fs/nfs/nfs4filelayout.h

   1 /*
   2  *  NFSv4 file layout driver data structures.
   3  *
   4  *  Copyright (c) 2002
   5  *  The Regents of the University of Michigan
   6  *  All Rights Reserved
   7  *
   8  *  Dean Hildebrand <dhildebz@umich.edu>
   9  *
  10  *  Permission is granted to use, copy, create derivative works, and
  11  *  redistribute this software and such derivative works for any purpose,
  12  *  so long as the name of the University of Michigan is not used in
  13  *  any advertising or publicity pertaining to the use or distribution
  14  *  of this software without specific, written prior authorization. If
  15  *  the above copyright notice or any other identification of the
  16  *  University of Michigan is included in any copy of any portion of
  17  *  this software, then the disclaimer below must also be included.
  18  *
  19  *  This software is provided as is, without representation or warranty
  20  *  of any kind either express or implied, including without limitation
  21  *  the implied warranties of merchantability, fitness for a particular
  22  *  purpose, or noninfringement.  The Regents of the University of
  23  *  Michigan shall not be liable for any damages, including special,
  24  *  indirect, incidental, or consequential damages, with respect to any
  25  *  claim arising out of or in connection with the use of the software,
  26  *  even if it has been or is hereafter advised of the possibility of
  27  *  such damages.
  28  */
  29
  30 #ifndef FS_NFS_NFS4FILELAYOUT_H
  31 #define FS_NFS_NFS4FILELAYOUT_H
  32
  33 #include "pnfs.h"
  34
  35 /*
  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.
  40  */
  41 #define NFS4_PNFS_MAX_STRIPE_CNT 4096
  42 #define NFS4_PNFS_MAX_MULTI_CNT  256 /* 256 fit into a u8 stripe_index */
  43
  44 enum stripetype4 {
  45         STRIPE_SPARSE = 1,
  46         STRIPE_DENSE = 2
  47 };
  48
  49 /* Individual ip address */
  50 struct nfs4_pnfs_ds_addr {
  51         struct sockaddr_storage da_addr;
  52         size_t                  da_addrlen;
  53         struct list_head        da_node;  /* nfs4_pnfs_dev_hlist dev_dslist */
  54         char                    *da_remotestr;  /* human readable addr+port */
  55 };
  56
  57 struct nfs4_pnfs_ds {
  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;
  62         atomic_t                ds_count;
  63 };
  64
  65 /* nfs4_file_layout_dsaddr flags */
  66 #define NFS4_DEVICE_ID_NEG_ENTRY        0x00000001
  67
  68 struct nfs4_file_layout_dsaddr {
  69         struct nfs4_deviceid_node       id_node;
  70         unsigned long                   flags;
  71         u32                             stripe_count;
  72         u8                              *stripe_indices;
  73         u32                             ds_num;
  74         struct nfs4_pnfs_ds             *ds_list[1];
  75 };
  76
  77 struct nfs4_fl_commit_bucket {
  78         struct list_head written;
  79         struct list_head committing;
  80 };
  81
  82 struct nfs4_filelayout_segment {
  83         struct pnfs_layout_segment generic_hdr;
  84         u32 stripe_type;
  85         u32 commit_through_mds;
  86         u32 stripe_unit;
  87         u32 first_stripe_index;
  88         u64 pattern_offset;
  89         struct nfs4_file_layout_dsaddr *dsaddr; /* Point to GETDEVINFO data */
  90         unsigned int num_fh;
  91         struct nfs_fh **fh_array;
  92         struct nfs4_fl_commit_bucket *commit_buckets; /* Sort commits to ds */
  93         int number_of_buckets;
  94 };
  95
  96 static inline struct nfs4_filelayout_segment *
  97 FILELAYOUT_LSEG(struct pnfs_layout_segment *lseg)
  98 {
  99         return container_of(lseg,
 100                             struct nfs4_filelayout_segment,
 101                             generic_hdr);
 102 }
 103
 104 static inline struct nfs4_deviceid_node *
 105 FILELAYOUT_DEVID_NODE(struct pnfs_layout_segment *lseg)
 106 {
 107         return &FILELAYOUT_LSEG(lseg)->dsaddr->id_node;
 108 }
 109
 110 extern struct nfs_fh *
 111 nfs4_fl_select_ds_fh(struct pnfs_layout_segment *lseg, u32 j);
 112
 113 extern void print_ds(struct nfs4_pnfs_ds *ds);
 114 u32 nfs4_fl_calc_j_index(struct pnfs_layout_segment *lseg, loff_t offset);
 115 u32 nfs4_fl_calc_ds_index(struct pnfs_layout_segment *lseg, u32 j);
 116 struct nfs4_pnfs_ds *nfs4_fl_prepare_ds(struct pnfs_layout_segment *lseg,
 117                                         u32 ds_idx);
 118 extern void nfs4_fl_put_deviceid(struct nfs4_file_layout_dsaddr *dsaddr);
 119 extern void nfs4_fl_free_deviceid(struct nfs4_file_layout_dsaddr *dsaddr);
 120 struct nfs4_file_layout_dsaddr *
 121 get_device_info(struct inode *inode, struct nfs4_deviceid *dev_id, gfp_t gfp_flags);
 122
 123 #endif /* FS_NFS_NFS4FILELAYOUT_H */