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Btrfs: don't keep trying to build clusters if we are fragmented

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If we are extremely fragmented then we won't be able to create a free_cluster.
So if this happens set last_ptr->fragmented so that all future allcations will
give up trying to create a cluster.  When we unpin extents we will unset
->fragmented if we free up a sufficient amount of space in a block group.
Thanks,

Signed-off-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: Chris Mason <clm@fb.com>
This commit is contained in:
Josef Bacik
2015-10-02 15:25:10 -04:00
committed by Chris Mason
parent a5e681d9bd
commit c759c4e161
3 changed files with 82 additions and 24 deletions
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1
fs/btrfs/free-space-cache.c
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@@ -3063,6 +3063,7 @@ void btrfs_init_free_cluster(struct btrfs_free_cluster *cluster)
spin_lock_init(&cluster->refill_lock);
cluster->root = RB_ROOT;
cluster->max_size = 0;
cluster->fragmented = false;
INIT_LIST_HEAD(&cluster->block_group_list);
cluster->block_group = NULL;
}