btrfs: drop num argument from find_live_mirror()

Obtain the stripes info from the map directly and so no need
to pass it as an argument.

Signed-off-by: Anand Jain <anand.jain@oracle.com>
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index dcc2b48..82c21f6 100644 (file)
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -5274,13 +5274,22 @@ int btrfs_is_parity_mirror(struct btrfs_fs_info *fs_info, u64 logical, u64 len)
 }
 
 static int find_live_mirror(struct btrfs_fs_info *fs_info,
-                           struct map_lookup *map, int first, int num,
+                           struct map_lookup *map, int first,
                            int optimal, int dev_replace_is_ongoing)
 {
        int i;
+       int num_stripes;
        int tolerance;
        struct btrfs_device *srcdev;
 
+       ASSERT((map->type &
+                (BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID10)));
+
+       if (map->type & BTRFS_BLOCK_GROUP_RAID10)
+               num_stripes = map->sub_stripes;
+       else
+               num_stripes = map->num_stripes;
+
        if (dev_replace_is_ongoing &&
            fs_info->dev_replace.cont_reading_from_srcdev_mode ==
             BTRFS_DEV_REPLACE_ITEM_CONT_READING_FROM_SRCDEV_MODE_AVOID)
@@ -5297,7 +5306,7 @@ static int find_live_mirror(struct btrfs_fs_info *fs_info,
                if (map->stripes[optimal].dev->bdev &&
                    (tolerance || map->stripes[optimal].dev != srcdev))
                        return optimal;
-               for (i = first; i < first + num; i++) {
+               for (i = first; i < first + num_stripes; i++) {
                        if (map->stripes[i].dev->bdev &&
                            (tolerance || map->stripes[i].dev != srcdev))
                                return i;
@@ -5834,7 +5843,6 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info,
                        stripe_index = mirror_num - 1;
                else {
                        stripe_index = find_live_mirror(fs_info, map, 0,
-                                           map->num_stripes,
                                            current->pid % map->num_stripes,
                                            dev_replace_is_ongoing);
                        mirror_num = stripe_index + 1;
@@ -5863,7 +5871,7 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info,
                        int old_stripe_index = stripe_index;
                        stripe_index = find_live_mirror(fs_info, map,
                                              stripe_index,
-                                             map->sub_stripes, stripe_index +
+                                             stripe_index +
                                              current->pid % map->sub_stripes,
                                              dev_replace_is_ongoing);
                        mirror_num = stripe_index - old_stripe_index + 1;