[PATCH 15/17] drbd: move global variables to drbd namespace and make some static

From: Philipp Reisner
Date: Thu Aug 24 2017 - 17:24:34 EST

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From: Roland Kammerer <roland.kammerer@xxxxxxxxxx>

This is a follow-up to Gregs complaints that drbd clutteres the global
namespace.
Some of DRBD's module parameters are only used within one compilation
unit. Make these static.

Signed-off-by: Roland Kammerer <roland.kammerer@xxxxxxxxxx>
Signed-off-by: Philipp Reisner <philipp.reisner@xxxxxxxxxx>
Signed-off-by: Lars Ellenberg <lars.ellenberg@xxxxxxxxxx>

diff --git a/drivers/block/drbd/drbd_int.h b/drivers/block/drbd/drbd_int.h
index 61596af..7e8589c 100644
--- a/drivers/block/drbd/drbd_int.h
+++ b/drivers/block/drbd/drbd_int.h
@@ -63,19 +63,15 @@
# define __must_hold(x)
#endif

-/* module parameter, defined in drbd_main.c */
-extern unsigned int minor_count;
-extern bool disable_sendpage;
-extern bool allow_oos;
-void tl_abort_disk_io(struct drbd_device *device);
-
+/* shared module parameters, defined in drbd_main.c */
#ifdef CONFIG_DRBD_FAULT_INJECTION
-extern int enable_faults;
-extern int fault_rate;
-extern int fault_devs;
+extern int drbd_enable_faults;
+extern int drbd_fault_rate;
#endif

+extern unsigned int drbd_minor_count;
extern char drbd_usermode_helper[];
+extern int drbd_proc_details;

/* This is used to stop/restart our threads.
@@ -181,8 +177,8 @@ _drbd_insert_fault(struct drbd_device *device, unsigned int type);
static inline int
drbd_insert_fault(struct drbd_device *device, unsigned int type) {
#ifdef CONFIG_DRBD_FAULT_INJECTION
- return fault_rate &&
- (enable_faults & (1<<type)) &&
+ return drbd_fault_rate &&
+ (drbd_enable_faults & (1<<type)) &&
_drbd_insert_fault(device, type);
#else
return 0;
@@ -1466,8 +1462,6 @@ extern struct drbd_resource *drbd_find_resource(const char *name);
extern void drbd_destroy_resource(struct kref *kref);
extern void conn_free_crypto(struct drbd_connection *connection);

-extern int proc_details;
-
/* drbd_req */
extern void do_submit(struct work_struct *ws);
extern void __drbd_make_request(struct drbd_device *, struct bio *, unsigned long);
diff --git a/drivers/block/drbd/drbd_main.c b/drivers/block/drbd/drbd_main.c
index bdd9ab2..56a5436 100644
--- a/drivers/block/drbd/drbd_main.c
+++ b/drivers/block/drbd/drbd_main.c
@@ -77,40 +77,40 @@ MODULE_PARM_DESC(minor_count, "Approximate number of drbd devices ("
MODULE_ALIAS_BLOCKDEV_MAJOR(DRBD_MAJOR);

#include <linux/moduleparam.h>
-/* allow_open_on_secondary */
-MODULE_PARM_DESC(allow_oos, "DONT USE!");
/* thanks to these macros, if compiled into the kernel (not-module),
- * this becomes the boot parameter drbd.minor_count */
-module_param(minor_count, uint, 0444);
-module_param(disable_sendpage, bool, 0644);
-module_param(allow_oos, bool, 0);
-module_param(proc_details, int, 0644);
+ * these become boot parameters (e.g., drbd.minor_count) */

#ifdef CONFIG_DRBD_FAULT_INJECTION
-int enable_faults;
-int fault_rate;
-static int fault_count;
-int fault_devs;
+int drbd_enable_faults;
+int drbd_fault_rate;
+static int drbd_fault_count;
+static int drbd_fault_devs;
/* bitmap of enabled faults */
-module_param(enable_faults, int, 0664);
+module_param_named(enable_faults, drbd_enable_faults, int, 0664);
/* fault rate % value - applies to all enabled faults */
-module_param(fault_rate, int, 0664);
+module_param_named(fault_rate, drbd_fault_rate, int, 0664);
/* count of faults inserted */
-module_param(fault_count, int, 0664);
+module_param_named(fault_count, drbd_fault_count, int, 0664);
/* bitmap of devices to insert faults on */
-module_param(fault_devs, int, 0644);
+module_param_named(fault_devs, drbd_fault_devs, int, 0644);
#endif

-/* module parameter, defined */
-unsigned int minor_count = DRBD_MINOR_COUNT_DEF;
-bool disable_sendpage;
-bool allow_oos;
-int proc_details; /* Detail level in proc drbd*/
-
+/* module parameters we can keep static */
+static bool drbd_allow_oos; /* allow_open_on_secondary */
+static bool drbd_disable_sendpage;
+MODULE_PARM_DESC(allow_oos, "DONT USE!");
+module_param_named(allow_oos, drbd_allow_oos, bool, 0);
+module_param_named(disable_sendpage, drbd_disable_sendpage, bool, 0644);
+
+/* module parameters we share */
+int drbd_proc_details; /* Detail level in proc drbd*/
+module_param_named(proc_details, drbd_proc_details, int, 0644);
+/* module parameters shared with defaults */
+unsigned int drbd_minor_count = DRBD_MINOR_COUNT_DEF;
/* Module parameter for setting the user mode helper program
* to run. Default is /sbin/drbdadm */
char drbd_usermode_helper[80] = "/sbin/drbdadm";
-
+module_param_named(minor_count, drbd_minor_count, uint, 0444);
module_param_string(usermode_helper, drbd_usermode_helper, sizeof(drbd_usermode_helper), 0644);

/* in 2.6.x, our device mapping and config info contains our virtual gendisks
@@ -1562,7 +1562,7 @@ static int _drbd_send_page(struct drbd_peer_device *peer_device, struct page *pa
* put_page(); and would cause either a VM_BUG directly, or
* __page_cache_release a page that would actually still be referenced
* by someone, leading to some obscure delayed Oops somewhere else. */
- if (disable_sendpage || (page_count(page) < 1) || PageSlab(page))
+ if (drbd_disable_sendpage || (page_count(page) < 1) || PageSlab(page))
return _drbd_no_send_page(peer_device, page, offset, size, msg_flags);

msg_flags |= MSG_NOSIGNAL;
@@ -1934,7 +1934,7 @@ static int drbd_open(struct block_device *bdev, fmode_t mode)
if (device->state.role != R_PRIMARY) {
if (mode & FMODE_WRITE)
rv = -EROFS;
- else if (!allow_oos)
+ else if (!drbd_allow_oos)
rv = -EMEDIUMTYPE;
}

@@ -2142,7 +2142,7 @@ static void drbd_destroy_mempools(void)
static int drbd_create_mempools(void)
{
struct page *page;
- const int number = (DRBD_MAX_BIO_SIZE/PAGE_SIZE) * minor_count;
+ const int number = (DRBD_MAX_BIO_SIZE/PAGE_SIZE) * drbd_minor_count;
int i;

/* prepare our caches and mempools */
@@ -2984,8 +2984,8 @@ static int __init drbd_init(void)
{
int err;

- if (minor_count < DRBD_MINOR_COUNT_MIN || minor_count > DRBD_MINOR_COUNT_MAX) {
- pr_err("invalid minor_count (%d)\n", minor_count);
+ if (drbd_minor_count < DRBD_MINOR_COUNT_MIN || drbd_minor_count > DRBD_MINOR_COUNT_MAX) {
+ pr_err("invalid minor_count (%d)\n", drbd_minor_count);
#ifdef MODULE
return -EINVAL;
#else
@@ -3912,12 +3912,12 @@ _drbd_insert_fault(struct drbd_device *device, unsigned int type)
static struct fault_random_state rrs = {0, 0};

unsigned int ret = (
- (fault_devs == 0 ||
- ((1 << device_to_minor(device)) & fault_devs) != 0) &&
- (((_drbd_fault_random(&rrs) % 100) + 1) <= fault_rate));
+ (drbd_fault_devs == 0 ||
+ ((1 << device_to_minor(device)) & drbd_fault_devs) != 0) &&
+ (((_drbd_fault_random(&rrs) % 100) + 1) <= drbd_fault_rate));

if (ret) {
- fault_count++;
+ drbd_fault_count++;

if (__ratelimit(&drbd_ratelimit_state))
drbd_warn(device, "***Simulating %s failure\n",
diff --git a/drivers/block/drbd/drbd_proc.c b/drivers/block/drbd/drbd_proc.c
index fc0f627..582caeb 100644
--- a/drivers/block/drbd/drbd_proc.c
+++ b/drivers/block/drbd/drbd_proc.c
@@ -179,7 +179,7 @@ static void drbd_syncer_progress(struct drbd_device *device, struct seq_file *se
seq_printf_with_thousands_grouping(seq, dbdt);
seq_puts(seq, " (");
/* ------------------------- ~3s average ------------------------ */
- if (proc_details >= 1) {
+ if (drbd_proc_details >= 1) {
/* this is what drbd_rs_should_slow_down() uses */
i = (device->rs_last_mark + DRBD_SYNC_MARKS-1) % DRBD_SYNC_MARKS;
dt = (jiffies - device->rs_mark_time[i]) / HZ;
@@ -209,7 +209,7 @@ static void drbd_syncer_progress(struct drbd_device *device, struct seq_file *se
}
seq_printf(seq, " K/sec%s\n", stalled ? " (stalled)" : "");

- if (proc_details >= 1) {
+ if (drbd_proc_details >= 1) {
/* 64 bit:
* we convert to sectors in the display below. */
unsigned long bm_bits = drbd_bm_bits(device);
@@ -332,13 +332,13 @@ static int drbd_seq_show(struct seq_file *seq, void *v)
state.conn == C_VERIFY_T)
drbd_syncer_progress(device, seq, state);

- if (proc_details >= 1 && get_ldev_if_state(device, D_FAILED)) {
+ if (drbd_proc_details >= 1 && get_ldev_if_state(device, D_FAILED)) {
lc_seq_printf_stats(seq, device->resync);
lc_seq_printf_stats(seq, device->act_log);
put_ldev(device);
}

- if (proc_details >= 2)
+ if (drbd_proc_details >= 2)
seq_printf(seq, "\tblocked on activity log: %d\n", atomic_read(&device->ap_actlog_cnt));
}
rcu_read_unlock();
diff --git a/drivers/block/drbd/drbd_receiver.c b/drivers/block/drbd/drbd_receiver.c
index 5e090a1..4e8a543 100644
--- a/drivers/block/drbd/drbd_receiver.c
+++ b/drivers/block/drbd/drbd_receiver.c
@@ -332,7 +332,7 @@ static void drbd_free_pages(struct drbd_device *device, struct page *page, int i
if (page == NULL)
return;

- if (drbd_pp_vacant > (DRBD_MAX_BIO_SIZE/PAGE_SIZE) * minor_count)
+ if (drbd_pp_vacant > (DRBD_MAX_BIO_SIZE/PAGE_SIZE) * drbd_minor_count)
i = page_chain_free(page);
else {
struct page *tmp;
--
2.7.4

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