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         inode->i_blkbits = CEPH_FSCRYPT_BLOCK_SHIFT;
  82
  83         if (!S_ISLNK(*mode)) {
  84                 err = ceph_pre_init_acls(dir, mode, as_ctx);
  85                 if (err < 0)
  86                         goto out_err;
  87         }
  88
  89         inode->i_state = 0;
  90         inode->i_mode = *mode;
  91
  92         err = ceph_security_init_secctx(dentry, *mode, as_ctx);
  93         if (err < 0)
  94                 goto out_err;
  95
  96         /*
  97          * We'll skip setting fscrypt context for snapshots, leaving that for
  98          * the handle_reply().
  99          */
 100         if (ceph_snap(dir) != CEPH_SNAPDIR) {
 101                 err = ceph_fscrypt_prepare_context(dir, inode, as_ctx);
 102                 if (err)
 103                         goto out_err;
 104         }
 105
 106         return inode;
 107 out_err:
 108         iput(inode);
 109         return ERR_PTR(err);
 110 }
 111
 112 void ceph_as_ctx_to_req(struct ceph_mds_request *req,
 113                         struct ceph_acl_sec_ctx *as_ctx)
 114 {
 115         if (as_ctx->pagelist) {
 116                 req->r_pagelist = as_ctx->pagelist;
 117                 as_ctx->pagelist = NULL;
 118         }
 119         ceph_fscrypt_as_ctx_to_req(req, as_ctx);
 120 }
 121
 122 /**
 123  * ceph_get_inode - find or create/hash a new inode
 124  * @sb: superblock to search and allocate in
 125  * @vino: vino to search for
 126  * @newino: optional new inode to insert if one isn't found (may be NULL)
 127  *
 128  * Search for or insert a new inode into the hash for the given vino, and
 129  * return a reference to it. If new is non-NULL, its reference is consumed.
 130  */
 131 struct inode *ceph_get_inode(struct super_block *sb, struct ceph_vino vino,
 132                              struct inode *newino)
 133 {
 134         struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(sb);
 135         struct ceph_client *cl = mdsc->fsc->client;
 136         struct inode *inode;
 137
 138         if (ceph_vino_is_reserved(vino))
 139                 return ERR_PTR(-EREMOTEIO);
 140
 141         if (newino) {
 142                 inode = inode_insert5(newino, (unsigned long)vino.ino,
 143                                       ceph_ino_compare, ceph_set_ino_cb, &vino);
 144                 if (inode != newino)
 145                         iput(newino);
 146         } else {
 147                 inode = iget5_locked(sb, (unsigned long)vino.ino,
 148                                      ceph_ino_compare, ceph_set_ino_cb, &vino);
 149         }
 150
 151         if (!inode) {
 152                 doutc(cl, "no inode found for %llx.%llx\n", vino.ino, vino.snap);
 153                 return ERR_PTR(-ENOMEM);
 154         }
 155
 156         doutc(cl, "on %llx=%llx.%llx got %p new %d\n",
 157               ceph_present_inode(inode), ceph_vinop(inode), inode,
 158               !!(inode->i_state & I_NEW));
 159         return inode;
 160 }
 161
 162 /*
 163  * get/constuct snapdir inode for a given directory
 164  */
 165 struct inode *ceph_get_snapdir(struct inode *parent)
 166 {
 167         struct ceph_client *cl = ceph_inode_to_client(parent);
 168         struct ceph_vino vino = {
 169                 .ino = ceph_ino(parent),
 170                 .snap = CEPH_SNAPDIR,
 171         };
 172         struct inode *inode = ceph_get_inode(parent->i_sb, vino, NULL);
 173         struct ceph_inode_info *ci = ceph_inode(inode);
 174         int ret = -ENOTDIR;
 175
 176         if (IS_ERR(inode))
 177                 return inode;
 178
 179         if (!S_ISDIR(parent->i_mode)) {
 180                 pr_warn_once_client(cl, "bad snapdir parent type (mode=0%o)\n",
 181                                     parent->i_mode);
 182                 goto err;
 183         }
 184
 185         if (!(inode->i_state & I_NEW) && !S_ISDIR(inode->i_mode)) {
 186                 pr_warn_once_client(cl, "bad snapdir inode type (mode=0%o)\n",
 187                                     inode->i_mode);
 188                 goto err;
 189         }
 190
 191         inode->i_mode = parent->i_mode;
 192         inode->i_uid = parent->i_uid;
 193         inode->i_gid = parent->i_gid;
 194         inode_set_mtime_to_ts(inode, inode_get_mtime(parent));
 195         inode_set_ctime_to_ts(inode, inode_get_ctime(parent));
 196         inode_set_atime_to_ts(inode, inode_get_atime(parent));
 197         ci->i_rbytes = 0;
 198         ci->i_btime = ceph_inode(parent)->i_btime;
 199
 200 #ifdef CONFIG_FS_ENCRYPTION
 201         /* if encrypted, just borrow fscrypt_auth from parent */
 202         if (IS_ENCRYPTED(parent)) {
 203                 struct ceph_inode_info *pci = ceph_inode(parent);
 204
 205                 ci->fscrypt_auth = kmemdup(pci->fscrypt_auth,
 206                                            pci->fscrypt_auth_len,
 207                                            GFP_KERNEL);
 208                 if (ci->fscrypt_auth) {
 209                         inode->i_flags |= S_ENCRYPTED;
 210                         ci->fscrypt_auth_len = pci->fscrypt_auth_len;
 211                 } else {
 212                         doutc(cl, "Failed to alloc snapdir fscrypt_auth\n");
 213                         ret = -ENOMEM;
 214                         goto err;
 215                 }
 216         }
 217 #endif
 218         if (inode->i_state & I_NEW) {
 219                 inode->i_op = &ceph_snapdir_iops;
 220                 inode->i_fop = &ceph_snapdir_fops;
 221                 ci->i_snap_caps = CEPH_CAP_PIN; /* so we can open */
 222                 unlock_new_inode(inode);
 223         }
 224
 225         return inode;
 226 err:
 227         if ((inode->i_state & I_NEW))
 228                 discard_new_inode(inode);
 229         else
 230                 iput(inode);
 231         return ERR_PTR(ret);
 232 }
 233
 234 const struct inode_operations ceph_file_iops = {
 235         .permission = ceph_permission,
 236         .setattr = ceph_setattr,
 237         .getattr = ceph_getattr,
 238         .listxattr = ceph_listxattr,
 239         .get_inode_acl = ceph_get_acl,
 240         .set_acl = ceph_set_acl,
 241 };
 242
 243
 244 /*
 245  * We use a 'frag tree' to keep track of the MDS's directory fragments
 246  * for a given inode (usually there is just a single fragment).  We
 247  * need to know when a child frag is delegated to a new MDS, or when
 248  * it is flagged as replicated, so we can direct our requests
 249  * accordingly.
 250  */
 251
 252 /*
 253  * find/create a frag in the tree
 254  */
 255 static struct ceph_inode_frag *__get_or_create_frag(struct ceph_inode_info *ci,
 256                                                     u32 f)
 257 {
 258         struct inode *inode = &ci->netfs.inode;
 259         struct ceph_client *cl = ceph_inode_to_client(inode);
 260         struct rb_node **p;
 261         struct rb_node *parent = NULL;
 262         struct ceph_inode_frag *frag;
 263         int c;
 264
 265         p = &ci->i_fragtree.rb_node;
 266         while (*p) {
 267                 parent = *p;
 268                 frag = rb_entry(parent, struct ceph_inode_frag, node);
 269                 c = ceph_frag_compare(f, frag->frag);
 270                 if (c < 0)
 271                         p = &(*p)->rb_left;
 272                 else if (c > 0)
 273                         p = &(*p)->rb_right;
 274                 else
 275                         return frag;
 276         }
 277
 278         frag = kmalloc(sizeof(*frag), GFP_NOFS);
 279         if (!frag)
 280                 return ERR_PTR(-ENOMEM);
 281
 282         frag->frag = f;
 283         frag->split_by = 0;
 284         frag->mds = -1;
 285         frag->ndist = 0;
 286
 287         rb_link_node(&frag->node, parent, p);
 288         rb_insert_color(&frag->node, &ci->i_fragtree);
 289
 290         doutc(cl, "added %p %llx.%llx frag %x\n", inode, ceph_vinop(inode), f);
 291         return frag;
 292 }
 293
 294 /*
 295  * find a specific frag @f
 296  */
 297 struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci, u32 f)
 298 {
 299         struct rb_node *n = ci->i_fragtree.rb_node;
 300
 301         while (n) {
 302                 struct ceph_inode_frag *frag =
 303                         rb_entry(n, struct ceph_inode_frag, node);
 304                 int c = ceph_frag_compare(f, frag->frag);
 305                 if (c < 0)
 306                         n = n->rb_left;
 307                 else if (c > 0)
 308                         n = n->rb_right;
 309                 else
 310                         return frag;
 311         }
 312         return NULL;
 313 }
 314
 315 /*
 316  * Choose frag containing the given value @v.  If @pfrag is
 317  * specified, copy the frag delegation info to the caller if
 318  * it is present.
 319  */
 320 static u32 __ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
 321                               struct ceph_inode_frag *pfrag, int *found)
 322 {
 323         struct ceph_client *cl = ceph_inode_to_client(&ci->netfs.inode);
 324         u32 t = ceph_frag_make(0, 0);
 325         struct ceph_inode_frag *frag;
 326         unsigned nway, i;
 327         u32 n;
 328
 329         if (found)
 330                 *found = 0;
 331
 332         while (1) {
 333                 WARN_ON(!ceph_frag_contains_value(t, v));
 334                 frag = __ceph_find_frag(ci, t);
 335                 if (!frag)
 336                         break; /* t is a leaf */
 337                 if (frag->split_by == 0) {
 338                         if (pfrag)
 339                                 memcpy(pfrag, frag, sizeof(*pfrag));
 340                         if (found)
 341                                 *found = 1;
 342                         break;
 343                 }
 344
 345                 /* choose child */
 346                 nway = 1 << frag->split_by;
 347                 doutc(cl, "frag(%x) %x splits by %d (%d ways)\n", v, t,
 348                       frag->split_by, nway);
 349                 for (i = 0; i < nway; i++) {
 350                         n = ceph_frag_make_child(t, frag->split_by, i);
 351                         if (ceph_frag_contains_value(n, v)) {
 352                                 t = n;
 353                                 break;
 354                         }
 355                 }
 356                 BUG_ON(i == nway);
 357         }
 358         doutc(cl, "frag(%x) = %x\n", v, t);
 359
 360         return t;
 361 }
 362
 363 u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
 364                      struct ceph_inode_frag *pfrag, int *found)
 365 {
 366         u32 ret;
 367         mutex_lock(&ci->i_fragtree_mutex);
 368         ret = __ceph_choose_frag(ci, v, pfrag, found);
 369         mutex_unlock(&ci->i_fragtree_mutex);
 370         return ret;
 371 }
 372
 373 /*
 374  * Process dirfrag (delegation) info from the mds.  Include leaf
 375  * fragment in tree ONLY if ndist > 0.  Otherwise, only
 376  * branches/splits are included in i_fragtree)
 377  */
 378 static int ceph_fill_dirfrag(struct inode *inode,
 379                              struct ceph_mds_reply_dirfrag *dirinfo)
 380 {
 381         struct ceph_inode_info *ci = ceph_inode(inode);
 382         struct ceph_client *cl = ceph_inode_to_client(inode);
 383         struct ceph_inode_frag *frag;
 384         u32 id = le32_to_cpu(dirinfo->frag);
 385         int mds = le32_to_cpu(dirinfo->auth);
 386         int ndist = le32_to_cpu(dirinfo->ndist);
 387         int diri_auth = -1;
 388         int i;
 389         int err = 0;
 390
 391         spin_lock(&ci->i_ceph_lock);
 392         if (ci->i_auth_cap)
 393                 diri_auth = ci->i_auth_cap->mds;
 394         spin_unlock(&ci->i_ceph_lock);
 395
 396         if (mds == -1) /* CDIR_AUTH_PARENT */
 397                 mds = diri_auth;
 398
 399         mutex_lock(&ci->i_fragtree_mutex);
 400         if (ndist == 0 && mds == diri_auth) {
 401                 /* no delegation info needed. */
 402                 frag = __ceph_find_frag(ci, id);
 403                 if (!frag)
 404                         goto out;
 405                 if (frag->split_by == 0) {
 406                         /* tree leaf, remove */
 407                         doutc(cl, "removed %p %llx.%llx frag %x (no ref)\n",
 408                               inode, ceph_vinop(inode), id);
 409                         rb_erase(&frag->node, &ci->i_fragtree);
 410                         kfree(frag);
 411                 } else {
 412                         /* tree branch, keep and clear */
 413                         doutc(cl, "cleared %p %llx.%llx frag %x referral\n",
 414                               inode, ceph_vinop(inode), id);
 415                         frag->mds = -1;
 416                         frag->ndist = 0;
 417                 }
 418                 goto out;
 419         }
 420
 421
 422         /* find/add this frag to store mds delegation info */
 423         frag = __get_or_create_frag(ci, id);
 424         if (IS_ERR(frag)) {
 425                 /* this is not the end of the world; we can continue
 426                    with bad/inaccurate delegation info */
 427                 pr_err_client(cl, "ENOMEM on mds ref %p %llx.%llx fg %x\n",
 428                               inode, ceph_vinop(inode),
 429                               le32_to_cpu(dirinfo->frag));
 430                 err = -ENOMEM;
 431                 goto out;
 432         }
 433
 434         frag->mds = mds;
 435         frag->ndist = min_t(u32, ndist, CEPH_MAX_DIRFRAG_REP);
 436         for (i = 0; i < frag->ndist; i++)
 437                 frag->dist[i] = le32_to_cpu(dirinfo->dist[i]);
 438         doutc(cl, "%p %llx.%llx frag %x ndist=%d\n", inode,
 439               ceph_vinop(inode), frag->frag, frag->ndist);
 440
 441 out:
 442         mutex_unlock(&ci->i_fragtree_mutex);
 443         return err;
 444 }
 445
 446 static int frag_tree_split_cmp(const void *l, const void *r)
 447 {
 448         struct ceph_frag_tree_split *ls = (struct ceph_frag_tree_split*)l;
 449         struct ceph_frag_tree_split *rs = (struct ceph_frag_tree_split*)r;
 450         return ceph_frag_compare(le32_to_cpu(ls->frag),
 451                                  le32_to_cpu(rs->frag));
 452 }
 453
 454 static bool is_frag_child(u32 f, struct ceph_inode_frag *frag)
 455 {
 456         if (!frag)
 457                 return f == ceph_frag_make(0, 0);
 458         if (ceph_frag_bits(f) != ceph_frag_bits(frag->frag) + frag->split_by)
 459                 return false;
 460         return ceph_frag_contains_value(frag->frag, ceph_frag_value(f));
 461 }
 462
 463 static int ceph_fill_fragtree(struct inode *inode,
 464                               struct ceph_frag_tree_head *fragtree,
 465                               struct ceph_mds_reply_dirfrag *dirinfo)
 466 {
 467         struct ceph_client *cl = ceph_inode_to_client(inode);
 468         struct ceph_inode_info *ci = ceph_inode(inode);
 469         struct ceph_inode_frag *frag, *prev_frag = NULL;
 470         struct rb_node *rb_node;
 471         unsigned i, split_by, nsplits;
 472         u32 id;
 473         bool update = false;
 474
 475         mutex_lock(&ci->i_fragtree_mutex);
 476         nsplits = le32_to_cpu(fragtree->nsplits);
 477         if (nsplits != ci->i_fragtree_nsplits) {
 478                 update = true;
 479         } else if (nsplits) {
 480                 i = get_random_u32_below(nsplits);
 481                 id = le32_to_cpu(fragtree->splits[i].frag);
 482                 if (!__ceph_find_frag(ci, id))
 483                         update = true;
 484         } else if (!RB_EMPTY_ROOT(&ci->i_fragtree)) {
 485                 rb_node = rb_first(&ci->i_fragtree);
 486                 frag = rb_entry(rb_node, struct ceph_inode_frag, node);
 487                 if (frag->frag != ceph_frag_make(0, 0) || rb_next(rb_node))
 488                         update = true;
 489         }
 490         if (!update && dirinfo) {
 491                 id = le32_to_cpu(dirinfo->frag);
 492                 if (id != __ceph_choose_frag(ci, id, NULL, NULL))
 493                         update = true;
 494         }
 495         if (!update)
 496                 goto out_unlock;
 497
 498         if (nsplits > 1) {
 499                 sort(fragtree->splits, nsplits, sizeof(fragtree->splits[0]),
 500                      frag_tree_split_cmp, NULL);
 501         }
 502
 503         doutc(cl, "%p %llx.%llx\n", inode, ceph_vinop(inode));
 504         rb_node = rb_first(&ci->i_fragtree);
 505         for (i = 0; i < nsplits; i++) {
 506                 id = le32_to_cpu(fragtree->splits[i].frag);
 507                 split_by = le32_to_cpu(fragtree->splits[i].by);
 508                 if (split_by == 0 || ceph_frag_bits(id) + split_by > 24) {
 509                         pr_err_client(cl, "%p %llx.%llx invalid split %d/%u, "
 510                                "frag %x split by %d\n", inode,
 511                                ceph_vinop(inode), i, nsplits, id, split_by);
 512                         continue;
 513                 }
 514                 frag = NULL;
 515                 while (rb_node) {
 516                         frag = rb_entry(rb_node, struct ceph_inode_frag, node);
 517                         if (ceph_frag_compare(frag->frag, id) >= 0) {
 518                                 if (frag->frag != id)
 519                                         frag = NULL;
 520                                 else
 521                                         rb_node = rb_next(rb_node);
 522                                 break;
 523                         }
 524                         rb_node = rb_next(rb_node);
 525                         /* delete stale split/leaf node */
 526                         if (frag->split_by > 0 ||
 527                             !is_frag_child(frag->frag, prev_frag)) {
 528                                 rb_erase(&frag->node, &ci->i_fragtree);
 529                                 if (frag->split_by > 0)
 530                                         ci->i_fragtree_nsplits--;
 531                                 kfree(frag);
 532                         }
 533                         frag = NULL;
 534                 }
 535                 if (!frag) {
 536                         frag = __get_or_create_frag(ci, id);
 537                         if (IS_ERR(frag))
 538                                 continue;
 539                 }
 540                 if (frag->split_by == 0)
 541                         ci->i_fragtree_nsplits++;
 542                 frag->split_by = split_by;
 543                 doutc(cl, " frag %x split by %d\n", frag->frag, frag->split_by);
 544                 prev_frag = frag;
 545         }
 546         while (rb_node) {
 547                 frag = rb_entry(rb_node, struct ceph_inode_frag, node);
 548                 rb_node = rb_next(rb_node);
 549                 /* delete stale split/leaf node */
 550                 if (frag->split_by > 0 ||
 551                     !is_frag_child(frag->frag, prev_frag)) {
 552                         rb_erase(&frag->node, &ci->i_fragtree);
 553                         if (frag->split_by > 0)
 554                                 ci->i_fragtree_nsplits--;
 555                         kfree(frag);
 556                 }
 557         }
 558 out_unlock:
 559         mutex_unlock(&ci->i_fragtree_mutex);
 560         return 0;
 561 }
 562
 563 /*
 564  * initialize a newly allocated inode.
 565  */
 566 struct inode *ceph_alloc_inode(struct super_block *sb)
 567 {
 568         struct ceph_fs_client *fsc = ceph_sb_to_fs_client(sb);
 569         struct ceph_inode_info *ci;
 570         int i;
 571
 572         ci = alloc_inode_sb(sb, ceph_inode_cachep, GFP_NOFS);
 573         if (!ci)
 574                 return NULL;
 575
 576         doutc(fsc->client, "%p\n", &ci->netfs.inode);
 577
 578         /* Set parameters for the netfs library */
 579         netfs_inode_init(&ci->netfs, &ceph_netfs_ops, false);
 580
 581         spin_lock_init(&ci->i_ceph_lock);
 582
 583         ci->i_version = 0;
 584         ci->i_inline_version = 0;
 585         ci->i_time_warp_seq = 0;
 586         ci->i_ceph_flags = 0;
 587         atomic64_set(&ci->i_ordered_count, 1);
 588         atomic64_set(&ci->i_release_count, 1);
 589         atomic64_set(&ci->i_complete_seq[0], 0);
 590         atomic64_set(&ci->i_complete_seq[1], 0);
 591         ci->i_symlink = NULL;
 592
 593         ci->i_max_bytes = 0;
 594         ci->i_max_files = 0;
 595
 596         memset(&ci->i_dir_layout, 0, sizeof(ci->i_dir_layout));
 597         memset(&ci->i_cached_layout, 0, sizeof(ci->i_cached_layout));
 598         RCU_INIT_POINTER(ci->i_layout.pool_ns, NULL);
 599
 600         ci->i_fragtree = RB_ROOT;
 601         mutex_init(&ci->i_fragtree_mutex);
 602
 603         ci->i_xattrs.blob = NULL;
 604         ci->i_xattrs.prealloc_blob = NULL;
 605         ci->i_xattrs.dirty = false;
 606         ci->i_xattrs.index = RB_ROOT;
 607         ci->i_xattrs.count = 0;
 608         ci->i_xattrs.names_size = 0;
 609         ci->i_xattrs.vals_size = 0;
 610         ci->i_xattrs.version = 0;
 611         ci->i_xattrs.index_version = 0;
 612
 613         ci->i_caps = RB_ROOT;
 614         ci->i_auth_cap = NULL;
 615         ci->i_dirty_caps = 0;
 616         ci->i_flushing_caps = 0;
 617         INIT_LIST_HEAD(&ci->i_dirty_item);
 618         INIT_LIST_HEAD(&ci->i_flushing_item);
 619         ci->i_prealloc_cap_flush = NULL;
 620         INIT_LIST_HEAD(&ci->i_cap_flush_list);
 621         init_waitqueue_head(&ci->i_cap_wq);
 622         ci->i_hold_caps_max = 0;
 623         INIT_LIST_HEAD(&ci->i_cap_delay_list);
 624         INIT_LIST_HEAD(&ci->i_cap_snaps);
 625         ci->i_head_snapc = NULL;
 626         ci->i_snap_caps = 0;
 627
 628         ci->i_last_rd = ci->i_last_wr = jiffies - 3600 * HZ;
 629         for (i = 0; i < CEPH_FILE_MODE_BITS; i++)
 630                 ci->i_nr_by_mode[i] = 0;
 631
 632         mutex_init(&ci->i_truncate_mutex);
 633         ci->i_truncate_seq = 0;
 634         ci->i_truncate_size = 0;
 635         ci->i_truncate_pending = 0;
 636         ci->i_truncate_pagecache_size = 0;
 637
 638         ci->i_max_size = 0;
 639         ci->i_reported_size = 0;
 640         ci->i_wanted_max_size = 0;
 641         ci->i_requested_max_size = 0;
 642
 643         ci->i_pin_ref = 0;
 644         ci->i_rd_ref = 0;
 645         ci->i_rdcache_ref = 0;
 646         ci->i_wr_ref = 0;
 647         ci->i_wb_ref = 0;
 648         ci->i_fx_ref = 0;
 649         ci->i_wrbuffer_ref = 0;
 650         ci->i_wrbuffer_ref_head = 0;
 651         atomic_set(&ci->i_filelock_ref, 0);
 652         atomic_set(&ci->i_shared_gen, 1);
 653         ci->i_rdcache_gen = 0;
 654         ci->i_rdcache_revoking = 0;
 655
 656         INIT_LIST_HEAD(&ci->i_unsafe_dirops);
 657         INIT_LIST_HEAD(&ci->i_unsafe_iops);
 658         spin_lock_init(&ci->i_unsafe_lock);
 659
 660         ci->i_snap_realm = NULL;
 661         INIT_LIST_HEAD(&ci->i_snap_realm_item);
 662         INIT_LIST_HEAD(&ci->i_snap_flush_item);
 663
 664         INIT_WORK(&ci->i_work, ceph_inode_work);
 665         ci->i_work_mask = 0;
 666         memset(&ci->i_btime, '\0', sizeof(ci->i_btime));
 667 #ifdef CONFIG_FS_ENCRYPTION
 668         ci->fscrypt_auth = NULL;
 669         ci->fscrypt_auth_len = 0;
 670 #endif
 671         return &ci->netfs.inode;
 672 }
 673
 674 void ceph_free_inode(struct inode *inode)
 675 {
 676         struct ceph_inode_info *ci = ceph_inode(inode);
 677
 678         kfree(ci->i_symlink);
 679 #ifdef CONFIG_FS_ENCRYPTION
 680         kfree(ci->fscrypt_auth);
 681 #endif
 682         fscrypt_free_inode(inode);
 683         kmem_cache_free(ceph_inode_cachep, ci);
 684 }
 685
 686 void ceph_evict_inode(struct inode *inode)
 687 {
 688         struct ceph_inode_info *ci = ceph_inode(inode);
 689         struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb);
 690         struct ceph_client *cl = ceph_inode_to_client(inode);
 691         struct ceph_inode_frag *frag;
 692         struct rb_node *n;
 693
 694         doutc(cl, "%p ino %llx.%llx\n", inode, ceph_vinop(inode));
 695
 696         percpu_counter_dec(&mdsc->metric.total_inodes);
 697
 698         truncate_inode_pages_final(&inode->i_data);
 699         if (inode->i_state & I_PINNING_NETFS_WB)
 700                 ceph_fscache_unuse_cookie(inode, true);
 701         clear_inode(inode);
 702
 703         ceph_fscache_unregister_inode_cookie(ci);
 704         fscrypt_put_encryption_info(inode);
 705
 706         __ceph_remove_caps(ci);
 707
 708         if (__ceph_has_quota(ci, QUOTA_GET_ANY))
 709                 ceph_adjust_quota_realms_count(inode, false);
 710
 711         /*
 712          * we may still have a snap_realm reference if there are stray
 713          * caps in i_snap_caps.
 714          */
 715         if (ci->i_snap_realm) {
 716                 if (ceph_snap(inode) == CEPH_NOSNAP) {
 717                         doutc(cl, " dropping residual ref to snap realm %p\n",
 718                               ci->i_snap_realm);
 719                         ceph_change_snap_realm(inode, NULL);
 720                 } else {
 721                         ceph_put_snapid_map(mdsc, ci->i_snapid_map);
 722                         ci->i_snap_realm = NULL;
 723                 }
 724         }
 725
 726         while ((n = rb_first(&ci->i_fragtree)) != NULL) {
 727                 frag = rb_entry(n, struct ceph_inode_frag, node);
 728                 rb_erase(n, &ci->i_fragtree);
 729                 kfree(frag);
 730         }
 731         ci->i_fragtree_nsplits = 0;
 732
 733         __ceph_destroy_xattrs(ci);
 734         if (ci->i_xattrs.blob)
 735                 ceph_buffer_put(ci->i_xattrs.blob);
 736         if (ci->i_xattrs.prealloc_blob)
 737                 ceph_buffer_put(ci->i_xattrs.prealloc_blob);
 738
 739         ceph_put_string(rcu_dereference_raw(ci->i_layout.pool_ns));
 740         ceph_put_string(rcu_dereference_raw(ci->i_cached_layout.pool_ns));
 741 }
 742
 743 static inline blkcnt_t calc_inode_blocks(u64 size)
 744 {
 745         return (size + (1<<9) - 1) >> 9;
 746 }
 747
 748 /*
 749  * Helpers to fill in size, ctime, mtime, and atime.  We have to be
 750  * careful because either the client or MDS may have more up to date
 751  * info, depending on which capabilities are held, and whether
 752  * time_warp_seq or truncate_seq have increased.  (Ordinarily, mtime
 753  * and size are monotonically increasing, except when utimes() or
 754  * truncate() increments the corresponding _seq values.)
 755  */
 756 int ceph_fill_file_size(struct inode *inode, int issued,
 757                         u32 truncate_seq, u64 truncate_size, u64 size)
 758 {
 759         struct ceph_client *cl = ceph_inode_to_client(inode);
 760         struct ceph_inode_info *ci = ceph_inode(inode);
 761         int queue_trunc = 0;
 762         loff_t isize = i_size_read(inode);
 763
 764         if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) > 0 ||
 765             (truncate_seq == ci->i_truncate_seq && size > isize)) {
 766                 doutc(cl, "size %lld -> %llu\n", isize, size);
 767                 if (size > 0 && S_ISDIR(inode->i_mode)) {
 768                         pr_err_client(cl, "non-zero size for directory\n");
 769                         size = 0;
 770                 }
 771                 i_size_write(inode, size);
 772                 inode->i_blocks = calc_inode_blocks(size);
 773                 /*
 774                  * If we're expanding, then we should be able to just update
 775                  * the existing cookie.
 776                  */
 777                 if (size > isize)
 778                         ceph_fscache_update(inode);
 779                 ci->i_reported_size = size;
 780                 if (truncate_seq != ci->i_truncate_seq) {
 781                         doutc(cl, "truncate_seq %u -> %u\n",
 782                               ci->i_truncate_seq, truncate_seq);
 783                         ci->i_truncate_seq = truncate_seq;
 784
 785                         /* the MDS should have revoked these caps */
 786                         WARN_ON_ONCE(issued & (CEPH_CAP_FILE_RD |
 787                                                CEPH_CAP_FILE_LAZYIO));
 788                         /*
 789                          * If we hold relevant caps, or in the case where we're
 790                          * not the only client referencing this file and we
 791                          * don't hold those caps, then we need to check whether
 792                          * the file is either opened or mmaped
 793                          */
 794                         if ((issued & (CEPH_CAP_FILE_CACHE|
 795                                        CEPH_CAP_FILE_BUFFER)) ||
 796                             mapping_mapped(inode->i_mapping) ||
 797                             __ceph_is_file_opened(ci)) {
 798                                 ci->i_truncate_pending++;
 799                                 queue_trunc = 1;
 800                         }
 801                 }
 802         }
 803
 804         /*
 805          * It's possible that the new sizes of the two consecutive
 806          * size truncations will be in the same fscrypt last block,
 807          * and we need to truncate the corresponding page caches
 808          * anyway.
 809          */
 810         if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) >= 0) {
 811                 doutc(cl, "truncate_size %lld -> %llu, encrypted %d\n",
 812                       ci->i_truncate_size, truncate_size,
 813                       !!IS_ENCRYPTED(inode));
 814
 815                 ci->i_truncate_size = truncate_size;
 816
 817                 if (IS_ENCRYPTED(inode)) {
 818                         doutc(cl, "truncate_pagecache_size %lld -> %llu\n",
 819                               ci->i_truncate_pagecache_size, size);
 820                         ci->i_truncate_pagecache_size = size;
 821                 } else {
 822                         ci->i_truncate_pagecache_size = truncate_size;
 823                 }
 824         }
 825         return queue_trunc;
 826 }
 827
 828 void ceph_fill_file_time(struct inode *inode, int issued,
 829                          u64 time_warp_seq, struct timespec64 *ctime,
 830                          struct timespec64 *mtime, struct timespec64 *atime)
 831 {
 832         struct ceph_client *cl = ceph_inode_to_client(inode);
 833         struct ceph_inode_info *ci = ceph_inode(inode);
 834         struct timespec64 ictime = inode_get_ctime(inode);
 835         int warn = 0;
 836
 837         if (issued & (CEPH_CAP_FILE_EXCL|
 838                       CEPH_CAP_FILE_WR|
 839                       CEPH_CAP_FILE_BUFFER|
 840                       CEPH_CAP_AUTH_EXCL|
 841                       CEPH_CAP_XATTR_EXCL)) {
 842                 if (ci->i_version == 0 ||
 843                     timespec64_compare(ctime, &ictime) > 0) {
 844                         doutc(cl, "ctime %lld.%09ld -> %lld.%09ld inc w/ cap\n",
 845                              ictime.tv_sec, ictime.tv_nsec,
 846                              ctime->tv_sec, ctime->tv_nsec);
 847                         inode_set_ctime_to_ts(inode, *ctime);
 848                 }
 849                 if (ci->i_version == 0 ||
 850                     ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) > 0) {
 851                         /* the MDS did a utimes() */
 852                         doutc(cl, "mtime %lld.%09ld -> %lld.%09ld tw %d -> %d\n",
 853                              inode_get_mtime_sec(inode),
 854                              inode_get_mtime_nsec(inode),
 855                              mtime->tv_sec, mtime->tv_nsec,
 856                              ci->i_time_warp_seq, (int)time_warp_seq);
 857
 858                         inode_set_mtime_to_ts(inode, *mtime);
 859                         inode_set_atime_to_ts(inode, *atime);
 860                         ci->i_time_warp_seq = time_warp_seq;
 861                 } else if (time_warp_seq == ci->i_time_warp_seq) {
 862                         struct timespec64       ts;
 863
 864                         /* nobody did utimes(); take the max */
 865                         ts = inode_get_mtime(inode);
 866                         if (timespec64_compare(mtime, &ts) > 0) {
 867                                 doutc(cl, "mtime %lld.%09ld -> %lld.%09ld inc\n",
 868                                      ts.tv_sec, ts.tv_nsec,
 869                                      mtime->tv_sec, mtime->tv_nsec);
 870                                 inode_set_mtime_to_ts(inode, *mtime);
 871                         }
 872                         ts = inode_get_atime(inode);
 873                         if (timespec64_compare(atime, &ts) > 0) {
 874                                 doutc(cl, "atime %lld.%09ld -> %lld.%09ld inc\n",
 875                                      ts.tv_sec, ts.tv_nsec,
 876                                      atime->tv_sec, atime->tv_nsec);
 877                                 inode_set_atime_to_ts(inode, *atime);
 878                         }
 879                 } else if (issued & CEPH_CAP_FILE_EXCL) {
 880                         /* we did a utimes(); ignore mds values */
 881                 } else {
 882                         warn = 1;
 883                 }
 884         } else {
 885                 /* we have no write|excl caps; whatever the MDS says is true */
 886                 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) >= 0) {
 887                         inode_set_ctime_to_ts(inode, *ctime);
 888                         inode_set_mtime_to_ts(inode, *mtime);
 889                         inode_set_atime_to_ts(inode, *atime);
 890                         ci->i_time_warp_seq = time_warp_seq;
 891                 } else {
 892                         warn = 1;
 893                 }
 894         }
 895         if (warn) /* time_warp_seq shouldn't go backwards */
 896                 doutc(cl, "%p mds time_warp_seq %llu < %u\n", inode,
 897                       time_warp_seq, ci->i_time_warp_seq);
 898 }
 899
 900 #if IS_ENABLED(CONFIG_FS_ENCRYPTION)
 901 static int decode_encrypted_symlink(struct ceph_mds_client *mdsc,
 902                                     const char *encsym,
 903                                     int enclen, u8 **decsym)
 904 {
 905         struct ceph_client *cl = mdsc->fsc->client;
 906         int declen;
 907         u8 *sym;
 908
 909         sym = kmalloc(enclen + 1, GFP_NOFS);
 910         if (!sym)
 911                 return -ENOMEM;
 912
 913         declen = ceph_base64_decode(encsym, enclen, sym);
 914         if (declen < 0) {
 915                 pr_err_client(cl,
 916                         "can't decode symlink (%d). Content: %.*s\n",
 917                         declen, enclen, encsym);
 918                 kfree(sym);
 919                 return -EIO;
 920         }
 921         sym[declen + 1] = '\0';
 922         *decsym = sym;
 923         return declen;
 924 }
 925 #else
 926 static int decode_encrypted_symlink(struct ceph_mds_client *mdsc,
 927                                     const char *encsym,
 928                                     int symlen, u8 **decsym)
 929 {
 930         return -EOPNOTSUPP;
 931 }
 932 #endif
 933
 934 /*
 935  * Populate an inode based on info from mds.  May be called on new or
 936  * existing inodes.
 937  */
 938 int ceph_fill_inode(struct inode *inode, struct page *locked_page,
 939                     struct ceph_mds_reply_info_in *iinfo,
 940                     struct ceph_mds_reply_dirfrag *dirinfo,
 941                     struct ceph_mds_session *session, int cap_fmode,
 942                     struct ceph_cap_reservation *caps_reservation)
 943 {
 944         struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb);
 945         struct ceph_client *cl = mdsc->fsc->client;
 946         struct ceph_mds_reply_inode *info = iinfo->in;
 947         struct ceph_inode_info *ci = ceph_inode(inode);
 948         int issued, new_issued, info_caps;
 949         struct timespec64 mtime, atime, ctime;
 950         struct ceph_buffer *xattr_blob = NULL;
 951         struct ceph_buffer *old_blob = NULL;
 952         struct ceph_string *pool_ns = NULL;
 953         struct ceph_cap *new_cap = NULL;
 954         int err = 0;
 955         bool wake = false;
 956         bool queue_trunc = false;
 957         bool new_version = false;
 958         bool fill_inline = false;
 959         umode_t mode = le32_to_cpu(info->mode);
 960         dev_t rdev = le32_to_cpu(info->rdev);
 961
 962         lockdep_assert_held(&mdsc->snap_rwsem);
 963
 964         doutc(cl, "%p ino %llx.%llx v %llu had %llu\n", inode, ceph_vinop(inode),
 965               le64_to_cpu(info->version), ci->i_version);
 966
 967         /* Once I_NEW is cleared, we can't change type or dev numbers */
 968         if (inode->i_state & I_NEW) {
 969                 inode->i_mode = mode;
 970         } else {
 971                 if (inode_wrong_type(inode, mode)) {
 972                         pr_warn_once_client(cl,
 973                                 "inode type changed! (ino %llx.%llx is 0%o, mds says 0%o)\n",
 974                                 ceph_vinop(inode), inode->i_mode, mode);
 975                         return -ESTALE;
 976                 }
 977
 978                 if ((S_ISCHR(mode) || S_ISBLK(mode)) && inode->i_rdev != rdev) {
 979                         pr_warn_once_client(cl,
 980                                 "dev inode rdev changed! (ino %llx.%llx is %u:%u, mds says %u:%u)\n",
 981                                 ceph_vinop(inode), MAJOR(inode->i_rdev),
 982                                 MINOR(inode->i_rdev), MAJOR(rdev),
 983                                 MINOR(rdev));
 984                         return -ESTALE;
 985                 }
 986         }
 987
 988         info_caps = le32_to_cpu(info->cap.caps);
 989
 990         /* prealloc new cap struct */
 991         if (info_caps && ceph_snap(inode) == CEPH_NOSNAP) {
 992                 new_cap = ceph_get_cap(mdsc, caps_reservation);
 993                 if (!new_cap)
 994                         return -ENOMEM;
 995         }
 996
 997         /*
 998          * prealloc xattr data, if it looks like we'll need it.  only
 999          * if len > 4 (meaning there are actually xattrs; the first 4
1000          * bytes are the xattr count).
1001          */
1002         if (iinfo->xattr_len > 4) {
1003                 xattr_blob = ceph_buffer_new(iinfo->xattr_len, GFP_NOFS);
1004                 if (!xattr_blob)
1005                         pr_err_client(cl, "ENOMEM xattr blob %d bytes\n",
1006                                       iinfo->xattr_len);
1007         }
1008
1009         if (iinfo->pool_ns_len > 0)
1010                 pool_ns = ceph_find_or_create_string(iinfo->pool_ns_data,
1011                                                      iinfo->pool_ns_len);
1012
1013         if (ceph_snap(inode) != CEPH_NOSNAP && !ci->i_snapid_map)
1014                 ci->i_snapid_map = ceph_get_snapid_map(mdsc, ceph_snap(inode));
1015
1016         spin_lock(&ci->i_ceph_lock);
1017
1018         /*
1019          * provided version will be odd if inode value is projected,
1020          * even if stable.  skip the update if we have newer stable
1021          * info (ours>=theirs, e.g. due to racing mds replies), unless
1022          * we are getting projected (unstable) info (in which case the
1023          * version is odd, and we want ours>theirs).
1024          *   us   them
1025          *   2    2     skip
1026          *   3    2     skip
1027          *   3    3     update
1028          */
1029         if (ci->i_version == 0 ||
1030             ((info->cap.flags & CEPH_CAP_FLAG_AUTH) &&
1031              le64_to_cpu(info->version) > (ci->i_version & ~1)))
1032                 new_version = true;
1033
1034         /* Update change_attribute */
1035         inode_set_max_iversion_raw(inode, iinfo->change_attr);
1036
1037         __ceph_caps_issued(ci, &issued);
1038         issued |= __ceph_caps_dirty(ci);
1039         new_issued = ~issued & info_caps;
1040
1041         __ceph_update_quota(ci, iinfo->max_bytes, iinfo->max_files);
1042
1043 #ifdef CONFIG_FS_ENCRYPTION
1044         if (iinfo->fscrypt_auth_len &&
1045             ((inode->i_state & I_NEW) || (ci->fscrypt_auth_len == 0))) {
1046                 kfree(ci->fscrypt_auth);
1047                 ci->fscrypt_auth_len = iinfo->fscrypt_auth_len;
1048                 ci->fscrypt_auth = iinfo->fscrypt_auth;
1049                 iinfo->fscrypt_auth = NULL;
1050                 iinfo->fscrypt_auth_len = 0;
1051                 inode_set_flags(inode, S_ENCRYPTED, S_ENCRYPTED);
1052         }
1053 #endif
1054
1055         if ((new_version || (new_issued & CEPH_CAP_AUTH_SHARED)) &&
1056             (issued & CEPH_CAP_AUTH_EXCL) == 0) {
1057                 inode->i_mode = mode;
1058                 inode->i_uid = make_kuid(&init_user_ns, le32_to_cpu(info->uid));
1059                 inode->i_gid = make_kgid(&init_user_ns, le32_to_cpu(info->gid));
1060                 doutc(cl, "%p %llx.%llx mode 0%o uid.gid %d.%d\n", inode,
1061                       ceph_vinop(inode), inode->i_mode,
1062                       from_kuid(&init_user_ns, inode->i_uid),
1063                       from_kgid(&init_user_ns, inode->i_gid));
1064                 ceph_decode_timespec64(&ci->i_btime, &iinfo->btime);
1065                 ceph_decode_timespec64(&ci->i_snap_btime, &iinfo->snap_btime);
1066         }
1067
1068         /* directories have fl_stripe_unit set to zero */
1069         if (IS_ENCRYPTED(inode))
1070                 inode->i_blkbits = CEPH_FSCRYPT_BLOCK_SHIFT;
1071         else if (le32_to_cpu(info->layout.fl_stripe_unit))
1072                 inode->i_blkbits =
1073                         fls(le32_to_cpu(info->layout.fl_stripe_unit)) - 1;
1074         else
1075                 inode->i_blkbits = CEPH_BLOCK_SHIFT;
1076
1077         if ((new_version || (new_issued & CEPH_CAP_LINK_SHARED)) &&
1078             (issued & CEPH_CAP_LINK_EXCL) == 0)
1079                 set_nlink(inode, le32_to_cpu(info->nlink));
1080
1081         if (new_version || (new_issued & CEPH_CAP_ANY_RD)) {
1082                 /* be careful with mtime, atime, size */
1083                 ceph_decode_timespec64(&atime, &info->atime);
1084                 ceph_decode_timespec64(&mtime, &info->mtime);
1085                 ceph_decode_timespec64(&ctime, &info->ctime);
1086                 ceph_fill_file_time(inode, issued,
1087                                 le32_to_cpu(info->time_warp_seq),
1088                                 &ctime, &mtime, &atime);
1089         }
1090
1091         if (new_version || (info_caps & CEPH_CAP_FILE_SHARED)) {
1092                 ci->i_files = le64_to_cpu(info->files);
1093                 ci->i_subdirs = le64_to_cpu(info->subdirs);
1094         }
1095
1096         if (new_version ||
1097             (new_issued & (CEPH_CAP_ANY_FILE_RD | CEPH_CAP_ANY_FILE_WR))) {
1098                 u64 size = le64_to_cpu(info->size);
1099                 s64 old_pool = ci->i_layout.pool_id;
1100                 struct ceph_string *old_ns;
1101
1102                 ceph_file_layout_from_legacy(&ci->i_layout, &info->layout);
1103                 old_ns = rcu_dereference_protected(ci->i_layout.pool_ns,
1104                                         lockdep_is_held(&ci->i_ceph_lock));
1105                 rcu_assign_pointer(ci->i_layout.pool_ns, pool_ns);
1106
1107                 if (ci->i_layout.pool_id != old_pool || pool_ns != old_ns)
1108                         ci->i_ceph_flags &= ~CEPH_I_POOL_PERM;
1109
1110                 pool_ns = old_ns;
1111
1112                 if (IS_ENCRYPTED(inode) && size &&
1113                     iinfo->fscrypt_file_len == sizeof(__le64)) {
1114                         u64 fsize = __le64_to_cpu(*(__le64 *)iinfo->fscrypt_file);
1115
1116                         if (size == round_up(fsize, CEPH_FSCRYPT_BLOCK_SIZE)) {
1117                                 size = fsize;
1118                         } else {
1119                                 pr_warn_client(cl,
1120                                         "fscrypt size mismatch: size=%llu fscrypt_file=%llu, discarding fscrypt_file size.\n",
1121                                         info->size, size);
1122                         }
1123                 }
1124
1125                 queue_trunc = ceph_fill_file_size(inode, issued,
1126                                         le32_to_cpu(info->truncate_seq),
1127                                         le64_to_cpu(info->truncate_size),
1128                                         size);
1129                 /* only update max_size on auth cap */
1130                 if ((info->cap.flags & CEPH_CAP_FLAG_AUTH) &&
1131                     ci->i_max_size != le64_to_cpu(info->max_size)) {
1132                         doutc(cl, "max_size %lld -> %llu\n",
1133                             ci->i_max_size, le64_to_cpu(info->max_size));
1134                         ci->i_max_size = le64_to_cpu(info->max_size);
1135                 }
1136         }
1137
1138         /* layout and rstat are not tracked by capability, update them if
1139          * the inode info is from auth mds */
1140         if (new_version || (info->cap.flags & CEPH_CAP_FLAG_AUTH)) {
1141                 if (S_ISDIR(inode->i_mode)) {
1142                         ci->i_dir_layout = iinfo->dir_layout;
1143                         ci->i_rbytes = le64_to_cpu(info->rbytes);
1144                         ci->i_rfiles = le64_to_cpu(info->rfiles);
1145                         ci->i_rsubdirs = le64_to_cpu(info->rsubdirs);
1146                         ci->i_dir_pin = iinfo->dir_pin;
1147                         ci->i_rsnaps = iinfo->rsnaps;
1148                         ceph_decode_timespec64(&ci->i_rctime, &info->rctime);
1149                 }
1150         }
1151
1152         /* xattrs */
1153         /* note that if i_xattrs.len <= 4, i_xattrs.data will still be NULL. */
1154         if ((ci->i_xattrs.version == 0 || !(issued & CEPH_CAP_XATTR_EXCL))  &&
1155             le64_to_cpu(info->xattr_version) > ci->i_xattrs.version) {
1156                 if (ci->i_xattrs.blob)
1157                         old_blob = ci->i_xattrs.blob;
1158                 ci->i_xattrs.blob = xattr_blob;
1159                 if (xattr_blob)
1160                         memcpy(ci->i_xattrs.blob->vec.iov_base,
1161                                iinfo->xattr_data, iinfo->xattr_len);
1162                 ci->i_xattrs.version = le64_to_cpu(info->xattr_version);
1163                 ceph_forget_all_cached_acls(inode);
1164                 ceph_security_invalidate_secctx(inode);
1165                 xattr_blob = NULL;
1166         }
1167
1168         /* finally update i_version */
1169         if (le64_to_cpu(info->version) > ci->i_version)
1170                 ci->i_version = le64_to_cpu(info->version);
1171
1172         inode->i_mapping->a_ops = &ceph_aops;
1173
1174         switch (inode->i_mode & S_IFMT) {
1175         case S_IFIFO:
1176         case S_IFBLK:
1177         case S_IFCHR:
1178         case S_IFSOCK:
1179                 inode->i_blkbits = PAGE_SHIFT;
1180                 init_special_inode(inode, inode->i_mode, rdev);
1181                 inode->i_op = &ceph_file_iops;
1182                 break;
1183         case S_IFREG:
1184                 inode->i_op = &ceph_file_iops;
1185                 inode->i_fop = &ceph_file_fops;
1186                 break;
1187         case S_IFLNK:
1188                 if (!ci->i_symlink) {
1189                         u32 symlen = iinfo->symlink_len;
1190                         char *sym;
1191
1192                         spin_unlock(&ci->i_ceph_lock);
1193
1194                         if (IS_ENCRYPTED(inode)) {
1195                                 if (symlen != i_size_read(inode))
1196                                         pr_err_client(cl,
1197                                                 "%p %llx.%llx BAD symlink size %lld\n",
1198                                                 inode, ceph_vinop(inode),
1199                                                 i_size_read(inode));
1200
1201                                 err = decode_encrypted_symlink(mdsc, iinfo->symlink,
1202                                                                symlen, (u8 **)&sym);
1203                                 if (err < 0) {
1204                                         pr_err_client(cl,
1205                                                 "decoding encrypted symlink failed: %d\n",
1206                                                 err);
1207                                         goto out;
1208                                 }
1209                                 symlen = err;
1210                                 i_size_write(inode, symlen);
1211                                 inode->i_blocks = calc_inode_blocks(symlen);
1212                         } else {
1213                                 if (symlen != i_size_read(inode)) {
1214                                         pr_err_client(cl,
1215                                                 "%p %llx.%llx BAD symlink size %lld\n",
1216                                                 inode, ceph_vinop(inode),
1217                                                 i_size_read(inode));
1218                                         i_size_write(inode, symlen);
1219                                         inode->i_blocks = calc_inode_blocks(symlen);
1220                                 }
1221
1222                                 err = -ENOMEM;
1223                                 sym = kstrndup(iinfo->symlink, symlen, GFP_NOFS);
1224                                 if (!sym)
1225                                         goto out;
1226                         }
1227
1228                         spin_lock(&ci->i_ceph_lock);
1229                         if (!ci->i_symlink)
1230                                 ci->i_symlink = sym;
1231                         else
1232                                 kfree(sym); /* lost a race */
1233                 }
1234
1235                 if (IS_ENCRYPTED(inode)) {
1236                         /*
1237                          * Encrypted symlinks need to be decrypted before we can
1238                          * cache their targets in i_link. Don't touch it here.
1239                          */
1240                         inode->i_op = &ceph_encrypted_symlink_iops;
1241                 } else {
1242                         inode->i_link = ci->i_symlink;
1243                         inode->i_op = &ceph_symlink_iops;
1244                 }
1245                 break;
1246         case S_IFDIR:
1247                 inode->i_op = &ceph_dir_iops;
1248                 inode->i_fop = &ceph_dir_fops;
1249                 break;
1250         default:
1251                 pr_err_client(cl, "%p %llx.%llx BAD mode 0%o\n", inode,
1252                               ceph_vinop(inode), inode->i_mode);
1253         }
1254
1255         /* were we issued a capability? */
1256         if (info_caps) {
1257                 if (ceph_snap(inode) == CEPH_NOSNAP) {
1258                         ceph_add_cap(inode, session,
1259                                      le64_to_cpu(info->cap.cap_id),
1260                                      info_caps,
1261                                      le32_to_cpu(info->cap.wanted),
1262                                      le32_to_cpu(info->cap.seq),
1263                                      le32_to_cpu(info->cap.mseq),
1264                                      le64_to_cpu(info->cap.realm),
1265                                      info->cap.flags, &new_cap);
1266
1267                         /* set dir completion flag? */
1268                         if (S_ISDIR(inode->i_mode) &&
1269                             ci->i_files == 0 && ci->i_subdirs == 0 &&
1270                             (info_caps & CEPH_CAP_FILE_SHARED) &&
1271                             (issued & CEPH_CAP_FILE_EXCL) == 0 &&
1272                             !__ceph_dir_is_complete(ci)) {
1273                                 doutc(cl, " marking %p complete (empty)\n",
1274                                       inode);
1275                                 i_size_write(inode, 0);
1276                                 __ceph_dir_set_complete(ci,
1277                                         atomic64_read(&ci->i_release_count),
1278                                         atomic64_read(&ci->i_ordered_count));
1279                         }
1280
1281                         wake = true;
1282                 } else {
1283                         doutc(cl, " %p got snap_caps %s\n", inode,
1284                               ceph_cap_string(info_caps));
1285                         ci->i_snap_caps |= info_caps;
1286                 }
1287         }
1288
1289         if (iinfo->inline_version > 0 &&
1290             iinfo->inline_version >= ci->i_inline_version) {
1291                 int cache_caps = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO;
1292                 ci->i_inline_version = iinfo->inline_version;
1293                 if (ceph_has_inline_data(ci) &&
1294                     (locked_page || (info_caps & cache_caps)))
1295                         fill_inline = true;
1296         }
1297
1298         if (cap_fmode >= 0) {
1299                 if (!info_caps)
1300                         pr_warn_client(cl, "mds issued no caps on %llx.%llx\n",
1301                                        ceph_vinop(inode));
1302                 __ceph_touch_fmode(ci, mdsc, cap_fmode);
1303         }
1304
1305         spin_unlock(&ci->i_ceph_lock);
1306
1307         ceph_fscache_register_inode_cookie(inode);
1308
1309         if (fill_inline)
1310                 ceph_fill_inline_data(inode, locked_page,
1311                                       iinfo->inline_data, iinfo->inline_len);
1312
1313         if (wake)
1314                 wake_up_all(&ci->i_cap_wq);
1315
1316         /* queue truncate if we saw i_size decrease */
1317         if (queue_trunc)
1318                 ceph_queue_vmtruncate(inode);
1319
1320         /* populate frag tree */
1321         if (S_ISDIR(inode->i_mode))
1322                 ceph_fill_fragtree(inode, &info->fragtree, dirinfo);
1323
1324         /* update delegation info? */
1325         if (dirinfo)
1326                 ceph_fill_dirfrag(inode, dirinfo);
1327
1328         err = 0;
1329 out:
1330         if (new_cap)
1331                 ceph_put_cap(mdsc, new_cap);
1332         ceph_buffer_put(old_blob);
1333         ceph_buffer_put(xattr_blob);
1334         ceph_put_string(pool_ns);
1335         return err;
1336 }
1337
1338 /*
1339  * caller should hold session s_mutex and dentry->d_lock.
1340  */
1341 static void __update_dentry_lease(struct inode *dir, struct dentry *dentry,
1342                                   struct ceph_mds_reply_lease *lease,
1343                                   struct ceph_mds_session *session,
1344                                   unsigned long from_time,
1345                                   struct ceph_mds_session **old_lease_session)
1346 {
1347         struct ceph_client *cl = ceph_inode_to_client(dir);
1348         struct ceph_dentry_info *di = ceph_dentry(dentry);
1349         unsigned mask = le16_to_cpu(lease->mask);
1350         long unsigned duration = le32_to_cpu(lease->duration_ms);
1351         long unsigned ttl = from_time + (duration * HZ) / 1000;
1352         long unsigned half_ttl = from_time + (duration * HZ / 2) / 1000;
1353
1354         doutc(cl, "%p duration %lu ms ttl %lu\n", dentry, duration, ttl);
1355
1356         /* only track leases on regular dentries */
1357         if (ceph_snap(dir) != CEPH_NOSNAP)
1358                 return;
1359
1360         if (mask & CEPH_LEASE_PRIMARY_LINK)
1361                 di->flags |= CEPH_DENTRY_PRIMARY_LINK;
1362         else
1363                 di->flags &= ~CEPH_DENTRY_PRIMARY_LINK;
1364
1365         di->lease_shared_gen = atomic_read(&ceph_inode(dir)->i_shared_gen);
1366         if (!(mask & CEPH_LEASE_VALID)) {
1367                 __ceph_dentry_dir_lease_touch(di);
1368                 return;
1369         }
1370
1371         if (di->lease_gen == atomic_read(&session->s_cap_gen) &&
1372             time_before(ttl, di->time))
1373                 return;  /* we already have a newer lease. */
1374
1375         if (di->lease_session && di->lease_session != session) {
1376                 *old_lease_session = di->lease_session;
1377                 di->lease_session = NULL;
1378         }
1379
1380         if (!di->lease_session)
1381                 di->lease_session = ceph_get_mds_session(session);
1382         di->lease_gen = atomic_read(&session->s_cap_gen);
1383         di->lease_seq = le32_to_cpu(lease->seq);
1384         di->lease_renew_after = half_ttl;
1385         di->lease_renew_from = 0;
1386         di->time = ttl;
1387
1388         __ceph_dentry_lease_touch(di);
1389 }
1390
1391 static inline void update_dentry_lease(struct inode *dir, struct dentry *dentry,
1392                                         struct ceph_mds_reply_lease *lease,
1393                                         struct ceph_mds_session *session,
1394                                         unsigned long from_time)
1395 {
1396         struct ceph_mds_session *old_lease_session = NULL;
1397         spin_lock(&dentry->d_lock);
1398         __update_dentry_lease(dir, dentry, lease, session, from_time,
1399                               &old_lease_session);
1400         spin_unlock(&dentry->d_lock);
1401         ceph_put_mds_session(old_lease_session);
1402 }
1403
1404 /*
1405  * update dentry lease without having parent inode locked
1406  */
1407 static void update_dentry_lease_careful(struct dentry *dentry,
1408                                         struct ceph_mds_reply_lease *lease,
1409                                         struct ceph_mds_session *session,
1410                                         unsigned long from_time,
1411                                         char *dname, u32 dname_len,
1412                                         struct ceph_vino *pdvino,
1413                                         struct ceph_vino *ptvino)
1414
1415 {
1416         struct inode *dir;
1417         struct ceph_mds_session *old_lease_session = NULL;
1418
1419         spin_lock(&dentry->d_lock);
1420         /* make sure dentry's name matches target */
1421         if (dentry->d_name.len != dname_len ||
1422             memcmp(dentry->d_name.name, dname, dname_len))
1423                 goto out_unlock;
1424
1425         dir = d_inode(dentry->d_parent);
1426         /* make sure parent matches dvino */
1427         if (!ceph_ino_compare(dir, pdvino))
1428                 goto out_unlock;
1429
1430         /* make sure dentry's inode matches target. NULL ptvino means that
1431          * we expect a negative dentry */
1432         if (ptvino) {
1433                 if (d_really_is_negative(dentry))
1434                         goto out_unlock;
1435                 if (!ceph_ino_compare(d_inode(dentry), ptvino))
1436                         goto out_unlock;
1437         } else {
1438                 if (d_really_is_positive(dentry))
1439                         goto out_unlock;
1440         }
1441
1442         __update_dentry_lease(dir, dentry, lease, session,
1443                               from_time, &old_lease_session);
1444 out_unlock:
1445         spin_unlock(&dentry->d_lock);
1446         ceph_put_mds_session(old_lease_session);
1447 }
1448
1449 /*
1450  * splice a dentry to an inode.
1451  * caller must hold directory i_rwsem for this to be safe.
1452  */
1453 static int splice_dentry(struct dentry **pdn, struct inode *in)
1454 {
1455         struct ceph_client *cl = ceph_inode_to_client(in);
1456         struct dentry *dn = *pdn;
1457         struct dentry *realdn;
1458
1459         BUG_ON(d_inode(dn));
1460
1461         if (S_ISDIR(in->i_mode)) {
1462                 /* If inode is directory, d_splice_alias() below will remove
1463                  * 'realdn' from its origin parent. We need to ensure that
1464                  * origin parent's readdir cache will not reference 'realdn'
1465                  */
1466                 realdn = d_find_any_alias(in);
1467                 if (realdn) {
1468                         struct ceph_dentry_info *di = ceph_dentry(realdn);
1469                         spin_lock(&realdn->d_lock);
1470
1471                         realdn->d_op->d_prune(realdn);
1472
1473                         di->time = jiffies;
1474                         di->lease_shared_gen = 0;
1475                         di->offset = 0;
1476
1477                         spin_unlock(&realdn->d_lock);
1478                         dput(realdn);
1479                 }
1480         }
1481
1482         /* dn must be unhashed */
1483         if (!d_unhashed(dn))
1484                 d_drop(dn);
1485         realdn = d_splice_alias(in, dn);
1486         if (IS_ERR(realdn)) {
1487                 pr_err_client(cl, "error %ld %p inode %p ino %llx.%llx\n",
1488                               PTR_ERR(realdn), dn, in, ceph_vinop(in));
1489                 return PTR_ERR(realdn);
1490         }
1491
1492         if (realdn) {
1493                 doutc(cl, "dn %p (%d) spliced with %p (%d) inode %p ino %llx.%llx\n",
1494                       dn, d_count(dn), realdn, d_count(realdn),
1495                       d_inode(realdn), ceph_vinop(d_inode(realdn)));
1496                 dput(dn);
1497                 *pdn = realdn;
1498         } else {
1499                 BUG_ON(!ceph_dentry(dn));
1500                 doutc(cl, "dn %p attached to %p ino %llx.%llx\n", dn,
1501                       d_inode(dn), ceph_vinop(d_inode(dn)));
1502         }
1503         return 0;
1504 }
1505
1506 /*
1507  * Incorporate results into the local cache.  This is either just
1508  * one inode, or a directory, dentry, and possibly linked-to inode (e.g.,
1509  * after a lookup).
1510  *
1511  * A reply may contain
1512  *         a directory inode along with a dentry.
1513  *  and/or a target inode
1514  *
1515  * Called with snap_rwsem (read).
1516  */
1517 int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req)
1518 {
1519         struct ceph_mds_session *session = req->r_session;
1520         struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1521         struct inode *in = NULL;
1522         struct ceph_vino tvino, dvino;
1523         struct ceph_fs_client *fsc = ceph_sb_to_fs_client(sb);
1524         struct ceph_client *cl = fsc->client;
1525         int err = 0;
1526
1527         doutc(cl, "%p is_dentry %d is_target %d\n", req,
1528               rinfo->head->is_dentry, rinfo->head->is_target);
1529
1530         if (!rinfo->head->is_target && !rinfo->head->is_dentry) {
1531                 doutc(cl, "reply is empty!\n");
1532                 if (rinfo->head->result == 0 && req->r_parent)
1533                         ceph_invalidate_dir_request(req);
1534                 return 0;
1535         }
1536
1537         if (rinfo->head->is_dentry) {
1538                 struct inode *dir = req->r_parent;
1539
1540                 if (dir) {
1541                         err = ceph_fill_inode(dir, NULL, &rinfo->diri,
1542                                               rinfo->dirfrag, session, -1,
1543                                               &req->r_caps_reservation);
1544                         if (err < 0)
1545                                 goto done;
1546                 } else {
1547                         WARN_ON_ONCE(1);
1548                 }
1549
1550                 if (dir && req->r_op == CEPH_MDS_OP_LOOKUPNAME &&
1551                     test_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags) &&
1552                     !test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
1553                         bool is_nokey = false;
1554                         struct qstr dname;
1555                         struct dentry *dn, *parent;
1556                         struct fscrypt_str oname = FSTR_INIT(NULL, 0);
1557                         struct ceph_fname fname = { .dir        = dir,
1558                                                     .name       = rinfo->dname,
1559                                                     .ctext      = rinfo->altname,
1560                                                     .name_len   = rinfo->dname_len,
1561                                                     .ctext_len  = rinfo->altname_len };
1562
1563                         BUG_ON(!rinfo->head->is_target);
1564                         BUG_ON(req->r_dentry);
1565
1566                         parent = d_find_any_alias(dir);
1567                         BUG_ON(!parent);
1568
1569                         err = ceph_fname_alloc_buffer(dir, &oname);
1570                         if (err < 0) {
1571                                 dput(parent);
1572                                 goto done;
1573                         }
1574
1575                         err = ceph_fname_to_usr(&fname, NULL, &oname, &is_nokey);
1576                         if (err < 0) {
1577                                 dput(parent);
1578                                 ceph_fname_free_buffer(dir, &oname);
1579                                 goto done;
1580                         }
1581                         dname.name = oname.name;
1582                         dname.len = oname.len;
1583                         dname.hash = full_name_hash(parent, dname.name, dname.len);
1584                         tvino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1585                         tvino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1586 retry_lookup:
1587                         dn = d_lookup(parent, &dname);
1588                         doutc(cl, "d_lookup on parent=%p name=%.*s got %p\n",
1589                               parent, dname.len, dname.name, dn);
1590
1591                         if (!dn) {
1592                                 dn = d_alloc(parent, &dname);
1593                                 doutc(cl, "d_alloc %p '%.*s' = %p\n", parent,
1594                                       dname.len, dname.name, dn);
1595                                 if (!dn) {
1596                                         dput(parent);
1597                                         ceph_fname_free_buffer(dir, &oname);
1598                                         err = -ENOMEM;
1599                                         goto done;
1600                                 }
1601                                 if (is_nokey) {
1602                                         spin_lock(&dn->d_lock);
1603                                         dn->d_flags |= DCACHE_NOKEY_NAME;
1604                                         spin_unlock(&dn->d_lock);
1605                                 }
1606                                 err = 0;
1607                         } else if (d_really_is_positive(dn) &&
1608                                    (ceph_ino(d_inode(dn)) != tvino.ino ||
1609                                     ceph_snap(d_inode(dn)) != tvino.snap)) {
1610                                 doutc(cl, " dn %p points to wrong inode %p\n",
1611                                       dn, d_inode(dn));
1612                                 ceph_dir_clear_ordered(dir);
1613                                 d_delete(dn);
1614                                 dput(dn);
1615                                 goto retry_lookup;
1616                         }
1617                         ceph_fname_free_buffer(dir, &oname);
1618
1619                         req->r_dentry = dn;
1620                         dput(parent);
1621                 }
1622         }
1623
1624         if (rinfo->head->is_target) {
1625                 /* Should be filled in by handle_reply */
1626                 BUG_ON(!req->r_target_inode);
1627
1628                 in = req->r_target_inode;
1629                 err = ceph_fill_inode(in, req->r_locked_page, &rinfo->targeti,
1630                                 NULL, session,
1631                                 (!test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags) &&
1632                                  !test_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags) &&
1633                                  rinfo->head->result == 0) ?  req->r_fmode : -1,
1634                                 &req->r_caps_reservation);
1635                 if (err < 0) {
1636                         pr_err_client(cl, "badness %p %llx.%llx\n", in,
1637                                       ceph_vinop(in));
1638                         req->r_target_inode = NULL;
1639                         if (in->i_state & I_NEW)
1640                                 discard_new_inode(in);
1641                         else
1642                                 iput(in);
1643                         goto done;
1644                 }
1645                 if (in->i_state & I_NEW)
1646                         unlock_new_inode(in);
1647         }
1648
1649         /*
1650          * ignore null lease/binding on snapdir ENOENT, or else we
1651          * will have trouble splicing in the virtual snapdir later
1652          */
1653         if (rinfo->head->is_dentry &&
1654             !test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags) &&
1655             test_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags) &&
1656             (rinfo->head->is_target || strncmp(req->r_dentry->d_name.name,
1657                                                fsc->mount_options->snapdir_name,
1658                                                req->r_dentry->d_name.len))) {
1659                 /*
1660                  * lookup link rename   : null -> possibly existing inode
1661                  * mknod symlink mkdir  : null -> new inode
1662                  * unlink               : linked -> null
1663                  */
1664                 struct inode *dir = req->r_parent;
1665                 struct dentry *dn = req->r_dentry;
1666                 bool have_dir_cap, have_lease;
1667
1668                 BUG_ON(!dn);
1669                 BUG_ON(!dir);
1670                 BUG_ON(d_inode(dn->d_parent) != dir);
1671
1672                 dvino.ino = le64_to_cpu(rinfo->diri.in->ino);
1673                 dvino.snap = le64_to_cpu(rinfo->diri.in->snapid);
1674
1675                 BUG_ON(ceph_ino(dir) != dvino.ino);
1676                 BUG_ON(ceph_snap(dir) != dvino.snap);
1677
1678                 /* do we have a lease on the whole dir? */
1679                 have_dir_cap =
1680                         (le32_to_cpu(rinfo->diri.in->cap.caps) &
1681                          CEPH_CAP_FILE_SHARED);
1682
1683                 /* do we have a dn lease? */
1684                 have_lease = have_dir_cap ||
1685                         le32_to_cpu(rinfo->dlease->duration_ms);
1686                 if (!have_lease)
1687                         doutc(cl, "no dentry lease or dir cap\n");
1688
1689                 /* rename? */
1690                 if (req->r_old_dentry && req->r_op == CEPH_MDS_OP_RENAME) {
1691                         struct inode *olddir = req->r_old_dentry_dir;
1692                         BUG_ON(!olddir);
1693
1694                         doutc(cl, " src %p '%pd' dst %p '%pd'\n",
1695                               req->r_old_dentry, req->r_old_dentry, dn, dn);
1696                         doutc(cl, "doing d_move %p -> %p\n", req->r_old_dentry, dn);
1697
1698                         /* d_move screws up sibling dentries' offsets */
1699                         ceph_dir_clear_ordered(dir);
1700                         ceph_dir_clear_ordered(olddir);
1701
1702                         d_move(req->r_old_dentry, dn);
1703                         doutc(cl, " src %p '%pd' dst %p '%pd'\n",
1704                               req->r_old_dentry, req->r_old_dentry, dn, dn);
1705
1706                         /* ensure target dentry is invalidated, despite
1707                            rehashing bug in vfs_rename_dir */
1708                         ceph_invalidate_dentry_lease(dn);
1709
1710                         doutc(cl, "dn %p gets new offset %lld\n",
1711                               req->r_old_dentry,
1712                               ceph_dentry(req->r_old_dentry)->offset);
1713
1714                         /* swap r_dentry and r_old_dentry in case that
1715                          * splice_dentry() gets called later. This is safe
1716                          * because no other place will use them */
1717                         req->r_dentry = req->r_old_dentry;
1718                         req->r_old_dentry = dn;
1719                         dn = req->r_dentry;
1720                 }
1721
1722                 /* null dentry? */
1723                 if (!rinfo->head->is_target) {
1724                         doutc(cl, "null dentry\n");
1725                         if (d_really_is_positive(dn)) {
1726                                 doutc(cl, "d_delete %p\n", dn);
1727                                 ceph_dir_clear_ordered(dir);
1728                                 d_delete(dn);
1729                         } else if (have_lease) {
1730                                 if (d_unhashed(dn))
1731                                         d_add(dn, NULL);
1732                         }
1733
1734                         if (!d_unhashed(dn) && have_lease)
1735                                 update_dentry_lease(dir, dn,
1736                                                     rinfo->dlease, session,
1737                                                     req->r_request_started);
1738                         goto done;
1739                 }
1740
1741                 /* attach proper inode */
1742                 if (d_really_is_negative(dn)) {
1743                         ceph_dir_clear_ordered(dir);
1744                         ihold(in);
1745                         err = splice_dentry(&req->r_dentry, in);
1746                         if (err < 0)
1747                                 goto done;
1748                         dn = req->r_dentry;  /* may have spliced */
1749                 } else if (d_really_is_positive(dn) && d_inode(dn) != in) {
1750                         doutc(cl, " %p links to %p %llx.%llx, not %llx.%llx\n",
1751                               dn, d_inode(dn), ceph_vinop(d_inode(dn)),
1752                               ceph_vinop(in));
1753                         d_invalidate(dn);
1754                         have_lease = false;
1755                 }
1756
1757                 if (have_lease) {
1758                         update_dentry_lease(dir, dn,
1759                                             rinfo->dlease, session,
1760                                             req->r_request_started);
1761                 }
1762                 doutc(cl, " final dn %p\n", dn);
1763         } else if ((req->r_op == CEPH_MDS_OP_LOOKUPSNAP ||
1764                     req->r_op == CEPH_MDS_OP_MKSNAP) &&
1765                    test_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags) &&
1766                    !test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
1767                 struct inode *dir = req->r_parent;
1768
1769                 /* fill out a snapdir LOOKUPSNAP dentry */
1770                 BUG_ON(!dir);
1771                 BUG_ON(ceph_snap(dir) != CEPH_SNAPDIR);
1772                 BUG_ON(!req->r_dentry);
1773                 doutc(cl, " linking snapped dir %p to dn %p\n", in,
1774                       req->r_dentry);
1775                 ceph_dir_clear_ordered(dir);
1776                 ihold(in);
1777                 err = splice_dentry(&req->r_dentry, in);
1778                 if (err < 0)
1779                         goto done;
1780         } else if (rinfo->head->is_dentry && req->r_dentry) {
1781                 /* parent inode is not locked, be carefull */
1782                 struct ceph_vino *ptvino = NULL;
1783                 dvino.ino = le64_to_cpu(rinfo->diri.in->ino);
1784                 dvino.snap = le64_to_cpu(rinfo->diri.in->snapid);
1785                 if (rinfo->head->is_target) {
1786                         tvino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1787                         tvino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1788                         ptvino = &tvino;
1789                 }
1790                 update_dentry_lease_careful(req->r_dentry, rinfo->dlease,
1791                                             session, req->r_request_started,
1792                                             rinfo->dname, rinfo->dname_len,
1793                                             &dvino, ptvino);
1794         }
1795 done:
1796         doutc(cl, "done err=%d\n", err);
1797         return err;
1798 }
1799
1800 /*
1801  * Prepopulate our cache with readdir results, leases, etc.
1802  */
1803 static int readdir_prepopulate_inodes_only(struct ceph_mds_request *req,
1804                                            struct ceph_mds_session *session)
1805 {
1806         struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1807         struct ceph_client *cl = session->s_mdsc->fsc->client;
1808         int i, err = 0;
1809
1810         for (i = 0; i < rinfo->dir_nr; i++) {
1811                 struct ceph_mds_reply_dir_entry *rde = rinfo->dir_entries + i;
1812                 struct ceph_vino vino;
1813                 struct inode *in;
1814                 int rc;
1815
1816                 vino.ino = le64_to_cpu(rde->inode.in->ino);
1817                 vino.snap = le64_to_cpu(rde->inode.in->snapid);
1818
1819                 in = ceph_get_inode(req->r_dentry->d_sb, vino, NULL);
1820                 if (IS_ERR(in)) {
1821                         err = PTR_ERR(in);
1822                         doutc(cl, "badness got %d\n", err);
1823                         continue;
1824                 }
1825                 rc = ceph_fill_inode(in, NULL, &rde->inode, NULL, session,
1826                                      -1, &req->r_caps_reservation);
1827                 if (rc < 0) {
1828                         pr_err_client(cl, "inode badness on %p got %d\n", in,
1829                                       rc);
1830                         err = rc;
1831                         if (in->i_state & I_NEW) {
1832                                 ihold(in);
1833                                 discard_new_inode(in);
1834                         }
1835                 } else if (in->i_state & I_NEW) {
1836                         unlock_new_inode(in);
1837                 }
1838
1839                 iput(in);
1840         }
1841
1842         return err;
1843 }
1844
1845 void ceph_readdir_cache_release(struct ceph_readdir_cache_control *ctl)
1846 {
1847         if (ctl->page) {
1848                 kunmap(ctl->page);
1849                 put_page(ctl->page);
1850                 ctl->page = NULL;
1851         }
1852 }
1853
1854 static int fill_readdir_cache(struct inode *dir, struct dentry *dn,
1855                               struct ceph_readdir_cache_control *ctl,
1856                               struct ceph_mds_request *req)
1857 {
1858         struct ceph_client *cl = ceph_inode_to_client(dir);
1859         struct ceph_inode_info *ci = ceph_inode(dir);
1860         unsigned nsize = PAGE_SIZE / sizeof(struct dentry*);
1861         unsigned idx = ctl->index % nsize;
1862         pgoff_t pgoff = ctl->index / nsize;
1863
1864         if (!ctl->page || pgoff != page_index(ctl->page)) {
1865                 ceph_readdir_cache_release(ctl);
1866                 if (idx == 0)
1867                         ctl->page = grab_cache_page(&dir->i_data, pgoff);
1868                 else
1869                         ctl->page = find_lock_page(&dir->i_data, pgoff);
1870                 if (!ctl->page) {
1871                         ctl->index = -1;
1872                         return idx == 0 ? -ENOMEM : 0;
1873                 }
1874                 /* reading/filling the cache are serialized by
1875                  * i_rwsem, no need to use page lock */
1876                 unlock_page(ctl->page);
1877                 ctl->dentries = kmap(ctl->page);
1878                 if (idx == 0)
1879                         memset(ctl->dentries, 0, PAGE_SIZE);
1880         }
1881
1882         if (req->r_dir_release_cnt == atomic64_read(&ci->i_release_count) &&
1883             req->r_dir_ordered_cnt == atomic64_read(&ci->i_ordered_count)) {
1884                 doutc(cl, "dn %p idx %d\n", dn, ctl->index);
1885                 ctl->dentries[idx] = dn;
1886                 ctl->index++;
1887         } else {
1888                 doutc(cl, "disable readdir cache\n");
1889                 ctl->index = -1;
1890         }
1891         return 0;
1892 }
1893
1894 int ceph_readdir_prepopulate(struct ceph_mds_request *req,
1895                              struct ceph_mds_session *session)
1896 {
1897         struct dentry *parent = req->r_dentry;
1898         struct inode *inode = d_inode(parent);
1899         struct ceph_inode_info *ci = ceph_inode(inode);
1900         struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1901         struct ceph_client *cl = session->s_mdsc->fsc->client;
1902         struct qstr dname;
1903         struct dentry *dn;
1904         struct inode *in;
1905         int err = 0, skipped = 0, ret, i;
1906         u32 frag = le32_to_cpu(req->r_args.readdir.frag);
1907         u32 last_hash = 0;
1908         u32 fpos_offset;
1909         struct ceph_readdir_cache_control cache_ctl = {};
1910
1911         if (test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags))
1912                 return readdir_prepopulate_inodes_only(req, session);
1913
1914         if (rinfo->hash_order) {
1915                 if (req->r_path2) {
1916                         last_hash = ceph_str_hash(ci->i_dir_layout.dl_dir_hash,
1917                                                   req->r_path2,
1918                                                   strlen(req->r_path2));
1919                         last_hash = ceph_frag_value(last_hash);
1920                 } else if (rinfo->offset_hash) {
1921                         /* mds understands offset_hash */
1922                         WARN_ON_ONCE(req->r_readdir_offset != 2);
1923                         last_hash = le32_to_cpu(req->r_args.readdir.offset_hash);
1924                 }
1925         }
1926
1927         if (rinfo->dir_dir &&
1928             le32_to_cpu(rinfo->dir_dir->frag) != frag) {
1929                 doutc(cl, "got new frag %x -> %x\n", frag,
1930                             le32_to_cpu(rinfo->dir_dir->frag));
1931                 frag = le32_to_cpu(rinfo->dir_dir->frag);
1932                 if (!rinfo->hash_order)
1933                         req->r_readdir_offset = 2;
1934         }
1935
1936         if (le32_to_cpu(rinfo->head->op) == CEPH_MDS_OP_LSSNAP) {
1937                 doutc(cl, "%d items under SNAPDIR dn %p\n",
1938                       rinfo->dir_nr, parent);
1939         } else {
1940                 doutc(cl, "%d items under dn %p\n", rinfo->dir_nr, parent);
1941                 if (rinfo->dir_dir)
1942                         ceph_fill_dirfrag(d_inode(parent), rinfo->dir_dir);
1943
1944                 if (ceph_frag_is_leftmost(frag) &&
1945                     req->r_readdir_offset == 2 &&
1946                     !(rinfo->hash_order && last_hash)) {
1947                         /* note dir version at start of readdir so we can
1948                          * tell if any dentries get dropped */
1949                         req->r_dir_release_cnt =
1950                                 atomic64_read(&ci->i_release_count);
1951                         req->r_dir_ordered_cnt =
1952                                 atomic64_read(&ci->i_ordered_count);
1953                         req->r_readdir_cache_idx = 0;
1954                 }
1955         }
1956
1957         cache_ctl.index = req->r_readdir_cache_idx;
1958         fpos_offset = req->r_readdir_offset;
1959
1960         /* FIXME: release caps/leases if error occurs */
1961         for (i = 0; i < rinfo->dir_nr; i++) {
1962                 struct ceph_mds_reply_dir_entry *rde = rinfo->dir_entries + i;
1963                 struct ceph_vino tvino;
1964
1965                 dname.name = rde->name;
1966                 dname.len = rde->name_len;
1967                 dname.hash = full_name_hash(parent, dname.name, dname.len);
1968
1969                 tvino.ino = le64_to_cpu(rde->inode.in->ino);
1970                 tvino.snap = le64_to_cpu(rde->inode.in->snapid);
1971
1972                 if (rinfo->hash_order) {
1973                         u32 hash = ceph_frag_value(rde->raw_hash);
1974                         if (hash != last_hash)
1975                                 fpos_offset = 2;
1976                         last_hash = hash;
1977                         rde->offset = ceph_make_fpos(hash, fpos_offset++, true);
1978                 } else {
1979                         rde->offset = ceph_make_fpos(frag, fpos_offset++, false);
1980                 }
1981
1982 retry_lookup:
1983                 dn = d_lookup(parent, &dname);
1984                 doutc(cl, "d_lookup on parent=%p name=%.*s got %p\n",
1985                       parent, dname.len, dname.name, dn);
1986
1987                 if (!dn) {
1988                         dn = d_alloc(parent, &dname);
1989                         doutc(cl, "d_alloc %p '%.*s' = %p\n", parent,
1990                               dname.len, dname.name, dn);
1991                         if (!dn) {
1992                                 doutc(cl, "d_alloc badness\n");
1993                                 err = -ENOMEM;
1994                                 goto out;
1995                         }
1996                         if (rde->is_nokey) {
1997                                 spin_lock(&dn->d_lock);
1998                                 dn->d_flags |= DCACHE_NOKEY_NAME;
1999                                 spin_unlock(&dn->d_lock);
2000                         }
2001                 } else if (d_really_is_positive(dn) &&
2002                            (ceph_ino(d_inode(dn)) != tvino.ino ||
2003                             ceph_snap(d_inode(dn)) != tvino.snap)) {
2004                         struct ceph_dentry_info *di = ceph_dentry(dn);
2005                         doutc(cl, " dn %p points to wrong inode %p\n",
2006                               dn, d_inode(dn));
2007
2008                         spin_lock(&dn->d_lock);
2009                         if (di->offset > 0 &&
2010                             di->lease_shared_gen ==
2011                             atomic_read(&ci->i_shared_gen)) {
2012                                 __ceph_dir_clear_ordered(ci);
2013                                 di->offset = 0;
2014                         }
2015                         spin_unlock(&dn->d_lock);
2016
2017                         d_delete(dn);
2018                         dput(dn);
2019                         goto retry_lookup;
2020                 }
2021
2022                 /* inode */
2023                 if (d_really_is_positive(dn)) {
2024                         in = d_inode(dn);
2025                 } else {
2026                         in = ceph_get_inode(parent->d_sb, tvino, NULL);
2027                         if (IS_ERR(in)) {
2028                                 doutc(cl, "new_inode badness\n");
2029                                 d_drop(dn);
2030                                 dput(dn);
2031                                 err = PTR_ERR(in);
2032                                 goto out;
2033                         }
2034                 }
2035
2036                 ret = ceph_fill_inode(in, NULL, &rde->inode, NULL, session,
2037                                       -1, &req->r_caps_reservation);
2038                 if (ret < 0) {
2039                         pr_err_client(cl, "badness on %p %llx.%llx\n", in,
2040                                       ceph_vinop(in));
2041                         if (d_really_is_negative(dn)) {
2042                                 if (in->i_state & I_NEW) {
2043                                         ihold(in);
2044                                         discard_new_inode(in);
2045                                 }
2046                                 iput(in);
2047                         }
2048                         d_drop(dn);
2049                         err = ret;
2050                         goto next_item;
2051                 }
2052                 if (in->i_state & I_NEW)
2053                         unlock_new_inode(in);
2054
2055                 if (d_really_is_negative(dn)) {
2056                         if (ceph_security_xattr_deadlock(in)) {
2057                                 doutc(cl, " skip splicing dn %p to inode %p"
2058                                       " (security xattr deadlock)\n", dn, in);
2059                                 iput(in);
2060                                 skipped++;
2061                                 goto next_item;
2062                         }
2063
2064                         err = splice_dentry(&dn, in);
2065                         if (err < 0)
2066                                 goto next_item;
2067                 }
2068
2069                 ceph_dentry(dn)->offset = rde->offset;
2070
2071                 update_dentry_lease(d_inode(parent), dn,
2072                                     rde->lease, req->r_session,
2073                                     req->r_request_started);
2074
2075                 if (err == 0 && skipped == 0 && cache_ctl.index >= 0) {
2076                         ret = fill_readdir_cache(d_inode(parent), dn,
2077                                                  &cache_ctl, req);
2078                         if (ret < 0)
2079                                 err = ret;
2080                 }
2081 next_item:
2082                 dput(dn);
2083         }
2084 out:
2085         if (err == 0 && skipped == 0) {
2086                 set_bit(CEPH_MDS_R_DID_PREPOPULATE, &req->r_req_flags);
2087                 req->r_readdir_cache_idx = cache_ctl.index;
2088         }
2089         ceph_readdir_cache_release(&cache_ctl);
2090         doutc(cl, "done\n");
2091         return err;
2092 }
2093
2094 bool ceph_inode_set_size(struct inode *inode, loff_t size)
2095 {
2096         struct ceph_client *cl = ceph_inode_to_client(inode);
2097         struct ceph_inode_info *ci = ceph_inode(inode);
2098         bool ret;
2099
2100         spin_lock(&ci->i_ceph_lock);
2101         doutc(cl, "set_size %p %llu -> %llu\n", inode, i_size_read(inode), size);
2102         i_size_write(inode, size);
2103         ceph_fscache_update(inode);
2104         inode->i_blocks = calc_inode_blocks(size);
2105
2106         ret = __ceph_should_report_size(ci);
2107
2108         spin_unlock(&ci->i_ceph_lock);
2109
2110         return ret;
2111 }
2112
2113 void ceph_queue_inode_work(struct inode *inode, int work_bit)
2114 {
2115         struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);
2116         struct ceph_client *cl = fsc->client;
2117         struct ceph_inode_info *ci = ceph_inode(inode);
2118         set_bit(work_bit, &ci->i_work_mask);
2119
2120         ihold(inode);
2121         if (queue_work(fsc->inode_wq, &ci->i_work)) {
2122                 doutc(cl, "%p %llx.%llx mask=%lx\n", inode,
2123                       ceph_vinop(inode), ci->i_work_mask);
2124         } else {
2125                 doutc(cl, "%p %llx.%llx already queued, mask=%lx\n",
2126                       inode, ceph_vinop(inode), ci->i_work_mask);
2127                 iput(inode);
2128         }
2129 }
2130
2131 static void ceph_do_invalidate_pages(struct inode *inode)
2132 {
2133         struct ceph_client *cl = ceph_inode_to_client(inode);
2134         struct ceph_inode_info *ci = ceph_inode(inode);
2135         u32 orig_gen;
2136         int check = 0;
2137
2138         ceph_fscache_invalidate(inode, false);
2139
2140         mutex_lock(&ci->i_truncate_mutex);
2141
2142         if (ceph_inode_is_shutdown(inode)) {
2143                 pr_warn_ratelimited_client(cl,
2144                         "%p %llx.%llx is shut down\n", inode,
2145                         ceph_vinop(inode));
2146                 mapping_set_error(inode->i_mapping, -EIO);
2147                 truncate_pagecache(inode, 0);
2148                 mutex_unlock(&ci->i_truncate_mutex);
2149                 goto out;
2150         }
2151
2152         spin_lock(&ci->i_ceph_lock);
2153         doutc(cl, "%p %llx.%llx gen %d revoking %d\n", inode,
2154               ceph_vinop(inode), ci->i_rdcache_gen, ci->i_rdcache_revoking);
2155         if (ci->i_rdcache_revoking != ci->i_rdcache_gen) {
2156                 if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE))
2157                         check = 1;
2158                 spin_unlock(&ci->i_ceph_lock);
2159                 mutex_unlock(&ci->i_truncate_mutex);
2160                 goto out;
2161         }
2162         orig_gen = ci->i_rdcache_gen;
2163         spin_unlock(&ci->i_ceph_lock);
2164
2165         if (invalidate_inode_pages2(inode->i_mapping) < 0) {
2166                 pr_err_client(cl, "invalidate_inode_pages2 %llx.%llx failed\n",
2167                               ceph_vinop(inode));
2168         }
2169
2170         spin_lock(&ci->i_ceph_lock);
2171         if (orig_gen == ci->i_rdcache_gen &&
2172             orig_gen == ci->i_rdcache_revoking) {
2173                 doutc(cl, "%p %llx.%llx gen %d successful\n", inode,
2174                       ceph_vinop(inode), ci->i_rdcache_gen);
2175                 ci->i_rdcache_revoking--;
2176                 check = 1;
2177         } else {
2178                 doutc(cl, "%p %llx.%llx gen %d raced, now %d revoking %d\n",
2179                       inode, ceph_vinop(inode), orig_gen, ci->i_rdcache_gen,
2180                       ci->i_rdcache_revoking);
2181                 if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE))
2182                         check = 1;
2183         }
2184         spin_unlock(&ci->i_ceph_lock);
2185         mutex_unlock(&ci->i_truncate_mutex);
2186 out:
2187         if (check)
2188                 ceph_check_caps(ci, 0);
2189 }
2190
2191 /*
2192  * Make sure any pending truncation is applied before doing anything
2193  * that may depend on it.
2194  */
2195 void __ceph_do_pending_vmtruncate(struct inode *inode)
2196 {
2197         struct ceph_client *cl = ceph_inode_to_client(inode);
2198         struct ceph_inode_info *ci = ceph_inode(inode);
2199         u64 to;
2200         int wrbuffer_refs, finish = 0;
2201
2202         mutex_lock(&ci->i_truncate_mutex);
2203 retry:
2204         spin_lock(&ci->i_ceph_lock);
2205         if (ci->i_truncate_pending == 0) {
2206                 doutc(cl, "%p %llx.%llx none pending\n", inode,
2207                       ceph_vinop(inode));
2208                 spin_unlock(&ci->i_ceph_lock);
2209                 mutex_unlock(&ci->i_truncate_mutex);
2210                 return;
2211         }
2212
2213         /*
2214          * make sure any dirty snapped pages are flushed before we
2215          * possibly truncate them.. so write AND block!
2216          */
2217         if (ci->i_wrbuffer_ref_head < ci->i_wrbuffer_ref) {
2218                 spin_unlock(&ci->i_ceph_lock);
2219                 doutc(cl, "%p %llx.%llx flushing snaps first\n", inode,
2220                       ceph_vinop(inode));
2221                 filemap_write_and_wait_range(&inode->i_data, 0,
2222                                              inode->i_sb->s_maxbytes);
2223                 goto retry;
2224         }
2225
2226         /* there should be no reader or writer */
2227         WARN_ON_ONCE(ci->i_rd_ref || ci->i_wr_ref);
2228
2229         to = ci->i_truncate_pagecache_size;
2230         wrbuffer_refs = ci->i_wrbuffer_ref;
2231         doutc(cl, "%p %llx.%llx (%d) to %lld\n", inode, ceph_vinop(inode),
2232               ci->i_truncate_pending, to);
2233         spin_unlock(&ci->i_ceph_lock);
2234
2235         ceph_fscache_resize(inode, to);
2236         truncate_pagecache(inode, to);
2237
2238         spin_lock(&ci->i_ceph_lock);
2239         if (to == ci->i_truncate_pagecache_size) {
2240                 ci->i_truncate_pending = 0;
2241                 finish = 1;
2242         }
2243         spin_unlock(&ci->i_ceph_lock);
2244         if (!finish)
2245                 goto retry;
2246
2247         mutex_unlock(&ci->i_truncate_mutex);
2248
2249         if (wrbuffer_refs == 0)
2250                 ceph_check_caps(ci, 0);
2251
2252         wake_up_all(&ci->i_cap_wq);
2253 }
2254
2255 static void ceph_inode_work(struct work_struct *work)
2256 {
2257         struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
2258                                                  i_work);
2259         struct inode *inode = &ci->netfs.inode;
2260         struct ceph_client *cl = ceph_inode_to_client(inode);
2261
2262         if (test_and_clear_bit(CEPH_I_WORK_WRITEBACK, &ci->i_work_mask)) {
2263                 doutc(cl, "writeback %p %llx.%llx\n", inode, ceph_vinop(inode));
2264                 filemap_fdatawrite(&inode->i_data);
2265         }
2266         if (test_and_clear_bit(CEPH_I_WORK_INVALIDATE_PAGES, &ci->i_work_mask))
2267                 ceph_do_invalidate_pages(inode);
2268
2269         if (test_and_clear_bit(CEPH_I_WORK_VMTRUNCATE, &ci->i_work_mask))
2270                 __ceph_do_pending_vmtruncate(inode);
2271
2272         if (test_and_clear_bit(CEPH_I_WORK_CHECK_CAPS, &ci->i_work_mask))
2273                 ceph_check_caps(ci, 0);
2274
2275         if (test_and_clear_bit(CEPH_I_WORK_FLUSH_SNAPS, &ci->i_work_mask))
2276                 ceph_flush_snaps(ci, NULL);
2277
2278         iput(inode);
2279 }
2280
2281 static const char *ceph_encrypted_get_link(struct dentry *dentry,
2282                                            struct inode *inode,
2283                                            struct delayed_call *done)
2284 {
2285         struct ceph_inode_info *ci = ceph_inode(inode);
2286
2287         if (!dentry)
2288                 return ERR_PTR(-ECHILD);
2289
2290         return fscrypt_get_symlink(inode, ci->i_symlink, i_size_read(inode),
2291                                    done);
2292 }
2293
2294 static int ceph_encrypted_symlink_getattr(struct mnt_idmap *idmap,
2295                                           const struct path *path,
2296                                           struct kstat *stat, u32 request_mask,
2297                                           unsigned int query_flags)
2298 {
2299         int ret;
2300
2301         ret = ceph_getattr(idmap, path, stat, request_mask, query_flags);
2302         if (ret)
2303                 return ret;
2304         return fscrypt_symlink_getattr(path, stat);
2305 }
2306
2307 /*
2308  * symlinks
2309  */
2310 static const struct inode_operations ceph_symlink_iops = {
2311         .get_link = simple_get_link,
2312         .setattr = ceph_setattr,
2313         .getattr = ceph_getattr,
2314         .listxattr = ceph_listxattr,
2315 };
2316
2317 static const struct inode_operations ceph_encrypted_symlink_iops = {
2318         .get_link = ceph_encrypted_get_link,
2319         .setattr = ceph_setattr,
2320         .getattr = ceph_encrypted_symlink_getattr,
2321         .listxattr = ceph_listxattr,
2322 };
2323
2324 /*
2325  * Transfer the encrypted last block to the MDS and the MDS
2326  * will help update it when truncating a smaller size.
2327  *
2328  * We don't support a PAGE_SIZE that is smaller than the
2329  * CEPH_FSCRYPT_BLOCK_SIZE.
2330  */
2331 static int fill_fscrypt_truncate(struct inode *inode,
2332                                  struct ceph_mds_request *req,
2333                                  struct iattr *attr)
2334 {
2335         struct ceph_client *cl = ceph_inode_to_client(inode);
2336         struct ceph_inode_info *ci = ceph_inode(inode);
2337         int boff = attr->ia_size % CEPH_FSCRYPT_BLOCK_SIZE;
2338         loff_t pos, orig_pos = round_down(attr->ia_size,
2339                                           CEPH_FSCRYPT_BLOCK_SIZE);
2340         u64 block = orig_pos >> CEPH_FSCRYPT_BLOCK_SHIFT;
2341         struct ceph_pagelist *pagelist = NULL;
2342         struct kvec iov = {0};
2343         struct iov_iter iter;
2344         struct page *page = NULL;
2345         struct ceph_fscrypt_truncate_size_header header;
2346         int retry_op = 0;
2347         int len = CEPH_FSCRYPT_BLOCK_SIZE;
2348         loff_t i_size = i_size_read(inode);
2349         int got, ret, issued;
2350         u64 objver;
2351
2352         ret = __ceph_get_caps(inode, NULL, CEPH_CAP_FILE_RD, 0, -1, &got);
2353         if (ret < 0)
2354                 return ret;
2355
2356         issued = __ceph_caps_issued(ci, NULL);
2357
2358         doutc(cl, "size %lld -> %lld got cap refs on %s, issued %s\n",
2359               i_size, attr->ia_size, ceph_cap_string(got),
2360               ceph_cap_string(issued));
2361
2362         /* Try to writeback the dirty pagecaches */
2363         if (issued & (CEPH_CAP_FILE_BUFFER)) {
2364                 loff_t lend = orig_pos + CEPH_FSCRYPT_BLOCK_SHIFT - 1;
2365
2366                 ret = filemap_write_and_wait_range(inode->i_mapping,
2367                                                    orig_pos, lend);
2368                 if (ret < 0)
2369                         goto out;
2370         }
2371
2372         page = __page_cache_alloc(GFP_KERNEL);
2373         if (page == NULL) {
2374                 ret = -ENOMEM;
2375                 goto out;
2376         }
2377
2378         pagelist = ceph_pagelist_alloc(GFP_KERNEL);
2379         if (!pagelist) {
2380                 ret = -ENOMEM;
2381                 goto out;
2382         }
2383
2384         iov.iov_base = kmap_local_page(page);
2385         iov.iov_len = len;
2386         iov_iter_kvec(&iter, READ, &iov, 1, len);
2387
2388         pos = orig_pos;
2389         ret = __ceph_sync_read(inode, &pos, &iter, &retry_op, &objver);
2390         if (ret < 0)
2391                 goto out;
2392
2393         /* Insert the header first */
2394         header.ver = 1;
2395         header.compat = 1;
2396         header.change_attr = cpu_to_le64(inode_peek_iversion_raw(inode));
2397
2398         /*
2399          * Always set the block_size to CEPH_FSCRYPT_BLOCK_SIZE,
2400          * because in MDS it may need this to do the truncate.
2401          */
2402         header.block_size = cpu_to_le32(CEPH_FSCRYPT_BLOCK_SIZE);
2403
2404         /*
2405          * If we hit a hole here, we should just skip filling
2406          * the fscrypt for the request, because once the fscrypt
2407          * is enabled, the file will be split into many blocks
2408          * with the size of CEPH_FSCRYPT_BLOCK_SIZE, if there
2409          * has a hole, the hole size should be multiple of block
2410          * size.
2411          *
2412          * If the Rados object doesn't exist, it will be set to 0.
2413          */
2414         if (!objver) {
2415                 doutc(cl, "hit hole, ppos %lld < size %lld\n", pos, i_size);
2416
2417                 header.data_len = cpu_to_le32(8 + 8 + 4);
2418                 header.file_offset = 0;
2419                 ret = 0;
2420         } else {
2421                 header.data_len = cpu_to_le32(8 + 8 + 4 + CEPH_FSCRYPT_BLOCK_SIZE);
2422                 header.file_offset = cpu_to_le64(orig_pos);
2423
2424                 doutc(cl, "encrypt block boff/bsize %d/%lu\n", boff,
2425                       CEPH_FSCRYPT_BLOCK_SIZE);
2426
2427                 /* truncate and zero out the extra contents for the last block */
2428                 memset(iov.iov_base + boff, 0, PAGE_SIZE - boff);
2429
2430                 /* encrypt the last block */
2431                 ret = ceph_fscrypt_encrypt_block_inplace(inode, page,
2432                                                     CEPH_FSCRYPT_BLOCK_SIZE,
2433                                                     0, block,
2434                                                     GFP_KERNEL);
2435                 if (ret)
2436                         goto out;
2437         }
2438
2439         /* Insert the header */
2440         ret = ceph_pagelist_append(pagelist, &header, sizeof(header));
2441         if (ret)
2442                 goto out;
2443
2444         if (header.block_size) {
2445                 /* Append the last block contents to pagelist */
2446                 ret = ceph_pagelist_append(pagelist, iov.iov_base,
2447                                            CEPH_FSCRYPT_BLOCK_SIZE);
2448                 if (ret)
2449                         goto out;
2450         }
2451         req->r_pagelist = pagelist;
2452 out:
2453         doutc(cl, "%p %llx.%llx size dropping cap refs on %s\n", inode,
2454               ceph_vinop(inode), ceph_cap_string(got));
2455         ceph_put_cap_refs(ci, got);
2456         if (iov.iov_base)
2457                 kunmap_local(iov.iov_base);
2458         if (page)
2459                 __free_pages(page, 0);
2460         if (ret && pagelist)
2461                 ceph_pagelist_release(pagelist);
2462         return ret;
2463 }
2464
2465 int __ceph_setattr(struct mnt_idmap *idmap, struct inode *inode,
2466                    struct iattr *attr, struct ceph_iattr *cia)
2467 {
2468         struct ceph_inode_info *ci = ceph_inode(inode);
2469         unsigned int ia_valid = attr->ia_valid;
2470         struct ceph_mds_request *req;
2471         struct ceph_mds_client *mdsc = ceph_sb_to_fs_client(inode->i_sb)->mdsc;
2472         struct ceph_client *cl = ceph_inode_to_client(inode);
2473         struct ceph_cap_flush *prealloc_cf;
2474         loff_t isize = i_size_read(inode);
2475         int issued;
2476         int release = 0, dirtied = 0;
2477         int mask = 0;
2478         int err = 0;
2479         int inode_dirty_flags = 0;
2480         bool lock_snap_rwsem = false;
2481         bool fill_fscrypt;
2482         int truncate_retry = 20; /* The RMW will take around 50ms */
2483
2484 retry:
2485         prealloc_cf = ceph_alloc_cap_flush();
2486         if (!prealloc_cf)
2487                 return -ENOMEM;
2488
2489         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETATTR,
2490                                        USE_AUTH_MDS);
2491         if (IS_ERR(req)) {
2492                 ceph_free_cap_flush(prealloc_cf);
2493                 return PTR_ERR(req);
2494         }
2495
2496         fill_fscrypt = false;
2497         spin_lock(&ci->i_ceph_lock);
2498         issued = __ceph_caps_issued(ci, NULL);
2499
2500         if (!ci->i_head_snapc &&
2501             (issued & (CEPH_CAP_ANY_EXCL | CEPH_CAP_FILE_WR))) {
2502                 lock_snap_rwsem = true;
2503                 if (!down_read_trylock(&mdsc->snap_rwsem)) {
2504                         spin_unlock(&ci->i_ceph_lock);
2505                         down_read(&mdsc->snap_rwsem);
2506                         spin_lock(&ci->i_ceph_lock);
2507                         issued = __ceph_caps_issued(ci, NULL);
2508                 }
2509         }
2510
2511         doutc(cl, "%p %llx.%llx issued %s\n", inode, ceph_vinop(inode),
2512               ceph_cap_string(issued));
2513 #if IS_ENABLED(CONFIG_FS_ENCRYPTION)
2514         if (cia && cia->fscrypt_auth) {
2515                 u32 len = ceph_fscrypt_auth_len(cia->fscrypt_auth);
2516
2517                 if (len > sizeof(*cia->fscrypt_auth)) {
2518                         err = -EINVAL;
2519                         spin_unlock(&ci->i_ceph_lock);
2520                         goto out;
2521                 }
2522
2523                 doutc(cl, "%p %llx.%llx fscrypt_auth len %u to %u)\n", inode,
2524                       ceph_vinop(inode), ci->fscrypt_auth_len, len);
2525
2526                 /* It should never be re-set once set */
2527                 WARN_ON_ONCE(ci->fscrypt_auth);
2528
2529                 if (issued & CEPH_CAP_AUTH_EXCL) {
2530                         dirtied |= CEPH_CAP_AUTH_EXCL;
2531                         kfree(ci->fscrypt_auth);
2532                         ci->fscrypt_auth = (u8 *)cia->fscrypt_auth;
2533                         ci->fscrypt_auth_len = len;
2534                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
2535                            ci->fscrypt_auth_len != len ||
2536                            memcmp(ci->fscrypt_auth, cia->fscrypt_auth, len)) {
2537                         req->r_fscrypt_auth = cia->fscrypt_auth;
2538                         mask |= CEPH_SETATTR_FSCRYPT_AUTH;
2539                         release |= CEPH_CAP_AUTH_SHARED;
2540                 }
2541                 cia->fscrypt_auth = NULL;
2542         }
2543 #else
2544         if (cia && cia->fscrypt_auth) {
2545                 err = -EINVAL;
2546                 spin_unlock(&ci->i_ceph_lock);
2547                 goto out;
2548         }
2549 #endif /* CONFIG_FS_ENCRYPTION */
2550
2551         if (ia_valid & ATTR_UID) {
2552                 kuid_t fsuid = from_vfsuid(idmap, i_user_ns(inode), attr->ia_vfsuid);
2553
2554                 doutc(cl, "%p %llx.%llx uid %d -> %d\n", inode,
2555                       ceph_vinop(inode),
2556                       from_kuid(&init_user_ns, inode->i_uid),
2557                       from_kuid(&init_user_ns, attr->ia_uid));
2558                 if (issued & CEPH_CAP_AUTH_EXCL) {
2559                         inode->i_uid = fsuid;
2560                         dirtied |= CEPH_CAP_AUTH_EXCL;
2561                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
2562                            !uid_eq(fsuid, inode->i_uid)) {
2563                         req->r_args.setattr.uid = cpu_to_le32(
2564                                 from_kuid(&init_user_ns, fsuid));
2565                         mask |= CEPH_SETATTR_UID;
2566                         release |= CEPH_CAP_AUTH_SHARED;
2567                 }
2568         }
2569         if (ia_valid & ATTR_GID) {
2570                 kgid_t fsgid = from_vfsgid(idmap, i_user_ns(inode), attr->ia_vfsgid);
2571
2572                 doutc(cl, "%p %llx.%llx gid %d -> %d\n", inode,
2573                       ceph_vinop(inode),
2574                       from_kgid(&init_user_ns, inode->i_gid),
2575                       from_kgid(&init_user_ns, attr->ia_gid));
2576                 if (issued & CEPH_CAP_AUTH_EXCL) {
2577                         inode->i_gid = fsgid;
2578                         dirtied |= CEPH_CAP_AUTH_EXCL;
2579                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
2580                            !gid_eq(fsgid, inode->i_gid)) {
2581                         req->r_args.setattr.gid = cpu_to_le32(
2582                                 from_kgid(&init_user_ns, fsgid));
2583                         mask |= CEPH_SETATTR_GID;
2584                         release |= CEPH_CAP_AUTH_SHARED;
2585                 }
2586         }
2587         if (ia_valid & ATTR_MODE) {
2588                 doutc(cl, "%p %llx.%llx mode 0%o -> 0%o\n", inode,
2589                       ceph_vinop(inode), inode->i_mode, attr->ia_mode);
2590                 if (issued & CEPH_CAP_AUTH_EXCL) {
2591                         inode->i_mode = attr->ia_mode;
2592                         dirtied |= CEPH_CAP_AUTH_EXCL;
2593                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
2594                            attr->ia_mode != inode->i_mode) {
2595                         inode->i_mode = attr->ia_mode;
2596                         req->r_args.setattr.mode = cpu_to_le32(attr->ia_mode);
2597                         mask |= CEPH_SETATTR_MODE;
2598                         release |= CEPH_CAP_AUTH_SHARED;
2599                 }
2600         }
2601
2602         if (ia_valid & ATTR_ATIME) {
2603                 struct timespec64 atime = inode_get_atime(inode);
2604
2605                 doutc(cl, "%p %llx.%llx atime %lld.%09ld -> %lld.%09ld\n",
2606                       inode, ceph_vinop(inode),
2607                       atime.tv_sec, atime.tv_nsec,
2608                       attr->ia_atime.tv_sec, attr->ia_atime.tv_nsec);
2609                 if (issued & CEPH_CAP_FILE_EXCL) {
2610                         ci->i_time_warp_seq++;
2611                         inode_set_atime_to_ts(inode, attr->ia_atime);
2612                         dirtied |= CEPH_CAP_FILE_EXCL;
2613                 } else if ((issued & CEPH_CAP_FILE_WR) &&
2614                            timespec64_compare(&atime,
2615                                               &attr->ia_atime) < 0) {
2616                         inode_set_atime_to_ts(inode, attr->ia_atime);
2617                         dirtied |= CEPH_CAP_FILE_WR;
2618                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
2619                            !timespec64_equal(&atime, &attr->ia_atime)) {
2620                         ceph_encode_timespec64(&req->r_args.setattr.atime,
2621                                                &attr->ia_atime);
2622                         mask |= CEPH_SETATTR_ATIME;
2623                         release |= CEPH_CAP_FILE_SHARED |
2624                                    CEPH_CAP_FILE_RD | CEPH_CAP_FILE_WR;
2625                 }
2626         }
2627         if (ia_valid & ATTR_SIZE) {
2628                 doutc(cl, "%p %llx.%llx size %lld -> %lld\n", inode,
2629                       ceph_vinop(inode), isize, attr->ia_size);
2630                 /*
2631                  * Only when the new size is smaller and not aligned to
2632                  * CEPH_FSCRYPT_BLOCK_SIZE will the RMW is needed.
2633                  */
2634                 if (IS_ENCRYPTED(inode) && attr->ia_size < isize &&
2635                     (attr->ia_size % CEPH_FSCRYPT_BLOCK_SIZE)) {
2636                         mask |= CEPH_SETATTR_SIZE;
2637                         release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_EXCL |
2638                                    CEPH_CAP_FILE_RD | CEPH_CAP_FILE_WR;
2639                         set_bit(CEPH_MDS_R_FSCRYPT_FILE, &req->r_req_flags);
2640                         mask |= CEPH_SETATTR_FSCRYPT_FILE;
2641                         req->r_args.setattr.size =
2642                                 cpu_to_le64(round_up(attr->ia_size,
2643                                                      CEPH_FSCRYPT_BLOCK_SIZE));
2644                         req->r_args.setattr.old_size =
2645                                 cpu_to_le64(round_up(isize,
2646                                                      CEPH_FSCRYPT_BLOCK_SIZE));
2647                         req->r_fscrypt_file = attr->ia_size;
2648                         fill_fscrypt = true;
2649                 } else if ((issued & CEPH_CAP_FILE_EXCL) && attr->ia_size >= isize) {
2650                         if (attr->ia_size > isize) {
2651                                 i_size_write(inode, attr->ia_size);
2652                                 inode->i_blocks = calc_inode_blocks(attr->ia_size);
2653                                 ci->i_reported_size = attr->ia_size;
2654                                 dirtied |= CEPH_CAP_FILE_EXCL;
2655                                 ia_valid |= ATTR_MTIME;
2656                         }
2657                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
2658                            attr->ia_size != isize) {
2659                         mask |= CEPH_SETATTR_SIZE;
2660                         release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_EXCL |
2661                                    CEPH_CAP_FILE_RD | CEPH_CAP_FILE_WR;
2662                         if (IS_ENCRYPTED(inode) && attr->ia_size) {
2663                                 set_bit(CEPH_MDS_R_FSCRYPT_FILE, &req->r_req_flags);
2664                                 mask |= CEPH_SETATTR_FSCRYPT_FILE;
2665                                 req->r_args.setattr.size =
2666                                         cpu_to_le64(round_up(attr->ia_size,
2667                                                              CEPH_FSCRYPT_BLOCK_SIZE));
2668                                 req->r_args.setattr.old_size =
2669                                         cpu_to_le64(round_up(isize,
2670                                                              CEPH_FSCRYPT_BLOCK_SIZE));
2671                                 req->r_fscrypt_file = attr->ia_size;
2672                         } else {
2673                                 req->r_args.setattr.size = cpu_to_le64(attr->ia_size);
2674                                 req->r_args.setattr.old_size = cpu_to_le64(isize);
2675                                 req->r_fscrypt_file = 0;
2676                         }
2677                 }
2678         }
2679         if (ia_valid & ATTR_MTIME) {
2680                 struct timespec64 mtime = inode_get_mtime(inode);
2681
2682                 doutc(cl, "%p %llx.%llx mtime %lld.%09ld -> %lld.%09ld\n",
2683                       inode, ceph_vinop(inode),
2684                       mtime.tv_sec, mtime.tv_nsec,
2685                       attr->ia_mtime.tv_sec, attr->ia_mtime.tv_nsec);
2686                 if (issued & CEPH_CAP_FILE_EXCL) {
2687                         ci->i_time_warp_seq++;
2688                         inode_set_mtime_to_ts(inode, attr->ia_mtime);
2689                         dirtied |= CEPH_CAP_FILE_EXCL;
2690                 } else if ((issued & CEPH_CAP_FILE_WR) &&
2691                            timespec64_compare(&mtime, &attr->ia_mtime) < 0) {
2692                         inode_set_mtime_to_ts(inode, attr->ia_mtime);
2693                         dirtied |= CEPH_CAP_FILE_WR;
2694                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
2695                            !timespec64_equal(&mtime, &attr->ia_mtime)) {
2696                         ceph_encode_timespec64(&req->r_args.setattr.mtime,
2697                                                &attr->ia_mtime);
2698                         mask |= CEPH_SETATTR_MTIME;
2699                         release |= CEPH_CAP_FILE_SHARED |
2700                                    CEPH_CAP_FILE_RD | CEPH_CAP_FILE_WR;
2701                 }
2702         }
2703
2704         /* these do nothing */
2705         if (ia_valid & ATTR_CTIME) {
2706                 bool only = (ia_valid & (ATTR_SIZE|ATTR_MTIME|ATTR_ATIME|
2707                                          ATTR_MODE|ATTR_UID|ATTR_GID)) == 0;
2708                 doutc(cl, "%p %llx.%llx ctime %lld.%09ld -> %lld.%09ld (%s)\n",
2709                       inode, ceph_vinop(inode),
2710                       inode_get_ctime_sec(inode),
2711                       inode_get_ctime_nsec(inode),
2712                       attr->ia_ctime.tv_sec, attr->ia_ctime.tv_nsec,
2713                       only ? "ctime only" : "ignored");
2714                 if (only) {
2715                         /*
2716                          * if kernel wants to dirty ctime but nothing else,
2717                          * we need to choose a cap to dirty under, or do
2718                          * a almost-no-op setattr
2719                          */
2720                         if (issued & CEPH_CAP_AUTH_EXCL)
2721                                 dirtied |= CEPH_CAP_AUTH_EXCL;
2722                         else if (issued & CEPH_CAP_FILE_EXCL)
2723                                 dirtied |= CEPH_CAP_FILE_EXCL;
2724                         else if (issued & CEPH_CAP_XATTR_EXCL)
2725                                 dirtied |= CEPH_CAP_XATTR_EXCL;
2726                         else
2727                                 mask |= CEPH_SETATTR_CTIME;
2728                 }
2729         }
2730         if (ia_valid & ATTR_FILE)
2731                 doutc(cl, "%p %llx.%llx ATTR_FILE ... hrm!\n", inode,
2732                       ceph_vinop(inode));
2733
2734         if (dirtied) {
2735                 inode_dirty_flags = __ceph_mark_dirty_caps(ci, dirtied,
2736                                                            &prealloc_cf);
2737                 inode_set_ctime_to_ts(inode, attr->ia_ctime);
2738                 inode_inc_iversion_raw(inode);
2739         }
2740
2741         release &= issued;
2742         spin_unlock(&ci->i_ceph_lock);
2743         if (lock_snap_rwsem) {
2744                 up_read(&mdsc->snap_rwsem);
2745                 lock_snap_rwsem = false;
2746         }
2747
2748         if (inode_dirty_flags)
2749                 __mark_inode_dirty(inode, inode_dirty_flags);
2750
2751         if (mask) {
2752                 req->r_inode = inode;
2753                 ihold(inode);
2754                 req->r_inode_drop = release;
2755                 req->r_args.setattr.mask = cpu_to_le32(mask);
2756                 req->r_num_caps = 1;
2757                 req->r_stamp = attr->ia_ctime;
2758                 if (fill_fscrypt) {
2759                         err = fill_fscrypt_truncate(inode, req, attr);
2760                         if (err)
2761                                 goto out;
2762                 }
2763
2764                 /*
2765                  * The truncate request will return -EAGAIN when the
2766                  * last block has been updated just before the MDS
2767                  * successfully gets the xlock for the FILE lock. To
2768                  * avoid corrupting the file contents we need to retry
2769                  * it.
2770                  */
2771                 err = ceph_mdsc_do_request(mdsc, NULL, req);
2772                 if (err == -EAGAIN && truncate_retry--) {
2773                         doutc(cl, "%p %llx.%llx result=%d (%s locally, %d remote), retry it!\n",
2774                               inode, ceph_vinop(inode), err,
2775                               ceph_cap_string(dirtied), mask);
2776                         ceph_mdsc_put_request(req);
2777                         ceph_free_cap_flush(prealloc_cf);
2778                         goto retry;
2779                 }
2780         }
2781 out:
2782         doutc(cl, "%p %llx.%llx result=%d (%s locally, %d remote)\n", inode,
2783               ceph_vinop(inode), err, ceph_cap_string(dirtied), mask);
2784
2785         ceph_mdsc_put_request(req);
2786         ceph_free_cap_flush(prealloc_cf);
2787
2788         if (err >= 0 && (mask & CEPH_SETATTR_SIZE))
2789                 __ceph_do_pending_vmtruncate(inode);
2790
2791         return err;
2792 }
2793
2794 /*
2795  * setattr
2796  */
2797 int ceph_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
2798                  struct iattr *attr)
2799 {
2800         struct inode *inode = d_inode(dentry);
2801         struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);
2802         int err;
2803
2804         if (ceph_snap(inode) != CEPH_NOSNAP)
2805                 return -EROFS;
2806
2807         if (ceph_inode_is_shutdown(inode))
2808                 return -ESTALE;
2809
2810         err = fscrypt_prepare_setattr(dentry, attr);
2811         if (err)
2812                 return err;
2813
2814         err = setattr_prepare(idmap, dentry, attr);
2815         if (err != 0)
2816                 return err;
2817
2818         if ((attr->ia_valid & ATTR_SIZE) &&
2819             attr->ia_size > max(i_size_read(inode), fsc->max_file_size))
2820                 return -EFBIG;
2821
2822         if ((attr->ia_valid & ATTR_SIZE) &&
2823             ceph_quota_is_max_bytes_exceeded(inode, attr->ia_size))
2824                 return -EDQUOT;
2825
2826         err = __ceph_setattr(idmap, inode, attr, NULL);
2827
2828         if (err >= 0 && (attr->ia_valid & ATTR_MODE))
2829                 err = posix_acl_chmod(idmap, dentry, attr->ia_mode);
2830
2831         return err;
2832 }
2833
2834 int ceph_try_to_choose_auth_mds(struct inode *inode, int mask)
2835 {
2836         int issued = ceph_caps_issued(ceph_inode(inode));
2837
2838         /*
2839          * If any 'x' caps is issued we can just choose the auth MDS
2840          * instead of the random replica MDSes. Because only when the
2841          * Locker is in LOCK_EXEC state will the loner client could
2842          * get the 'x' caps. And if we send the getattr requests to
2843          * any replica MDS it must auth pin and tries to rdlock from
2844          * the auth MDS, and then the auth MDS need to do the Locker
2845          * state transition to LOCK_SYNC. And after that the lock state
2846          * will change back.
2847          *
2848          * This cost much when doing the Locker state transition and
2849          * usually will need to revoke caps from clients.
2850          *
2851          * And for the 'Xs' caps for getxattr we will also choose the
2852          * auth MDS, because the MDS side code is buggy due to setxattr
2853          * won't notify the replica MDSes when the values changed and
2854          * the replica MDS will return the old values. Though we will
2855          * fix it in MDS code, but this still makes sense for old ceph.
2856          */
2857         if (((mask & CEPH_CAP_ANY_SHARED) && (issued & CEPH_CAP_ANY_EXCL))
2858             || (mask & (CEPH_STAT_RSTAT | CEPH_STAT_CAP_XATTR)))
2859                 return USE_AUTH_MDS;
2860         else
2861                 return USE_ANY_MDS;
2862 }
2863
2864 /*
2865  * Verify that we have a lease on the given mask.  If not,
2866  * do a getattr against an mds.
2867  */
2868 int __ceph_do_getattr(struct inode *inode, struct page *locked_page,
2869                       int mask, bool force)
2870 {
2871         struct ceph_fs_client *fsc = ceph_sb_to_fs_client(inode->i_sb);
2872         struct ceph_client *cl = fsc->client;
2873         struct ceph_mds_client *mdsc = fsc->mdsc;
2874         struct ceph_mds_request *req;
2875         int mode;
2876         int err;
2877
2878         if (ceph_snap(inode) == CEPH_SNAPDIR) {
2879                 doutc(cl, "inode %p %llx.%llx SNAPDIR\n", inode,
2880                       ceph_vinop(inode));
2881                 return 0;
2882         }
2883
2884         doutc(cl, "inode %p %llx.%llx mask %s mode 0%o\n", inode,
2885               ceph_vinop(inode), ceph_cap_string(mask), inode->i_mode);
2886         if (!force && ceph_caps_issued_mask_metric(ceph_inode(inode), mask, 1))
2887                         return 0;
2888
2889         mode = ceph_try_to_choose_auth_mds(inode, mask);
2890         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, mode);
2891         if (IS_ERR(req))
2892                 return PTR_ERR(req);
2893         req->r_inode = inode;
2894         ihold(inode);
2895         req->r_num_caps = 1;
2896         req->r_args.getattr.mask = cpu_to_le32(mask);
2897         req->r_locked_page = locked_page;
2898         err = ceph_mdsc_do_request(mdsc, NULL, req);
2899         if (locked_page && err == 0) {
2900                 u64 inline_version = req->r_reply_info.targeti.inline_version;
2901                 if (inline_version == 0) {
2902                         /* the reply is supposed to contain inline data */
2903                         err = -EINVAL;
2904                 } else if (inline_version == CEPH_INLINE_NONE ||
2905                            inline_version == 1) {
2906                         err = -ENODATA;
2907                 } else {
2908                         err = req->r_reply_info.targeti.inline_len;
2909                 }
2910         }
2911         ceph_mdsc_put_request(req);
2912         doutc(cl, "result=%d\n", err);
2913         return err;
2914 }
2915
2916 int ceph_do_getvxattr(struct inode *inode, const char *name, void *value,
2917                       size_t size)
2918 {
2919         struct ceph_fs_client *fsc = ceph_sb_to_fs_client(inode->i_sb);
2920         struct ceph_client *cl = fsc->client;
2921         struct ceph_mds_client *mdsc = fsc->mdsc;
2922         struct ceph_mds_request *req;
2923         int mode = USE_AUTH_MDS;
2924         int err;
2925         char *xattr_value;
2926         size_t xattr_value_len;
2927
2928         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETVXATTR, mode);
2929         if (IS_ERR(req)) {
2930                 err = -ENOMEM;
2931                 goto out;
2932         }
2933
2934         req->r_feature_needed = CEPHFS_FEATURE_OP_GETVXATTR;
2935         req->r_path2 = kstrdup(name, GFP_NOFS);
2936         if (!req->r_path2) {
2937                 err = -ENOMEM;
2938                 goto put;
2939         }
2940
2941         ihold(inode);
2942         req->r_inode = inode;
2943         err = ceph_mdsc_do_request(mdsc, NULL, req);
2944         if (err < 0)
2945                 goto put;
2946
2947         xattr_value = req->r_reply_info.xattr_info.xattr_value;
2948         xattr_value_len = req->r_reply_info.xattr_info.xattr_value_len;
2949
2950         doutc(cl, "xattr_value_len:%zu, size:%zu\n", xattr_value_len, size);
2951
2952         err = (int)xattr_value_len;
2953         if (size == 0)
2954                 goto put;
2955
2956         if (xattr_value_len > size) {
2957                 err = -ERANGE;
2958                 goto put;
2959         }
2960
2961         memcpy(value, xattr_value, xattr_value_len);
2962 put:
2963         ceph_mdsc_put_request(req);
2964 out:
2965         doutc(cl, "result=%d\n", err);
2966         return err;
2967 }
2968
2969
2970 /*
2971  * Check inode permissions.  We verify we have a valid value for
2972  * the AUTH cap, then call the generic handler.
2973  */
2974 int ceph_permission(struct mnt_idmap *idmap, struct inode *inode,
2975                     int mask)
2976 {
2977         int err;
2978
2979         if (mask & MAY_NOT_BLOCK)
2980                 return -ECHILD;
2981
2982         err = ceph_do_getattr(inode, CEPH_CAP_AUTH_SHARED, false);
2983
2984         if (!err)
2985                 err = generic_permission(idmap, inode, mask);
2986         return err;
2987 }
2988
2989 /* Craft a mask of needed caps given a set of requested statx attrs. */
2990 static int statx_to_caps(u32 want, umode_t mode)
2991 {
2992         int mask = 0;
2993
2994         if (want & (STATX_MODE|STATX_UID|STATX_GID|STATX_CTIME|STATX_BTIME|STATX_CHANGE_COOKIE))
2995                 mask |= CEPH_CAP_AUTH_SHARED;
2996
2997         if (want & (STATX_NLINK|STATX_CTIME|STATX_CHANGE_COOKIE)) {
2998                 /*
2999                  * The link count for directories depends on inode->i_subdirs,
3000                  * and that is only updated when Fs caps are held.
3001                  */
3002                 if (S_ISDIR(mode))
3003                         mask |= CEPH_CAP_FILE_SHARED;
3004                 else
3005                         mask |= CEPH_CAP_LINK_SHARED;
3006         }
3007
3008         if (want & (STATX_ATIME|STATX_MTIME|STATX_CTIME|STATX_SIZE|STATX_BLOCKS|STATX_CHANGE_COOKIE))
3009                 mask |= CEPH_CAP_FILE_SHARED;
3010
3011         if (want & (STATX_CTIME|STATX_CHANGE_COOKIE))
3012                 mask |= CEPH_CAP_XATTR_SHARED;
3013
3014         return mask;
3015 }
3016
3017 /*
3018  * Get all the attributes. If we have sufficient caps for the requested attrs,
3019  * then we can avoid talking to the MDS at all.
3020  */
3021 int ceph_getattr(struct mnt_idmap *idmap, const struct path *path,
3022                  struct kstat *stat, u32 request_mask, unsigned int flags)
3023 {
3024         struct inode *inode = d_inode(path->dentry);
3025         struct super_block *sb = inode->i_sb;
3026         struct ceph_inode_info *ci = ceph_inode(inode);
3027         u32 valid_mask = STATX_BASIC_STATS;
3028         int err = 0;
3029
3030         if (ceph_inode_is_shutdown(inode))
3031                 return -ESTALE;
3032
3033         /* Skip the getattr altogether if we're asked not to sync */
3034         if ((flags & AT_STATX_SYNC_TYPE) != AT_STATX_DONT_SYNC) {
3035                 err = ceph_do_getattr(inode,
3036                                 statx_to_caps(request_mask, inode->i_mode),
3037                                 flags & AT_STATX_FORCE_SYNC);
3038                 if (err)
3039                         return err;
3040         }
3041
3042         generic_fillattr(idmap, request_mask, inode, stat);
3043         stat->ino = ceph_present_inode(inode);
3044
3045         /*
3046          * btime on newly-allocated inodes is 0, so if this is still set to
3047          * that, then assume that it's not valid.
3048          */
3049         if (ci->i_btime.tv_sec || ci->i_btime.tv_nsec) {
3050                 stat->btime = ci->i_btime;
3051                 valid_mask |= STATX_BTIME;
3052         }
3053
3054         if (request_mask & STATX_CHANGE_COOKIE) {
3055                 stat->change_cookie = inode_peek_iversion_raw(inode);
3056                 valid_mask |= STATX_CHANGE_COOKIE;
3057         }
3058
3059         if (ceph_snap(inode) == CEPH_NOSNAP)
3060                 stat->dev = sb->s_dev;
3061         else
3062                 stat->dev = ci->i_snapid_map ? ci->i_snapid_map->dev : 0;
3063
3064         if (S_ISDIR(inode->i_mode)) {
3065                 if (ceph_test_mount_opt(ceph_sb_to_fs_client(sb), RBYTES)) {
3066                         stat->size = ci->i_rbytes;
3067                 } else if (ceph_snap(inode) == CEPH_SNAPDIR) {
3068                         struct ceph_inode_info *pci;
3069                         struct ceph_snap_realm *realm;
3070                         struct inode *parent;
3071
3072                         parent = ceph_lookup_inode(sb, ceph_ino(inode));
3073                         if (IS_ERR(parent))
3074                                 return PTR_ERR(parent);
3075
3076                         pci = ceph_inode(parent);
3077                         spin_lock(&pci->i_ceph_lock);
3078                         realm = pci->i_snap_realm;
3079                         if (realm)
3080                                 stat->size = realm->num_snaps;
3081                         else
3082                                 stat->size = 0;
3083                         spin_unlock(&pci->i_ceph_lock);
3084                         iput(parent);
3085                 } else {
3086                         stat->size = ci->i_files + ci->i_subdirs;
3087                 }
3088                 stat->blocks = 0;
3089                 stat->blksize = 65536;
3090                 /*
3091                  * Some applications rely on the number of st_nlink
3092                  * value on directories to be either 0 (if unlinked)
3093                  * or 2 + number of subdirectories.
3094                  */
3095                 if (stat->nlink == 1)
3096                         /* '.' + '..' + subdirs */
3097                         stat->nlink = 1 + 1 + ci->i_subdirs;
3098         }
3099
3100         stat->attributes |= STATX_ATTR_CHANGE_MONOTONIC;
3101         if (IS_ENCRYPTED(inode))
3102                 stat->attributes |= STATX_ATTR_ENCRYPTED;
3103         stat->attributes_mask |= (STATX_ATTR_CHANGE_MONOTONIC |
3104                                   STATX_ATTR_ENCRYPTED);
3105
3106         stat->result_mask = request_mask & valid_mask;
3107         return err;
3108 }
3109
3110 void ceph_inode_shutdown(struct inode *inode)
3111 {
3112         struct ceph_inode_info *ci = ceph_inode(inode);
3113         struct rb_node *p;
3114         int iputs = 0;
3115         bool invalidate = false;
3116
3117         spin_lock(&ci->i_ceph_lock);
3118         ci->i_ceph_flags |= CEPH_I_SHUTDOWN;
3119         p = rb_first(&ci->i_caps);
3120         while (p) {
3121                 struct ceph_cap *cap = rb_entry(p, struct ceph_cap, ci_node);
3122
3123                 p = rb_next(p);
3124                 iputs += ceph_purge_inode_cap(inode, cap, &invalidate);
3125         }
3126         spin_unlock(&ci->i_ceph_lock);
3127
3128         if (invalidate)
3129                 ceph_queue_invalidate(inode);
3130         while (iputs--)
3131                 iput(inode);
3132 }