Aren
/
NetBSD
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

allow file system to decide if it can be downgraded from r/w to r/o

This commit is contained in:
pooka 2011-01-13 07:25:50 +00:00
parent f5c7baed05
commit 4a92140584
2 changed files with 7 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
sys/kern/vfs_syscalls.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: vfs_syscalls.c,v 1.413 2011/01/02 05:12:33 dholland Exp $ */
/* $NetBSD: vfs_syscalls.c,v 1.414 2011/01/13 07:25:50 pooka Exp $ */
/*-
* Copyright (c) 2008, 2009 The NetBSD Foundation, Inc.
@ -66,7 +66,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: vfs_syscalls.c,v 1.413 2011/01/02 05:12:33 dholland Exp $");
__KERNEL_RCSID(0, "$NetBSD: vfs_syscalls.c,v 1.414 2011/01/13 07:25:50 pooka Exp $");
#ifdef _KERNEL_OPT
#include "opt_fileassoc.h"
@ -169,7 +169,8 @@ mount_update(struct lwp *l, struct vnode *vp, const char *path, int flags,
* prevent read-write to read-only downgrades.
*/
if ((flags & (MNT_RELOAD | MNT_RDONLY)) != 0 &&
(mp->mnt_flag & MNT_RDONLY) == 0) {
(mp->mnt_flag & MNT_RDONLY) == 0 &&
(mp->mnt_iflag & IMNT_CAN_RWTORO) == 0) {
error = EOPNOTSUPP; /* Needs translation */
goto out;
}

4
sys/sys/fstypes.h
View File

@ -1,4 +1,4 @@
/* $NetBSD: fstypes.h,v 1.27 2011/01/13 07:23:39 pooka Exp $ */
/* $NetBSD: fstypes.h,v 1.28 2011/01/13 07:25:50 pooka Exp $ */
/*
* Copyright (c) 1989, 1991, 1993
@ -210,6 +210,7 @@ typedef struct fhandle fhandle_t;
#define IMNT_DTYPE 0x00000040 /* returns d_type fields */
#define IMNT_HAS_TRANS 0x00000080 /* supports transactions */
#define IMNT_MPSAFE 0x00000100 /* file system code MP safe */
#define IMNT_CAN_RWTORO 0x00000200 /* can downgrade fs to from rw to r/o */
#define __MNT_FLAGS \
__MNT_BASIC_FLAGS \
@ -254,6 +255,7 @@ typedef struct fhandle fhandle_t;
#define __IMNT_FLAG_BITS \
"\20" \
"\12IMNT_CAN_RWTORO" \
"\11IMNT_MPSAFE" \
"\10IMNT_HAS_TRANS" \
"\07IMNT_DTYPE" \