* [9fans] ipaq / flash filesystem question
@ 2003-11-06 16:56 steve-simon
2003-11-06 17:15 ` David Presotto
0 siblings, 1 reply; 6+ messages in thread
From: steve-simon @ 2003-11-06 16:56 UTC (permalink / raw)
To: 9fans
Hi,
I understand the iPaq uses a flash filesystem as its backing store
but from a cursory glance at the source indicates this is prepared
on another plan9 box and downloaded as a memory image - maybe this
is just for bootstrapping?
My question is: can the plan9 flash filesystem read and write files?
and seccondly does it know about wear leveling?
If so I shall be re-reading the Licience to see if I can use it for
a product proposal...:-)
-Steve
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [9fans] ipaq / flash filesystem question
2003-11-06 16:56 [9fans] ipaq / flash filesystem question steve-simon
@ 2003-11-06 17:15 ` David Presotto
2003-11-06 17:22 ` David Presotto
` (2 more replies)
0 siblings, 3 replies; 6+ messages in thread
From: David Presotto @ 2003-11-06 17:15 UTC (permalink / raw)
To: 9fans
there are 2 different file systems. One is the read only one you
mentioned. The other is a log structured one that brucee wrote
that is r/w and really well suited for flash, called brzr. I thought
there was a man page for it but I can't find it.
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [9fans] ipaq / flash filesystem question
2003-11-06 17:15 ` David Presotto
@ 2003-11-06 17:22 ` David Presotto
2003-11-06 18:01 ` C H Forsyth
2003-11-06 19:08 ` Bruce Ellis
2 siblings, 0 replies; 6+ messages in thread
From: David Presotto @ 2003-11-06 17:22 UTC (permalink / raw)
To: 9fans
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Look /sys/src/cmd/cmd/aux/flashfs for the flash r/w file system.
I'll build a man page if I can't find one.
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From: David Presotto <presotto@closedmind.org>
To: 9fans@cse.psu.edu
Subject: Re: [9fans] ipaq / flash filesystem question
Date: Thu, 6 Nov 2003 12:15:02 -0500
Message-ID: <51426fcb577bc037da9c57d968de2f0a@plan9.bell-labs.com>
there are 2 different file systems. One is the read only one you
mentioned. The other is a log structured one that brucee wrote
that is r/w and really well suited for flash, called brzr. I thought
there was a man page for it but I can't find it.
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [9fans] ipaq / flash filesystem question
2003-11-06 17:15 ` David Presotto
2003-11-06 17:22 ` David Presotto
@ 2003-11-06 18:01 ` C H Forsyth
2003-11-06 18:05 ` Charles Forsyth
2003-11-06 19:08 ` Bruce Ellis
2 siblings, 1 reply; 6+ messages in thread
From: C H Forsyth @ 2003-11-06 18:01 UTC (permalink / raw)
To: 9fans
>>that is r/w and really well suited for flash, called brzr. I thought
it's good code. it's better for NOR flash;
for NAND it's not so clear cut, although
if you're happy with the resulting trade-offs,
a buffering NAND driver might get you going.
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [9fans] ipaq / flash filesystem question
2003-11-06 18:01 ` C H Forsyth
@ 2003-11-06 18:05 ` Charles Forsyth
0 siblings, 0 replies; 6+ messages in thread
From: Charles Forsyth @ 2003-11-06 18:05 UTC (permalink / raw)
To: 9fans
>>it's good code.
by which i mean that it's well worth reading even
if you never intend to flash
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [9fans] ipaq / flash filesystem question
2003-11-06 17:15 ` David Presotto
2003-11-06 17:22 ` David Presotto
2003-11-06 18:01 ` C H Forsyth
@ 2003-11-06 19:08 ` Bruce Ellis
2 siblings, 0 replies; 6+ messages in thread
From: Bruce Ellis @ 2003-11-06 19:08 UTC (permalink / raw)
To: 9fans
i'm not totally to blame, the design is presotto's - simple enough
to be explained to me over first coffee of the day. the limbo
version has been used solidly for two years and has a few
enhancements / bug fixes. it's mild on the flash but *please
don't use it for log files*. i'll update the C version if it is in use.
brucee
----- Original Message -----
From: "David Presotto" <presotto@closedmind.org>
To: <9fans@cse.psu.edu>
Sent: Friday, November 07, 2003 4:15 AM
Subject: Re: [9fans] ipaq / flash filesystem question
> there are 2 different file systems. One is the read only one you
> mentioned. The other is a log structured one that brucee wrote
> that is r/w and really well suited for flash, called brzr. I thought
> there was a man page for it but I can't find it.
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2003-11-06 19:08 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
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2003-11-06 16:56 [9fans] ipaq / flash filesystem question steve-simon
2003-11-06 17:15 ` David Presotto
2003-11-06 17:22 ` David Presotto
2003-11-06 18:01 ` C H Forsyth
2003-11-06 18:05 ` Charles Forsyth
2003-11-06 19:08 ` Bruce Ellis
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