Remove b_thawed from arc_buf_hdr_t

The code involving b_thawed appears to be dead, so lets discard it.

Signed-off-by: Richard Yao <ryao@gentoo.org>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Issue #1614

diff --git a/module/zfs/arc.c b/module/zfs/arc.c
index 75ce17436ecd2cf5592812b81be7df97b0050e19..89f5fe5f0272e9706a1e6cd838c10831b2a47c44 100644 (file)
--- a/module/zfs/arc.c
+++ b/module/zfs/arc.c
@@ -501,7 +501,6 @@ struct arc_buf_hdr {
 
        kmutex_t                b_freeze_lock;
        zio_cksum_t             *b_freeze_cksum;
-       void                    *b_thawed;
 
        arc_buf_hdr_t           *b_hash_next;
        arc_buf_t               *b_buf;
@@ -1033,12 +1032,6 @@ arc_buf_thaw(arc_buf_t *buf)
                buf->b_hdr->b_freeze_cksum = NULL;
        }
 
-       if (zfs_flags & ZFS_DEBUG_MODIFY) {
-               if (buf->b_hdr->b_thawed)
-                       kmem_free(buf->b_hdr->b_thawed, 1);
-               buf->b_hdr->b_thawed = kmem_alloc(1, KM_SLEEP);
-       }
-
        mutex_exit(&buf->b_hdr->b_freeze_lock);
 }
 
@@ -1564,10 +1557,6 @@ arc_hdr_destroy(arc_buf_hdr_t *hdr)
                kmem_free(hdr->b_freeze_cksum, sizeof (zio_cksum_t));
                hdr->b_freeze_cksum = NULL;
        }
-       if (hdr->b_thawed) {
-               kmem_free(hdr->b_thawed, 1);
-               hdr->b_thawed = NULL;
-       }
 
        ASSERT(!list_link_active(&hdr->b_arc_node));
        ASSERT3P(hdr->b_hash_next, ==, NULL);