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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 9a8c4cceaf)
This commit is contained in:
Kevin Wolf 2010-01-20 15:03:02 +01:00 committed by Anthony Liguori
parent d0d888bc6d
commit dbf45b44b7
1 changed files with 18 additions and 16 deletions
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34
block.c
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@ -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;
}