diff mbox

[PATCHv2,1/4] BlockLimits: introduce max_transfer_length

Message ID 1410520912-7557-2-git-send-email-pl@kamp.de
State New
Headers show

Commit Message

Peter Lieven Sept. 12, 2014, 11:21 a.m. UTC 
Signed-off-by: Peter Lieven <pl@kamp.de>
Reviewed-by: Ronnie Sahlberg <ronniesahlberg@gmail.com>

---
 block.c                   |    4 ++++
 include/block/block_int.h |    3 +++
 2 files changed, 7 insertions(+)
diff mbox

Patch

diff --git a/block.c b/block.c
index d06dd51..c87e9fd 100644
--- a/block.c
+++ b/block.c
@@ -529,6 +529,7 @@  void bdrv_refresh_limits(BlockDriverState *bs, Error **errp)
             return;
         }
         bs->bl.opt_transfer_length = bs->file->bl.opt_transfer_length;
+        bs->bl.max_transfer_length = bs->file->bl.max_transfer_length;
         bs->bl.opt_mem_alignment = bs->file->bl.opt_mem_alignment;
     } else {
         bs->bl.opt_mem_alignment = 512;
@@ -543,6 +544,9 @@  void bdrv_refresh_limits(BlockDriverState *bs, Error **errp)
         bs->bl.opt_transfer_length =
             MAX(bs->bl.opt_transfer_length,
                 bs->backing_hd->bl.opt_transfer_length);
+        bs->bl.max_transfer_length =
+            MIN(bs->bl.max_transfer_length,
+                bs->backing_hd->bl.max_transfer_length);
         bs->bl.opt_mem_alignment =
             MAX(bs->bl.opt_mem_alignment,
                 bs->backing_hd->bl.opt_mem_alignment);
diff --git a/include/block/block_int.h b/include/block/block_int.h
index 8a61215..e178782 100644
--- a/include/block/block_int.h
+++ b/include/block/block_int.h
@@ -288,6 +288,9 @@  typedef struct BlockLimits {
     /* optimal transfer length in sectors */
     int opt_transfer_length;
 
+    /* maximal transfer length in sectors */
+    int max_transfer_length;
+
     /* memory alignment so that no bounce buffer is needed */
     size_t opt_mem_alignment;
 } BlockLimits;