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iscsi: assert that sectors are aligned to LUN blocksize 

if the blocksize of an iSCSI LUN is bigger than the BDRV_SECTOR_SIZE
it is possible that sector_num or nb_sectors are not correctly
aligned.

to avoid corruption we fail requests which are misaligned.

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 14:16:27 +02:00 committed by Paolo Bonzini
parent 7e4d5a9f94
commit 91bea4e2bb
1 changed files with 20 additions and 0 deletions
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20
block/iscsi.c
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@ -237,6 +237,18 @@ static int64_t sector_qemu2lun(int64_t sector, IscsiLun *iscsilun)
return sector * BDRV_SECTOR_SIZE / iscsilun->block_size;
}
static bool is_request_lun_aligned(int64_t sector_num, int nb_sectors,
IscsiLun *iscsilun)
{
if ((sector_num * BDRV_SECTOR_SIZE) % iscsilun->block_size ||
(nb_sectors * BDRV_SECTOR_SIZE) % iscsilun->block_size) {
error_report("iSCSI misaligned request: iscsilun->block_size %u, sector_num %ld, nb_sectors %d",
iscsilun->block_size, sector_num, nb_sectors);
return 0;
}
return 1;
}
static int
iscsi_aio_writev_acb(IscsiAIOCB *acb)
{
@ -321,6 +333,10 @@ iscsi_aio_writev(BlockDriverState *bs, int64_t sector_num,
IscsiLun *iscsilun = bs->opaque;
IscsiAIOCB *acb;
if (!is_request_lun_aligned(sector_num, nb_sectors, iscsilun)) {
return NULL;
}
acb = qemu_aio_get(&iscsi_aiocb_info, bs, cb, opaque);
trace_iscsi_aio_writev(iscsilun->iscsi, sector_num, nb_sectors, opaque, acb);
@ -452,6 +468,10 @@ iscsi_aio_readv(BlockDriverState *bs, int64_t sector_num,
IscsiLun *iscsilun = bs->opaque;
IscsiAIOCB *acb;
if (!is_request_lun_aligned(sector_num, nb_sectors, iscsilun)) {
return NULL;
}
acb = qemu_aio_get(&iscsi_aiocb_info, bs, cb, opaque);
trace_iscsi_aio_readv(iscsilun->iscsi, sector_num, nb_sectors, opaque, acb);