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Message-ID: <4C6410D4.6050100@netapp.com>
Date: Thu, 12 Aug 2010 11:18:44 -0400
From: Bryan Schumaker <bjschuma@...app.com>
To: Stephen Rothwell <sfr@...b.auug.org.au>
CC: Steve French <smfrench@...il.com>, linux-cifs@...r.kernel.org,
linux-next@...r.kernel.org, linux-kernel@...r.kernel.org,
Wang Lei <wang840925@...il.com>,
David Howells <dhowells@...hat.com>
Subject: Re: linux-next: build failure after merge of the cifs tree
Hi
I updated my NFS DNS patch. The new version will set CONFIG_KEYS when CONFIG_NFS_USE_KERNEL_DNS is set.
Thanks for letting me know about this!
Bryan Schumaker
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@...app.com>
Acked-by: Trond Myklebust <Trond.Myklebust@...app.com>
---
Fix for KEYS dependency
fs/nfs/Kconfig | 16 ++++++++++++++++
fs/nfs/dns_resolve.c | 24 ++++++++++++++++++++++++
fs/nfs/dns_resolve.h | 12 ++++++++++++
3 files changed, 52 insertions(+), 0 deletions(-)
diff --git a/fs/nfs/Kconfig b/fs/nfs/Kconfig
index cc1bb33..c5bbdca 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
+ select KEYS
+ default y
diff --git a/fs/nfs/dns_resolve.c b/fs/nfs/dns_resolve.c
index 76fd235..dba50a5 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
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 08/12/2010 03:46 AM, Stephen Rothwell wrote:
> Hi Steve,
>
> On Wed, 11 Aug 2010 23:04:36 -0500 Steve French <smfrench@...il.com> wrote:
>>
>> Are you sure that this is a valid config file? CONFIG_KEYS should be
>> set if CONFIG_DNS_RESOLVER is set?
>
> It is a ppc64_defconfig. It has:
>
> # CONFIG_KEYS is not set
> CONFIG_DNS_RESOLVER=y
>
> CONFIG_NFS_USE_KERNEL_DNS just selects CONFIG_DNS_RESOLVER but there is
> no dependency on CONFIG_KEYS (select does not care about the
> dependencies of the selected config option).
>
>> key.h looks like it is included in all arch in this path
>>
>> net/dns_resolver/dns_key.c includes
>> include/keys/dns_resolver-type.h which includes
>> include/linux/key-type.h which includes
>> include/linux/key.h
>>
>> the line 258 "key_instantiate_and_link" error could occur if
>> "CONFIG_KEYS" is not set in .config
>
> Which t isn't.
>
>> net/dns_resolver/Kconfig config DNS_RESOLVER "depends on NET && KEYS"
>> so ... CONFIG_KEYS should be set ....
>
> See above. You need CONFIG_NFS_USE_KERNEL_DNS to also depend on
> CONFIG_KEYS ...
>
--
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