1 files changed, 68 insertions, 0 deletions

diff --git a/fs/cifs/fscache.c b/fs/cifs/fscache.c
index eba9beb94a4c..6c8d96758ddb 100644
--- a/fs/cifs/fscache.c
+++ b/fs/cifs/fscache.c
@@ -21,6 +21,7 @@
 #include "fscache.h"
 #include "cifsglob.h"
 #include "cifs_debug.h"
+#include "cifs_fs_sb.h"
 
 void cifs_fscache_get_client_cookie(struct TCP_Server_Info *server)
 {
@@ -56,3 +57,70 @@ void cifs_fscache_release_super_cookie(struct cifsTconInfo *tcon)
         fscache_relinquish_cookie(tcon->fscache, 0);
         tcon->fscache = NULL;
 }
+
+static void cifs_fscache_enable_inode_cookie(struct inode *inode)
+{
+        struct cifsInodeInfo *cifsi = CIFS_I(inode);
+        struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
+
+        if (cifsi->fscache)
+                return;
+
+        cifsi->fscache = fscache_acquire_cookie(cifs_sb->tcon->fscache,
+                                &cifs_fscache_inode_object_def,
+                                cifsi);
+        cFYI(1, "CIFS: got FH cookie (0x%p/0x%p)",
+                        cifs_sb->tcon->fscache, cifsi->fscache);
+}
+
+void cifs_fscache_release_inode_cookie(struct inode *inode)
+{
+        struct cifsInodeInfo *cifsi = CIFS_I(inode);
+
+        if (cifsi->fscache) {
+                cFYI(1, "CIFS releasing inode cookie (0x%p)",
+                                cifsi->fscache);
+                fscache_relinquish_cookie(cifsi->fscache, 0);
+                cifsi->fscache = NULL;
+        }
+}
+
+static void cifs_fscache_disable_inode_cookie(struct inode *inode)
+{
+        struct cifsInodeInfo *cifsi = CIFS_I(inode);
+
+        if (cifsi->fscache) {
+                cFYI(1, "CIFS disabling inode cookie (0x%p)",
+                                cifsi->fscache);
+                fscache_relinquish_cookie(cifsi->fscache, 1);
+                cifsi->fscache = NULL;
+        }
+}
+
+void cifs_fscache_set_inode_cookie(struct inode *inode, struct file *filp)
+{
+        if ((filp->f_flags & O_ACCMODE) != O_RDONLY)
+                cifs_fscache_disable_inode_cookie(inode);
+        else {
+                cifs_fscache_enable_inode_cookie(inode);
+                cFYI(1, "CIFS: fscache inode cookie set");
+        }
+}
+
+void cifs_fscache_reset_inode_cookie(struct inode *inode)
+{
+        struct cifsInodeInfo *cifsi = CIFS_I(inode);
+        struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
+        struct fscache_cookie *old = cifsi->fscache;
+
+        if (cifsi->fscache) {
+                /* retire the current fscache cache and get a new one */
+                fscache_relinquish_cookie(cifsi->fscache, 1);
+
+                cifsi->fscache = fscache_acquire_cookie(cifs_sb->tcon->fscache,
+                                        &cifs_fscache_inode_object_def,
+                                        cifsi);
+                cFYI(1, "CIFS: new cookie 0x%p oldcookie 0x%p",
+                                cifsi->fscache, old);
+        }
+}