2 * NFSv4 file layout driver data structures.
5 * The Regents of the University of Michigan
8 * Dean Hildebrand <dhildebz@umich.edu>
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30 #ifndef FS_NFS_NFS4FILELAYOUT_H
31 #define FS_NFS_NFS4FILELAYOUT_H
36 * Field testing shows we need to support up to 4096 stripe indices.
37 * We store each index as a u8 (u32 on the wire) to keep the memory footprint
38 * reasonable. This in turn means we support a maximum of 256
39 * RFC 5661 multipath_list4 structures.
41 #define NFS4_PNFS_MAX_STRIPE_CNT 4096
42 #define NFS4_PNFS_MAX_MULTI_CNT 256 /* 256 fit into a u8 stripe_index */
49 /* Individual ip address */
50 struct nfs4_pnfs_ds_addr {
51 struct sockaddr_storage da_addr;
53 struct list_head da_node; /* nfs4_pnfs_dev_hlist dev_dslist */
54 char *da_remotestr; /* human readable addr+port */
58 struct list_head ds_node; /* nfs4_pnfs_dev_hlist dev_dslist */
59 char *ds_remotestr; /* comma sep list of addrs */
60 struct list_head ds_addrs;
61 struct nfs_client *ds_clp;
65 /* nfs4_file_layout_dsaddr flags */
66 #define NFS4_DEVICE_ID_NEG_ENTRY 0x00000001
68 struct nfs4_file_layout_dsaddr {
69 struct nfs4_deviceid_node id_node;
74 struct nfs4_pnfs_ds *ds_list[1];
77 struct nfs4_filelayout_segment {
78 struct pnfs_layout_segment generic_hdr;
80 u32 commit_through_mds;
82 u32 first_stripe_index;
84 struct nfs4_file_layout_dsaddr *dsaddr; /* Point to GETDEVINFO data */
86 struct nfs_fh **fh_array;
87 struct list_head *commit_buckets; /* Sort commits to ds */
88 int number_of_buckets;
91 static inline struct nfs4_filelayout_segment *
92 FILELAYOUT_LSEG(struct pnfs_layout_segment *lseg)
94 return container_of(lseg,
95 struct nfs4_filelayout_segment,
99 static inline struct nfs4_deviceid_node *
100 FILELAYOUT_DEVID_NODE(struct pnfs_layout_segment *lseg)
102 return &FILELAYOUT_LSEG(lseg)->dsaddr->id_node;
105 extern struct nfs_fh *
106 nfs4_fl_select_ds_fh(struct pnfs_layout_segment *lseg, u32 j);
108 extern void print_ds(struct nfs4_pnfs_ds *ds);
109 u32 nfs4_fl_calc_j_index(struct pnfs_layout_segment *lseg, loff_t offset);
110 u32 nfs4_fl_calc_ds_index(struct pnfs_layout_segment *lseg, u32 j);
111 struct nfs4_pnfs_ds *nfs4_fl_prepare_ds(struct pnfs_layout_segment *lseg,
113 extern void nfs4_fl_put_deviceid(struct nfs4_file_layout_dsaddr *dsaddr);
114 extern void nfs4_fl_free_deviceid(struct nfs4_file_layout_dsaddr *dsaddr);
115 struct nfs4_file_layout_dsaddr *
116 get_device_info(struct inode *inode, struct nfs4_deviceid *dev_id, gfp_t gfp_flags);
118 #endif /* FS_NFS_NFS4FILELAYOUT_H */