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Add the utility function vn_commname() to retrieve the command name

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from the vfs namecache, when available.

Reviewed by:	rwatson, rdivacky
Tested by:	pho
This commit is contained in:
Konstantin Belousov 2008-03-31 11:53:03 +00:00
parent bc04791c82
commit 0a3af16a75
2 changed files with 20 additions and 0 deletions
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19
sys/kern/vfs_cache.c
View File

@ -838,3 +838,22 @@ vn_fullpath1(struct thread *td, struct vnode *vp, struct vnode *rdir,
*retbuf = bp;
return (0);
}
int
vn_commname(struct vnode *vp, char *buf, u_int buflen)
{
struct namecache *ncp;
int l;
CACHE_LOCK();
ncp = TAILQ_FIRST(&vp->v_cache_dst);
if (!ncp) {
CACHE_UNLOCK();
return (ENOENT);
}
l = min(ncp->nc_nlen, buflen - 1);
memcpy(buf, ncp->nc_name, l);
CACHE_UNLOCK();
buf[l] = '\0';
return (0);
}

1
sys/sys/vnode.h
View File

@ -579,6 +579,7 @@ int speedup_syncer(void);
vn_fullpath(FIRST_THREAD_IN_PROC(p), (p)->p_textvp, rb, rfb)
int vn_fullpath(struct thread *td, struct vnode *vn,
char **retbuf, char **freebuf);
int vn_commname(struct vnode *vn, char *buf, u_int buflen);
int vaccess(enum vtype type, mode_t file_mode, uid_t file_uid,
gid_t file_gid, mode_t acc_mode, struct ucred *cred,
int *privused);