From owner-dev-commits-src-all@freebsd.org Wed May 19 17:59:28 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 DBFEB647DB3; Wed, 19 May 2021 17:59:28 +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 "R3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4FlgcJ53kFz4qc3; Wed, 19 May 2021 17:59:28 +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 926C416FBB; Wed, 19 May 2021 17:59:28 +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 14JHxSP1021659; Wed, 19 May 2021 17:59:28 GMT (envelope-from git@gitrepo.freebsd.org) Received: (from git@localhost) by gitrepo.freebsd.org (8.16.1/8.16.1/Submit) id 14JHxSOv021658; Wed, 19 May 2021 17:59:28 GMT (envelope-from git) Date: Wed, 19 May 2021 17:59:28 GMT Message-Id: <202105191759.14JHxSOv021658@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: 4fe925b81e75 - main - fdescfs: allow shared locking of root vnode 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: 4fe925b81e75b5885ec6d504c6217f848439164a 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, 19 May 2021 17:59:29 -0000 The branch main has been updated by mjg: URL: https://cgit.FreeBSD.org/src/commit/?id=4fe925b81e75b5885ec6d504c6217f848439164a commit 4fe925b81e75b5885ec6d504c6217f848439164a Author: Mateusz Guzik AuthorDate: 2021-05-19 15:59:20 +0000 Commit: Mateusz Guzik CommitDate: 2021-05-19 17:58:54 +0000 fdescfs: allow shared locking of root vnode Eliminates fdescfs from lock profile when running poudriere. --- sys/fs/fdescfs/fdesc_vfsops.c | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-) diff --git a/sys/fs/fdescfs/fdesc_vfsops.c b/sys/fs/fdescfs/fdesc_vfsops.c index e7878f115ac2..64f8d28bdcfd 100644 --- a/sys/fs/fdescfs/fdesc_vfsops.c +++ b/sys/fs/fdescfs/fdesc_vfsops.c @@ -107,12 +107,23 @@ fdesc_mount(struct mount *mp) mp->mnt_data = NULL; return (error); } + VN_LOCK_ASHARE(rvp); rvp->v_type = VDIR; rvp->v_vflag |= VV_ROOT; fmp->f_root = rvp; VOP_UNLOCK(rvp); + + MNT_ILOCK(mp); /* XXX -- don't mark as local to work around fts() problems */ /*mp->mnt_flag |= MNT_LOCAL;*/ + /* + * Enable shared locking so that there is no contention on the root + * vnode. Note only root vnode enables shared locking for itself, + * so this end up being a nop for the rest. + */ + mp->mnt_kern_flag |= MNTK_LOOKUP_SHARED | MNTK_EXTENDED_SHARED; + MNT_IUNLOCK(mp); + vfs_getnewfsid(mp); vfs_mountedfrom(mp, "fdescfs"); @@ -163,7 +174,7 @@ fdesc_root(struct mount *mp, int flags, struct vnode **vpp) * Return locked reference to root. */ vp = VFSTOFDESC(mp)->f_root; - vget(vp, LK_EXCLUSIVE | LK_RETRY); + vget(vp, flags | LK_RETRY); *vpp = vp; return (0); }