[PATCH 26/30] drbd: code cleanups without semantic changes

From: Philipp Reisner
Date: Mon Apr 25 2016 - 08:18:36 EST

From: Fabian Frederick <fabf@xxxxxxxxx>

This contains various cosmetic fixes ranging from simple typos to
const-ifying, and using booleans properly.

Original commit messages from Fabian's patch set:
drbd: debugfs: constify drbd_version_fops
drbd: use seq_put instead of seq_print where possible
drbd: include linux/uaccess.h instead of asm/uaccess.h
drbd: use const char * const for drbd strings
drbd: kerneldoc warning fix in w_e_end_data_req()
drbd: use unsigned for one bit fields
drbd: use bool for peer is_ states
drbd: fix typo
drbd: use | for bitmask combination
drbd: use true/false for bool
drbd: fix drbd_bm_init() comments
drbd: introduce peer state union
drbd: fix maybe_pull_ahead() locking comments
drbd: use bool for growing
drbd: remove redundant declarations
drbd: replace if/BUG by BUG_ON

Signed-off-by: Fabian Frederick <fabf@xxxxxxxxx>
Signed-off-by: Roland Kammerer <roland.kammerer@xxxxxxxxxx>
---
drivers/block/drbd/drbd_bitmap.c | 6 +++---
drivers/block/drbd/drbd_debugfs.c | 2 +-
drivers/block/drbd/drbd_int.h | 4 +---
drivers/block/drbd/drbd_interval.h | 14 +++++++-------
drivers/block/drbd/drbd_main.c | 2 +-
drivers/block/drbd/drbd_nl.c | 14 ++++++++------
drivers/block/drbd/drbd_proc.c | 30 +++++++++++++++---------------
drivers/block/drbd/drbd_receiver.c | 8 ++++----
drivers/block/drbd/drbd_req.c | 2 +-
drivers/block/drbd/drbd_state.c | 4 +---
drivers/block/drbd/drbd_state.h | 2 +-
drivers/block/drbd/drbd_strings.c | 8 ++++----
drivers/block/drbd/drbd_worker.c | 9 ++++-----
include/linux/drbd.h | 8 ++++++++
14 files changed, 59 insertions(+), 54 deletions(-)

diff --git a/drivers/block/drbd/drbd_bitmap.c b/drivers/block/drbd/drbd_bitmap.c
index 92d6fc0..17e5e60 100644
--- a/drivers/block/drbd/drbd_bitmap.c
+++ b/drivers/block/drbd/drbd_bitmap.c
@@ -427,8 +427,7 @@ static struct page **bm_realloc_pages(struct drbd_bitmap *b, unsigned long want)
}

/*
- * called on driver init only. TODO call when a device is created.
- * allocates the drbd_bitmap, and stores it in device->bitmap.
+ * allocates the drbd_bitmap and stores it in device->bitmap.
*/
int drbd_bm_init(struct drbd_device *device)
{
@@ -633,7 +632,8 @@ int drbd_bm_resize(struct drbd_device *device, sector_t capacity, int set_new_bi
unsigned long bits, words, owords, obits;
unsigned long want, have, onpages; /* number of pages */
struct page **npages, **opages = NULL;
- int err = 0, growing;
+ int err = 0;
+ bool growing;

if (!expect(b))
return -ENOMEM;
diff --git a/drivers/block/drbd/drbd_debugfs.c b/drivers/block/drbd/drbd_debugfs.c
index 8a90812..be91a8d 100644
--- a/drivers/block/drbd/drbd_debugfs.c
+++ b/drivers/block/drbd/drbd_debugfs.c
@@ -903,7 +903,7 @@ static int drbd_version_open(struct inode *inode, struct file *file)
return single_open(file, drbd_version_show, NULL);
}

-static struct file_operations drbd_version_fops = {
+static const struct file_operations drbd_version_fops = {
.owner = THIS_MODULE,
.open = drbd_version_open,
.llseek = seq_lseek,
diff --git a/drivers/block/drbd/drbd_int.h b/drivers/block/drbd/drbd_int.h
index cb47809..acb1462 100644
--- a/drivers/block/drbd/drbd_int.h
+++ b/drivers/block/drbd/drbd_int.h
@@ -1499,7 +1499,7 @@ extern enum drbd_state_rv drbd_set_role(struct drbd_device *device,
int force);
extern bool conn_try_outdate_peer(struct drbd_connection *connection);
extern void conn_try_outdate_peer_async(struct drbd_connection *connection);
-extern int conn_khelper(struct drbd_connection *connection, char *cmd);
+extern enum drbd_peer_state conn_khelper(struct drbd_connection *connection, char *cmd);
extern int drbd_khelper(struct drbd_device *device, char *cmd);

/* drbd_worker.c */
@@ -1648,8 +1648,6 @@ void drbd_bump_write_ordering(struct drbd_resource *resource, struct drbd_backin
/* drbd_proc.c */
extern struct proc_dir_entry *drbd_proc;
extern const struct file_operations drbd_proc_fops;
-extern const char *drbd_conn_str(enum drbd_conns s);
-extern const char *drbd_role_str(enum drbd_role s);

/* drbd_actlog.c */
extern bool drbd_al_begin_io_prepare(struct drbd_device *device, struct drbd_interval *i);
diff --git a/drivers/block/drbd/drbd_interval.h b/drivers/block/drbd/drbd_interval.h
index f210543..23c5a94 100644
--- a/drivers/block/drbd/drbd_interval.h
+++ b/drivers/block/drbd/drbd_interval.h
@@ -6,13 +6,13 @@

struct drbd_interval {
struct rb_node rb;
- sector_t sector; /* start sector of the interval */
- unsigned int size; /* size in bytes */
- sector_t end; /* highest interval end in subtree */
- int local:1 /* local or remote request? */;
- int waiting:1; /* someone is waiting for this to complete */
- int completed:1; /* this has been completed already;
- * ignore for conflict detection */
+ sector_t sector; /* start sector of the interval */
+ unsigned int size; /* size in bytes */
+ sector_t end; /* highest interval end in subtree */
+ unsigned int local:1 /* local or remote request? */;
+ unsigned int waiting:1; /* someone is waiting for completion */
+ unsigned int completed:1; /* this has been completed already;
+ * ignore for conflict detection */
};

static inline void drbd_clear_interval(struct drbd_interval *i)
diff --git a/drivers/block/drbd/drbd_main.c b/drivers/block/drbd/drbd_main.c
index e3aff25..5c8f6c6 100644
--- a/drivers/block/drbd/drbd_main.c
+++ b/drivers/block/drbd/drbd_main.c
@@ -31,7 +31,7 @@
#include <linux/module.h>
#include <linux/jiffies.h>
#include <linux/drbd.h>
-#include <asm/uaccess.h>
+#include <linux/uaccess.h>
#include <asm/types.h>
#include <net/sock.h>
#include <linux/ctype.h>
diff --git a/drivers/block/drbd/drbd_nl.c b/drivers/block/drbd/drbd_nl.c
index 3704fad..adcb8b0 100644
--- a/drivers/block/drbd/drbd_nl.c
+++ b/drivers/block/drbd/drbd_nl.c
@@ -387,7 +387,7 @@ int drbd_khelper(struct drbd_device *device, char *cmd)
return ret;
}

-int conn_khelper(struct drbd_connection *connection, char *cmd)
+enum drbd_peer_state conn_khelper(struct drbd_connection *connection, char *cmd)
{
char *envp[] = { "HOME=/",
"TERM=linux",
@@ -503,17 +503,17 @@ bool conn_try_outdate_peer(struct drbd_connection *connection)
r = conn_khelper(connection, "fence-peer");

switch ((r>>8) & 0xff) {
- case 3: /* peer is inconsistent */
+ case P_INCONSISTENT: /* peer is inconsistent */
ex_to_string = "peer is inconsistent or worse";
mask.pdsk = D_MASK;
val.pdsk = D_INCONSISTENT;
break;
- case 4: /* peer got outdated, or was already outdated */
+ case P_OUTDATED: /* peer got outdated, or was already outdated */
ex_to_string = "peer was fenced";
mask.pdsk = D_MASK;
val.pdsk = D_OUTDATED;
break;
- case 5: /* peer was down */
+ case P_DOWN: /* peer was down */
if (conn_highest_disk(connection) == D_UP_TO_DATE) {
/* we will(have) create(d) a new UUID anyways... */
ex_to_string = "peer is unreachable, assumed to be dead";
@@ -523,7 +523,7 @@ bool conn_try_outdate_peer(struct drbd_connection *connection)
ex_to_string = "peer unreachable, doing nothing since disk != UpToDate";
}
break;
- case 6: /* Peer is primary, voluntarily outdate myself.
+ case P_PRIMARY: /* Peer is primary, voluntarily outdate myself.
* This is useful when an unconnected R_SECONDARY is asked to
* become R_PRIMARY, but finds the other peer being active. */
ex_to_string = "peer is active";
@@ -531,7 +531,9 @@ bool conn_try_outdate_peer(struct drbd_connection *connection)
mask.disk = D_MASK;
val.disk = D_OUTDATED;
break;
- case 7:
+ case P_FENCING:
+ /* THINK: do we need to handle this
+ * like case 4, or more like case 5? */
if (fp != FP_STONITH)
drbd_err(connection, "fence-peer() = 7 && fencing != Stonith !!!\n");
ex_to_string = "peer was stonithed";
diff --git a/drivers/block/drbd/drbd_proc.c b/drivers/block/drbd/drbd_proc.c
index 6537b25..be2b93f 100644
--- a/drivers/block/drbd/drbd_proc.c
+++ b/drivers/block/drbd/drbd_proc.c
@@ -25,7 +25,7 @@

#include <linux/module.h>

-#include <asm/uaccess.h>
+#include <linux/uaccess.h>
#include <linux/fs.h>
#include <linux/file.h>
#include <linux/proc_fs.h>
@@ -122,18 +122,18 @@ static void drbd_syncer_progress(struct drbd_device *device, struct seq_file *se

x = res/50;
y = 20-x;
- seq_printf(seq, "\t[");
+ seq_puts(seq, "\t[");
for (i = 1; i < x; i++)
- seq_printf(seq, "=");
- seq_printf(seq, ">");
+ seq_putc(seq, '=');
+ seq_putc(seq, '>');
for (i = 0; i < y; i++)
seq_printf(seq, ".");
- seq_printf(seq, "] ");
+ seq_puts(seq, "] ");

if (state.conn == C_VERIFY_S || state.conn == C_VERIFY_T)
- seq_printf(seq, "verified:");
+ seq_puts(seq, "verified:");
else
- seq_printf(seq, "sync'ed:");
+ seq_puts(seq, "sync'ed:");
seq_printf(seq, "%3u.%u%% ", res / 10, res % 10);

/* if more than a few GB, display in MB */
@@ -146,7 +146,7 @@ static void drbd_syncer_progress(struct drbd_device *device, struct seq_file *se
(unsigned long) Bit2KB(rs_left),
(unsigned long) Bit2KB(rs_total));

- seq_printf(seq, "\n\t");
+ seq_puts(seq, "\n\t");

/* see drivers/md/md.c
* We do not want to overflow, so the order of operands and
@@ -175,9 +175,9 @@ static void drbd_syncer_progress(struct drbd_device *device, struct seq_file *se
rt / 3600, (rt % 3600) / 60, rt % 60);

dbdt = Bit2KB(db/dt);
- seq_printf(seq, " speed: ");
+ seq_puts(seq, " speed: ");
seq_printf_with_thousands_grouping(seq, dbdt);
- seq_printf(seq, " (");
+ seq_puts(seq, " (");
/* ------------------------- ~3s average ------------------------ */
if (proc_details >= 1) {
/* this is what drbd_rs_should_slow_down() uses */
@@ -188,7 +188,7 @@ static void drbd_syncer_progress(struct drbd_device *device, struct seq_file *se
db = device->rs_mark_left[i] - rs_left;
dbdt = Bit2KB(db/dt);
seq_printf_with_thousands_grouping(seq, dbdt);
- seq_printf(seq, " -- ");
+ seq_puts(seq, " -- ");
}

/* --------------------- long term average ---------------------- */
@@ -200,11 +200,11 @@ static void drbd_syncer_progress(struct drbd_device *device, struct seq_file *se
db = rs_total - rs_left;
dbdt = Bit2KB(db/dt);
seq_printf_with_thousands_grouping(seq, dbdt);
- seq_printf(seq, ")");
+ seq_putc(seq, ')');

if (state.conn == C_SYNC_TARGET ||
state.conn == C_VERIFY_S) {
- seq_printf(seq, " want: ");
+ seq_puts(seq, " want: ");
seq_printf_with_thousands_grouping(seq, device->c_sync_rate);
}
seq_printf(seq, " K/sec%s\n", stalled ? " (stalled)" : "");
@@ -231,7 +231,7 @@ static void drbd_syncer_progress(struct drbd_device *device, struct seq_file *se
(unsigned long long)bm_bits * BM_SECT_PER_BIT);
if (stop_sector != 0 && stop_sector != ULLONG_MAX)
seq_printf(seq, " stop sector: %llu", stop_sector);
- seq_printf(seq, "\n");
+ seq_putc(seq, '\n');
}
}

@@ -276,7 +276,7 @@ static int drbd_seq_show(struct seq_file *seq, void *v)
rcu_read_lock();
idr_for_each_entry(&drbd_devices, device, i) {
if (prev_i != i - 1)
- seq_printf(seq, "\n");
+ seq_putc(seq, '\n');
prev_i = i;

state = device->state;
diff --git a/drivers/block/drbd/drbd_receiver.c b/drivers/block/drbd/drbd_receiver.c
index 8e7afa3..5c06286 100644
--- a/drivers/block/drbd/drbd_receiver.c
+++ b/drivers/block/drbd/drbd_receiver.c
@@ -25,7 +25,7 @@

#include <linux/module.h>

-#include <asm/uaccess.h>
+#include <linux/uaccess.h>
#include <net/sock.h>

#include <linux/drbd.h>
@@ -2286,13 +2286,13 @@ static inline int overlaps(sector_t s1, int l1, sector_t s2, int l2)
static bool overlapping_resync_write(struct drbd_device *device, struct drbd_peer_request *peer_req)
{
struct drbd_peer_request *rs_req;
- bool rv = 0;
+ bool rv = false;

spin_lock_irq(&device->resource->req_lock);
list_for_each_entry(rs_req, &device->sync_ee, w.list) {
if (overlaps(peer_req->i.sector, peer_req->i.size,
rs_req->i.sector, rs_req->i.size)) {
- rv = 1;
+ rv = true;
break;
}
}
@@ -2666,7 +2666,7 @@ static int receive_Data(struct drbd_connection *connection, struct packet_info *
}

out_interrupted:
- drbd_may_finish_epoch(connection, peer_req->epoch, EV_PUT + EV_CLEANUP);
+ drbd_may_finish_epoch(connection, peer_req->epoch, EV_PUT | EV_CLEANUP);
put_ldev(device);
drbd_free_peer_req(device, peer_req);
return err;
diff --git a/drivers/block/drbd/drbd_req.c b/drivers/block/drbd/drbd_req.c
index 72bb1b1..784b02a 100644
--- a/drivers/block/drbd/drbd_req.c
+++ b/drivers/block/drbd/drbd_req.c
@@ -1000,7 +1000,7 @@ static void complete_conflicting_writes(struct drbd_request *req)
finish_wait(&device->misc_wait, &wait);
}

-/* called within req_lock and rcu_read_lock() */
+/* called within req_lock */
static void maybe_pull_ahead(struct drbd_device *device)
{
struct drbd_connection *connection = first_peer_device(device)->connection;
diff --git a/drivers/block/drbd/drbd_state.c b/drivers/block/drbd/drbd_state.c
index a1b5e6c9..aca68a5 100644
--- a/drivers/block/drbd/drbd_state.c
+++ b/drivers/block/drbd/drbd_state.c
@@ -2196,9 +2196,7 @@ conn_set_state(struct drbd_connection *connection, union drbd_state mask, union
ns.disk = os.disk;

rv = _drbd_set_state(device, ns, flags, NULL);
- if (rv < SS_SUCCESS)
- BUG();
-
+ BUG_ON(rv < SS_SUCCESS);
ns.i = device->state.i;
ns_max.role = max_role(ns.role, ns_max.role);
ns_max.peer = max_role(ns.peer, ns_max.peer);
diff --git a/drivers/block/drbd/drbd_state.h b/drivers/block/drbd/drbd_state.h
index bd98953..6c9d5d4 100644
--- a/drivers/block/drbd/drbd_state.h
+++ b/drivers/block/drbd/drbd_state.h
@@ -140,7 +140,7 @@ extern void drbd_resume_al(struct drbd_device *device);
extern bool conn_all_vols_unconf(struct drbd_connection *connection);

/**
- * drbd_request_state() - Reqest a state change
+ * drbd_request_state() - Request a state change
* @device: DRBD device.
* @mask: mask of state bits to change.
* @val: value of new state bits.
diff --git a/drivers/block/drbd/drbd_strings.c b/drivers/block/drbd/drbd_strings.c
index 80b0f63..0eeab14 100644
--- a/drivers/block/drbd/drbd_strings.c
+++ b/drivers/block/drbd/drbd_strings.c
@@ -26,7 +26,7 @@
#include <linux/drbd.h>
#include "drbd_strings.h"

-static const char *drbd_conn_s_names[] = {
+static const char * const drbd_conn_s_names[] = {
[C_STANDALONE] = "StandAlone",
[C_DISCONNECTING] = "Disconnecting",
[C_UNCONNECTED] = "Unconnected",
@@ -53,13 +53,13 @@ static const char *drbd_conn_s_names[] = {
[C_BEHIND] = "Behind",
};

-static const char *drbd_role_s_names[] = {
+static const char * const drbd_role_s_names[] = {
[R_PRIMARY] = "Primary",
[R_SECONDARY] = "Secondary",
[R_UNKNOWN] = "Unknown"
};

-static const char *drbd_disk_s_names[] = {
+static const char * const drbd_disk_s_names[] = {
[D_DISKLESS] = "Diskless",
[D_ATTACHING] = "Attaching",
[D_FAILED] = "Failed",
@@ -71,7 +71,7 @@ static const char *drbd_disk_s_names[] = {
[D_UP_TO_DATE] = "UpToDate",
};

-static const char *drbd_state_sw_errors[] = {
+static const char * const drbd_state_sw_errors[] = {
[-SS_TWO_PRIMARIES] = "Multiple primaries not allowed by config",
[-SS_NO_UP_TO_DATE_DISK] = "Need access to UpToDate data",
[-SS_NO_LOCAL_DISK] = "Can not resync without local disk",
diff --git a/drivers/block/drbd/drbd_worker.c b/drivers/block/drbd/drbd_worker.c
index ed422a5..9f3c550 100644
--- a/drivers/block/drbd/drbd_worker.c
+++ b/drivers/block/drbd/drbd_worker.c
@@ -173,8 +173,8 @@ void drbd_peer_request_endio(struct bio *bio)
{
struct drbd_peer_request *peer_req = bio->bi_private;
struct drbd_device *device = peer_req->peer_device->device;
- int is_write = bio_data_dir(bio) == WRITE;
- int is_discard = !!(bio->bi_rw & REQ_DISCARD);
+ bool is_write = bio_data_dir(bio) == WRITE;
+ bool is_discard = !!(bio->bi_rw & REQ_DISCARD);

if (bio->bi_error && __ratelimit(&drbd_ratelimit_state))
drbd_warn(device, "%s: error=%d s=%llus\n",
@@ -1038,7 +1038,6 @@ static void move_to_net_ee_or_free(struct drbd_device *device, struct drbd_peer_

/**
* w_e_end_data_req() - Worker callback, to send a P_DATA_REPLY packet in response to a P_DATA_REQUEST
- * @device: DRBD device.
* @w: work object.
* @cancel: The connection will be closed anyways
*/
@@ -1699,7 +1698,7 @@ static bool use_checksum_based_resync(struct drbd_connection *connection, struct
rcu_read_unlock();
return connection->agreed_pro_version >= 89 && /* supported? */
connection->csums_tfm && /* configured? */
- (csums_after_crash_only == 0 /* use for each resync? */
+ (csums_after_crash_only == false /* use for each resync? */
|| test_bit(CRASHED_PRIMARY, &device->flags)); /* or only after Primary crash? */
}

@@ -1834,7 +1833,7 @@ void drbd_start_resync(struct drbd_device *device, enum drbd_conns side)
device->bm_resync_fo = 0;
device->use_csums = use_checksum_based_resync(connection, device);
} else {
- device->use_csums = 0;
+ device->use_csums = false;
}

/* Since protocol 96, we must serialize drbd_gen_and_send_sync_uuid
diff --git a/include/linux/drbd.h b/include/linux/drbd.h
index d6b3c99..2b26156 100644
--- a/include/linux/drbd.h
+++ b/include/linux/drbd.h
@@ -370,6 +370,14 @@ enum drbd_notification_type {
NOTIFY_FLAGS = NOTIFY_CONTINUES,
};

+enum drbd_peer_state {
+ P_INCONSISTENT = 3,
+ P_OUTDATED = 4,
+ P_DOWN = 5,
+ P_PRIMARY = 6,
+ P_FENCING = 7,
+};
+
#define UUID_JUST_CREATED ((__u64)4)

enum write_ordering_e {
--
1.9.1