[CIFS] DNS name resolution helper upcall for cifs
Adds additional option CIFS_DFS_UPCALL to fs/Kconfig for enabling
DFS support. Resolved IP address is saved as a string in the
key payload.
Igor has a series of related patches that will follow which finish up
CIFS DFS support
Acked-by: Igor Mammedov <niallain@gmail.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c
index 093beaa..000b4a5 100644
--- a/fs/cifs/cifsfs.c
+++ b/fs/cifs/cifsfs.c
@@ -44,6 +44,7 @@
#include "cifs_fs_sb.h"
#include <linux/mm.h>
#include <linux/key-type.h>
+#include "dns_resolve.h"
#include "cifs_spnego.h"
#define CIFS_MAGIC_NUMBER 0xFF534D42 /* the first four bytes of SMB PDUs */
@@ -1015,11 +1016,16 @@
if (rc)
goto out_unregister_filesystem;
#endif
+#ifdef CONFIG_CIFS_DFS_UPCALL
+ rc = register_key_type(&key_type_dns_resolver);
+ if (rc)
+ goto out_unregister_key_type;
+#endif
oplockThread = kthread_run(cifs_oplock_thread, NULL, "cifsoplockd");
if (IS_ERR(oplockThread)) {
rc = PTR_ERR(oplockThread);
cERROR(1, ("error %d create oplock thread", rc));
- goto out_unregister_key_type;
+ goto out_unregister_dfs_key_type;
}
dnotifyThread = kthread_run(cifs_dnotify_thread, NULL, "cifsdnotifyd");
@@ -1033,7 +1039,11 @@
out_stop_oplock_thread:
kthread_stop(oplockThread);
+ out_unregister_dfs_key_type:
+#ifdef CONFIG_CIFS_DFS_UPCALL
+ unregister_key_type(&key_type_dns_resolver);
out_unregister_key_type:
+#endif
#ifdef CONFIG_CIFS_UPCALL
unregister_key_type(&cifs_spnego_key_type);
out_unregister_filesystem:
@@ -1059,6 +1069,9 @@
#ifdef CONFIG_PROC_FS
cifs_proc_clean();
#endif
+#ifdef CONFIG_CIFS_DFS_UPCALL
+ unregister_key_type(&key_type_dns_resolver);
+#endif
#ifdef CONFIG_CIFS_UPCALL
unregister_key_type(&cifs_spnego_key_type);
#endif