Btrfs: cache the extent tree preallocation
Signed-off-by: Chris Mason <chris.mason@oracle.com>
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index e0738c6..47e9118 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -741,7 +741,6 @@
BUG_ON(ret);
}
extent_root->fs_info->extent_tree_insert_nr = 0;
- extent_root->fs_info->extent_tree_prealloc_nr = 0;
return 0;
}
@@ -951,6 +950,18 @@
num_blocks = 1;
total_needed = (min(level + 1, BTRFS_MAX_LEVEL) + 2) * 3;
}
+ if (fill_prealloc) {
+ u64 first;
+ int nr = info->extent_tree_prealloc_nr;
+ first = info->extent_tree_prealloc[nr - 1];
+ if (info->extent_tree_prealloc_nr >= total_needed &&
+ first >= search_start) {
+ ins->objectid = info->extent_tree_prealloc[0];
+ ins->offset = 1;
+ return 0;
+ }
+ info->extent_tree_prealloc_nr = 0;
+ }
if (search_end == (u64)-1)
search_end = btrfs_super_total_blocks(info->disk_super);
if (hint_block) {
@@ -1107,7 +1118,6 @@
if (ins->objectid + num_blocks > first &&
ins->objectid <= info->extent_tree_prealloc[0]) {
search_start = info->extent_tree_prealloc[0] + 1;
- WARN_ON(!full_scan);
goto new_group;
}
}