fs/nfs/flexfilelayout/flexfilelayout.h

   1 /*
   2  * NFSv4 flexfile layout driver data structures.
   3  *
   4  * Copyright (c) 2014, Primary Data, Inc. All rights reserved.
   5  *
   6  * Tao Peng <bergwolf@primarydata.com>
   7  */
   8
   9 #ifndef FS_NFS_NFS4FLEXFILELAYOUT_H
  10 #define FS_NFS_NFS4FLEXFILELAYOUT_H
  11
  12 #include "../pnfs.h"
  13
  14 /* XXX: Let's filter out insanely large mirror count for now to avoid oom
  15  * due to network error etc. */
  16 #define NFS4_FLEXFILE_LAYOUT_MAX_MIRROR_CNT 4096
  17
  18 struct nfs4_ff_ds_version {
  19         u32                             version;
  20         u32                             minor_version;
  21         u32                             rsize;
  22         u32                             wsize;
  23         bool                            tightly_coupled;
  24 };
  25
  26 /* chained in global deviceid hlist */
  27 struct nfs4_ff_layout_ds {
  28         struct nfs4_deviceid_node       id_node;
  29         u32                             ds_versions_cnt;
  30         struct nfs4_ff_ds_version       *ds_versions;
  31         struct nfs4_pnfs_ds             *ds;
  32 };
  33
  34 struct nfs4_ff_layout_ds_err {
  35         struct list_head                list; /* linked in mirror error_list */
  36         u64                             offset;
  37         u64                             length;
  38         int                             status;
  39         enum nfs_opnum4                 opnum;
  40         nfs4_stateid                    stateid;
  41         struct nfs4_deviceid            deviceid;
  42 };
  43
  44 struct nfs4_ff_layout_mirror {
  45         u32                             ds_count;
  46         u32                             efficiency;
  47         struct nfs4_ff_layout_ds        *mirror_ds;
  48         u32                             fh_versions_cnt;
  49         struct nfs_fh                   *fh_versions;
  50         nfs4_stateid                    stateid;
  51         u32                             uid;
  52         u32                             gid;
  53         struct rpc_cred                 *cred;
  54         spinlock_t                      lock;
  55 };
  56
  57 struct nfs4_ff_layout_segment {
  58         struct pnfs_layout_segment      generic_hdr;
  59         u64                             stripe_unit;
  60         u32                             mirror_array_cnt;
  61         struct nfs4_ff_layout_mirror    **mirror_array;
  62 };
  63
  64 struct nfs4_flexfile_layout {
  65         struct pnfs_layout_hdr generic_hdr;
  66         struct pnfs_ds_commit_info commit_info;
  67         struct list_head        error_list; /* nfs4_ff_layout_ds_err */
  68 };
  69
  70 static inline struct nfs4_flexfile_layout *
  71 FF_LAYOUT_FROM_HDR(struct pnfs_layout_hdr *lo)
  72 {
  73         return container_of(lo, struct nfs4_flexfile_layout, generic_hdr);
  74 }
  75
  76 static inline struct nfs4_ff_layout_segment *
  77 FF_LAYOUT_LSEG(struct pnfs_layout_segment *lseg)
  78 {
  79         return container_of(lseg,
  80                             struct nfs4_ff_layout_segment,
  81                             generic_hdr);
  82 }
  83
  84 static inline struct nfs4_deviceid_node *
  85 FF_LAYOUT_DEVID_NODE(struct pnfs_layout_segment *lseg, u32 idx)
  86 {
  87         if (idx >= FF_LAYOUT_LSEG(lseg)->mirror_array_cnt ||
  88             FF_LAYOUT_LSEG(lseg)->mirror_array[idx] == NULL ||
  89             FF_LAYOUT_LSEG(lseg)->mirror_array[idx]->mirror_ds == NULL)
  90                 return NULL;
  91         return &FF_LAYOUT_LSEG(lseg)->mirror_array[idx]->mirror_ds->id_node;
  92 }
  93
  94 static inline struct nfs4_ff_layout_ds *
  95 FF_LAYOUT_MIRROR_DS(struct nfs4_deviceid_node *node)
  96 {
  97         return container_of(node, struct nfs4_ff_layout_ds, id_node);
  98 }
  99
 100 static inline struct nfs4_ff_layout_mirror *
 101 FF_LAYOUT_COMP(struct pnfs_layout_segment *lseg, u32 idx)
 102 {
 103         if (idx >= FF_LAYOUT_LSEG(lseg)->mirror_array_cnt)
 104                 return NULL;
 105         return FF_LAYOUT_LSEG(lseg)->mirror_array[idx];
 106 }
 107
 108 static inline u32
 109 FF_LAYOUT_MIRROR_COUNT(struct pnfs_layout_segment *lseg)
 110 {
 111         return FF_LAYOUT_LSEG(lseg)->mirror_array_cnt;
 112 }
 113
 114 static inline bool
 115 ff_layout_test_devid_unavailable(struct nfs4_deviceid_node *node)
 116 {
 117         return nfs4_test_deviceid_unavailable(node);
 118 }
 119
 120 static inline int
 121 nfs4_ff_layout_ds_version(struct pnfs_layout_segment *lseg, u32 ds_idx)
 122 {
 123         return FF_LAYOUT_COMP(lseg, ds_idx)->mirror_ds->ds_versions[0].version;
 124 }
 125
 126 struct nfs4_ff_layout_ds *
 127 nfs4_ff_alloc_deviceid_node(struct nfs_server *server, struct pnfs_device *pdev,
 128                             gfp_t gfp_flags);
 129 void nfs4_ff_layout_put_deviceid(struct nfs4_ff_layout_ds *mirror_ds);
 130 void nfs4_ff_layout_free_deviceid(struct nfs4_ff_layout_ds *mirror_ds);
 131 int ff_layout_track_ds_error(struct nfs4_flexfile_layout *flo,
 132                              struct nfs4_ff_layout_mirror *mirror, u64 offset,
 133                              u64 length, int status, enum nfs_opnum4 opnum,
 134                              gfp_t gfp_flags);
 135 int ff_layout_encode_ds_ioerr(struct nfs4_flexfile_layout *flo,
 136                               struct xdr_stream *xdr, int *count,
 137                               const struct pnfs_layout_range *range);
 138 struct nfs_fh *
 139 nfs4_ff_layout_select_ds_fh(struct pnfs_layout_segment *lseg, u32 mirror_idx);
 140
 141 struct nfs4_pnfs_ds *
 142 nfs4_ff_layout_prepare_ds(struct pnfs_layout_segment *lseg, u32 ds_idx,
 143                           bool fail_return);
 144
 145 struct rpc_clnt *
 146 nfs4_ff_find_or_create_ds_client(struct pnfs_layout_segment *lseg,
 147                                  u32 ds_idx,
 148                                  struct nfs_client *ds_clp,
 149                                  struct inode *inode);
 150 struct rpc_cred *ff_layout_get_ds_cred(struct pnfs_layout_segment *lseg,
 151                                        u32 ds_idx, struct rpc_cred *mdscred);
 152 bool ff_layout_has_available_ds(struct pnfs_layout_segment *lseg);
 153 #endif /* FS_NFS_NFS4FLEXFILELAYOUT_H */