AFS: implement statfs

Implement the statfs() op for AFS.

Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 52 insertions, 0 deletions

diff --git a/fs/afs/vnode.c b/fs/afs/vnode.c
index bea8bd9e7b2..c36c98ce2c3 100644
--- a/fs/afs/vnode.c
+++ b/fs/afs/vnode.c
@@ -869,3 +869,55 @@ no_server:
         spin_unlock(&vnode->lock);
         return PTR_ERR(server);
 }
+
+/*
+ * get the status of a volume
+ */
+int afs_vnode_get_volume_status(struct afs_vnode *vnode, struct key *key,
+                                struct afs_volume_status *vs)
+{
+        struct afs_server *server;
+        int ret;
+
+        _enter("%s{%x:%u.%u},%x,",
+               vnode->volume->vlocation->vldb.name,
+               vnode->fid.vid,
+               vnode->fid.vnode,
+               vnode->fid.unique,
+               key_serial(key));
+
+        /* this op will fetch the status */
+        spin_lock(&vnode->lock);
+        vnode->update_cnt++;
+        spin_unlock(&vnode->lock);
+
+        do {
+                /* pick a server to query */
+                server = afs_volume_pick_fileserver(vnode);
+                if (IS_ERR(server))
+                        goto no_server;
+
+                _debug("USING SERVER: %08x\n", ntohl(server->addr.s_addr));
+
+                ret = afs_fs_get_volume_status(server, key, vnode, vs, &afs_sync_call);
+
+        } while (!afs_volume_release_fileserver(vnode, server, ret));
+
+        /* adjust the flags */
+        if (ret == 0) {
+                afs_vnode_finalise_status_update(vnode, server);
+                afs_put_server(server);
+        } else {
+                afs_vnode_status_update_failed(vnode, ret);
+        }
+
+        _leave(" = %d", ret);
+        return ret;
+
+no_server:
+        spin_lock(&vnode->lock);
+        vnode->update_cnt--;
+        ASSERTCMP(vnode->update_cnt, >=, 0);
+        spin_unlock(&vnode->lock);
+        return PTR_ERR(server);
+}