diff options
Diffstat (limited to 'block/iscsi.c')
| -rw-r--r-- | block/iscsi.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/block/iscsi.c b/block/iscsi.c index 93fee6d1df..75d6b875e4 100644 --- a/block/iscsi.c +++ b/block/iscsi.c @@ -1580,6 +1580,13 @@ static int iscsi_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) IscsiLun *iscsilun = bs->opaque; bdi->unallocated_blocks_are_zero = !!iscsilun->lbprz; bdi->can_write_zeroes_with_unmap = iscsilun->lbprz && iscsilun->lbp.lbpws; + /* Guess the internal cluster (page) size of the iscsi target by the means + * of opt_unmap_gran. Transfer the unmap granularity only if it has a + * reasonable size for bdi->cluster_size */ + if (iscsilun->bl.opt_unmap_gran * iscsilun->block_size >= 64 * 1024 && + iscsilun->bl.opt_unmap_gran * iscsilun->block_size <= 16 * 1024 * 1024) { + bdi->cluster_size = iscsilun->bl.opt_unmap_gran * iscsilun->block_size; + } return 0; } |