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[Qemu-devel] [PATCH 13/17] block: use bdrv_has_zero_init to return BDRV_
From: |
Paolo Bonzini |
Subject: |
[Qemu-devel] [PATCH 13/17] block: use bdrv_has_zero_init to return BDRV_BLOCK_ZERO |
Date: |
Wed, 3 Jul 2013 16:34:27 +0200 |
Alternatively, this could use a "discard zeroes data" flag returned
by bdrv_get_info.
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 8931cac..cd371cd 100644
--- a/block.c
+++ b/block.c
@@ -2963,6 +2963,7 @@ 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;
@@ -2979,7 +2980,12 @@ 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() */
--
1.8.2.1
- [Qemu-devel] [PATCH 12/17] qemu-img: add a "map" subcommand, (continued)
- [Qemu-devel] [PATCH 11/17] block: return get_block_status data and flags for formats, Paolo Bonzini, 2013/07/03
- [Qemu-devel] [PATCH 14/17] raw-posix: return get_block_status data and flags, Paolo Bonzini, 2013/07/03
- [Qemu-devel] [PATCH 13/17] block: use bdrv_has_zero_init to return BDRV_BLOCK_ZERO,
Paolo Bonzini <=
- [Qemu-devel] [PATCH 15/17] raw-posix: detect XFS unwritten extents, Paolo Bonzini, 2013/07/03
- [Qemu-devel] [PATCH 16/17] block: add default get_block_status implementation for protocols, Paolo Bonzini, 2013/07/03
[Qemu-devel] [PATCH 17/17] block: look for zero blocks in bs->file, Paolo Bonzini, 2013/07/03
Re: [Qemu-devel] [PATCH 00/17] Add qemu-img subcommand to dump file metadata, Stefan Hajnoczi, 2013/07/15