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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: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason 2009-06-09 18:35:15 -04:00
parent 3b30c22f64
commit c604480171
1 changed files with 2 additions and 1 deletions
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3
fs/btrfs/free-space-cache.c
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@ -645,7 +645,8 @@ again:
* we haven't filled the empty size and the window is
* 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;
window_start = entry->offset;
window_free = entry->bytes;