From owner-dev-commits-src-all@freebsd.org Wed Jan 13 03:31:42 2021 Return-Path: Delivered-To: dev-commits-src-all@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id 9665D4EEE67; Wed, 13 Jan 2021 03:31:42 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.nyi.freebsd.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4DFtKB2JnXz3MhV; Wed, 13 Jan 2021 03:31:42 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from gitrepo.freebsd.org (gitrepo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:5]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id 5380810DF8; Wed, 13 Jan 2021 03:31:41 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from gitrepo.freebsd.org ([127.0.1.44]) by gitrepo.freebsd.org (8.16.1/8.16.1) with ESMTP id 10D3VfGZ029076; Wed, 13 Jan 2021 03:31:41 GMT (envelope-from git@gitrepo.freebsd.org) Received: (from git@localhost) by gitrepo.freebsd.org (8.16.1/8.16.1/Submit) id 10D3Vfvq029075; Wed, 13 Jan 2021 03:31:41 GMT (envelope-from git) Date: Wed, 13 Jan 2021 03:31:41 GMT Message-Id: <202101130331.10D3Vfvq029075@gitrepo.freebsd.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org From: Mateusz Guzik Subject: git: 5171310e661d - main - vfs: use finstall_refed in openat MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Git-Committer: mjg X-Git-Repository: src X-Git-Refname: refs/heads/main X-Git-Reftype: branch X-Git-Commit: 5171310e661d6c85f6208d86c6f651e3d499e346 Auto-Submitted: auto-generated X-BeenThere: dev-commits-src-all@freebsd.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Commit messages for all branches of the src repository List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 13 Jan 2021 03:31:42 -0000 The branch main has been updated by mjg: URL: https://cgit.FreeBSD.org/src/commit/?id=5171310e661d6c85f6208d86c6f651e3d499e346 commit 5171310e661d6c85f6208d86c6f651e3d499e346 Author: Mateusz Guzik AuthorDate: 2021-01-12 16:11:15 +0000 Commit: Mateusz Guzik CommitDate: 2021-01-13 03:30:38 +0000 vfs: use finstall_refed in openat This avoids 2 atomic ops in the common case: 1 to grab an extra reference and 1 to release it. --- sys/kern/vfs_syscalls.c | 16 ++++------------ 1 file changed, 4 insertions(+), 12 deletions(-) diff --git a/sys/kern/vfs_syscalls.c b/sys/kern/vfs_syscalls.c index 560a003765d5..c1b6c70ab0ac 100644 --- a/sys/kern/vfs_syscalls.c +++ b/sys/kern/vfs_syscalls.c @@ -1129,15 +1129,11 @@ kern_openat(struct thread *td, int fd, const char *path, enum uio_seg pathseg, /* * Allocate a file structure. The descriptor to reference it - * is allocated and set by finstall() below. + * is allocated and used by finstall_refed() below. */ error = falloc_noinstall(td, &fp); if (error != 0) return (error); - /* - * An extra reference on `fp' has been held for us by - * falloc_noinstall(). - */ /* Set the flags early so the finit in devfs can pick them up. */ fp->f_flag = flags & FMASK; cmode = ((mode & ~pdp->pd_cmask) & ALLPERMS) & ~S_ISTXT; @@ -1210,21 +1206,17 @@ success: else #endif fcaps = NULL; - error = finstall(td, fp, &indx, flags, fcaps); - /* On success finstall() consumes fcaps. */ + error = finstall_refed(td, fp, &indx, flags, fcaps); + /* On success finstall_refed() consumes fcaps. */ if (error != 0) { filecaps_free(&nd.ni_filecaps); goto bad; } } else { filecaps_free(&nd.ni_filecaps); + fdrop_close(fp, td); } - /* - * Release our private reference, leaving the one associated with - * the descriptor table intact. - */ - fdrop(fp, td); td->td_retval[0] = indx; return (0); bad: