Quoting Eric W. Biederman (ebiederm@xxxxxxxxxxxx):
> From: Eric W. Biederman <ebiederm@xxxxxxxxxxxx>
>
> Add all of the necessary bioler plate to support
> multiple superblocks in sysfs.
>
> Signed-off-by: Eric W. Biederman <ebiederm@xxxxxxxxxxxx>
Acked-by: Serge Hallyn <serue@xxxxxxxxxx>
> ---
> fs/sysfs/mount.c | 58 ++++++++++++++++++++++++++++++++++++++++++++++++++++-
> fs/sysfs/sysfs.h | 3 ++
> 2 files changed, 59 insertions(+), 2 deletions(-)
>
> diff --git a/fs/sysfs/mount.c b/fs/sysfs/mount.c
> index 0cb1088..6a433ac 100644
> --- a/fs/sysfs/mount.c
> +++ b/fs/sysfs/mount.c
> @@ -71,16 +71,70 @@ static int sysfs_fill_super(struct super_block *sb, void *data, int silent)
> return 0;
> }
>
> +static int sysfs_test_super(struct super_block *sb, void *data)
> +{
> + struct sysfs_super_info *sb_info = sysfs_info(sb);
> + struct sysfs_super_info *info = data;
> + int found = 1;
> + return found;
> +}
> +
> +static int sysfs_set_super(struct super_block *sb, void *data)
> +{
> + int error;
> + error = set_anon_super(sb, data);
> + if (!error)
> + sb->s_fs_info = data;
> + return error;
> +}
> +
> static int sysfs_get_sb(struct file_system_type *fs_type,
> int flags, const char *dev_name, void *data, struct vfsmount *mnt)
> {
> - return get_sb_single(fs_type, flags, data, sysfs_fill_super, mnt);
> + struct sysfs_super_info *info;
> + struct super_block *sb;
> + int error;
> +
> + error = -ENOMEM;
> + info = kzalloc(sizeof(*info), GFP_KERNEL);
> + if (!info)
> + goto out;
> + sb = sget(fs_type, sysfs_test_super, sysfs_set_super, info);
> + if (IS_ERR(sb) || sb->s_fs_info != info)
> + kfree(info);
> + if (IS_ERR(sb)) {
> + kfree(info);
> + error = PTR_ERR(sb);
> + goto out;
> + }
> + if (!sb->s_root) {
> + sb->s_flags = flags;
> + error = sysfs_fill_super(sb, data, flags & MS_SILENT ? 1 : 0);
> + if (error) {
> + deactivate_locked_super(sb);
> + goto out;
> + }
> + sb->s_flags |= MS_ACTIVE;
> + }
> +
> + simple_set_mnt(mnt, sb);
> + error = 0;
> +out:
> + return error;
> +}
> +
> +static void sysfs_kill_sb(struct super_block *sb)
> +{
> + struct sysfs_super_info *info = sysfs_info(sb);
> +
> + kill_anon_super(sb);
> + kfree(info);
> }
>
> static struct file_system_type sysfs_fs_type = {
> .name = "sysfs",
> .get_sb = sysfs_get_sb,
> - .kill_sb = kill_anon_super,
> + .kill_sb = sysfs_kill_sb,
> };
>
> int __init sysfs_init(void)
> diff --git a/fs/sysfs/sysfs.h b/fs/sysfs/sysfs.h
> index 30f5a44..030a39d 100644
> --- a/fs/sysfs/sysfs.h
> +++ b/fs/sysfs/sysfs.h
> @@ -114,6 +114,9 @@ struct sysfs_addrm_cxt {
> /*
> * mount.c
> */
> +struct sysfs_super_info {
> +};
> +#define sysfs_info(SB) ((struct sysfs_super_info *)(SB->s_fs_info))
> extern struct sysfs_dirent sysfs_root;
> extern struct kmem_cache *sysfs_dir_cachep;
>
> --
> 1.6.5.2.143.g8cc62
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