[PATCH 3/4] block/io: bdrv_check_byte_request(): drop bdrv_is_inserted()

[Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>]

Move bdrv_is_inserted() calls into callers.

We are going to make bdrv_check_byte_request() a clean thing.
bdrv_is_inserted() is not about checking the request, it's about
checking the bs. So, it should be separate.

With this patch we probably change error path for some failure
scenarios. But depending on the fact that querying too big request on
empty cdrom (or corrupted qcow2 node with no drv) will result in EIO
and not ENOMEDIUM would be very strange. More over, we are going to
move to 64bit requests, so larger requests will be allowed anyway.

More over, keeping in mind that cdrom is the only driver that has
.bdrv_is_inserted() handler it's strange that we should care so much
about it in generic block layer, intuitively we should just do read and
write, and cdrom driver should return correct errors if it is not
inserted. But it's a work for another series.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
---
 block/io.c | 25 ++++++++++++-------------
 1 file changed, 12 insertions(+), 13 deletions(-)

diff --git a/block/io.c b/block/io.c
index 3e91074c9f..ef75a5abb4 100644
--- a/block/io.c
+++ b/block/io.c
@@ -884,17 +884,12 @@ static bool coroutine_fn bdrv_wait_serialising_requests(BdrvTrackedRequest *self
     return waited;
 }
 
-static int bdrv_check_byte_request(BlockDriverState *bs, int64_t offset,
-                                   size_t size)
+static int bdrv_check_byte_request(int64_t offset, size_t size)
 {
     if (size > BDRV_REQUEST_MAX_BYTES) {
         return -EIO;
     }
 
-    if (!bdrv_is_inserted(bs)) {
-        return -ENOMEDIUM;
-    }
-
     if (offset < 0) {
         return -EIO;
     }
@@ -1642,7 +1637,11 @@ int coroutine_fn bdrv_co_preadv_part(BdrvChild *child,
 
     trace_bdrv_co_preadv(bs, offset, bytes, flags);
 
-    ret = bdrv_check_byte_request(bs, offset, bytes);
+    if (!bdrv_is_inserted(bs)) {
+        return -ENOMEDIUM;
+    }
+
+    ret = bdrv_check_byte_request(offset, bytes);
     if (ret < 0) {
         return ret;
     }
@@ -2054,11 +2053,11 @@ int coroutine_fn bdrv_co_pwritev_part(BdrvChild *child,
 
     trace_bdrv_co_pwritev(child->bs, offset, bytes, flags);
 
-    if (!bs->drv) {
+    if (!bdrv_is_inserted(bs)) {
         return -ENOMEDIUM;
     }
 
-    ret = bdrv_check_byte_request(bs, offset, bytes);
+    ret = bdrv_check_byte_request(offset, bytes);
     if (ret < 0) {
         return ret;
     }
@@ -3045,10 +3044,10 @@ static int coroutine_fn bdrv_co_copy_range_internal(
     assert(!(read_flags & BDRV_REQ_NO_FALLBACK));
     assert(!(write_flags & BDRV_REQ_NO_FALLBACK));
 
-    if (!dst || !dst->bs) {
+    if (!dst || !dst->bs || !bdrv_is_inserted(dst->bs)) {
         return -ENOMEDIUM;
     }
-    ret = bdrv_check_byte_request(dst->bs, dst_offset, bytes);
+    ret = bdrv_check_byte_request(dst_offset, bytes);
     if (ret) {
         return ret;
     }
@@ -3056,10 +3055,10 @@ static int coroutine_fn bdrv_co_copy_range_internal(
         return bdrv_co_pwrite_zeroes(dst, dst_offset, bytes, write_flags);
     }
 
-    if (!src || !src->bs) {
+    if (!src || !src->bs || !bdrv_is_inserted(src->bs)) {
         return -ENOMEDIUM;
     }
-    ret = bdrv_check_byte_request(src->bs, src_offset, bytes);
+    ret = bdrv_check_byte_request(src_offset, bytes);
     if (ret) {
         return ret;
     }
-- 
2.21.3