The Journaling Flash File System for Linux

Tomasz Chmielewski | 5 Apr 15:08

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creating jffs2 filesystem on ext3

Hi,

As jffs2 is the only stable filesystem for Linux that is capable of r/w
compression, I wanted to test it a bit.

I have a 23 GB ext3 /mnt/test partition on which I would like to create 
a ~23 GB jffs2 image.

My / partiton is about 9 GB.

How can I create that big jffs2 image?

man doesn't say much (at least for me); it seems that it's only possible
to create images from an existing directory.

Does it mean I won't be able to create an empty 23 GB jffs2 image?

Or perhaps I didn't see some option?

Tomek

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David Woodhouse | 5 Apr 15:45

Re: creating jffs2 filesystem on ext3

On Tue, 2005-04-05 at 15:08 +0200, Tomasz Chmielewski wrote:
> Does it mean I won't be able to create an empty 23 GB jffs2 image?
> 
> Or perhaps I didn't see some option?

JFFS2 won't handle images larger than 4GiB, and as a fully log-
structured file system its RAM usage will probably become prohibitive
before you get that big. We're working on tricks to make it scale
better, but until that's done there's little point in dealing with the
4GiB limit. That one isn't a JFFS2 problem per se; it's just that the
MTD core doesn't handle devices larger than that.

--

-- 
dwmw2

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Jörn Engel | 5 Apr 16:34

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Re: creating jffs2 filesystem on ext3

On Tue, 5 April 2005 15:08:14 +0200, Tomasz Chmielewski wrote:
> 
> As jffs2 is the only stable filesystem for Linux that is capable of r/w
> compression, I wanted to test it a bit.
> 
> I have a 23 GB ext3 /mnt/test partition on which I would like to create 
> a ~23 GB jffs2 image.
> 
> My / partiton is about 9 GB.
> 
> How can I create that big jffs2 image?

You cannot.  The mtd interface is limited to 4GiB.  Not sure if anyone
has tested a 4GiB filesystem yet, so the effective limit might be
lower, due to bugs.  2GiB minus a bit should be safe.

Easiest would be to fill the device with 0xff, use an mtd translation
and mount it as jffs2.

Also note that block2mtd, as of 2.6.11[.*] is broken, so either update
to mtd cvs or use blkmtd as translation.

Jörn

--

-- 
When in doubt, punt.  When somebody actually complains, go back and fix it...
The 90% solution is a good thing.
-- Rob Landley

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David Woodhouse | 5 Apr 17:07

Re: creating jffs2 filesystem on ext3

On Tue, 2005-04-05 at 16:34 +0200, Jörn Engel wrote:
> Also note that block2mtd, as of 2.6.11[.*] is broken, so either update
> to mtd cvs or use blkmtd as translation.

Is the fix not already in the BK tree and hence in Andrew's 2.6.x-mm
tree.

--

-- 
dwmw2

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Jörn Engel | 5 Apr 17:17

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Re: creating jffs2 filesystem on ext3

On Tue, 5 April 2005 16:07:06 +0100, David Woodhouse wrote:
> On Tue, 2005-04-05 at 16:34 +0200, Jörn Engel wrote:
> > Also note that block2mtd, as of 2.6.11[.*] is broken, so either update
> > to mtd cvs or use blkmtd as translation.
> 
> Is the fix not already in the BK tree and hence in Andrew's 2.6.x-mm
> tree.

Didn't see it yet, checking...
Kernel.org is slow, it may take a byte (just to ridicule Artem ;)

Jörn

--

-- 
tglx1 thinks that joern should get a (TM) for "Thinking Is Hard"
-- Thomas Gleixner

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Jörn Engel | 5 Apr 18:00

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Re: creating jffs2 filesystem on ext3

On Tue, 5 April 2005 17:17:45 +0200, Jörn Engel wrote:
> On Tue, 5 April 2005 16:07:06 +0100, David Woodhouse wrote:
> > On Tue, 2005-04-05 at 16:34 +0200, Jörn Engel wrote:
> > > Also note that block2mtd, as of 2.6.11[.*] is broken, so either update
> > > to mtd cvs or use blkmtd as translation.
> > 
> > Is the fix not already in the BK tree and hence in Andrew's 2.6.x-mm
> > tree.

2.6.12-rc2-mm1 has the fix.

Jörn

--

-- 
Optimizations always bust things, because all optimizations are, in
the long haul, a form of cheating, and cheaters eventually get caught.
-- Larry Wall 

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Adrian Bunk | 23 Apr 01:59

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[2.6 patch] fs/jffs/: cleanups

This patch contains the following cleanups:
- make needlessly global functions static
- provide some debugging helper functions only for appropriate
  values of CONFIG_JFFS_FS_VERBOSE

Signed-off-by: Adrian Bunk <bunk <at> stusta.de>

---

 fs/jffs/intrep.c  |  114 ++++++++++++++++++++++------------------------
 fs/jffs/intrep.h  |    2 
 fs/jffs/jffs_fm.c |  105 +++++++++++++++++++++---------------------
 fs/jffs/jffs_fm.h |    3 -
 4 files changed, 112 insertions(+), 112 deletions(-)

--- linux-2.6.12-rc2-mm3-full/fs/jffs/intrep.h.old	2005-04-20 23:21:56.000000000 +0200
+++ linux-2.6.12-rc2-mm3-full/fs/jffs/intrep.h	2005-04-20 23:24:10.000000000 +0200
@@ -49,8 +49,6 @@
 void jffs_garbage_collect_trigger(struct jffs_control *c);

 /* For debugging purposes.  */
-void jffs_print_node(struct jffs_node *n);
-void jffs_print_raw_inode(struct jffs_raw_inode *raw_inode);
 #if 0
 int jffs_print_file(struct jffs_file *f);
 #endif  /*  0  */
--- linux-2.6.12-rc2-mm3-full/fs/jffs/intrep.c.old	2005-04-20 23:23:03.000000000 +0200
+++ linux-2.6.12-rc2-mm3-full/fs/jffs/intrep.c	2005-04-21 00:18:40.000000000 +0200
@@ -175,8 +175,64 @@
 	}

(Continue reading)

Adrian Bunk | 23 Apr 02:00

Picon

[2.6 patch] fs/jffs2/: make some functions static

This patch makes some needlessly global functions static.

Signed-off-by: Adrian Bunk <bunk <at> stusta.de>

---

 fs/jffs2/compr_rubin.c |   18 ++++++++++++------
 fs/jffs2/compr_zlib.c  |   12 ++++++++----
 2 files changed, 20 insertions(+), 10 deletions(-)

--- linux-2.6.12-rc2-mm3-full/fs/jffs2/compr_rubin.c.old	2005-04-20 23:28:57.000000000 +0200
+++ linux-2.6.12-rc2-mm3-full/fs/jffs2/compr_rubin.c	2005-04-20 23:30:09.000000000 +0200
@@ -228,8 +228,10 @@
 	return rubin_do_compress(BIT_DIVIDER_MIPS, bits_mips, data_in, cpage_out, sourcelen, dstlen);
 }
 #endif
-int jffs2_dynrubin_compress(unsigned char *data_in, unsigned char *cpage_out, 
-		   uint32_t *sourcelen, uint32_t *dstlen, void *model)
+static int jffs2_dynrubin_compress(unsigned char *data_in,
+				   unsigned char *cpage_out, 
+				   uint32_t *sourcelen, uint32_t *dstlen,
+				   void *model)
 {
 	int bits[8];
 	unsigned char histo[256];
@@ -306,15 +308,19 @@
 }		   

 
-int jffs2_rubinmips_decompress(unsigned char *data_in, unsigned char *cpage_out,

(Continue reading)

Arjan van de Ven | 23 Apr 09:38

Re: [2.6 patch] fs/jffs2/: make some functions static

On Sat, 2005-04-23 at 02:00 +0200, Adrian Bunk wrote:
> This patch makes some needlessly global functions static.
> 
> Signed-off-by: Adrian Bunk <bunk <at> stusta.de>
> 
> ---
> 
>  fs/jffs2/compr_rubin.c |   18 ++++++++++++------

> --- linux-2.6.12-rc2-mm3-full/fs/jffs2/compr_rubin.c.old	2005-04-20 23:28:57.000000000 +0200
> +++ linux-2.6.12-rc2-mm3-full/fs/jffs2/compr_rubin.c	2005-04-20 23:30:09.000000000 +0200
> @@ -228,8 +228,10 @@
>  	return rubin_do_compress(BIT_DIVIDER_MIPS, bits_mips, data_in, cpage_out, sourcelen, dstlen);
>  }
>  #endif
> -int jffs2_dynrubin_compress(unsigned char *data_in, unsigned char *cpage_out, 
> -		   uint32_t *sourcelen, uint32_t *dstlen, void *model)
> +static int jffs2_dynrubin_compress(unsigned char *data_in,
> +				   unsigned char *cpage_out, 
> +				   uint32_t *sourcelen, uint32_t *dstlen,
> +				   void *model)
>  {
>  	int bits[8];
>  	unsigned char histo[256];
> @@ -306,15 +308,19 @@
>  }		   
>  
> 
> -int jffs2_rubinmips_decompress(unsigned char *data_in, unsigned char *cpage_out, 
> -		   uint32_t sourcelen, uint32_t dstlen, void *model)

(Continue reading)

Adrian Bunk | 1 May 17:42

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[2.6 patch] fs/jffs/: cleanups

This patch contains the following cleanups:
- make needlessly global functions static
- provide some debugging helper functions only for appropriate
  values of CONFIG_JFFS_FS_VERBOSE

Signed-off-by: Adrian Bunk <bunk <at> stusta.de>

---

This patch was already sent on:
- 23 Apr 2005

 fs/jffs/intrep.c  |  114 ++++++++++++++++++++++------------------------
 fs/jffs/intrep.h  |    2 
 fs/jffs/jffs_fm.c |  105 +++++++++++++++++++++---------------------
 fs/jffs/jffs_fm.h |    3 -
 4 files changed, 112 insertions(+), 112 deletions(-)

--- linux-2.6.12-rc2-mm3-full/fs/jffs/intrep.h.old	2005-04-20 23:21:56.000000000 +0200
+++ linux-2.6.12-rc2-mm3-full/fs/jffs/intrep.h	2005-04-20 23:24:10.000000000 +0200
@@ -49,8 +49,6 @@
 void jffs_garbage_collect_trigger(struct jffs_control *c);

 /* For debugging purposes.  */
-void jffs_print_node(struct jffs_node *n);
-void jffs_print_raw_inode(struct jffs_raw_inode *raw_inode);
 #if 0
 int jffs_print_file(struct jffs_file *f);
 #endif  /*  0  */
--- linux-2.6.12-rc2-mm3-full/fs/jffs/intrep.c.old	2005-04-20 23:23:03.000000000 +0200

(Continue reading)

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[AT91RM9200] further run-time problems (jffs2, Oops in __update_rq_clo (12 Nov 15:45)
jffs2_init_acl_post() can return uninitialized variable (27 Oct 16:18)
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