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2010 Jan 04
0
[RFC 03/12 RESEND PATCH] Btrfs: Reorder __btrfs_map_block to make code more efficient.
...tripes_allocated < stripes_required) { - stripes_allocated = map->num_stripes; - free_extent_map(em); - kfree(multi); - goto again; - } stripe_nr = offset; /* * stripe_nr counts the total number of stripes we have to stride @@ -2711,6 +2676,18 @@ again: if (!multi_ret && !unplug_page) goto out; + if (mirror_num > map->num_stripes) + mirror_num = 0; + + max_errors = 0; + if (rw & (1 << BIO_RW)) { + if (map->type & (BTRFS_BLOCK_GROUP_RAID1 | + BTRFS_BLOCK_GROUP_DUP)) + max_errors = 1; + else if (map->type & BTRFS_BLOCK_GROUP_RAID10) +...