Re: Grant

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Re: Grant

2018-06-20 Thread Maratovich M. Fridman
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[PATCH 3/6] esp_scsi: Grant disconnect privilege for untagged commands

2018-10-12 Thread Finn Thain
A SCSI device is not granted disconnect privilege by an esp_scsi host unless that device has its simple_tags flag set. However, a device may support disconnect/reselect and not support command queueing. Allow these devices to disconnect and improve bus utilization. Tested-by: Stan Johnson Signed-

[PATCH v2 3/6] esp_scsi: Grant disconnect privilege for untagged commands

2018-10-13 Thread Finn Thain
A SCSI device is not granted disconnect privilege by an esp_scsi host unless that device has its simple_tags flag set. However, a device may support disconnect/reselect and not support command queueing. Allow these devices to disconnect and improve bus utilization. Tested-by: Stan Johnson Signed-

[PATCH v3 3/6] esp_scsi: Grant disconnect privilege for untagged commands

2018-10-15 Thread Finn Thain
A SCSI device is not granted disconnect privilege by an esp_scsi host unless that device has its simple_tags flag set. However, a device may support disconnect/reselect and not support command queueing. Allow such devices to disconnect and thereby improve bus utilization. Drop the redundant 'lp' c

[linux-scsi] How to solve the delayed grant mapping problem with blkback?

2017-03-17 Thread Xieyingtai
Hello, Recently I got a problem when I use virtual machines in Xen virtualization, description just as follws. Grant table and grant mapping were used for data communication with in Xen front end driver and back end driver. A delay work will be set up to release grant mapping pages in

Re: [PATCH v2 3/6] esp_scsi: Grant disconnect privilege for untagged commands

2018-10-14 Thread Christoph Hellwig
> + *p++ = IDENTIFY(lp && (tp->flags & ESP_TGT_DISCONNECT), lun); I think lp should always be non-NULL here.

Re: [PATCH v2 3/6] esp_scsi: Grant disconnect privilege for untagged commands

2018-10-14 Thread Michael Schmitz
On 15/10/18 04:47, Christoph Hellwig wrote: + *p++ = IDENTIFY(lp && (tp->flags & ESP_TGT_DISCONNECT), lun); I think lp should always be non-NULL here. That indeed appears to be the case these days. So we can't rely on !lp to detect when probing the bus any longer. What else would be a

Re: [PATCH v2 3/6] esp_scsi: Grant disconnect privilege for untagged commands

2018-10-14 Thread Finn Thain
On Mon, 15 Oct 2018, Michael Schmitz wrote: > > Do we really need to make that distinction? > esp_reconnect() dereferences lp, so !lp has to inhibit disconnection. At least, that's my reading. I can't see any other reason for the lp conditional. --

Re: [PATCH v2 3/6] esp_scsi: Grant disconnect privilege for untagged commands

2018-10-14 Thread Finn Thain
On Sun, 14 Oct 2018, Christoph Hellwig wrote: > > + *p++ = IDENTIFY(lp && (tp->flags & ESP_TGT_DISCONNECT), lun); > > I think lp should always be non-NULL here. > It's not clear from Documentation/scsi/scsi_mid_low_api.txt, but I guess that's true for scanning of targets. Is it true in gene

Re: [PATCH v2 3/6] esp_scsi: Grant disconnect privilege for untagged commands

2018-10-14 Thread Finn Thain
On Mon, 15 Oct 2018, Finn Thain wrote: > On Sun, 14 Oct 2018, Christoph Hellwig wrote: > > > > + *p++ = IDENTIFY(lp && (tp->flags & ESP_TGT_DISCONNECT), lun); > > > > I think lp should always be non-NULL here. > > > > It's not clear from Documentation/scsi/scsi_mid_low_api.txt, but I guess >

Re: [PATCH v2 3/6] esp_scsi: Grant disconnect privilege for untagged commands

2018-10-14 Thread Christoph Hellwig
On Mon, Oct 15, 2018 at 10:13:37AM +1100, Finn Thain wrote: > On Sun, 14 Oct 2018, Christoph Hellwig wrote: > > > > + *p++ = IDENTIFY(lp && (tp->flags & ESP_TGT_DISCONNECT), lun); > > > > I think lp should always be non-NULL here. > > > > It's not clear from Documentation/scsi/scsi_mid_low_api.

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2014-02-11 Thread kadri karim
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