afs: Overhaul cell database management

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

diff --git a/fs/afs/internal.h b/fs/afs/internal.h
index 7c31866..51e3825 100644 (file)
--- a/fs/afs/internal.h
+++ b/fs/afs/internal.h
@@ -207,13 +207,14 @@ struct afs_net {
        atomic_t                nr_superblocks;
 
        /* Cell database */
-       struct list_head        cells;
+       struct rb_root          cells;
        struct afs_cell         *ws_cell;
-       rwlock_t                cells_lock;
-       struct rw_semaphore     cells_sem;
-       wait_queue_head_t       cells_freeable_wq;
+       struct work_struct      cells_manager;
+       struct timer_list       cells_timer;
+       atomic_t                cells_outstanding;
+       seqlock_t               cells_lock;
 
-       struct rw_semaphore     proc_cells_sem;
+       spinlock_t              proc_cells_lock;
        struct list_head        proc_cells;
 
        /* Volume location database */
@@ -242,14 +243,26 @@ struct afs_net {
 
 extern struct afs_net __afs_net;// Dummy AFS network namespace; TODO: replace with real netns
 
+enum afs_cell_state {
+       AFS_CELL_UNSET,
+       AFS_CELL_ACTIVATING,
+       AFS_CELL_ACTIVE,
+       AFS_CELL_DEACTIVATING,
+       AFS_CELL_INACTIVE,
+       AFS_CELL_FAILED,
+};
+
 /*
  * AFS cell record
  */
 struct afs_cell {
-       atomic_t                usage;
-       struct list_head        link;           /* main cell list link */
-       struct afs_net          *net;           /* The network namespace */
+       union {
+               struct rcu_head rcu;
+               struct rb_node  net_node;       /* Node in net->cells */
+       };
+       struct afs_net          *net;
        struct key              *anonymous_key; /* anonymous user key for this cell */
+       struct work_struct      manager;        /* Manager for init/deinit/dns */
        struct list_head        proc_link;      /* /proc cell list link */
 #ifdef CONFIG_AFS_FSCACHE
        struct fscache_cookie   *cache;         /* caching cookie */
@@ -262,12 +275,26 @@ struct afs_cell {
        /* volume location record management */
        struct rw_semaphore     vl_sem;         /* volume management serialisation semaphore */
        struct list_head        vl_list;        /* cell's active VL record list */
+       time64_t                dns_expiry;     /* Time AFSDB/SRV record expires */
+       time64_t                last_inactive;  /* Time of last drop of usage count */
+       atomic_t                usage;
+       unsigned long           flags;
+#define AFS_CELL_FL_NOT_READY  0               /* The cell record is not ready for use */
+#define AFS_CELL_FL_NO_GC      1               /* The cell was added manually, don't auto-gc */
+#define AFS_CELL_FL_NOT_FOUND  2               /* Permanent DNS error */
+#define AFS_CELL_FL_DNS_FAIL   3               /* Failed to access DNS */
+       enum afs_cell_state     state;
+       short                   error;
+
        spinlock_t              vl_lock;        /* vl_list lock */
+
+       /* VLDB server list. */
+       seqlock_t               vl_addrs_lock;
        unsigned short          vl_naddrs;      /* number of VL servers in addr list */
        unsigned short          vl_curr_svix;   /* current server index */
        struct sockaddr_rxrpc   vl_addrs[AFS_CELL_MAX_ADDRS];   /* cell VL server addresses */
-
-       char                    name[0];        /* cell name - must go last */
+       u8                      name_len;       /* Length of name */
+       char                    name[64 + 1];   /* Cell name, case-flattened and NUL-padded */
 };
 
 /*
@@ -494,17 +521,20 @@ static inline struct afs_cb_interest *afs_get_cb_interest(struct afs_cb_interest
 /*
  * cell.c
  */
-static inline struct afs_cell *afs_get_cell(struct afs_cell *cell)
+ static inline struct afs_cell *afs_get_cell(struct afs_cell *cell)
 {
        if (cell)
                atomic_inc(&cell->usage);
        return cell;
 }
-extern int afs_cell_init(struct afs_net *, char *);
-extern struct afs_cell *afs_cell_create(struct afs_net *, const char *, unsigned, char *, bool);
-extern struct afs_cell *afs_cell_lookup(struct afs_net *, const char *, unsigned, bool);
-extern struct afs_cell *afs_grab_cell(struct afs_cell *);
+
+extern int afs_cell_init(struct afs_net *, const char *);
+extern struct afs_cell *afs_lookup_cell_rcu(struct afs_net *, const char *, unsigned);
+extern struct afs_cell *afs_lookup_cell(struct afs_net *, const char *, unsigned,
+                                       const char *, bool);
 extern void afs_put_cell(struct afs_net *, struct afs_cell *);
+extern void afs_manage_cells(struct work_struct *);
+extern void afs_cells_timer(struct timer_list *);
 extern void __net_exit afs_cell_purge(struct afs_net *);
 
 /*