[PATCH manpages] umount.2: restore mention of data loss with MNT_FORCE

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Recent patch to description of MNT_FORCE incorrectly
dropped the mention of possible data loss.  Restore it.

Signed-off-by: NeilBrown <neilb@xxxxxxxx>
---

Sorry, I thought I had put the mention of data loss back it, but clearly
not.

NeilBrown


 man2/umount.2 | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/man2/umount.2 b/man2/umount.2
index ccd1d07afe88..01f42710ee9d 100644
--- a/man2/umount.2
+++ b/man2/umount.2
@@ -63,9 +63,10 @@ controlling the behavior of the operation:
 .BR MNT_FORCE " (since Linux 2.1.116)"
 Ask the filesystem to abort pending requests before attempting the
 unmount.  This may allow the unmount to complete without waiting
-for an inaccessible server.  If, after aborting requests, some
-processes still have active references to the filesystem, the
-unmount will still fail. In Linux 4.12, only the filesystems
+for an inaccessible server, but could cause data loss.  If, after
+aborting requests, some processes still have active references to the
+filesystem, the unmount will still fail. In Linux 4.12, only the
+filesystems
 9p (2.6.16),
 ceph (2.6.34),
 cifs (2.6.12),
-- 
2.14.0.rc0.dirty

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