diff options
| -rw-r--r-- | fs/nfsd/export.c | 136 |
1 files changed, 99 insertions, 37 deletions
diff --git a/fs/nfsd/export.c b/fs/nfsd/export.c index 2ebd77d..abd6896 100644 --- a/fs/nfsd/export.c +++ b/fs/nfsd/export.c @@ -57,17 +57,6 @@ static int exp_verify_string(char *cp, int max); #define EXPKEY_HASHMASK (EXPKEY_HASHMAX -1) static struct cache_head *expkey_table[EXPKEY_HASHMAX]; -static inline int svc_expkey_hash(struct svc_expkey *item) -{ - int hash = item->ek_fsidtype; - char * cp = (char*)item->ek_fsid; - int len = key_len(item->ek_fsidtype); - - hash ^= hash_mem(cp, len, EXPKEY_HASHBITS); - hash ^= hash_ptr(item->ek_client, EXPKEY_HASHBITS); - return hash & EXPKEY_HASHMASK; -} - void expkey_put(struct cache_head *item, struct cache_detail *cd) { if (cache_put(item, cd)) { @@ -97,7 +86,8 @@ static void expkey_request(struct cache_detail *cd, (*bpp)[-1] = '\n'; } -static struct svc_expkey *svc_expkey_lookup(struct svc_expkey *, int); +static struct svc_expkey *svc_expkey_update(struct svc_expkey *new, struct svc_expkey *old); +static struct svc_expkey *svc_expkey_lookup(struct svc_expkey *); static int expkey_parse(struct cache_detail *cd, char *mesg, int mlen) { /* client fsidtype fsid [path] */ @@ -108,6 +98,7 @@ static int expkey_parse(struct cache_detail *cd, char *mesg, int mlen) int fsidtype; char *ep; struct svc_expkey key; + struct svc_expkey *ek; if (mesg[mlen-1] != '\n') return -EINVAL; @@ -152,20 +143,25 @@ static int expkey_parse(struct cache_detail *cd, char *mesg, int mlen) key.ek_fsidtype = fsidtype; memcpy(key.ek_fsid, buf, len); + ek = svc_expkey_lookup(&key); + err = -ENOMEM; + if (!ek) + goto out; + /* now we want a pathname, or empty meaning NEGATIVE */ + err = -EINVAL; if ((len=qword_get(&mesg, buf, PAGE_SIZE)) < 0) goto out; dprintk("Path seems to be <%s>\n", buf); err = 0; if (len == 0) { - struct svc_expkey *ek; set_bit(CACHE_NEGATIVE, &key.h.flags); - ek = svc_expkey_lookup(&key, 1); + ek = svc_expkey_update(&key, ek); if (ek) expkey_put(&ek->h, &svc_expkey_cache); + else err = -ENOMEM; } else { struct nameidata nd; - struct svc_expkey *ek; err = path_lookup(buf, 0, &nd); if (err) goto out; @@ -174,10 +170,11 @@ static int expkey_parse(struct cache_detail *cd, char *mesg, int mlen) key.ek_mnt = nd.mnt; key.ek_dentry = nd.dentry; - ek = svc_expkey_lookup(&key, 1); + ek = svc_expkey_update(&key, ek); if (ek) expkey_put(&ek->h, &svc_expkey_cache); - err = 0; + else + err = -ENOMEM; path_release(&nd); } cache_flush(); @@ -213,29 +210,25 @@ static int expkey_show(struct seq_file *m, seq_printf(m, "\n"); return 0; } - -struct cache_detail svc_expkey_cache = { - .owner = THIS_MODULE, - .hash_size = EXPKEY_HASHMAX, - .hash_table = expkey_table, - .name = "nfsd.fh", - .cache_put = expkey_put, - .cache_request = expkey_request, - .cache_parse = expkey_parse, - .cache_show = expkey_show, -}; -static inline int svc_expkey_match (struct svc_expkey *a, struct svc_expkey *b) +static inline int expkey_match (struct cache_head *a, struct cache_head *b) { - if (a->ek_fsidtype != b->ek_fsidtype || - a->ek_client != b->ek_client || - memcmp(a->ek_fsid, b->ek_fsid, key_len(a->ek_fsidtype)) != 0) + struct svc_expkey *orig = container_of(a, struct svc_expkey, h); + struct svc_expkey *new = container_of(b, struct svc_expkey, h); + + if (orig->ek_fsidtype != new->ek_fsidtype || + orig->ek_client != new->ek_client || + memcmp(orig->ek_fsid, new->ek_fsid, key_len(orig->ek_fsidtype)) != 0) return 0; return 1; } -static inline void svc_expkey_init(struct svc_expkey *new, struct svc_expkey *item) +static inline void expkey_init(struct cache_head *cnew, + struct cache_head *citem) { + struct svc_expkey *new = container_of(cnew, struct svc_expkey, h); + struct svc_expkey *item = container_of(citem, struct svc_expkey, h); + kref_get(&item->ek_client->ref); new->ek_client = item->ek_client; new->ek_fsidtype = item->ek_fsidtype; @@ -244,13 +237,80 @@ static inline void svc_expkey_init(struct svc_expkey *new, struct svc_expkey *it new->ek_fsid[2] = item->ek_fsid[2]; } -static inline void svc_expkey_update(struct svc_expkey *new, struct svc_expkey *item) +static inline void expkey_update(struct cache_head *cnew, + struct cache_head *citem) { + struct svc_expkey *new = container_of(cnew, struct svc_expkey, h); + struct svc_expkey *item = container_of(citem, struct svc_expkey, h); + new->ek_mnt = mntget(item->ek_mnt); new->ek_dentry = dget(item->ek_dentry); } -static DefineSimpleCacheLookup(svc_expkey, svc_expkey) +static struct cache_head *expkey_alloc(void) +{ + struct svc_expkey *i = kmalloc(sizeof(*i), GFP_KERNEL); + if (i) + return &i->h; + else + return NULL; +} + +struct cache_detail svc_expkey_cache = { + .owner = THIS_MODULE, + .hash_size = EXPKEY_HASHMAX, + .hash_table = expkey_table, + .name = "nfsd.fh", + .cache_put = expkey_put, + .cache_request = expkey_request, + .cache_parse = expkey_parse, + .cache_show = expkey_show, + .match = expkey_match, + .init = expkey_init, + .update = expkey_update, + .alloc = expkey_alloc, +}; + +static struct svc_expkey * +svc_expkey_lookup(struct svc_expkey *item) +{ + struct cache_head *ch; + int hash = item->ek_fsidtype; + char * cp = (char*)item->ek_fsid; + int len = key_len(item->ek_fsidtype); + + hash ^= hash_mem(cp, len, EXPKEY_HASHBITS); + hash ^= hash_ptr(item->ek_client, EXPKEY_HASHBITS); + hash &= EXPKEY_HASHMASK; + + ch = sunrpc_cache_lookup(&svc_expkey_cache, &item->h, + hash); + if (ch) + return container_of(ch, struct svc_expkey, h); + else + return NULL; +} + +static struct svc_expkey * +svc_expkey_update(struct svc_expkey *new, struct svc_expkey *old) +{ + struct cache_head *ch; + int hash = new->ek_fsidtype; + char * cp = (char*)new->ek_fsid; + int len = key_len(new->ek_fsidtype); + + hash ^= hash_mem(cp, len, EXPKEY_HASHBITS); + hash ^= hash_ptr(new->ek_client, EXPKEY_HASHBITS); + hash &= EXPKEY_HASHMASK; + + ch = sunrpc_cache_update(&svc_expkey_cache, &new->h, + &old->h, hash); + if (ch) + return container_of(ch, struct svc_expkey, h); + else + return NULL; +} + #define EXPORT_HASHBITS 8 #define EXPORT_HASHMAX (1<< EXPORT_HASHBITS) @@ -549,7 +609,7 @@ exp_find_key(svc_client *clp, int fsid_type, u32 *fsidv, struct cache_req *reqp) key.ek_fsidtype = fsid_type; memcpy(key.ek_fsid, fsidv, key_len(fsid_type)); - ek = svc_expkey_lookup(&key, 0); + ek = svc_expkey_lookup(&key); if (ek != NULL) if ((err = cache_check(&svc_expkey_cache, &ek->h, reqp))) ek = ERR_PTR(err); @@ -569,7 +629,9 @@ static int exp_set_key(svc_client *clp, int fsid_type, u32 *fsidv, key.h.expiry_time = NEVER; key.h.flags = 0; - ek = svc_expkey_lookup(&key, 1); + ek = svc_expkey_lookup(&key); + if (ek) + ek = svc_expkey_update(&key,ek); if (ek) { expkey_put(&ek->h, &svc_expkey_cache); return 0; |
