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Implement VOP_VPTOCNP for devfs. Directory and character device vnodes are

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properly translated to their component names.

Reviewed by:	arch
Approved by:	kib
This commit is contained in:
marcus 2008-12-12 01:00:38 +00:00
parent baed66a337
commit 8fb62ae773
1 changed files with 65 additions and 0 deletions
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65
sys/fs/devfs/devfs_vnops.c
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@ -185,6 +185,69 @@ devfs_clear_cdevpriv(void)
devfs_fpdrop(fp);
}
static int
devfs_vptocnp(struct vop_vptocnp_args *ap)
{
struct vnode *vp = ap->a_vp;
struct vnode **dvp = ap->a_vpp;
struct devfs_mount *dmp;
char *buf = ap->a_buf;
int *buflen = ap->a_buflen;
struct devfs_dirent *dd, *de;
int i, error;
dmp = VFSTODEVFS(vp->v_mount);
i = *buflen;
dd = vp->v_data;
error = 0;
sx_xlock(&dmp->dm_lock);
if (vp->v_type == VCHR) {
i -= strlen(dd->de_cdp->cdp_c.si_name);
if (i < 0) {
error = ENOMEM;
goto finished;
}
bcopy(dd->de_cdp->cdp_c.si_name, buf + i,
strlen(dd->de_cdp->cdp_c.si_name));
de = dd->de_dir;
} else if (vp->v_type == VDIR) {
if (dd == dmp->dm_rootdir) {
*dvp = vp;
vhold(*dvp);
goto finished;
}
i -= dd->de_dirent->d_namlen;
if (i < 0) {
error = ENOMEM;
goto finished;
}
bcopy(dd->de_dirent->d_name, buf + i,
dd->de_dirent->d_namlen);
de = dd;
} else {
error = ENOENT;
goto finished;
}
*buflen = i;
de = TAILQ_FIRST(&de->de_dlist); /* "." */
de = TAILQ_NEXT(de, de_list); /* ".." */
de = de->de_dir;
mtx_lock(&devfs_de_interlock);
*dvp = de->de_vnode;
if (*dvp != NULL) {
VI_LOCK(*dvp);
mtx_unlock(&devfs_de_interlock);
vholdl(*dvp);
VI_UNLOCK(*dvp);
} else
error = ENOENT;
finished:
sx_xunlock(&dmp->dm_lock);
return (error);
}
/*
* Construct the fully qualified path name relative to the mountpoint
*/
@ -1465,6 +1528,7 @@ static struct vop_vector devfs_vnodeops = {
.vop_setlabel = devfs_setlabel,
#endif
.vop_symlink = devfs_symlink,
.vop_vptocnp = devfs_vptocnp,
};
static struct vop_vector devfs_specops = {
@ -1499,6 +1563,7 @@ static struct vop_vector devfs_specops = {
#endif
.vop_strategy = VOP_PANIC,
.vop_symlink = VOP_PANIC,
.vop_vptocnp = devfs_vptocnp,
.vop_write = VOP_PANIC,
};