forked from Minki/linux
af558e33be
Rewrite grace period code to unify management of grace period across lockd and nfsd. The current code has lockd and nfsd cooperate to compute a grace period which is satisfactory to them both, and then individually enforce it. This creates a slight race condition, since the enforcement is not coordinated. It's also more complicated than necessary. Here instead we have lockd and nfsd each inform common code when they enter the grace period, and when they're ready to leave the grace period, and allow normal locking only after both of them are ready to leave. We also expect the locks_start_grace()/locks_end_grace() interface here to be simpler to build on for future cluster/high-availability work, which may require (for example) putting individual filesystems into grace, or enforcing grace periods across multiple cluster nodes. Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
534 lines
15 KiB
C
534 lines
15 KiB
C
/*
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* linux/fs/lockd/svc4proc.c
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*
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* Lockd server procedures. We don't implement the NLM_*_RES
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* procedures because we don't use the async procedures.
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*
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* Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
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*/
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#include <linux/types.h>
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#include <linux/time.h>
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#include <linux/slab.h>
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#include <linux/in.h>
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#include <linux/sunrpc/svc.h>
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#include <linux/sunrpc/clnt.h>
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#include <linux/nfsd/nfsd.h>
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#include <linux/lockd/lockd.h>
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#include <linux/lockd/share.h>
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#include <linux/lockd/sm_inter.h>
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#define NLMDBG_FACILITY NLMDBG_CLIENT
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/*
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* Obtain client and file from arguments
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*/
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static __be32
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nlm4svc_retrieve_args(struct svc_rqst *rqstp, struct nlm_args *argp,
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struct nlm_host **hostp, struct nlm_file **filp)
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{
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struct nlm_host *host = NULL;
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struct nlm_file *file = NULL;
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struct nlm_lock *lock = &argp->lock;
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__be32 error = 0;
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/* nfsd callbacks must have been installed for this procedure */
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if (!nlmsvc_ops)
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return nlm_lck_denied_nolocks;
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/* Obtain host handle */
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if (!(host = nlmsvc_lookup_host(rqstp, lock->caller, lock->len))
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|| (argp->monitor && nsm_monitor(host) < 0))
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goto no_locks;
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*hostp = host;
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/* Obtain file pointer. Not used by FREE_ALL call. */
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if (filp != NULL) {
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if ((error = nlm_lookup_file(rqstp, &file, &lock->fh)) != 0)
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goto no_locks;
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*filp = file;
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/* Set up the missing parts of the file_lock structure */
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lock->fl.fl_file = file->f_file;
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lock->fl.fl_owner = (fl_owner_t) host;
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lock->fl.fl_lmops = &nlmsvc_lock_operations;
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}
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return 0;
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no_locks:
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nlm_release_host(host);
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if (error)
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return error;
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return nlm_lck_denied_nolocks;
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}
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/*
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* NULL: Test for presence of service
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*/
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static __be32
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nlm4svc_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
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{
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dprintk("lockd: NULL called\n");
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return rpc_success;
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}
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/*
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* TEST: Check for conflicting lock
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*/
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static __be32
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nlm4svc_proc_test(struct svc_rqst *rqstp, struct nlm_args *argp,
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struct nlm_res *resp)
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{
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struct nlm_host *host;
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struct nlm_file *file;
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__be32 rc = rpc_success;
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dprintk("lockd: TEST4 called\n");
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resp->cookie = argp->cookie;
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/* Don't accept test requests during grace period */
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if (locks_in_grace()) {
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resp->status = nlm_lck_denied_grace_period;
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return rc;
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}
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/* Obtain client and file */
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if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
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return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
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/* Now check for conflicting locks */
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resp->status = nlmsvc_testlock(rqstp, file, host, &argp->lock, &resp->lock, &resp->cookie);
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if (resp->status == nlm_drop_reply)
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rc = rpc_drop_reply;
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else
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dprintk("lockd: TEST4 status %d\n", ntohl(resp->status));
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nlm_release_host(host);
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nlm_release_file(file);
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return rc;
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}
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static __be32
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nlm4svc_proc_lock(struct svc_rqst *rqstp, struct nlm_args *argp,
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struct nlm_res *resp)
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{
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struct nlm_host *host;
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struct nlm_file *file;
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__be32 rc = rpc_success;
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dprintk("lockd: LOCK called\n");
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resp->cookie = argp->cookie;
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/* Don't accept new lock requests during grace period */
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if (locks_in_grace() && !argp->reclaim) {
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resp->status = nlm_lck_denied_grace_period;
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return rc;
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}
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/* Obtain client and file */
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if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
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return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
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#if 0
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/* If supplied state doesn't match current state, we assume it's
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* an old request that time-warped somehow. Any error return would
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* do in this case because it's irrelevant anyway.
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*
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* NB: We don't retrieve the remote host's state yet.
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*/
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if (host->h_nsmstate && host->h_nsmstate != argp->state) {
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resp->status = nlm_lck_denied_nolocks;
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} else
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#endif
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/* Now try to lock the file */
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resp->status = nlmsvc_lock(rqstp, file, host, &argp->lock,
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argp->block, &argp->cookie);
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if (resp->status == nlm_drop_reply)
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rc = rpc_drop_reply;
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else
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dprintk("lockd: LOCK status %d\n", ntohl(resp->status));
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nlm_release_host(host);
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nlm_release_file(file);
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return rc;
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}
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static __be32
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nlm4svc_proc_cancel(struct svc_rqst *rqstp, struct nlm_args *argp,
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struct nlm_res *resp)
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{
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struct nlm_host *host;
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struct nlm_file *file;
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dprintk("lockd: CANCEL called\n");
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resp->cookie = argp->cookie;
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/* Don't accept requests during grace period */
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if (locks_in_grace()) {
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resp->status = nlm_lck_denied_grace_period;
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return rpc_success;
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}
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/* Obtain client and file */
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if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
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return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
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/* Try to cancel request. */
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resp->status = nlmsvc_cancel_blocked(file, &argp->lock);
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dprintk("lockd: CANCEL status %d\n", ntohl(resp->status));
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nlm_release_host(host);
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nlm_release_file(file);
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return rpc_success;
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}
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/*
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* UNLOCK: release a lock
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*/
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static __be32
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nlm4svc_proc_unlock(struct svc_rqst *rqstp, struct nlm_args *argp,
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struct nlm_res *resp)
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{
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struct nlm_host *host;
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struct nlm_file *file;
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dprintk("lockd: UNLOCK called\n");
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resp->cookie = argp->cookie;
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/* Don't accept new lock requests during grace period */
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if (locks_in_grace()) {
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resp->status = nlm_lck_denied_grace_period;
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return rpc_success;
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}
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/* Obtain client and file */
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if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
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return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
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/* Now try to remove the lock */
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resp->status = nlmsvc_unlock(file, &argp->lock);
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dprintk("lockd: UNLOCK status %d\n", ntohl(resp->status));
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nlm_release_host(host);
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nlm_release_file(file);
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return rpc_success;
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}
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/*
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* GRANTED: A server calls us to tell that a process' lock request
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* was granted
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*/
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static __be32
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nlm4svc_proc_granted(struct svc_rqst *rqstp, struct nlm_args *argp,
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struct nlm_res *resp)
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{
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resp->cookie = argp->cookie;
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dprintk("lockd: GRANTED called\n");
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resp->status = nlmclnt_grant(svc_addr_in(rqstp), &argp->lock);
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dprintk("lockd: GRANTED status %d\n", ntohl(resp->status));
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return rpc_success;
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}
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/*
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* This is the generic lockd callback for async RPC calls
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*/
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static void nlm4svc_callback_exit(struct rpc_task *task, void *data)
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{
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dprintk("lockd: %5u callback returned %d\n", task->tk_pid,
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-task->tk_status);
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}
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static void nlm4svc_callback_release(void *data)
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{
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lock_kernel();
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nlm_release_call(data);
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unlock_kernel();
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}
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static const struct rpc_call_ops nlm4svc_callback_ops = {
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.rpc_call_done = nlm4svc_callback_exit,
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.rpc_release = nlm4svc_callback_release,
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};
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/*
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* `Async' versions of the above service routines. They aren't really,
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* because we send the callback before the reply proper. I hope this
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* doesn't break any clients.
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*/
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static __be32 nlm4svc_callback(struct svc_rqst *rqstp, u32 proc, struct nlm_args *argp,
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__be32 (*func)(struct svc_rqst *, struct nlm_args *, struct nlm_res *))
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{
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struct nlm_host *host;
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struct nlm_rqst *call;
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__be32 stat;
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host = nlmsvc_lookup_host(rqstp,
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argp->lock.caller,
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argp->lock.len);
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if (host == NULL)
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return rpc_system_err;
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call = nlm_alloc_call(host);
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if (call == NULL)
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return rpc_system_err;
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stat = func(rqstp, argp, &call->a_res);
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if (stat != 0) {
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nlm_release_call(call);
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return stat;
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}
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call->a_flags = RPC_TASK_ASYNC;
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if (nlm_async_reply(call, proc, &nlm4svc_callback_ops) < 0)
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return rpc_system_err;
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return rpc_success;
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}
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static __be32 nlm4svc_proc_test_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
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void *resp)
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{
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dprintk("lockd: TEST_MSG called\n");
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return nlm4svc_callback(rqstp, NLMPROC_TEST_RES, argp, nlm4svc_proc_test);
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}
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static __be32 nlm4svc_proc_lock_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
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void *resp)
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{
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dprintk("lockd: LOCK_MSG called\n");
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return nlm4svc_callback(rqstp, NLMPROC_LOCK_RES, argp, nlm4svc_proc_lock);
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}
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static __be32 nlm4svc_proc_cancel_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
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void *resp)
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{
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dprintk("lockd: CANCEL_MSG called\n");
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return nlm4svc_callback(rqstp, NLMPROC_CANCEL_RES, argp, nlm4svc_proc_cancel);
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}
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static __be32 nlm4svc_proc_unlock_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
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void *resp)
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{
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dprintk("lockd: UNLOCK_MSG called\n");
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return nlm4svc_callback(rqstp, NLMPROC_UNLOCK_RES, argp, nlm4svc_proc_unlock);
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}
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static __be32 nlm4svc_proc_granted_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
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void *resp)
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{
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dprintk("lockd: GRANTED_MSG called\n");
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return nlm4svc_callback(rqstp, NLMPROC_GRANTED_RES, argp, nlm4svc_proc_granted);
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}
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/*
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* SHARE: create a DOS share or alter existing share.
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*/
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static __be32
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nlm4svc_proc_share(struct svc_rqst *rqstp, struct nlm_args *argp,
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struct nlm_res *resp)
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{
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struct nlm_host *host;
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struct nlm_file *file;
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dprintk("lockd: SHARE called\n");
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resp->cookie = argp->cookie;
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/* Don't accept new lock requests during grace period */
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if (locks_in_grace() && !argp->reclaim) {
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resp->status = nlm_lck_denied_grace_period;
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return rpc_success;
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}
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/* Obtain client and file */
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if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
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return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
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/* Now try to create the share */
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resp->status = nlmsvc_share_file(host, file, argp);
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dprintk("lockd: SHARE status %d\n", ntohl(resp->status));
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nlm_release_host(host);
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nlm_release_file(file);
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return rpc_success;
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}
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/*
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* UNSHARE: Release a DOS share.
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*/
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static __be32
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nlm4svc_proc_unshare(struct svc_rqst *rqstp, struct nlm_args *argp,
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struct nlm_res *resp)
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{
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struct nlm_host *host;
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struct nlm_file *file;
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dprintk("lockd: UNSHARE called\n");
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resp->cookie = argp->cookie;
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/* Don't accept requests during grace period */
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if (locks_in_grace()) {
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resp->status = nlm_lck_denied_grace_period;
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return rpc_success;
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}
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/* Obtain client and file */
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if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
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return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
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/* Now try to lock the file */
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resp->status = nlmsvc_unshare_file(host, file, argp);
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dprintk("lockd: UNSHARE status %d\n", ntohl(resp->status));
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nlm_release_host(host);
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nlm_release_file(file);
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return rpc_success;
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}
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/*
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* NM_LOCK: Create an unmonitored lock
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*/
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static __be32
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nlm4svc_proc_nm_lock(struct svc_rqst *rqstp, struct nlm_args *argp,
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struct nlm_res *resp)
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{
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dprintk("lockd: NM_LOCK called\n");
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argp->monitor = 0; /* just clean the monitor flag */
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return nlm4svc_proc_lock(rqstp, argp, resp);
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}
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/*
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* FREE_ALL: Release all locks and shares held by client
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*/
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static __be32
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nlm4svc_proc_free_all(struct svc_rqst *rqstp, struct nlm_args *argp,
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void *resp)
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{
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struct nlm_host *host;
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/* Obtain client */
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if (nlm4svc_retrieve_args(rqstp, argp, &host, NULL))
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return rpc_success;
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nlmsvc_free_host_resources(host);
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nlm_release_host(host);
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return rpc_success;
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}
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/*
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* SM_NOTIFY: private callback from statd (not part of official NLM proto)
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*/
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static __be32
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nlm4svc_proc_sm_notify(struct svc_rqst *rqstp, struct nlm_reboot *argp,
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void *resp)
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{
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struct sockaddr_in saddr;
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memcpy(&saddr, svc_addr_in(rqstp), sizeof(saddr));
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dprintk("lockd: SM_NOTIFY called\n");
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if (saddr.sin_addr.s_addr != htonl(INADDR_LOOPBACK)
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|| ntohs(saddr.sin_port) >= 1024) {
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char buf[RPC_MAX_ADDRBUFLEN];
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printk(KERN_WARNING "lockd: rejected NSM callback from %s\n",
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svc_print_addr(rqstp, buf, sizeof(buf)));
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return rpc_system_err;
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}
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/* Obtain the host pointer for this NFS server and try to
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* reclaim all locks we hold on this server.
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*/
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memset(&saddr, 0, sizeof(saddr));
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saddr.sin_addr.s_addr = argp->addr;
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nlm_host_rebooted(&saddr, argp->mon, argp->len, argp->state);
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return rpc_success;
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}
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/*
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* client sent a GRANTED_RES, let's remove the associated block
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*/
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static __be32
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nlm4svc_proc_granted_res(struct svc_rqst *rqstp, struct nlm_res *argp,
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void *resp)
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{
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if (!nlmsvc_ops)
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return rpc_success;
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dprintk("lockd: GRANTED_RES called\n");
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nlmsvc_grant_reply(&argp->cookie, argp->status);
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return rpc_success;
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}
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/*
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* NLM Server procedures.
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*/
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#define nlm4svc_encode_norep nlm4svc_encode_void
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#define nlm4svc_decode_norep nlm4svc_decode_void
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#define nlm4svc_decode_testres nlm4svc_decode_void
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#define nlm4svc_decode_lockres nlm4svc_decode_void
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#define nlm4svc_decode_unlockres nlm4svc_decode_void
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#define nlm4svc_decode_cancelres nlm4svc_decode_void
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#define nlm4svc_decode_grantedres nlm4svc_decode_void
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#define nlm4svc_proc_none nlm4svc_proc_null
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#define nlm4svc_proc_test_res nlm4svc_proc_null
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#define nlm4svc_proc_lock_res nlm4svc_proc_null
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#define nlm4svc_proc_cancel_res nlm4svc_proc_null
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#define nlm4svc_proc_unlock_res nlm4svc_proc_null
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struct nlm_void { int dummy; };
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#define PROC(name, xargt, xrest, argt, rest, respsize) \
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{ .pc_func = (svc_procfunc) nlm4svc_proc_##name, \
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.pc_decode = (kxdrproc_t) nlm4svc_decode_##xargt, \
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.pc_encode = (kxdrproc_t) nlm4svc_encode_##xrest, \
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.pc_release = NULL, \
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.pc_argsize = sizeof(struct nlm_##argt), \
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.pc_ressize = sizeof(struct nlm_##rest), \
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.pc_xdrressize = respsize, \
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}
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#define Ck (1+XDR_QUADLEN(NLM_MAXCOOKIELEN)) /* cookie */
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#define No (1+1024/4) /* netobj */
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#define St 1 /* status */
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#define Rg 4 /* range (offset + length) */
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struct svc_procedure nlmsvc_procedures4[] = {
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PROC(null, void, void, void, void, 1),
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PROC(test, testargs, testres, args, res, Ck+St+2+No+Rg),
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PROC(lock, lockargs, res, args, res, Ck+St),
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PROC(cancel, cancargs, res, args, res, Ck+St),
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PROC(unlock, unlockargs, res, args, res, Ck+St),
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PROC(granted, testargs, res, args, res, Ck+St),
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PROC(test_msg, testargs, norep, args, void, 1),
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PROC(lock_msg, lockargs, norep, args, void, 1),
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PROC(cancel_msg, cancargs, norep, args, void, 1),
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PROC(unlock_msg, unlockargs, norep, args, void, 1),
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PROC(granted_msg, testargs, norep, args, void, 1),
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PROC(test_res, testres, norep, res, void, 1),
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PROC(lock_res, lockres, norep, res, void, 1),
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PROC(cancel_res, cancelres, norep, res, void, 1),
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PROC(unlock_res, unlockres, norep, res, void, 1),
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PROC(granted_res, res, norep, res, void, 1),
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/* statd callback */
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PROC(sm_notify, reboot, void, reboot, void, 1),
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PROC(none, void, void, void, void, 0),
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PROC(none, void, void, void, void, 0),
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PROC(none, void, void, void, void, 0),
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PROC(share, shareargs, shareres, args, res, Ck+St+1),
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PROC(unshare, shareargs, shareres, args, res, Ck+St+1),
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PROC(nm_lock, lockargs, res, args, res, Ck+St),
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PROC(free_all, notify, void, args, void, 1),
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};
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