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Subject[PATCH 010 of 14] knfsd: Use new cache code for name/id lookup caches



Signed-off-by: Neil Brown <neilb@suse.de>

### Diffstat output
./fs/nfsd/nfs4idmap.c | 126 ++++++++++++++++++++++++++++++++++++++++----------
1 file changed, 103 insertions(+), 23 deletions(-)
diff ./fs/nfsd/nfs4idmap.c~current~ ./fs/nfsd/nfs4idmap.c
--- ./fs/nfsd/nfs4idmap.c~current~ 2006-03-09 17:15:13.000000000 +1100
+++ ./fs/nfsd/nfs4idmap.c 2006-03-09 17:16:07.000000000 +1100
@@ -82,9 +82,12 @@ struct ent {
#define ENT_HASHMAX (1 << ENT_HASHBITS)
#define ENT_HASHMASK (ENT_HASHMAX - 1)

-static inline void
-ent_init(struct ent *new, struct ent *itm)
+static void
+ent_init(struct cache_head *cnew, struct cache_head *citm)
{
+ struct ent *new = container_of(cnew, struct ent, h);
+ struct ent *itm = container_of(citm, struct ent, h);
+
new->id = itm->id;
new->type = itm->type;

@@ -92,12 +95,6 @@ ent_init(struct ent *new, struct ent *it
strlcpy(new->authname, itm->authname, sizeof(new->name));
}

-static inline void
-ent_update(struct ent *new, struct ent *itm)
-{
- ent_init(new, itm);
-}
-
static void
ent_put(struct cache_head *ch, struct cache_detail *cd)
{
@@ -107,6 +104,16 @@ ent_put(struct cache_head *ch, struct ca
}
}

+static struct cache_head *
+ent_alloc(void)
+{
+ struct ent *e = kmalloc(sizeof(*e), GFP_KERNEL);
+ if (e)
+ return &e->h;
+ else
+ return NULL;
+}
+
/*
* ID -> Name cache
*/
@@ -143,9 +150,12 @@ idtoname_request(struct cache_detail *cd
(*bpp)[-1] = '\n';
}

-static inline int
-idtoname_match(struct ent *a, struct ent *b)
+static int
+idtoname_match(struct cache_head *ca, struct cache_head *cb)
{
+ struct ent *a = container_of(ca, struct ent, h);
+ struct ent *b = container_of(cb, struct ent, h);
+
return (a->id == b->id && a->type == b->type &&
strcmp(a->authname, b->authname) == 0);
}
@@ -178,7 +188,8 @@ warn_no_idmapd(struct cache_detail *deta


static int idtoname_parse(struct cache_detail *, char *, int);
-static struct ent *idtoname_lookup(struct ent *, int);
+static struct ent *idtoname_lookup(struct ent *);
+static struct ent *idtoname_update(struct ent *, struct ent *);

static struct cache_detail idtoname_cache = {
.owner = THIS_MODULE,
@@ -190,6 +201,10 @@ static struct cache_detail idtoname_cach
.cache_parse = idtoname_parse,
.cache_show = idtoname_show,
.warn_no_listener = warn_no_idmapd,
+ .match = idtoname_match,
+ .init = ent_init,
+ .update = ent_init,
+ .alloc = ent_alloc,
};

int
@@ -232,6 +247,11 @@ idtoname_parse(struct cache_detail *cd,
if (ent.h.expiry_time == 0)
goto out;

+ error = -ENOMEM;
+ res = idtoname_lookup(&ent);
+ if (!res)
+ goto out;
+
/* Name */
error = qword_get(&buf, buf1, PAGE_SIZE);
if (error == -EINVAL)
@@ -246,7 +266,8 @@ idtoname_parse(struct cache_detail *cd,
memcpy(ent.name, buf1, sizeof(ent.name));
}
error = -ENOMEM;
- if ((res = idtoname_lookup(&ent, 1)) == NULL)
+ res = idtoname_update(&ent, res);
+ if (res == NULL)
goto out;

ent_put(&res->h, &idtoname_cache);
@@ -258,7 +279,31 @@ out:
return error;
}

-static DefineSimpleCacheLookup(ent, idtoname);
+
+static struct ent *
+idtoname_lookup(struct ent *item)
+{
+ struct cache_head *ch = sunrpc_cache_lookup(&idtoname_cache,
+ &item->h,
+ idtoname_hash(item));
+ if (ch)
+ return container_of(ch, struct ent, h);
+ else
+ return NULL;
+}
+
+static struct ent *
+idtoname_update(struct ent *new, struct ent *old)
+{
+ struct cache_head *ch = sunrpc_cache_update(&idtoname_cache,
+ &new->h, &old->h,
+ idtoname_hash(new));
+ if (ch)
+ return container_of(ch, struct ent, h);
+ else
+ return NULL;
+}
+

/*
* Name -> ID cache
@@ -285,9 +330,12 @@ nametoid_request(struct cache_detail *cd
(*bpp)[-1] = '\n';
}

-static inline int
-nametoid_match(struct ent *a, struct ent *b)
+static int
+nametoid_match(struct cache_head *ca, struct cache_head *cb)
{
+ struct ent *a = container_of(ca, struct ent, h);
+ struct ent *b = container_of(cb, struct ent, h);
+
return (a->type == b->type && strcmp(a->name, b->name) == 0 &&
strcmp(a->authname, b->authname) == 0);
}
@@ -311,7 +359,8 @@ nametoid_show(struct seq_file *m, struct
return 0;
}

-static struct ent *nametoid_lookup(struct ent *, int);
+static struct ent *nametoid_lookup(struct ent *);
+static struct ent *nametoid_update(struct ent *, struct ent *);
static int nametoid_parse(struct cache_detail *, char *, int);

static struct cache_detail nametoid_cache = {
@@ -324,6 +373,10 @@ static struct cache_detail nametoid_cach
.cache_parse = nametoid_parse,
.cache_show = nametoid_show,
.warn_no_listener = warn_no_idmapd,
+ .match = nametoid_match,
+ .init = ent_init,
+ .update = ent_init,
+ .alloc = ent_alloc,
};

static int
@@ -373,7 +426,11 @@ nametoid_parse(struct cache_detail *cd,
set_bit(CACHE_NEGATIVE, &ent.h.flags);

error = -ENOMEM;
- if ((res = nametoid_lookup(&ent, 1)) == NULL)
+ res = nametoid_lookup(&ent);
+ if (res == NULL)
+ goto out;
+ res = nametoid_update(&ent, res);
+ if (res == NULL)
goto out;

ent_put(&res->h, &nametoid_cache);
@@ -384,7 +441,30 @@ out:
return (error);
}

-static DefineSimpleCacheLookup(ent, nametoid);
+
+static struct ent *
+nametoid_lookup(struct ent *item)
+{
+ struct cache_head *ch = sunrpc_cache_lookup(&nametoid_cache,
+ &item->h,
+ nametoid_hash(item));
+ if (ch)
+ return container_of(ch, struct ent, h);
+ else
+ return NULL;
+}
+
+static struct ent *
+nametoid_update(struct ent *new, struct ent *old)
+{
+ struct cache_head *ch = sunrpc_cache_update(&nametoid_cache,
+ &new->h, &old->h,
+ nametoid_hash(new));
+ if (ch)
+ return container_of(ch, struct ent, h);
+ else
+ return NULL;
+}

/*
* Exported API
@@ -452,24 +532,24 @@ idmap_defer(struct cache_req *req)
}

static inline int
-do_idmap_lookup(struct ent *(*lookup_fn)(struct ent *, int), struct ent *key,
+do_idmap_lookup(struct ent *(*lookup_fn)(struct ent *), struct ent *key,
struct cache_detail *detail, struct ent **item,
struct idmap_defer_req *mdr)
{
- *item = lookup_fn(key, 0);
+ *item = lookup_fn(key);
if (!*item)
return -ENOMEM;
return cache_check(detail, &(*item)->h, &mdr->req);
}

static inline int
-do_idmap_lookup_nowait(struct ent *(*lookup_fn)(struct ent *, int),
+do_idmap_lookup_nowait(struct ent *(*lookup_fn)(struct ent *),
struct ent *key, struct cache_detail *detail,
struct ent **item)
{
int ret = -ENOMEM;

- *item = lookup_fn(key, 0);
+ *item = lookup_fn(key);
if (!*item)
goto out_err;
ret = -ETIMEDOUT;
@@ -490,7 +570,7 @@ out_err:

static int
idmap_lookup(struct svc_rqst *rqstp,
- struct ent *(*lookup_fn)(struct ent *, int), struct ent *key,
+ struct ent *(*lookup_fn)(struct ent *), struct ent *key,
struct cache_detail *detail, struct ent **item)
{
struct idmap_defer_req *mdr;
-
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