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Btrfs: try to allocate from cluster even at LOOP_NO_EMPTY_SIZE 

If we reach LOOP_NO_EMPTY_SIZE, we won't even try to use a cluster that
others might have set up.  Odds are that there won't be one, but if
someone else succeeded in setting it up, we might as well use it, even
if we don't try to set up a cluster again.

Signed-off-by: Alexandre Oliva <oliva@lsd.ic.unicamp.br>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Alexandre Oliva 2011-12-07 19:50:42 -05:00 committed by Chris Mason
parent f4a8e6563e
commit 062c05c46b
1 changed files with 18 additions and 8 deletions
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26
fs/btrfs/extent-tree.c
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@ -5285,15 +5285,10 @@ alloc:
spin_unlock(&block_group->free_space_ctl->tree_lock);
/*
* Ok we want to try and use the cluster allocator, so lets look
* there, unless we are on LOOP_NO_EMPTY_SIZE, since we will
* have tried the cluster allocator plenty of times at this
* point and not have found anything, so we are likely way too
* fragmented for the clustering stuff to find anything, so lets
* just skip it and let the allocator find whatever block it can
* find
* Ok we want to try and use the cluster allocator, so
* lets look there
*/
if (last_ptr && loop < LOOP_NO_EMPTY_SIZE) {
if (last_ptr) {
/*
* the refill lock keeps out other
* people trying to start a new cluster
@ -5342,6 +5337,20 @@ alloc:
}
spin_unlock(&last_ptr->lock);
refill_cluster:
/* If we are on LOOP_NO_EMPTY_SIZE, we can't
* set up a new clusters, so lets just skip it
* and let the allocator find whatever block
* it can find. If we reach this point, we
* will have tried the cluster allocator
* plenty of times and not have found
* anything, so we are likely way too
* fragmented for the clustering stuff to find
* anything. */
if (loop >= LOOP_NO_EMPTY_SIZE) {
spin_unlock(&last_ptr->refill_lock);
goto unclustered_alloc;
}
/*
* this cluster didn't work out, free it and
* start over
@ -5389,6 +5398,7 @@ refill_cluster:
goto loop;
}
unclustered_alloc:
offset = btrfs_find_space_for_alloc(block_group, search_start,
num_bytes, empty_size);
/*