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    Subject[PATCH 09/11] sysfs: add sysfs_ns_exit routine
    Add sysfs routine sysfs_ns_exit() to allow a namespace to go away while
    sysfs is still mounted.

    The exiting namespace calls this routine and pass it a callback to be
    called for every sysfs superblocks present. The callback contains the
    necessary code to clean the superblock tag data associated with this
    namespace.

    Signed-off-by: Benjamin Thery <benjamin.thery@bull.net>
    ---
    fs/sysfs/mount.c | 21 +++++++++++++++++++++
    include/linux/sysfs.h | 8 ++++++++
    2 files changed, 29 insertions(+)

    Index: linux-mm/fs/sysfs/mount.c
    ===================================================================
    --- linux-mm.orig/fs/sysfs/mount.c
    +++ linux-mm/fs/sysfs/mount.c
    @@ -181,6 +181,27 @@ restart:
    spin_unlock(&sb_lock);
    }

    +/* Clean sysfs tags related to a given namespace when it exits */
    +void sysfs_ns_exit(void (*func)(struct sysfs_tag_info *, void *), void *data)
    +{
    + /* Allow the namespace to go away while sysfs is still mounted. */
    + struct super_block *sb;
    + mutex_lock(&sysfs_rename_mutex);
    + sysfs_grab_supers();
    + mutex_lock(&sysfs_mutex);
    + list_for_each_entry(sb, &sysfs_fs_type.fs_supers, s_instances) {
    +
    + struct sysfs_super_info *info = sysfs_info(sb);
    + /* Call the cleaning routine provided by the namespace.
    + * data is the current namespace id passed by the namespace.
    + */
    + func(&info->tag, data);
    + }
    + mutex_unlock(&sysfs_mutex);
    + sysfs_release_supers();
    + mutex_unlock(&sysfs_rename_mutex);
    +}
    +
    int __init sysfs_init(void)
    {
    int err = -ENOMEM;
    Index: linux-mm/include/linux/sysfs.h
    ===================================================================
    --- linux-mm.orig/include/linux/sysfs.h
    +++ linux-mm/include/linux/sysfs.h
    @@ -136,6 +136,9 @@ void sysfs_printk_last_file(void);
    int sysfs_enable_tagging(struct kobject *kobj,
    const struct sysfs_tagged_dir_operations *tag_ops);

    +void sysfs_ns_exit(void (*func)(struct sysfs_tag_info *, void *),
    + void *data);
    +
    extern int __must_check sysfs_init(void);

    #else /* CONFIG_SYSFS */
    @@ -249,6 +252,11 @@ static inline int sysfs_enable_tagging(s
    return 0;
    }

    +static inline void sysfs_ns_exit(void (*func)(struct sysfs_tag_info *, void *),
    + void *data)
    +{
    +}
    +
    static inline int __must_check sysfs_init(void)
    {
    return 0;
    --


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