From 9b07357490e5c7a1c3c2b6f4679d7ee4b4185ecd Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Thu, 29 Jun 2006 16:38:34 -0400 Subject: NLM,NFSv4: Don't put UNLOCK requests on the wire unless we hold a lock Use the new behaviour of {flock,posix}_file_lock(F_UNLCK) to determine if we held a lock, and only send the RPC request to the server if this was the case. Signed-off-by: Trond Myklebust --- fs/lockd/clntproc.c | 18 ++++++++++-------- 1 file changed, 10 insertions(+), 8 deletions(-) (limited to 'fs/lockd/clntproc.c') diff --git a/fs/lockd/clntproc.c b/fs/lockd/clntproc.c index 5980c45998cc..24c691f5480e 100644 --- a/fs/lockd/clntproc.c +++ b/fs/lockd/clntproc.c @@ -454,7 +454,7 @@ static void nlmclnt_locks_init_private(struct file_lock *fl, struct nlm_host *ho fl->fl_ops = &nlmclnt_lock_ops; } -static void do_vfs_lock(struct file_lock *fl) +static int do_vfs_lock(struct file_lock *fl) { int res = 0; switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) { @@ -467,9 +467,7 @@ static void do_vfs_lock(struct file_lock *fl) default: BUG(); } - if (res < 0) - printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", - __FUNCTION__); + return res; } /* @@ -541,7 +539,8 @@ again: } fl->fl_flags |= FL_SLEEP; /* Ensure the resulting lock will get added to granted list */ - do_vfs_lock(fl); + if (do_vfs_lock(fl) < 0) + printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __FUNCTION__); up_read(&host->h_rwsem); } status = nlm_stat_to_errno(resp->status); @@ -606,15 +605,19 @@ nlmclnt_unlock(struct nlm_rqst *req, struct file_lock *fl) { struct nlm_host *host = req->a_host; struct nlm_res *resp = &req->a_res; - int status; + int status = 0; /* * Note: the server is supposed to either grant us the unlock * request, or to deny it with NLM_LCK_DENIED_GRACE_PERIOD. In either * case, we want to unlock. */ + fl->fl_flags |= FL_EXISTS; down_read(&host->h_rwsem); - do_vfs_lock(fl); + if (do_vfs_lock(fl) == -ENOENT) { + up_read(&host->h_rwsem); + goto out; + } up_read(&host->h_rwsem); if (req->a_flags & RPC_TASK_ASYNC) @@ -624,7 +627,6 @@ nlmclnt_unlock(struct nlm_rqst *req, struct file_lock *fl) if (status < 0) goto out; - status = 0; if (resp->status == NLM_LCK_GRANTED) goto out; -- cgit v1.2.3 From 01c3b861cd77b28565a2d18c7caa3ce7f938e35c Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Thu, 29 Jun 2006 16:38:39 -0400 Subject: NLM,NFSv4: Wait on local locks before we put RPC calls on the wire Use FL_ACCESS flag to test and/or wait for local locks before we try requesting a lock from the server Signed-off-by: Trond Myklebust --- fs/lockd/clntproc.c | 8 +++++++- fs/nfs/nfs4proc.c | 35 ++++++++++++++++++++++++----------- 2 files changed, 31 insertions(+), 12 deletions(-) (limited to 'fs/lockd/clntproc.c') diff --git a/fs/lockd/clntproc.c b/fs/lockd/clntproc.c index 24c691f5480e..89ba0df14c22 100644 --- a/fs/lockd/clntproc.c +++ b/fs/lockd/clntproc.c @@ -496,6 +496,7 @@ nlmclnt_lock(struct nlm_rqst *req, struct file_lock *fl) struct nlm_host *host = req->a_host; struct nlm_res *resp = &req->a_res; struct nlm_wait *block = NULL; + unsigned char fl_flags = fl->fl_flags; int status = -ENOLCK; if (!host->h_monitored && nsm_monitor(host) < 0) { @@ -503,6 +504,10 @@ nlmclnt_lock(struct nlm_rqst *req, struct file_lock *fl) host->h_name); goto out; } + fl->fl_flags |= FL_ACCESS; + status = do_vfs_lock(fl); + if (status < 0) + goto out; block = nlmclnt_prepare_block(host, fl); again: @@ -537,8 +542,8 @@ again: up_read(&host->h_rwsem); goto again; } - fl->fl_flags |= FL_SLEEP; /* Ensure the resulting lock will get added to granted list */ + fl->fl_flags = fl_flags | FL_SLEEP; if (do_vfs_lock(fl) < 0) printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __FUNCTION__); up_read(&host->h_rwsem); @@ -551,6 +556,7 @@ out_unblock: nlmclnt_cancel(host, req->a_args.block, fl); out: nlm_release_call(req); + fl->fl_flags = fl_flags; return status; } diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c index 8bdfe3ff7925..e6ee97f19d81 100644 --- a/fs/nfs/nfs4proc.c +++ b/fs/nfs/nfs4proc.c @@ -3489,29 +3489,42 @@ static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) { struct nfs4_client *clp = state->owner->so_client; + unsigned char fl_flags = request->fl_flags; int status; /* Is this a delegated open? */ - if (NFS_I(state->inode)->delegation_state != 0) { - /* Yes: cache locks! */ - status = do_vfs_lock(request->fl_file, request); - /* ...but avoid races with delegation recall... */ - if (status < 0 || test_bit(NFS_DELEGATED_STATE, &state->flags)) - return status; - } - down_read(&clp->cl_sem); status = nfs4_set_lock_state(state, request); if (status != 0) goto out; + request->fl_flags |= FL_ACCESS; + status = do_vfs_lock(request->fl_file, request); + if (status < 0) + goto out; + down_read(&clp->cl_sem); + if (test_bit(NFS_DELEGATED_STATE, &state->flags)) { + struct nfs_inode *nfsi = NFS_I(state->inode); + /* Yes: cache locks! */ + down_read(&nfsi->rwsem); + /* ...but avoid races with delegation recall... */ + if (test_bit(NFS_DELEGATED_STATE, &state->flags)) { + request->fl_flags = fl_flags & ~FL_SLEEP; + status = do_vfs_lock(request->fl_file, request); + up_read(&nfsi->rwsem); + goto out_unlock; + } + up_read(&nfsi->rwsem); + } status = _nfs4_do_setlk(state, cmd, request, 0); if (status != 0) - goto out; + goto out_unlock; /* Note: we always want to sleep here! */ - request->fl_flags |= FL_SLEEP; + request->fl_flags = fl_flags | FL_SLEEP; if (do_vfs_lock(request->fl_file, request) < 0) printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __FUNCTION__); -out: +out_unlock: up_read(&clp->cl_sem); +out: + request->fl_flags = fl_flags; return status; } -- cgit v1.2.3