From 1b340d0118da1d7c60c664f17d7c8fce2bb1cd9d Mon Sep 17 00:00:00 2001 From: Stanislav Kinsbursky Date: Fri, 25 Nov 2011 17:13:04 +0300 Subject: NFS: DNS resolver cache per network namespace context introduced This patch implements DNS resolver cache creation and registration for each alive network namespace context. This was done by registering NFS per-net operations, responsible for DNS cache allocation/register and unregister/destructioning instead of initialization and destruction of static "nfs_dns_resolve" cache detail (this one was removed). Pointer to network dns resolver cache is stored in new per-net "nfs_net" structure. This patch also changes nfs_dns_resolve_name() function prototype (and it's calls) by adding network pointer parameter, which is used to get proper DNS resolver cache pointer for do_cache_lookup_wait() call. Note: empty nfs_dns_resolver_init() and nfs_dns_resolver_destroy() functions will be used in next patch in the series. Signed-off-by: Stanislav Kinsbursky Signed-off-by: Trond Myklebust --- fs/nfs/dns_resolve.c | 96 ++++++++++++++++++++++++++++++++++------------------ 1 file changed, 63 insertions(+), 33 deletions(-) (limited to 'fs/nfs/dns_resolve.c') diff --git a/fs/nfs/dns_resolve.c b/fs/nfs/dns_resolve.c index 3cbf4b88f827..9aea78ab86ac 100644 --- a/fs/nfs/dns_resolve.c +++ b/fs/nfs/dns_resolve.c @@ -11,7 +11,7 @@ #include #include -ssize_t nfs_dns_resolve_name(char *name, size_t namelen, +ssize_t nfs_dns_resolve_name(struct net *net, char *name, size_t namelen, struct sockaddr *sa, size_t salen) { ssize_t ret; @@ -43,12 +43,11 @@ ssize_t nfs_dns_resolve_name(char *name, size_t namelen, #include "dns_resolve.h" #include "cache_lib.h" +#include "netns.h" #define NFS_DNS_HASHBITS 4 #define NFS_DNS_HASHTBL_SIZE (1 << NFS_DNS_HASHBITS) -static struct cache_head *nfs_dns_table[NFS_DNS_HASHTBL_SIZE]; - struct nfs_dns_ent { struct cache_head h; @@ -259,21 +258,6 @@ out: return ret; } -static struct cache_detail nfs_dns_resolve = { - .owner = THIS_MODULE, - .hash_size = NFS_DNS_HASHTBL_SIZE, - .hash_table = nfs_dns_table, - .name = "dns_resolve", - .cache_put = nfs_dns_ent_put, - .cache_upcall = nfs_dns_upcall, - .cache_parse = nfs_dns_parse, - .cache_show = nfs_dns_show, - .match = nfs_dns_match, - .init = nfs_dns_ent_init, - .update = nfs_dns_ent_update, - .alloc = nfs_dns_ent_alloc, -}; - static int do_cache_lookup(struct cache_detail *cd, struct nfs_dns_ent *key, struct nfs_dns_ent **item, @@ -336,8 +320,8 @@ out: return ret; } -ssize_t nfs_dns_resolve_name(char *name, size_t namelen, - struct sockaddr *sa, size_t salen) +ssize_t nfs_dns_resolve_name(struct net *net, char *name, + size_t namelen, struct sockaddr *sa, size_t salen) { struct nfs_dns_ent key = { .hostname = name, @@ -345,37 +329,83 @@ ssize_t nfs_dns_resolve_name(char *name, size_t namelen, }; struct nfs_dns_ent *item = NULL; ssize_t ret; + struct nfs_net *nn = net_generic(net, nfs_net_id); - ret = do_cache_lookup_wait(&nfs_dns_resolve, &key, &item); + ret = do_cache_lookup_wait(nn->nfs_dns_resolve, &key, &item); if (ret == 0) { if (salen >= item->addrlen) { memcpy(sa, &item->addr, item->addrlen); ret = item->addrlen; } else ret = -EOVERFLOW; - cache_put(&item->h, &nfs_dns_resolve); + cache_put(&item->h, nn->nfs_dns_resolve); } else if (ret == -ENOENT) ret = -ESRCH; return ret; } -int nfs_dns_resolver_init(void) +int nfs_dns_resolver_cache_init(struct net *net) { - int err; + int err = -ENOMEM; + struct nfs_net *nn = net_generic(net, nfs_net_id); + struct cache_detail *cd; + struct cache_head **tbl; + + cd = kzalloc(sizeof(struct cache_detail), GFP_KERNEL); + if (cd == NULL) + goto err_cd; + + tbl = kzalloc(NFS_DNS_HASHTBL_SIZE * sizeof(struct cache_head *), + GFP_KERNEL); + if (tbl == NULL) + goto err_tbl; + + cd->owner = THIS_MODULE, + cd->hash_size = NFS_DNS_HASHTBL_SIZE, + cd->hash_table = tbl, + cd->name = "dns_resolve", + cd->cache_put = nfs_dns_ent_put, + cd->cache_upcall = nfs_dns_upcall, + cd->cache_parse = nfs_dns_parse, + cd->cache_show = nfs_dns_show, + cd->match = nfs_dns_match, + cd->init = nfs_dns_ent_init, + cd->update = nfs_dns_ent_update, + cd->alloc = nfs_dns_ent_alloc, + + nfs_cache_init(cd); + err = nfs_cache_register_net(net, cd); + if (err) + goto err_reg; + nn->nfs_dns_resolve = cd; + return 0; - nfs_cache_init(&nfs_dns_resolve); - err = nfs_cache_register_net(&init_net, &nfs_dns_resolve); - if (err) { - nfs_cache_destroy(&nfs_dns_resolve); - return err; - } +err_reg: + nfs_cache_destroy(cd); + kfree(cd->hash_table); +err_tbl: + kfree(cd); +err_cd: + return err; +} + +void nfs_dns_resolver_cache_destroy(struct net *net) +{ + struct nfs_net *nn = net_generic(net, nfs_net_id); + struct cache_detail *cd = nn->nfs_dns_resolve; + + nfs_cache_unregister_net(net, cd); + nfs_cache_destroy(cd); + kfree(cd->hash_table); + kfree(cd); +} + +int nfs_dns_resolver_init(void) +{ return 0; } void nfs_dns_resolver_destroy(void) { - nfs_cache_unregister_net(&init_net, &nfs_dns_resolve); - nfs_cache_destroy(&nfs_dns_resolve); } - #endif -- cgit v1.2.3