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[Qemu-devel] [PATCH v2 17/17] block: look for zero blocks in bs->file
From: |
Paolo Bonzini |
Subject: |
[Qemu-devel] [PATCH v2 17/17] block: look for zero blocks in bs->file |
Date: |
Tue, 16 Jul 2013 18:29:28 +0200 |
Signed-off-by: Paolo Bonzini <address@hidden>
---
block.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/block.c b/block.c
index 557ce29..2d7d71f 100644
--- a/block.c
+++ b/block.c
@@ -2977,7 +2977,7 @@ static int64_t coroutine_fn
bdrv_co_get_block_status(BlockDriverState *bs,
int nb_sectors, int *pnum)
{
int64_t n;
- int64_t ret;
+ int64_t ret, ret2;
if (sector_num >= bs->total_sectors) {
*pnum = 0;
@@ -3003,6 +3003,14 @@ static int64_t coroutine_fn
bdrv_co_get_block_status(BlockDriverState *bs,
ret |= BDRV_BLOCK_ZERO;
}
+ if (bs->file &&
+ (ret & BDRV_BLOCK_DATA) && !(ret & BDRV_BLOCK_ZERO) &&
+ (ret & BDRV_BLOCK_OFFSET_VALID)) {
+ ret2 = bdrv_co_get_block_status(bs->file, ret >> BDRV_SECTOR_BITS,
+ *pnum, pnum);
+ ret |= (ret2 & BDRV_BLOCK_ZERO);
+ }
+
return ret;
}
--
1.8.3.1
- [Qemu-devel] [PATCH v2 12/17] qemu-img: add a "map" subcommand, (continued)
- [Qemu-devel] [PATCH v2 12/17] qemu-img: add a "map" subcommand, Paolo Bonzini, 2013/07/16
- [Qemu-devel] [PATCH v2 14/17] raw-posix: return get_block_status data and flags, Paolo Bonzini, 2013/07/16
- [Qemu-devel] [PATCH v2 15/17] raw-posix: detect XFS unwritten extents, Paolo Bonzini, 2013/07/16
- [Qemu-devel] [PATCH v2 16/17] block: add default get_block_status implementation for protocols, Paolo Bonzini, 2013/07/16
- [Qemu-devel] [PATCH v2 17/17] block: look for zero blocks in bs->file,
Paolo Bonzini <=
- Re: [Qemu-devel] [PATCH v2 17/17] block: look for zero blocks in bs->file, Eric Blake, 2013/07/19
- [Qemu-devel] [PATCH v2 06/17] block: expect errors from bdrv_co_is_allocated, Paolo Bonzini, 2013/07/16
- [Qemu-devel] [PATCH v2 07/17] qemu-img: always probe the input image for allocated sectors, Paolo Bonzini, 2013/07/16
- [Qemu-devel] [PATCH v2 05/17] block: remove bdrv_is_allocated_above/bdrv_co_is_allocated_above distinction, Paolo Bonzini, 2013/07/16