libext2fs: grow dblist more aggressively

Make the dblist grow more quickly when many directory blocks are added,
otherwise the array has to get copied too often, which is slow when it
is large.

Signed-off-by: Andreas Dilger <adilger@sun.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>

diff --git a/lib/ext2fs/dblist.c b/lib/ext2fs/dblist.c
index 0067cae..188e36e 100644 (file)
--- a/lib/ext2fs/dblist.c
+++ b/lib/ext2fs/dblist.c
@@ -164,7 +164,7 @@ errcode_t ext2fs_add_dir_block(ext2_dblist dblist, ext2_ino_t ino, blk_t blk,
 
        if (dblist->count >= dblist->size) {
                old_size = dblist->size * sizeof(struct ext2_db_entry);
-               dblist->size += 100;
+               dblist->size += dblist->size > 200 ? dblist->size / 2 : 100;
                retval = ext2fs_resize_mem(old_size, (size_t) dblist->size *
                                           sizeof(struct ext2_db_entry),
                                           &dblist->list);