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-rw-r--r--fs/ext4/mballoc.h10
1 files changed, 8 insertions, 2 deletions
diff --git a/fs/ext4/mballoc.h b/fs/ext4/mballoc.h
index bfe6add46bcf..c7c9906c2a75 100644
--- a/fs/ext4/mballoc.h
+++ b/fs/ext4/mballoc.h
@@ -164,11 +164,17 @@ struct ext4_free_extent {
* Locality group:
* we try to group all related changes together
* so that writeback can flush/allocate them together as well
+ * Size of lg_prealloc_list hash is determined by MB_DEFAULT_GROUP_PREALLOC
+ * (512). We store prealloc space into the hash based on the pa_free blocks
+ * order value.ie, fls(pa_free)-1;
*/
+#define PREALLOC_TB_SIZE 10
struct ext4_locality_group {
/* for allocator */
- struct mutex lg_mutex; /* to serialize allocates */
- struct list_head lg_prealloc_list;/* list of preallocations */
+ /* to serialize allocates */
+ struct mutex lg_mutex;
+ /* list of preallocations */
+ struct list_head lg_prealloc_list[PREALLOC_TB_SIZE];
spinlock_t lg_prealloc_lock;
};