md: use stripe_head_state in ops_run_io()

From: Dan Williams <dan.j.williams@intel.com>

In handle_stripe after taking sh->lock we sample some bits into 's' (struct
stripe_head_state):

	s.syncing = test_bit(STRIPE_SYNCING, &sh->state);
	s.expanding = test_bit(STRIPE_EXPAND_SOURCE, &sh->state);
	s.expanded = test_bit(STRIPE_EXPAND_READY, &sh->state);

Use these values from 's' in ops_run_io() rather than re-sampling the bits.
This ensures a consistent snapshot (as seen under sh->lock) is used.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Neil Brown <neilb@suse.de>

diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index cac9708..c4ef307 100644 (file)
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -390,7 +390,7 @@ raid5_end_read_request(struct bio *bi, int error);
 static void
 raid5_end_write_request(struct bio *bi, int error);
 
-static void ops_run_io(struct stripe_head *sh)
+static void ops_run_io(struct stripe_head *sh, struct stripe_head_state *s)
 {
        raid5_conf_t *conf = sh->raid_conf;
        int i, disks = sh->disks;
@@ -425,9 +425,7 @@ static void ops_run_io(struct stripe_head *sh)
                rcu_read_unlock();
 
                if (rdev) {
-                       if (test_bit(STRIPE_SYNCING, &sh->state) ||
-                               test_bit(STRIPE_EXPAND_SOURCE, &sh->state) ||
-                               test_bit(STRIPE_EXPAND_READY, &sh->state))
+                       if (s->syncing || s->expanding || s->expanded)
                                md_sync_acct(rdev->bdev, STRIPE_SECTORS);
 
                        set_bit(STRIPE_IO_STARTED, &sh->state);
@@ -2902,10 +2900,9 @@ static void handle_stripe5(struct stripe_head *sh)
        if (pending)
                raid5_run_ops(sh, pending);
 
-       ops_run_io(sh);
+       ops_run_io(sh, &s);
 
        return_io(return_bi);
-
 }
 
 static void handle_stripe6(struct stripe_head *sh, struct page *tmp_page)