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unplug_page
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)
+...