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iscsi: remove support for misaligned nb_sectors in aio_readv

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this hask is not working (anymore). support for misaligned offsets should
be handled at the block layer.

Signed-off-by: Peter Lieven <pl@kamp.de>
Cc: qemu-stable@nongnu.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Peter Lieven 2013-07-11 14:16:26 +02:00 committed by Paolo Bonzini
parent d3bda7bc16
commit 7e4d5a9f94
1 changed files with 4 additions and 18 deletions
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22
block/iscsi.c
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@ -62,8 +62,6 @@ typedef struct IscsiAIOCB {
int status;
int canceled;
int retries;
size_t read_size;
size_t read_offset;
int64_t sector_num;
int nb_sectors;
#ifdef __linux__
@ -380,6 +378,7 @@ static int
iscsi_aio_readv_acb(IscsiAIOCB *acb)
{
struct iscsi_context *iscsi = acb->iscsilun->iscsi;
size_t size;
uint64_t lba;
uint32_t num_sectors;
int ret;
@ -392,20 +391,7 @@ iscsi_aio_readv_acb(IscsiAIOCB *acb)
acb->status = -EINPROGRESS;
acb->buf = NULL;
/* If LUN blocksize is bigger than BDRV_BLOCK_SIZE a read from QEMU
* may be misaligned to the LUN, so we may need to read some extra
* data.
*/
acb->read_offset = 0;
if (acb->iscsilun->block_size > BDRV_SECTOR_SIZE) {
uint64_t bdrv_offset = BDRV_SECTOR_SIZE * acb->sector_num;
acb->read_offset = bdrv_offset % acb->iscsilun->block_size;
}
num_sectors = (acb->read_size + acb->iscsilun->block_size
+ acb->read_offset - 1)
/ acb->iscsilun->block_size;
size = acb->nb_sectors * BDRV_SECTOR_SIZE;
acb->task = malloc(sizeof(struct scsi_task));
if (acb->task == NULL) {
@ -416,8 +402,9 @@ iscsi_aio_readv_acb(IscsiAIOCB *acb)
memset(acb->task, 0, sizeof(struct scsi_task));
acb->task->xfer_dir = SCSI_XFER_READ;
acb->task->expxferlen = size;
lba = sector_qemu2lun(acb->sector_num, acb->iscsilun);
acb->task->expxferlen = acb->read_size;
num_sectors = sector_qemu2lun(acb->nb_sectors, acb->iscsilun);
switch (acb->iscsilun->type) {
case TYPE_DISK:
@ -472,7 +459,6 @@ iscsi_aio_readv(BlockDriverState *bs, int64_t sector_num,
acb->sector_num = sector_num;
acb->iscsilun = iscsilun;
acb->qiov = qiov;
acb->read_size = BDRV_SECTOR_SIZE * (size_t)acb->nb_sectors;
acb->retries = ISCSI_CMD_RETRIES;
if (iscsi_aio_readv_acb(acb) != 0) {