linux-kernel - [tip: x86/sev] fs/configfs: Add a callback to determine attribute visibility

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Date: Tue, 18 Jun 2024 09:44:58 -0000
From: "tip-bot2 for Tom Lendacky" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: Dan Williams <dan.j.williams@...el.com>,
 Tom Lendacky <thomas.lendacky@....com>,
 "Borislav Petkov (AMD)" <bp@...en8.de>, x86@...nel.org,
 linux-kernel@...r.kernel.org
Subject:
 [tip: x86/sev] fs/configfs: Add a callback to determine attribute visibility

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@....com>
AuthorDate:    Wed, 05 Jun 2024 10:18:53 -05:00
Committer:     Borislav Petkov (AMD) <bp@...en8.de>
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@...el.com>
Signed-off-by: Dan Williams <dan.j.williams@...el.com>
Signed-off-by: Tom Lendacky <thomas.lendacky@....com>
Signed-off-by: Borislav Petkov (AMD) <bp@...en8.de>
Link: https://lore.kernel.org/r/e555c8740a263fab9f83b2cbb44da1af49a2813c.1717600736.git.thomas.lendacky@amd.com
---
 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 {