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 * Default data server connection timeout and retrans vaules.
37 * Set by module paramters dataserver_timeo and dataserver_retrans.
39 #define NFS4_DEF_DS_TIMEO 600 /* in tenths of a second */
40 #define NFS4_DEF_DS_RETRANS 5
43 * Field testing shows we need to support up to 4096 stripe indices.
44 * We store each index as a u8 (u32 on the wire) to keep the memory footprint
45 * reasonable. This in turn means we support a maximum of 256
46 * RFC 5661 multipath_list4 structures.
48 #define NFS4_PNFS_MAX_STRIPE_CNT 4096
49 #define NFS4_PNFS_MAX_MULTI_CNT 256 /* 256 fit into a u8 stripe_index */
51 /* error codes for internal use */
52 #define NFS4ERR_RESET_TO_MDS 12001
59 /* Individual ip address */
60 struct nfs4_pnfs_ds_addr {
61 struct sockaddr_storage da_addr;
63 struct list_head da_node; /* nfs4_pnfs_dev_hlist dev_dslist */
64 char *da_remotestr; /* human readable addr+port */
68 struct list_head ds_node; /* nfs4_pnfs_dev_hlist dev_dslist */
69 char *ds_remotestr; /* comma sep list of addrs */
70 struct list_head ds_addrs;
71 struct nfs_client *ds_clp;
75 struct nfs4_file_layout_dsaddr {
76 struct nfs4_deviceid_node id_node;
80 struct nfs4_pnfs_ds *ds_list[1];
83 struct nfs4_filelayout_segment {
84 struct pnfs_layout_segment generic_hdr;
86 u32 commit_through_mds;
88 u32 first_stripe_index;
90 struct nfs4_file_layout_dsaddr *dsaddr; /* Point to GETDEVINFO data */
92 struct nfs_fh **fh_array;
95 struct nfs4_filelayout {
96 struct pnfs_layout_hdr generic_hdr;
97 struct pnfs_ds_commit_info commit_info;
100 static inline struct nfs4_filelayout *
101 FILELAYOUT_FROM_HDR(struct pnfs_layout_hdr *lo)
103 return container_of(lo, struct nfs4_filelayout, generic_hdr);
106 static inline struct nfs4_filelayout_segment *
107 FILELAYOUT_LSEG(struct pnfs_layout_segment *lseg)
109 return container_of(lseg,
110 struct nfs4_filelayout_segment,
114 static inline struct nfs4_deviceid_node *
115 FILELAYOUT_DEVID_NODE(struct pnfs_layout_segment *lseg)
117 return &FILELAYOUT_LSEG(lseg)->dsaddr->id_node;
121 filelayout_mark_devid_invalid(struct nfs4_deviceid_node *node)
123 u32 *p = (u32 *)&node->deviceid;
125 printk(KERN_WARNING "NFS: Deviceid [%x%x%x%x] marked out of use.\n",
126 p[0], p[1], p[2], p[3]);
128 set_bit(NFS_DEVICEID_INVALID, &node->flags);
132 filelayout_test_devid_invalid(struct nfs4_deviceid_node *node)
134 return test_bit(NFS_DEVICEID_INVALID, &node->flags);
138 filelayout_test_devid_unavailable(struct nfs4_deviceid_node *node);
140 extern struct nfs_fh *
141 nfs4_fl_select_ds_fh(struct pnfs_layout_segment *lseg, u32 j);
143 extern void print_ds(struct nfs4_pnfs_ds *ds);
144 u32 nfs4_fl_calc_j_index(struct pnfs_layout_segment *lseg, loff_t offset);
145 u32 nfs4_fl_calc_ds_index(struct pnfs_layout_segment *lseg, u32 j);
146 struct nfs4_pnfs_ds *nfs4_fl_prepare_ds(struct pnfs_layout_segment *lseg,
148 extern void nfs4_fl_put_deviceid(struct nfs4_file_layout_dsaddr *dsaddr);
149 extern void nfs4_fl_free_deviceid(struct nfs4_file_layout_dsaddr *dsaddr);
150 struct nfs4_file_layout_dsaddr *
151 filelayout_get_device_info(struct inode *inode, struct nfs4_deviceid *dev_id, gfp_t gfp_flags);
153 #endif /* FS_NFS_NFS4FILELAYOUT_H */