NFS: client needs to maintain list of inodes with active layouts

[mv-sheeva.git] / fs / nfs / pnfs.h

diff --git a/fs/nfs/pnfs.h b/fs/nfs/pnfs.h
index 61531f3385761d7ed7db6536ae8ac8bd15d53fc0..1c3eb02f494421160b2da9774489764a2f3246dc 100644 (file)
--- a/fs/nfs/pnfs.h
+++ b/fs/nfs/pnfs.h
@@ -30,10 +30,22 @@
 #ifndef FS_NFS_PNFS_H
 #define FS_NFS_PNFS_H
 
+struct pnfs_layout_segment {
+       struct list_head fi_list;
+       u32 iomode;
+       struct kref kref;
+       struct pnfs_layout_hdr *layout;
+};
+
 #ifdef CONFIG_NFS_V4_1
 
 #define LAYOUT_NFSV4_1_MODULE_PREFIX "nfs-layouttype4"
 
+enum {
+       NFS_LAYOUT_RO_FAILED = 0,       /* get ro layout failed stop trying */
+       NFS_LAYOUT_RW_FAILED,           /* get rw layout failed stop trying */
+};
+
 /* Per-layout driver specific registration structure */
 struct pnfs_layoutdriver_type {
        struct list_head pnfs_tblid;
@@ -44,14 +56,55 @@ struct pnfs_layoutdriver_type {
        int (*uninitialize_mountpoint) (struct nfs_server *);
 };
 
+struct pnfs_layout_hdr {
+       unsigned long           refcount;
+       struct list_head        layouts;   /* other client layouts */
+       struct list_head        segs;      /* layout segments list */
+       unsigned long           state;
+       struct inode            *inode;
+};
+
 extern int pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *);
 extern void pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *);
 
+struct pnfs_layout_segment *
+pnfs_update_layout(struct inode *ino, struct nfs_open_context *ctx,
+                  enum pnfs_iomode access_type);
 void set_pnfs_layoutdriver(struct nfs_server *, u32 id);
 void unset_pnfs_layoutdriver(struct nfs_server *);
+void pnfs_destroy_layout(struct nfs_inode *);
+void pnfs_destroy_all_layouts(struct nfs_client *);
+
+
+static inline int lo_fail_bit(u32 iomode)
+{
+       return iomode == IOMODE_RW ?
+                        NFS_LAYOUT_RW_FAILED : NFS_LAYOUT_RO_FAILED;
+}
+
+/* Return true if a layout driver is being used for this mountpoint */
+static inline int pnfs_enabled_sb(struct nfs_server *nfss)
+{
+       return nfss->pnfs_curr_ld != NULL;
+}
 
 #else  /* CONFIG_NFS_V4_1 */
 
+static inline void pnfs_destroy_all_layouts(struct nfs_client *clp)
+{
+}
+
+static inline void pnfs_destroy_layout(struct nfs_inode *nfsi)
+{
+}
+
+static inline struct pnfs_layout_segment *
+pnfs_update_layout(struct inode *ino, struct nfs_open_context *ctx,
+                  enum pnfs_iomode access_type)
+{
+       return NULL;
+}
+
 static inline void set_pnfs_layoutdriver(struct nfs_server *s, u32 id)
 {
 }