Unlinking large files in IMFS

[Joel Sherrill]

Just so everyone will know.  This bug was previously reported by 
Jose Sturniolo <jsturnio at nec.com.ar> and the fix is in 4.5.0.
By accident, the same patch was not applied to the development
branch and thus was missing in snapshots.

--joel


Andy Dachs wrote:
> 
> I just updated my MPC8260 BSP to work with the rtems-ss-20010126 snapshot.  Its still a little rough around the edges but I came across a problem unlinking large files which I don't think is related to my BSP.  I saw similar symptoms with the beta3a release but never investigated fully.
> 
> Attached is a small test routine to demonstrate the problem.  Modify the NUM_BLOCKS value to get different file sizes (a value of 264 or above should generate the assertion).
> 
> Writing a 128k file and then calling unlink() is fine:
> 
> *** CRASH TEST, dummy? ***
> Writing file of 131584 bytes
> Written file
> Now trying to unlink it
> Success
> 
> Going to 135168 bytes generates an error:
> 
> *** CRASH TEST, dummy? ***
> Writing file of 135168 bytes
> Written file
> Now trying to unlink it
> assertion "0" failed: file "../../../../../../rtems-ss-20010126-afd/c/src/lib/libc/malloc.c", line 323
> 
> Just below that number is fine again:
> 
> *** CRASH TEST, dummy? ***
> Writing file of 134656 bytes
> Written file
> Now trying to unlink it
> Success
> 
> I should have enough heap (4M) so I don't think that's a problem.  By my calculations 135168 bytes is the magic number where triply indirect blocks would be required (for a filesystem using 128 byte blocks) so could it be related to that?
> 
> Any suggestions?
> 
> Andy
> 
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-- 
Joel Sherrill, Ph.D.             Director of Research & Development
joel at OARcorp.com                 On-Line Applications Research
Ask me about RTEMS: a free RTOS  Huntsville AL 35805
   Support Available             (256) 722-9985