loff_t *offp in read and write

[Deepak Joshi <deepak_cins@xxxxxxxxxxx>]

Hi all,
 
 I am not getting the use of loff_t *offp in read and write system call.  The syntax of read function is 
 
 ssize_t read(struct file *filp, char *buff,
     size_t count, loff_t *offp);
 
 The last pointer we can asscess from filp->f_pos. so plz guide me to get clear  this concept. 
 
 Thanks in advance,
 Deepak Joshi

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