Add vfs_getopt_size. Support human readable file system options in tmpfs.

Increase maximum tmpfs file system size to 4GB*PAGE_SIZE on 32 bit archs.

Discussed with:	delphij
MFC after:	2 weeks

1 files changed, 42 insertions, 0 deletions

diff --git a/sys/kern/vfs_mount.c b/sys/kern/vfs_mount.c
index 93387ca..657fa92 100644
--- a/sys/kern/vfs_mount.c
+++ b/sys/kern/vfs_mount.c
@@ -1520,6 +1520,48 @@ vfs_getopt_pos(struct vfsoptlist *opts, const char *name)
 	return (-1);
 }
 
+int
+vfs_getopt_size(struct vfsoptlist *opts, const char *name, off_t *value)
+{
+	char *opt_value, *vtp;
+	quad_t iv;
+	int error, opt_len;
+
+	error = vfs_getopt(opts, name, (void **)&opt_value, &opt_len);
+	if (error != 0)
+		return (error);
+	if (opt_len == 0 || opt_value == NULL)
+		return (EINVAL);
+	if (opt_value[0] == '\0' || opt_value[opt_len - 1] != '\0')
+		return (EINVAL);
+	iv = strtoq(opt_value, &vtp, 0);
+	if (vtp == opt_value || (vtp[0] != '\0' && vtp[1] != '\0'))
+		return (EINVAL);
+	if (iv < 0)
+		return (EINVAL);
+	switch (vtp[0]) {
+	case 't':
+	case 'T':
+		iv *= 1024;
+	case 'g':
+	case 'G':
+		iv *= 1024;
+	case 'm':
+	case 'M':
+		iv *= 1024;
+	case 'k':
+	case 'K':
+		iv *= 1024;
+	case '\0':
+		break;
+	default:
+		return (EINVAL);
+	}
+	*value = iv;
+
+	return (0);
+}
+
 char *
 vfs_getopts(struct vfsoptlist *opts, const char *name, int *error)
 {