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 #define FF_FLAGS_NO_READ_IO 4 15 16 #include "../pnfs.h" 17 18 /* XXX: Let's filter out insanely large mirror count for now to avoid oom 19 * due to network error etc. */ 20 #define NFS4_FLEXFILE_LAYOUT_MAX_MIRROR_CNT 4096 21 22 /* LAYOUTSTATS report interval in ms */ 23 #define FF_LAYOUTSTATS_REPORT_INTERVAL (60000L) 24 25 struct nfs4_ff_ds_version { 26 u32 version; 27 u32 minor_version; 28 u32 rsize; 29 u32 wsize; 30 bool tightly_coupled; 31 }; 32 33 /* chained in global deviceid hlist */ 34 struct nfs4_ff_layout_ds { 35 struct nfs4_deviceid_node id_node; 36 u32 ds_versions_cnt; 37 struct nfs4_ff_ds_version *ds_versions; 38 struct nfs4_pnfs_ds *ds; 39 }; 40 41 struct nfs4_ff_layout_ds_err { 42 struct list_head list; /* linked in mirror error_list */ 43 u64 offset; 44 u64 length; 45 int status; 46 enum nfs_opnum4 opnum; 47 nfs4_stateid stateid; 48 struct nfs4_deviceid deviceid; 49 }; 50 51 struct nfs4_ff_io_stat { 52 __u64 ops_requested; 53 __u64 bytes_requested; 54 __u64 ops_completed; 55 __u64 bytes_completed; 56 __u64 bytes_not_delivered; 57 ktime_t total_busy_time; 58 ktime_t aggregate_completion_time; 59 }; 60 61 struct nfs4_ff_busy_timer { 62 ktime_t start_time; 63 atomic_t n_ops; 64 }; 65 66 struct nfs4_ff_layoutstat { 67 struct nfs4_ff_io_stat io_stat; 68 struct nfs4_ff_busy_timer busy_timer; 69 }; 70 71 struct nfs4_ff_layout_mirror { 72 struct pnfs_layout_hdr *layout; 73 struct list_head mirrors; 74 u32 ds_count; 75 u32 efficiency; 76 struct nfs4_ff_layout_ds *mirror_ds; 77 u32 fh_versions_cnt; 78 struct nfs_fh *fh_versions; 79 nfs4_stateid stateid; 80 struct rpc_cred __rcu *ro_cred; 81 struct rpc_cred __rcu *rw_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 u32 report_interval; 89 }; 90 91 struct nfs4_ff_layout_segment { 92 struct pnfs_layout_segment generic_hdr; 93 u64 stripe_unit; 94 u32 flags; 95 u32 mirror_array_cnt; 96 struct nfs4_ff_layout_mirror **mirror_array; 97 }; 98 99 struct nfs4_flexfile_layout { 100 struct pnfs_layout_hdr generic_hdr; 101 struct pnfs_ds_commit_info commit_info; 102 struct list_head mirrors; 103 struct list_head error_list; /* nfs4_ff_layout_ds_err */ 104 }; 105 106 static inline struct nfs4_flexfile_layout * 107 FF_LAYOUT_FROM_HDR(struct pnfs_layout_hdr *lo) 108 { 109 return container_of(lo, struct nfs4_flexfile_layout, generic_hdr); 110 } 111 112 static inline struct nfs4_ff_layout_segment * 113 FF_LAYOUT_LSEG(struct pnfs_layout_segment *lseg) 114 { 115 return container_of(lseg, 116 struct nfs4_ff_layout_segment, 117 generic_hdr); 118 } 119 120 static inline struct nfs4_deviceid_node * 121 FF_LAYOUT_DEVID_NODE(struct pnfs_layout_segment *lseg, u32 idx) 122 { 123 if (idx >= FF_LAYOUT_LSEG(lseg)->mirror_array_cnt || 124 FF_LAYOUT_LSEG(lseg)->mirror_array[idx] == NULL || 125 FF_LAYOUT_LSEG(lseg)->mirror_array[idx]->mirror_ds == NULL) 126 return NULL; 127 return &FF_LAYOUT_LSEG(lseg)->mirror_array[idx]->mirror_ds->id_node; 128 } 129 130 static inline struct nfs4_ff_layout_ds * 131 FF_LAYOUT_MIRROR_DS(struct nfs4_deviceid_node *node) 132 { 133 return container_of(node, struct nfs4_ff_layout_ds, id_node); 134 } 135 136 static inline struct nfs4_ff_layout_mirror * 137 FF_LAYOUT_COMP(struct pnfs_layout_segment *lseg, u32 idx) 138 { 139 if (idx >= FF_LAYOUT_LSEG(lseg)->mirror_array_cnt) 140 return NULL; 141 return FF_LAYOUT_LSEG(lseg)->mirror_array[idx]; 142 } 143 144 static inline u32 145 FF_LAYOUT_MIRROR_COUNT(struct pnfs_layout_segment *lseg) 146 { 147 return FF_LAYOUT_LSEG(lseg)->mirror_array_cnt; 148 } 149 150 static inline bool 151 ff_layout_no_fallback_to_mds(struct pnfs_layout_segment *lseg) 152 { 153 return FF_LAYOUT_LSEG(lseg)->flags & FF_FLAGS_NO_IO_THRU_MDS; 154 } 155 156 static inline bool 157 ff_layout_no_read_on_rw(struct pnfs_layout_segment *lseg) 158 { 159 return FF_LAYOUT_LSEG(lseg)->flags & FF_FLAGS_NO_READ_IO; 160 } 161 162 static inline bool 163 ff_layout_test_devid_unavailable(struct nfs4_deviceid_node *node) 164 { 165 return nfs4_test_deviceid_unavailable(node); 166 } 167 168 static inline int 169 nfs4_ff_layout_ds_version(struct pnfs_layout_segment *lseg, u32 ds_idx) 170 { 171 return FF_LAYOUT_COMP(lseg, ds_idx)->mirror_ds->ds_versions[0].version; 172 } 173 174 struct nfs4_ff_layout_ds * 175 nfs4_ff_alloc_deviceid_node(struct nfs_server *server, struct pnfs_device *pdev, 176 gfp_t gfp_flags); 177 void nfs4_ff_layout_put_deviceid(struct nfs4_ff_layout_ds *mirror_ds); 178 void nfs4_ff_layout_free_deviceid(struct nfs4_ff_layout_ds *mirror_ds); 179 int ff_layout_track_ds_error(struct nfs4_flexfile_layout *flo, 180 struct nfs4_ff_layout_mirror *mirror, u64 offset, 181 u64 length, int status, enum nfs_opnum4 opnum, 182 gfp_t gfp_flags); 183 int ff_layout_encode_ds_ioerr(struct nfs4_flexfile_layout *flo, 184 struct xdr_stream *xdr, int *count, 185 const struct pnfs_layout_range *range); 186 struct nfs_fh * 187 nfs4_ff_layout_select_ds_fh(struct pnfs_layout_segment *lseg, u32 mirror_idx); 188 189 struct nfs4_pnfs_ds * 190 nfs4_ff_layout_prepare_ds(struct pnfs_layout_segment *lseg, u32 ds_idx, 191 bool fail_return); 192 193 struct rpc_clnt * 194 nfs4_ff_find_or_create_ds_client(struct pnfs_layout_segment *lseg, 195 u32 ds_idx, 196 struct nfs_client *ds_clp, 197 struct inode *inode); 198 struct rpc_cred *ff_layout_get_ds_cred(struct pnfs_layout_segment *lseg, 199 u32 ds_idx, struct rpc_cred *mdscred); 200 bool ff_layout_has_available_ds(struct pnfs_layout_segment *lseg); 201 bool ff_layout_avoid_mds_available_ds(struct pnfs_layout_segment *lseg); 202 bool ff_layout_avoid_read_on_rw(struct pnfs_layout_segment *lseg); 203 204 #endif /* FS_NFS_NFS4FLEXFILELAYOUT_H */ 205