kernel/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 #define FF_FLAGS_NO_LAYOUTCOMMIT 1
  13 #define FF_FLAGS_NO_IO_THRU_MDS 2
  14
  15 #include "../pnfs.h"
  16
  17 /* XXX: Let's filter out insanely large mirror count for now to avoid oom
  18  * due to network error etc. */
  19 #define NFS4_FLEXFILE_LAYOUT_MAX_MIRROR_CNT 4096
  20
  21 /* LAYOUTSTATS report interval in ms */
  22 #define FF_LAYOUTSTATS_REPORT_INTERVAL (60000L)
  23
  24 struct nfs4_ff_ds_version {
  25         u32                             version;
  26         u32                             minor_version;
  27         u32                             rsize;
  28         u32                             wsize;
  29         bool                            tightly_coupled;
  30 };
  31
  32 /* chained in global deviceid hlist */
  33 struct nfs4_ff_layout_ds {
  34         struct nfs4_deviceid_node       id_node;
  35         u32                             ds_versions_cnt;
  36         struct nfs4_ff_ds_version       *ds_versions;
  37         struct nfs4_pnfs_ds             *ds;
  38 };
  39
  40 struct nfs4_ff_layout_ds_err {
  41         struct list_head                list; /* linked in mirror error_list */
  42         u64                             offset;
  43         u64                             length;
  44         int                             status;
  45         enum nfs_opnum4                 opnum;
  46         nfs4_stateid                    stateid;
  47         struct nfs4_deviceid            deviceid;
  48 };
  49
  50 struct nfs4_ff_io_stat {
  51         __u64                           ops_requested;
  52         __u64                           bytes_requested;
  53         __u64                           ops_completed;
  54         __u64                           bytes_completed;
  55         __u64                           bytes_not_delivered;
  56         ktime_t                         total_busy_time;
  57         ktime_t                         aggregate_completion_time;
  58 };
  59
  60 struct nfs4_ff_busy_timer {
  61         ktime_t start_time;
  62         atomic_t n_ops;
  63 };
  64
  65 struct nfs4_ff_layoutstat {
  66         struct nfs4_ff_io_stat io_stat;
  67         struct nfs4_ff_busy_timer busy_timer;
  68 };
  69
  70 struct nfs4_ff_layout_mirror {
  71         struct pnfs_layout_hdr          *layout;
  72         struct list_head                mirrors;
  73         u32                             ds_count;
  74         u32                             efficiency;
  75         struct nfs4_ff_layout_ds        *mirror_ds;
  76         u32                             fh_versions_cnt;
  77         struct nfs_fh                   *fh_versions;
  78         nfs4_stateid                    stateid;
  79         u32                             uid;
  80         u32                             gid;
  81         struct rpc_cred                 *cred;
  82         atomic_t                        ref;
  83         spinlock_t                      lock;
  84         struct nfs4_ff_layoutstat       read_stat;
  85         struct nfs4_ff_layoutstat       write_stat;
  86         ktime_t                         start_time;
  87         ktime_t                         last_report_time;
  88 };
  89
  90 struct nfs4_ff_layout_segment {
  91         struct pnfs_layout_segment      generic_hdr;
  92         u64                             stripe_unit;
  93         u32                             flags;
  94         u32                             mirror_array_cnt;
  95         struct nfs4_ff_layout_mirror    **mirror_array;
  96 };
  97
  98 struct nfs4_flexfile_layout {
  99         struct pnfs_layout_hdr generic_hdr;
 100         struct pnfs_ds_commit_info commit_info;
 101         struct list_head        mirrors;
 102         struct list_head        error_list; /* nfs4_ff_layout_ds_err */
 103 };
 104
 105 static inline struct nfs4_flexfile_layout *
 106 FF_LAYOUT_FROM_HDR(struct pnfs_layout_hdr *lo)
 107 {
 108         return container_of(lo, struct nfs4_flexfile_layout, generic_hdr);
 109 }
 110
 111 static inline struct nfs4_ff_layout_segment *
 112 FF_LAYOUT_LSEG(struct pnfs_layout_segment *lseg)
 113 {
 114         return container_of(lseg,
 115                             struct nfs4_ff_layout_segment,
 116                             generic_hdr);
 117 }
 118
 119 static inline struct nfs4_deviceid_node *
 120 FF_LAYOUT_DEVID_NODE(struct pnfs_layout_segment *lseg, u32 idx)
 121 {
 122         if (idx >= FF_LAYOUT_LSEG(lseg)->mirror_array_cnt ||
 123             FF_LAYOUT_LSEG(lseg)->mirror_array[idx] == NULL ||
 124             FF_LAYOUT_LSEG(lseg)->mirror_array[idx]->mirror_ds == NULL)
 125                 return NULL;
 126         return &FF_LAYOUT_LSEG(lseg)->mirror_array[idx]->mirror_ds->id_node;
 127 }
 128
 129 static inline struct nfs4_ff_layout_ds *
 130 FF_LAYOUT_MIRROR_DS(struct nfs4_deviceid_node *node)
 131 {
 132         return container_of(node, struct nfs4_ff_layout_ds, id_node);
 133 }
 134
 135 static inline struct nfs4_ff_layout_mirror *
 136 FF_LAYOUT_COMP(struct pnfs_layout_segment *lseg, u32 idx)
 137 {
 138         if (idx >= FF_LAYOUT_LSEG(lseg)->mirror_array_cnt)
 139                 return NULL;
 140         return FF_LAYOUT_LSEG(lseg)->mirror_array[idx];
 141 }
 142
 143 static inline u32
 144 FF_LAYOUT_MIRROR_COUNT(struct pnfs_layout_segment *lseg)
 145 {
 146         return FF_LAYOUT_LSEG(lseg)->mirror_array_cnt;
 147 }
 148
 149 static inline bool
 150 ff_layout_no_fallback_to_mds(struct pnfs_layout_segment *lseg)
 151 {
 152         return FF_LAYOUT_LSEG(lseg)->flags & FF_FLAGS_NO_IO_THRU_MDS;
 153 }
 154
 155 static inline bool
 156 ff_layout_test_devid_unavailable(struct nfs4_deviceid_node *node)
 157 {
 158         return nfs4_test_deviceid_unavailable(node);
 159 }
 160
 161 static inline int
 162 nfs4_ff_layout_ds_version(struct pnfs_layout_segment *lseg, u32 ds_idx)
 163 {
 164         return FF_LAYOUT_COMP(lseg, ds_idx)->mirror_ds->ds_versions[0].version;
 165 }
 166
 167 struct nfs4_ff_layout_ds *
 168 nfs4_ff_alloc_deviceid_node(struct nfs_server *server, struct pnfs_device *pdev,
 169                             gfp_t gfp_flags);
 170 void nfs4_ff_layout_put_deviceid(struct nfs4_ff_layout_ds *mirror_ds);
 171 void nfs4_ff_layout_free_deviceid(struct nfs4_ff_layout_ds *mirror_ds);
 172 int ff_layout_track_ds_error(struct nfs4_flexfile_layout *flo,
 173                              struct nfs4_ff_layout_mirror *mirror, u64 offset,
 174                              u64 length, int status, enum nfs_opnum4 opnum,
 175                              gfp_t gfp_flags);
 176 int ff_layout_encode_ds_ioerr(struct nfs4_flexfile_layout *flo,
 177                               struct xdr_stream *xdr, int *count,
 178                               const struct pnfs_layout_range *range);
 179 struct nfs_fh *
 180 nfs4_ff_layout_select_ds_fh(struct pnfs_layout_segment *lseg, u32 mirror_idx);
 181
 182 struct nfs4_pnfs_ds *
 183 nfs4_ff_layout_prepare_ds(struct pnfs_layout_segment *lseg, u32 ds_idx,
 184                           bool fail_return);
 185
 186 struct rpc_clnt *
 187 nfs4_ff_find_or_create_ds_client(struct pnfs_layout_segment *lseg,
 188                                  u32 ds_idx,
 189                                  struct nfs_client *ds_clp,
 190                                  struct inode *inode);
 191 struct rpc_cred *ff_layout_get_ds_cred(struct pnfs_layout_segment *lseg,
 192                                        u32 ds_idx, struct rpc_cred *mdscred);
 193 bool ff_layout_has_available_ds(struct pnfs_layout_segment *lseg);
 194 #endif /* FS_NFS_NFS4FLEXFILELAYOUT_H */