tree 0ad94849a7bc3e97cd19978005d1898c8bb44b36
parent f9dbd05bc97d1d4f17c2057612f6a8e4dbd039e0
author Al Viro <viro@zeniv.linux.org.uk> 1241813157 -0400
committer Al Viro <viro@zeniv.linux.org.uk> 1241880694 -0400

Fix races around the access to ->s_options

Put generic_show_options read access to s_options under rcu_read_lock,
split save_mount_options() into "we are setting it the first time"
(uses in foo_fill_super()) and "we are relacing and freeing the old one",
synchronize_rcu() before kfree() in the latter.

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