[Qemu-devel] [PULL 37/42] raw-posix: report unwritten extents as zero

[Stefan Hajnoczi <stefanha@redhat.com>]

From: Paolo Bonzini <pbonzini@redhat.com>

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 d011cfd..1b41ea3 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
-- 
1.8.3.1