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ext4_bcache: add max cache depth watermark

--- a/fs_test/common/test_lwext4.c

+++ b/fs_test/common/test_lwext4.c

@@ -130,9 +130,9 @@

 	printf("bdev->bread_ctr = %" PRIu32 "\n", bd->bdif->bread_ctr);

 	printf("bdev->bwrite_ctr = %" PRIu32 "\n", bd->bdif->bwrite_ctr);

-	printf("bcache->ref_blocks = %" PRIu32 "\n", bc->ref_blocks);

-	printf("bcache->max_ref_blocks = %" PRIu32 "\n", bc->max_ref_blocks);

-	printf("bcache->lru_ctr = %" PRIu32 "\n", bc->lru_ctr);

+	printf("bcache->ref_blocks = %" PRIu32 "\n", bd->bc->ref_blocks);

+	printf("bcache->max_ref_blocks = %" PRIu32 "\n", bd->bc->max_ref_blocks);

+	printf("bcache->lru_ctr = %" PRIu32 "\n", bd->bc->lru_ctr);

 	printf("\n");

--- a/lwext4/ext4_bcache.c

+++ b/lwext4/ext4_bcache.c

@@ -239,6 +239,11 @@

 	/* One more buffer in bcache now. :-) */

 	bc->ref_blocks++;

+	/*Calc ref blocks max depth*/

+	if (bc->max_ref_blocks < bc->ref_blocks)

+		bc->max_ref_blocks = bc->ref_blocks;

+

+

 	ext4_bcache_inc_ref(buf);

 	/* Assign new value to LRU id and increment LRU counter

 	 * by 1*/