2 * pNFS client data structures.
5 * The Regents of the University of Michigan
8 * Dean Hildebrand <dhildebz@umich.edu>
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33 #ifdef CONFIG_NFS_V4_1
35 #define LAYOUT_NFSV4_1_MODULE_PREFIX "nfs-layouttype4"
38 NFS_LAYOUT_RO_FAILED = 0, /* get ro layout failed stop trying */
39 NFS_LAYOUT_RW_FAILED, /* get rw layout failed stop trying */
42 /* Per-layout driver specific registration structure */
43 struct pnfs_layoutdriver_type {
44 struct list_head pnfs_tblid;
48 int (*initialize_mountpoint) (struct nfs_server *);
49 int (*uninitialize_mountpoint) (struct nfs_server *);
52 struct pnfs_layout_hdr {
53 unsigned long refcount;
58 extern int pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *);
59 extern void pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *);
61 struct pnfs_layout_segment *
62 pnfs_update_layout(struct inode *ino, struct nfs_open_context *ctx,
63 enum pnfs_iomode access_type);
64 void set_pnfs_layoutdriver(struct nfs_server *, u32 id);
65 void unset_pnfs_layoutdriver(struct nfs_server *);
66 void pnfs_destroy_layout(struct nfs_inode *);
69 static inline int lo_fail_bit(u32 iomode)
71 return iomode == IOMODE_RW ?
72 NFS_LAYOUT_RW_FAILED : NFS_LAYOUT_RO_FAILED;
75 /* Return true if a layout driver is being used for this mountpoint */
76 static inline int pnfs_enabled_sb(struct nfs_server *nfss)
78 return nfss->pnfs_curr_ld != NULL;
81 #else /* CONFIG_NFS_V4_1 */
83 static inline void pnfs_destroy_layout(struct nfs_inode *nfsi)
87 static inline struct pnfs_layout_segment *
88 pnfs_update_layout(struct inode *ino, struct nfs_open_context *ctx,
89 enum pnfs_iomode access_type)
94 static inline void set_pnfs_layoutdriver(struct nfs_server *s, u32 id)
98 static inline void unset_pnfs_layoutdriver(struct nfs_server *s)
102 #endif /* CONFIG_NFS_V4_1 */
104 #endif /* FS_NFS_PNFS_H */