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iscsi: Switch .bdrv_co_discard() to byte-based 

Another step towards killing off sector-based block APIs.

Unlike write_zeroes, where we can be handed unaligned requests
and must fail gracefully with -ENOTSUP for a fallback, we are
guaranteed that discard requests are always aligned because the
block layer already ignored unaligned head/tail.

Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 1468624988-423-13-git-send-email-eblake@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Eric Blake 2016-07-15 17:23:01 -06:00 committed by Stefan Hajnoczi
parent 1014170b82
commit 97c7e85cfe
1 changed files with 8 additions and 10 deletions
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18
block/iscsi.c
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@ -1042,29 +1042,26 @@ iscsi_getlength(BlockDriverState *bs)
}
static int
coroutine_fn iscsi_co_discard(BlockDriverState *bs, int64_t sector_num,
int nb_sectors)
coroutine_fn iscsi_co_pdiscard(BlockDriverState *bs, int64_t offset, int count)
{
IscsiLun *iscsilun = bs->opaque;
struct IscsiTask iTask;
struct unmap_list list;
if (!is_sector_request_lun_aligned(sector_num, nb_sectors, iscsilun)) {
return -EINVAL;
}
assert(is_byte_request_lun_aligned(offset, count, iscsilun));
if (!iscsilun->lbp.lbpu) {
/* UNMAP is not supported by the target */
return 0;
}
list.lba = sector_qemu2lun(sector_num, iscsilun);
list.num = sector_qemu2lun(nb_sectors, iscsilun);
list.lba = offset / iscsilun->block_size;
list.num = count / iscsilun->block_size;
iscsi_co_init_iscsitask(iscsilun, &iTask);
retry:
if (iscsi_unmap_task(iscsilun->iscsi, iscsilun->lun, 0, 0, &list, 1,
iscsi_co_generic_cb, &iTask) == NULL) {
iscsi_co_generic_cb, &iTask) == NULL) {
return -ENOMEM;
}
@ -1094,7 +1091,8 @@ retry:
return iTask.err_code;
}
iscsi_allocmap_set_invalid(iscsilun, sector_num, nb_sectors);
iscsi_allocmap_set_invalid(iscsilun, offset >> BDRV_SECTOR_BITS,
count >> BDRV_SECTOR_BITS);
return 0;
}
@ -1998,7 +1996,7 @@ static BlockDriver bdrv_iscsi = {
.bdrv_refresh_limits = iscsi_refresh_limits,
.bdrv_co_get_block_status = iscsi_co_get_block_status,
.bdrv_co_discard = iscsi_co_discard,
.bdrv_co_pdiscard = iscsi_co_pdiscard,
.bdrv_co_pwrite_zeroes = iscsi_co_pwrite_zeroes,
.bdrv_co_readv = iscsi_co_readv,
.bdrv_co_writev_flags = iscsi_co_writev_flags,