[PATCH 014 of 14] knfsd: Convert sunrpc_cache to use krefs

From: NeilBrown
Date: Thu Mar 09 2006 - 01:53:10 EST


.. it makes some of the code nicer.

Signed-off-by: Neil Brown <neilb@xxxxxxx>

### Diffstat output
./fs/nfsd/export.c | 51 ++++++++++++++++--------------------
./fs/nfsd/nfs4idmap.c | 18 +++++-------
./include/linux/nfsd/export.h | 4 --
./include/linux/sunrpc/cache.h | 13 ++++-----
./net/sunrpc/auth_gss/svcauth_gss.c | 28 ++++++++-----------
./net/sunrpc/cache.c | 20 +++++++-------
./net/sunrpc/svcauth_unix.c | 20 +++++++-------
7 files changed, 71 insertions(+), 83 deletions(-)

diff ./fs/nfsd/export.c~current~ ./fs/nfsd/export.c
--- ./fs/nfsd/export.c~current~ 2006-03-09 17:29:35.000000000 +1100
+++ ./fs/nfsd/export.c 2006-03-09 17:46:00.000000000 +1100
@@ -57,18 +57,17 @@ static int exp_verify_string(char *cp,
#define EXPKEY_HASHMASK (EXPKEY_HASHMAX -1)
static struct cache_head *expkey_table[EXPKEY_HASHMAX];

-void expkey_put(struct cache_head *item, struct cache_detail *cd)
+void expkey_put(struct kref *ref)
{
- if (cache_put(item, cd)) {
- struct svc_expkey *key = container_of(item, struct svc_expkey, h);
- if (test_bit(CACHE_VALID, &item->flags) &&
- !test_bit(CACHE_NEGATIVE, &item->flags)) {
- dput(key->ek_dentry);
- mntput(key->ek_mnt);
- }
- auth_domain_put(key->ek_client);
- kfree(key);
+ struct svc_expkey *key = container_of(ref, struct svc_expkey, h.ref);
+
+ if (test_bit(CACHE_VALID, &key->h.flags) &&
+ !test_bit(CACHE_NEGATIVE, &key->h.flags)) {
+ dput(key->ek_dentry);
+ mntput(key->ek_mnt);
}
+ auth_domain_put(key->ek_client);
+ kfree(key);
}

static void expkey_request(struct cache_detail *cd,
@@ -158,7 +157,7 @@ static int expkey_parse(struct cache_det
set_bit(CACHE_NEGATIVE, &key.h.flags);
ek = svc_expkey_update(&key, ek);
if (ek)
- expkey_put(&ek->h, &svc_expkey_cache);
+ cache_put(&ek->h, &svc_expkey_cache);
else err = -ENOMEM;
} else {
struct nameidata nd;
@@ -172,7 +171,7 @@ static int expkey_parse(struct cache_det

ek = svc_expkey_update(&key, ek);
if (ek)
- expkey_put(&ek->h, &svc_expkey_cache);
+ cache_put(&ek->h, &svc_expkey_cache);
else
err = -ENOMEM;
path_release(&nd);
@@ -318,15 +317,13 @@ svc_expkey_update(struct svc_expkey *new

static struct cache_head *export_table[EXPORT_HASHMAX];

-void svc_export_put(struct cache_head *item, struct cache_detail *cd)
+void svc_export_put(struct kref *ref)
{
- if (cache_put(item, cd)) {
- struct svc_export *exp = container_of(item, struct svc_export, h);
- dput(exp->ex_dentry);
- mntput(exp->ex_mnt);
- auth_domain_put(exp->ex_client);
- kfree(exp);
- }
+ struct svc_export *exp = container_of(ref, struct svc_export, h.ref);
+ dput(exp->ex_dentry);
+ mntput(exp->ex_mnt);
+ auth_domain_put(exp->ex_client);
+ kfree(exp);
}

static void svc_export_request(struct cache_detail *cd,
@@ -633,7 +630,7 @@ static int exp_set_key(svc_client *clp,
if (ek)
ek = svc_expkey_update(&key,ek);
if (ek) {
- expkey_put(&ek->h, &svc_expkey_cache);
+ cache_put(&ek->h, &svc_expkey_cache);
return 0;
}
return -ENOMEM;
@@ -762,7 +759,7 @@ static void exp_fsid_unhash(struct svc_e
ek = exp_get_fsid_key(exp->ex_client, exp->ex_fsid);
if (ek && !IS_ERR(ek)) {
ek->h.expiry_time = get_seconds()-1;
- expkey_put(&ek->h, &svc_expkey_cache);
+ cache_put(&ek->h, &svc_expkey_cache);
}
svc_expkey_cache.nextcheck = get_seconds();
}
@@ -800,7 +797,7 @@ static void exp_unhash(struct svc_export
ek = exp_get_key(exp->ex_client, inode->i_sb->s_dev, inode->i_ino);
if (ek && !IS_ERR(ek)) {
ek->h.expiry_time = get_seconds()-1;
- expkey_put(&ek->h, &svc_expkey_cache);
+ cache_put(&ek->h, &svc_expkey_cache);
}
svc_expkey_cache.nextcheck = get_seconds();
}
@@ -902,7 +899,7 @@ finish:
if (exp)
exp_put(exp);
if (fsid_key && !IS_ERR(fsid_key))
- expkey_put(&fsid_key->h, &svc_expkey_cache);
+ cache_put(&fsid_key->h, &svc_expkey_cache);
if (clp)
auth_domain_put(clp);
path_release(&nd);
@@ -1030,7 +1027,7 @@ exp_find(struct auth_domain *clp, int fs
return ERR_PTR(PTR_ERR(ek));

exp = exp_get_by_name(clp, ek->ek_mnt, ek->ek_dentry, reqp);
- expkey_put(&ek->h, &svc_expkey_cache);
+ cache_put(&ek->h, &svc_expkey_cache);

if (!exp || IS_ERR(exp))
return ERR_PTR(PTR_ERR(exp));
@@ -1068,7 +1065,7 @@ exp_pseudoroot(struct auth_domain *clp,
else
rv = fh_compose(fhp, exp,
fsid_key->ek_dentry, NULL);
- expkey_put(&fsid_key->h, &svc_expkey_cache);
+ cache_put(&fsid_key->h, &svc_expkey_cache);
return rv;
}

@@ -1187,7 +1184,7 @@ static int e_show(struct seq_file *m, vo
cache_get(&exp->h);
if (cache_check(&svc_export_cache, &exp->h, NULL))
return 0;
- if (cache_put(&exp->h, &svc_export_cache)) BUG();
+ cache_put(&exp->h, &svc_export_cache);
return svc_export_show(m, &svc_export_cache, cp);
}


diff ./fs/nfsd/nfs4idmap.c~current~ ./fs/nfsd/nfs4idmap.c
--- ./fs/nfsd/nfs4idmap.c~current~ 2006-03-09 17:29:35.000000000 +1100
+++ ./fs/nfsd/nfs4idmap.c 2006-03-09 17:46:00.000000000 +1100
@@ -96,12 +96,10 @@ ent_init(struct cache_head *cnew, struct
}

static void
-ent_put(struct cache_head *ch, struct cache_detail *cd)
+ent_put(struct kref *ref)
{
- if (cache_put(ch, cd)) {
- struct ent *map = container_of(ch, struct ent, h);
- kfree(map);
- }
+ struct ent *map = container_of(ref, struct ent, h.ref);
+ kfree(map);
}

static struct cache_head *
@@ -270,7 +268,7 @@ idtoname_parse(struct cache_detail *cd,
if (res == NULL)
goto out;

- ent_put(&res->h, &idtoname_cache);
+ cache_put(&res->h, &idtoname_cache);

error = 0;
out:
@@ -433,7 +431,7 @@ nametoid_parse(struct cache_detail *cd,
if (res == NULL)
goto out;

- ent_put(&res->h, &nametoid_cache);
+ cache_put(&res->h, &nametoid_cache);
error = 0;
out:
kfree(buf1);
@@ -562,7 +560,7 @@ do_idmap_lookup_nowait(struct ent *(*loo
goto out_put;
return 0;
out_put:
- ent_put(&(*item)->h, detail);
+ cache_put(&(*item)->h, detail);
out_err:
*item = NULL;
return ret;
@@ -613,7 +611,7 @@ idmap_name_to_id(struct svc_rqst *rqstp,
if (ret)
return ret;
*id = item->id;
- ent_put(&item->h, &nametoid_cache);
+ cache_put(&item->h, &nametoid_cache);
return 0;
}

@@ -635,7 +633,7 @@ idmap_id_to_name(struct svc_rqst *rqstp,
ret = strlen(item->name);
BUG_ON(ret > IDMAP_NAMESZ);
memcpy(name, item->name, ret);
- ent_put(&item->h, &idtoname_cache);
+ cache_put(&item->h, &idtoname_cache);
return ret;
}


diff ./include/linux/nfsd/export.h~current~ ./include/linux/nfsd/export.h
--- ./include/linux/nfsd/export.h~current~ 2006-03-09 17:29:35.000000000 +1100
+++ ./include/linux/nfsd/export.h 2006-03-09 17:46:00.000000000 +1100
@@ -102,13 +102,11 @@ int exp_rootfh(struct auth_domain *,
int exp_pseudoroot(struct auth_domain *, struct svc_fh *fhp, struct cache_req *creq);
int nfserrno(int errno);

-extern void expkey_put(struct cache_head *item, struct cache_detail *cd);
-extern void svc_export_put(struct cache_head *item, struct cache_detail *cd);
extern struct cache_detail svc_export_cache, svc_expkey_cache;

static inline void exp_put(struct svc_export *exp)
{
- svc_export_put(&exp->h, &svc_export_cache);
+ cache_put(&exp->h, &svc_export_cache);
}

static inline void exp_get(struct svc_export *exp)

diff ./include/linux/sunrpc/cache.h~current~ ./include/linux/sunrpc/cache.h
--- ./include/linux/sunrpc/cache.h~current~ 2006-03-09 17:33:29.000000000 +1100
+++ ./include/linux/sunrpc/cache.h 2006-03-09 17:46:00.000000000 +1100
@@ -50,7 +50,7 @@ struct cache_head {
time_t last_refresh; /* If CACHE_PENDING, this is when upcall
* was sent, else this is when update was received
*/
- atomic_t refcnt;
+ struct kref ref;
unsigned long flags;
};
#define CACHE_VALID 0 /* Entry contains valid data */
@@ -68,8 +68,7 @@ struct cache_detail {
atomic_t inuse; /* active user-space update or lookup */

char *name;
- void (*cache_put)(struct cache_head *,
- struct cache_detail*);
+ void (*cache_put)(struct kref *);

void (*cache_request)(struct cache_detail *cd,
struct cache_head *h,
@@ -151,17 +150,17 @@ extern void cache_clean_deferred(void *o

static inline struct cache_head *cache_get(struct cache_head *h)
{
- atomic_inc(&h->refcnt);
+ kref_get(&h->ref);
return h;
}


-static inline int cache_put(struct cache_head *h, struct cache_detail *cd)
+static inline void cache_put(struct cache_head *h, struct cache_detail *cd)
{
- if (atomic_read(&h->refcnt) <= 2 &&
+ if (atomic_read(&h->ref.refcount) <= 2 &&
h->expiry_time < cd->nextcheck)
cd->nextcheck = h->expiry_time;
- return atomic_dec_and_test(&h->refcnt);
+ kref_put(&h->ref, cd->cache_put);
}

extern void cache_init(struct cache_head *h);

diff ./net/sunrpc/auth_gss/svcauth_gss.c~current~ ./net/sunrpc/auth_gss/svcauth_gss.c
--- ./net/sunrpc/auth_gss/svcauth_gss.c~current~ 2006-03-09 17:29:35.000000000 +1100
+++ ./net/sunrpc/auth_gss/svcauth_gss.c 2006-03-09 17:46:00.000000000 +1100
@@ -89,13 +89,11 @@ static void rsi_free(struct rsi *rsii)
kfree(rsii->out_token.data);
}

-static void rsi_put(struct cache_head *item, struct cache_detail *cd)
+static void rsi_put(struct kref *ref)
{
- struct rsi *rsii = container_of(item, struct rsi, h);
- if (cache_put(item, cd)) {
- rsi_free(rsii);
- kfree(rsii);
- }
+ struct rsi *rsii = container_of(ref, struct rsi, h.ref);
+ rsi_free(rsii);
+ kfree(rsii);
}

static inline int rsi_hash(struct rsi *item)
@@ -267,7 +265,7 @@ static int rsi_parse(struct cache_detail
out:
rsi_free(&rsii);
if (rsip)
- rsi_put(&rsip->h, &rsi_cache);
+ cache_put(&rsip->h, &rsi_cache);
else
status = -ENOMEM;
return status;
@@ -357,14 +355,12 @@ static void rsc_free(struct rsc *rsci)
put_group_info(rsci->cred.cr_group_info);
}

-static void rsc_put(struct cache_head *item, struct cache_detail *cd)
+static void rsc_put(struct kref *ref)
{
- struct rsc *rsci = container_of(item, struct rsc, h);
+ struct rsc *rsci = container_of(ref, struct rsc, h.ref);

- if (cache_put(item, cd)) {
- rsc_free(rsci);
- kfree(rsci);
- }
+ rsc_free(rsci);
+ kfree(rsci);
}

static inline int
@@ -509,7 +505,7 @@ static int rsc_parse(struct cache_detail
out:
rsc_free(&rsci);
if (rscp)
- rsc_put(&rscp->h, &rsc_cache);
+ cache_put(&rscp->h, &rsc_cache);
else
status = -ENOMEM;
return status;
@@ -1076,7 +1072,7 @@ drop:
ret = SVC_DROP;
out:
if (rsci)
- rsc_put(&rsci->h, &rsc_cache);
+ cache_put(&rsci->h, &rsc_cache);
return ret;
}

@@ -1168,7 +1164,7 @@ out_err:
put_group_info(rqstp->rq_cred.cr_group_info);
rqstp->rq_cred.cr_group_info = NULL;
if (gsd->rsci)
- rsc_put(&gsd->rsci->h, &rsc_cache);
+ cache_put(&gsd->rsci->h, &rsc_cache);
gsd->rsci = NULL;

return stat;

diff ./net/sunrpc/cache.c~current~ ./net/sunrpc/cache.c
--- ./net/sunrpc/cache.c~current~ 2006-03-09 17:45:46.000000000 +1100
+++ ./net/sunrpc/cache.c 2006-03-09 17:46:00.000000000 +1100
@@ -42,7 +42,7 @@ void cache_init(struct cache_head *h)
time_t now = get_seconds();
h->next = NULL;
h->flags = 0;
- atomic_set(&h->refcnt, 1);
+ kref_init(&h->ref);
h->expiry_time = now + CACHE_NEW_EXPIRY;
h->last_refresh = now;
}
@@ -81,7 +81,7 @@ struct cache_head *sunrpc_cache_lookup(s
if (detail->match(tmp, key)) {
cache_get(tmp);
write_unlock(&detail->hash_lock);
- detail->cache_put(new, detail);
+ cache_put(new, detail);
return tmp;
}
}
@@ -145,7 +145,7 @@ struct cache_head *sunrpc_cache_update(s
/* We need to insert a new entry */
tmp = detail->alloc();
if (!tmp) {
- detail->cache_put(old, detail);
+ cache_put(old, detail);
return NULL;
}
cache_init(tmp);
@@ -165,7 +165,7 @@ struct cache_head *sunrpc_cache_update(s
write_unlock(&detail->hash_lock);
cache_fresh_unlocked(tmp, detail, is_new);
cache_fresh_unlocked(old, detail, 0);
- detail->cache_put(old, detail);
+ cache_put(old, detail);
return tmp;
}
EXPORT_SYMBOL(sunrpc_cache_update);
@@ -234,7 +234,7 @@ int cache_check(struct cache_detail *det
cache_defer_req(rqstp, h);

if (rv)
- detail->cache_put(h, detail);
+ cache_put(h, detail);
return rv;
}

@@ -431,7 +431,7 @@ static int cache_clean(void)
if (test_and_clear_bit(CACHE_PENDING, &ch->flags))
queue_loose(current_detail, ch);

- if (atomic_read(&ch->refcnt) == 1)
+ if (atomic_read(&ch->ref.refcount) == 1)
break;
}
if (ch) {
@@ -446,7 +446,7 @@ static int cache_clean(void)
current_index ++;
spin_unlock(&cache_list_lock);
if (ch)
- d->cache_put(ch, d);
+ cache_put(ch, d);
} else
spin_unlock(&cache_list_lock);

@@ -723,7 +723,7 @@ cache_read(struct file *filp, char __use
!test_bit(CACHE_PENDING, &rq->item->flags)) {
list_del(&rq->q.list);
spin_unlock(&queue_lock);
- cd->cache_put(rq->item, cd);
+ cache_put(rq->item, cd);
kfree(rq->buf);
kfree(rq);
} else
@@ -906,7 +906,7 @@ static void queue_loose(struct cache_det
continue;
list_del(&cr->q.list);
spin_unlock(&queue_lock);
- detail->cache_put(cr->item, detail);
+ cache_put(cr->item, detail);
kfree(cr->buf);
kfree(cr);
return;
@@ -1192,7 +1192,7 @@ static int c_show(struct seq_file *m, vo

ifdebug(CACHE)
seq_printf(m, "# expiry=%ld refcnt=%d flags=%lx\n",
- cp->expiry_time, atomic_read(&cp->refcnt), cp->flags);
+ cp->expiry_time, atomic_read(&cp->ref.refcount), cp->flags);
cache_get(cp);
if (cache_check(cd, cp, NULL))
/* cache_check does a cache_put on failure */

diff ./net/sunrpc/svcauth_unix.c~current~ ./net/sunrpc/svcauth_unix.c
--- ./net/sunrpc/svcauth_unix.c~current~ 2006-03-09 17:29:35.000000000 +1100
+++ ./net/sunrpc/svcauth_unix.c 2006-03-09 17:46:00.000000000 +1100
@@ -84,15 +84,15 @@ struct ip_map {
};
static struct cache_head *ip_table[IP_HASHMAX];

-static void ip_map_put(struct cache_head *item, struct cache_detail *cd)
+static void ip_map_put(struct kref *kref)
{
+ struct cache_head *item = container_of(kref, struct cache_head, ref);
struct ip_map *im = container_of(item, struct ip_map,h);
- if (cache_put(item, cd)) {
- if (test_bit(CACHE_VALID, &item->flags) &&
- !test_bit(CACHE_NEGATIVE, &item->flags))
- auth_domain_put(&im->m_client->h);
- kfree(im);
- }
+
+ if (test_bit(CACHE_VALID, &item->flags) &&
+ !test_bit(CACHE_NEGATIVE, &item->flags))
+ auth_domain_put(&im->m_client->h);
+ kfree(im);
}

#if IP_HASHBITS == 8
@@ -315,7 +315,7 @@ static int ip_map_update(struct ip_map *
hash_ip((unsigned long)ipm->m_addr.s_addr));
if (!ch)
return -ENOMEM;
- ip_map_put(ch, &ip_map_cache);
+ cache_put(ch, &ip_map_cache);
return 0;
}

@@ -369,7 +369,7 @@ struct auth_domain *auth_unix_lookup(str
rv = &ipm->m_client->h;
kref_get(&rv->ref);
}
- ip_map_put(&ipm->h, &ip_map_cache);
+ cache_put(&ipm->h, &ip_map_cache);
return rv;
}

@@ -403,7 +403,7 @@ svcauth_unix_set_client(struct svc_rqst
case 0:
rqstp->rq_client = &ipm->m_client->h;
kref_get(&rqstp->rq_client->ref);
- ip_map_put(&ipm->h, &ip_map_cache);
+ cache_put(&ipm->h, &ip_map_cache);
break;
}
return SVC_OK;
-
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