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authorDavid Howells <dhowells@redhat.com>2017-11-02 15:27:50 +0000
committerDavid Howells <dhowells@redhat.com>2017-11-13 15:38:18 +0000
commit989782dcdc91a5e6d5999c7a52a84a60a0811e56 (patch)
tree138ed46554536280e0d4d1834a16c28740e8cdae /fs/afs/main.c
parentbe080a6f43c40976afc950ee55e9b7f8e2b53525 (diff)
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afs: Overhaul cell database management
Overhaul the way that the in-kernel AFS client keeps track of cells in the following manner: (1) Cells are now held in an rbtree to make walking them quicker and RCU managed (though this is probably overkill). (2) Cells now have a manager work item that: (A) Looks after fetching and refreshing the VL server list. (B) Manages cell record lifetime, including initialising and destruction. (B) Manages cell record caching whereby threads are kept around for a certain time after last use and then destroyed. (C) Manages the FS-Cache index cookie for a cell. It is not permitted for a cookie to be in use twice, so we have to be careful to not allow a new cell record to exist at the same time as an old record of the same name. (3) Each AFS network namespace is given a manager work item that manages the cells within it, maintaining a single timer to prod cells into updating their DNS records. This uses the reduce_timer() facility to make the timer expire at the soonest timed event that needs happening. (4) When a module is being unloaded, cells and cell managers are now counted out using dec_after_work() to make sure the module text is pinned until after the data structures have been cleaned up. (5) Each cell's VL server list is now protected by a seqlock rather than a semaphore. Signed-off-by: David Howells <dhowells@redhat.com>
Diffstat (limited to 'fs/afs/main.c')
-rw-r--r--fs/afs/main.c16
1 files changed, 11 insertions, 5 deletions
diff --git a/fs/afs/main.c b/fs/afs/main.c
index 010e2e1a40f4..e7f87d723761 100644
--- a/fs/afs/main.c
+++ b/fs/afs/main.c
@@ -46,12 +46,15 @@ static int __net_init afs_net_init(struct afs_net *net)
INIT_WORK(&net->charge_preallocation_work, afs_charge_preallocation);
mutex_init(&net->socket_mutex);
- INIT_LIST_HEAD(&net->cells);
- rwlock_init(&net->cells_lock);
- init_rwsem(&net->cells_sem);
- init_waitqueue_head(&net->cells_freeable_wq);
- init_rwsem(&net->proc_cells_sem);
+
+ net->cells = RB_ROOT;
+ seqlock_init(&net->cells_lock);
+ INIT_WORK(&net->cells_manager, afs_manage_cells);
+ timer_setup(&net->cells_timer, afs_cells_timer, 0);
+
+ spin_lock_init(&net->proc_cells_lock);
INIT_LIST_HEAD(&net->proc_cells);
+
INIT_LIST_HEAD(&net->vl_updates);
INIT_LIST_HEAD(&net->vl_graveyard);
INIT_DELAYED_WORK(&net->vl_reaper, afs_vlocation_reaper);
@@ -83,11 +86,14 @@ static int __net_init afs_net_init(struct afs_net *net)
return 0;
error_open_socket:
+ net->live = false;
afs_vlocation_purge(net);
afs_cell_purge(net);
error_cell_init:
+ net->live = false;
afs_proc_cleanup(net);
error_proc:
+ net->live = false;
return ret;
}