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authorBryan Schumaker <bjschuma@netapp.com>2010-08-11 12:37:53 +0400
committerSteve French <sfrench@us.ibm.com>2010-08-11 21:11:28 +0400
commitc2e8139c9f797baa46515af6d350c51823736cbb (patch)
tree3f76dc108e94f2117a11b6230c496a0ce33c7621 /fs/nfs/dns_resolve.c
parent3694b91a59c3bc784735574878d36652dfd623c2 (diff)
downloadlinux-c2e8139c9f797baa46515af6d350c51823736cbb.tar.xz
NFS: Use kernel DNS resolver [ver #2]
Use the kernel DNS resolver to translate hostnames to IP addresses. Create a new config option to choose between the legacy DNS resolver and the new resolver. Signed-off-by: Bryan Schumaker <bjschuma@netapp.com> Acked-by: Trond Myklebust <Trond.Myklebust@netapp.com> Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
Diffstat (limited to 'fs/nfs/dns_resolve.c')
-rw-r--r--fs/nfs/dns_resolve.c24
1 files changed, 24 insertions, 0 deletions
diff --git a/fs/nfs/dns_resolve.c b/fs/nfs/dns_resolve.c
index 76fd235d0024..dba50a5625db 100644
--- a/fs/nfs/dns_resolve.c
+++ b/fs/nfs/dns_resolve.c
@@ -6,6 +6,29 @@
* Resolves DNS hostnames into valid ip addresses
*/
+#ifdef CONFIG_NFS_USE_KERNEL_DNS
+
+#include <linux/sunrpc/clnt.h>
+#include <linux/dns_resolver.h>
+
+ssize_t nfs_dns_resolve_name(char *name, size_t namelen,
+ struct sockaddr *sa, size_t salen)
+{
+ ssize_t ret;
+ char *ip_addr = NULL;
+ int ip_len;
+
+ ip_len = dns_query(NULL, name, namelen, NULL, &ip_addr, NULL);
+ if (ip_len > 0)
+ ret = rpc_pton(ip_addr, ip_len, sa, salen);
+ else
+ ret = -ESRCH;
+ kfree(ip_addr);
+ return ret;
+}
+
+#else
+
#include <linux/hash.h>
#include <linux/string.h>
#include <linux/kmod.h>
@@ -346,3 +369,4 @@ void nfs_dns_resolver_destroy(void)
nfs_cache_unregister(&nfs_dns_resolve);
}
+#endif