/*
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* NFSv4 file layout driver data structures.
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*
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* Copyright (c) 2002
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* The Regents of the University of Michigan
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* All Rights Reserved
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*
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* Dean Hildebrand <dhildebz@umich.edu>
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*
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* Permission is granted to use, copy, create derivative works, and
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* redistribute this software and such derivative works for any purpose,
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* so long as the name of the University of Michigan is not used in
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* any advertising or publicity pertaining to the use or distribution
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* of this software without specific, written prior authorization. If
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* the above copyright notice or any other identification of the
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* University of Michigan is included in any copy of any portion of
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* this software, then the disclaimer below must also be included.
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*
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* This software is provided as is, without representation or warranty
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* of any kind either express or implied, including without limitation
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* the implied warranties of merchantability, fitness for a particular
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* purpose, or noninfringement. The Regents of the University of
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* Michigan shall not be liable for any damages, including special,
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* indirect, incidental, or consequential damages, with respect to any
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* claim arising out of or in connection with the use of the software,
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* even if it has been or is hereafter advised of the possibility of
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* such damages.
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*/
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#ifndef FS_NFS_NFS4FILELAYOUT_H
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#define FS_NFS_NFS4FILELAYOUT_H
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#include "../pnfs.h"
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/*
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* Field testing shows we need to support up to 4096 stripe indices.
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* We store each index as a u8 (u32 on the wire) to keep the memory footprint
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* reasonable. This in turn means we support a maximum of 256
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* RFC 5661 multipath_list4 structures.
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*/
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#define NFS4_PNFS_MAX_STRIPE_CNT 4096
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#define NFS4_PNFS_MAX_MULTI_CNT 256 /* 256 fit into a u8 stripe_index */
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enum stripetype4 {
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STRIPE_SPARSE = 1,
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STRIPE_DENSE = 2
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};
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struct nfs4_file_layout_dsaddr {
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struct nfs4_deviceid_node id_node;
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u32 stripe_count;
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u8 *stripe_indices;
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u32 ds_num;
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struct nfs4_pnfs_ds *ds_list[1];
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};
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struct nfs4_filelayout_segment {
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struct pnfs_layout_segment generic_hdr;
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u32 stripe_type;
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u32 commit_through_mds;
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u32 stripe_unit;
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u32 first_stripe_index;
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u64 pattern_offset;
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struct nfs4_deviceid deviceid;
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struct nfs4_file_layout_dsaddr *dsaddr; /* Point to GETDEVINFO data */
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unsigned int num_fh;
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struct nfs_fh **fh_array;
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};
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struct nfs4_filelayout {
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struct pnfs_layout_hdr generic_hdr;
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struct pnfs_ds_commit_info commit_info;
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};
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static inline struct nfs4_filelayout *
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FILELAYOUT_FROM_HDR(struct pnfs_layout_hdr *lo)
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{
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return container_of(lo, struct nfs4_filelayout, generic_hdr);
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}
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static inline struct nfs4_filelayout_segment *
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FILELAYOUT_LSEG(struct pnfs_layout_segment *lseg)
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{
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return container_of(lseg,
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struct nfs4_filelayout_segment,
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generic_hdr);
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}
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static inline struct nfs4_deviceid_node *
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FILELAYOUT_DEVID_NODE(struct pnfs_layout_segment *lseg)
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{
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return &FILELAYOUT_LSEG(lseg)->dsaddr->id_node;
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}
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static inline bool
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filelayout_test_devid_invalid(struct nfs4_deviceid_node *node)
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{
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return test_bit(NFS_DEVICEID_INVALID, &node->flags);
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}
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extern bool
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filelayout_test_devid_unavailable(struct nfs4_deviceid_node *node);
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extern struct nfs_fh *
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nfs4_fl_select_ds_fh(struct pnfs_layout_segment *lseg, u32 j);
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u32 nfs4_fl_calc_j_index(struct pnfs_layout_segment *lseg, loff_t offset);
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u32 nfs4_fl_calc_ds_index(struct pnfs_layout_segment *lseg, u32 j);
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struct nfs4_pnfs_ds *nfs4_fl_prepare_ds(struct pnfs_layout_segment *lseg,
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u32 ds_idx);
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extern struct nfs4_file_layout_dsaddr *
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nfs4_fl_alloc_deviceid_node(struct nfs_server *server,
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struct pnfs_device *pdev, gfp_t gfp_flags);
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extern void nfs4_fl_put_deviceid(struct nfs4_file_layout_dsaddr *dsaddr);
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extern void nfs4_fl_free_deviceid(struct nfs4_file_layout_dsaddr *dsaddr);
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#endif /* FS_NFS_NFS4FILELAYOUT_H */
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