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Subject[PATCH 17/18] drbd: use drbd_device_post_work() in more places
Date
From: Lars Ellenberg <lars.ellenberg@linbit.com>

This replaces the md_sync_work member of struct drbd_device
by a new MD_SYNC "work bit" in device->flags.

This replaces the resync_start_work member of struct drbd_device
by a new RS_START "work bit" in device->flags.

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
---
drivers/block/drbd/drbd_int.h | 16 ++--------------
drivers/block/drbd/drbd_main.c | 25 +------------------------
drivers/block/drbd/drbd_worker.c | 27 +++++++++++++++++----------
3 files changed, 20 insertions(+), 48 deletions(-)

diff --git a/drivers/block/drbd/drbd_int.h b/drivers/block/drbd/drbd_int.h
index 5768260..3c701b0 100644
--- a/drivers/block/drbd/drbd_int.h
+++ b/drivers/block/drbd/drbd_int.h
@@ -457,6 +457,8 @@ enum {
/* to be used in drbd_device_post_work() */
GO_DISKLESS, /* tell worker to schedule cleanup before detach */
DESTROY_DISK, /* tell worker to close backing devices and destroy related structures. */
+ MD_SYNC, /* tell worker to call drbd_md_sync() */
+ RS_START, /* tell worker to start resync/OV */
RS_PROGRESS, /* tell worker that resync made significant progress */
RS_DONE, /* tell worker that resync is done */
};
@@ -709,18 +711,10 @@ struct drbd_device {
unsigned long last_reattach_jif;
struct drbd_work resync_work;
struct drbd_work unplug_work;
- struct drbd_work md_sync_work;
- struct drbd_work start_resync_work;
struct timer_list resync_timer;
struct timer_list md_sync_timer;
struct timer_list start_resync_timer;
struct timer_list request_timer;
-#ifdef DRBD_DEBUG_MD_SYNC
- struct {
- unsigned int line;
- const char* func;
- } last_md_mark_dirty;
-#endif

/* Used after attach while negotiating new disk state. */
union drbd_state new_state_tmp;
@@ -977,13 +971,7 @@ extern void __drbd_uuid_set(struct drbd_device *device, int idx, u64 val) __must
extern void drbd_md_set_flag(struct drbd_device *device, int flags) __must_hold(local);
extern void drbd_md_clear_flag(struct drbd_device *device, int flags)__must_hold(local);
extern int drbd_md_test_flag(struct drbd_backing_dev *, int);
-#ifndef DRBD_DEBUG_MD_SYNC
extern void drbd_md_mark_dirty(struct drbd_device *device);
-#else
-#define drbd_md_mark_dirty(m) drbd_md_mark_dirty_(m, __LINE__ , __func__ )
-extern void drbd_md_mark_dirty_(struct drbd_device *device,
- unsigned int line, const char *func);
-#endif
extern void drbd_queue_bitmap_io(struct drbd_device *device,
int (*io_fn)(struct drbd_device *),
void (*done)(struct drbd_device *, int),
diff --git a/drivers/block/drbd/drbd_main.c b/drivers/block/drbd/drbd_main.c
index 0cf6094..ed35d52 100644
--- a/drivers/block/drbd/drbd_main.c
+++ b/drivers/block/drbd/drbd_main.c
@@ -60,7 +60,6 @@
static DEFINE_MUTEX(drbd_main_mutex);
static int drbd_open(struct block_device *bdev, fmode_t mode);
static void drbd_release(struct gendisk *gd, fmode_t mode);
-static int w_md_sync(struct drbd_work *w, int unused);
static void md_sync_timer_fn(unsigned long data);
static int w_bitmap_io(struct drbd_work *w, int unused);

@@ -1928,15 +1927,11 @@ void drbd_init_set_defaults(struct drbd_device *device)
INIT_LIST_HEAD(&device->resync_reads);
INIT_LIST_HEAD(&device->resync_work.list);
INIT_LIST_HEAD(&device->unplug_work.list);
- INIT_LIST_HEAD(&device->md_sync_work.list);
- INIT_LIST_HEAD(&device->start_resync_work.list);
INIT_LIST_HEAD(&device->bm_io_work.w.list);

device->resync_work.cb = w_resync_timer;
device->unplug_work.cb = w_send_write_hint;
- device->md_sync_work.cb = w_md_sync;
device->bm_io_work.w.cb = w_bitmap_io;
- device->start_resync_work.cb = w_start_resync;

init_timer(&device->resync_timer);
init_timer(&device->md_sync_timer);
@@ -3623,25 +3618,7 @@ int drbd_md_test_flag(struct drbd_backing_dev *bdev, int flag)
static void md_sync_timer_fn(unsigned long data)
{
struct drbd_device *device = (struct drbd_device *) data;
-
- /* must not double-queue! */
- if (list_empty(&device->md_sync_work.list))
- drbd_queue_work_front(&first_peer_device(device)->connection->sender_work,
- &device->md_sync_work);
-}
-
-static int w_md_sync(struct drbd_work *w, int unused)
-{
- struct drbd_device *device =
- container_of(w, struct drbd_device, md_sync_work);
-
- drbd_warn(device, "md_sync_timer expired! Worker calls drbd_md_sync().\n");
-#ifdef DEBUG
- drbd_warn(device, "last md_mark_dirty: %s:%u\n",
- device->last_md_mark_dirty.func, device->last_md_mark_dirty.line);
-#endif
- drbd_md_sync(device);
- return 0;
+ drbd_device_post_work(device, MD_SYNC);
}

const char *cmdname(enum drbd_packet cmd)
diff --git a/drivers/block/drbd/drbd_worker.c b/drivers/block/drbd/drbd_worker.c
index 00bf490..a4310fd 100644
--- a/drivers/block/drbd/drbd_worker.c
+++ b/drivers/block/drbd/drbd_worker.c
@@ -1606,26 +1606,20 @@ void drbd_rs_controller_reset(struct drbd_device *device)
void start_resync_timer_fn(unsigned long data)
{
struct drbd_device *device = (struct drbd_device *) data;
-
- drbd_queue_work(&first_peer_device(device)->connection->sender_work,
- &device->start_resync_work);
+ drbd_device_post_work(device, RS_START);
}

-int w_start_resync(struct drbd_work *w, int cancel)
+static void do_start_resync(struct drbd_device *device)
{
- struct drbd_device *device =
- container_of(w, struct drbd_device, start_resync_work);
-
if (atomic_read(&device->unacked_cnt) || atomic_read(&device->rs_pending_cnt)) {
- drbd_warn(device, "w_start_resync later...\n");
+ drbd_warn(device, "postponing start_resync ...\n");
device->start_resync_timer.expires = jiffies + HZ/10;
add_timer(&device->start_resync_timer);
- return 0;
+ return;
}

drbd_start_resync(device, C_SYNC_SOURCE);
clear_bit(AHEAD_TO_SYNC_SOURCE, &device->flags);
- return 0;
}

/**
@@ -1882,9 +1876,18 @@ static void go_diskless(struct drbd_device *device)
drbd_force_state(device, NS(disk, D_DISKLESS));
}

+static int do_md_sync(struct drbd_device *device)
+{
+ drbd_warn(device, "md_sync_timer expired! Worker calls drbd_md_sync().\n");
+ drbd_md_sync(device);
+ return 0;
+}
+
#define WORK_PENDING(work_bit, todo) (todo & (1UL << work_bit))
static void do_device_work(struct drbd_device *device, const unsigned long todo)
{
+ if (WORK_PENDING(MD_SYNC, todo))
+ do_md_sync(device);
if (WORK_PENDING(RS_DONE, todo) ||
WORK_PENDING(RS_PROGRESS, todo))
update_on_disk_bitmap(device, WORK_PENDING(RS_DONE, todo));
@@ -1892,11 +1895,15 @@ static void do_device_work(struct drbd_device *device, const unsigned long todo)
go_diskless(device);
if (WORK_PENDING(DESTROY_DISK, todo))
drbd_ldev_destroy(device);
+ if (WORK_PENDING(RS_START, todo))
+ do_start_resync(device);
}

#define DRBD_DEVICE_WORK_MASK \
((1UL << GO_DISKLESS) \
|(1UL << DESTROY_DISK) \
+ |(1UL << MD_SYNC) \
+ |(1UL << RS_START) \
|(1UL << RS_PROGRESS) \
|(1UL << RS_DONE) \
)
--
1.9.1


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