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lockd: add code to handle deferred lock requests

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Rewrite nlmsvc_lock() to use the asynchronous interface.

As with testlock, we answer nlm requests in nlmsvc_lock by first looking up
the block and then using the results we find in the block if B_QUEUED is
set, and calling vfs_lock_file() otherwise.

If this a new lock request and we get -EINPROGRESS return on a non-blocking
request then we defer the request.

Also modify nlmsvc_unlock() to call the filesystem method if appropriate.

Signed-off-by: Marc Eshel <eshel@almaden.ibm.com>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
This commit is contained in:
Marc Eshel
2006-11-28 16:27:06 -05:00
committed by J. Bruce Fields
parent f812048020
commit 1a8322b2b0
4 changed files with 40 additions and 7 deletions
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2
fs/lockd/svc4proc.c
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@@ -145,6 +145,8 @@ nlm4svc_proc_lock(struct svc_rqst *rqstp, struct nlm_args *argp,
/* Now try to lock the file */
resp->status = nlmsvc_lock(rqstp, file, &argp->lock,
argp->block, &argp->cookie);
if (resp->status == nlm_drop_reply)
return rpc_drop_reply;
dprintk("lockd: LOCK status %d\n", ntohl(resp->status));
nlm_release_host(host);