diff options
author | Jeff Layton <jlayton@redhat.com> | 2016-09-16 16:28:25 -0400 |
---|---|---|
committer | J. Bruce Fields <bfields@redhat.com> | 2016-09-26 15:20:36 -0400 |
commit | 7919d0a27f1e7cb324e023776aa1cbff00f1ee7b (patch) | |
tree | 49ad90bf5a85f3c5ee3b0814be8902c3186614ec /fs/nfsd/netns.h | |
parent | 76d348fadff52e8ad10e7f587a4560df79a5fefe (diff) |
nfsd: add a LRU list for blocked locks
It's possible for a client to call in on a lock that is blocked for a
long time, but discontinue polling for it. A malicious client could
even set a lock on a file, and then spam the server with failing lock
requests from different lockowners that pile up in a DoS attack.
Add the blocked lock structures to a per-net namespace LRU when hashing
them, and timestamp them. If the lock request is not revisited after a
lease period, we'll drop it under the assumption that the client is no
longer interested.
This also gives us a mechanism to clean up these objects at server
shutdown time as well.
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Diffstat (limited to 'fs/nfsd/netns.h')
-rw-r--r-- | fs/nfsd/netns.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/nfsd/netns.h b/fs/nfsd/netns.h index 5fbf3bbd00d0..b10d557f9c9e 100644 --- a/fs/nfsd/netns.h +++ b/fs/nfsd/netns.h @@ -84,6 +84,7 @@ struct nfsd_net { struct list_head client_lru; struct list_head close_lru; struct list_head del_recall_lru; + struct list_head blocked_locks_lru; struct delayed_work laundromat_work; |