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iscsi: fix assertion in is_sector_request_lun_aligned

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Commit 94d047a added an assertion the the request alignment check.
This introduced 2 issues:
 a) A off-by-one error since a request of BDRV_REQUEST_MAX_SECTORS
    is actually allowed.
 b) The bdrv_get_block_status call in the read path to check the allocation
    status requests up to INT_MAX sectors which triggers the assertion.

Fixes: 94d047a35b
Signed-off-by: Peter Lieven <pl@kamp.de>
Message-Id: <1466414680-18383-1-git-send-email-pl@kamp.de>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Peter Lieven 2016-06-20 11:24:40 +02:00 committed by Paolo Bonzini
parent 8642c1b81e
commit 0ead93120e
1 changed files with 3 additions and 2 deletions
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5
block/iscsi.c
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@ -417,7 +417,7 @@ static bool is_byte_request_lun_aligned(int64_t offset, int count,
static bool is_sector_request_lun_aligned(int64_t sector_num, int nb_sectors,
IscsiLun *iscsilun)
{
assert(nb_sectors < BDRV_REQUEST_MAX_SECTORS);
assert(nb_sectors <= BDRV_REQUEST_MAX_SECTORS);
return is_byte_request_lun_aligned(sector_num << BDRV_SECTOR_BITS,
nb_sectors << BDRV_SECTOR_BITS,
iscsilun);
@ -661,7 +661,8 @@ static int coroutine_fn iscsi_co_readv(BlockDriverState *bs,
int64_t ret;
int pnum;
BlockDriverState *file;
ret = iscsi_co_get_block_status(bs, sector_num, INT_MAX, &pnum, &file);
ret = iscsi_co_get_block_status(bs, sector_num,
BDRV_REQUEST_MAX_SECTORS, &pnum, &file);
if (ret < 0) {
return ret;
}