File 0223-block-Switch-blk_read_unthrottled-t.patch of Package qemu.5923

From 930b049f8cbd8554d3619b7fe83c3e71325b12ce Mon Sep 17 00:00:00 2001
From: Eric Blake <eblake@redhat.com>
Date: Fri, 6 May 2016 10:26:28 -0600
Subject: [PATCH] block: Switch blk_read_unthrottled() to byte interface

Sector-based blk_read() should die; convert the one-off
variant blk_read_unthrottled().

Signed-off-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
(cherry picked from commit b7d17f9fa4df83ed060168c450889d73c441c8f6)
[LM: BSC#1043176]
Signed-off-by: Lin Ma <lma@suse.com>
---
 block/block-backend.c          | 8 ++++----
 hw/block/hd-geometry.c         | 2 +-
 include/sysemu/block-backend.h | 4 ++--
 3 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/block/block-backend.c b/block/block-backend.c
index f43499622a..1dd7ec75b6 100644
--- a/block/block-backend.c
+++ b/block/block-backend.c
@@ -790,21 +790,21 @@ int blk_read(BlockBackend *blk, int64_t sector_num, uint8_t *buf,
     return blk_rw(blk, sector_num, buf, nb_sectors, blk_read_entry, 0);
 }
 
-int blk_read_unthrottled(BlockBackend *blk, int64_t sector_num, uint8_t *buf,
-                         int nb_sectors)
+int blk_pread_unthrottled(BlockBackend *blk, int64_t offset, uint8_t *buf,
+                          int count)
 {
     BlockDriverState *bs = blk_bs(blk);
     bool enabled;
     int ret;
 
-    ret = blk_check_request(blk, sector_num, nb_sectors);
+    ret = blk_check_byte_request(blk, offset, count);
     if (ret < 0) {
         return ret;
     }
 
     enabled = bs->io_limits_enabled;
     bs->io_limits_enabled = false;
-    ret = blk_read(blk, sector_num, buf, nb_sectors);
+    ret = blk_pread(blk, offset, buf, count);
     bs->io_limits_enabled = enabled;
     return ret;
 }
diff --git a/hw/block/hd-geometry.c b/hw/block/hd-geometry.c
index 6d02192dbb..d388f13e9d 100644
--- a/hw/block/hd-geometry.c
+++ b/hw/block/hd-geometry.c
@@ -66,7 +66,7 @@ static int guess_disk_lchs(BlockBackend *blk,
      * but also in async I/O mode. So the I/O throttling function has to
      * be disabled temporarily here, not permanently.
      */
-    if (blk_read_unthrottled(blk, 0, buf, 1) < 0) {
+    if (blk_pread_unthrottled(blk, 0, buf, BDRV_SECTOR_SIZE) < 0) {
         return -1;
     }
     /* test msdos magic */
diff --git a/include/sysemu/block-backend.h b/include/sysemu/block-backend.h
index bb33458f5f..ce7f9ee1cf 100644
--- a/include/sysemu/block-backend.h
+++ b/include/sysemu/block-backend.h
@@ -92,8 +92,8 @@ void *blk_get_attached_dev(BlockBackend *blk);
 void blk_set_dev_ops(BlockBackend *blk, const BlockDevOps *ops, void *opaque);
 int blk_read(BlockBackend *blk, int64_t sector_num, uint8_t *buf,
              int nb_sectors);
-int blk_read_unthrottled(BlockBackend *blk, int64_t sector_num, uint8_t *buf,
-                         int nb_sectors);
+int blk_pread_unthrottled(BlockBackend *blk, int64_t offset, uint8_t *buf,
+                          int count);
 int blk_write(BlockBackend *blk, int64_t sector_num, const uint8_t *buf,
               int nb_sectors);
 int blk_write_zeroes(BlockBackend *blk, int64_t sector_num,