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authorDavid Howells <dhowells@redhat.com>2017-11-02 15:27:45 +0000
committerDavid Howells <dhowells@redhat.com>2017-11-13 15:38:16 +0000
commitf044c8847bb61eff5e1e95b6f6bb950e7f4a73a4 (patch)
tree412d51db7427f56e7aaef68c8bfe5714879cff88 /fs/afs/callback.c
parent5e4def20381678ba3ce0a4e117f97e378ecd81bc (diff)
afs: Lay the groundwork for supporting network namespaces
Lay the groundwork for supporting network namespaces (netns) to the AFS filesystem by moving various global features to a network-namespace struct (afs_net) and providing an instance of this as a temporary global variable that everything uses via accessor functions for the moment. The following changes have been made: (1) Store the netns in the superblock info. This will be obtained from the mounter's nsproxy on a manual mount and inherited from the parent superblock on an automount. (2) The cell list is made per-netns. It can be viewed through /proc/net/afs/cells and also be modified by writing commands to that file. (3) The local workstation cell is set per-ns in /proc/net/afs/rootcell. This is unset by default. (4) The 'rootcell' module parameter, which sets a cell and VL server list modifies the init net namespace, thereby allowing an AFS root fs to be theoretically used. (5) The volume location lists and the file lock manager are made per-netns. (6) The AF_RXRPC socket and associated I/O bits are made per-ns. The various workqueues remain global for the moment. Changes still to be made: (1) /proc/fs/afs/ should be moved to /proc/net/afs/ and a symlink emplaced from the old name. (2) A per-netns subsys needs to be registered for AFS into which it can store its per-netns data. (3) Rather than the AF_RXRPC socket being opened on module init, it needs to be opened on the creation of a superblock in that netns. (4) The socket needs to be closed when the last superblock using it is destroyed and all outstanding client calls on it have been completed. This prevents a reference loop on the namespace. (5) It is possible that several namespaces will want to use AFS, in which case each one will need its own UDP port. These can either be set through /proc/net/afs/cm_port or the kernel can pick one at random. The init_ns gets 7001 by default. Other issues that need resolving: (1) The DNS keyring needs net-namespacing. (2) Where do upcalls go (eg. DNS request-key upcall)? (3) Need something like open_socket_in_file_ns() syscall so that AFS command line tools attempting to operate on an AFS file/volume have their RPC calls go to the right place. Signed-off-by: David Howells <dhowells@redhat.com>
Diffstat (limited to 'fs/afs/callback.c')
-rw-r--r--fs/afs/callback.c24
1 files changed, 2 insertions, 22 deletions
diff --git a/fs/afs/callback.c b/fs/afs/callback.c
index 25d404d22cae..d12dffb76b67 100644
--- a/fs/afs/callback.c
+++ b/fs/afs/callback.c
@@ -28,9 +28,7 @@ unsigned afs_vnode_update_timeout = 10;
CIRC_SPACE((server)->cb_break_head, (server)->cb_break_tail, \
ARRAY_SIZE((server)->cb_break))
-//static void afs_callback_updater(struct work_struct *);
-
-static struct workqueue_struct *afs_callback_update_worker;
+struct workqueue_struct *afs_callback_update_worker;
/*
* allow the fileserver to request callback state (re-)initialisation
@@ -343,7 +341,7 @@ void afs_dispatch_give_up_callbacks(struct work_struct *work)
* had callbacks entirely, and the server will call us later to break
* them
*/
- afs_fs_give_up_callbacks(server, true);
+ afs_fs_give_up_callbacks(server->cell->net, server, true);
}
/*
@@ -456,21 +454,3 @@ static void afs_callback_updater(struct work_struct *work)
afs_put_vnode(vl);
}
#endif
-
-/*
- * initialise the callback update process
- */
-int __init afs_callback_update_init(void)
-{
- afs_callback_update_worker = alloc_ordered_workqueue("kafs_callbackd",
- WQ_MEM_RECLAIM);
- return afs_callback_update_worker ? 0 : -ENOMEM;
-}
-
-/*
- * shut down the callback update process
- */
-void afs_callback_update_kill(void)
-{
- destroy_workqueue(afs_callback_update_worker);
-}