From f5f7abcfd50bca38ae278a9c7a3ed60fba3d76dc Mon Sep 17 00:00:00 2001
From: Paolo Bonzini <pbonzini@redhat.com>
Date: Wed, 4 Sep 2013 19:00:36 +0200
Subject: [PATCH] raw-posix: report unwritten extents as zero
These are created for example with XFS_IOC_ZERO_RANGE.
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
---
block/raw-posix.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/block/raw-posix.c b/block/raw-posix.c
index d011cfdab6..1b41ea3356 100644
--- a/block/raw-posix.c
+++ b/block/raw-posix.c
@@ -1128,6 +1128,9 @@ static int64_t coroutine_fn raw_co_get_block_status(BlockDriverState *bs,
} else {
data = f.fe.fe_logical;
hole = f.fe.fe_logical + f.fe.fe_length;
+ if (f.fe.fe_flags & FIEMAP_EXTENT_UNWRITTEN) {
+ ret |= BDRV_BLOCK_ZERO;
+ }
}
#elif defined SEEK_HOLE && defined SEEK_DATA
--
2.30.2