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mirror: limit niov to IOV_MAX elements, again

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During the refactor of mirror_iteration in e5b43573,
we regressed the fix introduced in cae98cb8.

This patch re-adds IOV_MAX checking to cases where we
aren't checking alignment (and size) already.

Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Message-id: 1466625064-11280-3-git-send-email-jsnow@redhat.com
Signed-off-by: Jeff Cody <jcody@redhat.com>
This commit is contained in:
John Snow 2016-06-22 15:51:03 -04:00 committed by Jeff Cody
parent 176129552f
commit e4808881cb
1 changed files with 3 additions and 0 deletions
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3
block/mirror.c
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@ -231,11 +231,14 @@ static int mirror_do_read(MirrorBlockJob *s, int64_t sector_num,
int sectors_per_chunk, nb_chunks;
int ret;
MirrorOp *op;
int max_sectors;
sectors_per_chunk = s->granularity >> BDRV_SECTOR_BITS;
max_sectors = sectors_per_chunk * s->max_iov;
/* We can only handle as much as buf_size at a time. */
nb_sectors = MIN(s->buf_size >> BDRV_SECTOR_BITS, nb_sectors);
nb_sectors = MIN(max_sectors, nb_sectors);
assert(nb_sectors);
ret = nb_sectors;