+ simple_lock(&mountlist_slock);
+ CIRCLEQ_FOREACH(mp, &mountlist, mnt_list)
+ ret++;
+ simple_unlock(&mountlist_slock);
+ return (ret);
+}
+
+/*
+ * fill in the array of fsid_t's up to a max of 'count', the actual
+ * number filled in will be set in '*actual'. If there are more fsid_t's
+ * than room in fsidlst then ENOMEM will be returned and '*actual' will
+ * have the actual count.
+ * having *actual filled out even in the error case is depended upon.
+ */
+static int
+sysctl_vfs_getvfslist(fsid_t *fsidlst, int count, int *actual)
+{
+ struct mount *mp;
+
+ *actual = 0;
+ simple_lock(&mountlist_slock);
+ CIRCLEQ_FOREACH(mp, &mountlist, mnt_list) {
+ (*actual)++;
+ if (*actual <= count)
+ fsidlst[(*actual) - 1] = mp->mnt_stat.f_fsid;
+ }
+ simple_unlock(&mountlist_slock);
+ return (*actual <= count ? 0 : ENOMEM);
+}
+
+static int
+sysctl_vfs_vfslist SYSCTL_HANDLER_ARGS
+{
+ int actual, error;
+ size_t space;
+ fsid_t *fsidlst;
+
+ /* This is a readonly node. */
+ if (req->newptr != NULL)
+ return (EPERM);
+
+ /* they are querying us so just return the space required. */
+ if (req->oldptr == NULL) {
+ req->oldidx = sysctl_vfs_getvfscnt() * sizeof(fsid_t);
+ return 0;
+ }
+again:
+ /*
+ * Retrieve an accurate count of the amount of space required to copy
+ * out all the fsids in the system.
+ */
+ space = req->oldlen;
+ req->oldlen = sysctl_vfs_getvfscnt() * sizeof(fsid_t);
+
+ /* they didn't give us enough space. */
+ if (space < req->oldlen)
+ return (ENOMEM);
+
+ MALLOC(fsidlst, fsid_t *, req->oldlen, M_TEMP, M_WAITOK);
+ error = sysctl_vfs_getvfslist(fsidlst, req->oldlen / sizeof(fsid_t),
+ &actual);
+ /*
+ * If we get back ENOMEM, then another mount has been added while we
+ * slept in malloc above. If this is the case then try again.
+ */
+ if (error == ENOMEM) {
+ FREE(fsidlst, M_TEMP);
+ req->oldlen = space;
+ goto again;
+ }
+ if (error == 0) {
+ error = SYSCTL_OUT(req, fsidlst, actual * sizeof(fsid_t));
+ }
+ FREE(fsidlst, M_TEMP);
+ return (error);
+}
+
+/*
+ * 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);
+ }
projects / apple / xnu.git / blobdiff