blk_get_max_transfer() works only with sg

[Tom Yan]

blk_get_max_transfer() is supposed to be able to get the max_sectors queue limit of the scsi device on the host side and is used in both scsi-generic.c (for scsi-generic and scsi-block) and scsi-disk.c (for scsi-hd) to set/change the max_xfer_len (and opt_xfer_len in the case of scsi-generic.c).

However, it only works with the sg driver in doing so. It cannot get the queue limit with the sd driver and simply returns MAX_INT.

qemu version 5.1.0
kernel version 5.8.5

Btw, is there a particular reason that it doesn't MIN_NON_ZERO against the original max_xfer_len: https://github.com/qemu/qemu/blob/v5.1.0/hw/scsi/scsi-generic.c#L172?

[Thomas Huth (th-huth)]

The QEMU project is currently moving its bug tracking to another system.
For this we need to know which bugs are still valid and which could be
closed already. Thus we are setting the bug state to "Incomplete" now.

If the bug has already been fixed in the latest upstream version of QEMU,
then please close this ticket as "Fix released".

If it is not fixed yet and you think that this bug report here is still
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1) If you already have an account on gitlab.com, please open a new ticket
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    https://gitlab.com/qemu-project/qemu/-/issues

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Thank you and sorry for the inconvenience.

[Launchpad Janitor (janitor)]

[Expired for QEMU because there has been no activity for 60 days.]