| /* |
| * pNFS client data structures. |
| * |
| * Copyright (c) 2002 |
| * The Regents of the University of Michigan |
| * All Rights Reserved |
| * |
| * Dean Hildebrand <dhildebz@umich.edu> |
| * |
| * Permission is granted to use, copy, create derivative works, and |
| * redistribute this software and such derivative works for any purpose, |
| * so long as the name of the University of Michigan is not used in |
| * any advertising or publicity pertaining to the use or distribution |
| * of this software without specific, written prior authorization. If |
| * the above copyright notice or any other identification of the |
| * University of Michigan is included in any copy of any portion of |
| * this software, then the disclaimer below must also be included. |
| * |
| * This software is provided as is, without representation or warranty |
| * of any kind either express or implied, including without limitation |
| * the implied warranties of merchantability, fitness for a particular |
| * purpose, or noninfringement. The Regents of the University of |
| * Michigan shall not be liable for any damages, including special, |
| * indirect, incidental, or consequential damages, with respect to any |
| * claim arising out of or in connection with the use of the software, |
| * even if it has been or is hereafter advised of the possibility of |
| * such damages. |
| */ |
| |
| #ifndef FS_NFS_PNFS_H |
| #define FS_NFS_PNFS_H |
| |
| #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; |
| const u32 id; |
| const char *name; |
| struct module *owner; |
| int (*initialize_mountpoint) (struct nfs_server *); |
| int (*uninitialize_mountpoint) (struct nfs_server *); |
| }; |
| |
| struct pnfs_layout_hdr { |
| unsigned long refcount; |
| 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 *); |
| |
| |
| 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_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) |
| { |
| } |
| |
| static inline void unset_pnfs_layoutdriver(struct nfs_server *s) |
| { |
| } |
| |
| #endif /* CONFIG_NFS_V4_1 */ |
| |
| #endif /* FS_NFS_PNFS_H */ |