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Linux - Embedded & Single-board computer This forum is for the discussion of Linux on both embedded devices and single-board computers (such as the Raspberry Pi, BeagleBoard and PandaBoard). Discussions involving Arduino, plug computers and other micro-controller like devices are also welcome.

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Old 02-10-2011, 06:54 AM   #1
maartenrvd
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Registered: Jun 2010
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problem logging to a file on a jffs2


I'm using an embedded system on which a 200kB (uncompressed size) jffs2 file-system is used to rfid transactions.

This gives the following problems:
  1. Estimating the remaining free space does not work (that was expected). This is not very bad but it would be nice to know in advance whether logging a transaction will work.
  2. When the file-system is full, the write() does not give back an error code! This is bad! I 'solved' this by verifying the file contents by reading it completely. No need to say that costs performance.
  3. compression does not work properly: the file system is full after a limited (~100-400) amount of writes. This is very bad! Not only does this mean that the number of transactions that can be logged is much to low, but also that it can not be predicted when it will fail!
Does somebody know a way to solve or work around these problems?
E.g. using some configuration parameter for jffs2 or using another file system type?
Note that it should be able to handle flash memory, lots of small writes (~5000 per day) without waring out the flash, and it should be reliable so power outages won't corrupt the file-system.

(and I apologize for my English )
 
Old 02-11-2011, 03:01 AM   #2
Oliv'
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Hello,

From my point of view and because I have already used it, JFFS2 is a really crappy filesystem. I think that you should have a look at UBIFS which is its successor: http://www.linux-mtd.infradead.org/doc/ubifs.html
The only drawback is that you will have to have a kernel version of 2.6.27 or higher else you may have a lot of integration problems.

Kind regards,

Oliv'
 
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Old 02-11-2011, 03:16 AM   #3
maartenrvd
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Thanks, I did not know UBIFS. I'll certainly have a look at it.

Meanwhile, is there anyone with another suggestion?
 
Old 02-11-2011, 04:20 AM   #4
cnxsoft
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I've also used JFFs2. Once the partition is almost full a lot of problems occur, the partition becomes read-only, you can't delete files, etc... The only workaround we found is to increase the partition size so that there is enough space for jffs2 to do the things it needs (e.g. garbage collection).
 
  


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