[Intel-gfx] [PATCH v2 4/8] ocfs2: simplify subdirectory registration with register_sysctl()

Luis Chamberlain
2021-11-23T20:25:30Z

There is no need to user boiler plate code to specify a set of base
directories we're going to stuff sysctls under. Simplify this by using
register_sysctl() and specifying the directory path directly.

// pycocci sysctl-subdir-register-sysctl-simplify.cocci PATH

@c1@
expression E1;
identifier subdir, sysctls;
@@

static struct ctl_table subdir[] = {
{
.procname = E1,
.maxlen = 0,
.mode = 0555,
.child = sysctls,
},
{ }
};

@c2@
identifier c1.subdir;

expression E2;
identifier base;
@@

static struct ctl_table base[] = {
{
.procname = E2,
.maxlen = 0,
.mode = 0555,
.child = subdir,
},
{ }
};

@c3@
identifier c2.base;
identifier header;
@@

header = register_sysctl_table(base);

@r1 depends on c1 && c2 && c3@
expression c1.E1;
identifier c1.subdir, c1.sysctls;
@@

-static struct ctl_table subdir[] = {
- {
- .procname = E1,
- .maxlen = 0,
- .mode = 0555,
- .child = sysctls,
- },
- { }
-};

@r2 depends on c1 && c2 && c3@
identifier c1.subdir;

expression c2.E2;
identifier c2.base;
@@
-static struct ctl_table base[] = {
- {
- .procname = E2,
- .maxlen = 0,
- .mode = 0555,
- .child = subdir,
- },
- { }
-};

@initialize:python@
@@

def make_my_fresh_expression(s1, s2):
return '"' + s1.strip('"') + "/" + s2.strip('"') + '"'

@r3 depends on c1 && c2 && c3@
expression c1.E1;
identifier c1.sysctls;
expression c2.E2;
identifier c2.base;
identifier c3.header;
fresh identifier E3 = script:python(E2, E1) { make_my_fresh_expression(E2, E1) };
@@

header =
-register_sysctl_table(base);
+register_sysctl(E3, sysctls);

Generated-by: Coccinelle SmPL
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
---
fs/ocfs2/stackglue.c | 25 +------------------------
1 file changed, 1 insertion(+), 24 deletions(-)

diff --git a/fs/ocfs2/stackglue.c b/fs/ocfs2/stackglue.c
index 16f1bfc407f2..731558a6f27d 100644
--- a/fs/ocfs2/stackglue.c
+++ b/fs/ocfs2/stackglue.c
@@ -672,31 +672,8 @@ static struct ctl_table ocfs2_mod_table[] = {
{ }
};

-static struct ctl_table ocfs2_kern_table[] = {
- {
- .procname = "ocfs2",
- .data = NULL,
- .maxlen = 0,
- .mode = 0555,
- .child = ocfs2_mod_table
- },
- { }
-};
-
-static struct ctl_table ocfs2_root_table[] = {
- {
- .procname = "fs",
- .data = NULL,
- .maxlen = 0,
- .mode = 0555,
- .child = ocfs2_kern_table
- },
- { }
-};
-
static struct ctl_table_header *ocfs2_table_header;

-
/*
* Initialization
*/
@@ -705,7 +682,7 @@ static int __init ocfs2_stack_glue_init(void)
{
strcpy(cluster_stack_name, OCFS2_STACK_PLUGIN_O2CB);

- ocfs2_table_header = register_sysctl_table(ocfs2_root_table);
+ ocfs2_table_header = register_sysctl("fs/ocfs2", ocfs2_mod_table);
if (!ocfs2_table_header) {
printk(KERN_ERR
"ocfs2 stack glue: unable to register sysctl\n");
--
2.33.0