[manpages PATCH] open_by_handle_at.2: clarify MAX_HANDLE_SZ

[NeilBrown <neilb@suse.com>]

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As hinted in the kernel source, MAX_HANDLE_SZ is a hint
rather than a promise:

    /* limit the handle size to NFSv4 handle size now */
    #define MAX_HANDLE_SZ 128

Note the "now" (probably should be "for now").
So change the description to make this clear.

Reported-by: Lennart Poettering <lennart@poettering.net>
Signed-off-by: NeilBrown <neilb@suse.com>
---
 man2/open_by_handle_at.2 | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/man2/open_by_handle_at.2 b/man2/open_by_handle_at.2
index 79987308bf3e..f3473d24fa50 100644
--- a/man2/open_by_handle_at.2
+++ b/man2/open_by_handle_at.2
@@ -91,7 +91,8 @@ field should be initialized to contain the allocated size for
 .BR MAX_HANDLE_SZ ,
 defined in
 .IR <fcntl.h> ,
-specifies the maximum possible size for a file handle.)
+specifies the maximum expected size for a file handle. It is not a
+guaranteed upper limit as future filesystems may require more space.)
 Upon successful return, the
 .IR handle_bytes
 field is updated to contain the number of bytes actually written to
-- 
2.14.0.rc0.dirty


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