The patch is below. Thanks!
Bryan
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@xxxxxxxxxx>
diff --git a/fs/nfs/Kconfig b/fs/nfs/Kconfig
index a43d07e..10eebc5 100644
--- a/fs/nfs/Kconfig
+++ b/fs/nfs/Kconfig
@@ -100,3 +100,19 @@ config NFS_FSCACHE
help
Say Y here if you want NFS data to be cached locally on disc through
the general filesystem cache manager
+
+config NFS_USE_LEGACY_DNS
+ bool "Use the legacy NFS DNS resolver"
+ depends on NFS_V4
+ help
+ The kernel now provides a method for translating a host name into an
+ IP address. Select Y here if you would rather use your own DNS
+ resolver script.
+
+ If unsure, say N
+
+config NFS_USE_KERNEL_DNS
+ bool
+ depends on NFS_V4 && !NFS_USE_LEGACY_DNS
+ select DNS_RESOLVER
+ default y
diff --git a/fs/nfs/dns_resolve.c b/fs/nfs/dns_resolve.c
index 76fd235..7e5d3a9 100644
--- a/fs/nfs/dns_resolve.c
+++ b/fs/nfs/dns_resolve.c
@@ -6,6 +6,37 @@
* 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;
+}
+
+inline int nfs_dns_resolver_init(void)
+{
+ return 0;
+}
+
+inline void nfs_dns_resolver_destroy(void)
+{}
+
+#else
+
#include <linux/hash.h>
#include <linux/string.h>
#include <linux/kmod.h>
@@ -346,3 +377,4 @@ void nfs_dns_resolver_destroy(void)
nfs_cache_unregister(&nfs_dns_resolve);
}
+#endif
diff --git a/fs/nfs/dns_resolve.h b/fs/nfs/dns_resolve.h
index a3f0938..199bb55 100644
--- a/fs/nfs/dns_resolve.h
+++ b/fs/nfs/dns_resolve.h
@@ -6,8 +6,20 @@
#define NFS_DNS_HOSTNAME_MAXLEN (128)
+
+#ifdef CONFIG_NFS_USE_KERNEL_DNS
+static inline int nfs_dns_resolver_init(void)
+{
+ return 0;
+}
+
+static inline void nfs_dns_resolver_destroy(void)
+{}
+#else
extern int nfs_dns_resolver_init(void);
extern void nfs_dns_resolver_destroy(void);
+#endif
+
extern ssize_t nfs_dns_resolve_name(char *name, size_t namelen,
struct sockaddr *sa, size_t salen);
On 08/05/2010 10:05 PM, David Howells wrote:
> Trond Myklebust <Trond.Myklebust@xxxxxxxxxx> wrote:
>
>> David, can you carry this as part of your 'generic DNS resolver'
>> patchset?
>
> Probably. Can you send me a copy of the patch?
>
> David
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