NFS: Invalidate FsCache page flags when cache removed

Invalidate the FsCache page flags on the pages belonging to an inode when the
cache backing that NFS inode is removed.

This allows a live cache to be withdrawn.

Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Steve Dickson <steved@redhat.com>
Acked-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Acked-by: Al Viro <viro@zeniv.linux.org.uk>
Tested-by: Daire Byrne <Daire.Byrne@framestore.com>

diff --git a/fs/nfs/fscache-index.c b/fs/nfs/fscache-index.c
index 7bc54acb7b009fb8ef33ede2cd91a28686a9fefa..a119b5691e7c649a7a84f8bd265a8da7193ab231 100644 (file)
--- a/fs/nfs/fscache-index.c
+++ b/fs/nfs/fscache-index.c
@@ -252,6 +252,45 @@ enum fscache_checkaux nfs_fscache_inode_check_aux(void *cookie_netfs_data,
        return FSCACHE_CHECKAUX_OKAY;
 }
 
+/*
+ * Indication from FS-Cache that the cookie is no longer cached
+ * - This function is called when the backing store currently caching a cookie
+ *   is removed
+ * - The netfs should use this to clean up any markers indicating cached pages
+ * - This is mandatory for any object that may have data
+ */
+static void nfs_fscache_inode_now_uncached(void *cookie_netfs_data)
+{
+       struct nfs_inode *nfsi = cookie_netfs_data;
+       struct pagevec pvec;
+       pgoff_t first;
+       int loop, nr_pages;
+
+       pagevec_init(&pvec, 0);
+       first = 0;
+
+       dprintk("NFS: nfs_inode_now_uncached: nfs_inode 0x%p\n", nfsi);
+
+       for (;;) {
+               /* grab a bunch of pages to unmark */
+               nr_pages = pagevec_lookup(&pvec,
+                                         nfsi->vfs_inode.i_mapping,
+                                         first,
+                                         PAGEVEC_SIZE - pagevec_count(&pvec));
+               if (!nr_pages)
+                       break;
+
+               for (loop = 0; loop < nr_pages; loop++)
+                       ClearPageFsCache(pvec.pages[loop]);
+
+               first = pvec.pages[nr_pages - 1]->index + 1;
+
+               pvec.nr = nr_pages;
+               pagevec_release(&pvec);
+               cond_resched();
+       }
+}
+
 /*
  * Define the inode object for FS-Cache.  This is used to describe an inode
  * object to fscache_acquire_cookie().  It is keyed by the NFS file handle for
@@ -268,4 +307,5 @@ const struct fscache_cookie_def nfs_fscache_inode_object_def = {
        .get_attr       = nfs_fscache_inode_get_attr,
        .get_aux        = nfs_fscache_inode_get_aux,
        .check_aux      = nfs_fscache_inode_check_aux,
+       .now_uncached   = nfs_fscache_inode_now_uncached,
 };