* Re: [BusyBox] [Fwd: Loopback device setup?]
[not found] ` <40315E31.90201@san.rr.com>
@ 2004-02-17 8:22 ` vda
2004-02-17 17:00 ` Hugh Dickins
0 siblings, 1 reply; 3+ messages in thread
From: vda @ 2004-02-17 8:22 UTC (permalink / raw)
To: Tom Guilliams, DHollenbeck; +Cc: busybox, linux-kernel
On Tuesday 17 February 2004 02:20, Tom Guilliams wrote:
> in /driver/block/loop.c -
>
> loop_set_fd()
>
> /*
> * If we can't read - sorry. If we only can't write -
> * well, it's going to be read-only.
> */
> if (!aops->readpage)
> goto out_putf;
>
> I confirmed the "if (!aops->readpage)" is true. I'm not sure what the
> readpage routine is trying to do (which dev or file) in my command below -
> # mount -t ext2 -o loop ramdisk.image rootfs
>
> Anyone have any thoughts?? This is all being done in the /tmp
> dircectory which is mounted as "tmpfs". Not sure if that has anything
> to do with it.
I recall that tmpfs cannot do readpage (by design?).
CCing LKML, maybe someone will pour in more info.
--
vda
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [BusyBox] [Fwd: Loopback device setup?]
2004-02-17 8:22 ` [BusyBox] [Fwd: Loopback device setup?] vda
@ 2004-02-17 17:00 ` Hugh Dickins
2004-02-17 22:41 ` Tom Guilliams
0 siblings, 1 reply; 3+ messages in thread
From: Hugh Dickins @ 2004-02-17 17:00 UTC (permalink / raw)
To: vda; +Cc: Tom Guilliams, DHollenbeck, busybox, linux-kernel
On Tue, 17 Feb 2004, vda wrote:
> On Tuesday 17 February 2004 02:20, Tom Guilliams wrote:
> > in /driver/block/loop.c -
> >
> > loop_set_fd()
> >
> > /*
> > * If we can't read - sorry. If we only can't write -
> > * well, it's going to be read-only.
> > */
> > if (!aops->readpage)
> > goto out_putf;
> >
> > I confirmed the "if (!aops->readpage)" is true. I'm not sure what the
> > readpage routine is trying to do (which dev or file) in my command below -
> > # mount -t ext2 -o loop ramdisk.image rootfs
> >
> > Anyone have any thoughts?? This is all being done in the /tmp
> > dircectory which is mounted as "tmpfs". Not sure if that has anything
> > to do with it.
>
> I recall that tmpfs cannot do readpage (by design?).
> CCing LKML, maybe someone will pour in more info.
readpage is not straightforward for tmpfs, so it took a long time
to be added, but tmpfs has supported loop since 2.4.22 and 2.5.45.
Hugh
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [BusyBox] [Fwd: Loopback device setup?]
2004-02-17 17:00 ` Hugh Dickins
@ 2004-02-17 22:41 ` Tom Guilliams
0 siblings, 0 replies; 3+ messages in thread
From: Tom Guilliams @ 2004-02-17 22:41 UTC (permalink / raw)
To: Hugh Dickins; +Cc: vda, DHollenbeck, busybox, linux-kernel
Thanks to all who responded. I have a 2.4.20 kernel so mounting on the
tmpfs is not supported. I have found an alternative by using the ram
device nodes for storage.
Thanks again,
Tom
Hugh Dickins wrote:
> On Tue, 17 Feb 2004, vda wrote:
>
>>On Tuesday 17 February 2004 02:20, Tom Guilliams wrote:
>>
>>>in /driver/block/loop.c -
>>>
>>>loop_set_fd()
>>>
>>> /*
>>> * If we can't read - sorry. If we only can't write -
>>> * well, it's going to be read-only.
>>> */
>>> if (!aops->readpage)
>>> goto out_putf;
>>>
>>>I confirmed the "if (!aops->readpage)" is true. I'm not sure what the
>>>readpage routine is trying to do (which dev or file) in my command below -
>>># mount -t ext2 -o loop ramdisk.image rootfs
>>>
>>>Anyone have any thoughts?? This is all being done in the /tmp
>>>dircectory which is mounted as "tmpfs". Not sure if that has anything
>>>to do with it.
>>
>>I recall that tmpfs cannot do readpage (by design?).
>>CCing LKML, maybe someone will pour in more info.
>
>
> readpage is not straightforward for tmpfs, so it took a long time
> to be added, but tmpfs has supported loop since 2.4.22 and 2.5.45.
>
> Hugh
>
>
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2004-02-17 22:42 UTC | newest]
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[not found] ` <40315E31.90201@san.rr.com>
2004-02-17 8:22 ` [BusyBox] [Fwd: Loopback device setup?] vda
2004-02-17 17:00 ` Hugh Dickins
2004-02-17 22:41 ` Tom Guilliams
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