lustre/llite/namei.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.gnu.org/licenses/gpl-2.0.html
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Use is subject to license terms.
  25  *
  26  * Copyright (c) 2011, 2017, Intel Corporation.
  27  */
  28 /*
  29  * This file is part of Lustre, http://www.lustre.org/
  30  */
  31
  32 #include <linux/fs.h>
  33 #include <linux/sched.h>
  34 #include <linux/mm.h>
  35 #include <linux/file.h>
  36 #include <linux/quotaops.h>
  37 #include <linux/highmem.h>
  38 #include <linux/pagemap.h>
  39 #include <linux/user_namespace.h>
  40 #include <linux/uidgid.h>
  41
  42 #define DEBUG_SUBSYSTEM S_LLITE
  43
  44 #include <obd_support.h>
  45 #include <lustre_fid.h>
  46 #include <lustre_dlm.h>
  47 #include "llite_internal.h"
  48
  49 #ifndef HAVE_USER_NAMESPACE_ARG
  50 #define ll_create_nd(ns, dir, de, mode, ex)     ll_create_nd(dir, de, mode, ex)
  51 #define ll_mkdir(ns, dir, dch, mode)            ll_mkdir(dir, dch, mode)
  52 #define ll_mknod(ns, dir, dch, mode, rd)        ll_mknod(dir, dch, mode, rd)
  53 #ifdef HAVE_IOPS_RENAME_WITH_FLAGS
  54 #define ll_rename(ns, src, sdc, tgt, tdc, fl)   ll_rename(src, sdc, tgt, tdc, fl)
  55 #else
  56 #define ll_rename(ns, src, sdc, tgt, tdc)       ll_rename(src, sdc, tgt, tdc)
  57 #endif /* HAVE_IOPS_RENAME_WITH_FLAGS */
  58 #define ll_symlink(nd, dir, dch, old)           ll_symlink(dir, dch, old)
  59 #endif
  60
  61 static int ll_create_it(struct inode *dir, struct dentry *dentry,
  62                         struct lookup_intent *it,
  63                         void *secctx, __u32 secctxlen, bool encrypt,
  64                         void *encctx, __u32 encctxlen, unsigned int open_flags);
  65
  66 /* called from iget5_locked->find_inode() under inode_lock spinlock */
  67 static int ll_test_inode(struct inode *inode, void *opaque)
  68 {
  69         struct ll_inode_info    *lli = ll_i2info(inode);
  70         struct lustre_md        *md = opaque;
  71
  72         if (unlikely(!(md->body->mbo_valid & OBD_MD_FLID))) {
  73                 CERROR("MDS body missing FID\n");
  74                 return 0;
  75         }
  76
  77         if (!lu_fid_eq(&lli->lli_fid, &md->body->mbo_fid1))
  78                 return 0;
  79
  80         return 1;
  81 }
  82
  83 static int ll_set_inode(struct inode *inode, void *opaque)
  84 {
  85         struct ll_inode_info *lli = ll_i2info(inode);
  86         struct mdt_body *body = ((struct lustre_md *)opaque)->body;
  87
  88         if (unlikely(!(body->mbo_valid & OBD_MD_FLID))) {
  89                 CERROR("MDS body missing FID\n");
  90                 return -EINVAL;
  91         }
  92
  93         lli->lli_fid = body->mbo_fid1;
  94         if (unlikely(!(body->mbo_valid & OBD_MD_FLTYPE))) {
  95                 CERROR("Can not initialize inode "DFID" without object type: "
  96                        "valid = %#llx\n",
  97                        PFID(&lli->lli_fid), body->mbo_valid);
  98                 return -EINVAL;
  99         }
 100
 101         inode->i_mode = (inode->i_mode & ~S_IFMT) | (body->mbo_mode & S_IFMT);
 102         if (unlikely(inode->i_mode == 0)) {
 103                 CERROR("Invalid inode "DFID" type\n", PFID(&lli->lli_fid));
 104                 return -EINVAL;
 105         }
 106
 107         ll_lli_init(lli);
 108
 109         return 0;
 110 }
 111
 112
 113 /**
 114  * Get an inode by inode number(@hash), which is already instantiated by
 115  * the intent lookup).
 116  */
 117 struct inode *ll_iget(struct super_block *sb, ino_t hash,
 118                       struct lustre_md *md)
 119 {
 120         struct inode    *inode;
 121         int             rc = 0;
 122
 123         ENTRY;
 124
 125         LASSERT(hash != 0);
 126         inode = iget5_locked(sb, hash, ll_test_inode, ll_set_inode, md);
 127         if (inode == NULL)
 128                 RETURN(ERR_PTR(-ENOMEM));
 129
 130         if (inode->i_state & I_NEW) {
 131                 rc = ll_read_inode2(inode, md);
 132                 if (rc == 0 && S_ISREG(inode->i_mode) &&
 133                     ll_i2info(inode)->lli_clob == NULL)
 134                         rc = cl_file_inode_init(inode, md);
 135
 136                 if (rc != 0) {
 137                         /* Let's clear directory lsm here, otherwise
 138                          * make_bad_inode() will reset the inode mode
 139                          * to regular, then ll_clear_inode will not
 140                          * be able to clear lsm_md */
 141                         if (S_ISDIR(inode->i_mode))
 142                                 ll_dir_clear_lsm_md(inode);
 143                         make_bad_inode(inode);
 144                         unlock_new_inode(inode);
 145                         iput(inode);
 146                         inode = ERR_PTR(rc);
 147                 } else {
 148                         inode_has_no_xattr(inode);
 149                         unlock_new_inode(inode);
 150                 }
 151         } else if (is_bad_inode(inode)) {
 152                 iput(inode);
 153                 inode = ERR_PTR(-ESTALE);
 154         } else if (!(inode->i_state & (I_FREEING | I_CLEAR))) {
 155                 rc = ll_update_inode(inode, md);
 156                 CDEBUG(D_VFSTRACE, "got inode: "DFID"(%p): rc = %d\n",
 157                        PFID(&md->body->mbo_fid1), inode, rc);
 158                 if (rc != 0) {
 159                         if (S_ISDIR(inode->i_mode))
 160                                 ll_dir_clear_lsm_md(inode);
 161                         iput(inode);
 162                         inode = ERR_PTR(rc);
 163                 }
 164         }
 165
 166         RETURN(inode);
 167 }
 168
 169 /* mark negative sub file dentries invalid and prune unused dentries */
 170 static void ll_prune_negative_children(struct inode *dir)
 171 {
 172         struct dentry *dentry;
 173         struct dentry *child;
 174
 175         ENTRY;
 176
 177 restart:
 178         spin_lock(&dir->i_lock);
 179         hlist_for_each_entry(dentry, &dir->i_dentry, d_alias) {
 180                 spin_lock(&dentry->d_lock);
 181                 list_for_each_entry(child, &dentry->d_subdirs, d_child) {
 182                         if (child->d_inode)
 183                                 continue;
 184
 185                         spin_lock_nested(&child->d_lock, DENTRY_D_LOCK_NESTED);
 186                         if (lld_is_init(child))
 187                                 ll_d2d(child)->lld_invalid = 1;
 188                         if (!ll_d_count(child)) {
 189                                 dget_dlock(child);
 190                                 __d_drop(child);
 191                                 spin_unlock(&child->d_lock);
 192                                 spin_unlock(&dentry->d_lock);
 193                                 spin_unlock(&dir->i_lock);
 194
 195                                 CDEBUG(D_DENTRY, "prune negative dentry %pd\n",
 196                                        child);
 197
 198                                 dput(child);
 199                                 goto restart;
 200                         }
 201                         spin_unlock(&child->d_lock);
 202                 }
 203                 spin_unlock(&dentry->d_lock);
 204         }
 205         spin_unlock(&dir->i_lock);
 206
 207         EXIT;
 208 }
 209
 210 int ll_test_inode_by_fid(struct inode *inode, void *opaque)
 211 {
 212         return lu_fid_eq(&ll_i2info(inode)->lli_fid, opaque);
 213 }
 214
 215 static int ll_dom_lock_cancel(struct inode *inode, struct ldlm_lock *lock)
 216 {
 217         struct lu_env *env;
 218         struct ll_inode_info *lli = ll_i2info(inode);
 219         __u16 refcheck;
 220         int rc;
 221         ENTRY;
 222
 223         env = cl_env_get(&refcheck);
 224         if (IS_ERR(env))
 225                 RETURN(PTR_ERR(env));
 226
 227         OBD_FAIL_TIMEOUT(OBD_FAIL_LDLM_REPLAY_PAUSE, cfs_fail_val);
 228
 229         /* reach MDC layer to flush data under  the DoM ldlm lock */
 230         rc = cl_object_flush(env, lli->lli_clob, lock);
 231         if (rc == -ENODATA) {
 232                 CDEBUG(D_INODE, "inode "DFID" layout has no DoM stripe\n",
 233                        PFID(ll_inode2fid(inode)));
 234                 /* most likely result of layout change, do nothing */
 235                 rc = 0;
 236         }
 237
 238         cl_env_put(env, &refcheck);
 239         RETURN(rc);
 240 }
 241
 242 static void ll_lock_cancel_bits(struct ldlm_lock *lock, __u64 to_cancel)
 243 {
 244         struct inode *inode = ll_inode_from_resource_lock(lock);
 245         struct ll_inode_info *lli;
 246         __u64 bits = to_cancel;
 247         int rc;
 248
 249         ENTRY;
 250
 251         if (!inode) {
 252                 /* That means the inode is evicted most likely and may cause
 253                  * the skipping of lock cleanups below, so print the message
 254                  * about that in log.
 255                  */
 256                 if (lock->l_resource->lr_lvb_inode)
 257                         LDLM_DEBUG(lock,
 258                                    "can't take inode for the lock (%sevicted)",
 259                                    lock->l_resource->lr_lvb_inode->i_state &
 260                                    I_FREEING ? "" : "not ");
 261                 RETURN_EXIT;
 262         }
 263
 264         if (!fid_res_name_eq(ll_inode2fid(inode),
 265                              &lock->l_resource->lr_name)) {
 266                 LDLM_ERROR(lock, "data mismatch with object "DFID"(%p)",
 267                            PFID(ll_inode2fid(inode)), inode);
 268                 LBUG();
 269         }
 270
 271         if (bits & MDS_INODELOCK_XATTR) {
 272                 ll_xattr_cache_empty(inode);
 273                 bits &= ~MDS_INODELOCK_XATTR;
 274         }
 275
 276         /* For OPEN locks we differentiate between lock modes
 277          * LCK_CR, LCK_CW, LCK_PR - bug 22891 */
 278         if (bits & MDS_INODELOCK_OPEN)
 279                 ll_have_md_lock(inode, &bits, lock->l_req_mode);
 280
 281         if (bits & MDS_INODELOCK_OPEN) {
 282                 fmode_t fmode;
 283
 284                 switch (lock->l_req_mode) {
 285                 case LCK_CW:
 286                         fmode = FMODE_WRITE;
 287                         break;
 288                 case LCK_PR:
 289                         fmode = FMODE_EXEC;
 290                         break;
 291                 case LCK_CR:
 292                         fmode = FMODE_READ;
 293                         break;
 294                 default:
 295                         LDLM_ERROR(lock, "bad lock mode for OPEN lock");
 296                         LBUG();
 297                 }
 298
 299                 ll_md_real_close(inode, fmode);
 300
 301                 bits &= ~MDS_INODELOCK_OPEN;
 302         }
 303
 304         if (bits & (MDS_INODELOCK_LOOKUP | MDS_INODELOCK_UPDATE |
 305                     MDS_INODELOCK_LAYOUT | MDS_INODELOCK_PERM |
 306                     MDS_INODELOCK_DOM))
 307                 ll_have_md_lock(inode, &bits, LCK_MINMODE);
 308
 309         if (bits & MDS_INODELOCK_DOM) {
 310                 rc =  ll_dom_lock_cancel(inode, lock);
 311                 if (rc < 0)
 312                         CDEBUG(D_INODE, "cannot flush DoM data "
 313                                DFID": rc = %d\n",
 314                                PFID(ll_inode2fid(inode)), rc);
 315         }
 316
 317         if (bits & MDS_INODELOCK_LAYOUT) {
 318                 struct cl_object_conf conf = {
 319                         .coc_opc = OBJECT_CONF_INVALIDATE,
 320                         .coc_inode = inode,
 321                 };
 322
 323                 rc = ll_layout_conf(inode, &conf);
 324                 if (rc < 0)
 325                         CDEBUG(D_INODE, "cannot invalidate layout of "
 326                                DFID": rc = %d\n",
 327                                PFID(ll_inode2fid(inode)), rc);
 328         }
 329
 330         lli = ll_i2info(inode);
 331
 332         if (bits & MDS_INODELOCK_UPDATE)
 333                 set_bit(LLIF_UPDATE_ATIME, &lli->lli_flags);
 334
 335         if ((bits & MDS_INODELOCK_UPDATE) && S_ISDIR(inode->i_mode)) {
 336                 CDEBUG(D_INODE, "invalidating inode "DFID" lli = %p, "
 337                        "pfid  = "DFID"\n", PFID(ll_inode2fid(inode)),
 338                        lli, PFID(&lli->lli_pfid));
 339                 truncate_inode_pages(inode->i_mapping, 0);
 340
 341                 if (unlikely(!fid_is_zero(&lli->lli_pfid))) {
 342                         struct inode *master_inode = NULL;
 343                         unsigned long hash;
 344
 345                         /* This is slave inode, since all of the child dentry
 346                          * is connected on the master inode, so we have to
 347                          * invalidate the negative children on master inode */
 348                         CDEBUG(D_INODE, "Invalidate s"DFID" m"DFID"\n",
 349                                PFID(ll_inode2fid(inode)), PFID(&lli->lli_pfid));
 350
 351                         hash = cl_fid_build_ino(&lli->lli_pfid,
 352                                         ll_need_32bit_api(ll_i2sbi(inode)));
 353
 354                         /* Do not lookup the inode with ilookup5, otherwise
 355                          * it will cause dead lock,
 356                          * 1. Client1 send chmod req to the MDT0, then on MDT0,
 357                          * it enqueues master and all of its slaves lock,
 358                          * (mdt_attr_set() -> mdt_lock_slaves()), after gets
 359                          * master and stripe0 lock, it will send the enqueue
 360                          * req (for stripe1) to MDT1, then MDT1 finds the lock
 361                          * has been granted to client2. Then MDT1 sends blocking
 362                          * ast to client2.
 363                          * 2. At the same time, client2 tries to unlink
 364                          * the striped dir (rm -rf striped_dir), and during
 365                          * lookup, it will hold the master inode of the striped
 366                          * directory, whose inode state is NEW, then tries to
 367                          * revalidate all of its slaves, (ll_prep_inode()->
 368                          * ll_iget()->ll_read_inode2()-> ll_update_inode().).
 369                          * And it will be blocked on the server side because
 370                          * of 1.
 371                          * 3. Then the client get the blocking_ast req, cancel
 372                          * the lock, but being blocked if using ->ilookup5()),
 373                          * because master inode state is NEW. */
 374                         master_inode = ilookup5_nowait(inode->i_sb, hash,
 375                                                         ll_test_inode_by_fid,
 376                                                         (void *)&lli->lli_pfid);
 377                         if (master_inode) {
 378                                 ll_prune_negative_children(master_inode);
 379                                 iput(master_inode);
 380                         }
 381                 } else {
 382                         ll_prune_negative_children(inode);
 383                 }
 384         }
 385
 386         /* at umount s_root becomes NULL */
 387         if ((bits & (MDS_INODELOCK_LOOKUP | MDS_INODELOCK_PERM)) &&
 388             inode->i_sb->s_root && !is_root_inode(inode))
 389                 ll_prune_aliases(inode);
 390
 391         if (bits & (MDS_INODELOCK_LOOKUP | MDS_INODELOCK_PERM))
 392                 forget_all_cached_acls(inode);
 393
 394         iput(inode);
 395         RETURN_EXIT;
 396 }
 397
 398 /* Check if the given lock may be downgraded instead of canceling and
 399  * that convert is really needed. */
 400 int ll_md_need_convert(struct ldlm_lock *lock)
 401 {
 402         struct ldlm_namespace *ns = ldlm_lock_to_ns(lock);
 403         struct inode *inode;
 404         __u64 wanted = lock->l_policy_data.l_inodebits.cancel_bits;
 405         __u64 bits = lock->l_policy_data.l_inodebits.bits & ~wanted;
 406         enum ldlm_mode mode = LCK_MINMODE;
 407
 408         if (!lock->l_conn_export ||
 409             !exp_connect_lock_convert(lock->l_conn_export))
 410                 return 0;
 411
 412         if (!wanted || !bits || ldlm_is_cancel(lock))
 413                 return 0;
 414
 415         /* do not convert locks other than DOM for now */
 416         if (!((bits | wanted) & MDS_INODELOCK_DOM))
 417                 return 0;
 418
 419         /* We may have already remaining bits in some other lock so
 420          * lock convert will leave us just extra lock for the same bit.
 421          * Check if client has other lock with the same bits and the same
 422          * or lower mode and don't convert if any.
 423          */
 424         switch (lock->l_req_mode) {
 425         case LCK_PR:
 426                 mode = LCK_PR;
 427                 fallthrough;
 428         case LCK_PW:
 429                 mode |= LCK_CR;
 430                 break;
 431         case LCK_CW:
 432                 mode = LCK_CW;
 433                 fallthrough;
 434         case LCK_CR:
 435                 mode |= LCK_CR;
 436                 break;
 437         default:
 438                 /* do not convert other modes */
 439                 return 0;
 440         }
 441
 442         /* is lock is too old to be converted? */
 443         lock_res_and_lock(lock);
 444         if (ktime_after(ktime_get(),
 445                         ktime_add(lock->l_last_used, ns->ns_dirty_age_limit))) {
 446                 unlock_res_and_lock(lock);
 447                 return 0;
 448         }
 449         unlock_res_and_lock(lock);
 450
 451         inode = ll_inode_from_resource_lock(lock);
 452         ll_have_md_lock(inode, &bits, mode);
 453         iput(inode);
 454         return !!(bits);
 455 }
 456
 457 int ll_md_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *ld,
 458                        void *data, int flag)
 459 {
 460         struct lustre_handle lockh;
 461         int rc;
 462
 463         ENTRY;
 464
 465         switch (flag) {
 466         case LDLM_CB_BLOCKING:
 467         {
 468                 __u64 cancel_flags = LCF_ASYNC;
 469
 470                 /* if lock convert is not needed then still have to
 471                  * pass lock via ldlm_cli_convert() to keep all states
 472                  * correct, set cancel_bits to full lock bits to cause
 473                  * full cancel to happen.
 474                  */
 475                 if (!ll_md_need_convert(lock)) {
 476                         lock_res_and_lock(lock);
 477                         lock->l_policy_data.l_inodebits.cancel_bits =
 478                                         lock->l_policy_data.l_inodebits.bits;
 479                         unlock_res_and_lock(lock);
 480                 }
 481                 rc = ldlm_cli_convert(lock, cancel_flags);
 482                 if (!rc)
 483                         RETURN(0);
 484                 /* continue with cancel otherwise */
 485                 ldlm_lock2handle(lock, &lockh);
 486                 rc = ldlm_cli_cancel(&lockh, cancel_flags);
 487                 if (rc < 0) {
 488                         CDEBUG(D_INODE, "ldlm_cli_cancel: rc = %d\n", rc);
 489                         RETURN(rc);
 490                 }
 491                 break;
 492         }
 493         case LDLM_CB_CANCELING:
 494         {
 495                 __u64 to_cancel = lock->l_policy_data.l_inodebits.bits;
 496
 497                 /* Nothing to do for non-granted locks */
 498                 if (!ldlm_is_granted(lock))
 499                         break;
 500
 501                 /* If 'ld' is supplied then bits to be cancelled are passed
 502                  * implicitly by lock converting and cancel_bits from 'ld'
 503                  * should be used. Otherwise full cancel is being performed
 504                  * and lock inodebits are used.
 505                  *
 506                  * Note: we cannot rely on cancel_bits in lock itself at this
 507                  * moment because they can be changed by concurrent thread,
 508                  * so ldlm_cli_inodebits_convert() pass cancel bits implicitly
 509                  * in 'ld' parameter.
 510                  */
 511                 if (ld) {
 512                         /* partial bits cancel allowed only during convert */
 513                         LASSERT(ldlm_is_converting(lock));
 514                         /* mask cancel bits by lock bits so only no any unused
 515                          * bits are passed to ll_lock_cancel_bits()
 516                          */
 517                         to_cancel &= ld->l_policy_data.l_inodebits.cancel_bits;
 518                 }
 519                 ll_lock_cancel_bits(lock, to_cancel);
 520                 break;
 521         }
 522         default:
 523                 LBUG();
 524         }
 525
 526         RETURN(0);
 527 }
 528
 529 __u32 ll_i2suppgid(struct inode *i)
 530 {
 531         if (in_group_p(i->i_gid))
 532                 return (__u32)from_kgid(&init_user_ns, i->i_gid);
 533         else
 534                 return (__u32) __kgid_val(INVALID_GID);
 535 }
 536
 537 /* Pack the required supplementary groups into the supplied groups array. */
 538 void ll_i2gids(__u32 *suppgids, struct inode *i1, struct inode *i2)
 539 {
 540         LASSERT(i1 != NULL);
 541         LASSERT(suppgids != NULL);
 542
 543         suppgids[0] = ll_i2suppgid(i1);
 544
 545         if (i2)
 546                 suppgids[1] = ll_i2suppgid(i2);
 547         else
 548                 suppgids[1] = -1;
 549 }
 550
 551 /*
 552  * try to reuse three types of dentry:
 553  * 1. unhashed alias, this one is unhashed by d_invalidate (but it may be valid
 554  *    by concurrent .revalidate).
 555  * 2. INVALID alias (common case for no valid ldlm lock held, but this flag may
 556  *    be cleared by others calling d_lustre_revalidate).
 557  * 3. DISCONNECTED alias.
 558  */
 559 static struct dentry *ll_find_alias(struct inode *inode, struct dentry *dentry)
 560 {
 561         struct dentry *alias, *discon_alias, *invalid_alias;
 562
 563         if (hlist_empty(&inode->i_dentry))
 564                 return NULL;
 565
 566         discon_alias = invalid_alias = NULL;
 567
 568         spin_lock(&inode->i_lock);
 569         hlist_for_each_entry(alias, &inode->i_dentry, d_alias) {
 570                 LASSERT(alias != dentry);
 571
 572                 spin_lock(&alias->d_lock);
 573                 if ((alias->d_flags & DCACHE_DISCONNECTED) &&
 574                     S_ISDIR(inode->i_mode))
 575                         /* LASSERT(last_discon == NULL); LU-405, bz 20055 */
 576                         discon_alias = alias;
 577                 else if (alias->d_parent == dentry->d_parent             &&
 578                          alias->d_name.hash == dentry->d_name.hash       &&
 579                          alias->d_name.len == dentry->d_name.len         &&
 580                          memcmp(alias->d_name.name, dentry->d_name.name,
 581                                 dentry->d_name.len) == 0)
 582                         invalid_alias = alias;
 583                 spin_unlock(&alias->d_lock);
 584
 585                 if (invalid_alias)
 586                         break;
 587         }
 588         alias = invalid_alias ?: discon_alias ?: NULL;
 589         if (alias) {
 590                 spin_lock(&alias->d_lock);
 591                 dget_dlock(alias);
 592                 spin_unlock(&alias->d_lock);
 593         }
 594         spin_unlock(&inode->i_lock);
 595
 596         return alias;
 597 }
 598
 599 /*
 600  * Similar to d_splice_alias(), but lustre treats invalid alias
 601  * similar to DCACHE_DISCONNECTED, and tries to use it anyway.
 602  */
 603 struct dentry *ll_splice_alias(struct inode *inode, struct dentry *de)
 604 {
 605         struct dentry *new;
 606
 607         if (inode) {
 608                 new = ll_find_alias(inode, de);
 609                 if (new) {
 610                         if (!ll_d_setup(new, true))
 611                                 return ERR_PTR(-ENOMEM);
 612                         d_move(new, de);
 613                         iput(inode);
 614                         CDEBUG(D_DENTRY,
 615                                "Reuse dentry %p inode %p refc %d flags %#x\n",
 616                               new, new->d_inode, ll_d_count(new), new->d_flags);
 617                         return new;
 618                 }
 619         }
 620         if (!ll_d_setup(de, false))
 621                 return ERR_PTR(-ENOMEM);
 622         d_add(de, inode);
 623
 624         /* this needs only to be done for foreign symlink dirs as
 625          * DCACHE_SYMLINK_TYPE is already set by d_flags_for_inode()
 626          * kernel routine for files with symlink ops (ie, real symlink)
 627          */
 628         if (inode && S_ISDIR(inode->i_mode) &&
 629             ll_sbi_has_foreign_symlink(ll_i2sbi(inode)) &&
 630 #ifdef HAVE_IOP_GET_LINK
 631             inode->i_op->get_link) {
 632 #else
 633             inode->i_op->follow_link) {
 634 #endif
 635                 CDEBUG(D_INFO, "%s: inode "DFID": faking foreign dir as a symlink\n",
 636                        ll_i2sbi(inode)->ll_fsname, PFID(ll_inode2fid(inode)));
 637                 spin_lock(&de->d_lock);
 638                 /* like d_flags_for_inode() already does for files */
 639                 de->d_flags = (de->d_flags & ~DCACHE_ENTRY_TYPE) |
 640                               DCACHE_SYMLINK_TYPE;
 641                 spin_unlock(&de->d_lock);
 642         }
 643
 644         CDEBUG(D_DENTRY, "Add dentry %p inode %p refc %d flags %#x\n",
 645                de, de->d_inode, ll_d_count(de), de->d_flags);
 646         return de;
 647 }
 648
 649 static int ll_lookup_it_finish(struct ptlrpc_request *request,
 650                                struct lookup_intent *it,
 651                                struct inode *parent, struct dentry **de,
 652                                void *secctx, __u32 secctxlen,
 653                                void *encctx, __u32 encctxlen,
 654                                ktime_t kstart, bool encrypt)
 655 {
 656         struct inode             *inode = NULL;
 657         __u64                     bits = 0;
 658         int                       rc;
 659         struct dentry *alias;
 660         ENTRY;
 661
 662         /* NB 1 request reference will be taken away by ll_intent_lock()
 663          * when I return */
 664         CDEBUG(D_DENTRY, "it %p it_disposition %x\n", it,
 665                it->it_disposition);
 666         if (!it_disposition(it, DISP_LOOKUP_NEG)) {
 667                 struct req_capsule *pill = &request->rq_pill;
 668                 struct mdt_body *body = req_capsule_server_get(pill,
 669                                                                &RMF_MDT_BODY);
 670
 671                 rc = ll_prep_inode(&inode, &request->rq_pill, (*de)->d_sb, it);
 672                 if (rc)
 673                         RETURN(rc);
 674
 675                 /* If encryption context was returned by MDT, put it in
 676                  * inode now to save an extra getxattr and avoid deadlock.
 677                  */
 678                 if (body->mbo_valid & OBD_MD_ENCCTX) {
 679                         encctx = req_capsule_server_get(pill, &RMF_FILE_ENCCTX);
 680                         encctxlen = req_capsule_get_size(pill,
 681                                                          &RMF_FILE_ENCCTX,
 682                                                          RCL_SERVER);
 683
 684                         if (encctxlen) {
 685                                 CDEBUG(D_SEC,
 686                                        "server returned encryption ctx for "DFID"\n",
 687                                        PFID(ll_inode2fid(inode)));
 688                                 rc = ll_xattr_cache_insert(inode,
 689                                                            xattr_for_enc(inode),
 690                                                            encctx, encctxlen);
 691                                 if (rc)
 692                                         CWARN("%s: cannot set enc ctx for "DFID": rc = %d\n",
 693                                               ll_i2sbi(inode)->ll_fsname,
 694                                               PFID(ll_inode2fid(inode)), rc);
 695                                 else if (encrypt) {
 696                                         rc = llcrypt_get_encryption_info(inode);
 697                                         if (rc)
 698                                                 CDEBUG(D_SEC,
 699                                                  "cannot get enc info for "DFID": rc = %d\n",
 700                                                  PFID(ll_inode2fid(inode)), rc);
 701                                 }
 702                         }
 703                 }
 704
 705                 ll_set_lock_data(ll_i2sbi(parent)->ll_md_exp, inode, it, &bits);
 706                 /* OPEN can return data if lock has DoM+LAYOUT bits set */
 707                 if (it->it_op & IT_OPEN &&
 708                     bits & MDS_INODELOCK_DOM && bits & MDS_INODELOCK_LAYOUT)
 709                         ll_dom_finish_open(inode, request);
 710
 711                 /* We used to query real size from OSTs here, but actually
 712                  * this is not needed. For stat() calls size would be updated
 713                  * from subsequent do_revalidate()->ll_inode_revalidate_it() in
 714                  * 2.4 and
 715                  * vfs_getattr_it->ll_getattr()->ll_inode_revalidate_it() in 2.6
 716                  * Everybody else who needs correct file size would call
 717                  * ll_glimpse_size or some equivalent themselves anyway.
 718                  * Also see bug 7198.
 719                  */
 720
 721                 /* If security context was returned by MDT, put it in
 722                  * inode now to save an extra getxattr from security hooks,
 723                  * and avoid deadlock.
 724                  */
 725                 if (body->mbo_valid & OBD_MD_SECCTX) {
 726                         secctx = req_capsule_server_get(pill, &RMF_FILE_SECCTX);
 727                         secctxlen = req_capsule_get_size(pill,
 728                                                            &RMF_FILE_SECCTX,
 729                                                            RCL_SERVER);
 730
 731                         if (secctxlen)
 732                                 CDEBUG(D_SEC, "server returned security context"
 733                                        " for "DFID"\n",
 734                                        PFID(ll_inode2fid(inode)));
 735                 }
 736
 737                 /* resume normally on error */
 738                 ll_inode_notifysecctx(inode, secctx, secctxlen);
 739         }
 740
 741         /* Only hash *de if it is unhashed (new dentry).
 742          * Atoimc_open may passin hashed dentries for open.
 743          */
 744         alias = ll_splice_alias(inode, *de);
 745         if (IS_ERR(alias))
 746                 GOTO(out, rc = PTR_ERR(alias));
 747
 748         *de = alias;
 749
 750         if (!it_disposition(it, DISP_LOOKUP_NEG)) {
 751                 /* We have the "lookup" lock, so unhide dentry */
 752                 if (bits & MDS_INODELOCK_LOOKUP) {
 753                         d_lustre_revalidate(*de);
 754                         ll_update_dir_depth(parent, (*de)->d_inode);
 755                 }
 756
 757                 if (encrypt) {
 758                         rc = llcrypt_get_encryption_info(inode);
 759                         if (rc)
 760                                 GOTO(out, rc);
 761                         if (!llcrypt_has_encryption_key(inode))
 762                                 GOTO(out, rc = -ENOKEY);
 763                 }
 764         } else if (!it_disposition(it, DISP_OPEN_CREATE)) {
 765                 /*
 766                  * If file was created on the server, the dentry is revalidated
 767                  * in ll_create_it if the lock allows for it.
 768                  */
 769                 /* Check that parent has UPDATE lock. */
 770                 struct lookup_intent parent_it = {
 771                                         .it_op = IT_GETATTR,
 772                                         .it_lock_handle = 0 };
 773                 struct ll_inode_info *lli = ll_i2info(parent);
 774                 struct lu_fid fid = lli->lli_fid;
 775
 776                 /* If it is striped directory, get the real stripe parent */
 777                 if (unlikely(ll_dir_striped(parent))) {
 778                         down_read(&lli->lli_lsm_sem);
 779                         rc = md_get_fid_from_lsm(ll_i2mdexp(parent),
 780                                                  lli->lli_lsm_md,
 781                                                  (*de)->d_name.name,
 782                                                  (*de)->d_name.len, &fid);
 783                         up_read(&lli->lli_lsm_sem);
 784                         if (rc != 0)
 785                                 GOTO(out, rc);
 786                 }
 787
 788                 if (md_revalidate_lock(ll_i2mdexp(parent), &parent_it, &fid,
 789                                        NULL)) {
 790                         d_lustre_revalidate(*de);
 791                         ll_intent_release(&parent_it);
 792                 }
 793         }
 794
 795         if (it_disposition(it, DISP_OPEN_CREATE)) {
 796                 ll_stats_ops_tally(ll_i2sbi(parent), LPROC_LL_MKNOD,
 797                                    ktime_us_delta(ktime_get(), kstart));
 798         }
 799
 800         GOTO(out, rc = 0);
 801
 802 out:
 803         if (rc != 0 && it->it_op & IT_OPEN) {
 804                 ll_intent_drop_lock(it);
 805                 ll_open_cleanup((*de)->d_sb, &request->rq_pill);
 806         }
 807
 808         return rc;
 809 }
 810
 811 static struct dentry *ll_lookup_it(struct inode *parent, struct dentry *dentry,
 812                                    struct lookup_intent *it,
 813                                    void **secctx, __u32 *secctxlen,
 814                                    struct pcc_create_attach *pca,
 815                                    bool encrypt,
 816                                    void **encctx, __u32 *encctxlen)
 817 {
 818         ktime_t kstart = ktime_get();
 819         struct lookup_intent lookup_it = { .it_op = IT_LOOKUP };
 820         struct dentry *save = dentry, *retval;
 821         struct ptlrpc_request *req = NULL;
 822         struct md_op_data *op_data = NULL;
 823         struct lov_user_md *lum = NULL;
 824         struct ll_sb_info *sbi = ll_i2sbi(parent);
 825         __u32 opc;
 826         int rc;
 827         struct llcrypt_name fname;
 828         struct lu_fid fid;
 829         ENTRY;
 830
 831         if (dentry->d_name.len > sbi->ll_namelen)
 832                 RETURN(ERR_PTR(-ENAMETOOLONG));
 833
 834         CDEBUG(D_VFSTRACE, "VFS Op:name=%pd, dir="DFID"(%p), intent=%s\n",
 835                dentry, PFID(ll_inode2fid(parent)), parent, LL_IT2STR(it));
 836
 837         if (d_mountpoint(dentry))
 838                 CERROR("Tell Peter, lookup on mtpt, it %s\n", LL_IT2STR(it));
 839
 840         if (it == NULL || it->it_op == IT_GETXATTR)
 841                 it = &lookup_it;
 842
 843         if (it->it_op == IT_GETATTR && dentry_may_statahead(parent, dentry)) {
 844                 rc = ll_revalidate_statahead(parent, &dentry, 0);
 845                 if (rc == 1)
 846                         RETURN(dentry == save ? NULL : dentry);
 847         }
 848
 849         if (it->it_op & IT_OPEN && it->it_flags & FMODE_WRITE &&
 850             dentry->d_sb->s_flags & SB_RDONLY)
 851                 RETURN(ERR_PTR(-EROFS));
 852
 853         if (it->it_op & IT_CREAT)
 854                 opc = LUSTRE_OPC_CREATE;
 855         else
 856                 opc = LUSTRE_OPC_LOOKUP;
 857
 858         /* Here we should be calling llcrypt_prepare_lookup(). But it installs a
 859          * custom ->d_revalidate() method, so we lose ll_d_ops.
 860          * To workaround this, call ll_setup_filename() and do the rest
 861          * manually. Also make a copy of llcrypt_d_revalidate() (unfortunately
 862          * not exported function) and call it from ll_revalidate_dentry(), to
 863          * ensure we do not cache stale dentries after a key has been added.
 864          */
 865         rc = ll_setup_filename(parent, &dentry->d_name, 1, &fname, &fid);
 866         if ((!rc || rc == -ENOENT) && fname.is_ciphertext_name) {
 867                 spin_lock(&dentry->d_lock);
 868                 dentry->d_flags |= DCACHE_NOKEY_NAME;
 869                 spin_unlock(&dentry->d_lock);
 870         }
 871         if (rc == -ENOENT)
 872                 RETURN(NULL);
 873         if (rc)
 874                 RETURN(ERR_PTR(rc));
 875
 876         op_data = ll_prep_md_op_data(NULL, parent, NULL, fname.disk_name.name,
 877                                      fname.disk_name.len, 0, opc, NULL);
 878         if (IS_ERR(op_data)) {
 879                 llcrypt_free_filename(&fname);
 880                 RETURN(ERR_CAST(op_data));
 881         }
 882         if (!fid_is_zero(&fid)) {
 883                 op_data->op_fid2 = fid;
 884                 op_data->op_bias = MDS_FID_OP;
 885                 if (it->it_op & IT_OPEN)
 886                         it->it_flags |= MDS_OPEN_BY_FID;
 887         }
 888
 889         /* enforce umask if acl disabled or MDS doesn't support umask */
 890         if (!IS_POSIXACL(parent) || !exp_connect_umask(ll_i2mdexp(parent)))
 891                 it->it_create_mode &= ~current_umask();
 892
 893         if (it->it_op & IT_CREAT &&
 894             test_bit(LL_SBI_FILE_SECCTX, sbi->ll_flags)) {
 895                 rc = ll_dentry_init_security(dentry, it->it_create_mode,
 896                                              &dentry->d_name,
 897                                              &op_data->op_file_secctx_name,
 898                                              &op_data->op_file_secctx_name_size,
 899                                              &op_data->op_file_secctx,
 900                                              &op_data->op_file_secctx_size);
 901                 if (rc < 0)
 902                         GOTO(out, retval = ERR_PTR(rc));
 903                 if (secctx != NULL)
 904                         *secctx = op_data->op_file_secctx;
 905                 if (secctxlen != NULL)
 906                         *secctxlen = op_data->op_file_secctx_size;
 907         } else {
 908                 if (secctx != NULL)
 909                         *secctx = NULL;
 910                 if (secctxlen != NULL)
 911                         *secctxlen = 0;
 912         }
 913         if (it->it_op & IT_CREAT && encrypt) {
 914                 if (unlikely(filename_is_volatile(dentry->d_name.name,
 915                                                   dentry->d_name.len, NULL))) {
 916                         /* get encryption context from reference file */
 917                         int ctx_size = LLCRYPT_ENC_CTX_SIZE;
 918                         struct lustre_sb_info *lsi;
 919                         struct file *ref_file;
 920                         struct inode *ref_inode;
 921                         void *ctx;
 922
 923                         rc = volatile_ref_file(dentry->d_name.name,
 924                                                dentry->d_name.len,
 925                                                &ref_file);
 926                         if (rc)
 927                                 GOTO(out, retval = ERR_PTR(rc));
 928
 929                         ref_inode = file_inode(ref_file);
 930                         if (!ref_inode) {
 931                                 fput(ref_file);
 932                                 GOTO(inherit, rc = -EINVAL);
 933                         }
 934
 935                         lsi = s2lsi(ref_inode->i_sb);
 936
 937 getctx:
 938                         OBD_ALLOC(ctx, ctx_size);
 939                         if (!ctx)
 940                                 GOTO(out, retval = ERR_PTR(-ENOMEM));
 941
 942 #ifdef CONFIG_LL_ENCRYPTION
 943                         rc = lsi->lsi_cop->get_context(ref_inode,
 944                                                        ctx, ctx_size);
 945 #elif defined(HAVE_LUSTRE_CRYPTO)
 946                         rc = ref_inode->i_sb->s_cop->get_context(ref_inode,
 947                                                                  ctx, ctx_size);
 948 #else
 949                         rc = -ENODATA;
 950 #endif
 951                         if (rc == -ERANGE) {
 952                                 OBD_FREE(ctx, ctx_size);
 953                                 ctx_size *= 2;
 954                                 goto getctx;
 955                         }
 956                         fput(ref_file);
 957                         if (rc < 0) {
 958                                 OBD_FREE(ctx, ctx_size);
 959                                 GOTO(inherit, rc);
 960                         }
 961
 962                         op_data->op_file_encctx_size = rc;
 963                         if (rc == ctx_size) {
 964                                 op_data->op_file_encctx = ctx;
 965                         } else {
 966                                 OBD_ALLOC(op_data->op_file_encctx,
 967                                           op_data->op_file_encctx_size);
 968                                 if (!op_data->op_file_encctx) {
 969                                         OBD_FREE(ctx, ctx_size);
 970                                         GOTO(out, retval = ERR_PTR(-ENOMEM));
 971                                 }
 972                                 memcpy(op_data->op_file_encctx, ctx,
 973                                        op_data->op_file_encctx_size);
 974                                 OBD_FREE(ctx, ctx_size);
 975                         }
 976                 } else {
 977 inherit:
 978                         rc = llcrypt_inherit_context(parent, NULL, op_data,
 979                                                      false);
 980                         if (rc)
 981                                 GOTO(out, retval = ERR_PTR(rc));
 982                 }
 983                 if (encctx != NULL)
 984                         *encctx = op_data->op_file_encctx;
 985                 if (encctxlen != NULL)
 986                         *encctxlen = op_data->op_file_encctx_size;
 987         } else {
 988                 if (encctx != NULL)
 989                         *encctx = NULL;
 990                 if (encctxlen != NULL)
 991                         *encctxlen = 0;
 992         }
 993
 994         /* ask for security context upon intent:
 995          * get name of security xattr to request to server
 996          */
 997         if (it->it_op & (IT_LOOKUP | IT_GETATTR | IT_OPEN))
 998                 op_data->op_file_secctx_name_size =
 999                         ll_secctx_name_get(sbi, &op_data->op_file_secctx_name);
1000
1001         if (pca && pca->pca_dataset) {
1002                 OBD_ALLOC_PTR(lum);
1003                 if (lum == NULL)
1004                         GOTO(out, retval = ERR_PTR(-ENOMEM));
1005
1006                 lum->lmm_magic = LOV_USER_MAGIC_V1;
1007                 lum->lmm_pattern = LOV_PATTERN_F_RELEASED | LOV_PATTERN_RAID0;
1008                 op_data->op_data = lum;
1009                 op_data->op_data_size = sizeof(*lum);
1010                 op_data->op_archive_id = pca->pca_dataset->pccd_rwid;
1011                 it->it_flags |= MDS_OPEN_PCC;
1012         }
1013
1014         rc = md_intent_lock(ll_i2mdexp(parent), op_data, it, &req,
1015                             &ll_md_blocking_ast, 0);
1016         /* If the MDS allows the client to chgrp (CFS_SETGRP_PERM), but the
1017          * client does not know which suppgid should be sent to the MDS, or
1018          * some other(s) changed the target file's GID after this RPC sent
1019          * to the MDS with the suppgid as the original GID, then we should
1020          * try again with right suppgid. */
1021         if (rc == -EACCES && it->it_op & IT_OPEN &&
1022             it_disposition(it, DISP_OPEN_DENY)) {
1023                 struct mdt_body *body;
1024
1025                 LASSERT(req != NULL);
1026
1027                 body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY);
1028                 if (op_data->op_suppgids[0] == body->mbo_gid ||
1029                     op_data->op_suppgids[1] == body->mbo_gid ||
1030                     !in_group_p(make_kgid(&init_user_ns, body->mbo_gid)))
1031                         GOTO(out, retval = ERR_PTR(-EACCES));
1032
1033                 fid_zero(&op_data->op_fid2);
1034                 op_data->op_suppgids[1] = body->mbo_gid;
1035                 ptlrpc_req_finished(req);
1036                 req = NULL;
1037                 ll_intent_release(it);
1038                 rc = md_intent_lock(ll_i2mdexp(parent), op_data, it, &req,
1039                                     &ll_md_blocking_ast, 0);
1040         }
1041
1042         if (rc < 0)
1043                 GOTO(out, retval = ERR_PTR(rc));
1044
1045         if (pca && pca->pca_dataset) {
1046                 rc = pcc_inode_create(parent->i_sb, pca->pca_dataset,
1047                                       &op_data->op_fid2,
1048                                       &pca->pca_dentry);
1049                 if (rc)
1050                         GOTO(out, retval = ERR_PTR(rc));
1051         }
1052
1053         /* dir layout may change */
1054         ll_unlock_md_op_lsm(op_data);
1055         rc = ll_lookup_it_finish(req, it, parent, &dentry,
1056                                  secctx != NULL ? *secctx : NULL,
1057                                  secctxlen != NULL ? *secctxlen : 0,
1058                                  encctx != NULL ? *encctx : NULL,
1059                                  encctxlen != NULL ? *encctxlen : 0,
1060                                  kstart, encrypt);
1061         if (rc != 0) {
1062                 ll_intent_release(it);
1063                 GOTO(out, retval = ERR_PTR(rc));
1064         }
1065
1066         if ((it->it_op & IT_OPEN) && dentry->d_inode &&
1067             !S_ISREG(dentry->d_inode->i_mode) &&
1068             !S_ISDIR(dentry->d_inode->i_mode)) {
1069                 ll_release_openhandle(dentry, it);
1070         }
1071         ll_lookup_finish_locks(it, dentry);
1072
1073         GOTO(out, retval = (dentry == save) ? NULL : dentry);
1074
1075 out:
1076         if (op_data != NULL && !IS_ERR(op_data)) {
1077                 if (secctx != NULL && secctxlen != NULL) {
1078                         /* caller needs sec ctx info, so reset it in op_data to
1079                          * prevent it from being freed */
1080                         op_data->op_file_secctx = NULL;
1081                         op_data->op_file_secctx_size = 0;
1082                 }
1083                 if (encctx != NULL && encctxlen != NULL &&
1084                     it->it_op & IT_CREAT && encrypt) {
1085                         /* caller needs enc ctx info, so reset it in op_data to
1086                          * prevent it from being freed
1087                          */
1088                         op_data->op_file_encctx = NULL;
1089                         op_data->op_file_encctx_size = 0;
1090                 }
1091                 llcrypt_free_filename(&fname);
1092                 ll_finish_md_op_data(op_data);
1093         }
1094
1095         if (lum != NULL)
1096                 OBD_FREE_PTR(lum);
1097
1098         ptlrpc_req_finished(req);
1099         return retval;
1100 }
1101
1102 static struct dentry *ll_lookup_nd(struct inode *parent, struct dentry *dentry,
1103                                    unsigned int flags)
1104 {
1105         struct lookup_intent *itp, it = { .it_op = IT_GETATTR };
1106         struct dentry *de;
1107
1108         CDEBUG(D_VFSTRACE, "VFS Op:name=%pd, dir="DFID"(%p), flags=%u\n",
1109                dentry, PFID(ll_inode2fid(parent)), parent, flags);
1110
1111         /*
1112          * Optimize away (CREATE && !OPEN). Let .create handle the race.
1113          * but only if we have write permissions there, otherwise we need
1114          * to proceed with lookup. LU-4185
1115          */
1116         if ((flags & LOOKUP_CREATE) && !(flags & LOOKUP_OPEN) &&
1117             (inode_permission(&init_user_ns,
1118                               parent, MAY_WRITE | MAY_EXEC) == 0))
1119                 return NULL;
1120
1121         if (flags & (LOOKUP_PARENT|LOOKUP_OPEN|LOOKUP_CREATE))
1122                 itp = NULL;
1123         else
1124                 itp = &it;
1125         de = ll_lookup_it(parent, dentry, itp, NULL, NULL, NULL, false,
1126                           NULL, NULL);
1127
1128         if (itp != NULL)
1129                 ll_intent_release(itp);
1130
1131         return de;
1132 }
1133
1134 #ifdef FMODE_CREATED /* added in Linux v4.18-rc1-20-g73a09dd */
1135 # define ll_is_opened(o, f)             ((f)->f_mode & FMODE_OPENED)
1136 # define ll_finish_open(f, d, o)        finish_open((f), (d), NULL)
1137 # define ll_last_arg
1138 # define ll_set_created(o, f)                                           \
1139 do {                                                                    \
1140         (f)->f_mode |= FMODE_CREATED;                                   \
1141 } while (0)
1142
1143 #else
1144 # define ll_is_opened(o, f)             (*(o))
1145 # define ll_finish_open(f, d, o)        finish_open((f), (d), NULL, (o))
1146 # define ll_last_arg                    , int *opened
1147 # define ll_set_created(o, f)                                           \
1148 do {                                                                    \
1149         *(o) |= FILE_CREATED;                                           \
1150 } while (0)
1151
1152 #endif
1153
1154 /*
1155  * For cached negative dentry and new dentry, handle lookup/create/open
1156  * together.
1157  */
1158 static int ll_atomic_open(struct inode *dir, struct dentry *dentry,
1159                           struct file *file, unsigned open_flags,
1160                           umode_t mode ll_last_arg)
1161 {
1162         struct lookup_intent *it;
1163         struct dentry *de;
1164         long long lookup_flags = LOOKUP_OPEN;
1165         void *secctx = NULL;
1166         __u32 secctxlen = 0;
1167         void *encctx = NULL;
1168         __u32 encctxlen = 0;
1169         struct ll_sb_info *sbi = NULL;
1170         struct pcc_create_attach pca = { NULL, NULL };
1171         bool encrypt = false;
1172         int rc = 0;
1173         ENTRY;
1174
1175         CDEBUG(D_VFSTRACE,
1176                "VFS Op:name=%pd, dir="DFID"(%p), file %p, open_flags %x, mode %x opened %d\n",
1177                dentry, PFID(ll_inode2fid(dir)), dir, file, open_flags, mode,
1178                ll_is_opened(opened, file));
1179
1180         /* Only negative dentries enter here */
1181         LASSERT(dentry->d_inode == NULL);
1182
1183         if (!d_unhashed(dentry)) {
1184                 /* A valid negative dentry that just passed revalidation,
1185                  * there's little point to try and open it server-side,
1186                  * even though there's a minuscule chance it might succeed.
1187                  * Either way it's a valid race to just return -ENOENT here.
1188                  */
1189                 if (!(open_flags & O_CREAT))
1190                         return -ENOENT;
1191
1192                 /* Otherwise we just unhash it to be rehashed afresh via
1193                  * lookup if necessary
1194                  */
1195                 d_drop(dentry);
1196         }
1197
1198         OBD_ALLOC(it, sizeof(*it));
1199         if (!it)
1200                 RETURN(-ENOMEM);
1201
1202         it->it_op = IT_OPEN;
1203         if (open_flags & O_CREAT) {
1204                 it->it_op |= IT_CREAT;
1205                 lookup_flags |= LOOKUP_CREATE;
1206                 sbi = ll_i2sbi(dir);
1207                 /* Volatile file is used for HSM restore, so do not use PCC */
1208                 if (!filename_is_volatile(dentry->d_name.name,
1209                                           dentry->d_name.len, NULL)) {
1210                         struct pcc_matcher item;
1211                         struct pcc_dataset *dataset;
1212
1213                         item.pm_uid = from_kuid(&init_user_ns, current_uid());
1214                         item.pm_gid = from_kgid(&init_user_ns, current_gid());
1215                         item.pm_projid = ll_i2info(dir)->lli_projid;
1216                         item.pm_name = &dentry->d_name;
1217                         dataset = pcc_dataset_match_get(&sbi->ll_pcc_super,
1218                                                         &item);
1219                         pca.pca_dataset = dataset;
1220                 }
1221         }
1222         it->it_create_mode = (mode & S_IALLUGO) | S_IFREG;
1223         it->it_flags = (open_flags & ~O_ACCMODE) | OPEN_FMODE(open_flags);
1224         it->it_flags &= ~MDS_OPEN_FL_INTERNAL;
1225
1226         if (ll_sbi_has_encrypt(ll_i2sbi(dir)) && IS_ENCRYPTED(dir)) {
1227                 /* in case of create, this is going to be a regular file because
1228                  * we set S_IFREG bit on it->it_create_mode above
1229                  */
1230                 rc = llcrypt_get_encryption_info(dir);
1231                 if (rc)
1232                         GOTO(out_release, rc);
1233                 if (open_flags & O_CREAT) {
1234                         /* For migration or mirroring without enc key, we still
1235                          * need to be able to create a volatile file.
1236                          */
1237                         if (!llcrypt_has_encryption_key(dir) &&
1238                             (!filename_is_volatile(dentry->d_name.name,
1239                                                    dentry->d_name.len, NULL) ||
1240                             (open_flags & O_FILE_ENC) != O_FILE_ENC ||
1241                             !(open_flags & O_DIRECT)))
1242                                 GOTO(out_release, rc = -ENOKEY);
1243                         encrypt = true;
1244                 }
1245         }
1246
1247         OBD_FAIL_TIMEOUT(OBD_FAIL_LLITE_CREATE_FILE_PAUSE2, cfs_fail_val);
1248
1249         /* We can only arrive at this path when we have no inode, so
1250          * we only need to request open lock if it was requested
1251          * for every open
1252          */
1253         if (ll_i2sbi(dir)->ll_oc_thrsh_count == 1 &&
1254             exp_connect_flags2(ll_i2mdexp(dir)) &
1255             OBD_CONNECT2_ATOMIC_OPEN_LOCK)
1256                 it->it_flags |= MDS_OPEN_LOCK;
1257
1258         /* Dentry added to dcache tree in ll_lookup_it */
1259         de = ll_lookup_it(dir, dentry, it, &secctx, &secctxlen, &pca, encrypt,
1260                           &encctx, &encctxlen);
1261         if (IS_ERR(de))
1262                 rc = PTR_ERR(de);
1263         else if (de != NULL)
1264                 dentry = de;
1265
1266         CFS_FAIL_TIMEOUT(OBD_FAIL_LLITE_CREATE_FILE_PAUSE, cfs_fail_val);
1267
1268         if (!rc) {
1269                 if (it_disposition(it, DISP_OPEN_CREATE)) {
1270                         /* Dentry instantiated in ll_create_it. */
1271                         rc = ll_create_it(dir, dentry, it, secctx, secctxlen,
1272                                           encrypt, encctx, encctxlen,
1273                                           open_flags);
1274                         ll_security_release_secctx(secctx, secctxlen);
1275                         llcrypt_free_ctx(encctx, encctxlen);
1276                         if (rc) {
1277                                 /* We dget in ll_splice_alias. */
1278                                 if (de != NULL)
1279                                         dput(de);
1280                                 goto out_release;
1281                         }
1282
1283                         rc = pcc_inode_create_fini(dentry->d_inode, &pca);
1284                         if (rc) {
1285                                 if (de != NULL)
1286                                         dput(de);
1287                                 GOTO(out_release, rc);
1288                         }
1289
1290                         ll_set_created(opened, file);
1291                 } else {
1292                         /* Open the file with O_CREAT, but the file already
1293                          * existed on MDT. This may happend in the case that
1294                          * the LOOKUP ibits lock is revoked and the
1295                          * corresponding dentry cache is deleted.
1296                          * i.e. In the current Lustre, the truncate operation
1297                          * will revoke the LOOKUP ibits lock, and the file
1298                          * dentry cache will be invalidated. The following open
1299                          * with O_CREAT flag will call into ->atomic_open, the
1300                          * file was wrongly though as newly created file and
1301                          * try to auto cache the file. So after client knows it
1302                          * is not a DISP_OPEN_CREATE, it should cleanup the
1303                          * already created PCC copy.
1304                          */
1305                         pcc_create_attach_cleanup(dir->i_sb, &pca);
1306
1307                         if (open_flags & O_CREAT && encrypt &&
1308                             dentry->d_inode) {
1309                                 rc = ll_set_encflags(dentry->d_inode, encctx,
1310                                                      encctxlen, true);
1311                                 llcrypt_free_ctx(encctx, encctxlen);
1312                                 if (rc)
1313                                         GOTO(out_release, rc);
1314                         }
1315                 }
1316
1317                 /* check also if a foreign file is openable */
1318                 if (dentry->d_inode && it_disposition(it, DISP_OPEN_OPEN) &&
1319                     ll_foreign_is_openable(dentry, open_flags)) {
1320                         /* Open dentry. */
1321                         if (S_ISFIFO(dentry->d_inode->i_mode)) {
1322                                 /* We cannot call open here as it might
1323                                  * deadlock. This case is unreachable in
1324                                  * practice because of OBD_CONNECT_NODEVOH. */
1325                                 rc = finish_no_open(file, de);
1326                         } else {
1327                                 file->private_data = it;
1328                                 rc = ll_finish_open(file, dentry, opened);
1329                                 /* We dget in ll_splice_alias. finish_open takes
1330                                  * care of dget for fd open.
1331                                  */
1332                                 if (de != NULL)
1333                                         dput(de);
1334                         }
1335                 } else {
1336                         rc = finish_no_open(file, de);
1337                 }
1338         } else {
1339                 pcc_create_attach_cleanup(dir->i_sb, &pca);
1340         }
1341
1342 out_release:
1343         ll_intent_release(it);
1344         OBD_FREE(it, sizeof(*it));
1345
1346         RETURN(rc);
1347 }
1348
1349 /* We depend on "mode" being set with the proper file type/umask by now */
1350 static struct inode *ll_create_node(struct inode *dir, struct lookup_intent *it)
1351 {
1352         struct inode *inode = NULL;
1353         struct ptlrpc_request *request = NULL;
1354         struct ll_sb_info *sbi = ll_i2sbi(dir);
1355         int rc;
1356         ENTRY;
1357
1358         LASSERT(it && it->it_disposition);
1359
1360         LASSERT(it_disposition(it, DISP_ENQ_CREATE_REF));
1361         request = it->it_request;
1362         it_clear_disposition(it, DISP_ENQ_CREATE_REF);
1363         rc = ll_prep_inode(&inode, &request->rq_pill, dir->i_sb, it);
1364         if (rc)
1365                 GOTO(out, inode = ERR_PTR(rc));
1366
1367         /* Pause to allow for a race with concurrent access by fid */
1368         OBD_FAIL_TIMEOUT(OBD_FAIL_LLITE_CREATE_NODE_PAUSE, cfs_fail_val);
1369
1370         /* We asked for a lock on the directory, but were granted a
1371          * lock on the inode.  Since we finally have an inode pointer,
1372          * stuff it in the lock. */
1373         CDEBUG(D_DLMTRACE, "setting l_ast_data to inode "DFID"(%p)\n",
1374                PFID(ll_inode2fid(inode)), inode);
1375         ll_set_lock_data(sbi->ll_md_exp, inode, it, NULL);
1376         EXIT;
1377  out:
1378         ptlrpc_req_finished(request);
1379         return inode;
1380 }
1381
1382 /*
1383  * By the time this is called, we already have created the directory cache
1384  * entry for the new file, but it is so far negative - it has no inode.
1385  *
1386  * We defer creating the OBD object(s) until open, to keep the intent and
1387  * non-intent code paths similar, and also because we do not have the MDS
1388  * inode number before calling ll_create_node() (which is needed for LOV),
1389  * so we would need to do yet another RPC to the MDS to store the LOV EA
1390  * data on the MDS.  If needed, we would pass the PACKED lmm as data and
1391  * lmm_size in datalen (the MDS still has code which will handle that).
1392  *
1393  * If the create succeeds, we fill in the inode information
1394  * with d_instantiate().
1395  */
1396 static int ll_create_it(struct inode *dir, struct dentry *dentry,
1397                         struct lookup_intent *it,
1398                         void *secctx, __u32 secctxlen, bool encrypt,
1399                         void *encctx, __u32 encctxlen, unsigned int open_flags)
1400 {
1401         struct inode *inode;
1402         __u64 bits = 0;
1403         int rc = 0;
1404         ENTRY;
1405
1406         CDEBUG(D_VFSTRACE, "VFS Op:name=%pd, dir="DFID"(%p), intent=%s\n",
1407                dentry, PFID(ll_inode2fid(dir)), dir, LL_IT2STR(it));
1408
1409         rc = it_open_error(DISP_OPEN_CREATE, it);
1410         if (rc)
1411                 RETURN(rc);
1412
1413         inode = ll_create_node(dir, it);
1414         if (IS_ERR(inode))
1415                 RETURN(PTR_ERR(inode));
1416
1417         /* must be done before d_instantiate, because it calls
1418          * security_d_instantiate, which means a getxattr if security
1419          * context is not set yet
1420          */
1421         rc = ll_inode_notifysecctx(inode, secctx, secctxlen);
1422         if (rc)
1423                 RETURN(rc);
1424
1425         d_instantiate(dentry, inode);
1426
1427         if (encrypt) {
1428                 bool preload = true;
1429
1430                 /* For migration or mirroring without enc key, we
1431                  * create a volatile file without enc context.
1432                  */
1433                 if (!llcrypt_has_encryption_key(dir) &&
1434                     filename_is_volatile(dentry->d_name.name,
1435                                          dentry->d_name.len, NULL) &&
1436                     (open_flags & O_FILE_ENC) == O_FILE_ENC &&
1437                     open_flags & O_DIRECT)
1438                         preload = false;
1439                 rc = ll_set_encflags(inode, encctx, encctxlen, preload);
1440                 if (rc)
1441                         RETURN(rc);
1442         }
1443
1444         if (!test_bit(LL_SBI_FILE_SECCTX, ll_i2sbi(inode)->ll_flags)) {
1445                 rc = ll_inode_init_security(dentry, inode, dir);
1446                 if (rc)
1447                         RETURN(rc);
1448         }
1449
1450         ll_set_lock_data(ll_i2sbi(dir)->ll_md_exp, inode, it, &bits);
1451         if (bits & MDS_INODELOCK_LOOKUP) {
1452                 d_lustre_revalidate(dentry);
1453                 ll_update_dir_depth(dir, inode);
1454         }
1455
1456         RETURN(0);
1457 }
1458
1459 void ll_update_times(struct ptlrpc_request *request, struct inode *inode)
1460 {
1461         struct mdt_body *body = req_capsule_server_get(&request->rq_pill,
1462                                                        &RMF_MDT_BODY);
1463
1464         LASSERT(body);
1465         if (body->mbo_valid & OBD_MD_FLMTIME &&
1466             body->mbo_mtime > inode->i_mtime.tv_sec) {
1467                 CDEBUG(D_INODE,
1468                        "setting fid " DFID " mtime from %lld to %llu\n",
1469                        PFID(ll_inode2fid(inode)),
1470                        (s64)inode->i_mtime.tv_sec, body->mbo_mtime);
1471                 inode->i_mtime.tv_sec = body->mbo_mtime;
1472         }
1473
1474         if (body->mbo_valid & OBD_MD_FLCTIME &&
1475             body->mbo_ctime > inode->i_ctime.tv_sec)
1476                 inode->i_ctime.tv_sec = body->mbo_ctime;
1477 }
1478
1479 /* once default LMV (space balanced) is set on ROOT, it should take effect if
1480  * default LMV is not set on parent directory.
1481  */
1482 static void ll_qos_mkdir_prep(struct md_op_data *op_data, struct inode *dir)
1483 {
1484         struct inode *root = dir->i_sb->s_root->d_inode;
1485         struct ll_inode_info *rlli = ll_i2info(root);
1486         struct ll_inode_info *lli = ll_i2info(dir);
1487         struct lmv_stripe_md *lsm;
1488
1489         op_data->op_dir_depth = lli->lli_inherit_depth ?: lli->lli_dir_depth;
1490
1491         /* parent directory is striped */
1492         if (unlikely(lli->lli_lsm_md))
1493                 return;
1494
1495         /* default LMV set on parent directory */
1496         if (unlikely(lli->lli_default_lsm_md))
1497                 return;
1498
1499         /* parent is ROOT */
1500         if (unlikely(dir == root))
1501                 return;
1502
1503         /* default LMV not set on ROOT */
1504         if (!rlli->lli_default_lsm_md)
1505                 return;
1506
1507         down_read(&rlli->lli_lsm_sem);
1508         lsm = rlli->lli_default_lsm_md;
1509         if (!lsm)
1510                 goto unlock;
1511
1512         /* not space balanced */
1513         if (lsm->lsm_md_master_mdt_index != LMV_OFFSET_DEFAULT)
1514                 goto unlock;
1515
1516         if (lsm->lsm_md_max_inherit != LMV_INHERIT_NONE &&
1517             (lsm->lsm_md_max_inherit == LMV_INHERIT_UNLIMITED ||
1518              lsm->lsm_md_max_inherit >= lli->lli_dir_depth)) {
1519                 op_data->op_flags |= MF_QOS_MKDIR;
1520                 if (lsm->lsm_md_max_inherit_rr != LMV_INHERIT_RR_NONE &&
1521                     (lsm->lsm_md_max_inherit_rr == LMV_INHERIT_RR_UNLIMITED ||
1522                      lsm->lsm_md_max_inherit_rr >= lli->lli_dir_depth))
1523                         op_data->op_flags |= MF_RR_MKDIR;
1524                 CDEBUG(D_INODE, DFID" requests qos mkdir %#x\n",
1525                        PFID(&lli->lli_fid), op_data->op_flags);
1526         }
1527 unlock:
1528         up_read(&rlli->lli_lsm_sem);
1529 }
1530
1531 static int ll_new_node(struct inode *dir, struct dentry *dchild,
1532                        const char *tgt, umode_t mode, __u64 rdev, __u32 opc)
1533 {
1534         struct qstr *name = &dchild->d_name;
1535         struct ptlrpc_request *request = NULL;
1536         struct md_op_data *op_data = NULL;
1537         struct inode *inode = NULL;
1538         struct ll_sb_info *sbi = ll_i2sbi(dir);
1539         struct llcrypt_str *disk_link = NULL;
1540         bool encrypt = false;
1541         int err;
1542
1543         ENTRY;
1544         if (unlikely(tgt != NULL)) {
1545                 disk_link = (struct llcrypt_str *)rdev;
1546                 rdev = 0;
1547                 if (!disk_link)
1548                         RETURN(-EINVAL);
1549         }
1550
1551 again:
1552         op_data = ll_prep_md_op_data(NULL, dir, NULL, name->name,
1553                                      name->len, 0, opc, NULL);
1554         if (IS_ERR(op_data))
1555                 GOTO(err_exit, err = PTR_ERR(op_data));
1556
1557         if (S_ISDIR(mode))
1558                 ll_qos_mkdir_prep(op_data, dir);
1559
1560         if (test_bit(LL_SBI_FILE_SECCTX, sbi->ll_flags)) {
1561                 err = ll_dentry_init_security(dchild, mode, &dchild->d_name,
1562                                               &op_data->op_file_secctx_name,
1563                                               &op_data->op_file_secctx_name_size,
1564                                               &op_data->op_file_secctx,
1565                                               &op_data->op_file_secctx_size);
1566                 if (err < 0)
1567                         GOTO(err_exit, err);
1568         }
1569
1570         if (ll_sbi_has_encrypt(sbi) &&
1571             ((IS_ENCRYPTED(dir) &&
1572             (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode))) ||
1573              (unlikely(ll_sb_has_test_dummy_encryption(dir->i_sb)) &&
1574               S_ISDIR(mode)))) {
1575                 err = llcrypt_get_encryption_info(dir);
1576                 if (err)
1577                         GOTO(err_exit, err);
1578                 if (!llcrypt_has_encryption_key(dir))
1579                         GOTO(err_exit, err = -ENOKEY);
1580                 encrypt = true;
1581         }
1582
1583         if (encrypt) {
1584                 err = llcrypt_inherit_context(dir, NULL, op_data, false);
1585                 if (err)
1586                         GOTO(err_exit, err);
1587
1588                 if (S_ISLNK(mode)) {
1589                         /* llcrypt needs inode to encrypt target name, so create
1590                          * a fake inode and associate encryption context got
1591                          * from llcrypt_inherit_context.
1592                          */
1593                         struct inode *fakeinode =
1594                                 dchild->d_sb->s_op->alloc_inode(dchild->d_sb);
1595
1596                         if (!fakeinode)
1597                                 GOTO(err_exit, err = -ENOMEM);
1598                         fakeinode->i_sb = dchild->d_sb;
1599                         fakeinode->i_mode |= S_IFLNK;
1600 #ifdef IOP_XATTR
1601                         fakeinode->i_opflags |= IOP_XATTR;
1602 #endif
1603                         ll_lli_init(ll_i2info(fakeinode));
1604                         err = ll_set_encflags(fakeinode,
1605                                               op_data->op_file_encctx,
1606                                               op_data->op_file_encctx_size,
1607                                               true);
1608                         if (!err)
1609                                 err = __llcrypt_encrypt_symlink(fakeinode, tgt,
1610                                                                 strlen(tgt),
1611                                                                 disk_link);
1612
1613                         ll_xattr_cache_destroy(fakeinode);
1614                         llcrypt_put_encryption_info(fakeinode);
1615                         dchild->d_sb->s_op->destroy_inode(fakeinode);
1616                         if (err)
1617                                 GOTO(err_exit, err);
1618                 }
1619         }
1620
1621         err = md_create(sbi->ll_md_exp, op_data, tgt ? disk_link->name : NULL,
1622                         tgt ? disk_link->len : 0, mode,
1623                         from_kuid(&init_user_ns, current_fsuid()),
1624                         from_kgid(&init_user_ns, current_fsgid()),
1625                         current_cap(), rdev, &request);
1626 #if LUSTRE_VERSION_CODE < OBD_OCD_VERSION(2, 17, 58, 0)
1627         /*
1628          * server < 2.12.58 doesn't pack default LMV in intent_getattr reply,
1629          * fetch default LMV here.
1630          */
1631         if (unlikely(err == -EREMOTE)) {
1632                 struct ll_inode_info    *lli = ll_i2info(dir);
1633                 struct lmv_user_md      *lum;
1634                 int                     lumsize;
1635                 int                     err2;
1636
1637                 ptlrpc_req_finished(request);
1638                 request = NULL;
1639                 ll_finish_md_op_data(op_data);
1640                 op_data = NULL;
1641
1642                 err2 = ll_dir_getstripe(dir, (void **)&lum, &lumsize, &request,
1643                                         OBD_MD_DEFAULT_MEA);
1644                 if (err2 == 0) {
1645                         struct lustre_md md = { NULL };
1646
1647                         md.body = req_capsule_server_get(&request->rq_pill,
1648                                                          &RMF_MDT_BODY);
1649                         if (!md.body)
1650                                 GOTO(err_exit, err = -EPROTO);
1651
1652                         OBD_ALLOC_PTR(md.default_lmv);
1653                         if (!md.default_lmv)
1654                                 GOTO(err_exit, err = -ENOMEM);
1655
1656                         md.default_lmv->lsm_md_magic = lum->lum_magic;
1657                         md.default_lmv->lsm_md_stripe_count =
1658                                 lum->lum_stripe_count;
1659                         md.default_lmv->lsm_md_master_mdt_index =
1660                                 lum->lum_stripe_offset;
1661                         md.default_lmv->lsm_md_hash_type = lum->lum_hash_type;
1662                         md.default_lmv->lsm_md_max_inherit =
1663                                 lum->lum_max_inherit;
1664                         md.default_lmv->lsm_md_max_inherit_rr =
1665                                 lum->lum_max_inherit_rr;
1666
1667                         err = ll_update_inode(dir, &md);
1668                         md_free_lustre_md(sbi->ll_md_exp, &md);
1669                         if (err)
1670                                 GOTO(err_exit, err);
1671                 } else if (err2 == -ENODATA && lli->lli_default_lsm_md) {
1672                         /*
1673                          * If there are no default stripe EA on the MDT, but the
1674                          * client has default stripe, then it probably means
1675                          * default stripe EA has just been deleted.
1676                          */
1677                         down_write(&lli->lli_lsm_sem);
1678                         if (lli->lli_default_lsm_md)
1679                                 OBD_FREE_PTR(lli->lli_default_lsm_md);
1680                         lli->lli_default_lsm_md = NULL;
1681                         up_write(&lli->lli_lsm_sem);
1682                 } else {
1683                         GOTO(err_exit, err);
1684                 }
1685
1686                 ptlrpc_req_finished(request);
1687                 request = NULL;
1688                 goto again;
1689         }
1690 #endif
1691
1692         if (err < 0)
1693                 GOTO(err_exit, err);
1694
1695         ll_update_times(request, dir);
1696
1697         CFS_FAIL_TIMEOUT(OBD_FAIL_LLITE_NEWNODE_PAUSE, cfs_fail_val);
1698
1699         err = ll_prep_inode(&inode, &request->rq_pill, dchild->d_sb, NULL);
1700         if (err)
1701                 GOTO(err_exit, err);
1702
1703         /* must be done before d_instantiate, because it calls
1704          * security_d_instantiate, which means a getxattr if security
1705          * context is not set yet
1706          */
1707         err = ll_inode_notifysecctx(inode,
1708                                     op_data->op_file_secctx,
1709                                     op_data->op_file_secctx_size);
1710         if (err)
1711                 GOTO(err_exit, err);
1712
1713         d_instantiate(dchild, inode);
1714
1715         if (encrypt) {
1716                 err = ll_set_encflags(inode, op_data->op_file_encctx,
1717                                       op_data->op_file_encctx_size, true);
1718                 if (err)
1719                         GOTO(err_exit, err);
1720
1721                 if (S_ISLNK(mode)) {
1722                         struct ll_inode_info *lli = ll_i2info(inode);
1723
1724                         /* Cache the plaintext symlink target
1725                          * for later use by get_link()
1726                          */
1727                         OBD_ALLOC(lli->lli_symlink_name, strlen(tgt) + 1);
1728                         /* do not return an error if we cannot
1729                          * cache the symlink locally
1730                          */
1731                         if (lli->lli_symlink_name)
1732                                 memcpy(lli->lli_symlink_name,
1733                                        tgt, strlen(tgt) + 1);
1734                 }
1735         }
1736
1737         if (!test_bit(LL_SBI_FILE_SECCTX, sbi->ll_flags)) {
1738                 err = ll_inode_init_security(dchild, inode, dir);
1739                 if (err)
1740                         GOTO(err_exit, err);
1741         }
1742
1743         EXIT;
1744 err_exit:
1745         if (request != NULL)
1746                 ptlrpc_req_finished(request);
1747
1748         if (!IS_ERR_OR_NULL(op_data))
1749                 ll_finish_md_op_data(op_data);
1750
1751         RETURN(err);
1752 }
1753
1754 static int ll_mknod(struct user_namespace *mnt_userns, struct inode *dir,
1755                     struct dentry *dchild, umode_t mode, dev_t rdev)
1756 {
1757         ktime_t kstart = ktime_get();
1758         int err;
1759         ENTRY;
1760
1761         CDEBUG(D_VFSTRACE, "VFS Op:name=%pd, dir="DFID"(%p) mode %o dev %x\n",
1762                dchild, PFID(ll_inode2fid(dir)), dir, mode, rdev);
1763
1764         if (!IS_POSIXACL(dir) || !exp_connect_umask(ll_i2mdexp(dir)))
1765                 mode &= ~current_umask();
1766
1767         switch (mode & S_IFMT) {
1768         case 0:
1769                 mode |= S_IFREG;
1770                 fallthrough;
1771         case S_IFREG:
1772         case S_IFCHR:
1773         case S_IFBLK:
1774         case S_IFIFO:
1775         case S_IFSOCK:
1776                 err = ll_new_node(dir, dchild, NULL, mode, old_encode_dev(rdev),
1777                                   LUSTRE_OPC_MKNOD);
1778                 break;
1779         case S_IFDIR:
1780                 err = -EPERM;
1781                 break;
1782         default:
1783                 err = -EINVAL;
1784         }
1785
1786         if (!err)
1787                 ll_stats_ops_tally(ll_i2sbi(dir), LPROC_LL_MKNOD,
1788                                    ktime_us_delta(ktime_get(), kstart));
1789
1790         RETURN(err);
1791 }
1792
1793 /*
1794  * Plain create. Intent create is handled in atomic_open.
1795  */
1796 static int ll_create_nd(struct user_namespace *mnt_userns,
1797                         struct inode *dir, struct dentry *dentry,
1798                         umode_t mode, bool want_excl)
1799 {
1800         ktime_t kstart = ktime_get();
1801         int rc;
1802
1803         CFS_FAIL_TIMEOUT(OBD_FAIL_LLITE_CREATE_FILE_PAUSE, cfs_fail_val);
1804
1805         CDEBUG(D_VFSTRACE,
1806                "VFS Op:name=%pd, dir="DFID"(%p), flags=%u, excl=%d\n",
1807                dentry, PFID(ll_inode2fid(dir)), dir, mode, want_excl);
1808
1809         /* Using mknod(2) to create a regular file is designed to not recognize
1810          * volatile file name, so we use ll_mknod() here. */
1811         rc = ll_mknod(mnt_userns, dir, dentry, mode, 0);
1812
1813         CDEBUG(D_VFSTRACE, "VFS Op:name=%pd, unhashed %d\n",
1814                dentry, d_unhashed(dentry));
1815
1816         if (!rc)
1817                 ll_stats_ops_tally(ll_i2sbi(dir), LPROC_LL_CREATE,
1818                                    ktime_us_delta(ktime_get(), kstart));
1819
1820         return rc;
1821 }
1822
1823 static int ll_symlink(struct user_namespace *mnt_userns, struct inode *dir,
1824                       struct dentry *dchild, const char *oldpath)
1825 {
1826         ktime_t kstart = ktime_get();
1827         int len = strlen(oldpath);
1828         struct llcrypt_str disk_link;
1829         int err;
1830         ENTRY;
1831
1832         CDEBUG(D_VFSTRACE, "VFS Op:name=%pd, dir="DFID"(%p), target=%.*s\n",
1833                dchild, PFID(ll_inode2fid(dir)), dir, 3000, oldpath);
1834
1835         err = llcrypt_prepare_symlink(dir, oldpath, len, dir->i_sb->s_blocksize,
1836                                       &disk_link);
1837         if (err)
1838                 RETURN(err);
1839
1840         err = ll_new_node(dir, dchild, oldpath, S_IFLNK | S_IRWXUGO,
1841                           (__u64)&disk_link, LUSTRE_OPC_SYMLINK);
1842
1843         if (disk_link.name != (unsigned char *)oldpath)
1844                 kfree(disk_link.name);
1845
1846         if (!err)
1847                 ll_stats_ops_tally(ll_i2sbi(dir), LPROC_LL_SYMLINK,
1848                                    ktime_us_delta(ktime_get(), kstart));
1849
1850         RETURN(err);
1851 }
1852
1853 static int ll_link(struct dentry *old_dentry, struct inode *dir,
1854                    struct dentry *new_dentry)
1855 {
1856         struct inode *src = old_dentry->d_inode;
1857         struct qstr *name = &new_dentry->d_name;
1858         struct ll_sb_info *sbi = ll_i2sbi(dir);
1859         struct ptlrpc_request *request = NULL;
1860         struct md_op_data *op_data;
1861         ktime_t kstart = ktime_get();
1862         int err;
1863
1864         ENTRY;
1865         CDEBUG(D_VFSTRACE,
1866                "VFS Op: inode="DFID"(%p), dir="DFID"(%p), target=%pd\n",
1867                PFID(ll_inode2fid(src)), src,
1868                PFID(ll_inode2fid(dir)), dir, new_dentry);
1869
1870         err = llcrypt_prepare_link(old_dentry, dir, new_dentry);
1871         if (err)
1872                 RETURN(err);
1873
1874         op_data = ll_prep_md_op_data(NULL, src, dir, name->name, name->len,
1875                                      0, LUSTRE_OPC_ANY, NULL);
1876         if (IS_ERR(op_data))
1877                 RETURN(PTR_ERR(op_data));
1878
1879         err = md_link(sbi->ll_md_exp, op_data, &request);
1880         ll_finish_md_op_data(op_data);
1881         if (err)
1882                 GOTO(out, err);
1883
1884         ll_update_times(request, dir);
1885         ll_stats_ops_tally(sbi, LPROC_LL_LINK,
1886                            ktime_us_delta(ktime_get(), kstart));
1887         EXIT;
1888 out:
1889         ptlrpc_req_finished(request);
1890         RETURN(err);
1891 }
1892
1893 static int ll_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
1894                     struct dentry *dchild, umode_t mode)
1895 {
1896         ktime_t kstart = ktime_get();
1897         int err;
1898         ENTRY;
1899
1900         CDEBUG(D_VFSTRACE, "VFS Op:name=%pd, dir="DFID"(%p)\n",
1901                dchild, PFID(ll_inode2fid(dir)), dir);
1902
1903         if (!IS_POSIXACL(dir) || !exp_connect_umask(ll_i2mdexp(dir)))
1904                 mode &= ~current_umask();
1905
1906         mode = (mode & (S_IRWXUGO|S_ISVTX)) | S_IFDIR;
1907
1908         err = ll_new_node(dir, dchild, NULL, mode, 0, LUSTRE_OPC_MKDIR);
1909         if (err == 0)
1910                 ll_stats_ops_tally(ll_i2sbi(dir), LPROC_LL_MKDIR,
1911                                    ktime_us_delta(ktime_get(), kstart));
1912
1913         RETURN(err);
1914 }
1915
1916 static int ll_rmdir(struct inode *dir, struct dentry *dchild)
1917 {
1918         struct qstr *name = &dchild->d_name;
1919         struct ptlrpc_request *request = NULL;
1920         struct md_op_data *op_data;
1921         ktime_t kstart = ktime_get();
1922         int rc;
1923
1924         ENTRY;
1925
1926         CDEBUG(D_VFSTRACE, "VFS Op:name=%pd, dir="DFID"(%p)\n",
1927                dchild, PFID(ll_inode2fid(dir)), dir);
1928
1929         if (unlikely(d_mountpoint(dchild)))
1930                 RETURN(-EBUSY);
1931
1932         /* some foreign dir may not be allowed to be removed */
1933         if (!ll_foreign_is_removable(dchild, false))
1934                 RETURN(-EPERM);
1935
1936         op_data = ll_prep_md_op_data(NULL, dir, NULL, name->name, name->len,
1937                                      S_IFDIR, LUSTRE_OPC_ANY, NULL);
1938         if (IS_ERR(op_data))
1939                 RETURN(PTR_ERR(op_data));
1940
1941         if (dchild->d_inode != NULL)
1942                 op_data->op_fid3 = *ll_inode2fid(dchild->d_inode);
1943
1944         if (fid_is_zero(&op_data->op_fid2))
1945                 op_data->op_fid2 = op_data->op_fid3;
1946         rc = md_unlink(ll_i2sbi(dir)->ll_md_exp, op_data, &request);
1947         ll_finish_md_op_data(op_data);
1948         if (!rc) {
1949                 struct mdt_body *body;
1950
1951                 ll_update_times(request, dir);
1952                 ll_stats_ops_tally(ll_i2sbi(dir), LPROC_LL_RMDIR,
1953                                    ktime_us_delta(ktime_get(), kstart));
1954
1955                 /*
1956                  * The server puts attributes in on the last unlink, use them
1957                  * to update the link count so the inode can be freed
1958                  * immediately.
1959                  */
1960                 body = req_capsule_server_get(&request->rq_pill, &RMF_MDT_BODY);
1961                 if (body->mbo_valid & OBD_MD_FLNLINK) {
1962                         spin_lock(&dchild->d_inode->i_lock);
1963                         set_nlink(dchild->d_inode, body->mbo_nlink);
1964                         spin_unlock(&dchild->d_inode->i_lock);
1965                 }
1966         }
1967
1968         ptlrpc_req_finished(request);
1969
1970         RETURN(rc);
1971 }
1972
1973 /**
1974  * Remove dir entry
1975  **/
1976 int ll_rmdir_entry(struct inode *dir, char *name, int namelen)
1977 {
1978         struct ptlrpc_request *request = NULL;
1979         struct md_op_data *op_data;
1980         ktime_t kstart = ktime_get();
1981         int rc;
1982         ENTRY;
1983
1984         CDEBUG(D_VFSTRACE, "VFS Op:name=%.*s, dir="DFID"(%p)\n",
1985                namelen, name, PFID(ll_inode2fid(dir)), dir);
1986
1987         op_data = ll_prep_md_op_data(NULL, dir, NULL, name, strlen(name),
1988                                      S_IFDIR, LUSTRE_OPC_ANY, NULL);
1989         if (IS_ERR(op_data))
1990                 RETURN(PTR_ERR(op_data));
1991         op_data->op_cli_flags |= CLI_RM_ENTRY;
1992         rc = md_unlink(ll_i2sbi(dir)->ll_md_exp, op_data, &request);
1993         ll_finish_md_op_data(op_data);
1994         if (!rc)
1995                 ll_update_times(request, dir);
1996
1997         ptlrpc_req_finished(request);
1998         if (!rc)
1999                 ll_stats_ops_tally(ll_i2sbi(dir), LPROC_LL_RMDIR,
2000                                    ktime_us_delta(ktime_get(), kstart));
2001         RETURN(rc);
2002 }
2003
2004 static int ll_unlink(struct inode *dir, struct dentry *dchild)
2005 {
2006         struct qstr *name = &dchild->d_name;
2007         struct ptlrpc_request *request = NULL;
2008         struct md_op_data *op_data;
2009         struct mdt_body *body;
2010         ktime_t kstart = ktime_get();
2011         int rc;
2012
2013         ENTRY;
2014
2015         CDEBUG(D_VFSTRACE, "VFS Op:name=%pd, dir="DFID"(%p)\n",
2016                dchild, PFID(ll_inode2fid(dir)), dir);
2017
2018         /*
2019          * XXX: unlink bind mountpoint maybe call to here,
2020          * just check it as vfs_unlink does.
2021          */
2022         if (unlikely(d_mountpoint(dchild)))
2023                 RETURN(-EBUSY);
2024
2025         /* some foreign file/dir may not be allowed to be unlinked */
2026         if (!ll_foreign_is_removable(dchild, false))
2027                 RETURN(-EPERM);
2028
2029         op_data = ll_prep_md_op_data(NULL, dir, NULL, name->name, name->len, 0,
2030                                      LUSTRE_OPC_ANY, NULL);
2031         if (IS_ERR(op_data))
2032                 RETURN(PTR_ERR(op_data));
2033
2034         op_data->op_fid3 = *ll_inode2fid(dchild->d_inode);
2035         /* notify lower layer if inode has dirty pages */
2036         if (S_ISREG(dchild->d_inode->i_mode) &&
2037             ll_i2info(dchild->d_inode)->lli_clob &&
2038             dirty_cnt(dchild->d_inode))
2039                 op_data->op_cli_flags |= CLI_DIRTY_DATA;
2040         if (fid_is_zero(&op_data->op_fid2))
2041                 op_data->op_fid2 = op_data->op_fid3;
2042         rc = md_unlink(ll_i2sbi(dir)->ll_md_exp, op_data, &request);
2043         ll_finish_md_op_data(op_data);
2044         if (rc)
2045                 GOTO(out, rc);
2046
2047         /*
2048          * The server puts attributes in on the last unlink, use them to update
2049          * the link count so the inode can be freed immediately.
2050          */
2051         body = req_capsule_server_get(&request->rq_pill, &RMF_MDT_BODY);
2052         if (body->mbo_valid & OBD_MD_FLNLINK) {
2053                 spin_lock(&dchild->d_inode->i_lock);
2054                 set_nlink(dchild->d_inode, body->mbo_nlink);
2055                 spin_unlock(&dchild->d_inode->i_lock);
2056         }
2057
2058         ll_update_times(request, dir);
2059
2060 out:
2061         ptlrpc_req_finished(request);
2062         if (!rc)
2063                 ll_stats_ops_tally(ll_i2sbi(dir), LPROC_LL_UNLINK,
2064                                    ktime_us_delta(ktime_get(), kstart));
2065         RETURN(rc);
2066 }
2067
2068 static int ll_rename(struct user_namespace *mnt_userns,
2069                      struct inode *src, struct dentry *src_dchild,
2070                      struct inode *tgt, struct dentry *tgt_dchild
2071 #if defined(HAVE_USER_NAMESPACE_ARG) || defined(HAVE_IOPS_RENAME_WITH_FLAGS)
2072                      , unsigned int flags
2073 #endif
2074                      )
2075 {
2076         struct ptlrpc_request *request = NULL;
2077         struct ll_sb_info *sbi = ll_i2sbi(src);
2078         struct md_op_data *op_data;
2079         ktime_t kstart = ktime_get();
2080         umode_t mode = 0;
2081         struct llcrypt_name foldname, fnewname;
2082         int err;
2083         ENTRY;
2084
2085 #if defined(HAVE_USER_NAMESPACE_ARG) || defined(HAVE_IOPS_RENAME_WITH_FLAGS)
2086         if (flags)
2087                 return -EINVAL;
2088 #endif
2089
2090         CDEBUG(D_VFSTRACE,
2091                "VFS Op:oldname=%pd, src_dir="DFID"(%p), newname=%pd, tgt_dir="DFID"(%p)\n",
2092                src_dchild, PFID(ll_inode2fid(src)), src,
2093                tgt_dchild, PFID(ll_inode2fid(tgt)), tgt);
2094
2095         if (unlikely(d_mountpoint(src_dchild) || d_mountpoint(tgt_dchild)))
2096                 RETURN(-EBUSY);
2097
2098 #if defined(HAVE_USER_NAMESPACE_ARG) || defined(HAVE_IOPS_RENAME_WITH_FLAGS)
2099         err = llcrypt_prepare_rename(src, src_dchild, tgt, tgt_dchild, flags);
2100 #else
2101         err = llcrypt_prepare_rename(src, src_dchild, tgt, tgt_dchild, 0);
2102 #endif
2103         if (err)
2104                 RETURN(err);
2105         /* we prevent an encrypted file from being renamed
2106          * into an unencrypted dir
2107          */
2108         if (IS_ENCRYPTED(src) && !IS_ENCRYPTED(tgt))
2109                 RETURN(-EXDEV);
2110
2111         if (src_dchild->d_inode)
2112                 mode = src_dchild->d_inode->i_mode;
2113
2114         if (tgt_dchild->d_inode)
2115                 mode = tgt_dchild->d_inode->i_mode;
2116
2117         op_data = ll_prep_md_op_data(NULL, src, tgt, NULL, 0, mode,
2118                                      LUSTRE_OPC_ANY, NULL);
2119         if (IS_ERR(op_data))
2120                 RETURN(PTR_ERR(op_data));
2121
2122         /* If the client is using a subdir mount and does a rename to what it
2123          * sees as /.fscrypt, interpret it as the .fscrypt dir at fs root.
2124          */
2125         if (unlikely(is_root_inode(tgt) && !fid_is_root(ll_inode2fid(tgt)) &&
2126                      tgt_dchild->d_name.len == strlen(dot_fscrypt_name) &&
2127                      strncmp(tgt_dchild->d_name.name, dot_fscrypt_name,
2128                              tgt_dchild->d_name.len) == 0))
2129                 lu_root_fid(&op_data->op_fid2);
2130
2131         if (src_dchild->d_inode)
2132                 op_data->op_fid3 = *ll_inode2fid(src_dchild->d_inode);
2133
2134         if (tgt_dchild->d_inode)
2135                 op_data->op_fid4 = *ll_inode2fid(tgt_dchild->d_inode);
2136
2137         err = ll_setup_filename(src, &src_dchild->d_name, 1, &foldname, NULL);
2138         if (err)
2139                 RETURN(err);
2140         err = ll_setup_filename(tgt, &tgt_dchild->d_name, 1, &fnewname, NULL);
2141         if (err) {
2142                 llcrypt_free_filename(&foldname);
2143                 RETURN(err);
2144         }
2145         err = md_rename(sbi->ll_md_exp, op_data,
2146                         foldname.disk_name.name, foldname.disk_name.len,
2147                         fnewname.disk_name.name, fnewname.disk_name.len,
2148                         &request);
2149         llcrypt_free_filename(&foldname);
2150         llcrypt_free_filename(&fnewname);
2151         ll_finish_md_op_data(op_data);
2152         if (!err) {
2153                 ll_update_times(request, src);
2154                 ll_update_times(request, tgt);
2155         }
2156
2157         ptlrpc_req_finished(request);
2158
2159         if (!err) {
2160                 d_move(src_dchild, tgt_dchild);
2161                 ll_stats_ops_tally(sbi, LPROC_LL_RENAME,
2162                                    ktime_us_delta(ktime_get(), kstart));
2163         }
2164
2165         RETURN(err);
2166 }
2167
2168 const struct inode_operations ll_dir_inode_operations = {
2169         .mknod          = ll_mknod,
2170         .atomic_open    = ll_atomic_open,
2171         .lookup         = ll_lookup_nd,
2172         .create         = ll_create_nd,
2173         /* We need all these non-raw things for NFSD, to not patch it. */
2174         .unlink         = ll_unlink,
2175         .mkdir          = ll_mkdir,
2176         .rmdir          = ll_rmdir,
2177         .symlink        = ll_symlink,
2178         .link           = ll_link,
2179         .rename         = ll_rename,
2180         .setattr        = ll_setattr,
2181         .getattr        = ll_getattr,
2182         .permission     = ll_inode_permission,
2183 #ifdef HAVE_IOP_XATTR
2184         .setxattr       = ll_setxattr,
2185         .getxattr       = ll_getxattr,
2186         .removexattr    = ll_removexattr,
2187 #endif
2188         .listxattr      = ll_listxattr,
2189         .get_acl        = ll_get_acl,
2190 #ifdef HAVE_IOP_SET_ACL
2191         .set_acl        = ll_set_acl,
2192 #endif
2193 };
2194
2195 const struct inode_operations ll_special_inode_operations = {
2196         .setattr        = ll_setattr,
2197         .getattr        = ll_getattr,
2198         .permission     = ll_inode_permission,
2199 #ifdef HAVE_IOP_XATTR
2200         .setxattr       = ll_setxattr,
2201         .getxattr       = ll_getxattr,
2202         .removexattr    = ll_removexattr,
2203 #endif
2204         .listxattr      = ll_listxattr,
2205         .get_acl        = ll_get_acl,
2206 #ifdef HAVE_IOP_SET_ACL
2207         .set_acl        = ll_set_acl,
2208 #endif
2209 };