diff options
author | Al Viro <viro@zeniv.linux.org.uk> | 2011-03-18 15:55:38 +0300 |
---|---|---|
committer | Al Viro <viro@zeniv.linux.org.uk> | 2011-03-18 15:55:38 +0300 |
commit | b12cea9198fa99ffd3de1776c323bc7464d26b44 (patch) | |
tree | 3ae5818b2690e45c8a71432ed681751683091287 /fs/nfsd | |
parent | 27cb1572e3e6bb1f8cf6bb3d74c914a87b131792 (diff) | |
download | linux-b12cea9198fa99ffd3de1776c323bc7464d26b44.tar.xz |
change the locking order for namespace_sem
Have it nested inside ->i_mutex. Instead of using follow_down()
under namespace_sem, followed by grabbing i_mutex and checking that
mountpoint to be is not dead, do the following:
grab i_mutex
check that it's not dead
grab namespace_sem
see if anything is mounted there
if not, we've won
otherwise
drop locks
put_path on what we had
replace with what's mounted
retry everything with new mountpoint to be
New helper (lock_mount()) does that. do_add_mount(), do_move_mount(),
do_loopback() and pivot_root() switched to it; in case of the last
two that eliminates a race we used to have - original code didn't
do follow_down().
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/nfsd')
0 files changed, 0 insertions, 0 deletions