* open command fails in UBIFS when pass O_DIRECT Flag
@ 2009-07-14 14:25 naveen yadav
2009-07-15 8:05 ` Adrian Hunter
0 siblings, 1 reply; 4+ messages in thread
From: naveen yadav @ 2009-07-14 14:25 UTC (permalink / raw)
To: Linux-MTD Mailing List
Hi all,
I am using UBIFS file system, and i am able to read/write.
But when i use O_DIRECT flag it fails in open command. will you pls
let me know is it issue with UBIFS.
If i use jffs2 or other file system there is no problem.
Here is my test program
#define _GNU_SOURCE
#include <stdio.h>
#include <fcntl.h>
#include <sys/stat.h>
int main()
{
int w_fd=0;
if ((w_fd = open("temp.tmp", O_RDWR | O_CREAT |O_DIRECT , 0666)) < 0)
{
perror("fopen");
return 0;
}
}
Best Regards
Naveen
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: open command fails in UBIFS when pass O_DIRECT Flag
2009-07-14 14:25 open command fails in UBIFS when pass O_DIRECT Flag naveen yadav
@ 2009-07-15 8:05 ` Adrian Hunter
2009-07-15 19:27 ` Jon Fraser
0 siblings, 1 reply; 4+ messages in thread
From: Adrian Hunter @ 2009-07-15 8:05 UTC (permalink / raw)
To: naveen yadav; +Cc: Linux-MTD Mailing List
naveen yadav wrote:
> I am using UBIFS file system, and i am able to read/write.
> But when i use O_DIRECT flag it fails in open command. will you pls
> let me know is it issue with UBIFS.
UBIFS does not support direct I/O, sorry.
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: open command fails in UBIFS when pass O_DIRECT Flag
2009-07-15 8:05 ` Adrian Hunter
@ 2009-07-15 19:27 ` Jon Fraser
2009-07-16 5:55 ` Adrian Hunter
0 siblings, 1 reply; 4+ messages in thread
From: Jon Fraser @ 2009-07-15 19:27 UTC (permalink / raw)
To: Adrian Hunter; +Cc: jfraser, Linux-MTD Mailing List, naveen yadav
Is this planned for the future?
Is there any technical reason that prevents implementing direct IO?
Jon Fraser
Broadcom
On Wed, 2009-07-15 at 01:05 -0700, Adrian Hunter wrote:
> naveen yadav wrote:
> > I am using UBIFS file system, and i am able to read/write.
> > But when i use O_DIRECT flag it fails in open command. will you pls
> > let me know is it issue with UBIFS.
>
> UBIFS does not support direct I/O, sorry.
>
> ______________________________________________________
> Linux MTD discussion mailing list
> http://lists.infradead.org/mailman/listinfo/linux-mtd/
>
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: open command fails in UBIFS when pass O_DIRECT Flag
2009-07-15 19:27 ` Jon Fraser
@ 2009-07-16 5:55 ` Adrian Hunter
0 siblings, 0 replies; 4+ messages in thread
From: Adrian Hunter @ 2009-07-16 5:55 UTC (permalink / raw)
To: jfraser@broadcom.com; +Cc: Linux-MTD Mailing List, naveen yadav
Jon Fraser wrote:
> Is this planned for the future?
Not at the moment.
> Is there any technical reason that prevents implementing direct IO?
Not that I can think of. But memory mapping is probably better and
that is supported.
>
> Jon Fraser
> Broadcom
>
> On Wed, 2009-07-15 at 01:05 -0700, Adrian Hunter wrote:
>> naveen yadav wrote:
>>> I am using UBIFS file system, and i am able to read/write.
>>> But when i use O_DIRECT flag it fails in open command. will you pls
>>> let me know is it issue with UBIFS.
>> UBIFS does not support direct I/O, sorry.
>>
>> ______________________________________________________
>> Linux MTD discussion mailing list
>> http://lists.infradead.org/mailman/listinfo/linux-mtd/
>>
>
>
>
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2009-07-16 5:54 UTC | newest]
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2009-07-14 14:25 open command fails in UBIFS when pass O_DIRECT Flag naveen yadav
2009-07-15 8:05 ` Adrian Hunter
2009-07-15 19:27 ` Jon Fraser
2009-07-16 5:55 ` Adrian Hunter
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