util-linux: Add explanation for new mount options flushonfsync andnoflushonfsync to mount(8) man page

[Fernando Luis Vázquez Cao]

Signed-off-by: Fernando Luis Vazquez Cao <fernando@xxxxxxxxxxxxx>
---

diff -urp mount-orig/mount.8 mount/mount.8
--- mount-orig/mount.8	2009-01-29 15:50:50.000000000 +0900
+++ mount/mount.8	2009-01-29 15:40:39.000000000 +0900
@@ -649,6 +649,18 @@ current modify or change time. (Similar 
 mutt or other applications that need to know if a file has been read
 since the last time it was modified.)
 .TP
+.B flushonfsync
+Force block device flush on fsync()/fdatasync(). When using storage equipped
+with write caches that can be explicitly flushed by the kernel, this guarantees
+that the data/metadata actually made it to the physical media after invoking
+the respective file data/metadata synchronization system call.
+.TP
+.B noflushonfsync
+Do not force a flush of the backing device's write cache when a file
+data/metadata synchronization system call is executed. Unless the device is
+equipped with a battery-backup write cache, this behavior can cause data loss
+and/or file system corruption in the event of a power failure.
+.TP
 .B noauto
 Can only be mounted explicitly (i.e., the
 .B \-a


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