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(); _______________________________________________ svn-src-head@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"
