block: Return original error codes in bdrv_pread/write

Don't assume -EIO but return the real error.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
(cherry picked from commit 9a8c4cceaf670193270995b95378faa3867db999)

diff --git a/block.c b/block.c
index a3163a723e43c0be6cb11861f2aba44367a5dfb1..97af3f57703a01603fdbb996a38d73e907b0bdba 100644 (file)
--- a/block.c
+++ b/block.c
@@ -691,6 +691,7 @@ int bdrv_pread(BlockDriverState *bs, int64_t offset,
     uint8_t tmp_buf[BDRV_SECTOR_SIZE];
     int len, nb_sectors, count;
     int64_t sector_num;
+    int ret;
 
     count = count1;
     /* first read to align to sector start */
@@ -699,8 +700,8 @@ int bdrv_pread(BlockDriverState *bs, int64_t offset,
         len = count;
     sector_num = offset >> BDRV_SECTOR_BITS;
     if (len > 0) {
-        if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0)
-            return -EIO;
+        if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0)
+            return ret;
         memcpy(buf, tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), len);
         count -= len;
         if (count == 0)
@@ -712,8 +713,8 @@ int bdrv_pread(BlockDriverState *bs, int64_t offset,
     /* read the sectors "in place" */
     nb_sectors = count >> BDRV_SECTOR_BITS;
     if (nb_sectors > 0) {
-        if (bdrv_read(bs, sector_num, buf, nb_sectors) < 0)
-            return -EIO;
+        if ((ret = bdrv_read(bs, sector_num, buf, nb_sectors)) < 0)
+            return ret;
         sector_num += nb_sectors;
         len = nb_sectors << BDRV_SECTOR_BITS;
         buf += len;
@@ -722,8 +723,8 @@ int bdrv_pread(BlockDriverState *bs, int64_t offset,
 
     /* add data from the last sector */
     if (count > 0) {
-        if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0)
-            return -EIO;
+        if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0)
+            return ret;
         memcpy(buf, tmp_buf, count);
     }
     return count1;
@@ -735,6 +736,7 @@ int bdrv_pwrite(BlockDriverState *bs, int64_t offset,
     uint8_t tmp_buf[BDRV_SECTOR_SIZE];
     int len, nb_sectors, count;
     int64_t sector_num;
+    int ret;
 
     count = count1;
     /* first write to align to sector start */
@@ -743,11 +745,11 @@ int bdrv_pwrite(BlockDriverState *bs, int64_t offset,
         len = count;
     sector_num = offset >> BDRV_SECTOR_BITS;
     if (len > 0) {
-        if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0)
-            return -EIO;
+        if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0)
+            return ret;
         memcpy(tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), buf, len);
-        if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0)
-            return -EIO;
+        if ((ret = bdrv_write(bs, sector_num, tmp_buf, 1)) < 0)
+            return ret;
         count -= len;
         if (count == 0)
             return count1;
@@ -758,8 +760,8 @@ int bdrv_pwrite(BlockDriverState *bs, int64_t offset,
     /* write the sectors "in place" */
     nb_sectors = count >> BDRV_SECTOR_BITS;
     if (nb_sectors > 0) {
-        if (bdrv_write(bs, sector_num, buf, nb_sectors) < 0)
-            return -EIO;
+        if ((ret = bdrv_write(bs, sector_num, buf, nb_sectors)) < 0)
+            return ret;
         sector_num += nb_sectors;
         len = nb_sectors << BDRV_SECTOR_BITS;
         buf += len;
@@ -768,11 +770,11 @@ int bdrv_pwrite(BlockDriverState *bs, int64_t offset,
 
     /* add data from the last sector */
     if (count > 0) {
-        if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0)
-            return -EIO;
+        if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0)
+            return ret;
         memcpy(tmp_buf, buf, count);
-        if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0)
-            return -EIO;
+        if ((ret = bdrv_write(bs, sector_num, tmp_buf, 1)) < 0)
+            return ret;
     }
     return count1;
 }