tree 56f89cbfd95a55f5d750710d9ca950bf8992fdf1
parent 43388b21e72d36204822bcc3119e42abe6ebceef
author Al Viro <viro@zeniv.linux.org.uk> 1472518595 -0400
committer Al Viro <viro@zeniv.linux.org.uk> 1481397918 -0500

9p: saner ->write_end() on failing copy into non-uptodate page

If we had a short copy into an uptodate page, there's no reason
whatsoever to zero anything; OTOH, if that page had _not_ been
uptodate, we must have been trying to overwrite it completely
and got a short copy.  In that case, overwriting the end with
zeroes, marking uptodate and sending to server is just plain
wrong.  Just unlock, keep it non-uptodate and return 0.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>