[SCSI] sysfs: make group is_valid return a mode_t

We have a problem in scsi_transport_spi in that we need to customise
not only the visibility of the attributes, but also their mode.  Fix
this by making the is_visible() callback return a mode, with 0
indicating is not visible.

Also add a sysfs_update_group() API to allow us to change either the
visibility or mode of the files at any time on the fly.

Acked-by: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/include/linux/sysfs.h b/include/linux/sysfs.h
index 03378e3515b3..add3c5a40827 100644
--- a/include/linux/sysfs.h
+++ b/include/linux/sysfs.h
@@ -32,7 +32,7 @@ struct attribute {
 
 struct attribute_group {
         const char              *name;
-        int                     (*is_visible)(struct kobject *,
+        mode_t                  (*is_visible)(struct kobject *,
                                               struct attribute *, int);
         struct attribute        **attrs;
 };
@@ -105,6 +105,8 @@ void sysfs_remove_link(struct kobject *kobj, const char *name);
 
 int __must_check sysfs_create_group(struct kobject *kobj,
                                     const struct attribute_group *grp);
+int sysfs_update_group(struct kobject *kobj,
+                       const struct attribute_group *grp);
 void sysfs_remove_group(struct kobject *kobj,
                         const struct attribute_group *grp);
 int sysfs_add_file_to_group(struct kobject *kobj,