virtio-fs: don't show mount options

Virtio-fs does not accept any mount options, so it's confusing and wrong to
show any in /proc/mounts.

Reported-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>

diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h
index 956aeaf..d148188 100644 (file)
--- a/fs/fuse/fuse_i.h
+++ b/fs/fuse/fuse_i.h
@@ -479,6 +479,7 @@ struct fuse_fs_context {
        bool destroy:1;
        bool no_control:1;
        bool no_force_umount:1;
+       bool no_mount_options:1;
        unsigned int max_read;
        unsigned int blksize;
        const char *subtype;
@@ -713,6 +714,9 @@ struct fuse_conn {
        /** Do not allow MNT_FORCE umount */
        unsigned int no_force_umount:1;
 
+       /* Do not show mount options */
+       unsigned int no_mount_options:1;
+
        /** The number of requests waiting for completion */
        atomic_t num_waiting;
 

diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
index e040e2a..16aec32 100644 (file)
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -558,6 +558,9 @@ static int fuse_show_options(struct seq_file *m, struct dentry *root)
        struct super_block *sb = root->d_sb;
        struct fuse_conn *fc = get_fuse_conn_super(sb);
 
+       if (fc->no_mount_options)
+               return 0;
+
        seq_printf(m, ",user_id=%u", from_kuid_munged(fc->user_ns, fc->user_id));
        seq_printf(m, ",group_id=%u", from_kgid_munged(fc->user_ns, fc->group_id));
        if (fc->default_permissions)
@@ -1180,6 +1183,7 @@ int fuse_fill_super_common(struct super_block *sb, struct fuse_fs_context *ctx)
        fc->destroy = ctx->destroy;
        fc->no_control = ctx->no_control;
        fc->no_force_umount = ctx->no_force_umount;
+       fc->no_mount_options = ctx->no_mount_options;
 
        err = -ENOMEM;
        root = fuse_get_root_inode(sb, ctx->rootmode);

diff --git a/fs/fuse/virtio_fs.c b/fs/fuse/virtio_fs.c
index 6af3f13..e22a0c0 100644 (file)
--- a/fs/fuse/virtio_fs.c
+++ b/fs/fuse/virtio_fs.c
@@ -992,6 +992,7 @@ static int virtio_fs_fill_super(struct super_block *sb)
                .destroy = true,
                .no_control = true,
                .no_force_umount = true,
+               .no_mount_options = true,
        };
 
        mutex_lock(&virtio_fs_mutex);