md/raid10: factor out common bio handling code

When normal-write and sync-read/write bio completes, we should
find out the disk number the bio belongs to. Factor those common
code out to a separate function.

Signed-off-by: Namhyung Kim <namhyung@gmail.com>
Signed-off-by: NeilBrown <neilb@suse.de>

1 files changed, 23 insertions, 21 deletions

diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index d55ae12b2d8c..e434f1e8d223 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -244,6 +244,23 @@ static inline void update_head_pos(int slot, r10bio_t *r10_bio)
                 r10_bio->devs[slot].addr + (r10_bio->sectors);
 }
 
+/*
+ * Find the disk number which triggered given bio
+ */
+static int find_bio_disk(conf_t *conf, r10bio_t *r10_bio, struct bio *bio)
+{
+        int slot;
+
+        for (slot = 0; slot < conf->copies; slot++)
+                if (r10_bio->devs[slot].bio == bio)
+                        break;
+
+        BUG_ON(slot == conf->copies);
+        update_head_pos(slot, r10_bio);
+
+        return r10_bio->devs[slot].devnum;
+}
+
 static void raid10_end_read_request(struct bio *bio, int error)
 {
         int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
@@ -289,13 +306,10 @@ static void raid10_end_write_request(struct bio *bio, int error)
 {
         int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
         r10bio_t *r10_bio = bio->bi_private;
-        int slot, dev;
+        int dev;
         conf_t *conf = r10_bio->mddev->private;
 
-        for (slot = 0; slot < conf->copies; slot++)
-                if (r10_bio->devs[slot].bio == bio)
-                        break;
-        dev = r10_bio->devs[slot].devnum;
+        dev = find_bio_disk(conf, r10_bio, bio);
 
         /*
          * this branch is our 'one mirror IO has finished' event handler:
@@ -316,8 +330,6 @@ static void raid10_end_write_request(struct bio *bio, int error)
                  */
                 set_bit(R10BIO_Uptodate, &r10_bio->state);
 
-        update_head_pos(slot, r10_bio);
-
         /*
          *
          * Let's see if all mirrored write operations have finished
@@ -1173,14 +1185,9 @@ static void end_sync_read(struct bio *bio, int error)
 {
         r10bio_t *r10_bio = bio->bi_private;
         conf_t *conf = r10_bio->mddev->private;
-        int i,d;
+        int d;
 
-        for (i=0; i<conf->copies; i++)
-                if (r10_bio->devs[i].bio == bio)
-                        break;
-        BUG_ON(i == conf->copies);
-        update_head_pos(i, r10_bio);
-        d = r10_bio->devs[i].devnum;
+        d = find_bio_disk(conf, r10_bio, bio);
 
         if (test_bit(BIO_UPTODATE, &bio->bi_flags))
                 set_bit(R10BIO_Uptodate, &r10_bio->state);
@@ -1211,18 +1218,13 @@ static void end_sync_write(struct bio *bio, int error)
         r10bio_t *r10_bio = bio->bi_private;
         mddev_t *mddev = r10_bio->mddev;
         conf_t *conf = mddev->private;
-        int i,d;
+        int d;
 
-        for (i = 0; i < conf->copies; i++)
-                if (r10_bio->devs[i].bio == bio)
-                        break;
-        d = r10_bio->devs[i].devnum;
+        d = find_bio_disk(conf, r10_bio, bio);
 
         if (!uptodate)
                 md_error(mddev, conf->mirrors[d].rdev);
 
-        update_head_pos(i, r10_bio);
-
         rdev_dec_pending(conf->mirrors[d].rdev, mddev);
         while (atomic_dec_and_test(&r10_bio->remaining)) {
                 if (r10_bio->master_bio == NULL) {