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From "Rupesh Kumar (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (VFS-396) RAM FileSystem allows the file system size to exceed the max size limit.
Date Sun, 27 Nov 2011 20:49:39 GMT
RAM FileSystem allows the file system size to exceed the max size limit.
------------------------------------------------------------------------

                 Key: VFS-396
                 URL: https://issues.apache.org/jira/browse/VFS-396
             Project: Commons VFS
          Issue Type: Bug
    Affects Versions: 2.0
         Environment: All
            Reporter: Rupesh Kumar


When a new file is created in the RAM file system, and content is written to its outputstream,
there is a check in place for ensuring that file system size does not exceed the max limit
set. But that check is wrong.

In RamFileOutputStream.write(), you calculate the size, newsize and call file.resize(newSize)
And in the RamFileObject.resize(), there is a check 
 if (fs.size() + newSize - this.size() > maxSize)
            {
                throw new IOException("FileSystem capacity (" + maxSize
                        + ") exceeded.");
            }

This check is wrong. 
Consider this case of a new file system where the file system size is set to 5 MB and I am
trying to create a file of 10 MB in the RAM file system. the file is being written in the
chunk of 8 kb. For every resize check, fs.size() would be 0 and (newsize - this.size()) would
be 8 kb and therefore the check never passes.

 It could have been correct if the "old size" was locked down to the size that was registered
with the file system but the old size (this.size()) keeps changing at every write. Thus the
difference in newSize and this.size() would always be the chunk size (typically 8 kb) and
therefore no exception would be thrown ever.

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