cifs: define inode-level cache object and register them

[net-next-2.6.git] / fs / cifs / fscache.c

diff --git a/fs/cifs/fscache.c b/fs/cifs/fscache.c
index eba9beb94a4c1fba3c23af95f185ce02a22bfdfa..6c8d96758ddb2e65d818dcdb6adc714ffeab63c9 100644 (file)
--- 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);
+       }
+}