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SubjectRe: MS_RDONLY patch (do_remount_sb and cramfs/inode.c)
On Tue, May 15, 2001 at 12:24:06PM +0200, Peter Kundrat wrote:
> On Tue, May 15, 2001 at 11:27:26AM +0200, Peter Kundrat wrote:
> > This patch does:
> > - set MS_RDONLY flag in cramfs superblock
> > - doesnt allow -w remount in do_remount_sb
> > if the filesystem has MS_RDONLY set.
>
> Oh, ignore the second part. Seems i'd have to supply remount_fs super
> op to prevent that.

How about this one ? Similar thing could be done to other fs as well.

pkx

diff -ur -x *~ -x *.o -x .* Linux-2.4.3.orig/fs/cramfs/inode.c Linux-2.4.3.isdn.kgdb/fs/cramfs/inode.c
--- Linux-2.4.3.orig/fs/cramfs/inode.c Fri Apr 6 08:09:07 2001
+++ Linux-2.4.3.isdn.kgdb/fs/cramfs/inode.c Tue May 15 12:56:32 2001
@@ -192,6 +192,8 @@
goto out;
}

+ sb->s_flags |= MS_RDONLY;
+
/* Set it all up.. */
sb->s_op = &cramfs_ops;
sb->s_root = d_alloc_root(get_cramfs_inode(sb, &super.root));
@@ -212,6 +214,14 @@
return 0;
}

+static int cramfs_remount (struct super_block * sb, int * flags, char * data)
+{
+ if (*flags & MS_RDONLY)
+ return 0;
+ else
+ return -EROFS;
+}
+
/*
* Read a cramfs directory entry.
*/
@@ -358,6 +368,7 @@

static struct super_operations cramfs_ops = {
statfs: cramfs_statfs,
+ remount_fs: cramfs_remount,
};

static DECLARE_FSTYPE_DEV(cramfs_fs_type, "cramfs", cramfs_read_super);
--
Peter Kundrat
peter@kundrat.sk
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