[Pvfs2-users] What do the arguments in "PVFS_sys_read" mean?

[g_p g_p]

Hello, i would like to read a file from pvfs2.So, i'm trying to read the fie and i try to use the function
PVFS_sys_read(ref,req,off,buf,mem_req,creds,resp)
I can't understand these arguments and i don't know how to call PVFS_sys_read

May you please explain to me what these arguments mean?
thanks, in advance 		 	   		  
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