From owner-svn-src-head@freebsd.org Fri Nov 20 15:19:30 2020 Return-Path: Delivered-To: svn-src-head@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 D2BDB2ED93B; Fri, 20 Nov 2020 15:19:30 +0000 (UTC) (envelope-from kib@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 4Cd0Zp5Dxrz3m01; Fri, 20 Nov 2020 15:19:30 +0000 (UTC) (envelope-from kib@FreeBSD.org) Received: from repo.freebsd.org (repo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:0]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id 999E51840B; Fri, 20 Nov 2020 15:19:30 +0000 (UTC) (envelope-from kib@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id 0AKFJUVX032983; Fri, 20 Nov 2020 15:19:30 GMT (envelope-from kib@FreeBSD.org) Received: (from kib@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id 0AKFJU42032982; Fri, 20 Nov 2020 15:19:30 GMT (envelope-from kib@FreeBSD.org) Message-Id: <202011201519.0AKFJU42032982@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: kib set sender to kib@FreeBSD.org using -f From: Konstantin Belousov Date: Fri, 20 Nov 2020 15:19:30 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r367895 - head/sys/fs/msdosfs X-SVN-Group: head X-SVN-Commit-Author: kib X-SVN-Commit-Paths: head/sys/fs/msdosfs X-SVN-Commit-Revision: 367895 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-head@freebsd.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: SVN commit messages for the src tree for head/-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 20 Nov 2020 15:19:31 -0000 Author: kib Date: Fri Nov 20 15:19:30 2020 New Revision: 367895 URL: https://svnweb.freebsd.org/changeset/base/367895 Log: msdosfs: suspend around unmount or remount rw->ro. This also eliminates unsafe use of VFS_SYNC(MNT_WAIT). Requested by: mckusick Discussed with: imp Tested by: pho (previous version) Sponsored by: The FreeBSD Foundation MFC after: 2 weeks Differential revision: https://reviews.freebsd.org/D27269 Modified: head/sys/fs/msdosfs/msdosfs_vfsops.c Modified: head/sys/fs/msdosfs/msdosfs_vfsops.c ============================================================================== --- head/sys/fs/msdosfs/msdosfs_vfsops.c Fri Nov 20 14:45:45 2020 (r367894) +++ head/sys/fs/msdosfs/msdosfs_vfsops.c Fri Nov 20 15:19:30 2020 (r367895) @@ -248,22 +248,28 @@ msdosfs_mount(struct mount *mp) pmp = VFSTOMSDOSFS(mp); if (!(pmp->pm_flags & MSDOSFSMNT_RONLY) && vfs_flagopt(mp->mnt_optnew, "ro", NULL, 0)) { - error = VFS_SYNC(mp, MNT_WAIT); - if (error) + if ((error = vn_start_write(NULL, &mp, V_WAIT)) != 0) return (error); + error = vfs_write_suspend_umnt(mp); + if (error != 0) + return (error); + flags = WRITECLOSE; if (mp->mnt_flag & MNT_FORCE) flags |= FORCECLOSE; error = vflush(mp, 0, flags, td); - if (error) + if (error != 0) { + vfs_write_resume(mp, 0); return (error); + } /* * Now the volume is clean. Mark it so while the * device is still rw. */ error = markvoldirty(pmp, 0); - if (error) { + if (error != 0) { + vfs_write_resume(mp, 0); (void)markvoldirty(pmp, 1); return (error); } @@ -273,6 +279,7 @@ msdosfs_mount(struct mount *mp) error = g_access(pmp->pm_cp, 0, -1, 0); g_topology_unlock(); if (error) { + vfs_write_resume(mp, 0); (void)markvoldirty(pmp, 1); return (error); } @@ -286,6 +293,7 @@ msdosfs_mount(struct mount *mp) MNT_ILOCK(mp); mp->mnt_flag |= MNT_RDONLY; MNT_IUNLOCK(mp); + vfs_write_resume(mp, 0); } else if ((pmp->pm_flags & MSDOSFSMNT_RONLY) && !vfs_flagopt(mp->mnt_optnew, "ro", NULL, 0)) { /* @@ -749,21 +757,31 @@ msdosfs_unmount(struct mount *mp, int mntflags) { struct msdosfsmount *pmp; int error, flags; + bool susp; error = flags = 0; pmp = VFSTOMSDOSFS(mp); - if ((pmp->pm_flags & MSDOSFSMNT_RONLY) == 0) - error = msdosfs_sync(mp, MNT_WAIT); + susp = (pmp->pm_flags & MSDOSFSMNT_RONLY) == 0; + + if (susp) { + error = vfs_write_suspend_umnt(mp); + if (error != 0) + return (error); + } + if ((mntflags & MNT_FORCE) != 0) flags |= FORCECLOSE; - else if (error != 0) - return (error); error = vflush(mp, 0, flags, curthread); - if (error != 0 && error != ENXIO) + if (error != 0 && error != ENXIO) { + if (susp) + vfs_write_resume(mp, VR_START_WRITE); return (error); - if ((pmp->pm_flags & MSDOSFSMNT_RONLY) == 0) { + } + if (susp) { error = markvoldirty(pmp, 0); - if (error && error != ENXIO) { + if (error != 0 && error != ENXIO) { + if (susp) + vfs_write_resume(mp, VR_START_WRITE); (void)markvoldirty(pmp, 1); return (error); } @@ -800,6 +818,9 @@ msdosfs_unmount(struct mount *mp, int mntflags) BO_UNLOCK(bo); } #endif + if (susp) + vfs_write_resume(mp, VR_START_WRITE); + g_topology_lock(); g_vfs_close(pmp->pm_cp); g_topology_unlock();