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From 47601d6fd4a620799984340c1fd44ff472f9d824 Mon Sep 17 00:00:00 2001
Message-Id: <47601d6fd4a620799984340c1fd44ff472f9d824.1418766606.git.jen@redhat.com>
In-Reply-To: <6f81b4847eb68ebdf54a8f1a771e19d112d74152.1418766606.git.jen@redhat.com>
References: <6f81b4847eb68ebdf54a8f1a771e19d112d74152.1418766606.git.jen@redhat.com>
From: Fam Zheng <famz@redhat.com>
Date: Thu, 4 Dec 2014 00:05:18 -0600
Subject: [CHANGE 24/31] block: New bdrv_nb_sectors()
To: rhvirt-patches@redhat.com,
jen@redhat.com
RH-Author: Fam Zheng <famz@redhat.com>
Message-id: <1417651524-18041-25-git-send-email-famz@redhat.com>
Patchwork-id: 62697
O-Subject: [RHEL-7.1 qemu-kvm PATCH v5 24/30] block: New bdrv_nb_sectors()
Bugzilla: 1002493
RH-Acked-by: Jeffrey Cody <jcody@redhat.com>
RH-Acked-by: Markus Armbruster <armbru@redhat.com>
RH-Acked-by: Max Reitz <mreitz@redhat.com>
From: Markus Armbruster <armbru@redhat.com>
A call to retrieve the image size converts between bytes and sectors
several times:
* BlockDriver method bdrv_getlength() returns bytes.
* refresh_total_sectors() converts to sectors, rounding up, and stores
in total_sectors.
* bdrv_getlength() converts total_sectors back to bytes (now rounded
up to a multiple of the sector size).
* Callers wanting sectors rather bytes convert it right back.
Example: bdrv_get_geometry().
bdrv_nb_sectors() provides a way to omit the last two conversions.
It's exactly bdrv_getlength() with the conversion to bytes omitted.
It's functionally like bdrv_get_geometry() without its odd error
handling.
Reimplement bdrv_getlength() and bdrv_get_geometry() on top of
bdrv_nb_sectors().
The next patches will convert some users of bdrv_getlength() to
bdrv_nb_sectors().
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Benoit Canet <benoit@irqsave.net>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
(cherry picked from commit 65a9bb25d6b7a4bb41edb102fa0363d81800b417)
Signed-off-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Jeff E. Nelson <jen@redhat.com>
---
block.c | 29 +++++++++++++++++++----------
include/block/block.h | 1 +
2 files changed, 20 insertions(+), 10 deletions(-)
diff --git a/block.c b/block.c
index d7b6376..21418a6 100644
--- a/block.c
+++ b/block.c
@@ -647,6 +647,7 @@ static int find_image_format(BlockDriverState *bs, const char *filename,
/**
* Set the current 'total_sectors' value
+ * Return 0 on success, -errno on error.
*/
static int refresh_total_sectors(BlockDriverState *bs, int64_t hint)
{
@@ -3255,11 +3256,12 @@ int64_t bdrv_get_allocated_file_size(BlockDriverState *bs)
}
/**
- * Length of a file in bytes. Return < 0 if error or unknown.
+ * Return number of sectors on success, -errno on error.
*/
-int64_t bdrv_getlength(BlockDriverState *bs)
+int64_t bdrv_nb_sectors(BlockDriverState *bs)
{
BlockDriver *drv = bs->drv;
+
if (!drv)
return -ENOMEDIUM;
@@ -3269,19 +3271,26 @@ int64_t bdrv_getlength(BlockDriverState *bs)
return ret;
}
}
- return bs->total_sectors * BDRV_SECTOR_SIZE;
+ return bs->total_sectors;
+}
+
+/**
+ * Return length in bytes on success, -errno on error.
+ * The length is always a multiple of BDRV_SECTOR_SIZE.
+ */
+int64_t bdrv_getlength(BlockDriverState *bs)
+{
+ int64_t ret = bdrv_nb_sectors(bs);
+
+ return ret < 0 ? ret : ret * BDRV_SECTOR_SIZE;
}
/* return 0 as number of sectors if no device present or error */
void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr)
{
- int64_t length;
- length = bdrv_getlength(bs);
- if (length < 0)
- length = 0;
- else
- length = length >> BDRV_SECTOR_BITS;
- *nb_sectors_ptr = length;
+ int64_t nb_sectors = bdrv_nb_sectors(bs);
+
+ *nb_sectors_ptr = nb_sectors < 0 ? 0 : nb_sectors;
}
/* throttling disk io limits */
diff --git a/include/block/block.h b/include/block/block.h
index b06a9dc..c79a1e1 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -250,6 +250,7 @@ BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs,
const char *backing_file);
int bdrv_get_backing_file_depth(BlockDriverState *bs);
int bdrv_truncate(BlockDriverState *bs, int64_t offset);
+int64_t bdrv_nb_sectors(BlockDriverState *bs);
int64_t bdrv_getlength(BlockDriverState *bs);
int64_t bdrv_get_allocated_file_size(BlockDriverState *bs);
void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr);
--
2.1.0