afs: Provide a way to configure address priorities

[linux-2.6-block.git] / fs / afs / internal.h

diff --git a/fs/afs/internal.h b/fs/afs/internal.h
index ae33dd8ae49bfcc545e705e6faa8a20059ee08da..4445c734cdcd918196a37d77e737e8ad772bd363 100644 (file)
--- a/fs/afs/internal.h
+++ b/fs/afs/internal.h
@@ -72,6 +72,28 @@ enum afs_call_state {
        AFS_CALL_COMPLETE,              /* Completed or failed */
 };
 
+/*
+ * Address preferences.
+ */
+struct afs_addr_preference {
+       union {
+               struct in_addr  ipv4_addr;      /* AF_INET address to compare against */
+               struct in6_addr ipv6_addr;      /* AF_INET6 address to compare against */
+       };
+       sa_family_t             family;         /* Which address to use */
+       u16                     prio;           /* Priority */
+       u8                      subnet_mask;    /* How many bits to compare */
+};
+
+struct afs_addr_preference_list {
+       struct rcu_head         rcu;
+       u16                     version;        /* Incremented when prefs list changes */
+       u8                      ipv6_off;       /* Offset of IPv6 addresses */
+       u8                      nr;             /* Number of addresses in total */
+       u8                      max_prefs;      /* Number of prefs allocated */
+       struct afs_addr_preference prefs[] __counted_by(max_prefs);
+};
+
 struct afs_address {
        struct rxrpc_peer       *peer;
        short                   last_error;     /* Last error from this address */
@@ -315,6 +337,8 @@ struct afs_net {
        struct proc_dir_entry   *proc_afs;      /* /proc/net/afs directory */
        struct afs_sysnames     *sysnames;
        rwlock_t                sysnames_lock;
+       struct afs_addr_preference_list __rcu *address_prefs;
+       u16                     address_pref_version;
 
        /* Statistics counters */
        atomic_t                n_lookup;       /* Number of lookups done */
@@ -982,6 +1006,11 @@ extern int afs_merge_fs_addr4(struct afs_net *net, struct afs_addr_list *addr,
 extern int afs_merge_fs_addr6(struct afs_net *net, struct afs_addr_list *addr,
                              __be32 *xdr, u16 port);
 
+/*
+ * addr_prefs.c
+ */
+int afs_proc_addr_prefs_write(struct file *file, char *buf, size_t size);
+
 /*
  * callback.c
  */