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authorJeff Layton <jlayton@redhat.com>2016-09-16 23:28:25 +0300
committerJ. Bruce Fields <bfields@redhat.com>2016-09-26 22:20:36 +0300
commit7919d0a27f1e7cb324e023776aa1cbff00f1ee7b (patch)
tree49ad90bf5a85f3c5ee3b0814be8902c3186614ec /fs/nfsd/state.h
parent76d348fadff52e8ad10e7f587a4560df79a5fefe (diff)
downloadlinux-7919d0a27f1e7cb324e023776aa1cbff00f1ee7b.tar.xz
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/state.h')
-rw-r--r--fs/nfsd/state.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/nfsd/state.h b/fs/nfsd/state.h
index e45c183a8bf7..c9399366f9df 100644
--- a/fs/nfsd/state.h
+++ b/fs/nfsd/state.h
@@ -587,6 +587,8 @@ static inline bool nfsd4_stateid_generation_after(stateid_t *a, stateid_t *b)
*/
struct nfsd4_blocked_lock {
struct list_head nbl_list;
+ struct list_head nbl_lru;
+ unsigned long nbl_time;
struct file_lock nbl_lock;
struct knfsd_fh nbl_fh;
struct nfsd4_callback nbl_cb;