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[src/trunk]: src/sys Change the protocol to update a mounted file system from...
details: https://anonhg.NetBSD.org/src/rev/2123c116e5bd
branches: trunk
changeset: 822100:2123c116e5bd
user: hannken <hannken%NetBSD.org@localhost>
date: Wed Mar 01 10:44:47 2017 +0000
description:
Change the protocol to update a mounted file system from read-write
to read-only and vice versa:
- Add an internal flag IMNT_WANTRDONLY.
- Set either IMNT_WANTRDWR or IMNT_WANTRDONLY if going from or to read-only.
- After successfull call to VFS_MOUNT() set or clear MNT_RDONLY.
Adapt tmpfs and rumpfs to the new protocol. Other file systems will be
updated when they get the IMNT_CAN_RWTORO property.
Welcome to 7.99.64
diffstat:
sys/fs/tmpfs/tmpfs.h | 5 +----
sys/fs/tmpfs/tmpfs_vfsops.c | 13 +++----------
sys/kern/vfs_syscalls.c | 22 +++++++++++++---------
sys/rump/librump/rumpvfs/rumpfs.c | 17 +++--------------
sys/sys/fstypes.h | 4 +++-
sys/sys/param.h | 4 ++--
6 files changed, 25 insertions(+), 40 deletions(-)
diffs (245 lines):
diff -r 970efc7fa85b -r 2123c116e5bd sys/fs/tmpfs/tmpfs.h
--- a/sys/fs/tmpfs/tmpfs.h Wed Mar 01 10:43:37 2017 +0000
+++ b/sys/fs/tmpfs/tmpfs.h Wed Mar 01 10:44:47 2017 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: tmpfs.h,v 1.53 2017/01/27 10:47:54 hannken Exp $ */
+/* $NetBSD: tmpfs.h,v 1.54 2017/03/01 10:44:47 hannken Exp $ */
/*
* Copyright (c) 2005, 2006, 2007 The NetBSD Foundation, Inc.
@@ -217,9 +217,6 @@
uint64_t tm_bytes_used;
kmutex_t tm_acc_lock;
- /* Read-only indicator. */
- bool tm_rdonly;
-
/* Pointer to the root inode. */
tmpfs_node_t * tm_root;
diff -r 970efc7fa85b -r 2123c116e5bd sys/fs/tmpfs/tmpfs_vfsops.c
--- a/sys/fs/tmpfs/tmpfs_vfsops.c Wed Mar 01 10:43:37 2017 +0000
+++ b/sys/fs/tmpfs/tmpfs_vfsops.c Wed Mar 01 10:44:47 2017 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: tmpfs_vfsops.c,v 1.70 2017/02/17 08:31:25 hannken Exp $ */
+/* $NetBSD: tmpfs_vfsops.c,v 1.71 2017/03/01 10:44:47 hannken Exp $ */
/*
* Copyright (c) 2005, 2006, 2007 The NetBSD Foundation, Inc.
@@ -42,7 +42,7 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: tmpfs_vfsops.c,v 1.70 2017/02/17 08:31:25 hannken Exp $");
+__KERNEL_RCSID(0, "$NetBSD: tmpfs_vfsops.c,v 1.71 2017/03/01 10:44:47 hannken Exp $");
#include <sys/param.h>
#include <sys/atomic.h>
@@ -160,7 +160,7 @@
tmp = VFS_TO_TMPFS(mp);
if (set_nodes && nodes < tmp->tm_nodes_cnt)
return EBUSY;
- if (!tmp->tm_rdonly && (mp->mnt_flag & MNT_RDONLY)) {
+ if ((mp->mnt_iflag & IMNT_WANTRDONLY)) {
/* Changing from read/write to read-only. */
flags = WRITECLOSE;
if ((mp->mnt_flag & MNT_FORCE))
@@ -168,11 +168,6 @@
error = vflush(mp, NULL, flags);
if (error)
return error;
- tmp->tm_rdonly = true;
- }
- if (tmp->tm_rdonly && (mp->mnt_flag & IMNT_WANTRDWR)) {
- /* Changing from read-only to read/write. */
- tmp->tm_rdonly = false;
}
if (set_memlimit) {
if ((error = tmpfs_mntmem_set(tmp, memlimit)) != 0)
@@ -192,8 +187,6 @@
if (tmp == NULL)
return ENOMEM;
- if ((mp->mnt_flag & MNT_RDONLY))
- tmp->tm_rdonly = true;
tmp->tm_nodes_max = nodes;
tmp->tm_nodes_cnt = 0;
LIST_INIT(&tmp->tm_nodes);
diff -r 970efc7fa85b -r 2123c116e5bd sys/kern/vfs_syscalls.c
--- a/sys/kern/vfs_syscalls.c Wed Mar 01 10:43:37 2017 +0000
+++ b/sys/kern/vfs_syscalls.c Wed Mar 01 10:44:47 2017 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: vfs_syscalls.c,v 1.506 2017/02/17 08:26:07 hannken Exp $ */
+/* $NetBSD: vfs_syscalls.c,v 1.507 2017/03/01 10:44:47 hannken Exp $ */
/*-
* Copyright (c) 2008, 2009 The NetBSD Foundation, Inc.
@@ -70,7 +70,7 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: vfs_syscalls.c,v 1.506 2017/02/17 08:26:07 hannken Exp $");
+__KERNEL_RCSID(0, "$NetBSD: vfs_syscalls.c,v 1.507 2017/03/01 10:44:47 hannken Exp $");
#ifdef _KERNEL_OPT
#include "opt_fileassoc.h"
@@ -295,12 +295,14 @@
/*
* Set the mount level flags.
*/
- if (flags & MNT_RDONLY)
- mp->mnt_flag |= MNT_RDONLY;
- else if (mp->mnt_flag & MNT_RDONLY)
- mp->mnt_iflag |= IMNT_WANTRDWR;
+ if ((flags & MNT_RDONLY) != (mp->mnt_flag & MNT_RDONLY)) {
+ if ((flags & MNT_RDONLY))
+ mp->mnt_iflag |= IMNT_WANTRDONLY;
+ else
+ mp->mnt_iflag |= IMNT_WANTRDWR;
+ }
mp->mnt_flag &= ~MNT_BASIC_FLAGS;
- mp->mnt_flag |= flags & MNT_BASIC_FLAGS;
+ mp->mnt_flag |= (flags & ~MNT_RDONLY) & MNT_BASIC_FLAGS;
error = VFS_MOUNT(mp, path, data, data_len);
if (error && data != NULL) {
@@ -321,12 +323,14 @@
error = error2;
}
- if (mp->mnt_iflag & IMNT_WANTRDWR)
+ if (error == 0 && (mp->mnt_iflag & IMNT_WANTRDONLY))
+ mp->mnt_flag |= MNT_RDONLY;
+ else if (error == 0 && (mp->mnt_iflag & IMNT_WANTRDWR))
mp->mnt_flag &= ~MNT_RDONLY;
if (error)
mp->mnt_flag = saved_flags;
mp->mnt_flag &= ~MNT_OP_FLAGS;
- mp->mnt_iflag &= ~IMNT_WANTRDWR;
+ mp->mnt_iflag &= ~(IMNT_WANTRDONLY | IMNT_WANTRDWR);
if ((mp->mnt_flag & (MNT_RDONLY | MNT_ASYNC)) == 0) {
if ((mp->mnt_iflag & IMNT_ONWORKLIST) == 0)
vfs_syncer_add_to_worklist(mp);
diff -r 970efc7fa85b -r 2123c116e5bd sys/rump/librump/rumpvfs/rumpfs.c
--- a/sys/rump/librump/rumpvfs/rumpfs.c Wed Mar 01 10:43:37 2017 +0000
+++ b/sys/rump/librump/rumpvfs/rumpfs.c Wed Mar 01 10:44:47 2017 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: rumpfs.c,v 1.144 2017/02/17 08:31:26 hannken Exp $ */
+/* $NetBSD: rumpfs.c,v 1.145 2017/03/01 10:44:47 hannken Exp $ */
/*
* Copyright (c) 2009, 2010, 2011 Antti Kantee. All Rights Reserved.
@@ -26,7 +26,7 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: rumpfs.c,v 1.144 2017/02/17 08:31:26 hannken Exp $");
+__KERNEL_RCSID(0, "$NetBSD: rumpfs.c,v 1.145 2017/03/01 10:44:47 hannken Exp $");
#include <sys/param.h>
#include <sys/atomic.h>
@@ -216,7 +216,6 @@
struct rumpfs_mount {
struct vnode *rfsmp_rvp;
- bool rfsmp_rdonly;
};
#define INO_WHITEOUT 1
@@ -1806,7 +1805,6 @@
}
rfsmp->rfsmp_rvp->v_vflag |= VV_ROOT;
- rfsmp->rfsmp_rdonly = (mp->mnt_flag & MNT_RDONLY) != 0;
mp->mnt_data = rfsmp;
mp->mnt_stat.f_namemax = RUMPFS_MAXNAMLEN;
@@ -1822,14 +1820,13 @@
int
rumpfs_mount(struct mount *mp, const char *mntpath, void *arg, size_t *alen)
{
- struct rumpfs_mount *rfsmp = mp->mnt_data;
int error, flags;
if (mp->mnt_flag & MNT_GETARGS) {
return 0;
}
if (mp->mnt_flag & MNT_UPDATE) {
- if (!rfsmp->rfsmp_rdonly && (mp->mnt_flag & MNT_RDONLY)) {
+ if ((mp->mnt_iflag & IMNT_WANTRDONLY)) {
/* Changing from read/write to read-only. */
flags = WRITECLOSE;
if ((mp->mnt_flag & MNT_FORCE))
@@ -1837,11 +1834,6 @@
error = vflush(mp, NULL, flags);
if (error)
return error;
- rfsmp->rfsmp_rdonly = true;
- }
- if (rfsmp->rfsmp_rdonly && (mp->mnt_flag & IMNT_WANTRDWR)) {
- /* Changing from read-only to read/write. */
- rfsmp->rfsmp_rdonly = false;
}
return 0;
}
@@ -1966,7 +1958,6 @@
rumpfs_mountroot()
{
struct mount *mp;
- struct rumpfs_mount *rfsmp;
int error;
if ((error = vfs_rootmountalloc(MOUNT_RUMPFS, "rootdev", &mp)) != 0) {
@@ -1984,9 +1975,7 @@
if (error)
panic("set_statvfs_info failed for rootfs: %d", error);
- rfsmp = mp->mnt_data;
mp->mnt_flag &= ~MNT_RDONLY;
- rfsmp->rfsmp_rdonly = false;
vfs_unbusy(mp, false, NULL);
return 0;
diff -r 970efc7fa85b -r 2123c116e5bd sys/sys/fstypes.h
--- a/sys/sys/fstypes.h Wed Mar 01 10:43:37 2017 +0000
+++ b/sys/sys/fstypes.h Wed Mar 01 10:44:47 2017 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: fstypes.h,v 1.34 2016/10/08 17:28:17 ast Exp $ */
+/* $NetBSD: fstypes.h,v 1.35 2017/03/01 10:44:47 hannken Exp $ */
/*
* Copyright (c) 1989, 1991, 1993
@@ -216,6 +216,7 @@
#define IMNT_GONE 0x00000001 /* filesystem is gone.. */
#define IMNT_UNMOUNT 0x00000002 /* unmount in progress */
#define IMNT_WANTRDWR 0x00000004 /* upgrade to read/write requested */
+#define IMNT_WANTRDONLY 0x00000008 /* upgrade to readonly requested */
#define IMNT_DTYPE 0x00000040 /* returns d_type fields */
#define IMNT_HAS_TRANS 0x00000080 /* supports transactions */
#define IMNT_MPSAFE 0x00000100 /* file system code MP safe */
@@ -270,6 +271,7 @@
"\11IMNT_MPSAFE" \
"\10IMNT_HAS_TRANS" \
"\07IMNT_DTYPE" \
+ "\04IMNT_WANTRDONLY" \
"\03IMNT_WANTRDWR" \
"\02IMNT_UNMOUNT" \
"\01IMNT_GONE"
diff -r 970efc7fa85b -r 2123c116e5bd sys/sys/param.h
--- a/sys/sys/param.h Wed Mar 01 10:43:37 2017 +0000
+++ b/sys/sys/param.h Wed Mar 01 10:44:47 2017 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: param.h,v 1.530 2017/02/27 21:33:47 jdolecek Exp $ */
+/* $NetBSD: param.h,v 1.531 2017/03/01 10:44:47 hannken Exp $ */
/*-
* Copyright (c) 1982, 1986, 1989, 1993
@@ -67,7 +67,7 @@
* 2.99.9 (299000900)
*/
-#define __NetBSD_Version__ 799006300 /* NetBSD 7.99.63 */
+#define __NetBSD_Version__ 799006400 /* NetBSD 7.99.64 */
#define __NetBSD_Prereq__(M,m,p) (((((M) * 100000000) + \
(m) * 1000000) + (p) * 100) <= __NetBSD_Version__)
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