http://src.opensolaris.org/source/xref/onnv/onnv-gate/usr/src/uts/common/fs/lookup.c#lookupnameat
 
194 lookuppnvp(
    195         struct pathname *pnp,           /* pathname to lookup */
    196         struct pathname *rpnp,          /* if non-NULL, return resolved 
path */
    197         int flags,                      /* follow symlinks */
    198         vnode_t **dirvpp,               /* ptr for parent vnode */
    199         vnode_t **compvpp,              /* ptr for entry vnode */
    200         vnode_t *rootvp,                /* rootvp */
    201         vnode_t *vp,                    /* directory to start search at 
*/
    202         cred_t *cr)                     /* user's credential */

it's so difficult  to understand this function ...
who would like to give me a lession please...
i just want to know how we get vnode  from a pathname...
 
 
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