tree fb899d7da5e5774c102a70692fac779018b29df6
parent 836dc9e3fbbab0c30aa6e664417225f5c1fb1c39
author Al Viro <viro@ZenIV.linux.org.uk> 1359159096 +0000
committer Eric Van Hensbergen <ericvh@gmail.com> 1360535373 -0600

locking in fs/9p ->readdir()

	... is really excessive.  First of all, ->readdir() is serialized by
file->f_path.dentry->d_inode->i_mutex; playing with file->f_path.dentry->d_lock
is not buying you anything.  Moreover, rdir->mutex is pointless for exactly
the same reason - you'll never see contention on it.

	While we are at it, there's no point in having rdir->buf a pointer -
you have it point just past the end of rdir, so it might as well be a flex
array (and no, it's not a gccism).

	Absolutely untested patch follows:

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>