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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2010-08-13 10:37:30 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-08-13 10:37:30 -0700 |
| commit | 2897c684d1d5140e0e0302e73660c7cb97981b27 (patch) | |
| tree | 8132776c20aeaa8ec6703ea782afd44ffc76e3ce /fs/nfs | |
| parent | c029b55af7d6b02b993e8a5add78d062da7a3940 (diff) | |
| parent | 3f43231230664c23f4a7513232171dcb6ce9f068 (diff) | |
Merge git://git.kernel.org/pub/scm/linux/kernel/git/sfrench/cifs-2.6
* git://git.kernel.org/pub/scm/linux/kernel/git/sfrench/cifs-2.6:
[NFS] Set CONFIG_KEYS when CONFIG_NFS_USE_KERNEL_DNS is set
AFS: Implement an autocell mount capability [ver #2]
DNS: If the DNS server returns an error, allow that to be cached [ver #2]
NFS: Use kernel DNS resolver [ver #2]
cifs: update README to include details about 'fsc' option
Diffstat (limited to 'fs/nfs')
| -rw-r--r-- | fs/nfs/Kconfig | 17 | ||||
| -rw-r--r-- | fs/nfs/dns_resolve.c | 24 | ||||
| -rw-r--r-- | fs/nfs/dns_resolve.h | 12 |
3 files changed, 53 insertions, 0 deletions
diff --git a/fs/nfs/Kconfig b/fs/nfs/Kconfig index cc1bb33b59b8..26a510a7be09 100644 --- a/fs/nfs/Kconfig +++ b/fs/nfs/Kconfig @@ -100,3 +100,20 @@ 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 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 diff --git a/fs/nfs/dns_resolve.h b/fs/nfs/dns_resolve.h index a3f0938babf7..199bb5543a91 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); |