Author: marcus (doc,ports committer)
Date: Tue Dec 30 21:49:39 2008
New Revision: 186617
URL: http://svn.freebsd.org/changeset/base/186617
Log:
Add a VOP_VPTOCNP implementation for pseudofs which covers file systems
such as procfs and linprocfs.
This implementation's locking was enhanced by kib.
Reviewed by: kib
des
Approved by: des
kib
Tested by: pho
Modified:
head/sys/fs/pseudofs/pseudofs_vnops.c
Modified: head/sys/fs/pseudofs/pseudofs_vnops.c
==============================================================================
--- head/sys/fs/pseudofs/pseudofs_vnops.c Tue Dec 30 20:51:07 2008
(r186616)
+++ head/sys/fs/pseudofs/pseudofs_vnops.c Tue Dec 30 21:49:39 2008
(r186617)
@@ -310,6 +310,84 @@ pfs_getextattr(struct vop_getextattr_arg
}
/*
+ * Convert a vnode to its component name
+ */
+static int
+pfs_vptocnp(struct vop_vptocnp_args *ap)
+{
+ struct vnode *vp = ap->a_vp;
+ struct vnode **dvp = ap->a_vpp;
+ struct pfs_vdata *pvd = vp->v_data;
+ struct pfs_node *pd = pvd->pvd_pn;
+ struct pfs_node *pn;
+ struct mount *mp;
+ char *buf = ap->a_buf;
+ int *buflen = ap->a_buflen;
+ char pidbuf[PFS_NAMELEN];
+ pid_t pid = pvd->pvd_pid;
+ int len, i, error, locked;
+
+ i = *buflen;
+ error = 0;
+
+ pfs_lock(pd);
+
+ if (vp->v_type == VDIR && pd->pn_type == pfstype_root) {
+ *dvp = vp;
+ vhold(*dvp);
+ pfs_unlock(pd);
+ PFS_RETURN (0);
+ } else if (vp->v_type == VDIR && pd->pn_type == pfstype_procdir) {
+ len = snprintf(pidbuf, sizeof(pidbuf), "%d", pid);
+ i -= len;
+ if (i < 0) {
+ error = ENOMEM;
+ goto failed;
+ }
+ bcopy(pidbuf, buf + i, len);
+ } else {
+ i -= strlen(pd->pn_name);
+ if (i < 0) {
+ error = ENOMEM;
+ goto failed;
+ }
+ bcopy(pd->pn_name, buf + i, strlen(pd->pn_name));
+ }
+
+ pn = pd->pn_parent;
+ pfs_unlock(pd);
+
+ mp = vp->v_mount;
+ error = vfs_busy(mp, 0);
+ if (error)
+ return (error);
+
+ /*
+ * vp is held by caller.
+ */
+ locked = VOP_ISLOCKED(vp);
+ VOP_UNLOCK(vp, 0);
+
+ error = pfs_vncache_alloc(mp, dvp, pn, pid);
+ if (error) {
+ vn_lock(vp, locked | LK_RETRY);
+ vfs_unbusy(mp);
+ PFS_RETURN(error);
+ }
+
+ *buflen = i;
+ vhold(*dvp);
+ vput(*dvp);
+ vn_lock(vp, locked | LK_RETRY);
+ vfs_unbusy(mp);
+
+ PFS_RETURN (0);
+failed:
+ pfs_unlock(pd);
+ PFS_RETURN(error);
+}
+
+/*
* Look up a file or directory
*/
static int
@@ -890,6 +968,7 @@ struct vop_vector pfs_vnodeops = {
.vop_rmdir = VOP_EOPNOTSUPP,
.vop_setattr = pfs_setattr,
.vop_symlink = VOP_EOPNOTSUPP,
+ .vop_vptocnp = pfs_vptocnp,
.vop_write = pfs_write,
/* XXX I've probably forgotten a few that need VOP_EOPNOTSUPP */
};
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