Merging upstream version 6.7.7.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 32 insertions, 32 deletions

diff --git a/drivers/md/raid5-cache.c b/drivers/md/raid5-cache.c
index 518b7cfa78..6157f5beb9 100644
--- a/drivers/md/raid5-cache.c
+++ b/drivers/md/raid5-cache.c
@@ -327,8 +327,9 @@ void r5l_wake_reclaim(struct r5l_log *log, sector_t space);
 void r5c_check_stripe_cache_usage(struct r5conf *conf)
 {
 	int total_cached;
+	struct r5l_log *log = READ_ONCE(conf->log);
 
-	if (!r5c_is_writeback(conf->log))
+	if (!r5c_is_writeback(log))
 		return;
 
 	total_cached = atomic_read(&conf->r5c_cached_partial_stripes) +
@@ -344,7 +345,7 @@ void r5c_check_stripe_cache_usage(struct r5conf *conf)
 	 */
 	if (total_cached > conf->min_nr_stripes * 1 / 2 ||
 	    atomic_read(&conf->empty_inactive_list_nr) > 0)
-		r5l_wake_reclaim(conf->log, 0);
+		r5l_wake_reclaim(log, 0);
 }
 
 /*
@@ -353,7 +354,9 @@ void r5c_check_stripe_cache_usage(struct r5conf *conf)
  */
 void r5c_check_cached_full_stripe(struct r5conf *conf)
 {
-	if (!r5c_is_writeback(conf->log))
+	struct r5l_log *log = READ_ONCE(conf->log);
+
+	if (!r5c_is_writeback(log))
 		return;
 
 	/*
@@ -363,7 +366,7 @@ void r5c_check_cached_full_stripe(struct r5conf *conf)
 	if (atomic_read(&conf->r5c_cached_full_stripes) >=
 	    min(R5C_FULL_STRIPE_FLUSH_BATCH(conf),
 		conf->chunk_sectors >> RAID5_STRIPE_SHIFT(conf)))
-		r5l_wake_reclaim(conf->log, 0);
+		r5l_wake_reclaim(log, 0);
 }
 
 /*
@@ -396,7 +399,7 @@ void r5c_check_cached_full_stripe(struct r5conf *conf)
  */
 static sector_t r5c_log_required_to_flush_cache(struct r5conf *conf)
 {
-	struct r5l_log *log = conf->log;
+	struct r5l_log *log = READ_ONCE(conf->log);
 
 	if (!r5c_is_writeback(log))
 		return 0;
@@ -449,7 +452,7 @@ static inline void r5c_update_log_state(struct r5l_log *log)
 void r5c_make_stripe_write_out(struct stripe_head *sh)
 {
 	struct r5conf *conf = sh->raid_conf;
-	struct r5l_log *log = conf->log;
+	struct r5l_log *log = READ_ONCE(conf->log);
 
 	BUG_ON(!r5c_is_writeback(log));
 
@@ -491,7 +494,7 @@ static void r5c_handle_parity_cached(struct stripe_head *sh)
  */
 static void r5c_finish_cache_stripe(struct stripe_head *sh)
 {
-	struct r5l_log *log = sh->raid_conf->log;
+	struct r5l_log *log = READ_ONCE(sh->raid_conf->log);
 
 	if (log->r5c_journal_mode == R5C_JOURNAL_MODE_WRITE_THROUGH) {
 		BUG_ON(test_bit(STRIPE_R5C_CACHING, &sh->state));
@@ -683,7 +686,6 @@ static void r5c_disable_writeback_async(struct work_struct *work)
 					   disable_writeback_work);
 	struct mddev *mddev = log->rdev->mddev;
 	struct r5conf *conf = mddev->private;
-	int locked = 0;
 
 	if (log->r5c_journal_mode == R5C_JOURNAL_MODE_WRITE_THROUGH)
 		return;
@@ -692,14 +694,14 @@ static void r5c_disable_writeback_async(struct work_struct *work)
 
 	/* wait superblock change before suspend */
 	wait_event(mddev->sb_wait,
-		   conf->log == NULL ||
-		   (!test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags) &&
-		    (locked = mddev_trylock(mddev))));
-	if (locked) {
-		mddev_suspend(mddev);
+		   !READ_ONCE(conf->log) ||
+		   !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags));
+
+	log = READ_ONCE(conf->log);
+	if (log) {
+		mddev_suspend(mddev, false);
 		log->r5c_journal_mode = R5C_JOURNAL_MODE_WRITE_THROUGH;
 		mddev_resume(mddev);
-		mddev_unlock(mddev);
 	}
 }
 
@@ -1151,7 +1153,7 @@ static void r5l_run_no_space_stripes(struct r5l_log *log)
 static sector_t r5c_calculate_new_cp(struct r5conf *conf)
 {
 	struct stripe_head *sh;
-	struct r5l_log *log = conf->log;
+	struct r5l_log *log = READ_ONCE(conf->log);
 	sector_t new_cp;
 	unsigned long flags;
 
@@ -1159,12 +1161,12 @@ static sector_t r5c_calculate_new_cp(struct r5conf *conf)
 		return log->next_checkpoint;
 
 	spin_lock_irqsave(&log->stripe_in_journal_lock, flags);
-	if (list_empty(&conf->log->stripe_in_journal_list)) {
+	if (list_empty(&log->stripe_in_journal_list)) {
 		/* all stripes flushed */
 		spin_unlock_irqrestore(&log->stripe_in_journal_lock, flags);
 		return log->next_checkpoint;
 	}
-	sh = list_first_entry(&conf->log->stripe_in_journal_list,
+	sh = list_first_entry(&log->stripe_in_journal_list,
 			      struct stripe_head, r5c);
 	new_cp = sh->log_start;
 	spin_unlock_irqrestore(&log->stripe_in_journal_lock, flags);
@@ -1399,7 +1401,7 @@ void r5c_flush_cache(struct r5conf *conf, int num)
 	struct stripe_head *sh, *next;
 
 	lockdep_assert_held(&conf->device_lock);
-	if (!conf->log)
+	if (!READ_ONCE(conf->log))
 		return;
 
 	count = 0;
@@ -1420,7 +1422,7 @@ void r5c_flush_cache(struct r5conf *conf, int num)
 
 static void r5c_do_reclaim(struct r5conf *conf)
 {
-	struct r5l_log *log = conf->log;
+	struct r5l_log *log = READ_ONCE(conf->log);
 	struct stripe_head *sh;
 	int count = 0;
 	unsigned long flags;
@@ -1549,7 +1551,7 @@ static void r5l_reclaim_thread(struct md_thread *thread)
 {
 	struct mddev *mddev = thread->mddev;
 	struct r5conf *conf = mddev->private;
-	struct r5l_log *log = conf->log;
+	struct r5l_log *log = READ_ONCE(conf->log);
 
 	if (!log)
 		return;
@@ -1591,7 +1593,7 @@ void r5l_quiesce(struct r5l_log *log, int quiesce)
 
 bool r5l_log_disk_error(struct r5conf *conf)
 {
-	struct r5l_log *log = conf->log;
+	struct r5l_log *log = READ_ONCE(conf->log);
 
 	/* don't allow write if journal disk is missing */
 	if (!log)
@@ -2583,9 +2585,7 @@ int r5c_journal_mode_set(struct mddev *mddev, int mode)
 	    mode == R5C_JOURNAL_MODE_WRITE_BACK)
 		return -EINVAL;
 
-	mddev_suspend(mddev);
 	conf->log->r5c_journal_mode = mode;
-	mddev_resume(mddev);
 
 	pr_debug("md/raid:%s: setting r5c cache mode to %d: %s\n",
 		 mdname(mddev), mode, r5c_journal_mode_str[mode]);
@@ -2610,11 +2610,11 @@ static ssize_t r5c_journal_mode_store(struct mddev *mddev,
 		if (strlen(r5c_journal_mode_str[mode]) == len &&
 		    !strncmp(page, r5c_journal_mode_str[mode], len))
 			break;
-	ret = mddev_lock(mddev);
+	ret = mddev_suspend_and_lock(mddev);
 	if (ret)
 		return ret;
 	ret = r5c_journal_mode_set(mddev, mode);
-	mddev_unlock(mddev);
+	mddev_unlock_and_resume(mddev);
 	return ret ?: length;
 }
 
@@ -2635,7 +2635,7 @@ int r5c_try_caching_write(struct r5conf *conf,
 			  struct stripe_head_state *s,
 			  int disks)
 {
-	struct r5l_log *log = conf->log;
+	struct r5l_log *log = READ_ONCE(conf->log);
 	int i;
 	struct r5dev *dev;
 	int to_cache = 0;
@@ -2802,7 +2802,7 @@ void r5c_finish_stripe_write_out(struct r5conf *conf,
 				 struct stripe_head *sh,
 				 struct stripe_head_state *s)
 {
-	struct r5l_log *log = conf->log;
+	struct r5l_log *log = READ_ONCE(conf->log);
 	int i;
 	int do_wakeup = 0;
 	sector_t tree_index;
@@ -2941,7 +2941,7 @@ int r5c_cache_data(struct r5l_log *log, struct stripe_head *sh)
 /* check whether this big stripe is in write back cache. */
 bool r5c_big_stripe_cached(struct r5conf *conf, sector_t sect)
 {
-	struct r5l_log *log = conf->log;
+	struct r5l_log *log = READ_ONCE(conf->log);
 	sector_t tree_index;
 	void *slot;
 
@@ -3049,14 +3049,14 @@ int r5l_start(struct r5l_log *log)
 void r5c_update_on_rdev_error(struct mddev *mddev, struct md_rdev *rdev)
 {
 	struct r5conf *conf = mddev->private;
-	struct r5l_log *log = conf->log;
+	struct r5l_log *log = READ_ONCE(conf->log);
 
 	if (!log)
 		return;
 
 	if ((raid5_calc_degraded(conf) > 0 ||
 	     test_bit(Journal, &rdev->flags)) &&
-	    conf->log->r5c_journal_mode == R5C_JOURNAL_MODE_WRITE_BACK)
+	    log->r5c_journal_mode == R5C_JOURNAL_MODE_WRITE_BACK)
 		schedule_work(&log->disable_writeback_work);
 }
 
@@ -3145,7 +3145,7 @@ int r5l_init_log(struct r5conf *conf, struct md_rdev *rdev)
 	spin_lock_init(&log->stripe_in_journal_lock);
 	atomic_set(&log->stripe_in_journal_count, 0);
 
-	conf->log = log;
+	WRITE_ONCE(conf->log, log);
 
 	set_bit(MD_HAS_JOURNAL, &conf->mddev->flags);
 	return 0;
@@ -3173,7 +3173,7 @@ void r5l_exit_log(struct r5conf *conf)
 	 * 'reconfig_mutex' is held by caller, set 'confg->log' to NULL to
 	 * ensure disable_writeback_work wakes up and exits.
 	 */
-	conf->log = NULL;
+	WRITE_ONCE(conf->log, NULL);
 	wake_up(&conf->mddev->sb_wait);
 	flush_work(&log->disable_writeback_work);