[Qemu-devel] [PATCH v2 09/18] block: add host_block_size

[Paolo Bonzini <pbonzini@redhat.com>]

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 block.c     |    4 +++-
 block_int.h |    3 +++
 2 files changed, 6 insertions(+), 1 deletions(-)

diff --git a/block.c b/block.c
index 2e1ebeb..af41fb3 100644
--- a/block.c
+++ b/block.c
@@ -591,6 +591,7 @@ static int bdrv_open_common(BlockDriverState *bs, const char *filename,
     bs->sg = 0;
     bs->growable = 0;
     bs->guest_block_size = 512;
+    bs->host_block_size = 512;
 
     assert(bs->copy_on_read == 0); /* bdrv_new() and bdrv_close() make it so */
     if ((flags & BDRV_O_RDWR) && (flags & BDRV_O_COPY_ON_READ)) {
@@ -616,6 +617,7 @@ static int bdrv_open_common(BlockDriverState *bs, const char *filename,
         ret = bdrv_file_open(&bs->file, filename, bs->open_flags);
         if (ret >= 0) {
             bs->open_flags = bs->file->open_flags;
+            bs->host_block_size = bs->file->host_block_size;
             ret = drv->bdrv_open(bs, bs->open_flags);
         }
     }
@@ -3611,7 +3613,7 @@ void bdrv_set_guest_block_size(BlockDriverState *bs, int align)
 
 void *qemu_blockalign(BlockDriverState *bs, size_t size)
 {
-    return qemu_memalign((bs && bs->guest_block_size) ? bs->guest_block_size : 512, size);
+    return qemu_memalign(bs ? bs->host_block_size : 512, size);
 }
 
 void bdrv_set_dirty_tracking(BlockDriverState *bs, int enable)
diff --git a/block_int.h b/block_int.h
index dfde061..06e5d35 100644
--- a/block_int.h
+++ b/block_int.h
@@ -276,6 +276,9 @@ struct BlockDriverState {
     /* the memory alignment used by the guest for the buffers handled by this driver */
     int guest_block_size;
 
+    /* the memory alignment required by the device for the buffers handled by this driver */
+    int host_block_size;
+
     /* NOTE: the following infos are only hints for real hardware
        drivers. They are not used by the block driver */
     int cyls, heads, secs, translation;
-- 
1.7.7.6