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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12 * so long as the name of the University of Michigan is not used in
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14 * of this software without specific, written prior authorization. If
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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 */
51 struct list_head ds_node
; /* nfs4_pnfs_dev_hlist dev_dslist */
54 struct nfs_client
*ds_clp
;
58 /* nfs4_file_layout_dsaddr flags */
59 #define NFS4_DEVICE_ID_NEG_ENTRY 0x00000001
61 struct nfs4_file_layout_dsaddr
{
62 struct hlist_node node
;
63 struct nfs4_deviceid deviceid
;
69 struct nfs4_pnfs_ds
*ds_list
[1];
72 struct nfs4_filelayout_segment
{
73 struct pnfs_layout_segment generic_hdr
;
75 u32 commit_through_mds
;
77 u32 first_stripe_index
;
79 struct nfs4_file_layout_dsaddr
*dsaddr
; /* Point to GETDEVINFO data */
81 struct nfs_fh
**fh_array
;
82 struct list_head
*commit_buckets
; /* Sort commits to ds */
83 int number_of_buckets
;
86 static inline struct nfs4_filelayout_segment
*
87 FILELAYOUT_LSEG(struct pnfs_layout_segment
*lseg
)
89 return container_of(lseg
,
90 struct nfs4_filelayout_segment
,
94 extern struct nfs_fh
*
95 nfs4_fl_select_ds_fh(struct pnfs_layout_segment
*lseg
, u32 j
);
97 extern void print_ds(struct nfs4_pnfs_ds
*ds
);
98 extern void print_deviceid(struct nfs4_deviceid
*dev_id
);
99 u32
nfs4_fl_calc_j_index(struct pnfs_layout_segment
*lseg
, loff_t offset
);
100 u32
nfs4_fl_calc_ds_index(struct pnfs_layout_segment
*lseg
, u32 j
);
101 struct nfs4_pnfs_ds
*nfs4_fl_prepare_ds(struct pnfs_layout_segment
*lseg
,
103 extern struct nfs4_file_layout_dsaddr
*
104 nfs4_fl_find_get_deviceid(struct nfs4_deviceid
*dev_id
);
105 extern void nfs4_fl_put_deviceid(struct nfs4_file_layout_dsaddr
*dsaddr
);
106 struct nfs4_file_layout_dsaddr
*
107 get_device_info(struct inode
*inode
, struct nfs4_deviceid
*dev_id
);
109 #endif /* FS_NFS_NFS4FILELAYOUT_H */