cifs: FS-Cache page management

Takes care of invalidation and release of FS-Cache marked pages and also
invalidation of the FsCache page flag when the inode is removed.

Signed-off-by: Suresh Jayaraman <sjayaraman@suse.de>
Acked-by: David Howells <dhowells@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>

1 files changed, 31 insertions, 0 deletions

diff --git a/fs/cifs/cache.c b/fs/cifs/cache.c
index b2649cfd3a04..224d7bbd1fcc 100644
--- a/fs/cifs/cache.c
+++ b/fs/cifs/cache.c
@@ -290,6 +290,36 @@ fscache_checkaux cifs_fscache_inode_check_aux(void *cookie_netfs_data,
         return FSCACHE_CHECKAUX_OKAY;
 }
 
+static void cifs_fscache_inode_now_uncached(void *cookie_netfs_data)
+{
+        struct cifsInodeInfo *cifsi = cookie_netfs_data;
+        struct pagevec pvec;
+        pgoff_t first;
+        int loop, nr_pages;
+
+        pagevec_init(&pvec, 0);
+        first = 0;
+
+        cFYI(1, "cifs inode 0x%p now uncached", cifsi);
+
+        for (;;) {
+                nr_pages = pagevec_lookup(&pvec,
+                                          cifsi->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();
+        }
+}
+
 const struct fscache_cookie_def cifs_fscache_inode_object_def = {
         .name           = "CIFS.uniqueid",
         .type           = FSCACHE_COOKIE_TYPE_DATAFILE,
@@ -297,4 +327,5 @@ const struct fscache_cookie_def cifs_fscache_inode_object_def = {
         .get_attr       = cifs_fscache_inode_get_attr,
         .get_aux        = cifs_fscache_inode_get_aux,
         .check_aux      = cifs_fscache_inode_check_aux,
+        .now_uncached   = cifs_fscache_inode_now_uncached,
 };