md/raid5: separate large if clause out of fetch_block().
fetch_block() has a very large and hard to read 'if' condition.
Separate it into its own function so that it can be
made more readable.
Signed-off-by: NeilBrown <neilb@suse.de>
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 274db18..5a980fe 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -2895,14 +2895,14 @@
* Returns 1 when no more member devices need to be checked, otherwise returns
* 0 to tell the loop in handle_stripe_fill to continue
*/
-static int fetch_block(struct stripe_head *sh, struct stripe_head_state *s,
- int disk_idx, int disks)
+
+static int need_this_block(struct stripe_head *sh, struct stripe_head_state *s,
+ int disk_idx, int disks)
{
struct r5dev *dev = &sh->dev[disk_idx];
struct r5dev *fdev[2] = { &sh->dev[s->failed_num[0]],
&sh->dev[s->failed_num[1]] };
- /* is the data in this block needed, and can we get it? */
if (!test_bit(R5_LOCKED, &dev->flags) &&
!test_bit(R5_UPTODATE, &dev->flags) &&
(dev->toread ||
@@ -2919,7 +2919,18 @@
&& s->failed && s->to_write &&
(s->to_write - s->non_overwrite <
sh->raid_conf->raid_disks - sh->raid_conf->max_degraded) &&
- (!test_bit(R5_Insync, &dev->flags) || test_bit(STRIPE_PREREAD_ACTIVE, &sh->state))))) {
+ (!test_bit(R5_Insync, &dev->flags) || test_bit(STRIPE_PREREAD_ACTIVE, &sh->state)))))
+ return 1;
+ return 0;
+}
+
+static int fetch_block(struct stripe_head *sh, struct stripe_head_state *s,
+ int disk_idx, int disks)
+{
+ struct r5dev *dev = &sh->dev[disk_idx];
+
+ /* is the data in this block needed, and can we get it? */
+ if (need_this_block(sh, s, disk_idx, disks)) {
/* we would like to get this block, possibly by computing it,
* otherwise read it if the backing disk is insync
*/