[PATCH v2 12/15] LockD: pass actual network namespace to grace periodmanagement functions

From: Stanislav Kinsbursky
Date: Wed Jul 25 2012 - 08:58:44 EST

Passed network namespace replaced hard-coded init_net

Signed-off-by: Stanislav Kinsbursky <skinsbursky@xxxxxxxxxxxxx>
---
fs/lockd/grace.c | 6 ++----
fs/lockd/svc.c | 16 +++++++++-------
fs/lockd/svc4proc.c | 13 +++++++------
fs/lockd/svclock.c | 16 ++++++++--------
fs/lockd/svcproc.c | 15 +++++++++------
fs/nfsd/nfs4proc.c | 18 ++++++++++--------
fs/nfsd/nfs4state.c | 29 +++++++++++++++--------------
fs/nfsd/state.h | 3 ++-
include/linux/fs.h | 5 +++--
include/linux/lockd/lockd.h | 4 ++--
10 files changed, 67 insertions(+), 58 deletions(-)

diff --git a/fs/lockd/grace.c b/fs/lockd/grace.c
index 8dbaff7..6d1ee72 100644
--- a/fs/lockd/grace.c
+++ b/fs/lockd/grace.c
@@ -21,9 +21,8 @@ static DEFINE_SPINLOCK(grace_lock);
*
* This function is called to start a grace period.
*/
-void locks_start_grace(struct lock_manager *lm)
+void locks_start_grace(struct net *net, struct lock_manager *lm)
{
- struct net *net = &init_net;
struct lockd_net *ln = net_generic(net, lockd_net_id);

spin_lock(&grace_lock);
@@ -57,9 +56,8 @@ EXPORT_SYMBOL_GPL(locks_end_grace);
* to answer ordinary lock requests, and when they should accept only
* lock reclaims.
*/
-int locks_in_grace(void)
+int locks_in_grace(struct net *net)
{
- struct net *net = &init_net;
struct lockd_net *ln = net_generic(net, lockd_net_id);

return !list_empty(&ln->grace_list);
diff --git a/fs/lockd/svc.c b/fs/lockd/svc.c
index 834dfe2..68271c2 100644
--- a/fs/lockd/svc.c
+++ b/fs/lockd/svc.c
@@ -97,12 +97,12 @@ static void grace_ender(struct work_struct *grace)
locks_end_grace(&ln->lockd_manager);
}

-static void set_grace_period(void)
+static void set_grace_period(struct net *net)
{
unsigned long grace_period = get_lockd_grace_period();
- struct lockd_net *ln = net_generic(&init_net, lockd_net_id);
+ struct lockd_net *ln = net_generic(net, lockd_net_id);

- locks_start_grace(&ln->lockd_manager);
+ locks_start_grace(net, &ln->lockd_manager);
cancel_delayed_work_sync(&ln->grace_period_end);
schedule_delayed_work(&ln->grace_period_end, grace_period);
}
@@ -110,12 +110,13 @@ static void set_grace_period(void)
static void restart_grace(void)
{
if (nlmsvc_ops) {
- struct lockd_net *ln = net_generic(&init_net, lockd_net_id);
+ struct net *net = &init_net;
+ struct lockd_net *ln = net_generic(net, lockd_net_id);

cancel_delayed_work_sync(&ln->grace_period_end);
locks_end_grace(&ln->lockd_manager);
nlmsvc_invalidate_all();
- set_grace_period();
+ set_grace_period(net);
}
}

@@ -127,7 +128,8 @@ lockd(void *vrqstp)
{
int err = 0, preverr = 0;
struct svc_rqst *rqstp = vrqstp;
- struct lockd_net *ln = net_generic(&init_net, lockd_net_id);
+ struct net *net = &init_net;
+ struct lockd_net *ln = net_generic(net, lockd_net_id);

/* try_to_freeze() is called from svc_recv() */
set_freezable();
@@ -141,7 +143,7 @@ lockd(void *vrqstp)
nlm_timeout = LOCKD_DFLT_TIMEO;
nlmsvc_timeout = nlm_timeout * HZ;

- set_grace_period();
+ set_grace_period(net);

/*
* The main request loop. We don't terminate until the last
diff --git a/fs/lockd/svc4proc.c b/fs/lockd/svc4proc.c
index 9a41fdc..4a43d25 100644
--- a/fs/lockd/svc4proc.c
+++ b/fs/lockd/svc4proc.c
@@ -11,6 +11,7 @@
#include <linux/time.h>
#include <linux/lockd/lockd.h>
#include <linux/lockd/share.h>
+#include <linux/sunrpc/svc_xprt.h>

#define NLMDBG_FACILITY NLMDBG_CLIENT

@@ -151,7 +152,7 @@ nlm4svc_proc_cancel(struct svc_rqst *rqstp, struct nlm_args *argp,
resp->cookie = argp->cookie;

/* Don't accept requests during grace period */
- if (locks_in_grace()) {
+ if (locks_in_grace(SVC_NET(rqstp))) {
resp->status = nlm_lck_denied_grace_period;
return rpc_success;
}
@@ -161,7 +162,7 @@ nlm4svc_proc_cancel(struct svc_rqst *rqstp, struct nlm_args *argp,
return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;

/* Try to cancel request. */
- resp->status = nlmsvc_cancel_blocked(file, &argp->lock);
+ resp->status = nlmsvc_cancel_blocked(SVC_NET(rqstp), file, &argp->lock);

dprintk("lockd: CANCEL status %d\n", ntohl(resp->status));
nlmsvc_release_host(host);
@@ -184,7 +185,7 @@ nlm4svc_proc_unlock(struct svc_rqst *rqstp, struct nlm_args *argp,
resp->cookie = argp->cookie;

/* Don't accept new lock requests during grace period */
- if (locks_in_grace()) {
+ if (locks_in_grace(SVC_NET(rqstp))) {
resp->status = nlm_lck_denied_grace_period;
return rpc_success;
}
@@ -194,7 +195,7 @@ nlm4svc_proc_unlock(struct svc_rqst *rqstp, struct nlm_args *argp,
return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;

/* Now try to remove the lock */
- resp->status = nlmsvc_unlock(file, &argp->lock);
+ resp->status = nlmsvc_unlock(SVC_NET(rqstp), file, &argp->lock);

dprintk("lockd: UNLOCK status %d\n", ntohl(resp->status));
nlmsvc_release_host(host);
@@ -321,7 +322,7 @@ nlm4svc_proc_share(struct svc_rqst *rqstp, struct nlm_args *argp,
resp->cookie = argp->cookie;

/* Don't accept new lock requests during grace period */
- if (locks_in_grace() && !argp->reclaim) {
+ if (locks_in_grace(SVC_NET(rqstp)) && !argp->reclaim) {
resp->status = nlm_lck_denied_grace_period;
return rpc_success;
}
@@ -354,7 +355,7 @@ nlm4svc_proc_unshare(struct svc_rqst *rqstp, struct nlm_args *argp,
resp->cookie = argp->cookie;

/* Don't accept requests during grace period */
- if (locks_in_grace()) {
+ if (locks_in_grace(SVC_NET(rqstp))) {
resp->status = nlm_lck_denied_grace_period;
return rpc_success;
}
diff --git a/fs/lockd/svclock.c b/fs/lockd/svclock.c
index e46353f..afe4488 100644
--- a/fs/lockd/svclock.c
+++ b/fs/lockd/svclock.c
@@ -26,7 +26,7 @@
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/sunrpc/clnt.h>
-#include <linux/sunrpc/svc.h>
+#include <linux/sunrpc/svc_xprt.h>
#include <linux/lockd/nlm.h>
#include <linux/lockd/lockd.h>
#include <linux/kthread.h>
@@ -447,11 +447,11 @@ nlmsvc_lock(struct svc_rqst *rqstp, struct nlm_file *file,
goto out;
}

- if (locks_in_grace() && !reclaim) {
+ if (locks_in_grace(SVC_NET(rqstp)) && !reclaim) {
ret = nlm_lck_denied_grace_period;
goto out;
}
- if (reclaim && !locks_in_grace()) {
+ if (reclaim && !locks_in_grace(SVC_NET(rqstp))) {
ret = nlm_lck_denied_grace_period;
goto out;
}
@@ -559,7 +559,7 @@ nlmsvc_testlock(struct svc_rqst *rqstp, struct nlm_file *file,
goto out;
}

- if (locks_in_grace()) {
+ if (locks_in_grace(SVC_NET(rqstp))) {
ret = nlm_lck_denied_grace_period;
goto out;
}
@@ -603,7 +603,7 @@ out:
* must be removed.
*/
__be32
-nlmsvc_unlock(struct nlm_file *file, struct nlm_lock *lock)
+nlmsvc_unlock(struct net *net, struct nlm_file *file, struct nlm_lock *lock)
{
int error;

@@ -615,7 +615,7 @@ nlmsvc_unlock(struct nlm_file *file, struct nlm_lock *lock)
(long long)lock->fl.fl_end);

/* First, cancel any lock that might be there */
- nlmsvc_cancel_blocked(file, lock);
+ nlmsvc_cancel_blocked(net, file, lock);

lock->fl.fl_type = F_UNLCK;
error = vfs_lock_file(file->f_file, F_SETLK, &lock->fl, NULL);
@@ -631,7 +631,7 @@ nlmsvc_unlock(struct nlm_file *file, struct nlm_lock *lock)
* The calling procedure must check whether the file can be closed.
*/
__be32
-nlmsvc_cancel_blocked(struct nlm_file *file, struct nlm_lock *lock)
+nlmsvc_cancel_blocked(struct net *net, struct nlm_file *file, struct nlm_lock *lock)
{
struct nlm_block *block;
int status = 0;
@@ -643,7 +643,7 @@ nlmsvc_cancel_blocked(struct nlm_file *file, struct nlm_lock *lock)
(long long)lock->fl.fl_start,
(long long)lock->fl.fl_end);

- if (locks_in_grace())
+ if (locks_in_grace(net))
return nlm_lck_denied_grace_period;

mutex_lock(&file->f_mutex);
diff --git a/fs/lockd/svcproc.c b/fs/lockd/svcproc.c
index d27aab1..de8f2ca 100644
--- a/fs/lockd/svcproc.c
+++ b/fs/lockd/svcproc.c
@@ -11,6 +11,7 @@
#include <linux/time.h>
#include <linux/lockd/lockd.h>
#include <linux/lockd/share.h>
+#include <linux/sunrpc/svc_xprt.h>

#define NLMDBG_FACILITY NLMDBG_CLIENT

@@ -175,13 +176,14 @@ nlmsvc_proc_cancel(struct svc_rqst *rqstp, struct nlm_args *argp,
{
struct nlm_host *host;
struct nlm_file *file;
+ struct net *net = SVC_NET(rqstp);

dprintk("lockd: CANCEL called\n");

resp->cookie = argp->cookie;

/* Don't accept requests during grace period */
- if (locks_in_grace()) {
+ if (locks_in_grace(net)) {
resp->status = nlm_lck_denied_grace_period;
return rpc_success;
}
@@ -191,7 +193,7 @@ nlmsvc_proc_cancel(struct svc_rqst *rqstp, struct nlm_args *argp,
return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;

/* Try to cancel request. */
- resp->status = cast_status(nlmsvc_cancel_blocked(file, &argp->lock));
+ resp->status = cast_status(nlmsvc_cancel_blocked(net, file, &argp->lock));

dprintk("lockd: CANCEL status %d\n", ntohl(resp->status));
nlmsvc_release_host(host);
@@ -208,13 +210,14 @@ nlmsvc_proc_unlock(struct svc_rqst *rqstp, struct nlm_args *argp,
{
struct nlm_host *host;
struct nlm_file *file;
+ struct net *net = SVC_NET(rqstp);

dprintk("lockd: UNLOCK called\n");

resp->cookie = argp->cookie;

/* Don't accept new lock requests during grace period */
- if (locks_in_grace()) {
+ if (locks_in_grace(net)) {
resp->status = nlm_lck_denied_grace_period;
return rpc_success;
}
@@ -224,7 +227,7 @@ nlmsvc_proc_unlock(struct svc_rqst *rqstp, struct nlm_args *argp,
return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;

/* Now try to remove the lock */
- resp->status = cast_status(nlmsvc_unlock(file, &argp->lock));
+ resp->status = cast_status(nlmsvc_unlock(net, file, &argp->lock));

dprintk("lockd: UNLOCK status %d\n", ntohl(resp->status));
nlmsvc_release_host(host);
@@ -361,7 +364,7 @@ nlmsvc_proc_share(struct svc_rqst *rqstp, struct nlm_args *argp,
resp->cookie = argp->cookie;

/* Don't accept new lock requests during grace period */
- if (locks_in_grace() && !argp->reclaim) {
+ if (locks_in_grace(SVC_NET(rqstp)) && !argp->reclaim) {
resp->status = nlm_lck_denied_grace_period;
return rpc_success;
}
@@ -394,7 +397,7 @@ nlmsvc_proc_unshare(struct svc_rqst *rqstp, struct nlm_args *argp,
resp->cookie = argp->cookie;

/* Don't accept requests during grace period */
- if (locks_in_grace()) {
+ if (locks_in_grace(SVC_NET(rqstp))) {
resp->status = nlm_lck_denied_grace_period;
return rpc_success;
}
diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index 987e719..c9c1c0a 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -354,10 +354,10 @@ nfsd4_open(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
/* Openowner is now set, so sequence id will get bumped. Now we need
* these checks before we do any creates: */
status = nfserr_grace;
- if (locks_in_grace() && open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
+ if (locks_in_grace(SVC_NET(rqstp)) && open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
goto out;
status = nfserr_no_grace;
- if (!locks_in_grace() && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
+ if (!locks_in_grace(SVC_NET(rqstp)) && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
goto out;

switch (open->op_claim_type) {
@@ -686,7 +686,8 @@ nfsd4_read(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,

nfs4_lock_state();
/* check stateid */
- if ((status = nfs4_preprocess_stateid_op(cstate, &read->rd_stateid,
+ if ((status = nfs4_preprocess_stateid_op(SVC_NET(rqstp),
+ cstate, &read->rd_stateid,
RD_STATE, &read->rd_filp))) {
dprintk("NFSD: nfsd4_read: couldn't process stateid!\n");
goto out;
@@ -741,7 +742,7 @@ nfsd4_remove(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
{
__be32 status;

- if (locks_in_grace())
+ if (locks_in_grace(SVC_NET(rqstp)))
return nfserr_grace;
status = nfsd_unlink(rqstp, &cstate->current_fh, 0,
remove->rm_name, remove->rm_namelen);
@@ -760,8 +761,8 @@ nfsd4_rename(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,

if (!cstate->save_fh.fh_dentry)
return status;
- if (locks_in_grace() && !(cstate->save_fh.fh_export->ex_flags
- & NFSEXP_NOSUBTREECHECK))
+ if (locks_in_grace(SVC_NET(rqstp)) &&
+ !(cstate->save_fh.fh_export->ex_flags & NFSEXP_NOSUBTREECHECK))
return nfserr_grace;
status = nfsd_rename(rqstp, &cstate->save_fh, rename->rn_sname,
rename->rn_snamelen, &cstate->current_fh,
@@ -845,7 +846,7 @@ nfsd4_setattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,

if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
nfs4_lock_state();
- status = nfs4_preprocess_stateid_op(cstate,
+ status = nfs4_preprocess_stateid_op(SVC_NET(rqstp), cstate,
&setattr->sa_stateid, WR_STATE, NULL);
nfs4_unlock_state();
if (status) {
@@ -890,7 +891,8 @@ nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
return nfserr_inval;

nfs4_lock_state();
- status = nfs4_preprocess_stateid_op(cstate, stateid, WR_STATE, &filp);
+ status = nfs4_preprocess_stateid_op(SVC_NET(rqstp),
+ cstate, stateid, WR_STATE, &filp);
if (filp)
get_file(filp);
nfs4_unlock_state();
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index fad2408..b926e00 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -2884,7 +2884,8 @@ static void nfsd4_open_deleg_none_ext(struct nfsd4_open *open, int status)
* Attempt to hand out a delegation.
*/
static void
-nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, struct nfs4_ol_stateid *stp)
+nfs4_open_delegation(struct net *net, struct svc_fh *fh,
+ struct nfsd4_open *open, struct nfs4_ol_stateid *stp)
{
struct nfs4_delegation *dp;
struct nfs4_openowner *oo = container_of(stp->st_stateowner, struct nfs4_openowner, oo_owner);
@@ -2905,7 +2906,7 @@ nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, struct nfs4_ol_
case NFS4_OPEN_CLAIM_NULL:
/* Let's not give out any delegations till everyone's
* had the chance to reclaim theirs.... */
- if (locks_in_grace())
+ if (locks_in_grace(net))
goto out;
if (!cb_up || !(oo->oo_flags & NFS4_OO_CONFIRMED))
goto out;
@@ -3039,7 +3040,7 @@ nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nf
* Attempt to hand out a delegation. No error return, because the
* OPEN succeeds even if we fail.
*/
- nfs4_open_delegation(current_fh, open, stp);
+ nfs4_open_delegation(SVC_NET(rqstp), current_fh, open, stp);
nodeleg:
status = nfs_ok;

@@ -3278,11 +3279,11 @@ out:
}

static inline __be32
-check_special_stateids(svc_fh *current_fh, stateid_t *stateid, int flags)
+check_special_stateids(struct net *net, svc_fh *current_fh, stateid_t *stateid, int flags)
{
if (ONE_STATEID(stateid) && (flags & RD_STATE))
return nfs_ok;
- else if (locks_in_grace()) {
+ else if (locks_in_grace(net)) {
/* Answer in remaining cases depends on existence of
* conflicting state; so we must wait out the grace period. */
return nfserr_grace;
@@ -3299,9 +3300,9 @@ check_special_stateids(svc_fh *current_fh, stateid_t *stateid, int flags)
* that are not able to provide mandatory locking.
*/
static inline int
-grace_disallows_io(struct inode *inode)
+grace_disallows_io(struct net *net, struct inode *inode)
{
- return locks_in_grace() && mandatory_lock(inode);
+ return locks_in_grace(net) && mandatory_lock(inode);
}

/* Returns true iff a is later than b: */
@@ -3392,7 +3393,7 @@ static __be32 nfsd4_lookup_stateid(stateid_t *stateid, unsigned char typemask, s
* Checks for stateid operations
*/
__be32
-nfs4_preprocess_stateid_op(struct nfsd4_compound_state *cstate,
+nfs4_preprocess_stateid_op(struct net *net, struct nfsd4_compound_state *cstate,
stateid_t *stateid, int flags, struct file **filpp)
{
struct nfs4_stid *s;
@@ -3405,11 +3406,11 @@ nfs4_preprocess_stateid_op(struct nfsd4_compound_state *cstate,
if (filpp)
*filpp = NULL;

- if (grace_disallows_io(ino))
+ if (grace_disallows_io(net, ino))
return nfserr_grace;

if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
- return check_special_stateids(current_fh, stateid, flags);
+ return check_special_stateids(net, current_fh, stateid, flags);

status = nfsd4_lookup_stateid(stateid, NFS4_DELEG_STID|NFS4_OPEN_STID|NFS4_LOCK_STID, &s);
if (status)
@@ -4106,10 +4107,10 @@ nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
goto out;

status = nfserr_grace;
- if (locks_in_grace() && !lock->lk_reclaim)
+ if (locks_in_grace(SVC_NET(rqstp)) && !lock->lk_reclaim)
goto out;
status = nfserr_no_grace;
- if (!locks_in_grace() && lock->lk_reclaim)
+ if (!locks_in_grace(SVC_NET(rqstp)) && lock->lk_reclaim)
goto out;

locks_init_lock(&file_lock);
@@ -4209,7 +4210,7 @@ nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
struct nfs4_lockowner *lo;
__be32 status;

- if (locks_in_grace())
+ if (locks_in_grace(SVC_NET(rqstp)))
return nfserr_grace;

if (check_lock_length(lockt->lt_offset, lockt->lt_length))
@@ -4702,7 +4703,7 @@ nfs4_state_start(void)
get_net(net);
nfsd4_client_tracking_init(net);
boot_time = get_seconds();
- locks_start_grace(&nn->nfsd4_manager);
+ locks_start_grace(net, &nn->nfsd4_manager);
grace_ended = false;
printk(KERN_INFO "NFSD: starting %ld-second grace period\n",
nfsd4_grace);
diff --git a/fs/nfsd/state.h b/fs/nfsd/state.h
index 495df4e..981ef10 100644
--- a/fs/nfsd/state.h
+++ b/fs/nfsd/state.h
@@ -451,7 +451,8 @@ static inline struct nfs4_ol_stateid *openlockstateid(struct nfs4_stid *s)

struct nfsd4_compound_state;

-extern __be32 nfs4_preprocess_stateid_op(struct nfsd4_compound_state *cstate,
+extern __be32 nfs4_preprocess_stateid_op(struct net *net,
+ struct nfsd4_compound_state *cstate,
stateid_t *stateid, int flags, struct file **filp);
extern void nfs4_lock_state(void);
extern void nfs4_unlock_state(void);
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 17fd887..a1e7727 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1163,9 +1163,10 @@ struct lock_manager {
struct list_head list;
};

-void locks_start_grace(struct lock_manager *);
+struct net;
+void locks_start_grace(struct net *, struct lock_manager *);
void locks_end_grace(struct lock_manager *);
-int locks_in_grace(void);
+int locks_in_grace(struct net *);

/* that will die - we need it for nfs_lock_info */
#include <linux/nfs_fs_i.h>
diff --git a/include/linux/lockd/lockd.h b/include/linux/lockd/lockd.h
index 50e31a2..f5a051a 100644
--- a/include/linux/lockd/lockd.h
+++ b/include/linux/lockd/lockd.h
@@ -262,11 +262,11 @@ typedef int (*nlm_host_match_fn_t)(void *cur, struct nlm_host *ref);
__be32 nlmsvc_lock(struct svc_rqst *, struct nlm_file *,
struct nlm_host *, struct nlm_lock *, int,
struct nlm_cookie *, int);
-__be32 nlmsvc_unlock(struct nlm_file *, struct nlm_lock *);
+__be32 nlmsvc_unlock(struct net *net, struct nlm_file *, struct nlm_lock *);
__be32 nlmsvc_testlock(struct svc_rqst *, struct nlm_file *,
struct nlm_host *, struct nlm_lock *,
struct nlm_lock *, struct nlm_cookie *);
-__be32 nlmsvc_cancel_blocked(struct nlm_file *, struct nlm_lock *);
+__be32 nlmsvc_cancel_blocked(struct net *net, struct nlm_file *, struct nlm_lock *);
unsigned long nlmsvc_retry_blocked(void);
void nlmsvc_traverse_blocks(struct nlm_host *, struct nlm_file *,
nlm_host_match_fn_t match);

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