From: NeilBrown Date: Mon, 27 Mar 2006 09:15:03 +0000 (-0800) Subject: [PATCH] knfsd: Use new cache_lookup for svc_export X-Git-Tag: v2.6.17-rc1~434 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4f7774c3a0558526c0faaf525581f2029480b313;p=linux-2.6 [PATCH] knfsd: Use new cache_lookup for svc_export Signed-off-by: Neil Brown Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/fs/nfsd/export.c b/fs/nfsd/export.c index c591761a1a..2ebd77d758 100644 --- a/fs/nfsd/export.c +++ b/fs/nfsd/export.c @@ -258,16 +258,6 @@ static DefineSimpleCacheLookup(svc_expkey, svc_expkey) static struct cache_head *export_table[EXPORT_HASHMAX]; -static inline int svc_export_hash(struct svc_export *item) -{ - int rv; - - rv = hash_ptr(item->ex_client, EXPORT_HASHBITS); - rv ^= hash_ptr(item->ex_dentry, EXPORT_HASHBITS); - rv ^= hash_ptr(item->ex_mnt, EXPORT_HASHBITS); - return rv; -} - void svc_export_put(struct cache_head *item, struct cache_detail *cd) { if (cache_put(item, cd)) { @@ -298,7 +288,8 @@ static void svc_export_request(struct cache_detail *cd, (*bpp)[-1] = '\n'; } -static struct svc_export *svc_export_lookup(struct svc_export *, int); +struct svc_export *svc_export_update(struct svc_export *new, struct svc_export *old); +static struct svc_export *svc_export_lookup(struct svc_export *); static int check_export(struct inode *inode, int flags) { @@ -411,11 +402,16 @@ static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen) if (err) goto out; } - expp = svc_export_lookup(&exp, 1); + expp = svc_export_lookup(&exp); if (expp) - exp_put(expp); - err = 0; + expp = svc_export_update(&exp, expp); + else + err = -ENOMEM; cache_flush(); + if (expp == NULL) + err = -ENOMEM; + else + exp_put(expp); out: if (nd.dentry) path_release(&nd); @@ -449,40 +445,95 @@ static int svc_export_show(struct seq_file *m, seq_puts(m, ")\n"); return 0; } -struct cache_detail svc_export_cache = { - .owner = THIS_MODULE, - .hash_size = EXPORT_HASHMAX, - .hash_table = export_table, - .name = "nfsd.export", - .cache_put = svc_export_put, - .cache_request = svc_export_request, - .cache_parse = svc_export_parse, - .cache_show = svc_export_show, -}; - -static inline int svc_export_match(struct svc_export *a, struct svc_export *b) +static int svc_export_match(struct cache_head *a, struct cache_head *b) { - return a->ex_client == b->ex_client && - a->ex_dentry == b->ex_dentry && - a->ex_mnt == b->ex_mnt; + struct svc_export *orig = container_of(a, struct svc_export, h); + struct svc_export *new = container_of(b, struct svc_export, h); + return orig->ex_client == new->ex_client && + orig->ex_dentry == new->ex_dentry && + orig->ex_mnt == new->ex_mnt; } -static inline void svc_export_init(struct svc_export *new, struct svc_export *item) + +static void svc_export_init(struct cache_head *cnew, struct cache_head *citem) { + struct svc_export *new = container_of(cnew, struct svc_export, h); + struct svc_export *item = container_of(citem, struct svc_export, h); + kref_get(&item->ex_client->ref); new->ex_client = item->ex_client; new->ex_dentry = dget(item->ex_dentry); new->ex_mnt = mntget(item->ex_mnt); } -static inline void svc_export_update(struct svc_export *new, struct svc_export *item) +static void export_update(struct cache_head *cnew, struct cache_head *citem) { + struct svc_export *new = container_of(cnew, struct svc_export, h); + struct svc_export *item = container_of(citem, struct svc_export, h); + new->ex_flags = item->ex_flags; new->ex_anon_uid = item->ex_anon_uid; new->ex_anon_gid = item->ex_anon_gid; new->ex_fsid = item->ex_fsid; } -static DefineSimpleCacheLookup(svc_export, svc_export) +static struct cache_head *svc_export_alloc(void) +{ + struct svc_export *i = kmalloc(sizeof(*i), GFP_KERNEL); + if (i) + return &i->h; + else + return NULL; +} + +struct cache_detail svc_export_cache = { + .owner = THIS_MODULE, + .hash_size = EXPORT_HASHMAX, + .hash_table = export_table, + .name = "nfsd.export", + .cache_put = svc_export_put, + .cache_request = svc_export_request, + .cache_parse = svc_export_parse, + .cache_show = svc_export_show, + .match = svc_export_match, + .init = svc_export_init, + .update = export_update, + .alloc = svc_export_alloc, +}; + +static struct svc_export * +svc_export_lookup(struct svc_export *exp) +{ + struct cache_head *ch; + int hash; + hash = hash_ptr(exp->ex_client, EXPORT_HASHBITS); + hash ^= hash_ptr(exp->ex_dentry, EXPORT_HASHBITS); + hash ^= hash_ptr(exp->ex_mnt, EXPORT_HASHBITS); + + ch = sunrpc_cache_lookup(&svc_export_cache, &exp->h, + hash); + if (ch) + return container_of(ch, struct svc_export, h); + else + return NULL; +} + +struct svc_export * +svc_export_update(struct svc_export *new, struct svc_export *old) +{ + struct cache_head *ch; + int hash; + hash = hash_ptr(old->ex_client, EXPORT_HASHBITS); + hash ^= hash_ptr(old->ex_dentry, EXPORT_HASHBITS); + hash ^= hash_ptr(old->ex_mnt, EXPORT_HASHBITS); + + ch = sunrpc_cache_update(&svc_export_cache, &new->h, + &old->h, + hash); + if (ch) + return container_of(ch, struct svc_export, h); + else + return NULL; +} struct svc_expkey * @@ -568,7 +619,7 @@ exp_get_by_name(svc_client *clp, struct vfsmount *mnt, struct dentry *dentry, key.ex_mnt = mnt; key.ex_dentry = dentry; - exp = svc_export_lookup(&key, 0); + exp = svc_export_lookup(&key); if (exp != NULL) switch (cache_check(&svc_export_cache, &exp->h, reqp)) { case 0: break; @@ -770,13 +821,13 @@ exp_export(struct nfsctl_export *nxp) new.ex_anon_gid = nxp->ex_anon_gid; new.ex_fsid = nxp->ex_dev; - exp = svc_export_lookup(&new, 1); + exp = svc_export_lookup(&new); + if (exp) + exp = svc_export_update(&new, exp); - if (exp == NULL) + if (!exp) goto finish; - err = 0; - if (exp_hash(clp, exp) || exp_fsid_hash(clp, exp)) { /* failed to create at least one index */