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  * Default data server connection timeout and retrans vaules.
  37  * Set by module paramters dataserver_timeo and dataserver_retrans.
  38  */
  39 #define NFS4_DEF_DS_TIMEO   60
  40 #define NFS4_DEF_DS_RETRANS 5
  41
  42 /*
  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.
  47  */
  48 #define NFS4_PNFS_MAX_STRIPE_CNT 4096
  49 #define NFS4_PNFS_MAX_MULTI_CNT  256 /* 256 fit into a u8 stripe_index */
  50
  51 /* error codes for internal use */
  52 #define NFS4ERR_RESET_TO_MDS   12001
  53
  54 enum stripetype4 {
  55         STRIPE_SPARSE = 1,
  56         STRIPE_DENSE = 2
  57 };
  58
  59 /* Individual ip address */
  60 struct nfs4_pnfs_ds_addr {
  61         struct sockaddr_storage da_addr;
  62         size_t                  da_addrlen;
  63         struct list_head        da_node;  /* nfs4_pnfs_dev_hlist dev_dslist */
  64         char                    *da_remotestr;  /* human readable addr+port */
  65 };
  66
  67 struct nfs4_pnfs_ds {
  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;
  72         atomic_t                ds_count;
  73 };
  74
  75 struct nfs4_file_layout_dsaddr {
  76         struct nfs4_deviceid_node       id_node;
  77         u32                             stripe_count;
  78         u8                              *stripe_indices;
  79         u32                             ds_num;
  80         struct nfs4_pnfs_ds             *ds_list[1];
  81 };
  82
  83 struct nfs4_filelayout_segment {
  84         struct pnfs_layout_segment generic_hdr;
  85         u32 stripe_type;
  86         u32 commit_through_mds;
  87         u32 stripe_unit;
  88         u32 first_stripe_index;
  89         u64 pattern_offset;
  90         struct nfs4_file_layout_dsaddr *dsaddr; /* Point to GETDEVINFO data */
  91         unsigned int num_fh;
  92         struct nfs_fh **fh_array;
  93 };
  94
  95 struct nfs4_filelayout {
  96         struct pnfs_layout_hdr generic_hdr;
  97         struct pnfs_ds_commit_info commit_info;
  98 };
  99
 100 static inline struct nfs4_filelayout *
 101 FILELAYOUT_FROM_HDR(struct pnfs_layout_hdr *lo)
 102 {
 103         return container_of(lo, struct nfs4_filelayout, generic_hdr);
 104 }
 105
 106 static inline struct nfs4_filelayout_segment *
 107 FILELAYOUT_LSEG(struct pnfs_layout_segment *lseg)
 108 {
 109         return container_of(lseg,
 110                             struct nfs4_filelayout_segment,
 111                             generic_hdr);
 112 }
 113
 114 static inline struct nfs4_deviceid_node *
 115 FILELAYOUT_DEVID_NODE(struct pnfs_layout_segment *lseg)
 116 {
 117         return &FILELAYOUT_LSEG(lseg)->dsaddr->id_node;
 118 }
 119
 120 static inline void
 121 filelayout_mark_devid_invalid(struct nfs4_deviceid_node *node)
 122 {
 123         u32 *p = (u32 *)&node->deviceid;
 124
 125         printk(KERN_WARNING "NFS: Deviceid [%x%x%x%x] marked out of use.\n",
 126                 p[0], p[1], p[2], p[3]);
 127
 128         set_bit(NFS_DEVICEID_INVALID, &node->flags);
 129 }
 130
 131 static inline bool
 132 filelayout_test_layout_invalid(struct pnfs_layout_hdr *lo)
 133 {
 134         return test_bit(NFS_LAYOUT_INVALID, &lo->plh_flags);
 135 }
 136
 137 static inline bool
 138 filelayout_test_devid_invalid(struct nfs4_deviceid_node *node)
 139 {
 140         return test_bit(NFS_DEVICEID_INVALID, &node->flags);
 141 }
 142
 143 static inline bool
 144 filelayout_reset_to_mds(struct pnfs_layout_segment *lseg)
 145 {
 146         return filelayout_test_devid_invalid(FILELAYOUT_DEVID_NODE(lseg)) ||
 147                 filelayout_test_layout_invalid(lseg->pls_layout);
 148 }
 149
 150 extern struct nfs_fh *
 151 nfs4_fl_select_ds_fh(struct pnfs_layout_segment *lseg, u32 j);
 152
 153 extern void print_ds(struct nfs4_pnfs_ds *ds);
 154 u32 nfs4_fl_calc_j_index(struct pnfs_layout_segment *lseg, loff_t offset);
 155 u32 nfs4_fl_calc_ds_index(struct pnfs_layout_segment *lseg, u32 j);
 156 struct nfs4_pnfs_ds *nfs4_fl_prepare_ds(struct pnfs_layout_segment *lseg,
 157                                         u32 ds_idx);
 158 extern void nfs4_fl_put_deviceid(struct nfs4_file_layout_dsaddr *dsaddr);
 159 extern void nfs4_fl_free_deviceid(struct nfs4_file_layout_dsaddr *dsaddr);
 160 struct nfs4_file_layout_dsaddr *
 161 get_device_info(struct inode *inode, struct nfs4_deviceid *dev_id, gfp_t gfp_flags);
 162 void nfs4_ds_disconnect(struct nfs_client *clp);
 163
 164 #endif /* FS_NFS_NFS4FILELAYOUT_H */