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_set_mtime_to_ts(inode, inode_get_mtime(parent));
 193         inode_set_ctime_to_ts(inode, inode_get_ctime(parent));
 194         inode_set_atime_to_ts(inode, inode_get_atime(parent));
 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_get_mtime_sec(inode),
 852                              inode_get_mtime_nsec(inode),
 853                              mtime->tv_sec, mtime->tv_nsec,
 854                              ci->i_time_warp_seq, (int)time_warp_seq);
 855
 856                         inode_set_mtime_to_ts(inode, *mtime);
 857                         inode_set_atime_to_ts(inode, *atime);
 858                         ci->i_time_warp_seq = time_warp_seq;
 859                 } else if (time_warp_seq == ci->i_time_warp_seq) {
 860                         struct timespec64       ts;
 861
 862                         /* nobody did utimes(); take the max */
 863                         ts = inode_get_mtime(inode);
 864                         if (timespec64_compare(mtime, &ts) > 0) {
 865                                 doutc(cl, "mtime %lld.%09ld -> %lld.%09ld inc\n",
 866                                      ts.tv_sec, ts.tv_nsec,
 867                                      mtime->tv_sec, mtime->tv_nsec);
 868                                 inode_set_mtime_to_ts(inode, *mtime);
 869                         }
 870                         ts = inode_get_atime(inode);
 871                         if (timespec64_compare(atime, &ts) > 0) {
 872                                 doutc(cl, "atime %lld.%09ld -> %lld.%09ld inc\n",
 873                                      ts.tv_sec, ts.tv_nsec,
 874                                      atime->tv_sec, atime->tv_nsec);
 875                                 inode_set_atime_to_ts(inode, *atime);
 876                         }
 877                 } else if (issued & CEPH_CAP_FILE_EXCL) {
 878                         /* we did a utimes(); ignore mds values */
 879                 } else {
 880                         warn = 1;
 881                 }
 882         } else {
 883                 /* we have no write|excl caps; whatever the MDS says is true */
 884                 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) >= 0) {
 885                         inode_set_ctime_to_ts(inode, *ctime);
 886                         inode_set_mtime_to_ts(inode, *mtime);
 887                         inode_set_atime_to_ts(inode, *atime);
 888                         ci->i_time_warp_seq = time_warp_seq;
 889                 } else {
 890                         warn = 1;
 891                 }
 892         }
 893         if (warn) /* time_warp_seq shouldn't go backwards */
 894                 doutc(cl, "%p mds time_warp_seq %llu < %u\n", inode,
 895                       time_warp_seq, ci->i_time_warp_seq);
 896 }
 897
 898 #if IS_ENABLED(CONFIG_FS_ENCRYPTION)
 899 static int decode_encrypted_symlink(struct ceph_mds_client *mdsc,
 900                                     const char *encsym,
 901                                     int enclen, u8 **decsym)
 902 {
 903         struct ceph_client *cl = mdsc->fsc->client;
 904         int declen;
 905         u8 *sym;
 906
 907         sym = kmalloc(enclen + 1, GFP_NOFS);
 908         if (!sym)
 909                 return -ENOMEM;
 910
 911         declen = ceph_base64_decode(encsym, enclen, sym);
 912         if (declen < 0) {
 913                 pr_err_client(cl,
 914                         "can't decode symlink (%d). Content: %.*s\n",
 915                         declen, enclen, encsym);
 916                 kfree(sym);
 917                 return -EIO;
 918         }
 919         sym[declen + 1] = '\0';
 920         *decsym = sym;
 921         return declen;
 922 }
 923 #else
 924 static int decode_encrypted_symlink(struct ceph_mds_client *mdsc,
 925                                     const char *encsym,
 926                                     int symlen, u8 **decsym)
 927 {
 928         return -EOPNOTSUPP;
 929 }
 930 #endif
 931
 932 /*
 933  * Populate an inode based on info from mds.  May be called on new or
 934  * existing inodes.
 935  */
 936 int ceph_fill_inode(struct inode *inode, struct page *locked_page,
 937                     struct ceph_mds_reply_info_in *iinfo,
 938                     struct ceph_mds_reply_dirfrag *dirinfo,
 939                     struct ceph_mds_session *session, int cap_fmode,
 940                     struct ceph_cap_reservation *caps_reservation)
 941 {
 942         struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb);
 943         struct ceph_client *cl = mdsc->fsc->client;
 944         struct ceph_mds_reply_inode *info = iinfo->in;
 945         struct ceph_inode_info *ci = ceph_inode(inode);
 946         int issued, new_issued, info_caps;
 947         struct timespec64 mtime, atime, ctime;
 948         struct ceph_buffer *xattr_blob = NULL;
 949         struct ceph_buffer *old_blob = NULL;
 950         struct ceph_string *pool_ns = NULL;
 951         struct ceph_cap *new_cap = NULL;
 952         int err = 0;
 953         bool wake = false;
 954         bool queue_trunc = false;
 955         bool new_version = false;
 956         bool fill_inline = false;
 957         umode_t mode = le32_to_cpu(info->mode);
 958         dev_t rdev = le32_to_cpu(info->rdev);
 959
 960         lockdep_assert_held(&mdsc->snap_rwsem);
 961
 962         doutc(cl, "%p ino %llx.%llx v %llu had %llu\n", inode, ceph_vinop(inode),
 963               le64_to_cpu(info->version), ci->i_version);
 964
 965         /* Once I_NEW is cleared, we can't change type or dev numbers */
 966         if (inode->i_state & I_NEW) {
 967                 inode->i_mode = mode;
 968         } else {
 969                 if (inode_wrong_type(inode, mode)) {
 970                         pr_warn_once_client(cl,
 971                                 "inode type changed! (ino %llx.%llx is 0%o, mds says 0%o)\n",
 972                                 ceph_vinop(inode), inode->i_mode, mode);
 973                         return -ESTALE;
 974                 }
 975
 976                 if ((S_ISCHR(mode) || S_ISBLK(mode)) && inode->i_rdev != rdev) {
 977                         pr_warn_once_client(cl,
 978                                 "dev inode rdev changed! (ino %llx.%llx is %u:%u, mds says %u:%u)\n",
 979                                 ceph_vinop(inode), MAJOR(inode->i_rdev),
 980                                 MINOR(inode->i_rdev), MAJOR(rdev),
 981                                 MINOR(rdev));
 982                         return -ESTALE;
 983                 }
 984         }
 985
 986         info_caps = le32_to_cpu(info->cap.caps);
 987
 988         /* prealloc new cap struct */
 989         if (info_caps && ceph_snap(inode) == CEPH_NOSNAP) {
 990                 new_cap = ceph_get_cap(mdsc, caps_reservation);
 991                 if (!new_cap)
 992                         return -ENOMEM;
 993         }
 994
 995         /*
 996          * prealloc xattr data, if it looks like we'll need it.  only
 997          * if len > 4 (meaning there are actually xattrs; the first 4
 998          * bytes are the xattr count).
 999          */
1000         if (iinfo->xattr_len > 4) {
1001                 xattr_blob = ceph_buffer_new(iinfo->xattr_len, GFP_NOFS);
1002                 if (!xattr_blob)
1003                         pr_err_client(cl, "ENOMEM xattr blob %d bytes\n",
1004                                       iinfo->xattr_len);
1005         }
1006
1007         if (iinfo->pool_ns_len > 0)
1008                 pool_ns = ceph_find_or_create_string(iinfo->pool_ns_data,
1009                                                      iinfo->pool_ns_len);
1010
1011         if (ceph_snap(inode) != CEPH_NOSNAP && !ci->i_snapid_map)
1012                 ci->i_snapid_map = ceph_get_snapid_map(mdsc, ceph_snap(inode));
1013
1014         spin_lock(&ci->i_ceph_lock);
1015
1016         /*
1017          * provided version will be odd if inode value is projected,
1018          * even if stable.  skip the update if we have newer stable
1019          * info (ours>=theirs, e.g. due to racing mds replies), unless
1020          * we are getting projected (unstable) info (in which case the
1021          * version is odd, and we want ours>theirs).
1022          *   us   them
1023          *   2    2     skip
1024          *   3    2     skip
1025          *   3    3     update
1026          */
1027         if (ci->i_version == 0 ||
1028             ((info->cap.flags & CEPH_CAP_FLAG_AUTH) &&
1029              le64_to_cpu(info->version) > (ci->i_version & ~1)))
1030                 new_version = true;
1031
1032         /* Update change_attribute */
1033         inode_set_max_iversion_raw(inode, iinfo->change_attr);
1034
1035         __ceph_caps_issued(ci, &issued);
1036         issued |= __ceph_caps_dirty(ci);
1037         new_issued = ~issued & info_caps;
1038
1039         __ceph_update_quota(ci, iinfo->max_bytes, iinfo->max_files);
1040
1041 #ifdef CONFIG_FS_ENCRYPTION
1042         if (iinfo->fscrypt_auth_len &&
1043             ((inode->i_state & I_NEW) || (ci->fscrypt_auth_len == 0))) {
1044                 kfree(ci->fscrypt_auth);
1045                 ci->fscrypt_auth_len = iinfo->fscrypt_auth_len;
1046                 ci->fscrypt_auth = iinfo->fscrypt_auth;
1047                 iinfo->fscrypt_auth = NULL;
1048                 iinfo->fscrypt_auth_len = 0;
1049                 inode_set_flags(inode, S_ENCRYPTED, S_ENCRYPTED);
1050         }
1051 #endif
1052
1053         if ((new_version || (new_issued & CEPH_CAP_AUTH_SHARED)) &&
1054             (issued & CEPH_CAP_AUTH_EXCL) == 0) {
1055                 inode->i_mode = mode;
1056                 inode->i_uid = make_kuid(&init_user_ns, le32_to_cpu(info->uid));
1057                 inode->i_gid = make_kgid(&init_user_ns, le32_to_cpu(info->gid));
1058                 doutc(cl, "%p %llx.%llx mode 0%o uid.gid %d.%d\n", inode,
1059                       ceph_vinop(inode), inode->i_mode,
1060                       from_kuid(&init_user_ns, inode->i_uid),
1061                       from_kgid(&init_user_ns, inode->i_gid));
1062                 ceph_decode_timespec64(&ci->i_btime, &iinfo->btime);
1063                 ceph_decode_timespec64(&ci->i_snap_btime, &iinfo->snap_btime);
1064         }
1065
1066         /* directories have fl_stripe_unit set to zero */
1067         if (IS_ENCRYPTED(inode))
1068                 inode->i_blkbits = CEPH_FSCRYPT_BLOCK_SHIFT;
1069         else if (le32_to_cpu(info->layout.fl_stripe_unit))
1070                 inode->i_blkbits =
1071                         fls(le32_to_cpu(info->layout.fl_stripe_unit)) - 1;
1072         else
1073                 inode->i_blkbits = CEPH_BLOCK_SHIFT;
1074
1075         if ((new_version || (new_issued & CEPH_CAP_LINK_SHARED)) &&
1076             (issued & CEPH_CAP_LINK_EXCL) == 0)
1077                 set_nlink(inode, le32_to_cpu(info->nlink));
1078
1079         if (new_version || (new_issued & CEPH_CAP_ANY_RD)) {
1080                 /* be careful with mtime, atime, size */
1081                 ceph_decode_timespec64(&atime, &info->atime);
1082                 ceph_decode_timespec64(&mtime, &info->mtime);
1083                 ceph_decode_timespec64(&ctime, &info->ctime);
1084                 ceph_fill_file_time(inode, issued,
1085                                 le32_to_cpu(info->time_warp_seq),
1086                                 &ctime, &mtime, &atime);
1087         }
1088
1089         if (new_version || (info_caps & CEPH_CAP_FILE_SHARED)) {
1090                 ci->i_files = le64_to_cpu(info->files);
1091                 ci->i_subdirs = le64_to_cpu(info->subdirs);
1092         }
1093
1094         if (new_version ||
1095             (new_issued & (CEPH_CAP_ANY_FILE_RD | CEPH_CAP_ANY_FILE_WR))) {
1096                 u64 size = le64_to_cpu(info->size);
1097                 s64 old_pool = ci->i_layout.pool_id;
1098                 struct ceph_string *old_ns;
1099
1100                 ceph_file_layout_from_legacy(&ci->i_layout, &info->layout);
1101                 old_ns = rcu_dereference_protected(ci->i_layout.pool_ns,
1102                                         lockdep_is_held(&ci->i_ceph_lock));
1103                 rcu_assign_pointer(ci->i_layout.pool_ns, pool_ns);
1104
1105                 if (ci->i_layout.pool_id != old_pool || pool_ns != old_ns)
1106                         ci->i_ceph_flags &= ~CEPH_I_POOL_PERM;
1107
1108                 pool_ns = old_ns;
1109
1110                 if (IS_ENCRYPTED(inode) && size &&
1111                     iinfo->fscrypt_file_len == sizeof(__le64)) {
1112                         u64 fsize = __le64_to_cpu(*(__le64 *)iinfo->fscrypt_file);
1113
1114                         if (size == round_up(fsize, CEPH_FSCRYPT_BLOCK_SIZE)) {
1115                                 size = fsize;
1116                         } else {
1117                                 pr_warn_client(cl,
1118                                         "fscrypt size mismatch: size=%llu fscrypt_file=%llu, discarding fscrypt_file size.\n",
1119                                         info->size, size);
1120                         }
1121                 }
1122
1123                 queue_trunc = ceph_fill_file_size(inode, issued,
1124                                         le32_to_cpu(info->truncate_seq),
1125                                         le64_to_cpu(info->truncate_size),
1126                                         size);
1127                 /* only update max_size on auth cap */
1128                 if ((info->cap.flags & CEPH_CAP_FLAG_AUTH) &&
1129                     ci->i_max_size != le64_to_cpu(info->max_size)) {
1130                         doutc(cl, "max_size %lld -> %llu\n",
1131                             ci->i_max_size, le64_to_cpu(info->max_size));
1132                         ci->i_max_size = le64_to_cpu(info->max_size);
1133                 }
1134         }
1135
1136         /* layout and rstat are not tracked by capability, update them if
1137          * the inode info is from auth mds */
1138         if (new_version || (info->cap.flags & CEPH_CAP_FLAG_AUTH)) {
1139                 if (S_ISDIR(inode->i_mode)) {
1140                         ci->i_dir_layout = iinfo->dir_layout;
1141                         ci->i_rbytes = le64_to_cpu(info->rbytes);
1142                         ci->i_rfiles = le64_to_cpu(info->rfiles);
1143                         ci->i_rsubdirs = le64_to_cpu(info->rsubdirs);
1144                         ci->i_dir_pin = iinfo->dir_pin;
1145                         ci->i_rsnaps = iinfo->rsnaps;
1146                         ceph_decode_timespec64(&ci->i_rctime, &info->rctime);
1147                 }
1148         }
1149
1150         /* xattrs */
1151         /* note that if i_xattrs.len <= 4, i_xattrs.data will still be NULL. */
1152         if ((ci->i_xattrs.version == 0 || !(issued & CEPH_CAP_XATTR_EXCL))  &&
1153             le64_to_cpu(info->xattr_version) > ci->i_xattrs.version) {
1154                 if (ci->i_xattrs.blob)
1155                         old_blob = ci->i_xattrs.blob;
1156                 ci->i_xattrs.blob = xattr_blob;
1157                 if (xattr_blob)
1158                         memcpy(ci->i_xattrs.blob->vec.iov_base,
1159                                iinfo->xattr_data, iinfo->xattr_len);
1160                 ci->i_xattrs.version = le64_to_cpu(info->xattr_version);
1161                 ceph_forget_all_cached_acls(inode);
1162                 ceph_security_invalidate_secctx(inode);
1163                 xattr_blob = NULL;
1164         }
1165
1166         /* finally update i_version */
1167         if (le64_to_cpu(info->version) > ci->i_version)
1168                 ci->i_version = le64_to_cpu(info->version);
1169
1170         inode->i_mapping->a_ops = &ceph_aops;
1171
1172         switch (inode->i_mode & S_IFMT) {
1173         case S_IFIFO:
1174         case S_IFBLK:
1175         case S_IFCHR:
1176         case S_IFSOCK:
1177                 inode->i_blkbits = PAGE_SHIFT;
1178                 init_special_inode(inode, inode->i_mode, rdev);
1179                 inode->i_op = &ceph_file_iops;
1180                 break;
1181         case S_IFREG:
1182                 inode->i_op = &ceph_file_iops;
1183                 inode->i_fop = &ceph_file_fops;
1184                 break;
1185         case S_IFLNK:
1186                 if (!ci->i_symlink) {
1187                         u32 symlen = iinfo->symlink_len;
1188                         char *sym;
1189
1190                         spin_unlock(&ci->i_ceph_lock);
1191
1192                         if (IS_ENCRYPTED(inode)) {
1193                                 if (symlen != i_size_read(inode))
1194                                         pr_err_client(cl,
1195                                                 "%p %llx.%llx BAD symlink size %lld\n",
1196                                                 inode, ceph_vinop(inode),
1197                                                 i_size_read(inode));
1198
1199                                 err = decode_encrypted_symlink(mdsc, iinfo->symlink,
1200                                                                symlen, (u8 **)&sym);
1201                                 if (err < 0) {
1202                                         pr_err_client(cl,
1203                                                 "decoding encrypted symlink failed: %d\n",
1204                                                 err);
1205                                         goto out;
1206                                 }
1207                                 symlen = err;
1208                                 i_size_write(inode, symlen);
1209                                 inode->i_blocks = calc_inode_blocks(symlen);
1210                         } else {
1211                                 if (symlen != i_size_read(inode)) {
1212                                         pr_err_client(cl,
1213                                                 "%p %llx.%llx BAD symlink size %lld\n",
1214                                                 inode, ceph_vinop(inode),
1215                                                 i_size_read(inode));
1216                                         i_size_write(inode, symlen);
1217                                         inode->i_blocks = calc_inode_blocks(symlen);
1218                                 }
1219
1220                                 err = -ENOMEM;
1221                                 sym = kstrndup(iinfo->symlink, symlen, GFP_NOFS);
1222                                 if (!sym)
1223                                         goto out;
1224                         }
1225
1226                         spin_lock(&ci->i_ceph_lock);
1227                         if (!ci->i_symlink)
1228                                 ci->i_symlink = sym;
1229                         else
1230                                 kfree(sym); /* lost a race */
1231                 }
1232
1233                 if (IS_ENCRYPTED(inode)) {
1234                         /*
1235                          * Encrypted symlinks need to be decrypted before we can
1236                          * cache their targets in i_link. Don't touch it here.
1237                          */
1238                         inode->i_op = &ceph_encrypted_symlink_iops;
1239                 } else {
1240                         inode->i_link = ci->i_symlink;
1241                         inode->i_op = &ceph_symlink_iops;
1242                 }
1243                 break;
1244         case S_IFDIR:
1245                 inode->i_op = &ceph_dir_iops;
1246                 inode->i_fop = &ceph_dir_fops;
1247                 break;
1248         default:
1249                 pr_err_client(cl, "%p %llx.%llx BAD mode 0%o\n", inode,
1250                               ceph_vinop(inode), inode->i_mode);
1251         }
1252
1253         /* were we issued a capability? */
1254         if (info_caps) {
1255                 if (ceph_snap(inode) == CEPH_NOSNAP) {
1256                         ceph_add_cap(inode, session,
1257                                      le64_to_cpu(info->cap.cap_id),
1258                                      info_caps,
1259                                      le32_to_cpu(info->cap.wanted),
1260                                      le32_to_cpu(info->cap.seq),
1261                                      le32_to_cpu(info->cap.mseq),
1262                                      le64_to_cpu(info->cap.realm),
1263                                      info->cap.flags, &new_cap);
1264
1265                         /* set dir completion flag? */
1266                         if (S_ISDIR(inode->i_mode) &&
1267                             ci->i_files == 0 && ci->i_subdirs == 0 &&
1268                             (info_caps & CEPH_CAP_FILE_SHARED) &&
1269                             (issued & CEPH_CAP_FILE_EXCL) == 0 &&
1270                             !__ceph_dir_is_complete(ci)) {
1271                                 doutc(cl, " marking %p complete (empty)\n",
1272                                       inode);
1273                                 i_size_write(inode, 0);
1274                                 __ceph_dir_set_complete(ci,
1275                                         atomic64_read(&ci->i_release_count),
1276                                         atomic64_read(&ci->i_ordered_count));
1277                         }
1278
1279                         wake = true;
1280                 } else {
1281                         doutc(cl, " %p got snap_caps %s\n", inode,
1282                               ceph_cap_string(info_caps));
1283                         ci->i_snap_caps |= info_caps;
1284                 }
1285         }
1286
1287         if (iinfo->inline_version > 0 &&
1288             iinfo->inline_version >= ci->i_inline_version) {
1289                 int cache_caps = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO;
1290                 ci->i_inline_version = iinfo->inline_version;
1291                 if (ceph_has_inline_data(ci) &&
1292                     (locked_page || (info_caps & cache_caps)))
1293                         fill_inline = true;
1294         }
1295
1296         if (cap_fmode >= 0) {
1297                 if (!info_caps)
1298                         pr_warn_client(cl, "mds issued no caps on %llx.%llx\n",
1299                                        ceph_vinop(inode));
1300                 __ceph_touch_fmode(ci, mdsc, cap_fmode);
1301         }
1302
1303         spin_unlock(&ci->i_ceph_lock);
1304
1305         ceph_fscache_register_inode_cookie(inode);
1306
1307         if (fill_inline)
1308                 ceph_fill_inline_data(inode, locked_page,
1309                                       iinfo->inline_data, iinfo->inline_len);
1310
1311         if (wake)
1312                 wake_up_all(&ci->i_cap_wq);
1313
1314         /* queue truncate if we saw i_size decrease */
1315         if (queue_trunc)
1316                 ceph_queue_vmtruncate(inode);
1317
1318         /* populate frag tree */
1319         if (S_ISDIR(inode->i_mode))
1320                 ceph_fill_fragtree(inode, &info->fragtree, dirinfo);
1321
1322         /* update delegation info? */
1323         if (dirinfo)
1324                 ceph_fill_dirfrag(inode, dirinfo);
1325
1326         err = 0;
1327 out:
1328         if (new_cap)
1329                 ceph_put_cap(mdsc, new_cap);
1330         ceph_buffer_put(old_blob);
1331         ceph_buffer_put(xattr_blob);
1332         ceph_put_string(pool_ns);
1333         return err;
1334 }
1335
1336 /*
1337  * caller should hold session s_mutex and dentry->d_lock.
1338  */
1339 static void __update_dentry_lease(struct inode *dir, struct dentry *dentry,
1340                                   struct ceph_mds_reply_lease *lease,
1341                                   struct ceph_mds_session *session,
1342                                   unsigned long from_time,
1343                                   struct ceph_mds_session **old_lease_session)
1344 {
1345         struct ceph_client *cl = ceph_inode_to_client(dir);
1346         struct ceph_dentry_info *di = ceph_dentry(dentry);
1347         unsigned mask = le16_to_cpu(lease->mask);
1348         long unsigned duration = le32_to_cpu(lease->duration_ms);
1349         long unsigned ttl = from_time + (duration * HZ) / 1000;
1350         long unsigned half_ttl = from_time + (duration * HZ / 2) / 1000;
1351
1352         doutc(cl, "%p duration %lu ms ttl %lu\n", dentry, duration, ttl);
1353
1354         /* only track leases on regular dentries */
1355         if (ceph_snap(dir) != CEPH_NOSNAP)
1356                 return;
1357
1358         if (mask & CEPH_LEASE_PRIMARY_LINK)
1359                 di->flags |= CEPH_DENTRY_PRIMARY_LINK;
1360         else
1361                 di->flags &= ~CEPH_DENTRY_PRIMARY_LINK;
1362
1363         di->lease_shared_gen = atomic_read(&ceph_inode(dir)->i_shared_gen);
1364         if (!(mask & CEPH_LEASE_VALID)) {
1365                 __ceph_dentry_dir_lease_touch(di);
1366                 return;
1367         }
1368
1369         if (di->lease_gen == atomic_read(&session->s_cap_gen) &&
1370             time_before(ttl, di->time))
1371                 return;  /* we already have a newer lease. */
1372
1373         if (di->lease_session && di->lease_session != session) {
1374                 *old_lease_session = di->lease_session;
1375                 di->lease_session = NULL;
1376         }
1377
1378         if (!di->lease_session)
1379                 di->lease_session = ceph_get_mds_session(session);
1380         di->lease_gen = atomic_read(&session->s_cap_gen);
1381         di->lease_seq = le32_to_cpu(lease->seq);
1382         di->lease_renew_after = half_ttl;
1383         di->lease_renew_from = 0;
1384         di->time = ttl;
1385
1386         __ceph_dentry_lease_touch(di);
1387 }
1388
1389 static inline void update_dentry_lease(struct inode *dir, struct dentry *dentry,
1390                                         struct ceph_mds_reply_lease *lease,
1391                                         struct ceph_mds_session *session,
1392                                         unsigned long from_time)
1393 {
1394         struct ceph_mds_session *old_lease_session = NULL;
1395         spin_lock(&dentry->d_lock);
1396         __update_dentry_lease(dir, dentry, lease, session, from_time,
1397                               &old_lease_session);
1398         spin_unlock(&dentry->d_lock);
1399         ceph_put_mds_session(old_lease_session);
1400 }
1401
1402 /*
1403  * update dentry lease without having parent inode locked
1404  */
1405 static void update_dentry_lease_careful(struct dentry *dentry,
1406                                         struct ceph_mds_reply_lease *lease,
1407                                         struct ceph_mds_session *session,
1408                                         unsigned long from_time,
1409                                         char *dname, u32 dname_len,
1410                                         struct ceph_vino *pdvino,
1411                                         struct ceph_vino *ptvino)
1412
1413 {
1414         struct inode *dir;
1415         struct ceph_mds_session *old_lease_session = NULL;
1416
1417         spin_lock(&dentry->d_lock);
1418         /* make sure dentry's name matches target */
1419         if (dentry->d_name.len != dname_len ||
1420             memcmp(dentry->d_name.name, dname, dname_len))
1421                 goto out_unlock;
1422
1423         dir = d_inode(dentry->d_parent);
1424         /* make sure parent matches dvino */
1425         if (!ceph_ino_compare(dir, pdvino))
1426                 goto out_unlock;
1427
1428         /* make sure dentry's inode matches target. NULL ptvino means that
1429          * we expect a negative dentry */
1430         if (ptvino) {
1431                 if (d_really_is_negative(dentry))
1432                         goto out_unlock;
1433                 if (!ceph_ino_compare(d_inode(dentry), ptvino))
1434                         goto out_unlock;
1435         } else {
1436                 if (d_really_is_positive(dentry))
1437                         goto out_unlock;
1438         }
1439
1440         __update_dentry_lease(dir, dentry, lease, session,
1441                               from_time, &old_lease_session);
1442 out_unlock:
1443         spin_unlock(&dentry->d_lock);
1444         ceph_put_mds_session(old_lease_session);
1445 }
1446
1447 /*
1448  * splice a dentry to an inode.
1449  * caller must hold directory i_rwsem for this to be safe.
1450  */
1451 static int splice_dentry(struct dentry **pdn, struct inode *in)
1452 {
1453         struct ceph_client *cl = ceph_inode_to_client(in);
1454         struct dentry *dn = *pdn;
1455         struct dentry *realdn;
1456
1457         BUG_ON(d_inode(dn));
1458
1459         if (S_ISDIR(in->i_mode)) {
1460                 /* If inode is directory, d_splice_alias() below will remove
1461                  * 'realdn' from its origin parent. We need to ensure that
1462                  * origin parent's readdir cache will not reference 'realdn'
1463                  */
1464                 realdn = d_find_any_alias(in);
1465                 if (realdn) {
1466                         struct ceph_dentry_info *di = ceph_dentry(realdn);
1467                         spin_lock(&realdn->d_lock);
1468
1469                         realdn->d_op->d_prune(realdn);
1470
1471                         di->time = jiffies;
1472                         di->lease_shared_gen = 0;
1473                         di->offset = 0;
1474
1475                         spin_unlock(&realdn->d_lock);
1476                         dput(realdn);
1477                 }
1478         }
1479
1480         /* dn must be unhashed */
1481         if (!d_unhashed(dn))
1482                 d_drop(dn);
1483         realdn = d_splice_alias(in, dn);
1484         if (IS_ERR(realdn)) {
1485                 pr_err_client(cl, "error %ld %p inode %p ino %llx.%llx\n",
1486                               PTR_ERR(realdn), dn, in, ceph_vinop(in));
1487                 return PTR_ERR(realdn);
1488         }
1489
1490         if (realdn) {
1491                 doutc(cl, "dn %p (%d) spliced with %p (%d) inode %p ino %llx.%llx\n",
1492                       dn, d_count(dn), realdn, d_count(realdn),
1493                       d_inode(realdn), ceph_vinop(d_inode(realdn)));
1494                 dput(dn);
1495                 *pdn = realdn;
1496         } else {
1497                 BUG_ON(!ceph_dentry(dn));
1498                 doutc(cl, "dn %p attached to %p ino %llx.%llx\n", dn,
1499                       d_inode(dn), ceph_vinop(d_inode(dn)));
1500         }
1501         return 0;
1502 }
1503
1504 /*
1505  * Incorporate results into the local cache.  This is either just
1506  * one inode, or a directory, dentry, and possibly linked-to inode (e.g.,
1507  * after a lookup).
1508  *
1509  * A reply may contain
1510  *         a directory inode along with a dentry.
1511  *  and/or a target inode
1512  *
1513  * Called with snap_rwsem (read).
1514  */
1515 int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req)
1516 {
1517         struct ceph_mds_session *session = req->r_session;
1518         struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1519         struct inode *in = NULL;
1520         struct ceph_vino tvino, dvino;
1521         struct ceph_fs_client *fsc = ceph_sb_to_fs_client(sb);
1522         struct ceph_client *cl = fsc->client;
1523         int err = 0;
1524
1525         doutc(cl, "%p is_dentry %d is_target %d\n", req,
1526               rinfo->head->is_dentry, rinfo->head->is_target);
1527
1528         if (!rinfo->head->is_target && !rinfo->head->is_dentry) {
1529                 doutc(cl, "reply is empty!\n");
1530                 if (rinfo->head->result == 0 && req->r_parent)
1531                         ceph_invalidate_dir_request(req);
1532                 return 0;
1533         }
1534
1535         if (rinfo->head->is_dentry) {
1536                 struct inode *dir = req->r_parent;
1537
1538                 if (dir) {
1539                         err = ceph_fill_inode(dir, NULL, &rinfo->diri,
1540                                               rinfo->dirfrag, session, -1,
1541                                               &req->r_caps_reservation);
1542                         if (err < 0)
1543                                 goto done;
1544                 } else {
1545                         WARN_ON_ONCE(1);
1546                 }
1547
1548                 if (dir && req->r_op == CEPH_MDS_OP_LOOKUPNAME &&
1549                     test_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags) &&
1550                     !test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
1551                         bool is_nokey = false;
1552                         struct qstr dname;
1553                         struct dentry *dn, *parent;
1554                         struct fscrypt_str oname = FSTR_INIT(NULL, 0);
1555                         struct ceph_fname fname = { .dir        = dir,
1556                                                     .name       = rinfo->dname,
1557                                                     .ctext      = rinfo->altname,
1558                                                     .name_len   = rinfo->dname_len,
1559                                                     .ctext_len  = rinfo->altname_len };
1560
1561                         BUG_ON(!rinfo->head->is_target);
1562                         BUG_ON(req->r_dentry);
1563
1564                         parent = d_find_any_alias(dir);
1565                         BUG_ON(!parent);
1566
1567                         err = ceph_fname_alloc_buffer(dir, &oname);
1568                         if (err < 0) {
1569                                 dput(parent);
1570                                 goto done;
1571                         }
1572
1573                         err = ceph_fname_to_usr(&fname, NULL, &oname, &is_nokey);
1574                         if (err < 0) {
1575                                 dput(parent);
1576                                 ceph_fname_free_buffer(dir, &oname);
1577                                 goto done;
1578                         }
1579                         dname.name = oname.name;
1580                         dname.len = oname.len;
1581                         dname.hash = full_name_hash(parent, dname.name, dname.len);
1582                         tvino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1583                         tvino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1584 retry_lookup:
1585                         dn = d_lookup(parent, &dname);
1586                         doutc(cl, "d_lookup on parent=%p name=%.*s got %p\n",
1587                               parent, dname.len, dname.name, dn);
1588
1589                         if (!dn) {
1590                                 dn = d_alloc(parent, &dname);
1591                                 doutc(cl, "d_alloc %p '%.*s' = %p\n", parent,
1592                                       dname.len, dname.name, dn);
1593                                 if (!dn) {
1594                                         dput(parent);
1595                                         ceph_fname_free_buffer(dir, &oname);
1596                                         err = -ENOMEM;
1597                                         goto done;
1598                                 }
1599                                 if (is_nokey) {
1600                                         spin_lock(&dn->d_lock);
1601                                         dn->d_flags |= DCACHE_NOKEY_NAME;
1602                                         spin_unlock(&dn->d_lock);
1603                                 }
1604                                 err = 0;
1605                         } else if (d_really_is_positive(dn) &&
1606                                    (ceph_ino(d_inode(dn)) != tvino.ino ||
1607                                     ceph_snap(d_inode(dn)) != tvino.snap)) {
1608                                 doutc(cl, " dn %p points to wrong inode %p\n",
1609                                       dn, d_inode(dn));
1610                                 ceph_dir_clear_ordered(dir);
1611                                 d_delete(dn);
1612                                 dput(dn);
1613                                 goto retry_lookup;
1614                         }
1615                         ceph_fname_free_buffer(dir, &oname);
1616
1617                         req->r_dentry = dn;
1618                         dput(parent);
1619                 }
1620         }
1621
1622         if (rinfo->head->is_target) {
1623                 /* Should be filled in by handle_reply */
1624                 BUG_ON(!req->r_target_inode);
1625
1626                 in = req->r_target_inode;
1627                 err = ceph_fill_inode(in, req->r_locked_page, &rinfo->targeti,
1628                                 NULL, session,
1629                                 (!test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags) &&
1630                                  !test_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags) &&
1631                                  rinfo->head->result == 0) ?  req->r_fmode : -1,
1632                                 &req->r_caps_reservation);
1633                 if (err < 0) {
1634                         pr_err_client(cl, "badness %p %llx.%llx\n", in,
1635                                       ceph_vinop(in));
1636                         req->r_target_inode = NULL;
1637                         if (in->i_state & I_NEW)
1638                                 discard_new_inode(in);
1639                         else
1640                                 iput(in);
1641                         goto done;
1642                 }
1643                 if (in->i_state & I_NEW)
1644                         unlock_new_inode(in);
1645         }
1646
1647         /*
1648          * ignore null lease/binding on snapdir ENOENT, or else we
1649          * will have trouble splicing in the virtual snapdir later
1650          */
1651         if (rinfo->head->is_dentry &&
1652             !test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags) &&
1653             test_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags) &&
1654             (rinfo->head->is_target || strncmp(req->r_dentry->d_name.name,
1655                                                fsc->mount_options->snapdir_name,
1656                                                req->r_dentry->d_name.len))) {
1657                 /*
1658                  * lookup link rename   : null -> possibly existing inode
1659                  * mknod symlink mkdir  : null -> new inode
1660                  * unlink               : linked -> null
1661                  */
1662                 struct inode *dir = req->r_parent;
1663                 struct dentry *dn = req->r_dentry;
1664                 bool have_dir_cap, have_lease;
1665
1666                 BUG_ON(!dn);
1667                 BUG_ON(!dir);
1668                 BUG_ON(d_inode(dn->d_parent) != dir);
1669
1670                 dvino.ino = le64_to_cpu(rinfo->diri.in->ino);
1671                 dvino.snap = le64_to_cpu(rinfo->diri.in->snapid);
1672
1673                 BUG_ON(ceph_ino(dir) != dvino.ino);
1674                 BUG_ON(ceph_snap(dir) != dvino.snap);
1675
1676                 /* do we have a lease on the whole dir? */
1677                 have_dir_cap =
1678                         (le32_to_cpu(rinfo->diri.in->cap.caps) &
1679                          CEPH_CAP_FILE_SHARED);
1680
1681                 /* do we have a dn lease? */
1682                 have_lease = have_dir_cap ||
1683                         le32_to_cpu(rinfo->dlease->duration_ms);
1684                 if (!have_lease)
1685                         doutc(cl, "no dentry lease or dir cap\n");
1686
1687                 /* rename? */
1688                 if (req->r_old_dentry && req->r_op == CEPH_MDS_OP_RENAME) {
1689                         struct inode *olddir = req->r_old_dentry_dir;
1690                         BUG_ON(!olddir);
1691
1692                         doutc(cl, " src %p '%pd' dst %p '%pd'\n",
1693                               req->r_old_dentry, req->r_old_dentry, dn, dn);
1694                         doutc(cl, "doing d_move %p -> %p\n", req->r_old_dentry, dn);
1695
1696                         /* d_move screws up sibling dentries' offsets */
1697                         ceph_dir_clear_ordered(dir);
1698                         ceph_dir_clear_ordered(olddir);
1699
1700                         d_move(req->r_old_dentry, dn);
1701                         doutc(cl, " src %p '%pd' dst %p '%pd'\n",
1702                               req->r_old_dentry, req->r_old_dentry, dn, dn);
1703
1704                         /* ensure target dentry is invalidated, despite
1705                            rehashing bug in vfs_rename_dir */
1706                         ceph_invalidate_dentry_lease(dn);
1707
1708                         doutc(cl, "dn %p gets new offset %lld\n",
1709                               req->r_old_dentry,
1710                               ceph_dentry(req->r_old_dentry)->offset);
1711
1712                         /* swap r_dentry and r_old_dentry in case that
1713                          * splice_dentry() gets called later. This is safe
1714                          * because no other place will use them */
1715                         req->r_dentry = req->r_old_dentry;
1716                         req->r_old_dentry = dn;
1717                         dn = req->r_dentry;
1718                 }
1719
1720                 /* null dentry? */
1721                 if (!rinfo->head->is_target) {
1722                         doutc(cl, "null dentry\n");
1723                         if (d_really_is_positive(dn)) {
1724                                 doutc(cl, "d_delete %p\n", dn);
1725                                 ceph_dir_clear_ordered(dir);
1726                                 d_delete(dn);
1727                         } else if (have_lease) {
1728                                 if (d_unhashed(dn))
1729                                         d_add(dn, NULL);
1730                         }
1731
1732                         if (!d_unhashed(dn) && have_lease)
1733                                 update_dentry_lease(dir, dn,
1734                                                     rinfo->dlease, session,
1735                                                     req->r_request_started);
1736                         goto done;
1737                 }
1738
1739                 /* attach proper inode */
1740                 if (d_really_is_negative(dn)) {
1741                         ceph_dir_clear_ordered(dir);
1742                         ihold(in);
1743                         err = splice_dentry(&req->r_dentry, in);
1744                         if (err < 0)
1745                                 goto done;
1746                         dn = req->r_dentry;  /* may have spliced */
1747                 } else if (d_really_is_positive(dn) && d_inode(dn) != in) {
1748                         doutc(cl, " %p links to %p %llx.%llx, not %llx.%llx\n",
1749                               dn, d_inode(dn), ceph_vinop(d_inode(dn)),
1750                               ceph_vinop(in));
1751                         d_invalidate(dn);
1752                         have_lease = false;
1753                 }
1754
1755                 if (have_lease) {
1756                         update_dentry_lease(dir, dn,
1757                                             rinfo->dlease, session,
1758                                             req->r_request_started);
1759                 }
1760                 doutc(cl, " final dn %p\n", dn);
1761         } else if ((req->r_op == CEPH_MDS_OP_LOOKUPSNAP ||
1762                     req->r_op == CEPH_MDS_OP_MKSNAP) &&
1763                    test_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags) &&
1764                    !test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
1765                 struct inode *dir = req->r_parent;
1766
1767                 /* fill out a snapdir LOOKUPSNAP dentry */
1768                 BUG_ON(!dir);
1769                 BUG_ON(ceph_snap(dir) != CEPH_SNAPDIR);
1770                 BUG_ON(!req->r_dentry);
1771                 doutc(cl, " linking snapped dir %p to dn %p\n", in,
1772                       req->r_dentry);
1773                 ceph_dir_clear_ordered(dir);
1774                 ihold(in);
1775                 err = splice_dentry(&req->r_dentry, in);
1776                 if (err < 0)
1777                         goto done;
1778         } else if (rinfo->head->is_dentry && req->r_dentry) {
1779                 /* parent inode is not locked, be carefull */
1780                 struct ceph_vino *ptvino = NULL;
1781                 dvino.ino = le64_to_cpu(rinfo->diri.in->ino);
1782                 dvino.snap = le64_to_cpu(rinfo->diri.in->snapid);
1783                 if (rinfo->head->is_target) {
1784                         tvino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1785                         tvino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1786                         ptvino = &tvino;
1787                 }
1788                 update_dentry_lease_careful(req->r_dentry, rinfo->dlease,
1789                                             session, req->r_request_started,
1790                                             rinfo->dname, rinfo->dname_len,
1791                                             &dvino, ptvino);
1792         }
1793 done:
1794         doutc(cl, "done err=%d\n", err);
1795         return err;
1796 }
1797
1798 /*
1799  * Prepopulate our cache with readdir results, leases, etc.
1800  */
1801 static int readdir_prepopulate_inodes_only(struct ceph_mds_request *req,
1802                                            struct ceph_mds_session *session)
1803 {
1804         struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1805         struct ceph_client *cl = session->s_mdsc->fsc->client;
1806         int i, err = 0;
1807
1808         for (i = 0; i < rinfo->dir_nr; i++) {
1809                 struct ceph_mds_reply_dir_entry *rde = rinfo->dir_entries + i;
1810                 struct ceph_vino vino;
1811                 struct inode *in;
1812                 int rc;
1813
1814                 vino.ino = le64_to_cpu(rde->inode.in->ino);
1815                 vino.snap = le64_to_cpu(rde->inode.in->snapid);
1816
1817                 in = ceph_get_inode(req->r_dentry->d_sb, vino, NULL);
1818                 if (IS_ERR(in)) {
1819                         err = PTR_ERR(in);
1820                         doutc(cl, "badness got %d\n", err);
1821                         continue;
1822                 }
1823                 rc = ceph_fill_inode(in, NULL, &rde->inode, NULL, session,
1824                                      -1, &req->r_caps_reservation);
1825                 if (rc < 0) {
1826                         pr_err_client(cl, "inode badness on %p got %d\n", in,
1827                                       rc);
1828                         err = rc;
1829                         if (in->i_state & I_NEW) {
1830                                 ihold(in);
1831                                 discard_new_inode(in);
1832                         }
1833                 } else if (in->i_state & I_NEW) {
1834                         unlock_new_inode(in);
1835                 }
1836
1837                 iput(in);
1838         }
1839
1840         return err;
1841 }
1842
1843 void ceph_readdir_cache_release(struct ceph_readdir_cache_control *ctl)
1844 {
1845         if (ctl->page) {
1846                 kunmap(ctl->page);
1847                 put_page(ctl->page);
1848                 ctl->page = NULL;
1849         }
1850 }
1851
1852 static int fill_readdir_cache(struct inode *dir, struct dentry *dn,
1853                               struct ceph_readdir_cache_control *ctl,
1854                               struct ceph_mds_request *req)
1855 {
1856         struct ceph_client *cl = ceph_inode_to_client(dir);
1857         struct ceph_inode_info *ci = ceph_inode(dir);
1858         unsigned nsize = PAGE_SIZE / sizeof(struct dentry*);
1859         unsigned idx = ctl->index % nsize;
1860         pgoff_t pgoff = ctl->index / nsize;
1861
1862         if (!ctl->page || pgoff != page_index(ctl->page)) {
1863                 ceph_readdir_cache_release(ctl);
1864                 if (idx == 0)
1865                         ctl->page = grab_cache_page(&dir->i_data, pgoff);
1866                 else
1867                         ctl->page = find_lock_page(&dir->i_data, pgoff);
1868                 if (!ctl->page) {
1869                         ctl->index = -1;
1870                         return idx == 0 ? -ENOMEM : 0;
1871                 }
1872                 /* reading/filling the cache are serialized by
1873                  * i_rwsem, no need to use page lock */
1874                 unlock_page(ctl->page);
1875                 ctl->dentries = kmap(ctl->page);
1876                 if (idx == 0)
1877                         memset(ctl->dentries, 0, PAGE_SIZE);
1878         }
1879
1880         if (req->r_dir_release_cnt == atomic64_read(&ci->i_release_count) &&
1881             req->r_dir_ordered_cnt == atomic64_read(&ci->i_ordered_count)) {
1882                 doutc(cl, "dn %p idx %d\n", dn, ctl->index);
1883                 ctl->dentries[idx] = dn;
1884                 ctl->index++;
1885         } else {
1886                 doutc(cl, "disable readdir cache\n");
1887                 ctl->index = -1;
1888         }
1889         return 0;
1890 }
1891
1892 int ceph_readdir_prepopulate(struct ceph_mds_request *req,
1893                              struct ceph_mds_session *session)
1894 {
1895         struct dentry *parent = req->r_dentry;
1896         struct inode *inode = d_inode(parent);
1897         struct ceph_inode_info *ci = ceph_inode(inode);
1898         struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1899         struct ceph_client *cl = session->s_mdsc->fsc->client;
1900         struct qstr dname;
1901         struct dentry *dn;
1902         struct inode *in;
1903         int err = 0, skipped = 0, ret, i;
1904         u32 frag = le32_to_cpu(req->r_args.readdir.frag);
1905         u32 last_hash = 0;
1906         u32 fpos_offset;
1907         struct ceph_readdir_cache_control cache_ctl = {};
1908
1909         if (test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags))
1910                 return readdir_prepopulate_inodes_only(req, session);
1911
1912         if (rinfo->hash_order) {
1913                 if (req->r_path2) {
1914                         last_hash = ceph_str_hash(ci->i_dir_layout.dl_dir_hash,
1915                                                   req->r_path2,
1916                                                   strlen(req->r_path2));
1917                         last_hash = ceph_frag_value(last_hash);
1918                 } else if (rinfo->offset_hash) {
1919                         /* mds understands offset_hash */
1920                         WARN_ON_ONCE(req->r_readdir_offset != 2);
1921                         last_hash = le32_to_cpu(req->r_args.readdir.offset_hash);
1922                 }
1923         }
1924
1925         if (rinfo->dir_dir &&
1926             le32_to_cpu(rinfo->dir_dir->frag) != frag) {
1927                 doutc(cl, "got new frag %x -> %x\n", frag,
1928                             le32_to_cpu(rinfo->dir_dir->frag));
1929                 frag = le32_to_cpu(rinfo->dir_dir->frag);
1930                 if (!rinfo->hash_order)
1931                         req->r_readdir_offset = 2;
1932         }
1933
1934         if (le32_to_cpu(rinfo->head->op) == CEPH_MDS_OP_LSSNAP) {
1935                 doutc(cl, "%d items under SNAPDIR dn %p\n",
1936                       rinfo->dir_nr, parent);
1937         } else {
1938                 doutc(cl, "%d items under dn %p\n", rinfo->dir_nr, parent);
1939                 if (rinfo->dir_dir)
1940                         ceph_fill_dirfrag(d_inode(parent), rinfo->dir_dir);
1941
1942                 if (ceph_frag_is_leftmost(frag) &&
1943                     req->r_readdir_offset == 2 &&
1944                     !(rinfo->hash_order && last_hash)) {
1945                         /* note dir version at start of readdir so we can
1946                          * tell if any dentries get dropped */
1947                         req->r_dir_release_cnt =
1948                                 atomic64_read(&ci->i_release_count);
1949                         req->r_dir_ordered_cnt =
1950                                 atomic64_read(&ci->i_ordered_count);
1951                         req->r_readdir_cache_idx = 0;
1952                 }
1953         }
1954
1955         cache_ctl.index = req->r_readdir_cache_idx;
1956         fpos_offset = req->r_readdir_offset;
1957
1958         /* FIXME: release caps/leases if error occurs */
1959         for (i = 0; i < rinfo->dir_nr; i++) {
1960                 struct ceph_mds_reply_dir_entry *rde = rinfo->dir_entries + i;
1961                 struct ceph_vino tvino;
1962
1963                 dname.name = rde->name;
1964                 dname.len = rde->name_len;
1965                 dname.hash = full_name_hash(parent, dname.name, dname.len);
1966
1967                 tvino.ino = le64_to_cpu(rde->inode.in->ino);
1968                 tvino.snap = le64_to_cpu(rde->inode.in->snapid);
1969
1970                 if (rinfo->hash_order) {
1971                         u32 hash = ceph_frag_value(rde->raw_hash);
1972                         if (hash != last_hash)
1973                                 fpos_offset = 2;
1974                         last_hash = hash;
1975                         rde->offset = ceph_make_fpos(hash, fpos_offset++, true);
1976                 } else {
1977                         rde->offset = ceph_make_fpos(frag, fpos_offset++, false);
1978                 }
1979
1980 retry_lookup:
1981                 dn = d_lookup(parent, &dname);
1982                 doutc(cl, "d_lookup on parent=%p name=%.*s got %p\n",
1983                       parent, dname.len, dname.name, dn);
1984
1985                 if (!dn) {
1986                         dn = d_alloc(parent, &dname);
1987                         doutc(cl, "d_alloc %p '%.*s' = %p\n", parent,
1988                               dname.len, dname.name, dn);
1989                         if (!dn) {
1990                                 doutc(cl, "d_alloc badness\n");
1991                                 err = -ENOMEM;
1992                                 goto out;
1993                         }
1994                         if (rde->is_nokey) {
1995                                 spin_lock(&dn->d_lock);
1996                                 dn->d_flags |= DCACHE_NOKEY_NAME;
1997                                 spin_unlock(&dn->d_lock);
1998                         }
1999                 } else if (d_really_is_positive(dn) &&
2000                            (ceph_ino(d_inode(dn)) != tvino.ino ||
2001                             ceph_snap(d_inode(dn)) != tvino.snap)) {
2002                         struct ceph_dentry_info *di = ceph_dentry(dn);
2003                         doutc(cl, " dn %p points to wrong inode %p\n",
2004                               dn, d_inode(dn));
2005
2006                         spin_lock(&dn->d_lock);
2007                         if (di->offset > 0 &&
2008                             di->lease_shared_gen ==
2009                             atomic_read(&ci->i_shared_gen)) {
2010                                 __ceph_dir_clear_ordered(ci);
2011                                 di->offset = 0;
2012                         }
2013                         spin_unlock(&dn->d_lock);
2014
2015                         d_delete(dn);
2016                         dput(dn);
2017                         goto retry_lookup;
2018                 }
2019
2020                 /* inode */
2021                 if (d_really_is_positive(dn)) {
2022                         in = d_inode(dn);
2023                 } else {
2024                         in = ceph_get_inode(parent->d_sb, tvino, NULL);
2025                         if (IS_ERR(in)) {
2026                                 doutc(cl, "new_inode badness\n");
2027                                 d_drop(dn);
2028                                 dput(dn);
2029                                 err = PTR_ERR(in);
2030                                 goto out;
2031                         }
2032                 }
2033
2034                 ret = ceph_fill_inode(in, NULL, &rde->inode, NULL, session,
2035                                       -1, &req->r_caps_reservation);
2036                 if (ret < 0) {
2037                         pr_err_client(cl, "badness on %p %llx.%llx\n", in,
2038                                       ceph_vinop(in));
2039                         if (d_really_is_negative(dn)) {
2040                                 if (in->i_state & I_NEW) {
2041                                         ihold(in);
2042                                         discard_new_inode(in);
2043                                 }
2044                                 iput(in);
2045                         }
2046                         d_drop(dn);
2047                         err = ret;
2048                         goto next_item;
2049                 }
2050                 if (in->i_state & I_NEW)
2051                         unlock_new_inode(in);
2052
2053                 if (d_really_is_negative(dn)) {
2054                         if (ceph_security_xattr_deadlock(in)) {
2055                                 doutc(cl, " skip splicing dn %p to inode %p"
2056                                       " (security xattr deadlock)\n", dn, in);
2057                                 iput(in);
2058                                 skipped++;
2059                                 goto next_item;
2060                         }
2061
2062                         err = splice_dentry(&dn, in);
2063                         if (err < 0)
2064                                 goto next_item;
2065                 }
2066
2067                 ceph_dentry(dn)->offset = rde->offset;
2068
2069                 update_dentry_lease(d_inode(parent), dn,
2070                                     rde->lease, req->r_session,
2071                                     req->r_request_started);
2072
2073                 if (err == 0 && skipped == 0 && cache_ctl.index >= 0) {
2074                         ret = fill_readdir_cache(d_inode(parent), dn,
2075                                                  &cache_ctl, req);
2076                         if (ret < 0)
2077                                 err = ret;
2078                 }
2079 next_item:
2080                 dput(dn);
2081         }
2082 out:
2083         if (err == 0 && skipped == 0) {
2084                 set_bit(CEPH_MDS_R_DID_PREPOPULATE, &req->r_req_flags);
2085                 req->r_readdir_cache_idx = cache_ctl.index;
2086         }
2087         ceph_readdir_cache_release(&cache_ctl);
2088         doutc(cl, "done\n");
2089         return err;
2090 }
2091
2092 bool ceph_inode_set_size(struct inode *inode, loff_t size)
2093 {
2094         struct ceph_client *cl = ceph_inode_to_client(inode);
2095         struct ceph_inode_info *ci = ceph_inode(inode);
2096         bool ret;
2097
2098         spin_lock(&ci->i_ceph_lock);
2099         doutc(cl, "set_size %p %llu -> %llu\n", inode, i_size_read(inode), size);
2100         i_size_write(inode, size);
2101         ceph_fscache_update(inode);
2102         inode->i_blocks = calc_inode_blocks(size);
2103
2104         ret = __ceph_should_report_size(ci);
2105
2106         spin_unlock(&ci->i_ceph_lock);
2107
2108         return ret;
2109 }
2110
2111 void ceph_queue_inode_work(struct inode *inode, int work_bit)
2112 {
2113         struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);
2114         struct ceph_client *cl = fsc->client;
2115         struct ceph_inode_info *ci = ceph_inode(inode);
2116         set_bit(work_bit, &ci->i_work_mask);
2117
2118         ihold(inode);
2119         if (queue_work(fsc->inode_wq, &ci->i_work)) {
2120                 doutc(cl, "%p %llx.%llx mask=%lx\n", inode,
2121                       ceph_vinop(inode), ci->i_work_mask);
2122         } else {
2123                 doutc(cl, "%p %llx.%llx already queued, mask=%lx\n",
2124                       inode, ceph_vinop(inode), ci->i_work_mask);
2125                 iput(inode);
2126         }
2127 }
2128
2129 static void ceph_do_invalidate_pages(struct inode *inode)
2130 {
2131         struct ceph_client *cl = ceph_inode_to_client(inode);
2132         struct ceph_inode_info *ci = ceph_inode(inode);
2133         u32 orig_gen;
2134         int check = 0;
2135
2136         ceph_fscache_invalidate(inode, false);
2137
2138         mutex_lock(&ci->i_truncate_mutex);
2139
2140         if (ceph_inode_is_shutdown(inode)) {
2141                 pr_warn_ratelimited_client(cl,
2142                         "%p %llx.%llx is shut down\n", inode,
2143                         ceph_vinop(inode));
2144                 mapping_set_error(inode->i_mapping, -EIO);
2145                 truncate_pagecache(inode, 0);
2146                 mutex_unlock(&ci->i_truncate_mutex);
2147                 goto out;
2148         }
2149
2150         spin_lock(&ci->i_ceph_lock);
2151         doutc(cl, "%p %llx.%llx gen %d revoking %d\n", inode,
2152               ceph_vinop(inode), ci->i_rdcache_gen, ci->i_rdcache_revoking);
2153         if (ci->i_rdcache_revoking != ci->i_rdcache_gen) {
2154                 if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE))
2155                         check = 1;
2156                 spin_unlock(&ci->i_ceph_lock);
2157                 mutex_unlock(&ci->i_truncate_mutex);
2158                 goto out;
2159         }
2160         orig_gen = ci->i_rdcache_gen;
2161         spin_unlock(&ci->i_ceph_lock);
2162
2163         if (invalidate_inode_pages2(inode->i_mapping) < 0) {
2164                 pr_err_client(cl, "invalidate_inode_pages2 %llx.%llx failed\n",
2165                               ceph_vinop(inode));
2166         }
2167
2168         spin_lock(&ci->i_ceph_lock);
2169         if (orig_gen == ci->i_rdcache_gen &&
2170             orig_gen == ci->i_rdcache_revoking) {
2171                 doutc(cl, "%p %llx.%llx gen %d successful\n", inode,
2172                       ceph_vinop(inode), ci->i_rdcache_gen);
2173                 ci->i_rdcache_revoking--;
2174                 check = 1;
2175         } else {
2176                 doutc(cl, "%p %llx.%llx gen %d raced, now %d revoking %d\n",
2177                       inode, ceph_vinop(inode), orig_gen, ci->i_rdcache_gen,
2178                       ci->i_rdcache_revoking);
2179                 if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE))
2180                         check = 1;
2181         }
2182         spin_unlock(&ci->i_ceph_lock);
2183         mutex_unlock(&ci->i_truncate_mutex);
2184 out:
2185         if (check)
2186                 ceph_check_caps(ci, 0);
2187 }
2188
2189 /*
2190  * Make sure any pending truncation is applied before doing anything
2191  * that may depend on it.
2192  */
2193 void __ceph_do_pending_vmtruncate(struct inode *inode)
2194 {
2195         struct ceph_client *cl = ceph_inode_to_client(inode);
2196         struct ceph_inode_info *ci = ceph_inode(inode);
2197         u64 to;
2198         int wrbuffer_refs, finish = 0;
2199
2200         mutex_lock(&ci->i_truncate_mutex);
2201 retry:
2202         spin_lock(&ci->i_ceph_lock);
2203         if (ci->i_truncate_pending == 0) {
2204                 doutc(cl, "%p %llx.%llx none pending\n", inode,
2205                       ceph_vinop(inode));
2206                 spin_unlock(&ci->i_ceph_lock);
2207                 mutex_unlock(&ci->i_truncate_mutex);
2208                 return;
2209         }
2210
2211         /*
2212          * make sure any dirty snapped pages are flushed before we
2213          * possibly truncate them.. so write AND block!
2214          */
2215         if (ci->i_wrbuffer_ref_head < ci->i_wrbuffer_ref) {
2216                 spin_unlock(&ci->i_ceph_lock);
2217                 doutc(cl, "%p %llx.%llx flushing snaps first\n", inode,
2218                       ceph_vinop(inode));
2219                 filemap_write_and_wait_range(&inode->i_data, 0,
2220                                              inode->i_sb->s_maxbytes);
2221                 goto retry;
2222         }
2223
2224         /* there should be no reader or writer */
2225         WARN_ON_ONCE(ci->i_rd_ref || ci->i_wr_ref);
2226
2227         to = ci->i_truncate_pagecache_size;
2228         wrbuffer_refs = ci->i_wrbuffer_ref;
2229         doutc(cl, "%p %llx.%llx (%d) to %lld\n", inode, ceph_vinop(inode),
2230               ci->i_truncate_pending, to);
2231         spin_unlock(&ci->i_ceph_lock);
2232
2233         ceph_fscache_resize(inode, to);
2234         truncate_pagecache(inode, to);
2235
2236         spin_lock(&ci->i_ceph_lock);
2237         if (to == ci->i_truncate_pagecache_size) {
2238                 ci->i_truncate_pending = 0;
2239                 finish = 1;
2240         }
2241         spin_unlock(&ci->i_ceph_lock);
2242         if (!finish)
2243                 goto retry;
2244
2245         mutex_unlock(&ci->i_truncate_mutex);
2246
2247         if (wrbuffer_refs == 0)
2248                 ceph_check_caps(ci, 0);
2249
2250         wake_up_all(&ci->i_cap_wq);
2251 }
2252
2253 static void ceph_inode_work(struct work_struct *work)
2254 {
2255         struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
2256                                                  i_work);
2257         struct inode *inode = &ci->netfs.inode;
2258         struct ceph_client *cl = ceph_inode_to_client(inode);
2259
2260         if (test_and_clear_bit(CEPH_I_WORK_WRITEBACK, &ci->i_work_mask)) {
2261                 doutc(cl, "writeback %p %llx.%llx\n", inode, ceph_vinop(inode));
2262                 filemap_fdatawrite(&inode->i_data);
2263         }
2264         if (test_and_clear_bit(CEPH_I_WORK_INVALIDATE_PAGES, &ci->i_work_mask))
2265                 ceph_do_invalidate_pages(inode);
2266
2267         if (test_and_clear_bit(CEPH_I_WORK_VMTRUNCATE, &ci->i_work_mask))
2268                 __ceph_do_pending_vmtruncate(inode);
2269
2270         if (test_and_clear_bit(CEPH_I_WORK_CHECK_CAPS, &ci->i_work_mask))
2271                 ceph_check_caps(ci, 0);
2272
2273         if (test_and_clear_bit(CEPH_I_WORK_FLUSH_SNAPS, &ci->i_work_mask))
2274                 ceph_flush_snaps(ci, NULL);
2275
2276         iput(inode);
2277 }
2278
2279 static const char *ceph_encrypted_get_link(struct dentry *dentry,
2280                                            struct inode *inode,
2281                                            struct delayed_call *done)
2282 {
2283         struct ceph_inode_info *ci = ceph_inode(inode);
2284
2285         if (!dentry)
2286                 return ERR_PTR(-ECHILD);
2287
2288         return fscrypt_get_symlink(inode, ci->i_symlink, i_size_read(inode),
2289                                    done);
2290 }
2291
2292 static int ceph_encrypted_symlink_getattr(struct mnt_idmap *idmap,
2293                                           const struct path *path,
2294                                           struct kstat *stat, u32 request_mask,
2295                                           unsigned int query_flags)
2296 {
2297         int ret;
2298
2299         ret = ceph_getattr(idmap, path, stat, request_mask, query_flags);
2300         if (ret)
2301                 return ret;
2302         return fscrypt_symlink_getattr(path, stat);
2303 }
2304
2305 /*
2306  * symlinks
2307  */
2308 static const struct inode_operations ceph_symlink_iops = {
2309         .get_link = simple_get_link,
2310         .setattr = ceph_setattr,
2311         .getattr = ceph_getattr,
2312         .listxattr = ceph_listxattr,
2313 };
2314
2315 static const struct inode_operations ceph_encrypted_symlink_iops = {
2316         .get_link = ceph_encrypted_get_link,
2317         .setattr = ceph_setattr,
2318         .getattr = ceph_encrypted_symlink_getattr,
2319         .listxattr = ceph_listxattr,
2320 };
2321
2322 /*
2323  * Transfer the encrypted last block to the MDS and the MDS
2324  * will help update it when truncating a smaller size.
2325  *
2326  * We don't support a PAGE_SIZE that is smaller than the
2327  * CEPH_FSCRYPT_BLOCK_SIZE.
2328  */
2329 static int fill_fscrypt_truncate(struct inode *inode,
2330                                  struct ceph_mds_request *req,
2331                                  struct iattr *attr)
2332 {
2333         struct ceph_client *cl = ceph_inode_to_client(inode);
2334         struct ceph_inode_info *ci = ceph_inode(inode);
2335         int boff = attr->ia_size % CEPH_FSCRYPT_BLOCK_SIZE;
2336         loff_t pos, orig_pos = round_down(attr->ia_size,
2337                                           CEPH_FSCRYPT_BLOCK_SIZE);
2338         u64 block = orig_pos >> CEPH_FSCRYPT_BLOCK_SHIFT;
2339         struct ceph_pagelist *pagelist = NULL;
2340         struct kvec iov = {0};
2341         struct iov_iter iter;
2342         struct page *page = NULL;
2343         struct ceph_fscrypt_truncate_size_header header;
2344         int retry_op = 0;
2345         int len = CEPH_FSCRYPT_BLOCK_SIZE;
2346         loff_t i_size = i_size_read(inode);
2347         int got, ret, issued;
2348         u64 objver;
2349
2350         ret = __ceph_get_caps(inode, NULL, CEPH_CAP_FILE_RD, 0, -1, &got);
2351         if (ret < 0)
2352                 return ret;
2353
2354         issued = __ceph_caps_issued(ci, NULL);
2355
2356         doutc(cl, "size %lld -> %lld got cap refs on %s, issued %s\n",
2357               i_size, attr->ia_size, ceph_cap_string(got),
2358               ceph_cap_string(issued));
2359
2360         /* Try to writeback the dirty pagecaches */
2361         if (issued & (CEPH_CAP_FILE_BUFFER)) {
2362                 loff_t lend = orig_pos + CEPH_FSCRYPT_BLOCK_SHIFT - 1;
2363
2364                 ret = filemap_write_and_wait_range(inode->i_mapping,
2365                                                    orig_pos, lend);
2366                 if (ret < 0)
2367                         goto out;
2368         }
2369
2370         page = __page_cache_alloc(GFP_KERNEL);
2371         if (page == NULL) {
2372                 ret = -ENOMEM;
2373                 goto out;
2374         }
2375
2376         pagelist = ceph_pagelist_alloc(GFP_KERNEL);
2377         if (!pagelist) {
2378                 ret = -ENOMEM;
2379                 goto out;
2380         }
2381
2382         iov.iov_base = kmap_local_page(page);
2383         iov.iov_len = len;
2384         iov_iter_kvec(&iter, READ, &iov, 1, len);
2385
2386         pos = orig_pos;
2387         ret = __ceph_sync_read(inode, &pos, &iter, &retry_op, &objver);
2388         if (ret < 0)
2389                 goto out;
2390
2391         /* Insert the header first */
2392         header.ver = 1;
2393         header.compat = 1;
2394         header.change_attr = cpu_to_le64(inode_peek_iversion_raw(inode));
2395
2396         /*
2397          * Always set the block_size to CEPH_FSCRYPT_BLOCK_SIZE,
2398          * because in MDS it may need this to do the truncate.
2399          */
2400         header.block_size = cpu_to_le32(CEPH_FSCRYPT_BLOCK_SIZE);
2401
2402         /*
2403          * If we hit a hole here, we should just skip filling
2404          * the fscrypt for the request, because once the fscrypt
2405          * is enabled, the file will be split into many blocks
2406          * with the size of CEPH_FSCRYPT_BLOCK_SIZE, if there
2407          * has a hole, the hole size should be multiple of block
2408          * size.
2409          *
2410          * If the Rados object doesn't exist, it will be set to 0.
2411          */
2412         if (!objver) {
2413                 doutc(cl, "hit hole, ppos %lld < size %lld\n", pos, i_size);
2414
2415                 header.data_len = cpu_to_le32(8 + 8 + 4);
2416                 header.file_offset = 0;
2417                 ret = 0;
2418         } else {
2419                 header.data_len = cpu_to_le32(8 + 8 + 4 + CEPH_FSCRYPT_BLOCK_SIZE);
2420                 header.file_offset = cpu_to_le64(orig_pos);
2421
2422                 doutc(cl, "encrypt block boff/bsize %d/%lu\n", boff,
2423                       CEPH_FSCRYPT_BLOCK_SIZE);
2424
2425                 /* truncate and zero out the extra contents for the last block */
2426                 memset(iov.iov_base + boff, 0, PAGE_SIZE - boff);
2427
2428                 /* encrypt the last block */
2429                 ret = ceph_fscrypt_encrypt_block_inplace(inode, page,
2430                                                     CEPH_FSCRYPT_BLOCK_SIZE,
2431                                                     0, block,
2432                                                     GFP_KERNEL);
2433                 if (ret)
2434                         goto out;
2435         }
2436
2437         /* Insert the header */
2438         ret = ceph_pagelist_append(pagelist, &header, sizeof(header));
2439         if (ret)
2440                 goto out;
2441
2442         if (header.block_size) {
2443                 /* Append the last block contents to pagelist */
2444                 ret = ceph_pagelist_append(pagelist, iov.iov_base,
2445                                            CEPH_FSCRYPT_BLOCK_SIZE);
2446                 if (ret)
2447                         goto out;
2448         }
2449         req->r_pagelist = pagelist;
2450 out:
2451         doutc(cl, "%p %llx.%llx size dropping cap refs on %s\n", inode,
2452               ceph_vinop(inode), ceph_cap_string(got));
2453         ceph_put_cap_refs(ci, got);
2454         if (iov.iov_base)
2455                 kunmap_local(iov.iov_base);
2456         if (page)
2457                 __free_pages(page, 0);
2458         if (ret && pagelist)
2459                 ceph_pagelist_release(pagelist);
2460         return ret;
2461 }
2462
2463 int __ceph_setattr(struct mnt_idmap *idmap, struct inode *inode,
2464                    struct iattr *attr, struct ceph_iattr *cia)
2465 {
2466         struct ceph_inode_info *ci = ceph_inode(inode);
2467         unsigned int ia_valid = attr->ia_valid;
2468         struct ceph_mds_request *req;
2469         struct ceph_mds_client *mdsc = ceph_sb_to_fs_client(inode->i_sb)->mdsc;
2470         struct ceph_client *cl = ceph_inode_to_client(inode);
2471         struct ceph_cap_flush *prealloc_cf;
2472         loff_t isize = i_size_read(inode);
2473         int issued;
2474         int release = 0, dirtied = 0;
2475         int mask = 0;
2476         int err = 0;
2477         int inode_dirty_flags = 0;
2478         bool lock_snap_rwsem = false;
2479         bool fill_fscrypt;
2480         int truncate_retry = 20; /* The RMW will take around 50ms */
2481
2482 retry:
2483         prealloc_cf = ceph_alloc_cap_flush();
2484         if (!prealloc_cf)
2485                 return -ENOMEM;
2486
2487         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETATTR,
2488                                        USE_AUTH_MDS);
2489         if (IS_ERR(req)) {
2490                 ceph_free_cap_flush(prealloc_cf);
2491                 return PTR_ERR(req);
2492         }
2493
2494         fill_fscrypt = false;
2495         spin_lock(&ci->i_ceph_lock);
2496         issued = __ceph_caps_issued(ci, NULL);
2497
2498         if (!ci->i_head_snapc &&
2499             (issued & (CEPH_CAP_ANY_EXCL | CEPH_CAP_FILE_WR))) {
2500                 lock_snap_rwsem = true;
2501                 if (!down_read_trylock(&mdsc->snap_rwsem)) {
2502                         spin_unlock(&ci->i_ceph_lock);
2503                         down_read(&mdsc->snap_rwsem);
2504                         spin_lock(&ci->i_ceph_lock);
2505                         issued = __ceph_caps_issued(ci, NULL);
2506                 }
2507         }
2508
2509         doutc(cl, "%p %llx.%llx issued %s\n", inode, ceph_vinop(inode),
2510               ceph_cap_string(issued));
2511 #if IS_ENABLED(CONFIG_FS_ENCRYPTION)
2512         if (cia && cia->fscrypt_auth) {
2513                 u32 len = ceph_fscrypt_auth_len(cia->fscrypt_auth);
2514
2515                 if (len > sizeof(*cia->fscrypt_auth)) {
2516                         err = -EINVAL;
2517                         spin_unlock(&ci->i_ceph_lock);
2518                         goto out;
2519                 }
2520
2521                 doutc(cl, "%p %llx.%llx fscrypt_auth len %u to %u)\n", inode,
2522                       ceph_vinop(inode), ci->fscrypt_auth_len, len);
2523
2524                 /* It should never be re-set once set */
2525                 WARN_ON_ONCE(ci->fscrypt_auth);
2526
2527                 if (issued & CEPH_CAP_AUTH_EXCL) {
2528                         dirtied |= CEPH_CAP_AUTH_EXCL;
2529                         kfree(ci->fscrypt_auth);
2530                         ci->fscrypt_auth = (u8 *)cia->fscrypt_auth;
2531                         ci->fscrypt_auth_len = len;
2532                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
2533                            ci->fscrypt_auth_len != len ||
2534                            memcmp(ci->fscrypt_auth, cia->fscrypt_auth, len)) {
2535                         req->r_fscrypt_auth = cia->fscrypt_auth;
2536                         mask |= CEPH_SETATTR_FSCRYPT_AUTH;
2537                         release |= CEPH_CAP_AUTH_SHARED;
2538                 }
2539                 cia->fscrypt_auth = NULL;
2540         }
2541 #else
2542         if (cia && cia->fscrypt_auth) {
2543                 err = -EINVAL;
2544                 spin_unlock(&ci->i_ceph_lock);
2545                 goto out;
2546         }
2547 #endif /* CONFIG_FS_ENCRYPTION */
2548
2549         if (ia_valid & ATTR_UID) {
2550                 kuid_t fsuid = from_vfsuid(idmap, i_user_ns(inode), attr->ia_vfsuid);
2551
2552                 doutc(cl, "%p %llx.%llx uid %d -> %d\n", inode,
2553                       ceph_vinop(inode),
2554                       from_kuid(&init_user_ns, inode->i_uid),
2555                       from_kuid(&init_user_ns, attr->ia_uid));
2556                 if (issued & CEPH_CAP_AUTH_EXCL) {
2557                         inode->i_uid = fsuid;
2558                         dirtied |= CEPH_CAP_AUTH_EXCL;
2559                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
2560                            !uid_eq(fsuid, inode->i_uid)) {
2561                         req->r_args.setattr.uid = cpu_to_le32(
2562                                 from_kuid(&init_user_ns, fsuid));
2563                         mask |= CEPH_SETATTR_UID;
2564                         release |= CEPH_CAP_AUTH_SHARED;
2565                 }
2566         }
2567         if (ia_valid & ATTR_GID) {
2568                 kgid_t fsgid = from_vfsgid(idmap, i_user_ns(inode), attr->ia_vfsgid);
2569
2570                 doutc(cl, "%p %llx.%llx gid %d -> %d\n", inode,
2571                       ceph_vinop(inode),
2572                       from_kgid(&init_user_ns, inode->i_gid),
2573                       from_kgid(&init_user_ns, attr->ia_gid));
2574                 if (issued & CEPH_CAP_AUTH_EXCL) {
2575                         inode->i_gid = fsgid;
2576                         dirtied |= CEPH_CAP_AUTH_EXCL;
2577                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
2578                            !gid_eq(fsgid, inode->i_gid)) {
2579                         req->r_args.setattr.gid = cpu_to_le32(
2580                                 from_kgid(&init_user_ns, fsgid));
2581                         mask |= CEPH_SETATTR_GID;
2582                         release |= CEPH_CAP_AUTH_SHARED;
2583                 }
2584         }
2585         if (ia_valid & ATTR_MODE) {
2586                 doutc(cl, "%p %llx.%llx mode 0%o -> 0%o\n", inode,
2587                       ceph_vinop(inode), inode->i_mode, attr->ia_mode);
2588                 if (issued & CEPH_CAP_AUTH_EXCL) {
2589                         inode->i_mode = attr->ia_mode;
2590                         dirtied |= CEPH_CAP_AUTH_EXCL;
2591                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
2592                            attr->ia_mode != inode->i_mode) {
2593                         inode->i_mode = attr->ia_mode;
2594                         req->r_args.setattr.mode = cpu_to_le32(attr->ia_mode);
2595                         mask |= CEPH_SETATTR_MODE;
2596                         release |= CEPH_CAP_AUTH_SHARED;
2597                 }
2598         }
2599
2600         if (ia_valid & ATTR_ATIME) {
2601                 struct timespec64 atime = inode_get_atime(inode);
2602
2603                 doutc(cl, "%p %llx.%llx atime %lld.%09ld -> %lld.%09ld\n",
2604                       inode, ceph_vinop(inode),
2605                       atime.tv_sec, atime.tv_nsec,
2606                       attr->ia_atime.tv_sec, attr->ia_atime.tv_nsec);
2607                 if (issued & CEPH_CAP_FILE_EXCL) {
2608                         ci->i_time_warp_seq++;
2609                         inode_set_atime_to_ts(inode, attr->ia_atime);
2610                         dirtied |= CEPH_CAP_FILE_EXCL;
2611                 } else if ((issued & CEPH_CAP_FILE_WR) &&
2612                            timespec64_compare(&atime,
2613                                               &attr->ia_atime) < 0) {
2614                         inode_set_atime_to_ts(inode, attr->ia_atime);
2615                         dirtied |= CEPH_CAP_FILE_WR;
2616                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
2617                            !timespec64_equal(&atime, &attr->ia_atime)) {
2618                         ceph_encode_timespec64(&req->r_args.setattr.atime,
2619                                                &attr->ia_atime);
2620                         mask |= CEPH_SETATTR_ATIME;
2621                         release |= CEPH_CAP_FILE_SHARED |
2622                                    CEPH_CAP_FILE_RD | CEPH_CAP_FILE_WR;
2623                 }
2624         }
2625         if (ia_valid & ATTR_SIZE) {
2626                 doutc(cl, "%p %llx.%llx size %lld -> %lld\n", inode,
2627                       ceph_vinop(inode), isize, attr->ia_size);
2628                 /*
2629                  * Only when the new size is smaller and not aligned to
2630                  * CEPH_FSCRYPT_BLOCK_SIZE will the RMW is needed.
2631                  */
2632                 if (IS_ENCRYPTED(inode) && attr->ia_size < isize &&
2633                     (attr->ia_size % CEPH_FSCRYPT_BLOCK_SIZE)) {
2634                         mask |= CEPH_SETATTR_SIZE;
2635                         release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_EXCL |
2636                                    CEPH_CAP_FILE_RD | CEPH_CAP_FILE_WR;
2637                         set_bit(CEPH_MDS_R_FSCRYPT_FILE, &req->r_req_flags);
2638                         mask |= CEPH_SETATTR_FSCRYPT_FILE;
2639                         req->r_args.setattr.size =
2640                                 cpu_to_le64(round_up(attr->ia_size,
2641                                                      CEPH_FSCRYPT_BLOCK_SIZE));
2642                         req->r_args.setattr.old_size =
2643                                 cpu_to_le64(round_up(isize,
2644                                                      CEPH_FSCRYPT_BLOCK_SIZE));
2645                         req->r_fscrypt_file = attr->ia_size;
2646                         fill_fscrypt = true;
2647                 } else if ((issued & CEPH_CAP_FILE_EXCL) && attr->ia_size >= isize) {
2648                         if (attr->ia_size > isize) {
2649                                 i_size_write(inode, attr->ia_size);
2650                                 inode->i_blocks = calc_inode_blocks(attr->ia_size);
2651                                 ci->i_reported_size = attr->ia_size;
2652                                 dirtied |= CEPH_CAP_FILE_EXCL;
2653                                 ia_valid |= ATTR_MTIME;
2654                         }
2655                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
2656                            attr->ia_size != isize) {
2657                         mask |= CEPH_SETATTR_SIZE;
2658                         release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_EXCL |
2659                                    CEPH_CAP_FILE_RD | CEPH_CAP_FILE_WR;
2660                         if (IS_ENCRYPTED(inode) && attr->ia_size) {
2661                                 set_bit(CEPH_MDS_R_FSCRYPT_FILE, &req->r_req_flags);
2662                                 mask |= CEPH_SETATTR_FSCRYPT_FILE;
2663                                 req->r_args.setattr.size =
2664                                         cpu_to_le64(round_up(attr->ia_size,
2665                                                              CEPH_FSCRYPT_BLOCK_SIZE));
2666                                 req->r_args.setattr.old_size =
2667                                         cpu_to_le64(round_up(isize,
2668                                                              CEPH_FSCRYPT_BLOCK_SIZE));
2669                                 req->r_fscrypt_file = attr->ia_size;
2670                         } else {
2671                                 req->r_args.setattr.size = cpu_to_le64(attr->ia_size);
2672                                 req->r_args.setattr.old_size = cpu_to_le64(isize);
2673                                 req->r_fscrypt_file = 0;
2674                         }
2675                 }
2676         }
2677         if (ia_valid & ATTR_MTIME) {
2678                 struct timespec64 mtime = inode_get_mtime(inode);
2679
2680                 doutc(cl, "%p %llx.%llx mtime %lld.%09ld -> %lld.%09ld\n",
2681                       inode, ceph_vinop(inode),
2682                       mtime.tv_sec, mtime.tv_nsec,
2683                       attr->ia_mtime.tv_sec, attr->ia_mtime.tv_nsec);
2684                 if (issued & CEPH_CAP_FILE_EXCL) {
2685                         ci->i_time_warp_seq++;
2686                         inode_set_mtime_to_ts(inode, attr->ia_mtime);
2687                         dirtied |= CEPH_CAP_FILE_EXCL;
2688                 } else if ((issued & CEPH_CAP_FILE_WR) &&
2689                            timespec64_compare(&mtime, &attr->ia_mtime) < 0) {
2690                         inode_set_mtime_to_ts(inode, attr->ia_mtime);
2691                         dirtied |= CEPH_CAP_FILE_WR;
2692                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
2693                            !timespec64_equal(&mtime, &attr->ia_mtime)) {
2694                         ceph_encode_timespec64(&req->r_args.setattr.mtime,
2695                                                &attr->ia_mtime);
2696                         mask |= CEPH_SETATTR_MTIME;
2697                         release |= CEPH_CAP_FILE_SHARED |
2698                                    CEPH_CAP_FILE_RD | CEPH_CAP_FILE_WR;
2699                 }
2700         }
2701
2702         /* these do nothing */
2703         if (ia_valid & ATTR_CTIME) {
2704                 bool only = (ia_valid & (ATTR_SIZE|ATTR_MTIME|ATTR_ATIME|
2705                                          ATTR_MODE|ATTR_UID|ATTR_GID)) == 0;
2706                 doutc(cl, "%p %llx.%llx ctime %lld.%09ld -> %lld.%09ld (%s)\n",
2707                       inode, ceph_vinop(inode),
2708                       inode_get_ctime_sec(inode),
2709                       inode_get_ctime_nsec(inode),
2710                       attr->ia_ctime.tv_sec, attr->ia_ctime.tv_nsec,
2711                       only ? "ctime only" : "ignored");
2712                 if (only) {
2713                         /*
2714                          * if kernel wants to dirty ctime but nothing else,
2715                          * we need to choose a cap to dirty under, or do
2716                          * a almost-no-op setattr
2717                          */
2718                         if (issued & CEPH_CAP_AUTH_EXCL)
2719                                 dirtied |= CEPH_CAP_AUTH_EXCL;
2720                         else if (issued & CEPH_CAP_FILE_EXCL)
2721                                 dirtied |= CEPH_CAP_FILE_EXCL;
2722                         else if (issued & CEPH_CAP_XATTR_EXCL)
2723                                 dirtied |= CEPH_CAP_XATTR_EXCL;
2724                         else
2725                                 mask |= CEPH_SETATTR_CTIME;
2726                 }
2727         }
2728         if (ia_valid & ATTR_FILE)
2729                 doutc(cl, "%p %llx.%llx ATTR_FILE ... hrm!\n", inode,
2730                       ceph_vinop(inode));
2731
2732         if (dirtied) {
2733                 inode_dirty_flags = __ceph_mark_dirty_caps(ci, dirtied,
2734                                                            &prealloc_cf);
2735                 inode_set_ctime_to_ts(inode, attr->ia_ctime);
2736                 inode_inc_iversion_raw(inode);
2737         }
2738
2739         release &= issued;
2740         spin_unlock(&ci->i_ceph_lock);
2741         if (lock_snap_rwsem) {
2742                 up_read(&mdsc->snap_rwsem);
2743                 lock_snap_rwsem = false;
2744         }
2745
2746         if (inode_dirty_flags)
2747                 __mark_inode_dirty(inode, inode_dirty_flags);
2748
2749         if (mask) {
2750                 req->r_inode = inode;
2751                 ihold(inode);
2752                 req->r_inode_drop = release;
2753                 req->r_args.setattr.mask = cpu_to_le32(mask);
2754                 req->r_num_caps = 1;
2755                 req->r_stamp = attr->ia_ctime;
2756                 if (fill_fscrypt) {
2757                         err = fill_fscrypt_truncate(inode, req, attr);
2758                         if (err)
2759                                 goto out;
2760                 }
2761
2762                 /*
2763                  * The truncate request will return -EAGAIN when the
2764                  * last block has been updated just before the MDS
2765                  * successfully gets the xlock for the FILE lock. To
2766                  * avoid corrupting the file contents we need to retry
2767                  * it.
2768                  */
2769                 err = ceph_mdsc_do_request(mdsc, NULL, req);
2770                 if (err == -EAGAIN && truncate_retry--) {
2771                         doutc(cl, "%p %llx.%llx result=%d (%s locally, %d remote), retry it!\n",
2772                               inode, ceph_vinop(inode), err,
2773                               ceph_cap_string(dirtied), mask);
2774                         ceph_mdsc_put_request(req);
2775                         ceph_free_cap_flush(prealloc_cf);
2776                         goto retry;
2777                 }
2778         }
2779 out:
2780         doutc(cl, "%p %llx.%llx result=%d (%s locally, %d remote)\n", inode,
2781               ceph_vinop(inode), err, ceph_cap_string(dirtied), mask);
2782
2783         ceph_mdsc_put_request(req);
2784         ceph_free_cap_flush(prealloc_cf);
2785
2786         if (err >= 0 && (mask & CEPH_SETATTR_SIZE))
2787                 __ceph_do_pending_vmtruncate(inode);
2788
2789         return err;
2790 }
2791
2792 /*
2793  * setattr
2794  */
2795 int ceph_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
2796                  struct iattr *attr)
2797 {
2798         struct inode *inode = d_inode(dentry);
2799         struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);
2800         int err;
2801
2802         if (ceph_snap(inode) != CEPH_NOSNAP)
2803                 return -EROFS;
2804
2805         if (ceph_inode_is_shutdown(inode))
2806                 return -ESTALE;
2807
2808         err = fscrypt_prepare_setattr(dentry, attr);
2809         if (err)
2810                 return err;
2811
2812         err = setattr_prepare(idmap, dentry, attr);
2813         if (err != 0)
2814                 return err;
2815
2816         if ((attr->ia_valid & ATTR_SIZE) &&
2817             attr->ia_size > max(i_size_read(inode), fsc->max_file_size))
2818                 return -EFBIG;
2819
2820         if ((attr->ia_valid & ATTR_SIZE) &&
2821             ceph_quota_is_max_bytes_exceeded(inode, attr->ia_size))
2822                 return -EDQUOT;
2823
2824         err = __ceph_setattr(idmap, inode, attr, NULL);
2825
2826         if (err >= 0 && (attr->ia_valid & ATTR_MODE))
2827                 err = posix_acl_chmod(idmap, dentry, attr->ia_mode);
2828
2829         return err;
2830 }
2831
2832 int ceph_try_to_choose_auth_mds(struct inode *inode, int mask)
2833 {
2834         int issued = ceph_caps_issued(ceph_inode(inode));
2835
2836         /*
2837          * If any 'x' caps is issued we can just choose the auth MDS
2838          * instead of the random replica MDSes. Because only when the
2839          * Locker is in LOCK_EXEC state will the loner client could
2840          * get the 'x' caps. And if we send the getattr requests to
2841          * any replica MDS it must auth pin and tries to rdlock from
2842          * the auth MDS, and then the auth MDS need to do the Locker
2843          * state transition to LOCK_SYNC. And after that the lock state
2844          * will change back.
2845          *
2846          * This cost much when doing the Locker state transition and
2847          * usually will need to revoke caps from clients.
2848          *
2849          * And for the 'Xs' caps for getxattr we will also choose the
2850          * auth MDS, because the MDS side code is buggy due to setxattr
2851          * won't notify the replica MDSes when the values changed and
2852          * the replica MDS will return the old values. Though we will
2853          * fix it in MDS code, but this still makes sense for old ceph.
2854          */
2855         if (((mask & CEPH_CAP_ANY_SHARED) && (issued & CEPH_CAP_ANY_EXCL))
2856             || (mask & (CEPH_STAT_RSTAT | CEPH_STAT_CAP_XATTR)))
2857                 return USE_AUTH_MDS;
2858         else
2859                 return USE_ANY_MDS;
2860 }
2861
2862 /*
2863  * Verify that we have a lease on the given mask.  If not,
2864  * do a getattr against an mds.
2865  */
2866 int __ceph_do_getattr(struct inode *inode, struct page *locked_page,
2867                       int mask, bool force)
2868 {
2869         struct ceph_fs_client *fsc = ceph_sb_to_fs_client(inode->i_sb);
2870         struct ceph_client *cl = fsc->client;
2871         struct ceph_mds_client *mdsc = fsc->mdsc;
2872         struct ceph_mds_request *req;
2873         int mode;
2874         int err;
2875
2876         if (ceph_snap(inode) == CEPH_SNAPDIR) {
2877                 doutc(cl, "inode %p %llx.%llx SNAPDIR\n", inode,
2878                       ceph_vinop(inode));
2879                 return 0;
2880         }
2881
2882         doutc(cl, "inode %p %llx.%llx mask %s mode 0%o\n", inode,
2883               ceph_vinop(inode), ceph_cap_string(mask), inode->i_mode);
2884         if (!force && ceph_caps_issued_mask_metric(ceph_inode(inode), mask, 1))
2885                         return 0;
2886
2887         mode = ceph_try_to_choose_auth_mds(inode, mask);
2888         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, mode);
2889         if (IS_ERR(req))
2890                 return PTR_ERR(req);
2891         req->r_inode = inode;
2892         ihold(inode);
2893         req->r_num_caps = 1;
2894         req->r_args.getattr.mask = cpu_to_le32(mask);
2895         req->r_locked_page = locked_page;
2896         err = ceph_mdsc_do_request(mdsc, NULL, req);
2897         if (locked_page && err == 0) {
2898                 u64 inline_version = req->r_reply_info.targeti.inline_version;
2899                 if (inline_version == 0) {
2900                         /* the reply is supposed to contain inline data */
2901                         err = -EINVAL;
2902                 } else if (inline_version == CEPH_INLINE_NONE ||
2903                            inline_version == 1) {
2904                         err = -ENODATA;
2905                 } else {
2906                         err = req->r_reply_info.targeti.inline_len;
2907                 }
2908         }
2909         ceph_mdsc_put_request(req);
2910         doutc(cl, "result=%d\n", err);
2911         return err;
2912 }
2913
2914 int ceph_do_getvxattr(struct inode *inode, const char *name, void *value,
2915                       size_t size)
2916 {
2917         struct ceph_fs_client *fsc = ceph_sb_to_fs_client(inode->i_sb);
2918         struct ceph_client *cl = fsc->client;
2919         struct ceph_mds_client *mdsc = fsc->mdsc;
2920         struct ceph_mds_request *req;
2921         int mode = USE_AUTH_MDS;
2922         int err;
2923         char *xattr_value;
2924         size_t xattr_value_len;
2925
2926         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETVXATTR, mode);
2927         if (IS_ERR(req)) {
2928                 err = -ENOMEM;
2929                 goto out;
2930         }
2931
2932         req->r_feature_needed = CEPHFS_FEATURE_OP_GETVXATTR;
2933         req->r_path2 = kstrdup(name, GFP_NOFS);
2934         if (!req->r_path2) {
2935                 err = -ENOMEM;
2936                 goto put;
2937         }
2938
2939         ihold(inode);
2940         req->r_inode = inode;
2941         err = ceph_mdsc_do_request(mdsc, NULL, req);
2942         if (err < 0)
2943                 goto put;
2944
2945         xattr_value = req->r_reply_info.xattr_info.xattr_value;
2946         xattr_value_len = req->r_reply_info.xattr_info.xattr_value_len;
2947
2948         doutc(cl, "xattr_value_len:%zu, size:%zu\n", xattr_value_len, size);
2949
2950         err = (int)xattr_value_len;
2951         if (size == 0)
2952                 goto put;
2953
2954         if (xattr_value_len > size) {
2955                 err = -ERANGE;
2956                 goto put;
2957         }
2958
2959         memcpy(value, xattr_value, xattr_value_len);
2960 put:
2961         ceph_mdsc_put_request(req);
2962 out:
2963         doutc(cl, "result=%d\n", err);
2964         return err;
2965 }
2966
2967
2968 /*
2969  * Check inode permissions.  We verify we have a valid value for
2970  * the AUTH cap, then call the generic handler.
2971  */
2972 int ceph_permission(struct mnt_idmap *idmap, struct inode *inode,
2973                     int mask)
2974 {
2975         int err;
2976
2977         if (mask & MAY_NOT_BLOCK)
2978                 return -ECHILD;
2979
2980         err = ceph_do_getattr(inode, CEPH_CAP_AUTH_SHARED, false);
2981
2982         if (!err)
2983                 err = generic_permission(idmap, inode, mask);
2984         return err;
2985 }
2986
2987 /* Craft a mask of needed caps given a set of requested statx attrs. */
2988 static int statx_to_caps(u32 want, umode_t mode)
2989 {
2990         int mask = 0;
2991
2992         if (want & (STATX_MODE|STATX_UID|STATX_GID|STATX_CTIME|STATX_BTIME|STATX_CHANGE_COOKIE))
2993                 mask |= CEPH_CAP_AUTH_SHARED;
2994
2995         if (want & (STATX_NLINK|STATX_CTIME|STATX_CHANGE_COOKIE)) {
2996                 /*
2997                  * The link count for directories depends on inode->i_subdirs,
2998                  * and that is only updated when Fs caps are held.
2999                  */
3000                 if (S_ISDIR(mode))
3001                         mask |= CEPH_CAP_FILE_SHARED;
3002                 else
3003                         mask |= CEPH_CAP_LINK_SHARED;
3004         }
3005
3006         if (want & (STATX_ATIME|STATX_MTIME|STATX_CTIME|STATX_SIZE|STATX_BLOCKS|STATX_CHANGE_COOKIE))
3007                 mask |= CEPH_CAP_FILE_SHARED;
3008
3009         if (want & (STATX_CTIME|STATX_CHANGE_COOKIE))
3010                 mask |= CEPH_CAP_XATTR_SHARED;
3011
3012         return mask;
3013 }
3014
3015 /*
3016  * Get all the attributes. If we have sufficient caps for the requested attrs,
3017  * then we can avoid talking to the MDS at all.
3018  */
3019 int ceph_getattr(struct mnt_idmap *idmap, const struct path *path,
3020                  struct kstat *stat, u32 request_mask, unsigned int flags)
3021 {
3022         struct inode *inode = d_inode(path->dentry);
3023         struct super_block *sb = inode->i_sb;
3024         struct ceph_inode_info *ci = ceph_inode(inode);
3025         u32 valid_mask = STATX_BASIC_STATS;
3026         int err = 0;
3027
3028         if (ceph_inode_is_shutdown(inode))
3029                 return -ESTALE;
3030
3031         /* Skip the getattr altogether if we're asked not to sync */
3032         if ((flags & AT_STATX_SYNC_TYPE) != AT_STATX_DONT_SYNC) {
3033                 err = ceph_do_getattr(inode,
3034                                 statx_to_caps(request_mask, inode->i_mode),
3035                                 flags & AT_STATX_FORCE_SYNC);
3036                 if (err)
3037                         return err;
3038         }
3039
3040         generic_fillattr(idmap, request_mask, inode, stat);
3041         stat->ino = ceph_present_inode(inode);
3042
3043         /*
3044          * btime on newly-allocated inodes is 0, so if this is still set to
3045          * that, then assume that it's not valid.
3046          */
3047         if (ci->i_btime.tv_sec || ci->i_btime.tv_nsec) {
3048                 stat->btime = ci->i_btime;
3049                 valid_mask |= STATX_BTIME;
3050         }
3051
3052         if (request_mask & STATX_CHANGE_COOKIE) {
3053                 stat->change_cookie = inode_peek_iversion_raw(inode);
3054                 valid_mask |= STATX_CHANGE_COOKIE;
3055         }
3056
3057         if (ceph_snap(inode) == CEPH_NOSNAP)
3058                 stat->dev = sb->s_dev;
3059         else
3060                 stat->dev = ci->i_snapid_map ? ci->i_snapid_map->dev : 0;
3061
3062         if (S_ISDIR(inode->i_mode)) {
3063                 if (ceph_test_mount_opt(ceph_sb_to_fs_client(sb), RBYTES)) {
3064                         stat->size = ci->i_rbytes;
3065                 } else if (ceph_snap(inode) == CEPH_SNAPDIR) {
3066                         struct ceph_inode_info *pci;
3067                         struct ceph_snap_realm *realm;
3068                         struct inode *parent;
3069
3070                         parent = ceph_lookup_inode(sb, ceph_ino(inode));
3071                         if (IS_ERR(parent))
3072                                 return PTR_ERR(parent);
3073
3074                         pci = ceph_inode(parent);
3075                         spin_lock(&pci->i_ceph_lock);
3076                         realm = pci->i_snap_realm;
3077                         if (realm)
3078                                 stat->size = realm->num_snaps;
3079                         else
3080                                 stat->size = 0;
3081                         spin_unlock(&pci->i_ceph_lock);
3082                         iput(parent);
3083                 } else {
3084                         stat->size = ci->i_files + ci->i_subdirs;
3085                 }
3086                 stat->blocks = 0;
3087                 stat->blksize = 65536;
3088                 /*
3089                  * Some applications rely on the number of st_nlink
3090                  * value on directories to be either 0 (if unlinked)
3091                  * or 2 + number of subdirectories.
3092                  */
3093                 if (stat->nlink == 1)
3094                         /* '.' + '..' + subdirs */
3095                         stat->nlink = 1 + 1 + ci->i_subdirs;
3096         }
3097
3098         stat->attributes |= STATX_ATTR_CHANGE_MONOTONIC;
3099         if (IS_ENCRYPTED(inode))
3100                 stat->attributes |= STATX_ATTR_ENCRYPTED;
3101         stat->attributes_mask |= (STATX_ATTR_CHANGE_MONOTONIC |
3102                                   STATX_ATTR_ENCRYPTED);
3103
3104         stat->result_mask = request_mask & valid_mask;
3105         return err;
3106 }
3107
3108 void ceph_inode_shutdown(struct inode *inode)
3109 {
3110         struct ceph_inode_info *ci = ceph_inode(inode);
3111         struct rb_node *p;
3112         int iputs = 0;
3113         bool invalidate = false;
3114
3115         spin_lock(&ci->i_ceph_lock);
3116         ci->i_ceph_flags |= CEPH_I_SHUTDOWN;
3117         p = rb_first(&ci->i_caps);
3118         while (p) {
3119                 struct ceph_cap *cap = rb_entry(p, struct ceph_cap, ci_node);
3120
3121                 p = rb_next(p);
3122                 iputs += ceph_purge_inode_cap(inode, cap, &invalidate);
3123         }
3124         spin_unlock(&ci->i_ceph_lock);
3125
3126         if (invalidate)
3127                 ceph_queue_invalidate(inode);
3128         while (iputs--)
3129                 iput(inode);
3130 }