Commit c6044801 authored by Chris Mason's avatar Chris Mason

Btrfs: avoid allocation clusters that are too spread out

In SSD mode for data, and all the time for metadata the allocator
will try to find a cluster of nearby blocks for allocations.  This
commit adds extra checks to make sure that each free block in the
cluster is close to the last one.
Signed-off-by: default avatarChris Mason <chris.mason@oracle.com>
parent 3b30c22f
...@@ -645,7 +645,8 @@ int btrfs_find_space_cluster(struct btrfs_trans_handle *trans, ...@@ -645,7 +645,8 @@ int btrfs_find_space_cluster(struct btrfs_trans_handle *trans,
* we haven't filled the empty size and the window is * we haven't filled the empty size and the window is
* very large. reset and try again * very large. reset and try again
*/ */
if (next->offset - window_start > (bytes + empty_size) * 2) { if (next->offset - (last->offset + last->bytes) > 128 * 1024 ||
next->offset - window_start > (bytes + empty_size) * 2) {
entry = next; entry = next;
window_start = entry->offset; window_start = entry->offset;
window_free = entry->bytes; window_free = entry->bytes;
......
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