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Rev 2680 Rev 2683
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        ipc_answer_0(rid, EINVAL);
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        ipc_answer_0(rid, EINVAL);
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        return;
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        return;
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    }
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    }
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    /*
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    /*
- 
 
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     * Lock the open file structure so that no other thread can manipulate
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     * the same open file at a time.
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     */
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    futex_down(&file->lock);
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- 
 
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    /*
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     * Lock the file's node so that no other client can read/write to it at
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     * Lock the file's node so that no other client can read/write to it at
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     * the same time.
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     * the same time.
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     */
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     */
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    if (read)
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    if (read)
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        rwlock_reader_lock(&file->node->contents_rwlock);
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        rwlock_reader_lock(&file->node->contents_rwlock);
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        rwlock_reader_unlock(&file->node->contents_rwlock);
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        rwlock_reader_unlock(&file->node->contents_rwlock);
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    else
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    else
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        rwlock_writer_unlock(&file->node->contents_rwlock);
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        rwlock_writer_unlock(&file->node->contents_rwlock);
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    /*
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    /*
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     * Update the position pointer.
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     * Update the position pointer and unlock the open file.
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     */
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     */
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    file->pos += bytes;
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    file->pos += bytes;
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    futex_up(&file->lock);
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    /*
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    /*
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     * FS server's reply is the final result of the whole operation we
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     * FS server's reply is the final result of the whole operation we
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     * return to the client.
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     * return to the client.
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     */
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     */