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[Qemu-devel] [RFC PATCH 1/4] block: add BlockDriver.bdrv_zero_init.


From: Hu Tao
Subject: [Qemu-devel] [RFC PATCH 1/4] block: add BlockDriver.bdrv_zero_init.
Date: Tue, 12 Nov 2013 15:47:19 +0800

This field is used to zero-initialize block device. It can be
used to preallocate space for the block device.

Signed-off-by: Hu Tao <address@hidden>
---
 block.c                   | 13 +++++++++++++
 include/block/block.h     |  1 +
 include/block/block_int.h |  2 ++
 3 files changed, 16 insertions(+)

diff --git a/block.c b/block.c
index 58efb5b..6bd2e8b 100644
--- a/block.c
+++ b/block.c
@@ -3095,6 +3095,19 @@ int bdrv_has_zero_init(BlockDriverState *bs)
     return 0;
 }
 
+int bdrv_zero_init(BlockDriverState *bs, int64_t offset, int64_t length)
+{
+    if (bs->backing_hd) {
+        return -1;
+    }
+
+    if (bs->drv->bdrv_zero_init) {
+        return bs->drv->bdrv_zero_init(bs, offset, length);
+    }
+
+    return -1;
+}
+
 typedef struct BdrvCoGetBlockStatusData {
     BlockDriverState *bs;
     BlockDriverState *base;
diff --git a/include/block/block.h b/include/block/block.h
index 3560deb..a0595d1 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -315,6 +315,7 @@ void bdrv_drain_all(void);
 int bdrv_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors);
 int bdrv_co_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors);
 int bdrv_has_zero_init_1(BlockDriverState *bs);
+int bdrv_zero_init(BlockDriverState *bs, int64_t offset, int64_t length);
 int bdrv_has_zero_init(BlockDriverState *bs);
 int64_t bdrv_get_block_status(BlockDriverState *bs, int64_t sector_num,
                               int nb_sectors, int *pnum);
diff --git a/include/block/block_int.h b/include/block/block_int.h
index 1666066..069b6ce 100644
--- a/include/block/block_int.h
+++ b/include/block/block_int.h
@@ -227,6 +227,8 @@ struct BlockDriver {
      */
     int (*bdrv_has_zero_init)(BlockDriverState *bs);
 
+    int (*bdrv_zero_init)(BlockDriverState *bs, int64_t offset, int64_t 
length);
+
     QLIST_ENTRY(BlockDriver) list;
 };
 
-- 
1.8.3.1




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