[PATCH 1/2] block: use bdrv_is_sg() helper instead of raw bs->sg reading

["Denis V. Lunev" <den@openvz.org>]

I believe that if the helper exists, it must be used always for reading
of the value. It breaks expectations in the other case.

Signed-off-by: Denis V. Lunev <den@openvz.org>
CC: Kevin Wolf <kwolf@redhat.com>
CC: Hanna Reitz <hreitz@redhat.com>
CC: Stefan Hajnoczi <stefanha@redhat.com>
CC: Fam Zheng <fam@euphon.net>
CC: Ronnie Sahlberg <ronniesahlberg@gmail.com>
CC: Paolo Bonzini <pbonzini@redhat.com>
CC: Peter Lieven <pl@kamp.de>
CC: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
---
 block/file-posix.c | 2 +-
 block/iscsi.c      | 2 +-
 block/raw-format.c | 4 ++--
 3 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/block/file-posix.c b/block/file-posix.c
index 48cd096624..256de1f456 100644
--- a/block/file-posix.c
+++ b/block/file-posix.c
@@ -1295,7 +1295,7 @@ static void raw_refresh_limits(BlockDriverState *bs, Error **errp)
     }
 #endif
 
-    if (bs->sg || S_ISBLK(st.st_mode)) {
+    if (bdrv_is_sg(bs) || S_ISBLK(st.st_mode)) {
         int ret = hdev_get_max_hw_transfer(s->fd, &st);
 
         if (ret > 0 && ret <= BDRV_REQUEST_MAX_BYTES) {
diff --git a/block/iscsi.c b/block/iscsi.c
index d707d0b354..612de127e5 100644
--- a/block/iscsi.c
+++ b/block/iscsi.c
@@ -2065,7 +2065,7 @@ static void iscsi_refresh_limits(BlockDriverState *bs, Error **errp)
     uint64_t max_xfer_len = iscsilun->use_16_for_rw ? 0xffffffff : 0xffff;
     unsigned int block_size = MAX(BDRV_SECTOR_SIZE, iscsilun->block_size);
 
-    assert(iscsilun->block_size >= BDRV_SECTOR_SIZE || bs->sg);
+    assert(iscsilun->block_size >= BDRV_SECTOR_SIZE || bdrv_is_sg(bs));
 
     bs->bl.request_alignment = block_size;
 
diff --git a/block/raw-format.c b/block/raw-format.c
index 69fd650eaf..c7278e348e 100644
--- a/block/raw-format.c
+++ b/block/raw-format.c
@@ -463,7 +463,7 @@ static int raw_open(BlockDriverState *bs, QDict *options, int flags,
         return -EINVAL;
     }
 
-    bs->sg = bs->file->bs->sg;
+    bs->sg = bdrv_is_sg(bs->file->bs);
     bs->supported_write_flags = BDRV_REQ_WRITE_UNCHANGED |
         (BDRV_REQ_FUA & bs->file->bs->supported_write_flags);
     bs->supported_zero_flags = BDRV_REQ_WRITE_UNCHANGED |
@@ -489,7 +489,7 @@ static int raw_open(BlockDriverState *bs, QDict *options, int flags,
         return ret;
     }
 
-    if (bs->sg && (s->offset || s->has_size)) {
+    if (bdrv_is_sg(bs) && (s->offset || s->has_size)) {
         error_setg(errp, "Cannot use offset/size with SCSI generic devices");
         return -EINVAL;
     }
-- 
2.32.0