* [Qemu-devel] Virtual FAT disk images error, can somebody help me , thank you !
@ 2012-03-08 6:11 Zhi Hui Li
2012-03-08 8:30 ` Stefan Hajnoczi
2012-03-08 8:57 ` Mark Wu
0 siblings, 2 replies; 4+ messages in thread
From: Zhi Hui Li @ 2012-03-08 6:11 UTC (permalink / raw)
To: QEMU-devel, Stefan Hajnoczi, pingfanl
when I use the command :
1: mkdir /my_directory
2: qemu linux.img -fda fat:floppy:/my_directory
when I write to the floppy(just "mkdir test.dir" in the floppy), the
error occur:
"FLOPPY ERROR: fdctrl_transfer_handler: writing sector 1"
and nothing is written to the /my_directory.
I don't know why?
can you help me, thank you very much!
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [Qemu-devel] Virtual FAT disk images error, can somebody help me , thank you !
2012-03-08 6:11 [Qemu-devel] Virtual FAT disk images error, can somebody help me , thank you ! Zhi Hui Li
@ 2012-03-08 8:30 ` Stefan Hajnoczi
2012-03-08 8:57 ` Mark Wu
1 sibling, 0 replies; 4+ messages in thread
From: Stefan Hajnoczi @ 2012-03-08 8:30 UTC (permalink / raw)
To: Zhi Hui Li; +Cc: QEMU-devel, pingfanl
On Thu, Mar 08, 2012 at 02:11:33PM +0800, Zhi Hui Li wrote:
> when I use the command :
>
> 1: mkdir /my_directory
>
> 2: qemu linux.img -fda fat:floppy:/my_directory
>
> when I write to the floppy(just "mkdir test.dir" in the floppy),
> the error occur:
>
> "FLOPPY ERROR: fdctrl_transfer_handler: writing sector 1"
>
> and nothing is written to the /my_directory.
>
> I don't know why?
Although the error comes from hw/fdc.c code it's probably originates in
block/vvfat.c:vvfat_write(), because fdc.c is calling bdrv_write() and
reports an error if that function fails.
I suggest adding printfs or using gdb. The only two returns that have
no fprintf(stderr, ...) are:
/* Check if we're operating in read-only mode */
if (s->qcow == NULL) {
return -EACCES;
}
and
if (sector_num < s->first_sectors_number)
return -1;
Perhaps one of these is failing?
Stefan
^ permalink raw reply [flat|nested] 4+ messages in thread* Re: [Qemu-devel] Virtual FAT disk images error, can somebody help me , thank you !
2012-03-08 6:11 [Qemu-devel] Virtual FAT disk images error, can somebody help me , thank you ! Zhi Hui Li
2012-03-08 8:30 ` Stefan Hajnoczi
@ 2012-03-08 8:57 ` Mark Wu
2012-03-08 9:42 ` Stefan Hajnoczi
1 sibling, 1 reply; 4+ messages in thread
From: Mark Wu @ 2012-03-08 8:57 UTC (permalink / raw)
To: Zhi Hui Li; +Cc: QEMU-devel, pingfanl, Stefan Hajnoczi
On 03/08/2012 02:11 PM, Zhi Hui Li wrote:
>
>
> when I use the command :
>
> 1: mkdir /my_directory
>
> 2: qemu linux.img -fda fat:floppy:/my_directory
>
> when I write to the floppy(just "mkdir test.dir" in the floppy), the
> error occur:
>
> "FLOPPY ERROR: fdctrl_transfer_handler: writing sector 1"
>
> and nothing is written to the /my_directory.
>
> I don't know why?
>
>
> can you help me, thank you very much!
>
>
>
Zhi Hui,
You could try:
qemu linux.img -fda fat:floppy:rw:/my_directory
By default, it's only allow read-only access.
Mark
^ permalink raw reply [flat|nested] 4+ messages in thread* Re: [Qemu-devel] Virtual FAT disk images error, can somebody help me , thank you !
2012-03-08 8:57 ` Mark Wu
@ 2012-03-08 9:42 ` Stefan Hajnoczi
0 siblings, 0 replies; 4+ messages in thread
From: Stefan Hajnoczi @ 2012-03-08 9:42 UTC (permalink / raw)
To: Mark Wu; +Cc: Zhi Hui Li, QEMU-devel, pingfanl
On Thu, Mar 08, 2012 at 04:57:34PM +0800, Mark Wu wrote:
> On 03/08/2012 02:11 PM, Zhi Hui Li wrote:
> >
> >
> >when I use the command :
> >
> >1: mkdir /my_directory
> >
> >2: qemu linux.img -fda fat:floppy:/my_directory
> >
> >when I write to the floppy(just "mkdir test.dir" in the floppy),
> >the error occur:
> >
> >"FLOPPY ERROR: fdctrl_transfer_handler: writing sector 1"
> >
> >and nothing is written to the /my_directory.
> >
> >I don't know why?
> >
> >
> >can you help me, thank you very much!
> >
> >
> >
> Zhi Hui,
> You could try:
> qemu linux.img -fda fat:floppy:rw:/my_directory
>
> By default, it's only allow read-only access.
That explains it. Thanks Mark!
Stefan
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2012-03-08 9:42 UTC | newest]
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2012-03-08 6:11 [Qemu-devel] Virtual FAT disk images error, can somebody help me , thank you ! Zhi Hui Li
2012-03-08 8:30 ` Stefan Hajnoczi
2012-03-08 8:57 ` Mark Wu
2012-03-08 9:42 ` Stefan Hajnoczi
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