2 * pNFS client data structures.
5 * The Regents of the University of Michigan
8 * Dean Hildebrand <dhildebz@umich.edu>
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33 struct pnfs_layout_segment {
34 struct list_head fi_list;
37 struct pnfs_layout_hdr *layout;
40 #ifdef CONFIG_NFS_V4_1
42 #define LAYOUT_NFSV4_1_MODULE_PREFIX "nfs-layouttype4"
45 NFS_LAYOUT_RO_FAILED = 0, /* get ro layout failed stop trying */
46 NFS_LAYOUT_RW_FAILED, /* get rw layout failed stop trying */
49 /* Per-layout driver specific registration structure */
50 struct pnfs_layoutdriver_type {
51 struct list_head pnfs_tblid;
55 int (*initialize_mountpoint) (struct nfs_server *);
56 int (*uninitialize_mountpoint) (struct nfs_server *);
59 struct pnfs_layout_hdr {
60 unsigned long refcount;
61 struct list_head layouts; /* other client layouts */
62 struct list_head segs; /* layout segments list */
67 extern int pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *);
68 extern void pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *);
70 struct pnfs_layout_segment *
71 pnfs_update_layout(struct inode *ino, struct nfs_open_context *ctx,
72 enum pnfs_iomode access_type);
73 void set_pnfs_layoutdriver(struct nfs_server *, u32 id);
74 void unset_pnfs_layoutdriver(struct nfs_server *);
75 void pnfs_destroy_layout(struct nfs_inode *);
76 void pnfs_destroy_all_layouts(struct nfs_client *);
79 static inline int lo_fail_bit(u32 iomode)
81 return iomode == IOMODE_RW ?
82 NFS_LAYOUT_RW_FAILED : NFS_LAYOUT_RO_FAILED;
85 /* Return true if a layout driver is being used for this mountpoint */
86 static inline int pnfs_enabled_sb(struct nfs_server *nfss)
88 return nfss->pnfs_curr_ld != NULL;
91 #else /* CONFIG_NFS_V4_1 */
93 static inline void pnfs_destroy_all_layouts(struct nfs_client *clp)
97 static inline void pnfs_destroy_layout(struct nfs_inode *nfsi)
101 static inline struct pnfs_layout_segment *
102 pnfs_update_layout(struct inode *ino, struct nfs_open_context *ctx,
103 enum pnfs_iomode access_type)
108 static inline void set_pnfs_layoutdriver(struct nfs_server *s, u32 id)
112 static inline void unset_pnfs_layoutdriver(struct nfs_server *s)
116 #endif /* CONFIG_NFS_V4_1 */
118 #endif /* FS_NFS_PNFS_H */