+/*
+ * Do a sysctl by fsid.
+ */
+static int
+sysctl_vfs_ctlbyfsid SYSCTL_HANDLER_ARGS
+{
+ struct vfsidctl vc;
+ struct mount *mp;
+ struct statfs *sp;
+ struct proc *p;
+ int *name;
+ int error, flags, namelen;
+
+ name = arg1;
+ namelen = arg2;
+ p = req->p;
+
+ error = SYSCTL_IN(req, &vc, sizeof(vc));
+ if (error)
+ return (error);
+ if (vc.vc_vers != VFS_CTL_VERS1)
+ return (EINVAL);
+ mp = vfs_getvfs(&vc.vc_fsid);
+ if (mp == NULL)
+ return (ENOENT);
+ /* reset so that the fs specific code can fetch it. */
+ req->newidx = 0;
+ /*
+ * Note if this is a VFS_CTL then we pass the actual sysctl req
+ * in for "oldp" so that the lower layer can DTRT and use the
+ * SYSCTL_IN/OUT routines.
+ */
+ if (mp->mnt_op->vfs_sysctl != NULL) {
+ error = mp->mnt_op->vfs_sysctl(name, namelen,
+ req, NULL, NULL, 0, req->p);
+ if (error != EOPNOTSUPP)
+ return (error);
+ }
+ switch (name[0]) {
+ case VFS_CTL_UMOUNT:
+ VCTLTOREQ(&vc, req);
+ error = SYSCTL_IN(req, &flags, sizeof(flags));
+ if (error)
+ break;
+ error = safedounmount(mp, flags, p);
+ break;
+ case VFS_CTL_STATFS:
+ VCTLTOREQ(&vc, req);
+ error = SYSCTL_IN(req, &flags, sizeof(flags));
+ if (error)
+ break;
+ sp = &mp->mnt_stat;
+ if (((flags & MNT_NOWAIT) == 0 || (flags & MNT_WAIT)) &&
+ (error = VFS_STATFS(mp, sp, p)))
+ return (error);
+ sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
+ error = SYSCTL_OUT(req, sp, sizeof(*sp));
+ break;
+ default:
+ return (EOPNOTSUPP);
+ }
+ return (error);
+}
+
+static int filt_fsattach(struct knote *kn);
+static void filt_fsdetach(struct knote *kn);
+static int filt_fsevent(struct knote *kn, long hint);
+
+struct filterops fs_filtops =
+ { 0, filt_fsattach, filt_fsdetach, filt_fsevent };
+
+static int
+filt_fsattach(struct knote *kn)
+{
+
+ kn->kn_flags |= EV_CLEAR;
+ KNOTE_ATTACH(&fs_klist, kn);
+ return (0);
+}
+
+static void
+filt_fsdetach(struct knote *kn)
+{
+
+ KNOTE_DETACH(&fs_klist, kn);
+}
+
+static int
+filt_fsevent(struct knote *kn, long hint)
+{
+
+ kn->kn_fflags |= hint;
+ return (kn->kn_fflags != 0);
+}
+
+static int
+sysctl_vfs_noremotehang SYSCTL_HANDLER_ARGS
+{
+ int out, error;
+ pid_t pid;
+ size_t space;
+ struct proc *p;
+
+ /* We need a pid. */
+ if (req->newptr == NULL)
+ return (EINVAL);
+
+ error = SYSCTL_IN(req, &pid, sizeof(pid));
+ if (error)
+ return (error);
+
+ p = pfind(pid < 0 ? -pid : pid);
+ if (p == NULL)
+ return (ESRCH);
+
+ /*
+ * Fetching the value is ok, but we only fetch if the old
+ * pointer is given.
+ */
+ if (req->oldptr != NULL) {
+ out = !((p->p_flag & P_NOREMOTEHANG) == 0);
+ error = SYSCTL_OUT(req, &out, sizeof(out));
+ return (error);
+ }
+
+ /* cansignal offers us enough security. */
+ if (p != req->p && suser(req->p->p_ucred, &req->p->p_acflag) != 0)
+ return (EPERM);
+
+ if (pid < 0)
+ p->p_flag &= ~P_NOREMOTEHANG;
+ else
+ p->p_flag |= P_NOREMOTEHANG;
+
+ return (0);
+}
+/* the vfs.generic. branch. */
+SYSCTL_NODE(_vfs, VFS_GENERIC, generic, CTLFLAG_RW, 0, "vfs generic hinge");
+/* retreive a list of mounted filesystem fsid_t */
+SYSCTL_PROC(_vfs_generic, OID_AUTO, vfsidlist, CTLFLAG_RD,
+ 0, 0, sysctl_vfs_vfslist, "S,fsid", "List of mounted filesystem ids");
+/* perform operations on filesystem via fsid_t */
+SYSCTL_NODE(_vfs_generic, OID_AUTO, ctlbyfsid, CTLFLAG_RW,
+ sysctl_vfs_ctlbyfsid, "ctlbyfsid");
+SYSCTL_PROC(_vfs_generic, OID_AUTO, noremotehang, CTLFLAG_RW,
+ 0, 0, sysctl_vfs_noremotehang, "I", "noremotehang");
+
projects / apple / xnu.git / blobdiff