BLKDISCARD and AIO

BLKDISCARD and AIO

[Menny Hamburger]

Hi,

I have a question regarding the use of BLKDISCARD ioctl in userland code:
Is there currently a way to hook up with an asyncronous event that can be polled by userland when the operation completes?
If not, is there any developement undergoing to implement such a behavior? 

Thanks,
Menny

Re: BLKDISCARD and AIO

[Martin K. Petersen]

>>>>> "Menny" == Menny Hamburger <Menny_Hamburger@Dell.com> writes:

Menny> I have a question regarding the use of BLKDISCARD ioctl in
Menny> userland code: Is there currently a way to hook up with an
Menny> asyncronous event that can be polled by userland when the
Menny> operation completes? 

Not at this time, no.

However, you can fork a child process to execute the ioctl and wait for
that to complete.

-- 
Martin K. Petersen	Oracle Linux Engineering

RE: BLKDISCARD and AIO

[Menny_Hamburger]

Dell - Internal Use - Confidential 

Thanks,

The issue is that we run a single threaded process (we maintain our own threads) and use eventfd to driver both networking and AIO, so blocking on BLKDISCARD will block all IO done by the process.

Menny



-----Original Message-----
From: Martin K. Petersen [mailto:martin.petersen@oracle.com]
Sent: Wednesday, October 23, 2013 11:43 AM
To: Hamburger, Menny
Cc: linux-scsi@vger.kernel.org
Subject: Re: BLKDISCARD and AIO 
>>>>> "Menny" == Menny Hamburger <Menny_Hamburger@Dell.com> writes: 
Menny> I have a question regarding the use of BLKDISCARD ioctl in 
Menny> userland code: Is there currently a way to hook up with an 
Menny> asyncronous event that can be polled by userland when the 
Menny> operation completes?
Not at this time, no. 
However, you can fork a child process to execute the ioctl and wait for that to complete. 
--
Martin K. Petersen      Oracle Linux Engineering 
--
To unsubscribe from this list: send the line "unsubscribe linux-scsi" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html