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Fri, 12 Sep 2025 01:21:47 -0700 (PDT) Received: from localhost ([196.207.164.177]) by smtp.gmail.com with UTF8SMTPSA id 5b1f17b1804b1-45e016b5cbcsm56441345e9.11.2025.09.12.01.21.46 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 12 Sep 2025 01:21:47 -0700 (PDT) Date: Fri, 12 Sep 2025 11:21:44 +0300 From: Dan Carpenter To: oe-kbuild@lists.linux.dev, Thomas Bertschinger , io-uring@vger.kernel.org, axboe@kernel.dk, linux-fsdevel@vger.kernel.org, viro@zeniv.linux.org.uk, brauner@kernel.org, linux-nfs@vger.kernel.org Cc: lkp@intel.com, oe-kbuild-all@lists.linux.dev, Thomas Bertschinger , Amir Goldstein , chuck.lever@oracle.com, jlayton@kernel.org Subject: Re: [PATCH 07/10] exportfs: new FILEID_CACHED flag for non-blocking fh lookup Message-ID: <202509120423.cZlR8oLY-lkp@intel.com> Precedence: bulk X-Mailing-List: io-uring@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20250910214927.480316-8-tahbertschinger@gmail.com> Hi Thomas, kernel test robot noticed the following build warnings: url: https://github.com/intel-lab-lkp/linux/commits/Thomas-Bertschinger/fhandle-create-helper-for-name_to_handle_at-2/20250911-054830 base: 76eeb9b8de9880ca38696b2fb56ac45ac0a25c6c patch link: https://lore.kernel.org/r/20250910214927.480316-8-tahbertschinger%40gmail.com patch subject: [PATCH 07/10] exportfs: new FILEID_CACHED flag for non-blocking fh lookup config: arm-randconfig-r071-20250911 (https://download.01.org/0day-ci/archive/20250912/202509120423.cZlR8oLY-lkp@intel.com/config) compiler: clang version 22.0.0git (https://github.com/llvm/llvm-project 21857ae337e0892a5522b6e7337899caa61de2a6) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot | Reported-by: Dan Carpenter | Closes: https://lore.kernel.org/r/202509120423.cZlR8oLY-lkp@intel.com/ smatch warnings: fs/exportfs/expfs.c:539 exportfs_decode_fh_raw() warn: maybe use && instead of & vim +539 fs/exportfs/expfs.c d045465fc6cbfa4 Trond Myklebust 2020-11-30 437 struct dentry * d045465fc6cbfa4 Trond Myklebust 2020-11-30 438 exportfs_decode_fh_raw(struct vfsmount *mnt, struct fid *fid, int fh_len, 620c266f394932e Christian Brauner 2024-05-24 439 int fileid_type, unsigned int flags, d045465fc6cbfa4 Trond Myklebust 2020-11-30 440 int (*acceptable)(void *, struct dentry *), d045465fc6cbfa4 Trond Myklebust 2020-11-30 441 void *context) d37065cd6d6bbe9 Christoph Hellwig 2007-07-17 442 { 39655164405940d Christoph Hellwig 2007-10-21 443 const struct export_operations *nop = mnt->mnt_sb->s_export_op; 638205375afdc8a Thomas Bertschinger 2025-09-10 444 bool decode_cached = fileid_type & FILEID_CACHED; 2596110a3994593 Christoph Hellwig 2007-10-21 445 struct dentry *result, *alias; f3f8e17571934ea Al Viro 2008-08-11 446 char nbuf[NAME_MAX+1]; 2596110a3994593 Christoph Hellwig 2007-10-21 447 int err; d37065cd6d6bbe9 Christoph Hellwig 2007-07-17 448 4a530a7c751d27f Amir Goldstein 2024-10-11 449 if (fileid_type < 0 || FILEID_USER_FLAGS(fileid_type)) 4a530a7c751d27f Amir Goldstein 2024-10-11 450 return ERR_PTR(-EINVAL); 4a530a7c751d27f Amir Goldstein 2024-10-11 451 2596110a3994593 Christoph Hellwig 2007-10-21 452 /* 2596110a3994593 Christoph Hellwig 2007-10-21 453 * Try to get any dentry for the given file handle from the filesystem. 2596110a3994593 Christoph Hellwig 2007-10-21 454 */ 66c62769bcf6aa1 Amir Goldstein 2023-10-23 455 if (!exportfs_can_decode_fh(nop)) becfd1f37544798 Aneesh Kumar K.V 2011-01-29 456 return ERR_PTR(-ESTALE); 638205375afdc8a Thomas Bertschinger 2025-09-10 457 638205375afdc8a Thomas Bertschinger 2025-09-10 458 if (decode_cached && !(nop->flags & EXPORT_OP_NONBLOCK)) 638205375afdc8a Thomas Bertschinger 2025-09-10 459 return ERR_PTR(-EAGAIN); 638205375afdc8a Thomas Bertschinger 2025-09-10 460 2596110a3994593 Christoph Hellwig 2007-10-21 461 result = nop->fh_to_dentry(mnt->mnt_sb, fid, fh_len, fileid_type); 09bb8bfffd29c3d NeilBrown 2016-08-04 462 if (IS_ERR_OR_NULL(result)) d045465fc6cbfa4 Trond Myklebust 2020-11-30 463 return result; 2596110a3994593 Christoph Hellwig 2007-10-21 464 620c266f394932e Christian Brauner 2024-05-24 465 if ((flags & EXPORT_FH_DIR_ONLY) && !d_is_dir(result)) { 620c266f394932e Christian Brauner 2024-05-24 466 err = -ENOTDIR; 620c266f394932e Christian Brauner 2024-05-24 467 goto err_result; 620c266f394932e Christian Brauner 2024-05-24 468 } 620c266f394932e Christian Brauner 2024-05-24 469 8a22efa15b46d52 Amir Goldstein 2018-03-09 470 /* 8a22efa15b46d52 Amir Goldstein 2018-03-09 471 * If no acceptance criteria was specified by caller, a disconnected 8a22efa15b46d52 Amir Goldstein 2018-03-09 472 * dentry is also accepatable. Callers may use this mode to query if 8a22efa15b46d52 Amir Goldstein 2018-03-09 473 * file handle is stale or to get a reference to an inode without 8a22efa15b46d52 Amir Goldstein 2018-03-09 474 * risking the high overhead caused by directory reconnect. 8a22efa15b46d52 Amir Goldstein 2018-03-09 475 */ 8a22efa15b46d52 Amir Goldstein 2018-03-09 476 if (!acceptable) 8a22efa15b46d52 Amir Goldstein 2018-03-09 477 return result; 8a22efa15b46d52 Amir Goldstein 2018-03-09 478 e36cb0b89ce20b4 David Howells 2015-01-29 479 if (d_is_dir(result)) { 2596110a3994593 Christoph Hellwig 2007-10-21 480 /* 2596110a3994593 Christoph Hellwig 2007-10-21 481 * This request is for a directory. 2596110a3994593 Christoph Hellwig 2007-10-21 482 * 2596110a3994593 Christoph Hellwig 2007-10-21 483 * On the positive side there is only one dentry for each 2596110a3994593 Christoph Hellwig 2007-10-21 484 * directory inode. On the negative side this implies that we 2596110a3994593 Christoph Hellwig 2007-10-21 485 * to ensure our dentry is connected all the way up to the 2596110a3994593 Christoph Hellwig 2007-10-21 486 * filesystem root. 2596110a3994593 Christoph Hellwig 2007-10-21 487 */ 2596110a3994593 Christoph Hellwig 2007-10-21 488 if (result->d_flags & DCACHE_DISCONNECTED) { 638205375afdc8a Thomas Bertschinger 2025-09-10 489 err = -EAGAIN; 638205375afdc8a Thomas Bertschinger 2025-09-10 490 if (decode_cached) 638205375afdc8a Thomas Bertschinger 2025-09-10 491 goto err_result; 638205375afdc8a Thomas Bertschinger 2025-09-10 492 f3f8e17571934ea Al Viro 2008-08-11 493 err = reconnect_path(mnt, result, nbuf); 2596110a3994593 Christoph Hellwig 2007-10-21 494 if (err) 2596110a3994593 Christoph Hellwig 2007-10-21 495 goto err_result; 2596110a3994593 Christoph Hellwig 2007-10-21 496 } 2596110a3994593 Christoph Hellwig 2007-10-21 497 2596110a3994593 Christoph Hellwig 2007-10-21 498 if (!acceptable(context, result)) { 2596110a3994593 Christoph Hellwig 2007-10-21 499 err = -EACCES; 2596110a3994593 Christoph Hellwig 2007-10-21 500 goto err_result; 2596110a3994593 Christoph Hellwig 2007-10-21 501 } 2596110a3994593 Christoph Hellwig 2007-10-21 502 2596110a3994593 Christoph Hellwig 2007-10-21 503 return result; 2596110a3994593 Christoph Hellwig 2007-10-21 504 } else { 2596110a3994593 Christoph Hellwig 2007-10-21 505 /* 2596110a3994593 Christoph Hellwig 2007-10-21 506 * It's not a directory. Life is a little more complicated. 2596110a3994593 Christoph Hellwig 2007-10-21 507 */ 2596110a3994593 Christoph Hellwig 2007-10-21 508 struct dentry *target_dir, *nresult; 2596110a3994593 Christoph Hellwig 2007-10-21 509 2596110a3994593 Christoph Hellwig 2007-10-21 510 /* 2596110a3994593 Christoph Hellwig 2007-10-21 511 * See if either the dentry we just got from the filesystem 2596110a3994593 Christoph Hellwig 2007-10-21 512 * or any alias for it is acceptable. This is always true 2596110a3994593 Christoph Hellwig 2007-10-21 513 * if this filesystem is exported without the subtreecheck 2596110a3994593 Christoph Hellwig 2007-10-21 514 * option. If the filesystem is exported with the subtree 2596110a3994593 Christoph Hellwig 2007-10-21 515 * check option there's a fair chance we need to look at 2596110a3994593 Christoph Hellwig 2007-10-21 516 * the parent directory in the file handle and make sure 2596110a3994593 Christoph Hellwig 2007-10-21 517 * it's connected to the filesystem root. 2596110a3994593 Christoph Hellwig 2007-10-21 518 */ 2596110a3994593 Christoph Hellwig 2007-10-21 519 alias = find_acceptable_alias(result, acceptable, context); 2596110a3994593 Christoph Hellwig 2007-10-21 520 if (alias) 2596110a3994593 Christoph Hellwig 2007-10-21 521 return alias; 2596110a3994593 Christoph Hellwig 2007-10-21 522 2596110a3994593 Christoph Hellwig 2007-10-21 523 /* 2596110a3994593 Christoph Hellwig 2007-10-21 524 * Try to extract a dentry for the parent directory from the 2596110a3994593 Christoph Hellwig 2007-10-21 525 * file handle. If this fails we'll have to give up. 2596110a3994593 Christoph Hellwig 2007-10-21 526 */ 2596110a3994593 Christoph Hellwig 2007-10-21 527 err = -ESTALE; 2596110a3994593 Christoph Hellwig 2007-10-21 528 if (!nop->fh_to_parent) 2596110a3994593 Christoph Hellwig 2007-10-21 529 goto err_result; 2596110a3994593 Christoph Hellwig 2007-10-21 530 2596110a3994593 Christoph Hellwig 2007-10-21 531 target_dir = nop->fh_to_parent(mnt->mnt_sb, fid, 2596110a3994593 Christoph Hellwig 2007-10-21 532 fh_len, fileid_type); a4f4d6df5373682 J. Bruce Fields 2008-12-08 533 if (!target_dir) a4f4d6df5373682 J. Bruce Fields 2008-12-08 534 goto err_result; 2596110a3994593 Christoph Hellwig 2007-10-21 535 err = PTR_ERR(target_dir); 2596110a3994593 Christoph Hellwig 2007-10-21 536 if (IS_ERR(target_dir)) 2596110a3994593 Christoph Hellwig 2007-10-21 537 goto err_result; 638205375afdc8a Thomas Bertschinger 2025-09-10 538 err = -EAGAIN; 638205375afdc8a Thomas Bertschinger 2025-09-10 @539 if (decode_cached & (target_dir->d_flags & DCACHE_DISCONNECTED)) { It needs to be &&. DCACHE_DISCONNECTED is BIT(5). 638205375afdc8a Thomas Bertschinger 2025-09-10 540 goto err_result; 638205375afdc8a Thomas Bertschinger 2025-09-10 541 } 2596110a3994593 Christoph Hellwig 2007-10-21 542 2596110a3994593 Christoph Hellwig 2007-10-21 543 /* 2596110a3994593 Christoph Hellwig 2007-10-21 544 * And as usual we need to make sure the parent directory is 2596110a3994593 Christoph Hellwig 2007-10-21 545 * connected to the filesystem root. The VFS really doesn't 2596110a3994593 Christoph Hellwig 2007-10-21 546 * like disconnected directories.. 2596110a3994593 Christoph Hellwig 2007-10-21 547 */ f3f8e17571934ea Al Viro 2008-08-11 548 err = reconnect_path(mnt, target_dir, nbuf); 2596110a3994593 Christoph Hellwig 2007-10-21 549 if (err) { 2596110a3994593 Christoph Hellwig 2007-10-21 550 dput(target_dir); 2596110a3994593 Christoph Hellwig 2007-10-21 551 goto err_result; 2596110a3994593 Christoph Hellwig 2007-10-21 552 } 2596110a3994593 Christoph Hellwig 2007-10-21 553 2596110a3994593 Christoph Hellwig 2007-10-21 554 /* 2596110a3994593 Christoph Hellwig 2007-10-21 555 * Now that we've got both a well-connected parent and a 2596110a3994593 Christoph Hellwig 2007-10-21 556 * dentry for the inode we're after, make sure that our 2596110a3994593 Christoph Hellwig 2007-10-21 557 * inode is actually connected to the parent. 2596110a3994593 Christoph Hellwig 2007-10-21 558 */ e38f981758118d8 Christoph Hellwig 2007-10-21 559 err = exportfs_get_name(mnt, target_dir, nbuf, result); a2ece088882666e Al Viro 2019-11-08 560 if (err) { a2ece088882666e Al Viro 2019-11-08 561 dput(target_dir); a2ece088882666e Al Viro 2019-11-08 562 goto err_result; a2ece088882666e Al Viro 2019-11-08 563 } a2ece088882666e Al Viro 2019-11-08 564 ce3490038971a20 NeilBrown 2025-06-09 565 nresult = lookup_one_unlocked(mnt_idmap(mnt), &QSTR(nbuf), target_dir); 2596110a3994593 Christoph Hellwig 2007-10-21 566 if (!IS_ERR(nresult)) { a2ece088882666e Al Viro 2019-11-08 567 if (unlikely(nresult->d_inode != result->d_inode)) { 2596110a3994593 Christoph Hellwig 2007-10-21 568 dput(nresult); a2ece088882666e Al Viro 2019-11-08 569 nresult = ERR_PTR(-ESTALE); 2596110a3994593 Christoph Hellwig 2007-10-21 570 } 2596110a3994593 Christoph Hellwig 2007-10-21 571 } 2596110a3994593 Christoph Hellwig 2007-10-21 572 /* 2596110a3994593 Christoph Hellwig 2007-10-21 573 * At this point we are done with the parent, but it's pinned 2596110a3994593 Christoph Hellwig 2007-10-21 574 * by the child dentry anyway. 2596110a3994593 Christoph Hellwig 2007-10-21 575 */ 2596110a3994593 Christoph Hellwig 2007-10-21 576 dput(target_dir); 2596110a3994593 Christoph Hellwig 2007-10-21 577 a2ece088882666e Al Viro 2019-11-08 578 if (IS_ERR(nresult)) { a2ece088882666e Al Viro 2019-11-08 579 err = PTR_ERR(nresult); a2ece088882666e Al Viro 2019-11-08 580 goto err_result; a2ece088882666e Al Viro 2019-11-08 581 } a2ece088882666e Al Viro 2019-11-08 582 dput(result); a2ece088882666e Al Viro 2019-11-08 583 result = nresult; a2ece088882666e Al Viro 2019-11-08 584 2596110a3994593 Christoph Hellwig 2007-10-21 585 /* 2596110a3994593 Christoph Hellwig 2007-10-21 586 * And finally make sure the dentry is actually acceptable 2596110a3994593 Christoph Hellwig 2007-10-21 587 * to NFSD. 2596110a3994593 Christoph Hellwig 2007-10-21 588 */ 2596110a3994593 Christoph Hellwig 2007-10-21 589 alias = find_acceptable_alias(result, acceptable, context); 2596110a3994593 Christoph Hellwig 2007-10-21 590 if (!alias) { 2596110a3994593 Christoph Hellwig 2007-10-21 591 err = -EACCES; 2596110a3994593 Christoph Hellwig 2007-10-21 592 goto err_result; 2596110a3994593 Christoph Hellwig 2007-10-21 593 } 2596110a3994593 Christoph Hellwig 2007-10-21 594 2596110a3994593 Christoph Hellwig 2007-10-21 595 return alias; 2596110a3994593 Christoph Hellwig 2007-10-21 596 } 2596110a3994593 Christoph Hellwig 2007-10-21 597 2596110a3994593 Christoph Hellwig 2007-10-21 598 err_result: 2596110a3994593 Christoph Hellwig 2007-10-21 599 dput(result); 2596110a3994593 Christoph Hellwig 2007-10-21 600 return ERR_PTR(err); 10f11c341da8c0e Christoph Hellwig 2007-07-17 601 } -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki