struct ceph_inode_info *ci = ceph_inode(inode);
 832         struct timespec64 ictime = inode_get_ctime(inode);
 833         int warn = 0;
 834
 835         if (issued & (CEPH_CAP_FILE_EXCL|
 836                       CEPH_CAP_FILE_WR|
 837                       CEPH_CAP_FILE_BUFFER|
 838                       CEPH_CAP_AUTH_EXCL|
 839                       CEPH_CAP_XATTR_EXCL)) {
 840                 if (ci->i_version == 0 ||
 841                     timespec64_compare(ctime, &ictime) > 0) {
 842                         doutc(cl, "ctime %lld.%09ld -> %lld.%09ld inc w/ cap\n",
 843                              ictime.tv_sec, ictime.tv_nsec,
 844                              ctime->tv_sec, ctime->tv_nsec);
 845                         inode_set_ctime_to_ts(inode, *ctime);
 846                 }
 847                 if (ci->i_version == 0 ||
 848                     ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) > 0) {
 849                         /* the MDS did a utimes() */
 850                         doutc(cl, "mtime %lld.%09ld -> %lld.%09ld tw %d -> %d\n",
 851                               inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
 852                               mtime->tv_sec, mtime->tv_nsec,
 853                               ci->i_time_warp_seq, (int)time_warp_seq);
 854
 855                         inode->i_mtime = *mtime;
 856                         inode->i_atime = *atime;
 857                         ci->i_time_warp_seq = time_warp_seq;
 858                 } else if (time_warp_seq == ci->i_time_warp_seq) {
 859                         /* nobody did utimes(); take the max */
 860                         if (timespec64_compare(mtime, &inode->i_mtime) > 0) {
 861                                 doutc(cl, "mtime %lld.%09ld -> %lld.%09ld inc\n",
 862                                       inode->i_mtime.tv_sec,
 863                                       inode->i_mtime.tv_nsec,
 864                                       mtime->tv_sec, mtime->tv_nsec);
 865                                 inode->i_mtime = *mtime;
 866                         }
 867                         if (timespec64_compare(atime, &inode->i_atime) > 0) {
 868                                 doutc(cl, "atime %lld.%09ld -> %lld.%09ld inc\n",
 869                                       inode->i_atime.tv_sec,
 870                                       inode->i_atime.tv_nsec,
 871                                       atime->tv_sec, atime->tv_nsec);
 872                                 inode->i_atime = *atime;
 873                         }
 874                 } else if (issued & CEPH_CAP_FILE_EXCL) {
 875                         /* we did a utimes(); ignore mds values */
 876                 } else {
 877                         warn = 1;
 878                 }
 879         } else {
 880                 /* we have no write|excl caps; whatever the MDS says is true */
 881                 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) >= 0) {
 882                         inode_set_ctime_to_ts(inode, *ctime);
 883                         inode->i_mtime = *mtime;
 884                         inode->i_atime = *atime;
 885                         ci->i_time_warp_seq = time_warp_seq;
 886                 } else {
 887                         warn = 1;
 888                 }
 889         }
 890         if (warn) /* time_warp_seq shouldn't go backwards */
 891                 doutc(cl, "%p mds time_warp_seq %llu < %u\n", inode,
 892                       time_warp_seq, ci->i_time_warp_seq);
 893 }
 894
 895 #if IS_ENABLED(CONFIG_FS_ENCRYPTION)
 896 static int decode_encrypted_symlink(struct ceph_mds_client *mdsc,
 897                                     const char *encsym,
 898                                     int enclen, u8 **decsym)
 899 {
 900         struct ceph_client *cl = mdsc->fsc->client;
 901         int declen;
 902         u8 *sym;
 903
 904         sym = kmalloc(enclen + 1, GFP_NOFS);
 905         if (!sym)
 906                 return -ENOMEM;
 907
 908         declen = ceph_base64_decode(encsym, enclen, sym);
 909         if (declen < 0) {
 910                 pr_err_client(cl,
 911                         "can't decode symlink (%d). Content: %.*s\n",
 912                         declen, enclen, encsym);
 913                 kfree(sym);
 914                 return -EIO;
 915         }
 916         sym[declen + 1] = '\0';
 917         *decsym = sym;
 918         return declen;
 919 }
 920 #else
 921 static int decode_encrypted_symlink(struct ceph_mds_client *mdsc,
 922                                     const char *encsym,
 923                                     int symlen, u8 **decsym)
 924 {
 925         return -EOPNOTSUPP;
 926 }
 927 #endif
 928
 929 /*
 930  * Populate an inode based on info from mds.  May be called on new or
 931  * existing inodes.
 932  */
 933 int ceph_fill_inode(struct inode *inode, struct page *locked_page,
 934                     struct ceph_mds_reply_info_in *iinfo,
 935                     struct ceph_mds_reply_dirfrag *dirinfo,
 936                     struct ceph_mds_session *session, int cap_fmode,
 937                     struct ceph_cap_reservation *caps_reservation)
 938 {
 939         struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb);
 940         struct ceph_client *cl = mdsc->fsc->client;
 941         struct ceph_mds_reply_inode *info = iinfo->in;
 942         struct ceph_inode_info *ci = ceph_inode(inode);
 943         int issued, new_issued, info_caps;
 944         struct timespec64 mtime, atime, ctime;
 945         struct ceph_buffer *xattr_blob = NULL;
 946         struct ceph_buffer *old_blob = NULL;
 947         struct ceph_string *pool_ns = NULL;
 948         struct ceph_cap *new_cap = NULL;
 949         int err = 0;
 950         bool wake = false;
 951         bool queue_trunc = false;
 952         bool new_version = false;
 953         bool fill_inline = false;
 954         umode_t mode = le32_to_cpu(info->mode);
 955         dev_t rdev = le32_to_cpu(info->rdev);
 956
 957         lockdep_assert_held(&mdsc->snap_rwsem);
 958
 959         doutc(cl, "%p ino %llx.%llx v %llu had %llu\n", inode, ceph_vinop(inode),
 960               le64_to_cpu(info->version), ci->i_version);
 961
 962         /* Once I_NEW is cleared, we can't change type or dev numbers */
 963         if (inode->i_state & I_NEW) {
 964                 inode->i_mode = mode;
 965         } else {
 966                 if (inode_wrong_type(inode, mode)) {
 967                         pr_warn_once_client(cl,
 968                                 "inode type changed! (ino %llx.%llx is 0%o, mds says 0%o)\n",
 969                                 ceph_vinop(inode), inode->i_mode, mode);
 970                         return -ESTALE;
 971                 }
 972
 973                 if ((S_ISCHR(mode) || S_ISBLK(mode)) && inode->i_rdev != rdev) {
 974                         pr_warn_once_client(cl,
 975                                 "dev inode rdev changed! (ino %llx.%llx is %u:%u, mds says %u:%u)\n",
 976                                 ceph_vinop(inode), MAJOR(inode->i_rdev),
 977                                 MINOR(inode->i_rdev), MAJOR(rdev),
 978                                 MINOR(rdev));
 979                         return -ESTALE;
 980                 }
 981         }
 982
 983         info_caps = le32_to_cpu(info->cap.caps);
 984
 985         /* prealloc new cap struct */
 986         if (info_caps && ceph_snap(inode) == CEPH_NOSNAP) {
 987                 new_cap = ceph_get_cap(mdsc, caps_reservation);
 988                 if (!new_cap)
 989                         return -ENOMEM;
 990         }
 991
 992         /*
 993          * prealloc xattr data, if it looks like we'll need it.  only
 994          * if len > 4 (meaning there are actually xattrs; the first 4
 995          * bytes are the xattr count).
 996          */
 997         if (iinfo->xattr_len > 4) {
 998                 xattr_blob = ceph_buffer_new(iinfo->xattr_len, GFP_NOFS);
 999                 if (!xattr_blob)
1000                         pr_err_client(cl, "ENOMEM xattr blob %d bytes\n",
1001                                       iinfo->xattr_len);
1002         }
1003
1004         if (iinfo->pool_ns_len > 0)
1005                 pool_ns = ceph_find_or_create_string(iinfo->pool_ns_data,
1006                                                      iinfo->pool_ns_len);
1007
1008         if (ceph_snap(inode) != CEPH_NOSNAP && !ci->i_snapid_map)
1009                 ci->i_snapid_map = ceph_get_snapid_map(mdsc, ceph_snap(inode));
1010
1011         spin_lock(&ci->i_ceph_lock);
1012
1013         /*
1014          * provided version will be odd if inode value is projected,
1015          * even if stable.  skip the update if we have newer stable
1016          * info (ours>=theirs, e.g. due to racing mds replies), unless
1017          * we are getting projected (unstable) info (in which case the
1018          * version is odd, and we want ours>theirs).
1019          *   us   them
1020          *   2    2     skip
1021          *   3    2     skip
1022          *   3    3     update
1023          */
1024         if (ci->i_version == 0 ||
1025             ((info->cap.flags & CEPH_CAP_FLAG_AUTH) &&
1026              le64_to_cpu(info->version) > (ci->i_version & ~1)))
1027                 new_version = true;
1028
1029         /* Update change_attribute */
1030         inode_set_max_iversion_raw(inode, iinfo->change_attr);
1031
1032         __ceph_caps_issued(ci, &issued);
1033         issued |= __ceph_caps_dirty(ci);
1034         new_issued = ~issued & info_caps;
1035
1036         __ceph_update_quota(ci, iinfo->max_bytes, iinfo->max_files);
1037
1038 #ifdef CONFIG_FS_ENCRYPTION
1039         if (iinfo->fscrypt_auth_len &&
1040             ((inode->i_state & I_NEW) || (ci->fscrypt_auth_len == 0))) {
1041                 kfree(ci->fscrypt_auth);
1042                 ci->fscrypt_auth_len = iinfo->fscrypt_auth_len;
1043                 ci->fscrypt_auth = iinfo->fscrypt_auth;
1044                 iinfo->fscrypt_auth = NULL;
1045                 iinfo->fscrypt_auth_len = 0;
1046                 inode_set_flags(inode, S_ENCRYPTED, S_ENCRYPTED);
1047         }
1048 #endif
1049
1050         if ((new_version || (new_issued & CEPH_CAP_AUTH_SHARED)) &&
1051             (issued & CEPH_CAP_AUTH_EXCL) == 0) {
1052                 inode->i_mode = mode;
1053                 inode->i_uid = make_kuid(&init_user_ns, le32_to_cpu(info->uid));
1054                 inode->i_gid = make_kgid(&init_user_ns, le32_to_cpu(info->gid));
1055                 doutc(cl, "%p %llx.%llx mode 0%o uid.gid %d.%d\n", inode,
1056                       ceph_vinop(inode), inode->i_mode,
1057                       from_kuid(&init_user_ns, inode->i_uid),
1058                       from_kgid(&init_user_ns, inode->i_gid));
1059                 ceph_decode_timespec64(&ci->i_btime, &iinfo->btime);
1060                 ceph_decode_timespec64(&ci->i_snap_btime, &iinfo->snap_btime);
1061         }
1062
1063         /* directories have fl_stripe_unit set to zero */
1064         if (IS_ENCRYPTED(inode))
1065                 inode->i_blkbits = CEPH_FSCRYPT_BLOCK_SHIFT;
1066         else if (le32_to_cpu(info->layout.fl_stripe_unit))
1067                 inode->i_blkbits =
1068                         fls(le32_to_cpu(info->layout.fl_stripe_unit)) - 1;
1069         else
1070                 inode->i_blkbits = CEPH_BLOCK_SHIFT;
1071
1072         if ((new_version || (new_issued & CEPH_CAP_LINK_SHARED)) &&
1073             (issued & CEPH_CAP_LINK_EXCL) == 0)
1074                 set_nlink(inode, le32_to_cpu(info->nlink));
1075
1076         if (new_version || (new_issued & CEPH_CAP_ANY_RD)) {
1077                 /* be careful with mtime, atime, size */
1078                 ceph_decode_timespec64(&atime, &info->atime);
1079                 ceph_decode_timespec64(&mtime, &info->mtime);
1080                 ceph_decode_timespec64(&ctime, &info->ctime);
1081                 ceph_fill_file_time(inode, issued,
1082                                 le32_to_cpu(info->time_warp_seq),
1083                                 &ctime, &mtime, &atime);
1084         }
1085
1086         if (new_version || (info_caps & CEPH_CAP_FILE_SHARED)) {
1087                 ci->i_files = le64_to_cpu(info->files);
1088                 ci->i_subdirs = le64_to_cpu(info->subdirs);
1089         }
1090
1091         if (new_version ||
1092             (new_issued & (CEPH_CAP_ANY_FILE_RD | CEPH_CAP_ANY_FILE_WR))) {
1093                 u64 size = le64_to_cpu(info->size);
1094                 s64 old_pool = ci->i_layout.pool_id;
1095                 struct ceph_string *old_ns;
1096
1097                 ceph_file_layout_from_legacy(&ci->i_layout, &info->layout);
1098                 old_ns = rcu_dereference_protected(ci->i_layout.pool_ns,
1099                                         lockdep_is_held(&ci->i_ceph_lock));
1100                 rcu_assign_pointer(ci->i_layout.pool_ns, pool_ns);
1101
1102                 if (ci->i_layout.pool_id != old_pool || pool_ns != old_ns)
1103                         ci->i_ceph_flags &= ~CEPH_I_POOL_PERM;
1104
1105                 pool_ns = old_ns;
1106
1107                 if (IS_ENCRYPTED(inode) && size &&
1108                     iinfo->fscrypt_file_len == sizeof(__le64)) {
1109                         u64 fsize = __le64_to_cpu(*(__le64 *)iinfo->fscrypt_file);
1110
1111                         if (size == round_up(fsize, CEPH_FSCRYPT_BLOCK_SIZE)) {
1112                                 size = fsize;
1113                         } else {
1114                                 pr_warn_client(cl,
1115                                         "fscrypt size mismatch: size=%llu fscrypt_file=%llu, discarding fscrypt_file size.\n",
1116                                         info->size, size);
1117                         }
1118                 }
1119
1120                 queue_trunc = ceph_fill_file_size(inode, issued,
1121                                         le32_to_cpu(info->truncate_seq),
1122                                         le64_to_cpu(info->truncate_size),
1123                                         size);
1124                 /* only update max_size on auth cap */
1125                 if ((info->cap.flags & CEPH_CAP_FLAG_AUTH) &&
1126                     ci->i_max_size != le64_to_cpu(info->max_size)) {
1127                         doutc(cl, "max_size %lld -> %llu\n",
1128                             ci->i_max_size, le64_to_cpu(info->max_size));
1129                         ci->i_max_size = le64_to_cpu(info->max_size);
1130                 }
1131         }
1132
1133         /* layout and rstat are not tracked by capability, update them if
1134          * the inode info is from auth mds */
1135         if (new_version || (info->cap.flags & CEPH_CAP_FLAG_AUTH)) {
1136                 if (S_ISDIR(inode->i_mode)) {
1137                         ci->i_dir_layout = iinfo->dir_layout;
1138                         ci->i_rbytes = le64_to_cpu(info->rbytes);
1139                         ci->i_rfiles = le64_to_cpu(info->rfiles);
1140                         ci->i_rsubdirs = le64_to_cpu(info->rsubdirs);
1141                         ci->i_dir_pin = iinfo->dir_pin;
1142                         ci->i_rsnaps = iinfo->rsnaps;
1143                         ceph_decode_timespec64(&ci->i_rctime, &info->rctime);
1144                 }
1145         }
1146
1147         /* xattrs */
1148         /* note that if i_xattrs.len <= 4, i_xattrs.data will still be NULL. */
1149         if ((ci->i_xattrs.version == 0 || !(issued & CEPH_CAP_XATTR_EXCL))  &&
1150             le64_to_cpu(info->xattr_version) > ci->i_xattrs.version) {
1151                 if (ci->i_xattrs.blob)
1152                         old_blob = ci->i_xattrs.blob;
1153                 ci->i_xattrs.blob = xattr_blob;
1154                 if (xattr_blob)
1155                         memcpy(ci->i_xattrs.blob->vec.iov_base,
1156                                iinfo->xattr_data, iinfo->xattr_len);
1157                 ci->i_xattrs.version = le64_to_cpu(info->xattr_version);
1158                 ceph_forget_all_cached_acls(inode);
1159                 ceph_security_invalidate_secctx(inode);
1160                 xattr_blob = NULL;
1161         }
1162
1163         /* finally update i_version */
1164         if (le64_to_cpu(info->version) > ci->i_version)
1165                 ci->i_version = le64_to_cpu(info->version);
1166
1167         inode->i_mapping->a_ops = &ceph_aops;
1168
1169         switch (inode->i_mode & S_IFMT) {
1170         case S_IFIFO:
1171         case S_IFBLK:
1172         case S_IFCHR:
1173         case S_IFSOCK:
1174                 inode->i_blkbits = PAGE_SHIFT;
1175                 init_special_inode(inode, inode->i_mode, rdev);
1176                 inode->i_op = &ceph_file_iops;
1177                 break;
1178         case S_IFREG:
1179                 inode->i_op = &ceph_file_iops;
1180                 inode->i_fop = &ceph_file_fops;
1181                 break;
1182         case S_IFLNK:
1183                 if (!ci->i_symlink) {
1184                         u32 symlen = iinfo->symlink_len;
1185                         char *sym;
1186
1187                         spin_unlock(&ci->i_ceph_lock);
1188
1189                         if (IS_ENCRYPTED(inode)) {
1190                                 if (symlen != i_size_read(inode))
1191                                         pr_err_client(cl,
1192                                                 "%p %llx.%llx BAD symlink size %lld\n",
1193                                                 inode, ceph_vinop(inode),
1194                                                 i_size_read(inode));
1195
1196                                 err = decode_encrypted_symlink(mdsc, iinfo->symlink,
1197                                                                symlen, (u8 **)&sym);
1198                                 if (err < 0) {
1199                                         pr_err_client(cl,
1200                                                 "decoding encrypted symlink failed: %d\n",
1201                                                 err);
1202                                         goto out;
1203                                 }
1204                                 symlen = err;
1205                                 i_size_write(inode, symlen);
1206                                 inode->i_blocks = calc_inode_blocks(symlen);
1207                         } else {
1208                                 if (symlen != i_size_read(inode)) {
1209                                         pr_err_client(cl,
1210                                                 "%p %llx.%llx BAD symlink size %lld\n",
1211                                                 inode, ceph_vinop(inode),
1212                                                 i_size_read(inode));
1213                                         i_size_write(inode, symlen);
1214                                         inode->i_blocks = calc_inode_blocks(symlen);
1215                                 }
1216
1217                                 err = -ENOMEM;
1218                                 sym = kstrndup(iinfo->symlink, symlen, GFP_NOFS);
1219                                 if (!sym)
1220                                         goto out;
1221                         }
1222
1223                         spin_lock(&ci->i_ceph_lock);
1224                         if (!ci->i_symlink)
1225                                 ci->i_symlink = sym;
1226                         else
1227                                 kfree(sym); /* lost a race */
1228                 }
1229
1230                 if (IS_ENCRYPTED(inode)) {
1231                         /*
1232                          * Encrypted symlinks need to be decrypted before we can
1233                          * cache their targets in i_link. Don't touch it here.
1234                          */
1235                         inode->i_op = &ceph_encrypted_symlink_iops;
1236                 } else {
1237                         inode->i_link = ci->i_symlink;
1238                         inode->i_op = &ceph_symlink_iops;
1239                 }
1240                 break;
1241         case S_IFDIR:
1242                 inode->i_op = &ceph_dir_iops;
1243                 inode->i_fop = &ceph_dir_fops;
1244                 break;
1245         default:
1246                 pr_err_client(cl, "%p %llx.%llx BAD mode 0%o\n", inode,
1247                               ceph_vinop(inode), inode->i_mode);
1248         }
1249
1250         /* were we issued a capability? */
1251         if (info_caps) {
1252                 if (ceph_snap(inode) == CEPH_NOSNAP) {
1253                         ceph_add_cap(inode, session,
1254                                      le64_to_cpu(info->cap.cap_id),
1255                                      info_caps,
1256                                      le32_to_cpu(info->cap.wanted),
1257                                      le32_to_cpu(info->cap.seq),
1258                                      le32_to_cpu(info->cap.mseq),
1259                                      le64_to_cpu(info->cap.realm),
1260                                      info->cap.flags, &new_cap);
1261
1262                         /* set dir completion flag? */
1263                         if (S_ISDIR(inode->i_mode) &&
1264                             ci->i_files == 0 && ci->i_subdirs == 0 &&
1265                             (info_caps & CEPH_CAP_FILE_SHARED) &&
1266                             (issued & CEPH_CAP_FILE_EXCL) == 0 &&
1267                             !__ceph_dir_is_complete(ci)) {
1268                                 doutc(cl, " marking %p complete (empty)\n",
1269                                       inode);
1270                                 i_size_write(inode, 0);
1271                                 __ceph_dir_set_complete(ci,
1272                                         atomic64_read(&ci->i_release_count),
1273                                         atomic64_read(&ci->i_ordered_count));
1274                         }
1275
1276                         wake = true;
1277                 } else {
1278                         doutc(cl, " %p got snap_caps %s\n", inode,
1279                               ceph_cap_string(info_caps));
1280                         ci->i_snap_caps |= info_caps;
1281                 }
1282         }
1283
1284         if (iinfo->inline_version > 0 &&
1285             iinfo->inline_version >= ci->i_inline_version) {
1286                 int cache_caps = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO;
1287                 ci->i_inline_version = iinfo->inline_version;
1288                 if (ceph_has_inline_data(ci) &&
1289                     (locked_page || (info_caps & cache_caps)))
1290                         fill_inline = true;
1291         }
1292
1293         if (cap_fmode >= 0) {
1294                 if (!info_caps)
1295                         pr_warn_client(cl, "mds issued no caps on %llx.%llx\n",
1296                                        ceph_vinop(inode));
1297                 __ceph_touch_fmode(ci, mdsc, cap_fmode);
1298         }
1299
1300         spin_unlock(&ci->i_ceph_lock);
1301
1302         ceph_fscache_register_inode_cookie(inode);
1303
1304         if (fill_inline)
1305                 ceph_fill_inline_data(inode, locked_page,
1306                                       iinfo->inline_data, iinfo->inline_len);
1307
1308         if (wake)
1309                 wake_up_all(&ci->i_cap_wq);
1310
1311         /* queue truncate if we saw i_size decrease */
1312         if (queue_trunc)
1313                 ceph_queue_vmtruncate(inode);
1314
1315         /* populate frag tree */
1316         if (S_ISDIR(inode->i_mode))
1317                 ceph_fill_fragtree(inode, &info->fragtree, dirinfo);
1318
1319         /* update delegation info? */
1320         if (dirinfo)
1321                 ceph_fill_dirfrag(inode, dirinfo);
1322
1323         err = 0;
1324 out:
1325         if (new_cap)
1326                 ceph_put_cap(mdsc, new_cap);
1327         ceph_buffer_put(old_blob);
1328         ceph_buffer_put(xattr_blob);
1329         ceph_put_string(pool_ns);
1330         return err;
1331 }
1332
1333 /*
1334  * caller should hold session s_mutex and dentry->d_lock.
1335  */
1336 static void __update_dentry_lease(struct inode *dir, struct dentry *dentry,
1337                                   struct ceph_mds_reply_lease *lease,
1338                                   struct ceph_mds_session *session,
1339                                   unsigned long from_time,
1340                                   struct ceph_mds_session **old_lease_session)
1341 {
1342         struct ceph_client *cl = ceph_inode_to_client(dir);
1343         struct ceph_dentry_info *di = ceph_dentry(dentry);
1344         unsigned mask = le16_to_cpu(lease->mask);
1345         long unsigned duration = le32_to_cpu(lease->duration_ms);
1346         long unsigned ttl = from_time + (duration * HZ) / 1000;
1347         long unsigned half_ttl = from_time + (duration * HZ / 2) / 1000;
1348
1349         doutc(cl, "%p duration %lu ms ttl %lu\n", dentry, duration, ttl);
1350
1351         /* only track leases on regular dentries */
1352         if (ceph_snap(dir) != CEPH_NOSNAP)
1353                 return;
1354
1355         if (mask & CEPH_LEASE_PRIMARY_LINK)
1356                 di->flags |= CEPH_DENTRY_PRIMARY_LINK;
1357         else
1358                 di->flags &= ~CEPH_DENTRY_PRIMARY_LINK;
1359
1360         di->lease_shared_gen = atomic_read(&ceph_inode(dir)->i_shared_gen);
1361         if (!(mask & CEPH_LEASE_VALID)) {
1362                 __ceph_dentry_dir_lease_touch(di);
1363                 return;
1364         }
1365
1366         if (di->lease_gen == atomic_read(&session->s_cap_gen) &&
1367             time_before(ttl, di->time))
1368                 return;  /* we already have a newer lease. */
1369
1370         if (di->lease_session && di->lease_session != session) {
1371                 *old_lease_session = di->lease_session;
1372                 di->lease_session = NULL;
1373         }
1374
1375         if (!di->lease_session)
1376                 di->lease_session = ceph_get_mds_session(session);
1377         di->lease_gen = atomic_read(&session->s_cap_gen);
1378         di->lease_seq = le32_to_cpu(lease->seq);
1379         di->lease_renew_after = half_ttl;
1380         di->lease_renew_from = 0;
1381         di->time = ttl;
1382
1383         __ceph_dentry_lease_touch(di);
1384 }
1385
1386 static inline void update_dentry_lease(struct inode *dir, struct dentry *dentry,
1387                                         struct ceph_mds_reply_lease *lease,
1388                                         struct ceph_mds_session *session,
1389                                         unsigned long from_time)
1390 {
1391         struct ceph_mds_session *old_lease_session = NULL;
1392         spin_lock(&dentry->d_lock);
1393         __update_dentry_lease(dir, dentry, lease, session, from_time,
1394                               &old_lease_session);
1395         spin_unlock(&dentry->d_lock);
1396         ceph_put_mds_session(old_lease_session);
1397 }
1398
1399 /*
1400  * update dentry lease without having parent inode locked
1401  */
1402 static void update_dentry_lease_careful(struct dentry *dentry,
1403                                         struct ceph_mds_reply_lease *lease,
1404                                         struct ceph_mds_session *session,
1405                                         unsigned long from_time,
1406                                         char *dname, u32 dname_len,
1407                                         struct ceph_vino *pdvino,
1408                                         struct ceph_vino *ptvino)
1409
1410 {
1411         struct inode *dir;
1412         struct ceph_mds_session *old_lease_session = NULL;
1413
1414         spin_lock(&dentry->d_lock);
1415         /* make sure dentry's name matches target */
1416         if (dentry->d_name.len != dname_len ||
1417             memcmp(dentry->d_name.name, dname, dname_len))
1418                 goto out_unlock;
1419
1420         dir = d_inode(dentry->d_parent);
1421         /* make sure parent matches dvino */
1422         if (!ceph_ino_compare(dir, pdvino))
1423                 goto out_unlock;
1424
1425         /* make sure dentry's inode matches target. NULL ptvino means that
1426          * we expect a negative dentry */
1427         if (ptvino) {
1428                 if (d_really_is_negative(dentry))
1429                         goto out_unlock;
1430                 if (!ceph_ino_compare(d_inode(dentry), ptvino))
1431                         goto out_unlock;
1432         } else {
1433                 if (d_really_is_positive(dentry))
1434                         goto out_unlock;
1435         }
1436
1437         __update_dentry_lease(dir, dentry, lease, session,
1438                               from_time, &old_lease_session);
1439 out_unlock:
1440         spin_unlock(&dentry->d_lock);
1441         ceph_put_mds_session(old_lease_session);
1442 }
1443
1444 /*
1445  * splice a dentry to an inode.
1446  * caller must hold directory i_rwsem for this to be safe.
1447  */
1448 static int splice_dentry(struct dentry **pdn, struct inode *in)
1449 {
1450         struct ceph_client *cl = ceph_inode_to_client(in);
1451         struct dentry *dn = *pdn;
1452         struct dentry *realdn;
1453
1454         BUG_ON(d_inode(dn));
1455
1456         if (S_ISDIR(in->i_mode)) {
1457                 /* If inode is directory, d_splice_alias() below will remove
1458                  * 'realdn' from its origin parent. We need to ensure that
1459                  * origin parent's readdir cache will not reference 'realdn'
1460                  */
1461                 realdn = d_find_any_alias(in);
1462                 if (realdn) {
1463                         struct ceph_dentry_info *di = ceph_dentry(realdn);
1464                         spin_lock(&realdn->d_lock);
1465
1466                         realdn->d_op->d_prune(realdn);
1467
1468                         di->time = jiffies;
1469                         di->lease_shared_gen = 0;
1470                         di->offset = 0;
1471
1472                         spin_unlock(&realdn->d_lock);
1473                         dput(realdn);
1474                 }
1475         }
1476
1477         /* dn must be unhashed */
1478         if (!d_unhashed(dn))
1479                 d_drop(dn);
1480         realdn = d_splice_alias(in, dn);
1481         if (IS_ERR(realdn)) {
1482                 pr_err_client(cl, "error %ld %p inode %p ino %llx.%llx\n",
1483                               PTR_ERR(realdn), dn, in, ceph_vinop(in));
1484                 return PTR_ERR(realdn);
1485         }
1486
1487         if (realdn) {
1488                 doutc(cl, "dn %p (%d) spliced with %p (%d) inode %p ino %llx.%llx\n",
1489                       dn, d_count(dn), realdn, d_count(realdn),
1490                       d_inode(realdn), ceph_vinop(d_inode(realdn)));
1491                 dput(dn);
1492                 *pdn = realdn;
1493         } else {
1494                 BUG_ON(!ceph_dentry(dn));
1495                 doutc(cl, "dn %p attached to %p ino %llx.%llx\n", dn,
1496                       d_inode(dn), ceph_vinop(d_inode(dn)));
1497         }
1498         return 0;
1499 }
1500
1501 /*
1502  * Incorporate results into the local cache.  This is either just
1503  * one inode, or a directory, dentry, and possibly linked-to inode (e.g.,
1504  * after a lookup).
1505  *
1506  * A reply may contain
1507  *         a directory inode along with a dentry.
1508  *  and/or a target inode
1509  *
1510  * Called with snap_rwsem (read).
1511  */
1512 int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req)
1513 {
1514         struct ceph_mds_session *session = req->r_session;
1515         struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1516         struct inode *in = NULL;
1517         struct ceph_vino tvino, dvino;
1518         struct ceph_fs_client *fsc = ceph_sb_to_fs_client(sb);
1519         struct ceph_client *cl = fsc->client;
1520         int err = 0;
1521
1522         doutc(cl, "%p is_dentry %d is_target %d\n", req,
1523               rinfo->head->is_dentry, rinfo->head->is_target);
1524
1525         if (!rinfo->head->is_target && !rinfo->head->is_dentry) {
1526                 doutc(cl, "reply is empty!\n");
1527                 if (rinfo->head->result == 0 && req->r_parent)
1528                         ceph_invalidate_dir_request(req);
1529                 return 0;
1530         }
1531
1532         if (rinfo->head->is_dentry) {
1533                 struct inode *dir = req->r_parent;
1534
1535                 if (dir) {
1536                         err = ceph_fill_inode(dir, NULL, &rinfo->diri,
1537                                               rinfo->dirfrag, session, -1,
1538                                               &req->r_caps_reservation);
1539                         if (err < 0)
1540                                 goto done;
1541                 } else {
1542                         WARN_ON_ONCE(1);
1543                 }
1544
1545                 if (dir && req->r_op == CEPH_MDS_OP_LOOKUPNAME &&
1546                     test_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags) &&
1547                     !test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
1548                         bool is_nokey = false;
1549                         struct qstr dname;
1550                         struct dentry *dn, *parent;
1551                         struct fscrypt_str oname = FSTR_INIT(NULL, 0);
1552                         struct ceph_fname fname = { .dir        = dir,
1553                                                     .name       = rinfo->dname,
1554                                                     .ctext      = rinfo->altname,
1555                                                     .name_len   = rinfo->dname_len,
1556                                                     .ctext_len  = rinfo->altname_len };
1557
1558                         BUG_ON(!rinfo->head->is_target);
1559                         BUG_ON(req->r_dentry);
1560
1561                         parent = d_find_any_alias(dir);
1562                         BUG_ON(!parent);
1563
1564                         err = ceph_fname_alloc_buffer(dir, &oname);
1565                         if (err < 0) {
1566                                 dput(parent);
1567                                 goto done;
1568                         }
1569
1570                         err = ceph_fname_to_usr(&fname, NULL, &oname, &is_nokey);
1571                         if (err < 0) {
1572                                 dput(parent);
1573                                 ceph_fname_free_buffer(dir, &oname);
1574                                 goto done;
1575                         }
1576                         dname.name = oname.name;
1577                         dname.len = oname.len;
1578                         dname.hash = full_name_hash(parent, dname.name, dname.len);
1579                         tvino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1580                         tvino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1581 retry_lookup:
1582                         dn = d_lookup(parent, &dname);
1583                         doutc(cl, "d_lookup on parent=%p name=%.*s got %p\n",
1584                               parent, dname.len, dname.name, dn);
1585
1586                         if (!dn) {
1587                                 dn = d_alloc(parent, &dname);
1588                                 doutc(cl, "d_alloc %p '%.*s' = %p\n", parent,
1589                                       dname.len, dname.name, dn);
1590                                 if (!dn) {
1591                                         dput(parent);
1592                                         ceph_fname_free_buffer(dir, &oname);
1593                                         err = -ENOMEM;
1594                                         goto done;
1595                                 }
1596                                 if (is_nokey) {
1597                                         spin_lock(&dn->d_lock);
1598                                         dn->d_flags |= DCACHE_NOKEY_NAME;
1599                                         spin_unlock(&dn->d_lock);
1600                                 }
1601                                 err = 0;
1602                         } else if (d_really_is_positive(dn) &&
1603                                    (ceph_ino(d_inode(dn)) != tvino.ino ||
1604                                     ceph_snap(d_inode(dn)) != tvino.snap)) {
1605                                 doutc(cl, " dn %p points to wrong inode %p\n",
1606                                       dn, d_inode(dn));
1607                                 ceph_dir_clear_ordered(dir);
1608                                 d_delete(dn);
1609                                 dput(dn);
1610                                 goto retry_lookup;
1611                         }
1612                         ceph_fname_free_buffer(dir, &oname);
1613
1614                         req->r_dentry = dn;
1615                         dput(parent);
1616                 }
1617         }
1618
1619         if (rinfo->head->is_target) {
1620                 /* Should be filled in by handle_reply */
1621                 BUG_ON(!req->r_target_inode);
1622
1623                 in = req->r_target_inode;
1624                 err = ceph_fill_inode(in, req->r_locked_page, &rinfo->targeti,
1625                                 NULL, session,
1626                                 (!test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags) &&
1627                                  !test_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags) &&
1628                                  rinfo->head->result == 0) ?  req->r_fmode : -1,
1629                                 &req->r_caps_reservation);
1630                 if (err < 0) {
1631                         pr_err_client(cl, "badness %p %llx.%llx\n", in,
1632                                       ceph_vinop(in));
1633                         req->r_target_inode = NULL;
1634                         if (in->i_state & I_NEW)
1635                                 discard_new_inode(in);
1636                         else
1637                                 iput(in);
1638                         goto done;
1639                 }
1640                 if (in->i_state & I_NEW)
1641                         unlock_new_inode(in);
1642         }
1643
1644         /*
1645          * ignore null lease/binding on snapdir ENOENT, or else we
1646          * will have trouble splicing in the virtual snapdir later
1647          */
1648         if (rinfo->head->is_dentry &&
1649             !test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags) &&
1650             test_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags) &&
1651             (rinfo->head->is_target || strncmp(req->r_dentry->d_name.name,
1652                                                fsc->mount_options->snapdir_name,
1653                                                req->r_dentry->d_name.len))) {
1654                 /*
1655                  * lookup link rename   : null -> possibly existing inode
1656                  * mknod symlink mkdir  : null -> new inode
1657                  * unlink               : linked -> null
1658                  */
1659                 struct inode *dir = req->r_parent;
1660                 struct dentry *dn = req->r_dentry;
1661                 bool have_dir_cap, have_lease;
1662
1663                 BUG_ON(!dn);
1664                 BUG_ON(!dir);
1665                 BUG_ON(d_inode(dn->d_parent) != dir);
1666
1667                 dvino.ino = le64_to_cpu(rinfo->diri.in->ino);
1668                 dvino.snap = le64_to_cpu(rinfo->diri.in->snapid);
1669
1670                 BUG_ON(ceph_ino(dir) != dvino.ino);
1671                 BUG_ON(ceph_snap(dir) != dvino.snap);
1672
1673                 /* do we have a lease on the whole dir? */
1674                 have_dir_cap =
1675                         (le32_to_cpu(rinfo->diri.in->cap.caps) &
1676                          CEPH_CAP_FILE_SHARED);
1677
1678                 /* do we have a dn lease? */
1679                 have_lease = have_dir_cap ||
1680                         le32_to_cpu(rinfo->dlease->duration_ms);
1681                 if (!have_lease)
1682                         doutc(cl, "no dentry lease or dir cap\n");
1683
1684                 /* rename? */
1685                 if (req->r_old_dentry && req->r_op == CEPH_MDS_OP_RENAME) {
1686                         struct inode *olddir = req->r_old_dentry_dir;
1687                         BUG_ON(!olddir);
1688
1689                         doutc(cl, " src %p '%pd' dst %p '%pd'\n",
1690                               req->r_old_dentry, req->r_old_dentry, dn, dn);
1691                         doutc(cl, "doing d_move %p -> %p\n", req->r_old_dentry, dn);
1692
1693                         /* d_move screws up sibling dentries' offsets */
1694                         ceph_dir_clear_ordered(dir);
1695                         ceph_dir_clear_ordered(olddir);
1696
1697                         d_move(req->r_old_dentry, dn);
1698                         doutc(cl, " src %p '%pd' dst %p '%pd'\n",
1699                               req->r_old_dentry, req->r_old_dentry, dn, dn);
1700
1701                         /* ensure target dentry is invalidated, despite
1702                            rehashing bug in vfs_rename_dir */
1703                         ceph_invalidate_dentry_lease(dn);
1704
1705                         doutc(cl, "dn %p gets new offset %lld\n",
1706                               req->r_old_dentry,
1707                               ceph_dentry(req->r_old_dentry)->offset);
1708
1709                         /* swap r_dentry and r_old_dentry in case that
1710                          * splice_dentry() gets called later. This is safe
1711                          * because no other place will use them */
1712                         req->r_dentry = req->r_old_dentry;
1713                         req->r_old_dentry = dn;
1714                         dn = req->r_dentry;
1715                 }
1716
1717                 /* null dentry? */
1718                 if (!rinfo->head->is_target) {
1719                         doutc(cl, "null dentry\n");
1720                         if (d_really_is_positive(dn)) {
1721                                 doutc(cl, "d_delete %p\n", dn);
1722                                 ceph_dir_clear_ordered(dir);
1723                                 d_delete(dn);
1724                         } else if (have_lease) {
1725                                 if (d_unhashed(dn))
1726                                         d_add(dn, NULL);
1727                         }
1728
1729                         if (!d_unhashed(dn) && have_lease)
1730                                 update_dentry_lease(dir, dn,
1731                                                     rinfo->dlease, session,
1732                                                     req->r_request_started);
1733                         goto done;
1734                 }
1735
1736                 /* attach proper inode */
1737                 if (d_really_is_negative(dn)) {
1738                         ceph_dir_clear_ordered(dir);
1739                         ihold(in);
1740                         err = splice_dentry(&req->r_dentry, in);
1741                         if (err < 0)
1742                                 goto done;
1743                         dn = req->r_dentry;  /* may have spliced */
1744                 } else if (d_really_is_positive(dn) && d_inode(dn) != in) {
1745                         doutc(cl, " %p links to %p %llx.%llx, not %llx.%llx\n",
1746                               dn, d_inode(dn), ceph_vinop(d_inode(dn)),
1747                               ceph_vinop(in));
1748                         d_invalidate(dn);
1749                         have_lease = false;
1750                 }
1751
1752                 if (have_lease) {
1753                         update_dentry_lease(dir, dn,
1754                                             rinfo->dlease, session,
1755                                             req->r_request_started);
1756                 }
1757                 doutc(cl, " final dn %p\n", dn);
1758         } else if ((req->r_op == CEPH_MDS_OP_LOOKUPSNAP ||
1759                     req->r_op == CEPH_MDS_OP_MKSNAP) &&
1760                    test_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags) &&
1761                    !test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
1762                 struct inode *dir = req->r_parent;
1763
1764                 /* fill out a snapdir LOOKUPSNAP dentry */
1765                 BUG_ON(!dir);
1766                 BUG_ON(ceph_snap(dir) != CEPH_SNAPDIR);
1767                 BUG_ON(!req->r_dentry);
1768                 doutc(cl, " linking snapped dir %p to dn %p\n", in,
1769                       req->r_dentry);
1770                 ceph_dir_clear_ordered(dir);
1771                 ihold(in);
1772                 err = splice_dentry(&req->r_dentry, in);
1773                 if (err < 0)
1774                         goto done;
1775         } else if (rinfo->head->is_dentry && req->r_dentry) {
1776                 /* parent inode is not locked, be carefull */
1777                 struct ceph_vino *ptvino = NULL;
1778                 dvino.ino = le64_to_cpu(rinfo->diri.in->ino);
1779                 dvino.snap = le64_to_cpu(rinfo->diri.in->snapid);
1780                 if (rinfo->head->is_target) {
1781                         tvino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1782                         tvino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1783                         ptvino = &tvino;
1784                 }
1785                 update_dentry_lease_careful(req->r_dentry, rinfo->dlease,
1786                                             session, req->r_request_started,
1787                                             rinfo->dname, rinfo->dname_len,
1788                                             &dvino, ptvino);
1789         }
1790 done:
1791         doutc(cl, "done err=%d\n", err);
1792         return err;
1793 }
1794
1795 /*
1796  * Prepopulate our cache with readdir results, leases, etc.
1797  */
1798 static int readdir_prepopulate_inodes_only(struct ceph_mds_request *req,
1799                                            struct ceph_mds_session *session)
1800 {
1801         struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1802         struct ceph_client *cl = session->s_mdsc->fsc->client;
1803         int i, err = 0;
1804
1805         for (i = 0; i < rinfo->dir_nr; i++) {
1806                 struct ceph_mds_reply_dir_entry *rde = rinfo->dir_entries + i;
1807                 struct ceph_vino vino;
1808                 struct inode *in;
1809                 int rc;
1810
1811                 vino.ino = le64_to_cpu(rde->inode.in->ino);
1812                 vino.snap = le64_to_cpu(rde->inode.in->snapid);
1813
1814                 in = ceph_get_inode(req->r_dentry->d_sb, vino, NULL);
1815                 if (IS_ERR(in)) {
1816                         err = PTR_ERR(in);
1817                         doutc(cl, "badness got %d\n", err);
1818                         continue;
1819                 }
1820                 rc = ceph_fill_inode(in, NULL, &rde->inode, NULL, session,
1821                                      -1, &req->r_caps_reservation);
1822                 if (rc < 0) {
1823                         pr_err_client(cl, "inode badness on %p got %d\n", in,
1824                                       rc);
1825                         err = rc;
1826                         if (in->i_state & I_NEW) {
1827                                 ihold(in);
1828                                 discard_new_inode(in);
1829                         }
1830                 } else if (in->i_state & I_NEW) {
1831                         unlock_new_inode(in);
1832                 }
1833
1834                 iput(in);
1835         }
1836
1837         return err;
1838 }
1839
1840 void ceph_readdir_cache_release(struct ceph_readdir_cache_control *ctl)
1841 {
1842         if (ctl->page) {
1843                 kunmap(ctl->page);
1844                 put_page(ctl->page);
1845                 ctl->page = NULL;
1846         }
1847 }
1848
1849 static int fill_readdir_cache(struct inode *dir, struct dentry *dn,
1850                               struct ceph_readdir_cache_control *ctl,
1851                               struct ceph_mds_request *req)
1852 {
1853         struct ceph_client *cl = ceph_inode_to_client(dir);
1854         struct ceph_inode_info *ci = ceph_inode(dir);
1855         unsigned nsize = PAGE_SIZE / sizeof(struct dentry*);
1856         unsigned idx = ctl->index % nsize;
1857         pgoff_t pgoff = ctl->index / nsize;
1858
1859         if (!ctl->page || pgoff != page_index(ctl->page)) {
1860                 ceph_readdir_cache_release(ctl);
1861                 if (idx == 0)
1862                         ctl->page = grab_cache_page(&dir->i_data, pgoff);
1863                 else
1864                         ctl->page = find_lock_page(&dir->i_data, pgoff);
1865                 if (!ctl->page) {
1866                         ctl->index = -1;
1867                         return idx == 0 ? -ENOMEM : 0;
1868                 }
1869                 /* reading/filling the cache are serialized by
1870                  * i_rwsem, no need to use page lock */
1871                 unlock_page(ctl->page);
1872                 ctl->dentries = kmap(ctl->page);
1873                 if (idx == 0)
1874                         memset(ctl->dentries, 0, PAGE_SIZE);
1875         }
1876
1877         if (req->r_dir_release_cnt == atomic64_read(&ci->i_release_count) &&
1878             req->r_dir_ordered_cnt == atomic64_read(&ci->i_ordered_count)) {
1879                 doutc(cl, "dn %p idx %d\n", dn, ctl->index);
1880                 ctl->dentries[idx] = dn;
1881                 ctl->index++;
1882         } else {
1883                 doutc(cl, "disable readdir cache\n");
1884                 ctl->index = -1;
1885         }
1886         return 0;
1887 }
1888
1889 int ceph_readdir_prepopulate(struct ceph_mds_request *req,
1890                              struct ceph_mds_session *session)
1891 {
1892         struct dentry *parent = req->r_dentry;
1893         struct inode *inode = d_inode(parent);
1894         struct ceph_inode_info *ci = ceph_inode(inode);
1895         struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1896         struct ceph_client *cl = session->s_mdsc->fsc->client;
1897         struct qstr dname;
1898         struct dentry *dn;
1899         struct inode *in;
1900         int err = 0, skipped = 0, ret, i;
1901         u32 frag = le32_to_cpu(req->r_args.readdir.frag);
1902         u32 last_hash = 0;
1903         u32 fpos_offset;
1904         struct ceph_readdir_cache_control cache_ctl = {};
1905
1906         if (test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags))
1907                 return readdir_prepopulate_inodes_only(req, session);
1908
1909         if (rinfo->hash_order) {
1910                 if (req->r_path2) {
1911                         last_hash = ceph_str_hash(ci->i_dir_layout.dl_dir_hash,
1912                                                   req->r_path2,
1913                                                   strlen(req->r_path2));
1914                         last_hash = ceph_frag_value(last_hash);
1915                 } else if (rinfo->offset_hash) {
1916                         /* mds understands offset_hash */
1917                         WARN_ON_ONCE(req->r_readdir_offset != 2);
1918                         last_hash = le32_to_cpu(req->r_args.readdir.offset_hash);
1919                 }
1920         }
1921
1922         if (rinfo->dir_dir &&
1923             le32_to_cpu(rinfo->dir_dir->frag) != frag) {
1924                 doutc(cl, "got new frag %x -> %x\n", frag,
1925                             le32_to_cpu(rinfo->dir_dir->frag));
1926                 frag = le32_to_cpu(rinfo->dir_dir->frag);
1927                 if (!rinfo->hash_order)
1928                         req->r_readdir_offset = 2;
1929         }
1930
1931         if (le32_to_cpu(rinfo->head->op) == CEPH_MDS_OP_LSSNAP) {
1932                 doutc(cl, "%d items under SNAPDIR dn %p\n",
1933                       rinfo->dir_nr, parent);
1934         } else {
1935                 doutc(cl, "%d items under dn %p\n", rinfo->dir_nr, parent);
1936                 if (rinfo->dir_dir)
1937                         ceph_fill_dirfrag(d_inode(parent), rinfo->dir_dir);
1938
1939                 if (ceph_frag_is_leftmost(frag) &&
1940                     req->r_readdir_offset == 2 &&
1941                     !(rinfo->hash_order && last_hash)) {
1942                         /* note dir version at start of readdir so we can
1943                          * tell if any dentries get dropped */
1944                         req->r_dir_release_cnt =
1945                                 atomic64_read(&ci->i_release_count);
1946                         req->r_dir_ordered_cnt =
1947                                 atomic64_read(&ci->i_ordered_count);
1948                         req->r_readdir_cache_idx = 0;
1949                 }
1950         }
1951
1952         cache_ctl.index = req->r_readdir_cache_idx;
1953         fpos_offset = req->r_readdir_offset;
1954
1955         /* FIXME: release caps/leases if error occurs */
1956         for (i = 0; i < rinfo->dir_nr; i++) {
1957                 struct ceph_mds_reply_dir_entry *rde = rinfo->dir_entries + i;
1958                 struct ceph_vino tvino;
1959
1960                 dname.name = rde->name;
1961                 dname.len = rde->name_len;
1962                 dname.hash = full_name_hash(parent, dname.name, dname.len);
1963
1964                 tvino.ino = le64_to_cpu(rde->inode.in->ino);
1965                 tvino.snap = le64_to_cpu(rde->inode.in->snapid);
1966
1967                 if (rinfo->hash_order) {
1968                         u32 hash = ceph_frag_value(rde->raw_hash);
1969                         if (hash != last_hash)
1970                                 fpos_offset = 2;
1971                         last_hash = hash;
1972                         rde->offset = ceph_make_fpos(hash, fpos_offset++, true);
1973                 } else {
1974                         rde->offset = ceph_make_fpos(frag, fpos_offset++, false);
1975                 }
1976
1977 retry_lookup:
1978                 dn = d_lookup(parent, &dname);
1979                 doutc(cl, "d_lookup on parent=%p name=%.*s got %p\n",
1980                       parent, dname.len, dname.name, dn);
1981
1982                 if (!dn) {
1983                         dn = d_alloc(parent, &dname);
1984                         doutc(cl, "d_alloc %p '%.*s' = %p\n", parent,
1985                               dname.len, dname.name, dn);
1986                         if (!dn) {
1987                                 doutc(cl, "d_alloc badness\n");
1988                                 err = -ENOMEM;
1989                                 goto out;
1990                         }
1991                         if (rde->is_nokey) {
1992                                 spin_lock(&dn->d_lock);
1993                                 dn->d_flags |= DCACHE_NOKEY_NAME;
1994                                 spin_unlock(&dn->d_lock);
1995                         }
1996                 } else if (d_really_is_positive(dn) &&
1997                            (ceph_ino(d_inode(dn)) != tvino.ino ||
1998                             ceph_snap(d_inode(dn)) != tvino.snap)) {
1999                         struct ceph_dentry_info *di = ceph_dentry(dn);
2000                         doutc(cl, " dn %p points to wrong inode %p\n",
2001                               dn, d_inode(dn));
2002
2003                         spin_lock(&dn->d_lock);
2004                         if (di->offset > 0 &&
2005                             di->lease_shared_gen ==
2006                             atomic_read(&ci->i_shared_gen)) {
2007                                 __ceph_dir_clear_ordered(ci);
2008                                 di->offset = 0;
2009                         }
2010                         spin_unlock(&dn->d_lock);
2011
2012                         d_delete(dn);
2013                         dput(dn);
2014                         goto retry_lookup;
2015                 }
2016
2017                 /* inode */
2018                 if (d_really_is_positive(dn)) {
2019                         in = d_inode(dn);
2020                 } else {
2021                         in = ceph_get_inode(parent->d_sb, tvino, NULL);
2022                         if (IS_ERR(in)) {
2023                                 doutc(cl, "new_inode badness\n");
2024                                 d_drop(dn);
2025                                 dput(dn);
2026                                 err = PTR_ERR(in);
2027                                 goto out;
2028                         }
2029                 }
2030
2031                 ret = ceph_fill_inode(in, NULL, &rde->inode, NULL, session,
2032                                       -1, &req->r_caps_reservation);
2033                 if (ret < 0) {
2034                         pr_err_client(cl, "badness on %p %llx.%llx\n", in,
2035                                       ceph_vinop(in));
2036                         if (d_really_is_negative(dn)) {
2037                                 if (in->i_state & I_NEW) {
2038                                         ihold(in);
2039                                         discard_new_inode(in);
2040                                 }
2041                                 iput(in);
2042                         }
2043                         d_drop(dn);
2044                         err = ret;
2045                         goto next_item;
2046                 }
2047                 if (in->i_state & I_NEW)
2048                         unlock_new_inode(in);
2049
2050                 if (d_really_is_negative(dn)) {
2051                         if (ceph_security_xattr_deadlock(in)) {
2052                                 doutc(cl, " skip splicing dn %p to inode %p"
2053                                       " (security xattr deadlock)\n", dn, in);
2054                                 iput(in);
2055                                 skipped++;
2056                                 goto next_item;
2057                         }
2058
2059                         err = splice_dentry(&dn, in);
2060                         if (err < 0)
2061                                 goto next_item;
2062                 }
2063
2064                 ceph_dentry(dn)->offset = rde->offset;
2065
2066                 update_dentry_lease(d_inode(parent), dn,
2067                                     rde->lease, req->r_session,
2068                                     req->r_request_started);
2069
2070                 if (err == 0 && skipped == 0 && cache_ctl.index >= 0) {
2071                         ret = fill_readdir_cache(d_inode(parent), dn,
2072                                                  &cache_ctl, req);
2073                         if (ret < 0)
2074                                 err = ret;
2075                 }
2076 next_item:
2077                 dput(dn);
2078         }
2079 out:
2080         if (err == 0 && skipped == 0) {
2081                 set_bit(CEPH_MDS_R_DID_PREPOPULATE, &req->r_req_flags);
2082                 req->r_readdir_cache_idx = cache_ctl.index;
2083         }
2084         ceph_readdir_cache_release(&cache_ctl);
2085         doutc(cl, "done\n");
2086         return err;
2087 }
2088
2089 bool ceph_inode_set_size(struct inode *inode, loff_t size)
2090 {
2091         struct ceph_client *cl = ceph_inode_to_client(inode);
2092         struct ceph_inode_info *ci = ceph_inode(inode);
2093         bool ret;
2094
2095         spin_lock(&ci->i_ceph_lock);
2096         doutc(cl, "set_size %p %llu -> %llu\n", inode, i_size_read(inode), size);
2097         i_size_write(inode, size);
2098         ceph_fscache_update(inode);
2099         inode->i_blocks = calc_inode_blocks(size);
2100
2101         ret = __ceph_should_report_size(ci);
2102
2103         spin_unlock(&ci->i_ceph_lock);
2104
2105         return ret;
2106 }
2107
2108 void ceph_queue_inode_work(struct inode *inode, int work_bit)
2109 {
2110         struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);
2111         struct ceph_client *cl = fsc->client;
2112         struct ceph_inode_info *ci = ceph_inode(inode);
2113         set_bit(work_bit, &ci->i_work_mask);
2114
2115         ihold(inode);
2116         if (queue_work(fsc->inode_wq, &ci->i_work)) {
2117                 doutc(cl, "%p %llx.%llx mask=%lx\n", inode,
2118                       ceph_vinop(inode), ci->i_work_mask);
2119         } else {
2120                 doutc(cl, "%p %llx.%llx already queued, mask=%lx\n",
2121                       inode, ceph_vinop(inode), ci->i_work_mask);
2122                 iput(inode);
2123         }
2124 }
2125
2126 static void ceph_do_invalidate_pages(struct inode *inode)
2127 {
2128         struct ceph_client *cl = ceph_inode_to_client(inode);
2129         struct ceph_inode_info *ci = ceph_inode(inode);
2130         u32 orig_gen;
2131         int check = 0;
2132
2133         ceph_fscache_invalidate(inode, false);
2134
2135         mutex_lock(&ci->i_truncate_mutex);
2136
2137         if (ceph_inode_is_shutdown(inode)) {
2138                 pr_warn_ratelimited_client(cl,
2139                         "%p %llx.%llx is shut down\n", inode,
2140                         ceph_vinop(inode));
2141                 mapping_set_error(inode->i_mapping, -EIO);
2142                 truncate_pagecache(inode, 0);
2143                 mutex_unlock(&ci->i_truncate_mutex);
2144                 goto out;
2145         }
2146
2147         spin_lock(&ci->i_ceph_lock);
2148         doutc(cl, "%p %llx.%llx gen %d revoking %d\n", inode,
2149               ceph_vinop(inode), ci->i_rdcache_gen, ci->i_rdcache_revoking);
2150         if (ci->i_rdcache_revoking != ci->i_rdcache_gen) {
2151                 if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE))
2152                         check = 1;
2153                 spin_unlock(&ci->i_ceph_lock);
2154                 mutex_unlock(&ci->i_truncate_mutex);
2155                 goto out;
2156         }
2157         orig_gen = ci->i_rdcache_gen;
2158         spin_unlock(&ci->i_ceph_lock);
2159
2160         if (invalidate_inode_pages2(inode->i_mapping) < 0) {
2161                 pr_err_client(cl, "invalidate_inode_pages2 %llx.%llx failed\n",
2162                               ceph_vinop(inode));
2163         }
2164
2165         spin_lock(&ci->i_ceph_lock);
2166         if (orig_gen == ci->i_rdcache_gen &&
2167             orig_gen == ci->i_rdcache_revoking) {
2168                 doutc(cl, "%p %llx.%llx gen %d successful\n", inode,
2169                       ceph_vinop(inode), ci->i_rdcache_gen);
2170                 ci->i_rdcache_revoking--;
2171                 check = 1;
2172         } else {
2173                 doutc(cl, "%p %llx.%llx gen %d raced, now %d revoking %d\n",
2174                       inode, ceph_vinop(inode), orig_gen, ci->i_rdcache_gen,
2175                       ci->i_rdcache_revoking);
2176                 if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE))
2177                         check = 1;
2178         }
2179         spin_unlock(&ci->i_ceph_lock);
2180         mutex_unlock(&ci->i_truncate_mutex);
2181 out:
2182         if (check)
2183                 ceph_check_caps(ci, 0);
2184 }
2185
2186 /*
2187  * Make sure any pending truncation is applied before doing anything
2188  * that may depend on it.
2189  */
2190 void __ceph_do_pending_vmtruncate(struct inode *inode)
2191 {
2192         struct ceph_client *cl = ceph_inode_to_client(inode);
2193         struct ceph_inode_info *ci = ceph_inode(inode);
2194         u64 to;
2195         int wrbuffer_refs, finish = 0;
2196
2197         mutex_lock(&ci->i_truncate_mutex);
2198 retry:
2199         spin_lock(&ci->i_ceph_lock);
2200         if (ci->i_truncate_pending == 0) {
2201                 doutc(cl, "%p %llx.%llx none pending\n", inode,
2202                       ceph_vinop(inode));
2203                 spin_unlock(&ci->i_ceph_lock);
2204                 mutex_unlock(&ci->i_truncate_mutex);
2205                 return;
2206         }
2207
2208         /*
2209          * make sure any dirty snapped pages are flushed before we
2210          * possibly truncate them.. so write AND block!
2211          */
2212         if (ci->i_wrbuffer_ref_head < ci->i_wrbuffer_ref) {
2213                 spin_unlock(&ci->i_ceph_lock);
2214                 doutc(cl, "%p %llx.%llx flushing snaps first\n", inode,
2215                       ceph_vinop(inode));
2216                 filemap_write_and_wait_range(&inode->i_data, 0,
2217                                              inode->i_sb->s_maxbytes);
2218                 goto retry;
2219         }
2220
2221         /* there should be no reader or writer */
2222         WARN_ON_ONCE(ci->i_rd_ref || ci->i_wr_ref);
2223
2224         to = ci->i_truncate_pagecache_size;
2225         wrbuffer_refs = ci->i_wrbuffer_ref;
2226         doutc(cl, "%p %llx.%llx (%d) to %lld\n", inode, ceph_vinop(inode),
2227               ci->i_truncate_pending, to);
2228         spin_unlock(&ci->i_ceph_lock);
2229
2230         ceph_fscache_resize(inode, to);
2231         truncate_pagecache(inode, to);
2232
2233         spin_lock(&ci->i_ceph_lock);
2234         if (to == ci->i_truncate_pagecache_size) {
2235                 ci->i_truncate_pending = 0;
2236                 finish = 1;
2237         }
2238         spin_unlock(&ci->i_ceph_lock);
2239         if (!finish)
2240                 goto retry;
2241
2242         mutex_unlock(&ci->i_truncate_mutex);
2243
2244         if (wrbuffer_refs == 0)
2245                 ceph_check_caps(ci, 0);
2246
2247         wake_up_all(&ci->i_cap_wq);
2248 }
2249
2250 static void ceph_inode_work(struct work_struct *work)
2251 {
2252         struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
2253                                                  i_work);
2254         struct inode *inode = &ci->netfs.inode;
2255         struct ceph_client *cl = ceph_inode_to_client(inode);
2256
2257         if (test_and_clear_bit(CEPH_I_WORK_WRITEBACK, &ci->i_work_mask)) {
2258                 doutc(cl, "writeback %p %llx.%llx\n", inode, ceph_vinop(inode));
2259                 filemap_fdatawrite(&inode->i_data);
2260         }
2261         if (test_and_clear_bit(CEPH_I_WORK_INVALIDATE_PAGES, &ci->i_work_mask))
2262                 ceph_do_invalidate_pages(inode);
2263
2264         if (test_and_clear_bit(CEPH_I_WORK_VMTRUNCATE, &ci->i_work_mask))
2265                 __ceph_do_pending_vmtruncate(inode);
2266
2267         if (test_and_clear_bit(CEPH_I_WORK_CHECK_CAPS, &ci->i_work_mask))
2268                 ceph_check_caps(ci, 0);
2269
2270         if (test_and_clear_bit(CEPH_I_WORK_FLUSH_SNAPS, &ci->i_work_mask))
2271                 ceph_flush_snaps(ci, NULL);
2272
2273         iput(inode);
2274 }
2275
2276 static const char *ceph_encrypted_get_link(struct dentry *dentry,
2277                                            struct inode *inode,
2278                                            struct delayed_call *done)
2279 {
2280         struct ceph_inode_info *ci = ceph_inode(inode);
2281
2282         if (!dentry)
2283                 return ERR_PTR(-ECHILD);
2284
2285         return fscrypt_get_symlink(inode, ci->i_symlink, i_size_read(inode),
2286                                    done);
2287 }
2288
2289 static int ceph_encrypted_symlink_getattr(struct mnt_idmap *idmap,
2290                                           const struct path *path,
2291                                           struct kstat *stat, u32 request_mask,
2292                                           unsigned int query_flags)
2293 {
2294         int ret;
2295
2296         ret = ceph_getattr(idmap, path, stat, request_mask, query_flags);
2297         if (ret)
2298                 return ret;
2299         return fscrypt_symlink_getattr(path, stat);
2300 }
2301
2302 /*
2303  * symlinks
2304  */
2305 static const struct inode_operations ceph_symlink_iops = {
2306         .get_link = simple_get_link,
2307         .setattr = ceph_setattr,
2308         .getattr = ceph_getattr,
2309         .listxattr = ceph_listxattr,
2310 };
2311
2312 static const struct inode_operations ceph_encrypted_symlink_iops = {
2313         .get_link = ceph_encrypted_get_link,
2314         .setattr = ceph_setattr,
2315         .getattr = ceph_encrypted_symlink_getattr,
2316         .listxattr = ceph_listxattr,
2317 };
2318
2319 /*
2320  * Transfer the encrypted last block to the MDS and the MDS
2321  * will help update it when truncating a smaller size.
2322  *
2323  * We don't support a PAGE_SIZE that is smaller than the
2324  * CEPH_FSCRYPT_BLOCK_SIZE.
2325  */
2326 static int fill_fscrypt_truncate(struct inode *inode,
2327                                  struct ceph_mds_request *req,
2328                                  struct iattr *attr)
2329 {
2330         struct ceph_client *cl = ceph_inode_to_client(inode);
2331         struct ceph_inode_info *ci = ceph_inode(inode);
2332         int boff = attr->ia_size % CEPH_FSCRYPT_BLOCK_SIZE;
2333         loff_t pos, orig_pos = round_down(attr->ia_size,
2334                                           CEPH_FSCRYPT_BLOCK_SIZE);
2335         u64 block = orig_pos >> CEPH_FSCRYPT_BLOCK_SHIFT;
2336         struct ceph_pagelist *pagelist = NULL;
2337         struct kvec iov = {0};
2338         struct iov_iter iter;
2339         struct page *page = NULL;
2340         struct ceph_fscrypt_truncate_size_header header;
2341         int retry_op = 0;
2342         int len = CEPH_FSCRYPT_BLOCK_SIZE;
2343         loff_t i_size = i_size_read(inode);
2344         int got, ret, issued;
2345         u64 objver;
2346
2347         ret = __ceph_get_caps(inode, NULL, CEPH_CAP_FILE_RD, 0, -1, &got);
2348         if (ret < 0)
2349                 return ret;
2350
2351         issued = __ceph_caps_issued(ci, NULL);
2352
2353         doutc(cl, "size %lld -> %lld got cap refs on %s, issued %s\n",
2354               i_size, attr->ia_size, ceph_cap_string(got),
2355               ceph_cap_string(issued));
2356
2357         /* Try to writeback the dirty pagecaches */
2358         if (issued & (CEPH_CAP_FILE_BUFFER)) {
2359                 loff_t lend = orig_pos + CEPH_FSCRYPT_BLOCK_SHIFT - 1;
2360
2361                 ret = filemap_write_and_wait_range(inode->i_mapping,
2362                                                    orig_pos, lend);
2363                 if (ret < 0)
2364                         goto out;
2365         }
2366
2367         page = __page_cache_alloc(GFP_KERNEL);
2368         if (page == NULL) {
2369                 ret = -ENOMEM;
2370                 goto out;
2371         }
2372
2373         pagelist = ceph_pagelist_alloc(GFP_KERNEL);
2374         if (!pagelist) {
2375                 ret = -ENOMEM;
2376                 goto out;
2377         }
2378
2379         iov.iov_base = kmap_local_page(page);
2380         iov.iov_len = len;
2381         iov_iter_kvec(&iter, READ, &iov, 1, len);
2382
2383         pos = orig_pos;
2384         ret = __ceph_sync_read(inode, &pos, &iter, &retry_op, &objver);
2385         if (ret < 0)
2386                 goto out;
2387
2388         /* Insert the header first */
2389         header.ver = 1;
2390         header.compat = 1;
2391         header.change_attr = cpu_to_le64(inode_peek_iversion_raw(inode));
2392
2393         /*
2394          * Always set the block_size to CEPH_FSCRYPT_BLOCK_SIZE,
2395          * because in MDS it may need this to do the truncate.
2396          */
2397         header.block_size = cpu_to_le32(CEPH_FSCRYPT_BLOCK_SIZE);
2398
2399         /*
2400          * If we hit a hole here, we should just skip filling
2401          * the fscrypt for the request, because once the fscrypt
2402          * is enabled, the file will be split into many blocks
2403          * with the size of CEPH_FSCRYPT_BLOCK_SIZE, if there
2404          * has a hole, the hole size should be multiple of block
2405          * size.
2406          *
2407          * If the Rados object doesn't exist, it will be set to 0.
2408          */
2409         if (!objver) {
2410                 doutc(cl, "hit hole, ppos %lld < size %lld\n", pos, i_size);
2411
2412                 header.data_len = cpu_to_le32(8 + 8 + 4);
2413                 header.file_offset = 0;
2414                 ret = 0;
2415         } else {
2416                 header.data_len = cpu_to_le32(8 + 8 + 4 + CEPH_FSCRYPT_BLOCK_SIZE);
2417                 header.file_offset = cpu_to_le64(orig_pos);
2418
2419                 doutc(cl, "encrypt block boff/bsize %d/%lu\n", boff,
2420                       CEPH_FSCRYPT_BLOCK_SIZE);
2421
2422                 /* truncate and zero out the extra contents for the last block */
2423                 memset(iov.iov_base + boff, 0, PAGE_SIZE - boff);
2424
2425                 /* encrypt the last block */
2426                 ret = ceph_fscrypt_encrypt_block_inplace(inode, page,
2427                                                     CEPH_FSCRYPT_BLOCK_SIZE,
2428                                                     0, block,
2429                                                     GFP_KERNEL);
2430                 if (ret)
2431                         goto out;
2432         }
2433
2434         /* Insert the header */
2435         ret = ceph_pagelist_append(pagelist, &header, sizeof(header));
2436         if (ret)
2437                 goto out;
2438
2439         if (header.block_size) {
2440                 /* Append the last block contents to pagelist */
2441                 ret = ceph_pagelist_append(pagelist, iov.iov_base,
2442                                            CEPH_FSCRYPT_BLOCK_SIZE);
2443                 if (ret)
2444                         goto out;
2445         }
2446         req->r_pagelist = pagelist;
2447 out:
2448         doutc(cl, "%p %llx.%llx size dropping cap refs on %s\n", inode,
2449               ceph_vinop(inode), ceph_cap_string(got));
2450         ceph_put_cap_refs(ci, got);
2451         if (iov.iov_base)
2452                 kunmap_local(iov.iov_base);
2453         if (page)
2454                 __free_pages(page, 0);
2455         if (ret && pagelist)
2456                 ceph_pagelist_release(pagelist);
2457         return ret;
2458 }
2459
2460 int __ceph_setattr(struct inode *inode, struct iattr *attr,
2461                    struct ceph_iattr *cia)
2462 {
2463         struct ceph_inode_info *ci = ceph_inode(inode);
2464         unsigned int ia_valid = attr->ia_valid;
2465         struct ceph_mds_request *req;
2466         struct ceph_mds_client *mdsc = ceph_sb_to_fs_client(inode->i_sb)->mdsc;
2467         struct ceph_client *cl = ceph_inode_to_client(inode);
2468         struct ceph_cap_flush *prealloc_cf;
2469         loff_t isize = i_size_read(inode);
2470         int issued;
2471         int release = 0, dirtied = 0;
2472         int mask = 0;
2473         int err = 0;
2474         int inode_dirty_flags = 0;
2475         bool lock_snap_rwsem = false;
2476         bool fill_fscrypt;
2477         int truncate_retry = 20; /* The RMW will take around 50ms */
2478
2479 retry:
2480         prealloc_cf = ceph_alloc_cap_flush();
2481         if (!prealloc_cf)
2482                 return -ENOMEM;
2483
2484         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETATTR,
2485                                        USE_AUTH_MDS);
2486         if (IS_ERR(req)) {
2487                 ceph_free_cap_flush(prealloc_cf);
2488                 return PTR_ERR(req);
2489         }
2490
2491         fill_fscrypt = false;
2492         spin_lock(&ci->i_ceph_lock);
2493         issued = __ceph_caps_issued(ci, NULL);
2494
2495         if (!ci->i_head_snapc &&
2496             (issued & (CEPH_CAP_ANY_EXCL | CEPH_CAP_FILE_WR))) {
2497                 lock_snap_rwsem = true;
2498                 if (!down_read_trylock(&mdsc->snap_rwsem)) {
2499                         spin_unlock(&ci->i_ceph_lock);
2500                         down_read(&mdsc->snap_rwsem);
2501                         spin_lock(&ci->i_ceph_lock);
2502                         issued = __ceph_caps_issued(ci, NULL);
2503                 }
2504         }
2505
2506         doutc(cl, "%p %llx.%llx issued %s\n", inode, ceph_vinop(inode),
2507               ceph_cap_string(issued));
2508 #if IS_ENABLED(CONFIG_FS_ENCRYPTION)
2509         if (cia && cia->fscrypt_auth) {
2510                 u32 len = ceph_fscrypt_auth_len(cia->fscrypt_auth);
2511
2512                 if (len > sizeof(*cia->fscrypt_auth)) {
2513                         err = -EINVAL;
2514                         spin_unlock(&ci->i_ceph_lock);
2515                         goto out;
2516                 }
2517
2518                 doutc(cl, "%p %llx.%llx fscrypt_auth len %u to %u)\n", inode,
2519                       ceph_vinop(inode), ci->fscrypt_auth_len, len);
2520
2521                 /* It should never be re-set once set */
2522                 WARN_ON_ONCE(ci->fscrypt_auth);
2523
2524                 if (issued & CEPH_CAP_AUTH_EXCL) {
2525                         dirtied |= CEPH_CAP_AUTH_EXCL;
2526                         kfree(ci->fscrypt_auth);
2527                         ci->fscrypt_auth = (u8 *)cia->fscrypt_auth;
2528                         ci->fscrypt_auth_len = len;
2529                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
2530                            ci->fscrypt_auth_len != len ||
2531                            memcmp(ci->fscrypt_auth, cia->fscrypt_auth, len)) {
2532                         req->r_fscrypt_auth = cia->fscrypt_auth;
2533                         mask |= CEPH_SETATTR_FSCRYPT_AUTH;
2534                         release |= CEPH_CAP_AUTH_SHARED;
2535                 }
2536                 cia->fscrypt_auth = NULL;
2537         }
2538 #else
2539         if (cia && cia->fscrypt_auth) {
2540                 err = -EINVAL;
2541                 spin_unlock(&ci->i_ceph_lock);
2542                 goto out;
2543         }
2544 #endif /* CONFIG_FS_ENCRYPTION */
2545
2546         if (ia_valid & ATTR_UID) {
2547                 doutc(cl, "%p %llx.%llx uid %d -> %d\n", inode,
2548                       ceph_vinop(inode),
2549                       from_kuid(&init_user_ns, inode->i_uid),
2550                       from_kuid(&init_user_ns, attr->ia_uid));
2551                 if (issued & CEPH_CAP_AUTH_EXCL) {
2552                         inode->i_uid = attr->ia_uid;
2553                         dirtied |= CEPH_CAP_AUTH_EXCL;
2554                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
2555                            !uid_eq(attr->ia_uid, inode->i_uid)) {
2556                         req->r_args.setattr.uid = cpu_to_le32(
2557                                 from_kuid(&init_user_ns, attr->ia_uid));
2558                         mask |= CEPH_SETATTR_UID;
2559                         release |= CEPH_CAP_AUTH_SHARED;
2560                 }
2561         }
2562         if (ia_valid & ATTR_GID) {
2563                 doutc(cl, "%p %llx.%llx gid %d -> %d\n", inode,
2564                       ceph_vinop(inode),
2565                       from_kgid(&init_user_ns, inode->i_gid),
2566                       from_kgid(&init_user_ns, attr->ia_gid));
2567                 if (issued & CEPH_CAP_AUTH_EXCL) {
2568                         inode->i_gid = attr->ia_gid;
2569                         dirtied |= CEPH_CAP_AUTH_EXCL;
2570                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
2571                            !gid_eq(attr->ia_gid, inode->i_gid)) {
2572                         req->r_args.setattr.gid = cpu_to_le32(
2573                                 from_kgid(&init_user_ns, attr->ia_gid));
2574                         mask |= CEPH_SETATTR_GID;
2575                         release |= CEPH_CAP_AUTH_SHARED;
2576                 }
2577         }
2578         if (ia_valid & ATTR_MODE) {
2579                 doutc(cl, "%p %llx.%llx mode 0%o -> 0%o\n", inode,
2580                       ceph_vinop(inode), inode->i_mode, attr->ia_mode);
2581                 if (issued & CEPH_CAP_AUTH_EXCL) {
2582                         inode->i_mode = attr->ia_mode;
2583                         dirtied |= CEPH_CAP_AUTH_EXCL;
2584                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
2585                            attr->ia_mode != inode->i_mode) {
2586                         inode->i_mode = attr->ia_mode;
2587                         req->r_args.setattr.mode = cpu_to_le32(attr->ia_mode);
2588                         mask |= CEPH_SETATTR_MODE;
2589                         release |= CEPH_CAP_AUTH_SHARED;
2590                 }
2591         }
2592
2593         if (ia_valid & ATTR_ATIME) {
2594                 doutc(cl, "%p %llx.%llx atime %lld.%ld -> %lld.%ld\n",
2595                       inode, ceph_vinop(inode), inode->i_atime.tv_sec,
2596                       inode->i_atime.tv_nsec, attr->ia_atime.tv_sec,
2597                       attr->ia_atime.tv_nsec);
2598                 if (issued & CEPH_CAP_FILE_EXCL) {
2599                         ci->i_time_warp_seq++;
2600                         inode->i_atime = attr->ia_atime;
2601                         dirtied |= CEPH_CAP_FILE_EXCL;
2602                 } else if ((issued & CEPH_CAP_FILE_WR) &&
2603                            timespec64_compare(&inode->i_atime,
2604                                             &attr->ia_atime) < 0) {
2605                         inode->i_atime = attr->ia_atime;
2606                         dirtied |= CEPH_CAP_FILE_WR;
2607                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
2608                            !timespec64_equal(&inode->i_atime, &attr->ia_atime)) {
2609                         ceph_encode_timespec64(&req->r_args.setattr.atime,
2610                                                &attr->ia_atime);
2611                         mask |= CEPH_SETATTR_ATIME;
2612                         release |= CEPH_CAP_FILE_SHARED |
2613                                    CEPH_CAP_FILE_RD | CEPH_CAP_FILE_WR;
2614                 }
2615         }
2616         if (ia_valid & ATTR_SIZE) {
2617                 doutc(cl, "%p %llx.%llx size %lld -> %lld\n", inode,
2618                       ceph_vinop(inode), isize, attr->ia_size);
2619                 /*
2620                  * Only when the new size is smaller and not aligned to
2621                  * CEPH_FSCRYPT_BLOCK_SIZE will the RMW is needed.
2622                  */
2623                 if (IS_ENCRYPTED(inode) && attr->ia_size < isize &&
2624                     (attr->ia_size % CEPH_FSCRYPT_BLOCK_SIZE)) {
2625                         mask |= CEPH_SETATTR_SIZE;
2626                         release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_EXCL |
2627                                    CEPH_CAP_FILE_RD | CEPH_CAP_FILE_WR;
2628                         set_bit(CEPH_MDS_R_FSCRYPT_FILE, &req->r_req_flags);
2629                         mask |= CEPH_SETATTR_FSCRYPT_FILE;
2630                         req->r_args.setattr.size =
2631                                 cpu_to_le64(round_up(attr->ia_size,
2632                                                      CEPH_FSCRYPT_BLOCK_SIZE));
2633                         req->r_args.setattr.old_size =
2634                                 cpu_to_le64(round_up(isize,
2635                                                      CEPH_FSCRYPT_BLOCK_SIZE));
2636                         req->r_fscrypt_file = attr->ia_size;
2637                         fill_fscrypt = true;
2638                 } else if ((issued & CEPH_CAP_FILE_EXCL) && attr->ia_size >= isize) {
2639                         if (attr->ia_size > isize) {
2640                                 i_size_write(inode, attr->ia_size);
2641                                 inode->i_blocks = calc_inode_blocks(attr->ia_size);
2642                                 ci->i_reported_size = attr->ia_size;
2643                                 dirtied |= CEPH_CAP_FILE_EXCL;
2644                                 ia_valid |= ATTR_MTIME;
2645                         }
2646                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
2647                            attr->ia_size != isize) {
2648                         mask |= CEPH_SETATTR_SIZE;
2649                         release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_EXCL |
2650                                    CEPH_CAP_FILE_RD | CEPH_CAP_FILE_WR;
2651                         if (IS_ENCRYPTED(inode) && attr->ia_size) {
2652                                 set_bit(CEPH_MDS_R_FSCRYPT_FILE, &req->r_req_flags);
2653                                 mask |= CEPH_SETATTR_FSCRYPT_FILE;
2654                                 req->r_args.setattr.size =
2655                                         cpu_to_le64(round_up(attr->ia_size,
2656                                                              CEPH_FSCRYPT_BLOCK_SIZE));
2657                                 req->r_args.setattr.old_size =
2658                                         cpu_to_le64(round_up(isize,
2659                                                              CEPH_FSCRYPT_BLOCK_SIZE));
2660                                 req->r_fscrypt_file = attr->ia_size;
2661                         } else {
2662                                 req->r_args.setattr.size = cpu_to_le64(attr->ia_size);
2663                                 req->r_args.setattr.old_size = cpu_to_le64(isize);
2664                                 req->r_fscrypt_file = 0;
2665                         }
2666                 }
2667         }
2668         if (ia_valid & ATTR_MTIME) {
2669                 doutc(cl, "%p %llx.%llx mtime %lld.%ld -> %lld.%ld\n",
2670                       inode, ceph_vinop(inode), inode->i_mtime.tv_sec,
2671                       inode->i_mtime.tv_nsec, attr->ia_mtime.tv_sec,
2672                       attr->ia_mtime.tv_nsec);
2673                 if (issued & CEPH_CAP_FILE_EXCL) {
2674                         ci->i_time_warp_seq++;
2675                         inode->i_mtime = attr->ia_mtime;
2676                         dirtied |= CEPH_CAP_FILE_EXCL;
2677                 } else if ((issued & CEPH_CAP_FILE_WR) &&
2678                            timespec64_compare(&inode->i_mtime,
2679                                             &attr->ia_mtime) < 0) {
2680                         inode->i_mtime = attr->ia_mtime;
2681                         dirtied |= CEPH_CAP_FILE_WR;
2682                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
2683                            !timespec64_equal(&inode->i_mtime, &attr->ia_mtime)) {
2684                         ceph_encode_timespec64(&req->r_args.setattr.mtime,
2685                                                &attr->ia_mtime);
2686                         mask |= CEPH_SETATTR_MTIME;
2687                         release |= CEPH_CAP_FILE_SHARED |
2688                                    CEPH_CAP_FILE_RD | CEPH_CAP_FILE_WR;
2689                 }
2690         }
2691
2692         /* these do nothing */
2693         if (ia_valid & ATTR_CTIME) {
2694                 bool only = (ia_valid & (ATTR_SIZE|ATTR_MTIME|ATTR_ATIME|
2695                                          ATTR_MODE|ATTR_UID|ATTR_GID)) == 0;
2696                 doutc(cl, "%p %llx.%llx ctime %lld.%ld -> %lld.%ld (%s)\n",
2697                       inode, ceph_vinop(inode), inode_get_ctime(inode).tv_sec,
2698                       inode_get_ctime(inode).tv_nsec,
2699                       attr->ia_ctime.tv_sec, attr->ia_ctime.tv_nsec,
2700                       only ? "ctime only" : "ignored");
2701
2702                 if (only) {
2703                         /*
2704                          * if kernel wants to dirty ctime but nothing else,
2705                          * we need to choose a cap to dirty under, or do
2706                          * a almost-no-op setattr
2707                          */
2708                         if (issued & CEPH_CAP_AUTH_EXCL)
2709                                 dirtied |= CEPH_CAP_AUTH_EXCL;
2710                         else if (issued & CEPH_CAP_FILE_EXCL)
2711                                 dirtied |= CEPH_CAP_FILE_EXCL;
2712                         else if (issued & CEPH_CAP_XATTR_EXCL)
2713                                 dirtied |= CEPH_CAP_XATTR_EXCL;
2714                         else
2715                                 mask |= CEPH_SETATTR_CTIME;
2716                 }
2717         }
2718         if (ia_valid & ATTR_FILE)
2719                 doutc(cl, "%p %llx.%llx ATTR_FILE ... hrm!\n", inode,
2720                       ceph_vinop(inode));
2721
2722         if (dirtied) {
2723                 inode_dirty_flags = __ceph_mark_dirty_caps(ci, dirtied,
2724                                                            &prealloc_cf);
2725                 inode_set_ctime_to_ts(inode, attr->ia_ctime);
2726                 inode_inc_iversion_raw(inode);
2727         }
2728
2729         release &= issued;
2730         spin_unlock(&ci->i_ceph_lock);
2731         if (lock_snap_rwsem) {
2732                 up_read(&mdsc->snap_rwsem);
2733                 lock_snap_rwsem = false;
2734         }
2735
2736         if (inode_dirty_flags)
2737                 __mark_inode_dirty(inode, inode_dirty_flags);
2738
2739         if (mask) {
2740                 req->r_inode = inode;
2741                 ihold(inode);
2742                 req->r_inode_drop = release;
2743                 req->r_args.setattr.mask = cpu_to_le32(mask);
2744                 req->r_num_caps = 1;
2745                 req->r_stamp = attr->ia_ctime;
2746                 if (fill_fscrypt) {
2747                         err = fill_fscrypt_truncate(inode, req, attr);
2748                         if (err)
2749                                 goto out;
2750                 }
2751
2752                 /*
2753                  * The truncate request will return -EAGAIN when the
2754                  * last block has been updated just before the MDS
2755                  * successfully gets the xlock for the FILE lock. To
2756                  * avoid corrupting the file contents we need to retry
2757                  * it.
2758                  */
2759                 err = ceph_mdsc_do_request(mdsc, NULL, req);
2760                 if (err == -EAGAIN && truncate_retry--) {
2761                         doutc(cl, "%p %llx.%llx result=%d (%s locally, %d remote), retry it!\n",
2762                               inode, ceph_vinop(inode), err,
2763                               ceph_cap_string(dirtied), mask);
2764                         ceph_mdsc_put_request(req);
2765                         ceph_free_cap_flush(prealloc_cf);
2766                         goto retry;
2767                 }
2768         }
2769 out:
2770         doutc(cl, "%p %llx.%llx result=%d (%s locally, %d remote)\n", inode,
2771               ceph_vinop(inode), err, ceph_cap_string(dirtied), mask);
2772
2773         ceph_mdsc_put_request(req);
2774         ceph_free_cap_flush(prealloc_cf);
2775
2776         if (err >= 0 && (mask & CEPH_SETATTR_SIZE))
2777                 __ceph_do_pending_vmtruncate(inode);
2778
2779         return err;
2780 }
2781
2782 /*
2783  * setattr
2784  */
2785 int ceph_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
2786                  struct iattr *attr)
2787 {
2788         struct inode *inode = d_inode(dentry);
2789         struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);
2790         int err;
2791
2792         if (ceph_snap(inode) != CEPH_NOSNAP)
2793                 return -EROFS;
2794
2795         if (ceph_inode_is_shutdown(inode))
2796                 return -ESTALE;
2797
2798         err = fscrypt_prepare_setattr(dentry, attr);
2799         if (err)
2800                 return err;
2801
2802         err = setattr_prepare(&nop_mnt_idmap, dentry, attr);
2803         if (err != 0)
2804                 return err;
2805
2806         if ((attr->ia_valid & ATTR_SIZE) &&
2807             attr->ia_size > max(i_size_read(inode), fsc->max_file_size))
2808                 return -EFBIG;
2809
2810         if ((attr->ia_valid & ATTR_SIZE) &&
2811             ceph_quota_is_max_bytes_exceeded(inode, attr->ia_size))
2812                 return -EDQUOT;
2813
2814         err = __ceph_setattr(inode, attr, NULL);
2815
2816         if (err >= 0 && (attr->ia_valid & ATTR_MODE))
2817                 err = posix_acl_chmod(&nop_mnt_idmap, dentry, attr->ia_mode);
2818
2819         return err;
2820 }
2821
2822 int ceph_try_to_choose_auth_mds(struct inode *inode, int mask)
2823 {
2824         int issued = ceph_caps_issued(ceph_inode(inode));
2825
2826         /*
2827          * If any 'x' caps is issued we can just choose the auth MDS
2828          * instead of the random replica MDSes. Because only when the
2829          * Locker is in LOCK_EXEC state will the loner client could
2830          * get the 'x' caps. And if we send the getattr requests to
2831          * any replica MDS it must auth pin and tries to rdlock from
2832          * the auth MDS, and then the auth MDS need to do the Locker
2833          * state transition to LOCK_SYNC. And after that the lock state
2834          * will change back.
2835          *
2836          * This cost much when doing the Locker state transition and
2837          * usually will need to revoke caps from clients.
2838          *
2839          * And for the 'Xs' caps for getxattr we will also choose the
2840          * auth MDS, because the MDS side code is buggy due to setxattr
2841          * won't notify the replica MDSes when the values changed and
2842          * the replica MDS will return the old values. Though we will
2843          * fix it in MDS code, but this still makes sense for old ceph.
2844          */
2845         if (((mask & CEPH_CAP_ANY_SHARED) && (issued & CEPH_CAP_ANY_EXCL))
2846             || (mask & (CEPH_STAT_RSTAT | CEPH_STAT_CAP_XATTR)))
2847                 return USE_AUTH_MDS;
2848         else
2849                 return USE_ANY_MDS;
2850 }
2851
2852 /*
2853  * Verify that we have a lease on the given mask.  If not,
2854  * do a getattr against an mds.
2855  */
2856 int __ceph_do_getattr(struct inode *inode, struct page *locked_page,
2857                       int mask, bool force)
2858 {
2859         struct ceph_fs_client *fsc = ceph_sb_to_fs_client(inode->i_sb);
2860         struct ceph_client *cl = fsc->client;
2861         struct ceph_mds_client *mdsc = fsc->mdsc;
2862         struct ceph_mds_request *req;
2863         int mode;
2864         int err;
2865
2866         if (ceph_snap(inode) == CEPH_SNAPDIR) {
2867                 doutc(cl, "inode %p %llx.%llx SNAPDIR\n", inode,
2868                       ceph_vinop(inode));
2869                 return 0;
2870         }
2871
2872         doutc(cl, "inode %p %llx.%llx mask %s mode 0%o\n", inode,
2873               ceph_vinop(inode), ceph_cap_string(mask), inode->i_mode);
2874         if (!force && ceph_caps_issued_mask_metric(ceph_inode(inode), mask, 1))
2875                         return 0;
2876
2877         mode = ceph_try_to_choose_auth_mds(inode, mask);
2878         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, mode);
2879         if (IS_ERR(req))
2880                 return PTR_ERR(req);
2881         req->r_inode = inode;
2882         ihold(inode);
2883         req->r_num_caps = 1;
2884         req->r_args.getattr.mask = cpu_to_le32(mask);
2885         req->r_locked_page = locked_page;
2886         err = ceph_mdsc_do_request(mdsc, NULL, req);
2887         if (locked_page && err == 0) {
2888                 u64 inline_version = req->r_reply_info.targeti.inline_version;
2889                 if (inline_version == 0) {
2890                         /* the reply is supposed to contain inline data */
2891                         err = -EINVAL;
2892                 } else if (inline_version == CEPH_INLINE_NONE ||
2893                            inline_version == 1) {
2894                         err = -ENODATA;
2895                 } else {
2896                         err = req->r_reply_info.targeti.inline_len;
2897                 }
2898         }
2899         ceph_mdsc_put_request(req);
2900         doutc(cl, "result=%d\n", err);
2901         return err;
2902 }
2903
2904 int ceph_do_getvxattr(struct inode *inode, const char *name, void *value,
2905                       size_t size)
2906 {
2907         struct ceph_fs_client *fsc = ceph_sb_to_fs_client(inode->i_sb);
2908         struct ceph_client *cl = fsc->client;
2909         struct ceph_mds_client *mdsc = fsc->mdsc;
2910         struct ceph_mds_request *req;
2911         int mode = USE_AUTH_MDS;
2912         int err;
2913         char *xattr_value;
2914         size_t xattr_value_len;
2915
2916         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETVXATTR, mode);
2917         if (IS_ERR(req)) {
2918                 err = -ENOMEM;
2919                 goto out;
2920         }
2921
2922         req->r_feature_needed = CEPHFS_FEATURE_OP_GETVXATTR;
2923         req->r_path2 = kstrdup(name, GFP_NOFS);
2924         if (!req->r_path2) {
2925                 err = -ENOMEM;
2926                 goto put;
2927         }
2928
2929         ihold(inode);
2930         req->r_inode = inode;
2931         err = ceph_mdsc_do_request(mdsc, NULL, req);
2932         if (err < 0)
2933                 goto put;
2934
2935         xattr_value = req->r_reply_info.xattr_info.xattr_value;
2936         xattr_value_len = req->r_reply_info.xattr_info.xattr_value_len;
2937
2938         doutc(cl, "xattr_value_len:%zu, size:%zu\n", xattr_value_len, size);
2939
2940         err = (int)xattr_value_len;
2941         if (size == 0)
2942                 goto put;
2943
2944         if (xattr_value_len > size) {
2945                 err = -ERANGE;
2946                 goto put;
2947         }
2948
2949         memcpy(value, xattr_value, xattr_value_len);
2950 put:
2951         ceph_mdsc_put_request(req);
2952 out:
2953         doutc(cl, "result=%d\n", err);
2954         return err;
2955 }
2956
2957
2958 /*
2959  * Check inode permissions.  We verify we have a valid value for
2960  * the AUTH cap, then call the generic handler.
2961  */
2962 int ceph_permission(struct mnt_idmap *idmap, struct inode *inode,
2963                     int mask)
2964 {
2965         int err;
2966
2967         if (mask & MAY_NOT_BLOCK)
2968                 return -ECHILD;
2969
2970         err = ceph_do_getattr(inode, CEPH_CAP_AUTH_SHARED, false);
2971
2972         if (!err)
2973                 err = generic_permission(&nop_mnt_idmap, inode, mask);
2974         return err;
2975 }
2976
2977 /* Craft a mask of needed caps given a set of requested statx attrs. */
2978 static int statx_to_caps(u32 want, umode_t mode)
2979 {
2980         int mask = 0;
2981
2982         if (want & (STATX_MODE|STATX_UID|STATX_GID|STATX_CTIME|STATX_BTIME|STATX_CHANGE_COOKIE))
2983                 mask |= CEPH_CAP_AUTH_SHARED;
2984
2985         if (want & (STATX_NLINK|STATX_CTIME|STATX_CHANGE_COOKIE)) {
2986                 /*
2987                  * The link count for directories depends on inode->i_subdirs,
2988                  * and that is only updated when Fs caps are held.
2989                  */
2990                 if (S_ISDIR(mode))
2991                         mask |= CEPH_CAP_FILE_SHARED;
2992                 else
2993                         mask |= CEPH_CAP_LINK_SHARED;
2994         }
2995
2996         if (want & (STATX_ATIME|STATX_MTIME|STATX_CTIME|STATX_SIZE|STATX_BLOCKS|STATX_CHANGE_COOKIE))
2997                 mask |= CEPH_CAP_FILE_SHARED;
2998
2999         if (want & (STATX_CTIME|STATX_CHANGE_COOKIE))
3000                 mask |= CEPH_CAP_XATTR_SHARED;
3001
3002         return mask;
3003 }
3004
3005 /*
3006  * Get all the attributes. If we have sufficient caps for the requested attrs,
3007  * then we can avoid talking to the MDS at all.
3008  */
3009 int ceph_getattr(struct mnt_idmap *idmap, const struct path *path,
3010                  struct kstat *stat, u32 request_mask, unsigned int flags)
3011 {
3012         struct inode *inode = d_inode(path->dentry);
3013         struct super_block *sb = inode->i_sb;
3014         struct ceph_inode_info *ci = ceph_inode(inode);
3015         u32 valid_mask = STATX_BASIC_STATS;
3016         int err = 0;
3017
3018         if (ceph_inode_is_shutdown(inode))
3019                 return -ESTALE;
3020
3021         /* Skip the getattr altogether if we're asked not to sync */
3022         if ((flags & AT_STATX_SYNC_TYPE) != AT_STATX_DONT_SYNC) {
3023                 err = ceph_do_getattr(inode,
3024                                 statx_to_caps(request_mask, inode->i_mode),
3025                                 flags & AT_STATX_FORCE_SYNC);
3026                 if (err)
3027                         return err;
3028         }
3029
3030         generic_fillattr(&nop_mnt_idmap, request_mask, inode, stat);
3031         stat->ino = ceph_present_inode(inode);
3032
3033         /*
3034          * btime on newly-allocated inodes is 0, so if this is still set to
3035          * that, then assume that it's not valid.
3036          */
3037         if (ci->i_btime.tv_sec || ci->i_btime.tv_nsec) {
3038                 stat->btime = ci->i_btime;
3039                 valid_mask |= STATX_BTIME;
3040         }
3041
3042         if (request_mask & STATX_CHANGE_COOKIE) {
3043                 stat->change_cookie = inode_peek_iversion_raw(inode);
3044                 valid_mask |= STATX_CHANGE_COOKIE;
3045         }
3046
3047         if (ceph_snap(inode) == CEPH_NOSNAP)
3048                 stat->dev = sb->s_dev;
3049         else
3050                 stat->dev = ci->i_snapid_map ? ci->i_snapid_map->dev : 0;
3051
3052         if (S_ISDIR(inode->i_mode)) {
3053                 if (ceph_test_mount_opt(ceph_sb_to_fs_client(sb), RBYTES)) {
3054                         stat->size = ci->i_rbytes;
3055                 } else if (ceph_snap(inode) == CEPH_SNAPDIR) {
3056                         struct ceph_inode_info *pci;
3057                         struct ceph_snap_realm *realm;
3058                         struct inode *parent;
3059
3060                         parent = ceph_lookup_inode(sb, ceph_ino(inode));
3061                         if (IS_ERR(parent))
3062                                 return PTR_ERR(parent);
3063
3064                         pci = ceph_inode(parent);
3065                         spin_lock(&pci->i_ceph_lock);
3066                         realm = pci->i_snap_realm;
3067                         if (realm)
3068                                 stat->size = realm->num_snaps;
3069                         else
3070                                 stat->size = 0;
3071                         spin_unlock(&pci->i_ceph_lock);
3072                         iput(parent);
3073                 } else {
3074                         stat->size = ci->i_files + ci->i_subdirs;
3075                 }
3076                 stat->blocks = 0;
3077                 stat->blksize = 65536;
3078                 /*
3079                  * Some applications rely on the number of st_nlink
3080                  * value on directories to be either 0 (if unlinked)
3081                  * or 2 + number of subdirectories.
3082                  */
3083                 if (stat->nlink == 1)
3084                         /* '.' + '..' + subdirs */
3085                         stat->nlink = 1 + 1 + ci->i_subdirs;
3086         }
3087
3088         stat->attributes |= STATX_ATTR_CHANGE_MONOTONIC;
3089         if (IS_ENCRYPTED(inode))
3090                 stat->attributes |= STATX_ATTR_ENCRYPTED;
3091         stat->attributes_mask |= (STATX_ATTR_CHANGE_MONOTONIC |
3092                                   STATX_ATTR_ENCRYPTED);
3093
3094         stat->result_mask = request_mask & valid_mask;
3095         return err;
3096 }
3097
3098 void ceph_inode_shutdown(struct inode *inode)
3099 {
3100         struct ceph_inode_info *ci = ceph_inode(inode);
3101         struct rb_node *p;
3102         int iputs = 0;
3103         bool invalidate = false;
3104
3105         spin_lock(&ci->i_ceph_lock);
3106         ci->i_ceph_flags |= CEPH_I_SHUTDOWN;
3107         p = rb_first(&ci->i_caps);
3108         while (p) {
3109                 struct ceph_cap *cap = rb_entry(p, struct ceph_cap, ci_node);
3110
3111                 p = rb_next(p);
3112                 iputs += ceph_purge_inode_cap(inode, cap, &invalidate);
3113         }
3114         spin_unlock(&ci->i_ceph_lock);
3115
3116         if (invalidate)
3117                 ceph_queue_invalidate(inode);
3118         while (iputs--)
3119                 iput(inode);
3120 }