diff options
| author | Peter Lieven <pl@kamp.de> | 2014-10-27 10:18:45 +0100 |
|---|---|---|
| committer | Stefan Hajnoczi <stefanha@redhat.com> | 2014-11-03 09:48:41 +0000 |
| commit | 52f6fa1430209125d1c13fec7d6bbb501aedf322 (patch) | |
| tree | 0ea62c3d9ef921dd772ad70e89c1af09f361e7c3 /block/iscsi.c | |
| parent | 2647fab57d5d5e38b36f8dbda367d688045e6a2d (diff) | |
block/iscsi: set max_transfer_length
Copy the max_xfer_len from the BlockLimits VPD or use the
maximum value fitting in the CDB.
The helper function sector_limits_lun2qemu is introduced to convert
and cap the limits from the VPD to the maximum power of two fitting
in an integer; integer is the range for nb_sectors throughout
the block layer.
Signed-off-by: Peter Lieven <pl@kamp.de>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Diffstat (limited to 'block/iscsi.c')
| -rw-r--r-- | block/iscsi.c | 17 |
1 files changed, 15 insertions, 2 deletions
diff --git a/block/iscsi.c b/block/iscsi.c index 233f46285c..6b229b1427 100644 --- a/block/iscsi.c +++ b/block/iscsi.c @@ -1447,12 +1447,25 @@ static void iscsi_close(BlockDriverState *bs) memset(iscsilun, 0, sizeof(IscsiLun)); } -static void iscsi_refresh_limits(BlockDriverState *bs, Error **errp) +static int sector_limits_lun2qemu(int64_t sector, IscsiLun *iscsilun) { - IscsiLun *iscsilun = bs->opaque; + return MIN(sector_lun2qemu(sector, iscsilun), INT_MAX / 2 + 1); +} +static void iscsi_refresh_limits(BlockDriverState *bs, Error **errp) +{ /* We don't actually refresh here, but just return data queried in * iscsi_open(): iscsi targets don't change their limits. */ + + IscsiLun *iscsilun = bs->opaque; + uint32_t max_xfer_len = iscsilun->use_16_for_rw ? 0xffffffff : 0xffff; + + if (iscsilun->bl.max_xfer_len) { + max_xfer_len = MIN(max_xfer_len, iscsilun->bl.max_xfer_len); + } + + bs->bl.max_transfer_length = sector_limits_lun2qemu(max_xfer_len, iscsilun); + if (iscsilun->lbp.lbpu) { if (iscsilun->bl.max_unmap < 0xffffffff) { bs->bl.max_discard = sector_lun2qemu(iscsilun->bl.max_unmap, |