* File system implementation
@ 2013-05-25 5:17 Dibyayan Chakraborty
2013-05-26 11:39 ` Greg Freemyer
` (2 more replies)
0 siblings, 3 replies; 6+ messages in thread
From: Dibyayan Chakraborty @ 2013-05-25 5:17 UTC (permalink / raw)
To: kernelnewbies
Hi,
I want to implement a file system and integrate with my system. Now
first i have to implement the code for disk-formatting(like populating
the super_block , root inode etc). I want to see the source code for the
ext3 file system for this purpose.
Please tell me which file in the kernel source contains the
implementation.
^ permalink raw reply [flat|nested] 6+ messages in thread* File system implementation
2013-05-25 5:17 File system implementation Dibyayan Chakraborty
@ 2013-05-26 11:39 ` Greg Freemyer
2013-05-26 18:23 ` Sankar P
2013-05-27 8:05 ` Vineet Agarwal
2 siblings, 0 replies; 6+ messages in thread
From: Greg Freemyer @ 2013-05-26 11:39 UTC (permalink / raw)
To: kernelnewbies
Dibyayan Chakraborty <dib.coolguy@gmail.com> wrote:
>Hi,
>I want to implement a file system and integrate with my system. Now
>first i have to implement the code for disk-formatting(like populating
>the super_block , root inode etc). I want to see the source code for
>the
>ext3 file system for this purpose.
>
>Please tell me which file in the kernel source contains the
>implementation.
In general the kernel doesn't create the things. Mkfs does, so you need the source to mkfs.ext3.
Greg
--
Sent from my Android phone with K-9 Mail. Please excuse my brevity.
^ permalink raw reply [flat|nested] 6+ messages in thread
* File system implementation
2013-05-25 5:17 File system implementation Dibyayan Chakraborty
2013-05-26 11:39 ` Greg Freemyer
@ 2013-05-26 18:23 ` Sankar P
2013-05-27 8:05 ` Vineet Agarwal
2 siblings, 0 replies; 6+ messages in thread
From: Sankar P @ 2013-05-26 18:23 UTC (permalink / raw)
To: kernelnewbies
On Sat, May 25, 2013 at 10:47 AM, Dibyayan Chakraborty
<dib.coolguy@gmail.com> wrote:
> Hi,
> I want to implement a file system and integrate with my system. Now
> first i have to implement the code for disk-formatting(like populating
> the super_block , root inode etc). I want to see the source code for the
> ext3 file system for this purpose.
>
> Please tell me which file in the kernel source contains the
> implementation.
>
I did the same thing few days back and asked the same question few days back :)
It is very simple. All you need is to codify your structs. Then write
a simple mkfs-yourfs.c which will fopen the given input file, write
(by type casting to a char *) the struct pointer which contains your
filesystem structure and then closes the file. It is as simple as that
:)
All the best.
--
Sankar P
http://psankar.blogspot.com
^ permalink raw reply [flat|nested] 6+ messages in thread
* File system implementation
2013-05-25 5:17 File system implementation Dibyayan Chakraborty
2013-05-26 11:39 ` Greg Freemyer
2013-05-26 18:23 ` Sankar P
@ 2013-05-27 8:05 ` Vineet Agarwal
2 siblings, 0 replies; 6+ messages in thread
From: Vineet Agarwal @ 2013-05-27 8:05 UTC (permalink / raw)
To: kernelnewbies
On Sat, May 25, 2013 at 10:47 AM, Dibyayan Chakraborty <
dib.coolguy@gmail.com> wrote:
> Hi,
> I want to implement a file system and integrate with my system. Now
> first i have to implement the code for disk-formatting(like populating
> the super_block , root inode etc). I want to see the source code for the
> ext3 file system for this purpose.
>
> Please tell me which file in the kernel source contains the
> implementation.
>
>
>
You can start looking for e2fsprogs. You can find the details out there
regarding the file-system formatting etc.
>
> _______________________________________________
> Kernelnewbies mailing list
> Kernelnewbies at kernelnewbies.org
> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
>
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* File System Implementation
@ 2013-05-29 14:20 Dibyayan Chakraborty
2013-05-29 15:54 ` Greg Freemyer
0 siblings, 1 reply; 6+ messages in thread
From: Dibyayan Chakraborty @ 2013-05-29 14:20 UTC (permalink / raw)
To: kernelnewbies
Hi,
I was implementing a file system and ran into the following problem.
I wanted to replicate the super block data in order to recover from
occasional Hard disk failures (bit rot problem etc.). While replicating was
easy i could not find a way to detect the errors in the first place.
Any ideas and explanation will be help full.
--
With Regards
Dibyayan Chakraborty
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* File System Implementation
2013-05-29 14:20 File System Implementation Dibyayan Chakraborty
@ 2013-05-29 15:54 ` Greg Freemyer
0 siblings, 0 replies; 6+ messages in thread
From: Greg Freemyer @ 2013-05-29 15:54 UTC (permalink / raw)
To: kernelnewbies
Historically filesystem designers knew what legal values of the
various parameters were and they simply looked for legal values. If
they found any illegal values, they reset them to a legal value.
In many cases, that missed bit-rot situations they wanted to find, so
with many modern filesystems, they add a CRC field to the main
datastructures, then do a CRC verification as appropriate.
XFS is right now in the middle of getting a whole bunch of CRC
functionality added. I don't know if it is on the generation side, or
just on the verification side.
A quick google found this overview email to a patch series. The
series may have been posted again since then.
http://comments.gmane.org/gmane.comp.file-systems.xfs.general/51575
Notice there are links to the 3 previous overview emails. Go back and
read those, they may provide more background.
Greg
On Wed, May 29, 2013 at 10:20 AM, Dibyayan Chakraborty
<dib.coolguy@gmail.com> wrote:
> Hi,
> I was implementing a file system and ran into the following problem.
>
> I wanted to replicate the super block data in order to recover from
> occasional Hard disk failures (bit rot problem etc.). While replicating was
> easy i could not find a way to detect the errors in the first place.
>
> Any ideas and explanation will be help full.
>
> --
> With Regards
> Dibyayan Chakraborty
>
> _______________________________________________
> Kernelnewbies mailing list
> Kernelnewbies at kernelnewbies.org
> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
>
^ permalink raw reply [flat|nested] 6+ messages in thread
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2013-05-25 5:17 File system implementation Dibyayan Chakraborty
2013-05-26 11:39 ` Greg Freemyer
2013-05-26 18:23 ` Sankar P
2013-05-27 8:05 ` Vineet Agarwal
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2013-05-29 15:54 ` Greg Freemyer
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