The following commit has been merged into the x86/sev branch of tip:
Commit-ID: 0e6a35b93745bb2d8b921fd0520ef730489d41a2
Gitweb: https://git.kernel.org/tip/0e6a35b93745bb2d8b921fd0520ef730489d41a2
Author: Tom Lendacky <thomas.lendacky@xxxxxxx>
AuthorDate: Wed, 05 Jun 2024 10:18:53 -05:00
Committer: Borislav Petkov (AMD) <bp@xxxxxxxxx>
CommitterDate: Mon, 17 Jun 2024 20:42:57 +02:00
fs/configfs: Add a callback to determine attribute visibility
In order to support dynamic decisions as to whether an attribute should be
created, add a callback that returns a bool to indicate whether the
attribute should be displayed. If no callback is registered, the attribute
is displayed by default.
Co-developed-by: Dan Williams <dan.j.williams@xxxxxxxxx>
Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx>
Signed-off-by: Tom Lendacky <thomas.lendacky@xxxxxxx>
Signed-off-by: Borislav Petkov (AMD) <bp@xxxxxxxxx>
Link: https://lore.kernel.org/r/e555c8740a263fab9f83b2cbb44da1af49a2813c.1717600736.git.thomas.lendacky@xxxxxxx
---
fs/configfs/dir.c | 10 ++++++++++
include/linux/configfs.h | 3 +++
2 files changed, 13 insertions(+)
diff --git a/fs/configfs/dir.c b/fs/configfs/dir.c
index 18677cd..43d6bde 100644
--- a/fs/configfs/dir.c
+++ b/fs/configfs/dir.c
@@ -580,6 +580,7 @@ static void detach_attrs(struct config_item * item)
static int populate_attrs(struct config_item *item)
{
const struct config_item_type *t = item->ci_type;
+ struct configfs_group_operations *ops;
struct configfs_attribute *attr;
struct configfs_bin_attribute *bin_attr;
int error = 0;
@@ -587,14 +588,23 @@ static int populate_attrs(struct config_item *item)
if (!t)
return -EINVAL;
+
+ ops = t->ct_group_ops;
+
if (t->ct_attrs) {
for (i = 0; (attr = t->ct_attrs[i]) != NULL; i++) {
+ if (ops && ops->is_visible && !ops->is_visible(item, attr, i))
+ continue;
+
if ((error = configfs_create_file(item, attr)))
break;
}
}
if (t->ct_bin_attrs) {
for (i = 0; (bin_attr = t->ct_bin_attrs[i]) != NULL; i++) {
+ if (ops && ops->is_bin_visible && !ops->is_bin_visible(item, bin_attr, i))
+ continue;
+
error = configfs_create_bin_file(item, bin_attr);
if (error)
break;
diff --git a/include/linux/configfs.h b/include/linux/configfs.h
index 2606711..c771e9d 100644
--- a/include/linux/configfs.h
+++ b/include/linux/configfs.h
@@ -216,6 +216,9 @@ struct configfs_group_operations {
struct config_group *(*make_group)(struct config_group *group, const char *name);
void (*disconnect_notify)(struct config_group *group, struct config_item *item);
void (*drop_item)(struct config_group *group, struct config_item *item);
+ bool (*is_visible)(struct config_item *item, struct configfs_attribute *attr, int n);
+ bool (*is_bin_visible)(struct config_item *item, struct configfs_bin_attribute *attr,
+ int n);
};
struct configfs_subsystem {
|