mount: (man) add note about --all to remount desc

Signed-off-by: Karel Zak <kzak@redhat.com>

diff --git a/sys-utils/mount.8 b/sys-utils/mount.8
index 6ef58905058ddcbd81bacd136e19e9b4e369d9c9..73d816c3005af2171811c7ddbcbee11ab688e1a9 100644 (file)
--- a/sys-utils/mount.8
+++ b/sys-utils/mount.8
@@ -1218,6 +1218,18 @@ After this call, mount reads fstab and merges these options with
 the options from the command line (\fB\-o\fR).
 If no mountpoint is found in fstab, then a remount with unspecified source is
 allowed.
+.sp
+mount(8) allows to use \fB\-\-all\fR to remount all already mounted filesystems
+which match a specified filter (\fB\-O\fR and \fB\-t\fR).  For example:
+.sp
+.in +4
+.B "mount \-\-all \-o remount,ro -t vfat"
+.in
+.sp
+remounts all already mounted vfat filesystems in read-only mode. The each of the
+filesystems is remounted by "mount \-o remount,ro /dir" semantic. It means the
+mount command reads fstab or mtab and merges these options with the options
+from the command line.
 .TP
 .B ro
 Mount the filesystem read-only.