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authorChris Mason <chris.mason@oracle.com>2009-06-09 18:35:15 -0400
committerChris Mason <chris.mason@oracle.com>2009-06-10 11:29:51 -0400
commitc604480171c510c1beeb81b82418e5bc4de8f1ae (patch)
tree54be031aa42874f827e1c7d2aa79f1ec54b36a33 /fs/btrfs/free-space-cache.c
parent3b30c22f64a6bb297719c60e494af1d26563f584 (diff)
downloadblackbird-obmc-linux-c604480171c510c1beeb81b82418e5bc4de8f1ae.tar.gz
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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>
Diffstat (limited to 'fs/btrfs/free-space-cache.c')
-rw-r--r--fs/btrfs/free-space-cache.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/btrfs/free-space-cache.c b/fs/btrfs/free-space-cache.c
index 280165581c57..ac23476beb6e 100644
--- a/fs/btrfs/free-space-cache.c
+++ b/fs/btrfs/free-space-cache.c
@@ -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;
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