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[Qemu-devel] [PATCH v3 15/19] block: use bdrv_has_zero_init to return BD
From: |
Paolo Bonzini |
Subject: |
[Qemu-devel] [PATCH v3 15/19] block: use bdrv_has_zero_init to return BDRV_BLOCK_ZERO |
Date: |
Thu, 25 Jul 2013 16:23:13 +0200 |
Alternatively, this could use a "discard zeroes data" flag returned
by bdrv_get_info.
Reviewed-by: Eric Blake <address@hidden>
Signed-off-by: Paolo Bonzini <address@hidden>
---
block.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/block.c b/block.c
index 7cfbf71..fc1da56 100644
--- a/block.c
+++ b/block.c
@@ -2991,6 +2991,7 @@ static int64_t coroutine_fn
bdrv_co_get_block_status(BlockDriverState *bs,
int nb_sectors, int *pnum)
{
int64_t n;
+ int64_t ret;
if (sector_num >= bs->total_sectors) {
*pnum = 0;
@@ -3007,7 +3008,12 @@ static int64_t coroutine_fn
bdrv_co_get_block_status(BlockDriverState *bs,
return BDRV_BLOCK_DATA;
}
- return bs->drv->bdrv_co_get_block_status(bs, sector_num, nb_sectors, pnum);
+ ret = bs->drv->bdrv_co_get_block_status(bs, sector_num, nb_sectors, pnum);
+ if (!(ret & BDRV_BLOCK_DATA) && bdrv_has_zero_init(bs)) {
+ ret |= BDRV_BLOCK_ZERO;
+ }
+
+ return ret;
}
/* Coroutine wrapper for bdrv_get_block_status() */
--
1.8.3.1
- Re: [Qemu-devel] [PATCH v3 11/19] block: define get_block_status return value, (continued)
[Qemu-devel] [PATCH v3 14/19] docs, qapi: document qemu-img map, Paolo Bonzini, 2013/07/25
[Qemu-devel] [PATCH v3 15/19] block: use bdrv_has_zero_init to return BDRV_BLOCK_ZERO,
Paolo Bonzini <=
[Qemu-devel] [PATCH v3 16/19] raw-posix: return get_block_status data and flags, Paolo Bonzini, 2013/07/25
[Qemu-devel] [PATCH v3 17/19] raw-posix: detect XFS unwritten extents, Paolo Bonzini, 2013/07/25
[Qemu-devel] [PATCH v3 18/19] block: add default get_block_status implementation for protocols, Paolo Bonzini, 2013/07/25
[Qemu-devel] [PATCH v3 19/19] block: look for zero blocks in bs->file, Paolo Bonzini, 2013/07/25