block: Avoid unecessary drv->bdrv_getlength() calls

The block layer generally keeps the size of an image cached in
bs->total_sectors so that it doesn't have to perform expensive
operations to get the size whenever it needs it.

This doesn't work however when using a backend that can change its size
without qemu being aware of it, i.e. passthrough of removable media like
CD-ROMs or floppy disks. For this reason, the caching is disabled when a
removable device is used.

It is obvious that checking whether the _guest_ device has removable
media isn't the right thing to do when we want to know whether the size
of the host backend can change. To make things worse, non-top-level
BlockDriverStates never have any device attached, which makes qemu
assume they are removable, so drv->bdrv_getlength() is always called on
the protocol layer. In the case of raw-posix, this causes unnecessary
lseek() system calls, which turned out to be rather expensive.

This patch completely changes the logic and disables bs->total_sectors
caching only for certain block driver types, for which a size change is
expected: host_cdrom and host_floppy on POSIX, host_device on win32; also
the raw format in case it sits on top of one of these protocols, but in
the common case the nested bdrv_getlength() call on the protocol driver
will use the cache again and avoid an expensive drv->bdrv_getlength()
call.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 6 insertions, 3 deletions

diff --git a/block/raw-posix.c b/block/raw-posix.c
index 6f03fbf793..f6d48bbdb2 100644
--- a/block/raw-posix.c
+++ b/block/raw-posix.c
@@ -1715,7 +1715,8 @@ static BlockDriver bdrv_host_floppy = {
     .bdrv_aio_flush	= raw_aio_flush,
 
     .bdrv_truncate      = raw_truncate,
-    .bdrv_getlength	= raw_getlength,
+    .bdrv_getlength      = raw_getlength,
+    .has_variable_length = true,
     .bdrv_get_allocated_file_size
                         = raw_get_allocated_file_size,
 
@@ -1824,7 +1825,8 @@ static BlockDriver bdrv_host_cdrom = {
     .bdrv_aio_flush	= raw_aio_flush,
 
     .bdrv_truncate      = raw_truncate,
-    .bdrv_getlength     = raw_getlength,
+    .bdrv_getlength      = raw_getlength,
+    .has_variable_length = true,
     .bdrv_get_allocated_file_size
                         = raw_get_allocated_file_size,
 
@@ -1951,7 +1953,8 @@ static BlockDriver bdrv_host_cdrom = {
     .bdrv_aio_flush	= raw_aio_flush,
 
     .bdrv_truncate      = raw_truncate,
-    .bdrv_getlength     = raw_getlength,
+    .bdrv_getlength      = raw_getlength,
+    .has_variable_length = true,
     .bdrv_get_allocated_file_size
                         = raw_get_allocated_file_size,