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-rw-r--r--fs/btrfs/extent-tree.c15
1 files changed, 7 insertions, 8 deletions
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index d3df65f83b5..1bb408f737f 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -2975,17 +2975,16 @@ again:
}
spin_unlock(&block_group->lock);
- num_pages = (int)div64_u64(block_group->key.offset, 1024 * 1024 * 1024);
+ /*
+ * Try to preallocate enough space based on how big the block group is.
+ * Keep in mind this has to include any pinned space which could end up
+ * taking up quite a bit since it's not folded into the other space
+ * cache.
+ */
+ num_pages = (int)div64_u64(block_group->key.offset, 256 * 1024 * 1024);
if (!num_pages)
num_pages = 1;
- /*
- * Just to make absolutely sure we have enough space, we're going to
- * preallocate 12 pages worth of space for each block group. In
- * practice we ought to use at most 8, but we need extra space so we can
- * add our header and have a terminator between the extents and the
- * bitmaps.
- */
num_pages *= 16;
num_pages *= PAGE_CACHE_SIZE;