linux-kernel - [PATCH v2 1/3] sysctl: drop sysctl_is_perm_empty_ctl

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Message-Id: <20240322-sysctl-empty-dir-v2-1-e559cf8ec7c0@weissschuh.net>
Date: Fri, 22 Mar 2024 18:05:56 +0100
From: Thomas Weißschuh <linux@...ssschuh.net>
To: "Eric W. Biederman" <ebiederm@...ssion.com>, 
 Luis Chamberlain <mcgrof@...nel.org>, Kees Cook <keescook@...omium.org>, 
 Joel Granados <j.granados@...sung.com>
Cc: linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org, 
 Thomas Weißschuh <linux@...ssschuh.net>
Subject: [PATCH v2 1/3] sysctl: drop sysctl_is_perm_empty_ctl_table

It is used only twice and those callers are simpler with
sysctl_is_perm_empty_ctl_header().
So use this sibling function.

This is part of an effort to constify definition of struct ctl_table.
For this effort the mutable member 'type' is moved from
struct ctl_table to struct ctl_table_header.
Unifying the macros sysctl_is_perm_empty_ctl_* makes this easier.

Signed-off-by: Thomas Weißschuh <linux@...ssschuh.net>
---
 fs/proc/proc_sysctl.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/fs/proc/proc_sysctl.c b/fs/proc/proc_sysctl.c
index 37cde0efee57..2f4d4329d83d 100644
--- a/fs/proc/proc_sysctl.c
+++ b/fs/proc/proc_sysctl.c
@@ -48,10 +48,8 @@ struct ctl_table_header *register_sysctl_mount_point(const char *path)
 }
 EXPORT_SYMBOL(register_sysctl_mount_point);

-#define sysctl_is_perm_empty_ctl_table(tptr)		\
-	(tptr[0].type == SYSCTL_TABLE_TYPE_PERMANENTLY_EMPTY)
 #define sysctl_is_perm_empty_ctl_header(hptr)		\
-	(sysctl_is_perm_empty_ctl_table(hptr->ctl_table))
+	(hptr->ctl_table[0].type == SYSCTL_TABLE_TYPE_PERMANENTLY_EMPTY)
 #define sysctl_set_perm_empty_ctl_header(hptr)		\
 	(hptr->ctl_table[0].type = SYSCTL_TABLE_TYPE_PERMANENTLY_EMPTY)
 #define sysctl_clear_perm_empty_ctl_header(hptr)	\
@@ -233,7 +231,7 @@ static int insert_header(struct ctl_dir *dir, struct ctl_table_header *header)

 	/* Am I creating a permanently empty directory? */
 	if (header->ctl_table_size > 0 &&
-	    sysctl_is_perm_empty_ctl_table(header->ctl_table)) {
+	    sysctl_is_perm_empty_ctl_header(header)) {
 		if (!RB_EMPTY_ROOT(&dir->root))
 			return -EINVAL;
 		sysctl_set_perm_empty_ctl_header(dir_h);
@@ -1204,7 +1202,7 @@ static bool get_links(struct ctl_dir *dir,
 	struct ctl_table *entry, *link;

 	if (header->ctl_table_size == 0 ||
-	    sysctl_is_perm_empty_ctl_table(header->ctl_table))
+	    sysctl_is_perm_empty_ctl_header(header))
 		return true;

 	/* Are there links available for every entry in table? */

-- 
2.44.0