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NLM,NFSv4: Wait on local locks before we put RPC calls on the wire

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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 <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust 2006-06-29 16:38:39 -04:00
parent f07f18dd6f
commit 01c3b861cd
2 changed files with 31 additions and 12 deletions
Download patch file Download diff file Expand all files Collapse all files

8
fs/lockd/clntproc.c
View file

@ -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;
}