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         netfs_wait_for_outstanding_io(inode);
 699         truncate_inode_pages_final(&inode->i_data);
 700         if (inode->i_state & I_PINNING_NETFS_WB)
 701                 ceph_fscache_unuse_cookie(inode, true);
 702         clear_inode(inode);
 703
 704         ceph_fscache_unregister_inode_cookie(ci);
 705         fscrypt_put_encryption_info(inode);
 706
 707         __ceph_remove_caps(ci);
 708
 709         if (__ceph_has_quota(ci, QUOTA_GET_ANY))
 710                 ceph_adjust_quota_realms_count(inode, false);
 711
 712         /*
 713          * we may still have a snap_realm reference if there are stray
 714          * caps in i_snap_caps.
 715          */
 716         if (ci->i_snap_realm) {
 717                 if (ceph_snap(inode) == CEPH_NOSNAP) {
 718                         doutc(cl, " dropping residual ref to snap realm %p\n",
 719                               ci->i_snap_realm);
 720                         ceph_change_snap_realm(inode, NULL);
 721                 } else {
 722                         ceph_put_snapid_map(mdsc, ci->i_snapid_map);
 723                         ci->i_snap_realm = NULL;
 724                 }
 725         }
 726
 727         while ((n = rb_first(&ci->i_fragtree)) != NULL) {
 728                 frag = rb_entry(n, struct ceph_inode_frag, node);
 729                 rb_erase(n, &ci->i_fragtree);
 730                 kfree(frag);
 731         }
 732         ci->i_fragtree_nsplits = 0;
 733
 734         __ceph_destroy_xattrs(ci);
 735         if (ci->i_xattrs.blob)
 736                 ceph_buffer_put(ci->i_xattrs.blob);
 737         if (ci->i_xattrs.prealloc_blob)
 738                 ceph_buffer_put(ci->i_xattrs.prealloc_blob);
 739
 740         ceph_put_string(rcu_dereference_raw(ci->i_layout.pool_ns));
 741         ceph_put_string(rcu_dereference_raw(ci->i_cached_layout.pool_ns));
 742 }
 743
 744 static inline blkcnt_t calc_inode_blocks(u64 size)
 745 {
 746         return (size + (1<<9) - 1) >> 9;
 747 }
 748
 749 /*
 750  * Helpers to fill in size, ctime, mtime, and atime.  We have to be
 751  * careful because either the client or MDS may have more up to date
 752  * info, depending on which capabilities are held, and whether
 753  * time_warp_seq or truncate_seq have increased.  (Ordinarily, mtime
 754  * and size are monotonically increasing, except when utimes() or
 755  * truncate() increments the corresponding _seq values.)
 756  */
 757 int ceph_fill_file_size(struct inode *inode, int issued,
 758                         u32 truncate_seq, u64 truncate_size, u64 size)
 759 {
 760         struct ceph_client *cl = ceph_inode_to_client(inode);
 761         struct ceph_inode_info *ci = ceph_inode(inode);
 762         int queue_trunc = 0;
 763         loff_t isize = i_size_read(inode);
 764
 765         if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) > 0 ||
 766             (truncate_seq == ci->i_truncate_seq && size > isize)) {
 767                 doutc(cl, "size %lld -> %llu\n", isize, size);
 768                 if (size > 0 && S_ISDIR(inode->i_mode)) {
 769                         pr_err_client(cl, "non-zero size for directory\n");
 770                         size = 0;
 771                 }
 772                 i_size_write(inode, size);
 773                 inode->i_blocks = calc_inode_blocks(size);
 774                 /*
 775                  * If we're expanding, then we should be able to just update
 776                  * the existing cookie.
 777                  */
 778                 if (size > isize)
 779                         ceph_fscache_update(inode);
 780                 ci->i_reported_size = size;
 781                 if (truncate_seq != ci->i_truncate_seq) {
 782                         doutc(cl, "truncate_seq %u -> %u\n",
 783                               ci->i_truncate_seq, truncate_seq);
 784                         ci->i_truncate_seq = truncate_seq;
 785
 786                         /* the MDS should have revoked these caps */
 787                         WARN_ON_ONCE(issued & (CEPH_CAP_FILE_RD |
 788                                                CEPH_CAP_FILE_LAZYIO));
 789                         /*
 790                          * If we hold relevant caps, or in the case where we're
 791                          * not the only client referencing this file and we
 792                          * don't hold those caps, then we need to check whether
 793                          * the file is either opened or mmaped
 794                          */
 795                         if ((issued & (CEPH_CAP_FILE_CACHE|
 796                                        CEPH_CAP_FILE_BUFFER)) ||
 797                             mapping_mapped(inode->i_mapping) ||
 798                             __ceph_is_file_opened(ci)) {
 799                                 ci->i_truncate_pending++;
 800                                 queue_trunc = 1;
 801                         }
 802                 }
 803         }
 804
 805         /*
 806          * It's possible that the new sizes of the two consecutive
 807          * size truncations will be in the same fscrypt last block,
 808          * and we need to truncate the corresponding page caches
 809          * anyway.
 810          */
 811         if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) >= 0) {
 812                 doutc(cl, "truncate_size %lld -> %llu, encrypted %d\n",
 813                       ci->i_truncate_size, truncate_size,
 814                       !!IS_ENCRYPTED(inode));
 815
 816                 ci->i_truncate_size = truncate_size;
 817
 818                 if (IS_ENCRYPTED(inode)) {
 819                         doutc(cl, "truncate_pagecache_size %lld -> %llu\n",
 820                               ci->i_truncate_pagecache_size, size);
 821                         ci->i_truncate_pagecache_size = size;
 822                 } else {
 823                         ci->i_truncate_pagecache_size = truncate_size;
 824                 }
 825         }
 826         return queue_trunc;
 827 }
 828
 829 void ceph_fill_file_time(struct inode *inode, int issued,
 830                          u64 time_warp_seq, struct timespec64 *ctime,
 831                          struct timespec64 *mtime, struct timespec64 *atime)
 832 {
 833         struct ceph_client *cl = ceph_inode_to_client(inode);
 834         struct ceph_inode_info *ci = ceph_inode(inode);
 835         struct timespec64 ictime = inode_get_ctime(inode);
 836         int warn = 0;
 837
 838         if (issued & (CEPH_CAP_FILE_EXCL|
 839                       CEPH_CAP_FILE_WR|
 840                       CEPH_CAP_FILE_BUFFER|
 841                       CEPH_CAP_AUTH_EXCL|
 842                       CEPH_CAP_XATTR_EXCL)) {
 843                 if (ci->i_version == 0 ||
 844                     timespec64_compare(ctime, &ictime) > 0) {
 845                         doutc(cl, "ctime %lld.%09ld -> %lld.%09ld inc w/ cap\n",
 846                              ictime.tv_sec, ictime.tv_nsec,
 847                              ctime->tv_sec, ctime->tv_nsec);
 848                         inode_set_ctime_to_ts(inode, *ctime);
 849                 }
 850                 if (ci->i_version == 0 ||
 851                     ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) > 0) {
 852                         /* the MDS did a utimes() */
 853                         doutc(cl, "mtime %lld.%09ld -> %lld.%09ld tw %d -> %d\n",
 854                              inode_get_mtime_sec(inode),
 855                              inode_get_mtime_nsec(inode),
 856                              mtime->tv_sec, mtime->tv_nsec,
 857                              ci->i_time_warp_seq, (int)time_warp_seq);
 858
 859                         inode_set_mtime_to_ts(inode, *mtime);
 860                         inode_set_atime_to_ts(inode, *atime);
 861                         ci->i_time_warp_seq = time_warp_seq;
 862                 } else if (time_warp_seq == ci->i_time_warp_seq) {
 863                         struct timespec64       ts;
 864
 865                         /* nobody did utimes(); take the max */
 866                         ts = inode_get_mtime(inode);
 867                         if (timespec64_compare(mtime, &ts) > 0) {
 868                                 doutc(cl, "mtime %lld.%09ld -> %lld.%09ld inc\n",
 869                                      ts.tv_sec, ts.tv_nsec,
 870                                      mtime->tv_sec, mtime->tv_nsec);
 871                                 inode_set_mtime_to_ts(inode, *mtime);
 872                         }
 873                         ts = inode_get_atime(inode);
 874                         if (timespec64_compare(atime, &ts) > 0) {
 875                                 doutc(cl, "atime %lld.%09ld -> %lld.%09ld inc\n",
 876                                      ts.tv_sec, ts.tv_nsec,
 877                                      atime->tv_sec, atime->tv_nsec);
 878                                 inode_set_atime_to_ts(inode, *atime);
 879                         }
 880                 } else if (issued & CEPH_CAP_FILE_EXCL) {
 881                         /* we did a utimes(); ignore mds values */
 882                 } else {
 883                         warn = 1;
 884                 }
 885         } else {
 886                 /* we have no write|excl caps; whatever the MDS says is true */
 887                 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) >= 0) {
 888                         inode_set_ctime_to_ts(inode, *ctime);
 889                         inode_set_mtime_to_ts(inode, *mtime);
 890                         inode_set_atime_to_ts(inode, *atime);
 891                         ci->i_time_warp_seq = time_warp_seq;
 892                 } else {
 893                         warn = 1;
 894                 }
 895         }
 896         if (warn) /* time_warp_seq shouldn't go backwards */
 897                 doutc(cl, "%p mds time_warp_seq %llu < %u\n", inode,
 898                       time_warp_seq, ci->i_time_warp_seq);
 899 }
 900
 901 #if IS_ENABLED(CONFIG_FS_ENCRYPTION)
 902 static int decode_encrypted_symlink(struct ceph_mds_client *mdsc,
 903                                     const char *encsym,
 904                                     int enclen, u8 **decsym)
 905 {
 906         struct ceph_client *cl = mdsc->fsc->client;
 907         int declen;
 908         u8 *sym;
 909
 910         sym = kmalloc(enclen + 1, GFP_NOFS);
 911         if (!sym)
 912                 return -ENOMEM;
 913
 914         declen = ceph_base64_decode(encsym, enclen, sym);
 915         if (declen < 0) {
 916                 pr_err_client(cl,
 917                         "can't decode symlink (%d). Content: %.*s\n",
 918                         declen, enclen, encsym);
 919                 kfree(sym);
 920                 return -EIO;
 921         }
 922         sym[declen + 1] = '\0';
 923         *decsym = sym;
 924         return declen;
 925 }
 926 #else
 927 static int decode_encrypted_symlink(struct ceph_mds_client *mdsc,
 928                                     const char *encsym,
 929                                     int symlen, u8 **decsym)
 930 {
 931         return -EOPNOTSUPP;
 932 }
 933 #endif
 934
 935 /*
 936  * Populate an inode based on info from mds.  May be called on new or
 937  * existing inodes.
 938  */
 939 int ceph_fill_inode(struct inode *inode, struct page *locked_page,
 940                     struct ceph_mds_reply_info_in *iinfo,
 941                     struct ceph_mds_reply_dirfrag *dirinfo,
 942                     struct ceph_mds_session *session, int cap_fmode,
 943                     struct ceph_cap_reservation *caps_reservation)
 944 {
 945         struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb);
 946         struct ceph_client *cl = mdsc->fsc->client;
 947         struct ceph_mds_reply_inode *info = iinfo->in;
 948         struct ceph_inode_info *ci = ceph_inode(inode);
 949         int issued, new_issued, info_caps;
 950         struct timespec64 mtime, atime, ctime;
 951         struct ceph_buffer *xattr_blob = NULL;
 952         struct ceph_buffer *old_blob = NULL;
 953         struct ceph_string *pool_ns = NULL;
 954         struct ceph_cap *new_cap = NULL;
 955         int err = 0;
 956         bool wake = false;
 957         bool queue_trunc = false;
 958         bool new_version = false;
 959         bool fill_inline = false;
 960         umode_t mode = le32_to_cpu(info->mode);
 961         dev_t rdev = le32_to_cpu(info->rdev);
 962
 963         lockdep_assert_held(&mdsc->snap_rwsem);
 964
 965         doutc(cl, "%p ino %llx.%llx v %llu had %llu\n", inode, ceph_vinop(inode),
 966               le64_to_cpu(info->version), ci->i_version);
 967
 968         /* Once I_NEW is cleared, we can't change type or dev numbers */
 969         if (inode->i_state & I_NEW) {
 970                 inode->i_mode = mode;
 971         } else {
 972                 if (inode_wrong_type(inode, mode)) {
 973                         pr_warn_once_client(cl,
 974                                 "inode type changed! (ino %llx.%llx is 0%o, mds says 0%o)\n",
 975                                 ceph_vinop(inode), inode->i_mode, mode);
 976                         return -ESTALE;
 977                 }
 978
 979                 if ((S_ISCHR(mode) || S_ISBLK(mode)) && inode->i_rdev != rdev) {
 980                         pr_warn_once_client(cl,
 981                                 "dev inode rdev changed! (ino %llx.%llx is %u:%u, mds says %u:%u)\n",
 982                                 ceph_vinop(inode), MAJOR(inode->i_rdev),
 983                                 MINOR(inode->i_rdev), MAJOR(rdev),
 984                                 MINOR(rdev));
 985                         return -ESTALE;
 986                 }
 987         }
 988
 989         info_caps = le32_to_cpu(info->cap.caps);
 990
 991         /* prealloc new cap struct */
 992         if (info_caps && ceph_snap(inode) == CEPH_NOSNAP) {
 993                 new_cap = ceph_get_cap(mdsc, caps_reservation);
 994                 if (!new_cap)
 995                         return -ENOMEM;
 996         }
 997
 998         /*
 999          * prealloc xattr data, if it looks like we'll need it.  only
1000          * if len > 4 (meaning there are actually xattrs; the first 4
1001          * bytes are the xattr count).
1002          */
1003         if (iinfo->xattr_len > 4) {
1004                 xattr_blob = ceph_buffer_new(iinfo->xattr_len, GFP_NOFS);
1005                 if (!xattr_blob)
1006                         pr_err_client(cl, "ENOMEM xattr blob %d bytes\n",
1007                                       iinfo->xattr_len);
1008         }
1009
1010         if (iinfo->pool_ns_len > 0)
1011                 pool_ns = ceph_find_or_create_string(iinfo->pool_ns_data,
1012                                                      iinfo->pool_ns_len);
1013
1014         if (ceph_snap(inode) != CEPH_NOSNAP && !ci->i_snapid_map)
1015                 ci->i_snapid_map = ceph_get_snapid_map(mdsc, ceph_snap(inode));
1016
1017         spin_lock(&ci->i_ceph_lock);
1018
1019         /*
1020          * provided version will be odd if inode value is projected,
1021          * even if stable.  skip the update if we have newer stable
1022          * info (ours>=theirs, e.g. due to racing mds replies), unless
1023          * we are getting projected (unstable) info (in which case the
1024          * version is odd, and we want ours>theirs).
1025          *   us   them
1026          *   2    2     skip
1027          *   3    2     skip
1028          *   3    3     update
1029          */
1030         if (ci->i_version == 0 ||
1031             ((info->cap.flags & CEPH_CAP_FLAG_AUTH) &&
1032              le64_to_cpu(info->version) > (ci->i_version & ~1)))
1033                 new_version = true;
1034
1035         /* Update change_attribute */
1036         inode_set_max_iversion_raw(inode, iinfo->change_attr);
1037
1038         __ceph_caps_issued(ci, &issued);
1039         issued |= __ceph_caps_dirty(ci);
1040         new_issued = ~issued & info_caps;
1041
1042         __ceph_update_quota(ci, iinfo->max_bytes, iinfo->max_files);
1043
1044 #ifdef CONFIG_FS_ENCRYPTION
1045         if (iinfo->fscrypt_auth_len &&
1046             ((inode->i_state & I_NEW) || (ci->fscrypt_auth_len == 0))) {
1047                 kfree(ci->fscrypt_auth);
1048                 ci->fscrypt_auth_len = iinfo->fscrypt_auth_len;
1049                 ci->fscrypt_auth = iinfo->fscrypt_auth;
1050                 iinfo->fscrypt_auth = NULL;
1051                 iinfo->fscrypt_auth_len = 0;
1052                 inode_set_flags(inode, S_ENCRYPTED, S_ENCRYPTED);
1053         }
1054 #endif
1055
1056         if ((new_version || (new_issued & CEPH_CAP_AUTH_SHARED)) &&
1057             (issued & CEPH_CAP_AUTH_EXCL) == 0) {
1058                 inode->i_mode = mode;
1059                 inode->i_uid = make_kuid(&init_user_ns, le32_to_cpu(info->uid));
1060                 inode->i_gid = make_kgid(&init_user_ns, le32_to_cpu(info->gid));
1061                 doutc(cl, "%p %llx.%llx mode 0%o uid.gid %d.%d\n", inode,
1062                       ceph_vinop(inode), inode->i_mode,
1063                       from_kuid(&init_user_ns, inode->i_uid),
1064                       from_kgid(&init_user_ns, inode->i_gid));
1065                 ceph_decode_timespec64(&ci->i_btime, &iinfo->btime);
1066                 ceph_decode_timespec64(&ci->i_snap_btime, &iinfo->snap_btime);
1067         }
1068
1069         /* directories have fl_stripe_unit set to zero */
1070         if (IS_ENCRYPTED(inode))
1071                 inode->i_blkbits = CEPH_FSCRYPT_BLOCK_SHIFT;
1072         else if (le32_to_cpu(info->layout.fl_stripe_unit))
1073                 inode->i_blkbits =
1074                         fls(le32_to_cpu(info->layout.fl_stripe_unit)) - 1;
1075         else
1076                 inode->i_blkbits = CEPH_BLOCK_SHIFT;
1077
1078         if ((new_version || (new_issued & CEPH_CAP_LINK_SHARED)) &&
1079             (issued & CEPH_CAP_LINK_EXCL) == 0)
1080                 set_nlink(inode, le32_to_cpu(info->nlink));
1081
1082         if (new_version || (new_issued & CEPH_CAP_ANY_RD)) {
1083                 /* be careful with mtime, atime, size */
1084                 ceph_decode_timespec64(&atime, &info->atime);
1085                 ceph_decode_timespec64(&mtime, &info->mtime);
1086                 ceph_decode_timespec64(&ctime, &info->ctime);
1087                 ceph_fill_file_time(inode, issued,
1088                                 le32_to_cpu(info->time_warp_seq),
1089                                 &ctime, &mtime, &atime);
1090         }
1091
1092         if (new_version || (info_caps & CEPH_CAP_FILE_SHARED)) {
1093                 ci->i_files = le64_to_cpu(info->files);
1094                 ci->i_subdirs = le64_to_cpu(info->subdirs);
1095         }
1096
1097         if (new_version ||
1098             (new_issued & (CEPH_CAP_ANY_FILE_RD | CEPH_CAP_ANY_FILE_WR))) {
1099                 u64 size = le64_to_cpu(info->size);
1100                 s64 old_pool = ci->i_layout.pool_id;
1101                 struct ceph_string *old_ns;
1102
1103                 ceph_file_layout_from_legacy(&ci->i_layout, &info->layout);
1104                 old_ns = rcu_dereference_protected(ci->i_layout.pool_ns,
1105                                         lockdep_is_held(&ci->i_ceph_lock));
1106                 rcu_assign_pointer(ci->i_layout.pool_ns, pool_ns);
1107
1108                 if (ci->i_layout.pool_id != old_pool || pool_ns != old_ns)
1109                         ci->i_ceph_flags &= ~CEPH_I_POOL_PERM;
1110
1111                 pool_ns = old_ns;
1112
1113                 if (IS_ENCRYPTED(inode) && size &&
1114                     iinfo->fscrypt_file_len == sizeof(__le64)) {
1115                         u64 fsize = __le64_to_cpu(*(__le64 *)iinfo->fscrypt_file);
1116
1117                         if (size == round_up(fsize, CEPH_FSCRYPT_BLOCK_SIZE)) {
1118                                 size = fsize;
1119                         } else {
1120                                 pr_warn_client(cl,
1121                                         "fscrypt size mismatch: size=%llu fscrypt_file=%llu, discarding fscrypt_file size.\n",
1122                                         info->size, size);
1123                         }
1124                 }
1125
1126                 queue_trunc = ceph_fill_file_size(inode, issued,
1127                                         le32_to_cpu(info->truncate_seq),
1128                                         le64_to_cpu(info->truncate_size),
1129                                         size);
1130                 /* only update max_size on auth cap */
1131                 if ((info->cap.flags & CEPH_CAP_FLAG_AUTH) &&
1132                     ci->i_max_size != le64_to_cpu(info->max_size)) {
1133                         doutc(cl, "max_size %lld -> %llu\n",
1134                             ci->i_max_size, le64_to_cpu(info->max_size));
1135                         ci->i_max_size = le64_to_cpu(info->max_size);
1136                 }
1137         }
1138
1139         /* layout and rstat are not tracked by capability, update them if
1140          * the inode info is from auth mds */
1141         if (new_version || (info->cap.flags & CEPH_CAP_FLAG_AUTH)) {
1142                 if (S_ISDIR(inode->i_mode)) {
1143                         ci->i_dir_layout = iinfo->dir_layout;
1144                         ci->i_rbytes = le64_to_cpu(info->rbytes);
1145                         ci->i_rfiles = le64_to_cpu(info->rfiles);
1146                         ci->i_rsubdirs = le64_to_cpu(info->rsubdirs);
1147                         ci->i_dir_pin = iinfo->dir_pin;
1148                         ci->i_rsnaps = iinfo->rsnaps;
1149                         ceph_decode_timespec64(&ci->i_rctime, &info->rctime);
1150                 }
1151         }
1152
1153         /* xattrs */
1154         /* note that if i_xattrs.len <= 4, i_xattrs.data will still be NULL. */
1155         if ((ci->i_xattrs.version == 0 || !(issued & CEPH_CAP_XATTR_EXCL))  &&
1156             le64_to_cpu(info->xattr_version) > ci->i_xattrs.version) {
1157                 if (ci->i_xattrs.blob)
1158                         old_blob = ci->i_xattrs.blob;
1159                 ci->i_xattrs.blob = xattr_blob;
1160                 if (xattr_blob)
1161                         memcpy(ci->i_xattrs.blob->vec.iov_base,
1162                                iinfo->xattr_data, iinfo->xattr_len);
1163                 ci->i_xattrs.version = le64_to_cpu(info->xattr_version);
1164                 ceph_forget_all_cached_acls(inode);
1165                 ceph_security_invalidate_secctx(inode);
1166                 xattr_blob = NULL;
1167         }
1168
1169         /* finally update i_version */
1170         if (le64_to_cpu(info->version) > ci->i_version)
1171                 ci->i_version = le64_to_cpu(info->version);
1172
1173         inode->i_mapping->a_ops = &ceph_aops;
1174
1175         switch (inode->i_mode & S_IFMT) {
1176         case S_IFIFO:
1177         case S_IFBLK:
1178         case S_IFCHR:
1179         case S_IFSOCK:
1180                 inode->i_blkbits = PAGE_SHIFT;
1181                 init_special_inode(inode, inode->i_mode, rdev);
1182                 inode->i_op = &ceph_file_iops;
1183                 break;
1184         case S_IFREG:
1185                 inode->i_op = &ceph_file_iops;
1186                 inode->i_fop = &ceph_file_fops;
1187                 break;
1188         case S_IFLNK:
1189                 if (!ci->i_symlink) {
1190                         u32 symlen = iinfo->symlink_len;
1191                         char *sym;
1192
1193                         spin_unlock(&ci->i_ceph_lock);
1194
1195                         if (IS_ENCRYPTED(inode)) {
1196                                 if (symlen != i_size_read(inode))
1197                                         pr_err_client(cl,
1198                                                 "%p %llx.%llx BAD symlink size %lld\n",
1199                                                 inode, ceph_vinop(inode),
1200                                                 i_size_read(inode));
1201
1202                                 err = decode_encrypted_symlink(mdsc, iinfo->symlink,
1203                                                                symlen, (u8 **)&sym);
1204                                 if (err < 0) {
1205                                         pr_err_client(cl,
1206                                                 "decoding encrypted symlink failed: %d\n",
1207                                                 err);
1208                                         goto out;
1209                                 }
1210                                 symlen = err;
1211                                 i_size_write(inode, symlen);
1212                                 inode->i_blocks = calc_inode_blocks(symlen);
1213                         } else {
1214                                 if (symlen != i_size_read(inode)) {
1215                                         pr_err_client(cl,
1216                                                 "%p %llx.%llx BAD symlink size %lld\n",
1217                                                 inode, ceph_vinop(inode),
1218                                                 i_size_read(inode));
1219                                         i_size_write(inode, symlen);
1220                                         inode->i_blocks = calc_inode_blocks(symlen);
1221                                 }
1222
1223                                 err = -ENOMEM;
1224                                 sym = kstrndup(iinfo->symlink, symlen, GFP_NOFS);
1225                                 if (!sym)
1226                                         goto out;
1227                         }
1228
1229                         spin_lock(&ci->i_ceph_lock);
1230                         if (!ci->i_symlink)
1231                                 ci->i_symlink = sym;
1232                         else
1233                                 kfree(sym); /* lost a race */
1234                 }
1235
1236                 if (IS_ENCRYPTED(inode)) {
1237                         /*
1238                          * Encrypted symlinks need to be decrypted before we can
1239                          * cache their targets in i_link. Don't touch it here.
1240                          */
1241                         inode->i_op = &ceph_encrypted_symlink_iops;
1242                 } else {
1243                         inode->i_link = ci->i_symlink;
1244                         inode->i_op = &ceph_symlink_iops;
1245                 }
1246                 break;
1247         case S_IFDIR:
1248                 inode->i_op = &ceph_dir_iops;
1249                 inode->i_fop = &ceph_dir_fops;
1250                 break;
1251         default:
1252                 pr_err_client(cl, "%p %llx.%llx BAD mode 0%o\n", inode,
1253                               ceph_vinop(inode), inode->i_mode);
1254         }
1255
1256         /* were we issued a capability? */
1257         if (info_caps) {
1258                 if (ceph_snap(inode) == CEPH_NOSNAP) {
1259                         ceph_add_cap(inode, session,
1260                                      le64_to_cpu(info->cap.cap_id),
1261                                      info_caps,
1262                                      le32_to_cpu(info->cap.wanted),
1263                                      le32_to_cpu(info->cap.seq),
1264                                      le32_to_cpu(info->cap.mseq),
1265                                      le64_to_cpu(info->cap.realm),
1266                                      info->cap.flags, &new_cap);
1267
1268                         /* set dir completion flag? */
1269                         if (S_ISDIR(inode->i_mode) &&
1270                             ci->i_files == 0 && ci->i_subdirs == 0 &&
1271                             (info_caps & CEPH_CAP_FILE_SHARED) &&
1272                             (issued & CEPH_CAP_FILE_EXCL) == 0 &&
1273                             !__ceph_dir_is_complete(ci)) {
1274                                 doutc(cl, " marking %p complete (empty)\n",
1275                                       inode);
1276                                 i_size_write(inode, 0);
1277                                 __ceph_dir_set_complete(ci,
1278                                         atomic64_read(&ci->i_release_count),
1279                                         atomic64_read(&ci->i_ordered_count));
1280                         }
1281
1282                         wake = true;
1283                 } else {
1284                         doutc(cl, " %p got snap_caps %s\n", inode,
1285                               ceph_cap_string(info_caps));
1286                         ci->i_snap_caps |= info_caps;
1287                 }
1288         }
1289
1290         if (iinfo->inline_version > 0 &&
1291             iinfo->inline_version >= ci->i_inline_version) {
1292                 int cache_caps = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO;
1293                 ci->i_inline_version = iinfo->inline_version;
1294                 if (ceph_has_inline_data(ci) &&
1295                     (locked_page || (info_caps & cache_caps)))
1296                         fill_inline = true;
1297         }
1298
1299         if (cap_fmode >= 0) {
1300                 if (!info_caps)
1301                         pr_warn_client(cl, "mds issued no caps on %llx.%llx\n",
1302                                        ceph_vinop(inode));
1303                 __ceph_touch_fmode(ci, mdsc, cap_fmode);
1304         }
1305
1306         spin_unlock(&ci->i_ceph_lock);
1307
1308         ceph_fscache_register_inode_cookie(inode);
1309
1310         if (fill_inline)
1311                 ceph_fill_inline_data(inode, locked_page,
1312                                       iinfo->inline_data, iinfo->inline_len);
1313
1314         if (wake)
1315                 wake_up_all(&ci->i_cap_wq);
1316
1317         /* queue truncate if we saw i_size decrease */
1318         if (queue_trunc)
1319                 ceph_queue_vmtruncate(inode);
1320
1321         /* populate frag tree */
1322         if (S_ISDIR(inode->i_mode))
1323                 ceph_fill_fragtree(inode, &info->fragtree, dirinfo);
1324
1325         /* update delegation info? */
1326         if (dirinfo)
1327                 ceph_fill_dirfrag(inode, dirinfo);
1328
1329         err = 0;
1330 out:
1331         if (new_cap)
1332                 ceph_put_cap(mdsc, new_cap);
1333         ceph_buffer_put(old_blob);
1334         ceph_buffer_put(xattr_blob);
1335         ceph_put_string(pool_ns);
1336         return err;
1337 }
1338
1339 /*
1340  * caller should hold session s_mutex and dentry->d_lock.
1341  */
1342 static void __update_dentry_lease(struct inode *dir, struct dentry *dentry,
1343                                   struct ceph_mds_reply_lease *lease,
1344                                   struct ceph_mds_session *session,
1345                                   unsigned long from_time,
1346                                   struct ceph_mds_session **old_lease_session)
1347 {
1348         struct ceph_client *cl = ceph_inode_to_client(dir);
1349         struct ceph_dentry_info *di = ceph_dentry(dentry);
1350         unsigned mask = le16_to_cpu(lease->mask);
1351         long unsigned duration = le32_to_cpu(lease->duration_ms);
1352         long unsigned ttl = from_time + (duration * HZ) / 1000;
1353         long unsigned half_ttl = from_time + (duration * HZ / 2) / 1000;
1354
1355         doutc(cl, "%p duration %lu ms ttl %lu\n", dentry, duration, ttl);
1356
1357         /* only track leases on regular dentries */
1358         if (ceph_snap(dir) != CEPH_NOSNAP)
1359                 return;
1360
1361         if (mask & CEPH_LEASE_PRIMARY_LINK)
1362                 di->flags |= CEPH_DENTRY_PRIMARY_LINK;
1363         else
1364                 di->flags &= ~CEPH_DENTRY_PRIMARY_LINK;
1365
1366         di->lease_shared_gen = atomic_read(&ceph_inode(dir)->i_shared_gen);
1367         if (!(mask & CEPH_LEASE_VALID)) {
1368                 __ceph_dentry_dir_lease_touch(di);
1369                 return;
1370         }
1371
1372         if (di->lease_gen == atomic_read(&session->s_cap_gen) &&
1373             time_before(ttl, di->time))
1374                 return;  /* we already have a newer lease. */
1375
1376         if (di->lease_session && di->lease_session != session) {
1377                 *old_lease_session = di->lease_session;
1378                 di->lease_session = NULL;
1379         }
1380
1381         if (!di->lease_session)
1382                 di->lease_session = ceph_get_mds_session(session);
1383         di->lease_gen = atomic_read(&session->s_cap_gen);
1384         di->lease_seq = le32_to_cpu(lease->seq);
1385         di->lease_renew_after = half_ttl;
1386         di->lease_renew_from = 0;
1387         di->time = ttl;
1388
1389         __ceph_dentry_lease_touch(di);
1390 }
1391
1392 static inline void update_dentry_lease(struct inode *dir, struct dentry *dentry,
1393                                         struct ceph_mds_reply_lease *lease,
1394                                         struct ceph_mds_session *session,
1395                                         unsigned long from_time)
1396 {
1397         struct ceph_mds_session *old_lease_session = NULL;
1398         spin_lock(&dentry->d_lock);
1399         __update_dentry_lease(dir, dentry, lease, session, from_time,
1400                               &old_lease_session);
1401         spin_unlock(&dentry->d_lock);
1402         ceph_put_mds_session(old_lease_session);
1403 }
1404
1405 /*
1406  * update dentry lease without having parent inode locked
1407  */
1408 static void update_dentry_lease_careful(struct dentry *dentry,
1409                                         struct ceph_mds_reply_lease *lease,
1410                                         struct ceph_mds_session *session,
1411                                         unsigned long from_time,
1412                                         char *dname, u32 dname_len,
1413                                         struct ceph_vino *pdvino,
1414                                         struct ceph_vino *ptvino)
1415
1416 {
1417         struct inode *dir;
1418         struct ceph_mds_session *old_lease_session = NULL;
1419
1420         spin_lock(&dentry->d_lock);
1421         /* make sure dentry's name matches target */
1422         if (dentry->d_name.len != dname_len ||
1423             memcmp(dentry->d_name.name, dname, dname_len))
1424                 goto out_unlock;
1425
1426         dir = d_inode(dentry->d_parent);
1427         /* make sure parent matches dvino */
1428         if (!ceph_ino_compare(dir, pdvino))
1429                 goto out_unlock;
1430
1431         /* make sure dentry's inode matches target. NULL ptvino means that
1432          * we expect a negative dentry */
1433         if (ptvino) {
1434                 if (d_really_is_negative(dentry))
1435                         goto out_unlock;
1436                 if (!ceph_ino_compare(d_inode(dentry), ptvino))
1437                         goto out_unlock;
1438         } else {
1439                 if (d_really_is_positive(dentry))
1440                         goto out_unlock;
1441         }
1442
1443         __update_dentry_lease(dir, dentry, lease, session,
1444                               from_time, &old_lease_session);
1445 out_unlock:
1446         spin_unlock(&dentry->d_lock);
1447         ceph_put_mds_session(old_lease_session);
1448 }
1449
1450 /*
1451  * splice a dentry to an inode.
1452  * caller must hold directory i_rwsem for this to be safe.
1453  */
1454 static int splice_dentry(struct dentry **pdn, struct inode *in)
1455 {
1456         struct ceph_client *cl = ceph_inode_to_client(in);
1457         struct dentry *dn = *pdn;
1458         struct dentry *realdn;
1459
1460         BUG_ON(d_inode(dn));
1461
1462         if (S_ISDIR(in->i_mode)) {
1463                 /* If inode is directory, d_splice_alias() below will remove
1464                  * 'realdn' from its origin parent. We need to ensure that
1465                  * origin parent's readdir cache will not reference 'realdn'
1466                  */
1467                 realdn = d_find_any_alias(in);
1468                 if (realdn) {
1469                         struct ceph_dentry_info *di = ceph_dentry(realdn);
1470                         spin_lock(&realdn->d_lock);
1471
1472                         realdn->d_op->d_prune(realdn);
1473
1474                         di->time = jiffies;
1475                         di->lease_shared_gen = 0;
1476                         di->offset = 0;
1477
1478                         spin_unlock(&realdn->d_lock);
1479                         dput(realdn);
1480                 }
1481         }
1482
1483         /* dn must be unhashed */
1484         if (!d_unhashed(dn))
1485                 d_drop(dn);
1486         realdn = d_splice_alias(in, dn);
1487         if (IS_ERR(realdn)) {
1488                 pr_err_client(cl, "error %ld %p inode %p ino %llx.%llx\n",
1489                               PTR_ERR(realdn), dn, in, ceph_vinop(in));
1490                 return PTR_ERR(realdn);
1491         }
1492
1493         if (realdn) {
1494                 doutc(cl, "dn %p (%d) spliced with %p (%d) inode %p ino %llx.%llx\n",
1495                       dn, d_count(dn), realdn, d_count(realdn),
1496                       d_inode(realdn), ceph_vinop(d_inode(realdn)));
1497                 dput(dn);
1498                 *pdn = realdn;
1499         } else {
1500                 BUG_ON(!ceph_dentry(dn));
1501                 doutc(cl, "dn %p attached to %p ino %llx.%llx\n", dn,
1502                       d_inode(dn), ceph_vinop(d_inode(dn)));
1503         }
1504         return 0;
1505 }
1506
1507 /*
1508  * Incorporate results into the local cache.  This is either just
1509  * one inode, or a directory, dentry, and possibly linked-to inode (e.g.,
1510  * after a lookup).
1511  *
1512  * A reply may contain
1513  *         a directory inode along with a dentry.
1514  *  and/or a target inode
1515  *
1516  * Called with snap_rwsem (read).
1517  */
1518 int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req)
1519 {
1520         struct ceph_mds_session *session = req->r_session;
1521         struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1522         struct inode *in = NULL;
1523         struct ceph_vino tvino, dvino;
1524         struct ceph_fs_client *fsc = ceph_sb_to_fs_client(sb);
1525         struct ceph_client *cl = fsc->client;
1526         int err = 0;
1527
1528         doutc(cl, "%p is_dentry %d is_target %d\n", req,
1529               rinfo->head->is_dentry, rinfo->head->is_target);
1530
1531         if (!rinfo->head->is_target && !rinfo->head->is_dentry) {
1532                 doutc(cl, "reply is empty!\n");
1533                 if (rinfo->head->result == 0 && req->r_parent)
1534                         ceph_invalidate_dir_request(req);
1535                 return 0;
1536         }
1537
1538         if (rinfo->head->is_dentry) {
1539                 struct inode *dir = req->r_parent;
1540
1541                 if (dir) {
1542                         err = ceph_fill_inode(dir, NULL, &rinfo->diri,
1543                                               rinfo->dirfrag, session, -1,
1544                                               &req->r_caps_reservation);
1545                         if (err < 0)
1546                                 goto done;
1547                 } else {
1548                         WARN_ON_ONCE(1);
1549                 }
1550
1551                 if (dir && req->r_op == CEPH_MDS_OP_LOOKUPNAME &&
1552                     test_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags) &&
1553                     !test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
1554                         bool is_nokey = false;
1555                         struct qstr dname;
1556                         struct dentry *dn, *parent;
1557                         struct fscrypt_str oname = FSTR_INIT(NULL, 0);
1558                         struct ceph_fname fname = { .dir        = dir,
1559                                                     .name       = rinfo->dname,
1560                                                     .ctext      = rinfo->altname,
1561                                                     .name_len   = rinfo->dname_len,
1562                                                     .ctext_len  = rinfo->altname_len };
1563
1564                         BUG_ON(!rinfo->head->is_target);
1565                         BUG_ON(req->r_dentry);
1566
1567                         parent = d_find_any_alias(dir);
1568                         BUG_ON(!parent);
1569
1570                         err = ceph_fname_alloc_buffer(dir, &oname);
1571                         if (err < 0) {
1572                                 dput(parent);
1573                                 goto done;
1574                         }
1575
1576                         err = ceph_fname_to_usr(&fname, NULL, &oname, &is_nokey);
1577                         if (err < 0) {
1578                                 dput(parent);
1579                                 ceph_fname_free_buffer(dir, &oname);
1580                                 goto done;
1581                         }
1582                         dname.name = oname.name;
1583                         dname.len = oname.len;
1584                         dname.hash = full_name_hash(parent, dname.name, dname.len);
1585                         tvino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1586                         tvino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1587 retry_lookup:
1588                         dn = d_lookup(parent, &dname);
1589                         doutc(cl, "d_lookup on parent=%p name=%.*s got %p\n",
1590                               parent, dname.len, dname.name, dn);
1591
1592                         if (!dn) {
1593                                 dn = d_alloc(parent, &dname);
1594                                 doutc(cl, "d_alloc %p '%.*s' = %p\n", parent,
1595                                       dname.len, dname.name, dn);
1596                                 if (!dn) {
1597                                         dput(parent);
1598                                         ceph_fname_free_buffer(dir, &oname);
1599                                         err = -ENOMEM;
1600                                         goto done;
1601                                 }
1602                                 if (is_nokey) {
1603                                         spin_lock(&dn->d_lock);
1604                                         dn->d_flags |= DCACHE_NOKEY_NAME;
1605                                         spin_unlock(&dn->d_lock);
1606                                 }
1607                                 err = 0;
1608                         } else if (d_really_is_positive(dn) &&
1609                                    (ceph_ino(d_inode(dn)) != tvino.ino ||
1610                                     ceph_snap(d_inode(dn)) != tvino.snap)) {
1611                                 doutc(cl, " dn %p points to wrong inode %p\n",
1612                                       dn, d_inode(dn));
1613                                 ceph_dir_clear_ordered(dir);
1614                                 d_delete(dn);
1615                                 dput(dn);
1616                                 goto retry_lookup;
1617                         }
1618                         ceph_fname_free_buffer(dir, &oname);
1619
1620                         req->r_dentry = dn;
1621                         dput(parent);
1622                 }
1623         }
1624
1625         if (rinfo->head->is_target) {
1626                 /* Should be filled in by handle_reply */
1627                 BUG_ON(!req->r_target_inode);
1628
1629                 in = req->r_target_inode;
1630                 err = ceph_fill_inode(in, req->r_locked_page, &rinfo->targeti,
1631                                 NULL, session,
1632                                 (!test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags) &&
1633                                  !test_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags) &&
1634                                  rinfo->head->result == 0) ?  req->r_fmode : -1,
1635                                 &req->r_caps_reservation);
1636                 if (err < 0) {
1637                         pr_err_client(cl, "badness %p %llx.%llx\n", in,
1638                                       ceph_vinop(in));
1639                         req->r_target_inode = NULL;
1640                         if (in->i_state & I_NEW)
1641                                 discard_new_inode(in);
1642                         else
1643                                 iput(in);
1644                         goto done;
1645                 }
1646                 if (in->i_state & I_NEW)
1647                         unlock_new_inode(in);
1648         }
1649
1650         /*
1651          * ignore null lease/binding on snapdir ENOENT, or else we
1652          * will have trouble splicing in the virtual snapdir later
1653          */
1654         if (rinfo->head->is_dentry &&
1655             !test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags) &&
1656             test_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags) &&
1657             (rinfo->head->is_target || strncmp(req->r_dentry->d_name.name,
1658                                                fsc->mount_options->snapdir_name,
1659                                                req->r_dentry->d_name.len))) {
1660                 /*
1661                  * lookup link rename   : null -> possibly existing inode
1662                  * mknod symlink mkdir  : null -> new inode
1663                  * unlink               : linked -> null
1664                  */
1665                 struct inode *dir = req->r_parent;
1666                 struct dentry *dn = req->r_dentry;
1667                 bool have_dir_cap, have_lease;
1668
1669                 BUG_ON(!dn);
1670                 BUG_ON(!dir);
1671                 BUG_ON(d_inode(dn->d_parent) != dir);
1672
1673                 dvino.ino = le64_to_cpu(rinfo->diri.in->ino);
1674                 dvino.snap = le64_to_cpu(rinfo->diri.in->snapid);
1675
1676                 BUG_ON(ceph_ino(dir) != dvino.ino);
1677                 BUG_ON(ceph_snap(dir) != dvino.snap);
1678
1679                 /* do we have a lease on the whole dir? */
1680                 have_dir_cap =
1681                         (le32_to_cpu(rinfo->diri.in->cap.caps) &
1682                          CEPH_CAP_FILE_SHARED);
1683
1684                 /* do we have a dn lease? */
1685                 have_lease = have_dir_cap ||
1686                         le32_to_cpu(rinfo->dlease->duration_ms);
1687                 if (!have_lease)
1688                         doutc(cl, "no dentry lease or dir cap\n");
1689
1690                 /* rename? */
1691                 if (req->r_old_dentry && req->r_op == CEPH_MDS_OP_RENAME) {
1692                         struct inode *olddir = req->r_old_dentry_dir;
1693                         BUG_ON(!olddir);
1694
1695                         doutc(cl, " src %p '%pd' dst %p '%pd'\n",
1696                               req->r_old_dentry, req->r_old_dentry, dn, dn);
1697                         doutc(cl, "doing d_move %p -> %p\n", req->r_old_dentry, dn);
1698
1699                         /* d_move screws up sibling dentries' offsets */
1700                         ceph_dir_clear_ordered(dir);
1701                         ceph_dir_clear_ordered(olddir);
1702
1703                         d_move(req->r_old_dentry, dn);
1704                         doutc(cl, " src %p '%pd' dst %p '%pd'\n",
1705                               req->r_old_dentry, req->r_old_dentry, dn, dn);
1706
1707                         /* ensure target dentry is invalidated, despite
1708                            rehashing bug in vfs_rename_dir */
1709                         ceph_invalidate_dentry_lease(dn);
1710
1711                         doutc(cl, "dn %p gets new offset %lld\n",
1712                               req->r_old_dentry,
1713                               ceph_dentry(req->r_old_dentry)->offset);
1714
1715                         /* swap r_dentry and r_old_dentry in case that
1716                          * splice_dentry() gets called later. This is safe
1717                          * because no other place will use them */
1718                         req->r_dentry = req->r_old_dentry;
1719                         req->r_old_dentry = dn;
1720                         dn = req->r_dentry;
1721                 }
1722
1723                 /* null dentry? */
1724                 if (!rinfo->head->is_target) {
1725                         doutc(cl, "null dentry\n");
1726                         if (d_really_is_positive(dn)) {
1727                                 doutc(cl, "d_delete %p\n", dn);
1728                                 ceph_dir_clear_ordered(dir);
1729                                 d_delete(dn);
1730                         } else if (have_lease) {
1731                                 if (d_unhashed(dn))
1732                                         d_add(dn, NULL);
1733                         }
1734
1735                         if (!d_unhashed(dn) && have_lease)
1736                                 update_dentry_lease(dir, dn,
1737                                                     rinfo->dlease, session,
1738                                                     req->r_request_started);
1739                         goto done;
1740                 }
1741
1742                 /* attach proper inode */
1743                 if (d_really_is_negative(dn)) {
1744                         ceph_dir_clear_ordered(dir);
1745                         ihold(in);
1746                         err = splice_dentry(&req->r_dentry, in);
1747                         if (err < 0)
1748                                 goto done;
1749                         dn = req->r_dentry;  /* may have spliced */
1750                 } else if (d_really_is_positive(dn) && d_inode(dn) != in) {
1751                         doutc(cl, " %p links to %p %llx.%llx, not %llx.%llx\n",
1752                               dn, d_inode(dn), ceph_vinop(d_inode(dn)),
1753                               ceph_vinop(in));
1754                         d_invalidate(dn);
1755                         have_lease = false;
1756                 }
1757
1758                 if (have_lease) {
1759                         update_dentry_lease(dir, dn,
1760                                             rinfo->dlease, session,
1761                                             req->r_request_started);
1762                 }
1763                 doutc(cl, " final dn %p\n", dn);
1764         } else if ((req->r_op == CEPH_MDS_OP_LOOKUPSNAP ||
1765                     req->r_op == CEPH_MDS_OP_MKSNAP) &&
1766                    test_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags) &&
1767                    !test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
1768                 struct inode *dir = req->r_parent;
1769
1770                 /* fill out a snapdir LOOKUPSNAP dentry */
1771                 BUG_ON(!dir);
1772                 BUG_ON(ceph_snap(dir) != CEPH_SNAPDIR);
1773                 BUG_ON(!req->r_dentry);
1774                 doutc(cl, " linking snapped dir %p to dn %p\n", in,
1775                       req->r_dentry);
1776                 ceph_dir_clear_ordered(dir);
1777                 ihold(in);
1778                 err = splice_dentry(&req->r_dentry, in);
1779                 if (err < 0)
1780                         goto done;
1781         } else if (rinfo->head->is_dentry && req->r_dentry) {
1782                 /* parent inode is not locked, be carefull */
1783                 struct ceph_vino *ptvino = NULL;
1784                 dvino.ino = le64_to_cpu(rinfo->diri.in->ino);
1785                 dvino.snap = le64_to_cpu(rinfo->diri.in->snapid);
1786                 if (rinfo->head->is_target) {
1787                         tvino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1788                         tvino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1789                         ptvino = &tvino;
1790                 }
1791                 update_dentry_lease_careful(req->r_dentry, rinfo->dlease,
1792                                             session, req->r_request_started,
1793                                             rinfo->dname, rinfo->dname_len,
1794                                             &dvino, ptvino);
1795         }
1796 done:
1797         doutc(cl, "done err=%d\n", err);
1798         return err;
1799 }
1800
1801 /*
1802  * Prepopulate our cache with readdir results, leases, etc.
1803  */
1804 static int readdir_prepopulate_inodes_only(struct ceph_mds_request *req,
1805                                            struct ceph_mds_session *session)
1806 {
1807         struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1808         struct ceph_client *cl = session->s_mdsc->fsc->client;
1809         int i, err = 0;
1810
1811         for (i = 0; i < rinfo->dir_nr; i++) {
1812                 struct ceph_mds_reply_dir_entry *rde = rinfo->dir_entries + i;
1813                 struct ceph_vino vino;
1814                 struct inode *in;
1815                 int rc;
1816
1817                 vino.ino = le64_to_cpu(rde->inode.in->ino);
1818                 vino.snap = le64_to_cpu(rde->inode.in->snapid);
1819
1820                 in = ceph_get_inode(req->r_dentry->d_sb, vino, NULL);
1821                 if (IS_ERR(in)) {
1822                         err = PTR_ERR(in);
1823                         doutc(cl, "badness got %d\n", err);
1824                         continue;
1825                 }
1826                 rc = ceph_fill_inode(in, NULL, &rde->inode, NULL, session,
1827                                      -1, &req->r_caps_reservation);
1828                 if (rc < 0) {
1829                         pr_err_client(cl, "inode badness on %p got %d\n", in,
1830                                       rc);
1831                         err = rc;
1832                         if (in->i_state & I_NEW) {
1833                                 ihold(in);
1834                                 discard_new_inode(in);
1835                         }
1836                 } else if (in->i_state & I_NEW) {
1837                         unlock_new_inode(in);
1838                 }
1839
1840                 iput(in);
1841         }
1842
1843         return err;
1844 }
1845
1846 void ceph_readdir_cache_release(struct ceph_readdir_cache_control *ctl)
1847 {
1848         if (ctl->page) {
1849                 kunmap(ctl->page);
1850                 put_page(ctl->page);
1851                 ctl->page = NULL;
1852         }
1853 }
1854
1855 static int fill_readdir_cache(struct inode *dir, struct dentry *dn,
1856                               struct ceph_readdir_cache_control *ctl,
1857                               struct ceph_mds_request *req)
1858 {
1859         struct ceph_client *cl = ceph_inode_to_client(dir);
1860         struct ceph_inode_info *ci = ceph_inode(dir);
1861         unsigned nsize = PAGE_SIZE / sizeof(struct dentry*);
1862         unsigned idx = ctl->index % nsize;
1863         pgoff_t pgoff = ctl->index / nsize;
1864
1865         if (!ctl->page || pgoff != ctl->page->index) {
1866                 ceph_readdir_cache_release(ctl);
1867                 if (idx == 0)
1868                         ctl->page = grab_cache_page(&dir->i_data, pgoff);
1869                 else
1870                         ctl->page = find_lock_page(&dir->i_data, pgoff);
1871                 if (!ctl->page) {
1872                         ctl->index = -1;
1873                         return idx == 0 ? -ENOMEM : 0;
1874                 }
1875                 /* reading/filling the cache are serialized by
1876                  * i_rwsem, no need to use page lock */
1877                 unlock_page(ctl->page);
1878                 ctl->dentries = kmap(ctl->page);
1879                 if (idx == 0)
1880                         memset(ctl->dentries, 0, PAGE_SIZE);
1881         }
1882
1883         if (req->r_dir_release_cnt == atomic64_read(&ci->i_release_count) &&
1884             req->r_dir_ordered_cnt == atomic64_read(&ci->i_ordered_count)) {
1885                 doutc(cl, "dn %p idx %d\n", dn, ctl->index);
1886                 ctl->dentries[idx] = dn;
1887                 ctl->index++;
1888         } else {
1889                 doutc(cl, "disable readdir cache\n");
1890                 ctl->index = -1;
1891         }
1892         return 0;
1893 }
1894
1895 int ceph_readdir_prepopulate(struct ceph_mds_request *req,
1896                              struct ceph_mds_session *session)
1897 {
1898         struct dentry *parent = req->r_dentry;
1899         struct inode *inode = d_inode(parent);
1900         struct ceph_inode_info *ci = ceph_inode(inode);
1901         struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1902         struct ceph_client *cl = session->s_mdsc->fsc->client;
1903         struct qstr dname;
1904         struct dentry *dn;
1905         struct inode *in;
1906         int err = 0, skipped = 0, ret, i;
1907         u32 frag = le32_to_cpu(req->r_args.readdir.frag);
1908         u32 last_hash = 0;
1909         u32 fpos_offset;
1910         struct ceph_readdir_cache_control cache_ctl = {};
1911
1912         if (test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags))
1913                 return readdir_prepopulate_inodes_only(req, session);
1914
1915         if (rinfo->hash_order) {
1916                 if (req->r_path2) {
1917                         last_hash = ceph_str_hash(ci->i_dir_layout.dl_dir_hash,
1918                                                   req->r_path2,
1919                                                   strlen(req->r_path2));
1920                         last_hash = ceph_frag_value(last_hash);
1921                 } else if (rinfo->offset_hash) {
1922                         /* mds understands offset_hash */
1923                         WARN_ON_ONCE(req->r_readdir_offset != 2);
1924                         last_hash = le32_to_cpu(req->r_args.readdir.offset_hash);
1925                 }
1926         }
1927
1928         if (rinfo->dir_dir &&
1929             le32_to_cpu(rinfo->dir_dir->frag) != frag) {
1930                 doutc(cl, "got new frag %x -> %x\n", frag,
1931                             le32_to_cpu(rinfo->dir_dir->frag));
1932                 frag = le32_to_cpu(rinfo->dir_dir->frag);
1933                 if (!rinfo->hash_order)
1934                         req->r_readdir_offset = 2;
1935         }
1936
1937         if (le32_to_cpu(rinfo->head->op) == CEPH_MDS_OP_LSSNAP) {
1938                 doutc(cl, "%d items under SNAPDIR dn %p\n",
1939                       rinfo->dir_nr, parent);
1940         } else {
1941                 doutc(cl, "%d items under dn %p\n", rinfo->dir_nr, parent);
1942                 if (rinfo->dir_dir)
1943                         ceph_fill_dirfrag(d_inode(parent), rinfo->dir_dir);
1944
1945                 if (ceph_frag_is_leftmost(frag) &&
1946                     req->r_readdir_offset == 2 &&
1947                     !(rinfo->hash_order && last_hash)) {
1948                         /* note dir version at start of readdir so we can
1949                          * tell if any dentries get dropped */
1950                         req->r_dir_release_cnt =
1951                                 atomic64_read(&ci->i_release_count);
1952                         req->r_dir_ordered_cnt =
1953                                 atomic64_read(&ci->i_ordered_count);
1954                         req->r_readdir_cache_idx = 0;
1955                 }
1956         }
1957
1958         cache_ctl.index = req->r_readdir_cache_idx;
1959         fpos_offset = req->r_readdir_offset;
1960
1961         /* FIXME: release caps/leases if error occurs */
1962         for (i = 0; i < rinfo->dir_nr; i++) {
1963                 struct ceph_mds_reply_dir_entry *rde = rinfo->dir_entries + i;
1964                 struct ceph_vino tvino;
1965
1966                 dname.name = rde->name;
1967                 dname.len = rde->name_len;
1968                 dname.hash = full_name_hash(parent, dname.name, dname.len);
1969
1970                 tvino.ino = le64_to_cpu(rde->inode.in->ino);
1971                 tvino.snap = le64_to_cpu(rde->inode.in->snapid);
1972
1973                 if (rinfo->hash_order) {
1974                         u32 hash = ceph_frag_value(rde->raw_hash);
1975                         if (hash != last_hash)
1976                                 fpos_offset = 2;
1977                         last_hash = hash;
1978                         rde->offset = ceph_make_fpos(hash, fpos_offset++, true);
1979                 } else {
1980                         rde->offset = ceph_make_fpos(frag, fpos_offset++, false);
1981                 }
1982
1983 retry_lookup:
1984                 dn = d_lookup(parent, &dname);
1985                 doutc(cl, "d_lookup on parent=%p name=%.*s got %p\n",
1986                       parent, dname.len, dname.name, dn);
1987
1988                 if (!dn) {
1989                         dn = d_alloc(parent, &dname);
1990                         doutc(cl, "d_alloc %p '%.*s' = %p\n", parent,
1991                               dname.len, dname.name, dn);
1992                         if (!dn) {
1993                                 doutc(cl, "d_alloc badness\n");
1994                                 err = -ENOMEM;
1995                                 goto out;
1996                         }
1997                         if (rde->is_nokey) {
1998                                 spin_lock(&dn->d_lock);
1999                                 dn->d_flags |= DCACHE_NOKEY_NAME;
2000                                 spin_unlock(&dn->d_lock);
2001                         }
2002                 } else if (d_really_is_positive(dn) &&
2003                            (ceph_ino(d_inode(dn)) != tvino.ino ||
2004                             ceph_snap(d_inode(dn)) != tvino.snap)) {
2005                         struct ceph_dentry_info *di = ceph_dentry(dn);
2006                         doutc(cl, " dn %p points to wrong inode %p\n",
2007                               dn, d_inode(dn));
2008
2009                         spin_lock(&dn->d_lock);
2010                         if (di->offset > 0 &&
2011                             di->lease_shared_gen ==
2012                             atomic_read(&ci->i_shared_gen)) {
2013                                 __ceph_dir_clear_ordered(ci);
2014                                 di->offset = 0;
2015                         }
2016                         spin_unlock(&dn->d_lock);
2017
2018                         d_delete(dn);
2019                         dput(dn);
2020                         goto retry_lookup;
2021                 }
2022
2023                 /* inode */
2024                 if (d_really_is_positive(dn)) {
2025                         in = d_inode(dn);
2026                 } else {
2027                         in = ceph_get_inode(parent->d_sb, tvino, NULL);
2028                         if (IS_ERR(in)) {
2029                                 doutc(cl, "new_inode badness\n");
2030                                 d_drop(dn);
2031                                 dput(dn);
2032                                 err = PTR_ERR(in);
2033                                 goto out;
2034                         }
2035                 }
2036
2037                 ret = ceph_fill_inode(in, NULL, &rde->inode, NULL, session,
2038                                       -1, &req->r_caps_reservation);
2039                 if (ret < 0) {
2040                         pr_err_client(cl, "badness on %p %llx.%llx\n", in,
2041                                       ceph_vinop(in));
2042                         if (d_really_is_negative(dn)) {
2043                                 if (in->i_state & I_NEW) {
2044                                         ihold(in);
2045                                         discard_new_inode(in);
2046                                 }
2047                                 iput(in);
2048                         }
2049                         d_drop(dn);
2050                         err = ret;
2051                         goto next_item;
2052                 }
2053                 if (in->i_state & I_NEW)
2054                         unlock_new_inode(in);
2055
2056                 if (d_really_is_negative(dn)) {
2057                         if (ceph_security_xattr_deadlock(in)) {
2058                                 doutc(cl, " skip splicing dn %p to inode %p"
2059                                       " (security xattr deadlock)\n", dn, in);
2060                                 iput(in);
2061                                 skipped++;
2062                                 goto next_item;
2063                         }
2064
2065                         err = splice_dentry(&dn, in);
2066                         if (err < 0)
2067                                 goto next_item;
2068                 }
2069
2070                 ceph_dentry(dn)->offset = rde->offset;
2071
2072                 update_dentry_lease(d_inode(parent), dn,
2073                                     rde->lease, req->r_session,
2074                                     req->r_request_started);
2075
2076                 if (err == 0 && skipped == 0 && cache_ctl.index >= 0) {
2077                         ret = fill_readdir_cache(d_inode(parent), dn,
2078                                                  &cache_ctl, req);
2079                         if (ret < 0)
2080                                 err = ret;
2081                 }
2082 next_item:
2083                 dput(dn);
2084         }
2085 out:
2086         if (err == 0 && skipped == 0) {
2087                 set_bit(CEPH_MDS_R_DID_PREPOPULATE, &req->r_req_flags);
2088                 req->r_readdir_cache_idx = cache_ctl.index;
2089         }
2090         ceph_readdir_cache_release(&cache_ctl);
2091         doutc(cl, "done\n");
2092         return err;
2093 }
2094
2095 bool ceph_inode_set_size(struct inode *inode, loff_t size)
2096 {
2097         struct ceph_client *cl = ceph_inode_to_client(inode);
2098         struct ceph_inode_info *ci = ceph_inode(inode);
2099         bool ret;
2100
2101         spin_lock(&ci->i_ceph_lock);
2102         doutc(cl, "set_size %p %llu -> %llu\n", inode, i_size_read(inode), size);
2103         i_size_write(inode, size);
2104         ceph_fscache_update(inode);
2105         inode->i_blocks = calc_inode_blocks(size);
2106
2107         ret = __ceph_should_report_size(ci);
2108
2109         spin_unlock(&ci->i_ceph_lock);
2110
2111         return ret;
2112 }
2113
2114 void ceph_queue_inode_work(struct inode *inode, int work_bit)
2115 {
2116         struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);
2117         struct ceph_client *cl = fsc->client;
2118         struct ceph_inode_info *ci = ceph_inode(inode);
2119         set_bit(work_bit, &ci->i_work_mask);
2120
2121         ihold(inode);
2122         if (queue_work(fsc->inode_wq, &ci->i_work)) {
2123                 doutc(cl, "%p %llx.%llx mask=%lx\n", inode,
2124                       ceph_vinop(inode), ci->i_work_mask);
2125         } else {
2126                 doutc(cl, "%p %llx.%llx already queued, mask=%lx\n",
2127                       inode, ceph_vinop(inode), ci->i_work_mask);
2128                 iput(inode);
2129         }
2130 }
2131
2132 static void ceph_do_invalidate_pages(struct inode *inode)
2133 {
2134         struct ceph_client *cl = ceph_inode_to_client(inode);
2135         struct ceph_inode_info *ci = ceph_inode(inode);
2136         u32 orig_gen;
2137         int check = 0;
2138
2139         ceph_fscache_invalidate(inode, false);
2140
2141         mutex_lock(&ci->i_truncate_mutex);
2142
2143         if (ceph_inode_is_shutdown(inode)) {
2144                 pr_warn_ratelimited_client(cl,
2145                         "%p %llx.%llx is shut down\n", inode,
2146                         ceph_vinop(inode));
2147                 mapping_set_error(inode->i_mapping, -EIO);
2148                 truncate_pagecache(inode, 0);
2149                 mutex_unlock(&ci->i_truncate_mutex);
2150                 goto out;
2151         }
2152
2153         spin_lock(&ci->i_ceph_lock);
2154         doutc(cl, "%p %llx.%llx gen %d revoking %d\n", inode,
2155               ceph_vinop(inode), ci->i_rdcache_gen, ci->i_rdcache_revoking);
2156         if (ci->i_rdcache_revoking != ci->i_rdcache_gen) {
2157                 if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE))
2158                         check = 1;
2159                 spin_unlock(&ci->i_ceph_lock);
2160                 mutex_unlock(&ci->i_truncate_mutex);
2161                 goto out;
2162         }
2163         orig_gen = ci->i_rdcache_gen;
2164         spin_unlock(&ci->i_ceph_lock);
2165
2166         if (invalidate_inode_pages2(inode->i_mapping) < 0) {
2167                 pr_err_client(cl, "invalidate_inode_pages2 %llx.%llx failed\n",
2168                               ceph_vinop(inode));
2169         }
2170
2171         spin_lock(&ci->i_ceph_lock);
2172         if (orig_gen == ci->i_rdcache_gen &&
2173             orig_gen == ci->i_rdcache_revoking) {
2174                 doutc(cl, "%p %llx.%llx gen %d successful\n", inode,
2175                       ceph_vinop(inode), ci->i_rdcache_gen);
2176                 ci->i_rdcache_revoking--;
2177                 check = 1;
2178         } else {
2179                 doutc(cl, "%p %llx.%llx gen %d raced, now %d revoking %d\n",
2180                       inode, ceph_vinop(inode), orig_gen, ci->i_rdcache_gen,
2181                       ci->i_rdcache_revoking);
2182                 if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE))
2183                         check = 1;
2184         }
2185         spin_unlock(&ci->i_ceph_lock);
2186         mutex_unlock(&ci->i_truncate_mutex);
2187 out:
2188         if (check)
2189                 ceph_check_caps(ci, 0);
2190 }
2191
2192 /*
2193  * Make sure any pending truncation is applied before doing anything
2194  * that may depend on it.
2195  */
2196 void __ceph_do_pending_vmtruncate(struct inode *inode)
2197 {
2198         struct ceph_client *cl = ceph_inode_to_client(inode);
2199         struct ceph_inode_info *ci = ceph_inode(inode);
2200         u64 to;
2201         int wrbuffer_refs, finish = 0;
2202
2203         mutex_lock(&ci->i_truncate_mutex);
2204 retry:
2205         spin_lock(&ci->i_ceph_lock);
2206         if (ci->i_truncate_pending == 0) {
2207                 doutc(cl, "%p %llx.%llx none pending\n", inode,
2208                       ceph_vinop(inode));
2209                 spin_unlock(&ci->i_ceph_lock);
2210                 mutex_unlock(&ci->i_truncate_mutex);
2211                 return;
2212         }
2213
2214         /*
2215          * make sure any dirty snapped pages are flushed before we
2216          * possibly truncate them.. so write AND block!
2217          */
2218         if (ci->i_wrbuffer_ref_head < ci->i_wrbuffer_ref) {
2219                 spin_unlock(&ci->i_ceph_lock);
2220                 doutc(cl, "%p %llx.%llx flushing snaps first\n", inode,
2221                       ceph_vinop(inode));
2222                 filemap_write_and_wait_range(&inode->i_data, 0,
2223                                              inode->i_sb->s_maxbytes);
2224                 goto retry;
2225         }
2226
2227         /* there should be no reader or writer */
2228         WARN_ON_ONCE(ci->i_rd_ref || ci->i_wr_ref);
2229
2230         to = ci->i_truncate_pagecache_size;
2231         wrbuffer_refs = ci->i_wrbuffer_ref;
2232         doutc(cl, "%p %llx.%llx (%d) to %lld\n", inode, ceph_vinop(inode),
2233               ci->i_truncate_pending, to);
2234         spin_unlock(&ci->i_ceph_lock);
2235
2236         ceph_fscache_resize(inode, to);
2237         truncate_pagecache(inode, to);
2238
2239         spin_lock(&ci->i_ceph_lock);
2240         if (to == ci->i_truncate_pagecache_size) {
2241                 ci->i_truncate_pending = 0;
2242                 finish = 1;
2243         }
2244         spin_unlock(&ci->i_ceph_lock);
2245         if (!finish)
2246                 goto retry;
2247
2248         mutex_unlock(&ci->i_truncate_mutex);
2249
2250         if (wrbuffer_refs == 0)
2251                 ceph_check_caps(ci, 0);
2252
2253         wake_up_all(&ci->i_cap_wq);
2254 }
2255
2256 static void ceph_inode_work(struct work_struct *work)
2257 {
2258         struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
2259                                                  i_work);
2260         struct inode *inode = &ci->netfs.inode;
2261         struct ceph_client *cl = ceph_inode_to_client(inode);
2262
2263         if (test_and_clear_bit(CEPH_I_WORK_WRITEBACK, &ci->i_work_mask)) {
2264                 doutc(cl, "writeback %p %llx.%llx\n", inode, ceph_vinop(inode));
2265                 filemap_fdatawrite(&inode->i_data);
2266         }
2267         if (test_and_clear_bit(CEPH_I_WORK_INVALIDATE_PAGES, &ci->i_work_mask))
2268                 ceph_do_invalidate_pages(inode);
2269
2270         if (test_and_clear_bit(CEPH_I_WORK_VMTRUNCATE, &ci->i_work_mask))
2271                 __ceph_do_pending_vmtruncate(inode);
2272
2273         if (test_and_clear_bit(CEPH_I_WORK_CHECK_CAPS, &ci->i_work_mask))
2274                 ceph_check_caps(ci, 0);
2275
2276         if (test_and_clear_bit(CEPH_I_WORK_FLUSH_SNAPS, &ci->i_work_mask))
2277                 ceph_flush_snaps(ci, NULL);
2278
2279         iput(inode);
2280 }
2281
2282 static const char *ceph_encrypted_get_link(struct dentry *dentry,
2283                                            struct inode *inode,
2284                                            struct delayed_call *done)
2285 {
2286         struct ceph_inode_info *ci = ceph_inode(inode);
2287
2288         if (!dentry)
2289                 return ERR_PTR(-ECHILD);
2290
2291         return fscrypt_get_symlink(inode, ci->i_symlink, i_size_read(inode),
2292                                    done);
2293 }
2294
2295 static int ceph_encrypted_symlink_getattr(struct mnt_idmap *idmap,
2296                                           const struct path *path,
2297                                           struct kstat *stat, u32 request_mask,
2298                                           unsigned int query_flags)
2299 {
2300         int ret;
2301
2302         ret = ceph_getattr(idmap, path, stat, request_mask, query_flags);
2303         if (ret)
2304                 return ret;
2305         return fscrypt_symlink_getattr(path, stat);
2306 }
2307
2308 /*
2309  * symlinks
2310  */
2311 static const struct inode_operations ceph_symlink_iops = {
2312         .get_link = simple_get_link,
2313         .setattr = ceph_setattr,
2314         .getattr = ceph_getattr,
2315         .listxattr = ceph_listxattr,
2316 };
2317
2318 static const struct inode_operations ceph_encrypted_symlink_iops = {
2319         .get_link = ceph_encrypted_get_link,
2320         .setattr = ceph_setattr,
2321         .getattr = ceph_encrypted_symlink_getattr,
2322         .listxattr = ceph_listxattr,
2323 };
2324
2325 /*
2326  * Transfer the encrypted last block to the MDS and the MDS
2327  * will help update it when truncating a smaller size.
2328  *
2329  * We don't support a PAGE_SIZE that is smaller than the
2330  * CEPH_FSCRYPT_BLOCK_SIZE.
2331  */
2332 static int fill_fscrypt_truncate(struct inode *inode,
2333                                  struct ceph_mds_request *req,
2334                                  struct iattr *attr)
2335 {
2336         struct ceph_client *cl = ceph_inode_to_client(inode);
2337         struct ceph_inode_info *ci = ceph_inode(inode);
2338         int boff = attr->ia_size % CEPH_FSCRYPT_BLOCK_SIZE;
2339         loff_t pos, orig_pos = round_down(attr->ia_size,
2340                                           CEPH_FSCRYPT_BLOCK_SIZE);
2341         u64 block = orig_pos >> CEPH_FSCRYPT_BLOCK_SHIFT;
2342         struct ceph_pagelist *pagelist = NULL;
2343         struct kvec iov = {0};
2344         struct iov_iter iter;
2345         struct page *page = NULL;
2346         struct ceph_fscrypt_truncate_size_header header;
2347         int retry_op = 0;
2348         int len = CEPH_FSCRYPT_BLOCK_SIZE;
2349         loff_t i_size = i_size_read(inode);
2350         int got, ret, issued;
2351         u64 objver;
2352
2353         ret = __ceph_get_caps(inode, NULL, CEPH_CAP_FILE_RD, 0, -1, &got);
2354         if (ret < 0)
2355                 return ret;
2356
2357         issued = __ceph_caps_issued(ci, NULL);
2358
2359         doutc(cl, "size %lld -> %lld got cap refs on %s, issued %s\n",
2360               i_size, attr->ia_size, ceph_cap_string(got),
2361               ceph_cap_string(issued));
2362
2363         /* Try to writeback the dirty pagecaches */
2364         if (issued & (CEPH_CAP_FILE_BUFFER)) {
2365                 loff_t lend = orig_pos + CEPH_FSCRYPT_BLOCK_SHIFT - 1;
2366
2367                 ret = filemap_write_and_wait_range(inode->i_mapping,
2368                                                    orig_pos, lend);
2369                 if (ret < 0)
2370                         goto out;
2371         }
2372
2373         page = __page_cache_alloc(GFP_KERNEL);
2374         if (page == NULL) {
2375                 ret = -ENOMEM;
2376                 goto out;
2377         }
2378
2379         pagelist = ceph_pagelist_alloc(GFP_KERNEL);
2380         if (!pagelist) {
2381                 ret = -ENOMEM;
2382                 goto out;
2383         }
2384
2385         iov.iov_base = kmap_local_page(page);
2386         iov.iov_len = len;
2387         iov_iter_kvec(&iter, READ, &iov, 1, len);
2388
2389         pos = orig_pos;
2390         ret = __ceph_sync_read(inode, &pos, &iter, &retry_op, &objver);
2391         if (ret < 0)
2392                 goto out;
2393
2394         /* Insert the header first */
2395         header.ver = 1;
2396         header.compat = 1;
2397         header.change_attr = cpu_to_le64(inode_peek_iversion_raw(inode));
2398
2399         /*
2400          * Always set the block_size to CEPH_FSCRYPT_BLOCK_SIZE,
2401          * because in MDS it may need this to do the truncate.
2402          */
2403         header.block_size = cpu_to_le32(CEPH_FSCRYPT_BLOCK_SIZE);
2404
2405         /*
2406          * If we hit a hole here, we should just skip filling
2407          * the fscrypt for the request, because once the fscrypt
2408          * is enabled, the file will be split into many blocks
2409          * with the size of CEPH_FSCRYPT_BLOCK_SIZE, if there
2410          * has a hole, the hole size should be multiple of block
2411          * size.
2412          *
2413          * If the Rados object doesn't exist, it will be set to 0.
2414          */
2415         if (!objver) {
2416                 doutc(cl, "hit hole, ppos %lld < size %lld\n", pos, i_size);
2417
2418                 header.data_len = cpu_to_le32(8 + 8 + 4);
2419                 header.file_offset = 0;
2420                 ret = 0;
2421         } else {
2422                 header.data_len = cpu_to_le32(8 + 8 + 4 + CEPH_FSCRYPT_BLOCK_SIZE);
2423                 header.file_offset = cpu_to_le64(orig_pos);
2424
2425                 doutc(cl, "encrypt block boff/bsize %d/%lu\n", boff,
2426                       CEPH_FSCRYPT_BLOCK_SIZE);
2427
2428                 /* truncate and zero out the extra contents for the last block */
2429                 memset(iov.iov_base + boff, 0, PAGE_SIZE - boff);
2430
2431                 /* encrypt the last block */
2432                 ret = ceph_fscrypt_encrypt_block_inplace(inode, page,
2433                                                     CEPH_FSCRYPT_BLOCK_SIZE,
2434                                                     0, block,
2435                                                     GFP_KERNEL);
2436                 if (ret)
2437                         goto out;
2438         }
2439
2440         /* Insert the header */
2441         ret = ceph_pagelist_append(pagelist, &header, sizeof(header));
2442         if (ret)
2443                 goto out;
2444
2445         if (header.block_size) {
2446                 /* Append the last block contents to pagelist */
2447                 ret = ceph_pagelist_append(pagelist, iov.iov_base,
2448                                            CEPH_FSCRYPT_BLOCK_SIZE);
2449                 if (ret)
2450                         goto out;
2451         }
2452         req->r_pagelist = pagelist;
2453 out:
2454         doutc(cl, "%p %llx.%llx size dropping cap refs on %s\n", inode,
2455               ceph_vinop(inode), ceph_cap_string(got));
2456         ceph_put_cap_refs(ci, got);
2457         if (iov.iov_base)
2458                 kunmap_local(iov.iov_base);
2459         if (page)
2460                 __free_pages(page, 0);
2461         if (ret && pagelist)
2462                 ceph_pagelist_release(pagelist);
2463         return ret;
2464 }
2465
2466 int __ceph_setattr(struct mnt_idmap *idmap, struct inode *inode,
2467                    struct iattr *attr, struct ceph_iattr *cia)
2468 {
2469         struct ceph_inode_info *ci = ceph_inode(inode);
2470         unsigned int ia_valid = attr->ia_valid;
2471         struct ceph_mds_request *req;
2472         struct ceph_mds_client *mdsc = ceph_sb_to_fs_client(inode->i_sb)->mdsc;
2473         struct ceph_client *cl = ceph_inode_to_client(inode);
2474         struct ceph_cap_flush *prealloc_cf;
2475         loff_t isize = i_size_read(inode);
2476         int issued;
2477         int release = 0, dirtied = 0;
2478         int mask = 0;
2479         int err = 0;
2480         int inode_dirty_flags = 0;
2481         bool lock_snap_rwsem = false;
2482         bool fill_fscrypt;
2483         int truncate_retry = 20; /* The RMW will take around 50ms */
2484         struct dentry *dentry;
2485         char *path;
2486         int pathlen;
2487         u64 pathbase;
2488         bool do_sync = false;
2489
2490         dentry = d_find_alias(inode);
2491         if (!dentry) {
2492                 do_sync = true;
2493         } else {
2494                 path = ceph_mdsc_build_path(mdsc, dentry, &pathlen, &pathbase, 0);
2495                 if (IS_ERR(path)) {
2496                         do_sync = true;
2497                         err = 0;
2498                 } else {
2499                         err = ceph_mds_check_access(mdsc, path, MAY_WRITE);
2500                 }
2501                 ceph_mdsc_free_path(path, pathlen);
2502                 dput(dentry);
2503
2504                 /* For none EACCES cases will let the MDS do the mds auth check */
2505                 if (err == -EACCES) {
2506                         return err;
2507                 } else if (err < 0) {
2508                         do_sync = true;
2509                         err = 0;
2510                 }
2511         }
2512
2513 retry:
2514         prealloc_cf = ceph_alloc_cap_flush();
2515         if (!prealloc_cf)
2516                 return -ENOMEM;
2517
2518         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETATTR,
2519                                        USE_AUTH_MDS);
2520         if (IS_ERR(req)) {
2521                 ceph_free_cap_flush(prealloc_cf);
2522                 return PTR_ERR(req);
2523         }
2524
2525         fill_fscrypt = false;
2526         spin_lock(&ci->i_ceph_lock);
2527         issued = __ceph_caps_issued(ci, NULL);
2528
2529         if (!ci->i_head_snapc &&
2530             (issued & (CEPH_CAP_ANY_EXCL | CEPH_CAP_FILE_WR))) {
2531                 lock_snap_rwsem = true;
2532                 if (!down_read_trylock(&mdsc->snap_rwsem)) {
2533                         spin_unlock(&ci->i_ceph_lock);
2534                         down_read(&mdsc->snap_rwsem);
2535                         spin_lock(&ci->i_ceph_lock);
2536                         issued = __ceph_caps_issued(ci, NULL);
2537                 }
2538         }
2539
2540         doutc(cl, "%p %llx.%llx issued %s\n", inode, ceph_vinop(inode),
2541               ceph_cap_string(issued));
2542 #if IS_ENABLED(CONFIG_FS_ENCRYPTION)
2543         if (cia && cia->fscrypt_auth) {
2544                 u32 len = ceph_fscrypt_auth_len(cia->fscrypt_auth);
2545
2546                 if (len > sizeof(*cia->fscrypt_auth)) {
2547                         err = -EINVAL;
2548                         spin_unlock(&ci->i_ceph_lock);
2549                         goto out;
2550                 }
2551
2552                 doutc(cl, "%p %llx.%llx fscrypt_auth len %u to %u)\n", inode,
2553                       ceph_vinop(inode), ci->fscrypt_auth_len, len);
2554
2555                 /* It should never be re-set once set */
2556                 WARN_ON_ONCE(ci->fscrypt_auth);
2557
2558                 if (!do_sync && (issued & CEPH_CAP_AUTH_EXCL)) {
2559                         dirtied |= CEPH_CAP_AUTH_EXCL;
2560                         kfree(ci->fscrypt_auth);
2561                         ci->fscrypt_auth = (u8 *)cia->fscrypt_auth;
2562                         ci->fscrypt_auth_len = len;
2563                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
2564                            ci->fscrypt_auth_len != len ||
2565                            memcmp(ci->fscrypt_auth, cia->fscrypt_auth, len)) {
2566                         req->r_fscrypt_auth = cia->fscrypt_auth;
2567                         mask |= CEPH_SETATTR_FSCRYPT_AUTH;
2568                         release |= CEPH_CAP_AUTH_SHARED;
2569                 }
2570                 cia->fscrypt_auth = NULL;
2571         }
2572 #else
2573         if (cia && cia->fscrypt_auth) {
2574                 err = -EINVAL;
2575                 spin_unlock(&ci->i_ceph_lock);
2576                 goto out;
2577         }
2578 #endif /* CONFIG_FS_ENCRYPTION */
2579
2580         if (ia_valid & ATTR_UID) {
2581                 kuid_t fsuid = from_vfsuid(idmap, i_user_ns(inode), attr->ia_vfsuid);
2582
2583                 doutc(cl, "%p %llx.%llx uid %d -> %d\n", inode,
2584                       ceph_vinop(inode),
2585                       from_kuid(&init_user_ns, inode->i_uid),
2586                       from_kuid(&init_user_ns, attr->ia_uid));
2587                 if (!do_sync && (issued & CEPH_CAP_AUTH_EXCL)) {
2588                         inode->i_uid = fsuid;
2589                         dirtied |= CEPH_CAP_AUTH_EXCL;
2590                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
2591                            !uid_eq(fsuid, inode->i_uid)) {
2592                         req->r_args.setattr.uid = cpu_to_le32(
2593                                 from_kuid(&init_user_ns, fsuid));
2594                         mask |= CEPH_SETATTR_UID;
2595                         release |= CEPH_CAP_AUTH_SHARED;
2596                 }
2597         }
2598         if (ia_valid & ATTR_GID) {
2599                 kgid_t fsgid = from_vfsgid(idmap, i_user_ns(inode), attr->ia_vfsgid);
2600
2601                 doutc(cl, "%p %llx.%llx gid %d -> %d\n", inode,
2602                       ceph_vinop(inode),
2603                       from_kgid(&init_user_ns, inode->i_gid),
2604                       from_kgid(&init_user_ns, attr->ia_gid));
2605                 if (!do_sync && (issued & CEPH_CAP_AUTH_EXCL)) {
2606                         inode->i_gid = fsgid;
2607                         dirtied |= CEPH_CAP_AUTH_EXCL;
2608                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
2609                            !gid_eq(fsgid, inode->i_gid)) {
2610                         req->r_args.setattr.gid = cpu_to_le32(
2611                                 from_kgid(&init_user_ns, fsgid));
2612                         mask |= CEPH_SETATTR_GID;
2613                         release |= CEPH_CAP_AUTH_SHARED;
2614                 }
2615         }
2616         if (ia_valid & ATTR_MODE) {
2617                 doutc(cl, "%p %llx.%llx mode 0%o -> 0%o\n", inode,
2618                       ceph_vinop(inode), inode->i_mode, attr->ia_mode);
2619                 if (!do_sync && (issued & CEPH_CAP_AUTH_EXCL)) {
2620                         inode->i_mode = attr->ia_mode;
2621                         dirtied |= CEPH_CAP_AUTH_EXCL;
2622                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
2623                            attr->ia_mode != inode->i_mode) {
2624                         inode->i_mode = attr->ia_mode;
2625                         req->r_args.setattr.mode = cpu_to_le32(attr->ia_mode);
2626                         mask |= CEPH_SETATTR_MODE;
2627                         release |= CEPH_CAP_AUTH_SHARED;
2628                 }
2629         }
2630
2631         if (ia_valid & ATTR_ATIME) {
2632                 struct timespec64 atime = inode_get_atime(inode);
2633
2634                 doutc(cl, "%p %llx.%llx atime %lld.%09ld -> %lld.%09ld\n",
2635                       inode, ceph_vinop(inode),
2636                       atime.tv_sec, atime.tv_nsec,
2637                       attr->ia_atime.tv_sec, attr->ia_atime.tv_nsec);
2638                 if (!do_sync && (issued & CEPH_CAP_FILE_EXCL)) {
2639                         ci->i_time_warp_seq++;
2640                         inode_set_atime_to_ts(inode, attr->ia_atime);
2641                         dirtied |= CEPH_CAP_FILE_EXCL;
2642                 } else if (!do_sync && (issued & CEPH_CAP_FILE_WR) &&
2643                            timespec64_compare(&atime,
2644                                               &attr->ia_atime) < 0) {
2645                         inode_set_atime_to_ts(inode, attr->ia_atime);
2646                         dirtied |= CEPH_CAP_FILE_WR;
2647                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
2648                            !timespec64_equal(&atime, &attr->ia_atime)) {
2649                         ceph_encode_timespec64(&req->r_args.setattr.atime,
2650                                                &attr->ia_atime);
2651                         mask |= CEPH_SETATTR_ATIME;
2652                         release |= CEPH_CAP_FILE_SHARED |
2653                                    CEPH_CAP_FILE_RD | CEPH_CAP_FILE_WR;
2654                 }
2655         }
2656         if (ia_valid & ATTR_SIZE) {
2657                 doutc(cl, "%p %llx.%llx size %lld -> %lld\n", inode,
2658                       ceph_vinop(inode), isize, attr->ia_size);
2659                 /*
2660                  * Only when the new size is smaller and not aligned to
2661                  * CEPH_FSCRYPT_BLOCK_SIZE will the RMW is needed.
2662                  */
2663                 if (IS_ENCRYPTED(inode) && attr->ia_size < isize &&
2664                     (attr->ia_size % CEPH_FSCRYPT_BLOCK_SIZE)) {
2665                         mask |= CEPH_SETATTR_SIZE;
2666                         release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_EXCL |
2667                                    CEPH_CAP_FILE_RD | CEPH_CAP_FILE_WR;
2668                         set_bit(CEPH_MDS_R_FSCRYPT_FILE, &req->r_req_flags);
2669                         mask |= CEPH_SETATTR_FSCRYPT_FILE;
2670                         req->r_args.setattr.size =
2671                                 cpu_to_le64(round_up(attr->ia_size,
2672                                                      CEPH_FSCRYPT_BLOCK_SIZE));
2673                         req->r_args.setattr.old_size =
2674                                 cpu_to_le64(round_up(isize,
2675                                                      CEPH_FSCRYPT_BLOCK_SIZE));
2676                         req->r_fscrypt_file = attr->ia_size;
2677                         fill_fscrypt = true;
2678                 } else if (!do_sync && (issued & CEPH_CAP_FILE_EXCL) && attr->ia_size >= isize) {
2679                         if (attr->ia_size > isize) {
2680                                 i_size_write(inode, attr->ia_size);
2681                                 inode->i_blocks = calc_inode_blocks(attr->ia_size);
2682                                 ci->i_reported_size = attr->ia_size;
2683                                 dirtied |= CEPH_CAP_FILE_EXCL;
2684                                 ia_valid |= ATTR_MTIME;
2685                         }
2686                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
2687                            attr->ia_size != isize) {
2688                         mask |= CEPH_SETATTR_SIZE;
2689                         release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_EXCL |
2690                                    CEPH_CAP_FILE_RD | CEPH_CAP_FILE_WR;
2691                         if (IS_ENCRYPTED(inode) && attr->ia_size) {
2692                                 set_bit(CEPH_MDS_R_FSCRYPT_FILE, &req->r_req_flags);
2693                                 mask |= CEPH_SETATTR_FSCRYPT_FILE;
2694                                 req->r_args.setattr.size =
2695                                         cpu_to_le64(round_up(attr->ia_size,
2696                                                              CEPH_FSCRYPT_BLOCK_SIZE));
2697                                 req->r_args.setattr.old_size =
2698                                         cpu_to_le64(round_up(isize,
2699                                                              CEPH_FSCRYPT_BLOCK_SIZE));
2700                                 req->r_fscrypt_file = attr->ia_size;
2701                         } else {
2702                                 req->r_args.setattr.size = cpu_to_le64(attr->ia_size);
2703                                 req->r_args.setattr.old_size = cpu_to_le64(isize);
2704                                 req->r_fscrypt_file = 0;
2705                         }
2706                 }
2707         }
2708         if (ia_valid & ATTR_MTIME) {
2709                 struct timespec64 mtime = inode_get_mtime(inode);
2710
2711                 doutc(cl, "%p %llx.%llx mtime %lld.%09ld -> %lld.%09ld\n",
2712                       inode, ceph_vinop(inode),
2713                       mtime.tv_sec, mtime.tv_nsec,
2714                       attr->ia_mtime.tv_sec, attr->ia_mtime.tv_nsec);
2715                 if (!do_sync && (issued & CEPH_CAP_FILE_EXCL)) {
2716                         ci->i_time_warp_seq++;
2717                         inode_set_mtime_to_ts(inode, attr->ia_mtime);
2718                         dirtied |= CEPH_CAP_FILE_EXCL;
2719                 } else if (!do_sync && (issued & CEPH_CAP_FILE_WR) &&
2720                            timespec64_compare(&mtime, &attr->ia_mtime) < 0) {
2721                         inode_set_mtime_to_ts(inode, attr->ia_mtime);
2722                         dirtied |= CEPH_CAP_FILE_WR;
2723                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
2724                            !timespec64_equal(&mtime, &attr->ia_mtime)) {
2725                         ceph_encode_timespec64(&req->r_args.setattr.mtime,
2726                                                &attr->ia_mtime);
2727                         mask |= CEPH_SETATTR_MTIME;
2728                         release |= CEPH_CAP_FILE_SHARED |
2729                                    CEPH_CAP_FILE_RD | CEPH_CAP_FILE_WR;
2730                 }
2731         }
2732
2733         /* these do nothing */
2734         if (ia_valid & ATTR_CTIME) {
2735                 bool only = (ia_valid & (ATTR_SIZE|ATTR_MTIME|ATTR_ATIME|
2736                                          ATTR_MODE|ATTR_UID|ATTR_GID)) == 0;
2737                 doutc(cl, "%p %llx.%llx ctime %lld.%09ld -> %lld.%09ld (%s)\n",
2738                       inode, ceph_vinop(inode),
2739                       inode_get_ctime_sec(inode),
2740                       inode_get_ctime_nsec(inode),
2741                       attr->ia_ctime.tv_sec, attr->ia_ctime.tv_nsec,
2742                       only ? "ctime only" : "ignored");
2743                 if (only) {
2744                         /*
2745                          * if kernel wants to dirty ctime but nothing else,
2746                          * we need to choose a cap to dirty under, or do
2747                          * a almost-no-op setattr
2748                          */
2749                         if (issued & CEPH_CAP_AUTH_EXCL)
2750                                 dirtied |= CEPH_CAP_AUTH_EXCL;
2751                         else if (issued & CEPH_CAP_FILE_EXCL)
2752                                 dirtied |= CEPH_CAP_FILE_EXCL;
2753                         else if (issued & CEPH_CAP_XATTR_EXCL)
2754                                 dirtied |= CEPH_CAP_XATTR_EXCL;
2755                         else
2756                                 mask |= CEPH_SETATTR_CTIME;
2757                 }
2758         }
2759         if (ia_valid & ATTR_FILE)
2760                 doutc(cl, "%p %llx.%llx ATTR_FILE ... hrm!\n", inode,
2761                       ceph_vinop(inode));
2762
2763         if (dirtied) {
2764                 inode_dirty_flags = __ceph_mark_dirty_caps(ci, dirtied,
2765                                                            &prealloc_cf);
2766                 inode_set_ctime_to_ts(inode, attr->ia_ctime);
2767                 inode_inc_iversion_raw(inode);
2768         }
2769
2770         release &= issued;
2771         spin_unlock(&ci->i_ceph_lock);
2772         if (lock_snap_rwsem) {
2773                 up_read(&mdsc->snap_rwsem);
2774                 lock_snap_rwsem = false;
2775         }
2776
2777         if (inode_dirty_flags)
2778                 __mark_inode_dirty(inode, inode_dirty_flags);
2779
2780         if (mask) {
2781                 req->r_inode = inode;
2782                 ihold(inode);
2783                 req->r_inode_drop = release;
2784                 req->r_args.setattr.mask = cpu_to_le32(mask);
2785                 req->r_num_caps = 1;
2786                 req->r_stamp = attr->ia_ctime;
2787                 if (fill_fscrypt) {
2788                         err = fill_fscrypt_truncate(inode, req, attr);
2789                         if (err)
2790                                 goto out;
2791                 }
2792
2793                 /*
2794                  * The truncate request will return -EAGAIN when the
2795                  * last block has been updated just before the MDS
2796                  * successfully gets the xlock for the FILE lock. To
2797                  * avoid corrupting the file contents we need to retry
2798                  * it.
2799                  */
2800                 err = ceph_mdsc_do_request(mdsc, NULL, req);
2801                 if (err == -EAGAIN && truncate_retry--) {
2802                         doutc(cl, "%p %llx.%llx result=%d (%s locally, %d remote), retry it!\n",
2803                               inode, ceph_vinop(inode), err,
2804                               ceph_cap_string(dirtied), mask);
2805                         ceph_mdsc_put_request(req);
2806                         ceph_free_cap_flush(prealloc_cf);
2807                         goto retry;
2808                 }
2809         }
2810 out:
2811         doutc(cl, "%p %llx.%llx result=%d (%s locally, %d remote)\n", inode,
2812               ceph_vinop(inode), err, ceph_cap_string(dirtied), mask);
2813
2814         ceph_mdsc_put_request(req);
2815         ceph_free_cap_flush(prealloc_cf);
2816
2817         if (err >= 0 && (mask & CEPH_SETATTR_SIZE))
2818                 __ceph_do_pending_vmtruncate(inode);
2819
2820         return err;
2821 }
2822
2823 /*
2824  * setattr
2825  */
2826 int ceph_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
2827                  struct iattr *attr)
2828 {
2829         struct inode *inode = d_inode(dentry);
2830         struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);
2831         int err;
2832
2833         if (ceph_snap(inode) != CEPH_NOSNAP)
2834                 return -EROFS;
2835
2836         if (ceph_inode_is_shutdown(inode))
2837                 return -ESTALE;
2838
2839         err = fscrypt_prepare_setattr(dentry, attr);
2840         if (err)
2841                 return err;
2842
2843         err = setattr_prepare(idmap, dentry, attr);
2844         if (err != 0)
2845                 return err;
2846
2847         if ((attr->ia_valid & ATTR_SIZE) &&
2848             attr->ia_size > max(i_size_read(inode), fsc->max_file_size))
2849                 return -EFBIG;
2850
2851         if ((attr->ia_valid & ATTR_SIZE) &&
2852             ceph_quota_is_max_bytes_exceeded(inode, attr->ia_size))
2853                 return -EDQUOT;
2854
2855         err = __ceph_setattr(idmap, inode, attr, NULL);
2856
2857         if (err >= 0 && (attr->ia_valid & ATTR_MODE))
2858                 err = posix_acl_chmod(idmap, dentry, attr->ia_mode);
2859
2860         return err;
2861 }
2862
2863 int ceph_try_to_choose_auth_mds(struct inode *inode, int mask)
2864 {
2865         int issued = ceph_caps_issued(ceph_inode(inode));
2866
2867         /*
2868          * If any 'x' caps is issued we can just choose the auth MDS
2869          * instead of the random replica MDSes. Because only when the
2870          * Locker is in LOCK_EXEC state will the loner client could
2871          * get the 'x' caps. And if we send the getattr requests to
2872          * any replica MDS it must auth pin and tries to rdlock from
2873          * the auth MDS, and then the auth MDS need to do the Locker
2874          * state transition to LOCK_SYNC. And after that the lock state
2875          * will change back.
2876          *
2877          * This cost much when doing the Locker state transition and
2878          * usually will need to revoke caps from clients.
2879          *
2880          * And for the 'Xs' caps for getxattr we will also choose the
2881          * auth MDS, because the MDS side code is buggy due to setxattr
2882          * won't notify the replica MDSes when the values changed and
2883          * the replica MDS will return the old values. Though we will
2884          * fix it in MDS code, but this still makes sense for old ceph.
2885          */
2886         if (((mask & CEPH_CAP_ANY_SHARED) && (issued & CEPH_CAP_ANY_EXCL))
2887             || (mask & (CEPH_STAT_RSTAT | CEPH_STAT_CAP_XATTR)))
2888                 return USE_AUTH_MDS;
2889         else
2890                 return USE_ANY_MDS;
2891 }
2892
2893 /*
2894  * Verify that we have a lease on the given mask.  If not,
2895  * do a getattr against an mds.
2896  */
2897 int __ceph_do_getattr(struct inode *inode, struct page *locked_page,
2898                       int mask, bool force)
2899 {
2900         struct ceph_fs_client *fsc = ceph_sb_to_fs_client(inode->i_sb);
2901         struct ceph_client *cl = fsc->client;
2902         struct ceph_mds_client *mdsc = fsc->mdsc;
2903         struct ceph_mds_request *req;
2904         int mode;
2905         int err;
2906
2907         if (ceph_snap(inode) == CEPH_SNAPDIR) {
2908                 doutc(cl, "inode %p %llx.%llx SNAPDIR\n", inode,
2909                       ceph_vinop(inode));
2910                 return 0;
2911         }
2912
2913         doutc(cl, "inode %p %llx.%llx mask %s mode 0%o\n", inode,
2914               ceph_vinop(inode), ceph_cap_string(mask), inode->i_mode);
2915         if (!force && ceph_caps_issued_mask_metric(ceph_inode(inode), mask, 1))
2916                         return 0;
2917
2918         mode = ceph_try_to_choose_auth_mds(inode, mask);
2919         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, mode);
2920         if (IS_ERR(req))
2921                 return PTR_ERR(req);
2922         req->r_inode = inode;
2923         ihold(inode);
2924         req->r_num_caps = 1;
2925         req->r_args.getattr.mask = cpu_to_le32(mask);
2926         req->r_locked_page = locked_page;
2927         err = ceph_mdsc_do_request(mdsc, NULL, req);
2928         if (locked_page && err == 0) {
2929                 u64 inline_version = req->r_reply_info.targeti.inline_version;
2930                 if (inline_version == 0) {
2931                         /* the reply is supposed to contain inline data */
2932                         err = -EINVAL;
2933                 } else if (inline_version == CEPH_INLINE_NONE ||
2934                            inline_version == 1) {
2935                         err = -ENODATA;
2936                 } else {
2937                         err = req->r_reply_info.targeti.inline_len;
2938                 }
2939         }
2940         ceph_mdsc_put_request(req);
2941         doutc(cl, "result=%d\n", err);
2942         return err;
2943 }
2944
2945 int ceph_do_getvxattr(struct inode *inode, const char *name, void *value,
2946                       size_t size)
2947 {
2948         struct ceph_fs_client *fsc = ceph_sb_to_fs_client(inode->i_sb);
2949         struct ceph_client *cl = fsc->client;
2950         struct ceph_mds_client *mdsc = fsc->mdsc;
2951         struct ceph_mds_request *req;
2952         int mode = USE_AUTH_MDS;
2953         int err;
2954         char *xattr_value;
2955         size_t xattr_value_len;
2956
2957         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETVXATTR, mode);
2958         if (IS_ERR(req)) {
2959                 err = -ENOMEM;
2960                 goto out;
2961         }
2962
2963         req->r_feature_needed = CEPHFS_FEATURE_OP_GETVXATTR;
2964         req->r_path2 = kstrdup(name, GFP_NOFS);
2965         if (!req->r_path2) {
2966                 err = -ENOMEM;
2967                 goto put;
2968         }
2969
2970         ihold(inode);
2971         req->r_inode = inode;
2972         err = ceph_mdsc_do_request(mdsc, NULL, req);
2973         if (err < 0)
2974                 goto put;
2975
2976         xattr_value = req->r_reply_info.xattr_info.xattr_value;
2977         xattr_value_len = req->r_reply_info.xattr_info.xattr_value_len;
2978
2979         doutc(cl, "xattr_value_len:%zu, size:%zu\n", xattr_value_len, size);
2980
2981         err = (int)xattr_value_len;
2982         if (size == 0)
2983                 goto put;
2984
2985         if (xattr_value_len > size) {
2986                 err = -ERANGE;
2987                 goto put;
2988         }
2989
2990         memcpy(value, xattr_value, xattr_value_len);
2991 put:
2992         ceph_mdsc_put_request(req);
2993 out:
2994         doutc(cl, "result=%d\n", err);
2995         return err;
2996 }
2997
2998
2999 /*
3000  * Check inode permissions.  We verify we have a valid value for
3001  * the AUTH cap, then call the generic handler.
3002  */
3003 int ceph_permission(struct mnt_idmap *idmap, struct inode *inode,
3004                     int mask)
3005 {
3006         int err;
3007
3008         if (mask & MAY_NOT_BLOCK)
3009                 return -ECHILD;
3010
3011         err = ceph_do_getattr(inode, CEPH_CAP_AUTH_SHARED, false);
3012
3013         if (!err)
3014                 err = generic_permission(idmap, inode, mask);
3015         return err;
3016 }
3017
3018 /* Craft a mask of needed caps given a set of requested statx attrs. */
3019 static int statx_to_caps(u32 want, umode_t mode)
3020 {
3021         int mask = 0;
3022
3023         if (want & (STATX_MODE|STATX_UID|STATX_GID|STATX_CTIME|STATX_BTIME|STATX_CHANGE_COOKIE))
3024                 mask |= CEPH_CAP_AUTH_SHARED;
3025
3026         if (want & (STATX_NLINK|STATX_CTIME|STATX_CHANGE_COOKIE)) {
3027                 /*
3028                  * The link count for directories depends on inode->i_subdirs,
3029                  * and that is only updated when Fs caps are held.
3030                  */
3031                 if (S_ISDIR(mode))
3032                         mask |= CEPH_CAP_FILE_SHARED;
3033                 else
3034                         mask |= CEPH_CAP_LINK_SHARED;
3035         }
3036
3037         if (want & (STATX_ATIME|STATX_MTIME|STATX_CTIME|STATX_SIZE|STATX_BLOCKS|STATX_CHANGE_COOKIE))
3038                 mask |= CEPH_CAP_FILE_SHARED;
3039
3040         if (want & (STATX_CTIME|STATX_CHANGE_COOKIE))
3041                 mask |= CEPH_CAP_XATTR_SHARED;
3042
3043         return mask;
3044 }
3045
3046 /*
3047  * Get all the attributes. If we have sufficient caps for the requested attrs,
3048  * then we can avoid talking to the MDS at all.
3049  */
3050 int ceph_getattr(struct mnt_idmap *idmap, const struct path *path,
3051                  struct kstat *stat, u32 request_mask, unsigned int flags)
3052 {
3053         struct inode *inode = d_inode(path->dentry);
3054         struct super_block *sb = inode->i_sb;
3055         struct ceph_inode_info *ci = ceph_inode(inode);
3056         u32 valid_mask = STATX_BASIC_STATS;
3057         int err = 0;
3058
3059         if (ceph_inode_is_shutdown(inode))
3060                 return -ESTALE;
3061
3062         /* Skip the getattr altogether if we're asked not to sync */
3063         if ((flags & AT_STATX_SYNC_TYPE) != AT_STATX_DONT_SYNC) {
3064                 err = ceph_do_getattr(inode,
3065                                 statx_to_caps(request_mask, inode->i_mode),
3066                                 flags & AT_STATX_FORCE_SYNC);
3067                 if (err)
3068                         return err;
3069         }
3070
3071         generic_fillattr(idmap, request_mask, inode, stat);
3072         stat->ino = ceph_present_inode(inode);
3073
3074         /*
3075          * btime on newly-allocated inodes is 0, so if this is still set to
3076          * that, then assume that it's not valid.
3077          */
3078         if (ci->i_btime.tv_sec || ci->i_btime.tv_nsec) {
3079                 stat->btime = ci->i_btime;
3080                 valid_mask |= STATX_BTIME;
3081         }
3082
3083         if (request_mask & STATX_CHANGE_COOKIE) {
3084                 stat->change_cookie = inode_peek_iversion_raw(inode);
3085                 valid_mask |= STATX_CHANGE_COOKIE;
3086         }
3087
3088         if (ceph_snap(inode) == CEPH_NOSNAP)
3089                 stat->dev = sb->s_dev;
3090         else
3091                 stat->dev = ci->i_snapid_map ? ci->i_snapid_map->dev : 0;
3092
3093         if (S_ISDIR(inode->i_mode)) {
3094                 if (ceph_test_mount_opt(ceph_sb_to_fs_client(sb), RBYTES)) {
3095                         stat->size = ci->i_rbytes;
3096                 } else if (ceph_snap(inode) == CEPH_SNAPDIR) {
3097                         struct ceph_inode_info *pci;
3098                         struct ceph_snap_realm *realm;
3099                         struct inode *parent;
3100
3101                         parent = ceph_lookup_inode(sb, ceph_ino(inode));
3102                         if (IS_ERR(parent))
3103                                 return PTR_ERR(parent);
3104
3105                         pci = ceph_inode(parent);
3106                         spin_lock(&pci->i_ceph_lock);
3107                         realm = pci->i_snap_realm;
3108                         if (realm)
3109                                 stat->size = realm->num_snaps;
3110                         else
3111                                 stat->size = 0;
3112                         spin_unlock(&pci->i_ceph_lock);
3113                         iput(parent);
3114                 } else {
3115                         stat->size = ci->i_files + ci->i_subdirs;
3116                 }
3117                 stat->blocks = 0;
3118                 stat->blksize = 65536;
3119                 /*
3120                  * Some applications rely on the number of st_nlink
3121                  * value on directories to be either 0 (if unlinked)
3122                  * or 2 + number of subdirectories.
3123                  */
3124                 if (stat->nlink == 1)
3125                         /* '.' + '..' + subdirs */
3126                         stat->nlink = 1 + 1 + ci->i_subdirs;
3127         }
3128
3129         stat->attributes |= STATX_ATTR_CHANGE_MONOTONIC;
3130         if (IS_ENCRYPTED(inode))
3131                 stat->attributes |= STATX_ATTR_ENCRYPTED;
3132         stat->attributes_mask |= (STATX_ATTR_CHANGE_MONOTONIC |
3133                                   STATX_ATTR_ENCRYPTED);
3134
3135         stat->result_mask = request_mask & valid_mask;
3136         return err;
3137 }
3138
3139 void ceph_inode_shutdown(struct inode *inode)
3140 {
3141         struct ceph_inode_info *ci = ceph_inode(inode);
3142         struct rb_node *p;
3143         int iputs = 0;
3144         bool invalidate = false;
3145
3146         spin_lock(&ci->i_ceph_lock);
3147         ci->i_ceph_flags |= CEPH_I_SHUTDOWN;
3148         p = rb_first(&ci->i_caps);
3149         while (p) {
3150                 struct ceph_cap *cap = rb_entry(p, struct ceph_cap, ci_node);
3151
3152                 p = rb_next(p);
3153                 iputs += ceph_purge_inode_cap(inode, cap, &invalidate);
3154         }
3155         spin_unlock(&ci->i_ceph_lock);
3156
3157         if (invalidate)
3158                 ceph_queue_invalidate(inode);
3159         while (iputs--)
3160                 iput(inode);
3161 }