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authorChristoph Hellwig <hch@lst.de>2006-03-20 13:44:40 -0500
committerTrond Myklebust <Trond.Myklebust@netapp.com>2006-03-20 13:44:40 -0500
commit26bcbf965f857c710adafd16cf424f043006b5dd (patch)
treefa3c1e4ba07ab3d1e4e61b27c7579c57fd2d5c65 /fs/lockd/clntproc.c
parent04266473ecf5cdca242201d9f1ed890afe070fb6 (diff)
downloadop-kernel-dev-26bcbf965f857c710adafd16cf424f043006b5dd.zip
op-kernel-dev-26bcbf965f857c710adafd16cf424f043006b5dd.tar.gz
lockd: stop abusing file_lock_list
Currently lockd directly access the file_lock_list from fs/locks.c. It does so to mark locks granted or reclaimable. This is very suboptimal, because a) lockd needs to poke into locks.c internals, and b) it needs to iterate over all locks in the system for marking locks granted or reclaimable. This patch adds lists for granted and reclaimable locks to the nlm_host structure instead, and adds locks to those. nlmclnt_lock: now adds the lock to h_granted instead of setting the NFS_LCK_GRANTED, still O(1) nlmclnt_mark_reclaim: goes away completely, replaced by a list_splice_init. Complexity reduced from O(locks in the system) to O(1) reclaimer: iterates over h_reclaim now, complexity reduced from O(locks in the system) to O(locks per nlm_host) Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'fs/lockd/clntproc.c')
-rw-r--r--fs/lockd/clntproc.c11
1 files changed, 6 insertions, 5 deletions
diff --git a/fs/lockd/clntproc.c b/fs/lockd/clntproc.c
index 80ae312..cb46943 100644
--- a/fs/lockd/clntproc.c
+++ b/fs/lockd/clntproc.c
@@ -465,7 +465,6 @@ static void nlmclnt_locks_init_private(struct file_lock *fl, struct nlm_host *ho
{
BUG_ON(fl->fl_ops != NULL);
fl->fl_u.nfs_fl.state = 0;
- fl->fl_u.nfs_fl.flags = 0;
fl->fl_u.nfs_fl.owner = nlm_find_lockowner(host, fl->fl_owner);
fl->fl_ops = &nlmclnt_lock_ops;
}
@@ -552,8 +551,8 @@ nlmclnt_lock(struct nlm_rqst *req, struct file_lock *fl)
if (resp->status == NLM_LCK_GRANTED) {
fl->fl_u.nfs_fl.state = host->h_state;
- fl->fl_u.nfs_fl.flags |= NFS_LCK_GRANTED;
fl->fl_flags |= FL_SLEEP;
+ list_add_tail(&fl->fl_u.nfs_fl.list, &host->h_granted);
do_vfs_lock(fl);
}
status = nlm_stat_to_errno(resp->status);
@@ -619,9 +618,11 @@ nlmclnt_unlock(struct nlm_rqst *req, struct file_lock *fl)
struct nlm_res *resp = &req->a_res;
int status;
- /* Clean the GRANTED flag now so the lock doesn't get
- * reclaimed while we're stuck in the unlock call. */
- fl->fl_u.nfs_fl.flags &= ~NFS_LCK_GRANTED;
+ /*
+ * Remove from the granted list now so the lock doesn't get
+ * reclaimed while we're stuck in the unlock call.
+ */
+ list_del(&fl->fl_u.nfs_fl.list);
/*
* Note: the server is supposed to either grant us the unlock
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