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iscsi: add bdrv_co_write_zeroes

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Signed-off-by: Peter Lieven <pl@kamp.de>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Peter Lieven 2013-10-24 12:07:02 +02:00 committed by Kevin Wolf
parent 01a6a238a3
commit d4cd961507
1 changed files with 64 additions and 0 deletions
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64
block/iscsi.c
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@ -56,6 +56,7 @@ typedef struct IscsiLun {
uint8_t lbprz;
struct scsi_inquiry_logical_block_provisioning lbp;
struct scsi_inquiry_block_limits bl;
unsigned char *zeroblock;
} IscsiLun;
typedef struct IscsiTask {
@ -959,6 +960,65 @@ retry:
return 0;
}
#if defined(SCSI_SENSE_ASCQ_CAPACITY_DATA_HAS_CHANGED)
static int
coroutine_fn iscsi_co_write_zeroes(BlockDriverState *bs, int64_t sector_num,
int nb_sectors, BdrvRequestFlags flags)
{
IscsiLun *iscsilun = bs->opaque;
struct IscsiTask iTask;
uint64_t lba;
uint32_t nb_blocks;
if (!is_request_lun_aligned(sector_num, nb_sectors, iscsilun)) {
return -EINVAL;
}
if (!iscsilun->lbp.lbpws) {
/* WRITE SAME is not supported by the target */
return -ENOTSUP;
}
lba = sector_qemu2lun(sector_num, iscsilun);
nb_blocks = sector_qemu2lun(nb_sectors, iscsilun);
if (iscsilun->zeroblock == NULL) {
iscsilun->zeroblock = g_malloc0(iscsilun->block_size);
}
iscsi_co_init_iscsitask(iscsilun, &iTask);
retry:
if (iscsi_writesame16_task(iscsilun->iscsi, iscsilun->lun, lba,
iscsilun->zeroblock, iscsilun->block_size,
nb_blocks, 0, !!(flags & BDRV_REQ_MAY_UNMAP),
0, 0, iscsi_co_generic_cb, &iTask) == NULL) {
return -EIO;
}
while (!iTask.complete) {
iscsi_set_events(iscsilun);
qemu_coroutine_yield();
}
if (iTask.task != NULL) {
scsi_free_scsi_task(iTask.task);
iTask.task = NULL;
}
if (iTask.do_retry) {
goto retry;
}
if (iTask.status != SCSI_STATUS_GOOD) {
return -EIO;
}
return 0;
}
#endif /* SCSI_SENSE_ASCQ_CAPACITY_DATA_HAS_CHANGED */
static int parse_chap(struct iscsi_context *iscsi, const char *target)
{
QemuOptsList *list;
@ -1421,6 +1481,7 @@ static void iscsi_close(BlockDriverState *bs)
}
qemu_aio_set_fd_handler(iscsi_get_fd(iscsi), NULL, NULL, NULL);
iscsi_destroy_context(iscsi);
g_free(iscsilun->zeroblock);
memset(iscsilun, 0, sizeof(IscsiLun));
}
@ -1539,6 +1600,9 @@ static BlockDriver bdrv_iscsi = {
.bdrv_co_get_block_status = iscsi_co_get_block_status,
#endif
.bdrv_co_discard = iscsi_co_discard,
#if defined(SCSI_SENSE_ASCQ_CAPACITY_DATA_HAS_CHANGED)
.bdrv_co_write_zeroes = iscsi_co_write_zeroes,
#endif
.bdrv_aio_readv = iscsi_aio_readv,
.bdrv_aio_writev = iscsi_aio_writev,