forked from Minki/linux
[PATCH] knfsd: Use new cache_lookup for svc_expkey cache
Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
NeilBrown
Linus Torvalds
parent
4f7774c3a0
commit
8d270f7f4c
140
fs/nfsd/export.c
140
fs/nfsd/export.c
@ -57,17 +57,6 @@ static int exp_verify_string(char *cp, int max);
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#define EXPKEY_HASHMASK (EXPKEY_HASHMAX -1)
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static struct cache_head *expkey_table[EXPKEY_HASHMAX];
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static inline int svc_expkey_hash(struct svc_expkey *item)
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{
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int hash = item->ek_fsidtype;
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char * cp = (char*)item->ek_fsid;
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int len = key_len(item->ek_fsidtype);
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hash ^= hash_mem(cp, len, EXPKEY_HASHBITS);
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hash ^= hash_ptr(item->ek_client, EXPKEY_HASHBITS);
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return hash & EXPKEY_HASHMASK;
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}
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void expkey_put(struct cache_head *item, struct cache_detail *cd)
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{
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if (cache_put(item, cd)) {
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@ -97,7 +86,8 @@ static void expkey_request(struct cache_detail *cd,
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(*bpp)[-1] = '\n';
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}
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static struct svc_expkey *svc_expkey_lookup(struct svc_expkey *, int);
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static struct svc_expkey *svc_expkey_update(struct svc_expkey *new, struct svc_expkey *old);
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static struct svc_expkey *svc_expkey_lookup(struct svc_expkey *);
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static int expkey_parse(struct cache_detail *cd, char *mesg, int mlen)
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{
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/* client fsidtype fsid [path] */
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@ -108,6 +98,7 @@ static int expkey_parse(struct cache_detail *cd, char *mesg, int mlen)
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int fsidtype;
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char *ep;
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struct svc_expkey key;
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struct svc_expkey *ek;
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if (mesg[mlen-1] != '\n')
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return -EINVAL;
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@ -152,20 +143,25 @@ static int expkey_parse(struct cache_detail *cd, char *mesg, int mlen)
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key.ek_fsidtype = fsidtype;
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memcpy(key.ek_fsid, buf, len);
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ek = svc_expkey_lookup(&key);
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err = -ENOMEM;
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if (!ek)
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goto out;
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/* now we want a pathname, or empty meaning NEGATIVE */
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err = -EINVAL;
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if ((len=qword_get(&mesg, buf, PAGE_SIZE)) < 0)
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goto out;
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dprintk("Path seems to be <%s>\n", buf);
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err = 0;
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if (len == 0) {
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struct svc_expkey *ek;
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set_bit(CACHE_NEGATIVE, &key.h.flags);
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ek = svc_expkey_lookup(&key, 1);
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ek = svc_expkey_update(&key, ek);
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if (ek)
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expkey_put(&ek->h, &svc_expkey_cache);
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else err = -ENOMEM;
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} else {
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struct nameidata nd;
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struct svc_expkey *ek;
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err = path_lookup(buf, 0, &nd);
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if (err)
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goto out;
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@ -174,10 +170,11 @@ static int expkey_parse(struct cache_detail *cd, char *mesg, int mlen)
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key.ek_mnt = nd.mnt;
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key.ek_dentry = nd.dentry;
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ek = svc_expkey_lookup(&key, 1);
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ek = svc_expkey_update(&key, ek);
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if (ek)
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expkey_put(&ek->h, &svc_expkey_cache);
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err = 0;
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else
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err = -ENOMEM;
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path_release(&nd);
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}
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cache_flush();
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@ -214,6 +211,51 @@ static int expkey_show(struct seq_file *m,
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return 0;
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}
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static inline int expkey_match (struct cache_head *a, struct cache_head *b)
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{
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struct svc_expkey *orig = container_of(a, struct svc_expkey, h);
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struct svc_expkey *new = container_of(b, struct svc_expkey, h);
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if (orig->ek_fsidtype != new->ek_fsidtype ||
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orig->ek_client != new->ek_client ||
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memcmp(orig->ek_fsid, new->ek_fsid, key_len(orig->ek_fsidtype)) != 0)
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return 0;
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return 1;
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}
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static inline void expkey_init(struct cache_head *cnew,
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struct cache_head *citem)
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{
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struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
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struct svc_expkey *item = container_of(citem, struct svc_expkey, h);
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kref_get(&item->ek_client->ref);
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new->ek_client = item->ek_client;
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new->ek_fsidtype = item->ek_fsidtype;
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new->ek_fsid[0] = item->ek_fsid[0];
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new->ek_fsid[1] = item->ek_fsid[1];
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new->ek_fsid[2] = item->ek_fsid[2];
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}
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static inline void expkey_update(struct cache_head *cnew,
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struct cache_head *citem)
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{
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struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
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struct svc_expkey *item = container_of(citem, struct svc_expkey, h);
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new->ek_mnt = mntget(item->ek_mnt);
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new->ek_dentry = dget(item->ek_dentry);
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}
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static struct cache_head *expkey_alloc(void)
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{
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struct svc_expkey *i = kmalloc(sizeof(*i), GFP_KERNEL);
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if (i)
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return &i->h;
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else
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return NULL;
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}
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struct cache_detail svc_expkey_cache = {
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.owner = THIS_MODULE,
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.hash_size = EXPKEY_HASHMAX,
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@ -223,34 +265,52 @@ struct cache_detail svc_expkey_cache = {
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.cache_request = expkey_request,
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.cache_parse = expkey_parse,
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.cache_show = expkey_show,
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.match = expkey_match,
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.init = expkey_init,
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.update = expkey_update,
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.alloc = expkey_alloc,
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};
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static inline int svc_expkey_match (struct svc_expkey *a, struct svc_expkey *b)
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static struct svc_expkey *
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svc_expkey_lookup(struct svc_expkey *item)
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{
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if (a->ek_fsidtype != b->ek_fsidtype ||
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a->ek_client != b->ek_client ||
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memcmp(a->ek_fsid, b->ek_fsid, key_len(a->ek_fsidtype)) != 0)
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return 0;
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return 1;
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struct cache_head *ch;
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int hash = item->ek_fsidtype;
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char * cp = (char*)item->ek_fsid;
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int len = key_len(item->ek_fsidtype);
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hash ^= hash_mem(cp, len, EXPKEY_HASHBITS);
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hash ^= hash_ptr(item->ek_client, EXPKEY_HASHBITS);
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hash &= EXPKEY_HASHMASK;
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ch = sunrpc_cache_lookup(&svc_expkey_cache, &item->h,
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hash);
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if (ch)
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return container_of(ch, struct svc_expkey, h);
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else
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return NULL;
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}
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static inline void svc_expkey_init(struct svc_expkey *new, struct svc_expkey *item)
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static struct svc_expkey *
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svc_expkey_update(struct svc_expkey *new, struct svc_expkey *old)
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{
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kref_get(&item->ek_client->ref);
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new->ek_client = item->ek_client;
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new->ek_fsidtype = item->ek_fsidtype;
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new->ek_fsid[0] = item->ek_fsid[0];
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new->ek_fsid[1] = item->ek_fsid[1];
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new->ek_fsid[2] = item->ek_fsid[2];
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struct cache_head *ch;
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int hash = new->ek_fsidtype;
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char * cp = (char*)new->ek_fsid;
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int len = key_len(new->ek_fsidtype);
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hash ^= hash_mem(cp, len, EXPKEY_HASHBITS);
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hash ^= hash_ptr(new->ek_client, EXPKEY_HASHBITS);
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hash &= EXPKEY_HASHMASK;
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ch = sunrpc_cache_update(&svc_expkey_cache, &new->h,
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&old->h, hash);
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if (ch)
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return container_of(ch, struct svc_expkey, h);
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else
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return NULL;
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}
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static inline void svc_expkey_update(struct svc_expkey *new, struct svc_expkey *item)
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{
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new->ek_mnt = mntget(item->ek_mnt);
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new->ek_dentry = dget(item->ek_dentry);
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}
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static DefineSimpleCacheLookup(svc_expkey, svc_expkey)
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#define EXPORT_HASHBITS 8
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#define EXPORT_HASHMAX (1<< EXPORT_HASHBITS)
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@ -549,7 +609,7 @@ exp_find_key(svc_client *clp, int fsid_type, u32 *fsidv, struct cache_req *reqp)
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key.ek_fsidtype = fsid_type;
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memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
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ek = svc_expkey_lookup(&key, 0);
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ek = svc_expkey_lookup(&key);
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if (ek != NULL)
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if ((err = cache_check(&svc_expkey_cache, &ek->h, reqp)))
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ek = ERR_PTR(err);
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@ -569,7 +629,9 @@ static int exp_set_key(svc_client *clp, int fsid_type, u32 *fsidv,
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key.h.expiry_time = NEVER;
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key.h.flags = 0;
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ek = svc_expkey_lookup(&key, 1);
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ek = svc_expkey_lookup(&key);
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if (ek)
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ek = svc_expkey_update(&key,ek);
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if (ek) {
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expkey_put(&ek->h, &svc_expkey_cache);
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return 0;
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