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Subject[PATCH 04/15] drbd: Split drbd_alter_sa() into drbd_sync_after_valid() and drbd_sync_after_changed()
Date
Preparing RCU for disk_conf

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
---
drivers/block/drbd/drbd_int.h | 3 ++-
drivers/block/drbd/drbd_nl.c | 15 +++++++--------
drivers/block/drbd/drbd_worker.c | 22 ++++++++--------------
3 files changed, 17 insertions(+), 23 deletions(-)
diff --git a/drivers/block/drbd/drbd_int.h b/drivers/block/drbd/drbd_int.h
index 8c7e340..f8d0ac3 100644
--- a/drivers/block/drbd/drbd_int.h
+++ b/drivers/block/drbd/drbd_int.h
@@ -1409,7 +1409,8 @@ extern int drbd_khelper(struct drbd_conf *mdev, char *cmd);

/* drbd_worker.c */
extern int drbd_worker(struct drbd_thread *thi);
-extern int drbd_alter_sa(struct drbd_conf *mdev, int na);
+enum drbd_ret_code drbd_sync_after_valid(struct drbd_conf *mdev, int o_minor);
+void drbd_sync_after_changed(struct drbd_conf *mdev);
extern void drbd_start_resync(struct drbd_conf *mdev, enum drbd_conns side);
extern void resume_next_sg(struct drbd_conf *mdev);
extern void suspend_other_sg(struct drbd_conf *mdev);
diff --git a/drivers/block/drbd/drbd_nl.c b/drivers/block/drbd/drbd_nl.c
index dfe43f2..4efeffa 100644
--- a/drivers/block/drbd/drbd_nl.c
+++ b/drivers/block/drbd/drbd_nl.c
@@ -1181,13 +1181,6 @@ int drbd_adm_disk_opts(struct sk_buff *skb, struct genl_info *info)
if (!expect(new_disk_conf->al_extents <= DRBD_AL_EXTENTS_MAX))
new_disk_conf->al_extents = DRBD_AL_EXTENTS_MAX;

- /* most sanity checks done, try to assign the new sync-after
- * dependency. need to hold the global lock in there,
- * to avoid a race in the dependency loop check. */
- retcode = drbd_alter_sa(mdev, new_disk_conf->resync_after);
- if (retcode != NO_ERROR)
- goto fail;
-
fifo_size = (new_disk_conf->c_plan_ahead * 10 * SLEEP_TIME) / HZ;
if (fifo_size != mdev->rs_plan_s.size && fifo_size > 0) {
rs_plan_s = kzalloc(sizeof(int) * fifo_size, GFP_KERNEL);
@@ -1221,7 +1214,13 @@ int drbd_adm_disk_opts(struct sk_buff *skb, struct genl_info *info)
* To avoid someone looking at a half-updated struct, we probably
* should have a rw-semaphor on net_conf and disk_conf.
*/
- mdev->ldev->dc = *new_disk_conf;
+ write_lock_irq(&global_state_lock);
+ retcode = drbd_sync_after_valid(mdev, new_disk_conf->resync_after);
+ if (retcode == NO_ERROR) {
+ mdev->ldev->dc = *new_disk_conf;
+ drbd_sync_after_changed(mdev);
+ }
+ write_unlock_irq(&global_state_lock);

drbd_md_sync(mdev);

diff --git a/drivers/block/drbd/drbd_worker.c b/drivers/block/drbd/drbd_worker.c
index f22288b1..f8fdf75 100644
--- a/drivers/block/drbd/drbd_worker.c
+++ b/drivers/block/drbd/drbd_worker.c
@@ -1401,7 +1401,8 @@ void suspend_other_sg(struct drbd_conf *mdev)
write_unlock_irq(&global_state_lock);
}

-static int sync_after_error(struct drbd_conf *mdev, int o_minor)
+/* caller must hold global_state_lock */
+enum drbd_ret_code drbd_sync_after_valid(struct drbd_conf *mdev, int o_minor)
{
struct drbd_conf *odev;

@@ -1425,22 +1426,15 @@ static int sync_after_error(struct drbd_conf *mdev, int o_minor)
}
}

-int drbd_alter_sa(struct drbd_conf *mdev, int na)
+/* caller must hold global_state_lock */
+void drbd_sync_after_changed(struct drbd_conf *mdev)
{
int changes;
- int retcode;

- write_lock_irq(&global_state_lock);
- retcode = sync_after_error(mdev, na);
- if (retcode == NO_ERROR) {
- mdev->ldev->dc.resync_after = na;
- do {
- changes = _drbd_pause_after(mdev);
- changes |= _drbd_resume_next(mdev);
- } while (changes);
- }
- write_unlock_irq(&global_state_lock);
- return retcode;
+ do {
+ changes = _drbd_pause_after(mdev);
+ changes |= _drbd_resume_next(mdev);
+ } while (changes);
}

void drbd_rs_controller_reset(struct drbd_conf *mdev)
--
1.7.4.1


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